From: mchristi@redhat.com <mchristi@redhat.com>
Date: Tue, 28 Oct 2008 18:42:42 -0500
Subject: [scsi] add libfc and software fcoe driver
Message-id: 1225237363-4085-1-git-send-email-mchristi@redhat.com
O-Subject: [PATCH 1/2] RHEL 5.3: Add libfc and software fcoe driver
Bugzilla: 436051
RH-Acked-by: Tomas Henzl <thenzl@redhat.com>
From: Mike Christie <mchristi@redhat.com>
This is for BZ 43605.
FCoE is the ability to throw Fibre Channel exchanges/sequences over
ethernet. This patch adds libfc which is a library for fc discovery,
FCP (throwing SCSI commands over Fibre Channel) processing and other operations
like ELS (basically special passthrough commands). It also adds a
software fcoe driver which like ATA over ethernet converts it packets to/from
skbs and passes them to/from the network driver.
The SCSI and FC parts have been posted and reviewed a lot by the FC developers
(like emulex and qlogic guys) on linux-scsi and the fcoe list, and I think
it is close to upstream acceptance. The last major review comment is to remove
the dummy rport code and integrate that into the fc class and convert all
the fc drivers. We decided not to include that in the RHEL5 port, because
it is too disruptive to our fc class and drivers.
I tested with the Cisco 5000 switch/target by running disktest and dd and
some bonnie++ while unplugging cables.
diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig
index 766f648..2ed0e73 100644
--- a/drivers/scsi/Kconfig
+++ b/drivers/scsi/Kconfig
@@ -255,6 +255,19 @@ endmenu
menu "SCSI low-level drivers"
depends on SCSI!=n
+config LIBFC
+ tristate "LibFC module"
+ depends on SCSI && SCSI_FC_ATTRS
+ ---help---
+ Fibre Channel library module
+
+config FCOE
+ tristate "FCoE module"
+ depends on SCSI && SCSI_FC_ATTRS
+ select LIBFC
+ ---help---
+ Fibre Channel over Ethernet module
+
config ISCSI_TCP
tristate "iSCSI Initiator over TCP/IP"
depends on SCSI && INET
diff --git a/drivers/scsi/Makefile b/drivers/scsi/Makefile
index 7e0f83e..e14d084 100644
--- a/drivers/scsi/Makefile
+++ b/drivers/scsi/Makefile
@@ -35,6 +35,8 @@ obj-$(CONFIG_SCSI_SAS_ATTRS) += scsi_transport_sas.o
obj-$(CONFIG_SCSI_SAS_LIBSAS) += libsas/
obj-y += device_handler/
+obj-$(CONFIG_LIBFC) += libfc/
+obj-$(CONFIG_FCOE) += fcoe/
obj-$(CONFIG_ISCSI_TCP) += libiscsi.o iscsi_tcp.o
obj-$(CONFIG_INFINIBAND_ISER) += libiscsi.o
obj-$(CONFIG_SCSI_AMIGA7XX) += amiga7xx.o 53c7xx.o
diff --git a/drivers/scsi/fcoe/Makefile b/drivers/scsi/fcoe/Makefile
new file mode 100644
index 0000000..b78da06
--- /dev/null
+++ b/drivers/scsi/fcoe/Makefile
@@ -0,0 +1,8 @@
+# $Id: Makefile
+
+obj-$(CONFIG_FCOE) += fcoe.o
+
+fcoe-y := \
+ libfcoe.o \
+ fcoe_sw.o \
+ fc_transport_fcoe.o
diff --git a/drivers/scsi/fcoe/fc_transport_fcoe.c b/drivers/scsi/fcoe/fc_transport_fcoe.c
new file mode 100644
index 0000000..2ba9aa5
--- /dev/null
+++ b/drivers/scsi/fcoe/fc_transport_fcoe.c
@@ -0,0 +1,377 @@
+/*
+ * Copyright(c) 2007 - 2008 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Maintained at www.Open-FCoE.org
+ */
+
+#include <linux/module.h>
+#include <linux/version.h>
+#include <linux/kernel.h>
+#include <linux/kthread.h>
+#include <linux/spinlock.h>
+#include <linux/cpu.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/ethtool.h>
+#include <linux/if_ether.h>
+#include <linux/fs.h>
+#include <linux/sysfs.h>
+#include <linux/ctype.h>
+
+#include <scsi/libfc/libfc.h>
+
+#include "fcoe_def.h"
+
+MODULE_AUTHOR("Open-FCoE.org");
+MODULE_DESCRIPTION("FCoE");
+MODULE_LICENSE("GPL");
+
+/*
+ * Static functions and variables definations
+ */
+#ifdef CONFIG_HOTPLUG_CPU
+static int fcoe_cpu_callback(struct notifier_block *, ulong, void *);
+#endif /* CONFIG_HOTPLUG_CPU */
+static int fcoe_device_notification(struct notifier_block *, ulong, void *);
+static void fcoe_dev_setup(void);
+static void fcoe_dev_cleanup(void);
+
+#ifdef CONFIG_HOTPLUG_CPU
+static struct notifier_block fcoe_cpu_notifier = {
+ .notifier_call = fcoe_cpu_callback,
+};
+#endif /* CONFIG_HOTPLUG_CPU */
+
+/*
+ * notification function from net device
+ */
+static struct notifier_block fcoe_notifier = {
+ .notifier_call = fcoe_device_notification,
+};
+
+#ifdef CONFIG_HOTPLUG_CPU
+/*
+ * create percpu stats block
+ * called by cpu add/remove notifier
+ */
+static void fcoe_create_percpu_data(int cpu)
+{
+ struct fc_lport *lp;
+ struct fcoe_softc *fc;
+ struct fcoe_dev_stats *p;
+
+ write_lock_bh(&fcoe_hostlist_lock);
+ list_for_each_entry(fc, &fcoe_hostlist, list) {
+ lp = fc->lp;
+ if (lp->dev_stats[cpu] == NULL) {
+ p = kzalloc(sizeof(struct fcoe_dev_stats), GFP_KERNEL);
+ if (p)
+ lp->dev_stats[cpu] = p;
+ }
+ }
+ write_unlock_bh(&fcoe_hostlist_lock);
+}
+
+/*
+ * destroy percpu stats block
+ * called by cpu add/remove notifier
+ */
+static void fcoe_destroy_percpu_data(int cpu)
+{
+ struct fcoe_dev_stats *p;
+ struct fc_lport *lp;
+ struct fcoe_softc *fc;
+
+ write_lock_bh(&fcoe_hostlist_lock);
+ list_for_each_entry(fc, &fcoe_hostlist, list) {
+ lp = fc->lp;
+ p = lp->dev_stats[cpu];
+ if (p != NULL) {
+ lp->dev_stats[cpu] = NULL;
+ kfree(p);
+ }
+ }
+ write_unlock_bh(&fcoe_hostlist_lock);
+}
+
+/*
+ * Get notified when a cpu comes on/off. Be hotplug friendly.
+ */
+static int fcoe_cpu_callback(struct notifier_block *nfb, unsigned long action,
+ void *hcpu)
+{
+ unsigned int cpu = (unsigned long)hcpu;
+
+ switch (action) {
+ case CPU_ONLINE:
+ fcoe_create_percpu_data(cpu);
+ break;
+ case CPU_DEAD:
+ fcoe_destroy_percpu_data(cpu);
+ break;
+ default:
+ break;
+ }
+ return NOTIFY_OK;
+}
+#endif /* CONFIG_HOTPLUG_CPU */
+
+/*
+ * function to setup link change notification interface
+ */
+static void fcoe_dev_setup(void)
+{
+ /*
+ * here setup a interface specific wd time to
+ * monitor the link state
+ */
+ register_netdevice_notifier(&fcoe_notifier);
+}
+
+/*
+ * function to cleanup link change notification interface
+ */
+static void fcoe_dev_cleanup(void)
+{
+ unregister_netdevice_notifier(&fcoe_notifier);
+}
+
+/*
+ * This function is called by the ethernet driver
+ * this is called in case of link change event
+ */
+static int fcoe_device_notification(struct notifier_block *notifier,
+ ulong event, void *ptr)
+{
+ struct fc_lport *lp = NULL;
+ struct net_device *real_dev = ptr;
+ struct fcoe_softc *fc;
+ struct fcoe_dev_stats *stats;
+ u16 new_status;
+ u32 mfs;
+ int rc = NOTIFY_OK;
+
+ read_lock(&fcoe_hostlist_lock);
+ list_for_each_entry(fc, &fcoe_hostlist, list) {
+ if (fc->real_dev == real_dev) {
+ lp = fc->lp;
+ break;
+ }
+ }
+ read_unlock(&fcoe_hostlist_lock);
+ if (lp == NULL) {
+ rc = NOTIFY_DONE;
+ goto out;
+ }
+
+ new_status = lp->link_status;
+ switch (event) {
+ case NETDEV_DOWN:
+ case NETDEV_GOING_DOWN:
+ new_status &= ~FC_LINK_UP;
+ break;
+ case NETDEV_UP:
+ case NETDEV_CHANGE:
+ new_status &= ~FC_LINK_UP;
+ if (!fcoe_link_ok(lp))
+ new_status |= FC_LINK_UP;
+ break;
+ case NETDEV_CHANGEMTU:
+ mfs = fc->real_dev->mtu -
+ (sizeof(struct fcoe_hdr) +
+ sizeof(struct fcoe_crc_eof));
+ if (fc->user_mfs && fc->user_mfs < mfs)
+ mfs = fc->user_mfs;
+ if (mfs >= FC_MIN_MAX_FRAME)
+ fc_set_mfs(lp, mfs);
+ new_status &= ~FC_LINK_UP;
+ if (!fcoe_link_ok(lp))
+ new_status |= FC_LINK_UP;
+ break;
+ case NETDEV_REGISTER:
+ break;
+ default:
+ FC_DBG("unknown event %ld call", event);
+ }
+ if (lp->link_status != new_status) {
+ if ((new_status & FC_LINK_UP) == FC_LINK_UP)
+ fc_linkup(lp);
+ else {
+ stats = lp->dev_stats[smp_processor_id()];
+ stats->LinkFailureCount++;
+ fc_linkdown(lp);
+ fcoe_clean_pending_queue(lp);
+ }
+ }
+out:
+ return rc;
+}
+
+static void trimstr(char *str, int len)
+{
+ char *cp = str + len;
+ while (--cp >= str && *cp == '\n')
+ *cp = '\0';
+}
+
+static int fcoe_destroy(const char *buffer, struct kernel_param *kp)
+{
+ struct net_device *netdev;
+ char ifname[IFNAMSIZ + 2];
+ int rc = -ENODEV;
+
+ strlcpy(ifname, buffer, IFNAMSIZ);
+ trimstr(ifname, strlen(ifname));
+ netdev = dev_get_by_name(ifname);
+ if (netdev) {
+ rc = fcoe_destroy_interface(netdev);
+ dev_put(netdev);
+ }
+ return rc;
+}
+
+static int fcoe_create(const char *buffer, struct kernel_param *kp)
+{
+ struct net_device *netdev;
+ char ifname[IFNAMSIZ + 2];
+ int rc = -ENODEV;
+
+ strlcpy(ifname, buffer, IFNAMSIZ);
+ trimstr(ifname, strlen(ifname));
+ netdev = dev_get_by_name(ifname);
+ if (netdev) {
+ rc = fcoe_create_interface(netdev);
+ dev_put(netdev);
+ }
+ return rc;
+}
+
+module_param_call(create, fcoe_create, NULL, NULL, S_IWUSR);
+__MODULE_PARM_TYPE(create, "string");
+MODULE_PARM_DESC(create, "Create fcoe port using net device passed in.");
+module_param_call(destroy, fcoe_destroy, NULL, NULL, S_IWUSR);
+__MODULE_PARM_TYPE(destroy, "string");
+MODULE_PARM_DESC(destroy, "Destroy fcoe port");
+
+/*
+ * Initialization routine
+ * 1. Will create fc transport software structure
+ * 2. initialize the link list of port information structure
+ */
+static int __init fcoe_init(void)
+{
+ int cpu;
+ struct fcoe_percpu_s *p;
+
+ rwlock_init(&fcoe_hostlist_lock);
+
+#ifdef CONFIG_HOTPLUG_CPU
+ register_cpu_notifier(&fcoe_cpu_notifier);
+#endif /* CONFIG_HOTPLUG_CPU */
+
+ /*
+ * initialize per CPU interrupt thread
+ */
+ for_each_online_cpu(cpu) {
+ p = kzalloc(sizeof(struct fcoe_percpu_s), GFP_KERNEL);
+ if (p) {
+ p->thread = kthread_create(fcoe_percpu_receive_thread,
+ (void *)p,
+ "fcoethread/%d", cpu);
+
+ /*
+ * if there is no error then bind the thread to the cpu
+ * initialize the semaphore and skb queue head
+ */
+ if (likely(!IS_ERR(p->thread))) {
+ p->cpu = cpu;
+ fcoe_percpu[cpu] = p;
+ skb_queue_head_init(&p->fcoe_rx_list);
+ kthread_bind(p->thread, cpu);
+ wake_up_process(p->thread);
+ } else {
+ fcoe_percpu[cpu] = NULL;
+ kfree(p);
+
+ }
+ }
+ }
+
+ /*
+ * setup link change notification
+ */
+ fcoe_dev_setup();
+
+ init_timer(&fcoe_timer);
+ fcoe_timer.data = 0;
+ fcoe_timer.function = fcoe_watchdog;
+ fcoe_timer.expires = (jiffies + (10 * HZ));
+ add_timer(&fcoe_timer);
+
+ if (fcoe_sw_init() != 0) {
+ FC_DBG("fail to attach fc transport");
+ return -1;
+ }
+
+ return 0;
+}
+module_init(fcoe_init);
+
+static void __exit fcoe_exit(void)
+{
+ u32 idx;
+ struct fcoe_softc *fc, *tmp;
+ struct fcoe_percpu_s *p;
+ struct sk_buff *skb;
+
+ /*
+ * Stop all call back interfaces
+ */
+#ifdef CONFIG_HOTPLUG_CPU
+ unregister_cpu_notifier(&fcoe_cpu_notifier);
+#endif /* CONFIG_HOTPLUG_CPU */
+ fcoe_dev_cleanup();
+
+ /*
+ * stop timer
+ */
+ del_timer_sync(&fcoe_timer);
+
+ /*
+ * assuming that at this time there will be no
+ * ioctl in prograss, therefore we do not need to lock the
+ * list.
+ */
+ list_for_each_entry_safe(fc, tmp, &fcoe_hostlist, list)
+ fcoe_destroy_interface(fc->real_dev);
+
+ for (idx = 0; idx < NR_CPUS; idx++) {
+ if (fcoe_percpu[idx]) {
+ kthread_stop(fcoe_percpu[idx]->thread);
+ p = fcoe_percpu[idx];
+ spin_lock_bh(&p->fcoe_rx_list.lock);
+ while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL)
+ kfree_skb(skb);
+ spin_unlock_bh(&p->fcoe_rx_list.lock);
+ if (fcoe_percpu[idx]->crc_eof_page)
+ put_page(fcoe_percpu[idx]->crc_eof_page);
+ kfree(fcoe_percpu[idx]);
+ }
+ }
+
+ fcoe_sw_exit();
+}
+module_exit(fcoe_exit);
diff --git a/drivers/scsi/fcoe/fcoe_def.h b/drivers/scsi/fcoe/fcoe_def.h
new file mode 100644
index 0000000..b00e14b
--- /dev/null
+++ b/drivers/scsi/fcoe/fcoe_def.h
@@ -0,0 +1,92 @@
+/*
+ * Copyright(c) 2007 - 2008 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Maintained at www.Open-FCoE.org
+ */
+
+#ifndef _FCOE_DEF_H_
+#define _FCOE_DEF_H_
+
+#include <linux/etherdevice.h>
+#include <linux/if_ether.h>
+
+#include <scsi/libfc/libfc.h>
+
+#include <scsi/fc/fc_fcoe.h>
+
+#define FCOE_DRIVER_NAME "fcoe" /* driver name for ioctls */
+#define FCOE_DRIVER_VENDOR "Open-FC.org" /* vendor name for ioctls */
+
+#define FCOE_MIN_FRAME 36
+#define FCOE_WORD_TO_BYTE 4
+
+/*
+ * this is the main common structure across all instance of fcoe driver.
+ * There is one to one mapping between hba struct and ethernet nic.
+ * list of hbas contains pointer to the hba struct, these structures are
+ * stored in this array using there corresponding if_index.
+ */
+
+struct fcoe_percpu_s {
+ int cpu;
+ struct task_struct *thread;
+ struct sk_buff_head fcoe_rx_list;
+ struct page *crc_eof_page;
+ int crc_eof_offset;
+};
+
+extern struct timer_list fcoe_timer;
+extern rwlock_t fcoe_hostlist_lock;
+extern struct list_head fcoe_hostlist;
+extern struct fcoe_percpu_s *fcoe_percpu[];
+
+struct fcoe_softc {
+ struct list_head list;
+ struct fc_lport *lp;
+ struct net_device *real_dev;
+ struct net_device *phys_dev; /* device with ethtool_ops */
+ struct packet_type fcoe_packet_type;
+ struct sk_buff_head fcoe_pending_queue;
+ u16 user_mfs; /* configured max frame size */
+
+ u8 dest_addr[ETH_ALEN];
+ u8 ctl_src_addr[ETH_ALEN];
+ u8 data_src_addr[ETH_ALEN];
+ /*
+ * fcoe protocol address learning related stuff
+ */
+ u16 flogi_oxid;
+ u8 flogi_progress;
+ u8 address_mode;
+};
+
+int fcoe_percpu_receive_thread(void *arg);
+
+/*
+ * HBA transport ops prototypes
+ */
+void fcoe_clean_pending_queue(struct fc_lport *fd);
+void fcoe_watchdog(ulong vp);
+int fcoe_destroy_interface(struct net_device *);
+int fcoe_create_interface(struct net_device *);
+int fcoe_xmit(struct fc_lport *, struct fc_frame *);
+int fcoe_rcv(struct sk_buff *, struct net_device *,
+ struct packet_type *, struct net_device *);
+int fcoe_link_ok(struct fc_lport *);
+
+int __init fcoe_sw_init(void);
+void __exit fcoe_sw_exit(void);
+#endif /* _FCOE_DEF_H_ */
diff --git a/drivers/scsi/fcoe/fcoe_sw.c b/drivers/scsi/fcoe/fcoe_sw.c
new file mode 100644
index 0000000..30d6e1c
--- /dev/null
+++ b/drivers/scsi/fcoe/fcoe_sw.c
@@ -0,0 +1,516 @@
+/*
+ * Copyright(c) 2007 - 2008 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Maintained at www.Open-FCoE.org
+ */
+
+/*
+ * FCOE protocol file
+ */
+
+#include <linux/module.h>
+#include <linux/version.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/ethtool.h>
+#include <linux/if_ether.h>
+#include <linux/if_vlan.h>
+
+#include <scsi/fc/fc_els.h>
+#include <scsi/fc/fc_encaps.h>
+#include <scsi/fc/fc_fs.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_transport.h>
+#include <scsi/scsi_transport_fc.h>
+
+#include <scsi/libfc/libfc.h>
+
+#include <scsi/fc/fc_fcoe.h>
+#include "fcoe_def.h"
+
+#define FCOE_VERSION "0.1"
+
+#define FCOE_MAX_LUN 255
+#define FCOE_MAX_FCP_TARGET 256
+
+#define FCOE_MAX_OUTSTANDING_COMMANDS 1024
+
+#define FCOE_MIN_XID 0x0004
+#define FCOE_MAX_XID 0x07ef
+
+LIST_HEAD(fcoe_hostlist);
+DEFINE_RWLOCK(fcoe_hostlist_lock);
+DEFINE_TIMER(fcoe_timer, NULL, 0, 0);
+struct fcoe_percpu_s *fcoe_percpu[NR_CPUS];
+
+static struct scsi_transport_template *fcoe_transport_template;
+
+static int fcoe_reset(struct Scsi_Host *shost)
+{
+ struct fc_lport *lport = shost_priv(shost);
+ fc_lport_reset(lport);
+ return 0;
+}
+
+struct fc_function_template fcoe_transport_function = {
+ .show_host_node_name = 1,
+ .show_host_port_name = 1,
+ .show_host_supported_classes = 1,
+ .show_host_supported_fc4s = 1,
+ .show_host_active_fc4s = 1,
+ .show_host_maxframe_size = 1,
+
+ .show_host_port_id = 1,
+ .show_host_supported_speeds = 1,
+ .get_host_speed = fc_get_host_speed,
+ .show_host_speed = 1,
+ .show_host_port_type = 1,
+ .get_host_port_state = fc_get_host_port_state,
+ .show_host_port_state = 1,
+ .show_host_symbolic_name = 1,
+
+ .dd_fcrport_size = sizeof(struct fc_rport_libfc_priv),
+ .show_rport_maxframe_size = 1,
+ .show_rport_supported_classes = 1,
+
+ .show_host_fabric_name = 1,
+ .show_starget_node_name = 1,
+ .show_starget_port_name = 1,
+ .show_starget_port_id = 1,
+ .set_rport_dev_loss_tmo = fc_set_rport_loss_tmo,
+ .show_rport_dev_loss_tmo = 1,
+ .get_fc_host_stats = fc_get_host_stats,
+ .issue_fc_host_lip = fcoe_reset,
+
+ .terminate_rport_io = fc_rport_terminate_io,
+};
+
+static struct fcoe_softc *fcoe_find_fc_lport(const struct net_device *netdev)
+{
+ struct fcoe_softc *fc;
+
+ read_lock(&fcoe_hostlist_lock);
+ list_for_each_entry(fc, &fcoe_hostlist, list) {
+ if (fc->real_dev == netdev) {
+ read_unlock(&fcoe_hostlist_lock);
+ return fc;
+ }
+ }
+ read_unlock(&fcoe_hostlist_lock);
+ return NULL;
+}
+
+/*
+ * Convert 48-bit IEEE MAC address to 64-bit FC WWN.
+ */
+static u64 fcoe_wwn_from_mac(unsigned char mac[MAX_ADDR_LEN],
+ unsigned int scheme, unsigned int port)
+{
+ u64 wwn;
+ u64 host_mac;
+
+ /* The MAC is in NO, so flip only the low 48 bits */
+ host_mac = ((u64) mac[0] << 40) |
+ ((u64) mac[1] << 32) |
+ ((u64) mac[2] << 24) |
+ ((u64) mac[3] << 16) |
+ ((u64) mac[4] << 8) |
+ (u64) mac[5];
+
+ WARN_ON(host_mac >= (1ULL << 48));
+ wwn = host_mac | ((u64) scheme << 60);
+ switch (scheme) {
+ case 1:
+ WARN_ON(port != 0);
+ break;
+ case 2:
+ WARN_ON(port >= 0xfff);
+ wwn |= (u64) port << 48;
+ break;
+ default:
+ WARN_ON(1);
+ break;
+ }
+
+ return wwn;
+}
+
+static struct scsi_host_template fcoe_driver_template = {
+ .module = THIS_MODULE,
+ .name = "FCoE Driver",
+ .proc_name = FCOE_DRIVER_NAME,
+ .queuecommand = fc_queuecommand,
+ .eh_abort_handler = fc_eh_abort,
+ .eh_device_reset_handler = fc_eh_device_reset,
+ .eh_host_reset_handler = fc_eh_host_reset,
+ .slave_alloc = fc_slave_alloc,
+ .change_queue_depth = fc_change_queue_depth,
+ .change_queue_type = fc_change_queue_type,
+ .this_id = -1,
+ .cmd_per_lun = 32,
+ .can_queue = FCOE_MAX_OUTSTANDING_COMMANDS,
+ .use_clustering = ENABLE_CLUSTERING,
+ .sg_tablesize = 4,
+ .max_sectors = 0xffff,
+};
+
+int fcoe_destroy_interface(struct net_device *netdev)
+{
+ int cpu, idx;
+ struct fcoe_dev_stats *p;
+ struct fcoe_percpu_s *pp;
+ struct fcoe_softc *fc;
+ struct fcoe_rcv_info *fr;
+ struct sk_buff_head *list;
+ struct sk_buff *skb, *next;
+ struct sk_buff *head;
+ struct fc_lport *lp;
+
+ fc = fcoe_find_fc_lport(netdev);
+ if (!fc)
+ return -ENODEV;
+
+ lp = fc->lp;
+
+ /* Remove the instance from fcoe's list */
+ write_lock_bh(&fcoe_hostlist_lock);
+ list_del(&fc->list);
+ write_unlock_bh(&fcoe_hostlist_lock);
+
+ /* Don't listen for Ethernet packets anymore */
+ dev_remove_pack(&fc->fcoe_packet_type);
+
+ /* Detach from the scsi-ml */
+ fc_remove_host(lp->host);
+ scsi_remove_host(lp->host);
+
+ /* Cleanup the fc_lport */
+ fc_lport_destroy(lp);
+ fc_fcp_destroy(lp);
+ if (lp->emp)
+ fc_exch_mgr_free(lp->emp);
+
+ /* Delete secondary MAC addresses */
+ /* turn off promscuity */
+ dev_set_promiscuity(fc->real_dev, -1);
+
+ /* Free the per-CPU revieve threads */
+ for (idx = 0; idx < NR_CPUS; idx++) {
+ if (fcoe_percpu[idx]) {
+ pp = fcoe_percpu[idx];
+ spin_lock_bh(&pp->fcoe_rx_list.lock);
+ list = &pp->fcoe_rx_list;
+ head = list->next;
+ for (skb = head; skb != (struct sk_buff *)list;
+ skb = next) {
+ next = skb->next;
+ fr = fcoe_dev_from_skb(skb);
+ if (fr->fr_dev == fc->lp) {
+ __skb_unlink(skb, list);
+ kfree_skb(skb);
+ }
+ }
+ spin_unlock_bh(&pp->fcoe_rx_list.lock);
+ }
+ }
+
+ /* Free existing skbs */
+ fcoe_clean_pending_queue(lp);
+
+ /* Free memory used by statistical counters */
+ for_each_online_cpu(cpu) {
+ p = lp->dev_stats[cpu];
+ if (p) {
+ lp->dev_stats[cpu] = NULL;
+ kfree(p);
+ }
+ }
+
+ /* Release the net_device and Scsi_Host */
+ dev_put(fc->real_dev);
+ scsi_host_put(lp->host);
+ return 0;
+}
+
+/*
+ * Return zero if link is OK for use by FCoE.
+ * Any permanently-disqualifying conditions have been previously checked.
+ * This also updates the speed setting, which may change with link for 100/1000.
+ *
+ * This function should probably be checking for PAUSE support at some point
+ * in the future. Currently Per-priority-pause is not determinable using
+ * ethtool, so we shouldn't be restrictive until that problem is resolved.
+ */
+int fcoe_link_ok(struct fc_lport *lp)
+{
+ struct fcoe_softc *fc = (struct fcoe_softc *)lp->drv_priv;
+ struct net_device *dev = fc->real_dev;
+ struct ethtool_cmd ecmd = { ETHTOOL_GSET };
+ int rc = 0;
+
+ if ((dev->flags & IFF_UP) && netif_carrier_ok(dev)) {
+ dev = fc->phys_dev;
+ if (dev->ethtool_ops->get_settings) {
+ dev->ethtool_ops->get_settings(dev, &ecmd);
+ lp->link_supported_speeds &=
+ ~(FC_PORTSPEED_1GBIT | FC_PORTSPEED_10GBIT);
+ if (ecmd.supported & (SUPPORTED_1000baseT_Half |
+ SUPPORTED_1000baseT_Full))
+ lp->link_supported_speeds |= FC_PORTSPEED_1GBIT;
+ if (ecmd.supported & SUPPORTED_10000baseT_Full)
+ lp->link_supported_speeds |=
+ FC_PORTSPEED_10GBIT;
+ if (ecmd.speed == SPEED_1000)
+ lp->link_speed = FC_PORTSPEED_1GBIT;
+ if (ecmd.speed == SPEED_10000)
+ lp->link_speed = FC_PORTSPEED_10GBIT;
+ }
+ } else
+ rc = -1;
+
+ return rc;
+}
+
+static struct libfc_function_template fcoe_libfc_fcn_templ = {
+ .frame_send = fcoe_xmit,
+};
+
+static int lport_config(struct fc_lport *lp, struct Scsi_Host *shost)
+{
+ int i = 0;
+ struct fcoe_dev_stats *p;
+
+ lp->host = shost;
+ lp->drv_priv = (void *)(lp + 1);
+
+ lp->emp = fc_exch_mgr_alloc(lp, FC_CLASS_3,
+ FCOE_MIN_XID, FCOE_MAX_XID);
+ if (!lp->emp)
+ return -ENOMEM;
+
+ lp->link_status = 0;
+ lp->max_retry_count = 3;
+ lp->e_d_tov = 2 * 1000; /* FC-FS default */
+ lp->r_a_tov = 2 * 2 * 1000;
+ lp->service_params = (FCP_SPPF_INIT_FCN | FCP_SPPF_RD_XRDY_DIS |
+ FCP_SPPF_RETRY | FCP_SPPF_CONF_COMPL);
+
+ /*
+ * allocate per cpu stats block
+ */
+ for_each_online_cpu(i) {
+ p = kzalloc(sizeof(struct fcoe_dev_stats), GFP_KERNEL);
+ if (p)
+ lp->dev_stats[i] = p;
+ }
+
+ /* Finish fc_lport configuration */
+ fc_lport_config(lp);
+
+ return 0;
+}
+
+static int net_config(struct fc_lport *lp)
+{
+ u32 mfs;
+ u64 wwnn, wwpn;
+ struct net_device *net_dev;
+ struct fcoe_softc *fc = (struct fcoe_softc *)lp->drv_priv;
+
+ /* Require support for get_pauseparam ethtool op. */
+ net_dev = fc->real_dev;
+ if (net_dev->priv_flags & IFF_802_1Q_VLAN)
+ net_dev = VLAN_DEV_INFO(net_dev)->real_dev;
+ fc->phys_dev = net_dev;
+
+ /* Do not support for bonding device */
+ if ((fc->real_dev->priv_flags & IFF_MASTER_ALB) ||
+ (fc->real_dev->priv_flags & IFF_SLAVE_INACTIVE) ||
+ (fc->real_dev->priv_flags & IFF_MASTER_8023AD)) {
+ return -EOPNOTSUPP;
+ }
+
+ /*
+ * Determine max frame size based on underlying device and optional
+ * user-configured limit. If the MFS is too low, fcoe_link_ok()
+ * will return 0, so do this first.
+ */
+ mfs = fc->real_dev->mtu - (sizeof(struct fcoe_hdr) +
+ sizeof(struct fcoe_crc_eof));
+ fc_set_mfs(lp, mfs);
+
+ lp->link_status = ~FC_PAUSE & ~FC_LINK_UP;
+ if (!fcoe_link_ok(lp))
+ lp->link_status |= FC_LINK_UP;
+
+ if (fc->real_dev->features & NETIF_F_SG)
+ lp->sg_supp = 1;
+
+
+ skb_queue_head_init(&fc->fcoe_pending_queue);
+
+ /* setup Source Mac Address */
+ memcpy(fc->ctl_src_addr, fc->real_dev->dev_addr,
+ fc->real_dev->addr_len);
+
+ wwnn = fcoe_wwn_from_mac(fc->real_dev->dev_addr, 1, 0);
+ fc_set_wwnn(lp, wwnn);
+ /* XXX - 3rd arg needs to be vlan id */
+ wwpn = fcoe_wwn_from_mac(fc->real_dev->dev_addr, 2, 0);
+ fc_set_wwpn(lp, wwpn);
+
+ dev_set_promiscuity(fc->real_dev, 1);
+
+ /*
+ * setup the receive function from ethernet driver
+ * on the ethertype for the given device
+ */
+ fc->fcoe_packet_type.func = fcoe_rcv;
+ fc->fcoe_packet_type.type = __constant_htons(ETH_P_FCOE);
+ fc->fcoe_packet_type.dev = fc->real_dev;
+ dev_add_pack(&fc->fcoe_packet_type);
+
+ return 0;
+}
+
+static void shost_config(struct fc_lport *lp)
+{
+ lp->host->max_lun = FCOE_MAX_LUN;
+ lp->host->max_id = FCOE_MAX_FCP_TARGET;
+ lp->host->max_channel = 0;
+ lp->host->transportt = fcoe_transport_template;
+}
+
+static int libfc_config(struct fc_lport *lp)
+{
+ /* Set the function pointers set by the LLDD */
+ memcpy(&lp->tt, &fcoe_libfc_fcn_templ,
+ sizeof(struct libfc_function_template));
+
+ if (fc_fcp_init(lp))
+ return -ENOMEM;
+ fc_exch_init(lp);
+ fc_lport_init(lp);
+ fc_rport_init(lp);
+ fc_disc_init(lp);
+
+ return 0;
+}
+
+/*
+ * This function creates the fcoe interface
+ * create struct fcdev which is a shared structure between opefc
+ * and transport level protocol.
+ */
+int fcoe_create_interface(struct net_device *netdev)
+{
+ struct fc_lport *lp = NULL;
+ struct fcoe_softc *fc;
+ struct Scsi_Host *shost;
+ int rc = 0;
+
+ if (fcoe_find_fc_lport(netdev) != NULL)
+ return -EEXIST;
+
+ shost = scsi_host_alloc(&fcoe_driver_template,
+ sizeof(struct fc_lport) +
+ sizeof(struct fcoe_softc));
+
+ if (!shost) {
+ FC_DBG("Could not allocate host structure\n");
+ return -ENOMEM;
+ }
+
+ lp = shost_priv(shost);
+ rc = lport_config(lp, shost);
+ if (rc)
+ goto out_host_put;
+
+ /* Configure the fcoe_softc */
+ fc = (struct fcoe_softc *)lp->drv_priv;
+ fc->lp = lp;
+ fc->real_dev = netdev;
+ shost_config(lp);
+
+
+ /* Add the new host to the SCSI-ml */
+ rc = scsi_add_host(lp->host, NULL);
+ if (rc) {
+ FC_DBG("error on scsi_add_host\n");
+ goto out_lp_destroy;
+ }
+
+ sprintf(fc_host_symbolic_name(lp->host), "%s v%s over %s",
+ FCOE_DRIVER_NAME, FCOE_VERSION,
+ netdev->name);
+
+ /* Configure netdev and networking properties of the lp */
+ rc = net_config(lp);
+ if (rc)
+ goto out_lp_destroy;
+
+ /* Initialize the library */
+ rc = libfc_config(lp);
+ if (rc)
+ goto out_lp_destroy;
+
+ write_lock_bh(&fcoe_hostlist_lock);
+ list_add_tail(&fc->list, &fcoe_hostlist);
+ write_unlock_bh(&fcoe_hostlist_lock);
+
+ lp->boot_time = jiffies;
+
+ fc_fabric_login(lp);
+
+ dev_hold(netdev);
+ return rc;
+
+out_lp_destroy:
+ fc_exch_mgr_free(lp->emp); /* Free the EM */
+out_host_put:
+ scsi_host_put(lp->host);
+ return rc;
+}
+
+void fcoe_clean_pending_queue(struct fc_lport *lp)
+{
+ struct fcoe_softc *fc = lp->drv_priv;
+ struct sk_buff *skb;
+
+ spin_lock_bh(&fc->fcoe_pending_queue.lock);
+ while ((skb = __skb_dequeue(&fc->fcoe_pending_queue)) != NULL) {
+ spin_unlock_bh(&fc->fcoe_pending_queue.lock);
+ kfree_skb(skb);
+ spin_lock_bh(&fc->fcoe_pending_queue.lock);
+ }
+ spin_unlock_bh(&fc->fcoe_pending_queue.lock);
+}
+
+int __init fcoe_sw_init(void)
+{
+ fcoe_transport_template =
+ fc_attach_transport(&fcoe_transport_function);
+ return fcoe_transport_template ? 0 : -1;
+}
+
+void __exit fcoe_sw_exit(void)
+{
+ fc_release_transport(fcoe_transport_template);
+}
diff --git a/drivers/scsi/fcoe/libfcoe.c b/drivers/scsi/fcoe/libfcoe.c
new file mode 100644
index 0000000..f08f7c9
--- /dev/null
+++ b/drivers/scsi/fcoe/libfcoe.c
@@ -0,0 +1,620 @@
+/*
+ * Copyright(c) 2007 - 2008 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Maintained at www.Open-FCoE.org
+ */
+
+/*
+ * FCOE protocol file
+ */
+
+#include <linux/module.h>
+#include <linux/version.h>
+#include <linux/kernel.h>
+#include <linux/spinlock.h>
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/if_ether.h>
+#include <linux/kthread.h>
+#include <linux/crc32.h>
+#include <scsi/scsi_tcq.h>
+#include <scsi/scsicam.h>
+#include <scsi/scsi_transport.h>
+#include <scsi/scsi_transport_fc.h>
+
+#include <scsi/fc/fc_encaps.h>
+
+#include <scsi/libfc/libfc.h>
+#include <scsi/libfc/fc_frame.h>
+
+#include <scsi/fc/fc_fcoe.h>
+#include "fcoe_def.h"
+
+static int debug_fcoe;
+
+#define FCOE_MAX_QUEUE_DEPTH 256
+
+/* destination address mode */
+#define FCOE_GW_ADDR_MODE 0x00
+#define FCOE_FCOUI_ADDR_MODE 0x01
+
+/* Function Prototyes */
+static int fcoe_check_wait_queue(struct fc_lport *);
+static void fcoe_insert_wait_queue_head(struct fc_lport *, struct sk_buff *);
+static void fcoe_insert_wait_queue(struct fc_lport *, struct sk_buff *);
+static void fcoe_recv_flogi(struct fcoe_softc *, struct fc_frame *, u8 *);
+
+/*
+ * this is the fcoe receive function
+ * called by NET_RX_SOFTIRQ
+ * this function will receive the packet and
+ * build fc frame and pass it up
+ */
+int fcoe_rcv(struct sk_buff *skb, struct net_device *dev,
+ struct packet_type *ptype, struct net_device *olddev)
+{
+ struct fc_lport *lp;
+ struct fcoe_rcv_info *fr;
+ struct fcoe_softc *fc;
+ struct fcoe_dev_stats *stats;
+ u8 *data;
+ struct fc_frame_header *fh;
+ unsigned short oxid;
+ int cpu_idx;
+ struct fcoe_percpu_s *fps;
+
+ fc = container_of(ptype, struct fcoe_softc, fcoe_packet_type);
+ lp = fc->lp;
+ if (unlikely(lp == NULL)) {
+ FC_DBG("cannot find hba structure");
+ goto err2;
+ }
+
+ if (unlikely(debug_fcoe)) {
+ FC_DBG("skb_info: len:%d data_len:%d head:%p data:%p tail:%p "
+ "end:%p sum:%d dev:%s", skb->len, skb->data_len,
+ skb->head, skb->data, skb_tail_pointer(skb),
+ skb_end_pointer(skb), skb->csum,
+ skb->dev ? skb->dev->name : "<NULL>");
+
+ }
+
+ /* check for FCOE packet type */
+ if (unlikely(eth_hdr(skb)->h_proto != htons(ETH_P_FCOE))) {
+ FC_DBG("wrong FC type frame");
+ goto err;
+ }
+ data = skb->data;
+ data += sizeof(struct fcoe_hdr);
+ fh = (struct fc_frame_header *)data;
+ oxid = ntohs(fh->fh_ox_id);
+
+ fr = fcoe_dev_from_skb(skb);
+ fr->fr_dev = lp;
+ fr->ptype = ptype;
+ cpu_idx = 0;
+#ifdef CONFIG_SMP
+ /*
+ * The exchange ID are ANDed with num of online CPUs,
+ * so that will have the least lock contention in
+ * handling the exchange. if there is no thread
+ * for a given idx then use first online cpu.
+ */
+ cpu_idx = oxid & (num_online_cpus() >> 1);
+ if (fcoe_percpu[cpu_idx] == NULL)
+ cpu_idx = first_cpu(cpu_online_map);
+#endif
+ fps = fcoe_percpu[cpu_idx];
+
+ spin_lock_bh(&fps->fcoe_rx_list.lock);
+ __skb_queue_tail(&fps->fcoe_rx_list, skb);
+ if (fps->fcoe_rx_list.qlen == 1)
+ wake_up_process(fps->thread);
+
+ spin_unlock_bh(&fps->fcoe_rx_list.lock);
+
+ return 0;
+err:
+#ifdef CONFIG_SMP
+ stats = lp->dev_stats[smp_processor_id()];
+#else
+ stats = lp->dev_stats[0];
+#endif
+ stats->ErrorFrames++;
+
+err2:
+ kfree_skb(skb);
+ return -1;
+}
+
+static inline int fcoe_start_io(struct sk_buff *skb)
+{
+ int rc;
+
+ skb_get(skb);
+ rc = dev_queue_xmit(skb);
+ if (rc != 0)
+ return rc;
+ kfree_skb(skb);
+ return 0;
+}
+
+static int fcoe_get_paged_crc_eof(struct sk_buff *skb, int tlen)
+{
+ struct fcoe_percpu_s *fps;
+ struct page *page;
+ int cpu_idx;
+
+ cpu_idx = get_cpu();
+ fps = fcoe_percpu[cpu_idx];
+ page = fps->crc_eof_page;
+ if (!page) {
+ page = alloc_page(GFP_ATOMIC);
+ if (!page) {
+ put_cpu();
+ return -ENOMEM;
+ }
+ fps->crc_eof_page = page;
+ WARN_ON(fps->crc_eof_offset != 0);
+ }
+
+ get_page(page);
+ skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags, page,
+ fps->crc_eof_offset, tlen);
+ skb->len += tlen;
+ skb->data_len += tlen;
+ skb->truesize += tlen;
+ fps->crc_eof_offset += sizeof(struct fcoe_crc_eof);
+
+ if (fps->crc_eof_offset >= PAGE_SIZE) {
+ fps->crc_eof_page = NULL;
+ fps->crc_eof_offset = 0;
+ put_page(page);
+ }
+ put_cpu();
+ return 0;
+}
+
+/*
+ * this is the frame xmit routine
+ */
+int fcoe_xmit(struct fc_lport *lp, struct fc_frame *fp)
+{
+ int indx;
+ int wlen, rc = 0;
+ u32 crc;
+ struct ethhdr *eh;
+ struct fcoe_crc_eof *cp;
+ struct sk_buff *skb;
+ struct fcoe_dev_stats *stats;
+ struct fc_frame_header *fh;
+ unsigned int hlen; /* header length implies the version */
+ unsigned int tlen; /* trailer length */
+ int flogi_in_progress = 0;
+ struct fcoe_softc *fc;
+ void *data;
+ u8 sof, eof;
+ struct fcoe_hdr *hp;
+
+ WARN_ON((fr_len(fp) % sizeof(u32)) != 0);
+
+ fc = (struct fcoe_softc *)lp->drv_priv;
+ /*
+ * if it is a flogi then we need to learn gw-addr
+ * and my own fcid
+ */
+ fh = fc_frame_header_get(fp);
+ if (unlikely(fh->fh_r_ctl == FC_RCTL_ELS_REQ)) {
+ if (fc_frame_payload_op(fp) == ELS_FLOGI) {
+ fc->flogi_oxid = ntohs(fh->fh_ox_id);
+ fc->address_mode = FCOE_FCOUI_ADDR_MODE;
+ fc->flogi_progress = 1;
+ flogi_in_progress = 1;
+ } else if (fc->flogi_progress && ntoh24(fh->fh_s_id) != 0) {
+ /*
+ * Here we must've gotten an SID by accepting an FLOGI
+ * from a point-to-point connection. Switch to using
+ * the source mac based on the SID. The destination
+ * MAC in this case would have been set by receving the
+ * FLOGI.
+ */
+ fc_fcoe_set_mac(fc->data_src_addr, fh->fh_s_id);
+ fc->flogi_progress = 0;
+ }
+ }
+
+ skb = fp_skb(fp);
+ sof = fr_sof(fp);
+ eof = fr_eof(fp);
+
+ crc = ~0;
+ crc = crc32(crc, skb->data, skb_headlen(skb));
+
+ for (indx = 0; indx < skb_shinfo(skb)->nr_frags; indx++) {
+ skb_frag_t *frag = &skb_shinfo(skb)->frags[indx];
+ unsigned long off = frag->page_offset;
+ unsigned long len = frag->size;
+
+ while (len > 0) {
+ unsigned long clen;
+
+ clen = min(len, PAGE_SIZE - (off & ~PAGE_MASK));
+ data = kmap_atomic(frag->page + (off >> PAGE_SHIFT),
+ KM_SKB_DATA_SOFTIRQ);
+ crc = crc32(crc, data + (off & ~PAGE_MASK),
+ clen);
+ kunmap_atomic(data, KM_SKB_DATA_SOFTIRQ);
+ off += clen;
+ len -= clen;
+ }
+ }
+
+ /*
+ * Get header and trailer lengths.
+ * This is temporary code until we get rid of the old protocol.
+ * Both versions have essentially the same trailer layout but T11
+ * has padding afterwards.
+ */
+ hlen = sizeof(struct fcoe_hdr);
+ tlen = sizeof(struct fcoe_crc_eof);
+
+ /*
+ * copy fc crc and eof to the skb buff
+ * Use utility buffer in the fc_frame part of the sk_buff for the
+ * trailer.
+ * We don't do a get_page for this frag, since that page may not be
+ * managed that way. So that skb_free() doesn't do that either, we
+ * setup the destructor to remove this frag.
+ */
+ if (skb_is_nonlinear(skb)) {
+ skb_frag_t *frag;
+ if (fcoe_get_paged_crc_eof(skb, tlen)) {
+ kfree(skb);
+ return -ENOMEM;
+ }
+ frag = &skb_shinfo(skb)->frags[skb_shinfo(skb)->nr_frags - 1];
+ cp = kmap_atomic(frag->page, KM_SKB_DATA_SOFTIRQ)
+ + frag->page_offset;
+ } else {
+ cp = (struct fcoe_crc_eof *)skb_put(skb, tlen);
+ }
+
+ cp->fcoe_eof = eof;
+ cp->fcoe_crc32 = cpu_to_le32(~crc);
+ if (tlen == sizeof(*cp))
+ memset(cp->fcoe_resvd, 0, sizeof(cp->fcoe_resvd));
+ wlen = (skb->len - tlen + sizeof(crc)) / FCOE_WORD_TO_BYTE;
+
+ if (skb_is_nonlinear(skb)) {
+ kunmap_atomic(cp, KM_SKB_DATA_SOFTIRQ);
+ cp = NULL;
+ }
+
+ /*
+ * Fill in the control structures
+ */
+ skb->ip_summed = CHECKSUM_NONE;
+ eh = (struct ethhdr *)skb_push(skb, hlen + sizeof(struct ethhdr));
+ if (fc->address_mode == FCOE_FCOUI_ADDR_MODE)
+ fc_fcoe_set_mac(eh->h_dest, fh->fh_d_id);
+ else
+ /* insert GW address */
+ memcpy(eh->h_dest, fc->dest_addr, ETH_ALEN);
+
+ if (unlikely(flogi_in_progress))
+ memcpy(eh->h_source, fc->ctl_src_addr, ETH_ALEN);
+ else
+ memcpy(eh->h_source, fc->data_src_addr, ETH_ALEN);
+
+ eh->h_proto = htons(ETH_P_FCOE);
+ skb->protocol = htons(ETH_P_802_3);
+ skb_reset_mac_header(skb);
+ skb_reset_network_header(skb);
+
+ hp = (struct fcoe_hdr *)(eh + 1);
+ memset(hp, 0, sizeof(*hp));
+ if (FC_FCOE_VER)
+ FC_FCOE_ENCAPS_VER(hp, FC_FCOE_VER);
+ hp->fcoe_sof = sof;
+
+ stats = lp->dev_stats[smp_processor_id()];
+ stats->TxFrames++;
+ stats->TxWords += wlen;
+ skb->dev = fc->real_dev;
+
+ fr_dev(fp) = lp;
+ if (fc->fcoe_pending_queue.qlen)
+ rc = fcoe_check_wait_queue(lp);
+
+ if (rc == 0)
+ rc = fcoe_start_io(skb);
+
+ if (rc) {
+ fcoe_insert_wait_queue(lp, skb);
+ if (fc->fcoe_pending_queue.qlen > FCOE_MAX_QUEUE_DEPTH)
+ fc_pause(lp);
+ }
+
+ return 0;
+}
+
+int fcoe_percpu_receive_thread(void *arg)
+{
+ struct fcoe_percpu_s *p = arg;
+ u32 fr_len;
+ unsigned int hlen;
+ unsigned int tlen;
+ struct fc_lport *lp;
+ struct fcoe_rcv_info *fr;
+ struct fcoe_dev_stats *stats;
+ struct fc_frame_header *fh;
+ struct sk_buff *skb;
+ struct fcoe_crc_eof *cp;
+ enum fc_sof sof;
+ struct fc_frame *fp;
+ u8 *mac = NULL;
+ struct fcoe_softc *fc;
+ struct fcoe_hdr *hp;
+
+ set_user_nice(current, 19);
+
+ while (!kthread_should_stop()) {
+
+ spin_lock_bh(&p->fcoe_rx_list.lock);
+ while ((skb = __skb_dequeue(&p->fcoe_rx_list)) == NULL) {
+ set_current_state(TASK_INTERRUPTIBLE);
+ spin_unlock_bh(&p->fcoe_rx_list.lock);
+ schedule();
+ set_current_state(TASK_RUNNING);
+ if (kthread_should_stop())
+ return 0;
+ spin_lock_bh(&p->fcoe_rx_list.lock);
+ }
+ spin_unlock_bh(&p->fcoe_rx_list.lock);
+ fr = fcoe_dev_from_skb(skb);
+ lp = fr->fr_dev;
+ if (unlikely(lp == NULL)) {
+ FC_DBG("invalid HBA Structure");
+ kfree_skb(skb);
+ continue;
+ }
+
+ stats = lp->dev_stats[smp_processor_id()];
+
+ if (unlikely(debug_fcoe)) {
+ FC_DBG("skb_info: len:%d data_len:%d head:%p data:%p "
+ "tail:%p end:%p sum:%d dev:%s",
+ skb->len, skb->data_len,
+ skb->head, skb->data, skb_tail_pointer(skb),
+ skb_end_pointer(skb), skb->csum,
+ skb->dev ? skb->dev->name : "<NULL>");
+ }
+
+ /*
+ * Save source MAC address before discarding header.
+ */
+ fc = lp->drv_priv;
+ if (unlikely(fc->flogi_progress))
+ mac = eth_hdr(skb)->h_source;
+
+ if (skb_is_nonlinear(skb))
+ skb_linearize(skb); /* not ideal */
+
+ /*
+ * Check the header and pull it off.
+ */
+ hlen = sizeof(struct fcoe_hdr);
+
+ hp = (struct fcoe_hdr *)skb->data;
+ if (unlikely(FC_FCOE_DECAPS_VER(hp) != FC_FCOE_VER)) {
+ if (stats->ErrorFrames < 5)
+ FC_DBG("unknown FCoE version %x",
+ FC_FCOE_DECAPS_VER(hp));
+ stats->ErrorFrames++;
+ kfree_skb(skb);
+ continue;
+ }
+ sof = hp->fcoe_sof;
+ skb_pull(skb, sizeof(*hp));
+ fr_len = skb->len - sizeof(struct fcoe_crc_eof);
+ skb_trim(skb, fr_len);
+ tlen = sizeof(struct fcoe_crc_eof);
+
+ if (unlikely(fr_len > skb->len)) {
+ if (stats->ErrorFrames < 5)
+ FC_DBG("length error fr_len 0x%x skb->len 0x%x",
+ fr_len, skb->len);
+ stats->ErrorFrames++;
+ kfree_skb(skb);
+ continue;
+ }
+ stats->RxFrames++;
+ stats->RxWords += fr_len / FCOE_WORD_TO_BYTE;
+
+ fp = (struct fc_frame *) skb;
+ fc_frame_init(fp);
+ cp = (struct fcoe_crc_eof *)(skb->data + fr_len);
+ fr_eof(fp) = cp->fcoe_eof;
+ fr_sof(fp) = sof;
+ fr_dev(fp) = lp;
+
+ /*
+ * Check the CRC here, unless it's solicited data for SCSI.
+ * In that case, the SCSI layer can check it during the copy,
+ * and it'll be more cache-efficient.
+ */
+ fh = fc_frame_header_get(fp);
+ if (fh->fh_r_ctl == FC_RCTL_DD_SOL_DATA &&
+ fh->fh_type == FC_TYPE_FCP) {
+ fr_flags(fp) |= FCPHF_CRC_UNCHECKED;
+ fc_exch_recv(lp, lp->emp, fp);
+ } else if (le32_to_cpu(cp->fcoe_crc32) ==
+ ~crc32(~0, skb->data, fr_len)) {
+ if (unlikely(fc->flogi_progress))
+ fcoe_recv_flogi(fc, fp, mac);
+ fc_exch_recv(lp, lp->emp, fp);
+ } else {
+ if (debug_fcoe || stats->InvalidCRCCount < 5) {
+ printk(KERN_WARNING \
+ "fcoe: dropping frame with CRC error");
+ }
+ stats->InvalidCRCCount++;
+ stats->ErrorFrames++;
+ fc_frame_free(fp);
+ }
+ }
+ return 0;
+}
+
+/*
+ * Snoop potential response to FLOGI or even incoming FLOGI.
+ */
+static void fcoe_recv_flogi(struct fcoe_softc *fc, struct fc_frame *fp, u8 *sa)
+{
+ struct fc_frame_header *fh;
+ u8 op;
+
+ fh = fc_frame_header_get(fp);
+ if (fh->fh_type != FC_TYPE_ELS)
+ return;
+ op = fc_frame_payload_op(fp);
+ if (op == ELS_LS_ACC && fh->fh_r_ctl == FC_RCTL_ELS_REP &&
+ fc->flogi_oxid == ntohs(fh->fh_ox_id)) {
+ /*
+ * FLOGI accepted.
+ * If the src mac addr is FC_OUI-based, then we mark the
+ * address_mode flag to use FC_OUI-based Ethernet DA.
+ * Otherwise we use the FCoE gateway addr
+ */
+ if (!compare_ether_addr(sa, (u8[6]) FC_FCOE_FLOGI_MAC)) {
+ fc->address_mode = FCOE_FCOUI_ADDR_MODE;
+ } else {
+ memcpy(fc->dest_addr, sa, ETH_ALEN);
+ fc->address_mode = FCOE_GW_ADDR_MODE;
+ }
+
+ fc_fcoe_set_mac(fc->data_src_addr, fh->fh_d_id);
+ fc->flogi_progress = 0;
+ } else if (op == ELS_FLOGI && fh->fh_r_ctl == FC_RCTL_ELS_REQ && sa) {
+ /*
+ * Save source MAC for point-to-point responses.
+ */
+ memcpy(fc->dest_addr, sa, ETH_ALEN);
+ fc->address_mode = FCOE_GW_ADDR_MODE;
+ }
+}
+
+void fcoe_watchdog(ulong vp)
+{
+ struct fc_lport *lp;
+ struct fcoe_softc *fc;
+ int paused = 0;
+
+ read_lock(&fcoe_hostlist_lock);
+ list_for_each_entry(fc, &fcoe_hostlist, list) {
+ lp = fc->lp;
+ if (lp) {
+ if (fc->fcoe_pending_queue.qlen > FCOE_MAX_QUEUE_DEPTH)
+ paused = 1;
+ if (fcoe_check_wait_queue(lp) < FCOE_MAX_QUEUE_DEPTH) {
+ if (paused)
+ fc_unpause(lp);
+ }
+ }
+ }
+ read_unlock(&fcoe_hostlist_lock);
+
+ fcoe_timer.expires = jiffies + (1 * HZ);
+ add_timer(&fcoe_timer);
+}
+
+/*
+ * the wait_queue is used when the skb transmit fails. skb will go
+ * in the wait_queue which will be emptied by the time function OR
+ * by the next skb transmit.
+ *
+ */
+
+/*
+ * Function name : fcoe_check_wait_queue()
+ *
+ * Return Values : 0 or error
+ *
+ * Description : empties the wait_queue
+ * dequeue the head of the wait_queue queue and
+ * calls fcoe_start_io() for each packet
+ * if all skb have been transmitted, return 0
+ * if a error occurs, then restore wait_queue and try again
+ * later
+ *
+ */
+
+static int fcoe_check_wait_queue(struct fc_lport *lp)
+{
+ int rc, unpause = 0;
+ int paused = 0;
+ struct sk_buff *skb;
+ struct fcoe_softc *fc;
+
+ fc = (struct fcoe_softc *)lp->drv_priv;
+ spin_lock_bh(&fc->fcoe_pending_queue.lock);
+
+ /*
+ * is this interface paused?
+ */
+ if (fc->fcoe_pending_queue.qlen > FCOE_MAX_QUEUE_DEPTH)
+ paused = 1;
+ if (fc->fcoe_pending_queue.qlen) {
+ while ((skb = __skb_dequeue(&fc->fcoe_pending_queue)) != NULL) {
+ spin_unlock_bh(&fc->fcoe_pending_queue.lock);
+ rc = fcoe_start_io(skb);
+ if (rc) {
+ fcoe_insert_wait_queue_head(lp, skb);
+ return rc;
+ }
+ spin_lock_bh(&fc->fcoe_pending_queue.lock);
+ }
+ if (fc->fcoe_pending_queue.qlen < FCOE_MAX_QUEUE_DEPTH)
+ unpause = 1;
+ }
+ spin_unlock_bh(&fc->fcoe_pending_queue.lock);
+ if ((unpause) && (paused))
+ fc_unpause(lp);
+ return fc->fcoe_pending_queue.qlen;
+}
+
+static void fcoe_insert_wait_queue_head(struct fc_lport *lp,
+ struct sk_buff *skb)
+{
+ struct fcoe_softc *fc;
+
+ fc = (struct fcoe_softc *)lp->drv_priv;
+ spin_lock_bh(&fc->fcoe_pending_queue.lock);
+ __skb_queue_head(&fc->fcoe_pending_queue, skb);
+ spin_unlock_bh(&fc->fcoe_pending_queue.lock);
+}
+
+static void fcoe_insert_wait_queue(struct fc_lport *lp,
+ struct sk_buff *skb)
+{
+ struct fcoe_softc *fc;
+
+ fc = (struct fcoe_softc *)lp->drv_priv;
+ spin_lock_bh(&fc->fcoe_pending_queue.lock);
+ __skb_queue_tail(&fc->fcoe_pending_queue, skb);
+ spin_unlock_bh(&fc->fcoe_pending_queue.lock);
+}
diff --git a/drivers/scsi/libfc/Makefile b/drivers/scsi/libfc/Makefile
new file mode 100644
index 0000000..e6d4086
--- /dev/null
+++ b/drivers/scsi/libfc/Makefile
@@ -0,0 +1,11 @@
+# $Id: Makefile
+
+obj-$(CONFIG_LIBFC) += libfc.o
+
+libfc-objs := \
+ fc_disc.o \
+ fc_exch.o \
+ fc_frame.o \
+ fc_lport.o \
+ fc_rport.o \
+ fc_fcp.o
diff --git a/drivers/scsi/libfc/fc_disc.c b/drivers/scsi/libfc/fc_disc.c
new file mode 100644
index 0000000..a7a4547
--- /dev/null
+++ b/drivers/scsi/libfc/fc_disc.c
@@ -0,0 +1,621 @@
+/*
+ * Copyright(c) 2007 - 2008 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Maintained at www.Open-FCoE.org
+ */
+
+/*
+ * Target Discovery
+ *
+ * This block discovers all FC-4 remote ports, including FCP initiators. It
+ * also handles RSCN events and re-discovery if necessary.
+ */
+
+#include <linux/timer.h>
+#include <linux/err.h>
+#include <asm/unaligned.h>
+
+#include <scsi/fc/fc_gs.h>
+
+#include <scsi/libfc/libfc.h>
+
+#define FC_DISC_RETRY_LIMIT 3 /* max retries */
+#define FC_DISC_RETRY_DELAY 500UL /* (msecs) delay */
+
+static int fc_disc_debug;
+
+#define FC_DEBUG_DISC(fmt...) \
+ do { \
+ if (fc_disc_debug) \
+ FC_DBG(fmt); \
+ } while (0)
+
+static void fc_disc_gpn_ft_req(struct fc_lport *);
+static void fc_disc_gpn_ft_resp(struct fc_seq *, struct fc_frame *, void *);
+static int fc_disc_new_target(struct fc_lport *, struct fc_rport *,
+ struct fc_rport_identifiers *);
+static void fc_disc_del_target(struct fc_lport *, struct fc_rport *);
+static void fc_disc_done(struct fc_lport *);
+static void fc_disc_error(struct fc_lport *, struct fc_frame *);
+static void fc_disc_timeout(void *data);
+static void fc_disc_single(struct fc_lport *, struct fc_disc_port *);
+static int fc_disc_restart(struct fc_lport *);
+
+/**
+ * fc_disc_recv_rscn_req - Handle Registered State Change Notification (RSCN)
+ * @sp: Current sequence of the RSCN exchange
+ * @fp: RSCN Frame
+ * @lport: Fibre Channel host port instance
+ */
+static void fc_disc_recv_rscn_req(struct fc_seq *sp, struct fc_frame *fp,
+ struct fc_lport *lport)
+{
+ struct fc_els_rscn *rp;
+ struct fc_els_rscn_page *pp;
+ struct fc_seq_els_data rjt_data;
+ unsigned int len;
+ int redisc = 0;
+ enum fc_els_rscn_ev_qual ev_qual;
+ enum fc_els_rscn_addr_fmt fmt;
+ LIST_HEAD(disc_list);
+ struct fc_disc_port *dp, *next;
+
+ rp = fc_frame_payload_get(fp, sizeof(*rp));
+
+ if (!rp || rp->rscn_page_len != sizeof(*pp))
+ goto reject;
+
+ len = ntohs(rp->rscn_plen);
+ if (len < sizeof(*rp))
+ goto reject;
+ len -= sizeof(*rp);
+
+ for (pp = (void *)(rp + 1); len; len -= sizeof(*pp), pp++) {
+ ev_qual = pp->rscn_page_flags >> ELS_RSCN_EV_QUAL_BIT;
+ ev_qual &= ELS_RSCN_EV_QUAL_MASK;
+ fmt = pp->rscn_page_flags >> ELS_RSCN_ADDR_FMT_BIT;
+ fmt &= ELS_RSCN_ADDR_FMT_MASK;
+ /*
+ * if we get an address format other than port
+ * (area, domain, fabric), then do a full discovery
+ */
+ switch (fmt) {
+ case ELS_ADDR_FMT_PORT:
+ FC_DEBUG_DISC("Port address format for port (%6x)\n",
+ ntoh24(pp->rscn_fid));
+ dp = kzalloc(sizeof(*dp), GFP_KERNEL);
+ if (!dp) {
+ redisc = 1;
+ break;
+ }
+ dp->lp = lport;
+ dp->ids.port_id = ntoh24(pp->rscn_fid);
+ dp->ids.port_name = -1;
+ dp->ids.node_name = -1;
+ dp->ids.roles = FC_RPORT_ROLE_UNKNOWN;
+ list_add_tail(&dp->peers, &disc_list);
+ break;
+ case ELS_ADDR_FMT_AREA:
+ case ELS_ADDR_FMT_DOM:
+ case ELS_ADDR_FMT_FAB:
+ default:
+ FC_DEBUG_DISC("Address format is (%d)\n", fmt);
+ redisc = 1;
+ break;
+ }
+ }
+ lport->tt.seq_els_rsp_send(sp, ELS_LS_ACC, NULL);
+ if (redisc) {
+ FC_DEBUG_DISC("RSCN received: rediscovering\n");
+ list_for_each_entry_safe(dp, next, &disc_list, peers) {
+ list_del(&dp->peers);
+ kfree(dp);
+ }
+ fc_disc_restart(lport);
+ } else {
+ FC_DEBUG_DISC("RSCN received: not rediscovering. "
+ "redisc %d state %d in_prog %d\n",
+ redisc, lport->state, lport->disc_pending);
+ list_for_each_entry_safe(dp, next, &disc_list, peers) {
+ list_del(&dp->peers);
+ fc_disc_single(lport, dp);
+ }
+ }
+ fc_frame_free(fp);
+ return;
+reject:
+ rjt_data.fp = NULL;
+ rjt_data.reason = ELS_RJT_LOGIC;
+ rjt_data.explan = ELS_EXPL_NONE;
+ lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data);
+ fc_frame_free(fp);
+}
+
+/**
+ * fc_disc_recv_req - Handle incoming requests
+ * @sp: Current sequence of the request exchange
+ * @fp: The frame
+ * @lport: The FC local port
+ */
+static void fc_disc_recv_req(struct fc_seq *sp, struct fc_frame *fp,
+ struct fc_lport *lport)
+{
+ u8 op;
+
+ op = fc_frame_payload_op(fp);
+ switch (op) {
+ case ELS_RSCN:
+ fc_disc_recv_rscn_req(sp, fp, lport);
+ break;
+ default:
+ FC_DBG("Received an unsupported request. opcode (%x)\n", op);
+ break;
+ }
+}
+
+/**
+ * fc_disc_restart - Restart discovery
+ * @lport: FC local port
+ */
+static int fc_disc_restart(struct fc_lport *lport)
+{
+ if (!lport->disc_requested && !lport->disc_pending) {
+ schedule_delayed_work(&lport->disc_work,
+ msecs_to_jiffies(lport->disc_delay * 1000));
+ }
+ lport->disc_requested = 1;
+ return 0;
+}
+
+/**
+ * fc_disc_start - Fibre Channel Target discovery
+ * @lport: FC local port
+ *
+ * Returns non-zero if discovery cannot be started.
+ */
+static int fc_disc_start(struct fc_lport *lport)
+{
+ struct fc_rport *rport;
+ int error;
+ struct fc_rport_identifiers ids;
+
+ /*
+ * If not ready, or already running discovery, just set request flag.
+ */
+ if (!fc_lport_test_ready(lport) || lport->disc_pending) {
+ lport->disc_requested = 1;
+
+ return 0;
+ }
+ lport->disc_pending = 1;
+ lport->disc_requested = 0;
+ lport->disc_retry_count = 0;
+
+ /*
+ * Handle point-to-point mode as a simple discovery
+ * of the remote port.
+ */
+ rport = lport->ptp_rp;
+ if (rport) {
+ ids.port_id = rport->port_id;
+ ids.port_name = rport->port_name;
+ ids.node_name = rport->node_name;
+ ids.roles = FC_RPORT_ROLE_UNKNOWN;
+ get_device(&rport->dev);
+
+ error = fc_disc_new_target(lport, rport, &ids);
+ put_device(&rport->dev);
+ if (!error)
+ fc_disc_done(lport);
+ } else {
+ fc_disc_gpn_ft_req(lport); /* get ports by FC-4 type */
+ error = 0;
+ }
+ return error;
+}
+
+/**
+ * fc_disc_retry - Retry discovery
+ * @lport: FC local port
+ */
+static void fc_disc_retry(struct fc_lport *lport)
+{
+ unsigned long delay = FC_DISC_RETRY_DELAY;
+
+ if (!lport->disc_retry_count)
+ delay /= 4; /* timeout faster first time */
+ if (lport->disc_retry_count++ < FC_DISC_RETRY_LIMIT)
+ schedule_delayed_work(&lport->disc_work,
+ msecs_to_jiffies(delay));
+ else
+ fc_disc_done(lport);
+}
+
+/**
+ * fc_disc_new_target - Handle new target found by discovery
+ * @lport: FC local port
+ * @rport: The previous FC remote port (NULL if new remote port)
+ * @ids: Identifiers for the new FC remote port
+ */
+static int fc_disc_new_target(struct fc_lport *lport,
+ struct fc_rport *rport,
+ struct fc_rport_identifiers *ids)
+{
+ struct fc_rport_libfc_priv *rp;
+ int error = 0;
+
+ if (rport && ids->port_name) {
+ if (rport->port_name == -1) {
+ /*
+ * Set WWN and fall through to notify of create.
+ */
+ fc_rport_set_name(rport, ids->port_name,
+ rport->node_name);
+ } else if (rport->port_name != ids->port_name) {
+ /*
+ * This is a new port with the same FCID as
+ * a previously-discovered port. Presumably the old
+ * port logged out and a new port logged in and was
+ * assigned the same FCID. This should be rare.
+ * Delete the old one and fall thru to re-create.
+ */
+ fc_disc_del_target(lport, rport);
+ rport = NULL;
+ }
+ }
+ if (((ids->port_name != -1) || (ids->port_id != -1)) &&
+ ids->port_id != fc_host_port_id(lport->host) &&
+ ids->port_name != lport->wwpn) {
+ if (!rport) {
+ rport = lport->tt.rport_lookup(lport, ids->port_id);
+ if (!rport) {
+ struct fc_disc_port dp;
+ dp.lp = lport;
+ dp.ids.port_id = ids->port_id;
+ dp.ids.port_name = ids->port_name;
+ dp.ids.node_name = ids->node_name;
+ dp.ids.roles = ids->roles;
+ rport = fc_rport_rogue_create(&dp);
+ }
+ if (!rport)
+ error = ENOMEM;
+ }
+ if (rport) {
+ rp = rport->dd_data;
+ rp->event_callback = lport->tt.event_callback;
+ rp->rp_state = RPORT_ST_INIT;
+ lport->tt.rport_login(rport);
+ }
+ }
+ return error;
+}
+
+/**
+ * fc_disc_del_target - Delete a target
+ * @lport: FC local port
+ * @rport: The remote port to be removed
+ */
+static void fc_disc_del_target(struct fc_lport *lport, struct fc_rport *rport)
+{
+ lport->tt.rport_stop(rport);
+}
+
+/**
+ * fc_disc_done - Discovery has been completed
+ * @lport: FC local port
+ */
+static void fc_disc_done(struct fc_lport *lport)
+{
+ lport->disc_done = 1;
+ lport->disc_pending = 0;
+ if (lport->disc_requested)
+ lport->tt.disc_start(lport);
+}
+
+/**
+ * fc_disc_gpn_ft_req - Send Get Port Names by FC-4 type (GPN_FT) request
+ * @lport: FC local port
+ */
+static void fc_disc_gpn_ft_req(struct fc_lport *lport)
+{
+ struct fc_frame *fp;
+ struct fc_seq *sp = NULL;
+ struct req {
+ struct fc_ct_hdr ct;
+ struct fc_ns_gid_ft gid;
+ } *rp;
+ int error = 0;
+
+ lport->disc_buf_len = 0;
+ lport->disc_seq_count = 0;
+ fp = fc_frame_alloc(lport, sizeof(*rp));
+ if (!fp) {
+ error = ENOMEM;
+ } else {
+ rp = fc_frame_payload_get(fp, sizeof(*rp));
+ fc_fill_dns_hdr(lport, &rp->ct, FC_NS_GPN_FT, sizeof(rp->gid));
+ rp->gid.fn_fc4_type = FC_TYPE_FCP;
+
+ WARN_ON(!fc_lport_test_ready(lport));
+
+ fc_frame_setup(fp, FC_RCTL_DD_UNSOL_CTL, FC_TYPE_CT);
+ sp = lport->tt.exch_seq_send(lport, fp,
+ fc_disc_gpn_ft_resp, NULL,
+ lport, lport->e_d_tov,
+ fc_host_port_id(lport->host),
+ FC_FID_DIR_SERV,
+ FC_FC_SEQ_INIT | FC_FC_END_SEQ);
+ }
+ if (error || !sp)
+ fc_disc_retry(lport);
+}
+
+/**
+ * fc_disc_error - Handle error on dNS request
+ * @lport: FC local port
+ * @fp: The frame pointer
+ */
+static void fc_disc_error(struct fc_lport *lport, struct fc_frame *fp)
+{
+ long err = PTR_ERR(fp);
+
+ FC_DEBUG_DISC("Error %ld, retries %d/%d\n", PTR_ERR(fp),
+ lport->retry_count, FC_DISC_RETRY_LIMIT);
+
+ switch (err) {
+ case -FC_EX_TIMEOUT:
+ if (lport->disc_retry_count++ < FC_DISC_RETRY_LIMIT) {
+ fc_disc_gpn_ft_req(lport);
+ } else {
+ fc_disc_done(lport);
+ }
+ break;
+ default:
+ FC_DBG("Error code %ld not supported\n", err);
+ fc_disc_done(lport);
+ break;
+ }
+}
+
+/**
+ * fc_disc_gpn_ft_parse - Parse the list of IDs and names resulting from a request
+ * @lport: Fibre Channel host port instance
+ * @buf: GPN_FT response buffer
+ * @len: size of response buffer
+ */
+static int fc_disc_gpn_ft_parse(struct fc_lport *lport, void *buf, size_t len)
+{
+ struct fc_gpn_ft_resp *np;
+ char *bp;
+ size_t plen;
+ size_t tlen;
+ int error = 0;
+ struct fc_disc_port dp;
+ struct fc_rport *rport;
+ struct fc_rport_libfc_priv *rdata;
+
+ /*
+ * Handle partial name record left over from previous call.
+ */
+ bp = buf;
+ plen = len;
+ np = (struct fc_gpn_ft_resp *)bp;
+ tlen = lport->disc_buf_len;
+ if (tlen) {
+ WARN_ON(tlen >= sizeof(*np));
+ plen = sizeof(*np) - tlen;
+ WARN_ON(plen <= 0);
+ WARN_ON(plen >= sizeof(*np));
+ if (plen > len)
+ plen = len;
+ np = &lport->disc_buf;
+ memcpy((char *)np + tlen, bp, plen);
+
+ /*
+ * Set bp so that the loop below will advance it to the
+ * first valid full name element.
+ */
+ bp -= tlen;
+ len += tlen;
+ plen += tlen;
+ lport->disc_buf_len = (unsigned char) plen;
+ if (plen == sizeof(*np))
+ lport->disc_buf_len = 0;
+ }
+
+ /*
+ * Handle full name records, including the one filled from above.
+ * Normally, np == bp and plen == len, but from the partial case above,
+ * bp, len describe the overall buffer, and np, plen describe the
+ * partial buffer, which if would usually be full now.
+ * After the first time through the loop, things return to "normal".
+ */
+ while (plen >= sizeof(*np)) {
+ dp.lp = lport;
+ dp.ids.port_id = ntoh24(np->fp_fid);
+ dp.ids.port_name = ntohll(np->fp_wwpn);
+ dp.ids.node_name = -1;
+ dp.ids.roles = FC_RPORT_ROLE_UNKNOWN;
+
+ if ((dp.ids.port_id != fc_host_port_id(lport->host)) &&
+ (dp.ids.port_name != lport->wwpn)) {
+ rport = fc_rport_rogue_create(&dp);
+ if (rport) {
+ rdata = rport->dd_data;
+ rdata->event_callback = lport->tt.event_callback;
+ rdata->local_port = lport;
+ lport->tt.rport_login(rport);
+ } else
+ FC_DBG("Failed to allocate memory for "
+ "the newly discovered port (%6x)\n",
+ dp.ids.port_id);
+ }
+
+ if (np->fp_flags & FC_NS_FID_LAST) {
+ fc_disc_done(lport);
+ len = 0;
+ break;
+ }
+ len -= sizeof(*np);
+ bp += sizeof(*np);
+ np = (struct fc_gpn_ft_resp *)bp;
+ plen = len;
+ }
+
+ /*
+ * Save any partial record at the end of the buffer for next time.
+ */
+ if (error == 0 && len > 0 && len < sizeof(*np)) {
+ if (np != &lport->disc_buf)
+ memcpy(&lport->disc_buf, np, len);
+ lport->disc_buf_len = (unsigned char) len;
+ } else {
+ lport->disc_buf_len = 0;
+ }
+ return error;
+}
+
+/*
+ * Handle retry of memory allocation for remote ports.
+ */
+static void fc_disc_timeout(void *data)
+{
+ struct fc_lport *lport = data;
+
+ if (lport->disc_pending)
+ fc_disc_gpn_ft_req(lport);
+ else
+ lport->tt.disc_start(lport);
+}
+
+/**
+ * fc_disc_gpn_ft_resp - Handle a response frame from Get Port Names (GPN_FT)
+ * @sp: Current sequence of GPN_FT exchange
+ * @fp: response frame
+ * @lp_arg: Fibre Channel host port instance
+ *
+ * The response may be in multiple frames
+ */
+static void fc_disc_gpn_ft_resp(struct fc_seq *sp, struct fc_frame *fp,
+ void *lp_arg)
+{
+ struct fc_lport *lport = lp_arg;
+ struct fc_ct_hdr *cp;
+ struct fc_frame_header *fh;
+ unsigned int seq_cnt;
+ void *buf = NULL;
+ unsigned int len;
+ int error;
+
+ if (IS_ERR(fp)) {
+ fc_disc_error(lport, fp);
+ return;
+ }
+
+ WARN_ON(!fc_frame_is_linear(fp)); /* buffer must be contiguous */
+ fh = fc_frame_header_get(fp);
+ len = fr_len(fp) - sizeof(*fh);
+ seq_cnt = ntohs(fh->fh_seq_cnt);
+ if (fr_sof(fp) == FC_SOF_I3 && seq_cnt == 0 &&
+ lport->disc_seq_count == 0) {
+ cp = fc_frame_payload_get(fp, sizeof(*cp));
+ if (cp == NULL) {
+ FC_DBG("GPN_FT response too short, len %d\n",
+ fr_len(fp));
+ } else if (ntohs(cp->ct_cmd) == FC_FS_ACC) {
+
+ /*
+ * Accepted. Parse response.
+ */
+ buf = cp + 1;
+ len -= sizeof(*cp);
+ } else if (ntohs(cp->ct_cmd) == FC_FS_RJT) {
+ FC_DBG("GPN_FT rejected reason %x exp %x "
+ "(check zoning)\n", cp->ct_reason,
+ cp->ct_explan);
+ fc_disc_done(lport);
+ } else {
+ FC_DBG("GPN_FT unexpected response code %x\n",
+ ntohs(cp->ct_cmd));
+ }
+ } else if (fr_sof(fp) == FC_SOF_N3 &&
+ seq_cnt == lport->disc_seq_count) {
+ buf = fh + 1;
+ } else {
+ FC_DBG("GPN_FT unexpected frame - out of sequence? "
+ "seq_cnt %x expected %x sof %x eof %x\n",
+ seq_cnt, lport->disc_seq_count, fr_sof(fp), fr_eof(fp));
+ }
+ if (buf) {
+ error = fc_disc_gpn_ft_parse(lport, buf, len);
+ if (error)
+ fc_disc_retry(lport);
+ else
+ lport->disc_seq_count++;
+ }
+ fc_frame_free(fp);
+}
+
+/**
+ * fc_disc_single - Discover the directory information for a single target
+ * @lport: FC local port
+ * @dp: The port to rediscover
+ *
+ * This could be from an RSCN that reported a change for the target.
+ */
+static void fc_disc_single(struct fc_lport *lport, struct fc_disc_port *dp)
+{
+ struct fc_rport *rport;
+ struct fc_rport *new_rport;
+ struct fc_rport_libfc_priv *rdata;
+
+ if (dp->ids.port_id == fc_host_port_id(lport->host))
+ goto out;
+
+ rport = lport->tt.rport_lookup(lport, dp->ids.port_id);
+ if (rport) {
+ fc_disc_del_target(lport, rport);
+ put_device(&rport->dev); /* hold from lookup */
+ }
+
+ new_rport = fc_rport_rogue_create(dp);
+ if (new_rport) {
+ rdata = new_rport->dd_data;
+ rdata->event_callback = lport->tt.event_callback;
+ kfree(dp);
+ lport->tt.rport_login(new_rport);
+ }
+ return;
+out:
+ kfree(dp);
+}
+
+/**
+ * fc_disc_init - Initialize the discovery block
+ * @lport: FC local port
+ */
+int fc_disc_init(struct fc_lport *lport)
+{
+ INIT_WORK(&lport->disc_work, fc_disc_timeout, lport);
+ if (!lport->tt.disc_start)
+ lport->tt.disc_start = fc_disc_start;
+
+ if (!lport->tt.disc_recv_req)
+ lport->tt.disc_recv_req = fc_disc_recv_req;
+
+ return 0;
+}
+EXPORT_SYMBOL(fc_disc_init);
diff --git a/drivers/scsi/libfc/fc_exch.c b/drivers/scsi/libfc/fc_exch.c
new file mode 100644
index 0000000..b530de0
--- /dev/null
+++ b/drivers/scsi/libfc/fc_exch.c
@@ -0,0 +1,2058 @@
+/*
+ * Copyright(c) 2007 Intel Corporation. All rights reserved.
+ * Copyright(c) 2008 Red Hat, Inc. All rights reserved.
+ * Copyright(c) 2008 Mike Christie
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Maintained at www.Open-FCoE.org
+ */
+
+/*
+ * Fibre Channel exchange and sequence handling.
+ */
+
+#include <linux/timer.h>
+#include <linux/gfp.h>
+#include <linux/err.h>
+#include <linux/mempool.h>
+
+#include <scsi/fc/fc_fc2.h>
+
+#include <scsi/libfc/libfc.h>
+
+#define FC_DEF_R_A_TOV (10 * 1000) /* resource allocation timeout */
+
+/*
+ * fc_exch_debug can be set in debugger or at compile time to get more logs.
+ */
+static int fc_exch_debug;
+
+#define FC_DEBUG_EXCH(fmt...) \
+ do { \
+ if (fc_exch_debug) \
+ FC_DBG(fmt); \
+ } while (0)
+
+static struct kmem_cache *fc_em_cachep; /* cache for exchanges */
+
+/*
+ * Structure and function definitions for managing Fibre Channel Exchanges
+ * and Sequences.
+ *
+ * The three primary structures used here are fc_exch_mgr, fc_exch, and fc_seq.
+ *
+ * fc_exch_mgr holds the exchange state for an N port
+ *
+ * fc_exch holds state for one exchange and links to its active sequence.
+ *
+ * fc_seq holds the state for an individual sequence.
+ */
+
+/*
+ * Sequence.
+ */
+struct fc_seq {
+ u8 id; /* seq ID */
+ u16 ssb_stat; /* status flags for sequence status block */
+ u16 cnt; /* frames sent so far on sequence */
+ u32 f_ctl; /* F_CTL flags for frames */
+ u32 rec_data; /* FC-4 value for REC */
+};
+
+struct fc_exch;
+
+#define FC_EX_DONE (1 << 0) /* ep is completed */
+#define FC_EX_RST_CLEANUP (1 << 1) /* reset is forcing completion */
+
+/*
+ * Exchange.
+ *
+ * Locking notes: The ex_lock protects changes to the following fields:
+ * esb_stat, f_ctl, seq.ssb_stat, seq.f_ctl.
+ * seq_id
+ * sequence allocation
+ *
+ * If the em_lock and ex_lock must be taken at the same time, the
+ * em_lock must be taken before the ex_lock.
+ */
+struct fc_exch {
+ struct fc_exch_mgr *em; /* exchange manager */
+ u32 state; /* internal driver state */
+ u16 xid; /* our exchange ID */
+ struct list_head ex_list; /* free or busy list linkage */
+ spinlock_t ex_lock; /* lock covering exchange state */
+ atomic_t ex_refcnt; /* reference counter */
+ struct work_struct timeout_work; /* timer for upper level protocols */
+ struct fc_lport *lp; /* fc device instance */
+ u16 oxid; /* originator's exchange ID */
+ u16 rxid; /* responder's exchange ID */
+ u32 oid; /* originator's FCID */
+ u32 sid; /* source FCID */
+ u32 did; /* destination FCID */
+ u32 esb_stat; /* exchange status for ESB */
+ u32 r_a_tov; /* r_a_tov from rport (msec) */
+ u8 seq_id; /* next sequence ID to use */
+ u32 f_ctl; /* F_CTL flags for sequences */
+ u8 fh_type; /* frame type */
+ enum fc_class class; /* class of service */
+ struct fc_seq seq; /* single sequence */
+ /*
+ * Handler for responses to this current exchange.
+ */
+ void (*resp)(struct fc_seq *, struct fc_frame *, void *);
+ void (*destructor)(struct fc_seq *, void *);
+ /*
+ * arg is passed as void pointer to exchange
+ * resp and destructor handlers
+ */
+ void *arg;
+};
+
+/*
+ * Exchange manager.
+ *
+ * This structure is the center for creating exchanges and sequences.
+ * It manages the allocation of exchange IDs.
+ */
+struct fc_exch_mgr {
+ enum fc_class class; /* default class for sequences */
+ spinlock_t em_lock; /* exchange manager lock */
+ u16 last_xid; /* last allocated exchange ID */
+ u16 min_xid; /* min exchange ID */
+ u16 max_xid; /* max exchange ID */
+ u32 total_exches; /* total allocated exchanges */
+ struct list_head ex_list; /* allocated exchanges list */
+ struct fc_lport *lp; /* fc device instance */
+ mempool_t *ep_pool; /* reserve ep's */
+
+ /*
+ * currently exchange mgr stats are updated but not used.
+ * either stats can be expose via sysfs or remove them
+ * all together if not used XXX
+ */
+ struct {
+ atomic_t no_free_exch;
+ atomic_t no_free_exch_xid;
+ atomic_t xid_not_found;
+ atomic_t xid_busy;
+ atomic_t seq_not_found;
+ atomic_t non_bls_resp;
+ } stats;
+ struct fc_exch **exches; /* for exch pointers indexed by xid */
+};
+
+#define fc_seq_exch(sp) container_of(sp, struct fc_exch, seq)
+#define fc_exch_next_xid(mp, id) ((id == mp->max_xid) ? mp->min_xid : id + 1)
+
+static void fc_exch_rrq(struct fc_exch *);
+static void fc_seq_ls_acc(struct fc_seq *);
+static void fc_seq_ls_rjt(struct fc_seq *, enum fc_els_rjt_reason,
+ enum fc_els_rjt_explan);
+static void fc_exch_els_rec(struct fc_seq *, struct fc_frame *);
+static void fc_exch_els_rrq(struct fc_seq *, struct fc_frame *);
+static struct fc_seq *fc_seq_start_next_locked(struct fc_seq *sp);
+
+/*
+ * Internal implementation notes.
+ *
+ * The exchange manager is one by default in libfc but LLD may choose
+ * to have one per CPU. The sequence manager is one per exchange manager
+ * and currently never separated.
+ *
+ * Section 9.8 in FC-FS-2 specifies: "The SEQ_ID is a one-byte field
+ * assigned by the Sequence Initiator that shall be unique for a specific
+ * D_ID and S_ID pair while the Sequence is open." Note that it isn't
+ * qualified by exchange ID, which one might think it would be.
+ * In practice this limits the number of open sequences and exchanges to 256
+ * per session. For most targets we could treat this limit as per exchange.
+ *
+ * The exchange and its sequence are freed when the last sequence is received.
+ * It's possible for the remote port to leave an exchange open without
+ * sending any sequences.
+ *
+ * Notes on reference counts:
+ *
+ * Exchanges are reference counted and exchange gets freed when the reference
+ * count becomes zero.
+ *
+ * Timeouts:
+ * Sequences are timed out for E_D_TOV and R_A_TOV.
+ *
+ * Sequence event handling:
+ *
+ * The following events may occur on initiator sequences:
+ *
+ * Send.
+ * For now, the whole thing is sent.
+ * Receive ACK
+ * This applies only to class F.
+ * The sequence is marked complete.
+ * ULP completion.
+ * The upper layer calls fc_exch_done() when done
+ * with exchange and sequence tuple.
+ * RX-inferred completion.
+ * When we receive the next sequence on the same exchange, we can
+ * retire the previous sequence ID. (XXX not implemented).
+ * Timeout.
+ * R_A_TOV frees the sequence ID. If we're waiting for ACK,
+ * E_D_TOV causes abort and calls upper layer response handler
+ * with FC_EX_TIMEOUT error.
+ * Receive RJT
+ * XXX defer.
+ * Send ABTS
+ * On timeout.
+ *
+ * The following events may occur on recipient sequences:
+ *
+ * Receive
+ * Allocate sequence for first frame received.
+ * Hold during receive handler.
+ * Release when final frame received.
+ * Keep status of last N of these for the ELS RES command. XXX TBD.
+ * Receive ABTS
+ * Deallocate sequence
+ * Send RJT
+ * Deallocate
+ *
+ * For now, we neglect conditions where only part of a sequence was
+ * received or transmitted, or where out-of-order receipt is detected.
+ */
+
+/*
+ * Locking notes:
+ *
+ * The EM code run in a per-CPU worker thread.
+ *
+ * To protect against concurrency between a worker thread code and timers,
+ * sequence allocation and deallocation must be locked.
+ * - exchange refcnt can be done atomicly without locks.
+ * - sequence allocation must be locked by exch lock.
+ */
+
+/*
+ * opcode names for debugging.
+ */
+static char *fc_exch_rctl_names[] = FC_RCTL_NAMES_INIT;
+
+#define FC_TABLE_SIZE(x) (sizeof(x) / sizeof(x[0]))
+
+static inline const char *fc_exch_name_lookup(unsigned int op, char **table,
+ unsigned int max_index)
+{
+ const char *name = NULL;
+
+ if (op < max_index)
+ name = table[op];
+ if (!name)
+ name = "unknown";
+ return name;
+}
+
+static const char *fc_exch_rctl_name(unsigned int op)
+{
+ return fc_exch_name_lookup(op, fc_exch_rctl_names,
+ FC_TABLE_SIZE(fc_exch_rctl_names));
+}
+
+/*
+ * Hold an exchange - keep it from being freed.
+ */
+static void fc_exch_hold(struct fc_exch *ep)
+{
+ atomic_inc(&ep->ex_refcnt);
+}
+
+/*
+ * Fill in frame header.
+ *
+ * The following fields are the responsibility of this routine:
+ * d_id, s_id, df_ctl, oxid, rxid, cs_ctl, seq_id
+ *
+ * The following fields are handled by the caller.
+ * r_ctl, type, f_ctl, seq_cnt, parm_offset
+ *
+ * That should be a complete list.
+ *
+ * We may be the originator or responder to the sequence.
+ */
+static void fc_seq_fill_hdr(struct fc_seq *sp, struct fc_frame *fp)
+{
+ struct fc_frame_header *fh = fc_frame_header_get(fp);
+ struct fc_exch *ep;
+
+ ep = fc_seq_exch(sp);
+
+ hton24(fh->fh_s_id, ep->sid);
+ hton24(fh->fh_d_id, ep->did);
+ fh->fh_ox_id = htons(ep->oxid);
+ fh->fh_rx_id = htons(ep->rxid);
+ fh->fh_seq_id = sp->id;
+ fh->fh_cs_ctl = 0;
+ fh->fh_df_ctl = 0;
+}
+
+/*
+ * Release a reference to an exchange.
+ * If the refcnt goes to zero and the exchange is complete, it is freed.
+ */
+static void fc_exch_release(struct fc_exch *ep)
+{
+ struct fc_exch_mgr *mp;
+
+ if (atomic_dec_and_test(&ep->ex_refcnt)) {
+ mp = ep->em;
+ if (ep->destructor)
+ ep->destructor(&ep->seq, ep->arg);
+ if (ep->lp->tt.exch_put)
+ ep->lp->tt.exch_put(ep->lp, mp, ep->xid);
+ WARN_ON(!ep->esb_stat & ESB_ST_COMPLETE);
+ mempool_free(ep, mp->ep_pool);
+ }
+}
+
+static int fc_exch_done_locked(struct fc_exch *ep)
+{
+ int rc = 1;
+
+ /*
+ * We must check for completion in case there are two threads
+ * tyring to complete this. But the rrq code will reuse the
+ * ep, and in that case we only clear the resp and set it as
+ * complete, so it can be reused by the timer to send the rrq.
+ */
+ ep->resp = NULL;
+ if (ep->state & FC_EX_DONE)
+ return rc;
+ ep->esb_stat |= ESB_ST_COMPLETE;
+
+ if (!(ep->esb_stat & ESB_ST_REC_QUAL)) {
+ ep->state |= FC_EX_DONE;
+ if (cancel_delayed_work(&ep->timeout_work))
+ atomic_dec(&ep->ex_refcnt); /* drop hold for timer */
+ rc = 0;
+ }
+ return rc;
+}
+
+static void fc_exch_mgr_delete_ep(struct fc_exch *ep)
+{
+ struct fc_exch_mgr *mp;
+
+ mp = ep->em;
+ spin_lock_bh(&mp->em_lock);
+ WARN_ON(mp->total_exches <= 0);
+ mp->total_exches--;
+ mp->exches[ep->xid - mp->min_xid] = NULL;
+ list_del(&ep->ex_list);
+ spin_unlock_bh(&mp->em_lock);
+ fc_exch_release(ep); /* drop hold for exch in mp */
+}
+
+/*
+ * Internal version of fc_exch_timer_set - used with lock held.
+ */
+static inline void fc_exch_timer_set_locked(struct fc_exch *ep,
+ unsigned int timer_msec)
+{
+ if (ep->state & (FC_EX_RST_CLEANUP | FC_EX_DONE))
+ return;
+
+ FC_DEBUG_EXCH("Exchange (%4x) timed out, notifying the upper layer\n",
+ ep->xid);
+ if (schedule_delayed_work(&ep->timeout_work,
+ msecs_to_jiffies(timer_msec)))
+ fc_exch_hold(ep); /* hold for timer */
+}
+
+/*
+ * Set timer for an exchange.
+ * The time is a minimum delay in milliseconds until the timer fires.
+ * Used for upper level protocols to time out the exchange.
+ * The timer is cancelled when it fires or when the exchange completes.
+ * Returns non-zero if a timer couldn't be allocated.
+ */
+static void fc_exch_timer_set(struct fc_exch *ep, unsigned int timer_msec)
+{
+ spin_lock_bh(&ep->ex_lock);
+ fc_exch_timer_set_locked(ep, timer_msec);
+ spin_unlock_bh(&ep->ex_lock);
+}
+
+int fc_seq_exch_abort(const struct fc_seq *req_sp, unsigned int timer_msec)
+{
+ struct fc_seq *sp;
+ struct fc_exch *ep;
+ struct fc_frame *fp;
+ int error;
+
+ ep = fc_seq_exch(req_sp);
+
+ spin_lock_bh(&ep->ex_lock);
+ if (ep->esb_stat & (ESB_ST_COMPLETE | ESB_ST_ABNORMAL) ||
+ ep->state & (FC_EX_DONE | FC_EX_RST_CLEANUP)) {
+ spin_unlock_bh(&ep->ex_lock);
+ return -ENXIO;
+ }
+
+ /*
+ * Send the abort on a new sequence if possible.
+ */
+ sp = fc_seq_start_next_locked(&ep->seq);
+ if (!sp) {
+ spin_unlock_bh(&ep->ex_lock);
+ return -ENOMEM;
+ }
+
+ sp->f_ctl |= FC_FC_SEQ_INIT;
+ ep->esb_stat |= ESB_ST_SEQ_INIT | ESB_ST_ABNORMAL;
+ if (timer_msec)
+ fc_exch_timer_set_locked(ep, timer_msec);
+ spin_unlock_bh(&ep->ex_lock);
+
+ /*
+ * If not logged into the fabric, don't send ABTS but leave
+ * sequence active until next timeout.
+ */
+ if (!ep->sid)
+ return 0;
+
+ /*
+ * Send an abort for the sequence that timed out.
+ */
+ fp = fc_frame_alloc(ep->lp, 0);
+ if (fp) {
+ fc_frame_setup(fp, FC_RCTL_BA_ABTS, FC_TYPE_BLS);
+ error = fc_seq_send(ep->lp, sp, fp, FC_FC_END_SEQ);
+ } else
+ error = -ENOBUFS;
+ return error;
+}
+EXPORT_SYMBOL(fc_seq_exch_abort);
+
+/*
+ * Exchange timeout - handle exchange timer expiration.
+ * The timer will have been cancelled before this is called.
+ */
+static void fc_exch_timeout(void *data)
+{
+ struct fc_exch *ep = data;
+ struct fc_seq *sp = &ep->seq;
+ void (*resp)(struct fc_seq *, struct fc_frame *fp, void *arg);
+ void *arg;
+ u32 e_stat;
+ int rc = 1;
+
+ spin_lock_bh(&ep->ex_lock);
+ if (ep->state & (FC_EX_RST_CLEANUP | FC_EX_DONE))
+ goto unlock;
+
+ e_stat = ep->esb_stat;
+ if (e_stat & ESB_ST_COMPLETE) {
+ ep->esb_stat = e_stat & ~ESB_ST_REC_QUAL;
+ if (e_stat & ESB_ST_REC_QUAL)
+ fc_exch_rrq(ep);
+ spin_unlock_bh(&ep->ex_lock);
+ goto done;
+ } else {
+ resp = ep->resp;
+ arg = ep->arg;
+ ep->resp = NULL;
+ if (e_stat & ESB_ST_ABNORMAL)
+ rc = fc_exch_done_locked(ep);
+ spin_unlock_bh(&ep->ex_lock);
+ if (!rc)
+ fc_exch_mgr_delete_ep(ep);
+ if (resp)
+ resp(sp, ERR_PTR(-FC_EX_TIMEOUT), arg);
+ fc_seq_exch_abort(sp, 2 * ep->r_a_tov);
+ goto done;
+ }
+unlock:
+ spin_unlock_bh(&ep->ex_lock);
+done:
+ /*
+ * This release matches the hold taken when the timer was set.
+ */
+ fc_exch_release(ep);
+}
+
+/*
+ * Allocate a sequence.
+ *
+ * We don't support multiple originated sequences on the same exchange.
+ * By implication, any previously originated sequence on this exchange
+ * is complete, and we reallocate the same sequence.
+ */
+static struct fc_seq *fc_seq_alloc(struct fc_exch *ep, u8 seq_id)
+{
+ struct fc_seq *sp;
+
+ sp = &ep->seq;
+ sp->ssb_stat = 0;
+ sp->f_ctl = 0;
+ sp->cnt = 0;
+ sp->id = seq_id;
+ return sp;
+}
+
+/*
+ * Allocate an exchange.
+ *
+ * if xid is supplied zero then assign next free exchange ID
+ * from exchange manager, otherwise use supplied xid.
+ * Returns with exch lock held.
+ */
+struct fc_exch *fc_exch_alloc(struct fc_exch_mgr *mp, u16 xid)
+{
+ struct fc_exch *ep = NULL;
+ u16 min_xid, max_xid;
+
+ min_xid = mp->min_xid;
+ max_xid = mp->max_xid;
+ /*
+ * if xid is supplied then verify its xid range
+ */
+ if (xid) {
+ if (unlikely((xid < min_xid) || (xid > max_xid))) {
+ FC_DBG("Invalid xid 0x:%x\n", xid);
+ goto out;
+ }
+ if (unlikely(mp->exches[xid - min_xid] != NULL)) {
+ FC_DBG("xid 0x:%x is already in use\n", xid);
+ goto out;
+ }
+ }
+
+ /*
+ * Allocate new exchange
+ */
+ ep = mempool_alloc(mp->ep_pool, GFP_ATOMIC);
+ if (!ep) {
+ atomic_inc(&mp->stats.no_free_exch);
+ goto out;
+ }
+ memset(ep, 0, sizeof(*ep));
+
+ spin_lock_bh(&mp->em_lock);
+
+ /*
+ * if xid is zero then assign next free exchange ID
+ */
+ if (!xid) {
+ xid = fc_exch_next_xid(mp, mp->last_xid);
+ /*
+ * find next free xid using linear search
+ */
+ while (mp->exches[xid - min_xid] != NULL) {
+ if (xid == mp->last_xid)
+ break;
+ xid = fc_exch_next_xid(mp, xid);
+ }
+
+ if (unlikely(mp->exches[xid - min_xid] != NULL))
+ goto err;
+ mp->last_xid = xid;
+ }
+
+ /* lport lock ? */
+ if (mp->lp->state == LPORT_ST_RESET)
+ goto err; /* don't add new ep during local port reset */
+
+ fc_exch_hold(ep); /* hold for exch in mp */
+ spin_lock_init(&ep->ex_lock);
+ /*
+ * Hold exch lock for caller to prevent fc_exch_reset()
+ * from releasing exch while fc_exch_alloc() caller is
+ * still working on exch.
+ */
+ spin_lock_bh(&ep->ex_lock);
+
+ mp->exches[xid - min_xid] = ep;
+ list_add_tail(&ep->ex_list, &mp->ex_list);
+ fc_seq_alloc(ep, ep->seq_id++);
+ mp->total_exches++;
+ spin_unlock_bh(&mp->em_lock);
+
+ /*
+ * update exchange
+ */
+ ep->oxid = ep->xid = xid;
+ ep->em = mp;
+ ep->lp = mp->lp;
+ ep->f_ctl = FC_FC_FIRST_SEQ; /* next seq is first seq */
+ ep->rxid = FC_XID_UNKNOWN;
+ ep->class = mp->class;
+ INIT_WORK(&ep->timeout_work, fc_exch_timeout, ep);
+out:
+ return ep;
+err:
+ spin_unlock_bh(&mp->em_lock);
+ atomic_inc(&mp->stats.no_free_exch_xid);
+ mempool_free(ep, mp->ep_pool);
+ return NULL;
+}
+EXPORT_SYMBOL(fc_exch_alloc);
+
+/*
+ * Lookup and hold an exchange.
+ */
+static struct fc_exch *fc_exch_find(struct fc_exch_mgr *mp, u16 xid)
+{
+ struct fc_exch *ep = NULL;
+
+ if ((xid >= mp->min_xid) && (xid <= mp->max_xid)) {
+ spin_lock_bh(&mp->em_lock);
+ ep = mp->exches[xid - mp->min_xid];
+ if (ep) {
+ fc_exch_hold(ep);
+ WARN_ON(ep->xid != xid);
+ }
+ spin_unlock_bh(&mp->em_lock);
+ }
+ return ep;
+}
+
+void fc_exch_done(struct fc_seq *sp)
+{
+ struct fc_exch *ep = fc_seq_exch(sp);
+ int rc;
+
+ spin_lock_bh(&ep->ex_lock);
+ rc = fc_exch_done_locked(ep);
+ spin_unlock_bh(&ep->ex_lock);
+ if (!rc)
+ fc_exch_mgr_delete_ep(ep);
+}
+EXPORT_SYMBOL(fc_exch_done);
+
+/*
+ * Allocate a new exchange as responder.
+ * Sets the responder ID in the frame header.
+ */
+static struct fc_exch *fc_exch_resp(struct fc_exch_mgr *mp, struct fc_frame *fp)
+{
+ struct fc_exch *ep;
+ struct fc_frame_header *fh;
+ u16 rxid;
+
+ ep = mp->lp->tt.exch_get(mp->lp, fp);
+ if (ep) {
+ ep->class = fc_frame_class(fp);
+
+ /*
+ * Set EX_CTX indicating we're responding on this exchange.
+ */
+ ep->f_ctl |= FC_FC_EX_CTX; /* we're responding */
+ ep->f_ctl &= ~FC_FC_FIRST_SEQ; /* not new */
+ fh = fc_frame_header_get(fp);
+ ep->sid = ntoh24(fh->fh_d_id);
+ ep->did = ntoh24(fh->fh_s_id);
+ ep->oid = ep->did;
+
+ /*
+ * Allocated exchange has placed the XID in the
+ * originator field. Move it to the responder field,
+ * and set the originator XID from the frame.
+ */
+ ep->rxid = ep->xid;
+ ep->oxid = ntohs(fh->fh_ox_id);
+ ep->esb_stat |= ESB_ST_RESP | ESB_ST_SEQ_INIT;
+ if ((ntoh24(fh->fh_f_ctl) & FC_FC_SEQ_INIT) == 0)
+ ep->esb_stat &= ~ESB_ST_SEQ_INIT;
+
+ /*
+ * Set the responder ID in the frame header.
+ * The old one should've been 0xffff.
+ * If it isn't, don't assign one.
+ * Incoming basic link service frames may specify
+ * a referenced RX_ID.
+ */
+ if (fh->fh_type != FC_TYPE_BLS) {
+ rxid = ntohs(fh->fh_rx_id);
+ WARN_ON(rxid != FC_XID_UNKNOWN);
+ fh->fh_rx_id = htons(ep->rxid);
+ }
+ fc_exch_hold(ep); /* hold for caller */
+ spin_unlock_bh(&ep->ex_lock); /* lock from exch_get */
+ }
+ return ep;
+}
+
+/*
+ * Find a sequence for receive where the other end is originating the sequence.
+ * If fc_pf_rjt_reason is FC_RJT_NONE then this function will have a hold
+ * on the ep that should be released by the caller.
+ */
+static enum fc_pf_rjt_reason
+fc_seq_lookup_recip(struct fc_exch_mgr *mp, struct fc_frame *fp)
+{
+ struct fc_frame_header *fh = fc_frame_header_get(fp);
+ struct fc_exch *ep = NULL;
+ struct fc_seq *sp = NULL;
+ enum fc_pf_rjt_reason reject = FC_RJT_NONE;
+ u32 f_ctl;
+ u16 xid;
+
+ f_ctl = ntoh24(fh->fh_f_ctl);
+ WARN_ON((f_ctl & FC_FC_SEQ_CTX) != 0);
+
+ /*
+ * Lookup or create the exchange if we will be creating the sequence.
+ */
+ if (f_ctl & FC_FC_EX_CTX) {
+ xid = ntohs(fh->fh_ox_id); /* we originated exch */
+ ep = fc_exch_find(mp, xid);
+ if (!ep) {
+ atomic_inc(&mp->stats.xid_not_found);
+ reject = FC_RJT_OX_ID;
+ goto out;
+ }
+ if (ep->rxid == FC_XID_UNKNOWN)
+ ep->rxid = ntohs(fh->fh_rx_id);
+ else if (ep->rxid != ntohs(fh->fh_rx_id)) {
+ reject = FC_RJT_OX_ID;
+ goto rel;
+ }
+ } else {
+ xid = ntohs(fh->fh_rx_id); /* we are the responder */
+
+ /*
+ * Special case for MDS issuing an ELS TEST with a
+ * bad rxid of 0.
+ * XXX take this out once we do the proper reject.
+ */
+ if (xid == 0 && fh->fh_r_ctl == FC_RCTL_ELS_REQ &&
+ fc_frame_payload_op(fp) == ELS_TEST) {
+ fh->fh_rx_id = htons(FC_XID_UNKNOWN);
+ xid = FC_XID_UNKNOWN;
+ }
+
+ /*
+ * new sequence - find the exchange
+ */
+ ep = fc_exch_find(mp, xid);
+ if ((f_ctl & FC_FC_FIRST_SEQ) && fc_sof_is_init(fr_sof(fp))) {
+ if (ep) {
+ atomic_inc(&mp->stats.xid_busy);
+ reject = FC_RJT_RX_ID;
+ goto rel;
+ }
+ ep = fc_exch_resp(mp, fp);
+ if (!ep) {
+ reject = FC_RJT_EXCH_EST; /* XXX */
+ goto out;
+ }
+ xid = ep->xid; /* get our XID */
+ } else if (!ep) {
+ atomic_inc(&mp->stats.xid_not_found);
+ reject = FC_RJT_RX_ID; /* XID not found */
+ goto out;
+ }
+ }
+
+ /*
+ * At this point, we have the exchange held.
+ * Find or create the sequence.
+ */
+ if (fc_sof_is_init(fr_sof(fp))) {
+ sp = fc_seq_start_next(&ep->seq);
+ if (!sp) {
+ reject = FC_RJT_SEQ_XS; /* exchange shortage */
+ goto rel;
+ }
+ sp->id = fh->fh_seq_id;
+ sp->ssb_stat |= SSB_ST_RESP;
+ } else {
+ sp = &ep->seq;
+ if (sp->id != fh->fh_seq_id) {
+ atomic_inc(&mp->stats.seq_not_found);
+ reject = FC_RJT_SEQ_ID; /* sequence/exch should exist */
+ goto rel;
+ }
+ }
+ WARN_ON(ep != fc_seq_exch(sp));
+
+ if (f_ctl & FC_FC_SEQ_INIT)
+ ep->esb_stat |= ESB_ST_SEQ_INIT;
+
+ fr_seq(fp) = sp;
+out:
+ return reject;
+rel:
+ fc_exch_done(&ep->seq);
+ fc_exch_release(ep); /* hold from fc_exch_find/fc_exch_resp */
+ return reject;
+}
+
+/*
+ * Find the sequence for a frame being received.
+ * We originated the sequence, so it should be found.
+ * We may or may not have originated the exchange.
+ * Does not hold the sequence for the caller.
+ */
+static struct fc_seq *fc_seq_lookup_orig(struct fc_exch_mgr *mp,
+ struct fc_frame *fp)
+{
+ struct fc_frame_header *fh = fc_frame_header_get(fp);
+ struct fc_exch *ep;
+ struct fc_seq *sp = NULL;
+ u32 f_ctl;
+ u16 xid;
+
+ f_ctl = ntoh24(fh->fh_f_ctl);
+ WARN_ON((f_ctl & FC_FC_SEQ_CTX) != FC_FC_SEQ_CTX);
+ xid = ntohs((f_ctl & FC_FC_EX_CTX) ? fh->fh_ox_id : fh->fh_rx_id);
+ ep = fc_exch_find(mp, xid);
+ if (!ep)
+ return NULL;
+ if (ep->seq.id == fh->fh_seq_id) {
+ /*
+ * Save the RX_ID if we didn't previously know it.
+ */
+ sp = &ep->seq;
+ if ((f_ctl & FC_FC_EX_CTX) != 0 &&
+ ep->rxid == FC_XID_UNKNOWN) {
+ ep->rxid = ntohs(fh->fh_rx_id);
+ }
+ }
+ fc_exch_release(ep);
+ return sp;
+}
+
+/*
+ * Set addresses for an exchange.
+ * Note this must be done before the first sequence of the exchange is sent.
+ */
+static void fc_exch_set_addr(struct fc_exch *ep,
+ u32 orig_id, u32 resp_id)
+{
+ ep->oid = orig_id;
+ if (ep->esb_stat & ESB_ST_RESP) {
+ ep->sid = resp_id;
+ ep->did = orig_id;
+ } else {
+ ep->sid = orig_id;
+ ep->did = resp_id;
+ }
+}
+
+static struct fc_seq *fc_seq_start_next_locked(struct fc_seq *sp)
+{
+ struct fc_exch *ep = fc_seq_exch(sp);
+
+ sp = fc_seq_alloc(ep, ep->seq_id++);
+ FC_DEBUG_EXCH("exch %4x f_ctl %6x seq %2x f_ctl %6x\n",
+ ep->xid, ep->f_ctl, sp->id, sp->f_ctl);
+ return sp;
+}
+/*
+ * Allocate a new sequence on the same exchange as the supplied sequence.
+ * This will never return NULL.
+ */
+struct fc_seq *fc_seq_start_next(struct fc_seq *sp)
+{
+ struct fc_exch *ep = fc_seq_exch(sp);
+
+ spin_lock_bh(&ep->ex_lock);
+ WARN_ON((ep->esb_stat & ESB_ST_COMPLETE) != 0);
+ sp = fc_seq_start_next_locked(sp);
+ spin_unlock_bh(&ep->ex_lock);
+
+ return sp;
+}
+EXPORT_SYMBOL(fc_seq_start_next);
+
+int fc_seq_send(struct fc_lport *lp, struct fc_seq *sp,
+ struct fc_frame *fp, u32 f_ctl)
+{
+ struct fc_exch *ep;
+ struct fc_frame_header *fh;
+ enum fc_class class;
+ u16 fill = 0;
+ int error;
+
+ ep = fc_seq_exch(sp);
+ WARN_ON((ep->esb_stat & ESB_ST_SEQ_INIT) != ESB_ST_SEQ_INIT);
+
+ fc_seq_fill_hdr(sp, fp);
+ fh = fc_frame_header_get(fp);
+ class = ep->class;
+ fr_sof(fp) = class;
+ if (sp->cnt)
+ fr_sof(fp) = fc_sof_normal(class);
+
+ if (f_ctl & FC_FC_END_SEQ) {
+ fr_eof(fp) = FC_EOF_T;
+ if (fc_sof_needs_ack(class))
+ fr_eof(fp) = FC_EOF_N;
+ /*
+ * Form f_ctl.
+ * The number of fill bytes to make the length a 4-byte
+ * multiple is the low order 2-bits of the f_ctl.
+ * The fill itself will have been cleared by the frame
+ * allocation.
+ * After this, the length will be even, as expected by
+ * the transport. Don't include the fill in the f_ctl
+ * saved in the sequence.
+ */
+ fill = fr_len(fp) & 3;
+ if (fill) {
+ fill = 4 - fill;
+ /* TODO, this may be a problem with fragmented skb */
+ skb_put(fp_skb(fp), fill);
+ }
+ f_ctl |= sp->f_ctl | ep->f_ctl;
+ } else {
+ WARN_ON(fr_len(fp) % 4 != 0); /* no pad to non last frame */
+ f_ctl |= sp->f_ctl | ep->f_ctl;
+ f_ctl &= ~FC_FC_SEQ_INIT;
+ fr_eof(fp) = FC_EOF_N;
+ }
+
+ hton24(fh->fh_f_ctl, f_ctl | fill);
+ fh->fh_seq_cnt = htons(sp->cnt);
+
+ /*
+ * update sequence count if this frame is carrying
+ * multiple FC frames when sequence offload is enabled
+ * by LLD.
+ */
+ if (fr_max_payload(fp))
+ sp->cnt += DIV_ROUND_UP((fr_len(fp) - sizeof(*fh)),
+ fr_max_payload(fp));
+ else
+ sp->cnt++;
+
+ /*
+ * Send the frame.
+ */
+ error = lp->tt.frame_send(lp, fp);
+
+ /*
+ * Update the exchange and sequence flags,
+ * assuming all frames for the sequence have been sent.
+ * We can only be called to send once for each sequence.
+ */
+ spin_lock_bh(&ep->ex_lock);
+ sp->f_ctl = f_ctl; /* save for possible abort */
+ ep->f_ctl &= ~FC_FC_FIRST_SEQ; /* not first seq */
+ if (f_ctl & FC_FC_END_SEQ) {
+ if (f_ctl & FC_FC_SEQ_INIT)
+ ep->esb_stat &= ~ESB_ST_SEQ_INIT;
+ }
+ spin_unlock_bh(&ep->ex_lock);
+ return error;
+}
+EXPORT_SYMBOL(fc_seq_send);
+
+void fc_seq_els_rsp_send(struct fc_seq *sp, enum fc_els_cmd els_cmd,
+ struct fc_seq_els_data *els_data)
+{
+ switch (els_cmd) {
+ case ELS_LS_RJT:
+ fc_seq_ls_rjt(sp, els_data->reason, els_data->explan);
+ break;
+ case ELS_LS_ACC:
+ fc_seq_ls_acc(sp);
+ break;
+ case ELS_RRQ:
+ fc_exch_els_rrq(sp, els_data->fp);
+ break;
+ case ELS_REC:
+ fc_exch_els_rec(sp, els_data->fp);
+ break;
+ default:
+ FC_DBG("Invalid ELS CMD:%x\n", els_cmd);
+ }
+}
+EXPORT_SYMBOL(fc_seq_els_rsp_send);
+
+/*
+ * Send a sequence, which is also the last sequence in the exchange.
+ */
+static void fc_seq_send_last(struct fc_seq *sp, struct fc_frame *fp,
+ enum fc_rctl rctl, enum fc_fh_type fh_type)
+{
+ u32 f_ctl;
+
+ fc_frame_setup(fp, rctl, fh_type);
+ f_ctl = FC_FC_SEQ_INIT | FC_FC_LAST_SEQ | FC_FC_END_SEQ;
+ fc_seq_send(fc_seq_exch(sp)->lp, sp, fp, f_ctl);
+}
+
+/*
+ * Send ACK_1 (or equiv.) indicating we received something.
+ * The frame we're acking is supplied.
+ */
+static void fc_seq_send_ack(struct fc_seq *sp, const struct fc_frame *rx_fp)
+{
+ struct fc_frame *fp;
+ struct fc_frame_header *rx_fh;
+ struct fc_frame_header *fh;
+ struct fc_lport *lp = fc_seq_exch(sp)->lp;
+ unsigned int f_ctl;
+
+ /*
+ * Don't send ACKs for class 3.
+ */
+ if (fc_sof_needs_ack(fr_sof(rx_fp))) {
+ fp = fc_frame_alloc(lp, 0);
+ BUG_ON(!fp);
+ if (!fp)
+ return;
+
+ fc_seq_fill_hdr(sp, fp);
+ fh = fc_frame_header_get(fp);
+ fh->fh_r_ctl = FC_RCTL_ACK_1;
+ fh->fh_type = FC_TYPE_BLS;
+
+ /*
+ * Form f_ctl by inverting EX_CTX and SEQ_CTX (bits 23, 22).
+ * Echo FIRST_SEQ, LAST_SEQ, END_SEQ, END_CONN, SEQ_INIT.
+ * Bits 9-8 are meaningful (retransmitted or unidirectional).
+ * Last ACK uses bits 7-6 (continue sequence),
+ * bits 5-4 are meaningful (what kind of ACK to use).
+ */
+ rx_fh = fc_frame_header_get(rx_fp);
+ f_ctl = ntoh24(rx_fh->fh_f_ctl);
+ f_ctl &= FC_FC_EX_CTX | FC_FC_SEQ_CTX |
+ FC_FC_FIRST_SEQ | FC_FC_LAST_SEQ |
+ FC_FC_END_SEQ | FC_FC_END_CONN | FC_FC_SEQ_INIT |
+ FC_FC_RETX_SEQ | FC_FC_UNI_TX;
+ f_ctl ^= FC_FC_EX_CTX | FC_FC_SEQ_CTX;
+ hton24(fh->fh_f_ctl, f_ctl);
+
+ fh->fh_seq_id = rx_fh->fh_seq_id;
+ fh->fh_seq_cnt = rx_fh->fh_seq_cnt;
+ fh->fh_parm_offset = htonl(1); /* ack single frame */
+
+ fr_sof(fp) = fr_sof(rx_fp);
+ if (f_ctl & FC_FC_END_SEQ)
+ fr_eof(fp) = FC_EOF_T;
+ else
+ fr_eof(fp) = FC_EOF_N;
+
+ (void) lp->tt.frame_send(lp, fp);
+ }
+}
+
+/*
+ * Send BLS Reject.
+ * This is for rejecting BA_ABTS only.
+ */
+static void
+fc_exch_send_ba_rjt(struct fc_frame *rx_fp, enum fc_ba_rjt_reason reason,
+ enum fc_ba_rjt_explan explan)
+{
+ struct fc_frame *fp;
+ struct fc_frame_header *rx_fh;
+ struct fc_frame_header *fh;
+ struct fc_ba_rjt *rp;
+ struct fc_lport *lp;
+ unsigned int f_ctl;
+
+ lp = fr_dev(rx_fp);
+ fp = fc_frame_alloc(lp, sizeof(*rp));
+ if (!fp)
+ return;
+ fh = fc_frame_header_get(fp);
+ rx_fh = fc_frame_header_get(rx_fp);
+
+ memset(fh, 0, sizeof(*fh) + sizeof(*rp));
+
+ rp = fc_frame_payload_get(fp, sizeof(*rp));
+ rp->br_reason = reason;
+ rp->br_explan = explan;
+
+ /*
+ * seq_id, cs_ctl, df_ctl and param/offset are zero.
+ */
+ memcpy(fh->fh_s_id, rx_fh->fh_d_id, 3);
+ memcpy(fh->fh_d_id, rx_fh->fh_s_id, 3);
+ fh->fh_ox_id = rx_fh->fh_rx_id;
+ fh->fh_rx_id = rx_fh->fh_ox_id;
+ fh->fh_seq_cnt = rx_fh->fh_seq_cnt;
+ fh->fh_r_ctl = FC_RCTL_BA_RJT;
+ fh->fh_type = FC_TYPE_BLS;
+
+ /*
+ * Form f_ctl by inverting EX_CTX and SEQ_CTX (bits 23, 22).
+ * Echo FIRST_SEQ, LAST_SEQ, END_SEQ, END_CONN, SEQ_INIT.
+ * Bits 9-8 are meaningful (retransmitted or unidirectional).
+ * Last ACK uses bits 7-6 (continue sequence),
+ * bits 5-4 are meaningful (what kind of ACK to use).
+ * Always set LAST_SEQ, END_SEQ.
+ */
+ f_ctl = ntoh24(rx_fh->fh_f_ctl);
+ f_ctl &= FC_FC_EX_CTX | FC_FC_SEQ_CTX |
+ FC_FC_END_CONN | FC_FC_SEQ_INIT |
+ FC_FC_RETX_SEQ | FC_FC_UNI_TX;
+ f_ctl ^= FC_FC_EX_CTX | FC_FC_SEQ_CTX;
+ f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ;
+ f_ctl &= ~FC_FC_FIRST_SEQ;
+ hton24(fh->fh_f_ctl, f_ctl);
+
+ fr_sof(fp) = fc_sof_class(fr_sof(rx_fp));
+ fr_eof(fp) = FC_EOF_T;
+ if (fc_sof_needs_ack(fr_sof(fp)))
+ fr_eof(fp) = FC_EOF_N;
+
+ (void) lp->tt.frame_send(lp, fp);
+}
+
+/*
+ * Handle an incoming ABTS. This would be for target mode usually,
+ * but could be due to lost FCP transfer ready, confirm or RRQ.
+ * We always handle this as an exchange abort, ignoring the parameter.
+ */
+static void fc_exch_recv_abts(struct fc_exch *ep, struct fc_frame *rx_fp)
+{
+ struct fc_frame *fp;
+ struct fc_ba_acc *ap;
+ struct fc_frame_header *fh;
+ struct fc_seq *sp;
+
+ if (!ep)
+ goto reject;
+ spin_lock_bh(&ep->ex_lock);
+ if (ep->esb_stat & ESB_ST_COMPLETE) {
+ spin_unlock_bh(&ep->ex_lock);
+ goto reject;
+ }
+ if (!(ep->esb_stat & ESB_ST_REC_QUAL))
+ fc_exch_hold(ep); /* hold for REC_QUAL */
+ ep->esb_stat |= ESB_ST_ABNORMAL | ESB_ST_REC_QUAL;
+ fc_exch_timer_set_locked(ep, ep->r_a_tov);
+
+ fp = fc_frame_alloc(ep->lp, sizeof(*ap));
+ if (!fp) {
+ spin_unlock_bh(&ep->ex_lock);
+ goto free;
+ }
+ fh = fc_frame_header_get(fp);
+ ap = fc_frame_payload_get(fp, sizeof(*ap));
+ memset(ap, 0, sizeof(*ap));
+ sp = &ep->seq;
+ ap->ba_high_seq_cnt = htons(0xffff);
+ if (sp->ssb_stat & SSB_ST_RESP) {
+ ap->ba_seq_id = sp->id;
+ ap->ba_seq_id_val = FC_BA_SEQ_ID_VAL;
+ ap->ba_high_seq_cnt = fh->fh_seq_cnt;
+ ap->ba_low_seq_cnt = htons(sp->cnt);
+ }
+ sp = fc_seq_start_next(sp);
+ spin_unlock_bh(&ep->ex_lock);
+ fc_seq_send_last(sp, fp, FC_RCTL_BA_ACC, FC_TYPE_BLS);
+ fc_frame_free(rx_fp);
+ return;
+
+reject:
+ fc_exch_send_ba_rjt(rx_fp, FC_BA_RJT_UNABLE, FC_BA_RJT_INV_XID);
+free:
+ fc_frame_free(rx_fp);
+}
+
+/*
+ * Handle receive where the other end is originating the sequence.
+ */
+static void fc_exch_recv_req(struct fc_lport *lp, struct fc_exch_mgr *mp,
+ struct fc_frame *fp)
+{
+ struct fc_frame_header *fh = fc_frame_header_get(fp);
+ struct fc_seq *sp = NULL;
+ struct fc_exch *ep = NULL;
+ enum fc_sof sof;
+ enum fc_eof eof;
+ u32 f_ctl;
+ enum fc_pf_rjt_reason reject;
+
+ fr_seq(fp) = NULL;
+ reject = fc_seq_lookup_recip(mp, fp);
+ if (reject == FC_RJT_NONE) {
+ sp = fr_seq(fp); /* sequence will be held */
+ ep = fc_seq_exch(sp);
+ sof = fr_sof(fp);
+ eof = fr_eof(fp);
+ f_ctl = ntoh24(fh->fh_f_ctl);
+ fc_seq_send_ack(sp, fp);
+
+ /*
+ * Call the receive function.
+ *
+ * The receive function may allocate a new sequence
+ * over the old one, so we shouldn't change the
+ * sequence after this.
+ *
+ * The frame will be freed by the receive function.
+ * If new exch resp handler is valid then call that
+ * first.
+ */
+ if (ep->resp)
+ ep->resp(sp, fp, ep->arg);
+ else
+ lp->tt.lport_recv(lp, sp, fp);
+ fc_exch_release(ep); /* release from lookup */
+ } else {
+ FC_DEBUG_EXCH("exch/seq lookup failed: reject %x\n", reject);
+ fc_frame_free(fp);
+ }
+}
+
+/*
+ * Handle receive where the other end is originating the sequence in
+ * response to our exchange.
+ */
+static void fc_exch_recv_seq_resp(struct fc_exch_mgr *mp, struct fc_frame *fp)
+{
+ struct fc_frame_header *fh = fc_frame_header_get(fp);
+ struct fc_seq *sp;
+ struct fc_exch *ep;
+ enum fc_sof sof;
+ u32 f_ctl;
+ void (*resp)(struct fc_seq *, struct fc_frame *fp, void *arg);
+ void *ex_resp_arg;
+ int rc;
+
+ ep = fc_exch_find(mp, ntohs(fh->fh_ox_id));
+ if (!ep) {
+ atomic_inc(&mp->stats.xid_not_found);
+ goto out;
+ }
+ if (ep->rxid == FC_XID_UNKNOWN)
+ ep->rxid = ntohs(fh->fh_rx_id);
+ if (ep->sid != 0 && ep->sid != ntoh24(fh->fh_d_id)) {
+ atomic_inc(&mp->stats.xid_not_found);
+ goto rel;
+ }
+ if (ep->did != ntoh24(fh->fh_s_id) &&
+ ep->did != FC_FID_FLOGI) {
+ atomic_inc(&mp->stats.xid_not_found);
+ goto rel;
+ }
+ sof = fr_sof(fp);
+ if (fc_sof_is_init(sof)) {
+ sp = fc_seq_start_next(&ep->seq);
+ sp->id = fh->fh_seq_id;
+ sp->ssb_stat |= SSB_ST_RESP;
+ } else {
+ sp = &ep->seq;
+ if (sp->id != fh->fh_seq_id) {
+ atomic_inc(&mp->stats.seq_not_found);
+ goto rel;
+ }
+ }
+ f_ctl = ntoh24(fh->fh_f_ctl);
+ fr_seq(fp) = sp;
+ if (f_ctl & FC_FC_SEQ_INIT)
+ ep->esb_stat |= ESB_ST_SEQ_INIT;
+
+ if (fc_sof_needs_ack(sof))
+ fc_seq_send_ack(sp, fp);
+ resp = ep->resp;
+ ex_resp_arg = ep->arg;
+
+ if (fh->fh_type != FC_TYPE_FCP && fr_eof(fp) == FC_EOF_T &&
+ (f_ctl & (FC_FC_LAST_SEQ | FC_FC_END_SEQ)) ==
+ (FC_FC_LAST_SEQ | FC_FC_END_SEQ)) {
+ spin_lock_bh(&ep->ex_lock);
+ rc = fc_exch_done_locked(ep);
+ WARN_ON(fc_seq_exch(sp) != ep);
+ spin_unlock_bh(&ep->ex_lock);
+ if (!rc)
+ fc_exch_mgr_delete_ep(ep);
+ }
+
+ /*
+ * Call the receive function.
+ * The sequence is held (has a refcnt) for us,
+ * but not for the receive function.
+ *
+ * The receive function may allocate a new sequence
+ * over the old one, so we shouldn't change the
+ * sequence after this.
+ *
+ * The frame will be freed by the receive function.
+ * If new exch resp handler is valid then call that
+ * first.
+ */
+ if (resp)
+ resp(sp, fp, ex_resp_arg);
+ else
+ fc_frame_free(fp);
+ fc_exch_release(ep);
+ return;
+rel:
+ fc_exch_release(ep);
+out:
+ fc_frame_free(fp);
+}
+
+/*
+ * Handle receive for a sequence where other end is responding to our sequence.
+ */
+static void fc_exch_recv_resp(struct fc_exch_mgr *mp, struct fc_frame *fp)
+{
+ struct fc_seq *sp;
+
+ sp = fc_seq_lookup_orig(mp, fp); /* doesn't hold sequence */
+ if (!sp) {
+ atomic_inc(&mp->stats.xid_not_found);
+ FC_DEBUG_EXCH("seq lookup failed\n");
+ } else {
+ atomic_inc(&mp->stats.non_bls_resp);
+ FC_DEBUG_EXCH("non-BLS response to sequence");
+ }
+ fc_frame_free(fp);
+}
+
+/*
+ * Handle the response to an ABTS for exchange or sequence.
+ * This can be BA_ACC or BA_RJT.
+ */
+static void fc_exch_abts_resp(struct fc_exch *ep, struct fc_frame *fp)
+{
+ void (*resp)(struct fc_seq *, struct fc_frame *fp, void *arg);
+ void *ex_resp_arg;
+ struct fc_frame_header *fh;
+ struct fc_ba_acc *ap;
+ struct fc_seq *sp;
+ u16 low;
+ u16 high;
+ int rc = 1, has_rec = 0;
+
+ fh = fc_frame_header_get(fp);
+ FC_DEBUG_EXCH("exch: BLS rctl %x - %s\n",
+ fh->fh_r_ctl, fc_exch_rctl_name(fh->fh_r_ctl));
+
+ if (cancel_delayed_work(&ep->timeout_work))
+ fc_exch_release(ep); /* release from pending timer hold */
+ else
+ flush_scheduled_work();
+
+ spin_lock_bh(&ep->ex_lock);
+ switch (fh->fh_r_ctl) {
+ case FC_RCTL_BA_ACC:
+ ap = fc_frame_payload_get(fp, sizeof(*ap));
+ if (!ap)
+ break;
+
+ /*
+ * Decide whether to establish a Recovery Qualifier.
+ * We do this if there is a non-empty SEQ_CNT range and
+ * SEQ_ID is the same as the one we aborted.
+ */
+ low = ntohs(ap->ba_low_seq_cnt);
+ high = ntohs(ap->ba_high_seq_cnt);
+ if ((ep->esb_stat & ESB_ST_REC_QUAL) == 0 &&
+ (ap->ba_seq_id_val != FC_BA_SEQ_ID_VAL ||
+ ap->ba_seq_id == ep->seq_id) && low != high) {
+ ep->esb_stat |= ESB_ST_REC_QUAL;
+ fc_exch_hold(ep); /* hold for recovery qualifier */
+ has_rec = 1;
+ }
+ break;
+ case FC_RCTL_BA_RJT:
+ break;
+ default:
+ break;
+ }
+
+ resp = ep->resp;
+ ex_resp_arg = ep->arg;
+
+ /* do we need to do some other checks here. Can we reuse more of
+ * fc_exch_recv_seq_resp
+ */
+ sp = &ep->seq;
+ /*
+ * do we want to check END_SEQ as well as LAST_SEQ here?
+ */
+ if (ep->fh_type != FC_TYPE_FCP &&
+ ntoh24(fh->fh_f_ctl) & FC_FC_LAST_SEQ)
+ rc = fc_exch_done_locked(ep);
+ spin_unlock_bh(&ep->ex_lock);
+ if (!rc)
+ fc_exch_mgr_delete_ep(ep);
+
+ if (resp)
+ resp(sp, fp, ex_resp_arg);
+ else
+ fc_frame_free(fp);
+
+ if (has_rec)
+ fc_exch_timer_set(ep, ep->r_a_tov);
+
+}
+
+/*
+ * Receive BLS sequence.
+ * This is always a sequence initiated by the remote side.
+ * We may be either the originator or recipient of the exchange.
+ */
+static void fc_exch_recv_bls(struct fc_exch_mgr *mp, struct fc_frame *fp)
+{
+ struct fc_frame_header *fh;
+ struct fc_exch *ep;
+ u32 f_ctl;
+
+ fh = fc_frame_header_get(fp);
+ f_ctl = ntoh24(fh->fh_f_ctl);
+ fr_seq(fp) = NULL;
+
+ ep = fc_exch_find(mp, (f_ctl & FC_FC_EX_CTX) ?
+ ntohs(fh->fh_ox_id) : ntohs(fh->fh_rx_id));
+ if (ep && (f_ctl & FC_FC_SEQ_INIT)) {
+ spin_lock_bh(&ep->ex_lock);
+ ep->esb_stat |= ESB_ST_SEQ_INIT;
+ spin_unlock_bh(&ep->ex_lock);
+ }
+ if (f_ctl & FC_FC_SEQ_CTX) {
+ /*
+ * A response to a sequence we initiated.
+ * This should only be ACKs for class 2 or F.
+ */
+ switch (fh->fh_r_ctl) {
+ case FC_RCTL_ACK_1:
+ case FC_RCTL_ACK_0:
+ break;
+ default:
+ FC_DEBUG_EXCH("BLS rctl %x - %s received",
+ fh->fh_r_ctl,
+ fc_exch_rctl_name(fh->fh_r_ctl));
+ break;
+ }
+ fc_frame_free(fp);
+ } else {
+ switch (fh->fh_r_ctl) {
+ case FC_RCTL_BA_RJT:
+ case FC_RCTL_BA_ACC:
+ if (ep)
+ fc_exch_abts_resp(ep, fp);
+ else
+ fc_frame_free(fp);
+ break;
+ case FC_RCTL_BA_ABTS:
+ fc_exch_recv_abts(ep, fp);
+ break;
+ default: /* ignore junk */
+ fc_frame_free(fp);
+ break;
+ }
+ }
+ if (ep)
+ fc_exch_release(ep); /* release hold taken by fc_exch_find */
+}
+
+/*
+ * Accept sequence with LS_ACC.
+ * If this fails due to allocation or transmit congestion, assume the
+ * originator will repeat the sequence.
+ */
+static void fc_seq_ls_acc(struct fc_seq *req_sp)
+{
+ struct fc_seq *sp;
+ struct fc_els_ls_acc *acc;
+ struct fc_frame *fp;
+
+ sp = fc_seq_start_next(req_sp);
+ fp = fc_frame_alloc(fc_seq_exch(sp)->lp, sizeof(*acc));
+ if (fp) {
+ acc = fc_frame_payload_get(fp, sizeof(*acc));
+ memset(acc, 0, sizeof(*acc));
+ acc->la_cmd = ELS_LS_ACC;
+ fc_seq_send_last(sp, fp, FC_RCTL_ELS_REP, FC_TYPE_ELS);
+ }
+}
+
+/*
+ * Reject sequence with ELS LS_RJT.
+ * If this fails due to allocation or transmit congestion, assume the
+ * originator will repeat the sequence.
+ */
+static void fc_seq_ls_rjt(struct fc_seq *req_sp, enum fc_els_rjt_reason reason,
+ enum fc_els_rjt_explan explan)
+{
+ struct fc_seq *sp;
+ struct fc_els_ls_rjt *rjt;
+ struct fc_frame *fp;
+
+ sp = fc_seq_start_next(req_sp);
+ fp = fc_frame_alloc(fc_seq_exch(sp)->lp, sizeof(*rjt));
+ if (fp) {
+ rjt = fc_frame_payload_get(fp, sizeof(*rjt));
+ memset(rjt, 0, sizeof(*rjt));
+ rjt->er_cmd = ELS_LS_RJT;
+ rjt->er_reason = reason;
+ rjt->er_explan = explan;
+ fc_seq_send_last(sp, fp, FC_RCTL_ELS_REP, FC_TYPE_ELS);
+ }
+}
+
+static void fc_exch_reset(struct fc_exch *ep)
+{
+ struct fc_seq *sp;
+ void (*resp)(struct fc_seq *, struct fc_frame *, void *);
+ void *arg;
+ int rc = 1;
+
+ spin_lock_bh(&ep->ex_lock);
+ ep->state |= FC_EX_RST_CLEANUP;
+ /*
+ * we really want to call del_timer_sync, but cannot due
+ * to the lport calling with the lport lock held (some resp
+ * functions can also grab the lport lock which could cause
+ * a deadlock).
+ */
+ if (cancel_delayed_work(&ep->timeout_work))
+ atomic_dec(&ep->ex_refcnt); /* drop hold for timer */
+
+ resp = ep->resp;
+ ep->resp = NULL;
+ if (ep->esb_stat & ESB_ST_REC_QUAL)
+ atomic_dec(&ep->ex_refcnt); /* drop hold for rec_qual */
+ ep->esb_stat &= ~ESB_ST_REC_QUAL;
+ arg = ep->arg;
+ sp = &ep->seq;
+ rc = fc_exch_done_locked(ep);
+ spin_unlock_bh(&ep->ex_lock);
+ if (!rc)
+ fc_exch_mgr_delete_ep(ep);
+
+ if (resp)
+ resp(sp, ERR_PTR(-FC_EX_CLOSED), arg);
+}
+
+/*
+ * Reset an exchange manager, releasing all sequences and exchanges.
+ * If sid is non-zero, reset only exchanges we source from that FID.
+ * If did is non-zero, reset only exchanges destined to that FID.
+ */
+void fc_exch_mgr_reset(struct fc_exch_mgr *mp, u32 sid, u32 did)
+{
+ struct fc_exch *ep;
+ struct fc_exch *next;
+
+ spin_lock_bh(&mp->em_lock);
+restart:
+ list_for_each_entry_safe(ep, next, &mp->ex_list, ex_list) {
+ if ((sid == 0 || sid == ep->sid) &&
+ (did == 0 || did == ep->did)) {
+ fc_exch_hold(ep);
+ spin_unlock_bh(&mp->em_lock);
+
+ fc_exch_reset(ep);
+
+ fc_exch_release(ep);
+ spin_lock_bh(&mp->em_lock);
+
+ /*
+ * must restart loop incase while lock was down
+ * multiple eps were released.
+ */
+ goto restart;
+ }
+ }
+ spin_unlock_bh(&mp->em_lock);
+}
+EXPORT_SYMBOL(fc_exch_mgr_reset);
+
+void fc_seq_get_xids(struct fc_seq *sp, u16 *oxid, u16 *rxid)
+{
+ struct fc_exch *ep;
+
+ ep = fc_seq_exch(sp);
+ *oxid = ep->oxid;
+ *rxid = ep->rxid;
+}
+EXPORT_SYMBOL(fc_seq_get_xids);
+
+void fc_seq_set_rec_data(struct fc_seq *sp, u32 rec_data)
+{
+ sp->rec_data = rec_data;
+}
+EXPORT_SYMBOL(fc_seq_set_rec_data);
+
+/*
+ * Handle incoming ELS REC - Read Exchange Concise.
+ * Note that the requesting port may be different than the S_ID in the request.
+ */
+static void fc_exch_els_rec(struct fc_seq *sp, struct fc_frame *rfp)
+{
+ struct fc_frame *fp;
+ struct fc_exch *ep;
+ struct fc_exch_mgr *em;
+ struct fc_els_rec *rp;
+ struct fc_els_rec_acc *acc;
+ enum fc_els_rjt_reason reason = ELS_RJT_LOGIC;
+ enum fc_els_rjt_explan explan;
+ u32 sid;
+ u16 rxid;
+ u16 oxid;
+
+ rp = fc_frame_payload_get(rfp, sizeof(*rp));
+ explan = ELS_EXPL_INV_LEN;
+ if (!rp)
+ goto reject;
+ sid = ntoh24(rp->rec_s_id);
+ rxid = ntohs(rp->rec_rx_id);
+ oxid = ntohs(rp->rec_ox_id);
+
+ /*
+ * Currently it's hard to find the local S_ID from the exchange
+ * manager. This will eventually be fixed, but for now it's easier
+ * to lookup the subject exchange twice, once as if we were
+ * the initiator, and then again if we weren't.
+ */
+ em = fc_seq_exch(sp)->em;
+ ep = fc_exch_find(em, oxid);
+ explan = ELS_EXPL_OXID_RXID;
+ if (ep && ep->oid == sid) {
+ if (ep->rxid != FC_XID_UNKNOWN &&
+ rxid != FC_XID_UNKNOWN &&
+ ep->rxid != rxid)
+ goto rel;
+ } else {
+ if (ep)
+ fc_exch_release(ep);
+ ep = NULL;
+ if (rxid != FC_XID_UNKNOWN)
+ ep = fc_exch_find(em, rxid);
+ if (!ep)
+ goto reject;
+ }
+
+ fp = fc_frame_alloc(fc_seq_exch(sp)->lp, sizeof(*acc));
+ if (!fp) {
+ fc_exch_done(sp);
+ goto out;
+ }
+ sp = fc_seq_start_next(sp);
+ acc = fc_frame_payload_get(fp, sizeof(*acc));
+ memset(acc, 0, sizeof(*acc));
+ acc->reca_cmd = ELS_LS_ACC;
+ acc->reca_ox_id = rp->rec_ox_id;
+ memcpy(acc->reca_ofid, rp->rec_s_id, 3);
+ acc->reca_rx_id = htons(ep->rxid);
+ if (ep->sid == ep->oid)
+ hton24(acc->reca_rfid, ep->did);
+ else
+ hton24(acc->reca_rfid, ep->sid);
+ acc->reca_fc4value = htonl(ep->seq.rec_data);
+ acc->reca_e_stat = htonl(ep->esb_stat & (ESB_ST_RESP |
+ ESB_ST_SEQ_INIT |
+ ESB_ST_COMPLETE));
+ sp = fc_seq_start_next(sp);
+ fc_seq_send_last(sp, fp, FC_RCTL_ELS_REP, FC_TYPE_ELS);
+out:
+ fc_exch_release(ep);
+ fc_frame_free(rfp);
+ return;
+
+rel:
+ fc_exch_release(ep);
+reject:
+ fc_seq_ls_rjt(sp, reason, explan);
+ fc_frame_free(rfp);
+}
+
+/*
+ * Handle response from RRQ.
+ * Not much to do here, really.
+ * Should report errors.
+ *
+ * TODO: fix error handler.
+ */
+static void fc_exch_rrq_resp(struct fc_seq *sp, struct fc_frame *fp, void *arg)
+{
+ struct fc_exch *aborted_ep = arg;
+ unsigned int op;
+
+ if (IS_ERR(fp)) {
+ int err = PTR_ERR(fp);
+
+ if (err == -FC_EX_CLOSED)
+ goto cleanup;
+ FC_DBG("Cannot process RRQ, because of frame error %d\n", err);
+ return;
+ }
+
+ op = fc_frame_payload_op(fp);
+ fc_frame_free(fp);
+
+ switch (op) {
+ case ELS_LS_RJT:
+ FC_DBG("LS_RJT for RRQ");
+ /* fall through */
+ case ELS_LS_ACC:
+ goto cleanup;
+ default:
+ FC_DBG("unexpected response op %x for RRQ", op);
+ return;
+ }
+
+cleanup:
+ fc_exch_done(&aborted_ep->seq);
+ /* drop hold for rec qual */
+ fc_exch_release(aborted_ep);
+}
+
+/*
+ * Send ELS RRQ - Reinstate Recovery Qualifier.
+ * This tells the remote port to stop blocking the use of
+ * the exchange and the seq_cnt range.
+ */
+static void fc_exch_rrq(struct fc_exch *ep)
+{
+ struct fc_lport *lp;
+ struct fc_els_rrq *rrq;
+ struct fc_frame *fp;
+ struct fc_seq *rrq_sp;
+ u32 did;
+
+ lp = ep->lp;
+
+ fp = fc_frame_alloc(lp, sizeof(*rrq));
+ if (!fp)
+ return;
+ fc_frame_setup(fp, FC_RCTL_ELS_REQ, FC_TYPE_ELS);
+ rrq = fc_frame_payload_get(fp, sizeof(*rrq));
+ memset(rrq, 0, sizeof(*rrq));
+ rrq->rrq_cmd = ELS_RRQ;
+ hton24(rrq->rrq_s_id, ep->sid);
+ rrq->rrq_ox_id = htons(ep->oxid);
+ rrq->rrq_rx_id = htons(ep->rxid);
+
+ did = ep->did;
+ if (ep->esb_stat & ESB_ST_RESP)
+ did = ep->sid;
+ rrq_sp = fc_exch_seq_send(lp, fp, fc_exch_rrq_resp, NULL, ep,
+ lp->e_d_tov, fc_host_port_id(lp->host), did,
+ FC_FC_SEQ_INIT | FC_FC_END_SEQ);
+ if (!rrq_sp) {
+ ep->esb_stat |= ESB_ST_REC_QUAL;
+ fc_exch_timer_set_locked(ep, ep->r_a_tov);
+ return;
+ }
+}
+
+
+/*
+ * Handle incoming ELS RRQ - Reset Recovery Qualifier.
+ */
+static void fc_exch_els_rrq(struct fc_seq *sp, struct fc_frame *fp)
+{
+ struct fc_exch *ep; /* request or subject exchange */
+ struct fc_els_rrq *rp;
+ u32 sid;
+ u16 xid;
+ enum fc_els_rjt_explan explan;
+
+ rp = fc_frame_payload_get(fp, sizeof(*rp));
+ explan = ELS_EXPL_INV_LEN;
+ if (!rp)
+ goto reject;
+
+ /*
+ * lookup subject exchange.
+ */
+ ep = fc_seq_exch(sp);
+ sid = ntoh24(rp->rrq_s_id); /* subject source */
+ xid = ep->did == sid ? ntohs(rp->rrq_ox_id) : ntohs(rp->rrq_rx_id);
+ ep = fc_exch_find(ep->em, xid);
+
+ explan = ELS_EXPL_OXID_RXID;
+ if (!ep)
+ goto reject;
+ spin_lock_bh(&ep->ex_lock);
+ if (ep->oxid != ntohs(rp->rrq_ox_id))
+ goto unlock_reject;
+ if (ep->rxid != ntohs(rp->rrq_rx_id) &&
+ ep->rxid != FC_XID_UNKNOWN)
+ goto unlock_reject;
+ explan = ELS_EXPL_SID;
+ if (ep->sid != sid)
+ goto unlock_reject;
+
+ /*
+ * Clear Recovery Qualifier state, and cancel timer if complete.
+ */
+ if (ep->esb_stat & ESB_ST_REC_QUAL) {
+ ep->esb_stat &= ~ESB_ST_REC_QUAL;
+ atomic_dec(&ep->ex_refcnt); /* drop hold for rec qual */
+ }
+ if (ep->esb_stat & ESB_ST_COMPLETE) {
+ if (cancel_delayed_work(&ep->timeout_work))
+ atomic_dec(&ep->ex_refcnt); /* drop hold for timer */
+ }
+
+ spin_unlock_bh(&ep->ex_lock);
+
+ /*
+ * Send LS_ACC.
+ */
+ fc_seq_ls_acc(sp);
+ fc_frame_free(fp);
+ return;
+
+unlock_reject:
+ spin_unlock_bh(&ep->ex_lock);
+ fc_exch_release(ep); /* drop hold from fc_exch_find */
+reject:
+ fc_seq_ls_rjt(sp, ELS_RJT_LOGIC, explan);
+ fc_frame_free(fp);
+}
+
+struct fc_exch_mgr *fc_exch_mgr_alloc(struct fc_lport *lp,
+ enum fc_class class,
+ u16 min_xid, u16 max_xid)
+{
+ struct fc_exch_mgr *mp;
+ size_t len;
+
+ if (max_xid <= min_xid || min_xid == 0 || max_xid == FC_XID_UNKNOWN) {
+ FC_DBG("Invalid min_xid 0x:%x and max_xid 0x:%x\n",
+ min_xid, max_xid);
+ return NULL;
+ }
+
+ /*
+ * Memory need for EM
+ */
+ len = (max_xid - min_xid + 1) * (sizeof(struct fc_exch *));
+ len += sizeof(struct fc_exch_mgr);
+
+ mp = kzalloc(len, GFP_ATOMIC);
+ if (mp) {
+ mp->class = class;
+ mp->total_exches = 0;
+ mp->exches = (struct fc_exch **)(mp + 1);
+ mp->last_xid = min_xid - 1;
+ mp->min_xid = min_xid;
+ mp->max_xid = max_xid;
+ mp->lp = lp;
+ INIT_LIST_HEAD(&mp->ex_list);
+ spin_lock_init(&mp->em_lock);
+ }
+
+ mp->ep_pool = mempool_create_slab_pool(2, fc_em_cachep);
+ if (!mp->ep_pool)
+ goto free_mp;
+
+ return mp;
+
+free_mp:
+ kfree(mp);
+ return NULL;
+}
+EXPORT_SYMBOL(fc_exch_mgr_alloc);
+
+void fc_exch_mgr_free(struct fc_exch_mgr *mp)
+{
+ WARN_ON(!mp);
+ /*
+ * The total exch count must be zero
+ * before freeing exchange manager.
+ */
+ WARN_ON(mp->total_exches != 0);
+ mempool_destroy(mp->ep_pool);
+ kfree(mp);
+}
+EXPORT_SYMBOL(fc_exch_mgr_free);
+
+struct fc_exch *fc_exch_get(struct fc_lport *lp, struct fc_frame *fp)
+{
+ if (!lp || !lp->emp)
+ return NULL;
+ return fc_exch_alloc(lp->emp, 0);
+}
+EXPORT_SYMBOL(fc_exch_get);
+
+struct fc_seq *fc_exch_seq_send(struct fc_lport *lp,
+ struct fc_frame *fp,
+ void (*resp)(struct fc_seq *,
+ struct fc_frame *fp,
+ void *arg),
+ void (*destructor)(struct fc_seq *, void *),
+ void *arg, u32 timer_msec,
+ u32 sid, u32 did, u32 f_ctl)
+{
+ struct fc_exch *ep;
+ struct fc_seq *sp = NULL;
+ struct fc_frame_header *fh;
+ u16 fill;
+ int rc = 1;
+
+ ep = lp->tt.exch_get(lp, fp);
+ if (!ep) {
+ fc_frame_free(fp);
+ return NULL;
+ }
+ ep->esb_stat |= ESB_ST_SEQ_INIT;
+ fc_exch_set_addr(ep, sid, did);
+ ep->resp = resp;
+ ep->destructor = destructor;
+ ep->arg = arg;
+ ep->r_a_tov = FC_DEF_R_A_TOV;
+ ep->lp = lp;
+ sp = &ep->seq;
+ WARN_ON((sp->f_ctl & FC_FC_END_SEQ) != 0);
+
+ fr_sof(fp) = ep->class;
+ if (sp->cnt)
+ fr_sof(fp) = fc_sof_normal(ep->class);
+ fr_eof(fp) = FC_EOF_T;
+ if (fc_sof_needs_ack(ep->class))
+ fr_eof(fp) = FC_EOF_N;
+
+ fc_seq_fill_hdr(sp, fp);
+ /*
+ * Form f_ctl.
+ * The number of fill bytes to make the length a 4-byte multiple is
+ * the low order 2-bits of the f_ctl. The fill itself will have been
+ * cleared by the frame allocation.
+ * After this, the length will be even, as expected by the transport.
+ * Don't include the fill in the f_ctl saved in the sequence.
+ */
+ fill = fr_len(fp) & 3;
+ if (fill) {
+ fill = 4 - fill;
+ /* TODO, this may be a problem with fragmented skb */
+ skb_put(fp_skb(fp), fill);
+ }
+ f_ctl |= ep->f_ctl;
+ fh = fc_frame_header_get(fp);
+ hton24(fh->fh_f_ctl, f_ctl | fill);
+ fh->fh_seq_cnt = htons(sp->cnt++);
+ ep->fh_type = fh->fh_type; /* save for possbile timeout handling */
+
+ if (unlikely(lp->tt.frame_send(lp, fp)))
+ goto err;
+
+ if (timer_msec)
+ fc_exch_timer_set_locked(ep, timer_msec);
+ sp->f_ctl = f_ctl; /* save for possible abort */
+ ep->f_ctl &= ~FC_FC_FIRST_SEQ; /* not first seq */
+
+ if (f_ctl & FC_FC_SEQ_INIT)
+ ep->esb_stat &= ~ESB_ST_SEQ_INIT;
+ spin_unlock_bh(&ep->ex_lock);
+ return sp;
+err:
+ rc = fc_exch_done_locked(ep);
+ spin_unlock_bh(&ep->ex_lock);
+ if (!rc)
+ fc_exch_mgr_delete_ep(ep);
+ return NULL;
+}
+EXPORT_SYMBOL(fc_exch_seq_send);
+
+/*
+ * Receive a frame
+ */
+void fc_exch_recv(struct fc_lport *lp, struct fc_exch_mgr *mp,
+ struct fc_frame *fp)
+{
+ struct fc_frame_header *fh = fc_frame_header_get(fp);
+ u32 f_ctl;
+
+ /* lport lock ? */
+ if (!lp || !mp || (lp->state == LPORT_ST_NONE)) {
+ FC_DBG("fc_lport or EM is not allocated and configured");
+ fc_frame_free(fp);
+ return;
+ }
+
+ /*
+ * If frame is marked invalid, just drop it.
+ */
+ f_ctl = ntoh24(fh->fh_f_ctl);
+ switch (fr_eof(fp)) {
+ case FC_EOF_T:
+ if (f_ctl & FC_FC_END_SEQ)
+ skb_trim(fp_skb(fp), fr_len(fp) - FC_FC_FILL(f_ctl));
+ /* fall through */
+ case FC_EOF_N:
+ if (fh->fh_type == FC_TYPE_BLS)
+ fc_exch_recv_bls(mp, fp);
+ else if ((f_ctl & (FC_FC_EX_CTX | FC_FC_SEQ_CTX)) ==
+ FC_FC_EX_CTX)
+ fc_exch_recv_seq_resp(mp, fp);
+ else if (f_ctl & FC_FC_SEQ_CTX)
+ fc_exch_recv_resp(mp, fp);
+ else
+ fc_exch_recv_req(lp, mp, fp);
+ break;
+ default:
+ FC_DBG("dropping invalid frame (eof %x)", fr_eof(fp));
+ fc_frame_free(fp);
+ break;
+ }
+}
+EXPORT_SYMBOL(fc_exch_recv);
+
+int fc_exch_init(struct fc_lport *lp)
+{
+ if (!lp->tt.exch_get) {
+ /*
+ * exch_put() should be NULL if
+ * exch_get() is NULL
+ */
+ WARN_ON(lp->tt.exch_put);
+ lp->tt.exch_get = fc_exch_get;
+ }
+
+ if (!lp->tt.seq_start_next)
+ lp->tt.seq_start_next = fc_seq_start_next;
+
+ if (!lp->tt.exch_seq_send)
+ lp->tt.exch_seq_send = fc_exch_seq_send;
+
+ if (!lp->tt.seq_send)
+ lp->tt.seq_send = fc_seq_send;
+
+ if (!lp->tt.seq_els_rsp_send)
+ lp->tt.seq_els_rsp_send = fc_seq_els_rsp_send;
+
+ if (!lp->tt.exch_done)
+ lp->tt.exch_done = fc_exch_done;
+
+ if (!lp->tt.exch_mgr_reset)
+ lp->tt.exch_mgr_reset = fc_exch_mgr_reset;
+
+ if (!lp->tt.seq_exch_abort)
+ lp->tt.seq_exch_abort = fc_seq_exch_abort;
+
+ if (!lp->tt.seq_get_xids)
+ lp->tt.seq_get_xids = fc_seq_get_xids;
+
+ if (!lp->tt.seq_set_rec_data)
+ lp->tt.seq_set_rec_data = fc_seq_set_rec_data;
+ return 0;
+}
+EXPORT_SYMBOL(fc_exch_init);
+
+int fc_setup_exch_mgr(void)
+{
+ fc_em_cachep = kmem_cache_create("libfc_em", sizeof(struct fc_exch),
+ 0, SLAB_HWCACHE_ALIGN, NULL, NULL);
+ if (!fc_em_cachep)
+ return -ENOMEM;
+ return 0;
+}
+
+void fc_destroy_exch_mgr(void)
+{
+ kmem_cache_destroy(fc_em_cachep);
+}
diff --git a/drivers/scsi/libfc/fc_fcp.c b/drivers/scsi/libfc/fc_fcp.c
new file mode 100644
index 0000000..248ea7b
--- /dev/null
+++ b/drivers/scsi/libfc/fc_fcp.c
@@ -0,0 +1,2241 @@
+/*
+ * Copyright(c) 2007 Intel Corporation. All rights reserved.
+ * Copyright(c) 2008 Red Hat, Inc. All rights reserved.
+ * Copyright(c) 2008 Mike Christie
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Maintained at www.Open-FCoE.org
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/spinlock.h>
+#include <linux/scatterlist.h>
+#include <linux/err.h>
+#include <linux/crc32.h>
+#include <linux/delay.h>
+
+#include <scsi/scsi_tcq.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_cmnd.h>
+
+#include <scsi/fc/fc_fc2.h>
+
+#include <scsi/libfc/libfc.h>
+
+MODULE_AUTHOR("Open-FCoE.org");
+MODULE_DESCRIPTION("libfc");
+MODULE_LICENSE("GPL");
+
+static int fc_fcp_debug;
+
+#define FC_DEBUG_FCP(fmt...) \
+ do { \
+ if (fc_fcp_debug) \
+ FC_DBG(fmt); \
+ } while (0)
+
+static struct kmem_cache *scsi_pkt_cachep;
+
+/* SRB state definitions */
+#define FC_SRB_FREE 0 /* cmd is free */
+#define FC_SRB_CMD_SENT (1 << 0) /* cmd has been sent */
+#define FC_SRB_RCV_STATUS (1 << 1) /* response has arrived */
+#define FC_SRB_ABORT_PENDING (1 << 2) /* cmd abort sent to device */
+#define FC_SRB_ABORTED (1 << 3) /* abort acknowleged */
+#define FC_SRB_DISCONTIG (1 << 4) /* non-sequential data recvd */
+#define FC_SRB_COMPL (1 << 5) /* fc_io_compl has been run */
+#define FC_SRB_FCP_PROCESSING_TMO (1 << 6) /* timer function processing */
+#define FC_SRB_NOMEM (1 << 7) /* dropped to out of mem */
+
+#define FC_SRB_READ (1 << 1)
+#define FC_SRB_WRITE (1 << 0)
+
+/*
+ * scsi request structure, one for each scsi request
+ */
+struct fc_fcp_pkt {
+ /*
+ * housekeeping stuff
+ */
+ struct fc_lport *lp; /* handle to hba struct */
+ u16 state; /* scsi_pkt state state */
+ u16 tgt_flags; /* target flags */
+ atomic_t ref_cnt; /* only used byr REC ELS */
+ spinlock_t scsi_pkt_lock; /* Must be taken before the host lock
+ * if both are held at the same time */
+ /*
+ * SCSI I/O related stuff
+ */
+ struct scsi_cmnd *cmd; /* scsi command pointer. set/clear
+ * under host lock */
+ struct list_head list; /* tracks queued commands. access under
+ * host lock */
+ /*
+ * timeout related stuff
+ */
+ struct timer_list timer; /* command timer */
+ struct completion tm_done;
+ int wait_for_comp;
+ unsigned long start_time; /* start jiffie */
+ unsigned long end_time; /* end jiffie */
+ unsigned long last_pkt_time; /* jiffies of last frame received */
+
+ /*
+ * scsi cmd and data transfer information
+ */
+ u32 data_len;
+ /*
+ * transport related veriables
+ */
+ struct fcp_cmnd cdb_cmd;
+ size_t xfer_len;
+ u32 xfer_contig_end; /* offset of end of contiguous xfer */
+ u16 max_payload; /* max payload size in bytes */
+
+ /*
+ * scsi/fcp return status
+ */
+ u32 io_status; /* SCSI result upper 24 bits */
+ u8 cdb_status;
+ u8 status_code; /* FCP I/O status */
+ /* bit 3 Underrun bit 2: overrun */
+ u8 scsi_comp_flags;
+ u32 req_flags; /* bit 0: read bit:1 write */
+ u32 scsi_resid; /* residule length */
+
+ struct fc_rport *rport; /* remote port pointer */
+ struct fc_seq *seq_ptr; /* current sequence pointer */
+ /*
+ * Error Processing
+ */
+ u8 recov_retry; /* count of recovery retries */
+ struct fc_seq *recov_seq; /* sequence for REC or SRR */
+};
+
+/*
+ * The SCp.ptr should be tested and set under the host lock. NULL indicates
+ * that the command has been retruned to the scsi layer.
+ */
+#define CMD_SP(Cmnd) ((struct fc_fcp_pkt *)(Cmnd)->SCp.ptr)
+#define CMD_ENTRY_STATUS(Cmnd) ((Cmnd)->SCp.have_data_in)
+#define CMD_COMPL_STATUS(Cmnd) ((Cmnd)->SCp.this_residual)
+#define CMD_SCSI_STATUS(Cmnd) ((Cmnd)->SCp.Status)
+#define CMD_RESID_LEN(Cmnd) ((Cmnd)->SCp.buffers_residual)
+
+struct fc_fcp_internal {
+ mempool_t *scsi_pkt_pool;
+ struct list_head scsi_pkt_queue;
+ u8 throttled;
+};
+
+#define fc_get_scsi_internal(x) ((struct fc_fcp_internal *)(x)->scsi_priv)
+
+/*
+ * function prototypes
+ * FC scsi I/O related functions
+ */
+static void fc_fcp_recv_data(struct fc_fcp_pkt *, struct fc_frame *);
+static void fc_fcp_recv(struct fc_seq *, struct fc_frame *, void *);
+static void fc_fcp_resp(struct fc_fcp_pkt *, struct fc_frame *);
+static void fc_fcp_complete(struct fc_fcp_pkt *);
+static void fc_tm_done(struct fc_seq *, struct fc_frame *, void *);
+static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp);
+static void fc_timeout_error(struct fc_fcp_pkt *);
+static int fc_fcp_send_cmd(struct fc_fcp_pkt *);
+static void fc_fcp_timeout(unsigned long data);
+static void fc_fcp_rec(struct fc_fcp_pkt *);
+static void fc_fcp_rec_error(struct fc_fcp_pkt *, struct fc_frame *);
+static void fc_fcp_rec_resp(struct fc_seq *, struct fc_frame *, void *);
+static void fc_io_compl(struct fc_fcp_pkt *);
+
+static void fc_fcp_srr(struct fc_fcp_pkt *, enum fc_rctl, u32);
+static void fc_fcp_srr_resp(struct fc_seq *, struct fc_frame *, void *);
+static void fc_fcp_srr_error(struct fc_fcp_pkt *, struct fc_frame *);
+
+/*
+ * command status codes
+ */
+#define FC_COMPLETE 0
+#define FC_CMD_ABORTED 1
+#define FC_CMD_RESET 2
+#define FC_CMD_PLOGO 3
+#define FC_SNS_RCV 4
+#define FC_TRANS_ERR 5
+#define FC_DATA_OVRRUN 6
+#define FC_DATA_UNDRUN 7
+#define FC_ERROR 8
+#define FC_HRD_ERROR 9
+#define FC_CMD_TIME_OUT 10
+
+/*
+ * Error recovery timeout values.
+ */
+#define FC_SCSI_ER_TIMEOUT (10 * HZ)
+#define FC_SCSI_TM_TOV (10 * HZ)
+#define FC_SCSI_REC_TOV (2 * HZ)
+#define FC_HOST_RESET_TIMEOUT (30 * HZ)
+
+#define FC_MAX_ERROR_CNT 5
+#define FC_MAX_RECOV_RETRY 3
+
+#define FC_FCP_DFLT_QUEUE_DEPTH 32
+
+/**
+ * fc_fcp_pkt_alloc - allocation routine for scsi_pkt packet
+ * @lp: fc lport struct
+ * @gfp: gfp flags for allocation
+ *
+ * This is used by upper layer scsi driver.
+ * Return Value : scsi_pkt structure or null on allocation failure.
+ * Context : call from process context. no locking required.
+ */
+static struct fc_fcp_pkt *fc_fcp_pkt_alloc(struct fc_lport *lp, gfp_t gfp)
+{
+ struct fc_fcp_internal *si = fc_get_scsi_internal(lp);
+ struct fc_fcp_pkt *sp;
+
+ sp = mempool_alloc(si->scsi_pkt_pool, gfp);
+ if (sp) {
+ memset(sp, 0, sizeof(*sp));
+ sp->lp = lp;
+ atomic_set(&sp->ref_cnt, 1);
+ init_timer(&sp->timer);
+ INIT_LIST_HEAD(&sp->list);
+ spin_lock_init(&sp->scsi_pkt_lock);
+ }
+ return sp;
+}
+
+/**
+ * fc_fcp_pkt_release - release hold on scsi_pkt packet
+ * @sp: fcp packet struct
+ *
+ * This is used by upper layer scsi driver.
+ * Context : call from process and interrupt context.
+ * no locking required
+ */
+static void fc_fcp_pkt_release(struct fc_fcp_pkt *sp)
+{
+ if (atomic_dec_and_test(&sp->ref_cnt)) {
+ struct fc_fcp_internal *si = fc_get_scsi_internal(sp->lp);
+
+ mempool_free(sp, si->scsi_pkt_pool);
+ }
+}
+
+static void fc_fcp_pkt_hold(struct fc_fcp_pkt *sp)
+{
+ atomic_inc(&sp->ref_cnt);
+}
+
+/**
+ * fc_fcp_pkt_destory - release hold on scsi_pkt packet
+ *
+ * @sp: exchange sequence
+ * @fsp: fcp packet struct
+ *
+ * Release hold on scsi_pkt packet set to keep scsi_pkt
+ * till EM layer exch resource is not freed.
+ * Context : called from from EM layer.
+ * no locking required
+ */
+static void fc_fcp_pkt_destroy(struct fc_seq *sp, void *arg)
+{
+ fc_fcp_pkt_release(arg);
+}
+
+/**
+ * fc_fcp_lock_pkt - lock a packet and get a ref to it.
+ * @fsp: fcp packet
+ *
+ * We should only return error if we return a command to scsi-ml before
+ * getting a response. This can happen in cases where we send a abort, but
+ * do not wait for the response and the abort and command can be passing
+ * each other on the wire/network-layer.
+ *
+ * Note: this function locks the packet and gets a reference to allow
+ * callers to call the completion function while the lock is held and
+ * not have to worry about the packets refcount.
+ *
+ * TODO: Maybe we should just have callers grab/release the lock and
+ * have a function that they call to verify the fsp and grab a ref if
+ * needed.
+ */
+static inline int fc_fcp_lock_pkt(struct fc_fcp_pkt *fsp)
+{
+ spin_lock_bh(&fsp->scsi_pkt_lock);
+ if (!fsp->cmd) {
+ spin_unlock_bh(&fsp->scsi_pkt_lock);
+ FC_DBG("Invalid scsi cmd pointer on fcp packet.\n");
+ return -EINVAL;
+ }
+
+ fc_fcp_pkt_hold(fsp);
+ return 0;
+}
+
+static inline void fc_fcp_unlock_pkt(struct fc_fcp_pkt *fsp)
+{
+ spin_unlock_bh(&fsp->scsi_pkt_lock);
+ fc_fcp_pkt_release(fsp);
+}
+
+static void fc_fcp_timer_set(struct fc_fcp_pkt *fsp, unsigned long delay)
+{
+ if (!(fsp->state & FC_SRB_COMPL))
+ mod_timer(&fsp->timer, jiffies + delay);
+}
+
+static int fc_fcp_send_abort(struct fc_fcp_pkt *fsp)
+{
+ if (!fsp->seq_ptr)
+ return -EINVAL;
+
+ fsp->state |= FC_SRB_ABORT_PENDING;
+ return fsp->lp->tt.seq_exch_abort(fsp->seq_ptr, 0);
+}
+
+/*
+ * Retry command.
+ * An abort isn't needed.
+ */
+static void fc_fcp_retry_cmd(struct fc_fcp_pkt *fsp)
+{
+ if (fsp->seq_ptr) {
+ fsp->lp->tt.exch_done(fsp->seq_ptr);
+ fsp->seq_ptr = NULL;
+ }
+
+ fsp->state &= ~FC_SRB_ABORT_PENDING;
+ fsp->io_status = SUGGEST_RETRY << 24;
+ fsp->status_code = FC_ERROR;
+ fc_fcp_complete(fsp);
+}
+
+#define for_each_sg(sglist, __sg, nr, __i) \
+ for (__i = 0, __sg = (sglist); __i < (nr); __i++, __sg = sg_next(__sg))
+
+static inline struct scatterlist *sg_next(struct scatterlist *sg)
+{
+ if (!sg)
+ return NULL;
+ return sg + 1;
+}
+
+static inline struct page *sg_page(struct scatterlist *sg)
+{
+ return sg->page;
+}
+
+/*
+ * Receive SCSI data from target.
+ * Called after receiving solicited data.
+ */
+static void fc_fcp_recv_data(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
+{
+ struct scsi_cmnd *sc = fsp->cmd;
+ struct fc_lport *lp = fsp->lp;
+ struct fcoe_dev_stats *sp;
+ struct fc_frame_header *fh;
+ size_t start_offset;
+ size_t offset;
+ u32 crc;
+ u32 copy_len = 0;
+ size_t len;
+ void *buf;
+ struct scatterlist *sg;
+ size_t remaining;
+ int i = 0;
+
+ fh = fc_frame_header_get(fp);
+ offset = ntohl(fh->fh_parm_offset);
+ start_offset = offset;
+ len = fr_len(fp) - sizeof(*fh);
+ buf = fc_frame_payload_get(fp, 0);
+
+ if (offset + len > fsp->data_len) {
+ /*
+ * this should never happen
+ */
+ if ((fr_flags(fp) & FCPHF_CRC_UNCHECKED) &&
+ fc_frame_crc_check(fp))
+ goto crc_err;
+ FC_DEBUG_FCP("data received past end. len %zx offset %zx "
+ "data_len %x\n", len, offset, fsp->data_len);
+ fc_fcp_retry_cmd(fsp);
+ return;
+ }
+ if (offset != fsp->xfer_len)
+ fsp->state |= FC_SRB_DISCONTIG;
+
+ crc = 0;
+ if (fr_flags(fp) & FCPHF_CRC_UNCHECKED)
+ crc = crc32(~0, (u8 *) fh, sizeof(*fh));
+
+ sg = scsi_sglist(sc);
+ remaining = len;
+
+ while (remaining > 0 && i < scsi_sg_count(sc)) {
+ size_t off;
+ void *page_addr;
+ size_t sg_bytes;
+
+ if (offset >= sg->length) {
+ offset -= sg->length;
+ sg = sg_next(sg);
+ i++;
+ continue;
+ }
+ sg_bytes = min(remaining, sg->length - offset);
+
+ /*
+ * The scatterlist item may be bigger than PAGE_SIZE,
+ * but we are limited to mapping PAGE_SIZE at a time.
+ */
+ off = offset + sg->offset;
+ sg_bytes = min(sg_bytes, (size_t)
+ (PAGE_SIZE - (off & ~PAGE_MASK)));
+ page_addr = kmap_atomic(sg_page(sg) + (off >> PAGE_SHIFT),
+ KM_SOFTIRQ0);
+ if (!page_addr)
+ break; /* XXX panic? */
+
+ if (fr_flags(fp) & FCPHF_CRC_UNCHECKED)
+ crc = crc32(crc, buf, sg_bytes);
+ memcpy((char *)page_addr + (off & ~PAGE_MASK), buf,
+ sg_bytes);
+
+ kunmap_atomic(page_addr, KM_SOFTIRQ0);
+ buf += sg_bytes;
+ offset += sg_bytes;
+ remaining -= sg_bytes;
+ copy_len += sg_bytes;
+ }
+
+ if (fr_flags(fp) & FCPHF_CRC_UNCHECKED) {
+ buf = fc_frame_payload_get(fp, 0);
+ if (len % 4) {
+ crc = crc32(crc, buf + len, 4 - (len % 4));
+ len += 4 - (len % 4);
+ }
+
+ if (~crc != le32_to_cpu(*(__le32 *)(buf + len))) {
+crc_err:
+ sp = lp->dev_stats[smp_processor_id()];
+ sp->ErrorFrames++;
+ if (sp->InvalidCRCCount++ < 5)
+ FC_DBG("CRC error on data frame\n");
+ /*
+ * Assume the frame is total garbage.
+ * We may have copied it over the good part
+ * of the buffer.
+ * If so, we need to retry the entire operation.
+ * Otherwise, ignore it.
+ */
+ if (fsp->state & FC_SRB_DISCONTIG)
+ fc_fcp_retry_cmd(fsp);
+ return;
+ }
+ }
+
+ if (fsp->xfer_contig_end == start_offset)
+ fsp->xfer_contig_end += copy_len;
+ fsp->xfer_len += copy_len;
+
+ /*
+ * In the very rare event that this data arrived after the response
+ * and completes the transfer, call the completion handler.
+ */
+ if (unlikely(fsp->state & FC_SRB_RCV_STATUS) &&
+ fsp->xfer_len == fsp->data_len - fsp->scsi_resid)
+ fc_fcp_complete(fsp);
+}
+
+/*
+ * Send SCSI data to target.
+ * Called after receiving a Transfer Ready data descriptor.
+ * if LLD is capable of seq offload then send down seq_blen
+ * size of data in single frame, otherwise send multiple FC
+ * frames of max FC frame payload supported by target port.
+ */
+static int fc_fcp_send_data(struct fc_fcp_pkt *fsp, struct fc_seq *sp,
+ size_t offset, size_t seq_blen)
+{
+ struct scsi_cmnd *sc;
+ struct scatterlist *sg;
+ struct fc_frame *fp = NULL;
+ struct fc_lport *lp = fsp->lp;
+ size_t remaining;
+ size_t t_blen;
+ size_t tlen;
+ size_t sg_bytes;
+ size_t frame_offset;
+ int error;
+ void *data = NULL;
+ void *page_addr;
+ int using_sg = lp->sg_supp;
+ u32 f_ctl;
+ int i;
+
+ WARN_ON(seq_blen <= 0);
+ if (unlikely(offset + seq_blen > fsp->data_len)) {
+ /* this should never happen */
+ FC_DEBUG_FCP("xfer-ready past end. seq_blen %zx offset %zx\n",
+ seq_blen, offset);
+ fc_fcp_send_abort(fsp);
+ return 0;
+ } else if (offset != fsp->xfer_len) {
+ /* Out of Order Data Request - no problem, but unexpected. */
+ FC_DEBUG_FCP("xfer-ready non-contiguous. "
+ "seq_blen %zx offset %zx\n", seq_blen, offset);
+ }
+
+ /*
+ * if LLD is capable of seq_offload then set transport
+ * burst length (t_blen) to seq_blen, otherwise set t_blen
+ * to max FC frame payload previously set in fsp->max_payload.
+ */
+ t_blen = lp->seq_offload ? seq_blen : fsp->max_payload;
+ WARN_ON(t_blen < FC_MIN_MAX_PAYLOAD);
+ if (t_blen > 512)
+ t_blen &= ~(512 - 1); /* round down to block size */
+ WARN_ON(t_blen < FC_MIN_MAX_PAYLOAD); /* won't go below 256 */
+ sc = fsp->cmd;
+
+ remaining = seq_blen;
+ frame_offset = offset;
+ tlen = 0;
+ sp = lp->tt.seq_start_next(sp);
+ f_ctl = FC_FC_REL_OFF;
+ WARN_ON(!sp);
+
+ /*
+ * If a get_page()/put_page() will fail, don't use sg lists
+ * in the fc_frame structure.
+ *
+ * The put_page() may be long after the I/O has completed
+ * in the case of FCoE, since the network driver does it
+ * via free_skb(). See the test in free_pages_check().
+ *
+ * Test this case with 'dd </dev/zero >/dev/st0 bs=64k'.
+ */
+ if (using_sg) {
+ for_each_sg(scsi_sglist(sc), sg, scsi_sg_count(sc), i) {
+ if (page_count(sg_page(sg)) == 0 ||
+ (sg_page(sg)->flags & (1 << PG_lru |
+ 1 << PG_private |
+ 1 << PG_locked |
+ 1 << PG_active |
+ 1 << PG_slab |
+ 1 << PG_swapcache |
+ 1 << PG_writeback |
+ 1 << PG_reserved |
+ 1 << PG_buddy))) {
+ using_sg = 0;
+ break;
+ }
+ }
+ }
+ sg = scsi_sglist(sc);
+ i = 0;
+
+ while (remaining > 0 && i < scsi_sg_count(sc)) {
+ if (offset >= sg->length) {
+ offset -= sg->length;
+ sg = sg_next(sg);
+ i++;
+ continue;
+ }
+ if (!fp) {
+ tlen = min(t_blen, remaining);
+
+ /*
+ * TODO. Temporary workaround. fc_seq_send() can't
+ * handle odd lengths in non-linear skbs.
+ * This will be the final fragment only.
+ */
+ if (tlen % 4)
+ using_sg = 0;
+ if (using_sg) {
+ fp = _fc_frame_alloc(lp, 0);
+ if (!fp)
+ return -ENOMEM;
+ } else {
+ fp = fc_frame_alloc(lp, tlen);
+ if (!fp)
+ return -ENOMEM;
+
+ data = (void *)(fr_hdr(fp)) +
+ sizeof(struct fc_frame_header);
+ }
+ fc_frame_setup(fp, FC_RCTL_DD_SOL_DATA, FC_TYPE_FCP);
+ fc_frame_set_offset(fp, frame_offset);
+ fr_max_payload(fp) = fsp->max_payload;
+ }
+ sg_bytes = min(tlen, sg->length - offset);
+ if (using_sg) {
+ WARN_ON(skb_shinfo(fp_skb(fp))->nr_frags >
+ FC_FRAME_SG_LEN);
+ get_page(sg_page(sg));
+ skb_fill_page_desc(fp_skb(fp),
+ skb_shinfo(fp_skb(fp))->nr_frags,
+ sg_page(sg), sg->offset + offset,
+ sg_bytes);
+ fp_skb(fp)->data_len += sg_bytes;
+ fr_len(fp) += sg_bytes;
+ fp_skb(fp)->truesize += PAGE_SIZE;
+ } else {
+ size_t off = offset + sg->offset;
+
+ /*
+ * The scatterlist item may be bigger than PAGE_SIZE,
+ * but we must not cross pages inside the kmap.
+ */
+ sg_bytes = min(sg_bytes, (size_t) (PAGE_SIZE -
+ (off & ~PAGE_MASK)));
+ page_addr = kmap_atomic(sg_page(sg) +
+ (off >> PAGE_SHIFT),
+ KM_SOFTIRQ0);
+ memcpy(data, (char *)page_addr + (off & ~PAGE_MASK),
+ sg_bytes);
+ kunmap_atomic(page_addr, KM_SOFTIRQ0);
+ data += sg_bytes;
+ }
+ offset += sg_bytes;
+ frame_offset += sg_bytes;
+ tlen -= sg_bytes;
+ remaining -= sg_bytes;
+
+ if (remaining == 0) {
+ /*
+ * Send a request sequence with
+ * transfer sequence initiative.
+ */
+ f_ctl |= FC_FC_SEQ_INIT | FC_FC_END_SEQ;
+ error = lp->tt.seq_send(lp, sp, fp, f_ctl);
+ } else if (tlen == 0) {
+ /*
+ * send fragment using for a sequence.
+ */
+ error = lp->tt.seq_send(lp, sp, fp, f_ctl);
+ } else {
+ continue;
+ }
+ fp = NULL;
+
+ if (error) {
+ WARN_ON(1); /* send error should be rare */
+ fc_fcp_retry_cmd(fsp);
+ return 0;
+ }
+ }
+ fsp->xfer_len += seq_blen; /* premature count? */
+ return 0;
+}
+
+static void fc_fcp_abts_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
+{
+ int ba_done = 1;
+ struct fc_ba_rjt *brp;
+ struct fc_frame_header *fh;
+
+ fh = fc_frame_header_get(fp);
+ switch (fh->fh_r_ctl) {
+ case FC_RCTL_BA_ACC:
+ break;
+ case FC_RCTL_BA_RJT:
+ brp = fc_frame_payload_get(fp, sizeof(*brp));
+ if (brp && brp->br_reason == FC_BA_RJT_LOG_ERR)
+ break;
+ /* fall thru */
+ default:
+ /*
+ * we will let the command timeout
+ * and scsi-ml recover in this case,
+ * therefore cleared the ba_done flag.
+ */
+ ba_done = 0;
+ }
+
+ if (ba_done) {
+ fsp->state |= FC_SRB_ABORTED;
+ fsp->state &= ~FC_SRB_ABORT_PENDING;
+
+ if (fsp->wait_for_comp)
+ complete(&fsp->tm_done);
+ else
+ fc_fcp_complete(fsp);
+ }
+}
+
+/*
+ * fc_fcp_reduce_can_queue - drop can_queue
+ * @lp: lport to drop queueing for
+ *
+ * If we are getting memory allocation failures, then we may
+ * be trying to execute too many commands. We let the running
+ * commands complete or timeout, then try again with a reduced
+ * can_queue. Eventually we will hit the point where we run
+ * on all reserved structs.
+ */
+static void fc_fcp_reduce_can_queue(struct fc_lport *lp)
+{
+ struct fc_fcp_internal *si = fc_get_scsi_internal(lp);
+ unsigned long flags;
+ int can_queue;
+
+ spin_lock_irqsave(lp->host->host_lock, flags);
+ if (si->throttled)
+ goto done;
+ si->throttled = 1;
+
+ can_queue = lp->host->can_queue;
+ can_queue >>= 1;
+ if (!can_queue)
+ can_queue = 1;
+ lp->host->can_queue = can_queue;
+ shost_printk(KERN_ERR, lp->host, "Could not allocate frame.\n"
+ "Reducing can_queue to %d.\n", can_queue);
+done:
+ spin_unlock_irqrestore(lp->host->host_lock, flags);
+}
+
+/*
+ * exch mgr calls this routine to process scsi
+ * exchanges.
+ *
+ * Return : None
+ * Context : called from Soft IRQ context
+ * can not called holding list lock
+ */
+static void fc_fcp_recv(struct fc_seq *sp, struct fc_frame *fp, void *arg)
+{
+ struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg;
+ struct fc_lport *lp;
+ struct fc_frame_header *fh;
+ struct fcp_txrdy *dd;
+ u8 r_ctl;
+ int rc = 0;
+
+ if (IS_ERR(fp))
+ goto errout;
+
+ fh = fc_frame_header_get(fp);
+ r_ctl = fh->fh_r_ctl;
+ lp = fsp->lp;
+
+ if (!(lp->state & LPORT_ST_READY))
+ goto out;
+ if (fc_fcp_lock_pkt(fsp))
+ goto out;
+ fsp->last_pkt_time = jiffies;
+
+ if (fh->fh_type == FC_TYPE_BLS) {
+ fc_fcp_abts_resp(fsp, fp);
+ goto unlock;
+ }
+
+ if (fsp->state & (FC_SRB_ABORTED | FC_SRB_ABORT_PENDING))
+ goto unlock;
+
+ if (r_ctl == FC_RCTL_DD_DATA_DESC) {
+ /*
+ * received XFER RDY from the target
+ * need to send data to the target
+ */
+ WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED);
+ dd = fc_frame_payload_get(fp, sizeof(*dd));
+ WARN_ON(!dd);
+
+ rc = fc_fcp_send_data(fsp, sp,
+ (size_t) ntohl(dd->ft_data_ro),
+ (size_t) ntohl(dd->ft_burst_len));
+ if (!rc)
+ lp->tt.seq_set_rec_data(sp, fsp->xfer_len);
+ else if (rc == -ENOMEM)
+ fsp->state |= FC_SRB_NOMEM;
+ } else if (r_ctl == FC_RCTL_DD_SOL_DATA) {
+ /*
+ * received a DATA frame
+ * next we will copy the data to the system buffer
+ */
+ WARN_ON(fr_len(fp) < sizeof(*fh)); /* len may be 0 */
+ fc_fcp_recv_data(fsp, fp);
+ lp->tt.seq_set_rec_data(sp, fsp->xfer_contig_end);
+ } else if (r_ctl == FC_RCTL_DD_CMD_STATUS) {
+ WARN_ON(fr_flags(fp) & FCPHF_CRC_UNCHECKED);
+
+ fc_fcp_resp(fsp, fp);
+ } else {
+ FC_DBG("unexpected frame. r_ctl %x\n", r_ctl);
+ }
+unlock:
+ fc_fcp_unlock_pkt(fsp);
+out:
+ fc_frame_free(fp);
+errout:
+ if (IS_ERR(fp))
+ fc_fcp_error(fsp, fp);
+ else if (rc == -ENOMEM)
+ fc_fcp_reduce_can_queue(lp);
+}
+
+static void fc_fcp_resp(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
+{
+ struct fc_frame_header *fh;
+ struct fcp_resp *fc_rp;
+ struct fcp_resp_ext *rp_ex;
+ struct fcp_resp_rsp_info *fc_rp_info;
+ u32 plen;
+ u32 expected_len;
+ u32 respl = 0;
+ u32 snsl = 0;
+ u8 flags = 0;
+
+ plen = fr_len(fp);
+ fh = (struct fc_frame_header *)fr_hdr(fp);
+ if (unlikely(plen < sizeof(*fh) + sizeof(*fc_rp)))
+ goto len_err;
+ plen -= sizeof(*fh);
+ fc_rp = (struct fcp_resp *)(fh + 1);
+ fsp->cdb_status = fc_rp->fr_status;
+ flags = fc_rp->fr_flags;
+ fsp->scsi_comp_flags = flags;
+ expected_len = fsp->data_len;
+
+ if (unlikely((flags & ~FCP_CONF_REQ) || fc_rp->fr_status)) {
+ rp_ex = (void *)(fc_rp + 1);
+ if (flags & (FCP_RSP_LEN_VAL | FCP_SNS_LEN_VAL)) {
+ if (plen < sizeof(*fc_rp) + sizeof(*rp_ex))
+ goto len_err;
+ fc_rp_info = (struct fcp_resp_rsp_info *)(rp_ex + 1);
+ if (flags & FCP_RSP_LEN_VAL) {
+ respl = ntohl(rp_ex->fr_rsp_len);
+ if (respl != sizeof(*fc_rp_info))
+ goto len_err;
+ if (fsp->wait_for_comp) {
+ /* Abuse cdb_status for rsp code */
+ fsp->cdb_status = fc_rp_info->rsp_code;
+ complete(&fsp->tm_done);
+ /*
+ * tmfs will not have any scsi cmd so
+ * exit here
+ */
+ return;
+ } else
+ goto err;
+ }
+ if (flags & FCP_SNS_LEN_VAL) {
+ snsl = ntohl(rp_ex->fr_sns_len);
+ if (snsl > SCSI_SENSE_BUFFERSIZE)
+ snsl = SCSI_SENSE_BUFFERSIZE;
+ memcpy(fsp->cmd->sense_buffer,
+ (char *)fc_rp_info + respl, snsl);
+ }
+ }
+ if (flags & (FCP_RESID_UNDER | FCP_RESID_OVER)) {
+ if (plen < sizeof(*fc_rp) + sizeof(rp_ex->fr_resid))
+ goto len_err;
+ if (flags & FCP_RESID_UNDER) {
+ fsp->scsi_resid = ntohl(rp_ex->fr_resid);
+ /*
+ * The cmnd->underflow is the minimum number of
+ * bytes that must be transfered for this
+ * command. Provided a sense condition is not
+ * present, make sure the actual amount
+ * transferred is at least the underflow value
+ * or fail.
+ */
+ if (!(flags & FCP_SNS_LEN_VAL) &&
+ (fc_rp->fr_status == 0) &&
+ (scsi_bufflen(fsp->cmd) -
+ fsp->scsi_resid) < fsp->cmd->underflow)
+ goto err;
+ expected_len -= fsp->scsi_resid;
+ } else {
+ fsp->status_code = FC_ERROR;
+ }
+ }
+ }
+ fsp->state |= FC_SRB_RCV_STATUS;
+
+ /*
+ * Check for missing or extra data frames.
+ */
+ if (unlikely(fsp->xfer_len != expected_len)) {
+ if (fsp->xfer_len < expected_len) {
+ /*
+ * Some data may be queued locally,
+ * Wait a at least one jiffy to see if it is delivered.
+ * If this expires without data, we may do SRR.
+ */
+ fc_fcp_timer_set(fsp, 2);
+ return;
+ }
+ fsp->status_code = FC_DATA_OVRRUN;
+ FC_DBG("tgt %6x xfer len %zx greater than expected len %x. "
+ "data len %x\n",
+ fsp->rport->port_id,
+ fsp->xfer_len, expected_len, fsp->data_len);
+ }
+ fc_fcp_complete(fsp);
+ return;
+
+len_err:
+ FC_DBG("short FCP response. flags 0x%x len %u respl %u snsl %u\n",
+ flags, fr_len(fp), respl, snsl);
+err:
+ fsp->status_code = FC_ERROR;
+ fc_fcp_complete(fsp);
+}
+
+/**
+ * fc_fcp_complete - complete processing of a fcp packet
+ * @fsp: fcp packet
+ *
+ * This function may sleep if a timer is pending. The packet lock must be
+ * held, and the host lock must not be held.
+ */
+static void fc_fcp_complete(struct fc_fcp_pkt *fsp)
+{
+ struct fc_lport *lp = fsp->lp;
+ struct fc_seq *sp;
+ u32 f_ctl;
+
+ if (fsp->state & FC_SRB_ABORT_PENDING)
+ return;
+
+ if (fsp->state & FC_SRB_ABORTED) {
+ if (!fsp->status_code)
+ fsp->status_code = FC_CMD_ABORTED;
+ } else {
+ /*
+ * Test for transport underrun, independent of response
+ * underrun status.
+ */
+ if (fsp->xfer_len < fsp->data_len && !fsp->io_status &&
+ (!(fsp->scsi_comp_flags & FCP_RESID_UNDER) ||
+ fsp->xfer_len < fsp->data_len - fsp->scsi_resid)) {
+ fsp->status_code = FC_DATA_UNDRUN;
+ fsp->io_status = SUGGEST_RETRY << 24;
+ }
+ }
+
+ sp = fsp->seq_ptr;
+ if (sp) {
+ fsp->seq_ptr = NULL;
+ if (unlikely(fsp->scsi_comp_flags & FCP_CONF_REQ)) {
+ struct fc_frame *conf_frame;
+ struct fc_seq *csp;
+
+ csp = lp->tt.seq_start_next(sp);
+ conf_frame = fc_frame_alloc(fsp->lp, 0);
+ if (conf_frame) {
+ fc_frame_setup(conf_frame,
+ FC_RCTL_DD_SOL_CTL, FC_TYPE_FCP);
+ f_ctl = FC_FC_SEQ_INIT;
+ f_ctl |= FC_FC_LAST_SEQ | FC_FC_END_SEQ;
+ lp->tt.seq_send(lp, csp, conf_frame, f_ctl);
+ }
+ }
+ lp->tt.exch_done(sp);
+ }
+ fc_io_compl(fsp);
+}
+
+static void fc_fcp_cleanup_cmd(struct fc_fcp_pkt *fsp, int error)
+{
+ struct fc_lport *lp = fsp->lp;
+
+ if (fsp->seq_ptr) {
+ lp->tt.exch_done(fsp->seq_ptr);
+ fsp->seq_ptr = NULL;
+ }
+ fsp->status_code = error;
+}
+
+/**
+ * fc_fcp_cleanup_each_cmd - run fn on each active command
+ * @lp: logical port
+ * @id: target id
+ * @lun: lun
+ * @error: fsp status code
+ *
+ * If lun or id is -1, they are ignored.
+ */
+static void fc_fcp_cleanup_each_cmd(struct fc_lport *lp, unsigned int id,
+ unsigned int lun, int error)
+{
+ struct fc_fcp_internal *si = fc_get_scsi_internal(lp);
+ struct fc_fcp_pkt *fsp;
+ struct scsi_cmnd *sc_cmd;
+ unsigned long flags;
+
+ spin_lock_irqsave(lp->host->host_lock, flags);
+restart:
+ list_for_each_entry(fsp, &si->scsi_pkt_queue, list) {
+ sc_cmd = fsp->cmd;
+ if (id != -1 && scmd_id(sc_cmd) != id)
+ continue;
+
+ if (lun != -1 && sc_cmd->device->lun != lun)
+ continue;
+
+ fc_fcp_pkt_hold(fsp);
+ spin_unlock_irqrestore(lp->host->host_lock, flags);
+
+ if (!fc_fcp_lock_pkt(fsp)) {
+ fc_fcp_cleanup_cmd(fsp, error);
+ fc_io_compl(fsp);
+ fc_fcp_unlock_pkt(fsp);
+ }
+
+ fc_fcp_pkt_release(fsp);
+ spin_lock_irqsave(lp->host->host_lock, flags);
+ /*
+ * while we dropped the lock multiple pkts could
+ * have been released, so we have to start over.
+ */
+ goto restart;
+ }
+ spin_unlock_irqrestore(lp->host->host_lock, flags);
+}
+
+static void fc_fcp_abort_io(struct fc_lport *lp)
+{
+ fc_fcp_cleanup_each_cmd(lp, -1, -1, FC_HRD_ERROR);
+}
+
+/**
+ * fc_fcp_pkt_send - send a fcp packet to the lower level.
+ * @lp: fc lport
+ * @fsp: fc packet.
+ *
+ * This is called by upper layer protocol.
+ * Return : zero for success and -1 for failure
+ * Context : called from queuecommand which can be called from process
+ * or scsi soft irq.
+ * Locks : called with the host lock and irqs disabled.
+ */
+static int fc_fcp_pkt_send(struct fc_lport *lp, struct fc_fcp_pkt *fsp)
+{
+ struct fc_fcp_internal *si = fc_get_scsi_internal(lp);
+ int rc;
+
+ fsp->cmd->SCp.ptr = (char *)fsp;
+ fsp->cdb_cmd.fc_dl = htonl(fsp->data_len);
+ fsp->cdb_cmd.fc_flags = fsp->req_flags & ~FCP_CFL_LEN_MASK;
+
+ int_to_scsilun(fsp->cmd->device->lun,
+ (struct scsi_lun *)fsp->cdb_cmd.fc_lun);
+ memcpy(fsp->cdb_cmd.fc_cdb, fsp->cmd->cmnd, fsp->cmd->cmd_len);
+ list_add_tail(&fsp->list, &si->scsi_pkt_queue);
+
+ spin_unlock_irq(lp->host->host_lock);
+ rc = fc_fcp_send_cmd(fsp);
+ spin_lock_irq(lp->host->host_lock);
+ if (rc)
+ list_del(&fsp->list);
+
+ return rc;
+}
+
+static int fc_fcp_send_cmd(struct fc_fcp_pkt *fsp)
+{
+ struct fc_lport *lp;
+ struct fc_frame *fp;
+ struct fc_seq *sp;
+ struct fc_rport *rport;
+ struct fc_rport_libfc_priv *rp;
+ int rc = 0;
+
+ if (fc_fcp_lock_pkt(fsp))
+ return 0;
+
+ if (fsp->state & FC_SRB_COMPL)
+ goto unlock;
+
+ lp = fsp->lp;
+ fp = fc_frame_alloc(lp, sizeof(fsp->cdb_cmd));
+ if (!fp) {
+ rc = -1;
+ goto unlock;
+ }
+
+ memcpy(fc_frame_payload_get(fp, sizeof(fsp->cdb_cmd)),
+ &fsp->cdb_cmd, sizeof(fsp->cdb_cmd));
+ fc_frame_setup(fp, FC_RCTL_DD_UNSOL_CMD, FC_TYPE_FCP);
+ fc_frame_set_offset(fp, 0);
+ rport = fsp->rport;
+ fsp->max_payload = rport->maxframe_size;
+ rp = rport->dd_data;
+ sp = lp->tt.exch_seq_send(lp, fp,
+ fc_fcp_recv,
+ fc_fcp_pkt_destroy,
+ fsp, 0,
+ fc_host_port_id(rp->local_port->host),
+ rport->port_id,
+ FC_FC_SEQ_INIT | FC_FC_END_SEQ);
+ if (!sp) {
+ fc_frame_free(fp);
+ rc = -1;
+ goto unlock;
+ }
+ fsp->last_pkt_time = jiffies;
+ fsp->seq_ptr = sp;
+ fc_fcp_pkt_hold(fsp); /* hold for fc_fcp_pkt_destroy */
+
+ setup_timer(&fsp->timer, fc_fcp_timeout, (unsigned long)fsp);
+ fc_fcp_timer_set(fsp,
+ (fsp->tgt_flags & FC_RP_FLAGS_REC_SUPPORTED) ?
+ FC_SCSI_REC_TOV : FC_SCSI_ER_TIMEOUT);
+unlock:
+ fc_fcp_unlock_pkt(fsp);
+ return rc;
+}
+
+/*
+ * transport error handler
+ */
+static void fc_fcp_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
+{
+ int error = PTR_ERR(fp);
+
+ if (fc_fcp_lock_pkt(fsp))
+ return;
+
+ switch (error) {
+ case -FC_EX_CLOSED:
+ fc_fcp_retry_cmd(fsp);
+ goto unlock;
+ default:
+ FC_DBG("unknown error %ld\n", PTR_ERR(fp));
+ }
+ /*
+ * clear abort pending, because the lower layer
+ * decided to force completion.
+ */
+ fsp->state &= ~FC_SRB_ABORT_PENDING;
+ fsp->status_code = FC_CMD_PLOGO;
+ fc_fcp_complete(fsp);
+unlock:
+ fc_fcp_unlock_pkt(fsp);
+}
+
+/*
+ * Scsi abort handler- calls to send an abort
+ * and then wait for abort completion
+ */
+static int fc_fcp_pkt_abort(struct fc_lport *lp, struct fc_fcp_pkt *fsp)
+{
+ int rc = FAILED;
+
+ if (fc_fcp_send_abort(fsp))
+ return FAILED;
+
+ init_completion(&fsp->tm_done);
+ fsp->wait_for_comp = 1;
+
+ spin_unlock_bh(&fsp->scsi_pkt_lock);
+ rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV);
+ spin_lock_bh(&fsp->scsi_pkt_lock);
+ fsp->wait_for_comp = 0;
+
+ if (!rc) {
+ FC_DBG("target abort cmd failed\n");
+ rc = FAILED;
+ } else if (fsp->state & FC_SRB_ABORTED) {
+ FC_DBG("target abort cmd passed\n");
+ rc = SUCCESS;
+ fc_fcp_complete(fsp);
+ }
+
+ return rc;
+}
+
+/*
+ * Retry LUN reset after resource allocation failed.
+ */
+static void fc_lun_reset_send(unsigned long data)
+{
+ struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data;
+ const size_t len = sizeof(fsp->cdb_cmd);
+ struct fc_lport *lp = fsp->lp;
+ struct fc_frame *fp;
+ struct fc_seq *sp;
+ struct fc_rport *rport;
+ struct fc_rport_libfc_priv *rp;
+
+ spin_lock_bh(&fsp->scsi_pkt_lock);
+ if (fsp->state & FC_SRB_COMPL)
+ goto unlock;
+
+ fp = fc_frame_alloc(lp, len);
+ if (!fp)
+ goto retry;
+ memcpy(fc_frame_payload_get(fp, len), &fsp->cdb_cmd, len);
+ fc_frame_setup(fp, FC_RCTL_DD_UNSOL_CMD, FC_TYPE_FCP);
+ fc_frame_set_offset(fp, 0);
+ rport = fsp->rport;
+ rp = rport->dd_data;
+ sp = lp->tt.exch_seq_send(lp, fp,
+ fc_tm_done,
+ fc_fcp_pkt_destroy,
+ fsp, 0,
+ fc_host_port_id(rp->local_port->host),
+ rport->port_id,
+ FC_FC_SEQ_INIT | FC_FC_END_SEQ);
+
+ if (sp) {
+ fsp->seq_ptr = sp;
+ fc_fcp_pkt_hold(fsp); /* hold for fc_fcp_pkt_destroy */
+ goto unlock;
+ }
+ /*
+ * Exchange or frame allocation failed. Set timer and retry.
+ */
+ fc_frame_free(fp);
+retry:
+ setup_timer(&fsp->timer, fc_lun_reset_send, (unsigned long)fsp);
+ fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV);
+unlock:
+ spin_unlock_bh(&fsp->scsi_pkt_lock);
+}
+
+/*
+ * Scsi device reset handler- send a LUN RESET to the device
+ * and wait for reset reply
+ */
+static int fc_lun_reset(struct fc_lport *lp, struct fc_fcp_pkt *fsp,
+ unsigned int id, unsigned int lun)
+{
+ int rc;
+
+ fsp->cdb_cmd.fc_dl = htonl(fsp->data_len);
+ fsp->cdb_cmd.fc_tm_flags = FCP_TMF_LUN_RESET;
+ int_to_scsilun(lun, (struct scsi_lun *)fsp->cdb_cmd.fc_lun);
+
+ fsp->wait_for_comp = 1;
+ init_completion(&fsp->tm_done);
+
+ fc_lun_reset_send((unsigned long)fsp);
+
+ /*
+ * wait for completion of reset
+ * after that make sure all commands are terminated
+ */
+ rc = wait_for_completion_timeout(&fsp->tm_done, FC_SCSI_TM_TOV);
+
+ spin_lock_bh(&fsp->scsi_pkt_lock);
+ fsp->state |= FC_SRB_COMPL;
+ spin_unlock_bh(&fsp->scsi_pkt_lock);
+
+ del_timer_sync(&fsp->timer);
+
+ spin_lock_bh(&fsp->scsi_pkt_lock);
+ if (fsp->seq_ptr) {
+ lp->tt.exch_done(fsp->seq_ptr);
+ fsp->seq_ptr = NULL;
+ }
+ fsp->wait_for_comp = 0;
+ spin_unlock_bh(&fsp->scsi_pkt_lock);
+
+ if (!rc) {
+ FC_DBG("lun reset failed\n");
+ return FAILED;
+ }
+
+ /* cdb_status holds the tmf's rsp code */
+ if (fsp->cdb_status != FCP_TMF_CMPL)
+ return FAILED;
+
+ FC_DBG("lun reset to lun %u completed\n", lun);
+ fc_fcp_cleanup_each_cmd(lp, id, lun, FC_CMD_ABORTED);
+ return SUCCESS;
+}
+
+/*
+ * Task Managment response handler
+ */
+static void fc_tm_done(struct fc_seq *sp, struct fc_frame *fp, void *arg)
+{
+ struct fc_fcp_pkt *fsp = arg;
+ struct fc_frame_header *fh;
+
+ spin_lock_bh(&fsp->scsi_pkt_lock);
+ if (IS_ERR(fp)) {
+ /*
+ * If there is an error just let it timeout or wait
+ * for TMF to be aborted if it timedout.
+ *
+ * scsi-eh will escalate for when either happens.
+ */
+ spin_unlock_bh(&fsp->scsi_pkt_lock);
+ return;
+ }
+
+ /*
+ * raced with eh timeout handler.
+ */
+ if ((fsp->state & FC_SRB_COMPL) || !fsp->seq_ptr ||
+ !fsp->wait_for_comp) {
+ spin_unlock_bh(&fsp->scsi_pkt_lock);
+ return;
+ }
+
+ fh = fc_frame_header_get(fp);
+ if (fh->fh_type != FC_TYPE_BLS)
+ fc_fcp_resp(fsp, fp);
+ fsp->seq_ptr = NULL;
+ fsp->lp->tt.exch_done(sp);
+ fc_frame_free(fp);
+ spin_unlock_bh(&fsp->scsi_pkt_lock);
+}
+
+static void fc_fcp_cleanup(struct fc_lport *lp)
+{
+ fc_fcp_cleanup_each_cmd(lp, -1, -1, FC_ERROR);
+}
+
+/*
+ * fc_fcp_timeout: called by OS timer function.
+ *
+ * The timer has been inactivated and must be reactivated if desired
+ * using fc_fcp_timer_set().
+ *
+ * Algorithm:
+ *
+ * If REC is supported, just issue it, and return. The REC exchange will
+ * complete or time out, and recovery can continue at that point.
+ *
+ * Otherwise, if the response has been received without all the data,
+ * it has been ER_TIMEOUT since the response was received.
+ *
+ * If the response has not been received,
+ * we see if data was received recently. If it has been, we continue waiting,
+ * otherwise, we abort the command.
+ */
+static void fc_fcp_timeout(unsigned long data)
+{
+ struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)data;
+ struct fc_rport *rport = fsp->rport;
+ struct fc_rport_libfc_priv *rp = rport->dd_data;
+
+ if (fc_fcp_lock_pkt(fsp))
+ return;
+
+ if (fsp->state & FC_SRB_COMPL)
+ goto unlock;
+ fsp->state |= FC_SRB_FCP_PROCESSING_TMO;
+
+ if (rp->flags & FC_RP_FLAGS_REC_SUPPORTED)
+ fc_fcp_rec(fsp);
+ else if (time_after_eq(fsp->last_pkt_time + (FC_SCSI_ER_TIMEOUT / 2),
+ jiffies))
+ fc_fcp_timer_set(fsp, FC_SCSI_ER_TIMEOUT);
+ else if (fsp->state & FC_SRB_RCV_STATUS)
+ fc_fcp_complete(fsp);
+ else
+ fc_timeout_error(fsp);
+ fsp->state &= ~FC_SRB_FCP_PROCESSING_TMO;
+unlock:
+ fc_fcp_unlock_pkt(fsp);
+}
+
+/*
+ * Send a REC ELS request
+ */
+static void fc_fcp_rec(struct fc_fcp_pkt *fsp)
+{
+ struct fc_lport *lp;
+ struct fc_seq *sp;
+ struct fc_frame *fp;
+ struct fc_els_rec *rec;
+ struct fc_rport *rport;
+ struct fc_rport_libfc_priv *rp;
+ u16 ox_id;
+ u16 rx_id;
+
+ lp = fsp->lp;
+ rport = fsp->rport;
+ rp = rport->dd_data;
+ sp = fsp->seq_ptr;
+ if (!sp || rp->rp_state != RPORT_ST_READY) {
+ fsp->status_code = FC_HRD_ERROR;
+ fsp->io_status = SUGGEST_RETRY << 24;
+ fc_fcp_complete(fsp);
+ return;
+ }
+ lp->tt.seq_get_xids(sp, &ox_id, &rx_id);
+ fp = fc_frame_alloc(lp, sizeof(*rec));
+ if (!fp)
+ goto retry;
+
+ rec = fc_frame_payload_get(fp, sizeof(*rec));
+ memset(rec, 0, sizeof(*rec));
+ rec->rec_cmd = ELS_REC;
+ hton24(rec->rec_s_id, fc_host_port_id(lp->host));
+ rec->rec_ox_id = htons(ox_id);
+ rec->rec_rx_id = htons(rx_id);
+
+ fc_frame_setup(fp, FC_RCTL_ELS_REQ, FC_TYPE_ELS);
+ fc_frame_set_offset(fp, 0);
+ sp = lp->tt.exch_seq_send(lp, fp,
+ fc_fcp_rec_resp, NULL,
+ fsp, jiffies_to_msecs(FC_SCSI_REC_TOV),
+ fc_host_port_id(rp->local_port->host),
+ rport->port_id,
+ FC_FC_SEQ_INIT | FC_FC_END_SEQ);
+
+ if (sp) {
+ fc_fcp_pkt_hold(fsp); /* hold while REC outstanding */
+ return;
+ } else
+ fc_frame_free(fp);
+retry:
+ if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
+ fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV);
+ else
+ fc_timeout_error(fsp);
+}
+
+/*
+ * Receive handler for REC ELS frame
+ * if it is a reject then let the scsi layer to handle
+ * the timeout. if it is a LS_ACC then if the io was not completed
+ * then set the timeout and return otherwise complete the exchange
+ * and tell the scsi layer to restart the I/O.
+ */
+static void fc_fcp_rec_resp(struct fc_seq *sp, struct fc_frame *fp, void *arg)
+{
+ struct fc_fcp_pkt *fsp = (struct fc_fcp_pkt *)arg;
+ struct fc_els_rec_acc *recp;
+ struct fc_els_ls_rjt *rjt;
+ u32 e_stat;
+ u8 opcode;
+ u32 offset;
+ enum dma_data_direction data_dir;
+ enum fc_rctl r_ctl;
+ struct fc_rport_libfc_priv *rp;
+
+ if (IS_ERR(fp)) {
+ fc_fcp_rec_error(fsp, fp);
+ return;
+ }
+
+ if (fc_fcp_lock_pkt(fsp))
+ goto out;
+
+ fsp->recov_retry = 0;
+ opcode = fc_frame_payload_op(fp);
+ if (opcode == ELS_LS_RJT) {
+ rjt = fc_frame_payload_get(fp, sizeof(*rjt));
+ switch (rjt->er_reason) {
+ default:
+ FC_DEBUG_FCP("device %x unexpected REC reject "
+ "reason %d expl %d\n",
+ fsp->rport->port_id, rjt->er_reason,
+ rjt->er_explan);
+ /* fall through */
+ case ELS_RJT_UNSUP:
+ FC_DEBUG_FCP("device does not support REC\n");
+ rp = fsp->rport->dd_data;
+ /*
+ * if we do not spport RECs or got some bogus
+ * reason then resetup timer so we check for
+ * making progress.
+ */
+ rp->flags &= ~FC_RP_FLAGS_REC_SUPPORTED;
+ fc_fcp_timer_set(fsp, FC_SCSI_ER_TIMEOUT);
+ break;
+ case ELS_RJT_LOGIC:
+ case ELS_RJT_UNAB:
+ /*
+ * If no data transfer, the command frame got dropped
+ * so we just retry. If data was transferred, we
+ * lost the response but the target has no record,
+ * so we abort and retry.
+ */
+ if (rjt->er_explan == ELS_EXPL_OXID_RXID &&
+ fsp->xfer_len == 0) {
+ fc_fcp_retry_cmd(fsp);
+ break;
+ }
+ fc_timeout_error(fsp);
+ break;
+ }
+ } else if (opcode == ELS_LS_ACC) {
+ if (fsp->state & FC_SRB_ABORTED)
+ goto unlock_out;
+
+ data_dir = fsp->cmd->sc_data_direction;
+ recp = fc_frame_payload_get(fp, sizeof(*recp));
+ offset = ntohl(recp->reca_fc4value);
+ e_stat = ntohl(recp->reca_e_stat);
+
+ if (e_stat & ESB_ST_COMPLETE) {
+
+ /*
+ * The exchange is complete.
+ *
+ * For output, we must've lost the response.
+ * For input, all data must've been sent.
+ * We lost may have lost the response
+ * (and a confirmation was requested) and maybe
+ * some data.
+ *
+ * If all data received, send SRR
+ * asking for response. If partial data received,
+ * or gaps, SRR requests data at start of gap.
+ * Recovery via SRR relies on in-order-delivery.
+ */
+ if (data_dir == DMA_TO_DEVICE) {
+ r_ctl = FC_RCTL_DD_CMD_STATUS;
+ } else if (fsp->xfer_contig_end == offset) {
+ r_ctl = FC_RCTL_DD_CMD_STATUS;
+ } else {
+ offset = fsp->xfer_contig_end;
+ r_ctl = FC_RCTL_DD_SOL_DATA;
+ }
+ fc_fcp_srr(fsp, r_ctl, offset);
+ } else if (e_stat & ESB_ST_SEQ_INIT) {
+
+ /*
+ * The remote port has the initiative, so just
+ * keep waiting for it to complete.
+ */
+ fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV);
+ } else {
+
+ /*
+ * The exchange is incomplete, we have seq. initiative.
+ * Lost response with requested confirmation,
+ * lost confirmation, lost transfer ready or
+ * lost write data.
+ *
+ * For output, if not all data was received, ask
+ * for transfer ready to be repeated.
+ *
+ * If we received or sent all the data, send SRR to
+ * request response.
+ *
+ * If we lost a response, we may have lost some read
+ * data as well.
+ */
+ r_ctl = FC_RCTL_DD_SOL_DATA;
+ if (data_dir == DMA_TO_DEVICE) {
+ r_ctl = FC_RCTL_DD_CMD_STATUS;
+ if (offset < fsp->data_len)
+ r_ctl = FC_RCTL_DD_DATA_DESC;
+ } else if (offset == fsp->xfer_contig_end) {
+ r_ctl = FC_RCTL_DD_CMD_STATUS;
+ } else if (fsp->xfer_contig_end < offset) {
+ offset = fsp->xfer_contig_end;
+ }
+ fc_fcp_srr(fsp, r_ctl, offset);
+ }
+ }
+unlock_out:
+ fc_fcp_unlock_pkt(fsp);
+out:
+ fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */
+ fc_frame_free(fp);
+}
+
+/*
+ * Handle error response or timeout for REC exchange.
+ */
+static void fc_fcp_rec_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
+{
+ int error = PTR_ERR(fp);
+
+ if (fc_fcp_lock_pkt(fsp))
+ goto out;
+
+ switch (error) {
+ case -FC_EX_CLOSED:
+ fc_fcp_retry_cmd(fsp);
+ break;
+
+ default:
+ FC_DBG("REC %p fid %x error unexpected error %d\n",
+ fsp, fsp->rport->port_id, error);
+ fsp->status_code = FC_CMD_PLOGO;
+ /* fall through */
+
+ case -FC_EX_TIMEOUT:
+ /*
+ * Assume REC or LS_ACC was lost.
+ * The exchange manager will have aborted REC, so retry.
+ */
+ FC_DBG("REC fid %x error error %d retry %d/%d\n",
+ fsp->rport->port_id, error, fsp->recov_retry,
+ FC_MAX_RECOV_RETRY);
+ if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
+ fc_fcp_rec(fsp);
+ else
+ fc_timeout_error(fsp);
+ break;
+ }
+ fc_fcp_unlock_pkt(fsp);
+out:
+ fc_fcp_pkt_release(fsp); /* drop hold for outstanding REC */
+}
+
+/*
+ * Time out error routine:
+ * abort's the I/O close the exchange and
+ * send completion notification to scsi layer
+ */
+static void fc_timeout_error(struct fc_fcp_pkt *fsp)
+{
+ fsp->status_code = FC_CMD_TIME_OUT;
+ fsp->cdb_status = 0;
+ fsp->io_status = 0;
+ /*
+ * if this fails then we let the scsi command timer fire and
+ * scsi-ml escalate.
+ */
+ fc_fcp_send_abort(fsp);
+}
+
+/*
+ * Sequence retransmission request.
+ * This is called after receiving status but insufficient data, or
+ * when expecting status but the request has timed out.
+ */
+static void fc_fcp_srr(struct fc_fcp_pkt *fsp, enum fc_rctl r_ctl, u32 offset)
+{
+ struct fc_lport *lp = fsp->lp;
+ struct fc_rport *rport;
+ struct fc_rport_libfc_priv *rp;
+ struct fc_seq *sp;
+ struct fcp_srr *srr;
+ struct fc_frame *fp;
+ u8 cdb_op;
+ u16 ox_id;
+ u16 rx_id;
+
+ rport = fsp->rport;
+ rp = rport->dd_data;
+ cdb_op = fsp->cdb_cmd.fc_cdb[0];
+ lp->tt.seq_get_xids(fsp->seq_ptr, &ox_id, &rx_id);
+
+ if (!(rp->flags & FC_RP_FLAGS_RETRY) || rp->rp_state != RPORT_ST_READY)
+ goto retry; /* shouldn't happen */
+ fp = fc_frame_alloc(lp, sizeof(*srr));
+ if (!fp)
+ goto retry;
+
+ srr = fc_frame_payload_get(fp, sizeof(*srr));
+ memset(srr, 0, sizeof(*srr));
+ srr->srr_op = ELS_SRR;
+ srr->srr_ox_id = htons(ox_id);
+ srr->srr_rx_id = htons(rx_id);
+ srr->srr_r_ctl = r_ctl;
+ srr->srr_rel_off = htonl(offset);
+
+ fc_frame_setup(fp, FC_RCTL_ELS4_REQ, FC_TYPE_FCP);
+ fc_frame_set_offset(fp, 0);
+ sp = lp->tt.exch_seq_send(lp, fp,
+ fc_fcp_srr_resp, NULL,
+ fsp, jiffies_to_msecs(FC_SCSI_REC_TOV),
+ fc_host_port_id(rp->local_port->host),
+ rport->port_id,
+ FC_FC_SEQ_INIT | FC_FC_END_SEQ);
+ if (!sp) {
+ fc_frame_free(fp);
+ goto retry;
+ }
+ fsp->recov_seq = sp;
+ fsp->xfer_len = offset;
+ fsp->xfer_contig_end = offset;
+ fsp->state &= ~FC_SRB_RCV_STATUS;
+ fc_fcp_pkt_hold(fsp); /* hold for outstanding SRR */
+ return;
+retry:
+ fc_fcp_retry_cmd(fsp);
+}
+
+/*
+ * Handle response from SRR.
+ */
+static void fc_fcp_srr_resp(struct fc_seq *sp, struct fc_frame *fp, void *arg)
+{
+ struct fc_fcp_pkt *fsp = arg;
+ struct fc_frame_header *fh;
+ u16 ox_id;
+ u16 rx_id;
+
+ if (IS_ERR(fp)) {
+ fc_fcp_srr_error(fsp, fp);
+ return;
+ }
+
+ if (fc_fcp_lock_pkt(fsp))
+ goto out;
+
+ fh = fc_frame_header_get(fp);
+ /*
+ * BUG? fc_fcp_srr_error calls exch_done which would release
+ * the ep. But if fc_fcp_srr_error had got -FC_EX_TIMEOUT,
+ * then fc_exch_timeout would be sending an abort. The exch_done
+ * call by fc_fcp_srr_error would prevent fc_exch.c from seeing
+ * an abort response though.
+ */
+ if (fh->fh_type == FC_TYPE_BLS) {
+ fc_fcp_unlock_pkt(fsp);
+ return;
+ }
+
+ fsp->recov_seq = NULL;
+
+ fsp->lp->tt.seq_get_xids(fsp->seq_ptr, &ox_id, &rx_id);
+ switch (fc_frame_payload_op(fp)) {
+ case ELS_LS_ACC:
+ fsp->recov_retry = 0;
+ fc_fcp_timer_set(fsp, FC_SCSI_REC_TOV);
+ break;
+ case ELS_LS_RJT:
+ default:
+ fc_timeout_error(fsp);
+ break;
+ }
+ fc_fcp_unlock_pkt(fsp);
+ fsp->lp->tt.exch_done(sp);
+out:
+ fc_frame_free(fp);
+ fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */
+}
+
+static void fc_fcp_srr_error(struct fc_fcp_pkt *fsp, struct fc_frame *fp)
+{
+ if (fc_fcp_lock_pkt(fsp))
+ goto out;
+ fsp->lp->tt.exch_done(fsp->recov_seq);
+ fsp->recov_seq = NULL;
+ switch (PTR_ERR(fp)) {
+ case -FC_EX_TIMEOUT:
+ if (fsp->recov_retry++ < FC_MAX_RECOV_RETRY)
+ fc_fcp_rec(fsp);
+ else
+ fc_timeout_error(fsp);
+ break;
+ case -FC_EX_CLOSED: /* e.g., link failure */
+ /* fall through */
+ default:
+ fc_fcp_retry_cmd(fsp);
+ break;
+ }
+ fc_fcp_unlock_pkt(fsp);
+out:
+ fc_fcp_pkt_release(fsp); /* drop hold for outstanding SRR */
+}
+
+static inline int fc_fcp_lport_queue_ready(struct fc_lport *lp)
+{
+ /* lock ? */
+ return (lp->state == LPORT_ST_READY) && (lp->link_status & FC_LINK_UP);
+}
+
+/**
+ * fc_queuecommand - The queuecommand function of the scsi template
+ * @cmd: struct scsi_cmnd to be executed
+ * @done: Callback function to be called when cmd is completed
+ *
+ * this is the i/o strategy routine, called by the scsi layer
+ * this routine is called with holding the host_lock.
+ */
+int fc_queuecommand(struct scsi_cmnd *sc_cmd, void (*done)(struct scsi_cmnd *))
+{
+ struct fc_lport *lp;
+ struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
+ struct fc_fcp_pkt *sp;
+ struct fc_rport_libfc_priv *rp;
+ int rval;
+ int rc = 0;
+ struct fcoe_dev_stats *stats;
+
+ lp = shost_priv(sc_cmd->device->host);
+
+ rval = fc_remote_port_chkready(rport);
+ if (rval) {
+ sc_cmd->result = rval;
+ done(sc_cmd);
+ goto out;
+ }
+
+ if (!*(struct fc_remote_port **)rport->dd_data) {
+ /*
+ * rport is transitioning from blocked/deleted to
+ * online
+ */
+ sc_cmd->result = DID_IMM_RETRY << 16;
+ done(sc_cmd);
+ goto out;
+ }
+
+ rp = rport->dd_data;
+
+ if (!fc_fcp_lport_queue_ready(lp)) {
+ rc = SCSI_MLQUEUE_HOST_BUSY;
+ goto out;
+ }
+
+ sp = fc_fcp_pkt_alloc(lp, GFP_ATOMIC);
+ if (sp == NULL) {
+ rc = SCSI_MLQUEUE_HOST_BUSY;
+ goto out;
+ }
+
+ /*
+ * build the libfc request pkt
+ */
+ sp->cmd = sc_cmd; /* save the cmd */
+ sp->lp = lp; /* save the softc ptr */
+ sp->rport = rport; /* set the remote port ptr */
+ sc_cmd->scsi_done = done;
+
+ /*
+ * set up the transfer length
+ */
+ sp->data_len = scsi_bufflen(sc_cmd);
+ sp->xfer_len = 0;
+
+ /*
+ * setup the data direction
+ */
+ stats = lp->dev_stats[smp_processor_id()];
+ if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
+ sp->req_flags = FC_SRB_READ;
+ stats->InputRequests++;
+ stats->InputMegabytes = sp->data_len;
+ } else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
+ sp->req_flags = FC_SRB_WRITE;
+ stats->OutputRequests++;
+ stats->OutputMegabytes = sp->data_len;
+ } else {
+ sp->req_flags = 0;
+ stats->ControlRequests++;
+ }
+
+ sp->tgt_flags = rp->flags;
+
+ init_timer(&sp->timer);
+ sp->timer.data = (unsigned long)sp;
+
+ /*
+ * send it to the lower layer
+ * if we get -1 return then put the request in the pending
+ * queue.
+ */
+ rval = fc_fcp_pkt_send(lp, sp);
+ if (rval != 0) {
+ sp->state = FC_SRB_FREE;
+ fc_fcp_pkt_release(sp);
+ rc = SCSI_MLQUEUE_HOST_BUSY;
+ }
+out:
+ return rc;
+}
+EXPORT_SYMBOL(fc_queuecommand);
+
+/**
+ * fc_io_compl - Handle responses for completed commands
+ * @sp: scsi packet
+ *
+ * Translates a error to a Linux SCSI error.
+ *
+ * The fcp packet lock must be held when calling.
+ */
+static void fc_io_compl(struct fc_fcp_pkt *sp)
+{
+ struct fc_fcp_internal *si;
+ struct scsi_cmnd *sc_cmd;
+ struct fc_lport *lp;
+ unsigned long flags;
+
+ sp->state |= FC_SRB_COMPL;
+ if (!(sp->state & FC_SRB_FCP_PROCESSING_TMO)) {
+ spin_unlock_bh(&sp->scsi_pkt_lock);
+ del_timer_sync(&sp->timer);
+ spin_lock_bh(&sp->scsi_pkt_lock);
+ }
+
+ lp = sp->lp;
+ si = fc_get_scsi_internal(lp);
+ spin_lock_irqsave(lp->host->host_lock, flags);
+ if (!sp->cmd) {
+ spin_unlock_irqrestore(lp->host->host_lock, flags);
+ return;
+ }
+
+ /*
+ * if a command timed out while we had to try and throttle IO
+ * and it is now getting cleaned up, then we are about to
+ * try again so clear the throttled flag incase we get more
+ * time outs.
+ */
+ if (si->throttled && sp->state & FC_SRB_NOMEM)
+ si->throttled = 0;
+
+ sc_cmd = sp->cmd;
+ sp->cmd = NULL;
+
+ if (!sc_cmd->SCp.ptr) {
+ spin_unlock_irqrestore(lp->host->host_lock, flags);
+ return;
+ }
+
+ CMD_SCSI_STATUS(sc_cmd) = sp->cdb_status;
+ switch (sp->status_code) {
+ case FC_COMPLETE:
+ if (sp->cdb_status == 0) {
+ /*
+ * good I/O status
+ */
+ sc_cmd->result = DID_OK << 16;
+ if (sp->scsi_resid)
+ CMD_RESID_LEN(sc_cmd) = sp->scsi_resid;
+ } else if (sp->cdb_status == QUEUE_FULL) {
+ struct scsi_device *tmp_sdev;
+ struct scsi_device *sdev = sc_cmd->device;
+
+ shost_for_each_device(tmp_sdev, sdev->host) {
+ if (tmp_sdev->id != sdev->id)
+ continue;
+
+ if (tmp_sdev->queue_depth > 1) {
+ scsi_track_queue_full(tmp_sdev,
+ tmp_sdev->
+ queue_depth - 1);
+ }
+ }
+ sc_cmd->result = (DID_OK << 16) | sp->cdb_status;
+ } else {
+ /*
+ * transport level I/O was ok but scsi
+ * has non zero status
+ */
+ sc_cmd->result = (DID_OK << 16) | sp->cdb_status;
+ }
+ break;
+ case FC_ERROR:
+ sc_cmd->result = DID_ERROR << 16;
+ break;
+ case FC_DATA_UNDRUN:
+ if (sp->cdb_status == 0) {
+ /*
+ * scsi status is good but transport level
+ * underrun. for read it should be an error??
+ */
+ sc_cmd->result = (DID_OK << 16) | sp->cdb_status;
+ } else {
+ /*
+ * scsi got underrun, this is an error
+ */
+ CMD_RESID_LEN(sc_cmd) = sp->scsi_resid;
+ sc_cmd->result = (DID_ERROR << 16) | sp->cdb_status;
+ }
+ break;
+ case FC_DATA_OVRRUN:
+ /*
+ * overrun is an error
+ */
+ sc_cmd->result = (DID_ERROR << 16) | sp->cdb_status;
+ break;
+ case FC_CMD_ABORTED:
+ sc_cmd->result = (DID_ABORT << 16) | sp->io_status;
+ break;
+ case FC_CMD_TIME_OUT:
+ sc_cmd->result = (DID_BUS_BUSY << 16) | sp->io_status;
+ break;
+ case FC_CMD_RESET:
+ sc_cmd->result = (DID_RESET << 16);
+ break;
+ case FC_HRD_ERROR:
+ sc_cmd->result = (DID_NO_CONNECT << 16);
+ break;
+ default:
+ sc_cmd->result = (DID_ERROR << 16);
+ break;
+ }
+
+ list_del(&sp->list);
+ sc_cmd->SCp.ptr = NULL;
+ sc_cmd->scsi_done(sc_cmd);
+ spin_unlock_irqrestore(lp->host->host_lock, flags);
+
+ /* release ref from initial allocation in queue command */
+ fc_fcp_pkt_release(sp);
+}
+
+/**
+ * fc_eh_abort - Abort a command...from scsi host template
+ * @sc_cmd: scsi command to abort
+ *
+ * send ABTS to the target device and wait for the response
+ * sc_cmd is the pointer to the command to be aborted.
+ */
+int fc_eh_abort(struct scsi_cmnd *sc_cmd)
+{
+ struct fc_fcp_pkt *sp;
+ struct fc_lport *lp;
+ int rc = FAILED;
+ unsigned long flags;
+
+ lp = shost_priv(sc_cmd->device->host);
+ if (lp->state != LPORT_ST_READY)
+ return rc;
+ else if (!(lp->link_status & FC_LINK_UP))
+ return rc;
+
+ spin_lock_irqsave(lp->host->host_lock, flags);
+ sp = CMD_SP(sc_cmd);
+ if (!sp) {
+ /* command completed while scsi eh was setting up */
+ spin_unlock_irqrestore(lp->host->host_lock, flags);
+ return SUCCESS;
+ }
+ /* grab a ref so the sp and sc_cmd cannot be relased from under us */
+ fc_fcp_pkt_hold(sp);
+ spin_unlock_irqrestore(lp->host->host_lock, flags);
+
+ if (fc_fcp_lock_pkt(sp)) {
+ /* completed while we were waiting for timer to be deleted */
+ rc = SUCCESS;
+ goto release_pkt;
+ }
+
+ rc = fc_fcp_pkt_abort(lp, sp);
+ fc_fcp_unlock_pkt(sp);
+
+release_pkt:
+ fc_fcp_pkt_release(sp);
+ return rc;
+}
+EXPORT_SYMBOL(fc_eh_abort);
+
+/**
+ * fc_eh_device_reset: Reset a single LUN
+ * @sc_cmd: scsi command
+ *
+ * Set from scsi host template to send tm cmd to the target and wait for the
+ * response.
+ */
+int fc_eh_device_reset(struct scsi_cmnd *sc_cmd)
+{
+ struct fc_lport *lp;
+ struct fc_fcp_pkt *sp;
+ struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
+ int rc = FAILED;
+ struct fc_rport_libfc_priv *rp;
+ int rval;
+
+ rval = fc_remote_port_chkready(rport);
+ if (rval)
+ goto out;
+
+ rp = rport->dd_data;
+ lp = shost_priv(sc_cmd->device->host);
+
+ if (lp->state != LPORT_ST_READY)
+ return rc;
+
+ sp = fc_fcp_pkt_alloc(lp, GFP_NOIO);
+ if (sp == NULL) {
+ FC_DBG("could not allocate scsi_pkt\n");
+ sc_cmd->result = DID_NO_CONNECT << 16;
+ goto out;
+ }
+
+ /*
+ * Build the libfc request pkt. Do not set the scsi cmnd, because
+ * the sc passed in is not setup for execution like when sent
+ * through the queuecommand callout.
+ */
+ sp->lp = lp; /* save the softc ptr */
+ sp->rport = rport; /* set the remote port ptr */
+
+ /*
+ * flush outstanding commands
+ */
+ rc = fc_lun_reset(lp, sp, scmd_id(sc_cmd), sc_cmd->device->lun);
+ sp->state = FC_SRB_FREE;
+ fc_fcp_pkt_release(sp);
+
+out:
+ return rc;
+}
+EXPORT_SYMBOL(fc_eh_device_reset);
+
+/**
+ * fc_eh_host_reset - The reset function will reset the ports on the host.
+ * @sc_cmd: scsi command
+ */
+int fc_eh_host_reset(struct scsi_cmnd *sc_cmd)
+{
+ struct Scsi_Host *shost = sc_cmd->device->host;
+ struct fc_lport *lp = shost_priv(shost);
+ unsigned long wait_tmo;
+
+ lp->tt.lport_reset(lp);
+ wait_tmo = jiffies + FC_HOST_RESET_TIMEOUT;
+ while (!fc_fcp_lport_queue_ready(lp) && time_before(jiffies, wait_tmo))
+ msleep(1000);
+
+ if (fc_fcp_lport_queue_ready(lp)) {
+ shost_printk(KERN_INFO, shost, "Host reset succeeded.\n");
+ return SUCCESS;
+ } else {
+ shost_printk(KERN_INFO, shost, "Host reset failed. "
+ "lport not ready.\n");
+ return FAILED;
+ }
+}
+EXPORT_SYMBOL(fc_eh_host_reset);
+
+/**
+ * fc_slave_alloc - configure queue depth
+ * @sdev: scsi device
+ *
+ * Configures queue depth based on host's cmd_per_len. If not set
+ * then we use the libfc default.
+ */
+int fc_slave_alloc(struct scsi_device *sdev)
+{
+ struct fc_rport *rport = starget_to_rport(scsi_target(sdev));
+ int queue_depth;
+
+ if (!rport || fc_remote_port_chkready(rport))
+ return -ENXIO;
+
+ if (sdev->tagged_supported) {
+ if (sdev->host->hostt->cmd_per_lun)
+ queue_depth = sdev->host->hostt->cmd_per_lun;
+ else
+ queue_depth = FC_FCP_DFLT_QUEUE_DEPTH;
+ scsi_activate_tcq(sdev, queue_depth);
+ }
+ return 0;
+}
+EXPORT_SYMBOL(fc_slave_alloc);
+
+int fc_change_queue_depth(struct scsi_device *sdev, int qdepth)
+{
+ scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
+ return sdev->queue_depth;
+}
+EXPORT_SYMBOL(fc_change_queue_depth);
+
+int fc_change_queue_type(struct scsi_device *sdev, int tag_type)
+{
+ if (sdev->tagged_supported) {
+ scsi_set_tag_type(sdev, tag_type);
+ if (tag_type)
+ scsi_activate_tcq(sdev, sdev->queue_depth);
+ else
+ scsi_deactivate_tcq(sdev, sdev->queue_depth);
+ } else
+ tag_type = 0;
+
+ return tag_type;
+}
+EXPORT_SYMBOL(fc_change_queue_type);
+
+void fc_fcp_destroy(struct fc_lport *lp)
+{
+ struct fc_fcp_internal *si = fc_get_scsi_internal(lp);
+
+ if (!list_empty(&si->scsi_pkt_queue))
+ printk(KERN_ERR "Leaked scsi packets.\n");
+
+ mempool_destroy(si->scsi_pkt_pool);
+ kfree(si);
+ lp->scsi_priv = NULL;
+}
+EXPORT_SYMBOL(fc_fcp_destroy);
+
+int fc_fcp_init(struct fc_lport *lp)
+{
+ int rc;
+ struct fc_fcp_internal *si;
+
+ if (!lp->tt.scsi_cleanup)
+ lp->tt.scsi_cleanup = fc_fcp_cleanup;
+
+ if (!lp->tt.scsi_abort_io)
+ lp->tt.scsi_abort_io = fc_fcp_abort_io;
+
+ si = kzalloc(sizeof(struct fc_fcp_internal), GFP_KERNEL);
+ if (!si)
+ return -ENOMEM;
+ lp->scsi_priv = si;
+ INIT_LIST_HEAD(&si->scsi_pkt_queue);
+
+ si->scsi_pkt_pool = mempool_create_slab_pool(2, scsi_pkt_cachep);
+ if (!si->scsi_pkt_pool) {
+ rc = -ENOMEM;
+ goto free_internal;
+ }
+ return 0;
+
+free_internal:
+ kfree(si);
+ return rc;
+}
+EXPORT_SYMBOL(fc_fcp_init);
+
+static int __init libfc_init(void)
+{
+ int rc;
+
+ scsi_pkt_cachep = kmem_cache_create("libfc_fcp_pkt",
+ sizeof(struct fc_fcp_pkt),
+ 0, SLAB_HWCACHE_ALIGN, NULL, NULL);
+ if (scsi_pkt_cachep == NULL) {
+ FC_DBG("Unable to allocate SRB cache...module load failed!");
+ return -ENOMEM;
+ }
+
+ rc = fc_setup_exch_mgr();
+ if (rc)
+ goto destroy_pkt_cache;
+
+ rc = fc_setup_rport();
+ if (rc)
+ goto destroy_em;
+
+ return rc;
+destroy_em:
+ fc_destroy_exch_mgr();
+destroy_pkt_cache:
+ kmem_cache_destroy(scsi_pkt_cachep);
+ return rc;
+}
+
+static void __exit libfc_exit(void)
+{
+ kmem_cache_destroy(scsi_pkt_cachep);
+ fc_destroy_exch_mgr();
+ fc_destroy_rport();
+}
+
+module_init(libfc_init);
+module_exit(libfc_exit);
diff --git a/drivers/scsi/libfc/fc_frame.c b/drivers/scsi/libfc/fc_frame.c
new file mode 100644
index 0000000..388dc6c
--- /dev/null
+++ b/drivers/scsi/libfc/fc_frame.c
@@ -0,0 +1,88 @@
+/*
+ * Copyright(c) 2007 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Maintained at www.Open-FCoE.org
+ */
+
+/*
+ * Frame allocation.
+ */
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/skbuff.h>
+#include <linux/crc32.h>
+
+#include <scsi/libfc/fc_frame.h>
+
+/*
+ * Check the CRC in a frame.
+ */
+u32 fc_frame_crc_check(struct fc_frame *fp)
+{
+ u32 crc;
+ u32 error;
+ const u8 *bp;
+ unsigned int len;
+
+ WARN_ON(!fc_frame_is_linear(fp));
+ fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED;
+ len = (fr_len(fp) + 3) & ~3; /* round up length to include fill */
+ bp = (const u8 *) fr_hdr(fp);
+ crc = ~crc32(~0, bp, len);
+ error = crc ^ *(u32 *) (bp + len);
+ return error;
+}
+EXPORT_SYMBOL(fc_frame_crc_check);
+
+/*
+ * Allocate a frame intended to be sent via fcoe_xmit.
+ * Get an sk_buff for the frame and set the length.
+ */
+struct fc_frame *__fc_frame_alloc(size_t len)
+{
+ struct fc_frame *fp;
+ struct sk_buff *skb;
+
+ WARN_ON((len % sizeof(u32)) != 0);
+ len += sizeof(struct fc_frame_header);
+ skb = dev_alloc_skb(len + FC_FRAME_HEADROOM + FC_FRAME_TAILROOM);
+ if (!skb)
+ return NULL;
+ fp = (struct fc_frame *) skb;
+ fc_frame_init(fp);
+ skb_reserve(skb, FC_FRAME_HEADROOM);
+ skb_put(skb, len);
+ return fp;
+}
+EXPORT_SYMBOL(__fc_frame_alloc);
+
+
+struct fc_frame *fc_frame_alloc_fill(struct fc_lport *lp, size_t payload_len)
+{
+ struct fc_frame *fp;
+ size_t fill;
+
+ fill = payload_len % 4;
+ if (fill != 0)
+ fill = 4 - fill;
+ fp = __fc_frame_alloc(payload_len + fill);
+ if (fp) {
+ memset((char *) fr_hdr(fp) + payload_len, 0, fill);
+ /* trim is OK, we just allocated it so there are no fragments */
+ skb_trim(fp_skb(fp), payload_len + sizeof(struct fc_frame_header));
+ }
+ return fp;
+}
diff --git a/drivers/scsi/libfc/fc_lport.c b/drivers/scsi/libfc/fc_lport.c
new file mode 100644
index 0000000..edb6d39
--- /dev/null
+++ b/drivers/scsi/libfc/fc_lport.c
@@ -0,0 +1,1601 @@
+/*
+ * Copyright(c) 2007 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Maintained at www.Open-FCoE.org
+ */
+
+/*
+ * General locking notes:
+ *
+ * The lport and rport blocks both have mutexes that are used to protect
+ * the port objects states. The main motivation for this protection is that
+ * we don't want to be preparing a request/response in one context while
+ * another thread "resets" the port in question. For example, if the lport
+ * block is sending a SCR request to the directory server we don't want
+ * the lport to be reset before we fill out the frame header's port_id. The
+ * problem is that a reset would cause the lport's port_id to reset to 0.
+ * If we don't protect the lport we'd spew incorrect frames.
+ *
+ * At the time of this writing there are two primary mutexes, one for the
+ * lport and one for the rport. Since the lport uses the rport and makes
+ * calls into that block the rport should never make calls that would cause
+ * the lport's mutex to be locked. In other words, the lport's mutex is
+ * considered the outer lock and the rport's lock is considered the inner
+ * lock. The bottom line is that you can hold a lport's mutex and then
+ * hold the rport's mutex, but not the other way around.
+ *
+ * The only complication to this rule is the callbacks from the rport to
+ * the lport's event_callback function. When rports become READY they make
+ * a callback to the lport so that it can track them. In the case of the
+ * directory server that callback might cause the lport to change its
+ * state, implying that the lport mutex would need to be held. This problem
+ * was solved by serializing the rport notifications to the lport and the
+ * callback is made without holding the rport's lock.
+ *
+ * lport locking notes:
+ *
+ * The critical sections protected by the lport's mutex are quite broad and
+ * may be improved upon in the future. The lport code and its locking doesn't
+ * influence the I/O path, so excessive locking doesn't penalize I/O
+ * performance.
+ *
+ * The strategy is to lock whenever processing a request or response. Note
+ * that every _enter_* function corresponds to a state change. They generally
+ * change the lports state and then sends a request out on the wire. We lock
+ * before calling any of these functions to protect that state change. This
+ * means that the entry points into the lport block to manage the locks while
+ * the state machine can transition between states (i.e. _enter_* functions)
+ * while always staying protected.
+ *
+ * When handling responses we also hold the lport mutex broadly. When the
+ * lport receives the response frame it locks the mutex and then calls the
+ * appropriate handler for the particuar response. Generally a response will
+ * trigger a state change and so the lock must already be held.
+ *
+ * Retries also have to consider the locking. The retries occur from a work
+ * context and the work function will lock the lport and then retry the state
+ * (i.e. _enter_* function).
+ *
+ * The implication to all of this is that each lport can only process one
+ * state at a time.
+ */
+
+#include <linux/timer.h>
+#include <asm/unaligned.h>
+
+#include <scsi/fc/fc_gs.h>
+
+#include <scsi/libfc/libfc.h>
+
+/* Fabric IDs to use for point-to-point mode, chosen on whims. */
+#define FC_LOCAL_PTP_FID_LO 0x010101
+#define FC_LOCAL_PTP_FID_HI 0x010102
+
+#define DNS_DELAY 3 /* Discovery delay after RSCN (in seconds)*/
+
+static int fc_lport_debug;
+
+#define FC_DEBUG_LPORT(fmt...) \
+ do { \
+ if (fc_lport_debug) \
+ FC_DBG(fmt); \
+ } while (0)
+
+static void fc_lport_error(struct fc_lport *, struct fc_frame *);
+
+static void fc_lport_enter_reset(struct fc_lport *);
+static void fc_lport_enter_flogi(struct fc_lport *);
+static void fc_lport_enter_dns(struct fc_lport *);
+static void fc_lport_enter_rpn_id(struct fc_lport *);
+static void fc_lport_enter_rft_id(struct fc_lport *);
+static void fc_lport_enter_scr(struct fc_lport *);
+static void fc_lport_enter_ready(struct fc_lport *);
+static void fc_lport_enter_logo(struct fc_lport *);
+
+static const char *fc_lport_state_names[] = {
+ [LPORT_ST_NONE] = "none",
+ [LPORT_ST_FLOGI] = "FLOGI",
+ [LPORT_ST_DNS] = "dNS",
+ [LPORT_ST_RPN_ID] = "RPN_ID",
+ [LPORT_ST_RFT_ID] = "RFT_ID",
+ [LPORT_ST_SCR] = "SCR",
+ [LPORT_ST_READY] = "Ready",
+ [LPORT_ST_LOGO] = "LOGO",
+ [LPORT_ST_RESET] = "reset",
+};
+
+static int fc_frame_drop(struct fc_lport *lport, struct fc_frame *fp)
+{
+ fc_frame_free(fp);
+ return 0;
+}
+
+/**
+ * fc_lport_lookup_rport - lookup a remote port by port_id
+ * @lport: Fibre Channel host port instance
+ * @port_id: remote port port_id to match
+ */
+struct fc_rport *fc_lport_lookup_rport(const struct fc_lport *lport,
+ u32 port_id)
+{
+ struct fc_rport *rport, *found;
+ struct fc_rport_libfc_priv *rdata;
+
+ found = NULL;
+
+ list_for_each_entry(rdata, &lport->rports, peers) {
+ rport = PRIV_TO_RPORT(rdata);
+ if (rport->port_id == port_id) {
+ found = rport;
+ get_device(&found->dev);
+ break;
+ }
+ }
+ return found;
+}
+
+
+
+/**
+ * fc_lport_rport_event - Event handler for rport events
+ * @lport: The lport which is receiving the event
+ * @rport: The rport which the event has occured on
+ * @event: The event that occured
+ *
+ * Locking Note: The rport lock should not be held when calling
+ * this function.
+ */
+static void fc_lport_rport_event(struct fc_lport *lport,
+ struct fc_rport *rport,
+ enum fc_lport_event event)
+{
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+
+ FC_DEBUG_LPORT("Received a %d event for port (%6x)\n", event,
+ rport->port_id);
+
+ mutex_lock(&lport->lp_mutex);
+ switch (event) {
+ case LPORT_EV_RPORT_CREATED:
+ if (rport->port_id == FC_FID_DIR_SERV) {
+ lport->dns_rp = rport;
+ fc_lport_enter_rpn_id(lport);
+ } else {
+ list_add_tail(&rdata->peers, &lport->rports);
+ }
+ break;
+ case LPORT_EV_RPORT_LOGO:
+ case LPORT_EV_RPORT_FAILED:
+ case LPORT_EV_RPORT_STOP:
+ if (rport->port_id == FC_FID_DIR_SERV)
+ lport->dns_rp = NULL;
+ else
+ list_del(&rdata->peers);
+ break;
+ case LPORT_EV_RPORT_NONE:
+ break;
+ }
+ mutex_unlock(&lport->lp_mutex);
+}
+
+/**
+ * fc_lport_state - Return a string which represents the lport's state
+ * @lport: The lport whose state is to converted to a string
+ */
+static const char *fc_lport_state(struct fc_lport *lport)
+{
+ const char *cp;
+
+ cp = fc_lport_state_names[lport->state];
+ if (!cp)
+ cp = "unknown";
+ return cp;
+}
+
+/**
+ * fc_lport_ptp_setup - Create an rport for point-to-point mode
+ * @lport: The lport to attach the ptp rport to
+ * @fid: The FID of the ptp rport
+ * @remote_wwpn: The WWPN of the ptp rport
+ * @remote_wwnn: The WWNN of the ptp rport
+ */
+static void fc_lport_ptp_setup(struct fc_lport *lport,
+ u32 remote_fid, u64 remote_wwpn,
+ u64 remote_wwnn)
+{
+ struct fc_disc_port dp;
+
+ dp.lp = lport;
+ dp.ids.port_id = remote_fid;
+ dp.ids.port_name = remote_wwpn;
+ dp.ids.node_name = remote_wwnn;
+ dp.ids.roles = FC_RPORT_ROLE_UNKNOWN;
+
+ if (lport->ptp_rp) {
+ lport->tt.rport_stop(lport->ptp_rp);
+ lport->ptp_rp = NULL;
+ }
+
+ lport->ptp_rp = fc_rport_rogue_create(&dp);
+
+ lport->tt.rport_login(lport->ptp_rp);
+
+ fc_lport_enter_ready(lport);
+}
+
+void fc_get_host_port_type(struct Scsi_Host *shost)
+{
+ /* TODO - currently just NPORT */
+ fc_host_port_type(shost) = FC_PORTTYPE_NPORT;
+}
+EXPORT_SYMBOL(fc_get_host_port_type);
+
+void fc_get_host_port_state(struct Scsi_Host *shost)
+{
+ struct fc_lport *lp = shost_priv(shost);
+
+ if ((lp->link_status & FC_LINK_UP) == FC_LINK_UP)
+ fc_host_port_state(shost) = FC_PORTSTATE_ONLINE;
+ else
+ fc_host_port_state(shost) = FC_PORTSTATE_OFFLINE;
+}
+EXPORT_SYMBOL(fc_get_host_port_state);
+
+void fc_get_host_speed(struct Scsi_Host *shost)
+{
+ struct fc_lport *lport = shost_priv(shost);
+
+ fc_host_speed(shost) = lport->link_speed;
+}
+EXPORT_SYMBOL(fc_get_host_speed);
+
+struct fc_host_statistics *fc_get_host_stats(struct Scsi_Host *shost)
+{
+ int i;
+ struct fc_host_statistics *fcoe_stats;
+ struct fc_lport *lp = shost_priv(shost);
+ struct timespec v0, v1;
+
+ fcoe_stats = &lp->host_stats;
+ memset(fcoe_stats, 0, sizeof(struct fc_host_statistics));
+
+ jiffies_to_timespec(jiffies, &v0);
+ jiffies_to_timespec(lp->boot_time, &v1);
+ fcoe_stats->seconds_since_last_reset = (v0.tv_sec - v1.tv_sec);
+
+ for_each_online_cpu(i) {
+ struct fcoe_dev_stats *stats = lp->dev_stats[i];
+ if (stats == NULL)
+ continue;
+ fcoe_stats->tx_frames += stats->TxFrames;
+ fcoe_stats->tx_words += stats->TxWords;
+ fcoe_stats->rx_frames += stats->RxFrames;
+ fcoe_stats->rx_words += stats->RxWords;
+ fcoe_stats->error_frames += stats->ErrorFrames;
+ fcoe_stats->invalid_crc_count += stats->InvalidCRCCount;
+ fcoe_stats->fcp_input_requests += stats->InputRequests;
+ fcoe_stats->fcp_output_requests += stats->OutputRequests;
+ fcoe_stats->fcp_control_requests += stats->ControlRequests;
+ fcoe_stats->fcp_input_megabytes += stats->InputMegabytes;
+ fcoe_stats->fcp_output_megabytes += stats->OutputMegabytes;
+ fcoe_stats->link_failure_count += stats->LinkFailureCount;
+ }
+ fcoe_stats->lip_count = -1;
+ fcoe_stats->nos_count = -1;
+ fcoe_stats->loss_of_sync_count = -1;
+ fcoe_stats->loss_of_signal_count = -1;
+ fcoe_stats->prim_seq_protocol_err_count = -1;
+ fcoe_stats->dumped_frames = -1;
+ return fcoe_stats;
+}
+EXPORT_SYMBOL(fc_get_host_stats);
+
+/*
+ * Fill in FLOGI command for request.
+ */
+static void
+fc_lport_flogi_fill(struct fc_lport *lport, struct fc_els_flogi *flogi,
+ unsigned int op)
+{
+ struct fc_els_csp *sp;
+ struct fc_els_cssp *cp;
+
+ memset(flogi, 0, sizeof(*flogi));
+ flogi->fl_cmd = (u8) op;
+ put_unaligned(htonll(lport->wwpn), &flogi->fl_wwpn);
+ put_unaligned(htonll(lport->wwnn), &flogi->fl_wwnn);
+
+ sp = &flogi->fl_csp;
+ sp->sp_hi_ver = 0x20;
+ sp->sp_lo_ver = 0x20;
+ sp->sp_bb_cred = htons(10); /* this gets set by gateway */
+ sp->sp_bb_data = htons((u16) lport->mfs);
+ cp = &flogi->fl_cssp[3 - 1]; /* class 3 parameters */
+ cp->cp_class = htons(FC_CPC_VALID | FC_CPC_SEQ);
+ if (op != ELS_FLOGI) {
+ sp->sp_features = htons(FC_SP_FT_CIRO);
+ sp->sp_tot_seq = htons(255); /* seq. we accept */
+ sp->sp_rel_off = htons(0x1f);
+ sp->sp_e_d_tov = htonl(lport->e_d_tov);
+
+ cp->cp_rdfs = htons((u16) lport->mfs);
+ cp->cp_con_seq = htons(255);
+ cp->cp_open_seq = 1;
+ }
+}
+
+/*
+ * Add a supported FC-4 type.
+ */
+static void fc_lport_add_fc4_type(struct fc_lport *lport, enum fc_fh_type type)
+{
+ __be32 *mp;
+
+ mp = &lport->fcts.ff_type_map[type / FC_NS_BPW];
+ *mp = htonl(ntohl(*mp) | 1UL << (type % FC_NS_BPW));
+}
+
+/**
+ * fc_lport_recv_rlir_req - Handle received Registered Link Incident Report.
+ * @lport: Fibre Channel local port recieving the RLIR
+ * @sp: current sequence in the RLIR exchange
+ * @fp: RLIR request frame
+ *
+ * Locking Note: The lport lock is exected to be held before calling
+ * this function.
+ */
+static void fc_lport_recv_rlir_req(struct fc_seq *sp, struct fc_frame *fp,
+ struct fc_lport *lport)
+{
+ FC_DEBUG_LPORT("Received RLIR request while in state %s\n",
+ fc_lport_state(lport));
+
+ lport->tt.seq_els_rsp_send(sp, ELS_LS_ACC, NULL);
+ fc_frame_free(fp);
+}
+
+/**
+ * fc_lport_recv_echo_req - Handle received ECHO request
+ * @lport: Fibre Channel local port recieving the ECHO
+ * @sp: current sequence in the ECHO exchange
+ * @fp: ECHO request frame
+ *
+ * Locking Note: The lport lock is exected to be held before calling
+ * this function.
+ */
+static void fc_lport_recv_echo_req(struct fc_seq *sp, struct fc_frame *in_fp,
+ struct fc_lport *lport)
+{
+ struct fc_frame *fp;
+ unsigned int len;
+ void *pp;
+ void *dp;
+ u32 f_ctl;
+
+ FC_DEBUG_LPORT("Received RLIR request while in state %s\n",
+ fc_lport_state(lport));
+
+ len = fr_len(in_fp) - sizeof(struct fc_frame_header);
+ pp = fc_frame_payload_get(in_fp, len);
+
+ if (len < sizeof(__be32))
+ len = sizeof(__be32);
+
+ fp = fc_frame_alloc(lport, len);
+ if (fp) {
+ dp = fc_frame_payload_get(fp, len);
+ memcpy(dp, pp, len);
+ *((u32 *)dp) = htonl(ELS_LS_ACC << 24);
+ sp = lport->tt.seq_start_next(sp);
+ f_ctl = FC_FC_LAST_SEQ | FC_FC_END_SEQ;
+ fc_frame_setup(fp, FC_RCTL_ELS_REP, FC_TYPE_ELS);
+ lport->tt.seq_send(lport, sp, fp, f_ctl);
+ }
+ fc_frame_free(in_fp);
+}
+
+/**
+ * fc_lport_recv_echo_req - Handle received Request Node ID data request
+ * @lport: Fibre Channel local port recieving the RNID
+ * @sp: current sequence in the RNID exchange
+ * @fp: RNID request frame
+ *
+ * Locking Note: The lport lock is exected to be held before calling
+ * this function.
+ */
+static void fc_lport_recv_rnid_req(struct fc_seq *sp, struct fc_frame *in_fp,
+ struct fc_lport *lport)
+{
+ struct fc_frame *fp;
+ struct fc_els_rnid *req;
+ struct {
+ struct fc_els_rnid_resp rnid;
+ struct fc_els_rnid_cid cid;
+ struct fc_els_rnid_gen gen;
+ } *rp;
+ struct fc_seq_els_data rjt_data;
+ u8 fmt;
+ size_t len;
+ u32 f_ctl;
+
+ FC_DEBUG_LPORT("Received RNID request while in state %s\n",
+ fc_lport_state(lport));
+
+ req = fc_frame_payload_get(in_fp, sizeof(*req));
+ if (!req) {
+ rjt_data.fp = NULL;
+ rjt_data.reason = ELS_RJT_LOGIC;
+ rjt_data.explan = ELS_EXPL_NONE;
+ lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data);
+ } else {
+ fmt = req->rnid_fmt;
+ len = sizeof(*rp);
+ if (fmt != ELS_RNIDF_GEN ||
+ ntohl(lport->rnid_gen.rnid_atype) == 0) {
+ fmt = ELS_RNIDF_NONE; /* nothing to provide */
+ len -= sizeof(rp->gen);
+ }
+ fp = fc_frame_alloc(lport, len);
+ if (fp) {
+ rp = fc_frame_payload_get(fp, len);
+ memset(rp, 0, len);
+ rp->rnid.rnid_cmd = ELS_LS_ACC;
+ rp->rnid.rnid_fmt = fmt;
+ rp->rnid.rnid_cid_len = sizeof(rp->cid);
+ rp->cid.rnid_wwpn = htonll(lport->wwpn);
+ rp->cid.rnid_wwnn = htonll(lport->wwnn);
+ if (fmt == ELS_RNIDF_GEN) {
+ rp->rnid.rnid_sid_len = sizeof(rp->gen);
+ memcpy(&rp->gen, &lport->rnid_gen,
+ sizeof(rp->gen));
+ }
+ sp = lport->tt.seq_start_next(sp);
+ f_ctl = FC_FC_SEQ_INIT | FC_FC_LAST_SEQ | FC_FC_END_SEQ;
+ fc_frame_setup(fp, FC_RCTL_ELS_REP, FC_TYPE_ELS);
+ lport->tt.seq_send(lport, sp, fp, f_ctl);
+ }
+ }
+ fc_frame_free(in_fp);
+}
+
+/**
+ * fc_lport_recv_logo_req - Handle received fabric LOGO request
+ * @lport: Fibre Channel local port recieving the LOGO
+ * @sp: current sequence in the LOGO exchange
+ * @fp: LOGO request frame
+ *
+ * Locking Note: The lport lock is exected to be held before calling
+ * this function.
+ */
+static void fc_lport_recv_logo_req(struct fc_seq *sp, struct fc_frame *fp,
+ struct fc_lport *lport)
+{
+ lport->tt.seq_els_rsp_send(sp, ELS_LS_ACC, NULL);
+ fc_lport_enter_reset(lport);
+ fc_frame_free(fp);
+}
+
+/**
+ * fc_fabric_login - Start the lport state machine
+ * @lport: The lport that should log into the fabric
+ *
+ * Locking Note: This function should not be called
+ * with the lport lock held.
+ */
+int fc_fabric_login(struct fc_lport *lport)
+{
+ int rc = -1;
+
+ mutex_lock(&lport->lp_mutex);
+ if (lport->state == LPORT_ST_NONE) {
+ fc_lport_enter_reset(lport);
+ rc = 0;
+ }
+ mutex_unlock(&lport->lp_mutex);
+
+ return rc;
+}
+EXPORT_SYMBOL(fc_fabric_login);
+
+/**
+ * fc_linkup - Handler for transport linkup events
+ * @lport: The lport whose link is up
+ */
+void fc_linkup(struct fc_lport *lport)
+{
+ mutex_lock(&lport->lp_mutex);
+ if ((lport->link_status & FC_LINK_UP) != FC_LINK_UP) {
+ lport->link_status |= FC_LINK_UP;
+
+ if (lport->state == LPORT_ST_RESET)
+ fc_lport_enter_flogi(lport);
+ }
+ mutex_unlock(&lport->lp_mutex);
+}
+EXPORT_SYMBOL(fc_linkup);
+
+/**
+ * fc_linkdown - Handler for transport linkdown events
+ * @lport: The lport whose link is down
+ */
+void fc_linkdown(struct fc_lport *lport)
+{
+ mutex_lock(&lport->lp_mutex);
+
+ if ((lport->link_status & FC_LINK_UP) == FC_LINK_UP) {
+ lport->link_status &= ~(FC_LINK_UP);
+ fc_lport_enter_reset(lport);
+ lport->tt.scsi_cleanup(lport);
+ }
+
+ mutex_unlock(&lport->lp_mutex);
+}
+EXPORT_SYMBOL(fc_linkdown);
+
+/**
+ * fc_pause - Pause the flow of frames
+ * @lport: The lport to be paused
+ */
+void fc_pause(struct fc_lport *lport)
+{
+ mutex_lock(&lport->lp_mutex);
+ lport->link_status |= FC_PAUSE;
+ mutex_unlock(&lport->lp_mutex);
+}
+EXPORT_SYMBOL(fc_pause);
+
+/**
+ * fc_unpause - Unpause the flow of frames
+ * @lport: The lport to be unpaused
+ */
+void fc_unpause(struct fc_lport *lport)
+{
+ mutex_lock(&lport->lp_mutex);
+ lport->link_status &= ~(FC_PAUSE);
+ mutex_unlock(&lport->lp_mutex);
+}
+EXPORT_SYMBOL(fc_unpause);
+
+/**
+ * fc_fabric_logoff - Logout of the fabric
+ * @lport: fc_lport pointer to logoff the fabric
+ *
+ * Return value:
+ * 0 for success, -1 for failure
+ **/
+int fc_fabric_logoff(struct fc_lport *lport)
+{
+ mutex_lock(&lport->lp_mutex);
+ fc_lport_enter_logo(lport);
+ lport->tt.scsi_cleanup(lport);
+ mutex_unlock(&lport->lp_mutex);
+ return 0;
+}
+EXPORT_SYMBOL(fc_fabric_logoff);
+
+/**
+ * fc_lport_destroy - unregister a fc_lport
+ * @lport: fc_lport pointer to unregister
+ *
+ * Return value:
+ * None
+ * Note:
+ * exit routine for fc_lport instance
+ * clean-up all the allocated memory
+ * and free up other system resources.
+ *
+ **/
+int fc_lport_destroy(struct fc_lport *lport)
+{
+ if (!cancel_delayed_work(&lport->disc_work))
+ flush_scheduled_work();
+ lport->tt.scsi_abort_io(lport);
+ lport->tt.frame_send = fc_frame_drop;
+ lport->tt.exch_mgr_reset(lport->emp, 0, 0);
+ return 0;
+}
+EXPORT_SYMBOL(fc_lport_destroy);
+
+int fc_set_mfs(struct fc_lport *lport, u32 mfs)
+{
+ unsigned int old_mfs;
+ int rc = -1;
+
+ mutex_lock(&lport->lp_mutex);
+
+ old_mfs = lport->mfs;
+
+ if (mfs >= FC_MIN_MAX_FRAME) {
+ mfs &= ~3;
+ WARN_ON((size_t) mfs < FC_MIN_MAX_FRAME);
+ if (mfs > FC_MAX_FRAME)
+ mfs = FC_MAX_FRAME;
+ mfs -= sizeof(struct fc_frame_header);
+ lport->mfs = mfs;
+ rc = 0;
+ }
+
+ if (!rc && mfs < old_mfs) {
+ lport->disc_done = 0;
+ fc_lport_enter_reset(lport);
+ }
+
+ mutex_unlock(&lport->lp_mutex);
+
+ return rc;
+}
+EXPORT_SYMBOL(fc_set_mfs);
+
+/**
+ * fc_rport_enter_ready - Enter the ready state and start discovery
+ * @lport: Fibre Channel local port that is ready
+ *
+ * Locking Note: The lport lock is expected to be held before calling
+ * this routine.
+ */
+static void fc_lport_enter_ready(struct fc_lport *lport)
+{
+ FC_DEBUG_LPORT("Port (%6x) entered Ready from state %s\n",
+ fc_host_port_id(lport->host), fc_lport_state(lport));
+
+ fc_lport_state_enter(lport, LPORT_ST_READY);
+
+ lport->tt.disc_start(lport);
+}
+
+/**
+ * fc_lport_recv_flogi_req - Receive a FLOGI request
+ * @sp_in: The sequence the FLOGI is on
+ * @rx_fp: The frame the FLOGI is in
+ * @lport: The lport that recieved the request
+ *
+ * A received FLOGI request indicates a point-to-point connection.
+ * Accept it with the common service parameters indicating our N port.
+ * Set up to do a PLOGI if we have the higher-number WWPN.
+ *
+ * Locking Note: The lport lock is exected to be held before calling
+ * this function.
+ */
+static void fc_lport_recv_flogi_req(struct fc_seq *sp_in,
+ struct fc_frame *rx_fp,
+ struct fc_lport *lport)
+{
+ struct fc_frame *fp;
+ struct fc_frame_header *fh;
+ struct fc_seq *sp;
+ struct fc_els_flogi *flp;
+ struct fc_els_flogi *new_flp;
+ u64 remote_wwpn;
+ u32 remote_fid;
+ u32 local_fid;
+ u32 f_ctl;
+
+ FC_DEBUG_LPORT("Received FLOGI request while in state %s\n",
+ fc_lport_state(lport));
+
+ fh = fc_frame_header_get(rx_fp);
+ remote_fid = ntoh24(fh->fh_s_id);
+ flp = fc_frame_payload_get(rx_fp, sizeof(*flp));
+ if (!flp)
+ goto out;
+ remote_wwpn = ntohll(get_unaligned(&flp->fl_wwpn));
+ if (remote_wwpn == lport->wwpn) {
+ FC_DBG("FLOGI from port with same WWPN %llx "
+ "possible configuration error\n", remote_wwpn);
+ goto out;
+ }
+ FC_DBG("FLOGI from port WWPN %llx\n", remote_wwpn);
+
+ /*
+ * XXX what is the right thing to do for FIDs?
+ * The originator might expect our S_ID to be 0xfffffe.
+ * But if so, both of us could end up with the same FID.
+ */
+ local_fid = FC_LOCAL_PTP_FID_LO;
+ if (remote_wwpn < lport->wwpn) {
+ local_fid = FC_LOCAL_PTP_FID_HI;
+ if (!remote_fid || remote_fid == local_fid)
+ remote_fid = FC_LOCAL_PTP_FID_LO;
+ } else if (!remote_fid) {
+ remote_fid = FC_LOCAL_PTP_FID_HI;
+ }
+
+ fc_host_port_id(lport->host) = local_fid;
+
+ fp = fc_frame_alloc(lport, sizeof(*flp));
+ if (fp) {
+ sp = lport->tt.seq_start_next(fr_seq(rx_fp));
+ new_flp = fc_frame_payload_get(fp, sizeof(*flp));
+ fc_lport_flogi_fill(lport, new_flp, ELS_FLOGI);
+ new_flp->fl_cmd = (u8) ELS_LS_ACC;
+
+ /*
+ * Send the response. If this fails, the originator should
+ * repeat the sequence.
+ */
+ f_ctl = FC_FC_LAST_SEQ | FC_FC_END_SEQ;
+ fc_frame_setup(fp, FC_RCTL_ELS_REP, FC_TYPE_ELS);
+ lport->tt.seq_send(lport, sp, fp, f_ctl);
+
+ } else {
+ fc_lport_error(lport, fp);
+ }
+ fc_lport_ptp_setup(lport, remote_fid, remote_wwpn,
+ ntohll(get_unaligned(&flp->fl_wwnn)));
+
+ if (lport->tt.disc_start(lport))
+ FC_DBG("target discovery start error\n");
+out:
+ sp = fr_seq(rx_fp);
+ fc_frame_free(rx_fp);
+}
+
+/**
+ * fc_lport_recv_req - The generic lport request handler
+ * @lport: The lport that received the request
+ * @sp: The sequence the request is on
+ * @fp: The frame the request is in
+ *
+ * This function will see if the lport handles the request or
+ * if an rport should handle the request.
+ *
+ * Locking Note: This function should not be called with the lport
+ * lock held becuase it will grab the lock.
+ */
+static void fc_lport_recv_req(struct fc_lport *lport, struct fc_seq *sp,
+ struct fc_frame *fp)
+{
+ struct fc_frame_header *fh = fc_frame_header_get(fp);
+ void (*recv) (struct fc_seq *, struct fc_frame *, struct fc_lport *);
+ struct fc_rport *rport;
+ u32 s_id;
+ u32 d_id;
+ struct fc_seq_els_data rjt_data;
+
+ mutex_lock(&lport->lp_mutex);
+
+ /*
+ * Handle special ELS cases like FLOGI, LOGO, and
+ * RSCN here. These don't require a session.
+ * Even if we had a session, it might not be ready.
+ */
+ if (fh->fh_type == FC_TYPE_ELS && fh->fh_r_ctl == FC_RCTL_ELS_REQ) {
+ /*
+ * Check opcode.
+ */
+ recv = NULL;
+ switch (fc_frame_payload_op(fp)) {
+ case ELS_FLOGI:
+ recv = fc_lport_recv_flogi_req;
+ break;
+ case ELS_LOGO:
+ fh = fc_frame_header_get(fp);
+ if (ntoh24(fh->fh_s_id) == FC_FID_FLOGI)
+ recv = fc_lport_recv_logo_req;
+ break;
+ case ELS_RSCN:
+ recv = lport->tt.disc_recv_req;
+ break;
+ case ELS_ECHO:
+ recv = fc_lport_recv_echo_req;
+ break;
+ case ELS_RLIR:
+ recv = fc_lport_recv_rlir_req;
+ break;
+ case ELS_RNID:
+ recv = fc_lport_recv_rnid_req;
+ break;
+ }
+
+ if (recv)
+ recv(sp, fp, lport);
+ else {
+ /*
+ * Find session.
+ * If this is a new incoming PLOGI, we won't find it.
+ */
+ s_id = ntoh24(fh->fh_s_id);
+ d_id = ntoh24(fh->fh_d_id);
+
+ rport = fc_lport_lookup_rport(lport, s_id);
+ if (rport) {
+ lport->tt.rport_recv_req(sp, fp, rport);
+ put_device(&rport->dev); /* hold from lookup */
+ } else {
+ rjt_data.fp = NULL;
+ rjt_data.reason = ELS_RJT_UNAB;
+ rjt_data.explan = ELS_EXPL_NONE;
+ lport->tt.seq_els_rsp_send(sp,
+ ELS_LS_RJT,
+ &rjt_data);
+ fc_frame_free(fp);
+ }
+ }
+ } else {
+ FC_DBG("dropping invalid frame (eof %x)\n", fr_eof(fp));
+ fc_frame_free(fp);
+ }
+ mutex_unlock(&lport->lp_mutex);
+
+ /*
+ * The common exch_done for all request may not be good
+ * if any request requires longer hold on exhange. XXX
+ */
+ lport->tt.exch_done(sp);
+}
+
+/**
+ * fc_lport_reset - Reset an lport
+ * @lport: The lport which should be reset
+ *
+ * Locking Note: This functions should not be called with the
+ * lport lock held.
+ */
+int fc_lport_reset(struct fc_lport *lport)
+{
+ mutex_lock(&lport->lp_mutex);
+ fc_lport_enter_reset(lport);
+ mutex_unlock(&lport->lp_mutex);
+ return 0;
+}
+EXPORT_SYMBOL(fc_lport_reset);
+
+/**
+ * fc_lport_stop_rports - delete all the remote ports associated with the lport
+ * @lport: libfc local port instance
+ *
+ * Locking Note: This function expects that the lport mutex is locked before
+ * calling it.
+ */
+void fc_lport_stop_rports(struct fc_lport *lport)
+{
+ struct fc_rport *rport;
+ struct fc_rport_libfc_priv *rdata;
+
+ list_for_each_entry(rdata, &lport->rports, peers) {
+ rport = PRIV_TO_RPORT(rdata);
+ lport->tt.rport_stop(rport);
+ }
+}
+
+/**
+ * fc_rport_enter_reset - Reset the local port
+ * @lport: Fibre Channel local port to be reset
+ *
+ * Locking Note: The lport lock is expected to be held before calling
+ * this routine.
+ */
+static void fc_lport_enter_reset(struct fc_lport *lport)
+{
+ FC_DEBUG_LPORT("Port (%6x) entered RESET state from %s state\n",
+ fc_host_port_id(lport->host), fc_lport_state(lport));
+
+ fc_lport_state_enter(lport, LPORT_ST_RESET);
+
+ if (lport->dns_rp) {
+ lport->tt.rport_stop(lport->dns_rp);
+ lport->dns_rp = NULL;
+ }
+
+ if (lport->ptp_rp) {
+ lport->tt.rport_stop(lport->ptp_rp);
+ lport->ptp_rp = NULL;
+ }
+
+ fc_lport_stop_rports(lport);
+
+ lport->tt.exch_mgr_reset(lport->emp, 0, 0);
+ fc_host_fabric_name(lport->host) = 0;
+ fc_host_port_id(lport->host) = 0;
+
+ if ((lport->link_status & FC_LINK_UP) == FC_LINK_UP)
+ fc_lport_enter_flogi(lport);
+}
+
+/**
+ * fc_lport_error - Handler for any errors
+ * @lport: The fc_lport object
+ * @fp: The frame pointer
+ *
+ * If the error was caused by a resource allocation failure
+ * then wait for half a second and retry, otherwise retry
+ * after the e_d_tov time.
+ */
+static void fc_lport_error(struct fc_lport *lport, struct fc_frame *fp)
+{
+ unsigned long delay = 0;
+ FC_DEBUG_LPORT("Error %ld in state %s, retries %d\n",
+ PTR_ERR(fp), fc_lport_state(lport),
+ lport->retry_count);
+
+ if (!fp || PTR_ERR(fp) == -FC_EX_TIMEOUT) {
+ /*
+ * Memory allocation failure, or the exchange timed out.
+ * Retry after delay
+ */
+ if (lport->retry_count < lport->max_retry_count) {
+ lport->retry_count++;
+ if (!fp)
+ delay = msecs_to_jiffies(500);
+ else
+ delay = msecs_to_jiffies(lport->e_d_tov);
+
+ schedule_delayed_work(&lport->retry_work, delay);
+ } else {
+ switch (lport->state) {
+ case LPORT_ST_NONE:
+ case LPORT_ST_READY:
+ case LPORT_ST_RESET:
+ case LPORT_ST_RPN_ID:
+ case LPORT_ST_RFT_ID:
+ case LPORT_ST_SCR:
+ case LPORT_ST_DNS:
+ case LPORT_ST_FLOGI:
+ case LPORT_ST_LOGO:
+ fc_lport_enter_reset(lport);
+ break;
+ }
+ }
+ }
+}
+
+/**
+ * fc_lport_rft_id_resp - Handle response to Register Fibre
+ * Channel Types by ID (RPN_ID) request
+ * @sp: current sequence in RPN_ID exchange
+ * @fp: response frame
+ * @lp_arg: Fibre Channel host port instance
+ *
+ * Locking Note: This function will be called without the lport lock
+ * held, but it will lock, call an _enter_* function or fc_lport_error
+ * and then unlock the lport.
+ */
+static void fc_lport_rft_id_resp(struct fc_seq *sp, struct fc_frame *fp,
+ void *lp_arg)
+{
+ struct fc_lport *lport = lp_arg;
+ struct fc_frame_header *fh;
+ struct fc_ct_hdr *ct;
+
+ if (fp == ERR_PTR(-FC_EX_CLOSED))
+ return;
+
+ mutex_lock(&lport->lp_mutex);
+
+ FC_DEBUG_LPORT("Received a RFT_ID response\n");
+
+ if (lport->state != LPORT_ST_RFT_ID) {
+ FC_DBG("Received a RFT_ID response, but in state %s\n",
+ fc_lport_state(lport));
+ goto out;
+ }
+
+ if (IS_ERR(fp)) {
+ fc_lport_error(lport, fp);
+ goto err;
+ }
+
+ fh = fc_frame_header_get(fp);
+ ct = fc_frame_payload_get(fp, sizeof(*ct));
+
+ if (fh && ct && fh->fh_type == FC_TYPE_CT &&
+ ct->ct_fs_type == FC_FST_DIR &&
+ ct->ct_fs_subtype == FC_NS_SUBTYPE &&
+ ntohs(ct->ct_cmd) == FC_FS_ACC)
+ fc_lport_enter_scr(lport);
+ else
+ fc_lport_error(lport, fp);
+out:
+ fc_frame_free(fp);
+err:
+ mutex_unlock(&lport->lp_mutex);
+}
+
+/**
+ * fc_lport_rpn_id_resp - Handle response to Register Port
+ * Name by ID (RPN_ID) request
+ * @sp: current sequence in RPN_ID exchange
+ * @fp: response frame
+ * @lp_arg: Fibre Channel host port instance
+ *
+ * Locking Note: This function will be called without the lport lock
+ * held, but it will lock, call an _enter_* function or fc_lport_error
+ * and then unlock the lport.
+ */
+static void fc_lport_rpn_id_resp(struct fc_seq *sp, struct fc_frame *fp,
+ void *lp_arg)
+{
+ struct fc_lport *lport = lp_arg;
+ struct fc_frame_header *fh;
+ struct fc_ct_hdr *ct;
+
+ if (fp == ERR_PTR(-FC_EX_CLOSED))
+ return;
+
+ mutex_lock(&lport->lp_mutex);
+
+ FC_DEBUG_LPORT("Received a RPN_ID response\n");
+
+ if (lport->state != LPORT_ST_RPN_ID) {
+ FC_DBG("Received a RPN_ID response, but in state %s\n",
+ fc_lport_state(lport));
+ goto out;
+ }
+
+ if (IS_ERR(fp)) {
+ fc_lport_error(lport, fp);
+ goto err;
+ }
+
+ fh = fc_frame_header_get(fp);
+ ct = fc_frame_payload_get(fp, sizeof(*ct));
+ if (fh && ct && fh->fh_type == FC_TYPE_CT &&
+ ct->ct_fs_type == FC_FST_DIR &&
+ ct->ct_fs_subtype == FC_NS_SUBTYPE &&
+ ntohs(ct->ct_cmd) == FC_FS_ACC)
+ fc_lport_enter_rft_id(lport);
+ else
+ fc_lport_error(lport, fp);
+
+out:
+ fc_frame_free(fp);
+err:
+ mutex_unlock(&lport->lp_mutex);
+}
+
+/**
+ * fc_lport_scr_resp - Handle response to State Change Register (SCR) request
+ * @sp: current sequence in SCR exchange
+ * @fp: response frame
+ * @lp_arg: Fibre Channel lport port instance that sent the registration request
+ *
+ * Locking Note: This function will be called without the lport lock
+ * held, but it will lock, call an _enter_* function or fc_lport_error
+ * and then unlock the lport.
+ */
+static void fc_lport_scr_resp(struct fc_seq *sp, struct fc_frame *fp,
+ void *lp_arg)
+{
+ struct fc_lport *lport = lp_arg;
+ u8 op;
+
+ if (fp == ERR_PTR(-FC_EX_CLOSED))
+ return;
+
+ mutex_lock(&lport->lp_mutex);
+
+ FC_DEBUG_LPORT("Received a SCR response\n");
+
+ if (lport->state != LPORT_ST_SCR) {
+ FC_DBG("Received a SCR response, but in state %s\n",
+ fc_lport_state(lport));
+ goto out;
+ }
+
+ if (IS_ERR(fp)) {
+ fc_lport_error(lport, fp);
+ goto err;
+ }
+
+ op = fc_frame_payload_op(fp);
+ if (op == ELS_LS_ACC)
+ fc_lport_enter_ready(lport);
+ else
+ fc_lport_error(lport, fp);
+
+out:
+ fc_frame_free(fp);
+err:
+ mutex_unlock(&lport->lp_mutex);
+}
+
+/**
+ * fc_lport_enter_scr - Send a State Change Register (SCR) request
+ * @lport: Fibre Channel local port to register for state changes
+ *
+ * Locking Note: The lport lock is expected to be held before calling
+ * this routine.
+ */
+static void fc_lport_enter_scr(struct fc_lport *lport)
+{
+ struct fc_frame *fp;
+ struct fc_els_scr *scr;
+
+ FC_DEBUG_LPORT("Port (%6x) entered SCR state from %s state\n",
+ fc_host_port_id(lport->host), fc_lport_state(lport));
+
+ fc_lport_state_enter(lport, LPORT_ST_SCR);
+
+ fp = fc_frame_alloc(lport, sizeof(*scr));
+ if (!fp) {
+ fc_lport_error(lport, fp);
+ return;
+ }
+
+ scr = fc_frame_payload_get(fp, sizeof(*scr));
+ memset(scr, 0, sizeof(*scr));
+ scr->scr_cmd = ELS_SCR;
+ scr->scr_reg_func = ELS_SCRF_FULL;
+ fc_frame_setup(fp, FC_RCTL_ELS_REQ, FC_TYPE_ELS);
+ fc_frame_set_offset(fp, 0);
+
+ if (!lport->tt.exch_seq_send(lport, fp,
+ fc_lport_scr_resp, NULL,
+ lport, lport->e_d_tov,
+ fc_host_port_id(lport->host),
+ FC_FID_FCTRL,
+ FC_FC_SEQ_INIT | FC_FC_END_SEQ))
+ fc_lport_error(lport, fp);
+}
+
+/**
+ * fc_lport_enter_rft_id - Register FC4-types with the name server
+ * @lport: Fibre Channel local port to register
+ *
+ * Locking Note: The lport lock is expected to be held before calling
+ * this routine.
+ */
+static void fc_lport_enter_rft_id(struct fc_lport *lport)
+{
+ struct fc_frame *fp;
+ struct req {
+ struct fc_ct_hdr ct;
+ struct fc_ns_fid fid; /* port ID object */
+ struct fc_ns_fts fts; /* FC4-types object */
+ } *req;
+ struct fc_ns_fts *lps;
+ int i;
+
+ FC_DEBUG_LPORT("Port (%6x) entered RFT_ID state from %s state\n",
+ fc_host_port_id(lport->host), fc_lport_state(lport));
+
+ fc_lport_state_enter(lport, LPORT_ST_RFT_ID);
+
+ lps = &lport->fcts;
+ i = sizeof(lps->ff_type_map) / sizeof(lps->ff_type_map[0]);
+ while (--i >= 0)
+ if (ntohl(lps->ff_type_map[i]) != 0)
+ break;
+ if (i < 0) {
+ /* nothing to register, move on to SCR */
+ fc_lport_enter_scr(lport);
+ } else {
+ fp = fc_frame_alloc(lport, sizeof(*req));
+ if (!fp) {
+ fc_lport_error(lport, fp);
+ return;
+ }
+
+ req = fc_frame_payload_get(fp, sizeof(*req));
+ fc_fill_dns_hdr(lport, &req->ct,
+ FC_NS_RFT_ID,
+ sizeof(*req) -
+ sizeof(struct fc_ct_hdr));
+ hton24(req->fid.fp_fid, fc_host_port_id(lport->host));
+ req->fts = *lps;
+ fc_frame_setup(fp, FC_RCTL_DD_UNSOL_CTL, FC_TYPE_CT);
+
+ if (!lport->tt.exch_seq_send(lport, fp,
+ fc_lport_rft_id_resp, NULL,
+ lport, lport->e_d_tov,
+ fc_host_port_id(lport->host),
+ FC_FID_DIR_SERV,
+ FC_FC_SEQ_INIT |
+ FC_FC_END_SEQ))
+ fc_lport_error(lport, fp);
+ }
+}
+
+/**
+ * fc_rport_enter_rft_id - Register port name with the name server
+ * @lport: Fibre Channel local port to register
+ *
+ * Locking Note: The lport lock is expected to be held before calling
+ * this routine.
+ */
+static void fc_lport_enter_rpn_id(struct fc_lport *lport)
+{
+ struct fc_frame *fp;
+ struct req {
+ struct fc_ct_hdr ct;
+ struct fc_ns_rn_id rn;
+ } *req;
+
+ FC_DEBUG_LPORT("Port (%6x) entered RPN_ID state from %s state\n",
+ fc_host_port_id(lport->host), fc_lport_state(lport));
+
+ fc_lport_state_enter(lport, LPORT_ST_RPN_ID);
+
+ fp = fc_frame_alloc(lport, sizeof(*req));
+ if (!fp) {
+ fc_lport_error(lport, fp);
+ return;
+ }
+
+ req = fc_frame_payload_get(fp, sizeof(*req));
+ memset(req, 0, sizeof(*req));
+ fc_fill_dns_hdr(lport, &req->ct, FC_NS_RPN_ID, sizeof(req->rn));
+ hton24(req->rn.fr_fid.fp_fid, fc_host_port_id(lport->host));
+ put_unaligned(htonll(lport->wwpn), &req->rn.fr_wwn);
+ fc_frame_setup(fp, FC_RCTL_DD_UNSOL_CTL, FC_TYPE_CT);
+
+ if (!lport->tt.exch_seq_send(lport, fp,
+ fc_lport_rpn_id_resp, NULL,
+ lport, lport->e_d_tov,
+ fc_host_port_id(lport->host),
+ FC_FID_DIR_SERV,
+ FC_FC_SEQ_INIT | FC_FC_END_SEQ))
+ fc_lport_error(lport, fp);
+
+}
+
+/**
+ * fc_rport_enter_dns - Create a rport to the name server
+ * @lport: Fibre Channel local port requesting a rport for the name server
+ *
+ * Locking Note: The lport lock is expected to be held before calling
+ * this routine.
+ */
+static void fc_lport_enter_dns(struct fc_lport *lport)
+{
+ struct fc_rport *rport;
+ struct fc_rport_libfc_priv *rdata;
+ struct fc_disc_port dp;
+
+ dp.ids.port_id = FC_FID_DIR_SERV;
+ dp.ids.port_name = -1;
+ dp.ids.node_name = -1;
+ dp.ids.roles = FC_RPORT_ROLE_UNKNOWN;
+ dp.lp = lport;
+
+ FC_DEBUG_LPORT("Port (%6x) entered DNS state from %s state\n",
+ fc_host_port_id(lport->host), fc_lport_state(lport));
+
+ fc_lport_state_enter(lport, LPORT_ST_DNS);
+
+ if (!lport->dns_rp) {
+ /* Set up a rogue rport to directory server */
+ rport = fc_rport_rogue_create(&dp);
+
+ if (!rport)
+ goto err;
+ lport->dns_rp = rport;
+ }
+
+ rport = lport->dns_rp;
+ rdata = rport->dd_data;
+ rdata->event_callback = fc_lport_rport_event;
+ lport->tt.rport_login(rport);
+ return;
+
+err:
+ fc_lport_error(lport, NULL);
+}
+
+/**
+ * fc_lport_timeout - Handler for the retry_work timer.
+ * @work: The work struct of the fc_lport
+ */
+static void fc_lport_timeout(void *data)
+{
+ struct fc_lport *lport = data;
+
+ mutex_lock(&lport->lp_mutex);
+
+ switch (lport->state) {
+ case LPORT_ST_NONE:
+ case LPORT_ST_READY:
+ case LPORT_ST_RESET:
+ WARN_ON(1);
+ break;
+ case LPORT_ST_FLOGI:
+ fc_lport_enter_flogi(lport);
+ break;
+ case LPORT_ST_DNS:
+ fc_lport_enter_dns(lport);
+ break;
+ case LPORT_ST_RPN_ID:
+ fc_lport_enter_rpn_id(lport);
+ break;
+ case LPORT_ST_RFT_ID:
+ fc_lport_enter_rft_id(lport);
+ break;
+ case LPORT_ST_SCR:
+ fc_lport_enter_scr(lport);
+ break;
+ case LPORT_ST_LOGO:
+ fc_lport_enter_logo(lport);
+ break;
+ }
+
+ mutex_unlock(&lport->lp_mutex);
+}
+
+/**
+ * fc_lport_logo_resp - Handle response to LOGO request
+ * @sp: current sequence in LOGO exchange
+ * @fp: response frame
+ * @lp_arg: Fibre Channel lport port instance that sent the LOGO request
+ *
+ * Locking Note: This function will be called without the lport lock
+ * held, but it will lock, call an _enter_* function or fc_lport_error
+ * and then unlock the lport.
+ */
+static void fc_lport_logo_resp(struct fc_seq *sp, struct fc_frame *fp,
+ void *lp_arg)
+{
+ struct fc_lport *lport = lp_arg;
+ u8 op;
+
+ if (fp == ERR_PTR(-FC_EX_CLOSED))
+ return;
+
+ mutex_lock(&lport->lp_mutex);
+
+ FC_DEBUG_LPORT("Received a LOGO response\n");
+
+ if (lport->state != LPORT_ST_LOGO) {
+ FC_DBG("Received a LOGO response, but in state %s\n",
+ fc_lport_state(lport));
+ goto out;
+ }
+
+ if (IS_ERR(fp)) {
+ fc_lport_error(lport, fp);
+ goto err;
+ }
+
+ op = fc_frame_payload_op(fp);
+ if (op == ELS_LS_ACC)
+ fc_lport_enter_reset(lport);
+ else
+ fc_lport_error(lport, fp);
+
+out:
+ fc_frame_free(fp);
+err:
+ mutex_unlock(&lport->lp_mutex);
+}
+
+/**
+ * fc_rport_enter_logo - Logout of the fabric
+ * @lport: Fibre Channel local port to be logged out
+ *
+ * Locking Note: The lport lock is expected to be held before calling
+ * this routine.
+ */
+static void fc_lport_enter_logo(struct fc_lport *lport)
+{
+ struct fc_frame *fp;
+ struct fc_els_logo *logo;
+
+ FC_DEBUG_LPORT("Port (%6x) entered LOGO state from %s state\n",
+ fc_host_port_id(lport->host), fc_lport_state(lport));
+
+ fc_lport_state_enter(lport, LPORT_ST_LOGO);
+
+ /* DNS session should be closed so we can release it here */
+ if (lport->dns_rp) {
+ lport->tt.rport_logout(lport->dns_rp);
+ lport->dns_rp = NULL;
+ }
+
+ fp = fc_frame_alloc(lport, sizeof(*logo));
+ if (!fp) {
+ fc_lport_error(lport, fp);
+ return;
+ }
+
+ logo = fc_frame_payload_get(fp, sizeof(*logo));
+ memset(logo, 0, sizeof(*logo));
+ logo->fl_cmd = ELS_LOGO;
+ hton24(logo->fl_n_port_id, fc_host_port_id(lport->host));
+ logo->fl_n_port_wwn = htonll(lport->wwpn);
+ fc_frame_setup(fp, FC_RCTL_ELS_REQ, FC_TYPE_ELS);
+ fc_frame_set_offset(fp, 0);
+
+ if (!lport->tt.exch_seq_send(lport, fp,
+ fc_lport_logo_resp, NULL,
+ lport, lport->e_d_tov,
+ fc_host_port_id(lport->host), FC_FID_FLOGI,
+ FC_FC_SEQ_INIT | FC_FC_END_SEQ))
+ fc_lport_error(lport, fp);
+}
+
+/**
+ * fc_lport_flogi_resp - Handle response to FLOGI request
+ * @sp: current sequence in FLOGI exchange
+ * @fp: response frame
+ * @lp_arg: Fibre Channel lport port instance that sent the FLOGI request
+ *
+ * Locking Note: This function will be called without the lport lock
+ * held, but it will lock, call an _enter_* function or fc_lport_error
+ * and then unlock the lport.
+ */
+static void fc_lport_flogi_resp(struct fc_seq *sp, struct fc_frame *fp,
+ void *lp_arg)
+{
+ struct fc_lport *lport = lp_arg;
+ struct fc_frame_header *fh;
+ struct fc_els_flogi *flp;
+ u32 did;
+ u16 csp_flags;
+ unsigned int r_a_tov;
+ unsigned int e_d_tov;
+ u16 mfs;
+
+ if (fp == ERR_PTR(-FC_EX_CLOSED))
+ return;
+
+ mutex_lock(&lport->lp_mutex);
+
+ FC_DEBUG_LPORT("Received a FLOGI response\n");
+
+ if (lport->state != LPORT_ST_FLOGI) {
+ FC_DBG("Received a FLOGI response, but in state %s\n",
+ fc_lport_state(lport));
+ goto out;
+ }
+
+ if (IS_ERR(fp)) {
+ fc_lport_error(lport, fp);
+ goto err;
+ }
+
+ fh = fc_frame_header_get(fp);
+ did = ntoh24(fh->fh_d_id);
+ if (fc_frame_payload_op(fp) == ELS_LS_ACC && did != 0) {
+
+ FC_DEBUG_LPORT("Assigned fid %x\n", did);
+ fc_host_port_id(lport->host) = did;
+
+ flp = fc_frame_payload_get(fp, sizeof(*flp));
+ if (flp) {
+ mfs = ntohs(flp->fl_csp.sp_bb_data) &
+ FC_SP_BB_DATA_MASK;
+ if (mfs >= FC_SP_MIN_MAX_PAYLOAD &&
+ mfs < lport->mfs)
+ lport->mfs = mfs;
+ csp_flags = ntohs(flp->fl_csp.sp_features);
+ r_a_tov = ntohl(flp->fl_csp.sp_r_a_tov);
+ e_d_tov = ntohl(flp->fl_csp.sp_e_d_tov);
+ if (csp_flags & FC_SP_FT_EDTR)
+ e_d_tov /= 1000000;
+ if ((csp_flags & FC_SP_FT_FPORT) == 0) {
+ if (e_d_tov > lport->e_d_tov)
+ lport->e_d_tov = e_d_tov;
+ lport->r_a_tov = 2 * e_d_tov;
+ FC_DBG("Point-to-Point mode\n");
+ fc_lport_ptp_setup(lport, ntoh24(fh->fh_s_id),
+ ntohll(get_unaligned(&flp->fl_wwpn)),
+ ntohll(get_unaligned(&flp->fl_wwnn)));
+ } else {
+ lport->e_d_tov = e_d_tov;
+ lport->r_a_tov = r_a_tov;
+ fc_host_fabric_name(lport->host) =
+ ntohll(get_unaligned(&flp->fl_wwnn));
+ fc_lport_enter_dns(lport);
+ }
+ }
+
+ if (flp) {
+ csp_flags = ntohs(flp->fl_csp.sp_features);
+ if ((csp_flags & FC_SP_FT_FPORT) == 0) {
+ if (lport->tt.disc_start(lport))
+ FC_DBG("Target disc start error\n");
+ }
+ }
+ } else {
+ FC_DBG("bad FLOGI response\n");
+ }
+
+out:
+ fc_frame_free(fp);
+err:
+ mutex_unlock(&lport->lp_mutex);
+}
+
+/**
+ * fc_rport_enter_flogi - Send a FLOGI request to the fabric manager
+ * @lport: Fibre Channel local port to be logged in to the fabric
+ *
+ * Locking Note: The lport lock is expected to be held before calling
+ * this routine.
+ */
+void fc_lport_enter_flogi(struct fc_lport *lport)
+{
+ struct fc_frame *fp;
+ struct fc_els_flogi *flp;
+
+ FC_DEBUG_LPORT("Processing FLOGI state\n");
+
+ fc_lport_state_enter(lport, LPORT_ST_FLOGI);
+
+ fp = fc_frame_alloc(lport, sizeof(*flp));
+ if (!fp)
+ return fc_lport_error(lport, fp);
+
+ flp = fc_frame_payload_get(fp, sizeof(*flp));
+ fc_lport_flogi_fill(lport, flp, ELS_FLOGI);
+
+ fc_frame_setup(fp, FC_RCTL_ELS_REQ, FC_TYPE_ELS);
+ fc_frame_set_offset(fp, 0);
+
+ if (!lport->tt.exch_seq_send(lport, fp,
+ fc_lport_flogi_resp, NULL,
+ lport, lport->e_d_tov,
+ 0, FC_FID_FLOGI,
+ FC_FC_SEQ_INIT | FC_FC_END_SEQ))
+ fc_lport_error(lport, fp);
+
+}
+
+/* Configure a fc_lport */
+int fc_lport_config(struct fc_lport *lport)
+{
+ INIT_WORK(&lport->retry_work, fc_lport_timeout, lport);
+ mutex_init(&lport->lp_mutex);
+ INIT_LIST_HEAD(&lport->rports);
+
+ fc_lport_state_enter(lport, LPORT_ST_NONE);
+
+ lport->disc_delay = DNS_DELAY;
+
+ fc_lport_add_fc4_type(lport, FC_TYPE_FCP);
+ fc_lport_add_fc4_type(lport, FC_TYPE_CT);
+
+ return 0;
+}
+EXPORT_SYMBOL(fc_lport_config);
+
+int fc_lport_init(struct fc_lport *lport)
+{
+ if (!lport->tt.lport_recv)
+ lport->tt.lport_recv = fc_lport_recv_req;
+
+ if (!lport->tt.lport_reset)
+ lport->tt.lport_reset = fc_lport_reset;
+
+ if (!lport->tt.rport_lookup)
+ lport->tt.rport_lookup = fc_lport_lookup_rport;
+
+ if (!lport->tt.event_callback)
+ lport->tt.event_callback = fc_lport_rport_event;
+
+ fc_host_port_type(lport->host) = FC_PORTTYPE_NPORT;
+ fc_host_node_name(lport->host) = lport->wwnn;
+ fc_host_port_name(lport->host) = lport->wwpn;
+ fc_host_supported_classes(lport->host) = FC_COS_CLASS3;
+ memset(fc_host_supported_fc4s(lport->host), 0,
+ sizeof(fc_host_supported_fc4s(lport->host)));
+ fc_host_supported_fc4s(lport->host)[2] = 1;
+ fc_host_supported_fc4s(lport->host)[7] = 1;
+
+ /* This value is also unchanging */
+ memset(fc_host_active_fc4s(lport->host), 0,
+ sizeof(fc_host_active_fc4s(lport->host)));
+ fc_host_active_fc4s(lport->host)[2] = 1;
+ fc_host_active_fc4s(lport->host)[7] = 1;
+ fc_host_maxframe_size(lport->host) = lport->mfs;
+ fc_host_supported_speeds(lport->host) = 0;
+ if (lport->link_supported_speeds & FC_PORTSPEED_1GBIT)
+ fc_host_supported_speeds(lport->host) |= FC_PORTSPEED_1GBIT;
+ if (lport->link_supported_speeds & FC_PORTSPEED_10GBIT)
+ fc_host_supported_speeds(lport->host) |= FC_PORTSPEED_10GBIT;
+
+ return 0;
+}
+EXPORT_SYMBOL(fc_lport_init);
diff --git a/drivers/scsi/libfc/fc_rport.c b/drivers/scsi/libfc/fc_rport.c
new file mode 100644
index 0000000..51851da
--- /dev/null
+++ b/drivers/scsi/libfc/fc_rport.c
@@ -0,0 +1,1357 @@
+/*
+ * Copyright(c) 2007 - 2008 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Maintained at www.Open-FCoE.org
+ */
+
+/*
+ * This file contains all processing regarding fc_rports. It contains the
+ * rport state machine and does all rport interaction with the transport class.
+ * There should be no other places in libfc that interact directly with the
+ * transport class in regards to adding and deleting rports.
+ *
+ * fc_rport's represent N_Port's within the fabric.
+ *
+ * rport locking notes:
+ *
+ * The rport should never hold the rport mutex and then lock the lport
+ * mutex. The rport's mutex is considered lesser than the lport's mutex, so
+ * the lport mutex can be held before locking the rport mutex, but not the
+ * other way around. See the comment block at the top of fc_lport.c for more
+ * details.
+ *
+ * The locking strategy is similar to the lport's strategy. The lock protects
+ * the rport's states and is held and released by the entry points to the rport
+ * block. All _enter_* functions correspond to rport states and expect the rport
+ * mutex to be locked before calling them. This means that rports only handle one
+ * request or response at a time, since they're not critical for the I/O path
+ * this potential over-use of the mutex is acceptable.
+ */
+
+#include <linux/kernel.h>
+#include <linux/spinlock.h>
+#include <linux/interrupt.h>
+#include <linux/rcupdate.h>
+#include <linux/timer.h>
+#include <linux/workqueue.h>
+#include <asm/unaligned.h>
+
+#include <scsi/libfc/libfc.h>
+
+static int fc_rport_debug;
+
+#define FC_DEBUG_RPORT(fmt...) \
+ do { \
+ if (fc_rport_debug) \
+ FC_DBG(fmt); \
+ } while (0)
+
+static struct workqueue_struct *rport_event_queue;
+
+static void fc_rport_enter_plogi(struct fc_rport *);
+static void fc_rport_enter_prli(struct fc_rport *);
+static void fc_rport_enter_rtv(struct fc_rport *);
+static void fc_rport_enter_ready(struct fc_rport *);
+static void fc_rport_enter_logo(struct fc_rport *);
+
+static void fc_rport_recv_plogi_req(struct fc_rport *,
+ struct fc_seq *, struct fc_frame *);
+static void fc_rport_recv_prli_req(struct fc_rport *,
+ struct fc_seq *, struct fc_frame *);
+static void fc_rport_recv_prlo_req(struct fc_rport *,
+ struct fc_seq *, struct fc_frame *);
+static void fc_rport_recv_logo_req(struct fc_rport *,
+ struct fc_seq *, struct fc_frame *);
+static void fc_rport_timeout(void *);
+static void fc_rport_error(struct fc_rport *, struct fc_frame *);
+static void fc_rport_work(void *);
+
+static const char *fc_rport_state_names[] = {
+ [RPORT_ST_NONE] = "None",
+ [RPORT_ST_INIT] = "Init",
+ [RPORT_ST_PLOGI] = "PLOGI",
+ [RPORT_ST_PRLI] = "PRLI",
+ [RPORT_ST_RTV] = "RTV",
+ [RPORT_ST_READY] = "Ready",
+ [RPORT_ST_LOGO] = "LOGO",
+};
+
+struct fc_rport *fc_rport_rogue_create(struct fc_disc_port *dp)
+{
+ struct fc_rport *rport;
+ struct fc_rport_libfc_priv *rdata;
+ rport = kzalloc(sizeof(*rport) + sizeof(*rdata), GFP_KERNEL);
+
+ if (!rport)
+ return NULL;
+
+ rdata = RPORT_TO_PRIV(rport);
+
+ rport->dd_data = rdata;
+ rport->port_id = dp->ids.port_id;
+ rport->port_name = dp->ids.port_name;
+ rport->node_name = dp->ids.node_name;
+ rport->roles = dp->ids.roles;
+ rport->maxframe_size = FC_MIN_MAX_PAYLOAD;
+ /*
+ * init the device, so other code can manipulate the rport as if
+ * it came from the fc class. We also do an extra get because
+ * libfc will free this rport instead of relying on the normal
+ * refcounting.
+ *
+ * Note: all this libfc rogue rport code will be removed for
+ * upstream so it fine that this is really ugly and hacky right now.
+ */
+ device_initialize(&rport->dev);
+ get_device(&rport->dev);
+
+ mutex_init(&rdata->rp_mutex);
+ rdata->local_port = dp->lp;
+ rdata->trans_state = FC_PORTSTATE_ROGUE;
+ rdata->rp_state = RPORT_ST_INIT;
+ rdata->event = LPORT_EV_RPORT_NONE;
+ rdata->flags = FC_RP_FLAGS_REC_SUPPORTED;
+ rdata->event_callback = NULL;
+ rdata->e_d_tov = dp->lp->e_d_tov;
+ rdata->r_a_tov = dp->lp->r_a_tov;
+ INIT_WORK(&rdata->retry_work, fc_rport_timeout, rdata);
+ INIT_WORK(&rdata->event_work, fc_rport_work, rdata);
+ /*
+ * For good measure, but not necessary as we should only
+ * add REAL rport to the lport list.
+ */
+ INIT_LIST_HEAD(&rdata->peers);
+
+ return rport;
+}
+
+void fc_rport_rogue_destroy(struct fc_rport *rport)
+{
+ kfree(rport);
+}
+
+/**
+ * fc_rport_state - return a string for the state the rport is in
+ * @rport: The rport whose state we want to get a string for
+ */
+static const char *fc_rport_state(struct fc_rport *rport)
+{
+ const char *cp;
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+
+ cp = fc_rport_state_names[rdata->rp_state];
+ if (!cp)
+ cp = "Unknown";
+ return cp;
+}
+
+/**
+ * fc_set_rport_loss_tmo - Set the remote port loss timeout in seconds.
+ * @rport: Pointer to Fibre Channel remote port structure
+ * @timeout: timeout in seconds
+ */
+void fc_set_rport_loss_tmo(struct fc_rport *rport, u32 timeout)
+{
+ if (timeout)
+ rport->dev_loss_tmo = timeout + 5;
+ else
+ rport->dev_loss_tmo = 30;
+}
+EXPORT_SYMBOL(fc_set_rport_loss_tmo);
+
+/**
+ * fc_plogi_get_maxframe - Get max payload from the common service parameters
+ * @flp: FLOGI payload structure
+ * @maxval: upper limit, may be less than what is in the service parameters
+ */
+static unsigned int
+fc_plogi_get_maxframe(struct fc_els_flogi *flp, unsigned int maxval)
+{
+ unsigned int mfs;
+
+ /*
+ * Get max payload from the common service parameters and the
+ * class 3 receive data field size.
+ */
+ mfs = ntohs(flp->fl_csp.sp_bb_data) & FC_SP_BB_DATA_MASK;
+ if (mfs >= FC_SP_MIN_MAX_PAYLOAD && mfs < maxval)
+ maxval = mfs;
+ mfs = ntohs(flp->fl_cssp[3 - 1].cp_rdfs);
+ if (mfs >= FC_SP_MIN_MAX_PAYLOAD && mfs < maxval)
+ maxval = mfs;
+ return maxval;
+}
+
+/**
+ * fc_lport_plogi_fill - Fill in PLOGI command for request
+ * @lport: Fibre Channel host port instance
+ * @plogi: PLOGI command structure to fill (same structure as FLOGI)
+ * @op: either ELS_PLOGI for a localy generated request, or ELS_LS_ACC
+ */
+static void
+fc_lport_plogi_fill(struct fc_lport *lport,
+ struct fc_els_flogi *plogi, unsigned int op)
+{
+ struct fc_els_csp *sp;
+ struct fc_els_cssp *cp;
+
+ memset(plogi, 0, sizeof(*plogi));
+ plogi->fl_cmd = (u8) op;
+ put_unaligned(htonll(lport->wwpn), &plogi->fl_wwpn);
+ put_unaligned(htonll(lport->wwnn), &plogi->fl_wwnn);
+
+ sp = &plogi->fl_csp;
+ sp->sp_hi_ver = 0x20;
+ sp->sp_lo_ver = 0x20;
+ sp->sp_bb_cred = htons(10); /* this gets set by gateway */
+ sp->sp_bb_data = htons((u16) lport->mfs);
+ cp = &plogi->fl_cssp[3 - 1]; /* class 3 parameters */
+ cp->cp_class = htons(FC_CPC_VALID | FC_CPC_SEQ);
+ if (op != ELS_FLOGI) {
+ sp->sp_features = htons(FC_SP_FT_CIRO);
+ sp->sp_tot_seq = htons(255); /* seq. we accept */
+ sp->sp_rel_off = htons(0x1f);
+ sp->sp_e_d_tov = htonl(lport->e_d_tov);
+
+ cp->cp_rdfs = htons((u16) lport->mfs);
+ cp->cp_con_seq = htons(255);
+ cp->cp_open_seq = 1;
+ }
+}
+
+/**
+ * fc_rport_state_enter - Change the rport's state
+ * @rport: The rport whose state should change
+ * @new: The new state of the rport
+ *
+ * Locking Note: Called with the rport lock held
+ */
+static void fc_rport_state_enter(struct fc_rport *rport,
+ enum fc_rport_state new)
+{
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+ if (rdata->rp_state != new)
+ rdata->retries = 0;
+ rdata->rp_state = new;
+}
+
+static void fc_rport_work(void *data)
+{
+ struct fc_rport_libfc_priv *rdata = data;
+ enum fc_lport_event event;
+ enum fc_rport_trans_state trans_state;
+ struct fc_lport *lport = rdata->local_port;
+ void (*event_callback)(struct fc_lport *, struct fc_rport *,
+ enum fc_lport_event);
+ struct fc_rport *rport = PRIV_TO_RPORT(rdata);
+
+ mutex_lock(&rdata->rp_mutex);
+ event = rdata->event;
+ event_callback = rdata->event_callback;
+
+ if (event == LPORT_EV_RPORT_CREATED) {
+ struct fc_rport *new_rport;
+ struct fc_rport_libfc_priv *new_rdata;
+ struct fc_rport_identifiers ids;
+
+ ids.port_id = rport->port_id;
+ ids.roles = rport->roles;
+ ids.port_name = rport->port_name;
+ ids.node_name = rport->node_name;
+
+ mutex_unlock(&rdata->rp_mutex);
+
+ new_rport = fc_remote_port_add(lport->host, 0, &ids);
+ if (new_rport) {
+ /*
+ * Switch from the rogue rport to the rport
+ * returned by the FC class.
+ */
+ new_rport->maxframe_size = rport->maxframe_size;
+
+ new_rdata = new_rport->dd_data;
+ new_rdata->e_d_tov = rdata->e_d_tov;
+ new_rdata->r_a_tov = rdata->r_a_tov;
+ new_rdata->event_callback = rdata->event_callback;
+ new_rdata->local_port = rdata->local_port;
+ new_rdata->flags = FC_RP_FLAGS_REC_SUPPORTED;
+ new_rdata->trans_state = FC_PORTSTATE_REAL;
+ mutex_init(&new_rdata->rp_mutex);
+ INIT_WORK(&new_rdata->retry_work, fc_rport_timeout,
+ new_rdata);
+ INIT_LIST_HEAD(&new_rdata->peers);
+ INIT_WORK(&new_rdata->event_work, fc_rport_work,
+ new_rdata);
+
+ fc_rport_state_enter(new_rport, RPORT_ST_READY);
+ } else {
+ FC_DBG("Failed to create the rport for port "
+ "(%6x).\n", ids.port_id);
+ event = LPORT_EV_RPORT_FAILED;
+ }
+ fc_rport_rogue_destroy(rport);
+ rport = new_rport;
+ rdata = new_rport->dd_data;
+ event_callback(lport, rport, event);
+ } else if ((event == LPORT_EV_RPORT_FAILED) ||
+ (event == LPORT_EV_RPORT_LOGO) ||
+ (event == LPORT_EV_RPORT_STOP)) {
+
+ trans_state = rdata->trans_state;
+ mutex_unlock(&rdata->rp_mutex);
+ event_callback(lport, rport, event);
+ if (trans_state == FC_PORTSTATE_ROGUE)
+ fc_rport_rogue_destroy(rport);
+ else
+ fc_remote_port_delete(rport);
+ } else
+ mutex_unlock(&rdata->rp_mutex);
+}
+
+/**
+ * fc_rport_login - Start the remote port login state machine
+ * @rport: Fibre Channel remote port
+ *
+ * Locking Note: Called without the rport lock held. This
+ * function will hold the rport lock, call an _enter_*
+ * function and then unlock the rport.
+ */
+int fc_rport_login(struct fc_rport *rport)
+{
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+
+ mutex_lock(&rdata->rp_mutex);
+
+ FC_DEBUG_RPORT("Login to port (%6x)\n", rport->port_id);
+
+ fc_rport_enter_plogi(rport);
+
+ mutex_unlock(&rdata->rp_mutex);
+
+ return 0;
+}
+
+/**
+ * fc_rport_logout - Logout of the remote port and delete it
+ * @rport: Fibre Channel remote port
+ *
+ * Locking Note: Called without the rport lock held. This
+ * function will hold the rport lock, call an _enter_*
+ * function and then unlock the rport.
+ */
+int fc_rport_logout(struct fc_rport *rport)
+{
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+
+ mutex_lock(&rdata->rp_mutex);
+
+ FC_DEBUG_RPORT("Logout of port (%6x)\n", rport->port_id);
+
+ fc_rport_enter_logo(rport);
+
+ mutex_unlock(&rdata->rp_mutex);
+
+ return 0;
+}
+
+/**
+ * fc_rport_remove - Remove an rport
+ * @rport: Fibre Channel remote port to be removed
+ *
+ * Locking Note: Called without the rport lock held. This
+ * function will hold the rport lock, call an _enter_*
+ * function and then unlock the rport.
+ */
+int fc_rport_stop(struct fc_rport *rport)
+{
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+
+ mutex_lock(&rdata->rp_mutex);
+
+ FC_DEBUG_RPORT("Remove port (%6x)\n", rport->port_id);
+
+ rdata->event = LPORT_EV_RPORT_STOP;
+ queue_work(rport_event_queue, &rdata->event_work);
+
+ mutex_unlock(&rdata->rp_mutex);
+
+ return 0;
+}
+
+/**
+ * fc_rport_enter_ready - The rport is ready
+ * @rport: Fibre Channel remote port that is ready
+ *
+ * Locking Note: The rport lock is expected to be held before calling
+ * this routine.
+ */
+static void fc_rport_enter_ready(struct fc_rport *rport)
+{
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+
+ fc_rport_state_enter(rport, RPORT_ST_READY);
+
+ FC_DEBUG_RPORT("Port (%6x) is Ready\n", rport->port_id);
+
+ rdata->event = LPORT_EV_RPORT_CREATED;
+ queue_work(rport_event_queue, &rdata->event_work);
+}
+
+/**
+ * fc_rport_timeout - Handler for the retry_work timer.
+ * @work: The work struct of the fc_rport_libfc_priv
+ *
+ * Locking Note: Called without the rport lock held. This
+ * function will hold the rport lock, call an _enter_*
+ * function and then unlock the rport.
+ */
+static void fc_rport_timeout(void *data)
+{
+ struct fc_rport_libfc_priv *rdata = data;
+ struct fc_rport *rport = PRIV_TO_RPORT(rdata);
+
+ mutex_lock(&rdata->rp_mutex);
+
+ switch (rdata->rp_state) {
+ case RPORT_ST_PLOGI:
+ fc_rport_enter_plogi(rport);
+ break;
+ case RPORT_ST_PRLI:
+ fc_rport_enter_prli(rport);
+ break;
+ case RPORT_ST_RTV:
+ fc_rport_enter_rtv(rport);
+ break;
+ case RPORT_ST_LOGO:
+ fc_rport_enter_logo(rport);
+ break;
+ case RPORT_ST_READY:
+ case RPORT_ST_INIT:
+ break;
+ case RPORT_ST_NONE:
+ BUG();
+ break;
+ }
+ put_device(&rport->dev);
+
+ mutex_unlock(&rdata->rp_mutex);
+}
+
+/**
+ * fc_rport_error - Handler for any errors
+ * @rport: The fc_rport object
+ * @fp: The frame pointer
+ *
+ * If the error was caused by a resource allocation failure
+ * then wait for half a second and retry, otherwise retry
+ * immediately.
+ *
+ * Locking Note: The rport lock is expected to be held before
+ * calling this routine
+ */
+static void fc_rport_error(struct fc_rport *rport, struct fc_frame *fp)
+{
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+ unsigned long delay = 0;
+
+ FC_DEBUG_RPORT("Error %ld in state %s, retries %d\n",
+ PTR_ERR(fp), fc_rport_state(rport), rdata->retries);
+
+ if (!fp || PTR_ERR(fp) == -FC_EX_TIMEOUT) {
+ /*
+ * Memory allocation failure, or the exchange timed out.
+ * Retry after delay
+ */
+ if (rdata->retries < rdata->local_port->max_retry_count) {
+ rdata->retries++;
+ if (!fp)
+ delay = msecs_to_jiffies(500);
+ get_device(&rport->dev);
+ schedule_delayed_work(&rdata->retry_work, delay);
+ } else {
+ switch (rdata->rp_state) {
+ case RPORT_ST_PLOGI:
+ case RPORT_ST_PRLI:
+ case RPORT_ST_LOGO:
+ rdata->event = LPORT_EV_RPORT_FAILED;
+ queue_work(rport_event_queue, &rdata->event_work);
+ break;
+ case RPORT_ST_RTV:
+ fc_rport_enter_ready(rport);
+ break;
+ case RPORT_ST_NONE:
+ case RPORT_ST_READY:
+ case RPORT_ST_INIT:
+ BUG();
+ break;
+ }
+ }
+ }
+}
+
+/**
+ * fc_rport_plogi_recv_resp - Handle incoming ELS PLOGI response
+ * @sp: current sequence in the PLOGI exchange
+ * @fp: response frame
+ * @rp_arg: Fibre Channel remote port
+ *
+ * Locking Note: This function will be called without the rport lock
+ * held, but it will lock, call an _enter_* function or fc_rport_error
+ * and then unlock the rport.
+ */
+static void fc_rport_plogi_resp(struct fc_seq *sp, struct fc_frame *fp,
+ void *rp_arg)
+{
+ struct fc_rport *rport = rp_arg;
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+ struct fc_lport *lport = rdata->local_port;
+ struct fc_els_flogi *plp;
+ unsigned int tov;
+ u16 csp_seq;
+ u16 cssp_seq;
+ u8 op;
+
+ mutex_lock(&rdata->rp_mutex);
+
+ FC_DEBUG_RPORT("Received a PLOGI response\n");
+
+ if (rdata->rp_state != RPORT_ST_PLOGI) {
+ FC_DBG("Received a PLOGI response, but in state %s\n",
+ fc_rport_state(rport));
+ goto out;
+ }
+
+ if (IS_ERR(fp)) {
+ fc_rport_error(rport, fp);
+ goto err;
+ }
+
+ op = fc_frame_payload_op(fp);
+ if (op == ELS_LS_ACC &&
+ (plp = fc_frame_payload_get(fp, sizeof(*plp))) != NULL) {
+ rport->port_name = ntohll(get_unaligned(&plp->fl_wwpn));
+ rport->node_name = ntohll(get_unaligned(&plp->fl_wwnn));
+
+ tov = ntohl(plp->fl_csp.sp_e_d_tov);
+ if (ntohs(plp->fl_csp.sp_features) & FC_SP_FT_EDTR)
+ tov /= 1000;
+ if (tov > rdata->e_d_tov)
+ rdata->e_d_tov = tov;
+ csp_seq = ntohs(plp->fl_csp.sp_tot_seq);
+ cssp_seq = ntohs(plp->fl_cssp[3 - 1].cp_con_seq);
+ if (cssp_seq < csp_seq)
+ csp_seq = cssp_seq;
+ rdata->max_seq = csp_seq;
+ rport->maxframe_size =
+ fc_plogi_get_maxframe(plp, lport->mfs);
+
+ /*
+ * If the rport is one of the well known addresses
+ * we skip PRLI and RTV and go straight to READY.
+ */
+ if (rport->port_id >= FC_FID_DOM_MGR)
+ fc_rport_enter_ready(rport);
+ else
+ fc_rport_enter_prli(rport);
+ } else
+ fc_rport_error(rport, fp);
+
+out:
+ fc_frame_free(fp);
+err:
+ mutex_unlock(&rdata->rp_mutex);
+}
+
+/**
+ * fc_rport_enter_plogi - Send Port Login (PLOGI) request to peer
+ * @rport: Fibre Channel remote port to send PLOGI to
+ *
+ * Locking Note: The rport lock is expected to be held before calling
+ * this routine.
+ */
+static void fc_rport_enter_plogi(struct fc_rport *rport)
+{
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+ struct fc_lport *lport = rdata->local_port;
+ struct fc_frame *fp;
+ struct fc_els_flogi *plogi;
+
+ FC_DEBUG_RPORT("Port (%6x) entered PLOGI state from %s state\n",
+ rport->port_id, fc_rport_state(rport));
+
+ fc_rport_state_enter(rport, RPORT_ST_PLOGI);
+
+ rport->maxframe_size = FC_MIN_MAX_PAYLOAD;
+ fp = fc_frame_alloc(lport, sizeof(*plogi));
+ if (!fp) {
+ fc_rport_error(rport, fp);
+ return;
+ }
+
+ plogi = fc_frame_payload_get(fp, sizeof(*plogi));
+ fc_lport_plogi_fill(rdata->local_port, plogi, ELS_PLOGI);
+ rdata->e_d_tov = lport->e_d_tov;
+ fc_frame_setup(fp, FC_RCTL_ELS_REQ, FC_TYPE_ELS);
+
+ if (!lport->tt.exch_seq_send(lport, fp,
+ fc_rport_plogi_resp, NULL,
+ rport, lport->e_d_tov,
+ fc_host_port_id(rdata->local_port->host),
+ rport->port_id,
+ FC_FC_SEQ_INIT | FC_FC_END_SEQ))
+ fc_rport_error(rport, fp);
+}
+
+/**
+ * fc_rport_prli_resp - Process Login (PRLI) response handler
+ * @sp: current sequence in the PRLI exchange
+ * @fp: response frame
+ * @rp_arg: Fibre Channel remote port
+ *
+ * Locking Note: This function will be called without the rport lock
+ * held, but it will lock, call an _enter_* function or fc_rport_error
+ * and then unlock the rport.
+ */
+static void fc_rport_prli_resp(struct fc_seq *sp, struct fc_frame *fp,
+ void *rp_arg)
+{
+ struct fc_rport *rport = rp_arg;
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+ struct {
+ struct fc_els_prli prli;
+ struct fc_els_spp spp;
+ } *pp;
+ u32 roles = FC_RPORT_ROLE_UNKNOWN;
+ u32 fcp_parm = 0;
+ u8 op;
+
+ mutex_lock(&rdata->rp_mutex);
+
+ FC_DEBUG_RPORT("Received a PRLI response\n");
+
+ if (rdata->rp_state != RPORT_ST_PRLI) {
+ FC_DBG("Received a PRLI response, but in state %s\n",
+ fc_rport_state(rport));
+ goto out;
+ }
+
+ if (IS_ERR(fp)) {
+ fc_rport_error(rport, fp);
+ goto err;
+ }
+
+ op = fc_frame_payload_op(fp);
+ if (op == ELS_LS_ACC) {
+ pp = fc_frame_payload_get(fp, sizeof(*pp));
+ if (pp && pp->prli.prli_spp_len >= sizeof(pp->spp)) {
+ fcp_parm = ntohl(pp->spp.spp_params);
+ if (fcp_parm & FCP_SPPF_RETRY)
+ rdata->flags |= FC_RP_FLAGS_RETRY;
+ }
+
+ rport->supported_classes = FC_COS_CLASS3;
+ if (fcp_parm & FCP_SPPF_INIT_FCN)
+ roles |= FC_RPORT_ROLE_FCP_INITIATOR;
+ if (fcp_parm & FCP_SPPF_TARG_FCN)
+ roles |= FC_RPORT_ROLE_FCP_TARGET;
+
+ rport->roles = roles;
+ fc_rport_enter_rtv(rport);
+
+ } else {
+ FC_DBG("Bad ELS response\n");
+ rdata->event = LPORT_EV_RPORT_FAILED;
+ queue_work(rport_event_queue, &rdata->event_work);
+ }
+
+out:
+ fc_frame_free(fp);
+err:
+ mutex_unlock(&rdata->rp_mutex);
+}
+
+/**
+ * fc_rport_logo_resp - Logout (LOGO) response handler
+ * @sp: current sequence in the LOGO exchange
+ * @fp: response frame
+ * @rp_arg: Fibre Channel remote port
+ *
+ * Locking Note: This function will be called without the rport lock
+ * held, but it will lock, call an _enter_* function or fc_rport_error
+ * and then unlock the rport.
+ */
+static void fc_rport_logo_resp(struct fc_seq *sp, struct fc_frame *fp,
+ void *rp_arg)
+{
+ struct fc_rport *rport = rp_arg;
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+ u8 op;
+
+ mutex_lock(&rdata->rp_mutex);
+
+ FC_DEBUG_RPORT("Received a LOGO response\n");
+
+ if (rdata->rp_state != RPORT_ST_LOGO) {
+ FC_DBG("Received a LOGO response, but in state %s\n",
+ fc_rport_state(rport));
+ goto out;
+ }
+
+ if (IS_ERR(fp)) {
+ fc_rport_error(rport, fp);
+ goto err;
+ }
+
+ op = fc_frame_payload_op(fp);
+ if (op == ELS_LS_ACC) {
+ fc_rport_enter_rtv(rport);
+ } else {
+ FC_DBG("Bad ELS response\n");
+ rdata->event = LPORT_EV_RPORT_LOGO;
+ queue_work(rport_event_queue, &rdata->event_work);
+ }
+
+out:
+ fc_frame_free(fp);
+err:
+ mutex_unlock(&rdata->rp_mutex);
+}
+
+/**
+ * fc_rport_enter_prli - Send Process Login (PRLI) request to peer
+ * @rport: Fibre Channel remote port to send PRLI to
+ *
+ * Locking Note: The rport lock is expected to be held before calling
+ * this routine.
+ */
+static void fc_rport_enter_prli(struct fc_rport *rport)
+{
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+ struct fc_lport *lport = rdata->local_port;
+ struct {
+ struct fc_els_prli prli;
+ struct fc_els_spp spp;
+ } *pp;
+ struct fc_frame *fp;
+
+ FC_DEBUG_RPORT("Port (%6x) entered PRLI state from %s state\n",
+ rport->port_id, fc_rport_state(rport));
+
+ fc_rport_state_enter(rport, RPORT_ST_PRLI);
+
+ fp = fc_frame_alloc(lport, sizeof(*pp));
+ if (!fp) {
+ fc_rport_error(rport, fp);
+ return;
+ }
+
+ pp = fc_frame_payload_get(fp, sizeof(*pp));
+ memset(pp, 0, sizeof(*pp));
+ pp->prli.prli_cmd = ELS_PRLI;
+ pp->prli.prli_spp_len = sizeof(struct fc_els_spp);
+ pp->prli.prli_len = htons(sizeof(*pp));
+ pp->spp.spp_type = FC_TYPE_FCP;
+ pp->spp.spp_flags = FC_SPP_EST_IMG_PAIR;
+ pp->spp.spp_params = htonl(lport->service_params);
+ fc_frame_setup(fp, FC_RCTL_ELS_REQ, FC_TYPE_ELS);
+
+ if (!lport->tt.exch_seq_send(lport, fp,
+ fc_rport_prli_resp, NULL,
+ rport, lport->e_d_tov,
+ fc_host_port_id(lport->host),
+ rport->port_id,
+ FC_FC_SEQ_INIT | FC_FC_END_SEQ))
+ fc_rport_error(rport, fp);
+}
+
+/**
+ * fc_rport_els_rtv_resp - Request Timeout Value response handler
+ * @sp: current sequence in the RTV exchange
+ * @fp: response frame
+ * @rp_arg: Fibre Channel remote port
+ *
+ * Many targets don't seem to support this.
+ *
+ * Locking Note: This function will be called without the rport lock
+ * held, but it will lock, call an _enter_* function or fc_rport_error
+ * and then unlock the rport.
+ */
+static void fc_rport_rtv_resp(struct fc_seq *sp, struct fc_frame *fp,
+ void *rp_arg)
+{
+ struct fc_rport *rport = rp_arg;
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+ u8 op;
+
+ mutex_lock(&rdata->rp_mutex);
+
+ FC_DEBUG_RPORT("Received a RTV response\n");
+
+ if (rdata->rp_state != RPORT_ST_RTV) {
+ FC_DBG("Received a RTV response, but in state %s\n",
+ fc_rport_state(rport));
+ goto out;
+ }
+
+ if (IS_ERR(fp)) {
+ fc_rport_error(rport, fp);
+ goto err;
+ }
+
+ op = fc_frame_payload_op(fp);
+ if (op == ELS_LS_ACC) {
+ struct fc_els_rtv_acc *rtv;
+ u32 toq;
+ u32 tov;
+
+ rtv = fc_frame_payload_get(fp, sizeof(*rtv));
+ if (rtv) {
+ toq = ntohl(rtv->rtv_toq);
+ tov = ntohl(rtv->rtv_r_a_tov);
+ if (tov == 0)
+ tov = 1;
+ rdata->r_a_tov = tov;
+ tov = ntohl(rtv->rtv_e_d_tov);
+ if (toq & FC_ELS_RTV_EDRES)
+ tov /= 1000000;
+ if (tov == 0)
+ tov = 1;
+ rdata->e_d_tov = tov;
+ }
+ }
+
+ fc_rport_enter_ready(rport);
+
+out:
+ fc_frame_free(fp);
+err:
+ mutex_unlock(&rdata->rp_mutex);
+}
+
+/**
+ * fc_rport_enter_rtv - Send Request Timeout Value (RTV) request to peer
+ * @rport: Fibre Channel remote port to send RTV to
+ *
+ * Locking Note: The rport lock is expected to be held before calling
+ * this routine.
+ */
+static void fc_rport_enter_rtv(struct fc_rport *rport)
+{
+ struct fc_els_rtv *rtv;
+ struct fc_frame *fp;
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+ struct fc_lport *lport = rdata->local_port;
+
+ FC_DEBUG_RPORT("Port (%6x) entered RTV state from %s state\n",
+ rport->port_id, fc_rport_state(rport));
+
+ fc_rport_state_enter(rport, RPORT_ST_RTV);
+
+ fp = fc_frame_alloc(lport, sizeof(*rtv));
+ if (!fp) {
+ fc_rport_error(rport, fp);
+ return;
+ }
+
+ rtv = fc_frame_payload_get(fp, sizeof(*rtv));
+ memset(rtv, 0, sizeof(*rtv));
+ rtv->rtv_cmd = ELS_RTV;
+ fc_frame_setup(fp, FC_RCTL_ELS_REQ, FC_TYPE_ELS);
+
+ if (!lport->tt.exch_seq_send(lport, fp,
+ fc_rport_rtv_resp, NULL,
+ rport, lport->e_d_tov,
+ fc_host_port_id(lport->host),
+ rport->port_id,
+ FC_FC_SEQ_INIT | FC_FC_END_SEQ))
+ fc_rport_error(rport, fp);
+}
+
+/**
+ * fc_rport_enter_logo - Send Logout (LOGO) request to peer
+ * @rport: Fibre Channel remote port to send LOGO to
+ *
+ * Locking Note: The rport lock is expected to be held before calling
+ * this routine.
+ */
+static void fc_rport_enter_logo(struct fc_rport *rport)
+{
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+ struct fc_lport *lport = rdata->local_port;
+ struct fc_frame *fp;
+ struct fc_els_logo *logo;
+
+ FC_DEBUG_RPORT("Port (%6x) entered LOGO state from %s state\n",
+ rport->port_id, fc_rport_state(rport));
+
+ fc_rport_state_enter(rport, RPORT_ST_LOGO);
+
+ fp = fc_frame_alloc(lport, sizeof(*logo));
+ if (!fp) {
+ fc_rport_error(rport, fp);
+ return;
+ }
+
+ logo = fc_frame_payload_get(fp, sizeof(*logo));
+ memset(logo, 0, sizeof(*logo));
+ logo->fl_cmd = ELS_LOGO;
+ hton24(logo->fl_n_port_id, fc_host_port_id(lport->host));
+ logo->fl_n_port_wwn = htonll(lport->wwpn);
+ fc_frame_setup(fp, FC_RCTL_ELS_REQ, FC_TYPE_ELS);
+
+ if (!lport->tt.exch_seq_send(lport, fp,
+ fc_rport_logo_resp, NULL,
+ rport, lport->e_d_tov,
+ fc_host_port_id(lport->host),
+ rport->port_id,
+ FC_FC_SEQ_INIT | FC_FC_END_SEQ))
+ fc_rport_error(rport, fp);
+}
+
+
+/**
+ * fc_rport_recv_req - Receive a request from a rport
+ * @sp: current sequence in the PLOGI exchange
+ * @fp: response frame
+ * @rp_arg: Fibre Channel remote port
+ *
+ * Locking Note: Called without the rport lock held. This
+ * function will hold the rport lock, call an _enter_*
+ * function and then unlock the rport.
+ */
+void fc_rport_recv_req(struct fc_seq *sp, struct fc_frame *fp,
+ struct fc_rport *rport)
+{
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+ struct fc_lport *lport = rdata->local_port;
+
+ struct fc_frame_header *fh;
+ struct fc_seq_els_data els_data;
+ u8 op;
+
+ mutex_lock(&rdata->rp_mutex);
+
+ els_data.fp = NULL;
+ els_data.explan = ELS_EXPL_NONE;
+ els_data.reason = ELS_RJT_NONE;
+
+ fh = fc_frame_header_get(fp);
+
+ if (fh->fh_r_ctl == FC_RCTL_ELS_REQ && fh->fh_type == FC_TYPE_ELS) {
+ op = fc_frame_payload_op(fp);
+ switch (op) {
+ case ELS_PLOGI:
+ fc_rport_recv_plogi_req(rport, sp, fp);
+ break;
+ case ELS_PRLI:
+ fc_rport_recv_prli_req(rport, sp, fp);
+ break;
+ case ELS_PRLO:
+ fc_rport_recv_prlo_req(rport, sp, fp);
+ break;
+ case ELS_LOGO:
+ fc_rport_recv_logo_req(rport, sp, fp);
+ break;
+ case ELS_RRQ:
+ els_data.fp = fp;
+ lport->tt.seq_els_rsp_send(sp, ELS_RRQ, &els_data);
+ break;
+ case ELS_REC:
+ els_data.fp = fp;
+ lport->tt.seq_els_rsp_send(sp, ELS_REC, &els_data);
+ break;
+ default:
+ els_data.reason = ELS_RJT_UNSUP;
+ lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &els_data);
+ break;
+ }
+ }
+
+ mutex_unlock(&rdata->rp_mutex);
+ fc_frame_free(fp);
+}
+
+/**
+ * fc_rport_recv_plogi_req - Handle incoming Port Login (PLOGI) request
+ * @rport: Fibre Channel remote port that initiated PLOGI
+ * @sp: current sequence in the PLOGI exchange
+ * @fp: PLOGI request frame
+ *
+ * Locking Note: The rport lock is exected to be held before calling
+ * this function.
+ */
+static void fc_rport_recv_plogi_req(struct fc_rport *rport,
+ struct fc_seq *sp, struct fc_frame *rx_fp)
+{
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+ struct fc_lport *lport = rdata->local_port;
+ struct fc_frame *fp = rx_fp;
+
+ struct fc_frame_header *fh;
+ struct fc_els_flogi *pl;
+ struct fc_seq_els_data rjt_data;
+ u32 sid;
+ u64 wwpn;
+ u64 wwnn;
+ enum fc_els_rjt_reason reject = 0;
+ u32 f_ctl;
+ rjt_data.fp = NULL;
+
+ fh = fc_frame_header_get(fp);
+
+ FC_DEBUG_RPORT("Received PLOGI request from port (%6x) "
+ "while in state %s\n", ntoh24(fh->fh_s_id),
+ fc_rport_state(rport));
+
+ sid = ntoh24(fh->fh_s_id);
+ pl = fc_frame_payload_get(fp, sizeof(*pl));
+ if (!pl) {
+ FC_DBG("incoming PLOGI from %x too short\n", sid);
+ WARN_ON(1);
+ /* XXX TBD: send reject? */
+ fc_frame_free(fp);
+ return;
+ }
+ wwpn = ntohll(get_unaligned(&pl->fl_wwpn));
+ wwnn = ntohll(get_unaligned(&pl->fl_wwnn));
+
+ /*
+ * If the session was just created, possibly due to the incoming PLOGI,
+ * set the state appropriately and accept the PLOGI.
+ *
+ * If we had also sent a PLOGI, and if the received PLOGI is from a
+ * higher WWPN, we accept it, otherwise an LS_RJT is sent with reason
+ * "command already in progress".
+ *
+ * XXX TBD: If the session was ready before, the PLOGI should result in
+ * all outstanding exchanges being reset.
+ */
+ switch (rdata->rp_state) {
+ case RPORT_ST_INIT:
+ FC_DEBUG_RPORT("incoming PLOGI from %6x wwpn %llx state INIT "
+ "- reject\n", sid, wwpn);
+ reject = ELS_RJT_UNSUP;
+ break;
+ case RPORT_ST_PLOGI:
+ FC_DEBUG_RPORT("incoming PLOGI from %x in PLOGI state %d\n",
+ sid, rdata->rp_state);
+ if (wwpn < lport->wwpn)
+ reject = ELS_RJT_INPROG;
+ break;
+ case RPORT_ST_PRLI:
+ case RPORT_ST_READY:
+ FC_DEBUG_RPORT("incoming PLOGI from %x in logged-in state %d "
+ "- ignored for now\n", sid, rdata->rp_state);
+ /* XXX TBD - should reset */
+ break;
+ case RPORT_ST_NONE:
+ default:
+ FC_DEBUG_RPORT("incoming PLOGI from %x in unexpected "
+ "state %d\n", sid, rdata->rp_state);
+ break;
+ }
+
+ if (reject) {
+ rjt_data.reason = reject;
+ rjt_data.explan = ELS_EXPL_NONE;
+ lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data);
+ fc_frame_free(fp);
+ } else {
+ fp = fc_frame_alloc(lport, sizeof(*pl));
+ if (fp == NULL) {
+ fp = rx_fp;
+ rjt_data.reason = ELS_RJT_UNAB;
+ rjt_data.explan = ELS_EXPL_NONE;
+ lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data);
+ fc_frame_free(fp);
+ } else {
+ sp = lport->tt.seq_start_next(sp);
+ WARN_ON(!sp);
+ fc_rport_set_name(rport, wwpn, wwnn);
+
+ /*
+ * Get session payload size from incoming PLOGI.
+ */
+ rport->maxframe_size =
+ fc_plogi_get_maxframe(pl, lport->mfs);
+ fc_frame_free(rx_fp);
+ pl = fc_frame_payload_get(fp, sizeof(*pl));
+ WARN_ON(!pl);
+ fc_lport_plogi_fill(lport, pl, ELS_LS_ACC);
+
+ /*
+ * Send LS_ACC. If this fails,
+ * the originator should retry.
+ */
+ f_ctl = FC_FC_SEQ_INIT | FC_FC_LAST_SEQ | FC_FC_END_SEQ;
+ fc_frame_setup(fp, FC_RCTL_ELS_REP, FC_TYPE_ELS);
+ lport->tt.seq_send(lport, sp, fp, f_ctl);
+ if (rdata->rp_state == RPORT_ST_PLOGI)
+ fc_rport_enter_prli(rport);
+ }
+ }
+}
+
+/**
+ * fc_rport_recv_prli_req - Handle incoming Process Login (PRLI) request
+ * @rport: Fibre Channel remote port that initiated PRLI
+ * @sp: current sequence in the PRLI exchange
+ * @fp: PRLI request frame
+ *
+ * Locking Note: The rport lock is exected to be held before calling
+ * this function.
+ */
+static void fc_rport_recv_prli_req(struct fc_rport *rport,
+ struct fc_seq *sp, struct fc_frame *rx_fp)
+{
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+ struct fc_lport *lport = rdata->local_port;
+
+ struct fc_frame *fp;
+ struct fc_frame_header *fh;
+ struct {
+ struct fc_els_prli prli;
+ struct fc_els_spp spp;
+ } *pp;
+ struct fc_els_spp *rspp; /* request service param page */
+ struct fc_els_spp *spp; /* response spp */
+ unsigned int len;
+ unsigned int plen;
+ enum fc_els_rjt_reason reason = ELS_RJT_UNAB;
+ enum fc_els_rjt_explan explan = ELS_EXPL_NONE;
+ enum fc_els_spp_resp resp;
+ struct fc_seq_els_data rjt_data;
+ u32 f_ctl;
+ u32 fcp_parm;
+ u32 roles = FC_RPORT_ROLE_UNKNOWN;
+ rjt_data.fp = NULL;
+
+ fh = fc_frame_header_get(rx_fp);
+
+ FC_DEBUG_RPORT("Received PRLI request from port (%6x) "
+ "while in state %s\n", ntoh24(fh->fh_s_id),
+ fc_rport_state(rport));
+
+ switch (rdata->rp_state) {
+ case RPORT_ST_PRLI:
+ case RPORT_ST_READY:
+ reason = ELS_RJT_NONE;
+ break;
+ default:
+ break;
+ }
+ len = fr_len(rx_fp) - sizeof(*fh);
+ pp = fc_frame_payload_get(rx_fp, sizeof(*pp));
+ if (pp == NULL) {
+ reason = ELS_RJT_PROT;
+ explan = ELS_EXPL_INV_LEN;
+ } else {
+ plen = ntohs(pp->prli.prli_len);
+ if ((plen % 4) != 0 || plen > len) {
+ reason = ELS_RJT_PROT;
+ explan = ELS_EXPL_INV_LEN;
+ } else if (plen < len) {
+ len = plen;
+ }
+ plen = pp->prli.prli_spp_len;
+ if ((plen % 4) != 0 || plen < sizeof(*spp) ||
+ plen > len || len < sizeof(*pp)) {
+ reason = ELS_RJT_PROT;
+ explan = ELS_EXPL_INV_LEN;
+ }
+ rspp = &pp->spp;
+ }
+ if (reason != ELS_RJT_NONE ||
+ (fp = fc_frame_alloc(lport, len)) == NULL) {
+ rjt_data.reason = reason;
+ rjt_data.explan = explan;
+ lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data);
+ } else {
+ sp = lport->tt.seq_start_next(sp);
+ WARN_ON(!sp);
+ pp = fc_frame_payload_get(fp, len);
+ WARN_ON(!pp);
+ memset(pp, 0, len);
+ pp->prli.prli_cmd = ELS_LS_ACC;
+ pp->prli.prli_spp_len = plen;
+ pp->prli.prli_len = htons(len);
+ len -= sizeof(struct fc_els_prli);
+
+ /*
+ * Go through all the service parameter pages and build
+ * response. If plen indicates longer SPP than standard,
+ * use that. The entire response has been pre-cleared above.
+ */
+ spp = &pp->spp;
+ while (len >= plen) {
+ spp->spp_type = rspp->spp_type;
+ spp->spp_type_ext = rspp->spp_type_ext;
+ spp->spp_flags = rspp->spp_flags & FC_SPP_EST_IMG_PAIR;
+ resp = FC_SPP_RESP_ACK;
+ if (rspp->spp_flags & FC_SPP_RPA_VAL)
+ resp = FC_SPP_RESP_NO_PA;
+ switch (rspp->spp_type) {
+ case 0: /* common to all FC-4 types */
+ break;
+ case FC_TYPE_FCP:
+ fcp_parm = ntohl(rspp->spp_params);
+ if (fcp_parm * FCP_SPPF_RETRY)
+ rdata->flags |= FC_RP_FLAGS_RETRY;
+ rport->supported_classes = FC_COS_CLASS3;
+ if (fcp_parm & FCP_SPPF_INIT_FCN)
+ roles |= FC_RPORT_ROLE_FCP_INITIATOR;
+ if (fcp_parm & FCP_SPPF_TARG_FCN)
+ roles |= FC_RPORT_ROLE_FCP_TARGET;
+ rport->roles = roles;
+
+ spp->spp_params =
+ htonl(lport->service_params);
+ break;
+ default:
+ resp = FC_SPP_RESP_INVL;
+ break;
+ }
+ spp->spp_flags |= resp;
+ len -= plen;
+ rspp = (struct fc_els_spp *)((char *)rspp + plen);
+ spp = (struct fc_els_spp *)((char *)spp + plen);
+ }
+
+ /*
+ * Send LS_ACC. If this fails, the originator should retry.
+ */
+ f_ctl = FC_FC_SEQ_INIT | FC_FC_LAST_SEQ | FC_FC_END_SEQ;
+ fc_frame_setup(fp, FC_RCTL_ELS_REP, FC_TYPE_ELS);
+ lport->tt.seq_send(lport, sp, fp, f_ctl);
+
+ /*
+ * Get lock and re-check state.
+ */
+ switch (rdata->rp_state) {
+ case RPORT_ST_PRLI:
+ fc_rport_enter_ready(rport);
+ break;
+ case RPORT_ST_READY:
+ break;
+ default:
+ break;
+ }
+ }
+ fc_frame_free(rx_fp);
+}
+
+/**
+ * fc_rport_recv_prlo_req - Handle incoming Process Logout (PRLO) request
+ * @rport: Fibre Channel remote port that initiated PRLO
+ * @sp: current sequence in the PRLO exchange
+ * @fp: PRLO request frame
+ *
+ * Locking Note: The rport lock is exected to be held before calling
+ * this function.
+ */
+static void fc_rport_recv_prlo_req(struct fc_rport *rport, struct fc_seq *sp,
+ struct fc_frame *fp)
+{
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+ struct fc_lport *lport = rdata->local_port;
+
+ struct fc_frame_header *fh;
+ struct fc_seq_els_data rjt_data;
+
+ fh = fc_frame_header_get(fp);
+
+ FC_DEBUG_RPORT("Received PRLO request from port (%6x) "
+ "while in state %s\n", ntoh24(fh->fh_s_id),
+ fc_rport_state(rport));
+
+ rjt_data.fp = NULL;
+ rjt_data.reason = ELS_RJT_UNAB;
+ rjt_data.explan = ELS_EXPL_NONE;
+ lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data);
+ fc_frame_free(fp);
+}
+
+/**
+ * fc_rport_recv_logo_req - Handle incoming Logout (LOGO) request
+ * @rport: Fibre Channel remote port that initiated LOGO
+ * @sp: current sequence in the LOGO exchange
+ * @fp: LOGO request frame
+ *
+ * Locking Note: The rport lock is exected to be held before calling
+ * this function.
+ */
+static void fc_rport_recv_logo_req(struct fc_rport *rport, struct fc_seq *sp,
+ struct fc_frame *fp)
+{
+ struct fc_frame_header *fh;
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+ struct fc_lport *lport = rdata->local_port;
+
+ fh = fc_frame_header_get(fp);
+
+ FC_DEBUG_RPORT("Received LOGO request from port (%6x) "
+ "while in state %s\n", ntoh24(fh->fh_s_id),
+ fc_rport_state(rport));
+
+ rdata->event = LPORT_EV_RPORT_LOGO;
+ queue_work(rport_event_queue, &rdata->event_work);
+
+ lport->tt.seq_els_rsp_send(sp, ELS_LS_ACC, NULL);
+ fc_frame_free(fp);
+}
+
+int fc_rport_init(struct fc_lport *lport)
+{
+ if (!lport->tt.rport_login)
+ lport->tt.rport_login = fc_rport_login;
+
+ if (!lport->tt.rport_logout)
+ lport->tt.rport_logout = fc_rport_logout;
+
+ if (!lport->tt.rport_stop)
+ lport->tt.rport_stop = fc_rport_stop;
+
+ if (!lport->tt.rport_recv_req)
+ lport->tt.rport_recv_req = fc_rport_recv_req;
+
+ return 0;
+}
+EXPORT_SYMBOL(fc_rport_init);
+
+int fc_setup_rport()
+{
+ rport_event_queue = create_singlethread_workqueue("fc_rport_eq");
+ if (!rport_event_queue)
+ return -ENOMEM;
+ return 0;
+}
+EXPORT_SYMBOL(fc_setup_rport);
+
+void fc_destroy_rport()
+{
+ destroy_workqueue(rport_event_queue);
+}
+EXPORT_SYMBOL(fc_destroy_rport);
+
+void fc_rport_terminate_io(struct fc_rport *rport)
+{
+ struct fc_rport_libfc_priv *rdata = rport->dd_data;
+ struct fc_lport *lport = rdata->local_port;
+
+ lport->tt.exch_mgr_reset(lport->emp, 0, rport->port_id);
+ lport->tt.exch_mgr_reset(lport->emp, rport->port_id, 0);
+}
+EXPORT_SYMBOL(fc_rport_terminate_io);
diff --git a/include/scsi/fc/fc_els.h b/include/scsi/fc/fc_els.h
new file mode 100644
index 0000000..af4bf0c
--- /dev/null
+++ b/include/scsi/fc/fc_els.h
@@ -0,0 +1,802 @@
+/*
+ * Copyright(c) 2007 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Maintained at www.Open-FCoE.org
+ */
+
+#ifndef _FC_ELS_H_
+#define _FC_ELS_H_
+
+/*
+ * Fibre Channel Switch - Enhanced Link Services definitions.
+ * From T11 FC-LS Rev 1.2 June 7, 2005.
+ */
+
+/*
+ * ELS Command codes - byte 0 of the frame payload
+ */
+enum fc_els_cmd {
+ ELS_LS_RJT = 0x01, /* ESL reject */
+ ELS_LS_ACC = 0x02, /* ESL Accept */
+ ELS_PLOGI = 0x03, /* N_Port login */
+ ELS_FLOGI = 0x04, /* F_Port login */
+ ELS_LOGO = 0x05, /* Logout */
+ ELS_ABTX = 0x06, /* Abort exchange - obsolete */
+ ELS_RCS = 0x07, /* read connection status */
+ ELS_RES = 0x08, /* read exchange status block */
+ ELS_RSS = 0x09, /* read sequence status block */
+ ELS_RSI = 0x0a, /* read sequence initiative */
+ ELS_ESTS = 0x0b, /* establish streaming */
+ ELS_ESTC = 0x0c, /* estimate credit */
+ ELS_ADVC = 0x0d, /* advise credit */
+ ELS_RTV = 0x0e, /* read timeout value */
+ ELS_RLS = 0x0f, /* read link error status block */
+ ELS_ECHO = 0x10, /* echo */
+ ELS_TEST = 0x11, /* test */
+ ELS_RRQ = 0x12, /* reinstate recovery qualifier */
+ ELS_REC = 0x13, /* read exchange concise */
+ ELS_SRR = 0x14, /* sequence retransmission request */
+ ELS_PRLI = 0x20, /* process login */
+ ELS_PRLO = 0x21, /* process logout */
+ ELS_SCN = 0x22, /* state change notification */
+ ELS_TPLS = 0x23, /* test process login state */
+ ELS_TPRLO = 0x24, /* third party process logout */
+ ELS_LCLM = 0x25, /* login control list mgmt (obs) */
+ ELS_GAID = 0x30, /* get alias_ID */
+ ELS_FACT = 0x31, /* fabric activate alias_id */
+ ELS_FDACDT = 0x32, /* fabric deactivate alias_id */
+ ELS_NACT = 0x33, /* N-port activate alias_id */
+ ELS_NDACT = 0x34, /* N-port deactivate alias_id */
+ ELS_QOSR = 0x40, /* quality of service request */
+ ELS_RVCS = 0x41, /* read virtual circuit status */
+ ELS_PDISC = 0x50, /* discover N_port service params */
+ ELS_FDISC = 0x51, /* discover F_port service params */
+ ELS_ADISC = 0x52, /* discover address */
+ ELS_RNC = 0x53, /* report node cap (obs) */
+ ELS_FARP_REQ = 0x54, /* FC ARP request */
+ ELS_FARP_REPL = 0x55, /* FC ARP reply */
+ ELS_RPS = 0x56, /* read port status block */
+ ELS_RPL = 0x57, /* read port list */
+ ELS_RPBC = 0x58, /* read port buffer condition */
+ ELS_FAN = 0x60, /* fabric address notification */
+ ELS_RSCN = 0x61, /* registered state change notification */
+ ELS_SCR = 0x62, /* state change registration */
+ ELS_RNFT = 0x63, /* report node FC-4 types */
+ ELS_CSR = 0x68, /* clock synch. request */
+ ELS_CSU = 0x69, /* clock synch. update */
+ ELS_LINIT = 0x70, /* loop initialize */
+ ELS_LSTS = 0x72, /* loop status */
+ ELS_RNID = 0x78, /* request node ID data */
+ ELS_RLIR = 0x79, /* registered link incident report */
+ ELS_LIRR = 0x7a, /* link incident record registration */
+ ELS_SRL = 0x7b, /* scan remote loop */
+ ELS_SBRP = 0x7c, /* set bit-error reporting params */
+ ELS_RPSC = 0x7d, /* report speed capabilities */
+ ELS_QSA = 0x7e, /* query security attributes */
+ ELS_EVFP = 0x7f, /* exchange virt. fabrics params */
+ ELS_LKA = 0x80, /* link keep-alive */
+ ELS_AUTH_ELS = 0x90, /* authentication ELS */
+};
+
+/*
+ * Initializer useful for decoding table.
+ * Please keep this in sync with the above definitions.
+ */
+#define FC_ELS_CMDS_INIT { \
+ [ELS_LS_RJT] = "LS_RJT", \
+ [ELS_LS_ACC] = "LS_ACC", \
+ [ELS_PLOGI] = "PLOGI", \
+ [ELS_FLOGI] = "FLOGI", \
+ [ELS_LOGO] = "LOGO", \
+ [ELS_ABTX] = "ABTX", \
+ [ELS_RCS] = "RCS", \
+ [ELS_RES] = "RES", \
+ [ELS_RSS] = "RSS", \
+ [ELS_RSI] = "RSI", \
+ [ELS_ESTS] = "ESTS", \
+ [ELS_ESTC] = "ESTC", \
+ [ELS_ADVC] = "ADVC", \
+ [ELS_RTV] = "RTV", \
+ [ELS_RLS] = "RLS", \
+ [ELS_ECHO] = "ECHO", \
+ [ELS_TEST] = "TEST", \
+ [ELS_RRQ] = "RRQ", \
+ [ELS_REC] = "REC", \
+ [ELS_SRR] = "SRR", \
+ [ELS_PRLI] = "PRLI", \
+ [ELS_PRLO] = "PRLO", \
+ [ELS_SCN] = "SCN", \
+ [ELS_TPLS] = "TPLS", \
+ [ELS_TPRLO] = "TPRLO", \
+ [ELS_LCLM] = "LCLM", \
+ [ELS_GAID] = "GAID", \
+ [ELS_FACT] = "FACT", \
+ [ELS_FDACDT] = "FDACDT", \
+ [ELS_NACT] = "NACT", \
+ [ELS_NDACT] = "NDACT", \
+ [ELS_QOSR] = "QOSR", \
+ [ELS_RVCS] = "RVCS", \
+ [ELS_PDISC] = "PDISC", \
+ [ELS_FDISC] = "FDISC", \
+ [ELS_ADISC] = "ADISC", \
+ [ELS_RNC] = "RNC", \
+ [ELS_FARP_REQ] = "FARP_REQ", \
+ [ELS_FARP_REPL] = "FARP_REPL", \
+ [ELS_RPS] = "RPS", \
+ [ELS_RPL] = "RPL", \
+ [ELS_RPBC] = "RPBC", \
+ [ELS_FAN] = "FAN", \
+ [ELS_RSCN] = "RSCN", \
+ [ELS_SCR] = "SCR", \
+ [ELS_RNFT] = "RNFT", \
+ [ELS_CSR] = "CSR", \
+ [ELS_CSU] = "CSU", \
+ [ELS_LINIT] = "LINIT", \
+ [ELS_LSTS] = "LSTS", \
+ [ELS_RNID] = "RNID", \
+ [ELS_RLIR] = "RLIR", \
+ [ELS_LIRR] = "LIRR", \
+ [ELS_SRL] = "SRL", \
+ [ELS_SBRP] = "SBRP", \
+ [ELS_RPSC] = "RPSC", \
+ [ELS_QSA] = "QSA", \
+ [ELS_EVFP] = "EVFP", \
+ [ELS_LKA] = "LKA", \
+ [ELS_AUTH_ELS] = "AUTH_ELS", \
+}
+
+/*
+ * LS_ACC payload.
+ */
+struct fc_els_ls_acc {
+ __u8 la_cmd; /* command code ELS_LS_ACC */
+ __u8 la_resv[3]; /* reserved */
+};
+
+/*
+ * ELS reject payload.
+ */
+struct fc_els_ls_rjt {
+ __u8 er_cmd; /* command code ELS_LS_RJT */
+ __u8 er_resv[4]; /* reserved must be zero */
+ __u8 er_reason; /* reason (enum fc_els_rjt_reason below) */
+ __u8 er_explan; /* explanation (enum fc_els_rjt_explan below) */
+ __u8 er_vendor; /* vendor specific code */
+};
+
+/*
+ * ELS reject reason codes (er_reason).
+ */
+enum fc_els_rjt_reason {
+ ELS_RJT_NONE = 0, /* no reject - not to be sent */
+ ELS_RJT_INVAL = 0x01, /* invalid ELS command code */
+ ELS_RJT_LOGIC = 0x03, /* logical error */
+ ELS_RJT_BUSY = 0x05, /* logical busy */
+ ELS_RJT_PROT = 0x07, /* protocol error */
+ ELS_RJT_UNAB = 0x09, /* unable to perform command request */
+ ELS_RJT_UNSUP = 0x0b, /* command not supported */
+ ELS_RJT_INPROG = 0x0e, /* command already in progress */
+ ELS_RJT_VENDOR = 0xff, /* vendor specific error */
+};
+
+
+/*
+ * reason code explanation (er_explan).
+ */
+enum fc_els_rjt_explan {
+ ELS_EXPL_NONE = 0x00, /* No additional explanation */
+ ELS_EXPL_SPP_OPT_ERR = 0x01, /* service parameter error - options */
+ ELS_EXPL_SPP_ICTL_ERR = 0x03, /* service parm error - initiator ctl */
+ ELS_EXPL_AH = 0x11, /* invalid association header */
+ ELS_EXPL_AH_REQ = 0x13, /* association_header required */
+ ELS_EXPL_SID = 0x15, /* invalid originator S_ID */
+ ELS_EXPL_OXID_RXID = 0x17, /* invalid OX_ID-RX_ID combination */
+ ELS_EXPL_INPROG = 0x19, /* Request already in progress */
+ ELS_EXPL_PLOGI_REQD = 0x1e, /* N_Port login required */
+ ELS_EXPL_INSUF_RES = 0x29, /* insufficient resources */
+ ELS_EXPL_UNAB_DATA = 0x2a, /* unable to supply requested data */
+ ELS_EXPL_UNSUPR = 0x2c, /* Request not supported */
+ ELS_EXPL_INV_LEN = 0x2d, /* Invalid payload length */
+ /* TBD - above definitions incomplete */
+};
+
+/*
+ * Common service parameters (N ports).
+ */
+struct fc_els_csp {
+ __u8 sp_hi_ver; /* highest version supported (obs.) */
+ __u8 sp_lo_ver; /* highest version supported (obs.) */
+ __be16 sp_bb_cred; /* buffer-to-buffer credits */
+ __be16 sp_features; /* common feature flags */
+ __be16 sp_bb_data; /* b-b state number and data field sz */
+ union {
+ struct {
+ __be16 _sp_tot_seq; /* total concurrent sequences */
+ __be16 _sp_rel_off; /* rel. offset by info cat */
+ } sp_plogi;
+ struct {
+ __be32 _sp_r_a_tov; /* resource alloc. timeout msec */
+ } sp_flogi_acc;
+ } sp_u;
+ __be32 sp_e_d_tov; /* error detect timeout value */
+};
+#define sp_tot_seq sp_u.sp_plogi._sp_tot_seq
+#define sp_rel_off sp_u.sp_plogi._sp_rel_off
+#define sp_r_a_tov sp_u.sp_flogi_acc._sp_r_a_tov
+
+#define FC_SP_BB_DATA_MASK 0xfff /* mask for data field size in sp_bb_data */
+
+/*
+ * Minimum and maximum values for max data field size in service parameters.
+ */
+#define FC_SP_MIN_MAX_PAYLOAD FC_MIN_MAX_PAYLOAD
+#define FC_SP_MAX_MAX_PAYLOAD FC_MAX_PAYLOAD
+
+/*
+ * sp_features
+ */
+#define FC_SP_FT_CIRO 0x8000 /* continuously increasing rel. off. */
+#define FC_SP_FT_CLAD 0x8000 /* clean address (in FLOGI LS_ACC) */
+#define FC_SP_FT_RAND 0x4000 /* random relative offset */
+#define FC_SP_FT_VAL 0x2000 /* valid vendor version level */
+#define FC_SP_FT_FPORT 0x1000 /* F port (1) vs. N port (0) */
+#define FC_SP_FT_ABB 0x0800 /* alternate BB_credit management */
+#define FC_SP_FT_EDTR 0x0400 /* E_D_TOV Resolution is nanoseconds */
+#define FC_SP_FT_MCAST 0x0200 /* multicast */
+#define FC_SP_FT_BCAST 0x0100 /* broadcast */
+#define FC_SP_FT_HUNT 0x0080 /* hunt group */
+#define FC_SP_FT_SIMP 0x0040 /* dedicated simplex */
+#define FC_SP_FT_SEC 0x0020 /* reserved for security */
+#define FC_SP_FT_CSYN 0x0010 /* clock synch. supported */
+#define FC_SP_FT_RTTOV 0x0008 /* R_T_TOV value 100 uS, else 100 mS */
+#define FC_SP_FT_HALF 0x0004 /* dynamic half duplex */
+#define FC_SP_FT_SEQC 0x0002 /* SEQ_CNT */
+#define FC_SP_FT_PAYL 0x0001 /* FLOGI payload length 256, else 116 */
+
+/*
+ * Class-specific service parameters.
+ */
+struct fc_els_cssp {
+ __be16 cp_class; /* class flags */
+ __be16 cp_init; /* initiator flags */
+ __be16 cp_recip; /* recipient flags */
+ __be16 cp_rdfs; /* receive data field size */
+ __be16 cp_con_seq; /* concurrent sequences */
+ __be16 cp_ee_cred; /* N-port end-to-end credit */
+ __u8 cp_resv1; /* reserved */
+ __u8 cp_open_seq; /* open sequences per exchange */
+ __u8 _cp_resv2[2]; /* reserved */
+};
+
+/*
+ * cp_class flags.
+ */
+#define FC_CPC_VALID 0x8000 /* class valid */
+#define FC_CPC_IMIX 0x4000 /* intermix mode */
+#define FC_CPC_SEQ 0x0800 /* sequential delivery */
+#define FC_CPC_CAMP 0x0200 /* camp-on */
+#define FC_CPC_PRI 0x0080 /* priority */
+
+/*
+ * cp_init flags.
+ * (TBD: not all flags defined here).
+ */
+#define FC_CPI_CSYN 0x0010 /* clock synch. capable */
+
+/*
+ * cp_recip flags.
+ */
+#define FC_CPR_CSYN 0x0008 /* clock synch. capable */
+
+/*
+ * NFC_ELS_FLOGI: Fabric login request.
+ * NFC_ELS_PLOGI: Port login request (same format).
+ */
+struct fc_els_flogi {
+ __u8 fl_cmd; /* command */
+ __u8 _fl_resvd[3]; /* must be zero */
+ struct fc_els_csp fl_csp; /* common service parameters */
+ __be64 fl_wwpn; /* port name */
+ __be64 fl_wwnn; /* node name */
+ struct fc_els_cssp fl_cssp[4]; /* class 1-4 service parameters */
+ __u8 fl_vend[16]; /* vendor version level */
+} __attribute__((__packed__));
+
+/*
+ * Process login service parameter page.
+ */
+struct fc_els_spp {
+ __u8 spp_type; /* type code or common service params */
+ __u8 spp_type_ext; /* type code extension */
+ __u8 spp_flags;
+ __u8 _spp_resvd;
+ __be32 spp_orig_pa; /* originator process associator */
+ __be32 spp_resp_pa; /* responder process associator */
+ __be32 spp_params; /* service parameters */
+};
+
+/*
+ * spp_flags.
+ */
+#define FC_SPP_OPA_VAL 0x80 /* originator proc. assoc. valid */
+#define FC_SPP_RPA_VAL 0x40 /* responder proc. assoc. valid */
+#define FC_SPP_EST_IMG_PAIR 0x20 /* establish image pair */
+#define FC_SPP_RESP_MASK 0x0f /* mask for response code (below) */
+
+/*
+ * SPP response code in spp_flags - lower 4 bits.
+ */
+enum fc_els_spp_resp {
+ FC_SPP_RESP_ACK = 1, /* request executed */
+ FC_SPP_RESP_RES = 2, /* unable due to lack of resources */
+ FC_SPP_RESP_INIT = 3, /* initialization not complete */
+ FC_SPP_RESP_NO_PA = 4, /* unknown process associator */
+ FC_SPP_RESP_CONF = 5, /* configuration precludes image pair */
+ FC_SPP_RESP_COND = 6, /* request completed conditionally */
+ FC_SPP_RESP_MULT = 7, /* unable to handle multiple SPPs */
+ FC_SPP_RESP_INVL = 8, /* SPP is invalid */
+};
+
+/*
+ * ELS_RRQ - Reinstate Recovery Qualifier
+ */
+struct fc_els_rrq {
+ __u8 rrq_cmd; /* command (0x12) */
+ __u8 rrq_zero[3]; /* specified as zero - part of cmd */
+ __u8 rrq_resvd; /* reserved */
+ __u8 rrq_s_id[3]; /* originator FID */
+ __be16 rrq_ox_id; /* originator exchange ID */
+ __be16 rrq_rx_id; /* responders exchange ID */
+};
+
+/*
+ * ELS_REC - Read exchange concise.
+ */
+struct fc_els_rec {
+ __u8 rec_cmd; /* command (0x13) */
+ __u8 rec_zero[3]; /* specified as zero - part of cmd */
+ __u8 rec_resvd; /* reserved */
+ __u8 rec_s_id[3]; /* originator FID */
+ __be16 rec_ox_id; /* originator exchange ID */
+ __be16 rec_rx_id; /* responders exchange ID */
+};
+
+/*
+ * ELS_REC LS_ACC payload.
+ */
+struct fc_els_rec_acc {
+ __u8 reca_cmd; /* accept (0x02) */
+ __u8 reca_zero[3]; /* specified as zero - part of cmd */
+ __be16 reca_ox_id; /* originator exchange ID */
+ __be16 reca_rx_id; /* responders exchange ID */
+ __u8 reca_resvd1; /* reserved */
+ __u8 reca_ofid[3]; /* originator FID */
+ __u8 reca_resvd2; /* reserved */
+ __u8 reca_rfid[3]; /* responder FID */
+ __be32 reca_fc4value; /* FC4 value */
+ __be32 reca_e_stat; /* ESB (exchange status block) status */
+};
+
+/*
+ * ELS_PRLI - Process login request and response.
+ */
+struct fc_els_prli {
+ __u8 prli_cmd; /* command */
+ __u8 prli_spp_len; /* length of each serv. parm. page */
+ __be16 prli_len; /* length of entire payload */
+ /* service parameter pages follow */
+};
+
+/*
+ * ELS_LOGO - process or fabric logout.
+ */
+struct fc_els_logo {
+ __u8 fl_cmd; /* command code */
+ __u8 fl_zero[3]; /* specified as zero - part of cmd */
+ __u8 fl_resvd; /* reserved */
+ __u8 fl_n_port_id[3];/* N port ID */
+ __be64 fl_n_port_wwn; /* port name */
+};
+
+/*
+ * ELS_RTV - read timeout value.
+ */
+struct fc_els_rtv {
+ __u8 rtv_cmd; /* command code 0x0e */
+ __u8 rtv_zero[3]; /* specified as zero - part of cmd */
+};
+
+/*
+ * LS_ACC for ELS_RTV - read timeout value.
+ */
+struct fc_els_rtv_acc {
+ __u8 rtv_cmd; /* command code 0x02 */
+ __u8 rtv_zero[3]; /* specified as zero - part of cmd */
+ __be32 rtv_r_a_tov; /* resource allocation timeout value */
+ __be32 rtv_e_d_tov; /* error detection timeout value */
+ __be32 rtv_toq; /* timeout qualifier (see below) */
+};
+
+/*
+ * rtv_toq bits.
+ */
+#define FC_ELS_RTV_EDRES (1 << 26) /* E_D_TOV resolution is nS else mS */
+#define FC_ELS_RTV_RTTOV (1 << 19) /* R_T_TOV is 100 uS else 100 mS */
+
+/*
+ * ELS_SCR - state change registration payload.
+ */
+struct fc_els_scr {
+ __u8 scr_cmd; /* command code */
+ __u8 scr_resv[6]; /* reserved */
+ __u8 scr_reg_func; /* registration function (see below) */
+};
+
+enum fc_els_scr_func {
+ ELS_SCRF_FAB = 1, /* fabric-detected registration */
+ ELS_SCRF_NPORT = 2, /* Nx_Port-detected registration */
+ ELS_SCRF_FULL = 3, /* full registration */
+ ELS_SCRF_CLEAR = 255, /* remove any current registrations */
+};
+
+/*
+ * ELS_RSCN - registered state change notification payload.
+ */
+struct fc_els_rscn {
+ __u8 rscn_cmd; /* RSCN opcode (0x61) */
+ __u8 rscn_page_len; /* page length (4) */
+ __be16 rscn_plen; /* payload length including this word */
+
+ /* followed by 4-byte generic affected Port_ID pages */
+};
+
+struct fc_els_rscn_page {
+ __u8 rscn_page_flags; /* event and address format */
+ __u8 rscn_fid[3]; /* fabric ID */
+};
+
+#define ELS_RSCN_EV_QUAL_BIT 2 /* shift count for event qualifier */
+#define ELS_RSCN_EV_QUAL_MASK 0xf /* mask for event qualifier */
+#define ELS_RSCN_ADDR_FMT_BIT 0 /* shift count for address format */
+#define ELS_RSCN_ADDR_FMT_MASK 0x3 /* mask for address format */
+
+enum fc_els_rscn_ev_qual {
+ ELS_EV_QUAL_NONE = 0, /* unspecified */
+ ELS_EV_QUAL_NS_OBJ = 1, /* changed name server object */
+ ELS_EV_QUAL_PORT_ATTR = 2, /* changed port attribute */
+ ELS_EV_QUAL_SERV_OBJ = 3, /* changed service object */
+ ELS_EV_QUAL_SW_CONFIG = 4, /* changed switch configuration */
+ ELS_EV_QUAL_REM_OBJ = 5, /* removed object */
+};
+
+enum fc_els_rscn_addr_fmt {
+ ELS_ADDR_FMT_PORT = 0, /* rscn_fid is a port address */
+ ELS_ADDR_FMT_AREA = 1, /* rscn_fid is a area address */
+ ELS_ADDR_FMT_DOM = 2, /* rscn_fid is a domain address */
+ ELS_ADDR_FMT_FAB = 3, /* anything on fabric may have changed */
+};
+
+/*
+ * ELS_RNID - request Node ID.
+ */
+struct fc_els_rnid {
+ __u8 rnid_cmd; /* RNID opcode (0x78) */
+ __u8 rnid_resv[3]; /* reserved */
+ __u8 rnid_fmt; /* data format */
+ __u8 rnid_resv2[3]; /* reserved */
+};
+
+/*
+ * Node Identification Data formats (rnid_fmt)
+ */
+enum fc_els_rnid_fmt {
+ ELS_RNIDF_NONE = 0, /* no specific identification data */
+ ELS_RNIDF_GEN = 0xdf, /* general topology discovery format */
+};
+
+/*
+ * ELS_RNID response.
+ */
+struct fc_els_rnid_resp {
+ __u8 rnid_cmd; /* response code (LS_ACC) */
+ __u8 rnid_resv[3]; /* reserved */
+ __u8 rnid_fmt; /* data format */
+ __u8 rnid_cid_len; /* common ID data length */
+ __u8 rnid_resv2; /* reserved */
+ __u8 rnid_sid_len; /* specific ID data length */
+};
+
+struct fc_els_rnid_cid {
+ __be64 rnid_wwpn; /* N port name */
+ __be64 rnid_wwnn; /* node name */
+};
+
+struct fc_els_rnid_gen {
+ __u8 rnid_vend_id[16]; /* vendor-unique ID */
+ __be32 rnid_atype; /* associated type (see below) */
+ __be32 rnid_phys_port; /* physical port number */
+ __be32 rnid_att_nodes; /* number of attached nodes */
+ __u8 rnid_node_mgmt; /* node management (see below) */
+ __u8 rnid_ip_ver; /* IP version (see below) */
+ __be16 rnid_prot_port; /* UDP / TCP port number */
+ __be32 rnid_ip_addr[4]; /* IP address */
+ __u8 rnid_resvd[2]; /* reserved */
+ __be16 rnid_vend_spec; /* vendor-specific field */
+};
+
+enum fc_els_rnid_atype {
+ ELS_RNIDA_UNK = 0x01, /* unknown */
+ ELS_RNIDA_OTHER = 0x02, /* none of the following */
+ ELS_RNIDA_HUB = 0x03,
+ ELS_RNIDA_SWITCH = 0x04,
+ ELS_RNIDA_GATEWAY = 0x05,
+ ELS_RNIDA_CONV = 0x06, /* Obsolete, do not use this value */
+ ELS_RNIDA_HBA = 0x07, /* Obsolete, do not use this value */
+ ELS_RNIDA_PROXY = 0x08, /* Obsolete, do not use this value */
+ ELS_RNIDA_STORAGE = 0x09,
+ ELS_RNIDA_HOST = 0x0a,
+ ELS_RNIDA_SUBSYS = 0x0b, /* storage subsystem (e.g., RAID) */
+ ELS_RNIDA_ACCESS = 0x0e, /* access device (e.g. media changer) */
+ ELS_RNIDA_NAS = 0x11, /* NAS server */
+ ELS_RNIDA_BRIDGE = 0x12, /* bridge */
+ ELS_RNIDA_VIRT = 0x13, /* virtualization device */
+ ELS_RNIDA_MF = 0xff, /* multifunction device (bits below) */
+ ELS_RNIDA_MF_HUB = 1UL << 31, /* hub */
+ ELS_RNIDA_MF_SW = 1UL << 30, /* switch */
+ ELS_RNIDA_MF_GW = 1UL << 29, /* gateway */
+ ELS_RNIDA_MF_ST = 1UL << 28, /* storage */
+ ELS_RNIDA_MF_HOST = 1UL << 27, /* host */
+ ELS_RNIDA_MF_SUB = 1UL << 26, /* storage subsystem */
+ ELS_RNIDA_MF_ACC = 1UL << 25, /* storage access dev */
+ ELS_RNIDA_MF_WDM = 1UL << 24, /* wavelength division mux */
+ ELS_RNIDA_MF_NAS = 1UL << 23, /* NAS server */
+ ELS_RNIDA_MF_BR = 1UL << 22, /* bridge */
+ ELS_RNIDA_MF_VIRT = 1UL << 21, /* virtualization device */
+};
+
+enum fc_els_rnid_mgmt {
+ ELS_RNIDM_SNMP = 0,
+ ELS_RNIDM_TELNET = 1,
+ ELS_RNIDM_HTTP = 2,
+ ELS_RNIDM_HTTPS = 3,
+ ELS_RNIDM_XML = 4, /* HTTP + XML */
+};
+
+enum fc_els_rnid_ipver {
+ ELS_RNIDIP_NONE = 0, /* no IP support or node mgmt. */
+ ELS_RNIDIP_V4 = 1, /* IPv4 */
+ ELS_RNIDIP_V6 = 2, /* IPv6 */
+};
+
+/*
+ * ELS RPL - Read Port List.
+ */
+struct fc_els_rpl {
+ __u8 rpl_cmd; /* command */
+ __u8 rpl_resv[5]; /* reserved - must be zero */
+ __be16 rpl_max_size; /* maximum response size or zero */
+ __u8 rpl_resv1; /* reserved - must be zero */
+ __u8 rpl_index[3]; /* starting index */
+};
+
+/*
+ * Port number block in RPL response.
+ */
+struct fc_els_pnb {
+ __be32 pnb_phys_pn; /* physical port number */
+ __u8 pnb_resv; /* reserved */
+ __u8 pnb_port_id[3]; /* port ID */
+ __be64 pnb_wwpn; /* port name */
+};
+
+/*
+ * RPL LS_ACC response.
+ */
+struct fc_els_rpl_resp {
+ __u8 rpl_cmd; /* ELS_LS_ACC */
+ __u8 rpl_resv1; /* reserved - must be zero */
+ __be16 rpl_plen; /* payload length */
+ __u8 rpl_resv2; /* reserved - must be zero */
+ __u8 rpl_llen[3]; /* list length */
+ __u8 rpl_resv3; /* reserved - must be zero */
+ __u8 rpl_index[3]; /* starting index */
+ struct fc_els_pnb rpl_pnb[1]; /* variable number of PNBs */
+};
+
+/*
+ * Link Error Status Block.
+ */
+struct fc_els_lesb {
+ __be32 lesb_link_fail; /* link failure count */
+ __be32 lesb_sync_loss; /* loss of synchronization count */
+ __be32 lesb_sig_loss; /* loss of signal count */
+ __be32 lesb_prim_err; /* primitive sequence error count */
+ __be32 lesb_inv_word; /* invalid transmission word count */
+ __be32 lesb_inv_crc; /* invalid CRC count */
+};
+
+/*
+ * ELS RPS - Read Port Status Block request.
+ */
+struct fc_els_rps {
+ __u8 rps_cmd; /* command */
+ __u8 rps_resv[2]; /* reserved - must be zero */
+ __u8 rps_flag; /* flag - see below */
+ __be64 rps_port_spec; /* port selection */
+};
+
+enum fc_els_rps_flag {
+ FC_ELS_RPS_DID = 0x00, /* port identified by D_ID of req. */
+ FC_ELS_RPS_PPN = 0x01, /* port_spec is physical port number */
+ FC_ELS_RPS_WWPN = 0x02, /* port_spec is port WWN */
+};
+
+/*
+ * ELS RPS LS_ACC response.
+ */
+struct fc_els_rps_resp {
+ __u8 rps_cmd; /* command - LS_ACC */
+ __u8 rps_resv[2]; /* reserved - must be zero */
+ __u8 rps_flag; /* flag - see below */
+ __u8 rps_resv2[2]; /* reserved */
+ __be16 rps_status; /* port status - see below */
+ struct fc_els_lesb rps_lesb; /* link error status block */
+};
+
+enum fc_els_rps_resp_flag {
+ FC_ELS_RPS_LPEV = 0x01, /* L_port extension valid */
+};
+
+enum fc_els_rps_resp_status {
+ FC_ELS_RPS_PTP = 1 << 5, /* point-to-point connection */
+ FC_ELS_RPS_LOOP = 1 << 4, /* loop mode */
+ FC_ELS_RPS_FAB = 1 << 3, /* fabric present */
+ FC_ELS_RPS_NO_SIG = 1 << 2, /* loss of signal */
+ FC_ELS_RPS_NO_SYNC = 1 << 1, /* loss of synchronization */
+ FC_ELS_RPS_RESET = 1 << 0, /* in link reset protocol */
+};
+
+/*
+ * ELS LIRR - Link Incident Record Registration request.
+ */
+struct fc_els_lirr {
+ __u8 lirr_cmd; /* command */
+ __u8 lirr_resv[3]; /* reserved - must be zero */
+ __u8 lirr_func; /* registration function */
+ __u8 lirr_fmt; /* FC-4 type of RLIR requested */
+ __u8 lirr_resv2[2]; /* reserved - must be zero */
+};
+
+enum fc_els_lirr_func {
+ ELS_LIRR_SET_COND = 0x01, /* set - conditionally receive */
+ ELS_LIRR_SET_UNCOND = 0x02, /* set - unconditionally receive */
+ ELS_LIRR_CLEAR = 0xff /* clear registration */
+};
+
+/*
+ * ELS SRL - Scan Remote Loop request.
+ */
+struct fc_els_srl {
+ __u8 srl_cmd; /* command */
+ __u8 srl_resv[3]; /* reserved - must be zero */
+ __u8 srl_flag; /* flag - see below */
+ __u8 srl_flag_param[3]; /* flag parameter */
+};
+
+enum fc_els_srl_flag {
+ FC_ELS_SRL_ALL = 0x00, /* scan all FL ports */
+ FC_ELS_SRL_ONE = 0x01, /* scan specified loop */
+ FC_ELS_SRL_EN_PER = 0x02, /* enable periodic scanning (param) */
+ FC_ELS_SRL_DIS_PER = 0x03, /* disable periodic scanning */
+};
+
+/*
+ * ELS RLS - Read Link Error Status Block request.
+ */
+struct fc_els_rls {
+ __u8 rls_cmd; /* command */
+ __u8 rls_resv[4]; /* reserved - must be zero */
+ __u8 rls_port_id[3]; /* port ID */
+};
+
+/*
+ * ELS RLS LS_ACC Response.
+ */
+struct fc_els_rls_resp {
+ __u8 rls_cmd; /* ELS_LS_ACC */
+ __u8 rls_resv[3]; /* reserved - must be zero */
+ struct fc_els_lesb rls_lesb; /* link error status block */
+};
+
+/*
+ * ELS RLIR - Registered Link Incident Report.
+ * This is followed by the CLIR and the CLID, described below.
+ */
+struct fc_els_rlir {
+ __u8 rlir_cmd; /* command */
+ __u8 rlir_resv[3]; /* reserved - must be zero */
+ __u8 rlir_fmt; /* format (FC4-type if type specific) */
+ __u8 rlir_clr_len; /* common link incident record length */
+ __u8 rlir_cld_len; /* common link incident desc. length */
+ __u8 rlir_slr_len; /* spec. link incident record length */
+};
+
+/*
+ * CLIR - Common Link Incident Record Data. - Sent via RLIR.
+ */
+struct fc_els_clir {
+ __be64 clir_wwpn; /* incident port name */
+ __be64 clir_wwnn; /* incident port node name */
+ __u8 clir_port_type; /* incident port type */
+ __u8 clir_port_id[3]; /* incident port ID */
+
+ __be64 clir_conn_wwpn; /* connected port name */
+ __be64 clir_conn_wwnn; /* connected node name */
+ __be64 clir_fab_name; /* fabric name */
+ __be32 clir_phys_port; /* physical port number */
+ __be32 clir_trans_id; /* transaction ID */
+ __u8 clir_resv[3]; /* reserved */
+ __u8 clir_ts_fmt; /* time stamp format */
+ __be64 clir_timestamp; /* time stamp */
+};
+
+/*
+ * CLIR clir_ts_fmt - time stamp format values.
+ */
+enum fc_els_clir_ts_fmt {
+ ELS_CLIR_TS_UNKNOWN = 0, /* time stamp field unknown */
+ ELS_CLIR_TS_SEC_FRAC = 1, /* time in seconds and fractions */
+ ELS_CLIR_TS_CSU = 2, /* time in clock synch update format */
+};
+
+/*
+ * Common Link Incident Descriptor - sent via RLIR.
+ */
+struct fc_els_clid {
+ __u8 clid_iq; /* incident qualifier flags */
+ __u8 clid_ic; /* incident code */
+ __be16 clid_epai; /* domain/area of ISL */
+};
+
+/*
+ * CLID incident qualifier flags.
+ */
+enum fc_els_clid_iq {
+ ELS_CLID_SWITCH = 0x20, /* incident port is a switch node */
+ ELS_CLID_E_PORT = 0x10, /* incident is an ISL (E) port */
+ ELS_CLID_SEV_MASK = 0x0c, /* severity 2-bit field mask */
+ ELS_CLID_SEV_INFO = 0x00, /* report is informational */
+ ELS_CLID_SEV_INOP = 0x08, /* link not operational */
+ ELS_CLID_SEV_DEG = 0x04, /* link degraded but operational */
+ ELS_CLID_LASER = 0x02, /* subassembly is a laser */
+ ELS_CLID_FRU = 0x01, /* format can identify a FRU */
+};
+
+/*
+ * CLID incident code.
+ */
+enum fc_els_clid_ic {
+ ELS_CLID_IC_IMPL = 1, /* implicit incident */
+ ELS_CLID_IC_BER = 2, /* bit-error-rate threshold exceeded */
+ ELS_CLID_IC_LOS = 3, /* loss of synch or signal */
+ ELS_CLID_IC_NOS = 4, /* non-operational primitive sequence */
+ ELS_CLID_IC_PST = 5, /* primitive sequence timeout */
+ ELS_CLID_IC_INVAL = 6, /* invalid primitive sequence */
+ ELS_CLID_IC_LOOP_TO = 7, /* loop initialization time out */
+ ELS_CLID_IC_LIP = 8, /* receiving LIP */
+};
+
+#endif /* _FC_ELS_H_ */
diff --git a/include/scsi/fc/fc_encaps.h b/include/scsi/fc/fc_encaps.h
new file mode 100644
index 0000000..f180c3e
--- /dev/null
+++ b/include/scsi/fc/fc_encaps.h
@@ -0,0 +1,138 @@
+/*
+ * Copyright(c) 2007 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Maintained at www.Open-FCoE.org
+ */
+#ifndef _FC_ENCAPS_H_
+#define _FC_ENCAPS_H_
+
+/*
+ * Protocol definitions from RFC 3643 - Fibre Channel Frame Encapsulation.
+ *
+ * Note: The frame length field is the number of 32-bit words in
+ * the encapsulation including the fcip_encaps_header, CRC and EOF words.
+ * The minimum frame length value in bytes is (32 + 24 + 4 + 4) * 4 = 64.
+ * The maximum frame length value in bytes is (32 + 24 + 2112 + 4 + 4) = 2172.
+ */
+#define FC_ENCAPS_MIN_FRAME_LEN 64 /* min frame len (bytes) (see above) */
+#define FC_ENCAPS_MAX_FRAME_LEN (FC_ENCAPS_MIN_FRAME_LEN + FC_MAX_PAYLOAD)
+
+#define FC_ENCAPS_VER 1 /* current version number */
+
+struct fc_encaps_hdr {
+ __u8 fc_proto; /* protocol number */
+ __u8 fc_ver; /* version of encapsulation */
+ __u8 fc_proto_n; /* ones complement of protocol */
+ __u8 fc_ver_n; /* ones complement of version */
+
+ unsigned char fc_proto_data[8]; /* protocol specific data */
+
+ __be16 fc_len_flags; /* 10-bit length/4 w/ 6 flag bits */
+ __be16 fc_len_flags_n; /* ones complement of length / flags */
+
+ /*
+ * Offset 0x10
+ */
+ __be32 fc_time[2]; /* time stamp: seconds and fraction */
+ __be32 fc_crc; /* CRC */
+ __be32 fc_sof; /* start of frame (see FC_SOF below) */
+
+ /* 0x20 - FC frame content followed by EOF word */
+};
+
+#define FCIP_ENCAPS_HDR_LEN 0x20 /* expected length for asserts */
+
+/*
+ * Macro's for making redundant copies of EOF and SOF.
+ */
+#define FC_XY(x, y) ((((x) & 0xff) << 8) | ((y) & 0xff))
+#define FC_XYXY(x, y) ((FCIP_XY(x, y) << 16) | FCIP_XY(x, y))
+#define FC_XYNN(x, y) (FCIP_XYXY(x, y) ^ 0xffff)
+
+#define FC_SOF_ENCODE(n) FC_XYNN(n, n)
+#define FC_EOF_ENCODE(n) FC_XYNN(n, n)
+
+/*
+ * SOF / EOF bytes.
+ */
+enum fc_sof {
+ FC_SOF_F = 0x28, /* fabric */
+ FC_SOF_I4 = 0x29, /* initiate class 4 */
+ FC_SOF_I2 = 0x2d, /* initiate class 2 */
+ FC_SOF_I3 = 0x2e, /* initiate class 3 */
+ FC_SOF_N4 = 0x31, /* normal class 4 */
+ FC_SOF_N2 = 0x35, /* normal class 2 */
+ FC_SOF_N3 = 0x36, /* normal class 3 */
+ FC_SOF_C4 = 0x39, /* activate class 4 */
+} __attribute__((packed));
+
+enum fc_eof {
+ FC_EOF_N = 0x41, /* normal (not last frame of seq) */
+ FC_EOF_T = 0x42, /* terminate (last frame of sequence) */
+ FC_EOF_RT = 0x44,
+ FC_EOF_DT = 0x46, /* disconnect-terminate class-1 */
+ FC_EOF_NI = 0x49, /* normal-invalid */
+ FC_EOF_DTI = 0x4e, /* disconnect-terminate-invalid */
+ FC_EOF_RTI = 0x4f,
+ FC_EOF_A = 0x50, /* abort */
+} __attribute__((packed));
+
+#define FC_SOF_CLASS_MASK 0x06 /* mask for class of service in SOF */
+
+/*
+ * Define classes in terms of the SOF code (initial).
+ */
+enum fc_class {
+ FC_CLASS_NONE = 0, /* software value indicating no class */
+ FC_CLASS_2 = FC_SOF_I2,
+ FC_CLASS_3 = FC_SOF_I3,
+ FC_CLASS_4 = FC_SOF_I4,
+ FC_CLASS_F = FC_SOF_F,
+};
+
+/*
+ * Determine whether SOF code indicates the need for a BLS ACK.
+ */
+static inline int fc_sof_needs_ack(enum fc_sof sof)
+{
+ return (~sof) & 0x02; /* true for class 1, 2, 4, 6, or F */
+}
+
+/*
+ * Given an fc_class, return the normal (non-initial) SOF value.
+ */
+static inline enum fc_sof fc_sof_normal(enum fc_class class)
+{
+ return class + FC_SOF_N3 - FC_SOF_I3; /* diff is always 8 */
+}
+
+/*
+ * Compute class from SOF value.
+ */
+static inline enum fc_class fc_sof_class(enum fc_sof sof)
+{
+ return (sof & 0x7) | FC_SOF_F;
+}
+
+/*
+ * Determine whether SOF is for the initial frame of a sequence.
+ */
+static inline int fc_sof_is_init(enum fc_sof sof)
+{
+ return sof < 0x30;
+}
+
+#endif /* _FC_ENCAPS_H_ */
diff --git a/include/scsi/fc/fc_fc2.h b/include/scsi/fc/fc_fc2.h
new file mode 100644
index 0000000..cff8a8c
--- /dev/null
+++ b/include/scsi/fc/fc_fc2.h
@@ -0,0 +1,124 @@
+/*
+ * Copyright(c) 2007 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Maintained at www.Open-FCoE.org
+ */
+
+#ifndef _FC_FC2_H_
+#define _FC_FC2_H_
+
+/*
+ * Fibre Channel Exchanges and Sequences.
+ */
+#ifndef PACKED
+#define PACKED __attribute__ ((__packed__))
+#endif /* PACKED */
+
+
+/*
+ * Sequence Status Block.
+ * This format is set by the FC-FS standard and is sent over the wire.
+ * Note that the fields aren't all naturally aligned.
+ */
+struct fc_ssb {
+ __u8 ssb_seq_id; /* sequence ID */
+ __u8 _ssb_resvd;
+ __be16 ssb_low_seq_cnt; /* lowest SEQ_CNT */
+
+ __be16 ssb_high_seq_cnt; /* highest SEQ_CNT */
+ __be16 ssb_s_stat; /* sequence status flags */
+
+ __be16 ssb_err_seq_cnt; /* error SEQ_CNT */
+ __u8 ssb_fh_cs_ctl; /* frame header CS_CTL */
+ __be16 ssb_fh_ox_id; /* frame header OX_ID */
+ __be16 ssb_rx_id; /* responder's exchange ID */
+ __u8 _ssb_resvd2[2];
+} PACKED;
+
+/*
+ * The SSB should be 17 bytes. Since it's layout is somewhat strange,
+ * we define the size here so that code can ASSERT that the size comes out
+ * correct.
+ */
+#define FC_SSB_SIZE 17 /* length of fc_ssb for assert */
+
+/*
+ * ssb_s_stat - flags from FC-FS-2 T11/1619-D Rev 0.90.
+ */
+#define SSB_ST_RESP (1 << 15) /* sequence responder */
+#define SSB_ST_ACTIVE (1 << 14) /* sequence is active */
+#define SSB_ST_ABNORMAL (1 << 12) /* abnormal ending condition */
+
+#define SSB_ST_REQ_MASK (3 << 10) /* ACK, abort sequence condition */
+#define SSB_ST_REQ_CONT (0 << 10)
+#define SSB_ST_REQ_ABORT (1 << 10)
+#define SSB_ST_REQ_STOP (2 << 10)
+#define SSB_ST_REQ_RETRANS (3 << 10)
+
+#define SSB_ST_ABTS (1 << 9) /* ABTS protocol completed */
+#define SSB_ST_RETRANS (1 << 8) /* retransmission completed */
+#define SSB_ST_TIMEOUT (1 << 7) /* sequence timed out by recipient */
+#define SSB_ST_P_RJT (1 << 6) /* P_RJT transmitted */
+
+#define SSB_ST_CLASS_BIT 4 /* class of service field LSB */
+#define SSB_ST_CLASS_MASK 3 /* class of service mask */
+#define SSB_ST_ACK (1 << 3) /* ACK (EOFt or EOFdt) transmitted */
+
+/*
+ * Exchange Status Block.
+ * This format is set by the FC-FS standard and is sent over the wire.
+ * Note that the fields aren't all naturally aligned.
+ */
+struct fc_esb {
+ __u8 esb_cs_ctl; /* CS_CTL for frame header */
+ __be16 esb_ox_id; /* originator exchange ID */
+ __be16 esb_rx_id; /* responder exchange ID */
+ __be32 esb_orig_fid; /* fabric ID of originator */
+ __be32 esb_resp_fid; /* fabric ID of responder */
+ __be32 esb_e_stat; /* status */
+ __u8 _esb_resvd[4];
+ __u8 esb_service_params[112]; /* TBD */
+ __u8 esb_seq_status[8]; /* sequence statuses, 8 bytes each */
+} __attribute__((packed));;
+
+
+/*
+ * Define expected size for ASSERTs.
+ * See comments on FC_SSB_SIZE.
+ */
+#define FC_ESB_SIZE (1 + 5*4 + 112 + 8) /* expected size */
+
+/*
+ * esb_e_stat - flags from FC-FS-2 T11/1619-D Rev 0.90.
+ */
+#define ESB_ST_RESP (1 << 31) /* responder to exchange */
+#define ESB_ST_SEQ_INIT (1 << 30) /* port holds sequence initiaive */
+#define ESB_ST_COMPLETE (1 << 29) /* exchange is complete */
+#define ESB_ST_ABNORMAL (1 << 28) /* abnormal ending condition */
+#define ESB_ST_REC_QUAL (1 << 26) /* recovery qualifier active */
+
+#define ESB_ST_ERRP_BIT 24 /* LSB for error policy */
+#define ESB_ST_ERRP_MASK (3 << 24) /* mask for error policy */
+#define ESB_ST_ERRP_MULT (0 << 24) /* abort, discard multiple sequences */
+#define ESB_ST_ERRP_SING (1 << 24) /* abort, discard single sequence */
+#define ESB_ST_ERRP_INF (2 << 24) /* process with infinite buffers */
+#define ESB_ST_ERRP_IMM (3 << 24) /* discard mult. with immed. retran. */
+
+#define ESB_ST_OX_ID_INVL (1 << 23) /* originator XID invalid */
+#define ESB_ST_RX_ID_INVL (1 << 22) /* responder XID invalid */
+#define ESB_ST_PRI_INUSE (1 << 21) /* priority / preemption in use */
+
+#endif /* _FC_FC2_H_ */
diff --git a/include/scsi/fc/fc_fcoe.h b/include/scsi/fc/fc_fcoe.h
new file mode 100644
index 0000000..59c9d0c
--- /dev/null
+++ b/include/scsi/fc/fc_fcoe.h
@@ -0,0 +1,100 @@
+/*
+ * Copyright(c) 2007 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Maintained at www.Open-FCoE.org
+ */
+
+#ifndef _FC_FCOE_H_
+#define _FC_FCOE_H_
+
+/*
+ * FCoE - Fibre Channel over Ethernet.
+ */
+
+/*
+ * The FCoE ethertype eventually goes in net/if_ether.h.
+ */
+#ifndef ETH_P_FCOE
+#define ETH_P_FCOE 0x8906 /* FCOE ether type */
+#endif
+
+/*
+ * FC_FCOE_OUI hasn't been standardized yet. XXX TBD.
+ */
+#ifndef FC_FCOE_OUI
+#define FC_FCOE_OUI 0x0efc00 /* upper 24 bits of FCOE dest MAC TBD */
+#endif
+
+/*
+ * The destination MAC address for the fabric login may get a different OUI.
+ * This isn't standardized yet.
+ */
+#ifndef FC_FCOE_FLOGI_MAC
+/* gateway MAC - TBD */
+#define FC_FCOE_FLOGI_MAC { 0x0e, 0xfc, 0x00, 0xff, 0xff, 0xfe }
+#endif
+
+#define FC_FCOE_VER 0 /* version */
+
+/*
+ * Ethernet Addresses based on FC S_ID and D_ID.
+ * Generated by FC_FCOE_OUI | S_ID/D_ID
+ */
+#define FC_FCOE_ENCAPS_ID(n) (((u64) FC_FCOE_OUI << 24) | (n))
+#define FC_FCOE_DECAPS_ID(n) ((n) >> 24)
+
+/*
+ * FCoE frame header - 14 bytes
+ *
+ * This is the August 2007 version of the FCoE header as defined by T11.
+ * This follows the VLAN header, which includes the ethertype.
+ */
+struct fcoe_hdr {
+ __u8 fcoe_ver; /* version field - upper 4 bits */
+ __u8 fcoe_resvd[12]; /* reserved - send zero and ignore */
+ __u8 fcoe_sof; /* start of frame per RFC 3643 */
+};
+
+#define FC_FCOE_DECAPS_VER(hp) ((hp)->fcoe_ver >> 4)
+#define FC_FCOE_ENCAPS_VER(hp, ver) ((hp)->fcoe_ver = (ver) << 4)
+
+/*
+ * FCoE CRC & EOF - 8 bytes.
+ */
+struct fcoe_crc_eof {
+ __le32 fcoe_crc32; /* CRC for FC packet */
+ __u8 fcoe_eof; /* EOF from RFC 3643 */
+ __u8 fcoe_resvd[3]; /* reserved - send zero and ignore */
+} __attribute__((packed));
+
+/*
+ * Store OUI + DID into MAC address field.
+ */
+static inline void fc_fcoe_set_mac(u8 *mac, u8 *did)
+{
+ mac[0] = (u8) (FC_FCOE_OUI >> 16);
+ mac[1] = (u8) (FC_FCOE_OUI >> 8);
+ mac[2] = (u8) FC_FCOE_OUI;
+ mac[3] = did[0];
+ mac[4] = did[1];
+ mac[5] = did[2];
+}
+
+#ifndef ETH_P_8021Q
+#define ETH_P_8021Q 0x8100
+#endif
+
+#endif /* _FC_FCOE_H_ */
diff --git a/include/scsi/fc/fc_fcp.h b/include/scsi/fc/fc_fcp.h
new file mode 100644
index 0000000..5d38f19
--- /dev/null
+++ b/include/scsi/fc/fc_fcp.h
@@ -0,0 +1,199 @@
+/*
+ * Copyright(c) 2007 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Maintained at www.Open-FCoE.org
+ */
+
+#ifndef _FC_FCP_H_
+#define _FC_FCP_H_
+
+/*
+ * Fibre Channel Protocol for SCSI.
+ * From T10 FCP-3, T10 project 1560-D Rev 4, Sept. 13, 2005.
+ */
+
+/*
+ * fc/fs.h defines FC_TYPE_FCP.
+ */
+
+/*
+ * Service parameter page parameters (word 3 bits) for Process Login.
+ */
+#define FCP_SPPF_TASK_RETRY_ID 0x0200 /* task retry ID requested */
+#define FCP_SPPF_RETRY 0x0100 /* retry supported */
+#define FCP_SPPF_CONF_COMPL 0x0080 /* confirmed completion allowed */
+#define FCP_SPPF_OVLY_ALLOW 0x0040 /* data overlay allowed */
+#define FCP_SPPF_INIT_FCN 0x0020 /* initiator function */
+#define FCP_SPPF_TARG_FCN 0x0010 /* target function */
+#define FCP_SPPF_RD_XRDY_DIS 0x0002 /* disable XFER_RDY for reads */
+#define FCP_SPPF_WR_XRDY_DIS 0x0001 /* disable XFER_RDY for writes */
+
+/*
+ * FCP_CMND IU Payload.
+ */
+struct fcp_cmnd {
+ __u8 fc_lun[8]; /* logical unit number */
+ __u8 fc_cmdref; /* commmand reference number */
+ __u8 fc_pri_ta; /* priority and task attribute */
+ __u8 fc_tm_flags; /* task management flags */
+ __u8 fc_flags; /* additional len & flags */
+ __u8 fc_cdb[16]; /* base CDB */
+ __be32 fc_dl; /* data length (must follow fc_cdb) */
+};
+
+#define FCP_CMND_LEN 32 /* expected length of structure */
+
+struct fcp_cmnd32 {
+ __u8 fc_lun[8]; /* logical unit number */
+ __u8 fc_cmdref; /* commmand reference number */
+ __u8 fc_pri_ta; /* priority and task attribute */
+ __u8 fc_tm_flags; /* task management flags */
+ __u8 fc_flags; /* additional len & flags */
+ __u8 fc_cdb[32]; /* base CDB */
+ __be32 fc_dl; /* data length (must follow fc_cdb) */
+};
+
+#define FCP_CMND32_LEN 48 /* expected length of structure */
+#define FCP_CMND32_ADD_LEN (16 / 4) /* Additional cdb length */
+
+/*
+ * fc_pri_ta.
+ */
+#define FCP_PTA_SIMPLE 0 /* simple task attribute */
+#define FCP_PTA_HEADQ 1 /* head of queue task attribute */
+#define FCP_PTA_ORDERED 2 /* ordered task attribute */
+#define FCP_PTA_ACA 4 /* auto. contigent allegiance */
+#define FCP_PRI_SHIFT 3 /* priority field starts in bit 3 */
+#define FCP_PRI_RESVD_MASK 0x80 /* reserved bits in priority field */
+
+/*
+ * fc_tm_flags - task management flags field.
+ */
+#define FCP_TMF_CLR_ACA 0x40 /* clear ACA condition */
+#define FCP_TMF_LUN_RESET 0x10 /* logical unit reset task management */
+#define FCP_TMF_CLR_TASK_SET 0x04 /* clear task set */
+#define FCP_TMF_ABT_TASK_SET 0x02 /* abort task set */
+
+/*
+ * fc_flags.
+ * Bits 7:2 are the additional FCP_CDB length / 4.
+ */
+#define FCP_CFL_LEN_MASK 0xfc /* mask for additional length */
+#define FCP_CFL_LEN_SHIFT 2 /* shift bits for additional length */
+#define FCP_CFL_RDDATA 0x02 /* read data */
+#define FCP_CFL_WRDATA 0x01 /* write data */
+
+/*
+ * FCP_TXRDY IU - transfer ready payload.
+ */
+struct fcp_txrdy {
+ __be32 ft_data_ro; /* data relative offset */
+ __be32 ft_burst_len; /* burst length */
+ __u8 _ft_resvd[4]; /* reserved */
+};
+
+#define FCP_TXRDY_LEN 12 /* expected length of structure */
+
+/*
+ * FCP_RESP IU - response payload.
+ *
+ * The response payload comes in three parts: the flags/status, the
+ * sense/response lengths and the sense data/response info section.
+ *
+ * From FCP3r04, note 6 of section 9.5.13:
+ *
+ * Some early implementations presented the FCP_RSP IU without the FCP_RESID,
+ * FCP_SNS_LEN, and FCP_RSP_LEN fields if the FCP_RESID_UNDER, FCP_RESID_OVER,
+ * FCP_SNS_LEN_VALID, and FCP_RSP_LEN_VALID bits were all set to zero. This
+ * non-standard behavior should be tolerated.
+ *
+ * All response frames will always contain the fcp_resp template. Some
+ * will also include the fcp_resp_len template.
+ */
+struct fcp_resp {
+ __u8 _fr_resvd[8]; /* reserved */
+ __be16 fr_retry_delay; /* retry delay timer */
+ __u8 fr_flags; /* flags */
+ __u8 fr_status; /* SCSI status code */
+};
+
+#define FCP_RESP_LEN 12 /* expected length of structure */
+
+struct fcp_resp_ext {
+ __be32 fr_resid; /* Residual value */
+ __be32 fr_sns_len; /* SCSI Sense length */
+ __be32 fr_rsp_len; /* Response Info length */
+
+ /*
+ * Optionally followed by RSP info and/or SNS info and/or
+ * bidirectional read residual length, if any.
+ */
+};
+
+#define FCP_RESP_EXT_LEN 12 /* expected length of the structure */
+
+struct fcp_resp_rsp_info {
+ __u8 _fr_resvd[3]; /* reserved */
+ __u8 rsp_code; /* Response Info Code */
+ __u8 _fr_resvd2[4]; /* reserved */
+};
+
+struct fcp_resp_with_ext {
+ struct fcp_resp resp;
+ struct fcp_resp_ext ext;
+};
+
+#define FCP_RESP_WITH_EXT (FCP_RESP_LEN + FCP_RESP_EXT_LEN)
+
+/*
+ * fr_flags.
+ */
+#define FCP_BIDI_RSP 0x80 /* bidirectional read response */
+#define FCP_BIDI_READ_UNDER 0x40 /* bidir. read less than requested */
+#define FCP_BIDI_READ_OVER 0x20 /* DL insufficient for full transfer */
+#define FCP_CONF_REQ 0x10 /* confirmation requested */
+#define FCP_RESID_UNDER 0x08 /* transfer shorter than expected */
+#define FCP_RESID_OVER 0x04 /* DL insufficient for full transfer */
+#define FCP_SNS_LEN_VAL 0x02 /* SNS_LEN field is valid */
+#define FCP_RSP_LEN_VAL 0x01 /* RSP_LEN field is valid */
+
+/*
+ * rsp_codes
+ */
+enum fcp_resp_rsp_codes {
+ FCP_TMF_CMPL = 0,
+ FCP_DATA_LEN_INVALID = 1,
+ FCP_CMND_FIELDS_INVALID = 2,
+ FCP_DATA_PARAM_MISMATCH = 3,
+ FCP_TMF_REJECTED = 4,
+ FCP_TMF_FAILED = 5,
+ FCP_TMF_INVALID_LUN = 9,
+};
+
+/*
+ * FCP SRR Link Service request - Sequence Retransmission Request.
+ */
+struct fcp_srr {
+ __u8 srr_op; /* opcode ELS_SRR */
+ __u8 srr_resvd[3]; /* opcode / reserved - must be zero */
+ __be16 srr_ox_id; /* OX_ID of failed command */
+ __be16 srr_rx_id; /* RX_ID of failed command */
+ __be32 srr_rel_off; /* relative offset */
+ __u8 srr_r_ctl; /* r_ctl for the information unit */
+ __u8 srr_resvd2[3]; /* reserved */
+};
+
+#endif /* _FC_FCP_H_ */
diff --git a/include/scsi/fc/fc_fs.h b/include/scsi/fc/fc_fs.h
new file mode 100644
index 0000000..3897c6c
--- /dev/null
+++ b/include/scsi/fc/fc_fs.h
@@ -0,0 +1,332 @@
+/*
+ * Copyright(c) 2007 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Maintained at www.Open-FCoE.org
+ */
+
+#ifndef _FC_FS_H_
+#define _FC_FS_H_
+
+/*
+ * Fibre Channel Framing and Signalling definitions.
+ * From T11 FC-FS-2 Rev 0.90 - 9 August 2005.
+ */
+
+/*
+ * Frame header
+ */
+struct fc_frame_header {
+ __u8 fh_r_ctl; /* routing control */
+ __u8 fh_d_id[3]; /* Destination ID */
+
+ __u8 fh_cs_ctl; /* class of service control / pri */
+ __u8 fh_s_id[3]; /* Source ID */
+
+ __u8 fh_type; /* see enum fc_fh_type below */
+ __u8 fh_f_ctl[3]; /* frame control */
+
+ __u8 fh_seq_id; /* sequence ID */
+ __u8 fh_df_ctl; /* data field control */
+ __be16 fh_seq_cnt; /* sequence count */
+
+ __be16 fh_ox_id; /* originator exchange ID */
+ __be16 fh_rx_id; /* responder exchange ID */
+ __be32 fh_parm_offset; /* parameter or relative offset */
+};
+
+#define FC_FRAME_HEADER_LEN 24 /* expected length of structure */
+
+#define FC_MAX_PAYLOAD 2112U /* max payload length in bytes */
+#define FC_MIN_MAX_PAYLOAD 256U /* lower limit on max payload */
+
+#define FC_MAX_FRAME (FC_MAX_PAYLOAD + FC_FRAME_HEADER_LEN)
+#define FC_MIN_MAX_FRAME (FC_MIN_MAX_PAYLOAD + FC_FRAME_HEADER_LEN)
+
+/*
+ * fh_r_ctl - Routing control definitions.
+ */
+ /*
+ * FC-4 device_data.
+ */
+enum fc_rctl {
+ FC_RCTL_DD_UNCAT = 0x00, /* uncategorized information */
+ FC_RCTL_DD_SOL_DATA = 0x01, /* solicited data */
+ FC_RCTL_DD_UNSOL_CTL = 0x02, /* unsolicited control */
+ FC_RCTL_DD_SOL_CTL = 0x03, /* solicited control or reply */
+ FC_RCTL_DD_UNSOL_DATA = 0x04, /* unsolicited data */
+ FC_RCTL_DD_DATA_DESC = 0x05, /* data descriptor */
+ FC_RCTL_DD_UNSOL_CMD = 0x06, /* unsolicited command */
+ FC_RCTL_DD_CMD_STATUS = 0x07, /* command status */
+
+#define FC_RCTL_ILS_REQ FC_RCTL_DD_UNSOL_CTL /* ILS request */
+#define FC_RCTL_ILS_REP FC_RCTL_DD_SOL_CTL /* ILS reply */
+
+ /*
+ * Extended Link_Data
+ */
+ FC_RCTL_ELS_REQ = 0x22, /* extended link services request */
+ FC_RCTL_ELS_REP = 0x23, /* extended link services reply */
+ FC_RCTL_ELS4_REQ = 0x32, /* FC-4 ELS request */
+ FC_RCTL_ELS4_REP = 0x33, /* FC-4 ELS reply */
+ /*
+ * Basic Link Services fh_r_ctl values.
+ */
+ FC_RCTL_BA_NOP = 0x80, /* basic link service NOP */
+ FC_RCTL_BA_ABTS = 0x81, /* basic link service abort */
+ FC_RCTL_BA_RMC = 0x82, /* remove connection */
+ FC_RCTL_BA_ACC = 0x84, /* basic accept */
+ FC_RCTL_BA_RJT = 0x85, /* basic reject */
+ FC_RCTL_BA_PRMT = 0x86, /* dedicated connection preempted */
+ /*
+ * Link Control Information.
+ */
+ FC_RCTL_ACK_1 = 0xc0, /* acknowledge_1 */
+ FC_RCTL_ACK_0 = 0xc1, /* acknowledge_0 */
+ FC_RCTL_P_RJT = 0xc2, /* port reject */
+ FC_RCTL_F_RJT = 0xc3, /* fabric reject */
+ FC_RCTL_P_BSY = 0xc4, /* port busy */
+ FC_RCTL_F_BSY = 0xc5, /* fabric busy to data frame */
+ FC_RCTL_F_BSYL = 0xc6, /* fabric busy to link control frame */
+ FC_RCTL_LCR = 0xc7, /* link credit reset */
+ FC_RCTL_END = 0xc9, /* end */
+};
+ /* incomplete list of definitions */
+
+/*
+ * R_CTL names initializer.
+ * Please keep this matching the above definitions.
+ */
+#define FC_RCTL_NAMES_INIT { \
+ [FC_RCTL_DD_UNCAT] = "uncat", \
+ [FC_RCTL_DD_SOL_DATA] = "sol data", \
+ [FC_RCTL_DD_UNSOL_CTL] = "unsol ctl", \
+ [FC_RCTL_DD_SOL_CTL] = "sol ctl/reply", \
+ [FC_RCTL_DD_UNSOL_DATA] = "unsol data", \
+ [FC_RCTL_DD_DATA_DESC] = "data desc", \
+ [FC_RCTL_DD_UNSOL_CMD] = "unsol cmd", \
+ [FC_RCTL_DD_CMD_STATUS] = "cmd status", \
+ [FC_RCTL_ELS_REQ] = "ELS req", \
+ [FC_RCTL_ELS_REP] = "ELS rep", \
+ [FC_RCTL_ELS4_REQ] = "FC-4 ELS req", \
+ [FC_RCTL_ELS4_REP] = "FC-4 ELS rep", \
+ [FC_RCTL_BA_NOP] = "BLS NOP", \
+ [FC_RCTL_BA_ABTS] = "BLS abort", \
+ [FC_RCTL_BA_RMC] = "BLS remove connection", \
+ [FC_RCTL_BA_ACC] = "BLS accept", \
+ [FC_RCTL_BA_RJT] = "BLS reject", \
+ [FC_RCTL_BA_PRMT] = "BLS dedicated connection preempted", \
+ [FC_RCTL_ACK_1] = "LC ACK_1", \
+ [FC_RCTL_ACK_0] = "LC ACK_0", \
+ [FC_RCTL_P_RJT] = "LC port reject", \
+ [FC_RCTL_F_RJT] = "LC fabric reject", \
+ [FC_RCTL_P_BSY] = "LC port busy", \
+ [FC_RCTL_F_BSY] = "LC fabric busy to data frame", \
+ [FC_RCTL_F_BSYL] = "LC fabric busy to link control frame",\
+ [FC_RCTL_LCR] = "LC link credit reset", \
+ [FC_RCTL_END] = "LC end", \
+}
+
+/*
+ * Well-known fabric addresses.
+ */
+enum fc_well_known_fid {
+ FC_FID_BCAST = 0xffffff, /* broadcast */
+ FC_FID_FLOGI = 0xfffffe, /* fabric login */
+ FC_FID_FCTRL = 0xfffffd, /* fabric controller */
+ FC_FID_DIR_SERV = 0xfffffc, /* directory server */
+ FC_FID_TIME_SERV = 0xfffffb, /* time server */
+ FC_FID_MGMT_SERV = 0xfffffa, /* management server */
+ FC_FID_QOS = 0xfffff9, /* QoS Facilitator */
+ FC_FID_ALIASES = 0xfffff8, /* alias server (FC-PH2) */
+ FC_FID_SEC_KEY = 0xfffff7, /* Security key dist. server */
+ FC_FID_CLOCK = 0xfffff6, /* clock synch server */
+ FC_FID_MCAST_SERV = 0xfffff5, /* multicast server */
+};
+
+#define FC_FID_WELL_KNOWN_MAX 0xffffff /* highest well-known fabric ID */
+#define FC_FID_WELL_KNOWN_BASE 0xfffff5 /* start of well-known fabric ID */
+
+/*
+ * Other well-known addresses, outside the above contiguous range.
+ */
+#define FC_FID_DOM_MGR 0xfffc00 /* domain manager base */
+
+/*
+ * Fabric ID bytes.
+ */
+#define FC_FID_DOMAIN 0
+#define FC_FID_PORT 1
+#define FC_FID_LINK 2
+
+/*
+ * fh_type codes
+ */
+enum fc_fh_type {
+ FC_TYPE_BLS = 0x00, /* basic link service */
+ FC_TYPE_ELS = 0x01, /* extended link service */
+ FC_TYPE_IP = 0x05, /* IP over FC, RFC 4338 */
+ FC_TYPE_FCP = 0x08, /* SCSI FCP */
+ FC_TYPE_CT = 0x20, /* Fibre Channel Services (FC-CT) */
+ FC_TYPE_ILS = 0x22, /* internal link service */
+};
+
+/*
+ * FC_TYPE names initializer.
+ * Please keep this matching the above definitions.
+ */
+#define FC_TYPE_NAMES_INIT { \
+ [FC_TYPE_BLS] = "BLS", \
+ [FC_TYPE_ELS] = "ELS", \
+ [FC_TYPE_IP] = "IP", \
+ [FC_TYPE_FCP] = "FCP", \
+ [FC_TYPE_CT] = "CT", \
+ [FC_TYPE_ILS] = "ILS", \
+}
+
+/*
+ * Exchange IDs.
+ */
+#define FC_XID_UNKNOWN 0xffff /* unknown exchange ID */
+
+/*
+ * fh_f_ctl - Frame control flags.
+ */
+#define FC_FC_EX_CTX (1 << 23) /* sent by responder to exchange */
+#define FC_FC_SEQ_CTX (1 << 22) /* sent by responder to sequence */
+#define FC_FC_FIRST_SEQ (1 << 21) /* first sequence of this exchange */
+#define FC_FC_LAST_SEQ (1 << 20) /* last sequence of this exchange */
+#define FC_FC_END_SEQ (1 << 19) /* last frame of sequence */
+#define FC_FC_END_CONN (1 << 18) /* end of class 1 connection pending */
+#define FC_FC_RES_B17 (1 << 17) /* reserved */
+#define FC_FC_SEQ_INIT (1 << 16) /* transfer of sequence initiative */
+#define FC_FC_X_ID_REASS (1 << 15) /* exchange ID has been changed */
+#define FC_FC_X_ID_INVAL (1 << 14) /* exchange ID invalidated */
+
+#define FC_FC_ACK_1 (1 << 12) /* 13:12 = 1: ACK_1 expected */
+#define FC_FC_ACK_N (2 << 12) /* 13:12 = 2: ACK_N expected */
+#define FC_FC_ACK_0 (3 << 12) /* 13:12 = 3: ACK_0 expected */
+
+#define FC_FC_RES_B11 (1 << 11) /* reserved */
+#define FC_FC_RES_B10 (1 << 10) /* reserved */
+#define FC_FC_RETX_SEQ (1 << 9) /* retransmitted sequence */
+#define FC_FC_UNI_TX (1 << 8) /* unidirectional transmit (class 1) */
+#define FC_FC_CONT_SEQ(i) ((i) << 6)
+#define FC_FC_ABT_SEQ(i) ((i) << 4)
+#define FC_FC_REL_OFF (1 << 3) /* parameter is relative offset */
+#define FC_FC_RES2 (1 << 2) /* reserved */
+#define FC_FC_FILL(i) ((i) & 3) /* 1:0: bytes of trailing fill */
+
+/*
+ * BA_ACC payload.
+ */
+struct fc_ba_acc {
+ __u8 ba_seq_id_val; /* SEQ_ID validity */
+#define FC_BA_SEQ_ID_VAL 0x80
+ __u8 ba_seq_id; /* SEQ_ID of seq last deliverable */
+ __u8 ba_resvd[2]; /* reserved */
+ __be16 ba_ox_id; /* OX_ID for aborted seq or exch */
+ __be16 ba_rx_id; /* RX_ID for aborted seq or exch */
+ __be16 ba_low_seq_cnt; /* low SEQ_CNT of aborted seq */
+ __be16 ba_high_seq_cnt; /* high SEQ_CNT of aborted seq */
+};
+
+/*
+ * BA_RJT: Basic Reject payload.
+ */
+struct fc_ba_rjt {
+ __u8 br_resvd; /* reserved */
+ __u8 br_reason; /* reason code */
+ __u8 br_explan; /* reason explanation */
+ __u8 br_vendor; /* vendor unique code */
+};
+
+/*
+ * BA_RJT reason codes.
+ * From FS-2.
+ */
+enum fc_ba_rjt_reason {
+ FC_BA_RJT_NONE = 0, /* in software this means no reject */
+ FC_BA_RJT_INVL_CMD = 0x01, /* invalid command code */
+ FC_BA_RJT_LOG_ERR = 0x03, /* logical error */
+ FC_BA_RJT_LOG_BUSY = 0x05, /* logical busy */
+ FC_BA_RJT_PROTO_ERR = 0x07, /* protocol error */
+ FC_BA_RJT_UNABLE = 0x09, /* unable to perform request */
+ FC_BA_RJT_VENDOR = 0xff, /* vendor-specific (see br_vendor) */
+};
+
+/*
+ * BA_RJT reason code explanations.
+ */
+enum fc_ba_rjt_explan {
+ FC_BA_RJT_EXP_NONE = 0x00, /* no additional expanation */
+ FC_BA_RJT_INV_XID = 0x03, /* invalid OX_ID-RX_ID combination */
+ FC_BA_RJT_ABT = 0x05, /* sequence aborted, no seq info */
+};
+
+/*
+ * P_RJT or F_RJT: Port Reject or Fabric Reject parameter field.
+ */
+struct fc_pf_rjt {
+ __u8 rj_action; /* reserved */
+ __u8 rj_reason; /* reason code */
+ __u8 rj_resvd; /* reserved */
+ __u8 rj_vendor; /* vendor unique code */
+};
+
+/*
+ * P_RJT and F_RJT reject reason codes.
+ */
+enum fc_pf_rjt_reason {
+ FC_RJT_NONE = 0, /* non-reject (reserved by standard) */
+ FC_RJT_INVL_DID = 0x01, /* invalid destination ID */
+ FC_RJT_INVL_SID = 0x02, /* invalid source ID */
+ FC_RJT_P_UNAV_T = 0x03, /* port unavailable, temporary */
+ FC_RJT_P_UNAV = 0x04, /* port unavailable, permanent */
+ FC_RJT_CLS_UNSUP = 0x05, /* class not supported */
+ FC_RJT_DEL_USAGE = 0x06, /* delimiter usage error */
+ FC_RJT_TYPE_UNSUP = 0x07, /* type not supported */
+ FC_RJT_LINK_CTL = 0x08, /* invalid link control */
+ FC_RJT_R_CTL = 0x09, /* invalid R_CTL field */
+ FC_RJT_F_CTL = 0x0a, /* invalid F_CTL field */
+ FC_RJT_OX_ID = 0x0b, /* invalid originator exchange ID */
+ FC_RJT_RX_ID = 0x0c, /* invalid responder exchange ID */
+ FC_RJT_SEQ_ID = 0x0d, /* invalid sequence ID */
+ FC_RJT_DF_CTL = 0x0e, /* invalid DF_CTL field */
+ FC_RJT_SEQ_CNT = 0x0f, /* invalid SEQ_CNT field */
+ FC_RJT_PARAM = 0x10, /* invalid parameter field */
+ FC_RJT_EXCH_ERR = 0x11, /* exchange error */
+ FC_RJT_PROTO = 0x12, /* protocol error */
+ FC_RJT_LEN = 0x13, /* incorrect length */
+ FC_RJT_UNEXP_ACK = 0x14, /* unexpected ACK */
+ FC_RJT_FAB_CLASS = 0x15, /* class unsupported by fabric entity */
+ FC_RJT_LOGI_REQ = 0x16, /* login required */
+ FC_RJT_SEQ_XS = 0x17, /* excessive sequences attempted */
+ FC_RJT_EXCH_EST = 0x18, /* unable to establish exchange */
+ FC_RJT_FAB_UNAV = 0x1a, /* fabric unavailable */
+ FC_RJT_VC_ID = 0x1b, /* invalid VC_ID (class 4) */
+ FC_RJT_CS_CTL = 0x1c, /* invalid CS_CTL field */
+ FC_RJT_INSUF_RES = 0x1d, /* insuff. resources for VC (Class 4) */
+ FC_RJT_INVL_CLS = 0x1f, /* invalid class of service */
+ FC_RJT_PREEMT_RJT = 0x20, /* preemption request rejected */
+ FC_RJT_PREEMT_DIS = 0x21, /* preemption not enabled */
+ FC_RJT_MCAST_ERR = 0x22, /* multicast error */
+ FC_RJT_MCAST_ET = 0x23, /* multicast error terminate */
+ FC_RJT_PRLI_REQ = 0x24, /* process login required */
+ FC_RJT_INVL_ATT = 0x25, /* invalid attachment */
+ FC_RJT_VENDOR = 0xff, /* vendor specific reject */
+};
+
+#endif /* _FC_FS_H_ */
diff --git a/include/scsi/fc/fc_gs.h b/include/scsi/fc/fc_gs.h
new file mode 100644
index 0000000..ffab027
--- /dev/null
+++ b/include/scsi/fc/fc_gs.h
@@ -0,0 +1,93 @@
+/*
+ * Copyright(c) 2007 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Maintained at www.Open-FCoE.org
+ */
+
+#ifndef _FC_GS_H_
+#define _FC_GS_H_
+
+/*
+ * Fibre Channel Services - Common Transport.
+ * From T11.org FC-GS-2 Rev 5.3 November 1998.
+ */
+
+struct fc_ct_hdr {
+ __u8 ct_rev; /* revision */
+ __u8 ct_in_id[3]; /* N_Port ID of original requestor */
+ __u8 ct_fs_type; /* type of fibre channel service */
+ __u8 ct_fs_subtype; /* subtype */
+ __u8 ct_options;
+ __u8 _ct_resvd1;
+ __be16 ct_cmd; /* command / response code */
+ __be16 ct_mr_size; /* maximum / residual size */
+ __u8 _ct_resvd2;
+ __u8 ct_reason; /* reject reason */
+ __u8 ct_explan; /* reason code explanation */
+ __u8 ct_vendor; /* vendor unique data */
+};
+
+#define FC_CT_HDR_LEN 16 /* expected sizeof (struct fc_ct_hdr) */
+
+enum fc_ct_rev {
+ FC_CT_REV = 1 /* common transport revision */
+};
+
+/*
+ * ct_fs_type values.
+ */
+enum fc_ct_fs_type {
+ FC_FST_ALIAS = 0xf8, /* alias service */
+ FC_FST_MGMT = 0xfa, /* management service */
+ FC_FST_TIME = 0xfb, /* time service */
+ FC_FST_DIR = 0xfc, /* directory service */
+};
+
+/*
+ * ct_cmd: Command / response codes
+ */
+enum fc_ct_cmd {
+ FC_FS_RJT = 0x8001, /* reject */
+ FC_FS_ACC = 0x8002, /* accept */
+};
+
+/*
+ * FS_RJT reason codes.
+ */
+enum fc_ct_reason {
+ FC_FS_RJT_CMD = 0x01, /* invalid command code */
+ FC_FS_RJT_VER = 0x02, /* invalid version level */
+ FC_FS_RJT_LOG = 0x03, /* logical error */
+ FC_FS_RJT_IUSIZ = 0x04, /* invalid IU size */
+ FC_FS_RJT_BSY = 0x05, /* logical busy */
+ FC_FS_RJT_PROTO = 0x07, /* protocol error */
+ FC_FS_RJT_UNABL = 0x09, /* unable to perform command request */
+ FC_FS_RJT_UNSUP = 0x0b, /* command not supported */
+};
+
+/*
+ * FS_RJT reason code explanations.
+ */
+enum fc_ct_explan {
+ FC_FS_EXP_NONE = 0x00, /* no additional explanation */
+ FC_FS_EXP_PID = 0x01, /* port ID not registered */
+ FC_FS_EXP_PNAM = 0x02, /* port name not registered */
+ FC_FS_EXP_NNAM = 0x03, /* node name not registered */
+ FC_FS_EXP_COS = 0x04, /* class of service not registered */
+ /* definitions not complete */
+};
+
+#endif /* _FC_GS_H_ */
diff --git a/include/scsi/fc/fc_ns.h b/include/scsi/fc/fc_ns.h
new file mode 100644
index 0000000..790d7b9
--- /dev/null
+++ b/include/scsi/fc/fc_ns.h
@@ -0,0 +1,159 @@
+/*
+ * Copyright(c) 2007 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Maintained at www.Open-FCoE.org
+ */
+
+#ifndef _FC_NS_H_
+#define _FC_NS_H_
+
+/*
+ * Fibre Channel Services - Name Service (dNS)
+ * From T11.org FC-GS-2 Rev 5.3 November 1998.
+ */
+
+/*
+ * Common-transport sub-type for Name Server.
+ */
+#define FC_NS_SUBTYPE 2 /* fs_ct_hdr.ct_fs_subtype */
+
+/*
+ * Name server Requests.
+ * Note: this is an incomplete list, some unused requests are omitted.
+ */
+enum fc_ns_req {
+ FC_NS_GA_NXT = 0x0100, /* get all next */
+ FC_NS_GI_A = 0x0101, /* get identifiers - scope */
+ FC_NS_GPN_ID = 0x0112, /* get port name by ID */
+ FC_NS_GNN_ID = 0x0113, /* get node name by ID */
+ FC_NS_GID_PN = 0x0121, /* get ID for port name */
+ FC_NS_GID_NN = 0x0131, /* get IDs for node name */
+ FC_NS_GID_FT = 0x0171, /* get IDs by FC4 type */
+ FC_NS_GPN_FT = 0x0172, /* get port names by FC4 type */
+ FC_NS_GID_PT = 0x01a1, /* get IDs by port type */
+ FC_NS_RFT_ID = 0x0217, /* reg FC4 type for ID */
+ FC_NS_RPN_ID = 0x0212, /* reg port name for ID */
+ FC_NS_RNN_ID = 0x0213, /* reg node name for ID */
+};
+
+/*
+ * Port type values.
+ */
+enum fc_ns_pt {
+ FC_NS_UNID_PORT = 0x00, /* unidentified */
+ FC_NS_N_PORT = 0x01, /* N port */
+ FC_NS_NL_PORT = 0x02, /* NL port */
+ FC_NS_FNL_PORT = 0x03, /* F/NL port */
+ FC_NS_NX_PORT = 0x7f, /* Nx port */
+ FC_NS_F_PORT = 0x81, /* F port */
+ FC_NS_FL_PORT = 0x82, /* FL port */
+ FC_NS_E_PORT = 0x84, /* E port */
+ FC_NS_B_PORT = 0x85, /* B port */
+};
+
+/*
+ * Port type object.
+ */
+struct fc_ns_pt_obj {
+ __u8 pt_type;
+};
+
+/*
+ * Port ID object
+ */
+struct fc_ns_fid {
+ __u8 fp_flags; /* flags for responses only */
+ __u8 fp_fid[3];
+};
+
+/*
+ * fp_flags in port ID object, for responses only.
+ */
+#define FC_NS_FID_LAST 0x80 /* last object */
+
+/*
+ * FC4-types object.
+ */
+#define FC_NS_TYPES 256 /* number of possible FC-4 types */
+#define FC_NS_BPW 32 /* bits per word in bitmap */
+
+struct fc_ns_fts {
+ __be32 ff_type_map[FC_NS_TYPES / FC_NS_BPW]; /* bitmap of FC-4 types */
+};
+
+/*
+ * GID_PT request.
+ */
+struct fc_ns_gid_pt {
+ __u8 fn_pt_type;
+ __u8 fn_domain_id_scope;
+ __u8 fn_area_id_scope;
+ __u8 fn_resvd;
+};
+
+/*
+ * GID_FT or GPN_FT request.
+ */
+struct fc_ns_gid_ft {
+ __u8 fn_resvd;
+ __u8 fn_domain_id_scope;
+ __u8 fn_area_id_scope;
+ __u8 fn_fc4_type;
+};
+
+/*
+ * GPN_FT response.
+ */
+struct fc_gpn_ft_resp {
+ __u8 fp_flags; /* see fp_flags definitions above */
+ __u8 fp_fid[3]; /* port ID */
+ __be32 fp_resvd;
+ __be64 fp_wwpn; /* port name */
+};
+
+/*
+ * GID_PN request
+ */
+struct fc_ns_gid_pn {
+ __be64 fn_wwpn; /* port name */
+};
+
+/*
+ * GID_PN response
+ */
+struct fc_gid_pn_resp {
+ __u8 fp_resvd;
+ __u8 fp_fid[3]; /* port ID */
+};
+
+/*
+ * RFT_ID request - register FC-4 types for ID.
+ */
+struct fc_ns_rft_id {
+ struct fc_ns_fid fr_fid; /* port ID object */
+ struct fc_ns_fts fr_fts; /* FC-4 types object */
+};
+
+/*
+ * RPN_ID request - register port name for ID.
+ * RNN_ID request - register node name for ID.
+ */
+struct fc_ns_rn_id {
+ struct fc_ns_fid fr_fid; /* port ID object */
+ __be64 fr_wwn; /* node name or port name */
+} __attribute__((__packed__));
+
+#endif /* _FC_NS_H_ */
diff --git a/include/scsi/libfc/fc_frame.h b/include/scsi/libfc/fc_frame.h
new file mode 100644
index 0000000..9508e55
--- /dev/null
+++ b/include/scsi/libfc/fc_frame.h
@@ -0,0 +1,238 @@
+/*
+ * Copyright(c) 2007 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Maintained at www.Open-FCoE.org
+ */
+
+#ifndef _FC_FRAME_H_
+#define _FC_FRAME_H_
+
+#include <linux/scatterlist.h>
+#include <linux/skbuff.h>
+
+#include <scsi/fc/fc_fs.h>
+#include <scsi/fc/fc_encaps.h>
+
+/*
+ * The fc_frame interface is used to pass frame data between functions.
+ * The frame includes the data buffer, length, and SOF / EOF delimiter types.
+ * A pointer to the port structure of the receiving port is also includeded.
+ */
+
+#define FC_FRAME_HEADROOM 32 /* headroom for VLAN + FCoE headers */
+#define FC_FRAME_TAILROOM 8 /* trailer space for FCoE */
+
+/*
+ * Information about an individual fibre channel frame received or to be sent.
+ * The buffer may be in up to 4 additional non-contiguous sections,
+ * but the linear section must hold the frame header.
+ */
+#define FC_FRAME_SG_LEN 4 /* scatter/gather list maximum length */
+
+#define fp_skb(fp) (&((fp)->skb))
+#define fr_hdr(fp) ((fp)->skb.data)
+#define fr_len(fp) ((fp)->skb.len)
+#define fr_cb(fp) ((struct fcoe_rcv_info *)&((fp)->skb.cb[0]))
+#define fr_dev(fp) (fr_cb(fp)->fr_dev)
+#define fr_seq(fp) (fr_cb(fp)->fr_seq)
+#define fr_sof(fp) (fr_cb(fp)->fr_sof)
+#define fr_eof(fp) (fr_cb(fp)->fr_eof)
+#define fr_flags(fp) (fr_cb(fp)->fr_flags)
+#define fr_max_payload(fp) (fr_cb(fp)->fr_max_payload)
+
+struct fc_frame {
+ struct sk_buff skb;
+};
+
+struct fcoe_rcv_info {
+ struct packet_type *ptype;
+ struct fc_lport *fr_dev; /* transport layer private pointer */
+ struct fc_seq *fr_seq; /* for use with exchange manager */
+ enum fc_sof fr_sof; /* start of frame delimiter */
+ enum fc_eof fr_eof; /* end of frame delimiter */
+ u8 fr_flags; /* flags - see below */
+ u16 fr_max_payload; /* max FC payload */
+};
+
+/*
+ * Get fc_frame pointer for an skb that's already been imported.
+ */
+static inline struct fcoe_rcv_info *fcoe_dev_from_skb(const struct sk_buff *skb)
+{
+ BUILD_BUG_ON(sizeof(struct fcoe_rcv_info) > sizeof(skb->cb));
+ return (struct fcoe_rcv_info *) skb->cb;
+}
+
+/*
+ * fr_flags.
+ */
+#define FCPHF_CRC_UNCHECKED 0x01 /* CRC not computed, still appended */
+
+/*
+ * Initialize a frame.
+ * We don't do a complete memset here for performance reasons.
+ * The caller must set fr_free, fr_hdr, fr_len, fr_sof, and fr_eof eventually.
+ */
+static inline void fc_frame_init(struct fc_frame *fp)
+{
+ fr_dev(fp) = NULL;
+ fr_seq(fp) = NULL;
+ fr_flags(fp) = 0;
+}
+
+struct fc_frame *fc_frame_alloc_fill(struct fc_lport *, size_t payload_len);
+
+struct fc_frame *__fc_frame_alloc(size_t payload_len);
+
+/*
+ * Get frame for sending via port.
+ */
+static inline struct fc_frame *_fc_frame_alloc(struct fc_lport *dev,
+ size_t payload_len)
+{
+ return __fc_frame_alloc(payload_len);
+}
+
+/*
+ * Allocate fc_frame structure and buffer. Set the initial length to
+ * payload_size + sizeof (struct fc_frame_header).
+ */
+static inline struct fc_frame *fc_frame_alloc(struct fc_lport *dev, size_t len)
+{
+ struct fc_frame *fp;
+
+ /*
+ * Note: Since len will often be a constant multiple of 4,
+ * this check will usually be evaluated and eliminated at compile time.
+ */
+ if ((len % 4) != 0)
+ fp = fc_frame_alloc_fill(dev, len);
+ else
+ fp = _fc_frame_alloc(dev, len);
+ return fp;
+}
+
+/*
+ * Free the fc_frame structure and buffer.
+ */
+static inline void fc_frame_free(struct fc_frame *fp)
+{
+ kfree_skb(fp_skb(fp));
+}
+
+static inline int fc_frame_is_linear(struct fc_frame *fp)
+{
+ return !skb_is_nonlinear(fp_skb(fp));
+}
+
+/*
+ * Get frame header from message in fc_frame structure.
+ * This hides a cast and provides a place to add some checking.
+ */
+static inline
+struct fc_frame_header *fc_frame_header_get(const struct fc_frame *fp)
+{
+ WARN_ON(fr_len(fp) < sizeof(struct fc_frame_header));
+ return (struct fc_frame_header *) fr_hdr(fp);
+}
+
+/*
+ * Get frame payload from message in fc_frame structure.
+ * This hides a cast and provides a place to add some checking.
+ * The len parameter is the minimum length for the payload portion.
+ * Returns NULL if the frame is too short.
+ *
+ * This assumes the interesting part of the payload is in the first part
+ * of the buffer for received data. This may not be appropriate to use for
+ * buffers being transmitted.
+ */
+static inline void *fc_frame_payload_get(const struct fc_frame *fp,
+ size_t len)
+{
+ void *pp = NULL;
+
+ if (fr_len(fp) >= sizeof(struct fc_frame_header) + len)
+ pp = fc_frame_header_get(fp) + 1;
+ return pp;
+}
+
+/*
+ * Get frame payload opcode (first byte) from message in fc_frame structure.
+ * This hides a cast and provides a place to add some checking. Return 0
+ * if the frame has no payload.
+ */
+static inline u8 fc_frame_payload_op(const struct fc_frame *fp)
+{
+ u8 *cp;
+
+ cp = fc_frame_payload_get(fp, sizeof(u8));
+ if (!cp)
+ return 0;
+ return *cp;
+
+}
+
+/*
+ * Get FC class from frame.
+ */
+static inline enum fc_class fc_frame_class(const struct fc_frame *fp)
+{
+ return fc_sof_class(fr_sof(fp));
+}
+
+/*
+ * Set r_ctl and type in preparation for sending frame.
+ * This also clears fh_parm_offset.
+ */
+static inline void fc_frame_setup(struct fc_frame *fp, enum fc_rctl r_ctl,
+ enum fc_fh_type type)
+{
+ struct fc_frame_header *fh;
+
+ fh = fc_frame_header_get(fp);
+ WARN_ON(r_ctl == 0);
+ fh->fh_r_ctl = r_ctl;
+ fh->fh_type = type;
+ fh->fh_parm_offset = htonl(0);
+}
+
+/*
+ * Set offset in preparation for sending frame.
+ */
+static inline void
+fc_frame_set_offset(struct fc_frame *fp, u32 offset)
+{
+ struct fc_frame_header *fh;
+
+ fh = fc_frame_header_get(fp);
+ fh->fh_parm_offset = htonl(offset);
+}
+
+/*
+ * Check the CRC in a frame.
+ * The CRC immediately follows the last data item *AFTER* the length.
+ * The return value is zero if the CRC matches.
+ */
+u32 fc_frame_crc_check(struct fc_frame *);
+
+/*
+ * Check for leaks.
+ * Print the frame header of any currently allocated frame, assuming there
+ * should be none at this point.
+ */
+void fc_frame_leak_check(void);
+
+#endif /* _FC_FRAME_H_ */
diff --git a/include/scsi/libfc/libfc.h b/include/scsi/libfc/libfc.h
new file mode 100644
index 0000000..26700cb
--- /dev/null
+++ b/include/scsi/libfc/libfc.h
@@ -0,0 +1,781 @@
+/*
+ * Copyright(c) 2007 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Maintained at www.Open-FCoE.org
+ */
+
+#ifndef _LIBFC_H_
+#define _LIBFC_H_
+
+#include <linux/timer.h>
+#include <linux/if.h>
+
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_transport.h>
+#include <scsi/scsi_transport_fc.h>
+
+#include <scsi/fc/fc_fcp.h>
+#include <scsi/fc/fc_ns.h>
+#include <scsi/fc/fc_els.h>
+#include <scsi/fc/fc_gs.h>
+
+#include <scsi/libfc/fc_frame.h>
+
+#define LIBFC_DEBUG
+
+#ifdef LIBFC_DEBUG
+/* Log messages */
+#define FC_DBG(fmt, args...) \
+ do { \
+ printk(KERN_INFO "%s " fmt, __func__, ##args); \
+ } while (0)
+#else
+#define FC_DBG(fmt, args...)
+#endif
+
+/*
+ * libfc error codes
+ */
+#define FC_NO_ERR 0 /* no error */
+#define FC_EX_TIMEOUT 1 /* Exchange timeout */
+#define FC_EX_CLOSED 2 /* Exchange closed */
+
+/* some helpful macros */
+
+#define ntohll(x) be64_to_cpu(x)
+#define htonll(x) cpu_to_be64(x)
+
+#define ntoh24(p) (((p)[0] << 16) | ((p)[1] << 8) | ((p)[2]))
+
+#define hton24(p, v) do { \
+ p[0] = (((v) >> 16) & 0xFF); \
+ p[1] = (((v) >> 8) & 0xFF); \
+ p[2] = ((v) & 0xFF); \
+ } while (0)
+
+struct fc_exch_mgr;
+
+/*
+ * FC HBA status
+ */
+#define FC_PAUSE (1 << 1)
+#define FC_LINK_UP (1 << 0)
+
+enum fc_lport_state {
+ LPORT_ST_NONE = 0,
+ LPORT_ST_FLOGI,
+ LPORT_ST_DNS,
+ LPORT_ST_RPN_ID,
+ LPORT_ST_RFT_ID,
+ LPORT_ST_SCR,
+ LPORT_ST_READY,
+ LPORT_ST_LOGO,
+ LPORT_ST_RESET
+};
+
+enum fc_lport_event {
+ LPORT_EV_RPORT_NONE = 0,
+ LPORT_EV_RPORT_CREATED,
+ LPORT_EV_RPORT_FAILED,
+ LPORT_EV_RPORT_STOP,
+ LPORT_EV_RPORT_LOGO
+};
+
+enum fc_rport_state {
+ RPORT_ST_NONE = 0,
+ RPORT_ST_INIT, /* initialized */
+ RPORT_ST_PLOGI, /* waiting for PLOGI completion */
+ RPORT_ST_PRLI, /* waiting for PRLI completion */
+ RPORT_ST_RTV, /* waiting for RTV completion */
+ RPORT_ST_READY, /* ready for use */
+ RPORT_ST_LOGO, /* port logout sent */
+};
+
+enum fc_rport_trans_state {
+ FC_PORTSTATE_ROGUE,
+ FC_PORTSTATE_REAL,
+};
+
+/**
+ * struct fc_disc_port - temporary discovery port to hold rport identifiers
+ * @lp: Fibre Channel host port instance
+ * @peers: node for list management during discovery and RSCN processing
+ * @ids: identifiers structure to pass to fc_remote_port_add()
+ * @rport_work: work struct for starting the rport state machine
+ */
+struct fc_disc_port {
+ struct fc_lport *lp;
+ struct list_head peers;
+ struct fc_rport_identifiers ids;
+ struct work_struct rport_work;
+};
+
+/**
+ * struct fc_rport_libfc_priv - libfc internal information about a remote port
+ * @local_port: Fibre Channel host port instance
+ * @rp_state: state tracks progress of PLOGI, PRLI, and RTV exchanges
+ * @flags: REC and RETRY supported flags
+ * @max_seq: maximum number of concurrent sequences
+ * @retries: retry count in current state
+ * @e_d_tov: error detect timeout value (in msec)
+ * @r_a_tov: resource allocation timeout value (in msec)
+ * @rp_mutex: mutex protects rport
+ * @retry_work:
+ * @event_callback: Callback for rport READY, FAILED or LOGO
+ */
+struct fc_rport_libfc_priv {
+ struct fc_lport *local_port;
+ enum fc_rport_state rp_state;
+ u16 flags;
+ #define FC_RP_FLAGS_REC_SUPPORTED (1 << 0)
+ #define FC_RP_FLAGS_RETRY (1 << 1)
+ u16 max_seq;
+ unsigned int retries;
+ unsigned int e_d_tov;
+ unsigned int r_a_tov;
+ enum fc_rport_trans_state trans_state;
+ struct mutex rp_mutex;
+ struct work_struct retry_work;
+ enum fc_lport_event event;
+ void (*event_callback)(struct fc_lport *,
+ struct fc_rport *,
+ enum fc_lport_event);
+ struct list_head peers;
+ struct work_struct event_work;
+};
+
+#define PRIV_TO_RPORT(x) \
+ (struct fc_rport*)((void *)x - sizeof(struct fc_rport));
+#define RPORT_TO_PRIV(x) \
+ (struct fc_rport_libfc_priv*)((void *)x + sizeof(struct fc_rport));
+
+struct fc_rport *fc_rport_rogue_create(struct fc_disc_port *);
+void fc_rport_rogue_destroy(struct fc_rport *);
+
+static inline void fc_rport_set_name(struct fc_rport *rport, u64 wwpn, u64 wwnn)
+{
+ rport->node_name = wwnn;
+ rport->port_name = wwpn;
+}
+
+/*
+ * fcoe stats structure
+ */
+struct fcoe_dev_stats {
+ u64 SecondsSinceLastReset;
+ u64 TxFrames;
+ u64 TxWords;
+ u64 RxFrames;
+ u64 RxWords;
+ u64 ErrorFrames;
+ u64 DumpedFrames;
+ u64 LinkFailureCount;
+ u64 LossOfSignalCount;
+ u64 InvalidTxWordCount;
+ u64 InvalidCRCCount;
+ u64 InputRequests;
+ u64 OutputRequests;
+ u64 ControlRequests;
+ u64 InputMegabytes;
+ u64 OutputMegabytes;
+};
+
+/*
+ * els data is used for passing ELS respone specific
+ * data to send ELS response mainly using infomation
+ * in exchange and sequence in EM layer.
+ */
+struct fc_seq_els_data {
+ struct fc_frame *fp;
+ enum fc_els_rjt_reason reason;
+ enum fc_els_rjt_explan explan;
+};
+
+struct libfc_function_template {
+
+ /**
+ * Mandatory Fields
+ *
+ * These handlers must be implemented by the LLD.
+ */
+
+ /*
+ * Interface to send a FC frame
+ */
+ int (*frame_send)(struct fc_lport *lp, struct fc_frame *fp);
+
+ /**
+ * Optional Fields
+ *
+ * The LLD may choose to implement any of the following handlers.
+ * If LLD doesn't specify hander and leaves its pointer NULL then
+ * the default libfc function will be used for that handler.
+ */
+
+ /**
+ * Exhance Manager interfaces
+ */
+
+ /*
+ * Send the FC frame payload using a new exchange and sequence.
+ *
+ * The frame pointer with some of the header's fields must be
+ * filled before calling exch_seq_send(), those fields are,
+ *
+ * - routing control
+ * - FC header type
+ * - parameter or relative offset
+ *
+ * The exchange response handler is set in this routine to resp()
+ * function pointer. It can be called in two scenarios: if a timeout
+ * occurs or if a response frame is received for the exchange. The
+ * fc_frame pointer in response handler will also indicate timeout
+ * as error using IS_ERR related macros.
+ *
+ * The exchange destructor handler is also set in this routine.
+ * The destructor handler is invoked by EM layer when exchange
+ * is about to free, this can be used by caller to free its
+ * resources along with exchange free.
+ *
+ * The arg is passed back to resp and destructor handler.
+ *
+ * The timeout value (in msec) for an exchange is set if non zero
+ * timer_msec argument is specified. The timer is canceled when
+ * it fires or when the exchange is done. The exchange timeout handler
+ * is registered by EM layer.
+ *
+ * The caller also need to specify FC sid, did and frame control field.
+ */
+ struct fc_seq *(*exch_seq_send)(struct fc_lport *lp,
+ struct fc_frame *fp,
+ void (*resp)(struct fc_seq *sp,
+ struct fc_frame *fp,
+ void *arg),
+ void (*destructor)(struct fc_seq *sp,
+ void *arg),
+ void *arg, unsigned int timer_msec,
+ u32 sid, u32 did, u32 f_ctl);
+
+ /*
+ * send a frame using existing sequence and exchange.
+ */
+ int (*seq_send)(struct fc_lport *lp, struct fc_seq *sp,
+ struct fc_frame *fp, u32 f_ctl);
+
+ /*
+ * Send ELS response using mainly infomation
+ * in exchange and sequence in EM layer.
+ */
+ void (*seq_els_rsp_send)(struct fc_seq *sp, enum fc_els_cmd els_cmd,
+ struct fc_seq_els_data *els_data);
+
+ /*
+ * Abort an exchange and sequence. Generally called because of a
+ * exchange timeout or an abort from the upper layer.
+ *
+ * A timer_msec can be specified for abort timeout, if non-zero
+ * timer_msec value is specified then exchange resp handler
+ * will be called with timeout error if no response to abort.
+ */
+ int (*seq_exch_abort)(const struct fc_seq *req_sp,
+ unsigned int timer_msec);
+
+ /*
+ * Indicate that an exchange/sequence tuple is complete and the memory
+ * allocated for the related objects may be freed.
+ */
+ void (*exch_done)(struct fc_seq *sp);
+
+ /*
+ * Assigns a EM and a free XID for an new exchange and then
+ * allocates a new exchange and sequence pair.
+ * The fp can be used to determine free XID.
+ */
+ struct fc_exch *(*exch_get)(struct fc_lport *lp, struct fc_frame *fp);
+
+ /*
+ * Release previously assigned XID by exch_get API.
+ * The LLD may implement this if XID is assigned by LLD
+ * in exch_get().
+ */
+ void (*exch_put)(struct fc_lport *lp, struct fc_exch_mgr *mp,
+ u16 ex_id);
+
+ /*
+ * Start a new sequence on the same exchange/sequence tuple.
+ */
+ struct fc_seq *(*seq_start_next)(struct fc_seq *sp);
+
+ /*
+ * Reset an exchange manager, completing all sequences and exchanges.
+ * If s_id is non-zero, reset only exchanges originating from that FID.
+ * If d_id is non-zero, reset only exchanges sending to that FID.
+ */
+ void (*exch_mgr_reset)(struct fc_exch_mgr *,
+ u32 s_id, u32 d_id);
+
+ /*
+ * Get exchange Ids of a sequence
+ */
+ void (*seq_get_xids)(struct fc_seq *sp, u16 *oxid, u16 *rxid);
+
+ /*
+ * Set REC data to a sequence
+ */
+ void (*seq_set_rec_data)(struct fc_seq *sp, u32 rec_data);
+
+ /**
+ * Local Port interfaces
+ */
+
+ /*
+ * Receive a frame to a local port.
+ */
+ void (*lport_recv)(struct fc_lport *lp, struct fc_seq *sp,
+ struct fc_frame *fp);
+
+ int (*lport_reset)(struct fc_lport *);
+
+ void (*event_callback)(struct fc_lport *, struct fc_rport *,
+ enum fc_lport_event);
+
+ /**
+ * Remote Port interfaces
+ */
+
+ /*
+ * Initiates the RP state machine. It is called from the LP module.
+ * This function will issue the following commands to the N_Port
+ * identified by the FC ID provided.
+ *
+ * - PLOGI
+ * - PRLI
+ * - RTV
+ */
+ int (*rport_login)(struct fc_rport *rport);
+
+ /*
+ * Logs the specified local port out of a N_Port identified
+ * by the ID provided.
+ */
+ int (*rport_logout)(struct fc_rport *rport);
+
+ /*
+ * Delete the rport and remove it from the transport if
+ * it had been added. This will not send a LOGO, use
+ * rport_logout for a gracefull logout.
+ */
+ int (*rport_stop)(struct fc_rport *rport);
+
+ /*
+ * Recieve a request from a remote port.
+ */
+ void (*rport_recv_req)(struct fc_seq *, struct fc_frame *,
+ struct fc_rport *);
+
+ struct fc_rport *(*rport_lookup)(const struct fc_lport *, u32);
+
+ /**
+ * SCSI interfaces
+ */
+
+ /*
+ * Used at least durring linkdown and reset
+ */
+ void (*scsi_cleanup)(struct fc_lport *);
+
+ /*
+ * Abort all I/O on a local port
+ */
+ void (*scsi_abort_io)(struct fc_lport *);
+
+ /**
+ * Discovery interfaces
+ */
+
+ void (*disc_recv_req)(struct fc_seq *,
+ struct fc_frame *, struct fc_lport *);
+
+ /*
+ * Start discovery for a local port.
+ */
+ int (*disc_start)(struct fc_lport *);
+};
+
+struct fc_lport {
+ struct list_head list;
+
+ /* Associations */
+ struct Scsi_Host *host;
+ struct fc_exch_mgr *emp;
+ struct fc_rport *dns_rp;
+ struct fc_rport *ptp_rp;
+ void *scsi_priv;
+ struct list_head rports;
+
+ /* Operational Information */
+ struct libfc_function_template tt;
+ u16 link_status;
+ u8 disc_done;
+ enum fc_lport_state state;
+ unsigned long boot_time;
+
+ struct fc_host_statistics host_stats;
+ struct fcoe_dev_stats *dev_stats[NR_CPUS];
+
+ u64 wwpn;
+ u64 wwnn;
+ u8 retry_count;
+ unsigned char disc_retry_count;
+ unsigned char disc_delay;
+ unsigned char disc_pending;
+ unsigned char disc_requested;
+ unsigned short disc_seq_count;
+ unsigned char disc_buf_len;
+
+ /* Capabilities */
+ u32 sg_supp:1; /* scatter gather supported */
+ u32 seq_offload:1; /* seq offload supported */
+ u32 mfs; /* max FC payload size */
+ unsigned int service_params;
+ unsigned int e_d_tov;
+ unsigned int r_a_tov;
+ u8 max_retry_count;
+ u16 link_speed;
+ u16 link_supported_speeds;
+ struct fc_ns_fts fcts; /* FC-4 type masks */
+ struct fc_els_rnid_gen rnid_gen; /* RNID information */
+
+ /* Semaphores */
+ struct mutex lp_mutex;
+
+ /* Miscellaneous */
+ struct fc_gpn_ft_resp disc_buf; /* partial name buffer */
+ struct work_struct retry_work;
+ struct work_struct disc_work;
+
+ void *drv_priv;
+};
+
+/**
+ * FC_LPORT HELPER FUNCTIONS
+ *****************************/
+
+static inline int fc_lport_test_ready(struct fc_lport *lp)
+{
+ return lp->state == LPORT_ST_READY;
+}
+
+static inline void fc_set_wwnn(struct fc_lport *lp, u64 wwnn)
+{
+ lp->wwnn = wwnn;
+}
+
+static inline void fc_set_wwpn(struct fc_lport *lp, u64 wwnn)
+{
+ lp->wwpn = wwnn;
+}
+
+/**
+ * fc_fill_dns_hdr - Fill in a name service request header
+ * @lp: Fibre Channel host port instance
+ * @ct: Common Transport (CT) header structure
+ * @op: Name Service request code
+ * @req_size: Full size of Name Service request
+ */
+static inline void fc_fill_dns_hdr(struct fc_lport *lp, struct fc_ct_hdr *ct,
+ unsigned int op, unsigned int req_size)
+{
+ memset(ct, 0, sizeof(*ct) + req_size);
+ ct->ct_rev = FC_CT_REV;
+ ct->ct_fs_type = FC_FST_DIR;
+ ct->ct_fs_subtype = FC_NS_SUBTYPE;
+ ct->ct_cmd = htons((u16) op);
+}
+
+static inline void fc_lport_state_enter(struct fc_lport *lp,
+ enum fc_lport_state state)
+{
+ if (state != lp->state)
+ lp->retry_count = 0;
+ lp->state = state;
+}
+
+
+/**
+ * LOCAL PORT LAYER
+ *****************************/
+int fc_lport_init(struct fc_lport *lp);
+
+/*
+ * Destroy the specified local port by finding and freeing all
+ * fc_rports associated with it and then by freeing the fc_lport
+ * itself.
+ */
+int fc_lport_destroy(struct fc_lport *lp);
+
+/*
+ * Logout the specified local port from the fabric
+ */
+int fc_fabric_logoff(struct fc_lport *lp);
+
+/*
+ * Initiate the LP state machine. This handler will use fc_host_attr
+ * to store the FLOGI service parameters, so fc_host_attr must be
+ * initialized before calling this handler.
+ */
+int fc_fabric_login(struct fc_lport *lp);
+
+/*
+ * The link is up for the given local port.
+ */
+void fc_linkup(struct fc_lport *);
+
+/*
+ * Link is down for the given local port.
+ */
+void fc_linkdown(struct fc_lport *);
+
+/*
+ * Pause and unpause traffic.
+ */
+void fc_pause(struct fc_lport *);
+void fc_unpause(struct fc_lport *);
+
+/*
+ * Configure the local port.
+ */
+int fc_lport_config(struct fc_lport *);
+
+/*
+ * Reset the local port.
+ */
+int fc_lport_reset(struct fc_lport *);
+
+/*
+ * Set the mfs or reset
+ */
+int fc_set_mfs(struct fc_lport *lp, u32 mfs);
+
+
+/**
+ * REMOTE PORT LAYER
+ *****************************/
+int fc_rport_init(struct fc_lport *lp);
+void fc_rport_terminate_io(struct fc_rport *rp);
+
+/**
+ * DISCOVERY LAYER
+ *****************************/
+int fc_disc_init(struct fc_lport *lp);
+
+
+/**
+ * SCSI LAYER
+ *****************************/
+/*
+ * Initialize the SCSI block of libfc
+ */
+int fc_fcp_init(struct fc_lport *);
+
+/*
+ * This section provides an API which allows direct interaction
+ * with the SCSI-ml. Each of these functions satisfies a function
+ * pointer defined in Scsi_Host and therefore is always called
+ * directly from the SCSI-ml.
+ */
+int fc_queuecommand(struct scsi_cmnd *sc_cmd,
+ void (*done)(struct scsi_cmnd *));
+
+/*
+ * Send an ABTS frame to the target device. The sc_cmd argument
+ * is a pointer to the SCSI command to be aborted.
+ */
+int fc_eh_abort(struct scsi_cmnd *sc_cmd);
+
+/*
+ * Reset a LUN by sending send the tm cmd to the target.
+ */
+int fc_eh_device_reset(struct scsi_cmnd *sc_cmd);
+
+/*
+ * Reset the host adapter.
+ */
+int fc_eh_host_reset(struct scsi_cmnd *sc_cmd);
+
+/*
+ * Check rport status.
+ */
+int fc_slave_alloc(struct scsi_device *sdev);
+
+/*
+ * Adjust the queue depth.
+ */
+int fc_change_queue_depth(struct scsi_device *sdev, int qdepth);
+
+/*
+ * Change the tag type.
+ */
+int fc_change_queue_type(struct scsi_device *sdev, int tag_type);
+
+/*
+ * Free memory pools used by the FCP layer.
+ */
+void fc_fcp_destroy(struct fc_lport *);
+
+
+/**
+ * EXCHANGE MANAGER LAYER
+ *****************************/
+/*
+ * Initializes Exchange Manager related
+ * function pointers in struct libfc_function_template.
+ */
+int fc_exch_init(struct fc_lport *lp);
+
+/*
+ * Allocates an Exchange Manager (EM).
+ *
+ * The EM manages exchanges for their allocation and
+ * free, also allows exchange lookup for received
+ * frame.
+ *
+ * The class is used for initializing FC class of
+ * allocated exchange from EM.
+ *
+ * The min_xid and max_xid will limit new
+ * exchange ID (XID) within this range for
+ * a new exchange.
+ * The LLD may choose to have multiple EMs,
+ * e.g. one EM instance per CPU receive thread in LLD.
+ * The LLD can use exch_get() of struct libfc_function_template
+ * to specify XID for a new exchange within
+ * a specified EM instance.
+ *
+ * The em_idx to uniquely identify an EM instance.
+ */
+struct fc_exch_mgr *fc_exch_mgr_alloc(struct fc_lport *lp,
+ enum fc_class class,
+ u16 min_xid,
+ u16 max_xid);
+
+/*
+ * Free an exchange manager.
+ */
+void fc_exch_mgr_free(struct fc_exch_mgr *mp);
+
+/*
+ * Receive a frame on specified local port and exchange manager.
+ */
+void fc_exch_recv(struct fc_lport *lp, struct fc_exch_mgr *mp,
+ struct fc_frame *fp);
+
+/*
+ * This function is for exch_seq_send function pointer in
+ * struct libfc_function_template, see comment block on
+ * exch_seq_send for description of this function.
+ */
+struct fc_seq *fc_exch_seq_send(struct fc_lport *lp,
+ struct fc_frame *fp,
+ void (*resp)(struct fc_seq *sp,
+ struct fc_frame *fp,
+ void *arg),
+ void (*destructor)(struct fc_seq *sp,
+ void *arg),
+ void *arg, u32 timer_msec,
+ u32 sid, u32 did, u32 f_ctl);
+
+/*
+ * send a frame using existing sequence and exchange.
+ */
+int fc_seq_send(struct fc_lport *lp, struct fc_seq *sp,
+ struct fc_frame *fp, u32 f_ctl);
+
+/*
+ * Send ELS response using mainly infomation
+ * in exchange and sequence in EM layer.
+ */
+void fc_seq_els_rsp_send(struct fc_seq *sp, enum fc_els_cmd els_cmd,
+ struct fc_seq_els_data *els_data);
+
+/*
+ * This function is for seq_exch_abort function pointer in
+ * struct libfc_function_template, see comment block on
+ * seq_exch_abort for description of this function.
+ */
+int fc_seq_exch_abort(const struct fc_seq *req_sp, unsigned int timer_msec);
+
+/*
+ * Indicate that an exchange/sequence tuple is complete and the memory
+ * allocated for the related objects may be freed.
+ */
+void fc_exch_done(struct fc_seq *sp);
+
+/*
+ * Assigns a EM and XID for a frame and then allocates
+ * a new exchange and sequence pair.
+ * The fp can be used to determine free XID.
+ */
+struct fc_exch *fc_exch_get(struct fc_lport *lp, struct fc_frame *fp);
+
+/*
+ * Allocate a new exchange and sequence pair.
+ * if ex_id is zero then next free exchange id
+ * from specified exchange manger mp will be assigned.
+ */
+struct fc_exch *fc_exch_alloc(struct fc_exch_mgr *mp, u16 ex_id);
+
+/*
+ * Start a new sequence on the same exchange as the supplied sequence.
+ */
+struct fc_seq *fc_seq_start_next(struct fc_seq *sp);
+
+/*
+ * Reset an exchange manager, completing all sequences and exchanges.
+ * If s_id is non-zero, reset only exchanges originating from that FID.
+ * If d_id is non-zero, reset only exchanges sending to that FID.
+ */
+void fc_exch_mgr_reset(struct fc_exch_mgr *, u32 s_id, u32 d_id);
+
+/*
+ * Get exchange Ids of a sequence
+ */
+void fc_seq_get_xids(struct fc_seq *sp, u16 *oxid, u16 *rxid);
+
+/*
+ * Set REC data to a sequence
+ */
+void fc_seq_set_rec_data(struct fc_seq *sp, u32 rec_data);
+
+/*
+ * Functions for fc_functions_template
+ */
+void fc_get_host_speed(struct Scsi_Host *shost);
+void fc_get_host_port_type(struct Scsi_Host *shost);
+void fc_get_host_port_state(struct Scsi_Host *shost);
+void fc_set_rport_loss_tmo(struct fc_rport *rport, u32 timeout);
+struct fc_host_statistics *fc_get_host_stats(struct Scsi_Host *);
+
+/*
+ * module setup functions.
+ */
+int fc_setup_exch_mgr(void);
+void fc_destroy_exch_mgr(void);
+int fc_setup_rport(void);
+void fc_destroy_rport(void);
+
+#endif /* _LIBFC_H_ */
distrib
>
Scientific%20Linux
>
5x
>
x86_64
>
by-pkgid
>
fc11cd6e1c513a17304da94a5390f3cd
>
files
>
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