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scsi_transport_fc.c

/*
 *  FiberChannel transport specific attributes exported to sysfs.
 *
 *  Copyright (c) 2003 Silicon Graphics, Inc.  All rights reserved.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *  ========
 *
 *  Copyright (C) 2004-2007   James Smart, Emulex Corporation
 *    Rewrite for host, target, device, and remote port attributes,
 *    statistics, and service functions...
 *    Add vports, etc
 *
 */
#include <linux/module.h>
#include <linux/init.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_transport.h>
#include <scsi/scsi_transport_fc.h>
#include <scsi/scsi_cmnd.h>
#include <linux/netlink.h>
#include <net/netlink.h>
#include <scsi/scsi_netlink_fc.h>
#include <scsi/scsi_bsg_fc.h>
#include "scsi_priv.h"
#include "scsi_transport_fc_internal.h"

static int fc_queue_work(struct Scsi_Host *, struct work_struct *);
static void fc_vport_sched_delete(struct work_struct *work);
static int fc_vport_setup(struct Scsi_Host *shost, int channel,
      struct device *pdev, struct fc_vport_identifiers  *ids,
      struct fc_vport **vport);
static int fc_bsg_hostadd(struct Scsi_Host *, struct fc_host_attrs *);
static int fc_bsg_rportadd(struct Scsi_Host *, struct fc_rport *);
static void fc_bsg_remove(struct request_queue *);
static void fc_bsg_goose_queue(struct fc_rport *);

/*
 * Redefine so that we can have same named attributes in the
 * sdev/starget/host objects.
 */
#define FC_DEVICE_ATTR(_prefix,_name,_mode,_show,_store)          \
struct device_attribute device_attr_##_prefix##_##_name =   \
      __ATTR(_name,_mode,_show,_store)

#define fc_enum_name_search(title, table_type, table)             \
static const char *get_fc_##title##_name(enum table_type table_key)     \
{                                                     \
      int i;                                                \
      char *name = NULL;                                    \
                                                      \
      for (i = 0; i < ARRAY_SIZE(table); i++) {             \
            if (table[i].value == table_key) {              \
                  name = table[i].name;                     \
                  break;                                    \
            }                                         \
      }                                               \
      return name;                                          \
}

#define fc_enum_name_match(title, table_type, table)              \
static int get_fc_##title##_match(const char *table_key,          \
            enum table_type *value)                         \
{                                                     \
      int i;                                                \
                                                      \
      for (i = 0; i < ARRAY_SIZE(table); i++) {             \
            if (strncmp(table_key, table[i].name,                 \
                        table[i].matchlen) == 0) {          \
                  *value = table[i].value;                  \
                  return 0; /* success */                   \
            }                                         \
      }                                               \
      return 1; /* failure */                               \
}


/* Convert fc_port_type values to ascii string name */
static struct {
      enum fc_port_type value;
      char              *name;
} fc_port_type_names[] = {
      { FC_PORTTYPE_UNKNOWN,        "Unknown" },
      { FC_PORTTYPE_OTHER,          "Other" },
      { FC_PORTTYPE_NOTPRESENT,     "Not Present" },
      { FC_PORTTYPE_NPORT,    "NPort (fabric via point-to-point)" },
      { FC_PORTTYPE_NLPORT,   "NLPort (fabric via loop)" },
      { FC_PORTTYPE_LPORT,    "LPort (private loop)" },
      { FC_PORTTYPE_PTP,      "Point-To-Point (direct nport connection)" },
      { FC_PORTTYPE_NPIV,           "NPIV VPORT" },
};
fc_enum_name_search(port_type, fc_port_type, fc_port_type_names)
#define FC_PORTTYPE_MAX_NAMELEN           50

/* Reuse fc_port_type enum function for vport_type */
#define get_fc_vport_type_name get_fc_port_type_name


/* Convert fc_host_event_code values to ascii string name */
static const struct {
      enum fc_host_event_code       value;
      char                    *name;
} fc_host_event_code_names[] = {
      { FCH_EVT_LIP,                "lip" },
      { FCH_EVT_LINKUP,       "link_up" },
      { FCH_EVT_LINKDOWN,           "link_down" },
      { FCH_EVT_LIPRESET,           "lip_reset" },
      { FCH_EVT_RSCN,               "rscn" },
      { FCH_EVT_ADAPTER_CHANGE,     "adapter_chg" },
      { FCH_EVT_PORT_UNKNOWN,       "port_unknown" },
      { FCH_EVT_PORT_ONLINE,        "port_online" },
      { FCH_EVT_PORT_OFFLINE,       "port_offline" },
      { FCH_EVT_PORT_FABRIC,        "port_fabric" },
      { FCH_EVT_LINK_UNKNOWN,       "link_unknown" },
      { FCH_EVT_VENDOR_UNIQUE,      "vendor_unique" },
};
fc_enum_name_search(host_event_code, fc_host_event_code,
            fc_host_event_code_names)
#define FC_HOST_EVENT_CODE_MAX_NAMELEN    30


/* Convert fc_port_state values to ascii string name */
static struct {
      enum fc_port_state      value;
      char              *name;
} fc_port_state_names[] = {
      { FC_PORTSTATE_UNKNOWN,       "Unknown" },
      { FC_PORTSTATE_NOTPRESENT,    "Not Present" },
      { FC_PORTSTATE_ONLINE,        "Online" },
      { FC_PORTSTATE_OFFLINE,       "Offline" },
      { FC_PORTSTATE_BLOCKED,       "Blocked" },
      { FC_PORTSTATE_BYPASSED,      "Bypassed" },
      { FC_PORTSTATE_DIAGNOSTICS,   "Diagnostics" },
      { FC_PORTSTATE_LINKDOWN,      "Linkdown" },
      { FC_PORTSTATE_ERROR,         "Error" },
      { FC_PORTSTATE_LOOPBACK,      "Loopback" },
      { FC_PORTSTATE_DELETED,       "Deleted" },
};
fc_enum_name_search(port_state, fc_port_state, fc_port_state_names)
#define FC_PORTSTATE_MAX_NAMELEN    20


/* Convert fc_vport_state values to ascii string name */
static struct {
      enum fc_vport_state     value;
      char              *name;
} fc_vport_state_names[] = {
      { FC_VPORT_UNKNOWN,           "Unknown" },
      { FC_VPORT_ACTIVE,            "Active" },
      { FC_VPORT_DISABLED,          "Disabled" },
      { FC_VPORT_LINKDOWN,          "Linkdown" },
      { FC_VPORT_INITIALIZING,      "Initializing" },
      { FC_VPORT_NO_FABRIC_SUPP,    "No Fabric Support" },
      { FC_VPORT_NO_FABRIC_RSCS,    "No Fabric Resources" },
      { FC_VPORT_FABRIC_LOGOUT,     "Fabric Logout" },
      { FC_VPORT_FABRIC_REJ_WWN,    "Fabric Rejected WWN" },
      { FC_VPORT_FAILED,            "VPort Failed" },
};
fc_enum_name_search(vport_state, fc_vport_state, fc_vport_state_names)
#define FC_VPORTSTATE_MAX_NAMELEN   24

/* Reuse fc_vport_state enum function for vport_last_state */
#define get_fc_vport_last_state_name get_fc_vport_state_name


/* Convert fc_tgtid_binding_type values to ascii string name */
static const struct {
      enum fc_tgtid_binding_type    value;
      char                    *name;
      int                     matchlen;
} fc_tgtid_binding_type_names[] = {
      { FC_TGTID_BIND_NONE, "none", 4 },
      { FC_TGTID_BIND_BY_WWPN, "wwpn (World Wide Port Name)", 4 },
      { FC_TGTID_BIND_BY_WWNN, "wwnn (World Wide Node Name)", 4 },
      { FC_TGTID_BIND_BY_ID, "port_id (FC Address)", 7 },
};
fc_enum_name_search(tgtid_bind_type, fc_tgtid_binding_type,
            fc_tgtid_binding_type_names)
fc_enum_name_match(tgtid_bind_type, fc_tgtid_binding_type,
            fc_tgtid_binding_type_names)
#define FC_BINDTYPE_MAX_NAMELEN     30


#define fc_bitfield_name_search(title, table)               \
static ssize_t                                        \
get_fc_##title##_names(u32 table_key, char *buf)            \
{                                               \
      char *prefix = "";                              \
      ssize_t len = 0;                          \
      int i;                                          \
                                                \
      for (i = 0; i < ARRAY_SIZE(table); i++) {       \
            if (table[i].value & table_key) {         \
                  len += sprintf(buf + len, "%s%s",   \
                        prefix, table[i].name);       \
                  prefix = ", ";                      \
            }                                   \
      }                                         \
      len += sprintf(buf + len, "\n");                \
      return len;                               \
}


/* Convert FC_COS bit values to ascii string name */
static const struct {
      u32               value;
      char              *name;
} fc_cos_names[] = {
      { FC_COS_CLASS1,  "Class 1" },
      { FC_COS_CLASS2,  "Class 2" },
      { FC_COS_CLASS3,  "Class 3" },
      { FC_COS_CLASS4,  "Class 4" },
      { FC_COS_CLASS6,  "Class 6" },
};
fc_bitfield_name_search(cos, fc_cos_names)


/* Convert FC_PORTSPEED bit values to ascii string name */
static const struct {
      u32               value;
      char              *name;
} fc_port_speed_names[] = {
      { FC_PORTSPEED_1GBIT,         "1 Gbit" },
      { FC_PORTSPEED_2GBIT,         "2 Gbit" },
      { FC_PORTSPEED_4GBIT,         "4 Gbit" },
      { FC_PORTSPEED_10GBIT,        "10 Gbit" },
      { FC_PORTSPEED_8GBIT,         "8 Gbit" },
      { FC_PORTSPEED_16GBIT,        "16 Gbit" },
      { FC_PORTSPEED_NOT_NEGOTIATED,      "Not Negotiated" },
};
fc_bitfield_name_search(port_speed, fc_port_speed_names)


static int
show_fc_fc4s (char *buf, u8 *fc4_list)
{
      int i, len=0;

      for (i = 0; i < FC_FC4_LIST_SIZE; i++, fc4_list++)
            len += sprintf(buf + len , "0x%02x ", *fc4_list);
      len += sprintf(buf + len, "\n");
      return len;
}


/* Convert FC_PORT_ROLE bit values to ascii string name */
static const struct {
      u32               value;
      char              *name;
} fc_port_role_names[] = {
      { FC_PORT_ROLE_FCP_TARGET,    "FCP Target" },
      { FC_PORT_ROLE_FCP_INITIATOR, "FCP Initiator" },
      { FC_PORT_ROLE_IP_PORT,       "IP Port" },
};
fc_bitfield_name_search(port_roles, fc_port_role_names)

/*
 * Define roles that are specific to port_id. Values are relative to ROLE_MASK.
 */
#define FC_WELLKNOWN_PORTID_MASK    0xfffff0
#define FC_WELLKNOWN_ROLE_MASK      0x00000f
#define FC_FPORT_PORTID             0x00000e
#define FC_FABCTLR_PORTID           0x00000d
#define FC_DIRSRVR_PORTID           0x00000c
#define FC_TIMESRVR_PORTID          0x00000b
#define FC_MGMTSRVR_PORTID          0x00000a


static void fc_timeout_deleted_rport(struct work_struct *work);
static void fc_timeout_fail_rport_io(struct work_struct *work);
static void fc_scsi_scan_rport(struct work_struct *work);

/*
 * Attribute counts pre object type...
 * Increase these values if you add attributes
 */
#define FC_STARGET_NUM_ATTRS  3
#define FC_RPORT_NUM_ATTRS    10
#define FC_VPORT_NUM_ATTRS    9
#define FC_HOST_NUM_ATTRS     21

struct fc_internal {
      struct scsi_transport_template t;
      struct fc_function_template *f;

      /*
       * For attributes : each object has :
       *   An array of the actual attributes structures
       *   An array of null-terminated pointers to the attribute
       *     structures - used for mid-layer interaction.
       *
       * The attribute containers for the starget and host are are
       * part of the midlayer. As the remote port is specific to the
       * fc transport, we must provide the attribute container.
       */
      struct device_attribute private_starget_attrs[
                                          FC_STARGET_NUM_ATTRS];
      struct device_attribute *starget_attrs[FC_STARGET_NUM_ATTRS + 1];

      struct device_attribute private_host_attrs[FC_HOST_NUM_ATTRS];
      struct device_attribute *host_attrs[FC_HOST_NUM_ATTRS + 1];

      struct transport_container rport_attr_cont;
      struct device_attribute private_rport_attrs[FC_RPORT_NUM_ATTRS];
      struct device_attribute *rport_attrs[FC_RPORT_NUM_ATTRS + 1];

      struct transport_container vport_attr_cont;
      struct device_attribute private_vport_attrs[FC_VPORT_NUM_ATTRS];
      struct device_attribute *vport_attrs[FC_VPORT_NUM_ATTRS + 1];
};

#define to_fc_internal(tmpl)  container_of(tmpl, struct fc_internal, t)

static int fc_target_setup(struct transport_container *tc, struct device *dev,
                     struct device *cdev)
{
      struct scsi_target *starget = to_scsi_target(dev);
      struct fc_rport *rport = starget_to_rport(starget);

      /*
       * if parent is remote port, use values from remote port.
       * Otherwise, this host uses the fc_transport, but not the
       * remote port interface. As such, initialize to known non-values.
       */
      if (rport) {
            fc_starget_node_name(starget) = rport->node_name;
            fc_starget_port_name(starget) = rport->port_name;
            fc_starget_port_id(starget) = rport->port_id;
      } else {
            fc_starget_node_name(starget) = -1;
            fc_starget_port_name(starget) = -1;
            fc_starget_port_id(starget) = -1;
      }

      return 0;
}

static DECLARE_TRANSPORT_CLASS(fc_transport_class,
                         "fc_transport",
                         fc_target_setup,
                         NULL,
                         NULL);

static int fc_host_setup(struct transport_container *tc, struct device *dev,
                   struct device *cdev)
{
      struct Scsi_Host *shost = dev_to_shost(dev);
      struct fc_host_attrs *fc_host = shost_to_fc_host(shost);

      /*
       * Set default values easily detected by the midlayer as
       * failure cases.  The scsi lldd is responsible for initializing
       * all transport attributes to valid values per host.
       */
      fc_host->node_name = -1;
      fc_host->port_name = -1;
      fc_host->permanent_port_name = -1;
      fc_host->supported_classes = FC_COS_UNSPECIFIED;
      memset(fc_host->supported_fc4s, 0,
            sizeof(fc_host->supported_fc4s));
      fc_host->supported_speeds = FC_PORTSPEED_UNKNOWN;
      fc_host->maxframe_size = -1;
      fc_host->max_npiv_vports = 0;
      memset(fc_host->serial_number, 0,
            sizeof(fc_host->serial_number));

      fc_host->port_id = -1;
      fc_host->port_type = FC_PORTTYPE_UNKNOWN;
      fc_host->port_state = FC_PORTSTATE_UNKNOWN;
      memset(fc_host->active_fc4s, 0,
            sizeof(fc_host->active_fc4s));
      fc_host->speed = FC_PORTSPEED_UNKNOWN;
      fc_host->fabric_name = -1;
      memset(fc_host->symbolic_name, 0, sizeof(fc_host->symbolic_name));
      memset(fc_host->system_hostname, 0, sizeof(fc_host->system_hostname));

      fc_host->tgtid_bind_type = FC_TGTID_BIND_BY_WWPN;

      INIT_LIST_HEAD(&fc_host->rports);
      INIT_LIST_HEAD(&fc_host->rport_bindings);
      INIT_LIST_HEAD(&fc_host->vports);
      fc_host->next_rport_number = 0;
      fc_host->next_target_id = 0;
      fc_host->next_vport_number = 0;
      fc_host->npiv_vports_inuse = 0;

      snprintf(fc_host->work_q_name, sizeof(fc_host->work_q_name),
             "fc_wq_%d", shost->host_no);
      fc_host->work_q = create_singlethread_workqueue(
                              fc_host->work_q_name);
      if (!fc_host->work_q)
            return -ENOMEM;

      snprintf(fc_host->devloss_work_q_name,
             sizeof(fc_host->devloss_work_q_name),
             "fc_dl_%d", shost->host_no);
      fc_host->devloss_work_q = create_singlethread_workqueue(
                              fc_host->devloss_work_q_name);
      if (!fc_host->devloss_work_q) {
            destroy_workqueue(fc_host->work_q);
            fc_host->work_q = NULL;
            return -ENOMEM;
      }

      fc_bsg_hostadd(shost, fc_host);
      /* ignore any bsg add error - we just can't do sgio */

      return 0;
}

static int fc_host_remove(struct transport_container *tc, struct device *dev,
                   struct device *cdev)
{
      struct Scsi_Host *shost = dev_to_shost(dev);
      struct fc_host_attrs *fc_host = shost_to_fc_host(shost);

      fc_bsg_remove(fc_host->rqst_q);
      return 0;
}

static DECLARE_TRANSPORT_CLASS(fc_host_class,
                         "fc_host",
                         fc_host_setup,
                         fc_host_remove,
                         NULL);

/*
 * Setup and Remove actions for remote ports are handled
 * in the service functions below.
 */
static DECLARE_TRANSPORT_CLASS(fc_rport_class,
                         "fc_remote_ports",
                         NULL,
                         NULL,
                         NULL);

/*
 * Setup and Remove actions for virtual ports are handled
 * in the service functions below.
 */
static DECLARE_TRANSPORT_CLASS(fc_vport_class,
                         "fc_vports",
                         NULL,
                         NULL,
                         NULL);

/*
 * Module Parameters
 */

/*
 * dev_loss_tmo: the default number of seconds that the FC transport
 *   should insulate the loss of a remote port.
 *   The maximum will be capped by the value of SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
 */
static unsigned int fc_dev_loss_tmo = 60;       /* seconds */

module_param_named(dev_loss_tmo, fc_dev_loss_tmo, uint, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(dev_loss_tmo,
             "Maximum number of seconds that the FC transport should"
             " insulate the loss of a remote port. Once this value is"
             " exceeded, the scsi target is removed. Value should be"
             " between 1 and SCSI_DEVICE_BLOCK_MAX_TIMEOUT.");

/*
 * Netlink Infrastructure
 */

static atomic_t fc_event_seq;

/**
 * fc_get_event_number - Obtain the next sequential FC event number
 *
 * Notes:
 *   We could have inlined this, but it would have required fc_event_seq to
 *   be exposed. For now, live with the subroutine call.
 *   Atomic used to avoid lock/unlock...
 */
u32
fc_get_event_number(void)
{
      return atomic_add_return(1, &fc_event_seq);
}
EXPORT_SYMBOL(fc_get_event_number);


/**
 * fc_host_post_event - called to post an even on an fc_host.
 * @shost:        host the event occurred on
 * @event_number: fc event number obtained from get_fc_event_number()
 * @event_code:         fc_host event being posted
 * @event_data:         32bits of data for the event being posted
 *
 * Notes:
 *    This routine assumes no locks are held on entry.
 */
void
fc_host_post_event(struct Scsi_Host *shost, u32 event_number,
            enum fc_host_event_code event_code, u32 event_data)
{
      struct sk_buff *skb;
      struct nlmsghdr   *nlh;
      struct fc_nl_event *event;
      const char *name;
      u32 len, skblen;
      int err;

      if (!scsi_nl_sock) {
            err = -ENOENT;
            goto send_fail;
      }

      len = FC_NL_MSGALIGN(sizeof(*event));
      skblen = NLMSG_SPACE(len);

      skb = alloc_skb(skblen, GFP_KERNEL);
      if (!skb) {
            err = -ENOBUFS;
            goto send_fail;
      }

      nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG,
                        skblen - sizeof(*nlh), 0);
      if (!nlh) {
            err = -ENOBUFS;
            goto send_fail_skb;
      }
      event = NLMSG_DATA(nlh);

      INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
                        FC_NL_ASYNC_EVENT, len);
      event->seconds = get_seconds();
      event->vendor_id = 0;
      event->host_no = shost->host_no;
      event->event_datalen = sizeof(u32); /* bytes */
      event->event_num = event_number;
      event->event_code = event_code;
      event->event_data = event_data;

      nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
                  GFP_KERNEL);
      return;

send_fail_skb:
      kfree_skb(skb);
send_fail:
      name = get_fc_host_event_code_name(event_code);
      printk(KERN_WARNING
            "%s: Dropped Event : host %d %s data 0x%08x - err %d\n",
            __func__, shost->host_no,
            (name) ? name : "<unknown>", event_data, err);
      return;
}
EXPORT_SYMBOL(fc_host_post_event);


/**
 * fc_host_post_vendor_event - called to post a vendor unique event on an fc_host
 * @shost:        host the event occurred on
 * @event_number: fc event number obtained from get_fc_event_number()
 * @data_len:           amount, in bytes, of vendor unique data
 * @data_buf:           pointer to vendor unique data
 * @vendor_id:          Vendor id
 *
 * Notes:
 *    This routine assumes no locks are held on entry.
 */
void
fc_host_post_vendor_event(struct Scsi_Host *shost, u32 event_number,
            u32 data_len, char * data_buf, u64 vendor_id)
{
      struct sk_buff *skb;
      struct nlmsghdr   *nlh;
      struct fc_nl_event *event;
      u32 len, skblen;
      int err;

      if (!scsi_nl_sock) {
            err = -ENOENT;
            goto send_vendor_fail;
      }

      len = FC_NL_MSGALIGN(sizeof(*event) + data_len);
      skblen = NLMSG_SPACE(len);

      skb = alloc_skb(skblen, GFP_KERNEL);
      if (!skb) {
            err = -ENOBUFS;
            goto send_vendor_fail;
      }

      nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG,
                        skblen - sizeof(*nlh), 0);
      if (!nlh) {
            err = -ENOBUFS;
            goto send_vendor_fail_skb;
      }
      event = NLMSG_DATA(nlh);

      INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
                        FC_NL_ASYNC_EVENT, len);
      event->seconds = get_seconds();
      event->vendor_id = vendor_id;
      event->host_no = shost->host_no;
      event->event_datalen = data_len;    /* bytes */
      event->event_num = event_number;
      event->event_code = FCH_EVT_VENDOR_UNIQUE;
      memcpy(&event->event_data, data_buf, data_len);

      nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
                  GFP_KERNEL);
      return;

send_vendor_fail_skb:
      kfree_skb(skb);
send_vendor_fail:
      printk(KERN_WARNING
            "%s: Dropped Event : host %d vendor_unique - err %d\n",
            __func__, shost->host_no, err);
      return;
}
EXPORT_SYMBOL(fc_host_post_vendor_event);



static __init int fc_transport_init(void)
{
      int error;

      atomic_set(&fc_event_seq, 0);

      error = transport_class_register(&fc_host_class);
      if (error)
            return error;
      error = transport_class_register(&fc_vport_class);
      if (error)
            return error;
      error = transport_class_register(&fc_rport_class);
      if (error)
            return error;
      return transport_class_register(&fc_transport_class);
}

static void __exit fc_transport_exit(void)
{
      transport_class_unregister(&fc_transport_class);
      transport_class_unregister(&fc_rport_class);
      transport_class_unregister(&fc_host_class);
      transport_class_unregister(&fc_vport_class);
}

/*
 * FC Remote Port Attribute Management
 */

#define fc_rport_show_function(field, format_string, sz, cast)          \
static ssize_t                                              \
show_fc_rport_##field (struct device *dev,                        \
                   struct device_attribute *attr, char *buf)      \
{                                                     \
      struct fc_rport *rport = transport_class_to_rport(dev);           \
      struct Scsi_Host *shost = rport_to_shost(rport);            \
      struct fc_internal *i = to_fc_internal(shost->transportt);  \
      if ((i->f->get_rport_##field) &&                      \
          !((rport->port_state == FC_PORTSTATE_BLOCKED) ||        \
            (rport->port_state == FC_PORTSTATE_DELETED) ||        \
            (rport->port_state == FC_PORTSTATE_NOTPRESENT)))            \
            i->f->get_rport_##field(rport);                       \
      return snprintf(buf, sz, format_string, cast rport->field);       \
}

#define fc_rport_store_function(field)                            \
static ssize_t                                              \
store_fc_rport_##field(struct device *dev,                        \
                   struct device_attribute *attr,                 \
                   const char *buf, size_t count)                 \
{                                                     \
      int val;                                        \
      struct fc_rport *rport = transport_class_to_rport(dev);           \
      struct Scsi_Host *shost = rport_to_shost(rport);            \
      struct fc_internal *i = to_fc_internal(shost->transportt);  \
      char *cp;                                       \
      if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||          \
          (rport->port_state == FC_PORTSTATE_DELETED) ||          \
          (rport->port_state == FC_PORTSTATE_NOTPRESENT))         \
            return -EBUSY;                                  \
      val = simple_strtoul(buf, &cp, 0);                    \
      if (*cp && (*cp != '\n'))                             \
            return -EINVAL;                                 \
      i->f->set_rport_##field(rport, val);                        \
      return count;                                         \
}

#define fc_rport_rd_attr(field, format_string, sz)                \
      fc_rport_show_function(field, format_string, sz, )          \
static FC_DEVICE_ATTR(rport, field, S_IRUGO,                \
                   show_fc_rport_##field, NULL)

#define fc_rport_rd_attr_cast(field, format_string, sz, cast)           \
      fc_rport_show_function(field, format_string, sz, (cast))    \
static FC_DEVICE_ATTR(rport, field, S_IRUGO,                \
                    show_fc_rport_##field, NULL)

#define fc_rport_rw_attr(field, format_string, sz)                \
      fc_rport_show_function(field, format_string, sz, )          \
      fc_rport_store_function(field)                              \
static FC_DEVICE_ATTR(rport, field, S_IRUGO | S_IWUSR,            \
                  show_fc_rport_##field,                    \
                  store_fc_rport_##field)


#define fc_private_rport_show_function(field, format_string, sz, cast)  \
static ssize_t                                              \
show_fc_rport_##field (struct device *dev,                        \
                   struct device_attribute *attr, char *buf)      \
{                                                     \
      struct fc_rport *rport = transport_class_to_rport(dev);           \
      return snprintf(buf, sz, format_string, cast rport->field);       \
}

#define fc_private_rport_rd_attr(field, format_string, sz)        \
      fc_private_rport_show_function(field, format_string, sz, )  \
static FC_DEVICE_ATTR(rport, field, S_IRUGO,                \
                   show_fc_rport_##field, NULL)

#define fc_private_rport_rd_attr_cast(field, format_string, sz, cast)   \
      fc_private_rport_show_function(field, format_string, sz, (cast)) \
static FC_DEVICE_ATTR(rport, field, S_IRUGO,                \
                    show_fc_rport_##field, NULL)


#define fc_private_rport_rd_enum_attr(title, maxlen)              \
static ssize_t                                              \
show_fc_rport_##title (struct device *dev,                        \
                   struct device_attribute *attr, char *buf)      \
{                                                     \
      struct fc_rport *rport = transport_class_to_rport(dev);           \
      const char *name;                               \
      name = get_fc_##title##_name(rport->title);                 \
      if (!name)                                      \
            return -EINVAL;                                 \
      return snprintf(buf, maxlen, "%s\n", name);                 \
}                                                     \
static FC_DEVICE_ATTR(rport, title, S_IRUGO,                \
                  show_fc_rport_##title, NULL)


#define SETUP_RPORT_ATTRIBUTE_RD(field)                           \
      i->private_rport_attrs[count] = device_attr_rport_##field; \
      i->private_rport_attrs[count].attr.mode = S_IRUGO;          \
      i->private_rport_attrs[count].store = NULL;                 \
      i->rport_attrs[count] = &i->private_rport_attrs[count];           \
      if (i->f->show_rport_##field)                         \
            count++

#define SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(field)                   \
      i->private_rport_attrs[count] = device_attr_rport_##field; \
      i->private_rport_attrs[count].attr.mode = S_IRUGO;          \
      i->private_rport_attrs[count].store = NULL;                 \
      i->rport_attrs[count] = &i->private_rport_attrs[count];           \
      count++

#define SETUP_RPORT_ATTRIBUTE_RW(field)                           \
      i->private_rport_attrs[count] = device_attr_rport_##field; \
      if (!i->f->set_rport_##field) {                             \
            i->private_rport_attrs[count].attr.mode = S_IRUGO;    \
            i->private_rport_attrs[count].store = NULL;           \
      }                                               \
      i->rport_attrs[count] = &i->private_rport_attrs[count];           \
      if (i->f->show_rport_##field)                         \
            count++

#define SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(field)                   \
{                                                     \
      i->private_rport_attrs[count] = device_attr_rport_##field; \
      i->rport_attrs[count] = &i->private_rport_attrs[count];           \
      count++;                                        \
}


/* The FC Transport Remote Port Attributes: */

/* Fixed Remote Port Attributes */

fc_private_rport_rd_attr(maxframe_size, "%u bytes\n", 20);

static ssize_t
show_fc_rport_supported_classes (struct device *dev,
                         struct device_attribute *attr, char *buf)
{
      struct fc_rport *rport = transport_class_to_rport(dev);
      if (rport->supported_classes == FC_COS_UNSPECIFIED)
            return snprintf(buf, 20, "unspecified\n");
      return get_fc_cos_names(rport->supported_classes, buf);
}
static FC_DEVICE_ATTR(rport, supported_classes, S_IRUGO,
            show_fc_rport_supported_classes, NULL);

/* Dynamic Remote Port Attributes */

/*
 * dev_loss_tmo attribute
 */
fc_rport_show_function(dev_loss_tmo, "%d\n", 20, )
static ssize_t
store_fc_rport_dev_loss_tmo(struct device *dev, struct device_attribute *attr,
                      const char *buf, size_t count)
{
      int val;
      struct fc_rport *rport = transport_class_to_rport(dev);
      struct Scsi_Host *shost = rport_to_shost(rport);
      struct fc_internal *i = to_fc_internal(shost->transportt);
      char *cp;
      if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
          (rport->port_state == FC_PORTSTATE_DELETED) ||
          (rport->port_state == FC_PORTSTATE_NOTPRESENT))
            return -EBUSY;
      val = simple_strtoul(buf, &cp, 0);
      if ((*cp && (*cp != '\n')) ||
          (val < 0) || (val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT))
            return -EINVAL;
      i->f->set_rport_dev_loss_tmo(rport, val);
      return count;
}
static FC_DEVICE_ATTR(rport, dev_loss_tmo, S_IRUGO | S_IWUSR,
            show_fc_rport_dev_loss_tmo, store_fc_rport_dev_loss_tmo);


/* Private Remote Port Attributes */

fc_private_rport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
fc_private_rport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
fc_private_rport_rd_attr(port_id, "0x%06x\n", 20);

static ssize_t
show_fc_rport_roles (struct device *dev, struct device_attribute *attr,
                 char *buf)
{
      struct fc_rport *rport = transport_class_to_rport(dev);

      /* identify any roles that are port_id specific */
      if ((rport->port_id != -1) &&
          (rport->port_id & FC_WELLKNOWN_PORTID_MASK) ==
                              FC_WELLKNOWN_PORTID_MASK) {
            switch (rport->port_id & FC_WELLKNOWN_ROLE_MASK) {
            case FC_FPORT_PORTID:
                  return snprintf(buf, 30, "Fabric Port\n");
            case FC_FABCTLR_PORTID:
                  return snprintf(buf, 30, "Fabric Controller\n");
            case FC_DIRSRVR_PORTID:
                  return snprintf(buf, 30, "Directory Server\n");
            case FC_TIMESRVR_PORTID:
                  return snprintf(buf, 30, "Time Server\n");
            case FC_MGMTSRVR_PORTID:
                  return snprintf(buf, 30, "Management Server\n");
            default:
                  return snprintf(buf, 30, "Unknown Fabric Entity\n");
            }
      } else {
            if (rport->roles == FC_PORT_ROLE_UNKNOWN)
                  return snprintf(buf, 20, "unknown\n");
            return get_fc_port_roles_names(rport->roles, buf);
      }
}
static FC_DEVICE_ATTR(rport, roles, S_IRUGO,
            show_fc_rport_roles, NULL);

fc_private_rport_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
fc_private_rport_rd_attr(scsi_target_id, "%d\n", 20);

/*
 * fast_io_fail_tmo attribute
 */
static ssize_t
show_fc_rport_fast_io_fail_tmo (struct device *dev,
                        struct device_attribute *attr, char *buf)
{
      struct fc_rport *rport = transport_class_to_rport(dev);

      if (rport->fast_io_fail_tmo == -1)
            return snprintf(buf, 5, "off\n");
      return snprintf(buf, 20, "%d\n", rport->fast_io_fail_tmo);
}

static ssize_t
store_fc_rport_fast_io_fail_tmo(struct device *dev,
                        struct device_attribute *attr, const char *buf,
                        size_t count)
{
      int val;
      char *cp;
      struct fc_rport *rport = transport_class_to_rport(dev);

      if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
          (rport->port_state == FC_PORTSTATE_DELETED) ||
          (rport->port_state == FC_PORTSTATE_NOTPRESENT))
            return -EBUSY;
      if (strncmp(buf, "off", 3) == 0)
            rport->fast_io_fail_tmo = -1;
      else {
            val = simple_strtoul(buf, &cp, 0);
            if ((*cp && (*cp != '\n')) ||
                (val < 0) || (val >= rport->dev_loss_tmo))
                  return -EINVAL;
            rport->fast_io_fail_tmo = val;
      }
      return count;
}
static FC_DEVICE_ATTR(rport, fast_io_fail_tmo, S_IRUGO | S_IWUSR,
      show_fc_rport_fast_io_fail_tmo, store_fc_rport_fast_io_fail_tmo);


/*
 * FC SCSI Target Attribute Management
 */

/*
 * Note: in the target show function we recognize when the remote
 *  port is in the heirarchy and do not allow the driver to get
 *  involved in sysfs functions. The driver only gets involved if
 *  it's the "old" style that doesn't use rports.
 */
#define fc_starget_show_function(field, format_string, sz, cast)  \
static ssize_t                                              \
show_fc_starget_##field (struct device *dev,                      \
                   struct device_attribute *attr, char *buf)      \
{                                                     \
      struct scsi_target *starget = transport_class_to_starget(dev);    \
      struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);      \
      struct fc_internal *i = to_fc_internal(shost->transportt);  \
      struct fc_rport *rport = starget_to_rport(starget);         \
      if (rport)                                      \
            fc_starget_##field(starget) = rport->field;           \
      else if (i->f->get_starget_##field)                   \
            i->f->get_starget_##field(starget);             \
      return snprintf(buf, sz, format_string,               \
            cast fc_starget_##field(starget));              \
}

#define fc_starget_rd_attr(field, format_string, sz)              \
      fc_starget_show_function(field, format_string, sz, )        \
static FC_DEVICE_ATTR(starget, field, S_IRUGO,              \
                   show_fc_starget_##field, NULL)

#define fc_starget_rd_attr_cast(field, format_string, sz, cast)         \
      fc_starget_show_function(field, format_string, sz, (cast))  \
static FC_DEVICE_ATTR(starget, field, S_IRUGO,              \
                    show_fc_starget_##field, NULL)

#define SETUP_STARGET_ATTRIBUTE_RD(field)                   \
      i->private_starget_attrs[count] = device_attr_starget_##field; \
      i->private_starget_attrs[count].attr.mode = S_IRUGO;        \
      i->private_starget_attrs[count].store = NULL;               \
      i->starget_attrs[count] = &i->private_starget_attrs[count]; \
      if (i->f->show_starget_##field)                             \
            count++

#define SETUP_STARGET_ATTRIBUTE_RW(field)                   \
      i->private_starget_attrs[count] = device_attr_starget_##field; \
      if (!i->f->set_starget_##field) {                     \
            i->private_starget_attrs[count].attr.mode = S_IRUGO;  \
            i->private_starget_attrs[count].store = NULL;         \
      }                                               \
      i->starget_attrs[count] = &i->private_starget_attrs[count]; \
      if (i->f->show_starget_##field)                             \
            count++

/* The FC Transport SCSI Target Attributes: */
fc_starget_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
fc_starget_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
fc_starget_rd_attr(port_id, "0x%06x\n", 20);


/*
 * FC Virtual Port Attribute Management
 */

#define fc_vport_show_function(field, format_string, sz, cast)          \
static ssize_t                                              \
show_fc_vport_##field (struct device *dev,                        \
                   struct device_attribute *attr, char *buf)      \
{                                                     \
      struct fc_vport *vport = transport_class_to_vport(dev);           \
      struct Scsi_Host *shost = vport_to_shost(vport);            \
      struct fc_internal *i = to_fc_internal(shost->transportt);  \
      if ((i->f->get_vport_##field) &&                      \
          !(vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)))   \
            i->f->get_vport_##field(vport);                       \
      return snprintf(buf, sz, format_string, cast vport->field);       \
}

#define fc_vport_store_function(field)                            \
static ssize_t                                              \
store_fc_vport_##field(struct device *dev,                        \
                   struct device_attribute *attr,                 \
                   const char *buf, size_t count)                 \
{                                                     \
      int val;                                        \
      struct fc_vport *vport = transport_class_to_vport(dev);           \
      struct Scsi_Host *shost = vport_to_shost(vport);            \
      struct fc_internal *i = to_fc_internal(shost->transportt);  \
      char *cp;                                       \
      if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))      \
            return -EBUSY;                                  \
      val = simple_strtoul(buf, &cp, 0);                    \
      if (*cp && (*cp != '\n'))                             \
            return -EINVAL;                                 \
      i->f->set_vport_##field(vport, val);                        \
      return count;                                         \
}

#define fc_vport_store_str_function(field, slen)                  \
static ssize_t                                              \
store_fc_vport_##field(struct device *dev,                        \
                   struct device_attribute *attr,                 \
                   const char *buf, size_t count)                 \
{                                                     \
      struct fc_vport *vport = transport_class_to_vport(dev);           \
      struct Scsi_Host *shost = vport_to_shost(vport);            \
      struct fc_internal *i = to_fc_internal(shost->transportt);  \
      unsigned int cnt=count;                               \
                                                      \
      /* count may include a LF at end of string */               \
      if (buf[cnt-1] == '\n')                               \
            cnt--;                                          \
      if (cnt > ((slen) - 1))                               \
            return -EINVAL;                                 \
      memcpy(vport->field, buf, cnt);                             \
      i->f->set_vport_##field(vport);                             \
      return count;                                         \
}

#define fc_vport_rd_attr(field, format_string, sz)                \
      fc_vport_show_function(field, format_string, sz, )          \
static FC_DEVICE_ATTR(vport, field, S_IRUGO,                \
                   show_fc_vport_##field, NULL)

#define fc_vport_rd_attr_cast(field, format_string, sz, cast)           \
      fc_vport_show_function(field, format_string, sz, (cast))    \
static FC_DEVICE_ATTR(vport, field, S_IRUGO,                \
                    show_fc_vport_##field, NULL)

#define fc_vport_rw_attr(field, format_string, sz)                \
      fc_vport_show_function(field, format_string, sz, )          \
      fc_vport_store_function(field)                              \
static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR,            \
                  show_fc_vport_##field,                    \
                  store_fc_vport_##field)

#define fc_private_vport_show_function(field, format_string, sz, cast)  \
static ssize_t                                              \
show_fc_vport_##field (struct device *dev,                        \
                   struct device_attribute *attr, char *buf)      \
{                                                     \
      struct fc_vport *vport = transport_class_to_vport(dev);           \
      return snprintf(buf, sz, format_string, cast vport->field);       \
}

#define fc_private_vport_store_u32_function(field)                \
static ssize_t                                              \
store_fc_vport_##field(struct device *dev,                        \
                   struct device_attribute *attr,                 \
                   const char *buf, size_t count)                 \
{                                                     \
      u32 val;                                        \
      struct fc_vport *vport = transport_class_to_vport(dev);           \
      char *cp;                                       \
      if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))            \
            return -EBUSY;                                  \
      val = simple_strtoul(buf, &cp, 0);                    \
      if (*cp && (*cp != '\n'))                             \
            return -EINVAL;                                 \
      vport->field = val;                                   \
      return count;                                         \
}


#define fc_private_vport_rd_attr(field, format_string, sz)        \
      fc_private_vport_show_function(field, format_string, sz, )  \
static FC_DEVICE_ATTR(vport, field, S_IRUGO,                \
                   show_fc_vport_##field, NULL)

#define fc_private_vport_rd_attr_cast(field, format_string, sz, cast)   \
      fc_private_vport_show_function(field, format_string, sz, (cast)) \
static FC_DEVICE_ATTR(vport, field, S_IRUGO,                \
                    show_fc_vport_##field, NULL)

#define fc_private_vport_rw_u32_attr(field, format_string, sz)          \
      fc_private_vport_show_function(field, format_string, sz, )  \
      fc_private_vport_store_u32_function(field)                  \
static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR,            \
                  show_fc_vport_##field,                    \
                  store_fc_vport_##field)


#define fc_private_vport_rd_enum_attr(title, maxlen)              \
static ssize_t                                              \
show_fc_vport_##title (struct device *dev,                        \
                   struct device_attribute *attr,                 \
                   char *buf)                         \
{                                                     \
      struct fc_vport *vport = transport_class_to_vport(dev);           \
      const char *name;                               \
      name = get_fc_##title##_name(vport->title);                 \
      if (!name)                                      \
            return -EINVAL;                                 \
      return snprintf(buf, maxlen, "%s\n", name);                 \
}                                                     \
static FC_DEVICE_ATTR(vport, title, S_IRUGO,                \
                  show_fc_vport_##title, NULL)


#define SETUP_VPORT_ATTRIBUTE_RD(field)                           \
      i->private_vport_attrs[count] = device_attr_vport_##field; \
      i->private_vport_attrs[count].attr.mode = S_IRUGO;          \
      i->private_vport_attrs[count].store = NULL;                 \
      i->vport_attrs[count] = &i->private_vport_attrs[count];           \
      if (i->f->get_##field)                                \
            count++
      /* NOTE: Above MACRO differs: checks function not show bit */

#define SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(field)                   \
      i->private_vport_attrs[count] = device_attr_vport_##field; \
      i->private_vport_attrs[count].attr.mode = S_IRUGO;          \
      i->private_vport_attrs[count].store = NULL;                 \
      i->vport_attrs[count] = &i->private_vport_attrs[count];           \
      count++

#define SETUP_VPORT_ATTRIBUTE_WR(field)                           \
      i->private_vport_attrs[count] = device_attr_vport_##field; \
      i->vport_attrs[count] = &i->private_vport_attrs[count];           \
      if (i->f->field)                                \
            count++
      /* NOTE: Above MACRO differs: checks function */

#define SETUP_VPORT_ATTRIBUTE_RW(field)                           \
      i->private_vport_attrs[count] = device_attr_vport_##field; \
      if (!i->f->set_vport_##field) {                             \
            i->private_vport_attrs[count].attr.mode = S_IRUGO;    \
            i->private_vport_attrs[count].store = NULL;           \
      }                                               \
      i->vport_attrs[count] = &i->private_vport_attrs[count];           \
      count++
      /* NOTE: Above MACRO differs: does not check show bit */

#define SETUP_PRIVATE_VPORT_ATTRIBUTE_RW(field)                   \
{                                                     \
      i->private_vport_attrs[count] = device_attr_vport_##field; \
      i->vport_attrs[count] = &i->private_vport_attrs[count];           \
      count++;                                        \
}


/* The FC Transport Virtual Port Attributes: */

/* Fixed Virtual Port Attributes */

/* Dynamic Virtual Port Attributes */

/* Private Virtual Port Attributes */

fc_private_vport_rd_enum_attr(vport_state, FC_VPORTSTATE_MAX_NAMELEN);
fc_private_vport_rd_enum_attr(vport_last_state, FC_VPORTSTATE_MAX_NAMELEN);
fc_private_vport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
fc_private_vport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);

static ssize_t
show_fc_vport_roles (struct device *dev, struct device_attribute *attr,
                 char *buf)
{
      struct fc_vport *vport = transport_class_to_vport(dev);

      if (vport->roles == FC_PORT_ROLE_UNKNOWN)
            return snprintf(buf, 20, "unknown\n");
      return get_fc_port_roles_names(vport->roles, buf);
}
static FC_DEVICE_ATTR(vport, roles, S_IRUGO, show_fc_vport_roles, NULL);

fc_private_vport_rd_enum_attr(vport_type, FC_PORTTYPE_MAX_NAMELEN);

fc_private_vport_show_function(symbolic_name, "%s\n",
            FC_VPORT_SYMBOLIC_NAMELEN + 1, )
fc_vport_store_str_function(symbolic_name, FC_VPORT_SYMBOLIC_NAMELEN)
static FC_DEVICE_ATTR(vport, symbolic_name, S_IRUGO | S_IWUSR,
            show_fc_vport_symbolic_name, store_fc_vport_symbolic_name);

static ssize_t
store_fc_vport_delete(struct device *dev, struct device_attribute *attr,
                  const char *buf, size_t count)
{
      struct fc_vport *vport = transport_class_to_vport(dev);
      struct Scsi_Host *shost = vport_to_shost(vport);

      fc_queue_work(shost, &vport->vport_delete_work);
      return count;
}
static FC_DEVICE_ATTR(vport, vport_delete, S_IWUSR,
                  NULL, store_fc_vport_delete);


/*
 * Enable/Disable vport
 *  Write "1" to disable, write "0" to enable
 */
static ssize_t
store_fc_vport_disable(struct device *dev, struct device_attribute *attr,
                   const char *buf,
                     size_t count)
{
      struct fc_vport *vport = transport_class_to_vport(dev);
      struct Scsi_Host *shost = vport_to_shost(vport);
      struct fc_internal *i = to_fc_internal(shost->transportt);
      int stat;

      if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))
            return -EBUSY;

      if (*buf == '0') {
            if (vport->vport_state != FC_VPORT_DISABLED)
                  return -EALREADY;
      } else if (*buf == '1') {
            if (vport->vport_state == FC_VPORT_DISABLED)
                  return -EALREADY;
      } else
            return -EINVAL;

      stat = i->f->vport_disable(vport, ((*buf == '0') ? false : true));
      return stat ? stat : count;
}
static FC_DEVICE_ATTR(vport, vport_disable, S_IWUSR,
                  NULL, store_fc_vport_disable);


/*
 * Host Attribute Management
 */

#define fc_host_show_function(field, format_string, sz, cast)           \
static ssize_t                                              \
show_fc_host_##field (struct device *dev,                   \
                  struct device_attribute *attr, char *buf)       \
{                                                     \
      struct Scsi_Host *shost = transport_class_to_shost(dev);    \
      struct fc_internal *i = to_fc_internal(shost->transportt);  \
      if (i->f->get_host_##field)                           \
            i->f->get_host_##field(shost);                        \
      return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
}

#define fc_host_store_function(field)                             \
static ssize_t                                              \
store_fc_host_##field(struct device *dev,                         \
                  struct device_attribute *attr,                  \
                  const char *buf,  size_t count)                 \
{                                                     \
      int val;                                        \
      struct Scsi_Host *shost = transport_class_to_shost(dev);    \
      struct fc_internal *i = to_fc_internal(shost->transportt);  \
      char *cp;                                       \
                                                      \
      val = simple_strtoul(buf, &cp, 0);                    \
      if (*cp && (*cp != '\n'))                             \
            return -EINVAL;                                 \
      i->f->set_host_##field(shost, val);                   \
      return count;                                         \
}

#define fc_host_store_str_function(field, slen)                   \
static ssize_t                                              \
store_fc_host_##field(struct device *dev,                   \
                  struct device_attribute *attr,                  \
                  const char *buf, size_t count)                  \
{                                                     \
      struct Scsi_Host *shost = transport_class_to_shost(dev);    \
      struct fc_internal *i = to_fc_internal(shost->transportt);  \
      unsigned int cnt=count;                               \
                                                      \
      /* count may include a LF at end of string */               \
      if (buf[cnt-1] == '\n')                               \
            cnt--;                                          \
      if (cnt > ((slen) - 1))                               \
            return -EINVAL;                                 \
      memcpy(fc_host_##field(shost), buf, cnt);             \
      i->f->set_host_##field(shost);                              \
      return count;                                         \
}

#define fc_host_rd_attr(field, format_string, sz)                 \
      fc_host_show_function(field, format_string, sz, )           \
static FC_DEVICE_ATTR(host, field, S_IRUGO,                 \
                   show_fc_host_##field, NULL)

#define fc_host_rd_attr_cast(field, format_string, sz, cast)            \
      fc_host_show_function(field, format_string, sz, (cast))           \
static FC_DEVICE_ATTR(host, field, S_IRUGO,                 \
                    show_fc_host_##field, NULL)

#define fc_host_rw_attr(field, format_string, sz)                 \
      fc_host_show_function(field, format_string, sz, )           \
      fc_host_store_function(field)                         \
static FC_DEVICE_ATTR(host, field, S_IRUGO | S_IWUSR,       \
                  show_fc_host_##field,                     \
                  store_fc_host_##field)

#define fc_host_rd_enum_attr(title, maxlen)                       \
static ssize_t                                              \
show_fc_host_##title (struct device *dev,                   \
                  struct device_attribute *attr, char *buf)       \
{                                                     \
      struct Scsi_Host *shost = transport_class_to_shost(dev);    \
      struct fc_internal *i = to_fc_internal(shost->transportt);  \
      const char *name;                               \
      if (i->f->get_host_##title)                           \
            i->f->get_host_##title(shost);                        \
      name = get_fc_##title##_name(fc_host_##title(shost));       \
      if (!name)                                      \
            return -EINVAL;                                 \
      return snprintf(buf, maxlen, "%s\n", name);                 \
}                                                     \
static FC_DEVICE_ATTR(host, title, S_IRUGO, show_fc_host_##title, NULL)

#define SETUP_HOST_ATTRIBUTE_RD(field)                            \
      i->private_host_attrs[count] = device_attr_host_##field;    \
      i->private_host_attrs[count].attr.mode = S_IRUGO;           \
      i->private_host_attrs[count].store = NULL;                  \
      i->host_attrs[count] = &i->private_host_attrs[count];       \
      if (i->f->show_host_##field)                          \
            count++

#define SETUP_HOST_ATTRIBUTE_RD_NS(field)                   \
      i->private_host_attrs[count] = device_attr_host_##field;    \
      i->private_host_attrs[count].attr.mode = S_IRUGO;           \
      i->private_host_attrs[count].store = NULL;                  \
      i->host_attrs[count] = &i->private_host_attrs[count];       \
      count++

#define SETUP_HOST_ATTRIBUTE_RW(field)                            \
      i->private_host_attrs[count] = device_attr_host_##field;    \
      if (!i->f->set_host_##field) {                              \
            i->private_host_attrs[count].attr.mode = S_IRUGO;     \
            i->private_host_attrs[count].store = NULL;            \
      }                                               \
      i->host_attrs[count] = &i->private_host_attrs[count];       \
      if (i->f->show_host_##field)                          \
            count++


#define fc_private_host_show_function(field, format_string, sz, cast)   \
static ssize_t                                              \
show_fc_host_##field (struct device *dev,                   \
                  struct device_attribute *attr, char *buf)       \
{                                                     \
      struct Scsi_Host *shost = transport_class_to_shost(dev);    \
      return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
}

#define fc_private_host_rd_attr(field, format_string, sz)         \
      fc_private_host_show_function(field, format_string, sz, )   \
static FC_DEVICE_ATTR(host, field, S_IRUGO,                 \
                   show_fc_host_##field, NULL)

#define fc_private_host_rd_attr_cast(field, format_string, sz, cast)    \
      fc_private_host_show_function(field, format_string, sz, (cast)) \
static FC_DEVICE_ATTR(host, field, S_IRUGO,                 \
                    show_fc_host_##field, NULL)

#define SETUP_PRIVATE_HOST_ATTRIBUTE_RD(field)              \
      i->private_host_attrs[count] = device_attr_host_##field;    \
      i->private_host_attrs[count].attr.mode = S_IRUGO;           \
      i->private_host_attrs[count].store = NULL;                  \
      i->host_attrs[count] = &i->private_host_attrs[count];       \
      count++

#define SETUP_PRIVATE_HOST_ATTRIBUTE_RW(field)              \
{                                                     \
      i->private_host_attrs[count] = device_attr_host_##field;    \
      i->host_attrs[count] = &i->private_host_attrs[count];       \
      count++;                                        \
}


/* Fixed Host Attributes */

static ssize_t
show_fc_host_supported_classes (struct device *dev,
                          struct device_attribute *attr, char *buf)
{
      struct Scsi_Host *shost = transport_class_to_shost(dev);

      if (fc_host_supported_classes(shost) == FC_COS_UNSPECIFIED)
            return snprintf(buf, 20, "unspecified\n");

      return get_fc_cos_names(fc_host_supported_classes(shost), buf);
}
static FC_DEVICE_ATTR(host, supported_classes, S_IRUGO,
            show_fc_host_supported_classes, NULL);

static ssize_t
show_fc_host_supported_fc4s (struct device *dev,
                       struct device_attribute *attr, char *buf)
{
      struct Scsi_Host *shost = transport_class_to_shost(dev);
      return (ssize_t)show_fc_fc4s(buf, fc_host_supported_fc4s(shost));
}
static FC_DEVICE_ATTR(host, supported_fc4s, S_IRUGO,
            show_fc_host_supported_fc4s, NULL);

static ssize_t
show_fc_host_supported_speeds (struct device *dev,
                         struct device_attribute *attr, char *buf)
{
      struct Scsi_Host *shost = transport_class_to_shost(dev);

      if (fc_host_supported_speeds(shost) == FC_PORTSPEED_UNKNOWN)
            return snprintf(buf, 20, "unknown\n");

      return get_fc_port_speed_names(fc_host_supported_speeds(shost), buf);
}
static FC_DEVICE_ATTR(host, supported_speeds, S_IRUGO,
            show_fc_host_supported_speeds, NULL);


fc_private_host_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
fc_private_host_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
fc_private_host_rd_attr_cast(permanent_port_name, "0x%llx\n", 20,
                       unsigned long long);
fc_private_host_rd_attr(maxframe_size, "%u bytes\n", 20);
fc_private_host_rd_attr(max_npiv_vports, "%u\n", 20);
fc_private_host_rd_attr(serial_number, "%s\n", (FC_SERIAL_NUMBER_SIZE +1));


/* Dynamic Host Attributes */

static ssize_t
show_fc_host_active_fc4s (struct device *dev,
                    struct device_attribute *attr, char *buf)
{
      struct Scsi_Host *shost = transport_class_to_shost(dev);
      struct fc_internal *i = to_fc_internal(shost->transportt);

      if (i->f->get_host_active_fc4s)
            i->f->get_host_active_fc4s(shost);

      return (ssize_t)show_fc_fc4s(buf, fc_host_active_fc4s(shost));
}
static FC_DEVICE_ATTR(host, active_fc4s, S_IRUGO,
            show_fc_host_active_fc4s, NULL);

static ssize_t
show_fc_host_speed (struct device *dev,
                struct device_attribute *attr, char *buf)
{
      struct Scsi_Host *shost = transport_class_to_shost(dev);
      struct fc_internal *i = to_fc_internal(shost->transportt);

      if (i->f->get_host_speed)
            i->f->get_host_speed(shost);

      if (fc_host_speed(shost) == FC_PORTSPEED_UNKNOWN)
            return snprintf(buf, 20, "unknown\n");

      return get_fc_port_speed_names(fc_host_speed(shost), buf);
}
static FC_DEVICE_ATTR(host, speed, S_IRUGO,
            show_fc_host_speed, NULL);


fc_host_rd_attr(port_id, "0x%06x\n", 20);
fc_host_rd_enum_attr(port_type, FC_PORTTYPE_MAX_NAMELEN);
fc_host_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
fc_host_rd_attr_cast(fabric_name, "0x%llx\n", 20, unsigned long long);
fc_host_rd_attr(symbolic_name, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);

fc_private_host_show_function(system_hostname, "%s\n",
            FC_SYMBOLIC_NAME_SIZE + 1, )
fc_host_store_str_function(system_hostname, FC_SYMBOLIC_NAME_SIZE)
static FC_DEVICE_ATTR(host, system_hostname, S_IRUGO | S_IWUSR,
            show_fc_host_system_hostname, store_fc_host_system_hostname);


/* Private Host Attributes */

static ssize_t
show_fc_private_host_tgtid_bind_type(struct device *dev,
                             struct device_attribute *attr, char *buf)
{
      struct Scsi_Host *shost = transport_class_to_shost(dev);
      const char *name;

      name = get_fc_tgtid_bind_type_name(fc_host_tgtid_bind_type(shost));
      if (!name)
            return -EINVAL;
      return snprintf(buf, FC_BINDTYPE_MAX_NAMELEN, "%s\n", name);
}

#define get_list_head_entry(pos, head, member)        \
      pos = list_entry((head)->next, typeof(*pos), member)

static ssize_t
store_fc_private_host_tgtid_bind_type(struct device *dev,
      struct device_attribute *attr, const char *buf, size_t count)
{
      struct Scsi_Host *shost = transport_class_to_shost(dev);
      struct fc_rport *rport;
      enum fc_tgtid_binding_type val;
      unsigned long flags;

      if (get_fc_tgtid_bind_type_match(buf, &val))
            return -EINVAL;

      /* if changing bind type, purge all unused consistent bindings */
      if (val != fc_host_tgtid_bind_type(shost)) {
            spin_lock_irqsave(shost->host_lock, flags);
            while (!list_empty(&fc_host_rport_bindings(shost))) {
                  get_list_head_entry(rport,
                        &fc_host_rport_bindings(shost), peers);
                  list_del(&rport->peers);
                  rport->port_state = FC_PORTSTATE_DELETED;
                  fc_queue_work(shost, &rport->rport_delete_work);
            }
            spin_unlock_irqrestore(shost->host_lock, flags);
      }

      fc_host_tgtid_bind_type(shost) = val;
      return count;
}

static FC_DEVICE_ATTR(host, tgtid_bind_type, S_IRUGO | S_IWUSR,
                  show_fc_private_host_tgtid_bind_type,
                  store_fc_private_host_tgtid_bind_type);

static ssize_t
store_fc_private_host_issue_lip(struct device *dev,
      struct device_attribute *attr, const char *buf, size_t count)
{
      struct Scsi_Host *shost = transport_class_to_shost(dev);
      struct fc_internal *i = to_fc_internal(shost->transportt);
      int ret;

      /* ignore any data value written to the attribute */
      if (i->f->issue_fc_host_lip) {
            ret = i->f->issue_fc_host_lip(shost);
            return ret ? ret: count;
      }

      return -ENOENT;
}

static FC_DEVICE_ATTR(host, issue_lip, S_IWUSR, NULL,
                  store_fc_private_host_issue_lip);

fc_private_host_rd_attr(npiv_vports_inuse, "%u\n", 20);


/*
 * Host Statistics Management
 */

/* Show a given an attribute in the statistics group */
static ssize_t
fc_stat_show(const struct device *dev, char *buf, unsigned long offset)
{
      struct Scsi_Host *shost = transport_class_to_shost(dev);
      struct fc_internal *i = to_fc_internal(shost->transportt);
      struct fc_host_statistics *stats;
      ssize_t ret = -ENOENT;

      if (offset > sizeof(struct fc_host_statistics) ||
          offset % sizeof(u64) != 0)
            WARN_ON(1);

      if (i->f->get_fc_host_stats) {
            stats = (i->f->get_fc_host_stats)(shost);
            if (stats)
                  ret = snprintf(buf, 20, "0x%llx\n",
                        (unsigned long long)*(u64 *)(((u8 *) stats) + offset));
      }
      return ret;
}


/* generate a read-only statistics attribute */
#define fc_host_statistic(name)                                   \
static ssize_t show_fcstat_##name(struct device *cd,              \
                          struct device_attribute *attr,    \
                          char *buf)                        \
{                                                     \
      return fc_stat_show(cd, buf,                          \
                      offsetof(struct fc_host_statistics, name)); \
}                                                     \
static FC_DEVICE_ATTR(host, name, S_IRUGO, show_fcstat_##name, NULL)

fc_host_statistic(seconds_since_last_reset);
fc_host_statistic(tx_frames);
fc_host_statistic(tx_words);
fc_host_statistic(rx_frames);
fc_host_statistic(rx_words);
fc_host_statistic(lip_count);
fc_host_statistic(nos_count);
fc_host_statistic(error_frames);
fc_host_statistic(dumped_frames);
fc_host_statistic(link_failure_count);
fc_host_statistic(loss_of_sync_count);
fc_host_statistic(loss_of_signal_count);
fc_host_statistic(prim_seq_protocol_err_count);
fc_host_statistic(invalid_tx_word_count);
fc_host_statistic(invalid_crc_count);
fc_host_statistic(fcp_input_requests);
fc_host_statistic(fcp_output_requests);
fc_host_statistic(fcp_control_requests);
fc_host_statistic(fcp_input_megabytes);
fc_host_statistic(fcp_output_megabytes);

static ssize_t
fc_reset_statistics(struct device *dev, struct device_attribute *attr,
                const char *buf, size_t count)
{
      struct Scsi_Host *shost = transport_class_to_shost(dev);
      struct fc_internal *i = to_fc_internal(shost->transportt);

      /* ignore any data value written to the attribute */
      if (i->f->reset_fc_host_stats) {
            i->f->reset_fc_host_stats(shost);
            return count;
      }

      return -ENOENT;
}
static FC_DEVICE_ATTR(host, reset_statistics, S_IWUSR, NULL,
                        fc_reset_statistics);

static struct attribute *fc_statistics_attrs[] = {
      &device_attr_host_seconds_since_last_reset.attr,
      &device_attr_host_tx_frames.attr,
      &device_attr_host_tx_words.attr,
      &device_attr_host_rx_frames.attr,
      &device_attr_host_rx_words.attr,
      &device_attr_host_lip_count.attr,
      &device_attr_host_nos_count.attr,
      &device_attr_host_error_frames.attr,
      &device_attr_host_dumped_frames.attr,
      &device_attr_host_link_failure_count.attr,
      &device_attr_host_loss_of_sync_count.attr,
      &device_attr_host_loss_of_signal_count.attr,
      &device_attr_host_prim_seq_protocol_err_count.attr,
      &device_attr_host_invalid_tx_word_count.attr,
      &device_attr_host_invalid_crc_count.attr,
      &device_attr_host_fcp_input_requests.attr,
      &device_attr_host_fcp_output_requests.attr,
      &device_attr_host_fcp_control_requests.attr,
      &device_attr_host_fcp_input_megabytes.attr,
      &device_attr_host_fcp_output_megabytes.attr,
      &device_attr_host_reset_statistics.attr,
      NULL
};

static struct attribute_group fc_statistics_group = {
      .name = "statistics",
      .attrs = fc_statistics_attrs,
};


/* Host Vport Attributes */

static int
fc_parse_wwn(const char *ns, u64 *nm)
{
      unsigned int i, j;
      u8 wwn[8];

      memset(wwn, 0, sizeof(wwn));

      /* Validate and store the new name */
      for (i=0, j=0; i < 16; i++) {
            if ((*ns >= 'a') && (*ns <= 'f'))
                  j = ((j << 4) | ((*ns++ -'a') + 10));
            else if ((*ns >= 'A') && (*ns <= 'F'))
                  j = ((j << 4) | ((*ns++ -'A') + 10));
            else if ((*ns >= '0') && (*ns <= '9'))
                  j = ((j << 4) | (*ns++ -'0'));
            else
                  return -EINVAL;
            if (i % 2) {
                  wwn[i/2] = j & 0xff;
                  j = 0;
            }
      }

      *nm = wwn_to_u64(wwn);

      return 0;
}


/*
 * "Short-cut" sysfs variable to create a new vport on a FC Host.
 * Input is a string of the form "<WWPN>:<WWNN>". Other attributes
 * will default to a NPIV-based FCP_Initiator; The WWNs are specified
 * as hex characters, and may *not* contain any prefixes (e.g. 0x, x, etc)
 */
static ssize_t
store_fc_host_vport_create(struct device *dev, struct device_attribute *attr,
                     const char *buf, size_t count)
{
      struct Scsi_Host *shost = transport_class_to_shost(dev);
      struct fc_vport_identifiers vid;
      struct fc_vport *vport;
      unsigned int cnt=count;
      int stat;

      memset(&vid, 0, sizeof(vid));

      /* count may include a LF at end of string */
      if (buf[cnt-1] == '\n')
            cnt--;

      /* validate we have enough characters for WWPN */
      if ((cnt != (16+1+16)) || (buf[16] != ':'))
            return -EINVAL;

      stat = fc_parse_wwn(&buf[0], &vid.port_name);
      if (stat)
            return stat;

      stat = fc_parse_wwn(&buf[17], &vid.node_name);
      if (stat)
            return stat;

      vid.roles = FC_PORT_ROLE_FCP_INITIATOR;
      vid.vport_type = FC_PORTTYPE_NPIV;
      /* vid.symbolic_name is already zero/NULL's */
      vid.disable = false;          /* always enabled */

      /* we only allow support on Channel 0 !!! */
      stat = fc_vport_setup(shost, 0, &shost->shost_gendev, &vid, &vport);
      return stat ? stat : count;
}
static FC_DEVICE_ATTR(host, vport_create, S_IWUSR, NULL,
                  store_fc_host_vport_create);


/*
 * "Short-cut" sysfs variable to delete a vport on a FC Host.
 * Vport is identified by a string containing "<WWPN>:<WWNN>".
 * The WWNs are specified as hex characters, and may *not* contain
 * any prefixes (e.g. 0x, x, etc)
 */
static ssize_t
store_fc_host_vport_delete(struct device *dev, struct device_attribute *attr,
                     const char *buf, size_t count)
{
      struct Scsi_Host *shost = transport_class_to_shost(dev);
      struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
      struct fc_vport *vport;
      u64 wwpn, wwnn;
      unsigned long flags;
      unsigned int cnt=count;
      int stat, match;

      /* count may include a LF at end of string */
      if (buf[cnt-1] == '\n')
            cnt--;

      /* validate we have enough characters for WWPN */
      if ((cnt != (16+1+16)) || (buf[16] != ':'))
            return -EINVAL;

      stat = fc_parse_wwn(&buf[0], &wwpn);
      if (stat)
            return stat;

      stat = fc_parse_wwn(&buf[17], &wwnn);
      if (stat)
            return stat;

      spin_lock_irqsave(shost->host_lock, flags);
      match = 0;
      /* we only allow support on Channel 0 !!! */
      list_for_each_entry(vport, &fc_host->vports, peers) {
            if ((vport->channel == 0) &&
                (vport->port_name == wwpn) && (vport->node_name == wwnn)) {
                  match = 1;
                  break;
            }
      }
      spin_unlock_irqrestore(shost->host_lock, flags);

      if (!match)
            return -ENODEV;

      stat = fc_vport_terminate(vport);
      return stat ? stat : count;
}
static FC_DEVICE_ATTR(host, vport_delete, S_IWUSR, NULL,
                  store_fc_host_vport_delete);


static int fc_host_match(struct attribute_container *cont,
                    struct device *dev)
{
      struct Scsi_Host *shost;
      struct fc_internal *i;

      if (!scsi_is_host_device(dev))
            return 0;

      shost = dev_to_shost(dev);
      if (!shost->transportt  || shost->transportt->host_attrs.ac.class
          != &fc_host_class.class)
            return 0;

      i = to_fc_internal(shost->transportt);

      return &i->t.host_attrs.ac == cont;
}

static int fc_target_match(struct attribute_container *cont,
                      struct device *dev)
{
      struct Scsi_Host *shost;
      struct fc_internal *i;

      if (!scsi_is_target_device(dev))
            return 0;

      shost = dev_to_shost(dev->parent);
      if (!shost->transportt  || shost->transportt->host_attrs.ac.class
          != &fc_host_class.class)
            return 0;

      i = to_fc_internal(shost->transportt);

      return &i->t.target_attrs.ac == cont;
}

static void fc_rport_dev_release(struct device *dev)
{
      struct fc_rport *rport = dev_to_rport(dev);
      put_device(dev->parent);
      kfree(rport);
}

int scsi_is_fc_rport(const struct device *dev)
{
      return dev->release == fc_rport_dev_release;
}
EXPORT_SYMBOL(scsi_is_fc_rport);

static int fc_rport_match(struct attribute_container *cont,
                      struct device *dev)
{
      struct Scsi_Host *shost;
      struct fc_internal *i;

      if (!scsi_is_fc_rport(dev))
            return 0;

      shost = dev_to_shost(dev->parent);
      if (!shost->transportt  || shost->transportt->host_attrs.ac.class
          != &fc_host_class.class)
            return 0;

      i = to_fc_internal(shost->transportt);

      return &i->rport_attr_cont.ac == cont;
}


static void fc_vport_dev_release(struct device *dev)
{
      struct fc_vport *vport = dev_to_vport(dev);
      put_device(dev->parent);            /* release kobj parent */
      kfree(vport);
}

int scsi_is_fc_vport(const struct device *dev)
{
      return dev->release == fc_vport_dev_release;
}
EXPORT_SYMBOL(scsi_is_fc_vport);

static int fc_vport_match(struct attribute_container *cont,
                      struct device *dev)
{
      struct fc_vport *vport;
      struct Scsi_Host *shost;
      struct fc_internal *i;

      if (!scsi_is_fc_vport(dev))
            return 0;
      vport = dev_to_vport(dev);

      shost = vport_to_shost(vport);
      if (!shost->transportt  || shost->transportt->host_attrs.ac.class
          != &fc_host_class.class)
            return 0;

      i = to_fc_internal(shost->transportt);
      return &i->vport_attr_cont.ac == cont;
}


/**
 * fc_timed_out - FC Transport I/O timeout intercept handler
 * @scmd:   The SCSI command which timed out
 *
 * This routine protects against error handlers getting invoked while a
 * rport is in a blocked state, typically due to a temporarily loss of
 * connectivity. If the error handlers are allowed to proceed, requests
 * to abort i/o, reset the target, etc will likely fail as there is no way
 * to communicate with the device to perform the requested function. These
 * failures may result in the midlayer taking the device offline, requiring
 * manual intervention to restore operation.
 *
 * This routine, called whenever an i/o times out, validates the state of
 * the underlying rport. If the rport is blocked, it returns
 * EH_RESET_TIMER, which will continue to reschedule the timeout.
 * Eventually, either the device will return, or devloss_tmo will fire,
 * and when the timeout then fires, it will be handled normally.
 * If the rport is not blocked, normal error handling continues.
 *
 * Notes:
 *    This routine assumes no locks are held on entry.
 */
static enum blk_eh_timer_return
fc_timed_out(struct scsi_cmnd *scmd)
{
      struct fc_rport *rport = starget_to_rport(scsi_target(scmd->device));

      if (rport->port_state == FC_PORTSTATE_BLOCKED)
            return BLK_EH_RESET_TIMER;

      return BLK_EH_NOT_HANDLED;
}

/*
 * Called by fc_user_scan to locate an rport on the shost that
 * matches the channel and target id, and invoke scsi_scan_target()
 * on the rport.
 */
static void
fc_user_scan_tgt(struct Scsi_Host *shost, uint channel, uint id, uint lun)
{
      struct fc_rport *rport;
      unsigned long flags;

      spin_lock_irqsave(shost->host_lock, flags);

      list_for_each_entry(rport, &fc_host_rports(shost), peers) {
            if (rport->scsi_target_id == -1)
                  continue;

            if (rport->port_state != FC_PORTSTATE_ONLINE)
                  continue;

            if ((channel == rport->channel) &&
                (id == rport->scsi_target_id)) {
                  spin_unlock_irqrestore(shost->host_lock, flags);
                  scsi_scan_target(&rport->dev, channel, id, lun, 1);
                  return;
            }
      }

      spin_unlock_irqrestore(shost->host_lock, flags);
}

/*
 * Called via sysfs scan routines. Necessary, as the FC transport
 * wants to place all target objects below the rport object. So this
 * routine must invoke the scsi_scan_target() routine with the rport
 * object as the parent.
 */
static int
fc_user_scan(struct Scsi_Host *shost, uint channel, uint id, uint lun)
{
      uint chlo, chhi;
      uint tgtlo, tgthi;

      if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
          ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) ||
          ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun)))
            return -EINVAL;

      if (channel == SCAN_WILD_CARD) {
            chlo = 0;
            chhi = shost->max_channel + 1;
      } else {
            chlo = channel;
            chhi = channel + 1;
      }

      if (id == SCAN_WILD_CARD) {
            tgtlo = 0;
            tgthi = shost->max_id;
      } else {
            tgtlo = id;
            tgthi = id + 1;
      }

      for ( ; chlo < chhi; chlo++)
            for ( ; tgtlo < tgthi; tgtlo++)
                  fc_user_scan_tgt(shost, chlo, tgtlo, lun);

      return 0;
}

static int fc_tsk_mgmt_response(struct Scsi_Host *shost, u64 nexus, u64 tm_id,
                        int result)
{
      struct fc_internal *i = to_fc_internal(shost->transportt);
      return i->f->tsk_mgmt_response(shost, nexus, tm_id, result);
}

static int fc_it_nexus_response(struct Scsi_Host *shost, u64 nexus, int result)
{
      struct fc_internal *i = to_fc_internal(shost->transportt);
      return i->f->it_nexus_response(shost, nexus, result);
}

struct scsi_transport_template *
fc_attach_transport(struct fc_function_template *ft)
{
      int count;
      struct fc_internal *i = kzalloc(sizeof(struct fc_internal),
                              GFP_KERNEL);

      if (unlikely(!i))
            return NULL;

      i->t.target_attrs.ac.attrs = &i->starget_attrs[0];
      i->t.target_attrs.ac.class = &fc_transport_class.class;
      i->t.target_attrs.ac.match = fc_target_match;
      i->t.target_size = sizeof(struct fc_starget_attrs);
      transport_container_register(&i->t.target_attrs);

      i->t.host_attrs.ac.attrs = &i->host_attrs[0];
      i->t.host_attrs.ac.class = &fc_host_class.class;
      i->t.host_attrs.ac.match = fc_host_match;
      i->t.host_size = sizeof(struct fc_host_attrs);
      if (ft->get_fc_host_stats)
            i->t.host_attrs.statistics = &fc_statistics_group;
      transport_container_register(&i->t.host_attrs);

      i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];
      i->rport_attr_cont.ac.class = &fc_rport_class.class;
      i->rport_attr_cont.ac.match = fc_rport_match;
      transport_container_register(&i->rport_attr_cont);

      i->vport_attr_cont.ac.attrs = &i->vport_attrs[0];
      i->vport_attr_cont.ac.class = &fc_vport_class.class;
      i->vport_attr_cont.ac.match = fc_vport_match;
      transport_container_register(&i->vport_attr_cont);

      i->f = ft;

      /* Transport uses the shost workq for scsi scanning */
      i->t.create_work_queue = 1;

      i->t.eh_timed_out = fc_timed_out;

      i->t.user_scan = fc_user_scan;

      /* target-mode drivers' functions */
      i->t.tsk_mgmt_response = fc_tsk_mgmt_response;
      i->t.it_nexus_response = fc_it_nexus_response;

      /*
       * Setup SCSI Target Attributes.
       */
      count = 0;
      SETUP_STARGET_ATTRIBUTE_RD(node_name);
      SETUP_STARGET_ATTRIBUTE_RD(port_name);
      SETUP_STARGET_ATTRIBUTE_RD(port_id);

      BUG_ON(count > FC_STARGET_NUM_ATTRS);

      i->starget_attrs[count] = NULL;


      /*
       * Setup SCSI Host Attributes.
       */
      count=0;
      SETUP_HOST_ATTRIBUTE_RD(node_name);
      SETUP_HOST_ATTRIBUTE_RD(port_name);
      SETUP_HOST_ATTRIBUTE_RD(permanent_port_name);
      SETUP_HOST_ATTRIBUTE_RD(supported_classes);
      SETUP_HOST_ATTRIBUTE_RD(supported_fc4s);
      SETUP_HOST_ATTRIBUTE_RD(supported_speeds);
      SETUP_HOST_ATTRIBUTE_RD(maxframe_size);
      if (ft->vport_create) {
            SETUP_HOST_ATTRIBUTE_RD_NS(max_npiv_vports);
            SETUP_HOST_ATTRIBUTE_RD_NS(npiv_vports_inuse);
      }
      SETUP_HOST_ATTRIBUTE_RD(serial_number);

      SETUP_HOST_ATTRIBUTE_RD(port_id);
      SETUP_HOST_ATTRIBUTE_RD(port_type);
      SETUP_HOST_ATTRIBUTE_RD(port_state);
      SETUP_HOST_ATTRIBUTE_RD(active_fc4s);
      SETUP_HOST_ATTRIBUTE_RD(speed);
      SETUP_HOST_ATTRIBUTE_RD(fabric_name);
      SETUP_HOST_ATTRIBUTE_RD(symbolic_name);
      SETUP_HOST_ATTRIBUTE_RW(system_hostname);

      /* Transport-managed attributes */
      SETUP_PRIVATE_HOST_ATTRIBUTE_RW(tgtid_bind_type);
      if (ft->issue_fc_host_lip)
            SETUP_PRIVATE_HOST_ATTRIBUTE_RW(issue_lip);
      if (ft->vport_create)
            SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_create);
      if (ft->vport_delete)
            SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_delete);

      BUG_ON(count > FC_HOST_NUM_ATTRS);

      i->host_attrs[count] = NULL;

      /*
       * Setup Remote Port Attributes.
       */
      count=0;
      SETUP_RPORT_ATTRIBUTE_RD(maxframe_size);
      SETUP_RPORT_ATTRIBUTE_RD(supported_classes);
      SETUP_RPORT_ATTRIBUTE_RW(dev_loss_tmo);
      SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(node_name);
      SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_name);
      SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_id);
      SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(roles);
      SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_state);
      SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(scsi_target_id);
      SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(fast_io_fail_tmo);

      BUG_ON(count > FC_RPORT_NUM_ATTRS);

      i->rport_attrs[count] = NULL;

      /*
       * Setup Virtual Port Attributes.
       */
      count=0;
      SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_state);
      SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_last_state);
      SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(node_name);
      SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(port_name);
      SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(roles);
      SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_type);
      SETUP_VPORT_ATTRIBUTE_RW(symbolic_name);
      SETUP_VPORT_ATTRIBUTE_WR(vport_delete);
      SETUP_VPORT_ATTRIBUTE_WR(vport_disable);

      BUG_ON(count > FC_VPORT_NUM_ATTRS);

      i->vport_attrs[count] = NULL;

      return &i->t;
}
EXPORT_SYMBOL(fc_attach_transport);

void fc_release_transport(struct scsi_transport_template *t)
{
      struct fc_internal *i = to_fc_internal(t);

      transport_container_unregister(&i->t.target_attrs);
      transport_container_unregister(&i->t.host_attrs);
      transport_container_unregister(&i->rport_attr_cont);
      transport_container_unregister(&i->vport_attr_cont);

      kfree(i);
}
EXPORT_SYMBOL(fc_release_transport);

/**
 * fc_queue_work - Queue work to the fc_host workqueue.
 * @shost:  Pointer to Scsi_Host bound to fc_host.
 * @work:   Work to queue for execution.
 *
 * Return value:
 *    1 - work queued for execution
 *    0 - work is already queued
 *    -EINVAL - work queue doesn't exist
 */
static int
fc_queue_work(struct Scsi_Host *shost, struct work_struct *work)
{
      if (unlikely(!fc_host_work_q(shost))) {
            printk(KERN_ERR
                  "ERROR: FC host '%s' attempted to queue work, "
                  "when no workqueue created.\n", shost->hostt->name);
            dump_stack();

            return -EINVAL;
      }

      return queue_work(fc_host_work_q(shost), work);
}

/**
 * fc_flush_work - Flush a fc_host's workqueue.
 * @shost:  Pointer to Scsi_Host bound to fc_host.
 */
static void
fc_flush_work(struct Scsi_Host *shost)
{
      if (!fc_host_work_q(shost)) {
            printk(KERN_ERR
                  "ERROR: FC host '%s' attempted to flush work, "
                  "when no workqueue created.\n", shost->hostt->name);
            dump_stack();
            return;
      }

      flush_workqueue(fc_host_work_q(shost));
}

/**
 * fc_queue_devloss_work - Schedule work for the fc_host devloss workqueue.
 * @shost:  Pointer to Scsi_Host bound to fc_host.
 * @work:   Work to queue for execution.
 * @delay:  jiffies to delay the work queuing
 *
 * Return value:
 *    1 on success / 0 already queued / < 0 for error
 */
static int
fc_queue_devloss_work(struct Scsi_Host *shost, struct delayed_work *work,
                        unsigned long delay)
{
      if (unlikely(!fc_host_devloss_work_q(shost))) {
            printk(KERN_ERR
                  "ERROR: FC host '%s' attempted to queue work, "
                  "when no workqueue created.\n", shost->hostt->name);
            dump_stack();

            return -EINVAL;
      }

      return queue_delayed_work(fc_host_devloss_work_q(shost), work, delay);
}

/**
 * fc_flush_devloss - Flush a fc_host's devloss workqueue.
 * @shost:  Pointer to Scsi_Host bound to fc_host.
 */
static void
fc_flush_devloss(struct Scsi_Host *shost)
{
      if (!fc_host_devloss_work_q(shost)) {
            printk(KERN_ERR
                  "ERROR: FC host '%s' attempted to flush work, "
                  "when no workqueue created.\n", shost->hostt->name);
            dump_stack();
            return;
      }

      flush_workqueue(fc_host_devloss_work_q(shost));
}


/**
 * fc_remove_host - called to terminate any fc_transport-related elements for a scsi host.
 * @shost:  Which &Scsi_Host
 *
 * This routine is expected to be called immediately preceeding the
 * a driver's call to scsi_remove_host().
 *
 * WARNING: A driver utilizing the fc_transport, which fails to call
 *   this routine prior to scsi_remove_host(), will leave dangling
 *   objects in /sys/class/fc_remote_ports. Access to any of these
 *   objects can result in a system crash !!!
 *
 * Notes:
 *    This routine assumes no locks are held on entry.
 */
void
fc_remove_host(struct Scsi_Host *shost)
{
      struct fc_vport *vport = NULL, *next_vport = NULL;
      struct fc_rport *rport = NULL, *next_rport = NULL;
      struct workqueue_struct *work_q;
      struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
      unsigned long flags;

      spin_lock_irqsave(shost->host_lock, flags);

      /* Remove any vports */
      list_for_each_entry_safe(vport, next_vport, &fc_host->vports, peers)
            fc_queue_work(shost, &vport->vport_delete_work);

      /* Remove any remote ports */
      list_for_each_entry_safe(rport, next_rport,
                  &fc_host->rports, peers) {
            list_del(&rport->peers);
            rport->port_state = FC_PORTSTATE_DELETED;
            fc_queue_work(shost, &rport->rport_delete_work);
      }

      list_for_each_entry_safe(rport, next_rport,
                  &fc_host->rport_bindings, peers) {
            list_del(&rport->peers);
            rport->port_state = FC_PORTSTATE_DELETED;
            fc_queue_work(shost, &rport->rport_delete_work);
      }

      spin_unlock_irqrestore(shost->host_lock, flags);

      /* flush all scan work items */
      scsi_flush_work(shost);

      /* flush all stgt delete, and rport delete work items, then kill it  */
      if (fc_host->work_q) {
            work_q = fc_host->work_q;
            fc_host->work_q = NULL;
            destroy_workqueue(work_q);
      }

      /* flush all devloss work items, then kill it  */
      if (fc_host->devloss_work_q) {
            work_q = fc_host->devloss_work_q;
            fc_host->devloss_work_q = NULL;
            destroy_workqueue(work_q);
      }
}
EXPORT_SYMBOL(fc_remove_host);

static void fc_terminate_rport_io(struct fc_rport *rport)
{
      struct Scsi_Host *shost = rport_to_shost(rport);
      struct fc_internal *i = to_fc_internal(shost->transportt);

      /* Involve the LLDD if possible to terminate all io on the rport. */
      if (i->f->terminate_rport_io)
            i->f->terminate_rport_io(rport);

      /*
       * must unblock to flush queued IO. The caller will have set
       * the port_state or flags, so that fc_remote_port_chkready will
       * fail IO.
       */
      scsi_target_unblock(&rport->dev);
}

/**
 * fc_starget_delete - called to delete the scsi decendents of an rport
 * @work:   remote port to be operated on.
 *
 * Deletes target and all sdevs.
 */
static void
fc_starget_delete(struct work_struct *work)
{
      struct fc_rport *rport =
            container_of(work, struct fc_rport, stgt_delete_work);

      fc_terminate_rport_io(rport);
      scsi_remove_target(&rport->dev);
}


/**
 * fc_rport_final_delete - finish rport termination and delete it.
 * @work:   remote port to be deleted.
 */
static void
fc_rport_final_delete(struct work_struct *work)
{
      struct fc_rport *rport =
            container_of(work, struct fc_rport, rport_delete_work);
      struct device *dev = &rport->dev;
      struct Scsi_Host *shost = rport_to_shost(rport);
      struct fc_internal *i = to_fc_internal(shost->transportt);
      unsigned long flags;

      /*
       * if a scan is pending, flush the SCSI Host work_q so that
       * that we can reclaim the rport scan work element.
       */
      if (rport->flags & FC_RPORT_SCAN_PENDING)
            scsi_flush_work(shost);

      fc_terminate_rport_io(rport);

      /*
       * Cancel any outstanding timers. These should really exist
       * only when rmmod'ing the LLDD and we're asking for
       * immediate termination of the rports
       */
      spin_lock_irqsave(shost->host_lock, flags);
      if (rport->flags & FC_RPORT_DEVLOSS_PENDING) {
            spin_unlock_irqrestore(shost->host_lock, flags);
            if (!cancel_delayed_work(&rport->fail_io_work))
                  fc_flush_devloss(shost);
            if (!cancel_delayed_work(&rport->dev_loss_work))
                  fc_flush_devloss(shost);
            spin_lock_irqsave(shost->host_lock, flags);
            rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
      }
      spin_unlock_irqrestore(shost->host_lock, flags);

      /* Delete SCSI target and sdevs */
      if (rport->scsi_target_id != -1)
            fc_starget_delete(&rport->stgt_delete_work);

      /*
       * Notify the driver that the rport is now dead. The LLDD will
       * also guarantee that any communication to the rport is terminated
       *
       * Avoid this call if we already called it when we preserved the
       * rport for the binding.
       */
      if (!(rport->flags & FC_RPORT_DEVLOSS_CALLBK_DONE) &&
          (i->f->dev_loss_tmo_callbk))
            i->f->dev_loss_tmo_callbk(rport);

      fc_bsg_remove(rport->rqst_q);

      transport_remove_device(dev);
      device_del(dev);
      transport_destroy_device(dev);
      put_device(&shost->shost_gendev);   /* for fc_host->rport list */
      put_device(dev);              /* for self-reference */
}


/**
 * fc_rport_create - allocates and creates a remote FC port.
 * @shost:  scsi host the remote port is connected to.
 * @channel:      Channel on shost port connected to.
 * @ids:    The world wide names, fc address, and FC4 port
 *          roles for the remote port.
 *
 * Allocates and creates the remoter port structure, including the
 * class and sysfs creation.
 *
 * Notes:
 *    This routine assumes no locks are held on entry.
 */
static struct fc_rport *
fc_rport_create(struct Scsi_Host *shost, int channel,
      struct fc_rport_identifiers  *ids)
{
      struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
      struct fc_internal *fci = to_fc_internal(shost->transportt);
      struct fc_rport *rport;
      struct device *dev;
      unsigned long flags;
      int error;
      size_t size;

      size = (sizeof(struct fc_rport) + fci->f->dd_fcrport_size);
      rport = kzalloc(size, GFP_KERNEL);
      if (unlikely(!rport)) {
            printk(KERN_ERR "%s: allocation failure\n", __func__);
            return NULL;
      }

      rport->maxframe_size = -1;
      rport->supported_classes = FC_COS_UNSPECIFIED;
      rport->dev_loss_tmo = fc_dev_loss_tmo;
      memcpy(&rport->node_name, &ids->node_name, sizeof(rport->node_name));
      memcpy(&rport->port_name, &ids->port_name, sizeof(rport->port_name));
      rport->port_id = ids->port_id;
      rport->roles = ids->roles;
      rport->port_state = FC_PORTSTATE_ONLINE;
      if (fci->f->dd_fcrport_size)
            rport->dd_data = &rport[1];
      rport->channel = channel;
      rport->fast_io_fail_tmo = -1;

      INIT_DELAYED_WORK(&rport->dev_loss_work, fc_timeout_deleted_rport);
      INIT_DELAYED_WORK(&rport->fail_io_work, fc_timeout_fail_rport_io);
      INIT_WORK(&rport->scan_work, fc_scsi_scan_rport);
      INIT_WORK(&rport->stgt_delete_work, fc_starget_delete);
      INIT_WORK(&rport->rport_delete_work, fc_rport_final_delete);

      spin_lock_irqsave(shost->host_lock, flags);

      rport->number = fc_host->next_rport_number++;
      if (rport->roles & FC_PORT_ROLE_FCP_TARGET)
            rport->scsi_target_id = fc_host->next_target_id++;
      else
            rport->scsi_target_id = -1;
      list_add_tail(&rport->peers, &fc_host->rports);
      get_device(&shost->shost_gendev);   /* for fc_host->rport list */

      spin_unlock_irqrestore(shost->host_lock, flags);

      dev = &rport->dev;
      device_initialize(dev);             /* takes self reference */
      dev->parent = get_device(&shost->shost_gendev); /* parent reference */
      dev->release = fc_rport_dev_release;
      dev_set_name(dev, "rport-%d:%d-%d",
                 shost->host_no, channel, rport->number);
      transport_setup_device(dev);

      error = device_add(dev);
      if (error) {
            printk(KERN_ERR "FC Remote Port device_add failed\n");
            goto delete_rport;
      }
      transport_add_device(dev);
      transport_configure_device(dev);

      fc_bsg_rportadd(shost, rport);
      /* ignore any bsg add error - we just can't do sgio */

      if (rport->roles & FC_PORT_ROLE_FCP_TARGET) {
            /* initiate a scan of the target */
            rport->flags |= FC_RPORT_SCAN_PENDING;
            scsi_queue_work(shost, &rport->scan_work);
      }

      return rport;

delete_rport:
      transport_destroy_device(dev);
      spin_lock_irqsave(shost->host_lock, flags);
      list_del(&rport->peers);
      put_device(&shost->shost_gendev);   /* for fc_host->rport list */
      spin_unlock_irqrestore(shost->host_lock, flags);
      put_device(dev->parent);
      kfree(rport);
      return NULL;
}

/**
 * fc_remote_port_add - notify fc transport of the existence of a remote FC port.
 * @shost:  scsi host the remote port is connected to.
 * @channel:      Channel on shost port connected to.
 * @ids:    The world wide names, fc address, and FC4 port
 *          roles for the remote port.
 *
 * The LLDD calls this routine to notify the transport of the existence
 * of a remote port. The LLDD provides the unique identifiers (wwpn,wwn)
 * of the port, it's FC address (port_id), and the FC4 roles that are
 * active for the port.
 *
 * For ports that are FCP targets (aka scsi targets), the FC transport
 * maintains consistent target id bindings on behalf of the LLDD.
 * A consistent target id binding is an assignment of a target id to
 * a remote port identifier, which persists while the scsi host is
 * attached. The remote port can disappear, then later reappear, and
 * it's target id assignment remains the same. This allows for shifts
 * in FC addressing (if binding by wwpn or wwnn) with no apparent
 * changes to the scsi subsystem which is based on scsi host number and
 * target id values.  Bindings are only valid during the attachment of
 * the scsi host. If the host detaches, then later re-attaches, target
 * id bindings may change.
 *
 * This routine is responsible for returning a remote port structure.
 * The routine will search the list of remote ports it maintains
 * internally on behalf of consistent target id mappings. If found, the
 * remote port structure will be reused. Otherwise, a new remote port
 * structure will be allocated.
 *
 * Whenever a remote port is allocated, a new fc_remote_port class
 * device is created.
 *
 * Should not be called from interrupt context.
 *
 * Notes:
 *    This routine assumes no locks are held on entry.
 */
struct fc_rport *
fc_remote_port_add(struct Scsi_Host *shost, int channel,
      struct fc_rport_identifiers  *ids)
{
      struct fc_internal *fci = to_fc_internal(shost->transportt);
      struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
      struct fc_rport *rport;
      unsigned long flags;
      int match = 0;

      /* ensure any stgt delete functions are done */
      fc_flush_work(shost);

      /*
       * Search the list of "active" rports, for an rport that has been
       * deleted, but we've held off the real delete while the target
       * is in a "blocked" state.
       */
      spin_lock_irqsave(shost->host_lock, flags);

      list_for_each_entry(rport, &fc_host->rports, peers) {

            if ((rport->port_state == FC_PORTSTATE_BLOCKED) &&
                  (rport->channel == channel)) {

                  switch (fc_host->tgtid_bind_type) {
                  case FC_TGTID_BIND_BY_WWPN:
                  case FC_TGTID_BIND_NONE:
                        if (rport->port_name == ids->port_name)
                              match = 1;
                        break;
                  case FC_TGTID_BIND_BY_WWNN:
                        if (rport->node_name == ids->node_name)
                              match = 1;
                        break;
                  case FC_TGTID_BIND_BY_ID:
                        if (rport->port_id == ids->port_id)
                              match = 1;
                        break;
                  }

                  if (match) {

                        memcpy(&rport->node_name, &ids->node_name,
                              sizeof(rport->node_name));
                        memcpy(&rport->port_name, &ids->port_name,
                              sizeof(rport->port_name));
                        rport->port_id = ids->port_id;

                        rport->port_state = FC_PORTSTATE_ONLINE;
                        rport->roles = ids->roles;

                        spin_unlock_irqrestore(shost->host_lock, flags);

                        if (fci->f->dd_fcrport_size)
                              memset(rport->dd_data, 0,
                                    fci->f->dd_fcrport_size);

                        /*
                         * If we were not a target, cancel the
                         * io terminate and rport timers, and
                         * we're done.
                         *
                         * If we were a target, but our new role
                         * doesn't indicate a target, leave the
                         * timers running expecting the role to
                         * change as the target fully logs in. If
                         * it doesn't, the target will be torn down.
                         *
                         * If we were a target, and our role shows
                         * we're still a target, cancel the timers
                         * and kick off a scan.
                         */

                        /* was a target, not in roles */
                        if ((rport->scsi_target_id != -1) &&
                            (!(ids->roles & FC_PORT_ROLE_FCP_TARGET)))
                              return rport;

                        /*
                         * Stop the fail io and dev_loss timers.
                         * If they flush, the port_state will
                         * be checked and will NOOP the function.
                         */
                        if (!cancel_delayed_work(&rport->fail_io_work))
                              fc_flush_devloss(shost);
                        if (!cancel_delayed_work(&rport->dev_loss_work))
                              fc_flush_devloss(shost);

                        spin_lock_irqsave(shost->host_lock, flags);

                        rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
                                      FC_RPORT_DEVLOSS_PENDING |
                                      FC_RPORT_DEVLOSS_CALLBK_DONE);

                        /* if target, initiate a scan */
                        if (rport->scsi_target_id != -1) {
                              rport->flags |= FC_RPORT_SCAN_PENDING;
                              scsi_queue_work(shost,
                                          &rport->scan_work);
                              spin_unlock_irqrestore(shost->host_lock,
                                          flags);
                              scsi_target_unblock(&rport->dev);
                        } else
                              spin_unlock_irqrestore(shost->host_lock,
                                          flags);

                        fc_bsg_goose_queue(rport);

                        return rport;
                  }
            }
      }

      /*
       * Search the bindings array
       * Note: if never a FCP target, you won't be on this list
       */
      if (fc_host->tgtid_bind_type != FC_TGTID_BIND_NONE) {

            /* search for a matching consistent binding */

            list_for_each_entry(rport, &fc_host->rport_bindings,
                              peers) {
                  if (rport->channel != channel)
                        continue;

                  switch (fc_host->tgtid_bind_type) {
                  case FC_TGTID_BIND_BY_WWPN:
                        if (rport->port_name == ids->port_name)
                              match = 1;
                        break;
                  case FC_TGTID_BIND_BY_WWNN:
                        if (rport->node_name == ids->node_name)
                              match = 1;
                        break;
                  case FC_TGTID_BIND_BY_ID:
                        if (rport->port_id == ids->port_id)
                              match = 1;
                        break;
                  case FC_TGTID_BIND_NONE: /* to keep compiler happy */
                        break;
                  }

                  if (match) {
                        list_move_tail(&rport->peers, &fc_host->rports);
                        break;
                  }
            }

            if (match) {
                  memcpy(&rport->node_name, &ids->node_name,
                        sizeof(rport->node_name));
                  memcpy(&rport->port_name, &ids->port_name,
                        sizeof(rport->port_name));
                  rport->port_id = ids->port_id;
                  rport->roles = ids->roles;
                  rport->port_state = FC_PORTSTATE_ONLINE;
                  rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;

                  if (fci->f->dd_fcrport_size)
                        memset(rport->dd_data, 0,
                                    fci->f->dd_fcrport_size);

                  if (rport->roles & FC_PORT_ROLE_FCP_TARGET) {
                        /* initiate a scan of the target */
                        rport->flags |= FC_RPORT_SCAN_PENDING;
                        scsi_queue_work(shost, &rport->scan_work);
                        spin_unlock_irqrestore(shost->host_lock, flags);
                        scsi_target_unblock(&rport->dev);
                  } else
                        spin_unlock_irqrestore(shost->host_lock, flags);

                  return rport;
            }
      }

      spin_unlock_irqrestore(shost->host_lock, flags);

      /* No consistent binding found - create new remote port entry */
      rport = fc_rport_create(shost, channel, ids);

      return rport;
}
EXPORT_SYMBOL(fc_remote_port_add);


/**
 * fc_remote_port_delete - notifies the fc transport that a remote port is no longer in existence.
 * @rport:  The remote port that no longer exists
 *
 * The LLDD calls this routine to notify the transport that a remote
 * port is no longer part of the topology. Note: Although a port
 * may no longer be part of the topology, it may persist in the remote
 * ports displayed by the fc_host. We do this under 2 conditions:
 * 1) If the port was a scsi target, we delay its deletion by "blocking" it.
 *   This allows the port to temporarily disappear, then reappear without
 *   disrupting the SCSI device tree attached to it. During the "blocked"
 *   period the port will still exist.
 * 2) If the port was a scsi target and disappears for longer than we
 *   expect, we'll delete the port and the tear down the SCSI device tree
 *   attached to it. However, we want to semi-persist the target id assigned
 *   to that port if it eventually does exist. The port structure will
 *   remain (although with minimal information) so that the target id
 *   bindings remails.
 *
 * If the remote port is not an FCP Target, it will be fully torn down
 * and deallocated, including the fc_remote_port class device.
 *
 * If the remote port is an FCP Target, the port will be placed in a
 * temporary blocked state. From the LLDD's perspective, the rport no
 * longer exists. From the SCSI midlayer's perspective, the SCSI target
 * exists, but all sdevs on it are blocked from further I/O. The following
 * is then expected.
 *
 *   If the remote port does not return (signaled by a LLDD call to
 *   fc_remote_port_add()) within the dev_loss_tmo timeout, then the
 *   scsi target is removed - killing all outstanding i/o and removing the
 *   scsi devices attached ot it. The port structure will be marked Not
 *   Present and be partially cleared, leaving only enough information to
 *   recognize the remote port relative to the scsi target id binding if
 *   it later appears.  The port will remain as long as there is a valid
 *   binding (e.g. until the user changes the binding type or unloads the
 *   scsi host with the binding).
 *
 *   If the remote port returns within the dev_loss_tmo value (and matches
 *   according to the target id binding type), the port structure will be
 *   reused. If it is no longer a SCSI target, the target will be torn
 *   down. If it continues to be a SCSI target, then the target will be
 *   unblocked (allowing i/o to be resumed), and a scan will be activated
 *   to ensure that all luns are detected.
 *
 * Called from normal process context only - cannot be called from interrupt.
 *
 * Notes:
 *    This routine assumes no locks are held on entry.
 */
void
fc_remote_port_delete(struct fc_rport  *rport)
{
      struct Scsi_Host *shost = rport_to_shost(rport);
      int timeout = rport->dev_loss_tmo;
      unsigned long flags;

      /*
       * No need to flush the fc_host work_q's, as all adds are synchronous.
       *
       * We do need to reclaim the rport scan work element, so eventually
       * (in fc_rport_final_delete()) we'll flush the scsi host work_q if
       * there's still a scan pending.
       */

      spin_lock_irqsave(shost->host_lock, flags);

      if (rport->port_state != FC_PORTSTATE_ONLINE) {
            spin_unlock_irqrestore(shost->host_lock, flags);
            return;
      }

      /*
       * In the past, we if this was not an FCP-Target, we would
       * unconditionally just jump to deleting the rport.
       * However, rports can be used as node containers by the LLDD,
       * and its not appropriate to just terminate the rport at the
       * first sign of a loss in connectivity. The LLDD may want to
       * send ELS traffic to re-validate the login. If the rport is
       * immediately deleted, it makes it inappropriate for a node
       * container.
       * So... we now unconditionally wait dev_loss_tmo before
       * destroying an rport.
       */

      rport->port_state = FC_PORTSTATE_BLOCKED;

      rport->flags |= FC_RPORT_DEVLOSS_PENDING;

      spin_unlock_irqrestore(shost->host_lock, flags);

      if (rport->roles & FC_PORT_ROLE_FCP_INITIATOR &&
          shost->active_mode & MODE_TARGET)
            fc_tgt_it_nexus_destroy(shost, (unsigned long)rport);

      scsi_target_block(&rport->dev);

      /* see if we need to kill io faster than waiting for device loss */
      if ((rport->fast_io_fail_tmo != -1) &&
          (rport->fast_io_fail_tmo < timeout))
            fc_queue_devloss_work(shost, &rport->fail_io_work,
                              rport->fast_io_fail_tmo * HZ);

      /* cap the length the devices can be blocked until they are deleted */
      fc_queue_devloss_work(shost, &rport->dev_loss_work, timeout * HZ);
}
EXPORT_SYMBOL(fc_remote_port_delete);

/**
 * fc_remote_port_rolechg - notifies the fc transport that the roles on a remote may have changed.
 * @rport:  The remote port that changed.
 * @roles:      New roles for this port.
 *
 * Description: The LLDD calls this routine to notify the transport that the
 * roles on a remote port may have changed. The largest effect of this is
 * if a port now becomes a FCP Target, it must be allocated a
 * scsi target id.  If the port is no longer a FCP target, any
 * scsi target id value assigned to it will persist in case the
 * role changes back to include FCP Target. No changes in the scsi
 * midlayer will be invoked if the role changes (in the expectation
 * that the role will be resumed. If it doesn't normal error processing
 * will take place).
 *
 * Should not be called from interrupt context.
 *
 * Notes:
 *    This routine assumes no locks are held on entry.
 */
void
fc_remote_port_rolechg(struct fc_rport  *rport, u32 roles)
{
      struct Scsi_Host *shost = rport_to_shost(rport);
      struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
      unsigned long flags;
      int create = 0;
      int ret;

      spin_lock_irqsave(shost->host_lock, flags);
      if (roles & FC_PORT_ROLE_FCP_TARGET) {
            if (rport->scsi_target_id == -1) {
                  rport->scsi_target_id = fc_host->next_target_id++;
                  create = 1;
            } else if (!(rport->roles & FC_PORT_ROLE_FCP_TARGET))
                  create = 1;
      } else if (shost->active_mode & MODE_TARGET) {
            ret = fc_tgt_it_nexus_create(shost, (unsigned long)rport,
                                   (char *)&rport->node_name);
            if (ret)
                  printk(KERN_ERR "FC Remore Port tgt nexus failed %d\n",
                         ret);
      }

      rport->roles = roles;

      spin_unlock_irqrestore(shost->host_lock, flags);

      if (create) {
            /*
             * There may have been a delete timer running on the
             * port. Ensure that it is cancelled as we now know
             * the port is an FCP Target.
             * Note: we know the rport is exists and in an online
             *  state as the LLDD would not have had an rport
             *  reference to pass us.
             *
             * Take no action on the del_timer failure as the state
             * machine state change will validate the
             * transaction.
             */
            if (!cancel_delayed_work(&rport->fail_io_work))
                  fc_flush_devloss(shost);
            if (!cancel_delayed_work(&rport->dev_loss_work))
                  fc_flush_devloss(shost);

            spin_lock_irqsave(shost->host_lock, flags);
            rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
                          FC_RPORT_DEVLOSS_PENDING);
            spin_unlock_irqrestore(shost->host_lock, flags);

            /* ensure any stgt delete functions are done */
            fc_flush_work(shost);

            /* initiate a scan of the target */
            spin_lock_irqsave(shost->host_lock, flags);
            rport->flags |= FC_RPORT_SCAN_PENDING;
            scsi_queue_work(shost, &rport->scan_work);
            spin_unlock_irqrestore(shost->host_lock, flags);
            scsi_target_unblock(&rport->dev);
      }
}
EXPORT_SYMBOL(fc_remote_port_rolechg);

/**
 * fc_timeout_deleted_rport - Timeout handler for a deleted remote port.
 * @work:   rport target that failed to reappear in the allotted time.
 *
 * Description: An attempt to delete a remote port blocks, and if it fails
 *              to return in the allotted time this gets called.
 */
static void
fc_timeout_deleted_rport(struct work_struct *work)
{
      struct fc_rport *rport =
            container_of(work, struct fc_rport, dev_loss_work.work);
      struct Scsi_Host *shost = rport_to_shost(rport);
      struct fc_internal *i = to_fc_internal(shost->transportt);
      struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
      unsigned long flags;

      spin_lock_irqsave(shost->host_lock, flags);

      rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;

      /*
       * If the port is ONLINE, then it came back. If it was a SCSI
       * target, validate it still is. If not, tear down the
       * scsi_target on it.
       */
      if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
          (rport->scsi_target_id != -1) &&
          !(rport->roles & FC_PORT_ROLE_FCP_TARGET)) {
            dev_printk(KERN_ERR, &rport->dev,
                  "blocked FC remote port time out: no longer"
                  " a FCP target, removing starget\n");
            spin_unlock_irqrestore(shost->host_lock, flags);
            scsi_target_unblock(&rport->dev);
            fc_queue_work(shost, &rport->stgt_delete_work);
            return;
      }

      /* NOOP state - we're flushing workq's */
      if (rport->port_state != FC_PORTSTATE_BLOCKED) {
            spin_unlock_irqrestore(shost->host_lock, flags);
            dev_printk(KERN_ERR, &rport->dev,
                  "blocked FC remote port time out: leaving"
                  " rport%s alone\n",
                  (rport->scsi_target_id != -1) ?  " and starget" : "");
            return;
      }

      if ((fc_host->tgtid_bind_type == FC_TGTID_BIND_NONE) ||
          (rport->scsi_target_id == -1)) {
            list_del(&rport->peers);
            rport->port_state = FC_PORTSTATE_DELETED;
            dev_printk(KERN_ERR, &rport->dev,
                  "blocked FC remote port time out: removing"
                  " rport%s\n",
                  (rport->scsi_target_id != -1) ?  " and starget" : "");
            fc_queue_work(shost, &rport->rport_delete_work);
            spin_unlock_irqrestore(shost->host_lock, flags);
            return;
      }

      dev_printk(KERN_ERR, &rport->dev,
            "blocked FC remote port time out: removing target and "
            "saving binding\n");

      list_move_tail(&rport->peers, &fc_host->rport_bindings);

      /*
       * Note: We do not remove or clear the hostdata area. This allows
       *   host-specific target data to persist along with the
       *   scsi_target_id. It's up to the host to manage it's hostdata area.
       */

      /*
       * Reinitialize port attributes that may change if the port comes back.
       */
      rport->maxframe_size = -1;
      rport->supported_classes = FC_COS_UNSPECIFIED;
      rport->roles = FC_PORT_ROLE_UNKNOWN;
      rport->port_state = FC_PORTSTATE_NOTPRESENT;
      rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
      rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;

      /*
       * Pre-emptively kill I/O rather than waiting for the work queue
       * item to teardown the starget. (FCOE libFC folks prefer this
       * and to have the rport_port_id still set when it's done).
       */
      spin_unlock_irqrestore(shost->host_lock, flags);
      fc_terminate_rport_io(rport);

      BUG_ON(rport->port_state != FC_PORTSTATE_NOTPRESENT);

      /* remove the identifiers that aren't used in the consisting binding */
      switch (fc_host->tgtid_bind_type) {
      case FC_TGTID_BIND_BY_WWPN:
            rport->node_name = -1;
            rport->port_id = -1;
            break;
      case FC_TGTID_BIND_BY_WWNN:
            rport->port_name = -1;
            rport->port_id = -1;
            break;
      case FC_TGTID_BIND_BY_ID:
            rport->node_name = -1;
            rport->port_name = -1;
            break;
      case FC_TGTID_BIND_NONE:      /* to keep compiler happy */
            break;
      }

      /*
       * As this only occurs if the remote port (scsi target)
       * went away and didn't come back - we'll remove
       * all attached scsi devices.
       */
      fc_queue_work(shost, &rport->stgt_delete_work);

      /*
       * Notify the driver that the rport is now dead. The LLDD will
       * also guarantee that any communication to the rport is terminated
       *
       * Note: we set the CALLBK_DONE flag above to correspond
       */
      if (i->f->dev_loss_tmo_callbk)
            i->f->dev_loss_tmo_callbk(rport);
}


/**
 * fc_timeout_fail_rport_io - Timeout handler for a fast io failing on a disconnected SCSI target.
 * @work:   rport to terminate io on.
 *
 * Notes: Only requests the failure of the io, not that all are flushed
 *    prior to returning.
 */
static void
fc_timeout_fail_rport_io(struct work_struct *work)
{
      struct fc_rport *rport =
            container_of(work, struct fc_rport, fail_io_work.work);

      if (rport->port_state != FC_PORTSTATE_BLOCKED)
            return;

      rport->flags |= FC_RPORT_FAST_FAIL_TIMEDOUT;
      fc_terminate_rport_io(rport);
}

/**
 * fc_scsi_scan_rport - called to perform a scsi scan on a remote port.
 * @work:   remote port to be scanned.
 */
static void
fc_scsi_scan_rport(struct work_struct *work)
{
      struct fc_rport *rport =
            container_of(work, struct fc_rport, scan_work);
      struct Scsi_Host *shost = rport_to_shost(rport);
      struct fc_internal *i = to_fc_internal(shost->transportt);
      unsigned long flags;

      if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
          (rport->roles & FC_PORT_ROLE_FCP_TARGET) &&
          !(i->f->disable_target_scan)) {
            scsi_scan_target(&rport->dev, rport->channel,
                  rport->scsi_target_id, SCAN_WILD_CARD, 1);
      }

      spin_lock_irqsave(shost->host_lock, flags);
      rport->flags &= ~FC_RPORT_SCAN_PENDING;
      spin_unlock_irqrestore(shost->host_lock, flags);
}


/**
 * fc_vport_setup - allocates and creates a FC virtual port.
 * @shost:  scsi host the virtual port is connected to.
 * @channel:      Channel on shost port connected to.
 * @pdev:   parent device for vport
 * @ids:    The world wide names, FC4 port roles, etc for
 *              the virtual port.
 * @ret_vport:    The pointer to the created vport.
 *
 * Allocates and creates the vport structure, calls the parent host
 * to instantiate the vport, the completes w/ class and sysfs creation.
 *
 * Notes:
 *    This routine assumes no locks are held on entry.
 */
static int
fc_vport_setup(struct Scsi_Host *shost, int channel, struct device *pdev,
      struct fc_vport_identifiers  *ids, struct fc_vport **ret_vport)
{
      struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
      struct fc_internal *fci = to_fc_internal(shost->transportt);
      struct fc_vport *vport;
      struct device *dev;
      unsigned long flags;
      size_t size;
      int error;

      *ret_vport = NULL;

      if ( ! fci->f->vport_create)
            return -ENOENT;

      size = (sizeof(struct fc_vport) + fci->f->dd_fcvport_size);
      vport = kzalloc(size, GFP_KERNEL);
      if (unlikely(!vport)) {
            printk(KERN_ERR "%s: allocation failure\n", __func__);
            return -ENOMEM;
      }

      vport->vport_state = FC_VPORT_UNKNOWN;
      vport->vport_last_state = FC_VPORT_UNKNOWN;
      vport->node_name = ids->node_name;
      vport->port_name = ids->port_name;
      vport->roles = ids->roles;
      vport->vport_type = ids->vport_type;
      if (fci->f->dd_fcvport_size)
            vport->dd_data = &vport[1];
      vport->shost = shost;
      vport->channel = channel;
      vport->flags = FC_VPORT_CREATING;
      INIT_WORK(&vport->vport_delete_work, fc_vport_sched_delete);

      spin_lock_irqsave(shost->host_lock, flags);

      if (fc_host->npiv_vports_inuse >= fc_host->max_npiv_vports) {
            spin_unlock_irqrestore(shost->host_lock, flags);
            kfree(vport);
            return -ENOSPC;
      }
      fc_host->npiv_vports_inuse++;
      vport->number = fc_host->next_vport_number++;
      list_add_tail(&vport->peers, &fc_host->vports);
      get_device(&shost->shost_gendev);   /* for fc_host->vport list */

      spin_unlock_irqrestore(shost->host_lock, flags);

      dev = &vport->dev;
      device_initialize(dev);             /* takes self reference */
      dev->parent = get_device(pdev);           /* takes parent reference */
      dev->release = fc_vport_dev_release;
      dev_set_name(dev, "vport-%d:%d-%d",
                 shost->host_no, channel, vport->number);
      transport_setup_device(dev);

      error = device_add(dev);
      if (error) {
            printk(KERN_ERR "FC Virtual Port device_add failed\n");
            goto delete_vport;
      }
      transport_add_device(dev);
      transport_configure_device(dev);

      error = fci->f->vport_create(vport, ids->disable);
      if (error) {
            printk(KERN_ERR "FC Virtual Port LLDD Create failed\n");
            goto delete_vport_all;
      }

      /*
       * if the parent isn't the physical adapter's Scsi_Host, ensure
       * the Scsi_Host at least contains ia symlink to the vport.
       */
      if (pdev != &shost->shost_gendev) {
            error = sysfs_create_link(&shost->shost_gendev.kobj,
                         &dev->kobj, dev_name(dev));
            if (error)
                  printk(KERN_ERR
                        "%s: Cannot create vport symlinks for "
                        "%s, err=%d\n",
                        __func__, dev_name(dev), error);
      }
      spin_lock_irqsave(shost->host_lock, flags);
      vport->flags &= ~FC_VPORT_CREATING;
      spin_unlock_irqrestore(shost->host_lock, flags);

      dev_printk(KERN_NOTICE, pdev,
                  "%s created via shost%d channel %d\n", dev_name(dev),
                  shost->host_no, channel);

      *ret_vport = vport;

      return 0;

delete_vport_all:
      transport_remove_device(dev);
      device_del(dev);
delete_vport:
      transport_destroy_device(dev);
      spin_lock_irqsave(shost->host_lock, flags);
      list_del(&vport->peers);
      put_device(&shost->shost_gendev);   /* for fc_host->vport list */
      fc_host->npiv_vports_inuse--;
      spin_unlock_irqrestore(shost->host_lock, flags);
      put_device(dev->parent);
      kfree(vport);

      return error;
}

/**
 * fc_vport_create - Admin App or LLDD requests creation of a vport
 * @shost:  scsi host the virtual port is connected to.
 * @channel:      channel on shost port connected to.
 * @ids:    The world wide names, FC4 port roles, etc for
 *              the virtual port.
 *
 * Notes:
 *    This routine assumes no locks are held on entry.
 */
struct fc_vport *
fc_vport_create(struct Scsi_Host *shost, int channel,
      struct fc_vport_identifiers *ids)
{
      int stat;
      struct fc_vport *vport;

      stat = fc_vport_setup(shost, channel, &shost->shost_gendev,
             ids, &vport);
      return stat ? NULL : vport;
}
EXPORT_SYMBOL(fc_vport_create);

/**
 * fc_vport_terminate - Admin App or LLDD requests termination of a vport
 * @vport:  fc_vport to be terminated
 *
 * Calls the LLDD vport_delete() function, then deallocates and removes
 * the vport from the shost and object tree.
 *
 * Notes:
 *    This routine assumes no locks are held on entry.
 */
int
fc_vport_terminate(struct fc_vport *vport)
{
      struct Scsi_Host *shost = vport_to_shost(vport);
      struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
      struct fc_internal *i = to_fc_internal(shost->transportt);
      struct device *dev = &vport->dev;
      unsigned long flags;
      int stat;

      spin_lock_irqsave(shost->host_lock, flags);
      if (vport->flags & FC_VPORT_CREATING) {
            spin_unlock_irqrestore(shost->host_lock, flags);
            return -EBUSY;
      }
      if (vport->flags & (FC_VPORT_DEL)) {
            spin_unlock_irqrestore(shost->host_lock, flags);
            return -EALREADY;
      }
      vport->flags |= FC_VPORT_DELETING;
      spin_unlock_irqrestore(shost->host_lock, flags);

      if (i->f->vport_delete)
            stat = i->f->vport_delete(vport);
      else
            stat = -ENOENT;

      spin_lock_irqsave(shost->host_lock, flags);
      vport->flags &= ~FC_VPORT_DELETING;
      if (!stat) {
            vport->flags |= FC_VPORT_DELETED;
            list_del(&vport->peers);
            fc_host->npiv_vports_inuse--;
            put_device(&shost->shost_gendev);  /* for fc_host->vport list */
      }
      spin_unlock_irqrestore(shost->host_lock, flags);

      if (stat)
            return stat;

      if (dev->parent != &shost->shost_gendev)
            sysfs_remove_link(&shost->shost_gendev.kobj, dev_name(dev));
      transport_remove_device(dev);
      device_del(dev);
      transport_destroy_device(dev);

      /*
       * Removing our self-reference should mean our
       * release function gets called, which will drop the remaining
       * parent reference and free the data structure.
       */
      put_device(dev);              /* for self-reference */

      return 0; /* SUCCESS */
}
EXPORT_SYMBOL(fc_vport_terminate);

/**
 * fc_vport_sched_delete - workq-based delete request for a vport
 * @work:   vport to be deleted.
 */
static void
fc_vport_sched_delete(struct work_struct *work)
{
      struct fc_vport *vport =
            container_of(work, struct fc_vport, vport_delete_work);
      int stat;

      stat = fc_vport_terminate(vport);
      if (stat)
            dev_printk(KERN_ERR, vport->dev.parent,
                  "%s: %s could not be deleted created via "
                  "shost%d channel %d - error %d\n", __func__,
                  dev_name(&vport->dev), vport->shost->host_no,
                  vport->channel, stat);
}


/*
 * BSG support
 */


/**
 * fc_destroy_bsgjob - routine to teardown/delete a fc bsg job
 * @job:    fc_bsg_job that is to be torn down
 */
static void
fc_destroy_bsgjob(struct fc_bsg_job *job)
{
      unsigned long flags;

      spin_lock_irqsave(&job->job_lock, flags);
      if (job->ref_cnt) {
            spin_unlock_irqrestore(&job->job_lock, flags);
            return;
      }
      spin_unlock_irqrestore(&job->job_lock, flags);

      put_device(job->dev);   /* release reference for the request */

      kfree(job->request_payload.sg_list);
      kfree(job->reply_payload.sg_list);
      kfree(job);
}

/**
 * fc_bsg_jobdone - completion routine for bsg requests that the LLD has
 *                  completed
 * @job:    fc_bsg_job that is complete
 */
static void
fc_bsg_jobdone(struct fc_bsg_job *job)
{
      struct request *req = job->req;
      struct request *rsp = req->next_rq;
      int err;

      err = job->req->errors = job->reply->result;

      if (err < 0)
            /* we're only returning the result field in the reply */
            job->req->sense_len = sizeof(uint32_t);
      else
            job->req->sense_len = job->reply_len;

      /* we assume all request payload was transferred, residual == 0 */
      req->resid_len = 0;

      if (rsp) {
            WARN_ON(job->reply->reply_payload_rcv_len > rsp->resid_len);

            /* set reply (bidi) residual */
            rsp->resid_len -= min(job->reply->reply_payload_rcv_len,
                              rsp->resid_len);
      }
      blk_complete_request(req);
}

/**
 * fc_bsg_softirq_done - softirq done routine for destroying the bsg requests
 * @req:        BSG request that holds the job to be destroyed
 */
static void fc_bsg_softirq_done(struct request *rq)
{
      struct fc_bsg_job *job = rq->special;
      unsigned long flags;

      spin_lock_irqsave(&job->job_lock, flags);
      job->state_flags |= FC_RQST_STATE_DONE;
      job->ref_cnt--;
      spin_unlock_irqrestore(&job->job_lock, flags);

      blk_end_request_all(rq, rq->errors);
      fc_destroy_bsgjob(job);
}

/**
 * fc_bsg_job_timeout - handler for when a bsg request timesout
 * @req:    request that timed out
 */
static enum blk_eh_timer_return
fc_bsg_job_timeout(struct request *req)
{
      struct fc_bsg_job *job = (void *) req->special;
      struct Scsi_Host *shost = job->shost;
      struct fc_internal *i = to_fc_internal(shost->transportt);
      unsigned long flags;
      int err = 0, done = 0;

      if (job->rport && job->rport->port_state == FC_PORTSTATE_BLOCKED)
            return BLK_EH_RESET_TIMER;

      spin_lock_irqsave(&job->job_lock, flags);
      if (job->state_flags & FC_RQST_STATE_DONE)
            done = 1;
      else
            job->ref_cnt++;
      spin_unlock_irqrestore(&job->job_lock, flags);

      if (!done && i->f->bsg_timeout) {
            /* call LLDD to abort the i/o as it has timed out */
            err = i->f->bsg_timeout(job);
            if (err)
                  printk(KERN_ERR "ERROR: FC BSG request timeout - LLD "
                        "abort failed with status %d\n", err);
      }

      /* the blk_end_sync_io() doesn't check the error */
      if (done)
            return BLK_EH_NOT_HANDLED;
      else
            return BLK_EH_HANDLED;
}

static int
fc_bsg_map_buffer(struct fc_bsg_buffer *buf, struct request *req)
{
      size_t sz = (sizeof(struct scatterlist) * req->nr_phys_segments);

      BUG_ON(!req->nr_phys_segments);

      buf->sg_list = kzalloc(sz, GFP_KERNEL);
      if (!buf->sg_list)
            return -ENOMEM;
      sg_init_table(buf->sg_list, req->nr_phys_segments);
      buf->sg_cnt = blk_rq_map_sg(req->q, req, buf->sg_list);
      buf->payload_len = blk_rq_bytes(req);
      return 0;
}


/**
 * fc_req_to_bsgjob - Allocate/create the fc_bsg_job structure for the
 *                   bsg request
 * @shost:  SCSI Host corresponding to the bsg object
 * @rport:  (optional) FC Remote Port corresponding to the bsg object
 * @req:    BSG request that needs a job structure
 */
static int
fc_req_to_bsgjob(struct Scsi_Host *shost, struct fc_rport *rport,
      struct request *req)
{
      struct fc_internal *i = to_fc_internal(shost->transportt);
      struct request *rsp = req->next_rq;
      struct fc_bsg_job *job;
      int ret;

      BUG_ON(req->special);

      job = kzalloc(sizeof(struct fc_bsg_job) + i->f->dd_bsg_size,
                  GFP_KERNEL);
      if (!job)
            return -ENOMEM;

      /*
       * Note: this is a bit silly.
       * The request gets formatted as a SGIO v4 ioctl request, which
       * then gets reformatted as a blk request, which then gets
       * reformatted as a fc bsg request. And on completion, we have
       * to wrap return results such that SGIO v4 thinks it was a scsi
       * status.  I hope this was all worth it.
       */

      req->special = job;
      job->shost = shost;
      job->rport = rport;
      job->req = req;
      if (i->f->dd_bsg_size)
            job->dd_data = (void *)&job[1];
      spin_lock_init(&job->job_lock);
      job->request = (struct fc_bsg_request *)req->cmd;
      job->request_len = req->cmd_len;
      job->reply = req->sense;
      job->reply_len = SCSI_SENSE_BUFFERSIZE;   /* Size of sense buffer
                                     * allocated */
      if (req->bio) {
            ret = fc_bsg_map_buffer(&job->request_payload, req);
            if (ret)
                  goto failjob_rls_job;
      }
      if (rsp && rsp->bio) {
            ret = fc_bsg_map_buffer(&job->reply_payload, rsp);
            if (ret)
                  goto failjob_rls_rqst_payload;
      }
      job->job_done = fc_bsg_jobdone;
      if (rport)
            job->dev = &rport->dev;
      else
            job->dev = &shost->shost_gendev;
      get_device(job->dev);         /* take a reference for the request */

      job->ref_cnt = 1;

      return 0;


failjob_rls_rqst_payload:
      kfree(job->request_payload.sg_list);
failjob_rls_job:
      kfree(job);
      return -ENOMEM;
}


enum fc_dispatch_result {
      FC_DISPATCH_BREAK,      /* on return, q is locked, break from q loop */
      FC_DISPATCH_LOCKED,     /* on return, q is locked, continue on */
      FC_DISPATCH_UNLOCKED,   /* on return, q is unlocked, continue on */
};


/**
 * fc_bsg_host_dispatch - process fc host bsg requests and dispatch to LLDD
 * @shost:  scsi host rport attached to
 * @job:    bsg job to be processed
 */
static enum fc_dispatch_result
fc_bsg_host_dispatch(struct request_queue *q, struct Scsi_Host *shost,
                   struct fc_bsg_job *job)
{
      struct fc_internal *i = to_fc_internal(shost->transportt);
      int cmdlen = sizeof(uint32_t);      /* start with length of msgcode */
      int ret;

      /* Validate the host command */
      switch (job->request->msgcode) {
      case FC_BSG_HST_ADD_RPORT:
            cmdlen += sizeof(struct fc_bsg_host_add_rport);
            break;

      case FC_BSG_HST_DEL_RPORT:
            cmdlen += sizeof(struct fc_bsg_host_del_rport);
            break;

      case FC_BSG_HST_ELS_NOLOGIN:
            cmdlen += sizeof(struct fc_bsg_host_els);
            /* there better be a xmt and rcv payloads */
            if ((!job->request_payload.payload_len) ||
                (!job->reply_payload.payload_len)) {
                  ret = -EINVAL;
                  goto fail_host_msg;
            }
            break;

      case FC_BSG_HST_CT:
            cmdlen += sizeof(struct fc_bsg_host_ct);
            /* there better be xmt and rcv payloads */
            if ((!job->request_payload.payload_len) ||
                (!job->reply_payload.payload_len)) {
                  ret = -EINVAL;
                  goto fail_host_msg;
            }
            break;

      case FC_BSG_HST_VENDOR:
            cmdlen += sizeof(struct fc_bsg_host_vendor);
            if ((shost->hostt->vendor_id == 0L) ||
                (job->request->rqst_data.h_vendor.vendor_id !=
                  shost->hostt->vendor_id)) {
                  ret = -ESRCH;
                  goto fail_host_msg;
            }
            break;

      default:
            ret = -EBADR;
            goto fail_host_msg;
      }

      /* check if we really have all the request data needed */
      if (job->request_len < cmdlen) {
            ret = -ENOMSG;
            goto fail_host_msg;
      }

      ret = i->f->bsg_request(job);
      if (!ret)
            return FC_DISPATCH_UNLOCKED;

fail_host_msg:
      /* return the errno failure code as the only status */
      BUG_ON(job->reply_len < sizeof(uint32_t));
      job->reply->result = ret;
      job->reply_len = sizeof(uint32_t);
      fc_bsg_jobdone(job);
      return FC_DISPATCH_UNLOCKED;
}


/*
 * fc_bsg_goose_queue - restart rport queue in case it was stopped
 * @rport:  rport to be restarted
 */
static void
fc_bsg_goose_queue(struct fc_rport *rport)
{
      int flagset;
      unsigned long flags;

      if (!rport->rqst_q)
            return;

      get_device(&rport->dev);

      spin_lock_irqsave(rport->rqst_q->queue_lock, flags);
      flagset = test_bit(QUEUE_FLAG_REENTER, &rport->rqst_q->queue_flags) &&
              !test_bit(QUEUE_FLAG_REENTER, &rport->rqst_q->queue_flags);
      if (flagset)
            queue_flag_set(QUEUE_FLAG_REENTER, rport->rqst_q);
      __blk_run_queue(rport->rqst_q);
      if (flagset)
            queue_flag_clear(QUEUE_FLAG_REENTER, rport->rqst_q);
      spin_unlock_irqrestore(rport->rqst_q->queue_lock, flags);

      put_device(&rport->dev);
}


/**
 * fc_bsg_rport_dispatch - process rport bsg requests and dispatch to LLDD
 * @shost:  scsi host rport attached to
 * @rport:  rport request destined to
 * @job:    bsg job to be processed
 */
static enum fc_dispatch_result
fc_bsg_rport_dispatch(struct request_queue *q, struct Scsi_Host *shost,
                   struct fc_rport *rport, struct fc_bsg_job *job)
{
      struct fc_internal *i = to_fc_internal(shost->transportt);
      int cmdlen = sizeof(uint32_t);      /* start with length of msgcode */
      int ret;

      /* Validate the rport command */
      switch (job->request->msgcode) {
      case FC_BSG_RPT_ELS:
            cmdlen += sizeof(struct fc_bsg_rport_els);
            goto check_bidi;

      case FC_BSG_RPT_CT:
            cmdlen += sizeof(struct fc_bsg_rport_ct);
check_bidi:
            /* there better be xmt and rcv payloads */
            if ((!job->request_payload.payload_len) ||
                (!job->reply_payload.payload_len)) {
                  ret = -EINVAL;
                  goto fail_rport_msg;
            }
            break;
      default:
            ret = -EBADR;
            goto fail_rport_msg;
      }

      /* check if we really have all the request data needed */
      if (job->request_len < cmdlen) {
            ret = -ENOMSG;
            goto fail_rport_msg;
      }

      ret = i->f->bsg_request(job);
      if (!ret)
            return FC_DISPATCH_UNLOCKED;

fail_rport_msg:
      /* return the errno failure code as the only status */
      BUG_ON(job->reply_len < sizeof(uint32_t));
      job->reply->result = ret;
      job->reply_len = sizeof(uint32_t);
      fc_bsg_jobdone(job);
      return FC_DISPATCH_UNLOCKED;
}


/**
 * fc_bsg_request_handler - generic handler for bsg requests
 * @q:            request queue to manage
 * @shost:  Scsi_Host related to the bsg object
 * @rport:  FC remote port related to the bsg object (optional)
 * @dev:    device structure for bsg object
 */
static void
fc_bsg_request_handler(struct request_queue *q, struct Scsi_Host *shost,
                   struct fc_rport *rport, struct device *dev)
{
      struct request *req;
      struct fc_bsg_job *job;
      enum fc_dispatch_result ret;

      if (!get_device(dev))
            return;

      while (!blk_queue_plugged(q)) {
            if (rport && (rport->port_state == FC_PORTSTATE_BLOCKED))
                        break;

            req = blk_fetch_request(q);
            if (!req)
                  break;

            if (rport && (rport->port_state != FC_PORTSTATE_ONLINE)) {
                  req->errors = -ENXIO;
                  spin_unlock_irq(q->queue_lock);
                  blk_end_request(req, -ENXIO, blk_rq_bytes(req));
                  spin_lock_irq(q->queue_lock);
                  continue;
            }

            spin_unlock_irq(q->queue_lock);

            ret = fc_req_to_bsgjob(shost, rport, req);
            if (ret) {
                  req->errors = ret;
                  blk_end_request(req, ret, blk_rq_bytes(req));
                  spin_lock_irq(q->queue_lock);
                  continue;
            }

            job = req->special;

            /* check if we have the msgcode value at least */
            if (job->request_len < sizeof(uint32_t)) {
                  BUG_ON(job->reply_len < sizeof(uint32_t));
                  job->reply->result = -ENOMSG;
                  job->reply_len = sizeof(uint32_t);
                  fc_bsg_jobdone(job);
                  spin_lock_irq(q->queue_lock);
                  continue;
            }

            /* the dispatch routines will unlock the queue_lock */
            if (rport)
                  ret = fc_bsg_rport_dispatch(q, shost, rport, job);
            else
                  ret = fc_bsg_host_dispatch(q, shost, job);

            /* did dispatcher hit state that can't process any more */
            if (ret == FC_DISPATCH_BREAK)
                  break;

            /* did dispatcher had released the lock */
            if (ret == FC_DISPATCH_UNLOCKED)
                  spin_lock_irq(q->queue_lock);
      }

      spin_unlock_irq(q->queue_lock);
      put_device(dev);
      spin_lock_irq(q->queue_lock);
}


/**
 * fc_bsg_host_handler - handler for bsg requests for a fc host
 * @q:            fc host request queue
 */
static void
fc_bsg_host_handler(struct request_queue *q)
{
      struct Scsi_Host *shost = q->queuedata;

      fc_bsg_request_handler(q, shost, NULL, &shost->shost_gendev);
}


/**
 * fc_bsg_rport_handler - handler for bsg requests for a fc rport
 * @q:            rport request queue
 */
static void
fc_bsg_rport_handler(struct request_queue *q)
{
      struct fc_rport *rport = q->queuedata;
      struct Scsi_Host *shost = rport_to_shost(rport);

      fc_bsg_request_handler(q, shost, rport, &rport->dev);
}


/**
 * fc_bsg_hostadd - Create and add the bsg hooks so we can receive requests
 * @shost:  shost for fc_host
 * @fc_host:      fc_host adding the structures to
 */
static int
fc_bsg_hostadd(struct Scsi_Host *shost, struct fc_host_attrs *fc_host)
{
      struct device *dev = &shost->shost_gendev;
      struct fc_internal *i = to_fc_internal(shost->transportt);
      struct request_queue *q;
      int err;
      char bsg_name[20];

      fc_host->rqst_q = NULL;

      if (!i->f->bsg_request)
            return -ENOTSUPP;

      snprintf(bsg_name, sizeof(bsg_name),
             "fc_host%d", shost->host_no);

      q = __scsi_alloc_queue(shost, fc_bsg_host_handler);
      if (!q) {
            printk(KERN_ERR "fc_host%d: bsg interface failed to "
                        "initialize - no request queue\n",
                         shost->host_no);
            return -ENOMEM;
      }

      q->queuedata = shost;
      queue_flag_set_unlocked(QUEUE_FLAG_BIDI, q);
      blk_queue_softirq_done(q, fc_bsg_softirq_done);
      blk_queue_rq_timed_out(q, fc_bsg_job_timeout);
      blk_queue_rq_timeout(q, FC_DEFAULT_BSG_TIMEOUT);

      err = bsg_register_queue(q, dev, bsg_name, NULL);
      if (err) {
            printk(KERN_ERR "fc_host%d: bsg interface failed to "
                        "initialize - register queue\n",
                        shost->host_no);
            blk_cleanup_queue(q);
            return err;
      }

      fc_host->rqst_q = q;
      return 0;
}


/**
 * fc_bsg_rportadd - Create and add the bsg hooks so we can receive requests
 * @shost:  shost that rport is attached to
 * @rport:  rport that the bsg hooks are being attached to
 */
static int
fc_bsg_rportadd(struct Scsi_Host *shost, struct fc_rport *rport)
{
      struct device *dev = &rport->dev;
      struct fc_internal *i = to_fc_internal(shost->transportt);
      struct request_queue *q;
      int err;

      rport->rqst_q = NULL;

      if (!i->f->bsg_request)
            return -ENOTSUPP;

      q = __scsi_alloc_queue(shost, fc_bsg_rport_handler);
      if (!q) {
            printk(KERN_ERR "%s: bsg interface failed to "
                        "initialize - no request queue\n",
                         dev->kobj.name);
            return -ENOMEM;
      }

      q->queuedata = rport;
      queue_flag_set_unlocked(QUEUE_FLAG_BIDI, q);
      blk_queue_softirq_done(q, fc_bsg_softirq_done);
      blk_queue_rq_timed_out(q, fc_bsg_job_timeout);
      blk_queue_rq_timeout(q, BLK_DEFAULT_SG_TIMEOUT);

      err = bsg_register_queue(q, dev, NULL, NULL);
      if (err) {
            printk(KERN_ERR "%s: bsg interface failed to "
                        "initialize - register queue\n",
                         dev->kobj.name);
            blk_cleanup_queue(q);
            return err;
      }

      rport->rqst_q = q;
      return 0;
}


/**
 * fc_bsg_remove - Deletes the bsg hooks on fchosts/rports
 * @q:      the request_queue that is to be torn down.
 */
static void
fc_bsg_remove(struct request_queue *q)
{
      if (q) {
            bsg_unregister_queue(q);
            blk_cleanup_queue(q);
      }
}


/* Original Author:  Martin Hicks */
MODULE_AUTHOR("James Smart");
MODULE_DESCRIPTION("FC Transport Attributes");
MODULE_LICENSE("GPL");

module_init(fc_transport_init);
module_exit(fc_transport_exit);

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