/*

   *  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_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);
  
  /*

   * 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, "
  ");			\
  	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, "
  ");
  	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;
  	}

  	return 0;
  }
  
  static DECLARE_TRANSPORT_CLASS(fc_host_class,
  			       "fc_host",
  			       fc_host_setup,
  			       NULL,
  			       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
  ",

  		__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
  ",

  		__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 != '
  '))					\
  		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
  ", 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
  ", 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
  ");
  	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
  ", 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 != '
  ')) ||
  	    (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
  ", 20, unsigned long long);
  fc_private_rport_rd_attr_cast(port_name, "0x%llx
  ", 20, unsigned long long);
  fc_private_rport_rd_attr(port_id, "0x%06x
  ", 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
  ");
  		case FC_FABCTLR_PORTID:
  			return snprintf(buf, 30, "Fabric Controller
  ");
  		case FC_DIRSRVR_PORTID:
  			return snprintf(buf, 30, "Directory Server
  ");
  		case FC_TIMESRVR_PORTID:
  			return snprintf(buf, 30, "Time Server
  ");
  		case FC_MGMTSRVR_PORTID:
  			return snprintf(buf, 30, "Management Server
  ");
  		default:
  			return snprintf(buf, 30, "Unknown Fabric Entity
  ");
  		}
  	} else {

  		if (rport->roles == FC_PORT_ROLE_UNKNOWN)

  			return snprintf(buf, 20, "unknown
  ");

  		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
  ", 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
  ");
  	return snprintf(buf, 20, "%d
  ", 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 != '
  ')) ||
  		    (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
  ", 20, unsigned long long);
  fc_starget_rd_attr_cast(port_name, "0x%llx
  ", 20, unsigned long long);
  fc_starget_rd_attr(port_id, "0x%06x
  ", 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 != '
  '))					\
  		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] == '
  ')						\
  		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 != '
  '))					\
  		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
  ", 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
  ", 20, unsigned long long);
  fc_private_vport_rd_attr_cast(port_name, "0x%llx
  ", 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
  ");
  	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
  ",
  		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 != '
  '))					\
  		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] == '
  ')						\
  		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
  ", 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
  ");
  
  	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
  ");
  
  	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
  ", 20, unsigned long long);
  fc_private_host_rd_attr_cast(port_name, "0x%llx
  ", 20, unsigned long long);

  fc_private_host_rd_attr_cast(permanent_port_name, "0x%llx
  ", 20,
  			     unsigned long long);

  fc_private_host_rd_attr(maxframe_size, "%u bytes
  ", 20);

  fc_private_host_rd_attr(max_npiv_vports, "%u
  ", 20);

  fc_private_host_rd_attr(serial_number, "%s
  ", (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
  ");
  
  	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
  ", 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
  ", 20, unsigned long long);

  fc_host_rd_attr(symbolic_name, "%s
  ", FC_SYMBOLIC_NAME_SIZE + 1);

  fc_private_host_show_function(system_hostname, "%s
  ",
  		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
  ", 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
  ", 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
  ",
  			      (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] == '
  ')
  		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] == '
  ')
  		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.
  ", 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.
  ", 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.
  ", 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.
  ", 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);

  	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
  ", __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
  ");
  		goto delete_rport;
  	}
  	transport_add_device(dev);
  	transport_configure_device(dev);

  	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);

  				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);