scsi_transport_fc.c 96.3 KB
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/* 
 *  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
 *
 *  ========
 *
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 *  Copyright (C) 2004-2007   James Smart, Emulex Corporation
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 *    Rewrite for host, target, device, and remote port attributes,
 *    statistics, and service functions...
 *
 */
#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>
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#include <scsi/scsi_cmnd.h>
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#include <linux/netlink.h>
#include <net/netlink.h>
#include <scsi/scsi_netlink_fc.h>
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#include "scsi_priv.h"

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static int fc_queue_work(struct Scsi_Host *, struct work_struct *);

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/*
 * This is a temporary carrier for creating a vport. It will eventually
 * be replaced  by a real message definition for sgio or netlink.
 *
 * fc_vport_identifiers: This set of data contains all elements
 * to uniquely identify and instantiate a FC virtual port.
 *
 * Notes:
 *   symbolic_name: The driver is to append the symbolic_name string data
 *      to the symbolic_node_name data that it generates by default.
 *      the resulting combination should then be registered with the switch.
 *      It is expected that things like Xen may stuff a VM title into
 *      this field.
 */
struct fc_vport_identifiers {
	u64 node_name;
	u64 port_name;
	u32 roles;
	bool disable;
	enum fc_port_type vport_type;	/* only FC_PORTTYPE_NPIV allowed */
	char symbolic_name[FC_VPORT_SYMBOLIC_NAMELEN];
};

static int fc_vport_create(struct Scsi_Host *shost, int channel,
	struct device *pdev, struct fc_vport_identifiers  *ids,
	struct fc_vport **vport);

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/*
 * Redefine so that we can have same named attributes in the
 * sdev/starget/host objects.
 */
#define FC_CLASS_DEVICE_ATTR(_prefix,_name,_mode,_show,_store)		\
struct class_device_attribute class_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;						\
									\
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	for (i = 0; i < ARRAY_SIZE(table); i++) {			\
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		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;								\
									\
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	for (i = 0; i < ARRAY_SIZE(table); i++) {			\
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		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" },
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	{ FC_PORTTYPE_NPIV,		"NPIV VPORT" },
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};
fc_enum_name_search(port_type, fc_port_type, fc_port_type_names)
#define FC_PORTTYPE_MAX_NAMELEN		50

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

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/* 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


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/* 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" },
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	{ FC_PORTSTATE_DELETED,		"Deleted" },
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};
fc_enum_name_search(port_state, fc_port_state, fc_port_state_names)
#define FC_PORTSTATE_MAX_NAMELEN	20


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/* 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


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/* Convert fc_tgtid_binding_type values to ascii string name */
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static const struct {
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	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;							\
								\
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	for (i = 0; i < ARRAY_SIZE(table); i++) {		\
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		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 */
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static const struct {
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	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 */
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static const struct {
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	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" },
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	{ FC_PORTSPEED_8GBIT,		"8 Gbit" },
	{ FC_PORTSPEED_16GBIT,		"16 Gbit" },
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	{ 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;
}


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/* Convert FC_PORT_ROLE bit values to ascii string name */
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static const struct {
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	u32 			value;
	char			*name;
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} 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" },
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};
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fc_bitfield_name_search(port_roles, fc_port_role_names)
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/*
 * 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


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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);
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/*
 * Attribute counts pre object type...
 * Increase these values if you add attributes
 */
#define FC_STARGET_NUM_ATTRS 	3
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#define FC_RPORT_NUM_ATTRS	10
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#define FC_VPORT_NUM_ATTRS	9
#define FC_HOST_NUM_ATTRS	21
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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 class_device_attribute private_starget_attrs[
							FC_STARGET_NUM_ATTRS];
	struct class_device_attribute *starget_attrs[FC_STARGET_NUM_ATTRS + 1];

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

	struct transport_container rport_attr_cont;
	struct class_device_attribute private_rport_attrs[FC_RPORT_NUM_ATTRS];
	struct class_device_attribute *rport_attrs[FC_RPORT_NUM_ATTRS + 1];
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	struct transport_container vport_attr_cont;
	struct class_device_attribute private_vport_attrs[FC_VPORT_NUM_ATTRS];
	struct class_device_attribute *vport_attrs[FC_VPORT_NUM_ATTRS + 1];
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};

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

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static int fc_target_setup(struct transport_container *tc, struct device *dev,
			   struct class_device *cdev)
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{
	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);

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static int fc_host_setup(struct transport_container *tc, struct device *dev,
			 struct class_device *cdev)
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{
	struct Scsi_Host *shost = dev_to_shost(dev);
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	struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
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	/* 
	 * 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.
	 */
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	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;
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	fc_host->max_npiv_vports = 0;
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	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;
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	memset(fc_host->symbolic_name, 0, sizeof(fc_host->symbolic_name));
	memset(fc_host->system_hostname, 0, sizeof(fc_host->system_hostname));
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	fc_host->tgtid_bind_type = FC_TGTID_BIND_BY_WWPN;

	INIT_LIST_HEAD(&fc_host->rports);
	INIT_LIST_HEAD(&fc_host->rport_bindings);
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	INIT_LIST_HEAD(&fc_host->vports);
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	fc_host->next_rport_number = 0;
	fc_host->next_target_id = 0;
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	fc_host->next_vport_number = 0;
	fc_host->npiv_vports_inuse = 0;
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	snprintf(fc_host->work_q_name, KOBJ_NAME_LEN, "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, KOBJ_NAME_LEN, "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;
	}

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	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);

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/*
 * 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);

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/*
 * 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.
 */
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static unsigned int fc_dev_loss_tmo = 60;		/* seconds */
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module_param_named(dev_loss_tmo, fc_dev_loss_tmo, int, 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.");

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/**
 * Netlink Infrastructure
 **/

static atomic_t fc_event_seq;

/**
 * fc_get_event_number - Obtain the next sequential FC event number
 *
 * Notes:
 *   We could have inline'd 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;

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	err = nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
			      GFP_KERNEL);
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	if (err && (err != -ESRCH))	/* filter no recipient errors */
		/* nlmsg_multicast already kfree_skb'd */
		goto send_fail;

	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",
		__FUNCTION__, 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
 *                             a 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
 *
 * Notes:
 *	This routine assumes no locks are held on entry.
 **/
void
fc_host_post_vendor_event(struct Scsi_Host *shost, u32 event_number,
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		u32 data_len, char * data_buf, u64 vendor_id)
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{
	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);

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	err = nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
			      GFP_KERNEL);
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	if (err && (err != -ESRCH))	/* filter no recipient errors */
		/* nlmsg_multicast already kfree_skb'd */
		goto send_vendor_fail;

	return;

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


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static __init int fc_transport_init(void)
{
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	int error;

	atomic_set(&fc_event_seq, 0);

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

/*
 * FC Remote Port Attribute Management
 */

#define fc_rport_show_function(field, format_string, sz, cast)		\
static ssize_t								\
show_fc_rport_##field (struct class_device *cdev, char *buf)		\
{									\
	struct fc_rport *rport = transport_class_to_rport(cdev);	\
	struct Scsi_Host *shost = rport_to_shost(rport);		\
	struct fc_internal *i = to_fc_internal(shost->transportt);	\
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	if ((i->f->get_rport_##field) &&				\
	    !((rport->port_state == FC_PORTSTATE_BLOCKED) ||		\
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	      (rport->port_state == FC_PORTSTATE_DELETED) ||		\
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	      (rport->port_state == FC_PORTSTATE_NOTPRESENT)))		\
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		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 class_device *cdev, const char *buf,	\
			   size_t count)				\
{									\
	int val;							\
	struct fc_rport *rport = transport_class_to_rport(cdev);	\
	struct Scsi_Host *shost = rport_to_shost(rport);		\
	struct fc_internal *i = to_fc_internal(shost->transportt);	\
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	char *cp;							\
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	if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||		\
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	    (rport->port_state == FC_PORTSTATE_DELETED) ||		\
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	    (rport->port_state == FC_PORTSTATE_NOTPRESENT))		\
		return -EBUSY;						\
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	val = simple_strtoul(buf, &cp, 0);				\
	if (*cp && (*cp != '\n'))					\
		return -EINVAL;						\
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	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_CLASS_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_CLASS_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_CLASS_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 class_device *cdev, char *buf)		\
{									\
	struct fc_rport *rport = transport_class_to_rport(cdev);	\
	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_CLASS_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_CLASS_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 class_device *cdev, char *buf)		\
{									\
	struct fc_rport *rport = transport_class_to_rport(cdev);	\
	const char *name;						\
	name = get_fc_##title##_name(rport->title);			\
	if (!name)							\
		return -EINVAL;						\
	return snprintf(buf, maxlen, "%s\n", name);			\
}									\
static FC_CLASS_DEVICE_ATTR(rport, title, S_IRUGO,			\
			show_fc_rport_##title, NULL)


#define SETUP_RPORT_ATTRIBUTE_RD(field)					\
	i->private_rport_attrs[count] = class_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] = class_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] = class_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++

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

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/* 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 class_device *cdev, char *buf)
{
	struct fc_rport *rport = transport_class_to_rport(cdev);
	if (rport->supported_classes == FC_COS_UNSPECIFIED)
		return snprintf(buf, 20, "unspecified\n");
	return get_fc_cos_names(rport->supported_classes, buf);
}
static FC_CLASS_DEVICE_ATTR(rport, supported_classes, S_IRUGO,
		show_fc_rport_supported_classes, NULL);

/* Dynamic Remote Port Attributes */

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

	/* 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 {
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		if (rport->roles == FC_PORT_ROLE_UNKNOWN)
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			return snprintf(buf, 20, "unknown\n");
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		return get_fc_port_roles_names(rport->roles, buf);
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	}
}
static FC_CLASS_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);

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/*
 * fast_io_fail_tmo attribute
 */
static ssize_t
show_fc_rport_fast_io_fail_tmo (struct class_device *cdev, char *buf)
{
	struct fc_rport *rport = transport_class_to_rport(cdev);

	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 class_device *cdev, const char *buf,
			   size_t count)
{
	int val;
	char *cp;
	struct fc_rport *rport = transport_class_to_rport(cdev);

	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_CLASS_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);
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/*
 * FC SCSI Target Attribute Management
 */

/*
 * Note: in the target show function we recognize when the remote
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 *  port is in the heirarchy and do not allow the driver to get
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 *  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 class_device *cdev, char *buf)		\
{									\
	struct scsi_target *starget = transport_class_to_starget(cdev);	\
	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_CLASS_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_CLASS_DEVICE_ATTR(starget, field, S_IRUGO,			\
			  show_fc_starget_##field, NULL)

#define SETUP_STARGET_ATTRIBUTE_RD(field)				\
	i->private_starget_attrs[count] = class_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] = class_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);


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/*
 * FC Virtual Port Attribute Management
 */

#define fc_vport_show_function(field, format_string, sz, cast)		\
static ssize_t								\
show_fc_vport_##field (struct class_device *cdev, char *buf)		\
{									\
	struct fc_vport *vport = transport_class_to_vport(cdev);	\
	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 class_device *cdev, const char *buf,	\
			   size_t count)				\
{									\
	int val;							\
	struct fc_vport *vport = transport_class_to_vport(cdev);	\
	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 class_device *cdev, const char *buf,	\
			   size_t count)				\
{									\
	struct fc_vport *vport = transport_class_to_vport(cdev);	\
	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_CLASS_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_CLASS_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_CLASS_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 class_device *cdev, char *buf)		\
{									\
	struct fc_vport *vport = transport_class_to_vport(cdev);	\
	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 class_device *cdev, const char *buf,	\
			   size_t count)				\
{									\
	u32 val;							\
	struct fc_vport *vport = transport_class_to_vport(cdev);	\
	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_CLASS_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_CLASS_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_CLASS_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 class_device *cdev, char *buf)		\
{									\
	struct fc_vport *vport = transport_class_to_vport(cdev);	\
	const char *name;						\
	name = get_fc_##title##_name(vport->title);			\
	if (!name)							\
		return -EINVAL;						\
	return snprintf(buf, maxlen, "%s\n", name);			\
}									\
static FC_CLASS_DEVICE_ATTR(vport, title, S_IRUGO,			\
			show_fc_vport_##title, NULL)


#define SETUP_VPORT_ATTRIBUTE_RD(field)					\
	i->private_vport_attrs[count] = class_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] = class_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] = class_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] = class_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] = class_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 class_device *cdev, char *buf)
{
	struct fc_vport *vport = transport_class_to_vport(cdev);

	if (vport->roles == FC_PORT_ROLE_UNKNOWN)
		return snprintf(buf, 20, "unknown\n");
	return get_fc_port_roles_names(vport->roles, buf);
}
static FC_CLASS_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_CLASS_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 class_device *cdev, const char *buf,
			   size_t count)
{
	struct fc_vport *vport = transport_class_to_vport(cdev);
	int stat;

	stat = fc_vport_terminate(vport);
	if (stat)
		return stat;

	return count;
}
static FC_CLASS_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 class_device *cdev, const char *buf,
			   size_t count)
{
	struct fc_vport *vport = transport_class_to_vport(cdev);
	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_CLASS_DEVICE_ATTR(vport, vport_disable, S_IWUSR,
			NULL, store_fc_vport_disable);


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/*
 * Host Attribute Management
 */

#define fc_host_show_function(field, format_string, sz, cast)		\
static ssize_t								\
show_fc_host_##field (struct class_device *cdev, char *buf)		\
{									\
	struct Scsi_Host *shost = transport_class_to_shost(cdev);	\
	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 class_device *cdev, const char *buf,	\
			   size_t count)				\
{									\
	int val;							\
	struct Scsi_Host *shost = transport_class_to_shost(cdev);	\
	struct fc_internal *i = to_fc_internal(shost->transportt);	\
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	char *cp;							\
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									\
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	val = simple_strtoul(buf, &cp, 0);				\
	if (*cp && (*cp != '\n'))					\
		return -EINVAL;						\
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	i->f->set_host_##field(shost, val);				\
	return count;							\
}

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#define fc_host_store_str_function(field, slen)				\
static ssize_t								\
store_fc_host_##field(struct class_device *cdev, const char *buf,	\
			   size_t count)				\
{									\
	struct Scsi_Host *shost = transport_class_to_shost(cdev);	\
	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;							\
}

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#define fc_host_rd_attr(field, format_string, sz)			\
	fc_host_show_function(field, format_string, sz, )		\
static FC_CLASS_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_CLASS_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_CLASS_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 class_device *cdev, char *buf)		\
{									\
	struct Scsi_Host *shost = transport_class_to_shost(cdev);	\
	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_CLASS_DEVICE_ATTR(host, title, S_IRUGO, show_fc_host_##title, NULL)

#define SETUP_HOST_ATTRIBUTE_RD(field)					\
	i->private_host_attrs[count] = class_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++

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#define SETUP_HOST_ATTRIBUTE_RD_NS(field)				\
	i->private_host_attrs[count] = class_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++

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#define SETUP_HOST_ATTRIBUTE_RW(field)					\
	i->private_host_attrs[count] = class_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 class_device *cdev, char *buf)		\
{									\
	struct Scsi_Host *shost = transport_class_to_shost(cdev);	\
	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_CLASS_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_CLASS_DEVICE_ATTR(host, field, S_IRUGO,			\
			  show_fc_host_##field, NULL)

#define SETUP_PRIVATE_HOST_ATTRIBUTE_RD(field)			\
	i->private_host_attrs[count] = class_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)			\
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{									\
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	i->private_host_attrs[count] = class_device_attr_host_##field;	\
	i->host_attrs[count] = &i->private_host_attrs[count];		\
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	count++;							\
}
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/* Fixed Host Attributes */

static ssize_t
show_fc_host_supported_classes (struct class_device *cdev, char *buf)
{
	struct Scsi_Host *shost = transport_class_to_shost(cdev);

	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_CLASS_DEVICE_ATTR(host, supported_classes, S_IRUGO,
		show_fc_host_supported_classes, NULL);

static ssize_t
show_fc_host_supported_fc4s (struct class_device *cdev, char *buf)
{
	struct Scsi_Host *shost = transport_class_to_shost(cdev);
	return (ssize_t)show_fc_fc4s(buf, fc_host_supported_fc4s(shost));
}
static FC_CLASS_DEVICE_ATTR(host, supported_fc4s, S_IRUGO,
		show_fc_host_supported_fc4s, NULL);

static ssize_t
show_fc_host_supported_speeds (struct class_device *cdev, char *buf)
{
	struct Scsi_Host *shost = transport_class_to_shost(cdev);

	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_CLASS_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);
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fc_private_host_rd_attr_cast(permanent_port_name, "0x%llx\n", 20,
			     unsigned long long);
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fc_private_host_rd_attr(maxframe_size, "%u bytes\n", 20);
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fc_private_host_rd_attr(max_npiv_vports, "%u\n", 20);
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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 class_device *cdev, char *buf)
{
	struct Scsi_Host *shost = transport_class_to_shost(cdev);
	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_CLASS_DEVICE_ATTR(host, active_fc4s, S_IRUGO,
		show_fc_host_active_fc4s, NULL);

static ssize_t
show_fc_host_speed (struct class_device *cdev, char *buf)
{
	struct Scsi_Host *shost = transport_class_to_shost(cdev);
	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_CLASS_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);
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fc_host_rd_attr(symbolic_name, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
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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_CLASS_DEVICE_ATTR(host, system_hostname, S_IRUGO | S_IWUSR,
		show_fc_host_system_hostname, store_fc_host_system_hostname);

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/* Private Host Attributes */

static ssize_t
show_fc_private_host_tgtid_bind_type(struct class_device *cdev, char *buf)
{
	struct Scsi_Host *shost = transport_class_to_shost(cdev);
	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);
}

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

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static ssize_t
store_fc_private_host_tgtid_bind_type(struct class_device *cdev,
	const char *buf, size_t count)
{
	struct Scsi_Host *shost = transport_class_to_shost(cdev);
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	struct fc_rport *rport;
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 	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);
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		while (!list_empty(&fc_host_rport_bindings(shost))) {
			get_list_head_entry(rport,
				&fc_host_rport_bindings(shost), peers);
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			list_del(&rport->peers);
			rport->port_state = FC_PORTSTATE_DELETED;
			fc_queue_work(shost, &rport->rport_delete_work);
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		}
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		spin_unlock_irqrestore(shost->host_lock, flags);
	}

	fc_host_tgtid_bind_type(shost) = val;
	return count;
}

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

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static ssize_t
store_fc_private_host_issue_lip(struct class_device *cdev,
	const char *buf, size_t count)
{
	struct Scsi_Host *shost = transport_class_to_shost(cdev);
	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_CLASS_DEVICE_ATTR(host, issue_lip, S_IWUSR, NULL,
			store_fc_private_host_issue_lip);

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


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/*
 * Host Statistics Management
 */

/* Show a given an attribute in the statistics group */
static ssize_t
fc_stat_show(const struct class_device *cdev, char *buf, unsigned long offset)
{
	struct Scsi_Host *shost = transport_class_to_shost(cdev);
	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 class_device *cd, char *buf) 	\
{									\
	return fc_stat_show(cd, buf, 					\
			    offsetof(struct fc_host_statistics, name));	\
}									\
static FC_CLASS_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 class_device *cdev, const char *buf,
			   size_t count)
{
	struct Scsi_Host *shost = transport_class_to_shost(cdev);
	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_CLASS_DEVICE_ATTR(host, reset_statistics, S_IWUSR, NULL,
				fc_reset_statistics);

static struct attribute *fc_statistics_attrs[] = {
	&class_device_attr_host_seconds_since_last_reset.attr,
	&class_device_attr_host_tx_frames.attr,
	&class_device_attr_host_tx_words.attr,
	&class_device_attr_host_rx_frames.attr,
	&class_device_attr_host_rx_words.attr,
	&class_device_attr_host_lip_count.attr,
	&class_device_attr_host_nos_count.attr,
	&class_device_attr_host_error_frames.attr,
	&class_device_attr_host_dumped_frames.attr,
	&class_device_attr_host_link_failure_count.attr,
	&class_device_attr_host_loss_of_sync_count.attr,
	&class_device_attr_host_loss_of_signal_count.attr,
	&class_device_attr_host_prim_seq_protocol_err_count.attr,
	&class_device_attr_host_invalid_tx_word_count.attr,
	&class_device_attr_host_invalid_crc_count.attr,
	&class_device_attr_host_fcp_input_requests.attr,
	&class_device_attr_host_fcp_output_requests.attr,
	&class_device_attr_host_fcp_control_requests.attr,
	&class_device_attr_host_fcp_input_megabytes.attr,
	&class_device_attr_host_fcp_output_megabytes.attr,
	&class_device_attr_host_reset_statistics.attr,
	NULL
};

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

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/* 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 class_device *cdev, const char *buf,
			   size_t count)
{
	struct Scsi_Host *shost = transport_class_to_shost(cdev);
	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_create(shost, 0, &shost->shost_gendev, &vid, &vport);
	return stat ? stat : count;
}
static FC_CLASS_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 class_device *cdev, const char *buf,
			   size_t count)
{
	struct Scsi_Host *shost = transport_class_to_shost(cdev);
	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_CLASS_DEVICE_ATTR(host, vport_delete, S_IWUSR, NULL,
			store_fc_host_vport_delete);


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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;
}

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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;
}


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/**
 * 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 scsi_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 EH_RESET_TIMER;

	return EH_NOT_HANDLED;
}

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/*
 * Must be called with shost->host_lock held
 */
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static int fc_user_scan(struct Scsi_Host *shost, uint channel,
		uint id, uint lun)
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{
	struct fc_rport *rport;

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	list_for_each_entry(rport, &fc_host_rports(shost), peers) {
		if (rport->scsi_target_id == -1)
			continue;
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		if ((channel == SCAN_WILD_CARD || channel == rport->channel) &&
		    (id == SCAN_WILD_CARD || id == rport->scsi_target_id)) {
			scsi_scan_target(&rport->dev, rport->channel,
					 rport->scsi_target_id, lun, 1);
		}
	}

	return 0;
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}

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

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	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);

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	i->f = ft;

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

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	i->t.user_scan = fc_user_scan;
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	/*
	 * 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);
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	SETUP_HOST_ATTRIBUTE_RD(permanent_port_name);
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	SETUP_HOST_ATTRIBUTE_RD(supported_classes);
	SETUP_HOST_ATTRIBUTE_RD(supported_fc4s);
	SETUP_HOST_ATTRIBUTE_RD(supported_speeds);
	SETUP_HOST_ATTRIBUTE_RD(maxframe_size);
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	if (ft->vport_create) {
		SETUP_HOST_ATTRIBUTE_RD_NS(max_npiv_vports);
		SETUP_HOST_ATTRIBUTE_RD_NS(npiv_vports_inuse);
	}
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	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);
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	SETUP_HOST_ATTRIBUTE_RD(symbolic_name);
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	SETUP_HOST_ATTRIBUTE_RW(system_hostname);
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	/* Transport-managed attributes */
	SETUP_PRIVATE_HOST_ATTRIBUTE_RW(tgtid_bind_type);
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	if (ft->issue_fc_host_lip)
		SETUP_PRIVATE_HOST_ATTRIBUTE_RW(issue_lip);
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	if (ft->vport_create)
		SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_create);
	if (ft->vport_delete)
		SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_delete);
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	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);
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	if (ft->terminate_rport_io)
		SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(fast_io_fail_tmo);
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	BUG_ON(count > FC_RPORT_NUM_ATTRS);

	i->rport_attrs[count] = NULL;

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	/*
	 * 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;

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	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);
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	transport_container_unregister(&i->vport_attr_cont);
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	kfree(i);
}
EXPORT_SYMBOL(fc_release_transport);

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/**
 * 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:
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 * 	1 - work queued for execution
 *	0 - work is already queued
 *	-EINVAL - work queue doesn't exist
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 **/
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:
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 * 	1 on success / 0 already queued / < 0 for error
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 **/
static int
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fc_queue_devloss_work(struct Scsi_Host *shost, struct delayed_work *work,
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				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));
}

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/**
 * fc_remove_host - called to terminate any fc_transport-related elements
 *                  for a scsi host.
 * @rport:	remote port to be unblocked.
 *
 * 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_remote_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)
{
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	struct fc_vport *vport = NULL, *next_vport = NULL;
	struct fc_rport *rport = NULL, *next_rport = NULL;
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	struct workqueue_struct *work_q;
	struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
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	unsigned long flags;
	int stat;

	spin_lock_irqsave(shost->host_lock, flags);

	/* Remove any vports */
	list_for_each_entry_safe(vport, next_vport, &fc_host->vports, peers) {
		spin_unlock_irqrestore(shost->host_lock, flags);
		/* this must be called synchronously */
		stat = fc_vport_terminate(vport);
		spin_lock_irqsave(shost->host_lock, flags);
		if (stat)
			dev_printk(KERN_ERR, vport->dev.parent,
				"%s: %s could not be deleted created via "
				"shost%d channel %d\n", __FUNCTION__,
				vport->dev.bus_id, vport->shost->host_no,
				vport->channel);
	}
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	/* Remove any remote ports */
	list_for_each_entry_safe(rport, next_rport,
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			&fc_host->rports, peers) {
		list_del(&rport->peers);
		rport->port_state = FC_PORTSTATE_DELETED;
		fc_queue_work(shost, &rport->rport_delete_work);
	}

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

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	spin_unlock_irqrestore(shost->host_lock, flags);

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	/* 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);
	}
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}
EXPORT_SYMBOL(fc_remove_host);

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

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

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