scsi_transport_fc.c 121 KB
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/*
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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...
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 *    Add vports, etc
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 *
 */
#include <linux/module.h>
#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/delay.h>
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#include <linux/kernel.h>
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#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 <net/netlink.h>
#include <scsi/scsi_netlink_fc.h>
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#include <scsi/scsi_bsg_fc.h>
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#include "scsi_priv.h"
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#include "scsi_transport_fc_internal.h"
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static int fc_queue_work(struct Scsi_Host *, struct work_struct *);
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static void fc_vport_sched_delete(struct work_struct *work);
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static int fc_vport_setup(struct Scsi_Host *shost, int channel,
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	struct device *pdev, struct fc_vport_identifiers  *ids,
	struct fc_vport **vport);
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static int fc_bsg_hostadd(struct Scsi_Host *, struct fc_host_attrs *);
static int fc_bsg_rportadd(struct Scsi_Host *, struct fc_rport *);
static void fc_bsg_remove(struct request_queue *);
static void fc_bsg_goose_queue(struct fc_rport *);
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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.
 */
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 if"
		 " fast_io_fail_tmo is not set.");

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/*
 * Redefine so that we can have same named attributes in the
 * sdev/starget/host objects.
 */
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#define FC_DEVICE_ATTR(_prefix,_name,_mode,_show,_store)		\
struct device_attribute device_attr_##_prefix##_##_name = 	\
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	__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)" },
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	{ 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
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#define FC_HOST_NUM_ATTRS	29
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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.
	 */
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	struct device_attribute private_starget_attrs[
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							FC_STARGET_NUM_ATTRS];
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	struct device_attribute *starget_attrs[FC_STARGET_NUM_ATTRS + 1];
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	struct device_attribute private_host_attrs[FC_HOST_NUM_ATTRS];
	struct device_attribute *host_attrs[FC_HOST_NUM_ATTRS + 1];
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	struct transport_container rport_attr_cont;
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	struct device_attribute private_rport_attrs[FC_RPORT_NUM_ATTRS];
	struct device_attribute *rport_attrs[FC_RPORT_NUM_ATTRS + 1];
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	struct transport_container vport_attr_cont;
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	struct device_attribute private_vport_attrs[FC_VPORT_NUM_ATTRS];
	struct 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,
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			   struct 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,
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			 struct 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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	/*
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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));
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	memset(fc_host->manufacturer, 0,
		sizeof(fc_host->manufacturer));
	memset(fc_host->model, 0,
		sizeof(fc_host->model));
	memset(fc_host->model_description, 0,
		sizeof(fc_host->model_description));
	memset(fc_host->hardware_version, 0,
		sizeof(fc_host->hardware_version));
	memset(fc_host->driver_version, 0,
		sizeof(fc_host->driver_version));
	memset(fc_host->firmware_version, 0,
		sizeof(fc_host->firmware_version));
	memset(fc_host->optionrom_version, 0,
		sizeof(fc_host->optionrom_version));
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	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, sizeof(fc_host->work_q_name),
		 "fc_wq_%d", shost->host_no);
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	fc_host->work_q = alloc_workqueue("%s", 0, 0, fc_host->work_q_name);
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	if (!fc_host->work_q)
		return -ENOMEM;

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	fc_host->dev_loss_tmo = fc_dev_loss_tmo;
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	snprintf(fc_host->devloss_work_q_name,
		 sizeof(fc_host->devloss_work_q_name),
		 "fc_dl_%d", shost->host_no);
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	fc_host->devloss_work_q = alloc_workqueue("%s", 0, 0,
					fc_host->devloss_work_q_name);
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	if (!fc_host->devloss_work_q) {
		destroy_workqueue(fc_host->work_q);
		fc_host->work_q = NULL;
		return -ENOMEM;
	}

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

	return 0;
}

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

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

static DECLARE_TRANSPORT_CLASS(fc_host_class,
			       "fc_host",
			       fc_host_setup,
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			       fc_host_remove,
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			       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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/*
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 * Netlink Infrastructure
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 */
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static atomic_t fc_event_seq;

/**
 * fc_get_event_number - Obtain the next sequential FC event number
 *
 * Notes:
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 *   We could have inlined this, but it would have required fc_event_seq to
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 *   be exposed. For now, live with the subroutine call.
 *   Atomic used to avoid lock/unlock...
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 */
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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.
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 */
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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;
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	u32 len;
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	int err;

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

	len = FC_NL_MSGALIGN(sizeof(*event));

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

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	nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG, len, 0);
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	if (!nlh) {
		err = -ENOBUFS;
		goto send_fail_skb;
	}
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	event = nlmsg_data(nlh);
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	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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	nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
			GFP_KERNEL);
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	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",
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		__func__, shost->host_no,
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		(name) ? name : "<unknown>", event_data, err);
	return;
}
EXPORT_SYMBOL(fc_host_post_event);


/**
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 * fc_host_post_vendor_event - called to post a vendor unique event on an fc_host
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 * @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
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 * @vendor_id:          Vendor id
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 *
 * Notes:
 *	This routine assumes no locks are held on entry.
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 */
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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;
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	u32 len;
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	int err;

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

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

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

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	nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG, len, 0);
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	if (!nlh) {
		err = -ENOBUFS;
		goto send_vendor_fail_skb;
	}
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	event = nlmsg_data(nlh);
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	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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	nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
			GFP_KERNEL);
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	return;

send_vendor_fail_skb:
	kfree_skb(skb);
send_vendor_fail:
	printk(KERN_WARNING
		"%s: Dropped Event : host %d vendor_unique - err %d\n",
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		__func__, shost->host_no, err);
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	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)
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		goto unreg_host_class;
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	error = transport_class_register(&fc_rport_class);
	if (error)
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		goto unreg_vport_class;
	error = transport_class_register(&fc_transport_class);
	if (error)
		goto unreg_rport_class;
	return 0;

unreg_rport_class:
	transport_class_unregister(&fc_rport_class);
unreg_vport_class:
	transport_class_unregister(&fc_vport_class);
unreg_host_class:
	transport_class_unregister(&fc_host_class);
	return error;
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}

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								\
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show_fc_rport_##field (struct device *dev, 				\
		       struct device_attribute *attr, char *buf)	\
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{									\
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	struct fc_rport *rport = transport_class_to_rport(dev);		\
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	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								\
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store_fc_rport_##field(struct device *dev,				\
		       struct device_attribute *attr,			\
		       const char *buf,	size_t count)			\
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{									\
	int val;							\
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	struct fc_rport *rport = transport_class_to_rport(dev);		\
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	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, )		\
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static FC_DEVICE_ATTR(rport, field, S_IRUGO,			\
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			 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))	\
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static FC_DEVICE_ATTR(rport, field, S_IRUGO,			\
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			  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)					\
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static FC_DEVICE_ATTR(rport, field, S_IRUGO | S_IWUSR,		\
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			show_fc_rport_##field,				\
			store_fc_rport_##field)


#define fc_private_rport_show_function(field, format_string, sz, cast)	\
static ssize_t								\
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show_fc_rport_##field (struct device *dev, 				\
		       struct device_attribute *attr, char *buf)	\
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{									\
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	struct fc_rport *rport = transport_class_to_rport(dev);		\
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	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, )	\
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static FC_DEVICE_ATTR(rport, field, S_IRUGO,			\
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			 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)) \
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static FC_DEVICE_ATTR(rport, field, S_IRUGO,			\
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			  show_fc_rport_##field, NULL)


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


#define SETUP_RPORT_ATTRIBUTE_RD(field)					\
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	i->private_rport_attrs[count] = device_attr_rport_##field; \
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	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)				\
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	i->private_rport_attrs[count] = device_attr_rport_##field; \
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	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)					\
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	i->private_rport_attrs[count] = device_attr_rport_##field; \
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	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)				\
{									\
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	i->private_rport_attrs[count] = device_attr_rport_##field; \
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	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
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show_fc_rport_supported_classes (struct device *dev,
				 struct device_attribute *attr, char *buf)
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{
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	struct fc_rport *rport = transport_class_to_rport(dev);
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	if (rport->supported_classes == FC_COS_UNSPECIFIED)
		return snprintf(buf, 20, "unspecified\n");
	return get_fc_cos_names(rport->supported_classes, buf);
}
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static FC_DEVICE_ATTR(rport, supported_classes, S_IRUGO,
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		show_fc_rport_supported_classes, NULL);

/* Dynamic Remote Port Attributes */

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/*
 * dev_loss_tmo attribute
 */
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static int fc_str_to_dev_loss(const char *buf, unsigned long *val)
{
	char *cp;

	*val = simple_strtoul(buf, &cp, 0);
	if ((*cp && (*cp != '\n')) || (*val < 0))
		return -EINVAL;
	/*
	 * Check for overflow; dev_loss_tmo is u32
	 */
	if (*val > UINT_MAX)
		return -EINVAL;

	return 0;
}

static int fc_rport_set_dev_loss_tmo(struct fc_rport *rport,
				     unsigned long val)
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{
	struct Scsi_Host *shost = rport_to_shost(rport);
	struct fc_internal *i = to_fc_internal(shost->transportt);
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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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	/*
	 * Check for overflow; dev_loss_tmo is u32
	 */
	if (val > UINT_MAX)
		return -EINVAL;

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	/*
	 * If fast_io_fail is off we have to cap
	 * dev_loss_tmo at SCSI_DEVICE_BLOCK_MAX_TIMEOUT
	 */
	if (rport->fast_io_fail_tmo == -1 &&
	    val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT)
		return -EINVAL;

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	i->f->set_rport_dev_loss_tmo(rport, val);
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	return 0;
}

fc_rport_show_function(dev_loss_tmo, "%d\n", 20, )
static ssize_t
store_fc_rport_dev_loss_tmo(struct device *dev, struct device_attribute *attr,
			    const char *buf, size_t count)
{
	struct fc_rport *rport = transport_class_to_rport(dev);
	unsigned long val;
	int rc;

	rc = fc_str_to_dev_loss(buf, &val);
	if (rc)
		return rc;

	rc = fc_rport_set_dev_loss_tmo(rport, val);
	if (rc)
		return rc;
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	return count;
}
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static FC_DEVICE_ATTR(rport, dev_loss_tmo, S_IRUGO | S_IWUSR,
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		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
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show_fc_rport_roles (struct device *dev, struct device_attribute *attr,
		     char *buf)
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{
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	struct fc_rport *rport = transport_class_to_rport(dev);
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	/* 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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	}
}
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static FC_DEVICE_ATTR(rport, roles, S_IRUGO,
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		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
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show_fc_rport_fast_io_fail_tmo (struct device *dev,
				struct device_attribute *attr, char *buf)
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{
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	struct fc_rport *rport = transport_class_to_rport(dev);
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	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
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store_fc_rport_fast_io_fail_tmo(struct device *dev,
				struct device_attribute *attr, const char *buf,
				size_t count)
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{
	int val;
	char *cp;
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	struct fc_rport *rport = transport_class_to_rport(dev);
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	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);
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		if ((*cp && (*cp != '\n')) || (val < 0))
			return -EINVAL;
		/*
		 * Cap fast_io_fail by dev_loss_tmo or
		 * SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
		 */
		if ((val >= rport->dev_loss_tmo) ||
		    (val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT))
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			return -EINVAL;
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		rport->fast_io_fail_tmo = val;
	}
	return count;
}
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static FC_DEVICE_ATTR(rport, fast_io_fail_tmo, S_IRUGO | S_IWUSR,
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	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 hierarchy 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								\
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show_fc_starget_##field (struct device *dev, 				\
			 struct device_attribute *attr, char *buf)	\
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{									\
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	struct scsi_target *starget = transport_class_to_starget(dev);	\
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	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, )		\
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static FC_DEVICE_ATTR(starget, field, S_IRUGO,			\
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			 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))	\
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static FC_DEVICE_ATTR(starget, field, S_IRUGO,			\
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			  show_fc_starget_##field, NULL)

#define SETUP_STARGET_ATTRIBUTE_RD(field)				\
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	i->private_starget_attrs[count] = device_attr_starget_##field; \
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	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)				\
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	i->private_starget_attrs[count] = device_attr_starget_##field; \
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	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								\
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show_fc_vport_##field (struct device *dev, 				\
		       struct device_attribute *attr, char *buf)	\
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{									\
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	struct fc_vport *vport = transport_class_to_vport(dev);		\
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	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								\
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store_fc_vport_##field(struct device *dev,				\
		       struct device_attribute *attr,			\
		       const char *buf,	size_t count)			\
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{									\
	int val;							\
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	struct fc_vport *vport = transport_class_to_vport(dev);		\
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	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								\
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store_fc_vport_##field(struct device *dev,				\
		       struct device_attribute *attr, 			\
		       const char *buf,	size_t count)			\
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{									\
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	struct fc_vport *vport = transport_class_to_vport(dev);		\
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	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, )		\
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static FC_DEVICE_ATTR(vport, field, S_IRUGO,			\
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			 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))	\
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static FC_DEVICE_ATTR(vport, field, S_IRUGO,			\
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			  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)					\
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static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR,		\
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			show_fc_vport_##field,				\
			store_fc_vport_##field)

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

#define fc_private_vport_store_u32_function(field)			\
static ssize_t								\
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store_fc_vport_##field(struct device *dev,				\
		       struct device_attribute *attr,			\
		       const char *buf,	size_t count)			\
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{									\
	u32 val;							\
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	struct fc_vport *vport = transport_class_to_vport(dev);		\
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	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, )	\
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static FC_DEVICE_ATTR(vport, field, S_IRUGO,			\
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			 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)) \
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static FC_DEVICE_ATTR(vport, field, S_IRUGO,			\
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			  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)			\
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static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR,		\
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			show_fc_vport_##field,				\
			store_fc_vport_##field)


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


#define SETUP_VPORT_ATTRIBUTE_RD(field)					\
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	i->private_vport_attrs[count] = device_attr_vport_##field; \
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	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)				\
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	i->private_vport_attrs[count] = device_attr_vport_##field; \
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	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)					\
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	i->private_vport_attrs[count] = device_attr_vport_##field; \
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	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)					\
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	i->private_vport_attrs[count] = device_attr_vport_##field; \
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	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)				\
{									\
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	i->private_vport_attrs[count] = device_attr_vport_##field; \
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	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
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show_fc_vport_roles (struct device *dev, struct device_attribute *attr,
		     char *buf)
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{
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	struct fc_vport *vport = transport_class_to_vport(dev);
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	if (vport->roles == FC_PORT_ROLE_UNKNOWN)
		return snprintf(buf, 20, "unknown\n");
	return get_fc_port_roles_names(vport->roles, buf);
}
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static FC_DEVICE_ATTR(vport, roles, S_IRUGO, show_fc_vport_roles, NULL);
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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)
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static FC_DEVICE_ATTR(vport, symbolic_name, S_IRUGO | S_IWUSR,
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		show_fc_vport_symbolic_name, store_fc_vport_symbolic_name);

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

	spin_lock_irqsave(shost->host_lock, flags);
	if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) {
		spin_unlock_irqrestore(shost->host_lock, flags);
		return -EBUSY;
	}
	vport->flags |= FC_VPORT_DELETING;
	spin_unlock_irqrestore(shost->host_lock, flags);
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	fc_queue_work(shost, &vport->vport_delete_work);
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	return count;
}
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static FC_DEVICE_ATTR(vport, vport_delete, S_IWUSR,
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			NULL, store_fc_vport_delete);


/*
 * Enable/Disable vport
 *  Write "1" to disable, write "0" to enable
 */
static ssize_t
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store_fc_vport_disable(struct device *dev, struct device_attribute *attr,
		       const char *buf,
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			   size_t count)
{
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	struct fc_vport *vport = transport_class_to_vport(dev);
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	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;
}
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static FC_DEVICE_ATTR(vport, vport_disable, S_IWUSR,
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			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								\
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show_fc_host_##field (struct device *dev,				\
		      struct device_attribute *attr, char *buf)		\
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{									\
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	struct Scsi_Host *shost = transport_class_to_shost(dev);	\
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	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								\
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store_fc_host_##field(struct device *dev, 				\
		      struct device_attribute *attr,			\
		      const char *buf,	size_t count)			\
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{									\
	int val;							\
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	struct Scsi_Host *shost = transport_class_to_shost(dev);	\
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	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								\
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store_fc_host_##field(struct device *dev,				\
		      struct device_attribute *attr,			\
		      const char *buf, size_t count)			\
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{									\
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	struct Scsi_Host *shost = transport_class_to_shost(dev);	\
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	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, )		\
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static FC_DEVICE_ATTR(host, field, S_IRUGO,			\
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			 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))		\
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static FC_DEVICE_ATTR(host, field, S_IRUGO,			\
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			  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)					\
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static FC_DEVICE_ATTR(host, field, S_IRUGO | S_IWUSR,		\
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			show_fc_host_##field,				\
			store_fc_host_##field)

#define fc_host_rd_enum_attr(title, maxlen)				\
static ssize_t								\
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show_fc_host_##title (struct device *dev,				\
		      struct device_attribute *attr, char *buf)		\
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{									\
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	struct Scsi_Host *shost = transport_class_to_shost(dev);	\
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	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);			\
}									\
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static FC_DEVICE_ATTR(host, title, S_IRUGO, show_fc_host_##title, NULL)
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#define SETUP_HOST_ATTRIBUTE_RD(field)					\
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	i->private_host_attrs[count] = device_attr_host_##field;	\
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	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)				\
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	i->private_host_attrs[count] = device_attr_host_##field;	\
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	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)					\
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	i->private_host_attrs[count] = device_attr_host_##field;	\
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	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								\
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show_fc_host_##field (struct device *dev,				\
		      struct device_attribute *attr, char *buf)		\
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{									\
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	struct Scsi_Host *shost = transport_class_to_shost(dev);	\
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	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, )	\
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static FC_DEVICE_ATTR(host, field, S_IRUGO,			\
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			 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)) \
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static FC_DEVICE_ATTR(host, field, S_IRUGO,			\
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			  show_fc_host_##field, NULL)

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

static ssize_t
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show_fc_host_supported_classes (struct device *dev,
			        struct device_attribute *attr, char *buf)