drivers/scsi/scsi_transport_fc.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  FiberChannel transport specific attributes exported to sysfs.
 *
 *  Copyright (c) 2003 Silicon Graphics, Inc.  All rights reserved.
 *  Copyright (C) 2004-2007   James Smart, Emulex Corporation
 *    Rewrite for host, target, device, and remote port attributes,
 *    statistics, and service functions...
 *    Add vports, etc
 */
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/kernel.h>
#include <linux/bsg-lib.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_transport.h>
#include <scsi/scsi_transport_fc.h>
#include <scsi/scsi_cmnd.h>
#include <net/netlink.h>
#include <scsi/scsi_netlink_fc.h>
#include <scsi/scsi_bsg_fc.h>
#include <uapi/scsi/fc/fc_els.h>
#include "scsi_priv.h"

static int fc_queue_work(struct Scsi_Host *, struct work_struct *);
static void fc_vport_sched_delete(struct work_struct *work);
static int fc_vport_setup(struct Scsi_Host *shost, int channel,
	struct device *pdev, struct fc_vport_identifiers  *ids,
	struct fc_vport **vport);
static int fc_bsg_hostadd(struct Scsi_Host *, struct fc_host_attrs *);
static int fc_bsg_rportadd(struct Scsi_Host *, struct fc_rport *);
static void fc_bsg_remove(struct request_queue *);
static void fc_bsg_goose_queue(struct fc_rport *);
static void fc_li_stats_update(u16 event_type,
			       struct fc_fpin_stats *stats);
static void fc_delivery_stats_update(u32 reason_code,
				     struct fc_fpin_stats *stats);
static void fc_cn_stats_update(u16 event_type, struct fc_fpin_stats *stats);

/*
 * 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.");

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

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

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


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

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


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


/* Convert fc_port_state values to ascii string name */
static struct {
	enum fc_port_state	value;
	char			*name;
	int			matchlen;
} fc_port_state_names[] = {
	{ FC_PORTSTATE_UNKNOWN,		"Unknown", 7},
	{ FC_PORTSTATE_NOTPRESENT,	"Not Present", 11 },
	{ FC_PORTSTATE_ONLINE,		"Online", 6 },
	{ FC_PORTSTATE_OFFLINE,		"Offline", 7 },
	{ FC_PORTSTATE_BLOCKED,		"Blocked", 7 },
	{ FC_PORTSTATE_BYPASSED,	"Bypassed", 8 },
	{ FC_PORTSTATE_DIAGNOSTICS,	"Diagnostics", 11 },
	{ FC_PORTSTATE_LINKDOWN,	"Linkdown", 8 },
	{ FC_PORTSTATE_ERROR,		"Error", 5 },
	{ FC_PORTSTATE_LOOPBACK,	"Loopback", 8 },
	{ FC_PORTSTATE_DELETED,		"Deleted", 7 },
	{ FC_PORTSTATE_MARGINAL,	"Marginal", 8 },
};
fc_enum_name_search(port_state, fc_port_state, fc_port_state_names)
fc_enum_name_match(port_state, fc_port_state, fc_port_state_names)
#define FC_PORTSTATE_MAX_NAMELEN	20


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

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


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


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


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


/* Convert FC_PORTSPEED bit values to ascii string name */
static const struct {
	u32 			value;
	char			*name;
} fc_port_speed_names[] = {
	{ FC_PORTSPEED_1GBIT,		"1 Gbit" },
	{ FC_PORTSPEED_2GBIT,		"2 Gbit" },
	{ FC_PORTSPEED_4GBIT,		"4 Gbit" },
	{ FC_PORTSPEED_10GBIT,		"10 Gbit" },
	{ FC_PORTSPEED_8GBIT,		"8 Gbit" },
	{ FC_PORTSPEED_16GBIT,		"16 Gbit" },
	{ FC_PORTSPEED_32GBIT,		"32 Gbit" },
	{ FC_PORTSPEED_20GBIT,		"20 Gbit" },
	{ FC_PORTSPEED_40GBIT,		"40 Gbit" },
	{ FC_PORTSPEED_50GBIT,		"50 Gbit" },
	{ FC_PORTSPEED_100GBIT,		"100 Gbit" },
	{ FC_PORTSPEED_25GBIT,		"25 Gbit" },
	{ FC_PORTSPEED_64GBIT,		"64 Gbit" },
	{ FC_PORTSPEED_128GBIT,		"128 Gbit" },
	{ FC_PORTSPEED_256GBIT,		"256 Gbit" },
	{ FC_PORTSPEED_NOT_NEGOTIATED,	"Not Negotiated" },
};
fc_bitfield_name_search(port_speed, fc_port_speed_names)


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

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


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

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


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

/*
 * Attribute counts pre object type...
 * Increase these values if you add attributes
 */
#define FC_STARGET_NUM_ATTRS 	3
#define FC_RPORT_NUM_ATTRS	10
#define FC_VPORT_NUM_ATTRS	9
#define FC_HOST_NUM_ATTRS	29

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

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

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

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

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

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

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

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

	return 0;
}

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

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

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

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

	fc_host->tgtid_bind_type = FC_TGTID_BIND_BY_WWPN;

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

	snprintf(fc_host->work_q_name, sizeof(fc_host->work_q_name),
		 "fc_wq_%d", shost->host_no);
	fc_host->work_q = alloc_workqueue("%s", 0, 0, fc_host->work_q_name);
	if (!fc_host->work_q)
		return -ENOMEM;

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

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

	return 0;
}

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

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

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

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

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

/*
 * Netlink Infrastructure
 */

static atomic_t fc_event_seq;

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

/**
 * fc_host_post_fc_event - routine to do the work of posting an event
 *                      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
 * @data_len:		amount, in bytes, of event data
 * @data_buf:		pointer to event data
 * @vendor_id:          value for Vendor id
 *
 * Notes:
 *	This routine assumes no locks are held on entry.
 */
void
fc_host_post_fc_event(struct Scsi_Host *shost, u32 event_number,
		enum fc_host_event_code event_code,
		u32 data_len, char *data_buf, u64 vendor_id)
{
	struct sk_buff *skb;
	struct nlmsghdr	*nlh;
	struct fc_nl_event *event;
	const char *name;
	size_t len, padding;
	int err;

	if (!data_buf || data_len < 4)
		data_len = 0;

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

	len = FC_NL_MSGALIGN(sizeof(*event) - sizeof(event->event_data) + data_len);

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

	nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG, len, 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 = ktime_get_real_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 = event_code;
	if (data_len)
		memcpy(event->event_data_flex, data_buf, data_len);
	padding = len - offsetof(typeof(*event), event_data_flex) - data_len;
	memset(event->event_data_flex + data_len, 0, padding);

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

send_fail_skb:
	kfree_skb(skb);
send_fail:
	name = get_fc_host_event_code_name(event_code);
	printk(KERN_WARNING
		"%s: Dropped Event : host %d %s data 0x%08x - err %d\n",
		__func__, shost->host_no,
		(name) ? name : "<unknown>",
		(data_len) ? *((u32 *)data_buf) : 0xFFFFFFFF, err);
	return;
}
EXPORT_SYMBOL(fc_host_post_fc_event);

/**
 * 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)
{
	fc_host_post_fc_event(shost, event_number, event_code,
		(u32)sizeof(u32), (char *)&event_data, 0);
}
EXPORT_SYMBOL(fc_host_post_event);


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

/**
 * fc_find_rport_by_wwpn - find the fc_rport pointer for a given wwpn
 * @shost:		host the fc_rport is associated with
 * @wwpn:		wwpn of the fc_rport device
 *
 * Notes:
 *	This routine assumes no locks are held on entry.
 */
struct fc_rport *
fc_find_rport_by_wwpn(struct Scsi_Host *shost, u64 wwpn)
{
	struct fc_rport *rport;
	unsigned long flags;

	spin_lock_irqsave(shost->host_lock, flags);

	list_for_each_entry(rport, &fc_host_rports(shost), peers) {
		if (rport->port_state != FC_PORTSTATE_ONLINE)
			continue;

		if (rport->port_name == wwpn) {
			spin_unlock_irqrestore(shost->host_lock, flags);
			return rport;
		}
	}

	spin_unlock_irqrestore(shost->host_lock, flags);
	return NULL;
}
EXPORT_SYMBOL(fc_find_rport_by_wwpn);

static void
fc_li_stats_update(u16 event_type,
		   struct fc_fpin_stats *stats)
{
	stats->li++;
	switch (event_type) {
	case FPIN_LI_UNKNOWN:
		stats->li_failure_unknown++;
		break;
	case FPIN_LI_LINK_FAILURE:
		stats->li_link_failure_count++;
		break;
	case FPIN_LI_LOSS_OF_SYNC:
		stats->li_loss_of_sync_count++;
		break;
	case FPIN_LI_LOSS_OF_SIG:
		stats->li_loss_of_signals_count++;
		break;
	case FPIN_LI_PRIM_SEQ_ERR:
		stats->li_prim_seq_err_count++;
		break;
	case FPIN_LI_INVALID_TX_WD:
		stats->li_invalid_tx_word_count++;
		break;
	case FPIN_LI_INVALID_CRC:
		stats->li_invalid_crc_count++;
		break;
	case FPIN_LI_DEVICE_SPEC:
		stats->li_device_specific++;
		break;
	}
}

static void
fc_delivery_stats_update(u32 reason_code, struct fc_fpin_stats *stats)
{
	stats->dn++;
	switch (reason_code) {
	case FPIN_DELI_UNKNOWN:
		stats->dn_unknown++;
		break;
	case FPIN_DELI_TIMEOUT:
		stats->dn_timeout++;
		break;
	case FPIN_DELI_UNABLE_TO_ROUTE:
		stats->dn_unable_to_route++;
		break;
	case FPIN_DELI_DEVICE_SPEC:
		stats->dn_device_specific++;
		break;
	}
}

static void
fc_cn_stats_update(u16 event_type, struct fc_fpin_stats *stats)
{
	stats->cn++;
	switch (event_type) {
	case FPIN_CONGN_CLEAR:
		stats->cn_clear++;
		break;
	case FPIN_CONGN_LOST_CREDIT:
		stats->cn_lost_credit++;
		break;
	case FPIN_CONGN_CREDIT_STALL:
		stats->cn_credit_stall++;
		break;
	case FPIN_CONGN_OVERSUBSCRIPTION:
		stats->cn_oversubscription++;
		break;
	case FPIN_CONGN_DEVICE_SPEC:
		stats->cn_device_specific++;
	}
}

/*
 * fc_fpin_li_stats_update - routine to update Link Integrity
 * event statistics.
 * @shost:		host the FPIN was received on
 * @tlv:		pointer to link integrity descriptor
 *
 */
static void
fc_fpin_li_stats_update(struct Scsi_Host *shost, struct fc_tlv_desc *tlv)
{
	u8 i;
	struct fc_rport *rport = NULL;
	struct fc_rport *attach_rport = NULL;
	struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
	struct fc_fn_li_desc *li_desc = (struct fc_fn_li_desc *)tlv;
	u16 event_type = be16_to_cpu(li_desc->event_type);
	u64 wwpn;

	rport = fc_find_rport_by_wwpn(shost,
				      be64_to_cpu(li_desc->attached_wwpn));
	if (rport &&
	    (rport->roles & FC_PORT_ROLE_FCP_TARGET ||
	     rport->roles & FC_PORT_ROLE_NVME_TARGET)) {
		attach_rport = rport;
		fc_li_stats_update(event_type, &attach_rport->fpin_stats);
	}

	if (be32_to_cpu(li_desc->pname_count) > 0) {
		for (i = 0;
		    i < be32_to_cpu(li_desc->pname_count);
		    i++) {
			wwpn = be64_to_cpu(li_desc->pname_list[i]);
			rport = fc_find_rport_by_wwpn(shost, wwpn);
			if (rport &&
			    (rport->roles & FC_PORT_ROLE_FCP_TARGET ||
			    rport->roles & FC_PORT_ROLE_NVME_TARGET)) {
				if (rport == attach_rport)
					continue;
				fc_li_stats_update(event_type,
						   &rport->fpin_stats);
			}
		}
	}

	if (fc_host->port_name == be64_to_cpu(li_desc->attached_wwpn))
		fc_li_stats_update(event_type, &fc_host->fpin_stats);
}

/*
 * fc_fpin_delivery_stats_update - routine to update Delivery Notification
 * event statistics.
 * @shost:		host the FPIN was received on
 * @tlv:		pointer to delivery descriptor
 *
 */
static void
fc_fpin_delivery_stats_update(struct Scsi_Host *shost,
			      struct fc_tlv_desc *tlv)
{
	struct fc_rport *rport = NULL;
	struct fc_rport *attach_rport = NULL;
	struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
	struct fc_fn_deli_desc *dn_desc = (struct fc_fn_deli_desc *)tlv;
	u32 reason_code = be32_to_cpu(dn_desc->deli_reason_code);

	rport = fc_find_rport_by_wwpn(shost,
				      be64_to_cpu(dn_desc->attached_wwpn));
	if (rport &&
	    (rport->roles & FC_PORT_ROLE_FCP_TARGET ||
	     rport->roles & FC_PORT_ROLE_NVME_TARGET)) {
		attach_rport = rport;
		fc_delivery_stats_update(reason_code,
					 &attach_rport->fpin_stats);
	}

	if (fc_host->port_name == be64_to_cpu(dn_desc->attached_wwpn))
		fc_delivery_stats_update(reason_code, &fc_host->fpin_stats);
}

/*
 * fc_fpin_peer_congn_stats_update - routine to update Peer Congestion
 * event statistics.
 * @shost:		host the FPIN was received on
 * @tlv:		pointer to peer congestion descriptor
 *
 */
static void
fc_fpin_peer_congn_stats_update(struct Scsi_Host *shost,
				struct fc_tlv_desc *tlv)
{
	u8 i;
	struct fc_rport *rport = NULL;
	struct fc_rport *attach_rport = NULL;
	struct fc_fn_peer_congn_desc *pc_desc =
	    (struct fc_fn_peer_congn_desc *)tlv;
	u16 event_type = be16_to_cpu(pc_desc->event_type);
	u64 wwpn;

	rport = fc_find_rport_by_wwpn(shost,
				      be64_to_cpu(pc_desc->attached_wwpn));
	if (rport &&
	    (rport->roles & FC_PORT_ROLE_FCP_TARGET ||
	     rport->roles & FC_PORT_ROLE_NVME_TARGET)) {
		attach_rport = rport;
		fc_cn_stats_update(event_type, &attach_rport->fpin_stats);
	}

	if (be32_to_cpu(pc_desc->pname_count) > 0) {
		for (i = 0;
		    i < be32_to_cpu(pc_desc->pname_count);
		    i++) {
			wwpn = be64_to_cpu(pc_desc->pname_list[i]);
			rport = fc_find_rport_by_wwpn(shost, wwpn);
			if (rport &&
			    (rport->roles & FC_PORT_ROLE_FCP_TARGET ||
			     rport->roles & FC_PORT_ROLE_NVME_TARGET)) {
				if (rport == attach_rport)
					continue;
				fc_cn_stats_update(event_type,
						   &rport->fpin_stats);
			}
		}
	}
}

/*
 * fc_fpin_congn_stats_update - routine to update Congestion
 * event statistics.
 * @shost:		host the FPIN was received on
 * @tlv:		pointer to congestion descriptor
 *
 */
static void
fc_fpin_congn_stats_update(struct Scsi_Host *shost,
			   struct fc_tlv_desc *tlv)
{
	struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
	struct fc_fn_congn_desc *congn = (struct fc_fn_congn_desc *)tlv;

	fc_cn_stats_update(be16_to_cpu(congn->event_type),
			   &fc_host->fpin_stats);
}

/**
 * fc_host_fpin_rcv - routine to process a received FPIN.
 * @shost:		host the FPIN was received on
 * @fpin_len:		length of FPIN payload, in bytes
 * @fpin_buf:		pointer to FPIN payload
 * @event_acknowledge:	1, if LLDD handles this event.
 * Notes:
 *	This routine assumes no locks are held on entry.
 */
void
fc_host_fpin_rcv(struct Scsi_Host *shost, u32 fpin_len, char *fpin_buf,
		u8 event_acknowledge)
{
	struct fc_els_fpin *fpin = (struct fc_els_fpin *)fpin_buf;
	struct fc_tlv_desc *tlv;
	u32 bytes_remain;
	u32 dtag;
	enum fc_host_event_code event_code =
		event_acknowledge ? FCH_EVT_LINK_FPIN_ACK : FCH_EVT_LINK_FPIN;

	/* Update Statistics */
	tlv = (struct fc_tlv_desc *)&fpin->fpin_desc[0];
	bytes_remain = fpin_len - offsetof(struct fc_els_fpin, fpin_desc);
	bytes_remain = min_t(u32, bytes_remain, be32_to_cpu(fpin->desc_len));

	while (bytes_remain >= FC_TLV_DESC_HDR_SZ &&
	       bytes_remain >= FC_TLV_DESC_SZ_FROM_LENGTH(tlv)) {
		dtag = be32_to_cpu(tlv->desc_tag);
		switch (dtag) {
		case ELS_DTAG_LNK_INTEGRITY:
			fc_fpin_li_stats_update(shost, tlv);
			break;
		case ELS_DTAG_DELIVERY:
			fc_fpin_delivery_stats_update(shost, tlv);
			break;
		case ELS_DTAG_PEER_CONGEST:
			fc_fpin_peer_congn_stats_update(shost, tlv);
			break;
		case ELS_DTAG_CONGESTION:
			fc_fpin_congn_stats_update(shost, tlv);
		}

		bytes_remain -= FC_TLV_DESC_SZ_FROM_LENGTH(tlv);
		tlv = fc_tlv_next_desc(tlv);
	}

	fc_host_post_fc_event(shost, fc_get_event_number(),
				event_code, fpin_len, fpin_buf, 0);
}
EXPORT_SYMBOL(fc_host_fpin_rcv);


static __init int fc_transport_init(void)
{
	int error;

	atomic_set(&fc_event_seq, 0);

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

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

/*
 * FC Remote Port Attribute Management
 */

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

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

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

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

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


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

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

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


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


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

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

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

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


/* The FC Transport Remote Port Attributes: */

/* Fixed Remote Port Attributes */

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

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

/* Dynamic Remote Port Attributes */

/*
 * dev_loss_tmo attribute
 */
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'))
		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)
{
	struct Scsi_Host *shost = rport_to_shost(rport);
	struct fc_internal *i = to_fc_internal(shost->transportt);

	if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
	    (rport->port_state == FC_PORTSTATE_DELETED) ||
	    (rport->port_state == FC_PORTSTATE_NOTPRESENT))
		return -EBUSY;
	/*
	 * Check for overflow; dev_loss_tmo is u32
	 */
	if (val > UINT_MAX)
		return -EINVAL;

	/*
	 * 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;

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

fc_rport_show_function(dev_loss_tmo, "%u\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;
	return count;
}
static FC_DEVICE_ATTR(rport, dev_loss_tmo, S_IRUGO | S_IWUSR,
		show_fc_rport_dev_loss_tmo, store_fc_rport_dev_loss_tmo);


/* Private Remote Port Attributes */

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

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

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

static ssize_t fc_rport_set_marginal_state(struct device *dev,
						struct device_attribute *attr,
						const char *buf, size_t count)
{
	struct fc_rport *rport = transport_class_to_rport(dev);
	enum fc_port_state port_state;
	int ret = 0;

	ret = get_fc_port_state_match(buf, &port_state);
	if (ret)
		return -EINVAL;
	if (port_state == FC_PORTSTATE_MARGINAL) {
		/*
		 * Change the state to Marginal only if the
		 * current rport state is Online
		 * Allow only Online->Marginal
		 */
		if (rport->port_state == FC_PORTSTATE_ONLINE)
			rport->port_state = port_state;
		else
			return -EINVAL;
	} else if (port_state == FC_PORTSTATE_ONLINE) {
		/*
		 * Change the state to Online only if the
		 * current rport state is Marginal
		 * Allow only Marginal->Online
		 */
		if (rport->port_state == FC_PORTSTATE_MARGINAL)
			rport->port_state = port_state;
		else
			return -EINVAL;
	} else
		return -EINVAL;
	return count;
}

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

	name = get_fc_port_state_name(rport->port_state);
	if (!name)
		return -EINVAL;

	return snprintf(buf, 20, "%s\n", name);
}

static FC_DEVICE_ATTR(rport, port_state, 0444 | 0200,
			show_fc_rport_port_state, fc_rport_set_marginal_state);

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

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

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

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

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

		rport->fast_io_fail_tmo = val;
	}
	return count;
}
static FC_DEVICE_ATTR(rport, fast_io_fail_tmo, S_IRUGO | S_IWUSR,
	show_fc_rport_fast_io_fail_tmo, store_fc_rport_fast_io_fail_tmo);

#define fc_rport_fpin_statistic(name)					\
static ssize_t fc_rport_fpinstat_##name(struct device *cd,		\
				  struct device_attribute *attr,	\
				  char *buf)				\
{									\
	struct fc_rport *rport = transport_class_to_rport(cd);		\
									\
	return snprintf(buf, 20, "0x%llx\n", rport->fpin_stats.name);	\
}									\
static FC_DEVICE_ATTR(rport, fpin_##name, 0444, fc_rport_fpinstat_##name, NULL)

fc_rport_fpin_statistic(dn);
fc_rport_fpin_statistic(dn_unknown);
fc_rport_fpin_statistic(dn_timeout);
fc_rport_fpin_statistic(dn_unable_to_route);
fc_rport_fpin_statistic(dn_device_specific);
fc_rport_fpin_statistic(cn);
fc_rport_fpin_statistic(cn_clear);
fc_rport_fpin_statistic(cn_lost_credit);
fc_rport_fpin_statistic(cn_credit_stall);
fc_rport_fpin_statistic(cn_oversubscription);
fc_rport_fpin_statistic(cn_device_specific);
fc_rport_fpin_statistic(li);
fc_rport_fpin_statistic(li_failure_unknown);
fc_rport_fpin_statistic(li_link_failure_count);
fc_rport_fpin_statistic(li_loss_of_sync_count);
fc_rport_fpin_statistic(li_loss_of_signals_count);
fc_rport_fpin_statistic(li_prim_seq_err_count);
fc_rport_fpin_statistic(li_invalid_tx_word_count);
fc_rport_fpin_statistic(li_invalid_crc_count);
fc_rport_fpin_statistic(li_device_specific);

static struct attribute *fc_rport_statistics_attrs[] = {
	&device_attr_rport_fpin_dn.attr,
	&device_attr_rport_fpin_dn_unknown.attr,
	&device_attr_rport_fpin_dn_timeout.attr,
	&device_attr_rport_fpin_dn_unable_to_route.attr,
	&device_attr_rport_fpin_dn_device_specific.attr,
	&device_attr_rport_fpin_li.attr,
	&device_attr_rport_fpin_li_failure_unknown.attr,
	&device_attr_rport_fpin_li_link_failure_count.attr,
	&device_attr_rport_fpin_li_loss_of_sync_count.attr,
	&device_attr_rport_fpin_li_loss_of_signals_count.attr,
	&device_attr_rport_fpin_li_prim_seq_err_count.attr,
	&device_attr_rport_fpin_li_invalid_tx_word_count.attr,
	&device_attr_rport_fpin_li_invalid_crc_count.attr,
	&device_attr_rport_fpin_li_device_specific.attr,
	&device_attr_rport_fpin_cn.attr,
	&device_attr_rport_fpin_cn_clear.attr,
	&device_attr_rport_fpin_cn_lost_credit.attr,
	&device_attr_rport_fpin_cn_credit_stall.attr,
	&device_attr_rport_fpin_cn_oversubscription.attr,
	&device_attr_rport_fpin_cn_device_specific.attr,
	NULL
};

static struct attribute_group fc_rport_statistics_group = {
	.name = "statistics",
	.attrs = fc_rport_statistics_attrs,
};


/*
 * FC SCSI Target Attribute Management
 */

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

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

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

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

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

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


/*
 * FC Virtual Port Attribute Management
 */

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

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

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

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

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

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

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

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


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

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

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


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


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

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

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

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

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


/* The FC Transport Virtual Port Attributes: */

/* Fixed Virtual Port Attributes */

/* Dynamic Virtual Port Attributes */

/* Private Virtual Port Attributes */

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

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

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

fc_private_vport_rd_enum_attr(vport_type, FC_PORTTYPE_MAX_NAMELEN);

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

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

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


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

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

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

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


/*
 * Host Attribute Management
 */

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

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

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

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

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

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

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

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

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

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


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

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

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

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

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


/* Fixed Host Attributes */

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

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

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

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

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

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

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


fc_private_host_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
fc_private_host_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
fc_private_host_rd_attr_cast(permanent_port_name, "0x%llx\n", 20,
			     unsigned long long);
fc_private_host_rd_attr(maxframe_size, "%u bytes\n", 20);
fc_private_host_rd_attr(max_npiv_vports, "%u\n", 20);
fc_private_host_rd_attr(serial_number, "%s\n", (FC_SERIAL_NUMBER_SIZE +1));
fc_private_host_rd_attr(manufacturer, "%s\n", FC_SERIAL_NUMBER_SIZE + 1);
fc_private_host_rd_attr(model, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
fc_private_host_rd_attr(model_description, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
fc_private_host_rd_attr(hardware_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
fc_private_host_rd_attr(driver_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
fc_private_host_rd_attr(firmware_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
fc_private_host_rd_attr(optionrom_version, "%s\n", FC_VERSION_STRING_SIZE + 1);


/* Dynamic Host Attributes */

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

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

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

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

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

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

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


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

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


/* Private Host Attributes */

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

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

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

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

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

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

	fc_host_tgtid_bind_type(shost) = val;
	return count;
}

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

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

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

	return -ENOENT;
}

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

static ssize_t
store_fc_private_host_dev_loss_tmo(struct device *dev,
				   struct device_attribute *attr,
				   const char *buf, size_t count)
{
	struct Scsi_Host *shost = transport_class_to_shost(dev);
	struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
	struct fc_rport *rport;
	unsigned long val, flags;
	int rc;

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

	fc_host_dev_loss_tmo(shost) = val;
	spin_lock_irqsave(shost->host_lock, flags);
	list_for_each_entry(rport, &fc_host->rports, peers)
		fc_rport_set_dev_loss_tmo(rport, val);
	spin_unlock_irqrestore(shost->host_lock, flags);
	return count;
}

fc_private_host_show_function(dev_loss_tmo, "%d\n", 20, );
static FC_DEVICE_ATTR(host, dev_loss_tmo, S_IRUGO | S_IWUSR,
		      show_fc_host_dev_loss_tmo,
		      store_fc_private_host_dev_loss_tmo);

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

/*
 * Host Statistics Management
 */

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

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

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


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

fc_host_statistic(seconds_since_last_reset);
fc_host_statistic(tx_frames);
fc_host_statistic(tx_words);
fc_host_statistic(rx_frames);
fc_host_statistic(rx_words);
fc_host_statistic(lip_count);
fc_host_statistic(nos_count);
fc_host_statistic(error_frames);
fc_host_statistic(dumped_frames);
fc_host_statistic(link_failure_count);
fc_host_statistic(loss_of_sync_count);
fc_host_statistic(loss_of_signal_count);
fc_host_statistic(prim_seq_protocol_err_count);
fc_host_statistic(invalid_tx_word_count);
fc_host_statistic(invalid_crc_count);
fc_host_statistic(fcp_input_requests);
fc_host_statistic(fcp_output_requests);
fc_host_statistic(fcp_control_requests);
fc_host_statistic(fcp_input_megabytes);
fc_host_statistic(fcp_output_megabytes);
fc_host_statistic(fcp_packet_alloc_failures);
fc_host_statistic(fcp_packet_aborts);
fc_host_statistic(fcp_frame_alloc_failures);
fc_host_statistic(fc_no_free_exch);
fc_host_statistic(fc_no_free_exch_xid);
fc_host_statistic(fc_xid_not_found);
fc_host_statistic(fc_xid_busy);
fc_host_statistic(fc_seq_not_found);
fc_host_statistic(fc_non_bls_resp);
fc_host_statistic(cn_sig_warn);
fc_host_statistic(cn_sig_alarm);


#define fc_host_fpin_statistic(name)					\
static ssize_t fc_host_fpinstat_##name(struct device *cd,		\
				  struct device_attribute *attr,	\
				  char *buf)				\
{									\
	struct Scsi_Host *shost = transport_class_to_shost(cd);		\
	struct fc_host_attrs *fc_host = shost_to_fc_host(shost);	\
									\
	return snprintf(buf, 20, "0x%llx\n", fc_host->fpin_stats.name);	\
}									\
static FC_DEVICE_ATTR(host, fpin_##name, 0444, fc_host_fpinstat_##name, NULL)

fc_host_fpin_statistic(dn);
fc_host_fpin_statistic(dn_unknown);
fc_host_fpin_statistic(dn_timeout);
fc_host_fpin_statistic(dn_unable_to_route);
fc_host_fpin_statistic(dn_device_specific);
fc_host_fpin_statistic(cn);
fc_host_fpin_statistic(cn_clear);
fc_host_fpin_statistic(cn_lost_credit);
fc_host_fpin_statistic(cn_credit_stall);
fc_host_fpin_statistic(cn_oversubscription);
fc_host_fpin_statistic(cn_device_specific);
fc_host_fpin_statistic(li);
fc_host_fpin_statistic(li_failure_unknown);
fc_host_fpin_statistic(li_link_failure_count);
fc_host_fpin_statistic(li_loss_of_sync_count);
fc_host_fpin_statistic(li_loss_of_signals_count);
fc_host_fpin_statistic(li_prim_seq_err_count);
fc_host_fpin_statistic(li_invalid_tx_word_count);
fc_host_fpin_statistic(li_invalid_crc_count);
fc_host_fpin_statistic(li_device_specific);

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

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

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

static struct attribute *fc_statistics_attrs[] = {
	&device_attr_host_seconds_since_last_reset.attr,
	&device_attr_host_tx_frames.attr,
	&device_attr_host_tx_words.attr,
	&device_attr_host_rx_frames.attr,
	&device_attr_host_rx_words.attr,
	&device_attr_host_lip_count.attr,
	&device_attr_host_nos_count.attr,
	&device_attr_host_error_frames.attr,
	&device_attr_host_dumped_frames.attr,
	&device_attr_host_link_failure_count.attr,
	&device_attr_host_loss_of_sync_count.attr,
	&device_attr_host_loss_of_signal_count.attr,
	&device_attr_host_prim_seq_protocol_err_count.attr,
	&device_attr_host_invalid_tx_word_count.attr,
	&device_attr_host_invalid_crc_count.attr,
	&device_attr_host_fcp_input_requests.attr,
	&device_attr_host_fcp_output_requests.attr,
	&device_attr_host_fcp_control_requests.attr,
	&device_attr_host_fcp_input_megabytes.attr,
	&device_attr_host_fcp_output_megabytes.attr,
	&device_attr_host_fcp_packet_alloc_failures.attr,
	&device_attr_host_fcp_packet_aborts.attr,
	&device_attr_host_fcp_frame_alloc_failures.attr,
	&device_attr_host_fc_no_free_exch.attr,
	&device_attr_host_fc_no_free_exch_xid.attr,
	&device_attr_host_fc_xid_not_found.attr,
	&device_attr_host_fc_xid_busy.attr,
	&device_attr_host_fc_seq_not_found.attr,
	&device_attr_host_fc_non_bls_resp.attr,
	&device_attr_host_cn_sig_warn.attr,
	&device_attr_host_cn_sig_alarm.attr,
	&device_attr_host_reset_statistics.attr,
	&device_attr_host_fpin_dn.attr,
	&device_attr_host_fpin_dn_unknown.attr,
	&device_attr_host_fpin_dn_timeout.attr,
	&device_attr_host_fpin_dn_unable_to_route.attr,
	&device_attr_host_fpin_dn_device_specific.attr,
	&device_attr_host_fpin_li.attr,
	&device_attr_host_fpin_li_failure_unknown.attr,
	&device_attr_host_fpin_li_link_failure_count.attr,
	&device_attr_host_fpin_li_loss_of_sync_count.attr,
	&device_attr_host_fpin_li_loss_of_signals_count.attr,
	&device_attr_host_fpin_li_prim_seq_err_count.attr,
	&device_attr_host_fpin_li_invalid_tx_word_count.attr,
	&device_attr_host_fpin_li_invalid_crc_count.attr,
	&device_attr_host_fpin_li_device_specific.attr,
	&device_attr_host_fpin_cn.attr,
	&device_attr_host_fpin_cn_clear.attr,
	&device_attr_host_fpin_cn_lost_credit.attr,
	&device_attr_host_fpin_cn_credit_stall.attr,
	&device_attr_host_fpin_cn_oversubscription.attr,
	&device_attr_host_fpin_cn_device_specific.attr,
	NULL
};

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


/* Host Vport Attributes */

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

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

	/* Validate and store the new name */
	for (i=0, j=0; i < 16; i++) {
		int value;

		value = hex_to_bin(*ns++);
		if (value >= 0)
			j = (j << 4) | value;
		else
			return -EINVAL;
		if (i % 2) {
			wwn[i/2] = j & 0xff;
			j = 0;
		}
	}

	*nm = wwn_to_u64(wwn);

	return 0;
}


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

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

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

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

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

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

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

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


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

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

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

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

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

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

	if (!match)
		return -ENODEV;

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


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

	if (!scsi_is_host_device(dev))
		return 0;

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

	i = to_fc_internal(shost->transportt);

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

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

	if (!scsi_is_target_device(dev))
		return 0;

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

	i = to_fc_internal(shost->transportt);

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

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

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

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

	if (!scsi_is_fc_rport(dev))
		return 0;

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

	i = to_fc_internal(shost->transportt);

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


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

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

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

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

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

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


/**
 * fc_eh_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.
 */
enum scsi_timeout_action fc_eh_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 SCSI_EH_RESET_TIMER;

	return SCSI_EH_NOT_HANDLED;
}
EXPORT_SYMBOL(fc_eh_timed_out);

/*
 * Called by fc_user_scan to locate an rport on the shost that
 * matches the channel and target id, and invoke scsi_scan_target()
 * on the rport.
 */
static void
fc_user_scan_tgt(struct Scsi_Host *shost, uint channel, uint id, u64 lun)
{
	struct fc_rport *rport;
	unsigned long flags;

	spin_lock_irqsave(shost->host_lock, flags);

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

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

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

	spin_unlock_irqrestore(shost->host_lock, flags);
}

/*
 * Called via sysfs scan routines. Necessary, as the FC transport
 * wants to place all target objects below the rport object. So this
 * routine must invoke the scsi_scan_target() routine with the rport
 * object as the parent.
 */
static int
fc_user_scan(struct Scsi_Host *shost, uint channel, uint id, u64 lun)
{
	uint chlo, chhi;
	uint tgtlo, tgthi;

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

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

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

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

	return 0;
}

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

	if (unlikely(!i))
		return NULL;

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

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

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

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

	i->f = ft;

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

	i->t.user_scan = fc_user_scan;

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

	BUG_ON(count > FC_STARGET_NUM_ATTRS);

	i->starget_attrs[count] = NULL;


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

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

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

	BUG_ON(count > FC_HOST_NUM_ATTRS);

	i->host_attrs[count] = NULL;

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

	BUG_ON(count > FC_RPORT_NUM_ATTRS);

	i->rport_attrs[count] = NULL;

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

	BUG_ON(count > FC_VPORT_NUM_ATTRS);

	i->vport_attrs[count] = NULL;

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

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

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

	kfree(i);
}
EXPORT_SYMBOL(fc_release_transport);

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

		return -EINVAL;
	}

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

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

	flush_workqueue(fc_host_work_q(shost));
}

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

		return -EINVAL;
	}

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

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

	flush_workqueue(fc_host_devloss_work_q(shost));
}


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

	spin_lock_irqsave(shost->host_lock, flags);

	/* Remove any vports */
	list_for_each_entry_safe(vport, next_vport, &fc_host->vports, peers) {
		vport->flags |= FC_VPORT_DELETING;
		fc_queue_work(shost, &vport->vport_delete_work);
	}

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

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

	spin_unlock_irqrestore(shost->host_lock, flags);

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

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

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

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

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

	/*
	 * Must unblock to flush queued IO. scsi-ml will fail incoming reqs.
	 */
	scsi_target_unblock(&rport->dev, SDEV_TRANSPORT_OFFLINE);
}

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

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


/**
 * fc_rport_final_delete - finish rport termination and delete it.
 * @work:	remote port to be deleted.
 */
static void
fc_rport_final_delete(struct work_struct *work)
{
	struct fc_rport *rport =
		container_of(work, struct fc_rport, rport_delete_work);
	struct device *dev = &rport->dev;
	struct Scsi_Host *shost = rport_to_shost(rport);
	struct fc_internal *i = to_fc_internal(shost->transportt);
	unsigned long flags;
	int do_callback = 0;

	fc_terminate_rport_io(rport);

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

	/*
	 * Cancel any outstanding timers. These should really exist
	 * only when rmmod'ing the LLDD and we're asking for