// SPDX-License-Identifier: GPL-2.0+
/*
 *  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(struct fc_fn_li_desc *li_desc,
                               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_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;
        u32 len;
        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) + 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, data_buf, data_len);

        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(struct fc_fn_li_desc *li_desc,
                   struct fc_fpin_stats *stats)
{
        stats->li += be32_to_cpu(li_desc->event_count);
        switch (be16_to_cpu(li_desc->event_type)) {
        case FPIN_LI_UNKNOWN:
                stats->li_failure_unknown +=
                    be32_to_cpu(li_desc->event_count);
                break;
        case FPIN_LI_LINK_FAILURE:
                stats->li_link_failure_count +=
                    be32_to_cpu(li_desc->event_count);
                break;
        case FPIN_LI_LOSS_OF_SYNC:
                stats->li_loss_of_sync_count +=
                    be32_to_cpu(li_desc->event_count);
                break;
        case FPIN_LI_LOSS_OF_SIG:
                stats->li_loss_of_signals_count +=
                    be32_to_cpu(li_desc->event_count);
                break;
        case FPIN_LI_PRIM_SEQ_ERR:
                stats->li_prim_seq_err_count +=
                    be32_to_cpu(li_desc->event_count);
                break;
        case FPIN_LI_INVALID_TX_WD:
                stats->li_invalid_tx_word_count +=
                    be32_to_cpu(li_desc->event_count);
                break;
        case FPIN_LI_INVALID_CRC:
                stats->li_invalid_crc_count +=
                    be32_to_cpu(li_desc->event_count);
                break;
        case FPIN_LI_DEVICE_SPEC:
                stats->li_device_specific +=
                    be32_to_cpu(li_desc->event_count);
                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;
        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(li_desc, &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(li_desc,
                                                   &rport->fpin_stats);
                        }
                }
        }

        if (fc_host->port_name == be64_to_cpu(li_desc->attached_wwpn))
                fc_li_stats_update(li_desc, &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_rcv_fpin - 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
 *
 * 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)
{
        struct fc_els_fpin *fpin = (struct fc_els_fpin *)fpin_buf;
        struct fc_tlv_desc *tlv;
        u32 desc_cnt = 0, bytes_remain;
        u32 dtag;

        /* 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);
                }

                desc_cnt++;
                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(),
                                FCH_EVT_LINK_FPIN, 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, "%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;
        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 | FC_VPORT_DELETING)) {
                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 blk_eh_timer_return
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 BLK_EH_RESET_TIMER;

        return BLK_EH_DONE;
}
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
         * immediate termination of the rports
         */
        spin_lock_irqsave(shost->host_lock, flags);
        if (rport->flags & FC_RPORT_DEVLOSS_PENDING) {
                spin_unlock_irqrestore(shost->host_lock, flags);
                if (!cancel_delayed_work(&rport->fail_io_work))
                        fc_flush_devloss(shost);