drivers/scsi/scsi_transport_fc.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  FiberChannel transport specific attributes exported to sysfs.
   4  *
   5  *  Copyright (c) 2003 Silicon Graphics, Inc.  All rights reserved.
   6  *  Copyright (C) 2004-2007   James Smart, Emulex Corporation
   7  *    Rewrite for host, target, device, and remote port attributes,
   8  *    statistics, and service functions...
   9  *    Add vports, etc
  10  */
  11 #include <linux/module.h>
  12 #include <linux/init.h>
  13 #include <linux/slab.h>
  14 #include <linux/delay.h>
  15 #include <linux/kernel.h>
  16 #include <linux/bsg-lib.h>
  17 #include <scsi/scsi_device.h>
  18 #include <scsi/scsi_host.h>
  19 #include <scsi/scsi_transport.h>
  20 #include <scsi/scsi_transport_fc.h>
  21 #include <scsi/scsi_cmnd.h>
  22 #include <net/netlink.h>
  23 #include <scsi/scsi_netlink_fc.h>
  24 #include <scsi/scsi_bsg_fc.h>
  25 #include <uapi/scsi/fc/fc_els.h>
  26 #include "scsi_priv.h"
  27
  28 static int fc_queue_work(struct Scsi_Host *, struct work_struct *);
  29 static void fc_vport_sched_delete(struct work_struct *work);
  30 static int fc_vport_setup(struct Scsi_Host *shost, int channel,
  31         struct device *pdev, struct fc_vport_identifiers  *ids,
  32         struct fc_vport **vport);
  33 static int fc_bsg_hostadd(struct Scsi_Host *, struct fc_host_attrs *);
  34 static int fc_bsg_rportadd(struct Scsi_Host *, struct fc_rport *);
  35 static void fc_bsg_remove(struct request_queue *);
  36 static void fc_bsg_goose_queue(struct fc_rport *);
  37 static void fc_li_stats_update(struct fc_fn_li_desc *li_desc,
  38                                struct fc_fpin_stats *stats);
  39 static void fc_delivery_stats_update(u32 reason_code,
  40                                      struct fc_fpin_stats *stats);
  41 static void fc_cn_stats_update(u16 event_type, struct fc_fpin_stats *stats);
  42
  43 /*
  44  * Module Parameters
  45  */
  46
  47 /*
  48  * dev_loss_tmo: the default number of seconds that the FC transport
  49  *   should insulate the loss of a remote port.
  50  *   The maximum will be capped by the value of SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
  51  */
  52 static unsigned int fc_dev_loss_tmo = 60;               /* seconds */
  53
  54 module_param_named(dev_loss_tmo, fc_dev_loss_tmo, uint, S_IRUGO|S_IWUSR);
  55 MODULE_PARM_DESC(dev_loss_tmo,
  56                  "Maximum number of seconds that the FC transport should"
  57                  " insulate the loss of a remote port. Once this value is"
  58                  " exceeded, the scsi target is removed. Value should be"
  59                  " between 1 and SCSI_DEVICE_BLOCK_MAX_TIMEOUT if"
  60                  " fast_io_fail_tmo is not set.");
  61
  62 /*
  63  * Redefine so that we can have same named attributes in the
  64  * sdev/starget/host objects.
  65  */
  66 #define FC_DEVICE_ATTR(_prefix,_name,_mode,_show,_store)                \
  67 struct device_attribute device_attr_##_prefix##_##_name =       \
  68         __ATTR(_name,_mode,_show,_store)
  69
  70 #define fc_enum_name_search(title, table_type, table)                   \
  71 static const char *get_fc_##title##_name(enum table_type table_key)     \
  72 {                                                                       \
  73         int i;                                                          \
  74         char *name = NULL;                                              \
  75                                                                         \
  76         for (i = 0; i < ARRAY_SIZE(table); i++) {                       \
  77                 if (table[i].value == table_key) {                      \
  78                         name = table[i].name;                           \
  79                         break;                                          \
  80                 }                                                       \
  81         }                                                               \
  82         return name;                                                    \
  83 }
  84
  85 #define fc_enum_name_match(title, table_type, table)                    \
  86 static int get_fc_##title##_match(const char *table_key,                \
  87                 enum table_type *value)                                 \
  88 {                                                                       \
  89         int i;                                                          \
  90                                                                         \
  91         for (i = 0; i < ARRAY_SIZE(table); i++) {                       \
  92                 if (strncmp(table_key, table[i].name,                   \
  93                                 table[i].matchlen) == 0) {              \
  94                         *value = table[i].value;                        \
  95                         return 0; /* success */                         \
  96                 }                                                       \
  97         }                                                               \
  98         return 1; /* failure */                                         \
  99 }
 100
 101
 102 /* Convert fc_port_type values to ascii string name */
 103 static struct {
 104         enum fc_port_type       value;
 105         char                    *name;
 106 } fc_port_type_names[] = {
 107         { FC_PORTTYPE_UNKNOWN,          "Unknown" },
 108         { FC_PORTTYPE_OTHER,            "Other" },
 109         { FC_PORTTYPE_NOTPRESENT,       "Not Present" },
 110         { FC_PORTTYPE_NPORT,    "NPort (fabric via point-to-point)" },
 111         { FC_PORTTYPE_NLPORT,   "NLPort (fabric via loop)" },
 112         { FC_PORTTYPE_LPORT,    "LPort (private loop)" },
 113         { FC_PORTTYPE_PTP,      "Point-To-Point (direct nport connection)" },
 114         { FC_PORTTYPE_NPIV,             "NPIV VPORT" },
 115 };
 116 fc_enum_name_search(port_type, fc_port_type, fc_port_type_names)
 117 #define FC_PORTTYPE_MAX_NAMELEN         50
 118
 119 /* Reuse fc_port_type enum function for vport_type */
 120 #define get_fc_vport_type_name get_fc_port_type_name
 121
 122
 123 /* Convert fc_host_event_code values to ascii string name */
 124 static const struct {
 125         enum fc_host_event_code         value;
 126         char                            *name;
 127 } fc_host_event_code_names[] = {
 128         { FCH_EVT_LIP,                  "lip" },
 129         { FCH_EVT_LINKUP,               "link_up" },
 130         { FCH_EVT_LINKDOWN,             "link_down" },
 131         { FCH_EVT_LIPRESET,             "lip_reset" },
 132         { FCH_EVT_RSCN,                 "rscn" },
 133         { FCH_EVT_ADAPTER_CHANGE,       "adapter_chg" },
 134         { FCH_EVT_PORT_UNKNOWN,         "port_unknown" },
 135         { FCH_EVT_PORT_ONLINE,          "port_online" },
 136         { FCH_EVT_PORT_OFFLINE,         "port_offline" },
 137         { FCH_EVT_PORT_FABRIC,          "port_fabric" },
 138         { FCH_EVT_LINK_UNKNOWN,         "link_unknown" },
 139         { FCH_EVT_LINK_FPIN,            "link_FPIN" },
 140         { FCH_EVT_VENDOR_UNIQUE,        "vendor_unique" },
 141 };
 142 fc_enum_name_search(host_event_code, fc_host_event_code,
 143                 fc_host_event_code_names)
 144 #define FC_HOST_EVENT_CODE_MAX_NAMELEN  30
 145
 146
 147 /* Convert fc_port_state values to ascii string name */
 148 static struct {
 149         enum fc_port_state      value;
 150         char                    *name;
 151 } fc_port_state_names[] = {
 152         { FC_PORTSTATE_UNKNOWN,         "Unknown" },
 153         { FC_PORTSTATE_NOTPRESENT,      "Not Present" },
 154         { FC_PORTSTATE_ONLINE,          "Online" },
 155         { FC_PORTSTATE_OFFLINE,         "Offline" },
 156         { FC_PORTSTATE_BLOCKED,         "Blocked" },
 157         { FC_PORTSTATE_BYPASSED,        "Bypassed" },
 158         { FC_PORTSTATE_DIAGNOSTICS,     "Diagnostics" },
 159         { FC_PORTSTATE_LINKDOWN,        "Linkdown" },
 160         { FC_PORTSTATE_ERROR,           "Error" },
 161         { FC_PORTSTATE_LOOPBACK,        "Loopback" },
 162         { FC_PORTSTATE_DELETED,         "Deleted" },
 163 };
 164 fc_enum_name_search(port_state, fc_port_state, fc_port_state_names)
 165 #define FC_PORTSTATE_MAX_NAMELEN        20
 166
 167
 168 /* Convert fc_vport_state values to ascii string name */
 169 static struct {
 170         enum fc_vport_state     value;
 171         char                    *name;
 172 } fc_vport_state_names[] = {
 173         { FC_VPORT_UNKNOWN,             "Unknown" },
 174         { FC_VPORT_ACTIVE,              "Active" },
 175         { FC_VPORT_DISABLED,            "Disabled" },
 176         { FC_VPORT_LINKDOWN,            "Linkdown" },
 177         { FC_VPORT_INITIALIZING,        "Initializing" },
 178         { FC_VPORT_NO_FABRIC_SUPP,      "No Fabric Support" },
 179         { FC_VPORT_NO_FABRIC_RSCS,      "No Fabric Resources" },
 180         { FC_VPORT_FABRIC_LOGOUT,       "Fabric Logout" },
 181         { FC_VPORT_FABRIC_REJ_WWN,      "Fabric Rejected WWN" },
 182         { FC_VPORT_FAILED,              "VPort Failed" },
 183 };
 184 fc_enum_name_search(vport_state, fc_vport_state, fc_vport_state_names)
 185 #define FC_VPORTSTATE_MAX_NAMELEN       24
 186
 187 /* Reuse fc_vport_state enum function for vport_last_state */
 188 #define get_fc_vport_last_state_name get_fc_vport_state_name
 189
 190
 191 /* Convert fc_tgtid_binding_type values to ascii string name */
 192 static const struct {
 193         enum fc_tgtid_binding_type      value;
 194         char                            *name;
 195         int                             matchlen;
 196 } fc_tgtid_binding_type_names[] = {
 197         { FC_TGTID_BIND_NONE, "none", 4 },
 198         { FC_TGTID_BIND_BY_WWPN, "wwpn (World Wide Port Name)", 4 },
 199         { FC_TGTID_BIND_BY_WWNN, "wwnn (World Wide Node Name)", 4 },
 200         { FC_TGTID_BIND_BY_ID, "port_id (FC Address)", 7 },
 201 };
 202 fc_enum_name_search(tgtid_bind_type, fc_tgtid_binding_type,
 203                 fc_tgtid_binding_type_names)
 204 fc_enum_name_match(tgtid_bind_type, fc_tgtid_binding_type,
 205                 fc_tgtid_binding_type_names)
 206 #define FC_BINDTYPE_MAX_NAMELEN 30
 207
 208
 209 #define fc_bitfield_name_search(title, table)                   \
 210 static ssize_t                                                  \
 211 get_fc_##title##_names(u32 table_key, char *buf)                \
 212 {                                                               \
 213         char *prefix = "";                                      \
 214         ssize_t len = 0;                                        \
 215         int i;                                                  \
 216                                                                 \
 217         for (i = 0; i < ARRAY_SIZE(table); i++) {               \
 218                 if (table[i].value & table_key) {               \
 219                         len += sprintf(buf + len, "%s%s",       \
 220                                 prefix, table[i].name);         \
 221                         prefix = ", ";                          \
 222                 }                                               \
 223         }                                                       \
 224         len += sprintf(buf + len, "\n");                        \
 225         return len;                                             \
 226 }
 227
 228
 229 /* Convert FC_COS bit values to ascii string name */
 230 static const struct {
 231         u32                     value;
 232         char                    *name;
 233 } fc_cos_names[] = {
 234         { FC_COS_CLASS1,        "Class 1" },
 235         { FC_COS_CLASS2,        "Class 2" },
 236         { FC_COS_CLASS3,        "Class 3" },
 237         { FC_COS_CLASS4,        "Class 4" },
 238         { FC_COS_CLASS6,        "Class 6" },
 239 };
 240 fc_bitfield_name_search(cos, fc_cos_names)
 241
 242
 243 /* Convert FC_PORTSPEED bit values to ascii string name */
 244 static const struct {
 245         u32                     value;
 246         char                    *name;
 247 } fc_port_speed_names[] = {
 248         { FC_PORTSPEED_1GBIT,           "1 Gbit" },
 249         { FC_PORTSPEED_2GBIT,           "2 Gbit" },
 250         { FC_PORTSPEED_4GBIT,           "4 Gbit" },
 251         { FC_PORTSPEED_10GBIT,          "10 Gbit" },
 252         { FC_PORTSPEED_8GBIT,           "8 Gbit" },
 253         { FC_PORTSPEED_16GBIT,          "16 Gbit" },
 254         { FC_PORTSPEED_32GBIT,          "32 Gbit" },
 255         { FC_PORTSPEED_20GBIT,          "20 Gbit" },
 256         { FC_PORTSPEED_40GBIT,          "40 Gbit" },
 257         { FC_PORTSPEED_50GBIT,          "50 Gbit" },
 258         { FC_PORTSPEED_100GBIT,         "100 Gbit" },
 259         { FC_PORTSPEED_25GBIT,          "25 Gbit" },
 260         { FC_PORTSPEED_64GBIT,          "64 Gbit" },
 261         { FC_PORTSPEED_128GBIT,         "128 Gbit" },
 262         { FC_PORTSPEED_256GBIT,         "256 Gbit" },
 263         { FC_PORTSPEED_NOT_NEGOTIATED,  "Not Negotiated" },
 264 };
 265 fc_bitfield_name_search(port_speed, fc_port_speed_names)
 266
 267
 268 static int
 269 show_fc_fc4s (char *buf, u8 *fc4_list)
 270 {
 271         int i, len=0;
 272
 273         for (i = 0; i < FC_FC4_LIST_SIZE; i++, fc4_list++)
 274                 len += sprintf(buf + len , "0x%02x ", *fc4_list);
 275         len += sprintf(buf + len, "\n");
 276         return len;
 277 }
 278
 279
 280 /* Convert FC_PORT_ROLE bit values to ascii string name */
 281 static const struct {
 282         u32                     value;
 283         char                    *name;
 284 } fc_port_role_names[] = {
 285         { FC_PORT_ROLE_FCP_TARGET,              "FCP Target" },
 286         { FC_PORT_ROLE_FCP_INITIATOR,           "FCP Initiator" },
 287         { FC_PORT_ROLE_IP_PORT,                 "IP Port" },
 288         { FC_PORT_ROLE_FCP_DUMMY_INITIATOR,     "FCP Dummy Initiator" },
 289         { FC_PORT_ROLE_NVME_INITIATOR,          "NVMe Initiator" },
 290         { FC_PORT_ROLE_NVME_TARGET,             "NVMe Target" },
 291         { FC_PORT_ROLE_NVME_DISCOVERY,          "NVMe Discovery" },
 292 };
 293 fc_bitfield_name_search(port_roles, fc_port_role_names)
 294
 295 /*
 296  * Define roles that are specific to port_id. Values are relative to ROLE_MASK.
 297  */
 298 #define FC_WELLKNOWN_PORTID_MASK        0xfffff0
 299 #define FC_WELLKNOWN_ROLE_MASK          0x00000f
 300 #define FC_FPORT_PORTID                 0x00000e
 301 #define FC_FABCTLR_PORTID               0x00000d
 302 #define FC_DIRSRVR_PORTID               0x00000c
 303 #define FC_TIMESRVR_PORTID              0x00000b
 304 #define FC_MGMTSRVR_PORTID              0x00000a
 305
 306
 307 static void fc_timeout_deleted_rport(struct work_struct *work);
 308 static void fc_timeout_fail_rport_io(struct work_struct *work);
 309 static void fc_scsi_scan_rport(struct work_struct *work);
 310
 311 /*
 312  * Attribute counts pre object type...
 313  * Increase these values if you add attributes
 314  */
 315 #define FC_STARGET_NUM_ATTRS    3
 316 #define FC_RPORT_NUM_ATTRS      10
 317 #define FC_VPORT_NUM_ATTRS      9
 318 #define FC_HOST_NUM_ATTRS       29
 319
 320 struct fc_internal {
 321         struct scsi_transport_template t;
 322         struct fc_function_template *f;
 323
 324         /*
 325          * For attributes : each object has :
 326          *   An array of the actual attributes structures
 327          *   An array of null-terminated pointers to the attribute
 328          *     structures - used for mid-layer interaction.
 329          *
 330          * The attribute containers for the starget and host are are
 331          * part of the midlayer. As the remote port is specific to the
 332          * fc transport, we must provide the attribute container.
 333          */
 334         struct device_attribute private_starget_attrs[
 335                                                         FC_STARGET_NUM_ATTRS];
 336         struct device_attribute *starget_attrs[FC_STARGET_NUM_ATTRS + 1];
 337
 338         struct device_attribute private_host_attrs[FC_HOST_NUM_ATTRS];
 339         struct device_attribute *host_attrs[FC_HOST_NUM_ATTRS + 1];
 340
 341         struct transport_container rport_attr_cont;
 342         struct device_attribute private_rport_attrs[FC_RPORT_NUM_ATTRS];
 343         struct device_attribute *rport_attrs[FC_RPORT_NUM_ATTRS + 1];
 344
 345         struct transport_container vport_attr_cont;
 346         struct device_attribute private_vport_attrs[FC_VPORT_NUM_ATTRS];
 347         struct device_attribute *vport_attrs[FC_VPORT_NUM_ATTRS + 1];
 348 };
 349
 350 #define to_fc_internal(tmpl)    container_of(tmpl, struct fc_internal, t)
 351
 352 static int fc_target_setup(struct transport_container *tc, struct device *dev,
 353                            struct device *cdev)
 354 {
 355         struct scsi_target *starget = to_scsi_target(dev);
 356         struct fc_rport *rport = starget_to_rport(starget);
 357
 358         /*
 359          * if parent is remote port, use values from remote port.
 360          * Otherwise, this host uses the fc_transport, but not the
 361          * remote port interface. As such, initialize to known non-values.
 362          */
 363         if (rport) {
 364                 fc_starget_node_name(starget) = rport->node_name;
 365                 fc_starget_port_name(starget) = rport->port_name;
 366                 fc_starget_port_id(starget) = rport->port_id;
 367         } else {
 368                 fc_starget_node_name(starget) = -1;
 369                 fc_starget_port_name(starget) = -1;
 370                 fc_starget_port_id(starget) = -1;
 371         }
 372
 373         return 0;
 374 }
 375
 376 static DECLARE_TRANSPORT_CLASS(fc_transport_class,
 377                                "fc_transport",
 378                                fc_target_setup,
 379                                NULL,
 380                                NULL);
 381
 382 static int fc_host_setup(struct transport_container *tc, struct device *dev,
 383                          struct device *cdev)
 384 {
 385         struct Scsi_Host *shost = dev_to_shost(dev);
 386         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
 387
 388         /*
 389          * Set default values easily detected by the midlayer as
 390          * failure cases.  The scsi lldd is responsible for initializing
 391          * all transport attributes to valid values per host.
 392          */
 393         fc_host->node_name = -1;
 394         fc_host->port_name = -1;
 395         fc_host->permanent_port_name = -1;
 396         fc_host->supported_classes = FC_COS_UNSPECIFIED;
 397         memset(fc_host->supported_fc4s, 0,
 398                 sizeof(fc_host->supported_fc4s));
 399         fc_host->supported_speeds = FC_PORTSPEED_UNKNOWN;
 400         fc_host->maxframe_size = -1;
 401         fc_host->max_npiv_vports = 0;
 402         memset(fc_host->serial_number, 0,
 403                 sizeof(fc_host->serial_number));
 404         memset(fc_host->manufacturer, 0,
 405                 sizeof(fc_host->manufacturer));
 406         memset(fc_host->model, 0,
 407                 sizeof(fc_host->model));
 408         memset(fc_host->model_description, 0,
 409                 sizeof(fc_host->model_description));
 410         memset(fc_host->hardware_version, 0,
 411                 sizeof(fc_host->hardware_version));
 412         memset(fc_host->driver_version, 0,
 413                 sizeof(fc_host->driver_version));
 414         memset(fc_host->firmware_version, 0,
 415                 sizeof(fc_host->firmware_version));
 416         memset(fc_host->optionrom_version, 0,
 417                 sizeof(fc_host->optionrom_version));
 418
 419         fc_host->port_id = -1;
 420         fc_host->port_type = FC_PORTTYPE_UNKNOWN;
 421         fc_host->port_state = FC_PORTSTATE_UNKNOWN;
 422         memset(fc_host->active_fc4s, 0,
 423                 sizeof(fc_host->active_fc4s));
 424         fc_host->speed = FC_PORTSPEED_UNKNOWN;
 425         fc_host->fabric_name = -1;
 426         memset(fc_host->symbolic_name, 0, sizeof(fc_host->symbolic_name));
 427         memset(fc_host->system_hostname, 0, sizeof(fc_host->system_hostname));
 428         memset(&fc_host->fpin_stats, 0, sizeof(fc_host->fpin_stats));
 429
 430         fc_host->tgtid_bind_type = FC_TGTID_BIND_BY_WWPN;
 431
 432         INIT_LIST_HEAD(&fc_host->rports);
 433         INIT_LIST_HEAD(&fc_host->rport_bindings);
 434         INIT_LIST_HEAD(&fc_host->vports);
 435         fc_host->next_rport_number = 0;
 436         fc_host->next_target_id = 0;
 437         fc_host->next_vport_number = 0;
 438         fc_host->npiv_vports_inuse = 0;
 439
 440         snprintf(fc_host->work_q_name, sizeof(fc_host->work_q_name),
 441                  "fc_wq_%d", shost->host_no);
 442         fc_host->work_q = alloc_workqueue("%s", 0, 0, fc_host->work_q_name);
 443         if (!fc_host->work_q)
 444                 return -ENOMEM;
 445
 446         fc_host->dev_loss_tmo = fc_dev_loss_tmo;
 447         snprintf(fc_host->devloss_work_q_name,
 448                  sizeof(fc_host->devloss_work_q_name),
 449                  "fc_dl_%d", shost->host_no);
 450         fc_host->devloss_work_q = alloc_workqueue("%s", 0, 0,
 451                                         fc_host->devloss_work_q_name);
 452         if (!fc_host->devloss_work_q) {
 453                 destroy_workqueue(fc_host->work_q);
 454                 fc_host->work_q = NULL;
 455                 return -ENOMEM;
 456         }
 457
 458         fc_bsg_hostadd(shost, fc_host);
 459         /* ignore any bsg add error - we just can't do sgio */
 460
 461         return 0;
 462 }
 463
 464 static int fc_host_remove(struct transport_container *tc, struct device *dev,
 465                          struct device *cdev)
 466 {
 467         struct Scsi_Host *shost = dev_to_shost(dev);
 468         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
 469
 470         fc_bsg_remove(fc_host->rqst_q);
 471         return 0;
 472 }
 473
 474 static DECLARE_TRANSPORT_CLASS(fc_host_class,
 475                                "fc_host",
 476                                fc_host_setup,
 477                                fc_host_remove,
 478                                NULL);
 479
 480 /*
 481  * Setup and Remove actions for remote ports are handled
 482  * in the service functions below.
 483  */
 484 static DECLARE_TRANSPORT_CLASS(fc_rport_class,
 485                                "fc_remote_ports",
 486                                NULL,
 487                                NULL,
 488                                NULL);
 489
 490 /*
 491  * Setup and Remove actions for virtual ports are handled
 492  * in the service functions below.
 493  */
 494 static DECLARE_TRANSPORT_CLASS(fc_vport_class,
 495                                "fc_vports",
 496                                NULL,
 497                                NULL,
 498                                NULL);
 499
 500 /*
 501  * Netlink Infrastructure
 502  */
 503
 504 static atomic_t fc_event_seq;
 505
 506 /**
 507  * fc_get_event_number - Obtain the next sequential FC event number
 508  *
 509  * Notes:
 510  *   We could have inlined this, but it would have required fc_event_seq to
 511  *   be exposed. For now, live with the subroutine call.
 512  *   Atomic used to avoid lock/unlock...
 513  */
 514 u32
 515 fc_get_event_number(void)
 516 {
 517         return atomic_add_return(1, &fc_event_seq);
 518 }
 519 EXPORT_SYMBOL(fc_get_event_number);
 520
 521 /**
 522  * fc_host_post_fc_event - routine to do the work of posting an event
 523  *                      on an fc_host.
 524  * @shost:              host the event occurred on
 525  * @event_number:       fc event number obtained from get_fc_event_number()
 526  * @event_code:         fc_host event being posted
 527  * @data_len:           amount, in bytes, of event data
 528  * @data_buf:           pointer to event data
 529  * @vendor_id:          value for Vendor id
 530  *
 531  * Notes:
 532  *      This routine assumes no locks are held on entry.
 533  */
 534 void
 535 fc_host_post_fc_event(struct Scsi_Host *shost, u32 event_number,
 536                 enum fc_host_event_code event_code,
 537                 u32 data_len, char *data_buf, u64 vendor_id)
 538 {
 539         struct sk_buff *skb;
 540         struct nlmsghdr *nlh;
 541         struct fc_nl_event *event;
 542         const char *name;
 543         u32 len;
 544         int err;
 545
 546         if (!data_buf || data_len < 4)
 547                 data_len = 0;
 548
 549         if (!scsi_nl_sock) {
 550                 err = -ENOENT;
 551                 goto send_fail;
 552         }
 553
 554         len = FC_NL_MSGALIGN(sizeof(*event) + data_len);
 555
 556         skb = nlmsg_new(len, GFP_KERNEL);
 557         if (!skb) {
 558                 err = -ENOBUFS;
 559                 goto send_fail;
 560         }
 561
 562         nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG, len, 0);
 563         if (!nlh) {
 564                 err = -ENOBUFS;
 565                 goto send_fail_skb;
 566         }
 567         event = nlmsg_data(nlh);
 568
 569         INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
 570                                 FC_NL_ASYNC_EVENT, len);
 571         event->seconds = ktime_get_real_seconds();
 572         event->vendor_id = vendor_id;
 573         event->host_no = shost->host_no;
 574         event->event_datalen = data_len;        /* bytes */
 575         event->event_num = event_number;
 576         event->event_code = event_code;
 577         if (data_len)
 578                 memcpy(&event->event_data, data_buf, data_len);
 579
 580         nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
 581                         GFP_KERNEL);
 582         return;
 583
 584 send_fail_skb:
 585         kfree_skb(skb);
 586 send_fail:
 587         name = get_fc_host_event_code_name(event_code);
 588         printk(KERN_WARNING
 589                 "%s: Dropped Event : host %d %s data 0x%08x - err %d\n",
 590                 __func__, shost->host_no,
 591                 (name) ? name : "<unknown>",
 592                 (data_len) ? *((u32 *)data_buf) : 0xFFFFFFFF, err);
 593         return;
 594 }
 595 EXPORT_SYMBOL(fc_host_post_fc_event);
 596
 597 /**
 598  * fc_host_post_event - called to post an even on an fc_host.
 599  * @shost:              host the event occurred on
 600  * @event_number:       fc event number obtained from get_fc_event_number()
 601  * @event_code:         fc_host event being posted
 602  * @event_data:         32bits of data for the event being posted
 603  *
 604  * Notes:
 605  *      This routine assumes no locks are held on entry.
 606  */
 607 void
 608 fc_host_post_event(struct Scsi_Host *shost, u32 event_number,
 609                 enum fc_host_event_code event_code, u32 event_data)
 610 {
 611         fc_host_post_fc_event(shost, event_number, event_code,
 612                 (u32)sizeof(u32), (char *)&event_data, 0);
 613 }
 614 EXPORT_SYMBOL(fc_host_post_event);
 615
 616
 617 /**
 618  * fc_host_post_vendor_event - called to post a vendor unique event
 619  *                      on an fc_host
 620  * @shost:              host the event occurred on
 621  * @event_number:       fc event number obtained from get_fc_event_number()
 622  * @data_len:           amount, in bytes, of vendor unique data
 623  * @data_buf:           pointer to vendor unique data
 624  * @vendor_id:          Vendor id
 625  *
 626  * Notes:
 627  *      This routine assumes no locks are held on entry.
 628  */
 629 void
 630 fc_host_post_vendor_event(struct Scsi_Host *shost, u32 event_number,
 631                 u32 data_len, char * data_buf, u64 vendor_id)
 632 {
 633         fc_host_post_fc_event(shost, event_number, FCH_EVT_VENDOR_UNIQUE,
 634                 data_len, data_buf, vendor_id);
 635 }
 636 EXPORT_SYMBOL(fc_host_post_vendor_event);
 637
 638 /**
 639  * fc_find_rport_by_wwpn - find the fc_rport pointer for a given wwpn
 640  * @shost:              host the fc_rport is associated with
 641  * @wwpn:               wwpn of the fc_rport device
 642  *
 643  * Notes:
 644  *      This routine assumes no locks are held on entry.
 645  */
 646 struct fc_rport *
 647 fc_find_rport_by_wwpn(struct Scsi_Host *shost, u64 wwpn)
 648 {
 649         struct fc_rport *rport;
 650         unsigned long flags;
 651
 652         spin_lock_irqsave(shost->host_lock, flags);
 653
 654         list_for_each_entry(rport, &fc_host_rports(shost), peers) {
 655                 if (rport->port_state != FC_PORTSTATE_ONLINE)
 656                         continue;
 657
 658                 if (rport->port_name == wwpn) {
 659                         spin_unlock_irqrestore(shost->host_lock, flags);
 660                         return rport;
 661                 }
 662         }
 663
 664         spin_unlock_irqrestore(shost->host_lock, flags);
 665         return NULL;
 666 }
 667 EXPORT_SYMBOL(fc_find_rport_by_wwpn);
 668
 669 static void
 670 fc_li_stats_update(struct fc_fn_li_desc *li_desc,
 671                    struct fc_fpin_stats *stats)
 672 {
 673         stats->li += be32_to_cpu(li_desc->event_count);
 674         switch (be16_to_cpu(li_desc->event_type)) {
 675         case FPIN_LI_UNKNOWN:
 676                 stats->li_failure_unknown +=
 677                     be32_to_cpu(li_desc->event_count);
 678                 break;
 679         case FPIN_LI_LINK_FAILURE:
 680                 stats->li_link_failure_count +=
 681                     be32_to_cpu(li_desc->event_count);
 682                 break;
 683         case FPIN_LI_LOSS_OF_SYNC:
 684                 stats->li_loss_of_sync_count +=
 685                     be32_to_cpu(li_desc->event_count);
 686                 break;
 687         case FPIN_LI_LOSS_OF_SIG:
 688                 stats->li_loss_of_signals_count +=
 689                     be32_to_cpu(li_desc->event_count);
 690                 break;
 691         case FPIN_LI_PRIM_SEQ_ERR:
 692                 stats->li_prim_seq_err_count +=
 693                     be32_to_cpu(li_desc->event_count);
 694                 break;
 695         case FPIN_LI_INVALID_TX_WD:
 696                 stats->li_invalid_tx_word_count +=
 697                     be32_to_cpu(li_desc->event_count);
 698                 break;
 699         case FPIN_LI_INVALID_CRC:
 700                 stats->li_invalid_crc_count +=
 701                     be32_to_cpu(li_desc->event_count);
 702                 break;
 703         case FPIN_LI_DEVICE_SPEC:
 704                 stats->li_device_specific +=
 705                     be32_to_cpu(li_desc->event_count);
 706                 break;
 707         }
 708 }
 709
 710 static void
 711 fc_delivery_stats_update(u32 reason_code, struct fc_fpin_stats *stats)
 712 {
 713         stats->dn++;
 714         switch (reason_code) {
 715         case FPIN_DELI_UNKNOWN:
 716                 stats->dn_unknown++;
 717                 break;
 718         case FPIN_DELI_TIMEOUT:
 719                 stats->dn_timeout++;
 720                 break;
 721         case FPIN_DELI_UNABLE_TO_ROUTE:
 722                 stats->dn_unable_to_route++;
 723                 break;
 724         case FPIN_DELI_DEVICE_SPEC:
 725                 stats->dn_device_specific++;
 726                 break;
 727         }
 728 }
 729
 730 static void
 731 fc_cn_stats_update(u16 event_type, struct fc_fpin_stats *stats)
 732 {
 733         stats->cn++;
 734         switch (event_type) {
 735         case FPIN_CONGN_CLEAR:
 736                 stats->cn_clear++;
 737                 break;
 738         case FPIN_CONGN_LOST_CREDIT:
 739                 stats->cn_lost_credit++;
 740                 break;
 741         case FPIN_CONGN_CREDIT_STALL:
 742                 stats->cn_credit_stall++;
 743                 break;
 744         case FPIN_CONGN_OVERSUBSCRIPTION:
 745                 stats->cn_oversubscription++;
 746                 break;
 747         case FPIN_CONGN_DEVICE_SPEC:
 748                 stats->cn_device_specific++;
 749         }
 750 }
 751
 752 /*
 753  * fc_fpin_li_stats_update - routine to update Link Integrity
 754  * event statistics.
 755  * @shost:              host the FPIN was received on
 756  * @tlv:                pointer to link integrity descriptor
 757  *
 758  */
 759 static void
 760 fc_fpin_li_stats_update(struct Scsi_Host *shost, struct fc_tlv_desc *tlv)
 761 {
 762         u8 i;
 763         struct fc_rport *rport = NULL;
 764         struct fc_rport *attach_rport = NULL;
 765         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
 766         struct fc_fn_li_desc *li_desc = (struct fc_fn_li_desc *)tlv;
 767         u64 wwpn;
 768
 769         rport = fc_find_rport_by_wwpn(shost,
 770                                       be64_to_cpu(li_desc->attached_wwpn));
 771         if (rport &&
 772             (rport->roles & FC_PORT_ROLE_FCP_TARGET ||
 773              rport->roles & FC_PORT_ROLE_NVME_TARGET)) {
 774                 attach_rport = rport;
 775                 fc_li_stats_update(li_desc, &attach_rport->fpin_stats);
 776         }
 777
 778         if (be32_to_cpu(li_desc->pname_count) > 0) {
 779                 for (i = 0;
 780                     i < be32_to_cpu(li_desc->pname_count);
 781                     i++) {
 782                         wwpn = be64_to_cpu(li_desc->pname_list[i]);
 783                         rport = fc_find_rport_by_wwpn(shost, wwpn);
 784                         if (rport &&
 785                             (rport->roles & FC_PORT_ROLE_FCP_TARGET ||
 786                             rport->roles & FC_PORT_ROLE_NVME_TARGET)) {
 787                                 if (rport == attach_rport)
 788                                         continue;
 789                                 fc_li_stats_update(li_desc,
 790                                                    &rport->fpin_stats);
 791                         }
 792                 }
 793         }
 794
 795         if (fc_host->port_name == be64_to_cpu(li_desc->attached_wwpn))
 796                 fc_li_stats_update(li_desc, &fc_host->fpin_stats);
 797 }
 798
 799 /*
 800  * fc_fpin_delivery_stats_update - routine to update Delivery Notification
 801  * event statistics.
 802  * @shost:              host the FPIN was received on
 803  * @tlv:                pointer to delivery descriptor
 804  *
 805  */
 806 static void
 807 fc_fpin_delivery_stats_update(struct Scsi_Host *shost,
 808                               struct fc_tlv_desc *tlv)
 809 {
 810         struct fc_rport *rport = NULL;
 811         struct fc_rport *attach_rport = NULL;
 812         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
 813         struct fc_fn_deli_desc *dn_desc = (struct fc_fn_deli_desc *)tlv;
 814         u32 reason_code = be32_to_cpu(dn_desc->deli_reason_code);
 815
 816         rport = fc_find_rport_by_wwpn(shost,
 817                                       be64_to_cpu(dn_desc->attached_wwpn));
 818         if (rport &&
 819             (rport->roles & FC_PORT_ROLE_FCP_TARGET ||
 820              rport->roles & FC_PORT_ROLE_NVME_TARGET)) {
 821                 attach_rport = rport;
 822                 fc_delivery_stats_update(reason_code,
 823                                          &attach_rport->fpin_stats);
 824         }
 825
 826         if (fc_host->port_name == be64_to_cpu(dn_desc->attached_wwpn))
 827                 fc_delivery_stats_update(reason_code, &fc_host->fpin_stats);
 828 }
 829
 830 /*
 831  * fc_fpin_peer_congn_stats_update - routine to update Peer Congestion
 832  * event statistics.
 833  * @shost:              host the FPIN was received on
 834  * @tlv:                pointer to peer congestion descriptor
 835  *
 836  */
 837 static void
 838 fc_fpin_peer_congn_stats_update(struct Scsi_Host *shost,
 839                                 struct fc_tlv_desc *tlv)
 840 {
 841         u8 i;
 842         struct fc_rport *rport = NULL;
 843         struct fc_rport *attach_rport = NULL;
 844         struct fc_fn_peer_congn_desc *pc_desc =
 845             (struct fc_fn_peer_congn_desc *)tlv;
 846         u16 event_type = be16_to_cpu(pc_desc->event_type);
 847         u64 wwpn;
 848
 849         rport = fc_find_rport_by_wwpn(shost,
 850                                       be64_to_cpu(pc_desc->attached_wwpn));
 851         if (rport &&
 852             (rport->roles & FC_PORT_ROLE_FCP_TARGET ||
 853              rport->roles & FC_PORT_ROLE_NVME_TARGET)) {
 854                 attach_rport = rport;
 855                 fc_cn_stats_update(event_type, &attach_rport->fpin_stats);
 856         }
 857
 858         if (be32_to_cpu(pc_desc->pname_count) > 0) {
 859                 for (i = 0;
 860                     i < be32_to_cpu(pc_desc->pname_count);
 861                     i++) {
 862                         wwpn = be64_to_cpu(pc_desc->pname_list[i]);
 863                         rport = fc_find_rport_by_wwpn(shost, wwpn);
 864                         if (rport &&
 865                             (rport->roles & FC_PORT_ROLE_FCP_TARGET ||
 866                              rport->roles & FC_PORT_ROLE_NVME_TARGET)) {
 867                                 if (rport == attach_rport)
 868                                         continue;
 869                                 fc_cn_stats_update(event_type,
 870                                                    &rport->fpin_stats);
 871                         }
 872                 }
 873         }
 874 }
 875
 876 /*
 877  * fc_fpin_congn_stats_update - routine to update Congestion
 878  * event statistics.
 879  * @shost:              host the FPIN was received on
 880  * @tlv:                pointer to congestion descriptor
 881  *
 882  */
 883 static void
 884 fc_fpin_congn_stats_update(struct Scsi_Host *shost,
 885                            struct fc_tlv_desc *tlv)
 886 {
 887         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
 888         struct fc_fn_congn_desc *congn = (struct fc_fn_congn_desc *)tlv;
 889
 890         fc_cn_stats_update(be16_to_cpu(congn->event_type),
 891                            &fc_host->fpin_stats);
 892 }
 893
 894 /**
 895  * fc_host_fpin_rcv - routine to process a received FPIN.
 896  * @shost:              host the FPIN was received on
 897  * @fpin_len:           length of FPIN payload, in bytes
 898  * @fpin_buf:           pointer to FPIN payload
 899  *
 900  * Notes:
 901  *      This routine assumes no locks are held on entry.
 902  */
 903 void
 904 fc_host_fpin_rcv(struct Scsi_Host *shost, u32 fpin_len, char *fpin_buf)
 905 {
 906         struct fc_els_fpin *fpin = (struct fc_els_fpin *)fpin_buf;
 907         struct fc_tlv_desc *tlv;
 908         u32 desc_cnt = 0, bytes_remain;
 909         u32 dtag;
 910
 911         /* Update Statistics */
 912         tlv = (struct fc_tlv_desc *)&fpin->fpin_desc[0];
 913         bytes_remain = fpin_len - offsetof(struct fc_els_fpin, fpin_desc);
 914         bytes_remain = min_t(u32, bytes_remain, be32_to_cpu(fpin->desc_len));
 915
 916         while (bytes_remain >= FC_TLV_DESC_HDR_SZ &&
 917                bytes_remain >= FC_TLV_DESC_SZ_FROM_LENGTH(tlv)) {
 918                 dtag = be32_to_cpu(tlv->desc_tag);
 919                 switch (dtag) {
 920                 case ELS_DTAG_LNK_INTEGRITY:
 921                         fc_fpin_li_stats_update(shost, tlv);
 922                         break;
 923                 case ELS_DTAG_DELIVERY:
 924                         fc_fpin_delivery_stats_update(shost, tlv);
 925                         break;
 926                 case ELS_DTAG_PEER_CONGEST:
 927                         fc_fpin_peer_congn_stats_update(shost, tlv);
 928                         break;
 929                 case ELS_DTAG_CONGESTION:
 930                         fc_fpin_congn_stats_update(shost, tlv);
 931                 }
 932
 933                 desc_cnt++;
 934                 bytes_remain -= FC_TLV_DESC_SZ_FROM_LENGTH(tlv);
 935                 tlv = fc_tlv_next_desc(tlv);
 936         }
 937
 938         fc_host_post_fc_event(shost, fc_get_event_number(),
 939                                 FCH_EVT_LINK_FPIN, fpin_len, fpin_buf, 0);
 940 }
 941 EXPORT_SYMBOL(fc_host_fpin_rcv);
 942
 943
 944 static __init int fc_transport_init(void)
 945 {
 946         int error;
 947
 948         atomic_set(&fc_event_seq, 0);
 949
 950         error = transport_class_register(&fc_host_class);
 951         if (error)
 952                 return error;
 953         error = transport_class_register(&fc_vport_class);
 954         if (error)
 955                 goto unreg_host_class;
 956         error = transport_class_register(&fc_rport_class);
 957         if (error)
 958                 goto unreg_vport_class;
 959         error = transport_class_register(&fc_transport_class);
 960         if (error)
 961                 goto unreg_rport_class;
 962         return 0;
 963
 964 unreg_rport_class:
 965         transport_class_unregister(&fc_rport_class);
 966 unreg_vport_class:
 967         transport_class_unregister(&fc_vport_class);
 968 unreg_host_class:
 969         transport_class_unregister(&fc_host_class);
 970         return error;
 971 }
 972
 973 static void __exit fc_transport_exit(void)
 974 {
 975         transport_class_unregister(&fc_transport_class);
 976         transport_class_unregister(&fc_rport_class);
 977         transport_class_unregister(&fc_host_class);
 978         transport_class_unregister(&fc_vport_class);
 979 }
 980
 981 /*
 982  * FC Remote Port Attribute Management
 983  */
 984
 985 #define fc_rport_show_function(field, format_string, sz, cast)          \
 986 static ssize_t                                                          \
 987 show_fc_rport_##field (struct device *dev,                              \
 988                        struct device_attribute *attr, char *buf)        \
 989 {                                                                       \
 990         struct fc_rport *rport = transport_class_to_rport(dev);         \
 991         struct Scsi_Host *shost = rport_to_shost(rport);                \
 992         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 993         if ((i->f->get_rport_##field) &&                                \
 994             !((rport->port_state == FC_PORTSTATE_BLOCKED) ||            \
 995               (rport->port_state == FC_PORTSTATE_DELETED) ||            \
 996               (rport->port_state == FC_PORTSTATE_NOTPRESENT)))          \
 997                 i->f->get_rport_##field(rport);                         \
 998         return snprintf(buf, sz, format_string, cast rport->field);     \
 999 }
1000
1001 #define fc_rport_store_function(field)                                  \
1002 static ssize_t                                                          \
1003 store_fc_rport_##field(struct device *dev,                              \
1004                        struct device_attribute *attr,                   \
1005                        const char *buf, size_t count)                   \
1006 {                                                                       \
1007         int val;                                                        \
1008         struct fc_rport *rport = transport_class_to_rport(dev);         \
1009         struct Scsi_Host *shost = rport_to_shost(rport);                \
1010         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1011         char *cp;                                                       \
1012         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||              \
1013             (rport->port_state == FC_PORTSTATE_DELETED) ||              \
1014             (rport->port_state == FC_PORTSTATE_NOTPRESENT))             \
1015                 return -EBUSY;                                          \
1016         val = simple_strtoul(buf, &cp, 0);                              \
1017         if (*cp && (*cp != '\n'))                                       \
1018                 return -EINVAL;                                         \
1019         i->f->set_rport_##field(rport, val);                            \
1020         return count;                                                   \
1021 }
1022
1023 #define fc_rport_rd_attr(field, format_string, sz)                      \
1024         fc_rport_show_function(field, format_string, sz, )              \
1025 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
1026                          show_fc_rport_##field, NULL)
1027
1028 #define fc_rport_rd_attr_cast(field, format_string, sz, cast)           \
1029         fc_rport_show_function(field, format_string, sz, (cast))        \
1030 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
1031                           show_fc_rport_##field, NULL)
1032
1033 #define fc_rport_rw_attr(field, format_string, sz)                      \
1034         fc_rport_show_function(field, format_string, sz, )              \
1035         fc_rport_store_function(field)                                  \
1036 static FC_DEVICE_ATTR(rport, field, S_IRUGO | S_IWUSR,          \
1037                         show_fc_rport_##field,                          \
1038                         store_fc_rport_##field)
1039
1040
1041 #define fc_private_rport_show_function(field, format_string, sz, cast)  \
1042 static ssize_t                                                          \
1043 show_fc_rport_##field (struct device *dev,                              \
1044                        struct device_attribute *attr, char *buf)        \
1045 {                                                                       \
1046         struct fc_rport *rport = transport_class_to_rport(dev);         \
1047         return snprintf(buf, sz, format_string, cast rport->field);     \
1048 }
1049
1050 #define fc_private_rport_rd_attr(field, format_string, sz)              \
1051         fc_private_rport_show_function(field, format_string, sz, )      \
1052 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
1053                          show_fc_rport_##field, NULL)
1054
1055 #define fc_private_rport_rd_attr_cast(field, format_string, sz, cast)   \
1056         fc_private_rport_show_function(field, format_string, sz, (cast)) \
1057 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
1058                           show_fc_rport_##field, NULL)
1059
1060
1061 #define fc_private_rport_rd_enum_attr(title, maxlen)                    \
1062 static ssize_t                                                          \
1063 show_fc_rport_##title (struct device *dev,                              \
1064                        struct device_attribute *attr, char *buf)        \
1065 {                                                                       \
1066         struct fc_rport *rport = transport_class_to_rport(dev);         \
1067         const char *name;                                               \
1068         name = get_fc_##title##_name(rport->title);                     \
1069         if (!name)                                                      \
1070                 return -EINVAL;                                         \
1071         return snprintf(buf, maxlen, "%s\n", name);                     \
1072 }                                                                       \
1073 static FC_DEVICE_ATTR(rport, title, S_IRUGO,                    \
1074                         show_fc_rport_##title, NULL)
1075
1076
1077 #define SETUP_RPORT_ATTRIBUTE_RD(field)                                 \
1078         i->private_rport_attrs[count] = device_attr_rport_##field; \
1079         i->private_rport_attrs[count].attr.mode = S_IRUGO;              \
1080         i->private_rport_attrs[count].store = NULL;                     \
1081         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
1082         if (i->f->show_rport_##field)                                   \
1083                 count++
1084
1085 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(field)                         \
1086         i->private_rport_attrs[count] = device_attr_rport_##field; \
1087         i->private_rport_attrs[count].attr.mode = S_IRUGO;              \
1088         i->private_rport_attrs[count].store = NULL;                     \
1089         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
1090         count++
1091
1092 #define SETUP_RPORT_ATTRIBUTE_RW(field)                                 \
1093         i->private_rport_attrs[count] = device_attr_rport_##field; \
1094         if (!i->f->set_rport_##field) {                                 \
1095                 i->private_rport_attrs[count].attr.mode = S_IRUGO;      \
1096                 i->private_rport_attrs[count].store = NULL;             \
1097         }                                                               \
1098         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
1099         if (i->f->show_rport_##field)                                   \
1100                 count++
1101
1102 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(field)                         \
1103 {                                                                       \
1104         i->private_rport_attrs[count] = device_attr_rport_##field; \
1105         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
1106         count++;                                                        \
1107 }
1108
1109
1110 /* The FC Transport Remote Port Attributes: */
1111
1112 /* Fixed Remote Port Attributes */
1113
1114 fc_private_rport_rd_attr(maxframe_size, "%u bytes\n", 20);
1115
1116 static ssize_t
1117 show_fc_rport_supported_classes (struct device *dev,
1118                                  struct device_attribute *attr, char *buf)
1119 {
1120         struct fc_rport *rport = transport_class_to_rport(dev);
1121         if (rport->supported_classes == FC_COS_UNSPECIFIED)
1122                 return snprintf(buf, 20, "unspecified\n");
1123         return get_fc_cos_names(rport->supported_classes, buf);
1124 }
1125 static FC_DEVICE_ATTR(rport, supported_classes, S_IRUGO,
1126                 show_fc_rport_supported_classes, NULL);
1127
1128 /* Dynamic Remote Port Attributes */
1129
1130 /*
1131  * dev_loss_tmo attribute
1132  */
1133 static int fc_str_to_dev_loss(const char *buf, unsigned long *val)
1134 {
1135         char *cp;
1136
1137         *val = simple_strtoul(buf, &cp, 0);
1138         if (*cp && (*cp != '\n'))
1139                 return -EINVAL;
1140         /*
1141          * Check for overflow; dev_loss_tmo is u32
1142          */
1143         if (*val > UINT_MAX)
1144                 return -EINVAL;
1145
1146         return 0;
1147 }
1148
1149 static int fc_rport_set_dev_loss_tmo(struct fc_rport *rport,
1150                                      unsigned long val)
1151 {
1152         struct Scsi_Host *shost = rport_to_shost(rport);
1153         struct fc_internal *i = to_fc_internal(shost->transportt);
1154
1155         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
1156             (rport->port_state == FC_PORTSTATE_DELETED) ||
1157             (rport->port_state == FC_PORTSTATE_NOTPRESENT))
1158                 return -EBUSY;
1159         /*
1160          * Check for overflow; dev_loss_tmo is u32
1161          */
1162         if (val > UINT_MAX)
1163                 return -EINVAL;
1164
1165         /*
1166          * If fast_io_fail is off we have to cap
1167          * dev_loss_tmo at SCSI_DEVICE_BLOCK_MAX_TIMEOUT
1168          */
1169         if (rport->fast_io_fail_tmo == -1 &&
1170             val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT)
1171                 return -EINVAL;
1172
1173         i->f->set_rport_dev_loss_tmo(rport, val);
1174         return 0;
1175 }
1176
1177 fc_rport_show_function(dev_loss_tmo, "%d\n", 20, )
1178 static ssize_t
1179 store_fc_rport_dev_loss_tmo(struct device *dev, struct device_attribute *attr,
1180                             const char *buf, size_t count)
1181 {
1182         struct fc_rport *rport = transport_class_to_rport(dev);
1183         unsigned long val;
1184         int rc;
1185
1186         rc = fc_str_to_dev_loss(buf, &val);
1187         if (rc)
1188                 return rc;
1189
1190         rc = fc_rport_set_dev_loss_tmo(rport, val);
1191         if (rc)
1192                 return rc;
1193         return count;
1194 }
1195 static FC_DEVICE_ATTR(rport, dev_loss_tmo, S_IRUGO | S_IWUSR,
1196                 show_fc_rport_dev_loss_tmo, store_fc_rport_dev_loss_tmo);
1197
1198
1199 /* Private Remote Port Attributes */
1200
1201 fc_private_rport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1202 fc_private_rport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1203 fc_private_rport_rd_attr(port_id, "0x%06x\n", 20);
1204
1205 static ssize_t
1206 show_fc_rport_roles (struct device *dev, struct device_attribute *attr,
1207                      char *buf)
1208 {
1209         struct fc_rport *rport = transport_class_to_rport(dev);
1210
1211         /* identify any roles that are port_id specific */
1212         if ((rport->port_id != -1) &&
1213             (rport->port_id & FC_WELLKNOWN_PORTID_MASK) ==
1214                                         FC_WELLKNOWN_PORTID_MASK) {
1215                 switch (rport->port_id & FC_WELLKNOWN_ROLE_MASK) {
1216                 case FC_FPORT_PORTID:
1217                         return snprintf(buf, 30, "Fabric Port\n");
1218                 case FC_FABCTLR_PORTID:
1219                         return snprintf(buf, 30, "Fabric Controller\n");
1220                 case FC_DIRSRVR_PORTID:
1221                         return snprintf(buf, 30, "Directory Server\n");
1222                 case FC_TIMESRVR_PORTID:
1223                         return snprintf(buf, 30, "Time Server\n");
1224                 case FC_MGMTSRVR_PORTID:
1225                         return snprintf(buf, 30, "Management Server\n");
1226                 default:
1227                         return snprintf(buf, 30, "Unknown Fabric Entity\n");
1228                 }
1229         } else {
1230                 if (rport->roles == FC_PORT_ROLE_UNKNOWN)
1231                         return snprintf(buf, 20, "unknown\n");
1232                 return get_fc_port_roles_names(rport->roles, buf);
1233         }
1234 }
1235 static FC_DEVICE_ATTR(rport, roles, S_IRUGO,
1236                 show_fc_rport_roles, NULL);
1237
1238 fc_private_rport_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
1239 fc_private_rport_rd_attr(scsi_target_id, "%d\n", 20);
1240
1241 /*
1242  * fast_io_fail_tmo attribute
1243  */
1244 static ssize_t
1245 show_fc_rport_fast_io_fail_tmo (struct device *dev,
1246                                 struct device_attribute *attr, char *buf)
1247 {
1248         struct fc_rport *rport = transport_class_to_rport(dev);
1249
1250         if (rport->fast_io_fail_tmo == -1)
1251                 return snprintf(buf, 5, "off\n");
1252         return snprintf(buf, 20, "%d\n", rport->fast_io_fail_tmo);
1253 }
1254
1255 static ssize_t
1256 store_fc_rport_fast_io_fail_tmo(struct device *dev,
1257                                 struct device_attribute *attr, const char *buf,
1258                                 size_t count)
1259 {
1260         int val;
1261         char *cp;
1262         struct fc_rport *rport = transport_class_to_rport(dev);
1263
1264         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
1265             (rport->port_state == FC_PORTSTATE_DELETED) ||
1266             (rport->port_state == FC_PORTSTATE_NOTPRESENT))
1267                 return -EBUSY;
1268         if (strncmp(buf, "off", 3) == 0)
1269                 rport->fast_io_fail_tmo = -1;
1270         else {
1271                 val = simple_strtoul(buf, &cp, 0);
1272                 if ((*cp && (*cp != '\n')) || (val < 0))
1273                         return -EINVAL;
1274                 /*
1275                  * Cap fast_io_fail by dev_loss_tmo or
1276                  * SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
1277                  */
1278                 if ((val >= rport->dev_loss_tmo) ||
1279                     (val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT))
1280                         return -EINVAL;
1281
1282                 rport->fast_io_fail_tmo = val;
1283         }
1284         return count;
1285 }
1286 static FC_DEVICE_ATTR(rport, fast_io_fail_tmo, S_IRUGO | S_IWUSR,
1287         show_fc_rport_fast_io_fail_tmo, store_fc_rport_fast_io_fail_tmo);
1288
1289 #define fc_rport_fpin_statistic(name)                                   \
1290 static ssize_t fc_rport_fpinstat_##name(struct device *cd,              \
1291                                   struct device_attribute *attr,        \
1292                                   char *buf)                            \
1293 {                                                                       \
1294         struct fc_rport *rport = transport_class_to_rport(cd);          \
1295                                                                         \
1296         return snprintf(buf, 20, "0x%llx\n", rport->fpin_stats.name);   \
1297 }                                                                       \
1298 static FC_DEVICE_ATTR(rport, fpin_##name, 0444, fc_rport_fpinstat_##name, NULL)
1299
1300 fc_rport_fpin_statistic(dn);
1301 fc_rport_fpin_statistic(dn_unknown);
1302 fc_rport_fpin_statistic(dn_timeout);
1303 fc_rport_fpin_statistic(dn_unable_to_route);
1304 fc_rport_fpin_statistic(dn_device_specific);
1305 fc_rport_fpin_statistic(cn);
1306 fc_rport_fpin_statistic(cn_clear);
1307 fc_rport_fpin_statistic(cn_lost_credit);
1308 fc_rport_fpin_statistic(cn_credit_stall);
1309 fc_rport_fpin_statistic(cn_oversubscription);
1310 fc_rport_fpin_statistic(cn_device_specific);
1311 fc_rport_fpin_statistic(li);
1312 fc_rport_fpin_statistic(li_failure_unknown);
1313 fc_rport_fpin_statistic(li_link_failure_count);
1314 fc_rport_fpin_statistic(li_loss_of_sync_count);
1315 fc_rport_fpin_statistic(li_loss_of_signals_count);
1316 fc_rport_fpin_statistic(li_prim_seq_err_count);
1317 fc_rport_fpin_statistic(li_invalid_tx_word_count);
1318 fc_rport_fpin_statistic(li_invalid_crc_count);
1319 fc_rport_fpin_statistic(li_device_specific);
1320
1321 static struct attribute *fc_rport_statistics_attrs[] = {
1322         &device_attr_rport_fpin_dn.attr,
1323         &device_attr_rport_fpin_dn_unknown.attr,
1324         &device_attr_rport_fpin_dn_timeout.attr,
1325         &device_attr_rport_fpin_dn_unable_to_route.attr,
1326         &device_attr_rport_fpin_dn_device_specific.attr,
1327         &device_attr_rport_fpin_li.attr,
1328         &device_attr_rport_fpin_li_failure_unknown.attr,
1329         &device_attr_rport_fpin_li_link_failure_count.attr,
1330         &device_attr_rport_fpin_li_loss_of_sync_count.attr,
1331         &device_attr_rport_fpin_li_loss_of_signals_count.attr,
1332         &device_attr_rport_fpin_li_prim_seq_err_count.attr,
1333         &device_attr_rport_fpin_li_invalid_tx_word_count.attr,
1334         &device_attr_rport_fpin_li_invalid_crc_count.attr,
1335         &device_attr_rport_fpin_li_device_specific.attr,
1336         &device_attr_rport_fpin_cn.attr,
1337         &device_attr_rport_fpin_cn_clear.attr,
1338         &device_attr_rport_fpin_cn_lost_credit.attr,
1339         &device_attr_rport_fpin_cn_credit_stall.attr,
1340         &device_attr_rport_fpin_cn_oversubscription.attr,
1341         &device_attr_rport_fpin_cn_device_specific.attr,
1342         NULL
1343 };
1344
1345 static struct attribute_group fc_rport_statistics_group = {
1346         .name = "statistics",
1347         .attrs = fc_rport_statistics_attrs,
1348 };
1349
1350
1351 /*
1352  * FC SCSI Target Attribute Management
1353  */
1354
1355 /*
1356  * Note: in the target show function we recognize when the remote
1357  *  port is in the hierarchy and do not allow the driver to get
1358  *  involved in sysfs functions. The driver only gets involved if
1359  *  it's the "old" style that doesn't use rports.
1360  */
1361 #define fc_starget_show_function(field, format_string, sz, cast)        \
1362 static ssize_t                                                          \
1363 show_fc_starget_##field (struct device *dev,                            \
1364                          struct device_attribute *attr, char *buf)      \
1365 {                                                                       \
1366         struct scsi_target *starget = transport_class_to_starget(dev);  \
1367         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
1368         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1369         struct fc_rport *rport = starget_to_rport(starget);             \
1370         if (rport)                                                      \
1371                 fc_starget_##field(starget) = rport->field;             \
1372         else if (i->f->get_starget_##field)                             \
1373                 i->f->get_starget_##field(starget);                     \
1374         return snprintf(buf, sz, format_string,                         \
1375                 cast fc_starget_##field(starget));                      \
1376 }
1377
1378 #define fc_starget_rd_attr(field, format_string, sz)                    \
1379         fc_starget_show_function(field, format_string, sz, )            \
1380 static FC_DEVICE_ATTR(starget, field, S_IRUGO,                  \
1381                          show_fc_starget_##field, NULL)
1382
1383 #define fc_starget_rd_attr_cast(field, format_string, sz, cast)         \
1384         fc_starget_show_function(field, format_string, sz, (cast))      \
1385 static FC_DEVICE_ATTR(starget, field, S_IRUGO,                  \
1386                           show_fc_starget_##field, NULL)
1387
1388 #define SETUP_STARGET_ATTRIBUTE_RD(field)                               \
1389         i->private_starget_attrs[count] = device_attr_starget_##field; \
1390         i->private_starget_attrs[count].attr.mode = S_IRUGO;            \
1391         i->private_starget_attrs[count].store = NULL;                   \
1392         i->starget_attrs[count] = &i->private_starget_attrs[count];     \
1393         if (i->f->show_starget_##field)                                 \
1394                 count++
1395
1396 #define SETUP_STARGET_ATTRIBUTE_RW(field)                               \
1397         i->private_starget_attrs[count] = device_attr_starget_##field; \
1398         if (!i->f->set_starget_##field) {                               \
1399                 i->private_starget_attrs[count].attr.mode = S_IRUGO;    \
1400                 i->private_starget_attrs[count].store = NULL;           \
1401         }                                                               \
1402         i->starget_attrs[count] = &i->private_starget_attrs[count];     \
1403         if (i->f->show_starget_##field)                                 \
1404                 count++
1405
1406 /* The FC Transport SCSI Target Attributes: */
1407 fc_starget_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1408 fc_starget_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1409 fc_starget_rd_attr(port_id, "0x%06x\n", 20);
1410
1411
1412 /*
1413  * FC Virtual Port Attribute Management
1414  */
1415
1416 #define fc_vport_show_function(field, format_string, sz, cast)          \
1417 static ssize_t                                                          \
1418 show_fc_vport_##field (struct device *dev,                              \
1419                        struct device_attribute *attr, char *buf)        \
1420 {                                                                       \
1421         struct fc_vport *vport = transport_class_to_vport(dev);         \
1422         struct Scsi_Host *shost = vport_to_shost(vport);                \
1423         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1424         if ((i->f->get_vport_##field) &&                                \
1425             !(vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)))       \
1426                 i->f->get_vport_##field(vport);                         \
1427         return snprintf(buf, sz, format_string, cast vport->field);     \
1428 }
1429
1430 #define fc_vport_store_function(field)                                  \
1431 static ssize_t                                                          \
1432 store_fc_vport_##field(struct device *dev,                              \
1433                        struct device_attribute *attr,                   \
1434                        const char *buf, size_t count)                   \
1435 {                                                                       \
1436         int val;                                                        \
1437         struct fc_vport *vport = transport_class_to_vport(dev);         \
1438         struct Scsi_Host *shost = vport_to_shost(vport);                \
1439         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1440         char *cp;                                                       \
1441         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))  \
1442                 return -EBUSY;                                          \
1443         val = simple_strtoul(buf, &cp, 0);                              \
1444         if (*cp && (*cp != '\n'))                                       \
1445                 return -EINVAL;                                         \
1446         i->f->set_vport_##field(vport, val);                            \
1447         return count;                                                   \
1448 }
1449
1450 #define fc_vport_store_str_function(field, slen)                        \
1451 static ssize_t                                                          \
1452 store_fc_vport_##field(struct device *dev,                              \
1453                        struct device_attribute *attr,                   \
1454                        const char *buf, size_t count)                   \
1455 {                                                                       \
1456         struct fc_vport *vport = transport_class_to_vport(dev);         \
1457         struct Scsi_Host *shost = vport_to_shost(vport);                \
1458         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1459         unsigned int cnt=count;                                         \
1460                                                                         \
1461         /* count may include a LF at end of string */                   \
1462         if (buf[cnt-1] == '\n')                                         \
1463                 cnt--;                                                  \
1464         if (cnt > ((slen) - 1))                                         \
1465                 return -EINVAL;                                         \
1466         memcpy(vport->field, buf, cnt);                                 \
1467         i->f->set_vport_##field(vport);                                 \
1468         return count;                                                   \
1469 }
1470
1471 #define fc_vport_rd_attr(field, format_string, sz)                      \
1472         fc_vport_show_function(field, format_string, sz, )              \
1473 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1474                          show_fc_vport_##field, NULL)
1475
1476 #define fc_vport_rd_attr_cast(field, format_string, sz, cast)           \
1477         fc_vport_show_function(field, format_string, sz, (cast))        \
1478 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1479                           show_fc_vport_##field, NULL)
1480
1481 #define fc_vport_rw_attr(field, format_string, sz)                      \
1482         fc_vport_show_function(field, format_string, sz, )              \
1483         fc_vport_store_function(field)                                  \
1484 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR,          \
1485                         show_fc_vport_##field,                          \
1486                         store_fc_vport_##field)
1487
1488 #define fc_private_vport_show_function(field, format_string, sz, cast)  \
1489 static ssize_t                                                          \
1490 show_fc_vport_##field (struct device *dev,                              \
1491                        struct device_attribute *attr, char *buf)        \
1492 {                                                                       \
1493         struct fc_vport *vport = transport_class_to_vport(dev);         \
1494         return snprintf(buf, sz, format_string, cast vport->field);     \
1495 }
1496
1497 #define fc_private_vport_store_u32_function(field)                      \
1498 static ssize_t                                                          \
1499 store_fc_vport_##field(struct device *dev,                              \
1500                        struct device_attribute *attr,                   \
1501                        const char *buf, size_t count)                   \
1502 {                                                                       \
1503         u32 val;                                                        \
1504         struct fc_vport *vport = transport_class_to_vport(dev);         \
1505         char *cp;                                                       \
1506         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))          \
1507                 return -EBUSY;                                          \
1508         val = simple_strtoul(buf, &cp, 0);                              \
1509         if (*cp && (*cp != '\n'))                                       \
1510                 return -EINVAL;                                         \
1511         vport->field = val;                                             \
1512         return count;                                                   \
1513 }
1514
1515
1516 #define fc_private_vport_rd_attr(field, format_string, sz)              \
1517         fc_private_vport_show_function(field, format_string, sz, )      \
1518 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1519                          show_fc_vport_##field, NULL)
1520
1521 #define fc_private_vport_rd_attr_cast(field, format_string, sz, cast)   \
1522         fc_private_vport_show_function(field, format_string, sz, (cast)) \
1523 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1524                           show_fc_vport_##field, NULL)
1525
1526 #define fc_private_vport_rw_u32_attr(field, format_string, sz)          \
1527         fc_private_vport_show_function(field, format_string, sz, )      \
1528         fc_private_vport_store_u32_function(field)                      \
1529 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR,          \
1530                         show_fc_vport_##field,                          \
1531                         store_fc_vport_##field)
1532
1533
1534 #define fc_private_vport_rd_enum_attr(title, maxlen)                    \
1535 static ssize_t                                                          \
1536 show_fc_vport_##title (struct device *dev,                              \
1537                        struct device_attribute *attr,                   \
1538                        char *buf)                                       \
1539 {                                                                       \
1540         struct fc_vport *vport = transport_class_to_vport(dev);         \
1541         const char *name;                                               \
1542         name = get_fc_##title##_name(vport->title);                     \
1543         if (!name)                                                      \
1544                 return -EINVAL;                                         \
1545         return snprintf(buf, maxlen, "%s\n", name);                     \
1546 }                                                                       \
1547 static FC_DEVICE_ATTR(vport, title, S_IRUGO,                    \
1548                         show_fc_vport_##title, NULL)
1549
1550
1551 #define SETUP_VPORT_ATTRIBUTE_RD(field)                                 \
1552         i->private_vport_attrs[count] = device_attr_vport_##field; \
1553         i->private_vport_attrs[count].attr.mode = S_IRUGO;              \
1554         i->private_vport_attrs[count].store = NULL;                     \
1555         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1556         if (i->f->get_##field)                                          \
1557                 count++
1558         /* NOTE: Above MACRO differs: checks function not show bit */
1559
1560 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(field)                         \
1561         i->private_vport_attrs[count] = device_attr_vport_##field; \
1562         i->private_vport_attrs[count].attr.mode = S_IRUGO;              \
1563         i->private_vport_attrs[count].store = NULL;                     \
1564         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1565         count++
1566
1567 #define SETUP_VPORT_ATTRIBUTE_WR(field)                                 \
1568         i->private_vport_attrs[count] = device_attr_vport_##field; \
1569         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1570         if (i->f->field)                                                \
1571                 count++
1572         /* NOTE: Above MACRO differs: checks function */
1573
1574 #define SETUP_VPORT_ATTRIBUTE_RW(field)                                 \
1575         i->private_vport_attrs[count] = device_attr_vport_##field; \
1576         if (!i->f->set_vport_##field) {                                 \
1577                 i->private_vport_attrs[count].attr.mode = S_IRUGO;      \
1578                 i->private_vport_attrs[count].store = NULL;             \
1579         }                                                               \
1580         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1581         count++
1582         /* NOTE: Above MACRO differs: does not check show bit */
1583
1584 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RW(field)                         \
1585 {                                                                       \
1586         i->private_vport_attrs[count] = device_attr_vport_##field; \
1587         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1588         count++;                                                        \
1589 }
1590
1591
1592 /* The FC Transport Virtual Port Attributes: */
1593
1594 /* Fixed Virtual Port Attributes */
1595
1596 /* Dynamic Virtual Port Attributes */
1597
1598 /* Private Virtual Port Attributes */
1599
1600 fc_private_vport_rd_enum_attr(vport_state, FC_VPORTSTATE_MAX_NAMELEN);
1601 fc_private_vport_rd_enum_attr(vport_last_state, FC_VPORTSTATE_MAX_NAMELEN);
1602 fc_private_vport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1603 fc_private_vport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1604
1605 static ssize_t
1606 show_fc_vport_roles (struct device *dev, struct device_attribute *attr,
1607                      char *buf)
1608 {
1609         struct fc_vport *vport = transport_class_to_vport(dev);
1610
1611         if (vport->roles == FC_PORT_ROLE_UNKNOWN)
1612                 return snprintf(buf, 20, "unknown\n");
1613         return get_fc_port_roles_names(vport->roles, buf);
1614 }
1615 static FC_DEVICE_ATTR(vport, roles, S_IRUGO, show_fc_vport_roles, NULL);
1616
1617 fc_private_vport_rd_enum_attr(vport_type, FC_PORTTYPE_MAX_NAMELEN);
1618
1619 fc_private_vport_show_function(symbolic_name, "%s\n",
1620                 FC_VPORT_SYMBOLIC_NAMELEN + 1, )
1621 fc_vport_store_str_function(symbolic_name, FC_VPORT_SYMBOLIC_NAMELEN)
1622 static FC_DEVICE_ATTR(vport, symbolic_name, S_IRUGO | S_IWUSR,
1623                 show_fc_vport_symbolic_name, store_fc_vport_symbolic_name);
1624
1625 static ssize_t
1626 store_fc_vport_delete(struct device *dev, struct device_attribute *attr,
1627                       const char *buf, size_t count)
1628 {
1629         struct fc_vport *vport = transport_class_to_vport(dev);
1630         struct Scsi_Host *shost = vport_to_shost(vport);
1631         unsigned long flags;
1632
1633         spin_lock_irqsave(shost->host_lock, flags);
1634         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING | FC_VPORT_DELETING)) {
1635                 spin_unlock_irqrestore(shost->host_lock, flags);
1636                 return -EBUSY;
1637         }
1638         vport->flags |= FC_VPORT_DELETING;
1639         spin_unlock_irqrestore(shost->host_lock, flags);
1640
1641         fc_queue_work(shost, &vport->vport_delete_work);
1642         return count;
1643 }
1644 static FC_DEVICE_ATTR(vport, vport_delete, S_IWUSR,
1645                         NULL, store_fc_vport_delete);
1646
1647
1648 /*
1649  * Enable/Disable vport
1650  *  Write "1" to disable, write "0" to enable
1651  */
1652 static ssize_t
1653 store_fc_vport_disable(struct device *dev, struct device_attribute *attr,
1654                        const char *buf,
1655                            size_t count)
1656 {
1657         struct fc_vport *vport = transport_class_to_vport(dev);
1658         struct Scsi_Host *shost = vport_to_shost(vport);
1659         struct fc_internal *i = to_fc_internal(shost->transportt);
1660         int stat;
1661
1662         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))
1663                 return -EBUSY;
1664
1665         if (*buf == '0') {
1666                 if (vport->vport_state != FC_VPORT_DISABLED)
1667                         return -EALREADY;
1668         } else if (*buf == '1') {
1669                 if (vport->vport_state == FC_VPORT_DISABLED)
1670                         return -EALREADY;
1671         } else
1672                 return -EINVAL;
1673
1674         stat = i->f->vport_disable(vport, ((*buf == '0') ? false : true));
1675         return stat ? stat : count;
1676 }
1677 static FC_DEVICE_ATTR(vport, vport_disable, S_IWUSR,
1678                         NULL, store_fc_vport_disable);
1679
1680
1681 /*
1682  * Host Attribute Management
1683  */
1684
1685 #define fc_host_show_function(field, format_string, sz, cast)           \
1686 static ssize_t                                                          \
1687 show_fc_host_##field (struct device *dev,                               \
1688                       struct device_attribute *attr, char *buf)         \
1689 {                                                                       \
1690         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1691         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1692         if (i->f->get_host_##field)                                     \
1693                 i->f->get_host_##field(shost);                          \
1694         return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1695 }
1696
1697 #define fc_host_store_function(field)                                   \
1698 static ssize_t                                                          \
1699 store_fc_host_##field(struct device *dev,                               \
1700                       struct device_attribute *attr,                    \
1701                       const char *buf,  size_t count)                   \
1702 {                                                                       \
1703         int val;                                                        \
1704         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1705         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1706         char *cp;                                                       \
1707                                                                         \
1708         val = simple_strtoul(buf, &cp, 0);                              \
1709         if (*cp && (*cp != '\n'))                                       \
1710                 return -EINVAL;                                         \
1711         i->f->set_host_##field(shost, val);                             \
1712         return count;                                                   \
1713 }
1714
1715 #define fc_host_store_str_function(field, slen)                         \
1716 static ssize_t                                                          \
1717 store_fc_host_##field(struct device *dev,                               \
1718                       struct device_attribute *attr,                    \
1719                       const char *buf, size_t count)                    \
1720 {                                                                       \
1721         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1722         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1723         unsigned int cnt=count;                                         \
1724                                                                         \
1725         /* count may include a LF at end of string */                   \
1726         if (buf[cnt-1] == '\n')                                         \
1727                 cnt--;                                                  \
1728         if (cnt > ((slen) - 1))                                         \
1729                 return -EINVAL;                                         \
1730         memcpy(fc_host_##field(shost), buf, cnt);                       \
1731         i->f->set_host_##field(shost);                                  \
1732         return count;                                                   \
1733 }
1734
1735 #define fc_host_rd_attr(field, format_string, sz)                       \
1736         fc_host_show_function(field, format_string, sz, )               \
1737 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1738                          show_fc_host_##field, NULL)
1739
1740 #define fc_host_rd_attr_cast(field, format_string, sz, cast)            \
1741         fc_host_show_function(field, format_string, sz, (cast))         \
1742 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1743                           show_fc_host_##field, NULL)
1744
1745 #define fc_host_rw_attr(field, format_string, sz)                       \
1746         fc_host_show_function(field, format_string, sz, )               \
1747         fc_host_store_function(field)                                   \
1748 static FC_DEVICE_ATTR(host, field, S_IRUGO | S_IWUSR,           \
1749                         show_fc_host_##field,                           \
1750                         store_fc_host_##field)
1751
1752 #define fc_host_rd_enum_attr(title, maxlen)                             \
1753 static ssize_t                                                          \
1754 show_fc_host_##title (struct device *dev,                               \
1755                       struct device_attribute *attr, char *buf)         \
1756 {                                                                       \
1757         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1758         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1759         const char *name;                                               \
1760         if (i->f->get_host_##title)                                     \
1761                 i->f->get_host_##title(shost);                          \
1762         name = get_fc_##title##_name(fc_host_##title(shost));           \
1763         if (!name)                                                      \
1764                 return -EINVAL;                                         \
1765         return snprintf(buf, maxlen, "%s\n", name);                     \
1766 }                                                                       \
1767 static FC_DEVICE_ATTR(host, title, S_IRUGO, show_fc_host_##title, NULL)
1768
1769 #define SETUP_HOST_ATTRIBUTE_RD(field)                                  \
1770         i->private_host_attrs[count] = device_attr_host_##field;        \
1771         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
1772         i->private_host_attrs[count].store = NULL;                      \
1773         i->host_attrs[count] = &i->private_host_attrs[count];           \
1774         if (i->f->show_host_##field)                                    \
1775                 count++
1776
1777 #define SETUP_HOST_ATTRIBUTE_RD_NS(field)                               \
1778         i->private_host_attrs[count] = device_attr_host_##field;        \
1779         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
1780         i->private_host_attrs[count].store = NULL;                      \
1781         i->host_attrs[count] = &i->private_host_attrs[count];           \
1782         count++
1783
1784 #define SETUP_HOST_ATTRIBUTE_RW(field)                                  \
1785         i->private_host_attrs[count] = device_attr_host_##field;        \
1786         if (!i->f->set_host_##field) {                                  \
1787                 i->private_host_attrs[count].attr.mode = S_IRUGO;       \
1788                 i->private_host_attrs[count].store = NULL;              \
1789         }                                                               \
1790         i->host_attrs[count] = &i->private_host_attrs[count];           \
1791         if (i->f->show_host_##field)                                    \
1792                 count++
1793
1794
1795 #define fc_private_host_show_function(field, format_string, sz, cast)   \
1796 static ssize_t                                                          \
1797 show_fc_host_##field (struct device *dev,                               \
1798                       struct device_attribute *attr, char *buf)         \
1799 {                                                                       \
1800         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1801         return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1802 }
1803
1804 #define fc_private_host_rd_attr(field, format_string, sz)               \
1805         fc_private_host_show_function(field, format_string, sz, )       \
1806 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1807                          show_fc_host_##field, NULL)
1808
1809 #define fc_private_host_rd_attr_cast(field, format_string, sz, cast)    \
1810         fc_private_host_show_function(field, format_string, sz, (cast)) \
1811 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1812                           show_fc_host_##field, NULL)
1813
1814 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RD(field)                  \
1815         i->private_host_attrs[count] = device_attr_host_##field;        \
1816         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
1817         i->private_host_attrs[count].store = NULL;                      \
1818         i->host_attrs[count] = &i->private_host_attrs[count];           \
1819         count++
1820
1821 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RW(field)                  \
1822 {                                                                       \
1823         i->private_host_attrs[count] = device_attr_host_##field;        \
1824         i->host_attrs[count] = &i->private_host_attrs[count];           \
1825         count++;                                                        \
1826 }
1827
1828
1829 /* Fixed Host Attributes */
1830
1831 static ssize_t
1832 show_fc_host_supported_classes (struct device *dev,
1833                                 struct device_attribute *attr, char *buf)
1834 {
1835         struct Scsi_Host *shost = transport_class_to_shost(dev);
1836
1837         if (fc_host_supported_classes(shost) == FC_COS_UNSPECIFIED)
1838                 return snprintf(buf, 20, "unspecified\n");
1839
1840         return get_fc_cos_names(fc_host_supported_classes(shost), buf);
1841 }
1842 static FC_DEVICE_ATTR(host, supported_classes, S_IRUGO,
1843                 show_fc_host_supported_classes, NULL);
1844
1845 static ssize_t
1846 show_fc_host_supported_fc4s (struct device *dev,
1847                              struct device_attribute *attr, char *buf)
1848 {
1849         struct Scsi_Host *shost = transport_class_to_shost(dev);
1850         return (ssize_t)show_fc_fc4s(buf, fc_host_supported_fc4s(shost));
1851 }
1852 static FC_DEVICE_ATTR(host, supported_fc4s, S_IRUGO,
1853                 show_fc_host_supported_fc4s, NULL);
1854
1855 static ssize_t
1856 show_fc_host_supported_speeds (struct device *dev,
1857                                struct device_attribute *attr, char *buf)
1858 {
1859         struct Scsi_Host *shost = transport_class_to_shost(dev);
1860
1861         if (fc_host_supported_speeds(shost) == FC_PORTSPEED_UNKNOWN)
1862                 return snprintf(buf, 20, "unknown\n");
1863
1864         return get_fc_port_speed_names(fc_host_supported_speeds(shost), buf);
1865 }
1866 static FC_DEVICE_ATTR(host, supported_speeds, S_IRUGO,
1867                 show_fc_host_supported_speeds, NULL);
1868
1869
1870 fc_private_host_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1871 fc_private_host_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1872 fc_private_host_rd_attr_cast(permanent_port_name, "0x%llx\n", 20,
1873                              unsigned long long);
1874 fc_private_host_rd_attr(maxframe_size, "%u bytes\n", 20);
1875 fc_private_host_rd_attr(max_npiv_vports, "%u\n", 20);
1876 fc_private_host_rd_attr(serial_number, "%s\n", (FC_SERIAL_NUMBER_SIZE +1));
1877 fc_private_host_rd_attr(manufacturer, "%s\n", FC_SERIAL_NUMBER_SIZE + 1);
1878 fc_private_host_rd_attr(model, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1879 fc_private_host_rd_attr(model_description, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1880 fc_private_host_rd_attr(hardware_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1881 fc_private_host_rd_attr(driver_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1882 fc_private_host_rd_attr(firmware_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1883 fc_private_host_rd_attr(optionrom_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1884
1885
1886 /* Dynamic Host Attributes */
1887
1888 static ssize_t
1889 show_fc_host_active_fc4s (struct device *dev,
1890                           struct device_attribute *attr, char *buf)
1891 {
1892         struct Scsi_Host *shost = transport_class_to_shost(dev);
1893         struct fc_internal *i = to_fc_internal(shost->transportt);
1894
1895         if (i->f->get_host_active_fc4s)
1896                 i->f->get_host_active_fc4s(shost);
1897
1898         return (ssize_t)show_fc_fc4s(buf, fc_host_active_fc4s(shost));
1899 }
1900 static FC_DEVICE_ATTR(host, active_fc4s, S_IRUGO,
1901                 show_fc_host_active_fc4s, NULL);
1902
1903 static ssize_t
1904 show_fc_host_speed (struct device *dev,
1905                     struct device_attribute *attr, char *buf)
1906 {
1907         struct Scsi_Host *shost = transport_class_to_shost(dev);
1908         struct fc_internal *i = to_fc_internal(shost->transportt);
1909
1910         if (i->f->get_host_speed)
1911                 i->f->get_host_speed(shost);
1912
1913         if (fc_host_speed(shost) == FC_PORTSPEED_UNKNOWN)
1914                 return snprintf(buf, 20, "unknown\n");
1915
1916         return get_fc_port_speed_names(fc_host_speed(shost), buf);
1917 }
1918 static FC_DEVICE_ATTR(host, speed, S_IRUGO,
1919                 show_fc_host_speed, NULL);
1920
1921
1922 fc_host_rd_attr(port_id, "0x%06x\n", 20);
1923 fc_host_rd_enum_attr(port_type, FC_PORTTYPE_MAX_NAMELEN);
1924 fc_host_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
1925 fc_host_rd_attr_cast(fabric_name, "0x%llx\n", 20, unsigned long long);
1926 fc_host_rd_attr(symbolic_name, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1927
1928 fc_private_host_show_function(system_hostname, "%s\n",
1929                 FC_SYMBOLIC_NAME_SIZE + 1, )
1930 fc_host_store_str_function(system_hostname, FC_SYMBOLIC_NAME_SIZE)
1931 static FC_DEVICE_ATTR(host, system_hostname, S_IRUGO | S_IWUSR,
1932                 show_fc_host_system_hostname, store_fc_host_system_hostname);
1933
1934
1935 /* Private Host Attributes */
1936
1937 static ssize_t
1938 show_fc_private_host_tgtid_bind_type(struct device *dev,
1939                                      struct device_attribute *attr, char *buf)
1940 {
1941         struct Scsi_Host *shost = transport_class_to_shost(dev);
1942         const char *name;
1943
1944         name = get_fc_tgtid_bind_type_name(fc_host_tgtid_bind_type(shost));
1945         if (!name)
1946                 return -EINVAL;
1947         return snprintf(buf, FC_BINDTYPE_MAX_NAMELEN, "%s\n", name);
1948 }
1949
1950 #define get_list_head_entry(pos, head, member)          \
1951         pos = list_entry((head)->next, typeof(*pos), member)
1952
1953 static ssize_t
1954 store_fc_private_host_tgtid_bind_type(struct device *dev,
1955         struct device_attribute *attr, const char *buf, size_t count)
1956 {
1957         struct Scsi_Host *shost = transport_class_to_shost(dev);
1958         struct fc_rport *rport;
1959         enum fc_tgtid_binding_type val;
1960         unsigned long flags;
1961
1962         if (get_fc_tgtid_bind_type_match(buf, &val))
1963                 return -EINVAL;
1964
1965         /* if changing bind type, purge all unused consistent bindings */
1966         if (val != fc_host_tgtid_bind_type(shost)) {
1967                 spin_lock_irqsave(shost->host_lock, flags);
1968                 while (!list_empty(&fc_host_rport_bindings(shost))) {
1969                         get_list_head_entry(rport,
1970                                 &fc_host_rport_bindings(shost), peers);
1971                         list_del(&rport->peers);
1972                         rport->port_state = FC_PORTSTATE_DELETED;
1973                         fc_queue_work(shost, &rport->rport_delete_work);
1974                 }
1975                 spin_unlock_irqrestore(shost->host_lock, flags);
1976         }
1977
1978         fc_host_tgtid_bind_type(shost) = val;
1979         return count;
1980 }
1981
1982 static FC_DEVICE_ATTR(host, tgtid_bind_type, S_IRUGO | S_IWUSR,
1983                         show_fc_private_host_tgtid_bind_type,
1984                         store_fc_private_host_tgtid_bind_type);
1985
1986 static ssize_t
1987 store_fc_private_host_issue_lip(struct device *dev,
1988         struct device_attribute *attr, const char *buf, size_t count)
1989 {
1990         struct Scsi_Host *shost = transport_class_to_shost(dev);
1991         struct fc_internal *i = to_fc_internal(shost->transportt);
1992         int ret;
1993
1994         /* ignore any data value written to the attribute */
1995         if (i->f->issue_fc_host_lip) {
1996                 ret = i->f->issue_fc_host_lip(shost);
1997                 return ret ? ret: count;
1998         }
1999
2000         return -ENOENT;
2001 }
2002
2003 static FC_DEVICE_ATTR(host, issue_lip, S_IWUSR, NULL,
2004                         store_fc_private_host_issue_lip);
2005
2006 static ssize_t
2007 store_fc_private_host_dev_loss_tmo(struct device *dev,
2008                                    struct device_attribute *attr,
2009                                    const char *buf, size_t count)
2010 {
2011         struct Scsi_Host *shost = transport_class_to_shost(dev);
2012         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2013         struct fc_rport *rport;
2014         unsigned long val, flags;
2015         int rc;
2016
2017         rc = fc_str_to_dev_loss(buf, &val);
2018         if (rc)
2019                 return rc;
2020
2021         fc_host_dev_loss_tmo(shost) = val;
2022         spin_lock_irqsave(shost->host_lock, flags);
2023         list_for_each_entry(rport, &fc_host->rports, peers)
2024                 fc_rport_set_dev_loss_tmo(rport, val);
2025         spin_unlock_irqrestore(shost->host_lock, flags);
2026         return count;
2027 }
2028
2029 fc_private_host_show_function(dev_loss_tmo, "%d\n", 20, );
2030 static FC_DEVICE_ATTR(host, dev_loss_tmo, S_IRUGO | S_IWUSR,
2031                       show_fc_host_dev_loss_tmo,
2032                       store_fc_private_host_dev_loss_tmo);
2033
2034 fc_private_host_rd_attr(npiv_vports_inuse, "%u\n", 20);
2035
2036 /*
2037  * Host Statistics Management
2038  */
2039
2040 /* Show a given attribute in the statistics group */
2041 static ssize_t
2042 fc_stat_show(const struct device *dev, char *buf, unsigned long offset)
2043 {
2044         struct Scsi_Host *shost = transport_class_to_shost(dev);
2045         struct fc_internal *i = to_fc_internal(shost->transportt);
2046         struct fc_host_statistics *stats;
2047         ssize_t ret = -ENOENT;
2048
2049         if (offset > sizeof(struct fc_host_statistics) ||
2050             offset % sizeof(u64) != 0)
2051                 WARN_ON(1);
2052
2053         if (i->f->get_fc_host_stats) {
2054                 stats = (i->f->get_fc_host_stats)(shost);
2055                 if (stats)
2056                         ret = snprintf(buf, 20, "0x%llx\n",
2057                               (unsigned long long)*(u64 *)(((u8 *) stats) + offset));
2058         }
2059         return ret;
2060 }
2061
2062
2063 /* generate a read-only statistics attribute */
2064 #define fc_host_statistic(name)                                         \
2065 static ssize_t show_fcstat_##name(struct device *cd,                    \
2066                                   struct device_attribute *attr,        \
2067                                   char *buf)                            \
2068 {                                                                       \
2069         return fc_stat_show(cd, buf,                                    \
2070                             offsetof(struct fc_host_statistics, name)); \
2071 }                                                                       \
2072 static FC_DEVICE_ATTR(host, name, S_IRUGO, show_fcstat_##name, NULL)
2073
2074 fc_host_statistic(seconds_since_last_reset);
2075 fc_host_statistic(tx_frames);
2076 fc_host_statistic(tx_words);
2077 fc_host_statistic(rx_frames);
2078 fc_host_statistic(rx_words);
2079 fc_host_statistic(lip_count);
2080 fc_host_statistic(nos_count);
2081 fc_host_statistic(error_frames);
2082 fc_host_statistic(dumped_frames);
2083 fc_host_statistic(link_failure_count);
2084 fc_host_statistic(loss_of_sync_count);
2085 fc_host_statistic(loss_of_signal_count);
2086 fc_host_statistic(prim_seq_protocol_err_count);
2087 fc_host_statistic(invalid_tx_word_count);
2088 fc_host_statistic(invalid_crc_count);
2089 fc_host_statistic(fcp_input_requests);
2090 fc_host_statistic(fcp_output_requests);
2091 fc_host_statistic(fcp_control_requests);
2092 fc_host_statistic(fcp_input_megabytes);
2093 fc_host_statistic(fcp_output_megabytes);
2094 fc_host_statistic(fcp_packet_alloc_failures);
2095 fc_host_statistic(fcp_packet_aborts);
2096 fc_host_statistic(fcp_frame_alloc_failures);
2097 fc_host_statistic(fc_no_free_exch);
2098 fc_host_statistic(fc_no_free_exch_xid);
2099 fc_host_statistic(fc_xid_not_found);
2100 fc_host_statistic(fc_xid_busy);
2101 fc_host_statistic(fc_seq_not_found);
2102 fc_host_statistic(fc_non_bls_resp);
2103 fc_host_statistic(cn_sig_warn);
2104 fc_host_statistic(cn_sig_alarm);
2105
2106
2107 #define fc_host_fpin_statistic(name)                                    \
2108 static ssize_t fc_host_fpinstat_##name(struct device *cd,               \
2109                                   struct device_attribute *attr,        \
2110                                   char *buf)                            \
2111 {                                                                       \
2112         struct Scsi_Host *shost = transport_class_to_shost(cd);         \
2113         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);        \
2114                                                                         \
2115         return snprintf(buf, 20, "0x%llx\n", fc_host->fpin_stats.name); \
2116 }                                                                       \
2117 static FC_DEVICE_ATTR(host, fpin_##name, 0444, fc_host_fpinstat_##name, NULL)
2118
2119 fc_host_fpin_statistic(dn);
2120 fc_host_fpin_statistic(dn_unknown);
2121 fc_host_fpin_statistic(dn_timeout);
2122 fc_host_fpin_statistic(dn_unable_to_route);
2123 fc_host_fpin_statistic(dn_device_specific);
2124 fc_host_fpin_statistic(cn);
2125 fc_host_fpin_statistic(cn_clear);
2126 fc_host_fpin_statistic(cn_lost_credit);
2127 fc_host_fpin_statistic(cn_credit_stall);
2128 fc_host_fpin_statistic(cn_oversubscription);
2129 fc_host_fpin_statistic(cn_device_specific);
2130 fc_host_fpin_statistic(li);
2131 fc_host_fpin_statistic(li_failure_unknown);
2132 fc_host_fpin_statistic(li_link_failure_count);
2133 fc_host_fpin_statistic(li_loss_of_sync_count);
2134 fc_host_fpin_statistic(li_loss_of_signals_count);
2135 fc_host_fpin_statistic(li_prim_seq_err_count);
2136 fc_host_fpin_statistic(li_invalid_tx_word_count);
2137 fc_host_fpin_statistic(li_invalid_crc_count);
2138 fc_host_fpin_statistic(li_device_specific);
2139
2140 static ssize_t
2141 fc_reset_statistics(struct device *dev, struct device_attribute *attr,
2142                     const char *buf, size_t count)
2143 {
2144         struct Scsi_Host *shost = transport_class_to_shost(dev);
2145         struct fc_internal *i = to_fc_internal(shost->transportt);
2146
2147         /* ignore any data value written to the attribute */
2148         if (i->f->reset_fc_host_stats) {
2149                 i->f->reset_fc_host_stats(shost);
2150                 return count;
2151         }
2152
2153         return -ENOENT;
2154 }
2155 static FC_DEVICE_ATTR(host, reset_statistics, S_IWUSR, NULL,
2156                                 fc_reset_statistics);
2157
2158 static struct attribute *fc_statistics_attrs[] = {
2159         &device_attr_host_seconds_since_last_reset.attr,
2160         &device_attr_host_tx_frames.attr,
2161         &device_attr_host_tx_words.attr,
2162         &device_attr_host_rx_frames.attr,
2163         &device_attr_host_rx_words.attr,
2164         &device_attr_host_lip_count.attr,
2165         &device_attr_host_nos_count.attr,
2166         &device_attr_host_error_frames.attr,
2167         &device_attr_host_dumped_frames.attr,
2168         &device_attr_host_link_failure_count.attr,
2169         &device_attr_host_loss_of_sync_count.attr,
2170         &device_attr_host_loss_of_signal_count.attr,
2171         &device_attr_host_prim_seq_protocol_err_count.attr,
2172         &device_attr_host_invalid_tx_word_count.attr,
2173         &device_attr_host_invalid_crc_count.attr,
2174         &device_attr_host_fcp_input_requests.attr,
2175         &device_attr_host_fcp_output_requests.attr,
2176         &device_attr_host_fcp_control_requests.attr,
2177         &device_attr_host_fcp_input_megabytes.attr,
2178         &device_attr_host_fcp_output_megabytes.attr,
2179         &device_attr_host_fcp_packet_alloc_failures.attr,
2180         &device_attr_host_fcp_packet_aborts.attr,
2181         &device_attr_host_fcp_frame_alloc_failures.attr,
2182         &device_attr_host_fc_no_free_exch.attr,
2183         &device_attr_host_fc_no_free_exch_xid.attr,
2184         &device_attr_host_fc_xid_not_found.attr,
2185         &device_attr_host_fc_xid_busy.attr,
2186         &device_attr_host_fc_seq_not_found.attr,
2187         &device_attr_host_fc_non_bls_resp.attr,
2188         &device_attr_host_cn_sig_warn.attr,
2189         &device_attr_host_cn_sig_alarm.attr,
2190         &device_attr_host_reset_statistics.attr,
2191         &device_attr_host_fpin_dn.attr,
2192         &device_attr_host_fpin_dn_unknown.attr,
2193         &device_attr_host_fpin_dn_timeout.attr,
2194         &device_attr_host_fpin_dn_unable_to_route.attr,
2195         &device_attr_host_fpin_dn_device_specific.attr,
2196         &device_attr_host_fpin_li.attr,
2197         &device_attr_host_fpin_li_failure_unknown.attr,
2198         &device_attr_host_fpin_li_link_failure_count.attr,
2199         &device_attr_host_fpin_li_loss_of_sync_count.attr,
2200         &device_attr_host_fpin_li_loss_of_signals_count.attr,
2201         &device_attr_host_fpin_li_prim_seq_err_count.attr,
2202         &device_attr_host_fpin_li_invalid_tx_word_count.attr,
2203         &device_attr_host_fpin_li_invalid_crc_count.attr,
2204         &device_attr_host_fpin_li_device_specific.attr,
2205         &device_attr_host_fpin_cn.attr,
2206         &device_attr_host_fpin_cn_clear.attr,
2207         &device_attr_host_fpin_cn_lost_credit.attr,
2208         &device_attr_host_fpin_cn_credit_stall.attr,
2209         &device_attr_host_fpin_cn_oversubscription.attr,
2210         &device_attr_host_fpin_cn_device_specific.attr,
2211         NULL
2212 };
2213
2214 static struct attribute_group fc_statistics_group = {
2215         .name = "statistics",
2216         .attrs = fc_statistics_attrs,
2217 };
2218
2219
2220 /* Host Vport Attributes */
2221
2222 static int
2223 fc_parse_wwn(const char *ns, u64 *nm)
2224 {
2225         unsigned int i, j;
2226         u8 wwn[8];
2227
2228         memset(wwn, 0, sizeof(wwn));
2229
2230         /* Validate and store the new name */
2231         for (i=0, j=0; i < 16; i++) {
2232                 int value;
2233
2234                 value = hex_to_bin(*ns++);
2235                 if (value >= 0)
2236                         j = (j << 4) | value;
2237                 else
2238                         return -EINVAL;
2239                 if (i % 2) {
2240                         wwn[i/2] = j & 0xff;
2241                         j = 0;
2242                 }
2243         }
2244
2245         *nm = wwn_to_u64(wwn);
2246
2247         return 0;
2248 }
2249
2250
2251 /*
2252  * "Short-cut" sysfs variable to create a new vport on a FC Host.
2253  * Input is a string of the form "<WWPN>:<WWNN>". Other attributes
2254  * will default to a NPIV-based FCP_Initiator; The WWNs are specified
2255  * as hex characters, and may *not* contain any prefixes (e.g. 0x, x, etc)
2256  */
2257 static ssize_t
2258 store_fc_host_vport_create(struct device *dev, struct device_attribute *attr,
2259                            const char *buf, size_t count)
2260 {
2261         struct Scsi_Host *shost = transport_class_to_shost(dev);
2262         struct fc_vport_identifiers vid;
2263         struct fc_vport *vport;
2264         unsigned int cnt=count;
2265         int stat;
2266
2267         memset(&vid, 0, sizeof(vid));
2268
2269         /* count may include a LF at end of string */
2270         if (buf[cnt-1] == '\n')
2271                 cnt--;
2272
2273         /* validate we have enough characters for WWPN */
2274         if ((cnt != (16+1+16)) || (buf[16] != ':'))
2275                 return -EINVAL;
2276
2277         stat = fc_parse_wwn(&buf[0], &vid.port_name);
2278         if (stat)
2279                 return stat;
2280
2281         stat = fc_parse_wwn(&buf[17], &vid.node_name);
2282         if (stat)
2283                 return stat;
2284
2285         vid.roles = FC_PORT_ROLE_FCP_INITIATOR;
2286         vid.vport_type = FC_PORTTYPE_NPIV;
2287         /* vid.symbolic_name is already zero/NULL's */
2288         vid.disable = false;            /* always enabled */
2289
2290         /* we only allow support on Channel 0 !!! */
2291         stat = fc_vport_setup(shost, 0, &shost->shost_gendev, &vid, &vport);
2292         return stat ? stat : count;
2293 }
2294 static FC_DEVICE_ATTR(host, vport_create, S_IWUSR, NULL,
2295                         store_fc_host_vport_create);
2296
2297
2298 /*
2299  * "Short-cut" sysfs variable to delete a vport on a FC Host.
2300  * Vport is identified by a string containing "<WWPN>:<WWNN>".
2301  * The WWNs are specified as hex characters, and may *not* contain
2302  * any prefixes (e.g. 0x, x, etc)
2303  */
2304 static ssize_t
2305 store_fc_host_vport_delete(struct device *dev, struct device_attribute *attr,
2306                            const char *buf, size_t count)
2307 {
2308         struct Scsi_Host *shost = transport_class_to_shost(dev);
2309         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2310         struct fc_vport *vport;
2311         u64 wwpn, wwnn;
2312         unsigned long flags;
2313         unsigned int cnt=count;
2314         int stat, match;
2315
2316         /* count may include a LF at end of string */
2317         if (buf[cnt-1] == '\n')
2318                 cnt--;
2319
2320         /* validate we have enough characters for WWPN */
2321         if ((cnt != (16+1+16)) || (buf[16] != ':'))
2322                 return -EINVAL;
2323
2324         stat = fc_parse_wwn(&buf[0], &wwpn);
2325         if (stat)
2326                 return stat;
2327
2328         stat = fc_parse_wwn(&buf[17], &wwnn);
2329         if (stat)
2330                 return stat;
2331
2332         spin_lock_irqsave(shost->host_lock, flags);
2333         match = 0;
2334         /* we only allow support on Channel 0 !!! */
2335         list_for_each_entry(vport, &fc_host->vports, peers) {
2336                 if ((vport->channel == 0) &&
2337                     (vport->port_name == wwpn) && (vport->node_name == wwnn)) {
2338                         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))
2339                                 break;
2340                         vport->flags |= FC_VPORT_DELETING;
2341                         match = 1;
2342                         break;
2343                 }
2344         }
2345         spin_unlock_irqrestore(shost->host_lock, flags);
2346
2347         if (!match)
2348                 return -ENODEV;
2349
2350         stat = fc_vport_terminate(vport);
2351         return stat ? stat : count;
2352 }
2353 static FC_DEVICE_ATTR(host, vport_delete, S_IWUSR, NULL,
2354                         store_fc_host_vport_delete);
2355
2356
2357 static int fc_host_match(struct attribute_container *cont,
2358                           struct device *dev)
2359 {
2360         struct Scsi_Host *shost;
2361         struct fc_internal *i;
2362
2363         if (!scsi_is_host_device(dev))
2364                 return 0;
2365
2366         shost = dev_to_shost(dev);
2367         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
2368             != &fc_host_class.class)
2369                 return 0;
2370
2371         i = to_fc_internal(shost->transportt);
2372
2373         return &i->t.host_attrs.ac == cont;
2374 }
2375
2376 static int fc_target_match(struct attribute_container *cont,
2377                             struct device *dev)
2378 {
2379         struct Scsi_Host *shost;
2380         struct fc_internal *i;
2381
2382         if (!scsi_is_target_device(dev))
2383                 return 0;
2384
2385         shost = dev_to_shost(dev->parent);
2386         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
2387             != &fc_host_class.class)
2388                 return 0;
2389
2390         i = to_fc_internal(shost->transportt);
2391
2392         return &i->t.target_attrs.ac == cont;
2393 }
2394
2395 static void fc_rport_dev_release(struct device *dev)
2396 {
2397         struct fc_rport *rport = dev_to_rport(dev);
2398         put_device(dev->parent);
2399         kfree(rport);
2400 }
2401
2402 int scsi_is_fc_rport(const struct device *dev)
2403 {
2404         return dev->release == fc_rport_dev_release;
2405 }
2406 EXPORT_SYMBOL(scsi_is_fc_rport);
2407
2408 static int fc_rport_match(struct attribute_container *cont,
2409                             struct device *dev)
2410 {
2411         struct Scsi_Host *shost;
2412         struct fc_internal *i;
2413
2414         if (!scsi_is_fc_rport(dev))
2415                 return 0;
2416
2417         shost = dev_to_shost(dev->parent);
2418         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
2419             != &fc_host_class.class)
2420                 return 0;
2421
2422         i = to_fc_internal(shost->transportt);
2423
2424         return &i->rport_attr_cont.ac == cont;
2425 }
2426
2427
2428 static void fc_vport_dev_release(struct device *dev)
2429 {
2430         struct fc_vport *vport = dev_to_vport(dev);
2431         put_device(dev->parent);                /* release kobj parent */
2432         kfree(vport);
2433 }
2434
2435 static int scsi_is_fc_vport(const struct device *dev)
2436 {
2437         return dev->release == fc_vport_dev_release;
2438 }
2439
2440 static int fc_vport_match(struct attribute_container *cont,
2441                             struct device *dev)
2442 {
2443         struct fc_vport *vport;
2444         struct Scsi_Host *shost;
2445         struct fc_internal *i;
2446
2447         if (!scsi_is_fc_vport(dev))
2448                 return 0;
2449         vport = dev_to_vport(dev);
2450
2451         shost = vport_to_shost(vport);
2452         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
2453             != &fc_host_class.class)
2454                 return 0;
2455
2456         i = to_fc_internal(shost->transportt);
2457         return &i->vport_attr_cont.ac == cont;
2458 }
2459
2460
2461 /**
2462  * fc_eh_timed_out - FC Transport I/O timeout intercept handler
2463  * @scmd:       The SCSI command which timed out
2464  *
2465  * This routine protects against error handlers getting invoked while a
2466  * rport is in a blocked state, typically due to a temporarily loss of
2467  * connectivity. If the error handlers are allowed to proceed, requests
2468  * to abort i/o, reset the target, etc will likely fail as there is no way
2469  * to communicate with the device to perform the requested function. These
2470  * failures may result in the midlayer taking the device offline, requiring
2471  * manual intervention to restore operation.
2472  *
2473  * This routine, called whenever an i/o times out, validates the state of
2474  * the underlying rport. If the rport is blocked, it returns
2475  * EH_RESET_TIMER, which will continue to reschedule the timeout.
2476  * Eventually, either the device will return, or devloss_tmo will fire,
2477  * and when the timeout then fires, it will be handled normally.
2478  * If the rport is not blocked, normal error handling continues.
2479  *
2480  * Notes:
2481  *      This routine assumes no locks are held on entry.
2482  */
2483 enum blk_eh_timer_return
2484 fc_eh_timed_out(struct scsi_cmnd *scmd)
2485 {
2486         struct fc_rport *rport = starget_to_rport(scsi_target(scmd->device));
2487
2488         if (rport->port_state == FC_PORTSTATE_BLOCKED)
2489                 return BLK_EH_RESET_TIMER;
2490
2491         return BLK_EH_DONE;
2492 }
2493 EXPORT_SYMBOL(fc_eh_timed_out);
2494
2495 /*
2496  * Called by fc_user_scan to locate an rport on the shost that
2497  * matches the channel and target id, and invoke scsi_scan_target()
2498  * on the rport.
2499  */
2500 static void
2501 fc_user_scan_tgt(struct Scsi_Host *shost, uint channel, uint id, u64 lun)
2502 {
2503         struct fc_rport *rport;
2504         unsigned long flags;
2505
2506         spin_lock_irqsave(shost->host_lock, flags);
2507
2508         list_for_each_entry(rport, &fc_host_rports(shost), peers) {
2509                 if (rport->scsi_target_id == -1)
2510                         continue;
2511
2512                 if (rport->port_state != FC_PORTSTATE_ONLINE)
2513                         continue;
2514
2515                 if ((channel == rport->channel) &&
2516                     (id == rport->scsi_target_id)) {
2517                         spin_unlock_irqrestore(shost->host_lock, flags);
2518                         scsi_scan_target(&rport->dev, channel, id, lun,
2519                                          SCSI_SCAN_MANUAL);
2520                         return;
2521                 }
2522         }
2523
2524         spin_unlock_irqrestore(shost->host_lock, flags);
2525 }
2526
2527 /*
2528  * Called via sysfs scan routines. Necessary, as the FC transport
2529  * wants to place all target objects below the rport object. So this
2530  * routine must invoke the scsi_scan_target() routine with the rport
2531  * object as the parent.
2532  */
2533 static int
2534 fc_user_scan(struct Scsi_Host *shost, uint channel, uint id, u64 lun)
2535 {
2536         uint chlo, chhi;
2537         uint tgtlo, tgthi;
2538
2539         if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
2540             ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) ||
2541             ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun)))
2542                 return -EINVAL;
2543
2544         if (channel == SCAN_WILD_CARD) {
2545                 chlo = 0;
2546                 chhi = shost->max_channel + 1;
2547         } else {
2548                 chlo = channel;
2549                 chhi = channel + 1;
2550         }
2551
2552         if (id == SCAN_WILD_CARD) {
2553                 tgtlo = 0;
2554                 tgthi = shost->max_id;
2555         } else {
2556                 tgtlo = id;
2557                 tgthi = id + 1;
2558         }
2559
2560         for ( ; chlo < chhi; chlo++)
2561                 for ( ; tgtlo < tgthi; tgtlo++)
2562                         fc_user_scan_tgt(shost, chlo, tgtlo, lun);
2563
2564         return 0;
2565 }
2566
2567 struct scsi_transport_template *
2568 fc_attach_transport(struct fc_function_template *ft)
2569 {
2570         int count;
2571         struct fc_internal *i = kzalloc(sizeof(struct fc_internal),
2572                                         GFP_KERNEL);
2573
2574         if (unlikely(!i))
2575                 return NULL;
2576
2577         i->t.target_attrs.ac.attrs = &i->starget_attrs[0];
2578         i->t.target_attrs.ac.class = &fc_transport_class.class;
2579         i->t.target_attrs.ac.match = fc_target_match;
2580         i->t.target_size = sizeof(struct fc_starget_attrs);
2581         transport_container_register(&i->t.target_attrs);
2582
2583         i->t.host_attrs.ac.attrs = &i->host_attrs[0];
2584         i->t.host_attrs.ac.class = &fc_host_class.class;
2585         i->t.host_attrs.ac.match = fc_host_match;
2586         i->t.host_size = sizeof(struct fc_host_attrs);
2587         if (ft->get_fc_host_stats)
2588                 i->t.host_attrs.statistics = &fc_statistics_group;
2589         transport_container_register(&i->t.host_attrs);
2590
2591         i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];
2592         i->rport_attr_cont.ac.class = &fc_rport_class.class;
2593         i->rport_attr_cont.ac.match = fc_rport_match;
2594         i->rport_attr_cont.statistics = &fc_rport_statistics_group;
2595         transport_container_register(&i->rport_attr_cont);
2596
2597         i->vport_attr_cont.ac.attrs = &i->vport_attrs[0];
2598         i->vport_attr_cont.ac.class = &fc_vport_class.class;
2599         i->vport_attr_cont.ac.match = fc_vport_match;
2600         transport_container_register(&i->vport_attr_cont);
2601
2602         i->f = ft;
2603
2604         /* Transport uses the shost workq for scsi scanning */
2605         i->t.create_work_queue = 1;
2606
2607         i->t.user_scan = fc_user_scan;
2608
2609         /*
2610          * Setup SCSI Target Attributes.
2611          */
2612         count = 0;
2613         SETUP_STARGET_ATTRIBUTE_RD(node_name);
2614         SETUP_STARGET_ATTRIBUTE_RD(port_name);
2615         SETUP_STARGET_ATTRIBUTE_RD(port_id);
2616
2617         BUG_ON(count > FC_STARGET_NUM_ATTRS);
2618
2619         i->starget_attrs[count] = NULL;
2620
2621
2622         /*
2623          * Setup SCSI Host Attributes.
2624          */
2625         count=0;
2626         SETUP_HOST_ATTRIBUTE_RD(node_name);
2627         SETUP_HOST_ATTRIBUTE_RD(port_name);
2628         SETUP_HOST_ATTRIBUTE_RD(permanent_port_name);
2629         SETUP_HOST_ATTRIBUTE_RD(supported_classes);
2630         SETUP_HOST_ATTRIBUTE_RD(supported_fc4s);
2631         SETUP_HOST_ATTRIBUTE_RD(supported_speeds);
2632         SETUP_HOST_ATTRIBUTE_RD(maxframe_size);
2633         if (ft->vport_create) {
2634                 SETUP_HOST_ATTRIBUTE_RD_NS(max_npiv_vports);
2635                 SETUP_HOST_ATTRIBUTE_RD_NS(npiv_vports_inuse);
2636         }
2637         SETUP_HOST_ATTRIBUTE_RD(serial_number);
2638         SETUP_HOST_ATTRIBUTE_RD(manufacturer);
2639         SETUP_HOST_ATTRIBUTE_RD(model);
2640         SETUP_HOST_ATTRIBUTE_RD(model_description);
2641         SETUP_HOST_ATTRIBUTE_RD(hardware_version);
2642         SETUP_HOST_ATTRIBUTE_RD(driver_version);
2643         SETUP_HOST_ATTRIBUTE_RD(firmware_version);
2644         SETUP_HOST_ATTRIBUTE_RD(optionrom_version);
2645
2646         SETUP_HOST_ATTRIBUTE_RD(port_id);
2647         SETUP_HOST_ATTRIBUTE_RD(port_type);
2648         SETUP_HOST_ATTRIBUTE_RD(port_state);
2649         SETUP_HOST_ATTRIBUTE_RD(active_fc4s);
2650         SETUP_HOST_ATTRIBUTE_RD(speed);
2651         SETUP_HOST_ATTRIBUTE_RD(fabric_name);
2652         SETUP_HOST_ATTRIBUTE_RD(symbolic_name);
2653         SETUP_HOST_ATTRIBUTE_RW(system_hostname);
2654
2655         /* Transport-managed attributes */
2656         SETUP_PRIVATE_HOST_ATTRIBUTE_RW(dev_loss_tmo);
2657         SETUP_PRIVATE_HOST_ATTRIBUTE_RW(tgtid_bind_type);
2658         if (ft->issue_fc_host_lip)
2659                 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(issue_lip);
2660         if (ft->vport_create)
2661                 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_create);
2662         if (ft->vport_delete)
2663                 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_delete);
2664
2665         BUG_ON(count > FC_HOST_NUM_ATTRS);
2666
2667         i->host_attrs[count] = NULL;
2668
2669         /*
2670          * Setup Remote Port Attributes.
2671          */
2672         count=0;
2673         SETUP_RPORT_ATTRIBUTE_RD(maxframe_size);
2674         SETUP_RPORT_ATTRIBUTE_RD(supported_classes);
2675         SETUP_RPORT_ATTRIBUTE_RW(dev_loss_tmo);
2676         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(node_name);
2677         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_name);
2678         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_id);
2679         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(roles);
2680         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_state);
2681         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(scsi_target_id);
2682         SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(fast_io_fail_tmo);
2683
2684         BUG_ON(count > FC_RPORT_NUM_ATTRS);
2685
2686         i->rport_attrs[count] = NULL;
2687
2688         /*
2689          * Setup Virtual Port Attributes.
2690          */
2691         count=0;
2692         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_state);
2693         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_last_state);
2694         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(node_name);
2695         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(port_name);
2696         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(roles);
2697         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_type);
2698         SETUP_VPORT_ATTRIBUTE_RW(symbolic_name);
2699         SETUP_VPORT_ATTRIBUTE_WR(vport_delete);
2700         SETUP_VPORT_ATTRIBUTE_WR(vport_disable);
2701
2702         BUG_ON(count > FC_VPORT_NUM_ATTRS);
2703
2704         i->vport_attrs[count] = NULL;
2705
2706         return &i->t;
2707 }
2708 EXPORT_SYMBOL(fc_attach_transport);
2709
2710 void fc_release_transport(struct scsi_transport_template *t)
2711 {
2712         struct fc_internal *i = to_fc_internal(t);
2713
2714         transport_container_unregister(&i->t.target_attrs);
2715         transport_container_unregister(&i->t.host_attrs);
2716         transport_container_unregister(&i->rport_attr_cont);
2717         transport_container_unregister(&i->vport_attr_cont);
2718
2719         kfree(i);
2720 }
2721 EXPORT_SYMBOL(fc_release_transport);
2722
2723 /**
2724  * fc_queue_work - Queue work to the fc_host workqueue.
2725  * @shost:      Pointer to Scsi_Host bound to fc_host.
2726  * @work:       Work to queue for execution.
2727  *
2728  * Return value:
2729  *      1 - work queued for execution
2730  *      0 - work is already queued
2731  *      -EINVAL - work queue doesn't exist
2732  */
2733 static int
2734 fc_queue_work(struct Scsi_Host *shost, struct work_struct *work)
2735 {
2736         if (unlikely(!fc_host_work_q(shost))) {
2737                 printk(KERN_ERR
2738                         "ERROR: FC host '%s' attempted to queue work, "
2739                         "when no workqueue created.\n", shost->hostt->name);
2740                 dump_stack();
2741
2742                 return -EINVAL;
2743         }
2744
2745         return queue_work(fc_host_work_q(shost), work);
2746 }
2747
2748 /**
2749  * fc_flush_work - Flush a fc_host's workqueue.
2750  * @shost:      Pointer to Scsi_Host bound to fc_host.
2751  */
2752 static void
2753 fc_flush_work(struct Scsi_Host *shost)
2754 {
2755         if (!fc_host_work_q(shost)) {
2756                 printk(KERN_ERR
2757                         "ERROR: FC host '%s' attempted to flush work, "
2758                         "when no workqueue created.\n", shost->hostt->name);
2759                 dump_stack();
2760                 return;
2761         }
2762
2763         flush_workqueue(fc_host_work_q(shost));
2764 }
2765
2766 /**
2767  * fc_queue_devloss_work - Schedule work for the fc_host devloss workqueue.
2768  * @shost:      Pointer to Scsi_Host bound to fc_host.
2769  * @work:       Work to queue for execution.
2770  * @delay:      jiffies to delay the work queuing
2771  *
2772  * Return value:
2773  *      1 on success / 0 already queued / < 0 for error
2774  */
2775 static int
2776 fc_queue_devloss_work(struct Scsi_Host *shost, struct delayed_work *work,
2777                                 unsigned long delay)
2778 {
2779         if (unlikely(!fc_host_devloss_work_q(shost))) {
2780                 printk(KERN_ERR
2781                         "ERROR: FC host '%s' attempted to queue work, "
2782                         "when no workqueue created.\n", shost->hostt->name);
2783                 dump_stack();
2784
2785                 return -EINVAL;
2786         }
2787
2788         return queue_delayed_work(fc_host_devloss_work_q(shost), work, delay);
2789 }
2790
2791 /**
2792  * fc_flush_devloss - Flush a fc_host's devloss workqueue.
2793  * @shost:      Pointer to Scsi_Host bound to fc_host.
2794  */
2795 static void
2796 fc_flush_devloss(struct Scsi_Host *shost)
2797 {
2798         if (!fc_host_devloss_work_q(shost)) {
2799                 printk(KERN_ERR
2800                         "ERROR: FC host '%s' attempted to flush work, "
2801                         "when no workqueue created.\n", shost->hostt->name);
2802                 dump_stack();
2803                 return;
2804         }
2805
2806         flush_workqueue(fc_host_devloss_work_q(shost));
2807 }
2808
2809
2810 /**
2811  * fc_remove_host - called to terminate any fc_transport-related elements for a scsi host.
2812  * @shost:      Which &Scsi_Host
2813  *
2814  * This routine is expected to be called immediately preceding the
2815  * a driver's call to scsi_remove_host().
2816  *
2817  * WARNING: A driver utilizing the fc_transport, which fails to call
2818  *   this routine prior to scsi_remove_host(), will leave dangling
2819  *   objects in /sys/class/fc_remote_ports. Access to any of these
2820  *   objects can result in a system crash !!!
2821  *
2822  * Notes:
2823  *      This routine assumes no locks are held on entry.
2824  */
2825 void
2826 fc_remove_host(struct Scsi_Host *shost)
2827 {
2828         struct fc_vport *vport = NULL, *next_vport = NULL;
2829         struct fc_rport *rport = NULL, *next_rport = NULL;
2830         struct workqueue_struct *work_q;
2831         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2832         unsigned long flags;
2833
2834         spin_lock_irqsave(shost->host_lock, flags);
2835
2836         /* Remove any vports */
2837         list_for_each_entry_safe(vport, next_vport, &fc_host->vports, peers) {
2838                 vport->flags |= FC_VPORT_DELETING;
2839                 fc_queue_work(shost, &vport->vport_delete_work);
2840         }
2841
2842         /* Remove any remote ports */
2843         list_for_each_entry_safe(rport, next_rport,
2844                         &fc_host->rports, peers) {
2845                 list_del(&rport->peers);
2846                 rport->port_state = FC_PORTSTATE_DELETED;
2847                 fc_queue_work(shost, &rport->rport_delete_work);
2848         }
2849
2850         list_for_each_entry_safe(rport, next_rport,
2851                         &fc_host->rport_bindings, peers) {
2852                 list_del(&rport->peers);
2853                 rport->port_state = FC_PORTSTATE_DELETED;
2854                 fc_queue_work(shost, &rport->rport_delete_work);
2855         }
2856
2857         spin_unlock_irqrestore(shost->host_lock, flags);
2858
2859         /* flush all scan work items */
2860         scsi_flush_work(shost);
2861
2862         /* flush all stgt delete, and rport delete work items, then kill it  */
2863         if (fc_host->work_q) {
2864                 work_q = fc_host->work_q;
2865                 fc_host->work_q = NULL;
2866                 destroy_workqueue(work_q);
2867         }
2868
2869         /* flush all devloss work items, then kill it  */
2870         if (fc_host->devloss_work_q) {
2871                 work_q = fc_host->devloss_work_q;
2872                 fc_host->devloss_work_q = NULL;
2873                 destroy_workqueue(work_q);
2874         }
2875 }
2876 EXPORT_SYMBOL(fc_remove_host);
2877
2878 static void fc_terminate_rport_io(struct fc_rport *rport)
2879 {
2880         struct Scsi_Host *shost = rport_to_shost(rport);
2881         struct fc_internal *i = to_fc_internal(shost->transportt);
2882
2883         /* Involve the LLDD if possible to terminate all io on the rport. */
2884         if (i->f->terminate_rport_io)
2885                 i->f->terminate_rport_io(rport);
2886
2887         /*
2888          * Must unblock to flush queued IO. scsi-ml will fail incoming reqs.
2889          */
2890         scsi_target_unblock(&rport->dev, SDEV_TRANSPORT_OFFLINE);
2891 }
2892
2893 /**
2894  * fc_starget_delete - called to delete the scsi descendants of an rport
2895  * @work:       remote port to be operated on.
2896  *
2897  * Deletes target and all sdevs.
2898  */
2899 static void
2900 fc_starget_delete(struct work_struct *work)
2901 {
2902         struct fc_rport *rport =
2903                 container_of(work, struct fc_rport, stgt_delete_work);
2904
2905         fc_terminate_rport_io(rport);
2906         scsi_remove_target(&rport->dev);
2907 }
2908
2909
2910 /**
2911  * fc_rport_final_delete - finish rport termination and delete it.
2912  * @work:       remote port to be deleted.
2913  */
2914 static void
2915 fc_rport_final_delete(struct work_struct *work)
2916 {
2917         struct fc_rport *rport =
2918                 container_of(work, struct fc_rport, rport_delete_work);
2919         struct device *dev = &rport->dev;
2920         struct Scsi_Host *shost = rport_to_shost(rport);
2921         struct fc_internal *i = to_fc_internal(shost->transportt);
2922         unsigned long flags;
2923         int do_callback = 0;
2924
2925         fc_terminate_rport_io(rport);
2926
2927         /*
2928          * if a scan is pending, flush the SCSI Host work_q so that
2929          * that we can reclaim the rport scan work element.
2930          */
2931         if (rport->flags & FC_RPORT_SCAN_PENDING)
2932                 scsi_flush_work(shost);
2933
2934         /*
2935          * Cancel any outstanding timers. These should really exist
2936          * only when rmmod'ing the LLDD and we're asking for
2937          * immediate termination of the rports
2938          */
2939         spin_lock_irqsave(shost->host_lock, flags);
2940         if (rport->flags & FC_RPORT_DEVLOSS_PENDING) {
2941                 spin_unlock_irqrestore(shost->host_lock, flags);
2942                 if (!cancel_delayed_work(&rport->fail_io_work))
2943                         fc_flush_devloss(shost);
2944                 if (!cancel_delayed_work(&rport->dev_loss_work))
2945                         fc_flush_devloss(shost);
2946                 cancel_work_sync(&rport->scan_work);
2947                 spin_lock_irqsave(shost->host_lock, flags);
2948                 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
2949         }
2950         spin_unlock_irqrestore(shost->host_lock, flags);
2951
2952         /* Delete SCSI target and sdevs */
2953         if (rport->scsi_target_id != -1)
2954                 fc_starget_delete(&rport->stgt_delete_work);
2955
2956         /*
2957          * Notify the driver that the rport is now dead. The LLDD will
2958          * also guarantee that any communication to the rport is terminated
2959          *
2960          * Avoid this call if we already called it when we preserved the
2961          * rport for the binding.
2962          */
2963         spin_lock_irqsave(shost->host_lock, flags);
2964         if (!(rport->flags & FC_RPORT_DEVLOSS_CALLBK_DONE) &&
2965             (i->f->dev_loss_tmo_callbk)) {
2966                 rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
2967                 do_callback = 1;
2968         }
2969         spin_unlock_irqrestore(shost->host_lock, flags);
2970
2971         if (do_callback)
2972                 i->f->dev_loss_tmo_callbk(rport);
2973
2974         fc_bsg_remove(rport->rqst_q);
2975
2976         transport_remove_device(dev);
2977         device_del(dev);
2978         transport_destroy_device(dev);
2979         scsi_host_put(shost);                   /* for fc_host->rport list */
2980         put_device(dev);                        /* for self-reference */
2981 }
2982
2983
2984 /**
2985  * fc_remote_port_create - allocates and creates a remote FC port.
2986  * @shost:      scsi host the remote port is connected to.
2987  * @channel:    Channel on shost port connected to.
2988  * @ids:        The world wide names, fc address, and FC4 port
2989  *              roles for the remote port.
2990  *
2991  * Allocates and creates the remoter port structure, including the
2992  * class and sysfs creation.
2993  *
2994  * Notes:
2995  *      This routine assumes no locks are held on entry.
2996  */
2997 static struct fc_rport *
2998 fc_remote_port_create(struct Scsi_Host *shost, int channel,
2999                       struct fc_rport_identifiers  *ids)
3000 {
3001         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3002         struct fc_internal *fci = to_fc_internal(shost->transportt);
3003         struct fc_rport *rport;
3004         struct device *dev;
3005         unsigned long flags;
3006         int error;
3007         size_t size;
3008
3009         size = (sizeof(struct fc_rport) + fci->f->dd_fcrport_size);
3010         rport = kzalloc(size, GFP_KERNEL);
3011         if (unlikely(!rport)) {
3012                 printk(KERN_ERR "%s: allocation failure\n", __func__);
3013                 return NULL;
3014         }
3015
3016         rport->maxframe_size = -1;
3017         rport->supported_classes = FC_COS_UNSPECIFIED;
3018         rport->dev_loss_tmo = fc_host->dev_loss_tmo;
3019         memcpy(&rport->node_name, &ids->node_name, sizeof(rport->node_name));
3020         memcpy(&rport->port_name, &ids->port_name, sizeof(rport->port_name));
3021         rport->port_id = ids->port_id;
3022         rport->roles = ids->roles;
3023         rport->port_state = FC_PORTSTATE_ONLINE;
3024         if (fci->f->dd_fcrport_size)
3025                 rport->dd_data = &rport[1];
3026         rport->channel = channel;
3027         rport->fast_io_fail_tmo = -1;
3028
3029         INIT_DELAYED_WORK(&rport->dev_loss_work, fc_timeout_deleted_rport);
3030         INIT_DELAYED_WORK(&rport->fail_io_work, fc_timeout_fail_rport_io);
3031         INIT_WORK(&rport->scan_work, fc_scsi_scan_rport);
3032         INIT_WORK(&rport->stgt_delete_work, fc_starget_delete);
3033         INIT_WORK(&rport->rport_delete_work, fc_rport_final_delete);
3034
3035         spin_lock_irqsave(shost->host_lock, flags);
3036
3037         rport->number = fc_host->next_rport_number++;
3038         if ((rport->roles & FC_PORT_ROLE_FCP_TARGET) ||
3039             (rport->roles & FC_PORT_ROLE_FCP_DUMMY_INITIATOR))
3040                 rport->scsi_target_id = fc_host->next_target_id++;
3041         else
3042                 rport->scsi_target_id = -1;
3043         list_add_tail(&rport->peers, &fc_host->rports);
3044         scsi_host_get(shost);                   /* for fc_host->rport list */
3045
3046         spin_unlock_irqrestore(shost->host_lock, flags);
3047
3048         dev = &rport->dev;
3049         device_initialize(dev);                 /* takes self reference */
3050         dev->parent = get_device(&shost->shost_gendev); /* parent reference */
3051         dev->release = fc_rport_dev_release;
3052         dev_set_name(dev, "rport-%d:%d-%d",
3053                      shost->host_no, channel, rport->number);
3054         transport_setup_device(dev);
3055
3056         error = device_add(dev);
3057         if (error) {
3058                 printk(KERN_ERR "FC Remote Port device_add failed\n");
3059                 goto delete_rport;
3060         }
3061         transport_add_device(dev);
3062         transport_configure_device(dev);
3063
3064         fc_bsg_rportadd(shost, rport);
3065         /* ignore any bsg add error - we just can't do sgio */
3066
3067         if (rport->roles & FC_PORT_ROLE_FCP_TARGET) {
3068                 /* initiate a scan of the target */
3069                 rport->flags |= FC_RPORT_SCAN_PENDING;
3070                 scsi_queue_work(shost, &rport->scan_work);
3071         }
3072
3073         return rport;
3074
3075 delete_rport:
3076         transport_destroy_device(dev);
3077         spin_lock_irqsave(shost->host_lock, flags);
3078         list_del(&rport->peers);
3079         scsi_host_put(shost);                   /* for fc_host->rport list */
3080         spin_unlock_irqrestore(shost->host_lock, flags);
3081         put_device(dev->parent);
3082         kfree(rport);
3083         return NULL;
3084 }
3085
3086 /**
3087  * fc_remote_port_add - notify fc transport of the existence of a remote FC port.
3088  * @shost:      scsi host the remote port is connected to.
3089  * @channel:    Channel on shost port connected to.
3090  * @ids:        The world wide names, fc address, and FC4 port
3091  *              roles for the remote port.
3092  *
3093  * The LLDD calls this routine to notify the transport of the existence
3094  * of a remote port. The LLDD provides the unique identifiers (wwpn,wwn)
3095  * of the port, it's FC address (port_id), and the FC4 roles that are
3096  * active for the port.
3097  *
3098  * For ports that are FCP targets (aka scsi targets), the FC transport
3099  * maintains consistent target id bindings on behalf of the LLDD.
3100  * A consistent target id binding is an assignment of a target id to
3101  * a remote port identifier, which persists while the scsi host is
3102  * attached. The remote port can disappear, then later reappear, and
3103  * it's target id assignment remains the same. This allows for shifts
3104  * in FC addressing (if binding by wwpn or wwnn) with no apparent
3105  * changes to the scsi subsystem which is based on scsi host number and
3106  * target id values.  Bindings are only valid during the attachment of
3107  * the scsi host. If the host detaches, then later re-attaches, target
3108  * id bindings may change.
3109  *
3110  * This routine is responsible for returning a remote port structure.
3111  * The routine will search the list of remote ports it maintains
3112  * internally on behalf of consistent target id mappings. If found, the
3113  * remote port structure will be reused. Otherwise, a new remote port
3114  * structure will be allocated.
3115  *
3116  * Whenever a remote port is allocated, a new fc_remote_port class
3117  * device is created.
3118  *
3119  * Should not be called from interrupt context.
3120  *
3121  * Notes:
3122  *      This routine assumes no locks are held on entry.
3123  */
3124 struct fc_rport *
3125 fc_remote_port_add(struct Scsi_Host *shost, int channel,
3126         struct fc_rport_identifiers  *ids)
3127 {
3128         struct fc_internal *fci = to_fc_internal(shost->transportt);
3129         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3130         struct fc_rport *rport;
3131         unsigned long flags;
3132         int match = 0;
3133
3134         /* ensure any stgt delete functions are done */
3135         fc_flush_work(shost);
3136
3137         /*
3138          * Search the list of "active" rports, for an rport that has been
3139          * deleted, but we've held off the real delete while the target
3140          * is in a "blocked" state.
3141          */
3142         spin_lock_irqsave(shost->host_lock, flags);
3143
3144         list_for_each_entry(rport, &fc_host->rports, peers) {
3145
3146                 if ((rport->port_state == FC_PORTSTATE_BLOCKED ||
3147                      rport->port_state == FC_PORTSTATE_NOTPRESENT) &&
3148                         (rport->channel == channel)) {
3149
3150                         switch (fc_host->tgtid_bind_type) {
3151                         case FC_TGTID_BIND_BY_WWPN:
3152                         case FC_TGTID_BIND_NONE:
3153                                 if (rport->port_name == ids->port_name)
3154                                         match = 1;
3155                                 break;
3156                         case FC_TGTID_BIND_BY_WWNN:
3157                                 if (rport->node_name == ids->node_name)
3158                                         match = 1;
3159                                 break;
3160                         case FC_TGTID_BIND_BY_ID:
3161                                 if (rport->port_id == ids->port_id)
3162                                         match = 1;
3163                                 break;
3164                         }
3165
3166                         if (match) {
3167
3168                                 memcpy(&rport->node_name, &ids->node_name,
3169                                         sizeof(rport->node_name));
3170                                 memcpy(&rport->port_name, &ids->port_name,
3171                                         sizeof(rport->port_name));
3172                                 rport->port_id = ids->port_id;
3173
3174                                 rport->port_state = FC_PORTSTATE_ONLINE;
3175                                 rport->roles = ids->roles;
3176
3177                                 spin_unlock_irqrestore(shost->host_lock, flags);
3178
3179                                 if (fci->f->dd_fcrport_size)
3180                                         memset(rport->dd_data, 0,
3181                                                 fci->f->dd_fcrport_size);
3182
3183                                 /*
3184                                  * If we were not a target, cancel the
3185                                  * io terminate and rport timers, and
3186                                  * we're done.
3187                                  *
3188                                  * If we were a target, but our new role
3189                                  * doesn't indicate a target, leave the
3190                                  * timers running expecting the role to
3191                                  * change as the target fully logs in. If
3192                                  * it doesn't, the target will be torn down.
3193                                  *
3194                                  * If we were a target, and our role shows
3195                                  * we're still a target, cancel the timers
3196                                  * and kick off a scan.
3197                                  */
3198
3199                                 /* was a target, not in roles */
3200                                 if ((rport->scsi_target_id != -1) &&
3201                                     (!(ids->roles & FC_PORT_ROLE_FCP_TARGET)))
3202                                         return rport;
3203
3204                                 /*
3205                                  * Stop the fail io and dev_loss timers.
3206                                  * If they flush, the port_state will
3207                                  * be checked and will NOOP the function.
3208                                  */
3209                                 if (!cancel_delayed_work(&rport->fail_io_work))
3210                                         fc_flush_devloss(shost);
3211                                 if (!cancel_delayed_work(&rport->dev_loss_work))
3212                                         fc_flush_devloss(shost);
3213
3214                                 spin_lock_irqsave(shost->host_lock, flags);
3215
3216                                 rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
3217                                                   FC_RPORT_DEVLOSS_PENDING |
3218                                                   FC_RPORT_DEVLOSS_CALLBK_DONE);
3219
3220                                 spin_unlock_irqrestore(shost->host_lock, flags);
3221
3222                                 /* if target, initiate a scan */
3223                                 if (rport->scsi_target_id != -1) {
3224                                         scsi_target_unblock(&rport->dev,
3225                                                             SDEV_RUNNING);
3226                                         spin_lock_irqsave(shost->host_lock,
3227                                                           flags);
3228                                         rport->flags |= FC_RPORT_SCAN_PENDING;
3229                                         scsi_queue_work(shost,
3230                                                         &rport->scan_work);
3231                                         spin_unlock_irqrestore(shost->host_lock,
3232                                                         flags);
3233                                 }
3234
3235                                 fc_bsg_goose_queue(rport);
3236
3237                                 return rport;
3238                         }
3239                 }
3240         }
3241
3242         /*
3243          * Search the bindings array
3244          * Note: if never a FCP target, you won't be on this list
3245          */
3246         if (fc_host->tgtid_bind_type != FC_TGTID_BIND_NONE) {
3247
3248                 /* search for a matching consistent binding */
3249
3250                 list_for_each_entry(rport, &fc_host->rport_bindings,
3251                                         peers) {
3252                         if (rport->channel != channel)
3253                                 continue;
3254
3255                         switch (fc_host->tgtid_bind_type) {
3256                         case FC_TGTID_BIND_BY_WWPN:
3257                                 if (rport->port_name == ids->port_name)
3258                                         match = 1;
3259                                 break;
3260                         case FC_TGTID_BIND_BY_WWNN:
3261                                 if (rport->node_name == ids->node_name)
3262                                         match = 1;
3263                                 break;
3264                         case FC_TGTID_BIND_BY_ID:
3265                                 if (rport->port_id == ids->port_id)
3266                                         match = 1;
3267                                 break;
3268                         case FC_TGTID_BIND_NONE: /* to keep compiler happy */
3269                                 break;
3270                         }
3271
3272                         if (match) {
3273                                 list_move_tail(&rport->peers, &fc_host->rports);
3274                                 break;
3275                         }
3276                 }
3277
3278                 if (match) {
3279                         memcpy(&rport->node_name, &ids->node_name,
3280                                 sizeof(rport->node_name));
3281                         memcpy(&rport->port_name, &ids->port_name,
3282                                 sizeof(rport->port_name));
3283                         rport->port_id = ids->port_id;
3284                         rport->port_state = FC_PORTSTATE_ONLINE;
3285                         rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
3286
3287                         if (fci->f->dd_fcrport_size)
3288                                 memset(rport->dd_data, 0,
3289                                                 fci->f->dd_fcrport_size);
3290                         spin_unlock_irqrestore(shost->host_lock, flags);
3291
3292                         fc_remote_port_rolechg(rport, ids->roles);
3293                         return rport;
3294                 }
3295         }
3296
3297         spin_unlock_irqrestore(shost->host_lock, flags);
3298
3299         /* No consistent binding found - create new remote port entry */
3300         rport = fc_remote_port_create(shost, channel, ids);
3301
3302         return rport;
3303 }
3304 EXPORT_SYMBOL(fc_remote_port_add);
3305
3306
3307 /**
3308  * fc_remote_port_delete - notifies the fc transport that a remote port is no longer in existence.
3309  * @rport:      The remote port that no longer exists
3310  *
3311  * The LLDD calls this routine to notify the transport that a remote
3312  * port is no longer part of the topology. Note: Although a port
3313  * may no longer be part of the topology, it may persist in the remote
3314  * ports displayed by the fc_host. We do this under 2 conditions:
3315  *
3316  * 1) If the port was a scsi target, we delay its deletion by "blocking" it.
3317  *    This allows the port to temporarily disappear, then reappear without
3318  *    disrupting the SCSI device tree attached to it. During the "blocked"
3319  *    period the port will still exist.
3320  *
3321  * 2) If the port was a scsi target and disappears for longer than we
3322  *    expect, we'll delete the port and the tear down the SCSI device tree
3323  *    attached to it. However, we want to semi-persist the target id assigned
3324  *    to that port if it eventually does exist. The port structure will
3325  *    remain (although with minimal information) so that the target id
3326  *    bindings also remain.
3327  *
3328  * If the remote port is not an FCP Target, it will be fully torn down
3329  * and deallocated, including the fc_remote_port class device.
3330  *
3331  * If the remote port is an FCP Target, the port will be placed in a
3332  * temporary blocked state. From the LLDD's perspective, the rport no
3333  * longer exists. From the SCSI midlayer's perspective, the SCSI target
3334  * exists, but all sdevs on it are blocked from further I/O. The following
3335  * is then expected.
3336  *
3337  *   If the remote port does not return (signaled by a LLDD call to
3338  *   fc_remote_port_add()) within the dev_loss_tmo timeout, then the
3339  *   scsi target is removed - killing all outstanding i/o and removing the
3340  *   scsi devices attached to it. The port structure will be marked Not
3341  *   Present and be partially cleared, leaving only enough information to
3342  *   recognize the remote port relative to the scsi target id binding if
3343  *   it later appears.  The port will remain as long as there is a valid
3344  *   binding (e.g. until the user changes the binding type or unloads the
3345  *   scsi host with the binding).
3346  *
3347  *   If the remote port returns within the dev_loss_tmo value (and matches
3348  *   according to the target id binding type), the port structure will be
3349  *   reused. If it is no longer a SCSI target, the target will be torn
3350  *   down. If it continues to be a SCSI target, then the target will be
3351  *   unblocked (allowing i/o to be resumed), and a scan will be activated
3352  *   to ensure that all luns are detected.
3353  *
3354  * Called from normal process context only - cannot be called from interrupt.
3355  *
3356  * Notes:
3357  *      This routine assumes no locks are held on entry.
3358  */
3359 void
3360 fc_remote_port_delete(struct fc_rport  *rport)
3361 {
3362         struct Scsi_Host *shost = rport_to_shost(rport);
3363         unsigned long timeout = rport->dev_loss_tmo;
3364         unsigned long flags;
3365
3366         /*
3367          * No need to flush the fc_host work_q's, as all adds are synchronous.
3368          *
3369          * We do need to reclaim the rport scan work element, so eventually
3370          * (in fc_rport_final_delete()) we'll flush the scsi host work_q if
3371          * there's still a scan pending.
3372          */
3373
3374         spin_lock_irqsave(shost->host_lock, flags);
3375
3376         if (rport->port_state != FC_PORTSTATE_ONLINE) {
3377                 spin_unlock_irqrestore(shost->host_lock, flags);
3378                 return;
3379         }
3380
3381         /*
3382          * In the past, we if this was not an FCP-Target, we would
3383          * unconditionally just jump to deleting the rport.
3384          * However, rports can be used as node containers by the LLDD,
3385          * and its not appropriate to just terminate the rport at the
3386          * first sign of a loss in connectivity. The LLDD may want to
3387          * send ELS traffic to re-validate the login. If the rport is
3388          * immediately deleted, it makes it inappropriate for a node
3389          * container.
3390          * So... we now unconditionally wait dev_loss_tmo before
3391          * destroying an rport.
3392          */
3393
3394         rport->port_state = FC_PORTSTATE_BLOCKED;
3395
3396         rport->flags |= FC_RPORT_DEVLOSS_PENDING;
3397
3398         spin_unlock_irqrestore(shost->host_lock, flags);
3399
3400         scsi_target_block(&rport->dev);
3401
3402         /* see if we need to kill io faster than waiting for device loss */
3403         if ((rport->fast_io_fail_tmo != -1) &&
3404             (rport->fast_io_fail_tmo < timeout))
3405                 fc_queue_devloss_work(shost, &rport->fail_io_work,
3406                                         rport->fast_io_fail_tmo * HZ);
3407
3408         /* cap the length the devices can be blocked until they are deleted */
3409         fc_queue_devloss_work(shost, &rport->dev_loss_work, timeout * HZ);
3410 }
3411 EXPORT_SYMBOL(fc_remote_port_delete);
3412
3413 /**
3414  * fc_remote_port_rolechg - notifies the fc transport that the roles on a remote may have changed.
3415  * @rport:      The remote port that changed.
3416  * @roles:      New roles for this port.
3417  *
3418  * Description: The LLDD calls this routine to notify the transport that the
3419  * roles on a remote port may have changed. The largest effect of this is
3420  * if a port now becomes a FCP Target, it must be allocated a
3421  * scsi target id.  If the port is no longer a FCP target, any
3422  * scsi target id value assigned to it will persist in case the
3423  * role changes back to include FCP Target. No changes in the scsi
3424  * midlayer will be invoked if the role changes (in the expectation
3425  * that the role will be resumed. If it doesn't normal error processing
3426  * will take place).
3427  *
3428  * Should not be called from interrupt context.
3429  *
3430  * Notes:
3431  *      This routine assumes no locks are held on entry.
3432  */
3433 void
3434 fc_remote_port_rolechg(struct fc_rport  *rport, u32 roles)
3435 {
3436         struct Scsi_Host *shost = rport_to_shost(rport);
3437         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3438         unsigned long flags;
3439         int create = 0;
3440
3441         spin_lock_irqsave(shost->host_lock, flags);
3442         if (roles & FC_PORT_ROLE_FCP_TARGET) {
3443                 if (rport->scsi_target_id == -1) {
3444                         rport->scsi_target_id = fc_host->next_target_id++;
3445                         create = 1;
3446                 } else if (!(rport->roles & FC_PORT_ROLE_FCP_TARGET))
3447                         create = 1;
3448         }
3449
3450         rport->roles = roles;
3451
3452         spin_unlock_irqrestore(shost->host_lock, flags);
3453
3454         if (create) {
3455                 /*
3456                  * There may have been a delete timer running on the
3457                  * port. Ensure that it is cancelled as we now know
3458                  * the port is an FCP Target.
3459                  * Note: we know the rport exists and is in an online
3460                  *  state as the LLDD would not have had an rport
3461                  *  reference to pass us.
3462                  *
3463                  * Take no action on the del_timer failure as the state
3464                  * machine state change will validate the
3465                  * transaction.
3466                  */
3467                 if (!cancel_delayed_work(&rport->fail_io_work))
3468                         fc_flush_devloss(shost);
3469                 if (!cancel_delayed_work(&rport->dev_loss_work))
3470                         fc_flush_devloss(shost);
3471
3472                 spin_lock_irqsave(shost->host_lock, flags);
3473                 rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
3474                                   FC_RPORT_DEVLOSS_PENDING |
3475                                   FC_RPORT_DEVLOSS_CALLBK_DONE);
3476                 spin_unlock_irqrestore(shost->host_lock, flags);
3477
3478                 /* ensure any stgt delete functions are done */
3479                 fc_flush_work(shost);
3480
3481                 scsi_target_unblock(&rport->dev, SDEV_RUNNING);
3482                 /* initiate a scan of the target */
3483                 spin_lock_irqsave(shost->host_lock, flags);
3484                 rport->flags |= FC_RPORT_SCAN_PENDING;
3485                 scsi_queue_work(shost, &rport->scan_work);
3486                 spin_unlock_irqrestore(shost->host_lock, flags);
3487         }
3488 }
3489 EXPORT_SYMBOL(fc_remote_port_rolechg);
3490
3491 /**
3492  * fc_timeout_deleted_rport - Timeout handler for a deleted remote port.
3493  * @work:       rport target that failed to reappear in the allotted time.
3494  *
3495  * Description: An attempt to delete a remote port blocks, and if it fails
3496  *              to return in the allotted time this gets called.
3497  */
3498 static void
3499 fc_timeout_deleted_rport(struct work_struct *work)
3500 {
3501         struct fc_rport *rport =
3502                 container_of(work, struct fc_rport, dev_loss_work.work);
3503         struct Scsi_Host *shost = rport_to_shost(rport);
3504         struct fc_internal *i = to_fc_internal(shost->transportt);
3505         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3506         unsigned long flags;
3507         int do_callback = 0;
3508
3509         spin_lock_irqsave(shost->host_lock, flags);
3510
3511         rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
3512
3513         /*
3514          * If the port is ONLINE, then it came back. If it was a SCSI
3515          * target, validate it still is. If not, tear down the
3516          * scsi_target on it.
3517          */
3518         if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
3519             (rport->scsi_target_id != -1) &&
3520             !(rport->roles & FC_PORT_ROLE_FCP_TARGET)) {
3521                 dev_printk(KERN_ERR, &rport->dev,
3522                         "blocked FC remote port time out: no longer"
3523                         " a FCP target, removing starget\n");
3524                 spin_unlock_irqrestore(shost->host_lock, flags);
3525                 scsi_target_unblock(&rport->dev, SDEV_TRANSPORT_OFFLINE);
3526                 fc_queue_work(shost, &rport->stgt_delete_work);
3527                 return;
3528         }
3529
3530         /* NOOP state - we're flushing workq's */
3531         if (rport->port_state != FC_PORTSTATE_BLOCKED) {
3532                 spin_unlock_irqrestore(shost->host_lock, flags);
3533                 dev_printk(KERN_ERR, &rport->dev,
3534                         "blocked FC remote port time out: leaving"
3535                         " rport%s alone\n",
3536                         (rport->scsi_target_id != -1) ?  " and starget" : "");
3537                 return;
3538         }
3539
3540         if ((fc_host->tgtid_bind_type == FC_TGTID_BIND_NONE) ||
3541             (rport->scsi_target_id == -1)) {
3542                 list_del(&rport->peers);
3543                 rport->port_state = FC_PORTSTATE_DELETED;
3544                 dev_printk(KERN_ERR, &rport->dev,
3545                         "blocked FC remote port time out: removing"
3546                         " rport%s\n",
3547                         (rport->scsi_target_id != -1) ?  " and starget" : "");
3548                 fc_queue_work(shost, &rport->rport_delete_work);
3549                 spin_unlock_irqrestore(shost->host_lock, flags);
3550                 return;
3551         }
3552
3553         dev_printk(KERN_ERR, &rport->dev,
3554                 "blocked FC remote port time out: removing target and "
3555                 "saving binding\n");
3556
3557         list_move_tail(&rport->peers, &fc_host->rport_bindings);
3558
3559         /*
3560          * Note: We do not remove or clear the hostdata area. This allows
3561          *   host-specific target data to persist along with the
3562          *   scsi_target_id. It's up to the host to manage it's hostdata area.
3563          */
3564
3565         /*
3566          * Reinitialize port attributes that may change if the port comes back.
3567          */
3568         rport->maxframe_size = -1;
3569         rport->supported_classes = FC_COS_UNSPECIFIED;
3570         rport->roles = FC_PORT_ROLE_UNKNOWN;
3571         rport->port_state = FC_PORTSTATE_NOTPRESENT;
3572         rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
3573
3574         /*
3575          * Pre-emptively kill I/O rather than waiting for the work queue
3576          * item to teardown the starget. (FCOE libFC folks prefer this
3577          * and to have the rport_port_id still set when it's done).
3578          */
3579         spin_unlock_irqrestore(shost->host_lock, flags);
3580         fc_terminate_rport_io(rport);
3581
3582         spin_lock_irqsave(shost->host_lock, flags);
3583
3584         if (rport->port_state == FC_PORTSTATE_NOTPRESENT) {     /* still missing */
3585
3586                 /* remove the identifiers that aren't used in the consisting binding */
3587                 switch (fc_host->tgtid_bind_type) {
3588                 case FC_TGTID_BIND_BY_WWPN:
3589                         rport->node_name = -1;
3590                         rport->port_id = -1;
3591                         break;
3592                 case FC_TGTID_BIND_BY_WWNN:
3593                         rport->port_name = -1;
3594                         rport->port_id = -1;
3595                         break;
3596                 case FC_TGTID_BIND_BY_ID:
3597                         rport->node_name = -1;
3598                         rport->port_name = -1;
3599                         break;
3600                 case FC_TGTID_BIND_NONE:        /* to keep compiler happy */
3601                         break;
3602                 }
3603
3604                 /*
3605                  * As this only occurs if the remote port (scsi target)
3606                  * went away and didn't come back - we'll remove
3607                  * all attached scsi devices.
3608                  */
3609                 rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
3610                 fc_queue_work(shost, &rport->stgt_delete_work);
3611
3612                 do_callback = 1;
3613         }
3614
3615         spin_unlock_irqrestore(shost->host_lock, flags);
3616
3617         /*
3618          * Notify the driver that the rport is now dead. The LLDD will
3619          * also guarantee that any communication to the rport is terminated
3620          *
3621          * Note: we set the CALLBK_DONE flag above to correspond
3622          */
3623         if (do_callback && i->f->dev_loss_tmo_callbk)
3624                 i->f->dev_loss_tmo_callbk(rport);
3625 }
3626
3627
3628 /**
3629  * fc_timeout_fail_rport_io - Timeout handler for a fast io failing on a disconnected SCSI target.
3630  * @work:       rport to terminate io on.
3631  *
3632  * Notes: Only requests the failure of the io, not that all are flushed
3633  *    prior to returning.
3634  */
3635 static void
3636 fc_timeout_fail_rport_io(struct work_struct *work)
3637 {
3638         struct fc_rport *rport =
3639                 container_of(work, struct fc_rport, fail_io_work.work);
3640
3641         if (rport->port_state != FC_PORTSTATE_BLOCKED)
3642                 return;
3643
3644         rport->flags |= FC_RPORT_FAST_FAIL_TIMEDOUT;
3645         fc_terminate_rport_io(rport);
3646 }
3647
3648 /**
3649  * fc_scsi_scan_rport - called to perform a scsi scan on a remote port.
3650  * @work:       remote port to be scanned.
3651  */
3652 static void
3653 fc_scsi_scan_rport(struct work_struct *work)
3654 {
3655         struct fc_rport *rport =
3656                 container_of(work, struct fc_rport, scan_work);
3657         struct Scsi_Host *shost = rport_to_shost(rport);
3658         struct fc_internal *i = to_fc_internal(shost->transportt);
3659         unsigned long flags;
3660
3661         if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
3662             (rport->roles & FC_PORT_ROLE_FCP_TARGET) &&
3663             !(i->f->disable_target_scan)) {
3664                 scsi_scan_target(&rport->dev, rport->channel,
3665                                  rport->scsi_target_id, SCAN_WILD_CARD,
3666                                  SCSI_SCAN_RESCAN);
3667         }
3668
3669         spin_lock_irqsave(shost->host_lock, flags);
3670         rport->flags &= ~FC_RPORT_SCAN_PENDING;
3671         spin_unlock_irqrestore(shost->host_lock, flags);
3672 }
3673
3674 /**
3675  * fc_block_rport() - Block SCSI eh thread for blocked fc_rport.
3676  * @rport: Remote port that scsi_eh is trying to recover.
3677  *
3678  * This routine can be called from a FC LLD scsi_eh callback. It
3679  * blocks the scsi_eh thread until the fc_rport leaves the
3680  * FC_PORTSTATE_BLOCKED, or the fast_io_fail_tmo fires. This is
3681  * necessary to avoid the scsi_eh failing recovery actions for blocked
3682  * rports which would lead to offlined SCSI devices.
3683  *
3684  * Returns: 0 if the fc_rport left the state FC_PORTSTATE_BLOCKED.
3685  *          FAST_IO_FAIL if the fast_io_fail_tmo fired, this should be
3686  *          passed back to scsi_eh.
3687  */
3688 int fc_block_rport(struct fc_rport *rport)
3689 {
3690         struct Scsi_Host *shost = rport_to_shost(rport);
3691         unsigned long flags;
3692
3693         spin_lock_irqsave(shost->host_lock, flags);
3694         while (rport->port_state == FC_PORTSTATE_BLOCKED &&
3695                !(rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT)) {
3696                 spin_unlock_irqrestore(shost->host_lock, flags);
3697                 msleep(1000);
3698                 spin_lock_irqsave(shost->host_lock, flags);
3699         }
3700         spin_unlock_irqrestore(shost->host_lock, flags);
3701
3702         if (rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT)
3703                 return FAST_IO_FAIL;
3704
3705         return 0;
3706 }
3707 EXPORT_SYMBOL(fc_block_rport);
3708
3709 /**
3710  * fc_block_scsi_eh - Block SCSI eh thread for blocked fc_rport
3711  * @cmnd: SCSI command that scsi_eh is trying to recover
3712  *
3713  * This routine can be called from a FC LLD scsi_eh callback. It
3714  * blocks the scsi_eh thread until the fc_rport leaves the
3715  * FC_PORTSTATE_BLOCKED, or the fast_io_fail_tmo fires. This is
3716  * necessary to avoid the scsi_eh failing recovery actions for blocked
3717  * rports which would lead to offlined SCSI devices.
3718  *
3719  * Returns: 0 if the fc_rport left the state FC_PORTSTATE_BLOCKED.
3720  *          FAST_IO_FAIL if the fast_io_fail_tmo fired, this should be
3721  *          passed back to scsi_eh.
3722  */
3723 int fc_block_scsi_eh(struct scsi_cmnd *cmnd)
3724 {
3725         struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
3726
3727         if (WARN_ON_ONCE(!rport))
3728                 return FAST_IO_FAIL;
3729
3730         return fc_block_rport(rport);
3731 }
3732 EXPORT_SYMBOL(fc_block_scsi_eh);
3733
3734 /**
3735  * fc_vport_setup - allocates and creates a FC virtual port.
3736  * @shost:      scsi host the virtual port is connected to.
3737  * @channel:    Channel on shost port connected to.
3738  * @pdev:       parent device for vport
3739  * @ids:        The world wide names, FC4 port roles, etc for
3740  *              the virtual port.
3741  * @ret_vport:  The pointer to the created vport.
3742  *
3743  * Allocates and creates the vport structure, calls the parent host
3744  * to instantiate the vport, this completes w/ class and sysfs creation.
3745  *
3746  * Notes:
3747  *      This routine assumes no locks are held on entry.
3748  */
3749 static int
3750 fc_vport_setup(struct Scsi_Host *shost, int channel, struct device *pdev,
3751         struct fc_vport_identifiers  *ids, struct fc_vport **ret_vport)
3752 {
3753         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3754         struct fc_internal *fci = to_fc_internal(shost->transportt);
3755         struct fc_vport *vport;
3756         struct device *dev;
3757         unsigned long flags;
3758         size_t size;
3759         int error;
3760
3761         *ret_vport = NULL;
3762
3763         if ( ! fci->f->vport_create)
3764                 return -ENOENT;
3765
3766         size = (sizeof(struct fc_vport) + fci->f->dd_fcvport_size);
3767         vport = kzalloc(size, GFP_KERNEL);
3768         if (unlikely(!vport)) {
3769                 printk(KERN_ERR "%s: allocation failure\n", __func__);
3770                 return -ENOMEM;
3771         }
3772
3773         vport->vport_state = FC_VPORT_UNKNOWN;
3774         vport->vport_last_state = FC_VPORT_UNKNOWN;
3775         vport->node_name = ids->node_name;
3776         vport->port_name = ids->port_name;
3777         vport->roles = ids->roles;
3778         vport->vport_type = ids->vport_type;
3779         if (fci->f->dd_fcvport_size)
3780                 vport->dd_data = &vport[1];
3781         vport->shost = shost;
3782         vport->channel = channel;
3783         vport->flags = FC_VPORT_CREATING;
3784         INIT_WORK(&vport->vport_delete_work, fc_vport_sched_delete);
3785
3786         spin_lock_irqsave(shost->host_lock, flags);
3787
3788         if (fc_host->npiv_vports_inuse >= fc_host->max_npiv_vports) {
3789                 spin_unlock_irqrestore(shost->host_lock, flags);
3790                 kfree(vport);
3791                 return -ENOSPC;
3792         }
3793         fc_host->npiv_vports_inuse++;
3794         vport->number = fc_host->next_vport_number++;
3795         list_add_tail(&vport->peers, &fc_host->vports);
3796         scsi_host_get(shost);                   /* for fc_host->vport list */
3797
3798         spin_unlock_irqrestore(shost->host_lock, flags);
3799
3800         dev = &vport->dev;
3801         device_initialize(dev);                 /* takes self reference */
3802         dev->parent = get_device(pdev);         /* takes parent reference */
3803         dev->release = fc_vport_dev_release;
3804         dev_set_name(dev, "vport-%d:%d-%d",
3805                      shost->host_no, channel, vport->number);
3806         transport_setup_device(dev);
3807
3808         error = device_add(dev);
3809         if (error) {
3810                 printk(KERN_ERR "FC Virtual Port device_add failed\n");
3811                 goto delete_vport;
3812         }
3813         transport_add_device(dev);
3814         transport_configure_device(dev);
3815
3816         error = fci->f->vport_create(vport, ids->disable);
3817         if (error) {
3818                 printk(KERN_ERR "FC Virtual Port LLDD Create failed\n");
3819                 goto delete_vport_all;
3820         }
3821
3822         /*
3823          * if the parent isn't the physical adapter's Scsi_Host, ensure
3824          * the Scsi_Host at least contains a symlink to the vport.
3825          */
3826         if (pdev != &shost->shost_gendev) {
3827                 error = sysfs_create_link(&shost->shost_gendev.kobj,
3828                                  &dev->kobj, dev_name(dev));
3829                 if (error)
3830                         printk(KERN_ERR
3831                                 "%s: Cannot create vport symlinks for "
3832                                 "%s, err=%d\n",
3833                                 __func__, dev_name(dev), error);
3834         }
3835         spin_lock_irqsave(shost->host_lock, flags);
3836         vport->flags &= ~FC_VPORT_CREATING;
3837         spin_unlock_irqrestore(shost->host_lock, flags);
3838
3839         dev_printk(KERN_NOTICE, pdev,
3840                         "%s created via shost%d channel %d\n", dev_name(dev),
3841                         shost->host_no, channel);
3842
3843         *ret_vport = vport;
3844
3845         return 0;
3846
3847 delete_vport_all:
3848         transport_remove_device(dev);
3849         device_del(dev);
3850 delete_vport:
3851         transport_destroy_device(dev);
3852         spin_lock_irqsave(shost->host_lock, flags);
3853         list_del(&vport->peers);
3854         scsi_host_put(shost);                   /* for fc_host->vport list */
3855         fc_host->npiv_vports_inuse--;
3856         spin_unlock_irqrestore(shost->host_lock, flags);
3857         put_device(dev->parent);
3858         kfree(vport);
3859
3860         return error;
3861 }
3862
3863 /**
3864  * fc_vport_create - Admin App or LLDD requests creation of a vport
3865  * @shost:      scsi host the virtual port is connected to.
3866  * @channel:    channel on shost port connected to.
3867  * @ids:        The world wide names, FC4 port roles, etc for
3868  *              the virtual port.
3869  *
3870  * Notes:
3871  *      This routine assumes no locks are held on entry.
3872  */
3873 struct fc_vport *
3874 fc_vport_create(struct Scsi_Host *shost, int channel,
3875         struct fc_vport_identifiers *ids)
3876 {
3877         int stat;
3878         struct fc_vport *vport;
3879
3880         stat = fc_vport_setup(shost, channel, &shost->shost_gendev,
3881                  ids, &vport);
3882         return stat ? NULL : vport;
3883 }
3884 EXPORT_SYMBOL(fc_vport_create);
3885
3886 /**
3887  * fc_vport_terminate - Admin App or LLDD requests termination of a vport
3888  * @vport:      fc_vport to be terminated
3889  *
3890  * Calls the LLDD vport_delete() function, then deallocates and removes
3891  * the vport from the shost and object tree.
3892  *
3893  * Notes:
3894  *      This routine assumes no locks are held on entry.
3895  */
3896 int
3897 fc_vport_terminate(struct fc_vport *vport)
3898 {
3899         struct Scsi_Host *shost = vport_to_shost(vport);
3900         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3901         struct fc_internal *i = to_fc_internal(shost->transportt);
3902         struct device *dev = &vport->dev;
3903         unsigned long flags;
3904         int stat;
3905
3906         if (i->f->vport_delete)
3907                 stat = i->f->vport_delete(vport);
3908         else
3909                 stat = -ENOENT;
3910
3911         spin_lock_irqsave(shost->host_lock, flags);
3912         vport->flags &= ~FC_VPORT_DELETING;
3913         if (!stat) {
3914                 vport->flags |= FC_VPORT_DELETED;
3915                 list_del(&vport->peers);
3916                 fc_host->npiv_vports_inuse--;
3917                 scsi_host_put(shost);           /* for fc_host->vport list */
3918         }
3919         spin_unlock_irqrestore(shost->host_lock, flags);
3920
3921         if (stat)
3922                 return stat;
3923
3924         if (dev->parent != &shost->shost_gendev)
3925                 sysfs_remove_link(&shost->shost_gendev.kobj, dev_name(dev));
3926         transport_remove_device(dev);
3927         device_del(dev);
3928         transport_destroy_device(dev);
3929
3930         /*
3931          * Removing our self-reference should mean our
3932          * release function gets called, which will drop the remaining
3933          * parent reference and free the data structure.
3934          */
3935         put_device(dev);                        /* for self-reference */
3936
3937         return 0; /* SUCCESS */
3938 }
3939 EXPORT_SYMBOL(fc_vport_terminate);
3940
3941 /**
3942  * fc_vport_sched_delete - workq-based delete request for a vport
3943  * @work:       vport to be deleted.
3944  */
3945 static void
3946 fc_vport_sched_delete(struct work_struct *work)
3947 {
3948         struct fc_vport *vport =
3949                 container_of(work, struct fc_vport, vport_delete_work);
3950         int stat;
3951
3952         stat = fc_vport_terminate(vport);
3953         if (stat)
3954                 dev_printk(KERN_ERR, vport->dev.parent,
3955                         "%s: %s could not be deleted created via "
3956                         "shost%d channel %d - error %d\n", __func__,
3957                         dev_name(&vport->dev), vport->shost->host_no,
3958                         vport->channel, stat);
3959 }
3960
3961
3962 /*
3963  * BSG support
3964  */
3965
3966 /**
3967  * fc_bsg_job_timeout - handler for when a bsg request timesout
3968  * @req:        request that timed out
3969  */
3970 static enum blk_eh_timer_return
3971 fc_bsg_job_timeout(struct request *req)
3972 {
3973         struct bsg_job *job = blk_mq_rq_to_pdu(req);
3974         struct Scsi_Host *shost = fc_bsg_to_shost(job);
3975         struct fc_rport *rport = fc_bsg_to_rport(job);
3976         struct fc_internal *i = to_fc_internal(shost->transportt);
3977         int err = 0, inflight = 0;
3978
3979         if (rport && rport->port_state == FC_PORTSTATE_BLOCKED)
3980                 return BLK_EH_RESET_TIMER;
3981
3982         inflight = bsg_job_get(job);
3983
3984         if (inflight && i->f->bsg_timeout) {
3985                 /* call LLDD to abort the i/o as it has timed out */
3986                 err = i->f->bsg_timeout(job);
3987                 if (err == -EAGAIN) {
3988                         bsg_job_put(job);
3989                         return BLK_EH_RESET_TIMER;
3990                 } else if (err)
3991                         printk(KERN_ERR "ERROR: FC BSG request timeout - LLD "
3992                                 "abort failed with status %d\n", err);
3993         }
3994
3995         /* the blk_end_sync_io() doesn't check the error */
3996         if (inflight)
3997                 blk_mq_end_request(req, BLK_STS_IOERR);
3998         return BLK_EH_DONE;
3999 }
4000
4001 /**
4002  * fc_bsg_host_dispatch - process fc host bsg requests and dispatch to LLDD
4003  * @shost:      scsi host rport attached to
4004  * @job:        bsg job to be processed
4005  */
4006 static int fc_bsg_host_dispatch(struct Scsi_Host *shost, struct bsg_job *job)
4007 {
4008         struct fc_internal *i = to_fc_internal(shost->transportt);
4009         struct fc_bsg_request *bsg_request = job->request;
4010         struct fc_bsg_reply *bsg_reply = job->reply;
4011         int cmdlen = sizeof(uint32_t);  /* start with length of msgcode */
4012         int ret;
4013
4014         /* check if we really have all the request data needed */
4015         if (job->request_len < cmdlen) {
4016                 ret = -ENOMSG;
4017                 goto fail_host_msg;
4018         }
4019
4020         /* Validate the host command */
4021         switch (bsg_request->msgcode) {
4022         case FC_BSG_HST_ADD_RPORT:
4023                 cmdlen += sizeof(struct fc_bsg_host_add_rport);
4024                 break;
4025
4026         case FC_BSG_HST_DEL_RPORT:
4027                 cmdlen += sizeof(struct fc_bsg_host_del_rport);
4028                 break;
4029
4030         case FC_BSG_HST_ELS_NOLOGIN:
4031                 cmdlen += sizeof(struct fc_bsg_host_els);
4032                 /* there better be a xmt and rcv payloads */
4033                 if ((!job->request_payload.payload_len) ||
4034                     (!job->reply_payload.payload_len)) {
4035                         ret = -EINVAL;
4036                         goto fail_host_msg;
4037                 }
4038                 break;
4039
4040         case FC_BSG_HST_CT:
4041                 cmdlen += sizeof(struct fc_bsg_host_ct);
4042                 /* there better be xmt and rcv payloads */
4043                 if ((!job->request_payload.payload_len) ||
4044                     (!job->reply_payload.payload_len)) {
4045                         ret = -EINVAL;
4046                         goto fail_host_msg;
4047                 }
4048                 break;
4049
4050         case FC_BSG_HST_VENDOR:
4051                 cmdlen += sizeof(struct fc_bsg_host_vendor);
4052                 if ((shost->hostt->vendor_id == 0L) ||
4053                     (bsg_request->rqst_data.h_vendor.vendor_id !=
4054                         shost->hostt->vendor_id)) {
4055                         ret = -ESRCH;
4056                         goto fail_host_msg;
4057                 }
4058                 break;
4059
4060         default:
4061                 ret = -EBADR;
4062                 goto fail_host_msg;
4063         }
4064
4065         ret = i->f->bsg_request(job);
4066         if (!ret)
4067                 return 0;
4068
4069 fail_host_msg:
4070         /* return the errno failure code as the only status */
4071         BUG_ON(job->reply_len < sizeof(uint32_t));
4072         bsg_reply->reply_payload_rcv_len = 0;
4073         bsg_reply->result = ret;
4074         job->reply_len = sizeof(uint32_t);
4075         bsg_job_done(job, bsg_reply->result,
4076                        bsg_reply->reply_payload_rcv_len);
4077         return 0;
4078 }
4079
4080
4081 /*
4082  * fc_bsg_goose_queue - restart rport queue in case it was stopped
4083  * @rport:      rport to be restarted
4084  */
4085 static void
4086 fc_bsg_goose_queue(struct fc_rport *rport)
4087 {
4088         struct request_queue *q = rport->rqst_q;
4089
4090         if (q)
4091                 blk_mq_run_hw_queues(q, true);
4092 }
4093
4094 /**
4095  * fc_bsg_rport_dispatch - process rport bsg requests and dispatch to LLDD
4096  * @shost:      scsi host rport attached to
4097  * @job:        bsg job to be processed
4098  */
4099 static int fc_bsg_rport_dispatch(struct Scsi_Host *shost, struct bsg_job *job)
4100 {
4101         struct fc_internal *i = to_fc_internal(shost->transportt);
4102         struct fc_bsg_request *bsg_request = job->request;
4103         struct fc_bsg_reply *bsg_reply = job->reply;
4104         int cmdlen = sizeof(uint32_t);  /* start with length of msgcode */
4105         int ret;
4106
4107         /* check if we really have all the request data needed */
4108         if (job->request_len < cmdlen) {
4109                 ret = -ENOMSG;
4110                 goto fail_rport_msg;
4111         }
4112
4113         /* Validate the rport command */
4114         switch (bsg_request->msgcode) {
4115         case FC_BSG_RPT_ELS:
4116                 cmdlen += sizeof(struct fc_bsg_rport_els);
4117                 goto check_bidi;
4118
4119         case FC_BSG_RPT_CT:
4120                 cmdlen += sizeof(struct fc_bsg_rport_ct);
4121 check_bidi:
4122                 /* there better be xmt and rcv payloads */
4123                 if ((!job->request_payload.payload_len) ||
4124                     (!job->reply_payload.payload_len)) {
4125                         ret = -EINVAL;
4126                         goto fail_rport_msg;
4127                 }
4128                 break;
4129         default:
4130                 ret = -EBADR;
4131                 goto fail_rport_msg;
4132         }
4133
4134         ret = i->f->bsg_request(job);
4135         if (!ret)
4136                 return 0;
4137
4138 fail_rport_msg:
4139         /* return the errno failure code as the only status */
4140         BUG_ON(job->reply_len < sizeof(uint32_t));
4141         bsg_reply->reply_payload_rcv_len = 0;
4142         bsg_reply->result = ret;
4143         job->reply_len = sizeof(uint32_t);
4144         bsg_job_done(job, bsg_reply->result,
4145                        bsg_reply->reply_payload_rcv_len);
4146         return 0;
4147 }
4148
4149 static int fc_bsg_dispatch(struct bsg_job *job)
4150 {
4151         struct Scsi_Host *shost = fc_bsg_to_shost(job);
4152
4153         if (scsi_is_fc_rport(job->dev))
4154                 return fc_bsg_rport_dispatch(shost, job);
4155         else
4156                 return fc_bsg_host_dispatch(shost, job);
4157 }
4158
4159 static blk_status_t fc_bsg_rport_prep(struct fc_rport *rport)
4160 {
4161         if (rport->port_state == FC_PORTSTATE_BLOCKED &&
4162             !(rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT))
4163                 return BLK_STS_RESOURCE;
4164
4165         if (rport->port_state != FC_PORTSTATE_ONLINE)
4166                 return BLK_STS_IOERR;
4167
4168         return BLK_STS_OK;
4169 }
4170
4171
4172 static int fc_bsg_dispatch_prep(struct bsg_job *job)
4173 {
4174         struct fc_rport *rport = fc_bsg_to_rport(job);
4175         blk_status_t ret;
4176
4177         ret = fc_bsg_rport_prep(rport);
4178         switch (ret) {
4179         case BLK_STS_OK:
4180                 break;
4181         case BLK_STS_RESOURCE:
4182                 return -EAGAIN;
4183         default:
4184                 return -EIO;
4185         }
4186
4187         return fc_bsg_dispatch(job);
4188 }
4189
4190 /**
4191  * fc_bsg_hostadd - Create and add the bsg hooks so we can receive requests
4192  * @shost:      shost for fc_host
4193  * @fc_host:    fc_host adding the structures to
4194  */
4195 static int
4196 fc_bsg_hostadd(struct Scsi_Host *shost, struct fc_host_attrs *fc_host)
4197 {
4198         struct device *dev = &shost->shost_gendev;
4199         struct fc_internal *i = to_fc_internal(shost->transportt);
4200         struct request_queue *q;
4201         char bsg_name[20];
4202
4203         fc_host->rqst_q = NULL;
4204
4205         if (!i->f->bsg_request)
4206                 return -ENOTSUPP;
4207
4208         snprintf(bsg_name, sizeof(bsg_name),
4209                  "fc_host%d", shost->host_no);
4210
4211         q = bsg_setup_queue(dev, bsg_name, fc_bsg_dispatch, fc_bsg_job_timeout,
4212                                 i->f->dd_bsg_size);
4213         if (IS_ERR(q)) {
4214                 dev_err(dev,
4215                         "fc_host%d: bsg interface failed to initialize - setup queue\n",
4216                         shost->host_no);
4217                 return PTR_ERR(q);
4218         }
4219         __scsi_init_queue(shost, q);
4220         blk_queue_rq_timeout(q, FC_DEFAULT_BSG_TIMEOUT);
4221         fc_host->rqst_q = q;
4222         return 0;
4223 }
4224
4225 /**
4226  * fc_bsg_rportadd - Create and add the bsg hooks so we can receive requests
4227  * @shost:      shost that rport is attached to
4228  * @rport:      rport that the bsg hooks are being attached to
4229  */
4230 static int
4231 fc_bsg_rportadd(struct Scsi_Host *shost, struct fc_rport *rport)
4232 {
4233         struct device *dev = &rport->dev;
4234         struct fc_internal *i = to_fc_internal(shost->transportt);
4235         struct request_queue *q;
4236
4237         rport->rqst_q = NULL;
4238
4239         if (!i->f->bsg_request)
4240                 return -ENOTSUPP;
4241
4242         q = bsg_setup_queue(dev, dev_name(dev), fc_bsg_dispatch_prep,
4243                                 fc_bsg_job_timeout, i->f->dd_bsg_size);
4244         if (IS_ERR(q)) {
4245                 dev_err(dev, "failed to setup bsg queue\n");
4246                 return PTR_ERR(q);
4247         }
4248         __scsi_init_queue(shost, q);
4249         blk_queue_rq_timeout(q, BLK_DEFAULT_SG_TIMEOUT);
4250         rport->rqst_q = q;
4251         return 0;
4252 }
4253
4254
4255 /**
4256  * fc_bsg_remove - Deletes the bsg hooks on fchosts/rports
4257  * @q:  the request_queue that is to be torn down.
4258  *
4259  * Notes:
4260  *   Before unregistering the queue empty any requests that are blocked
4261  *
4262  *
4263  */
4264 static void
4265 fc_bsg_remove(struct request_queue *q)
4266 {
4267         bsg_remove_queue(q);
4268 }
4269
4270
4271 /* Original Author:  Martin Hicks */
4272 MODULE_AUTHOR("James Smart");
4273 MODULE_DESCRIPTION("FC Transport Attributes");
4274 MODULE_LICENSE("GPL");
4275
4276 module_init(fc_transport_init);
4277 module_exit(fc_transport_exit);