drivers/scsi/scsi_transport_fc.c

   1 /*
   2  *  FiberChannel transport specific attributes exported to sysfs.
   3  *
   4  *  Copyright (c) 2003 Silicon Graphics, Inc.  All rights reserved.
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  *  ========
  21  *
  22  *  Copyright (C) 2004-2007   James Smart, Emulex Corporation
  23  *    Rewrite for host, target, device, and remote port attributes,
  24  *    statistics, and service functions...
  25  *    Add vports, etc
  26  *
  27  */
  28 #include <linux/module.h>
  29 #include <linux/init.h>
  30 #include <linux/slab.h>
  31 #include <linux/delay.h>
  32 #include <linux/kernel.h>
  33 #include <linux/bsg-lib.h>
  34 #include <scsi/scsi_device.h>
  35 #include <scsi/scsi_host.h>
  36 #include <scsi/scsi_transport.h>
  37 #include <scsi/scsi_transport_fc.h>
  38 #include <scsi/scsi_cmnd.h>
  39 #include <net/netlink.h>
  40 #include <scsi/scsi_netlink_fc.h>
  41 #include <scsi/scsi_bsg_fc.h>
  42 #include "scsi_priv.h"
  43
  44 static int fc_queue_work(struct Scsi_Host *, struct work_struct *);
  45 static void fc_vport_sched_delete(struct work_struct *work);
  46 static int fc_vport_setup(struct Scsi_Host *shost, int channel,
  47         struct device *pdev, struct fc_vport_identifiers  *ids,
  48         struct fc_vport **vport);
  49 static int fc_bsg_hostadd(struct Scsi_Host *, struct fc_host_attrs *);
  50 static int fc_bsg_rportadd(struct Scsi_Host *, struct fc_rport *);
  51 static void fc_bsg_remove(struct request_queue *);
  52 static void fc_bsg_goose_queue(struct fc_rport *);
  53
  54 /*
  55  * Module Parameters
  56  */
  57
  58 /*
  59  * dev_loss_tmo: the default number of seconds that the FC transport
  60  *   should insulate the loss of a remote port.
  61  *   The maximum will be capped by the value of SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
  62  */
  63 static unsigned int fc_dev_loss_tmo = 60;               /* seconds */
  64
  65 module_param_named(dev_loss_tmo, fc_dev_loss_tmo, uint, S_IRUGO|S_IWUSR);
  66 MODULE_PARM_DESC(dev_loss_tmo,
  67                  "Maximum number of seconds that the FC transport should"
  68                  " insulate the loss of a remote port. Once this value is"
  69                  " exceeded, the scsi target is removed. Value should be"
  70                  " between 1 and SCSI_DEVICE_BLOCK_MAX_TIMEOUT if"
  71                  " fast_io_fail_tmo is not set.");
  72
  73 /*
  74  * Redefine so that we can have same named attributes in the
  75  * sdev/starget/host objects.
  76  */
  77 #define FC_DEVICE_ATTR(_prefix,_name,_mode,_show,_store)                \
  78 struct device_attribute device_attr_##_prefix##_##_name =       \
  79         __ATTR(_name,_mode,_show,_store)
  80
  81 #define fc_enum_name_search(title, table_type, table)                   \
  82 static const char *get_fc_##title##_name(enum table_type table_key)     \
  83 {                                                                       \
  84         int i;                                                          \
  85         char *name = NULL;                                              \
  86                                                                         \
  87         for (i = 0; i < ARRAY_SIZE(table); i++) {                       \
  88                 if (table[i].value == table_key) {                      \
  89                         name = table[i].name;                           \
  90                         break;                                          \
  91                 }                                                       \
  92         }                                                               \
  93         return name;                                                    \
  94 }
  95
  96 #define fc_enum_name_match(title, table_type, table)                    \
  97 static int get_fc_##title##_match(const char *table_key,                \
  98                 enum table_type *value)                                 \
  99 {                                                                       \
 100         int i;                                                          \
 101                                                                         \
 102         for (i = 0; i < ARRAY_SIZE(table); i++) {                       \
 103                 if (strncmp(table_key, table[i].name,                   \
 104                                 table[i].matchlen) == 0) {              \
 105                         *value = table[i].value;                        \
 106                         return 0; /* success */                         \
 107                 }                                                       \
 108         }                                                               \
 109         return 1; /* failure */                                         \
 110 }
 111
 112
 113 /* Convert fc_port_type values to ascii string name */
 114 static struct {
 115         enum fc_port_type       value;
 116         char                    *name;
 117 } fc_port_type_names[] = {
 118         { FC_PORTTYPE_UNKNOWN,          "Unknown" },
 119         { FC_PORTTYPE_OTHER,            "Other" },
 120         { FC_PORTTYPE_NOTPRESENT,       "Not Present" },
 121         { FC_PORTTYPE_NPORT,    "NPort (fabric via point-to-point)" },
 122         { FC_PORTTYPE_NLPORT,   "NLPort (fabric via loop)" },
 123         { FC_PORTTYPE_LPORT,    "LPort (private loop)" },
 124         { FC_PORTTYPE_PTP,      "Point-To-Point (direct nport connection)" },
 125         { FC_PORTTYPE_NPIV,             "NPIV VPORT" },
 126 };
 127 fc_enum_name_search(port_type, fc_port_type, fc_port_type_names)
 128 #define FC_PORTTYPE_MAX_NAMELEN         50
 129
 130 /* Reuse fc_port_type enum function for vport_type */
 131 #define get_fc_vport_type_name get_fc_port_type_name
 132
 133
 134 /* Convert fc_host_event_code values to ascii string name */
 135 static const struct {
 136         enum fc_host_event_code         value;
 137         char                            *name;
 138 } fc_host_event_code_names[] = {
 139         { FCH_EVT_LIP,                  "lip" },
 140         { FCH_EVT_LINKUP,               "link_up" },
 141         { FCH_EVT_LINKDOWN,             "link_down" },
 142         { FCH_EVT_LIPRESET,             "lip_reset" },
 143         { FCH_EVT_RSCN,                 "rscn" },
 144         { FCH_EVT_ADAPTER_CHANGE,       "adapter_chg" },
 145         { FCH_EVT_PORT_UNKNOWN,         "port_unknown" },
 146         { FCH_EVT_PORT_ONLINE,          "port_online" },
 147         { FCH_EVT_PORT_OFFLINE,         "port_offline" },
 148         { FCH_EVT_PORT_FABRIC,          "port_fabric" },
 149         { FCH_EVT_LINK_UNKNOWN,         "link_unknown" },
 150         { FCH_EVT_LINK_FPIN,            "link_FPIN" },
 151         { FCH_EVT_VENDOR_UNIQUE,        "vendor_unique" },
 152 };
 153 fc_enum_name_search(host_event_code, fc_host_event_code,
 154                 fc_host_event_code_names)
 155 #define FC_HOST_EVENT_CODE_MAX_NAMELEN  30
 156
 157
 158 /* Convert fc_port_state values to ascii string name */
 159 static struct {
 160         enum fc_port_state      value;
 161         char                    *name;
 162 } fc_port_state_names[] = {
 163         { FC_PORTSTATE_UNKNOWN,         "Unknown" },
 164         { FC_PORTSTATE_NOTPRESENT,      "Not Present" },
 165         { FC_PORTSTATE_ONLINE,          "Online" },
 166         { FC_PORTSTATE_OFFLINE,         "Offline" },
 167         { FC_PORTSTATE_BLOCKED,         "Blocked" },
 168         { FC_PORTSTATE_BYPASSED,        "Bypassed" },
 169         { FC_PORTSTATE_DIAGNOSTICS,     "Diagnostics" },
 170         { FC_PORTSTATE_LINKDOWN,        "Linkdown" },
 171         { FC_PORTSTATE_ERROR,           "Error" },
 172         { FC_PORTSTATE_LOOPBACK,        "Loopback" },
 173         { FC_PORTSTATE_DELETED,         "Deleted" },
 174 };
 175 fc_enum_name_search(port_state, fc_port_state, fc_port_state_names)
 176 #define FC_PORTSTATE_MAX_NAMELEN        20
 177
 178
 179 /* Convert fc_vport_state values to ascii string name */
 180 static struct {
 181         enum fc_vport_state     value;
 182         char                    *name;
 183 } fc_vport_state_names[] = {
 184         { FC_VPORT_UNKNOWN,             "Unknown" },
 185         { FC_VPORT_ACTIVE,              "Active" },
 186         { FC_VPORT_DISABLED,            "Disabled" },
 187         { FC_VPORT_LINKDOWN,            "Linkdown" },
 188         { FC_VPORT_INITIALIZING,        "Initializing" },
 189         { FC_VPORT_NO_FABRIC_SUPP,      "No Fabric Support" },
 190         { FC_VPORT_NO_FABRIC_RSCS,      "No Fabric Resources" },
 191         { FC_VPORT_FABRIC_LOGOUT,       "Fabric Logout" },
 192         { FC_VPORT_FABRIC_REJ_WWN,      "Fabric Rejected WWN" },
 193         { FC_VPORT_FAILED,              "VPort Failed" },
 194 };
 195 fc_enum_name_search(vport_state, fc_vport_state, fc_vport_state_names)
 196 #define FC_VPORTSTATE_MAX_NAMELEN       24
 197
 198 /* Reuse fc_vport_state enum function for vport_last_state */
 199 #define get_fc_vport_last_state_name get_fc_vport_state_name
 200
 201
 202 /* Convert fc_tgtid_binding_type values to ascii string name */
 203 static const struct {
 204         enum fc_tgtid_binding_type      value;
 205         char                            *name;
 206         int                             matchlen;
 207 } fc_tgtid_binding_type_names[] = {
 208         { FC_TGTID_BIND_NONE, "none", 4 },
 209         { FC_TGTID_BIND_BY_WWPN, "wwpn (World Wide Port Name)", 4 },
 210         { FC_TGTID_BIND_BY_WWNN, "wwnn (World Wide Node Name)", 4 },
 211         { FC_TGTID_BIND_BY_ID, "port_id (FC Address)", 7 },
 212 };
 213 fc_enum_name_search(tgtid_bind_type, fc_tgtid_binding_type,
 214                 fc_tgtid_binding_type_names)
 215 fc_enum_name_match(tgtid_bind_type, fc_tgtid_binding_type,
 216                 fc_tgtid_binding_type_names)
 217 #define FC_BINDTYPE_MAX_NAMELEN 30
 218
 219
 220 #define fc_bitfield_name_search(title, table)                   \
 221 static ssize_t                                                  \
 222 get_fc_##title##_names(u32 table_key, char *buf)                \
 223 {                                                               \
 224         char *prefix = "";                                      \
 225         ssize_t len = 0;                                        \
 226         int i;                                                  \
 227                                                                 \
 228         for (i = 0; i < ARRAY_SIZE(table); i++) {               \
 229                 if (table[i].value & table_key) {               \
 230                         len += sprintf(buf + len, "%s%s",       \
 231                                 prefix, table[i].name);         \
 232                         prefix = ", ";                          \
 233                 }                                               \
 234         }                                                       \
 235         len += sprintf(buf + len, "\n");                        \
 236         return len;                                             \
 237 }
 238
 239
 240 /* Convert FC_COS bit values to ascii string name */
 241 static const struct {
 242         u32                     value;
 243         char                    *name;
 244 } fc_cos_names[] = {
 245         { FC_COS_CLASS1,        "Class 1" },
 246         { FC_COS_CLASS2,        "Class 2" },
 247         { FC_COS_CLASS3,        "Class 3" },
 248         { FC_COS_CLASS4,        "Class 4" },
 249         { FC_COS_CLASS6,        "Class 6" },
 250 };
 251 fc_bitfield_name_search(cos, fc_cos_names)
 252
 253
 254 /* Convert FC_PORTSPEED bit values to ascii string name */
 255 static const struct {
 256         u32                     value;
 257         char                    *name;
 258 } fc_port_speed_names[] = {
 259         { FC_PORTSPEED_1GBIT,           "1 Gbit" },
 260         { FC_PORTSPEED_2GBIT,           "2 Gbit" },
 261         { FC_PORTSPEED_4GBIT,           "4 Gbit" },
 262         { FC_PORTSPEED_10GBIT,          "10 Gbit" },
 263         { FC_PORTSPEED_8GBIT,           "8 Gbit" },
 264         { FC_PORTSPEED_16GBIT,          "16 Gbit" },
 265         { FC_PORTSPEED_32GBIT,          "32 Gbit" },
 266         { FC_PORTSPEED_20GBIT,          "20 Gbit" },
 267         { FC_PORTSPEED_40GBIT,          "40 Gbit" },
 268         { FC_PORTSPEED_50GBIT,          "50 Gbit" },
 269         { FC_PORTSPEED_100GBIT,         "100 Gbit" },
 270         { FC_PORTSPEED_25GBIT,          "25 Gbit" },
 271         { FC_PORTSPEED_64GBIT,          "64 Gbit" },
 272         { FC_PORTSPEED_128GBIT,         "128 Gbit" },
 273         { FC_PORTSPEED_NOT_NEGOTIATED,  "Not Negotiated" },
 274 };
 275 fc_bitfield_name_search(port_speed, fc_port_speed_names)
 276
 277
 278 static int
 279 show_fc_fc4s (char *buf, u8 *fc4_list)
 280 {
 281         int i, len=0;
 282
 283         for (i = 0; i < FC_FC4_LIST_SIZE; i++, fc4_list++)
 284                 len += sprintf(buf + len , "0x%02x ", *fc4_list);
 285         len += sprintf(buf + len, "\n");
 286         return len;
 287 }
 288
 289
 290 /* Convert FC_PORT_ROLE bit values to ascii string name */
 291 static const struct {
 292         u32                     value;
 293         char                    *name;
 294 } fc_port_role_names[] = {
 295         { FC_PORT_ROLE_FCP_TARGET,              "FCP Target" },
 296         { FC_PORT_ROLE_FCP_INITIATOR,           "FCP Initiator" },
 297         { FC_PORT_ROLE_IP_PORT,                 "IP Port" },
 298         { FC_PORT_ROLE_FCP_DUMMY_INITIATOR,     "FCP Dummy Initiator" },
 299         { FC_PORT_ROLE_NVME_INITIATOR,          "NVMe Initiator" },
 300         { FC_PORT_ROLE_NVME_TARGET,             "NVMe Target" },
 301         { FC_PORT_ROLE_NVME_DISCOVERY,          "NVMe Discovery" },
 302 };
 303 fc_bitfield_name_search(port_roles, fc_port_role_names)
 304
 305 /*
 306  * Define roles that are specific to port_id. Values are relative to ROLE_MASK.
 307  */
 308 #define FC_WELLKNOWN_PORTID_MASK        0xfffff0
 309 #define FC_WELLKNOWN_ROLE_MASK          0x00000f
 310 #define FC_FPORT_PORTID                 0x00000e
 311 #define FC_FABCTLR_PORTID               0x00000d
 312 #define FC_DIRSRVR_PORTID               0x00000c
 313 #define FC_TIMESRVR_PORTID              0x00000b
 314 #define FC_MGMTSRVR_PORTID              0x00000a
 315
 316
 317 static void fc_timeout_deleted_rport(struct work_struct *work);
 318 static void fc_timeout_fail_rport_io(struct work_struct *work);
 319 static void fc_scsi_scan_rport(struct work_struct *work);
 320
 321 /*
 322  * Attribute counts pre object type...
 323  * Increase these values if you add attributes
 324  */
 325 #define FC_STARGET_NUM_ATTRS    3
 326 #define FC_RPORT_NUM_ATTRS      10
 327 #define FC_VPORT_NUM_ATTRS      9
 328 #define FC_HOST_NUM_ATTRS       29
 329
 330 struct fc_internal {
 331         struct scsi_transport_template t;
 332         struct fc_function_template *f;
 333
 334         /*
 335          * For attributes : each object has :
 336          *   An array of the actual attributes structures
 337          *   An array of null-terminated pointers to the attribute
 338          *     structures - used for mid-layer interaction.
 339          *
 340          * The attribute containers for the starget and host are are
 341          * part of the midlayer. As the remote port is specific to the
 342          * fc transport, we must provide the attribute container.
 343          */
 344         struct device_attribute private_starget_attrs[
 345                                                         FC_STARGET_NUM_ATTRS];
 346         struct device_attribute *starget_attrs[FC_STARGET_NUM_ATTRS + 1];
 347
 348         struct device_attribute private_host_attrs[FC_HOST_NUM_ATTRS];
 349         struct device_attribute *host_attrs[FC_HOST_NUM_ATTRS + 1];
 350
 351         struct transport_container rport_attr_cont;
 352         struct device_attribute private_rport_attrs[FC_RPORT_NUM_ATTRS];
 353         struct device_attribute *rport_attrs[FC_RPORT_NUM_ATTRS + 1];
 354
 355         struct transport_container vport_attr_cont;
 356         struct device_attribute private_vport_attrs[FC_VPORT_NUM_ATTRS];
 357         struct device_attribute *vport_attrs[FC_VPORT_NUM_ATTRS + 1];
 358 };
 359
 360 #define to_fc_internal(tmpl)    container_of(tmpl, struct fc_internal, t)
 361
 362 static int fc_target_setup(struct transport_container *tc, struct device *dev,
 363                            struct device *cdev)
 364 {
 365         struct scsi_target *starget = to_scsi_target(dev);
 366         struct fc_rport *rport = starget_to_rport(starget);
 367
 368         /*
 369          * if parent is remote port, use values from remote port.
 370          * Otherwise, this host uses the fc_transport, but not the
 371          * remote port interface. As such, initialize to known non-values.
 372          */
 373         if (rport) {
 374                 fc_starget_node_name(starget) = rport->node_name;
 375                 fc_starget_port_name(starget) = rport->port_name;
 376                 fc_starget_port_id(starget) = rport->port_id;
 377         } else {
 378                 fc_starget_node_name(starget) = -1;
 379                 fc_starget_port_name(starget) = -1;
 380                 fc_starget_port_id(starget) = -1;
 381         }
 382
 383         return 0;
 384 }
 385
 386 static DECLARE_TRANSPORT_CLASS(fc_transport_class,
 387                                "fc_transport",
 388                                fc_target_setup,
 389                                NULL,
 390                                NULL);
 391
 392 static int fc_host_setup(struct transport_container *tc, struct device *dev,
 393                          struct device *cdev)
 394 {
 395         struct Scsi_Host *shost = dev_to_shost(dev);
 396         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
 397
 398         /*
 399          * Set default values easily detected by the midlayer as
 400          * failure cases.  The scsi lldd is responsible for initializing
 401          * all transport attributes to valid values per host.
 402          */
 403         fc_host->node_name = -1;
 404         fc_host->port_name = -1;
 405         fc_host->permanent_port_name = -1;
 406         fc_host->supported_classes = FC_COS_UNSPECIFIED;
 407         memset(fc_host->supported_fc4s, 0,
 408                 sizeof(fc_host->supported_fc4s));
 409         fc_host->supported_speeds = FC_PORTSPEED_UNKNOWN;
 410         fc_host->maxframe_size = -1;
 411         fc_host->max_npiv_vports = 0;
 412         memset(fc_host->serial_number, 0,
 413                 sizeof(fc_host->serial_number));
 414         memset(fc_host->manufacturer, 0,
 415                 sizeof(fc_host->manufacturer));
 416         memset(fc_host->model, 0,
 417                 sizeof(fc_host->model));
 418         memset(fc_host->model_description, 0,
 419                 sizeof(fc_host->model_description));
 420         memset(fc_host->hardware_version, 0,
 421                 sizeof(fc_host->hardware_version));
 422         memset(fc_host->driver_version, 0,
 423                 sizeof(fc_host->driver_version));
 424         memset(fc_host->firmware_version, 0,
 425                 sizeof(fc_host->firmware_version));
 426         memset(fc_host->optionrom_version, 0,
 427                 sizeof(fc_host->optionrom_version));
 428
 429         fc_host->port_id = -1;
 430         fc_host->port_type = FC_PORTTYPE_UNKNOWN;
 431         fc_host->port_state = FC_PORTSTATE_UNKNOWN;
 432         memset(fc_host->active_fc4s, 0,
 433                 sizeof(fc_host->active_fc4s));
 434         fc_host->speed = FC_PORTSPEED_UNKNOWN;
 435         fc_host->fabric_name = -1;
 436         memset(fc_host->symbolic_name, 0, sizeof(fc_host->symbolic_name));
 437         memset(fc_host->system_hostname, 0, sizeof(fc_host->system_hostname));
 438
 439         fc_host->tgtid_bind_type = FC_TGTID_BIND_BY_WWPN;
 440
 441         INIT_LIST_HEAD(&fc_host->rports);
 442         INIT_LIST_HEAD(&fc_host->rport_bindings);
 443         INIT_LIST_HEAD(&fc_host->vports);
 444         fc_host->next_rport_number = 0;
 445         fc_host->next_target_id = 0;
 446         fc_host->next_vport_number = 0;
 447         fc_host->npiv_vports_inuse = 0;
 448
 449         snprintf(fc_host->work_q_name, sizeof(fc_host->work_q_name),
 450                  "fc_wq_%d", shost->host_no);
 451         fc_host->work_q = alloc_workqueue("%s", 0, 0, fc_host->work_q_name);
 452         if (!fc_host->work_q)
 453                 return -ENOMEM;
 454
 455         fc_host->dev_loss_tmo = fc_dev_loss_tmo;
 456         snprintf(fc_host->devloss_work_q_name,
 457                  sizeof(fc_host->devloss_work_q_name),
 458                  "fc_dl_%d", shost->host_no);
 459         fc_host->devloss_work_q = alloc_workqueue("%s", 0, 0,
 460                                         fc_host->devloss_work_q_name);
 461         if (!fc_host->devloss_work_q) {
 462                 destroy_workqueue(fc_host->work_q);
 463                 fc_host->work_q = NULL;
 464                 return -ENOMEM;
 465         }
 466
 467         fc_bsg_hostadd(shost, fc_host);
 468         /* ignore any bsg add error - we just can't do sgio */
 469
 470         return 0;
 471 }
 472
 473 static int fc_host_remove(struct transport_container *tc, struct device *dev,
 474                          struct device *cdev)
 475 {
 476         struct Scsi_Host *shost = dev_to_shost(dev);
 477         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
 478
 479         fc_bsg_remove(fc_host->rqst_q);
 480         return 0;
 481 }
 482
 483 static DECLARE_TRANSPORT_CLASS(fc_host_class,
 484                                "fc_host",
 485                                fc_host_setup,
 486                                fc_host_remove,
 487                                NULL);
 488
 489 /*
 490  * Setup and Remove actions for remote ports are handled
 491  * in the service functions below.
 492  */
 493 static DECLARE_TRANSPORT_CLASS(fc_rport_class,
 494                                "fc_remote_ports",
 495                                NULL,
 496                                NULL,
 497                                NULL);
 498
 499 /*
 500  * Setup and Remove actions for virtual ports are handled
 501  * in the service functions below.
 502  */
 503 static DECLARE_TRANSPORT_CLASS(fc_vport_class,
 504                                "fc_vports",
 505                                NULL,
 506                                NULL,
 507                                NULL);
 508
 509 /*
 510  * Netlink Infrastructure
 511  */
 512
 513 static atomic_t fc_event_seq;
 514
 515 /**
 516  * fc_get_event_number - Obtain the next sequential FC event number
 517  *
 518  * Notes:
 519  *   We could have inlined this, but it would have required fc_event_seq to
 520  *   be exposed. For now, live with the subroutine call.
 521  *   Atomic used to avoid lock/unlock...
 522  */
 523 u32
 524 fc_get_event_number(void)
 525 {
 526         return atomic_add_return(1, &fc_event_seq);
 527 }
 528 EXPORT_SYMBOL(fc_get_event_number);
 529
 530 /**
 531  * fc_host_post_fc_event - routine to do the work of posting an event
 532  *                      on an fc_host.
 533  * @shost:              host the event occurred on
 534  * @event_number:       fc event number obtained from get_fc_event_number()
 535  * @event_code:         fc_host event being posted
 536  * @data_len:           amount, in bytes, of event data
 537  * @data_buf:           pointer to event data
 538  * @vendor_id:          value for Vendor id
 539  *
 540  * Notes:
 541  *      This routine assumes no locks are held on entry.
 542  */
 543 void
 544 fc_host_post_fc_event(struct Scsi_Host *shost, u32 event_number,
 545                 enum fc_host_event_code event_code,
 546                 u32 data_len, char *data_buf, u64 vendor_id)
 547 {
 548         struct sk_buff *skb;
 549         struct nlmsghdr *nlh;
 550         struct fc_nl_event *event;
 551         const char *name;
 552         u32 len;
 553         int err;
 554
 555         if (!data_buf || data_len < 4)
 556                 data_len = 0;
 557
 558         if (!scsi_nl_sock) {
 559                 err = -ENOENT;
 560                 goto send_fail;
 561         }
 562
 563         len = FC_NL_MSGALIGN(sizeof(*event) + data_len);
 564
 565         skb = nlmsg_new(len, GFP_KERNEL);
 566         if (!skb) {
 567                 err = -ENOBUFS;
 568                 goto send_fail;
 569         }
 570
 571         nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG, len, 0);
 572         if (!nlh) {
 573                 err = -ENOBUFS;
 574                 goto send_fail_skb;
 575         }
 576         event = nlmsg_data(nlh);
 577
 578         INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
 579                                 FC_NL_ASYNC_EVENT, len);
 580         event->seconds = ktime_get_real_seconds();
 581         event->vendor_id = vendor_id;
 582         event->host_no = shost->host_no;
 583         event->event_datalen = data_len;        /* bytes */
 584         event->event_num = event_number;
 585         event->event_code = event_code;
 586         if (data_len)
 587                 memcpy(&event->event_data, data_buf, data_len);
 588
 589         nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
 590                         GFP_KERNEL);
 591         return;
 592
 593 send_fail_skb:
 594         kfree_skb(skb);
 595 send_fail:
 596         name = get_fc_host_event_code_name(event_code);
 597         printk(KERN_WARNING
 598                 "%s: Dropped Event : host %d %s data 0x%08x - err %d\n",
 599                 __func__, shost->host_no,
 600                 (name) ? name : "<unknown>",
 601                 (data_len) ? *((u32 *)data_buf) : 0xFFFFFFFF, err);
 602         return;
 603 }
 604 EXPORT_SYMBOL(fc_host_post_fc_event);
 605
 606 /**
 607  * fc_host_post_event - called to post an even on an fc_host.
 608  * @shost:              host the event occurred on
 609  * @event_number:       fc event number obtained from get_fc_event_number()
 610  * @event_code:         fc_host event being posted
 611  * @event_data:         32bits of data for the event being posted
 612  *
 613  * Notes:
 614  *      This routine assumes no locks are held on entry.
 615  */
 616 void
 617 fc_host_post_event(struct Scsi_Host *shost, u32 event_number,
 618                 enum fc_host_event_code event_code, u32 event_data)
 619 {
 620         fc_host_post_fc_event(shost, event_number, event_code,
 621                 (u32)sizeof(u32), (char *)&event_data, 0);
 622 }
 623 EXPORT_SYMBOL(fc_host_post_event);
 624
 625
 626 /**
 627  * fc_host_post_vendor_event - called to post a vendor unique event
 628  *                      on an fc_host
 629  * @shost:              host the event occurred on
 630  * @event_number:       fc event number obtained from get_fc_event_number()
 631  * @data_len:           amount, in bytes, of vendor unique data
 632  * @data_buf:           pointer to vendor unique data
 633  * @vendor_id:          Vendor id
 634  *
 635  * Notes:
 636  *      This routine assumes no locks are held on entry.
 637  */
 638 void
 639 fc_host_post_vendor_event(struct Scsi_Host *shost, u32 event_number,
 640                 u32 data_len, char * data_buf, u64 vendor_id)
 641 {
 642         fc_host_post_fc_event(shost, event_number, FCH_EVT_VENDOR_UNIQUE,
 643                 data_len, data_buf, vendor_id);
 644 }
 645 EXPORT_SYMBOL(fc_host_post_vendor_event);
 646
 647 /**
 648  * fc_host_rcv_fpin - routine to process a received FPIN.
 649  * @shost:              host the FPIN was received on
 650  * @fpin_len:           length of FPIN payload, in bytes
 651  * @fpin_buf:           pointer to FPIN payload
 652  *
 653  * Notes:
 654  *      This routine assumes no locks are held on entry.
 655  */
 656 void
 657 fc_host_fpin_rcv(struct Scsi_Host *shost, u32 fpin_len, char *fpin_buf)
 658 {
 659         fc_host_post_fc_event(shost, fc_get_event_number(),
 660                                 FCH_EVT_LINK_FPIN, fpin_len, fpin_buf, 0);
 661 }
 662 EXPORT_SYMBOL(fc_host_fpin_rcv);
 663
 664
 665 static __init int fc_transport_init(void)
 666 {
 667         int error;
 668
 669         atomic_set(&fc_event_seq, 0);
 670
 671         error = transport_class_register(&fc_host_class);
 672         if (error)
 673                 return error;
 674         error = transport_class_register(&fc_vport_class);
 675         if (error)
 676                 goto unreg_host_class;
 677         error = transport_class_register(&fc_rport_class);
 678         if (error)
 679                 goto unreg_vport_class;
 680         error = transport_class_register(&fc_transport_class);
 681         if (error)
 682                 goto unreg_rport_class;
 683         return 0;
 684
 685 unreg_rport_class:
 686         transport_class_unregister(&fc_rport_class);
 687 unreg_vport_class:
 688         transport_class_unregister(&fc_vport_class);
 689 unreg_host_class:
 690         transport_class_unregister(&fc_host_class);
 691         return error;
 692 }
 693
 694 static void __exit fc_transport_exit(void)
 695 {
 696         transport_class_unregister(&fc_transport_class);
 697         transport_class_unregister(&fc_rport_class);
 698         transport_class_unregister(&fc_host_class);
 699         transport_class_unregister(&fc_vport_class);
 700 }
 701
 702 /*
 703  * FC Remote Port Attribute Management
 704  */
 705
 706 #define fc_rport_show_function(field, format_string, sz, cast)          \
 707 static ssize_t                                                          \
 708 show_fc_rport_##field (struct device *dev,                              \
 709                        struct device_attribute *attr, char *buf)        \
 710 {                                                                       \
 711         struct fc_rport *rport = transport_class_to_rport(dev);         \
 712         struct Scsi_Host *shost = rport_to_shost(rport);                \
 713         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 714         if ((i->f->get_rport_##field) &&                                \
 715             !((rport->port_state == FC_PORTSTATE_BLOCKED) ||            \
 716               (rport->port_state == FC_PORTSTATE_DELETED) ||            \
 717               (rport->port_state == FC_PORTSTATE_NOTPRESENT)))          \
 718                 i->f->get_rport_##field(rport);                         \
 719         return snprintf(buf, sz, format_string, cast rport->field);     \
 720 }
 721
 722 #define fc_rport_store_function(field)                                  \
 723 static ssize_t                                                          \
 724 store_fc_rport_##field(struct device *dev,                              \
 725                        struct device_attribute *attr,                   \
 726                        const char *buf, size_t count)                   \
 727 {                                                                       \
 728         int val;                                                        \
 729         struct fc_rport *rport = transport_class_to_rport(dev);         \
 730         struct Scsi_Host *shost = rport_to_shost(rport);                \
 731         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 732         char *cp;                                                       \
 733         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||              \
 734             (rport->port_state == FC_PORTSTATE_DELETED) ||              \
 735             (rport->port_state == FC_PORTSTATE_NOTPRESENT))             \
 736                 return -EBUSY;                                          \
 737         val = simple_strtoul(buf, &cp, 0);                              \
 738         if (*cp && (*cp != '\n'))                                       \
 739                 return -EINVAL;                                         \
 740         i->f->set_rport_##field(rport, val);                            \
 741         return count;                                                   \
 742 }
 743
 744 #define fc_rport_rd_attr(field, format_string, sz)                      \
 745         fc_rport_show_function(field, format_string, sz, )              \
 746 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
 747                          show_fc_rport_##field, NULL)
 748
 749 #define fc_rport_rd_attr_cast(field, format_string, sz, cast)           \
 750         fc_rport_show_function(field, format_string, sz, (cast))        \
 751 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
 752                           show_fc_rport_##field, NULL)
 753
 754 #define fc_rport_rw_attr(field, format_string, sz)                      \
 755         fc_rport_show_function(field, format_string, sz, )              \
 756         fc_rport_store_function(field)                                  \
 757 static FC_DEVICE_ATTR(rport, field, S_IRUGO | S_IWUSR,          \
 758                         show_fc_rport_##field,                          \
 759                         store_fc_rport_##field)
 760
 761
 762 #define fc_private_rport_show_function(field, format_string, sz, cast)  \
 763 static ssize_t                                                          \
 764 show_fc_rport_##field (struct device *dev,                              \
 765                        struct device_attribute *attr, char *buf)        \
 766 {                                                                       \
 767         struct fc_rport *rport = transport_class_to_rport(dev);         \
 768         return snprintf(buf, sz, format_string, cast rport->field);     \
 769 }
 770
 771 #define fc_private_rport_rd_attr(field, format_string, sz)              \
 772         fc_private_rport_show_function(field, format_string, sz, )      \
 773 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
 774                          show_fc_rport_##field, NULL)
 775
 776 #define fc_private_rport_rd_attr_cast(field, format_string, sz, cast)   \
 777         fc_private_rport_show_function(field, format_string, sz, (cast)) \
 778 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
 779                           show_fc_rport_##field, NULL)
 780
 781
 782 #define fc_private_rport_rd_enum_attr(title, maxlen)                    \
 783 static ssize_t                                                          \
 784 show_fc_rport_##title (struct device *dev,                              \
 785                        struct device_attribute *attr, char *buf)        \
 786 {                                                                       \
 787         struct fc_rport *rport = transport_class_to_rport(dev);         \
 788         const char *name;                                               \
 789         name = get_fc_##title##_name(rport->title);                     \
 790         if (!name)                                                      \
 791                 return -EINVAL;                                         \
 792         return snprintf(buf, maxlen, "%s\n", name);                     \
 793 }                                                                       \
 794 static FC_DEVICE_ATTR(rport, title, S_IRUGO,                    \
 795                         show_fc_rport_##title, NULL)
 796
 797
 798 #define SETUP_RPORT_ATTRIBUTE_RD(field)                                 \
 799         i->private_rport_attrs[count] = device_attr_rport_##field; \
 800         i->private_rport_attrs[count].attr.mode = S_IRUGO;              \
 801         i->private_rport_attrs[count].store = NULL;                     \
 802         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 803         if (i->f->show_rport_##field)                                   \
 804                 count++
 805
 806 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(field)                         \
 807         i->private_rport_attrs[count] = device_attr_rport_##field; \
 808         i->private_rport_attrs[count].attr.mode = S_IRUGO;              \
 809         i->private_rport_attrs[count].store = NULL;                     \
 810         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 811         count++
 812
 813 #define SETUP_RPORT_ATTRIBUTE_RW(field)                                 \
 814         i->private_rport_attrs[count] = device_attr_rport_##field; \
 815         if (!i->f->set_rport_##field) {                                 \
 816                 i->private_rport_attrs[count].attr.mode = S_IRUGO;      \
 817                 i->private_rport_attrs[count].store = NULL;             \
 818         }                                                               \
 819         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 820         if (i->f->show_rport_##field)                                   \
 821                 count++
 822
 823 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(field)                         \
 824 {                                                                       \
 825         i->private_rport_attrs[count] = device_attr_rport_##field; \
 826         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 827         count++;                                                        \
 828 }
 829
 830
 831 /* The FC Transport Remote Port Attributes: */
 832
 833 /* Fixed Remote Port Attributes */
 834
 835 fc_private_rport_rd_attr(maxframe_size, "%u bytes\n", 20);
 836
 837 static ssize_t
 838 show_fc_rport_supported_classes (struct device *dev,
 839                                  struct device_attribute *attr, char *buf)
 840 {
 841         struct fc_rport *rport = transport_class_to_rport(dev);
 842         if (rport->supported_classes == FC_COS_UNSPECIFIED)
 843                 return snprintf(buf, 20, "unspecified\n");
 844         return get_fc_cos_names(rport->supported_classes, buf);
 845 }
 846 static FC_DEVICE_ATTR(rport, supported_classes, S_IRUGO,
 847                 show_fc_rport_supported_classes, NULL);
 848
 849 /* Dynamic Remote Port Attributes */
 850
 851 /*
 852  * dev_loss_tmo attribute
 853  */
 854 static int fc_str_to_dev_loss(const char *buf, unsigned long *val)
 855 {
 856         char *cp;
 857
 858         *val = simple_strtoul(buf, &cp, 0);
 859         if (*cp && (*cp != '\n'))
 860                 return -EINVAL;
 861         /*
 862          * Check for overflow; dev_loss_tmo is u32
 863          */
 864         if (*val > UINT_MAX)
 865                 return -EINVAL;
 866
 867         return 0;
 868 }
 869
 870 static int fc_rport_set_dev_loss_tmo(struct fc_rport *rport,
 871                                      unsigned long val)
 872 {
 873         struct Scsi_Host *shost = rport_to_shost(rport);
 874         struct fc_internal *i = to_fc_internal(shost->transportt);
 875
 876         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
 877             (rport->port_state == FC_PORTSTATE_DELETED) ||
 878             (rport->port_state == FC_PORTSTATE_NOTPRESENT))
 879                 return -EBUSY;
 880         /*
 881          * Check for overflow; dev_loss_tmo is u32
 882          */
 883         if (val > UINT_MAX)
 884                 return -EINVAL;
 885
 886         /*
 887          * If fast_io_fail is off we have to cap
 888          * dev_loss_tmo at SCSI_DEVICE_BLOCK_MAX_TIMEOUT
 889          */
 890         if (rport->fast_io_fail_tmo == -1 &&
 891             val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT)
 892                 return -EINVAL;
 893
 894         i->f->set_rport_dev_loss_tmo(rport, val);
 895         return 0;
 896 }
 897
 898 fc_rport_show_function(dev_loss_tmo, "%d\n", 20, )
 899 static ssize_t
 900 store_fc_rport_dev_loss_tmo(struct device *dev, struct device_attribute *attr,
 901                             const char *buf, size_t count)
 902 {
 903         struct fc_rport *rport = transport_class_to_rport(dev);
 904         unsigned long val;
 905         int rc;
 906
 907         rc = fc_str_to_dev_loss(buf, &val);
 908         if (rc)
 909                 return rc;
 910
 911         rc = fc_rport_set_dev_loss_tmo(rport, val);
 912         if (rc)
 913                 return rc;
 914         return count;
 915 }
 916 static FC_DEVICE_ATTR(rport, dev_loss_tmo, S_IRUGO | S_IWUSR,
 917                 show_fc_rport_dev_loss_tmo, store_fc_rport_dev_loss_tmo);
 918
 919
 920 /* Private Remote Port Attributes */
 921
 922 fc_private_rport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
 923 fc_private_rport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
 924 fc_private_rport_rd_attr(port_id, "0x%06x\n", 20);
 925
 926 static ssize_t
 927 show_fc_rport_roles (struct device *dev, struct device_attribute *attr,
 928                      char *buf)
 929 {
 930         struct fc_rport *rport = transport_class_to_rport(dev);
 931
 932         /* identify any roles that are port_id specific */
 933         if ((rport->port_id != -1) &&
 934             (rport->port_id & FC_WELLKNOWN_PORTID_MASK) ==
 935                                         FC_WELLKNOWN_PORTID_MASK) {
 936                 switch (rport->port_id & FC_WELLKNOWN_ROLE_MASK) {
 937                 case FC_FPORT_PORTID:
 938                         return snprintf(buf, 30, "Fabric Port\n");
 939                 case FC_FABCTLR_PORTID:
 940                         return snprintf(buf, 30, "Fabric Controller\n");
 941                 case FC_DIRSRVR_PORTID:
 942                         return snprintf(buf, 30, "Directory Server\n");
 943                 case FC_TIMESRVR_PORTID:
 944                         return snprintf(buf, 30, "Time Server\n");
 945                 case FC_MGMTSRVR_PORTID:
 946                         return snprintf(buf, 30, "Management Server\n");
 947                 default:
 948                         return snprintf(buf, 30, "Unknown Fabric Entity\n");
 949                 }
 950         } else {
 951                 if (rport->roles == FC_PORT_ROLE_UNKNOWN)
 952                         return snprintf(buf, 20, "unknown\n");
 953                 return get_fc_port_roles_names(rport->roles, buf);
 954         }
 955 }
 956 static FC_DEVICE_ATTR(rport, roles, S_IRUGO,
 957                 show_fc_rport_roles, NULL);
 958
 959 fc_private_rport_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
 960 fc_private_rport_rd_attr(scsi_target_id, "%d\n", 20);
 961
 962 /*
 963  * fast_io_fail_tmo attribute
 964  */
 965 static ssize_t
 966 show_fc_rport_fast_io_fail_tmo (struct device *dev,
 967                                 struct device_attribute *attr, char *buf)
 968 {
 969         struct fc_rport *rport = transport_class_to_rport(dev);
 970
 971         if (rport->fast_io_fail_tmo == -1)
 972                 return snprintf(buf, 5, "off\n");
 973         return snprintf(buf, 20, "%d\n", rport->fast_io_fail_tmo);
 974 }
 975
 976 static ssize_t
 977 store_fc_rport_fast_io_fail_tmo(struct device *dev,
 978                                 struct device_attribute *attr, const char *buf,
 979                                 size_t count)
 980 {
 981         int val;
 982         char *cp;
 983         struct fc_rport *rport = transport_class_to_rport(dev);
 984
 985         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
 986             (rport->port_state == FC_PORTSTATE_DELETED) ||
 987             (rport->port_state == FC_PORTSTATE_NOTPRESENT))
 988                 return -EBUSY;
 989         if (strncmp(buf, "off", 3) == 0)
 990                 rport->fast_io_fail_tmo = -1;
 991         else {
 992                 val = simple_strtoul(buf, &cp, 0);
 993                 if ((*cp && (*cp != '\n')) || (val < 0))
 994                         return -EINVAL;
 995                 /*
 996                  * Cap fast_io_fail by dev_loss_tmo or
 997                  * SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
 998                  */
 999                 if ((val >= rport->dev_loss_tmo) ||
1000                     (val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT))
1001                         return -EINVAL;
1002
1003                 rport->fast_io_fail_tmo = val;
1004         }
1005         return count;
1006 }
1007 static FC_DEVICE_ATTR(rport, fast_io_fail_tmo, S_IRUGO | S_IWUSR,
1008         show_fc_rport_fast_io_fail_tmo, store_fc_rport_fast_io_fail_tmo);
1009
1010
1011 /*
1012  * FC SCSI Target Attribute Management
1013  */
1014
1015 /*
1016  * Note: in the target show function we recognize when the remote
1017  *  port is in the hierarchy and do not allow the driver to get
1018  *  involved in sysfs functions. The driver only gets involved if
1019  *  it's the "old" style that doesn't use rports.
1020  */
1021 #define fc_starget_show_function(field, format_string, sz, cast)        \
1022 static ssize_t                                                          \
1023 show_fc_starget_##field (struct device *dev,                            \
1024                          struct device_attribute *attr, char *buf)      \
1025 {                                                                       \
1026         struct scsi_target *starget = transport_class_to_starget(dev);  \
1027         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
1028         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1029         struct fc_rport *rport = starget_to_rport(starget);             \
1030         if (rport)                                                      \
1031                 fc_starget_##field(starget) = rport->field;             \
1032         else if (i->f->get_starget_##field)                             \
1033                 i->f->get_starget_##field(starget);                     \
1034         return snprintf(buf, sz, format_string,                         \
1035                 cast fc_starget_##field(starget));                      \
1036 }
1037
1038 #define fc_starget_rd_attr(field, format_string, sz)                    \
1039         fc_starget_show_function(field, format_string, sz, )            \
1040 static FC_DEVICE_ATTR(starget, field, S_IRUGO,                  \
1041                          show_fc_starget_##field, NULL)
1042
1043 #define fc_starget_rd_attr_cast(field, format_string, sz, cast)         \
1044         fc_starget_show_function(field, format_string, sz, (cast))      \
1045 static FC_DEVICE_ATTR(starget, field, S_IRUGO,                  \
1046                           show_fc_starget_##field, NULL)
1047
1048 #define SETUP_STARGET_ATTRIBUTE_RD(field)                               \
1049         i->private_starget_attrs[count] = device_attr_starget_##field; \
1050         i->private_starget_attrs[count].attr.mode = S_IRUGO;            \
1051         i->private_starget_attrs[count].store = NULL;                   \
1052         i->starget_attrs[count] = &i->private_starget_attrs[count];     \
1053         if (i->f->show_starget_##field)                                 \
1054                 count++
1055
1056 #define SETUP_STARGET_ATTRIBUTE_RW(field)                               \
1057         i->private_starget_attrs[count] = device_attr_starget_##field; \
1058         if (!i->f->set_starget_##field) {                               \
1059                 i->private_starget_attrs[count].attr.mode = S_IRUGO;    \
1060                 i->private_starget_attrs[count].store = NULL;           \
1061         }                                                               \
1062         i->starget_attrs[count] = &i->private_starget_attrs[count];     \
1063         if (i->f->show_starget_##field)                                 \
1064                 count++
1065
1066 /* The FC Transport SCSI Target Attributes: */
1067 fc_starget_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1068 fc_starget_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1069 fc_starget_rd_attr(port_id, "0x%06x\n", 20);
1070
1071
1072 /*
1073  * FC Virtual Port Attribute Management
1074  */
1075
1076 #define fc_vport_show_function(field, format_string, sz, cast)          \
1077 static ssize_t                                                          \
1078 show_fc_vport_##field (struct device *dev,                              \
1079                        struct device_attribute *attr, char *buf)        \
1080 {                                                                       \
1081         struct fc_vport *vport = transport_class_to_vport(dev);         \
1082         struct Scsi_Host *shost = vport_to_shost(vport);                \
1083         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1084         if ((i->f->get_vport_##field) &&                                \
1085             !(vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)))       \
1086                 i->f->get_vport_##field(vport);                         \
1087         return snprintf(buf, sz, format_string, cast vport->field);     \
1088 }
1089
1090 #define fc_vport_store_function(field)                                  \
1091 static ssize_t                                                          \
1092 store_fc_vport_##field(struct device *dev,                              \
1093                        struct device_attribute *attr,                   \
1094                        const char *buf, size_t count)                   \
1095 {                                                                       \
1096         int val;                                                        \
1097         struct fc_vport *vport = transport_class_to_vport(dev);         \
1098         struct Scsi_Host *shost = vport_to_shost(vport);                \
1099         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1100         char *cp;                                                       \
1101         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))  \
1102                 return -EBUSY;                                          \
1103         val = simple_strtoul(buf, &cp, 0);                              \
1104         if (*cp && (*cp != '\n'))                                       \
1105                 return -EINVAL;                                         \
1106         i->f->set_vport_##field(vport, val);                            \
1107         return count;                                                   \
1108 }
1109
1110 #define fc_vport_store_str_function(field, slen)                        \
1111 static ssize_t                                                          \
1112 store_fc_vport_##field(struct device *dev,                              \
1113                        struct device_attribute *attr,                   \
1114                        const char *buf, size_t count)                   \
1115 {                                                                       \
1116         struct fc_vport *vport = transport_class_to_vport(dev);         \
1117         struct Scsi_Host *shost = vport_to_shost(vport);                \
1118         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1119         unsigned int cnt=count;                                         \
1120                                                                         \
1121         /* count may include a LF at end of string */                   \
1122         if (buf[cnt-1] == '\n')                                         \
1123                 cnt--;                                                  \
1124         if (cnt > ((slen) - 1))                                         \
1125                 return -EINVAL;                                         \
1126         memcpy(vport->field, buf, cnt);                                 \
1127         i->f->set_vport_##field(vport);                                 \
1128         return count;                                                   \
1129 }
1130
1131 #define fc_vport_rd_attr(field, format_string, sz)                      \
1132         fc_vport_show_function(field, format_string, sz, )              \
1133 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1134                          show_fc_vport_##field, NULL)
1135
1136 #define fc_vport_rd_attr_cast(field, format_string, sz, cast)           \
1137         fc_vport_show_function(field, format_string, sz, (cast))        \
1138 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1139                           show_fc_vport_##field, NULL)
1140
1141 #define fc_vport_rw_attr(field, format_string, sz)                      \
1142         fc_vport_show_function(field, format_string, sz, )              \
1143         fc_vport_store_function(field)                                  \
1144 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR,          \
1145                         show_fc_vport_##field,                          \
1146                         store_fc_vport_##field)
1147
1148 #define fc_private_vport_show_function(field, format_string, sz, cast)  \
1149 static ssize_t                                                          \
1150 show_fc_vport_##field (struct device *dev,                              \
1151                        struct device_attribute *attr, char *buf)        \
1152 {                                                                       \
1153         struct fc_vport *vport = transport_class_to_vport(dev);         \
1154         return snprintf(buf, sz, format_string, cast vport->field);     \
1155 }
1156
1157 #define fc_private_vport_store_u32_function(field)                      \
1158 static ssize_t                                                          \
1159 store_fc_vport_##field(struct device *dev,                              \
1160                        struct device_attribute *attr,                   \
1161                        const char *buf, size_t count)                   \
1162 {                                                                       \
1163         u32 val;                                                        \
1164         struct fc_vport *vport = transport_class_to_vport(dev);         \
1165         char *cp;                                                       \
1166         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))          \
1167                 return -EBUSY;                                          \
1168         val = simple_strtoul(buf, &cp, 0);                              \
1169         if (*cp && (*cp != '\n'))                                       \
1170                 return -EINVAL;                                         \
1171         vport->field = val;                                             \
1172         return count;                                                   \
1173 }
1174
1175
1176 #define fc_private_vport_rd_attr(field, format_string, sz)              \
1177         fc_private_vport_show_function(field, format_string, sz, )      \
1178 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1179                          show_fc_vport_##field, NULL)
1180
1181 #define fc_private_vport_rd_attr_cast(field, format_string, sz, cast)   \
1182         fc_private_vport_show_function(field, format_string, sz, (cast)) \
1183 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1184                           show_fc_vport_##field, NULL)
1185
1186 #define fc_private_vport_rw_u32_attr(field, format_string, sz)          \
1187         fc_private_vport_show_function(field, format_string, sz, )      \
1188         fc_private_vport_store_u32_function(field)                      \
1189 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR,          \
1190                         show_fc_vport_##field,                          \
1191                         store_fc_vport_##field)
1192
1193
1194 #define fc_private_vport_rd_enum_attr(title, maxlen)                    \
1195 static ssize_t                                                          \
1196 show_fc_vport_##title (struct device *dev,                              \
1197                        struct device_attribute *attr,                   \
1198                        char *buf)                                       \
1199 {                                                                       \
1200         struct fc_vport *vport = transport_class_to_vport(dev);         \
1201         const char *name;                                               \
1202         name = get_fc_##title##_name(vport->title);                     \
1203         if (!name)                                                      \
1204                 return -EINVAL;                                         \
1205         return snprintf(buf, maxlen, "%s\n", name);                     \
1206 }                                                                       \
1207 static FC_DEVICE_ATTR(vport, title, S_IRUGO,                    \
1208                         show_fc_vport_##title, NULL)
1209
1210
1211 #define SETUP_VPORT_ATTRIBUTE_RD(field)                                 \
1212         i->private_vport_attrs[count] = device_attr_vport_##field; \
1213         i->private_vport_attrs[count].attr.mode = S_IRUGO;              \
1214         i->private_vport_attrs[count].store = NULL;                     \
1215         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1216         if (i->f->get_##field)                                          \
1217                 count++
1218         /* NOTE: Above MACRO differs: checks function not show bit */
1219
1220 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(field)                         \
1221         i->private_vport_attrs[count] = device_attr_vport_##field; \
1222         i->private_vport_attrs[count].attr.mode = S_IRUGO;              \
1223         i->private_vport_attrs[count].store = NULL;                     \
1224         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1225         count++
1226
1227 #define SETUP_VPORT_ATTRIBUTE_WR(field)                                 \
1228         i->private_vport_attrs[count] = device_attr_vport_##field; \
1229         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1230         if (i->f->field)                                                \
1231                 count++
1232         /* NOTE: Above MACRO differs: checks function */
1233
1234 #define SETUP_VPORT_ATTRIBUTE_RW(field)                                 \
1235         i->private_vport_attrs[count] = device_attr_vport_##field; \
1236         if (!i->f->set_vport_##field) {                                 \
1237                 i->private_vport_attrs[count].attr.mode = S_IRUGO;      \
1238                 i->private_vport_attrs[count].store = NULL;             \
1239         }                                                               \
1240         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1241         count++
1242         /* NOTE: Above MACRO differs: does not check show bit */
1243
1244 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RW(field)                         \
1245 {                                                                       \
1246         i->private_vport_attrs[count] = device_attr_vport_##field; \
1247         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1248         count++;                                                        \
1249 }
1250
1251
1252 /* The FC Transport Virtual Port Attributes: */
1253
1254 /* Fixed Virtual Port Attributes */
1255
1256 /* Dynamic Virtual Port Attributes */
1257
1258 /* Private Virtual Port Attributes */
1259
1260 fc_private_vport_rd_enum_attr(vport_state, FC_VPORTSTATE_MAX_NAMELEN);
1261 fc_private_vport_rd_enum_attr(vport_last_state, FC_VPORTSTATE_MAX_NAMELEN);
1262 fc_private_vport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1263 fc_private_vport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1264
1265 static ssize_t
1266 show_fc_vport_roles (struct device *dev, struct device_attribute *attr,
1267                      char *buf)
1268 {
1269         struct fc_vport *vport = transport_class_to_vport(dev);
1270
1271         if (vport->roles == FC_PORT_ROLE_UNKNOWN)
1272                 return snprintf(buf, 20, "unknown\n");
1273         return get_fc_port_roles_names(vport->roles, buf);
1274 }
1275 static FC_DEVICE_ATTR(vport, roles, S_IRUGO, show_fc_vport_roles, NULL);
1276
1277 fc_private_vport_rd_enum_attr(vport_type, FC_PORTTYPE_MAX_NAMELEN);
1278
1279 fc_private_vport_show_function(symbolic_name, "%s\n",
1280                 FC_VPORT_SYMBOLIC_NAMELEN + 1, )
1281 fc_vport_store_str_function(symbolic_name, FC_VPORT_SYMBOLIC_NAMELEN)
1282 static FC_DEVICE_ATTR(vport, symbolic_name, S_IRUGO | S_IWUSR,
1283                 show_fc_vport_symbolic_name, store_fc_vport_symbolic_name);
1284
1285 static ssize_t
1286 store_fc_vport_delete(struct device *dev, struct device_attribute *attr,
1287                       const char *buf, size_t count)
1288 {
1289         struct fc_vport *vport = transport_class_to_vport(dev);
1290         struct Scsi_Host *shost = vport_to_shost(vport);
1291         unsigned long flags;
1292
1293         spin_lock_irqsave(shost->host_lock, flags);
1294         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING | FC_VPORT_DELETING)) {
1295                 spin_unlock_irqrestore(shost->host_lock, flags);
1296                 return -EBUSY;
1297         }
1298         vport->flags |= FC_VPORT_DELETING;
1299         spin_unlock_irqrestore(shost->host_lock, flags);
1300
1301         fc_queue_work(shost, &vport->vport_delete_work);
1302         return count;
1303 }
1304 static FC_DEVICE_ATTR(vport, vport_delete, S_IWUSR,
1305                         NULL, store_fc_vport_delete);
1306
1307
1308 /*
1309  * Enable/Disable vport
1310  *  Write "1" to disable, write "0" to enable
1311  */
1312 static ssize_t
1313 store_fc_vport_disable(struct device *dev, struct device_attribute *attr,
1314                        const char *buf,
1315                            size_t count)
1316 {
1317         struct fc_vport *vport = transport_class_to_vport(dev);
1318         struct Scsi_Host *shost = vport_to_shost(vport);
1319         struct fc_internal *i = to_fc_internal(shost->transportt);
1320         int stat;
1321
1322         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))
1323                 return -EBUSY;
1324
1325         if (*buf == '0') {
1326                 if (vport->vport_state != FC_VPORT_DISABLED)
1327                         return -EALREADY;
1328         } else if (*buf == '1') {
1329                 if (vport->vport_state == FC_VPORT_DISABLED)
1330                         return -EALREADY;
1331         } else
1332                 return -EINVAL;
1333
1334         stat = i->f->vport_disable(vport, ((*buf == '0') ? false : true));
1335         return stat ? stat : count;
1336 }
1337 static FC_DEVICE_ATTR(vport, vport_disable, S_IWUSR,
1338                         NULL, store_fc_vport_disable);
1339
1340
1341 /*
1342  * Host Attribute Management
1343  */
1344
1345 #define fc_host_show_function(field, format_string, sz, cast)           \
1346 static ssize_t                                                          \
1347 show_fc_host_##field (struct device *dev,                               \
1348                       struct device_attribute *attr, char *buf)         \
1349 {                                                                       \
1350         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1351         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1352         if (i->f->get_host_##field)                                     \
1353                 i->f->get_host_##field(shost);                          \
1354         return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1355 }
1356
1357 #define fc_host_store_function(field)                                   \
1358 static ssize_t                                                          \
1359 store_fc_host_##field(struct device *dev,                               \
1360                       struct device_attribute *attr,                    \
1361                       const char *buf,  size_t count)                   \
1362 {                                                                       \
1363         int val;                                                        \
1364         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1365         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1366         char *cp;                                                       \
1367                                                                         \
1368         val = simple_strtoul(buf, &cp, 0);                              \
1369         if (*cp && (*cp != '\n'))                                       \
1370                 return -EINVAL;                                         \
1371         i->f->set_host_##field(shost, val);                             \
1372         return count;                                                   \
1373 }
1374
1375 #define fc_host_store_str_function(field, slen)                         \
1376 static ssize_t                                                          \
1377 store_fc_host_##field(struct device *dev,                               \
1378                       struct device_attribute *attr,                    \
1379                       const char *buf, size_t count)                    \
1380 {                                                                       \
1381         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1382         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1383         unsigned int cnt=count;                                         \
1384                                                                         \
1385         /* count may include a LF at end of string */                   \
1386         if (buf[cnt-1] == '\n')                                         \
1387                 cnt--;                                                  \
1388         if (cnt > ((slen) - 1))                                         \
1389                 return -EINVAL;                                         \
1390         memcpy(fc_host_##field(shost), buf, cnt);                       \
1391         i->f->set_host_##field(shost);                                  \
1392         return count;                                                   \
1393 }
1394
1395 #define fc_host_rd_attr(field, format_string, sz)                       \
1396         fc_host_show_function(field, format_string, sz, )               \
1397 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1398                          show_fc_host_##field, NULL)
1399
1400 #define fc_host_rd_attr_cast(field, format_string, sz, cast)            \
1401         fc_host_show_function(field, format_string, sz, (cast))         \
1402 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1403                           show_fc_host_##field, NULL)
1404
1405 #define fc_host_rw_attr(field, format_string, sz)                       \
1406         fc_host_show_function(field, format_string, sz, )               \
1407         fc_host_store_function(field)                                   \
1408 static FC_DEVICE_ATTR(host, field, S_IRUGO | S_IWUSR,           \
1409                         show_fc_host_##field,                           \
1410                         store_fc_host_##field)
1411
1412 #define fc_host_rd_enum_attr(title, maxlen)                             \
1413 static ssize_t                                                          \
1414 show_fc_host_##title (struct device *dev,                               \
1415                       struct device_attribute *attr, char *buf)         \
1416 {                                                                       \
1417         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1418         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1419         const char *name;                                               \
1420         if (i->f->get_host_##title)                                     \
1421                 i->f->get_host_##title(shost);                          \
1422         name = get_fc_##title##_name(fc_host_##title(shost));           \
1423         if (!name)                                                      \
1424                 return -EINVAL;                                         \
1425         return snprintf(buf, maxlen, "%s\n", name);                     \
1426 }                                                                       \
1427 static FC_DEVICE_ATTR(host, title, S_IRUGO, show_fc_host_##title, NULL)
1428
1429 #define SETUP_HOST_ATTRIBUTE_RD(field)                                  \
1430         i->private_host_attrs[count] = device_attr_host_##field;        \
1431         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
1432         i->private_host_attrs[count].store = NULL;                      \
1433         i->host_attrs[count] = &i->private_host_attrs[count];           \
1434         if (i->f->show_host_##field)                                    \
1435                 count++
1436
1437 #define SETUP_HOST_ATTRIBUTE_RD_NS(field)                               \
1438         i->private_host_attrs[count] = device_attr_host_##field;        \
1439         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
1440         i->private_host_attrs[count].store = NULL;                      \
1441         i->host_attrs[count] = &i->private_host_attrs[count];           \
1442         count++
1443
1444 #define SETUP_HOST_ATTRIBUTE_RW(field)                                  \
1445         i->private_host_attrs[count] = device_attr_host_##field;        \
1446         if (!i->f->set_host_##field) {                                  \
1447                 i->private_host_attrs[count].attr.mode = S_IRUGO;       \
1448                 i->private_host_attrs[count].store = NULL;              \
1449         }                                                               \
1450         i->host_attrs[count] = &i->private_host_attrs[count];           \
1451         if (i->f->show_host_##field)                                    \
1452                 count++
1453
1454
1455 #define fc_private_host_show_function(field, format_string, sz, cast)   \
1456 static ssize_t                                                          \
1457 show_fc_host_##field (struct device *dev,                               \
1458                       struct device_attribute *attr, char *buf)         \
1459 {                                                                       \
1460         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1461         return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1462 }
1463
1464 #define fc_private_host_rd_attr(field, format_string, sz)               \
1465         fc_private_host_show_function(field, format_string, sz, )       \
1466 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1467                          show_fc_host_##field, NULL)
1468
1469 #define fc_private_host_rd_attr_cast(field, format_string, sz, cast)    \
1470         fc_private_host_show_function(field, format_string, sz, (cast)) \
1471 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1472                           show_fc_host_##field, NULL)
1473
1474 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RD(field)                  \
1475         i->private_host_attrs[count] = device_attr_host_##field;        \
1476         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
1477         i->private_host_attrs[count].store = NULL;                      \
1478         i->host_attrs[count] = &i->private_host_attrs[count];           \
1479         count++
1480
1481 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RW(field)                  \
1482 {                                                                       \
1483         i->private_host_attrs[count] = device_attr_host_##field;        \
1484         i->host_attrs[count] = &i->private_host_attrs[count];           \
1485         count++;                                                        \
1486 }
1487
1488
1489 /* Fixed Host Attributes */
1490
1491 static ssize_t
1492 show_fc_host_supported_classes (struct device *dev,
1493                                 struct device_attribute *attr, char *buf)
1494 {
1495         struct Scsi_Host *shost = transport_class_to_shost(dev);
1496
1497         if (fc_host_supported_classes(shost) == FC_COS_UNSPECIFIED)
1498                 return snprintf(buf, 20, "unspecified\n");
1499
1500         return get_fc_cos_names(fc_host_supported_classes(shost), buf);
1501 }
1502 static FC_DEVICE_ATTR(host, supported_classes, S_IRUGO,
1503                 show_fc_host_supported_classes, NULL);
1504
1505 static ssize_t
1506 show_fc_host_supported_fc4s (struct device *dev,
1507                              struct device_attribute *attr, char *buf)
1508 {
1509         struct Scsi_Host *shost = transport_class_to_shost(dev);
1510         return (ssize_t)show_fc_fc4s(buf, fc_host_supported_fc4s(shost));
1511 }
1512 static FC_DEVICE_ATTR(host, supported_fc4s, S_IRUGO,
1513                 show_fc_host_supported_fc4s, NULL);
1514
1515 static ssize_t
1516 show_fc_host_supported_speeds (struct device *dev,
1517                                struct device_attribute *attr, char *buf)
1518 {
1519         struct Scsi_Host *shost = transport_class_to_shost(dev);
1520
1521         if (fc_host_supported_speeds(shost) == FC_PORTSPEED_UNKNOWN)
1522                 return snprintf(buf, 20, "unknown\n");
1523
1524         return get_fc_port_speed_names(fc_host_supported_speeds(shost), buf);
1525 }
1526 static FC_DEVICE_ATTR(host, supported_speeds, S_IRUGO,
1527                 show_fc_host_supported_speeds, NULL);
1528
1529
1530 fc_private_host_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1531 fc_private_host_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1532 fc_private_host_rd_attr_cast(permanent_port_name, "0x%llx\n", 20,
1533                              unsigned long long);
1534 fc_private_host_rd_attr(maxframe_size, "%u bytes\n", 20);
1535 fc_private_host_rd_attr(max_npiv_vports, "%u\n", 20);
1536 fc_private_host_rd_attr(serial_number, "%s\n", (FC_SERIAL_NUMBER_SIZE +1));
1537 fc_private_host_rd_attr(manufacturer, "%s\n", FC_SERIAL_NUMBER_SIZE + 1);
1538 fc_private_host_rd_attr(model, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1539 fc_private_host_rd_attr(model_description, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1540 fc_private_host_rd_attr(hardware_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1541 fc_private_host_rd_attr(driver_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1542 fc_private_host_rd_attr(firmware_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1543 fc_private_host_rd_attr(optionrom_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1544
1545
1546 /* Dynamic Host Attributes */
1547
1548 static ssize_t
1549 show_fc_host_active_fc4s (struct device *dev,
1550                           struct device_attribute *attr, char *buf)
1551 {
1552         struct Scsi_Host *shost = transport_class_to_shost(dev);
1553         struct fc_internal *i = to_fc_internal(shost->transportt);
1554
1555         if (i->f->get_host_active_fc4s)
1556                 i->f->get_host_active_fc4s(shost);
1557
1558         return (ssize_t)show_fc_fc4s(buf, fc_host_active_fc4s(shost));
1559 }
1560 static FC_DEVICE_ATTR(host, active_fc4s, S_IRUGO,
1561                 show_fc_host_active_fc4s, NULL);
1562
1563 static ssize_t
1564 show_fc_host_speed (struct device *dev,
1565                     struct device_attribute *attr, char *buf)
1566 {
1567         struct Scsi_Host *shost = transport_class_to_shost(dev);
1568         struct fc_internal *i = to_fc_internal(shost->transportt);
1569
1570         if (i->f->get_host_speed)
1571                 i->f->get_host_speed(shost);
1572
1573         if (fc_host_speed(shost) == FC_PORTSPEED_UNKNOWN)
1574                 return snprintf(buf, 20, "unknown\n");
1575
1576         return get_fc_port_speed_names(fc_host_speed(shost), buf);
1577 }
1578 static FC_DEVICE_ATTR(host, speed, S_IRUGO,
1579                 show_fc_host_speed, NULL);
1580
1581
1582 fc_host_rd_attr(port_id, "0x%06x\n", 20);
1583 fc_host_rd_enum_attr(port_type, FC_PORTTYPE_MAX_NAMELEN);
1584 fc_host_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
1585 fc_host_rd_attr_cast(fabric_name, "0x%llx\n", 20, unsigned long long);
1586 fc_host_rd_attr(symbolic_name, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1587
1588 fc_private_host_show_function(system_hostname, "%s\n",
1589                 FC_SYMBOLIC_NAME_SIZE + 1, )
1590 fc_host_store_str_function(system_hostname, FC_SYMBOLIC_NAME_SIZE)
1591 static FC_DEVICE_ATTR(host, system_hostname, S_IRUGO | S_IWUSR,
1592                 show_fc_host_system_hostname, store_fc_host_system_hostname);
1593
1594
1595 /* Private Host Attributes */
1596
1597 static ssize_t
1598 show_fc_private_host_tgtid_bind_type(struct device *dev,
1599                                      struct device_attribute *attr, char *buf)
1600 {
1601         struct Scsi_Host *shost = transport_class_to_shost(dev);
1602         const char *name;
1603
1604         name = get_fc_tgtid_bind_type_name(fc_host_tgtid_bind_type(shost));
1605         if (!name)
1606                 return -EINVAL;
1607         return snprintf(buf, FC_BINDTYPE_MAX_NAMELEN, "%s\n", name);
1608 }
1609
1610 #define get_list_head_entry(pos, head, member)          \
1611         pos = list_entry((head)->next, typeof(*pos), member)
1612
1613 static ssize_t
1614 store_fc_private_host_tgtid_bind_type(struct device *dev,
1615         struct device_attribute *attr, const char *buf, size_t count)
1616 {
1617         struct Scsi_Host *shost = transport_class_to_shost(dev);
1618         struct fc_rport *rport;
1619         enum fc_tgtid_binding_type val;
1620         unsigned long flags;
1621
1622         if (get_fc_tgtid_bind_type_match(buf, &val))
1623                 return -EINVAL;
1624
1625         /* if changing bind type, purge all unused consistent bindings */
1626         if (val != fc_host_tgtid_bind_type(shost)) {
1627                 spin_lock_irqsave(shost->host_lock, flags);
1628                 while (!list_empty(&fc_host_rport_bindings(shost))) {
1629                         get_list_head_entry(rport,
1630                                 &fc_host_rport_bindings(shost), peers);
1631                         list_del(&rport->peers);
1632                         rport->port_state = FC_PORTSTATE_DELETED;
1633                         fc_queue_work(shost, &rport->rport_delete_work);
1634                 }
1635                 spin_unlock_irqrestore(shost->host_lock, flags);
1636         }
1637
1638         fc_host_tgtid_bind_type(shost) = val;
1639         return count;
1640 }
1641
1642 static FC_DEVICE_ATTR(host, tgtid_bind_type, S_IRUGO | S_IWUSR,
1643                         show_fc_private_host_tgtid_bind_type,
1644                         store_fc_private_host_tgtid_bind_type);
1645
1646 static ssize_t
1647 store_fc_private_host_issue_lip(struct device *dev,
1648         struct device_attribute *attr, const char *buf, size_t count)
1649 {
1650         struct Scsi_Host *shost = transport_class_to_shost(dev);
1651         struct fc_internal *i = to_fc_internal(shost->transportt);
1652         int ret;
1653
1654         /* ignore any data value written to the attribute */
1655         if (i->f->issue_fc_host_lip) {
1656                 ret = i->f->issue_fc_host_lip(shost);
1657                 return ret ? ret: count;
1658         }
1659
1660         return -ENOENT;
1661 }
1662
1663 static FC_DEVICE_ATTR(host, issue_lip, S_IWUSR, NULL,
1664                         store_fc_private_host_issue_lip);
1665
1666 static ssize_t
1667 store_fc_private_host_dev_loss_tmo(struct device *dev,
1668                                    struct device_attribute *attr,
1669                                    const char *buf, size_t count)
1670 {
1671         struct Scsi_Host *shost = transport_class_to_shost(dev);
1672         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
1673         struct fc_rport *rport;
1674         unsigned long val, flags;
1675         int rc;
1676
1677         rc = fc_str_to_dev_loss(buf, &val);
1678         if (rc)
1679                 return rc;
1680
1681         fc_host_dev_loss_tmo(shost) = val;
1682         spin_lock_irqsave(shost->host_lock, flags);
1683         list_for_each_entry(rport, &fc_host->rports, peers)
1684                 fc_rport_set_dev_loss_tmo(rport, val);
1685         spin_unlock_irqrestore(shost->host_lock, flags);
1686         return count;
1687 }
1688
1689 fc_private_host_show_function(dev_loss_tmo, "%d\n", 20, );
1690 static FC_DEVICE_ATTR(host, dev_loss_tmo, S_IRUGO | S_IWUSR,
1691                       show_fc_host_dev_loss_tmo,
1692                       store_fc_private_host_dev_loss_tmo);
1693
1694 fc_private_host_rd_attr(npiv_vports_inuse, "%u\n", 20);
1695
1696 /*
1697  * Host Statistics Management
1698  */
1699
1700 /* Show a given attribute in the statistics group */
1701 static ssize_t
1702 fc_stat_show(const struct device *dev, char *buf, unsigned long offset)
1703 {
1704         struct Scsi_Host *shost = transport_class_to_shost(dev);
1705         struct fc_internal *i = to_fc_internal(shost->transportt);
1706         struct fc_host_statistics *stats;
1707         ssize_t ret = -ENOENT;
1708
1709         if (offset > sizeof(struct fc_host_statistics) ||
1710             offset % sizeof(u64) != 0)
1711                 WARN_ON(1);
1712
1713         if (i->f->get_fc_host_stats) {
1714                 stats = (i->f->get_fc_host_stats)(shost);
1715                 if (stats)
1716                         ret = snprintf(buf, 20, "0x%llx\n",
1717                               (unsigned long long)*(u64 *)(((u8 *) stats) + offset));
1718         }
1719         return ret;
1720 }
1721
1722
1723 /* generate a read-only statistics attribute */
1724 #define fc_host_statistic(name)                                         \
1725 static ssize_t show_fcstat_##name(struct device *cd,                    \
1726                                   struct device_attribute *attr,        \
1727                                   char *buf)                            \
1728 {                                                                       \
1729         return fc_stat_show(cd, buf,                                    \
1730                             offsetof(struct fc_host_statistics, name)); \
1731 }                                                                       \
1732 static FC_DEVICE_ATTR(host, name, S_IRUGO, show_fcstat_##name, NULL)
1733
1734 fc_host_statistic(seconds_since_last_reset);
1735 fc_host_statistic(tx_frames);
1736 fc_host_statistic(tx_words);
1737 fc_host_statistic(rx_frames);
1738 fc_host_statistic(rx_words);
1739 fc_host_statistic(lip_count);
1740 fc_host_statistic(nos_count);
1741 fc_host_statistic(error_frames);
1742 fc_host_statistic(dumped_frames);
1743 fc_host_statistic(link_failure_count);
1744 fc_host_statistic(loss_of_sync_count);
1745 fc_host_statistic(loss_of_signal_count);
1746 fc_host_statistic(prim_seq_protocol_err_count);
1747 fc_host_statistic(invalid_tx_word_count);
1748 fc_host_statistic(invalid_crc_count);
1749 fc_host_statistic(fcp_input_requests);
1750 fc_host_statistic(fcp_output_requests);
1751 fc_host_statistic(fcp_control_requests);
1752 fc_host_statistic(fcp_input_megabytes);
1753 fc_host_statistic(fcp_output_megabytes);
1754 fc_host_statistic(fcp_packet_alloc_failures);
1755 fc_host_statistic(fcp_packet_aborts);
1756 fc_host_statistic(fcp_frame_alloc_failures);
1757 fc_host_statistic(fc_no_free_exch);
1758 fc_host_statistic(fc_no_free_exch_xid);
1759 fc_host_statistic(fc_xid_not_found);
1760 fc_host_statistic(fc_xid_busy);
1761 fc_host_statistic(fc_seq_not_found);
1762 fc_host_statistic(fc_non_bls_resp);
1763
1764 static ssize_t
1765 fc_reset_statistics(struct device *dev, struct device_attribute *attr,
1766                     const char *buf, size_t count)
1767 {
1768         struct Scsi_Host *shost = transport_class_to_shost(dev);
1769         struct fc_internal *i = to_fc_internal(shost->transportt);
1770
1771         /* ignore any data value written to the attribute */
1772         if (i->f->reset_fc_host_stats) {
1773                 i->f->reset_fc_host_stats(shost);
1774                 return count;
1775         }
1776
1777         return -ENOENT;
1778 }
1779 static FC_DEVICE_ATTR(host, reset_statistics, S_IWUSR, NULL,
1780                                 fc_reset_statistics);
1781
1782 static struct attribute *fc_statistics_attrs[] = {
1783         &device_attr_host_seconds_since_last_reset.attr,
1784         &device_attr_host_tx_frames.attr,
1785         &device_attr_host_tx_words.attr,
1786         &device_attr_host_rx_frames.attr,
1787         &device_attr_host_rx_words.attr,
1788         &device_attr_host_lip_count.attr,
1789         &device_attr_host_nos_count.attr,
1790         &device_attr_host_error_frames.attr,
1791         &device_attr_host_dumped_frames.attr,
1792         &device_attr_host_link_failure_count.attr,
1793         &device_attr_host_loss_of_sync_count.attr,
1794         &device_attr_host_loss_of_signal_count.attr,
1795         &device_attr_host_prim_seq_protocol_err_count.attr,
1796         &device_attr_host_invalid_tx_word_count.attr,
1797         &device_attr_host_invalid_crc_count.attr,
1798         &device_attr_host_fcp_input_requests.attr,
1799         &device_attr_host_fcp_output_requests.attr,
1800         &device_attr_host_fcp_control_requests.attr,
1801         &device_attr_host_fcp_input_megabytes.attr,
1802         &device_attr_host_fcp_output_megabytes.attr,
1803         &device_attr_host_fcp_packet_alloc_failures.attr,
1804         &device_attr_host_fcp_packet_aborts.attr,
1805         &device_attr_host_fcp_frame_alloc_failures.attr,
1806         &device_attr_host_fc_no_free_exch.attr,
1807         &device_attr_host_fc_no_free_exch_xid.attr,
1808         &device_attr_host_fc_xid_not_found.attr,
1809         &device_attr_host_fc_xid_busy.attr,
1810         &device_attr_host_fc_seq_not_found.attr,
1811         &device_attr_host_fc_non_bls_resp.attr,
1812         &device_attr_host_reset_statistics.attr,
1813         NULL
1814 };
1815
1816 static struct attribute_group fc_statistics_group = {
1817         .name = "statistics",
1818         .attrs = fc_statistics_attrs,
1819 };
1820
1821
1822 /* Host Vport Attributes */
1823
1824 static int
1825 fc_parse_wwn(const char *ns, u64 *nm)
1826 {
1827         unsigned int i, j;
1828         u8 wwn[8];
1829
1830         memset(wwn, 0, sizeof(wwn));
1831
1832         /* Validate and store the new name */
1833         for (i=0, j=0; i < 16; i++) {
1834                 int value;
1835
1836                 value = hex_to_bin(*ns++);
1837                 if (value >= 0)
1838                         j = (j << 4) | value;
1839                 else
1840                         return -EINVAL;
1841                 if (i % 2) {
1842                         wwn[i/2] = j & 0xff;
1843                         j = 0;
1844                 }
1845         }
1846
1847         *nm = wwn_to_u64(wwn);
1848
1849         return 0;
1850 }
1851
1852
1853 /*
1854  * "Short-cut" sysfs variable to create a new vport on a FC Host.
1855  * Input is a string of the form "<WWPN>:<WWNN>". Other attributes
1856  * will default to a NPIV-based FCP_Initiator; The WWNs are specified
1857  * as hex characters, and may *not* contain any prefixes (e.g. 0x, x, etc)
1858  */
1859 static ssize_t
1860 store_fc_host_vport_create(struct device *dev, struct device_attribute *attr,
1861                            const char *buf, size_t count)
1862 {
1863         struct Scsi_Host *shost = transport_class_to_shost(dev);
1864         struct fc_vport_identifiers vid;
1865         struct fc_vport *vport;
1866         unsigned int cnt=count;
1867         int stat;
1868
1869         memset(&vid, 0, sizeof(vid));
1870
1871         /* count may include a LF at end of string */
1872         if (buf[cnt-1] == '\n')
1873                 cnt--;
1874
1875         /* validate we have enough characters for WWPN */
1876         if ((cnt != (16+1+16)) || (buf[16] != ':'))
1877                 return -EINVAL;
1878
1879         stat = fc_parse_wwn(&buf[0], &vid.port_name);
1880         if (stat)
1881                 return stat;
1882
1883         stat = fc_parse_wwn(&buf[17], &vid.node_name);
1884         if (stat)
1885                 return stat;
1886
1887         vid.roles = FC_PORT_ROLE_FCP_INITIATOR;
1888         vid.vport_type = FC_PORTTYPE_NPIV;
1889         /* vid.symbolic_name is already zero/NULL's */
1890         vid.disable = false;            /* always enabled */
1891
1892         /* we only allow support on Channel 0 !!! */
1893         stat = fc_vport_setup(shost, 0, &shost->shost_gendev, &vid, &vport);
1894         return stat ? stat : count;
1895 }
1896 static FC_DEVICE_ATTR(host, vport_create, S_IWUSR, NULL,
1897                         store_fc_host_vport_create);
1898
1899
1900 /*
1901  * "Short-cut" sysfs variable to delete a vport on a FC Host.
1902  * Vport is identified by a string containing "<WWPN>:<WWNN>".
1903  * The WWNs are specified as hex characters, and may *not* contain
1904  * any prefixes (e.g. 0x, x, etc)
1905  */
1906 static ssize_t
1907 store_fc_host_vport_delete(struct device *dev, struct device_attribute *attr,
1908                            const char *buf, size_t count)
1909 {
1910         struct Scsi_Host *shost = transport_class_to_shost(dev);
1911         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
1912         struct fc_vport *vport;
1913         u64 wwpn, wwnn;
1914         unsigned long flags;
1915         unsigned int cnt=count;
1916         int stat, match;
1917
1918         /* count may include a LF at end of string */
1919         if (buf[cnt-1] == '\n')
1920                 cnt--;
1921
1922         /* validate we have enough characters for WWPN */
1923         if ((cnt != (16+1+16)) || (buf[16] != ':'))
1924                 return -EINVAL;
1925
1926         stat = fc_parse_wwn(&buf[0], &wwpn);
1927         if (stat)
1928                 return stat;
1929
1930         stat = fc_parse_wwn(&buf[17], &wwnn);
1931         if (stat)
1932                 return stat;
1933
1934         spin_lock_irqsave(shost->host_lock, flags);
1935         match = 0;
1936         /* we only allow support on Channel 0 !!! */
1937         list_for_each_entry(vport, &fc_host->vports, peers) {
1938                 if ((vport->channel == 0) &&
1939                     (vport->port_name == wwpn) && (vport->node_name == wwnn)) {
1940                         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))
1941                                 break;
1942                         vport->flags |= FC_VPORT_DELETING;
1943                         match = 1;
1944                         break;
1945                 }
1946         }
1947         spin_unlock_irqrestore(shost->host_lock, flags);
1948
1949         if (!match)
1950                 return -ENODEV;
1951
1952         stat = fc_vport_terminate(vport);
1953         return stat ? stat : count;
1954 }
1955 static FC_DEVICE_ATTR(host, vport_delete, S_IWUSR, NULL,
1956                         store_fc_host_vport_delete);
1957
1958
1959 static int fc_host_match(struct attribute_container *cont,
1960                           struct device *dev)
1961 {
1962         struct Scsi_Host *shost;
1963         struct fc_internal *i;
1964
1965         if (!scsi_is_host_device(dev))
1966                 return 0;
1967
1968         shost = dev_to_shost(dev);
1969         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1970             != &fc_host_class.class)
1971                 return 0;
1972
1973         i = to_fc_internal(shost->transportt);
1974
1975         return &i->t.host_attrs.ac == cont;
1976 }
1977
1978 static int fc_target_match(struct attribute_container *cont,
1979                             struct device *dev)
1980 {
1981         struct Scsi_Host *shost;
1982         struct fc_internal *i;
1983
1984         if (!scsi_is_target_device(dev))
1985                 return 0;
1986
1987         shost = dev_to_shost(dev->parent);
1988         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1989             != &fc_host_class.class)
1990                 return 0;
1991
1992         i = to_fc_internal(shost->transportt);
1993
1994         return &i->t.target_attrs.ac == cont;
1995 }
1996
1997 static void fc_rport_dev_release(struct device *dev)
1998 {
1999         struct fc_rport *rport = dev_to_rport(dev);
2000         put_device(dev->parent);
2001         kfree(rport);
2002 }
2003
2004 int scsi_is_fc_rport(const struct device *dev)
2005 {
2006         return dev->release == fc_rport_dev_release;
2007 }
2008 EXPORT_SYMBOL(scsi_is_fc_rport);
2009
2010 static int fc_rport_match(struct attribute_container *cont,
2011                             struct device *dev)
2012 {
2013         struct Scsi_Host *shost;
2014         struct fc_internal *i;
2015
2016         if (!scsi_is_fc_rport(dev))
2017                 return 0;
2018
2019         shost = dev_to_shost(dev->parent);
2020         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
2021             != &fc_host_class.class)
2022                 return 0;
2023
2024         i = to_fc_internal(shost->transportt);
2025
2026         return &i->rport_attr_cont.ac == cont;
2027 }
2028
2029
2030 static void fc_vport_dev_release(struct device *dev)
2031 {
2032         struct fc_vport *vport = dev_to_vport(dev);
2033         put_device(dev->parent);                /* release kobj parent */
2034         kfree(vport);
2035 }
2036
2037 static int scsi_is_fc_vport(const struct device *dev)
2038 {
2039         return dev->release == fc_vport_dev_release;
2040 }
2041
2042 static int fc_vport_match(struct attribute_container *cont,
2043                             struct device *dev)
2044 {
2045         struct fc_vport *vport;
2046         struct Scsi_Host *shost;
2047         struct fc_internal *i;
2048
2049         if (!scsi_is_fc_vport(dev))
2050                 return 0;
2051         vport = dev_to_vport(dev);
2052
2053         shost = vport_to_shost(vport);
2054         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
2055             != &fc_host_class.class)
2056                 return 0;
2057
2058         i = to_fc_internal(shost->transportt);
2059         return &i->vport_attr_cont.ac == cont;
2060 }
2061
2062
2063 /**
2064  * fc_eh_timed_out - FC Transport I/O timeout intercept handler
2065  * @scmd:       The SCSI command which timed out
2066  *
2067  * This routine protects against error handlers getting invoked while a
2068  * rport is in a blocked state, typically due to a temporarily loss of
2069  * connectivity. If the error handlers are allowed to proceed, requests
2070  * to abort i/o, reset the target, etc will likely fail as there is no way
2071  * to communicate with the device to perform the requested function. These
2072  * failures may result in the midlayer taking the device offline, requiring
2073  * manual intervention to restore operation.
2074  *
2075  * This routine, called whenever an i/o times out, validates the state of
2076  * the underlying rport. If the rport is blocked, it returns
2077  * EH_RESET_TIMER, which will continue to reschedule the timeout.
2078  * Eventually, either the device will return, or devloss_tmo will fire,
2079  * and when the timeout then fires, it will be handled normally.
2080  * If the rport is not blocked, normal error handling continues.
2081  *
2082  * Notes:
2083  *      This routine assumes no locks are held on entry.
2084  */
2085 enum blk_eh_timer_return
2086 fc_eh_timed_out(struct scsi_cmnd *scmd)
2087 {
2088         struct fc_rport *rport = starget_to_rport(scsi_target(scmd->device));
2089
2090         if (rport->port_state == FC_PORTSTATE_BLOCKED)
2091                 return BLK_EH_RESET_TIMER;
2092
2093         return BLK_EH_DONE;
2094 }
2095 EXPORT_SYMBOL(fc_eh_timed_out);
2096
2097 /*
2098  * Called by fc_user_scan to locate an rport on the shost that
2099  * matches the channel and target id, and invoke scsi_scan_target()
2100  * on the rport.
2101  */
2102 static void
2103 fc_user_scan_tgt(struct Scsi_Host *shost, uint channel, uint id, u64 lun)
2104 {
2105         struct fc_rport *rport;
2106         unsigned long flags;
2107
2108         spin_lock_irqsave(shost->host_lock, flags);
2109
2110         list_for_each_entry(rport, &fc_host_rports(shost), peers) {
2111                 if (rport->scsi_target_id == -1)
2112                         continue;
2113
2114                 if (rport->port_state != FC_PORTSTATE_ONLINE)
2115                         continue;
2116
2117                 if ((channel == rport->channel) &&
2118                     (id == rport->scsi_target_id)) {
2119                         spin_unlock_irqrestore(shost->host_lock, flags);
2120                         scsi_scan_target(&rport->dev, channel, id, lun,
2121                                          SCSI_SCAN_MANUAL);
2122                         return;
2123                 }
2124         }
2125
2126         spin_unlock_irqrestore(shost->host_lock, flags);
2127 }
2128
2129 /*
2130  * Called via sysfs scan routines. Necessary, as the FC transport
2131  * wants to place all target objects below the rport object. So this
2132  * routine must invoke the scsi_scan_target() routine with the rport
2133  * object as the parent.
2134  */
2135 static int
2136 fc_user_scan(struct Scsi_Host *shost, uint channel, uint id, u64 lun)
2137 {
2138         uint chlo, chhi;
2139         uint tgtlo, tgthi;
2140
2141         if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
2142             ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) ||
2143             ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun)))
2144                 return -EINVAL;
2145
2146         if (channel == SCAN_WILD_CARD) {
2147                 chlo = 0;
2148                 chhi = shost->max_channel + 1;
2149         } else {
2150                 chlo = channel;
2151                 chhi = channel + 1;
2152         }
2153
2154         if (id == SCAN_WILD_CARD) {
2155                 tgtlo = 0;
2156                 tgthi = shost->max_id;
2157         } else {
2158                 tgtlo = id;
2159                 tgthi = id + 1;
2160         }
2161
2162         for ( ; chlo < chhi; chlo++)
2163                 for ( ; tgtlo < tgthi; tgtlo++)
2164                         fc_user_scan_tgt(shost, chlo, tgtlo, lun);
2165
2166         return 0;
2167 }
2168
2169 struct scsi_transport_template *
2170 fc_attach_transport(struct fc_function_template *ft)
2171 {
2172         int count;
2173         struct fc_internal *i = kzalloc(sizeof(struct fc_internal),
2174                                         GFP_KERNEL);
2175
2176         if (unlikely(!i))
2177                 return NULL;
2178
2179         i->t.target_attrs.ac.attrs = &i->starget_attrs[0];
2180         i->t.target_attrs.ac.class = &fc_transport_class.class;
2181         i->t.target_attrs.ac.match = fc_target_match;
2182         i->t.target_size = sizeof(struct fc_starget_attrs);
2183         transport_container_register(&i->t.target_attrs);
2184
2185         i->t.host_attrs.ac.attrs = &i->host_attrs[0];
2186         i->t.host_attrs.ac.class = &fc_host_class.class;
2187         i->t.host_attrs.ac.match = fc_host_match;
2188         i->t.host_size = sizeof(struct fc_host_attrs);
2189         if (ft->get_fc_host_stats)
2190                 i->t.host_attrs.statistics = &fc_statistics_group;
2191         transport_container_register(&i->t.host_attrs);
2192
2193         i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];
2194         i->rport_attr_cont.ac.class = &fc_rport_class.class;
2195         i->rport_attr_cont.ac.match = fc_rport_match;
2196         transport_container_register(&i->rport_attr_cont);
2197
2198         i->vport_attr_cont.ac.attrs = &i->vport_attrs[0];
2199         i->vport_attr_cont.ac.class = &fc_vport_class.class;
2200         i->vport_attr_cont.ac.match = fc_vport_match;
2201         transport_container_register(&i->vport_attr_cont);
2202
2203         i->f = ft;
2204
2205         /* Transport uses the shost workq for scsi scanning */
2206         i->t.create_work_queue = 1;
2207
2208         i->t.user_scan = fc_user_scan;
2209
2210         /*
2211          * Setup SCSI Target Attributes.
2212          */
2213         count = 0;
2214         SETUP_STARGET_ATTRIBUTE_RD(node_name);
2215         SETUP_STARGET_ATTRIBUTE_RD(port_name);
2216         SETUP_STARGET_ATTRIBUTE_RD(port_id);
2217
2218         BUG_ON(count > FC_STARGET_NUM_ATTRS);
2219
2220         i->starget_attrs[count] = NULL;
2221
2222
2223         /*
2224          * Setup SCSI Host Attributes.
2225          */
2226         count=0;
2227         SETUP_HOST_ATTRIBUTE_RD(node_name);
2228         SETUP_HOST_ATTRIBUTE_RD(port_name);
2229         SETUP_HOST_ATTRIBUTE_RD(permanent_port_name);
2230         SETUP_HOST_ATTRIBUTE_RD(supported_classes);
2231         SETUP_HOST_ATTRIBUTE_RD(supported_fc4s);
2232         SETUP_HOST_ATTRIBUTE_RD(supported_speeds);
2233         SETUP_HOST_ATTRIBUTE_RD(maxframe_size);
2234         if (ft->vport_create) {
2235                 SETUP_HOST_ATTRIBUTE_RD_NS(max_npiv_vports);
2236                 SETUP_HOST_ATTRIBUTE_RD_NS(npiv_vports_inuse);
2237         }
2238         SETUP_HOST_ATTRIBUTE_RD(serial_number);
2239         SETUP_HOST_ATTRIBUTE_RD(manufacturer);
2240         SETUP_HOST_ATTRIBUTE_RD(model);
2241         SETUP_HOST_ATTRIBUTE_RD(model_description);
2242         SETUP_HOST_ATTRIBUTE_RD(hardware_version);
2243         SETUP_HOST_ATTRIBUTE_RD(driver_version);
2244         SETUP_HOST_ATTRIBUTE_RD(firmware_version);
2245         SETUP_HOST_ATTRIBUTE_RD(optionrom_version);
2246
2247         SETUP_HOST_ATTRIBUTE_RD(port_id);
2248         SETUP_HOST_ATTRIBUTE_RD(port_type);
2249         SETUP_HOST_ATTRIBUTE_RD(port_state);
2250         SETUP_HOST_ATTRIBUTE_RD(active_fc4s);
2251         SETUP_HOST_ATTRIBUTE_RD(speed);
2252         SETUP_HOST_ATTRIBUTE_RD(fabric_name);
2253         SETUP_HOST_ATTRIBUTE_RD(symbolic_name);
2254         SETUP_HOST_ATTRIBUTE_RW(system_hostname);
2255
2256         /* Transport-managed attributes */
2257         SETUP_PRIVATE_HOST_ATTRIBUTE_RW(dev_loss_tmo);
2258         SETUP_PRIVATE_HOST_ATTRIBUTE_RW(tgtid_bind_type);
2259         if (ft->issue_fc_host_lip)
2260                 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(issue_lip);
2261         if (ft->vport_create)
2262                 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_create);
2263         if (ft->vport_delete)
2264                 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_delete);
2265
2266         BUG_ON(count > FC_HOST_NUM_ATTRS);
2267
2268         i->host_attrs[count] = NULL;
2269
2270         /*
2271          * Setup Remote Port Attributes.
2272          */
2273         count=0;
2274         SETUP_RPORT_ATTRIBUTE_RD(maxframe_size);
2275         SETUP_RPORT_ATTRIBUTE_RD(supported_classes);
2276         SETUP_RPORT_ATTRIBUTE_RW(dev_loss_tmo);
2277         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(node_name);
2278         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_name);
2279         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_id);
2280         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(roles);
2281         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_state);
2282         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(scsi_target_id);
2283         SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(fast_io_fail_tmo);
2284
2285         BUG_ON(count > FC_RPORT_NUM_ATTRS);
2286
2287         i->rport_attrs[count] = NULL;
2288
2289         /*
2290          * Setup Virtual Port Attributes.
2291          */
2292         count=0;
2293         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_state);
2294         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_last_state);
2295         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(node_name);
2296         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(port_name);
2297         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(roles);
2298         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_type);
2299         SETUP_VPORT_ATTRIBUTE_RW(symbolic_name);
2300         SETUP_VPORT_ATTRIBUTE_WR(vport_delete);
2301         SETUP_VPORT_ATTRIBUTE_WR(vport_disable);
2302
2303         BUG_ON(count > FC_VPORT_NUM_ATTRS);
2304
2305         i->vport_attrs[count] = NULL;
2306
2307         return &i->t;
2308 }
2309 EXPORT_SYMBOL(fc_attach_transport);
2310
2311 void fc_release_transport(struct scsi_transport_template *t)
2312 {
2313         struct fc_internal *i = to_fc_internal(t);
2314
2315         transport_container_unregister(&i->t.target_attrs);
2316         transport_container_unregister(&i->t.host_attrs);
2317         transport_container_unregister(&i->rport_attr_cont);
2318         transport_container_unregister(&i->vport_attr_cont);
2319
2320         kfree(i);
2321 }
2322 EXPORT_SYMBOL(fc_release_transport);
2323
2324 /**
2325  * fc_queue_work - Queue work to the fc_host workqueue.
2326  * @shost:      Pointer to Scsi_Host bound to fc_host.
2327  * @work:       Work to queue for execution.
2328  *
2329  * Return value:
2330  *      1 - work queued for execution
2331  *      0 - work is already queued
2332  *      -EINVAL - work queue doesn't exist
2333  */
2334 static int
2335 fc_queue_work(struct Scsi_Host *shost, struct work_struct *work)
2336 {
2337         if (unlikely(!fc_host_work_q(shost))) {
2338                 printk(KERN_ERR
2339                         "ERROR: FC host '%s' attempted to queue work, "
2340                         "when no workqueue created.\n", shost->hostt->name);
2341                 dump_stack();
2342
2343                 return -EINVAL;
2344         }
2345
2346         return queue_work(fc_host_work_q(shost), work);
2347 }
2348
2349 /**
2350  * fc_flush_work - Flush a fc_host's workqueue.
2351  * @shost:      Pointer to Scsi_Host bound to fc_host.
2352  */
2353 static void
2354 fc_flush_work(struct Scsi_Host *shost)
2355 {
2356         if (!fc_host_work_q(shost)) {
2357                 printk(KERN_ERR
2358                         "ERROR: FC host '%s' attempted to flush work, "
2359                         "when no workqueue created.\n", shost->hostt->name);
2360                 dump_stack();
2361                 return;
2362         }
2363
2364         flush_workqueue(fc_host_work_q(shost));
2365 }
2366
2367 /**
2368  * fc_queue_devloss_work - Schedule work for the fc_host devloss workqueue.
2369  * @shost:      Pointer to Scsi_Host bound to fc_host.
2370  * @work:       Work to queue for execution.
2371  * @delay:      jiffies to delay the work queuing
2372  *
2373  * Return value:
2374  *      1 on success / 0 already queued / < 0 for error
2375  */
2376 static int
2377 fc_queue_devloss_work(struct Scsi_Host *shost, struct delayed_work *work,
2378                                 unsigned long delay)
2379 {
2380         if (unlikely(!fc_host_devloss_work_q(shost))) {
2381                 printk(KERN_ERR
2382                         "ERROR: FC host '%s' attempted to queue work, "
2383                         "when no workqueue created.\n", shost->hostt->name);
2384                 dump_stack();
2385
2386                 return -EINVAL;
2387         }
2388
2389         return queue_delayed_work(fc_host_devloss_work_q(shost), work, delay);
2390 }
2391
2392 /**
2393  * fc_flush_devloss - Flush a fc_host's devloss workqueue.
2394  * @shost:      Pointer to Scsi_Host bound to fc_host.
2395  */
2396 static void
2397 fc_flush_devloss(struct Scsi_Host *shost)
2398 {
2399         if (!fc_host_devloss_work_q(shost)) {
2400                 printk(KERN_ERR
2401                         "ERROR: FC host '%s' attempted to flush work, "
2402                         "when no workqueue created.\n", shost->hostt->name);
2403                 dump_stack();
2404                 return;
2405         }
2406
2407         flush_workqueue(fc_host_devloss_work_q(shost));
2408 }
2409
2410
2411 /**
2412  * fc_remove_host - called to terminate any fc_transport-related elements for a scsi host.
2413  * @shost:      Which &Scsi_Host
2414  *
2415  * This routine is expected to be called immediately preceding the
2416  * a driver's call to scsi_remove_host().
2417  *
2418  * WARNING: A driver utilizing the fc_transport, which fails to call
2419  *   this routine prior to scsi_remove_host(), will leave dangling
2420  *   objects in /sys/class/fc_remote_ports. Access to any of these
2421  *   objects can result in a system crash !!!
2422  *
2423  * Notes:
2424  *      This routine assumes no locks are held on entry.
2425  */
2426 void
2427 fc_remove_host(struct Scsi_Host *shost)
2428 {
2429         struct fc_vport *vport = NULL, *next_vport = NULL;
2430         struct fc_rport *rport = NULL, *next_rport = NULL;
2431         struct workqueue_struct *work_q;
2432         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2433         unsigned long flags;
2434
2435         spin_lock_irqsave(shost->host_lock, flags);
2436
2437         /* Remove any vports */
2438         list_for_each_entry_safe(vport, next_vport, &fc_host->vports, peers) {
2439                 vport->flags |= FC_VPORT_DELETING;
2440                 fc_queue_work(shost, &vport->vport_delete_work);
2441         }
2442
2443         /* Remove any remote ports */
2444         list_for_each_entry_safe(rport, next_rport,
2445                         &fc_host->rports, peers) {
2446                 list_del(&rport->peers);
2447                 rport->port_state = FC_PORTSTATE_DELETED;
2448                 fc_queue_work(shost, &rport->rport_delete_work);
2449         }
2450
2451         list_for_each_entry_safe(rport, next_rport,
2452                         &fc_host->rport_bindings, peers) {
2453                 list_del(&rport->peers);
2454                 rport->port_state = FC_PORTSTATE_DELETED;
2455                 fc_queue_work(shost, &rport->rport_delete_work);
2456         }
2457
2458         spin_unlock_irqrestore(shost->host_lock, flags);
2459
2460         /* flush all scan work items */
2461         scsi_flush_work(shost);
2462
2463         /* flush all stgt delete, and rport delete work items, then kill it  */
2464         if (fc_host->work_q) {
2465                 work_q = fc_host->work_q;
2466                 fc_host->work_q = NULL;
2467                 destroy_workqueue(work_q);
2468         }
2469
2470         /* flush all devloss work items, then kill it  */
2471         if (fc_host->devloss_work_q) {
2472                 work_q = fc_host->devloss_work_q;
2473                 fc_host->devloss_work_q = NULL;
2474                 destroy_workqueue(work_q);
2475         }
2476 }
2477 EXPORT_SYMBOL(fc_remove_host);
2478
2479 static void fc_terminate_rport_io(struct fc_rport *rport)
2480 {
2481         struct Scsi_Host *shost = rport_to_shost(rport);
2482         struct fc_internal *i = to_fc_internal(shost->transportt);
2483
2484         /* Involve the LLDD if possible to terminate all io on the rport. */
2485         if (i->f->terminate_rport_io)
2486                 i->f->terminate_rport_io(rport);
2487
2488         /*
2489          * Must unblock to flush queued IO. scsi-ml will fail incoming reqs.
2490          */
2491         scsi_target_unblock(&rport->dev, SDEV_TRANSPORT_OFFLINE);
2492 }
2493
2494 /**
2495  * fc_starget_delete - called to delete the scsi descendants of an rport
2496  * @work:       remote port to be operated on.
2497  *
2498  * Deletes target and all sdevs.
2499  */
2500 static void
2501 fc_starget_delete(struct work_struct *work)
2502 {
2503         struct fc_rport *rport =
2504                 container_of(work, struct fc_rport, stgt_delete_work);
2505
2506         fc_terminate_rport_io(rport);
2507         scsi_remove_target(&rport->dev);
2508 }
2509
2510
2511 /**
2512  * fc_rport_final_delete - finish rport termination and delete it.
2513  * @work:       remote port to be deleted.
2514  */
2515 static void
2516 fc_rport_final_delete(struct work_struct *work)
2517 {
2518         struct fc_rport *rport =
2519                 container_of(work, struct fc_rport, rport_delete_work);
2520         struct device *dev = &rport->dev;
2521         struct Scsi_Host *shost = rport_to_shost(rport);
2522         struct fc_internal *i = to_fc_internal(shost->transportt);
2523         unsigned long flags;
2524         int do_callback = 0;
2525
2526         fc_terminate_rport_io(rport);
2527
2528         /*
2529          * if a scan is pending, flush the SCSI Host work_q so that
2530          * that we can reclaim the rport scan work element.
2531          */
2532         if (rport->flags & FC_RPORT_SCAN_PENDING)
2533                 scsi_flush_work(shost);
2534
2535         /*
2536          * Cancel any outstanding timers. These should really exist
2537          * only when rmmod'ing the LLDD and we're asking for
2538          * immediate termination of the rports
2539          */
2540         spin_lock_irqsave(shost->host_lock, flags);
2541         if (rport->flags & FC_RPORT_DEVLOSS_PENDING) {
2542                 spin_unlock_irqrestore(shost->host_lock, flags);
2543                 if (!cancel_delayed_work(&rport->fail_io_work))
2544                         fc_flush_devloss(shost);
2545                 if (!cancel_delayed_work(&rport->dev_loss_work))
2546                         fc_flush_devloss(shost);
2547                 cancel_work_sync(&rport->scan_work);
2548                 spin_lock_irqsave(shost->host_lock, flags);
2549                 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
2550         }
2551         spin_unlock_irqrestore(shost->host_lock, flags);
2552
2553         /* Delete SCSI target and sdevs */
2554         if (rport->scsi_target_id != -1)
2555                 fc_starget_delete(&rport->stgt_delete_work);
2556
2557         /*
2558          * Notify the driver that the rport is now dead. The LLDD will
2559          * also guarantee that any communication to the rport is terminated
2560          *
2561          * Avoid this call if we already called it when we preserved the
2562          * rport for the binding.
2563          */
2564         spin_lock_irqsave(shost->host_lock, flags);
2565         if (!(rport->flags & FC_RPORT_DEVLOSS_CALLBK_DONE) &&
2566             (i->f->dev_loss_tmo_callbk)) {
2567                 rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
2568                 do_callback = 1;
2569         }
2570         spin_unlock_irqrestore(shost->host_lock, flags);
2571
2572         if (do_callback)
2573                 i->f->dev_loss_tmo_callbk(rport);
2574
2575         fc_bsg_remove(rport->rqst_q);
2576
2577         transport_remove_device(dev);
2578         device_del(dev);
2579         transport_destroy_device(dev);
2580         scsi_host_put(shost);                   /* for fc_host->rport list */
2581         put_device(dev);                        /* for self-reference */
2582 }
2583
2584
2585 /**
2586  * fc_remote_port_create - allocates and creates a remote FC port.
2587  * @shost:      scsi host the remote port is connected to.
2588  * @channel:    Channel on shost port connected to.
2589  * @ids:        The world wide names, fc address, and FC4 port
2590  *              roles for the remote port.
2591  *
2592  * Allocates and creates the remoter port structure, including the
2593  * class and sysfs creation.
2594  *
2595  * Notes:
2596  *      This routine assumes no locks are held on entry.
2597  */
2598 static struct fc_rport *
2599 fc_remote_port_create(struct Scsi_Host *shost, int channel,
2600                       struct fc_rport_identifiers  *ids)
2601 {
2602         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2603         struct fc_internal *fci = to_fc_internal(shost->transportt);
2604         struct fc_rport *rport;
2605         struct device *dev;
2606         unsigned long flags;
2607         int error;
2608         size_t size;
2609
2610         size = (sizeof(struct fc_rport) + fci->f->dd_fcrport_size);
2611         rport = kzalloc(size, GFP_KERNEL);
2612         if (unlikely(!rport)) {
2613                 printk(KERN_ERR "%s: allocation failure\n", __func__);
2614                 return NULL;
2615         }
2616
2617         rport->maxframe_size = -1;
2618         rport->supported_classes = FC_COS_UNSPECIFIED;
2619         rport->dev_loss_tmo = fc_host->dev_loss_tmo;
2620         memcpy(&rport->node_name, &ids->node_name, sizeof(rport->node_name));
2621         memcpy(&rport->port_name, &ids->port_name, sizeof(rport->port_name));
2622         rport->port_id = ids->port_id;
2623         rport->roles = ids->roles;
2624         rport->port_state = FC_PORTSTATE_ONLINE;
2625         if (fci->f->dd_fcrport_size)
2626                 rport->dd_data = &rport[1];
2627         rport->channel = channel;
2628         rport->fast_io_fail_tmo = -1;
2629
2630         INIT_DELAYED_WORK(&rport->dev_loss_work, fc_timeout_deleted_rport);
2631         INIT_DELAYED_WORK(&rport->fail_io_work, fc_timeout_fail_rport_io);
2632         INIT_WORK(&rport->scan_work, fc_scsi_scan_rport);
2633         INIT_WORK(&rport->stgt_delete_work, fc_starget_delete);
2634         INIT_WORK(&rport->rport_delete_work, fc_rport_final_delete);
2635
2636         spin_lock_irqsave(shost->host_lock, flags);
2637
2638         rport->number = fc_host->next_rport_number++;
2639         if ((rport->roles & FC_PORT_ROLE_FCP_TARGET) ||
2640             (rport->roles & FC_PORT_ROLE_FCP_DUMMY_INITIATOR))
2641                 rport->scsi_target_id = fc_host->next_target_id++;
2642         else
2643                 rport->scsi_target_id = -1;
2644         list_add_tail(&rport->peers, &fc_host->rports);
2645         scsi_host_get(shost);                   /* for fc_host->rport list */
2646
2647         spin_unlock_irqrestore(shost->host_lock, flags);
2648
2649         dev = &rport->dev;
2650         device_initialize(dev);                 /* takes self reference */
2651         dev->parent = get_device(&shost->shost_gendev); /* parent reference */
2652         dev->release = fc_rport_dev_release;
2653         dev_set_name(dev, "rport-%d:%d-%d",
2654                      shost->host_no, channel, rport->number);
2655         transport_setup_device(dev);
2656
2657         error = device_add(dev);
2658         if (error) {
2659                 printk(KERN_ERR "FC Remote Port device_add failed\n");
2660                 goto delete_rport;
2661         }
2662         transport_add_device(dev);
2663         transport_configure_device(dev);
2664
2665         fc_bsg_rportadd(shost, rport);
2666         /* ignore any bsg add error - we just can't do sgio */
2667
2668         if (rport->roles & FC_PORT_ROLE_FCP_TARGET) {
2669                 /* initiate a scan of the target */
2670                 rport->flags |= FC_RPORT_SCAN_PENDING;
2671                 scsi_queue_work(shost, &rport->scan_work);
2672         }
2673
2674         return rport;
2675
2676 delete_rport:
2677         transport_destroy_device(dev);
2678         spin_lock_irqsave(shost->host_lock, flags);
2679         list_del(&rport->peers);
2680         scsi_host_put(shost);                   /* for fc_host->rport list */
2681         spin_unlock_irqrestore(shost->host_lock, flags);
2682         put_device(dev->parent);
2683         kfree(rport);
2684         return NULL;
2685 }
2686
2687 /**
2688  * fc_remote_port_add - notify fc transport of the existence of a remote FC port.
2689  * @shost:      scsi host the remote port is connected to.
2690  * @channel:    Channel on shost port connected to.
2691  * @ids:        The world wide names, fc address, and FC4 port
2692  *              roles for the remote port.
2693  *
2694  * The LLDD calls this routine to notify the transport of the existence
2695  * of a remote port. The LLDD provides the unique identifiers (wwpn,wwn)
2696  * of the port, it's FC address (port_id), and the FC4 roles that are
2697  * active for the port.
2698  *
2699  * For ports that are FCP targets (aka scsi targets), the FC transport
2700  * maintains consistent target id bindings on behalf of the LLDD.
2701  * A consistent target id binding is an assignment of a target id to
2702  * a remote port identifier, which persists while the scsi host is
2703  * attached. The remote port can disappear, then later reappear, and
2704  * it's target id assignment remains the same. This allows for shifts
2705  * in FC addressing (if binding by wwpn or wwnn) with no apparent
2706  * changes to the scsi subsystem which is based on scsi host number and
2707  * target id values.  Bindings are only valid during the attachment of
2708  * the scsi host. If the host detaches, then later re-attaches, target
2709  * id bindings may change.
2710  *
2711  * This routine is responsible for returning a remote port structure.
2712  * The routine will search the list of remote ports it maintains
2713  * internally on behalf of consistent target id mappings. If found, the
2714  * remote port structure will be reused. Otherwise, a new remote port
2715  * structure will be allocated.
2716  *
2717  * Whenever a remote port is allocated, a new fc_remote_port class
2718  * device is created.
2719  *
2720  * Should not be called from interrupt context.
2721  *
2722  * Notes:
2723  *      This routine assumes no locks are held on entry.
2724  */
2725 struct fc_rport *
2726 fc_remote_port_add(struct Scsi_Host *shost, int channel,
2727         struct fc_rport_identifiers  *ids)
2728 {
2729         struct fc_internal *fci = to_fc_internal(shost->transportt);
2730         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2731         struct fc_rport *rport;
2732         unsigned long flags;
2733         int match = 0;
2734
2735         /* ensure any stgt delete functions are done */
2736         fc_flush_work(shost);
2737
2738         /*
2739          * Search the list of "active" rports, for an rport that has been
2740          * deleted, but we've held off the real delete while the target
2741          * is in a "blocked" state.
2742          */
2743         spin_lock_irqsave(shost->host_lock, flags);
2744
2745         list_for_each_entry(rport, &fc_host->rports, peers) {
2746
2747                 if ((rport->port_state == FC_PORTSTATE_BLOCKED ||
2748                      rport->port_state == FC_PORTSTATE_NOTPRESENT) &&
2749                         (rport->channel == channel)) {
2750
2751                         switch (fc_host->tgtid_bind_type) {
2752                         case FC_TGTID_BIND_BY_WWPN:
2753                         case FC_TGTID_BIND_NONE:
2754                                 if (rport->port_name == ids->port_name)
2755                                         match = 1;
2756                                 break;
2757                         case FC_TGTID_BIND_BY_WWNN:
2758                                 if (rport->node_name == ids->node_name)
2759                                         match = 1;
2760                                 break;
2761                         case FC_TGTID_BIND_BY_ID:
2762                                 if (rport->port_id == ids->port_id)
2763                                         match = 1;
2764                                 break;
2765                         }
2766
2767                         if (match) {
2768
2769                                 memcpy(&rport->node_name, &ids->node_name,
2770                                         sizeof(rport->node_name));
2771                                 memcpy(&rport->port_name, &ids->port_name,
2772                                         sizeof(rport->port_name));
2773                                 rport->port_id = ids->port_id;
2774
2775                                 rport->port_state = FC_PORTSTATE_ONLINE;
2776                                 rport->roles = ids->roles;
2777
2778                                 spin_unlock_irqrestore(shost->host_lock, flags);
2779
2780                                 if (fci->f->dd_fcrport_size)
2781                                         memset(rport->dd_data, 0,
2782                                                 fci->f->dd_fcrport_size);
2783
2784                                 /*
2785                                  * If we were not a target, cancel the
2786                                  * io terminate and rport timers, and
2787                                  * we're done.
2788                                  *
2789                                  * If we were a target, but our new role
2790                                  * doesn't indicate a target, leave the
2791                                  * timers running expecting the role to
2792                                  * change as the target fully logs in. If
2793                                  * it doesn't, the target will be torn down.
2794                                  *
2795                                  * If we were a target, and our role shows
2796                                  * we're still a target, cancel the timers
2797                                  * and kick off a scan.
2798                                  */
2799
2800                                 /* was a target, not in roles */
2801                                 if ((rport->scsi_target_id != -1) &&
2802                                     (!(ids->roles & FC_PORT_ROLE_FCP_TARGET)))
2803                                         return rport;
2804
2805                                 /*
2806                                  * Stop the fail io and dev_loss timers.
2807                                  * If they flush, the port_state will
2808                                  * be checked and will NOOP the function.
2809                                  */
2810                                 if (!cancel_delayed_work(&rport->fail_io_work))
2811                                         fc_flush_devloss(shost);
2812                                 if (!cancel_delayed_work(&rport->dev_loss_work))
2813                                         fc_flush_devloss(shost);
2814
2815                                 spin_lock_irqsave(shost->host_lock, flags);
2816
2817                                 rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
2818                                                   FC_RPORT_DEVLOSS_PENDING |
2819                                                   FC_RPORT_DEVLOSS_CALLBK_DONE);
2820
2821                                 spin_unlock_irqrestore(shost->host_lock, flags);
2822
2823                                 /* if target, initiate a scan */
2824                                 if (rport->scsi_target_id != -1) {
2825                                         scsi_target_unblock(&rport->dev,
2826                                                             SDEV_RUNNING);
2827                                         spin_lock_irqsave(shost->host_lock,
2828                                                           flags);
2829                                         rport->flags |= FC_RPORT_SCAN_PENDING;
2830                                         scsi_queue_work(shost,
2831                                                         &rport->scan_work);
2832                                         spin_unlock_irqrestore(shost->host_lock,
2833                                                         flags);
2834                                 }
2835
2836                                 fc_bsg_goose_queue(rport);
2837
2838                                 return rport;
2839                         }
2840                 }
2841         }
2842
2843         /*
2844          * Search the bindings array
2845          * Note: if never a FCP target, you won't be on this list
2846          */
2847         if (fc_host->tgtid_bind_type != FC_TGTID_BIND_NONE) {
2848
2849                 /* search for a matching consistent binding */
2850
2851                 list_for_each_entry(rport, &fc_host->rport_bindings,
2852                                         peers) {
2853                         if (rport->channel != channel)
2854                                 continue;
2855
2856                         switch (fc_host->tgtid_bind_type) {
2857                         case FC_TGTID_BIND_BY_WWPN:
2858                                 if (rport->port_name == ids->port_name)
2859                                         match = 1;
2860                                 break;
2861                         case FC_TGTID_BIND_BY_WWNN:
2862                                 if (rport->node_name == ids->node_name)
2863                                         match = 1;
2864                                 break;
2865                         case FC_TGTID_BIND_BY_ID:
2866                                 if (rport->port_id == ids->port_id)
2867                                         match = 1;
2868                                 break;
2869                         case FC_TGTID_BIND_NONE: /* to keep compiler happy */
2870                                 break;
2871                         }
2872
2873                         if (match) {
2874                                 list_move_tail(&rport->peers, &fc_host->rports);
2875                                 break;
2876                         }
2877                 }
2878
2879                 if (match) {
2880                         memcpy(&rport->node_name, &ids->node_name,
2881                                 sizeof(rport->node_name));
2882                         memcpy(&rport->port_name, &ids->port_name,
2883                                 sizeof(rport->port_name));
2884                         rport->port_id = ids->port_id;
2885                         rport->port_state = FC_PORTSTATE_ONLINE;
2886                         rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
2887
2888                         if (fci->f->dd_fcrport_size)
2889                                 memset(rport->dd_data, 0,
2890                                                 fci->f->dd_fcrport_size);
2891                         spin_unlock_irqrestore(shost->host_lock, flags);
2892
2893                         fc_remote_port_rolechg(rport, ids->roles);
2894                         return rport;
2895                 }
2896         }
2897
2898         spin_unlock_irqrestore(shost->host_lock, flags);
2899
2900         /* No consistent binding found - create new remote port entry */
2901         rport = fc_remote_port_create(shost, channel, ids);
2902
2903         return rport;
2904 }
2905 EXPORT_SYMBOL(fc_remote_port_add);
2906
2907
2908 /**
2909  * fc_remote_port_delete - notifies the fc transport that a remote port is no longer in existence.
2910  * @rport:      The remote port that no longer exists
2911  *
2912  * The LLDD calls this routine to notify the transport that a remote
2913  * port is no longer part of the topology. Note: Although a port
2914  * may no longer be part of the topology, it may persist in the remote
2915  * ports displayed by the fc_host. We do this under 2 conditions:
2916  *
2917  * 1) If the port was a scsi target, we delay its deletion by "blocking" it.
2918  *    This allows the port to temporarily disappear, then reappear without
2919  *    disrupting the SCSI device tree attached to it. During the "blocked"
2920  *    period the port will still exist.
2921  *
2922  * 2) If the port was a scsi target and disappears for longer than we
2923  *    expect, we'll delete the port and the tear down the SCSI device tree
2924  *    attached to it. However, we want to semi-persist the target id assigned
2925  *    to that port if it eventually does exist. The port structure will
2926  *    remain (although with minimal information) so that the target id
2927  *    bindings also remain.
2928  *
2929  * If the remote port is not an FCP Target, it will be fully torn down
2930  * and deallocated, including the fc_remote_port class device.
2931  *
2932  * If the remote port is an FCP Target, the port will be placed in a
2933  * temporary blocked state. From the LLDD's perspective, the rport no
2934  * longer exists. From the SCSI midlayer's perspective, the SCSI target
2935  * exists, but all sdevs on it are blocked from further I/O. The following
2936  * is then expected.
2937  *
2938  *   If the remote port does not return (signaled by a LLDD call to
2939  *   fc_remote_port_add()) within the dev_loss_tmo timeout, then the
2940  *   scsi target is removed - killing all outstanding i/o and removing the
2941  *   scsi devices attached to it. The port structure will be marked Not
2942  *   Present and be partially cleared, leaving only enough information to
2943  *   recognize the remote port relative to the scsi target id binding if
2944  *   it later appears.  The port will remain as long as there is a valid
2945  *   binding (e.g. until the user changes the binding type or unloads the
2946  *   scsi host with the binding).
2947  *
2948  *   If the remote port returns within the dev_loss_tmo value (and matches
2949  *   according to the target id binding type), the port structure will be
2950  *   reused. If it is no longer a SCSI target, the target will be torn
2951  *   down. If it continues to be a SCSI target, then the target will be
2952  *   unblocked (allowing i/o to be resumed), and a scan will be activated
2953  *   to ensure that all luns are detected.
2954  *
2955  * Called from normal process context only - cannot be called from interrupt.
2956  *
2957  * Notes:
2958  *      This routine assumes no locks are held on entry.
2959  */
2960 void
2961 fc_remote_port_delete(struct fc_rport  *rport)
2962 {
2963         struct Scsi_Host *shost = rport_to_shost(rport);
2964         unsigned long timeout = rport->dev_loss_tmo;
2965         unsigned long flags;
2966
2967         /*
2968          * No need to flush the fc_host work_q's, as all adds are synchronous.
2969          *
2970          * We do need to reclaim the rport scan work element, so eventually
2971          * (in fc_rport_final_delete()) we'll flush the scsi host work_q if
2972          * there's still a scan pending.
2973          */
2974
2975         spin_lock_irqsave(shost->host_lock, flags);
2976
2977         if (rport->port_state != FC_PORTSTATE_ONLINE) {
2978                 spin_unlock_irqrestore(shost->host_lock, flags);
2979                 return;
2980         }
2981
2982         /*
2983          * In the past, we if this was not an FCP-Target, we would
2984          * unconditionally just jump to deleting the rport.
2985          * However, rports can be used as node containers by the LLDD,
2986          * and its not appropriate to just terminate the rport at the
2987          * first sign of a loss in connectivity. The LLDD may want to
2988          * send ELS traffic to re-validate the login. If the rport is
2989          * immediately deleted, it makes it inappropriate for a node
2990          * container.
2991          * So... we now unconditionally wait dev_loss_tmo before
2992          * destroying an rport.
2993          */
2994
2995         rport->port_state = FC_PORTSTATE_BLOCKED;
2996
2997         rport->flags |= FC_RPORT_DEVLOSS_PENDING;
2998
2999         spin_unlock_irqrestore(shost->host_lock, flags);
3000
3001         scsi_target_block(&rport->dev);
3002
3003         /* see if we need to kill io faster than waiting for device loss */
3004         if ((rport->fast_io_fail_tmo != -1) &&
3005             (rport->fast_io_fail_tmo < timeout))
3006                 fc_queue_devloss_work(shost, &rport->fail_io_work,
3007                                         rport->fast_io_fail_tmo * HZ);
3008
3009         /* cap the length the devices can be blocked until they are deleted */
3010         fc_queue_devloss_work(shost, &rport->dev_loss_work, timeout * HZ);
3011 }
3012 EXPORT_SYMBOL(fc_remote_port_delete);
3013
3014 /**
3015  * fc_remote_port_rolechg - notifies the fc transport that the roles on a remote may have changed.
3016  * @rport:      The remote port that changed.
3017  * @roles:      New roles for this port.
3018  *
3019  * Description: The LLDD calls this routine to notify the transport that the
3020  * roles on a remote port may have changed. The largest effect of this is
3021  * if a port now becomes a FCP Target, it must be allocated a
3022  * scsi target id.  If the port is no longer a FCP target, any
3023  * scsi target id value assigned to it will persist in case the
3024  * role changes back to include FCP Target. No changes in the scsi
3025  * midlayer will be invoked if the role changes (in the expectation
3026  * that the role will be resumed. If it doesn't normal error processing
3027  * will take place).
3028  *
3029  * Should not be called from interrupt context.
3030  *
3031  * Notes:
3032  *      This routine assumes no locks are held on entry.
3033  */
3034 void
3035 fc_remote_port_rolechg(struct fc_rport  *rport, u32 roles)
3036 {
3037         struct Scsi_Host *shost = rport_to_shost(rport);
3038         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3039         unsigned long flags;
3040         int create = 0;
3041
3042         spin_lock_irqsave(shost->host_lock, flags);
3043         if (roles & FC_PORT_ROLE_FCP_TARGET) {
3044                 if (rport->scsi_target_id == -1) {
3045                         rport->scsi_target_id = fc_host->next_target_id++;
3046                         create = 1;
3047                 } else if (!(rport->roles & FC_PORT_ROLE_FCP_TARGET))
3048                         create = 1;
3049         }
3050
3051         rport->roles = roles;
3052
3053         spin_unlock_irqrestore(shost->host_lock, flags);
3054
3055         if (create) {
3056                 /*
3057                  * There may have been a delete timer running on the
3058                  * port. Ensure that it is cancelled as we now know
3059                  * the port is an FCP Target.
3060                  * Note: we know the rport exists and is in an online
3061                  *  state as the LLDD would not have had an rport
3062                  *  reference to pass us.
3063                  *
3064                  * Take no action on the del_timer failure as the state
3065                  * machine state change will validate the
3066                  * transaction.
3067                  */
3068                 if (!cancel_delayed_work(&rport->fail_io_work))
3069                         fc_flush_devloss(shost);
3070                 if (!cancel_delayed_work(&rport->dev_loss_work))
3071                         fc_flush_devloss(shost);
3072
3073                 spin_lock_irqsave(shost->host_lock, flags);
3074                 rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
3075                                   FC_RPORT_DEVLOSS_PENDING |
3076                                   FC_RPORT_DEVLOSS_CALLBK_DONE);
3077                 spin_unlock_irqrestore(shost->host_lock, flags);
3078
3079                 /* ensure any stgt delete functions are done */
3080                 fc_flush_work(shost);
3081
3082                 scsi_target_unblock(&rport->dev, SDEV_RUNNING);
3083                 /* initiate a scan of the target */
3084                 spin_lock_irqsave(shost->host_lock, flags);
3085                 rport->flags |= FC_RPORT_SCAN_PENDING;
3086                 scsi_queue_work(shost, &rport->scan_work);
3087                 spin_unlock_irqrestore(shost->host_lock, flags);
3088         }
3089 }
3090 EXPORT_SYMBOL(fc_remote_port_rolechg);
3091
3092 /**
3093  * fc_timeout_deleted_rport - Timeout handler for a deleted remote port.
3094  * @work:       rport target that failed to reappear in the allotted time.
3095  *
3096  * Description: An attempt to delete a remote port blocks, and if it fails
3097  *              to return in the allotted time this gets called.
3098  */
3099 static void
3100 fc_timeout_deleted_rport(struct work_struct *work)
3101 {
3102         struct fc_rport *rport =
3103                 container_of(work, struct fc_rport, dev_loss_work.work);
3104         struct Scsi_Host *shost = rport_to_shost(rport);
3105         struct fc_internal *i = to_fc_internal(shost->transportt);
3106         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3107         unsigned long flags;
3108         int do_callback = 0;
3109
3110         spin_lock_irqsave(shost->host_lock, flags);
3111
3112         rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
3113
3114         /*
3115          * If the port is ONLINE, then it came back. If it was a SCSI
3116          * target, validate it still is. If not, tear down the
3117          * scsi_target on it.
3118          */
3119         if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
3120             (rport->scsi_target_id != -1) &&
3121             !(rport->roles & FC_PORT_ROLE_FCP_TARGET)) {
3122                 dev_printk(KERN_ERR, &rport->dev,
3123                         "blocked FC remote port time out: no longer"
3124                         " a FCP target, removing starget\n");
3125                 spin_unlock_irqrestore(shost->host_lock, flags);
3126                 scsi_target_unblock(&rport->dev, SDEV_TRANSPORT_OFFLINE);
3127                 fc_queue_work(shost, &rport->stgt_delete_work);
3128                 return;
3129         }
3130
3131         /* NOOP state - we're flushing workq's */
3132         if (rport->port_state != FC_PORTSTATE_BLOCKED) {
3133                 spin_unlock_irqrestore(shost->host_lock, flags);
3134                 dev_printk(KERN_ERR, &rport->dev,
3135                         "blocked FC remote port time out: leaving"
3136                         " rport%s alone\n",
3137                         (rport->scsi_target_id != -1) ?  " and starget" : "");
3138                 return;
3139         }
3140
3141         if ((fc_host->tgtid_bind_type == FC_TGTID_BIND_NONE) ||
3142             (rport->scsi_target_id == -1)) {
3143                 list_del(&rport->peers);
3144                 rport->port_state = FC_PORTSTATE_DELETED;
3145                 dev_printk(KERN_ERR, &rport->dev,
3146                         "blocked FC remote port time out: removing"
3147                         " rport%s\n",
3148                         (rport->scsi_target_id != -1) ?  " and starget" : "");
3149                 fc_queue_work(shost, &rport->rport_delete_work);
3150                 spin_unlock_irqrestore(shost->host_lock, flags);
3151                 return;
3152         }
3153
3154         dev_printk(KERN_ERR, &rport->dev,
3155                 "blocked FC remote port time out: removing target and "
3156                 "saving binding\n");
3157
3158         list_move_tail(&rport->peers, &fc_host->rport_bindings);
3159
3160         /*
3161          * Note: We do not remove or clear the hostdata area. This allows
3162          *   host-specific target data to persist along with the
3163          *   scsi_target_id. It's up to the host to manage it's hostdata area.
3164          */
3165
3166         /*
3167          * Reinitialize port attributes that may change if the port comes back.
3168          */
3169         rport->maxframe_size = -1;
3170         rport->supported_classes = FC_COS_UNSPECIFIED;
3171         rport->roles = FC_PORT_ROLE_UNKNOWN;
3172         rport->port_state = FC_PORTSTATE_NOTPRESENT;
3173         rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
3174
3175         /*
3176          * Pre-emptively kill I/O rather than waiting for the work queue
3177          * item to teardown the starget. (FCOE libFC folks prefer this
3178          * and to have the rport_port_id still set when it's done).
3179          */
3180         spin_unlock_irqrestore(shost->host_lock, flags);
3181         fc_terminate_rport_io(rport);
3182
3183         spin_lock_irqsave(shost->host_lock, flags);
3184
3185         if (rport->port_state == FC_PORTSTATE_NOTPRESENT) {     /* still missing */
3186
3187                 /* remove the identifiers that aren't used in the consisting binding */
3188                 switch (fc_host->tgtid_bind_type) {
3189                 case FC_TGTID_BIND_BY_WWPN:
3190                         rport->node_name = -1;
3191                         rport->port_id = -1;
3192                         break;
3193                 case FC_TGTID_BIND_BY_WWNN:
3194                         rport->port_name = -1;
3195                         rport->port_id = -1;
3196                         break;
3197                 case FC_TGTID_BIND_BY_ID:
3198                         rport->node_name = -1;
3199                         rport->port_name = -1;
3200                         break;
3201                 case FC_TGTID_BIND_NONE:        /* to keep compiler happy */
3202                         break;
3203                 }
3204
3205                 /*
3206                  * As this only occurs if the remote port (scsi target)
3207                  * went away and didn't come back - we'll remove
3208                  * all attached scsi devices.
3209                  */
3210                 rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
3211                 fc_queue_work(shost, &rport->stgt_delete_work);
3212
3213                 do_callback = 1;
3214         }
3215
3216         spin_unlock_irqrestore(shost->host_lock, flags);
3217
3218         /*
3219          * Notify the driver that the rport is now dead. The LLDD will
3220          * also guarantee that any communication to the rport is terminated
3221          *
3222          * Note: we set the CALLBK_DONE flag above to correspond
3223          */
3224         if (do_callback && i->f->dev_loss_tmo_callbk)
3225                 i->f->dev_loss_tmo_callbk(rport);
3226 }
3227
3228
3229 /**
3230  * fc_timeout_fail_rport_io - Timeout handler for a fast io failing on a disconnected SCSI target.
3231  * @work:       rport to terminate io on.
3232  *
3233  * Notes: Only requests the failure of the io, not that all are flushed
3234  *    prior to returning.
3235  */
3236 static void
3237 fc_timeout_fail_rport_io(struct work_struct *work)
3238 {
3239         struct fc_rport *rport =
3240                 container_of(work, struct fc_rport, fail_io_work.work);
3241
3242         if (rport->port_state != FC_PORTSTATE_BLOCKED)
3243                 return;
3244
3245         rport->flags |= FC_RPORT_FAST_FAIL_TIMEDOUT;
3246         fc_terminate_rport_io(rport);
3247 }
3248
3249 /**
3250  * fc_scsi_scan_rport - called to perform a scsi scan on a remote port.
3251  * @work:       remote port to be scanned.
3252  */
3253 static void
3254 fc_scsi_scan_rport(struct work_struct *work)
3255 {
3256         struct fc_rport *rport =
3257                 container_of(work, struct fc_rport, scan_work);
3258         struct Scsi_Host *shost = rport_to_shost(rport);
3259         struct fc_internal *i = to_fc_internal(shost->transportt);
3260         unsigned long flags;
3261
3262         if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
3263             (rport->roles & FC_PORT_ROLE_FCP_TARGET) &&
3264             !(i->f->disable_target_scan)) {
3265                 scsi_scan_target(&rport->dev, rport->channel,
3266                                  rport->scsi_target_id, SCAN_WILD_CARD,
3267                                  SCSI_SCAN_RESCAN);
3268         }
3269
3270         spin_lock_irqsave(shost->host_lock, flags);
3271         rport->flags &= ~FC_RPORT_SCAN_PENDING;
3272         spin_unlock_irqrestore(shost->host_lock, flags);
3273 }
3274
3275 /**
3276  * fc_block_rport() - Block SCSI eh thread for blocked fc_rport.
3277  * @rport: Remote port that scsi_eh is trying to recover.
3278  *
3279  * This routine can be called from a FC LLD scsi_eh callback. It
3280  * blocks the scsi_eh thread until the fc_rport leaves the
3281  * FC_PORTSTATE_BLOCKED, or the fast_io_fail_tmo fires. This is
3282  * necessary to avoid the scsi_eh failing recovery actions for blocked
3283  * rports which would lead to offlined SCSI devices.
3284  *
3285  * Returns: 0 if the fc_rport left the state FC_PORTSTATE_BLOCKED.
3286  *          FAST_IO_FAIL if the fast_io_fail_tmo fired, this should be
3287  *          passed back to scsi_eh.
3288  */
3289 int fc_block_rport(struct fc_rport *rport)
3290 {
3291         struct Scsi_Host *shost = rport_to_shost(rport);
3292         unsigned long flags;
3293
3294         spin_lock_irqsave(shost->host_lock, flags);
3295         while (rport->port_state == FC_PORTSTATE_BLOCKED &&
3296                !(rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT)) {
3297                 spin_unlock_irqrestore(shost->host_lock, flags);
3298                 msleep(1000);
3299                 spin_lock_irqsave(shost->host_lock, flags);
3300         }
3301         spin_unlock_irqrestore(shost->host_lock, flags);
3302
3303         if (rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT)
3304                 return FAST_IO_FAIL;
3305
3306         return 0;
3307 }
3308 EXPORT_SYMBOL(fc_block_rport);
3309
3310 /**
3311  * fc_block_scsi_eh - Block SCSI eh thread for blocked fc_rport
3312  * @cmnd: SCSI command that scsi_eh is trying to recover
3313  *
3314  * This routine can be called from a FC LLD scsi_eh callback. It
3315  * blocks the scsi_eh thread until the fc_rport leaves the
3316  * FC_PORTSTATE_BLOCKED, or the fast_io_fail_tmo fires. This is
3317  * necessary to avoid the scsi_eh failing recovery actions for blocked
3318  * rports which would lead to offlined SCSI devices.
3319  *
3320  * Returns: 0 if the fc_rport left the state FC_PORTSTATE_BLOCKED.
3321  *          FAST_IO_FAIL if the fast_io_fail_tmo fired, this should be
3322  *          passed back to scsi_eh.
3323  */
3324 int fc_block_scsi_eh(struct scsi_cmnd *cmnd)
3325 {
3326         struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
3327
3328         if (WARN_ON_ONCE(!rport))
3329                 return FAST_IO_FAIL;
3330
3331         return fc_block_rport(rport);
3332 }
3333 EXPORT_SYMBOL(fc_block_scsi_eh);
3334
3335 /**
3336  * fc_vport_setup - allocates and creates a FC virtual port.
3337  * @shost:      scsi host the virtual port is connected to.
3338  * @channel:    Channel on shost port connected to.
3339  * @pdev:       parent device for vport
3340  * @ids:        The world wide names, FC4 port roles, etc for
3341  *              the virtual port.
3342  * @ret_vport:  The pointer to the created vport.
3343  *
3344  * Allocates and creates the vport structure, calls the parent host
3345  * to instantiate the vport, this completes w/ class and sysfs creation.
3346  *
3347  * Notes:
3348  *      This routine assumes no locks are held on entry.
3349  */
3350 static int
3351 fc_vport_setup(struct Scsi_Host *shost, int channel, struct device *pdev,
3352         struct fc_vport_identifiers  *ids, struct fc_vport **ret_vport)
3353 {
3354         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3355         struct fc_internal *fci = to_fc_internal(shost->transportt);
3356         struct fc_vport *vport;
3357         struct device *dev;
3358         unsigned long flags;
3359         size_t size;
3360         int error;
3361
3362         *ret_vport = NULL;
3363
3364         if ( ! fci->f->vport_create)
3365                 return -ENOENT;
3366
3367         size = (sizeof(struct fc_vport) + fci->f->dd_fcvport_size);
3368         vport = kzalloc(size, GFP_KERNEL);
3369         if (unlikely(!vport)) {
3370                 printk(KERN_ERR "%s: allocation failure\n", __func__);
3371                 return -ENOMEM;
3372         }
3373
3374         vport->vport_state = FC_VPORT_UNKNOWN;
3375         vport->vport_last_state = FC_VPORT_UNKNOWN;
3376         vport->node_name = ids->node_name;
3377         vport->port_name = ids->port_name;
3378         vport->roles = ids->roles;
3379         vport->vport_type = ids->vport_type;
3380         if (fci->f->dd_fcvport_size)
3381                 vport->dd_data = &vport[1];
3382         vport->shost = shost;
3383         vport->channel = channel;
3384         vport->flags = FC_VPORT_CREATING;
3385         INIT_WORK(&vport->vport_delete_work, fc_vport_sched_delete);
3386
3387         spin_lock_irqsave(shost->host_lock, flags);
3388
3389         if (fc_host->npiv_vports_inuse >= fc_host->max_npiv_vports) {
3390                 spin_unlock_irqrestore(shost->host_lock, flags);
3391                 kfree(vport);
3392                 return -ENOSPC;
3393         }
3394         fc_host->npiv_vports_inuse++;
3395         vport->number = fc_host->next_vport_number++;
3396         list_add_tail(&vport->peers, &fc_host->vports);
3397         scsi_host_get(shost);                   /* for fc_host->vport list */
3398
3399         spin_unlock_irqrestore(shost->host_lock, flags);
3400
3401         dev = &vport->dev;
3402         device_initialize(dev);                 /* takes self reference */
3403         dev->parent = get_device(pdev);         /* takes parent reference */
3404         dev->release = fc_vport_dev_release;
3405         dev_set_name(dev, "vport-%d:%d-%d",
3406                      shost->host_no, channel, vport->number);
3407         transport_setup_device(dev);
3408
3409         error = device_add(dev);
3410         if (error) {
3411                 printk(KERN_ERR "FC Virtual Port device_add failed\n");
3412                 goto delete_vport;
3413         }
3414         transport_add_device(dev);
3415         transport_configure_device(dev);
3416
3417         error = fci->f->vport_create(vport, ids->disable);
3418         if (error) {
3419                 printk(KERN_ERR "FC Virtual Port LLDD Create failed\n");
3420                 goto delete_vport_all;
3421         }
3422
3423         /*
3424          * if the parent isn't the physical adapter's Scsi_Host, ensure
3425          * the Scsi_Host at least contains a symlink to the vport.
3426          */
3427         if (pdev != &shost->shost_gendev) {
3428                 error = sysfs_create_link(&shost->shost_gendev.kobj,
3429                                  &dev->kobj, dev_name(dev));
3430                 if (error)
3431                         printk(KERN_ERR
3432                                 "%s: Cannot create vport symlinks for "
3433                                 "%s, err=%d\n",
3434                                 __func__, dev_name(dev), error);
3435         }
3436         spin_lock_irqsave(shost->host_lock, flags);
3437         vport->flags &= ~FC_VPORT_CREATING;
3438         spin_unlock_irqrestore(shost->host_lock, flags);
3439
3440         dev_printk(KERN_NOTICE, pdev,
3441                         "%s created via shost%d channel %d\n", dev_name(dev),
3442                         shost->host_no, channel);
3443
3444         *ret_vport = vport;
3445
3446         return 0;
3447
3448 delete_vport_all:
3449         transport_remove_device(dev);
3450         device_del(dev);
3451 delete_vport:
3452         transport_destroy_device(dev);
3453         spin_lock_irqsave(shost->host_lock, flags);
3454         list_del(&vport->peers);
3455         scsi_host_put(shost);                   /* for fc_host->vport list */
3456         fc_host->npiv_vports_inuse--;
3457         spin_unlock_irqrestore(shost->host_lock, flags);
3458         put_device(dev->parent);
3459         kfree(vport);
3460
3461         return error;
3462 }
3463
3464 /**
3465  * fc_vport_create - Admin App or LLDD requests creation of a vport
3466  * @shost:      scsi host the virtual port is connected to.
3467  * @channel:    channel on shost port connected to.
3468  * @ids:        The world wide names, FC4 port roles, etc for
3469  *              the virtual port.
3470  *
3471  * Notes:
3472  *      This routine assumes no locks are held on entry.
3473  */
3474 struct fc_vport *
3475 fc_vport_create(struct Scsi_Host *shost, int channel,
3476         struct fc_vport_identifiers *ids)
3477 {
3478         int stat;
3479         struct fc_vport *vport;
3480
3481         stat = fc_vport_setup(shost, channel, &shost->shost_gendev,
3482                  ids, &vport);
3483         return stat ? NULL : vport;
3484 }
3485 EXPORT_SYMBOL(fc_vport_create);
3486
3487 /**
3488  * fc_vport_terminate - Admin App or LLDD requests termination of a vport
3489  * @vport:      fc_vport to be terminated
3490  *
3491  * Calls the LLDD vport_delete() function, then deallocates and removes
3492  * the vport from the shost and object tree.
3493  *
3494  * Notes:
3495  *      This routine assumes no locks are held on entry.
3496  */
3497 int
3498 fc_vport_terminate(struct fc_vport *vport)
3499 {
3500         struct Scsi_Host *shost = vport_to_shost(vport);
3501         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3502         struct fc_internal *i = to_fc_internal(shost->transportt);
3503         struct device *dev = &vport->dev;
3504         unsigned long flags;
3505         int stat;
3506
3507         if (i->f->vport_delete)
3508                 stat = i->f->vport_delete(vport);
3509         else
3510                 stat = -ENOENT;
3511
3512         spin_lock_irqsave(shost->host_lock, flags);
3513         vport->flags &= ~FC_VPORT_DELETING;
3514         if (!stat) {
3515                 vport->flags |= FC_VPORT_DELETED;
3516                 list_del(&vport->peers);
3517                 fc_host->npiv_vports_inuse--;
3518                 scsi_host_put(shost);           /* for fc_host->vport list */
3519         }
3520         spin_unlock_irqrestore(shost->host_lock, flags);
3521
3522         if (stat)
3523                 return stat;
3524
3525         if (dev->parent != &shost->shost_gendev)
3526                 sysfs_remove_link(&shost->shost_gendev.kobj, dev_name(dev));
3527         transport_remove_device(dev);
3528         device_del(dev);
3529         transport_destroy_device(dev);
3530
3531         /*
3532          * Removing our self-reference should mean our
3533          * release function gets called, which will drop the remaining
3534          * parent reference and free the data structure.
3535          */
3536         put_device(dev);                        /* for self-reference */
3537
3538         return 0; /* SUCCESS */
3539 }
3540 EXPORT_SYMBOL(fc_vport_terminate);
3541
3542 /**
3543  * fc_vport_sched_delete - workq-based delete request for a vport
3544  * @work:       vport to be deleted.
3545  */
3546 static void
3547 fc_vport_sched_delete(struct work_struct *work)
3548 {
3549         struct fc_vport *vport =
3550                 container_of(work, struct fc_vport, vport_delete_work);
3551         int stat;
3552
3553         stat = fc_vport_terminate(vport);
3554         if (stat)
3555                 dev_printk(KERN_ERR, vport->dev.parent,
3556                         "%s: %s could not be deleted created via "
3557                         "shost%d channel %d - error %d\n", __func__,
3558                         dev_name(&vport->dev), vport->shost->host_no,
3559                         vport->channel, stat);
3560 }
3561
3562
3563 /*
3564  * BSG support
3565  */
3566
3567 /**
3568  * fc_bsg_job_timeout - handler for when a bsg request timesout
3569  * @req:        request that timed out
3570  */
3571 static enum blk_eh_timer_return
3572 fc_bsg_job_timeout(struct request *req)
3573 {
3574         struct bsg_job *job = blk_mq_rq_to_pdu(req);
3575         struct Scsi_Host *shost = fc_bsg_to_shost(job);
3576         struct fc_rport *rport = fc_bsg_to_rport(job);
3577         struct fc_internal *i = to_fc_internal(shost->transportt);
3578         int err = 0, inflight = 0;
3579
3580         if (rport && rport->port_state == FC_PORTSTATE_BLOCKED)
3581                 return BLK_EH_RESET_TIMER;
3582
3583         inflight = bsg_job_get(job);
3584
3585         if (inflight && i->f->bsg_timeout) {
3586                 /* call LLDD to abort the i/o as it has timed out */
3587                 err = i->f->bsg_timeout(job);
3588                 if (err == -EAGAIN) {
3589                         bsg_job_put(job);
3590                         return BLK_EH_RESET_TIMER;
3591                 } else if (err)
3592                         printk(KERN_ERR "ERROR: FC BSG request timeout - LLD "
3593                                 "abort failed with status %d\n", err);
3594         }
3595
3596         /* the blk_end_sync_io() doesn't check the error */
3597         if (inflight)
3598                 blk_mq_end_request(req, BLK_STS_IOERR);
3599         return BLK_EH_DONE;
3600 }
3601
3602 /**
3603  * fc_bsg_host_dispatch - process fc host bsg requests and dispatch to LLDD
3604  * @shost:      scsi host rport attached to
3605  * @job:        bsg job to be processed
3606  */
3607 static int fc_bsg_host_dispatch(struct Scsi_Host *shost, struct bsg_job *job)
3608 {
3609         struct fc_internal *i = to_fc_internal(shost->transportt);
3610         struct fc_bsg_request *bsg_request = job->request;
3611         struct fc_bsg_reply *bsg_reply = job->reply;
3612         int cmdlen = sizeof(uint32_t);  /* start with length of msgcode */
3613         int ret;
3614
3615         /* check if we really have all the request data needed */
3616         if (job->request_len < cmdlen) {
3617                 ret = -ENOMSG;
3618                 goto fail_host_msg;
3619         }
3620
3621         /* Validate the host command */
3622         switch (bsg_request->msgcode) {
3623         case FC_BSG_HST_ADD_RPORT:
3624                 cmdlen += sizeof(struct fc_bsg_host_add_rport);
3625                 break;
3626
3627         case FC_BSG_HST_DEL_RPORT:
3628                 cmdlen += sizeof(struct fc_bsg_host_del_rport);
3629                 break;
3630
3631         case FC_BSG_HST_ELS_NOLOGIN:
3632                 cmdlen += sizeof(struct fc_bsg_host_els);
3633                 /* there better be a xmt and rcv payloads */
3634                 if ((!job->request_payload.payload_len) ||
3635                     (!job->reply_payload.payload_len)) {
3636                         ret = -EINVAL;
3637                         goto fail_host_msg;
3638                 }
3639                 break;
3640
3641         case FC_BSG_HST_CT:
3642                 cmdlen += sizeof(struct fc_bsg_host_ct);
3643                 /* there better be xmt and rcv payloads */
3644                 if ((!job->request_payload.payload_len) ||
3645                     (!job->reply_payload.payload_len)) {
3646                         ret = -EINVAL;
3647                         goto fail_host_msg;
3648                 }
3649                 break;
3650
3651         case FC_BSG_HST_VENDOR:
3652                 cmdlen += sizeof(struct fc_bsg_host_vendor);
3653                 if ((shost->hostt->vendor_id == 0L) ||
3654                     (bsg_request->rqst_data.h_vendor.vendor_id !=
3655                         shost->hostt->vendor_id)) {
3656                         ret = -ESRCH;
3657                         goto fail_host_msg;
3658                 }
3659                 break;
3660
3661         default:
3662                 ret = -EBADR;
3663                 goto fail_host_msg;
3664         }
3665
3666         ret = i->f->bsg_request(job);
3667         if (!ret)
3668                 return 0;
3669
3670 fail_host_msg:
3671         /* return the errno failure code as the only status */
3672         BUG_ON(job->reply_len < sizeof(uint32_t));
3673         bsg_reply->reply_payload_rcv_len = 0;
3674         bsg_reply->result = ret;
3675         job->reply_len = sizeof(uint32_t);
3676         bsg_job_done(job, bsg_reply->result,
3677                        bsg_reply->reply_payload_rcv_len);
3678         return 0;
3679 }
3680
3681
3682 /*
3683  * fc_bsg_goose_queue - restart rport queue in case it was stopped
3684  * @rport:      rport to be restarted
3685  */
3686 static void
3687 fc_bsg_goose_queue(struct fc_rport *rport)
3688 {
3689         struct request_queue *q = rport->rqst_q;
3690
3691         if (q)
3692                 blk_mq_run_hw_queues(q, true);
3693 }
3694
3695 /**
3696  * fc_bsg_rport_dispatch - process rport bsg requests and dispatch to LLDD
3697  * @shost:      scsi host rport attached to
3698  * @job:        bsg job to be processed
3699  */
3700 static int fc_bsg_rport_dispatch(struct Scsi_Host *shost, struct bsg_job *job)
3701 {
3702         struct fc_internal *i = to_fc_internal(shost->transportt);
3703         struct fc_bsg_request *bsg_request = job->request;
3704         struct fc_bsg_reply *bsg_reply = job->reply;
3705         int cmdlen = sizeof(uint32_t);  /* start with length of msgcode */
3706         int ret;
3707
3708         /* check if we really have all the request data needed */
3709         if (job->request_len < cmdlen) {
3710                 ret = -ENOMSG;
3711                 goto fail_rport_msg;
3712         }
3713
3714         /* Validate the rport command */
3715         switch (bsg_request->msgcode) {
3716         case FC_BSG_RPT_ELS:
3717                 cmdlen += sizeof(struct fc_bsg_rport_els);
3718                 goto check_bidi;
3719
3720         case FC_BSG_RPT_CT:
3721                 cmdlen += sizeof(struct fc_bsg_rport_ct);
3722 check_bidi:
3723                 /* there better be xmt and rcv payloads */
3724                 if ((!job->request_payload.payload_len) ||
3725                     (!job->reply_payload.payload_len)) {
3726                         ret = -EINVAL;
3727                         goto fail_rport_msg;
3728                 }
3729                 break;
3730         default:
3731                 ret = -EBADR;
3732                 goto fail_rport_msg;
3733         }
3734
3735         ret = i->f->bsg_request(job);
3736         if (!ret)
3737                 return 0;
3738
3739 fail_rport_msg:
3740         /* return the errno failure code as the only status */
3741         BUG_ON(job->reply_len < sizeof(uint32_t));
3742         bsg_reply->reply_payload_rcv_len = 0;
3743         bsg_reply->result = ret;
3744         job->reply_len = sizeof(uint32_t);
3745         bsg_job_done(job, bsg_reply->result,
3746                        bsg_reply->reply_payload_rcv_len);
3747         return 0;
3748 }
3749
3750 static int fc_bsg_dispatch(struct bsg_job *job)
3751 {
3752         struct Scsi_Host *shost = fc_bsg_to_shost(job);
3753
3754         if (scsi_is_fc_rport(job->dev))
3755                 return fc_bsg_rport_dispatch(shost, job);
3756         else
3757                 return fc_bsg_host_dispatch(shost, job);
3758 }
3759
3760 static blk_status_t fc_bsg_rport_prep(struct fc_rport *rport)
3761 {
3762         if (rport->port_state == FC_PORTSTATE_BLOCKED &&
3763             !(rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT))
3764                 return BLK_STS_RESOURCE;
3765
3766         if (rport->port_state != FC_PORTSTATE_ONLINE)
3767                 return BLK_STS_IOERR;
3768
3769         return BLK_STS_OK;
3770 }
3771
3772
3773 static int fc_bsg_dispatch_prep(struct bsg_job *job)
3774 {
3775         struct fc_rport *rport = fc_bsg_to_rport(job);
3776         blk_status_t ret;
3777
3778         ret = fc_bsg_rport_prep(rport);
3779         switch (ret) {
3780         case BLK_STS_OK:
3781                 break;
3782         case BLK_STS_RESOURCE:
3783                 return -EAGAIN;
3784         default:
3785                 return -EIO;
3786         }
3787
3788         return fc_bsg_dispatch(job);
3789 }
3790
3791 /**
3792  * fc_bsg_hostadd - Create and add the bsg hooks so we can receive requests
3793  * @shost:      shost for fc_host
3794  * @fc_host:    fc_host adding the structures to
3795  */
3796 static int
3797 fc_bsg_hostadd(struct Scsi_Host *shost, struct fc_host_attrs *fc_host)
3798 {
3799         struct device *dev = &shost->shost_gendev;
3800         struct fc_internal *i = to_fc_internal(shost->transportt);
3801         struct request_queue *q;
3802         char bsg_name[20];
3803
3804         fc_host->rqst_q = NULL;
3805
3806         if (!i->f->bsg_request)
3807                 return -ENOTSUPP;
3808
3809         snprintf(bsg_name, sizeof(bsg_name),
3810                  "fc_host%d", shost->host_no);
3811
3812         q = bsg_setup_queue(dev, bsg_name, fc_bsg_dispatch, fc_bsg_job_timeout,
3813                                 i->f->dd_bsg_size);
3814         if (IS_ERR(q)) {
3815                 dev_err(dev,
3816                         "fc_host%d: bsg interface failed to initialize - setup queue\n",
3817                         shost->host_no);
3818                 return PTR_ERR(q);
3819         }
3820         __scsi_init_queue(shost, q);
3821         blk_queue_rq_timeout(q, FC_DEFAULT_BSG_TIMEOUT);
3822         fc_host->rqst_q = q;
3823         return 0;
3824 }
3825
3826 /**
3827  * fc_bsg_rportadd - Create and add the bsg hooks so we can receive requests
3828  * @shost:      shost that rport is attached to
3829  * @rport:      rport that the bsg hooks are being attached to
3830  */
3831 static int
3832 fc_bsg_rportadd(struct Scsi_Host *shost, struct fc_rport *rport)
3833 {
3834         struct device *dev = &rport->dev;
3835         struct fc_internal *i = to_fc_internal(shost->transportt);
3836         struct request_queue *q;
3837
3838         rport->rqst_q = NULL;
3839
3840         if (!i->f->bsg_request)
3841                 return -ENOTSUPP;
3842
3843         q = bsg_setup_queue(dev, dev_name(dev), fc_bsg_dispatch_prep,
3844                                 fc_bsg_job_timeout, i->f->dd_bsg_size);
3845         if (IS_ERR(q)) {
3846                 dev_err(dev, "failed to setup bsg queue\n");
3847                 return PTR_ERR(q);
3848         }
3849         __scsi_init_queue(shost, q);
3850         blk_queue_rq_timeout(q, BLK_DEFAULT_SG_TIMEOUT);
3851         rport->rqst_q = q;
3852         return 0;
3853 }
3854
3855
3856 /**
3857  * fc_bsg_remove - Deletes the bsg hooks on fchosts/rports
3858  * @q:  the request_queue that is to be torn down.
3859  *
3860  * Notes:
3861  *   Before unregistering the queue empty any requests that are blocked
3862  *
3863  *
3864  */
3865 static void
3866 fc_bsg_remove(struct request_queue *q)
3867 {
3868         bsg_remove_queue(q);
3869 }
3870
3871
3872 /* Original Author:  Martin Hicks */
3873 MODULE_AUTHOR("James Smart");
3874 MODULE_DESCRIPTION("FC Transport Attributes");
3875 MODULE_LICENSE("GPL");
3876
3877 module_init(fc_transport_init);
3878 module_exit(fc_transport_exit);