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 <scsi/scsi_device.h>
  34 #include <scsi/scsi_host.h>
  35 #include <scsi/scsi_transport.h>
  36 #include <scsi/scsi_transport_fc.h>
  37 #include <scsi/scsi_cmnd.h>
  38 #include <linux/netlink.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 #include "scsi_transport_fc_internal.h"
  44
  45 static int fc_queue_work(struct Scsi_Host *, struct work_struct *);
  46 static void fc_vport_sched_delete(struct work_struct *work);
  47 static int fc_vport_setup(struct Scsi_Host *shost, int channel,
  48         struct device *pdev, struct fc_vport_identifiers  *ids,
  49         struct fc_vport **vport);
  50 static int fc_bsg_hostadd(struct Scsi_Host *, struct fc_host_attrs *);
  51 static int fc_bsg_rportadd(struct Scsi_Host *, struct fc_rport *);
  52 static void fc_bsg_remove(struct request_queue *);
  53 static void fc_bsg_goose_queue(struct fc_rport *);
  54
  55 /*
  56  * Module Parameters
  57  */
  58
  59 /*
  60  * dev_loss_tmo: the default number of seconds that the FC transport
  61  *   should insulate the loss of a remote port.
  62  *   The maximum will be capped by the value of SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
  63  */
  64 static unsigned int fc_dev_loss_tmo = 60;               /* seconds */
  65
  66 module_param_named(dev_loss_tmo, fc_dev_loss_tmo, uint, S_IRUGO|S_IWUSR);
  67 MODULE_PARM_DESC(dev_loss_tmo,
  68                  "Maximum number of seconds that the FC transport should"
  69                  " insulate the loss of a remote port. Once this value is"
  70                  " exceeded, the scsi target is removed. Value should be"
  71                  " between 1 and SCSI_DEVICE_BLOCK_MAX_TIMEOUT if"
  72                  " fast_io_fail_tmo is not set.");
  73
  74 /*
  75  * Redefine so that we can have same named attributes in the
  76  * sdev/starget/host objects.
  77  */
  78 #define FC_DEVICE_ATTR(_prefix,_name,_mode,_show,_store)                \
  79 struct device_attribute device_attr_##_prefix##_##_name =       \
  80         __ATTR(_name,_mode,_show,_store)
  81
  82 #define fc_enum_name_search(title, table_type, table)                   \
  83 static const char *get_fc_##title##_name(enum table_type table_key)     \
  84 {                                                                       \
  85         int i;                                                          \
  86         char *name = NULL;                                              \
  87                                                                         \
  88         for (i = 0; i < ARRAY_SIZE(table); i++) {                       \
  89                 if (table[i].value == table_key) {                      \
  90                         name = table[i].name;                           \
  91                         break;                                          \
  92                 }                                                       \
  93         }                                                               \
  94         return name;                                                    \
  95 }
  96
  97 #define fc_enum_name_match(title, table_type, table)                    \
  98 static int get_fc_##title##_match(const char *table_key,                \
  99                 enum table_type *value)                                 \
 100 {                                                                       \
 101         int i;                                                          \
 102                                                                         \
 103         for (i = 0; i < ARRAY_SIZE(table); i++) {                       \
 104                 if (strncmp(table_key, table[i].name,                   \
 105                                 table[i].matchlen) == 0) {              \
 106                         *value = table[i].value;                        \
 107                         return 0; /* success */                         \
 108                 }                                                       \
 109         }                                                               \
 110         return 1; /* failure */                                         \
 111 }
 112
 113
 114 /* Convert fc_port_type values to ascii string name */
 115 static struct {
 116         enum fc_port_type       value;
 117         char                    *name;
 118 } fc_port_type_names[] = {
 119         { FC_PORTTYPE_UNKNOWN,          "Unknown" },
 120         { FC_PORTTYPE_OTHER,            "Other" },
 121         { FC_PORTTYPE_NOTPRESENT,       "Not Present" },
 122         { FC_PORTTYPE_NPORT,    "NPort (fabric via point-to-point)" },
 123         { FC_PORTTYPE_NLPORT,   "NLPort (fabric via loop)" },
 124         { FC_PORTTYPE_LPORT,    "LPort (private loop)" },
 125         { FC_PORTTYPE_PTP,      "Point-To-Point (direct nport connection)" },
 126         { FC_PORTTYPE_NPIV,             "NPIV VPORT" },
 127 };
 128 fc_enum_name_search(port_type, fc_port_type, fc_port_type_names)
 129 #define FC_PORTTYPE_MAX_NAMELEN         50
 130
 131 /* Reuse fc_port_type enum function for vport_type */
 132 #define get_fc_vport_type_name get_fc_port_type_name
 133
 134
 135 /* Convert fc_host_event_code values to ascii string name */
 136 static const struct {
 137         enum fc_host_event_code         value;
 138         char                            *name;
 139 } fc_host_event_code_names[] = {
 140         { FCH_EVT_LIP,                  "lip" },
 141         { FCH_EVT_LINKUP,               "link_up" },
 142         { FCH_EVT_LINKDOWN,             "link_down" },
 143         { FCH_EVT_LIPRESET,             "lip_reset" },
 144         { FCH_EVT_RSCN,                 "rscn" },
 145         { FCH_EVT_ADAPTER_CHANGE,       "adapter_chg" },
 146         { FCH_EVT_PORT_UNKNOWN,         "port_unknown" },
 147         { FCH_EVT_PORT_ONLINE,          "port_online" },
 148         { FCH_EVT_PORT_OFFLINE,         "port_offline" },
 149         { FCH_EVT_PORT_FABRIC,          "port_fabric" },
 150         { FCH_EVT_LINK_UNKNOWN,         "link_unknown" },
 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_NOT_NEGOTIATED,  "Not Negotiated" },
 266 };
 267 fc_bitfield_name_search(port_speed, fc_port_speed_names)
 268
 269
 270 static int
 271 show_fc_fc4s (char *buf, u8 *fc4_list)
 272 {
 273         int i, len=0;
 274
 275         for (i = 0; i < FC_FC4_LIST_SIZE; i++, fc4_list++)
 276                 len += sprintf(buf + len , "0x%02x ", *fc4_list);
 277         len += sprintf(buf + len, "\n");
 278         return len;
 279 }
 280
 281
 282 /* Convert FC_PORT_ROLE bit values to ascii string name */
 283 static const struct {
 284         u32                     value;
 285         char                    *name;
 286 } fc_port_role_names[] = {
 287         { FC_PORT_ROLE_FCP_TARGET,      "FCP Target" },
 288         { FC_PORT_ROLE_FCP_INITIATOR,   "FCP Initiator" },
 289         { FC_PORT_ROLE_IP_PORT,         "IP Port" },
 290 };
 291 fc_bitfield_name_search(port_roles, fc_port_role_names)
 292
 293 /*
 294  * Define roles that are specific to port_id. Values are relative to ROLE_MASK.
 295  */
 296 #define FC_WELLKNOWN_PORTID_MASK        0xfffff0
 297 #define FC_WELLKNOWN_ROLE_MASK          0x00000f
 298 #define FC_FPORT_PORTID                 0x00000e
 299 #define FC_FABCTLR_PORTID               0x00000d
 300 #define FC_DIRSRVR_PORTID               0x00000c
 301 #define FC_TIMESRVR_PORTID              0x00000b
 302 #define FC_MGMTSRVR_PORTID              0x00000a
 303
 304
 305 static void fc_timeout_deleted_rport(struct work_struct *work);
 306 static void fc_timeout_fail_rport_io(struct work_struct *work);
 307 static void fc_scsi_scan_rport(struct work_struct *work);
 308
 309 /*
 310  * Attribute counts pre object type...
 311  * Increase these values if you add attributes
 312  */
 313 #define FC_STARGET_NUM_ATTRS    3
 314 #define FC_RPORT_NUM_ATTRS      10
 315 #define FC_VPORT_NUM_ATTRS      9
 316 #define FC_HOST_NUM_ATTRS       29
 317
 318 struct fc_internal {
 319         struct scsi_transport_template t;
 320         struct fc_function_template *f;
 321
 322         /*
 323          * For attributes : each object has :
 324          *   An array of the actual attributes structures
 325          *   An array of null-terminated pointers to the attribute
 326          *     structures - used for mid-layer interaction.
 327          *
 328          * The attribute containers for the starget and host are are
 329          * part of the midlayer. As the remote port is specific to the
 330          * fc transport, we must provide the attribute container.
 331          */
 332         struct device_attribute private_starget_attrs[
 333                                                         FC_STARGET_NUM_ATTRS];
 334         struct device_attribute *starget_attrs[FC_STARGET_NUM_ATTRS + 1];
 335
 336         struct device_attribute private_host_attrs[FC_HOST_NUM_ATTRS];
 337         struct device_attribute *host_attrs[FC_HOST_NUM_ATTRS + 1];
 338
 339         struct transport_container rport_attr_cont;
 340         struct device_attribute private_rport_attrs[FC_RPORT_NUM_ATTRS];
 341         struct device_attribute *rport_attrs[FC_RPORT_NUM_ATTRS + 1];
 342
 343         struct transport_container vport_attr_cont;
 344         struct device_attribute private_vport_attrs[FC_VPORT_NUM_ATTRS];
 345         struct device_attribute *vport_attrs[FC_VPORT_NUM_ATTRS + 1];
 346 };
 347
 348 #define to_fc_internal(tmpl)    container_of(tmpl, struct fc_internal, t)
 349
 350 static int fc_target_setup(struct transport_container *tc, struct device *dev,
 351                            struct device *cdev)
 352 {
 353         struct scsi_target *starget = to_scsi_target(dev);
 354         struct fc_rport *rport = starget_to_rport(starget);
 355
 356         /*
 357          * if parent is remote port, use values from remote port.
 358          * Otherwise, this host uses the fc_transport, but not the
 359          * remote port interface. As such, initialize to known non-values.
 360          */
 361         if (rport) {
 362                 fc_starget_node_name(starget) = rport->node_name;
 363                 fc_starget_port_name(starget) = rport->port_name;
 364                 fc_starget_port_id(starget) = rport->port_id;
 365         } else {
 366                 fc_starget_node_name(starget) = -1;
 367                 fc_starget_port_name(starget) = -1;
 368                 fc_starget_port_id(starget) = -1;
 369         }
 370
 371         return 0;
 372 }
 373
 374 static DECLARE_TRANSPORT_CLASS(fc_transport_class,
 375                                "fc_transport",
 376                                fc_target_setup,
 377                                NULL,
 378                                NULL);
 379
 380 static int fc_host_setup(struct transport_container *tc, struct device *dev,
 381                          struct device *cdev)
 382 {
 383         struct Scsi_Host *shost = dev_to_shost(dev);
 384         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
 385
 386         /*
 387          * Set default values easily detected by the midlayer as
 388          * failure cases.  The scsi lldd is responsible for initializing
 389          * all transport attributes to valid values per host.
 390          */
 391         fc_host->node_name = -1;
 392         fc_host->port_name = -1;
 393         fc_host->permanent_port_name = -1;
 394         fc_host->supported_classes = FC_COS_UNSPECIFIED;
 395         memset(fc_host->supported_fc4s, 0,
 396                 sizeof(fc_host->supported_fc4s));
 397         fc_host->supported_speeds = FC_PORTSPEED_UNKNOWN;
 398         fc_host->maxframe_size = -1;
 399         fc_host->max_npiv_vports = 0;
 400         memset(fc_host->serial_number, 0,
 401                 sizeof(fc_host->serial_number));
 402         memset(fc_host->manufacturer, 0,
 403                 sizeof(fc_host->manufacturer));
 404         memset(fc_host->model, 0,
 405                 sizeof(fc_host->model));
 406         memset(fc_host->model_description, 0,
 407                 sizeof(fc_host->model_description));
 408         memset(fc_host->hardware_version, 0,
 409                 sizeof(fc_host->hardware_version));
 410         memset(fc_host->driver_version, 0,
 411                 sizeof(fc_host->driver_version));
 412         memset(fc_host->firmware_version, 0,
 413                 sizeof(fc_host->firmware_version));
 414         memset(fc_host->optionrom_version, 0,
 415                 sizeof(fc_host->optionrom_version));
 416
 417         fc_host->port_id = -1;
 418         fc_host->port_type = FC_PORTTYPE_UNKNOWN;
 419         fc_host->port_state = FC_PORTSTATE_UNKNOWN;
 420         memset(fc_host->active_fc4s, 0,
 421                 sizeof(fc_host->active_fc4s));
 422         fc_host->speed = FC_PORTSPEED_UNKNOWN;
 423         fc_host->fabric_name = -1;
 424         memset(fc_host->symbolic_name, 0, sizeof(fc_host->symbolic_name));
 425         memset(fc_host->system_hostname, 0, sizeof(fc_host->system_hostname));
 426
 427         fc_host->tgtid_bind_type = FC_TGTID_BIND_BY_WWPN;
 428
 429         INIT_LIST_HEAD(&fc_host->rports);
 430         INIT_LIST_HEAD(&fc_host->rport_bindings);
 431         INIT_LIST_HEAD(&fc_host->vports);
 432         fc_host->next_rport_number = 0;
 433         fc_host->next_target_id = 0;
 434         fc_host->next_vport_number = 0;
 435         fc_host->npiv_vports_inuse = 0;
 436
 437         snprintf(fc_host->work_q_name, sizeof(fc_host->work_q_name),
 438                  "fc_wq_%d", shost->host_no);
 439         fc_host->work_q = alloc_workqueue(fc_host->work_q_name, 0, 0);
 440         if (!fc_host->work_q)
 441                 return -ENOMEM;
 442
 443         fc_host->dev_loss_tmo = fc_dev_loss_tmo;
 444         snprintf(fc_host->devloss_work_q_name,
 445                  sizeof(fc_host->devloss_work_q_name),
 446                  "fc_dl_%d", shost->host_no);
 447         fc_host->devloss_work_q =
 448                         alloc_workqueue(fc_host->devloss_work_q_name, 0, 0);
 449         if (!fc_host->devloss_work_q) {
 450                 destroy_workqueue(fc_host->work_q);
 451                 fc_host->work_q = NULL;
 452                 return -ENOMEM;
 453         }
 454
 455         fc_bsg_hostadd(shost, fc_host);
 456         /* ignore any bsg add error - we just can't do sgio */
 457
 458         return 0;
 459 }
 460
 461 static int fc_host_remove(struct transport_container *tc, struct device *dev,
 462                          struct device *cdev)
 463 {
 464         struct Scsi_Host *shost = dev_to_shost(dev);
 465         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
 466
 467         fc_bsg_remove(fc_host->rqst_q);
 468         return 0;
 469 }
 470
 471 static DECLARE_TRANSPORT_CLASS(fc_host_class,
 472                                "fc_host",
 473                                fc_host_setup,
 474                                fc_host_remove,
 475                                NULL);
 476
 477 /*
 478  * Setup and Remove actions for remote ports are handled
 479  * in the service functions below.
 480  */
 481 static DECLARE_TRANSPORT_CLASS(fc_rport_class,
 482                                "fc_remote_ports",
 483                                NULL,
 484                                NULL,
 485                                NULL);
 486
 487 /*
 488  * Setup and Remove actions for virtual ports are handled
 489  * in the service functions below.
 490  */
 491 static DECLARE_TRANSPORT_CLASS(fc_vport_class,
 492                                "fc_vports",
 493                                NULL,
 494                                NULL,
 495                                NULL);
 496
 497 /*
 498  * Netlink Infrastructure
 499  */
 500
 501 static atomic_t fc_event_seq;
 502
 503 /**
 504  * fc_get_event_number - Obtain the next sequential FC event number
 505  *
 506  * Notes:
 507  *   We could have inlined this, but it would have required fc_event_seq to
 508  *   be exposed. For now, live with the subroutine call.
 509  *   Atomic used to avoid lock/unlock...
 510  */
 511 u32
 512 fc_get_event_number(void)
 513 {
 514         return atomic_add_return(1, &fc_event_seq);
 515 }
 516 EXPORT_SYMBOL(fc_get_event_number);
 517
 518
 519 /**
 520  * fc_host_post_event - called to post an even on an fc_host.
 521  * @shost:              host the event occurred on
 522  * @event_number:       fc event number obtained from get_fc_event_number()
 523  * @event_code:         fc_host event being posted
 524  * @event_data:         32bits of data for the event being posted
 525  *
 526  * Notes:
 527  *      This routine assumes no locks are held on entry.
 528  */
 529 void
 530 fc_host_post_event(struct Scsi_Host *shost, u32 event_number,
 531                 enum fc_host_event_code event_code, u32 event_data)
 532 {
 533         struct sk_buff *skb;
 534         struct nlmsghdr *nlh;
 535         struct fc_nl_event *event;
 536         const char *name;
 537         u32 len, skblen;
 538         int err;
 539
 540         if (!scsi_nl_sock) {
 541                 err = -ENOENT;
 542                 goto send_fail;
 543         }
 544
 545         len = FC_NL_MSGALIGN(sizeof(*event));
 546         skblen = NLMSG_SPACE(len);
 547
 548         skb = alloc_skb(skblen, GFP_KERNEL);
 549         if (!skb) {
 550                 err = -ENOBUFS;
 551                 goto send_fail;
 552         }
 553
 554         nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG,
 555                                 skblen - sizeof(*nlh), 0);
 556         if (!nlh) {
 557                 err = -ENOBUFS;
 558                 goto send_fail_skb;
 559         }
 560         event = NLMSG_DATA(nlh);
 561
 562         INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
 563                                 FC_NL_ASYNC_EVENT, len);
 564         event->seconds = get_seconds();
 565         event->vendor_id = 0;
 566         event->host_no = shost->host_no;
 567         event->event_datalen = sizeof(u32);     /* bytes */
 568         event->event_num = event_number;
 569         event->event_code = event_code;
 570         event->event_data = event_data;
 571
 572         nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
 573                         GFP_KERNEL);
 574         return;
 575
 576 send_fail_skb:
 577         kfree_skb(skb);
 578 send_fail:
 579         name = get_fc_host_event_code_name(event_code);
 580         printk(KERN_WARNING
 581                 "%s: Dropped Event : host %d %s data 0x%08x - err %d\n",
 582                 __func__, shost->host_no,
 583                 (name) ? name : "<unknown>", event_data, err);
 584         return;
 585 }
 586 EXPORT_SYMBOL(fc_host_post_event);
 587
 588
 589 /**
 590  * fc_host_post_vendor_event - called to post a vendor unique event on an fc_host
 591  * @shost:              host the event occurred on
 592  * @event_number:       fc event number obtained from get_fc_event_number()
 593  * @data_len:           amount, in bytes, of vendor unique data
 594  * @data_buf:           pointer to vendor unique data
 595  * @vendor_id:          Vendor id
 596  *
 597  * Notes:
 598  *      This routine assumes no locks are held on entry.
 599  */
 600 void
 601 fc_host_post_vendor_event(struct Scsi_Host *shost, u32 event_number,
 602                 u32 data_len, char * data_buf, u64 vendor_id)
 603 {
 604         struct sk_buff *skb;
 605         struct nlmsghdr *nlh;
 606         struct fc_nl_event *event;
 607         u32 len, skblen;
 608         int err;
 609
 610         if (!scsi_nl_sock) {
 611                 err = -ENOENT;
 612                 goto send_vendor_fail;
 613         }
 614
 615         len = FC_NL_MSGALIGN(sizeof(*event) + data_len);
 616         skblen = NLMSG_SPACE(len);
 617
 618         skb = alloc_skb(skblen, GFP_KERNEL);
 619         if (!skb) {
 620                 err = -ENOBUFS;
 621                 goto send_vendor_fail;
 622         }
 623
 624         nlh = nlmsg_put(skb, 0, 0, SCSI_TRANSPORT_MSG,
 625                                 skblen - sizeof(*nlh), 0);
 626         if (!nlh) {
 627                 err = -ENOBUFS;
 628                 goto send_vendor_fail_skb;
 629         }
 630         event = NLMSG_DATA(nlh);
 631
 632         INIT_SCSI_NL_HDR(&event->snlh, SCSI_NL_TRANSPORT_FC,
 633                                 FC_NL_ASYNC_EVENT, len);
 634         event->seconds = get_seconds();
 635         event->vendor_id = vendor_id;
 636         event->host_no = shost->host_no;
 637         event->event_datalen = data_len;        /* bytes */
 638         event->event_num = event_number;
 639         event->event_code = FCH_EVT_VENDOR_UNIQUE;
 640         memcpy(&event->event_data, data_buf, data_len);
 641
 642         nlmsg_multicast(scsi_nl_sock, skb, 0, SCSI_NL_GRP_FC_EVENTS,
 643                         GFP_KERNEL);
 644         return;
 645
 646 send_vendor_fail_skb:
 647         kfree_skb(skb);
 648 send_vendor_fail:
 649         printk(KERN_WARNING
 650                 "%s: Dropped Event : host %d vendor_unique - err %d\n",
 651                 __func__, shost->host_no, err);
 652         return;
 653 }
 654 EXPORT_SYMBOL(fc_host_post_vendor_event);
 655
 656
 657
 658 static __init int fc_transport_init(void)
 659 {
 660         int error;
 661
 662         atomic_set(&fc_event_seq, 0);
 663
 664         error = transport_class_register(&fc_host_class);
 665         if (error)
 666                 return error;
 667         error = transport_class_register(&fc_vport_class);
 668         if (error)
 669                 goto unreg_host_class;
 670         error = transport_class_register(&fc_rport_class);
 671         if (error)
 672                 goto unreg_vport_class;
 673         error = transport_class_register(&fc_transport_class);
 674         if (error)
 675                 goto unreg_rport_class;
 676         return 0;
 677
 678 unreg_rport_class:
 679         transport_class_unregister(&fc_rport_class);
 680 unreg_vport_class:
 681         transport_class_unregister(&fc_vport_class);
 682 unreg_host_class:
 683         transport_class_unregister(&fc_host_class);
 684         return error;
 685 }
 686
 687 static void __exit fc_transport_exit(void)
 688 {
 689         transport_class_unregister(&fc_transport_class);
 690         transport_class_unregister(&fc_rport_class);
 691         transport_class_unregister(&fc_host_class);
 692         transport_class_unregister(&fc_vport_class);
 693 }
 694
 695 /*
 696  * FC Remote Port Attribute Management
 697  */
 698
 699 #define fc_rport_show_function(field, format_string, sz, cast)          \
 700 static ssize_t                                                          \
 701 show_fc_rport_##field (struct device *dev,                              \
 702                        struct device_attribute *attr, char *buf)        \
 703 {                                                                       \
 704         struct fc_rport *rport = transport_class_to_rport(dev);         \
 705         struct Scsi_Host *shost = rport_to_shost(rport);                \
 706         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 707         if ((i->f->get_rport_##field) &&                                \
 708             !((rport->port_state == FC_PORTSTATE_BLOCKED) ||            \
 709               (rport->port_state == FC_PORTSTATE_DELETED) ||            \
 710               (rport->port_state == FC_PORTSTATE_NOTPRESENT)))          \
 711                 i->f->get_rport_##field(rport);                         \
 712         return snprintf(buf, sz, format_string, cast rport->field);     \
 713 }
 714
 715 #define fc_rport_store_function(field)                                  \
 716 static ssize_t                                                          \
 717 store_fc_rport_##field(struct device *dev,                              \
 718                        struct device_attribute *attr,                   \
 719                        const char *buf, size_t count)                   \
 720 {                                                                       \
 721         int val;                                                        \
 722         struct fc_rport *rport = transport_class_to_rport(dev);         \
 723         struct Scsi_Host *shost = rport_to_shost(rport);                \
 724         struct fc_internal *i = to_fc_internal(shost->transportt);      \
 725         char *cp;                                                       \
 726         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||              \
 727             (rport->port_state == FC_PORTSTATE_DELETED) ||              \
 728             (rport->port_state == FC_PORTSTATE_NOTPRESENT))             \
 729                 return -EBUSY;                                          \
 730         val = simple_strtoul(buf, &cp, 0);                              \
 731         if (*cp && (*cp != '\n'))                                       \
 732                 return -EINVAL;                                         \
 733         i->f->set_rport_##field(rport, val);                            \
 734         return count;                                                   \
 735 }
 736
 737 #define fc_rport_rd_attr(field, format_string, sz)                      \
 738         fc_rport_show_function(field, format_string, sz, )              \
 739 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
 740                          show_fc_rport_##field, NULL)
 741
 742 #define fc_rport_rd_attr_cast(field, format_string, sz, cast)           \
 743         fc_rport_show_function(field, format_string, sz, (cast))        \
 744 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
 745                           show_fc_rport_##field, NULL)
 746
 747 #define fc_rport_rw_attr(field, format_string, sz)                      \
 748         fc_rport_show_function(field, format_string, sz, )              \
 749         fc_rport_store_function(field)                                  \
 750 static FC_DEVICE_ATTR(rport, field, S_IRUGO | S_IWUSR,          \
 751                         show_fc_rport_##field,                          \
 752                         store_fc_rport_##field)
 753
 754
 755 #define fc_private_rport_show_function(field, format_string, sz, cast)  \
 756 static ssize_t                                                          \
 757 show_fc_rport_##field (struct device *dev,                              \
 758                        struct device_attribute *attr, char *buf)        \
 759 {                                                                       \
 760         struct fc_rport *rport = transport_class_to_rport(dev);         \
 761         return snprintf(buf, sz, format_string, cast rport->field);     \
 762 }
 763
 764 #define fc_private_rport_rd_attr(field, format_string, sz)              \
 765         fc_private_rport_show_function(field, format_string, sz, )      \
 766 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
 767                          show_fc_rport_##field, NULL)
 768
 769 #define fc_private_rport_rd_attr_cast(field, format_string, sz, cast)   \
 770         fc_private_rport_show_function(field, format_string, sz, (cast)) \
 771 static FC_DEVICE_ATTR(rport, field, S_IRUGO,                    \
 772                           show_fc_rport_##field, NULL)
 773
 774
 775 #define fc_private_rport_rd_enum_attr(title, maxlen)                    \
 776 static ssize_t                                                          \
 777 show_fc_rport_##title (struct device *dev,                              \
 778                        struct device_attribute *attr, char *buf)        \
 779 {                                                                       \
 780         struct fc_rport *rport = transport_class_to_rport(dev);         \
 781         const char *name;                                               \
 782         name = get_fc_##title##_name(rport->title);                     \
 783         if (!name)                                                      \
 784                 return -EINVAL;                                         \
 785         return snprintf(buf, maxlen, "%s\n", name);                     \
 786 }                                                                       \
 787 static FC_DEVICE_ATTR(rport, title, S_IRUGO,                    \
 788                         show_fc_rport_##title, NULL)
 789
 790
 791 #define SETUP_RPORT_ATTRIBUTE_RD(field)                                 \
 792         i->private_rport_attrs[count] = device_attr_rport_##field; \
 793         i->private_rport_attrs[count].attr.mode = S_IRUGO;              \
 794         i->private_rport_attrs[count].store = NULL;                     \
 795         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 796         if (i->f->show_rport_##field)                                   \
 797                 count++
 798
 799 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(field)                         \
 800         i->private_rport_attrs[count] = device_attr_rport_##field; \
 801         i->private_rport_attrs[count].attr.mode = S_IRUGO;              \
 802         i->private_rport_attrs[count].store = NULL;                     \
 803         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 804         count++
 805
 806 #define SETUP_RPORT_ATTRIBUTE_RW(field)                                 \
 807         i->private_rport_attrs[count] = device_attr_rport_##field; \
 808         if (!i->f->set_rport_##field) {                                 \
 809                 i->private_rport_attrs[count].attr.mode = S_IRUGO;      \
 810                 i->private_rport_attrs[count].store = NULL;             \
 811         }                                                               \
 812         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 813         if (i->f->show_rport_##field)                                   \
 814                 count++
 815
 816 #define SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(field)                         \
 817 {                                                                       \
 818         i->private_rport_attrs[count] = device_attr_rport_##field; \
 819         i->rport_attrs[count] = &i->private_rport_attrs[count];         \
 820         count++;                                                        \
 821 }
 822
 823
 824 /* The FC Transport Remote Port Attributes: */
 825
 826 /* Fixed Remote Port Attributes */
 827
 828 fc_private_rport_rd_attr(maxframe_size, "%u bytes\n", 20);
 829
 830 static ssize_t
 831 show_fc_rport_supported_classes (struct device *dev,
 832                                  struct device_attribute *attr, char *buf)
 833 {
 834         struct fc_rport *rport = transport_class_to_rport(dev);
 835         if (rport->supported_classes == FC_COS_UNSPECIFIED)
 836                 return snprintf(buf, 20, "unspecified\n");
 837         return get_fc_cos_names(rport->supported_classes, buf);
 838 }
 839 static FC_DEVICE_ATTR(rport, supported_classes, S_IRUGO,
 840                 show_fc_rport_supported_classes, NULL);
 841
 842 /* Dynamic Remote Port Attributes */
 843
 844 /*
 845  * dev_loss_tmo attribute
 846  */
 847 static int fc_str_to_dev_loss(const char *buf, unsigned long *val)
 848 {
 849         char *cp;
 850
 851         *val = simple_strtoul(buf, &cp, 0);
 852         if ((*cp && (*cp != '\n')) || (*val < 0))
 853                 return -EINVAL;
 854         /*
 855          * Check for overflow; dev_loss_tmo is u32
 856          */
 857         if (*val > UINT_MAX)
 858                 return -EINVAL;
 859
 860         return 0;
 861 }
 862
 863 static int fc_rport_set_dev_loss_tmo(struct fc_rport *rport,
 864                                      unsigned long val)
 865 {
 866         struct Scsi_Host *shost = rport_to_shost(rport);
 867         struct fc_internal *i = to_fc_internal(shost->transportt);
 868
 869         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
 870             (rport->port_state == FC_PORTSTATE_DELETED) ||
 871             (rport->port_state == FC_PORTSTATE_NOTPRESENT))
 872                 return -EBUSY;
 873         /*
 874          * Check for overflow; dev_loss_tmo is u32
 875          */
 876         if (val > UINT_MAX)
 877                 return -EINVAL;
 878
 879         /*
 880          * If fast_io_fail is off we have to cap
 881          * dev_loss_tmo at SCSI_DEVICE_BLOCK_MAX_TIMEOUT
 882          */
 883         if (rport->fast_io_fail_tmo == -1 &&
 884             val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT)
 885                 return -EINVAL;
 886
 887         i->f->set_rport_dev_loss_tmo(rport, val);
 888         return 0;
 889 }
 890
 891 fc_rport_show_function(dev_loss_tmo, "%d\n", 20, )
 892 static ssize_t
 893 store_fc_rport_dev_loss_tmo(struct device *dev, struct device_attribute *attr,
 894                             const char *buf, size_t count)
 895 {
 896         struct fc_rport *rport = transport_class_to_rport(dev);
 897         unsigned long val;
 898         int rc;
 899
 900         rc = fc_str_to_dev_loss(buf, &val);
 901         if (rc)
 902                 return rc;
 903
 904         rc = fc_rport_set_dev_loss_tmo(rport, val);
 905         if (rc)
 906                 return rc;
 907         return count;
 908 }
 909 static FC_DEVICE_ATTR(rport, dev_loss_tmo, S_IRUGO | S_IWUSR,
 910                 show_fc_rport_dev_loss_tmo, store_fc_rport_dev_loss_tmo);
 911
 912
 913 /* Private Remote Port Attributes */
 914
 915 fc_private_rport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
 916 fc_private_rport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
 917 fc_private_rport_rd_attr(port_id, "0x%06x\n", 20);
 918
 919 static ssize_t
 920 show_fc_rport_roles (struct device *dev, struct device_attribute *attr,
 921                      char *buf)
 922 {
 923         struct fc_rport *rport = transport_class_to_rport(dev);
 924
 925         /* identify any roles that are port_id specific */
 926         if ((rport->port_id != -1) &&
 927             (rport->port_id & FC_WELLKNOWN_PORTID_MASK) ==
 928                                         FC_WELLKNOWN_PORTID_MASK) {
 929                 switch (rport->port_id & FC_WELLKNOWN_ROLE_MASK) {
 930                 case FC_FPORT_PORTID:
 931                         return snprintf(buf, 30, "Fabric Port\n");
 932                 case FC_FABCTLR_PORTID:
 933                         return snprintf(buf, 30, "Fabric Controller\n");
 934                 case FC_DIRSRVR_PORTID:
 935                         return snprintf(buf, 30, "Directory Server\n");
 936                 case FC_TIMESRVR_PORTID:
 937                         return snprintf(buf, 30, "Time Server\n");
 938                 case FC_MGMTSRVR_PORTID:
 939                         return snprintf(buf, 30, "Management Server\n");
 940                 default:
 941                         return snprintf(buf, 30, "Unknown Fabric Entity\n");
 942                 }
 943         } else {
 944                 if (rport->roles == FC_PORT_ROLE_UNKNOWN)
 945                         return snprintf(buf, 20, "unknown\n");
 946                 return get_fc_port_roles_names(rport->roles, buf);
 947         }
 948 }
 949 static FC_DEVICE_ATTR(rport, roles, S_IRUGO,
 950                 show_fc_rport_roles, NULL);
 951
 952 fc_private_rport_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
 953 fc_private_rport_rd_attr(scsi_target_id, "%d\n", 20);
 954
 955 /*
 956  * fast_io_fail_tmo attribute
 957  */
 958 static ssize_t
 959 show_fc_rport_fast_io_fail_tmo (struct device *dev,
 960                                 struct device_attribute *attr, char *buf)
 961 {
 962         struct fc_rport *rport = transport_class_to_rport(dev);
 963
 964         if (rport->fast_io_fail_tmo == -1)
 965                 return snprintf(buf, 5, "off\n");
 966         return snprintf(buf, 20, "%d\n", rport->fast_io_fail_tmo);
 967 }
 968
 969 static ssize_t
 970 store_fc_rport_fast_io_fail_tmo(struct device *dev,
 971                                 struct device_attribute *attr, const char *buf,
 972                                 size_t count)
 973 {
 974         int val;
 975         char *cp;
 976         struct fc_rport *rport = transport_class_to_rport(dev);
 977
 978         if ((rport->port_state == FC_PORTSTATE_BLOCKED) ||
 979             (rport->port_state == FC_PORTSTATE_DELETED) ||
 980             (rport->port_state == FC_PORTSTATE_NOTPRESENT))
 981                 return -EBUSY;
 982         if (strncmp(buf, "off", 3) == 0)
 983                 rport->fast_io_fail_tmo = -1;
 984         else {
 985                 val = simple_strtoul(buf, &cp, 0);
 986                 if ((*cp && (*cp != '\n')) || (val < 0))
 987                         return -EINVAL;
 988                 /*
 989                  * Cap fast_io_fail by dev_loss_tmo or
 990                  * SCSI_DEVICE_BLOCK_MAX_TIMEOUT.
 991                  */
 992                 if ((val >= rport->dev_loss_tmo) ||
 993                     (val > SCSI_DEVICE_BLOCK_MAX_TIMEOUT))
 994                         return -EINVAL;
 995
 996                 rport->fast_io_fail_tmo = val;
 997         }
 998         return count;
 999 }
1000 static FC_DEVICE_ATTR(rport, fast_io_fail_tmo, S_IRUGO | S_IWUSR,
1001         show_fc_rport_fast_io_fail_tmo, store_fc_rport_fast_io_fail_tmo);
1002
1003
1004 /*
1005  * FC SCSI Target Attribute Management
1006  */
1007
1008 /*
1009  * Note: in the target show function we recognize when the remote
1010  *  port is in the hierarchy and do not allow the driver to get
1011  *  involved in sysfs functions. The driver only gets involved if
1012  *  it's the "old" style that doesn't use rports.
1013  */
1014 #define fc_starget_show_function(field, format_string, sz, cast)        \
1015 static ssize_t                                                          \
1016 show_fc_starget_##field (struct device *dev,                            \
1017                          struct device_attribute *attr, char *buf)      \
1018 {                                                                       \
1019         struct scsi_target *starget = transport_class_to_starget(dev);  \
1020         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);    \
1021         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1022         struct fc_rport *rport = starget_to_rport(starget);             \
1023         if (rport)                                                      \
1024                 fc_starget_##field(starget) = rport->field;             \
1025         else if (i->f->get_starget_##field)                             \
1026                 i->f->get_starget_##field(starget);                     \
1027         return snprintf(buf, sz, format_string,                         \
1028                 cast fc_starget_##field(starget));                      \
1029 }
1030
1031 #define fc_starget_rd_attr(field, format_string, sz)                    \
1032         fc_starget_show_function(field, format_string, sz, )            \
1033 static FC_DEVICE_ATTR(starget, field, S_IRUGO,                  \
1034                          show_fc_starget_##field, NULL)
1035
1036 #define fc_starget_rd_attr_cast(field, format_string, sz, cast)         \
1037         fc_starget_show_function(field, format_string, sz, (cast))      \
1038 static FC_DEVICE_ATTR(starget, field, S_IRUGO,                  \
1039                           show_fc_starget_##field, NULL)
1040
1041 #define SETUP_STARGET_ATTRIBUTE_RD(field)                               \
1042         i->private_starget_attrs[count] = device_attr_starget_##field; \
1043         i->private_starget_attrs[count].attr.mode = S_IRUGO;            \
1044         i->private_starget_attrs[count].store = NULL;                   \
1045         i->starget_attrs[count] = &i->private_starget_attrs[count];     \
1046         if (i->f->show_starget_##field)                                 \
1047                 count++
1048
1049 #define SETUP_STARGET_ATTRIBUTE_RW(field)                               \
1050         i->private_starget_attrs[count] = device_attr_starget_##field; \
1051         if (!i->f->set_starget_##field) {                               \
1052                 i->private_starget_attrs[count].attr.mode = S_IRUGO;    \
1053                 i->private_starget_attrs[count].store = NULL;           \
1054         }                                                               \
1055         i->starget_attrs[count] = &i->private_starget_attrs[count];     \
1056         if (i->f->show_starget_##field)                                 \
1057                 count++
1058
1059 /* The FC Transport SCSI Target Attributes: */
1060 fc_starget_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1061 fc_starget_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1062 fc_starget_rd_attr(port_id, "0x%06x\n", 20);
1063
1064
1065 /*
1066  * FC Virtual Port Attribute Management
1067  */
1068
1069 #define fc_vport_show_function(field, format_string, sz, cast)          \
1070 static ssize_t                                                          \
1071 show_fc_vport_##field (struct device *dev,                              \
1072                        struct device_attribute *attr, char *buf)        \
1073 {                                                                       \
1074         struct fc_vport *vport = transport_class_to_vport(dev);         \
1075         struct Scsi_Host *shost = vport_to_shost(vport);                \
1076         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1077         if ((i->f->get_vport_##field) &&                                \
1078             !(vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)))       \
1079                 i->f->get_vport_##field(vport);                         \
1080         return snprintf(buf, sz, format_string, cast vport->field);     \
1081 }
1082
1083 #define fc_vport_store_function(field)                                  \
1084 static ssize_t                                                          \
1085 store_fc_vport_##field(struct device *dev,                              \
1086                        struct device_attribute *attr,                   \
1087                        const char *buf, size_t count)                   \
1088 {                                                                       \
1089         int val;                                                        \
1090         struct fc_vport *vport = transport_class_to_vport(dev);         \
1091         struct Scsi_Host *shost = vport_to_shost(vport);                \
1092         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1093         char *cp;                                                       \
1094         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))  \
1095                 return -EBUSY;                                          \
1096         val = simple_strtoul(buf, &cp, 0);                              \
1097         if (*cp && (*cp != '\n'))                                       \
1098                 return -EINVAL;                                         \
1099         i->f->set_vport_##field(vport, val);                            \
1100         return count;                                                   \
1101 }
1102
1103 #define fc_vport_store_str_function(field, slen)                        \
1104 static ssize_t                                                          \
1105 store_fc_vport_##field(struct device *dev,                              \
1106                        struct device_attribute *attr,                   \
1107                        const char *buf, size_t count)                   \
1108 {                                                                       \
1109         struct fc_vport *vport = transport_class_to_vport(dev);         \
1110         struct Scsi_Host *shost = vport_to_shost(vport);                \
1111         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1112         unsigned int cnt=count;                                         \
1113                                                                         \
1114         /* count may include a LF at end of string */                   \
1115         if (buf[cnt-1] == '\n')                                         \
1116                 cnt--;                                                  \
1117         if (cnt > ((slen) - 1))                                         \
1118                 return -EINVAL;                                         \
1119         memcpy(vport->field, buf, cnt);                                 \
1120         i->f->set_vport_##field(vport);                                 \
1121         return count;                                                   \
1122 }
1123
1124 #define fc_vport_rd_attr(field, format_string, sz)                      \
1125         fc_vport_show_function(field, format_string, sz, )              \
1126 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1127                          show_fc_vport_##field, NULL)
1128
1129 #define fc_vport_rd_attr_cast(field, format_string, sz, cast)           \
1130         fc_vport_show_function(field, format_string, sz, (cast))        \
1131 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1132                           show_fc_vport_##field, NULL)
1133
1134 #define fc_vport_rw_attr(field, format_string, sz)                      \
1135         fc_vport_show_function(field, format_string, sz, )              \
1136         fc_vport_store_function(field)                                  \
1137 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR,          \
1138                         show_fc_vport_##field,                          \
1139                         store_fc_vport_##field)
1140
1141 #define fc_private_vport_show_function(field, format_string, sz, cast)  \
1142 static ssize_t                                                          \
1143 show_fc_vport_##field (struct device *dev,                              \
1144                        struct device_attribute *attr, char *buf)        \
1145 {                                                                       \
1146         struct fc_vport *vport = transport_class_to_vport(dev);         \
1147         return snprintf(buf, sz, format_string, cast vport->field);     \
1148 }
1149
1150 #define fc_private_vport_store_u32_function(field)                      \
1151 static ssize_t                                                          \
1152 store_fc_vport_##field(struct device *dev,                              \
1153                        struct device_attribute *attr,                   \
1154                        const char *buf, size_t count)                   \
1155 {                                                                       \
1156         u32 val;                                                        \
1157         struct fc_vport *vport = transport_class_to_vport(dev);         \
1158         char *cp;                                                       \
1159         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))          \
1160                 return -EBUSY;                                          \
1161         val = simple_strtoul(buf, &cp, 0);                              \
1162         if (*cp && (*cp != '\n'))                                       \
1163                 return -EINVAL;                                         \
1164         vport->field = val;                                             \
1165         return count;                                                   \
1166 }
1167
1168
1169 #define fc_private_vport_rd_attr(field, format_string, sz)              \
1170         fc_private_vport_show_function(field, format_string, sz, )      \
1171 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1172                          show_fc_vport_##field, NULL)
1173
1174 #define fc_private_vport_rd_attr_cast(field, format_string, sz, cast)   \
1175         fc_private_vport_show_function(field, format_string, sz, (cast)) \
1176 static FC_DEVICE_ATTR(vport, field, S_IRUGO,                    \
1177                           show_fc_vport_##field, NULL)
1178
1179 #define fc_private_vport_rw_u32_attr(field, format_string, sz)          \
1180         fc_private_vport_show_function(field, format_string, sz, )      \
1181         fc_private_vport_store_u32_function(field)                      \
1182 static FC_DEVICE_ATTR(vport, field, S_IRUGO | S_IWUSR,          \
1183                         show_fc_vport_##field,                          \
1184                         store_fc_vport_##field)
1185
1186
1187 #define fc_private_vport_rd_enum_attr(title, maxlen)                    \
1188 static ssize_t                                                          \
1189 show_fc_vport_##title (struct device *dev,                              \
1190                        struct device_attribute *attr,                   \
1191                        char *buf)                                       \
1192 {                                                                       \
1193         struct fc_vport *vport = transport_class_to_vport(dev);         \
1194         const char *name;                                               \
1195         name = get_fc_##title##_name(vport->title);                     \
1196         if (!name)                                                      \
1197                 return -EINVAL;                                         \
1198         return snprintf(buf, maxlen, "%s\n", name);                     \
1199 }                                                                       \
1200 static FC_DEVICE_ATTR(vport, title, S_IRUGO,                    \
1201                         show_fc_vport_##title, NULL)
1202
1203
1204 #define SETUP_VPORT_ATTRIBUTE_RD(field)                                 \
1205         i->private_vport_attrs[count] = device_attr_vport_##field; \
1206         i->private_vport_attrs[count].attr.mode = S_IRUGO;              \
1207         i->private_vport_attrs[count].store = NULL;                     \
1208         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1209         if (i->f->get_##field)                                          \
1210                 count++
1211         /* NOTE: Above MACRO differs: checks function not show bit */
1212
1213 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(field)                         \
1214         i->private_vport_attrs[count] = device_attr_vport_##field; \
1215         i->private_vport_attrs[count].attr.mode = S_IRUGO;              \
1216         i->private_vport_attrs[count].store = NULL;                     \
1217         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1218         count++
1219
1220 #define SETUP_VPORT_ATTRIBUTE_WR(field)                                 \
1221         i->private_vport_attrs[count] = device_attr_vport_##field; \
1222         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1223         if (i->f->field)                                                \
1224                 count++
1225         /* NOTE: Above MACRO differs: checks function */
1226
1227 #define SETUP_VPORT_ATTRIBUTE_RW(field)                                 \
1228         i->private_vport_attrs[count] = device_attr_vport_##field; \
1229         if (!i->f->set_vport_##field) {                                 \
1230                 i->private_vport_attrs[count].attr.mode = S_IRUGO;      \
1231                 i->private_vport_attrs[count].store = NULL;             \
1232         }                                                               \
1233         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1234         count++
1235         /* NOTE: Above MACRO differs: does not check show bit */
1236
1237 #define SETUP_PRIVATE_VPORT_ATTRIBUTE_RW(field)                         \
1238 {                                                                       \
1239         i->private_vport_attrs[count] = device_attr_vport_##field; \
1240         i->vport_attrs[count] = &i->private_vport_attrs[count];         \
1241         count++;                                                        \
1242 }
1243
1244
1245 /* The FC Transport Virtual Port Attributes: */
1246
1247 /* Fixed Virtual Port Attributes */
1248
1249 /* Dynamic Virtual Port Attributes */
1250
1251 /* Private Virtual Port Attributes */
1252
1253 fc_private_vport_rd_enum_attr(vport_state, FC_VPORTSTATE_MAX_NAMELEN);
1254 fc_private_vport_rd_enum_attr(vport_last_state, FC_VPORTSTATE_MAX_NAMELEN);
1255 fc_private_vport_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1256 fc_private_vport_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1257
1258 static ssize_t
1259 show_fc_vport_roles (struct device *dev, struct device_attribute *attr,
1260                      char *buf)
1261 {
1262         struct fc_vport *vport = transport_class_to_vport(dev);
1263
1264         if (vport->roles == FC_PORT_ROLE_UNKNOWN)
1265                 return snprintf(buf, 20, "unknown\n");
1266         return get_fc_port_roles_names(vport->roles, buf);
1267 }
1268 static FC_DEVICE_ATTR(vport, roles, S_IRUGO, show_fc_vport_roles, NULL);
1269
1270 fc_private_vport_rd_enum_attr(vport_type, FC_PORTTYPE_MAX_NAMELEN);
1271
1272 fc_private_vport_show_function(symbolic_name, "%s\n",
1273                 FC_VPORT_SYMBOLIC_NAMELEN + 1, )
1274 fc_vport_store_str_function(symbolic_name, FC_VPORT_SYMBOLIC_NAMELEN)
1275 static FC_DEVICE_ATTR(vport, symbolic_name, S_IRUGO | S_IWUSR,
1276                 show_fc_vport_symbolic_name, store_fc_vport_symbolic_name);
1277
1278 static ssize_t
1279 store_fc_vport_delete(struct device *dev, struct device_attribute *attr,
1280                       const char *buf, size_t count)
1281 {
1282         struct fc_vport *vport = transport_class_to_vport(dev);
1283         struct Scsi_Host *shost = vport_to_shost(vport);
1284         unsigned long flags;
1285
1286         spin_lock_irqsave(shost->host_lock, flags);
1287         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING)) {
1288                 spin_unlock_irqrestore(shost->host_lock, flags);
1289                 return -EBUSY;
1290         }
1291         vport->flags |= FC_VPORT_DELETING;
1292         spin_unlock_irqrestore(shost->host_lock, flags);
1293
1294         fc_queue_work(shost, &vport->vport_delete_work);
1295         return count;
1296 }
1297 static FC_DEVICE_ATTR(vport, vport_delete, S_IWUSR,
1298                         NULL, store_fc_vport_delete);
1299
1300
1301 /*
1302  * Enable/Disable vport
1303  *  Write "1" to disable, write "0" to enable
1304  */
1305 static ssize_t
1306 store_fc_vport_disable(struct device *dev, struct device_attribute *attr,
1307                        const char *buf,
1308                            size_t count)
1309 {
1310         struct fc_vport *vport = transport_class_to_vport(dev);
1311         struct Scsi_Host *shost = vport_to_shost(vport);
1312         struct fc_internal *i = to_fc_internal(shost->transportt);
1313         int stat;
1314
1315         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))
1316                 return -EBUSY;
1317
1318         if (*buf == '0') {
1319                 if (vport->vport_state != FC_VPORT_DISABLED)
1320                         return -EALREADY;
1321         } else if (*buf == '1') {
1322                 if (vport->vport_state == FC_VPORT_DISABLED)
1323                         return -EALREADY;
1324         } else
1325                 return -EINVAL;
1326
1327         stat = i->f->vport_disable(vport, ((*buf == '0') ? false : true));
1328         return stat ? stat : count;
1329 }
1330 static FC_DEVICE_ATTR(vport, vport_disable, S_IWUSR,
1331                         NULL, store_fc_vport_disable);
1332
1333
1334 /*
1335  * Host Attribute Management
1336  */
1337
1338 #define fc_host_show_function(field, format_string, sz, cast)           \
1339 static ssize_t                                                          \
1340 show_fc_host_##field (struct device *dev,                               \
1341                       struct device_attribute *attr, char *buf)         \
1342 {                                                                       \
1343         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1344         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1345         if (i->f->get_host_##field)                                     \
1346                 i->f->get_host_##field(shost);                          \
1347         return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1348 }
1349
1350 #define fc_host_store_function(field)                                   \
1351 static ssize_t                                                          \
1352 store_fc_host_##field(struct device *dev,                               \
1353                       struct device_attribute *attr,                    \
1354                       const char *buf,  size_t count)                   \
1355 {                                                                       \
1356         int val;                                                        \
1357         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1358         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1359         char *cp;                                                       \
1360                                                                         \
1361         val = simple_strtoul(buf, &cp, 0);                              \
1362         if (*cp && (*cp != '\n'))                                       \
1363                 return -EINVAL;                                         \
1364         i->f->set_host_##field(shost, val);                             \
1365         return count;                                                   \
1366 }
1367
1368 #define fc_host_store_str_function(field, slen)                         \
1369 static ssize_t                                                          \
1370 store_fc_host_##field(struct device *dev,                               \
1371                       struct device_attribute *attr,                    \
1372                       const char *buf, size_t count)                    \
1373 {                                                                       \
1374         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1375         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1376         unsigned int cnt=count;                                         \
1377                                                                         \
1378         /* count may include a LF at end of string */                   \
1379         if (buf[cnt-1] == '\n')                                         \
1380                 cnt--;                                                  \
1381         if (cnt > ((slen) - 1))                                         \
1382                 return -EINVAL;                                         \
1383         memcpy(fc_host_##field(shost), buf, cnt);                       \
1384         i->f->set_host_##field(shost);                                  \
1385         return count;                                                   \
1386 }
1387
1388 #define fc_host_rd_attr(field, format_string, sz)                       \
1389         fc_host_show_function(field, format_string, sz, )               \
1390 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1391                          show_fc_host_##field, NULL)
1392
1393 #define fc_host_rd_attr_cast(field, format_string, sz, cast)            \
1394         fc_host_show_function(field, format_string, sz, (cast))         \
1395 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1396                           show_fc_host_##field, NULL)
1397
1398 #define fc_host_rw_attr(field, format_string, sz)                       \
1399         fc_host_show_function(field, format_string, sz, )               \
1400         fc_host_store_function(field)                                   \
1401 static FC_DEVICE_ATTR(host, field, S_IRUGO | S_IWUSR,           \
1402                         show_fc_host_##field,                           \
1403                         store_fc_host_##field)
1404
1405 #define fc_host_rd_enum_attr(title, maxlen)                             \
1406 static ssize_t                                                          \
1407 show_fc_host_##title (struct device *dev,                               \
1408                       struct device_attribute *attr, char *buf)         \
1409 {                                                                       \
1410         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1411         struct fc_internal *i = to_fc_internal(shost->transportt);      \
1412         const char *name;                                               \
1413         if (i->f->get_host_##title)                                     \
1414                 i->f->get_host_##title(shost);                          \
1415         name = get_fc_##title##_name(fc_host_##title(shost));           \
1416         if (!name)                                                      \
1417                 return -EINVAL;                                         \
1418         return snprintf(buf, maxlen, "%s\n", name);                     \
1419 }                                                                       \
1420 static FC_DEVICE_ATTR(host, title, S_IRUGO, show_fc_host_##title, NULL)
1421
1422 #define SETUP_HOST_ATTRIBUTE_RD(field)                                  \
1423         i->private_host_attrs[count] = device_attr_host_##field;        \
1424         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
1425         i->private_host_attrs[count].store = NULL;                      \
1426         i->host_attrs[count] = &i->private_host_attrs[count];           \
1427         if (i->f->show_host_##field)                                    \
1428                 count++
1429
1430 #define SETUP_HOST_ATTRIBUTE_RD_NS(field)                               \
1431         i->private_host_attrs[count] = device_attr_host_##field;        \
1432         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
1433         i->private_host_attrs[count].store = NULL;                      \
1434         i->host_attrs[count] = &i->private_host_attrs[count];           \
1435         count++
1436
1437 #define SETUP_HOST_ATTRIBUTE_RW(field)                                  \
1438         i->private_host_attrs[count] = device_attr_host_##field;        \
1439         if (!i->f->set_host_##field) {                                  \
1440                 i->private_host_attrs[count].attr.mode = S_IRUGO;       \
1441                 i->private_host_attrs[count].store = NULL;              \
1442         }                                                               \
1443         i->host_attrs[count] = &i->private_host_attrs[count];           \
1444         if (i->f->show_host_##field)                                    \
1445                 count++
1446
1447
1448 #define fc_private_host_show_function(field, format_string, sz, cast)   \
1449 static ssize_t                                                          \
1450 show_fc_host_##field (struct device *dev,                               \
1451                       struct device_attribute *attr, char *buf)         \
1452 {                                                                       \
1453         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1454         return snprintf(buf, sz, format_string, cast fc_host_##field(shost)); \
1455 }
1456
1457 #define fc_private_host_rd_attr(field, format_string, sz)               \
1458         fc_private_host_show_function(field, format_string, sz, )       \
1459 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1460                          show_fc_host_##field, NULL)
1461
1462 #define fc_private_host_rd_attr_cast(field, format_string, sz, cast)    \
1463         fc_private_host_show_function(field, format_string, sz, (cast)) \
1464 static FC_DEVICE_ATTR(host, field, S_IRUGO,                     \
1465                           show_fc_host_##field, NULL)
1466
1467 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RD(field)                  \
1468         i->private_host_attrs[count] = device_attr_host_##field;        \
1469         i->private_host_attrs[count].attr.mode = S_IRUGO;               \
1470         i->private_host_attrs[count].store = NULL;                      \
1471         i->host_attrs[count] = &i->private_host_attrs[count];           \
1472         count++
1473
1474 #define SETUP_PRIVATE_HOST_ATTRIBUTE_RW(field)                  \
1475 {                                                                       \
1476         i->private_host_attrs[count] = device_attr_host_##field;        \
1477         i->host_attrs[count] = &i->private_host_attrs[count];           \
1478         count++;                                                        \
1479 }
1480
1481
1482 /* Fixed Host Attributes */
1483
1484 static ssize_t
1485 show_fc_host_supported_classes (struct device *dev,
1486                                 struct device_attribute *attr, char *buf)
1487 {
1488         struct Scsi_Host *shost = transport_class_to_shost(dev);
1489
1490         if (fc_host_supported_classes(shost) == FC_COS_UNSPECIFIED)
1491                 return snprintf(buf, 20, "unspecified\n");
1492
1493         return get_fc_cos_names(fc_host_supported_classes(shost), buf);
1494 }
1495 static FC_DEVICE_ATTR(host, supported_classes, S_IRUGO,
1496                 show_fc_host_supported_classes, NULL);
1497
1498 static ssize_t
1499 show_fc_host_supported_fc4s (struct device *dev,
1500                              struct device_attribute *attr, char *buf)
1501 {
1502         struct Scsi_Host *shost = transport_class_to_shost(dev);
1503         return (ssize_t)show_fc_fc4s(buf, fc_host_supported_fc4s(shost));
1504 }
1505 static FC_DEVICE_ATTR(host, supported_fc4s, S_IRUGO,
1506                 show_fc_host_supported_fc4s, NULL);
1507
1508 static ssize_t
1509 show_fc_host_supported_speeds (struct device *dev,
1510                                struct device_attribute *attr, char *buf)
1511 {
1512         struct Scsi_Host *shost = transport_class_to_shost(dev);
1513
1514         if (fc_host_supported_speeds(shost) == FC_PORTSPEED_UNKNOWN)
1515                 return snprintf(buf, 20, "unknown\n");
1516
1517         return get_fc_port_speed_names(fc_host_supported_speeds(shost), buf);
1518 }
1519 static FC_DEVICE_ATTR(host, supported_speeds, S_IRUGO,
1520                 show_fc_host_supported_speeds, NULL);
1521
1522
1523 fc_private_host_rd_attr_cast(node_name, "0x%llx\n", 20, unsigned long long);
1524 fc_private_host_rd_attr_cast(port_name, "0x%llx\n", 20, unsigned long long);
1525 fc_private_host_rd_attr_cast(permanent_port_name, "0x%llx\n", 20,
1526                              unsigned long long);
1527 fc_private_host_rd_attr(maxframe_size, "%u bytes\n", 20);
1528 fc_private_host_rd_attr(max_npiv_vports, "%u\n", 20);
1529 fc_private_host_rd_attr(serial_number, "%s\n", (FC_SERIAL_NUMBER_SIZE +1));
1530 fc_private_host_rd_attr(manufacturer, "%s\n", FC_SERIAL_NUMBER_SIZE + 1);
1531 fc_private_host_rd_attr(model, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1532 fc_private_host_rd_attr(model_description, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1533 fc_private_host_rd_attr(hardware_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1534 fc_private_host_rd_attr(driver_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1535 fc_private_host_rd_attr(firmware_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1536 fc_private_host_rd_attr(optionrom_version, "%s\n", FC_VERSION_STRING_SIZE + 1);
1537
1538
1539 /* Dynamic Host Attributes */
1540
1541 static ssize_t
1542 show_fc_host_active_fc4s (struct device *dev,
1543                           struct device_attribute *attr, char *buf)
1544 {
1545         struct Scsi_Host *shost = transport_class_to_shost(dev);
1546         struct fc_internal *i = to_fc_internal(shost->transportt);
1547
1548         if (i->f->get_host_active_fc4s)
1549                 i->f->get_host_active_fc4s(shost);
1550
1551         return (ssize_t)show_fc_fc4s(buf, fc_host_active_fc4s(shost));
1552 }
1553 static FC_DEVICE_ATTR(host, active_fc4s, S_IRUGO,
1554                 show_fc_host_active_fc4s, NULL);
1555
1556 static ssize_t
1557 show_fc_host_speed (struct device *dev,
1558                     struct device_attribute *attr, char *buf)
1559 {
1560         struct Scsi_Host *shost = transport_class_to_shost(dev);
1561         struct fc_internal *i = to_fc_internal(shost->transportt);
1562
1563         if (i->f->get_host_speed)
1564                 i->f->get_host_speed(shost);
1565
1566         if (fc_host_speed(shost) == FC_PORTSPEED_UNKNOWN)
1567                 return snprintf(buf, 20, "unknown\n");
1568
1569         return get_fc_port_speed_names(fc_host_speed(shost), buf);
1570 }
1571 static FC_DEVICE_ATTR(host, speed, S_IRUGO,
1572                 show_fc_host_speed, NULL);
1573
1574
1575 fc_host_rd_attr(port_id, "0x%06x\n", 20);
1576 fc_host_rd_enum_attr(port_type, FC_PORTTYPE_MAX_NAMELEN);
1577 fc_host_rd_enum_attr(port_state, FC_PORTSTATE_MAX_NAMELEN);
1578 fc_host_rd_attr_cast(fabric_name, "0x%llx\n", 20, unsigned long long);
1579 fc_host_rd_attr(symbolic_name, "%s\n", FC_SYMBOLIC_NAME_SIZE + 1);
1580
1581 fc_private_host_show_function(system_hostname, "%s\n",
1582                 FC_SYMBOLIC_NAME_SIZE + 1, )
1583 fc_host_store_str_function(system_hostname, FC_SYMBOLIC_NAME_SIZE)
1584 static FC_DEVICE_ATTR(host, system_hostname, S_IRUGO | S_IWUSR,
1585                 show_fc_host_system_hostname, store_fc_host_system_hostname);
1586
1587
1588 /* Private Host Attributes */
1589
1590 static ssize_t
1591 show_fc_private_host_tgtid_bind_type(struct device *dev,
1592                                      struct device_attribute *attr, char *buf)
1593 {
1594         struct Scsi_Host *shost = transport_class_to_shost(dev);
1595         const char *name;
1596
1597         name = get_fc_tgtid_bind_type_name(fc_host_tgtid_bind_type(shost));
1598         if (!name)
1599                 return -EINVAL;
1600         return snprintf(buf, FC_BINDTYPE_MAX_NAMELEN, "%s\n", name);
1601 }
1602
1603 #define get_list_head_entry(pos, head, member)          \
1604         pos = list_entry((head)->next, typeof(*pos), member)
1605
1606 static ssize_t
1607 store_fc_private_host_tgtid_bind_type(struct device *dev,
1608         struct device_attribute *attr, const char *buf, size_t count)
1609 {
1610         struct Scsi_Host *shost = transport_class_to_shost(dev);
1611         struct fc_rport *rport;
1612         enum fc_tgtid_binding_type val;
1613         unsigned long flags;
1614
1615         if (get_fc_tgtid_bind_type_match(buf, &val))
1616                 return -EINVAL;
1617
1618         /* if changing bind type, purge all unused consistent bindings */
1619         if (val != fc_host_tgtid_bind_type(shost)) {
1620                 spin_lock_irqsave(shost->host_lock, flags);
1621                 while (!list_empty(&fc_host_rport_bindings(shost))) {
1622                         get_list_head_entry(rport,
1623                                 &fc_host_rport_bindings(shost), peers);
1624                         list_del(&rport->peers);
1625                         rport->port_state = FC_PORTSTATE_DELETED;
1626                         fc_queue_work(shost, &rport->rport_delete_work);
1627                 }
1628                 spin_unlock_irqrestore(shost->host_lock, flags);
1629         }
1630
1631         fc_host_tgtid_bind_type(shost) = val;
1632         return count;
1633 }
1634
1635 static FC_DEVICE_ATTR(host, tgtid_bind_type, S_IRUGO | S_IWUSR,
1636                         show_fc_private_host_tgtid_bind_type,
1637                         store_fc_private_host_tgtid_bind_type);
1638
1639 static ssize_t
1640 store_fc_private_host_issue_lip(struct device *dev,
1641         struct device_attribute *attr, const char *buf, size_t count)
1642 {
1643         struct Scsi_Host *shost = transport_class_to_shost(dev);
1644         struct fc_internal *i = to_fc_internal(shost->transportt);
1645         int ret;
1646
1647         /* ignore any data value written to the attribute */
1648         if (i->f->issue_fc_host_lip) {
1649                 ret = i->f->issue_fc_host_lip(shost);
1650                 return ret ? ret: count;
1651         }
1652
1653         return -ENOENT;
1654 }
1655
1656 static FC_DEVICE_ATTR(host, issue_lip, S_IWUSR, NULL,
1657                         store_fc_private_host_issue_lip);
1658
1659 static ssize_t
1660 store_fc_private_host_dev_loss_tmo(struct device *dev,
1661                                    struct device_attribute *attr,
1662                                    const char *buf, size_t count)
1663 {
1664         struct Scsi_Host *shost = transport_class_to_shost(dev);
1665         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
1666         struct fc_rport *rport;
1667         unsigned long val, flags;
1668         int rc;
1669
1670         rc = fc_str_to_dev_loss(buf, &val);
1671         if (rc)
1672                 return rc;
1673
1674         fc_host_dev_loss_tmo(shost) = val;
1675         spin_lock_irqsave(shost->host_lock, flags);
1676         list_for_each_entry(rport, &fc_host->rports, peers)
1677                 fc_rport_set_dev_loss_tmo(rport, val);
1678         spin_unlock_irqrestore(shost->host_lock, flags);
1679         return count;
1680 }
1681
1682 fc_private_host_show_function(dev_loss_tmo, "%d\n", 20, );
1683 static FC_DEVICE_ATTR(host, dev_loss_tmo, S_IRUGO | S_IWUSR,
1684                       show_fc_host_dev_loss_tmo,
1685                       store_fc_private_host_dev_loss_tmo);
1686
1687 fc_private_host_rd_attr(npiv_vports_inuse, "%u\n", 20);
1688
1689 /*
1690  * Host Statistics Management
1691  */
1692
1693 /* Show a given an attribute in the statistics group */
1694 static ssize_t
1695 fc_stat_show(const struct device *dev, char *buf, unsigned long offset)
1696 {
1697         struct Scsi_Host *shost = transport_class_to_shost(dev);
1698         struct fc_internal *i = to_fc_internal(shost->transportt);
1699         struct fc_host_statistics *stats;
1700         ssize_t ret = -ENOENT;
1701
1702         if (offset > sizeof(struct fc_host_statistics) ||
1703             offset % sizeof(u64) != 0)
1704                 WARN_ON(1);
1705
1706         if (i->f->get_fc_host_stats) {
1707                 stats = (i->f->get_fc_host_stats)(shost);
1708                 if (stats)
1709                         ret = snprintf(buf, 20, "0x%llx\n",
1710                               (unsigned long long)*(u64 *)(((u8 *) stats) + offset));
1711         }
1712         return ret;
1713 }
1714
1715
1716 /* generate a read-only statistics attribute */
1717 #define fc_host_statistic(name)                                         \
1718 static ssize_t show_fcstat_##name(struct device *cd,                    \
1719                                   struct device_attribute *attr,        \
1720                                   char *buf)                            \
1721 {                                                                       \
1722         return fc_stat_show(cd, buf,                                    \
1723                             offsetof(struct fc_host_statistics, name)); \
1724 }                                                                       \
1725 static FC_DEVICE_ATTR(host, name, S_IRUGO, show_fcstat_##name, NULL)
1726
1727 fc_host_statistic(seconds_since_last_reset);
1728 fc_host_statistic(tx_frames);
1729 fc_host_statistic(tx_words);
1730 fc_host_statistic(rx_frames);
1731 fc_host_statistic(rx_words);
1732 fc_host_statistic(lip_count);
1733 fc_host_statistic(nos_count);
1734 fc_host_statistic(error_frames);
1735 fc_host_statistic(dumped_frames);
1736 fc_host_statistic(link_failure_count);
1737 fc_host_statistic(loss_of_sync_count);
1738 fc_host_statistic(loss_of_signal_count);
1739 fc_host_statistic(prim_seq_protocol_err_count);
1740 fc_host_statistic(invalid_tx_word_count);
1741 fc_host_statistic(invalid_crc_count);
1742 fc_host_statistic(fcp_input_requests);
1743 fc_host_statistic(fcp_output_requests);
1744 fc_host_statistic(fcp_control_requests);
1745 fc_host_statistic(fcp_input_megabytes);
1746 fc_host_statistic(fcp_output_megabytes);
1747
1748 static ssize_t
1749 fc_reset_statistics(struct device *dev, struct device_attribute *attr,
1750                     const char *buf, size_t count)
1751 {
1752         struct Scsi_Host *shost = transport_class_to_shost(dev);
1753         struct fc_internal *i = to_fc_internal(shost->transportt);
1754
1755         /* ignore any data value written to the attribute */
1756         if (i->f->reset_fc_host_stats) {
1757                 i->f->reset_fc_host_stats(shost);
1758                 return count;
1759         }
1760
1761         return -ENOENT;
1762 }
1763 static FC_DEVICE_ATTR(host, reset_statistics, S_IWUSR, NULL,
1764                                 fc_reset_statistics);
1765
1766 static struct attribute *fc_statistics_attrs[] = {
1767         &device_attr_host_seconds_since_last_reset.attr,
1768         &device_attr_host_tx_frames.attr,
1769         &device_attr_host_tx_words.attr,
1770         &device_attr_host_rx_frames.attr,
1771         &device_attr_host_rx_words.attr,
1772         &device_attr_host_lip_count.attr,
1773         &device_attr_host_nos_count.attr,
1774         &device_attr_host_error_frames.attr,
1775         &device_attr_host_dumped_frames.attr,
1776         &device_attr_host_link_failure_count.attr,
1777         &device_attr_host_loss_of_sync_count.attr,
1778         &device_attr_host_loss_of_signal_count.attr,
1779         &device_attr_host_prim_seq_protocol_err_count.attr,
1780         &device_attr_host_invalid_tx_word_count.attr,
1781         &device_attr_host_invalid_crc_count.attr,
1782         &device_attr_host_fcp_input_requests.attr,
1783         &device_attr_host_fcp_output_requests.attr,
1784         &device_attr_host_fcp_control_requests.attr,
1785         &device_attr_host_fcp_input_megabytes.attr,
1786         &device_attr_host_fcp_output_megabytes.attr,
1787         &device_attr_host_reset_statistics.attr,
1788         NULL
1789 };
1790
1791 static struct attribute_group fc_statistics_group = {
1792         .name = "statistics",
1793         .attrs = fc_statistics_attrs,
1794 };
1795
1796
1797 /* Host Vport Attributes */
1798
1799 static int
1800 fc_parse_wwn(const char *ns, u64 *nm)
1801 {
1802         unsigned int i, j;
1803         u8 wwn[8];
1804
1805         memset(wwn, 0, sizeof(wwn));
1806
1807         /* Validate and store the new name */
1808         for (i=0, j=0; i < 16; i++) {
1809                 int value;
1810
1811                 value = hex_to_bin(*ns++);
1812                 if (value >= 0)
1813                         j = (j << 4) | value;
1814                 else
1815                         return -EINVAL;
1816                 if (i % 2) {
1817                         wwn[i/2] = j & 0xff;
1818                         j = 0;
1819                 }
1820         }
1821
1822         *nm = wwn_to_u64(wwn);
1823
1824         return 0;
1825 }
1826
1827
1828 /*
1829  * "Short-cut" sysfs variable to create a new vport on a FC Host.
1830  * Input is a string of the form "<WWPN>:<WWNN>". Other attributes
1831  * will default to a NPIV-based FCP_Initiator; The WWNs are specified
1832  * as hex characters, and may *not* contain any prefixes (e.g. 0x, x, etc)
1833  */
1834 static ssize_t
1835 store_fc_host_vport_create(struct device *dev, struct device_attribute *attr,
1836                            const char *buf, size_t count)
1837 {
1838         struct Scsi_Host *shost = transport_class_to_shost(dev);
1839         struct fc_vport_identifiers vid;
1840         struct fc_vport *vport;
1841         unsigned int cnt=count;
1842         int stat;
1843
1844         memset(&vid, 0, sizeof(vid));
1845
1846         /* count may include a LF at end of string */
1847         if (buf[cnt-1] == '\n')
1848                 cnt--;
1849
1850         /* validate we have enough characters for WWPN */
1851         if ((cnt != (16+1+16)) || (buf[16] != ':'))
1852                 return -EINVAL;
1853
1854         stat = fc_parse_wwn(&buf[0], &vid.port_name);
1855         if (stat)
1856                 return stat;
1857
1858         stat = fc_parse_wwn(&buf[17], &vid.node_name);
1859         if (stat)
1860                 return stat;
1861
1862         vid.roles = FC_PORT_ROLE_FCP_INITIATOR;
1863         vid.vport_type = FC_PORTTYPE_NPIV;
1864         /* vid.symbolic_name is already zero/NULL's */
1865         vid.disable = false;            /* always enabled */
1866
1867         /* we only allow support on Channel 0 !!! */
1868         stat = fc_vport_setup(shost, 0, &shost->shost_gendev, &vid, &vport);
1869         return stat ? stat : count;
1870 }
1871 static FC_DEVICE_ATTR(host, vport_create, S_IWUSR, NULL,
1872                         store_fc_host_vport_create);
1873
1874
1875 /*
1876  * "Short-cut" sysfs variable to delete a vport on a FC Host.
1877  * Vport is identified by a string containing "<WWPN>:<WWNN>".
1878  * The WWNs are specified as hex characters, and may *not* contain
1879  * any prefixes (e.g. 0x, x, etc)
1880  */
1881 static ssize_t
1882 store_fc_host_vport_delete(struct device *dev, struct device_attribute *attr,
1883                            const char *buf, size_t count)
1884 {
1885         struct Scsi_Host *shost = transport_class_to_shost(dev);
1886         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
1887         struct fc_vport *vport;
1888         u64 wwpn, wwnn;
1889         unsigned long flags;
1890         unsigned int cnt=count;
1891         int stat, match;
1892
1893         /* count may include a LF at end of string */
1894         if (buf[cnt-1] == '\n')
1895                 cnt--;
1896
1897         /* validate we have enough characters for WWPN */
1898         if ((cnt != (16+1+16)) || (buf[16] != ':'))
1899                 return -EINVAL;
1900
1901         stat = fc_parse_wwn(&buf[0], &wwpn);
1902         if (stat)
1903                 return stat;
1904
1905         stat = fc_parse_wwn(&buf[17], &wwnn);
1906         if (stat)
1907                 return stat;
1908
1909         spin_lock_irqsave(shost->host_lock, flags);
1910         match = 0;
1911         /* we only allow support on Channel 0 !!! */
1912         list_for_each_entry(vport, &fc_host->vports, peers) {
1913                 if ((vport->channel == 0) &&
1914                     (vport->port_name == wwpn) && (vport->node_name == wwnn)) {
1915                         if (vport->flags & (FC_VPORT_DEL | FC_VPORT_CREATING))
1916                                 break;
1917                         vport->flags |= FC_VPORT_DELETING;
1918                         match = 1;
1919                         break;
1920                 }
1921         }
1922         spin_unlock_irqrestore(shost->host_lock, flags);
1923
1924         if (!match)
1925                 return -ENODEV;
1926
1927         stat = fc_vport_terminate(vport);
1928         return stat ? stat : count;
1929 }
1930 static FC_DEVICE_ATTR(host, vport_delete, S_IWUSR, NULL,
1931                         store_fc_host_vport_delete);
1932
1933
1934 static int fc_host_match(struct attribute_container *cont,
1935                           struct device *dev)
1936 {
1937         struct Scsi_Host *shost;
1938         struct fc_internal *i;
1939
1940         if (!scsi_is_host_device(dev))
1941                 return 0;
1942
1943         shost = dev_to_shost(dev);
1944         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1945             != &fc_host_class.class)
1946                 return 0;
1947
1948         i = to_fc_internal(shost->transportt);
1949
1950         return &i->t.host_attrs.ac == cont;
1951 }
1952
1953 static int fc_target_match(struct attribute_container *cont,
1954                             struct device *dev)
1955 {
1956         struct Scsi_Host *shost;
1957         struct fc_internal *i;
1958
1959         if (!scsi_is_target_device(dev))
1960                 return 0;
1961
1962         shost = dev_to_shost(dev->parent);
1963         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1964             != &fc_host_class.class)
1965                 return 0;
1966
1967         i = to_fc_internal(shost->transportt);
1968
1969         return &i->t.target_attrs.ac == cont;
1970 }
1971
1972 static void fc_rport_dev_release(struct device *dev)
1973 {
1974         struct fc_rport *rport = dev_to_rport(dev);
1975         put_device(dev->parent);
1976         kfree(rport);
1977 }
1978
1979 int scsi_is_fc_rport(const struct device *dev)
1980 {
1981         return dev->release == fc_rport_dev_release;
1982 }
1983 EXPORT_SYMBOL(scsi_is_fc_rport);
1984
1985 static int fc_rport_match(struct attribute_container *cont,
1986                             struct device *dev)
1987 {
1988         struct Scsi_Host *shost;
1989         struct fc_internal *i;
1990
1991         if (!scsi_is_fc_rport(dev))
1992                 return 0;
1993
1994         shost = dev_to_shost(dev->parent);
1995         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
1996             != &fc_host_class.class)
1997                 return 0;
1998
1999         i = to_fc_internal(shost->transportt);
2000
2001         return &i->rport_attr_cont.ac == cont;
2002 }
2003
2004
2005 static void fc_vport_dev_release(struct device *dev)
2006 {
2007         struct fc_vport *vport = dev_to_vport(dev);
2008         put_device(dev->parent);                /* release kobj parent */
2009         kfree(vport);
2010 }
2011
2012 int scsi_is_fc_vport(const struct device *dev)
2013 {
2014         return dev->release == fc_vport_dev_release;
2015 }
2016 EXPORT_SYMBOL(scsi_is_fc_vport);
2017
2018 static int fc_vport_match(struct attribute_container *cont,
2019                             struct device *dev)
2020 {
2021         struct fc_vport *vport;
2022         struct Scsi_Host *shost;
2023         struct fc_internal *i;
2024
2025         if (!scsi_is_fc_vport(dev))
2026                 return 0;
2027         vport = dev_to_vport(dev);
2028
2029         shost = vport_to_shost(vport);
2030         if (!shost->transportt  || shost->transportt->host_attrs.ac.class
2031             != &fc_host_class.class)
2032                 return 0;
2033
2034         i = to_fc_internal(shost->transportt);
2035         return &i->vport_attr_cont.ac == cont;
2036 }
2037
2038
2039 /**
2040  * fc_timed_out - FC Transport I/O timeout intercept handler
2041  * @scmd:       The SCSI command which timed out
2042  *
2043  * This routine protects against error handlers getting invoked while a
2044  * rport is in a blocked state, typically due to a temporarily loss of
2045  * connectivity. If the error handlers are allowed to proceed, requests
2046  * to abort i/o, reset the target, etc will likely fail as there is no way
2047  * to communicate with the device to perform the requested function. These
2048  * failures may result in the midlayer taking the device offline, requiring
2049  * manual intervention to restore operation.
2050  *
2051  * This routine, called whenever an i/o times out, validates the state of
2052  * the underlying rport. If the rport is blocked, it returns
2053  * EH_RESET_TIMER, which will continue to reschedule the timeout.
2054  * Eventually, either the device will return, or devloss_tmo will fire,
2055  * and when the timeout then fires, it will be handled normally.
2056  * If the rport is not blocked, normal error handling continues.
2057  *
2058  * Notes:
2059  *      This routine assumes no locks are held on entry.
2060  */
2061 static enum blk_eh_timer_return
2062 fc_timed_out(struct scsi_cmnd *scmd)
2063 {
2064         struct fc_rport *rport = starget_to_rport(scsi_target(scmd->device));
2065
2066         if (rport->port_state == FC_PORTSTATE_BLOCKED)
2067                 return BLK_EH_RESET_TIMER;
2068
2069         return BLK_EH_NOT_HANDLED;
2070 }
2071
2072 /*
2073  * Called by fc_user_scan to locate an rport on the shost that
2074  * matches the channel and target id, and invoke scsi_scan_target()
2075  * on the rport.
2076  */
2077 static void
2078 fc_user_scan_tgt(struct Scsi_Host *shost, uint channel, uint id, uint lun)
2079 {
2080         struct fc_rport *rport;
2081         unsigned long flags;
2082
2083         spin_lock_irqsave(shost->host_lock, flags);
2084
2085         list_for_each_entry(rport, &fc_host_rports(shost), peers) {
2086                 if (rport->scsi_target_id == -1)
2087                         continue;
2088
2089                 if (rport->port_state != FC_PORTSTATE_ONLINE)
2090                         continue;
2091
2092                 if ((channel == rport->channel) &&
2093                     (id == rport->scsi_target_id)) {
2094                         spin_unlock_irqrestore(shost->host_lock, flags);
2095                         scsi_scan_target(&rport->dev, channel, id, lun, 1);
2096                         return;
2097                 }
2098         }
2099
2100         spin_unlock_irqrestore(shost->host_lock, flags);
2101 }
2102
2103 /*
2104  * Called via sysfs scan routines. Necessary, as the FC transport
2105  * wants to place all target objects below the rport object. So this
2106  * routine must invoke the scsi_scan_target() routine with the rport
2107  * object as the parent.
2108  */
2109 static int
2110 fc_user_scan(struct Scsi_Host *shost, uint channel, uint id, uint lun)
2111 {
2112         uint chlo, chhi;
2113         uint tgtlo, tgthi;
2114
2115         if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) ||
2116             ((id != SCAN_WILD_CARD) && (id >= shost->max_id)) ||
2117             ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun)))
2118                 return -EINVAL;
2119
2120         if (channel == SCAN_WILD_CARD) {
2121                 chlo = 0;
2122                 chhi = shost->max_channel + 1;
2123         } else {
2124                 chlo = channel;
2125                 chhi = channel + 1;
2126         }
2127
2128         if (id == SCAN_WILD_CARD) {
2129                 tgtlo = 0;
2130                 tgthi = shost->max_id;
2131         } else {
2132                 tgtlo = id;
2133                 tgthi = id + 1;
2134         }
2135
2136         for ( ; chlo < chhi; chlo++)
2137                 for ( ; tgtlo < tgthi; tgtlo++)
2138                         fc_user_scan_tgt(shost, chlo, tgtlo, lun);
2139
2140         return 0;
2141 }
2142
2143 static int fc_tsk_mgmt_response(struct Scsi_Host *shost, u64 nexus, u64 tm_id,
2144                                 int result)
2145 {
2146         struct fc_internal *i = to_fc_internal(shost->transportt);
2147         return i->f->tsk_mgmt_response(shost, nexus, tm_id, result);
2148 }
2149
2150 static int fc_it_nexus_response(struct Scsi_Host *shost, u64 nexus, int result)
2151 {
2152         struct fc_internal *i = to_fc_internal(shost->transportt);
2153         return i->f->it_nexus_response(shost, nexus, result);
2154 }
2155
2156 struct scsi_transport_template *
2157 fc_attach_transport(struct fc_function_template *ft)
2158 {
2159         int count;
2160         struct fc_internal *i = kzalloc(sizeof(struct fc_internal),
2161                                         GFP_KERNEL);
2162
2163         if (unlikely(!i))
2164                 return NULL;
2165
2166         i->t.target_attrs.ac.attrs = &i->starget_attrs[0];
2167         i->t.target_attrs.ac.class = &fc_transport_class.class;
2168         i->t.target_attrs.ac.match = fc_target_match;
2169         i->t.target_size = sizeof(struct fc_starget_attrs);
2170         transport_container_register(&i->t.target_attrs);
2171
2172         i->t.host_attrs.ac.attrs = &i->host_attrs[0];
2173         i->t.host_attrs.ac.class = &fc_host_class.class;
2174         i->t.host_attrs.ac.match = fc_host_match;
2175         i->t.host_size = sizeof(struct fc_host_attrs);
2176         if (ft->get_fc_host_stats)
2177                 i->t.host_attrs.statistics = &fc_statistics_group;
2178         transport_container_register(&i->t.host_attrs);
2179
2180         i->rport_attr_cont.ac.attrs = &i->rport_attrs[0];
2181         i->rport_attr_cont.ac.class = &fc_rport_class.class;
2182         i->rport_attr_cont.ac.match = fc_rport_match;
2183         transport_container_register(&i->rport_attr_cont);
2184
2185         i->vport_attr_cont.ac.attrs = &i->vport_attrs[0];
2186         i->vport_attr_cont.ac.class = &fc_vport_class.class;
2187         i->vport_attr_cont.ac.match = fc_vport_match;
2188         transport_container_register(&i->vport_attr_cont);
2189
2190         i->f = ft;
2191
2192         /* Transport uses the shost workq for scsi scanning */
2193         i->t.create_work_queue = 1;
2194
2195         i->t.eh_timed_out = fc_timed_out;
2196
2197         i->t.user_scan = fc_user_scan;
2198
2199         /* target-mode drivers' functions */
2200         i->t.tsk_mgmt_response = fc_tsk_mgmt_response;
2201         i->t.it_nexus_response = fc_it_nexus_response;
2202
2203         /*
2204          * Setup SCSI Target Attributes.
2205          */
2206         count = 0;
2207         SETUP_STARGET_ATTRIBUTE_RD(node_name);
2208         SETUP_STARGET_ATTRIBUTE_RD(port_name);
2209         SETUP_STARGET_ATTRIBUTE_RD(port_id);
2210
2211         BUG_ON(count > FC_STARGET_NUM_ATTRS);
2212
2213         i->starget_attrs[count] = NULL;
2214
2215
2216         /*
2217          * Setup SCSI Host Attributes.
2218          */
2219         count=0;
2220         SETUP_HOST_ATTRIBUTE_RD(node_name);
2221         SETUP_HOST_ATTRIBUTE_RD(port_name);
2222         SETUP_HOST_ATTRIBUTE_RD(permanent_port_name);
2223         SETUP_HOST_ATTRIBUTE_RD(supported_classes);
2224         SETUP_HOST_ATTRIBUTE_RD(supported_fc4s);
2225         SETUP_HOST_ATTRIBUTE_RD(supported_speeds);
2226         SETUP_HOST_ATTRIBUTE_RD(maxframe_size);
2227         if (ft->vport_create) {
2228                 SETUP_HOST_ATTRIBUTE_RD_NS(max_npiv_vports);
2229                 SETUP_HOST_ATTRIBUTE_RD_NS(npiv_vports_inuse);
2230         }
2231         SETUP_HOST_ATTRIBUTE_RD(serial_number);
2232         SETUP_HOST_ATTRIBUTE_RD(manufacturer);
2233         SETUP_HOST_ATTRIBUTE_RD(model);
2234         SETUP_HOST_ATTRIBUTE_RD(model_description);
2235         SETUP_HOST_ATTRIBUTE_RD(hardware_version);
2236         SETUP_HOST_ATTRIBUTE_RD(driver_version);
2237         SETUP_HOST_ATTRIBUTE_RD(firmware_version);
2238         SETUP_HOST_ATTRIBUTE_RD(optionrom_version);
2239
2240         SETUP_HOST_ATTRIBUTE_RD(port_id);
2241         SETUP_HOST_ATTRIBUTE_RD(port_type);
2242         SETUP_HOST_ATTRIBUTE_RD(port_state);
2243         SETUP_HOST_ATTRIBUTE_RD(active_fc4s);
2244         SETUP_HOST_ATTRIBUTE_RD(speed);
2245         SETUP_HOST_ATTRIBUTE_RD(fabric_name);
2246         SETUP_HOST_ATTRIBUTE_RD(symbolic_name);
2247         SETUP_HOST_ATTRIBUTE_RW(system_hostname);
2248
2249         /* Transport-managed attributes */
2250         SETUP_PRIVATE_HOST_ATTRIBUTE_RW(dev_loss_tmo);
2251         SETUP_PRIVATE_HOST_ATTRIBUTE_RW(tgtid_bind_type);
2252         if (ft->issue_fc_host_lip)
2253                 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(issue_lip);
2254         if (ft->vport_create)
2255                 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_create);
2256         if (ft->vport_delete)
2257                 SETUP_PRIVATE_HOST_ATTRIBUTE_RW(vport_delete);
2258
2259         BUG_ON(count > FC_HOST_NUM_ATTRS);
2260
2261         i->host_attrs[count] = NULL;
2262
2263         /*
2264          * Setup Remote Port Attributes.
2265          */
2266         count=0;
2267         SETUP_RPORT_ATTRIBUTE_RD(maxframe_size);
2268         SETUP_RPORT_ATTRIBUTE_RD(supported_classes);
2269         SETUP_RPORT_ATTRIBUTE_RW(dev_loss_tmo);
2270         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(node_name);
2271         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_name);
2272         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_id);
2273         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(roles);
2274         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_state);
2275         SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(scsi_target_id);
2276         SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(fast_io_fail_tmo);
2277
2278         BUG_ON(count > FC_RPORT_NUM_ATTRS);
2279
2280         i->rport_attrs[count] = NULL;
2281
2282         /*
2283          * Setup Virtual Port Attributes.
2284          */
2285         count=0;
2286         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_state);
2287         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_last_state);
2288         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(node_name);
2289         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(port_name);
2290         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(roles);
2291         SETUP_PRIVATE_VPORT_ATTRIBUTE_RD(vport_type);
2292         SETUP_VPORT_ATTRIBUTE_RW(symbolic_name);
2293         SETUP_VPORT_ATTRIBUTE_WR(vport_delete);
2294         SETUP_VPORT_ATTRIBUTE_WR(vport_disable);
2295
2296         BUG_ON(count > FC_VPORT_NUM_ATTRS);
2297
2298         i->vport_attrs[count] = NULL;
2299
2300         return &i->t;
2301 }
2302 EXPORT_SYMBOL(fc_attach_transport);
2303
2304 void fc_release_transport(struct scsi_transport_template *t)
2305 {
2306         struct fc_internal *i = to_fc_internal(t);
2307
2308         transport_container_unregister(&i->t.target_attrs);
2309         transport_container_unregister(&i->t.host_attrs);
2310         transport_container_unregister(&i->rport_attr_cont);
2311         transport_container_unregister(&i->vport_attr_cont);
2312
2313         kfree(i);
2314 }
2315 EXPORT_SYMBOL(fc_release_transport);
2316
2317 /**
2318  * fc_queue_work - Queue work to the fc_host workqueue.
2319  * @shost:      Pointer to Scsi_Host bound to fc_host.
2320  * @work:       Work to queue for execution.
2321  *
2322  * Return value:
2323  *      1 - work queued for execution
2324  *      0 - work is already queued
2325  *      -EINVAL - work queue doesn't exist
2326  */
2327 static int
2328 fc_queue_work(struct Scsi_Host *shost, struct work_struct *work)
2329 {
2330         if (unlikely(!fc_host_work_q(shost))) {
2331                 printk(KERN_ERR
2332                         "ERROR: FC host '%s' attempted to queue work, "
2333                         "when no workqueue created.\n", shost->hostt->name);
2334                 dump_stack();
2335
2336                 return -EINVAL;
2337         }
2338
2339         return queue_work(fc_host_work_q(shost), work);
2340 }
2341
2342 /**
2343  * fc_flush_work - Flush a fc_host's workqueue.
2344  * @shost:      Pointer to Scsi_Host bound to fc_host.
2345  */
2346 static void
2347 fc_flush_work(struct Scsi_Host *shost)
2348 {
2349         if (!fc_host_work_q(shost)) {
2350                 printk(KERN_ERR
2351                         "ERROR: FC host '%s' attempted to flush work, "
2352                         "when no workqueue created.\n", shost->hostt->name);
2353                 dump_stack();
2354                 return;
2355         }
2356
2357         flush_workqueue(fc_host_work_q(shost));
2358 }
2359
2360 /**
2361  * fc_queue_devloss_work - Schedule work for the fc_host devloss workqueue.
2362  * @shost:      Pointer to Scsi_Host bound to fc_host.
2363  * @work:       Work to queue for execution.
2364  * @delay:      jiffies to delay the work queuing
2365  *
2366  * Return value:
2367  *      1 on success / 0 already queued / < 0 for error
2368  */
2369 static int
2370 fc_queue_devloss_work(struct Scsi_Host *shost, struct delayed_work *work,
2371                                 unsigned long delay)
2372 {
2373         if (unlikely(!fc_host_devloss_work_q(shost))) {
2374                 printk(KERN_ERR
2375                         "ERROR: FC host '%s' attempted to queue work, "
2376                         "when no workqueue created.\n", shost->hostt->name);
2377                 dump_stack();
2378
2379                 return -EINVAL;
2380         }
2381
2382         return queue_delayed_work(fc_host_devloss_work_q(shost), work, delay);
2383 }
2384
2385 /**
2386  * fc_flush_devloss - Flush a fc_host's devloss workqueue.
2387  * @shost:      Pointer to Scsi_Host bound to fc_host.
2388  */
2389 static void
2390 fc_flush_devloss(struct Scsi_Host *shost)
2391 {
2392         if (!fc_host_devloss_work_q(shost)) {
2393                 printk(KERN_ERR
2394                         "ERROR: FC host '%s' attempted to flush work, "
2395                         "when no workqueue created.\n", shost->hostt->name);
2396                 dump_stack();
2397                 return;
2398         }
2399
2400         flush_workqueue(fc_host_devloss_work_q(shost));
2401 }
2402
2403
2404 /**
2405  * fc_remove_host - called to terminate any fc_transport-related elements for a scsi host.
2406  * @shost:      Which &Scsi_Host
2407  *
2408  * This routine is expected to be called immediately preceding the
2409  * a driver's call to scsi_remove_host().
2410  *
2411  * WARNING: A driver utilizing the fc_transport, which fails to call
2412  *   this routine prior to scsi_remove_host(), will leave dangling
2413  *   objects in /sys/class/fc_remote_ports. Access to any of these
2414  *   objects can result in a system crash !!!
2415  *
2416  * Notes:
2417  *      This routine assumes no locks are held on entry.
2418  */
2419 void
2420 fc_remove_host(struct Scsi_Host *shost)
2421 {
2422         struct fc_vport *vport = NULL, *next_vport = NULL;
2423         struct fc_rport *rport = NULL, *next_rport = NULL;
2424         struct workqueue_struct *work_q;
2425         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2426         unsigned long flags;
2427
2428         spin_lock_irqsave(shost->host_lock, flags);
2429
2430         /* Remove any vports */
2431         list_for_each_entry_safe(vport, next_vport, &fc_host->vports, peers)
2432                 fc_queue_work(shost, &vport->vport_delete_work);
2433
2434         /* Remove any remote ports */
2435         list_for_each_entry_safe(rport, next_rport,
2436                         &fc_host->rports, peers) {
2437                 list_del(&rport->peers);
2438                 rport->port_state = FC_PORTSTATE_DELETED;
2439                 fc_queue_work(shost, &rport->rport_delete_work);
2440         }
2441
2442         list_for_each_entry_safe(rport, next_rport,
2443                         &fc_host->rport_bindings, peers) {
2444                 list_del(&rport->peers);
2445                 rport->port_state = FC_PORTSTATE_DELETED;
2446                 fc_queue_work(shost, &rport->rport_delete_work);
2447         }
2448
2449         spin_unlock_irqrestore(shost->host_lock, flags);
2450
2451         /* flush all scan work items */
2452         scsi_flush_work(shost);
2453
2454         /* flush all stgt delete, and rport delete work items, then kill it  */
2455         if (fc_host->work_q) {
2456                 work_q = fc_host->work_q;
2457                 fc_host->work_q = NULL;
2458                 destroy_workqueue(work_q);
2459         }
2460
2461         /* flush all devloss work items, then kill it  */
2462         if (fc_host->devloss_work_q) {
2463                 work_q = fc_host->devloss_work_q;
2464                 fc_host->devloss_work_q = NULL;
2465                 destroy_workqueue(work_q);
2466         }
2467 }
2468 EXPORT_SYMBOL(fc_remove_host);
2469
2470 static void fc_terminate_rport_io(struct fc_rport *rport)
2471 {
2472         struct Scsi_Host *shost = rport_to_shost(rport);
2473         struct fc_internal *i = to_fc_internal(shost->transportt);
2474
2475         /* Involve the LLDD if possible to terminate all io on the rport. */
2476         if (i->f->terminate_rport_io)
2477                 i->f->terminate_rport_io(rport);
2478
2479         /*
2480          * must unblock to flush queued IO. The caller will have set
2481          * the port_state or flags, so that fc_remote_port_chkready will
2482          * fail IO.
2483          */
2484         scsi_target_unblock(&rport->dev);
2485 }
2486
2487 /**
2488  * fc_starget_delete - called to delete the scsi descendants of an rport
2489  * @work:       remote port to be operated on.
2490  *
2491  * Deletes target and all sdevs.
2492  */
2493 static void
2494 fc_starget_delete(struct work_struct *work)
2495 {
2496         struct fc_rport *rport =
2497                 container_of(work, struct fc_rport, stgt_delete_work);
2498
2499         fc_terminate_rport_io(rport);
2500         scsi_remove_target(&rport->dev);
2501 }
2502
2503
2504 /**
2505  * fc_rport_final_delete - finish rport termination and delete it.
2506  * @work:       remote port to be deleted.
2507  */
2508 static void
2509 fc_rport_final_delete(struct work_struct *work)
2510 {
2511         struct fc_rport *rport =
2512                 container_of(work, struct fc_rport, rport_delete_work);
2513         struct device *dev = &rport->dev;
2514         struct Scsi_Host *shost = rport_to_shost(rport);
2515         struct fc_internal *i = to_fc_internal(shost->transportt);
2516         unsigned long flags;
2517         int do_callback = 0;
2518
2519         fc_terminate_rport_io(rport);
2520
2521         /*
2522          * if a scan is pending, flush the SCSI Host work_q so that
2523          * that we can reclaim the rport scan work element.
2524          */
2525         if (rport->flags & FC_RPORT_SCAN_PENDING)
2526                 scsi_flush_work(shost);
2527
2528         /*
2529          * Cancel any outstanding timers. These should really exist
2530          * only when rmmod'ing the LLDD and we're asking for
2531          * immediate termination of the rports
2532          */
2533         spin_lock_irqsave(shost->host_lock, flags);
2534         if (rport->flags & FC_RPORT_DEVLOSS_PENDING) {
2535                 spin_unlock_irqrestore(shost->host_lock, flags);
2536                 if (!cancel_delayed_work(&rport->fail_io_work))
2537                         fc_flush_devloss(shost);
2538                 if (!cancel_delayed_work(&rport->dev_loss_work))
2539                         fc_flush_devloss(shost);
2540                 spin_lock_irqsave(shost->host_lock, flags);
2541                 rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
2542         }
2543         spin_unlock_irqrestore(shost->host_lock, flags);
2544
2545         /* Delete SCSI target and sdevs */
2546         if (rport->scsi_target_id != -1)
2547                 fc_starget_delete(&rport->stgt_delete_work);
2548
2549         /*
2550          * Notify the driver that the rport is now dead. The LLDD will
2551          * also guarantee that any communication to the rport is terminated
2552          *
2553          * Avoid this call if we already called it when we preserved the
2554          * rport for the binding.
2555          */
2556         spin_lock_irqsave(shost->host_lock, flags);
2557         if (!(rport->flags & FC_RPORT_DEVLOSS_CALLBK_DONE) &&
2558             (i->f->dev_loss_tmo_callbk)) {
2559                 rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
2560                 do_callback = 1;
2561         }
2562         spin_unlock_irqrestore(shost->host_lock, flags);
2563
2564         if (do_callback)
2565                 i->f->dev_loss_tmo_callbk(rport);
2566
2567         fc_bsg_remove(rport->rqst_q);
2568
2569         transport_remove_device(dev);
2570         device_del(dev);
2571         transport_destroy_device(dev);
2572         put_device(&shost->shost_gendev);       /* for fc_host->rport list */
2573         put_device(dev);                        /* for self-reference */
2574 }
2575
2576
2577 /**
2578  * fc_rport_create - allocates and creates a remote FC port.
2579  * @shost:      scsi host the remote port is connected to.
2580  * @channel:    Channel on shost port connected to.
2581  * @ids:        The world wide names, fc address, and FC4 port
2582  *              roles for the remote port.
2583  *
2584  * Allocates and creates the remoter port structure, including the
2585  * class and sysfs creation.
2586  *
2587  * Notes:
2588  *      This routine assumes no locks are held on entry.
2589  */
2590 static struct fc_rport *
2591 fc_rport_create(struct Scsi_Host *shost, int channel,
2592         struct fc_rport_identifiers  *ids)
2593 {
2594         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2595         struct fc_internal *fci = to_fc_internal(shost->transportt);
2596         struct fc_rport *rport;
2597         struct device *dev;
2598         unsigned long flags;
2599         int error;
2600         size_t size;
2601
2602         size = (sizeof(struct fc_rport) + fci->f->dd_fcrport_size);
2603         rport = kzalloc(size, GFP_KERNEL);
2604         if (unlikely(!rport)) {
2605                 printk(KERN_ERR "%s: allocation failure\n", __func__);
2606                 return NULL;
2607         }
2608
2609         rport->maxframe_size = -1;
2610         rport->supported_classes = FC_COS_UNSPECIFIED;
2611         rport->dev_loss_tmo = fc_host->dev_loss_tmo;
2612         memcpy(&rport->node_name, &ids->node_name, sizeof(rport->node_name));
2613         memcpy(&rport->port_name, &ids->port_name, sizeof(rport->port_name));
2614         rport->port_id = ids->port_id;
2615         rport->roles = ids->roles;
2616         rport->port_state = FC_PORTSTATE_ONLINE;
2617         if (fci->f->dd_fcrport_size)
2618                 rport->dd_data = &rport[1];
2619         rport->channel = channel;
2620         rport->fast_io_fail_tmo = -1;
2621
2622         INIT_DELAYED_WORK(&rport->dev_loss_work, fc_timeout_deleted_rport);
2623         INIT_DELAYED_WORK(&rport->fail_io_work, fc_timeout_fail_rport_io);
2624         INIT_WORK(&rport->scan_work, fc_scsi_scan_rport);
2625         INIT_WORK(&rport->stgt_delete_work, fc_starget_delete);
2626         INIT_WORK(&rport->rport_delete_work, fc_rport_final_delete);
2627
2628         spin_lock_irqsave(shost->host_lock, flags);
2629
2630         rport->number = fc_host->next_rport_number++;
2631         if (rport->roles & FC_PORT_ROLE_FCP_TARGET)
2632                 rport->scsi_target_id = fc_host->next_target_id++;
2633         else
2634                 rport->scsi_target_id = -1;
2635         list_add_tail(&rport->peers, &fc_host->rports);
2636         get_device(&shost->shost_gendev);       /* for fc_host->rport list */
2637
2638         spin_unlock_irqrestore(shost->host_lock, flags);
2639
2640         dev = &rport->dev;
2641         device_initialize(dev);                 /* takes self reference */
2642         dev->parent = get_device(&shost->shost_gendev); /* parent reference */
2643         dev->release = fc_rport_dev_release;
2644         dev_set_name(dev, "rport-%d:%d-%d",
2645                      shost->host_no, channel, rport->number);
2646         transport_setup_device(dev);
2647
2648         error = device_add(dev);
2649         if (error) {
2650                 printk(KERN_ERR "FC Remote Port device_add failed\n");
2651                 goto delete_rport;
2652         }
2653         transport_add_device(dev);
2654         transport_configure_device(dev);
2655
2656         fc_bsg_rportadd(shost, rport);
2657         /* ignore any bsg add error - we just can't do sgio */
2658
2659         if (rport->roles & FC_PORT_ROLE_FCP_TARGET) {
2660                 /* initiate a scan of the target */
2661                 rport->flags |= FC_RPORT_SCAN_PENDING;
2662                 scsi_queue_work(shost, &rport->scan_work);
2663         }
2664
2665         return rport;
2666
2667 delete_rport:
2668         transport_destroy_device(dev);
2669         spin_lock_irqsave(shost->host_lock, flags);
2670         list_del(&rport->peers);
2671         put_device(&shost->shost_gendev);       /* for fc_host->rport list */
2672         spin_unlock_irqrestore(shost->host_lock, flags);
2673         put_device(dev->parent);
2674         kfree(rport);
2675         return NULL;
2676 }
2677
2678 /**
2679  * fc_remote_port_add - notify fc transport of the existence of a remote FC port.
2680  * @shost:      scsi host the remote port is connected to.
2681  * @channel:    Channel on shost port connected to.
2682  * @ids:        The world wide names, fc address, and FC4 port
2683  *              roles for the remote port.
2684  *
2685  * The LLDD calls this routine to notify the transport of the existence
2686  * of a remote port. The LLDD provides the unique identifiers (wwpn,wwn)
2687  * of the port, it's FC address (port_id), and the FC4 roles that are
2688  * active for the port.
2689  *
2690  * For ports that are FCP targets (aka scsi targets), the FC transport
2691  * maintains consistent target id bindings on behalf of the LLDD.
2692  * A consistent target id binding is an assignment of a target id to
2693  * a remote port identifier, which persists while the scsi host is
2694  * attached. The remote port can disappear, then later reappear, and
2695  * it's target id assignment remains the same. This allows for shifts
2696  * in FC addressing (if binding by wwpn or wwnn) with no apparent
2697  * changes to the scsi subsystem which is based on scsi host number and
2698  * target id values.  Bindings are only valid during the attachment of
2699  * the scsi host. If the host detaches, then later re-attaches, target
2700  * id bindings may change.
2701  *
2702  * This routine is responsible for returning a remote port structure.
2703  * The routine will search the list of remote ports it maintains
2704  * internally on behalf of consistent target id mappings. If found, the
2705  * remote port structure will be reused. Otherwise, a new remote port
2706  * structure will be allocated.
2707  *
2708  * Whenever a remote port is allocated, a new fc_remote_port class
2709  * device is created.
2710  *
2711  * Should not be called from interrupt context.
2712  *
2713  * Notes:
2714  *      This routine assumes no locks are held on entry.
2715  */
2716 struct fc_rport *
2717 fc_remote_port_add(struct Scsi_Host *shost, int channel,
2718         struct fc_rport_identifiers  *ids)
2719 {
2720         struct fc_internal *fci = to_fc_internal(shost->transportt);
2721         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
2722         struct fc_rport *rport;
2723         unsigned long flags;
2724         int match = 0;
2725
2726         /* ensure any stgt delete functions are done */
2727         fc_flush_work(shost);
2728
2729         /*
2730          * Search the list of "active" rports, for an rport that has been
2731          * deleted, but we've held off the real delete while the target
2732          * is in a "blocked" state.
2733          */
2734         spin_lock_irqsave(shost->host_lock, flags);
2735
2736         list_for_each_entry(rport, &fc_host->rports, peers) {
2737
2738                 if ((rport->port_state == FC_PORTSTATE_BLOCKED) &&
2739                         (rport->channel == channel)) {
2740
2741                         switch (fc_host->tgtid_bind_type) {
2742                         case FC_TGTID_BIND_BY_WWPN:
2743                         case FC_TGTID_BIND_NONE:
2744                                 if (rport->port_name == ids->port_name)
2745                                         match = 1;
2746                                 break;
2747                         case FC_TGTID_BIND_BY_WWNN:
2748                                 if (rport->node_name == ids->node_name)
2749                                         match = 1;
2750                                 break;
2751                         case FC_TGTID_BIND_BY_ID:
2752                                 if (rport->port_id == ids->port_id)
2753                                         match = 1;
2754                                 break;
2755                         }
2756
2757                         if (match) {
2758
2759                                 memcpy(&rport->node_name, &ids->node_name,
2760                                         sizeof(rport->node_name));
2761                                 memcpy(&rport->port_name, &ids->port_name,
2762                                         sizeof(rport->port_name));
2763                                 rport->port_id = ids->port_id;
2764
2765                                 rport->port_state = FC_PORTSTATE_ONLINE;
2766                                 rport->roles = ids->roles;
2767
2768                                 spin_unlock_irqrestore(shost->host_lock, flags);
2769
2770                                 if (fci->f->dd_fcrport_size)
2771                                         memset(rport->dd_data, 0,
2772                                                 fci->f->dd_fcrport_size);
2773
2774                                 /*
2775                                  * If we were not a target, cancel the
2776                                  * io terminate and rport timers, and
2777                                  * we're done.
2778                                  *
2779                                  * If we were a target, but our new role
2780                                  * doesn't indicate a target, leave the
2781                                  * timers running expecting the role to
2782                                  * change as the target fully logs in. If
2783                                  * it doesn't, the target will be torn down.
2784                                  *
2785                                  * If we were a target, and our role shows
2786                                  * we're still a target, cancel the timers
2787                                  * and kick off a scan.
2788                                  */
2789
2790                                 /* was a target, not in roles */
2791                                 if ((rport->scsi_target_id != -1) &&
2792                                     (!(ids->roles & FC_PORT_ROLE_FCP_TARGET)))
2793                                         return rport;
2794
2795                                 /*
2796                                  * Stop the fail io and dev_loss timers.
2797                                  * If they flush, the port_state will
2798                                  * be checked and will NOOP the function.
2799                                  */
2800                                 if (!cancel_delayed_work(&rport->fail_io_work))
2801                                         fc_flush_devloss(shost);
2802                                 if (!cancel_delayed_work(&rport->dev_loss_work))
2803                                         fc_flush_devloss(shost);
2804
2805                                 spin_lock_irqsave(shost->host_lock, flags);
2806
2807                                 rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
2808                                                   FC_RPORT_DEVLOSS_PENDING |
2809                                                   FC_RPORT_DEVLOSS_CALLBK_DONE);
2810
2811                                 /* if target, initiate a scan */
2812                                 if (rport->scsi_target_id != -1) {
2813                                         rport->flags |= FC_RPORT_SCAN_PENDING;
2814                                         scsi_queue_work(shost,
2815                                                         &rport->scan_work);
2816                                         spin_unlock_irqrestore(shost->host_lock,
2817                                                         flags);
2818                                         scsi_target_unblock(&rport->dev);
2819                                 } else
2820                                         spin_unlock_irqrestore(shost->host_lock,
2821                                                         flags);
2822
2823                                 fc_bsg_goose_queue(rport);
2824
2825                                 return rport;
2826                         }
2827                 }
2828         }
2829
2830         /*
2831          * Search the bindings array
2832          * Note: if never a FCP target, you won't be on this list
2833          */
2834         if (fc_host->tgtid_bind_type != FC_TGTID_BIND_NONE) {
2835
2836                 /* search for a matching consistent binding */
2837
2838                 list_for_each_entry(rport, &fc_host->rport_bindings,
2839                                         peers) {
2840                         if (rport->channel != channel)
2841                                 continue;
2842
2843                         switch (fc_host->tgtid_bind_type) {
2844                         case FC_TGTID_BIND_BY_WWPN:
2845                                 if (rport->port_name == ids->port_name)
2846                                         match = 1;
2847                                 break;
2848                         case FC_TGTID_BIND_BY_WWNN:
2849                                 if (rport->node_name == ids->node_name)
2850                                         match = 1;
2851                                 break;
2852                         case FC_TGTID_BIND_BY_ID:
2853                                 if (rport->port_id == ids->port_id)
2854                                         match = 1;
2855                                 break;
2856                         case FC_TGTID_BIND_NONE: /* to keep compiler happy */
2857                                 break;
2858                         }
2859
2860                         if (match) {
2861                                 list_move_tail(&rport->peers, &fc_host->rports);
2862                                 break;
2863                         }
2864                 }
2865
2866                 if (match) {
2867                         memcpy(&rport->node_name, &ids->node_name,
2868                                 sizeof(rport->node_name));
2869                         memcpy(&rport->port_name, &ids->port_name,
2870                                 sizeof(rport->port_name));
2871                         rport->port_id = ids->port_id;
2872                         rport->roles = ids->roles;
2873                         rport->port_state = FC_PORTSTATE_ONLINE;
2874                         rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
2875
2876                         if (fci->f->dd_fcrport_size)
2877                                 memset(rport->dd_data, 0,
2878                                                 fci->f->dd_fcrport_size);
2879
2880                         if (rport->roles & FC_PORT_ROLE_FCP_TARGET) {
2881                                 /* initiate a scan of the target */
2882                                 rport->flags |= FC_RPORT_SCAN_PENDING;
2883                                 scsi_queue_work(shost, &rport->scan_work);
2884                                 spin_unlock_irqrestore(shost->host_lock, flags);
2885                                 scsi_target_unblock(&rport->dev);
2886                         } else
2887                                 spin_unlock_irqrestore(shost->host_lock, flags);
2888
2889                         return rport;
2890                 }
2891         }
2892
2893         spin_unlock_irqrestore(shost->host_lock, flags);
2894
2895         /* No consistent binding found - create new remote port entry */
2896         rport = fc_rport_create(shost, channel, ids);
2897
2898         return rport;
2899 }
2900 EXPORT_SYMBOL(fc_remote_port_add);
2901
2902
2903 /**
2904  * fc_remote_port_delete - notifies the fc transport that a remote port is no longer in existence.
2905  * @rport:      The remote port that no longer exists
2906  *
2907  * The LLDD calls this routine to notify the transport that a remote
2908  * port is no longer part of the topology. Note: Although a port
2909  * may no longer be part of the topology, it may persist in the remote
2910  * ports displayed by the fc_host. We do this under 2 conditions:
2911  * 1) If the port was a scsi target, we delay its deletion by "blocking" it.
2912  *   This allows the port to temporarily disappear, then reappear without
2913  *   disrupting the SCSI device tree attached to it. During the "blocked"
2914  *   period the port will still exist.
2915  * 2) If the port was a scsi target and disappears for longer than we
2916  *   expect, we'll delete the port and the tear down the SCSI device tree
2917  *   attached to it. However, we want to semi-persist the target id assigned
2918  *   to that port if it eventually does exist. The port structure will
2919  *   remain (although with minimal information) so that the target id
2920  *   bindings remails.
2921  *
2922  * If the remote port is not an FCP Target, it will be fully torn down
2923  * and deallocated, including the fc_remote_port class device.
2924  *
2925  * If the remote port is an FCP Target, the port will be placed in a
2926  * temporary blocked state. From the LLDD's perspective, the rport no
2927  * longer exists. From the SCSI midlayer's perspective, the SCSI target
2928  * exists, but all sdevs on it are blocked from further I/O. The following
2929  * is then expected.
2930  *
2931  *   If the remote port does not return (signaled by a LLDD call to
2932  *   fc_remote_port_add()) within the dev_loss_tmo timeout, then the
2933  *   scsi target is removed - killing all outstanding i/o and removing the
2934  *   scsi devices attached ot it. The port structure will be marked Not
2935  *   Present and be partially cleared, leaving only enough information to
2936  *   recognize the remote port relative to the scsi target id binding if
2937  *   it later appears.  The port will remain as long as there is a valid
2938  *   binding (e.g. until the user changes the binding type or unloads the
2939  *   scsi host with the binding).
2940  *
2941  *   If the remote port returns within the dev_loss_tmo value (and matches
2942  *   according to the target id binding type), the port structure will be
2943  *   reused. If it is no longer a SCSI target, the target will be torn
2944  *   down. If it continues to be a SCSI target, then the target will be
2945  *   unblocked (allowing i/o to be resumed), and a scan will be activated
2946  *   to ensure that all luns are detected.
2947  *
2948  * Called from normal process context only - cannot be called from interrupt.
2949  *
2950  * Notes:
2951  *      This routine assumes no locks are held on entry.
2952  */
2953 void
2954 fc_remote_port_delete(struct fc_rport  *rport)
2955 {
2956         struct Scsi_Host *shost = rport_to_shost(rport);
2957         unsigned long timeout = rport->dev_loss_tmo;
2958         unsigned long flags;
2959
2960         /*
2961          * No need to flush the fc_host work_q's, as all adds are synchronous.
2962          *
2963          * We do need to reclaim the rport scan work element, so eventually
2964          * (in fc_rport_final_delete()) we'll flush the scsi host work_q if
2965          * there's still a scan pending.
2966          */
2967
2968         spin_lock_irqsave(shost->host_lock, flags);
2969
2970         if (rport->port_state != FC_PORTSTATE_ONLINE) {
2971                 spin_unlock_irqrestore(shost->host_lock, flags);
2972                 return;
2973         }
2974
2975         /*
2976          * In the past, we if this was not an FCP-Target, we would
2977          * unconditionally just jump to deleting the rport.
2978          * However, rports can be used as node containers by the LLDD,
2979          * and its not appropriate to just terminate the rport at the
2980          * first sign of a loss in connectivity. The LLDD may want to
2981          * send ELS traffic to re-validate the login. If the rport is
2982          * immediately deleted, it makes it inappropriate for a node
2983          * container.
2984          * So... we now unconditionally wait dev_loss_tmo before
2985          * destroying an rport.
2986          */
2987
2988         rport->port_state = FC_PORTSTATE_BLOCKED;
2989
2990         rport->flags |= FC_RPORT_DEVLOSS_PENDING;
2991
2992         spin_unlock_irqrestore(shost->host_lock, flags);
2993
2994         if (rport->roles & FC_PORT_ROLE_FCP_INITIATOR &&
2995             shost->active_mode & MODE_TARGET)
2996                 fc_tgt_it_nexus_destroy(shost, (unsigned long)rport);
2997
2998         scsi_target_block(&rport->dev);
2999
3000         /* see if we need to kill io faster than waiting for device loss */
3001         if ((rport->fast_io_fail_tmo != -1) &&
3002             (rport->fast_io_fail_tmo < timeout))
3003                 fc_queue_devloss_work(shost, &rport->fail_io_work,
3004                                         rport->fast_io_fail_tmo * HZ);
3005
3006         /* cap the length the devices can be blocked until they are deleted */
3007         fc_queue_devloss_work(shost, &rport->dev_loss_work, timeout * HZ);
3008 }
3009 EXPORT_SYMBOL(fc_remote_port_delete);
3010
3011 /**
3012  * fc_remote_port_rolechg - notifies the fc transport that the roles on a remote may have changed.
3013  * @rport:      The remote port that changed.
3014  * @roles:      New roles for this port.
3015  *
3016  * Description: The LLDD calls this routine to notify the transport that the
3017  * roles on a remote port may have changed. The largest effect of this is
3018  * if a port now becomes a FCP Target, it must be allocated a
3019  * scsi target id.  If the port is no longer a FCP target, any
3020  * scsi target id value assigned to it will persist in case the
3021  * role changes back to include FCP Target. No changes in the scsi
3022  * midlayer will be invoked if the role changes (in the expectation
3023  * that the role will be resumed. If it doesn't normal error processing
3024  * will take place).
3025  *
3026  * Should not be called from interrupt context.
3027  *
3028  * Notes:
3029  *      This routine assumes no locks are held on entry.
3030  */
3031 void
3032 fc_remote_port_rolechg(struct fc_rport  *rport, u32 roles)
3033 {
3034         struct Scsi_Host *shost = rport_to_shost(rport);
3035         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3036         unsigned long flags;
3037         int create = 0;
3038         int ret;
3039
3040         spin_lock_irqsave(shost->host_lock, flags);
3041         if (roles & FC_PORT_ROLE_FCP_TARGET) {
3042                 if (rport->scsi_target_id == -1) {
3043                         rport->scsi_target_id = fc_host->next_target_id++;
3044                         create = 1;
3045                 } else if (!(rport->roles & FC_PORT_ROLE_FCP_TARGET))
3046                         create = 1;
3047         } else if (shost->active_mode & MODE_TARGET) {
3048                 ret = fc_tgt_it_nexus_create(shost, (unsigned long)rport,
3049                                              (char *)&rport->node_name);
3050                 if (ret)
3051                         printk(KERN_ERR "FC Remore Port tgt nexus failed %d\n",
3052                                ret);
3053         }
3054
3055         rport->roles = roles;
3056
3057         spin_unlock_irqrestore(shost->host_lock, flags);
3058
3059         if (create) {
3060                 /*
3061                  * There may have been a delete timer running on the
3062                  * port. Ensure that it is cancelled as we now know
3063                  * the port is an FCP Target.
3064                  * Note: we know the rport is exists and in an online
3065                  *  state as the LLDD would not have had an rport
3066                  *  reference to pass us.
3067                  *
3068                  * Take no action on the del_timer failure as the state
3069                  * machine state change will validate the
3070                  * transaction.
3071                  */
3072                 if (!cancel_delayed_work(&rport->fail_io_work))
3073                         fc_flush_devloss(shost);
3074                 if (!cancel_delayed_work(&rport->dev_loss_work))
3075                         fc_flush_devloss(shost);
3076
3077                 spin_lock_irqsave(shost->host_lock, flags);
3078                 rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
3079                                   FC_RPORT_DEVLOSS_PENDING |
3080                                   FC_RPORT_DEVLOSS_CALLBK_DONE);
3081                 spin_unlock_irqrestore(shost->host_lock, flags);
3082
3083                 /* ensure any stgt delete functions are done */
3084                 fc_flush_work(shost);
3085
3086                 /* initiate a scan of the target */
3087                 spin_lock_irqsave(shost->host_lock, flags);
3088                 rport->flags |= FC_RPORT_SCAN_PENDING;
3089                 scsi_queue_work(shost, &rport->scan_work);
3090                 spin_unlock_irqrestore(shost->host_lock, flags);
3091                 scsi_target_unblock(&rport->dev);
3092         }
3093 }
3094 EXPORT_SYMBOL(fc_remote_port_rolechg);
3095
3096 /**
3097  * fc_timeout_deleted_rport - Timeout handler for a deleted remote port.
3098  * @work:       rport target that failed to reappear in the allotted time.
3099  *
3100  * Description: An attempt to delete a remote port blocks, and if it fails
3101  *              to return in the allotted time this gets called.
3102  */
3103 static void
3104 fc_timeout_deleted_rport(struct work_struct *work)
3105 {
3106         struct fc_rport *rport =
3107                 container_of(work, struct fc_rport, dev_loss_work.work);
3108         struct Scsi_Host *shost = rport_to_shost(rport);
3109         struct fc_internal *i = to_fc_internal(shost->transportt);
3110         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3111         unsigned long flags;
3112         int do_callback = 0;
3113
3114         spin_lock_irqsave(shost->host_lock, flags);
3115
3116         rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
3117
3118         /*
3119          * If the port is ONLINE, then it came back. If it was a SCSI
3120          * target, validate it still is. If not, tear down the
3121          * scsi_target on it.
3122          */
3123         if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
3124             (rport->scsi_target_id != -1) &&
3125             !(rport->roles & FC_PORT_ROLE_FCP_TARGET)) {
3126                 dev_printk(KERN_ERR, &rport->dev,
3127                         "blocked FC remote port time out: no longer"
3128                         " a FCP target, removing starget\n");
3129                 spin_unlock_irqrestore(shost->host_lock, flags);
3130                 scsi_target_unblock(&rport->dev);
3131                 fc_queue_work(shost, &rport->stgt_delete_work);
3132                 return;
3133         }
3134
3135         /* NOOP state - we're flushing workq's */
3136         if (rport->port_state != FC_PORTSTATE_BLOCKED) {
3137                 spin_unlock_irqrestore(shost->host_lock, flags);
3138                 dev_printk(KERN_ERR, &rport->dev,
3139                         "blocked FC remote port time out: leaving"
3140                         " rport%s alone\n",
3141                         (rport->scsi_target_id != -1) ?  " and starget" : "");
3142                 return;
3143         }
3144
3145         if ((fc_host->tgtid_bind_type == FC_TGTID_BIND_NONE) ||
3146             (rport->scsi_target_id == -1)) {
3147                 list_del(&rport->peers);
3148                 rport->port_state = FC_PORTSTATE_DELETED;
3149                 dev_printk(KERN_ERR, &rport->dev,
3150                         "blocked FC remote port time out: removing"
3151                         " rport%s\n",
3152                         (rport->scsi_target_id != -1) ?  " and starget" : "");
3153                 fc_queue_work(shost, &rport->rport_delete_work);
3154                 spin_unlock_irqrestore(shost->host_lock, flags);
3155                 return;
3156         }
3157
3158         dev_printk(KERN_ERR, &rport->dev,
3159                 "blocked FC remote port time out: removing target and "
3160                 "saving binding\n");
3161
3162         list_move_tail(&rport->peers, &fc_host->rport_bindings);
3163
3164         /*
3165          * Note: We do not remove or clear the hostdata area. This allows
3166          *   host-specific target data to persist along with the
3167          *   scsi_target_id. It's up to the host to manage it's hostdata area.
3168          */
3169
3170         /*
3171          * Reinitialize port attributes that may change if the port comes back.
3172          */
3173         rport->maxframe_size = -1;
3174         rport->supported_classes = FC_COS_UNSPECIFIED;
3175         rport->roles = FC_PORT_ROLE_UNKNOWN;
3176         rport->port_state = FC_PORTSTATE_NOTPRESENT;
3177         rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
3178
3179         /*
3180          * Pre-emptively kill I/O rather than waiting for the work queue
3181          * item to teardown the starget. (FCOE libFC folks prefer this
3182          * and to have the rport_port_id still set when it's done).
3183          */
3184         spin_unlock_irqrestore(shost->host_lock, flags);
3185         fc_terminate_rport_io(rport);
3186
3187         spin_lock_irqsave(shost->host_lock, flags);
3188
3189         if (rport->port_state == FC_PORTSTATE_NOTPRESENT) {     /* still missing */
3190
3191                 /* remove the identifiers that aren't used in the consisting binding */
3192                 switch (fc_host->tgtid_bind_type) {
3193                 case FC_TGTID_BIND_BY_WWPN:
3194                         rport->node_name = -1;
3195                         rport->port_id = -1;
3196                         break;
3197                 case FC_TGTID_BIND_BY_WWNN:
3198                         rport->port_name = -1;
3199                         rport->port_id = -1;
3200                         break;
3201                 case FC_TGTID_BIND_BY_ID:
3202                         rport->node_name = -1;
3203                         rport->port_name = -1;
3204                         break;
3205                 case FC_TGTID_BIND_NONE:        /* to keep compiler happy */
3206                         break;
3207                 }
3208
3209                 /*
3210                  * As this only occurs if the remote port (scsi target)
3211                  * went away and didn't come back - we'll remove
3212                  * all attached scsi devices.
3213                  */
3214                 rport->flags |= FC_RPORT_DEVLOSS_CALLBK_DONE;
3215                 fc_queue_work(shost, &rport->stgt_delete_work);
3216
3217                 do_callback = 1;
3218         }
3219
3220         spin_unlock_irqrestore(shost->host_lock, flags);
3221
3222         /*
3223          * Notify the driver that the rport is now dead. The LLDD will
3224          * also guarantee that any communication to the rport is terminated
3225          *
3226          * Note: we set the CALLBK_DONE flag above to correspond
3227          */
3228         if (do_callback && i->f->dev_loss_tmo_callbk)
3229                 i->f->dev_loss_tmo_callbk(rport);
3230 }
3231
3232
3233 /**
3234  * fc_timeout_fail_rport_io - Timeout handler for a fast io failing on a disconnected SCSI target.
3235  * @work:       rport to terminate io on.
3236  *
3237  * Notes: Only requests the failure of the io, not that all are flushed
3238  *    prior to returning.
3239  */
3240 static void
3241 fc_timeout_fail_rport_io(struct work_struct *work)
3242 {
3243         struct fc_rport *rport =
3244                 container_of(work, struct fc_rport, fail_io_work.work);
3245
3246         if (rport->port_state != FC_PORTSTATE_BLOCKED)
3247                 return;
3248
3249         rport->flags |= FC_RPORT_FAST_FAIL_TIMEDOUT;
3250         fc_terminate_rport_io(rport);
3251 }
3252
3253 /**
3254  * fc_scsi_scan_rport - called to perform a scsi scan on a remote port.
3255  * @work:       remote port to be scanned.
3256  */
3257 static void
3258 fc_scsi_scan_rport(struct work_struct *work)
3259 {
3260         struct fc_rport *rport =
3261                 container_of(work, struct fc_rport, scan_work);
3262         struct Scsi_Host *shost = rport_to_shost(rport);
3263         struct fc_internal *i = to_fc_internal(shost->transportt);
3264         unsigned long flags;
3265
3266         if ((rport->port_state == FC_PORTSTATE_ONLINE) &&
3267             (rport->roles & FC_PORT_ROLE_FCP_TARGET) &&
3268             !(i->f->disable_target_scan)) {
3269                 scsi_scan_target(&rport->dev, rport->channel,
3270                         rport->scsi_target_id, SCAN_WILD_CARD, 1);
3271         }
3272
3273         spin_lock_irqsave(shost->host_lock, flags);
3274         rport->flags &= ~FC_RPORT_SCAN_PENDING;
3275         spin_unlock_irqrestore(shost->host_lock, flags);
3276 }
3277
3278 /**
3279  * fc_block_scsi_eh - Block SCSI eh thread for blocked fc_rport
3280  * @cmnd: SCSI command that scsi_eh is trying to recover
3281  *
3282  * This routine can be called from a FC LLD scsi_eh callback. It
3283  * blocks the scsi_eh thread until the fc_rport leaves the
3284  * FC_PORTSTATE_BLOCKED, or the fast_io_fail_tmo fires. This is
3285  * necessary to avoid the scsi_eh failing recovery actions for blocked
3286  * rports which would lead to offlined SCSI devices.
3287  *
3288  * Returns: 0 if the fc_rport left the state FC_PORTSTATE_BLOCKED.
3289  *          FAST_IO_FAIL if the fast_io_fail_tmo fired, this should be
3290  *          passed back to scsi_eh.
3291  */
3292 int fc_block_scsi_eh(struct scsi_cmnd *cmnd)
3293 {
3294         struct Scsi_Host *shost = cmnd->device->host;
3295         struct fc_rport *rport = starget_to_rport(scsi_target(cmnd->device));
3296         unsigned long flags;
3297
3298         spin_lock_irqsave(shost->host_lock, flags);
3299         while (rport->port_state == FC_PORTSTATE_BLOCKED &&
3300                !(rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT)) {
3301                 spin_unlock_irqrestore(shost->host_lock, flags);
3302                 msleep(1000);
3303                 spin_lock_irqsave(shost->host_lock, flags);
3304         }
3305         spin_unlock_irqrestore(shost->host_lock, flags);
3306
3307         if (rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT)
3308                 return FAST_IO_FAIL;
3309
3310         return 0;
3311 }
3312 EXPORT_SYMBOL(fc_block_scsi_eh);
3313
3314 /**
3315  * fc_vport_setup - allocates and creates a FC virtual port.
3316  * @shost:      scsi host the virtual port is connected to.
3317  * @channel:    Channel on shost port connected to.
3318  * @pdev:       parent device for vport
3319  * @ids:        The world wide names, FC4 port roles, etc for
3320  *              the virtual port.
3321  * @ret_vport:  The pointer to the created vport.
3322  *
3323  * Allocates and creates the vport structure, calls the parent host
3324  * to instantiate the vport, the completes w/ class and sysfs creation.
3325  *
3326  * Notes:
3327  *      This routine assumes no locks are held on entry.
3328  */
3329 static int
3330 fc_vport_setup(struct Scsi_Host *shost, int channel, struct device *pdev,
3331         struct fc_vport_identifiers  *ids, struct fc_vport **ret_vport)
3332 {
3333         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3334         struct fc_internal *fci = to_fc_internal(shost->transportt);
3335         struct fc_vport *vport;
3336         struct device *dev;
3337         unsigned long flags;
3338         size_t size;
3339         int error;
3340
3341         *ret_vport = NULL;
3342
3343         if ( ! fci->f->vport_create)
3344                 return -ENOENT;
3345
3346         size = (sizeof(struct fc_vport) + fci->f->dd_fcvport_size);
3347         vport = kzalloc(size, GFP_KERNEL);
3348         if (unlikely(!vport)) {
3349                 printk(KERN_ERR "%s: allocation failure\n", __func__);
3350                 return -ENOMEM;
3351         }
3352
3353         vport->vport_state = FC_VPORT_UNKNOWN;
3354         vport->vport_last_state = FC_VPORT_UNKNOWN;
3355         vport->node_name = ids->node_name;
3356         vport->port_name = ids->port_name;
3357         vport->roles = ids->roles;
3358         vport->vport_type = ids->vport_type;
3359         if (fci->f->dd_fcvport_size)
3360                 vport->dd_data = &vport[1];
3361         vport->shost = shost;
3362         vport->channel = channel;
3363         vport->flags = FC_VPORT_CREATING;
3364         INIT_WORK(&vport->vport_delete_work, fc_vport_sched_delete);
3365
3366         spin_lock_irqsave(shost->host_lock, flags);
3367
3368         if (fc_host->npiv_vports_inuse >= fc_host->max_npiv_vports) {
3369                 spin_unlock_irqrestore(shost->host_lock, flags);
3370                 kfree(vport);
3371                 return -ENOSPC;
3372         }
3373         fc_host->npiv_vports_inuse++;
3374         vport->number = fc_host->next_vport_number++;
3375         list_add_tail(&vport->peers, &fc_host->vports);
3376         get_device(&shost->shost_gendev);       /* for fc_host->vport list */
3377
3378         spin_unlock_irqrestore(shost->host_lock, flags);
3379
3380         dev = &vport->dev;
3381         device_initialize(dev);                 /* takes self reference */
3382         dev->parent = get_device(pdev);         /* takes parent reference */
3383         dev->release = fc_vport_dev_release;
3384         dev_set_name(dev, "vport-%d:%d-%d",
3385                      shost->host_no, channel, vport->number);
3386         transport_setup_device(dev);
3387
3388         error = device_add(dev);
3389         if (error) {
3390                 printk(KERN_ERR "FC Virtual Port device_add failed\n");
3391                 goto delete_vport;
3392         }
3393         transport_add_device(dev);
3394         transport_configure_device(dev);
3395
3396         error = fci->f->vport_create(vport, ids->disable);
3397         if (error) {
3398                 printk(KERN_ERR "FC Virtual Port LLDD Create failed\n");
3399                 goto delete_vport_all;
3400         }
3401
3402         /*
3403          * if the parent isn't the physical adapter's Scsi_Host, ensure
3404          * the Scsi_Host at least contains ia symlink to the vport.
3405          */
3406         if (pdev != &shost->shost_gendev) {
3407                 error = sysfs_create_link(&shost->shost_gendev.kobj,
3408                                  &dev->kobj, dev_name(dev));
3409                 if (error)
3410                         printk(KERN_ERR
3411                                 "%s: Cannot create vport symlinks for "
3412                                 "%s, err=%d\n",
3413                                 __func__, dev_name(dev), error);
3414         }
3415         spin_lock_irqsave(shost->host_lock, flags);
3416         vport->flags &= ~FC_VPORT_CREATING;
3417         spin_unlock_irqrestore(shost->host_lock, flags);
3418
3419         dev_printk(KERN_NOTICE, pdev,
3420                         "%s created via shost%d channel %d\n", dev_name(dev),
3421                         shost->host_no, channel);
3422
3423         *ret_vport = vport;
3424
3425         return 0;
3426
3427 delete_vport_all:
3428         transport_remove_device(dev);
3429         device_del(dev);
3430 delete_vport:
3431         transport_destroy_device(dev);
3432         spin_lock_irqsave(shost->host_lock, flags);
3433         list_del(&vport->peers);
3434         put_device(&shost->shost_gendev);       /* for fc_host->vport list */
3435         fc_host->npiv_vports_inuse--;
3436         spin_unlock_irqrestore(shost->host_lock, flags);
3437         put_device(dev->parent);
3438         kfree(vport);
3439
3440         return error;
3441 }
3442
3443 /**
3444  * fc_vport_create - Admin App or LLDD requests creation of a vport
3445  * @shost:      scsi host the virtual port is connected to.
3446  * @channel:    channel on shost port connected to.
3447  * @ids:        The world wide names, FC4 port roles, etc for
3448  *              the virtual port.
3449  *
3450  * Notes:
3451  *      This routine assumes no locks are held on entry.
3452  */
3453 struct fc_vport *
3454 fc_vport_create(struct Scsi_Host *shost, int channel,
3455         struct fc_vport_identifiers *ids)
3456 {
3457         int stat;
3458         struct fc_vport *vport;
3459
3460         stat = fc_vport_setup(shost, channel, &shost->shost_gendev,
3461                  ids, &vport);
3462         return stat ? NULL : vport;
3463 }
3464 EXPORT_SYMBOL(fc_vport_create);
3465
3466 /**
3467  * fc_vport_terminate - Admin App or LLDD requests termination of a vport
3468  * @vport:      fc_vport to be terminated
3469  *
3470  * Calls the LLDD vport_delete() function, then deallocates and removes
3471  * the vport from the shost and object tree.
3472  *
3473  * Notes:
3474  *      This routine assumes no locks are held on entry.
3475  */
3476 int
3477 fc_vport_terminate(struct fc_vport *vport)
3478 {
3479         struct Scsi_Host *shost = vport_to_shost(vport);
3480         struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
3481         struct fc_internal *i = to_fc_internal(shost->transportt);
3482         struct device *dev = &vport->dev;
3483         unsigned long flags;
3484         int stat;
3485
3486         if (i->f->vport_delete)
3487                 stat = i->f->vport_delete(vport);
3488         else
3489                 stat = -ENOENT;
3490
3491         spin_lock_irqsave(shost->host_lock, flags);
3492         vport->flags &= ~FC_VPORT_DELETING;
3493         if (!stat) {
3494                 vport->flags |= FC_VPORT_DELETED;
3495                 list_del(&vport->peers);
3496                 fc_host->npiv_vports_inuse--;
3497                 put_device(&shost->shost_gendev);  /* for fc_host->vport list */
3498         }
3499         spin_unlock_irqrestore(shost->host_lock, flags);
3500
3501         if (stat)
3502                 return stat;
3503
3504         if (dev->parent != &shost->shost_gendev)
3505                 sysfs_remove_link(&shost->shost_gendev.kobj, dev_name(dev));
3506         transport_remove_device(dev);
3507         device_del(dev);
3508         transport_destroy_device(dev);
3509
3510         /*
3511          * Removing our self-reference should mean our
3512          * release function gets called, which will drop the remaining
3513          * parent reference and free the data structure.
3514          */
3515         put_device(dev);                        /* for self-reference */
3516
3517         return 0; /* SUCCESS */
3518 }
3519 EXPORT_SYMBOL(fc_vport_terminate);
3520
3521 /**
3522  * fc_vport_sched_delete - workq-based delete request for a vport
3523  * @work:       vport to be deleted.
3524  */
3525 static void
3526 fc_vport_sched_delete(struct work_struct *work)
3527 {
3528         struct fc_vport *vport =
3529                 container_of(work, struct fc_vport, vport_delete_work);
3530         int stat;
3531
3532         stat = fc_vport_terminate(vport);
3533         if (stat)
3534                 dev_printk(KERN_ERR, vport->dev.parent,
3535                         "%s: %s could not be deleted created via "
3536                         "shost%d channel %d - error %d\n", __func__,
3537                         dev_name(&vport->dev), vport->shost->host_no,
3538                         vport->channel, stat);
3539 }
3540
3541
3542 /*
3543  * BSG support
3544  */
3545
3546
3547 /**
3548  * fc_destroy_bsgjob - routine to teardown/delete a fc bsg job
3549  * @job:        fc_bsg_job that is to be torn down
3550  */
3551 static void
3552 fc_destroy_bsgjob(struct fc_bsg_job *job)
3553 {
3554         unsigned long flags;
3555
3556         spin_lock_irqsave(&job->job_lock, flags);
3557         if (job->ref_cnt) {
3558                 spin_unlock_irqrestore(&job->job_lock, flags);
3559                 return;
3560         }
3561         spin_unlock_irqrestore(&job->job_lock, flags);
3562
3563         put_device(job->dev);   /* release reference for the request */
3564
3565         kfree(job->request_payload.sg_list);
3566         kfree(job->reply_payload.sg_list);
3567         kfree(job);
3568 }
3569
3570 /**
3571  * fc_bsg_jobdone - completion routine for bsg requests that the LLD has
3572  *                  completed
3573  * @job:        fc_bsg_job that is complete
3574  */
3575 static void
3576 fc_bsg_jobdone(struct fc_bsg_job *job)
3577 {
3578         struct request *req = job->req;
3579         struct request *rsp = req->next_rq;
3580         int err;
3581
3582         err = job->req->errors = job->reply->result;
3583
3584         if (err < 0)
3585                 /* we're only returning the result field in the reply */
3586                 job->req->sense_len = sizeof(uint32_t);
3587         else
3588                 job->req->sense_len = job->reply_len;
3589
3590         /* we assume all request payload was transferred, residual == 0 */
3591         req->resid_len = 0;
3592
3593         if (rsp) {
3594                 WARN_ON(job->reply->reply_payload_rcv_len > rsp->resid_len);
3595
3596                 /* set reply (bidi) residual */
3597                 rsp->resid_len -= min(job->reply->reply_payload_rcv_len,
3598                                       rsp->resid_len);
3599         }
3600         blk_complete_request(req);
3601 }
3602
3603 /**
3604  * fc_bsg_softirq_done - softirq done routine for destroying the bsg requests
3605  * @rq:        BSG request that holds the job to be destroyed
3606  */
3607 static void fc_bsg_softirq_done(struct request *rq)
3608 {
3609         struct fc_bsg_job *job = rq->special;
3610         unsigned long flags;
3611
3612         spin_lock_irqsave(&job->job_lock, flags);
3613         job->state_flags |= FC_RQST_STATE_DONE;
3614         job->ref_cnt--;
3615         spin_unlock_irqrestore(&job->job_lock, flags);
3616
3617         blk_end_request_all(rq, rq->errors);
3618         fc_destroy_bsgjob(job);
3619 }
3620
3621 /**
3622  * fc_bsg_job_timeout - handler for when a bsg request timesout
3623  * @req:        request that timed out
3624  */
3625 static enum blk_eh_timer_return
3626 fc_bsg_job_timeout(struct request *req)
3627 {
3628         struct fc_bsg_job *job = (void *) req->special;
3629         struct Scsi_Host *shost = job->shost;
3630         struct fc_internal *i = to_fc_internal(shost->transportt);
3631         unsigned long flags;
3632         int err = 0, done = 0;
3633
3634         if (job->rport && job->rport->port_state == FC_PORTSTATE_BLOCKED)
3635                 return BLK_EH_RESET_TIMER;
3636
3637         spin_lock_irqsave(&job->job_lock, flags);
3638         if (job->state_flags & FC_RQST_STATE_DONE)
3639                 done = 1;
3640         else
3641                 job->ref_cnt++;
3642         spin_unlock_irqrestore(&job->job_lock, flags);
3643
3644         if (!done && i->f->bsg_timeout) {
3645                 /* call LLDD to abort the i/o as it has timed out */
3646                 err = i->f->bsg_timeout(job);
3647                 if (err == -EAGAIN) {
3648                         job->ref_cnt--;
3649                         return BLK_EH_RESET_TIMER;
3650                 } else if (err)
3651                         printk(KERN_ERR "ERROR: FC BSG request timeout - LLD "
3652                                 "abort failed with status %d\n", err);
3653         }
3654
3655         /* the blk_end_sync_io() doesn't check the error */
3656         if (done)
3657                 return BLK_EH_NOT_HANDLED;
3658         else
3659                 return BLK_EH_HANDLED;
3660 }
3661
3662 static int
3663 fc_bsg_map_buffer(struct fc_bsg_buffer *buf, struct request *req)
3664 {
3665         size_t sz = (sizeof(struct scatterlist) * req->nr_phys_segments);
3666
3667         BUG_ON(!req->nr_phys_segments);
3668
3669         buf->sg_list = kzalloc(sz, GFP_KERNEL);
3670         if (!buf->sg_list)
3671                 return -ENOMEM;
3672         sg_init_table(buf->sg_list, req->nr_phys_segments);
3673         buf->sg_cnt = blk_rq_map_sg(req->q, req, buf->sg_list);
3674         buf->payload_len = blk_rq_bytes(req);
3675         return 0;
3676 }
3677
3678
3679 /**
3680  * fc_req_to_bsgjob - Allocate/create the fc_bsg_job structure for the
3681  *                   bsg request
3682  * @shost:      SCSI Host corresponding to the bsg object
3683  * @rport:      (optional) FC Remote Port corresponding to the bsg object
3684  * @req:        BSG request that needs a job structure
3685  */
3686 static int
3687 fc_req_to_bsgjob(struct Scsi_Host *shost, struct fc_rport *rport,
3688         struct request *req)
3689 {
3690         struct fc_internal *i = to_fc_internal(shost->transportt);
3691         struct request *rsp = req->next_rq;
3692         struct fc_bsg_job *job;
3693         int ret;
3694
3695         BUG_ON(req->special);
3696
3697         job = kzalloc(sizeof(struct fc_bsg_job) + i->f->dd_bsg_size,
3698                         GFP_KERNEL);
3699         if (!job)
3700                 return -ENOMEM;
3701
3702         /*
3703          * Note: this is a bit silly.
3704          * The request gets formatted as a SGIO v4 ioctl request, which
3705          * then gets reformatted as a blk request, which then gets
3706          * reformatted as a fc bsg request. And on completion, we have
3707          * to wrap return results such that SGIO v4 thinks it was a scsi
3708          * status.  I hope this was all worth it.
3709          */
3710
3711         req->special = job;
3712         job->shost = shost;
3713         job->rport = rport;
3714         job->req = req;
3715         if (i->f->dd_bsg_size)
3716                 job->dd_data = (void *)&job[1];
3717         spin_lock_init(&job->job_lock);
3718         job->request = (struct fc_bsg_request *)req->cmd;
3719         job->request_len = req->cmd_len;
3720         job->reply = req->sense;
3721         job->reply_len = SCSI_SENSE_BUFFERSIZE; /* Size of sense buffer
3722                                                  * allocated */
3723         if (req->bio) {
3724                 ret = fc_bsg_map_buffer(&job->request_payload, req);
3725                 if (ret)
3726                         goto failjob_rls_job;
3727         }
3728         if (rsp && rsp->bio) {
3729                 ret = fc_bsg_map_buffer(&job->reply_payload, rsp);
3730                 if (ret)
3731                         goto failjob_rls_rqst_payload;
3732         }
3733         job->job_done = fc_bsg_jobdone;
3734         if (rport)
3735                 job->dev = &rport->dev;
3736         else
3737                 job->dev = &shost->shost_gendev;
3738         get_device(job->dev);           /* take a reference for the request */
3739
3740         job->ref_cnt = 1;
3741
3742         return 0;
3743
3744
3745 failjob_rls_rqst_payload:
3746         kfree(job->request_payload.sg_list);
3747 failjob_rls_job:
3748         kfree(job);
3749         return -ENOMEM;
3750 }
3751
3752
3753 enum fc_dispatch_result {
3754         FC_DISPATCH_BREAK,      /* on return, q is locked, break from q loop */
3755         FC_DISPATCH_LOCKED,     /* on return, q is locked, continue on */
3756         FC_DISPATCH_UNLOCKED,   /* on return, q is unlocked, continue on */
3757 };
3758
3759
3760 /**
3761  * fc_bsg_host_dispatch - process fc host bsg requests and dispatch to LLDD
3762  * @q:          fc host request queue
3763  * @shost:      scsi host rport attached to
3764  * @job:        bsg job to be processed
3765  */
3766 static enum fc_dispatch_result
3767 fc_bsg_host_dispatch(struct request_queue *q, struct Scsi_Host *shost,
3768                          struct fc_bsg_job *job)
3769 {
3770         struct fc_internal *i = to_fc_internal(shost->transportt);
3771         int cmdlen = sizeof(uint32_t);  /* start with length of msgcode */
3772         int ret;
3773
3774         /* Validate the host command */
3775         switch (job->request->msgcode) {
3776         case FC_BSG_HST_ADD_RPORT:
3777                 cmdlen += sizeof(struct fc_bsg_host_add_rport);
3778                 break;
3779
3780         case FC_BSG_HST_DEL_RPORT:
3781                 cmdlen += sizeof(struct fc_bsg_host_del_rport);
3782                 break;
3783
3784         case FC_BSG_HST_ELS_NOLOGIN:
3785                 cmdlen += sizeof(struct fc_bsg_host_els);
3786                 /* there better be a xmt and rcv payloads */
3787                 if ((!job->request_payload.payload_len) ||
3788                     (!job->reply_payload.payload_len)) {
3789                         ret = -EINVAL;
3790                         goto fail_host_msg;
3791                 }
3792                 break;
3793
3794         case FC_BSG_HST_CT:
3795                 cmdlen += sizeof(struct fc_bsg_host_ct);
3796                 /* there better be xmt and rcv payloads */
3797                 if ((!job->request_payload.payload_len) ||
3798                     (!job->reply_payload.payload_len)) {
3799                         ret = -EINVAL;
3800                         goto fail_host_msg;
3801                 }
3802                 break;
3803
3804         case FC_BSG_HST_VENDOR:
3805                 cmdlen += sizeof(struct fc_bsg_host_vendor);
3806                 if ((shost->hostt->vendor_id == 0L) ||
3807                     (job->request->rqst_data.h_vendor.vendor_id !=
3808                         shost->hostt->vendor_id)) {
3809                         ret = -ESRCH;
3810                         goto fail_host_msg;
3811                 }
3812                 break;
3813
3814         default:
3815                 ret = -EBADR;
3816                 goto fail_host_msg;
3817         }
3818
3819         /* check if we really have all the request data needed */
3820         if (job->request_len < cmdlen) {
3821                 ret = -ENOMSG;
3822                 goto fail_host_msg;
3823         }
3824
3825         ret = i->f->bsg_request(job);
3826         if (!ret)
3827                 return FC_DISPATCH_UNLOCKED;
3828
3829 fail_host_msg:
3830         /* return the errno failure code as the only status */
3831         BUG_ON(job->reply_len < sizeof(uint32_t));
3832         job->reply->reply_payload_rcv_len = 0;
3833         job->reply->result = ret;
3834         job->reply_len = sizeof(uint32_t);
3835         fc_bsg_jobdone(job);
3836         return FC_DISPATCH_UNLOCKED;
3837 }
3838
3839
3840 /*
3841  * fc_bsg_goose_queue - restart rport queue in case it was stopped
3842  * @rport:      rport to be restarted
3843  */
3844 static void
3845 fc_bsg_goose_queue(struct fc_rport *rport)
3846 {
3847         if (!rport->rqst_q)
3848                 return;
3849
3850         /*
3851          * This get/put dance makes no sense
3852          */
3853         get_device(&rport->dev);
3854         blk_run_queue_async(rport->rqst_q);
3855         put_device(&rport->dev);
3856 }
3857
3858 /**
3859  * fc_bsg_rport_dispatch - process rport bsg requests and dispatch to LLDD
3860  * @q:          rport request queue
3861  * @shost:      scsi host rport attached to
3862  * @rport:      rport request destined to
3863  * @job:        bsg job to be processed
3864  */
3865 static enum fc_dispatch_result
3866 fc_bsg_rport_dispatch(struct request_queue *q, struct Scsi_Host *shost,
3867                          struct fc_rport *rport, struct fc_bsg_job *job)
3868 {
3869         struct fc_internal *i = to_fc_internal(shost->transportt);
3870         int cmdlen = sizeof(uint32_t);  /* start with length of msgcode */
3871         int ret;
3872
3873         /* Validate the rport command */
3874         switch (job->request->msgcode) {
3875         case FC_BSG_RPT_ELS:
3876                 cmdlen += sizeof(struct fc_bsg_rport_els);
3877                 goto check_bidi;
3878
3879         case FC_BSG_RPT_CT:
3880                 cmdlen += sizeof(struct fc_bsg_rport_ct);
3881 check_bidi:
3882                 /* there better be xmt and rcv payloads */
3883                 if ((!job->request_payload.payload_len) ||
3884                     (!job->reply_payload.payload_len)) {
3885                         ret = -EINVAL;
3886                         goto fail_rport_msg;
3887                 }
3888                 break;
3889         default:
3890                 ret = -EBADR;
3891                 goto fail_rport_msg;
3892         }
3893
3894         /* check if we really have all the request data needed */
3895         if (job->request_len < cmdlen) {
3896                 ret = -ENOMSG;
3897                 goto fail_rport_msg;
3898         }
3899
3900         ret = i->f->bsg_request(job);
3901         if (!ret)
3902                 return FC_DISPATCH_UNLOCKED;
3903
3904 fail_rport_msg:
3905         /* return the errno failure code as the only status */
3906         BUG_ON(job->reply_len < sizeof(uint32_t));
3907         job->reply->reply_payload_rcv_len = 0;
3908         job->reply->result = ret;
3909         job->reply_len = sizeof(uint32_t);
3910         fc_bsg_jobdone(job);
3911         return FC_DISPATCH_UNLOCKED;
3912 }
3913
3914
3915 /**
3916  * fc_bsg_request_handler - generic handler for bsg requests
3917  * @q:          request queue to manage
3918  * @shost:      Scsi_Host related to the bsg object
3919  * @rport:      FC remote port related to the bsg object (optional)
3920  * @dev:        device structure for bsg object
3921  */
3922 static void
3923 fc_bsg_request_handler(struct request_queue *q, struct Scsi_Host *shost,
3924                        struct fc_rport *rport, struct device *dev)
3925 {
3926         struct request *req;
3927         struct fc_bsg_job *job;
3928         enum fc_dispatch_result ret;
3929
3930         if (!get_device(dev))
3931                 return;
3932
3933         while (1) {
3934                 if (rport && (rport->port_state == FC_PORTSTATE_BLOCKED) &&
3935                     !(rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT))
3936                         break;
3937
3938                 req = blk_fetch_request(q);
3939                 if (!req)
3940                         break;
3941
3942                 if (rport && (rport->port_state != FC_PORTSTATE_ONLINE)) {
3943                         req->errors = -ENXIO;
3944                         spin_unlock_irq(q->queue_lock);
3945                         blk_end_request_all(req, -ENXIO);
3946                         spin_lock_irq(q->queue_lock);
3947                         continue;
3948                 }
3949
3950                 spin_unlock_irq(q->queue_lock);
3951
3952                 ret = fc_req_to_bsgjob(shost, rport, req);
3953                 if (ret) {
3954                         req->errors = ret;
3955                         blk_end_request_all(req, ret);
3956                         spin_lock_irq(q->queue_lock);
3957                         continue;
3958                 }
3959
3960                 job = req->special;
3961
3962                 /* check if we have the msgcode value at least */
3963                 if (job->request_len < sizeof(uint32_t)) {
3964                         BUG_ON(job->reply_len < sizeof(uint32_t));
3965                         job->reply->reply_payload_rcv_len = 0;
3966                         job->reply->result = -ENOMSG;
3967                         job->reply_len = sizeof(uint32_t);
3968                         fc_bsg_jobdone(job);
3969                         spin_lock_irq(q->queue_lock);
3970                         continue;
3971                 }
3972
3973                 /* the dispatch routines will unlock the queue_lock */
3974                 if (rport)
3975                         ret = fc_bsg_rport_dispatch(q, shost, rport, job);
3976                 else
3977                         ret = fc_bsg_host_dispatch(q, shost, job);
3978
3979                 /* did dispatcher hit state that can't process any more */
3980                 if (ret == FC_DISPATCH_BREAK)
3981                         break;
3982
3983                 /* did dispatcher had released the lock */
3984                 if (ret == FC_DISPATCH_UNLOCKED)
3985                         spin_lock_irq(q->queue_lock);
3986         }
3987
3988         spin_unlock_irq(q->queue_lock);
3989         put_device(dev);
3990         spin_lock_irq(q->queue_lock);
3991 }
3992
3993
3994 /**
3995  * fc_bsg_host_handler - handler for bsg requests for a fc host
3996  * @q:          fc host request queue
3997  */
3998 static void
3999 fc_bsg_host_handler(struct request_queue *q)
4000 {
4001         struct Scsi_Host *shost = q->queuedata;
4002
4003         fc_bsg_request_handler(q, shost, NULL, &shost->shost_gendev);
4004 }
4005
4006
4007 /**
4008  * fc_bsg_rport_handler - handler for bsg requests for a fc rport
4009  * @q:          rport request queue
4010  */
4011 static void
4012 fc_bsg_rport_handler(struct request_queue *q)
4013 {
4014         struct fc_rport *rport = q->queuedata;
4015         struct Scsi_Host *shost = rport_to_shost(rport);
4016
4017         fc_bsg_request_handler(q, shost, rport, &rport->dev);
4018 }
4019
4020
4021 /**
4022  * fc_bsg_hostadd - Create and add the bsg hooks so we can receive requests
4023  * @shost:      shost for fc_host
4024  * @fc_host:    fc_host adding the structures to
4025  */
4026 static int
4027 fc_bsg_hostadd(struct Scsi_Host *shost, struct fc_host_attrs *fc_host)
4028 {
4029         struct device *dev = &shost->shost_gendev;
4030         struct fc_internal *i = to_fc_internal(shost->transportt);
4031         struct request_queue *q;
4032         int err;
4033         char bsg_name[20];
4034
4035         fc_host->rqst_q = NULL;
4036
4037         if (!i->f->bsg_request)
4038                 return -ENOTSUPP;
4039
4040         snprintf(bsg_name, sizeof(bsg_name),
4041                  "fc_host%d", shost->host_no);
4042
4043         q = __scsi_alloc_queue(shost, fc_bsg_host_handler);
4044         if (!q) {
4045                 printk(KERN_ERR "fc_host%d: bsg interface failed to "
4046                                 "initialize - no request queue\n",
4047                                  shost->host_no);
4048                 return -ENOMEM;
4049         }
4050
4051         q->queuedata = shost;
4052         queue_flag_set_unlocked(QUEUE_FLAG_BIDI, q);
4053         blk_queue_softirq_done(q, fc_bsg_softirq_done);
4054         blk_queue_rq_timed_out(q, fc_bsg_job_timeout);
4055         blk_queue_rq_timeout(q, FC_DEFAULT_BSG_TIMEOUT);
4056
4057         err = bsg_register_queue(q, dev, bsg_name, NULL);
4058         if (err) {
4059                 printk(KERN_ERR "fc_host%d: bsg interface failed to "
4060                                 "initialize - register queue\n",
4061                                 shost->host_no);
4062                 blk_cleanup_queue(q);
4063                 return err;
4064         }
4065
4066         fc_host->rqst_q = q;
4067         return 0;
4068 }
4069
4070
4071 /**
4072  * fc_bsg_rportadd - Create and add the bsg hooks so we can receive requests
4073  * @shost:      shost that rport is attached to
4074  * @rport:      rport that the bsg hooks are being attached to
4075  */
4076 static int
4077 fc_bsg_rportadd(struct Scsi_Host *shost, struct fc_rport *rport)
4078 {
4079         struct device *dev = &rport->dev;
4080         struct fc_internal *i = to_fc_internal(shost->transportt);
4081         struct request_queue *q;
4082         int err;
4083
4084         rport->rqst_q = NULL;
4085
4086         if (!i->f->bsg_request)
4087                 return -ENOTSUPP;
4088
4089         q = __scsi_alloc_queue(shost, fc_bsg_rport_handler);
4090         if (!q) {
4091                 printk(KERN_ERR "%s: bsg interface failed to "
4092                                 "initialize - no request queue\n",
4093                                  dev->kobj.name);
4094                 return -ENOMEM;
4095         }
4096
4097         q->queuedata = rport;
4098         queue_flag_set_unlocked(QUEUE_FLAG_BIDI, q);
4099         blk_queue_softirq_done(q, fc_bsg_softirq_done);
4100         blk_queue_rq_timed_out(q, fc_bsg_job_timeout);
4101         blk_queue_rq_timeout(q, BLK_DEFAULT_SG_TIMEOUT);
4102
4103         err = bsg_register_queue(q, dev, NULL, NULL);
4104         if (err) {
4105                 printk(KERN_ERR "%s: bsg interface failed to "
4106                                 "initialize - register queue\n",
4107                                  dev->kobj.name);
4108                 blk_cleanup_queue(q);
4109                 return err;
4110         }
4111
4112         rport->rqst_q = q;
4113         return 0;
4114 }
4115
4116
4117 /**
4118  * fc_bsg_remove - Deletes the bsg hooks on fchosts/rports
4119  * @q:  the request_queue that is to be torn down.
4120  *
4121  * Notes:
4122  *   Before unregistering the queue empty any requests that are blocked
4123  *
4124  *
4125  */
4126 static void
4127 fc_bsg_remove(struct request_queue *q)
4128 {
4129         struct request *req; /* block request */
4130         int counts; /* totals for request_list count and starved */
4131
4132         if (q) {
4133                 /* Stop taking in new requests */
4134                 spin_lock_irq(q->queue_lock);
4135                 blk_stop_queue(q);
4136
4137                 /* drain all requests in the queue */
4138                 while (1) {
4139                         /* need the lock to fetch a request
4140                          * this may fetch the same reqeust as the previous pass
4141                          */
4142                         req = blk_fetch_request(q);
4143                         /* save requests in use and starved */
4144                         counts = q->rq.count[0] + q->rq.count[1] +
4145                                 q->rq.starved[0] + q->rq.starved[1];
4146                         spin_unlock_irq(q->queue_lock);
4147                         /* any requests still outstanding? */
4148                         if (counts == 0)
4149                                 break;
4150
4151                         /* This may be the same req as the previous iteration,
4152                          * always send the blk_end_request_all after a prefetch.
4153                          * It is not okay to not end the request because the
4154                          * prefetch started the request.
4155                          */
4156                         if (req) {
4157                                 /* return -ENXIO to indicate that this queue is
4158                                  * going away
4159                                  */
4160                                 req->errors = -ENXIO;
4161                                 blk_end_request_all(req, -ENXIO);
4162                         }
4163
4164                         msleep(200); /* allow bsg to possibly finish */
4165                         spin_lock_irq(q->queue_lock);
4166                 }
4167
4168                 bsg_unregister_queue(q);
4169                 blk_cleanup_queue(q);
4170         }
4171 }
4172
4173
4174 /* Original Author:  Martin Hicks */
4175 MODULE_AUTHOR("James Smart");
4176 MODULE_DESCRIPTION("FC Transport Attributes");
4177 MODULE_LICENSE("GPL");
4178
4179 module_init(fc_transport_init);
4180 module_exit(fc_transport_exit);