SAFE public projects git trees. - safe/jmp/linux-2.6/blob - drivers/scsi/scsi_transport_iscsi.c

   1 /*
   2  * iSCSI transport class definitions
   3  *
   4  * Copyright (C) IBM Corporation, 2004
   5  * Copyright (C) Mike Christie, 2004 - 2005
   6  * Copyright (C) Dmitry Yusupov, 2004 - 2005
   7  * Copyright (C) Alex Aizman, 2004 - 2005
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  22  */
  23 #include <linux/module.h>
  24 #include <linux/mutex.h>
  25 #include <net/tcp.h>
  26 #include <scsi/scsi.h>
  27 #include <scsi/scsi_host.h>
  28 #include <scsi/scsi_device.h>
  29 #include <scsi/scsi_transport.h>
  30 #include <scsi/scsi_transport_iscsi.h>
  31 #include <scsi/iscsi_if.h>
  32
  33 #define ISCSI_SESSION_ATTRS 19
  34 #define ISCSI_CONN_ATTRS 13
  35 #define ISCSI_HOST_ATTRS 4
  36 #define ISCSI_TRANSPORT_VERSION "2.0-869"
  37
  38 struct iscsi_internal {
  39         int daemon_pid;
  40         struct scsi_transport_template t;
  41         struct iscsi_transport *iscsi_transport;
  42         struct list_head list;
  43         struct class_device cdev;
  44
  45         struct class_device_attribute *host_attrs[ISCSI_HOST_ATTRS + 1];
  46         struct transport_container conn_cont;
  47         struct class_device_attribute *conn_attrs[ISCSI_CONN_ATTRS + 1];
  48         struct transport_container session_cont;
  49         struct class_device_attribute *session_attrs[ISCSI_SESSION_ATTRS + 1];
  50 };
  51
  52 static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
  53 static struct workqueue_struct *iscsi_eh_timer_workq;
  54
  55 /*
  56  * list of registered transports and lock that must
  57  * be held while accessing list. The iscsi_transport_lock must
  58  * be acquired after the rx_queue_mutex.
  59  */
  60 static LIST_HEAD(iscsi_transports);
  61 static DEFINE_SPINLOCK(iscsi_transport_lock);
  62
  63 #define to_iscsi_internal(tmpl) \
  64         container_of(tmpl, struct iscsi_internal, t)
  65
  66 #define cdev_to_iscsi_internal(_cdev) \
  67         container_of(_cdev, struct iscsi_internal, cdev)
  68
  69 static void iscsi_transport_release(struct class_device *cdev)
  70 {
  71         struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev);
  72         kfree(priv);
  73 }
  74
  75 /*
  76  * iscsi_transport_class represents the iscsi_transports that are
  77  * registered.
  78  */
  79 static struct class iscsi_transport_class = {
  80         .name = "iscsi_transport",
  81         .release = iscsi_transport_release,
  82 };
  83
  84 static ssize_t
  85 show_transport_handle(struct class_device *cdev, char *buf)
  86 {
  87         struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev);
  88         return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport));
  89 }
  90 static CLASS_DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
  91
  92 #define show_transport_attr(name, format)                               \
  93 static ssize_t                                                          \
  94 show_transport_##name(struct class_device *cdev, char *buf)             \
  95 {                                                                       \
  96         struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev);     \
  97         return sprintf(buf, format"\n", priv->iscsi_transport->name);   \
  98 }                                                                       \
  99 static CLASS_DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
 100
 101 show_transport_attr(caps, "0x%x");
 102 show_transport_attr(max_lun, "%d");
 103 show_transport_attr(max_conn, "%d");
 104 show_transport_attr(max_cmd_len, "%d");
 105
 106 static struct attribute *iscsi_transport_attrs[] = {
 107         &class_device_attr_handle.attr,
 108         &class_device_attr_caps.attr,
 109         &class_device_attr_max_lun.attr,
 110         &class_device_attr_max_conn.attr,
 111         &class_device_attr_max_cmd_len.attr,
 112         NULL,
 113 };
 114
 115 static struct attribute_group iscsi_transport_group = {
 116         .attrs = iscsi_transport_attrs,
 117 };
 118
 119
 120
 121 static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
 122                             struct class_device *cdev)
 123 {
 124         struct Scsi_Host *shost = dev_to_shost(dev);
 125         struct iscsi_host *ihost = shost->shost_data;
 126
 127         memset(ihost, 0, sizeof(*ihost));
 128         INIT_LIST_HEAD(&ihost->sessions);
 129         mutex_init(&ihost->mutex);
 130         atomic_set(&ihost->nr_scans, 0);
 131
 132         snprintf(ihost->scan_workq_name, KOBJ_NAME_LEN, "iscsi_scan_%d",
 133                 shost->host_no);
 134         ihost->scan_workq = create_singlethread_workqueue(
 135                                                 ihost->scan_workq_name);
 136         if (!ihost->scan_workq)
 137                 return -ENOMEM;
 138         return 0;
 139 }
 140
 141 static int iscsi_remove_host(struct transport_container *tc, struct device *dev,
 142                              struct class_device *cdev)
 143 {
 144         struct Scsi_Host *shost = dev_to_shost(dev);
 145         struct iscsi_host *ihost = shost->shost_data;
 146
 147         destroy_workqueue(ihost->scan_workq);
 148         return 0;
 149 }
 150
 151 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
 152                                "iscsi_host",
 153                                iscsi_setup_host,
 154                                iscsi_remove_host,
 155                                NULL);
 156
 157 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
 158                                "iscsi_session",
 159                                NULL,
 160                                NULL,
 161                                NULL);
 162
 163 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
 164                                "iscsi_connection",
 165                                NULL,
 166                                NULL,
 167                                NULL);
 168
 169 static struct sock *nls;
 170 static DEFINE_MUTEX(rx_queue_mutex);
 171
 172 static LIST_HEAD(sesslist);
 173 static DEFINE_SPINLOCK(sesslock);
 174 static LIST_HEAD(connlist);
 175 static DEFINE_SPINLOCK(connlock);
 176
 177 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
 178 {
 179         struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
 180         return sess->sid;
 181 }
 182
 183 /*
 184  * Returns the matching session to a given sid
 185  */
 186 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
 187 {
 188         unsigned long flags;
 189         struct iscsi_cls_session *sess;
 190
 191         spin_lock_irqsave(&sesslock, flags);
 192         list_for_each_entry(sess, &sesslist, sess_list) {
 193                 if (sess->sid == sid) {
 194                         spin_unlock_irqrestore(&sesslock, flags);
 195                         return sess;
 196                 }
 197         }
 198         spin_unlock_irqrestore(&sesslock, flags);
 199         return NULL;
 200 }
 201
 202 /*
 203  * Returns the matching connection to a given sid / cid tuple
 204  */
 205 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
 206 {
 207         unsigned long flags;
 208         struct iscsi_cls_conn *conn;
 209
 210         spin_lock_irqsave(&connlock, flags);
 211         list_for_each_entry(conn, &connlist, conn_list) {
 212                 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
 213                         spin_unlock_irqrestore(&connlock, flags);
 214                         return conn;
 215                 }
 216         }
 217         spin_unlock_irqrestore(&connlock, flags);
 218         return NULL;
 219 }
 220
 221 /*
 222  * The following functions can be used by LLDs that allocate
 223  * their own scsi_hosts or by software iscsi LLDs
 224  */
 225 static struct {
 226         int value;
 227         char *name;
 228 } iscsi_session_state_names[] = {
 229         { ISCSI_SESSION_LOGGED_IN,      "LOGGED_IN" },
 230         { ISCSI_SESSION_FAILED,         "FAILED" },
 231         { ISCSI_SESSION_FREE,           "FREE" },
 232 };
 233
 234 static const char *iscsi_session_state_name(int state)
 235 {
 236         int i;
 237         char *name = NULL;
 238
 239         for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
 240                 if (iscsi_session_state_names[i].value == state) {
 241                         name = iscsi_session_state_names[i].name;
 242                         break;
 243                 }
 244         }
 245         return name;
 246 }
 247
 248 int iscsi_session_chkready(struct iscsi_cls_session *session)
 249 {
 250         unsigned long flags;
 251         int err;
 252
 253         spin_lock_irqsave(&session->lock, flags);
 254         switch (session->state) {
 255         case ISCSI_SESSION_LOGGED_IN:
 256                 err = 0;
 257                 break;
 258         case ISCSI_SESSION_FAILED:
 259                 err = DID_IMM_RETRY << 16;
 260                 break;
 261         case ISCSI_SESSION_FREE:
 262                 err = DID_NO_CONNECT << 16;
 263                 break;
 264         default:
 265                 err = DID_NO_CONNECT << 16;
 266                 break;
 267         }
 268         spin_unlock_irqrestore(&session->lock, flags);
 269         return err;
 270 }
 271 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
 272
 273 static void iscsi_session_release(struct device *dev)
 274 {
 275         struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
 276         struct Scsi_Host *shost;
 277
 278         shost = iscsi_session_to_shost(session);
 279         scsi_host_put(shost);
 280         kfree(session);
 281 }
 282
 283 static int iscsi_is_session_dev(const struct device *dev)
 284 {
 285         return dev->release == iscsi_session_release;
 286 }
 287
 288 /**
 289  * iscsi_scan_finished - helper to report when running scans are done
 290  * @shost: scsi host
 291  * @time: scan run time
 292  *
 293  * This function can be used by drives like qla4xxx to report to the scsi
 294  * layer when the scans it kicked off at module load time are done.
 295  */
 296 int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
 297 {
 298         struct iscsi_host *ihost = shost->shost_data;
 299         /*
 300          * qla4xxx will have kicked off some session unblocks before calling
 301          * scsi_scan_host, so just wait for them to complete.
 302          */
 303         return !atomic_read(&ihost->nr_scans);
 304 }
 305 EXPORT_SYMBOL_GPL(iscsi_scan_finished);
 306
 307 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
 308                            uint id, uint lun)
 309 {
 310         struct iscsi_host *ihost = shost->shost_data;
 311         struct iscsi_cls_session *session;
 312
 313         mutex_lock(&ihost->mutex);
 314         list_for_each_entry(session, &ihost->sessions, host_list) {
 315                 if ((channel == SCAN_WILD_CARD || channel == 0) &&
 316                     (id == SCAN_WILD_CARD || id == session->target_id))
 317                         scsi_scan_target(&session->dev, 0,
 318                                          session->target_id, lun, 1);
 319         }
 320         mutex_unlock(&ihost->mutex);
 321
 322         return 0;
 323 }
 324
 325 static void iscsi_scan_session(struct work_struct *work)
 326 {
 327         struct iscsi_cls_session *session =
 328                         container_of(work, struct iscsi_cls_session, scan_work);
 329         struct Scsi_Host *shost = iscsi_session_to_shost(session);
 330         struct iscsi_host *ihost = shost->shost_data;
 331         unsigned long flags;
 332
 333         spin_lock_irqsave(&session->lock, flags);
 334         if (session->state != ISCSI_SESSION_LOGGED_IN) {
 335                 spin_unlock_irqrestore(&session->lock, flags);
 336                 goto done;
 337         }
 338         spin_unlock_irqrestore(&session->lock, flags);
 339
 340         scsi_scan_target(&session->dev, 0, session->target_id,
 341                          SCAN_WILD_CARD, 1);
 342 done:
 343         atomic_dec(&ihost->nr_scans);
 344 }
 345
 346 static void session_recovery_timedout(struct work_struct *work)
 347 {
 348         struct iscsi_cls_session *session =
 349                 container_of(work, struct iscsi_cls_session,
 350                              recovery_work.work);
 351         unsigned long flags;
 352
 353         iscsi_cls_session_printk(KERN_INFO, session,
 354                                  "session recovery timed out after %d secs\n",
 355                                  session->recovery_tmo);
 356
 357         spin_lock_irqsave(&session->lock, flags);
 358         switch (session->state) {
 359         case ISCSI_SESSION_FAILED:
 360                 session->state = ISCSI_SESSION_FREE;
 361                 break;
 362         case ISCSI_SESSION_LOGGED_IN:
 363         case ISCSI_SESSION_FREE:
 364                 /* we raced with the unblock's flush */
 365                 spin_unlock_irqrestore(&session->lock, flags);
 366                 return;
 367         }
 368         spin_unlock_irqrestore(&session->lock, flags);
 369
 370         if (session->transport->session_recovery_timedout)
 371                 session->transport->session_recovery_timedout(session);
 372
 373         scsi_target_unblock(&session->dev);
 374 }
 375
 376 static void __iscsi_unblock_session(struct work_struct *work)
 377 {
 378         struct iscsi_cls_session *session =
 379                         container_of(work, struct iscsi_cls_session,
 380                                      unblock_work);
 381         struct Scsi_Host *shost = iscsi_session_to_shost(session);
 382         struct iscsi_host *ihost = shost->shost_data;
 383         unsigned long flags;
 384
 385         /*
 386          * The recovery and unblock work get run from the same workqueue,
 387          * so try to cancel it if it was going to run after this unblock.
 388          */
 389         cancel_delayed_work(&session->recovery_work);
 390         spin_lock_irqsave(&session->lock, flags);
 391         session->state = ISCSI_SESSION_LOGGED_IN;
 392         spin_unlock_irqrestore(&session->lock, flags);
 393         /* start IO */
 394         scsi_target_unblock(&session->dev);
 395         /*
 396          * Only do kernel scanning if the driver is properly hooked into
 397          * the async scanning code (drivers like iscsi_tcp do login and
 398          * scanning from userspace).
 399          */
 400         if (shost->hostt->scan_finished) {
 401                 if (queue_work(ihost->scan_workq, &session->scan_work))
 402                         atomic_inc(&ihost->nr_scans);
 403         }
 404 }
 405
 406 /**
 407  * iscsi_unblock_session - set a session as logged in and start IO.
 408  * @session: iscsi session
 409  *
 410  * Mark a session as ready to accept IO.
 411  */
 412 void iscsi_unblock_session(struct iscsi_cls_session *session)
 413 {
 414         queue_work(iscsi_eh_timer_workq, &session->unblock_work);
 415         /*
 416          * make sure all the events have completed before tell the driver
 417          * it is safe
 418          */
 419         flush_workqueue(iscsi_eh_timer_workq);
 420 }
 421 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
 422
 423 static void __iscsi_block_session(struct work_struct *work)
 424 {
 425         struct iscsi_cls_session *session =
 426                         container_of(work, struct iscsi_cls_session,
 427                                      block_work);
 428         unsigned long flags;
 429
 430         spin_lock_irqsave(&session->lock, flags);
 431         session->state = ISCSI_SESSION_FAILED;
 432         spin_unlock_irqrestore(&session->lock, flags);
 433         scsi_target_block(&session->dev);
 434         queue_delayed_work(iscsi_eh_timer_workq, &session->recovery_work,
 435                            session->recovery_tmo * HZ);
 436 }
 437
 438 void iscsi_block_session(struct iscsi_cls_session *session)
 439 {
 440         queue_work(iscsi_eh_timer_workq, &session->block_work);
 441 }
 442 EXPORT_SYMBOL_GPL(iscsi_block_session);
 443
 444 static void __iscsi_unbind_session(struct work_struct *work)
 445 {
 446         struct iscsi_cls_session *session =
 447                         container_of(work, struct iscsi_cls_session,
 448                                      unbind_work);
 449         struct Scsi_Host *shost = iscsi_session_to_shost(session);
 450         struct iscsi_host *ihost = shost->shost_data;
 451
 452         /* Prevent new scans and make sure scanning is not in progress */
 453         mutex_lock(&ihost->mutex);
 454         if (list_empty(&session->host_list)) {
 455                 mutex_unlock(&ihost->mutex);
 456                 return;
 457         }
 458         list_del_init(&session->host_list);
 459         mutex_unlock(&ihost->mutex);
 460
 461         scsi_remove_target(&session->dev);
 462         iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
 463 }
 464
 465 static int iscsi_unbind_session(struct iscsi_cls_session *session)
 466 {
 467         struct Scsi_Host *shost = iscsi_session_to_shost(session);
 468         struct iscsi_host *ihost = shost->shost_data;
 469
 470         return queue_work(ihost->scan_workq, &session->unbind_work);
 471 }
 472
 473 struct iscsi_cls_session *
 474 iscsi_alloc_session(struct Scsi_Host *shost,
 475                     struct iscsi_transport *transport)
 476 {
 477         struct iscsi_cls_session *session;
 478
 479         session = kzalloc(sizeof(*session) + transport->sessiondata_size,
 480                           GFP_KERNEL);
 481         if (!session)
 482                 return NULL;
 483
 484         session->transport = transport;
 485         session->recovery_tmo = 120;
 486         session->state = ISCSI_SESSION_FREE;
 487         INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
 488         INIT_LIST_HEAD(&session->host_list);
 489         INIT_LIST_HEAD(&session->sess_list);
 490         INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
 491         INIT_WORK(&session->block_work, __iscsi_block_session);
 492         INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
 493         INIT_WORK(&session->scan_work, iscsi_scan_session);
 494         spin_lock_init(&session->lock);
 495
 496         /* this is released in the dev's release function */
 497         scsi_host_get(shost);
 498         session->dev.parent = &shost->shost_gendev;
 499         session->dev.release = iscsi_session_release;
 500         device_initialize(&session->dev);
 501         if (transport->sessiondata_size)
 502                 session->dd_data = &session[1];
 503         return session;
 504 }
 505 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
 506
 507 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
 508 {
 509         struct Scsi_Host *shost = iscsi_session_to_shost(session);
 510         struct iscsi_host *ihost;
 511         unsigned long flags;
 512         int err;
 513
 514         ihost = shost->shost_data;
 515         session->sid = atomic_add_return(1, &iscsi_session_nr);
 516         session->target_id = target_id;
 517
 518         snprintf(session->dev.bus_id, BUS_ID_SIZE, "session%u",
 519                  session->sid);
 520         err = device_add(&session->dev);
 521         if (err) {
 522                 iscsi_cls_session_printk(KERN_ERR, session,
 523                                          "could not register session's dev\n");
 524                 goto release_host;
 525         }
 526         transport_register_device(&session->dev);
 527
 528         spin_lock_irqsave(&sesslock, flags);
 529         list_add(&session->sess_list, &sesslist);
 530         spin_unlock_irqrestore(&sesslock, flags);
 531
 532         mutex_lock(&ihost->mutex);
 533         list_add(&session->host_list, &ihost->sessions);
 534         mutex_unlock(&ihost->mutex);
 535
 536         iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
 537         return 0;
 538
 539 release_host:
 540         scsi_host_put(shost);
 541         return err;
 542 }
 543 EXPORT_SYMBOL_GPL(iscsi_add_session);
 544
 545 /**
 546  * iscsi_create_session - create iscsi class session
 547  * @shost: scsi host
 548  * @transport: iscsi transport
 549  * @target_id: which target
 550  *
 551  * This can be called from a LLD or iscsi_transport.
 552  */
 553 struct iscsi_cls_session *
 554 iscsi_create_session(struct Scsi_Host *shost,
 555                      struct iscsi_transport *transport,
 556                      unsigned int target_id)
 557 {
 558         struct iscsi_cls_session *session;
 559
 560         session = iscsi_alloc_session(shost, transport);
 561         if (!session)
 562                 return NULL;
 563
 564         if (iscsi_add_session(session, target_id)) {
 565                 iscsi_free_session(session);
 566                 return NULL;
 567         }
 568         return session;
 569 }
 570 EXPORT_SYMBOL_GPL(iscsi_create_session);
 571
 572 static void iscsi_conn_release(struct device *dev)
 573 {
 574         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
 575         struct device *parent = conn->dev.parent;
 576
 577         kfree(conn);
 578         put_device(parent);
 579 }
 580
 581 static int iscsi_is_conn_dev(const struct device *dev)
 582 {
 583         return dev->release == iscsi_conn_release;
 584 }
 585
 586 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
 587 {
 588         if (!iscsi_is_conn_dev(dev))
 589                 return 0;
 590         return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
 591 }
 592
 593 void iscsi_remove_session(struct iscsi_cls_session *session)
 594 {
 595         struct Scsi_Host *shost = iscsi_session_to_shost(session);
 596         struct iscsi_host *ihost = shost->shost_data;
 597         unsigned long flags;
 598         int err;
 599
 600         spin_lock_irqsave(&sesslock, flags);
 601         list_del(&session->sess_list);
 602         spin_unlock_irqrestore(&sesslock, flags);
 603
 604         /* make sure there are no blocks/unblocks queued */
 605         flush_workqueue(iscsi_eh_timer_workq);
 606         /* make sure the timedout callout is not running */
 607         if (!cancel_delayed_work(&session->recovery_work))
 608                 flush_workqueue(iscsi_eh_timer_workq);
 609         /*
 610          * If we are blocked let commands flow again. The lld or iscsi
 611          * layer should set up the queuecommand to fail commands.
 612          * We assume that LLD will not be calling block/unblock while
 613          * removing the session.
 614          */
 615         spin_lock_irqsave(&session->lock, flags);
 616         session->state = ISCSI_SESSION_FREE;
 617         spin_unlock_irqrestore(&session->lock, flags);
 618
 619         scsi_target_unblock(&session->dev);
 620         /* flush running scans then delete devices */
 621         flush_workqueue(ihost->scan_workq);
 622         __iscsi_unbind_session(&session->unbind_work);
 623
 624         /* hw iscsi may not have removed all connections from session */
 625         err = device_for_each_child(&session->dev, NULL,
 626                                     iscsi_iter_destroy_conn_fn);
 627         if (err)
 628                 iscsi_cls_session_printk(KERN_ERR, session,
 629                                          "Could not delete all connections "
 630                                          "for session. Error %d.\n", err);
 631
 632         transport_unregister_device(&session->dev);
 633         device_del(&session->dev);
 634 }
 635 EXPORT_SYMBOL_GPL(iscsi_remove_session);
 636
 637 void iscsi_free_session(struct iscsi_cls_session *session)
 638 {
 639         iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
 640         put_device(&session->dev);
 641 }
 642 EXPORT_SYMBOL_GPL(iscsi_free_session);
 643
 644 /**
 645  * iscsi_destroy_session - destroy iscsi session
 646  * @session: iscsi_session
 647  *
 648  * Can be called by a LLD or iscsi_transport. There must not be
 649  * any running connections.
 650  */
 651 int iscsi_destroy_session(struct iscsi_cls_session *session)
 652 {
 653         iscsi_remove_session(session);
 654         iscsi_free_session(session);
 655         return 0;
 656 }
 657 EXPORT_SYMBOL_GPL(iscsi_destroy_session);
 658
 659 /**
 660  * iscsi_create_conn - create iscsi class connection
 661  * @session: iscsi cls session
 662  * @cid: connection id
 663  *
 664  * This can be called from a LLD or iscsi_transport. The connection
 665  * is child of the session so cid must be unique for all connections
 666  * on the session.
 667  *
 668  * Since we do not support MCS, cid will normally be zero. In some cases
 669  * for software iscsi we could be trying to preallocate a connection struct
 670  * in which case there could be two connection structs and cid would be
 671  * non-zero.
 672  */
 673 struct iscsi_cls_conn *
 674 iscsi_create_conn(struct iscsi_cls_session *session, uint32_t cid)
 675 {
 676         struct iscsi_transport *transport = session->transport;
 677         struct iscsi_cls_conn *conn;
 678         unsigned long flags;
 679         int err;
 680
 681         conn = kzalloc(sizeof(*conn) + transport->conndata_size, GFP_KERNEL);
 682         if (!conn)
 683                 return NULL;
 684
 685         if (transport->conndata_size)
 686                 conn->dd_data = &conn[1];
 687
 688         INIT_LIST_HEAD(&conn->conn_list);
 689         conn->transport = transport;
 690         conn->cid = cid;
 691
 692         /* this is released in the dev's release function */
 693         if (!get_device(&session->dev))
 694                 goto free_conn;
 695
 696         snprintf(conn->dev.bus_id, BUS_ID_SIZE, "connection%d:%u",
 697                  session->sid, cid);
 698         conn->dev.parent = &session->dev;
 699         conn->dev.release = iscsi_conn_release;
 700         err = device_register(&conn->dev);
 701         if (err) {
 702                 iscsi_cls_session_printk(KERN_ERR, session, "could not "
 703                                          "register connection's dev\n");
 704                 goto release_parent_ref;
 705         }
 706         transport_register_device(&conn->dev);
 707
 708         spin_lock_irqsave(&connlock, flags);
 709         list_add(&conn->conn_list, &connlist);
 710         conn->active = 1;
 711         spin_unlock_irqrestore(&connlock, flags);
 712         return conn;
 713
 714 release_parent_ref:
 715         put_device(&session->dev);
 716 free_conn:
 717         kfree(conn);
 718         return NULL;
 719 }
 720
 721 EXPORT_SYMBOL_GPL(iscsi_create_conn);
 722
 723 /**
 724  * iscsi_destroy_conn - destroy iscsi class connection
 725  * @conn: iscsi cls session
 726  *
 727  * This can be called from a LLD or iscsi_transport.
 728  */
 729 int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
 730 {
 731         unsigned long flags;
 732
 733         spin_lock_irqsave(&connlock, flags);
 734         conn->active = 0;
 735         list_del(&conn->conn_list);
 736         spin_unlock_irqrestore(&connlock, flags);
 737
 738         transport_unregister_device(&conn->dev);
 739         device_unregister(&conn->dev);
 740         return 0;
 741 }
 742 EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
 743
 744 /*
 745  * iscsi interface functions
 746  */
 747 static struct iscsi_internal *
 748 iscsi_if_transport_lookup(struct iscsi_transport *tt)
 749 {
 750         struct iscsi_internal *priv;
 751         unsigned long flags;
 752
 753         spin_lock_irqsave(&iscsi_transport_lock, flags);
 754         list_for_each_entry(priv, &iscsi_transports, list) {
 755                 if (tt == priv->iscsi_transport) {
 756                         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
 757                         return priv;
 758                 }
 759         }
 760         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
 761         return NULL;
 762 }
 763
 764 static int
 765 iscsi_broadcast_skb(struct sk_buff *skb, gfp_t gfp)
 766 {
 767         int rc;
 768
 769         rc = netlink_broadcast(nls, skb, 0, 1, gfp);
 770         if (rc < 0) {
 771                 printk(KERN_ERR "iscsi: can not broadcast skb (%d)\n", rc);
 772                 return rc;
 773         }
 774
 775         return 0;
 776 }
 777
 778 static int
 779 iscsi_unicast_skb(struct sk_buff *skb, int pid)
 780 {
 781         int rc;
 782
 783         rc = netlink_unicast(nls, skb, pid, MSG_DONTWAIT);
 784         if (rc < 0) {
 785                 printk(KERN_ERR "iscsi: can not unicast skb (%d)\n", rc);
 786                 return rc;
 787         }
 788
 789         return 0;
 790 }
 791
 792 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
 793                    char *data, uint32_t data_size)
 794 {
 795         struct nlmsghdr *nlh;
 796         struct sk_buff *skb;
 797         struct iscsi_uevent *ev;
 798         char *pdu;
 799         struct iscsi_internal *priv;
 800         int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) +
 801                               data_size);
 802
 803         priv = iscsi_if_transport_lookup(conn->transport);
 804         if (!priv)
 805                 return -EINVAL;
 806
 807         skb = alloc_skb(len, GFP_ATOMIC);
 808         if (!skb) {
 809                 iscsi_conn_error(conn, ISCSI_ERR_CONN_FAILED);
 810                 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
 811                                       "control PDU: OOM\n");
 812                 return -ENOMEM;
 813         }
 814
 815         nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
 816         ev = NLMSG_DATA(nlh);
 817         memset(ev, 0, sizeof(*ev));
 818         ev->transport_handle = iscsi_handle(conn->transport);
 819         ev->type = ISCSI_KEVENT_RECV_PDU;
 820         ev->r.recv_req.cid = conn->cid;
 821         ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
 822         pdu = (char*)ev + sizeof(*ev);
 823         memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
 824         memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
 825
 826         return iscsi_unicast_skb(skb, priv->daemon_pid);
 827 }
 828 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
 829
 830 void iscsi_conn_error(struct iscsi_cls_conn *conn, enum iscsi_err error)
 831 {
 832         struct nlmsghdr *nlh;
 833         struct sk_buff  *skb;
 834         struct iscsi_uevent *ev;
 835         struct iscsi_internal *priv;
 836         int len = NLMSG_SPACE(sizeof(*ev));
 837
 838         priv = iscsi_if_transport_lookup(conn->transport);
 839         if (!priv)
 840                 return;
 841
 842         skb = alloc_skb(len, GFP_ATOMIC);
 843         if (!skb) {
 844                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
 845                                       "conn error (%d)\n", error);
 846                 return;
 847         }
 848
 849         nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
 850         ev = NLMSG_DATA(nlh);
 851         ev->transport_handle = iscsi_handle(conn->transport);
 852         ev->type = ISCSI_KEVENT_CONN_ERROR;
 853         ev->r.connerror.error = error;
 854         ev->r.connerror.cid = conn->cid;
 855         ev->r.connerror.sid = iscsi_conn_get_sid(conn);
 856
 857         iscsi_broadcast_skb(skb, GFP_ATOMIC);
 858
 859         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
 860                               error);
 861 }
 862 EXPORT_SYMBOL_GPL(iscsi_conn_error);
 863
 864 static int
 865 iscsi_if_send_reply(int pid, int seq, int type, int done, int multi,
 866                       void *payload, int size)
 867 {
 868         struct sk_buff  *skb;
 869         struct nlmsghdr *nlh;
 870         int len = NLMSG_SPACE(size);
 871         int flags = multi ? NLM_F_MULTI : 0;
 872         int t = done ? NLMSG_DONE : type;
 873
 874         skb = alloc_skb(len, GFP_ATOMIC);
 875         if (!skb) {
 876                 printk(KERN_ERR "Could not allocate skb to send reply.\n");
 877                 return -ENOMEM;
 878         }
 879
 880         nlh = __nlmsg_put(skb, pid, seq, t, (len - sizeof(*nlh)), 0);
 881         nlh->nlmsg_flags = flags;
 882         memcpy(NLMSG_DATA(nlh), payload, size);
 883         return iscsi_unicast_skb(skb, pid);
 884 }
 885
 886 static int
 887 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
 888 {
 889         struct iscsi_uevent *ev = NLMSG_DATA(nlh);
 890         struct iscsi_stats *stats;
 891         struct sk_buff *skbstat;
 892         struct iscsi_cls_conn *conn;
 893         struct nlmsghdr *nlhstat;
 894         struct iscsi_uevent *evstat;
 895         struct iscsi_internal *priv;
 896         int len = NLMSG_SPACE(sizeof(*ev) +
 897                               sizeof(struct iscsi_stats) +
 898                               sizeof(struct iscsi_stats_custom) *
 899                               ISCSI_STATS_CUSTOM_MAX);
 900         int err = 0;
 901
 902         priv = iscsi_if_transport_lookup(transport);
 903         if (!priv)
 904                 return -EINVAL;
 905
 906         conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
 907         if (!conn)
 908                 return -EEXIST;
 909
 910         do {
 911                 int actual_size;
 912
 913                 skbstat = alloc_skb(len, GFP_ATOMIC);
 914                 if (!skbstat) {
 915                         iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
 916                                               "deliver stats: OOM\n");
 917                         return -ENOMEM;
 918                 }
 919
 920                 nlhstat = __nlmsg_put(skbstat, priv->daemon_pid, 0, 0,
 921                                       (len - sizeof(*nlhstat)), 0);
 922                 evstat = NLMSG_DATA(nlhstat);
 923                 memset(evstat, 0, sizeof(*evstat));
 924                 evstat->transport_handle = iscsi_handle(conn->transport);
 925                 evstat->type = nlh->nlmsg_type;
 926                 evstat->u.get_stats.cid =
 927                         ev->u.get_stats.cid;
 928                 evstat->u.get_stats.sid =
 929                         ev->u.get_stats.sid;
 930                 stats = (struct iscsi_stats *)
 931                         ((char*)evstat + sizeof(*evstat));
 932                 memset(stats, 0, sizeof(*stats));
 933
 934                 transport->get_stats(conn, stats);
 935                 actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) +
 936                                           sizeof(struct iscsi_stats) +
 937                                           sizeof(struct iscsi_stats_custom) *
 938                                           stats->custom_length);
 939                 actual_size -= sizeof(*nlhstat);
 940                 actual_size = NLMSG_LENGTH(actual_size);
 941                 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
 942                 nlhstat->nlmsg_len = actual_size;
 943
 944                 err = iscsi_unicast_skb(skbstat, priv->daemon_pid);
 945         } while (err < 0 && err != -ECONNREFUSED);
 946
 947         return err;
 948 }
 949
 950 /**
 951  * iscsi_session_event - send session destr. completion event
 952  * @session: iscsi class session
 953  * @event: type of event
 954  */
 955 int iscsi_session_event(struct iscsi_cls_session *session,
 956                         enum iscsi_uevent_e event)
 957 {
 958         struct iscsi_internal *priv;
 959         struct Scsi_Host *shost;
 960         struct iscsi_uevent *ev;
 961         struct sk_buff  *skb;
 962         struct nlmsghdr *nlh;
 963         int rc, len = NLMSG_SPACE(sizeof(*ev));
 964
 965         priv = iscsi_if_transport_lookup(session->transport);
 966         if (!priv)
 967                 return -EINVAL;
 968         shost = iscsi_session_to_shost(session);
 969
 970         skb = alloc_skb(len, GFP_KERNEL);
 971         if (!skb) {
 972                 iscsi_cls_session_printk(KERN_ERR, session,
 973                                          "Cannot notify userspace of session "
 974                                          "event %u\n", event);
 975                 return -ENOMEM;
 976         }
 977
 978         nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
 979         ev = NLMSG_DATA(nlh);
 980         ev->transport_handle = iscsi_handle(session->transport);
 981
 982         ev->type = event;
 983         switch (event) {
 984         case ISCSI_KEVENT_DESTROY_SESSION:
 985                 ev->r.d_session.host_no = shost->host_no;
 986                 ev->r.d_session.sid = session->sid;
 987                 break;
 988         case ISCSI_KEVENT_CREATE_SESSION:
 989                 ev->r.c_session_ret.host_no = shost->host_no;
 990                 ev->r.c_session_ret.sid = session->sid;
 991                 break;
 992         case ISCSI_KEVENT_UNBIND_SESSION:
 993                 ev->r.unbind_session.host_no = shost->host_no;
 994                 ev->r.unbind_session.sid = session->sid;
 995                 break;
 996         default:
 997                 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
 998                                          "%u.\n", event);
 999                 kfree_skb(skb);
1000                 return -EINVAL;
1001         }
1002
1003         /*
1004          * this will occur if the daemon is not up, so we just warn
1005          * the user and when the daemon is restarted it will handle it
1006          */
1007         rc = iscsi_broadcast_skb(skb, GFP_KERNEL);
1008         if (rc < 0)
1009                 iscsi_cls_session_printk(KERN_ERR, session,
1010                                          "Cannot notify userspace of session "
1011                                          "event %u. Check iscsi daemon\n",
1012                                          event);
1013         return rc;
1014 }
1015 EXPORT_SYMBOL_GPL(iscsi_session_event);
1016
1017 static int
1018 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_uevent *ev)
1019 {
1020         struct iscsi_transport *transport = priv->iscsi_transport;
1021         struct iscsi_cls_session *session;
1022         uint32_t hostno;
1023
1024         session = transport->create_session(transport, &priv->t,
1025                                             ev->u.c_session.cmds_max,
1026                                             ev->u.c_session.queue_depth,
1027                                             ev->u.c_session.initial_cmdsn,
1028                                             &hostno);
1029         if (!session)
1030                 return -ENOMEM;
1031
1032         ev->r.c_session_ret.host_no = hostno;
1033         ev->r.c_session_ret.sid = session->sid;
1034         return 0;
1035 }
1036
1037 static int
1038 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1039 {
1040         struct iscsi_cls_conn *conn;
1041         struct iscsi_cls_session *session;
1042
1043         session = iscsi_session_lookup(ev->u.c_conn.sid);
1044         if (!session) {
1045                 printk(KERN_ERR "iscsi: invalid session %d.\n",
1046                        ev->u.c_conn.sid);
1047                 return -EINVAL;
1048         }
1049
1050         conn = transport->create_conn(session, ev->u.c_conn.cid);
1051         if (!conn) {
1052                 iscsi_cls_session_printk(KERN_ERR, session,
1053                                          "couldn't create a new connection.");
1054                 return -ENOMEM;
1055         }
1056
1057         ev->r.c_conn_ret.sid = session->sid;
1058         ev->r.c_conn_ret.cid = conn->cid;
1059         return 0;
1060 }
1061
1062 static int
1063 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1064 {
1065         struct iscsi_cls_conn *conn;
1066
1067         conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
1068         if (!conn)
1069                 return -EINVAL;
1070
1071         if (transport->destroy_conn)
1072                 transport->destroy_conn(conn);
1073         return 0;
1074 }
1075
1076 static int
1077 iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1078 {
1079         char *data = (char*)ev + sizeof(*ev);
1080         struct iscsi_cls_conn *conn;
1081         struct iscsi_cls_session *session;
1082         int err = 0, value = 0;
1083
1084         session = iscsi_session_lookup(ev->u.set_param.sid);
1085         conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
1086         if (!conn || !session)
1087                 return -EINVAL;
1088
1089         switch (ev->u.set_param.param) {
1090         case ISCSI_PARAM_SESS_RECOVERY_TMO:
1091                 sscanf(data, "%d", &value);
1092                 if (value != 0)
1093                         session->recovery_tmo = value;
1094                 break;
1095         default:
1096                 err = transport->set_param(conn, ev->u.set_param.param,
1097                                            data, ev->u.set_param.len);
1098         }
1099
1100         return err;
1101 }
1102
1103 static int
1104 iscsi_if_transport_ep(struct iscsi_transport *transport,
1105                       struct iscsi_uevent *ev, int msg_type)
1106 {
1107         struct sockaddr *dst_addr;
1108         int rc = 0;
1109
1110         switch (msg_type) {
1111         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1112                 if (!transport->ep_connect)
1113                         return -EINVAL;
1114
1115                 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1116                 rc = transport->ep_connect(dst_addr,
1117                                            ev->u.ep_connect.non_blocking,
1118                                            &ev->r.ep_connect_ret.handle);
1119                 break;
1120         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1121                 if (!transport->ep_poll)
1122                         return -EINVAL;
1123
1124                 ev->r.retcode = transport->ep_poll(ev->u.ep_poll.ep_handle,
1125                                                    ev->u.ep_poll.timeout_ms);
1126                 break;
1127         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1128                 if (!transport->ep_disconnect)
1129                         return -EINVAL;
1130
1131                 transport->ep_disconnect(ev->u.ep_disconnect.ep_handle);
1132                 break;
1133         }
1134         return rc;
1135 }
1136
1137 static int
1138 iscsi_tgt_dscvr(struct iscsi_transport *transport,
1139                 struct iscsi_uevent *ev)
1140 {
1141         struct Scsi_Host *shost;
1142         struct sockaddr *dst_addr;
1143         int err;
1144
1145         if (!transport->tgt_dscvr)
1146                 return -EINVAL;
1147
1148         shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
1149         if (IS_ERR(shost)) {
1150                 printk(KERN_ERR "target discovery could not find host no %u\n",
1151                        ev->u.tgt_dscvr.host_no);
1152                 return -ENODEV;
1153         }
1154
1155
1156         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1157         err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
1158                                    ev->u.tgt_dscvr.enable, dst_addr);
1159         scsi_host_put(shost);
1160         return err;
1161 }
1162
1163 static int
1164 iscsi_set_host_param(struct iscsi_transport *transport,
1165                      struct iscsi_uevent *ev)
1166 {
1167         char *data = (char*)ev + sizeof(*ev);
1168         struct Scsi_Host *shost;
1169         int err;
1170
1171         if (!transport->set_host_param)
1172                 return -ENOSYS;
1173
1174         shost = scsi_host_lookup(ev->u.set_host_param.host_no);
1175         if (IS_ERR(shost)) {
1176                 printk(KERN_ERR "set_host_param could not find host no %u\n",
1177                        ev->u.set_host_param.host_no);
1178                 return -ENODEV;
1179         }
1180
1181         err = transport->set_host_param(shost, ev->u.set_host_param.param,
1182                                         data, ev->u.set_host_param.len);
1183         scsi_host_put(shost);
1184         return err;
1185 }
1186
1187 static int
1188 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1189 {
1190         int err = 0;
1191         struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1192         struct iscsi_transport *transport = NULL;
1193         struct iscsi_internal *priv;
1194         struct iscsi_cls_session *session;
1195         struct iscsi_cls_conn *conn;
1196
1197         priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
1198         if (!priv)
1199                 return -EINVAL;
1200         transport = priv->iscsi_transport;
1201
1202         if (!try_module_get(transport->owner))
1203                 return -EINVAL;
1204
1205         priv->daemon_pid = NETLINK_CREDS(skb)->pid;
1206
1207         switch (nlh->nlmsg_type) {
1208         case ISCSI_UEVENT_CREATE_SESSION:
1209                 err = iscsi_if_create_session(priv, ev);
1210                 break;
1211         case ISCSI_UEVENT_DESTROY_SESSION:
1212                 session = iscsi_session_lookup(ev->u.d_session.sid);
1213                 if (session)
1214                         transport->destroy_session(session);
1215                 else
1216                         err = -EINVAL;
1217                 break;
1218         case ISCSI_UEVENT_UNBIND_SESSION:
1219                 session = iscsi_session_lookup(ev->u.d_session.sid);
1220                 if (session)
1221                         iscsi_unbind_session(session);
1222                 else
1223                         err = -EINVAL;
1224                 break;
1225         case ISCSI_UEVENT_CREATE_CONN:
1226                 err = iscsi_if_create_conn(transport, ev);
1227                 break;
1228         case ISCSI_UEVENT_DESTROY_CONN:
1229                 err = iscsi_if_destroy_conn(transport, ev);
1230                 break;
1231         case ISCSI_UEVENT_BIND_CONN:
1232                 session = iscsi_session_lookup(ev->u.b_conn.sid);
1233                 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
1234
1235                 if (session && conn)
1236                         ev->r.retcode = transport->bind_conn(session, conn,
1237                                         ev->u.b_conn.transport_eph,
1238                                         ev->u.b_conn.is_leading);
1239                 else
1240                         err = -EINVAL;
1241                 break;
1242         case ISCSI_UEVENT_SET_PARAM:
1243                 err = iscsi_set_param(transport, ev);
1244                 break;
1245         case ISCSI_UEVENT_START_CONN:
1246                 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
1247                 if (conn)
1248                         ev->r.retcode = transport->start_conn(conn);
1249                 else
1250                         err = -EINVAL;
1251                 break;
1252         case ISCSI_UEVENT_STOP_CONN:
1253                 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
1254                 if (conn)
1255                         transport->stop_conn(conn, ev->u.stop_conn.flag);
1256                 else
1257                         err = -EINVAL;
1258                 break;
1259         case ISCSI_UEVENT_SEND_PDU:
1260                 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
1261                 if (conn)
1262                         ev->r.retcode = transport->send_pdu(conn,
1263                                 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
1264                                 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
1265                                 ev->u.send_pdu.data_size);
1266                 else
1267                         err = -EINVAL;
1268                 break;
1269         case ISCSI_UEVENT_GET_STATS:
1270                 err = iscsi_if_get_stats(transport, nlh);
1271                 break;
1272         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1273         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1274         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1275                 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
1276                 break;
1277         case ISCSI_UEVENT_TGT_DSCVR:
1278                 err = iscsi_tgt_dscvr(transport, ev);
1279                 break;
1280         case ISCSI_UEVENT_SET_HOST_PARAM:
1281                 err = iscsi_set_host_param(transport, ev);
1282                 break;
1283         default:
1284                 err = -ENOSYS;
1285                 break;
1286         }
1287
1288         module_put(transport->owner);
1289         return err;
1290 }
1291
1292 /*
1293  * Get message from skb.  Each message is processed by iscsi_if_recv_msg.
1294  * Malformed skbs with wrong lengths or invalid creds are not processed.
1295  */
1296 static void
1297 iscsi_if_rx(struct sk_buff *skb)
1298 {
1299         mutex_lock(&rx_queue_mutex);
1300         while (skb->len >= NLMSG_SPACE(0)) {
1301                 int err;
1302                 uint32_t rlen;
1303                 struct nlmsghdr *nlh;
1304                 struct iscsi_uevent *ev;
1305
1306                 nlh = nlmsg_hdr(skb);
1307                 if (nlh->nlmsg_len < sizeof(*nlh) ||
1308                     skb->len < nlh->nlmsg_len) {
1309                         break;
1310                 }
1311
1312                 ev = NLMSG_DATA(nlh);
1313                 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
1314                 if (rlen > skb->len)
1315                         rlen = skb->len;
1316
1317                 err = iscsi_if_recv_msg(skb, nlh);
1318                 if (err) {
1319                         ev->type = ISCSI_KEVENT_IF_ERROR;
1320                         ev->iferror = err;
1321                 }
1322                 do {
1323                         /*
1324                          * special case for GET_STATS:
1325                          * on success - sending reply and stats from
1326                          * inside of if_recv_msg(),
1327                          * on error - fall through.
1328                          */
1329                         if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
1330                                 break;
1331                         err = iscsi_if_send_reply(
1332                                 NETLINK_CREDS(skb)->pid, nlh->nlmsg_seq,
1333                                 nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
1334                 } while (err < 0 && err != -ECONNREFUSED);
1335                 skb_pull(skb, rlen);
1336         }
1337         mutex_unlock(&rx_queue_mutex);
1338 }
1339
1340 #define iscsi_cdev_to_conn(_cdev) \
1341         iscsi_dev_to_conn(_cdev->dev)
1342
1343 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store)              \
1344 struct class_device_attribute class_device_attr_##_prefix##_##_name =   \
1345         __ATTR(_name,_mode,_show,_store)
1346
1347 /*
1348  * iSCSI connection attrs
1349  */
1350 #define iscsi_conn_attr_show(param)                                     \
1351 static ssize_t                                                          \
1352 show_conn_param_##param(struct class_device *cdev, char *buf)           \
1353 {                                                                       \
1354         struct iscsi_cls_conn *conn = iscsi_cdev_to_conn(cdev);         \
1355         struct iscsi_transport *t = conn->transport;                    \
1356         return t->get_conn_param(conn, param, buf);                     \
1357 }
1358
1359 #define iscsi_conn_attr(field, param)                                   \
1360         iscsi_conn_attr_show(param)                                     \
1361 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param,  \
1362                         NULL);
1363
1364 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
1365 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
1366 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
1367 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
1368 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
1369 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
1370 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
1371 iscsi_conn_attr(port, ISCSI_PARAM_CONN_PORT);
1372 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
1373 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
1374 iscsi_conn_attr(address, ISCSI_PARAM_CONN_ADDRESS);
1375 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
1376 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
1377
1378 #define iscsi_cdev_to_session(_cdev) \
1379         iscsi_dev_to_session(_cdev->dev)
1380
1381 /*
1382  * iSCSI session attrs
1383  */
1384 #define iscsi_session_attr_show(param, perm)                            \
1385 static ssize_t                                                          \
1386 show_session_param_##param(struct class_device *cdev, char *buf)        \
1387 {                                                                       \
1388         struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev); \
1389         struct iscsi_transport *t = session->transport;                 \
1390                                                                         \
1391         if (perm && !capable(CAP_SYS_ADMIN))                            \
1392                 return -EACCES;                                         \
1393         return t->get_session_param(session, param, buf);               \
1394 }
1395
1396 #define iscsi_session_attr(field, param, perm)                          \
1397         iscsi_session_attr_show(param, perm)                            \
1398 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
1399                         NULL);
1400
1401 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
1402 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
1403 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
1404 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
1405 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
1406 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
1407 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
1408 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
1409 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
1410 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
1411 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
1412 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
1413 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
1414 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
1415 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
1416 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
1417 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
1418
1419 static ssize_t
1420 show_priv_session_state(struct class_device *cdev, char *buf)
1421 {
1422         struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev);
1423         return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
1424 }
1425 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
1426                         NULL);
1427
1428 #define iscsi_priv_session_attr_show(field, format)                     \
1429 static ssize_t                                                          \
1430 show_priv_session_##field(struct class_device *cdev, char *buf)         \
1431 {                                                                       \
1432         struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev);\
1433         return sprintf(buf, format"\n", session->field);                \
1434 }
1435
1436 #define iscsi_priv_session_attr(field, format)                          \
1437         iscsi_priv_session_attr_show(field, format)                     \
1438 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO, show_priv_session_##field, \
1439                         NULL)
1440 iscsi_priv_session_attr(recovery_tmo, "%d");
1441
1442 /*
1443  * iSCSI host attrs
1444  */
1445 #define iscsi_host_attr_show(param)                                     \
1446 static ssize_t                                                          \
1447 show_host_param_##param(struct class_device *cdev, char *buf)           \
1448 {                                                                       \
1449         struct Scsi_Host *shost = transport_class_to_shost(cdev);       \
1450         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
1451         return priv->iscsi_transport->get_host_param(shost, param, buf); \
1452 }
1453
1454 #define iscsi_host_attr(field, param)                                   \
1455         iscsi_host_attr_show(param)                                     \
1456 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param,  \
1457                         NULL);
1458
1459 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
1460 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
1461 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
1462 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
1463
1464 #define SETUP_PRIV_SESSION_RD_ATTR(field)                               \
1465 do {                                                                    \
1466         priv->session_attrs[count] = &class_device_attr_priv_sess_##field; \
1467         count++;                                                        \
1468 } while (0)
1469
1470
1471 #define SETUP_SESSION_RD_ATTR(field, param_flag)                        \
1472 do {                                                                    \
1473         if (tt->param_mask & param_flag) {                              \
1474                 priv->session_attrs[count] = &class_device_attr_sess_##field; \
1475                 count++;                                                \
1476         }                                                               \
1477 } while (0)
1478
1479 #define SETUP_CONN_RD_ATTR(field, param_flag)                           \
1480 do {                                                                    \
1481         if (tt->param_mask & param_flag) {                              \
1482                 priv->conn_attrs[count] = &class_device_attr_conn_##field; \
1483                 count++;                                                \
1484         }                                                               \
1485 } while (0)
1486
1487 #define SETUP_HOST_RD_ATTR(field, param_flag)                           \
1488 do {                                                                    \
1489         if (tt->host_param_mask & param_flag) {                         \
1490                 priv->host_attrs[count] = &class_device_attr_host_##field; \
1491                 count++;                                                \
1492         }                                                               \
1493 } while (0)
1494
1495 static int iscsi_session_match(struct attribute_container *cont,
1496                            struct device *dev)
1497 {
1498         struct iscsi_cls_session *session;
1499         struct Scsi_Host *shost;
1500         struct iscsi_internal *priv;
1501
1502         if (!iscsi_is_session_dev(dev))
1503                 return 0;
1504
1505         session = iscsi_dev_to_session(dev);
1506         shost = iscsi_session_to_shost(session);
1507         if (!shost->transportt)
1508                 return 0;
1509
1510         priv = to_iscsi_internal(shost->transportt);
1511         if (priv->session_cont.ac.class != &iscsi_session_class.class)
1512                 return 0;
1513
1514         return &priv->session_cont.ac == cont;
1515 }
1516
1517 static int iscsi_conn_match(struct attribute_container *cont,
1518                            struct device *dev)
1519 {
1520         struct iscsi_cls_session *session;
1521         struct iscsi_cls_conn *conn;
1522         struct Scsi_Host *shost;
1523         struct iscsi_internal *priv;
1524
1525         if (!iscsi_is_conn_dev(dev))
1526                 return 0;
1527
1528         conn = iscsi_dev_to_conn(dev);
1529         session = iscsi_dev_to_session(conn->dev.parent);
1530         shost = iscsi_session_to_shost(session);
1531
1532         if (!shost->transportt)
1533                 return 0;
1534
1535         priv = to_iscsi_internal(shost->transportt);
1536         if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
1537                 return 0;
1538
1539         return &priv->conn_cont.ac == cont;
1540 }
1541
1542 static int iscsi_host_match(struct attribute_container *cont,
1543                             struct device *dev)
1544 {
1545         struct Scsi_Host *shost;
1546         struct iscsi_internal *priv;
1547
1548         if (!scsi_is_host_device(dev))
1549                 return 0;
1550
1551         shost = dev_to_shost(dev);
1552         if (!shost->transportt  ||
1553             shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
1554                 return 0;
1555
1556         priv = to_iscsi_internal(shost->transportt);
1557         return &priv->t.host_attrs.ac == cont;
1558 }
1559
1560 struct scsi_transport_template *
1561 iscsi_register_transport(struct iscsi_transport *tt)
1562 {
1563         struct iscsi_internal *priv;
1564         unsigned long flags;
1565         int count = 0, err;
1566
1567         BUG_ON(!tt);
1568
1569         priv = iscsi_if_transport_lookup(tt);
1570         if (priv)
1571                 return NULL;
1572
1573         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1574         if (!priv)
1575                 return NULL;
1576         INIT_LIST_HEAD(&priv->list);
1577         priv->daemon_pid = -1;
1578         priv->iscsi_transport = tt;
1579         priv->t.user_scan = iscsi_user_scan;
1580
1581         priv->cdev.class = &iscsi_transport_class;
1582         snprintf(priv->cdev.class_id, BUS_ID_SIZE, "%s", tt->name);
1583         err = class_device_register(&priv->cdev);
1584         if (err)
1585                 goto free_priv;
1586
1587         err = sysfs_create_group(&priv->cdev.kobj, &iscsi_transport_group);
1588         if (err)
1589                 goto unregister_cdev;
1590
1591         /* host parameters */
1592         priv->t.host_attrs.ac.attrs = &priv->host_attrs[0];
1593         priv->t.host_attrs.ac.class = &iscsi_host_class.class;
1594         priv->t.host_attrs.ac.match = iscsi_host_match;
1595         priv->t.host_size = sizeof(struct iscsi_host);
1596         transport_container_register(&priv->t.host_attrs);
1597
1598         SETUP_HOST_RD_ATTR(netdev, ISCSI_HOST_NETDEV_NAME);
1599         SETUP_HOST_RD_ATTR(ipaddress, ISCSI_HOST_IPADDRESS);
1600         SETUP_HOST_RD_ATTR(hwaddress, ISCSI_HOST_HWADDRESS);
1601         SETUP_HOST_RD_ATTR(initiatorname, ISCSI_HOST_INITIATOR_NAME);
1602         BUG_ON(count > ISCSI_HOST_ATTRS);
1603         priv->host_attrs[count] = NULL;
1604         count = 0;
1605
1606         /* connection parameters */
1607         priv->conn_cont.ac.attrs = &priv->conn_attrs[0];
1608         priv->conn_cont.ac.class = &iscsi_connection_class.class;
1609         priv->conn_cont.ac.match = iscsi_conn_match;
1610         transport_container_register(&priv->conn_cont);
1611
1612         SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_MAX_RECV_DLENGTH);
1613         SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_MAX_XMIT_DLENGTH);
1614         SETUP_CONN_RD_ATTR(header_digest, ISCSI_HDRDGST_EN);
1615         SETUP_CONN_RD_ATTR(data_digest, ISCSI_DATADGST_EN);
1616         SETUP_CONN_RD_ATTR(ifmarker, ISCSI_IFMARKER_EN);
1617         SETUP_CONN_RD_ATTR(ofmarker, ISCSI_OFMARKER_EN);
1618         SETUP_CONN_RD_ATTR(address, ISCSI_CONN_ADDRESS);
1619         SETUP_CONN_RD_ATTR(port, ISCSI_CONN_PORT);
1620         SETUP_CONN_RD_ATTR(exp_statsn, ISCSI_EXP_STATSN);
1621         SETUP_CONN_RD_ATTR(persistent_address, ISCSI_PERSISTENT_ADDRESS);
1622         SETUP_CONN_RD_ATTR(persistent_port, ISCSI_PERSISTENT_PORT);
1623         SETUP_CONN_RD_ATTR(ping_tmo, ISCSI_PING_TMO);
1624         SETUP_CONN_RD_ATTR(recv_tmo, ISCSI_RECV_TMO);
1625
1626         BUG_ON(count > ISCSI_CONN_ATTRS);
1627         priv->conn_attrs[count] = NULL;
1628         count = 0;
1629
1630         /* session parameters */
1631         priv->session_cont.ac.attrs = &priv->session_attrs[0];
1632         priv->session_cont.ac.class = &iscsi_session_class.class;
1633         priv->session_cont.ac.match = iscsi_session_match;
1634         transport_container_register(&priv->session_cont);
1635
1636         SETUP_SESSION_RD_ATTR(initial_r2t, ISCSI_INITIAL_R2T_EN);
1637         SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_MAX_R2T);
1638         SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_IMM_DATA_EN);
1639         SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_FIRST_BURST);
1640         SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_MAX_BURST);
1641         SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PDU_INORDER_EN);
1642         SETUP_SESSION_RD_ATTR(data_seq_in_order, ISCSI_DATASEQ_INORDER_EN);
1643         SETUP_SESSION_RD_ATTR(erl, ISCSI_ERL);
1644         SETUP_SESSION_RD_ATTR(targetname, ISCSI_TARGET_NAME);
1645         SETUP_SESSION_RD_ATTR(tpgt, ISCSI_TPGT);
1646         SETUP_SESSION_RD_ATTR(password, ISCSI_USERNAME);
1647         SETUP_SESSION_RD_ATTR(password_in, ISCSI_USERNAME_IN);
1648         SETUP_SESSION_RD_ATTR(username, ISCSI_PASSWORD);
1649         SETUP_SESSION_RD_ATTR(username_in, ISCSI_PASSWORD_IN);
1650         SETUP_SESSION_RD_ATTR(fast_abort, ISCSI_FAST_ABORT);
1651         SETUP_SESSION_RD_ATTR(abort_tmo, ISCSI_ABORT_TMO);
1652         SETUP_SESSION_RD_ATTR(lu_reset_tmo,ISCSI_LU_RESET_TMO);
1653         SETUP_PRIV_SESSION_RD_ATTR(recovery_tmo);
1654         SETUP_PRIV_SESSION_RD_ATTR(state);
1655
1656         BUG_ON(count > ISCSI_SESSION_ATTRS);
1657         priv->session_attrs[count] = NULL;
1658
1659         spin_lock_irqsave(&iscsi_transport_lock, flags);
1660         list_add(&priv->list, &iscsi_transports);
1661         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1662
1663         printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
1664         return &priv->t;
1665
1666 unregister_cdev:
1667         class_device_unregister(&priv->cdev);
1668 free_priv:
1669         kfree(priv);
1670         return NULL;
1671 }
1672 EXPORT_SYMBOL_GPL(iscsi_register_transport);
1673
1674 int iscsi_unregister_transport(struct iscsi_transport *tt)
1675 {
1676         struct iscsi_internal *priv;
1677         unsigned long flags;
1678
1679         BUG_ON(!tt);
1680
1681         mutex_lock(&rx_queue_mutex);
1682
1683         priv = iscsi_if_transport_lookup(tt);
1684         BUG_ON (!priv);
1685
1686         spin_lock_irqsave(&iscsi_transport_lock, flags);
1687         list_del(&priv->list);
1688         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1689
1690         transport_container_unregister(&priv->conn_cont);
1691         transport_container_unregister(&priv->session_cont);
1692         transport_container_unregister(&priv->t.host_attrs);
1693
1694         sysfs_remove_group(&priv->cdev.kobj, &iscsi_transport_group);
1695         class_device_unregister(&priv->cdev);
1696         mutex_unlock(&rx_queue_mutex);
1697
1698         return 0;
1699 }
1700 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
1701
1702 static __init int iscsi_transport_init(void)
1703 {
1704         int err;
1705
1706         printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
1707                 ISCSI_TRANSPORT_VERSION);
1708
1709         atomic_set(&iscsi_session_nr, 0);
1710
1711         err = class_register(&iscsi_transport_class);
1712         if (err)
1713                 return err;
1714
1715         err = transport_class_register(&iscsi_host_class);
1716         if (err)
1717                 goto unregister_transport_class;
1718
1719         err = transport_class_register(&iscsi_connection_class);
1720         if (err)
1721                 goto unregister_host_class;
1722
1723         err = transport_class_register(&iscsi_session_class);
1724         if (err)
1725                 goto unregister_conn_class;
1726
1727         nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, 1, iscsi_if_rx, NULL,
1728                         THIS_MODULE);
1729         if (!nls) {
1730                 err = -ENOBUFS;
1731                 goto unregister_session_class;
1732         }
1733
1734         iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
1735         if (!iscsi_eh_timer_workq)
1736                 goto release_nls;
1737
1738         return 0;
1739
1740 release_nls:
1741         netlink_kernel_release(nls);
1742 unregister_session_class:
1743         transport_class_unregister(&iscsi_session_class);
1744 unregister_conn_class:
1745         transport_class_unregister(&iscsi_connection_class);
1746 unregister_host_class:
1747         transport_class_unregister(&iscsi_host_class);
1748 unregister_transport_class:
1749         class_unregister(&iscsi_transport_class);
1750         return err;
1751 }
1752
1753 static void __exit iscsi_transport_exit(void)
1754 {
1755         destroy_workqueue(iscsi_eh_timer_workq);
1756         netlink_kernel_release(nls);
1757         transport_class_unregister(&iscsi_connection_class);
1758         transport_class_unregister(&iscsi_session_class);
1759         transport_class_unregister(&iscsi_host_class);
1760         class_unregister(&iscsi_transport_class);
1761 }
1762
1763 module_init(iscsi_transport_init);
1764 module_exit(iscsi_transport_exit);
1765
1766 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
1767               "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
1768               "Alex Aizman <itn780@yahoo.com>");
1769 MODULE_DESCRIPTION("iSCSI Transport Interface");
1770 MODULE_LICENSE("GPL");
1771 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);