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 21
  34 #define ISCSI_CONN_ATTRS 13
  35 #define ISCSI_HOST_ATTRS 4
  36
  37 #define ISCSI_TRANSPORT_VERSION "2.0-870"
  38
  39 struct iscsi_internal {
  40         int daemon_pid;
  41         struct scsi_transport_template t;
  42         struct iscsi_transport *iscsi_transport;
  43         struct list_head list;
  44         struct device dev;
  45
  46         struct device_attribute *host_attrs[ISCSI_HOST_ATTRS + 1];
  47         struct transport_container conn_cont;
  48         struct device_attribute *conn_attrs[ISCSI_CONN_ATTRS + 1];
  49         struct transport_container session_cont;
  50         struct device_attribute *session_attrs[ISCSI_SESSION_ATTRS + 1];
  51 };
  52
  53 static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
  54 static struct workqueue_struct *iscsi_eh_timer_workq;
  55
  56 /*
  57  * list of registered transports and lock that must
  58  * be held while accessing list. The iscsi_transport_lock must
  59  * be acquired after the rx_queue_mutex.
  60  */
  61 static LIST_HEAD(iscsi_transports);
  62 static DEFINE_SPINLOCK(iscsi_transport_lock);
  63
  64 #define to_iscsi_internal(tmpl) \
  65         container_of(tmpl, struct iscsi_internal, t)
  66
  67 #define dev_to_iscsi_internal(_dev) \
  68         container_of(_dev, struct iscsi_internal, dev)
  69
  70 static void iscsi_transport_release(struct device *dev)
  71 {
  72         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
  73         kfree(priv);
  74 }
  75
  76 /*
  77  * iscsi_transport_class represents the iscsi_transports that are
  78  * registered.
  79  */
  80 static struct class iscsi_transport_class = {
  81         .name = "iscsi_transport",
  82         .dev_release = iscsi_transport_release,
  83 };
  84
  85 static ssize_t
  86 show_transport_handle(struct device *dev, struct device_attribute *attr,
  87                       char *buf)
  88 {
  89         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
  90         return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport));
  91 }
  92 static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
  93
  94 #define show_transport_attr(name, format)                               \
  95 static ssize_t                                                          \
  96 show_transport_##name(struct device *dev,                               \
  97                       struct device_attribute *attr,char *buf)          \
  98 {                                                                       \
  99         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);       \
 100         return sprintf(buf, format"\n", priv->iscsi_transport->name);   \
 101 }                                                                       \
 102 static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
 103
 104 show_transport_attr(caps, "0x%x");
 105
 106 static struct attribute *iscsi_transport_attrs[] = {
 107         &dev_attr_handle.attr,
 108         &dev_attr_caps.attr,
 109         NULL,
 110 };
 111
 112 static struct attribute_group iscsi_transport_group = {
 113         .attrs = iscsi_transport_attrs,
 114 };
 115
 116 /*
 117  * iSCSI endpoint attrs
 118  */
 119 #define iscsi_dev_to_endpoint(_dev) \
 120         container_of(_dev, struct iscsi_endpoint, dev)
 121
 122 #define ISCSI_ATTR(_prefix,_name,_mode,_show,_store)    \
 123 struct device_attribute dev_attr_##_prefix##_##_name =  \
 124         __ATTR(_name,_mode,_show,_store)
 125
 126 static void iscsi_endpoint_release(struct device *dev)
 127 {
 128         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 129         kfree(ep);
 130 }
 131
 132 static struct class iscsi_endpoint_class = {
 133         .name = "iscsi_endpoint",
 134         .dev_release = iscsi_endpoint_release,
 135 };
 136
 137 static ssize_t
 138 show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
 139 {
 140         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 141         return sprintf(buf, "%llu\n", (unsigned long long) ep->id);
 142 }
 143 static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
 144
 145 static struct attribute *iscsi_endpoint_attrs[] = {
 146         &dev_attr_ep_handle.attr,
 147         NULL,
 148 };
 149
 150 static struct attribute_group iscsi_endpoint_group = {
 151         .attrs = iscsi_endpoint_attrs,
 152 };
 153
 154 #define ISCSI_MAX_EPID -1
 155
 156 static int iscsi_match_epid(struct device *dev, void *data)
 157 {
 158         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 159         uint64_t *epid = (uint64_t *) data;
 160
 161         return *epid == ep->id;
 162 }
 163
 164 struct iscsi_endpoint *
 165 iscsi_create_endpoint(int dd_size)
 166 {
 167         struct device *dev;
 168         struct iscsi_endpoint *ep;
 169         uint64_t id;
 170         int err;
 171
 172         for (id = 1; id < ISCSI_MAX_EPID; id++) {
 173                 dev = class_find_device(&iscsi_endpoint_class, NULL, &id,
 174                                         iscsi_match_epid);
 175                 if (!dev)
 176                         break;
 177         }
 178         if (id == ISCSI_MAX_EPID) {
 179                 printk(KERN_ERR "Too many connections. Max supported %u\n",
 180                        ISCSI_MAX_EPID - 1);
 181                 return NULL;
 182         }
 183
 184         ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL);
 185         if (!ep)
 186                 return NULL;
 187
 188         ep->id = id;
 189         ep->dev.class = &iscsi_endpoint_class;
 190         dev_set_name(&ep->dev, "ep-%llu", (unsigned long long) id);
 191         err = device_register(&ep->dev);
 192         if (err)
 193                 goto free_ep;
 194
 195         err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group);
 196         if (err)
 197                 goto unregister_dev;
 198
 199         if (dd_size)
 200                 ep->dd_data = &ep[1];
 201         return ep;
 202
 203 unregister_dev:
 204         device_unregister(&ep->dev);
 205         return NULL;
 206
 207 free_ep:
 208         kfree(ep);
 209         return NULL;
 210 }
 211 EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
 212
 213 void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
 214 {
 215         sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
 216         device_unregister(&ep->dev);
 217 }
 218 EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
 219
 220 struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
 221 {
 222         struct iscsi_endpoint *ep;
 223         struct device *dev;
 224
 225         dev = class_find_device(&iscsi_endpoint_class, NULL, &handle,
 226                                 iscsi_match_epid);
 227         if (!dev)
 228                 return NULL;
 229
 230         ep = iscsi_dev_to_endpoint(dev);
 231         /*
 232          * we can drop this now because the interface will prevent
 233          * removals and lookups from racing.
 234          */
 235         put_device(dev);
 236         return ep;
 237 }
 238 EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
 239
 240 static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
 241                             struct device *cdev)
 242 {
 243         struct Scsi_Host *shost = dev_to_shost(dev);
 244         struct iscsi_cls_host *ihost = shost->shost_data;
 245
 246         memset(ihost, 0, sizeof(*ihost));
 247         atomic_set(&ihost->nr_scans, 0);
 248         mutex_init(&ihost->mutex);
 249         return 0;
 250 }
 251
 252 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
 253                                "iscsi_host",
 254                                iscsi_setup_host,
 255                                NULL,
 256                                NULL);
 257
 258 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
 259                                "iscsi_session",
 260                                NULL,
 261                                NULL,
 262                                NULL);
 263
 264 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
 265                                "iscsi_connection",
 266                                NULL,
 267                                NULL,
 268                                NULL);
 269
 270 static struct sock *nls;
 271 static DEFINE_MUTEX(rx_queue_mutex);
 272
 273 static LIST_HEAD(sesslist);
 274 static DEFINE_SPINLOCK(sesslock);
 275 static LIST_HEAD(connlist);
 276 static DEFINE_SPINLOCK(connlock);
 277
 278 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
 279 {
 280         struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
 281         return sess->sid;
 282 }
 283
 284 /*
 285  * Returns the matching session to a given sid
 286  */
 287 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
 288 {
 289         unsigned long flags;
 290         struct iscsi_cls_session *sess;
 291
 292         spin_lock_irqsave(&sesslock, flags);
 293         list_for_each_entry(sess, &sesslist, sess_list) {
 294                 if (sess->sid == sid) {
 295                         spin_unlock_irqrestore(&sesslock, flags);
 296                         return sess;
 297                 }
 298         }
 299         spin_unlock_irqrestore(&sesslock, flags);
 300         return NULL;
 301 }
 302
 303 /*
 304  * Returns the matching connection to a given sid / cid tuple
 305  */
 306 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
 307 {
 308         unsigned long flags;
 309         struct iscsi_cls_conn *conn;
 310
 311         spin_lock_irqsave(&connlock, flags);
 312         list_for_each_entry(conn, &connlist, conn_list) {
 313                 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
 314                         spin_unlock_irqrestore(&connlock, flags);
 315                         return conn;
 316                 }
 317         }
 318         spin_unlock_irqrestore(&connlock, flags);
 319         return NULL;
 320 }
 321
 322 /*
 323  * The following functions can be used by LLDs that allocate
 324  * their own scsi_hosts or by software iscsi LLDs
 325  */
 326 static struct {
 327         int value;
 328         char *name;
 329 } iscsi_session_state_names[] = {
 330         { ISCSI_SESSION_LOGGED_IN,      "LOGGED_IN" },
 331         { ISCSI_SESSION_FAILED,         "FAILED" },
 332         { ISCSI_SESSION_FREE,           "FREE" },
 333 };
 334
 335 static const char *iscsi_session_state_name(int state)
 336 {
 337         int i;
 338         char *name = NULL;
 339
 340         for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
 341                 if (iscsi_session_state_names[i].value == state) {
 342                         name = iscsi_session_state_names[i].name;
 343                         break;
 344                 }
 345         }
 346         return name;
 347 }
 348
 349 int iscsi_session_chkready(struct iscsi_cls_session *session)
 350 {
 351         unsigned long flags;
 352         int err;
 353
 354         spin_lock_irqsave(&session->lock, flags);
 355         switch (session->state) {
 356         case ISCSI_SESSION_LOGGED_IN:
 357                 err = 0;
 358                 break;
 359         case ISCSI_SESSION_FAILED:
 360                 err = DID_IMM_RETRY << 16;
 361                 break;
 362         case ISCSI_SESSION_FREE:
 363                 err = DID_TRANSPORT_FAILFAST << 16;
 364                 break;
 365         default:
 366                 err = DID_NO_CONNECT << 16;
 367                 break;
 368         }
 369         spin_unlock_irqrestore(&session->lock, flags);
 370         return err;
 371 }
 372 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
 373
 374 static void iscsi_session_release(struct device *dev)
 375 {
 376         struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
 377         struct Scsi_Host *shost;
 378
 379         shost = iscsi_session_to_shost(session);
 380         scsi_host_put(shost);
 381         kfree(session);
 382 }
 383
 384 static int iscsi_is_session_dev(const struct device *dev)
 385 {
 386         return dev->release == iscsi_session_release;
 387 }
 388
 389 static int iscsi_iter_session_fn(struct device *dev, void *data)
 390 {
 391         void (* fn) (struct iscsi_cls_session *) = data;
 392
 393         if (!iscsi_is_session_dev(dev))
 394                 return 0;
 395         fn(iscsi_dev_to_session(dev));
 396         return 0;
 397 }
 398
 399 void iscsi_host_for_each_session(struct Scsi_Host *shost,
 400                                  void (*fn)(struct iscsi_cls_session *))
 401 {
 402         device_for_each_child(&shost->shost_gendev, fn,
 403                               iscsi_iter_session_fn);
 404 }
 405 EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
 406
 407 /**
 408  * iscsi_scan_finished - helper to report when running scans are done
 409  * @shost: scsi host
 410  * @time: scan run time
 411  *
 412  * This function can be used by drives like qla4xxx to report to the scsi
 413  * layer when the scans it kicked off at module load time are done.
 414  */
 415 int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
 416 {
 417         struct iscsi_cls_host *ihost = shost->shost_data;
 418         /*
 419          * qla4xxx will have kicked off some session unblocks before calling
 420          * scsi_scan_host, so just wait for them to complete.
 421          */
 422         return !atomic_read(&ihost->nr_scans);
 423 }
 424 EXPORT_SYMBOL_GPL(iscsi_scan_finished);
 425
 426 struct iscsi_scan_data {
 427         unsigned int channel;
 428         unsigned int id;
 429         unsigned int lun;
 430 };
 431
 432 static int iscsi_user_scan_session(struct device *dev, void *data)
 433 {
 434         struct iscsi_scan_data *scan_data = data;
 435         struct iscsi_cls_session *session;
 436         struct Scsi_Host *shost;
 437         struct iscsi_cls_host *ihost;
 438         unsigned long flags;
 439         unsigned int id;
 440
 441         if (!iscsi_is_session_dev(dev))
 442                 return 0;
 443
 444         session = iscsi_dev_to_session(dev);
 445         shost = iscsi_session_to_shost(session);
 446         ihost = shost->shost_data;
 447
 448         mutex_lock(&ihost->mutex);
 449         spin_lock_irqsave(&session->lock, flags);
 450         if (session->state != ISCSI_SESSION_LOGGED_IN) {
 451                 spin_unlock_irqrestore(&session->lock, flags);
 452                 mutex_unlock(&ihost->mutex);
 453                 return 0;
 454         }
 455         id = session->target_id;
 456         spin_unlock_irqrestore(&session->lock, flags);
 457
 458         if (id != ISCSI_MAX_TARGET) {
 459                 if ((scan_data->channel == SCAN_WILD_CARD ||
 460                      scan_data->channel == 0) &&
 461                     (scan_data->id == SCAN_WILD_CARD ||
 462                      scan_data->id == id))
 463                         scsi_scan_target(&session->dev, 0, id,
 464                                          scan_data->lun, 1);
 465         }
 466         mutex_unlock(&ihost->mutex);
 467         return 0;
 468 }
 469
 470 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
 471                            uint id, uint lun)
 472 {
 473         struct iscsi_scan_data scan_data;
 474
 475         scan_data.channel = channel;
 476         scan_data.id = id;
 477         scan_data.lun = lun;
 478
 479         return device_for_each_child(&shost->shost_gendev, &scan_data,
 480                                      iscsi_user_scan_session);
 481 }
 482
 483 static void iscsi_scan_session(struct work_struct *work)
 484 {
 485         struct iscsi_cls_session *session =
 486                         container_of(work, struct iscsi_cls_session, scan_work);
 487         struct Scsi_Host *shost = iscsi_session_to_shost(session);
 488         struct iscsi_cls_host *ihost = shost->shost_data;
 489         struct iscsi_scan_data scan_data;
 490
 491         scan_data.channel = 0;
 492         scan_data.id = SCAN_WILD_CARD;
 493         scan_data.lun = SCAN_WILD_CARD;
 494
 495         iscsi_user_scan_session(&session->dev, &scan_data);
 496         atomic_dec(&ihost->nr_scans);
 497 }
 498
 499 static void session_recovery_timedout(struct work_struct *work)
 500 {
 501         struct iscsi_cls_session *session =
 502                 container_of(work, struct iscsi_cls_session,
 503                              recovery_work.work);
 504         unsigned long flags;
 505
 506         iscsi_cls_session_printk(KERN_INFO, session,
 507                                  "session recovery timed out after %d secs\n",
 508                                  session->recovery_tmo);
 509
 510         spin_lock_irqsave(&session->lock, flags);
 511         switch (session->state) {
 512         case ISCSI_SESSION_FAILED:
 513                 session->state = ISCSI_SESSION_FREE;
 514                 break;
 515         case ISCSI_SESSION_LOGGED_IN:
 516         case ISCSI_SESSION_FREE:
 517                 /* we raced with the unblock's flush */
 518                 spin_unlock_irqrestore(&session->lock, flags);
 519                 return;
 520         }
 521         spin_unlock_irqrestore(&session->lock, flags);
 522
 523         if (session->transport->session_recovery_timedout)
 524                 session->transport->session_recovery_timedout(session);
 525
 526         scsi_target_unblock(&session->dev);
 527 }
 528
 529 static void __iscsi_unblock_session(struct work_struct *work)
 530 {
 531         struct iscsi_cls_session *session =
 532                         container_of(work, struct iscsi_cls_session,
 533                                      unblock_work);
 534         struct Scsi_Host *shost = iscsi_session_to_shost(session);
 535         struct iscsi_cls_host *ihost = shost->shost_data;
 536         unsigned long flags;
 537
 538         /*
 539          * The recovery and unblock work get run from the same workqueue,
 540          * so try to cancel it if it was going to run after this unblock.
 541          */
 542         cancel_delayed_work(&session->recovery_work);
 543         spin_lock_irqsave(&session->lock, flags);
 544         session->state = ISCSI_SESSION_LOGGED_IN;
 545         spin_unlock_irqrestore(&session->lock, flags);
 546         /* start IO */
 547         scsi_target_unblock(&session->dev);
 548         /*
 549          * Only do kernel scanning if the driver is properly hooked into
 550          * the async scanning code (drivers like iscsi_tcp do login and
 551          * scanning from userspace).
 552          */
 553         if (shost->hostt->scan_finished) {
 554                 if (scsi_queue_work(shost, &session->scan_work))
 555                         atomic_inc(&ihost->nr_scans);
 556         }
 557 }
 558
 559 /**
 560  * iscsi_unblock_session - set a session as logged in and start IO.
 561  * @session: iscsi session
 562  *
 563  * Mark a session as ready to accept IO.
 564  */
 565 void iscsi_unblock_session(struct iscsi_cls_session *session)
 566 {
 567         queue_work(iscsi_eh_timer_workq, &session->unblock_work);
 568         /*
 569          * make sure all the events have completed before tell the driver
 570          * it is safe
 571          */
 572         flush_workqueue(iscsi_eh_timer_workq);
 573 }
 574 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
 575
 576 static void __iscsi_block_session(struct work_struct *work)
 577 {
 578         struct iscsi_cls_session *session =
 579                         container_of(work, struct iscsi_cls_session,
 580                                      block_work);
 581         unsigned long flags;
 582
 583         spin_lock_irqsave(&session->lock, flags);
 584         session->state = ISCSI_SESSION_FAILED;
 585         spin_unlock_irqrestore(&session->lock, flags);
 586         scsi_target_block(&session->dev);
 587         queue_delayed_work(iscsi_eh_timer_workq, &session->recovery_work,
 588                            session->recovery_tmo * HZ);
 589 }
 590
 591 void iscsi_block_session(struct iscsi_cls_session *session)
 592 {
 593         queue_work(iscsi_eh_timer_workq, &session->block_work);
 594 }
 595 EXPORT_SYMBOL_GPL(iscsi_block_session);
 596
 597 static void __iscsi_unbind_session(struct work_struct *work)
 598 {
 599         struct iscsi_cls_session *session =
 600                         container_of(work, struct iscsi_cls_session,
 601                                      unbind_work);
 602         struct Scsi_Host *shost = iscsi_session_to_shost(session);
 603         struct iscsi_cls_host *ihost = shost->shost_data;
 604         unsigned long flags;
 605
 606         /* Prevent new scans and make sure scanning is not in progress */
 607         mutex_lock(&ihost->mutex);
 608         spin_lock_irqsave(&session->lock, flags);
 609         if (session->target_id == ISCSI_MAX_TARGET) {
 610                 spin_unlock_irqrestore(&session->lock, flags);
 611                 mutex_unlock(&ihost->mutex);
 612                 return;
 613         }
 614         session->target_id = ISCSI_MAX_TARGET;
 615         spin_unlock_irqrestore(&session->lock, flags);
 616         mutex_unlock(&ihost->mutex);
 617
 618         scsi_remove_target(&session->dev);
 619         iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
 620 }
 621
 622 struct iscsi_cls_session *
 623 iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
 624                     int dd_size)
 625 {
 626         struct iscsi_cls_session *session;
 627
 628         session = kzalloc(sizeof(*session) + dd_size,
 629                           GFP_KERNEL);
 630         if (!session)
 631                 return NULL;
 632
 633         session->transport = transport;
 634         session->recovery_tmo = 120;
 635         session->state = ISCSI_SESSION_FREE;
 636         INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
 637         INIT_LIST_HEAD(&session->sess_list);
 638         INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
 639         INIT_WORK(&session->block_work, __iscsi_block_session);
 640         INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
 641         INIT_WORK(&session->scan_work, iscsi_scan_session);
 642         spin_lock_init(&session->lock);
 643
 644         /* this is released in the dev's release function */
 645         scsi_host_get(shost);
 646         session->dev.parent = &shost->shost_gendev;
 647         session->dev.release = iscsi_session_release;
 648         device_initialize(&session->dev);
 649         if (dd_size)
 650                 session->dd_data = &session[1];
 651         return session;
 652 }
 653 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
 654
 655 static int iscsi_get_next_target_id(struct device *dev, void *data)
 656 {
 657         struct iscsi_cls_session *session;
 658         unsigned long flags;
 659         int err = 0;
 660
 661         if (!iscsi_is_session_dev(dev))
 662                 return 0;
 663
 664         session = iscsi_dev_to_session(dev);
 665         spin_lock_irqsave(&session->lock, flags);
 666         if (*((unsigned int *) data) == session->target_id)
 667                 err = -EEXIST;
 668         spin_unlock_irqrestore(&session->lock, flags);
 669         return err;
 670 }
 671
 672 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
 673 {
 674         struct Scsi_Host *shost = iscsi_session_to_shost(session);
 675         struct iscsi_cls_host *ihost;
 676         unsigned long flags;
 677         unsigned int id = target_id;
 678         int err;
 679
 680         ihost = shost->shost_data;
 681         session->sid = atomic_add_return(1, &iscsi_session_nr);
 682
 683         if (id == ISCSI_MAX_TARGET) {
 684                 for (id = 0; id < ISCSI_MAX_TARGET; id++) {
 685                         err = device_for_each_child(&shost->shost_gendev, &id,
 686                                                     iscsi_get_next_target_id);
 687                         if (!err)
 688                                 break;
 689                 }
 690
 691                 if (id == ISCSI_MAX_TARGET) {
 692                         iscsi_cls_session_printk(KERN_ERR, session,
 693                                                  "Too many iscsi targets. Max "
 694                                                  "number of targets is %d.\n",
 695                                                  ISCSI_MAX_TARGET - 1);
 696                         goto release_host;
 697                 }
 698         }
 699         session->target_id = id;
 700
 701         dev_set_name(&session->dev, "session%u", session->sid);
 702         err = device_add(&session->dev);
 703         if (err) {
 704                 iscsi_cls_session_printk(KERN_ERR, session,
 705                                          "could not register session's dev\n");
 706                 goto release_host;
 707         }
 708         transport_register_device(&session->dev);
 709
 710         spin_lock_irqsave(&sesslock, flags);
 711         list_add(&session->sess_list, &sesslist);
 712         spin_unlock_irqrestore(&sesslock, flags);
 713
 714         iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
 715         return 0;
 716
 717 release_host:
 718         scsi_host_put(shost);
 719         return err;
 720 }
 721 EXPORT_SYMBOL_GPL(iscsi_add_session);
 722
 723 /**
 724  * iscsi_create_session - create iscsi class session
 725  * @shost: scsi host
 726  * @transport: iscsi transport
 727  * @dd_size: private driver data size
 728  * @target_id: which target
 729  *
 730  * This can be called from a LLD or iscsi_transport.
 731  */
 732 struct iscsi_cls_session *
 733 iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
 734                      int dd_size, unsigned int target_id)
 735 {
 736         struct iscsi_cls_session *session;
 737
 738         session = iscsi_alloc_session(shost, transport, dd_size);
 739         if (!session)
 740                 return NULL;
 741
 742         if (iscsi_add_session(session, target_id)) {
 743                 iscsi_free_session(session);
 744                 return NULL;
 745         }
 746         return session;
 747 }
 748 EXPORT_SYMBOL_GPL(iscsi_create_session);
 749
 750 static void iscsi_conn_release(struct device *dev)
 751 {
 752         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
 753         struct device *parent = conn->dev.parent;
 754
 755         kfree(conn);
 756         put_device(parent);
 757 }
 758
 759 static int iscsi_is_conn_dev(const struct device *dev)
 760 {
 761         return dev->release == iscsi_conn_release;
 762 }
 763
 764 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
 765 {
 766         if (!iscsi_is_conn_dev(dev))
 767                 return 0;
 768         return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
 769 }
 770
 771 void iscsi_remove_session(struct iscsi_cls_session *session)
 772 {
 773         struct Scsi_Host *shost = iscsi_session_to_shost(session);
 774         unsigned long flags;
 775         int err;
 776
 777         spin_lock_irqsave(&sesslock, flags);
 778         list_del(&session->sess_list);
 779         spin_unlock_irqrestore(&sesslock, flags);
 780
 781         /* make sure there are no blocks/unblocks queued */
 782         flush_workqueue(iscsi_eh_timer_workq);
 783         /* make sure the timedout callout is not running */
 784         if (!cancel_delayed_work(&session->recovery_work))
 785                 flush_workqueue(iscsi_eh_timer_workq);
 786         /*
 787          * If we are blocked let commands flow again. The lld or iscsi
 788          * layer should set up the queuecommand to fail commands.
 789          * We assume that LLD will not be calling block/unblock while
 790          * removing the session.
 791          */
 792         spin_lock_irqsave(&session->lock, flags);
 793         session->state = ISCSI_SESSION_FREE;
 794         spin_unlock_irqrestore(&session->lock, flags);
 795
 796         scsi_target_unblock(&session->dev);
 797         /* flush running scans then delete devices */
 798         scsi_flush_work(shost);
 799         __iscsi_unbind_session(&session->unbind_work);
 800
 801         /* hw iscsi may not have removed all connections from session */
 802         err = device_for_each_child(&session->dev, NULL,
 803                                     iscsi_iter_destroy_conn_fn);
 804         if (err)
 805                 iscsi_cls_session_printk(KERN_ERR, session,
 806                                          "Could not delete all connections "
 807                                          "for session. Error %d.\n", err);
 808
 809         transport_unregister_device(&session->dev);
 810         device_del(&session->dev);
 811 }
 812 EXPORT_SYMBOL_GPL(iscsi_remove_session);
 813
 814 void iscsi_free_session(struct iscsi_cls_session *session)
 815 {
 816         iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
 817         put_device(&session->dev);
 818 }
 819 EXPORT_SYMBOL_GPL(iscsi_free_session);
 820
 821 /**
 822  * iscsi_destroy_session - destroy iscsi session
 823  * @session: iscsi_session
 824  *
 825  * Can be called by a LLD or iscsi_transport. There must not be
 826  * any running connections.
 827  */
 828 int iscsi_destroy_session(struct iscsi_cls_session *session)
 829 {
 830         iscsi_remove_session(session);
 831         iscsi_free_session(session);
 832         return 0;
 833 }
 834 EXPORT_SYMBOL_GPL(iscsi_destroy_session);
 835
 836 /**
 837  * iscsi_create_conn - create iscsi class connection
 838  * @session: iscsi cls session
 839  * @dd_size: private driver data size
 840  * @cid: connection id
 841  *
 842  * This can be called from a LLD or iscsi_transport. The connection
 843  * is child of the session so cid must be unique for all connections
 844  * on the session.
 845  *
 846  * Since we do not support MCS, cid will normally be zero. In some cases
 847  * for software iscsi we could be trying to preallocate a connection struct
 848  * in which case there could be two connection structs and cid would be
 849  * non-zero.
 850  */
 851 struct iscsi_cls_conn *
 852 iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
 853 {
 854         struct iscsi_transport *transport = session->transport;
 855         struct iscsi_cls_conn *conn;
 856         unsigned long flags;
 857         int err;
 858
 859         conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
 860         if (!conn)
 861                 return NULL;
 862         if (dd_size)
 863                 conn->dd_data = &conn[1];
 864
 865         INIT_LIST_HEAD(&conn->conn_list);
 866         conn->transport = transport;
 867         conn->cid = cid;
 868
 869         /* this is released in the dev's release function */
 870         if (!get_device(&session->dev))
 871                 goto free_conn;
 872
 873         dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
 874         conn->dev.parent = &session->dev;
 875         conn->dev.release = iscsi_conn_release;
 876         err = device_register(&conn->dev);
 877         if (err) {
 878                 iscsi_cls_session_printk(KERN_ERR, session, "could not "
 879                                          "register connection's dev\n");
 880                 goto release_parent_ref;
 881         }
 882         transport_register_device(&conn->dev);
 883
 884         spin_lock_irqsave(&connlock, flags);
 885         list_add(&conn->conn_list, &connlist);
 886         conn->active = 1;
 887         spin_unlock_irqrestore(&connlock, flags);
 888         return conn;
 889
 890 release_parent_ref:
 891         put_device(&session->dev);
 892 free_conn:
 893         kfree(conn);
 894         return NULL;
 895 }
 896
 897 EXPORT_SYMBOL_GPL(iscsi_create_conn);
 898
 899 /**
 900  * iscsi_destroy_conn - destroy iscsi class connection
 901  * @conn: iscsi cls session
 902  *
 903  * This can be called from a LLD or iscsi_transport.
 904  */
 905 int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
 906 {
 907         unsigned long flags;
 908
 909         spin_lock_irqsave(&connlock, flags);
 910         conn->active = 0;
 911         list_del(&conn->conn_list);
 912         spin_unlock_irqrestore(&connlock, flags);
 913
 914         transport_unregister_device(&conn->dev);
 915         device_unregister(&conn->dev);
 916         return 0;
 917 }
 918 EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
 919
 920 /*
 921  * iscsi interface functions
 922  */
 923 static struct iscsi_internal *
 924 iscsi_if_transport_lookup(struct iscsi_transport *tt)
 925 {
 926         struct iscsi_internal *priv;
 927         unsigned long flags;
 928
 929         spin_lock_irqsave(&iscsi_transport_lock, flags);
 930         list_for_each_entry(priv, &iscsi_transports, list) {
 931                 if (tt == priv->iscsi_transport) {
 932                         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
 933                         return priv;
 934                 }
 935         }
 936         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
 937         return NULL;
 938 }
 939
 940 static int
 941 iscsi_broadcast_skb(struct sk_buff *skb, gfp_t gfp)
 942 {
 943         return netlink_broadcast(nls, skb, 0, 1, gfp);
 944 }
 945
 946 static int
 947 iscsi_unicast_skb(struct sk_buff *skb, int pid)
 948 {
 949         int rc;
 950
 951         rc = netlink_unicast(nls, skb, pid, MSG_DONTWAIT);
 952         if (rc < 0) {
 953                 printk(KERN_ERR "iscsi: can not unicast skb (%d)\n", rc);
 954                 return rc;
 955         }
 956
 957         return 0;
 958 }
 959
 960 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
 961                    char *data, uint32_t data_size)
 962 {
 963         struct nlmsghdr *nlh;
 964         struct sk_buff *skb;
 965         struct iscsi_uevent *ev;
 966         char *pdu;
 967         struct iscsi_internal *priv;
 968         int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) +
 969                               data_size);
 970
 971         priv = iscsi_if_transport_lookup(conn->transport);
 972         if (!priv)
 973                 return -EINVAL;
 974
 975         skb = alloc_skb(len, GFP_ATOMIC);
 976         if (!skb) {
 977                 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
 978                 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
 979                                       "control PDU: OOM\n");
 980                 return -ENOMEM;
 981         }
 982
 983         nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
 984         ev = NLMSG_DATA(nlh);
 985         memset(ev, 0, sizeof(*ev));
 986         ev->transport_handle = iscsi_handle(conn->transport);
 987         ev->type = ISCSI_KEVENT_RECV_PDU;
 988         ev->r.recv_req.cid = conn->cid;
 989         ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
 990         pdu = (char*)ev + sizeof(*ev);
 991         memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
 992         memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
 993
 994         return iscsi_unicast_skb(skb, priv->daemon_pid);
 995 }
 996 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
 997
 998 void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
 999 {
1000         struct nlmsghdr *nlh;
1001         struct sk_buff  *skb;
1002         struct iscsi_uevent *ev;
1003         struct iscsi_internal *priv;
1004         int len = NLMSG_SPACE(sizeof(*ev));
1005
1006         priv = iscsi_if_transport_lookup(conn->transport);
1007         if (!priv)
1008                 return;
1009
1010         skb = alloc_skb(len, GFP_ATOMIC);
1011         if (!skb) {
1012                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
1013                                       "conn error (%d)\n", error);
1014                 return;
1015         }
1016
1017         nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
1018         ev = NLMSG_DATA(nlh);
1019         ev->transport_handle = iscsi_handle(conn->transport);
1020         ev->type = ISCSI_KEVENT_CONN_ERROR;
1021         ev->r.connerror.error = error;
1022         ev->r.connerror.cid = conn->cid;
1023         ev->r.connerror.sid = iscsi_conn_get_sid(conn);
1024
1025         iscsi_broadcast_skb(skb, GFP_ATOMIC);
1026
1027         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
1028                               error);
1029 }
1030 EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
1031
1032 static int
1033 iscsi_if_send_reply(int pid, int seq, int type, int done, int multi,
1034                       void *payload, int size)
1035 {
1036         struct sk_buff  *skb;
1037         struct nlmsghdr *nlh;
1038         int len = NLMSG_SPACE(size);
1039         int flags = multi ? NLM_F_MULTI : 0;
1040         int t = done ? NLMSG_DONE : type;
1041
1042         skb = alloc_skb(len, GFP_ATOMIC);
1043         if (!skb) {
1044                 printk(KERN_ERR "Could not allocate skb to send reply.\n");
1045                 return -ENOMEM;
1046         }
1047
1048         nlh = __nlmsg_put(skb, pid, seq, t, (len - sizeof(*nlh)), 0);
1049         nlh->nlmsg_flags = flags;
1050         memcpy(NLMSG_DATA(nlh), payload, size);
1051         return iscsi_unicast_skb(skb, pid);
1052 }
1053
1054 static int
1055 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
1056 {
1057         struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1058         struct iscsi_stats *stats;
1059         struct sk_buff *skbstat;
1060         struct iscsi_cls_conn *conn;
1061         struct nlmsghdr *nlhstat;
1062         struct iscsi_uevent *evstat;
1063         struct iscsi_internal *priv;
1064         int len = NLMSG_SPACE(sizeof(*ev) +
1065                               sizeof(struct iscsi_stats) +
1066                               sizeof(struct iscsi_stats_custom) *
1067                               ISCSI_STATS_CUSTOM_MAX);
1068         int err = 0;
1069
1070         priv = iscsi_if_transport_lookup(transport);
1071         if (!priv)
1072                 return -EINVAL;
1073
1074         conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
1075         if (!conn)
1076                 return -EEXIST;
1077
1078         do {
1079                 int actual_size;
1080
1081                 skbstat = alloc_skb(len, GFP_ATOMIC);
1082                 if (!skbstat) {
1083                         iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
1084                                               "deliver stats: OOM\n");
1085                         return -ENOMEM;
1086                 }
1087
1088                 nlhstat = __nlmsg_put(skbstat, priv->daemon_pid, 0, 0,
1089                                       (len - sizeof(*nlhstat)), 0);
1090                 evstat = NLMSG_DATA(nlhstat);
1091                 memset(evstat, 0, sizeof(*evstat));
1092                 evstat->transport_handle = iscsi_handle(conn->transport);
1093                 evstat->type = nlh->nlmsg_type;
1094                 evstat->u.get_stats.cid =
1095                         ev->u.get_stats.cid;
1096                 evstat->u.get_stats.sid =
1097                         ev->u.get_stats.sid;
1098                 stats = (struct iscsi_stats *)
1099                         ((char*)evstat + sizeof(*evstat));
1100                 memset(stats, 0, sizeof(*stats));
1101
1102                 transport->get_stats(conn, stats);
1103                 actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) +
1104                                           sizeof(struct iscsi_stats) +
1105                                           sizeof(struct iscsi_stats_custom) *
1106                                           stats->custom_length);
1107                 actual_size -= sizeof(*nlhstat);
1108                 actual_size = NLMSG_LENGTH(actual_size);
1109                 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
1110                 nlhstat->nlmsg_len = actual_size;
1111
1112                 err = iscsi_unicast_skb(skbstat, priv->daemon_pid);
1113         } while (err < 0 && err != -ECONNREFUSED);
1114
1115         return err;
1116 }
1117
1118 /**
1119  * iscsi_session_event - send session destr. completion event
1120  * @session: iscsi class session
1121  * @event: type of event
1122  */
1123 int iscsi_session_event(struct iscsi_cls_session *session,
1124                         enum iscsi_uevent_e event)
1125 {
1126         struct iscsi_internal *priv;
1127         struct Scsi_Host *shost;
1128         struct iscsi_uevent *ev;
1129         struct sk_buff  *skb;
1130         struct nlmsghdr *nlh;
1131         int rc, len = NLMSG_SPACE(sizeof(*ev));
1132
1133         priv = iscsi_if_transport_lookup(session->transport);
1134         if (!priv)
1135                 return -EINVAL;
1136         shost = iscsi_session_to_shost(session);
1137
1138         skb = alloc_skb(len, GFP_KERNEL);
1139         if (!skb) {
1140                 iscsi_cls_session_printk(KERN_ERR, session,
1141                                          "Cannot notify userspace of session "
1142                                          "event %u\n", event);
1143                 return -ENOMEM;
1144         }
1145
1146         nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
1147         ev = NLMSG_DATA(nlh);
1148         ev->transport_handle = iscsi_handle(session->transport);
1149
1150         ev->type = event;
1151         switch (event) {
1152         case ISCSI_KEVENT_DESTROY_SESSION:
1153                 ev->r.d_session.host_no = shost->host_no;
1154                 ev->r.d_session.sid = session->sid;
1155                 break;
1156         case ISCSI_KEVENT_CREATE_SESSION:
1157                 ev->r.c_session_ret.host_no = shost->host_no;
1158                 ev->r.c_session_ret.sid = session->sid;
1159                 break;
1160         case ISCSI_KEVENT_UNBIND_SESSION:
1161                 ev->r.unbind_session.host_no = shost->host_no;
1162                 ev->r.unbind_session.sid = session->sid;
1163                 break;
1164         default:
1165                 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
1166                                          "%u.\n", event);
1167                 kfree_skb(skb);
1168                 return -EINVAL;
1169         }
1170
1171         /*
1172          * this will occur if the daemon is not up, so we just warn
1173          * the user and when the daemon is restarted it will handle it
1174          */
1175         rc = iscsi_broadcast_skb(skb, GFP_KERNEL);
1176         if (rc == -ESRCH)
1177                 iscsi_cls_session_printk(KERN_ERR, session,
1178                                          "Cannot notify userspace of session "
1179                                          "event %u. Check iscsi daemon\n",
1180                                          event);
1181         return rc;
1182 }
1183 EXPORT_SYMBOL_GPL(iscsi_session_event);
1184
1185 static int
1186 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
1187                         struct iscsi_uevent *ev, uint32_t initial_cmdsn,
1188                         uint16_t cmds_max, uint16_t queue_depth)
1189 {
1190         struct iscsi_transport *transport = priv->iscsi_transport;
1191         struct iscsi_cls_session *session;
1192         struct Scsi_Host *shost;
1193
1194         session = transport->create_session(ep, cmds_max, queue_depth,
1195                                             initial_cmdsn);
1196         if (!session)
1197                 return -ENOMEM;
1198
1199         shost = iscsi_session_to_shost(session);
1200         ev->r.c_session_ret.host_no = shost->host_no;
1201         ev->r.c_session_ret.sid = session->sid;
1202         return 0;
1203 }
1204
1205 static int
1206 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1207 {
1208         struct iscsi_cls_conn *conn;
1209         struct iscsi_cls_session *session;
1210
1211         session = iscsi_session_lookup(ev->u.c_conn.sid);
1212         if (!session) {
1213                 printk(KERN_ERR "iscsi: invalid session %d.\n",
1214                        ev->u.c_conn.sid);
1215                 return -EINVAL;
1216         }
1217
1218         conn = transport->create_conn(session, ev->u.c_conn.cid);
1219         if (!conn) {
1220                 iscsi_cls_session_printk(KERN_ERR, session,
1221                                          "couldn't create a new connection.");
1222                 return -ENOMEM;
1223         }
1224
1225         ev->r.c_conn_ret.sid = session->sid;
1226         ev->r.c_conn_ret.cid = conn->cid;
1227         return 0;
1228 }
1229
1230 static int
1231 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1232 {
1233         struct iscsi_cls_conn *conn;
1234
1235         conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
1236         if (!conn)
1237                 return -EINVAL;
1238
1239         if (transport->destroy_conn)
1240                 transport->destroy_conn(conn);
1241         return 0;
1242 }
1243
1244 static int
1245 iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1246 {
1247         char *data = (char*)ev + sizeof(*ev);
1248         struct iscsi_cls_conn *conn;
1249         struct iscsi_cls_session *session;
1250         int err = 0, value = 0;
1251
1252         session = iscsi_session_lookup(ev->u.set_param.sid);
1253         conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
1254         if (!conn || !session)
1255                 return -EINVAL;
1256
1257         switch (ev->u.set_param.param) {
1258         case ISCSI_PARAM_SESS_RECOVERY_TMO:
1259                 sscanf(data, "%d", &value);
1260                 if (value != 0)
1261                         session->recovery_tmo = value;
1262                 break;
1263         default:
1264                 err = transport->set_param(conn, ev->u.set_param.param,
1265                                            data, ev->u.set_param.len);
1266         }
1267
1268         return err;
1269 }
1270
1271 static int
1272 iscsi_if_transport_ep(struct iscsi_transport *transport,
1273                       struct iscsi_uevent *ev, int msg_type)
1274 {
1275         struct iscsi_endpoint *ep;
1276         struct sockaddr *dst_addr;
1277         int rc = 0;
1278
1279         switch (msg_type) {
1280         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1281                 if (!transport->ep_connect)
1282                         return -EINVAL;
1283
1284                 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1285                 ep = transport->ep_connect(dst_addr,
1286                                            ev->u.ep_connect.non_blocking);
1287                 if (IS_ERR(ep))
1288                         return PTR_ERR(ep);
1289
1290                 ev->r.ep_connect_ret.handle = ep->id;
1291                 break;
1292         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1293                 if (!transport->ep_poll)
1294                         return -EINVAL;
1295
1296                 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
1297                 if (!ep)
1298                         return -EINVAL;
1299
1300                 ev->r.retcode = transport->ep_poll(ep,
1301                                                    ev->u.ep_poll.timeout_ms);
1302                 break;
1303         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1304                 if (!transport->ep_disconnect)
1305                         return -EINVAL;
1306
1307                 ep = iscsi_lookup_endpoint(ev->u.ep_disconnect.ep_handle);
1308                 if (!ep)
1309                         return -EINVAL;
1310
1311                 transport->ep_disconnect(ep);
1312                 break;
1313         }
1314         return rc;
1315 }
1316
1317 static int
1318 iscsi_tgt_dscvr(struct iscsi_transport *transport,
1319                 struct iscsi_uevent *ev)
1320 {
1321         struct Scsi_Host *shost;
1322         struct sockaddr *dst_addr;
1323         int err;
1324
1325         if (!transport->tgt_dscvr)
1326                 return -EINVAL;
1327
1328         shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
1329         if (!shost) {
1330                 printk(KERN_ERR "target discovery could not find host no %u\n",
1331                        ev->u.tgt_dscvr.host_no);
1332                 return -ENODEV;
1333         }
1334
1335
1336         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1337         err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
1338                                    ev->u.tgt_dscvr.enable, dst_addr);
1339         scsi_host_put(shost);
1340         return err;
1341 }
1342
1343 static int
1344 iscsi_set_host_param(struct iscsi_transport *transport,
1345                      struct iscsi_uevent *ev)
1346 {
1347         char *data = (char*)ev + sizeof(*ev);
1348         struct Scsi_Host *shost;
1349         int err;
1350
1351         if (!transport->set_host_param)
1352                 return -ENOSYS;
1353
1354         shost = scsi_host_lookup(ev->u.set_host_param.host_no);
1355         if (!shost) {
1356                 printk(KERN_ERR "set_host_param could not find host no %u\n",
1357                        ev->u.set_host_param.host_no);
1358                 return -ENODEV;
1359         }
1360
1361         err = transport->set_host_param(shost, ev->u.set_host_param.param,
1362                                         data, ev->u.set_host_param.len);
1363         scsi_host_put(shost);
1364         return err;
1365 }
1366
1367 static int
1368 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1369 {
1370         int err = 0;
1371         struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1372         struct iscsi_transport *transport = NULL;
1373         struct iscsi_internal *priv;
1374         struct iscsi_cls_session *session;
1375         struct iscsi_cls_conn *conn;
1376         struct iscsi_endpoint *ep = NULL;
1377
1378         priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
1379         if (!priv)
1380                 return -EINVAL;
1381         transport = priv->iscsi_transport;
1382
1383         if (!try_module_get(transport->owner))
1384                 return -EINVAL;
1385
1386         priv->daemon_pid = NETLINK_CREDS(skb)->pid;
1387
1388         switch (nlh->nlmsg_type) {
1389         case ISCSI_UEVENT_CREATE_SESSION:
1390                 err = iscsi_if_create_session(priv, ep, ev,
1391                                               ev->u.c_session.initial_cmdsn,
1392                                               ev->u.c_session.cmds_max,
1393                                               ev->u.c_session.queue_depth);
1394                 break;
1395         case ISCSI_UEVENT_CREATE_BOUND_SESSION:
1396                 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
1397                 if (!ep) {
1398                         err = -EINVAL;
1399                         break;
1400                 }
1401
1402                 err = iscsi_if_create_session(priv, ep, ev,
1403                                         ev->u.c_bound_session.initial_cmdsn,
1404                                         ev->u.c_bound_session.cmds_max,
1405                                         ev->u.c_bound_session.queue_depth);
1406                 break;
1407         case ISCSI_UEVENT_DESTROY_SESSION:
1408                 session = iscsi_session_lookup(ev->u.d_session.sid);
1409                 if (session)
1410                         transport->destroy_session(session);
1411                 else
1412                         err = -EINVAL;
1413                 break;
1414         case ISCSI_UEVENT_UNBIND_SESSION:
1415                 session = iscsi_session_lookup(ev->u.d_session.sid);
1416                 if (session)
1417                         scsi_queue_work(iscsi_session_to_shost(session),
1418                                         &session->unbind_work);
1419                 else
1420                         err = -EINVAL;
1421                 break;
1422         case ISCSI_UEVENT_CREATE_CONN:
1423                 err = iscsi_if_create_conn(transport, ev);
1424                 break;
1425         case ISCSI_UEVENT_DESTROY_CONN:
1426                 err = iscsi_if_destroy_conn(transport, ev);
1427                 break;
1428         case ISCSI_UEVENT_BIND_CONN:
1429                 session = iscsi_session_lookup(ev->u.b_conn.sid);
1430                 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
1431
1432                 if (session && conn)
1433                         ev->r.retcode = transport->bind_conn(session, conn,
1434                                         ev->u.b_conn.transport_eph,
1435                                         ev->u.b_conn.is_leading);
1436                 else
1437                         err = -EINVAL;
1438                 break;
1439         case ISCSI_UEVENT_SET_PARAM:
1440                 err = iscsi_set_param(transport, ev);
1441                 break;
1442         case ISCSI_UEVENT_START_CONN:
1443                 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
1444                 if (conn)
1445                         ev->r.retcode = transport->start_conn(conn);
1446                 else
1447                         err = -EINVAL;
1448                 break;
1449         case ISCSI_UEVENT_STOP_CONN:
1450                 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
1451                 if (conn)
1452                         transport->stop_conn(conn, ev->u.stop_conn.flag);
1453                 else
1454                         err = -EINVAL;
1455                 break;
1456         case ISCSI_UEVENT_SEND_PDU:
1457                 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
1458                 if (conn)
1459                         ev->r.retcode = transport->send_pdu(conn,
1460                                 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
1461                                 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
1462                                 ev->u.send_pdu.data_size);
1463                 else
1464                         err = -EINVAL;
1465                 break;
1466         case ISCSI_UEVENT_GET_STATS:
1467                 err = iscsi_if_get_stats(transport, nlh);
1468                 break;
1469         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1470         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1471         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1472                 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
1473                 break;
1474         case ISCSI_UEVENT_TGT_DSCVR:
1475                 err = iscsi_tgt_dscvr(transport, ev);
1476                 break;
1477         case ISCSI_UEVENT_SET_HOST_PARAM:
1478                 err = iscsi_set_host_param(transport, ev);
1479                 break;
1480         default:
1481                 err = -ENOSYS;
1482                 break;
1483         }
1484
1485         module_put(transport->owner);
1486         return err;
1487 }
1488
1489 /*
1490  * Get message from skb.  Each message is processed by iscsi_if_recv_msg.
1491  * Malformed skbs with wrong lengths or invalid creds are not processed.
1492  */
1493 static void
1494 iscsi_if_rx(struct sk_buff *skb)
1495 {
1496         mutex_lock(&rx_queue_mutex);
1497         while (skb->len >= NLMSG_SPACE(0)) {
1498                 int err;
1499                 uint32_t rlen;
1500                 struct nlmsghdr *nlh;
1501                 struct iscsi_uevent *ev;
1502
1503                 nlh = nlmsg_hdr(skb);
1504                 if (nlh->nlmsg_len < sizeof(*nlh) ||
1505                     skb->len < nlh->nlmsg_len) {
1506                         break;
1507                 }
1508
1509                 ev = NLMSG_DATA(nlh);
1510                 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
1511                 if (rlen > skb->len)
1512                         rlen = skb->len;
1513
1514                 err = iscsi_if_recv_msg(skb, nlh);
1515                 if (err) {
1516                         ev->type = ISCSI_KEVENT_IF_ERROR;
1517                         ev->iferror = err;
1518                 }
1519                 do {
1520                         /*
1521                          * special case for GET_STATS:
1522                          * on success - sending reply and stats from
1523                          * inside of if_recv_msg(),
1524                          * on error - fall through.
1525                          */
1526                         if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
1527                                 break;
1528                         err = iscsi_if_send_reply(
1529                                 NETLINK_CREDS(skb)->pid, nlh->nlmsg_seq,
1530                                 nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
1531                 } while (err < 0 && err != -ECONNREFUSED);
1532                 skb_pull(skb, rlen);
1533         }
1534         mutex_unlock(&rx_queue_mutex);
1535 }
1536
1537 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store)              \
1538 struct device_attribute dev_attr_##_prefix##_##_name =  \
1539         __ATTR(_name,_mode,_show,_store)
1540
1541 /*
1542  * iSCSI connection attrs
1543  */
1544 #define iscsi_conn_attr_show(param)                                     \
1545 static ssize_t                                                          \
1546 show_conn_param_##param(struct device *dev,                             \
1547                         struct device_attribute *attr, char *buf)       \
1548 {                                                                       \
1549         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
1550         struct iscsi_transport *t = conn->transport;                    \
1551         return t->get_conn_param(conn, param, buf);                     \
1552 }
1553
1554 #define iscsi_conn_attr(field, param)                                   \
1555         iscsi_conn_attr_show(param)                                     \
1556 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param,  \
1557                         NULL);
1558
1559 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
1560 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
1561 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
1562 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
1563 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
1564 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
1565 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
1566 iscsi_conn_attr(port, ISCSI_PARAM_CONN_PORT);
1567 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
1568 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
1569 iscsi_conn_attr(address, ISCSI_PARAM_CONN_ADDRESS);
1570 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
1571 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
1572
1573 /*
1574  * iSCSI session attrs
1575  */
1576 #define iscsi_session_attr_show(param, perm)                            \
1577 static ssize_t                                                          \
1578 show_session_param_##param(struct device *dev,                          \
1579                            struct device_attribute *attr, char *buf)    \
1580 {                                                                       \
1581         struct iscsi_cls_session *session =                             \
1582                 iscsi_dev_to_session(dev->parent);                      \
1583         struct iscsi_transport *t = session->transport;                 \
1584                                                                         \
1585         if (perm && !capable(CAP_SYS_ADMIN))                            \
1586                 return -EACCES;                                         \
1587         return t->get_session_param(session, param, buf);               \
1588 }
1589
1590 #define iscsi_session_attr(field, param, perm)                          \
1591         iscsi_session_attr_show(param, perm)                            \
1592 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
1593                         NULL);
1594
1595 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
1596 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
1597 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
1598 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
1599 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
1600 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
1601 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
1602 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
1603 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
1604 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
1605 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
1606 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
1607 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
1608 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
1609 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
1610 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
1611 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
1612 iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
1613 iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0)
1614
1615 static ssize_t
1616 show_priv_session_state(struct device *dev, struct device_attribute *attr,
1617                         char *buf)
1618 {
1619         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
1620         return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
1621 }
1622 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
1623                         NULL);
1624
1625 #define iscsi_priv_session_attr_show(field, format)                     \
1626 static ssize_t                                                          \
1627 show_priv_session_##field(struct device *dev,                           \
1628                           struct device_attribute *attr, char *buf)     \
1629 {                                                                       \
1630         struct iscsi_cls_session *session =                             \
1631                         iscsi_dev_to_session(dev->parent);              \
1632         return sprintf(buf, format"\n", session->field);                \
1633 }
1634
1635 #define iscsi_priv_session_attr(field, format)                          \
1636         iscsi_priv_session_attr_show(field, format)                     \
1637 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO, show_priv_session_##field, \
1638                         NULL)
1639 iscsi_priv_session_attr(recovery_tmo, "%d");
1640
1641 /*
1642  * iSCSI host attrs
1643  */
1644 #define iscsi_host_attr_show(param)                                     \
1645 static ssize_t                                                          \
1646 show_host_param_##param(struct device *dev,                             \
1647                         struct device_attribute *attr, char *buf)       \
1648 {                                                                       \
1649         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1650         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
1651         return priv->iscsi_transport->get_host_param(shost, param, buf); \
1652 }
1653
1654 #define iscsi_host_attr(field, param)                                   \
1655         iscsi_host_attr_show(param)                                     \
1656 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param,  \
1657                         NULL);
1658
1659 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
1660 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
1661 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
1662 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
1663
1664 #define SETUP_PRIV_SESSION_RD_ATTR(field)                               \
1665 do {                                                                    \
1666         priv->session_attrs[count] = &dev_attr_priv_sess_##field; \
1667         count++;                                                        \
1668 } while (0)
1669
1670
1671 #define SETUP_SESSION_RD_ATTR(field, param_flag)                        \
1672 do {                                                                    \
1673         if (tt->param_mask & param_flag) {                              \
1674                 priv->session_attrs[count] = &dev_attr_sess_##field; \
1675                 count++;                                                \
1676         }                                                               \
1677 } while (0)
1678
1679 #define SETUP_CONN_RD_ATTR(field, param_flag)                           \
1680 do {                                                                    \
1681         if (tt->param_mask & param_flag) {                              \
1682                 priv->conn_attrs[count] = &dev_attr_conn_##field; \
1683                 count++;                                                \
1684         }                                                               \
1685 } while (0)
1686
1687 #define SETUP_HOST_RD_ATTR(field, param_flag)                           \
1688 do {                                                                    \
1689         if (tt->host_param_mask & param_flag) {                         \
1690                 priv->host_attrs[count] = &dev_attr_host_##field; \
1691                 count++;                                                \
1692         }                                                               \
1693 } while (0)
1694
1695 static int iscsi_session_match(struct attribute_container *cont,
1696                            struct device *dev)
1697 {
1698         struct iscsi_cls_session *session;
1699         struct Scsi_Host *shost;
1700         struct iscsi_internal *priv;
1701
1702         if (!iscsi_is_session_dev(dev))
1703                 return 0;
1704
1705         session = iscsi_dev_to_session(dev);
1706         shost = iscsi_session_to_shost(session);
1707         if (!shost->transportt)
1708                 return 0;
1709
1710         priv = to_iscsi_internal(shost->transportt);
1711         if (priv->session_cont.ac.class != &iscsi_session_class.class)
1712                 return 0;
1713
1714         return &priv->session_cont.ac == cont;
1715 }
1716
1717 static int iscsi_conn_match(struct attribute_container *cont,
1718                            struct device *dev)
1719 {
1720         struct iscsi_cls_session *session;
1721         struct iscsi_cls_conn *conn;
1722         struct Scsi_Host *shost;
1723         struct iscsi_internal *priv;
1724
1725         if (!iscsi_is_conn_dev(dev))
1726                 return 0;
1727
1728         conn = iscsi_dev_to_conn(dev);
1729         session = iscsi_dev_to_session(conn->dev.parent);
1730         shost = iscsi_session_to_shost(session);
1731
1732         if (!shost->transportt)
1733                 return 0;
1734
1735         priv = to_iscsi_internal(shost->transportt);
1736         if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
1737                 return 0;
1738
1739         return &priv->conn_cont.ac == cont;
1740 }
1741
1742 static int iscsi_host_match(struct attribute_container *cont,
1743                             struct device *dev)
1744 {
1745         struct Scsi_Host *shost;
1746         struct iscsi_internal *priv;
1747
1748         if (!scsi_is_host_device(dev))
1749                 return 0;
1750
1751         shost = dev_to_shost(dev);
1752         if (!shost->transportt  ||
1753             shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
1754                 return 0;
1755
1756         priv = to_iscsi_internal(shost->transportt);
1757         return &priv->t.host_attrs.ac == cont;
1758 }
1759
1760 struct scsi_transport_template *
1761 iscsi_register_transport(struct iscsi_transport *tt)
1762 {
1763         struct iscsi_internal *priv;
1764         unsigned long flags;
1765         int count = 0, err;
1766
1767         BUG_ON(!tt);
1768
1769         priv = iscsi_if_transport_lookup(tt);
1770         if (priv)
1771                 return NULL;
1772
1773         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1774         if (!priv)
1775                 return NULL;
1776         INIT_LIST_HEAD(&priv->list);
1777         priv->daemon_pid = -1;
1778         priv->iscsi_transport = tt;
1779         priv->t.user_scan = iscsi_user_scan;
1780         priv->t.create_work_queue = 1;
1781
1782         priv->dev.class = &iscsi_transport_class;
1783         dev_set_name(&priv->dev, "%s", tt->name);
1784         err = device_register(&priv->dev);
1785         if (err)
1786                 goto free_priv;
1787
1788         err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
1789         if (err)
1790                 goto unregister_dev;
1791
1792         /* host parameters */
1793         priv->t.host_attrs.ac.attrs = &priv->host_attrs[0];
1794         priv->t.host_attrs.ac.class = &iscsi_host_class.class;
1795         priv->t.host_attrs.ac.match = iscsi_host_match;
1796         priv->t.host_size = sizeof(struct iscsi_cls_host);
1797         transport_container_register(&priv->t.host_attrs);
1798
1799         SETUP_HOST_RD_ATTR(netdev, ISCSI_HOST_NETDEV_NAME);
1800         SETUP_HOST_RD_ATTR(ipaddress, ISCSI_HOST_IPADDRESS);
1801         SETUP_HOST_RD_ATTR(hwaddress, ISCSI_HOST_HWADDRESS);
1802         SETUP_HOST_RD_ATTR(initiatorname, ISCSI_HOST_INITIATOR_NAME);
1803         BUG_ON(count > ISCSI_HOST_ATTRS);
1804         priv->host_attrs[count] = NULL;
1805         count = 0;
1806
1807         /* connection parameters */
1808         priv->conn_cont.ac.attrs = &priv->conn_attrs[0];
1809         priv->conn_cont.ac.class = &iscsi_connection_class.class;
1810         priv->conn_cont.ac.match = iscsi_conn_match;
1811         transport_container_register(&priv->conn_cont);
1812
1813         SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_MAX_RECV_DLENGTH);
1814         SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_MAX_XMIT_DLENGTH);
1815         SETUP_CONN_RD_ATTR(header_digest, ISCSI_HDRDGST_EN);
1816         SETUP_CONN_RD_ATTR(data_digest, ISCSI_DATADGST_EN);
1817         SETUP_CONN_RD_ATTR(ifmarker, ISCSI_IFMARKER_EN);
1818         SETUP_CONN_RD_ATTR(ofmarker, ISCSI_OFMARKER_EN);
1819         SETUP_CONN_RD_ATTR(address, ISCSI_CONN_ADDRESS);
1820         SETUP_CONN_RD_ATTR(port, ISCSI_CONN_PORT);
1821         SETUP_CONN_RD_ATTR(exp_statsn, ISCSI_EXP_STATSN);
1822         SETUP_CONN_RD_ATTR(persistent_address, ISCSI_PERSISTENT_ADDRESS);
1823         SETUP_CONN_RD_ATTR(persistent_port, ISCSI_PERSISTENT_PORT);
1824         SETUP_CONN_RD_ATTR(ping_tmo, ISCSI_PING_TMO);
1825         SETUP_CONN_RD_ATTR(recv_tmo, ISCSI_RECV_TMO);
1826
1827         BUG_ON(count > ISCSI_CONN_ATTRS);
1828         priv->conn_attrs[count] = NULL;
1829         count = 0;
1830
1831         /* session parameters */
1832         priv->session_cont.ac.attrs = &priv->session_attrs[0];
1833         priv->session_cont.ac.class = &iscsi_session_class.class;
1834         priv->session_cont.ac.match = iscsi_session_match;
1835         transport_container_register(&priv->session_cont);
1836
1837         SETUP_SESSION_RD_ATTR(initial_r2t, ISCSI_INITIAL_R2T_EN);
1838         SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_MAX_R2T);
1839         SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_IMM_DATA_EN);
1840         SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_FIRST_BURST);
1841         SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_MAX_BURST);
1842         SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PDU_INORDER_EN);
1843         SETUP_SESSION_RD_ATTR(data_seq_in_order, ISCSI_DATASEQ_INORDER_EN);
1844         SETUP_SESSION_RD_ATTR(erl, ISCSI_ERL);
1845         SETUP_SESSION_RD_ATTR(targetname, ISCSI_TARGET_NAME);
1846         SETUP_SESSION_RD_ATTR(tpgt, ISCSI_TPGT);
1847         SETUP_SESSION_RD_ATTR(password, ISCSI_USERNAME);
1848         SETUP_SESSION_RD_ATTR(password_in, ISCSI_USERNAME_IN);
1849         SETUP_SESSION_RD_ATTR(username, ISCSI_PASSWORD);
1850         SETUP_SESSION_RD_ATTR(username_in, ISCSI_PASSWORD_IN);
1851         SETUP_SESSION_RD_ATTR(fast_abort, ISCSI_FAST_ABORT);
1852         SETUP_SESSION_RD_ATTR(abort_tmo, ISCSI_ABORT_TMO);
1853         SETUP_SESSION_RD_ATTR(lu_reset_tmo,ISCSI_LU_RESET_TMO);
1854         SETUP_SESSION_RD_ATTR(ifacename, ISCSI_IFACE_NAME);
1855         SETUP_SESSION_RD_ATTR(initiatorname, ISCSI_INITIATOR_NAME);
1856         SETUP_PRIV_SESSION_RD_ATTR(recovery_tmo);
1857         SETUP_PRIV_SESSION_RD_ATTR(state);
1858
1859         BUG_ON(count > ISCSI_SESSION_ATTRS);
1860         priv->session_attrs[count] = NULL;
1861
1862         spin_lock_irqsave(&iscsi_transport_lock, flags);
1863         list_add(&priv->list, &iscsi_transports);
1864         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1865
1866         printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
1867         return &priv->t;
1868
1869 unregister_dev:
1870         device_unregister(&priv->dev);
1871         return NULL;
1872 free_priv:
1873         kfree(priv);
1874         return NULL;
1875 }
1876 EXPORT_SYMBOL_GPL(iscsi_register_transport);
1877
1878 int iscsi_unregister_transport(struct iscsi_transport *tt)
1879 {
1880         struct iscsi_internal *priv;
1881         unsigned long flags;
1882
1883         BUG_ON(!tt);
1884
1885         mutex_lock(&rx_queue_mutex);
1886
1887         priv = iscsi_if_transport_lookup(tt);
1888         BUG_ON (!priv);
1889
1890         spin_lock_irqsave(&iscsi_transport_lock, flags);
1891         list_del(&priv->list);
1892         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1893
1894         transport_container_unregister(&priv->conn_cont);
1895         transport_container_unregister(&priv->session_cont);
1896         transport_container_unregister(&priv->t.host_attrs);
1897
1898         sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
1899         device_unregister(&priv->dev);
1900         mutex_unlock(&rx_queue_mutex);
1901
1902         return 0;
1903 }
1904 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
1905
1906 static __init int iscsi_transport_init(void)
1907 {
1908         int err;
1909
1910         printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
1911                 ISCSI_TRANSPORT_VERSION);
1912
1913         atomic_set(&iscsi_session_nr, 0);
1914
1915         err = class_register(&iscsi_transport_class);
1916         if (err)
1917                 return err;
1918
1919         err = class_register(&iscsi_endpoint_class);
1920         if (err)
1921                 goto unregister_transport_class;
1922
1923         err = transport_class_register(&iscsi_host_class);
1924         if (err)
1925                 goto unregister_endpoint_class;
1926
1927         err = transport_class_register(&iscsi_connection_class);
1928         if (err)
1929                 goto unregister_host_class;
1930
1931         err = transport_class_register(&iscsi_session_class);
1932         if (err)
1933                 goto unregister_conn_class;
1934
1935         nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, 1, iscsi_if_rx,
1936                                     NULL, THIS_MODULE);
1937         if (!nls) {
1938                 err = -ENOBUFS;
1939                 goto unregister_session_class;
1940         }
1941
1942         iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
1943         if (!iscsi_eh_timer_workq)
1944                 goto release_nls;
1945
1946         return 0;
1947
1948 release_nls:
1949         netlink_kernel_release(nls);
1950 unregister_session_class:
1951         transport_class_unregister(&iscsi_session_class);
1952 unregister_conn_class:
1953         transport_class_unregister(&iscsi_connection_class);
1954 unregister_host_class:
1955         transport_class_unregister(&iscsi_host_class);
1956 unregister_endpoint_class:
1957         class_unregister(&iscsi_endpoint_class);
1958 unregister_transport_class:
1959         class_unregister(&iscsi_transport_class);
1960         return err;
1961 }
1962
1963 static void __exit iscsi_transport_exit(void)
1964 {
1965         destroy_workqueue(iscsi_eh_timer_workq);
1966         netlink_kernel_release(nls);
1967         transport_class_unregister(&iscsi_connection_class);
1968         transport_class_unregister(&iscsi_session_class);
1969         transport_class_unregister(&iscsi_host_class);
1970         class_unregister(&iscsi_endpoint_class);
1971         class_unregister(&iscsi_transport_class);
1972 }
1973
1974 module_init(iscsi_transport_init);
1975 module_exit(iscsi_transport_exit);
1976
1977 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
1978               "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
1979               "Alex Aizman <itn780@yahoo.com>");
1980 MODULE_DESCRIPTION("iSCSI Transport Interface");
1981 MODULE_LICENSE("GPL");
1982 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);