[SCSI] iscsi class: Add session initiatorname and ifacename sysfs attrs.
[linux-2.6.git] / 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 "2.0-869"
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, "%u\n", 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         unsigned int *epid = (unsigned int *) 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         unsigned int id;
170         int err;
171
172         for (id = 1; id < ISCSI_MAX_EPID; id++) {
173                 dev = class_find_device(&iscsi_endpoint_class, &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         snprintf(ep->dev.bus_id, BUS_ID_SIZE, "ep-%u", 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 device *dev;
223
224         dev = class_find_device(&iscsi_endpoint_class, &handle,
225                                 iscsi_match_epid);
226         if (!dev)
227                 return NULL;
228
229         return iscsi_dev_to_endpoint(dev);
230 }
231 EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
232
233 static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
234                             struct device *cdev)
235 {
236         struct Scsi_Host *shost = dev_to_shost(dev);
237         struct iscsi_cls_host *ihost = shost->shost_data;
238
239         memset(ihost, 0, sizeof(*ihost));
240         atomic_set(&ihost->nr_scans, 0);
241         mutex_init(&ihost->mutex);
242
243         snprintf(ihost->scan_workq_name, KOBJ_NAME_LEN, "iscsi_scan_%d",
244                 shost->host_no);
245         ihost->scan_workq = create_singlethread_workqueue(
246                                                 ihost->scan_workq_name);
247         if (!ihost->scan_workq)
248                 return -ENOMEM;
249         return 0;
250 }
251
252 static int iscsi_remove_host(struct transport_container *tc, struct device *dev,
253                              struct device *cdev)
254 {
255         struct Scsi_Host *shost = dev_to_shost(dev);
256         struct iscsi_cls_host *ihost = shost->shost_data;
257
258         destroy_workqueue(ihost->scan_workq);
259         return 0;
260 }
261
262 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
263                                "iscsi_host",
264                                iscsi_setup_host,
265                                iscsi_remove_host,
266                                NULL);
267
268 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
269                                "iscsi_session",
270                                NULL,
271                                NULL,
272                                NULL);
273
274 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
275                                "iscsi_connection",
276                                NULL,
277                                NULL,
278                                NULL);
279
280 static struct sock *nls;
281 static DEFINE_MUTEX(rx_queue_mutex);
282
283 static LIST_HEAD(sesslist);
284 static DEFINE_SPINLOCK(sesslock);
285 static LIST_HEAD(connlist);
286 static DEFINE_SPINLOCK(connlock);
287
288 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
289 {
290         struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
291         return sess->sid;
292 }
293
294 /*
295  * Returns the matching session to a given sid
296  */
297 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
298 {
299         unsigned long flags;
300         struct iscsi_cls_session *sess;
301
302         spin_lock_irqsave(&sesslock, flags);
303         list_for_each_entry(sess, &sesslist, sess_list) {
304                 if (sess->sid == sid) {
305                         spin_unlock_irqrestore(&sesslock, flags);
306                         return sess;
307                 }
308         }
309         spin_unlock_irqrestore(&sesslock, flags);
310         return NULL;
311 }
312
313 /*
314  * Returns the matching connection to a given sid / cid tuple
315  */
316 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
317 {
318         unsigned long flags;
319         struct iscsi_cls_conn *conn;
320
321         spin_lock_irqsave(&connlock, flags);
322         list_for_each_entry(conn, &connlist, conn_list) {
323                 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
324                         spin_unlock_irqrestore(&connlock, flags);
325                         return conn;
326                 }
327         }
328         spin_unlock_irqrestore(&connlock, flags);
329         return NULL;
330 }
331
332 /*
333  * The following functions can be used by LLDs that allocate
334  * their own scsi_hosts or by software iscsi LLDs
335  */
336 static struct {
337         int value;
338         char *name;
339 } iscsi_session_state_names[] = {
340         { ISCSI_SESSION_LOGGED_IN,      "LOGGED_IN" },
341         { ISCSI_SESSION_FAILED,         "FAILED" },
342         { ISCSI_SESSION_FREE,           "FREE" },
343 };
344
345 static const char *iscsi_session_state_name(int state)
346 {
347         int i;
348         char *name = NULL;
349
350         for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
351                 if (iscsi_session_state_names[i].value == state) {
352                         name = iscsi_session_state_names[i].name;
353                         break;
354                 }
355         }
356         return name;
357 }
358
359 int iscsi_session_chkready(struct iscsi_cls_session *session)
360 {
361         unsigned long flags;
362         int err;
363
364         spin_lock_irqsave(&session->lock, flags);
365         switch (session->state) {
366         case ISCSI_SESSION_LOGGED_IN:
367                 err = 0;
368                 break;
369         case ISCSI_SESSION_FAILED:
370                 err = DID_IMM_RETRY << 16;
371                 break;
372         case ISCSI_SESSION_FREE:
373                 err = DID_NO_CONNECT << 16;
374                 break;
375         default:
376                 err = DID_NO_CONNECT << 16;
377                 break;
378         }
379         spin_unlock_irqrestore(&session->lock, flags);
380         return err;
381 }
382 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
383
384 static void iscsi_session_release(struct device *dev)
385 {
386         struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
387         struct Scsi_Host *shost;
388
389         shost = iscsi_session_to_shost(session);
390         scsi_host_put(shost);
391         kfree(session);
392 }
393
394 static int iscsi_is_session_dev(const struct device *dev)
395 {
396         return dev->release == iscsi_session_release;
397 }
398
399 static int iscsi_iter_session_fn(struct device *dev, void *data)
400 {
401         void (* fn) (struct iscsi_cls_session *) = data;
402
403         if (!iscsi_is_session_dev(dev))
404                 return 0;
405         fn(iscsi_dev_to_session(dev));
406         return 0;
407 }
408
409 void iscsi_host_for_each_session(struct Scsi_Host *shost,
410                                  void (*fn)(struct iscsi_cls_session *))
411 {
412         device_for_each_child(&shost->shost_gendev, fn,
413                               iscsi_iter_session_fn);
414 }
415 EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
416
417 /**
418  * iscsi_scan_finished - helper to report when running scans are done
419  * @shost: scsi host
420  * @time: scan run time
421  *
422  * This function can be used by drives like qla4xxx to report to the scsi
423  * layer when the scans it kicked off at module load time are done.
424  */
425 int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
426 {
427         struct iscsi_cls_host *ihost = shost->shost_data;
428         /*
429          * qla4xxx will have kicked off some session unblocks before calling
430          * scsi_scan_host, so just wait for them to complete.
431          */
432         return !atomic_read(&ihost->nr_scans);
433 }
434 EXPORT_SYMBOL_GPL(iscsi_scan_finished);
435
436 struct iscsi_scan_data {
437         unsigned int channel;
438         unsigned int id;
439         unsigned int lun;
440 };
441
442 static int iscsi_user_scan_session(struct device *dev, void *data)
443 {
444         struct iscsi_scan_data *scan_data = data;
445         struct iscsi_cls_session *session;
446         struct Scsi_Host *shost;
447         struct iscsi_cls_host *ihost;
448         unsigned long flags;
449         unsigned int id;
450
451         if (!iscsi_is_session_dev(dev))
452                 return 0;
453
454         session = iscsi_dev_to_session(dev);
455         shost = iscsi_session_to_shost(session);
456         ihost = shost->shost_data;
457
458         mutex_lock(&ihost->mutex);
459         spin_lock_irqsave(&session->lock, flags);
460         if (session->state != ISCSI_SESSION_LOGGED_IN) {
461                 spin_unlock_irqrestore(&session->lock, flags);
462                 mutex_unlock(&ihost->mutex);
463                 return 0;
464         }
465         id = session->target_id;
466         spin_unlock_irqrestore(&session->lock, flags);
467
468         if (id != ISCSI_MAX_TARGET) {
469                 if ((scan_data->channel == SCAN_WILD_CARD ||
470                      scan_data->channel == 0) &&
471                     (scan_data->id == SCAN_WILD_CARD ||
472                      scan_data->id == id))
473                         scsi_scan_target(&session->dev, 0, id,
474                                          scan_data->lun, 1);
475         }
476         mutex_unlock(&ihost->mutex);
477         return 0;
478 }
479
480 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
481                            uint id, uint lun)
482 {
483         struct iscsi_scan_data scan_data;
484
485         scan_data.channel = channel;
486         scan_data.id = id;
487         scan_data.lun = lun;
488
489         return device_for_each_child(&shost->shost_gendev, &scan_data,
490                                      iscsi_user_scan_session);
491 }
492
493 static void iscsi_scan_session(struct work_struct *work)
494 {
495         struct iscsi_cls_session *session =
496                         container_of(work, struct iscsi_cls_session, scan_work);
497         struct Scsi_Host *shost = iscsi_session_to_shost(session);
498         struct iscsi_cls_host *ihost = shost->shost_data;
499         struct iscsi_scan_data scan_data;
500
501         scan_data.channel = 0;
502         scan_data.id = SCAN_WILD_CARD;
503         scan_data.lun = SCAN_WILD_CARD;
504
505         iscsi_user_scan_session(&session->dev, &scan_data);
506         atomic_dec(&ihost->nr_scans);
507 }
508
509 static void session_recovery_timedout(struct work_struct *work)
510 {
511         struct iscsi_cls_session *session =
512                 container_of(work, struct iscsi_cls_session,
513                              recovery_work.work);
514         unsigned long flags;
515
516         iscsi_cls_session_printk(KERN_INFO, session,
517                                  "session recovery timed out after %d secs\n",
518                                  session->recovery_tmo);
519
520         spin_lock_irqsave(&session->lock, flags);
521         switch (session->state) {
522         case ISCSI_SESSION_FAILED:
523                 session->state = ISCSI_SESSION_FREE;
524                 break;
525         case ISCSI_SESSION_LOGGED_IN:
526         case ISCSI_SESSION_FREE:
527                 /* we raced with the unblock's flush */
528                 spin_unlock_irqrestore(&session->lock, flags);
529                 return;
530         }
531         spin_unlock_irqrestore(&session->lock, flags);
532
533         if (session->transport->session_recovery_timedout)
534                 session->transport->session_recovery_timedout(session);
535
536         scsi_target_unblock(&session->dev);
537 }
538
539 static void __iscsi_unblock_session(struct work_struct *work)
540 {
541         struct iscsi_cls_session *session =
542                         container_of(work, struct iscsi_cls_session,
543                                      unblock_work);
544         struct Scsi_Host *shost = iscsi_session_to_shost(session);
545         struct iscsi_cls_host *ihost = shost->shost_data;
546         unsigned long flags;
547
548         /*
549          * The recovery and unblock work get run from the same workqueue,
550          * so try to cancel it if it was going to run after this unblock.
551          */
552         cancel_delayed_work(&session->recovery_work);
553         spin_lock_irqsave(&session->lock, flags);
554         session->state = ISCSI_SESSION_LOGGED_IN;
555         spin_unlock_irqrestore(&session->lock, flags);
556         /* start IO */
557         scsi_target_unblock(&session->dev);
558         /*
559          * Only do kernel scanning if the driver is properly hooked into
560          * the async scanning code (drivers like iscsi_tcp do login and
561          * scanning from userspace).
562          */
563         if (shost->hostt->scan_finished) {
564                 if (queue_work(ihost->scan_workq, &session->scan_work))
565                         atomic_inc(&ihost->nr_scans);
566         }
567 }
568
569 /**
570  * iscsi_unblock_session - set a session as logged in and start IO.
571  * @session: iscsi session
572  *
573  * Mark a session as ready to accept IO.
574  */
575 void iscsi_unblock_session(struct iscsi_cls_session *session)
576 {
577         queue_work(iscsi_eh_timer_workq, &session->unblock_work);
578         /*
579          * make sure all the events have completed before tell the driver
580          * it is safe
581          */
582         flush_workqueue(iscsi_eh_timer_workq);
583 }
584 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
585
586 static void __iscsi_block_session(struct work_struct *work)
587 {
588         struct iscsi_cls_session *session =
589                         container_of(work, struct iscsi_cls_session,
590                                      block_work);
591         unsigned long flags;
592
593         spin_lock_irqsave(&session->lock, flags);
594         session->state = ISCSI_SESSION_FAILED;
595         spin_unlock_irqrestore(&session->lock, flags);
596         scsi_target_block(&session->dev);
597         queue_delayed_work(iscsi_eh_timer_workq, &session->recovery_work,
598                            session->recovery_tmo * HZ);
599 }
600
601 void iscsi_block_session(struct iscsi_cls_session *session)
602 {
603         queue_work(iscsi_eh_timer_workq, &session->block_work);
604 }
605 EXPORT_SYMBOL_GPL(iscsi_block_session);
606
607 static void __iscsi_unbind_session(struct work_struct *work)
608 {
609         struct iscsi_cls_session *session =
610                         container_of(work, struct iscsi_cls_session,
611                                      unbind_work);
612         struct Scsi_Host *shost = iscsi_session_to_shost(session);
613         struct iscsi_cls_host *ihost = shost->shost_data;
614         unsigned long flags;
615
616         /* Prevent new scans and make sure scanning is not in progress */
617         mutex_lock(&ihost->mutex);
618         spin_lock_irqsave(&session->lock, flags);
619         if (session->target_id == ISCSI_MAX_TARGET) {
620                 spin_unlock_irqrestore(&session->lock, flags);
621                 mutex_unlock(&ihost->mutex);
622                 return;
623         }
624         session->target_id = ISCSI_MAX_TARGET;
625         spin_unlock_irqrestore(&session->lock, flags);
626         mutex_unlock(&ihost->mutex);
627
628         scsi_remove_target(&session->dev);
629         iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
630 }
631
632 static int iscsi_unbind_session(struct iscsi_cls_session *session)
633 {
634         struct Scsi_Host *shost = iscsi_session_to_shost(session);
635         struct iscsi_cls_host *ihost = shost->shost_data;
636
637         return queue_work(ihost->scan_workq, &session->unbind_work);
638 }
639
640 struct iscsi_cls_session *
641 iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
642                     int dd_size)
643 {
644         struct iscsi_cls_session *session;
645
646         session = kzalloc(sizeof(*session) + dd_size,
647                           GFP_KERNEL);
648         if (!session)
649                 return NULL;
650
651         session->transport = transport;
652         session->recovery_tmo = 120;
653         session->state = ISCSI_SESSION_FREE;
654         INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
655         INIT_LIST_HEAD(&session->sess_list);
656         INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
657         INIT_WORK(&session->block_work, __iscsi_block_session);
658         INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
659         INIT_WORK(&session->scan_work, iscsi_scan_session);
660         spin_lock_init(&session->lock);
661
662         /* this is released in the dev's release function */
663         scsi_host_get(shost);
664         session->dev.parent = &shost->shost_gendev;
665         session->dev.release = iscsi_session_release;
666         device_initialize(&session->dev);
667         if (dd_size)
668                 session->dd_data = &session[1];
669         return session;
670 }
671 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
672
673 static int iscsi_get_next_target_id(struct device *dev, void *data)
674 {
675         struct iscsi_cls_session *session;
676         unsigned long flags;
677         int err = 0;
678
679         if (!iscsi_is_session_dev(dev))
680                 return 0;
681
682         session = iscsi_dev_to_session(dev);
683         spin_lock_irqsave(&session->lock, flags);
684         if (*((unsigned int *) data) == session->target_id)
685                 err = -EEXIST;
686         spin_unlock_irqrestore(&session->lock, flags);
687         return err;
688 }
689
690 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
691 {
692         struct Scsi_Host *shost = iscsi_session_to_shost(session);
693         struct iscsi_cls_host *ihost;
694         unsigned long flags;
695         unsigned int id = target_id;
696         int err;
697
698         ihost = shost->shost_data;
699         session->sid = atomic_add_return(1, &iscsi_session_nr);
700
701         if (id == ISCSI_MAX_TARGET) {
702                 for (id = 0; id < ISCSI_MAX_TARGET; id++) {
703                         err = device_for_each_child(&shost->shost_gendev, &id,
704                                                     iscsi_get_next_target_id);
705                         if (!err)
706                                 break;
707                 }
708
709                 if (id == ISCSI_MAX_TARGET) {
710                         iscsi_cls_session_printk(KERN_ERR, session,
711                                                  "Too many iscsi targets. Max "
712                                                  "number of targets is %d.\n",
713                                                  ISCSI_MAX_TARGET - 1);
714                         goto release_host;
715                 }
716         }
717         session->target_id = id;
718
719         snprintf(session->dev.bus_id, BUS_ID_SIZE, "session%u",
720                  session->sid);
721         err = device_add(&session->dev);
722         if (err) {
723                 iscsi_cls_session_printk(KERN_ERR, session,
724                                          "could not register session's dev\n");
725                 goto release_host;
726         }
727         transport_register_device(&session->dev);
728
729         spin_lock_irqsave(&sesslock, flags);
730         list_add(&session->sess_list, &sesslist);
731         spin_unlock_irqrestore(&sesslock, flags);
732
733         iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
734         return 0;
735
736 release_host:
737         scsi_host_put(shost);
738         return err;
739 }
740 EXPORT_SYMBOL_GPL(iscsi_add_session);
741
742 /**
743  * iscsi_create_session - create iscsi class session
744  * @shost: scsi host
745  * @transport: iscsi transport
746  * @dd_size: private driver data size
747  * @target_id: which target
748  *
749  * This can be called from a LLD or iscsi_transport.
750  */
751 struct iscsi_cls_session *
752 iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
753                      int dd_size, unsigned int target_id)
754 {
755         struct iscsi_cls_session *session;
756
757         session = iscsi_alloc_session(shost, transport, dd_size);
758         if (!session)
759                 return NULL;
760
761         if (iscsi_add_session(session, target_id)) {
762                 iscsi_free_session(session);
763                 return NULL;
764         }
765         return session;
766 }
767 EXPORT_SYMBOL_GPL(iscsi_create_session);
768
769 static void iscsi_conn_release(struct device *dev)
770 {
771         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
772         struct device *parent = conn->dev.parent;
773
774         kfree(conn);
775         put_device(parent);
776 }
777
778 static int iscsi_is_conn_dev(const struct device *dev)
779 {
780         return dev->release == iscsi_conn_release;
781 }
782
783 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
784 {
785         if (!iscsi_is_conn_dev(dev))
786                 return 0;
787         return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
788 }
789
790 void iscsi_remove_session(struct iscsi_cls_session *session)
791 {
792         struct Scsi_Host *shost = iscsi_session_to_shost(session);
793         struct iscsi_cls_host *ihost = shost->shost_data;
794         unsigned long flags;
795         int err;
796
797         spin_lock_irqsave(&sesslock, flags);
798         list_del(&session->sess_list);
799         spin_unlock_irqrestore(&sesslock, flags);
800
801         /* make sure there are no blocks/unblocks queued */
802         flush_workqueue(iscsi_eh_timer_workq);
803         /* make sure the timedout callout is not running */
804         if (!cancel_delayed_work(&session->recovery_work))
805                 flush_workqueue(iscsi_eh_timer_workq);
806         /*
807          * If we are blocked let commands flow again. The lld or iscsi
808          * layer should set up the queuecommand to fail commands.
809          * We assume that LLD will not be calling block/unblock while
810          * removing the session.
811          */
812         spin_lock_irqsave(&session->lock, flags);
813         session->state = ISCSI_SESSION_FREE;
814         spin_unlock_irqrestore(&session->lock, flags);
815
816         scsi_target_unblock(&session->dev);
817         /* flush running scans then delete devices */
818         flush_workqueue(ihost->scan_workq);
819         __iscsi_unbind_session(&session->unbind_work);
820
821         /* hw iscsi may not have removed all connections from session */
822         err = device_for_each_child(&session->dev, NULL,
823                                     iscsi_iter_destroy_conn_fn);
824         if (err)
825                 iscsi_cls_session_printk(KERN_ERR, session,
826                                          "Could not delete all connections "
827                                          "for session. Error %d.\n", err);
828
829         transport_unregister_device(&session->dev);
830         device_del(&session->dev);
831 }
832 EXPORT_SYMBOL_GPL(iscsi_remove_session);
833
834 void iscsi_free_session(struct iscsi_cls_session *session)
835 {
836         iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
837         put_device(&session->dev);
838 }
839 EXPORT_SYMBOL_GPL(iscsi_free_session);
840
841 /**
842  * iscsi_destroy_session - destroy iscsi session
843  * @session: iscsi_session
844  *
845  * Can be called by a LLD or iscsi_transport. There must not be
846  * any running connections.
847  */
848 int iscsi_destroy_session(struct iscsi_cls_session *session)
849 {
850         iscsi_remove_session(session);
851         iscsi_free_session(session);
852         return 0;
853 }
854 EXPORT_SYMBOL_GPL(iscsi_destroy_session);
855
856 /**
857  * iscsi_create_conn - create iscsi class connection
858  * @session: iscsi cls session
859  * @dd_size: private driver data size
860  * @cid: connection id
861  *
862  * This can be called from a LLD or iscsi_transport. The connection
863  * is child of the session so cid must be unique for all connections
864  * on the session.
865  *
866  * Since we do not support MCS, cid will normally be zero. In some cases
867  * for software iscsi we could be trying to preallocate a connection struct
868  * in which case there could be two connection structs and cid would be
869  * non-zero.
870  */
871 struct iscsi_cls_conn *
872 iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
873 {
874         struct iscsi_transport *transport = session->transport;
875         struct iscsi_cls_conn *conn;
876         unsigned long flags;
877         int err;
878
879         conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
880         if (!conn)
881                 return NULL;
882         if (dd_size)
883                 conn->dd_data = &conn[1];
884
885         INIT_LIST_HEAD(&conn->conn_list);
886         conn->transport = transport;
887         conn->cid = cid;
888
889         /* this is released in the dev's release function */
890         if (!get_device(&session->dev))
891                 goto free_conn;
892
893         snprintf(conn->dev.bus_id, BUS_ID_SIZE, "connection%d:%u",
894                  session->sid, cid);
895         conn->dev.parent = &session->dev;
896         conn->dev.release = iscsi_conn_release;
897         err = device_register(&conn->dev);
898         if (err) {
899                 iscsi_cls_session_printk(KERN_ERR, session, "could not "
900                                          "register connection's dev\n");
901                 goto release_parent_ref;
902         }
903         transport_register_device(&conn->dev);
904
905         spin_lock_irqsave(&connlock, flags);
906         list_add(&conn->conn_list, &connlist);
907         conn->active = 1;
908         spin_unlock_irqrestore(&connlock, flags);
909         return conn;
910
911 release_parent_ref:
912         put_device(&session->dev);
913 free_conn:
914         kfree(conn);
915         return NULL;
916 }
917
918 EXPORT_SYMBOL_GPL(iscsi_create_conn);
919
920 /**
921  * iscsi_destroy_conn - destroy iscsi class connection
922  * @conn: iscsi cls session
923  *
924  * This can be called from a LLD or iscsi_transport.
925  */
926 int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
927 {
928         unsigned long flags;
929
930         spin_lock_irqsave(&connlock, flags);
931         conn->active = 0;
932         list_del(&conn->conn_list);
933         spin_unlock_irqrestore(&connlock, flags);
934
935         transport_unregister_device(&conn->dev);
936         device_unregister(&conn->dev);
937         return 0;
938 }
939 EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
940
941 /*
942  * iscsi interface functions
943  */
944 static struct iscsi_internal *
945 iscsi_if_transport_lookup(struct iscsi_transport *tt)
946 {
947         struct iscsi_internal *priv;
948         unsigned long flags;
949
950         spin_lock_irqsave(&iscsi_transport_lock, flags);
951         list_for_each_entry(priv, &iscsi_transports, list) {
952                 if (tt == priv->iscsi_transport) {
953                         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
954                         return priv;
955                 }
956         }
957         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
958         return NULL;
959 }
960
961 static int
962 iscsi_broadcast_skb(struct sk_buff *skb, gfp_t gfp)
963 {
964         int rc;
965
966         rc = netlink_broadcast(nls, skb, 0, 1, gfp);
967         if (rc < 0) {
968                 printk(KERN_ERR "iscsi: can not broadcast skb (%d)\n", rc);
969                 return rc;
970         }
971
972         return 0;
973 }
974
975 static int
976 iscsi_unicast_skb(struct sk_buff *skb, int pid)
977 {
978         int rc;
979
980         rc = netlink_unicast(nls, skb, pid, MSG_DONTWAIT);
981         if (rc < 0) {
982                 printk(KERN_ERR "iscsi: can not unicast skb (%d)\n", rc);
983                 return rc;
984         }
985
986         return 0;
987 }
988
989 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
990                    char *data, uint32_t data_size)
991 {
992         struct nlmsghdr *nlh;
993         struct sk_buff *skb;
994         struct iscsi_uevent *ev;
995         char *pdu;
996         struct iscsi_internal *priv;
997         int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) +
998                               data_size);
999
1000         priv = iscsi_if_transport_lookup(conn->transport);
1001         if (!priv)
1002                 return -EINVAL;
1003
1004         skb = alloc_skb(len, GFP_ATOMIC);
1005         if (!skb) {
1006                 iscsi_conn_error(conn, ISCSI_ERR_CONN_FAILED);
1007                 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
1008                                       "control PDU: OOM\n");
1009                 return -ENOMEM;
1010         }
1011
1012         nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
1013         ev = NLMSG_DATA(nlh);
1014         memset(ev, 0, sizeof(*ev));
1015         ev->transport_handle = iscsi_handle(conn->transport);
1016         ev->type = ISCSI_KEVENT_RECV_PDU;
1017         ev->r.recv_req.cid = conn->cid;
1018         ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
1019         pdu = (char*)ev + sizeof(*ev);
1020         memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
1021         memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
1022
1023         return iscsi_unicast_skb(skb, priv->daemon_pid);
1024 }
1025 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
1026
1027 void iscsi_conn_error(struct iscsi_cls_conn *conn, enum iscsi_err error)
1028 {
1029         struct nlmsghdr *nlh;
1030         struct sk_buff  *skb;
1031         struct iscsi_uevent *ev;
1032         struct iscsi_internal *priv;
1033         int len = NLMSG_SPACE(sizeof(*ev));
1034
1035         priv = iscsi_if_transport_lookup(conn->transport);
1036         if (!priv)
1037                 return;
1038
1039         skb = alloc_skb(len, GFP_ATOMIC);
1040         if (!skb) {
1041                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
1042                                       "conn error (%d)\n", error);
1043                 return;
1044         }
1045
1046         nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
1047         ev = NLMSG_DATA(nlh);
1048         ev->transport_handle = iscsi_handle(conn->transport);
1049         ev->type = ISCSI_KEVENT_CONN_ERROR;
1050         ev->r.connerror.error = error;
1051         ev->r.connerror.cid = conn->cid;
1052         ev->r.connerror.sid = iscsi_conn_get_sid(conn);
1053
1054         iscsi_broadcast_skb(skb, GFP_ATOMIC);
1055
1056         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
1057                               error);
1058 }
1059 EXPORT_SYMBOL_GPL(iscsi_conn_error);
1060
1061 static int
1062 iscsi_if_send_reply(int pid, int seq, int type, int done, int multi,
1063                       void *payload, int size)
1064 {
1065         struct sk_buff  *skb;
1066         struct nlmsghdr *nlh;
1067         int len = NLMSG_SPACE(size);
1068         int flags = multi ? NLM_F_MULTI : 0;
1069         int t = done ? NLMSG_DONE : type;
1070
1071         skb = alloc_skb(len, GFP_ATOMIC);
1072         if (!skb) {
1073                 printk(KERN_ERR "Could not allocate skb to send reply.\n");
1074                 return -ENOMEM;
1075         }
1076
1077         nlh = __nlmsg_put(skb, pid, seq, t, (len - sizeof(*nlh)), 0);
1078         nlh->nlmsg_flags = flags;
1079         memcpy(NLMSG_DATA(nlh), payload, size);
1080         return iscsi_unicast_skb(skb, pid);
1081 }
1082
1083 static int
1084 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
1085 {
1086         struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1087         struct iscsi_stats *stats;
1088         struct sk_buff *skbstat;
1089         struct iscsi_cls_conn *conn;
1090         struct nlmsghdr *nlhstat;
1091         struct iscsi_uevent *evstat;
1092         struct iscsi_internal *priv;
1093         int len = NLMSG_SPACE(sizeof(*ev) +
1094                               sizeof(struct iscsi_stats) +
1095                               sizeof(struct iscsi_stats_custom) *
1096                               ISCSI_STATS_CUSTOM_MAX);
1097         int err = 0;
1098
1099         priv = iscsi_if_transport_lookup(transport);
1100         if (!priv)
1101                 return -EINVAL;
1102
1103         conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
1104         if (!conn)
1105                 return -EEXIST;
1106
1107         do {
1108                 int actual_size;
1109
1110                 skbstat = alloc_skb(len, GFP_ATOMIC);
1111                 if (!skbstat) {
1112                         iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
1113                                               "deliver stats: OOM\n");
1114                         return -ENOMEM;
1115                 }
1116
1117                 nlhstat = __nlmsg_put(skbstat, priv->daemon_pid, 0, 0,
1118                                       (len - sizeof(*nlhstat)), 0);
1119                 evstat = NLMSG_DATA(nlhstat);
1120                 memset(evstat, 0, sizeof(*evstat));
1121                 evstat->transport_handle = iscsi_handle(conn->transport);
1122                 evstat->type = nlh->nlmsg_type;
1123                 evstat->u.get_stats.cid =
1124                         ev->u.get_stats.cid;
1125                 evstat->u.get_stats.sid =
1126                         ev->u.get_stats.sid;
1127                 stats = (struct iscsi_stats *)
1128                         ((char*)evstat + sizeof(*evstat));
1129                 memset(stats, 0, sizeof(*stats));
1130
1131                 transport->get_stats(conn, stats);
1132                 actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) +
1133                                           sizeof(struct iscsi_stats) +
1134                                           sizeof(struct iscsi_stats_custom) *
1135                                           stats->custom_length);
1136                 actual_size -= sizeof(*nlhstat);
1137                 actual_size = NLMSG_LENGTH(actual_size);
1138                 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
1139                 nlhstat->nlmsg_len = actual_size;
1140
1141                 err = iscsi_unicast_skb(skbstat, priv->daemon_pid);
1142         } while (err < 0 && err != -ECONNREFUSED);
1143
1144         return err;
1145 }
1146
1147 /**
1148  * iscsi_session_event - send session destr. completion event
1149  * @session: iscsi class session
1150  * @event: type of event
1151  */
1152 int iscsi_session_event(struct iscsi_cls_session *session,
1153                         enum iscsi_uevent_e event)
1154 {
1155         struct iscsi_internal *priv;
1156         struct Scsi_Host *shost;
1157         struct iscsi_uevent *ev;
1158         struct sk_buff  *skb;
1159         struct nlmsghdr *nlh;
1160         int rc, len = NLMSG_SPACE(sizeof(*ev));
1161
1162         priv = iscsi_if_transport_lookup(session->transport);
1163         if (!priv)
1164                 return -EINVAL;
1165         shost = iscsi_session_to_shost(session);
1166
1167         skb = alloc_skb(len, GFP_KERNEL);
1168         if (!skb) {
1169                 iscsi_cls_session_printk(KERN_ERR, session,
1170                                          "Cannot notify userspace of session "
1171                                          "event %u\n", event);
1172                 return -ENOMEM;
1173         }
1174
1175         nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
1176         ev = NLMSG_DATA(nlh);
1177         ev->transport_handle = iscsi_handle(session->transport);
1178
1179         ev->type = event;
1180         switch (event) {
1181         case ISCSI_KEVENT_DESTROY_SESSION:
1182                 ev->r.d_session.host_no = shost->host_no;
1183                 ev->r.d_session.sid = session->sid;
1184                 break;
1185         case ISCSI_KEVENT_CREATE_SESSION:
1186                 ev->r.c_session_ret.host_no = shost->host_no;
1187                 ev->r.c_session_ret.sid = session->sid;
1188                 break;
1189         case ISCSI_KEVENT_UNBIND_SESSION:
1190                 ev->r.unbind_session.host_no = shost->host_no;
1191                 ev->r.unbind_session.sid = session->sid;
1192                 break;
1193         default:
1194                 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
1195                                          "%u.\n", event);
1196                 kfree_skb(skb);
1197                 return -EINVAL;
1198         }
1199
1200         /*
1201          * this will occur if the daemon is not up, so we just warn
1202          * the user and when the daemon is restarted it will handle it
1203          */
1204         rc = iscsi_broadcast_skb(skb, GFP_KERNEL);
1205         if (rc < 0)
1206                 iscsi_cls_session_printk(KERN_ERR, session,
1207                                          "Cannot notify userspace of session "
1208                                          "event %u. Check iscsi daemon\n",
1209                                          event);
1210         return rc;
1211 }
1212 EXPORT_SYMBOL_GPL(iscsi_session_event);
1213
1214 static int
1215 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
1216                         struct iscsi_uevent *ev, uint32_t initial_cmdsn,
1217                         uint16_t cmds_max, uint16_t queue_depth)
1218 {
1219         struct iscsi_transport *transport = priv->iscsi_transport;
1220         struct iscsi_cls_session *session;
1221         uint32_t host_no;
1222
1223         session = transport->create_session(ep, cmds_max, queue_depth,
1224                                             initial_cmdsn, &host_no);
1225         if (!session)
1226                 return -ENOMEM;
1227
1228         ev->r.c_session_ret.host_no = host_no;
1229         ev->r.c_session_ret.sid = session->sid;
1230         return 0;
1231 }
1232
1233 static int
1234 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1235 {
1236         struct iscsi_cls_conn *conn;
1237         struct iscsi_cls_session *session;
1238
1239         session = iscsi_session_lookup(ev->u.c_conn.sid);
1240         if (!session) {
1241                 printk(KERN_ERR "iscsi: invalid session %d.\n",
1242                        ev->u.c_conn.sid);
1243                 return -EINVAL;
1244         }
1245
1246         conn = transport->create_conn(session, ev->u.c_conn.cid);
1247         if (!conn) {
1248                 iscsi_cls_session_printk(KERN_ERR, session,
1249                                          "couldn't create a new connection.");
1250                 return -ENOMEM;
1251         }
1252
1253         ev->r.c_conn_ret.sid = session->sid;
1254         ev->r.c_conn_ret.cid = conn->cid;
1255         return 0;
1256 }
1257
1258 static int
1259 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1260 {
1261         struct iscsi_cls_conn *conn;
1262
1263         conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
1264         if (!conn)
1265                 return -EINVAL;
1266
1267         if (transport->destroy_conn)
1268                 transport->destroy_conn(conn);
1269         return 0;
1270 }
1271
1272 static int
1273 iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1274 {
1275         char *data = (char*)ev + sizeof(*ev);
1276         struct iscsi_cls_conn *conn;
1277         struct iscsi_cls_session *session;
1278         int err = 0, value = 0;
1279
1280         session = iscsi_session_lookup(ev->u.set_param.sid);
1281         conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
1282         if (!conn || !session)
1283                 return -EINVAL;
1284
1285         switch (ev->u.set_param.param) {
1286         case ISCSI_PARAM_SESS_RECOVERY_TMO:
1287                 sscanf(data, "%d", &value);
1288                 if (value != 0)
1289                         session->recovery_tmo = value;
1290                 break;
1291         default:
1292                 err = transport->set_param(conn, ev->u.set_param.param,
1293                                            data, ev->u.set_param.len);
1294         }
1295
1296         return err;
1297 }
1298
1299 static int
1300 iscsi_if_transport_ep(struct iscsi_transport *transport,
1301                       struct iscsi_uevent *ev, int msg_type)
1302 {
1303         struct iscsi_endpoint *ep;
1304         struct sockaddr *dst_addr;
1305         int rc = 0;
1306
1307         switch (msg_type) {
1308         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1309                 if (!transport->ep_connect)
1310                         return -EINVAL;
1311
1312                 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1313                 ep = transport->ep_connect(dst_addr,
1314                                            ev->u.ep_connect.non_blocking);
1315                 if (IS_ERR(ep))
1316                         return PTR_ERR(ep);
1317
1318                 ev->r.ep_connect_ret.handle = ep->id;
1319                 break;
1320         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1321                 if (!transport->ep_poll)
1322                         return -EINVAL;
1323
1324                 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
1325                 if (!ep)
1326                         return -EINVAL;
1327
1328                 ev->r.retcode = transport->ep_poll(ep,
1329                                                    ev->u.ep_poll.timeout_ms);
1330                 break;
1331         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1332                 if (!transport->ep_disconnect)
1333                         return -EINVAL;
1334
1335                 ep = iscsi_lookup_endpoint(ev->u.ep_disconnect.ep_handle);
1336                 if (!ep)
1337                         return -EINVAL;
1338
1339                 transport->ep_disconnect(ep);
1340                 break;
1341         }
1342         return rc;
1343 }
1344
1345 static int
1346 iscsi_tgt_dscvr(struct iscsi_transport *transport,
1347                 struct iscsi_uevent *ev)
1348 {
1349         struct Scsi_Host *shost;
1350         struct sockaddr *dst_addr;
1351         int err;
1352
1353         if (!transport->tgt_dscvr)
1354                 return -EINVAL;
1355
1356         shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
1357         if (IS_ERR(shost)) {
1358                 printk(KERN_ERR "target discovery could not find host no %u\n",
1359                        ev->u.tgt_dscvr.host_no);
1360                 return -ENODEV;
1361         }
1362
1363
1364         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1365         err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
1366                                    ev->u.tgt_dscvr.enable, dst_addr);
1367         scsi_host_put(shost);
1368         return err;
1369 }
1370
1371 static int
1372 iscsi_set_host_param(struct iscsi_transport *transport,
1373                      struct iscsi_uevent *ev)
1374 {
1375         char *data = (char*)ev + sizeof(*ev);
1376         struct Scsi_Host *shost;
1377         int err;
1378
1379         if (!transport->set_host_param)
1380                 return -ENOSYS;
1381
1382         shost = scsi_host_lookup(ev->u.set_host_param.host_no);
1383         if (IS_ERR(shost)) {
1384                 printk(KERN_ERR "set_host_param could not find host no %u\n",
1385                        ev->u.set_host_param.host_no);
1386                 return -ENODEV;
1387         }
1388
1389         err = transport->set_host_param(shost, ev->u.set_host_param.param,
1390                                         data, ev->u.set_host_param.len);
1391         scsi_host_put(shost);
1392         return err;
1393 }
1394
1395 static int
1396 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1397 {
1398         int err = 0;
1399         struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1400         struct iscsi_transport *transport = NULL;
1401         struct iscsi_internal *priv;
1402         struct iscsi_cls_session *session;
1403         struct iscsi_cls_conn *conn;
1404         struct iscsi_endpoint *ep = NULL;
1405
1406         priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
1407         if (!priv)
1408                 return -EINVAL;
1409         transport = priv->iscsi_transport;
1410
1411         if (!try_module_get(transport->owner))
1412                 return -EINVAL;
1413
1414         priv->daemon_pid = NETLINK_CREDS(skb)->pid;
1415
1416         switch (nlh->nlmsg_type) {
1417         case ISCSI_UEVENT_CREATE_SESSION:
1418                 err = iscsi_if_create_session(priv, ep, ev,
1419                                               ev->u.c_session.initial_cmdsn,
1420                                               ev->u.c_session.cmds_max,
1421                                               ev->u.c_session.queue_depth);
1422                 break;
1423         case ISCSI_UEVENT_CREATE_BOUND_SESSION:
1424                 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
1425                 if (!ep)
1426                         return -EINVAL;
1427
1428                 err = iscsi_if_create_session(priv, ep, ev,
1429                                         ev->u.c_bound_session.initial_cmdsn,
1430                                         ev->u.c_bound_session.cmds_max,
1431                                         ev->u.c_bound_session.queue_depth);
1432                 break;
1433         case ISCSI_UEVENT_DESTROY_SESSION:
1434                 session = iscsi_session_lookup(ev->u.d_session.sid);
1435                 if (session)
1436                         transport->destroy_session(session);
1437                 else
1438                         err = -EINVAL;
1439                 break;
1440         case ISCSI_UEVENT_UNBIND_SESSION:
1441                 session = iscsi_session_lookup(ev->u.d_session.sid);
1442                 if (session)
1443                         iscsi_unbind_session(session);
1444                 else
1445                         err = -EINVAL;
1446                 break;
1447         case ISCSI_UEVENT_CREATE_CONN:
1448                 err = iscsi_if_create_conn(transport, ev);
1449                 break;
1450         case ISCSI_UEVENT_DESTROY_CONN:
1451                 err = iscsi_if_destroy_conn(transport, ev);
1452                 break;
1453         case ISCSI_UEVENT_BIND_CONN:
1454                 session = iscsi_session_lookup(ev->u.b_conn.sid);
1455                 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
1456
1457                 if (session && conn)
1458                         ev->r.retcode = transport->bind_conn(session, conn,
1459                                         ev->u.b_conn.transport_eph,
1460                                         ev->u.b_conn.is_leading);
1461                 else
1462                         err = -EINVAL;
1463                 break;
1464         case ISCSI_UEVENT_SET_PARAM:
1465                 err = iscsi_set_param(transport, ev);
1466                 break;
1467         case ISCSI_UEVENT_START_CONN:
1468                 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
1469                 if (conn)
1470                         ev->r.retcode = transport->start_conn(conn);
1471                 else
1472                         err = -EINVAL;
1473                 break;
1474         case ISCSI_UEVENT_STOP_CONN:
1475                 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
1476                 if (conn)
1477                         transport->stop_conn(conn, ev->u.stop_conn.flag);
1478                 else
1479                         err = -EINVAL;
1480                 break;
1481         case ISCSI_UEVENT_SEND_PDU:
1482                 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
1483                 if (conn)
1484                         ev->r.retcode = transport->send_pdu(conn,
1485                                 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
1486                                 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
1487                                 ev->u.send_pdu.data_size);
1488                 else
1489                         err = -EINVAL;
1490                 break;
1491         case ISCSI_UEVENT_GET_STATS:
1492                 err = iscsi_if_get_stats(transport, nlh);
1493                 break;
1494         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1495         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1496         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1497                 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
1498                 break;
1499         case ISCSI_UEVENT_TGT_DSCVR:
1500                 err = iscsi_tgt_dscvr(transport, ev);
1501                 break;
1502         case ISCSI_UEVENT_SET_HOST_PARAM:
1503                 err = iscsi_set_host_param(transport, ev);
1504                 break;
1505         default:
1506                 err = -ENOSYS;
1507                 break;
1508         }
1509
1510         module_put(transport->owner);
1511         return err;
1512 }
1513
1514 /*
1515  * Get message from skb.  Each message is processed by iscsi_if_recv_msg.
1516  * Malformed skbs with wrong lengths or invalid creds are not processed.
1517  */
1518 static void
1519 iscsi_if_rx(struct sk_buff *skb)
1520 {
1521         mutex_lock(&rx_queue_mutex);
1522         while (skb->len >= NLMSG_SPACE(0)) {
1523                 int err;
1524                 uint32_t rlen;
1525                 struct nlmsghdr *nlh;
1526                 struct iscsi_uevent *ev;
1527
1528                 nlh = nlmsg_hdr(skb);
1529                 if (nlh->nlmsg_len < sizeof(*nlh) ||
1530                     skb->len < nlh->nlmsg_len) {
1531                         break;
1532                 }
1533
1534                 ev = NLMSG_DATA(nlh);
1535                 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
1536                 if (rlen > skb->len)
1537                         rlen = skb->len;
1538
1539                 err = iscsi_if_recv_msg(skb, nlh);
1540                 if (err) {
1541                         ev->type = ISCSI_KEVENT_IF_ERROR;
1542                         ev->iferror = err;
1543                 }
1544                 do {
1545                         /*
1546                          * special case for GET_STATS:
1547                          * on success - sending reply and stats from
1548                          * inside of if_recv_msg(),
1549                          * on error - fall through.
1550                          */
1551                         if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
1552                                 break;
1553                         err = iscsi_if_send_reply(
1554                                 NETLINK_CREDS(skb)->pid, nlh->nlmsg_seq,
1555                                 nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
1556                 } while (err < 0 && err != -ECONNREFUSED);
1557                 skb_pull(skb, rlen);
1558         }
1559         mutex_unlock(&rx_queue_mutex);
1560 }
1561
1562 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store)              \
1563 struct device_attribute dev_attr_##_prefix##_##_name =  \
1564         __ATTR(_name,_mode,_show,_store)
1565
1566 /*
1567  * iSCSI connection attrs
1568  */
1569 #define iscsi_conn_attr_show(param)                                     \
1570 static ssize_t                                                          \
1571 show_conn_param_##param(struct device *dev,                             \
1572                         struct device_attribute *attr, char *buf)       \
1573 {                                                                       \
1574         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
1575         struct iscsi_transport *t = conn->transport;                    \
1576         return t->get_conn_param(conn, param, buf);                     \
1577 }
1578
1579 #define iscsi_conn_attr(field, param)                                   \
1580         iscsi_conn_attr_show(param)                                     \
1581 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param,  \
1582                         NULL);
1583
1584 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
1585 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
1586 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
1587 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
1588 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
1589 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
1590 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
1591 iscsi_conn_attr(port, ISCSI_PARAM_CONN_PORT);
1592 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
1593 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
1594 iscsi_conn_attr(address, ISCSI_PARAM_CONN_ADDRESS);
1595 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
1596 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
1597
1598 /*
1599  * iSCSI session attrs
1600  */
1601 #define iscsi_session_attr_show(param, perm)                            \
1602 static ssize_t                                                          \
1603 show_session_param_##param(struct device *dev,                          \
1604                            struct device_attribute *attr, char *buf)    \
1605 {                                                                       \
1606         struct iscsi_cls_session *session =                             \
1607                 iscsi_dev_to_session(dev->parent);                      \
1608         struct iscsi_transport *t = session->transport;                 \
1609                                                                         \
1610         if (perm && !capable(CAP_SYS_ADMIN))                            \
1611                 return -EACCES;                                         \
1612         return t->get_session_param(session, param, buf);               \
1613 }
1614
1615 #define iscsi_session_attr(field, param, perm)                          \
1616         iscsi_session_attr_show(param, perm)                            \
1617 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
1618                         NULL);
1619
1620 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
1621 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
1622 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
1623 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
1624 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
1625 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
1626 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
1627 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
1628 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
1629 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
1630 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
1631 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
1632 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
1633 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
1634 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
1635 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
1636 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
1637 iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
1638 iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0)
1639
1640 static ssize_t
1641 show_priv_session_state(struct device *dev, struct device_attribute *attr,
1642                         char *buf)
1643 {
1644         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
1645         return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
1646 }
1647 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
1648                         NULL);
1649
1650 #define iscsi_priv_session_attr_show(field, format)                     \
1651 static ssize_t                                                          \
1652 show_priv_session_##field(struct device *dev,                           \
1653                           struct device_attribute *attr, char *buf)     \
1654 {                                                                       \
1655         struct iscsi_cls_session *session =                             \
1656                         iscsi_dev_to_session(dev->parent);              \
1657         return sprintf(buf, format"\n", session->field);                \
1658 }
1659
1660 #define iscsi_priv_session_attr(field, format)                          \
1661         iscsi_priv_session_attr_show(field, format)                     \
1662 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO, show_priv_session_##field, \
1663                         NULL)
1664 iscsi_priv_session_attr(recovery_tmo, "%d");
1665
1666 /*
1667  * iSCSI host attrs
1668  */
1669 #define iscsi_host_attr_show(param)                                     \
1670 static ssize_t                                                          \
1671 show_host_param_##param(struct device *dev,                             \
1672                         struct device_attribute *attr, char *buf)       \
1673 {                                                                       \
1674         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
1675         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
1676         return priv->iscsi_transport->get_host_param(shost, param, buf); \
1677 }
1678
1679 #define iscsi_host_attr(field, param)                                   \
1680         iscsi_host_attr_show(param)                                     \
1681 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param,  \
1682                         NULL);
1683
1684 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
1685 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
1686 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
1687 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
1688
1689 #define SETUP_PRIV_SESSION_RD_ATTR(field)                               \
1690 do {                                                                    \
1691         priv->session_attrs[count] = &dev_attr_priv_sess_##field; \
1692         count++;                                                        \
1693 } while (0)
1694
1695
1696 #define SETUP_SESSION_RD_ATTR(field, param_flag)                        \
1697 do {                                                                    \
1698         if (tt->param_mask & param_flag) {                              \
1699                 priv->session_attrs[count] = &dev_attr_sess_##field; \
1700                 count++;                                                \
1701         }                                                               \
1702 } while (0)
1703
1704 #define SETUP_CONN_RD_ATTR(field, param_flag)                           \
1705 do {                                                                    \
1706         if (tt->param_mask & param_flag) {                              \
1707                 priv->conn_attrs[count] = &dev_attr_conn_##field; \
1708                 count++;                                                \
1709         }                                                               \
1710 } while (0)
1711
1712 #define SETUP_HOST_RD_ATTR(field, param_flag)                           \
1713 do {                                                                    \
1714         if (tt->host_param_mask & param_flag) {                         \
1715                 priv->host_attrs[count] = &dev_attr_host_##field; \
1716                 count++;                                                \
1717         }                                                               \
1718 } while (0)
1719
1720 static int iscsi_session_match(struct attribute_container *cont,
1721                            struct device *dev)
1722 {
1723         struct iscsi_cls_session *session;
1724         struct Scsi_Host *shost;
1725         struct iscsi_internal *priv;
1726
1727         if (!iscsi_is_session_dev(dev))
1728                 return 0;
1729
1730         session = iscsi_dev_to_session(dev);
1731         shost = iscsi_session_to_shost(session);
1732         if (!shost->transportt)
1733                 return 0;
1734
1735         priv = to_iscsi_internal(shost->transportt);
1736         if (priv->session_cont.ac.class != &iscsi_session_class.class)
1737                 return 0;
1738
1739         return &priv->session_cont.ac == cont;
1740 }
1741
1742 static int iscsi_conn_match(struct attribute_container *cont,
1743                            struct device *dev)
1744 {
1745         struct iscsi_cls_session *session;
1746         struct iscsi_cls_conn *conn;
1747         struct Scsi_Host *shost;
1748         struct iscsi_internal *priv;
1749
1750         if (!iscsi_is_conn_dev(dev))
1751                 return 0;
1752
1753         conn = iscsi_dev_to_conn(dev);
1754         session = iscsi_dev_to_session(conn->dev.parent);
1755         shost = iscsi_session_to_shost(session);
1756
1757         if (!shost->transportt)
1758                 return 0;
1759
1760         priv = to_iscsi_internal(shost->transportt);
1761         if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
1762                 return 0;
1763
1764         return &priv->conn_cont.ac == cont;
1765 }
1766
1767 static int iscsi_host_match(struct attribute_container *cont,
1768                             struct device *dev)
1769 {
1770         struct Scsi_Host *shost;
1771         struct iscsi_internal *priv;
1772
1773         if (!scsi_is_host_device(dev))
1774                 return 0;
1775
1776         shost = dev_to_shost(dev);
1777         if (!shost->transportt  ||
1778             shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
1779                 return 0;
1780
1781         priv = to_iscsi_internal(shost->transportt);
1782         return &priv->t.host_attrs.ac == cont;
1783 }
1784
1785 struct scsi_transport_template *
1786 iscsi_register_transport(struct iscsi_transport *tt)
1787 {
1788         struct iscsi_internal *priv;
1789         unsigned long flags;
1790         int count = 0, err;
1791
1792         BUG_ON(!tt);
1793
1794         priv = iscsi_if_transport_lookup(tt);
1795         if (priv)
1796                 return NULL;
1797
1798         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1799         if (!priv)
1800                 return NULL;
1801         INIT_LIST_HEAD(&priv->list);
1802         priv->daemon_pid = -1;
1803         priv->iscsi_transport = tt;
1804         priv->t.user_scan = iscsi_user_scan;
1805         if (!(tt->caps & CAP_DATA_PATH_OFFLOAD))
1806                 priv->t.create_work_queue = 1;
1807
1808         priv->dev.class = &iscsi_transport_class;
1809         snprintf(priv->dev.bus_id, BUS_ID_SIZE, "%s", tt->name);
1810         err = device_register(&priv->dev);
1811         if (err)
1812                 goto free_priv;
1813
1814         err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
1815         if (err)
1816                 goto unregister_dev;
1817
1818         /* host parameters */
1819         priv->t.host_attrs.ac.attrs = &priv->host_attrs[0];
1820         priv->t.host_attrs.ac.class = &iscsi_host_class.class;
1821         priv->t.host_attrs.ac.match = iscsi_host_match;
1822         priv->t.host_size = sizeof(struct iscsi_cls_host);
1823         transport_container_register(&priv->t.host_attrs);
1824
1825         SETUP_HOST_RD_ATTR(netdev, ISCSI_HOST_NETDEV_NAME);
1826         SETUP_HOST_RD_ATTR(ipaddress, ISCSI_HOST_IPADDRESS);
1827         SETUP_HOST_RD_ATTR(hwaddress, ISCSI_HOST_HWADDRESS);
1828         SETUP_HOST_RD_ATTR(initiatorname, ISCSI_HOST_INITIATOR_NAME);
1829         BUG_ON(count > ISCSI_HOST_ATTRS);
1830         priv->host_attrs[count] = NULL;
1831         count = 0;
1832
1833         /* connection parameters */
1834         priv->conn_cont.ac.attrs = &priv->conn_attrs[0];
1835         priv->conn_cont.ac.class = &iscsi_connection_class.class;
1836         priv->conn_cont.ac.match = iscsi_conn_match;
1837         transport_container_register(&priv->conn_cont);
1838
1839         SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_MAX_RECV_DLENGTH);
1840         SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_MAX_XMIT_DLENGTH);
1841         SETUP_CONN_RD_ATTR(header_digest, ISCSI_HDRDGST_EN);
1842         SETUP_CONN_RD_ATTR(data_digest, ISCSI_DATADGST_EN);
1843         SETUP_CONN_RD_ATTR(ifmarker, ISCSI_IFMARKER_EN);
1844         SETUP_CONN_RD_ATTR(ofmarker, ISCSI_OFMARKER_EN);
1845         SETUP_CONN_RD_ATTR(address, ISCSI_CONN_ADDRESS);
1846         SETUP_CONN_RD_ATTR(port, ISCSI_CONN_PORT);
1847         SETUP_CONN_RD_ATTR(exp_statsn, ISCSI_EXP_STATSN);
1848         SETUP_CONN_RD_ATTR(persistent_address, ISCSI_PERSISTENT_ADDRESS);
1849         SETUP_CONN_RD_ATTR(persistent_port, ISCSI_PERSISTENT_PORT);
1850         SETUP_CONN_RD_ATTR(ping_tmo, ISCSI_PING_TMO);
1851         SETUP_CONN_RD_ATTR(recv_tmo, ISCSI_RECV_TMO);
1852
1853         BUG_ON(count > ISCSI_CONN_ATTRS);
1854         priv->conn_attrs[count] = NULL;
1855         count = 0;
1856
1857         /* session parameters */
1858         priv->session_cont.ac.attrs = &priv->session_attrs[0];
1859         priv->session_cont.ac.class = &iscsi_session_class.class;
1860         priv->session_cont.ac.match = iscsi_session_match;
1861         transport_container_register(&priv->session_cont);
1862
1863         SETUP_SESSION_RD_ATTR(initial_r2t, ISCSI_INITIAL_R2T_EN);
1864         SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_MAX_R2T);
1865         SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_IMM_DATA_EN);
1866         SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_FIRST_BURST);
1867         SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_MAX_BURST);
1868         SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PDU_INORDER_EN);
1869         SETUP_SESSION_RD_ATTR(data_seq_in_order, ISCSI_DATASEQ_INORDER_EN);
1870         SETUP_SESSION_RD_ATTR(erl, ISCSI_ERL);
1871         SETUP_SESSION_RD_ATTR(targetname, ISCSI_TARGET_NAME);
1872         SETUP_SESSION_RD_ATTR(tpgt, ISCSI_TPGT);
1873         SETUP_SESSION_RD_ATTR(password, ISCSI_USERNAME);
1874         SETUP_SESSION_RD_ATTR(password_in, ISCSI_USERNAME_IN);
1875         SETUP_SESSION_RD_ATTR(username, ISCSI_PASSWORD);
1876         SETUP_SESSION_RD_ATTR(username_in, ISCSI_PASSWORD_IN);
1877         SETUP_SESSION_RD_ATTR(fast_abort, ISCSI_FAST_ABORT);
1878         SETUP_SESSION_RD_ATTR(abort_tmo, ISCSI_ABORT_TMO);
1879         SETUP_SESSION_RD_ATTR(lu_reset_tmo,ISCSI_LU_RESET_TMO);
1880         SETUP_SESSION_RD_ATTR(ifacename, ISCSI_IFACE_NAME);
1881         SETUP_SESSION_RD_ATTR(initiatorname, ISCSI_INITIATOR_NAME);
1882         SETUP_PRIV_SESSION_RD_ATTR(recovery_tmo);
1883         SETUP_PRIV_SESSION_RD_ATTR(state);
1884
1885         BUG_ON(count > ISCSI_SESSION_ATTRS);
1886         priv->session_attrs[count] = NULL;
1887
1888         spin_lock_irqsave(&iscsi_transport_lock, flags);
1889         list_add(&priv->list, &iscsi_transports);
1890         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1891
1892         printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
1893         return &priv->t;
1894
1895 unregister_dev:
1896         device_unregister(&priv->dev);
1897         return NULL;
1898 free_priv:
1899         kfree(priv);
1900         return NULL;
1901 }
1902 EXPORT_SYMBOL_GPL(iscsi_register_transport);
1903
1904 int iscsi_unregister_transport(struct iscsi_transport *tt)
1905 {
1906         struct iscsi_internal *priv;
1907         unsigned long flags;
1908
1909         BUG_ON(!tt);
1910
1911         mutex_lock(&rx_queue_mutex);
1912
1913         priv = iscsi_if_transport_lookup(tt);
1914         BUG_ON (!priv);
1915
1916         spin_lock_irqsave(&iscsi_transport_lock, flags);
1917         list_del(&priv->list);
1918         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1919
1920         transport_container_unregister(&priv->conn_cont);
1921         transport_container_unregister(&priv->session_cont);
1922         transport_container_unregister(&priv->t.host_attrs);
1923
1924         sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
1925         device_unregister(&priv->dev);
1926         mutex_unlock(&rx_queue_mutex);
1927
1928         return 0;
1929 }
1930 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
1931
1932 static __init int iscsi_transport_init(void)
1933 {
1934         int err;
1935
1936         printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
1937                 ISCSI_TRANSPORT_VERSION);
1938
1939         atomic_set(&iscsi_session_nr, 0);
1940
1941         err = class_register(&iscsi_transport_class);
1942         if (err)
1943                 return err;
1944
1945         err = class_register(&iscsi_endpoint_class);
1946         if (err)
1947                 goto unregister_transport_class;
1948
1949         err = transport_class_register(&iscsi_host_class);
1950         if (err)
1951                 goto unregister_endpoint_class;
1952
1953         err = transport_class_register(&iscsi_connection_class);
1954         if (err)
1955                 goto unregister_host_class;
1956
1957         err = transport_class_register(&iscsi_session_class);
1958         if (err)
1959                 goto unregister_conn_class;
1960
1961         nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, 1, iscsi_if_rx,
1962                                     NULL, THIS_MODULE);
1963         if (!nls) {
1964                 err = -ENOBUFS;
1965                 goto unregister_session_class;
1966         }
1967
1968         iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
1969         if (!iscsi_eh_timer_workq)
1970                 goto release_nls;
1971
1972         return 0;
1973
1974 release_nls:
1975         netlink_kernel_release(nls);
1976 unregister_session_class:
1977         transport_class_unregister(&iscsi_session_class);
1978 unregister_conn_class:
1979         transport_class_unregister(&iscsi_connection_class);
1980 unregister_host_class:
1981         transport_class_unregister(&iscsi_host_class);
1982 unregister_endpoint_class:
1983         class_unregister(&iscsi_endpoint_class);
1984 unregister_transport_class:
1985         class_unregister(&iscsi_transport_class);
1986         return err;
1987 }
1988
1989 static void __exit iscsi_transport_exit(void)
1990 {
1991         destroy_workqueue(iscsi_eh_timer_workq);
1992         netlink_kernel_release(nls);
1993         transport_class_unregister(&iscsi_connection_class);
1994         transport_class_unregister(&iscsi_session_class);
1995         transport_class_unregister(&iscsi_host_class);
1996         class_unregister(&iscsi_endpoint_class);
1997         class_unregister(&iscsi_transport_class);
1998 }
1999
2000 module_init(iscsi_transport_init);
2001 module_exit(iscsi_transport_exit);
2002
2003 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
2004               "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
2005               "Alex Aizman <itn780@yahoo.com>");
2006 MODULE_DESCRIPTION("iSCSI Transport Interface");
2007 MODULE_LICENSE("GPL");
2008 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);