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staging: meilhaus, annotate cpi functions
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / scsi / scsi_transport_iscsi.c
blobf3e664628d7ae273d6e97c2f794d990b7ea9dcfd
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 struct scsi_transport_template t;
41 struct iscsi_transport *iscsi_transport;
42 struct list_head list;
43 struct device dev;
44
45 struct device_attribute *host_attrs[ISCSI_HOST_ATTRS + 1];
46 struct transport_container conn_cont;
47 struct device_attribute *conn_attrs[ISCSI_CONN_ATTRS + 1];
48 struct transport_container session_cont;
49 struct device_attribute *session_attrs[ISCSI_SESSION_ATTRS + 1];
50 };
51
52 static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
53 static struct workqueue_struct *iscsi_eh_timer_workq;
54
55 /*
56 * list of registered transports and lock that must
57 * be held while accessing list. The iscsi_transport_lock must
58 * be acquired after the rx_queue_mutex.
59 */
60 static LIST_HEAD(iscsi_transports);
61 static DEFINE_SPINLOCK(iscsi_transport_lock);
62
63 #define to_iscsi_internal(tmpl) \
64 container_of(tmpl, struct iscsi_internal, t)
65
66 #define dev_to_iscsi_internal(_dev) \
67 container_of(_dev, struct iscsi_internal, dev)
68
69 static void iscsi_transport_release(struct device *dev)
70 {
71 struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
72 kfree(priv);
73 }
74
75 /*
76 * iscsi_transport_class represents the iscsi_transports that are
77 * registered.
78 */
79 static struct class iscsi_transport_class = {
80 .name = "iscsi_transport",
81 .dev_release = iscsi_transport_release,
82 };
83
84 static ssize_t
85 show_transport_handle(struct device *dev, struct device_attribute *attr,
86 char *buf)
87 {
88 struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
89 return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport));
90 }
91 static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
92
93 #define show_transport_attr(name, format) \
94 static ssize_t \
95 show_transport_##name(struct device *dev, \
96 struct device_attribute *attr,char *buf) \
97 { \
98 struct iscsi_internal *priv = dev_to_iscsi_internal(dev); \
99 return sprintf(buf, format"\n", priv->iscsi_transport->name); \
100 } \
101 static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
102
103 show_transport_attr(caps, "0x%x");
104
105 static struct attribute *iscsi_transport_attrs[] = {
106 &dev_attr_handle.attr,
107 &dev_attr_caps.attr,
108 NULL,
109 };
110
111 static struct attribute_group iscsi_transport_group = {
112 .attrs = iscsi_transport_attrs,
113 };
114
115 /*
116 * iSCSI endpoint attrs
117 */
118 #define iscsi_dev_to_endpoint(_dev) \
119 container_of(_dev, struct iscsi_endpoint, dev)
120
121 #define ISCSI_ATTR(_prefix,_name,_mode,_show,_store) \
122 struct device_attribute dev_attr_##_prefix##_##_name = \
123 __ATTR(_name,_mode,_show,_store)
124
125 static void iscsi_endpoint_release(struct device *dev)
126 {
127 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
128 kfree(ep);
129 }
130
131 static struct class iscsi_endpoint_class = {
132 .name = "iscsi_endpoint",
133 .dev_release = iscsi_endpoint_release,
134 };
135
136 static ssize_t
137 show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
138 {
139 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
140 return sprintf(buf, "%llu\n", (unsigned long long) ep->id);
141 }
142 static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
143
144 static struct attribute *iscsi_endpoint_attrs[] = {
145 &dev_attr_ep_handle.attr,
146 NULL,
147 };
148
149 static struct attribute_group iscsi_endpoint_group = {
150 .attrs = iscsi_endpoint_attrs,
151 };
152
153 #define ISCSI_MAX_EPID -1
154
155 static int iscsi_match_epid(struct device *dev, void *data)
156 {
157 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
158 uint64_t *epid = (uint64_t *) data;
159
160 return *epid == ep->id;
161 }
162
163 struct iscsi_endpoint *
164 iscsi_create_endpoint(int dd_size)
165 {
166 struct device *dev;
167 struct iscsi_endpoint *ep;
168 uint64_t id;
169 int err;
170
171 for (id = 1; id < ISCSI_MAX_EPID; id++) {
172 dev = class_find_device(&iscsi_endpoint_class, NULL, &id,
173 iscsi_match_epid);
174 if (!dev)
175 break;
176 }
177 if (id == ISCSI_MAX_EPID) {
178 printk(KERN_ERR "Too many connections. Max supported %u\n",
179 ISCSI_MAX_EPID - 1);
180 return NULL;
181 }
182
183 ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL);
184 if (!ep)
185 return NULL;
186
187 ep->id = id;
188 ep->dev.class = &iscsi_endpoint_class;
189 dev_set_name(&ep->dev, "ep-%llu", (unsigned long long) id);
190 err = device_register(&ep->dev);
191 if (err)
192 goto free_ep;
193
194 err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group);
195 if (err)
196 goto unregister_dev;
197
198 if (dd_size)
199 ep->dd_data = &ep[1];
200 return ep;
201
202 unregister_dev:
203 device_unregister(&ep->dev);
204 return NULL;
205
206 free_ep:
207 kfree(ep);
208 return NULL;
209 }
210 EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
211
212 void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
213 {
214 sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
215 device_unregister(&ep->dev);
216 }
217 EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
218
219 struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
220 {
221 struct iscsi_endpoint *ep;
222 struct device *dev;
223
224 dev = class_find_device(&iscsi_endpoint_class, NULL, &handle,
225 iscsi_match_epid);
226 if (!dev)
227 return NULL;
228
229 ep = iscsi_dev_to_endpoint(dev);
230 /*
231 * we can drop this now because the interface will prevent
232 * removals and lookups from racing.
233 */
234 put_device(dev);
235 return ep;
236 }
237 EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
238
239 static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
240 struct device *cdev)
241 {
242 struct Scsi_Host *shost = dev_to_shost(dev);
243 struct iscsi_cls_host *ihost = shost->shost_data;
244
245 memset(ihost, 0, sizeof(*ihost));
246 atomic_set(&ihost->nr_scans, 0);
247 mutex_init(&ihost->mutex);
248 return 0;
249 }
250
251 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
252 "iscsi_host",
253 iscsi_setup_host,
254 NULL,
255 NULL);
256
257 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
258 "iscsi_session",
259 NULL,
260 NULL,
261 NULL);
262
263 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
264 "iscsi_connection",
265 NULL,
266 NULL,
267 NULL);
268
269 static struct sock *nls;
270 static DEFINE_MUTEX(rx_queue_mutex);
271
272 static LIST_HEAD(sesslist);
273 static DEFINE_SPINLOCK(sesslock);
274 static LIST_HEAD(connlist);
275 static DEFINE_SPINLOCK(connlock);
276
277 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
278 {
279 struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
280 return sess->sid;
281 }
282
283 /*
284 * Returns the matching session to a given sid
285 */
286 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
287 {
288 unsigned long flags;
289 struct iscsi_cls_session *sess;
290
291 spin_lock_irqsave(&sesslock, flags);
292 list_for_each_entry(sess, &sesslist, sess_list) {
293 if (sess->sid == sid) {
294 spin_unlock_irqrestore(&sesslock, flags);
295 return sess;
296 }
297 }
298 spin_unlock_irqrestore(&sesslock, flags);
299 return NULL;
300 }
301
302 /*
303 * Returns the matching connection to a given sid / cid tuple
304 */
305 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
306 {
307 unsigned long flags;
308 struct iscsi_cls_conn *conn;
309
310 spin_lock_irqsave(&connlock, flags);
311 list_for_each_entry(conn, &connlist, conn_list) {
312 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
313 spin_unlock_irqrestore(&connlock, flags);
314 return conn;
315 }
316 }
317 spin_unlock_irqrestore(&connlock, flags);
318 return NULL;
319 }
320
321 /*
322 * The following functions can be used by LLDs that allocate
323 * their own scsi_hosts or by software iscsi LLDs
324 */
325 static struct {
326 int value;
327 char *name;
328 } iscsi_session_state_names[] = {
329 { ISCSI_SESSION_LOGGED_IN, "LOGGED_IN" },
330 { ISCSI_SESSION_FAILED, "FAILED" },
331 { ISCSI_SESSION_FREE, "FREE" },
332 };
333
334 static const char *iscsi_session_state_name(int state)
335 {
336 int i;
337 char *name = NULL;
338
339 for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
340 if (iscsi_session_state_names[i].value == state) {
341 name = iscsi_session_state_names[i].name;
342 break;
343 }
344 }
345 return name;
346 }
347
348 int iscsi_session_chkready(struct iscsi_cls_session *session)
349 {
350 unsigned long flags;
351 int err;
352
353 spin_lock_irqsave(&session->lock, flags);
354 switch (session->state) {
355 case ISCSI_SESSION_LOGGED_IN:
356 err = 0;
357 break;
358 case ISCSI_SESSION_FAILED:
359 err = DID_IMM_RETRY << 16;
360 break;
361 case ISCSI_SESSION_FREE:
362 err = DID_TRANSPORT_FAILFAST << 16;
363 break;
364 default:
365 err = DID_NO_CONNECT << 16;
366 break;
367 }
368 spin_unlock_irqrestore(&session->lock, flags);
369 return err;
370 }
371 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
372
373 static void iscsi_session_release(struct device *dev)
374 {
375 struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
376 struct Scsi_Host *shost;
377
378 shost = iscsi_session_to_shost(session);
379 scsi_host_put(shost);
380 kfree(session);
381 }
382
383 static int iscsi_is_session_dev(const struct device *dev)
384 {
385 return dev->release == iscsi_session_release;
386 }
387
388 static int iscsi_iter_session_fn(struct device *dev, void *data)
389 {
390 void (* fn) (struct iscsi_cls_session *) = data;
391
392 if (!iscsi_is_session_dev(dev))
393 return 0;
394 fn(iscsi_dev_to_session(dev));
395 return 0;
396 }
397
398 void iscsi_host_for_each_session(struct Scsi_Host *shost,
399 void (*fn)(struct iscsi_cls_session *))
400 {
401 device_for_each_child(&shost->shost_gendev, fn,
402 iscsi_iter_session_fn);
403 }
404 EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
405
406 /**
407 * iscsi_scan_finished - helper to report when running scans are done
408 * @shost: scsi host
409 * @time: scan run time
410 *
411 * This function can be used by drives like qla4xxx to report to the scsi
412 * layer when the scans it kicked off at module load time are done.
413 */
414 int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
415 {
416 struct iscsi_cls_host *ihost = shost->shost_data;
417 /*
418 * qla4xxx will have kicked off some session unblocks before calling
419 * scsi_scan_host, so just wait for them to complete.
420 */
421 return !atomic_read(&ihost->nr_scans);
422 }
423 EXPORT_SYMBOL_GPL(iscsi_scan_finished);
424
425 struct iscsi_scan_data {
426 unsigned int channel;
427 unsigned int id;
428 unsigned int lun;
429 };
430
431 static int iscsi_user_scan_session(struct device *dev, void *data)
432 {
433 struct iscsi_scan_data *scan_data = data;
434 struct iscsi_cls_session *session;
435 struct Scsi_Host *shost;
436 struct iscsi_cls_host *ihost;
437 unsigned long flags;
438 unsigned int id;
439
440 if (!iscsi_is_session_dev(dev))
441 return 0;
442
443 session = iscsi_dev_to_session(dev);
444 shost = iscsi_session_to_shost(session);
445 ihost = shost->shost_data;
446
447 mutex_lock(&ihost->mutex);
448 spin_lock_irqsave(&session->lock, flags);
449 if (session->state != ISCSI_SESSION_LOGGED_IN) {
450 spin_unlock_irqrestore(&session->lock, flags);
451 mutex_unlock(&ihost->mutex);
452 return 0;
453 }
454 id = session->target_id;
455 spin_unlock_irqrestore(&session->lock, flags);
456
457 if (id != ISCSI_MAX_TARGET) {
458 if ((scan_data->channel == SCAN_WILD_CARD ||
459 scan_data->channel == 0) &&
460 (scan_data->id == SCAN_WILD_CARD ||
461 scan_data->id == id))
462 scsi_scan_target(&session->dev, 0, id,
463 scan_data->lun, 1);
464 }
465 mutex_unlock(&ihost->mutex);
466 return 0;
467 }
468
469 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
470 uint id, uint lun)
471 {
472 struct iscsi_scan_data scan_data;
473
474 scan_data.channel = channel;
475 scan_data.id = id;
476 scan_data.lun = lun;
477
478 return device_for_each_child(&shost->shost_gendev, &scan_data,
479 iscsi_user_scan_session);
480 }
481
482 static void iscsi_scan_session(struct work_struct *work)
483 {
484 struct iscsi_cls_session *session =
485 container_of(work, struct iscsi_cls_session, scan_work);
486 struct Scsi_Host *shost = iscsi_session_to_shost(session);
487 struct iscsi_cls_host *ihost = shost->shost_data;
488 struct iscsi_scan_data scan_data;
489
490 scan_data.channel = 0;
491 scan_data.id = SCAN_WILD_CARD;
492 scan_data.lun = SCAN_WILD_CARD;
493
494 iscsi_user_scan_session(&session->dev, &scan_data);
495 atomic_dec(&ihost->nr_scans);
496 }
497
498 static void session_recovery_timedout(struct work_struct *work)
499 {
500 struct iscsi_cls_session *session =
501 container_of(work, struct iscsi_cls_session,
502 recovery_work.work);
503 unsigned long flags;
504
505 iscsi_cls_session_printk(KERN_INFO, session,
506 "session recovery timed out after %d secs\n",
507 session->recovery_tmo);
508
509 spin_lock_irqsave(&session->lock, flags);
510 switch (session->state) {
511 case ISCSI_SESSION_FAILED:
512 session->state = ISCSI_SESSION_FREE;
513 break;
514 case ISCSI_SESSION_LOGGED_IN:
515 case ISCSI_SESSION_FREE:
516 /* we raced with the unblock's flush */
517 spin_unlock_irqrestore(&session->lock, flags);
518 return;
519 }
520 spin_unlock_irqrestore(&session->lock, flags);
521
522 if (session->transport->session_recovery_timedout)
523 session->transport->session_recovery_timedout(session);
524
525 scsi_target_unblock(&session->dev);
526 }
527
528 static void __iscsi_unblock_session(struct work_struct *work)
529 {
530 struct iscsi_cls_session *session =
531 container_of(work, struct iscsi_cls_session,
532 unblock_work);
533 struct Scsi_Host *shost = iscsi_session_to_shost(session);
534 struct iscsi_cls_host *ihost = shost->shost_data;
535 unsigned long flags;
536
537 /*
538 * The recovery and unblock work get run from the same workqueue,
539 * so try to cancel it if it was going to run after this unblock.
540 */
541 cancel_delayed_work(&session->recovery_work);
542 spin_lock_irqsave(&session->lock, flags);
543 session->state = ISCSI_SESSION_LOGGED_IN;
544 spin_unlock_irqrestore(&session->lock, flags);
545 /* start IO */
546 scsi_target_unblock(&session->dev);
547 /*
548 * Only do kernel scanning if the driver is properly hooked into
549 * the async scanning code (drivers like iscsi_tcp do login and
550 * scanning from userspace).
551 */
552 if (shost->hostt->scan_finished) {
553 if (scsi_queue_work(shost, &session->scan_work))
554 atomic_inc(&ihost->nr_scans);
555 }
556 }
557
558 /**
559 * iscsi_unblock_session - set a session as logged in and start IO.
560 * @session: iscsi session
561 *
562 * Mark a session as ready to accept IO.
563 */
564 void iscsi_unblock_session(struct iscsi_cls_session *session)
565 {
566 queue_work(iscsi_eh_timer_workq, &session->unblock_work);
567 /*
568 * make sure all the events have completed before tell the driver
569 * it is safe
570 */
571 flush_workqueue(iscsi_eh_timer_workq);
572 }
573 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
574
575 static void __iscsi_block_session(struct work_struct *work)
576 {
577 struct iscsi_cls_session *session =
578 container_of(work, struct iscsi_cls_session,
579 block_work);
580 unsigned long flags;
581
582 spin_lock_irqsave(&session->lock, flags);
583 session->state = ISCSI_SESSION_FAILED;
584 spin_unlock_irqrestore(&session->lock, flags);
585 scsi_target_block(&session->dev);
586 queue_delayed_work(iscsi_eh_timer_workq, &session->recovery_work,
587 session->recovery_tmo * HZ);
588 }
589
590 void iscsi_block_session(struct iscsi_cls_session *session)
591 {
592 queue_work(iscsi_eh_timer_workq, &session->block_work);
593 }
594 EXPORT_SYMBOL_GPL(iscsi_block_session);
595
596 static void __iscsi_unbind_session(struct work_struct *work)
597 {
598 struct iscsi_cls_session *session =
599 container_of(work, struct iscsi_cls_session,
600 unbind_work);
601 struct Scsi_Host *shost = iscsi_session_to_shost(session);
602 struct iscsi_cls_host *ihost = shost->shost_data;
603 unsigned long flags;
604
605 /* Prevent new scans and make sure scanning is not in progress */
606 mutex_lock(&ihost->mutex);
607 spin_lock_irqsave(&session->lock, flags);
608 if (session->target_id == ISCSI_MAX_TARGET) {
609 spin_unlock_irqrestore(&session->lock, flags);
610 mutex_unlock(&ihost->mutex);
611 return;
612 }
613 session->target_id = ISCSI_MAX_TARGET;
614 spin_unlock_irqrestore(&session->lock, flags);
615 mutex_unlock(&ihost->mutex);
616
617 scsi_remove_target(&session->dev);
618 iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
619 }
620
621 struct iscsi_cls_session *
622 iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
623 int dd_size)
624 {
625 struct iscsi_cls_session *session;
626
627 session = kzalloc(sizeof(*session) + dd_size,
628 GFP_KERNEL);
629 if (!session)
630 return NULL;
631
632 session->transport = transport;
633 session->recovery_tmo = 120;
634 session->state = ISCSI_SESSION_FREE;
635 INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
636 INIT_LIST_HEAD(&session->sess_list);
637 INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
638 INIT_WORK(&session->block_work, __iscsi_block_session);
639 INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
640 INIT_WORK(&session->scan_work, iscsi_scan_session);
641 spin_lock_init(&session->lock);
642
643 /* this is released in the dev's release function */
644 scsi_host_get(shost);
645 session->dev.parent = &shost->shost_gendev;
646 session->dev.release = iscsi_session_release;
647 device_initialize(&session->dev);
648 if (dd_size)
649 session->dd_data = &session[1];
650 return session;
651 }
652 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
653
654 static int iscsi_get_next_target_id(struct device *dev, void *data)
655 {
656 struct iscsi_cls_session *session;
657 unsigned long flags;
658 int err = 0;
659
660 if (!iscsi_is_session_dev(dev))
661 return 0;
662
663 session = iscsi_dev_to_session(dev);
664 spin_lock_irqsave(&session->lock, flags);
665 if (*((unsigned int *) data) == session->target_id)
666 err = -EEXIST;
667 spin_unlock_irqrestore(&session->lock, flags);
668 return err;
669 }
670
671 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
672 {
673 struct Scsi_Host *shost = iscsi_session_to_shost(session);
674 struct iscsi_cls_host *ihost;
675 unsigned long flags;
676 unsigned int id = target_id;
677 int err;
678
679 ihost = shost->shost_data;
680 session->sid = atomic_add_return(1, &iscsi_session_nr);
681
682 if (id == ISCSI_MAX_TARGET) {
683 for (id = 0; id < ISCSI_MAX_TARGET; id++) {
684 err = device_for_each_child(&shost->shost_gendev, &id,
685 iscsi_get_next_target_id);
686 if (!err)
687 break;
688 }
689
690 if (id == ISCSI_MAX_TARGET) {
691 iscsi_cls_session_printk(KERN_ERR, session,
692 "Too many iscsi targets. Max "
693 "number of targets is %d.\n",
694 ISCSI_MAX_TARGET - 1);
695 goto release_host;
696 }
697 }
698 session->target_id = id;
699
700 dev_set_name(&session->dev, "session%u", session->sid);
701 err = device_add(&session->dev);
702 if (err) {
703 iscsi_cls_session_printk(KERN_ERR, session,
704 "could not register session's dev\n");
705 goto release_host;
706 }
707 transport_register_device(&session->dev);
708
709 spin_lock_irqsave(&sesslock, flags);
710 list_add(&session->sess_list, &sesslist);
711 spin_unlock_irqrestore(&sesslock, flags);
712
713 iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
714 return 0;
715
716 release_host:
717 scsi_host_put(shost);
718 return err;
719 }
720 EXPORT_SYMBOL_GPL(iscsi_add_session);
721
722 /**
723 * iscsi_create_session - create iscsi class session
724 * @shost: scsi host
725 * @transport: iscsi transport
726 * @dd_size: private driver data size
727 * @target_id: which target
728 *
729 * This can be called from a LLD or iscsi_transport.
730 */
731 struct iscsi_cls_session *
732 iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
733 int dd_size, unsigned int target_id)
734 {
735 struct iscsi_cls_session *session;
736
737 session = iscsi_alloc_session(shost, transport, dd_size);
738 if (!session)
739 return NULL;
740
741 if (iscsi_add_session(session, target_id)) {
742 iscsi_free_session(session);
743 return NULL;
744 }
745 return session;
746 }
747 EXPORT_SYMBOL_GPL(iscsi_create_session);
748
749 static void iscsi_conn_release(struct device *dev)
750 {
751 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
752 struct device *parent = conn->dev.parent;
753
754 kfree(conn);
755 put_device(parent);
756 }
757
758 static int iscsi_is_conn_dev(const struct device *dev)
759 {
760 return dev->release == iscsi_conn_release;
761 }
762
763 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
764 {
765 if (!iscsi_is_conn_dev(dev))
766 return 0;
767 return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
768 }
769
770 void iscsi_remove_session(struct iscsi_cls_session *session)
771 {
772 struct Scsi_Host *shost = iscsi_session_to_shost(session);
773 unsigned long flags;
774 int err;
775
776 spin_lock_irqsave(&sesslock, flags);
777 list_del(&session->sess_list);
778 spin_unlock_irqrestore(&sesslock, flags);
779
780 /* make sure there are no blocks/unblocks queued */
781 flush_workqueue(iscsi_eh_timer_workq);
782 /* make sure the timedout callout is not running */
783 if (!cancel_delayed_work(&session->recovery_work))
784 flush_workqueue(iscsi_eh_timer_workq);
785 /*
786 * If we are blocked let commands flow again. The lld or iscsi
787 * layer should set up the queuecommand to fail commands.
788 * We assume that LLD will not be calling block/unblock while
789 * removing the session.
790 */
791 spin_lock_irqsave(&session->lock, flags);
792 session->state = ISCSI_SESSION_FREE;
793 spin_unlock_irqrestore(&session->lock, flags);
794
795 scsi_target_unblock(&session->dev);
796 /* flush running scans then delete devices */
797 scsi_flush_work(shost);
798 __iscsi_unbind_session(&session->unbind_work);
799
800 /* hw iscsi may not have removed all connections from session */
801 err = device_for_each_child(&session->dev, NULL,
802 iscsi_iter_destroy_conn_fn);
803 if (err)
804 iscsi_cls_session_printk(KERN_ERR, session,
805 "Could not delete all connections "
806 "for session. Error %d.\n", err);
807
808 transport_unregister_device(&session->dev);
809 device_del(&session->dev);
810 }
811 EXPORT_SYMBOL_GPL(iscsi_remove_session);
812
813 void iscsi_free_session(struct iscsi_cls_session *session)
814 {
815 iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
816 put_device(&session->dev);
817 }
818 EXPORT_SYMBOL_GPL(iscsi_free_session);
819
820 /**
821 * iscsi_destroy_session - destroy iscsi session
822 * @session: iscsi_session
823 *
824 * Can be called by a LLD or iscsi_transport. There must not be
825 * any running connections.
826 */
827 int iscsi_destroy_session(struct iscsi_cls_session *session)
828 {
829 iscsi_remove_session(session);
830 iscsi_free_session(session);
831 return 0;
832 }
833 EXPORT_SYMBOL_GPL(iscsi_destroy_session);
834
835 /**
836 * iscsi_create_conn - create iscsi class connection
837 * @session: iscsi cls session
838 * @dd_size: private driver data size
839 * @cid: connection id
840 *
841 * This can be called from a LLD or iscsi_transport. The connection
842 * is child of the session so cid must be unique for all connections
843 * on the session.
844 *
845 * Since we do not support MCS, cid will normally be zero. In some cases
846 * for software iscsi we could be trying to preallocate a connection struct
847 * in which case there could be two connection structs and cid would be
848 * non-zero.
849 */
850 struct iscsi_cls_conn *
851 iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
852 {
853 struct iscsi_transport *transport = session->transport;
854 struct iscsi_cls_conn *conn;
855 unsigned long flags;
856 int err;
857
858 conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
859 if (!conn)
860 return NULL;
861 if (dd_size)
862 conn->dd_data = &conn[1];
863
864 INIT_LIST_HEAD(&conn->conn_list);
865 conn->transport = transport;
866 conn->cid = cid;
867
868 /* this is released in the dev's release function */
869 if (!get_device(&session->dev))
870 goto free_conn;
871
872 dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
873 conn->dev.parent = &session->dev;
874 conn->dev.release = iscsi_conn_release;
875 err = device_register(&conn->dev);
876 if (err) {
877 iscsi_cls_session_printk(KERN_ERR, session, "could not "
878 "register connection's dev\n");
879 goto release_parent_ref;
880 }
881 transport_register_device(&conn->dev);
882
883 spin_lock_irqsave(&connlock, flags);
884 list_add(&conn->conn_list, &connlist);
885 conn->active = 1;
886 spin_unlock_irqrestore(&connlock, flags);
887 return conn;
888
889 release_parent_ref:
890 put_device(&session->dev);
891 free_conn:
892 kfree(conn);
893 return NULL;
894 }
895
896 EXPORT_SYMBOL_GPL(iscsi_create_conn);
897
898 /**
899 * iscsi_destroy_conn - destroy iscsi class connection
900 * @conn: iscsi cls session
901 *
902 * This can be called from a LLD or iscsi_transport.
903 */
904 int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
905 {
906 unsigned long flags;
907
908 spin_lock_irqsave(&connlock, flags);
909 conn->active = 0;
910 list_del(&conn->conn_list);
911 spin_unlock_irqrestore(&connlock, flags);
912
913 transport_unregister_device(&conn->dev);
914 device_unregister(&conn->dev);
915 return 0;
916 }
917 EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
918
919 /*
920 * iscsi interface functions
921 */
922 static struct iscsi_internal *
923 iscsi_if_transport_lookup(struct iscsi_transport *tt)
924 {
925 struct iscsi_internal *priv;
926 unsigned long flags;
927
928 spin_lock_irqsave(&iscsi_transport_lock, flags);
929 list_for_each_entry(priv, &iscsi_transports, list) {
930 if (tt == priv->iscsi_transport) {
931 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
932 return priv;
933 }
934 }
935 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
936 return NULL;
937 }
938
939 static int
940 iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
941 {
942 return nlmsg_multicast(nls, skb, 0, group, gfp);
943 }
944
945 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
946 char *data, uint32_t data_size)
947 {
948 struct nlmsghdr *nlh;
949 struct sk_buff *skb;
950 struct iscsi_uevent *ev;
951 char *pdu;
952 struct iscsi_internal *priv;
953 int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) +
954 data_size);
955
956 priv = iscsi_if_transport_lookup(conn->transport);
957 if (!priv)
958 return -EINVAL;
959
960 skb = alloc_skb(len, GFP_ATOMIC);
961 if (!skb) {
962 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
963 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
964 "control PDU: OOM\n");
965 return -ENOMEM;
966 }
967
968 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
969 ev = NLMSG_DATA(nlh);
970 memset(ev, 0, sizeof(*ev));
971 ev->transport_handle = iscsi_handle(conn->transport);
972 ev->type = ISCSI_KEVENT_RECV_PDU;
973 ev->r.recv_req.cid = conn->cid;
974 ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
975 pdu = (char*)ev + sizeof(*ev);
976 memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
977 memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
978
979 return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
980 }
981 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
982
983 int iscsi_offload_mesg(struct Scsi_Host *shost,
984 struct iscsi_transport *transport, uint32_t type,
985 char *data, uint16_t data_size)
986 {
987 struct nlmsghdr *nlh;
988 struct sk_buff *skb;
989 struct iscsi_uevent *ev;
990 int len = NLMSG_SPACE(sizeof(*ev) + data_size);
991
992 skb = alloc_skb(len, GFP_NOIO);
993 if (!skb) {
994 printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
995 return -ENOMEM;
996 }
997
998 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
999 ev = NLMSG_DATA(nlh);
1000 memset(ev, 0, sizeof(*ev));
1001 ev->type = type;
1002 ev->transport_handle = iscsi_handle(transport);
1003 switch (type) {
1004 case ISCSI_KEVENT_PATH_REQ:
1005 ev->r.req_path.host_no = shost->host_no;
1006 break;
1007 case ISCSI_KEVENT_IF_DOWN:
1008 ev->r.notify_if_down.host_no = shost->host_no;
1009 break;
1010 }
1011
1012 memcpy((char *)ev + sizeof(*ev), data, data_size);
1013
1014 return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_NOIO);
1015 }
1016 EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
1017
1018 void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
1019 {
1020 struct nlmsghdr *nlh;
1021 struct sk_buff *skb;
1022 struct iscsi_uevent *ev;
1023 struct iscsi_internal *priv;
1024 int len = NLMSG_SPACE(sizeof(*ev));
1025
1026 priv = iscsi_if_transport_lookup(conn->transport);
1027 if (!priv)
1028 return;
1029
1030 skb = alloc_skb(len, GFP_ATOMIC);
1031 if (!skb) {
1032 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
1033 "conn error (%d)\n", error);
1034 return;
1035 }
1036
1037 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1038 ev = NLMSG_DATA(nlh);
1039 ev->transport_handle = iscsi_handle(conn->transport);
1040 ev->type = ISCSI_KEVENT_CONN_ERROR;
1041 ev->r.connerror.error = error;
1042 ev->r.connerror.cid = conn->cid;
1043 ev->r.connerror.sid = iscsi_conn_get_sid(conn);
1044
1045 iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1046
1047 iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
1048 error);
1049 }
1050 EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
1051
1052 static int
1053 iscsi_if_send_reply(uint32_t group, int seq, int type, int done, int multi,
1054 void *payload, int size)
1055 {
1056 struct sk_buff *skb;
1057 struct nlmsghdr *nlh;
1058 int len = NLMSG_SPACE(size);
1059 int flags = multi ? NLM_F_MULTI : 0;
1060 int t = done ? NLMSG_DONE : type;
1061
1062 skb = alloc_skb(len, GFP_ATOMIC);
1063 if (!skb) {
1064 printk(KERN_ERR "Could not allocate skb to send reply.\n");
1065 return -ENOMEM;
1066 }
1067
1068 nlh = __nlmsg_put(skb, 0, 0, t, (len - sizeof(*nlh)), 0);
1069 nlh->nlmsg_flags = flags;
1070 memcpy(NLMSG_DATA(nlh), payload, size);
1071 return iscsi_multicast_skb(skb, group, GFP_ATOMIC);
1072 }
1073
1074 static int
1075 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
1076 {
1077 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1078 struct iscsi_stats *stats;
1079 struct sk_buff *skbstat;
1080 struct iscsi_cls_conn *conn;
1081 struct nlmsghdr *nlhstat;
1082 struct iscsi_uevent *evstat;
1083 struct iscsi_internal *priv;
1084 int len = NLMSG_SPACE(sizeof(*ev) +
1085 sizeof(struct iscsi_stats) +
1086 sizeof(struct iscsi_stats_custom) *
1087 ISCSI_STATS_CUSTOM_MAX);
1088 int err = 0;
1089
1090 priv = iscsi_if_transport_lookup(transport);
1091 if (!priv)
1092 return -EINVAL;
1093
1094 conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
1095 if (!conn)
1096 return -EEXIST;
1097
1098 do {
1099 int actual_size;
1100
1101 skbstat = alloc_skb(len, GFP_ATOMIC);
1102 if (!skbstat) {
1103 iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
1104 "deliver stats: OOM\n");
1105 return -ENOMEM;
1106 }
1107
1108 nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
1109 (len - sizeof(*nlhstat)), 0);
1110 evstat = NLMSG_DATA(nlhstat);
1111 memset(evstat, 0, sizeof(*evstat));
1112 evstat->transport_handle = iscsi_handle(conn->transport);
1113 evstat->type = nlh->nlmsg_type;
1114 evstat->u.get_stats.cid =
1115 ev->u.get_stats.cid;
1116 evstat->u.get_stats.sid =
1117 ev->u.get_stats.sid;
1118 stats = (struct iscsi_stats *)
1119 ((char*)evstat + sizeof(*evstat));
1120 memset(stats, 0, sizeof(*stats));
1121
1122 transport->get_stats(conn, stats);
1123 actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) +
1124 sizeof(struct iscsi_stats) +
1125 sizeof(struct iscsi_stats_custom) *
1126 stats->custom_length);
1127 actual_size -= sizeof(*nlhstat);
1128 actual_size = NLMSG_LENGTH(actual_size);
1129 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
1130 nlhstat->nlmsg_len = actual_size;
1131
1132 err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
1133 GFP_ATOMIC);
1134 } while (err < 0 && err != -ECONNREFUSED);
1135
1136 return err;
1137 }
1138
1139 /**
1140 * iscsi_session_event - send session destr. completion event
1141 * @session: iscsi class session
1142 * @event: type of event
1143 */
1144 int iscsi_session_event(struct iscsi_cls_session *session,
1145 enum iscsi_uevent_e event)
1146 {
1147 struct iscsi_internal *priv;
1148 struct Scsi_Host *shost;
1149 struct iscsi_uevent *ev;
1150 struct sk_buff *skb;
1151 struct nlmsghdr *nlh;
1152 int rc, len = NLMSG_SPACE(sizeof(*ev));
1153
1154 priv = iscsi_if_transport_lookup(session->transport);
1155 if (!priv)
1156 return -EINVAL;
1157 shost = iscsi_session_to_shost(session);
1158
1159 skb = alloc_skb(len, GFP_KERNEL);
1160 if (!skb) {
1161 iscsi_cls_session_printk(KERN_ERR, session,
1162 "Cannot notify userspace of session "
1163 "event %u\n", event);
1164 return -ENOMEM;
1165 }
1166
1167 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1168 ev = NLMSG_DATA(nlh);
1169 ev->transport_handle = iscsi_handle(session->transport);
1170
1171 ev->type = event;
1172 switch (event) {
1173 case ISCSI_KEVENT_DESTROY_SESSION:
1174 ev->r.d_session.host_no = shost->host_no;
1175 ev->r.d_session.sid = session->sid;
1176 break;
1177 case ISCSI_KEVENT_CREATE_SESSION:
1178 ev->r.c_session_ret.host_no = shost->host_no;
1179 ev->r.c_session_ret.sid = session->sid;
1180 break;
1181 case ISCSI_KEVENT_UNBIND_SESSION:
1182 ev->r.unbind_session.host_no = shost->host_no;
1183 ev->r.unbind_session.sid = session->sid;
1184 break;
1185 default:
1186 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
1187 "%u.\n", event);
1188 kfree_skb(skb);
1189 return -EINVAL;
1190 }
1191
1192 /*
1193 * this will occur if the daemon is not up, so we just warn
1194 * the user and when the daemon is restarted it will handle it
1195 */
1196 rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
1197 if (rc == -ESRCH)
1198 iscsi_cls_session_printk(KERN_ERR, session,
1199 "Cannot notify userspace of session "
1200 "event %u. Check iscsi daemon\n",
1201 event);
1202 return rc;
1203 }
1204 EXPORT_SYMBOL_GPL(iscsi_session_event);
1205
1206 static int
1207 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
1208 struct iscsi_uevent *ev, uint32_t initial_cmdsn,
1209 uint16_t cmds_max, uint16_t queue_depth)
1210 {
1211 struct iscsi_transport *transport = priv->iscsi_transport;
1212 struct iscsi_cls_session *session;
1213 struct Scsi_Host *shost;
1214
1215 session = transport->create_session(ep, cmds_max, queue_depth,
1216 initial_cmdsn);
1217 if (!session)
1218 return -ENOMEM;
1219
1220 shost = iscsi_session_to_shost(session);
1221 ev->r.c_session_ret.host_no = shost->host_no;
1222 ev->r.c_session_ret.sid = session->sid;
1223 return 0;
1224 }
1225
1226 static int
1227 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1228 {
1229 struct iscsi_cls_conn *conn;
1230 struct iscsi_cls_session *session;
1231
1232 session = iscsi_session_lookup(ev->u.c_conn.sid);
1233 if (!session) {
1234 printk(KERN_ERR "iscsi: invalid session %d.\n",
1235 ev->u.c_conn.sid);
1236 return -EINVAL;
1237 }
1238
1239 conn = transport->create_conn(session, ev->u.c_conn.cid);
1240 if (!conn) {
1241 iscsi_cls_session_printk(KERN_ERR, session,
1242 "couldn't create a new connection.");
1243 return -ENOMEM;
1244 }
1245
1246 ev->r.c_conn_ret.sid = session->sid;
1247 ev->r.c_conn_ret.cid = conn->cid;
1248 return 0;
1249 }
1250
1251 static int
1252 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1253 {
1254 struct iscsi_cls_conn *conn;
1255
1256 conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
1257 if (!conn)
1258 return -EINVAL;
1259
1260 if (transport->destroy_conn)
1261 transport->destroy_conn(conn);
1262 return 0;
1263 }
1264
1265 static int
1266 iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1267 {
1268 char *data = (char*)ev + sizeof(*ev);
1269 struct iscsi_cls_conn *conn;
1270 struct iscsi_cls_session *session;
1271 int err = 0, value = 0;
1272
1273 session = iscsi_session_lookup(ev->u.set_param.sid);
1274 conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
1275 if (!conn || !session)
1276 return -EINVAL;
1277
1278 switch (ev->u.set_param.param) {
1279 case ISCSI_PARAM_SESS_RECOVERY_TMO:
1280 sscanf(data, "%d", &value);
1281 if (value != 0)
1282 session->recovery_tmo = value;
1283 break;
1284 default:
1285 err = transport->set_param(conn, ev->u.set_param.param,
1286 data, ev->u.set_param.len);
1287 }
1288
1289 return err;
1290 }
1291
1292 static int iscsi_if_ep_connect(struct iscsi_transport *transport,
1293 struct iscsi_uevent *ev, int msg_type)
1294 {
1295 struct iscsi_endpoint *ep;
1296 struct sockaddr *dst_addr;
1297 struct Scsi_Host *shost = NULL;
1298 int non_blocking, err = 0;
1299
1300 if (!transport->ep_connect)
1301 return -EINVAL;
1302
1303 if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
1304 shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
1305 if (!shost) {
1306 printk(KERN_ERR "ep connect failed. Could not find "
1307 "host no %u\n",
1308 ev->u.ep_connect_through_host.host_no);
1309 return -ENODEV;
1310 }
1311 non_blocking = ev->u.ep_connect_through_host.non_blocking;
1312 } else
1313 non_blocking = ev->u.ep_connect.non_blocking;
1314
1315 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1316 ep = transport->ep_connect(shost, dst_addr, non_blocking);
1317 if (IS_ERR(ep)) {
1318 err = PTR_ERR(ep);
1319 goto release_host;
1320 }
1321
1322 ev->r.ep_connect_ret.handle = ep->id;
1323 release_host:
1324 if (shost)
1325 scsi_host_put(shost);
1326 return err;
1327 }
1328
1329 static int
1330 iscsi_if_transport_ep(struct iscsi_transport *transport,
1331 struct iscsi_uevent *ev, int msg_type)
1332 {
1333 struct iscsi_endpoint *ep;
1334 int rc = 0;
1335
1336 switch (msg_type) {
1337 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
1338 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1339 rc = iscsi_if_ep_connect(transport, ev, msg_type);
1340 break;
1341 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1342 if (!transport->ep_poll)
1343 return -EINVAL;
1344
1345 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
1346 if (!ep)
1347 return -EINVAL;
1348
1349 ev->r.retcode = transport->ep_poll(ep,
1350 ev->u.ep_poll.timeout_ms);
1351 break;
1352 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1353 if (!transport->ep_disconnect)
1354 return -EINVAL;
1355
1356 ep = iscsi_lookup_endpoint(ev->u.ep_disconnect.ep_handle);
1357 if (!ep)
1358 return -EINVAL;
1359
1360 transport->ep_disconnect(ep);
1361 break;
1362 }
1363 return rc;
1364 }
1365
1366 static int
1367 iscsi_tgt_dscvr(struct iscsi_transport *transport,
1368 struct iscsi_uevent *ev)
1369 {
1370 struct Scsi_Host *shost;
1371 struct sockaddr *dst_addr;
1372 int err;
1373
1374 if (!transport->tgt_dscvr)
1375 return -EINVAL;
1376
1377 shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
1378 if (!shost) {
1379 printk(KERN_ERR "target discovery could not find host no %u\n",
1380 ev->u.tgt_dscvr.host_no);
1381 return -ENODEV;
1382 }
1383
1384
1385 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1386 err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
1387 ev->u.tgt_dscvr.enable, dst_addr);
1388 scsi_host_put(shost);
1389 return err;
1390 }
1391
1392 static int
1393 iscsi_set_host_param(struct iscsi_transport *transport,
1394 struct iscsi_uevent *ev)
1395 {
1396 char *data = (char*)ev + sizeof(*ev);
1397 struct Scsi_Host *shost;
1398 int err;
1399
1400 if (!transport->set_host_param)
1401 return -ENOSYS;
1402
1403 shost = scsi_host_lookup(ev->u.set_host_param.host_no);
1404 if (!shost) {
1405 printk(KERN_ERR "set_host_param could not find host no %u\n",
1406 ev->u.set_host_param.host_no);
1407 return -ENODEV;
1408 }
1409
1410 err = transport->set_host_param(shost, ev->u.set_host_param.param,
1411 data, ev->u.set_host_param.len);
1412 scsi_host_put(shost);
1413 return err;
1414 }
1415
1416 static int
1417 iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1418 {
1419 struct Scsi_Host *shost;
1420 struct iscsi_path *params;
1421 int err;
1422
1423 if (!transport->set_path)
1424 return -ENOSYS;
1425
1426 shost = scsi_host_lookup(ev->u.set_path.host_no);
1427 if (!shost) {
1428 printk(KERN_ERR "set path could not find host no %u\n",
1429 ev->u.set_path.host_no);
1430 return -ENODEV;
1431 }
1432
1433 params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
1434 err = transport->set_path(shost, params);
1435
1436 scsi_host_put(shost);
1437 return err;
1438 }
1439
1440 static int
1441 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
1442 {
1443 int err = 0;
1444 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1445 struct iscsi_transport *transport = NULL;
1446 struct iscsi_internal *priv;
1447 struct iscsi_cls_session *session;
1448 struct iscsi_cls_conn *conn;
1449 struct iscsi_endpoint *ep = NULL;
1450
1451 if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
1452 *group = ISCSI_NL_GRP_UIP;
1453 else
1454 *group = ISCSI_NL_GRP_ISCSID;
1455
1456 priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
1457 if (!priv)
1458 return -EINVAL;
1459 transport = priv->iscsi_transport;
1460
1461 if (!try_module_get(transport->owner))
1462 return -EINVAL;
1463
1464 switch (nlh->nlmsg_type) {
1465 case ISCSI_UEVENT_CREATE_SESSION:
1466 err = iscsi_if_create_session(priv, ep, ev,
1467 ev->u.c_session.initial_cmdsn,
1468 ev->u.c_session.cmds_max,
1469 ev->u.c_session.queue_depth);
1470 break;
1471 case ISCSI_UEVENT_CREATE_BOUND_SESSION:
1472 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
1473 if (!ep) {
1474 err = -EINVAL;
1475 break;
1476 }
1477
1478 err = iscsi_if_create_session(priv, ep, ev,
1479 ev->u.c_bound_session.initial_cmdsn,
1480 ev->u.c_bound_session.cmds_max,
1481 ev->u.c_bound_session.queue_depth);
1482 break;
1483 case ISCSI_UEVENT_DESTROY_SESSION:
1484 session = iscsi_session_lookup(ev->u.d_session.sid);
1485 if (session)
1486 transport->destroy_session(session);
1487 else
1488 err = -EINVAL;
1489 break;
1490 case ISCSI_UEVENT_UNBIND_SESSION:
1491 session = iscsi_session_lookup(ev->u.d_session.sid);
1492 if (session)
1493 scsi_queue_work(iscsi_session_to_shost(session),
1494 &session->unbind_work);
1495 else
1496 err = -EINVAL;
1497 break;
1498 case ISCSI_UEVENT_CREATE_CONN:
1499 err = iscsi_if_create_conn(transport, ev);
1500 break;
1501 case ISCSI_UEVENT_DESTROY_CONN:
1502 err = iscsi_if_destroy_conn(transport, ev);
1503 break;
1504 case ISCSI_UEVENT_BIND_CONN:
1505 session = iscsi_session_lookup(ev->u.b_conn.sid);
1506 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
1507
1508 if (session && conn)
1509 ev->r.retcode = transport->bind_conn(session, conn,
1510 ev->u.b_conn.transport_eph,
1511 ev->u.b_conn.is_leading);
1512 else
1513 err = -EINVAL;
1514 break;
1515 case ISCSI_UEVENT_SET_PARAM:
1516 err = iscsi_set_param(transport, ev);
1517 break;
1518 case ISCSI_UEVENT_START_CONN:
1519 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
1520 if (conn)
1521 ev->r.retcode = transport->start_conn(conn);
1522 else
1523 err = -EINVAL;
1524 break;
1525 case ISCSI_UEVENT_STOP_CONN:
1526 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
1527 if (conn)
1528 transport->stop_conn(conn, ev->u.stop_conn.flag);
1529 else
1530 err = -EINVAL;
1531 break;
1532 case ISCSI_UEVENT_SEND_PDU:
1533 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
1534 if (conn)
1535 ev->r.retcode = transport->send_pdu(conn,
1536 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
1537 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
1538 ev->u.send_pdu.data_size);
1539 else
1540 err = -EINVAL;
1541 break;
1542 case ISCSI_UEVENT_GET_STATS:
1543 err = iscsi_if_get_stats(transport, nlh);
1544 break;
1545 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1546 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1547 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1548 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
1549 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
1550 break;
1551 case ISCSI_UEVENT_TGT_DSCVR:
1552 err = iscsi_tgt_dscvr(transport, ev);
1553 break;
1554 case ISCSI_UEVENT_SET_HOST_PARAM:
1555 err = iscsi_set_host_param(transport, ev);
1556 break;
1557 case ISCSI_UEVENT_PATH_UPDATE:
1558 err = iscsi_set_path(transport, ev);
1559 break;
1560 default:
1561 err = -ENOSYS;
1562 break;
1563 }
1564
1565 module_put(transport->owner);
1566 return err;
1567 }
1568
1569 /*
1570 * Get message from skb. Each message is processed by iscsi_if_recv_msg.
1571 * Malformed skbs with wrong lengths or invalid creds are not processed.
1572 */
1573 static void
1574 iscsi_if_rx(struct sk_buff *skb)
1575 {
1576 mutex_lock(&rx_queue_mutex);
1577 while (skb->len >= NLMSG_SPACE(0)) {
1578 int err;
1579 uint32_t rlen;
1580 struct nlmsghdr *nlh;
1581 struct iscsi_uevent *ev;
1582 uint32_t group;
1583
1584 nlh = nlmsg_hdr(skb);
1585 if (nlh->nlmsg_len < sizeof(*nlh) ||
1586 skb->len < nlh->nlmsg_len) {
1587 break;
1588 }
1589
1590 ev = NLMSG_DATA(nlh);
1591 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
1592 if (rlen > skb->len)
1593 rlen = skb->len;
1594
1595 err = iscsi_if_recv_msg(skb, nlh, &group);
1596 if (err) {
1597 ev->type = ISCSI_KEVENT_IF_ERROR;
1598 ev->iferror = err;
1599 }
1600 do {
1601 /*
1602 * special case for GET_STATS:
1603 * on success - sending reply and stats from
1604 * inside of if_recv_msg(),
1605 * on error - fall through.
1606 */
1607 if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
1608 break;
1609 err = iscsi_if_send_reply(group, nlh->nlmsg_seq,
1610 nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
1611 } while (err < 0 && err != -ECONNREFUSED);
1612 skb_pull(skb, rlen);
1613 }
1614 mutex_unlock(&rx_queue_mutex);
1615 }
1616
1617 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \
1618 struct device_attribute dev_attr_##_prefix##_##_name = \
1619 __ATTR(_name,_mode,_show,_store)
1620
1621 /*
1622 * iSCSI connection attrs
1623 */
1624 #define iscsi_conn_attr_show(param) \
1625 static ssize_t \
1626 show_conn_param_##param(struct device *dev, \
1627 struct device_attribute *attr, char *buf) \
1628 { \
1629 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \
1630 struct iscsi_transport *t = conn->transport; \
1631 return t->get_conn_param(conn, param, buf); \
1632 }
1633
1634 #define iscsi_conn_attr(field, param) \
1635 iscsi_conn_attr_show(param) \
1636 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param, \
1637 NULL);
1638
1639 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
1640 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
1641 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
1642 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
1643 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
1644 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
1645 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
1646 iscsi_conn_attr(port, ISCSI_PARAM_CONN_PORT);
1647 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
1648 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
1649 iscsi_conn_attr(address, ISCSI_PARAM_CONN_ADDRESS);
1650 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
1651 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
1652
1653 /*
1654 * iSCSI session attrs
1655 */
1656 #define iscsi_session_attr_show(param, perm) \
1657 static ssize_t \
1658 show_session_param_##param(struct device *dev, \
1659 struct device_attribute *attr, char *buf) \
1660 { \
1661 struct iscsi_cls_session *session = \
1662 iscsi_dev_to_session(dev->parent); \
1663 struct iscsi_transport *t = session->transport; \
1664 \
1665 if (perm && !capable(CAP_SYS_ADMIN)) \
1666 return -EACCES; \
1667 return t->get_session_param(session, param, buf); \
1668 }
1669
1670 #define iscsi_session_attr(field, param, perm) \
1671 iscsi_session_attr_show(param, perm) \
1672 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
1673 NULL);
1674
1675 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
1676 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
1677 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
1678 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
1679 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
1680 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
1681 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
1682 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
1683 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
1684 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
1685 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
1686 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
1687 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
1688 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
1689 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
1690 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
1691 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
1692 iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
1693 iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0)
1694
1695 static ssize_t
1696 show_priv_session_state(struct device *dev, struct device_attribute *attr,
1697 char *buf)
1698 {
1699 struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
1700 return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
1701 }
1702 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
1703 NULL);
1704
1705 #define iscsi_priv_session_attr_show(field, format) \
1706 static ssize_t \
1707 show_priv_session_##field(struct device *dev, \
1708 struct device_attribute *attr, char *buf) \
1709 { \
1710 struct iscsi_cls_session *session = \
1711 iscsi_dev_to_session(dev->parent); \
1712 return sprintf(buf, format"\n", session->field); \
1713 }
1714
1715 #define iscsi_priv_session_attr(field, format) \
1716 iscsi_priv_session_attr_show(field, format) \
1717 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO, show_priv_session_##field, \
1718 NULL)
1719 iscsi_priv_session_attr(recovery_tmo, "%d");
1720
1721 /*
1722 * iSCSI host attrs
1723 */
1724 #define iscsi_host_attr_show(param) \
1725 static ssize_t \
1726 show_host_param_##param(struct device *dev, \
1727 struct device_attribute *attr, char *buf) \
1728 { \
1729 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1730 struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
1731 return priv->iscsi_transport->get_host_param(shost, param, buf); \
1732 }
1733
1734 #define iscsi_host_attr(field, param) \
1735 iscsi_host_attr_show(param) \
1736 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param, \
1737 NULL);
1738
1739 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
1740 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
1741 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
1742 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
1743
1744 #define SETUP_PRIV_SESSION_RD_ATTR(field) \
1745 do { \
1746 priv->session_attrs[count] = &dev_attr_priv_sess_##field; \
1747 count++; \
1748 } while (0)
1749
1750
1751 #define SETUP_SESSION_RD_ATTR(field, param_flag) \
1752 do { \
1753 if (tt->param_mask & param_flag) { \
1754 priv->session_attrs[count] = &dev_attr_sess_##field; \
1755 count++; \
1756 } \
1757 } while (0)
1758
1759 #define SETUP_CONN_RD_ATTR(field, param_flag) \
1760 do { \
1761 if (tt->param_mask & param_flag) { \
1762 priv->conn_attrs[count] = &dev_attr_conn_##field; \
1763 count++; \
1764 } \
1765 } while (0)
1766
1767 #define SETUP_HOST_RD_ATTR(field, param_flag) \
1768 do { \
1769 if (tt->host_param_mask & param_flag) { \
1770 priv->host_attrs[count] = &dev_attr_host_##field; \
1771 count++; \
1772 } \
1773 } while (0)
1774
1775 static int iscsi_session_match(struct attribute_container *cont,
1776 struct device *dev)
1777 {
1778 struct iscsi_cls_session *session;
1779 struct Scsi_Host *shost;
1780 struct iscsi_internal *priv;
1781
1782 if (!iscsi_is_session_dev(dev))
1783 return 0;
1784
1785 session = iscsi_dev_to_session(dev);
1786 shost = iscsi_session_to_shost(session);
1787 if (!shost->transportt)
1788 return 0;
1789
1790 priv = to_iscsi_internal(shost->transportt);
1791 if (priv->session_cont.ac.class != &iscsi_session_class.class)
1792 return 0;
1793
1794 return &priv->session_cont.ac == cont;
1795 }
1796
1797 static int iscsi_conn_match(struct attribute_container *cont,
1798 struct device *dev)
1799 {
1800 struct iscsi_cls_session *session;
1801 struct iscsi_cls_conn *conn;
1802 struct Scsi_Host *shost;
1803 struct iscsi_internal *priv;
1804
1805 if (!iscsi_is_conn_dev(dev))
1806 return 0;
1807
1808 conn = iscsi_dev_to_conn(dev);
1809 session = iscsi_dev_to_session(conn->dev.parent);
1810 shost = iscsi_session_to_shost(session);
1811
1812 if (!shost->transportt)
1813 return 0;
1814
1815 priv = to_iscsi_internal(shost->transportt);
1816 if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
1817 return 0;
1818
1819 return &priv->conn_cont.ac == cont;
1820 }
1821
1822 static int iscsi_host_match(struct attribute_container *cont,
1823 struct device *dev)
1824 {
1825 struct Scsi_Host *shost;
1826 struct iscsi_internal *priv;
1827
1828 if (!scsi_is_host_device(dev))
1829 return 0;
1830
1831 shost = dev_to_shost(dev);
1832 if (!shost->transportt ||
1833 shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
1834 return 0;
1835
1836 priv = to_iscsi_internal(shost->transportt);
1837 return &priv->t.host_attrs.ac == cont;
1838 }
1839
1840 struct scsi_transport_template *
1841 iscsi_register_transport(struct iscsi_transport *tt)
1842 {
1843 struct iscsi_internal *priv;
1844 unsigned long flags;
1845 int count = 0, err;
1846
1847 BUG_ON(!tt);
1848
1849 priv = iscsi_if_transport_lookup(tt);
1850 if (priv)
1851 return NULL;
1852
1853 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1854 if (!priv)
1855 return NULL;
1856 INIT_LIST_HEAD(&priv->list);
1857 priv->iscsi_transport = tt;
1858 priv->t.user_scan = iscsi_user_scan;
1859 priv->t.create_work_queue = 1;
1860
1861 priv->dev.class = &iscsi_transport_class;
1862 dev_set_name(&priv->dev, "%s", tt->name);
1863 err = device_register(&priv->dev);
1864 if (err)
1865 goto free_priv;
1866
1867 err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
1868 if (err)
1869 goto unregister_dev;
1870
1871 /* host parameters */
1872 priv->t.host_attrs.ac.attrs = &priv->host_attrs[0];
1873 priv->t.host_attrs.ac.class = &iscsi_host_class.class;
1874 priv->t.host_attrs.ac.match = iscsi_host_match;
1875 priv->t.host_size = sizeof(struct iscsi_cls_host);
1876 transport_container_register(&priv->t.host_attrs);
1877
1878 SETUP_HOST_RD_ATTR(netdev, ISCSI_HOST_NETDEV_NAME);
1879 SETUP_HOST_RD_ATTR(ipaddress, ISCSI_HOST_IPADDRESS);
1880 SETUP_HOST_RD_ATTR(hwaddress, ISCSI_HOST_HWADDRESS);
1881 SETUP_HOST_RD_ATTR(initiatorname, ISCSI_HOST_INITIATOR_NAME);
1882 BUG_ON(count > ISCSI_HOST_ATTRS);
1883 priv->host_attrs[count] = NULL;
1884 count = 0;
1885
1886 /* connection parameters */
1887 priv->conn_cont.ac.attrs = &priv->conn_attrs[0];
1888 priv->conn_cont.ac.class = &iscsi_connection_class.class;
1889 priv->conn_cont.ac.match = iscsi_conn_match;
1890 transport_container_register(&priv->conn_cont);
1891
1892 SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_MAX_RECV_DLENGTH);
1893 SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_MAX_XMIT_DLENGTH);
1894 SETUP_CONN_RD_ATTR(header_digest, ISCSI_HDRDGST_EN);
1895 SETUP_CONN_RD_ATTR(data_digest, ISCSI_DATADGST_EN);
1896 SETUP_CONN_RD_ATTR(ifmarker, ISCSI_IFMARKER_EN);
1897 SETUP_CONN_RD_ATTR(ofmarker, ISCSI_OFMARKER_EN);
1898 SETUP_CONN_RD_ATTR(address, ISCSI_CONN_ADDRESS);
1899 SETUP_CONN_RD_ATTR(port, ISCSI_CONN_PORT);
1900 SETUP_CONN_RD_ATTR(exp_statsn, ISCSI_EXP_STATSN);
1901 SETUP_CONN_RD_ATTR(persistent_address, ISCSI_PERSISTENT_ADDRESS);
1902 SETUP_CONN_RD_ATTR(persistent_port, ISCSI_PERSISTENT_PORT);
1903 SETUP_CONN_RD_ATTR(ping_tmo, ISCSI_PING_TMO);
1904 SETUP_CONN_RD_ATTR(recv_tmo, ISCSI_RECV_TMO);
1905
1906 BUG_ON(count > ISCSI_CONN_ATTRS);
1907 priv->conn_attrs[count] = NULL;
1908 count = 0;
1909
1910 /* session parameters */
1911 priv->session_cont.ac.attrs = &priv->session_attrs[0];
1912 priv->session_cont.ac.class = &iscsi_session_class.class;
1913 priv->session_cont.ac.match = iscsi_session_match;
1914 transport_container_register(&priv->session_cont);
1915
1916 SETUP_SESSION_RD_ATTR(initial_r2t, ISCSI_INITIAL_R2T_EN);
1917 SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_MAX_R2T);
1918 SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_IMM_DATA_EN);
1919 SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_FIRST_BURST);
1920 SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_MAX_BURST);
1921 SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PDU_INORDER_EN);
1922 SETUP_SESSION_RD_ATTR(data_seq_in_order, ISCSI_DATASEQ_INORDER_EN);
1923 SETUP_SESSION_RD_ATTR(erl, ISCSI_ERL);
1924 SETUP_SESSION_RD_ATTR(targetname, ISCSI_TARGET_NAME);
1925 SETUP_SESSION_RD_ATTR(tpgt, ISCSI_TPGT);
1926 SETUP_SESSION_RD_ATTR(password, ISCSI_USERNAME);
1927 SETUP_SESSION_RD_ATTR(password_in, ISCSI_USERNAME_IN);
1928 SETUP_SESSION_RD_ATTR(username, ISCSI_PASSWORD);
1929 SETUP_SESSION_RD_ATTR(username_in, ISCSI_PASSWORD_IN);
1930 SETUP_SESSION_RD_ATTR(fast_abort, ISCSI_FAST_ABORT);
1931 SETUP_SESSION_RD_ATTR(abort_tmo, ISCSI_ABORT_TMO);
1932 SETUP_SESSION_RD_ATTR(lu_reset_tmo,ISCSI_LU_RESET_TMO);
1933 SETUP_SESSION_RD_ATTR(ifacename, ISCSI_IFACE_NAME);
1934 SETUP_SESSION_RD_ATTR(initiatorname, ISCSI_INITIATOR_NAME);
1935 SETUP_PRIV_SESSION_RD_ATTR(recovery_tmo);
1936 SETUP_PRIV_SESSION_RD_ATTR(state);
1937
1938 BUG_ON(count > ISCSI_SESSION_ATTRS);
1939 priv->session_attrs[count] = NULL;
1940
1941 spin_lock_irqsave(&iscsi_transport_lock, flags);
1942 list_add(&priv->list, &iscsi_transports);
1943 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1944
1945 printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
1946 return &priv->t;
1947
1948 unregister_dev:
1949 device_unregister(&priv->dev);
1950 return NULL;
1951 free_priv:
1952 kfree(priv);
1953 return NULL;
1954 }
1955 EXPORT_SYMBOL_GPL(iscsi_register_transport);
1956
1957 int iscsi_unregister_transport(struct iscsi_transport *tt)
1958 {
1959 struct iscsi_internal *priv;
1960 unsigned long flags;
1961
1962 BUG_ON(!tt);
1963
1964 mutex_lock(&rx_queue_mutex);
1965
1966 priv = iscsi_if_transport_lookup(tt);
1967 BUG_ON (!priv);
1968
1969 spin_lock_irqsave(&iscsi_transport_lock, flags);
1970 list_del(&priv->list);
1971 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1972
1973 transport_container_unregister(&priv->conn_cont);
1974 transport_container_unregister(&priv->session_cont);
1975 transport_container_unregister(&priv->t.host_attrs);
1976
1977 sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
1978 device_unregister(&priv->dev);
1979 mutex_unlock(&rx_queue_mutex);
1980
1981 return 0;
1982 }
1983 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
1984
1985 static __init int iscsi_transport_init(void)
1986 {
1987 int err;
1988
1989 printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
1990 ISCSI_TRANSPORT_VERSION);
1991
1992 atomic_set(&iscsi_session_nr, 0);
1993
1994 err = class_register(&iscsi_transport_class);
1995 if (err)
1996 return err;
1997
1998 err = class_register(&iscsi_endpoint_class);
1999 if (err)
2000 goto unregister_transport_class;
2001
2002 err = transport_class_register(&iscsi_host_class);
2003 if (err)
2004 goto unregister_endpoint_class;
2005
2006 err = transport_class_register(&iscsi_connection_class);
2007 if (err)
2008 goto unregister_host_class;
2009
2010 err = transport_class_register(&iscsi_session_class);
2011 if (err)
2012 goto unregister_conn_class;
2013
2014 nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, 1, iscsi_if_rx,
2015 NULL, THIS_MODULE);
2016 if (!nls) {
2017 err = -ENOBUFS;
2018 goto unregister_session_class;
2019 }
2020
2021 iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
2022 if (!iscsi_eh_timer_workq)
2023 goto release_nls;
2024
2025 return 0;
2026
2027 release_nls:
2028 netlink_kernel_release(nls);
2029 unregister_session_class:
2030 transport_class_unregister(&iscsi_session_class);
2031 unregister_conn_class:
2032 transport_class_unregister(&iscsi_connection_class);
2033 unregister_host_class:
2034 transport_class_unregister(&iscsi_host_class);
2035 unregister_endpoint_class:
2036 class_unregister(&iscsi_endpoint_class);
2037 unregister_transport_class:
2038 class_unregister(&iscsi_transport_class);
2039 return err;
2040 }
2041
2042 static void __exit iscsi_transport_exit(void)
2043 {
2044 destroy_workqueue(iscsi_eh_timer_workq);
2045 netlink_kernel_release(nls);
2046 transport_class_unregister(&iscsi_connection_class);
2047 transport_class_unregister(&iscsi_session_class);
2048 transport_class_unregister(&iscsi_host_class);
2049 class_unregister(&iscsi_endpoint_class);
2050 class_unregister(&iscsi_transport_class);
2051 }
2052
2053 module_init(iscsi_transport_init);
2054 module_exit(iscsi_transport_exit);
2055
2056 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
2057 "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
2058 "Alex Aizman <itn780@yahoo.com>");
2059 MODULE_DESCRIPTION("iSCSI Transport Interface");
2060 MODULE_LICENSE("GPL");
2061 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree