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Merge branch 'next-queue' into next
[linux-2.6/kvm.git] / drivers / scsi / scsi_transport_iscsi.c
blobea3892e7e0f76a46ef219c12e97b23e13abe326e
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 22
34 #define ISCSI_CONN_ATTRS 13
35 #define ISCSI_HOST_ATTRS 4
36
37 #define ISCSI_TRANSPORT_VERSION "2.0-870"
38
39 static int dbg_session;
40 module_param_named(debug_session, dbg_session, int,
41 S_IRUGO | S_IWUSR);
42 MODULE_PARM_DESC(debug_session,
43 "Turn on debugging for sessions in scsi_transport_iscsi "
44 "module. Set to 1 to turn on, and zero to turn off. Default "
45 "is off.");
46
47 static int dbg_conn;
48 module_param_named(debug_conn, dbg_conn, int,
49 S_IRUGO | S_IWUSR);
50 MODULE_PARM_DESC(debug_conn,
51 "Turn on debugging for connections in scsi_transport_iscsi "
52 "module. Set to 1 to turn on, and zero to turn off. Default "
53 "is off.");
54
55 #define ISCSI_DBG_TRANS_SESSION(_session, dbg_fmt, arg...) \
56 do { \
57 if (dbg_session) \
58 iscsi_cls_session_printk(KERN_INFO, _session, \
59 "%s: " dbg_fmt, \
60 __func__, ##arg); \
61 } while (0);
62
63 #define ISCSI_DBG_TRANS_CONN(_conn, dbg_fmt, arg...) \
64 do { \
65 if (dbg_conn) \
66 iscsi_cls_conn_printk(KERN_INFO, _conn, \
67 "%s: " dbg_fmt, \
68 __func__, ##arg); \
69 } while (0);
70
71 struct iscsi_internal {
72 struct scsi_transport_template t;
73 struct iscsi_transport *iscsi_transport;
74 struct list_head list;
75 struct device dev;
76
77 struct device_attribute *host_attrs[ISCSI_HOST_ATTRS + 1];
78 struct transport_container conn_cont;
79 struct device_attribute *conn_attrs[ISCSI_CONN_ATTRS + 1];
80 struct transport_container session_cont;
81 struct device_attribute *session_attrs[ISCSI_SESSION_ATTRS + 1];
82 };
83
84 static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
85 static struct workqueue_struct *iscsi_eh_timer_workq;
86
87 /*
88 * list of registered transports and lock that must
89 * be held while accessing list. The iscsi_transport_lock must
90 * be acquired after the rx_queue_mutex.
91 */
92 static LIST_HEAD(iscsi_transports);
93 static DEFINE_SPINLOCK(iscsi_transport_lock);
94
95 #define to_iscsi_internal(tmpl) \
96 container_of(tmpl, struct iscsi_internal, t)
97
98 #define dev_to_iscsi_internal(_dev) \
99 container_of(_dev, struct iscsi_internal, dev)
100
101 static void iscsi_transport_release(struct device *dev)
102 {
103 struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
104 kfree(priv);
105 }
106
107 /*
108 * iscsi_transport_class represents the iscsi_transports that are
109 * registered.
110 */
111 static struct class iscsi_transport_class = {
112 .name = "iscsi_transport",
113 .dev_release = iscsi_transport_release,
114 };
115
116 static ssize_t
117 show_transport_handle(struct device *dev, struct device_attribute *attr,
118 char *buf)
119 {
120 struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
121 return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport));
122 }
123 static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
124
125 #define show_transport_attr(name, format) \
126 static ssize_t \
127 show_transport_##name(struct device *dev, \
128 struct device_attribute *attr,char *buf) \
129 { \
130 struct iscsi_internal *priv = dev_to_iscsi_internal(dev); \
131 return sprintf(buf, format"\n", priv->iscsi_transport->name); \
132 } \
133 static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
134
135 show_transport_attr(caps, "0x%x");
136
137 static struct attribute *iscsi_transport_attrs[] = {
138 &dev_attr_handle.attr,
139 &dev_attr_caps.attr,
140 NULL,
141 };
142
143 static struct attribute_group iscsi_transport_group = {
144 .attrs = iscsi_transport_attrs,
145 };
146
147 /*
148 * iSCSI endpoint attrs
149 */
150 #define iscsi_dev_to_endpoint(_dev) \
151 container_of(_dev, struct iscsi_endpoint, dev)
152
153 #define ISCSI_ATTR(_prefix,_name,_mode,_show,_store) \
154 struct device_attribute dev_attr_##_prefix##_##_name = \
155 __ATTR(_name,_mode,_show,_store)
156
157 static void iscsi_endpoint_release(struct device *dev)
158 {
159 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
160 kfree(ep);
161 }
162
163 static struct class iscsi_endpoint_class = {
164 .name = "iscsi_endpoint",
165 .dev_release = iscsi_endpoint_release,
166 };
167
168 static ssize_t
169 show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
170 {
171 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
172 return sprintf(buf, "%llu\n", (unsigned long long) ep->id);
173 }
174 static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
175
176 static struct attribute *iscsi_endpoint_attrs[] = {
177 &dev_attr_ep_handle.attr,
178 NULL,
179 };
180
181 static struct attribute_group iscsi_endpoint_group = {
182 .attrs = iscsi_endpoint_attrs,
183 };
184
185 #define ISCSI_MAX_EPID -1
186
187 static int iscsi_match_epid(struct device *dev, void *data)
188 {
189 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
190 uint64_t *epid = (uint64_t *) data;
191
192 return *epid == ep->id;
193 }
194
195 struct iscsi_endpoint *
196 iscsi_create_endpoint(int dd_size)
197 {
198 struct device *dev;
199 struct iscsi_endpoint *ep;
200 uint64_t id;
201 int err;
202
203 for (id = 1; id < ISCSI_MAX_EPID; id++) {
204 dev = class_find_device(&iscsi_endpoint_class, NULL, &id,
205 iscsi_match_epid);
206 if (!dev)
207 break;
208 }
209 if (id == ISCSI_MAX_EPID) {
210 printk(KERN_ERR "Too many connections. Max supported %u\n",
211 ISCSI_MAX_EPID - 1);
212 return NULL;
213 }
214
215 ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL);
216 if (!ep)
217 return NULL;
218
219 ep->id = id;
220 ep->dev.class = &iscsi_endpoint_class;
221 dev_set_name(&ep->dev, "ep-%llu", (unsigned long long) id);
222 err = device_register(&ep->dev);
223 if (err)
224 goto free_ep;
225
226 err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group);
227 if (err)
228 goto unregister_dev;
229
230 if (dd_size)
231 ep->dd_data = &ep[1];
232 return ep;
233
234 unregister_dev:
235 device_unregister(&ep->dev);
236 return NULL;
237
238 free_ep:
239 kfree(ep);
240 return NULL;
241 }
242 EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
243
244 void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
245 {
246 sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
247 device_unregister(&ep->dev);
248 }
249 EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
250
251 struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
252 {
253 struct iscsi_endpoint *ep;
254 struct device *dev;
255
256 dev = class_find_device(&iscsi_endpoint_class, NULL, &handle,
257 iscsi_match_epid);
258 if (!dev)
259 return NULL;
260
261 ep = iscsi_dev_to_endpoint(dev);
262 /*
263 * we can drop this now because the interface will prevent
264 * removals and lookups from racing.
265 */
266 put_device(dev);
267 return ep;
268 }
269 EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
270
271 static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
272 struct device *cdev)
273 {
274 struct Scsi_Host *shost = dev_to_shost(dev);
275 struct iscsi_cls_host *ihost = shost->shost_data;
276
277 memset(ihost, 0, sizeof(*ihost));
278 atomic_set(&ihost->nr_scans, 0);
279 mutex_init(&ihost->mutex);
280 return 0;
281 }
282
283 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
284 "iscsi_host",
285 iscsi_setup_host,
286 NULL,
287 NULL);
288
289 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
290 "iscsi_session",
291 NULL,
292 NULL,
293 NULL);
294
295 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
296 "iscsi_connection",
297 NULL,
298 NULL,
299 NULL);
300
301 static struct sock *nls;
302 static DEFINE_MUTEX(rx_queue_mutex);
303
304 static LIST_HEAD(sesslist);
305 static DEFINE_SPINLOCK(sesslock);
306 static LIST_HEAD(connlist);
307 static DEFINE_SPINLOCK(connlock);
308
309 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
310 {
311 struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
312 return sess->sid;
313 }
314
315 /*
316 * Returns the matching session to a given sid
317 */
318 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
319 {
320 unsigned long flags;
321 struct iscsi_cls_session *sess;
322
323 spin_lock_irqsave(&sesslock, flags);
324 list_for_each_entry(sess, &sesslist, sess_list) {
325 if (sess->sid == sid) {
326 spin_unlock_irqrestore(&sesslock, flags);
327 return sess;
328 }
329 }
330 spin_unlock_irqrestore(&sesslock, flags);
331 return NULL;
332 }
333
334 /*
335 * Returns the matching connection to a given sid / cid tuple
336 */
337 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
338 {
339 unsigned long flags;
340 struct iscsi_cls_conn *conn;
341
342 spin_lock_irqsave(&connlock, flags);
343 list_for_each_entry(conn, &connlist, conn_list) {
344 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
345 spin_unlock_irqrestore(&connlock, flags);
346 return conn;
347 }
348 }
349 spin_unlock_irqrestore(&connlock, flags);
350 return NULL;
351 }
352
353 /*
354 * The following functions can be used by LLDs that allocate
355 * their own scsi_hosts or by software iscsi LLDs
356 */
357 static struct {
358 int value;
359 char *name;
360 } iscsi_session_state_names[] = {
361 { ISCSI_SESSION_LOGGED_IN, "LOGGED_IN" },
362 { ISCSI_SESSION_FAILED, "FAILED" },
363 { ISCSI_SESSION_FREE, "FREE" },
364 };
365
366 static const char *iscsi_session_state_name(int state)
367 {
368 int i;
369 char *name = NULL;
370
371 for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
372 if (iscsi_session_state_names[i].value == state) {
373 name = iscsi_session_state_names[i].name;
374 break;
375 }
376 }
377 return name;
378 }
379
380 int iscsi_session_chkready(struct iscsi_cls_session *session)
381 {
382 unsigned long flags;
383 int err;
384
385 spin_lock_irqsave(&session->lock, flags);
386 switch (session->state) {
387 case ISCSI_SESSION_LOGGED_IN:
388 err = 0;
389 break;
390 case ISCSI_SESSION_FAILED:
391 err = DID_IMM_RETRY << 16;
392 break;
393 case ISCSI_SESSION_FREE:
394 err = DID_TRANSPORT_FAILFAST << 16;
395 break;
396 default:
397 err = DID_NO_CONNECT << 16;
398 break;
399 }
400 spin_unlock_irqrestore(&session->lock, flags);
401 return err;
402 }
403 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
404
405 static void iscsi_session_release(struct device *dev)
406 {
407 struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
408 struct Scsi_Host *shost;
409
410 shost = iscsi_session_to_shost(session);
411 scsi_host_put(shost);
412 ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
413 kfree(session);
414 }
415
416 static int iscsi_is_session_dev(const struct device *dev)
417 {
418 return dev->release == iscsi_session_release;
419 }
420
421 static int iscsi_iter_session_fn(struct device *dev, void *data)
422 {
423 void (* fn) (struct iscsi_cls_session *) = data;
424
425 if (!iscsi_is_session_dev(dev))
426 return 0;
427 fn(iscsi_dev_to_session(dev));
428 return 0;
429 }
430
431 void iscsi_host_for_each_session(struct Scsi_Host *shost,
432 void (*fn)(struct iscsi_cls_session *))
433 {
434 device_for_each_child(&shost->shost_gendev, fn,
435 iscsi_iter_session_fn);
436 }
437 EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
438
439 /**
440 * iscsi_scan_finished - helper to report when running scans are done
441 * @shost: scsi host
442 * @time: scan run time
443 *
444 * This function can be used by drives like qla4xxx to report to the scsi
445 * layer when the scans it kicked off at module load time are done.
446 */
447 int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
448 {
449 struct iscsi_cls_host *ihost = shost->shost_data;
450 /*
451 * qla4xxx will have kicked off some session unblocks before calling
452 * scsi_scan_host, so just wait for them to complete.
453 */
454 return !atomic_read(&ihost->nr_scans);
455 }
456 EXPORT_SYMBOL_GPL(iscsi_scan_finished);
457
458 struct iscsi_scan_data {
459 unsigned int channel;
460 unsigned int id;
461 unsigned int lun;
462 };
463
464 static int iscsi_user_scan_session(struct device *dev, void *data)
465 {
466 struct iscsi_scan_data *scan_data = data;
467 struct iscsi_cls_session *session;
468 struct Scsi_Host *shost;
469 struct iscsi_cls_host *ihost;
470 unsigned long flags;
471 unsigned int id;
472
473 if (!iscsi_is_session_dev(dev))
474 return 0;
475
476 session = iscsi_dev_to_session(dev);
477
478 ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
479
480 shost = iscsi_session_to_shost(session);
481 ihost = shost->shost_data;
482
483 mutex_lock(&ihost->mutex);
484 spin_lock_irqsave(&session->lock, flags);
485 if (session->state != ISCSI_SESSION_LOGGED_IN) {
486 spin_unlock_irqrestore(&session->lock, flags);
487 goto user_scan_exit;
488 }
489 id = session->target_id;
490 spin_unlock_irqrestore(&session->lock, flags);
491
492 if (id != ISCSI_MAX_TARGET) {
493 if ((scan_data->channel == SCAN_WILD_CARD ||
494 scan_data->channel == 0) &&
495 (scan_data->id == SCAN_WILD_CARD ||
496 scan_data->id == id))
497 scsi_scan_target(&session->dev, 0, id,
498 scan_data->lun, 1);
499 }
500
501 user_scan_exit:
502 mutex_unlock(&ihost->mutex);
503 ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
504 return 0;
505 }
506
507 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
508 uint id, uint lun)
509 {
510 struct iscsi_scan_data scan_data;
511
512 scan_data.channel = channel;
513 scan_data.id = id;
514 scan_data.lun = lun;
515
516 return device_for_each_child(&shost->shost_gendev, &scan_data,
517 iscsi_user_scan_session);
518 }
519
520 static void iscsi_scan_session(struct work_struct *work)
521 {
522 struct iscsi_cls_session *session =
523 container_of(work, struct iscsi_cls_session, scan_work);
524 struct Scsi_Host *shost = iscsi_session_to_shost(session);
525 struct iscsi_cls_host *ihost = shost->shost_data;
526 struct iscsi_scan_data scan_data;
527
528 scan_data.channel = 0;
529 scan_data.id = SCAN_WILD_CARD;
530 scan_data.lun = SCAN_WILD_CARD;
531
532 iscsi_user_scan_session(&session->dev, &scan_data);
533 atomic_dec(&ihost->nr_scans);
534 }
535
536 static void session_recovery_timedout(struct work_struct *work)
537 {
538 struct iscsi_cls_session *session =
539 container_of(work, struct iscsi_cls_session,
540 recovery_work.work);
541 unsigned long flags;
542
543 iscsi_cls_session_printk(KERN_INFO, session,
544 "session recovery timed out after %d secs\n",
545 session->recovery_tmo);
546
547 spin_lock_irqsave(&session->lock, flags);
548 switch (session->state) {
549 case ISCSI_SESSION_FAILED:
550 session->state = ISCSI_SESSION_FREE;
551 break;
552 case ISCSI_SESSION_LOGGED_IN:
553 case ISCSI_SESSION_FREE:
554 /* we raced with the unblock's flush */
555 spin_unlock_irqrestore(&session->lock, flags);
556 return;
557 }
558 spin_unlock_irqrestore(&session->lock, flags);
559
560 if (session->transport->session_recovery_timedout)
561 session->transport->session_recovery_timedout(session);
562
563 ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
564 scsi_target_unblock(&session->dev);
565 ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
566 }
567
568 static void __iscsi_unblock_session(struct work_struct *work)
569 {
570 struct iscsi_cls_session *session =
571 container_of(work, struct iscsi_cls_session,
572 unblock_work);
573 struct Scsi_Host *shost = iscsi_session_to_shost(session);
574 struct iscsi_cls_host *ihost = shost->shost_data;
575 unsigned long flags;
576
577 ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
578 /*
579 * The recovery and unblock work get run from the same workqueue,
580 * so try to cancel it if it was going to run after this unblock.
581 */
582 cancel_delayed_work(&session->recovery_work);
583 spin_lock_irqsave(&session->lock, flags);
584 session->state = ISCSI_SESSION_LOGGED_IN;
585 spin_unlock_irqrestore(&session->lock, flags);
586 /* start IO */
587 scsi_target_unblock(&session->dev);
588 /*
589 * Only do kernel scanning if the driver is properly hooked into
590 * the async scanning code (drivers like iscsi_tcp do login and
591 * scanning from userspace).
592 */
593 if (shost->hostt->scan_finished) {
594 if (scsi_queue_work(shost, &session->scan_work))
595 atomic_inc(&ihost->nr_scans);
596 }
597 ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
598 }
599
600 /**
601 * iscsi_unblock_session - set a session as logged in and start IO.
602 * @session: iscsi session
603 *
604 * Mark a session as ready to accept IO.
605 */
606 void iscsi_unblock_session(struct iscsi_cls_session *session)
607 {
608 queue_work(iscsi_eh_timer_workq, &session->unblock_work);
609 /*
610 * make sure all the events have completed before tell the driver
611 * it is safe
612 */
613 flush_workqueue(iscsi_eh_timer_workq);
614 }
615 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
616
617 static void __iscsi_block_session(struct work_struct *work)
618 {
619 struct iscsi_cls_session *session =
620 container_of(work, struct iscsi_cls_session,
621 block_work);
622 unsigned long flags;
623
624 ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
625 spin_lock_irqsave(&session->lock, flags);
626 session->state = ISCSI_SESSION_FAILED;
627 spin_unlock_irqrestore(&session->lock, flags);
628 scsi_target_block(&session->dev);
629 ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
630 if (session->recovery_tmo >= 0)
631 queue_delayed_work(iscsi_eh_timer_workq,
632 &session->recovery_work,
633 session->recovery_tmo * HZ);
634 }
635
636 void iscsi_block_session(struct iscsi_cls_session *session)
637 {
638 queue_work(iscsi_eh_timer_workq, &session->block_work);
639 }
640 EXPORT_SYMBOL_GPL(iscsi_block_session);
641
642 static void __iscsi_unbind_session(struct work_struct *work)
643 {
644 struct iscsi_cls_session *session =
645 container_of(work, struct iscsi_cls_session,
646 unbind_work);
647 struct Scsi_Host *shost = iscsi_session_to_shost(session);
648 struct iscsi_cls_host *ihost = shost->shost_data;
649 unsigned long flags;
650
651 ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
652
653 /* Prevent new scans and make sure scanning is not in progress */
654 mutex_lock(&ihost->mutex);
655 spin_lock_irqsave(&session->lock, flags);
656 if (session->target_id == ISCSI_MAX_TARGET) {
657 spin_unlock_irqrestore(&session->lock, flags);
658 mutex_unlock(&ihost->mutex);
659 return;
660 }
661 session->target_id = ISCSI_MAX_TARGET;
662 spin_unlock_irqrestore(&session->lock, flags);
663 mutex_unlock(&ihost->mutex);
664
665 scsi_remove_target(&session->dev);
666 iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
667 ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
668 }
669
670 struct iscsi_cls_session *
671 iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
672 int dd_size)
673 {
674 struct iscsi_cls_session *session;
675
676 session = kzalloc(sizeof(*session) + dd_size,
677 GFP_KERNEL);
678 if (!session)
679 return NULL;
680
681 session->transport = transport;
682 session->recovery_tmo = 120;
683 session->state = ISCSI_SESSION_FREE;
684 INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
685 INIT_LIST_HEAD(&session->sess_list);
686 INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
687 INIT_WORK(&session->block_work, __iscsi_block_session);
688 INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
689 INIT_WORK(&session->scan_work, iscsi_scan_session);
690 spin_lock_init(&session->lock);
691
692 /* this is released in the dev's release function */
693 scsi_host_get(shost);
694 session->dev.parent = &shost->shost_gendev;
695 session->dev.release = iscsi_session_release;
696 device_initialize(&session->dev);
697 if (dd_size)
698 session->dd_data = &session[1];
699
700 ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
701 return session;
702 }
703 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
704
705 static int iscsi_get_next_target_id(struct device *dev, void *data)
706 {
707 struct iscsi_cls_session *session;
708 unsigned long flags;
709 int err = 0;
710
711 if (!iscsi_is_session_dev(dev))
712 return 0;
713
714 session = iscsi_dev_to_session(dev);
715 spin_lock_irqsave(&session->lock, flags);
716 if (*((unsigned int *) data) == session->target_id)
717 err = -EEXIST;
718 spin_unlock_irqrestore(&session->lock, flags);
719 return err;
720 }
721
722 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
723 {
724 struct Scsi_Host *shost = iscsi_session_to_shost(session);
725 struct iscsi_cls_host *ihost;
726 unsigned long flags;
727 unsigned int id = target_id;
728 int err;
729
730 ihost = shost->shost_data;
731 session->sid = atomic_add_return(1, &iscsi_session_nr);
732
733 if (id == ISCSI_MAX_TARGET) {
734 for (id = 0; id < ISCSI_MAX_TARGET; id++) {
735 err = device_for_each_child(&shost->shost_gendev, &id,
736 iscsi_get_next_target_id);
737 if (!err)
738 break;
739 }
740
741 if (id == ISCSI_MAX_TARGET) {
742 iscsi_cls_session_printk(KERN_ERR, session,
743 "Too many iscsi targets. Max "
744 "number of targets is %d.\n",
745 ISCSI_MAX_TARGET - 1);
746 err = -EOVERFLOW;
747 goto release_host;
748 }
749 }
750 session->target_id = id;
751
752 dev_set_name(&session->dev, "session%u", session->sid);
753 err = device_add(&session->dev);
754 if (err) {
755 iscsi_cls_session_printk(KERN_ERR, session,
756 "could not register session's dev\n");
757 goto release_host;
758 }
759 transport_register_device(&session->dev);
760
761 spin_lock_irqsave(&sesslock, flags);
762 list_add(&session->sess_list, &sesslist);
763 spin_unlock_irqrestore(&sesslock, flags);
764
765 iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
766 ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
767 return 0;
768
769 release_host:
770 scsi_host_put(shost);
771 return err;
772 }
773 EXPORT_SYMBOL_GPL(iscsi_add_session);
774
775 /**
776 * iscsi_create_session - create iscsi class session
777 * @shost: scsi host
778 * @transport: iscsi transport
779 * @dd_size: private driver data size
780 * @target_id: which target
781 *
782 * This can be called from a LLD or iscsi_transport.
783 */
784 struct iscsi_cls_session *
785 iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
786 int dd_size, unsigned int target_id)
787 {
788 struct iscsi_cls_session *session;
789
790 session = iscsi_alloc_session(shost, transport, dd_size);
791 if (!session)
792 return NULL;
793
794 if (iscsi_add_session(session, target_id)) {
795 iscsi_free_session(session);
796 return NULL;
797 }
798 return session;
799 }
800 EXPORT_SYMBOL_GPL(iscsi_create_session);
801
802 static void iscsi_conn_release(struct device *dev)
803 {
804 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
805 struct device *parent = conn->dev.parent;
806
807 ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
808 kfree(conn);
809 put_device(parent);
810 }
811
812 static int iscsi_is_conn_dev(const struct device *dev)
813 {
814 return dev->release == iscsi_conn_release;
815 }
816
817 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
818 {
819 if (!iscsi_is_conn_dev(dev))
820 return 0;
821 return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
822 }
823
824 void iscsi_remove_session(struct iscsi_cls_session *session)
825 {
826 struct Scsi_Host *shost = iscsi_session_to_shost(session);
827 unsigned long flags;
828 int err;
829
830 ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
831
832 spin_lock_irqsave(&sesslock, flags);
833 list_del(&session->sess_list);
834 spin_unlock_irqrestore(&sesslock, flags);
835
836 /* make sure there are no blocks/unblocks queued */
837 flush_workqueue(iscsi_eh_timer_workq);
838 /* make sure the timedout callout is not running */
839 if (!cancel_delayed_work(&session->recovery_work))
840 flush_workqueue(iscsi_eh_timer_workq);
841 /*
842 * If we are blocked let commands flow again. The lld or iscsi
843 * layer should set up the queuecommand to fail commands.
844 * We assume that LLD will not be calling block/unblock while
845 * removing the session.
846 */
847 spin_lock_irqsave(&session->lock, flags);
848 session->state = ISCSI_SESSION_FREE;
849 spin_unlock_irqrestore(&session->lock, flags);
850
851 scsi_target_unblock(&session->dev);
852 /* flush running scans then delete devices */
853 scsi_flush_work(shost);
854 __iscsi_unbind_session(&session->unbind_work);
855
856 /* hw iscsi may not have removed all connections from session */
857 err = device_for_each_child(&session->dev, NULL,
858 iscsi_iter_destroy_conn_fn);
859 if (err)
860 iscsi_cls_session_printk(KERN_ERR, session,
861 "Could not delete all connections "
862 "for session. Error %d.\n", err);
863
864 transport_unregister_device(&session->dev);
865
866 ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
867 device_del(&session->dev);
868 }
869 EXPORT_SYMBOL_GPL(iscsi_remove_session);
870
871 void iscsi_free_session(struct iscsi_cls_session *session)
872 {
873 ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
874 iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
875 put_device(&session->dev);
876 }
877 EXPORT_SYMBOL_GPL(iscsi_free_session);
878
879 /**
880 * iscsi_destroy_session - destroy iscsi session
881 * @session: iscsi_session
882 *
883 * Can be called by a LLD or iscsi_transport. There must not be
884 * any running connections.
885 */
886 int iscsi_destroy_session(struct iscsi_cls_session *session)
887 {
888 iscsi_remove_session(session);
889 ISCSI_DBG_TRANS_SESSION(session, "Completing session destruction\n");
890 iscsi_free_session(session);
891 return 0;
892 }
893 EXPORT_SYMBOL_GPL(iscsi_destroy_session);
894
895 /**
896 * iscsi_create_conn - create iscsi class connection
897 * @session: iscsi cls session
898 * @dd_size: private driver data size
899 * @cid: connection id
900 *
901 * This can be called from a LLD or iscsi_transport. The connection
902 * is child of the session so cid must be unique for all connections
903 * on the session.
904 *
905 * Since we do not support MCS, cid will normally be zero. In some cases
906 * for software iscsi we could be trying to preallocate a connection struct
907 * in which case there could be two connection structs and cid would be
908 * non-zero.
909 */
910 struct iscsi_cls_conn *
911 iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
912 {
913 struct iscsi_transport *transport = session->transport;
914 struct iscsi_cls_conn *conn;
915 unsigned long flags;
916 int err;
917
918 conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
919 if (!conn)
920 return NULL;
921 if (dd_size)
922 conn->dd_data = &conn[1];
923
924 INIT_LIST_HEAD(&conn->conn_list);
925 conn->transport = transport;
926 conn->cid = cid;
927
928 /* this is released in the dev's release function */
929 if (!get_device(&session->dev))
930 goto free_conn;
931
932 dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
933 conn->dev.parent = &session->dev;
934 conn->dev.release = iscsi_conn_release;
935 err = device_register(&conn->dev);
936 if (err) {
937 iscsi_cls_session_printk(KERN_ERR, session, "could not "
938 "register connection's dev\n");
939 goto release_parent_ref;
940 }
941 transport_register_device(&conn->dev);
942
943 spin_lock_irqsave(&connlock, flags);
944 list_add(&conn->conn_list, &connlist);
945 conn->active = 1;
946 spin_unlock_irqrestore(&connlock, flags);
947
948 ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
949 return conn;
950
951 release_parent_ref:
952 put_device(&session->dev);
953 free_conn:
954 kfree(conn);
955 return NULL;
956 }
957
958 EXPORT_SYMBOL_GPL(iscsi_create_conn);
959
960 /**
961 * iscsi_destroy_conn - destroy iscsi class connection
962 * @conn: iscsi cls session
963 *
964 * This can be called from a LLD or iscsi_transport.
965 */
966 int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
967 {
968 unsigned long flags;
969
970 spin_lock_irqsave(&connlock, flags);
971 conn->active = 0;
972 list_del(&conn->conn_list);
973 spin_unlock_irqrestore(&connlock, flags);
974
975 transport_unregister_device(&conn->dev);
976 ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n");
977 device_unregister(&conn->dev);
978 return 0;
979 }
980 EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
981
982 /*
983 * iscsi interface functions
984 */
985 static struct iscsi_internal *
986 iscsi_if_transport_lookup(struct iscsi_transport *tt)
987 {
988 struct iscsi_internal *priv;
989 unsigned long flags;
990
991 spin_lock_irqsave(&iscsi_transport_lock, flags);
992 list_for_each_entry(priv, &iscsi_transports, list) {
993 if (tt == priv->iscsi_transport) {
994 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
995 return priv;
996 }
997 }
998 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
999 return NULL;
1000 }
1001
1002 static int
1003 iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
1004 {
1005 return nlmsg_multicast(nls, skb, 0, group, gfp);
1006 }
1007
1008 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
1009 char *data, uint32_t data_size)
1010 {
1011 struct nlmsghdr *nlh;
1012 struct sk_buff *skb;
1013 struct iscsi_uevent *ev;
1014 char *pdu;
1015 struct iscsi_internal *priv;
1016 int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) +
1017 data_size);
1018
1019 priv = iscsi_if_transport_lookup(conn->transport);
1020 if (!priv)
1021 return -EINVAL;
1022
1023 skb = alloc_skb(len, GFP_ATOMIC);
1024 if (!skb) {
1025 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
1026 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
1027 "control PDU: OOM\n");
1028 return -ENOMEM;
1029 }
1030
1031 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1032 ev = NLMSG_DATA(nlh);
1033 memset(ev, 0, sizeof(*ev));
1034 ev->transport_handle = iscsi_handle(conn->transport);
1035 ev->type = ISCSI_KEVENT_RECV_PDU;
1036 ev->r.recv_req.cid = conn->cid;
1037 ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
1038 pdu = (char*)ev + sizeof(*ev);
1039 memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
1040 memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
1041
1042 return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1043 }
1044 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
1045
1046 int iscsi_offload_mesg(struct Scsi_Host *shost,
1047 struct iscsi_transport *transport, uint32_t type,
1048 char *data, uint16_t data_size)
1049 {
1050 struct nlmsghdr *nlh;
1051 struct sk_buff *skb;
1052 struct iscsi_uevent *ev;
1053 int len = NLMSG_SPACE(sizeof(*ev) + data_size);
1054
1055 skb = alloc_skb(len, GFP_ATOMIC);
1056 if (!skb) {
1057 printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
1058 return -ENOMEM;
1059 }
1060
1061 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1062 ev = NLMSG_DATA(nlh);
1063 memset(ev, 0, sizeof(*ev));
1064 ev->type = type;
1065 ev->transport_handle = iscsi_handle(transport);
1066 switch (type) {
1067 case ISCSI_KEVENT_PATH_REQ:
1068 ev->r.req_path.host_no = shost->host_no;
1069 break;
1070 case ISCSI_KEVENT_IF_DOWN:
1071 ev->r.notify_if_down.host_no = shost->host_no;
1072 break;
1073 }
1074
1075 memcpy((char *)ev + sizeof(*ev), data, data_size);
1076
1077 return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
1078 }
1079 EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
1080
1081 void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
1082 {
1083 struct nlmsghdr *nlh;
1084 struct sk_buff *skb;
1085 struct iscsi_uevent *ev;
1086 struct iscsi_internal *priv;
1087 int len = NLMSG_SPACE(sizeof(*ev));
1088
1089 priv = iscsi_if_transport_lookup(conn->transport);
1090 if (!priv)
1091 return;
1092
1093 skb = alloc_skb(len, GFP_ATOMIC);
1094 if (!skb) {
1095 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
1096 "conn error (%d)\n", error);
1097 return;
1098 }
1099
1100 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1101 ev = NLMSG_DATA(nlh);
1102 ev->transport_handle = iscsi_handle(conn->transport);
1103 ev->type = ISCSI_KEVENT_CONN_ERROR;
1104 ev->r.connerror.error = error;
1105 ev->r.connerror.cid = conn->cid;
1106 ev->r.connerror.sid = iscsi_conn_get_sid(conn);
1107
1108 iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1109
1110 iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
1111 error);
1112 }
1113 EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
1114
1115 static int
1116 iscsi_if_send_reply(uint32_t group, int seq, int type, int done, int multi,
1117 void *payload, int size)
1118 {
1119 struct sk_buff *skb;
1120 struct nlmsghdr *nlh;
1121 int len = NLMSG_SPACE(size);
1122 int flags = multi ? NLM_F_MULTI : 0;
1123 int t = done ? NLMSG_DONE : type;
1124
1125 skb = alloc_skb(len, GFP_ATOMIC);
1126 if (!skb) {
1127 printk(KERN_ERR "Could not allocate skb to send reply.\n");
1128 return -ENOMEM;
1129 }
1130
1131 nlh = __nlmsg_put(skb, 0, 0, t, (len - sizeof(*nlh)), 0);
1132 nlh->nlmsg_flags = flags;
1133 memcpy(NLMSG_DATA(nlh), payload, size);
1134 return iscsi_multicast_skb(skb, group, GFP_ATOMIC);
1135 }
1136
1137 static int
1138 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
1139 {
1140 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1141 struct iscsi_stats *stats;
1142 struct sk_buff *skbstat;
1143 struct iscsi_cls_conn *conn;
1144 struct nlmsghdr *nlhstat;
1145 struct iscsi_uevent *evstat;
1146 struct iscsi_internal *priv;
1147 int len = NLMSG_SPACE(sizeof(*ev) +
1148 sizeof(struct iscsi_stats) +
1149 sizeof(struct iscsi_stats_custom) *
1150 ISCSI_STATS_CUSTOM_MAX);
1151 int err = 0;
1152
1153 priv = iscsi_if_transport_lookup(transport);
1154 if (!priv)
1155 return -EINVAL;
1156
1157 conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
1158 if (!conn)
1159 return -EEXIST;
1160
1161 do {
1162 int actual_size;
1163
1164 skbstat = alloc_skb(len, GFP_ATOMIC);
1165 if (!skbstat) {
1166 iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
1167 "deliver stats: OOM\n");
1168 return -ENOMEM;
1169 }
1170
1171 nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
1172 (len - sizeof(*nlhstat)), 0);
1173 evstat = NLMSG_DATA(nlhstat);
1174 memset(evstat, 0, sizeof(*evstat));
1175 evstat->transport_handle = iscsi_handle(conn->transport);
1176 evstat->type = nlh->nlmsg_type;
1177 evstat->u.get_stats.cid =
1178 ev->u.get_stats.cid;
1179 evstat->u.get_stats.sid =
1180 ev->u.get_stats.sid;
1181 stats = (struct iscsi_stats *)
1182 ((char*)evstat + sizeof(*evstat));
1183 memset(stats, 0, sizeof(*stats));
1184
1185 transport->get_stats(conn, stats);
1186 actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) +
1187 sizeof(struct iscsi_stats) +
1188 sizeof(struct iscsi_stats_custom) *
1189 stats->custom_length);
1190 actual_size -= sizeof(*nlhstat);
1191 actual_size = NLMSG_LENGTH(actual_size);
1192 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
1193 nlhstat->nlmsg_len = actual_size;
1194
1195 err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
1196 GFP_ATOMIC);
1197 } while (err < 0 && err != -ECONNREFUSED);
1198
1199 return err;
1200 }
1201
1202 /**
1203 * iscsi_session_event - send session destr. completion event
1204 * @session: iscsi class session
1205 * @event: type of event
1206 */
1207 int iscsi_session_event(struct iscsi_cls_session *session,
1208 enum iscsi_uevent_e event)
1209 {
1210 struct iscsi_internal *priv;
1211 struct Scsi_Host *shost;
1212 struct iscsi_uevent *ev;
1213 struct sk_buff *skb;
1214 struct nlmsghdr *nlh;
1215 int rc, len = NLMSG_SPACE(sizeof(*ev));
1216
1217 priv = iscsi_if_transport_lookup(session->transport);
1218 if (!priv)
1219 return -EINVAL;
1220 shost = iscsi_session_to_shost(session);
1221
1222 skb = alloc_skb(len, GFP_KERNEL);
1223 if (!skb) {
1224 iscsi_cls_session_printk(KERN_ERR, session,
1225 "Cannot notify userspace of session "
1226 "event %u\n", event);
1227 return -ENOMEM;
1228 }
1229
1230 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1231 ev = NLMSG_DATA(nlh);
1232 ev->transport_handle = iscsi_handle(session->transport);
1233
1234 ev->type = event;
1235 switch (event) {
1236 case ISCSI_KEVENT_DESTROY_SESSION:
1237 ev->r.d_session.host_no = shost->host_no;
1238 ev->r.d_session.sid = session->sid;
1239 break;
1240 case ISCSI_KEVENT_CREATE_SESSION:
1241 ev->r.c_session_ret.host_no = shost->host_no;
1242 ev->r.c_session_ret.sid = session->sid;
1243 break;
1244 case ISCSI_KEVENT_UNBIND_SESSION:
1245 ev->r.unbind_session.host_no = shost->host_no;
1246 ev->r.unbind_session.sid = session->sid;
1247 break;
1248 default:
1249 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
1250 "%u.\n", event);
1251 kfree_skb(skb);
1252 return -EINVAL;
1253 }
1254
1255 /*
1256 * this will occur if the daemon is not up, so we just warn
1257 * the user and when the daemon is restarted it will handle it
1258 */
1259 rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
1260 if (rc == -ESRCH)
1261 iscsi_cls_session_printk(KERN_ERR, session,
1262 "Cannot notify userspace of session "
1263 "event %u. Check iscsi daemon\n",
1264 event);
1265
1266 ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
1267 event, rc);
1268 return rc;
1269 }
1270 EXPORT_SYMBOL_GPL(iscsi_session_event);
1271
1272 static int
1273 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
1274 struct iscsi_uevent *ev, uint32_t initial_cmdsn,
1275 uint16_t cmds_max, uint16_t queue_depth)
1276 {
1277 struct iscsi_transport *transport = priv->iscsi_transport;
1278 struct iscsi_cls_session *session;
1279 struct Scsi_Host *shost;
1280
1281 session = transport->create_session(ep, cmds_max, queue_depth,
1282 initial_cmdsn);
1283 if (!session)
1284 return -ENOMEM;
1285
1286 shost = iscsi_session_to_shost(session);
1287 ev->r.c_session_ret.host_no = shost->host_no;
1288 ev->r.c_session_ret.sid = session->sid;
1289 ISCSI_DBG_TRANS_SESSION(session,
1290 "Completed creating transport session\n");
1291 return 0;
1292 }
1293
1294 static int
1295 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1296 {
1297 struct iscsi_cls_conn *conn;
1298 struct iscsi_cls_session *session;
1299
1300 session = iscsi_session_lookup(ev->u.c_conn.sid);
1301 if (!session) {
1302 printk(KERN_ERR "iscsi: invalid session %d.\n",
1303 ev->u.c_conn.sid);
1304 return -EINVAL;
1305 }
1306
1307 conn = transport->create_conn(session, ev->u.c_conn.cid);
1308 if (!conn) {
1309 iscsi_cls_session_printk(KERN_ERR, session,
1310 "couldn't create a new connection.");
1311 return -ENOMEM;
1312 }
1313
1314 ev->r.c_conn_ret.sid = session->sid;
1315 ev->r.c_conn_ret.cid = conn->cid;
1316
1317 ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
1318 return 0;
1319 }
1320
1321 static int
1322 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1323 {
1324 struct iscsi_cls_conn *conn;
1325
1326 conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
1327 if (!conn)
1328 return -EINVAL;
1329
1330 ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
1331 if (transport->destroy_conn)
1332 transport->destroy_conn(conn);
1333
1334 return 0;
1335 }
1336
1337 static int
1338 iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1339 {
1340 char *data = (char*)ev + sizeof(*ev);
1341 struct iscsi_cls_conn *conn;
1342 struct iscsi_cls_session *session;
1343 int err = 0, value = 0;
1344
1345 session = iscsi_session_lookup(ev->u.set_param.sid);
1346 conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
1347 if (!conn || !session)
1348 return -EINVAL;
1349
1350 switch (ev->u.set_param.param) {
1351 case ISCSI_PARAM_SESS_RECOVERY_TMO:
1352 sscanf(data, "%d", &value);
1353 session->recovery_tmo = value;
1354 break;
1355 default:
1356 err = transport->set_param(conn, ev->u.set_param.param,
1357 data, ev->u.set_param.len);
1358 }
1359
1360 return err;
1361 }
1362
1363 static int iscsi_if_ep_connect(struct iscsi_transport *transport,
1364 struct iscsi_uevent *ev, int msg_type)
1365 {
1366 struct iscsi_endpoint *ep;
1367 struct sockaddr *dst_addr;
1368 struct Scsi_Host *shost = NULL;
1369 int non_blocking, err = 0;
1370
1371 if (!transport->ep_connect)
1372 return -EINVAL;
1373
1374 if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
1375 shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
1376 if (!shost) {
1377 printk(KERN_ERR "ep connect failed. Could not find "
1378 "host no %u\n",
1379 ev->u.ep_connect_through_host.host_no);
1380 return -ENODEV;
1381 }
1382 non_blocking = ev->u.ep_connect_through_host.non_blocking;
1383 } else
1384 non_blocking = ev->u.ep_connect.non_blocking;
1385
1386 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1387 ep = transport->ep_connect(shost, dst_addr, non_blocking);
1388 if (IS_ERR(ep)) {
1389 err = PTR_ERR(ep);
1390 goto release_host;
1391 }
1392
1393 ev->r.ep_connect_ret.handle = ep->id;
1394 release_host:
1395 if (shost)
1396 scsi_host_put(shost);
1397 return err;
1398 }
1399
1400 static int
1401 iscsi_if_transport_ep(struct iscsi_transport *transport,
1402 struct iscsi_uevent *ev, int msg_type)
1403 {
1404 struct iscsi_endpoint *ep;
1405 int rc = 0;
1406
1407 switch (msg_type) {
1408 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
1409 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1410 rc = iscsi_if_ep_connect(transport, ev, msg_type);
1411 break;
1412 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1413 if (!transport->ep_poll)
1414 return -EINVAL;
1415
1416 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
1417 if (!ep)
1418 return -EINVAL;
1419
1420 ev->r.retcode = transport->ep_poll(ep,
1421 ev->u.ep_poll.timeout_ms);
1422 break;
1423 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1424 if (!transport->ep_disconnect)
1425 return -EINVAL;
1426
1427 ep = iscsi_lookup_endpoint(ev->u.ep_disconnect.ep_handle);
1428 if (!ep)
1429 return -EINVAL;
1430
1431 transport->ep_disconnect(ep);
1432 break;
1433 }
1434 return rc;
1435 }
1436
1437 static int
1438 iscsi_tgt_dscvr(struct iscsi_transport *transport,
1439 struct iscsi_uevent *ev)
1440 {
1441 struct Scsi_Host *shost;
1442 struct sockaddr *dst_addr;
1443 int err;
1444
1445 if (!transport->tgt_dscvr)
1446 return -EINVAL;
1447
1448 shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
1449 if (!shost) {
1450 printk(KERN_ERR "target discovery could not find host no %u\n",
1451 ev->u.tgt_dscvr.host_no);
1452 return -ENODEV;
1453 }
1454
1455
1456 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1457 err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
1458 ev->u.tgt_dscvr.enable, dst_addr);
1459 scsi_host_put(shost);
1460 return err;
1461 }
1462
1463 static int
1464 iscsi_set_host_param(struct iscsi_transport *transport,
1465 struct iscsi_uevent *ev)
1466 {
1467 char *data = (char*)ev + sizeof(*ev);
1468 struct Scsi_Host *shost;
1469 int err;
1470
1471 if (!transport->set_host_param)
1472 return -ENOSYS;
1473
1474 shost = scsi_host_lookup(ev->u.set_host_param.host_no);
1475 if (!shost) {
1476 printk(KERN_ERR "set_host_param could not find host no %u\n",
1477 ev->u.set_host_param.host_no);
1478 return -ENODEV;
1479 }
1480
1481 err = transport->set_host_param(shost, ev->u.set_host_param.param,
1482 data, ev->u.set_host_param.len);
1483 scsi_host_put(shost);
1484 return err;
1485 }
1486
1487 static int
1488 iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1489 {
1490 struct Scsi_Host *shost;
1491 struct iscsi_path *params;
1492 int err;
1493
1494 if (!transport->set_path)
1495 return -ENOSYS;
1496
1497 shost = scsi_host_lookup(ev->u.set_path.host_no);
1498 if (!shost) {
1499 printk(KERN_ERR "set path could not find host no %u\n",
1500 ev->u.set_path.host_no);
1501 return -ENODEV;
1502 }
1503
1504 params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
1505 err = transport->set_path(shost, params);
1506
1507 scsi_host_put(shost);
1508 return err;
1509 }
1510
1511 static int
1512 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
1513 {
1514 int err = 0;
1515 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1516 struct iscsi_transport *transport = NULL;
1517 struct iscsi_internal *priv;
1518 struct iscsi_cls_session *session;
1519 struct iscsi_cls_conn *conn;
1520 struct iscsi_endpoint *ep = NULL;
1521
1522 if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
1523 *group = ISCSI_NL_GRP_UIP;
1524 else
1525 *group = ISCSI_NL_GRP_ISCSID;
1526
1527 priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
1528 if (!priv)
1529 return -EINVAL;
1530 transport = priv->iscsi_transport;
1531
1532 if (!try_module_get(transport->owner))
1533 return -EINVAL;
1534
1535 switch (nlh->nlmsg_type) {
1536 case ISCSI_UEVENT_CREATE_SESSION:
1537 err = iscsi_if_create_session(priv, ep, ev,
1538 ev->u.c_session.initial_cmdsn,
1539 ev->u.c_session.cmds_max,
1540 ev->u.c_session.queue_depth);
1541 break;
1542 case ISCSI_UEVENT_CREATE_BOUND_SESSION:
1543 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
1544 if (!ep) {
1545 err = -EINVAL;
1546 break;
1547 }
1548
1549 err = iscsi_if_create_session(priv, ep, ev,
1550 ev->u.c_bound_session.initial_cmdsn,
1551 ev->u.c_bound_session.cmds_max,
1552 ev->u.c_bound_session.queue_depth);
1553 break;
1554 case ISCSI_UEVENT_DESTROY_SESSION:
1555 session = iscsi_session_lookup(ev->u.d_session.sid);
1556 if (session)
1557 transport->destroy_session(session);
1558 else
1559 err = -EINVAL;
1560 break;
1561 case ISCSI_UEVENT_UNBIND_SESSION:
1562 session = iscsi_session_lookup(ev->u.d_session.sid);
1563 if (session)
1564 scsi_queue_work(iscsi_session_to_shost(session),
1565 &session->unbind_work);
1566 else
1567 err = -EINVAL;
1568 break;
1569 case ISCSI_UEVENT_CREATE_CONN:
1570 err = iscsi_if_create_conn(transport, ev);
1571 break;
1572 case ISCSI_UEVENT_DESTROY_CONN:
1573 err = iscsi_if_destroy_conn(transport, ev);
1574 break;
1575 case ISCSI_UEVENT_BIND_CONN:
1576 session = iscsi_session_lookup(ev->u.b_conn.sid);
1577 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
1578
1579 if (session && conn)
1580 ev->r.retcode = transport->bind_conn(session, conn,
1581 ev->u.b_conn.transport_eph,
1582 ev->u.b_conn.is_leading);
1583 else
1584 err = -EINVAL;
1585 break;
1586 case ISCSI_UEVENT_SET_PARAM:
1587 err = iscsi_set_param(transport, ev);
1588 break;
1589 case ISCSI_UEVENT_START_CONN:
1590 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
1591 if (conn)
1592 ev->r.retcode = transport->start_conn(conn);
1593 else
1594 err = -EINVAL;
1595 break;
1596 case ISCSI_UEVENT_STOP_CONN:
1597 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
1598 if (conn)
1599 transport->stop_conn(conn, ev->u.stop_conn.flag);
1600 else
1601 err = -EINVAL;
1602 break;
1603 case ISCSI_UEVENT_SEND_PDU:
1604 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
1605 if (conn)
1606 ev->r.retcode = transport->send_pdu(conn,
1607 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
1608 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
1609 ev->u.send_pdu.data_size);
1610 else
1611 err = -EINVAL;
1612 break;
1613 case ISCSI_UEVENT_GET_STATS:
1614 err = iscsi_if_get_stats(transport, nlh);
1615 break;
1616 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1617 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1618 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1619 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
1620 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
1621 break;
1622 case ISCSI_UEVENT_TGT_DSCVR:
1623 err = iscsi_tgt_dscvr(transport, ev);
1624 break;
1625 case ISCSI_UEVENT_SET_HOST_PARAM:
1626 err = iscsi_set_host_param(transport, ev);
1627 break;
1628 case ISCSI_UEVENT_PATH_UPDATE:
1629 err = iscsi_set_path(transport, ev);
1630 break;
1631 default:
1632 err = -ENOSYS;
1633 break;
1634 }
1635
1636 module_put(transport->owner);
1637 return err;
1638 }
1639
1640 /*
1641 * Get message from skb. Each message is processed by iscsi_if_recv_msg.
1642 * Malformed skbs with wrong lengths or invalid creds are not processed.
1643 */
1644 static void
1645 iscsi_if_rx(struct sk_buff *skb)
1646 {
1647 mutex_lock(&rx_queue_mutex);
1648 while (skb->len >= NLMSG_SPACE(0)) {
1649 int err;
1650 uint32_t rlen;
1651 struct nlmsghdr *nlh;
1652 struct iscsi_uevent *ev;
1653 uint32_t group;
1654
1655 nlh = nlmsg_hdr(skb);
1656 if (nlh->nlmsg_len < sizeof(*nlh) ||
1657 skb->len < nlh->nlmsg_len) {
1658 break;
1659 }
1660
1661 ev = NLMSG_DATA(nlh);
1662 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
1663 if (rlen > skb->len)
1664 rlen = skb->len;
1665
1666 err = iscsi_if_recv_msg(skb, nlh, &group);
1667 if (err) {
1668 ev->type = ISCSI_KEVENT_IF_ERROR;
1669 ev->iferror = err;
1670 }
1671 do {
1672 /*
1673 * special case for GET_STATS:
1674 * on success - sending reply and stats from
1675 * inside of if_recv_msg(),
1676 * on error - fall through.
1677 */
1678 if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
1679 break;
1680 err = iscsi_if_send_reply(group, nlh->nlmsg_seq,
1681 nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
1682 } while (err < 0 && err != -ECONNREFUSED);
1683 skb_pull(skb, rlen);
1684 }
1685 mutex_unlock(&rx_queue_mutex);
1686 }
1687
1688 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \
1689 struct device_attribute dev_attr_##_prefix##_##_name = \
1690 __ATTR(_name,_mode,_show,_store)
1691
1692 /*
1693 * iSCSI connection attrs
1694 */
1695 #define iscsi_conn_attr_show(param) \
1696 static ssize_t \
1697 show_conn_param_##param(struct device *dev, \
1698 struct device_attribute *attr, char *buf) \
1699 { \
1700 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \
1701 struct iscsi_transport *t = conn->transport; \
1702 return t->get_conn_param(conn, param, buf); \
1703 }
1704
1705 #define iscsi_conn_attr(field, param) \
1706 iscsi_conn_attr_show(param) \
1707 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param, \
1708 NULL);
1709
1710 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
1711 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
1712 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
1713 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
1714 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
1715 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
1716 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
1717 iscsi_conn_attr(port, ISCSI_PARAM_CONN_PORT);
1718 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
1719 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
1720 iscsi_conn_attr(address, ISCSI_PARAM_CONN_ADDRESS);
1721 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
1722 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
1723
1724 /*
1725 * iSCSI session attrs
1726 */
1727 #define iscsi_session_attr_show(param, perm) \
1728 static ssize_t \
1729 show_session_param_##param(struct device *dev, \
1730 struct device_attribute *attr, char *buf) \
1731 { \
1732 struct iscsi_cls_session *session = \
1733 iscsi_dev_to_session(dev->parent); \
1734 struct iscsi_transport *t = session->transport; \
1735 \
1736 if (perm && !capable(CAP_SYS_ADMIN)) \
1737 return -EACCES; \
1738 return t->get_session_param(session, param, buf); \
1739 }
1740
1741 #define iscsi_session_attr(field, param, perm) \
1742 iscsi_session_attr_show(param, perm) \
1743 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
1744 NULL);
1745
1746 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
1747 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
1748 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
1749 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
1750 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
1751 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
1752 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
1753 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
1754 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
1755 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
1756 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
1757 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
1758 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
1759 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
1760 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
1761 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
1762 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
1763 iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
1764 iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
1765 iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0)
1766
1767 static ssize_t
1768 show_priv_session_state(struct device *dev, struct device_attribute *attr,
1769 char *buf)
1770 {
1771 struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
1772 return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
1773 }
1774 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
1775 NULL);
1776
1777 #define iscsi_priv_session_attr_show(field, format) \
1778 static ssize_t \
1779 show_priv_session_##field(struct device *dev, \
1780 struct device_attribute *attr, char *buf) \
1781 { \
1782 struct iscsi_cls_session *session = \
1783 iscsi_dev_to_session(dev->parent); \
1784 return sprintf(buf, format"\n", session->field); \
1785 }
1786
1787 #define iscsi_priv_session_attr(field, format) \
1788 iscsi_priv_session_attr_show(field, format) \
1789 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO, show_priv_session_##field, \
1790 NULL)
1791 iscsi_priv_session_attr(recovery_tmo, "%d");
1792
1793 /*
1794 * iSCSI host attrs
1795 */
1796 #define iscsi_host_attr_show(param) \
1797 static ssize_t \
1798 show_host_param_##param(struct device *dev, \
1799 struct device_attribute *attr, char *buf) \
1800 { \
1801 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1802 struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
1803 return priv->iscsi_transport->get_host_param(shost, param, buf); \
1804 }
1805
1806 #define iscsi_host_attr(field, param) \
1807 iscsi_host_attr_show(param) \
1808 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param, \
1809 NULL);
1810
1811 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
1812 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
1813 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
1814 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
1815
1816 #define SETUP_PRIV_SESSION_RD_ATTR(field) \
1817 do { \
1818 priv->session_attrs[count] = &dev_attr_priv_sess_##field; \
1819 count++; \
1820 } while (0)
1821
1822
1823 #define SETUP_SESSION_RD_ATTR(field, param_flag) \
1824 do { \
1825 if (tt->param_mask & param_flag) { \
1826 priv->session_attrs[count] = &dev_attr_sess_##field; \
1827 count++; \
1828 } \
1829 } while (0)
1830
1831 #define SETUP_CONN_RD_ATTR(field, param_flag) \
1832 do { \
1833 if (tt->param_mask & param_flag) { \
1834 priv->conn_attrs[count] = &dev_attr_conn_##field; \
1835 count++; \
1836 } \
1837 } while (0)
1838
1839 #define SETUP_HOST_RD_ATTR(field, param_flag) \
1840 do { \
1841 if (tt->host_param_mask & param_flag) { \
1842 priv->host_attrs[count] = &dev_attr_host_##field; \
1843 count++; \
1844 } \
1845 } while (0)
1846
1847 static int iscsi_session_match(struct attribute_container *cont,
1848 struct device *dev)
1849 {
1850 struct iscsi_cls_session *session;
1851 struct Scsi_Host *shost;
1852 struct iscsi_internal *priv;
1853
1854 if (!iscsi_is_session_dev(dev))
1855 return 0;
1856
1857 session = iscsi_dev_to_session(dev);
1858 shost = iscsi_session_to_shost(session);
1859 if (!shost->transportt)
1860 return 0;
1861
1862 priv = to_iscsi_internal(shost->transportt);
1863 if (priv->session_cont.ac.class != &iscsi_session_class.class)
1864 return 0;
1865
1866 return &priv->session_cont.ac == cont;
1867 }
1868
1869 static int iscsi_conn_match(struct attribute_container *cont,
1870 struct device *dev)
1871 {
1872 struct iscsi_cls_session *session;
1873 struct iscsi_cls_conn *conn;
1874 struct Scsi_Host *shost;
1875 struct iscsi_internal *priv;
1876
1877 if (!iscsi_is_conn_dev(dev))
1878 return 0;
1879
1880 conn = iscsi_dev_to_conn(dev);
1881 session = iscsi_dev_to_session(conn->dev.parent);
1882 shost = iscsi_session_to_shost(session);
1883
1884 if (!shost->transportt)
1885 return 0;
1886
1887 priv = to_iscsi_internal(shost->transportt);
1888 if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
1889 return 0;
1890
1891 return &priv->conn_cont.ac == cont;
1892 }
1893
1894 static int iscsi_host_match(struct attribute_container *cont,
1895 struct device *dev)
1896 {
1897 struct Scsi_Host *shost;
1898 struct iscsi_internal *priv;
1899
1900 if (!scsi_is_host_device(dev))
1901 return 0;
1902
1903 shost = dev_to_shost(dev);
1904 if (!shost->transportt ||
1905 shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
1906 return 0;
1907
1908 priv = to_iscsi_internal(shost->transportt);
1909 return &priv->t.host_attrs.ac == cont;
1910 }
1911
1912 struct scsi_transport_template *
1913 iscsi_register_transport(struct iscsi_transport *tt)
1914 {
1915 struct iscsi_internal *priv;
1916 unsigned long flags;
1917 int count = 0, err;
1918
1919 BUG_ON(!tt);
1920
1921 priv = iscsi_if_transport_lookup(tt);
1922 if (priv)
1923 return NULL;
1924
1925 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1926 if (!priv)
1927 return NULL;
1928 INIT_LIST_HEAD(&priv->list);
1929 priv->iscsi_transport = tt;
1930 priv->t.user_scan = iscsi_user_scan;
1931 priv->t.create_work_queue = 1;
1932
1933 priv->dev.class = &iscsi_transport_class;
1934 dev_set_name(&priv->dev, "%s", tt->name);
1935 err = device_register(&priv->dev);
1936 if (err)
1937 goto free_priv;
1938
1939 err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
1940 if (err)
1941 goto unregister_dev;
1942
1943 /* host parameters */
1944 priv->t.host_attrs.ac.attrs = &priv->host_attrs[0];
1945 priv->t.host_attrs.ac.class = &iscsi_host_class.class;
1946 priv->t.host_attrs.ac.match = iscsi_host_match;
1947 priv->t.host_size = sizeof(struct iscsi_cls_host);
1948 transport_container_register(&priv->t.host_attrs);
1949
1950 SETUP_HOST_RD_ATTR(netdev, ISCSI_HOST_NETDEV_NAME);
1951 SETUP_HOST_RD_ATTR(ipaddress, ISCSI_HOST_IPADDRESS);
1952 SETUP_HOST_RD_ATTR(hwaddress, ISCSI_HOST_HWADDRESS);
1953 SETUP_HOST_RD_ATTR(initiatorname, ISCSI_HOST_INITIATOR_NAME);
1954 BUG_ON(count > ISCSI_HOST_ATTRS);
1955 priv->host_attrs[count] = NULL;
1956 count = 0;
1957
1958 /* connection parameters */
1959 priv->conn_cont.ac.attrs = &priv->conn_attrs[0];
1960 priv->conn_cont.ac.class = &iscsi_connection_class.class;
1961 priv->conn_cont.ac.match = iscsi_conn_match;
1962 transport_container_register(&priv->conn_cont);
1963
1964 SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_MAX_RECV_DLENGTH);
1965 SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_MAX_XMIT_DLENGTH);
1966 SETUP_CONN_RD_ATTR(header_digest, ISCSI_HDRDGST_EN);
1967 SETUP_CONN_RD_ATTR(data_digest, ISCSI_DATADGST_EN);
1968 SETUP_CONN_RD_ATTR(ifmarker, ISCSI_IFMARKER_EN);
1969 SETUP_CONN_RD_ATTR(ofmarker, ISCSI_OFMARKER_EN);
1970 SETUP_CONN_RD_ATTR(address, ISCSI_CONN_ADDRESS);
1971 SETUP_CONN_RD_ATTR(port, ISCSI_CONN_PORT);
1972 SETUP_CONN_RD_ATTR(exp_statsn, ISCSI_EXP_STATSN);
1973 SETUP_CONN_RD_ATTR(persistent_address, ISCSI_PERSISTENT_ADDRESS);
1974 SETUP_CONN_RD_ATTR(persistent_port, ISCSI_PERSISTENT_PORT);
1975 SETUP_CONN_RD_ATTR(ping_tmo, ISCSI_PING_TMO);
1976 SETUP_CONN_RD_ATTR(recv_tmo, ISCSI_RECV_TMO);
1977
1978 BUG_ON(count > ISCSI_CONN_ATTRS);
1979 priv->conn_attrs[count] = NULL;
1980 count = 0;
1981
1982 /* session parameters */
1983 priv->session_cont.ac.attrs = &priv->session_attrs[0];
1984 priv->session_cont.ac.class = &iscsi_session_class.class;
1985 priv->session_cont.ac.match = iscsi_session_match;
1986 transport_container_register(&priv->session_cont);
1987
1988 SETUP_SESSION_RD_ATTR(initial_r2t, ISCSI_INITIAL_R2T_EN);
1989 SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_MAX_R2T);
1990 SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_IMM_DATA_EN);
1991 SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_FIRST_BURST);
1992 SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_MAX_BURST);
1993 SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PDU_INORDER_EN);
1994 SETUP_SESSION_RD_ATTR(data_seq_in_order, ISCSI_DATASEQ_INORDER_EN);
1995 SETUP_SESSION_RD_ATTR(erl, ISCSI_ERL);
1996 SETUP_SESSION_RD_ATTR(targetname, ISCSI_TARGET_NAME);
1997 SETUP_SESSION_RD_ATTR(tpgt, ISCSI_TPGT);
1998 SETUP_SESSION_RD_ATTR(password, ISCSI_USERNAME);
1999 SETUP_SESSION_RD_ATTR(password_in, ISCSI_USERNAME_IN);
2000 SETUP_SESSION_RD_ATTR(username, ISCSI_PASSWORD);
2001 SETUP_SESSION_RD_ATTR(username_in, ISCSI_PASSWORD_IN);
2002 SETUP_SESSION_RD_ATTR(fast_abort, ISCSI_FAST_ABORT);
2003 SETUP_SESSION_RD_ATTR(abort_tmo, ISCSI_ABORT_TMO);
2004 SETUP_SESSION_RD_ATTR(lu_reset_tmo,ISCSI_LU_RESET_TMO);
2005 SETUP_SESSION_RD_ATTR(tgt_reset_tmo,ISCSI_TGT_RESET_TMO);
2006 SETUP_SESSION_RD_ATTR(ifacename, ISCSI_IFACE_NAME);
2007 SETUP_SESSION_RD_ATTR(initiatorname, ISCSI_INITIATOR_NAME);
2008 SETUP_PRIV_SESSION_RD_ATTR(recovery_tmo);
2009 SETUP_PRIV_SESSION_RD_ATTR(state);
2010
2011 BUG_ON(count > ISCSI_SESSION_ATTRS);
2012 priv->session_attrs[count] = NULL;
2013
2014 spin_lock_irqsave(&iscsi_transport_lock, flags);
2015 list_add(&priv->list, &iscsi_transports);
2016 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2017
2018 printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
2019 return &priv->t;
2020
2021 unregister_dev:
2022 device_unregister(&priv->dev);
2023 return NULL;
2024 free_priv:
2025 kfree(priv);
2026 return NULL;
2027 }
2028 EXPORT_SYMBOL_GPL(iscsi_register_transport);
2029
2030 int iscsi_unregister_transport(struct iscsi_transport *tt)
2031 {
2032 struct iscsi_internal *priv;
2033 unsigned long flags;
2034
2035 BUG_ON(!tt);
2036
2037 mutex_lock(&rx_queue_mutex);
2038
2039 priv = iscsi_if_transport_lookup(tt);
2040 BUG_ON (!priv);
2041
2042 spin_lock_irqsave(&iscsi_transport_lock, flags);
2043 list_del(&priv->list);
2044 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2045
2046 transport_container_unregister(&priv->conn_cont);
2047 transport_container_unregister(&priv->session_cont);
2048 transport_container_unregister(&priv->t.host_attrs);
2049
2050 sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
2051 device_unregister(&priv->dev);
2052 mutex_unlock(&rx_queue_mutex);
2053
2054 return 0;
2055 }
2056 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
2057
2058 static __init int iscsi_transport_init(void)
2059 {
2060 int err;
2061
2062 printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
2063 ISCSI_TRANSPORT_VERSION);
2064
2065 atomic_set(&iscsi_session_nr, 0);
2066
2067 err = class_register(&iscsi_transport_class);
2068 if (err)
2069 return err;
2070
2071 err = class_register(&iscsi_endpoint_class);
2072 if (err)
2073 goto unregister_transport_class;
2074
2075 err = transport_class_register(&iscsi_host_class);
2076 if (err)
2077 goto unregister_endpoint_class;
2078
2079 err = transport_class_register(&iscsi_connection_class);
2080 if (err)
2081 goto unregister_host_class;
2082
2083 err = transport_class_register(&iscsi_session_class);
2084 if (err)
2085 goto unregister_conn_class;
2086
2087 nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, 1, iscsi_if_rx,
2088 NULL, THIS_MODULE);
2089 if (!nls) {
2090 err = -ENOBUFS;
2091 goto unregister_session_class;
2092 }
2093
2094 iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
2095 if (!iscsi_eh_timer_workq)
2096 goto release_nls;
2097
2098 return 0;
2099
2100 release_nls:
2101 netlink_kernel_release(nls);
2102 unregister_session_class:
2103 transport_class_unregister(&iscsi_session_class);
2104 unregister_conn_class:
2105 transport_class_unregister(&iscsi_connection_class);
2106 unregister_host_class:
2107 transport_class_unregister(&iscsi_host_class);
2108 unregister_endpoint_class:
2109 class_unregister(&iscsi_endpoint_class);
2110 unregister_transport_class:
2111 class_unregister(&iscsi_transport_class);
2112 return err;
2113 }
2114
2115 static void __exit iscsi_transport_exit(void)
2116 {
2117 destroy_workqueue(iscsi_eh_timer_workq);
2118 netlink_kernel_release(nls);
2119 transport_class_unregister(&iscsi_connection_class);
2120 transport_class_unregister(&iscsi_session_class);
2121 transport_class_unregister(&iscsi_host_class);
2122 class_unregister(&iscsi_endpoint_class);
2123 class_unregister(&iscsi_transport_class);
2124 }
2125
2126 module_init(iscsi_transport_init);
2127 module_exit(iscsi_transport_exit);
2128
2129 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
2130 "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
2131 "Alex Aizman <itn780@yahoo.com>");
2132 MODULE_DESCRIPTION("iSCSI Transport Interface");
2133 MODULE_LICENSE("GPL");
2134 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
kernel-based virtual machine