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cyclades: fix read buffer overflow
[linux-2.6/kvm.git] / drivers / scsi / scsi_transport_iscsi.c
blobad897df36615ff4b06bf70da9db57dc0ca0a21c9
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 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 queue_delayed_work(iscsi_eh_timer_workq, &session->recovery_work,
631 session->recovery_tmo * HZ);
632 }
633
634 void iscsi_block_session(struct iscsi_cls_session *session)
635 {
636 queue_work(iscsi_eh_timer_workq, &session->block_work);
637 }
638 EXPORT_SYMBOL_GPL(iscsi_block_session);
639
640 static void __iscsi_unbind_session(struct work_struct *work)
641 {
642 struct iscsi_cls_session *session =
643 container_of(work, struct iscsi_cls_session,
644 unbind_work);
645 struct Scsi_Host *shost = iscsi_session_to_shost(session);
646 struct iscsi_cls_host *ihost = shost->shost_data;
647 unsigned long flags;
648
649 ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
650
651 /* Prevent new scans and make sure scanning is not in progress */
652 mutex_lock(&ihost->mutex);
653 spin_lock_irqsave(&session->lock, flags);
654 if (session->target_id == ISCSI_MAX_TARGET) {
655 spin_unlock_irqrestore(&session->lock, flags);
656 mutex_unlock(&ihost->mutex);
657 return;
658 }
659 session->target_id = ISCSI_MAX_TARGET;
660 spin_unlock_irqrestore(&session->lock, flags);
661 mutex_unlock(&ihost->mutex);
662
663 scsi_remove_target(&session->dev);
664 iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
665 ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
666 }
667
668 struct iscsi_cls_session *
669 iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
670 int dd_size)
671 {
672 struct iscsi_cls_session *session;
673
674 session = kzalloc(sizeof(*session) + dd_size,
675 GFP_KERNEL);
676 if (!session)
677 return NULL;
678
679 session->transport = transport;
680 session->recovery_tmo = 120;
681 session->state = ISCSI_SESSION_FREE;
682 INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
683 INIT_LIST_HEAD(&session->sess_list);
684 INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
685 INIT_WORK(&session->block_work, __iscsi_block_session);
686 INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
687 INIT_WORK(&session->scan_work, iscsi_scan_session);
688 spin_lock_init(&session->lock);
689
690 /* this is released in the dev's release function */
691 scsi_host_get(shost);
692 session->dev.parent = &shost->shost_gendev;
693 session->dev.release = iscsi_session_release;
694 device_initialize(&session->dev);
695 if (dd_size)
696 session->dd_data = &session[1];
697
698 ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
699 return session;
700 }
701 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
702
703 static int iscsi_get_next_target_id(struct device *dev, void *data)
704 {
705 struct iscsi_cls_session *session;
706 unsigned long flags;
707 int err = 0;
708
709 if (!iscsi_is_session_dev(dev))
710 return 0;
711
712 session = iscsi_dev_to_session(dev);
713 spin_lock_irqsave(&session->lock, flags);
714 if (*((unsigned int *) data) == session->target_id)
715 err = -EEXIST;
716 spin_unlock_irqrestore(&session->lock, flags);
717 return err;
718 }
719
720 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
721 {
722 struct Scsi_Host *shost = iscsi_session_to_shost(session);
723 struct iscsi_cls_host *ihost;
724 unsigned long flags;
725 unsigned int id = target_id;
726 int err;
727
728 ihost = shost->shost_data;
729 session->sid = atomic_add_return(1, &iscsi_session_nr);
730
731 if (id == ISCSI_MAX_TARGET) {
732 for (id = 0; id < ISCSI_MAX_TARGET; id++) {
733 err = device_for_each_child(&shost->shost_gendev, &id,
734 iscsi_get_next_target_id);
735 if (!err)
736 break;
737 }
738
739 if (id == ISCSI_MAX_TARGET) {
740 iscsi_cls_session_printk(KERN_ERR, session,
741 "Too many iscsi targets. Max "
742 "number of targets is %d.\n",
743 ISCSI_MAX_TARGET - 1);
744 err = -EOVERFLOW;
745 goto release_host;
746 }
747 }
748 session->target_id = id;
749
750 dev_set_name(&session->dev, "session%u", session->sid);
751 err = device_add(&session->dev);
752 if (err) {
753 iscsi_cls_session_printk(KERN_ERR, session,
754 "could not register session's dev\n");
755 goto release_host;
756 }
757 transport_register_device(&session->dev);
758
759 spin_lock_irqsave(&sesslock, flags);
760 list_add(&session->sess_list, &sesslist);
761 spin_unlock_irqrestore(&sesslock, flags);
762
763 iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
764 ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
765 return 0;
766
767 release_host:
768 scsi_host_put(shost);
769 return err;
770 }
771 EXPORT_SYMBOL_GPL(iscsi_add_session);
772
773 /**
774 * iscsi_create_session - create iscsi class session
775 * @shost: scsi host
776 * @transport: iscsi transport
777 * @dd_size: private driver data size
778 * @target_id: which target
779 *
780 * This can be called from a LLD or iscsi_transport.
781 */
782 struct iscsi_cls_session *
783 iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
784 int dd_size, unsigned int target_id)
785 {
786 struct iscsi_cls_session *session;
787
788 session = iscsi_alloc_session(shost, transport, dd_size);
789 if (!session)
790 return NULL;
791
792 if (iscsi_add_session(session, target_id)) {
793 iscsi_free_session(session);
794 return NULL;
795 }
796 return session;
797 }
798 EXPORT_SYMBOL_GPL(iscsi_create_session);
799
800 static void iscsi_conn_release(struct device *dev)
801 {
802 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
803 struct device *parent = conn->dev.parent;
804
805 ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
806 kfree(conn);
807 put_device(parent);
808 }
809
810 static int iscsi_is_conn_dev(const struct device *dev)
811 {
812 return dev->release == iscsi_conn_release;
813 }
814
815 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
816 {
817 if (!iscsi_is_conn_dev(dev))
818 return 0;
819 return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
820 }
821
822 void iscsi_remove_session(struct iscsi_cls_session *session)
823 {
824 struct Scsi_Host *shost = iscsi_session_to_shost(session);
825 unsigned long flags;
826 int err;
827
828 ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
829
830 spin_lock_irqsave(&sesslock, flags);
831 list_del(&session->sess_list);
832 spin_unlock_irqrestore(&sesslock, flags);
833
834 /* make sure there are no blocks/unblocks queued */
835 flush_workqueue(iscsi_eh_timer_workq);
836 /* make sure the timedout callout is not running */
837 if (!cancel_delayed_work(&session->recovery_work))
838 flush_workqueue(iscsi_eh_timer_workq);
839 /*
840 * If we are blocked let commands flow again. The lld or iscsi
841 * layer should set up the queuecommand to fail commands.
842 * We assume that LLD will not be calling block/unblock while
843 * removing the session.
844 */
845 spin_lock_irqsave(&session->lock, flags);
846 session->state = ISCSI_SESSION_FREE;
847 spin_unlock_irqrestore(&session->lock, flags);
848
849 scsi_target_unblock(&session->dev);
850 /* flush running scans then delete devices */
851 scsi_flush_work(shost);
852 __iscsi_unbind_session(&session->unbind_work);
853
854 /* hw iscsi may not have removed all connections from session */
855 err = device_for_each_child(&session->dev, NULL,
856 iscsi_iter_destroy_conn_fn);
857 if (err)
858 iscsi_cls_session_printk(KERN_ERR, session,
859 "Could not delete all connections "
860 "for session. Error %d.\n", err);
861
862 transport_unregister_device(&session->dev);
863
864 ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
865 device_del(&session->dev);
866 }
867 EXPORT_SYMBOL_GPL(iscsi_remove_session);
868
869 void iscsi_free_session(struct iscsi_cls_session *session)
870 {
871 ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
872 iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
873 put_device(&session->dev);
874 }
875 EXPORT_SYMBOL_GPL(iscsi_free_session);
876
877 /**
878 * iscsi_destroy_session - destroy iscsi session
879 * @session: iscsi_session
880 *
881 * Can be called by a LLD or iscsi_transport. There must not be
882 * any running connections.
883 */
884 int iscsi_destroy_session(struct iscsi_cls_session *session)
885 {
886 iscsi_remove_session(session);
887 ISCSI_DBG_TRANS_SESSION(session, "Completing session destruction\n");
888 iscsi_free_session(session);
889 return 0;
890 }
891 EXPORT_SYMBOL_GPL(iscsi_destroy_session);
892
893 /**
894 * iscsi_create_conn - create iscsi class connection
895 * @session: iscsi cls session
896 * @dd_size: private driver data size
897 * @cid: connection id
898 *
899 * This can be called from a LLD or iscsi_transport. The connection
900 * is child of the session so cid must be unique for all connections
901 * on the session.
902 *
903 * Since we do not support MCS, cid will normally be zero. In some cases
904 * for software iscsi we could be trying to preallocate a connection struct
905 * in which case there could be two connection structs and cid would be
906 * non-zero.
907 */
908 struct iscsi_cls_conn *
909 iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
910 {
911 struct iscsi_transport *transport = session->transport;
912 struct iscsi_cls_conn *conn;
913 unsigned long flags;
914 int err;
915
916 conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
917 if (!conn)
918 return NULL;
919 if (dd_size)
920 conn->dd_data = &conn[1];
921
922 INIT_LIST_HEAD(&conn->conn_list);
923 conn->transport = transport;
924 conn->cid = cid;
925
926 /* this is released in the dev's release function */
927 if (!get_device(&session->dev))
928 goto free_conn;
929
930 dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
931 conn->dev.parent = &session->dev;
932 conn->dev.release = iscsi_conn_release;
933 err = device_register(&conn->dev);
934 if (err) {
935 iscsi_cls_session_printk(KERN_ERR, session, "could not "
936 "register connection's dev\n");
937 goto release_parent_ref;
938 }
939 transport_register_device(&conn->dev);
940
941 spin_lock_irqsave(&connlock, flags);
942 list_add(&conn->conn_list, &connlist);
943 conn->active = 1;
944 spin_unlock_irqrestore(&connlock, flags);
945
946 ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
947 return conn;
948
949 release_parent_ref:
950 put_device(&session->dev);
951 free_conn:
952 kfree(conn);
953 return NULL;
954 }
955
956 EXPORT_SYMBOL_GPL(iscsi_create_conn);
957
958 /**
959 * iscsi_destroy_conn - destroy iscsi class connection
960 * @conn: iscsi cls session
961 *
962 * This can be called from a LLD or iscsi_transport.
963 */
964 int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
965 {
966 unsigned long flags;
967
968 spin_lock_irqsave(&connlock, flags);
969 conn->active = 0;
970 list_del(&conn->conn_list);
971 spin_unlock_irqrestore(&connlock, flags);
972
973 transport_unregister_device(&conn->dev);
974 ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n");
975 device_unregister(&conn->dev);
976 return 0;
977 }
978 EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
979
980 /*
981 * iscsi interface functions
982 */
983 static struct iscsi_internal *
984 iscsi_if_transport_lookup(struct iscsi_transport *tt)
985 {
986 struct iscsi_internal *priv;
987 unsigned long flags;
988
989 spin_lock_irqsave(&iscsi_transport_lock, flags);
990 list_for_each_entry(priv, &iscsi_transports, list) {
991 if (tt == priv->iscsi_transport) {
992 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
993 return priv;
994 }
995 }
996 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
997 return NULL;
998 }
999
1000 static int
1001 iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
1002 {
1003 return nlmsg_multicast(nls, skb, 0, group, gfp);
1004 }
1005
1006 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
1007 char *data, uint32_t data_size)
1008 {
1009 struct nlmsghdr *nlh;
1010 struct sk_buff *skb;
1011 struct iscsi_uevent *ev;
1012 char *pdu;
1013 struct iscsi_internal *priv;
1014 int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) +
1015 data_size);
1016
1017 priv = iscsi_if_transport_lookup(conn->transport);
1018 if (!priv)
1019 return -EINVAL;
1020
1021 skb = alloc_skb(len, GFP_ATOMIC);
1022 if (!skb) {
1023 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
1024 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
1025 "control PDU: OOM\n");
1026 return -ENOMEM;
1027 }
1028
1029 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1030 ev = NLMSG_DATA(nlh);
1031 memset(ev, 0, sizeof(*ev));
1032 ev->transport_handle = iscsi_handle(conn->transport);
1033 ev->type = ISCSI_KEVENT_RECV_PDU;
1034 ev->r.recv_req.cid = conn->cid;
1035 ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
1036 pdu = (char*)ev + sizeof(*ev);
1037 memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
1038 memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
1039
1040 return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1041 }
1042 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
1043
1044 int iscsi_offload_mesg(struct Scsi_Host *shost,
1045 struct iscsi_transport *transport, uint32_t type,
1046 char *data, uint16_t data_size)
1047 {
1048 struct nlmsghdr *nlh;
1049 struct sk_buff *skb;
1050 struct iscsi_uevent *ev;
1051 int len = NLMSG_SPACE(sizeof(*ev) + data_size);
1052
1053 skb = alloc_skb(len, GFP_ATOMIC);
1054 if (!skb) {
1055 printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
1056 return -ENOMEM;
1057 }
1058
1059 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1060 ev = NLMSG_DATA(nlh);
1061 memset(ev, 0, sizeof(*ev));
1062 ev->type = type;
1063 ev->transport_handle = iscsi_handle(transport);
1064 switch (type) {
1065 case ISCSI_KEVENT_PATH_REQ:
1066 ev->r.req_path.host_no = shost->host_no;
1067 break;
1068 case ISCSI_KEVENT_IF_DOWN:
1069 ev->r.notify_if_down.host_no = shost->host_no;
1070 break;
1071 }
1072
1073 memcpy((char *)ev + sizeof(*ev), data, data_size);
1074
1075 return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
1076 }
1077 EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
1078
1079 void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
1080 {
1081 struct nlmsghdr *nlh;
1082 struct sk_buff *skb;
1083 struct iscsi_uevent *ev;
1084 struct iscsi_internal *priv;
1085 int len = NLMSG_SPACE(sizeof(*ev));
1086
1087 priv = iscsi_if_transport_lookup(conn->transport);
1088 if (!priv)
1089 return;
1090
1091 skb = alloc_skb(len, GFP_ATOMIC);
1092 if (!skb) {
1093 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
1094 "conn error (%d)\n", error);
1095 return;
1096 }
1097
1098 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1099 ev = NLMSG_DATA(nlh);
1100 ev->transport_handle = iscsi_handle(conn->transport);
1101 ev->type = ISCSI_KEVENT_CONN_ERROR;
1102 ev->r.connerror.error = error;
1103 ev->r.connerror.cid = conn->cid;
1104 ev->r.connerror.sid = iscsi_conn_get_sid(conn);
1105
1106 iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1107
1108 iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
1109 error);
1110 }
1111 EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
1112
1113 static int
1114 iscsi_if_send_reply(uint32_t group, int seq, int type, int done, int multi,
1115 void *payload, int size)
1116 {
1117 struct sk_buff *skb;
1118 struct nlmsghdr *nlh;
1119 int len = NLMSG_SPACE(size);
1120 int flags = multi ? NLM_F_MULTI : 0;
1121 int t = done ? NLMSG_DONE : type;
1122
1123 skb = alloc_skb(len, GFP_ATOMIC);
1124 if (!skb) {
1125 printk(KERN_ERR "Could not allocate skb to send reply.\n");
1126 return -ENOMEM;
1127 }
1128
1129 nlh = __nlmsg_put(skb, 0, 0, t, (len - sizeof(*nlh)), 0);
1130 nlh->nlmsg_flags = flags;
1131 memcpy(NLMSG_DATA(nlh), payload, size);
1132 return iscsi_multicast_skb(skb, group, GFP_ATOMIC);
1133 }
1134
1135 static int
1136 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
1137 {
1138 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1139 struct iscsi_stats *stats;
1140 struct sk_buff *skbstat;
1141 struct iscsi_cls_conn *conn;
1142 struct nlmsghdr *nlhstat;
1143 struct iscsi_uevent *evstat;
1144 struct iscsi_internal *priv;
1145 int len = NLMSG_SPACE(sizeof(*ev) +
1146 sizeof(struct iscsi_stats) +
1147 sizeof(struct iscsi_stats_custom) *
1148 ISCSI_STATS_CUSTOM_MAX);
1149 int err = 0;
1150
1151 priv = iscsi_if_transport_lookup(transport);
1152 if (!priv)
1153 return -EINVAL;
1154
1155 conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
1156 if (!conn)
1157 return -EEXIST;
1158
1159 do {
1160 int actual_size;
1161
1162 skbstat = alloc_skb(len, GFP_ATOMIC);
1163 if (!skbstat) {
1164 iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
1165 "deliver stats: OOM\n");
1166 return -ENOMEM;
1167 }
1168
1169 nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
1170 (len - sizeof(*nlhstat)), 0);
1171 evstat = NLMSG_DATA(nlhstat);
1172 memset(evstat, 0, sizeof(*evstat));
1173 evstat->transport_handle = iscsi_handle(conn->transport);
1174 evstat->type = nlh->nlmsg_type;
1175 evstat->u.get_stats.cid =
1176 ev->u.get_stats.cid;
1177 evstat->u.get_stats.sid =
1178 ev->u.get_stats.sid;
1179 stats = (struct iscsi_stats *)
1180 ((char*)evstat + sizeof(*evstat));
1181 memset(stats, 0, sizeof(*stats));
1182
1183 transport->get_stats(conn, stats);
1184 actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) +
1185 sizeof(struct iscsi_stats) +
1186 sizeof(struct iscsi_stats_custom) *
1187 stats->custom_length);
1188 actual_size -= sizeof(*nlhstat);
1189 actual_size = NLMSG_LENGTH(actual_size);
1190 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
1191 nlhstat->nlmsg_len = actual_size;
1192
1193 err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
1194 GFP_ATOMIC);
1195 } while (err < 0 && err != -ECONNREFUSED);
1196
1197 return err;
1198 }
1199
1200 /**
1201 * iscsi_session_event - send session destr. completion event
1202 * @session: iscsi class session
1203 * @event: type of event
1204 */
1205 int iscsi_session_event(struct iscsi_cls_session *session,
1206 enum iscsi_uevent_e event)
1207 {
1208 struct iscsi_internal *priv;
1209 struct Scsi_Host *shost;
1210 struct iscsi_uevent *ev;
1211 struct sk_buff *skb;
1212 struct nlmsghdr *nlh;
1213 int rc, len = NLMSG_SPACE(sizeof(*ev));
1214
1215 priv = iscsi_if_transport_lookup(session->transport);
1216 if (!priv)
1217 return -EINVAL;
1218 shost = iscsi_session_to_shost(session);
1219
1220 skb = alloc_skb(len, GFP_KERNEL);
1221 if (!skb) {
1222 iscsi_cls_session_printk(KERN_ERR, session,
1223 "Cannot notify userspace of session "
1224 "event %u\n", event);
1225 return -ENOMEM;
1226 }
1227
1228 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1229 ev = NLMSG_DATA(nlh);
1230 ev->transport_handle = iscsi_handle(session->transport);
1231
1232 ev->type = event;
1233 switch (event) {
1234 case ISCSI_KEVENT_DESTROY_SESSION:
1235 ev->r.d_session.host_no = shost->host_no;
1236 ev->r.d_session.sid = session->sid;
1237 break;
1238 case ISCSI_KEVENT_CREATE_SESSION:
1239 ev->r.c_session_ret.host_no = shost->host_no;
1240 ev->r.c_session_ret.sid = session->sid;
1241 break;
1242 case ISCSI_KEVENT_UNBIND_SESSION:
1243 ev->r.unbind_session.host_no = shost->host_no;
1244 ev->r.unbind_session.sid = session->sid;
1245 break;
1246 default:
1247 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
1248 "%u.\n", event);
1249 kfree_skb(skb);
1250 return -EINVAL;
1251 }
1252
1253 /*
1254 * this will occur if the daemon is not up, so we just warn
1255 * the user and when the daemon is restarted it will handle it
1256 */
1257 rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
1258 if (rc == -ESRCH)
1259 iscsi_cls_session_printk(KERN_ERR, session,
1260 "Cannot notify userspace of session "
1261 "event %u. Check iscsi daemon\n",
1262 event);
1263
1264 ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
1265 event, rc);
1266 return rc;
1267 }
1268 EXPORT_SYMBOL_GPL(iscsi_session_event);
1269
1270 static int
1271 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
1272 struct iscsi_uevent *ev, uint32_t initial_cmdsn,
1273 uint16_t cmds_max, uint16_t queue_depth)
1274 {
1275 struct iscsi_transport *transport = priv->iscsi_transport;
1276 struct iscsi_cls_session *session;
1277 struct Scsi_Host *shost;
1278
1279 session = transport->create_session(ep, cmds_max, queue_depth,
1280 initial_cmdsn);
1281 if (!session)
1282 return -ENOMEM;
1283
1284 shost = iscsi_session_to_shost(session);
1285 ev->r.c_session_ret.host_no = shost->host_no;
1286 ev->r.c_session_ret.sid = session->sid;
1287 ISCSI_DBG_TRANS_SESSION(session,
1288 "Completed creating transport session\n");
1289 return 0;
1290 }
1291
1292 static int
1293 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1294 {
1295 struct iscsi_cls_conn *conn;
1296 struct iscsi_cls_session *session;
1297
1298 session = iscsi_session_lookup(ev->u.c_conn.sid);
1299 if (!session) {
1300 printk(KERN_ERR "iscsi: invalid session %d.\n",
1301 ev->u.c_conn.sid);
1302 return -EINVAL;
1303 }
1304
1305 conn = transport->create_conn(session, ev->u.c_conn.cid);
1306 if (!conn) {
1307 iscsi_cls_session_printk(KERN_ERR, session,
1308 "couldn't create a new connection.");
1309 return -ENOMEM;
1310 }
1311
1312 ev->r.c_conn_ret.sid = session->sid;
1313 ev->r.c_conn_ret.cid = conn->cid;
1314
1315 ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
1316 return 0;
1317 }
1318
1319 static int
1320 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1321 {
1322 struct iscsi_cls_conn *conn;
1323
1324 conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
1325 if (!conn)
1326 return -EINVAL;
1327
1328 ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
1329 if (transport->destroy_conn)
1330 transport->destroy_conn(conn);
1331
1332 return 0;
1333 }
1334
1335 static int
1336 iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1337 {
1338 char *data = (char*)ev + sizeof(*ev);
1339 struct iscsi_cls_conn *conn;
1340 struct iscsi_cls_session *session;
1341 int err = 0, value = 0;
1342
1343 session = iscsi_session_lookup(ev->u.set_param.sid);
1344 conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
1345 if (!conn || !session)
1346 return -EINVAL;
1347
1348 switch (ev->u.set_param.param) {
1349 case ISCSI_PARAM_SESS_RECOVERY_TMO:
1350 sscanf(data, "%d", &value);
1351 if (value != 0)
1352 session->recovery_tmo = value;
1353 break;
1354 default:
1355 err = transport->set_param(conn, ev->u.set_param.param,
1356 data, ev->u.set_param.len);
1357 }
1358
1359 return err;
1360 }
1361
1362 static int iscsi_if_ep_connect(struct iscsi_transport *transport,
1363 struct iscsi_uevent *ev, int msg_type)
1364 {
1365 struct iscsi_endpoint *ep;
1366 struct sockaddr *dst_addr;
1367 struct Scsi_Host *shost = NULL;
1368 int non_blocking, err = 0;
1369
1370 if (!transport->ep_connect)
1371 return -EINVAL;
1372
1373 if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
1374 shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
1375 if (!shost) {
1376 printk(KERN_ERR "ep connect failed. Could not find "
1377 "host no %u\n",
1378 ev->u.ep_connect_through_host.host_no);
1379 return -ENODEV;
1380 }
1381 non_blocking = ev->u.ep_connect_through_host.non_blocking;
1382 } else
1383 non_blocking = ev->u.ep_connect.non_blocking;
1384
1385 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1386 ep = transport->ep_connect(shost, dst_addr, non_blocking);
1387 if (IS_ERR(ep)) {
1388 err = PTR_ERR(ep);
1389 goto release_host;
1390 }
1391
1392 ev->r.ep_connect_ret.handle = ep->id;
1393 release_host:
1394 if (shost)
1395 scsi_host_put(shost);
1396 return err;
1397 }
1398
1399 static int
1400 iscsi_if_transport_ep(struct iscsi_transport *transport,
1401 struct iscsi_uevent *ev, int msg_type)
1402 {
1403 struct iscsi_endpoint *ep;
1404 int rc = 0;
1405
1406 switch (msg_type) {
1407 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
1408 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1409 rc = iscsi_if_ep_connect(transport, ev, msg_type);
1410 break;
1411 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1412 if (!transport->ep_poll)
1413 return -EINVAL;
1414
1415 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
1416 if (!ep)
1417 return -EINVAL;
1418
1419 ev->r.retcode = transport->ep_poll(ep,
1420 ev->u.ep_poll.timeout_ms);
1421 break;
1422 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1423 if (!transport->ep_disconnect)
1424 return -EINVAL;
1425
1426 ep = iscsi_lookup_endpoint(ev->u.ep_disconnect.ep_handle);
1427 if (!ep)
1428 return -EINVAL;
1429
1430 transport->ep_disconnect(ep);
1431 break;
1432 }
1433 return rc;
1434 }
1435
1436 static int
1437 iscsi_tgt_dscvr(struct iscsi_transport *transport,
1438 struct iscsi_uevent *ev)
1439 {
1440 struct Scsi_Host *shost;
1441 struct sockaddr *dst_addr;
1442 int err;
1443
1444 if (!transport->tgt_dscvr)
1445 return -EINVAL;
1446
1447 shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
1448 if (!shost) {
1449 printk(KERN_ERR "target discovery could not find host no %u\n",
1450 ev->u.tgt_dscvr.host_no);
1451 return -ENODEV;
1452 }
1453
1454
1455 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1456 err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
1457 ev->u.tgt_dscvr.enable, dst_addr);
1458 scsi_host_put(shost);
1459 return err;
1460 }
1461
1462 static int
1463 iscsi_set_host_param(struct iscsi_transport *transport,
1464 struct iscsi_uevent *ev)
1465 {
1466 char *data = (char*)ev + sizeof(*ev);
1467 struct Scsi_Host *shost;
1468 int err;
1469
1470 if (!transport->set_host_param)
1471 return -ENOSYS;
1472
1473 shost = scsi_host_lookup(ev->u.set_host_param.host_no);
1474 if (!shost) {
1475 printk(KERN_ERR "set_host_param could not find host no %u\n",
1476 ev->u.set_host_param.host_no);
1477 return -ENODEV;
1478 }
1479
1480 err = transport->set_host_param(shost, ev->u.set_host_param.param,
1481 data, ev->u.set_host_param.len);
1482 scsi_host_put(shost);
1483 return err;
1484 }
1485
1486 static int
1487 iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1488 {
1489 struct Scsi_Host *shost;
1490 struct iscsi_path *params;
1491 int err;
1492
1493 if (!transport->set_path)
1494 return -ENOSYS;
1495
1496 shost = scsi_host_lookup(ev->u.set_path.host_no);
1497 if (!shost) {
1498 printk(KERN_ERR "set path could not find host no %u\n",
1499 ev->u.set_path.host_no);
1500 return -ENODEV;
1501 }
1502
1503 params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
1504 err = transport->set_path(shost, params);
1505
1506 scsi_host_put(shost);
1507 return err;
1508 }
1509
1510 static int
1511 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
1512 {
1513 int err = 0;
1514 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1515 struct iscsi_transport *transport = NULL;
1516 struct iscsi_internal *priv;
1517 struct iscsi_cls_session *session;
1518 struct iscsi_cls_conn *conn;
1519 struct iscsi_endpoint *ep = NULL;
1520
1521 if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
1522 *group = ISCSI_NL_GRP_UIP;
1523 else
1524 *group = ISCSI_NL_GRP_ISCSID;
1525
1526 priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
1527 if (!priv)
1528 return -EINVAL;
1529 transport = priv->iscsi_transport;
1530
1531 if (!try_module_get(transport->owner))
1532 return -EINVAL;
1533
1534 switch (nlh->nlmsg_type) {
1535 case ISCSI_UEVENT_CREATE_SESSION:
1536 err = iscsi_if_create_session(priv, ep, ev,
1537 ev->u.c_session.initial_cmdsn,
1538 ev->u.c_session.cmds_max,
1539 ev->u.c_session.queue_depth);
1540 break;
1541 case ISCSI_UEVENT_CREATE_BOUND_SESSION:
1542 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
1543 if (!ep) {
1544 err = -EINVAL;
1545 break;
1546 }
1547
1548 err = iscsi_if_create_session(priv, ep, ev,
1549 ev->u.c_bound_session.initial_cmdsn,
1550 ev->u.c_bound_session.cmds_max,
1551 ev->u.c_bound_session.queue_depth);
1552 break;
1553 case ISCSI_UEVENT_DESTROY_SESSION:
1554 session = iscsi_session_lookup(ev->u.d_session.sid);
1555 if (session)
1556 transport->destroy_session(session);
1557 else
1558 err = -EINVAL;
1559 break;
1560 case ISCSI_UEVENT_UNBIND_SESSION:
1561 session = iscsi_session_lookup(ev->u.d_session.sid);
1562 if (session)
1563 scsi_queue_work(iscsi_session_to_shost(session),
1564 &session->unbind_work);
1565 else
1566 err = -EINVAL;
1567 break;
1568 case ISCSI_UEVENT_CREATE_CONN:
1569 err = iscsi_if_create_conn(transport, ev);
1570 break;
1571 case ISCSI_UEVENT_DESTROY_CONN:
1572 err = iscsi_if_destroy_conn(transport, ev);
1573 break;
1574 case ISCSI_UEVENT_BIND_CONN:
1575 session = iscsi_session_lookup(ev->u.b_conn.sid);
1576 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
1577
1578 if (session && conn)
1579 ev->r.retcode = transport->bind_conn(session, conn,
1580 ev->u.b_conn.transport_eph,
1581 ev->u.b_conn.is_leading);
1582 else
1583 err = -EINVAL;
1584 break;
1585 case ISCSI_UEVENT_SET_PARAM:
1586 err = iscsi_set_param(transport, ev);
1587 break;
1588 case ISCSI_UEVENT_START_CONN:
1589 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
1590 if (conn)
1591 ev->r.retcode = transport->start_conn(conn);
1592 else
1593 err = -EINVAL;
1594 break;
1595 case ISCSI_UEVENT_STOP_CONN:
1596 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
1597 if (conn)
1598 transport->stop_conn(conn, ev->u.stop_conn.flag);
1599 else
1600 err = -EINVAL;
1601 break;
1602 case ISCSI_UEVENT_SEND_PDU:
1603 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
1604 if (conn)
1605 ev->r.retcode = transport->send_pdu(conn,
1606 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
1607 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
1608 ev->u.send_pdu.data_size);
1609 else
1610 err = -EINVAL;
1611 break;
1612 case ISCSI_UEVENT_GET_STATS:
1613 err = iscsi_if_get_stats(transport, nlh);
1614 break;
1615 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1616 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1617 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1618 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
1619 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
1620 break;
1621 case ISCSI_UEVENT_TGT_DSCVR:
1622 err = iscsi_tgt_dscvr(transport, ev);
1623 break;
1624 case ISCSI_UEVENT_SET_HOST_PARAM:
1625 err = iscsi_set_host_param(transport, ev);
1626 break;
1627 case ISCSI_UEVENT_PATH_UPDATE:
1628 err = iscsi_set_path(transport, ev);
1629 break;
1630 default:
1631 err = -ENOSYS;
1632 break;
1633 }
1634
1635 module_put(transport->owner);
1636 return err;
1637 }
1638
1639 /*
1640 * Get message from skb. Each message is processed by iscsi_if_recv_msg.
1641 * Malformed skbs with wrong lengths or invalid creds are not processed.
1642 */
1643 static void
1644 iscsi_if_rx(struct sk_buff *skb)
1645 {
1646 mutex_lock(&rx_queue_mutex);
1647 while (skb->len >= NLMSG_SPACE(0)) {
1648 int err;
1649 uint32_t rlen;
1650 struct nlmsghdr *nlh;
1651 struct iscsi_uevent *ev;
1652 uint32_t group;
1653
1654 nlh = nlmsg_hdr(skb);
1655 if (nlh->nlmsg_len < sizeof(*nlh) ||
1656 skb->len < nlh->nlmsg_len) {
1657 break;
1658 }
1659
1660 ev = NLMSG_DATA(nlh);
1661 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
1662 if (rlen > skb->len)
1663 rlen = skb->len;
1664
1665 err = iscsi_if_recv_msg(skb, nlh, &group);
1666 if (err) {
1667 ev->type = ISCSI_KEVENT_IF_ERROR;
1668 ev->iferror = err;
1669 }
1670 do {
1671 /*
1672 * special case for GET_STATS:
1673 * on success - sending reply and stats from
1674 * inside of if_recv_msg(),
1675 * on error - fall through.
1676 */
1677 if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
1678 break;
1679 err = iscsi_if_send_reply(group, nlh->nlmsg_seq,
1680 nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
1681 } while (err < 0 && err != -ECONNREFUSED);
1682 skb_pull(skb, rlen);
1683 }
1684 mutex_unlock(&rx_queue_mutex);
1685 }
1686
1687 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \
1688 struct device_attribute dev_attr_##_prefix##_##_name = \
1689 __ATTR(_name,_mode,_show,_store)
1690
1691 /*
1692 * iSCSI connection attrs
1693 */
1694 #define iscsi_conn_attr_show(param) \
1695 static ssize_t \
1696 show_conn_param_##param(struct device *dev, \
1697 struct device_attribute *attr, char *buf) \
1698 { \
1699 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \
1700 struct iscsi_transport *t = conn->transport; \
1701 return t->get_conn_param(conn, param, buf); \
1702 }
1703
1704 #define iscsi_conn_attr(field, param) \
1705 iscsi_conn_attr_show(param) \
1706 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param, \
1707 NULL);
1708
1709 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
1710 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
1711 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
1712 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
1713 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
1714 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
1715 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
1716 iscsi_conn_attr(port, ISCSI_PARAM_CONN_PORT);
1717 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
1718 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
1719 iscsi_conn_attr(address, ISCSI_PARAM_CONN_ADDRESS);
1720 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
1721 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
1722
1723 /*
1724 * iSCSI session attrs
1725 */
1726 #define iscsi_session_attr_show(param, perm) \
1727 static ssize_t \
1728 show_session_param_##param(struct device *dev, \
1729 struct device_attribute *attr, char *buf) \
1730 { \
1731 struct iscsi_cls_session *session = \
1732 iscsi_dev_to_session(dev->parent); \
1733 struct iscsi_transport *t = session->transport; \
1734 \
1735 if (perm && !capable(CAP_SYS_ADMIN)) \
1736 return -EACCES; \
1737 return t->get_session_param(session, param, buf); \
1738 }
1739
1740 #define iscsi_session_attr(field, param, perm) \
1741 iscsi_session_attr_show(param, perm) \
1742 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
1743 NULL);
1744
1745 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
1746 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
1747 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
1748 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
1749 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
1750 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
1751 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
1752 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
1753 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
1754 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
1755 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
1756 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
1757 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
1758 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
1759 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
1760 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
1761 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
1762 iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
1763 iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0)
1764
1765 static ssize_t
1766 show_priv_session_state(struct device *dev, struct device_attribute *attr,
1767 char *buf)
1768 {
1769 struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
1770 return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
1771 }
1772 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
1773 NULL);
1774
1775 #define iscsi_priv_session_attr_show(field, format) \
1776 static ssize_t \
1777 show_priv_session_##field(struct device *dev, \
1778 struct device_attribute *attr, char *buf) \
1779 { \
1780 struct iscsi_cls_session *session = \
1781 iscsi_dev_to_session(dev->parent); \
1782 return sprintf(buf, format"\n", session->field); \
1783 }
1784
1785 #define iscsi_priv_session_attr(field, format) \
1786 iscsi_priv_session_attr_show(field, format) \
1787 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO, show_priv_session_##field, \
1788 NULL)
1789 iscsi_priv_session_attr(recovery_tmo, "%d");
1790
1791 /*
1792 * iSCSI host attrs
1793 */
1794 #define iscsi_host_attr_show(param) \
1795 static ssize_t \
1796 show_host_param_##param(struct device *dev, \
1797 struct device_attribute *attr, char *buf) \
1798 { \
1799 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1800 struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
1801 return priv->iscsi_transport->get_host_param(shost, param, buf); \
1802 }
1803
1804 #define iscsi_host_attr(field, param) \
1805 iscsi_host_attr_show(param) \
1806 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param, \
1807 NULL);
1808
1809 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
1810 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
1811 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
1812 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
1813
1814 #define SETUP_PRIV_SESSION_RD_ATTR(field) \
1815 do { \
1816 priv->session_attrs[count] = &dev_attr_priv_sess_##field; \
1817 count++; \
1818 } while (0)
1819
1820
1821 #define SETUP_SESSION_RD_ATTR(field, param_flag) \
1822 do { \
1823 if (tt->param_mask & param_flag) { \
1824 priv->session_attrs[count] = &dev_attr_sess_##field; \
1825 count++; \
1826 } \
1827 } while (0)
1828
1829 #define SETUP_CONN_RD_ATTR(field, param_flag) \
1830 do { \
1831 if (tt->param_mask & param_flag) { \
1832 priv->conn_attrs[count] = &dev_attr_conn_##field; \
1833 count++; \
1834 } \
1835 } while (0)
1836
1837 #define SETUP_HOST_RD_ATTR(field, param_flag) \
1838 do { \
1839 if (tt->host_param_mask & param_flag) { \
1840 priv->host_attrs[count] = &dev_attr_host_##field; \
1841 count++; \
1842 } \
1843 } while (0)
1844
1845 static int iscsi_session_match(struct attribute_container *cont,
1846 struct device *dev)
1847 {
1848 struct iscsi_cls_session *session;
1849 struct Scsi_Host *shost;
1850 struct iscsi_internal *priv;
1851
1852 if (!iscsi_is_session_dev(dev))
1853 return 0;
1854
1855 session = iscsi_dev_to_session(dev);
1856 shost = iscsi_session_to_shost(session);
1857 if (!shost->transportt)
1858 return 0;
1859
1860 priv = to_iscsi_internal(shost->transportt);
1861 if (priv->session_cont.ac.class != &iscsi_session_class.class)
1862 return 0;
1863
1864 return &priv->session_cont.ac == cont;
1865 }
1866
1867 static int iscsi_conn_match(struct attribute_container *cont,
1868 struct device *dev)
1869 {
1870 struct iscsi_cls_session *session;
1871 struct iscsi_cls_conn *conn;
1872 struct Scsi_Host *shost;
1873 struct iscsi_internal *priv;
1874
1875 if (!iscsi_is_conn_dev(dev))
1876 return 0;
1877
1878 conn = iscsi_dev_to_conn(dev);
1879 session = iscsi_dev_to_session(conn->dev.parent);
1880 shost = iscsi_session_to_shost(session);
1881
1882 if (!shost->transportt)
1883 return 0;
1884
1885 priv = to_iscsi_internal(shost->transportt);
1886 if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
1887 return 0;
1888
1889 return &priv->conn_cont.ac == cont;
1890 }
1891
1892 static int iscsi_host_match(struct attribute_container *cont,
1893 struct device *dev)
1894 {
1895 struct Scsi_Host *shost;
1896 struct iscsi_internal *priv;
1897
1898 if (!scsi_is_host_device(dev))
1899 return 0;
1900
1901 shost = dev_to_shost(dev);
1902 if (!shost->transportt ||
1903 shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
1904 return 0;
1905
1906 priv = to_iscsi_internal(shost->transportt);
1907 return &priv->t.host_attrs.ac == cont;
1908 }
1909
1910 struct scsi_transport_template *
1911 iscsi_register_transport(struct iscsi_transport *tt)
1912 {
1913 struct iscsi_internal *priv;
1914 unsigned long flags;
1915 int count = 0, err;
1916
1917 BUG_ON(!tt);
1918
1919 priv = iscsi_if_transport_lookup(tt);
1920 if (priv)
1921 return NULL;
1922
1923 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1924 if (!priv)
1925 return NULL;
1926 INIT_LIST_HEAD(&priv->list);
1927 priv->iscsi_transport = tt;
1928 priv->t.user_scan = iscsi_user_scan;
1929 priv->t.create_work_queue = 1;
1930
1931 priv->dev.class = &iscsi_transport_class;
1932 dev_set_name(&priv->dev, "%s", tt->name);
1933 err = device_register(&priv->dev);
1934 if (err)
1935 goto free_priv;
1936
1937 err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
1938 if (err)
1939 goto unregister_dev;
1940
1941 /* host parameters */
1942 priv->t.host_attrs.ac.attrs = &priv->host_attrs[0];
1943 priv->t.host_attrs.ac.class = &iscsi_host_class.class;
1944 priv->t.host_attrs.ac.match = iscsi_host_match;
1945 priv->t.host_size = sizeof(struct iscsi_cls_host);
1946 transport_container_register(&priv->t.host_attrs);
1947
1948 SETUP_HOST_RD_ATTR(netdev, ISCSI_HOST_NETDEV_NAME);
1949 SETUP_HOST_RD_ATTR(ipaddress, ISCSI_HOST_IPADDRESS);
1950 SETUP_HOST_RD_ATTR(hwaddress, ISCSI_HOST_HWADDRESS);
1951 SETUP_HOST_RD_ATTR(initiatorname, ISCSI_HOST_INITIATOR_NAME);
1952 BUG_ON(count > ISCSI_HOST_ATTRS);
1953 priv->host_attrs[count] = NULL;
1954 count = 0;
1955
1956 /* connection parameters */
1957 priv->conn_cont.ac.attrs = &priv->conn_attrs[0];
1958 priv->conn_cont.ac.class = &iscsi_connection_class.class;
1959 priv->conn_cont.ac.match = iscsi_conn_match;
1960 transport_container_register(&priv->conn_cont);
1961
1962 SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_MAX_RECV_DLENGTH);
1963 SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_MAX_XMIT_DLENGTH);
1964 SETUP_CONN_RD_ATTR(header_digest, ISCSI_HDRDGST_EN);
1965 SETUP_CONN_RD_ATTR(data_digest, ISCSI_DATADGST_EN);
1966 SETUP_CONN_RD_ATTR(ifmarker, ISCSI_IFMARKER_EN);
1967 SETUP_CONN_RD_ATTR(ofmarker, ISCSI_OFMARKER_EN);
1968 SETUP_CONN_RD_ATTR(address, ISCSI_CONN_ADDRESS);
1969 SETUP_CONN_RD_ATTR(port, ISCSI_CONN_PORT);
1970 SETUP_CONN_RD_ATTR(exp_statsn, ISCSI_EXP_STATSN);
1971 SETUP_CONN_RD_ATTR(persistent_address, ISCSI_PERSISTENT_ADDRESS);
1972 SETUP_CONN_RD_ATTR(persistent_port, ISCSI_PERSISTENT_PORT);
1973 SETUP_CONN_RD_ATTR(ping_tmo, ISCSI_PING_TMO);
1974 SETUP_CONN_RD_ATTR(recv_tmo, ISCSI_RECV_TMO);
1975
1976 BUG_ON(count > ISCSI_CONN_ATTRS);
1977 priv->conn_attrs[count] = NULL;
1978 count = 0;
1979
1980 /* session parameters */
1981 priv->session_cont.ac.attrs = &priv->session_attrs[0];
1982 priv->session_cont.ac.class = &iscsi_session_class.class;
1983 priv->session_cont.ac.match = iscsi_session_match;
1984 transport_container_register(&priv->session_cont);
1985
1986 SETUP_SESSION_RD_ATTR(initial_r2t, ISCSI_INITIAL_R2T_EN);
1987 SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_MAX_R2T);
1988 SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_IMM_DATA_EN);
1989 SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_FIRST_BURST);
1990 SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_MAX_BURST);
1991 SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PDU_INORDER_EN);
1992 SETUP_SESSION_RD_ATTR(data_seq_in_order, ISCSI_DATASEQ_INORDER_EN);
1993 SETUP_SESSION_RD_ATTR(erl, ISCSI_ERL);
1994 SETUP_SESSION_RD_ATTR(targetname, ISCSI_TARGET_NAME);
1995 SETUP_SESSION_RD_ATTR(tpgt, ISCSI_TPGT);
1996 SETUP_SESSION_RD_ATTR(password, ISCSI_USERNAME);
1997 SETUP_SESSION_RD_ATTR(password_in, ISCSI_USERNAME_IN);
1998 SETUP_SESSION_RD_ATTR(username, ISCSI_PASSWORD);
1999 SETUP_SESSION_RD_ATTR(username_in, ISCSI_PASSWORD_IN);
2000 SETUP_SESSION_RD_ATTR(fast_abort, ISCSI_FAST_ABORT);
2001 SETUP_SESSION_RD_ATTR(abort_tmo, ISCSI_ABORT_TMO);
2002 SETUP_SESSION_RD_ATTR(lu_reset_tmo,ISCSI_LU_RESET_TMO);
2003 SETUP_SESSION_RD_ATTR(ifacename, ISCSI_IFACE_NAME);
2004 SETUP_SESSION_RD_ATTR(initiatorname, ISCSI_INITIATOR_NAME);
2005 SETUP_PRIV_SESSION_RD_ATTR(recovery_tmo);
2006 SETUP_PRIV_SESSION_RD_ATTR(state);
2007
2008 BUG_ON(count > ISCSI_SESSION_ATTRS);
2009 priv->session_attrs[count] = NULL;
2010
2011 spin_lock_irqsave(&iscsi_transport_lock, flags);
2012 list_add(&priv->list, &iscsi_transports);
2013 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2014
2015 printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
2016 return &priv->t;
2017
2018 unregister_dev:
2019 device_unregister(&priv->dev);
2020 return NULL;
2021 free_priv:
2022 kfree(priv);
2023 return NULL;
2024 }
2025 EXPORT_SYMBOL_GPL(iscsi_register_transport);
2026
2027 int iscsi_unregister_transport(struct iscsi_transport *tt)
2028 {
2029 struct iscsi_internal *priv;
2030 unsigned long flags;
2031
2032 BUG_ON(!tt);
2033
2034 mutex_lock(&rx_queue_mutex);
2035
2036 priv = iscsi_if_transport_lookup(tt);
2037 BUG_ON (!priv);
2038
2039 spin_lock_irqsave(&iscsi_transport_lock, flags);
2040 list_del(&priv->list);
2041 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2042
2043 transport_container_unregister(&priv->conn_cont);
2044 transport_container_unregister(&priv->session_cont);
2045 transport_container_unregister(&priv->t.host_attrs);
2046
2047 sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
2048 device_unregister(&priv->dev);
2049 mutex_unlock(&rx_queue_mutex);
2050
2051 return 0;
2052 }
2053 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
2054
2055 static __init int iscsi_transport_init(void)
2056 {
2057 int err;
2058
2059 printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
2060 ISCSI_TRANSPORT_VERSION);
2061
2062 atomic_set(&iscsi_session_nr, 0);
2063
2064 err = class_register(&iscsi_transport_class);
2065 if (err)
2066 return err;
2067
2068 err = class_register(&iscsi_endpoint_class);
2069 if (err)
2070 goto unregister_transport_class;
2071
2072 err = transport_class_register(&iscsi_host_class);
2073 if (err)
2074 goto unregister_endpoint_class;
2075
2076 err = transport_class_register(&iscsi_connection_class);
2077 if (err)
2078 goto unregister_host_class;
2079
2080 err = transport_class_register(&iscsi_session_class);
2081 if (err)
2082 goto unregister_conn_class;
2083
2084 nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, 1, iscsi_if_rx,
2085 NULL, THIS_MODULE);
2086 if (!nls) {
2087 err = -ENOBUFS;
2088 goto unregister_session_class;
2089 }
2090
2091 iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
2092 if (!iscsi_eh_timer_workq)
2093 goto release_nls;
2094
2095 return 0;
2096
2097 release_nls:
2098 netlink_kernel_release(nls);
2099 unregister_session_class:
2100 transport_class_unregister(&iscsi_session_class);
2101 unregister_conn_class:
2102 transport_class_unregister(&iscsi_connection_class);
2103 unregister_host_class:
2104 transport_class_unregister(&iscsi_host_class);
2105 unregister_endpoint_class:
2106 class_unregister(&iscsi_endpoint_class);
2107 unregister_transport_class:
2108 class_unregister(&iscsi_transport_class);
2109 return err;
2110 }
2111
2112 static void __exit iscsi_transport_exit(void)
2113 {
2114 destroy_workqueue(iscsi_eh_timer_workq);
2115 netlink_kernel_release(nls);
2116 transport_class_unregister(&iscsi_connection_class);
2117 transport_class_unregister(&iscsi_session_class);
2118 transport_class_unregister(&iscsi_host_class);
2119 class_unregister(&iscsi_endpoint_class);
2120 class_unregister(&iscsi_transport_class);
2121 }
2122
2123 module_init(iscsi_transport_init);
2124 module_exit(iscsi_transport_exit);
2125
2126 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
2127 "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
2128 "Alex Aizman <itn780@yahoo.com>");
2129 MODULE_DESCRIPTION("iSCSI Transport Interface");
2130 MODULE_LICENSE("GPL");
2131 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
kernel-based virtual machine