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Linux 2.6.26-rc5
[linux-2.6/openmoko-kernel/knife-kernel.git] / drivers / scsi / scsi_transport_iscsi.c
blob65d1737eb664663735e1090133fcfd41a76824ce
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 19
34 #define ISCSI_CONN_ATTRS 13
35 #define ISCSI_HOST_ATTRS 4
36 #define ISCSI_TRANSPORT_VERSION "2.0-869"
37
38 struct iscsi_internal {
39 int daemon_pid;
40 struct scsi_transport_template t;
41 struct iscsi_transport *iscsi_transport;
42 struct list_head list;
43 struct device dev;
44
45 struct device_attribute *host_attrs[ISCSI_HOST_ATTRS + 1];
46 struct transport_container conn_cont;
47 struct device_attribute *conn_attrs[ISCSI_CONN_ATTRS + 1];
48 struct transport_container session_cont;
49 struct device_attribute *session_attrs[ISCSI_SESSION_ATTRS + 1];
50 };
51
52 static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
53 static struct workqueue_struct *iscsi_eh_timer_workq;
54
55 /*
56 * list of registered transports and lock that must
57 * be held while accessing list. The iscsi_transport_lock must
58 * be acquired after the rx_queue_mutex.
59 */
60 static LIST_HEAD(iscsi_transports);
61 static DEFINE_SPINLOCK(iscsi_transport_lock);
62
63 #define to_iscsi_internal(tmpl) \
64 container_of(tmpl, struct iscsi_internal, t)
65
66 #define dev_to_iscsi_internal(_dev) \
67 container_of(_dev, struct iscsi_internal, dev)
68
69 static void iscsi_transport_release(struct device *dev)
70 {
71 struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
72 kfree(priv);
73 }
74
75 /*
76 * iscsi_transport_class represents the iscsi_transports that are
77 * registered.
78 */
79 static struct class iscsi_transport_class = {
80 .name = "iscsi_transport",
81 .dev_release = iscsi_transport_release,
82 };
83
84 static ssize_t
85 show_transport_handle(struct device *dev, struct device_attribute *attr,
86 char *buf)
87 {
88 struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
89 return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport));
90 }
91 static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
92
93 #define show_transport_attr(name, format) \
94 static ssize_t \
95 show_transport_##name(struct device *dev, \
96 struct device_attribute *attr,char *buf) \
97 { \
98 struct iscsi_internal *priv = dev_to_iscsi_internal(dev); \
99 return sprintf(buf, format"\n", priv->iscsi_transport->name); \
100 } \
101 static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
102
103 show_transport_attr(caps, "0x%x");
104 show_transport_attr(max_lun, "%d");
105 show_transport_attr(max_conn, "%d");
106 show_transport_attr(max_cmd_len, "%d");
107
108 static struct attribute *iscsi_transport_attrs[] = {
109 &dev_attr_handle.attr,
110 &dev_attr_caps.attr,
111 &dev_attr_max_lun.attr,
112 &dev_attr_max_conn.attr,
113 &dev_attr_max_cmd_len.attr,
114 NULL,
115 };
116
117 static struct attribute_group iscsi_transport_group = {
118 .attrs = iscsi_transport_attrs,
119 };
120
121
122
123 static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
124 struct device *cdev)
125 {
126 struct Scsi_Host *shost = dev_to_shost(dev);
127 struct iscsi_host *ihost = shost->shost_data;
128
129 memset(ihost, 0, sizeof(*ihost));
130 INIT_LIST_HEAD(&ihost->sessions);
131 mutex_init(&ihost->mutex);
132 atomic_set(&ihost->nr_scans, 0);
133
134 snprintf(ihost->scan_workq_name, KOBJ_NAME_LEN, "iscsi_scan_%d",
135 shost->host_no);
136 ihost->scan_workq = create_singlethread_workqueue(
137 ihost->scan_workq_name);
138 if (!ihost->scan_workq)
139 return -ENOMEM;
140 return 0;
141 }
142
143 static int iscsi_remove_host(struct transport_container *tc, struct device *dev,
144 struct device *cdev)
145 {
146 struct Scsi_Host *shost = dev_to_shost(dev);
147 struct iscsi_host *ihost = shost->shost_data;
148
149 destroy_workqueue(ihost->scan_workq);
150 return 0;
151 }
152
153 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
154 "iscsi_host",
155 iscsi_setup_host,
156 iscsi_remove_host,
157 NULL);
158
159 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
160 "iscsi_session",
161 NULL,
162 NULL,
163 NULL);
164
165 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
166 "iscsi_connection",
167 NULL,
168 NULL,
169 NULL);
170
171 static struct sock *nls;
172 static DEFINE_MUTEX(rx_queue_mutex);
173
174 static LIST_HEAD(sesslist);
175 static DEFINE_SPINLOCK(sesslock);
176 static LIST_HEAD(connlist);
177 static DEFINE_SPINLOCK(connlock);
178
179 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
180 {
181 struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
182 return sess->sid;
183 }
184
185 /*
186 * Returns the matching session to a given sid
187 */
188 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
189 {
190 unsigned long flags;
191 struct iscsi_cls_session *sess;
192
193 spin_lock_irqsave(&sesslock, flags);
194 list_for_each_entry(sess, &sesslist, sess_list) {
195 if (sess->sid == sid) {
196 spin_unlock_irqrestore(&sesslock, flags);
197 return sess;
198 }
199 }
200 spin_unlock_irqrestore(&sesslock, flags);
201 return NULL;
202 }
203
204 /*
205 * Returns the matching connection to a given sid / cid tuple
206 */
207 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
208 {
209 unsigned long flags;
210 struct iscsi_cls_conn *conn;
211
212 spin_lock_irqsave(&connlock, flags);
213 list_for_each_entry(conn, &connlist, conn_list) {
214 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
215 spin_unlock_irqrestore(&connlock, flags);
216 return conn;
217 }
218 }
219 spin_unlock_irqrestore(&connlock, flags);
220 return NULL;
221 }
222
223 /*
224 * The following functions can be used by LLDs that allocate
225 * their own scsi_hosts or by software iscsi LLDs
226 */
227 static struct {
228 int value;
229 char *name;
230 } iscsi_session_state_names[] = {
231 { ISCSI_SESSION_LOGGED_IN, "LOGGED_IN" },
232 { ISCSI_SESSION_FAILED, "FAILED" },
233 { ISCSI_SESSION_FREE, "FREE" },
234 };
235
236 static const char *iscsi_session_state_name(int state)
237 {
238 int i;
239 char *name = NULL;
240
241 for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
242 if (iscsi_session_state_names[i].value == state) {
243 name = iscsi_session_state_names[i].name;
244 break;
245 }
246 }
247 return name;
248 }
249
250 int iscsi_session_chkready(struct iscsi_cls_session *session)
251 {
252 unsigned long flags;
253 int err;
254
255 spin_lock_irqsave(&session->lock, flags);
256 switch (session->state) {
257 case ISCSI_SESSION_LOGGED_IN:
258 err = 0;
259 break;
260 case ISCSI_SESSION_FAILED:
261 err = DID_IMM_RETRY << 16;
262 break;
263 case ISCSI_SESSION_FREE:
264 err = DID_NO_CONNECT << 16;
265 break;
266 default:
267 err = DID_NO_CONNECT << 16;
268 break;
269 }
270 spin_unlock_irqrestore(&session->lock, flags);
271 return err;
272 }
273 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
274
275 static void iscsi_session_release(struct device *dev)
276 {
277 struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
278 struct Scsi_Host *shost;
279
280 shost = iscsi_session_to_shost(session);
281 scsi_host_put(shost);
282 kfree(session);
283 }
284
285 static int iscsi_is_session_dev(const struct device *dev)
286 {
287 return dev->release == iscsi_session_release;
288 }
289
290 /**
291 * iscsi_scan_finished - helper to report when running scans are done
292 * @shost: scsi host
293 * @time: scan run time
294 *
295 * This function can be used by drives like qla4xxx to report to the scsi
296 * layer when the scans it kicked off at module load time are done.
297 */
298 int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
299 {
300 struct iscsi_host *ihost = shost->shost_data;
301 /*
302 * qla4xxx will have kicked off some session unblocks before calling
303 * scsi_scan_host, so just wait for them to complete.
304 */
305 return !atomic_read(&ihost->nr_scans);
306 }
307 EXPORT_SYMBOL_GPL(iscsi_scan_finished);
308
309 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
310 uint id, uint lun)
311 {
312 struct iscsi_host *ihost = shost->shost_data;
313 struct iscsi_cls_session *session;
314
315 mutex_lock(&ihost->mutex);
316 list_for_each_entry(session, &ihost->sessions, host_list) {
317 if ((channel == SCAN_WILD_CARD || channel == 0) &&
318 (id == SCAN_WILD_CARD || id == session->target_id))
319 scsi_scan_target(&session->dev, 0,
320 session->target_id, lun, 1);
321 }
322 mutex_unlock(&ihost->mutex);
323
324 return 0;
325 }
326
327 static void iscsi_scan_session(struct work_struct *work)
328 {
329 struct iscsi_cls_session *session =
330 container_of(work, struct iscsi_cls_session, scan_work);
331 struct Scsi_Host *shost = iscsi_session_to_shost(session);
332 struct iscsi_host *ihost = shost->shost_data;
333 unsigned long flags;
334
335 spin_lock_irqsave(&session->lock, flags);
336 if (session->state != ISCSI_SESSION_LOGGED_IN) {
337 spin_unlock_irqrestore(&session->lock, flags);
338 goto done;
339 }
340 spin_unlock_irqrestore(&session->lock, flags);
341
342 scsi_scan_target(&session->dev, 0, session->target_id,
343 SCAN_WILD_CARD, 1);
344 done:
345 atomic_dec(&ihost->nr_scans);
346 }
347
348 static void session_recovery_timedout(struct work_struct *work)
349 {
350 struct iscsi_cls_session *session =
351 container_of(work, struct iscsi_cls_session,
352 recovery_work.work);
353 unsigned long flags;
354
355 iscsi_cls_session_printk(KERN_INFO, session,
356 "session recovery timed out after %d secs\n",
357 session->recovery_tmo);
358
359 spin_lock_irqsave(&session->lock, flags);
360 switch (session->state) {
361 case ISCSI_SESSION_FAILED:
362 session->state = ISCSI_SESSION_FREE;
363 break;
364 case ISCSI_SESSION_LOGGED_IN:
365 case ISCSI_SESSION_FREE:
366 /* we raced with the unblock's flush */
367 spin_unlock_irqrestore(&session->lock, flags);
368 return;
369 }
370 spin_unlock_irqrestore(&session->lock, flags);
371
372 if (session->transport->session_recovery_timedout)
373 session->transport->session_recovery_timedout(session);
374
375 scsi_target_unblock(&session->dev);
376 }
377
378 static void __iscsi_unblock_session(struct work_struct *work)
379 {
380 struct iscsi_cls_session *session =
381 container_of(work, struct iscsi_cls_session,
382 unblock_work);
383 struct Scsi_Host *shost = iscsi_session_to_shost(session);
384 struct iscsi_host *ihost = shost->shost_data;
385 unsigned long flags;
386
387 /*
388 * The recovery and unblock work get run from the same workqueue,
389 * so try to cancel it if it was going to run after this unblock.
390 */
391 cancel_delayed_work(&session->recovery_work);
392 spin_lock_irqsave(&session->lock, flags);
393 session->state = ISCSI_SESSION_LOGGED_IN;
394 spin_unlock_irqrestore(&session->lock, flags);
395 /* start IO */
396 scsi_target_unblock(&session->dev);
397 /*
398 * Only do kernel scanning if the driver is properly hooked into
399 * the async scanning code (drivers like iscsi_tcp do login and
400 * scanning from userspace).
401 */
402 if (shost->hostt->scan_finished) {
403 if (queue_work(ihost->scan_workq, &session->scan_work))
404 atomic_inc(&ihost->nr_scans);
405 }
406 }
407
408 /**
409 * iscsi_unblock_session - set a session as logged in and start IO.
410 * @session: iscsi session
411 *
412 * Mark a session as ready to accept IO.
413 */
414 void iscsi_unblock_session(struct iscsi_cls_session *session)
415 {
416 queue_work(iscsi_eh_timer_workq, &session->unblock_work);
417 /*
418 * make sure all the events have completed before tell the driver
419 * it is safe
420 */
421 flush_workqueue(iscsi_eh_timer_workq);
422 }
423 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
424
425 static void __iscsi_block_session(struct work_struct *work)
426 {
427 struct iscsi_cls_session *session =
428 container_of(work, struct iscsi_cls_session,
429 block_work);
430 unsigned long flags;
431
432 spin_lock_irqsave(&session->lock, flags);
433 session->state = ISCSI_SESSION_FAILED;
434 spin_unlock_irqrestore(&session->lock, flags);
435 scsi_target_block(&session->dev);
436 queue_delayed_work(iscsi_eh_timer_workq, &session->recovery_work,
437 session->recovery_tmo * HZ);
438 }
439
440 void iscsi_block_session(struct iscsi_cls_session *session)
441 {
442 queue_work(iscsi_eh_timer_workq, &session->block_work);
443 }
444 EXPORT_SYMBOL_GPL(iscsi_block_session);
445
446 static void __iscsi_unbind_session(struct work_struct *work)
447 {
448 struct iscsi_cls_session *session =
449 container_of(work, struct iscsi_cls_session,
450 unbind_work);
451 struct Scsi_Host *shost = iscsi_session_to_shost(session);
452 struct iscsi_host *ihost = shost->shost_data;
453
454 /* Prevent new scans and make sure scanning is not in progress */
455 mutex_lock(&ihost->mutex);
456 if (list_empty(&session->host_list)) {
457 mutex_unlock(&ihost->mutex);
458 return;
459 }
460 list_del_init(&session->host_list);
461 mutex_unlock(&ihost->mutex);
462
463 scsi_remove_target(&session->dev);
464 iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
465 }
466
467 static int iscsi_unbind_session(struct iscsi_cls_session *session)
468 {
469 struct Scsi_Host *shost = iscsi_session_to_shost(session);
470 struct iscsi_host *ihost = shost->shost_data;
471
472 return queue_work(ihost->scan_workq, &session->unbind_work);
473 }
474
475 struct iscsi_cls_session *
476 iscsi_alloc_session(struct Scsi_Host *shost,
477 struct iscsi_transport *transport)
478 {
479 struct iscsi_cls_session *session;
480
481 session = kzalloc(sizeof(*session) + transport->sessiondata_size,
482 GFP_KERNEL);
483 if (!session)
484 return NULL;
485
486 session->transport = transport;
487 session->recovery_tmo = 120;
488 session->state = ISCSI_SESSION_FREE;
489 INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
490 INIT_LIST_HEAD(&session->host_list);
491 INIT_LIST_HEAD(&session->sess_list);
492 INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
493 INIT_WORK(&session->block_work, __iscsi_block_session);
494 INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
495 INIT_WORK(&session->scan_work, iscsi_scan_session);
496 spin_lock_init(&session->lock);
497
498 /* this is released in the dev's release function */
499 scsi_host_get(shost);
500 session->dev.parent = &shost->shost_gendev;
501 session->dev.release = iscsi_session_release;
502 device_initialize(&session->dev);
503 if (transport->sessiondata_size)
504 session->dd_data = &session[1];
505 return session;
506 }
507 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
508
509 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
510 {
511 struct Scsi_Host *shost = iscsi_session_to_shost(session);
512 struct iscsi_host *ihost;
513 unsigned long flags;
514 int err;
515
516 ihost = shost->shost_data;
517 session->sid = atomic_add_return(1, &iscsi_session_nr);
518 session->target_id = target_id;
519
520 snprintf(session->dev.bus_id, BUS_ID_SIZE, "session%u",
521 session->sid);
522 err = device_add(&session->dev);
523 if (err) {
524 iscsi_cls_session_printk(KERN_ERR, session,
525 "could not register session's dev\n");
526 goto release_host;
527 }
528 transport_register_device(&session->dev);
529
530 spin_lock_irqsave(&sesslock, flags);
531 list_add(&session->sess_list, &sesslist);
532 spin_unlock_irqrestore(&sesslock, flags);
533
534 mutex_lock(&ihost->mutex);
535 list_add(&session->host_list, &ihost->sessions);
536 mutex_unlock(&ihost->mutex);
537
538 iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
539 return 0;
540
541 release_host:
542 scsi_host_put(shost);
543 return err;
544 }
545 EXPORT_SYMBOL_GPL(iscsi_add_session);
546
547 /**
548 * iscsi_create_session - create iscsi class session
549 * @shost: scsi host
550 * @transport: iscsi transport
551 * @target_id: which target
552 *
553 * This can be called from a LLD or iscsi_transport.
554 */
555 struct iscsi_cls_session *
556 iscsi_create_session(struct Scsi_Host *shost,
557 struct iscsi_transport *transport,
558 unsigned int target_id)
559 {
560 struct iscsi_cls_session *session;
561
562 session = iscsi_alloc_session(shost, transport);
563 if (!session)
564 return NULL;
565
566 if (iscsi_add_session(session, target_id)) {
567 iscsi_free_session(session);
568 return NULL;
569 }
570 return session;
571 }
572 EXPORT_SYMBOL_GPL(iscsi_create_session);
573
574 static void iscsi_conn_release(struct device *dev)
575 {
576 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
577 struct device *parent = conn->dev.parent;
578
579 kfree(conn);
580 put_device(parent);
581 }
582
583 static int iscsi_is_conn_dev(const struct device *dev)
584 {
585 return dev->release == iscsi_conn_release;
586 }
587
588 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
589 {
590 if (!iscsi_is_conn_dev(dev))
591 return 0;
592 return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
593 }
594
595 void iscsi_remove_session(struct iscsi_cls_session *session)
596 {
597 struct Scsi_Host *shost = iscsi_session_to_shost(session);
598 struct iscsi_host *ihost = shost->shost_data;
599 unsigned long flags;
600 int err;
601
602 spin_lock_irqsave(&sesslock, flags);
603 list_del(&session->sess_list);
604 spin_unlock_irqrestore(&sesslock, flags);
605
606 /* make sure there are no blocks/unblocks queued */
607 flush_workqueue(iscsi_eh_timer_workq);
608 /* make sure the timedout callout is not running */
609 if (!cancel_delayed_work(&session->recovery_work))
610 flush_workqueue(iscsi_eh_timer_workq);
611 /*
612 * If we are blocked let commands flow again. The lld or iscsi
613 * layer should set up the queuecommand to fail commands.
614 * We assume that LLD will not be calling block/unblock while
615 * removing the session.
616 */
617 spin_lock_irqsave(&session->lock, flags);
618 session->state = ISCSI_SESSION_FREE;
619 spin_unlock_irqrestore(&session->lock, flags);
620
621 scsi_target_unblock(&session->dev);
622 /* flush running scans then delete devices */
623 flush_workqueue(ihost->scan_workq);
624 __iscsi_unbind_session(&session->unbind_work);
625
626 /* hw iscsi may not have removed all connections from session */
627 err = device_for_each_child(&session->dev, NULL,
628 iscsi_iter_destroy_conn_fn);
629 if (err)
630 iscsi_cls_session_printk(KERN_ERR, session,
631 "Could not delete all connections "
632 "for session. Error %d.\n", err);
633
634 transport_unregister_device(&session->dev);
635 device_del(&session->dev);
636 }
637 EXPORT_SYMBOL_GPL(iscsi_remove_session);
638
639 void iscsi_free_session(struct iscsi_cls_session *session)
640 {
641 iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
642 put_device(&session->dev);
643 }
644 EXPORT_SYMBOL_GPL(iscsi_free_session);
645
646 /**
647 * iscsi_destroy_session - destroy iscsi session
648 * @session: iscsi_session
649 *
650 * Can be called by a LLD or iscsi_transport. There must not be
651 * any running connections.
652 */
653 int iscsi_destroy_session(struct iscsi_cls_session *session)
654 {
655 iscsi_remove_session(session);
656 iscsi_free_session(session);
657 return 0;
658 }
659 EXPORT_SYMBOL_GPL(iscsi_destroy_session);
660
661 /**
662 * iscsi_create_conn - create iscsi class connection
663 * @session: iscsi cls session
664 * @cid: connection id
665 *
666 * This can be called from a LLD or iscsi_transport. The connection
667 * is child of the session so cid must be unique for all connections
668 * on the session.
669 *
670 * Since we do not support MCS, cid will normally be zero. In some cases
671 * for software iscsi we could be trying to preallocate a connection struct
672 * in which case there could be two connection structs and cid would be
673 * non-zero.
674 */
675 struct iscsi_cls_conn *
676 iscsi_create_conn(struct iscsi_cls_session *session, uint32_t cid)
677 {
678 struct iscsi_transport *transport = session->transport;
679 struct iscsi_cls_conn *conn;
680 unsigned long flags;
681 int err;
682
683 conn = kzalloc(sizeof(*conn) + transport->conndata_size, GFP_KERNEL);
684 if (!conn)
685 return NULL;
686
687 if (transport->conndata_size)
688 conn->dd_data = &conn[1];
689
690 INIT_LIST_HEAD(&conn->conn_list);
691 conn->transport = transport;
692 conn->cid = cid;
693
694 /* this is released in the dev's release function */
695 if (!get_device(&session->dev))
696 goto free_conn;
697
698 snprintf(conn->dev.bus_id, BUS_ID_SIZE, "connection%d:%u",
699 session->sid, cid);
700 conn->dev.parent = &session->dev;
701 conn->dev.release = iscsi_conn_release;
702 err = device_register(&conn->dev);
703 if (err) {
704 iscsi_cls_session_printk(KERN_ERR, session, "could not "
705 "register connection's dev\n");
706 goto release_parent_ref;
707 }
708 transport_register_device(&conn->dev);
709
710 spin_lock_irqsave(&connlock, flags);
711 list_add(&conn->conn_list, &connlist);
712 conn->active = 1;
713 spin_unlock_irqrestore(&connlock, flags);
714 return conn;
715
716 release_parent_ref:
717 put_device(&session->dev);
718 free_conn:
719 kfree(conn);
720 return NULL;
721 }
722
723 EXPORT_SYMBOL_GPL(iscsi_create_conn);
724
725 /**
726 * iscsi_destroy_conn - destroy iscsi class connection
727 * @conn: iscsi cls session
728 *
729 * This can be called from a LLD or iscsi_transport.
730 */
731 int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
732 {
733 unsigned long flags;
734
735 spin_lock_irqsave(&connlock, flags);
736 conn->active = 0;
737 list_del(&conn->conn_list);
738 spin_unlock_irqrestore(&connlock, flags);
739
740 transport_unregister_device(&conn->dev);
741 device_unregister(&conn->dev);
742 return 0;
743 }
744 EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
745
746 /*
747 * iscsi interface functions
748 */
749 static struct iscsi_internal *
750 iscsi_if_transport_lookup(struct iscsi_transport *tt)
751 {
752 struct iscsi_internal *priv;
753 unsigned long flags;
754
755 spin_lock_irqsave(&iscsi_transport_lock, flags);
756 list_for_each_entry(priv, &iscsi_transports, list) {
757 if (tt == priv->iscsi_transport) {
758 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
759 return priv;
760 }
761 }
762 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
763 return NULL;
764 }
765
766 static int
767 iscsi_broadcast_skb(struct sk_buff *skb, gfp_t gfp)
768 {
769 int rc;
770
771 rc = netlink_broadcast(nls, skb, 0, 1, gfp);
772 if (rc < 0) {
773 printk(KERN_ERR "iscsi: can not broadcast skb (%d)\n", rc);
774 return rc;
775 }
776
777 return 0;
778 }
779
780 static int
781 iscsi_unicast_skb(struct sk_buff *skb, int pid)
782 {
783 int rc;
784
785 rc = netlink_unicast(nls, skb, pid, MSG_DONTWAIT);
786 if (rc < 0) {
787 printk(KERN_ERR "iscsi: can not unicast skb (%d)\n", rc);
788 return rc;
789 }
790
791 return 0;
792 }
793
794 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
795 char *data, uint32_t data_size)
796 {
797 struct nlmsghdr *nlh;
798 struct sk_buff *skb;
799 struct iscsi_uevent *ev;
800 char *pdu;
801 struct iscsi_internal *priv;
802 int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) +
803 data_size);
804
805 priv = iscsi_if_transport_lookup(conn->transport);
806 if (!priv)
807 return -EINVAL;
808
809 skb = alloc_skb(len, GFP_ATOMIC);
810 if (!skb) {
811 iscsi_conn_error(conn, ISCSI_ERR_CONN_FAILED);
812 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
813 "control PDU: OOM\n");
814 return -ENOMEM;
815 }
816
817 nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
818 ev = NLMSG_DATA(nlh);
819 memset(ev, 0, sizeof(*ev));
820 ev->transport_handle = iscsi_handle(conn->transport);
821 ev->type = ISCSI_KEVENT_RECV_PDU;
822 ev->r.recv_req.cid = conn->cid;
823 ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
824 pdu = (char*)ev + sizeof(*ev);
825 memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
826 memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
827
828 return iscsi_unicast_skb(skb, priv->daemon_pid);
829 }
830 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
831
832 void iscsi_conn_error(struct iscsi_cls_conn *conn, enum iscsi_err error)
833 {
834 struct nlmsghdr *nlh;
835 struct sk_buff *skb;
836 struct iscsi_uevent *ev;
837 struct iscsi_internal *priv;
838 int len = NLMSG_SPACE(sizeof(*ev));
839
840 priv = iscsi_if_transport_lookup(conn->transport);
841 if (!priv)
842 return;
843
844 skb = alloc_skb(len, GFP_ATOMIC);
845 if (!skb) {
846 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
847 "conn error (%d)\n", error);
848 return;
849 }
850
851 nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
852 ev = NLMSG_DATA(nlh);
853 ev->transport_handle = iscsi_handle(conn->transport);
854 ev->type = ISCSI_KEVENT_CONN_ERROR;
855 ev->r.connerror.error = error;
856 ev->r.connerror.cid = conn->cid;
857 ev->r.connerror.sid = iscsi_conn_get_sid(conn);
858
859 iscsi_broadcast_skb(skb, GFP_ATOMIC);
860
861 iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
862 error);
863 }
864 EXPORT_SYMBOL_GPL(iscsi_conn_error);
865
866 static int
867 iscsi_if_send_reply(int pid, int seq, int type, int done, int multi,
868 void *payload, int size)
869 {
870 struct sk_buff *skb;
871 struct nlmsghdr *nlh;
872 int len = NLMSG_SPACE(size);
873 int flags = multi ? NLM_F_MULTI : 0;
874 int t = done ? NLMSG_DONE : type;
875
876 skb = alloc_skb(len, GFP_ATOMIC);
877 if (!skb) {
878 printk(KERN_ERR "Could not allocate skb to send reply.\n");
879 return -ENOMEM;
880 }
881
882 nlh = __nlmsg_put(skb, pid, seq, t, (len - sizeof(*nlh)), 0);
883 nlh->nlmsg_flags = flags;
884 memcpy(NLMSG_DATA(nlh), payload, size);
885 return iscsi_unicast_skb(skb, pid);
886 }
887
888 static int
889 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
890 {
891 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
892 struct iscsi_stats *stats;
893 struct sk_buff *skbstat;
894 struct iscsi_cls_conn *conn;
895 struct nlmsghdr *nlhstat;
896 struct iscsi_uevent *evstat;
897 struct iscsi_internal *priv;
898 int len = NLMSG_SPACE(sizeof(*ev) +
899 sizeof(struct iscsi_stats) +
900 sizeof(struct iscsi_stats_custom) *
901 ISCSI_STATS_CUSTOM_MAX);
902 int err = 0;
903
904 priv = iscsi_if_transport_lookup(transport);
905 if (!priv)
906 return -EINVAL;
907
908 conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
909 if (!conn)
910 return -EEXIST;
911
912 do {
913 int actual_size;
914
915 skbstat = alloc_skb(len, GFP_ATOMIC);
916 if (!skbstat) {
917 iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
918 "deliver stats: OOM\n");
919 return -ENOMEM;
920 }
921
922 nlhstat = __nlmsg_put(skbstat, priv->daemon_pid, 0, 0,
923 (len - sizeof(*nlhstat)), 0);
924 evstat = NLMSG_DATA(nlhstat);
925 memset(evstat, 0, sizeof(*evstat));
926 evstat->transport_handle = iscsi_handle(conn->transport);
927 evstat->type = nlh->nlmsg_type;
928 evstat->u.get_stats.cid =
929 ev->u.get_stats.cid;
930 evstat->u.get_stats.sid =
931 ev->u.get_stats.sid;
932 stats = (struct iscsi_stats *)
933 ((char*)evstat + sizeof(*evstat));
934 memset(stats, 0, sizeof(*stats));
935
936 transport->get_stats(conn, stats);
937 actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) +
938 sizeof(struct iscsi_stats) +
939 sizeof(struct iscsi_stats_custom) *
940 stats->custom_length);
941 actual_size -= sizeof(*nlhstat);
942 actual_size = NLMSG_LENGTH(actual_size);
943 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
944 nlhstat->nlmsg_len = actual_size;
945
946 err = iscsi_unicast_skb(skbstat, priv->daemon_pid);
947 } while (err < 0 && err != -ECONNREFUSED);
948
949 return err;
950 }
951
952 /**
953 * iscsi_session_event - send session destr. completion event
954 * @session: iscsi class session
955 * @event: type of event
956 */
957 int iscsi_session_event(struct iscsi_cls_session *session,
958 enum iscsi_uevent_e event)
959 {
960 struct iscsi_internal *priv;
961 struct Scsi_Host *shost;
962 struct iscsi_uevent *ev;
963 struct sk_buff *skb;
964 struct nlmsghdr *nlh;
965 int rc, len = NLMSG_SPACE(sizeof(*ev));
966
967 priv = iscsi_if_transport_lookup(session->transport);
968 if (!priv)
969 return -EINVAL;
970 shost = iscsi_session_to_shost(session);
971
972 skb = alloc_skb(len, GFP_KERNEL);
973 if (!skb) {
974 iscsi_cls_session_printk(KERN_ERR, session,
975 "Cannot notify userspace of session "
976 "event %u\n", event);
977 return -ENOMEM;
978 }
979
980 nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
981 ev = NLMSG_DATA(nlh);
982 ev->transport_handle = iscsi_handle(session->transport);
983
984 ev->type = event;
985 switch (event) {
986 case ISCSI_KEVENT_DESTROY_SESSION:
987 ev->r.d_session.host_no = shost->host_no;
988 ev->r.d_session.sid = session->sid;
989 break;
990 case ISCSI_KEVENT_CREATE_SESSION:
991 ev->r.c_session_ret.host_no = shost->host_no;
992 ev->r.c_session_ret.sid = session->sid;
993 break;
994 case ISCSI_KEVENT_UNBIND_SESSION:
995 ev->r.unbind_session.host_no = shost->host_no;
996 ev->r.unbind_session.sid = session->sid;
997 break;
998 default:
999 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
1000 "%u.\n", event);
1001 kfree_skb(skb);
1002 return -EINVAL;
1003 }
1004
1005 /*
1006 * this will occur if the daemon is not up, so we just warn
1007 * the user and when the daemon is restarted it will handle it
1008 */
1009 rc = iscsi_broadcast_skb(skb, GFP_KERNEL);
1010 if (rc < 0)
1011 iscsi_cls_session_printk(KERN_ERR, session,
1012 "Cannot notify userspace of session "
1013 "event %u. Check iscsi daemon\n",
1014 event);
1015 return rc;
1016 }
1017 EXPORT_SYMBOL_GPL(iscsi_session_event);
1018
1019 static int
1020 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_uevent *ev)
1021 {
1022 struct iscsi_transport *transport = priv->iscsi_transport;
1023 struct iscsi_cls_session *session;
1024 uint32_t hostno;
1025
1026 session = transport->create_session(transport, &priv->t,
1027 ev->u.c_session.cmds_max,
1028 ev->u.c_session.queue_depth,
1029 ev->u.c_session.initial_cmdsn,
1030 &hostno);
1031 if (!session)
1032 return -ENOMEM;
1033
1034 ev->r.c_session_ret.host_no = hostno;
1035 ev->r.c_session_ret.sid = session->sid;
1036 return 0;
1037 }
1038
1039 static int
1040 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1041 {
1042 struct iscsi_cls_conn *conn;
1043 struct iscsi_cls_session *session;
1044
1045 session = iscsi_session_lookup(ev->u.c_conn.sid);
1046 if (!session) {
1047 printk(KERN_ERR "iscsi: invalid session %d.\n",
1048 ev->u.c_conn.sid);
1049 return -EINVAL;
1050 }
1051
1052 conn = transport->create_conn(session, ev->u.c_conn.cid);
1053 if (!conn) {
1054 iscsi_cls_session_printk(KERN_ERR, session,
1055 "couldn't create a new connection.");
1056 return -ENOMEM;
1057 }
1058
1059 ev->r.c_conn_ret.sid = session->sid;
1060 ev->r.c_conn_ret.cid = conn->cid;
1061 return 0;
1062 }
1063
1064 static int
1065 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1066 {
1067 struct iscsi_cls_conn *conn;
1068
1069 conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
1070 if (!conn)
1071 return -EINVAL;
1072
1073 if (transport->destroy_conn)
1074 transport->destroy_conn(conn);
1075 return 0;
1076 }
1077
1078 static int
1079 iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1080 {
1081 char *data = (char*)ev + sizeof(*ev);
1082 struct iscsi_cls_conn *conn;
1083 struct iscsi_cls_session *session;
1084 int err = 0, value = 0;
1085
1086 session = iscsi_session_lookup(ev->u.set_param.sid);
1087 conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
1088 if (!conn || !session)
1089 return -EINVAL;
1090
1091 switch (ev->u.set_param.param) {
1092 case ISCSI_PARAM_SESS_RECOVERY_TMO:
1093 sscanf(data, "%d", &value);
1094 if (value != 0)
1095 session->recovery_tmo = value;
1096 break;
1097 default:
1098 err = transport->set_param(conn, ev->u.set_param.param,
1099 data, ev->u.set_param.len);
1100 }
1101
1102 return err;
1103 }
1104
1105 static int
1106 iscsi_if_transport_ep(struct iscsi_transport *transport,
1107 struct iscsi_uevent *ev, int msg_type)
1108 {
1109 struct sockaddr *dst_addr;
1110 int rc = 0;
1111
1112 switch (msg_type) {
1113 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1114 if (!transport->ep_connect)
1115 return -EINVAL;
1116
1117 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1118 rc = transport->ep_connect(dst_addr,
1119 ev->u.ep_connect.non_blocking,
1120 &ev->r.ep_connect_ret.handle);
1121 break;
1122 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1123 if (!transport->ep_poll)
1124 return -EINVAL;
1125
1126 ev->r.retcode = transport->ep_poll(ev->u.ep_poll.ep_handle,
1127 ev->u.ep_poll.timeout_ms);
1128 break;
1129 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1130 if (!transport->ep_disconnect)
1131 return -EINVAL;
1132
1133 transport->ep_disconnect(ev->u.ep_disconnect.ep_handle);
1134 break;
1135 }
1136 return rc;
1137 }
1138
1139 static int
1140 iscsi_tgt_dscvr(struct iscsi_transport *transport,
1141 struct iscsi_uevent *ev)
1142 {
1143 struct Scsi_Host *shost;
1144 struct sockaddr *dst_addr;
1145 int err;
1146
1147 if (!transport->tgt_dscvr)
1148 return -EINVAL;
1149
1150 shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
1151 if (IS_ERR(shost)) {
1152 printk(KERN_ERR "target discovery could not find host no %u\n",
1153 ev->u.tgt_dscvr.host_no);
1154 return -ENODEV;
1155 }
1156
1157
1158 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1159 err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
1160 ev->u.tgt_dscvr.enable, dst_addr);
1161 scsi_host_put(shost);
1162 return err;
1163 }
1164
1165 static int
1166 iscsi_set_host_param(struct iscsi_transport *transport,
1167 struct iscsi_uevent *ev)
1168 {
1169 char *data = (char*)ev + sizeof(*ev);
1170 struct Scsi_Host *shost;
1171 int err;
1172
1173 if (!transport->set_host_param)
1174 return -ENOSYS;
1175
1176 shost = scsi_host_lookup(ev->u.set_host_param.host_no);
1177 if (IS_ERR(shost)) {
1178 printk(KERN_ERR "set_host_param could not find host no %u\n",
1179 ev->u.set_host_param.host_no);
1180 return -ENODEV;
1181 }
1182
1183 err = transport->set_host_param(shost, ev->u.set_host_param.param,
1184 data, ev->u.set_host_param.len);
1185 scsi_host_put(shost);
1186 return err;
1187 }
1188
1189 static int
1190 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1191 {
1192 int err = 0;
1193 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1194 struct iscsi_transport *transport = NULL;
1195 struct iscsi_internal *priv;
1196 struct iscsi_cls_session *session;
1197 struct iscsi_cls_conn *conn;
1198
1199 priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
1200 if (!priv)
1201 return -EINVAL;
1202 transport = priv->iscsi_transport;
1203
1204 if (!try_module_get(transport->owner))
1205 return -EINVAL;
1206
1207 priv->daemon_pid = NETLINK_CREDS(skb)->pid;
1208
1209 switch (nlh->nlmsg_type) {
1210 case ISCSI_UEVENT_CREATE_SESSION:
1211 err = iscsi_if_create_session(priv, ev);
1212 break;
1213 case ISCSI_UEVENT_DESTROY_SESSION:
1214 session = iscsi_session_lookup(ev->u.d_session.sid);
1215 if (session)
1216 transport->destroy_session(session);
1217 else
1218 err = -EINVAL;
1219 break;
1220 case ISCSI_UEVENT_UNBIND_SESSION:
1221 session = iscsi_session_lookup(ev->u.d_session.sid);
1222 if (session)
1223 iscsi_unbind_session(session);
1224 else
1225 err = -EINVAL;
1226 break;
1227 case ISCSI_UEVENT_CREATE_CONN:
1228 err = iscsi_if_create_conn(transport, ev);
1229 break;
1230 case ISCSI_UEVENT_DESTROY_CONN:
1231 err = iscsi_if_destroy_conn(transport, ev);
1232 break;
1233 case ISCSI_UEVENT_BIND_CONN:
1234 session = iscsi_session_lookup(ev->u.b_conn.sid);
1235 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
1236
1237 if (session && conn)
1238 ev->r.retcode = transport->bind_conn(session, conn,
1239 ev->u.b_conn.transport_eph,
1240 ev->u.b_conn.is_leading);
1241 else
1242 err = -EINVAL;
1243 break;
1244 case ISCSI_UEVENT_SET_PARAM:
1245 err = iscsi_set_param(transport, ev);
1246 break;
1247 case ISCSI_UEVENT_START_CONN:
1248 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
1249 if (conn)
1250 ev->r.retcode = transport->start_conn(conn);
1251 else
1252 err = -EINVAL;
1253 break;
1254 case ISCSI_UEVENT_STOP_CONN:
1255 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
1256 if (conn)
1257 transport->stop_conn(conn, ev->u.stop_conn.flag);
1258 else
1259 err = -EINVAL;
1260 break;
1261 case ISCSI_UEVENT_SEND_PDU:
1262 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
1263 if (conn)
1264 ev->r.retcode = transport->send_pdu(conn,
1265 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
1266 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
1267 ev->u.send_pdu.data_size);
1268 else
1269 err = -EINVAL;
1270 break;
1271 case ISCSI_UEVENT_GET_STATS:
1272 err = iscsi_if_get_stats(transport, nlh);
1273 break;
1274 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1275 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1276 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1277 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
1278 break;
1279 case ISCSI_UEVENT_TGT_DSCVR:
1280 err = iscsi_tgt_dscvr(transport, ev);
1281 break;
1282 case ISCSI_UEVENT_SET_HOST_PARAM:
1283 err = iscsi_set_host_param(transport, ev);
1284 break;
1285 default:
1286 err = -ENOSYS;
1287 break;
1288 }
1289
1290 module_put(transport->owner);
1291 return err;
1292 }
1293
1294 /*
1295 * Get message from skb. Each message is processed by iscsi_if_recv_msg.
1296 * Malformed skbs with wrong lengths or invalid creds are not processed.
1297 */
1298 static void
1299 iscsi_if_rx(struct sk_buff *skb)
1300 {
1301 mutex_lock(&rx_queue_mutex);
1302 while (skb->len >= NLMSG_SPACE(0)) {
1303 int err;
1304 uint32_t rlen;
1305 struct nlmsghdr *nlh;
1306 struct iscsi_uevent *ev;
1307
1308 nlh = nlmsg_hdr(skb);
1309 if (nlh->nlmsg_len < sizeof(*nlh) ||
1310 skb->len < nlh->nlmsg_len) {
1311 break;
1312 }
1313
1314 ev = NLMSG_DATA(nlh);
1315 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
1316 if (rlen > skb->len)
1317 rlen = skb->len;
1318
1319 err = iscsi_if_recv_msg(skb, nlh);
1320 if (err) {
1321 ev->type = ISCSI_KEVENT_IF_ERROR;
1322 ev->iferror = err;
1323 }
1324 do {
1325 /*
1326 * special case for GET_STATS:
1327 * on success - sending reply and stats from
1328 * inside of if_recv_msg(),
1329 * on error - fall through.
1330 */
1331 if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
1332 break;
1333 err = iscsi_if_send_reply(
1334 NETLINK_CREDS(skb)->pid, nlh->nlmsg_seq,
1335 nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
1336 } while (err < 0 && err != -ECONNREFUSED);
1337 skb_pull(skb, rlen);
1338 }
1339 mutex_unlock(&rx_queue_mutex);
1340 }
1341
1342 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \
1343 struct device_attribute dev_attr_##_prefix##_##_name = \
1344 __ATTR(_name,_mode,_show,_store)
1345
1346 /*
1347 * iSCSI connection attrs
1348 */
1349 #define iscsi_conn_attr_show(param) \
1350 static ssize_t \
1351 show_conn_param_##param(struct device *dev, \
1352 struct device_attribute *attr, char *buf) \
1353 { \
1354 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \
1355 struct iscsi_transport *t = conn->transport; \
1356 return t->get_conn_param(conn, param, buf); \
1357 }
1358
1359 #define iscsi_conn_attr(field, param) \
1360 iscsi_conn_attr_show(param) \
1361 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param, \
1362 NULL);
1363
1364 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
1365 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
1366 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
1367 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
1368 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
1369 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
1370 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
1371 iscsi_conn_attr(port, ISCSI_PARAM_CONN_PORT);
1372 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
1373 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
1374 iscsi_conn_attr(address, ISCSI_PARAM_CONN_ADDRESS);
1375 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
1376 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
1377
1378 /*
1379 * iSCSI session attrs
1380 */
1381 #define iscsi_session_attr_show(param, perm) \
1382 static ssize_t \
1383 show_session_param_##param(struct device *dev, \
1384 struct device_attribute *attr, char *buf) \
1385 { \
1386 struct iscsi_cls_session *session = \
1387 iscsi_dev_to_session(dev->parent); \
1388 struct iscsi_transport *t = session->transport; \
1389 \
1390 if (perm && !capable(CAP_SYS_ADMIN)) \
1391 return -EACCES; \
1392 return t->get_session_param(session, param, buf); \
1393 }
1394
1395 #define iscsi_session_attr(field, param, perm) \
1396 iscsi_session_attr_show(param, perm) \
1397 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
1398 NULL);
1399
1400 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
1401 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
1402 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
1403 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
1404 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
1405 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
1406 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
1407 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
1408 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
1409 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
1410 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
1411 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
1412 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
1413 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
1414 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
1415 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
1416 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
1417
1418 static ssize_t
1419 show_priv_session_state(struct device *dev, struct device_attribute *attr,
1420 char *buf)
1421 {
1422 struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
1423 return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
1424 }
1425 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
1426 NULL);
1427
1428 #define iscsi_priv_session_attr_show(field, format) \
1429 static ssize_t \
1430 show_priv_session_##field(struct device *dev, \
1431 struct device_attribute *attr, char *buf) \
1432 { \
1433 struct iscsi_cls_session *session = \
1434 iscsi_dev_to_session(dev->parent); \
1435 return sprintf(buf, format"\n", session->field); \
1436 }
1437
1438 #define iscsi_priv_session_attr(field, format) \
1439 iscsi_priv_session_attr_show(field, format) \
1440 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO, show_priv_session_##field, \
1441 NULL)
1442 iscsi_priv_session_attr(recovery_tmo, "%d");
1443
1444 /*
1445 * iSCSI host attrs
1446 */
1447 #define iscsi_host_attr_show(param) \
1448 static ssize_t \
1449 show_host_param_##param(struct device *dev, \
1450 struct device_attribute *attr, char *buf) \
1451 { \
1452 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1453 struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
1454 return priv->iscsi_transport->get_host_param(shost, param, buf); \
1455 }
1456
1457 #define iscsi_host_attr(field, param) \
1458 iscsi_host_attr_show(param) \
1459 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param, \
1460 NULL);
1461
1462 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
1463 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
1464 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
1465 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
1466
1467 #define SETUP_PRIV_SESSION_RD_ATTR(field) \
1468 do { \
1469 priv->session_attrs[count] = &dev_attr_priv_sess_##field; \
1470 count++; \
1471 } while (0)
1472
1473
1474 #define SETUP_SESSION_RD_ATTR(field, param_flag) \
1475 do { \
1476 if (tt->param_mask & param_flag) { \
1477 priv->session_attrs[count] = &dev_attr_sess_##field; \
1478 count++; \
1479 } \
1480 } while (0)
1481
1482 #define SETUP_CONN_RD_ATTR(field, param_flag) \
1483 do { \
1484 if (tt->param_mask & param_flag) { \
1485 priv->conn_attrs[count] = &dev_attr_conn_##field; \
1486 count++; \
1487 } \
1488 } while (0)
1489
1490 #define SETUP_HOST_RD_ATTR(field, param_flag) \
1491 do { \
1492 if (tt->host_param_mask & param_flag) { \
1493 priv->host_attrs[count] = &dev_attr_host_##field; \
1494 count++; \
1495 } \
1496 } while (0)
1497
1498 static int iscsi_session_match(struct attribute_container *cont,
1499 struct device *dev)
1500 {
1501 struct iscsi_cls_session *session;
1502 struct Scsi_Host *shost;
1503 struct iscsi_internal *priv;
1504
1505 if (!iscsi_is_session_dev(dev))
1506 return 0;
1507
1508 session = iscsi_dev_to_session(dev);
1509 shost = iscsi_session_to_shost(session);
1510 if (!shost->transportt)
1511 return 0;
1512
1513 priv = to_iscsi_internal(shost->transportt);
1514 if (priv->session_cont.ac.class != &iscsi_session_class.class)
1515 return 0;
1516
1517 return &priv->session_cont.ac == cont;
1518 }
1519
1520 static int iscsi_conn_match(struct attribute_container *cont,
1521 struct device *dev)
1522 {
1523 struct iscsi_cls_session *session;
1524 struct iscsi_cls_conn *conn;
1525 struct Scsi_Host *shost;
1526 struct iscsi_internal *priv;
1527
1528 if (!iscsi_is_conn_dev(dev))
1529 return 0;
1530
1531 conn = iscsi_dev_to_conn(dev);
1532 session = iscsi_dev_to_session(conn->dev.parent);
1533 shost = iscsi_session_to_shost(session);
1534
1535 if (!shost->transportt)
1536 return 0;
1537
1538 priv = to_iscsi_internal(shost->transportt);
1539 if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
1540 return 0;
1541
1542 return &priv->conn_cont.ac == cont;
1543 }
1544
1545 static int iscsi_host_match(struct attribute_container *cont,
1546 struct device *dev)
1547 {
1548 struct Scsi_Host *shost;
1549 struct iscsi_internal *priv;
1550
1551 if (!scsi_is_host_device(dev))
1552 return 0;
1553
1554 shost = dev_to_shost(dev);
1555 if (!shost->transportt ||
1556 shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
1557 return 0;
1558
1559 priv = to_iscsi_internal(shost->transportt);
1560 return &priv->t.host_attrs.ac == cont;
1561 }
1562
1563 struct scsi_transport_template *
1564 iscsi_register_transport(struct iscsi_transport *tt)
1565 {
1566 struct iscsi_internal *priv;
1567 unsigned long flags;
1568 int count = 0, err;
1569
1570 BUG_ON(!tt);
1571
1572 priv = iscsi_if_transport_lookup(tt);
1573 if (priv)
1574 return NULL;
1575
1576 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1577 if (!priv)
1578 return NULL;
1579 INIT_LIST_HEAD(&priv->list);
1580 priv->daemon_pid = -1;
1581 priv->iscsi_transport = tt;
1582 priv->t.user_scan = iscsi_user_scan;
1583
1584 priv->dev.class = &iscsi_transport_class;
1585 snprintf(priv->dev.bus_id, BUS_ID_SIZE, "%s", tt->name);
1586 err = device_register(&priv->dev);
1587 if (err)
1588 goto free_priv;
1589
1590 err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
1591 if (err)
1592 goto unregister_dev;
1593
1594 /* host parameters */
1595 priv->t.host_attrs.ac.attrs = &priv->host_attrs[0];
1596 priv->t.host_attrs.ac.class = &iscsi_host_class.class;
1597 priv->t.host_attrs.ac.match = iscsi_host_match;
1598 priv->t.host_size = sizeof(struct iscsi_host);
1599 transport_container_register(&priv->t.host_attrs);
1600
1601 SETUP_HOST_RD_ATTR(netdev, ISCSI_HOST_NETDEV_NAME);
1602 SETUP_HOST_RD_ATTR(ipaddress, ISCSI_HOST_IPADDRESS);
1603 SETUP_HOST_RD_ATTR(hwaddress, ISCSI_HOST_HWADDRESS);
1604 SETUP_HOST_RD_ATTR(initiatorname, ISCSI_HOST_INITIATOR_NAME);
1605 BUG_ON(count > ISCSI_HOST_ATTRS);
1606 priv->host_attrs[count] = NULL;
1607 count = 0;
1608
1609 /* connection parameters */
1610 priv->conn_cont.ac.attrs = &priv->conn_attrs[0];
1611 priv->conn_cont.ac.class = &iscsi_connection_class.class;
1612 priv->conn_cont.ac.match = iscsi_conn_match;
1613 transport_container_register(&priv->conn_cont);
1614
1615 SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_MAX_RECV_DLENGTH);
1616 SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_MAX_XMIT_DLENGTH);
1617 SETUP_CONN_RD_ATTR(header_digest, ISCSI_HDRDGST_EN);
1618 SETUP_CONN_RD_ATTR(data_digest, ISCSI_DATADGST_EN);
1619 SETUP_CONN_RD_ATTR(ifmarker, ISCSI_IFMARKER_EN);
1620 SETUP_CONN_RD_ATTR(ofmarker, ISCSI_OFMARKER_EN);
1621 SETUP_CONN_RD_ATTR(address, ISCSI_CONN_ADDRESS);
1622 SETUP_CONN_RD_ATTR(port, ISCSI_CONN_PORT);
1623 SETUP_CONN_RD_ATTR(exp_statsn, ISCSI_EXP_STATSN);
1624 SETUP_CONN_RD_ATTR(persistent_address, ISCSI_PERSISTENT_ADDRESS);
1625 SETUP_CONN_RD_ATTR(persistent_port, ISCSI_PERSISTENT_PORT);
1626 SETUP_CONN_RD_ATTR(ping_tmo, ISCSI_PING_TMO);
1627 SETUP_CONN_RD_ATTR(recv_tmo, ISCSI_RECV_TMO);
1628
1629 BUG_ON(count > ISCSI_CONN_ATTRS);
1630 priv->conn_attrs[count] = NULL;
1631 count = 0;
1632
1633 /* session parameters */
1634 priv->session_cont.ac.attrs = &priv->session_attrs[0];
1635 priv->session_cont.ac.class = &iscsi_session_class.class;
1636 priv->session_cont.ac.match = iscsi_session_match;
1637 transport_container_register(&priv->session_cont);
1638
1639 SETUP_SESSION_RD_ATTR(initial_r2t, ISCSI_INITIAL_R2T_EN);
1640 SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_MAX_R2T);
1641 SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_IMM_DATA_EN);
1642 SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_FIRST_BURST);
1643 SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_MAX_BURST);
1644 SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PDU_INORDER_EN);
1645 SETUP_SESSION_RD_ATTR(data_seq_in_order, ISCSI_DATASEQ_INORDER_EN);
1646 SETUP_SESSION_RD_ATTR(erl, ISCSI_ERL);
1647 SETUP_SESSION_RD_ATTR(targetname, ISCSI_TARGET_NAME);
1648 SETUP_SESSION_RD_ATTR(tpgt, ISCSI_TPGT);
1649 SETUP_SESSION_RD_ATTR(password, ISCSI_USERNAME);
1650 SETUP_SESSION_RD_ATTR(password_in, ISCSI_USERNAME_IN);
1651 SETUP_SESSION_RD_ATTR(username, ISCSI_PASSWORD);
1652 SETUP_SESSION_RD_ATTR(username_in, ISCSI_PASSWORD_IN);
1653 SETUP_SESSION_RD_ATTR(fast_abort, ISCSI_FAST_ABORT);
1654 SETUP_SESSION_RD_ATTR(abort_tmo, ISCSI_ABORT_TMO);
1655 SETUP_SESSION_RD_ATTR(lu_reset_tmo,ISCSI_LU_RESET_TMO);
1656 SETUP_PRIV_SESSION_RD_ATTR(recovery_tmo);
1657 SETUP_PRIV_SESSION_RD_ATTR(state);
1658
1659 BUG_ON(count > ISCSI_SESSION_ATTRS);
1660 priv->session_attrs[count] = NULL;
1661
1662 spin_lock_irqsave(&iscsi_transport_lock, flags);
1663 list_add(&priv->list, &iscsi_transports);
1664 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1665
1666 printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
1667 return &priv->t;
1668
1669 unregister_dev:
1670 device_unregister(&priv->dev);
1671 free_priv:
1672 kfree(priv);
1673 return NULL;
1674 }
1675 EXPORT_SYMBOL_GPL(iscsi_register_transport);
1676
1677 int iscsi_unregister_transport(struct iscsi_transport *tt)
1678 {
1679 struct iscsi_internal *priv;
1680 unsigned long flags;
1681
1682 BUG_ON(!tt);
1683
1684 mutex_lock(&rx_queue_mutex);
1685
1686 priv = iscsi_if_transport_lookup(tt);
1687 BUG_ON (!priv);
1688
1689 spin_lock_irqsave(&iscsi_transport_lock, flags);
1690 list_del(&priv->list);
1691 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1692
1693 transport_container_unregister(&priv->conn_cont);
1694 transport_container_unregister(&priv->session_cont);
1695 transport_container_unregister(&priv->t.host_attrs);
1696
1697 sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
1698 device_unregister(&priv->dev);
1699 mutex_unlock(&rx_queue_mutex);
1700
1701 return 0;
1702 }
1703 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
1704
1705 static __init int iscsi_transport_init(void)
1706 {
1707 int err;
1708
1709 printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
1710 ISCSI_TRANSPORT_VERSION);
1711
1712 atomic_set(&iscsi_session_nr, 0);
1713
1714 err = class_register(&iscsi_transport_class);
1715 if (err)
1716 return err;
1717
1718 err = transport_class_register(&iscsi_host_class);
1719 if (err)
1720 goto unregister_transport_class;
1721
1722 err = transport_class_register(&iscsi_connection_class);
1723 if (err)
1724 goto unregister_host_class;
1725
1726 err = transport_class_register(&iscsi_session_class);
1727 if (err)
1728 goto unregister_conn_class;
1729
1730 nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, 1, iscsi_if_rx, NULL,
1731 THIS_MODULE);
1732 if (!nls) {
1733 err = -ENOBUFS;
1734 goto unregister_session_class;
1735 }
1736
1737 iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
1738 if (!iscsi_eh_timer_workq)
1739 goto release_nls;
1740
1741 return 0;
1742
1743 release_nls:
1744 netlink_kernel_release(nls);
1745 unregister_session_class:
1746 transport_class_unregister(&iscsi_session_class);
1747 unregister_conn_class:
1748 transport_class_unregister(&iscsi_connection_class);
1749 unregister_host_class:
1750 transport_class_unregister(&iscsi_host_class);
1751 unregister_transport_class:
1752 class_unregister(&iscsi_transport_class);
1753 return err;
1754 }
1755
1756 static void __exit iscsi_transport_exit(void)
1757 {
1758 destroy_workqueue(iscsi_eh_timer_workq);
1759 netlink_kernel_release(nls);
1760 transport_class_unregister(&iscsi_connection_class);
1761 transport_class_unregister(&iscsi_session_class);
1762 transport_class_unregister(&iscsi_host_class);
1763 class_unregister(&iscsi_transport_class);
1764 }
1765
1766 module_init(iscsi_transport_init);
1767 module_exit(iscsi_transport_exit);
1768
1769 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
1770 "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
1771 "Alex Aizman <itn780@yahoo.com>");
1772 MODULE_DESCRIPTION("iSCSI Transport Interface");
1773 MODULE_LICENSE("GPL");
1774 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
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