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 <linux/slab.h>
26 #include <net/tcp.h>
27 #include <scsi/scsi.h>
28 #include <scsi/scsi_host.h>
29 #include <scsi/scsi_device.h>
30 #include <scsi/scsi_transport.h>
31 #include <scsi/scsi_transport_iscsi.h>
32 #include <scsi/iscsi_if.h>
33 #include <scsi/scsi_cmnd.h>
34
35 #define ISCSI_SESSION_ATTRS 23
36 #define ISCSI_CONN_ATTRS 13
37 #define ISCSI_HOST_ATTRS 4
38
39 #define ISCSI_TRANSPORT_VERSION "2.0-870"
40
41 static int dbg_session;
42 module_param_named(debug_session, dbg_session, int,
43 S_IRUGO | S_IWUSR);
44 MODULE_PARM_DESC(debug_session,
45 "Turn on debugging for sessions in scsi_transport_iscsi "
46 "module. Set to 1 to turn on, and zero to turn off. Default "
47 "is off.");
48
49 static int dbg_conn;
50 module_param_named(debug_conn, dbg_conn, int,
51 S_IRUGO | S_IWUSR);
52 MODULE_PARM_DESC(debug_conn,
53 "Turn on debugging for connections in scsi_transport_iscsi "
54 "module. Set to 1 to turn on, and zero to turn off. Default "
55 "is off.");
56
57 #define ISCSI_DBG_TRANS_SESSION(_session, dbg_fmt, arg...) \
58 do { \
59 if (dbg_session) \
60 iscsi_cls_session_printk(KERN_INFO, _session, \
61 "%s: " dbg_fmt, \
62 __func__, ##arg); \
63 } while (0);
64
65 #define ISCSI_DBG_TRANS_CONN(_conn, dbg_fmt, arg...) \
66 do { \
67 if (dbg_conn) \
68 iscsi_cls_conn_printk(KERN_INFO, _conn, \
69 "%s: " dbg_fmt, \
70 __func__, ##arg); \
71 } while (0);
72
73 struct iscsi_internal {
74 struct scsi_transport_template t;
75 struct iscsi_transport *iscsi_transport;
76 struct list_head list;
77 struct device dev;
78
79 struct device_attribute *host_attrs[ISCSI_HOST_ATTRS + 1];
80 struct transport_container conn_cont;
81 struct device_attribute *conn_attrs[ISCSI_CONN_ATTRS + 1];
82 struct transport_container session_cont;
83 struct device_attribute *session_attrs[ISCSI_SESSION_ATTRS + 1];
84 };
85
86 static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
87 static struct workqueue_struct *iscsi_eh_timer_workq;
88
89 /*
90 * list of registered transports and lock that must
91 * be held while accessing list. The iscsi_transport_lock must
92 * be acquired after the rx_queue_mutex.
93 */
94 static LIST_HEAD(iscsi_transports);
95 static DEFINE_SPINLOCK(iscsi_transport_lock);
96
97 #define to_iscsi_internal(tmpl) \
98 container_of(tmpl, struct iscsi_internal, t)
99
100 #define dev_to_iscsi_internal(_dev) \
101 container_of(_dev, struct iscsi_internal, dev)
102
iscsi_transport_release(struct device * dev)103 static void iscsi_transport_release(struct device *dev)
104 {
105 struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
106 kfree(priv);
107 }
108
109 /*
110 * iscsi_transport_class represents the iscsi_transports that are
111 * registered.
112 */
113 static struct class iscsi_transport_class = {
114 .name = "iscsi_transport",
115 .dev_release = iscsi_transport_release,
116 };
117
118 static ssize_t
show_transport_handle(struct device * dev,struct device_attribute * attr,char * buf)119 show_transport_handle(struct device *dev, struct device_attribute *attr,
120 char *buf)
121 {
122 struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
123 return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport));
124 }
125 static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
126
127 #define show_transport_attr(name, format) \
128 static ssize_t \
129 show_transport_##name(struct device *dev, \
130 struct device_attribute *attr,char *buf) \
131 { \
132 struct iscsi_internal *priv = dev_to_iscsi_internal(dev); \
133 return sprintf(buf, format"\n", priv->iscsi_transport->name); \
134 } \
135 static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
136
137 show_transport_attr(caps, "0x%x");
138
139 static struct attribute *iscsi_transport_attrs[] = {
140 &dev_attr_handle.attr,
141 &dev_attr_caps.attr,
142 NULL,
143 };
144
145 static struct attribute_group iscsi_transport_group = {
146 .attrs = iscsi_transport_attrs,
147 };
148
149 /*
150 * iSCSI endpoint attrs
151 */
152 #define iscsi_dev_to_endpoint(_dev) \
153 container_of(_dev, struct iscsi_endpoint, dev)
154
155 #define ISCSI_ATTR(_prefix,_name,_mode,_show,_store) \
156 struct device_attribute dev_attr_##_prefix##_##_name = \
157 __ATTR(_name,_mode,_show,_store)
158
iscsi_endpoint_release(struct device * dev)159 static void iscsi_endpoint_release(struct device *dev)
160 {
161 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
162 kfree(ep);
163 }
164
165 static struct class iscsi_endpoint_class = {
166 .name = "iscsi_endpoint",
167 .dev_release = iscsi_endpoint_release,
168 };
169
170 static ssize_t
show_ep_handle(struct device * dev,struct device_attribute * attr,char * buf)171 show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
172 {
173 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
174 return sprintf(buf, "%llu\n", (unsigned long long) ep->id);
175 }
176 static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
177
178 static struct attribute *iscsi_endpoint_attrs[] = {
179 &dev_attr_ep_handle.attr,
180 NULL,
181 };
182
183 static struct attribute_group iscsi_endpoint_group = {
184 .attrs = iscsi_endpoint_attrs,
185 };
186
187 #define ISCSI_MAX_EPID -1
188
iscsi_match_epid(struct device * dev,void * data)189 static int iscsi_match_epid(struct device *dev, void *data)
190 {
191 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
192 uint64_t *epid = (uint64_t *) data;
193
194 return *epid == ep->id;
195 }
196
197 struct iscsi_endpoint *
iscsi_create_endpoint(int dd_size)198 iscsi_create_endpoint(int dd_size)
199 {
200 struct device *dev;
201 struct iscsi_endpoint *ep;
202 uint64_t id;
203 int err;
204
205 for (id = 1; id < ISCSI_MAX_EPID; id++) {
206 dev = class_find_device(&iscsi_endpoint_class, NULL, &id,
207 iscsi_match_epid);
208 if (!dev)
209 break;
210 }
211 if (id == ISCSI_MAX_EPID) {
212 printk(KERN_ERR "Too many connections. Max supported %u\n",
213 ISCSI_MAX_EPID - 1);
214 return NULL;
215 }
216
217 ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL);
218 if (!ep)
219 return NULL;
220
221 ep->id = id;
222 ep->dev.class = &iscsi_endpoint_class;
223 dev_set_name(&ep->dev, "ep-%llu", (unsigned long long) id);
224 err = device_register(&ep->dev);
225 if (err)
226 goto free_ep;
227
228 err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group);
229 if (err)
230 goto unregister_dev;
231
232 if (dd_size)
233 ep->dd_data = &ep[1];
234 return ep;
235
236 unregister_dev:
237 device_unregister(&ep->dev);
238 return NULL;
239
240 free_ep:
241 kfree(ep);
242 return NULL;
243 }
244 EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
245
iscsi_destroy_endpoint(struct iscsi_endpoint * ep)246 void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
247 {
248 sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
249 device_unregister(&ep->dev);
250 }
251 EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
252
iscsi_lookup_endpoint(u64 handle)253 struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
254 {
255 struct iscsi_endpoint *ep;
256 struct device *dev;
257
258 dev = class_find_device(&iscsi_endpoint_class, NULL, &handle,
259 iscsi_match_epid);
260 if (!dev)
261 return NULL;
262
263 ep = iscsi_dev_to_endpoint(dev);
264 /*
265 * we can drop this now because the interface will prevent
266 * removals and lookups from racing.
267 */
268 put_device(dev);
269 return ep;
270 }
271 EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
272
iscsi_setup_host(struct transport_container * tc,struct device * dev,struct device * cdev)273 static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
274 struct device *cdev)
275 {
276 struct Scsi_Host *shost = dev_to_shost(dev);
277 struct iscsi_cls_host *ihost = shost->shost_data;
278
279 memset(ihost, 0, sizeof(*ihost));
280 atomic_set(&ihost->nr_scans, 0);
281 mutex_init(&ihost->mutex);
282 return 0;
283 }
284
285 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
286 "iscsi_host",
287 iscsi_setup_host,
288 NULL,
289 NULL);
290
291 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
292 "iscsi_session",
293 NULL,
294 NULL,
295 NULL);
296
297 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
298 "iscsi_connection",
299 NULL,
300 NULL,
301 NULL);
302
303 static struct sock *nls;
304 static DEFINE_MUTEX(rx_queue_mutex);
305
306 static LIST_HEAD(sesslist);
307 static DEFINE_SPINLOCK(sesslock);
308 static LIST_HEAD(connlist);
309 static DEFINE_SPINLOCK(connlock);
310
iscsi_conn_get_sid(struct iscsi_cls_conn * conn)311 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
312 {
313 struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
314 return sess->sid;
315 }
316
317 /*
318 * Returns the matching session to a given sid
319 */
iscsi_session_lookup(uint32_t sid)320 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
321 {
322 unsigned long flags;
323 struct iscsi_cls_session *sess;
324
325 spin_lock_irqsave(&sesslock, flags);
326 list_for_each_entry(sess, &sesslist, sess_list) {
327 if (sess->sid == sid) {
328 spin_unlock_irqrestore(&sesslock, flags);
329 return sess;
330 }
331 }
332 spin_unlock_irqrestore(&sesslock, flags);
333 return NULL;
334 }
335
336 /*
337 * Returns the matching connection to a given sid / cid tuple
338 */
iscsi_conn_lookup(uint32_t sid,uint32_t cid)339 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
340 {
341 unsigned long flags;
342 struct iscsi_cls_conn *conn;
343
344 spin_lock_irqsave(&connlock, flags);
345 list_for_each_entry(conn, &connlist, conn_list) {
346 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
347 spin_unlock_irqrestore(&connlock, flags);
348 return conn;
349 }
350 }
351 spin_unlock_irqrestore(&connlock, flags);
352 return NULL;
353 }
354
355 /*
356 * The following functions can be used by LLDs that allocate
357 * their own scsi_hosts or by software iscsi LLDs
358 */
359 static struct {
360 int value;
361 char *name;
362 } iscsi_session_state_names[] = {
363 { ISCSI_SESSION_LOGGED_IN, "LOGGED_IN" },
364 { ISCSI_SESSION_FAILED, "FAILED" },
365 { ISCSI_SESSION_FREE, "FREE" },
366 };
367
iscsi_session_state_name(int state)368 static const char *iscsi_session_state_name(int state)
369 {
370 int i;
371 char *name = NULL;
372
373 for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
374 if (iscsi_session_state_names[i].value == state) {
375 name = iscsi_session_state_names[i].name;
376 break;
377 }
378 }
379 return name;
380 }
381
iscsi_session_chkready(struct iscsi_cls_session * session)382 int iscsi_session_chkready(struct iscsi_cls_session *session)
383 {
384 unsigned long flags;
385 int err;
386
387 spin_lock_irqsave(&session->lock, flags);
388 switch (session->state) {
389 case ISCSI_SESSION_LOGGED_IN:
390 err = 0;
391 break;
392 case ISCSI_SESSION_FAILED:
393 err = DID_IMM_RETRY << 16;
394 break;
395 case ISCSI_SESSION_FREE:
396 err = DID_TRANSPORT_FAILFAST << 16;
397 break;
398 default:
399 err = DID_NO_CONNECT << 16;
400 break;
401 }
402 spin_unlock_irqrestore(&session->lock, flags);
403 return err;
404 }
405 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
406
iscsi_session_release(struct device * dev)407 static void iscsi_session_release(struct device *dev)
408 {
409 struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
410 struct Scsi_Host *shost;
411
412 shost = iscsi_session_to_shost(session);
413 scsi_host_put(shost);
414 ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
415 kfree(session);
416 }
417
iscsi_is_session_dev(const struct device * dev)418 static int iscsi_is_session_dev(const struct device *dev)
419 {
420 return dev->release == iscsi_session_release;
421 }
422
iscsi_iter_session_fn(struct device * dev,void * data)423 static int iscsi_iter_session_fn(struct device *dev, void *data)
424 {
425 void (* fn) (struct iscsi_cls_session *) = data;
426
427 if (!iscsi_is_session_dev(dev))
428 return 0;
429 fn(iscsi_dev_to_session(dev));
430 return 0;
431 }
432
iscsi_host_for_each_session(struct Scsi_Host * shost,void (* fn)(struct iscsi_cls_session *))433 void iscsi_host_for_each_session(struct Scsi_Host *shost,
434 void (*fn)(struct iscsi_cls_session *))
435 {
436 device_for_each_child(&shost->shost_gendev, fn,
437 iscsi_iter_session_fn);
438 }
439 EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
440
441 /**
442 * iscsi_scan_finished - helper to report when running scans are done
443 * @shost: scsi host
444 * @time: scan run time
445 *
446 * This function can be used by drives like qla4xxx to report to the scsi
447 * layer when the scans it kicked off at module load time are done.
448 */
iscsi_scan_finished(struct Scsi_Host * shost,unsigned long time)449 int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
450 {
451 struct iscsi_cls_host *ihost = shost->shost_data;
452 /*
453 * qla4xxx will have kicked off some session unblocks before calling
454 * scsi_scan_host, so just wait for them to complete.
455 */
456 return !atomic_read(&ihost->nr_scans);
457 }
458 EXPORT_SYMBOL_GPL(iscsi_scan_finished);
459
460 struct iscsi_scan_data {
461 unsigned int channel;
462 unsigned int id;
463 unsigned int lun;
464 };
465
iscsi_user_scan_session(struct device * dev,void * data)466 static int iscsi_user_scan_session(struct device *dev, void *data)
467 {
468 struct iscsi_scan_data *scan_data = data;
469 struct iscsi_cls_session *session;
470 struct Scsi_Host *shost;
471 struct iscsi_cls_host *ihost;
472 unsigned long flags;
473 unsigned int id;
474
475 if (!iscsi_is_session_dev(dev))
476 return 0;
477
478 session = iscsi_dev_to_session(dev);
479
480 ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
481
482 shost = iscsi_session_to_shost(session);
483 ihost = shost->shost_data;
484
485 mutex_lock(&ihost->mutex);
486 spin_lock_irqsave(&session->lock, flags);
487 if (session->state != ISCSI_SESSION_LOGGED_IN) {
488 spin_unlock_irqrestore(&session->lock, flags);
489 goto user_scan_exit;
490 }
491 id = session->target_id;
492 spin_unlock_irqrestore(&session->lock, flags);
493
494 if (id != ISCSI_MAX_TARGET) {
495 if ((scan_data->channel == SCAN_WILD_CARD ||
496 scan_data->channel == 0) &&
497 (scan_data->id == SCAN_WILD_CARD ||
498 scan_data->id == id))
499 scsi_scan_target(&session->dev, 0, id,
500 scan_data->lun, 1);
501 }
502
503 user_scan_exit:
504 mutex_unlock(&ihost->mutex);
505 ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
506 return 0;
507 }
508
iscsi_user_scan(struct Scsi_Host * shost,uint channel,uint id,uint lun)509 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
510 uint id, uint lun)
511 {
512 struct iscsi_scan_data scan_data;
513
514 scan_data.channel = channel;
515 scan_data.id = id;
516 scan_data.lun = lun;
517
518 return device_for_each_child(&shost->shost_gendev, &scan_data,
519 iscsi_user_scan_session);
520 }
521
iscsi_scan_session(struct work_struct * work)522 static void iscsi_scan_session(struct work_struct *work)
523 {
524 struct iscsi_cls_session *session =
525 container_of(work, struct iscsi_cls_session, scan_work);
526 struct Scsi_Host *shost = iscsi_session_to_shost(session);
527 struct iscsi_cls_host *ihost = shost->shost_data;
528 struct iscsi_scan_data scan_data;
529
530 scan_data.channel = 0;
531 scan_data.id = SCAN_WILD_CARD;
532 scan_data.lun = SCAN_WILD_CARD;
533
534 iscsi_user_scan_session(&session->dev, &scan_data);
535 atomic_dec(&ihost->nr_scans);
536 }
537
538 /**
539 * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
540 * @cmd: scsi cmd passed to scsi eh handler
541 *
542 * If the session is down this function will wait for the recovery
543 * timer to fire or for the session to be logged back in. If the
544 * recovery timer fires then FAST_IO_FAIL is returned. The caller
545 * should pass this error value to the scsi eh.
546 */
iscsi_block_scsi_eh(struct scsi_cmnd * cmd)547 int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
548 {
549 struct iscsi_cls_session *session =
550 starget_to_session(scsi_target(cmd->device));
551 unsigned long flags;
552 int ret = 0;
553
554 spin_lock_irqsave(&session->lock, flags);
555 while (session->state != ISCSI_SESSION_LOGGED_IN) {
556 if (session->state == ISCSI_SESSION_FREE) {
557 ret = FAST_IO_FAIL;
558 break;
559 }
560 spin_unlock_irqrestore(&session->lock, flags);
561 msleep(1000);
562 spin_lock_irqsave(&session->lock, flags);
563 }
564 spin_unlock_irqrestore(&session->lock, flags);
565 return ret;
566 }
567 EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
568
session_recovery_timedout(struct work_struct * work)569 static void session_recovery_timedout(struct work_struct *work)
570 {
571 struct iscsi_cls_session *session =
572 container_of(work, struct iscsi_cls_session,
573 recovery_work.work);
574 unsigned long flags;
575
576 iscsi_cls_session_printk(KERN_INFO, session,
577 "session recovery timed out after %d secs\n",
578 session->recovery_tmo);
579
580 spin_lock_irqsave(&session->lock, flags);
581 switch (session->state) {
582 case ISCSI_SESSION_FAILED:
583 session->state = ISCSI_SESSION_FREE;
584 break;
585 case ISCSI_SESSION_LOGGED_IN:
586 case ISCSI_SESSION_FREE:
587 /* we raced with the unblock's flush */
588 spin_unlock_irqrestore(&session->lock, flags);
589 return;
590 }
591 spin_unlock_irqrestore(&session->lock, flags);
592
593 if (session->transport->session_recovery_timedout)
594 session->transport->session_recovery_timedout(session);
595
596 ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
597 scsi_target_unblock(&session->dev);
598 ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
599 }
600
__iscsi_unblock_session(struct work_struct * work)601 static void __iscsi_unblock_session(struct work_struct *work)
602 {
603 struct iscsi_cls_session *session =
604 container_of(work, struct iscsi_cls_session,
605 unblock_work);
606 struct Scsi_Host *shost = iscsi_session_to_shost(session);
607 struct iscsi_cls_host *ihost = shost->shost_data;
608 unsigned long flags;
609
610 ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
611 /*
612 * The recovery and unblock work get run from the same workqueue,
613 * so try to cancel it if it was going to run after this unblock.
614 */
615 cancel_delayed_work(&session->recovery_work);
616 spin_lock_irqsave(&session->lock, flags);
617 session->state = ISCSI_SESSION_LOGGED_IN;
618 spin_unlock_irqrestore(&session->lock, flags);
619 /* start IO */
620 scsi_target_unblock(&session->dev);
621 /*
622 * Only do kernel scanning if the driver is properly hooked into
623 * the async scanning code (drivers like iscsi_tcp do login and
624 * scanning from userspace).
625 */
626 if (shost->hostt->scan_finished) {
627 if (scsi_queue_work(shost, &session->scan_work))
628 atomic_inc(&ihost->nr_scans);
629 }
630 ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
631 }
632
633 /**
634 * iscsi_unblock_session - set a session as logged in and start IO.
635 * @session: iscsi session
636 *
637 * Mark a session as ready to accept IO.
638 */
iscsi_unblock_session(struct iscsi_cls_session * session)639 void iscsi_unblock_session(struct iscsi_cls_session *session)
640 {
641 queue_work(iscsi_eh_timer_workq, &session->unblock_work);
642 /*
643 * make sure all the events have completed before tell the driver
644 * it is safe
645 */
646 flush_workqueue(iscsi_eh_timer_workq);
647 }
648 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
649
__iscsi_block_session(struct work_struct * work)650 static void __iscsi_block_session(struct work_struct *work)
651 {
652 struct iscsi_cls_session *session =
653 container_of(work, struct iscsi_cls_session,
654 block_work);
655 unsigned long flags;
656
657 ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
658 spin_lock_irqsave(&session->lock, flags);
659 session->state = ISCSI_SESSION_FAILED;
660 spin_unlock_irqrestore(&session->lock, flags);
661 scsi_target_block(&session->dev);
662 ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
663 if (session->recovery_tmo >= 0)
664 queue_delayed_work(iscsi_eh_timer_workq,
665 &session->recovery_work,
666 session->recovery_tmo * HZ);
667 }
668
iscsi_block_session(struct iscsi_cls_session * session)669 void iscsi_block_session(struct iscsi_cls_session *session)
670 {
671 queue_work(iscsi_eh_timer_workq, &session->block_work);
672 }
673 EXPORT_SYMBOL_GPL(iscsi_block_session);
674
__iscsi_unbind_session(struct work_struct * work)675 static void __iscsi_unbind_session(struct work_struct *work)
676 {
677 struct iscsi_cls_session *session =
678 container_of(work, struct iscsi_cls_session,
679 unbind_work);
680 struct Scsi_Host *shost = iscsi_session_to_shost(session);
681 struct iscsi_cls_host *ihost = shost->shost_data;
682 unsigned long flags;
683
684 ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
685
686 /* Prevent new scans and make sure scanning is not in progress */
687 mutex_lock(&ihost->mutex);
688 spin_lock_irqsave(&session->lock, flags);
689 if (session->target_id == ISCSI_MAX_TARGET) {
690 spin_unlock_irqrestore(&session->lock, flags);
691 mutex_unlock(&ihost->mutex);
692 return;
693 }
694 session->target_id = ISCSI_MAX_TARGET;
695 spin_unlock_irqrestore(&session->lock, flags);
696 mutex_unlock(&ihost->mutex);
697
698 scsi_remove_target(&session->dev);
699 iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
700 ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
701 }
702
703 struct iscsi_cls_session *
iscsi_alloc_session(struct Scsi_Host * shost,struct iscsi_transport * transport,int dd_size)704 iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
705 int dd_size)
706 {
707 struct iscsi_cls_session *session;
708
709 session = kzalloc(sizeof(*session) + dd_size,
710 GFP_KERNEL);
711 if (!session)
712 return NULL;
713
714 session->transport = transport;
715 session->recovery_tmo = 120;
716 session->state = ISCSI_SESSION_FREE;
717 INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
718 INIT_LIST_HEAD(&session->sess_list);
719 INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
720 INIT_WORK(&session->block_work, __iscsi_block_session);
721 INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
722 INIT_WORK(&session->scan_work, iscsi_scan_session);
723 spin_lock_init(&session->lock);
724
725 /* this is released in the dev's release function */
726 scsi_host_get(shost);
727 session->dev.parent = &shost->shost_gendev;
728 session->dev.release = iscsi_session_release;
729 device_initialize(&session->dev);
730 if (dd_size)
731 session->dd_data = &session[1];
732
733 ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
734 return session;
735 }
736 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
737
iscsi_get_next_target_id(struct device * dev,void * data)738 static int iscsi_get_next_target_id(struct device *dev, void *data)
739 {
740 struct iscsi_cls_session *session;
741 unsigned long flags;
742 int err = 0;
743
744 if (!iscsi_is_session_dev(dev))
745 return 0;
746
747 session = iscsi_dev_to_session(dev);
748 spin_lock_irqsave(&session->lock, flags);
749 if (*((unsigned int *) data) == session->target_id)
750 err = -EEXIST;
751 spin_unlock_irqrestore(&session->lock, flags);
752 return err;
753 }
754
iscsi_add_session(struct iscsi_cls_session * session,unsigned int target_id)755 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
756 {
757 struct Scsi_Host *shost = iscsi_session_to_shost(session);
758 struct iscsi_cls_host *ihost;
759 unsigned long flags;
760 unsigned int id = target_id;
761 int err;
762
763 ihost = shost->shost_data;
764 session->sid = atomic_add_return(1, &iscsi_session_nr);
765
766 if (id == ISCSI_MAX_TARGET) {
767 for (id = 0; id < ISCSI_MAX_TARGET; id++) {
768 err = device_for_each_child(&shost->shost_gendev, &id,
769 iscsi_get_next_target_id);
770 if (!err)
771 break;
772 }
773
774 if (id == ISCSI_MAX_TARGET) {
775 iscsi_cls_session_printk(KERN_ERR, session,
776 "Too many iscsi targets. Max "
777 "number of targets is %d.\n",
778 ISCSI_MAX_TARGET - 1);
779 err = -EOVERFLOW;
780 goto release_host;
781 }
782 }
783 session->target_id = id;
784
785 dev_set_name(&session->dev, "session%u", session->sid);
786 err = device_add(&session->dev);
787 if (err) {
788 iscsi_cls_session_printk(KERN_ERR, session,
789 "could not register session's dev\n");
790 goto release_host;
791 }
792 transport_register_device(&session->dev);
793
794 spin_lock_irqsave(&sesslock, flags);
795 list_add(&session->sess_list, &sesslist);
796 spin_unlock_irqrestore(&sesslock, flags);
797
798 iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
799 ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
800 return 0;
801
802 release_host:
803 scsi_host_put(shost);
804 return err;
805 }
806 EXPORT_SYMBOL_GPL(iscsi_add_session);
807
808 /**
809 * iscsi_create_session - create iscsi class session
810 * @shost: scsi host
811 * @transport: iscsi transport
812 * @dd_size: private driver data size
813 * @target_id: which target
814 *
815 * This can be called from a LLD or iscsi_transport.
816 */
817 struct iscsi_cls_session *
iscsi_create_session(struct Scsi_Host * shost,struct iscsi_transport * transport,int dd_size,unsigned int target_id)818 iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
819 int dd_size, unsigned int target_id)
820 {
821 struct iscsi_cls_session *session;
822
823 session = iscsi_alloc_session(shost, transport, dd_size);
824 if (!session)
825 return NULL;
826
827 if (iscsi_add_session(session, target_id)) {
828 iscsi_free_session(session);
829 return NULL;
830 }
831 return session;
832 }
833 EXPORT_SYMBOL_GPL(iscsi_create_session);
834
iscsi_conn_release(struct device * dev)835 static void iscsi_conn_release(struct device *dev)
836 {
837 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
838 struct device *parent = conn->dev.parent;
839
840 ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
841 kfree(conn);
842 put_device(parent);
843 }
844
iscsi_is_conn_dev(const struct device * dev)845 static int iscsi_is_conn_dev(const struct device *dev)
846 {
847 return dev->release == iscsi_conn_release;
848 }
849
iscsi_iter_destroy_conn_fn(struct device * dev,void * data)850 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
851 {
852 if (!iscsi_is_conn_dev(dev))
853 return 0;
854 return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
855 }
856
iscsi_remove_session(struct iscsi_cls_session * session)857 void iscsi_remove_session(struct iscsi_cls_session *session)
858 {
859 struct Scsi_Host *shost = iscsi_session_to_shost(session);
860 unsigned long flags;
861 int err;
862
863 ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
864
865 spin_lock_irqsave(&sesslock, flags);
866 list_del(&session->sess_list);
867 spin_unlock_irqrestore(&sesslock, flags);
868
869 /* make sure there are no blocks/unblocks queued */
870 flush_workqueue(iscsi_eh_timer_workq);
871 /* make sure the timedout callout is not running */
872 if (!cancel_delayed_work(&session->recovery_work))
873 flush_workqueue(iscsi_eh_timer_workq);
874 /*
875 * If we are blocked let commands flow again. The lld or iscsi
876 * layer should set up the queuecommand to fail commands.
877 * We assume that LLD will not be calling block/unblock while
878 * removing the session.
879 */
880 spin_lock_irqsave(&session->lock, flags);
881 session->state = ISCSI_SESSION_FREE;
882 spin_unlock_irqrestore(&session->lock, flags);
883
884 scsi_target_unblock(&session->dev);
885 /* flush running scans then delete devices */
886 scsi_flush_work(shost);
887 __iscsi_unbind_session(&session->unbind_work);
888
889 /* hw iscsi may not have removed all connections from session */
890 err = device_for_each_child(&session->dev, NULL,
891 iscsi_iter_destroy_conn_fn);
892 if (err)
893 iscsi_cls_session_printk(KERN_ERR, session,
894 "Could not delete all connections "
895 "for session. Error %d.\n", err);
896
897 transport_unregister_device(&session->dev);
898
899 ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
900 device_del(&session->dev);
901 }
902 EXPORT_SYMBOL_GPL(iscsi_remove_session);
903
iscsi_free_session(struct iscsi_cls_session * session)904 void iscsi_free_session(struct iscsi_cls_session *session)
905 {
906 ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
907 iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
908 put_device(&session->dev);
909 }
910 EXPORT_SYMBOL_GPL(iscsi_free_session);
911
912 /**
913 * iscsi_destroy_session - destroy iscsi session
914 * @session: iscsi_session
915 *
916 * Can be called by a LLD or iscsi_transport. There must not be
917 * any running connections.
918 */
iscsi_destroy_session(struct iscsi_cls_session * session)919 int iscsi_destroy_session(struct iscsi_cls_session *session)
920 {
921 iscsi_remove_session(session);
922 ISCSI_DBG_TRANS_SESSION(session, "Completing session destruction\n");
923 iscsi_free_session(session);
924 return 0;
925 }
926 EXPORT_SYMBOL_GPL(iscsi_destroy_session);
927
928 /**
929 * iscsi_create_conn - create iscsi class connection
930 * @session: iscsi cls session
931 * @dd_size: private driver data size
932 * @cid: connection id
933 *
934 * This can be called from a LLD or iscsi_transport. The connection
935 * is child of the session so cid must be unique for all connections
936 * on the session.
937 *
938 * Since we do not support MCS, cid will normally be zero. In some cases
939 * for software iscsi we could be trying to preallocate a connection struct
940 * in which case there could be two connection structs and cid would be
941 * non-zero.
942 */
943 struct iscsi_cls_conn *
iscsi_create_conn(struct iscsi_cls_session * session,int dd_size,uint32_t cid)944 iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
945 {
946 struct iscsi_transport *transport = session->transport;
947 struct iscsi_cls_conn *conn;
948 unsigned long flags;
949 int err;
950
951 conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
952 if (!conn)
953 return NULL;
954 if (dd_size)
955 conn->dd_data = &conn[1];
956
957 mutex_init(&conn->ep_mutex);
958 INIT_LIST_HEAD(&conn->conn_list);
959 conn->transport = transport;
960 conn->cid = cid;
961
962 /* this is released in the dev's release function */
963 if (!get_device(&session->dev))
964 goto free_conn;
965
966 dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
967 conn->dev.parent = &session->dev;
968 conn->dev.release = iscsi_conn_release;
969 err = device_register(&conn->dev);
970 if (err) {
971 iscsi_cls_session_printk(KERN_ERR, session, "could not "
972 "register connection's dev\n");
973 goto release_parent_ref;
974 }
975 transport_register_device(&conn->dev);
976
977 spin_lock_irqsave(&connlock, flags);
978 list_add(&conn->conn_list, &connlist);
979 spin_unlock_irqrestore(&connlock, flags);
980
981 ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
982 return conn;
983
984 release_parent_ref:
985 put_device(&session->dev);
986 free_conn:
987 kfree(conn);
988 return NULL;
989 }
990
991 EXPORT_SYMBOL_GPL(iscsi_create_conn);
992
993 /**
994 * iscsi_destroy_conn - destroy iscsi class connection
995 * @conn: iscsi cls session
996 *
997 * This can be called from a LLD or iscsi_transport.
998 */
iscsi_destroy_conn(struct iscsi_cls_conn * conn)999 int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
1000 {
1001 unsigned long flags;
1002
1003 spin_lock_irqsave(&connlock, flags);
1004 list_del(&conn->conn_list);
1005 spin_unlock_irqrestore(&connlock, flags);
1006
1007 transport_unregister_device(&conn->dev);
1008 ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n");
1009 device_unregister(&conn->dev);
1010 return 0;
1011 }
1012 EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
1013
1014 /*
1015 * iscsi interface functions
1016 */
1017 static struct iscsi_internal *
iscsi_if_transport_lookup(struct iscsi_transport * tt)1018 iscsi_if_transport_lookup(struct iscsi_transport *tt)
1019 {
1020 struct iscsi_internal *priv;
1021 unsigned long flags;
1022
1023 spin_lock_irqsave(&iscsi_transport_lock, flags);
1024 list_for_each_entry(priv, &iscsi_transports, list) {
1025 if (tt == priv->iscsi_transport) {
1026 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1027 return priv;
1028 }
1029 }
1030 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1031 return NULL;
1032 }
1033
1034 static int
iscsi_multicast_skb(struct sk_buff * skb,uint32_t group,gfp_t gfp)1035 iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
1036 {
1037 return nlmsg_multicast(nls, skb, 0, group, gfp);
1038 }
1039
iscsi_recv_pdu(struct iscsi_cls_conn * conn,struct iscsi_hdr * hdr,char * data,uint32_t data_size)1040 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
1041 char *data, uint32_t data_size)
1042 {
1043 struct nlmsghdr *nlh;
1044 struct sk_buff *skb;
1045 struct iscsi_uevent *ev;
1046 char *pdu;
1047 struct iscsi_internal *priv;
1048 int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) +
1049 data_size);
1050
1051 priv = iscsi_if_transport_lookup(conn->transport);
1052 if (!priv)
1053 return -EINVAL;
1054
1055 skb = alloc_skb(len, GFP_ATOMIC);
1056 if (!skb) {
1057 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
1058 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
1059 "control PDU: OOM\n");
1060 return -ENOMEM;
1061 }
1062
1063 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1064 ev = NLMSG_DATA(nlh);
1065 memset(ev, 0, sizeof(*ev));
1066 ev->transport_handle = iscsi_handle(conn->transport);
1067 ev->type = ISCSI_KEVENT_RECV_PDU;
1068 ev->r.recv_req.cid = conn->cid;
1069 ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
1070 pdu = (char*)ev + sizeof(*ev);
1071 memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
1072 memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
1073
1074 return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1075 }
1076 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
1077
iscsi_offload_mesg(struct Scsi_Host * shost,struct iscsi_transport * transport,uint32_t type,char * data,uint16_t data_size)1078 int iscsi_offload_mesg(struct Scsi_Host *shost,
1079 struct iscsi_transport *transport, uint32_t type,
1080 char *data, uint16_t data_size)
1081 {
1082 struct nlmsghdr *nlh;
1083 struct sk_buff *skb;
1084 struct iscsi_uevent *ev;
1085 int len = NLMSG_SPACE(sizeof(*ev) + data_size);
1086
1087 skb = alloc_skb(len, GFP_ATOMIC);
1088 if (!skb) {
1089 printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
1090 return -ENOMEM;
1091 }
1092
1093 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1094 ev = NLMSG_DATA(nlh);
1095 memset(ev, 0, sizeof(*ev));
1096 ev->type = type;
1097 ev->transport_handle = iscsi_handle(transport);
1098 switch (type) {
1099 case ISCSI_KEVENT_PATH_REQ:
1100 ev->r.req_path.host_no = shost->host_no;
1101 break;
1102 case ISCSI_KEVENT_IF_DOWN:
1103 ev->r.notify_if_down.host_no = shost->host_no;
1104 break;
1105 }
1106
1107 memcpy((char *)ev + sizeof(*ev), data, data_size);
1108
1109 return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
1110 }
1111 EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
1112
iscsi_conn_error_event(struct iscsi_cls_conn * conn,enum iscsi_err error)1113 void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
1114 {
1115 struct nlmsghdr *nlh;
1116 struct sk_buff *skb;
1117 struct iscsi_uevent *ev;
1118 struct iscsi_internal *priv;
1119 int len = NLMSG_SPACE(sizeof(*ev));
1120
1121 priv = iscsi_if_transport_lookup(conn->transport);
1122 if (!priv)
1123 return;
1124
1125 skb = alloc_skb(len, GFP_ATOMIC);
1126 if (!skb) {
1127 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
1128 "conn error (%d)\n", error);
1129 return;
1130 }
1131
1132 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1133 ev = NLMSG_DATA(nlh);
1134 ev->transport_handle = iscsi_handle(conn->transport);
1135 ev->type = ISCSI_KEVENT_CONN_ERROR;
1136 ev->r.connerror.error = error;
1137 ev->r.connerror.cid = conn->cid;
1138 ev->r.connerror.sid = iscsi_conn_get_sid(conn);
1139
1140 iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1141
1142 iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
1143 error);
1144 }
1145 EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
1146
1147 static int
iscsi_if_send_reply(uint32_t group,int seq,int type,int done,int multi,void * payload,int size)1148 iscsi_if_send_reply(uint32_t group, int seq, int type, int done, int multi,
1149 void *payload, int size)
1150 {
1151 struct sk_buff *skb;
1152 struct nlmsghdr *nlh;
1153 int len = NLMSG_SPACE(size);
1154 int flags = multi ? NLM_F_MULTI : 0;
1155 int t = done ? NLMSG_DONE : type;
1156
1157 skb = alloc_skb(len, GFP_ATOMIC);
1158 if (!skb) {
1159 printk(KERN_ERR "Could not allocate skb to send reply.\n");
1160 return -ENOMEM;
1161 }
1162
1163 nlh = __nlmsg_put(skb, 0, 0, t, (len - sizeof(*nlh)), 0);
1164 nlh->nlmsg_flags = flags;
1165 memcpy(NLMSG_DATA(nlh), payload, size);
1166 return iscsi_multicast_skb(skb, group, GFP_ATOMIC);
1167 }
1168
1169 static int
iscsi_if_get_stats(struct iscsi_transport * transport,struct nlmsghdr * nlh)1170 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
1171 {
1172 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1173 struct iscsi_stats *stats;
1174 struct sk_buff *skbstat;
1175 struct iscsi_cls_conn *conn;
1176 struct nlmsghdr *nlhstat;
1177 struct iscsi_uevent *evstat;
1178 struct iscsi_internal *priv;
1179 int len = NLMSG_SPACE(sizeof(*ev) +
1180 sizeof(struct iscsi_stats) +
1181 sizeof(struct iscsi_stats_custom) *
1182 ISCSI_STATS_CUSTOM_MAX);
1183 int err = 0;
1184
1185 priv = iscsi_if_transport_lookup(transport);
1186 if (!priv)
1187 return -EINVAL;
1188
1189 conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
1190 if (!conn)
1191 return -EEXIST;
1192
1193 do {
1194 int actual_size;
1195
1196 skbstat = alloc_skb(len, GFP_ATOMIC);
1197 if (!skbstat) {
1198 iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
1199 "deliver stats: OOM\n");
1200 return -ENOMEM;
1201 }
1202
1203 nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
1204 (len - sizeof(*nlhstat)), 0);
1205 evstat = NLMSG_DATA(nlhstat);
1206 memset(evstat, 0, sizeof(*evstat));
1207 evstat->transport_handle = iscsi_handle(conn->transport);
1208 evstat->type = nlh->nlmsg_type;
1209 evstat->u.get_stats.cid =
1210 ev->u.get_stats.cid;
1211 evstat->u.get_stats.sid =
1212 ev->u.get_stats.sid;
1213 stats = (struct iscsi_stats *)
1214 ((char*)evstat + sizeof(*evstat));
1215 memset(stats, 0, sizeof(*stats));
1216
1217 transport->get_stats(conn, stats);
1218 actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) +
1219 sizeof(struct iscsi_stats) +
1220 sizeof(struct iscsi_stats_custom) *
1221 stats->custom_length);
1222 actual_size -= sizeof(*nlhstat);
1223 actual_size = NLMSG_LENGTH(actual_size);
1224 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
1225 nlhstat->nlmsg_len = actual_size;
1226
1227 err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
1228 GFP_ATOMIC);
1229 } while (err < 0 && err != -ECONNREFUSED);
1230
1231 return err;
1232 }
1233
1234 /**
1235 * iscsi_session_event - send session destr. completion event
1236 * @session: iscsi class session
1237 * @event: type of event
1238 */
iscsi_session_event(struct iscsi_cls_session * session,enum iscsi_uevent_e event)1239 int iscsi_session_event(struct iscsi_cls_session *session,
1240 enum iscsi_uevent_e event)
1241 {
1242 struct iscsi_internal *priv;
1243 struct Scsi_Host *shost;
1244 struct iscsi_uevent *ev;
1245 struct sk_buff *skb;
1246 struct nlmsghdr *nlh;
1247 int rc, len = NLMSG_SPACE(sizeof(*ev));
1248
1249 priv = iscsi_if_transport_lookup(session->transport);
1250 if (!priv)
1251 return -EINVAL;
1252 shost = iscsi_session_to_shost(session);
1253
1254 skb = alloc_skb(len, GFP_KERNEL);
1255 if (!skb) {
1256 iscsi_cls_session_printk(KERN_ERR, session,
1257 "Cannot notify userspace of session "
1258 "event %u\n", event);
1259 return -ENOMEM;
1260 }
1261
1262 nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1263 ev = NLMSG_DATA(nlh);
1264 ev->transport_handle = iscsi_handle(session->transport);
1265
1266 ev->type = event;
1267 switch (event) {
1268 case ISCSI_KEVENT_DESTROY_SESSION:
1269 ev->r.d_session.host_no = shost->host_no;
1270 ev->r.d_session.sid = session->sid;
1271 break;
1272 case ISCSI_KEVENT_CREATE_SESSION:
1273 ev->r.c_session_ret.host_no = shost->host_no;
1274 ev->r.c_session_ret.sid = session->sid;
1275 break;
1276 case ISCSI_KEVENT_UNBIND_SESSION:
1277 ev->r.unbind_session.host_no = shost->host_no;
1278 ev->r.unbind_session.sid = session->sid;
1279 break;
1280 default:
1281 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
1282 "%u.\n", event);
1283 kfree_skb(skb);
1284 return -EINVAL;
1285 }
1286
1287 /*
1288 * this will occur if the daemon is not up, so we just warn
1289 * the user and when the daemon is restarted it will handle it
1290 */
1291 rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
1292 if (rc == -ESRCH)
1293 iscsi_cls_session_printk(KERN_ERR, session,
1294 "Cannot notify userspace of session "
1295 "event %u. Check iscsi daemon\n",
1296 event);
1297
1298 ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
1299 event, rc);
1300 return rc;
1301 }
1302 EXPORT_SYMBOL_GPL(iscsi_session_event);
1303
1304 static int
iscsi_if_create_session(struct iscsi_internal * priv,struct iscsi_endpoint * ep,struct iscsi_uevent * ev,uint32_t initial_cmdsn,uint16_t cmds_max,uint16_t queue_depth)1305 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
1306 struct iscsi_uevent *ev, uint32_t initial_cmdsn,
1307 uint16_t cmds_max, uint16_t queue_depth)
1308 {
1309 struct iscsi_transport *transport = priv->iscsi_transport;
1310 struct iscsi_cls_session *session;
1311 struct Scsi_Host *shost;
1312
1313 session = transport->create_session(ep, cmds_max, queue_depth,
1314 initial_cmdsn);
1315 if (!session)
1316 return -ENOMEM;
1317
1318 shost = iscsi_session_to_shost(session);
1319 ev->r.c_session_ret.host_no = shost->host_no;
1320 ev->r.c_session_ret.sid = session->sid;
1321 ISCSI_DBG_TRANS_SESSION(session,
1322 "Completed creating transport session\n");
1323 return 0;
1324 }
1325
1326 static int
iscsi_if_create_conn(struct iscsi_transport * transport,struct iscsi_uevent * ev)1327 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1328 {
1329 struct iscsi_cls_conn *conn;
1330 struct iscsi_cls_session *session;
1331
1332 session = iscsi_session_lookup(ev->u.c_conn.sid);
1333 if (!session) {
1334 printk(KERN_ERR "iscsi: invalid session %d.\n",
1335 ev->u.c_conn.sid);
1336 return -EINVAL;
1337 }
1338
1339 conn = transport->create_conn(session, ev->u.c_conn.cid);
1340 if (!conn) {
1341 iscsi_cls_session_printk(KERN_ERR, session,
1342 "couldn't create a new connection.");
1343 return -ENOMEM;
1344 }
1345
1346 ev->r.c_conn_ret.sid = session->sid;
1347 ev->r.c_conn_ret.cid = conn->cid;
1348
1349 ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
1350 return 0;
1351 }
1352
1353 static int
iscsi_if_destroy_conn(struct iscsi_transport * transport,struct iscsi_uevent * ev)1354 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1355 {
1356 struct iscsi_cls_conn *conn;
1357
1358 conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
1359 if (!conn)
1360 return -EINVAL;
1361
1362 ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
1363 if (transport->destroy_conn)
1364 transport->destroy_conn(conn);
1365
1366 return 0;
1367 }
1368
1369 static int
iscsi_set_param(struct iscsi_transport * transport,struct iscsi_uevent * ev)1370 iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1371 {
1372 char *data = (char*)ev + sizeof(*ev);
1373 struct iscsi_cls_conn *conn;
1374 struct iscsi_cls_session *session;
1375 int err = 0, value = 0;
1376
1377 session = iscsi_session_lookup(ev->u.set_param.sid);
1378 conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
1379 if (!conn || !session)
1380 return -EINVAL;
1381
1382 switch (ev->u.set_param.param) {
1383 case ISCSI_PARAM_SESS_RECOVERY_TMO:
1384 sscanf(data, "%d", &value);
1385 session->recovery_tmo = value;
1386 break;
1387 default:
1388 err = transport->set_param(conn, ev->u.set_param.param,
1389 data, ev->u.set_param.len);
1390 }
1391
1392 return err;
1393 }
1394
iscsi_if_ep_connect(struct iscsi_transport * transport,struct iscsi_uevent * ev,int msg_type)1395 static int iscsi_if_ep_connect(struct iscsi_transport *transport,
1396 struct iscsi_uevent *ev, int msg_type)
1397 {
1398 struct iscsi_endpoint *ep;
1399 struct sockaddr *dst_addr;
1400 struct Scsi_Host *shost = NULL;
1401 int non_blocking, err = 0;
1402
1403 if (!transport->ep_connect)
1404 return -EINVAL;
1405
1406 if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
1407 shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
1408 if (!shost) {
1409 printk(KERN_ERR "ep connect failed. Could not find "
1410 "host no %u\n",
1411 ev->u.ep_connect_through_host.host_no);
1412 return -ENODEV;
1413 }
1414 non_blocking = ev->u.ep_connect_through_host.non_blocking;
1415 } else
1416 non_blocking = ev->u.ep_connect.non_blocking;
1417
1418 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1419 ep = transport->ep_connect(shost, dst_addr, non_blocking);
1420 if (IS_ERR(ep)) {
1421 err = PTR_ERR(ep);
1422 goto release_host;
1423 }
1424
1425 ev->r.ep_connect_ret.handle = ep->id;
1426 release_host:
1427 if (shost)
1428 scsi_host_put(shost);
1429 return err;
1430 }
1431
iscsi_if_ep_disconnect(struct iscsi_transport * transport,u64 ep_handle)1432 static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
1433 u64 ep_handle)
1434 {
1435 struct iscsi_cls_conn *conn;
1436 struct iscsi_endpoint *ep;
1437
1438 if (!transport->ep_disconnect)
1439 return -EINVAL;
1440
1441 ep = iscsi_lookup_endpoint(ep_handle);
1442 if (!ep)
1443 return -EINVAL;
1444 conn = ep->conn;
1445 if (conn) {
1446 mutex_lock(&conn->ep_mutex);
1447 conn->ep = NULL;
1448 mutex_unlock(&conn->ep_mutex);
1449 }
1450
1451 transport->ep_disconnect(ep);
1452 return 0;
1453 }
1454
1455 static int
iscsi_if_transport_ep(struct iscsi_transport * transport,struct iscsi_uevent * ev,int msg_type)1456 iscsi_if_transport_ep(struct iscsi_transport *transport,
1457 struct iscsi_uevent *ev, int msg_type)
1458 {
1459 struct iscsi_endpoint *ep;
1460 int rc = 0;
1461
1462 switch (msg_type) {
1463 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
1464 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1465 rc = iscsi_if_ep_connect(transport, ev, msg_type);
1466 break;
1467 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1468 if (!transport->ep_poll)
1469 return -EINVAL;
1470
1471 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
1472 if (!ep)
1473 return -EINVAL;
1474
1475 ev->r.retcode = transport->ep_poll(ep,
1476 ev->u.ep_poll.timeout_ms);
1477 break;
1478 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1479 rc = iscsi_if_ep_disconnect(transport,
1480 ev->u.ep_disconnect.ep_handle);
1481 break;
1482 }
1483 return rc;
1484 }
1485
1486 static int
iscsi_tgt_dscvr(struct iscsi_transport * transport,struct iscsi_uevent * ev)1487 iscsi_tgt_dscvr(struct iscsi_transport *transport,
1488 struct iscsi_uevent *ev)
1489 {
1490 struct Scsi_Host *shost;
1491 struct sockaddr *dst_addr;
1492 int err;
1493
1494 if (!transport->tgt_dscvr)
1495 return -EINVAL;
1496
1497 shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
1498 if (!shost) {
1499 printk(KERN_ERR "target discovery could not find host no %u\n",
1500 ev->u.tgt_dscvr.host_no);
1501 return -ENODEV;
1502 }
1503
1504
1505 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1506 err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
1507 ev->u.tgt_dscvr.enable, dst_addr);
1508 scsi_host_put(shost);
1509 return err;
1510 }
1511
1512 static int
iscsi_set_host_param(struct iscsi_transport * transport,struct iscsi_uevent * ev)1513 iscsi_set_host_param(struct iscsi_transport *transport,
1514 struct iscsi_uevent *ev)
1515 {
1516 char *data = (char*)ev + sizeof(*ev);
1517 struct Scsi_Host *shost;
1518 int err;
1519
1520 if (!transport->set_host_param)
1521 return -ENOSYS;
1522
1523 shost = scsi_host_lookup(ev->u.set_host_param.host_no);
1524 if (!shost) {
1525 printk(KERN_ERR "set_host_param could not find host no %u\n",
1526 ev->u.set_host_param.host_no);
1527 return -ENODEV;
1528 }
1529
1530 err = transport->set_host_param(shost, ev->u.set_host_param.param,
1531 data, ev->u.set_host_param.len);
1532 scsi_host_put(shost);
1533 return err;
1534 }
1535
1536 static int
iscsi_set_path(struct iscsi_transport * transport,struct iscsi_uevent * ev)1537 iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1538 {
1539 struct Scsi_Host *shost;
1540 struct iscsi_path *params;
1541 int err;
1542
1543 if (!transport->set_path)
1544 return -ENOSYS;
1545
1546 shost = scsi_host_lookup(ev->u.set_path.host_no);
1547 if (!shost) {
1548 printk(KERN_ERR "set path could not find host no %u\n",
1549 ev->u.set_path.host_no);
1550 return -ENODEV;
1551 }
1552
1553 params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
1554 err = transport->set_path(shost, params);
1555
1556 scsi_host_put(shost);
1557 return err;
1558 }
1559
1560 static int
iscsi_if_recv_msg(struct sk_buff * skb,struct nlmsghdr * nlh,uint32_t * group)1561 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
1562 {
1563 int err = 0;
1564 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1565 struct iscsi_transport *transport = NULL;
1566 struct iscsi_internal *priv;
1567 struct iscsi_cls_session *session;
1568 struct iscsi_cls_conn *conn;
1569 struct iscsi_endpoint *ep = NULL;
1570
1571 if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
1572 *group = ISCSI_NL_GRP_UIP;
1573 else
1574 *group = ISCSI_NL_GRP_ISCSID;
1575
1576 priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
1577 if (!priv)
1578 return -EINVAL;
1579 transport = priv->iscsi_transport;
1580
1581 if (!try_module_get(transport->owner))
1582 return -EINVAL;
1583
1584 switch (nlh->nlmsg_type) {
1585 case ISCSI_UEVENT_CREATE_SESSION:
1586 err = iscsi_if_create_session(priv, ep, ev,
1587 ev->u.c_session.initial_cmdsn,
1588 ev->u.c_session.cmds_max,
1589 ev->u.c_session.queue_depth);
1590 break;
1591 case ISCSI_UEVENT_CREATE_BOUND_SESSION:
1592 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
1593 if (!ep) {
1594 err = -EINVAL;
1595 break;
1596 }
1597
1598 err = iscsi_if_create_session(priv, ep, ev,
1599 ev->u.c_bound_session.initial_cmdsn,
1600 ev->u.c_bound_session.cmds_max,
1601 ev->u.c_bound_session.queue_depth);
1602 break;
1603 case ISCSI_UEVENT_DESTROY_SESSION:
1604 session = iscsi_session_lookup(ev->u.d_session.sid);
1605 if (session)
1606 transport->destroy_session(session);
1607 else
1608 err = -EINVAL;
1609 break;
1610 case ISCSI_UEVENT_UNBIND_SESSION:
1611 session = iscsi_session_lookup(ev->u.d_session.sid);
1612 if (session)
1613 scsi_queue_work(iscsi_session_to_shost(session),
1614 &session->unbind_work);
1615 else
1616 err = -EINVAL;
1617 break;
1618 case ISCSI_UEVENT_CREATE_CONN:
1619 err = iscsi_if_create_conn(transport, ev);
1620 break;
1621 case ISCSI_UEVENT_DESTROY_CONN:
1622 err = iscsi_if_destroy_conn(transport, ev);
1623 break;
1624 case ISCSI_UEVENT_BIND_CONN:
1625 session = iscsi_session_lookup(ev->u.b_conn.sid);
1626 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
1627
1628 if (conn && conn->ep)
1629 iscsi_if_ep_disconnect(transport, conn->ep->id);
1630
1631 if (!session || !conn) {
1632 err = -EINVAL;
1633 break;
1634 }
1635
1636 ev->r.retcode = transport->bind_conn(session, conn,
1637 ev->u.b_conn.transport_eph,
1638 ev->u.b_conn.is_leading);
1639 if (ev->r.retcode || !transport->ep_connect)
1640 break;
1641
1642 ep = iscsi_lookup_endpoint(ev->u.b_conn.transport_eph);
1643 if (ep) {
1644 ep->conn = conn;
1645
1646 mutex_lock(&conn->ep_mutex);
1647 conn->ep = ep;
1648 mutex_unlock(&conn->ep_mutex);
1649 } else
1650 iscsi_cls_conn_printk(KERN_ERR, conn,
1651 "Could not set ep conn "
1652 "binding\n");
1653 break;
1654 case ISCSI_UEVENT_SET_PARAM:
1655 err = iscsi_set_param(transport, ev);
1656 break;
1657 case ISCSI_UEVENT_START_CONN:
1658 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
1659 if (conn)
1660 ev->r.retcode = transport->start_conn(conn);
1661 else
1662 err = -EINVAL;
1663 break;
1664 case ISCSI_UEVENT_STOP_CONN:
1665 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
1666 if (conn)
1667 transport->stop_conn(conn, ev->u.stop_conn.flag);
1668 else
1669 err = -EINVAL;
1670 break;
1671 case ISCSI_UEVENT_SEND_PDU:
1672 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
1673 if (conn)
1674 ev->r.retcode = transport->send_pdu(conn,
1675 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
1676 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
1677 ev->u.send_pdu.data_size);
1678 else
1679 err = -EINVAL;
1680 break;
1681 case ISCSI_UEVENT_GET_STATS:
1682 err = iscsi_if_get_stats(transport, nlh);
1683 break;
1684 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1685 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1686 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1687 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
1688 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
1689 break;
1690 case ISCSI_UEVENT_TGT_DSCVR:
1691 err = iscsi_tgt_dscvr(transport, ev);
1692 break;
1693 case ISCSI_UEVENT_SET_HOST_PARAM:
1694 err = iscsi_set_host_param(transport, ev);
1695 break;
1696 case ISCSI_UEVENT_PATH_UPDATE:
1697 err = iscsi_set_path(transport, ev);
1698 break;
1699 default:
1700 err = -ENOSYS;
1701 break;
1702 }
1703
1704 module_put(transport->owner);
1705 return err;
1706 }
1707
1708 /*
1709 * Get message from skb. Each message is processed by iscsi_if_recv_msg.
1710 * Malformed skbs with wrong lengths or invalid creds are not processed.
1711 */
1712 static void
iscsi_if_rx(struct sk_buff * skb)1713 iscsi_if_rx(struct sk_buff *skb)
1714 {
1715 mutex_lock(&rx_queue_mutex);
1716 while (skb->len >= NLMSG_SPACE(0)) {
1717 int err;
1718 uint32_t rlen;
1719 struct nlmsghdr *nlh;
1720 struct iscsi_uevent *ev;
1721 uint32_t group;
1722
1723 nlh = nlmsg_hdr(skb);
1724 if (nlh->nlmsg_len < sizeof(*nlh) ||
1725 skb->len < nlh->nlmsg_len) {
1726 break;
1727 }
1728
1729 ev = NLMSG_DATA(nlh);
1730 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
1731 if (rlen > skb->len)
1732 rlen = skb->len;
1733
1734 err = iscsi_if_recv_msg(skb, nlh, &group);
1735 if (err) {
1736 ev->type = ISCSI_KEVENT_IF_ERROR;
1737 ev->iferror = err;
1738 }
1739 do {
1740 /*
1741 * special case for GET_STATS:
1742 * on success - sending reply and stats from
1743 * inside of if_recv_msg(),
1744 * on error - fall through.
1745 */
1746 if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
1747 break;
1748 err = iscsi_if_send_reply(group, nlh->nlmsg_seq,
1749 nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
1750 } while (err < 0 && err != -ECONNREFUSED);
1751 skb_pull(skb, rlen);
1752 }
1753 mutex_unlock(&rx_queue_mutex);
1754 }
1755
1756 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \
1757 struct device_attribute dev_attr_##_prefix##_##_name = \
1758 __ATTR(_name,_mode,_show,_store)
1759
1760 /*
1761 * iSCSI connection attrs
1762 */
1763 #define iscsi_conn_attr_show(param) \
1764 static ssize_t \
1765 show_conn_param_##param(struct device *dev, \
1766 struct device_attribute *attr, char *buf) \
1767 { \
1768 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \
1769 struct iscsi_transport *t = conn->transport; \
1770 return t->get_conn_param(conn, param, buf); \
1771 }
1772
1773 #define iscsi_conn_attr(field, param) \
1774 iscsi_conn_attr_show(param) \
1775 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param, \
1776 NULL);
1777
1778 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
1779 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
1780 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
1781 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
1782 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
1783 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
1784 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
1785 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
1786 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
1787 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
1788 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
1789
1790 #define iscsi_conn_ep_attr_show(param) \
1791 static ssize_t show_conn_ep_param_##param(struct device *dev, \
1792 struct device_attribute *attr,\
1793 char *buf) \
1794 { \
1795 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \
1796 struct iscsi_transport *t = conn->transport; \
1797 struct iscsi_endpoint *ep; \
1798 ssize_t rc; \
1799 \
1800 /* \
1801 * Need to make sure ep_disconnect does not free the LLD's \
1802 * interconnect resources while we are trying to read them. \
1803 */ \
1804 mutex_lock(&conn->ep_mutex); \
1805 ep = conn->ep; \
1806 if (!ep && t->ep_connect) { \
1807 mutex_unlock(&conn->ep_mutex); \
1808 return -ENOTCONN; \
1809 } \
1810 \
1811 if (ep) \
1812 rc = t->get_ep_param(ep, param, buf); \
1813 else \
1814 rc = t->get_conn_param(conn, param, buf); \
1815 mutex_unlock(&conn->ep_mutex); \
1816 return rc; \
1817 }
1818
1819 #define iscsi_conn_ep_attr(field, param) \
1820 iscsi_conn_ep_attr_show(param) \
1821 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, \
1822 show_conn_ep_param_##param, NULL);
1823
1824 iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
1825 iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
1826
1827 /*
1828 * iSCSI session attrs
1829 */
1830 #define iscsi_session_attr_show(param, perm) \
1831 static ssize_t \
1832 show_session_param_##param(struct device *dev, \
1833 struct device_attribute *attr, char *buf) \
1834 { \
1835 struct iscsi_cls_session *session = \
1836 iscsi_dev_to_session(dev->parent); \
1837 struct iscsi_transport *t = session->transport; \
1838 \
1839 if (perm && !capable(CAP_SYS_ADMIN)) \
1840 return -EACCES; \
1841 return t->get_session_param(session, param, buf); \
1842 }
1843
1844 #define iscsi_session_attr(field, param, perm) \
1845 iscsi_session_attr_show(param, perm) \
1846 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
1847 NULL);
1848
1849 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
1850 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
1851 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
1852 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
1853 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
1854 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
1855 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
1856 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
1857 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
1858 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
1859 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
1860 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
1861 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
1862 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
1863 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
1864 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
1865 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
1866 iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
1867 iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
1868 iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
1869 iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
1870
1871 static ssize_t
show_priv_session_state(struct device * dev,struct device_attribute * attr,char * buf)1872 show_priv_session_state(struct device *dev, struct device_attribute *attr,
1873 char *buf)
1874 {
1875 struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
1876 return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
1877 }
1878 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
1879 NULL);
1880
1881 #define iscsi_priv_session_attr_show(field, format) \
1882 static ssize_t \
1883 show_priv_session_##field(struct device *dev, \
1884 struct device_attribute *attr, char *buf) \
1885 { \
1886 struct iscsi_cls_session *session = \
1887 iscsi_dev_to_session(dev->parent); \
1888 if (session->field == -1) \
1889 return sprintf(buf, "off\n"); \
1890 return sprintf(buf, format"\n", session->field); \
1891 }
1892
1893 #define iscsi_priv_session_attr_store(field) \
1894 static ssize_t \
1895 store_priv_session_##field(struct device *dev, \
1896 struct device_attribute *attr, \
1897 const char *buf, size_t count) \
1898 { \
1899 int val; \
1900 char *cp; \
1901 struct iscsi_cls_session *session = \
1902 iscsi_dev_to_session(dev->parent); \
1903 if ((session->state == ISCSI_SESSION_FREE) || \
1904 (session->state == ISCSI_SESSION_FAILED)) \
1905 return -EBUSY; \
1906 if (strncmp(buf, "off", 3) == 0) \
1907 session->field = -1; \
1908 else { \
1909 val = simple_strtoul(buf, &cp, 0); \
1910 if (*cp != '\0' && *cp != '\n') \
1911 return -EINVAL; \
1912 session->field = val; \
1913 } \
1914 return count; \
1915 }
1916
1917 #define iscsi_priv_session_rw_attr(field, format) \
1918 iscsi_priv_session_attr_show(field, format) \
1919 iscsi_priv_session_attr_store(field) \
1920 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUSR, \
1921 show_priv_session_##field, \
1922 store_priv_session_##field)
1923 iscsi_priv_session_rw_attr(recovery_tmo, "%d");
1924
1925 /*
1926 * iSCSI host attrs
1927 */
1928 #define iscsi_host_attr_show(param) \
1929 static ssize_t \
1930 show_host_param_##param(struct device *dev, \
1931 struct device_attribute *attr, char *buf) \
1932 { \
1933 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1934 struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
1935 return priv->iscsi_transport->get_host_param(shost, param, buf); \
1936 }
1937
1938 #define iscsi_host_attr(field, param) \
1939 iscsi_host_attr_show(param) \
1940 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param, \
1941 NULL);
1942
1943 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
1944 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
1945 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
1946 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
1947
1948 #define SETUP_PRIV_SESSION_RD_ATTR(field) \
1949 do { \
1950 priv->session_attrs[count] = &dev_attr_priv_sess_##field; \
1951 count++; \
1952 } while (0)
1953
1954 #define SETUP_PRIV_SESSION_RW_ATTR(field) \
1955 do { \
1956 priv->session_attrs[count] = &dev_attr_priv_sess_##field; \
1957 count++; \
1958 } while (0)
1959
1960 #define SETUP_SESSION_RD_ATTR(field, param_flag) \
1961 do { \
1962 if (tt->param_mask & param_flag) { \
1963 priv->session_attrs[count] = &dev_attr_sess_##field; \
1964 count++; \
1965 } \
1966 } while (0)
1967
1968 #define SETUP_CONN_RD_ATTR(field, param_flag) \
1969 do { \
1970 if (tt->param_mask & param_flag) { \
1971 priv->conn_attrs[count] = &dev_attr_conn_##field; \
1972 count++; \
1973 } \
1974 } while (0)
1975
1976 #define SETUP_HOST_RD_ATTR(field, param_flag) \
1977 do { \
1978 if (tt->host_param_mask & param_flag) { \
1979 priv->host_attrs[count] = &dev_attr_host_##field; \
1980 count++; \
1981 } \
1982 } while (0)
1983
iscsi_session_match(struct attribute_container * cont,struct device * dev)1984 static int iscsi_session_match(struct attribute_container *cont,
1985 struct device *dev)
1986 {
1987 struct iscsi_cls_session *session;
1988 struct Scsi_Host *shost;
1989 struct iscsi_internal *priv;
1990
1991 if (!iscsi_is_session_dev(dev))
1992 return 0;
1993
1994 session = iscsi_dev_to_session(dev);
1995 shost = iscsi_session_to_shost(session);
1996 if (!shost->transportt)
1997 return 0;
1998
1999 priv = to_iscsi_internal(shost->transportt);
2000 if (priv->session_cont.ac.class != &iscsi_session_class.class)
2001 return 0;
2002
2003 return &priv->session_cont.ac == cont;
2004 }
2005
iscsi_conn_match(struct attribute_container * cont,struct device * dev)2006 static int iscsi_conn_match(struct attribute_container *cont,
2007 struct device *dev)
2008 {
2009 struct iscsi_cls_session *session;
2010 struct iscsi_cls_conn *conn;
2011 struct Scsi_Host *shost;
2012 struct iscsi_internal *priv;
2013
2014 if (!iscsi_is_conn_dev(dev))
2015 return 0;
2016
2017 conn = iscsi_dev_to_conn(dev);
2018 session = iscsi_dev_to_session(conn->dev.parent);
2019 shost = iscsi_session_to_shost(session);
2020
2021 if (!shost->transportt)
2022 return 0;
2023
2024 priv = to_iscsi_internal(shost->transportt);
2025 if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
2026 return 0;
2027
2028 return &priv->conn_cont.ac == cont;
2029 }
2030
iscsi_host_match(struct attribute_container * cont,struct device * dev)2031 static int iscsi_host_match(struct attribute_container *cont,
2032 struct device *dev)
2033 {
2034 struct Scsi_Host *shost;
2035 struct iscsi_internal *priv;
2036
2037 if (!scsi_is_host_device(dev))
2038 return 0;
2039
2040 shost = dev_to_shost(dev);
2041 if (!shost->transportt ||
2042 shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
2043 return 0;
2044
2045 priv = to_iscsi_internal(shost->transportt);
2046 return &priv->t.host_attrs.ac == cont;
2047 }
2048
2049 struct scsi_transport_template *
iscsi_register_transport(struct iscsi_transport * tt)2050 iscsi_register_transport(struct iscsi_transport *tt)
2051 {
2052 struct iscsi_internal *priv;
2053 unsigned long flags;
2054 int count = 0, err;
2055
2056 BUG_ON(!tt);
2057
2058 priv = iscsi_if_transport_lookup(tt);
2059 if (priv)
2060 return NULL;
2061
2062 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2063 if (!priv)
2064 return NULL;
2065 INIT_LIST_HEAD(&priv->list);
2066 priv->iscsi_transport = tt;
2067 priv->t.user_scan = iscsi_user_scan;
2068 priv->t.create_work_queue = 1;
2069
2070 priv->dev.class = &iscsi_transport_class;
2071 dev_set_name(&priv->dev, "%s", tt->name);
2072 err = device_register(&priv->dev);
2073 if (err)
2074 goto free_priv;
2075
2076 err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
2077 if (err)
2078 goto unregister_dev;
2079
2080 /* host parameters */
2081 priv->t.host_attrs.ac.attrs = &priv->host_attrs[0];
2082 priv->t.host_attrs.ac.class = &iscsi_host_class.class;
2083 priv->t.host_attrs.ac.match = iscsi_host_match;
2084 priv->t.host_size = sizeof(struct iscsi_cls_host);
2085 transport_container_register(&priv->t.host_attrs);
2086
2087 SETUP_HOST_RD_ATTR(netdev, ISCSI_HOST_NETDEV_NAME);
2088 SETUP_HOST_RD_ATTR(ipaddress, ISCSI_HOST_IPADDRESS);
2089 SETUP_HOST_RD_ATTR(hwaddress, ISCSI_HOST_HWADDRESS);
2090 SETUP_HOST_RD_ATTR(initiatorname, ISCSI_HOST_INITIATOR_NAME);
2091 BUG_ON(count > ISCSI_HOST_ATTRS);
2092 priv->host_attrs[count] = NULL;
2093 count = 0;
2094
2095 /* connection parameters */
2096 priv->conn_cont.ac.attrs = &priv->conn_attrs[0];
2097 priv->conn_cont.ac.class = &iscsi_connection_class.class;
2098 priv->conn_cont.ac.match = iscsi_conn_match;
2099 transport_container_register(&priv->conn_cont);
2100
2101 SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_MAX_RECV_DLENGTH);
2102 SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_MAX_XMIT_DLENGTH);
2103 SETUP_CONN_RD_ATTR(header_digest, ISCSI_HDRDGST_EN);
2104 SETUP_CONN_RD_ATTR(data_digest, ISCSI_DATADGST_EN);
2105 SETUP_CONN_RD_ATTR(ifmarker, ISCSI_IFMARKER_EN);
2106 SETUP_CONN_RD_ATTR(ofmarker, ISCSI_OFMARKER_EN);
2107 SETUP_CONN_RD_ATTR(address, ISCSI_CONN_ADDRESS);
2108 SETUP_CONN_RD_ATTR(port, ISCSI_CONN_PORT);
2109 SETUP_CONN_RD_ATTR(exp_statsn, ISCSI_EXP_STATSN);
2110 SETUP_CONN_RD_ATTR(persistent_address, ISCSI_PERSISTENT_ADDRESS);
2111 SETUP_CONN_RD_ATTR(persistent_port, ISCSI_PERSISTENT_PORT);
2112 SETUP_CONN_RD_ATTR(ping_tmo, ISCSI_PING_TMO);
2113 SETUP_CONN_RD_ATTR(recv_tmo, ISCSI_RECV_TMO);
2114
2115 BUG_ON(count > ISCSI_CONN_ATTRS);
2116 priv->conn_attrs[count] = NULL;
2117 count = 0;
2118
2119 /* session parameters */
2120 priv->session_cont.ac.attrs = &priv->session_attrs[0];
2121 priv->session_cont.ac.class = &iscsi_session_class.class;
2122 priv->session_cont.ac.match = iscsi_session_match;
2123 transport_container_register(&priv->session_cont);
2124
2125 SETUP_SESSION_RD_ATTR(initial_r2t, ISCSI_INITIAL_R2T_EN);
2126 SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_MAX_R2T);
2127 SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_IMM_DATA_EN);
2128 SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_FIRST_BURST);
2129 SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_MAX_BURST);
2130 SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PDU_INORDER_EN);
2131 SETUP_SESSION_RD_ATTR(data_seq_in_order, ISCSI_DATASEQ_INORDER_EN);
2132 SETUP_SESSION_RD_ATTR(erl, ISCSI_ERL);
2133 SETUP_SESSION_RD_ATTR(targetname, ISCSI_TARGET_NAME);
2134 SETUP_SESSION_RD_ATTR(tpgt, ISCSI_TPGT);
2135 SETUP_SESSION_RD_ATTR(password, ISCSI_USERNAME);
2136 SETUP_SESSION_RD_ATTR(password_in, ISCSI_USERNAME_IN);
2137 SETUP_SESSION_RD_ATTR(username, ISCSI_PASSWORD);
2138 SETUP_SESSION_RD_ATTR(username_in, ISCSI_PASSWORD_IN);
2139 SETUP_SESSION_RD_ATTR(fast_abort, ISCSI_FAST_ABORT);
2140 SETUP_SESSION_RD_ATTR(abort_tmo, ISCSI_ABORT_TMO);
2141 SETUP_SESSION_RD_ATTR(lu_reset_tmo,ISCSI_LU_RESET_TMO);
2142 SETUP_SESSION_RD_ATTR(tgt_reset_tmo,ISCSI_TGT_RESET_TMO);
2143 SETUP_SESSION_RD_ATTR(ifacename, ISCSI_IFACE_NAME);
2144 SETUP_SESSION_RD_ATTR(initiatorname, ISCSI_INITIATOR_NAME);
2145 SETUP_SESSION_RD_ATTR(targetalias, ISCSI_TARGET_ALIAS);
2146 SETUP_PRIV_SESSION_RW_ATTR(recovery_tmo);
2147 SETUP_PRIV_SESSION_RD_ATTR(state);
2148
2149 BUG_ON(count > ISCSI_SESSION_ATTRS);
2150 priv->session_attrs[count] = NULL;
2151
2152 spin_lock_irqsave(&iscsi_transport_lock, flags);
2153 list_add(&priv->list, &iscsi_transports);
2154 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2155
2156 printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
2157 return &priv->t;
2158
2159 unregister_dev:
2160 device_unregister(&priv->dev);
2161 return NULL;
2162 free_priv:
2163 kfree(priv);
2164 return NULL;
2165 }
2166 EXPORT_SYMBOL_GPL(iscsi_register_transport);
2167
iscsi_unregister_transport(struct iscsi_transport * tt)2168 int iscsi_unregister_transport(struct iscsi_transport *tt)
2169 {
2170 struct iscsi_internal *priv;
2171 unsigned long flags;
2172
2173 BUG_ON(!tt);
2174
2175 mutex_lock(&rx_queue_mutex);
2176
2177 priv = iscsi_if_transport_lookup(tt);
2178 BUG_ON (!priv);
2179
2180 spin_lock_irqsave(&iscsi_transport_lock, flags);
2181 list_del(&priv->list);
2182 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2183
2184 transport_container_unregister(&priv->conn_cont);
2185 transport_container_unregister(&priv->session_cont);
2186 transport_container_unregister(&priv->t.host_attrs);
2187
2188 sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
2189 device_unregister(&priv->dev);
2190 mutex_unlock(&rx_queue_mutex);
2191
2192 return 0;
2193 }
2194 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
2195
iscsi_transport_init(void)2196 static __init int iscsi_transport_init(void)
2197 {
2198 int err;
2199
2200 printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
2201 ISCSI_TRANSPORT_VERSION);
2202
2203 atomic_set(&iscsi_session_nr, 0);
2204
2205 err = class_register(&iscsi_transport_class);
2206 if (err)
2207 return err;
2208
2209 err = class_register(&iscsi_endpoint_class);
2210 if (err)
2211 goto unregister_transport_class;
2212
2213 err = transport_class_register(&iscsi_host_class);
2214 if (err)
2215 goto unregister_endpoint_class;
2216
2217 err = transport_class_register(&iscsi_connection_class);
2218 if (err)
2219 goto unregister_host_class;
2220
2221 err = transport_class_register(&iscsi_session_class);
2222 if (err)
2223 goto unregister_conn_class;
2224
2225 nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, 1, iscsi_if_rx,
2226 NULL, THIS_MODULE);
2227 if (!nls) {
2228 err = -ENOBUFS;
2229 goto unregister_session_class;
2230 }
2231
2232 iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
2233 if (!iscsi_eh_timer_workq)
2234 goto release_nls;
2235
2236 return 0;
2237
2238 release_nls:
2239 netlink_kernel_release(nls);
2240 unregister_session_class:
2241 transport_class_unregister(&iscsi_session_class);
2242 unregister_conn_class:
2243 transport_class_unregister(&iscsi_connection_class);
2244 unregister_host_class:
2245 transport_class_unregister(&iscsi_host_class);
2246 unregister_endpoint_class:
2247 class_unregister(&iscsi_endpoint_class);
2248 unregister_transport_class:
2249 class_unregister(&iscsi_transport_class);
2250 return err;
2251 }
2252
iscsi_transport_exit(void)2253 static void __exit iscsi_transport_exit(void)
2254 {
2255 destroy_workqueue(iscsi_eh_timer_workq);
2256 netlink_kernel_release(nls);
2257 transport_class_unregister(&iscsi_connection_class);
2258 transport_class_unregister(&iscsi_session_class);
2259 transport_class_unregister(&iscsi_host_class);
2260 class_unregister(&iscsi_endpoint_class);
2261 class_unregister(&iscsi_transport_class);
2262 }
2263
2264 module_init(iscsi_transport_init);
2265 module_exit(iscsi_transport_exit);
2266
2267 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
2268 "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
2269 "Alex Aizman <itn780@yahoo.com>");
2270 MODULE_DESCRIPTION("iSCSI Transport Interface");
2271 MODULE_LICENSE("GPL");
2272 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
2273 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);
2274