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[SCSI] ibmvscsi: Add support for capabilities MAD
[deliverable/linux.git] / drivers / scsi / scsi_transport_iscsi.c
CommitLineData
0896b752 1/*
1da177e4
LT		 2 * iSCSI transport class definitions
3 *
4 * Copyright (C) IBM Corporation, 2004
0896b752
AA		 5 * Copyright (C) Mike Christie, 2004 - 2005
6 * Copyright (C) Dmitry Yusupov, 2004 - 2005
7 * Copyright (C) Alex Aizman, 2004 - 2005
1da177e4
LT		 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>
0b950672 24#include <linux/mutex.h>
0896b752 25#include <net/tcp.h>
1da177e4
LT		 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>
0896b752 31#include <scsi/iscsi_if.h>
1da177e4 32
88dfd340 33#define ISCSI_SESSION_ATTRS 21
c238c3bb 34#define ISCSI_CONN_ATTRS 13
d8196ed2 35#define ISCSI_HOST_ATTRS 4
d82ff9be 36
4c2133c8 37#define ISCSI_TRANSPORT_VERSION "2.0-870"
1da177e4
LT		 38
39struct iscsi_internal {
790f39a2 40 int daemon_pid;
1da177e4 41 struct scsi_transport_template t;
0896b752
AA		 42 struct iscsi_transport *iscsi_transport;
43 struct list_head list;
ee959b00 44 struct device dev;
30a6c652 45
ee959b00 46 struct device_attribute *host_attrs[ISCSI_HOST_ATTRS + 1];
0896b752 47 struct transport_container conn_cont;
ee959b00 48 struct device_attribute *conn_attrs[ISCSI_CONN_ATTRS + 1];
0896b752 49 struct transport_container session_cont;
ee959b00 50 struct device_attribute *session_attrs[ISCSI_SESSION_ATTRS + 1];
1da177e4
LT		 51};
52
41be1444 53static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
d8bf541e 54static struct workqueue_struct *iscsi_eh_timer_workq;
b5c7a12d 55
0896b752
AA		 56/*
57 * list of registered transports and lock that must
58 * be held while accessing list. The iscsi_transport_lock must
0b950672 59 * be acquired after the rx_queue_mutex.
0896b752
AA		 60 */
61static LIST_HEAD(iscsi_transports);
62static DEFINE_SPINLOCK(iscsi_transport_lock);
63
64#define to_iscsi_internal(tmpl) \
65 container_of(tmpl, struct iscsi_internal, t)
66
ee959b00
TJ		 67#define dev_to_iscsi_internal(_dev) \
68 container_of(_dev, struct iscsi_internal, dev)
0896b752 69
ee959b00 70static void iscsi_transport_release(struct device *dev)
0896b752 71{
ee959b00 72 struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
0896b752
AA		 73 kfree(priv);
74}
1da177e4 75
0896b752
AA		 76/*
77 * iscsi_transport_class represents the iscsi_transports that are
78 * registered.
79 */
80static struct class iscsi_transport_class = {
81 .name = "iscsi_transport",
ee959b00 82 .dev_release = iscsi_transport_release,
0896b752
AA		 83};
84
85static ssize_t
ee959b00
TJ		 86show_transport_handle(struct device *dev, struct device_attribute *attr,
87 char *buf)
0896b752 88{
ee959b00 89 struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
762e2bfa 90 return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport));
0896b752 91}
ee959b00 92static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
0896b752
AA		 93
94#define show_transport_attr(name, format) \
95static ssize_t \
ee959b00
TJ		 96show_transport_##name(struct device *dev, \
97 struct device_attribute *attr,char *buf) \
0896b752 98{ \
ee959b00 99 struct iscsi_internal *priv = dev_to_iscsi_internal(dev); \
0896b752
AA		 100 return sprintf(buf, format"\n", priv->iscsi_transport->name); \
101} \
ee959b00 102static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
0896b752
AA		 103
104show_transport_attr(caps, "0x%x");
0896b752
AA		 105
106static struct attribute *iscsi_transport_attrs[] = {
ee959b00
TJ		 107 &dev_attr_handle.attr,
108 &dev_attr_caps.attr,
0896b752
AA		 109 NULL,
110};
111
112static struct attribute_group iscsi_transport_group = {
113 .attrs = iscsi_transport_attrs,
114};
115
d82ff9be
MC		 116/*
117 * iSCSI endpoint attrs
118 */
119#define iscsi_dev_to_endpoint(_dev) \
120 container_of(_dev, struct iscsi_endpoint, dev)
121
122#define ISCSI_ATTR(_prefix,_name,_mode,_show,_store) \
123struct device_attribute dev_attr_##_prefix##_##_name = \
124 __ATTR(_name,_mode,_show,_store)
125
126static void iscsi_endpoint_release(struct device *dev)
127{
128 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
129 kfree(ep);
130}
131
132static struct class iscsi_endpoint_class = {
133 .name = "iscsi_endpoint",
134 .dev_release = iscsi_endpoint_release,
135};
136
137static ssize_t
138show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
139{
140 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
21536062 141 return sprintf(buf, "%llu\n", (unsigned long long) ep->id);
d82ff9be
MC		 142}
143static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
144
145static struct attribute *iscsi_endpoint_attrs[] = {
146 &dev_attr_ep_handle.attr,
147 NULL,
148};
149
150static struct attribute_group iscsi_endpoint_group = {
151 .attrs = iscsi_endpoint_attrs,
152};
153
154#define ISCSI_MAX_EPID -1
155
156static int iscsi_match_epid(struct device *dev, void *data)
157{
158 struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
21536062 159 uint64_t *epid = (uint64_t *) data;
d82ff9be
MC		 160
161 return *epid == ep->id;
162}
163
164struct iscsi_endpoint *
165iscsi_create_endpoint(int dd_size)
166{
167 struct device *dev;
168 struct iscsi_endpoint *ep;
21536062 169 uint64_t id;
d82ff9be
MC		 170 int err;
171
172 for (id = 1; id < ISCSI_MAX_EPID; id++) {
695794ae 173 dev = class_find_device(&iscsi_endpoint_class, NULL, &id,
d82ff9be
MC		 174 iscsi_match_epid);
175 if (!dev)
176 break;
177 }
178 if (id == ISCSI_MAX_EPID) {
179 printk(KERN_ERR "Too many connections. Max supported %u\n",
180 ISCSI_MAX_EPID - 1);
181 return NULL;
182 }
183
184 ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL);
185 if (!ep)
186 return NULL;
187
188 ep->id = id;
189 ep->dev.class = &iscsi_endpoint_class;
71610f55 190 dev_set_name(&ep->dev, "ep-%llu", (unsigned long long) id);
d82ff9be
MC		 191 err = device_register(&ep->dev);
192 if (err)
193 goto free_ep;
194
195 err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group);
196 if (err)
197 goto unregister_dev;
198
199 if (dd_size)
200 ep->dd_data = &ep[1];
201 return ep;
202
203unregister_dev:
204 device_unregister(&ep->dev);
205 return NULL;
206
207free_ep:
208 kfree(ep);
209 return NULL;
210}
211EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
212
213void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
214{
215 sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
216 device_unregister(&ep->dev);
217}
218EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
219
220struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
221{
f80f868e 222 struct iscsi_endpoint *ep;
d82ff9be
MC		 223 struct device *dev;
224
695794ae 225 dev = class_find_device(&iscsi_endpoint_class, NULL, &handle,
d82ff9be
MC		 226 iscsi_match_epid);
227 if (!dev)
228 return NULL;
229
f80f868e
MC		 230 ep = iscsi_dev_to_endpoint(dev);
231 /*
232 * we can drop this now because the interface will prevent
233 * removals and lookups from racing.
234 */
235 put_device(dev);
236 return ep;
d82ff9be
MC		 237}
238EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
239
30a6c652 240static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
ee959b00 241 struct device *cdev)
30a6c652
MC		 242{
243 struct Scsi_Host *shost = dev_to_shost(dev);
32c6e1b9 244 struct iscsi_cls_host *ihost = shost->shost_data;
30a6c652
MC		 245
246 memset(ihost, 0, sizeof(*ihost));
8aae18ad 247 atomic_set(&ihost->nr_scans, 0);
7970634b 248 mutex_init(&ihost->mutex);
30a6c652
MC		 249 return 0;
250}
251
252static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
253 "iscsi_host",
254 iscsi_setup_host,
06d25af4 255 NULL,
30a6c652
MC		 256 NULL);
257
0896b752
AA		 258static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
259 "iscsi_session",
1da177e4
LT		 260 NULL,
261 NULL,
262 NULL);
263
0896b752
AA		 264static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
265 "iscsi_connection",
1da177e4
LT		 266 NULL,
267 NULL,
268 NULL);
0896b752
AA		 269
270static struct sock *nls;
0b950672 271static DEFINE_MUTEX(rx_queue_mutex);
0896b752 272
7b7232f3
MC		 273static LIST_HEAD(sesslist);
274static DEFINE_SPINLOCK(sesslock);
7b8631b5
MC		 275static LIST_HEAD(connlist);
276static DEFINE_SPINLOCK(connlock);
0896b752 277
b5c7a12d
MC		 278static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
279{
280 struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
281 return sess->sid;
282}
283
284/*
285 * Returns the matching session to a given sid
286 */
287static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
7b7232f3
MC		 288{
289 unsigned long flags;
290 struct iscsi_cls_session *sess;
291
292 spin_lock_irqsave(&sesslock, flags);
293 list_for_each_entry(sess, &sesslist, sess_list) {
b5c7a12d 294 if (sess->sid == sid) {
7b7232f3
MC		 295 spin_unlock_irqrestore(&sesslock, flags);
296 return sess;
297 }
298 }
299 spin_unlock_irqrestore(&sesslock, flags);
300 return NULL;
301}
302
b5c7a12d
MC		 303/*
304 * Returns the matching connection to a given sid / cid tuple
305 */
306static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
7b7232f3
MC		 307{
308 unsigned long flags;
309 struct iscsi_cls_conn *conn;
310
311 spin_lock_irqsave(&connlock, flags);
312 list_for_each_entry(conn, &connlist, conn_list) {
b5c7a12d 313 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
7b7232f3
MC		 314 spin_unlock_irqrestore(&connlock, flags);
315 return conn;
316 }
317 }
318 spin_unlock_irqrestore(&connlock, flags);
319 return NULL;
320}
321
7b8631b5
MC		 322/*
323 * The following functions can be used by LLDs that allocate
324 * their own scsi_hosts or by software iscsi LLDs
325 */
6eabafbe
MC		 326static struct {
327 int value;
328 char *name;
329} iscsi_session_state_names[] = {
330 { ISCSI_SESSION_LOGGED_IN, "LOGGED_IN" },
331 { ISCSI_SESSION_FAILED, "FAILED" },
332 { ISCSI_SESSION_FREE, "FREE" },
333};
334
3b0f208a 335static const char *iscsi_session_state_name(int state)
6eabafbe
MC		 336{
337 int i;
338 char *name = NULL;
339
340 for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
341 if (iscsi_session_state_names[i].value == state) {
342 name = iscsi_session_state_names[i].name;
343 break;
344 }
345 }
346 return name;
347}
348
349int iscsi_session_chkready(struct iscsi_cls_session *session)
350{
351 unsigned long flags;
352 int err;
353
354 spin_lock_irqsave(&session->lock, flags);
355 switch (session->state) {
356 case ISCSI_SESSION_LOGGED_IN:
357 err = 0;
358 break;
359 case ISCSI_SESSION_FAILED:
9a1a69a1 360 err = DID_IMM_RETRY << 16;
6eabafbe
MC		 361 break;
362 case ISCSI_SESSION_FREE:
56d7fcfa 363 err = DID_TRANSPORT_FAILFAST << 16;
6eabafbe
MC		 364 break;
365 default:
366 err = DID_NO_CONNECT << 16;
367 break;
368 }
369 spin_unlock_irqrestore(&session->lock, flags);
370 return err;
371}
372EXPORT_SYMBOL_GPL(iscsi_session_chkready);
373
7b8631b5
MC		 374static void iscsi_session_release(struct device *dev)
375{
376 struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
7b8631b5 377 struct Scsi_Host *shost;
0896b752 378
7b8631b5
MC		 379 shost = iscsi_session_to_shost(session);
380 scsi_host_put(shost);
381 kfree(session);
7b8631b5 382}
0896b752 383
7b8631b5
MC		 384static int iscsi_is_session_dev(const struct device *dev)
385{
386 return dev->release == iscsi_session_release;
387}
0896b752 388
a4804cd6
MC		 389static int iscsi_iter_session_fn(struct device *dev, void *data)
390{
391 void (* fn) (struct iscsi_cls_session *) = data;
392
393 if (!iscsi_is_session_dev(dev))
394 return 0;
395 fn(iscsi_dev_to_session(dev));
396 return 0;
397}
398
399void iscsi_host_for_each_session(struct Scsi_Host *shost,
400 void (*fn)(struct iscsi_cls_session *))
401{
402 device_for_each_child(&shost->shost_gendev, fn,
403 iscsi_iter_session_fn);
404}
405EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
406
8aae18ad
MC		 407/**
408 * iscsi_scan_finished - helper to report when running scans are done
409 * @shost: scsi host
410 * @time: scan run time
411 *
412 * This function can be used by drives like qla4xxx to report to the scsi
413 * layer when the scans it kicked off at module load time are done.
414 */
415int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
416{
32c6e1b9 417 struct iscsi_cls_host *ihost = shost->shost_data;
8aae18ad
MC		 418 /*
419 * qla4xxx will have kicked off some session unblocks before calling
420 * scsi_scan_host, so just wait for them to complete.
421 */
422 return !atomic_read(&ihost->nr_scans);
423}
424EXPORT_SYMBOL_GPL(iscsi_scan_finished);
425
7970634b
MC		 426struct iscsi_scan_data {
427 unsigned int channel;
428 unsigned int id;
429 unsigned int lun;
430};
431
432static int iscsi_user_scan_session(struct device *dev, void *data)
30a6c652 433{
7970634b 434 struct iscsi_scan_data *scan_data = data;
30a6c652 435 struct iscsi_cls_session *session;
7970634b
MC		 436 struct Scsi_Host *shost;
437 struct iscsi_cls_host *ihost;
438 unsigned long flags;
439 unsigned int id;
440
441 if (!iscsi_is_session_dev(dev))
442 return 0;
443
444 session = iscsi_dev_to_session(dev);
445 shost = iscsi_session_to_shost(session);
446 ihost = shost->shost_data;
30a6c652
MC		 447
448 mutex_lock(&ihost->mutex);
7970634b
MC		 449 spin_lock_irqsave(&session->lock, flags);
450 if (session->state != ISCSI_SESSION_LOGGED_IN) {
451 spin_unlock_irqrestore(&session->lock, flags);
452 mutex_unlock(&ihost->mutex);
453 return 0;
30a6c652 454 }
7970634b
MC		 455 id = session->target_id;
456 spin_unlock_irqrestore(&session->lock, flags);
30a6c652 457
7970634b
MC		 458 if (id != ISCSI_MAX_TARGET) {
459 if ((scan_data->channel == SCAN_WILD_CARD ||
460 scan_data->channel == 0) &&
461 (scan_data->id == SCAN_WILD_CARD ||
462 scan_data->id == id))
463 scsi_scan_target(&session->dev, 0, id,
464 scan_data->lun, 1);
465 }
466 mutex_unlock(&ihost->mutex);
30a6c652
MC		 467 return 0;
468}
469
7970634b
MC		 470static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
471 uint id, uint lun)
472{
473 struct iscsi_scan_data scan_data;
474
475 scan_data.channel = channel;
476 scan_data.id = id;
477 scan_data.lun = lun;
478
479 return device_for_each_child(&shost->shost_gendev, &scan_data,
480 iscsi_user_scan_session);
481}
482
bd976f62
MC		 483static void iscsi_scan_session(struct work_struct *work)
484{
485 struct iscsi_cls_session *session =
486 container_of(work, struct iscsi_cls_session, scan_work);
8aae18ad 487 struct Scsi_Host *shost = iscsi_session_to_shost(session);
32c6e1b9 488 struct iscsi_cls_host *ihost = shost->shost_data;
7970634b 489 struct iscsi_scan_data scan_data;
bd976f62 490
7970634b
MC		 491 scan_data.channel = 0;
492 scan_data.id = SCAN_WILD_CARD;
493 scan_data.lun = SCAN_WILD_CARD;
bd976f62 494
7970634b 495 iscsi_user_scan_session(&session->dev, &scan_data);
8aae18ad 496 atomic_dec(&ihost->nr_scans);
bd976f62
MC		 497}
498
c4028958 499static void session_recovery_timedout(struct work_struct *work)
30a6c652 500{
c4028958
DH		 501 struct iscsi_cls_session *session =
502 container_of(work, struct iscsi_cls_session,
503 recovery_work.work);
6eabafbe 504 unsigned long flags;
30a6c652 505
322d739d
MC		 506 iscsi_cls_session_printk(KERN_INFO, session,
507 "session recovery timed out after %d secs\n",
508 session->recovery_tmo);
30a6c652 509
6eabafbe
MC		 510 spin_lock_irqsave(&session->lock, flags);
511 switch (session->state) {
512 case ISCSI_SESSION_FAILED:
513 session->state = ISCSI_SESSION_FREE;
514 break;
515 case ISCSI_SESSION_LOGGED_IN:
516 case ISCSI_SESSION_FREE:
517 /* we raced with the unblock's flush */
518 spin_unlock_irqrestore(&session->lock, flags);
519 return;
520 }
521 spin_unlock_irqrestore(&session->lock, flags);
522
30a6c652
MC		 523 if (session->transport->session_recovery_timedout)
524 session->transport->session_recovery_timedout(session);
525
526 scsi_target_unblock(&session->dev);
527}
528
45ab33b6 529static void __iscsi_unblock_session(struct work_struct *work)
6eabafbe 530{
45ab33b6
MC		 531 struct iscsi_cls_session *session =
532 container_of(work, struct iscsi_cls_session,
533 unblock_work);
bd976f62 534 struct Scsi_Host *shost = iscsi_session_to_shost(session);
32c6e1b9 535 struct iscsi_cls_host *ihost = shost->shost_data;
6eabafbe
MC		 536 unsigned long flags;
537
45ab33b6
MC		 538 /*
539 * The recovery and unblock work get run from the same workqueue,
540 * so try to cancel it if it was going to run after this unblock.
541 */
542 cancel_delayed_work(&session->recovery_work);
6eabafbe
MC		 543 spin_lock_irqsave(&session->lock, flags);
544 session->state = ISCSI_SESSION_LOGGED_IN;
545 spin_unlock_irqrestore(&session->lock, flags);
45ab33b6
MC		 546 /* start IO */
547 scsi_target_unblock(&session->dev);
8aae18ad
MC		 548 /*
549 * Only do kernel scanning if the driver is properly hooked into
550 * the async scanning code (drivers like iscsi_tcp do login and
551 * scanning from userspace).
552 */
553 if (shost->hostt->scan_finished) {
06d25af4 554 if (scsi_queue_work(shost, &session->scan_work))
8aae18ad
MC		 555 atomic_inc(&ihost->nr_scans);
556 }
6eabafbe 557}
45ab33b6
MC		 558
559/**
560 * iscsi_unblock_session - set a session as logged in and start IO.
561 * @session: iscsi session
562 *
563 * Mark a session as ready to accept IO.
564 */
565void iscsi_unblock_session(struct iscsi_cls_session *session)
566{
567 queue_work(iscsi_eh_timer_workq, &session->unblock_work);
568 /*
569 * make sure all the events have completed before tell the driver
570 * it is safe
571 */
572 flush_workqueue(iscsi_eh_timer_workq);
573}
30a6c652
MC		 574EXPORT_SYMBOL_GPL(iscsi_unblock_session);
575
45ab33b6 576static void __iscsi_block_session(struct work_struct *work)
30a6c652 577{
45ab33b6
MC		 578 struct iscsi_cls_session *session =
579 container_of(work, struct iscsi_cls_session,
580 block_work);
6eabafbe
MC		 581 unsigned long flags;
582
583 spin_lock_irqsave(&session->lock, flags);
584 session->state = ISCSI_SESSION_FAILED;
585 spin_unlock_irqrestore(&session->lock, flags);
30a6c652 586 scsi_target_block(&session->dev);
d8bf541e
MC		 587 queue_delayed_work(iscsi_eh_timer_workq, &session->recovery_work,
588 session->recovery_tmo * HZ);
30a6c652 589}
45ab33b6
MC		 590
591void iscsi_block_session(struct iscsi_cls_session *session)
592{
593 queue_work(iscsi_eh_timer_workq, &session->block_work);
594}
30a6c652
MC		 595EXPORT_SYMBOL_GPL(iscsi_block_session);
596
26974789
MC		 597static void __iscsi_unbind_session(struct work_struct *work)
598{
599 struct iscsi_cls_session *session =
600 container_of(work, struct iscsi_cls_session,
601 unbind_work);
602 struct Scsi_Host *shost = iscsi_session_to_shost(session);
32c6e1b9 603 struct iscsi_cls_host *ihost = shost->shost_data;
7970634b 604 unsigned long flags;
26974789
MC		 605
606 /* Prevent new scans and make sure scanning is not in progress */
607 mutex_lock(&ihost->mutex);
7970634b
MC		 608 spin_lock_irqsave(&session->lock, flags);
609 if (session->target_id == ISCSI_MAX_TARGET) {
610 spin_unlock_irqrestore(&session->lock, flags);
26974789
MC		 611 mutex_unlock(&ihost->mutex);
612 return;
613 }
7970634b
MC		 614 session->target_id = ISCSI_MAX_TARGET;
615 spin_unlock_irqrestore(&session->lock, flags);
26974789
MC		 616 mutex_unlock(&ihost->mutex);
617
618 scsi_remove_target(&session->dev);
619 iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
620}
621
7b8631b5 622struct iscsi_cls_session *
5d91e209
MC		 623iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
624 int dd_size)
7b8631b5
MC		 625{
626 struct iscsi_cls_session *session;
7b8631b5 627
5d91e209 628 session = kzalloc(sizeof(*session) + dd_size,
b5c7a12d 629 GFP_KERNEL);
7b8631b5 630 if (!session)
f53a88da
MC		 631 return NULL;
632
7b8631b5 633 session->transport = transport;
30a6c652 634 session->recovery_tmo = 120;
6eabafbe 635 session->state = ISCSI_SESSION_FREE;
c4028958 636 INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
30a6c652 637 INIT_LIST_HEAD(&session->sess_list);
45ab33b6
MC		 638 INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
639 INIT_WORK(&session->block_work, __iscsi_block_session);
26974789 640 INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
bd976f62 641 INIT_WORK(&session->scan_work, iscsi_scan_session);
6eabafbe 642 spin_lock_init(&session->lock);
7b8631b5 643
6a8a0d36
MC		 644 /* this is released in the dev's release function */
645 scsi_host_get(shost);
8434aa8b
MC		 646 session->dev.parent = &shost->shost_gendev;
647 session->dev.release = iscsi_session_release;
648 device_initialize(&session->dev);
5d91e209 649 if (dd_size)
b5c7a12d 650 session->dd_data = &session[1];
8434aa8b
MC		 651 return session;
652}
653EXPORT_SYMBOL_GPL(iscsi_alloc_session);
654
7970634b
MC		 655static int iscsi_get_next_target_id(struct device *dev, void *data)
656{
657 struct iscsi_cls_session *session;
658 unsigned long flags;
659 int err = 0;
660
661 if (!iscsi_is_session_dev(dev))
662 return 0;
663
664 session = iscsi_dev_to_session(dev);
665 spin_lock_irqsave(&session->lock, flags);
666 if (*((unsigned int *) data) == session->target_id)
667 err = -EEXIST;
668 spin_unlock_irqrestore(&session->lock, flags);
669 return err;
670}
671
6a8a0d36 672int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
8434aa8b
MC		 673{
674 struct Scsi_Host *shost = iscsi_session_to_shost(session);
32c6e1b9 675 struct iscsi_cls_host *ihost;
26974789 676 unsigned long flags;
7970634b 677 unsigned int id = target_id;
8434aa8b 678 int err;
b5c7a12d 679
30a6c652 680 ihost = shost->shost_data;
41be1444 681 session->sid = atomic_add_return(1, &iscsi_session_nr);
7970634b
MC		 682
683 if (id == ISCSI_MAX_TARGET) {
684 for (id = 0; id < ISCSI_MAX_TARGET; id++) {
685 err = device_for_each_child(&shost->shost_gendev, &id,
686 iscsi_get_next_target_id);
687 if (!err)
688 break;
689 }
690
691 if (id == ISCSI_MAX_TARGET) {
692 iscsi_cls_session_printk(KERN_ERR, session,
693 "Too many iscsi targets. Max "
694 "number of targets is %d.\n",
695 ISCSI_MAX_TARGET - 1);
696 goto release_host;
697 }
698 }
699 session->target_id = id;
30a6c652 700
71610f55 701 dev_set_name(&session->dev, "session%u", session->sid);
8434aa8b 702 err = device_add(&session->dev);
7b8631b5 703 if (err) {
322d739d
MC		 704 iscsi_cls_session_printk(KERN_ERR, session,
705 "could not register session's dev\n");
8434aa8b 706 goto release_host;
7b8631b5
MC		 707 }
708 transport_register_device(&session->dev);
709
26974789
MC		 710 spin_lock_irqsave(&sesslock, flags);
711 list_add(&session->sess_list, &sesslist);
712 spin_unlock_irqrestore(&sesslock, flags);
713
26974789 714 iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
8434aa8b 715 return 0;
30a6c652 716
8434aa8b
MC		 717release_host:
718 scsi_host_put(shost);
719 return err;
7b8631b5 720}
8434aa8b 721EXPORT_SYMBOL_GPL(iscsi_add_session);
7b8631b5
MC		 722
723/**
8434aa8b
MC		 724 * iscsi_create_session - create iscsi class session
725 * @shost: scsi host
726 * @transport: iscsi transport
5d91e209 727 * @dd_size: private driver data size
eb44820c 728 * @target_id: which target
7b8631b5 729 *
8434aa8b 730 * This can be called from a LLD or iscsi_transport.
eb44820c 731 */
8434aa8b 732struct iscsi_cls_session *
5d91e209
MC		 733iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
734 int dd_size, unsigned int target_id)
8434aa8b
MC		 735{
736 struct iscsi_cls_session *session;
737
5d91e209 738 session = iscsi_alloc_session(shost, transport, dd_size);
8434aa8b
MC		 739 if (!session)
740 return NULL;
741
6a8a0d36 742 if (iscsi_add_session(session, target_id)) {
8434aa8b
MC		 743 iscsi_free_session(session);
744 return NULL;
745 }
746 return session;
747}
748EXPORT_SYMBOL_GPL(iscsi_create_session);
749
26974789
MC		 750static void iscsi_conn_release(struct device *dev)
751{
752 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
753 struct device *parent = conn->dev.parent;
754
755 kfree(conn);
756 put_device(parent);
757}
758
759static int iscsi_is_conn_dev(const struct device *dev)
760{
761 return dev->release == iscsi_conn_release;
762}
763
764static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
765{
766 if (!iscsi_is_conn_dev(dev))
767 return 0;
768 return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
769}
770
8434aa8b 771void iscsi_remove_session(struct iscsi_cls_session *session)
7b8631b5 772{
30a6c652 773 struct Scsi_Host *shost = iscsi_session_to_shost(session);
26974789
MC		 774 unsigned long flags;
775 int err;
776
777 spin_lock_irqsave(&sesslock, flags);
778 list_del(&session->sess_list);
779 spin_unlock_irqrestore(&sesslock, flags);
30a6c652 780
45ab33b6
MC		 781 /* make sure there are no blocks/unblocks queued */
782 flush_workqueue(iscsi_eh_timer_workq);
783 /* make sure the timedout callout is not running */
784 if (!cancel_delayed_work(&session->recovery_work))
785 flush_workqueue(iscsi_eh_timer_workq);
26974789
MC		 786 /*
787 * If we are blocked let commands flow again. The lld or iscsi
788 * layer should set up the queuecommand to fail commands.
45ab33b6
MC		 789 * We assume that LLD will not be calling block/unblock while
790 * removing the session.
26974789 791 */
6eabafbe
MC		 792 spin_lock_irqsave(&session->lock, flags);
793 session->state = ISCSI_SESSION_FREE;
794 spin_unlock_irqrestore(&session->lock, flags);
bd976f62 795
45ab33b6
MC		 796 scsi_target_unblock(&session->dev);
797 /* flush running scans then delete devices */
06d25af4 798 scsi_flush_work(shost);
45ab33b6 799 __iscsi_unbind_session(&session->unbind_work);
30a6c652 800
26974789
MC		 801 /* hw iscsi may not have removed all connections from session */
802 err = device_for_each_child(&session->dev, NULL,
803 iscsi_iter_destroy_conn_fn);
804 if (err)
322d739d
MC		 805 iscsi_cls_session_printk(KERN_ERR, session,
806 "Could not delete all connections "
807 "for session. Error %d.\n", err);
8434aa8b 808
7b8631b5 809 transport_unregister_device(&session->dev);
8434aa8b
MC		 810 device_del(&session->dev);
811}
812EXPORT_SYMBOL_GPL(iscsi_remove_session);
813
814void iscsi_free_session(struct iscsi_cls_session *session)
815{
26974789 816 iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
8434aa8b 817 put_device(&session->dev);
7b8631b5 818}
8434aa8b
MC		 819EXPORT_SYMBOL_GPL(iscsi_free_session);
820
821/**
822 * iscsi_destroy_session - destroy iscsi session
823 * @session: iscsi_session
824 *
825 * Can be called by a LLD or iscsi_transport. There must not be
826 * any running connections.
eb44820c 827 */
8434aa8b
MC		 828int iscsi_destroy_session(struct iscsi_cls_session *session)
829{
830 iscsi_remove_session(session);
831 iscsi_free_session(session);
832 return 0;
833}
7b8631b5
MC		 834EXPORT_SYMBOL_GPL(iscsi_destroy_session);
835
7b8631b5
MC		 836/**
837 * iscsi_create_conn - create iscsi class connection
838 * @session: iscsi cls session
5d91e209 839 * @dd_size: private driver data size
7b8631b5
MC		 840 * @cid: connection id
841 *
842 * This can be called from a LLD or iscsi_transport. The connection
843 * is child of the session so cid must be unique for all connections
844 * on the session.
b5c7a12d
MC		 845 *
846 * Since we do not support MCS, cid will normally be zero. In some cases
847 * for software iscsi we could be trying to preallocate a connection struct
848 * in which case there could be two connection structs and cid would be
849 * non-zero.
eb44820c 850 */
7b8631b5 851struct iscsi_cls_conn *
5d91e209 852iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
7b8631b5
MC		 853{
854 struct iscsi_transport *transport = session->transport;
7b8631b5 855 struct iscsi_cls_conn *conn;
26974789 856 unsigned long flags;
7b8631b5
MC		 857 int err;
858
5d91e209 859 conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
7b8631b5
MC		 860 if (!conn)
861 return NULL;
5d91e209 862 if (dd_size)
7b8631b5
MC		 863 conn->dd_data = &conn[1];
864
865 INIT_LIST_HEAD(&conn->conn_list);
866 conn->transport = transport;
b5c7a12d 867 conn->cid = cid;
7b8631b5
MC		 868
869 /* this is released in the dev's release function */
870 if (!get_device(&session->dev))
43a145a3 871 goto free_conn;
b5c7a12d 872
71610f55 873 dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
7b8631b5
MC		 874 conn->dev.parent = &session->dev;
875 conn->dev.release = iscsi_conn_release;
876 err = device_register(&conn->dev);
877 if (err) {
322d739d
MC		 878 iscsi_cls_session_printk(KERN_ERR, session, "could not "
879 "register connection's dev\n");
7b8631b5
MC		 880 goto release_parent_ref;
881 }
882 transport_register_device(&conn->dev);
26974789
MC		 883
884 spin_lock_irqsave(&connlock, flags);
885 list_add(&conn->conn_list, &connlist);
886 conn->active = 1;
887 spin_unlock_irqrestore(&connlock, flags);
7b8631b5
MC		 888 return conn;
889
890release_parent_ref:
891 put_device(&session->dev);
892free_conn:
893 kfree(conn);
894 return NULL;
895}
896
897EXPORT_SYMBOL_GPL(iscsi_create_conn);
898
899/**
900 * iscsi_destroy_conn - destroy iscsi class connection
eb44820c 901 * @conn: iscsi cls session
7b8631b5 902 *
26974789 903 * This can be called from a LLD or iscsi_transport.
eb44820c 904 */
7b8631b5
MC		 905int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
906{
26974789
MC		 907 unsigned long flags;
908
909 spin_lock_irqsave(&connlock, flags);
910 conn->active = 0;
911 list_del(&conn->conn_list);
912 spin_unlock_irqrestore(&connlock, flags);
913
7b8631b5
MC		 914 transport_unregister_device(&conn->dev);
915 device_unregister(&conn->dev);
916 return 0;
917}
7b8631b5
MC		 918EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
919
7b8631b5
MC		 920/*
921 * iscsi interface functions
922 */
0896b752
AA		 923static struct iscsi_internal *
924iscsi_if_transport_lookup(struct iscsi_transport *tt)
925{
926 struct iscsi_internal *priv;
927 unsigned long flags;
928
929 spin_lock_irqsave(&iscsi_transport_lock, flags);
930 list_for_each_entry(priv, &iscsi_transports, list) {
931 if (tt == priv->iscsi_transport) {
932 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
933 return priv;
934 }
935 }
936 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
937 return NULL;
938}
1da177e4 939
53cb8a1f 940static int
43a145a3 941iscsi_broadcast_skb(struct sk_buff *skb, gfp_t gfp)
53cb8a1f 942{
ff491a73 943 return netlink_broadcast(nls, skb, 0, 1, gfp);
53cb8a1f
MC		 944}
945
0896b752 946static int
43a145a3 947iscsi_unicast_skb(struct sk_buff *skb, int pid)
0896b752 948{
0896b752 949 int rc;
1da177e4 950
790f39a2 951 rc = netlink_unicast(nls, skb, pid, MSG_DONTWAIT);
0896b752 952 if (rc < 0) {
0896b752
AA		 953 printk(KERN_ERR "iscsi: can not unicast skb (%d)\n", rc);
954 return rc;
955 }
956
0896b752 957 return 0;
1da177e4 958}
1da177e4 959
7b7232f3 960int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
0896b752 961 char *data, uint32_t data_size)
1da177e4 962{
0896b752
AA		 963 struct nlmsghdr *nlh;
964 struct sk_buff *skb;
965 struct iscsi_uevent *ev;
0896b752 966 char *pdu;
790f39a2 967 struct iscsi_internal *priv;
0896b752
AA		 968 int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) +
969 data_size);
970
790f39a2
MC		 971 priv = iscsi_if_transport_lookup(conn->transport);
972 if (!priv)
973 return -EINVAL;
974
43a145a3 975 skb = alloc_skb(len, GFP_ATOMIC);
0896b752 976 if (!skb) {
e5bd7b54 977 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
322d739d
MC		 978 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
979 "control PDU: OOM\n");
0896b752
AA		 980 return -ENOMEM;
981 }
1da177e4 982
790f39a2 983 nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
0896b752
AA		 984 ev = NLMSG_DATA(nlh);
985 memset(ev, 0, sizeof(*ev));
986 ev->transport_handle = iscsi_handle(conn->transport);
987 ev->type = ISCSI_KEVENT_RECV_PDU;
b5c7a12d
MC		 988 ev->r.recv_req.cid = conn->cid;
989 ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
0896b752
AA		 990 pdu = (char*)ev + sizeof(*ev);
991 memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
992 memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
1da177e4 993
43a145a3 994 return iscsi_unicast_skb(skb, priv->daemon_pid);
1da177e4 995}
0896b752 996EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
1da177e4 997
e5bd7b54 998void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
1da177e4 999{
0896b752
AA		 1000 struct nlmsghdr *nlh;
1001 struct sk_buff *skb;
1002 struct iscsi_uevent *ev;
790f39a2 1003 struct iscsi_internal *priv;
0896b752
AA		 1004 int len = NLMSG_SPACE(sizeof(*ev));
1005
790f39a2
MC		 1006 priv = iscsi_if_transport_lookup(conn->transport);
1007 if (!priv)
1008 return;
1009
43a145a3 1010 skb = alloc_skb(len, GFP_ATOMIC);
0896b752 1011 if (!skb) {
322d739d
MC		 1012 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
1013 "conn error (%d)\n", error);
0896b752
AA		 1014 return;
1015 }
1016
790f39a2 1017 nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
0896b752
AA		 1018 ev = NLMSG_DATA(nlh);
1019 ev->transport_handle = iscsi_handle(conn->transport);
1020 ev->type = ISCSI_KEVENT_CONN_ERROR;
0896b752 1021 ev->r.connerror.error = error;
b5c7a12d
MC		 1022 ev->r.connerror.cid = conn->cid;
1023 ev->r.connerror.sid = iscsi_conn_get_sid(conn);
1da177e4 1024
43a145a3 1025 iscsi_broadcast_skb(skb, GFP_ATOMIC);
1da177e4 1026
322d739d
MC		 1027 iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
1028 error);
0896b752 1029}
e5bd7b54 1030EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
0896b752
AA		 1031
1032static int
1033iscsi_if_send_reply(int pid, int seq, int type, int done, int multi,
1034 void *payload, int size)
1035{
1036 struct sk_buff *skb;
1037 struct nlmsghdr *nlh;
1038 int len = NLMSG_SPACE(size);
1039 int flags = multi ? NLM_F_MULTI : 0;
1040 int t = done ? NLMSG_DONE : type;
1041
43a145a3 1042 skb = alloc_skb(len, GFP_ATOMIC);
239a7dc2
MC		 1043 if (!skb) {
1044 printk(KERN_ERR "Could not allocate skb to send reply.\n");
1045 return -ENOMEM;
1046 }
0896b752
AA		 1047
1048 nlh = __nlmsg_put(skb, pid, seq, t, (len - sizeof(*nlh)), 0);
1049 nlh->nlmsg_flags = flags;
1050 memcpy(NLMSG_DATA(nlh), payload, size);
43a145a3 1051 return iscsi_unicast_skb(skb, pid);
1da177e4 1052}
1da177e4 1053
7b8631b5 1054static int
5b940adf 1055iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
7b8631b5
MC		 1056{
1057 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1058 struct iscsi_stats *stats;
1059 struct sk_buff *skbstat;
1060 struct iscsi_cls_conn *conn;
1061 struct nlmsghdr *nlhstat;
1062 struct iscsi_uevent *evstat;
790f39a2 1063 struct iscsi_internal *priv;
7b8631b5
MC		 1064 int len = NLMSG_SPACE(sizeof(*ev) +
1065 sizeof(struct iscsi_stats) +
1066 sizeof(struct iscsi_stats_custom) *
1067 ISCSI_STATS_CUSTOM_MAX);
1068 int err = 0;
0896b752 1069
790f39a2
MC		 1070 priv = iscsi_if_transport_lookup(transport);
1071 if (!priv)
1072 return -EINVAL;
1073
b5c7a12d 1074 conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
7b8631b5
MC		 1075 if (!conn)
1076 return -EEXIST;
0896b752 1077
7b8631b5
MC		 1078 do {
1079 int actual_size;
0896b752 1080
43a145a3 1081 skbstat = alloc_skb(len, GFP_ATOMIC);
7b8631b5 1082 if (!skbstat) {
322d739d
MC		 1083 iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
1084 "deliver stats: OOM\n");
7b8631b5
MC		 1085 return -ENOMEM;
1086 }
1087
790f39a2 1088 nlhstat = __nlmsg_put(skbstat, priv->daemon_pid, 0, 0,
7b8631b5
MC		 1089 (len - sizeof(*nlhstat)), 0);
1090 evstat = NLMSG_DATA(nlhstat);
1091 memset(evstat, 0, sizeof(*evstat));
1092 evstat->transport_handle = iscsi_handle(conn->transport);
1093 evstat->type = nlh->nlmsg_type;
b5c7a12d
MC		 1094 evstat->u.get_stats.cid =
1095 ev->u.get_stats.cid;
1096 evstat->u.get_stats.sid =
1097 ev->u.get_stats.sid;
7b8631b5
MC		 1098 stats = (struct iscsi_stats *)
1099 ((char*)evstat + sizeof(*evstat));
1100 memset(stats, 0, sizeof(*stats));
1101
7b7232f3 1102 transport->get_stats(conn, stats);
7b8631b5
MC		 1103 actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) +
1104 sizeof(struct iscsi_stats) +
1105 sizeof(struct iscsi_stats_custom) *
1106 stats->custom_length);
1107 actual_size -= sizeof(*nlhstat);
1108 actual_size = NLMSG_LENGTH(actual_size);
5b940adf 1109 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
7b8631b5
MC		 1110 nlhstat->nlmsg_len = actual_size;
1111
43a145a3 1112 err = iscsi_unicast_skb(skbstat, priv->daemon_pid);
7b8631b5
MC		 1113 } while (err < 0 && err != -ECONNREFUSED);
1114
1115 return err;
0896b752
AA		 1116}
1117
53cb8a1f 1118/**
26974789
MC		 1119 * iscsi_session_event - send session destr. completion event
1120 * @session: iscsi class session
1121 * @event: type of event
eb44820c 1122 */
26974789
MC		 1123int iscsi_session_event(struct iscsi_cls_session *session,
1124 enum iscsi_uevent_e event)
53cb8a1f
MC		 1125{
1126 struct iscsi_internal *priv;
53cb8a1f
MC		 1127 struct Scsi_Host *shost;
1128 struct iscsi_uevent *ev;
1129 struct sk_buff *skb;
1130 struct nlmsghdr *nlh;
53cb8a1f
MC		 1131 int rc, len = NLMSG_SPACE(sizeof(*ev));
1132
26974789 1133 priv = iscsi_if_transport_lookup(session->transport);
53cb8a1f
MC		 1134 if (!priv)
1135 return -EINVAL;
53cb8a1f
MC		 1136 shost = iscsi_session_to_shost(session);
1137
43a145a3 1138 skb = alloc_skb(len, GFP_KERNEL);
53cb8a1f 1139 if (!skb) {
322d739d
MC		 1140 iscsi_cls_session_printk(KERN_ERR, session,
1141 "Cannot notify userspace of session "
1142 "event %u\n", event);
53cb8a1f
MC		 1143 return -ENOMEM;
1144 }
1145
1146 nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
1147 ev = NLMSG_DATA(nlh);
26974789 1148 ev->transport_handle = iscsi_handle(session->transport);
53cb8a1f 1149
26974789
MC		 1150 ev->type = event;
1151 switch (event) {
1152 case ISCSI_KEVENT_DESTROY_SESSION:
1153 ev->r.d_session.host_no = shost->host_no;
1154 ev->r.d_session.sid = session->sid;
1155 break;
1156 case ISCSI_KEVENT_CREATE_SESSION:
1157 ev->r.c_session_ret.host_no = shost->host_no;
1158 ev->r.c_session_ret.sid = session->sid;
1159 break;
1160 case ISCSI_KEVENT_UNBIND_SESSION:
1161 ev->r.unbind_session.host_no = shost->host_no;
1162 ev->r.unbind_session.sid = session->sid;
1163 break;
1164 default:
322d739d
MC		 1165 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
1166 "%u.\n", event);
26974789 1167 kfree_skb(skb);
53cb8a1f 1168 return -EINVAL;
53cb8a1f
MC		 1169 }
1170
53cb8a1f
MC		 1171 /*
1172 * this will occur if the daemon is not up, so we just warn
1173 * the user and when the daemon is restarted it will handle it
1174 */
43a145a3 1175 rc = iscsi_broadcast_skb(skb, GFP_KERNEL);
ff491a73 1176 if (rc == -ESRCH)
322d739d
MC		 1177 iscsi_cls_session_printk(KERN_ERR, session,
1178 "Cannot notify userspace of session "
1179 "event %u. Check iscsi daemon\n",
1180 event);
53cb8a1f
MC		 1181 return rc;
1182}
26974789 1183EXPORT_SYMBOL_GPL(iscsi_session_event);
53cb8a1f 1184
0896b752 1185static int
d82ff9be
MC		 1186iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
1187 struct iscsi_uevent *ev, uint32_t initial_cmdsn,
40753caa 1188 uint16_t cmds_max, uint16_t queue_depth)
0896b752
AA		 1189{
1190 struct iscsi_transport *transport = priv->iscsi_transport;
7b7232f3 1191 struct iscsi_cls_session *session;
5e7facb7 1192 struct Scsi_Host *shost;
0896b752 1193
d82ff9be 1194 session = transport->create_session(ep, cmds_max, queue_depth,
5e7facb7 1195 initial_cmdsn);
7b7232f3 1196 if (!session)
7b8631b5 1197 return -ENOMEM;
0896b752 1198
5e7facb7
MC		 1199 shost = iscsi_session_to_shost(session);
1200 ev->r.c_session_ret.host_no = shost->host_no;
b5c7a12d 1201 ev->r.c_session_ret.sid = session->sid;
0896b752 1202 return 0;
0896b752
AA		 1203}
1204
1205static int
7b7232f3 1206iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
0896b752 1207{
7b8631b5 1208 struct iscsi_cls_conn *conn;
7b7232f3 1209 struct iscsi_cls_session *session;
7b8631b5 1210
b5c7a12d
MC		 1211 session = iscsi_session_lookup(ev->u.c_conn.sid);
1212 if (!session) {
322d739d 1213 printk(KERN_ERR "iscsi: invalid session %d.\n",
b5c7a12d 1214 ev->u.c_conn.sid);
7b8631b5 1215 return -EINVAL;
b5c7a12d 1216 }
0896b752 1217
7b7232f3 1218 conn = transport->create_conn(session, ev->u.c_conn.cid);
b5c7a12d 1219 if (!conn) {
322d739d
MC		 1220 iscsi_cls_session_printk(KERN_ERR, session,
1221 "couldn't create a new connection.");
7b7232f3 1222 return -ENOMEM;
b5c7a12d 1223 }
0896b752 1224
b5c7a12d
MC		 1225 ev->r.c_conn_ret.sid = session->sid;
1226 ev->r.c_conn_ret.cid = conn->cid;
0896b752 1227 return 0;
1da177e4
LT		 1228}
1229
0896b752
AA		 1230static int
1231iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1232{
7b8631b5 1233 struct iscsi_cls_conn *conn;
0896b752 1234
b5c7a12d 1235 conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
0896b752 1236 if (!conn)
7b8631b5 1237 return -EINVAL;
0896b752 1238
7b8631b5
MC		 1239 if (transport->destroy_conn)
1240 transport->destroy_conn(conn);
7b8631b5 1241 return 0;
0896b752
AA		 1242}
1243
fd7255f5
MC		 1244static int
1245iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1246{
1247 char *data = (char*)ev + sizeof(*ev);
1248 struct iscsi_cls_conn *conn;
1249 struct iscsi_cls_session *session;
a54a52ca 1250 int err = 0, value = 0;
fd7255f5
MC		 1251
1252 session = iscsi_session_lookup(ev->u.set_param.sid);
1253 conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
1254 if (!conn || !session)
1255 return -EINVAL;
1256
1257 switch (ev->u.set_param.param) {
30a6c652 1258 case ISCSI_PARAM_SESS_RECOVERY_TMO:
a54a52ca 1259 sscanf(data, "%d", &value);
30a6c652
MC		 1260 if (value != 0)
1261 session->recovery_tmo = value;
1262 break;
fd7255f5 1263 default:
a54a52ca
MC		 1264 err = transport->set_param(conn, ev->u.set_param.param,
1265 data, ev->u.set_param.len);
fd7255f5
MC		 1266 }
1267
1268 return err;
1269}
1270
10eb0f01
MC		 1271static int iscsi_if_ep_connect(struct iscsi_transport *transport,
1272 struct iscsi_uevent *ev, int msg_type)
1273{
1274 struct iscsi_endpoint *ep;
1275 struct sockaddr *dst_addr;
1276 struct Scsi_Host *shost = NULL;
1277 int non_blocking, err = 0;
1278
1279 if (!transport->ep_connect)
1280 return -EINVAL;
1281
1282 if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
1283 shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
1284 if (!shost) {
1285 printk(KERN_ERR "ep connect failed. Could not find "
1286 "host no %u\n",
1287 ev->u.ep_connect_through_host.host_no);
1288 return -ENODEV;
1289 }
1290 non_blocking = ev->u.ep_connect_through_host.non_blocking;
1291 } else
1292 non_blocking = ev->u.ep_connect.non_blocking;
1293
1294 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1295 ep = transport->ep_connect(shost, dst_addr, non_blocking);
1296 if (IS_ERR(ep)) {
1297 err = PTR_ERR(ep);
1298 goto release_host;
1299 }
1300
1301 ev->r.ep_connect_ret.handle = ep->id;
1302release_host:
1303 if (shost)
1304 scsi_host_put(shost);
1305 return err;
1306}
1307
264faaaa
OG		 1308static int
1309iscsi_if_transport_ep(struct iscsi_transport *transport,
1310 struct iscsi_uevent *ev, int msg_type)
1311{
d82ff9be 1312 struct iscsi_endpoint *ep;
264faaaa
OG		 1313 int rc = 0;
1314
1315 switch (msg_type) {
10eb0f01 1316 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
264faaaa 1317 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
10eb0f01 1318 rc = iscsi_if_ep_connect(transport, ev, msg_type);
264faaaa
OG		 1319 break;
1320 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1321 if (!transport->ep_poll)
1322 return -EINVAL;
1323
d82ff9be
MC		 1324 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
1325 if (!ep)
1326 return -EINVAL;
1327
1328 ev->r.retcode = transport->ep_poll(ep,
264faaaa
OG		 1329 ev->u.ep_poll.timeout_ms);
1330 break;
1331 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1332 if (!transport->ep_disconnect)
1333 return -EINVAL;
1334
d82ff9be
MC		 1335 ep = iscsi_lookup_endpoint(ev->u.ep_disconnect.ep_handle);
1336 if (!ep)
1337 return -EINVAL;
1338
1339 transport->ep_disconnect(ep);
264faaaa
OG		 1340 break;
1341 }
1342 return rc;
1343}
1344
01cb225d
MC		 1345static int
1346iscsi_tgt_dscvr(struct iscsi_transport *transport,
1347 struct iscsi_uevent *ev)
1348{
2174a04e 1349 struct Scsi_Host *shost;
01cb225d 1350 struct sockaddr *dst_addr;
2174a04e 1351 int err;
01cb225d
MC		 1352
1353 if (!transport->tgt_dscvr)
1354 return -EINVAL;
1355
2174a04e 1356 shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
315cb0ad 1357 if (!shost) {
2174a04e
MC		 1358 printk(KERN_ERR "target discovery could not find host no %u\n",
1359 ev->u.tgt_dscvr.host_no);
1360 return -ENODEV;
1361 }
1362
1363
01cb225d 1364 dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
2174a04e
MC		 1365 err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
1366 ev->u.tgt_dscvr.enable, dst_addr);
1367 scsi_host_put(shost);
1368 return err;
01cb225d
MC		 1369}
1370
1d9bf13a
MC		 1371static int
1372iscsi_set_host_param(struct iscsi_transport *transport,
1373 struct iscsi_uevent *ev)
1374{
1375 char *data = (char*)ev + sizeof(*ev);
1376 struct Scsi_Host *shost;
1377 int err;
1378
1379 if (!transport->set_host_param)
1380 return -ENOSYS;
1381
1382 shost = scsi_host_lookup(ev->u.set_host_param.host_no);
315cb0ad 1383 if (!shost) {
1d9bf13a
MC		 1384 printk(KERN_ERR "set_host_param could not find host no %u\n",
1385 ev->u.set_host_param.host_no);
1386 return -ENODEV;
1387 }
1388
1389 err = transport->set_host_param(shost, ev->u.set_host_param.param,
1390 data, ev->u.set_host_param.len);
1391 scsi_host_put(shost);
1392 return err;
1393}
1394
0896b752
AA		 1395static int
1396iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1397{
1398 int err = 0;
1399 struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1400 struct iscsi_transport *transport = NULL;
1401 struct iscsi_internal *priv;
7b7232f3
MC		 1402 struct iscsi_cls_session *session;
1403 struct iscsi_cls_conn *conn;
d82ff9be 1404 struct iscsi_endpoint *ep = NULL;
0896b752 1405
0896b752
AA		 1406 priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
1407 if (!priv)
1408 return -EINVAL;
1409 transport = priv->iscsi_transport;
1410
7b7232f3
MC		 1411 if (!try_module_get(transport->owner))
1412 return -EINVAL;
1413
790f39a2
MC		 1414 priv->daemon_pid = NETLINK_CREDS(skb)->pid;
1415
0896b752
AA		 1416 switch (nlh->nlmsg_type) {
1417 case ISCSI_UEVENT_CREATE_SESSION:
d82ff9be 1418 err = iscsi_if_create_session(priv, ep, ev,
40753caa
MC		 1419 ev->u.c_session.initial_cmdsn,
1420 ev->u.c_session.cmds_max,
1421 ev->u.c_session.queue_depth);
1422 break;
1423 case ISCSI_UEVENT_CREATE_BOUND_SESSION:
d82ff9be 1424 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
c95fddc7
MC		 1425 if (!ep) {
1426 err = -EINVAL;
1427 break;
1428 }
d82ff9be
MC		 1429
1430 err = iscsi_if_create_session(priv, ep, ev,
40753caa
MC		 1431 ev->u.c_bound_session.initial_cmdsn,
1432 ev->u.c_bound_session.cmds_max,
1433 ev->u.c_bound_session.queue_depth);
0896b752
AA		 1434 break;
1435 case ISCSI_UEVENT_DESTROY_SESSION:
b5c7a12d 1436 session = iscsi_session_lookup(ev->u.d_session.sid);
26974789 1437 if (session)
7b7232f3 1438 transport->destroy_session(session);
26974789
MC		 1439 else
1440 err = -EINVAL;
1441 break;
1442 case ISCSI_UEVENT_UNBIND_SESSION:
1443 session = iscsi_session_lookup(ev->u.d_session.sid);
1444 if (session)
06d25af4
MC		 1445 scsi_queue_work(iscsi_session_to_shost(session),
1446 &session->unbind_work);
26974789 1447 else
7b7232f3 1448 err = -EINVAL;
0896b752
AA		 1449 break;
1450 case ISCSI_UEVENT_CREATE_CONN:
1451 err = iscsi_if_create_conn(transport, ev);
1452 break;
1453 case ISCSI_UEVENT_DESTROY_CONN:
1454 err = iscsi_if_destroy_conn(transport, ev);
1455 break;
1456 case ISCSI_UEVENT_BIND_CONN:
b5c7a12d
MC		 1457 session = iscsi_session_lookup(ev->u.b_conn.sid);
1458 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
7b7232f3
MC		 1459
1460 if (session && conn)
1461 ev->r.retcode = transport->bind_conn(session, conn,
264faaaa 1462 ev->u.b_conn.transport_eph,
7b7232f3
MC		 1463 ev->u.b_conn.is_leading);
1464 else
1465 err = -EINVAL;
0896b752
AA		 1466 break;
1467 case ISCSI_UEVENT_SET_PARAM:
fd7255f5 1468 err = iscsi_set_param(transport, ev);
0896b752
AA		 1469 break;
1470 case ISCSI_UEVENT_START_CONN:
b5c7a12d 1471 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
7b7232f3
MC		 1472 if (conn)
1473 ev->r.retcode = transport->start_conn(conn);
1474 else
1475 err = -EINVAL;
0896b752
AA		 1476 break;
1477 case ISCSI_UEVENT_STOP_CONN:
b5c7a12d 1478 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
7b7232f3
MC		 1479 if (conn)
1480 transport->stop_conn(conn, ev->u.stop_conn.flag);
1481 else
1482 err = -EINVAL;
0896b752
AA		 1483 break;
1484 case ISCSI_UEVENT_SEND_PDU:
b5c7a12d 1485 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
7b7232f3
MC		 1486 if (conn)
1487 ev->r.retcode = transport->send_pdu(conn,
1488 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
1489 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
1490 ev->u.send_pdu.data_size);
1491 else
1492 err = -EINVAL;
0896b752
AA		 1493 break;
1494 case ISCSI_UEVENT_GET_STATS:
5b940adf 1495 err = iscsi_if_get_stats(transport, nlh);
0896b752 1496 break;
264faaaa
OG		 1497 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1498 case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1499 case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
10eb0f01 1500 case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
264faaaa
OG		 1501 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
1502 break;
01cb225d
MC		 1503 case ISCSI_UEVENT_TGT_DSCVR:
1504 err = iscsi_tgt_dscvr(transport, ev);
1505 break;
1d9bf13a
MC		 1506 case ISCSI_UEVENT_SET_HOST_PARAM:
1507 err = iscsi_set_host_param(transport, ev);
1508 break;
0896b752 1509 default:
1d9bf13a 1510 err = -ENOSYS;
0896b752
AA		 1511 break;
1512 }
1513
7b7232f3 1514 module_put(transport->owner);
0896b752
AA		 1515 return err;
1516}
1517
b5c7a12d 1518/*
cd40b7d3
DL		 1519 * Get message from skb. Each message is processed by iscsi_if_recv_msg.
1520 * Malformed skbs with wrong lengths or invalid creds are not processed.
b5c7a12d 1521 */
0896b752 1522static void
cd40b7d3 1523iscsi_if_rx(struct sk_buff *skb)
0896b752 1524{
0b950672 1525 mutex_lock(&rx_queue_mutex);
cd40b7d3
DL		 1526 while (skb->len >= NLMSG_SPACE(0)) {
1527 int err;
1528 uint32_t rlen;
1529 struct nlmsghdr *nlh;
1530 struct iscsi_uevent *ev;
1531
1532 nlh = nlmsg_hdr(skb);
1533 if (nlh->nlmsg_len < sizeof(*nlh) ||
1534 skb->len < nlh->nlmsg_len) {
1535 break;
ee7f8e40 1536 }
ee7f8e40 1537
cd40b7d3
DL		 1538 ev = NLMSG_DATA(nlh);
1539 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
1540 if (rlen > skb->len)
1541 rlen = skb->len;
0896b752 1542
cd40b7d3
DL		 1543 err = iscsi_if_recv_msg(skb, nlh);
1544 if (err) {
1545 ev->type = ISCSI_KEVENT_IF_ERROR;
1546 ev->iferror = err;
0896b752 1547 }
cd40b7d3
DL		 1548 do {
1549 /*
1550 * special case for GET_STATS:
1551 * on success - sending reply and stats from
1552 * inside of if_recv_msg(),
1553 * on error - fall through.
1554 */
1555 if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
1556 break;
1557 err = iscsi_if_send_reply(
1558 NETLINK_CREDS(skb)->pid, nlh->nlmsg_seq,
1559 nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
1560 } while (err < 0 && err != -ECONNREFUSED);
1561 skb_pull(skb, rlen);
0896b752 1562 }
0b950672 1563 mutex_unlock(&rx_queue_mutex);
0896b752 1564}
1da177e4 1565
fd7255f5 1566#define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \
ee959b00 1567struct device_attribute dev_attr_##_prefix##_##_name = \
fd7255f5
MC		 1568 __ATTR(_name,_mode,_show,_store)
1569
1da177e4 1570/*
0896b752 1571 * iSCSI connection attrs
1da177e4 1572 */
a54a52ca 1573#define iscsi_conn_attr_show(param) \
0896b752 1574static ssize_t \
ee959b00
TJ		 1575show_conn_param_##param(struct device *dev, \
1576 struct device_attribute *attr, char *buf) \
0896b752 1577{ \
ee959b00 1578 struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \
7b8631b5 1579 struct iscsi_transport *t = conn->transport; \
a54a52ca 1580 return t->get_conn_param(conn, param, buf); \
0896b752
AA		 1581}
1582
a54a52ca
MC		 1583#define iscsi_conn_attr(field, param) \
1584 iscsi_conn_attr_show(param) \
1585static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param, \
fd7255f5 1586 NULL);
0896b752 1587
a54a52ca
MC		 1588iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
1589iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
1590iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
1591iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
1592iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
1593iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
1594iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
1595iscsi_conn_attr(port, ISCSI_PARAM_CONN_PORT);
1596iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
1597iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
1598iscsi_conn_attr(address, ISCSI_PARAM_CONN_ADDRESS);
f6d5180c
MC		 1599iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
1600iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
1da177e4
LT		 1601
1602/*
0896b752 1603 * iSCSI session attrs
1da177e4 1604 */
b2c64167 1605#define iscsi_session_attr_show(param, perm) \
fd7255f5 1606static ssize_t \
ee959b00
TJ		 1607show_session_param_##param(struct device *dev, \
1608 struct device_attribute *attr, char *buf) \
fd7255f5 1609{ \
ee959b00
TJ		 1610 struct iscsi_cls_session *session = \
1611 iscsi_dev_to_session(dev->parent); \
fd7255f5 1612 struct iscsi_transport *t = session->transport; \
b2c64167
MC		 1613 \
1614 if (perm && !capable(CAP_SYS_ADMIN)) \
1615 return -EACCES; \
a54a52ca 1616 return t->get_session_param(session, param, buf); \
fd7255f5
MC		 1617}
1618
b2c64167
MC		 1619#define iscsi_session_attr(field, param, perm) \
1620 iscsi_session_attr_show(param, perm) \
a54a52ca 1621static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
fd7255f5
MC		 1622 NULL);
1623
b2c64167
MC		 1624iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
1625iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
1626iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
1627iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
1628iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
1629iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
1630iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
1631iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
1632iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
1633iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
1634iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
1635iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
1636iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
1637iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
4cd49ea1
MC		 1638iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
1639iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
1640iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
88dfd340
MC		 1641iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
1642iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0)
1da177e4 1643
6eabafbe 1644static ssize_t
ee959b00
TJ		 1645show_priv_session_state(struct device *dev, struct device_attribute *attr,
1646 char *buf)
6eabafbe 1647{
ee959b00 1648 struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
6eabafbe
MC		 1649 return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
1650}
1651static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
1652 NULL);
1653
fd7255f5
MC		 1654#define iscsi_priv_session_attr_show(field, format) \
1655static ssize_t \
ee959b00
TJ		 1656show_priv_session_##field(struct device *dev, \
1657 struct device_attribute *attr, char *buf) \
fd7255f5 1658{ \
ee959b00
TJ		 1659 struct iscsi_cls_session *session = \
1660 iscsi_dev_to_session(dev->parent); \
fd7255f5
MC		 1661 return sprintf(buf, format"\n", session->field); \
1662}
1663
1664#define iscsi_priv_session_attr(field, format) \
1665 iscsi_priv_session_attr_show(field, format) \
1666static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO, show_priv_session_##field, \
1667 NULL)
30a6c652 1668iscsi_priv_session_attr(recovery_tmo, "%d");
fd7255f5 1669
1819dc81
MC		 1670/*
1671 * iSCSI host attrs
1672 */
1673#define iscsi_host_attr_show(param) \
1674static ssize_t \
ee959b00
TJ		 1675show_host_param_##param(struct device *dev, \
1676 struct device_attribute *attr, char *buf) \
1819dc81 1677{ \
ee959b00 1678 struct Scsi_Host *shost = transport_class_to_shost(dev); \
1819dc81
MC		 1679 struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
1680 return priv->iscsi_transport->get_host_param(shost, param, buf); \
1681}
1682
1683#define iscsi_host_attr(field, param) \
1684 iscsi_host_attr_show(param) \
1685static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param, \
1686 NULL);
1687
d8196ed2 1688iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
1819dc81 1689iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
d8196ed2 1690iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
8ad5781a 1691iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
1819dc81 1692
fd7255f5
MC		 1693#define SETUP_PRIV_SESSION_RD_ATTR(field) \
1694do { \
ee959b00 1695 priv->session_attrs[count] = &dev_attr_priv_sess_##field; \
fd7255f5
MC		 1696 count++; \
1697} while (0)
1698
a54a52ca 1699
fd7255f5
MC		 1700#define SETUP_SESSION_RD_ATTR(field, param_flag) \
1701do { \
1702 if (tt->param_mask & param_flag) { \
ee959b00 1703 priv->session_attrs[count] = &dev_attr_sess_##field; \
1da177e4 1704 count++; \
fd7255f5
MC		 1705 } \
1706} while (0)
1707
fd7255f5
MC		 1708#define SETUP_CONN_RD_ATTR(field, param_flag) \
1709do { \
1710 if (tt->param_mask & param_flag) { \
ee959b00 1711 priv->conn_attrs[count] = &dev_attr_conn_##field; \
fd7255f5
MC		 1712 count++; \
1713 } \
1714} while (0)
1da177e4 1715
1819dc81
MC		 1716#define SETUP_HOST_RD_ATTR(field, param_flag) \
1717do { \
1718 if (tt->host_param_mask & param_flag) { \
ee959b00 1719 priv->host_attrs[count] = &dev_attr_host_##field; \
1819dc81
MC		 1720 count++; \
1721 } \
1722} while (0)
1723
0896b752
AA		 1724static int iscsi_session_match(struct attribute_container *cont,
1725 struct device *dev)
1da177e4 1726{
7b8631b5 1727 struct iscsi_cls_session *session;
1da177e4 1728 struct Scsi_Host *shost;
0896b752
AA		 1729 struct iscsi_internal *priv;
1730
1731 if (!iscsi_is_session_dev(dev))
1732 return 0;
1da177e4 1733
7b8631b5
MC		 1734 session = iscsi_dev_to_session(dev);
1735 shost = iscsi_session_to_shost(session);
0896b752 1736 if (!shost->transportt)
1da177e4
LT		 1737 return 0;
1738
0896b752
AA		 1739 priv = to_iscsi_internal(shost->transportt);
1740 if (priv->session_cont.ac.class != &iscsi_session_class.class)
1da177e4
LT		 1741 return 0;
1742
0896b752 1743 return &priv->session_cont.ac == cont;
1da177e4
LT		 1744}
1745
0896b752
AA		 1746static int iscsi_conn_match(struct attribute_container *cont,
1747 struct device *dev)
1748{
7b8631b5
MC		 1749 struct iscsi_cls_session *session;
1750 struct iscsi_cls_conn *conn;
1da177e4 1751 struct Scsi_Host *shost;
0896b752 1752 struct iscsi_internal *priv;
1da177e4 1753
0896b752 1754 if (!iscsi_is_conn_dev(dev))
1da177e4
LT		 1755 return 0;
1756
7b8631b5
MC		 1757 conn = iscsi_dev_to_conn(dev);
1758 session = iscsi_dev_to_session(conn->dev.parent);
1759 shost = iscsi_session_to_shost(session);
1760
0896b752 1761 if (!shost->transportt)
1da177e4
LT		 1762 return 0;
1763
0896b752
AA		 1764 priv = to_iscsi_internal(shost->transportt);
1765 if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
1766 return 0;
1da177e4 1767
0896b752
AA		 1768 return &priv->conn_cont.ac == cont;
1769}
1770
30a6c652
MC		 1771static int iscsi_host_match(struct attribute_container *cont,
1772 struct device *dev)
1773{
1774 struct Scsi_Host *shost;
1775 struct iscsi_internal *priv;
1776
1777 if (!scsi_is_host_device(dev))
1778 return 0;
1779
1780 shost = dev_to_shost(dev);
1781 if (!shost->transportt ||
1782 shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
1783 return 0;
1784
1785 priv = to_iscsi_internal(shost->transportt);
1786 return &priv->t.host_attrs.ac == cont;
1787}
1788
7b8631b5
MC		 1789struct scsi_transport_template *
1790iscsi_register_transport(struct iscsi_transport *tt)
0896b752
AA		 1791{
1792 struct iscsi_internal *priv;
1793 unsigned long flags;
1794 int count = 0, err;
1795
1796 BUG_ON(!tt);
1797
1798 priv = iscsi_if_transport_lookup(tt);
1799 if (priv)
7b8631b5 1800 return NULL;
0896b752 1801
24669f75 1802 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
0896b752 1803 if (!priv)
7b8631b5 1804 return NULL;
0896b752 1805 INIT_LIST_HEAD(&priv->list);
53cb8a1f 1806 priv->daemon_pid = -1;
0896b752 1807 priv->iscsi_transport = tt;
30a6c652 1808 priv->t.user_scan = iscsi_user_scan;
06d25af4 1809 priv->t.create_work_queue = 1;
0896b752 1810
ee959b00 1811 priv->dev.class = &iscsi_transport_class;
71610f55 1812 dev_set_name(&priv->dev, "%s", tt->name);
ee959b00 1813 err = device_register(&priv->dev);
0896b752
AA		 1814 if (err)
1815 goto free_priv;
1816
ee959b00 1817 err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
0896b752 1818 if (err)
ee959b00 1819 goto unregister_dev;
0896b752 1820
30a6c652
MC		 1821 /* host parameters */
1822 priv->t.host_attrs.ac.attrs = &priv->host_attrs[0];
1823 priv->t.host_attrs.ac.class = &iscsi_host_class.class;
1824 priv->t.host_attrs.ac.match = iscsi_host_match;
32c6e1b9 1825 priv->t.host_size = sizeof(struct iscsi_cls_host);
30a6c652
MC		 1826 transport_container_register(&priv->t.host_attrs);
1827
d8196ed2 1828 SETUP_HOST_RD_ATTR(netdev, ISCSI_HOST_NETDEV_NAME);
22236961 1829 SETUP_HOST_RD_ATTR(ipaddress, ISCSI_HOST_IPADDRESS);
1819dc81 1830 SETUP_HOST_RD_ATTR(hwaddress, ISCSI_HOST_HWADDRESS);
8ad5781a 1831 SETUP_HOST_RD_ATTR(initiatorname, ISCSI_HOST_INITIATOR_NAME);
1819dc81
MC		 1832 BUG_ON(count > ISCSI_HOST_ATTRS);
1833 priv->host_attrs[count] = NULL;
1834 count = 0;
1835
0896b752
AA		 1836 /* connection parameters */
1837 priv->conn_cont.ac.attrs = &priv->conn_attrs[0];
1838 priv->conn_cont.ac.class = &iscsi_connection_class.class;
1839 priv->conn_cont.ac.match = iscsi_conn_match;
1840 transport_container_register(&priv->conn_cont);
1da177e4 1841
fd7255f5
MC		 1842 SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_MAX_RECV_DLENGTH);
1843 SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_MAX_XMIT_DLENGTH);
1844 SETUP_CONN_RD_ATTR(header_digest, ISCSI_HDRDGST_EN);
1845 SETUP_CONN_RD_ATTR(data_digest, ISCSI_DATADGST_EN);
1846 SETUP_CONN_RD_ATTR(ifmarker, ISCSI_IFMARKER_EN);
1847 SETUP_CONN_RD_ATTR(ofmarker, ISCSI_OFMARKER_EN);
1848 SETUP_CONN_RD_ATTR(address, ISCSI_CONN_ADDRESS);
1849 SETUP_CONN_RD_ATTR(port, ISCSI_CONN_PORT);
8d2860b3 1850 SETUP_CONN_RD_ATTR(exp_statsn, ISCSI_EXP_STATSN);
a54a52ca
MC		 1851 SETUP_CONN_RD_ATTR(persistent_address, ISCSI_PERSISTENT_ADDRESS);
1852 SETUP_CONN_RD_ATTR(persistent_port, ISCSI_PERSISTENT_PORT);
f6d5180c
MC		 1853 SETUP_CONN_RD_ATTR(ping_tmo, ISCSI_PING_TMO);
1854 SETUP_CONN_RD_ATTR(recv_tmo, ISCSI_RECV_TMO);
0896b752
AA		 1855
1856 BUG_ON(count > ISCSI_CONN_ATTRS);
1857 priv->conn_attrs[count] = NULL;
1da177e4 1858 count = 0;
1da177e4 1859
0896b752
AA		 1860 /* session parameters */
1861 priv->session_cont.ac.attrs = &priv->session_attrs[0];
1862 priv->session_cont.ac.class = &iscsi_session_class.class;
1863 priv->session_cont.ac.match = iscsi_session_match;
1864 transport_container_register(&priv->session_cont);
1865
fd7255f5
MC		 1866 SETUP_SESSION_RD_ATTR(initial_r2t, ISCSI_INITIAL_R2T_EN);
1867 SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_MAX_R2T);
1868 SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_IMM_DATA_EN);
1869 SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_FIRST_BURST);
1870 SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_MAX_BURST);
1871 SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PDU_INORDER_EN);
1872 SETUP_SESSION_RD_ATTR(data_seq_in_order, ISCSI_DATASEQ_INORDER_EN);
1873 SETUP_SESSION_RD_ATTR(erl, ISCSI_ERL);
a54a52ca
MC		 1874 SETUP_SESSION_RD_ATTR(targetname, ISCSI_TARGET_NAME);
1875 SETUP_SESSION_RD_ATTR(tpgt, ISCSI_TPGT);
b2c64167
MC		 1876 SETUP_SESSION_RD_ATTR(password, ISCSI_USERNAME);
1877 SETUP_SESSION_RD_ATTR(password_in, ISCSI_USERNAME_IN);
1878 SETUP_SESSION_RD_ATTR(username, ISCSI_PASSWORD);
1879 SETUP_SESSION_RD_ATTR(username_in, ISCSI_PASSWORD_IN);
843c0a8a 1880 SETUP_SESSION_RD_ATTR(fast_abort, ISCSI_FAST_ABORT);
4cd49ea1
MC		 1881 SETUP_SESSION_RD_ATTR(abort_tmo, ISCSI_ABORT_TMO);
1882 SETUP_SESSION_RD_ATTR(lu_reset_tmo,ISCSI_LU_RESET_TMO);
88dfd340
MC		 1883 SETUP_SESSION_RD_ATTR(ifacename, ISCSI_IFACE_NAME);
1884 SETUP_SESSION_RD_ATTR(initiatorname, ISCSI_INITIATOR_NAME);
30a6c652 1885 SETUP_PRIV_SESSION_RD_ATTR(recovery_tmo);
6eabafbe 1886 SETUP_PRIV_SESSION_RD_ATTR(state);
fd7255f5 1887
0896b752
AA		 1888 BUG_ON(count > ISCSI_SESSION_ATTRS);
1889 priv->session_attrs[count] = NULL;
1890
1891 spin_lock_irqsave(&iscsi_transport_lock, flags);
1892 list_add(&priv->list, &iscsi_transports);
1893 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1894
1895 printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
7b8631b5 1896 return &priv->t;
1da177e4 1897
ee959b00
TJ		 1898unregister_dev:
1899 device_unregister(&priv->dev);
d82ff9be 1900 return NULL;
0896b752
AA		 1901free_priv:
1902 kfree(priv);
7b8631b5 1903 return NULL;
1da177e4 1904}
0896b752
AA		 1905EXPORT_SYMBOL_GPL(iscsi_register_transport);
1906
1907int iscsi_unregister_transport(struct iscsi_transport *tt)
1908{
1909 struct iscsi_internal *priv;
1910 unsigned long flags;
1911
1912 BUG_ON(!tt);
1913
0b950672 1914 mutex_lock(&rx_queue_mutex);
0896b752
AA		 1915
1916 priv = iscsi_if_transport_lookup(tt);
1917 BUG_ON (!priv);
1918
0896b752
AA		 1919 spin_lock_irqsave(&iscsi_transport_lock, flags);
1920 list_del(&priv->list);
1921 spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1922
1923 transport_container_unregister(&priv->conn_cont);
1924 transport_container_unregister(&priv->session_cont);
30a6c652 1925 transport_container_unregister(&priv->t.host_attrs);
0896b752 1926
ee959b00
TJ		 1927 sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
1928 device_unregister(&priv->dev);
0b950672 1929 mutex_unlock(&rx_queue_mutex);
1da177e4 1930
0896b752
AA		 1931 return 0;
1932}
1933EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
1da177e4 1934
1da177e4
LT		 1935static __init int iscsi_transport_init(void)
1936{
0896b752 1937 int err;
1da177e4 1938
09492605 1939 printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
f4246b33
MC		 1940 ISCSI_TRANSPORT_VERSION);
1941
41be1444
MC		 1942 atomic_set(&iscsi_session_nr, 0);
1943
0896b752 1944 err = class_register(&iscsi_transport_class);
1da177e4
LT		 1945 if (err)
1946 return err;
0896b752 1947
d82ff9be 1948 err = class_register(&iscsi_endpoint_class);
0896b752
AA		 1949 if (err)
1950 goto unregister_transport_class;
1951
d82ff9be
MC		 1952 err = transport_class_register(&iscsi_host_class);
1953 if (err)
1954 goto unregister_endpoint_class;
1955
30a6c652
MC		 1956 err = transport_class_register(&iscsi_connection_class);
1957 if (err)
1958 goto unregister_host_class;
1959
0896b752
AA		 1960 err = transport_class_register(&iscsi_session_class);
1961 if (err)
1962 goto unregister_conn_class;
1963
d82ff9be
MC		 1964 nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, 1, iscsi_if_rx,
1965 NULL, THIS_MODULE);
0896b752
AA		 1966 if (!nls) {
1967 err = -ENOBUFS;
43a145a3 1968 goto unregister_session_class;
0896b752
AA		 1969 }
1970
d8bf541e
MC		 1971 iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
1972 if (!iscsi_eh_timer_workq)
1973 goto release_nls;
1974
43a145a3 1975 return 0;
0896b752 1976
d8bf541e 1977release_nls:
b7c6ba6e 1978 netlink_kernel_release(nls);
0896b752
AA		 1979unregister_session_class:
1980 transport_class_unregister(&iscsi_session_class);
1981unregister_conn_class:
1982 transport_class_unregister(&iscsi_connection_class);
30a6c652
MC		 1983unregister_host_class:
1984 transport_class_unregister(&iscsi_host_class);
d82ff9be
MC		 1985unregister_endpoint_class:
1986 class_unregister(&iscsi_endpoint_class);
0896b752
AA		 1987unregister_transport_class:
1988 class_unregister(&iscsi_transport_class);
1989 return err;
1da177e4
LT		 1990}
1991
1992static void __exit iscsi_transport_exit(void)
1993{
d8bf541e 1994 destroy_workqueue(iscsi_eh_timer_workq);
b7c6ba6e 1995 netlink_kernel_release(nls);
0896b752
AA		 1996 transport_class_unregister(&iscsi_connection_class);
1997 transport_class_unregister(&iscsi_session_class);
30a6c652 1998 transport_class_unregister(&iscsi_host_class);
d82ff9be 1999 class_unregister(&iscsi_endpoint_class);
0896b752 2000 class_unregister(&iscsi_transport_class);
1da177e4
LT		 2001}
2002
2003module_init(iscsi_transport_init);
2004module_exit(iscsi_transport_exit);
2005
0896b752
AA		 2006MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
2007 "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
2008 "Alex Aizman <itn780@yahoo.com>");
2009MODULE_DESCRIPTION("iSCSI Transport Interface");
1da177e4 2010MODULE_LICENSE("GPL");
f4246b33 2011MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
Linux kernel - Deliverables
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