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Commit | Line | Data |
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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> | |
0896b752 | 24 | #include <linux/mempool.h> |
0b950672 | 25 | #include <linux/mutex.h> |
0896b752 | 26 | #include <net/tcp.h> |
1da177e4 LT |
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> | |
0896b752 | 32 | #include <scsi/iscsi_if.h> |
1da177e4 | 33 | |
30a6c652 | 34 | #define ISCSI_SESSION_ATTRS 11 |
8d2860b3 | 35 | #define ISCSI_CONN_ATTRS 11 |
30a6c652 | 36 | #define ISCSI_HOST_ATTRS 0 |
1da177e4 LT |
37 | |
38 | struct iscsi_internal { | |
790f39a2 | 39 | int daemon_pid; |
1da177e4 | 40 | struct scsi_transport_template t; |
0896b752 AA |
41 | struct iscsi_transport *iscsi_transport; |
42 | struct list_head list; | |
0896b752 | 43 | struct class_device cdev; |
30a6c652 MC |
44 | |
45 | struct class_device_attribute *host_attrs[ISCSI_HOST_ATTRS + 1]; | |
0896b752 AA |
46 | struct transport_container conn_cont; |
47 | struct class_device_attribute *conn_attrs[ISCSI_CONN_ATTRS + 1]; | |
48 | struct transport_container session_cont; | |
1da177e4 | 49 | struct class_device_attribute *session_attrs[ISCSI_SESSION_ATTRS + 1]; |
1da177e4 LT |
50 | }; |
51 | ||
b5c7a12d MC |
52 | static int iscsi_session_nr; /* sysfs session id for next new session */ |
53 | ||
0896b752 AA |
54 | /* |
55 | * list of registered transports and lock that must | |
56 | * be held while accessing list. The iscsi_transport_lock must | |
0b950672 | 57 | * be acquired after the rx_queue_mutex. |
0896b752 AA |
58 | */ |
59 | static LIST_HEAD(iscsi_transports); | |
60 | static DEFINE_SPINLOCK(iscsi_transport_lock); | |
61 | ||
62 | #define to_iscsi_internal(tmpl) \ | |
63 | container_of(tmpl, struct iscsi_internal, t) | |
64 | ||
65 | #define cdev_to_iscsi_internal(_cdev) \ | |
66 | container_of(_cdev, struct iscsi_internal, cdev) | |
67 | ||
68 | static void iscsi_transport_release(struct class_device *cdev) | |
69 | { | |
70 | struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev); | |
71 | kfree(priv); | |
72 | } | |
1da177e4 | 73 | |
0896b752 AA |
74 | /* |
75 | * iscsi_transport_class represents the iscsi_transports that are | |
76 | * registered. | |
77 | */ | |
78 | static struct class iscsi_transport_class = { | |
79 | .name = "iscsi_transport", | |
80 | .release = iscsi_transport_release, | |
81 | }; | |
82 | ||
83 | static ssize_t | |
84 | show_transport_handle(struct class_device *cdev, char *buf) | |
85 | { | |
86 | struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev); | |
762e2bfa | 87 | return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport)); |
0896b752 AA |
88 | } |
89 | static CLASS_DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL); | |
90 | ||
91 | #define show_transport_attr(name, format) \ | |
92 | static ssize_t \ | |
93 | show_transport_##name(struct class_device *cdev, char *buf) \ | |
94 | { \ | |
95 | struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev); \ | |
96 | return sprintf(buf, format"\n", priv->iscsi_transport->name); \ | |
97 | } \ | |
98 | static CLASS_DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL); | |
99 | ||
100 | show_transport_attr(caps, "0x%x"); | |
101 | show_transport_attr(max_lun, "%d"); | |
102 | show_transport_attr(max_conn, "%d"); | |
103 | show_transport_attr(max_cmd_len, "%d"); | |
104 | ||
105 | static struct attribute *iscsi_transport_attrs[] = { | |
106 | &class_device_attr_handle.attr, | |
107 | &class_device_attr_caps.attr, | |
108 | &class_device_attr_max_lun.attr, | |
109 | &class_device_attr_max_conn.attr, | |
110 | &class_device_attr_max_cmd_len.attr, | |
111 | NULL, | |
112 | }; | |
113 | ||
114 | static struct attribute_group iscsi_transport_group = { | |
115 | .attrs = iscsi_transport_attrs, | |
116 | }; | |
117 | ||
30a6c652 MC |
118 | static int iscsi_setup_host(struct transport_container *tc, struct device *dev, |
119 | struct class_device *cdev) | |
120 | { | |
121 | struct Scsi_Host *shost = dev_to_shost(dev); | |
122 | struct iscsi_host *ihost = shost->shost_data; | |
123 | ||
124 | memset(ihost, 0, sizeof(*ihost)); | |
125 | INIT_LIST_HEAD(&ihost->sessions); | |
126 | mutex_init(&ihost->mutex); | |
127 | return 0; | |
128 | } | |
129 | ||
130 | static DECLARE_TRANSPORT_CLASS(iscsi_host_class, | |
131 | "iscsi_host", | |
132 | iscsi_setup_host, | |
133 | NULL, | |
134 | NULL); | |
135 | ||
0896b752 AA |
136 | static DECLARE_TRANSPORT_CLASS(iscsi_session_class, |
137 | "iscsi_session", | |
1da177e4 LT |
138 | NULL, |
139 | NULL, | |
140 | NULL); | |
141 | ||
0896b752 AA |
142 | static DECLARE_TRANSPORT_CLASS(iscsi_connection_class, |
143 | "iscsi_connection", | |
1da177e4 LT |
144 | NULL, |
145 | NULL, | |
146 | NULL); | |
0896b752 AA |
147 | |
148 | static struct sock *nls; | |
0b950672 | 149 | static DEFINE_MUTEX(rx_queue_mutex); |
0896b752 AA |
150 | |
151 | struct mempool_zone { | |
152 | mempool_t *pool; | |
153 | atomic_t allocated; | |
154 | int size; | |
155 | int hiwat; | |
156 | struct list_head freequeue; | |
157 | spinlock_t freelock; | |
158 | }; | |
159 | ||
7b8631b5 | 160 | static struct mempool_zone *z_reply; |
0896b752 | 161 | |
1da177e4 | 162 | /* |
0896b752 AA |
163 | * Z_MAX_* - actual mempool size allocated at the mempool_zone_init() time |
164 | * Z_HIWAT_* - zone's high watermark when if_error bit will be set to -ENOMEM | |
165 | * so daemon will notice OOM on NETLINK tranposrt level and will | |
166 | * be able to predict or change operational behavior | |
1da177e4 | 167 | */ |
0896b752 AA |
168 | #define Z_MAX_REPLY 8 |
169 | #define Z_HIWAT_REPLY 6 | |
170 | #define Z_MAX_PDU 8 | |
171 | #define Z_HIWAT_PDU 6 | |
172 | #define Z_MAX_ERROR 16 | |
173 | #define Z_HIWAT_ERROR 12 | |
174 | ||
7b7232f3 MC |
175 | static LIST_HEAD(sesslist); |
176 | static DEFINE_SPINLOCK(sesslock); | |
7b8631b5 MC |
177 | static LIST_HEAD(connlist); |
178 | static DEFINE_SPINLOCK(connlock); | |
0896b752 | 179 | |
b5c7a12d MC |
180 | static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn) |
181 | { | |
182 | struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent); | |
183 | return sess->sid; | |
184 | } | |
185 | ||
186 | /* | |
187 | * Returns the matching session to a given sid | |
188 | */ | |
189 | static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid) | |
7b7232f3 MC |
190 | { |
191 | unsigned long flags; | |
192 | struct iscsi_cls_session *sess; | |
193 | ||
194 | spin_lock_irqsave(&sesslock, flags); | |
195 | list_for_each_entry(sess, &sesslist, sess_list) { | |
b5c7a12d | 196 | if (sess->sid == sid) { |
7b7232f3 MC |
197 | spin_unlock_irqrestore(&sesslock, flags); |
198 | return sess; | |
199 | } | |
200 | } | |
201 | spin_unlock_irqrestore(&sesslock, flags); | |
202 | return NULL; | |
203 | } | |
204 | ||
b5c7a12d MC |
205 | /* |
206 | * Returns the matching connection to a given sid / cid tuple | |
207 | */ | |
208 | static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid) | |
7b7232f3 MC |
209 | { |
210 | unsigned long flags; | |
211 | struct iscsi_cls_conn *conn; | |
212 | ||
213 | spin_lock_irqsave(&connlock, flags); | |
214 | list_for_each_entry(conn, &connlist, conn_list) { | |
b5c7a12d | 215 | if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) { |
7b7232f3 MC |
216 | spin_unlock_irqrestore(&connlock, flags); |
217 | return conn; | |
218 | } | |
219 | } | |
220 | spin_unlock_irqrestore(&connlock, flags); | |
221 | return NULL; | |
222 | } | |
223 | ||
7b8631b5 MC |
224 | /* |
225 | * The following functions can be used by LLDs that allocate | |
226 | * their own scsi_hosts or by software iscsi LLDs | |
227 | */ | |
228 | static void iscsi_session_release(struct device *dev) | |
229 | { | |
230 | struct iscsi_cls_session *session = iscsi_dev_to_session(dev); | |
7b8631b5 | 231 | struct Scsi_Host *shost; |
0896b752 | 232 | |
7b8631b5 MC |
233 | shost = iscsi_session_to_shost(session); |
234 | scsi_host_put(shost); | |
235 | kfree(session); | |
7b8631b5 | 236 | } |
0896b752 | 237 | |
7b8631b5 MC |
238 | static int iscsi_is_session_dev(const struct device *dev) |
239 | { | |
240 | return dev->release == iscsi_session_release; | |
241 | } | |
0896b752 | 242 | |
30a6c652 MC |
243 | static int iscsi_user_scan(struct Scsi_Host *shost, uint channel, |
244 | uint id, uint lun) | |
245 | { | |
246 | struct iscsi_host *ihost = shost->shost_data; | |
247 | struct iscsi_cls_session *session; | |
248 | ||
249 | mutex_lock(&ihost->mutex); | |
250 | list_for_each_entry(session, &ihost->sessions, host_list) { | |
e6f3b63f | 251 | if ((channel == SCAN_WILD_CARD || channel == 0) && |
30a6c652 | 252 | (id == SCAN_WILD_CARD || id == session->target_id)) |
e6f3b63f | 253 | scsi_scan_target(&session->dev, 0, |
30a6c652 MC |
254 | session->target_id, lun, 1); |
255 | } | |
256 | mutex_unlock(&ihost->mutex); | |
257 | ||
258 | return 0; | |
259 | } | |
260 | ||
261 | static void session_recovery_timedout(void *data) | |
262 | { | |
263 | struct iscsi_cls_session *session = data; | |
264 | ||
be2df72e OG |
265 | dev_printk(KERN_INFO, &session->dev, "iscsi: session recovery timed " |
266 | "out after %d secs\n", session->recovery_tmo); | |
30a6c652 MC |
267 | |
268 | if (session->transport->session_recovery_timedout) | |
269 | session->transport->session_recovery_timedout(session); | |
270 | ||
271 | scsi_target_unblock(&session->dev); | |
272 | } | |
273 | ||
274 | void iscsi_unblock_session(struct iscsi_cls_session *session) | |
275 | { | |
276 | if (!cancel_delayed_work(&session->recovery_work)) | |
277 | flush_scheduled_work(); | |
278 | scsi_target_unblock(&session->dev); | |
279 | } | |
280 | EXPORT_SYMBOL_GPL(iscsi_unblock_session); | |
281 | ||
282 | void iscsi_block_session(struct iscsi_cls_session *session) | |
283 | { | |
284 | scsi_target_block(&session->dev); | |
285 | schedule_delayed_work(&session->recovery_work, | |
286 | session->recovery_tmo * HZ); | |
287 | } | |
288 | EXPORT_SYMBOL_GPL(iscsi_block_session); | |
289 | ||
7b8631b5 MC |
290 | /** |
291 | * iscsi_create_session - create iscsi class session | |
292 | * @shost: scsi host | |
293 | * @transport: iscsi transport | |
294 | * | |
b5c7a12d | 295 | * This can be called from a LLD or iscsi_transport. |
7b8631b5 MC |
296 | **/ |
297 | struct iscsi_cls_session * | |
30a6c652 | 298 | iscsi_create_session(struct Scsi_Host *shost, |
e6f3b63f | 299 | struct iscsi_transport *transport) |
7b8631b5 | 300 | { |
30a6c652 | 301 | struct iscsi_host *ihost; |
7b8631b5 MC |
302 | struct iscsi_cls_session *session; |
303 | int err; | |
304 | ||
b5c7a12d MC |
305 | session = kzalloc(sizeof(*session) + transport->sessiondata_size, |
306 | GFP_KERNEL); | |
7b8631b5 | 307 | if (!session) |
f53a88da MC |
308 | return NULL; |
309 | ||
7b8631b5 | 310 | session->transport = transport; |
30a6c652 MC |
311 | session->recovery_tmo = 120; |
312 | INIT_WORK(&session->recovery_work, session_recovery_timedout, session); | |
313 | INIT_LIST_HEAD(&session->host_list); | |
314 | INIT_LIST_HEAD(&session->sess_list); | |
7b8631b5 | 315 | |
b5c7a12d MC |
316 | if (transport->sessiondata_size) |
317 | session->dd_data = &session[1]; | |
318 | ||
7b8631b5 MC |
319 | /* this is released in the dev's release function */ |
320 | scsi_host_get(shost); | |
30a6c652 MC |
321 | ihost = shost->shost_data; |
322 | ||
b5c7a12d | 323 | session->sid = iscsi_session_nr++; |
30a6c652 MC |
324 | session->target_id = ihost->next_target_id++; |
325 | ||
b5c7a12d MC |
326 | snprintf(session->dev.bus_id, BUS_ID_SIZE, "session%u", |
327 | session->sid); | |
7b8631b5 MC |
328 | session->dev.parent = &shost->shost_gendev; |
329 | session->dev.release = iscsi_session_release; | |
330 | err = device_register(&session->dev); | |
331 | if (err) { | |
332 | dev_printk(KERN_ERR, &session->dev, "iscsi: could not " | |
333 | "register session's dev\n"); | |
334 | goto free_session; | |
335 | } | |
336 | transport_register_device(&session->dev); | |
337 | ||
30a6c652 MC |
338 | mutex_lock(&ihost->mutex); |
339 | list_add(&session->host_list, &ihost->sessions); | |
340 | mutex_unlock(&ihost->mutex); | |
341 | ||
7b8631b5 MC |
342 | return session; |
343 | ||
344 | free_session: | |
345 | kfree(session); | |
7b8631b5 MC |
346 | return NULL; |
347 | } | |
348 | ||
349 | EXPORT_SYMBOL_GPL(iscsi_create_session); | |
350 | ||
351 | /** | |
352 | * iscsi_destroy_session - destroy iscsi session | |
353 | * @session: iscsi_session | |
354 | * | |
355 | * Can be called by a LLD or iscsi_transport. There must not be | |
356 | * any running connections. | |
357 | **/ | |
358 | int iscsi_destroy_session(struct iscsi_cls_session *session) | |
359 | { | |
30a6c652 MC |
360 | struct Scsi_Host *shost = iscsi_session_to_shost(session); |
361 | struct iscsi_host *ihost = shost->shost_data; | |
362 | ||
363 | if (!cancel_delayed_work(&session->recovery_work)) | |
364 | flush_scheduled_work(); | |
365 | ||
366 | mutex_lock(&ihost->mutex); | |
367 | list_del(&session->host_list); | |
368 | mutex_unlock(&ihost->mutex); | |
369 | ||
7b8631b5 MC |
370 | transport_unregister_device(&session->dev); |
371 | device_unregister(&session->dev); | |
372 | return 0; | |
373 | } | |
374 | ||
375 | EXPORT_SYMBOL_GPL(iscsi_destroy_session); | |
376 | ||
377 | static void iscsi_conn_release(struct device *dev) | |
378 | { | |
379 | struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev); | |
380 | struct device *parent = conn->dev.parent; | |
381 | ||
382 | kfree(conn); | |
383 | put_device(parent); | |
384 | } | |
385 | ||
386 | static int iscsi_is_conn_dev(const struct device *dev) | |
387 | { | |
388 | return dev->release == iscsi_conn_release; | |
389 | } | |
390 | ||
391 | /** | |
392 | * iscsi_create_conn - create iscsi class connection | |
393 | * @session: iscsi cls session | |
394 | * @cid: connection id | |
395 | * | |
396 | * This can be called from a LLD or iscsi_transport. The connection | |
397 | * is child of the session so cid must be unique for all connections | |
398 | * on the session. | |
b5c7a12d MC |
399 | * |
400 | * Since we do not support MCS, cid will normally be zero. In some cases | |
401 | * for software iscsi we could be trying to preallocate a connection struct | |
402 | * in which case there could be two connection structs and cid would be | |
403 | * non-zero. | |
7b8631b5 MC |
404 | **/ |
405 | struct iscsi_cls_conn * | |
406 | iscsi_create_conn(struct iscsi_cls_session *session, uint32_t cid) | |
407 | { | |
408 | struct iscsi_transport *transport = session->transport; | |
7b8631b5 MC |
409 | struct iscsi_cls_conn *conn; |
410 | int err; | |
411 | ||
412 | conn = kzalloc(sizeof(*conn) + transport->conndata_size, GFP_KERNEL); | |
413 | if (!conn) | |
414 | return NULL; | |
415 | ||
416 | if (transport->conndata_size) | |
417 | conn->dd_data = &conn[1]; | |
418 | ||
419 | INIT_LIST_HEAD(&conn->conn_list); | |
420 | conn->transport = transport; | |
b5c7a12d | 421 | conn->cid = cid; |
7b8631b5 MC |
422 | |
423 | /* this is released in the dev's release function */ | |
424 | if (!get_device(&session->dev)) | |
425 | goto free_conn; | |
b5c7a12d | 426 | |
7b8631b5 | 427 | snprintf(conn->dev.bus_id, BUS_ID_SIZE, "connection%d:%u", |
b5c7a12d | 428 | session->sid, cid); |
7b8631b5 MC |
429 | conn->dev.parent = &session->dev; |
430 | conn->dev.release = iscsi_conn_release; | |
431 | err = device_register(&conn->dev); | |
432 | if (err) { | |
433 | dev_printk(KERN_ERR, &conn->dev, "iscsi: could not register " | |
434 | "connection's dev\n"); | |
435 | goto release_parent_ref; | |
436 | } | |
437 | transport_register_device(&conn->dev); | |
438 | return conn; | |
439 | ||
440 | release_parent_ref: | |
441 | put_device(&session->dev); | |
442 | free_conn: | |
443 | kfree(conn); | |
444 | return NULL; | |
445 | } | |
446 | ||
447 | EXPORT_SYMBOL_GPL(iscsi_create_conn); | |
448 | ||
449 | /** | |
450 | * iscsi_destroy_conn - destroy iscsi class connection | |
451 | * @session: iscsi cls session | |
452 | * | |
453 | * This can be called from a LLD or iscsi_transport. | |
454 | **/ | |
455 | int iscsi_destroy_conn(struct iscsi_cls_conn *conn) | |
456 | { | |
457 | transport_unregister_device(&conn->dev); | |
458 | device_unregister(&conn->dev); | |
459 | return 0; | |
460 | } | |
461 | ||
462 | EXPORT_SYMBOL_GPL(iscsi_destroy_conn); | |
463 | ||
7b8631b5 MC |
464 | /* |
465 | * iscsi interface functions | |
466 | */ | |
0896b752 AA |
467 | static struct iscsi_internal * |
468 | iscsi_if_transport_lookup(struct iscsi_transport *tt) | |
469 | { | |
470 | struct iscsi_internal *priv; | |
471 | unsigned long flags; | |
472 | ||
473 | spin_lock_irqsave(&iscsi_transport_lock, flags); | |
474 | list_for_each_entry(priv, &iscsi_transports, list) { | |
475 | if (tt == priv->iscsi_transport) { | |
476 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
477 | return priv; | |
478 | } | |
479 | } | |
480 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
481 | return NULL; | |
482 | } | |
1da177e4 | 483 | |
0896b752 AA |
484 | static inline struct list_head *skb_to_lh(struct sk_buff *skb) |
485 | { | |
486 | return (struct list_head *)&skb->cb; | |
487 | } | |
1da177e4 | 488 | |
0896b752 | 489 | static void* |
28e5554d | 490 | mempool_zone_alloc_skb(gfp_t gfp_mask, void *pool_data) |
0896b752 AA |
491 | { |
492 | struct mempool_zone *zone = pool_data; | |
1da177e4 | 493 | |
0896b752 | 494 | return alloc_skb(zone->size, gfp_mask); |
1da177e4 LT |
495 | } |
496 | ||
0896b752 AA |
497 | static void |
498 | mempool_zone_free_skb(void *element, void *pool_data) | |
499 | { | |
500 | kfree_skb(element); | |
501 | } | |
1da177e4 | 502 | |
0896b752 AA |
503 | static void |
504 | mempool_zone_complete(struct mempool_zone *zone) | |
505 | { | |
506 | unsigned long flags; | |
507 | struct list_head *lh, *n; | |
1da177e4 | 508 | |
0896b752 AA |
509 | spin_lock_irqsave(&zone->freelock, flags); |
510 | list_for_each_safe(lh, n, &zone->freequeue) { | |
511 | struct sk_buff *skb = (struct sk_buff *)((char *)lh - | |
512 | offsetof(struct sk_buff, cb)); | |
513 | if (!skb_shared(skb)) { | |
514 | list_del(skb_to_lh(skb)); | |
515 | mempool_free(skb, zone->pool); | |
516 | atomic_dec(&zone->allocated); | |
517 | } | |
518 | } | |
519 | spin_unlock_irqrestore(&zone->freelock, flags); | |
1da177e4 LT |
520 | } |
521 | ||
7b8631b5 MC |
522 | static struct mempool_zone * |
523 | mempool_zone_init(unsigned max, unsigned size, unsigned hiwat) | |
0896b752 | 524 | { |
7b8631b5 MC |
525 | struct mempool_zone *zp; |
526 | ||
527 | zp = kzalloc(sizeof(*zp), GFP_KERNEL); | |
528 | if (!zp) | |
529 | return NULL; | |
530 | ||
142e301f MC |
531 | zp->size = size; |
532 | zp->hiwat = hiwat; | |
533 | INIT_LIST_HEAD(&zp->freequeue); | |
534 | spin_lock_init(&zp->freelock); | |
535 | atomic_set(&zp->allocated, 0); | |
536 | ||
0896b752 AA |
537 | zp->pool = mempool_create(max, mempool_zone_alloc_skb, |
538 | mempool_zone_free_skb, zp); | |
7b8631b5 MC |
539 | if (!zp->pool) { |
540 | kfree(zp); | |
541 | return NULL; | |
542 | } | |
1da177e4 | 543 | |
7b8631b5 | 544 | return zp; |
0896b752 AA |
545 | } |
546 | ||
7b8631b5 MC |
547 | static void mempool_zone_destroy(struct mempool_zone *zp) |
548 | { | |
549 | mempool_destroy(zp->pool); | |
550 | kfree(zp); | |
551 | } | |
0896b752 AA |
552 | |
553 | static struct sk_buff* | |
554 | mempool_zone_get_skb(struct mempool_zone *zone) | |
1da177e4 | 555 | { |
0896b752 AA |
556 | struct sk_buff *skb; |
557 | ||
558 | skb = mempool_alloc(zone->pool, GFP_ATOMIC); | |
559 | if (skb) | |
560 | atomic_inc(&zone->allocated); | |
561 | return skb; | |
562 | } | |
1da177e4 | 563 | |
0896b752 | 564 | static int |
790f39a2 | 565 | iscsi_unicast_skb(struct mempool_zone *zone, struct sk_buff *skb, int pid) |
0896b752 AA |
566 | { |
567 | unsigned long flags; | |
568 | int rc; | |
1da177e4 | 569 | |
0896b752 | 570 | skb_get(skb); |
790f39a2 | 571 | rc = netlink_unicast(nls, skb, pid, MSG_DONTWAIT); |
0896b752 AA |
572 | if (rc < 0) { |
573 | mempool_free(skb, zone->pool); | |
574 | printk(KERN_ERR "iscsi: can not unicast skb (%d)\n", rc); | |
575 | return rc; | |
576 | } | |
577 | ||
578 | spin_lock_irqsave(&zone->freelock, flags); | |
30a6c652 | 579 | INIT_LIST_HEAD(skb_to_lh(skb)); |
0896b752 AA |
580 | list_add(skb_to_lh(skb), &zone->freequeue); |
581 | spin_unlock_irqrestore(&zone->freelock, flags); | |
582 | ||
583 | return 0; | |
1da177e4 | 584 | } |
1da177e4 | 585 | |
7b7232f3 | 586 | int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr, |
0896b752 | 587 | char *data, uint32_t data_size) |
1da177e4 | 588 | { |
0896b752 AA |
589 | struct nlmsghdr *nlh; |
590 | struct sk_buff *skb; | |
591 | struct iscsi_uevent *ev; | |
0896b752 | 592 | char *pdu; |
790f39a2 | 593 | struct iscsi_internal *priv; |
0896b752 AA |
594 | int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) + |
595 | data_size); | |
596 | ||
790f39a2 MC |
597 | priv = iscsi_if_transport_lookup(conn->transport); |
598 | if (!priv) | |
599 | return -EINVAL; | |
600 | ||
7b8631b5 | 601 | mempool_zone_complete(conn->z_pdu); |
0896b752 | 602 | |
7b8631b5 | 603 | skb = mempool_zone_get_skb(conn->z_pdu); |
0896b752 | 604 | if (!skb) { |
7b7232f3 | 605 | iscsi_conn_error(conn, ISCSI_ERR_CONN_FAILED); |
7b8631b5 MC |
606 | dev_printk(KERN_ERR, &conn->dev, "iscsi: can not deliver " |
607 | "control PDU: OOM\n"); | |
0896b752 AA |
608 | return -ENOMEM; |
609 | } | |
1da177e4 | 610 | |
790f39a2 | 611 | nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0); |
0896b752 AA |
612 | ev = NLMSG_DATA(nlh); |
613 | memset(ev, 0, sizeof(*ev)); | |
614 | ev->transport_handle = iscsi_handle(conn->transport); | |
615 | ev->type = ISCSI_KEVENT_RECV_PDU; | |
7b8631b5 | 616 | if (atomic_read(&conn->z_pdu->allocated) >= conn->z_pdu->hiwat) |
0896b752 | 617 | ev->iferror = -ENOMEM; |
b5c7a12d MC |
618 | ev->r.recv_req.cid = conn->cid; |
619 | ev->r.recv_req.sid = iscsi_conn_get_sid(conn); | |
0896b752 AA |
620 | pdu = (char*)ev + sizeof(*ev); |
621 | memcpy(pdu, hdr, sizeof(struct iscsi_hdr)); | |
622 | memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size); | |
1da177e4 | 623 | |
790f39a2 | 624 | return iscsi_unicast_skb(conn->z_pdu, skb, priv->daemon_pid); |
1da177e4 | 625 | } |
0896b752 | 626 | EXPORT_SYMBOL_GPL(iscsi_recv_pdu); |
1da177e4 | 627 | |
7b7232f3 | 628 | void iscsi_conn_error(struct iscsi_cls_conn *conn, enum iscsi_err error) |
1da177e4 | 629 | { |
0896b752 AA |
630 | struct nlmsghdr *nlh; |
631 | struct sk_buff *skb; | |
632 | struct iscsi_uevent *ev; | |
790f39a2 | 633 | struct iscsi_internal *priv; |
0896b752 AA |
634 | int len = NLMSG_SPACE(sizeof(*ev)); |
635 | ||
790f39a2 MC |
636 | priv = iscsi_if_transport_lookup(conn->transport); |
637 | if (!priv) | |
638 | return; | |
639 | ||
7b8631b5 | 640 | mempool_zone_complete(conn->z_error); |
0896b752 | 641 | |
7b8631b5 | 642 | skb = mempool_zone_get_skb(conn->z_error); |
0896b752 | 643 | if (!skb) { |
7b8631b5 MC |
644 | dev_printk(KERN_ERR, &conn->dev, "iscsi: gracefully ignored " |
645 | "conn error (%d)\n", error); | |
0896b752 AA |
646 | return; |
647 | } | |
648 | ||
790f39a2 | 649 | nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0); |
0896b752 AA |
650 | ev = NLMSG_DATA(nlh); |
651 | ev->transport_handle = iscsi_handle(conn->transport); | |
652 | ev->type = ISCSI_KEVENT_CONN_ERROR; | |
7b8631b5 | 653 | if (atomic_read(&conn->z_error->allocated) >= conn->z_error->hiwat) |
0896b752 AA |
654 | ev->iferror = -ENOMEM; |
655 | ev->r.connerror.error = error; | |
b5c7a12d MC |
656 | ev->r.connerror.cid = conn->cid; |
657 | ev->r.connerror.sid = iscsi_conn_get_sid(conn); | |
1da177e4 | 658 | |
790f39a2 | 659 | iscsi_unicast_skb(conn->z_error, skb, priv->daemon_pid); |
1da177e4 | 660 | |
7b8631b5 MC |
661 | dev_printk(KERN_INFO, &conn->dev, "iscsi: detected conn error (%d)\n", |
662 | error); | |
0896b752 AA |
663 | } |
664 | EXPORT_SYMBOL_GPL(iscsi_conn_error); | |
665 | ||
666 | static int | |
667 | iscsi_if_send_reply(int pid, int seq, int type, int done, int multi, | |
668 | void *payload, int size) | |
669 | { | |
670 | struct sk_buff *skb; | |
671 | struct nlmsghdr *nlh; | |
672 | int len = NLMSG_SPACE(size); | |
673 | int flags = multi ? NLM_F_MULTI : 0; | |
674 | int t = done ? NLMSG_DONE : type; | |
675 | ||
7b8631b5 | 676 | mempool_zone_complete(z_reply); |
0896b752 | 677 | |
7b8631b5 | 678 | skb = mempool_zone_get_skb(z_reply); |
0896b752 AA |
679 | /* |
680 | * FIXME: | |
681 | * user is supposed to react on iferror == -ENOMEM; | |
682 | * see iscsi_if_rx(). | |
683 | */ | |
684 | BUG_ON(!skb); | |
685 | ||
686 | nlh = __nlmsg_put(skb, pid, seq, t, (len - sizeof(*nlh)), 0); | |
687 | nlh->nlmsg_flags = flags; | |
688 | memcpy(NLMSG_DATA(nlh), payload, size); | |
790f39a2 | 689 | return iscsi_unicast_skb(z_reply, skb, pid); |
1da177e4 | 690 | } |
1da177e4 | 691 | |
7b8631b5 | 692 | static int |
5b940adf | 693 | iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh) |
7b8631b5 MC |
694 | { |
695 | struct iscsi_uevent *ev = NLMSG_DATA(nlh); | |
696 | struct iscsi_stats *stats; | |
697 | struct sk_buff *skbstat; | |
698 | struct iscsi_cls_conn *conn; | |
699 | struct nlmsghdr *nlhstat; | |
700 | struct iscsi_uevent *evstat; | |
790f39a2 | 701 | struct iscsi_internal *priv; |
7b8631b5 MC |
702 | int len = NLMSG_SPACE(sizeof(*ev) + |
703 | sizeof(struct iscsi_stats) + | |
704 | sizeof(struct iscsi_stats_custom) * | |
705 | ISCSI_STATS_CUSTOM_MAX); | |
706 | int err = 0; | |
0896b752 | 707 | |
790f39a2 MC |
708 | priv = iscsi_if_transport_lookup(transport); |
709 | if (!priv) | |
710 | return -EINVAL; | |
711 | ||
b5c7a12d | 712 | conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid); |
7b8631b5 MC |
713 | if (!conn) |
714 | return -EEXIST; | |
0896b752 | 715 | |
7b8631b5 MC |
716 | do { |
717 | int actual_size; | |
0896b752 | 718 | |
7b8631b5 | 719 | mempool_zone_complete(conn->z_pdu); |
0896b752 | 720 | |
7b8631b5 MC |
721 | skbstat = mempool_zone_get_skb(conn->z_pdu); |
722 | if (!skbstat) { | |
723 | dev_printk(KERN_ERR, &conn->dev, "iscsi: can not " | |
724 | "deliver stats: OOM\n"); | |
725 | return -ENOMEM; | |
726 | } | |
727 | ||
790f39a2 | 728 | nlhstat = __nlmsg_put(skbstat, priv->daemon_pid, 0, 0, |
7b8631b5 MC |
729 | (len - sizeof(*nlhstat)), 0); |
730 | evstat = NLMSG_DATA(nlhstat); | |
731 | memset(evstat, 0, sizeof(*evstat)); | |
732 | evstat->transport_handle = iscsi_handle(conn->transport); | |
733 | evstat->type = nlh->nlmsg_type; | |
734 | if (atomic_read(&conn->z_pdu->allocated) >= conn->z_pdu->hiwat) | |
735 | evstat->iferror = -ENOMEM; | |
b5c7a12d MC |
736 | evstat->u.get_stats.cid = |
737 | ev->u.get_stats.cid; | |
738 | evstat->u.get_stats.sid = | |
739 | ev->u.get_stats.sid; | |
7b8631b5 MC |
740 | stats = (struct iscsi_stats *) |
741 | ((char*)evstat + sizeof(*evstat)); | |
742 | memset(stats, 0, sizeof(*stats)); | |
743 | ||
7b7232f3 | 744 | transport->get_stats(conn, stats); |
7b8631b5 MC |
745 | actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) + |
746 | sizeof(struct iscsi_stats) + | |
747 | sizeof(struct iscsi_stats_custom) * | |
748 | stats->custom_length); | |
749 | actual_size -= sizeof(*nlhstat); | |
750 | actual_size = NLMSG_LENGTH(actual_size); | |
5b940adf | 751 | skb_trim(skbstat, NLMSG_ALIGN(actual_size)); |
7b8631b5 MC |
752 | nlhstat->nlmsg_len = actual_size; |
753 | ||
790f39a2 | 754 | err = iscsi_unicast_skb(conn->z_pdu, skbstat, priv->daemon_pid); |
7b8631b5 MC |
755 | } while (err < 0 && err != -ECONNREFUSED); |
756 | ||
757 | return err; | |
0896b752 AA |
758 | } |
759 | ||
760 | static int | |
761 | iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_uevent *ev) | |
762 | { | |
763 | struct iscsi_transport *transport = priv->iscsi_transport; | |
7b7232f3 | 764 | struct iscsi_cls_session *session; |
7996a778 | 765 | unsigned long flags; |
b5c7a12d | 766 | uint32_t hostno; |
0896b752 | 767 | |
7996a778 | 768 | session = transport->create_session(transport, &priv->t, |
7b7232f3 | 769 | ev->u.c_session.initial_cmdsn, |
b5c7a12d | 770 | &hostno); |
7b7232f3 | 771 | if (!session) |
7b8631b5 | 772 | return -ENOMEM; |
0896b752 | 773 | |
7996a778 MC |
774 | spin_lock_irqsave(&sesslock, flags); |
775 | list_add(&session->sess_list, &sesslist); | |
776 | spin_unlock_irqrestore(&sesslock, flags); | |
777 | ||
b5c7a12d MC |
778 | ev->r.c_session_ret.host_no = hostno; |
779 | ev->r.c_session_ret.sid = session->sid; | |
0896b752 | 780 | return 0; |
0896b752 AA |
781 | } |
782 | ||
783 | static int | |
7b7232f3 | 784 | iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev) |
0896b752 | 785 | { |
7b8631b5 | 786 | struct iscsi_cls_conn *conn; |
7b7232f3 | 787 | struct iscsi_cls_session *session; |
0896b752 | 788 | unsigned long flags; |
7b8631b5 | 789 | |
b5c7a12d MC |
790 | session = iscsi_session_lookup(ev->u.c_conn.sid); |
791 | if (!session) { | |
792 | printk(KERN_ERR "iscsi: invalid session %d\n", | |
793 | ev->u.c_conn.sid); | |
7b8631b5 | 794 | return -EINVAL; |
b5c7a12d | 795 | } |
0896b752 | 796 | |
7b7232f3 | 797 | conn = transport->create_conn(session, ev->u.c_conn.cid); |
b5c7a12d MC |
798 | if (!conn) { |
799 | printk(KERN_ERR "iscsi: couldn't create a new " | |
800 | "connection for session %d\n", | |
801 | session->sid); | |
7b7232f3 | 802 | return -ENOMEM; |
b5c7a12d | 803 | } |
0896b752 | 804 | |
7b8631b5 | 805 | conn->z_pdu = mempool_zone_init(Z_MAX_PDU, |
0896b752 AA |
806 | NLMSG_SPACE(sizeof(struct iscsi_uevent) + |
807 | sizeof(struct iscsi_hdr) + | |
808 | DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH), | |
809 | Z_HIWAT_PDU); | |
7b8631b5 MC |
810 | if (!conn->z_pdu) { |
811 | dev_printk(KERN_ERR, &conn->dev, "iscsi: can not allocate " | |
812 | "pdu zone for new conn\n"); | |
813 | goto destroy_conn; | |
0896b752 | 814 | } |
7b8631b5 MC |
815 | |
816 | conn->z_error = mempool_zone_init(Z_MAX_ERROR, | |
0896b752 AA |
817 | NLMSG_SPACE(sizeof(struct iscsi_uevent)), |
818 | Z_HIWAT_ERROR); | |
7b8631b5 MC |
819 | if (!conn->z_error) { |
820 | dev_printk(KERN_ERR, &conn->dev, "iscsi: can not allocate " | |
821 | "error zone for new conn\n"); | |
822 | goto free_pdu_pool; | |
0896b752 AA |
823 | } |
824 | ||
b5c7a12d MC |
825 | ev->r.c_conn_ret.sid = session->sid; |
826 | ev->r.c_conn_ret.cid = conn->cid; | |
0896b752 AA |
827 | |
828 | spin_lock_irqsave(&connlock, flags); | |
829 | list_add(&conn->conn_list, &connlist); | |
0896b752 AA |
830 | conn->active = 1; |
831 | spin_unlock_irqrestore(&connlock, flags); | |
832 | ||
0896b752 AA |
833 | return 0; |
834 | ||
7b8631b5 MC |
835 | free_pdu_pool: |
836 | mempool_zone_destroy(conn->z_pdu); | |
837 | destroy_conn: | |
838 | if (transport->destroy_conn) | |
839 | transport->destroy_conn(conn->dd_data); | |
7b8631b5 | 840 | return -ENOMEM; |
1da177e4 LT |
841 | } |
842 | ||
0896b752 AA |
843 | static int |
844 | iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev) | |
845 | { | |
846 | unsigned long flags; | |
7b8631b5 MC |
847 | struct iscsi_cls_conn *conn; |
848 | struct mempool_zone *z_error, *z_pdu; | |
0896b752 | 849 | |
b5c7a12d | 850 | conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid); |
0896b752 | 851 | if (!conn) |
7b8631b5 | 852 | return -EINVAL; |
0896b752 AA |
853 | spin_lock_irqsave(&connlock, flags); |
854 | conn->active = 0; | |
855 | list_del(&conn->conn_list); | |
856 | spin_unlock_irqrestore(&connlock, flags); | |
857 | ||
7b8631b5 MC |
858 | z_pdu = conn->z_pdu; |
859 | z_error = conn->z_error; | |
0896b752 | 860 | |
7b8631b5 MC |
861 | if (transport->destroy_conn) |
862 | transport->destroy_conn(conn); | |
0896b752 | 863 | |
7b8631b5 MC |
864 | mempool_zone_destroy(z_pdu); |
865 | mempool_zone_destroy(z_error); | |
0896b752 | 866 | |
7b8631b5 | 867 | return 0; |
0896b752 AA |
868 | } |
869 | ||
fd7255f5 MC |
870 | static int |
871 | iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev) | |
872 | { | |
873 | char *data = (char*)ev + sizeof(*ev); | |
874 | struct iscsi_cls_conn *conn; | |
875 | struct iscsi_cls_session *session; | |
a54a52ca | 876 | int err = 0, value = 0; |
fd7255f5 MC |
877 | |
878 | session = iscsi_session_lookup(ev->u.set_param.sid); | |
879 | conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid); | |
880 | if (!conn || !session) | |
881 | return -EINVAL; | |
882 | ||
883 | switch (ev->u.set_param.param) { | |
30a6c652 | 884 | case ISCSI_PARAM_SESS_RECOVERY_TMO: |
a54a52ca | 885 | sscanf(data, "%d", &value); |
30a6c652 MC |
886 | if (value != 0) |
887 | session->recovery_tmo = value; | |
888 | break; | |
fd7255f5 | 889 | default: |
a54a52ca MC |
890 | err = transport->set_param(conn, ev->u.set_param.param, |
891 | data, ev->u.set_param.len); | |
fd7255f5 MC |
892 | } |
893 | ||
894 | return err; | |
895 | } | |
896 | ||
264faaaa OG |
897 | static int |
898 | iscsi_if_transport_ep(struct iscsi_transport *transport, | |
899 | struct iscsi_uevent *ev, int msg_type) | |
900 | { | |
901 | struct sockaddr *dst_addr; | |
902 | int rc = 0; | |
903 | ||
904 | switch (msg_type) { | |
905 | case ISCSI_UEVENT_TRANSPORT_EP_CONNECT: | |
906 | if (!transport->ep_connect) | |
907 | return -EINVAL; | |
908 | ||
909 | dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev)); | |
910 | rc = transport->ep_connect(dst_addr, | |
911 | ev->u.ep_connect.non_blocking, | |
912 | &ev->r.ep_connect_ret.handle); | |
913 | break; | |
914 | case ISCSI_UEVENT_TRANSPORT_EP_POLL: | |
915 | if (!transport->ep_poll) | |
916 | return -EINVAL; | |
917 | ||
918 | ev->r.retcode = transport->ep_poll(ev->u.ep_poll.ep_handle, | |
919 | ev->u.ep_poll.timeout_ms); | |
920 | break; | |
921 | case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT: | |
922 | if (!transport->ep_disconnect) | |
923 | return -EINVAL; | |
924 | ||
925 | transport->ep_disconnect(ev->u.ep_disconnect.ep_handle); | |
926 | break; | |
927 | } | |
928 | return rc; | |
929 | } | |
930 | ||
01cb225d MC |
931 | static int |
932 | iscsi_tgt_dscvr(struct iscsi_transport *transport, | |
933 | struct iscsi_uevent *ev) | |
934 | { | |
935 | struct sockaddr *dst_addr; | |
936 | ||
937 | if (!transport->tgt_dscvr) | |
938 | return -EINVAL; | |
939 | ||
940 | dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev)); | |
941 | return transport->tgt_dscvr(ev->u.tgt_dscvr.type, | |
942 | ev->u.tgt_dscvr.host_no, | |
943 | ev->u.tgt_dscvr.enable, dst_addr); | |
944 | } | |
945 | ||
0896b752 AA |
946 | static int |
947 | iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) | |
948 | { | |
949 | int err = 0; | |
950 | struct iscsi_uevent *ev = NLMSG_DATA(nlh); | |
951 | struct iscsi_transport *transport = NULL; | |
952 | struct iscsi_internal *priv; | |
7b7232f3 MC |
953 | struct iscsi_cls_session *session; |
954 | struct iscsi_cls_conn *conn; | |
7996a778 | 955 | unsigned long flags; |
0896b752 | 956 | |
0896b752 AA |
957 | priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle)); |
958 | if (!priv) | |
959 | return -EINVAL; | |
960 | transport = priv->iscsi_transport; | |
961 | ||
7b7232f3 MC |
962 | if (!try_module_get(transport->owner)) |
963 | return -EINVAL; | |
964 | ||
790f39a2 MC |
965 | priv->daemon_pid = NETLINK_CREDS(skb)->pid; |
966 | ||
0896b752 AA |
967 | switch (nlh->nlmsg_type) { |
968 | case ISCSI_UEVENT_CREATE_SESSION: | |
969 | err = iscsi_if_create_session(priv, ev); | |
970 | break; | |
971 | case ISCSI_UEVENT_DESTROY_SESSION: | |
b5c7a12d | 972 | session = iscsi_session_lookup(ev->u.d_session.sid); |
7996a778 MC |
973 | if (session) { |
974 | spin_lock_irqsave(&sesslock, flags); | |
975 | list_del(&session->sess_list); | |
976 | spin_unlock_irqrestore(&sesslock, flags); | |
977 | ||
7b7232f3 | 978 | transport->destroy_session(session); |
7996a778 | 979 | } else |
7b7232f3 | 980 | err = -EINVAL; |
0896b752 AA |
981 | break; |
982 | case ISCSI_UEVENT_CREATE_CONN: | |
983 | err = iscsi_if_create_conn(transport, ev); | |
984 | break; | |
985 | case ISCSI_UEVENT_DESTROY_CONN: | |
986 | err = iscsi_if_destroy_conn(transport, ev); | |
987 | break; | |
988 | case ISCSI_UEVENT_BIND_CONN: | |
b5c7a12d MC |
989 | session = iscsi_session_lookup(ev->u.b_conn.sid); |
990 | conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid); | |
7b7232f3 MC |
991 | |
992 | if (session && conn) | |
993 | ev->r.retcode = transport->bind_conn(session, conn, | |
264faaaa | 994 | ev->u.b_conn.transport_eph, |
7b7232f3 MC |
995 | ev->u.b_conn.is_leading); |
996 | else | |
997 | err = -EINVAL; | |
0896b752 AA |
998 | break; |
999 | case ISCSI_UEVENT_SET_PARAM: | |
fd7255f5 | 1000 | err = iscsi_set_param(transport, ev); |
0896b752 AA |
1001 | break; |
1002 | case ISCSI_UEVENT_START_CONN: | |
b5c7a12d | 1003 | conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid); |
7b7232f3 MC |
1004 | if (conn) |
1005 | ev->r.retcode = transport->start_conn(conn); | |
1006 | else | |
1007 | err = -EINVAL; | |
0896b752 AA |
1008 | break; |
1009 | case ISCSI_UEVENT_STOP_CONN: | |
b5c7a12d | 1010 | conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid); |
7b7232f3 MC |
1011 | if (conn) |
1012 | transport->stop_conn(conn, ev->u.stop_conn.flag); | |
1013 | else | |
1014 | err = -EINVAL; | |
0896b752 AA |
1015 | break; |
1016 | case ISCSI_UEVENT_SEND_PDU: | |
b5c7a12d | 1017 | conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid); |
7b7232f3 MC |
1018 | if (conn) |
1019 | ev->r.retcode = transport->send_pdu(conn, | |
1020 | (struct iscsi_hdr*)((char*)ev + sizeof(*ev)), | |
1021 | (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size, | |
1022 | ev->u.send_pdu.data_size); | |
1023 | else | |
1024 | err = -EINVAL; | |
0896b752 AA |
1025 | break; |
1026 | case ISCSI_UEVENT_GET_STATS: | |
5b940adf | 1027 | err = iscsi_if_get_stats(transport, nlh); |
0896b752 | 1028 | break; |
264faaaa OG |
1029 | case ISCSI_UEVENT_TRANSPORT_EP_CONNECT: |
1030 | case ISCSI_UEVENT_TRANSPORT_EP_POLL: | |
1031 | case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT: | |
1032 | err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type); | |
1033 | break; | |
01cb225d MC |
1034 | case ISCSI_UEVENT_TGT_DSCVR: |
1035 | err = iscsi_tgt_dscvr(transport, ev); | |
1036 | break; | |
0896b752 AA |
1037 | default: |
1038 | err = -EINVAL; | |
1039 | break; | |
1040 | } | |
1041 | ||
7b7232f3 | 1042 | module_put(transport->owner); |
0896b752 AA |
1043 | return err; |
1044 | } | |
1045 | ||
b5c7a12d MC |
1046 | /* |
1047 | * Get message from skb (based on rtnetlink_rcv_skb). Each message is | |
1048 | * processed by iscsi_if_recv_msg. Malformed skbs with wrong lengths or | |
1049 | * invalid creds are discarded silently. | |
1050 | */ | |
0896b752 AA |
1051 | static void |
1052 | iscsi_if_rx(struct sock *sk, int len) | |
1053 | { | |
1054 | struct sk_buff *skb; | |
1da177e4 | 1055 | |
0b950672 | 1056 | mutex_lock(&rx_queue_mutex); |
0896b752 | 1057 | while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { |
ee7f8e40 MC |
1058 | if (NETLINK_CREDS(skb)->uid) { |
1059 | skb_pull(skb, skb->len); | |
1060 | goto free_skb; | |
1061 | } | |
ee7f8e40 | 1062 | |
0896b752 AA |
1063 | while (skb->len >= NLMSG_SPACE(0)) { |
1064 | int err; | |
1065 | uint32_t rlen; | |
1066 | struct nlmsghdr *nlh; | |
1067 | struct iscsi_uevent *ev; | |
1068 | ||
1069 | nlh = (struct nlmsghdr *)skb->data; | |
1070 | if (nlh->nlmsg_len < sizeof(*nlh) || | |
1071 | skb->len < nlh->nlmsg_len) { | |
1072 | break; | |
1073 | } | |
ee7f8e40 | 1074 | |
0896b752 AA |
1075 | ev = NLMSG_DATA(nlh); |
1076 | rlen = NLMSG_ALIGN(nlh->nlmsg_len); | |
1077 | if (rlen > skb->len) | |
1078 | rlen = skb->len; | |
ee7f8e40 | 1079 | |
0896b752 AA |
1080 | err = iscsi_if_recv_msg(skb, nlh); |
1081 | if (err) { | |
1082 | ev->type = ISCSI_KEVENT_IF_ERROR; | |
1083 | ev->iferror = err; | |
1084 | } | |
1085 | do { | |
1086 | /* | |
1087 | * special case for GET_STATS: | |
1088 | * on success - sending reply and stats from | |
1089 | * inside of if_recv_msg(), | |
1090 | * on error - fall through. | |
1091 | */ | |
1092 | if (ev->type == ISCSI_UEVENT_GET_STATS && !err) | |
1093 | break; | |
1094 | err = iscsi_if_send_reply( | |
1095 | NETLINK_CREDS(skb)->pid, nlh->nlmsg_seq, | |
1096 | nlh->nlmsg_type, 0, 0, ev, sizeof(*ev)); | |
7b8631b5 MC |
1097 | if (atomic_read(&z_reply->allocated) >= |
1098 | z_reply->hiwat) | |
0896b752 AA |
1099 | ev->iferror = -ENOMEM; |
1100 | } while (err < 0 && err != -ECONNREFUSED); | |
1101 | skb_pull(skb, rlen); | |
1102 | } | |
ee7f8e40 | 1103 | free_skb: |
0896b752 AA |
1104 | kfree_skb(skb); |
1105 | } | |
0b950672 | 1106 | mutex_unlock(&rx_queue_mutex); |
0896b752 | 1107 | } |
1da177e4 | 1108 | |
7b8631b5 MC |
1109 | #define iscsi_cdev_to_conn(_cdev) \ |
1110 | iscsi_dev_to_conn(_cdev->dev) | |
1111 | ||
fd7255f5 MC |
1112 | #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \ |
1113 | struct class_device_attribute class_device_attr_##_prefix##_##_name = \ | |
1114 | __ATTR(_name,_mode,_show,_store) | |
1115 | ||
1da177e4 | 1116 | /* |
0896b752 | 1117 | * iSCSI connection attrs |
1da177e4 | 1118 | */ |
a54a52ca | 1119 | #define iscsi_conn_attr_show(param) \ |
0896b752 | 1120 | static ssize_t \ |
a54a52ca | 1121 | show_conn_param_##param(struct class_device *cdev, char *buf) \ |
0896b752 | 1122 | { \ |
7b8631b5 MC |
1123 | struct iscsi_cls_conn *conn = iscsi_cdev_to_conn(cdev); \ |
1124 | struct iscsi_transport *t = conn->transport; \ | |
a54a52ca | 1125 | return t->get_conn_param(conn, param, buf); \ |
0896b752 AA |
1126 | } |
1127 | ||
a54a52ca MC |
1128 | #define iscsi_conn_attr(field, param) \ |
1129 | iscsi_conn_attr_show(param) \ | |
1130 | static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param, \ | |
fd7255f5 | 1131 | NULL); |
0896b752 | 1132 | |
a54a52ca MC |
1133 | iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH); |
1134 | iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH); | |
1135 | iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN); | |
1136 | iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN); | |
1137 | iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN); | |
1138 | iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN); | |
1139 | iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT); | |
1140 | iscsi_conn_attr(port, ISCSI_PARAM_CONN_PORT); | |
1141 | iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN); | |
1142 | iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS); | |
1143 | iscsi_conn_attr(address, ISCSI_PARAM_CONN_ADDRESS); | |
1da177e4 | 1144 | |
7b8631b5 MC |
1145 | #define iscsi_cdev_to_session(_cdev) \ |
1146 | iscsi_dev_to_session(_cdev->dev) | |
1147 | ||
1da177e4 | 1148 | /* |
0896b752 | 1149 | * iSCSI session attrs |
1da177e4 | 1150 | */ |
a54a52ca | 1151 | #define iscsi_session_attr_show(param) \ |
fd7255f5 | 1152 | static ssize_t \ |
a54a52ca | 1153 | show_session_param_##param(struct class_device *cdev, char *buf) \ |
fd7255f5 MC |
1154 | { \ |
1155 | struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev); \ | |
1156 | struct iscsi_transport *t = session->transport; \ | |
a54a52ca | 1157 | return t->get_session_param(session, param, buf); \ |
fd7255f5 MC |
1158 | } |
1159 | ||
a54a52ca MC |
1160 | #define iscsi_session_attr(field, param) \ |
1161 | iscsi_session_attr_show(param) \ | |
1162 | static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \ | |
fd7255f5 MC |
1163 | NULL); |
1164 | ||
a54a52ca MC |
1165 | iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME); |
1166 | iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN); | |
1167 | iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T); | |
1168 | iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN); | |
1169 | iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST); | |
1170 | iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST); | |
1171 | iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN); | |
1172 | iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN); | |
1173 | iscsi_session_attr(erl, ISCSI_PARAM_ERL); | |
1174 | iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT); | |
1da177e4 | 1175 | |
fd7255f5 MC |
1176 | #define iscsi_priv_session_attr_show(field, format) \ |
1177 | static ssize_t \ | |
a54a52ca | 1178 | show_priv_session_##field(struct class_device *cdev, char *buf) \ |
fd7255f5 | 1179 | { \ |
a54a52ca | 1180 | struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev);\ |
fd7255f5 MC |
1181 | return sprintf(buf, format"\n", session->field); \ |
1182 | } | |
1183 | ||
1184 | #define iscsi_priv_session_attr(field, format) \ | |
1185 | iscsi_priv_session_attr_show(field, format) \ | |
1186 | static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO, show_priv_session_##field, \ | |
1187 | NULL) | |
30a6c652 | 1188 | iscsi_priv_session_attr(recovery_tmo, "%d"); |
fd7255f5 | 1189 | |
fd7255f5 MC |
1190 | #define SETUP_PRIV_SESSION_RD_ATTR(field) \ |
1191 | do { \ | |
1192 | priv->session_attrs[count] = &class_device_attr_priv_sess_##field; \ | |
1193 | count++; \ | |
1194 | } while (0) | |
1195 | ||
a54a52ca | 1196 | |
fd7255f5 MC |
1197 | #define SETUP_SESSION_RD_ATTR(field, param_flag) \ |
1198 | do { \ | |
1199 | if (tt->param_mask & param_flag) { \ | |
1200 | priv->session_attrs[count] = &class_device_attr_sess_##field; \ | |
1da177e4 | 1201 | count++; \ |
fd7255f5 MC |
1202 | } \ |
1203 | } while (0) | |
1204 | ||
fd7255f5 MC |
1205 | #define SETUP_CONN_RD_ATTR(field, param_flag) \ |
1206 | do { \ | |
1207 | if (tt->param_mask & param_flag) { \ | |
1208 | priv->conn_attrs[count] = &class_device_attr_conn_##field; \ | |
1209 | count++; \ | |
1210 | } \ | |
1211 | } while (0) | |
1da177e4 | 1212 | |
0896b752 AA |
1213 | static int iscsi_session_match(struct attribute_container *cont, |
1214 | struct device *dev) | |
1da177e4 | 1215 | { |
7b8631b5 | 1216 | struct iscsi_cls_session *session; |
1da177e4 | 1217 | struct Scsi_Host *shost; |
0896b752 AA |
1218 | struct iscsi_internal *priv; |
1219 | ||
1220 | if (!iscsi_is_session_dev(dev)) | |
1221 | return 0; | |
1da177e4 | 1222 | |
7b8631b5 MC |
1223 | session = iscsi_dev_to_session(dev); |
1224 | shost = iscsi_session_to_shost(session); | |
0896b752 | 1225 | if (!shost->transportt) |
1da177e4 LT |
1226 | return 0; |
1227 | ||
0896b752 AA |
1228 | priv = to_iscsi_internal(shost->transportt); |
1229 | if (priv->session_cont.ac.class != &iscsi_session_class.class) | |
1da177e4 LT |
1230 | return 0; |
1231 | ||
0896b752 | 1232 | return &priv->session_cont.ac == cont; |
1da177e4 LT |
1233 | } |
1234 | ||
0896b752 AA |
1235 | static int iscsi_conn_match(struct attribute_container *cont, |
1236 | struct device *dev) | |
1237 | { | |
7b8631b5 MC |
1238 | struct iscsi_cls_session *session; |
1239 | struct iscsi_cls_conn *conn; | |
1da177e4 | 1240 | struct Scsi_Host *shost; |
0896b752 | 1241 | struct iscsi_internal *priv; |
1da177e4 | 1242 | |
0896b752 | 1243 | if (!iscsi_is_conn_dev(dev)) |
1da177e4 LT |
1244 | return 0; |
1245 | ||
7b8631b5 MC |
1246 | conn = iscsi_dev_to_conn(dev); |
1247 | session = iscsi_dev_to_session(conn->dev.parent); | |
1248 | shost = iscsi_session_to_shost(session); | |
1249 | ||
0896b752 | 1250 | if (!shost->transportt) |
1da177e4 LT |
1251 | return 0; |
1252 | ||
0896b752 AA |
1253 | priv = to_iscsi_internal(shost->transportt); |
1254 | if (priv->conn_cont.ac.class != &iscsi_connection_class.class) | |
1255 | return 0; | |
1da177e4 | 1256 | |
0896b752 AA |
1257 | return &priv->conn_cont.ac == cont; |
1258 | } | |
1259 | ||
30a6c652 MC |
1260 | static int iscsi_host_match(struct attribute_container *cont, |
1261 | struct device *dev) | |
1262 | { | |
1263 | struct Scsi_Host *shost; | |
1264 | struct iscsi_internal *priv; | |
1265 | ||
1266 | if (!scsi_is_host_device(dev)) | |
1267 | return 0; | |
1268 | ||
1269 | shost = dev_to_shost(dev); | |
1270 | if (!shost->transportt || | |
1271 | shost->transportt->host_attrs.ac.class != &iscsi_host_class.class) | |
1272 | return 0; | |
1273 | ||
1274 | priv = to_iscsi_internal(shost->transportt); | |
1275 | return &priv->t.host_attrs.ac == cont; | |
1276 | } | |
1277 | ||
7b8631b5 MC |
1278 | struct scsi_transport_template * |
1279 | iscsi_register_transport(struct iscsi_transport *tt) | |
0896b752 AA |
1280 | { |
1281 | struct iscsi_internal *priv; | |
1282 | unsigned long flags; | |
1283 | int count = 0, err; | |
1284 | ||
1285 | BUG_ON(!tt); | |
1286 | ||
1287 | priv = iscsi_if_transport_lookup(tt); | |
1288 | if (priv) | |
7b8631b5 | 1289 | return NULL; |
0896b752 | 1290 | |
24669f75 | 1291 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
0896b752 | 1292 | if (!priv) |
7b8631b5 | 1293 | return NULL; |
0896b752 | 1294 | INIT_LIST_HEAD(&priv->list); |
0896b752 | 1295 | priv->iscsi_transport = tt; |
30a6c652 | 1296 | priv->t.user_scan = iscsi_user_scan; |
0896b752 AA |
1297 | |
1298 | priv->cdev.class = &iscsi_transport_class; | |
1299 | snprintf(priv->cdev.class_id, BUS_ID_SIZE, "%s", tt->name); | |
1300 | err = class_device_register(&priv->cdev); | |
1301 | if (err) | |
1302 | goto free_priv; | |
1303 | ||
1304 | err = sysfs_create_group(&priv->cdev.kobj, &iscsi_transport_group); | |
1305 | if (err) | |
1306 | goto unregister_cdev; | |
1307 | ||
30a6c652 MC |
1308 | /* host parameters */ |
1309 | priv->t.host_attrs.ac.attrs = &priv->host_attrs[0]; | |
1310 | priv->t.host_attrs.ac.class = &iscsi_host_class.class; | |
1311 | priv->t.host_attrs.ac.match = iscsi_host_match; | |
1312 | priv->t.host_size = sizeof(struct iscsi_host); | |
1313 | priv->host_attrs[0] = NULL; | |
1314 | transport_container_register(&priv->t.host_attrs); | |
1315 | ||
0896b752 AA |
1316 | /* connection parameters */ |
1317 | priv->conn_cont.ac.attrs = &priv->conn_attrs[0]; | |
1318 | priv->conn_cont.ac.class = &iscsi_connection_class.class; | |
1319 | priv->conn_cont.ac.match = iscsi_conn_match; | |
1320 | transport_container_register(&priv->conn_cont); | |
1da177e4 | 1321 | |
fd7255f5 MC |
1322 | SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_MAX_RECV_DLENGTH); |
1323 | SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_MAX_XMIT_DLENGTH); | |
1324 | SETUP_CONN_RD_ATTR(header_digest, ISCSI_HDRDGST_EN); | |
1325 | SETUP_CONN_RD_ATTR(data_digest, ISCSI_DATADGST_EN); | |
1326 | SETUP_CONN_RD_ATTR(ifmarker, ISCSI_IFMARKER_EN); | |
1327 | SETUP_CONN_RD_ATTR(ofmarker, ISCSI_OFMARKER_EN); | |
1328 | SETUP_CONN_RD_ATTR(address, ISCSI_CONN_ADDRESS); | |
1329 | SETUP_CONN_RD_ATTR(port, ISCSI_CONN_PORT); | |
8d2860b3 | 1330 | SETUP_CONN_RD_ATTR(exp_statsn, ISCSI_EXP_STATSN); |
a54a52ca MC |
1331 | SETUP_CONN_RD_ATTR(persistent_address, ISCSI_PERSISTENT_ADDRESS); |
1332 | SETUP_CONN_RD_ATTR(persistent_port, ISCSI_PERSISTENT_PORT); | |
0896b752 AA |
1333 | |
1334 | BUG_ON(count > ISCSI_CONN_ATTRS); | |
1335 | priv->conn_attrs[count] = NULL; | |
1da177e4 | 1336 | count = 0; |
1da177e4 | 1337 | |
0896b752 AA |
1338 | /* session parameters */ |
1339 | priv->session_cont.ac.attrs = &priv->session_attrs[0]; | |
1340 | priv->session_cont.ac.class = &iscsi_session_class.class; | |
1341 | priv->session_cont.ac.match = iscsi_session_match; | |
1342 | transport_container_register(&priv->session_cont); | |
1343 | ||
fd7255f5 MC |
1344 | SETUP_SESSION_RD_ATTR(initial_r2t, ISCSI_INITIAL_R2T_EN); |
1345 | SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_MAX_R2T); | |
1346 | SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_IMM_DATA_EN); | |
1347 | SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_FIRST_BURST); | |
1348 | SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_MAX_BURST); | |
1349 | SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PDU_INORDER_EN); | |
1350 | SETUP_SESSION_RD_ATTR(data_seq_in_order, ISCSI_DATASEQ_INORDER_EN); | |
1351 | SETUP_SESSION_RD_ATTR(erl, ISCSI_ERL); | |
a54a52ca MC |
1352 | SETUP_SESSION_RD_ATTR(targetname, ISCSI_TARGET_NAME); |
1353 | SETUP_SESSION_RD_ATTR(tpgt, ISCSI_TPGT); | |
30a6c652 | 1354 | SETUP_PRIV_SESSION_RD_ATTR(recovery_tmo); |
fd7255f5 | 1355 | |
0896b752 AA |
1356 | BUG_ON(count > ISCSI_SESSION_ATTRS); |
1357 | priv->session_attrs[count] = NULL; | |
1358 | ||
1359 | spin_lock_irqsave(&iscsi_transport_lock, flags); | |
1360 | list_add(&priv->list, &iscsi_transports); | |
1361 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
1362 | ||
1363 | printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name); | |
7b8631b5 | 1364 | return &priv->t; |
1da177e4 | 1365 | |
0896b752 AA |
1366 | unregister_cdev: |
1367 | class_device_unregister(&priv->cdev); | |
1368 | free_priv: | |
1369 | kfree(priv); | |
7b8631b5 | 1370 | return NULL; |
1da177e4 | 1371 | } |
0896b752 AA |
1372 | EXPORT_SYMBOL_GPL(iscsi_register_transport); |
1373 | ||
1374 | int iscsi_unregister_transport(struct iscsi_transport *tt) | |
1375 | { | |
1376 | struct iscsi_internal *priv; | |
1377 | unsigned long flags; | |
1378 | ||
1379 | BUG_ON(!tt); | |
1380 | ||
0b950672 | 1381 | mutex_lock(&rx_queue_mutex); |
0896b752 AA |
1382 | |
1383 | priv = iscsi_if_transport_lookup(tt); | |
1384 | BUG_ON (!priv); | |
1385 | ||
0896b752 AA |
1386 | spin_lock_irqsave(&iscsi_transport_lock, flags); |
1387 | list_del(&priv->list); | |
1388 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
1389 | ||
1390 | transport_container_unregister(&priv->conn_cont); | |
1391 | transport_container_unregister(&priv->session_cont); | |
30a6c652 | 1392 | transport_container_unregister(&priv->t.host_attrs); |
0896b752 AA |
1393 | |
1394 | sysfs_remove_group(&priv->cdev.kobj, &iscsi_transport_group); | |
1395 | class_device_unregister(&priv->cdev); | |
0b950672 | 1396 | mutex_unlock(&rx_queue_mutex); |
1da177e4 | 1397 | |
0896b752 AA |
1398 | return 0; |
1399 | } | |
1400 | EXPORT_SYMBOL_GPL(iscsi_unregister_transport); | |
1da177e4 | 1401 | |
0896b752 AA |
1402 | static int |
1403 | iscsi_rcv_nl_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1da177e4 | 1404 | { |
0896b752 AA |
1405 | struct netlink_notify *n = ptr; |
1406 | ||
1407 | if (event == NETLINK_URELEASE && | |
1408 | n->protocol == NETLINK_ISCSI && n->pid) { | |
7b8631b5 | 1409 | struct iscsi_cls_conn *conn; |
0896b752 AA |
1410 | unsigned long flags; |
1411 | ||
7b8631b5 | 1412 | mempool_zone_complete(z_reply); |
0896b752 AA |
1413 | spin_lock_irqsave(&connlock, flags); |
1414 | list_for_each_entry(conn, &connlist, conn_list) { | |
7b8631b5 MC |
1415 | mempool_zone_complete(conn->z_error); |
1416 | mempool_zone_complete(conn->z_pdu); | |
0896b752 AA |
1417 | } |
1418 | spin_unlock_irqrestore(&connlock, flags); | |
1419 | } | |
1da177e4 | 1420 | |
0896b752 | 1421 | return NOTIFY_DONE; |
1da177e4 LT |
1422 | } |
1423 | ||
0896b752 AA |
1424 | static struct notifier_block iscsi_nl_notifier = { |
1425 | .notifier_call = iscsi_rcv_nl_event, | |
1426 | }; | |
1da177e4 LT |
1427 | |
1428 | static __init int iscsi_transport_init(void) | |
1429 | { | |
0896b752 | 1430 | int err; |
1da177e4 | 1431 | |
0896b752 | 1432 | err = class_register(&iscsi_transport_class); |
1da177e4 LT |
1433 | if (err) |
1434 | return err; | |
0896b752 | 1435 | |
30a6c652 | 1436 | err = transport_class_register(&iscsi_host_class); |
0896b752 AA |
1437 | if (err) |
1438 | goto unregister_transport_class; | |
1439 | ||
30a6c652 MC |
1440 | err = transport_class_register(&iscsi_connection_class); |
1441 | if (err) | |
1442 | goto unregister_host_class; | |
1443 | ||
0896b752 AA |
1444 | err = transport_class_register(&iscsi_session_class); |
1445 | if (err) | |
1446 | goto unregister_conn_class; | |
1447 | ||
1448 | err = netlink_register_notifier(&iscsi_nl_notifier); | |
1449 | if (err) | |
1450 | goto unregister_session_class; | |
1451 | ||
2290d2b6 | 1452 | nls = netlink_kernel_create(NETLINK_ISCSI, 1, iscsi_if_rx, |
7b8631b5 | 1453 | THIS_MODULE); |
0896b752 AA |
1454 | if (!nls) { |
1455 | err = -ENOBUFS; | |
1456 | goto unregister_notifier; | |
1457 | } | |
1458 | ||
7b8631b5 | 1459 | z_reply = mempool_zone_init(Z_MAX_REPLY, |
0896b752 | 1460 | NLMSG_SPACE(sizeof(struct iscsi_uevent)), Z_HIWAT_REPLY); |
7b8631b5 | 1461 | if (z_reply) |
0896b752 AA |
1462 | return 0; |
1463 | ||
1464 | sock_release(nls->sk_socket); | |
1465 | unregister_notifier: | |
1466 | netlink_unregister_notifier(&iscsi_nl_notifier); | |
1467 | unregister_session_class: | |
1468 | transport_class_unregister(&iscsi_session_class); | |
1469 | unregister_conn_class: | |
1470 | transport_class_unregister(&iscsi_connection_class); | |
30a6c652 MC |
1471 | unregister_host_class: |
1472 | transport_class_unregister(&iscsi_host_class); | |
0896b752 AA |
1473 | unregister_transport_class: |
1474 | class_unregister(&iscsi_transport_class); | |
1475 | return err; | |
1da177e4 LT |
1476 | } |
1477 | ||
1478 | static void __exit iscsi_transport_exit(void) | |
1479 | { | |
7b8631b5 | 1480 | mempool_zone_destroy(z_reply); |
0896b752 AA |
1481 | sock_release(nls->sk_socket); |
1482 | netlink_unregister_notifier(&iscsi_nl_notifier); | |
1483 | transport_class_unregister(&iscsi_connection_class); | |
1484 | transport_class_unregister(&iscsi_session_class); | |
30a6c652 | 1485 | transport_class_unregister(&iscsi_host_class); |
0896b752 | 1486 | class_unregister(&iscsi_transport_class); |
1da177e4 LT |
1487 | } |
1488 | ||
1489 | module_init(iscsi_transport_init); | |
1490 | module_exit(iscsi_transport_exit); | |
1491 | ||
0896b752 AA |
1492 | MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, " |
1493 | "Dmitry Yusupov <dmitry_yus@yahoo.com>, " | |
1494 | "Alex Aizman <itn780@yahoo.com>"); | |
1495 | MODULE_DESCRIPTION("iSCSI Transport Interface"); | |
1da177e4 | 1496 | MODULE_LICENSE("GPL"); |