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); | |
231 | struct iscsi_transport *transport = session->transport; | |
232 | struct Scsi_Host *shost; | |
0896b752 | 233 | |
7b8631b5 MC |
234 | shost = iscsi_session_to_shost(session); |
235 | scsi_host_put(shost); | |
fd7255f5 | 236 | kfree(session->targetname); |
7b8631b5 MC |
237 | kfree(session); |
238 | module_put(transport->owner); | |
239 | } | |
0896b752 | 240 | |
7b8631b5 MC |
241 | static int iscsi_is_session_dev(const struct device *dev) |
242 | { | |
243 | return dev->release == iscsi_session_release; | |
244 | } | |
0896b752 | 245 | |
30a6c652 MC |
246 | static int iscsi_user_scan(struct Scsi_Host *shost, uint channel, |
247 | uint id, uint lun) | |
248 | { | |
249 | struct iscsi_host *ihost = shost->shost_data; | |
250 | struct iscsi_cls_session *session; | |
251 | ||
252 | mutex_lock(&ihost->mutex); | |
253 | list_for_each_entry(session, &ihost->sessions, host_list) { | |
254 | if ((channel == SCAN_WILD_CARD || | |
255 | channel == session->channel) && | |
256 | (id == SCAN_WILD_CARD || id == session->target_id)) | |
257 | scsi_scan_target(&session->dev, session->channel, | |
258 | session->target_id, lun, 1); | |
259 | } | |
260 | mutex_unlock(&ihost->mutex); | |
261 | ||
262 | return 0; | |
263 | } | |
264 | ||
265 | static void session_recovery_timedout(void *data) | |
266 | { | |
267 | struct iscsi_cls_session *session = data; | |
268 | ||
be2df72e OG |
269 | dev_printk(KERN_INFO, &session->dev, "iscsi: session recovery timed " |
270 | "out after %d secs\n", session->recovery_tmo); | |
30a6c652 MC |
271 | |
272 | if (session->transport->session_recovery_timedout) | |
273 | session->transport->session_recovery_timedout(session); | |
274 | ||
275 | scsi_target_unblock(&session->dev); | |
276 | } | |
277 | ||
278 | void iscsi_unblock_session(struct iscsi_cls_session *session) | |
279 | { | |
280 | if (!cancel_delayed_work(&session->recovery_work)) | |
281 | flush_scheduled_work(); | |
282 | scsi_target_unblock(&session->dev); | |
283 | } | |
284 | EXPORT_SYMBOL_GPL(iscsi_unblock_session); | |
285 | ||
286 | void iscsi_block_session(struct iscsi_cls_session *session) | |
287 | { | |
288 | scsi_target_block(&session->dev); | |
289 | schedule_delayed_work(&session->recovery_work, | |
290 | session->recovery_tmo * HZ); | |
291 | } | |
292 | EXPORT_SYMBOL_GPL(iscsi_block_session); | |
293 | ||
7b8631b5 MC |
294 | /** |
295 | * iscsi_create_session - create iscsi class session | |
296 | * @shost: scsi host | |
297 | * @transport: iscsi transport | |
298 | * | |
b5c7a12d | 299 | * This can be called from a LLD or iscsi_transport. |
7b8631b5 MC |
300 | **/ |
301 | struct iscsi_cls_session * | |
30a6c652 MC |
302 | iscsi_create_session(struct Scsi_Host *shost, |
303 | struct iscsi_transport *transport, int channel) | |
7b8631b5 | 304 | { |
30a6c652 | 305 | struct iscsi_host *ihost; |
7b8631b5 MC |
306 | struct iscsi_cls_session *session; |
307 | int err; | |
308 | ||
309 | if (!try_module_get(transport->owner)) | |
310 | return NULL; | |
311 | ||
b5c7a12d MC |
312 | session = kzalloc(sizeof(*session) + transport->sessiondata_size, |
313 | GFP_KERNEL); | |
7b8631b5 MC |
314 | if (!session) |
315 | goto module_put; | |
316 | session->transport = transport; | |
30a6c652 MC |
317 | session->recovery_tmo = 120; |
318 | INIT_WORK(&session->recovery_work, session_recovery_timedout, session); | |
319 | INIT_LIST_HEAD(&session->host_list); | |
320 | INIT_LIST_HEAD(&session->sess_list); | |
7b8631b5 | 321 | |
b5c7a12d MC |
322 | if (transport->sessiondata_size) |
323 | session->dd_data = &session[1]; | |
324 | ||
7b8631b5 MC |
325 | /* this is released in the dev's release function */ |
326 | scsi_host_get(shost); | |
30a6c652 MC |
327 | ihost = shost->shost_data; |
328 | ||
b5c7a12d | 329 | session->sid = iscsi_session_nr++; |
30a6c652 MC |
330 | session->channel = channel; |
331 | session->target_id = ihost->next_target_id++; | |
332 | ||
b5c7a12d MC |
333 | snprintf(session->dev.bus_id, BUS_ID_SIZE, "session%u", |
334 | session->sid); | |
7b8631b5 MC |
335 | session->dev.parent = &shost->shost_gendev; |
336 | session->dev.release = iscsi_session_release; | |
337 | err = device_register(&session->dev); | |
338 | if (err) { | |
339 | dev_printk(KERN_ERR, &session->dev, "iscsi: could not " | |
340 | "register session's dev\n"); | |
341 | goto free_session; | |
342 | } | |
343 | transport_register_device(&session->dev); | |
344 | ||
30a6c652 MC |
345 | mutex_lock(&ihost->mutex); |
346 | list_add(&session->host_list, &ihost->sessions); | |
347 | mutex_unlock(&ihost->mutex); | |
348 | ||
7b8631b5 MC |
349 | return session; |
350 | ||
351 | free_session: | |
352 | kfree(session); | |
353 | module_put: | |
354 | module_put(transport->owner); | |
355 | return NULL; | |
356 | } | |
357 | ||
358 | EXPORT_SYMBOL_GPL(iscsi_create_session); | |
359 | ||
360 | /** | |
361 | * iscsi_destroy_session - destroy iscsi session | |
362 | * @session: iscsi_session | |
363 | * | |
364 | * Can be called by a LLD or iscsi_transport. There must not be | |
365 | * any running connections. | |
366 | **/ | |
367 | int iscsi_destroy_session(struct iscsi_cls_session *session) | |
368 | { | |
30a6c652 MC |
369 | struct Scsi_Host *shost = iscsi_session_to_shost(session); |
370 | struct iscsi_host *ihost = shost->shost_data; | |
371 | ||
372 | if (!cancel_delayed_work(&session->recovery_work)) | |
373 | flush_scheduled_work(); | |
374 | ||
375 | mutex_lock(&ihost->mutex); | |
376 | list_del(&session->host_list); | |
377 | mutex_unlock(&ihost->mutex); | |
378 | ||
7b8631b5 MC |
379 | transport_unregister_device(&session->dev); |
380 | device_unregister(&session->dev); | |
381 | return 0; | |
382 | } | |
383 | ||
384 | EXPORT_SYMBOL_GPL(iscsi_destroy_session); | |
385 | ||
386 | static void iscsi_conn_release(struct device *dev) | |
387 | { | |
388 | struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev); | |
389 | struct device *parent = conn->dev.parent; | |
390 | ||
fd7255f5 | 391 | kfree(conn->persistent_address); |
7b8631b5 MC |
392 | kfree(conn); |
393 | put_device(parent); | |
394 | } | |
395 | ||
396 | static int iscsi_is_conn_dev(const struct device *dev) | |
397 | { | |
398 | return dev->release == iscsi_conn_release; | |
399 | } | |
400 | ||
401 | /** | |
402 | * iscsi_create_conn - create iscsi class connection | |
403 | * @session: iscsi cls session | |
404 | * @cid: connection id | |
405 | * | |
406 | * This can be called from a LLD or iscsi_transport. The connection | |
407 | * is child of the session so cid must be unique for all connections | |
408 | * on the session. | |
b5c7a12d MC |
409 | * |
410 | * Since we do not support MCS, cid will normally be zero. In some cases | |
411 | * for software iscsi we could be trying to preallocate a connection struct | |
412 | * in which case there could be two connection structs and cid would be | |
413 | * non-zero. | |
7b8631b5 MC |
414 | **/ |
415 | struct iscsi_cls_conn * | |
416 | iscsi_create_conn(struct iscsi_cls_session *session, uint32_t cid) | |
417 | { | |
418 | struct iscsi_transport *transport = session->transport; | |
7b8631b5 MC |
419 | struct iscsi_cls_conn *conn; |
420 | int err; | |
421 | ||
422 | conn = kzalloc(sizeof(*conn) + transport->conndata_size, GFP_KERNEL); | |
423 | if (!conn) | |
424 | return NULL; | |
425 | ||
426 | if (transport->conndata_size) | |
427 | conn->dd_data = &conn[1]; | |
428 | ||
429 | INIT_LIST_HEAD(&conn->conn_list); | |
430 | conn->transport = transport; | |
b5c7a12d | 431 | conn->cid = cid; |
7b8631b5 MC |
432 | |
433 | /* this is released in the dev's release function */ | |
434 | if (!get_device(&session->dev)) | |
435 | goto free_conn; | |
b5c7a12d | 436 | |
7b8631b5 | 437 | snprintf(conn->dev.bus_id, BUS_ID_SIZE, "connection%d:%u", |
b5c7a12d | 438 | session->sid, cid); |
7b8631b5 MC |
439 | conn->dev.parent = &session->dev; |
440 | conn->dev.release = iscsi_conn_release; | |
441 | err = device_register(&conn->dev); | |
442 | if (err) { | |
443 | dev_printk(KERN_ERR, &conn->dev, "iscsi: could not register " | |
444 | "connection's dev\n"); | |
445 | goto release_parent_ref; | |
446 | } | |
447 | transport_register_device(&conn->dev); | |
448 | return conn; | |
449 | ||
450 | release_parent_ref: | |
451 | put_device(&session->dev); | |
452 | free_conn: | |
453 | kfree(conn); | |
454 | return NULL; | |
455 | } | |
456 | ||
457 | EXPORT_SYMBOL_GPL(iscsi_create_conn); | |
458 | ||
459 | /** | |
460 | * iscsi_destroy_conn - destroy iscsi class connection | |
461 | * @session: iscsi cls session | |
462 | * | |
463 | * This can be called from a LLD or iscsi_transport. | |
464 | **/ | |
465 | int iscsi_destroy_conn(struct iscsi_cls_conn *conn) | |
466 | { | |
467 | transport_unregister_device(&conn->dev); | |
468 | device_unregister(&conn->dev); | |
469 | return 0; | |
470 | } | |
471 | ||
472 | EXPORT_SYMBOL_GPL(iscsi_destroy_conn); | |
473 | ||
7b8631b5 MC |
474 | /* |
475 | * iscsi interface functions | |
476 | */ | |
0896b752 AA |
477 | static struct iscsi_internal * |
478 | iscsi_if_transport_lookup(struct iscsi_transport *tt) | |
479 | { | |
480 | struct iscsi_internal *priv; | |
481 | unsigned long flags; | |
482 | ||
483 | spin_lock_irqsave(&iscsi_transport_lock, flags); | |
484 | list_for_each_entry(priv, &iscsi_transports, list) { | |
485 | if (tt == priv->iscsi_transport) { | |
486 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
487 | return priv; | |
488 | } | |
489 | } | |
490 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
491 | return NULL; | |
492 | } | |
1da177e4 | 493 | |
0896b752 AA |
494 | static inline struct list_head *skb_to_lh(struct sk_buff *skb) |
495 | { | |
496 | return (struct list_head *)&skb->cb; | |
497 | } | |
1da177e4 | 498 | |
0896b752 | 499 | static void* |
28e5554d | 500 | mempool_zone_alloc_skb(gfp_t gfp_mask, void *pool_data) |
0896b752 AA |
501 | { |
502 | struct mempool_zone *zone = pool_data; | |
1da177e4 | 503 | |
0896b752 | 504 | return alloc_skb(zone->size, gfp_mask); |
1da177e4 LT |
505 | } |
506 | ||
0896b752 AA |
507 | static void |
508 | mempool_zone_free_skb(void *element, void *pool_data) | |
509 | { | |
510 | kfree_skb(element); | |
511 | } | |
1da177e4 | 512 | |
0896b752 AA |
513 | static void |
514 | mempool_zone_complete(struct mempool_zone *zone) | |
515 | { | |
516 | unsigned long flags; | |
517 | struct list_head *lh, *n; | |
1da177e4 | 518 | |
0896b752 AA |
519 | spin_lock_irqsave(&zone->freelock, flags); |
520 | list_for_each_safe(lh, n, &zone->freequeue) { | |
521 | struct sk_buff *skb = (struct sk_buff *)((char *)lh - | |
522 | offsetof(struct sk_buff, cb)); | |
523 | if (!skb_shared(skb)) { | |
524 | list_del(skb_to_lh(skb)); | |
525 | mempool_free(skb, zone->pool); | |
526 | atomic_dec(&zone->allocated); | |
527 | } | |
528 | } | |
529 | spin_unlock_irqrestore(&zone->freelock, flags); | |
1da177e4 LT |
530 | } |
531 | ||
7b8631b5 MC |
532 | static struct mempool_zone * |
533 | mempool_zone_init(unsigned max, unsigned size, unsigned hiwat) | |
0896b752 | 534 | { |
7b8631b5 MC |
535 | struct mempool_zone *zp; |
536 | ||
537 | zp = kzalloc(sizeof(*zp), GFP_KERNEL); | |
538 | if (!zp) | |
539 | return NULL; | |
540 | ||
142e301f MC |
541 | zp->size = size; |
542 | zp->hiwat = hiwat; | |
543 | INIT_LIST_HEAD(&zp->freequeue); | |
544 | spin_lock_init(&zp->freelock); | |
545 | atomic_set(&zp->allocated, 0); | |
546 | ||
0896b752 AA |
547 | zp->pool = mempool_create(max, mempool_zone_alloc_skb, |
548 | mempool_zone_free_skb, zp); | |
7b8631b5 MC |
549 | if (!zp->pool) { |
550 | kfree(zp); | |
551 | return NULL; | |
552 | } | |
1da177e4 | 553 | |
7b8631b5 | 554 | return zp; |
0896b752 AA |
555 | } |
556 | ||
7b8631b5 MC |
557 | static void mempool_zone_destroy(struct mempool_zone *zp) |
558 | { | |
559 | mempool_destroy(zp->pool); | |
560 | kfree(zp); | |
561 | } | |
0896b752 AA |
562 | |
563 | static struct sk_buff* | |
564 | mempool_zone_get_skb(struct mempool_zone *zone) | |
1da177e4 | 565 | { |
0896b752 AA |
566 | struct sk_buff *skb; |
567 | ||
568 | skb = mempool_alloc(zone->pool, GFP_ATOMIC); | |
569 | if (skb) | |
570 | atomic_inc(&zone->allocated); | |
571 | return skb; | |
572 | } | |
1da177e4 | 573 | |
0896b752 | 574 | static int |
790f39a2 | 575 | iscsi_unicast_skb(struct mempool_zone *zone, struct sk_buff *skb, int pid) |
0896b752 AA |
576 | { |
577 | unsigned long flags; | |
578 | int rc; | |
1da177e4 | 579 | |
0896b752 | 580 | skb_get(skb); |
790f39a2 | 581 | rc = netlink_unicast(nls, skb, pid, MSG_DONTWAIT); |
0896b752 AA |
582 | if (rc < 0) { |
583 | mempool_free(skb, zone->pool); | |
584 | printk(KERN_ERR "iscsi: can not unicast skb (%d)\n", rc); | |
585 | return rc; | |
586 | } | |
587 | ||
588 | spin_lock_irqsave(&zone->freelock, flags); | |
30a6c652 | 589 | INIT_LIST_HEAD(skb_to_lh(skb)); |
0896b752 AA |
590 | list_add(skb_to_lh(skb), &zone->freequeue); |
591 | spin_unlock_irqrestore(&zone->freelock, flags); | |
592 | ||
593 | return 0; | |
1da177e4 | 594 | } |
1da177e4 | 595 | |
7b7232f3 | 596 | int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr, |
0896b752 | 597 | char *data, uint32_t data_size) |
1da177e4 | 598 | { |
0896b752 AA |
599 | struct nlmsghdr *nlh; |
600 | struct sk_buff *skb; | |
601 | struct iscsi_uevent *ev; | |
0896b752 | 602 | char *pdu; |
790f39a2 | 603 | struct iscsi_internal *priv; |
0896b752 AA |
604 | int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) + |
605 | data_size); | |
606 | ||
790f39a2 MC |
607 | priv = iscsi_if_transport_lookup(conn->transport); |
608 | if (!priv) | |
609 | return -EINVAL; | |
610 | ||
7b8631b5 | 611 | mempool_zone_complete(conn->z_pdu); |
0896b752 | 612 | |
7b8631b5 | 613 | skb = mempool_zone_get_skb(conn->z_pdu); |
0896b752 | 614 | if (!skb) { |
7b7232f3 | 615 | iscsi_conn_error(conn, ISCSI_ERR_CONN_FAILED); |
7b8631b5 MC |
616 | dev_printk(KERN_ERR, &conn->dev, "iscsi: can not deliver " |
617 | "control PDU: OOM\n"); | |
0896b752 AA |
618 | return -ENOMEM; |
619 | } | |
1da177e4 | 620 | |
790f39a2 | 621 | nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0); |
0896b752 AA |
622 | ev = NLMSG_DATA(nlh); |
623 | memset(ev, 0, sizeof(*ev)); | |
624 | ev->transport_handle = iscsi_handle(conn->transport); | |
625 | ev->type = ISCSI_KEVENT_RECV_PDU; | |
7b8631b5 | 626 | if (atomic_read(&conn->z_pdu->allocated) >= conn->z_pdu->hiwat) |
0896b752 | 627 | ev->iferror = -ENOMEM; |
b5c7a12d MC |
628 | ev->r.recv_req.cid = conn->cid; |
629 | ev->r.recv_req.sid = iscsi_conn_get_sid(conn); | |
0896b752 AA |
630 | pdu = (char*)ev + sizeof(*ev); |
631 | memcpy(pdu, hdr, sizeof(struct iscsi_hdr)); | |
632 | memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size); | |
1da177e4 | 633 | |
790f39a2 | 634 | return iscsi_unicast_skb(conn->z_pdu, skb, priv->daemon_pid); |
1da177e4 | 635 | } |
0896b752 | 636 | EXPORT_SYMBOL_GPL(iscsi_recv_pdu); |
1da177e4 | 637 | |
7b7232f3 | 638 | void iscsi_conn_error(struct iscsi_cls_conn *conn, enum iscsi_err error) |
1da177e4 | 639 | { |
0896b752 AA |
640 | struct nlmsghdr *nlh; |
641 | struct sk_buff *skb; | |
642 | struct iscsi_uevent *ev; | |
790f39a2 | 643 | struct iscsi_internal *priv; |
0896b752 AA |
644 | int len = NLMSG_SPACE(sizeof(*ev)); |
645 | ||
790f39a2 MC |
646 | priv = iscsi_if_transport_lookup(conn->transport); |
647 | if (!priv) | |
648 | return; | |
649 | ||
7b8631b5 | 650 | mempool_zone_complete(conn->z_error); |
0896b752 | 651 | |
7b8631b5 | 652 | skb = mempool_zone_get_skb(conn->z_error); |
0896b752 | 653 | if (!skb) { |
7b8631b5 MC |
654 | dev_printk(KERN_ERR, &conn->dev, "iscsi: gracefully ignored " |
655 | "conn error (%d)\n", error); | |
0896b752 AA |
656 | return; |
657 | } | |
658 | ||
790f39a2 | 659 | nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0); |
0896b752 AA |
660 | ev = NLMSG_DATA(nlh); |
661 | ev->transport_handle = iscsi_handle(conn->transport); | |
662 | ev->type = ISCSI_KEVENT_CONN_ERROR; | |
7b8631b5 | 663 | if (atomic_read(&conn->z_error->allocated) >= conn->z_error->hiwat) |
0896b752 AA |
664 | ev->iferror = -ENOMEM; |
665 | ev->r.connerror.error = error; | |
b5c7a12d MC |
666 | ev->r.connerror.cid = conn->cid; |
667 | ev->r.connerror.sid = iscsi_conn_get_sid(conn); | |
1da177e4 | 668 | |
790f39a2 | 669 | iscsi_unicast_skb(conn->z_error, skb, priv->daemon_pid); |
1da177e4 | 670 | |
7b8631b5 MC |
671 | dev_printk(KERN_INFO, &conn->dev, "iscsi: detected conn error (%d)\n", |
672 | error); | |
0896b752 AA |
673 | } |
674 | EXPORT_SYMBOL_GPL(iscsi_conn_error); | |
675 | ||
676 | static int | |
677 | iscsi_if_send_reply(int pid, int seq, int type, int done, int multi, | |
678 | void *payload, int size) | |
679 | { | |
680 | struct sk_buff *skb; | |
681 | struct nlmsghdr *nlh; | |
682 | int len = NLMSG_SPACE(size); | |
683 | int flags = multi ? NLM_F_MULTI : 0; | |
684 | int t = done ? NLMSG_DONE : type; | |
685 | ||
7b8631b5 | 686 | mempool_zone_complete(z_reply); |
0896b752 | 687 | |
7b8631b5 | 688 | skb = mempool_zone_get_skb(z_reply); |
0896b752 AA |
689 | /* |
690 | * FIXME: | |
691 | * user is supposed to react on iferror == -ENOMEM; | |
692 | * see iscsi_if_rx(). | |
693 | */ | |
694 | BUG_ON(!skb); | |
695 | ||
696 | nlh = __nlmsg_put(skb, pid, seq, t, (len - sizeof(*nlh)), 0); | |
697 | nlh->nlmsg_flags = flags; | |
698 | memcpy(NLMSG_DATA(nlh), payload, size); | |
790f39a2 | 699 | return iscsi_unicast_skb(z_reply, skb, pid); |
1da177e4 | 700 | } |
1da177e4 | 701 | |
7b8631b5 | 702 | static int |
5b940adf | 703 | iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh) |
7b8631b5 MC |
704 | { |
705 | struct iscsi_uevent *ev = NLMSG_DATA(nlh); | |
706 | struct iscsi_stats *stats; | |
707 | struct sk_buff *skbstat; | |
708 | struct iscsi_cls_conn *conn; | |
709 | struct nlmsghdr *nlhstat; | |
710 | struct iscsi_uevent *evstat; | |
790f39a2 | 711 | struct iscsi_internal *priv; |
7b8631b5 MC |
712 | int len = NLMSG_SPACE(sizeof(*ev) + |
713 | sizeof(struct iscsi_stats) + | |
714 | sizeof(struct iscsi_stats_custom) * | |
715 | ISCSI_STATS_CUSTOM_MAX); | |
716 | int err = 0; | |
0896b752 | 717 | |
790f39a2 MC |
718 | priv = iscsi_if_transport_lookup(transport); |
719 | if (!priv) | |
720 | return -EINVAL; | |
721 | ||
b5c7a12d | 722 | conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid); |
7b8631b5 MC |
723 | if (!conn) |
724 | return -EEXIST; | |
0896b752 | 725 | |
7b8631b5 MC |
726 | do { |
727 | int actual_size; | |
0896b752 | 728 | |
7b8631b5 | 729 | mempool_zone_complete(conn->z_pdu); |
0896b752 | 730 | |
7b8631b5 MC |
731 | skbstat = mempool_zone_get_skb(conn->z_pdu); |
732 | if (!skbstat) { | |
733 | dev_printk(KERN_ERR, &conn->dev, "iscsi: can not " | |
734 | "deliver stats: OOM\n"); | |
735 | return -ENOMEM; | |
736 | } | |
737 | ||
790f39a2 | 738 | nlhstat = __nlmsg_put(skbstat, priv->daemon_pid, 0, 0, |
7b8631b5 MC |
739 | (len - sizeof(*nlhstat)), 0); |
740 | evstat = NLMSG_DATA(nlhstat); | |
741 | memset(evstat, 0, sizeof(*evstat)); | |
742 | evstat->transport_handle = iscsi_handle(conn->transport); | |
743 | evstat->type = nlh->nlmsg_type; | |
744 | if (atomic_read(&conn->z_pdu->allocated) >= conn->z_pdu->hiwat) | |
745 | evstat->iferror = -ENOMEM; | |
b5c7a12d MC |
746 | evstat->u.get_stats.cid = |
747 | ev->u.get_stats.cid; | |
748 | evstat->u.get_stats.sid = | |
749 | ev->u.get_stats.sid; | |
7b8631b5 MC |
750 | stats = (struct iscsi_stats *) |
751 | ((char*)evstat + sizeof(*evstat)); | |
752 | memset(stats, 0, sizeof(*stats)); | |
753 | ||
7b7232f3 | 754 | transport->get_stats(conn, stats); |
7b8631b5 MC |
755 | actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) + |
756 | sizeof(struct iscsi_stats) + | |
757 | sizeof(struct iscsi_stats_custom) * | |
758 | stats->custom_length); | |
759 | actual_size -= sizeof(*nlhstat); | |
760 | actual_size = NLMSG_LENGTH(actual_size); | |
5b940adf | 761 | skb_trim(skbstat, NLMSG_ALIGN(actual_size)); |
7b8631b5 MC |
762 | nlhstat->nlmsg_len = actual_size; |
763 | ||
790f39a2 | 764 | err = iscsi_unicast_skb(conn->z_pdu, skbstat, priv->daemon_pid); |
7b8631b5 MC |
765 | } while (err < 0 && err != -ECONNREFUSED); |
766 | ||
767 | return err; | |
0896b752 AA |
768 | } |
769 | ||
770 | static int | |
771 | iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_uevent *ev) | |
772 | { | |
773 | struct iscsi_transport *transport = priv->iscsi_transport; | |
7b7232f3 | 774 | struct iscsi_cls_session *session; |
7996a778 | 775 | unsigned long flags; |
b5c7a12d | 776 | uint32_t hostno; |
0896b752 | 777 | |
7996a778 | 778 | session = transport->create_session(transport, &priv->t, |
7b7232f3 | 779 | ev->u.c_session.initial_cmdsn, |
b5c7a12d | 780 | &hostno); |
7b7232f3 | 781 | if (!session) |
7b8631b5 | 782 | return -ENOMEM; |
0896b752 | 783 | |
7996a778 MC |
784 | spin_lock_irqsave(&sesslock, flags); |
785 | list_add(&session->sess_list, &sesslist); | |
786 | spin_unlock_irqrestore(&sesslock, flags); | |
787 | ||
b5c7a12d MC |
788 | ev->r.c_session_ret.host_no = hostno; |
789 | ev->r.c_session_ret.sid = session->sid; | |
0896b752 | 790 | return 0; |
0896b752 AA |
791 | } |
792 | ||
793 | static int | |
7b7232f3 | 794 | iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev) |
0896b752 | 795 | { |
7b8631b5 | 796 | struct iscsi_cls_conn *conn; |
7b7232f3 | 797 | struct iscsi_cls_session *session; |
0896b752 | 798 | unsigned long flags; |
7b8631b5 | 799 | |
b5c7a12d MC |
800 | session = iscsi_session_lookup(ev->u.c_conn.sid); |
801 | if (!session) { | |
802 | printk(KERN_ERR "iscsi: invalid session %d\n", | |
803 | ev->u.c_conn.sid); | |
7b8631b5 | 804 | return -EINVAL; |
b5c7a12d | 805 | } |
0896b752 | 806 | |
7b7232f3 | 807 | conn = transport->create_conn(session, ev->u.c_conn.cid); |
b5c7a12d MC |
808 | if (!conn) { |
809 | printk(KERN_ERR "iscsi: couldn't create a new " | |
810 | "connection for session %d\n", | |
811 | session->sid); | |
7b7232f3 | 812 | return -ENOMEM; |
b5c7a12d | 813 | } |
0896b752 | 814 | |
7b8631b5 | 815 | conn->z_pdu = mempool_zone_init(Z_MAX_PDU, |
0896b752 AA |
816 | NLMSG_SPACE(sizeof(struct iscsi_uevent) + |
817 | sizeof(struct iscsi_hdr) + | |
818 | DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH), | |
819 | Z_HIWAT_PDU); | |
7b8631b5 MC |
820 | if (!conn->z_pdu) { |
821 | dev_printk(KERN_ERR, &conn->dev, "iscsi: can not allocate " | |
822 | "pdu zone for new conn\n"); | |
823 | goto destroy_conn; | |
0896b752 | 824 | } |
7b8631b5 MC |
825 | |
826 | conn->z_error = mempool_zone_init(Z_MAX_ERROR, | |
0896b752 AA |
827 | NLMSG_SPACE(sizeof(struct iscsi_uevent)), |
828 | Z_HIWAT_ERROR); | |
7b8631b5 MC |
829 | if (!conn->z_error) { |
830 | dev_printk(KERN_ERR, &conn->dev, "iscsi: can not allocate " | |
831 | "error zone for new conn\n"); | |
832 | goto free_pdu_pool; | |
0896b752 AA |
833 | } |
834 | ||
b5c7a12d MC |
835 | ev->r.c_conn_ret.sid = session->sid; |
836 | ev->r.c_conn_ret.cid = conn->cid; | |
0896b752 AA |
837 | |
838 | spin_lock_irqsave(&connlock, flags); | |
839 | list_add(&conn->conn_list, &connlist); | |
0896b752 AA |
840 | conn->active = 1; |
841 | spin_unlock_irqrestore(&connlock, flags); | |
842 | ||
0896b752 AA |
843 | return 0; |
844 | ||
7b8631b5 MC |
845 | free_pdu_pool: |
846 | mempool_zone_destroy(conn->z_pdu); | |
847 | destroy_conn: | |
848 | if (transport->destroy_conn) | |
849 | transport->destroy_conn(conn->dd_data); | |
7b8631b5 | 850 | return -ENOMEM; |
1da177e4 LT |
851 | } |
852 | ||
0896b752 AA |
853 | static int |
854 | iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev) | |
855 | { | |
856 | unsigned long flags; | |
7b8631b5 MC |
857 | struct iscsi_cls_conn *conn; |
858 | struct mempool_zone *z_error, *z_pdu; | |
0896b752 | 859 | |
b5c7a12d | 860 | conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid); |
0896b752 | 861 | if (!conn) |
7b8631b5 | 862 | return -EINVAL; |
0896b752 AA |
863 | spin_lock_irqsave(&connlock, flags); |
864 | conn->active = 0; | |
865 | list_del(&conn->conn_list); | |
866 | spin_unlock_irqrestore(&connlock, flags); | |
867 | ||
7b8631b5 MC |
868 | z_pdu = conn->z_pdu; |
869 | z_error = conn->z_error; | |
0896b752 | 870 | |
7b8631b5 MC |
871 | if (transport->destroy_conn) |
872 | transport->destroy_conn(conn); | |
0896b752 | 873 | |
7b8631b5 MC |
874 | mempool_zone_destroy(z_pdu); |
875 | mempool_zone_destroy(z_error); | |
0896b752 | 876 | |
7b8631b5 | 877 | return 0; |
0896b752 AA |
878 | } |
879 | ||
fd7255f5 MC |
880 | static void |
881 | iscsi_copy_param(struct iscsi_uevent *ev, uint32_t *value, char *data) | |
882 | { | |
883 | if (ev->u.set_param.len != sizeof(uint32_t)) | |
884 | BUG(); | |
885 | memcpy(value, data, min_t(uint32_t, sizeof(uint32_t), | |
886 | ev->u.set_param.len)); | |
887 | } | |
888 | ||
889 | static int | |
890 | iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev) | |
891 | { | |
892 | char *data = (char*)ev + sizeof(*ev); | |
893 | struct iscsi_cls_conn *conn; | |
894 | struct iscsi_cls_session *session; | |
895 | int err = 0; | |
896 | uint32_t value = 0; | |
897 | ||
898 | session = iscsi_session_lookup(ev->u.set_param.sid); | |
899 | conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid); | |
900 | if (!conn || !session) | |
901 | return -EINVAL; | |
902 | ||
903 | switch (ev->u.set_param.param) { | |
30a6c652 MC |
904 | case ISCSI_PARAM_SESS_RECOVERY_TMO: |
905 | iscsi_copy_param(ev, &value, data); | |
906 | if (value != 0) | |
907 | session->recovery_tmo = value; | |
908 | break; | |
fd7255f5 MC |
909 | case ISCSI_PARAM_TARGET_NAME: |
910 | /* this should not change between logins */ | |
911 | if (session->targetname) | |
912 | return 0; | |
913 | ||
914 | session->targetname = kstrdup(data, GFP_KERNEL); | |
915 | if (!session->targetname) | |
916 | return -ENOMEM; | |
917 | break; | |
918 | case ISCSI_PARAM_TPGT: | |
919 | iscsi_copy_param(ev, &value, data); | |
920 | session->tpgt = value; | |
921 | break; | |
922 | case ISCSI_PARAM_PERSISTENT_PORT: | |
923 | iscsi_copy_param(ev, &value, data); | |
924 | conn->persistent_port = value; | |
925 | break; | |
926 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
927 | /* | |
928 | * this is the address returned in discovery so it should | |
929 | * not change between logins. | |
930 | */ | |
931 | if (conn->persistent_address) | |
932 | return 0; | |
933 | ||
934 | conn->persistent_address = kstrdup(data, GFP_KERNEL); | |
935 | if (!conn->persistent_address) | |
936 | return -ENOMEM; | |
937 | break; | |
938 | default: | |
939 | iscsi_copy_param(ev, &value, data); | |
940 | err = transport->set_param(conn, ev->u.set_param.param, value); | |
941 | } | |
942 | ||
943 | return err; | |
944 | } | |
945 | ||
264faaaa OG |
946 | static int |
947 | iscsi_if_transport_ep(struct iscsi_transport *transport, | |
948 | struct iscsi_uevent *ev, int msg_type) | |
949 | { | |
950 | struct sockaddr *dst_addr; | |
951 | int rc = 0; | |
952 | ||
953 | switch (msg_type) { | |
954 | case ISCSI_UEVENT_TRANSPORT_EP_CONNECT: | |
955 | if (!transport->ep_connect) | |
956 | return -EINVAL; | |
957 | ||
958 | dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev)); | |
959 | rc = transport->ep_connect(dst_addr, | |
960 | ev->u.ep_connect.non_blocking, | |
961 | &ev->r.ep_connect_ret.handle); | |
962 | break; | |
963 | case ISCSI_UEVENT_TRANSPORT_EP_POLL: | |
964 | if (!transport->ep_poll) | |
965 | return -EINVAL; | |
966 | ||
967 | ev->r.retcode = transport->ep_poll(ev->u.ep_poll.ep_handle, | |
968 | ev->u.ep_poll.timeout_ms); | |
969 | break; | |
970 | case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT: | |
971 | if (!transport->ep_disconnect) | |
972 | return -EINVAL; | |
973 | ||
974 | transport->ep_disconnect(ev->u.ep_disconnect.ep_handle); | |
975 | break; | |
976 | } | |
977 | return rc; | |
978 | } | |
979 | ||
01cb225d MC |
980 | static int |
981 | iscsi_tgt_dscvr(struct iscsi_transport *transport, | |
982 | struct iscsi_uevent *ev) | |
983 | { | |
984 | struct sockaddr *dst_addr; | |
985 | ||
986 | if (!transport->tgt_dscvr) | |
987 | return -EINVAL; | |
988 | ||
989 | dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev)); | |
990 | return transport->tgt_dscvr(ev->u.tgt_dscvr.type, | |
991 | ev->u.tgt_dscvr.host_no, | |
992 | ev->u.tgt_dscvr.enable, dst_addr); | |
993 | } | |
994 | ||
0896b752 AA |
995 | static int |
996 | iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) | |
997 | { | |
998 | int err = 0; | |
999 | struct iscsi_uevent *ev = NLMSG_DATA(nlh); | |
1000 | struct iscsi_transport *transport = NULL; | |
1001 | struct iscsi_internal *priv; | |
7b7232f3 MC |
1002 | struct iscsi_cls_session *session; |
1003 | struct iscsi_cls_conn *conn; | |
7996a778 | 1004 | unsigned long flags; |
0896b752 | 1005 | |
0896b752 AA |
1006 | priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle)); |
1007 | if (!priv) | |
1008 | return -EINVAL; | |
1009 | transport = priv->iscsi_transport; | |
1010 | ||
7b7232f3 MC |
1011 | if (!try_module_get(transport->owner)) |
1012 | return -EINVAL; | |
1013 | ||
790f39a2 MC |
1014 | priv->daemon_pid = NETLINK_CREDS(skb)->pid; |
1015 | ||
0896b752 AA |
1016 | switch (nlh->nlmsg_type) { |
1017 | case ISCSI_UEVENT_CREATE_SESSION: | |
1018 | err = iscsi_if_create_session(priv, ev); | |
1019 | break; | |
1020 | case ISCSI_UEVENT_DESTROY_SESSION: | |
b5c7a12d | 1021 | session = iscsi_session_lookup(ev->u.d_session.sid); |
7996a778 MC |
1022 | if (session) { |
1023 | spin_lock_irqsave(&sesslock, flags); | |
1024 | list_del(&session->sess_list); | |
1025 | spin_unlock_irqrestore(&sesslock, flags); | |
1026 | ||
7b7232f3 | 1027 | transport->destroy_session(session); |
7996a778 | 1028 | } else |
7b7232f3 | 1029 | err = -EINVAL; |
0896b752 AA |
1030 | break; |
1031 | case ISCSI_UEVENT_CREATE_CONN: | |
1032 | err = iscsi_if_create_conn(transport, ev); | |
1033 | break; | |
1034 | case ISCSI_UEVENT_DESTROY_CONN: | |
1035 | err = iscsi_if_destroy_conn(transport, ev); | |
1036 | break; | |
1037 | case ISCSI_UEVENT_BIND_CONN: | |
b5c7a12d MC |
1038 | session = iscsi_session_lookup(ev->u.b_conn.sid); |
1039 | conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid); | |
7b7232f3 MC |
1040 | |
1041 | if (session && conn) | |
1042 | ev->r.retcode = transport->bind_conn(session, conn, | |
264faaaa | 1043 | ev->u.b_conn.transport_eph, |
7b7232f3 MC |
1044 | ev->u.b_conn.is_leading); |
1045 | else | |
1046 | err = -EINVAL; | |
0896b752 AA |
1047 | break; |
1048 | case ISCSI_UEVENT_SET_PARAM: | |
fd7255f5 | 1049 | err = iscsi_set_param(transport, ev); |
0896b752 AA |
1050 | break; |
1051 | case ISCSI_UEVENT_START_CONN: | |
b5c7a12d | 1052 | conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid); |
7b7232f3 MC |
1053 | if (conn) |
1054 | ev->r.retcode = transport->start_conn(conn); | |
1055 | else | |
1056 | err = -EINVAL; | |
0896b752 AA |
1057 | break; |
1058 | case ISCSI_UEVENT_STOP_CONN: | |
b5c7a12d | 1059 | conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid); |
7b7232f3 MC |
1060 | if (conn) |
1061 | transport->stop_conn(conn, ev->u.stop_conn.flag); | |
1062 | else | |
1063 | err = -EINVAL; | |
0896b752 AA |
1064 | break; |
1065 | case ISCSI_UEVENT_SEND_PDU: | |
b5c7a12d | 1066 | conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid); |
7b7232f3 MC |
1067 | if (conn) |
1068 | ev->r.retcode = transport->send_pdu(conn, | |
1069 | (struct iscsi_hdr*)((char*)ev + sizeof(*ev)), | |
1070 | (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size, | |
1071 | ev->u.send_pdu.data_size); | |
1072 | else | |
1073 | err = -EINVAL; | |
0896b752 AA |
1074 | break; |
1075 | case ISCSI_UEVENT_GET_STATS: | |
5b940adf | 1076 | err = iscsi_if_get_stats(transport, nlh); |
0896b752 | 1077 | break; |
264faaaa OG |
1078 | case ISCSI_UEVENT_TRANSPORT_EP_CONNECT: |
1079 | case ISCSI_UEVENT_TRANSPORT_EP_POLL: | |
1080 | case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT: | |
1081 | err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type); | |
1082 | break; | |
01cb225d MC |
1083 | case ISCSI_UEVENT_TGT_DSCVR: |
1084 | err = iscsi_tgt_dscvr(transport, ev); | |
1085 | break; | |
0896b752 AA |
1086 | default: |
1087 | err = -EINVAL; | |
1088 | break; | |
1089 | } | |
1090 | ||
7b7232f3 | 1091 | module_put(transport->owner); |
0896b752 AA |
1092 | return err; |
1093 | } | |
1094 | ||
b5c7a12d MC |
1095 | /* |
1096 | * Get message from skb (based on rtnetlink_rcv_skb). Each message is | |
1097 | * processed by iscsi_if_recv_msg. Malformed skbs with wrong lengths or | |
1098 | * invalid creds are discarded silently. | |
1099 | */ | |
0896b752 AA |
1100 | static void |
1101 | iscsi_if_rx(struct sock *sk, int len) | |
1102 | { | |
1103 | struct sk_buff *skb; | |
1da177e4 | 1104 | |
0b950672 | 1105 | mutex_lock(&rx_queue_mutex); |
0896b752 | 1106 | while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { |
ee7f8e40 MC |
1107 | if (NETLINK_CREDS(skb)->uid) { |
1108 | skb_pull(skb, skb->len); | |
1109 | goto free_skb; | |
1110 | } | |
ee7f8e40 | 1111 | |
0896b752 AA |
1112 | while (skb->len >= NLMSG_SPACE(0)) { |
1113 | int err; | |
1114 | uint32_t rlen; | |
1115 | struct nlmsghdr *nlh; | |
1116 | struct iscsi_uevent *ev; | |
1117 | ||
1118 | nlh = (struct nlmsghdr *)skb->data; | |
1119 | if (nlh->nlmsg_len < sizeof(*nlh) || | |
1120 | skb->len < nlh->nlmsg_len) { | |
1121 | break; | |
1122 | } | |
ee7f8e40 | 1123 | |
0896b752 AA |
1124 | ev = NLMSG_DATA(nlh); |
1125 | rlen = NLMSG_ALIGN(nlh->nlmsg_len); | |
1126 | if (rlen > skb->len) | |
1127 | rlen = skb->len; | |
ee7f8e40 | 1128 | |
0896b752 AA |
1129 | err = iscsi_if_recv_msg(skb, nlh); |
1130 | if (err) { | |
1131 | ev->type = ISCSI_KEVENT_IF_ERROR; | |
1132 | ev->iferror = err; | |
1133 | } | |
1134 | do { | |
1135 | /* | |
1136 | * special case for GET_STATS: | |
1137 | * on success - sending reply and stats from | |
1138 | * inside of if_recv_msg(), | |
1139 | * on error - fall through. | |
1140 | */ | |
1141 | if (ev->type == ISCSI_UEVENT_GET_STATS && !err) | |
1142 | break; | |
1143 | err = iscsi_if_send_reply( | |
1144 | NETLINK_CREDS(skb)->pid, nlh->nlmsg_seq, | |
1145 | nlh->nlmsg_type, 0, 0, ev, sizeof(*ev)); | |
7b8631b5 MC |
1146 | if (atomic_read(&z_reply->allocated) >= |
1147 | z_reply->hiwat) | |
0896b752 AA |
1148 | ev->iferror = -ENOMEM; |
1149 | } while (err < 0 && err != -ECONNREFUSED); | |
1150 | skb_pull(skb, rlen); | |
1151 | } | |
ee7f8e40 | 1152 | free_skb: |
0896b752 AA |
1153 | kfree_skb(skb); |
1154 | } | |
0b950672 | 1155 | mutex_unlock(&rx_queue_mutex); |
0896b752 | 1156 | } |
1da177e4 | 1157 | |
7b8631b5 MC |
1158 | #define iscsi_cdev_to_conn(_cdev) \ |
1159 | iscsi_dev_to_conn(_cdev->dev) | |
1160 | ||
fd7255f5 MC |
1161 | #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \ |
1162 | struct class_device_attribute class_device_attr_##_prefix##_##_name = \ | |
1163 | __ATTR(_name,_mode,_show,_store) | |
1164 | ||
1da177e4 | 1165 | /* |
0896b752 | 1166 | * iSCSI connection attrs |
1da177e4 | 1167 | */ |
0896b752 AA |
1168 | #define iscsi_conn_int_attr_show(param, format) \ |
1169 | static ssize_t \ | |
1170 | show_conn_int_param_##param(struct class_device *cdev, char *buf) \ | |
1171 | { \ | |
1172 | uint32_t value = 0; \ | |
7b8631b5 MC |
1173 | struct iscsi_cls_conn *conn = iscsi_cdev_to_conn(cdev); \ |
1174 | struct iscsi_transport *t = conn->transport; \ | |
0896b752 | 1175 | \ |
7b7232f3 | 1176 | t->get_conn_param(conn, param, &value); \ |
0896b752 AA |
1177 | return snprintf(buf, 20, format"\n", value); \ |
1178 | } | |
1179 | ||
1180 | #define iscsi_conn_int_attr(field, param, format) \ | |
1181 | iscsi_conn_int_attr_show(param, format) \ | |
fd7255f5 MC |
1182 | static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_int_param_##param, \ |
1183 | NULL); | |
0896b752 AA |
1184 | |
1185 | iscsi_conn_int_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH, "%u"); | |
1186 | iscsi_conn_int_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH, "%u"); | |
1187 | iscsi_conn_int_attr(header_digest, ISCSI_PARAM_HDRDGST_EN, "%d"); | |
1188 | iscsi_conn_int_attr(data_digest, ISCSI_PARAM_DATADGST_EN, "%d"); | |
1189 | iscsi_conn_int_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN, "%d"); | |
1190 | iscsi_conn_int_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN, "%d"); | |
fd7255f5 MC |
1191 | iscsi_conn_int_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT, "%d"); |
1192 | iscsi_conn_int_attr(port, ISCSI_PARAM_CONN_PORT, "%d"); | |
8d2860b3 | 1193 | iscsi_conn_int_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN, "%u"); |
fd7255f5 MC |
1194 | |
1195 | #define iscsi_conn_str_attr_show(param) \ | |
1196 | static ssize_t \ | |
1197 | show_conn_str_param_##param(struct class_device *cdev, char *buf) \ | |
1198 | { \ | |
1199 | struct iscsi_cls_conn *conn = iscsi_cdev_to_conn(cdev); \ | |
1200 | struct iscsi_transport *t = conn->transport; \ | |
1201 | return t->get_conn_str_param(conn, param, buf); \ | |
1202 | } | |
1203 | ||
1204 | #define iscsi_conn_str_attr(field, param) \ | |
1205 | iscsi_conn_str_attr_show(param) \ | |
1206 | static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_str_param_##param, \ | |
1207 | NULL); | |
1208 | ||
1209 | iscsi_conn_str_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS); | |
1210 | iscsi_conn_str_attr(address, ISCSI_PARAM_CONN_ADDRESS); | |
1da177e4 | 1211 | |
7b8631b5 MC |
1212 | #define iscsi_cdev_to_session(_cdev) \ |
1213 | iscsi_dev_to_session(_cdev->dev) | |
1214 | ||
1da177e4 | 1215 | /* |
0896b752 | 1216 | * iSCSI session attrs |
1da177e4 | 1217 | */ |
0896b752 | 1218 | #define iscsi_session_int_attr_show(param, format) \ |
1da177e4 | 1219 | static ssize_t \ |
0896b752 | 1220 | show_session_int_param_##param(struct class_device *cdev, char *buf) \ |
1da177e4 | 1221 | { \ |
0896b752 | 1222 | uint32_t value = 0; \ |
7b8631b5 | 1223 | struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev); \ |
7b8631b5 | 1224 | struct iscsi_transport *t = session->transport; \ |
1da177e4 | 1225 | \ |
7b7232f3 | 1226 | t->get_session_param(session, param, &value); \ |
0896b752 | 1227 | return snprintf(buf, 20, format"\n", value); \ |
1da177e4 LT |
1228 | } |
1229 | ||
0896b752 AA |
1230 | #define iscsi_session_int_attr(field, param, format) \ |
1231 | iscsi_session_int_attr_show(param, format) \ | |
fd7255f5 MC |
1232 | static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_int_param_##param, \ |
1233 | NULL); | |
1da177e4 | 1234 | |
0896b752 AA |
1235 | iscsi_session_int_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, "%d"); |
1236 | iscsi_session_int_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, "%hu"); | |
1237 | iscsi_session_int_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, "%d"); | |
1238 | iscsi_session_int_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, "%u"); | |
1239 | iscsi_session_int_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, "%u"); | |
1240 | iscsi_session_int_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, "%d"); | |
1241 | iscsi_session_int_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, "%d"); | |
1242 | iscsi_session_int_attr(erl, ISCSI_PARAM_ERL, "%d"); | |
fd7255f5 | 1243 | iscsi_session_int_attr(tpgt, ISCSI_PARAM_TPGT, "%d"); |
1da177e4 | 1244 | |
fd7255f5 MC |
1245 | #define iscsi_session_str_attr_show(param) \ |
1246 | static ssize_t \ | |
1247 | show_session_str_param_##param(struct class_device *cdev, char *buf) \ | |
1248 | { \ | |
1249 | struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev); \ | |
1250 | struct iscsi_transport *t = session->transport; \ | |
1251 | return t->get_session_str_param(session, param, buf); \ | |
1252 | } | |
1253 | ||
1254 | #define iscsi_session_str_attr(field, param) \ | |
1255 | iscsi_session_str_attr_show(param) \ | |
1256 | static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_str_param_##param, \ | |
1257 | NULL); | |
1258 | ||
1259 | iscsi_session_str_attr(targetname, ISCSI_PARAM_TARGET_NAME); | |
1da177e4 | 1260 | |
fd7255f5 MC |
1261 | /* |
1262 | * Private session and conn attrs. userspace uses several iscsi values | |
1263 | * to identify each session between reboots. Some of these values may not | |
1264 | * be present in the iscsi_transport/LLD driver becuase userspace handles | |
1265 | * login (and failback for login redirect) so for these type of drivers | |
1266 | * the class manages the attrs and values for the iscsi_transport/LLD | |
1267 | */ | |
1268 | #define iscsi_priv_session_attr_show(field, format) \ | |
1269 | static ssize_t \ | |
1270 | show_priv_session_##field(struct class_device *cdev, char *buf) \ | |
1271 | { \ | |
1272 | struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev); \ | |
1273 | return sprintf(buf, format"\n", session->field); \ | |
1274 | } | |
1275 | ||
1276 | #define iscsi_priv_session_attr(field, format) \ | |
1277 | iscsi_priv_session_attr_show(field, format) \ | |
1278 | static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO, show_priv_session_##field, \ | |
1279 | NULL) | |
1280 | iscsi_priv_session_attr(targetname, "%s"); | |
1281 | iscsi_priv_session_attr(tpgt, "%d"); | |
30a6c652 | 1282 | iscsi_priv_session_attr(recovery_tmo, "%d"); |
fd7255f5 MC |
1283 | |
1284 | #define iscsi_priv_conn_attr_show(field, format) \ | |
1285 | static ssize_t \ | |
1286 | show_priv_conn_##field(struct class_device *cdev, char *buf) \ | |
1287 | { \ | |
1288 | struct iscsi_cls_conn *conn = iscsi_cdev_to_conn(cdev); \ | |
1289 | return sprintf(buf, format"\n", conn->field); \ | |
1290 | } | |
1291 | ||
1292 | #define iscsi_priv_conn_attr(field, format) \ | |
1293 | iscsi_priv_conn_attr_show(field, format) \ | |
1294 | static ISCSI_CLASS_ATTR(priv_conn, field, S_IRUGO, show_priv_conn_##field, \ | |
1295 | NULL) | |
1296 | iscsi_priv_conn_attr(persistent_address, "%s"); | |
1297 | iscsi_priv_conn_attr(persistent_port, "%d"); | |
1298 | ||
1299 | #define SETUP_PRIV_SESSION_RD_ATTR(field) \ | |
1300 | do { \ | |
1301 | priv->session_attrs[count] = &class_device_attr_priv_sess_##field; \ | |
1302 | count++; \ | |
1303 | } while (0) | |
1304 | ||
1305 | #define SETUP_SESSION_RD_ATTR(field, param_flag) \ | |
1306 | do { \ | |
1307 | if (tt->param_mask & param_flag) { \ | |
1308 | priv->session_attrs[count] = &class_device_attr_sess_##field; \ | |
1da177e4 | 1309 | count++; \ |
fd7255f5 MC |
1310 | } \ |
1311 | } while (0) | |
1312 | ||
1313 | #define SETUP_PRIV_CONN_RD_ATTR(field) \ | |
1314 | do { \ | |
1315 | priv->conn_attrs[count] = &class_device_attr_priv_conn_##field; \ | |
1316 | count++; \ | |
1317 | } while (0) | |
1318 | ||
1319 | #define SETUP_CONN_RD_ATTR(field, param_flag) \ | |
1320 | do { \ | |
1321 | if (tt->param_mask & param_flag) { \ | |
1322 | priv->conn_attrs[count] = &class_device_attr_conn_##field; \ | |
1323 | count++; \ | |
1324 | } \ | |
1325 | } while (0) | |
1da177e4 | 1326 | |
0896b752 AA |
1327 | static int iscsi_session_match(struct attribute_container *cont, |
1328 | struct device *dev) | |
1da177e4 | 1329 | { |
7b8631b5 | 1330 | struct iscsi_cls_session *session; |
1da177e4 | 1331 | struct Scsi_Host *shost; |
0896b752 AA |
1332 | struct iscsi_internal *priv; |
1333 | ||
1334 | if (!iscsi_is_session_dev(dev)) | |
1335 | return 0; | |
1da177e4 | 1336 | |
7b8631b5 MC |
1337 | session = iscsi_dev_to_session(dev); |
1338 | shost = iscsi_session_to_shost(session); | |
0896b752 | 1339 | if (!shost->transportt) |
1da177e4 LT |
1340 | return 0; |
1341 | ||
0896b752 AA |
1342 | priv = to_iscsi_internal(shost->transportt); |
1343 | if (priv->session_cont.ac.class != &iscsi_session_class.class) | |
1da177e4 LT |
1344 | return 0; |
1345 | ||
0896b752 | 1346 | return &priv->session_cont.ac == cont; |
1da177e4 LT |
1347 | } |
1348 | ||
0896b752 AA |
1349 | static int iscsi_conn_match(struct attribute_container *cont, |
1350 | struct device *dev) | |
1351 | { | |
7b8631b5 MC |
1352 | struct iscsi_cls_session *session; |
1353 | struct iscsi_cls_conn *conn; | |
1da177e4 | 1354 | struct Scsi_Host *shost; |
0896b752 | 1355 | struct iscsi_internal *priv; |
1da177e4 | 1356 | |
0896b752 | 1357 | if (!iscsi_is_conn_dev(dev)) |
1da177e4 LT |
1358 | return 0; |
1359 | ||
7b8631b5 MC |
1360 | conn = iscsi_dev_to_conn(dev); |
1361 | session = iscsi_dev_to_session(conn->dev.parent); | |
1362 | shost = iscsi_session_to_shost(session); | |
1363 | ||
0896b752 | 1364 | if (!shost->transportt) |
1da177e4 LT |
1365 | return 0; |
1366 | ||
0896b752 AA |
1367 | priv = to_iscsi_internal(shost->transportt); |
1368 | if (priv->conn_cont.ac.class != &iscsi_connection_class.class) | |
1369 | return 0; | |
1da177e4 | 1370 | |
0896b752 AA |
1371 | return &priv->conn_cont.ac == cont; |
1372 | } | |
1373 | ||
30a6c652 MC |
1374 | static int iscsi_host_match(struct attribute_container *cont, |
1375 | struct device *dev) | |
1376 | { | |
1377 | struct Scsi_Host *shost; | |
1378 | struct iscsi_internal *priv; | |
1379 | ||
1380 | if (!scsi_is_host_device(dev)) | |
1381 | return 0; | |
1382 | ||
1383 | shost = dev_to_shost(dev); | |
1384 | if (!shost->transportt || | |
1385 | shost->transportt->host_attrs.ac.class != &iscsi_host_class.class) | |
1386 | return 0; | |
1387 | ||
1388 | priv = to_iscsi_internal(shost->transportt); | |
1389 | return &priv->t.host_attrs.ac == cont; | |
1390 | } | |
1391 | ||
7b8631b5 MC |
1392 | struct scsi_transport_template * |
1393 | iscsi_register_transport(struct iscsi_transport *tt) | |
0896b752 AA |
1394 | { |
1395 | struct iscsi_internal *priv; | |
1396 | unsigned long flags; | |
1397 | int count = 0, err; | |
1398 | ||
1399 | BUG_ON(!tt); | |
1400 | ||
1401 | priv = iscsi_if_transport_lookup(tt); | |
1402 | if (priv) | |
7b8631b5 | 1403 | return NULL; |
0896b752 | 1404 | |
24669f75 | 1405 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
0896b752 | 1406 | if (!priv) |
7b8631b5 | 1407 | return NULL; |
0896b752 | 1408 | INIT_LIST_HEAD(&priv->list); |
0896b752 | 1409 | priv->iscsi_transport = tt; |
30a6c652 | 1410 | priv->t.user_scan = iscsi_user_scan; |
0896b752 AA |
1411 | |
1412 | priv->cdev.class = &iscsi_transport_class; | |
1413 | snprintf(priv->cdev.class_id, BUS_ID_SIZE, "%s", tt->name); | |
1414 | err = class_device_register(&priv->cdev); | |
1415 | if (err) | |
1416 | goto free_priv; | |
1417 | ||
1418 | err = sysfs_create_group(&priv->cdev.kobj, &iscsi_transport_group); | |
1419 | if (err) | |
1420 | goto unregister_cdev; | |
1421 | ||
30a6c652 MC |
1422 | /* host parameters */ |
1423 | priv->t.host_attrs.ac.attrs = &priv->host_attrs[0]; | |
1424 | priv->t.host_attrs.ac.class = &iscsi_host_class.class; | |
1425 | priv->t.host_attrs.ac.match = iscsi_host_match; | |
1426 | priv->t.host_size = sizeof(struct iscsi_host); | |
1427 | priv->host_attrs[0] = NULL; | |
1428 | transport_container_register(&priv->t.host_attrs); | |
1429 | ||
0896b752 AA |
1430 | /* connection parameters */ |
1431 | priv->conn_cont.ac.attrs = &priv->conn_attrs[0]; | |
1432 | priv->conn_cont.ac.class = &iscsi_connection_class.class; | |
1433 | priv->conn_cont.ac.match = iscsi_conn_match; | |
1434 | transport_container_register(&priv->conn_cont); | |
1da177e4 | 1435 | |
fd7255f5 MC |
1436 | SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_MAX_RECV_DLENGTH); |
1437 | SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_MAX_XMIT_DLENGTH); | |
1438 | SETUP_CONN_RD_ATTR(header_digest, ISCSI_HDRDGST_EN); | |
1439 | SETUP_CONN_RD_ATTR(data_digest, ISCSI_DATADGST_EN); | |
1440 | SETUP_CONN_RD_ATTR(ifmarker, ISCSI_IFMARKER_EN); | |
1441 | SETUP_CONN_RD_ATTR(ofmarker, ISCSI_OFMARKER_EN); | |
1442 | SETUP_CONN_RD_ATTR(address, ISCSI_CONN_ADDRESS); | |
1443 | SETUP_CONN_RD_ATTR(port, ISCSI_CONN_PORT); | |
8d2860b3 | 1444 | SETUP_CONN_RD_ATTR(exp_statsn, ISCSI_EXP_STATSN); |
fd7255f5 MC |
1445 | |
1446 | if (tt->param_mask & ISCSI_PERSISTENT_ADDRESS) | |
1447 | SETUP_CONN_RD_ATTR(persistent_address, ISCSI_PERSISTENT_ADDRESS); | |
1448 | else | |
1449 | SETUP_PRIV_CONN_RD_ATTR(persistent_address); | |
1450 | ||
1451 | if (tt->param_mask & ISCSI_PERSISTENT_PORT) | |
1452 | SETUP_CONN_RD_ATTR(persistent_port, ISCSI_PERSISTENT_PORT); | |
1453 | else | |
1454 | SETUP_PRIV_CONN_RD_ATTR(persistent_port); | |
0896b752 AA |
1455 | |
1456 | BUG_ON(count > ISCSI_CONN_ATTRS); | |
1457 | priv->conn_attrs[count] = NULL; | |
1da177e4 | 1458 | count = 0; |
1da177e4 | 1459 | |
0896b752 AA |
1460 | /* session parameters */ |
1461 | priv->session_cont.ac.attrs = &priv->session_attrs[0]; | |
1462 | priv->session_cont.ac.class = &iscsi_session_class.class; | |
1463 | priv->session_cont.ac.match = iscsi_session_match; | |
1464 | transport_container_register(&priv->session_cont); | |
1465 | ||
fd7255f5 MC |
1466 | SETUP_SESSION_RD_ATTR(initial_r2t, ISCSI_INITIAL_R2T_EN); |
1467 | SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_MAX_R2T); | |
1468 | SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_IMM_DATA_EN); | |
1469 | SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_FIRST_BURST); | |
1470 | SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_MAX_BURST); | |
1471 | SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PDU_INORDER_EN); | |
1472 | SETUP_SESSION_RD_ATTR(data_seq_in_order, ISCSI_DATASEQ_INORDER_EN); | |
1473 | SETUP_SESSION_RD_ATTR(erl, ISCSI_ERL); | |
30a6c652 | 1474 | SETUP_PRIV_SESSION_RD_ATTR(recovery_tmo); |
fd7255f5 MC |
1475 | |
1476 | if (tt->param_mask & ISCSI_TARGET_NAME) | |
1477 | SETUP_SESSION_RD_ATTR(targetname, ISCSI_TARGET_NAME); | |
1478 | else | |
1479 | SETUP_PRIV_SESSION_RD_ATTR(targetname); | |
1480 | ||
1481 | if (tt->param_mask & ISCSI_TPGT) | |
1482 | SETUP_SESSION_RD_ATTR(tpgt, ISCSI_TPGT); | |
1483 | else | |
1484 | SETUP_PRIV_SESSION_RD_ATTR(tpgt); | |
0896b752 AA |
1485 | |
1486 | BUG_ON(count > ISCSI_SESSION_ATTRS); | |
1487 | priv->session_attrs[count] = NULL; | |
1488 | ||
1489 | spin_lock_irqsave(&iscsi_transport_lock, flags); | |
1490 | list_add(&priv->list, &iscsi_transports); | |
1491 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
1492 | ||
1493 | printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name); | |
7b8631b5 | 1494 | return &priv->t; |
1da177e4 | 1495 | |
0896b752 AA |
1496 | unregister_cdev: |
1497 | class_device_unregister(&priv->cdev); | |
1498 | free_priv: | |
1499 | kfree(priv); | |
7b8631b5 | 1500 | return NULL; |
1da177e4 | 1501 | } |
0896b752 AA |
1502 | EXPORT_SYMBOL_GPL(iscsi_register_transport); |
1503 | ||
1504 | int iscsi_unregister_transport(struct iscsi_transport *tt) | |
1505 | { | |
1506 | struct iscsi_internal *priv; | |
1507 | unsigned long flags; | |
1508 | ||
1509 | BUG_ON(!tt); | |
1510 | ||
0b950672 | 1511 | mutex_lock(&rx_queue_mutex); |
0896b752 AA |
1512 | |
1513 | priv = iscsi_if_transport_lookup(tt); | |
1514 | BUG_ON (!priv); | |
1515 | ||
0896b752 AA |
1516 | spin_lock_irqsave(&iscsi_transport_lock, flags); |
1517 | list_del(&priv->list); | |
1518 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
1519 | ||
1520 | transport_container_unregister(&priv->conn_cont); | |
1521 | transport_container_unregister(&priv->session_cont); | |
30a6c652 | 1522 | transport_container_unregister(&priv->t.host_attrs); |
0896b752 AA |
1523 | |
1524 | sysfs_remove_group(&priv->cdev.kobj, &iscsi_transport_group); | |
1525 | class_device_unregister(&priv->cdev); | |
0b950672 | 1526 | mutex_unlock(&rx_queue_mutex); |
1da177e4 | 1527 | |
0896b752 AA |
1528 | return 0; |
1529 | } | |
1530 | EXPORT_SYMBOL_GPL(iscsi_unregister_transport); | |
1da177e4 | 1531 | |
0896b752 AA |
1532 | static int |
1533 | iscsi_rcv_nl_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1da177e4 | 1534 | { |
0896b752 AA |
1535 | struct netlink_notify *n = ptr; |
1536 | ||
1537 | if (event == NETLINK_URELEASE && | |
1538 | n->protocol == NETLINK_ISCSI && n->pid) { | |
7b8631b5 | 1539 | struct iscsi_cls_conn *conn; |
0896b752 AA |
1540 | unsigned long flags; |
1541 | ||
7b8631b5 | 1542 | mempool_zone_complete(z_reply); |
0896b752 AA |
1543 | spin_lock_irqsave(&connlock, flags); |
1544 | list_for_each_entry(conn, &connlist, conn_list) { | |
7b8631b5 MC |
1545 | mempool_zone_complete(conn->z_error); |
1546 | mempool_zone_complete(conn->z_pdu); | |
0896b752 AA |
1547 | } |
1548 | spin_unlock_irqrestore(&connlock, flags); | |
1549 | } | |
1da177e4 | 1550 | |
0896b752 | 1551 | return NOTIFY_DONE; |
1da177e4 LT |
1552 | } |
1553 | ||
0896b752 AA |
1554 | static struct notifier_block iscsi_nl_notifier = { |
1555 | .notifier_call = iscsi_rcv_nl_event, | |
1556 | }; | |
1da177e4 LT |
1557 | |
1558 | static __init int iscsi_transport_init(void) | |
1559 | { | |
0896b752 | 1560 | int err; |
1da177e4 | 1561 | |
0896b752 | 1562 | err = class_register(&iscsi_transport_class); |
1da177e4 LT |
1563 | if (err) |
1564 | return err; | |
0896b752 | 1565 | |
30a6c652 | 1566 | err = transport_class_register(&iscsi_host_class); |
0896b752 AA |
1567 | if (err) |
1568 | goto unregister_transport_class; | |
1569 | ||
30a6c652 MC |
1570 | err = transport_class_register(&iscsi_connection_class); |
1571 | if (err) | |
1572 | goto unregister_host_class; | |
1573 | ||
0896b752 AA |
1574 | err = transport_class_register(&iscsi_session_class); |
1575 | if (err) | |
1576 | goto unregister_conn_class; | |
1577 | ||
1578 | err = netlink_register_notifier(&iscsi_nl_notifier); | |
1579 | if (err) | |
1580 | goto unregister_session_class; | |
1581 | ||
2290d2b6 | 1582 | nls = netlink_kernel_create(NETLINK_ISCSI, 1, iscsi_if_rx, |
7b8631b5 | 1583 | THIS_MODULE); |
0896b752 AA |
1584 | if (!nls) { |
1585 | err = -ENOBUFS; | |
1586 | goto unregister_notifier; | |
1587 | } | |
1588 | ||
7b8631b5 | 1589 | z_reply = mempool_zone_init(Z_MAX_REPLY, |
0896b752 | 1590 | NLMSG_SPACE(sizeof(struct iscsi_uevent)), Z_HIWAT_REPLY); |
7b8631b5 | 1591 | if (z_reply) |
0896b752 AA |
1592 | return 0; |
1593 | ||
1594 | sock_release(nls->sk_socket); | |
1595 | unregister_notifier: | |
1596 | netlink_unregister_notifier(&iscsi_nl_notifier); | |
1597 | unregister_session_class: | |
1598 | transport_class_unregister(&iscsi_session_class); | |
1599 | unregister_conn_class: | |
1600 | transport_class_unregister(&iscsi_connection_class); | |
30a6c652 MC |
1601 | unregister_host_class: |
1602 | transport_class_unregister(&iscsi_host_class); | |
0896b752 AA |
1603 | unregister_transport_class: |
1604 | class_unregister(&iscsi_transport_class); | |
1605 | return err; | |
1da177e4 LT |
1606 | } |
1607 | ||
1608 | static void __exit iscsi_transport_exit(void) | |
1609 | { | |
7b8631b5 | 1610 | mempool_zone_destroy(z_reply); |
0896b752 AA |
1611 | sock_release(nls->sk_socket); |
1612 | netlink_unregister_notifier(&iscsi_nl_notifier); | |
1613 | transport_class_unregister(&iscsi_connection_class); | |
1614 | transport_class_unregister(&iscsi_session_class); | |
30a6c652 | 1615 | transport_class_unregister(&iscsi_host_class); |
0896b752 | 1616 | class_unregister(&iscsi_transport_class); |
1da177e4 LT |
1617 | } |
1618 | ||
1619 | module_init(iscsi_transport_init); | |
1620 | module_exit(iscsi_transport_exit); | |
1621 | ||
0896b752 AA |
1622 | MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, " |
1623 | "Dmitry Yusupov <dmitry_yus@yahoo.com>, " | |
1624 | "Alex Aizman <itn780@yahoo.com>"); | |
1625 | MODULE_DESCRIPTION("iSCSI Transport Interface"); | |
1da177e4 | 1626 | MODULE_LICENSE("GPL"); |