Commit | Line | Data |
---|---|---|
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 |
01dfc7fc | 37 | #define ISCSI_TRANSPORT_VERSION "2.0-685" |
1da177e4 LT |
38 | |
39 | struct iscsi_internal { | |
790f39a2 | 40 | int daemon_pid; |
1da177e4 | 41 | struct scsi_transport_template t; |
0896b752 AA |
42 | struct iscsi_transport *iscsi_transport; |
43 | struct list_head list; | |
0896b752 | 44 | struct class_device cdev; |
30a6c652 MC |
45 | |
46 | struct class_device_attribute *host_attrs[ISCSI_HOST_ATTRS + 1]; | |
0896b752 AA |
47 | struct transport_container conn_cont; |
48 | struct class_device_attribute *conn_attrs[ISCSI_CONN_ATTRS + 1]; | |
49 | struct transport_container session_cont; | |
1da177e4 | 50 | struct class_device_attribute *session_attrs[ISCSI_SESSION_ATTRS + 1]; |
1da177e4 LT |
51 | }; |
52 | ||
b5c7a12d MC |
53 | static int iscsi_session_nr; /* sysfs session id for next new session */ |
54 | ||
0896b752 AA |
55 | /* |
56 | * list of registered transports and lock that must | |
57 | * be held while accessing list. The iscsi_transport_lock must | |
0b950672 | 58 | * be acquired after the rx_queue_mutex. |
0896b752 AA |
59 | */ |
60 | static LIST_HEAD(iscsi_transports); | |
61 | static DEFINE_SPINLOCK(iscsi_transport_lock); | |
62 | ||
63 | #define to_iscsi_internal(tmpl) \ | |
64 | container_of(tmpl, struct iscsi_internal, t) | |
65 | ||
66 | #define cdev_to_iscsi_internal(_cdev) \ | |
67 | container_of(_cdev, struct iscsi_internal, cdev) | |
68 | ||
69 | static void iscsi_transport_release(struct class_device *cdev) | |
70 | { | |
71 | struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev); | |
72 | kfree(priv); | |
73 | } | |
1da177e4 | 74 | |
0896b752 AA |
75 | /* |
76 | * iscsi_transport_class represents the iscsi_transports that are | |
77 | * registered. | |
78 | */ | |
79 | static struct class iscsi_transport_class = { | |
80 | .name = "iscsi_transport", | |
81 | .release = iscsi_transport_release, | |
82 | }; | |
83 | ||
84 | static ssize_t | |
85 | show_transport_handle(struct class_device *cdev, char *buf) | |
86 | { | |
87 | struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev); | |
762e2bfa | 88 | return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport)); |
0896b752 AA |
89 | } |
90 | static CLASS_DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL); | |
91 | ||
92 | #define show_transport_attr(name, format) \ | |
93 | static ssize_t \ | |
94 | show_transport_##name(struct class_device *cdev, char *buf) \ | |
95 | { \ | |
96 | struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev); \ | |
97 | return sprintf(buf, format"\n", priv->iscsi_transport->name); \ | |
98 | } \ | |
99 | static CLASS_DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL); | |
100 | ||
101 | show_transport_attr(caps, "0x%x"); | |
102 | show_transport_attr(max_lun, "%d"); | |
103 | show_transport_attr(max_conn, "%d"); | |
104 | show_transport_attr(max_cmd_len, "%d"); | |
105 | ||
106 | static struct attribute *iscsi_transport_attrs[] = { | |
107 | &class_device_attr_handle.attr, | |
108 | &class_device_attr_caps.attr, | |
109 | &class_device_attr_max_lun.attr, | |
110 | &class_device_attr_max_conn.attr, | |
111 | &class_device_attr_max_cmd_len.attr, | |
112 | NULL, | |
113 | }; | |
114 | ||
115 | static struct attribute_group iscsi_transport_group = { | |
116 | .attrs = iscsi_transport_attrs, | |
117 | }; | |
118 | ||
30a6c652 MC |
119 | static int iscsi_setup_host(struct transport_container *tc, struct device *dev, |
120 | struct class_device *cdev) | |
121 | { | |
122 | struct Scsi_Host *shost = dev_to_shost(dev); | |
123 | struct iscsi_host *ihost = shost->shost_data; | |
124 | ||
125 | memset(ihost, 0, sizeof(*ihost)); | |
126 | INIT_LIST_HEAD(&ihost->sessions); | |
127 | mutex_init(&ihost->mutex); | |
128 | return 0; | |
129 | } | |
130 | ||
131 | static DECLARE_TRANSPORT_CLASS(iscsi_host_class, | |
132 | "iscsi_host", | |
133 | iscsi_setup_host, | |
134 | NULL, | |
135 | NULL); | |
136 | ||
0896b752 AA |
137 | static DECLARE_TRANSPORT_CLASS(iscsi_session_class, |
138 | "iscsi_session", | |
1da177e4 LT |
139 | NULL, |
140 | NULL, | |
141 | NULL); | |
142 | ||
0896b752 AA |
143 | static DECLARE_TRANSPORT_CLASS(iscsi_connection_class, |
144 | "iscsi_connection", | |
1da177e4 LT |
145 | NULL, |
146 | NULL, | |
147 | NULL); | |
0896b752 AA |
148 | |
149 | static struct sock *nls; | |
0b950672 | 150 | static DEFINE_MUTEX(rx_queue_mutex); |
0896b752 AA |
151 | |
152 | struct mempool_zone { | |
153 | mempool_t *pool; | |
154 | atomic_t allocated; | |
155 | int size; | |
156 | int hiwat; | |
157 | struct list_head freequeue; | |
158 | spinlock_t freelock; | |
159 | }; | |
160 | ||
7b8631b5 | 161 | static struct mempool_zone *z_reply; |
0896b752 | 162 | |
1da177e4 | 163 | /* |
0896b752 AA |
164 | * Z_MAX_* - actual mempool size allocated at the mempool_zone_init() time |
165 | * Z_HIWAT_* - zone's high watermark when if_error bit will be set to -ENOMEM | |
166 | * so daemon will notice OOM on NETLINK tranposrt level and will | |
167 | * be able to predict or change operational behavior | |
1da177e4 | 168 | */ |
0896b752 AA |
169 | #define Z_MAX_REPLY 8 |
170 | #define Z_HIWAT_REPLY 6 | |
171 | #define Z_MAX_PDU 8 | |
172 | #define Z_HIWAT_PDU 6 | |
173 | #define Z_MAX_ERROR 16 | |
174 | #define Z_HIWAT_ERROR 12 | |
175 | ||
7b7232f3 MC |
176 | static LIST_HEAD(sesslist); |
177 | static DEFINE_SPINLOCK(sesslock); | |
7b8631b5 MC |
178 | static LIST_HEAD(connlist); |
179 | static DEFINE_SPINLOCK(connlock); | |
0896b752 | 180 | |
b5c7a12d MC |
181 | static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn) |
182 | { | |
183 | struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent); | |
184 | return sess->sid; | |
185 | } | |
186 | ||
187 | /* | |
188 | * Returns the matching session to a given sid | |
189 | */ | |
190 | static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid) | |
7b7232f3 MC |
191 | { |
192 | unsigned long flags; | |
193 | struct iscsi_cls_session *sess; | |
194 | ||
195 | spin_lock_irqsave(&sesslock, flags); | |
196 | list_for_each_entry(sess, &sesslist, sess_list) { | |
b5c7a12d | 197 | if (sess->sid == sid) { |
7b7232f3 MC |
198 | spin_unlock_irqrestore(&sesslock, flags); |
199 | return sess; | |
200 | } | |
201 | } | |
202 | spin_unlock_irqrestore(&sesslock, flags); | |
203 | return NULL; | |
204 | } | |
205 | ||
b5c7a12d MC |
206 | /* |
207 | * Returns the matching connection to a given sid / cid tuple | |
208 | */ | |
209 | static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid) | |
7b7232f3 MC |
210 | { |
211 | unsigned long flags; | |
212 | struct iscsi_cls_conn *conn; | |
213 | ||
214 | spin_lock_irqsave(&connlock, flags); | |
215 | list_for_each_entry(conn, &connlist, conn_list) { | |
b5c7a12d | 216 | if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) { |
7b7232f3 MC |
217 | spin_unlock_irqrestore(&connlock, flags); |
218 | return conn; | |
219 | } | |
220 | } | |
221 | spin_unlock_irqrestore(&connlock, flags); | |
222 | return NULL; | |
223 | } | |
224 | ||
7b8631b5 MC |
225 | /* |
226 | * The following functions can be used by LLDs that allocate | |
227 | * their own scsi_hosts or by software iscsi LLDs | |
228 | */ | |
229 | static void iscsi_session_release(struct device *dev) | |
230 | { | |
231 | struct iscsi_cls_session *session = iscsi_dev_to_session(dev); | |
7b8631b5 | 232 | struct Scsi_Host *shost; |
0896b752 | 233 | |
7b8631b5 MC |
234 | shost = iscsi_session_to_shost(session); |
235 | scsi_host_put(shost); | |
236 | kfree(session); | |
7b8631b5 | 237 | } |
0896b752 | 238 | |
7b8631b5 MC |
239 | static int iscsi_is_session_dev(const struct device *dev) |
240 | { | |
241 | return dev->release == iscsi_session_release; | |
242 | } | |
0896b752 | 243 | |
30a6c652 MC |
244 | static int iscsi_user_scan(struct Scsi_Host *shost, uint channel, |
245 | uint id, uint lun) | |
246 | { | |
247 | struct iscsi_host *ihost = shost->shost_data; | |
248 | struct iscsi_cls_session *session; | |
249 | ||
250 | mutex_lock(&ihost->mutex); | |
251 | list_for_each_entry(session, &ihost->sessions, host_list) { | |
e6f3b63f | 252 | if ((channel == SCAN_WILD_CARD || channel == 0) && |
30a6c652 | 253 | (id == SCAN_WILD_CARD || id == session->target_id)) |
e6f3b63f | 254 | scsi_scan_target(&session->dev, 0, |
30a6c652 MC |
255 | session->target_id, lun, 1); |
256 | } | |
257 | mutex_unlock(&ihost->mutex); | |
258 | ||
259 | return 0; | |
260 | } | |
261 | ||
262 | static void session_recovery_timedout(void *data) | |
263 | { | |
264 | struct iscsi_cls_session *session = data; | |
265 | ||
be2df72e OG |
266 | dev_printk(KERN_INFO, &session->dev, "iscsi: session recovery timed " |
267 | "out after %d secs\n", session->recovery_tmo); | |
30a6c652 MC |
268 | |
269 | if (session->transport->session_recovery_timedout) | |
270 | session->transport->session_recovery_timedout(session); | |
271 | ||
272 | scsi_target_unblock(&session->dev); | |
273 | } | |
274 | ||
275 | void iscsi_unblock_session(struct iscsi_cls_session *session) | |
276 | { | |
277 | if (!cancel_delayed_work(&session->recovery_work)) | |
278 | flush_scheduled_work(); | |
279 | scsi_target_unblock(&session->dev); | |
280 | } | |
281 | EXPORT_SYMBOL_GPL(iscsi_unblock_session); | |
282 | ||
283 | void iscsi_block_session(struct iscsi_cls_session *session) | |
284 | { | |
285 | scsi_target_block(&session->dev); | |
286 | schedule_delayed_work(&session->recovery_work, | |
287 | session->recovery_tmo * HZ); | |
288 | } | |
289 | EXPORT_SYMBOL_GPL(iscsi_block_session); | |
290 | ||
7b8631b5 | 291 | struct iscsi_cls_session * |
8434aa8b MC |
292 | iscsi_alloc_session(struct Scsi_Host *shost, |
293 | struct iscsi_transport *transport) | |
7b8631b5 MC |
294 | { |
295 | struct iscsi_cls_session *session; | |
7b8631b5 | 296 | |
b5c7a12d MC |
297 | session = kzalloc(sizeof(*session) + transport->sessiondata_size, |
298 | GFP_KERNEL); | |
7b8631b5 | 299 | if (!session) |
f53a88da MC |
300 | return NULL; |
301 | ||
7b8631b5 | 302 | session->transport = transport; |
30a6c652 MC |
303 | session->recovery_tmo = 120; |
304 | INIT_WORK(&session->recovery_work, session_recovery_timedout, session); | |
305 | INIT_LIST_HEAD(&session->host_list); | |
306 | INIT_LIST_HEAD(&session->sess_list); | |
7b8631b5 | 307 | |
6a8a0d36 MC |
308 | /* this is released in the dev's release function */ |
309 | scsi_host_get(shost); | |
8434aa8b MC |
310 | session->dev.parent = &shost->shost_gendev; |
311 | session->dev.release = iscsi_session_release; | |
312 | device_initialize(&session->dev); | |
b5c7a12d MC |
313 | if (transport->sessiondata_size) |
314 | session->dd_data = &session[1]; | |
8434aa8b MC |
315 | return session; |
316 | } | |
317 | EXPORT_SYMBOL_GPL(iscsi_alloc_session); | |
318 | ||
6a8a0d36 | 319 | int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id) |
8434aa8b MC |
320 | { |
321 | struct Scsi_Host *shost = iscsi_session_to_shost(session); | |
322 | struct iscsi_host *ihost; | |
323 | int err; | |
b5c7a12d | 324 | |
30a6c652 | 325 | ihost = shost->shost_data; |
b5c7a12d | 326 | session->sid = iscsi_session_nr++; |
6a8a0d36 | 327 | session->target_id = target_id; |
30a6c652 | 328 | |
b5c7a12d MC |
329 | snprintf(session->dev.bus_id, BUS_ID_SIZE, "session%u", |
330 | session->sid); | |
8434aa8b | 331 | err = device_add(&session->dev); |
7b8631b5 MC |
332 | if (err) { |
333 | dev_printk(KERN_ERR, &session->dev, "iscsi: could not " | |
334 | "register session's dev\n"); | |
8434aa8b | 335 | goto release_host; |
7b8631b5 MC |
336 | } |
337 | transport_register_device(&session->dev); | |
338 | ||
30a6c652 MC |
339 | mutex_lock(&ihost->mutex); |
340 | list_add(&session->host_list, &ihost->sessions); | |
341 | mutex_unlock(&ihost->mutex); | |
8434aa8b | 342 | return 0; |
30a6c652 | 343 | |
8434aa8b MC |
344 | release_host: |
345 | scsi_host_put(shost); | |
346 | return err; | |
7b8631b5 | 347 | } |
8434aa8b | 348 | EXPORT_SYMBOL_GPL(iscsi_add_session); |
7b8631b5 MC |
349 | |
350 | /** | |
8434aa8b MC |
351 | * iscsi_create_session - create iscsi class session |
352 | * @shost: scsi host | |
353 | * @transport: iscsi transport | |
7b8631b5 | 354 | * |
8434aa8b | 355 | * This can be called from a LLD or iscsi_transport. |
7b8631b5 | 356 | **/ |
8434aa8b MC |
357 | struct iscsi_cls_session * |
358 | iscsi_create_session(struct Scsi_Host *shost, | |
6a8a0d36 MC |
359 | struct iscsi_transport *transport, |
360 | unsigned int target_id) | |
8434aa8b MC |
361 | { |
362 | struct iscsi_cls_session *session; | |
363 | ||
364 | session = iscsi_alloc_session(shost, transport); | |
365 | if (!session) | |
366 | return NULL; | |
367 | ||
6a8a0d36 | 368 | if (iscsi_add_session(session, target_id)) { |
8434aa8b MC |
369 | iscsi_free_session(session); |
370 | return NULL; | |
371 | } | |
372 | return session; | |
373 | } | |
374 | EXPORT_SYMBOL_GPL(iscsi_create_session); | |
375 | ||
376 | void iscsi_remove_session(struct iscsi_cls_session *session) | |
7b8631b5 | 377 | { |
30a6c652 MC |
378 | struct Scsi_Host *shost = iscsi_session_to_shost(session); |
379 | struct iscsi_host *ihost = shost->shost_data; | |
380 | ||
381 | if (!cancel_delayed_work(&session->recovery_work)) | |
382 | flush_scheduled_work(); | |
383 | ||
384 | mutex_lock(&ihost->mutex); | |
385 | list_del(&session->host_list); | |
386 | mutex_unlock(&ihost->mutex); | |
387 | ||
8434aa8b MC |
388 | scsi_remove_target(&session->dev); |
389 | ||
7b8631b5 | 390 | transport_unregister_device(&session->dev); |
8434aa8b MC |
391 | device_del(&session->dev); |
392 | } | |
393 | EXPORT_SYMBOL_GPL(iscsi_remove_session); | |
394 | ||
395 | void iscsi_free_session(struct iscsi_cls_session *session) | |
396 | { | |
397 | put_device(&session->dev); | |
7b8631b5 MC |
398 | } |
399 | ||
8434aa8b MC |
400 | EXPORT_SYMBOL_GPL(iscsi_free_session); |
401 | ||
402 | /** | |
403 | * iscsi_destroy_session - destroy iscsi session | |
404 | * @session: iscsi_session | |
405 | * | |
406 | * Can be called by a LLD or iscsi_transport. There must not be | |
407 | * any running connections. | |
408 | **/ | |
409 | int iscsi_destroy_session(struct iscsi_cls_session *session) | |
410 | { | |
411 | iscsi_remove_session(session); | |
412 | iscsi_free_session(session); | |
413 | return 0; | |
414 | } | |
7b8631b5 MC |
415 | EXPORT_SYMBOL_GPL(iscsi_destroy_session); |
416 | ||
53cb8a1f MC |
417 | static void mempool_zone_destroy(struct mempool_zone *zp) |
418 | { | |
419 | mempool_destroy(zp->pool); | |
420 | kfree(zp); | |
421 | } | |
422 | ||
423 | static void* | |
424 | mempool_zone_alloc_skb(gfp_t gfp_mask, void *pool_data) | |
425 | { | |
426 | struct mempool_zone *zone = pool_data; | |
427 | ||
428 | return alloc_skb(zone->size, gfp_mask); | |
429 | } | |
430 | ||
431 | static void | |
432 | mempool_zone_free_skb(void *element, void *pool_data) | |
433 | { | |
434 | kfree_skb(element); | |
435 | } | |
436 | ||
437 | static struct mempool_zone * | |
438 | mempool_zone_init(unsigned max, unsigned size, unsigned hiwat) | |
439 | { | |
440 | struct mempool_zone *zp; | |
441 | ||
442 | zp = kzalloc(sizeof(*zp), GFP_KERNEL); | |
443 | if (!zp) | |
444 | return NULL; | |
445 | ||
446 | zp->size = size; | |
447 | zp->hiwat = hiwat; | |
448 | INIT_LIST_HEAD(&zp->freequeue); | |
449 | spin_lock_init(&zp->freelock); | |
450 | atomic_set(&zp->allocated, 0); | |
451 | ||
452 | zp->pool = mempool_create(max, mempool_zone_alloc_skb, | |
453 | mempool_zone_free_skb, zp); | |
454 | if (!zp->pool) { | |
455 | kfree(zp); | |
456 | return NULL; | |
457 | } | |
458 | ||
459 | return zp; | |
460 | } | |
461 | ||
7b8631b5 MC |
462 | static void iscsi_conn_release(struct device *dev) |
463 | { | |
464 | struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev); | |
465 | struct device *parent = conn->dev.parent; | |
466 | ||
53cb8a1f MC |
467 | mempool_zone_destroy(conn->z_pdu); |
468 | mempool_zone_destroy(conn->z_error); | |
469 | ||
7b8631b5 MC |
470 | kfree(conn); |
471 | put_device(parent); | |
472 | } | |
473 | ||
474 | static int iscsi_is_conn_dev(const struct device *dev) | |
475 | { | |
476 | return dev->release == iscsi_conn_release; | |
477 | } | |
478 | ||
53cb8a1f MC |
479 | static int iscsi_create_event_pools(struct iscsi_cls_conn *conn) |
480 | { | |
481 | conn->z_pdu = mempool_zone_init(Z_MAX_PDU, | |
482 | NLMSG_SPACE(sizeof(struct iscsi_uevent) + | |
483 | sizeof(struct iscsi_hdr) + | |
484 | DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH), | |
485 | Z_HIWAT_PDU); | |
486 | if (!conn->z_pdu) { | |
487 | dev_printk(KERN_ERR, &conn->dev, "iscsi: can not allocate " | |
488 | "pdu zone for new conn\n"); | |
489 | return -ENOMEM; | |
490 | } | |
491 | ||
492 | conn->z_error = mempool_zone_init(Z_MAX_ERROR, | |
493 | NLMSG_SPACE(sizeof(struct iscsi_uevent)), | |
494 | Z_HIWAT_ERROR); | |
495 | if (!conn->z_error) { | |
496 | dev_printk(KERN_ERR, &conn->dev, "iscsi: can not allocate " | |
497 | "error zone for new conn\n"); | |
498 | mempool_zone_destroy(conn->z_pdu); | |
499 | return -ENOMEM; | |
500 | } | |
501 | return 0; | |
502 | } | |
503 | ||
7b8631b5 MC |
504 | /** |
505 | * iscsi_create_conn - create iscsi class connection | |
506 | * @session: iscsi cls session | |
507 | * @cid: connection id | |
508 | * | |
509 | * This can be called from a LLD or iscsi_transport. The connection | |
510 | * is child of the session so cid must be unique for all connections | |
511 | * on the session. | |
b5c7a12d MC |
512 | * |
513 | * Since we do not support MCS, cid will normally be zero. In some cases | |
514 | * for software iscsi we could be trying to preallocate a connection struct | |
515 | * in which case there could be two connection structs and cid would be | |
516 | * non-zero. | |
7b8631b5 MC |
517 | **/ |
518 | struct iscsi_cls_conn * | |
519 | iscsi_create_conn(struct iscsi_cls_session *session, uint32_t cid) | |
520 | { | |
521 | struct iscsi_transport *transport = session->transport; | |
7b8631b5 MC |
522 | struct iscsi_cls_conn *conn; |
523 | int err; | |
524 | ||
525 | conn = kzalloc(sizeof(*conn) + transport->conndata_size, GFP_KERNEL); | |
526 | if (!conn) | |
527 | return NULL; | |
528 | ||
529 | if (transport->conndata_size) | |
530 | conn->dd_data = &conn[1]; | |
531 | ||
532 | INIT_LIST_HEAD(&conn->conn_list); | |
533 | conn->transport = transport; | |
b5c7a12d | 534 | conn->cid = cid; |
7b8631b5 | 535 | |
53cb8a1f MC |
536 | if (iscsi_create_event_pools(conn)) |
537 | goto free_conn; | |
538 | ||
7b8631b5 MC |
539 | /* this is released in the dev's release function */ |
540 | if (!get_device(&session->dev)) | |
53cb8a1f | 541 | goto free_conn_pools; |
b5c7a12d | 542 | |
7b8631b5 | 543 | snprintf(conn->dev.bus_id, BUS_ID_SIZE, "connection%d:%u", |
b5c7a12d | 544 | session->sid, cid); |
7b8631b5 MC |
545 | conn->dev.parent = &session->dev; |
546 | conn->dev.release = iscsi_conn_release; | |
547 | err = device_register(&conn->dev); | |
548 | if (err) { | |
549 | dev_printk(KERN_ERR, &conn->dev, "iscsi: could not register " | |
550 | "connection's dev\n"); | |
551 | goto release_parent_ref; | |
552 | } | |
553 | transport_register_device(&conn->dev); | |
554 | return conn; | |
555 | ||
556 | release_parent_ref: | |
557 | put_device(&session->dev); | |
53cb8a1f MC |
558 | free_conn_pools: |
559 | ||
7b8631b5 MC |
560 | free_conn: |
561 | kfree(conn); | |
562 | return NULL; | |
563 | } | |
564 | ||
565 | EXPORT_SYMBOL_GPL(iscsi_create_conn); | |
566 | ||
567 | /** | |
568 | * iscsi_destroy_conn - destroy iscsi class connection | |
569 | * @session: iscsi cls session | |
570 | * | |
571 | * This can be called from a LLD or iscsi_transport. | |
572 | **/ | |
573 | int iscsi_destroy_conn(struct iscsi_cls_conn *conn) | |
574 | { | |
575 | transport_unregister_device(&conn->dev); | |
576 | device_unregister(&conn->dev); | |
577 | return 0; | |
578 | } | |
579 | ||
580 | EXPORT_SYMBOL_GPL(iscsi_destroy_conn); | |
581 | ||
7b8631b5 MC |
582 | /* |
583 | * iscsi interface functions | |
584 | */ | |
0896b752 AA |
585 | static struct iscsi_internal * |
586 | iscsi_if_transport_lookup(struct iscsi_transport *tt) | |
587 | { | |
588 | struct iscsi_internal *priv; | |
589 | unsigned long flags; | |
590 | ||
591 | spin_lock_irqsave(&iscsi_transport_lock, flags); | |
592 | list_for_each_entry(priv, &iscsi_transports, list) { | |
593 | if (tt == priv->iscsi_transport) { | |
594 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
595 | return priv; | |
596 | } | |
597 | } | |
598 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
599 | return NULL; | |
600 | } | |
1da177e4 | 601 | |
0896b752 AA |
602 | static inline struct list_head *skb_to_lh(struct sk_buff *skb) |
603 | { | |
604 | return (struct list_head *)&skb->cb; | |
605 | } | |
1da177e4 | 606 | |
0896b752 AA |
607 | static void |
608 | mempool_zone_complete(struct mempool_zone *zone) | |
609 | { | |
610 | unsigned long flags; | |
611 | struct list_head *lh, *n; | |
1da177e4 | 612 | |
0896b752 AA |
613 | spin_lock_irqsave(&zone->freelock, flags); |
614 | list_for_each_safe(lh, n, &zone->freequeue) { | |
615 | struct sk_buff *skb = (struct sk_buff *)((char *)lh - | |
616 | offsetof(struct sk_buff, cb)); | |
617 | if (!skb_shared(skb)) { | |
618 | list_del(skb_to_lh(skb)); | |
619 | mempool_free(skb, zone->pool); | |
620 | atomic_dec(&zone->allocated); | |
621 | } | |
622 | } | |
623 | spin_unlock_irqrestore(&zone->freelock, flags); | |
1da177e4 LT |
624 | } |
625 | ||
0896b752 AA |
626 | static struct sk_buff* |
627 | mempool_zone_get_skb(struct mempool_zone *zone) | |
1da177e4 | 628 | { |
0896b752 AA |
629 | struct sk_buff *skb; |
630 | ||
631 | skb = mempool_alloc(zone->pool, GFP_ATOMIC); | |
632 | if (skb) | |
633 | atomic_inc(&zone->allocated); | |
634 | return skb; | |
635 | } | |
1da177e4 | 636 | |
53cb8a1f | 637 | static int |
9aaa2b46 | 638 | iscsi_broadcast_skb(struct mempool_zone *zone, struct sk_buff *skb, gfp_t gfp) |
53cb8a1f MC |
639 | { |
640 | unsigned long flags; | |
641 | int rc; | |
642 | ||
643 | skb_get(skb); | |
9aaa2b46 | 644 | rc = netlink_broadcast(nls, skb, 0, 1, gfp); |
53cb8a1f MC |
645 | if (rc < 0) { |
646 | mempool_free(skb, zone->pool); | |
647 | printk(KERN_ERR "iscsi: can not broadcast skb (%d)\n", rc); | |
648 | return rc; | |
649 | } | |
650 | ||
651 | spin_lock_irqsave(&zone->freelock, flags); | |
652 | INIT_LIST_HEAD(skb_to_lh(skb)); | |
653 | list_add(skb_to_lh(skb), &zone->freequeue); | |
654 | spin_unlock_irqrestore(&zone->freelock, flags); | |
655 | return 0; | |
656 | } | |
657 | ||
0896b752 | 658 | static int |
790f39a2 | 659 | iscsi_unicast_skb(struct mempool_zone *zone, struct sk_buff *skb, int pid) |
0896b752 AA |
660 | { |
661 | unsigned long flags; | |
662 | int rc; | |
1da177e4 | 663 | |
0896b752 | 664 | skb_get(skb); |
790f39a2 | 665 | rc = netlink_unicast(nls, skb, pid, MSG_DONTWAIT); |
0896b752 AA |
666 | if (rc < 0) { |
667 | mempool_free(skb, zone->pool); | |
668 | printk(KERN_ERR "iscsi: can not unicast skb (%d)\n", rc); | |
669 | return rc; | |
670 | } | |
671 | ||
672 | spin_lock_irqsave(&zone->freelock, flags); | |
30a6c652 | 673 | INIT_LIST_HEAD(skb_to_lh(skb)); |
0896b752 AA |
674 | list_add(skb_to_lh(skb), &zone->freequeue); |
675 | spin_unlock_irqrestore(&zone->freelock, flags); | |
676 | ||
677 | return 0; | |
1da177e4 | 678 | } |
1da177e4 | 679 | |
7b7232f3 | 680 | int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr, |
0896b752 | 681 | char *data, uint32_t data_size) |
1da177e4 | 682 | { |
0896b752 AA |
683 | struct nlmsghdr *nlh; |
684 | struct sk_buff *skb; | |
685 | struct iscsi_uevent *ev; | |
0896b752 | 686 | char *pdu; |
790f39a2 | 687 | struct iscsi_internal *priv; |
0896b752 AA |
688 | int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) + |
689 | data_size); | |
690 | ||
790f39a2 MC |
691 | priv = iscsi_if_transport_lookup(conn->transport); |
692 | if (!priv) | |
693 | return -EINVAL; | |
694 | ||
7b8631b5 | 695 | mempool_zone_complete(conn->z_pdu); |
0896b752 | 696 | |
7b8631b5 | 697 | skb = mempool_zone_get_skb(conn->z_pdu); |
0896b752 | 698 | if (!skb) { |
7b7232f3 | 699 | iscsi_conn_error(conn, ISCSI_ERR_CONN_FAILED); |
7b8631b5 MC |
700 | dev_printk(KERN_ERR, &conn->dev, "iscsi: can not deliver " |
701 | "control PDU: OOM\n"); | |
0896b752 AA |
702 | return -ENOMEM; |
703 | } | |
1da177e4 | 704 | |
790f39a2 | 705 | nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0); |
0896b752 AA |
706 | ev = NLMSG_DATA(nlh); |
707 | memset(ev, 0, sizeof(*ev)); | |
708 | ev->transport_handle = iscsi_handle(conn->transport); | |
709 | ev->type = ISCSI_KEVENT_RECV_PDU; | |
7b8631b5 | 710 | if (atomic_read(&conn->z_pdu->allocated) >= conn->z_pdu->hiwat) |
0896b752 | 711 | ev->iferror = -ENOMEM; |
b5c7a12d MC |
712 | ev->r.recv_req.cid = conn->cid; |
713 | ev->r.recv_req.sid = iscsi_conn_get_sid(conn); | |
0896b752 AA |
714 | pdu = (char*)ev + sizeof(*ev); |
715 | memcpy(pdu, hdr, sizeof(struct iscsi_hdr)); | |
716 | memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size); | |
1da177e4 | 717 | |
790f39a2 | 718 | return iscsi_unicast_skb(conn->z_pdu, skb, priv->daemon_pid); |
1da177e4 | 719 | } |
0896b752 | 720 | EXPORT_SYMBOL_GPL(iscsi_recv_pdu); |
1da177e4 | 721 | |
7b7232f3 | 722 | void iscsi_conn_error(struct iscsi_cls_conn *conn, enum iscsi_err error) |
1da177e4 | 723 | { |
0896b752 AA |
724 | struct nlmsghdr *nlh; |
725 | struct sk_buff *skb; | |
726 | struct iscsi_uevent *ev; | |
790f39a2 | 727 | struct iscsi_internal *priv; |
0896b752 AA |
728 | int len = NLMSG_SPACE(sizeof(*ev)); |
729 | ||
790f39a2 MC |
730 | priv = iscsi_if_transport_lookup(conn->transport); |
731 | if (!priv) | |
732 | return; | |
733 | ||
7b8631b5 | 734 | mempool_zone_complete(conn->z_error); |
0896b752 | 735 | |
7b8631b5 | 736 | skb = mempool_zone_get_skb(conn->z_error); |
0896b752 | 737 | if (!skb) { |
7b8631b5 MC |
738 | dev_printk(KERN_ERR, &conn->dev, "iscsi: gracefully ignored " |
739 | "conn error (%d)\n", error); | |
0896b752 AA |
740 | return; |
741 | } | |
742 | ||
790f39a2 | 743 | nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0); |
0896b752 AA |
744 | ev = NLMSG_DATA(nlh); |
745 | ev->transport_handle = iscsi_handle(conn->transport); | |
746 | ev->type = ISCSI_KEVENT_CONN_ERROR; | |
7b8631b5 | 747 | if (atomic_read(&conn->z_error->allocated) >= conn->z_error->hiwat) |
0896b752 AA |
748 | ev->iferror = -ENOMEM; |
749 | ev->r.connerror.error = error; | |
b5c7a12d MC |
750 | ev->r.connerror.cid = conn->cid; |
751 | ev->r.connerror.sid = iscsi_conn_get_sid(conn); | |
1da177e4 | 752 | |
9aaa2b46 | 753 | iscsi_broadcast_skb(conn->z_error, skb, GFP_ATOMIC); |
1da177e4 | 754 | |
7b8631b5 MC |
755 | dev_printk(KERN_INFO, &conn->dev, "iscsi: detected conn error (%d)\n", |
756 | error); | |
0896b752 AA |
757 | } |
758 | EXPORT_SYMBOL_GPL(iscsi_conn_error); | |
759 | ||
760 | static int | |
761 | iscsi_if_send_reply(int pid, int seq, int type, int done, int multi, | |
762 | void *payload, int size) | |
763 | { | |
764 | struct sk_buff *skb; | |
765 | struct nlmsghdr *nlh; | |
766 | int len = NLMSG_SPACE(size); | |
767 | int flags = multi ? NLM_F_MULTI : 0; | |
768 | int t = done ? NLMSG_DONE : type; | |
769 | ||
7b8631b5 | 770 | mempool_zone_complete(z_reply); |
0896b752 | 771 | |
7b8631b5 | 772 | skb = mempool_zone_get_skb(z_reply); |
0896b752 AA |
773 | /* |
774 | * FIXME: | |
775 | * user is supposed to react on iferror == -ENOMEM; | |
776 | * see iscsi_if_rx(). | |
777 | */ | |
778 | BUG_ON(!skb); | |
779 | ||
780 | nlh = __nlmsg_put(skb, pid, seq, t, (len - sizeof(*nlh)), 0); | |
781 | nlh->nlmsg_flags = flags; | |
782 | memcpy(NLMSG_DATA(nlh), payload, size); | |
790f39a2 | 783 | return iscsi_unicast_skb(z_reply, skb, pid); |
1da177e4 | 784 | } |
1da177e4 | 785 | |
7b8631b5 | 786 | static int |
5b940adf | 787 | iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh) |
7b8631b5 MC |
788 | { |
789 | struct iscsi_uevent *ev = NLMSG_DATA(nlh); | |
790 | struct iscsi_stats *stats; | |
791 | struct sk_buff *skbstat; | |
792 | struct iscsi_cls_conn *conn; | |
793 | struct nlmsghdr *nlhstat; | |
794 | struct iscsi_uevent *evstat; | |
790f39a2 | 795 | struct iscsi_internal *priv; |
7b8631b5 MC |
796 | int len = NLMSG_SPACE(sizeof(*ev) + |
797 | sizeof(struct iscsi_stats) + | |
798 | sizeof(struct iscsi_stats_custom) * | |
799 | ISCSI_STATS_CUSTOM_MAX); | |
800 | int err = 0; | |
0896b752 | 801 | |
790f39a2 MC |
802 | priv = iscsi_if_transport_lookup(transport); |
803 | if (!priv) | |
804 | return -EINVAL; | |
805 | ||
b5c7a12d | 806 | conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid); |
7b8631b5 MC |
807 | if (!conn) |
808 | return -EEXIST; | |
0896b752 | 809 | |
7b8631b5 MC |
810 | do { |
811 | int actual_size; | |
0896b752 | 812 | |
7b8631b5 | 813 | mempool_zone_complete(conn->z_pdu); |
0896b752 | 814 | |
7b8631b5 MC |
815 | skbstat = mempool_zone_get_skb(conn->z_pdu); |
816 | if (!skbstat) { | |
817 | dev_printk(KERN_ERR, &conn->dev, "iscsi: can not " | |
818 | "deliver stats: OOM\n"); | |
819 | return -ENOMEM; | |
820 | } | |
821 | ||
790f39a2 | 822 | nlhstat = __nlmsg_put(skbstat, priv->daemon_pid, 0, 0, |
7b8631b5 MC |
823 | (len - sizeof(*nlhstat)), 0); |
824 | evstat = NLMSG_DATA(nlhstat); | |
825 | memset(evstat, 0, sizeof(*evstat)); | |
826 | evstat->transport_handle = iscsi_handle(conn->transport); | |
827 | evstat->type = nlh->nlmsg_type; | |
828 | if (atomic_read(&conn->z_pdu->allocated) >= conn->z_pdu->hiwat) | |
829 | evstat->iferror = -ENOMEM; | |
b5c7a12d MC |
830 | evstat->u.get_stats.cid = |
831 | ev->u.get_stats.cid; | |
832 | evstat->u.get_stats.sid = | |
833 | ev->u.get_stats.sid; | |
7b8631b5 MC |
834 | stats = (struct iscsi_stats *) |
835 | ((char*)evstat + sizeof(*evstat)); | |
836 | memset(stats, 0, sizeof(*stats)); | |
837 | ||
7b7232f3 | 838 | transport->get_stats(conn, stats); |
7b8631b5 MC |
839 | actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) + |
840 | sizeof(struct iscsi_stats) + | |
841 | sizeof(struct iscsi_stats_custom) * | |
842 | stats->custom_length); | |
843 | actual_size -= sizeof(*nlhstat); | |
844 | actual_size = NLMSG_LENGTH(actual_size); | |
5b940adf | 845 | skb_trim(skbstat, NLMSG_ALIGN(actual_size)); |
7b8631b5 MC |
846 | nlhstat->nlmsg_len = actual_size; |
847 | ||
790f39a2 | 848 | err = iscsi_unicast_skb(conn->z_pdu, skbstat, priv->daemon_pid); |
7b8631b5 MC |
849 | } while (err < 0 && err != -ECONNREFUSED); |
850 | ||
851 | return err; | |
0896b752 AA |
852 | } |
853 | ||
53cb8a1f MC |
854 | /** |
855 | * iscsi_if_destroy_session_done - send session destr. completion event | |
856 | * @conn: last connection for session | |
857 | * | |
858 | * This is called by HW iscsi LLDs to notify userpsace that its HW has | |
859 | * removed a session. | |
860 | **/ | |
861 | int iscsi_if_destroy_session_done(struct iscsi_cls_conn *conn) | |
862 | { | |
863 | struct iscsi_internal *priv; | |
864 | struct iscsi_cls_session *session; | |
865 | struct Scsi_Host *shost; | |
866 | struct iscsi_uevent *ev; | |
867 | struct sk_buff *skb; | |
868 | struct nlmsghdr *nlh; | |
869 | unsigned long flags; | |
870 | int rc, len = NLMSG_SPACE(sizeof(*ev)); | |
871 | ||
872 | priv = iscsi_if_transport_lookup(conn->transport); | |
873 | if (!priv) | |
874 | return -EINVAL; | |
875 | ||
876 | session = iscsi_dev_to_session(conn->dev.parent); | |
877 | shost = iscsi_session_to_shost(session); | |
878 | ||
879 | mempool_zone_complete(conn->z_pdu); | |
880 | ||
881 | skb = mempool_zone_get_skb(conn->z_pdu); | |
882 | if (!skb) { | |
883 | dev_printk(KERN_ERR, &conn->dev, "Cannot notify userspace of " | |
884 | "session creation event\n"); | |
885 | return -ENOMEM; | |
886 | } | |
887 | ||
888 | nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0); | |
889 | ev = NLMSG_DATA(nlh); | |
890 | ev->transport_handle = iscsi_handle(conn->transport); | |
891 | ev->type = ISCSI_KEVENT_DESTROY_SESSION; | |
892 | ev->r.d_session.host_no = shost->host_no; | |
893 | ev->r.d_session.sid = session->sid; | |
894 | ||
895 | /* | |
896 | * this will occur if the daemon is not up, so we just warn | |
897 | * the user and when the daemon is restarted it will handle it | |
898 | */ | |
9aaa2b46 | 899 | rc = iscsi_broadcast_skb(conn->z_pdu, skb, GFP_KERNEL); |
53cb8a1f MC |
900 | if (rc < 0) |
901 | dev_printk(KERN_ERR, &conn->dev, "Cannot notify userspace of " | |
902 | "session destruction event. Check iscsi daemon\n"); | |
903 | ||
904 | spin_lock_irqsave(&sesslock, flags); | |
905 | list_del(&session->sess_list); | |
906 | spin_unlock_irqrestore(&sesslock, flags); | |
907 | ||
908 | spin_lock_irqsave(&connlock, flags); | |
909 | conn->active = 0; | |
910 | list_del(&conn->conn_list); | |
911 | spin_unlock_irqrestore(&connlock, flags); | |
912 | ||
913 | return rc; | |
914 | } | |
915 | EXPORT_SYMBOL_GPL(iscsi_if_destroy_session_done); | |
916 | ||
917 | /** | |
918 | * iscsi_if_create_session_done - send session creation completion event | |
919 | * @conn: leading connection for session | |
920 | * | |
921 | * This is called by HW iscsi LLDs to notify userpsace that its HW has | |
922 | * created a session or a existing session is back in the logged in state. | |
923 | **/ | |
924 | int iscsi_if_create_session_done(struct iscsi_cls_conn *conn) | |
925 | { | |
926 | struct iscsi_internal *priv; | |
927 | struct iscsi_cls_session *session; | |
928 | struct Scsi_Host *shost; | |
929 | struct iscsi_uevent *ev; | |
930 | struct sk_buff *skb; | |
931 | struct nlmsghdr *nlh; | |
932 | unsigned long flags; | |
933 | int rc, len = NLMSG_SPACE(sizeof(*ev)); | |
934 | ||
935 | priv = iscsi_if_transport_lookup(conn->transport); | |
936 | if (!priv) | |
937 | return -EINVAL; | |
938 | ||
939 | session = iscsi_dev_to_session(conn->dev.parent); | |
940 | shost = iscsi_session_to_shost(session); | |
941 | ||
942 | mempool_zone_complete(conn->z_pdu); | |
943 | ||
944 | skb = mempool_zone_get_skb(conn->z_pdu); | |
945 | if (!skb) { | |
946 | dev_printk(KERN_ERR, &conn->dev, "Cannot notify userspace of " | |
947 | "session creation event\n"); | |
948 | return -ENOMEM; | |
949 | } | |
950 | ||
951 | nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0); | |
952 | ev = NLMSG_DATA(nlh); | |
953 | ev->transport_handle = iscsi_handle(conn->transport); | |
954 | ev->type = ISCSI_UEVENT_CREATE_SESSION; | |
955 | ev->r.c_session_ret.host_no = shost->host_no; | |
956 | ev->r.c_session_ret.sid = session->sid; | |
957 | ||
958 | /* | |
959 | * this will occur if the daemon is not up, so we just warn | |
960 | * the user and when the daemon is restarted it will handle it | |
961 | */ | |
9aaa2b46 | 962 | rc = iscsi_broadcast_skb(conn->z_pdu, skb, GFP_KERNEL); |
53cb8a1f MC |
963 | if (rc < 0) |
964 | dev_printk(KERN_ERR, &conn->dev, "Cannot notify userspace of " | |
965 | "session creation event. Check iscsi daemon\n"); | |
966 | ||
967 | spin_lock_irqsave(&sesslock, flags); | |
968 | list_add(&session->sess_list, &sesslist); | |
969 | spin_unlock_irqrestore(&sesslock, flags); | |
970 | ||
971 | spin_lock_irqsave(&connlock, flags); | |
972 | list_add(&conn->conn_list, &connlist); | |
973 | conn->active = 1; | |
974 | spin_unlock_irqrestore(&connlock, flags); | |
975 | return rc; | |
976 | } | |
977 | EXPORT_SYMBOL_GPL(iscsi_if_create_session_done); | |
978 | ||
0896b752 AA |
979 | static int |
980 | iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_uevent *ev) | |
981 | { | |
982 | struct iscsi_transport *transport = priv->iscsi_transport; | |
7b7232f3 | 983 | struct iscsi_cls_session *session; |
7996a778 | 984 | unsigned long flags; |
b5c7a12d | 985 | uint32_t hostno; |
0896b752 | 986 | |
7996a778 | 987 | session = transport->create_session(transport, &priv->t, |
7b7232f3 | 988 | ev->u.c_session.initial_cmdsn, |
b5c7a12d | 989 | &hostno); |
7b7232f3 | 990 | if (!session) |
7b8631b5 | 991 | return -ENOMEM; |
0896b752 | 992 | |
7996a778 MC |
993 | spin_lock_irqsave(&sesslock, flags); |
994 | list_add(&session->sess_list, &sesslist); | |
995 | spin_unlock_irqrestore(&sesslock, flags); | |
996 | ||
b5c7a12d MC |
997 | ev->r.c_session_ret.host_no = hostno; |
998 | ev->r.c_session_ret.sid = session->sid; | |
0896b752 | 999 | return 0; |
0896b752 AA |
1000 | } |
1001 | ||
1002 | static int | |
7b7232f3 | 1003 | iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev) |
0896b752 | 1004 | { |
7b8631b5 | 1005 | struct iscsi_cls_conn *conn; |
7b7232f3 | 1006 | struct iscsi_cls_session *session; |
0896b752 | 1007 | unsigned long flags; |
7b8631b5 | 1008 | |
b5c7a12d MC |
1009 | session = iscsi_session_lookup(ev->u.c_conn.sid); |
1010 | if (!session) { | |
1011 | printk(KERN_ERR "iscsi: invalid session %d\n", | |
1012 | ev->u.c_conn.sid); | |
7b8631b5 | 1013 | return -EINVAL; |
b5c7a12d | 1014 | } |
0896b752 | 1015 | |
7b7232f3 | 1016 | conn = transport->create_conn(session, ev->u.c_conn.cid); |
b5c7a12d MC |
1017 | if (!conn) { |
1018 | printk(KERN_ERR "iscsi: couldn't create a new " | |
1019 | "connection for session %d\n", | |
1020 | session->sid); | |
7b7232f3 | 1021 | return -ENOMEM; |
b5c7a12d | 1022 | } |
0896b752 | 1023 | |
b5c7a12d MC |
1024 | ev->r.c_conn_ret.sid = session->sid; |
1025 | ev->r.c_conn_ret.cid = conn->cid; | |
0896b752 AA |
1026 | |
1027 | spin_lock_irqsave(&connlock, flags); | |
1028 | list_add(&conn->conn_list, &connlist); | |
0896b752 AA |
1029 | conn->active = 1; |
1030 | spin_unlock_irqrestore(&connlock, flags); | |
1031 | ||
0896b752 | 1032 | return 0; |
1da177e4 LT |
1033 | } |
1034 | ||
0896b752 AA |
1035 | static int |
1036 | iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev) | |
1037 | { | |
1038 | unsigned long flags; | |
7b8631b5 | 1039 | struct iscsi_cls_conn *conn; |
0896b752 | 1040 | |
b5c7a12d | 1041 | conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid); |
0896b752 | 1042 | if (!conn) |
7b8631b5 | 1043 | return -EINVAL; |
0896b752 AA |
1044 | spin_lock_irqsave(&connlock, flags); |
1045 | conn->active = 0; | |
1046 | list_del(&conn->conn_list); | |
1047 | spin_unlock_irqrestore(&connlock, flags); | |
1048 | ||
7b8631b5 MC |
1049 | if (transport->destroy_conn) |
1050 | transport->destroy_conn(conn); | |
7b8631b5 | 1051 | return 0; |
0896b752 AA |
1052 | } |
1053 | ||
fd7255f5 MC |
1054 | static int |
1055 | iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev) | |
1056 | { | |
1057 | char *data = (char*)ev + sizeof(*ev); | |
1058 | struct iscsi_cls_conn *conn; | |
1059 | struct iscsi_cls_session *session; | |
a54a52ca | 1060 | int err = 0, value = 0; |
fd7255f5 MC |
1061 | |
1062 | session = iscsi_session_lookup(ev->u.set_param.sid); | |
1063 | conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid); | |
1064 | if (!conn || !session) | |
1065 | return -EINVAL; | |
1066 | ||
1067 | switch (ev->u.set_param.param) { | |
30a6c652 | 1068 | case ISCSI_PARAM_SESS_RECOVERY_TMO: |
a54a52ca | 1069 | sscanf(data, "%d", &value); |
30a6c652 MC |
1070 | if (value != 0) |
1071 | session->recovery_tmo = value; | |
1072 | break; | |
fd7255f5 | 1073 | default: |
a54a52ca MC |
1074 | err = transport->set_param(conn, ev->u.set_param.param, |
1075 | data, ev->u.set_param.len); | |
fd7255f5 MC |
1076 | } |
1077 | ||
1078 | return err; | |
1079 | } | |
1080 | ||
264faaaa OG |
1081 | static int |
1082 | iscsi_if_transport_ep(struct iscsi_transport *transport, | |
1083 | struct iscsi_uevent *ev, int msg_type) | |
1084 | { | |
1085 | struct sockaddr *dst_addr; | |
1086 | int rc = 0; | |
1087 | ||
1088 | switch (msg_type) { | |
1089 | case ISCSI_UEVENT_TRANSPORT_EP_CONNECT: | |
1090 | if (!transport->ep_connect) | |
1091 | return -EINVAL; | |
1092 | ||
1093 | dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev)); | |
1094 | rc = transport->ep_connect(dst_addr, | |
1095 | ev->u.ep_connect.non_blocking, | |
1096 | &ev->r.ep_connect_ret.handle); | |
1097 | break; | |
1098 | case ISCSI_UEVENT_TRANSPORT_EP_POLL: | |
1099 | if (!transport->ep_poll) | |
1100 | return -EINVAL; | |
1101 | ||
1102 | ev->r.retcode = transport->ep_poll(ev->u.ep_poll.ep_handle, | |
1103 | ev->u.ep_poll.timeout_ms); | |
1104 | break; | |
1105 | case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT: | |
1106 | if (!transport->ep_disconnect) | |
1107 | return -EINVAL; | |
1108 | ||
1109 | transport->ep_disconnect(ev->u.ep_disconnect.ep_handle); | |
1110 | break; | |
1111 | } | |
1112 | return rc; | |
1113 | } | |
1114 | ||
01cb225d MC |
1115 | static int |
1116 | iscsi_tgt_dscvr(struct iscsi_transport *transport, | |
1117 | struct iscsi_uevent *ev) | |
1118 | { | |
1119 | struct sockaddr *dst_addr; | |
1120 | ||
1121 | if (!transport->tgt_dscvr) | |
1122 | return -EINVAL; | |
1123 | ||
1124 | dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev)); | |
1125 | return transport->tgt_dscvr(ev->u.tgt_dscvr.type, | |
1126 | ev->u.tgt_dscvr.host_no, | |
1127 | ev->u.tgt_dscvr.enable, dst_addr); | |
1128 | } | |
1129 | ||
0896b752 AA |
1130 | static int |
1131 | iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) | |
1132 | { | |
1133 | int err = 0; | |
1134 | struct iscsi_uevent *ev = NLMSG_DATA(nlh); | |
1135 | struct iscsi_transport *transport = NULL; | |
1136 | struct iscsi_internal *priv; | |
7b7232f3 MC |
1137 | struct iscsi_cls_session *session; |
1138 | struct iscsi_cls_conn *conn; | |
7996a778 | 1139 | unsigned long flags; |
0896b752 | 1140 | |
0896b752 AA |
1141 | priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle)); |
1142 | if (!priv) | |
1143 | return -EINVAL; | |
1144 | transport = priv->iscsi_transport; | |
1145 | ||
7b7232f3 MC |
1146 | if (!try_module_get(transport->owner)) |
1147 | return -EINVAL; | |
1148 | ||
790f39a2 MC |
1149 | priv->daemon_pid = NETLINK_CREDS(skb)->pid; |
1150 | ||
0896b752 AA |
1151 | switch (nlh->nlmsg_type) { |
1152 | case ISCSI_UEVENT_CREATE_SESSION: | |
1153 | err = iscsi_if_create_session(priv, ev); | |
1154 | break; | |
1155 | case ISCSI_UEVENT_DESTROY_SESSION: | |
b5c7a12d | 1156 | session = iscsi_session_lookup(ev->u.d_session.sid); |
7996a778 MC |
1157 | if (session) { |
1158 | spin_lock_irqsave(&sesslock, flags); | |
1159 | list_del(&session->sess_list); | |
1160 | spin_unlock_irqrestore(&sesslock, flags); | |
1161 | ||
7b7232f3 | 1162 | transport->destroy_session(session); |
7996a778 | 1163 | } else |
7b7232f3 | 1164 | err = -EINVAL; |
0896b752 AA |
1165 | break; |
1166 | case ISCSI_UEVENT_CREATE_CONN: | |
1167 | err = iscsi_if_create_conn(transport, ev); | |
1168 | break; | |
1169 | case ISCSI_UEVENT_DESTROY_CONN: | |
1170 | err = iscsi_if_destroy_conn(transport, ev); | |
1171 | break; | |
1172 | case ISCSI_UEVENT_BIND_CONN: | |
b5c7a12d MC |
1173 | session = iscsi_session_lookup(ev->u.b_conn.sid); |
1174 | conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid); | |
7b7232f3 MC |
1175 | |
1176 | if (session && conn) | |
1177 | ev->r.retcode = transport->bind_conn(session, conn, | |
264faaaa | 1178 | ev->u.b_conn.transport_eph, |
7b7232f3 MC |
1179 | ev->u.b_conn.is_leading); |
1180 | else | |
1181 | err = -EINVAL; | |
0896b752 AA |
1182 | break; |
1183 | case ISCSI_UEVENT_SET_PARAM: | |
fd7255f5 | 1184 | err = iscsi_set_param(transport, ev); |
0896b752 AA |
1185 | break; |
1186 | case ISCSI_UEVENT_START_CONN: | |
b5c7a12d | 1187 | conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid); |
7b7232f3 MC |
1188 | if (conn) |
1189 | ev->r.retcode = transport->start_conn(conn); | |
1190 | else | |
1191 | err = -EINVAL; | |
0896b752 AA |
1192 | break; |
1193 | case ISCSI_UEVENT_STOP_CONN: | |
b5c7a12d | 1194 | conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid); |
7b7232f3 MC |
1195 | if (conn) |
1196 | transport->stop_conn(conn, ev->u.stop_conn.flag); | |
1197 | else | |
1198 | err = -EINVAL; | |
0896b752 AA |
1199 | break; |
1200 | case ISCSI_UEVENT_SEND_PDU: | |
b5c7a12d | 1201 | conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid); |
7b7232f3 MC |
1202 | if (conn) |
1203 | ev->r.retcode = transport->send_pdu(conn, | |
1204 | (struct iscsi_hdr*)((char*)ev + sizeof(*ev)), | |
1205 | (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size, | |
1206 | ev->u.send_pdu.data_size); | |
1207 | else | |
1208 | err = -EINVAL; | |
0896b752 AA |
1209 | break; |
1210 | case ISCSI_UEVENT_GET_STATS: | |
5b940adf | 1211 | err = iscsi_if_get_stats(transport, nlh); |
0896b752 | 1212 | break; |
264faaaa OG |
1213 | case ISCSI_UEVENT_TRANSPORT_EP_CONNECT: |
1214 | case ISCSI_UEVENT_TRANSPORT_EP_POLL: | |
1215 | case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT: | |
1216 | err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type); | |
1217 | break; | |
01cb225d MC |
1218 | case ISCSI_UEVENT_TGT_DSCVR: |
1219 | err = iscsi_tgt_dscvr(transport, ev); | |
1220 | break; | |
0896b752 AA |
1221 | default: |
1222 | err = -EINVAL; | |
1223 | break; | |
1224 | } | |
1225 | ||
7b7232f3 | 1226 | module_put(transport->owner); |
0896b752 AA |
1227 | return err; |
1228 | } | |
1229 | ||
b5c7a12d MC |
1230 | /* |
1231 | * Get message from skb (based on rtnetlink_rcv_skb). Each message is | |
1232 | * processed by iscsi_if_recv_msg. Malformed skbs with wrong lengths or | |
1233 | * invalid creds are discarded silently. | |
1234 | */ | |
0896b752 AA |
1235 | static void |
1236 | iscsi_if_rx(struct sock *sk, int len) | |
1237 | { | |
1238 | struct sk_buff *skb; | |
1da177e4 | 1239 | |
0b950672 | 1240 | mutex_lock(&rx_queue_mutex); |
0896b752 | 1241 | while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { |
ee7f8e40 MC |
1242 | if (NETLINK_CREDS(skb)->uid) { |
1243 | skb_pull(skb, skb->len); | |
1244 | goto free_skb; | |
1245 | } | |
ee7f8e40 | 1246 | |
0896b752 AA |
1247 | while (skb->len >= NLMSG_SPACE(0)) { |
1248 | int err; | |
1249 | uint32_t rlen; | |
1250 | struct nlmsghdr *nlh; | |
1251 | struct iscsi_uevent *ev; | |
1252 | ||
1253 | nlh = (struct nlmsghdr *)skb->data; | |
1254 | if (nlh->nlmsg_len < sizeof(*nlh) || | |
1255 | skb->len < nlh->nlmsg_len) { | |
1256 | break; | |
1257 | } | |
ee7f8e40 | 1258 | |
0896b752 AA |
1259 | ev = NLMSG_DATA(nlh); |
1260 | rlen = NLMSG_ALIGN(nlh->nlmsg_len); | |
1261 | if (rlen > skb->len) | |
1262 | rlen = skb->len; | |
ee7f8e40 | 1263 | |
0896b752 AA |
1264 | err = iscsi_if_recv_msg(skb, nlh); |
1265 | if (err) { | |
1266 | ev->type = ISCSI_KEVENT_IF_ERROR; | |
1267 | ev->iferror = err; | |
1268 | } | |
1269 | do { | |
1270 | /* | |
1271 | * special case for GET_STATS: | |
1272 | * on success - sending reply and stats from | |
1273 | * inside of if_recv_msg(), | |
1274 | * on error - fall through. | |
1275 | */ | |
1276 | if (ev->type == ISCSI_UEVENT_GET_STATS && !err) | |
1277 | break; | |
1278 | err = iscsi_if_send_reply( | |
1279 | NETLINK_CREDS(skb)->pid, nlh->nlmsg_seq, | |
1280 | nlh->nlmsg_type, 0, 0, ev, sizeof(*ev)); | |
7b8631b5 MC |
1281 | if (atomic_read(&z_reply->allocated) >= |
1282 | z_reply->hiwat) | |
0896b752 AA |
1283 | ev->iferror = -ENOMEM; |
1284 | } while (err < 0 && err != -ECONNREFUSED); | |
1285 | skb_pull(skb, rlen); | |
1286 | } | |
ee7f8e40 | 1287 | free_skb: |
0896b752 AA |
1288 | kfree_skb(skb); |
1289 | } | |
0b950672 | 1290 | mutex_unlock(&rx_queue_mutex); |
0896b752 | 1291 | } |
1da177e4 | 1292 | |
7b8631b5 MC |
1293 | #define iscsi_cdev_to_conn(_cdev) \ |
1294 | iscsi_dev_to_conn(_cdev->dev) | |
1295 | ||
fd7255f5 MC |
1296 | #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \ |
1297 | struct class_device_attribute class_device_attr_##_prefix##_##_name = \ | |
1298 | __ATTR(_name,_mode,_show,_store) | |
1299 | ||
1da177e4 | 1300 | /* |
0896b752 | 1301 | * iSCSI connection attrs |
1da177e4 | 1302 | */ |
a54a52ca | 1303 | #define iscsi_conn_attr_show(param) \ |
0896b752 | 1304 | static ssize_t \ |
a54a52ca | 1305 | show_conn_param_##param(struct class_device *cdev, char *buf) \ |
0896b752 | 1306 | { \ |
7b8631b5 MC |
1307 | struct iscsi_cls_conn *conn = iscsi_cdev_to_conn(cdev); \ |
1308 | struct iscsi_transport *t = conn->transport; \ | |
a54a52ca | 1309 | return t->get_conn_param(conn, param, buf); \ |
0896b752 AA |
1310 | } |
1311 | ||
a54a52ca MC |
1312 | #define iscsi_conn_attr(field, param) \ |
1313 | iscsi_conn_attr_show(param) \ | |
1314 | static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param, \ | |
fd7255f5 | 1315 | NULL); |
0896b752 | 1316 | |
a54a52ca MC |
1317 | iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH); |
1318 | iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH); | |
1319 | iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN); | |
1320 | iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN); | |
1321 | iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN); | |
1322 | iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN); | |
1323 | iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT); | |
1324 | iscsi_conn_attr(port, ISCSI_PARAM_CONN_PORT); | |
1325 | iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN); | |
1326 | iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS); | |
1327 | iscsi_conn_attr(address, ISCSI_PARAM_CONN_ADDRESS); | |
1da177e4 | 1328 | |
7b8631b5 MC |
1329 | #define iscsi_cdev_to_session(_cdev) \ |
1330 | iscsi_dev_to_session(_cdev->dev) | |
1331 | ||
1da177e4 | 1332 | /* |
0896b752 | 1333 | * iSCSI session attrs |
1da177e4 | 1334 | */ |
a54a52ca | 1335 | #define iscsi_session_attr_show(param) \ |
fd7255f5 | 1336 | static ssize_t \ |
a54a52ca | 1337 | show_session_param_##param(struct class_device *cdev, char *buf) \ |
fd7255f5 MC |
1338 | { \ |
1339 | struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev); \ | |
1340 | struct iscsi_transport *t = session->transport; \ | |
a54a52ca | 1341 | return t->get_session_param(session, param, buf); \ |
fd7255f5 MC |
1342 | } |
1343 | ||
a54a52ca MC |
1344 | #define iscsi_session_attr(field, param) \ |
1345 | iscsi_session_attr_show(param) \ | |
1346 | static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \ | |
fd7255f5 MC |
1347 | NULL); |
1348 | ||
a54a52ca MC |
1349 | iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME); |
1350 | iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN); | |
1351 | iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T); | |
1352 | iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN); | |
1353 | iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST); | |
1354 | iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST); | |
1355 | iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN); | |
1356 | iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN); | |
1357 | iscsi_session_attr(erl, ISCSI_PARAM_ERL); | |
1358 | iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT); | |
1da177e4 | 1359 | |
fd7255f5 MC |
1360 | #define iscsi_priv_session_attr_show(field, format) \ |
1361 | static ssize_t \ | |
a54a52ca | 1362 | show_priv_session_##field(struct class_device *cdev, char *buf) \ |
fd7255f5 | 1363 | { \ |
a54a52ca | 1364 | struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev);\ |
fd7255f5 MC |
1365 | return sprintf(buf, format"\n", session->field); \ |
1366 | } | |
1367 | ||
1368 | #define iscsi_priv_session_attr(field, format) \ | |
1369 | iscsi_priv_session_attr_show(field, format) \ | |
1370 | static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO, show_priv_session_##field, \ | |
1371 | NULL) | |
30a6c652 | 1372 | iscsi_priv_session_attr(recovery_tmo, "%d"); |
fd7255f5 | 1373 | |
fd7255f5 MC |
1374 | #define SETUP_PRIV_SESSION_RD_ATTR(field) \ |
1375 | do { \ | |
1376 | priv->session_attrs[count] = &class_device_attr_priv_sess_##field; \ | |
1377 | count++; \ | |
1378 | } while (0) | |
1379 | ||
a54a52ca | 1380 | |
fd7255f5 MC |
1381 | #define SETUP_SESSION_RD_ATTR(field, param_flag) \ |
1382 | do { \ | |
1383 | if (tt->param_mask & param_flag) { \ | |
1384 | priv->session_attrs[count] = &class_device_attr_sess_##field; \ | |
1da177e4 | 1385 | count++; \ |
fd7255f5 MC |
1386 | } \ |
1387 | } while (0) | |
1388 | ||
fd7255f5 MC |
1389 | #define SETUP_CONN_RD_ATTR(field, param_flag) \ |
1390 | do { \ | |
1391 | if (tt->param_mask & param_flag) { \ | |
1392 | priv->conn_attrs[count] = &class_device_attr_conn_##field; \ | |
1393 | count++; \ | |
1394 | } \ | |
1395 | } while (0) | |
1da177e4 | 1396 | |
0896b752 AA |
1397 | static int iscsi_session_match(struct attribute_container *cont, |
1398 | struct device *dev) | |
1da177e4 | 1399 | { |
7b8631b5 | 1400 | struct iscsi_cls_session *session; |
1da177e4 | 1401 | struct Scsi_Host *shost; |
0896b752 AA |
1402 | struct iscsi_internal *priv; |
1403 | ||
1404 | if (!iscsi_is_session_dev(dev)) | |
1405 | return 0; | |
1da177e4 | 1406 | |
7b8631b5 MC |
1407 | session = iscsi_dev_to_session(dev); |
1408 | shost = iscsi_session_to_shost(session); | |
0896b752 | 1409 | if (!shost->transportt) |
1da177e4 LT |
1410 | return 0; |
1411 | ||
0896b752 AA |
1412 | priv = to_iscsi_internal(shost->transportt); |
1413 | if (priv->session_cont.ac.class != &iscsi_session_class.class) | |
1da177e4 LT |
1414 | return 0; |
1415 | ||
0896b752 | 1416 | return &priv->session_cont.ac == cont; |
1da177e4 LT |
1417 | } |
1418 | ||
0896b752 AA |
1419 | static int iscsi_conn_match(struct attribute_container *cont, |
1420 | struct device *dev) | |
1421 | { | |
7b8631b5 MC |
1422 | struct iscsi_cls_session *session; |
1423 | struct iscsi_cls_conn *conn; | |
1da177e4 | 1424 | struct Scsi_Host *shost; |
0896b752 | 1425 | struct iscsi_internal *priv; |
1da177e4 | 1426 | |
0896b752 | 1427 | if (!iscsi_is_conn_dev(dev)) |
1da177e4 LT |
1428 | return 0; |
1429 | ||
7b8631b5 MC |
1430 | conn = iscsi_dev_to_conn(dev); |
1431 | session = iscsi_dev_to_session(conn->dev.parent); | |
1432 | shost = iscsi_session_to_shost(session); | |
1433 | ||
0896b752 | 1434 | if (!shost->transportt) |
1da177e4 LT |
1435 | return 0; |
1436 | ||
0896b752 AA |
1437 | priv = to_iscsi_internal(shost->transportt); |
1438 | if (priv->conn_cont.ac.class != &iscsi_connection_class.class) | |
1439 | return 0; | |
1da177e4 | 1440 | |
0896b752 AA |
1441 | return &priv->conn_cont.ac == cont; |
1442 | } | |
1443 | ||
30a6c652 MC |
1444 | static int iscsi_host_match(struct attribute_container *cont, |
1445 | struct device *dev) | |
1446 | { | |
1447 | struct Scsi_Host *shost; | |
1448 | struct iscsi_internal *priv; | |
1449 | ||
1450 | if (!scsi_is_host_device(dev)) | |
1451 | return 0; | |
1452 | ||
1453 | shost = dev_to_shost(dev); | |
1454 | if (!shost->transportt || | |
1455 | shost->transportt->host_attrs.ac.class != &iscsi_host_class.class) | |
1456 | return 0; | |
1457 | ||
1458 | priv = to_iscsi_internal(shost->transportt); | |
1459 | return &priv->t.host_attrs.ac == cont; | |
1460 | } | |
1461 | ||
7b8631b5 MC |
1462 | struct scsi_transport_template * |
1463 | iscsi_register_transport(struct iscsi_transport *tt) | |
0896b752 AA |
1464 | { |
1465 | struct iscsi_internal *priv; | |
1466 | unsigned long flags; | |
1467 | int count = 0, err; | |
1468 | ||
1469 | BUG_ON(!tt); | |
1470 | ||
1471 | priv = iscsi_if_transport_lookup(tt); | |
1472 | if (priv) | |
7b8631b5 | 1473 | return NULL; |
0896b752 | 1474 | |
24669f75 | 1475 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
0896b752 | 1476 | if (!priv) |
7b8631b5 | 1477 | return NULL; |
0896b752 | 1478 | INIT_LIST_HEAD(&priv->list); |
53cb8a1f | 1479 | priv->daemon_pid = -1; |
0896b752 | 1480 | priv->iscsi_transport = tt; |
30a6c652 | 1481 | priv->t.user_scan = iscsi_user_scan; |
0896b752 AA |
1482 | |
1483 | priv->cdev.class = &iscsi_transport_class; | |
1484 | snprintf(priv->cdev.class_id, BUS_ID_SIZE, "%s", tt->name); | |
1485 | err = class_device_register(&priv->cdev); | |
1486 | if (err) | |
1487 | goto free_priv; | |
1488 | ||
1489 | err = sysfs_create_group(&priv->cdev.kobj, &iscsi_transport_group); | |
1490 | if (err) | |
1491 | goto unregister_cdev; | |
1492 | ||
30a6c652 MC |
1493 | /* host parameters */ |
1494 | priv->t.host_attrs.ac.attrs = &priv->host_attrs[0]; | |
1495 | priv->t.host_attrs.ac.class = &iscsi_host_class.class; | |
1496 | priv->t.host_attrs.ac.match = iscsi_host_match; | |
1497 | priv->t.host_size = sizeof(struct iscsi_host); | |
1498 | priv->host_attrs[0] = NULL; | |
1499 | transport_container_register(&priv->t.host_attrs); | |
1500 | ||
0896b752 AA |
1501 | /* connection parameters */ |
1502 | priv->conn_cont.ac.attrs = &priv->conn_attrs[0]; | |
1503 | priv->conn_cont.ac.class = &iscsi_connection_class.class; | |
1504 | priv->conn_cont.ac.match = iscsi_conn_match; | |
1505 | transport_container_register(&priv->conn_cont); | |
1da177e4 | 1506 | |
fd7255f5 MC |
1507 | SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_MAX_RECV_DLENGTH); |
1508 | SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_MAX_XMIT_DLENGTH); | |
1509 | SETUP_CONN_RD_ATTR(header_digest, ISCSI_HDRDGST_EN); | |
1510 | SETUP_CONN_RD_ATTR(data_digest, ISCSI_DATADGST_EN); | |
1511 | SETUP_CONN_RD_ATTR(ifmarker, ISCSI_IFMARKER_EN); | |
1512 | SETUP_CONN_RD_ATTR(ofmarker, ISCSI_OFMARKER_EN); | |
1513 | SETUP_CONN_RD_ATTR(address, ISCSI_CONN_ADDRESS); | |
1514 | SETUP_CONN_RD_ATTR(port, ISCSI_CONN_PORT); | |
8d2860b3 | 1515 | SETUP_CONN_RD_ATTR(exp_statsn, ISCSI_EXP_STATSN); |
a54a52ca MC |
1516 | SETUP_CONN_RD_ATTR(persistent_address, ISCSI_PERSISTENT_ADDRESS); |
1517 | SETUP_CONN_RD_ATTR(persistent_port, ISCSI_PERSISTENT_PORT); | |
0896b752 AA |
1518 | |
1519 | BUG_ON(count > ISCSI_CONN_ATTRS); | |
1520 | priv->conn_attrs[count] = NULL; | |
1da177e4 | 1521 | count = 0; |
1da177e4 | 1522 | |
0896b752 AA |
1523 | /* session parameters */ |
1524 | priv->session_cont.ac.attrs = &priv->session_attrs[0]; | |
1525 | priv->session_cont.ac.class = &iscsi_session_class.class; | |
1526 | priv->session_cont.ac.match = iscsi_session_match; | |
1527 | transport_container_register(&priv->session_cont); | |
1528 | ||
fd7255f5 MC |
1529 | SETUP_SESSION_RD_ATTR(initial_r2t, ISCSI_INITIAL_R2T_EN); |
1530 | SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_MAX_R2T); | |
1531 | SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_IMM_DATA_EN); | |
1532 | SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_FIRST_BURST); | |
1533 | SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_MAX_BURST); | |
1534 | SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PDU_INORDER_EN); | |
1535 | SETUP_SESSION_RD_ATTR(data_seq_in_order, ISCSI_DATASEQ_INORDER_EN); | |
1536 | SETUP_SESSION_RD_ATTR(erl, ISCSI_ERL); | |
a54a52ca MC |
1537 | SETUP_SESSION_RD_ATTR(targetname, ISCSI_TARGET_NAME); |
1538 | SETUP_SESSION_RD_ATTR(tpgt, ISCSI_TPGT); | |
30a6c652 | 1539 | SETUP_PRIV_SESSION_RD_ATTR(recovery_tmo); |
fd7255f5 | 1540 | |
0896b752 AA |
1541 | BUG_ON(count > ISCSI_SESSION_ATTRS); |
1542 | priv->session_attrs[count] = NULL; | |
1543 | ||
1544 | spin_lock_irqsave(&iscsi_transport_lock, flags); | |
1545 | list_add(&priv->list, &iscsi_transports); | |
1546 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
1547 | ||
1548 | printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name); | |
7b8631b5 | 1549 | return &priv->t; |
1da177e4 | 1550 | |
0896b752 AA |
1551 | unregister_cdev: |
1552 | class_device_unregister(&priv->cdev); | |
1553 | free_priv: | |
1554 | kfree(priv); | |
7b8631b5 | 1555 | return NULL; |
1da177e4 | 1556 | } |
0896b752 AA |
1557 | EXPORT_SYMBOL_GPL(iscsi_register_transport); |
1558 | ||
1559 | int iscsi_unregister_transport(struct iscsi_transport *tt) | |
1560 | { | |
1561 | struct iscsi_internal *priv; | |
1562 | unsigned long flags; | |
1563 | ||
1564 | BUG_ON(!tt); | |
1565 | ||
0b950672 | 1566 | mutex_lock(&rx_queue_mutex); |
0896b752 AA |
1567 | |
1568 | priv = iscsi_if_transport_lookup(tt); | |
1569 | BUG_ON (!priv); | |
1570 | ||
0896b752 AA |
1571 | spin_lock_irqsave(&iscsi_transport_lock, flags); |
1572 | list_del(&priv->list); | |
1573 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
1574 | ||
1575 | transport_container_unregister(&priv->conn_cont); | |
1576 | transport_container_unregister(&priv->session_cont); | |
30a6c652 | 1577 | transport_container_unregister(&priv->t.host_attrs); |
0896b752 AA |
1578 | |
1579 | sysfs_remove_group(&priv->cdev.kobj, &iscsi_transport_group); | |
1580 | class_device_unregister(&priv->cdev); | |
0b950672 | 1581 | mutex_unlock(&rx_queue_mutex); |
1da177e4 | 1582 | |
0896b752 AA |
1583 | return 0; |
1584 | } | |
1585 | EXPORT_SYMBOL_GPL(iscsi_unregister_transport); | |
1da177e4 | 1586 | |
0896b752 AA |
1587 | static int |
1588 | iscsi_rcv_nl_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1da177e4 | 1589 | { |
0896b752 AA |
1590 | struct netlink_notify *n = ptr; |
1591 | ||
1592 | if (event == NETLINK_URELEASE && | |
1593 | n->protocol == NETLINK_ISCSI && n->pid) { | |
7b8631b5 | 1594 | struct iscsi_cls_conn *conn; |
0896b752 AA |
1595 | unsigned long flags; |
1596 | ||
7b8631b5 | 1597 | mempool_zone_complete(z_reply); |
0896b752 AA |
1598 | spin_lock_irqsave(&connlock, flags); |
1599 | list_for_each_entry(conn, &connlist, conn_list) { | |
7b8631b5 MC |
1600 | mempool_zone_complete(conn->z_error); |
1601 | mempool_zone_complete(conn->z_pdu); | |
0896b752 AA |
1602 | } |
1603 | spin_unlock_irqrestore(&connlock, flags); | |
1604 | } | |
1da177e4 | 1605 | |
0896b752 | 1606 | return NOTIFY_DONE; |
1da177e4 LT |
1607 | } |
1608 | ||
0896b752 AA |
1609 | static struct notifier_block iscsi_nl_notifier = { |
1610 | .notifier_call = iscsi_rcv_nl_event, | |
1611 | }; | |
1da177e4 LT |
1612 | |
1613 | static __init int iscsi_transport_init(void) | |
1614 | { | |
0896b752 | 1615 | int err; |
1da177e4 | 1616 | |
f4246b33 MC |
1617 | printk(KERN_INFO "Loading iSCSI transport class v%s.", |
1618 | ISCSI_TRANSPORT_VERSION); | |
1619 | ||
0896b752 | 1620 | err = class_register(&iscsi_transport_class); |
1da177e4 LT |
1621 | if (err) |
1622 | return err; | |
0896b752 | 1623 | |
30a6c652 | 1624 | err = transport_class_register(&iscsi_host_class); |
0896b752 AA |
1625 | if (err) |
1626 | goto unregister_transport_class; | |
1627 | ||
30a6c652 MC |
1628 | err = transport_class_register(&iscsi_connection_class); |
1629 | if (err) | |
1630 | goto unregister_host_class; | |
1631 | ||
0896b752 AA |
1632 | err = transport_class_register(&iscsi_session_class); |
1633 | if (err) | |
1634 | goto unregister_conn_class; | |
1635 | ||
1636 | err = netlink_register_notifier(&iscsi_nl_notifier); | |
1637 | if (err) | |
1638 | goto unregister_session_class; | |
1639 | ||
2290d2b6 | 1640 | nls = netlink_kernel_create(NETLINK_ISCSI, 1, iscsi_if_rx, |
7b8631b5 | 1641 | THIS_MODULE); |
0896b752 AA |
1642 | if (!nls) { |
1643 | err = -ENOBUFS; | |
1644 | goto unregister_notifier; | |
1645 | } | |
1646 | ||
7b8631b5 | 1647 | z_reply = mempool_zone_init(Z_MAX_REPLY, |
0896b752 | 1648 | NLMSG_SPACE(sizeof(struct iscsi_uevent)), Z_HIWAT_REPLY); |
7b8631b5 | 1649 | if (z_reply) |
0896b752 AA |
1650 | return 0; |
1651 | ||
1652 | sock_release(nls->sk_socket); | |
1653 | unregister_notifier: | |
1654 | netlink_unregister_notifier(&iscsi_nl_notifier); | |
1655 | unregister_session_class: | |
1656 | transport_class_unregister(&iscsi_session_class); | |
1657 | unregister_conn_class: | |
1658 | transport_class_unregister(&iscsi_connection_class); | |
30a6c652 MC |
1659 | unregister_host_class: |
1660 | transport_class_unregister(&iscsi_host_class); | |
0896b752 AA |
1661 | unregister_transport_class: |
1662 | class_unregister(&iscsi_transport_class); | |
1663 | return err; | |
1da177e4 LT |
1664 | } |
1665 | ||
1666 | static void __exit iscsi_transport_exit(void) | |
1667 | { | |
7b8631b5 | 1668 | mempool_zone_destroy(z_reply); |
0896b752 AA |
1669 | sock_release(nls->sk_socket); |
1670 | netlink_unregister_notifier(&iscsi_nl_notifier); | |
1671 | transport_class_unregister(&iscsi_connection_class); | |
1672 | transport_class_unregister(&iscsi_session_class); | |
30a6c652 | 1673 | transport_class_unregister(&iscsi_host_class); |
0896b752 | 1674 | class_unregister(&iscsi_transport_class); |
1da177e4 LT |
1675 | } |
1676 | ||
1677 | module_init(iscsi_transport_init); | |
1678 | module_exit(iscsi_transport_exit); | |
1679 | ||
0896b752 AA |
1680 | MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, " |
1681 | "Dmitry Yusupov <dmitry_yus@yahoo.com>, " | |
1682 | "Alex Aizman <itn780@yahoo.com>"); | |
1683 | MODULE_DESCRIPTION("iSCSI Transport Interface"); | |
1da177e4 | 1684 | MODULE_LICENSE("GPL"); |
f4246b33 | 1685 | MODULE_VERSION(ISCSI_TRANSPORT_VERSION); |