Commit | Line | Data |
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0896b752 | 1 | /* |
1da177e4 LT |
2 | * iSCSI transport class definitions |
3 | * | |
4 | * Copyright (C) IBM Corporation, 2004 | |
0896b752 AA |
5 | * Copyright (C) Mike Christie, 2004 - 2005 |
6 | * Copyright (C) Dmitry Yusupov, 2004 - 2005 | |
7 | * Copyright (C) Alex Aizman, 2004 - 2005 | |
1da177e4 LT |
8 | * |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to the Free Software | |
21 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
22 | */ | |
23 | #include <linux/module.h> | |
0896b752 | 24 | #include <linux/mempool.h> |
0b950672 | 25 | #include <linux/mutex.h> |
0896b752 | 26 | #include <net/tcp.h> |
1da177e4 LT |
27 | #include <scsi/scsi.h> |
28 | #include <scsi/scsi_host.h> | |
29 | #include <scsi/scsi_device.h> | |
30 | #include <scsi/scsi_transport.h> | |
31 | #include <scsi/scsi_transport_iscsi.h> | |
0896b752 | 32 | #include <scsi/iscsi_if.h> |
1da177e4 | 33 | |
30a6c652 | 34 | #define ISCSI_SESSION_ATTRS 11 |
8d2860b3 | 35 | #define ISCSI_CONN_ATTRS 11 |
30a6c652 | 36 | #define ISCSI_HOST_ATTRS 0 |
1da177e4 LT |
37 | |
38 | struct iscsi_internal { | |
790f39a2 | 39 | int daemon_pid; |
1da177e4 | 40 | struct scsi_transport_template t; |
0896b752 AA |
41 | struct iscsi_transport *iscsi_transport; |
42 | struct list_head list; | |
0896b752 | 43 | struct class_device cdev; |
30a6c652 MC |
44 | |
45 | struct class_device_attribute *host_attrs[ISCSI_HOST_ATTRS + 1]; | |
0896b752 AA |
46 | struct transport_container conn_cont; |
47 | struct class_device_attribute *conn_attrs[ISCSI_CONN_ATTRS + 1]; | |
48 | struct transport_container session_cont; | |
1da177e4 | 49 | struct class_device_attribute *session_attrs[ISCSI_SESSION_ATTRS + 1]; |
1da177e4 LT |
50 | }; |
51 | ||
b5c7a12d MC |
52 | static int iscsi_session_nr; /* sysfs session id for next new session */ |
53 | ||
0896b752 AA |
54 | /* |
55 | * list of registered transports and lock that must | |
56 | * be held while accessing list. The iscsi_transport_lock must | |
0b950672 | 57 | * be acquired after the rx_queue_mutex. |
0896b752 AA |
58 | */ |
59 | static LIST_HEAD(iscsi_transports); | |
60 | static DEFINE_SPINLOCK(iscsi_transport_lock); | |
61 | ||
62 | #define to_iscsi_internal(tmpl) \ | |
63 | container_of(tmpl, struct iscsi_internal, t) | |
64 | ||
65 | #define cdev_to_iscsi_internal(_cdev) \ | |
66 | container_of(_cdev, struct iscsi_internal, cdev) | |
67 | ||
68 | static void iscsi_transport_release(struct class_device *cdev) | |
69 | { | |
70 | struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev); | |
71 | kfree(priv); | |
72 | } | |
1da177e4 | 73 | |
0896b752 AA |
74 | /* |
75 | * iscsi_transport_class represents the iscsi_transports that are | |
76 | * registered. | |
77 | */ | |
78 | static struct class iscsi_transport_class = { | |
79 | .name = "iscsi_transport", | |
80 | .release = iscsi_transport_release, | |
81 | }; | |
82 | ||
83 | static ssize_t | |
84 | show_transport_handle(struct class_device *cdev, char *buf) | |
85 | { | |
86 | struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev); | |
762e2bfa | 87 | return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport)); |
0896b752 AA |
88 | } |
89 | static CLASS_DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL); | |
90 | ||
91 | #define show_transport_attr(name, format) \ | |
92 | static ssize_t \ | |
93 | show_transport_##name(struct class_device *cdev, char *buf) \ | |
94 | { \ | |
95 | struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev); \ | |
96 | return sprintf(buf, format"\n", priv->iscsi_transport->name); \ | |
97 | } \ | |
98 | static CLASS_DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL); | |
99 | ||
100 | show_transport_attr(caps, "0x%x"); | |
101 | show_transport_attr(max_lun, "%d"); | |
102 | show_transport_attr(max_conn, "%d"); | |
103 | show_transport_attr(max_cmd_len, "%d"); | |
104 | ||
105 | static struct attribute *iscsi_transport_attrs[] = { | |
106 | &class_device_attr_handle.attr, | |
107 | &class_device_attr_caps.attr, | |
108 | &class_device_attr_max_lun.attr, | |
109 | &class_device_attr_max_conn.attr, | |
110 | &class_device_attr_max_cmd_len.attr, | |
111 | NULL, | |
112 | }; | |
113 | ||
114 | static struct attribute_group iscsi_transport_group = { | |
115 | .attrs = iscsi_transport_attrs, | |
116 | }; | |
117 | ||
30a6c652 MC |
118 | static int iscsi_setup_host(struct transport_container *tc, struct device *dev, |
119 | struct class_device *cdev) | |
120 | { | |
121 | struct Scsi_Host *shost = dev_to_shost(dev); | |
122 | struct iscsi_host *ihost = shost->shost_data; | |
123 | ||
124 | memset(ihost, 0, sizeof(*ihost)); | |
125 | INIT_LIST_HEAD(&ihost->sessions); | |
126 | mutex_init(&ihost->mutex); | |
127 | return 0; | |
128 | } | |
129 | ||
130 | static DECLARE_TRANSPORT_CLASS(iscsi_host_class, | |
131 | "iscsi_host", | |
132 | iscsi_setup_host, | |
133 | NULL, | |
134 | NULL); | |
135 | ||
0896b752 AA |
136 | static DECLARE_TRANSPORT_CLASS(iscsi_session_class, |
137 | "iscsi_session", | |
1da177e4 LT |
138 | NULL, |
139 | NULL, | |
140 | NULL); | |
141 | ||
0896b752 AA |
142 | static DECLARE_TRANSPORT_CLASS(iscsi_connection_class, |
143 | "iscsi_connection", | |
1da177e4 LT |
144 | NULL, |
145 | NULL, | |
146 | NULL); | |
0896b752 AA |
147 | |
148 | static struct sock *nls; | |
0b950672 | 149 | static DEFINE_MUTEX(rx_queue_mutex); |
0896b752 AA |
150 | |
151 | struct mempool_zone { | |
152 | mempool_t *pool; | |
153 | atomic_t allocated; | |
154 | int size; | |
155 | int hiwat; | |
156 | struct list_head freequeue; | |
157 | spinlock_t freelock; | |
158 | }; | |
159 | ||
7b8631b5 | 160 | static struct mempool_zone *z_reply; |
0896b752 | 161 | |
1da177e4 | 162 | /* |
0896b752 AA |
163 | * Z_MAX_* - actual mempool size allocated at the mempool_zone_init() time |
164 | * Z_HIWAT_* - zone's high watermark when if_error bit will be set to -ENOMEM | |
165 | * so daemon will notice OOM on NETLINK tranposrt level and will | |
166 | * be able to predict or change operational behavior | |
1da177e4 | 167 | */ |
0896b752 AA |
168 | #define Z_MAX_REPLY 8 |
169 | #define Z_HIWAT_REPLY 6 | |
170 | #define Z_MAX_PDU 8 | |
171 | #define Z_HIWAT_PDU 6 | |
172 | #define Z_MAX_ERROR 16 | |
173 | #define Z_HIWAT_ERROR 12 | |
174 | ||
7b7232f3 MC |
175 | static LIST_HEAD(sesslist); |
176 | static DEFINE_SPINLOCK(sesslock); | |
7b8631b5 MC |
177 | static LIST_HEAD(connlist); |
178 | static DEFINE_SPINLOCK(connlock); | |
0896b752 | 179 | |
b5c7a12d MC |
180 | static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn) |
181 | { | |
182 | struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent); | |
183 | return sess->sid; | |
184 | } | |
185 | ||
186 | /* | |
187 | * Returns the matching session to a given sid | |
188 | */ | |
189 | static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid) | |
7b7232f3 MC |
190 | { |
191 | unsigned long flags; | |
192 | struct iscsi_cls_session *sess; | |
193 | ||
194 | spin_lock_irqsave(&sesslock, flags); | |
195 | list_for_each_entry(sess, &sesslist, sess_list) { | |
b5c7a12d | 196 | if (sess->sid == sid) { |
7b7232f3 MC |
197 | spin_unlock_irqrestore(&sesslock, flags); |
198 | return sess; | |
199 | } | |
200 | } | |
201 | spin_unlock_irqrestore(&sesslock, flags); | |
202 | return NULL; | |
203 | } | |
204 | ||
b5c7a12d MC |
205 | /* |
206 | * Returns the matching connection to a given sid / cid tuple | |
207 | */ | |
208 | static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid) | |
7b7232f3 MC |
209 | { |
210 | unsigned long flags; | |
211 | struct iscsi_cls_conn *conn; | |
212 | ||
213 | spin_lock_irqsave(&connlock, flags); | |
214 | list_for_each_entry(conn, &connlist, conn_list) { | |
b5c7a12d | 215 | if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) { |
7b7232f3 MC |
216 | spin_unlock_irqrestore(&connlock, flags); |
217 | return conn; | |
218 | } | |
219 | } | |
220 | spin_unlock_irqrestore(&connlock, flags); | |
221 | return NULL; | |
222 | } | |
223 | ||
7b8631b5 MC |
224 | /* |
225 | * The following functions can be used by LLDs that allocate | |
226 | * their own scsi_hosts or by software iscsi LLDs | |
227 | */ | |
228 | static void iscsi_session_release(struct device *dev) | |
229 | { | |
230 | struct iscsi_cls_session *session = iscsi_dev_to_session(dev); | |
7b8631b5 | 231 | struct Scsi_Host *shost; |
0896b752 | 232 | |
7b8631b5 MC |
233 | shost = iscsi_session_to_shost(session); |
234 | scsi_host_put(shost); | |
235 | kfree(session); | |
7b8631b5 | 236 | } |
0896b752 | 237 | |
7b8631b5 MC |
238 | static int iscsi_is_session_dev(const struct device *dev) |
239 | { | |
240 | return dev->release == iscsi_session_release; | |
241 | } | |
0896b752 | 242 | |
30a6c652 MC |
243 | static int iscsi_user_scan(struct Scsi_Host *shost, uint channel, |
244 | uint id, uint lun) | |
245 | { | |
246 | struct iscsi_host *ihost = shost->shost_data; | |
247 | struct iscsi_cls_session *session; | |
248 | ||
249 | mutex_lock(&ihost->mutex); | |
250 | list_for_each_entry(session, &ihost->sessions, host_list) { | |
e6f3b63f | 251 | if ((channel == SCAN_WILD_CARD || channel == 0) && |
30a6c652 | 252 | (id == SCAN_WILD_CARD || id == session->target_id)) |
e6f3b63f | 253 | scsi_scan_target(&session->dev, 0, |
30a6c652 MC |
254 | session->target_id, lun, 1); |
255 | } | |
256 | mutex_unlock(&ihost->mutex); | |
257 | ||
258 | return 0; | |
259 | } | |
260 | ||
261 | static void session_recovery_timedout(void *data) | |
262 | { | |
263 | struct iscsi_cls_session *session = data; | |
264 | ||
be2df72e OG |
265 | dev_printk(KERN_INFO, &session->dev, "iscsi: session recovery timed " |
266 | "out after %d secs\n", session->recovery_tmo); | |
30a6c652 MC |
267 | |
268 | if (session->transport->session_recovery_timedout) | |
269 | session->transport->session_recovery_timedout(session); | |
270 | ||
271 | scsi_target_unblock(&session->dev); | |
272 | } | |
273 | ||
274 | void iscsi_unblock_session(struct iscsi_cls_session *session) | |
275 | { | |
276 | if (!cancel_delayed_work(&session->recovery_work)) | |
277 | flush_scheduled_work(); | |
278 | scsi_target_unblock(&session->dev); | |
279 | } | |
280 | EXPORT_SYMBOL_GPL(iscsi_unblock_session); | |
281 | ||
282 | void iscsi_block_session(struct iscsi_cls_session *session) | |
283 | { | |
284 | scsi_target_block(&session->dev); | |
285 | schedule_delayed_work(&session->recovery_work, | |
286 | session->recovery_tmo * HZ); | |
287 | } | |
288 | EXPORT_SYMBOL_GPL(iscsi_block_session); | |
289 | ||
7b8631b5 | 290 | struct iscsi_cls_session * |
8434aa8b MC |
291 | iscsi_alloc_session(struct Scsi_Host *shost, |
292 | struct iscsi_transport *transport) | |
7b8631b5 MC |
293 | { |
294 | struct iscsi_cls_session *session; | |
7b8631b5 | 295 | |
b5c7a12d MC |
296 | session = kzalloc(sizeof(*session) + transport->sessiondata_size, |
297 | GFP_KERNEL); | |
7b8631b5 | 298 | if (!session) |
f53a88da MC |
299 | return NULL; |
300 | ||
7b8631b5 | 301 | session->transport = transport; |
30a6c652 MC |
302 | session->recovery_tmo = 120; |
303 | INIT_WORK(&session->recovery_work, session_recovery_timedout, session); | |
304 | INIT_LIST_HEAD(&session->host_list); | |
305 | INIT_LIST_HEAD(&session->sess_list); | |
7b8631b5 | 306 | |
6a8a0d36 MC |
307 | /* this is released in the dev's release function */ |
308 | scsi_host_get(shost); | |
8434aa8b MC |
309 | session->dev.parent = &shost->shost_gendev; |
310 | session->dev.release = iscsi_session_release; | |
311 | device_initialize(&session->dev); | |
b5c7a12d MC |
312 | if (transport->sessiondata_size) |
313 | session->dd_data = &session[1]; | |
8434aa8b MC |
314 | return session; |
315 | } | |
316 | EXPORT_SYMBOL_GPL(iscsi_alloc_session); | |
317 | ||
6a8a0d36 | 318 | int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id) |
8434aa8b MC |
319 | { |
320 | struct Scsi_Host *shost = iscsi_session_to_shost(session); | |
321 | struct iscsi_host *ihost; | |
322 | int err; | |
b5c7a12d | 323 | |
30a6c652 | 324 | ihost = shost->shost_data; |
b5c7a12d | 325 | session->sid = iscsi_session_nr++; |
6a8a0d36 | 326 | session->target_id = target_id; |
30a6c652 | 327 | |
b5c7a12d MC |
328 | snprintf(session->dev.bus_id, BUS_ID_SIZE, "session%u", |
329 | session->sid); | |
8434aa8b | 330 | err = device_add(&session->dev); |
7b8631b5 MC |
331 | if (err) { |
332 | dev_printk(KERN_ERR, &session->dev, "iscsi: could not " | |
333 | "register session's dev\n"); | |
8434aa8b | 334 | goto release_host; |
7b8631b5 MC |
335 | } |
336 | transport_register_device(&session->dev); | |
337 | ||
30a6c652 MC |
338 | mutex_lock(&ihost->mutex); |
339 | list_add(&session->host_list, &ihost->sessions); | |
340 | mutex_unlock(&ihost->mutex); | |
8434aa8b | 341 | return 0; |
30a6c652 | 342 | |
8434aa8b MC |
343 | release_host: |
344 | scsi_host_put(shost); | |
345 | return err; | |
7b8631b5 | 346 | } |
8434aa8b | 347 | EXPORT_SYMBOL_GPL(iscsi_add_session); |
7b8631b5 MC |
348 | |
349 | /** | |
8434aa8b MC |
350 | * iscsi_create_session - create iscsi class session |
351 | * @shost: scsi host | |
352 | * @transport: iscsi transport | |
7b8631b5 | 353 | * |
8434aa8b | 354 | * This can be called from a LLD or iscsi_transport. |
7b8631b5 | 355 | **/ |
8434aa8b MC |
356 | struct iscsi_cls_session * |
357 | iscsi_create_session(struct Scsi_Host *shost, | |
6a8a0d36 MC |
358 | struct iscsi_transport *transport, |
359 | unsigned int target_id) | |
8434aa8b MC |
360 | { |
361 | struct iscsi_cls_session *session; | |
362 | ||
363 | session = iscsi_alloc_session(shost, transport); | |
364 | if (!session) | |
365 | return NULL; | |
366 | ||
6a8a0d36 | 367 | if (iscsi_add_session(session, target_id)) { |
8434aa8b MC |
368 | iscsi_free_session(session); |
369 | return NULL; | |
370 | } | |
371 | return session; | |
372 | } | |
373 | EXPORT_SYMBOL_GPL(iscsi_create_session); | |
374 | ||
375 | void iscsi_remove_session(struct iscsi_cls_session *session) | |
7b8631b5 | 376 | { |
30a6c652 MC |
377 | struct Scsi_Host *shost = iscsi_session_to_shost(session); |
378 | struct iscsi_host *ihost = shost->shost_data; | |
379 | ||
380 | if (!cancel_delayed_work(&session->recovery_work)) | |
381 | flush_scheduled_work(); | |
382 | ||
383 | mutex_lock(&ihost->mutex); | |
384 | list_del(&session->host_list); | |
385 | mutex_unlock(&ihost->mutex); | |
386 | ||
8434aa8b MC |
387 | scsi_remove_target(&session->dev); |
388 | ||
7b8631b5 | 389 | transport_unregister_device(&session->dev); |
8434aa8b MC |
390 | device_del(&session->dev); |
391 | } | |
392 | EXPORT_SYMBOL_GPL(iscsi_remove_session); | |
393 | ||
394 | void iscsi_free_session(struct iscsi_cls_session *session) | |
395 | { | |
396 | put_device(&session->dev); | |
7b8631b5 MC |
397 | } |
398 | ||
8434aa8b MC |
399 | EXPORT_SYMBOL_GPL(iscsi_free_session); |
400 | ||
401 | /** | |
402 | * iscsi_destroy_session - destroy iscsi session | |
403 | * @session: iscsi_session | |
404 | * | |
405 | * Can be called by a LLD or iscsi_transport. There must not be | |
406 | * any running connections. | |
407 | **/ | |
408 | int iscsi_destroy_session(struct iscsi_cls_session *session) | |
409 | { | |
410 | iscsi_remove_session(session); | |
411 | iscsi_free_session(session); | |
412 | return 0; | |
413 | } | |
7b8631b5 MC |
414 | EXPORT_SYMBOL_GPL(iscsi_destroy_session); |
415 | ||
53cb8a1f MC |
416 | static void mempool_zone_destroy(struct mempool_zone *zp) |
417 | { | |
418 | mempool_destroy(zp->pool); | |
419 | kfree(zp); | |
420 | } | |
421 | ||
422 | static void* | |
423 | mempool_zone_alloc_skb(gfp_t gfp_mask, void *pool_data) | |
424 | { | |
425 | struct mempool_zone *zone = pool_data; | |
426 | ||
427 | return alloc_skb(zone->size, gfp_mask); | |
428 | } | |
429 | ||
430 | static void | |
431 | mempool_zone_free_skb(void *element, void *pool_data) | |
432 | { | |
433 | kfree_skb(element); | |
434 | } | |
435 | ||
436 | static struct mempool_zone * | |
437 | mempool_zone_init(unsigned max, unsigned size, unsigned hiwat) | |
438 | { | |
439 | struct mempool_zone *zp; | |
440 | ||
441 | zp = kzalloc(sizeof(*zp), GFP_KERNEL); | |
442 | if (!zp) | |
443 | return NULL; | |
444 | ||
445 | zp->size = size; | |
446 | zp->hiwat = hiwat; | |
447 | INIT_LIST_HEAD(&zp->freequeue); | |
448 | spin_lock_init(&zp->freelock); | |
449 | atomic_set(&zp->allocated, 0); | |
450 | ||
451 | zp->pool = mempool_create(max, mempool_zone_alloc_skb, | |
452 | mempool_zone_free_skb, zp); | |
453 | if (!zp->pool) { | |
454 | kfree(zp); | |
455 | return NULL; | |
456 | } | |
457 | ||
458 | return zp; | |
459 | } | |
460 | ||
7b8631b5 MC |
461 | static void iscsi_conn_release(struct device *dev) |
462 | { | |
463 | struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev); | |
464 | struct device *parent = conn->dev.parent; | |
465 | ||
53cb8a1f MC |
466 | mempool_zone_destroy(conn->z_pdu); |
467 | mempool_zone_destroy(conn->z_error); | |
468 | ||
7b8631b5 MC |
469 | kfree(conn); |
470 | put_device(parent); | |
471 | } | |
472 | ||
473 | static int iscsi_is_conn_dev(const struct device *dev) | |
474 | { | |
475 | return dev->release == iscsi_conn_release; | |
476 | } | |
477 | ||
53cb8a1f MC |
478 | static int iscsi_create_event_pools(struct iscsi_cls_conn *conn) |
479 | { | |
480 | conn->z_pdu = mempool_zone_init(Z_MAX_PDU, | |
481 | NLMSG_SPACE(sizeof(struct iscsi_uevent) + | |
482 | sizeof(struct iscsi_hdr) + | |
483 | DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH), | |
484 | Z_HIWAT_PDU); | |
485 | if (!conn->z_pdu) { | |
486 | dev_printk(KERN_ERR, &conn->dev, "iscsi: can not allocate " | |
487 | "pdu zone for new conn\n"); | |
488 | return -ENOMEM; | |
489 | } | |
490 | ||
491 | conn->z_error = mempool_zone_init(Z_MAX_ERROR, | |
492 | NLMSG_SPACE(sizeof(struct iscsi_uevent)), | |
493 | Z_HIWAT_ERROR); | |
494 | if (!conn->z_error) { | |
495 | dev_printk(KERN_ERR, &conn->dev, "iscsi: can not allocate " | |
496 | "error zone for new conn\n"); | |
497 | mempool_zone_destroy(conn->z_pdu); | |
498 | return -ENOMEM; | |
499 | } | |
500 | return 0; | |
501 | } | |
502 | ||
7b8631b5 MC |
503 | /** |
504 | * iscsi_create_conn - create iscsi class connection | |
505 | * @session: iscsi cls session | |
506 | * @cid: connection id | |
507 | * | |
508 | * This can be called from a LLD or iscsi_transport. The connection | |
509 | * is child of the session so cid must be unique for all connections | |
510 | * on the session. | |
b5c7a12d MC |
511 | * |
512 | * Since we do not support MCS, cid will normally be zero. In some cases | |
513 | * for software iscsi we could be trying to preallocate a connection struct | |
514 | * in which case there could be two connection structs and cid would be | |
515 | * non-zero. | |
7b8631b5 MC |
516 | **/ |
517 | struct iscsi_cls_conn * | |
518 | iscsi_create_conn(struct iscsi_cls_session *session, uint32_t cid) | |
519 | { | |
520 | struct iscsi_transport *transport = session->transport; | |
7b8631b5 MC |
521 | struct iscsi_cls_conn *conn; |
522 | int err; | |
523 | ||
524 | conn = kzalloc(sizeof(*conn) + transport->conndata_size, GFP_KERNEL); | |
525 | if (!conn) | |
526 | return NULL; | |
527 | ||
528 | if (transport->conndata_size) | |
529 | conn->dd_data = &conn[1]; | |
530 | ||
531 | INIT_LIST_HEAD(&conn->conn_list); | |
532 | conn->transport = transport; | |
b5c7a12d | 533 | conn->cid = cid; |
7b8631b5 | 534 | |
53cb8a1f MC |
535 | if (iscsi_create_event_pools(conn)) |
536 | goto free_conn; | |
537 | ||
7b8631b5 MC |
538 | /* this is released in the dev's release function */ |
539 | if (!get_device(&session->dev)) | |
53cb8a1f | 540 | goto free_conn_pools; |
b5c7a12d | 541 | |
7b8631b5 | 542 | snprintf(conn->dev.bus_id, BUS_ID_SIZE, "connection%d:%u", |
b5c7a12d | 543 | session->sid, cid); |
7b8631b5 MC |
544 | conn->dev.parent = &session->dev; |
545 | conn->dev.release = iscsi_conn_release; | |
546 | err = device_register(&conn->dev); | |
547 | if (err) { | |
548 | dev_printk(KERN_ERR, &conn->dev, "iscsi: could not register " | |
549 | "connection's dev\n"); | |
550 | goto release_parent_ref; | |
551 | } | |
552 | transport_register_device(&conn->dev); | |
553 | return conn; | |
554 | ||
555 | release_parent_ref: | |
556 | put_device(&session->dev); | |
53cb8a1f MC |
557 | free_conn_pools: |
558 | ||
7b8631b5 MC |
559 | free_conn: |
560 | kfree(conn); | |
561 | return NULL; | |
562 | } | |
563 | ||
564 | EXPORT_SYMBOL_GPL(iscsi_create_conn); | |
565 | ||
566 | /** | |
567 | * iscsi_destroy_conn - destroy iscsi class connection | |
568 | * @session: iscsi cls session | |
569 | * | |
570 | * This can be called from a LLD or iscsi_transport. | |
571 | **/ | |
572 | int iscsi_destroy_conn(struct iscsi_cls_conn *conn) | |
573 | { | |
574 | transport_unregister_device(&conn->dev); | |
575 | device_unregister(&conn->dev); | |
576 | return 0; | |
577 | } | |
578 | ||
579 | EXPORT_SYMBOL_GPL(iscsi_destroy_conn); | |
580 | ||
7b8631b5 MC |
581 | /* |
582 | * iscsi interface functions | |
583 | */ | |
0896b752 AA |
584 | static struct iscsi_internal * |
585 | iscsi_if_transport_lookup(struct iscsi_transport *tt) | |
586 | { | |
587 | struct iscsi_internal *priv; | |
588 | unsigned long flags; | |
589 | ||
590 | spin_lock_irqsave(&iscsi_transport_lock, flags); | |
591 | list_for_each_entry(priv, &iscsi_transports, list) { | |
592 | if (tt == priv->iscsi_transport) { | |
593 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
594 | return priv; | |
595 | } | |
596 | } | |
597 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
598 | return NULL; | |
599 | } | |
1da177e4 | 600 | |
0896b752 AA |
601 | static inline struct list_head *skb_to_lh(struct sk_buff *skb) |
602 | { | |
603 | return (struct list_head *)&skb->cb; | |
604 | } | |
1da177e4 | 605 | |
0896b752 AA |
606 | static void |
607 | mempool_zone_complete(struct mempool_zone *zone) | |
608 | { | |
609 | unsigned long flags; | |
610 | struct list_head *lh, *n; | |
1da177e4 | 611 | |
0896b752 AA |
612 | spin_lock_irqsave(&zone->freelock, flags); |
613 | list_for_each_safe(lh, n, &zone->freequeue) { | |
614 | struct sk_buff *skb = (struct sk_buff *)((char *)lh - | |
615 | offsetof(struct sk_buff, cb)); | |
616 | if (!skb_shared(skb)) { | |
617 | list_del(skb_to_lh(skb)); | |
618 | mempool_free(skb, zone->pool); | |
619 | atomic_dec(&zone->allocated); | |
620 | } | |
621 | } | |
622 | spin_unlock_irqrestore(&zone->freelock, flags); | |
1da177e4 LT |
623 | } |
624 | ||
0896b752 AA |
625 | static struct sk_buff* |
626 | mempool_zone_get_skb(struct mempool_zone *zone) | |
1da177e4 | 627 | { |
0896b752 AA |
628 | struct sk_buff *skb; |
629 | ||
630 | skb = mempool_alloc(zone->pool, GFP_ATOMIC); | |
631 | if (skb) | |
632 | atomic_inc(&zone->allocated); | |
633 | return skb; | |
634 | } | |
1da177e4 | 635 | |
53cb8a1f MC |
636 | static int |
637 | iscsi_broadcast_skb(struct mempool_zone *zone, struct sk_buff *skb) | |
638 | { | |
639 | unsigned long flags; | |
640 | int rc; | |
641 | ||
642 | skb_get(skb); | |
643 | rc = netlink_broadcast(nls, skb, 0, 1, GFP_KERNEL); | |
644 | if (rc < 0) { | |
645 | mempool_free(skb, zone->pool); | |
646 | printk(KERN_ERR "iscsi: can not broadcast skb (%d)\n", rc); | |
647 | return rc; | |
648 | } | |
649 | ||
650 | spin_lock_irqsave(&zone->freelock, flags); | |
651 | INIT_LIST_HEAD(skb_to_lh(skb)); | |
652 | list_add(skb_to_lh(skb), &zone->freequeue); | |
653 | spin_unlock_irqrestore(&zone->freelock, flags); | |
654 | return 0; | |
655 | } | |
656 | ||
0896b752 | 657 | static int |
790f39a2 | 658 | iscsi_unicast_skb(struct mempool_zone *zone, struct sk_buff *skb, int pid) |
0896b752 AA |
659 | { |
660 | unsigned long flags; | |
661 | int rc; | |
1da177e4 | 662 | |
0896b752 | 663 | skb_get(skb); |
790f39a2 | 664 | rc = netlink_unicast(nls, skb, pid, MSG_DONTWAIT); |
0896b752 AA |
665 | if (rc < 0) { |
666 | mempool_free(skb, zone->pool); | |
667 | printk(KERN_ERR "iscsi: can not unicast skb (%d)\n", rc); | |
668 | return rc; | |
669 | } | |
670 | ||
671 | spin_lock_irqsave(&zone->freelock, flags); | |
30a6c652 | 672 | INIT_LIST_HEAD(skb_to_lh(skb)); |
0896b752 AA |
673 | list_add(skb_to_lh(skb), &zone->freequeue); |
674 | spin_unlock_irqrestore(&zone->freelock, flags); | |
675 | ||
676 | return 0; | |
1da177e4 | 677 | } |
1da177e4 | 678 | |
7b7232f3 | 679 | int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr, |
0896b752 | 680 | char *data, uint32_t data_size) |
1da177e4 | 681 | { |
0896b752 AA |
682 | struct nlmsghdr *nlh; |
683 | struct sk_buff *skb; | |
684 | struct iscsi_uevent *ev; | |
0896b752 | 685 | char *pdu; |
790f39a2 | 686 | struct iscsi_internal *priv; |
0896b752 AA |
687 | int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) + |
688 | data_size); | |
689 | ||
790f39a2 MC |
690 | priv = iscsi_if_transport_lookup(conn->transport); |
691 | if (!priv) | |
692 | return -EINVAL; | |
693 | ||
7b8631b5 | 694 | mempool_zone_complete(conn->z_pdu); |
0896b752 | 695 | |
7b8631b5 | 696 | skb = mempool_zone_get_skb(conn->z_pdu); |
0896b752 | 697 | if (!skb) { |
7b7232f3 | 698 | iscsi_conn_error(conn, ISCSI_ERR_CONN_FAILED); |
7b8631b5 MC |
699 | dev_printk(KERN_ERR, &conn->dev, "iscsi: can not deliver " |
700 | "control PDU: OOM\n"); | |
0896b752 AA |
701 | return -ENOMEM; |
702 | } | |
1da177e4 | 703 | |
790f39a2 | 704 | nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0); |
0896b752 AA |
705 | ev = NLMSG_DATA(nlh); |
706 | memset(ev, 0, sizeof(*ev)); | |
707 | ev->transport_handle = iscsi_handle(conn->transport); | |
708 | ev->type = ISCSI_KEVENT_RECV_PDU; | |
7b8631b5 | 709 | if (atomic_read(&conn->z_pdu->allocated) >= conn->z_pdu->hiwat) |
0896b752 | 710 | ev->iferror = -ENOMEM; |
b5c7a12d MC |
711 | ev->r.recv_req.cid = conn->cid; |
712 | ev->r.recv_req.sid = iscsi_conn_get_sid(conn); | |
0896b752 AA |
713 | pdu = (char*)ev + sizeof(*ev); |
714 | memcpy(pdu, hdr, sizeof(struct iscsi_hdr)); | |
715 | memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size); | |
1da177e4 | 716 | |
790f39a2 | 717 | return iscsi_unicast_skb(conn->z_pdu, skb, priv->daemon_pid); |
1da177e4 | 718 | } |
0896b752 | 719 | EXPORT_SYMBOL_GPL(iscsi_recv_pdu); |
1da177e4 | 720 | |
7b7232f3 | 721 | void iscsi_conn_error(struct iscsi_cls_conn *conn, enum iscsi_err error) |
1da177e4 | 722 | { |
0896b752 AA |
723 | struct nlmsghdr *nlh; |
724 | struct sk_buff *skb; | |
725 | struct iscsi_uevent *ev; | |
790f39a2 | 726 | struct iscsi_internal *priv; |
0896b752 AA |
727 | int len = NLMSG_SPACE(sizeof(*ev)); |
728 | ||
790f39a2 MC |
729 | priv = iscsi_if_transport_lookup(conn->transport); |
730 | if (!priv) | |
731 | return; | |
732 | ||
7b8631b5 | 733 | mempool_zone_complete(conn->z_error); |
0896b752 | 734 | |
7b8631b5 | 735 | skb = mempool_zone_get_skb(conn->z_error); |
0896b752 | 736 | if (!skb) { |
7b8631b5 MC |
737 | dev_printk(KERN_ERR, &conn->dev, "iscsi: gracefully ignored " |
738 | "conn error (%d)\n", error); | |
0896b752 AA |
739 | return; |
740 | } | |
741 | ||
790f39a2 | 742 | nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0); |
0896b752 AA |
743 | ev = NLMSG_DATA(nlh); |
744 | ev->transport_handle = iscsi_handle(conn->transport); | |
745 | ev->type = ISCSI_KEVENT_CONN_ERROR; | |
7b8631b5 | 746 | if (atomic_read(&conn->z_error->allocated) >= conn->z_error->hiwat) |
0896b752 AA |
747 | ev->iferror = -ENOMEM; |
748 | ev->r.connerror.error = error; | |
b5c7a12d MC |
749 | ev->r.connerror.cid = conn->cid; |
750 | ev->r.connerror.sid = iscsi_conn_get_sid(conn); | |
1da177e4 | 751 | |
53cb8a1f | 752 | iscsi_broadcast_skb(conn->z_error, skb); |
1da177e4 | 753 | |
7b8631b5 MC |
754 | dev_printk(KERN_INFO, &conn->dev, "iscsi: detected conn error (%d)\n", |
755 | error); | |
0896b752 AA |
756 | } |
757 | EXPORT_SYMBOL_GPL(iscsi_conn_error); | |
758 | ||
759 | static int | |
760 | iscsi_if_send_reply(int pid, int seq, int type, int done, int multi, | |
761 | void *payload, int size) | |
762 | { | |
763 | struct sk_buff *skb; | |
764 | struct nlmsghdr *nlh; | |
765 | int len = NLMSG_SPACE(size); | |
766 | int flags = multi ? NLM_F_MULTI : 0; | |
767 | int t = done ? NLMSG_DONE : type; | |
768 | ||
7b8631b5 | 769 | mempool_zone_complete(z_reply); |
0896b752 | 770 | |
7b8631b5 | 771 | skb = mempool_zone_get_skb(z_reply); |
0896b752 AA |
772 | /* |
773 | * FIXME: | |
774 | * user is supposed to react on iferror == -ENOMEM; | |
775 | * see iscsi_if_rx(). | |
776 | */ | |
777 | BUG_ON(!skb); | |
778 | ||
779 | nlh = __nlmsg_put(skb, pid, seq, t, (len - sizeof(*nlh)), 0); | |
780 | nlh->nlmsg_flags = flags; | |
781 | memcpy(NLMSG_DATA(nlh), payload, size); | |
790f39a2 | 782 | return iscsi_unicast_skb(z_reply, skb, pid); |
1da177e4 | 783 | } |
1da177e4 | 784 | |
7b8631b5 | 785 | static int |
5b940adf | 786 | iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh) |
7b8631b5 MC |
787 | { |
788 | struct iscsi_uevent *ev = NLMSG_DATA(nlh); | |
789 | struct iscsi_stats *stats; | |
790 | struct sk_buff *skbstat; | |
791 | struct iscsi_cls_conn *conn; | |
792 | struct nlmsghdr *nlhstat; | |
793 | struct iscsi_uevent *evstat; | |
790f39a2 | 794 | struct iscsi_internal *priv; |
7b8631b5 MC |
795 | int len = NLMSG_SPACE(sizeof(*ev) + |
796 | sizeof(struct iscsi_stats) + | |
797 | sizeof(struct iscsi_stats_custom) * | |
798 | ISCSI_STATS_CUSTOM_MAX); | |
799 | int err = 0; | |
0896b752 | 800 | |
790f39a2 MC |
801 | priv = iscsi_if_transport_lookup(transport); |
802 | if (!priv) | |
803 | return -EINVAL; | |
804 | ||
b5c7a12d | 805 | conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid); |
7b8631b5 MC |
806 | if (!conn) |
807 | return -EEXIST; | |
0896b752 | 808 | |
7b8631b5 MC |
809 | do { |
810 | int actual_size; | |
0896b752 | 811 | |
7b8631b5 | 812 | mempool_zone_complete(conn->z_pdu); |
0896b752 | 813 | |
7b8631b5 MC |
814 | skbstat = mempool_zone_get_skb(conn->z_pdu); |
815 | if (!skbstat) { | |
816 | dev_printk(KERN_ERR, &conn->dev, "iscsi: can not " | |
817 | "deliver stats: OOM\n"); | |
818 | return -ENOMEM; | |
819 | } | |
820 | ||
790f39a2 | 821 | nlhstat = __nlmsg_put(skbstat, priv->daemon_pid, 0, 0, |
7b8631b5 MC |
822 | (len - sizeof(*nlhstat)), 0); |
823 | evstat = NLMSG_DATA(nlhstat); | |
824 | memset(evstat, 0, sizeof(*evstat)); | |
825 | evstat->transport_handle = iscsi_handle(conn->transport); | |
826 | evstat->type = nlh->nlmsg_type; | |
827 | if (atomic_read(&conn->z_pdu->allocated) >= conn->z_pdu->hiwat) | |
828 | evstat->iferror = -ENOMEM; | |
b5c7a12d MC |
829 | evstat->u.get_stats.cid = |
830 | ev->u.get_stats.cid; | |
831 | evstat->u.get_stats.sid = | |
832 | ev->u.get_stats.sid; | |
7b8631b5 MC |
833 | stats = (struct iscsi_stats *) |
834 | ((char*)evstat + sizeof(*evstat)); | |
835 | memset(stats, 0, sizeof(*stats)); | |
836 | ||
7b7232f3 | 837 | transport->get_stats(conn, stats); |
7b8631b5 MC |
838 | actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) + |
839 | sizeof(struct iscsi_stats) + | |
840 | sizeof(struct iscsi_stats_custom) * | |
841 | stats->custom_length); | |
842 | actual_size -= sizeof(*nlhstat); | |
843 | actual_size = NLMSG_LENGTH(actual_size); | |
5b940adf | 844 | skb_trim(skbstat, NLMSG_ALIGN(actual_size)); |
7b8631b5 MC |
845 | nlhstat->nlmsg_len = actual_size; |
846 | ||
790f39a2 | 847 | err = iscsi_unicast_skb(conn->z_pdu, skbstat, priv->daemon_pid); |
7b8631b5 MC |
848 | } while (err < 0 && err != -ECONNREFUSED); |
849 | ||
850 | return err; | |
0896b752 AA |
851 | } |
852 | ||
53cb8a1f MC |
853 | /** |
854 | * iscsi_if_destroy_session_done - send session destr. completion event | |
855 | * @conn: last connection for session | |
856 | * | |
857 | * This is called by HW iscsi LLDs to notify userpsace that its HW has | |
858 | * removed a session. | |
859 | **/ | |
860 | int iscsi_if_destroy_session_done(struct iscsi_cls_conn *conn) | |
861 | { | |
862 | struct iscsi_internal *priv; | |
863 | struct iscsi_cls_session *session; | |
864 | struct Scsi_Host *shost; | |
865 | struct iscsi_uevent *ev; | |
866 | struct sk_buff *skb; | |
867 | struct nlmsghdr *nlh; | |
868 | unsigned long flags; | |
869 | int rc, len = NLMSG_SPACE(sizeof(*ev)); | |
870 | ||
871 | priv = iscsi_if_transport_lookup(conn->transport); | |
872 | if (!priv) | |
873 | return -EINVAL; | |
874 | ||
875 | session = iscsi_dev_to_session(conn->dev.parent); | |
876 | shost = iscsi_session_to_shost(session); | |
877 | ||
878 | mempool_zone_complete(conn->z_pdu); | |
879 | ||
880 | skb = mempool_zone_get_skb(conn->z_pdu); | |
881 | if (!skb) { | |
882 | dev_printk(KERN_ERR, &conn->dev, "Cannot notify userspace of " | |
883 | "session creation event\n"); | |
884 | return -ENOMEM; | |
885 | } | |
886 | ||
887 | nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0); | |
888 | ev = NLMSG_DATA(nlh); | |
889 | ev->transport_handle = iscsi_handle(conn->transport); | |
890 | ev->type = ISCSI_KEVENT_DESTROY_SESSION; | |
891 | ev->r.d_session.host_no = shost->host_no; | |
892 | ev->r.d_session.sid = session->sid; | |
893 | ||
894 | /* | |
895 | * this will occur if the daemon is not up, so we just warn | |
896 | * the user and when the daemon is restarted it will handle it | |
897 | */ | |
898 | rc = iscsi_broadcast_skb(conn->z_pdu, skb); | |
899 | if (rc < 0) | |
900 | dev_printk(KERN_ERR, &conn->dev, "Cannot notify userspace of " | |
901 | "session destruction event. Check iscsi daemon\n"); | |
902 | ||
903 | spin_lock_irqsave(&sesslock, flags); | |
904 | list_del(&session->sess_list); | |
905 | spin_unlock_irqrestore(&sesslock, flags); | |
906 | ||
907 | spin_lock_irqsave(&connlock, flags); | |
908 | conn->active = 0; | |
909 | list_del(&conn->conn_list); | |
910 | spin_unlock_irqrestore(&connlock, flags); | |
911 | ||
912 | return rc; | |
913 | } | |
914 | EXPORT_SYMBOL_GPL(iscsi_if_destroy_session_done); | |
915 | ||
916 | /** | |
917 | * iscsi_if_create_session_done - send session creation completion event | |
918 | * @conn: leading connection for session | |
919 | * | |
920 | * This is called by HW iscsi LLDs to notify userpsace that its HW has | |
921 | * created a session or a existing session is back in the logged in state. | |
922 | **/ | |
923 | int iscsi_if_create_session_done(struct iscsi_cls_conn *conn) | |
924 | { | |
925 | struct iscsi_internal *priv; | |
926 | struct iscsi_cls_session *session; | |
927 | struct Scsi_Host *shost; | |
928 | struct iscsi_uevent *ev; | |
929 | struct sk_buff *skb; | |
930 | struct nlmsghdr *nlh; | |
931 | unsigned long flags; | |
932 | int rc, len = NLMSG_SPACE(sizeof(*ev)); | |
933 | ||
934 | priv = iscsi_if_transport_lookup(conn->transport); | |
935 | if (!priv) | |
936 | return -EINVAL; | |
937 | ||
938 | session = iscsi_dev_to_session(conn->dev.parent); | |
939 | shost = iscsi_session_to_shost(session); | |
940 | ||
941 | mempool_zone_complete(conn->z_pdu); | |
942 | ||
943 | skb = mempool_zone_get_skb(conn->z_pdu); | |
944 | if (!skb) { | |
945 | dev_printk(KERN_ERR, &conn->dev, "Cannot notify userspace of " | |
946 | "session creation event\n"); | |
947 | return -ENOMEM; | |
948 | } | |
949 | ||
950 | nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0); | |
951 | ev = NLMSG_DATA(nlh); | |
952 | ev->transport_handle = iscsi_handle(conn->transport); | |
953 | ev->type = ISCSI_UEVENT_CREATE_SESSION; | |
954 | ev->r.c_session_ret.host_no = shost->host_no; | |
955 | ev->r.c_session_ret.sid = session->sid; | |
956 | ||
957 | /* | |
958 | * this will occur if the daemon is not up, so we just warn | |
959 | * the user and when the daemon is restarted it will handle it | |
960 | */ | |
961 | rc = iscsi_broadcast_skb(conn->z_pdu, skb); | |
962 | if (rc < 0) | |
963 | dev_printk(KERN_ERR, &conn->dev, "Cannot notify userspace of " | |
964 | "session creation event. Check iscsi daemon\n"); | |
965 | ||
966 | spin_lock_irqsave(&sesslock, flags); | |
967 | list_add(&session->sess_list, &sesslist); | |
968 | spin_unlock_irqrestore(&sesslock, flags); | |
969 | ||
970 | spin_lock_irqsave(&connlock, flags); | |
971 | list_add(&conn->conn_list, &connlist); | |
972 | conn->active = 1; | |
973 | spin_unlock_irqrestore(&connlock, flags); | |
974 | return rc; | |
975 | } | |
976 | EXPORT_SYMBOL_GPL(iscsi_if_create_session_done); | |
977 | ||
0896b752 AA |
978 | static int |
979 | iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_uevent *ev) | |
980 | { | |
981 | struct iscsi_transport *transport = priv->iscsi_transport; | |
7b7232f3 | 982 | struct iscsi_cls_session *session; |
7996a778 | 983 | unsigned long flags; |
b5c7a12d | 984 | uint32_t hostno; |
0896b752 | 985 | |
7996a778 | 986 | session = transport->create_session(transport, &priv->t, |
7b7232f3 | 987 | ev->u.c_session.initial_cmdsn, |
b5c7a12d | 988 | &hostno); |
7b7232f3 | 989 | if (!session) |
7b8631b5 | 990 | return -ENOMEM; |
0896b752 | 991 | |
7996a778 MC |
992 | spin_lock_irqsave(&sesslock, flags); |
993 | list_add(&session->sess_list, &sesslist); | |
994 | spin_unlock_irqrestore(&sesslock, flags); | |
995 | ||
b5c7a12d MC |
996 | ev->r.c_session_ret.host_no = hostno; |
997 | ev->r.c_session_ret.sid = session->sid; | |
0896b752 | 998 | return 0; |
0896b752 AA |
999 | } |
1000 | ||
1001 | static int | |
7b7232f3 | 1002 | iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev) |
0896b752 | 1003 | { |
7b8631b5 | 1004 | struct iscsi_cls_conn *conn; |
7b7232f3 | 1005 | struct iscsi_cls_session *session; |
0896b752 | 1006 | unsigned long flags; |
7b8631b5 | 1007 | |
b5c7a12d MC |
1008 | session = iscsi_session_lookup(ev->u.c_conn.sid); |
1009 | if (!session) { | |
1010 | printk(KERN_ERR "iscsi: invalid session %d\n", | |
1011 | ev->u.c_conn.sid); | |
7b8631b5 | 1012 | return -EINVAL; |
b5c7a12d | 1013 | } |
0896b752 | 1014 | |
7b7232f3 | 1015 | conn = transport->create_conn(session, ev->u.c_conn.cid); |
b5c7a12d MC |
1016 | if (!conn) { |
1017 | printk(KERN_ERR "iscsi: couldn't create a new " | |
1018 | "connection for session %d\n", | |
1019 | session->sid); | |
7b7232f3 | 1020 | return -ENOMEM; |
b5c7a12d | 1021 | } |
0896b752 | 1022 | |
b5c7a12d MC |
1023 | ev->r.c_conn_ret.sid = session->sid; |
1024 | ev->r.c_conn_ret.cid = conn->cid; | |
0896b752 AA |
1025 | |
1026 | spin_lock_irqsave(&connlock, flags); | |
1027 | list_add(&conn->conn_list, &connlist); | |
0896b752 AA |
1028 | conn->active = 1; |
1029 | spin_unlock_irqrestore(&connlock, flags); | |
1030 | ||
0896b752 | 1031 | return 0; |
1da177e4 LT |
1032 | } |
1033 | ||
0896b752 AA |
1034 | static int |
1035 | iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev) | |
1036 | { | |
1037 | unsigned long flags; | |
7b8631b5 | 1038 | struct iscsi_cls_conn *conn; |
0896b752 | 1039 | |
b5c7a12d | 1040 | conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid); |
0896b752 | 1041 | if (!conn) |
7b8631b5 | 1042 | return -EINVAL; |
0896b752 AA |
1043 | spin_lock_irqsave(&connlock, flags); |
1044 | conn->active = 0; | |
1045 | list_del(&conn->conn_list); | |
1046 | spin_unlock_irqrestore(&connlock, flags); | |
1047 | ||
7b8631b5 MC |
1048 | if (transport->destroy_conn) |
1049 | transport->destroy_conn(conn); | |
7b8631b5 | 1050 | return 0; |
0896b752 AA |
1051 | } |
1052 | ||
fd7255f5 MC |
1053 | static int |
1054 | iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev) | |
1055 | { | |
1056 | char *data = (char*)ev + sizeof(*ev); | |
1057 | struct iscsi_cls_conn *conn; | |
1058 | struct iscsi_cls_session *session; | |
a54a52ca | 1059 | int err = 0, value = 0; |
fd7255f5 MC |
1060 | |
1061 | session = iscsi_session_lookup(ev->u.set_param.sid); | |
1062 | conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid); | |
1063 | if (!conn || !session) | |
1064 | return -EINVAL; | |
1065 | ||
1066 | switch (ev->u.set_param.param) { | |
30a6c652 | 1067 | case ISCSI_PARAM_SESS_RECOVERY_TMO: |
a54a52ca | 1068 | sscanf(data, "%d", &value); |
30a6c652 MC |
1069 | if (value != 0) |
1070 | session->recovery_tmo = value; | |
1071 | break; | |
fd7255f5 | 1072 | default: |
a54a52ca MC |
1073 | err = transport->set_param(conn, ev->u.set_param.param, |
1074 | data, ev->u.set_param.len); | |
fd7255f5 MC |
1075 | } |
1076 | ||
1077 | return err; | |
1078 | } | |
1079 | ||
264faaaa OG |
1080 | static int |
1081 | iscsi_if_transport_ep(struct iscsi_transport *transport, | |
1082 | struct iscsi_uevent *ev, int msg_type) | |
1083 | { | |
1084 | struct sockaddr *dst_addr; | |
1085 | int rc = 0; | |
1086 | ||
1087 | switch (msg_type) { | |
1088 | case ISCSI_UEVENT_TRANSPORT_EP_CONNECT: | |
1089 | if (!transport->ep_connect) | |
1090 | return -EINVAL; | |
1091 | ||
1092 | dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev)); | |
1093 | rc = transport->ep_connect(dst_addr, | |
1094 | ev->u.ep_connect.non_blocking, | |
1095 | &ev->r.ep_connect_ret.handle); | |
1096 | break; | |
1097 | case ISCSI_UEVENT_TRANSPORT_EP_POLL: | |
1098 | if (!transport->ep_poll) | |
1099 | return -EINVAL; | |
1100 | ||
1101 | ev->r.retcode = transport->ep_poll(ev->u.ep_poll.ep_handle, | |
1102 | ev->u.ep_poll.timeout_ms); | |
1103 | break; | |
1104 | case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT: | |
1105 | if (!transport->ep_disconnect) | |
1106 | return -EINVAL; | |
1107 | ||
1108 | transport->ep_disconnect(ev->u.ep_disconnect.ep_handle); | |
1109 | break; | |
1110 | } | |
1111 | return rc; | |
1112 | } | |
1113 | ||
01cb225d MC |
1114 | static int |
1115 | iscsi_tgt_dscvr(struct iscsi_transport *transport, | |
1116 | struct iscsi_uevent *ev) | |
1117 | { | |
1118 | struct sockaddr *dst_addr; | |
1119 | ||
1120 | if (!transport->tgt_dscvr) | |
1121 | return -EINVAL; | |
1122 | ||
1123 | dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev)); | |
1124 | return transport->tgt_dscvr(ev->u.tgt_dscvr.type, | |
1125 | ev->u.tgt_dscvr.host_no, | |
1126 | ev->u.tgt_dscvr.enable, dst_addr); | |
1127 | } | |
1128 | ||
0896b752 AA |
1129 | static int |
1130 | iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) | |
1131 | { | |
1132 | int err = 0; | |
1133 | struct iscsi_uevent *ev = NLMSG_DATA(nlh); | |
1134 | struct iscsi_transport *transport = NULL; | |
1135 | struct iscsi_internal *priv; | |
7b7232f3 MC |
1136 | struct iscsi_cls_session *session; |
1137 | struct iscsi_cls_conn *conn; | |
7996a778 | 1138 | unsigned long flags; |
0896b752 | 1139 | |
0896b752 AA |
1140 | priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle)); |
1141 | if (!priv) | |
1142 | return -EINVAL; | |
1143 | transport = priv->iscsi_transport; | |
1144 | ||
7b7232f3 MC |
1145 | if (!try_module_get(transport->owner)) |
1146 | return -EINVAL; | |
1147 | ||
790f39a2 MC |
1148 | priv->daemon_pid = NETLINK_CREDS(skb)->pid; |
1149 | ||
0896b752 AA |
1150 | switch (nlh->nlmsg_type) { |
1151 | case ISCSI_UEVENT_CREATE_SESSION: | |
1152 | err = iscsi_if_create_session(priv, ev); | |
1153 | break; | |
1154 | case ISCSI_UEVENT_DESTROY_SESSION: | |
b5c7a12d | 1155 | session = iscsi_session_lookup(ev->u.d_session.sid); |
7996a778 MC |
1156 | if (session) { |
1157 | spin_lock_irqsave(&sesslock, flags); | |
1158 | list_del(&session->sess_list); | |
1159 | spin_unlock_irqrestore(&sesslock, flags); | |
1160 | ||
7b7232f3 | 1161 | transport->destroy_session(session); |
7996a778 | 1162 | } else |
7b7232f3 | 1163 | err = -EINVAL; |
0896b752 AA |
1164 | break; |
1165 | case ISCSI_UEVENT_CREATE_CONN: | |
1166 | err = iscsi_if_create_conn(transport, ev); | |
1167 | break; | |
1168 | case ISCSI_UEVENT_DESTROY_CONN: | |
1169 | err = iscsi_if_destroy_conn(transport, ev); | |
1170 | break; | |
1171 | case ISCSI_UEVENT_BIND_CONN: | |
b5c7a12d MC |
1172 | session = iscsi_session_lookup(ev->u.b_conn.sid); |
1173 | conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid); | |
7b7232f3 MC |
1174 | |
1175 | if (session && conn) | |
1176 | ev->r.retcode = transport->bind_conn(session, conn, | |
264faaaa | 1177 | ev->u.b_conn.transport_eph, |
7b7232f3 MC |
1178 | ev->u.b_conn.is_leading); |
1179 | else | |
1180 | err = -EINVAL; | |
0896b752 AA |
1181 | break; |
1182 | case ISCSI_UEVENT_SET_PARAM: | |
fd7255f5 | 1183 | err = iscsi_set_param(transport, ev); |
0896b752 AA |
1184 | break; |
1185 | case ISCSI_UEVENT_START_CONN: | |
b5c7a12d | 1186 | conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid); |
7b7232f3 MC |
1187 | if (conn) |
1188 | ev->r.retcode = transport->start_conn(conn); | |
1189 | else | |
1190 | err = -EINVAL; | |
0896b752 AA |
1191 | break; |
1192 | case ISCSI_UEVENT_STOP_CONN: | |
b5c7a12d | 1193 | conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid); |
7b7232f3 MC |
1194 | if (conn) |
1195 | transport->stop_conn(conn, ev->u.stop_conn.flag); | |
1196 | else | |
1197 | err = -EINVAL; | |
0896b752 AA |
1198 | break; |
1199 | case ISCSI_UEVENT_SEND_PDU: | |
b5c7a12d | 1200 | conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid); |
7b7232f3 MC |
1201 | if (conn) |
1202 | ev->r.retcode = transport->send_pdu(conn, | |
1203 | (struct iscsi_hdr*)((char*)ev + sizeof(*ev)), | |
1204 | (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size, | |
1205 | ev->u.send_pdu.data_size); | |
1206 | else | |
1207 | err = -EINVAL; | |
0896b752 AA |
1208 | break; |
1209 | case ISCSI_UEVENT_GET_STATS: | |
5b940adf | 1210 | err = iscsi_if_get_stats(transport, nlh); |
0896b752 | 1211 | break; |
264faaaa OG |
1212 | case ISCSI_UEVENT_TRANSPORT_EP_CONNECT: |
1213 | case ISCSI_UEVENT_TRANSPORT_EP_POLL: | |
1214 | case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT: | |
1215 | err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type); | |
1216 | break; | |
01cb225d MC |
1217 | case ISCSI_UEVENT_TGT_DSCVR: |
1218 | err = iscsi_tgt_dscvr(transport, ev); | |
1219 | break; | |
0896b752 AA |
1220 | default: |
1221 | err = -EINVAL; | |
1222 | break; | |
1223 | } | |
1224 | ||
7b7232f3 | 1225 | module_put(transport->owner); |
0896b752 AA |
1226 | return err; |
1227 | } | |
1228 | ||
b5c7a12d MC |
1229 | /* |
1230 | * Get message from skb (based on rtnetlink_rcv_skb). Each message is | |
1231 | * processed by iscsi_if_recv_msg. Malformed skbs with wrong lengths or | |
1232 | * invalid creds are discarded silently. | |
1233 | */ | |
0896b752 AA |
1234 | static void |
1235 | iscsi_if_rx(struct sock *sk, int len) | |
1236 | { | |
1237 | struct sk_buff *skb; | |
1da177e4 | 1238 | |
0b950672 | 1239 | mutex_lock(&rx_queue_mutex); |
0896b752 | 1240 | while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { |
ee7f8e40 MC |
1241 | if (NETLINK_CREDS(skb)->uid) { |
1242 | skb_pull(skb, skb->len); | |
1243 | goto free_skb; | |
1244 | } | |
ee7f8e40 | 1245 | |
0896b752 AA |
1246 | while (skb->len >= NLMSG_SPACE(0)) { |
1247 | int err; | |
1248 | uint32_t rlen; | |
1249 | struct nlmsghdr *nlh; | |
1250 | struct iscsi_uevent *ev; | |
1251 | ||
1252 | nlh = (struct nlmsghdr *)skb->data; | |
1253 | if (nlh->nlmsg_len < sizeof(*nlh) || | |
1254 | skb->len < nlh->nlmsg_len) { | |
1255 | break; | |
1256 | } | |
ee7f8e40 | 1257 | |
0896b752 AA |
1258 | ev = NLMSG_DATA(nlh); |
1259 | rlen = NLMSG_ALIGN(nlh->nlmsg_len); | |
1260 | if (rlen > skb->len) | |
1261 | rlen = skb->len; | |
ee7f8e40 | 1262 | |
0896b752 AA |
1263 | err = iscsi_if_recv_msg(skb, nlh); |
1264 | if (err) { | |
1265 | ev->type = ISCSI_KEVENT_IF_ERROR; | |
1266 | ev->iferror = err; | |
1267 | } | |
1268 | do { | |
1269 | /* | |
1270 | * special case for GET_STATS: | |
1271 | * on success - sending reply and stats from | |
1272 | * inside of if_recv_msg(), | |
1273 | * on error - fall through. | |
1274 | */ | |
1275 | if (ev->type == ISCSI_UEVENT_GET_STATS && !err) | |
1276 | break; | |
1277 | err = iscsi_if_send_reply( | |
1278 | NETLINK_CREDS(skb)->pid, nlh->nlmsg_seq, | |
1279 | nlh->nlmsg_type, 0, 0, ev, sizeof(*ev)); | |
7b8631b5 MC |
1280 | if (atomic_read(&z_reply->allocated) >= |
1281 | z_reply->hiwat) | |
0896b752 AA |
1282 | ev->iferror = -ENOMEM; |
1283 | } while (err < 0 && err != -ECONNREFUSED); | |
1284 | skb_pull(skb, rlen); | |
1285 | } | |
ee7f8e40 | 1286 | free_skb: |
0896b752 AA |
1287 | kfree_skb(skb); |
1288 | } | |
0b950672 | 1289 | mutex_unlock(&rx_queue_mutex); |
0896b752 | 1290 | } |
1da177e4 | 1291 | |
7b8631b5 MC |
1292 | #define iscsi_cdev_to_conn(_cdev) \ |
1293 | iscsi_dev_to_conn(_cdev->dev) | |
1294 | ||
fd7255f5 MC |
1295 | #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \ |
1296 | struct class_device_attribute class_device_attr_##_prefix##_##_name = \ | |
1297 | __ATTR(_name,_mode,_show,_store) | |
1298 | ||
1da177e4 | 1299 | /* |
0896b752 | 1300 | * iSCSI connection attrs |
1da177e4 | 1301 | */ |
a54a52ca | 1302 | #define iscsi_conn_attr_show(param) \ |
0896b752 | 1303 | static ssize_t \ |
a54a52ca | 1304 | show_conn_param_##param(struct class_device *cdev, char *buf) \ |
0896b752 | 1305 | { \ |
7b8631b5 MC |
1306 | struct iscsi_cls_conn *conn = iscsi_cdev_to_conn(cdev); \ |
1307 | struct iscsi_transport *t = conn->transport; \ | |
a54a52ca | 1308 | return t->get_conn_param(conn, param, buf); \ |
0896b752 AA |
1309 | } |
1310 | ||
a54a52ca MC |
1311 | #define iscsi_conn_attr(field, param) \ |
1312 | iscsi_conn_attr_show(param) \ | |
1313 | static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param, \ | |
fd7255f5 | 1314 | NULL); |
0896b752 | 1315 | |
a54a52ca MC |
1316 | iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH); |
1317 | iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH); | |
1318 | iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN); | |
1319 | iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN); | |
1320 | iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN); | |
1321 | iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN); | |
1322 | iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT); | |
1323 | iscsi_conn_attr(port, ISCSI_PARAM_CONN_PORT); | |
1324 | iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN); | |
1325 | iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS); | |
1326 | iscsi_conn_attr(address, ISCSI_PARAM_CONN_ADDRESS); | |
1da177e4 | 1327 | |
7b8631b5 MC |
1328 | #define iscsi_cdev_to_session(_cdev) \ |
1329 | iscsi_dev_to_session(_cdev->dev) | |
1330 | ||
1da177e4 | 1331 | /* |
0896b752 | 1332 | * iSCSI session attrs |
1da177e4 | 1333 | */ |
a54a52ca | 1334 | #define iscsi_session_attr_show(param) \ |
fd7255f5 | 1335 | static ssize_t \ |
a54a52ca | 1336 | show_session_param_##param(struct class_device *cdev, char *buf) \ |
fd7255f5 MC |
1337 | { \ |
1338 | struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev); \ | |
1339 | struct iscsi_transport *t = session->transport; \ | |
a54a52ca | 1340 | return t->get_session_param(session, param, buf); \ |
fd7255f5 MC |
1341 | } |
1342 | ||
a54a52ca MC |
1343 | #define iscsi_session_attr(field, param) \ |
1344 | iscsi_session_attr_show(param) \ | |
1345 | static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \ | |
fd7255f5 MC |
1346 | NULL); |
1347 | ||
a54a52ca MC |
1348 | iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME); |
1349 | iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN); | |
1350 | iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T); | |
1351 | iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN); | |
1352 | iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST); | |
1353 | iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST); | |
1354 | iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN); | |
1355 | iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN); | |
1356 | iscsi_session_attr(erl, ISCSI_PARAM_ERL); | |
1357 | iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT); | |
1da177e4 | 1358 | |
fd7255f5 MC |
1359 | #define iscsi_priv_session_attr_show(field, format) \ |
1360 | static ssize_t \ | |
a54a52ca | 1361 | show_priv_session_##field(struct class_device *cdev, char *buf) \ |
fd7255f5 | 1362 | { \ |
a54a52ca | 1363 | struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev);\ |
fd7255f5 MC |
1364 | return sprintf(buf, format"\n", session->field); \ |
1365 | } | |
1366 | ||
1367 | #define iscsi_priv_session_attr(field, format) \ | |
1368 | iscsi_priv_session_attr_show(field, format) \ | |
1369 | static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO, show_priv_session_##field, \ | |
1370 | NULL) | |
30a6c652 | 1371 | iscsi_priv_session_attr(recovery_tmo, "%d"); |
fd7255f5 | 1372 | |
fd7255f5 MC |
1373 | #define SETUP_PRIV_SESSION_RD_ATTR(field) \ |
1374 | do { \ | |
1375 | priv->session_attrs[count] = &class_device_attr_priv_sess_##field; \ | |
1376 | count++; \ | |
1377 | } while (0) | |
1378 | ||
a54a52ca | 1379 | |
fd7255f5 MC |
1380 | #define SETUP_SESSION_RD_ATTR(field, param_flag) \ |
1381 | do { \ | |
1382 | if (tt->param_mask & param_flag) { \ | |
1383 | priv->session_attrs[count] = &class_device_attr_sess_##field; \ | |
1da177e4 | 1384 | count++; \ |
fd7255f5 MC |
1385 | } \ |
1386 | } while (0) | |
1387 | ||
fd7255f5 MC |
1388 | #define SETUP_CONN_RD_ATTR(field, param_flag) \ |
1389 | do { \ | |
1390 | if (tt->param_mask & param_flag) { \ | |
1391 | priv->conn_attrs[count] = &class_device_attr_conn_##field; \ | |
1392 | count++; \ | |
1393 | } \ | |
1394 | } while (0) | |
1da177e4 | 1395 | |
0896b752 AA |
1396 | static int iscsi_session_match(struct attribute_container *cont, |
1397 | struct device *dev) | |
1da177e4 | 1398 | { |
7b8631b5 | 1399 | struct iscsi_cls_session *session; |
1da177e4 | 1400 | struct Scsi_Host *shost; |
0896b752 AA |
1401 | struct iscsi_internal *priv; |
1402 | ||
1403 | if (!iscsi_is_session_dev(dev)) | |
1404 | return 0; | |
1da177e4 | 1405 | |
7b8631b5 MC |
1406 | session = iscsi_dev_to_session(dev); |
1407 | shost = iscsi_session_to_shost(session); | |
0896b752 | 1408 | if (!shost->transportt) |
1da177e4 LT |
1409 | return 0; |
1410 | ||
0896b752 AA |
1411 | priv = to_iscsi_internal(shost->transportt); |
1412 | if (priv->session_cont.ac.class != &iscsi_session_class.class) | |
1da177e4 LT |
1413 | return 0; |
1414 | ||
0896b752 | 1415 | return &priv->session_cont.ac == cont; |
1da177e4 LT |
1416 | } |
1417 | ||
0896b752 AA |
1418 | static int iscsi_conn_match(struct attribute_container *cont, |
1419 | struct device *dev) | |
1420 | { | |
7b8631b5 MC |
1421 | struct iscsi_cls_session *session; |
1422 | struct iscsi_cls_conn *conn; | |
1da177e4 | 1423 | struct Scsi_Host *shost; |
0896b752 | 1424 | struct iscsi_internal *priv; |
1da177e4 | 1425 | |
0896b752 | 1426 | if (!iscsi_is_conn_dev(dev)) |
1da177e4 LT |
1427 | return 0; |
1428 | ||
7b8631b5 MC |
1429 | conn = iscsi_dev_to_conn(dev); |
1430 | session = iscsi_dev_to_session(conn->dev.parent); | |
1431 | shost = iscsi_session_to_shost(session); | |
1432 | ||
0896b752 | 1433 | if (!shost->transportt) |
1da177e4 LT |
1434 | return 0; |
1435 | ||
0896b752 AA |
1436 | priv = to_iscsi_internal(shost->transportt); |
1437 | if (priv->conn_cont.ac.class != &iscsi_connection_class.class) | |
1438 | return 0; | |
1da177e4 | 1439 | |
0896b752 AA |
1440 | return &priv->conn_cont.ac == cont; |
1441 | } | |
1442 | ||
30a6c652 MC |
1443 | static int iscsi_host_match(struct attribute_container *cont, |
1444 | struct device *dev) | |
1445 | { | |
1446 | struct Scsi_Host *shost; | |
1447 | struct iscsi_internal *priv; | |
1448 | ||
1449 | if (!scsi_is_host_device(dev)) | |
1450 | return 0; | |
1451 | ||
1452 | shost = dev_to_shost(dev); | |
1453 | if (!shost->transportt || | |
1454 | shost->transportt->host_attrs.ac.class != &iscsi_host_class.class) | |
1455 | return 0; | |
1456 | ||
1457 | priv = to_iscsi_internal(shost->transportt); | |
1458 | return &priv->t.host_attrs.ac == cont; | |
1459 | } | |
1460 | ||
7b8631b5 MC |
1461 | struct scsi_transport_template * |
1462 | iscsi_register_transport(struct iscsi_transport *tt) | |
0896b752 AA |
1463 | { |
1464 | struct iscsi_internal *priv; | |
1465 | unsigned long flags; | |
1466 | int count = 0, err; | |
1467 | ||
1468 | BUG_ON(!tt); | |
1469 | ||
1470 | priv = iscsi_if_transport_lookup(tt); | |
1471 | if (priv) | |
7b8631b5 | 1472 | return NULL; |
0896b752 | 1473 | |
24669f75 | 1474 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
0896b752 | 1475 | if (!priv) |
7b8631b5 | 1476 | return NULL; |
0896b752 | 1477 | INIT_LIST_HEAD(&priv->list); |
53cb8a1f | 1478 | priv->daemon_pid = -1; |
0896b752 | 1479 | priv->iscsi_transport = tt; |
30a6c652 | 1480 | priv->t.user_scan = iscsi_user_scan; |
0896b752 AA |
1481 | |
1482 | priv->cdev.class = &iscsi_transport_class; | |
1483 | snprintf(priv->cdev.class_id, BUS_ID_SIZE, "%s", tt->name); | |
1484 | err = class_device_register(&priv->cdev); | |
1485 | if (err) | |
1486 | goto free_priv; | |
1487 | ||
1488 | err = sysfs_create_group(&priv->cdev.kobj, &iscsi_transport_group); | |
1489 | if (err) | |
1490 | goto unregister_cdev; | |
1491 | ||
30a6c652 MC |
1492 | /* host parameters */ |
1493 | priv->t.host_attrs.ac.attrs = &priv->host_attrs[0]; | |
1494 | priv->t.host_attrs.ac.class = &iscsi_host_class.class; | |
1495 | priv->t.host_attrs.ac.match = iscsi_host_match; | |
1496 | priv->t.host_size = sizeof(struct iscsi_host); | |
1497 | priv->host_attrs[0] = NULL; | |
1498 | transport_container_register(&priv->t.host_attrs); | |
1499 | ||
0896b752 AA |
1500 | /* connection parameters */ |
1501 | priv->conn_cont.ac.attrs = &priv->conn_attrs[0]; | |
1502 | priv->conn_cont.ac.class = &iscsi_connection_class.class; | |
1503 | priv->conn_cont.ac.match = iscsi_conn_match; | |
1504 | transport_container_register(&priv->conn_cont); | |
1da177e4 | 1505 | |
fd7255f5 MC |
1506 | SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_MAX_RECV_DLENGTH); |
1507 | SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_MAX_XMIT_DLENGTH); | |
1508 | SETUP_CONN_RD_ATTR(header_digest, ISCSI_HDRDGST_EN); | |
1509 | SETUP_CONN_RD_ATTR(data_digest, ISCSI_DATADGST_EN); | |
1510 | SETUP_CONN_RD_ATTR(ifmarker, ISCSI_IFMARKER_EN); | |
1511 | SETUP_CONN_RD_ATTR(ofmarker, ISCSI_OFMARKER_EN); | |
1512 | SETUP_CONN_RD_ATTR(address, ISCSI_CONN_ADDRESS); | |
1513 | SETUP_CONN_RD_ATTR(port, ISCSI_CONN_PORT); | |
8d2860b3 | 1514 | SETUP_CONN_RD_ATTR(exp_statsn, ISCSI_EXP_STATSN); |
a54a52ca MC |
1515 | SETUP_CONN_RD_ATTR(persistent_address, ISCSI_PERSISTENT_ADDRESS); |
1516 | SETUP_CONN_RD_ATTR(persistent_port, ISCSI_PERSISTENT_PORT); | |
0896b752 AA |
1517 | |
1518 | BUG_ON(count > ISCSI_CONN_ATTRS); | |
1519 | priv->conn_attrs[count] = NULL; | |
1da177e4 | 1520 | count = 0; |
1da177e4 | 1521 | |
0896b752 AA |
1522 | /* session parameters */ |
1523 | priv->session_cont.ac.attrs = &priv->session_attrs[0]; | |
1524 | priv->session_cont.ac.class = &iscsi_session_class.class; | |
1525 | priv->session_cont.ac.match = iscsi_session_match; | |
1526 | transport_container_register(&priv->session_cont); | |
1527 | ||
fd7255f5 MC |
1528 | SETUP_SESSION_RD_ATTR(initial_r2t, ISCSI_INITIAL_R2T_EN); |
1529 | SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_MAX_R2T); | |
1530 | SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_IMM_DATA_EN); | |
1531 | SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_FIRST_BURST); | |
1532 | SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_MAX_BURST); | |
1533 | SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PDU_INORDER_EN); | |
1534 | SETUP_SESSION_RD_ATTR(data_seq_in_order, ISCSI_DATASEQ_INORDER_EN); | |
1535 | SETUP_SESSION_RD_ATTR(erl, ISCSI_ERL); | |
a54a52ca MC |
1536 | SETUP_SESSION_RD_ATTR(targetname, ISCSI_TARGET_NAME); |
1537 | SETUP_SESSION_RD_ATTR(tpgt, ISCSI_TPGT); | |
30a6c652 | 1538 | SETUP_PRIV_SESSION_RD_ATTR(recovery_tmo); |
fd7255f5 | 1539 | |
0896b752 AA |
1540 | BUG_ON(count > ISCSI_SESSION_ATTRS); |
1541 | priv->session_attrs[count] = NULL; | |
1542 | ||
1543 | spin_lock_irqsave(&iscsi_transport_lock, flags); | |
1544 | list_add(&priv->list, &iscsi_transports); | |
1545 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
1546 | ||
1547 | printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name); | |
7b8631b5 | 1548 | return &priv->t; |
1da177e4 | 1549 | |
0896b752 AA |
1550 | unregister_cdev: |
1551 | class_device_unregister(&priv->cdev); | |
1552 | free_priv: | |
1553 | kfree(priv); | |
7b8631b5 | 1554 | return NULL; |
1da177e4 | 1555 | } |
0896b752 AA |
1556 | EXPORT_SYMBOL_GPL(iscsi_register_transport); |
1557 | ||
1558 | int iscsi_unregister_transport(struct iscsi_transport *tt) | |
1559 | { | |
1560 | struct iscsi_internal *priv; | |
1561 | unsigned long flags; | |
1562 | ||
1563 | BUG_ON(!tt); | |
1564 | ||
0b950672 | 1565 | mutex_lock(&rx_queue_mutex); |
0896b752 AA |
1566 | |
1567 | priv = iscsi_if_transport_lookup(tt); | |
1568 | BUG_ON (!priv); | |
1569 | ||
0896b752 AA |
1570 | spin_lock_irqsave(&iscsi_transport_lock, flags); |
1571 | list_del(&priv->list); | |
1572 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
1573 | ||
1574 | transport_container_unregister(&priv->conn_cont); | |
1575 | transport_container_unregister(&priv->session_cont); | |
30a6c652 | 1576 | transport_container_unregister(&priv->t.host_attrs); |
0896b752 AA |
1577 | |
1578 | sysfs_remove_group(&priv->cdev.kobj, &iscsi_transport_group); | |
1579 | class_device_unregister(&priv->cdev); | |
0b950672 | 1580 | mutex_unlock(&rx_queue_mutex); |
1da177e4 | 1581 | |
0896b752 AA |
1582 | return 0; |
1583 | } | |
1584 | EXPORT_SYMBOL_GPL(iscsi_unregister_transport); | |
1da177e4 | 1585 | |
0896b752 AA |
1586 | static int |
1587 | iscsi_rcv_nl_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1da177e4 | 1588 | { |
0896b752 AA |
1589 | struct netlink_notify *n = ptr; |
1590 | ||
1591 | if (event == NETLINK_URELEASE && | |
1592 | n->protocol == NETLINK_ISCSI && n->pid) { | |
7b8631b5 | 1593 | struct iscsi_cls_conn *conn; |
0896b752 AA |
1594 | unsigned long flags; |
1595 | ||
7b8631b5 | 1596 | mempool_zone_complete(z_reply); |
0896b752 AA |
1597 | spin_lock_irqsave(&connlock, flags); |
1598 | list_for_each_entry(conn, &connlist, conn_list) { | |
7b8631b5 MC |
1599 | mempool_zone_complete(conn->z_error); |
1600 | mempool_zone_complete(conn->z_pdu); | |
0896b752 AA |
1601 | } |
1602 | spin_unlock_irqrestore(&connlock, flags); | |
1603 | } | |
1da177e4 | 1604 | |
0896b752 | 1605 | return NOTIFY_DONE; |
1da177e4 LT |
1606 | } |
1607 | ||
0896b752 AA |
1608 | static struct notifier_block iscsi_nl_notifier = { |
1609 | .notifier_call = iscsi_rcv_nl_event, | |
1610 | }; | |
1da177e4 LT |
1611 | |
1612 | static __init int iscsi_transport_init(void) | |
1613 | { | |
0896b752 | 1614 | int err; |
1da177e4 | 1615 | |
0896b752 | 1616 | err = class_register(&iscsi_transport_class); |
1da177e4 LT |
1617 | if (err) |
1618 | return err; | |
0896b752 | 1619 | |
30a6c652 | 1620 | err = transport_class_register(&iscsi_host_class); |
0896b752 AA |
1621 | if (err) |
1622 | goto unregister_transport_class; | |
1623 | ||
30a6c652 MC |
1624 | err = transport_class_register(&iscsi_connection_class); |
1625 | if (err) | |
1626 | goto unregister_host_class; | |
1627 | ||
0896b752 AA |
1628 | err = transport_class_register(&iscsi_session_class); |
1629 | if (err) | |
1630 | goto unregister_conn_class; | |
1631 | ||
1632 | err = netlink_register_notifier(&iscsi_nl_notifier); | |
1633 | if (err) | |
1634 | goto unregister_session_class; | |
1635 | ||
2290d2b6 | 1636 | nls = netlink_kernel_create(NETLINK_ISCSI, 1, iscsi_if_rx, |
7b8631b5 | 1637 | THIS_MODULE); |
0896b752 AA |
1638 | if (!nls) { |
1639 | err = -ENOBUFS; | |
1640 | goto unregister_notifier; | |
1641 | } | |
1642 | ||
7b8631b5 | 1643 | z_reply = mempool_zone_init(Z_MAX_REPLY, |
0896b752 | 1644 | NLMSG_SPACE(sizeof(struct iscsi_uevent)), Z_HIWAT_REPLY); |
7b8631b5 | 1645 | if (z_reply) |
0896b752 AA |
1646 | return 0; |
1647 | ||
1648 | sock_release(nls->sk_socket); | |
1649 | unregister_notifier: | |
1650 | netlink_unregister_notifier(&iscsi_nl_notifier); | |
1651 | unregister_session_class: | |
1652 | transport_class_unregister(&iscsi_session_class); | |
1653 | unregister_conn_class: | |
1654 | transport_class_unregister(&iscsi_connection_class); | |
30a6c652 MC |
1655 | unregister_host_class: |
1656 | transport_class_unregister(&iscsi_host_class); | |
0896b752 AA |
1657 | unregister_transport_class: |
1658 | class_unregister(&iscsi_transport_class); | |
1659 | return err; | |
1da177e4 LT |
1660 | } |
1661 | ||
1662 | static void __exit iscsi_transport_exit(void) | |
1663 | { | |
7b8631b5 | 1664 | mempool_zone_destroy(z_reply); |
0896b752 AA |
1665 | sock_release(nls->sk_socket); |
1666 | netlink_unregister_notifier(&iscsi_nl_notifier); | |
1667 | transport_class_unregister(&iscsi_connection_class); | |
1668 | transport_class_unregister(&iscsi_session_class); | |
30a6c652 | 1669 | transport_class_unregister(&iscsi_host_class); |
0896b752 | 1670 | class_unregister(&iscsi_transport_class); |
1da177e4 LT |
1671 | } |
1672 | ||
1673 | module_init(iscsi_transport_init); | |
1674 | module_exit(iscsi_transport_exit); | |
1675 | ||
0896b752 AA |
1676 | MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, " |
1677 | "Dmitry Yusupov <dmitry_yus@yahoo.com>, " | |
1678 | "Alex Aizman <itn780@yahoo.com>"); | |
1679 | MODULE_DESCRIPTION("iSCSI Transport Interface"); | |
1da177e4 | 1680 | MODULE_LICENSE("GPL"); |