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 |
fd7255f5 | 35 | #define ISCSI_CONN_ATTRS 10 |
30a6c652 | 36 | #define ISCSI_HOST_ATTRS 0 |
1da177e4 LT |
37 | |
38 | struct iscsi_internal { | |
39 | struct scsi_transport_template t; | |
0896b752 AA |
40 | struct iscsi_transport *iscsi_transport; |
41 | struct list_head list; | |
0896b752 | 42 | struct class_device cdev; |
30a6c652 MC |
43 | |
44 | struct class_device_attribute *host_attrs[ISCSI_HOST_ATTRS + 1]; | |
0896b752 AA |
45 | struct transport_container conn_cont; |
46 | struct class_device_attribute *conn_attrs[ISCSI_CONN_ATTRS + 1]; | |
47 | struct transport_container session_cont; | |
1da177e4 | 48 | struct class_device_attribute *session_attrs[ISCSI_SESSION_ATTRS + 1]; |
1da177e4 LT |
49 | }; |
50 | ||
b5c7a12d MC |
51 | static int iscsi_session_nr; /* sysfs session id for next new session */ |
52 | ||
0896b752 AA |
53 | /* |
54 | * list of registered transports and lock that must | |
55 | * be held while accessing list. The iscsi_transport_lock must | |
0b950672 | 56 | * be acquired after the rx_queue_mutex. |
0896b752 AA |
57 | */ |
58 | static LIST_HEAD(iscsi_transports); | |
59 | static DEFINE_SPINLOCK(iscsi_transport_lock); | |
60 | ||
61 | #define to_iscsi_internal(tmpl) \ | |
62 | container_of(tmpl, struct iscsi_internal, t) | |
63 | ||
64 | #define cdev_to_iscsi_internal(_cdev) \ | |
65 | container_of(_cdev, struct iscsi_internal, cdev) | |
66 | ||
67 | static void iscsi_transport_release(struct class_device *cdev) | |
68 | { | |
69 | struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev); | |
70 | kfree(priv); | |
71 | } | |
1da177e4 | 72 | |
0896b752 AA |
73 | /* |
74 | * iscsi_transport_class represents the iscsi_transports that are | |
75 | * registered. | |
76 | */ | |
77 | static struct class iscsi_transport_class = { | |
78 | .name = "iscsi_transport", | |
79 | .release = iscsi_transport_release, | |
80 | }; | |
81 | ||
82 | static ssize_t | |
83 | show_transport_handle(struct class_device *cdev, char *buf) | |
84 | { | |
85 | struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev); | |
762e2bfa | 86 | return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport)); |
0896b752 AA |
87 | } |
88 | static CLASS_DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL); | |
89 | ||
90 | #define show_transport_attr(name, format) \ | |
91 | static ssize_t \ | |
92 | show_transport_##name(struct class_device *cdev, char *buf) \ | |
93 | { \ | |
94 | struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev); \ | |
95 | return sprintf(buf, format"\n", priv->iscsi_transport->name); \ | |
96 | } \ | |
97 | static CLASS_DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL); | |
98 | ||
99 | show_transport_attr(caps, "0x%x"); | |
100 | show_transport_attr(max_lun, "%d"); | |
101 | show_transport_attr(max_conn, "%d"); | |
102 | show_transport_attr(max_cmd_len, "%d"); | |
103 | ||
104 | static struct attribute *iscsi_transport_attrs[] = { | |
105 | &class_device_attr_handle.attr, | |
106 | &class_device_attr_caps.attr, | |
107 | &class_device_attr_max_lun.attr, | |
108 | &class_device_attr_max_conn.attr, | |
109 | &class_device_attr_max_cmd_len.attr, | |
110 | NULL, | |
111 | }; | |
112 | ||
113 | static struct attribute_group iscsi_transport_group = { | |
114 | .attrs = iscsi_transport_attrs, | |
115 | }; | |
116 | ||
30a6c652 MC |
117 | static int iscsi_setup_host(struct transport_container *tc, struct device *dev, |
118 | struct class_device *cdev) | |
119 | { | |
120 | struct Scsi_Host *shost = dev_to_shost(dev); | |
121 | struct iscsi_host *ihost = shost->shost_data; | |
122 | ||
123 | memset(ihost, 0, sizeof(*ihost)); | |
124 | INIT_LIST_HEAD(&ihost->sessions); | |
125 | mutex_init(&ihost->mutex); | |
126 | return 0; | |
127 | } | |
128 | ||
129 | static DECLARE_TRANSPORT_CLASS(iscsi_host_class, | |
130 | "iscsi_host", | |
131 | iscsi_setup_host, | |
132 | NULL, | |
133 | NULL); | |
134 | ||
0896b752 AA |
135 | static DECLARE_TRANSPORT_CLASS(iscsi_session_class, |
136 | "iscsi_session", | |
1da177e4 LT |
137 | NULL, |
138 | NULL, | |
139 | NULL); | |
140 | ||
0896b752 AA |
141 | static DECLARE_TRANSPORT_CLASS(iscsi_connection_class, |
142 | "iscsi_connection", | |
1da177e4 LT |
143 | NULL, |
144 | NULL, | |
145 | NULL); | |
0896b752 AA |
146 | |
147 | static struct sock *nls; | |
148 | static int daemon_pid; | |
0b950672 | 149 | static DEFINE_MUTEX(rx_queue_mutex); |
0896b752 AA |
150 | |
151 | struct mempool_zone { | |
152 | mempool_t *pool; | |
153 | atomic_t allocated; | |
154 | int size; | |
155 | int hiwat; | |
156 | struct list_head freequeue; | |
157 | spinlock_t freelock; | |
158 | }; | |
159 | ||
7b8631b5 | 160 | static struct mempool_zone *z_reply; |
0896b752 | 161 | |
1da177e4 | 162 | /* |
0896b752 AA |
163 | * Z_MAX_* - actual mempool size allocated at the mempool_zone_init() time |
164 | * Z_HIWAT_* - zone's high watermark when if_error bit will be set to -ENOMEM | |
165 | * so daemon will notice OOM on NETLINK tranposrt level and will | |
166 | * be able to predict or change operational behavior | |
1da177e4 | 167 | */ |
0896b752 AA |
168 | #define Z_MAX_REPLY 8 |
169 | #define Z_HIWAT_REPLY 6 | |
170 | #define Z_MAX_PDU 8 | |
171 | #define Z_HIWAT_PDU 6 | |
172 | #define Z_MAX_ERROR 16 | |
173 | #define Z_HIWAT_ERROR 12 | |
174 | ||
7b7232f3 MC |
175 | static LIST_HEAD(sesslist); |
176 | static DEFINE_SPINLOCK(sesslock); | |
7b8631b5 MC |
177 | static LIST_HEAD(connlist); |
178 | static DEFINE_SPINLOCK(connlock); | |
0896b752 | 179 | |
b5c7a12d MC |
180 | static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn) |
181 | { | |
182 | struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent); | |
183 | return sess->sid; | |
184 | } | |
185 | ||
186 | /* | |
187 | * Returns the matching session to a given sid | |
188 | */ | |
189 | static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid) | |
7b7232f3 MC |
190 | { |
191 | unsigned long flags; | |
192 | struct iscsi_cls_session *sess; | |
193 | ||
194 | spin_lock_irqsave(&sesslock, flags); | |
195 | list_for_each_entry(sess, &sesslist, sess_list) { | |
b5c7a12d | 196 | if (sess->sid == sid) { |
7b7232f3 MC |
197 | spin_unlock_irqrestore(&sesslock, flags); |
198 | return sess; | |
199 | } | |
200 | } | |
201 | spin_unlock_irqrestore(&sesslock, flags); | |
202 | return NULL; | |
203 | } | |
204 | ||
b5c7a12d MC |
205 | /* |
206 | * Returns the matching connection to a given sid / cid tuple | |
207 | */ | |
208 | static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid) | |
7b7232f3 MC |
209 | { |
210 | unsigned long flags; | |
211 | struct iscsi_cls_conn *conn; | |
212 | ||
213 | spin_lock_irqsave(&connlock, flags); | |
214 | list_for_each_entry(conn, &connlist, conn_list) { | |
b5c7a12d | 215 | if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) { |
7b7232f3 MC |
216 | spin_unlock_irqrestore(&connlock, flags); |
217 | return conn; | |
218 | } | |
219 | } | |
220 | spin_unlock_irqrestore(&connlock, flags); | |
221 | return NULL; | |
222 | } | |
223 | ||
7b8631b5 MC |
224 | /* |
225 | * The following functions can be used by LLDs that allocate | |
226 | * their own scsi_hosts or by software iscsi LLDs | |
227 | */ | |
228 | static void iscsi_session_release(struct device *dev) | |
229 | { | |
230 | struct iscsi_cls_session *session = iscsi_dev_to_session(dev); | |
231 | struct iscsi_transport *transport = session->transport; | |
232 | struct Scsi_Host *shost; | |
0896b752 | 233 | |
7b8631b5 MC |
234 | shost = iscsi_session_to_shost(session); |
235 | scsi_host_put(shost); | |
fd7255f5 | 236 | kfree(session->targetname); |
7b8631b5 MC |
237 | kfree(session); |
238 | module_put(transport->owner); | |
239 | } | |
0896b752 | 240 | |
7b8631b5 MC |
241 | static int iscsi_is_session_dev(const struct device *dev) |
242 | { | |
243 | return dev->release == iscsi_session_release; | |
244 | } | |
0896b752 | 245 | |
30a6c652 MC |
246 | static int iscsi_user_scan(struct Scsi_Host *shost, uint channel, |
247 | uint id, uint lun) | |
248 | { | |
249 | struct iscsi_host *ihost = shost->shost_data; | |
250 | struct iscsi_cls_session *session; | |
251 | ||
252 | mutex_lock(&ihost->mutex); | |
253 | list_for_each_entry(session, &ihost->sessions, host_list) { | |
254 | if ((channel == SCAN_WILD_CARD || | |
255 | channel == session->channel) && | |
256 | (id == SCAN_WILD_CARD || id == session->target_id)) | |
257 | scsi_scan_target(&session->dev, session->channel, | |
258 | session->target_id, lun, 1); | |
259 | } | |
260 | mutex_unlock(&ihost->mutex); | |
261 | ||
262 | return 0; | |
263 | } | |
264 | ||
265 | static void session_recovery_timedout(void *data) | |
266 | { | |
267 | struct iscsi_cls_session *session = data; | |
268 | ||
269 | dev_printk(KERN_INFO, &session->dev, "session recovery timed out " | |
270 | "after %d secs\n", session->recovery_tmo); | |
271 | ||
272 | if (session->transport->session_recovery_timedout) | |
273 | session->transport->session_recovery_timedout(session); | |
274 | ||
275 | scsi_target_unblock(&session->dev); | |
276 | } | |
277 | ||
278 | void iscsi_unblock_session(struct iscsi_cls_session *session) | |
279 | { | |
280 | if (!cancel_delayed_work(&session->recovery_work)) | |
281 | flush_scheduled_work(); | |
282 | scsi_target_unblock(&session->dev); | |
283 | } | |
284 | EXPORT_SYMBOL_GPL(iscsi_unblock_session); | |
285 | ||
286 | void iscsi_block_session(struct iscsi_cls_session *session) | |
287 | { | |
288 | scsi_target_block(&session->dev); | |
289 | schedule_delayed_work(&session->recovery_work, | |
290 | session->recovery_tmo * HZ); | |
291 | } | |
292 | EXPORT_SYMBOL_GPL(iscsi_block_session); | |
293 | ||
7b8631b5 MC |
294 | /** |
295 | * iscsi_create_session - create iscsi class session | |
296 | * @shost: scsi host | |
297 | * @transport: iscsi transport | |
298 | * | |
b5c7a12d | 299 | * This can be called from a LLD or iscsi_transport. |
7b8631b5 MC |
300 | **/ |
301 | struct iscsi_cls_session * | |
30a6c652 MC |
302 | iscsi_create_session(struct Scsi_Host *shost, |
303 | struct iscsi_transport *transport, int channel) | |
7b8631b5 | 304 | { |
30a6c652 | 305 | struct iscsi_host *ihost; |
7b8631b5 MC |
306 | struct iscsi_cls_session *session; |
307 | int err; | |
308 | ||
309 | if (!try_module_get(transport->owner)) | |
310 | return NULL; | |
311 | ||
b5c7a12d MC |
312 | session = kzalloc(sizeof(*session) + transport->sessiondata_size, |
313 | GFP_KERNEL); | |
7b8631b5 MC |
314 | if (!session) |
315 | goto module_put; | |
316 | session->transport = transport; | |
30a6c652 MC |
317 | session->recovery_tmo = 120; |
318 | INIT_WORK(&session->recovery_work, session_recovery_timedout, session); | |
319 | INIT_LIST_HEAD(&session->host_list); | |
320 | INIT_LIST_HEAD(&session->sess_list); | |
7b8631b5 | 321 | |
b5c7a12d MC |
322 | if (transport->sessiondata_size) |
323 | session->dd_data = &session[1]; | |
324 | ||
7b8631b5 MC |
325 | /* this is released in the dev's release function */ |
326 | scsi_host_get(shost); | |
30a6c652 MC |
327 | ihost = shost->shost_data; |
328 | ||
b5c7a12d | 329 | session->sid = iscsi_session_nr++; |
30a6c652 MC |
330 | session->channel = channel; |
331 | session->target_id = ihost->next_target_id++; | |
332 | ||
b5c7a12d MC |
333 | snprintf(session->dev.bus_id, BUS_ID_SIZE, "session%u", |
334 | session->sid); | |
7b8631b5 MC |
335 | session->dev.parent = &shost->shost_gendev; |
336 | session->dev.release = iscsi_session_release; | |
337 | err = device_register(&session->dev); | |
338 | if (err) { | |
339 | dev_printk(KERN_ERR, &session->dev, "iscsi: could not " | |
340 | "register session's dev\n"); | |
341 | goto free_session; | |
342 | } | |
343 | transport_register_device(&session->dev); | |
344 | ||
30a6c652 MC |
345 | mutex_lock(&ihost->mutex); |
346 | list_add(&session->host_list, &ihost->sessions); | |
347 | mutex_unlock(&ihost->mutex); | |
348 | ||
7b8631b5 MC |
349 | return session; |
350 | ||
351 | free_session: | |
352 | kfree(session); | |
353 | module_put: | |
354 | module_put(transport->owner); | |
355 | return NULL; | |
356 | } | |
357 | ||
358 | EXPORT_SYMBOL_GPL(iscsi_create_session); | |
359 | ||
360 | /** | |
361 | * iscsi_destroy_session - destroy iscsi session | |
362 | * @session: iscsi_session | |
363 | * | |
364 | * Can be called by a LLD or iscsi_transport. There must not be | |
365 | * any running connections. | |
366 | **/ | |
367 | int iscsi_destroy_session(struct iscsi_cls_session *session) | |
368 | { | |
30a6c652 MC |
369 | struct Scsi_Host *shost = iscsi_session_to_shost(session); |
370 | struct iscsi_host *ihost = shost->shost_data; | |
371 | ||
372 | if (!cancel_delayed_work(&session->recovery_work)) | |
373 | flush_scheduled_work(); | |
374 | ||
375 | mutex_lock(&ihost->mutex); | |
376 | list_del(&session->host_list); | |
377 | mutex_unlock(&ihost->mutex); | |
378 | ||
7b8631b5 MC |
379 | transport_unregister_device(&session->dev); |
380 | device_unregister(&session->dev); | |
381 | return 0; | |
382 | } | |
383 | ||
384 | EXPORT_SYMBOL_GPL(iscsi_destroy_session); | |
385 | ||
386 | static void iscsi_conn_release(struct device *dev) | |
387 | { | |
388 | struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev); | |
389 | struct device *parent = conn->dev.parent; | |
390 | ||
fd7255f5 | 391 | kfree(conn->persistent_address); |
7b8631b5 MC |
392 | kfree(conn); |
393 | put_device(parent); | |
394 | } | |
395 | ||
396 | static int iscsi_is_conn_dev(const struct device *dev) | |
397 | { | |
398 | return dev->release == iscsi_conn_release; | |
399 | } | |
400 | ||
401 | /** | |
402 | * iscsi_create_conn - create iscsi class connection | |
403 | * @session: iscsi cls session | |
404 | * @cid: connection id | |
405 | * | |
406 | * This can be called from a LLD or iscsi_transport. The connection | |
407 | * is child of the session so cid must be unique for all connections | |
408 | * on the session. | |
b5c7a12d MC |
409 | * |
410 | * Since we do not support MCS, cid will normally be zero. In some cases | |
411 | * for software iscsi we could be trying to preallocate a connection struct | |
412 | * in which case there could be two connection structs and cid would be | |
413 | * non-zero. | |
7b8631b5 MC |
414 | **/ |
415 | struct iscsi_cls_conn * | |
416 | iscsi_create_conn(struct iscsi_cls_session *session, uint32_t cid) | |
417 | { | |
418 | struct iscsi_transport *transport = session->transport; | |
7b8631b5 MC |
419 | struct iscsi_cls_conn *conn; |
420 | int err; | |
421 | ||
422 | conn = kzalloc(sizeof(*conn) + transport->conndata_size, GFP_KERNEL); | |
423 | if (!conn) | |
424 | return NULL; | |
425 | ||
426 | if (transport->conndata_size) | |
427 | conn->dd_data = &conn[1]; | |
428 | ||
429 | INIT_LIST_HEAD(&conn->conn_list); | |
430 | conn->transport = transport; | |
b5c7a12d | 431 | conn->cid = cid; |
7b8631b5 MC |
432 | |
433 | /* this is released in the dev's release function */ | |
434 | if (!get_device(&session->dev)) | |
435 | goto free_conn; | |
b5c7a12d | 436 | |
7b8631b5 | 437 | snprintf(conn->dev.bus_id, BUS_ID_SIZE, "connection%d:%u", |
b5c7a12d | 438 | session->sid, cid); |
7b8631b5 MC |
439 | conn->dev.parent = &session->dev; |
440 | conn->dev.release = iscsi_conn_release; | |
441 | err = device_register(&conn->dev); | |
442 | if (err) { | |
443 | dev_printk(KERN_ERR, &conn->dev, "iscsi: could not register " | |
444 | "connection's dev\n"); | |
445 | goto release_parent_ref; | |
446 | } | |
447 | transport_register_device(&conn->dev); | |
448 | return conn; | |
449 | ||
450 | release_parent_ref: | |
451 | put_device(&session->dev); | |
452 | free_conn: | |
453 | kfree(conn); | |
454 | return NULL; | |
455 | } | |
456 | ||
457 | EXPORT_SYMBOL_GPL(iscsi_create_conn); | |
458 | ||
459 | /** | |
460 | * iscsi_destroy_conn - destroy iscsi class connection | |
461 | * @session: iscsi cls session | |
462 | * | |
463 | * This can be called from a LLD or iscsi_transport. | |
464 | **/ | |
465 | int iscsi_destroy_conn(struct iscsi_cls_conn *conn) | |
466 | { | |
467 | transport_unregister_device(&conn->dev); | |
468 | device_unregister(&conn->dev); | |
469 | return 0; | |
470 | } | |
471 | ||
472 | EXPORT_SYMBOL_GPL(iscsi_destroy_conn); | |
473 | ||
474 | /* | |
475 | * These functions are used only by software iscsi_transports | |
476 | * which do not allocate and more their scsi_hosts since this | |
477 | * is initiated from userspace. | |
478 | */ | |
479 | ||
480 | /* | |
481 | * iSCSI Session's hostdata organization: | |
482 | * | |
483 | * *------------------* <== hostdata_session(host->hostdata) | |
484 | * | ptr to class sess| | |
485 | * |------------------| <== iscsi_hostdata(host->hostdata) | |
486 | * | transport's data | | |
487 | * *------------------* | |
488 | */ | |
489 | ||
490 | #define hostdata_privsize(_t) (sizeof(unsigned long) + _t->hostdata_size + \ | |
491 | _t->hostdata_size % sizeof(unsigned long)) | |
492 | ||
493 | #define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata)) | |
494 | ||
495 | /** | |
496 | * iscsi_transport_create_session - create iscsi cls session and host | |
497 | * scsit: scsi transport template | |
498 | * transport: iscsi transport template | |
499 | * | |
500 | * This can be used by software iscsi_transports that allocate | |
501 | * a session per scsi host. | |
502 | **/ | |
503 | struct Scsi_Host * | |
504 | iscsi_transport_create_session(struct scsi_transport_template *scsit, | |
505 | struct iscsi_transport *transport) | |
506 | { | |
507 | struct iscsi_cls_session *session; | |
508 | struct Scsi_Host *shost; | |
7b7232f3 | 509 | unsigned long flags; |
7b8631b5 MC |
510 | |
511 | shost = scsi_host_alloc(transport->host_template, | |
512 | hostdata_privsize(transport)); | |
513 | if (!shost) { | |
514 | printk(KERN_ERR "iscsi: can not allocate SCSI host for " | |
515 | "session\n"); | |
516 | return NULL; | |
517 | } | |
518 | ||
519 | shost->max_id = 1; | |
520 | shost->max_channel = 0; | |
521 | shost->max_lun = transport->max_lun; | |
522 | shost->max_cmd_len = transport->max_cmd_len; | |
523 | shost->transportt = scsit; | |
55e3299d | 524 | shost->transportt->create_work_queue = 1; |
7b8631b5 MC |
525 | |
526 | if (scsi_add_host(shost, NULL)) | |
527 | goto free_host; | |
528 | ||
30a6c652 | 529 | session = iscsi_create_session(shost, transport, 0); |
7b8631b5 MC |
530 | if (!session) |
531 | goto remove_host; | |
0896b752 | 532 | |
7b8631b5 | 533 | *(unsigned long*)shost->hostdata = (unsigned long)session; |
7b7232f3 MC |
534 | spin_lock_irqsave(&sesslock, flags); |
535 | list_add(&session->sess_list, &sesslist); | |
536 | spin_unlock_irqrestore(&sesslock, flags); | |
7b8631b5 MC |
537 | return shost; |
538 | ||
539 | remove_host: | |
540 | scsi_remove_host(shost); | |
541 | free_host: | |
542 | scsi_host_put(shost); | |
543 | return NULL; | |
544 | } | |
0896b752 | 545 | |
7b8631b5 | 546 | EXPORT_SYMBOL_GPL(iscsi_transport_create_session); |
0896b752 | 547 | |
7b8631b5 MC |
548 | /** |
549 | * iscsi_transport_destroy_session - destroy session and scsi host | |
550 | * shost: scsi host | |
551 | * | |
552 | * This can be used by software iscsi_transports that allocate | |
553 | * a session per scsi host. | |
554 | **/ | |
555 | int iscsi_transport_destroy_session(struct Scsi_Host *shost) | |
556 | { | |
557 | struct iscsi_cls_session *session; | |
7b7232f3 | 558 | unsigned long flags; |
0896b752 | 559 | |
7b8631b5 | 560 | session = hostdata_session(shost->hostdata); |
7b7232f3 MC |
561 | spin_lock_irqsave(&sesslock, flags); |
562 | list_del(&session->sess_list); | |
563 | spin_unlock_irqrestore(&sesslock, flags); | |
7b8631b5 | 564 | iscsi_destroy_session(session); |
30a6c652 MC |
565 | |
566 | scsi_remove_host(shost); | |
7b8631b5 MC |
567 | /* ref from host alloc */ |
568 | scsi_host_put(shost); | |
569 | return 0; | |
570 | } | |
571 | ||
572 | EXPORT_SYMBOL_GPL(iscsi_transport_destroy_session); | |
573 | ||
574 | /* | |
575 | * iscsi interface functions | |
576 | */ | |
0896b752 AA |
577 | static struct iscsi_internal * |
578 | iscsi_if_transport_lookup(struct iscsi_transport *tt) | |
579 | { | |
580 | struct iscsi_internal *priv; | |
581 | unsigned long flags; | |
582 | ||
583 | spin_lock_irqsave(&iscsi_transport_lock, flags); | |
584 | list_for_each_entry(priv, &iscsi_transports, list) { | |
585 | if (tt == priv->iscsi_transport) { | |
586 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
587 | return priv; | |
588 | } | |
589 | } | |
590 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
591 | return NULL; | |
592 | } | |
1da177e4 | 593 | |
0896b752 AA |
594 | static inline struct list_head *skb_to_lh(struct sk_buff *skb) |
595 | { | |
596 | return (struct list_head *)&skb->cb; | |
597 | } | |
1da177e4 | 598 | |
0896b752 | 599 | static void* |
28e5554d | 600 | mempool_zone_alloc_skb(gfp_t gfp_mask, void *pool_data) |
0896b752 AA |
601 | { |
602 | struct mempool_zone *zone = pool_data; | |
1da177e4 | 603 | |
0896b752 | 604 | return alloc_skb(zone->size, gfp_mask); |
1da177e4 LT |
605 | } |
606 | ||
0896b752 AA |
607 | static void |
608 | mempool_zone_free_skb(void *element, void *pool_data) | |
609 | { | |
610 | kfree_skb(element); | |
611 | } | |
1da177e4 | 612 | |
0896b752 AA |
613 | static void |
614 | mempool_zone_complete(struct mempool_zone *zone) | |
615 | { | |
616 | unsigned long flags; | |
617 | struct list_head *lh, *n; | |
1da177e4 | 618 | |
0896b752 AA |
619 | spin_lock_irqsave(&zone->freelock, flags); |
620 | list_for_each_safe(lh, n, &zone->freequeue) { | |
621 | struct sk_buff *skb = (struct sk_buff *)((char *)lh - | |
622 | offsetof(struct sk_buff, cb)); | |
623 | if (!skb_shared(skb)) { | |
624 | list_del(skb_to_lh(skb)); | |
625 | mempool_free(skb, zone->pool); | |
626 | atomic_dec(&zone->allocated); | |
627 | } | |
628 | } | |
629 | spin_unlock_irqrestore(&zone->freelock, flags); | |
1da177e4 LT |
630 | } |
631 | ||
7b8631b5 MC |
632 | static struct mempool_zone * |
633 | mempool_zone_init(unsigned max, unsigned size, unsigned hiwat) | |
0896b752 | 634 | { |
7b8631b5 MC |
635 | struct mempool_zone *zp; |
636 | ||
637 | zp = kzalloc(sizeof(*zp), GFP_KERNEL); | |
638 | if (!zp) | |
639 | return NULL; | |
640 | ||
142e301f MC |
641 | zp->size = size; |
642 | zp->hiwat = hiwat; | |
643 | INIT_LIST_HEAD(&zp->freequeue); | |
644 | spin_lock_init(&zp->freelock); | |
645 | atomic_set(&zp->allocated, 0); | |
646 | ||
0896b752 AA |
647 | zp->pool = mempool_create(max, mempool_zone_alloc_skb, |
648 | mempool_zone_free_skb, zp); | |
7b8631b5 MC |
649 | if (!zp->pool) { |
650 | kfree(zp); | |
651 | return NULL; | |
652 | } | |
1da177e4 | 653 | |
7b8631b5 | 654 | return zp; |
0896b752 AA |
655 | } |
656 | ||
7b8631b5 MC |
657 | static void mempool_zone_destroy(struct mempool_zone *zp) |
658 | { | |
659 | mempool_destroy(zp->pool); | |
660 | kfree(zp); | |
661 | } | |
0896b752 AA |
662 | |
663 | static struct sk_buff* | |
664 | mempool_zone_get_skb(struct mempool_zone *zone) | |
1da177e4 | 665 | { |
0896b752 AA |
666 | struct sk_buff *skb; |
667 | ||
668 | skb = mempool_alloc(zone->pool, GFP_ATOMIC); | |
669 | if (skb) | |
670 | atomic_inc(&zone->allocated); | |
671 | return skb; | |
672 | } | |
1da177e4 | 673 | |
0896b752 AA |
674 | static int |
675 | iscsi_unicast_skb(struct mempool_zone *zone, struct sk_buff *skb) | |
676 | { | |
677 | unsigned long flags; | |
678 | int rc; | |
1da177e4 | 679 | |
0896b752 AA |
680 | skb_get(skb); |
681 | rc = netlink_unicast(nls, skb, daemon_pid, MSG_DONTWAIT); | |
682 | if (rc < 0) { | |
683 | mempool_free(skb, zone->pool); | |
684 | printk(KERN_ERR "iscsi: can not unicast skb (%d)\n", rc); | |
685 | return rc; | |
686 | } | |
687 | ||
688 | spin_lock_irqsave(&zone->freelock, flags); | |
30a6c652 | 689 | INIT_LIST_HEAD(skb_to_lh(skb)); |
0896b752 AA |
690 | list_add(skb_to_lh(skb), &zone->freequeue); |
691 | spin_unlock_irqrestore(&zone->freelock, flags); | |
692 | ||
693 | return 0; | |
1da177e4 | 694 | } |
1da177e4 | 695 | |
7b7232f3 | 696 | int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr, |
0896b752 | 697 | char *data, uint32_t data_size) |
1da177e4 | 698 | { |
0896b752 AA |
699 | struct nlmsghdr *nlh; |
700 | struct sk_buff *skb; | |
701 | struct iscsi_uevent *ev; | |
0896b752 AA |
702 | char *pdu; |
703 | int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) + | |
704 | data_size); | |
705 | ||
7b8631b5 | 706 | mempool_zone_complete(conn->z_pdu); |
0896b752 | 707 | |
7b8631b5 | 708 | skb = mempool_zone_get_skb(conn->z_pdu); |
0896b752 | 709 | if (!skb) { |
7b7232f3 | 710 | iscsi_conn_error(conn, ISCSI_ERR_CONN_FAILED); |
7b8631b5 MC |
711 | dev_printk(KERN_ERR, &conn->dev, "iscsi: can not deliver " |
712 | "control PDU: OOM\n"); | |
0896b752 AA |
713 | return -ENOMEM; |
714 | } | |
1da177e4 | 715 | |
0896b752 AA |
716 | nlh = __nlmsg_put(skb, daemon_pid, 0, 0, (len - sizeof(*nlh)), 0); |
717 | ev = NLMSG_DATA(nlh); | |
718 | memset(ev, 0, sizeof(*ev)); | |
719 | ev->transport_handle = iscsi_handle(conn->transport); | |
720 | ev->type = ISCSI_KEVENT_RECV_PDU; | |
7b8631b5 | 721 | if (atomic_read(&conn->z_pdu->allocated) >= conn->z_pdu->hiwat) |
0896b752 | 722 | ev->iferror = -ENOMEM; |
b5c7a12d MC |
723 | ev->r.recv_req.cid = conn->cid; |
724 | ev->r.recv_req.sid = iscsi_conn_get_sid(conn); | |
0896b752 AA |
725 | pdu = (char*)ev + sizeof(*ev); |
726 | memcpy(pdu, hdr, sizeof(struct iscsi_hdr)); | |
727 | memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size); | |
1da177e4 | 728 | |
7b8631b5 | 729 | return iscsi_unicast_skb(conn->z_pdu, skb); |
1da177e4 | 730 | } |
0896b752 | 731 | EXPORT_SYMBOL_GPL(iscsi_recv_pdu); |
1da177e4 | 732 | |
7b7232f3 | 733 | void iscsi_conn_error(struct iscsi_cls_conn *conn, enum iscsi_err error) |
1da177e4 | 734 | { |
0896b752 AA |
735 | struct nlmsghdr *nlh; |
736 | struct sk_buff *skb; | |
737 | struct iscsi_uevent *ev; | |
0896b752 AA |
738 | int len = NLMSG_SPACE(sizeof(*ev)); |
739 | ||
7b8631b5 | 740 | mempool_zone_complete(conn->z_error); |
0896b752 | 741 | |
7b8631b5 | 742 | skb = mempool_zone_get_skb(conn->z_error); |
0896b752 | 743 | if (!skb) { |
7b8631b5 MC |
744 | dev_printk(KERN_ERR, &conn->dev, "iscsi: gracefully ignored " |
745 | "conn error (%d)\n", error); | |
0896b752 AA |
746 | return; |
747 | } | |
748 | ||
749 | nlh = __nlmsg_put(skb, daemon_pid, 0, 0, (len - sizeof(*nlh)), 0); | |
750 | ev = NLMSG_DATA(nlh); | |
751 | ev->transport_handle = iscsi_handle(conn->transport); | |
752 | ev->type = ISCSI_KEVENT_CONN_ERROR; | |
7b8631b5 | 753 | if (atomic_read(&conn->z_error->allocated) >= conn->z_error->hiwat) |
0896b752 AA |
754 | ev->iferror = -ENOMEM; |
755 | ev->r.connerror.error = error; | |
b5c7a12d MC |
756 | ev->r.connerror.cid = conn->cid; |
757 | ev->r.connerror.sid = iscsi_conn_get_sid(conn); | |
1da177e4 | 758 | |
7b8631b5 | 759 | iscsi_unicast_skb(conn->z_error, skb); |
1da177e4 | 760 | |
7b8631b5 MC |
761 | dev_printk(KERN_INFO, &conn->dev, "iscsi: detected conn error (%d)\n", |
762 | error); | |
0896b752 AA |
763 | } |
764 | EXPORT_SYMBOL_GPL(iscsi_conn_error); | |
765 | ||
766 | static int | |
767 | iscsi_if_send_reply(int pid, int seq, int type, int done, int multi, | |
768 | void *payload, int size) | |
769 | { | |
770 | struct sk_buff *skb; | |
771 | struct nlmsghdr *nlh; | |
772 | int len = NLMSG_SPACE(size); | |
773 | int flags = multi ? NLM_F_MULTI : 0; | |
774 | int t = done ? NLMSG_DONE : type; | |
775 | ||
7b8631b5 | 776 | mempool_zone_complete(z_reply); |
0896b752 | 777 | |
7b8631b5 | 778 | skb = mempool_zone_get_skb(z_reply); |
0896b752 AA |
779 | /* |
780 | * FIXME: | |
781 | * user is supposed to react on iferror == -ENOMEM; | |
782 | * see iscsi_if_rx(). | |
783 | */ | |
784 | BUG_ON(!skb); | |
785 | ||
786 | nlh = __nlmsg_put(skb, pid, seq, t, (len - sizeof(*nlh)), 0); | |
787 | nlh->nlmsg_flags = flags; | |
788 | memcpy(NLMSG_DATA(nlh), payload, size); | |
7b8631b5 | 789 | return iscsi_unicast_skb(z_reply, skb); |
1da177e4 | 790 | } |
1da177e4 | 791 | |
7b8631b5 | 792 | static int |
5b940adf | 793 | iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh) |
7b8631b5 MC |
794 | { |
795 | struct iscsi_uevent *ev = NLMSG_DATA(nlh); | |
796 | struct iscsi_stats *stats; | |
797 | struct sk_buff *skbstat; | |
798 | struct iscsi_cls_conn *conn; | |
799 | struct nlmsghdr *nlhstat; | |
800 | struct iscsi_uevent *evstat; | |
801 | int len = NLMSG_SPACE(sizeof(*ev) + | |
802 | sizeof(struct iscsi_stats) + | |
803 | sizeof(struct iscsi_stats_custom) * | |
804 | ISCSI_STATS_CUSTOM_MAX); | |
805 | int err = 0; | |
0896b752 | 806 | |
b5c7a12d | 807 | conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid); |
7b8631b5 MC |
808 | if (!conn) |
809 | return -EEXIST; | |
0896b752 | 810 | |
7b8631b5 MC |
811 | do { |
812 | int actual_size; | |
0896b752 | 813 | |
7b8631b5 | 814 | mempool_zone_complete(conn->z_pdu); |
0896b752 | 815 | |
7b8631b5 MC |
816 | skbstat = mempool_zone_get_skb(conn->z_pdu); |
817 | if (!skbstat) { | |
818 | dev_printk(KERN_ERR, &conn->dev, "iscsi: can not " | |
819 | "deliver stats: OOM\n"); | |
820 | return -ENOMEM; | |
821 | } | |
822 | ||
823 | nlhstat = __nlmsg_put(skbstat, daemon_pid, 0, 0, | |
824 | (len - sizeof(*nlhstat)), 0); | |
825 | evstat = NLMSG_DATA(nlhstat); | |
826 | memset(evstat, 0, sizeof(*evstat)); | |
827 | evstat->transport_handle = iscsi_handle(conn->transport); | |
828 | evstat->type = nlh->nlmsg_type; | |
829 | if (atomic_read(&conn->z_pdu->allocated) >= conn->z_pdu->hiwat) | |
830 | evstat->iferror = -ENOMEM; | |
b5c7a12d MC |
831 | evstat->u.get_stats.cid = |
832 | ev->u.get_stats.cid; | |
833 | evstat->u.get_stats.sid = | |
834 | ev->u.get_stats.sid; | |
7b8631b5 MC |
835 | stats = (struct iscsi_stats *) |
836 | ((char*)evstat + sizeof(*evstat)); | |
837 | memset(stats, 0, sizeof(*stats)); | |
838 | ||
7b7232f3 | 839 | transport->get_stats(conn, stats); |
7b8631b5 MC |
840 | actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) + |
841 | sizeof(struct iscsi_stats) + | |
842 | sizeof(struct iscsi_stats_custom) * | |
843 | stats->custom_length); | |
844 | actual_size -= sizeof(*nlhstat); | |
845 | actual_size = NLMSG_LENGTH(actual_size); | |
5b940adf | 846 | skb_trim(skbstat, NLMSG_ALIGN(actual_size)); |
7b8631b5 MC |
847 | nlhstat->nlmsg_len = actual_size; |
848 | ||
849 | err = iscsi_unicast_skb(conn->z_pdu, skbstat); | |
850 | } while (err < 0 && err != -ECONNREFUSED); | |
851 | ||
852 | return err; | |
0896b752 AA |
853 | } |
854 | ||
855 | static int | |
856 | iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_uevent *ev) | |
857 | { | |
858 | struct iscsi_transport *transport = priv->iscsi_transport; | |
7b7232f3 | 859 | struct iscsi_cls_session *session; |
b5c7a12d | 860 | uint32_t hostno; |
0896b752 | 861 | |
7b7232f3 MC |
862 | session = transport->create_session(&priv->t, |
863 | ev->u.c_session.initial_cmdsn, | |
b5c7a12d | 864 | &hostno); |
7b7232f3 | 865 | if (!session) |
7b8631b5 | 866 | return -ENOMEM; |
0896b752 | 867 | |
b5c7a12d MC |
868 | ev->r.c_session_ret.host_no = hostno; |
869 | ev->r.c_session_ret.sid = session->sid; | |
0896b752 | 870 | return 0; |
0896b752 AA |
871 | } |
872 | ||
873 | static int | |
7b7232f3 | 874 | iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev) |
0896b752 | 875 | { |
7b8631b5 | 876 | struct iscsi_cls_conn *conn; |
7b7232f3 | 877 | struct iscsi_cls_session *session; |
0896b752 | 878 | unsigned long flags; |
7b8631b5 | 879 | |
b5c7a12d MC |
880 | session = iscsi_session_lookup(ev->u.c_conn.sid); |
881 | if (!session) { | |
882 | printk(KERN_ERR "iscsi: invalid session %d\n", | |
883 | ev->u.c_conn.sid); | |
7b8631b5 | 884 | return -EINVAL; |
b5c7a12d | 885 | } |
0896b752 | 886 | |
7b7232f3 | 887 | conn = transport->create_conn(session, ev->u.c_conn.cid); |
b5c7a12d MC |
888 | if (!conn) { |
889 | printk(KERN_ERR "iscsi: couldn't create a new " | |
890 | "connection for session %d\n", | |
891 | session->sid); | |
7b7232f3 | 892 | return -ENOMEM; |
b5c7a12d | 893 | } |
0896b752 | 894 | |
7b8631b5 | 895 | conn->z_pdu = mempool_zone_init(Z_MAX_PDU, |
0896b752 AA |
896 | NLMSG_SPACE(sizeof(struct iscsi_uevent) + |
897 | sizeof(struct iscsi_hdr) + | |
898 | DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH), | |
899 | Z_HIWAT_PDU); | |
7b8631b5 MC |
900 | if (!conn->z_pdu) { |
901 | dev_printk(KERN_ERR, &conn->dev, "iscsi: can not allocate " | |
902 | "pdu zone for new conn\n"); | |
903 | goto destroy_conn; | |
0896b752 | 904 | } |
7b8631b5 MC |
905 | |
906 | conn->z_error = mempool_zone_init(Z_MAX_ERROR, | |
0896b752 AA |
907 | NLMSG_SPACE(sizeof(struct iscsi_uevent)), |
908 | Z_HIWAT_ERROR); | |
7b8631b5 MC |
909 | if (!conn->z_error) { |
910 | dev_printk(KERN_ERR, &conn->dev, "iscsi: can not allocate " | |
911 | "error zone for new conn\n"); | |
912 | goto free_pdu_pool; | |
0896b752 AA |
913 | } |
914 | ||
b5c7a12d MC |
915 | ev->r.c_conn_ret.sid = session->sid; |
916 | ev->r.c_conn_ret.cid = conn->cid; | |
0896b752 AA |
917 | |
918 | spin_lock_irqsave(&connlock, flags); | |
919 | list_add(&conn->conn_list, &connlist); | |
0896b752 AA |
920 | conn->active = 1; |
921 | spin_unlock_irqrestore(&connlock, flags); | |
922 | ||
0896b752 AA |
923 | return 0; |
924 | ||
7b8631b5 MC |
925 | free_pdu_pool: |
926 | mempool_zone_destroy(conn->z_pdu); | |
927 | destroy_conn: | |
928 | if (transport->destroy_conn) | |
929 | transport->destroy_conn(conn->dd_data); | |
7b8631b5 | 930 | return -ENOMEM; |
1da177e4 LT |
931 | } |
932 | ||
0896b752 AA |
933 | static int |
934 | iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev) | |
935 | { | |
936 | unsigned long flags; | |
7b8631b5 MC |
937 | struct iscsi_cls_conn *conn; |
938 | struct mempool_zone *z_error, *z_pdu; | |
0896b752 | 939 | |
b5c7a12d | 940 | conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid); |
0896b752 | 941 | if (!conn) |
7b8631b5 | 942 | return -EINVAL; |
0896b752 AA |
943 | spin_lock_irqsave(&connlock, flags); |
944 | conn->active = 0; | |
945 | list_del(&conn->conn_list); | |
946 | spin_unlock_irqrestore(&connlock, flags); | |
947 | ||
7b8631b5 MC |
948 | z_pdu = conn->z_pdu; |
949 | z_error = conn->z_error; | |
0896b752 | 950 | |
7b8631b5 MC |
951 | if (transport->destroy_conn) |
952 | transport->destroy_conn(conn); | |
0896b752 | 953 | |
7b8631b5 MC |
954 | mempool_zone_destroy(z_pdu); |
955 | mempool_zone_destroy(z_error); | |
0896b752 | 956 | |
7b8631b5 | 957 | return 0; |
0896b752 AA |
958 | } |
959 | ||
fd7255f5 MC |
960 | static void |
961 | iscsi_copy_param(struct iscsi_uevent *ev, uint32_t *value, char *data) | |
962 | { | |
963 | if (ev->u.set_param.len != sizeof(uint32_t)) | |
964 | BUG(); | |
965 | memcpy(value, data, min_t(uint32_t, sizeof(uint32_t), | |
966 | ev->u.set_param.len)); | |
967 | } | |
968 | ||
969 | static int | |
970 | iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev) | |
971 | { | |
972 | char *data = (char*)ev + sizeof(*ev); | |
973 | struct iscsi_cls_conn *conn; | |
974 | struct iscsi_cls_session *session; | |
975 | int err = 0; | |
976 | uint32_t value = 0; | |
977 | ||
978 | session = iscsi_session_lookup(ev->u.set_param.sid); | |
979 | conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid); | |
980 | if (!conn || !session) | |
981 | return -EINVAL; | |
982 | ||
983 | switch (ev->u.set_param.param) { | |
30a6c652 MC |
984 | case ISCSI_PARAM_SESS_RECOVERY_TMO: |
985 | iscsi_copy_param(ev, &value, data); | |
986 | if (value != 0) | |
987 | session->recovery_tmo = value; | |
988 | break; | |
fd7255f5 MC |
989 | case ISCSI_PARAM_TARGET_NAME: |
990 | /* this should not change between logins */ | |
991 | if (session->targetname) | |
992 | return 0; | |
993 | ||
994 | session->targetname = kstrdup(data, GFP_KERNEL); | |
995 | if (!session->targetname) | |
996 | return -ENOMEM; | |
997 | break; | |
998 | case ISCSI_PARAM_TPGT: | |
999 | iscsi_copy_param(ev, &value, data); | |
1000 | session->tpgt = value; | |
1001 | break; | |
1002 | case ISCSI_PARAM_PERSISTENT_PORT: | |
1003 | iscsi_copy_param(ev, &value, data); | |
1004 | conn->persistent_port = value; | |
1005 | break; | |
1006 | case ISCSI_PARAM_PERSISTENT_ADDRESS: | |
1007 | /* | |
1008 | * this is the address returned in discovery so it should | |
1009 | * not change between logins. | |
1010 | */ | |
1011 | if (conn->persistent_address) | |
1012 | return 0; | |
1013 | ||
1014 | conn->persistent_address = kstrdup(data, GFP_KERNEL); | |
1015 | if (!conn->persistent_address) | |
1016 | return -ENOMEM; | |
1017 | break; | |
1018 | default: | |
1019 | iscsi_copy_param(ev, &value, data); | |
1020 | err = transport->set_param(conn, ev->u.set_param.param, value); | |
1021 | } | |
1022 | ||
1023 | return err; | |
1024 | } | |
1025 | ||
0896b752 AA |
1026 | static int |
1027 | iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) | |
1028 | { | |
1029 | int err = 0; | |
1030 | struct iscsi_uevent *ev = NLMSG_DATA(nlh); | |
1031 | struct iscsi_transport *transport = NULL; | |
1032 | struct iscsi_internal *priv; | |
7b7232f3 MC |
1033 | struct iscsi_cls_session *session; |
1034 | struct iscsi_cls_conn *conn; | |
0896b752 | 1035 | |
0896b752 AA |
1036 | priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle)); |
1037 | if (!priv) | |
1038 | return -EINVAL; | |
1039 | transport = priv->iscsi_transport; | |
1040 | ||
7b7232f3 MC |
1041 | if (!try_module_get(transport->owner)) |
1042 | return -EINVAL; | |
1043 | ||
0896b752 AA |
1044 | switch (nlh->nlmsg_type) { |
1045 | case ISCSI_UEVENT_CREATE_SESSION: | |
1046 | err = iscsi_if_create_session(priv, ev); | |
1047 | break; | |
1048 | case ISCSI_UEVENT_DESTROY_SESSION: | |
b5c7a12d | 1049 | session = iscsi_session_lookup(ev->u.d_session.sid); |
7b7232f3 MC |
1050 | if (session) |
1051 | transport->destroy_session(session); | |
1052 | else | |
1053 | err = -EINVAL; | |
0896b752 AA |
1054 | break; |
1055 | case ISCSI_UEVENT_CREATE_CONN: | |
1056 | err = iscsi_if_create_conn(transport, ev); | |
1057 | break; | |
1058 | case ISCSI_UEVENT_DESTROY_CONN: | |
1059 | err = iscsi_if_destroy_conn(transport, ev); | |
1060 | break; | |
1061 | case ISCSI_UEVENT_BIND_CONN: | |
b5c7a12d MC |
1062 | session = iscsi_session_lookup(ev->u.b_conn.sid); |
1063 | conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid); | |
7b7232f3 MC |
1064 | |
1065 | if (session && conn) | |
1066 | ev->r.retcode = transport->bind_conn(session, conn, | |
1067 | ev->u.b_conn.transport_fd, | |
1068 | ev->u.b_conn.is_leading); | |
1069 | else | |
1070 | err = -EINVAL; | |
0896b752 AA |
1071 | break; |
1072 | case ISCSI_UEVENT_SET_PARAM: | |
fd7255f5 | 1073 | err = iscsi_set_param(transport, ev); |
0896b752 AA |
1074 | break; |
1075 | case ISCSI_UEVENT_START_CONN: | |
b5c7a12d | 1076 | conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid); |
7b7232f3 MC |
1077 | if (conn) |
1078 | ev->r.retcode = transport->start_conn(conn); | |
1079 | else | |
1080 | err = -EINVAL; | |
0896b752 AA |
1081 | break; |
1082 | case ISCSI_UEVENT_STOP_CONN: | |
b5c7a12d | 1083 | conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid); |
7b7232f3 MC |
1084 | if (conn) |
1085 | transport->stop_conn(conn, ev->u.stop_conn.flag); | |
1086 | else | |
1087 | err = -EINVAL; | |
0896b752 AA |
1088 | break; |
1089 | case ISCSI_UEVENT_SEND_PDU: | |
b5c7a12d | 1090 | conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid); |
7b7232f3 MC |
1091 | if (conn) |
1092 | ev->r.retcode = transport->send_pdu(conn, | |
1093 | (struct iscsi_hdr*)((char*)ev + sizeof(*ev)), | |
1094 | (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size, | |
1095 | ev->u.send_pdu.data_size); | |
1096 | else | |
1097 | err = -EINVAL; | |
0896b752 AA |
1098 | break; |
1099 | case ISCSI_UEVENT_GET_STATS: | |
5b940adf | 1100 | err = iscsi_if_get_stats(transport, nlh); |
0896b752 AA |
1101 | break; |
1102 | default: | |
1103 | err = -EINVAL; | |
1104 | break; | |
1105 | } | |
1106 | ||
7b7232f3 | 1107 | module_put(transport->owner); |
0896b752 AA |
1108 | return err; |
1109 | } | |
1110 | ||
b5c7a12d MC |
1111 | /* |
1112 | * Get message from skb (based on rtnetlink_rcv_skb). Each message is | |
1113 | * processed by iscsi_if_recv_msg. Malformed skbs with wrong lengths or | |
1114 | * invalid creds are discarded silently. | |
1115 | */ | |
0896b752 AA |
1116 | static void |
1117 | iscsi_if_rx(struct sock *sk, int len) | |
1118 | { | |
1119 | struct sk_buff *skb; | |
1da177e4 | 1120 | |
0b950672 | 1121 | mutex_lock(&rx_queue_mutex); |
0896b752 | 1122 | while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { |
ee7f8e40 MC |
1123 | if (NETLINK_CREDS(skb)->uid) { |
1124 | skb_pull(skb, skb->len); | |
1125 | goto free_skb; | |
1126 | } | |
1127 | daemon_pid = NETLINK_CREDS(skb)->pid; | |
1128 | ||
0896b752 AA |
1129 | while (skb->len >= NLMSG_SPACE(0)) { |
1130 | int err; | |
1131 | uint32_t rlen; | |
1132 | struct nlmsghdr *nlh; | |
1133 | struct iscsi_uevent *ev; | |
1134 | ||
1135 | nlh = (struct nlmsghdr *)skb->data; | |
1136 | if (nlh->nlmsg_len < sizeof(*nlh) || | |
1137 | skb->len < nlh->nlmsg_len) { | |
1138 | break; | |
1139 | } | |
ee7f8e40 | 1140 | |
0896b752 AA |
1141 | ev = NLMSG_DATA(nlh); |
1142 | rlen = NLMSG_ALIGN(nlh->nlmsg_len); | |
1143 | if (rlen > skb->len) | |
1144 | rlen = skb->len; | |
ee7f8e40 | 1145 | |
0896b752 AA |
1146 | err = iscsi_if_recv_msg(skb, nlh); |
1147 | if (err) { | |
1148 | ev->type = ISCSI_KEVENT_IF_ERROR; | |
1149 | ev->iferror = err; | |
1150 | } | |
1151 | do { | |
1152 | /* | |
1153 | * special case for GET_STATS: | |
1154 | * on success - sending reply and stats from | |
1155 | * inside of if_recv_msg(), | |
1156 | * on error - fall through. | |
1157 | */ | |
1158 | if (ev->type == ISCSI_UEVENT_GET_STATS && !err) | |
1159 | break; | |
1160 | err = iscsi_if_send_reply( | |
1161 | NETLINK_CREDS(skb)->pid, nlh->nlmsg_seq, | |
1162 | nlh->nlmsg_type, 0, 0, ev, sizeof(*ev)); | |
7b8631b5 MC |
1163 | if (atomic_read(&z_reply->allocated) >= |
1164 | z_reply->hiwat) | |
0896b752 AA |
1165 | ev->iferror = -ENOMEM; |
1166 | } while (err < 0 && err != -ECONNREFUSED); | |
1167 | skb_pull(skb, rlen); | |
1168 | } | |
ee7f8e40 | 1169 | free_skb: |
0896b752 AA |
1170 | kfree_skb(skb); |
1171 | } | |
0b950672 | 1172 | mutex_unlock(&rx_queue_mutex); |
0896b752 | 1173 | } |
1da177e4 | 1174 | |
7b8631b5 MC |
1175 | #define iscsi_cdev_to_conn(_cdev) \ |
1176 | iscsi_dev_to_conn(_cdev->dev) | |
1177 | ||
fd7255f5 MC |
1178 | #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \ |
1179 | struct class_device_attribute class_device_attr_##_prefix##_##_name = \ | |
1180 | __ATTR(_name,_mode,_show,_store) | |
1181 | ||
1da177e4 | 1182 | /* |
0896b752 | 1183 | * iSCSI connection attrs |
1da177e4 | 1184 | */ |
0896b752 AA |
1185 | #define iscsi_conn_int_attr_show(param, format) \ |
1186 | static ssize_t \ | |
1187 | show_conn_int_param_##param(struct class_device *cdev, char *buf) \ | |
1188 | { \ | |
1189 | uint32_t value = 0; \ | |
7b8631b5 MC |
1190 | struct iscsi_cls_conn *conn = iscsi_cdev_to_conn(cdev); \ |
1191 | struct iscsi_transport *t = conn->transport; \ | |
0896b752 | 1192 | \ |
7b7232f3 | 1193 | t->get_conn_param(conn, param, &value); \ |
0896b752 AA |
1194 | return snprintf(buf, 20, format"\n", value); \ |
1195 | } | |
1196 | ||
1197 | #define iscsi_conn_int_attr(field, param, format) \ | |
1198 | iscsi_conn_int_attr_show(param, format) \ | |
fd7255f5 MC |
1199 | static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_int_param_##param, \ |
1200 | NULL); | |
0896b752 AA |
1201 | |
1202 | iscsi_conn_int_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH, "%u"); | |
1203 | iscsi_conn_int_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH, "%u"); | |
1204 | iscsi_conn_int_attr(header_digest, ISCSI_PARAM_HDRDGST_EN, "%d"); | |
1205 | iscsi_conn_int_attr(data_digest, ISCSI_PARAM_DATADGST_EN, "%d"); | |
1206 | iscsi_conn_int_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN, "%d"); | |
1207 | iscsi_conn_int_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN, "%d"); | |
fd7255f5 MC |
1208 | iscsi_conn_int_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT, "%d"); |
1209 | iscsi_conn_int_attr(port, ISCSI_PARAM_CONN_PORT, "%d"); | |
1210 | ||
1211 | #define iscsi_conn_str_attr_show(param) \ | |
1212 | static ssize_t \ | |
1213 | show_conn_str_param_##param(struct class_device *cdev, char *buf) \ | |
1214 | { \ | |
1215 | struct iscsi_cls_conn *conn = iscsi_cdev_to_conn(cdev); \ | |
1216 | struct iscsi_transport *t = conn->transport; \ | |
1217 | return t->get_conn_str_param(conn, param, buf); \ | |
1218 | } | |
1219 | ||
1220 | #define iscsi_conn_str_attr(field, param) \ | |
1221 | iscsi_conn_str_attr_show(param) \ | |
1222 | static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_str_param_##param, \ | |
1223 | NULL); | |
1224 | ||
1225 | iscsi_conn_str_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS); | |
1226 | iscsi_conn_str_attr(address, ISCSI_PARAM_CONN_ADDRESS); | |
1da177e4 | 1227 | |
7b8631b5 MC |
1228 | #define iscsi_cdev_to_session(_cdev) \ |
1229 | iscsi_dev_to_session(_cdev->dev) | |
1230 | ||
1da177e4 | 1231 | /* |
0896b752 | 1232 | * iSCSI session attrs |
1da177e4 | 1233 | */ |
0896b752 | 1234 | #define iscsi_session_int_attr_show(param, format) \ |
1da177e4 | 1235 | static ssize_t \ |
0896b752 | 1236 | show_session_int_param_##param(struct class_device *cdev, char *buf) \ |
1da177e4 | 1237 | { \ |
0896b752 | 1238 | uint32_t value = 0; \ |
7b8631b5 | 1239 | struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev); \ |
7b8631b5 | 1240 | struct iscsi_transport *t = session->transport; \ |
1da177e4 | 1241 | \ |
7b7232f3 | 1242 | t->get_session_param(session, param, &value); \ |
0896b752 | 1243 | return snprintf(buf, 20, format"\n", value); \ |
1da177e4 LT |
1244 | } |
1245 | ||
0896b752 AA |
1246 | #define iscsi_session_int_attr(field, param, format) \ |
1247 | iscsi_session_int_attr_show(param, format) \ | |
fd7255f5 MC |
1248 | static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_int_param_##param, \ |
1249 | NULL); | |
1da177e4 | 1250 | |
0896b752 AA |
1251 | iscsi_session_int_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, "%d"); |
1252 | iscsi_session_int_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, "%hu"); | |
1253 | iscsi_session_int_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, "%d"); | |
1254 | iscsi_session_int_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, "%u"); | |
1255 | iscsi_session_int_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, "%u"); | |
1256 | iscsi_session_int_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, "%d"); | |
1257 | iscsi_session_int_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, "%d"); | |
1258 | iscsi_session_int_attr(erl, ISCSI_PARAM_ERL, "%d"); | |
fd7255f5 | 1259 | iscsi_session_int_attr(tpgt, ISCSI_PARAM_TPGT, "%d"); |
1da177e4 | 1260 | |
fd7255f5 MC |
1261 | #define iscsi_session_str_attr_show(param) \ |
1262 | static ssize_t \ | |
1263 | show_session_str_param_##param(struct class_device *cdev, char *buf) \ | |
1264 | { \ | |
1265 | struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev); \ | |
1266 | struct iscsi_transport *t = session->transport; \ | |
1267 | return t->get_session_str_param(session, param, buf); \ | |
1268 | } | |
1269 | ||
1270 | #define iscsi_session_str_attr(field, param) \ | |
1271 | iscsi_session_str_attr_show(param) \ | |
1272 | static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_str_param_##param, \ | |
1273 | NULL); | |
1274 | ||
1275 | iscsi_session_str_attr(targetname, ISCSI_PARAM_TARGET_NAME); | |
1da177e4 | 1276 | |
fd7255f5 MC |
1277 | /* |
1278 | * Private session and conn attrs. userspace uses several iscsi values | |
1279 | * to identify each session between reboots. Some of these values may not | |
1280 | * be present in the iscsi_transport/LLD driver becuase userspace handles | |
1281 | * login (and failback for login redirect) so for these type of drivers | |
1282 | * the class manages the attrs and values for the iscsi_transport/LLD | |
1283 | */ | |
1284 | #define iscsi_priv_session_attr_show(field, format) \ | |
1285 | static ssize_t \ | |
1286 | show_priv_session_##field(struct class_device *cdev, char *buf) \ | |
1287 | { \ | |
1288 | struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev); \ | |
1289 | return sprintf(buf, format"\n", session->field); \ | |
1290 | } | |
1291 | ||
1292 | #define iscsi_priv_session_attr(field, format) \ | |
1293 | iscsi_priv_session_attr_show(field, format) \ | |
1294 | static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO, show_priv_session_##field, \ | |
1295 | NULL) | |
1296 | iscsi_priv_session_attr(targetname, "%s"); | |
1297 | iscsi_priv_session_attr(tpgt, "%d"); | |
30a6c652 | 1298 | iscsi_priv_session_attr(recovery_tmo, "%d"); |
fd7255f5 MC |
1299 | |
1300 | #define iscsi_priv_conn_attr_show(field, format) \ | |
1301 | static ssize_t \ | |
1302 | show_priv_conn_##field(struct class_device *cdev, char *buf) \ | |
1303 | { \ | |
1304 | struct iscsi_cls_conn *conn = iscsi_cdev_to_conn(cdev); \ | |
1305 | return sprintf(buf, format"\n", conn->field); \ | |
1306 | } | |
1307 | ||
1308 | #define iscsi_priv_conn_attr(field, format) \ | |
1309 | iscsi_priv_conn_attr_show(field, format) \ | |
1310 | static ISCSI_CLASS_ATTR(priv_conn, field, S_IRUGO, show_priv_conn_##field, \ | |
1311 | NULL) | |
1312 | iscsi_priv_conn_attr(persistent_address, "%s"); | |
1313 | iscsi_priv_conn_attr(persistent_port, "%d"); | |
1314 | ||
1315 | #define SETUP_PRIV_SESSION_RD_ATTR(field) \ | |
1316 | do { \ | |
1317 | priv->session_attrs[count] = &class_device_attr_priv_sess_##field; \ | |
1318 | count++; \ | |
1319 | } while (0) | |
1320 | ||
1321 | #define SETUP_SESSION_RD_ATTR(field, param_flag) \ | |
1322 | do { \ | |
1323 | if (tt->param_mask & param_flag) { \ | |
1324 | priv->session_attrs[count] = &class_device_attr_sess_##field; \ | |
1da177e4 | 1325 | count++; \ |
fd7255f5 MC |
1326 | } \ |
1327 | } while (0) | |
1328 | ||
1329 | #define SETUP_PRIV_CONN_RD_ATTR(field) \ | |
1330 | do { \ | |
1331 | priv->conn_attrs[count] = &class_device_attr_priv_conn_##field; \ | |
1332 | count++; \ | |
1333 | } while (0) | |
1334 | ||
1335 | #define SETUP_CONN_RD_ATTR(field, param_flag) \ | |
1336 | do { \ | |
1337 | if (tt->param_mask & param_flag) { \ | |
1338 | priv->conn_attrs[count] = &class_device_attr_conn_##field; \ | |
1339 | count++; \ | |
1340 | } \ | |
1341 | } while (0) | |
1da177e4 | 1342 | |
0896b752 AA |
1343 | static int iscsi_session_match(struct attribute_container *cont, |
1344 | struct device *dev) | |
1da177e4 | 1345 | { |
7b8631b5 | 1346 | struct iscsi_cls_session *session; |
1da177e4 | 1347 | struct Scsi_Host *shost; |
0896b752 AA |
1348 | struct iscsi_internal *priv; |
1349 | ||
1350 | if (!iscsi_is_session_dev(dev)) | |
1351 | return 0; | |
1da177e4 | 1352 | |
7b8631b5 MC |
1353 | session = iscsi_dev_to_session(dev); |
1354 | shost = iscsi_session_to_shost(session); | |
0896b752 | 1355 | if (!shost->transportt) |
1da177e4 LT |
1356 | return 0; |
1357 | ||
0896b752 AA |
1358 | priv = to_iscsi_internal(shost->transportt); |
1359 | if (priv->session_cont.ac.class != &iscsi_session_class.class) | |
1da177e4 LT |
1360 | return 0; |
1361 | ||
0896b752 | 1362 | return &priv->session_cont.ac == cont; |
1da177e4 LT |
1363 | } |
1364 | ||
0896b752 AA |
1365 | static int iscsi_conn_match(struct attribute_container *cont, |
1366 | struct device *dev) | |
1367 | { | |
7b8631b5 MC |
1368 | struct iscsi_cls_session *session; |
1369 | struct iscsi_cls_conn *conn; | |
1da177e4 | 1370 | struct Scsi_Host *shost; |
0896b752 | 1371 | struct iscsi_internal *priv; |
1da177e4 | 1372 | |
0896b752 | 1373 | if (!iscsi_is_conn_dev(dev)) |
1da177e4 LT |
1374 | return 0; |
1375 | ||
7b8631b5 MC |
1376 | conn = iscsi_dev_to_conn(dev); |
1377 | session = iscsi_dev_to_session(conn->dev.parent); | |
1378 | shost = iscsi_session_to_shost(session); | |
1379 | ||
0896b752 | 1380 | if (!shost->transportt) |
1da177e4 LT |
1381 | return 0; |
1382 | ||
0896b752 AA |
1383 | priv = to_iscsi_internal(shost->transportt); |
1384 | if (priv->conn_cont.ac.class != &iscsi_connection_class.class) | |
1385 | return 0; | |
1da177e4 | 1386 | |
0896b752 AA |
1387 | return &priv->conn_cont.ac == cont; |
1388 | } | |
1389 | ||
30a6c652 MC |
1390 | static int iscsi_host_match(struct attribute_container *cont, |
1391 | struct device *dev) | |
1392 | { | |
1393 | struct Scsi_Host *shost; | |
1394 | struct iscsi_internal *priv; | |
1395 | ||
1396 | if (!scsi_is_host_device(dev)) | |
1397 | return 0; | |
1398 | ||
1399 | shost = dev_to_shost(dev); | |
1400 | if (!shost->transportt || | |
1401 | shost->transportt->host_attrs.ac.class != &iscsi_host_class.class) | |
1402 | return 0; | |
1403 | ||
1404 | priv = to_iscsi_internal(shost->transportt); | |
1405 | return &priv->t.host_attrs.ac == cont; | |
1406 | } | |
1407 | ||
7b8631b5 MC |
1408 | struct scsi_transport_template * |
1409 | iscsi_register_transport(struct iscsi_transport *tt) | |
0896b752 AA |
1410 | { |
1411 | struct iscsi_internal *priv; | |
1412 | unsigned long flags; | |
1413 | int count = 0, err; | |
1414 | ||
1415 | BUG_ON(!tt); | |
1416 | ||
1417 | priv = iscsi_if_transport_lookup(tt); | |
1418 | if (priv) | |
7b8631b5 | 1419 | return NULL; |
0896b752 | 1420 | |
24669f75 | 1421 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
0896b752 | 1422 | if (!priv) |
7b8631b5 | 1423 | return NULL; |
0896b752 | 1424 | INIT_LIST_HEAD(&priv->list); |
0896b752 | 1425 | priv->iscsi_transport = tt; |
30a6c652 | 1426 | priv->t.user_scan = iscsi_user_scan; |
0896b752 AA |
1427 | |
1428 | priv->cdev.class = &iscsi_transport_class; | |
1429 | snprintf(priv->cdev.class_id, BUS_ID_SIZE, "%s", tt->name); | |
1430 | err = class_device_register(&priv->cdev); | |
1431 | if (err) | |
1432 | goto free_priv; | |
1433 | ||
1434 | err = sysfs_create_group(&priv->cdev.kobj, &iscsi_transport_group); | |
1435 | if (err) | |
1436 | goto unregister_cdev; | |
1437 | ||
30a6c652 MC |
1438 | /* host parameters */ |
1439 | priv->t.host_attrs.ac.attrs = &priv->host_attrs[0]; | |
1440 | priv->t.host_attrs.ac.class = &iscsi_host_class.class; | |
1441 | priv->t.host_attrs.ac.match = iscsi_host_match; | |
1442 | priv->t.host_size = sizeof(struct iscsi_host); | |
1443 | priv->host_attrs[0] = NULL; | |
1444 | transport_container_register(&priv->t.host_attrs); | |
1445 | ||
0896b752 AA |
1446 | /* connection parameters */ |
1447 | priv->conn_cont.ac.attrs = &priv->conn_attrs[0]; | |
1448 | priv->conn_cont.ac.class = &iscsi_connection_class.class; | |
1449 | priv->conn_cont.ac.match = iscsi_conn_match; | |
1450 | transport_container_register(&priv->conn_cont); | |
1da177e4 | 1451 | |
fd7255f5 MC |
1452 | SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_MAX_RECV_DLENGTH); |
1453 | SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_MAX_XMIT_DLENGTH); | |
1454 | SETUP_CONN_RD_ATTR(header_digest, ISCSI_HDRDGST_EN); | |
1455 | SETUP_CONN_RD_ATTR(data_digest, ISCSI_DATADGST_EN); | |
1456 | SETUP_CONN_RD_ATTR(ifmarker, ISCSI_IFMARKER_EN); | |
1457 | SETUP_CONN_RD_ATTR(ofmarker, ISCSI_OFMARKER_EN); | |
1458 | SETUP_CONN_RD_ATTR(address, ISCSI_CONN_ADDRESS); | |
1459 | SETUP_CONN_RD_ATTR(port, ISCSI_CONN_PORT); | |
1460 | ||
1461 | if (tt->param_mask & ISCSI_PERSISTENT_ADDRESS) | |
1462 | SETUP_CONN_RD_ATTR(persistent_address, ISCSI_PERSISTENT_ADDRESS); | |
1463 | else | |
1464 | SETUP_PRIV_CONN_RD_ATTR(persistent_address); | |
1465 | ||
1466 | if (tt->param_mask & ISCSI_PERSISTENT_PORT) | |
1467 | SETUP_CONN_RD_ATTR(persistent_port, ISCSI_PERSISTENT_PORT); | |
1468 | else | |
1469 | SETUP_PRIV_CONN_RD_ATTR(persistent_port); | |
0896b752 AA |
1470 | |
1471 | BUG_ON(count > ISCSI_CONN_ATTRS); | |
1472 | priv->conn_attrs[count] = NULL; | |
1da177e4 | 1473 | count = 0; |
1da177e4 | 1474 | |
0896b752 AA |
1475 | /* session parameters */ |
1476 | priv->session_cont.ac.attrs = &priv->session_attrs[0]; | |
1477 | priv->session_cont.ac.class = &iscsi_session_class.class; | |
1478 | priv->session_cont.ac.match = iscsi_session_match; | |
1479 | transport_container_register(&priv->session_cont); | |
1480 | ||
fd7255f5 MC |
1481 | SETUP_SESSION_RD_ATTR(initial_r2t, ISCSI_INITIAL_R2T_EN); |
1482 | SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_MAX_R2T); | |
1483 | SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_IMM_DATA_EN); | |
1484 | SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_FIRST_BURST); | |
1485 | SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_MAX_BURST); | |
1486 | SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PDU_INORDER_EN); | |
1487 | SETUP_SESSION_RD_ATTR(data_seq_in_order, ISCSI_DATASEQ_INORDER_EN); | |
1488 | SETUP_SESSION_RD_ATTR(erl, ISCSI_ERL); | |
30a6c652 | 1489 | SETUP_PRIV_SESSION_RD_ATTR(recovery_tmo); |
fd7255f5 MC |
1490 | |
1491 | if (tt->param_mask & ISCSI_TARGET_NAME) | |
1492 | SETUP_SESSION_RD_ATTR(targetname, ISCSI_TARGET_NAME); | |
1493 | else | |
1494 | SETUP_PRIV_SESSION_RD_ATTR(targetname); | |
1495 | ||
1496 | if (tt->param_mask & ISCSI_TPGT) | |
1497 | SETUP_SESSION_RD_ATTR(tpgt, ISCSI_TPGT); | |
1498 | else | |
1499 | SETUP_PRIV_SESSION_RD_ATTR(tpgt); | |
0896b752 AA |
1500 | |
1501 | BUG_ON(count > ISCSI_SESSION_ATTRS); | |
1502 | priv->session_attrs[count] = NULL; | |
1503 | ||
1504 | spin_lock_irqsave(&iscsi_transport_lock, flags); | |
1505 | list_add(&priv->list, &iscsi_transports); | |
1506 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
1507 | ||
1508 | printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name); | |
7b8631b5 | 1509 | return &priv->t; |
1da177e4 | 1510 | |
0896b752 AA |
1511 | unregister_cdev: |
1512 | class_device_unregister(&priv->cdev); | |
1513 | free_priv: | |
1514 | kfree(priv); | |
7b8631b5 | 1515 | return NULL; |
1da177e4 | 1516 | } |
0896b752 AA |
1517 | EXPORT_SYMBOL_GPL(iscsi_register_transport); |
1518 | ||
1519 | int iscsi_unregister_transport(struct iscsi_transport *tt) | |
1520 | { | |
1521 | struct iscsi_internal *priv; | |
1522 | unsigned long flags; | |
1523 | ||
1524 | BUG_ON(!tt); | |
1525 | ||
0b950672 | 1526 | mutex_lock(&rx_queue_mutex); |
0896b752 AA |
1527 | |
1528 | priv = iscsi_if_transport_lookup(tt); | |
1529 | BUG_ON (!priv); | |
1530 | ||
0896b752 AA |
1531 | spin_lock_irqsave(&iscsi_transport_lock, flags); |
1532 | list_del(&priv->list); | |
1533 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
1534 | ||
1535 | transport_container_unregister(&priv->conn_cont); | |
1536 | transport_container_unregister(&priv->session_cont); | |
30a6c652 | 1537 | transport_container_unregister(&priv->t.host_attrs); |
0896b752 AA |
1538 | |
1539 | sysfs_remove_group(&priv->cdev.kobj, &iscsi_transport_group); | |
1540 | class_device_unregister(&priv->cdev); | |
0b950672 | 1541 | mutex_unlock(&rx_queue_mutex); |
1da177e4 | 1542 | |
0896b752 AA |
1543 | return 0; |
1544 | } | |
1545 | EXPORT_SYMBOL_GPL(iscsi_unregister_transport); | |
1da177e4 | 1546 | |
0896b752 AA |
1547 | static int |
1548 | iscsi_rcv_nl_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1da177e4 | 1549 | { |
0896b752 AA |
1550 | struct netlink_notify *n = ptr; |
1551 | ||
1552 | if (event == NETLINK_URELEASE && | |
1553 | n->protocol == NETLINK_ISCSI && n->pid) { | |
7b8631b5 | 1554 | struct iscsi_cls_conn *conn; |
0896b752 AA |
1555 | unsigned long flags; |
1556 | ||
7b8631b5 | 1557 | mempool_zone_complete(z_reply); |
0896b752 AA |
1558 | spin_lock_irqsave(&connlock, flags); |
1559 | list_for_each_entry(conn, &connlist, conn_list) { | |
7b8631b5 MC |
1560 | mempool_zone_complete(conn->z_error); |
1561 | mempool_zone_complete(conn->z_pdu); | |
0896b752 AA |
1562 | } |
1563 | spin_unlock_irqrestore(&connlock, flags); | |
1564 | } | |
1da177e4 | 1565 | |
0896b752 | 1566 | return NOTIFY_DONE; |
1da177e4 LT |
1567 | } |
1568 | ||
0896b752 AA |
1569 | static struct notifier_block iscsi_nl_notifier = { |
1570 | .notifier_call = iscsi_rcv_nl_event, | |
1571 | }; | |
1da177e4 LT |
1572 | |
1573 | static __init int iscsi_transport_init(void) | |
1574 | { | |
0896b752 | 1575 | int err; |
1da177e4 | 1576 | |
0896b752 | 1577 | err = class_register(&iscsi_transport_class); |
1da177e4 LT |
1578 | if (err) |
1579 | return err; | |
0896b752 | 1580 | |
30a6c652 | 1581 | err = transport_class_register(&iscsi_host_class); |
0896b752 AA |
1582 | if (err) |
1583 | goto unregister_transport_class; | |
1584 | ||
30a6c652 MC |
1585 | err = transport_class_register(&iscsi_connection_class); |
1586 | if (err) | |
1587 | goto unregister_host_class; | |
1588 | ||
0896b752 AA |
1589 | err = transport_class_register(&iscsi_session_class); |
1590 | if (err) | |
1591 | goto unregister_conn_class; | |
1592 | ||
1593 | err = netlink_register_notifier(&iscsi_nl_notifier); | |
1594 | if (err) | |
1595 | goto unregister_session_class; | |
1596 | ||
2290d2b6 | 1597 | nls = netlink_kernel_create(NETLINK_ISCSI, 1, iscsi_if_rx, |
7b8631b5 | 1598 | THIS_MODULE); |
0896b752 AA |
1599 | if (!nls) { |
1600 | err = -ENOBUFS; | |
1601 | goto unregister_notifier; | |
1602 | } | |
1603 | ||
7b8631b5 | 1604 | z_reply = mempool_zone_init(Z_MAX_REPLY, |
0896b752 | 1605 | NLMSG_SPACE(sizeof(struct iscsi_uevent)), Z_HIWAT_REPLY); |
7b8631b5 | 1606 | if (z_reply) |
0896b752 AA |
1607 | return 0; |
1608 | ||
1609 | sock_release(nls->sk_socket); | |
1610 | unregister_notifier: | |
1611 | netlink_unregister_notifier(&iscsi_nl_notifier); | |
1612 | unregister_session_class: | |
1613 | transport_class_unregister(&iscsi_session_class); | |
1614 | unregister_conn_class: | |
1615 | transport_class_unregister(&iscsi_connection_class); | |
30a6c652 MC |
1616 | unregister_host_class: |
1617 | transport_class_unregister(&iscsi_host_class); | |
0896b752 AA |
1618 | unregister_transport_class: |
1619 | class_unregister(&iscsi_transport_class); | |
1620 | return err; | |
1da177e4 LT |
1621 | } |
1622 | ||
1623 | static void __exit iscsi_transport_exit(void) | |
1624 | { | |
7b8631b5 | 1625 | mempool_zone_destroy(z_reply); |
0896b752 AA |
1626 | sock_release(nls->sk_socket); |
1627 | netlink_unregister_notifier(&iscsi_nl_notifier); | |
1628 | transport_class_unregister(&iscsi_connection_class); | |
1629 | transport_class_unregister(&iscsi_session_class); | |
30a6c652 | 1630 | transport_class_unregister(&iscsi_host_class); |
0896b752 | 1631 | class_unregister(&iscsi_transport_class); |
1da177e4 LT |
1632 | } |
1633 | ||
1634 | module_init(iscsi_transport_init); | |
1635 | module_exit(iscsi_transport_exit); | |
1636 | ||
0896b752 AA |
1637 | MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, " |
1638 | "Dmitry Yusupov <dmitry_yus@yahoo.com>, " | |
1639 | "Alex Aizman <itn780@yahoo.com>"); | |
1640 | MODULE_DESCRIPTION("iSCSI Transport Interface"); | |
1da177e4 | 1641 | MODULE_LICENSE("GPL"); |