Commit | Line | Data |
---|---|---|
0896b752 | 1 | /* |
1da177e4 LT |
2 | * iSCSI transport class definitions |
3 | * | |
4 | * Copyright (C) IBM Corporation, 2004 | |
0896b752 AA |
5 | * Copyright (C) Mike Christie, 2004 - 2005 |
6 | * Copyright (C) Dmitry Yusupov, 2004 - 2005 | |
7 | * Copyright (C) Alex Aizman, 2004 - 2005 | |
1da177e4 LT |
8 | * |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to the Free Software | |
21 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
22 | */ | |
23 | #include <linux/module.h> | |
0b950672 | 24 | #include <linux/mutex.h> |
5a0e3ad6 | 25 | #include <linux/slab.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> |
c01be6dc | 33 | #include <scsi/scsi_cmnd.h> |
1da177e4 | 34 | |
3b2bef1f | 35 | #define ISCSI_SESSION_ATTRS 23 |
c238c3bb | 36 | #define ISCSI_CONN_ATTRS 13 |
d8196ed2 | 37 | #define ISCSI_HOST_ATTRS 4 |
d82ff9be | 38 | |
4c2133c8 | 39 | #define ISCSI_TRANSPORT_VERSION "2.0-870" |
1da177e4 | 40 | |
632248aa MC |
41 | static int dbg_session; |
42 | module_param_named(debug_session, dbg_session, int, | |
43 | S_IRUGO | S_IWUSR); | |
44 | MODULE_PARM_DESC(debug_session, | |
45 | "Turn on debugging for sessions in scsi_transport_iscsi " | |
46 | "module. Set to 1 to turn on, and zero to turn off. Default " | |
47 | "is off."); | |
48 | ||
49 | static int dbg_conn; | |
50 | module_param_named(debug_conn, dbg_conn, int, | |
51 | S_IRUGO | S_IWUSR); | |
52 | MODULE_PARM_DESC(debug_conn, | |
53 | "Turn on debugging for connections in scsi_transport_iscsi " | |
54 | "module. Set to 1 to turn on, and zero to turn off. Default " | |
55 | "is off."); | |
56 | ||
57 | #define ISCSI_DBG_TRANS_SESSION(_session, dbg_fmt, arg...) \ | |
58 | do { \ | |
59 | if (dbg_session) \ | |
60 | iscsi_cls_session_printk(KERN_INFO, _session, \ | |
61 | "%s: " dbg_fmt, \ | |
62 | __func__, ##arg); \ | |
63 | } while (0); | |
64 | ||
65 | #define ISCSI_DBG_TRANS_CONN(_conn, dbg_fmt, arg...) \ | |
66 | do { \ | |
67 | if (dbg_conn) \ | |
68 | iscsi_cls_conn_printk(KERN_INFO, _conn, \ | |
69 | "%s: " dbg_fmt, \ | |
70 | __func__, ##arg); \ | |
71 | } while (0); | |
72 | ||
1da177e4 LT |
73 | struct iscsi_internal { |
74 | struct scsi_transport_template t; | |
0896b752 AA |
75 | struct iscsi_transport *iscsi_transport; |
76 | struct list_head list; | |
ee959b00 | 77 | struct device dev; |
30a6c652 | 78 | |
ee959b00 | 79 | struct device_attribute *host_attrs[ISCSI_HOST_ATTRS + 1]; |
0896b752 | 80 | struct transport_container conn_cont; |
ee959b00 | 81 | struct device_attribute *conn_attrs[ISCSI_CONN_ATTRS + 1]; |
0896b752 | 82 | struct transport_container session_cont; |
ee959b00 | 83 | struct device_attribute *session_attrs[ISCSI_SESSION_ATTRS + 1]; |
1da177e4 LT |
84 | }; |
85 | ||
41be1444 | 86 | static atomic_t iscsi_session_nr; /* sysfs session id for next new session */ |
d8bf541e | 87 | static struct workqueue_struct *iscsi_eh_timer_workq; |
b5c7a12d | 88 | |
0896b752 AA |
89 | /* |
90 | * list of registered transports and lock that must | |
91 | * be held while accessing list. The iscsi_transport_lock must | |
0b950672 | 92 | * be acquired after the rx_queue_mutex. |
0896b752 AA |
93 | */ |
94 | static LIST_HEAD(iscsi_transports); | |
95 | static DEFINE_SPINLOCK(iscsi_transport_lock); | |
96 | ||
97 | #define to_iscsi_internal(tmpl) \ | |
98 | container_of(tmpl, struct iscsi_internal, t) | |
99 | ||
ee959b00 TJ |
100 | #define dev_to_iscsi_internal(_dev) \ |
101 | container_of(_dev, struct iscsi_internal, dev) | |
0896b752 | 102 | |
ee959b00 | 103 | static void iscsi_transport_release(struct device *dev) |
0896b752 | 104 | { |
ee959b00 | 105 | struct iscsi_internal *priv = dev_to_iscsi_internal(dev); |
0896b752 AA |
106 | kfree(priv); |
107 | } | |
1da177e4 | 108 | |
0896b752 AA |
109 | /* |
110 | * iscsi_transport_class represents the iscsi_transports that are | |
111 | * registered. | |
112 | */ | |
113 | static struct class iscsi_transport_class = { | |
114 | .name = "iscsi_transport", | |
ee959b00 | 115 | .dev_release = iscsi_transport_release, |
0896b752 AA |
116 | }; |
117 | ||
118 | static ssize_t | |
ee959b00 TJ |
119 | show_transport_handle(struct device *dev, struct device_attribute *attr, |
120 | char *buf) | |
0896b752 | 121 | { |
ee959b00 | 122 | struct iscsi_internal *priv = dev_to_iscsi_internal(dev); |
762e2bfa | 123 | return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport)); |
0896b752 | 124 | } |
ee959b00 | 125 | static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL); |
0896b752 AA |
126 | |
127 | #define show_transport_attr(name, format) \ | |
128 | static ssize_t \ | |
ee959b00 TJ |
129 | show_transport_##name(struct device *dev, \ |
130 | struct device_attribute *attr,char *buf) \ | |
0896b752 | 131 | { \ |
ee959b00 | 132 | struct iscsi_internal *priv = dev_to_iscsi_internal(dev); \ |
0896b752 AA |
133 | return sprintf(buf, format"\n", priv->iscsi_transport->name); \ |
134 | } \ | |
ee959b00 | 135 | static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL); |
0896b752 AA |
136 | |
137 | show_transport_attr(caps, "0x%x"); | |
0896b752 AA |
138 | |
139 | static struct attribute *iscsi_transport_attrs[] = { | |
ee959b00 TJ |
140 | &dev_attr_handle.attr, |
141 | &dev_attr_caps.attr, | |
0896b752 AA |
142 | NULL, |
143 | }; | |
144 | ||
145 | static struct attribute_group iscsi_transport_group = { | |
146 | .attrs = iscsi_transport_attrs, | |
147 | }; | |
148 | ||
d82ff9be MC |
149 | /* |
150 | * iSCSI endpoint attrs | |
151 | */ | |
152 | #define iscsi_dev_to_endpoint(_dev) \ | |
153 | container_of(_dev, struct iscsi_endpoint, dev) | |
154 | ||
155 | #define ISCSI_ATTR(_prefix,_name,_mode,_show,_store) \ | |
156 | struct device_attribute dev_attr_##_prefix##_##_name = \ | |
157 | __ATTR(_name,_mode,_show,_store) | |
158 | ||
159 | static void iscsi_endpoint_release(struct device *dev) | |
160 | { | |
161 | struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev); | |
162 | kfree(ep); | |
163 | } | |
164 | ||
165 | static struct class iscsi_endpoint_class = { | |
166 | .name = "iscsi_endpoint", | |
167 | .dev_release = iscsi_endpoint_release, | |
168 | }; | |
169 | ||
170 | static ssize_t | |
171 | show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf) | |
172 | { | |
173 | struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev); | |
21536062 | 174 | return sprintf(buf, "%llu\n", (unsigned long long) ep->id); |
d82ff9be MC |
175 | } |
176 | static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL); | |
177 | ||
178 | static struct attribute *iscsi_endpoint_attrs[] = { | |
179 | &dev_attr_ep_handle.attr, | |
180 | NULL, | |
181 | }; | |
182 | ||
183 | static struct attribute_group iscsi_endpoint_group = { | |
184 | .attrs = iscsi_endpoint_attrs, | |
185 | }; | |
186 | ||
187 | #define ISCSI_MAX_EPID -1 | |
188 | ||
189 | static int iscsi_match_epid(struct device *dev, void *data) | |
190 | { | |
191 | struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev); | |
21536062 | 192 | uint64_t *epid = (uint64_t *) data; |
d82ff9be MC |
193 | |
194 | return *epid == ep->id; | |
195 | } | |
196 | ||
197 | struct iscsi_endpoint * | |
198 | iscsi_create_endpoint(int dd_size) | |
199 | { | |
200 | struct device *dev; | |
201 | struct iscsi_endpoint *ep; | |
21536062 | 202 | uint64_t id; |
d82ff9be MC |
203 | int err; |
204 | ||
205 | for (id = 1; id < ISCSI_MAX_EPID; id++) { | |
695794ae | 206 | dev = class_find_device(&iscsi_endpoint_class, NULL, &id, |
d82ff9be MC |
207 | iscsi_match_epid); |
208 | if (!dev) | |
209 | break; | |
210 | } | |
211 | if (id == ISCSI_MAX_EPID) { | |
212 | printk(KERN_ERR "Too many connections. Max supported %u\n", | |
213 | ISCSI_MAX_EPID - 1); | |
214 | return NULL; | |
215 | } | |
216 | ||
217 | ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL); | |
218 | if (!ep) | |
219 | return NULL; | |
220 | ||
221 | ep->id = id; | |
222 | ep->dev.class = &iscsi_endpoint_class; | |
71610f55 | 223 | dev_set_name(&ep->dev, "ep-%llu", (unsigned long long) id); |
d82ff9be MC |
224 | err = device_register(&ep->dev); |
225 | if (err) | |
226 | goto free_ep; | |
227 | ||
228 | err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group); | |
229 | if (err) | |
230 | goto unregister_dev; | |
231 | ||
232 | if (dd_size) | |
233 | ep->dd_data = &ep[1]; | |
234 | return ep; | |
235 | ||
236 | unregister_dev: | |
237 | device_unregister(&ep->dev); | |
238 | return NULL; | |
239 | ||
240 | free_ep: | |
241 | kfree(ep); | |
242 | return NULL; | |
243 | } | |
244 | EXPORT_SYMBOL_GPL(iscsi_create_endpoint); | |
245 | ||
246 | void iscsi_destroy_endpoint(struct iscsi_endpoint *ep) | |
247 | { | |
248 | sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group); | |
249 | device_unregister(&ep->dev); | |
250 | } | |
251 | EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint); | |
252 | ||
253 | struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle) | |
254 | { | |
f80f868e | 255 | struct iscsi_endpoint *ep; |
d82ff9be MC |
256 | struct device *dev; |
257 | ||
695794ae | 258 | dev = class_find_device(&iscsi_endpoint_class, NULL, &handle, |
d82ff9be MC |
259 | iscsi_match_epid); |
260 | if (!dev) | |
261 | return NULL; | |
262 | ||
f80f868e MC |
263 | ep = iscsi_dev_to_endpoint(dev); |
264 | /* | |
265 | * we can drop this now because the interface will prevent | |
266 | * removals and lookups from racing. | |
267 | */ | |
268 | put_device(dev); | |
269 | return ep; | |
d82ff9be MC |
270 | } |
271 | EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint); | |
272 | ||
30a6c652 | 273 | static int iscsi_setup_host(struct transport_container *tc, struct device *dev, |
ee959b00 | 274 | struct device *cdev) |
30a6c652 MC |
275 | { |
276 | struct Scsi_Host *shost = dev_to_shost(dev); | |
32c6e1b9 | 277 | struct iscsi_cls_host *ihost = shost->shost_data; |
30a6c652 MC |
278 | |
279 | memset(ihost, 0, sizeof(*ihost)); | |
8aae18ad | 280 | atomic_set(&ihost->nr_scans, 0); |
7970634b | 281 | mutex_init(&ihost->mutex); |
30a6c652 MC |
282 | return 0; |
283 | } | |
284 | ||
285 | static DECLARE_TRANSPORT_CLASS(iscsi_host_class, | |
286 | "iscsi_host", | |
287 | iscsi_setup_host, | |
06d25af4 | 288 | NULL, |
30a6c652 MC |
289 | NULL); |
290 | ||
0896b752 AA |
291 | static DECLARE_TRANSPORT_CLASS(iscsi_session_class, |
292 | "iscsi_session", | |
1da177e4 LT |
293 | NULL, |
294 | NULL, | |
295 | NULL); | |
296 | ||
0896b752 AA |
297 | static DECLARE_TRANSPORT_CLASS(iscsi_connection_class, |
298 | "iscsi_connection", | |
1da177e4 LT |
299 | NULL, |
300 | NULL, | |
301 | NULL); | |
0896b752 AA |
302 | |
303 | static struct sock *nls; | |
0b950672 | 304 | static DEFINE_MUTEX(rx_queue_mutex); |
0896b752 | 305 | |
7b7232f3 MC |
306 | static LIST_HEAD(sesslist); |
307 | static DEFINE_SPINLOCK(sesslock); | |
7b8631b5 MC |
308 | static LIST_HEAD(connlist); |
309 | static DEFINE_SPINLOCK(connlock); | |
0896b752 | 310 | |
b5c7a12d MC |
311 | static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn) |
312 | { | |
313 | struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent); | |
314 | return sess->sid; | |
315 | } | |
316 | ||
317 | /* | |
318 | * Returns the matching session to a given sid | |
319 | */ | |
320 | static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid) | |
7b7232f3 MC |
321 | { |
322 | unsigned long flags; | |
323 | struct iscsi_cls_session *sess; | |
324 | ||
325 | spin_lock_irqsave(&sesslock, flags); | |
326 | list_for_each_entry(sess, &sesslist, sess_list) { | |
b5c7a12d | 327 | if (sess->sid == sid) { |
7b7232f3 MC |
328 | spin_unlock_irqrestore(&sesslock, flags); |
329 | return sess; | |
330 | } | |
331 | } | |
332 | spin_unlock_irqrestore(&sesslock, flags); | |
333 | return NULL; | |
334 | } | |
335 | ||
b5c7a12d MC |
336 | /* |
337 | * Returns the matching connection to a given sid / cid tuple | |
338 | */ | |
339 | static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid) | |
7b7232f3 MC |
340 | { |
341 | unsigned long flags; | |
342 | struct iscsi_cls_conn *conn; | |
343 | ||
344 | spin_lock_irqsave(&connlock, flags); | |
345 | list_for_each_entry(conn, &connlist, conn_list) { | |
b5c7a12d | 346 | if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) { |
7b7232f3 MC |
347 | spin_unlock_irqrestore(&connlock, flags); |
348 | return conn; | |
349 | } | |
350 | } | |
351 | spin_unlock_irqrestore(&connlock, flags); | |
352 | return NULL; | |
353 | } | |
354 | ||
7b8631b5 MC |
355 | /* |
356 | * The following functions can be used by LLDs that allocate | |
357 | * their own scsi_hosts or by software iscsi LLDs | |
358 | */ | |
6eabafbe MC |
359 | static struct { |
360 | int value; | |
361 | char *name; | |
362 | } iscsi_session_state_names[] = { | |
363 | { ISCSI_SESSION_LOGGED_IN, "LOGGED_IN" }, | |
364 | { ISCSI_SESSION_FAILED, "FAILED" }, | |
365 | { ISCSI_SESSION_FREE, "FREE" }, | |
366 | }; | |
367 | ||
3b0f208a | 368 | static const char *iscsi_session_state_name(int state) |
6eabafbe MC |
369 | { |
370 | int i; | |
371 | char *name = NULL; | |
372 | ||
373 | for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) { | |
374 | if (iscsi_session_state_names[i].value == state) { | |
375 | name = iscsi_session_state_names[i].name; | |
376 | break; | |
377 | } | |
378 | } | |
379 | return name; | |
380 | } | |
381 | ||
382 | int iscsi_session_chkready(struct iscsi_cls_session *session) | |
383 | { | |
384 | unsigned long flags; | |
385 | int err; | |
386 | ||
387 | spin_lock_irqsave(&session->lock, flags); | |
388 | switch (session->state) { | |
389 | case ISCSI_SESSION_LOGGED_IN: | |
390 | err = 0; | |
391 | break; | |
392 | case ISCSI_SESSION_FAILED: | |
9a1a69a1 | 393 | err = DID_IMM_RETRY << 16; |
6eabafbe MC |
394 | break; |
395 | case ISCSI_SESSION_FREE: | |
56d7fcfa | 396 | err = DID_TRANSPORT_FAILFAST << 16; |
6eabafbe MC |
397 | break; |
398 | default: | |
399 | err = DID_NO_CONNECT << 16; | |
400 | break; | |
401 | } | |
402 | spin_unlock_irqrestore(&session->lock, flags); | |
403 | return err; | |
404 | } | |
405 | EXPORT_SYMBOL_GPL(iscsi_session_chkready); | |
406 | ||
7b8631b5 MC |
407 | static void iscsi_session_release(struct device *dev) |
408 | { | |
409 | struct iscsi_cls_session *session = iscsi_dev_to_session(dev); | |
7b8631b5 | 410 | struct Scsi_Host *shost; |
0896b752 | 411 | |
7b8631b5 MC |
412 | shost = iscsi_session_to_shost(session); |
413 | scsi_host_put(shost); | |
632248aa | 414 | ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n"); |
7b8631b5 | 415 | kfree(session); |
7b8631b5 | 416 | } |
0896b752 | 417 | |
7b8631b5 MC |
418 | static int iscsi_is_session_dev(const struct device *dev) |
419 | { | |
420 | return dev->release == iscsi_session_release; | |
421 | } | |
0896b752 | 422 | |
a4804cd6 MC |
423 | static int iscsi_iter_session_fn(struct device *dev, void *data) |
424 | { | |
425 | void (* fn) (struct iscsi_cls_session *) = data; | |
426 | ||
427 | if (!iscsi_is_session_dev(dev)) | |
428 | return 0; | |
429 | fn(iscsi_dev_to_session(dev)); | |
430 | return 0; | |
431 | } | |
432 | ||
433 | void iscsi_host_for_each_session(struct Scsi_Host *shost, | |
434 | void (*fn)(struct iscsi_cls_session *)) | |
435 | { | |
436 | device_for_each_child(&shost->shost_gendev, fn, | |
437 | iscsi_iter_session_fn); | |
438 | } | |
439 | EXPORT_SYMBOL_GPL(iscsi_host_for_each_session); | |
440 | ||
8aae18ad MC |
441 | /** |
442 | * iscsi_scan_finished - helper to report when running scans are done | |
443 | * @shost: scsi host | |
444 | * @time: scan run time | |
445 | * | |
446 | * This function can be used by drives like qla4xxx to report to the scsi | |
447 | * layer when the scans it kicked off at module load time are done. | |
448 | */ | |
449 | int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time) | |
450 | { | |
32c6e1b9 | 451 | struct iscsi_cls_host *ihost = shost->shost_data; |
8aae18ad MC |
452 | /* |
453 | * qla4xxx will have kicked off some session unblocks before calling | |
454 | * scsi_scan_host, so just wait for them to complete. | |
455 | */ | |
456 | return !atomic_read(&ihost->nr_scans); | |
457 | } | |
458 | EXPORT_SYMBOL_GPL(iscsi_scan_finished); | |
459 | ||
7970634b MC |
460 | struct iscsi_scan_data { |
461 | unsigned int channel; | |
462 | unsigned int id; | |
463 | unsigned int lun; | |
464 | }; | |
465 | ||
466 | static int iscsi_user_scan_session(struct device *dev, void *data) | |
30a6c652 | 467 | { |
7970634b | 468 | struct iscsi_scan_data *scan_data = data; |
30a6c652 | 469 | struct iscsi_cls_session *session; |
7970634b MC |
470 | struct Scsi_Host *shost; |
471 | struct iscsi_cls_host *ihost; | |
472 | unsigned long flags; | |
473 | unsigned int id; | |
474 | ||
475 | if (!iscsi_is_session_dev(dev)) | |
476 | return 0; | |
477 | ||
478 | session = iscsi_dev_to_session(dev); | |
632248aa MC |
479 | |
480 | ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n"); | |
481 | ||
7970634b MC |
482 | shost = iscsi_session_to_shost(session); |
483 | ihost = shost->shost_data; | |
30a6c652 MC |
484 | |
485 | mutex_lock(&ihost->mutex); | |
7970634b MC |
486 | spin_lock_irqsave(&session->lock, flags); |
487 | if (session->state != ISCSI_SESSION_LOGGED_IN) { | |
488 | spin_unlock_irqrestore(&session->lock, flags); | |
632248aa | 489 | goto user_scan_exit; |
30a6c652 | 490 | } |
7970634b MC |
491 | id = session->target_id; |
492 | spin_unlock_irqrestore(&session->lock, flags); | |
30a6c652 | 493 | |
7970634b MC |
494 | if (id != ISCSI_MAX_TARGET) { |
495 | if ((scan_data->channel == SCAN_WILD_CARD || | |
496 | scan_data->channel == 0) && | |
497 | (scan_data->id == SCAN_WILD_CARD || | |
498 | scan_data->id == id)) | |
499 | scsi_scan_target(&session->dev, 0, id, | |
500 | scan_data->lun, 1); | |
501 | } | |
632248aa MC |
502 | |
503 | user_scan_exit: | |
7970634b | 504 | mutex_unlock(&ihost->mutex); |
632248aa | 505 | ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n"); |
30a6c652 MC |
506 | return 0; |
507 | } | |
508 | ||
7970634b MC |
509 | static int iscsi_user_scan(struct Scsi_Host *shost, uint channel, |
510 | uint id, uint lun) | |
511 | { | |
512 | struct iscsi_scan_data scan_data; | |
513 | ||
514 | scan_data.channel = channel; | |
515 | scan_data.id = id; | |
516 | scan_data.lun = lun; | |
517 | ||
518 | return device_for_each_child(&shost->shost_gendev, &scan_data, | |
519 | iscsi_user_scan_session); | |
520 | } | |
521 | ||
bd976f62 MC |
522 | static void iscsi_scan_session(struct work_struct *work) |
523 | { | |
524 | struct iscsi_cls_session *session = | |
525 | container_of(work, struct iscsi_cls_session, scan_work); | |
8aae18ad | 526 | struct Scsi_Host *shost = iscsi_session_to_shost(session); |
32c6e1b9 | 527 | struct iscsi_cls_host *ihost = shost->shost_data; |
7970634b | 528 | struct iscsi_scan_data scan_data; |
bd976f62 | 529 | |
7970634b MC |
530 | scan_data.channel = 0; |
531 | scan_data.id = SCAN_WILD_CARD; | |
532 | scan_data.lun = SCAN_WILD_CARD; | |
bd976f62 | 533 | |
7970634b | 534 | iscsi_user_scan_session(&session->dev, &scan_data); |
8aae18ad | 535 | atomic_dec(&ihost->nr_scans); |
bd976f62 MC |
536 | } |
537 | ||
c01be6dc MC |
538 | /** |
539 | * iscsi_block_scsi_eh - block scsi eh until session state has transistioned | |
e6d4ef45 | 540 | * @cmd: scsi cmd passed to scsi eh handler |
c01be6dc MC |
541 | * |
542 | * If the session is down this function will wait for the recovery | |
543 | * timer to fire or for the session to be logged back in. If the | |
544 | * recovery timer fires then FAST_IO_FAIL is returned. The caller | |
545 | * should pass this error value to the scsi eh. | |
546 | */ | |
547 | int iscsi_block_scsi_eh(struct scsi_cmnd *cmd) | |
548 | { | |
549 | struct iscsi_cls_session *session = | |
550 | starget_to_session(scsi_target(cmd->device)); | |
551 | unsigned long flags; | |
552 | int ret = 0; | |
553 | ||
554 | spin_lock_irqsave(&session->lock, flags); | |
555 | while (session->state != ISCSI_SESSION_LOGGED_IN) { | |
556 | if (session->state == ISCSI_SESSION_FREE) { | |
557 | ret = FAST_IO_FAIL; | |
558 | break; | |
559 | } | |
560 | spin_unlock_irqrestore(&session->lock, flags); | |
561 | msleep(1000); | |
562 | spin_lock_irqsave(&session->lock, flags); | |
563 | } | |
564 | spin_unlock_irqrestore(&session->lock, flags); | |
565 | return ret; | |
566 | } | |
567 | EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh); | |
568 | ||
c4028958 | 569 | static void session_recovery_timedout(struct work_struct *work) |
30a6c652 | 570 | { |
c4028958 DH |
571 | struct iscsi_cls_session *session = |
572 | container_of(work, struct iscsi_cls_session, | |
573 | recovery_work.work); | |
6eabafbe | 574 | unsigned long flags; |
30a6c652 | 575 | |
322d739d MC |
576 | iscsi_cls_session_printk(KERN_INFO, session, |
577 | "session recovery timed out after %d secs\n", | |
578 | session->recovery_tmo); | |
30a6c652 | 579 | |
6eabafbe MC |
580 | spin_lock_irqsave(&session->lock, flags); |
581 | switch (session->state) { | |
582 | case ISCSI_SESSION_FAILED: | |
583 | session->state = ISCSI_SESSION_FREE; | |
584 | break; | |
585 | case ISCSI_SESSION_LOGGED_IN: | |
586 | case ISCSI_SESSION_FREE: | |
587 | /* we raced with the unblock's flush */ | |
588 | spin_unlock_irqrestore(&session->lock, flags); | |
589 | return; | |
590 | } | |
591 | spin_unlock_irqrestore(&session->lock, flags); | |
592 | ||
30a6c652 MC |
593 | if (session->transport->session_recovery_timedout) |
594 | session->transport->session_recovery_timedout(session); | |
595 | ||
632248aa | 596 | ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n"); |
30a6c652 | 597 | scsi_target_unblock(&session->dev); |
632248aa | 598 | ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n"); |
30a6c652 MC |
599 | } |
600 | ||
45ab33b6 | 601 | static void __iscsi_unblock_session(struct work_struct *work) |
6eabafbe | 602 | { |
45ab33b6 MC |
603 | struct iscsi_cls_session *session = |
604 | container_of(work, struct iscsi_cls_session, | |
605 | unblock_work); | |
bd976f62 | 606 | struct Scsi_Host *shost = iscsi_session_to_shost(session); |
32c6e1b9 | 607 | struct iscsi_cls_host *ihost = shost->shost_data; |
6eabafbe MC |
608 | unsigned long flags; |
609 | ||
632248aa | 610 | ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n"); |
45ab33b6 MC |
611 | /* |
612 | * The recovery and unblock work get run from the same workqueue, | |
613 | * so try to cancel it if it was going to run after this unblock. | |
614 | */ | |
615 | cancel_delayed_work(&session->recovery_work); | |
6eabafbe MC |
616 | spin_lock_irqsave(&session->lock, flags); |
617 | session->state = ISCSI_SESSION_LOGGED_IN; | |
618 | spin_unlock_irqrestore(&session->lock, flags); | |
45ab33b6 MC |
619 | /* start IO */ |
620 | scsi_target_unblock(&session->dev); | |
8aae18ad MC |
621 | /* |
622 | * Only do kernel scanning if the driver is properly hooked into | |
623 | * the async scanning code (drivers like iscsi_tcp do login and | |
624 | * scanning from userspace). | |
625 | */ | |
626 | if (shost->hostt->scan_finished) { | |
06d25af4 | 627 | if (scsi_queue_work(shost, &session->scan_work)) |
8aae18ad MC |
628 | atomic_inc(&ihost->nr_scans); |
629 | } | |
632248aa | 630 | ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n"); |
6eabafbe | 631 | } |
45ab33b6 MC |
632 | |
633 | /** | |
634 | * iscsi_unblock_session - set a session as logged in and start IO. | |
635 | * @session: iscsi session | |
636 | * | |
637 | * Mark a session as ready to accept IO. | |
638 | */ | |
639 | void iscsi_unblock_session(struct iscsi_cls_session *session) | |
640 | { | |
641 | queue_work(iscsi_eh_timer_workq, &session->unblock_work); | |
642 | /* | |
643 | * make sure all the events have completed before tell the driver | |
644 | * it is safe | |
645 | */ | |
646 | flush_workqueue(iscsi_eh_timer_workq); | |
647 | } | |
30a6c652 MC |
648 | EXPORT_SYMBOL_GPL(iscsi_unblock_session); |
649 | ||
45ab33b6 | 650 | static void __iscsi_block_session(struct work_struct *work) |
30a6c652 | 651 | { |
45ab33b6 MC |
652 | struct iscsi_cls_session *session = |
653 | container_of(work, struct iscsi_cls_session, | |
654 | block_work); | |
6eabafbe MC |
655 | unsigned long flags; |
656 | ||
632248aa | 657 | ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n"); |
6eabafbe MC |
658 | spin_lock_irqsave(&session->lock, flags); |
659 | session->state = ISCSI_SESSION_FAILED; | |
660 | spin_unlock_irqrestore(&session->lock, flags); | |
30a6c652 | 661 | scsi_target_block(&session->dev); |
632248aa | 662 | ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n"); |
fdd46dcb MC |
663 | if (session->recovery_tmo >= 0) |
664 | queue_delayed_work(iscsi_eh_timer_workq, | |
665 | &session->recovery_work, | |
666 | session->recovery_tmo * HZ); | |
30a6c652 | 667 | } |
45ab33b6 MC |
668 | |
669 | void iscsi_block_session(struct iscsi_cls_session *session) | |
670 | { | |
671 | queue_work(iscsi_eh_timer_workq, &session->block_work); | |
672 | } | |
30a6c652 MC |
673 | EXPORT_SYMBOL_GPL(iscsi_block_session); |
674 | ||
26974789 MC |
675 | static void __iscsi_unbind_session(struct work_struct *work) |
676 | { | |
677 | struct iscsi_cls_session *session = | |
678 | container_of(work, struct iscsi_cls_session, | |
679 | unbind_work); | |
680 | struct Scsi_Host *shost = iscsi_session_to_shost(session); | |
32c6e1b9 | 681 | struct iscsi_cls_host *ihost = shost->shost_data; |
7970634b | 682 | unsigned long flags; |
26974789 | 683 | |
632248aa MC |
684 | ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n"); |
685 | ||
26974789 MC |
686 | /* Prevent new scans and make sure scanning is not in progress */ |
687 | mutex_lock(&ihost->mutex); | |
7970634b MC |
688 | spin_lock_irqsave(&session->lock, flags); |
689 | if (session->target_id == ISCSI_MAX_TARGET) { | |
690 | spin_unlock_irqrestore(&session->lock, flags); | |
26974789 MC |
691 | mutex_unlock(&ihost->mutex); |
692 | return; | |
693 | } | |
7970634b MC |
694 | session->target_id = ISCSI_MAX_TARGET; |
695 | spin_unlock_irqrestore(&session->lock, flags); | |
26974789 MC |
696 | mutex_unlock(&ihost->mutex); |
697 | ||
698 | scsi_remove_target(&session->dev); | |
699 | iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION); | |
632248aa | 700 | ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n"); |
26974789 MC |
701 | } |
702 | ||
7b8631b5 | 703 | struct iscsi_cls_session * |
5d91e209 MC |
704 | iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport, |
705 | int dd_size) | |
7b8631b5 MC |
706 | { |
707 | struct iscsi_cls_session *session; | |
7b8631b5 | 708 | |
5d91e209 | 709 | session = kzalloc(sizeof(*session) + dd_size, |
b5c7a12d | 710 | GFP_KERNEL); |
7b8631b5 | 711 | if (!session) |
f53a88da MC |
712 | return NULL; |
713 | ||
7b8631b5 | 714 | session->transport = transport; |
30a6c652 | 715 | session->recovery_tmo = 120; |
6eabafbe | 716 | session->state = ISCSI_SESSION_FREE; |
c4028958 | 717 | INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout); |
30a6c652 | 718 | INIT_LIST_HEAD(&session->sess_list); |
45ab33b6 MC |
719 | INIT_WORK(&session->unblock_work, __iscsi_unblock_session); |
720 | INIT_WORK(&session->block_work, __iscsi_block_session); | |
26974789 | 721 | INIT_WORK(&session->unbind_work, __iscsi_unbind_session); |
bd976f62 | 722 | INIT_WORK(&session->scan_work, iscsi_scan_session); |
6eabafbe | 723 | spin_lock_init(&session->lock); |
7b8631b5 | 724 | |
6a8a0d36 MC |
725 | /* this is released in the dev's release function */ |
726 | scsi_host_get(shost); | |
8434aa8b MC |
727 | session->dev.parent = &shost->shost_gendev; |
728 | session->dev.release = iscsi_session_release; | |
729 | device_initialize(&session->dev); | |
5d91e209 | 730 | if (dd_size) |
b5c7a12d | 731 | session->dd_data = &session[1]; |
632248aa MC |
732 | |
733 | ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n"); | |
8434aa8b MC |
734 | return session; |
735 | } | |
736 | EXPORT_SYMBOL_GPL(iscsi_alloc_session); | |
737 | ||
7970634b MC |
738 | static int iscsi_get_next_target_id(struct device *dev, void *data) |
739 | { | |
740 | struct iscsi_cls_session *session; | |
741 | unsigned long flags; | |
742 | int err = 0; | |
743 | ||
744 | if (!iscsi_is_session_dev(dev)) | |
745 | return 0; | |
746 | ||
747 | session = iscsi_dev_to_session(dev); | |
748 | spin_lock_irqsave(&session->lock, flags); | |
749 | if (*((unsigned int *) data) == session->target_id) | |
750 | err = -EEXIST; | |
751 | spin_unlock_irqrestore(&session->lock, flags); | |
752 | return err; | |
753 | } | |
754 | ||
6a8a0d36 | 755 | int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id) |
8434aa8b MC |
756 | { |
757 | struct Scsi_Host *shost = iscsi_session_to_shost(session); | |
32c6e1b9 | 758 | struct iscsi_cls_host *ihost; |
26974789 | 759 | unsigned long flags; |
7970634b | 760 | unsigned int id = target_id; |
8434aa8b | 761 | int err; |
b5c7a12d | 762 | |
30a6c652 | 763 | ihost = shost->shost_data; |
41be1444 | 764 | session->sid = atomic_add_return(1, &iscsi_session_nr); |
7970634b MC |
765 | |
766 | if (id == ISCSI_MAX_TARGET) { | |
767 | for (id = 0; id < ISCSI_MAX_TARGET; id++) { | |
768 | err = device_for_each_child(&shost->shost_gendev, &id, | |
769 | iscsi_get_next_target_id); | |
770 | if (!err) | |
771 | break; | |
772 | } | |
773 | ||
774 | if (id == ISCSI_MAX_TARGET) { | |
775 | iscsi_cls_session_printk(KERN_ERR, session, | |
776 | "Too many iscsi targets. Max " | |
777 | "number of targets is %d.\n", | |
778 | ISCSI_MAX_TARGET - 1); | |
24add1c4 | 779 | err = -EOVERFLOW; |
7970634b MC |
780 | goto release_host; |
781 | } | |
782 | } | |
783 | session->target_id = id; | |
30a6c652 | 784 | |
71610f55 | 785 | dev_set_name(&session->dev, "session%u", session->sid); |
8434aa8b | 786 | err = device_add(&session->dev); |
7b8631b5 | 787 | if (err) { |
322d739d MC |
788 | iscsi_cls_session_printk(KERN_ERR, session, |
789 | "could not register session's dev\n"); | |
8434aa8b | 790 | goto release_host; |
7b8631b5 MC |
791 | } |
792 | transport_register_device(&session->dev); | |
793 | ||
26974789 MC |
794 | spin_lock_irqsave(&sesslock, flags); |
795 | list_add(&session->sess_list, &sesslist); | |
796 | spin_unlock_irqrestore(&sesslock, flags); | |
797 | ||
26974789 | 798 | iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION); |
632248aa | 799 | ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n"); |
8434aa8b | 800 | return 0; |
30a6c652 | 801 | |
8434aa8b MC |
802 | release_host: |
803 | scsi_host_put(shost); | |
804 | return err; | |
7b8631b5 | 805 | } |
8434aa8b | 806 | EXPORT_SYMBOL_GPL(iscsi_add_session); |
7b8631b5 MC |
807 | |
808 | /** | |
8434aa8b MC |
809 | * iscsi_create_session - create iscsi class session |
810 | * @shost: scsi host | |
811 | * @transport: iscsi transport | |
5d91e209 | 812 | * @dd_size: private driver data size |
eb44820c | 813 | * @target_id: which target |
7b8631b5 | 814 | * |
8434aa8b | 815 | * This can be called from a LLD or iscsi_transport. |
eb44820c | 816 | */ |
8434aa8b | 817 | struct iscsi_cls_session * |
5d91e209 MC |
818 | iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport, |
819 | int dd_size, unsigned int target_id) | |
8434aa8b MC |
820 | { |
821 | struct iscsi_cls_session *session; | |
822 | ||
5d91e209 | 823 | session = iscsi_alloc_session(shost, transport, dd_size); |
8434aa8b MC |
824 | if (!session) |
825 | return NULL; | |
826 | ||
6a8a0d36 | 827 | if (iscsi_add_session(session, target_id)) { |
8434aa8b MC |
828 | iscsi_free_session(session); |
829 | return NULL; | |
830 | } | |
831 | return session; | |
832 | } | |
833 | EXPORT_SYMBOL_GPL(iscsi_create_session); | |
834 | ||
26974789 MC |
835 | static void iscsi_conn_release(struct device *dev) |
836 | { | |
837 | struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev); | |
838 | struct device *parent = conn->dev.parent; | |
839 | ||
632248aa | 840 | ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n"); |
26974789 MC |
841 | kfree(conn); |
842 | put_device(parent); | |
843 | } | |
844 | ||
845 | static int iscsi_is_conn_dev(const struct device *dev) | |
846 | { | |
847 | return dev->release == iscsi_conn_release; | |
848 | } | |
849 | ||
850 | static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data) | |
851 | { | |
852 | if (!iscsi_is_conn_dev(dev)) | |
853 | return 0; | |
854 | return iscsi_destroy_conn(iscsi_dev_to_conn(dev)); | |
855 | } | |
856 | ||
8434aa8b | 857 | void iscsi_remove_session(struct iscsi_cls_session *session) |
7b8631b5 | 858 | { |
30a6c652 | 859 | struct Scsi_Host *shost = iscsi_session_to_shost(session); |
26974789 MC |
860 | unsigned long flags; |
861 | int err; | |
862 | ||
632248aa MC |
863 | ISCSI_DBG_TRANS_SESSION(session, "Removing session\n"); |
864 | ||
26974789 MC |
865 | spin_lock_irqsave(&sesslock, flags); |
866 | list_del(&session->sess_list); | |
867 | spin_unlock_irqrestore(&sesslock, flags); | |
30a6c652 | 868 | |
45ab33b6 MC |
869 | /* make sure there are no blocks/unblocks queued */ |
870 | flush_workqueue(iscsi_eh_timer_workq); | |
871 | /* make sure the timedout callout is not running */ | |
872 | if (!cancel_delayed_work(&session->recovery_work)) | |
873 | flush_workqueue(iscsi_eh_timer_workq); | |
26974789 MC |
874 | /* |
875 | * If we are blocked let commands flow again. The lld or iscsi | |
876 | * layer should set up the queuecommand to fail commands. | |
45ab33b6 MC |
877 | * We assume that LLD will not be calling block/unblock while |
878 | * removing the session. | |
26974789 | 879 | */ |
6eabafbe MC |
880 | spin_lock_irqsave(&session->lock, flags); |
881 | session->state = ISCSI_SESSION_FREE; | |
882 | spin_unlock_irqrestore(&session->lock, flags); | |
bd976f62 | 883 | |
45ab33b6 MC |
884 | scsi_target_unblock(&session->dev); |
885 | /* flush running scans then delete devices */ | |
06d25af4 | 886 | scsi_flush_work(shost); |
45ab33b6 | 887 | __iscsi_unbind_session(&session->unbind_work); |
30a6c652 | 888 | |
26974789 MC |
889 | /* hw iscsi may not have removed all connections from session */ |
890 | err = device_for_each_child(&session->dev, NULL, | |
891 | iscsi_iter_destroy_conn_fn); | |
892 | if (err) | |
322d739d MC |
893 | iscsi_cls_session_printk(KERN_ERR, session, |
894 | "Could not delete all connections " | |
895 | "for session. Error %d.\n", err); | |
8434aa8b | 896 | |
7b8631b5 | 897 | transport_unregister_device(&session->dev); |
632248aa MC |
898 | |
899 | ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n"); | |
8434aa8b MC |
900 | device_del(&session->dev); |
901 | } | |
902 | EXPORT_SYMBOL_GPL(iscsi_remove_session); | |
903 | ||
904 | void iscsi_free_session(struct iscsi_cls_session *session) | |
905 | { | |
632248aa | 906 | ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n"); |
26974789 | 907 | iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION); |
8434aa8b | 908 | put_device(&session->dev); |
7b8631b5 | 909 | } |
8434aa8b MC |
910 | EXPORT_SYMBOL_GPL(iscsi_free_session); |
911 | ||
912 | /** | |
913 | * iscsi_destroy_session - destroy iscsi session | |
914 | * @session: iscsi_session | |
915 | * | |
916 | * Can be called by a LLD or iscsi_transport. There must not be | |
917 | * any running connections. | |
eb44820c | 918 | */ |
8434aa8b MC |
919 | int iscsi_destroy_session(struct iscsi_cls_session *session) |
920 | { | |
921 | iscsi_remove_session(session); | |
632248aa | 922 | ISCSI_DBG_TRANS_SESSION(session, "Completing session destruction\n"); |
8434aa8b MC |
923 | iscsi_free_session(session); |
924 | return 0; | |
925 | } | |
7b8631b5 MC |
926 | EXPORT_SYMBOL_GPL(iscsi_destroy_session); |
927 | ||
7b8631b5 MC |
928 | /** |
929 | * iscsi_create_conn - create iscsi class connection | |
930 | * @session: iscsi cls session | |
5d91e209 | 931 | * @dd_size: private driver data size |
7b8631b5 MC |
932 | * @cid: connection id |
933 | * | |
934 | * This can be called from a LLD or iscsi_transport. The connection | |
935 | * is child of the session so cid must be unique for all connections | |
936 | * on the session. | |
b5c7a12d MC |
937 | * |
938 | * Since we do not support MCS, cid will normally be zero. In some cases | |
939 | * for software iscsi we could be trying to preallocate a connection struct | |
940 | * in which case there could be two connection structs and cid would be | |
941 | * non-zero. | |
eb44820c | 942 | */ |
7b8631b5 | 943 | struct iscsi_cls_conn * |
5d91e209 | 944 | iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid) |
7b8631b5 MC |
945 | { |
946 | struct iscsi_transport *transport = session->transport; | |
7b8631b5 | 947 | struct iscsi_cls_conn *conn; |
26974789 | 948 | unsigned long flags; |
7b8631b5 MC |
949 | int err; |
950 | ||
5d91e209 | 951 | conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL); |
7b8631b5 MC |
952 | if (!conn) |
953 | return NULL; | |
5d91e209 | 954 | if (dd_size) |
7b8631b5 MC |
955 | conn->dd_data = &conn[1]; |
956 | ||
957 | INIT_LIST_HEAD(&conn->conn_list); | |
958 | conn->transport = transport; | |
b5c7a12d | 959 | conn->cid = cid; |
7b8631b5 MC |
960 | |
961 | /* this is released in the dev's release function */ | |
962 | if (!get_device(&session->dev)) | |
43a145a3 | 963 | goto free_conn; |
b5c7a12d | 964 | |
71610f55 | 965 | dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid); |
7b8631b5 MC |
966 | conn->dev.parent = &session->dev; |
967 | conn->dev.release = iscsi_conn_release; | |
968 | err = device_register(&conn->dev); | |
969 | if (err) { | |
322d739d MC |
970 | iscsi_cls_session_printk(KERN_ERR, session, "could not " |
971 | "register connection's dev\n"); | |
7b8631b5 MC |
972 | goto release_parent_ref; |
973 | } | |
974 | transport_register_device(&conn->dev); | |
26974789 MC |
975 | |
976 | spin_lock_irqsave(&connlock, flags); | |
977 | list_add(&conn->conn_list, &connlist); | |
978 | conn->active = 1; | |
979 | spin_unlock_irqrestore(&connlock, flags); | |
632248aa MC |
980 | |
981 | ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n"); | |
7b8631b5 MC |
982 | return conn; |
983 | ||
984 | release_parent_ref: | |
985 | put_device(&session->dev); | |
986 | free_conn: | |
987 | kfree(conn); | |
988 | return NULL; | |
989 | } | |
990 | ||
991 | EXPORT_SYMBOL_GPL(iscsi_create_conn); | |
992 | ||
993 | /** | |
994 | * iscsi_destroy_conn - destroy iscsi class connection | |
eb44820c | 995 | * @conn: iscsi cls session |
7b8631b5 | 996 | * |
26974789 | 997 | * This can be called from a LLD or iscsi_transport. |
eb44820c | 998 | */ |
7b8631b5 MC |
999 | int iscsi_destroy_conn(struct iscsi_cls_conn *conn) |
1000 | { | |
26974789 MC |
1001 | unsigned long flags; |
1002 | ||
1003 | spin_lock_irqsave(&connlock, flags); | |
1004 | conn->active = 0; | |
1005 | list_del(&conn->conn_list); | |
1006 | spin_unlock_irqrestore(&connlock, flags); | |
1007 | ||
7b8631b5 | 1008 | transport_unregister_device(&conn->dev); |
632248aa | 1009 | ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n"); |
7b8631b5 MC |
1010 | device_unregister(&conn->dev); |
1011 | return 0; | |
1012 | } | |
7b8631b5 MC |
1013 | EXPORT_SYMBOL_GPL(iscsi_destroy_conn); |
1014 | ||
7b8631b5 MC |
1015 | /* |
1016 | * iscsi interface functions | |
1017 | */ | |
0896b752 AA |
1018 | static struct iscsi_internal * |
1019 | iscsi_if_transport_lookup(struct iscsi_transport *tt) | |
1020 | { | |
1021 | struct iscsi_internal *priv; | |
1022 | unsigned long flags; | |
1023 | ||
1024 | spin_lock_irqsave(&iscsi_transport_lock, flags); | |
1025 | list_for_each_entry(priv, &iscsi_transports, list) { | |
1026 | if (tt == priv->iscsi_transport) { | |
1027 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
1028 | return priv; | |
1029 | } | |
1030 | } | |
1031 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
1032 | return NULL; | |
1033 | } | |
1da177e4 | 1034 | |
53cb8a1f | 1035 | static int |
43514774 | 1036 | iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp) |
53cb8a1f | 1037 | { |
43514774 | 1038 | return nlmsg_multicast(nls, skb, 0, group, gfp); |
1da177e4 | 1039 | } |
1da177e4 | 1040 | |
7b7232f3 | 1041 | int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr, |
0896b752 | 1042 | char *data, uint32_t data_size) |
1da177e4 | 1043 | { |
0896b752 AA |
1044 | struct nlmsghdr *nlh; |
1045 | struct sk_buff *skb; | |
1046 | struct iscsi_uevent *ev; | |
0896b752 | 1047 | char *pdu; |
790f39a2 | 1048 | struct iscsi_internal *priv; |
0896b752 AA |
1049 | int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) + |
1050 | data_size); | |
1051 | ||
790f39a2 MC |
1052 | priv = iscsi_if_transport_lookup(conn->transport); |
1053 | if (!priv) | |
1054 | return -EINVAL; | |
1055 | ||
43a145a3 | 1056 | skb = alloc_skb(len, GFP_ATOMIC); |
0896b752 | 1057 | if (!skb) { |
e5bd7b54 | 1058 | iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED); |
322d739d MC |
1059 | iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver " |
1060 | "control PDU: OOM\n"); | |
0896b752 AA |
1061 | return -ENOMEM; |
1062 | } | |
1da177e4 | 1063 | |
43514774 | 1064 | nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0); |
0896b752 AA |
1065 | ev = NLMSG_DATA(nlh); |
1066 | memset(ev, 0, sizeof(*ev)); | |
1067 | ev->transport_handle = iscsi_handle(conn->transport); | |
1068 | ev->type = ISCSI_KEVENT_RECV_PDU; | |
b5c7a12d MC |
1069 | ev->r.recv_req.cid = conn->cid; |
1070 | ev->r.recv_req.sid = iscsi_conn_get_sid(conn); | |
0896b752 AA |
1071 | pdu = (char*)ev + sizeof(*ev); |
1072 | memcpy(pdu, hdr, sizeof(struct iscsi_hdr)); | |
1073 | memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size); | |
1da177e4 | 1074 | |
43514774 | 1075 | return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC); |
1da177e4 | 1076 | } |
0896b752 | 1077 | EXPORT_SYMBOL_GPL(iscsi_recv_pdu); |
1da177e4 | 1078 | |
43514774 MC |
1079 | int iscsi_offload_mesg(struct Scsi_Host *shost, |
1080 | struct iscsi_transport *transport, uint32_t type, | |
1081 | char *data, uint16_t data_size) | |
1082 | { | |
1083 | struct nlmsghdr *nlh; | |
1084 | struct sk_buff *skb; | |
1085 | struct iscsi_uevent *ev; | |
1086 | int len = NLMSG_SPACE(sizeof(*ev) + data_size); | |
1087 | ||
a541f840 | 1088 | skb = alloc_skb(len, GFP_ATOMIC); |
43514774 MC |
1089 | if (!skb) { |
1090 | printk(KERN_ERR "can not deliver iscsi offload message:OOM\n"); | |
1091 | return -ENOMEM; | |
1092 | } | |
1093 | ||
1094 | nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0); | |
1095 | ev = NLMSG_DATA(nlh); | |
1096 | memset(ev, 0, sizeof(*ev)); | |
1097 | ev->type = type; | |
1098 | ev->transport_handle = iscsi_handle(transport); | |
1099 | switch (type) { | |
1100 | case ISCSI_KEVENT_PATH_REQ: | |
1101 | ev->r.req_path.host_no = shost->host_no; | |
1102 | break; | |
1103 | case ISCSI_KEVENT_IF_DOWN: | |
1104 | ev->r.notify_if_down.host_no = shost->host_no; | |
1105 | break; | |
1106 | } | |
1107 | ||
1108 | memcpy((char *)ev + sizeof(*ev), data, data_size); | |
1109 | ||
a541f840 | 1110 | return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC); |
43514774 MC |
1111 | } |
1112 | EXPORT_SYMBOL_GPL(iscsi_offload_mesg); | |
1113 | ||
e5bd7b54 | 1114 | void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error) |
1da177e4 | 1115 | { |
0896b752 AA |
1116 | struct nlmsghdr *nlh; |
1117 | struct sk_buff *skb; | |
1118 | struct iscsi_uevent *ev; | |
790f39a2 | 1119 | struct iscsi_internal *priv; |
0896b752 AA |
1120 | int len = NLMSG_SPACE(sizeof(*ev)); |
1121 | ||
790f39a2 MC |
1122 | priv = iscsi_if_transport_lookup(conn->transport); |
1123 | if (!priv) | |
1124 | return; | |
1125 | ||
43a145a3 | 1126 | skb = alloc_skb(len, GFP_ATOMIC); |
0896b752 | 1127 | if (!skb) { |
322d739d MC |
1128 | iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored " |
1129 | "conn error (%d)\n", error); | |
0896b752 AA |
1130 | return; |
1131 | } | |
1132 | ||
43514774 | 1133 | nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0); |
0896b752 AA |
1134 | ev = NLMSG_DATA(nlh); |
1135 | ev->transport_handle = iscsi_handle(conn->transport); | |
1136 | ev->type = ISCSI_KEVENT_CONN_ERROR; | |
0896b752 | 1137 | ev->r.connerror.error = error; |
b5c7a12d MC |
1138 | ev->r.connerror.cid = conn->cid; |
1139 | ev->r.connerror.sid = iscsi_conn_get_sid(conn); | |
1da177e4 | 1140 | |
43514774 | 1141 | iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC); |
1da177e4 | 1142 | |
322d739d MC |
1143 | iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n", |
1144 | error); | |
0896b752 | 1145 | } |
e5bd7b54 | 1146 | EXPORT_SYMBOL_GPL(iscsi_conn_error_event); |
0896b752 AA |
1147 | |
1148 | static int | |
43514774 MC |
1149 | iscsi_if_send_reply(uint32_t group, int seq, int type, int done, int multi, |
1150 | void *payload, int size) | |
0896b752 AA |
1151 | { |
1152 | struct sk_buff *skb; | |
1153 | struct nlmsghdr *nlh; | |
1154 | int len = NLMSG_SPACE(size); | |
1155 | int flags = multi ? NLM_F_MULTI : 0; | |
1156 | int t = done ? NLMSG_DONE : type; | |
1157 | ||
43a145a3 | 1158 | skb = alloc_skb(len, GFP_ATOMIC); |
239a7dc2 MC |
1159 | if (!skb) { |
1160 | printk(KERN_ERR "Could not allocate skb to send reply.\n"); | |
1161 | return -ENOMEM; | |
1162 | } | |
0896b752 | 1163 | |
43514774 | 1164 | nlh = __nlmsg_put(skb, 0, 0, t, (len - sizeof(*nlh)), 0); |
0896b752 AA |
1165 | nlh->nlmsg_flags = flags; |
1166 | memcpy(NLMSG_DATA(nlh), payload, size); | |
43514774 | 1167 | return iscsi_multicast_skb(skb, group, GFP_ATOMIC); |
1da177e4 | 1168 | } |
1da177e4 | 1169 | |
7b8631b5 | 1170 | static int |
5b940adf | 1171 | iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh) |
7b8631b5 MC |
1172 | { |
1173 | struct iscsi_uevent *ev = NLMSG_DATA(nlh); | |
1174 | struct iscsi_stats *stats; | |
1175 | struct sk_buff *skbstat; | |
1176 | struct iscsi_cls_conn *conn; | |
1177 | struct nlmsghdr *nlhstat; | |
1178 | struct iscsi_uevent *evstat; | |
790f39a2 | 1179 | struct iscsi_internal *priv; |
7b8631b5 MC |
1180 | int len = NLMSG_SPACE(sizeof(*ev) + |
1181 | sizeof(struct iscsi_stats) + | |
1182 | sizeof(struct iscsi_stats_custom) * | |
1183 | ISCSI_STATS_CUSTOM_MAX); | |
1184 | int err = 0; | |
0896b752 | 1185 | |
790f39a2 MC |
1186 | priv = iscsi_if_transport_lookup(transport); |
1187 | if (!priv) | |
1188 | return -EINVAL; | |
1189 | ||
b5c7a12d | 1190 | conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid); |
7b8631b5 MC |
1191 | if (!conn) |
1192 | return -EEXIST; | |
0896b752 | 1193 | |
7b8631b5 MC |
1194 | do { |
1195 | int actual_size; | |
0896b752 | 1196 | |
43a145a3 | 1197 | skbstat = alloc_skb(len, GFP_ATOMIC); |
7b8631b5 | 1198 | if (!skbstat) { |
322d739d MC |
1199 | iscsi_cls_conn_printk(KERN_ERR, conn, "can not " |
1200 | "deliver stats: OOM\n"); | |
7b8631b5 MC |
1201 | return -ENOMEM; |
1202 | } | |
1203 | ||
43514774 | 1204 | nlhstat = __nlmsg_put(skbstat, 0, 0, 0, |
7b8631b5 MC |
1205 | (len - sizeof(*nlhstat)), 0); |
1206 | evstat = NLMSG_DATA(nlhstat); | |
1207 | memset(evstat, 0, sizeof(*evstat)); | |
1208 | evstat->transport_handle = iscsi_handle(conn->transport); | |
1209 | evstat->type = nlh->nlmsg_type; | |
b5c7a12d MC |
1210 | evstat->u.get_stats.cid = |
1211 | ev->u.get_stats.cid; | |
1212 | evstat->u.get_stats.sid = | |
1213 | ev->u.get_stats.sid; | |
7b8631b5 MC |
1214 | stats = (struct iscsi_stats *) |
1215 | ((char*)evstat + sizeof(*evstat)); | |
1216 | memset(stats, 0, sizeof(*stats)); | |
1217 | ||
7b7232f3 | 1218 | transport->get_stats(conn, stats); |
7b8631b5 MC |
1219 | actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) + |
1220 | sizeof(struct iscsi_stats) + | |
1221 | sizeof(struct iscsi_stats_custom) * | |
1222 | stats->custom_length); | |
1223 | actual_size -= sizeof(*nlhstat); | |
1224 | actual_size = NLMSG_LENGTH(actual_size); | |
5b940adf | 1225 | skb_trim(skbstat, NLMSG_ALIGN(actual_size)); |
7b8631b5 MC |
1226 | nlhstat->nlmsg_len = actual_size; |
1227 | ||
43514774 MC |
1228 | err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID, |
1229 | GFP_ATOMIC); | |
7b8631b5 MC |
1230 | } while (err < 0 && err != -ECONNREFUSED); |
1231 | ||
1232 | return err; | |
0896b752 AA |
1233 | } |
1234 | ||
53cb8a1f | 1235 | /** |
26974789 MC |
1236 | * iscsi_session_event - send session destr. completion event |
1237 | * @session: iscsi class session | |
1238 | * @event: type of event | |
eb44820c | 1239 | */ |
26974789 MC |
1240 | int iscsi_session_event(struct iscsi_cls_session *session, |
1241 | enum iscsi_uevent_e event) | |
53cb8a1f MC |
1242 | { |
1243 | struct iscsi_internal *priv; | |
53cb8a1f MC |
1244 | struct Scsi_Host *shost; |
1245 | struct iscsi_uevent *ev; | |
1246 | struct sk_buff *skb; | |
1247 | struct nlmsghdr *nlh; | |
53cb8a1f MC |
1248 | int rc, len = NLMSG_SPACE(sizeof(*ev)); |
1249 | ||
26974789 | 1250 | priv = iscsi_if_transport_lookup(session->transport); |
53cb8a1f MC |
1251 | if (!priv) |
1252 | return -EINVAL; | |
53cb8a1f MC |
1253 | shost = iscsi_session_to_shost(session); |
1254 | ||
43a145a3 | 1255 | skb = alloc_skb(len, GFP_KERNEL); |
53cb8a1f | 1256 | if (!skb) { |
322d739d MC |
1257 | iscsi_cls_session_printk(KERN_ERR, session, |
1258 | "Cannot notify userspace of session " | |
1259 | "event %u\n", event); | |
53cb8a1f MC |
1260 | return -ENOMEM; |
1261 | } | |
1262 | ||
43514774 | 1263 | nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0); |
53cb8a1f | 1264 | ev = NLMSG_DATA(nlh); |
26974789 | 1265 | ev->transport_handle = iscsi_handle(session->transport); |
53cb8a1f | 1266 | |
26974789 MC |
1267 | ev->type = event; |
1268 | switch (event) { | |
1269 | case ISCSI_KEVENT_DESTROY_SESSION: | |
1270 | ev->r.d_session.host_no = shost->host_no; | |
1271 | ev->r.d_session.sid = session->sid; | |
1272 | break; | |
1273 | case ISCSI_KEVENT_CREATE_SESSION: | |
1274 | ev->r.c_session_ret.host_no = shost->host_no; | |
1275 | ev->r.c_session_ret.sid = session->sid; | |
1276 | break; | |
1277 | case ISCSI_KEVENT_UNBIND_SESSION: | |
1278 | ev->r.unbind_session.host_no = shost->host_no; | |
1279 | ev->r.unbind_session.sid = session->sid; | |
1280 | break; | |
1281 | default: | |
322d739d MC |
1282 | iscsi_cls_session_printk(KERN_ERR, session, "Invalid event " |
1283 | "%u.\n", event); | |
26974789 | 1284 | kfree_skb(skb); |
53cb8a1f | 1285 | return -EINVAL; |
53cb8a1f MC |
1286 | } |
1287 | ||
53cb8a1f MC |
1288 | /* |
1289 | * this will occur if the daemon is not up, so we just warn | |
1290 | * the user and when the daemon is restarted it will handle it | |
1291 | */ | |
43514774 | 1292 | rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL); |
ff491a73 | 1293 | if (rc == -ESRCH) |
322d739d MC |
1294 | iscsi_cls_session_printk(KERN_ERR, session, |
1295 | "Cannot notify userspace of session " | |
1296 | "event %u. Check iscsi daemon\n", | |
1297 | event); | |
632248aa MC |
1298 | |
1299 | ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n", | |
1300 | event, rc); | |
53cb8a1f MC |
1301 | return rc; |
1302 | } | |
26974789 | 1303 | EXPORT_SYMBOL_GPL(iscsi_session_event); |
53cb8a1f | 1304 | |
0896b752 | 1305 | static int |
d82ff9be MC |
1306 | iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep, |
1307 | struct iscsi_uevent *ev, uint32_t initial_cmdsn, | |
40753caa | 1308 | uint16_t cmds_max, uint16_t queue_depth) |
0896b752 AA |
1309 | { |
1310 | struct iscsi_transport *transport = priv->iscsi_transport; | |
7b7232f3 | 1311 | struct iscsi_cls_session *session; |
5e7facb7 | 1312 | struct Scsi_Host *shost; |
0896b752 | 1313 | |
d82ff9be | 1314 | session = transport->create_session(ep, cmds_max, queue_depth, |
5e7facb7 | 1315 | initial_cmdsn); |
7b7232f3 | 1316 | if (!session) |
7b8631b5 | 1317 | return -ENOMEM; |
0896b752 | 1318 | |
5e7facb7 MC |
1319 | shost = iscsi_session_to_shost(session); |
1320 | ev->r.c_session_ret.host_no = shost->host_no; | |
b5c7a12d | 1321 | ev->r.c_session_ret.sid = session->sid; |
632248aa MC |
1322 | ISCSI_DBG_TRANS_SESSION(session, |
1323 | "Completed creating transport session\n"); | |
0896b752 | 1324 | return 0; |
0896b752 AA |
1325 | } |
1326 | ||
1327 | static int | |
7b7232f3 | 1328 | iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev) |
0896b752 | 1329 | { |
7b8631b5 | 1330 | struct iscsi_cls_conn *conn; |
7b7232f3 | 1331 | struct iscsi_cls_session *session; |
7b8631b5 | 1332 | |
b5c7a12d MC |
1333 | session = iscsi_session_lookup(ev->u.c_conn.sid); |
1334 | if (!session) { | |
322d739d | 1335 | printk(KERN_ERR "iscsi: invalid session %d.\n", |
b5c7a12d | 1336 | ev->u.c_conn.sid); |
7b8631b5 | 1337 | return -EINVAL; |
b5c7a12d | 1338 | } |
0896b752 | 1339 | |
7b7232f3 | 1340 | conn = transport->create_conn(session, ev->u.c_conn.cid); |
b5c7a12d | 1341 | if (!conn) { |
322d739d MC |
1342 | iscsi_cls_session_printk(KERN_ERR, session, |
1343 | "couldn't create a new connection."); | |
7b7232f3 | 1344 | return -ENOMEM; |
b5c7a12d | 1345 | } |
0896b752 | 1346 | |
b5c7a12d MC |
1347 | ev->r.c_conn_ret.sid = session->sid; |
1348 | ev->r.c_conn_ret.cid = conn->cid; | |
632248aa MC |
1349 | |
1350 | ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n"); | |
0896b752 | 1351 | return 0; |
1da177e4 LT |
1352 | } |
1353 | ||
0896b752 AA |
1354 | static int |
1355 | iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev) | |
1356 | { | |
7b8631b5 | 1357 | struct iscsi_cls_conn *conn; |
0896b752 | 1358 | |
b5c7a12d | 1359 | conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid); |
0896b752 | 1360 | if (!conn) |
7b8631b5 | 1361 | return -EINVAL; |
0896b752 | 1362 | |
632248aa | 1363 | ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n"); |
7b8631b5 MC |
1364 | if (transport->destroy_conn) |
1365 | transport->destroy_conn(conn); | |
632248aa | 1366 | |
7b8631b5 | 1367 | return 0; |
0896b752 AA |
1368 | } |
1369 | ||
fd7255f5 MC |
1370 | static int |
1371 | iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev) | |
1372 | { | |
1373 | char *data = (char*)ev + sizeof(*ev); | |
1374 | struct iscsi_cls_conn *conn; | |
1375 | struct iscsi_cls_session *session; | |
a54a52ca | 1376 | int err = 0, value = 0; |
fd7255f5 MC |
1377 | |
1378 | session = iscsi_session_lookup(ev->u.set_param.sid); | |
1379 | conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid); | |
1380 | if (!conn || !session) | |
1381 | return -EINVAL; | |
1382 | ||
1383 | switch (ev->u.set_param.param) { | |
30a6c652 | 1384 | case ISCSI_PARAM_SESS_RECOVERY_TMO: |
a54a52ca | 1385 | sscanf(data, "%d", &value); |
fdd46dcb | 1386 | session->recovery_tmo = value; |
30a6c652 | 1387 | break; |
fd7255f5 | 1388 | default: |
a54a52ca MC |
1389 | err = transport->set_param(conn, ev->u.set_param.param, |
1390 | data, ev->u.set_param.len); | |
fd7255f5 MC |
1391 | } |
1392 | ||
1393 | return err; | |
1394 | } | |
1395 | ||
10eb0f01 MC |
1396 | static int iscsi_if_ep_connect(struct iscsi_transport *transport, |
1397 | struct iscsi_uevent *ev, int msg_type) | |
1398 | { | |
1399 | struct iscsi_endpoint *ep; | |
1400 | struct sockaddr *dst_addr; | |
1401 | struct Scsi_Host *shost = NULL; | |
1402 | int non_blocking, err = 0; | |
1403 | ||
1404 | if (!transport->ep_connect) | |
1405 | return -EINVAL; | |
1406 | ||
1407 | if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) { | |
1408 | shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no); | |
1409 | if (!shost) { | |
1410 | printk(KERN_ERR "ep connect failed. Could not find " | |
1411 | "host no %u\n", | |
1412 | ev->u.ep_connect_through_host.host_no); | |
1413 | return -ENODEV; | |
1414 | } | |
1415 | non_blocking = ev->u.ep_connect_through_host.non_blocking; | |
1416 | } else | |
1417 | non_blocking = ev->u.ep_connect.non_blocking; | |
1418 | ||
1419 | dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev)); | |
1420 | ep = transport->ep_connect(shost, dst_addr, non_blocking); | |
1421 | if (IS_ERR(ep)) { | |
1422 | err = PTR_ERR(ep); | |
1423 | goto release_host; | |
1424 | } | |
1425 | ||
1426 | ev->r.ep_connect_ret.handle = ep->id; | |
1427 | release_host: | |
1428 | if (shost) | |
1429 | scsi_host_put(shost); | |
1430 | return err; | |
1431 | } | |
1432 | ||
264faaaa OG |
1433 | static int |
1434 | iscsi_if_transport_ep(struct iscsi_transport *transport, | |
1435 | struct iscsi_uevent *ev, int msg_type) | |
1436 | { | |
d82ff9be | 1437 | struct iscsi_endpoint *ep; |
264faaaa OG |
1438 | int rc = 0; |
1439 | ||
1440 | switch (msg_type) { | |
10eb0f01 | 1441 | case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST: |
264faaaa | 1442 | case ISCSI_UEVENT_TRANSPORT_EP_CONNECT: |
10eb0f01 | 1443 | rc = iscsi_if_ep_connect(transport, ev, msg_type); |
264faaaa OG |
1444 | break; |
1445 | case ISCSI_UEVENT_TRANSPORT_EP_POLL: | |
1446 | if (!transport->ep_poll) | |
1447 | return -EINVAL; | |
1448 | ||
d82ff9be MC |
1449 | ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle); |
1450 | if (!ep) | |
1451 | return -EINVAL; | |
1452 | ||
1453 | ev->r.retcode = transport->ep_poll(ep, | |
264faaaa OG |
1454 | ev->u.ep_poll.timeout_ms); |
1455 | break; | |
1456 | case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT: | |
1457 | if (!transport->ep_disconnect) | |
1458 | return -EINVAL; | |
1459 | ||
d82ff9be MC |
1460 | ep = iscsi_lookup_endpoint(ev->u.ep_disconnect.ep_handle); |
1461 | if (!ep) | |
1462 | return -EINVAL; | |
1463 | ||
1464 | transport->ep_disconnect(ep); | |
264faaaa OG |
1465 | break; |
1466 | } | |
1467 | return rc; | |
1468 | } | |
1469 | ||
01cb225d MC |
1470 | static int |
1471 | iscsi_tgt_dscvr(struct iscsi_transport *transport, | |
1472 | struct iscsi_uevent *ev) | |
1473 | { | |
2174a04e | 1474 | struct Scsi_Host *shost; |
01cb225d | 1475 | struct sockaddr *dst_addr; |
2174a04e | 1476 | int err; |
01cb225d MC |
1477 | |
1478 | if (!transport->tgt_dscvr) | |
1479 | return -EINVAL; | |
1480 | ||
2174a04e | 1481 | shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no); |
315cb0ad | 1482 | if (!shost) { |
2174a04e MC |
1483 | printk(KERN_ERR "target discovery could not find host no %u\n", |
1484 | ev->u.tgt_dscvr.host_no); | |
1485 | return -ENODEV; | |
1486 | } | |
1487 | ||
1488 | ||
01cb225d | 1489 | dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev)); |
2174a04e MC |
1490 | err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type, |
1491 | ev->u.tgt_dscvr.enable, dst_addr); | |
1492 | scsi_host_put(shost); | |
1493 | return err; | |
01cb225d MC |
1494 | } |
1495 | ||
1d9bf13a MC |
1496 | static int |
1497 | iscsi_set_host_param(struct iscsi_transport *transport, | |
1498 | struct iscsi_uevent *ev) | |
1499 | { | |
1500 | char *data = (char*)ev + sizeof(*ev); | |
1501 | struct Scsi_Host *shost; | |
1502 | int err; | |
1503 | ||
1504 | if (!transport->set_host_param) | |
1505 | return -ENOSYS; | |
1506 | ||
1507 | shost = scsi_host_lookup(ev->u.set_host_param.host_no); | |
315cb0ad | 1508 | if (!shost) { |
1d9bf13a MC |
1509 | printk(KERN_ERR "set_host_param could not find host no %u\n", |
1510 | ev->u.set_host_param.host_no); | |
1511 | return -ENODEV; | |
1512 | } | |
1513 | ||
1514 | err = transport->set_host_param(shost, ev->u.set_host_param.param, | |
1515 | data, ev->u.set_host_param.len); | |
1516 | scsi_host_put(shost); | |
1517 | return err; | |
1518 | } | |
1519 | ||
0896b752 | 1520 | static int |
43514774 MC |
1521 | iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev) |
1522 | { | |
1523 | struct Scsi_Host *shost; | |
1524 | struct iscsi_path *params; | |
1525 | int err; | |
1526 | ||
1527 | if (!transport->set_path) | |
1528 | return -ENOSYS; | |
1529 | ||
1530 | shost = scsi_host_lookup(ev->u.set_path.host_no); | |
1531 | if (!shost) { | |
1532 | printk(KERN_ERR "set path could not find host no %u\n", | |
1533 | ev->u.set_path.host_no); | |
1534 | return -ENODEV; | |
1535 | } | |
1536 | ||
1537 | params = (struct iscsi_path *)((char *)ev + sizeof(*ev)); | |
1538 | err = transport->set_path(shost, params); | |
1539 | ||
1540 | scsi_host_put(shost); | |
1541 | return err; | |
1542 | } | |
1543 | ||
1544 | static int | |
1545 | iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group) | |
0896b752 AA |
1546 | { |
1547 | int err = 0; | |
1548 | struct iscsi_uevent *ev = NLMSG_DATA(nlh); | |
1549 | struct iscsi_transport *transport = NULL; | |
1550 | struct iscsi_internal *priv; | |
7b7232f3 MC |
1551 | struct iscsi_cls_session *session; |
1552 | struct iscsi_cls_conn *conn; | |
d82ff9be | 1553 | struct iscsi_endpoint *ep = NULL; |
0896b752 | 1554 | |
43514774 MC |
1555 | if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE) |
1556 | *group = ISCSI_NL_GRP_UIP; | |
1557 | else | |
1558 | *group = ISCSI_NL_GRP_ISCSID; | |
1559 | ||
0896b752 AA |
1560 | priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle)); |
1561 | if (!priv) | |
1562 | return -EINVAL; | |
1563 | transport = priv->iscsi_transport; | |
1564 | ||
7b7232f3 MC |
1565 | if (!try_module_get(transport->owner)) |
1566 | return -EINVAL; | |
1567 | ||
0896b752 AA |
1568 | switch (nlh->nlmsg_type) { |
1569 | case ISCSI_UEVENT_CREATE_SESSION: | |
d82ff9be | 1570 | err = iscsi_if_create_session(priv, ep, ev, |
40753caa MC |
1571 | ev->u.c_session.initial_cmdsn, |
1572 | ev->u.c_session.cmds_max, | |
1573 | ev->u.c_session.queue_depth); | |
1574 | break; | |
1575 | case ISCSI_UEVENT_CREATE_BOUND_SESSION: | |
d82ff9be | 1576 | ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle); |
c95fddc7 MC |
1577 | if (!ep) { |
1578 | err = -EINVAL; | |
1579 | break; | |
1580 | } | |
d82ff9be MC |
1581 | |
1582 | err = iscsi_if_create_session(priv, ep, ev, | |
40753caa MC |
1583 | ev->u.c_bound_session.initial_cmdsn, |
1584 | ev->u.c_bound_session.cmds_max, | |
1585 | ev->u.c_bound_session.queue_depth); | |
0896b752 AA |
1586 | break; |
1587 | case ISCSI_UEVENT_DESTROY_SESSION: | |
b5c7a12d | 1588 | session = iscsi_session_lookup(ev->u.d_session.sid); |
26974789 | 1589 | if (session) |
7b7232f3 | 1590 | transport->destroy_session(session); |
26974789 MC |
1591 | else |
1592 | err = -EINVAL; | |
1593 | break; | |
1594 | case ISCSI_UEVENT_UNBIND_SESSION: | |
1595 | session = iscsi_session_lookup(ev->u.d_session.sid); | |
1596 | if (session) | |
06d25af4 MC |
1597 | scsi_queue_work(iscsi_session_to_shost(session), |
1598 | &session->unbind_work); | |
26974789 | 1599 | else |
7b7232f3 | 1600 | err = -EINVAL; |
0896b752 AA |
1601 | break; |
1602 | case ISCSI_UEVENT_CREATE_CONN: | |
1603 | err = iscsi_if_create_conn(transport, ev); | |
1604 | break; | |
1605 | case ISCSI_UEVENT_DESTROY_CONN: | |
1606 | err = iscsi_if_destroy_conn(transport, ev); | |
1607 | break; | |
1608 | case ISCSI_UEVENT_BIND_CONN: | |
b5c7a12d MC |
1609 | session = iscsi_session_lookup(ev->u.b_conn.sid); |
1610 | conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid); | |
7b7232f3 MC |
1611 | |
1612 | if (session && conn) | |
1613 | ev->r.retcode = transport->bind_conn(session, conn, | |
264faaaa | 1614 | ev->u.b_conn.transport_eph, |
7b7232f3 MC |
1615 | ev->u.b_conn.is_leading); |
1616 | else | |
1617 | err = -EINVAL; | |
0896b752 AA |
1618 | break; |
1619 | case ISCSI_UEVENT_SET_PARAM: | |
fd7255f5 | 1620 | err = iscsi_set_param(transport, ev); |
0896b752 AA |
1621 | break; |
1622 | case ISCSI_UEVENT_START_CONN: | |
b5c7a12d | 1623 | conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid); |
7b7232f3 MC |
1624 | if (conn) |
1625 | ev->r.retcode = transport->start_conn(conn); | |
1626 | else | |
1627 | err = -EINVAL; | |
0896b752 AA |
1628 | break; |
1629 | case ISCSI_UEVENT_STOP_CONN: | |
b5c7a12d | 1630 | conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid); |
7b7232f3 MC |
1631 | if (conn) |
1632 | transport->stop_conn(conn, ev->u.stop_conn.flag); | |
1633 | else | |
1634 | err = -EINVAL; | |
0896b752 AA |
1635 | break; |
1636 | case ISCSI_UEVENT_SEND_PDU: | |
b5c7a12d | 1637 | conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid); |
7b7232f3 MC |
1638 | if (conn) |
1639 | ev->r.retcode = transport->send_pdu(conn, | |
1640 | (struct iscsi_hdr*)((char*)ev + sizeof(*ev)), | |
1641 | (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size, | |
1642 | ev->u.send_pdu.data_size); | |
1643 | else | |
1644 | err = -EINVAL; | |
0896b752 AA |
1645 | break; |
1646 | case ISCSI_UEVENT_GET_STATS: | |
5b940adf | 1647 | err = iscsi_if_get_stats(transport, nlh); |
0896b752 | 1648 | break; |
264faaaa OG |
1649 | case ISCSI_UEVENT_TRANSPORT_EP_CONNECT: |
1650 | case ISCSI_UEVENT_TRANSPORT_EP_POLL: | |
1651 | case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT: | |
10eb0f01 | 1652 | case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST: |
264faaaa OG |
1653 | err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type); |
1654 | break; | |
01cb225d MC |
1655 | case ISCSI_UEVENT_TGT_DSCVR: |
1656 | err = iscsi_tgt_dscvr(transport, ev); | |
1657 | break; | |
1d9bf13a MC |
1658 | case ISCSI_UEVENT_SET_HOST_PARAM: |
1659 | err = iscsi_set_host_param(transport, ev); | |
1660 | break; | |
43514774 MC |
1661 | case ISCSI_UEVENT_PATH_UPDATE: |
1662 | err = iscsi_set_path(transport, ev); | |
1663 | break; | |
0896b752 | 1664 | default: |
1d9bf13a | 1665 | err = -ENOSYS; |
0896b752 AA |
1666 | break; |
1667 | } | |
1668 | ||
7b7232f3 | 1669 | module_put(transport->owner); |
0896b752 AA |
1670 | return err; |
1671 | } | |
1672 | ||
b5c7a12d | 1673 | /* |
cd40b7d3 DL |
1674 | * Get message from skb. Each message is processed by iscsi_if_recv_msg. |
1675 | * Malformed skbs with wrong lengths or invalid creds are not processed. | |
b5c7a12d | 1676 | */ |
0896b752 | 1677 | static void |
cd40b7d3 | 1678 | iscsi_if_rx(struct sk_buff *skb) |
0896b752 | 1679 | { |
0b950672 | 1680 | mutex_lock(&rx_queue_mutex); |
cd40b7d3 DL |
1681 | while (skb->len >= NLMSG_SPACE(0)) { |
1682 | int err; | |
1683 | uint32_t rlen; | |
1684 | struct nlmsghdr *nlh; | |
1685 | struct iscsi_uevent *ev; | |
43514774 | 1686 | uint32_t group; |
cd40b7d3 DL |
1687 | |
1688 | nlh = nlmsg_hdr(skb); | |
1689 | if (nlh->nlmsg_len < sizeof(*nlh) || | |
1690 | skb->len < nlh->nlmsg_len) { | |
1691 | break; | |
ee7f8e40 | 1692 | } |
ee7f8e40 | 1693 | |
cd40b7d3 DL |
1694 | ev = NLMSG_DATA(nlh); |
1695 | rlen = NLMSG_ALIGN(nlh->nlmsg_len); | |
1696 | if (rlen > skb->len) | |
1697 | rlen = skb->len; | |
0896b752 | 1698 | |
43514774 | 1699 | err = iscsi_if_recv_msg(skb, nlh, &group); |
cd40b7d3 DL |
1700 | if (err) { |
1701 | ev->type = ISCSI_KEVENT_IF_ERROR; | |
1702 | ev->iferror = err; | |
0896b752 | 1703 | } |
cd40b7d3 DL |
1704 | do { |
1705 | /* | |
1706 | * special case for GET_STATS: | |
1707 | * on success - sending reply and stats from | |
1708 | * inside of if_recv_msg(), | |
1709 | * on error - fall through. | |
1710 | */ | |
1711 | if (ev->type == ISCSI_UEVENT_GET_STATS && !err) | |
1712 | break; | |
43514774 | 1713 | err = iscsi_if_send_reply(group, nlh->nlmsg_seq, |
cd40b7d3 DL |
1714 | nlh->nlmsg_type, 0, 0, ev, sizeof(*ev)); |
1715 | } while (err < 0 && err != -ECONNREFUSED); | |
1716 | skb_pull(skb, rlen); | |
0896b752 | 1717 | } |
0b950672 | 1718 | mutex_unlock(&rx_queue_mutex); |
0896b752 | 1719 | } |
1da177e4 | 1720 | |
fd7255f5 | 1721 | #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store) \ |
ee959b00 | 1722 | struct device_attribute dev_attr_##_prefix##_##_name = \ |
fd7255f5 MC |
1723 | __ATTR(_name,_mode,_show,_store) |
1724 | ||
1da177e4 | 1725 | /* |
0896b752 | 1726 | * iSCSI connection attrs |
1da177e4 | 1727 | */ |
a54a52ca | 1728 | #define iscsi_conn_attr_show(param) \ |
0896b752 | 1729 | static ssize_t \ |
ee959b00 TJ |
1730 | show_conn_param_##param(struct device *dev, \ |
1731 | struct device_attribute *attr, char *buf) \ | |
0896b752 | 1732 | { \ |
ee959b00 | 1733 | struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent); \ |
7b8631b5 | 1734 | struct iscsi_transport *t = conn->transport; \ |
a54a52ca | 1735 | return t->get_conn_param(conn, param, buf); \ |
0896b752 AA |
1736 | } |
1737 | ||
a54a52ca MC |
1738 | #define iscsi_conn_attr(field, param) \ |
1739 | iscsi_conn_attr_show(param) \ | |
1740 | static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param, \ | |
fd7255f5 | 1741 | NULL); |
0896b752 | 1742 | |
a54a52ca MC |
1743 | iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH); |
1744 | iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH); | |
1745 | iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN); | |
1746 | iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN); | |
1747 | iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN); | |
1748 | iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN); | |
1749 | iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT); | |
1750 | iscsi_conn_attr(port, ISCSI_PARAM_CONN_PORT); | |
1751 | iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN); | |
1752 | iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS); | |
1753 | iscsi_conn_attr(address, ISCSI_PARAM_CONN_ADDRESS); | |
f6d5180c MC |
1754 | iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO); |
1755 | iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO); | |
1da177e4 LT |
1756 | |
1757 | /* | |
0896b752 | 1758 | * iSCSI session attrs |
1da177e4 | 1759 | */ |
b2c64167 | 1760 | #define iscsi_session_attr_show(param, perm) \ |
fd7255f5 | 1761 | static ssize_t \ |
ee959b00 TJ |
1762 | show_session_param_##param(struct device *dev, \ |
1763 | struct device_attribute *attr, char *buf) \ | |
fd7255f5 | 1764 | { \ |
ee959b00 TJ |
1765 | struct iscsi_cls_session *session = \ |
1766 | iscsi_dev_to_session(dev->parent); \ | |
fd7255f5 | 1767 | struct iscsi_transport *t = session->transport; \ |
b2c64167 MC |
1768 | \ |
1769 | if (perm && !capable(CAP_SYS_ADMIN)) \ | |
1770 | return -EACCES; \ | |
a54a52ca | 1771 | return t->get_session_param(session, param, buf); \ |
fd7255f5 MC |
1772 | } |
1773 | ||
b2c64167 MC |
1774 | #define iscsi_session_attr(field, param, perm) \ |
1775 | iscsi_session_attr_show(param, perm) \ | |
a54a52ca | 1776 | static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \ |
fd7255f5 MC |
1777 | NULL); |
1778 | ||
b2c64167 MC |
1779 | iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0); |
1780 | iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0); | |
1781 | iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0); | |
1782 | iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0); | |
1783 | iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0); | |
1784 | iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0); | |
1785 | iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0); | |
1786 | iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0); | |
1787 | iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0); | |
1788 | iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0); | |
1789 | iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1); | |
1790 | iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1); | |
1791 | iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1); | |
1792 | iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1); | |
4cd49ea1 MC |
1793 | iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0); |
1794 | iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0); | |
1795 | iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0); | |
3fe5ae8b | 1796 | iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0); |
88dfd340 | 1797 | iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0); |
3b2bef1f VC |
1798 | iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0); |
1799 | iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0); | |
1da177e4 | 1800 | |
6eabafbe | 1801 | static ssize_t |
ee959b00 TJ |
1802 | show_priv_session_state(struct device *dev, struct device_attribute *attr, |
1803 | char *buf) | |
6eabafbe | 1804 | { |
ee959b00 | 1805 | struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent); |
6eabafbe MC |
1806 | return sprintf(buf, "%s\n", iscsi_session_state_name(session->state)); |
1807 | } | |
1808 | static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state, | |
1809 | NULL); | |
1810 | ||
fd7255f5 MC |
1811 | #define iscsi_priv_session_attr_show(field, format) \ |
1812 | static ssize_t \ | |
ee959b00 TJ |
1813 | show_priv_session_##field(struct device *dev, \ |
1814 | struct device_attribute *attr, char *buf) \ | |
fd7255f5 | 1815 | { \ |
ee959b00 TJ |
1816 | struct iscsi_cls_session *session = \ |
1817 | iscsi_dev_to_session(dev->parent); \ | |
fe4f0bde VC |
1818 | if (session->field == -1) \ |
1819 | return sprintf(buf, "off\n"); \ | |
fd7255f5 MC |
1820 | return sprintf(buf, format"\n", session->field); \ |
1821 | } | |
1822 | ||
fe4f0bde VC |
1823 | #define iscsi_priv_session_attr_store(field) \ |
1824 | static ssize_t \ | |
1825 | store_priv_session_##field(struct device *dev, \ | |
1826 | struct device_attribute *attr, \ | |
1827 | const char *buf, size_t count) \ | |
1828 | { \ | |
1829 | int val; \ | |
1830 | char *cp; \ | |
1831 | struct iscsi_cls_session *session = \ | |
1832 | iscsi_dev_to_session(dev->parent); \ | |
1833 | if ((session->state == ISCSI_SESSION_FREE) || \ | |
1834 | (session->state == ISCSI_SESSION_FAILED)) \ | |
1835 | return -EBUSY; \ | |
1836 | if (strncmp(buf, "off", 3) == 0) \ | |
1837 | session->field = -1; \ | |
1838 | else { \ | |
1839 | val = simple_strtoul(buf, &cp, 0); \ | |
1840 | if (*cp != '\0' && *cp != '\n') \ | |
1841 | return -EINVAL; \ | |
1842 | session->field = val; \ | |
1843 | } \ | |
1844 | return count; \ | |
1845 | } | |
1846 | ||
1847 | #define iscsi_priv_session_rw_attr(field, format) \ | |
fd7255f5 | 1848 | iscsi_priv_session_attr_show(field, format) \ |
fe4f0bde VC |
1849 | iscsi_priv_session_attr_store(field) \ |
1850 | static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUGO, \ | |
1851 | show_priv_session_##field, \ | |
1852 | store_priv_session_##field) | |
1853 | iscsi_priv_session_rw_attr(recovery_tmo, "%d"); | |
fd7255f5 | 1854 | |
1819dc81 MC |
1855 | /* |
1856 | * iSCSI host attrs | |
1857 | */ | |
1858 | #define iscsi_host_attr_show(param) \ | |
1859 | static ssize_t \ | |
ee959b00 TJ |
1860 | show_host_param_##param(struct device *dev, \ |
1861 | struct device_attribute *attr, char *buf) \ | |
1819dc81 | 1862 | { \ |
ee959b00 | 1863 | struct Scsi_Host *shost = transport_class_to_shost(dev); \ |
1819dc81 MC |
1864 | struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \ |
1865 | return priv->iscsi_transport->get_host_param(shost, param, buf); \ | |
1866 | } | |
1867 | ||
1868 | #define iscsi_host_attr(field, param) \ | |
1869 | iscsi_host_attr_show(param) \ | |
1870 | static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param, \ | |
1871 | NULL); | |
1872 | ||
d8196ed2 | 1873 | iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME); |
1819dc81 | 1874 | iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS); |
d8196ed2 | 1875 | iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS); |
8ad5781a | 1876 | iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME); |
1819dc81 | 1877 | |
fd7255f5 MC |
1878 | #define SETUP_PRIV_SESSION_RD_ATTR(field) \ |
1879 | do { \ | |
ee959b00 | 1880 | priv->session_attrs[count] = &dev_attr_priv_sess_##field; \ |
fd7255f5 MC |
1881 | count++; \ |
1882 | } while (0) | |
1883 | ||
fe4f0bde VC |
1884 | #define SETUP_PRIV_SESSION_RW_ATTR(field) \ |
1885 | do { \ | |
1886 | priv->session_attrs[count] = &dev_attr_priv_sess_##field; \ | |
1887 | count++; \ | |
1888 | } while (0) | |
a54a52ca | 1889 | |
fd7255f5 MC |
1890 | #define SETUP_SESSION_RD_ATTR(field, param_flag) \ |
1891 | do { \ | |
1892 | if (tt->param_mask & param_flag) { \ | |
ee959b00 | 1893 | priv->session_attrs[count] = &dev_attr_sess_##field; \ |
1da177e4 | 1894 | count++; \ |
fd7255f5 MC |
1895 | } \ |
1896 | } while (0) | |
1897 | ||
fd7255f5 MC |
1898 | #define SETUP_CONN_RD_ATTR(field, param_flag) \ |
1899 | do { \ | |
1900 | if (tt->param_mask & param_flag) { \ | |
ee959b00 | 1901 | priv->conn_attrs[count] = &dev_attr_conn_##field; \ |
fd7255f5 MC |
1902 | count++; \ |
1903 | } \ | |
1904 | } while (0) | |
1da177e4 | 1905 | |
1819dc81 MC |
1906 | #define SETUP_HOST_RD_ATTR(field, param_flag) \ |
1907 | do { \ | |
1908 | if (tt->host_param_mask & param_flag) { \ | |
ee959b00 | 1909 | priv->host_attrs[count] = &dev_attr_host_##field; \ |
1819dc81 MC |
1910 | count++; \ |
1911 | } \ | |
1912 | } while (0) | |
1913 | ||
0896b752 AA |
1914 | static int iscsi_session_match(struct attribute_container *cont, |
1915 | struct device *dev) | |
1da177e4 | 1916 | { |
7b8631b5 | 1917 | struct iscsi_cls_session *session; |
1da177e4 | 1918 | struct Scsi_Host *shost; |
0896b752 AA |
1919 | struct iscsi_internal *priv; |
1920 | ||
1921 | if (!iscsi_is_session_dev(dev)) | |
1922 | return 0; | |
1da177e4 | 1923 | |
7b8631b5 MC |
1924 | session = iscsi_dev_to_session(dev); |
1925 | shost = iscsi_session_to_shost(session); | |
0896b752 | 1926 | if (!shost->transportt) |
1da177e4 LT |
1927 | return 0; |
1928 | ||
0896b752 AA |
1929 | priv = to_iscsi_internal(shost->transportt); |
1930 | if (priv->session_cont.ac.class != &iscsi_session_class.class) | |
1da177e4 LT |
1931 | return 0; |
1932 | ||
0896b752 | 1933 | return &priv->session_cont.ac == cont; |
1da177e4 LT |
1934 | } |
1935 | ||
0896b752 AA |
1936 | static int iscsi_conn_match(struct attribute_container *cont, |
1937 | struct device *dev) | |
1938 | { | |
7b8631b5 MC |
1939 | struct iscsi_cls_session *session; |
1940 | struct iscsi_cls_conn *conn; | |
1da177e4 | 1941 | struct Scsi_Host *shost; |
0896b752 | 1942 | struct iscsi_internal *priv; |
1da177e4 | 1943 | |
0896b752 | 1944 | if (!iscsi_is_conn_dev(dev)) |
1da177e4 LT |
1945 | return 0; |
1946 | ||
7b8631b5 MC |
1947 | conn = iscsi_dev_to_conn(dev); |
1948 | session = iscsi_dev_to_session(conn->dev.parent); | |
1949 | shost = iscsi_session_to_shost(session); | |
1950 | ||
0896b752 | 1951 | if (!shost->transportt) |
1da177e4 LT |
1952 | return 0; |
1953 | ||
0896b752 AA |
1954 | priv = to_iscsi_internal(shost->transportt); |
1955 | if (priv->conn_cont.ac.class != &iscsi_connection_class.class) | |
1956 | return 0; | |
1da177e4 | 1957 | |
0896b752 AA |
1958 | return &priv->conn_cont.ac == cont; |
1959 | } | |
1960 | ||
30a6c652 MC |
1961 | static int iscsi_host_match(struct attribute_container *cont, |
1962 | struct device *dev) | |
1963 | { | |
1964 | struct Scsi_Host *shost; | |
1965 | struct iscsi_internal *priv; | |
1966 | ||
1967 | if (!scsi_is_host_device(dev)) | |
1968 | return 0; | |
1969 | ||
1970 | shost = dev_to_shost(dev); | |
1971 | if (!shost->transportt || | |
1972 | shost->transportt->host_attrs.ac.class != &iscsi_host_class.class) | |
1973 | return 0; | |
1974 | ||
1975 | priv = to_iscsi_internal(shost->transportt); | |
1976 | return &priv->t.host_attrs.ac == cont; | |
1977 | } | |
1978 | ||
7b8631b5 MC |
1979 | struct scsi_transport_template * |
1980 | iscsi_register_transport(struct iscsi_transport *tt) | |
0896b752 AA |
1981 | { |
1982 | struct iscsi_internal *priv; | |
1983 | unsigned long flags; | |
1984 | int count = 0, err; | |
1985 | ||
1986 | BUG_ON(!tt); | |
1987 | ||
1988 | priv = iscsi_if_transport_lookup(tt); | |
1989 | if (priv) | |
7b8631b5 | 1990 | return NULL; |
0896b752 | 1991 | |
24669f75 | 1992 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
0896b752 | 1993 | if (!priv) |
7b8631b5 | 1994 | return NULL; |
0896b752 | 1995 | INIT_LIST_HEAD(&priv->list); |
0896b752 | 1996 | priv->iscsi_transport = tt; |
30a6c652 | 1997 | priv->t.user_scan = iscsi_user_scan; |
06d25af4 | 1998 | priv->t.create_work_queue = 1; |
0896b752 | 1999 | |
ee959b00 | 2000 | priv->dev.class = &iscsi_transport_class; |
71610f55 | 2001 | dev_set_name(&priv->dev, "%s", tt->name); |
ee959b00 | 2002 | err = device_register(&priv->dev); |
0896b752 AA |
2003 | if (err) |
2004 | goto free_priv; | |
2005 | ||
ee959b00 | 2006 | err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group); |
0896b752 | 2007 | if (err) |
ee959b00 | 2008 | goto unregister_dev; |
0896b752 | 2009 | |
30a6c652 MC |
2010 | /* host parameters */ |
2011 | priv->t.host_attrs.ac.attrs = &priv->host_attrs[0]; | |
2012 | priv->t.host_attrs.ac.class = &iscsi_host_class.class; | |
2013 | priv->t.host_attrs.ac.match = iscsi_host_match; | |
32c6e1b9 | 2014 | priv->t.host_size = sizeof(struct iscsi_cls_host); |
30a6c652 MC |
2015 | transport_container_register(&priv->t.host_attrs); |
2016 | ||
d8196ed2 | 2017 | SETUP_HOST_RD_ATTR(netdev, ISCSI_HOST_NETDEV_NAME); |
22236961 | 2018 | SETUP_HOST_RD_ATTR(ipaddress, ISCSI_HOST_IPADDRESS); |
1819dc81 | 2019 | SETUP_HOST_RD_ATTR(hwaddress, ISCSI_HOST_HWADDRESS); |
8ad5781a | 2020 | SETUP_HOST_RD_ATTR(initiatorname, ISCSI_HOST_INITIATOR_NAME); |
1819dc81 MC |
2021 | BUG_ON(count > ISCSI_HOST_ATTRS); |
2022 | priv->host_attrs[count] = NULL; | |
2023 | count = 0; | |
2024 | ||
0896b752 AA |
2025 | /* connection parameters */ |
2026 | priv->conn_cont.ac.attrs = &priv->conn_attrs[0]; | |
2027 | priv->conn_cont.ac.class = &iscsi_connection_class.class; | |
2028 | priv->conn_cont.ac.match = iscsi_conn_match; | |
2029 | transport_container_register(&priv->conn_cont); | |
1da177e4 | 2030 | |
fd7255f5 MC |
2031 | SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_MAX_RECV_DLENGTH); |
2032 | SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_MAX_XMIT_DLENGTH); | |
2033 | SETUP_CONN_RD_ATTR(header_digest, ISCSI_HDRDGST_EN); | |
2034 | SETUP_CONN_RD_ATTR(data_digest, ISCSI_DATADGST_EN); | |
2035 | SETUP_CONN_RD_ATTR(ifmarker, ISCSI_IFMARKER_EN); | |
2036 | SETUP_CONN_RD_ATTR(ofmarker, ISCSI_OFMARKER_EN); | |
2037 | SETUP_CONN_RD_ATTR(address, ISCSI_CONN_ADDRESS); | |
2038 | SETUP_CONN_RD_ATTR(port, ISCSI_CONN_PORT); | |
8d2860b3 | 2039 | SETUP_CONN_RD_ATTR(exp_statsn, ISCSI_EXP_STATSN); |
a54a52ca MC |
2040 | SETUP_CONN_RD_ATTR(persistent_address, ISCSI_PERSISTENT_ADDRESS); |
2041 | SETUP_CONN_RD_ATTR(persistent_port, ISCSI_PERSISTENT_PORT); | |
f6d5180c MC |
2042 | SETUP_CONN_RD_ATTR(ping_tmo, ISCSI_PING_TMO); |
2043 | SETUP_CONN_RD_ATTR(recv_tmo, ISCSI_RECV_TMO); | |
0896b752 AA |
2044 | |
2045 | BUG_ON(count > ISCSI_CONN_ATTRS); | |
2046 | priv->conn_attrs[count] = NULL; | |
1da177e4 | 2047 | count = 0; |
1da177e4 | 2048 | |
0896b752 AA |
2049 | /* session parameters */ |
2050 | priv->session_cont.ac.attrs = &priv->session_attrs[0]; | |
2051 | priv->session_cont.ac.class = &iscsi_session_class.class; | |
2052 | priv->session_cont.ac.match = iscsi_session_match; | |
2053 | transport_container_register(&priv->session_cont); | |
2054 | ||
fd7255f5 MC |
2055 | SETUP_SESSION_RD_ATTR(initial_r2t, ISCSI_INITIAL_R2T_EN); |
2056 | SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_MAX_R2T); | |
2057 | SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_IMM_DATA_EN); | |
2058 | SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_FIRST_BURST); | |
2059 | SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_MAX_BURST); | |
2060 | SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PDU_INORDER_EN); | |
2061 | SETUP_SESSION_RD_ATTR(data_seq_in_order, ISCSI_DATASEQ_INORDER_EN); | |
2062 | SETUP_SESSION_RD_ATTR(erl, ISCSI_ERL); | |
a54a52ca MC |
2063 | SETUP_SESSION_RD_ATTR(targetname, ISCSI_TARGET_NAME); |
2064 | SETUP_SESSION_RD_ATTR(tpgt, ISCSI_TPGT); | |
b2c64167 MC |
2065 | SETUP_SESSION_RD_ATTR(password, ISCSI_USERNAME); |
2066 | SETUP_SESSION_RD_ATTR(password_in, ISCSI_USERNAME_IN); | |
2067 | SETUP_SESSION_RD_ATTR(username, ISCSI_PASSWORD); | |
2068 | SETUP_SESSION_RD_ATTR(username_in, ISCSI_PASSWORD_IN); | |
843c0a8a | 2069 | SETUP_SESSION_RD_ATTR(fast_abort, ISCSI_FAST_ABORT); |
4cd49ea1 MC |
2070 | SETUP_SESSION_RD_ATTR(abort_tmo, ISCSI_ABORT_TMO); |
2071 | SETUP_SESSION_RD_ATTR(lu_reset_tmo,ISCSI_LU_RESET_TMO); | |
3fe5ae8b | 2072 | SETUP_SESSION_RD_ATTR(tgt_reset_tmo,ISCSI_TGT_RESET_TMO); |
88dfd340 MC |
2073 | SETUP_SESSION_RD_ATTR(ifacename, ISCSI_IFACE_NAME); |
2074 | SETUP_SESSION_RD_ATTR(initiatorname, ISCSI_INITIATOR_NAME); | |
3b2bef1f | 2075 | SETUP_SESSION_RD_ATTR(targetalias, ISCSI_TARGET_ALIAS); |
fe4f0bde | 2076 | SETUP_PRIV_SESSION_RW_ATTR(recovery_tmo); |
6eabafbe | 2077 | SETUP_PRIV_SESSION_RD_ATTR(state); |
fd7255f5 | 2078 | |
0896b752 AA |
2079 | BUG_ON(count > ISCSI_SESSION_ATTRS); |
2080 | priv->session_attrs[count] = NULL; | |
2081 | ||
2082 | spin_lock_irqsave(&iscsi_transport_lock, flags); | |
2083 | list_add(&priv->list, &iscsi_transports); | |
2084 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
2085 | ||
2086 | printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name); | |
7b8631b5 | 2087 | return &priv->t; |
1da177e4 | 2088 | |
ee959b00 TJ |
2089 | unregister_dev: |
2090 | device_unregister(&priv->dev); | |
d82ff9be | 2091 | return NULL; |
0896b752 AA |
2092 | free_priv: |
2093 | kfree(priv); | |
7b8631b5 | 2094 | return NULL; |
1da177e4 | 2095 | } |
0896b752 AA |
2096 | EXPORT_SYMBOL_GPL(iscsi_register_transport); |
2097 | ||
2098 | int iscsi_unregister_transport(struct iscsi_transport *tt) | |
2099 | { | |
2100 | struct iscsi_internal *priv; | |
2101 | unsigned long flags; | |
2102 | ||
2103 | BUG_ON(!tt); | |
2104 | ||
0b950672 | 2105 | mutex_lock(&rx_queue_mutex); |
0896b752 AA |
2106 | |
2107 | priv = iscsi_if_transport_lookup(tt); | |
2108 | BUG_ON (!priv); | |
2109 | ||
0896b752 AA |
2110 | spin_lock_irqsave(&iscsi_transport_lock, flags); |
2111 | list_del(&priv->list); | |
2112 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
2113 | ||
2114 | transport_container_unregister(&priv->conn_cont); | |
2115 | transport_container_unregister(&priv->session_cont); | |
30a6c652 | 2116 | transport_container_unregister(&priv->t.host_attrs); |
0896b752 | 2117 | |
ee959b00 TJ |
2118 | sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group); |
2119 | device_unregister(&priv->dev); | |
0b950672 | 2120 | mutex_unlock(&rx_queue_mutex); |
1da177e4 | 2121 | |
0896b752 AA |
2122 | return 0; |
2123 | } | |
2124 | EXPORT_SYMBOL_GPL(iscsi_unregister_transport); | |
1da177e4 | 2125 | |
1da177e4 LT |
2126 | static __init int iscsi_transport_init(void) |
2127 | { | |
0896b752 | 2128 | int err; |
1da177e4 | 2129 | |
09492605 | 2130 | printk(KERN_INFO "Loading iSCSI transport class v%s.\n", |
f4246b33 MC |
2131 | ISCSI_TRANSPORT_VERSION); |
2132 | ||
41be1444 MC |
2133 | atomic_set(&iscsi_session_nr, 0); |
2134 | ||
0896b752 | 2135 | err = class_register(&iscsi_transport_class); |
1da177e4 LT |
2136 | if (err) |
2137 | return err; | |
0896b752 | 2138 | |
d82ff9be | 2139 | err = class_register(&iscsi_endpoint_class); |
0896b752 AA |
2140 | if (err) |
2141 | goto unregister_transport_class; | |
2142 | ||
d82ff9be MC |
2143 | err = transport_class_register(&iscsi_host_class); |
2144 | if (err) | |
2145 | goto unregister_endpoint_class; | |
2146 | ||
30a6c652 MC |
2147 | err = transport_class_register(&iscsi_connection_class); |
2148 | if (err) | |
2149 | goto unregister_host_class; | |
2150 | ||
0896b752 AA |
2151 | err = transport_class_register(&iscsi_session_class); |
2152 | if (err) | |
2153 | goto unregister_conn_class; | |
2154 | ||
d82ff9be MC |
2155 | nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, 1, iscsi_if_rx, |
2156 | NULL, THIS_MODULE); | |
0896b752 AA |
2157 | if (!nls) { |
2158 | err = -ENOBUFS; | |
43a145a3 | 2159 | goto unregister_session_class; |
0896b752 AA |
2160 | } |
2161 | ||
d8bf541e MC |
2162 | iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh"); |
2163 | if (!iscsi_eh_timer_workq) | |
2164 | goto release_nls; | |
2165 | ||
43a145a3 | 2166 | return 0; |
0896b752 | 2167 | |
d8bf541e | 2168 | release_nls: |
b7c6ba6e | 2169 | netlink_kernel_release(nls); |
0896b752 AA |
2170 | unregister_session_class: |
2171 | transport_class_unregister(&iscsi_session_class); | |
2172 | unregister_conn_class: | |
2173 | transport_class_unregister(&iscsi_connection_class); | |
30a6c652 MC |
2174 | unregister_host_class: |
2175 | transport_class_unregister(&iscsi_host_class); | |
d82ff9be MC |
2176 | unregister_endpoint_class: |
2177 | class_unregister(&iscsi_endpoint_class); | |
0896b752 AA |
2178 | unregister_transport_class: |
2179 | class_unregister(&iscsi_transport_class); | |
2180 | return err; | |
1da177e4 LT |
2181 | } |
2182 | ||
2183 | static void __exit iscsi_transport_exit(void) | |
2184 | { | |
d8bf541e | 2185 | destroy_workqueue(iscsi_eh_timer_workq); |
b7c6ba6e | 2186 | netlink_kernel_release(nls); |
0896b752 AA |
2187 | transport_class_unregister(&iscsi_connection_class); |
2188 | transport_class_unregister(&iscsi_session_class); | |
30a6c652 | 2189 | transport_class_unregister(&iscsi_host_class); |
d82ff9be | 2190 | class_unregister(&iscsi_endpoint_class); |
0896b752 | 2191 | class_unregister(&iscsi_transport_class); |
1da177e4 LT |
2192 | } |
2193 | ||
2194 | module_init(iscsi_transport_init); | |
2195 | module_exit(iscsi_transport_exit); | |
2196 | ||
0896b752 AA |
2197 | MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, " |
2198 | "Dmitry Yusupov <dmitry_yus@yahoo.com>, " | |
2199 | "Alex Aizman <itn780@yahoo.com>"); | |
2200 | MODULE_DESCRIPTION("iSCSI Transport Interface"); | |
1da177e4 | 2201 | MODULE_LICENSE("GPL"); |
f4246b33 | 2202 | MODULE_VERSION(ISCSI_TRANSPORT_VERSION); |