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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 | |
0896b752 AA |
34 | #define ISCSI_SESSION_ATTRS 8 |
35 | #define ISCSI_CONN_ATTRS 6 | |
1da177e4 LT |
36 | |
37 | struct iscsi_internal { | |
38 | struct scsi_transport_template t; | |
0896b752 AA |
39 | struct iscsi_transport *iscsi_transport; |
40 | struct list_head list; | |
41 | /* | |
42 | * List of sessions for this transport | |
43 | */ | |
44 | struct list_head sessions; | |
0896b752 AA |
45 | /* |
46 | * based on transport capabilities, at register time we set these | |
47 | * bits to tell the transport class it wants attributes displayed | |
48 | * in sysfs or that it can support different iSCSI Data-Path | |
49 | * capabilities | |
50 | */ | |
51 | uint32_t param_mask; | |
52 | ||
53 | struct class_device cdev; | |
1da177e4 LT |
54 | /* |
55 | * We do not have any private or other attrs. | |
56 | */ | |
0896b752 AA |
57 | struct transport_container conn_cont; |
58 | struct class_device_attribute *conn_attrs[ISCSI_CONN_ATTRS + 1]; | |
59 | struct transport_container session_cont; | |
1da177e4 | 60 | struct class_device_attribute *session_attrs[ISCSI_SESSION_ATTRS + 1]; |
1da177e4 LT |
61 | }; |
62 | ||
0896b752 AA |
63 | /* |
64 | * list of registered transports and lock that must | |
65 | * be held while accessing list. The iscsi_transport_lock must | |
0b950672 | 66 | * be acquired after the rx_queue_mutex. |
0896b752 AA |
67 | */ |
68 | static LIST_HEAD(iscsi_transports); | |
69 | static DEFINE_SPINLOCK(iscsi_transport_lock); | |
70 | ||
71 | #define to_iscsi_internal(tmpl) \ | |
72 | container_of(tmpl, struct iscsi_internal, t) | |
73 | ||
74 | #define cdev_to_iscsi_internal(_cdev) \ | |
75 | container_of(_cdev, struct iscsi_internal, cdev) | |
76 | ||
77 | static void iscsi_transport_release(struct class_device *cdev) | |
78 | { | |
79 | struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev); | |
80 | kfree(priv); | |
81 | } | |
1da177e4 | 82 | |
0896b752 AA |
83 | /* |
84 | * iscsi_transport_class represents the iscsi_transports that are | |
85 | * registered. | |
86 | */ | |
87 | static struct class iscsi_transport_class = { | |
88 | .name = "iscsi_transport", | |
89 | .release = iscsi_transport_release, | |
90 | }; | |
91 | ||
92 | static ssize_t | |
93 | show_transport_handle(struct class_device *cdev, char *buf) | |
94 | { | |
95 | struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev); | |
762e2bfa | 96 | return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport)); |
0896b752 AA |
97 | } |
98 | static CLASS_DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL); | |
99 | ||
100 | #define show_transport_attr(name, format) \ | |
101 | static ssize_t \ | |
102 | show_transport_##name(struct class_device *cdev, char *buf) \ | |
103 | { \ | |
104 | struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev); \ | |
105 | return sprintf(buf, format"\n", priv->iscsi_transport->name); \ | |
106 | } \ | |
107 | static CLASS_DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL); | |
108 | ||
109 | show_transport_attr(caps, "0x%x"); | |
110 | show_transport_attr(max_lun, "%d"); | |
111 | show_transport_attr(max_conn, "%d"); | |
112 | show_transport_attr(max_cmd_len, "%d"); | |
113 | ||
114 | static struct attribute *iscsi_transport_attrs[] = { | |
115 | &class_device_attr_handle.attr, | |
116 | &class_device_attr_caps.attr, | |
117 | &class_device_attr_max_lun.attr, | |
118 | &class_device_attr_max_conn.attr, | |
119 | &class_device_attr_max_cmd_len.attr, | |
120 | NULL, | |
121 | }; | |
122 | ||
123 | static struct attribute_group iscsi_transport_group = { | |
124 | .attrs = iscsi_transport_attrs, | |
125 | }; | |
126 | ||
127 | static DECLARE_TRANSPORT_CLASS(iscsi_session_class, | |
128 | "iscsi_session", | |
1da177e4 LT |
129 | NULL, |
130 | NULL, | |
131 | NULL); | |
132 | ||
0896b752 AA |
133 | static DECLARE_TRANSPORT_CLASS(iscsi_connection_class, |
134 | "iscsi_connection", | |
1da177e4 LT |
135 | NULL, |
136 | NULL, | |
137 | NULL); | |
0896b752 AA |
138 | |
139 | static struct sock *nls; | |
140 | static int daemon_pid; | |
0b950672 | 141 | static DEFINE_MUTEX(rx_queue_mutex); |
0896b752 AA |
142 | |
143 | struct mempool_zone { | |
144 | mempool_t *pool; | |
145 | atomic_t allocated; | |
146 | int size; | |
147 | int hiwat; | |
148 | struct list_head freequeue; | |
149 | spinlock_t freelock; | |
150 | }; | |
151 | ||
7b8631b5 | 152 | static struct mempool_zone *z_reply; |
0896b752 | 153 | |
1da177e4 | 154 | /* |
0896b752 AA |
155 | * Z_MAX_* - actual mempool size allocated at the mempool_zone_init() time |
156 | * Z_HIWAT_* - zone's high watermark when if_error bit will be set to -ENOMEM | |
157 | * so daemon will notice OOM on NETLINK tranposrt level and will | |
158 | * be able to predict or change operational behavior | |
1da177e4 | 159 | */ |
0896b752 AA |
160 | #define Z_MAX_REPLY 8 |
161 | #define Z_HIWAT_REPLY 6 | |
162 | #define Z_MAX_PDU 8 | |
163 | #define Z_HIWAT_PDU 6 | |
164 | #define Z_MAX_ERROR 16 | |
165 | #define Z_HIWAT_ERROR 12 | |
166 | ||
7b8631b5 MC |
167 | static LIST_HEAD(connlist); |
168 | static DEFINE_SPINLOCK(connlock); | |
0896b752 | 169 | |
7b8631b5 MC |
170 | /* |
171 | * The following functions can be used by LLDs that allocate | |
172 | * their own scsi_hosts or by software iscsi LLDs | |
173 | */ | |
174 | static void iscsi_session_release(struct device *dev) | |
175 | { | |
176 | struct iscsi_cls_session *session = iscsi_dev_to_session(dev); | |
177 | struct iscsi_transport *transport = session->transport; | |
178 | struct Scsi_Host *shost; | |
0896b752 | 179 | |
7b8631b5 MC |
180 | shost = iscsi_session_to_shost(session); |
181 | scsi_host_put(shost); | |
182 | kfree(session); | |
183 | module_put(transport->owner); | |
184 | } | |
0896b752 | 185 | |
7b8631b5 MC |
186 | static int iscsi_is_session_dev(const struct device *dev) |
187 | { | |
188 | return dev->release == iscsi_session_release; | |
189 | } | |
0896b752 | 190 | |
7b8631b5 MC |
191 | /** |
192 | * iscsi_create_session - create iscsi class session | |
193 | * @shost: scsi host | |
194 | * @transport: iscsi transport | |
195 | * | |
196 | * This can be called from a LLD or iscsi_transport | |
197 | **/ | |
198 | struct iscsi_cls_session * | |
199 | iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport) | |
200 | { | |
201 | struct iscsi_cls_session *session; | |
202 | int err; | |
203 | ||
204 | if (!try_module_get(transport->owner)) | |
205 | return NULL; | |
206 | ||
207 | session = kzalloc(sizeof(*session), GFP_KERNEL); | |
208 | if (!session) | |
209 | goto module_put; | |
210 | session->transport = transport; | |
211 | ||
212 | /* this is released in the dev's release function */ | |
213 | scsi_host_get(shost); | |
214 | snprintf(session->dev.bus_id, BUS_ID_SIZE, "session%u", shost->host_no); | |
215 | session->dev.parent = &shost->shost_gendev; | |
216 | session->dev.release = iscsi_session_release; | |
217 | err = device_register(&session->dev); | |
218 | if (err) { | |
219 | dev_printk(KERN_ERR, &session->dev, "iscsi: could not " | |
220 | "register session's dev\n"); | |
221 | goto free_session; | |
222 | } | |
223 | transport_register_device(&session->dev); | |
224 | ||
225 | return session; | |
226 | ||
227 | free_session: | |
228 | kfree(session); | |
229 | module_put: | |
230 | module_put(transport->owner); | |
231 | return NULL; | |
232 | } | |
233 | ||
234 | EXPORT_SYMBOL_GPL(iscsi_create_session); | |
235 | ||
236 | /** | |
237 | * iscsi_destroy_session - destroy iscsi session | |
238 | * @session: iscsi_session | |
239 | * | |
240 | * Can be called by a LLD or iscsi_transport. There must not be | |
241 | * any running connections. | |
242 | **/ | |
243 | int iscsi_destroy_session(struct iscsi_cls_session *session) | |
244 | { | |
245 | transport_unregister_device(&session->dev); | |
246 | device_unregister(&session->dev); | |
247 | return 0; | |
248 | } | |
249 | ||
250 | EXPORT_SYMBOL_GPL(iscsi_destroy_session); | |
251 | ||
252 | static void iscsi_conn_release(struct device *dev) | |
253 | { | |
254 | struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev); | |
255 | struct device *parent = conn->dev.parent; | |
256 | ||
257 | kfree(conn); | |
258 | put_device(parent); | |
259 | } | |
260 | ||
261 | static int iscsi_is_conn_dev(const struct device *dev) | |
262 | { | |
263 | return dev->release == iscsi_conn_release; | |
264 | } | |
265 | ||
266 | /** | |
267 | * iscsi_create_conn - create iscsi class connection | |
268 | * @session: iscsi cls session | |
269 | * @cid: connection id | |
270 | * | |
271 | * This can be called from a LLD or iscsi_transport. The connection | |
272 | * is child of the session so cid must be unique for all connections | |
273 | * on the session. | |
274 | **/ | |
275 | struct iscsi_cls_conn * | |
276 | iscsi_create_conn(struct iscsi_cls_session *session, uint32_t cid) | |
277 | { | |
278 | struct iscsi_transport *transport = session->transport; | |
279 | struct Scsi_Host *shost = iscsi_session_to_shost(session); | |
280 | struct iscsi_cls_conn *conn; | |
281 | int err; | |
282 | ||
283 | conn = kzalloc(sizeof(*conn) + transport->conndata_size, GFP_KERNEL); | |
284 | if (!conn) | |
285 | return NULL; | |
286 | ||
287 | if (transport->conndata_size) | |
288 | conn->dd_data = &conn[1]; | |
289 | ||
290 | INIT_LIST_HEAD(&conn->conn_list); | |
291 | conn->transport = transport; | |
292 | ||
293 | /* this is released in the dev's release function */ | |
294 | if (!get_device(&session->dev)) | |
295 | goto free_conn; | |
296 | snprintf(conn->dev.bus_id, BUS_ID_SIZE, "connection%d:%u", | |
297 | shost->host_no, cid); | |
298 | conn->dev.parent = &session->dev; | |
299 | conn->dev.release = iscsi_conn_release; | |
300 | err = device_register(&conn->dev); | |
301 | if (err) { | |
302 | dev_printk(KERN_ERR, &conn->dev, "iscsi: could not register " | |
303 | "connection's dev\n"); | |
304 | goto release_parent_ref; | |
305 | } | |
306 | transport_register_device(&conn->dev); | |
307 | return conn; | |
308 | ||
309 | release_parent_ref: | |
310 | put_device(&session->dev); | |
311 | free_conn: | |
312 | kfree(conn); | |
313 | return NULL; | |
314 | } | |
315 | ||
316 | EXPORT_SYMBOL_GPL(iscsi_create_conn); | |
317 | ||
318 | /** | |
319 | * iscsi_destroy_conn - destroy iscsi class connection | |
320 | * @session: iscsi cls session | |
321 | * | |
322 | * This can be called from a LLD or iscsi_transport. | |
323 | **/ | |
324 | int iscsi_destroy_conn(struct iscsi_cls_conn *conn) | |
325 | { | |
326 | transport_unregister_device(&conn->dev); | |
327 | device_unregister(&conn->dev); | |
328 | return 0; | |
329 | } | |
330 | ||
331 | EXPORT_SYMBOL_GPL(iscsi_destroy_conn); | |
332 | ||
333 | /* | |
334 | * These functions are used only by software iscsi_transports | |
335 | * which do not allocate and more their scsi_hosts since this | |
336 | * is initiated from userspace. | |
337 | */ | |
338 | ||
339 | /* | |
340 | * iSCSI Session's hostdata organization: | |
341 | * | |
342 | * *------------------* <== hostdata_session(host->hostdata) | |
343 | * | ptr to class sess| | |
344 | * |------------------| <== iscsi_hostdata(host->hostdata) | |
345 | * | transport's data | | |
346 | * *------------------* | |
347 | */ | |
348 | ||
349 | #define hostdata_privsize(_t) (sizeof(unsigned long) + _t->hostdata_size + \ | |
350 | _t->hostdata_size % sizeof(unsigned long)) | |
351 | ||
352 | #define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata)) | |
353 | ||
354 | /** | |
355 | * iscsi_transport_create_session - create iscsi cls session and host | |
356 | * scsit: scsi transport template | |
357 | * transport: iscsi transport template | |
358 | * | |
359 | * This can be used by software iscsi_transports that allocate | |
360 | * a session per scsi host. | |
361 | **/ | |
362 | struct Scsi_Host * | |
363 | iscsi_transport_create_session(struct scsi_transport_template *scsit, | |
364 | struct iscsi_transport *transport) | |
365 | { | |
366 | struct iscsi_cls_session *session; | |
367 | struct Scsi_Host *shost; | |
368 | ||
369 | shost = scsi_host_alloc(transport->host_template, | |
370 | hostdata_privsize(transport)); | |
371 | if (!shost) { | |
372 | printk(KERN_ERR "iscsi: can not allocate SCSI host for " | |
373 | "session\n"); | |
374 | return NULL; | |
375 | } | |
376 | ||
377 | shost->max_id = 1; | |
378 | shost->max_channel = 0; | |
379 | shost->max_lun = transport->max_lun; | |
380 | shost->max_cmd_len = transport->max_cmd_len; | |
381 | shost->transportt = scsit; | |
55e3299d | 382 | shost->transportt->create_work_queue = 1; |
7b8631b5 MC |
383 | |
384 | if (scsi_add_host(shost, NULL)) | |
385 | goto free_host; | |
386 | ||
387 | session = iscsi_create_session(shost, transport); | |
388 | if (!session) | |
389 | goto remove_host; | |
0896b752 | 390 | |
7b8631b5 MC |
391 | *(unsigned long*)shost->hostdata = (unsigned long)session; |
392 | return shost; | |
393 | ||
394 | remove_host: | |
395 | scsi_remove_host(shost); | |
396 | free_host: | |
397 | scsi_host_put(shost); | |
398 | return NULL; | |
399 | } | |
0896b752 | 400 | |
7b8631b5 | 401 | EXPORT_SYMBOL_GPL(iscsi_transport_create_session); |
0896b752 | 402 | |
7b8631b5 MC |
403 | /** |
404 | * iscsi_transport_destroy_session - destroy session and scsi host | |
405 | * shost: scsi host | |
406 | * | |
407 | * This can be used by software iscsi_transports that allocate | |
408 | * a session per scsi host. | |
409 | **/ | |
410 | int iscsi_transport_destroy_session(struct Scsi_Host *shost) | |
411 | { | |
412 | struct iscsi_cls_session *session; | |
0896b752 | 413 | |
7b8631b5 MC |
414 | scsi_remove_host(shost); |
415 | session = hostdata_session(shost->hostdata); | |
416 | iscsi_destroy_session(session); | |
417 | /* ref from host alloc */ | |
418 | scsi_host_put(shost); | |
419 | return 0; | |
420 | } | |
421 | ||
422 | EXPORT_SYMBOL_GPL(iscsi_transport_destroy_session); | |
423 | ||
424 | /* | |
425 | * iscsi interface functions | |
426 | */ | |
427 | static struct iscsi_cls_conn* | |
0896b752 AA |
428 | iscsi_if_find_conn(uint64_t key) |
429 | { | |
430 | unsigned long flags; | |
7b8631b5 | 431 | struct iscsi_cls_conn *conn; |
0896b752 AA |
432 | |
433 | spin_lock_irqsave(&connlock, flags); | |
434 | list_for_each_entry(conn, &connlist, conn_list) | |
435 | if (conn->connh == key) { | |
436 | spin_unlock_irqrestore(&connlock, flags); | |
437 | return conn; | |
438 | } | |
439 | spin_unlock_irqrestore(&connlock, flags); | |
440 | return NULL; | |
1da177e4 LT |
441 | } |
442 | ||
0896b752 AA |
443 | static struct iscsi_internal * |
444 | iscsi_if_transport_lookup(struct iscsi_transport *tt) | |
445 | { | |
446 | struct iscsi_internal *priv; | |
447 | unsigned long flags; | |
448 | ||
449 | spin_lock_irqsave(&iscsi_transport_lock, flags); | |
450 | list_for_each_entry(priv, &iscsi_transports, list) { | |
451 | if (tt == priv->iscsi_transport) { | |
452 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
453 | return priv; | |
454 | } | |
455 | } | |
456 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
457 | return NULL; | |
458 | } | |
1da177e4 | 459 | |
0896b752 AA |
460 | static inline struct list_head *skb_to_lh(struct sk_buff *skb) |
461 | { | |
462 | return (struct list_head *)&skb->cb; | |
463 | } | |
1da177e4 | 464 | |
0896b752 | 465 | static void* |
7b8631b5 | 466 | mempool_zone_alloc_skb(unsigned int gfp_mask, void *pool_data) |
0896b752 AA |
467 | { |
468 | struct mempool_zone *zone = pool_data; | |
1da177e4 | 469 | |
0896b752 | 470 | return alloc_skb(zone->size, gfp_mask); |
1da177e4 LT |
471 | } |
472 | ||
0896b752 AA |
473 | static void |
474 | mempool_zone_free_skb(void *element, void *pool_data) | |
475 | { | |
476 | kfree_skb(element); | |
477 | } | |
1da177e4 | 478 | |
0896b752 AA |
479 | static void |
480 | mempool_zone_complete(struct mempool_zone *zone) | |
481 | { | |
482 | unsigned long flags; | |
483 | struct list_head *lh, *n; | |
1da177e4 | 484 | |
0896b752 AA |
485 | spin_lock_irqsave(&zone->freelock, flags); |
486 | list_for_each_safe(lh, n, &zone->freequeue) { | |
487 | struct sk_buff *skb = (struct sk_buff *)((char *)lh - | |
488 | offsetof(struct sk_buff, cb)); | |
489 | if (!skb_shared(skb)) { | |
490 | list_del(skb_to_lh(skb)); | |
491 | mempool_free(skb, zone->pool); | |
492 | atomic_dec(&zone->allocated); | |
493 | } | |
494 | } | |
495 | spin_unlock_irqrestore(&zone->freelock, flags); | |
1da177e4 LT |
496 | } |
497 | ||
7b8631b5 MC |
498 | static struct mempool_zone * |
499 | mempool_zone_init(unsigned max, unsigned size, unsigned hiwat) | |
0896b752 | 500 | { |
7b8631b5 MC |
501 | struct mempool_zone *zp; |
502 | ||
503 | zp = kzalloc(sizeof(*zp), GFP_KERNEL); | |
504 | if (!zp) | |
505 | return NULL; | |
506 | ||
0896b752 AA |
507 | zp->pool = mempool_create(max, mempool_zone_alloc_skb, |
508 | mempool_zone_free_skb, zp); | |
7b8631b5 MC |
509 | if (!zp->pool) { |
510 | kfree(zp); | |
511 | return NULL; | |
512 | } | |
1da177e4 | 513 | |
0896b752 AA |
514 | zp->size = size; |
515 | zp->hiwat = hiwat; | |
1da177e4 | 516 | |
0896b752 AA |
517 | INIT_LIST_HEAD(&zp->freequeue); |
518 | spin_lock_init(&zp->freelock); | |
519 | atomic_set(&zp->allocated, 0); | |
520 | ||
7b8631b5 | 521 | return zp; |
0896b752 AA |
522 | } |
523 | ||
7b8631b5 MC |
524 | static void mempool_zone_destroy(struct mempool_zone *zp) |
525 | { | |
526 | mempool_destroy(zp->pool); | |
527 | kfree(zp); | |
528 | } | |
0896b752 AA |
529 | |
530 | static struct sk_buff* | |
531 | mempool_zone_get_skb(struct mempool_zone *zone) | |
1da177e4 | 532 | { |
0896b752 AA |
533 | struct sk_buff *skb; |
534 | ||
535 | skb = mempool_alloc(zone->pool, GFP_ATOMIC); | |
536 | if (skb) | |
537 | atomic_inc(&zone->allocated); | |
538 | return skb; | |
539 | } | |
1da177e4 | 540 | |
0896b752 AA |
541 | static int |
542 | iscsi_unicast_skb(struct mempool_zone *zone, struct sk_buff *skb) | |
543 | { | |
544 | unsigned long flags; | |
545 | int rc; | |
1da177e4 | 546 | |
0896b752 AA |
547 | skb_get(skb); |
548 | rc = netlink_unicast(nls, skb, daemon_pid, MSG_DONTWAIT); | |
549 | if (rc < 0) { | |
550 | mempool_free(skb, zone->pool); | |
551 | printk(KERN_ERR "iscsi: can not unicast skb (%d)\n", rc); | |
552 | return rc; | |
553 | } | |
554 | ||
555 | spin_lock_irqsave(&zone->freelock, flags); | |
556 | list_add(skb_to_lh(skb), &zone->freequeue); | |
557 | spin_unlock_irqrestore(&zone->freelock, flags); | |
558 | ||
559 | return 0; | |
1da177e4 | 560 | } |
1da177e4 | 561 | |
0896b752 AA |
562 | int iscsi_recv_pdu(iscsi_connh_t connh, struct iscsi_hdr *hdr, |
563 | char *data, uint32_t data_size) | |
1da177e4 | 564 | { |
0896b752 AA |
565 | struct nlmsghdr *nlh; |
566 | struct sk_buff *skb; | |
567 | struct iscsi_uevent *ev; | |
7b8631b5 | 568 | struct iscsi_cls_conn *conn; |
0896b752 AA |
569 | char *pdu; |
570 | int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) + | |
571 | data_size); | |
572 | ||
573 | conn = iscsi_if_find_conn(connh); | |
574 | BUG_ON(!conn); | |
575 | ||
7b8631b5 | 576 | mempool_zone_complete(conn->z_pdu); |
0896b752 | 577 | |
7b8631b5 | 578 | skb = mempool_zone_get_skb(conn->z_pdu); |
0896b752 AA |
579 | if (!skb) { |
580 | iscsi_conn_error(connh, ISCSI_ERR_CONN_FAILED); | |
7b8631b5 MC |
581 | dev_printk(KERN_ERR, &conn->dev, "iscsi: can not deliver " |
582 | "control PDU: OOM\n"); | |
0896b752 AA |
583 | return -ENOMEM; |
584 | } | |
1da177e4 | 585 | |
0896b752 AA |
586 | nlh = __nlmsg_put(skb, daemon_pid, 0, 0, (len - sizeof(*nlh)), 0); |
587 | ev = NLMSG_DATA(nlh); | |
588 | memset(ev, 0, sizeof(*ev)); | |
589 | ev->transport_handle = iscsi_handle(conn->transport); | |
590 | ev->type = ISCSI_KEVENT_RECV_PDU; | |
7b8631b5 | 591 | if (atomic_read(&conn->z_pdu->allocated) >= conn->z_pdu->hiwat) |
0896b752 AA |
592 | ev->iferror = -ENOMEM; |
593 | ev->r.recv_req.conn_handle = connh; | |
594 | pdu = (char*)ev + sizeof(*ev); | |
595 | memcpy(pdu, hdr, sizeof(struct iscsi_hdr)); | |
596 | memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size); | |
1da177e4 | 597 | |
7b8631b5 | 598 | return iscsi_unicast_skb(conn->z_pdu, skb); |
1da177e4 | 599 | } |
0896b752 | 600 | EXPORT_SYMBOL_GPL(iscsi_recv_pdu); |
1da177e4 | 601 | |
0896b752 | 602 | void iscsi_conn_error(iscsi_connh_t connh, enum iscsi_err error) |
1da177e4 | 603 | { |
0896b752 AA |
604 | struct nlmsghdr *nlh; |
605 | struct sk_buff *skb; | |
606 | struct iscsi_uevent *ev; | |
7b8631b5 | 607 | struct iscsi_cls_conn *conn; |
0896b752 AA |
608 | int len = NLMSG_SPACE(sizeof(*ev)); |
609 | ||
610 | conn = iscsi_if_find_conn(connh); | |
611 | BUG_ON(!conn); | |
612 | ||
7b8631b5 | 613 | mempool_zone_complete(conn->z_error); |
0896b752 | 614 | |
7b8631b5 | 615 | skb = mempool_zone_get_skb(conn->z_error); |
0896b752 | 616 | if (!skb) { |
7b8631b5 MC |
617 | dev_printk(KERN_ERR, &conn->dev, "iscsi: gracefully ignored " |
618 | "conn error (%d)\n", error); | |
0896b752 AA |
619 | return; |
620 | } | |
621 | ||
622 | nlh = __nlmsg_put(skb, daemon_pid, 0, 0, (len - sizeof(*nlh)), 0); | |
623 | ev = NLMSG_DATA(nlh); | |
624 | ev->transport_handle = iscsi_handle(conn->transport); | |
625 | ev->type = ISCSI_KEVENT_CONN_ERROR; | |
7b8631b5 | 626 | if (atomic_read(&conn->z_error->allocated) >= conn->z_error->hiwat) |
0896b752 AA |
627 | ev->iferror = -ENOMEM; |
628 | ev->r.connerror.error = error; | |
629 | ev->r.connerror.conn_handle = connh; | |
1da177e4 | 630 | |
7b8631b5 | 631 | iscsi_unicast_skb(conn->z_error, skb); |
1da177e4 | 632 | |
7b8631b5 MC |
633 | dev_printk(KERN_INFO, &conn->dev, "iscsi: detected conn error (%d)\n", |
634 | error); | |
0896b752 AA |
635 | } |
636 | EXPORT_SYMBOL_GPL(iscsi_conn_error); | |
637 | ||
638 | static int | |
639 | iscsi_if_send_reply(int pid, int seq, int type, int done, int multi, | |
640 | void *payload, int size) | |
641 | { | |
642 | struct sk_buff *skb; | |
643 | struct nlmsghdr *nlh; | |
644 | int len = NLMSG_SPACE(size); | |
645 | int flags = multi ? NLM_F_MULTI : 0; | |
646 | int t = done ? NLMSG_DONE : type; | |
647 | ||
7b8631b5 | 648 | mempool_zone_complete(z_reply); |
0896b752 | 649 | |
7b8631b5 | 650 | skb = mempool_zone_get_skb(z_reply); |
0896b752 AA |
651 | /* |
652 | * FIXME: | |
653 | * user is supposed to react on iferror == -ENOMEM; | |
654 | * see iscsi_if_rx(). | |
655 | */ | |
656 | BUG_ON(!skb); | |
657 | ||
658 | nlh = __nlmsg_put(skb, pid, seq, t, (len - sizeof(*nlh)), 0); | |
659 | nlh->nlmsg_flags = flags; | |
660 | memcpy(NLMSG_DATA(nlh), payload, size); | |
7b8631b5 | 661 | return iscsi_unicast_skb(z_reply, skb); |
1da177e4 | 662 | } |
1da177e4 | 663 | |
7b8631b5 MC |
664 | static int |
665 | iscsi_if_get_stats(struct iscsi_transport *transport, struct sk_buff *skb, | |
666 | struct nlmsghdr *nlh) | |
667 | { | |
668 | struct iscsi_uevent *ev = NLMSG_DATA(nlh); | |
669 | struct iscsi_stats *stats; | |
670 | struct sk_buff *skbstat; | |
671 | struct iscsi_cls_conn *conn; | |
672 | struct nlmsghdr *nlhstat; | |
673 | struct iscsi_uevent *evstat; | |
674 | int len = NLMSG_SPACE(sizeof(*ev) + | |
675 | sizeof(struct iscsi_stats) + | |
676 | sizeof(struct iscsi_stats_custom) * | |
677 | ISCSI_STATS_CUSTOM_MAX); | |
678 | int err = 0; | |
0896b752 | 679 | |
7b8631b5 MC |
680 | conn = iscsi_if_find_conn(ev->u.get_stats.conn_handle); |
681 | if (!conn) | |
682 | return -EEXIST; | |
0896b752 | 683 | |
7b8631b5 MC |
684 | do { |
685 | int actual_size; | |
0896b752 | 686 | |
7b8631b5 | 687 | mempool_zone_complete(conn->z_pdu); |
0896b752 | 688 | |
7b8631b5 MC |
689 | skbstat = mempool_zone_get_skb(conn->z_pdu); |
690 | if (!skbstat) { | |
691 | dev_printk(KERN_ERR, &conn->dev, "iscsi: can not " | |
692 | "deliver stats: OOM\n"); | |
693 | return -ENOMEM; | |
694 | } | |
695 | ||
696 | nlhstat = __nlmsg_put(skbstat, daemon_pid, 0, 0, | |
697 | (len - sizeof(*nlhstat)), 0); | |
698 | evstat = NLMSG_DATA(nlhstat); | |
699 | memset(evstat, 0, sizeof(*evstat)); | |
700 | evstat->transport_handle = iscsi_handle(conn->transport); | |
701 | evstat->type = nlh->nlmsg_type; | |
702 | if (atomic_read(&conn->z_pdu->allocated) >= conn->z_pdu->hiwat) | |
703 | evstat->iferror = -ENOMEM; | |
704 | evstat->u.get_stats.conn_handle = | |
705 | ev->u.get_stats.conn_handle; | |
706 | stats = (struct iscsi_stats *) | |
707 | ((char*)evstat + sizeof(*evstat)); | |
708 | memset(stats, 0, sizeof(*stats)); | |
709 | ||
710 | transport->get_stats(ev->u.get_stats.conn_handle, stats); | |
711 | actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) + | |
712 | sizeof(struct iscsi_stats) + | |
713 | sizeof(struct iscsi_stats_custom) * | |
714 | stats->custom_length); | |
715 | actual_size -= sizeof(*nlhstat); | |
716 | actual_size = NLMSG_LENGTH(actual_size); | |
717 | skb_trim(skb, NLMSG_ALIGN(actual_size)); | |
718 | nlhstat->nlmsg_len = actual_size; | |
719 | ||
720 | err = iscsi_unicast_skb(conn->z_pdu, skbstat); | |
721 | } while (err < 0 && err != -ECONNREFUSED); | |
722 | ||
723 | return err; | |
0896b752 AA |
724 | } |
725 | ||
726 | static int | |
727 | iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_uevent *ev) | |
728 | { | |
729 | struct iscsi_transport *transport = priv->iscsi_transport; | |
0896b752 | 730 | struct Scsi_Host *shost; |
0896b752 | 731 | |
7b8631b5 MC |
732 | if (!transport->create_session) |
733 | return -EINVAL; | |
0896b752 | 734 | |
7b8631b5 MC |
735 | shost = transport->create_session(&priv->t, |
736 | ev->u.c_session.initial_cmdsn); | |
737 | if (!shost) | |
738 | return -ENOMEM; | |
0896b752 | 739 | |
7b8631b5 | 740 | ev->r.c_session_ret.session_handle = iscsi_handle(iscsi_hostdata(shost->hostdata)); |
0896b752 | 741 | ev->r.c_session_ret.sid = shost->host_no; |
0896b752 | 742 | return 0; |
0896b752 AA |
743 | } |
744 | ||
745 | static int | |
746 | iscsi_if_destroy_session(struct iscsi_internal *priv, struct iscsi_uevent *ev) | |
747 | { | |
748 | struct iscsi_transport *transport = priv->iscsi_transport; | |
7b8631b5 | 749 | |
0896b752 | 750 | struct Scsi_Host *shost; |
7b8631b5 MC |
751 | |
752 | if (!transport->destroy_session) | |
753 | return -EINVAL; | |
0896b752 AA |
754 | |
755 | shost = scsi_host_lookup(ev->u.d_session.sid); | |
756 | if (shost == ERR_PTR(-ENXIO)) | |
757 | return -EEXIST; | |
0896b752 | 758 | |
7b8631b5 MC |
759 | if (transport->destroy_session) |
760 | transport->destroy_session(shost); | |
761 | /* ref from host lookup */ | |
762 | scsi_host_put(shost); | |
763 | return 0; | |
0896b752 AA |
764 | } |
765 | ||
766 | static int | |
7b8631b5 | 767 | iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev){ |
0896b752 | 768 | struct Scsi_Host *shost; |
7b8631b5 | 769 | struct iscsi_cls_conn *conn; |
0896b752 | 770 | unsigned long flags; |
7b8631b5 MC |
771 | |
772 | if (!transport->create_conn) | |
773 | return -EINVAL; | |
0896b752 AA |
774 | |
775 | shost = scsi_host_lookup(ev->u.c_conn.sid); | |
776 | if (shost == ERR_PTR(-ENXIO)) | |
777 | return -EEXIST; | |
0896b752 | 778 | |
7b8631b5 MC |
779 | conn = transport->create_conn(shost, ev->u.c_conn.cid); |
780 | if (!conn) | |
781 | goto release_ref; | |
0896b752 | 782 | |
7b8631b5 | 783 | conn->z_pdu = mempool_zone_init(Z_MAX_PDU, |
0896b752 AA |
784 | NLMSG_SPACE(sizeof(struct iscsi_uevent) + |
785 | sizeof(struct iscsi_hdr) + | |
786 | DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH), | |
787 | Z_HIWAT_PDU); | |
7b8631b5 MC |
788 | if (!conn->z_pdu) { |
789 | dev_printk(KERN_ERR, &conn->dev, "iscsi: can not allocate " | |
790 | "pdu zone for new conn\n"); | |
791 | goto destroy_conn; | |
0896b752 | 792 | } |
7b8631b5 MC |
793 | |
794 | conn->z_error = mempool_zone_init(Z_MAX_ERROR, | |
0896b752 AA |
795 | NLMSG_SPACE(sizeof(struct iscsi_uevent)), |
796 | Z_HIWAT_ERROR); | |
7b8631b5 MC |
797 | if (!conn->z_error) { |
798 | dev_printk(KERN_ERR, &conn->dev, "iscsi: can not allocate " | |
799 | "error zone for new conn\n"); | |
800 | goto free_pdu_pool; | |
0896b752 AA |
801 | } |
802 | ||
7b8631b5 | 803 | ev->r.handle = conn->connh = iscsi_handle(conn->dd_data); |
0896b752 AA |
804 | |
805 | spin_lock_irqsave(&connlock, flags); | |
806 | list_add(&conn->conn_list, &connlist); | |
0896b752 AA |
807 | conn->active = 1; |
808 | spin_unlock_irqrestore(&connlock, flags); | |
809 | ||
810 | scsi_host_put(shost); | |
811 | return 0; | |
812 | ||
7b8631b5 MC |
813 | free_pdu_pool: |
814 | mempool_zone_destroy(conn->z_pdu); | |
815 | destroy_conn: | |
816 | if (transport->destroy_conn) | |
817 | transport->destroy_conn(conn->dd_data); | |
818 | release_ref: | |
0896b752 | 819 | scsi_host_put(shost); |
7b8631b5 | 820 | return -ENOMEM; |
1da177e4 LT |
821 | } |
822 | ||
0896b752 AA |
823 | static int |
824 | iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev) | |
825 | { | |
826 | unsigned long flags; | |
7b8631b5 MC |
827 | struct iscsi_cls_conn *conn; |
828 | struct mempool_zone *z_error, *z_pdu; | |
0896b752 AA |
829 | |
830 | conn = iscsi_if_find_conn(ev->u.d_conn.conn_handle); | |
831 | if (!conn) | |
832 | return -EEXIST; | |
833 | ||
7b8631b5 MC |
834 | if (!transport->destroy_conn) |
835 | return -EINVAL; | |
0896b752 AA |
836 | |
837 | spin_lock_irqsave(&connlock, flags); | |
838 | conn->active = 0; | |
839 | list_del(&conn->conn_list); | |
840 | spin_unlock_irqrestore(&connlock, flags); | |
841 | ||
7b8631b5 MC |
842 | z_pdu = conn->z_pdu; |
843 | z_error = conn->z_error; | |
0896b752 | 844 | |
7b8631b5 MC |
845 | if (transport->destroy_conn) |
846 | transport->destroy_conn(conn); | |
0896b752 | 847 | |
7b8631b5 MC |
848 | mempool_zone_destroy(z_pdu); |
849 | mempool_zone_destroy(z_error); | |
0896b752 | 850 | |
7b8631b5 | 851 | return 0; |
0896b752 AA |
852 | } |
853 | ||
854 | static int | |
855 | iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) | |
856 | { | |
857 | int err = 0; | |
858 | struct iscsi_uevent *ev = NLMSG_DATA(nlh); | |
859 | struct iscsi_transport *transport = NULL; | |
860 | struct iscsi_internal *priv; | |
861 | ||
862 | if (NETLINK_CREDS(skb)->uid) | |
863 | return -EPERM; | |
864 | ||
865 | priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle)); | |
866 | if (!priv) | |
867 | return -EINVAL; | |
868 | transport = priv->iscsi_transport; | |
869 | ||
870 | daemon_pid = NETLINK_CREDS(skb)->pid; | |
871 | ||
872 | switch (nlh->nlmsg_type) { | |
873 | case ISCSI_UEVENT_CREATE_SESSION: | |
874 | err = iscsi_if_create_session(priv, ev); | |
875 | break; | |
876 | case ISCSI_UEVENT_DESTROY_SESSION: | |
877 | err = iscsi_if_destroy_session(priv, ev); | |
878 | break; | |
879 | case ISCSI_UEVENT_CREATE_CONN: | |
880 | err = iscsi_if_create_conn(transport, ev); | |
881 | break; | |
882 | case ISCSI_UEVENT_DESTROY_CONN: | |
883 | err = iscsi_if_destroy_conn(transport, ev); | |
884 | break; | |
885 | case ISCSI_UEVENT_BIND_CONN: | |
886 | if (!iscsi_if_find_conn(ev->u.b_conn.conn_handle)) | |
887 | return -EEXIST; | |
888 | ev->r.retcode = transport->bind_conn( | |
889 | ev->u.b_conn.session_handle, | |
890 | ev->u.b_conn.conn_handle, | |
891 | ev->u.b_conn.transport_fd, | |
892 | ev->u.b_conn.is_leading); | |
893 | break; | |
894 | case ISCSI_UEVENT_SET_PARAM: | |
895 | if (!iscsi_if_find_conn(ev->u.set_param.conn_handle)) | |
896 | return -EEXIST; | |
897 | ev->r.retcode = transport->set_param( | |
898 | ev->u.set_param.conn_handle, | |
899 | ev->u.set_param.param, ev->u.set_param.value); | |
900 | break; | |
901 | case ISCSI_UEVENT_START_CONN: | |
902 | if (!iscsi_if_find_conn(ev->u.start_conn.conn_handle)) | |
903 | return -EEXIST; | |
904 | ev->r.retcode = transport->start_conn( | |
905 | ev->u.start_conn.conn_handle); | |
906 | break; | |
907 | case ISCSI_UEVENT_STOP_CONN: | |
908 | if (!iscsi_if_find_conn(ev->u.stop_conn.conn_handle)) | |
909 | return -EEXIST; | |
910 | transport->stop_conn(ev->u.stop_conn.conn_handle, | |
911 | ev->u.stop_conn.flag); | |
912 | break; | |
913 | case ISCSI_UEVENT_SEND_PDU: | |
914 | if (!iscsi_if_find_conn(ev->u.send_pdu.conn_handle)) | |
915 | return -EEXIST; | |
916 | ev->r.retcode = transport->send_pdu( | |
917 | ev->u.send_pdu.conn_handle, | |
918 | (struct iscsi_hdr*)((char*)ev + sizeof(*ev)), | |
919 | (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size, | |
920 | ev->u.send_pdu.data_size); | |
921 | break; | |
922 | case ISCSI_UEVENT_GET_STATS: | |
923 | err = iscsi_if_get_stats(transport, skb, nlh); | |
924 | break; | |
925 | default: | |
926 | err = -EINVAL; | |
927 | break; | |
928 | } | |
929 | ||
930 | return err; | |
931 | } | |
932 | ||
933 | /* Get message from skb (based on rtnetlink_rcv_skb). Each message is | |
934 | * processed by iscsi_if_recv_msg. Malformed skbs with wrong length are | |
935 | * discarded silently. */ | |
936 | static void | |
937 | iscsi_if_rx(struct sock *sk, int len) | |
938 | { | |
939 | struct sk_buff *skb; | |
1da177e4 | 940 | |
0b950672 | 941 | mutex_lock(&rx_queue_mutex); |
0896b752 AA |
942 | while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { |
943 | while (skb->len >= NLMSG_SPACE(0)) { | |
944 | int err; | |
945 | uint32_t rlen; | |
946 | struct nlmsghdr *nlh; | |
947 | struct iscsi_uevent *ev; | |
948 | ||
949 | nlh = (struct nlmsghdr *)skb->data; | |
950 | if (nlh->nlmsg_len < sizeof(*nlh) || | |
951 | skb->len < nlh->nlmsg_len) { | |
952 | break; | |
953 | } | |
954 | ev = NLMSG_DATA(nlh); | |
955 | rlen = NLMSG_ALIGN(nlh->nlmsg_len); | |
956 | if (rlen > skb->len) | |
957 | rlen = skb->len; | |
958 | err = iscsi_if_recv_msg(skb, nlh); | |
959 | if (err) { | |
960 | ev->type = ISCSI_KEVENT_IF_ERROR; | |
961 | ev->iferror = err; | |
962 | } | |
963 | do { | |
964 | /* | |
965 | * special case for GET_STATS: | |
966 | * on success - sending reply and stats from | |
967 | * inside of if_recv_msg(), | |
968 | * on error - fall through. | |
969 | */ | |
970 | if (ev->type == ISCSI_UEVENT_GET_STATS && !err) | |
971 | break; | |
972 | err = iscsi_if_send_reply( | |
973 | NETLINK_CREDS(skb)->pid, nlh->nlmsg_seq, | |
974 | nlh->nlmsg_type, 0, 0, ev, sizeof(*ev)); | |
7b8631b5 MC |
975 | if (atomic_read(&z_reply->allocated) >= |
976 | z_reply->hiwat) | |
0896b752 AA |
977 | ev->iferror = -ENOMEM; |
978 | } while (err < 0 && err != -ECONNREFUSED); | |
979 | skb_pull(skb, rlen); | |
980 | } | |
981 | kfree_skb(skb); | |
982 | } | |
0b950672 | 983 | mutex_unlock(&rx_queue_mutex); |
0896b752 | 984 | } |
1da177e4 | 985 | |
7b8631b5 MC |
986 | #define iscsi_cdev_to_conn(_cdev) \ |
987 | iscsi_dev_to_conn(_cdev->dev) | |
988 | ||
1da177e4 | 989 | /* |
0896b752 | 990 | * iSCSI connection attrs |
1da177e4 | 991 | */ |
0896b752 AA |
992 | #define iscsi_conn_int_attr_show(param, format) \ |
993 | static ssize_t \ | |
994 | show_conn_int_param_##param(struct class_device *cdev, char *buf) \ | |
995 | { \ | |
996 | uint32_t value = 0; \ | |
7b8631b5 MC |
997 | struct iscsi_cls_conn *conn = iscsi_cdev_to_conn(cdev); \ |
998 | struct iscsi_transport *t = conn->transport; \ | |
0896b752 | 999 | \ |
7b8631b5 | 1000 | t->get_conn_param(conn->dd_data, param, &value); \ |
0896b752 AA |
1001 | return snprintf(buf, 20, format"\n", value); \ |
1002 | } | |
1003 | ||
1004 | #define iscsi_conn_int_attr(field, param, format) \ | |
1005 | iscsi_conn_int_attr_show(param, format) \ | |
1006 | static CLASS_DEVICE_ATTR(field, S_IRUGO, show_conn_int_param_##param, NULL); | |
1007 | ||
1008 | iscsi_conn_int_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH, "%u"); | |
1009 | iscsi_conn_int_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH, "%u"); | |
1010 | iscsi_conn_int_attr(header_digest, ISCSI_PARAM_HDRDGST_EN, "%d"); | |
1011 | iscsi_conn_int_attr(data_digest, ISCSI_PARAM_DATADGST_EN, "%d"); | |
1012 | iscsi_conn_int_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN, "%d"); | |
1013 | iscsi_conn_int_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN, "%d"); | |
1da177e4 | 1014 | |
7b8631b5 MC |
1015 | #define iscsi_cdev_to_session(_cdev) \ |
1016 | iscsi_dev_to_session(_cdev->dev) | |
1017 | ||
1da177e4 | 1018 | /* |
0896b752 | 1019 | * iSCSI session attrs |
1da177e4 | 1020 | */ |
0896b752 | 1021 | #define iscsi_session_int_attr_show(param, format) \ |
1da177e4 | 1022 | static ssize_t \ |
0896b752 | 1023 | show_session_int_param_##param(struct class_device *cdev, char *buf) \ |
1da177e4 | 1024 | { \ |
0896b752 | 1025 | uint32_t value = 0; \ |
7b8631b5 MC |
1026 | struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev); \ |
1027 | struct Scsi_Host *shost = iscsi_session_to_shost(session); \ | |
1028 | struct iscsi_transport *t = session->transport; \ | |
1da177e4 | 1029 | \ |
7b8631b5 | 1030 | t->get_session_param(shost, param, &value); \ |
0896b752 | 1031 | return snprintf(buf, 20, format"\n", value); \ |
1da177e4 LT |
1032 | } |
1033 | ||
0896b752 AA |
1034 | #define iscsi_session_int_attr(field, param, format) \ |
1035 | iscsi_session_int_attr_show(param, format) \ | |
1036 | static CLASS_DEVICE_ATTR(field, S_IRUGO, show_session_int_param_##param, NULL); | |
1da177e4 | 1037 | |
0896b752 AA |
1038 | iscsi_session_int_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, "%d"); |
1039 | iscsi_session_int_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, "%hu"); | |
1040 | iscsi_session_int_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, "%d"); | |
1041 | iscsi_session_int_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, "%u"); | |
1042 | iscsi_session_int_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, "%u"); | |
1043 | iscsi_session_int_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, "%d"); | |
1044 | iscsi_session_int_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, "%d"); | |
1045 | iscsi_session_int_attr(erl, ISCSI_PARAM_ERL, "%d"); | |
1da177e4 | 1046 | |
0896b752 AA |
1047 | #define SETUP_SESSION_RD_ATTR(field, param) \ |
1048 | if (priv->param_mask & (1 << param)) { \ | |
1049 | priv->session_attrs[count] = &class_device_attr_##field;\ | |
1da177e4 LT |
1050 | count++; \ |
1051 | } | |
1052 | ||
0896b752 AA |
1053 | #define SETUP_CONN_RD_ATTR(field, param) \ |
1054 | if (priv->param_mask & (1 << param)) { \ | |
1055 | priv->conn_attrs[count] = &class_device_attr_##field; \ | |
1da177e4 LT |
1056 | count++; \ |
1057 | } | |
1058 | ||
0896b752 AA |
1059 | static int iscsi_session_match(struct attribute_container *cont, |
1060 | struct device *dev) | |
1da177e4 | 1061 | { |
7b8631b5 | 1062 | struct iscsi_cls_session *session; |
1da177e4 | 1063 | struct Scsi_Host *shost; |
0896b752 AA |
1064 | struct iscsi_internal *priv; |
1065 | ||
1066 | if (!iscsi_is_session_dev(dev)) | |
1067 | return 0; | |
1da177e4 | 1068 | |
7b8631b5 MC |
1069 | session = iscsi_dev_to_session(dev); |
1070 | shost = iscsi_session_to_shost(session); | |
0896b752 | 1071 | if (!shost->transportt) |
1da177e4 LT |
1072 | return 0; |
1073 | ||
0896b752 AA |
1074 | priv = to_iscsi_internal(shost->transportt); |
1075 | if (priv->session_cont.ac.class != &iscsi_session_class.class) | |
1da177e4 LT |
1076 | return 0; |
1077 | ||
0896b752 | 1078 | return &priv->session_cont.ac == cont; |
1da177e4 LT |
1079 | } |
1080 | ||
0896b752 AA |
1081 | static int iscsi_conn_match(struct attribute_container *cont, |
1082 | struct device *dev) | |
1083 | { | |
7b8631b5 MC |
1084 | struct iscsi_cls_session *session; |
1085 | struct iscsi_cls_conn *conn; | |
1da177e4 | 1086 | struct Scsi_Host *shost; |
0896b752 | 1087 | struct iscsi_internal *priv; |
1da177e4 | 1088 | |
0896b752 | 1089 | if (!iscsi_is_conn_dev(dev)) |
1da177e4 LT |
1090 | return 0; |
1091 | ||
7b8631b5 MC |
1092 | conn = iscsi_dev_to_conn(dev); |
1093 | session = iscsi_dev_to_session(conn->dev.parent); | |
1094 | shost = iscsi_session_to_shost(session); | |
1095 | ||
0896b752 | 1096 | if (!shost->transportt) |
1da177e4 LT |
1097 | return 0; |
1098 | ||
0896b752 AA |
1099 | priv = to_iscsi_internal(shost->transportt); |
1100 | if (priv->conn_cont.ac.class != &iscsi_connection_class.class) | |
1101 | return 0; | |
1da177e4 | 1102 | |
0896b752 AA |
1103 | return &priv->conn_cont.ac == cont; |
1104 | } | |
1105 | ||
7b8631b5 MC |
1106 | struct scsi_transport_template * |
1107 | iscsi_register_transport(struct iscsi_transport *tt) | |
0896b752 AA |
1108 | { |
1109 | struct iscsi_internal *priv; | |
1110 | unsigned long flags; | |
1111 | int count = 0, err; | |
1112 | ||
1113 | BUG_ON(!tt); | |
1114 | ||
1115 | priv = iscsi_if_transport_lookup(tt); | |
1116 | if (priv) | |
7b8631b5 | 1117 | return NULL; |
0896b752 AA |
1118 | |
1119 | priv = kmalloc(sizeof(*priv), GFP_KERNEL); | |
1120 | if (!priv) | |
7b8631b5 | 1121 | return NULL; |
0896b752 AA |
1122 | memset(priv, 0, sizeof(*priv)); |
1123 | INIT_LIST_HEAD(&priv->list); | |
1124 | INIT_LIST_HEAD(&priv->sessions); | |
0896b752 AA |
1125 | priv->iscsi_transport = tt; |
1126 | ||
1127 | priv->cdev.class = &iscsi_transport_class; | |
1128 | snprintf(priv->cdev.class_id, BUS_ID_SIZE, "%s", tt->name); | |
1129 | err = class_device_register(&priv->cdev); | |
1130 | if (err) | |
1131 | goto free_priv; | |
1132 | ||
1133 | err = sysfs_create_group(&priv->cdev.kobj, &iscsi_transport_group); | |
1134 | if (err) | |
1135 | goto unregister_cdev; | |
1136 | ||
1137 | /* setup parameters mask */ | |
1138 | priv->param_mask = 0xFFFFFFFF; | |
1139 | if (!(tt->caps & CAP_MULTI_R2T)) | |
1140 | priv->param_mask &= ~(1 << ISCSI_PARAM_MAX_R2T); | |
1141 | if (!(tt->caps & CAP_HDRDGST)) | |
1142 | priv->param_mask &= ~(1 << ISCSI_PARAM_HDRDGST_EN); | |
1143 | if (!(tt->caps & CAP_DATADGST)) | |
1144 | priv->param_mask &= ~(1 << ISCSI_PARAM_DATADGST_EN); | |
1145 | if (!(tt->caps & CAP_MARKERS)) { | |
1146 | priv->param_mask &= ~(1 << ISCSI_PARAM_IFMARKER_EN); | |
1147 | priv->param_mask &= ~(1 << ISCSI_PARAM_OFMARKER_EN); | |
1148 | } | |
1da177e4 | 1149 | |
0896b752 AA |
1150 | /* connection parameters */ |
1151 | priv->conn_cont.ac.attrs = &priv->conn_attrs[0]; | |
1152 | priv->conn_cont.ac.class = &iscsi_connection_class.class; | |
1153 | priv->conn_cont.ac.match = iscsi_conn_match; | |
1154 | transport_container_register(&priv->conn_cont); | |
1da177e4 | 1155 | |
0896b752 AA |
1156 | SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH); |
1157 | SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH); | |
1158 | SETUP_CONN_RD_ATTR(header_digest, ISCSI_PARAM_HDRDGST_EN); | |
1159 | SETUP_CONN_RD_ATTR(data_digest, ISCSI_PARAM_DATADGST_EN); | |
1160 | SETUP_CONN_RD_ATTR(ifmarker, ISCSI_PARAM_IFMARKER_EN); | |
1161 | SETUP_CONN_RD_ATTR(ofmarker, ISCSI_PARAM_OFMARKER_EN); | |
1162 | ||
1163 | BUG_ON(count > ISCSI_CONN_ATTRS); | |
1164 | priv->conn_attrs[count] = NULL; | |
1da177e4 | 1165 | count = 0; |
1da177e4 | 1166 | |
0896b752 AA |
1167 | /* session parameters */ |
1168 | priv->session_cont.ac.attrs = &priv->session_attrs[0]; | |
1169 | priv->session_cont.ac.class = &iscsi_session_class.class; | |
1170 | priv->session_cont.ac.match = iscsi_session_match; | |
1171 | transport_container_register(&priv->session_cont); | |
1172 | ||
1173 | SETUP_SESSION_RD_ATTR(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN); | |
1174 | SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T); | |
1175 | SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_PARAM_IMM_DATA_EN); | |
1176 | SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_PARAM_FIRST_BURST); | |
1177 | SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_PARAM_MAX_BURST); | |
1178 | SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN); | |
1179 | SETUP_SESSION_RD_ATTR(data_seq_in_order,ISCSI_PARAM_DATASEQ_INORDER_EN) | |
1180 | SETUP_SESSION_RD_ATTR(erl, ISCSI_PARAM_ERL); | |
1181 | ||
1182 | BUG_ON(count > ISCSI_SESSION_ATTRS); | |
1183 | priv->session_attrs[count] = NULL; | |
1184 | ||
1185 | spin_lock_irqsave(&iscsi_transport_lock, flags); | |
1186 | list_add(&priv->list, &iscsi_transports); | |
1187 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
1188 | ||
1189 | printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name); | |
7b8631b5 | 1190 | return &priv->t; |
1da177e4 | 1191 | |
0896b752 AA |
1192 | unregister_cdev: |
1193 | class_device_unregister(&priv->cdev); | |
1194 | free_priv: | |
1195 | kfree(priv); | |
7b8631b5 | 1196 | return NULL; |
1da177e4 | 1197 | } |
0896b752 AA |
1198 | EXPORT_SYMBOL_GPL(iscsi_register_transport); |
1199 | ||
1200 | int iscsi_unregister_transport(struct iscsi_transport *tt) | |
1201 | { | |
1202 | struct iscsi_internal *priv; | |
1203 | unsigned long flags; | |
1204 | ||
1205 | BUG_ON(!tt); | |
1206 | ||
0b950672 | 1207 | mutex_lock(&rx_queue_mutex); |
0896b752 AA |
1208 | |
1209 | priv = iscsi_if_transport_lookup(tt); | |
1210 | BUG_ON (!priv); | |
1211 | ||
0896b752 AA |
1212 | spin_lock_irqsave(&iscsi_transport_lock, flags); |
1213 | list_del(&priv->list); | |
1214 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
1215 | ||
1216 | transport_container_unregister(&priv->conn_cont); | |
1217 | transport_container_unregister(&priv->session_cont); | |
1218 | ||
1219 | sysfs_remove_group(&priv->cdev.kobj, &iscsi_transport_group); | |
1220 | class_device_unregister(&priv->cdev); | |
0b950672 | 1221 | mutex_unlock(&rx_queue_mutex); |
1da177e4 | 1222 | |
0896b752 AA |
1223 | return 0; |
1224 | } | |
1225 | EXPORT_SYMBOL_GPL(iscsi_unregister_transport); | |
1da177e4 | 1226 | |
0896b752 AA |
1227 | static int |
1228 | iscsi_rcv_nl_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1da177e4 | 1229 | { |
0896b752 AA |
1230 | struct netlink_notify *n = ptr; |
1231 | ||
1232 | if (event == NETLINK_URELEASE && | |
1233 | n->protocol == NETLINK_ISCSI && n->pid) { | |
7b8631b5 | 1234 | struct iscsi_cls_conn *conn; |
0896b752 AA |
1235 | unsigned long flags; |
1236 | ||
7b8631b5 | 1237 | mempool_zone_complete(z_reply); |
0896b752 AA |
1238 | spin_lock_irqsave(&connlock, flags); |
1239 | list_for_each_entry(conn, &connlist, conn_list) { | |
7b8631b5 MC |
1240 | mempool_zone_complete(conn->z_error); |
1241 | mempool_zone_complete(conn->z_pdu); | |
0896b752 AA |
1242 | } |
1243 | spin_unlock_irqrestore(&connlock, flags); | |
1244 | } | |
1da177e4 | 1245 | |
0896b752 | 1246 | return NOTIFY_DONE; |
1da177e4 LT |
1247 | } |
1248 | ||
0896b752 AA |
1249 | static struct notifier_block iscsi_nl_notifier = { |
1250 | .notifier_call = iscsi_rcv_nl_event, | |
1251 | }; | |
1da177e4 LT |
1252 | |
1253 | static __init int iscsi_transport_init(void) | |
1254 | { | |
0896b752 | 1255 | int err; |
1da177e4 | 1256 | |
0896b752 | 1257 | err = class_register(&iscsi_transport_class); |
1da177e4 LT |
1258 | if (err) |
1259 | return err; | |
0896b752 AA |
1260 | |
1261 | err = transport_class_register(&iscsi_connection_class); | |
1262 | if (err) | |
1263 | goto unregister_transport_class; | |
1264 | ||
1265 | err = transport_class_register(&iscsi_session_class); | |
1266 | if (err) | |
1267 | goto unregister_conn_class; | |
1268 | ||
1269 | err = netlink_register_notifier(&iscsi_nl_notifier); | |
1270 | if (err) | |
1271 | goto unregister_session_class; | |
1272 | ||
2290d2b6 | 1273 | nls = netlink_kernel_create(NETLINK_ISCSI, 1, iscsi_if_rx, |
7b8631b5 | 1274 | THIS_MODULE); |
0896b752 AA |
1275 | if (!nls) { |
1276 | err = -ENOBUFS; | |
1277 | goto unregister_notifier; | |
1278 | } | |
1279 | ||
7b8631b5 | 1280 | z_reply = mempool_zone_init(Z_MAX_REPLY, |
0896b752 | 1281 | NLMSG_SPACE(sizeof(struct iscsi_uevent)), Z_HIWAT_REPLY); |
7b8631b5 | 1282 | if (z_reply) |
0896b752 AA |
1283 | return 0; |
1284 | ||
1285 | sock_release(nls->sk_socket); | |
1286 | unregister_notifier: | |
1287 | netlink_unregister_notifier(&iscsi_nl_notifier); | |
1288 | unregister_session_class: | |
1289 | transport_class_unregister(&iscsi_session_class); | |
1290 | unregister_conn_class: | |
1291 | transport_class_unregister(&iscsi_connection_class); | |
1292 | unregister_transport_class: | |
1293 | class_unregister(&iscsi_transport_class); | |
1294 | return err; | |
1da177e4 LT |
1295 | } |
1296 | ||
1297 | static void __exit iscsi_transport_exit(void) | |
1298 | { | |
7b8631b5 | 1299 | mempool_zone_destroy(z_reply); |
0896b752 AA |
1300 | sock_release(nls->sk_socket); |
1301 | netlink_unregister_notifier(&iscsi_nl_notifier); | |
1302 | transport_class_unregister(&iscsi_connection_class); | |
1303 | transport_class_unregister(&iscsi_session_class); | |
1304 | class_unregister(&iscsi_transport_class); | |
1da177e4 LT |
1305 | } |
1306 | ||
1307 | module_init(iscsi_transport_init); | |
1308 | module_exit(iscsi_transport_exit); | |
1309 | ||
0896b752 AA |
1310 | MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, " |
1311 | "Dmitry Yusupov <dmitry_yus@yahoo.com>, " | |
1312 | "Alex Aizman <itn780@yahoo.com>"); | |
1313 | MODULE_DESCRIPTION("iSCSI Transport Interface"); | |
1da177e4 | 1314 | MODULE_LICENSE("GPL"); |