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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; | |
0896b752 AA |
41 | /* |
42 | * based on transport capabilities, at register time we set these | |
43 | * bits to tell the transport class it wants attributes displayed | |
44 | * in sysfs or that it can support different iSCSI Data-Path | |
45 | * capabilities | |
46 | */ | |
47 | uint32_t param_mask; | |
48 | ||
49 | struct class_device cdev; | |
1da177e4 LT |
50 | /* |
51 | * We do not have any private or other attrs. | |
52 | */ | |
0896b752 AA |
53 | struct transport_container conn_cont; |
54 | struct class_device_attribute *conn_attrs[ISCSI_CONN_ATTRS + 1]; | |
55 | struct transport_container session_cont; | |
1da177e4 | 56 | struct class_device_attribute *session_attrs[ISCSI_SESSION_ATTRS + 1]; |
1da177e4 LT |
57 | }; |
58 | ||
0896b752 AA |
59 | /* |
60 | * list of registered transports and lock that must | |
61 | * be held while accessing list. The iscsi_transport_lock must | |
0b950672 | 62 | * be acquired after the rx_queue_mutex. |
0896b752 AA |
63 | */ |
64 | static LIST_HEAD(iscsi_transports); | |
65 | static DEFINE_SPINLOCK(iscsi_transport_lock); | |
66 | ||
67 | #define to_iscsi_internal(tmpl) \ | |
68 | container_of(tmpl, struct iscsi_internal, t) | |
69 | ||
70 | #define cdev_to_iscsi_internal(_cdev) \ | |
71 | container_of(_cdev, struct iscsi_internal, cdev) | |
72 | ||
73 | static void iscsi_transport_release(struct class_device *cdev) | |
74 | { | |
75 | struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev); | |
76 | kfree(priv); | |
77 | } | |
1da177e4 | 78 | |
0896b752 AA |
79 | /* |
80 | * iscsi_transport_class represents the iscsi_transports that are | |
81 | * registered. | |
82 | */ | |
83 | static struct class iscsi_transport_class = { | |
84 | .name = "iscsi_transport", | |
85 | .release = iscsi_transport_release, | |
86 | }; | |
87 | ||
88 | static ssize_t | |
89 | show_transport_handle(struct class_device *cdev, char *buf) | |
90 | { | |
91 | struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev); | |
762e2bfa | 92 | return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport)); |
0896b752 AA |
93 | } |
94 | static CLASS_DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL); | |
95 | ||
96 | #define show_transport_attr(name, format) \ | |
97 | static ssize_t \ | |
98 | show_transport_##name(struct class_device *cdev, char *buf) \ | |
99 | { \ | |
100 | struct iscsi_internal *priv = cdev_to_iscsi_internal(cdev); \ | |
101 | return sprintf(buf, format"\n", priv->iscsi_transport->name); \ | |
102 | } \ | |
103 | static CLASS_DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL); | |
104 | ||
105 | show_transport_attr(caps, "0x%x"); | |
106 | show_transport_attr(max_lun, "%d"); | |
107 | show_transport_attr(max_conn, "%d"); | |
108 | show_transport_attr(max_cmd_len, "%d"); | |
109 | ||
110 | static struct attribute *iscsi_transport_attrs[] = { | |
111 | &class_device_attr_handle.attr, | |
112 | &class_device_attr_caps.attr, | |
113 | &class_device_attr_max_lun.attr, | |
114 | &class_device_attr_max_conn.attr, | |
115 | &class_device_attr_max_cmd_len.attr, | |
116 | NULL, | |
117 | }; | |
118 | ||
119 | static struct attribute_group iscsi_transport_group = { | |
120 | .attrs = iscsi_transport_attrs, | |
121 | }; | |
122 | ||
123 | static DECLARE_TRANSPORT_CLASS(iscsi_session_class, | |
124 | "iscsi_session", | |
1da177e4 LT |
125 | NULL, |
126 | NULL, | |
127 | NULL); | |
128 | ||
0896b752 AA |
129 | static DECLARE_TRANSPORT_CLASS(iscsi_connection_class, |
130 | "iscsi_connection", | |
1da177e4 LT |
131 | NULL, |
132 | NULL, | |
133 | NULL); | |
0896b752 AA |
134 | |
135 | static struct sock *nls; | |
136 | static int daemon_pid; | |
0b950672 | 137 | static DEFINE_MUTEX(rx_queue_mutex); |
0896b752 AA |
138 | |
139 | struct mempool_zone { | |
140 | mempool_t *pool; | |
141 | atomic_t allocated; | |
142 | int size; | |
143 | int hiwat; | |
144 | struct list_head freequeue; | |
145 | spinlock_t freelock; | |
146 | }; | |
147 | ||
7b8631b5 | 148 | static struct mempool_zone *z_reply; |
0896b752 | 149 | |
1da177e4 | 150 | /* |
0896b752 AA |
151 | * Z_MAX_* - actual mempool size allocated at the mempool_zone_init() time |
152 | * Z_HIWAT_* - zone's high watermark when if_error bit will be set to -ENOMEM | |
153 | * so daemon will notice OOM on NETLINK tranposrt level and will | |
154 | * be able to predict or change operational behavior | |
1da177e4 | 155 | */ |
0896b752 AA |
156 | #define Z_MAX_REPLY 8 |
157 | #define Z_HIWAT_REPLY 6 | |
158 | #define Z_MAX_PDU 8 | |
159 | #define Z_HIWAT_PDU 6 | |
160 | #define Z_MAX_ERROR 16 | |
161 | #define Z_HIWAT_ERROR 12 | |
162 | ||
7b7232f3 MC |
163 | static LIST_HEAD(sesslist); |
164 | static DEFINE_SPINLOCK(sesslock); | |
7b8631b5 MC |
165 | static LIST_HEAD(connlist); |
166 | static DEFINE_SPINLOCK(connlock); | |
0896b752 | 167 | |
7b7232f3 MC |
168 | static struct iscsi_cls_session *iscsi_session_lookup(uint64_t handle) |
169 | { | |
170 | unsigned long flags; | |
171 | struct iscsi_cls_session *sess; | |
172 | ||
173 | spin_lock_irqsave(&sesslock, flags); | |
174 | list_for_each_entry(sess, &sesslist, sess_list) { | |
175 | if (sess == iscsi_ptr(handle)) { | |
176 | spin_unlock_irqrestore(&sesslock, flags); | |
177 | return sess; | |
178 | } | |
179 | } | |
180 | spin_unlock_irqrestore(&sesslock, flags); | |
181 | return NULL; | |
182 | } | |
183 | ||
184 | static struct iscsi_cls_conn *iscsi_conn_lookup(uint64_t handle) | |
185 | { | |
186 | unsigned long flags; | |
187 | struct iscsi_cls_conn *conn; | |
188 | ||
189 | spin_lock_irqsave(&connlock, flags); | |
190 | list_for_each_entry(conn, &connlist, conn_list) { | |
191 | if (conn == iscsi_ptr(handle)) { | |
192 | spin_unlock_irqrestore(&connlock, flags); | |
193 | return conn; | |
194 | } | |
195 | } | |
196 | spin_unlock_irqrestore(&connlock, flags); | |
197 | return NULL; | |
198 | } | |
199 | ||
7b8631b5 MC |
200 | /* |
201 | * The following functions can be used by LLDs that allocate | |
202 | * their own scsi_hosts or by software iscsi LLDs | |
203 | */ | |
204 | static void iscsi_session_release(struct device *dev) | |
205 | { | |
206 | struct iscsi_cls_session *session = iscsi_dev_to_session(dev); | |
207 | struct iscsi_transport *transport = session->transport; | |
208 | struct Scsi_Host *shost; | |
0896b752 | 209 | |
7b8631b5 MC |
210 | shost = iscsi_session_to_shost(session); |
211 | scsi_host_put(shost); | |
212 | kfree(session); | |
213 | module_put(transport->owner); | |
214 | } | |
0896b752 | 215 | |
7b8631b5 MC |
216 | static int iscsi_is_session_dev(const struct device *dev) |
217 | { | |
218 | return dev->release == iscsi_session_release; | |
219 | } | |
0896b752 | 220 | |
7b8631b5 MC |
221 | /** |
222 | * iscsi_create_session - create iscsi class session | |
223 | * @shost: scsi host | |
224 | * @transport: iscsi transport | |
225 | * | |
226 | * This can be called from a LLD or iscsi_transport | |
227 | **/ | |
228 | struct iscsi_cls_session * | |
229 | iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport) | |
230 | { | |
231 | struct iscsi_cls_session *session; | |
232 | int err; | |
233 | ||
234 | if (!try_module_get(transport->owner)) | |
235 | return NULL; | |
236 | ||
237 | session = kzalloc(sizeof(*session), GFP_KERNEL); | |
238 | if (!session) | |
239 | goto module_put; | |
240 | session->transport = transport; | |
241 | ||
242 | /* this is released in the dev's release function */ | |
243 | scsi_host_get(shost); | |
244 | snprintf(session->dev.bus_id, BUS_ID_SIZE, "session%u", shost->host_no); | |
245 | session->dev.parent = &shost->shost_gendev; | |
246 | session->dev.release = iscsi_session_release; | |
247 | err = device_register(&session->dev); | |
248 | if (err) { | |
249 | dev_printk(KERN_ERR, &session->dev, "iscsi: could not " | |
250 | "register session's dev\n"); | |
251 | goto free_session; | |
252 | } | |
253 | transport_register_device(&session->dev); | |
254 | ||
255 | return session; | |
256 | ||
257 | free_session: | |
258 | kfree(session); | |
259 | module_put: | |
260 | module_put(transport->owner); | |
261 | return NULL; | |
262 | } | |
263 | ||
264 | EXPORT_SYMBOL_GPL(iscsi_create_session); | |
265 | ||
266 | /** | |
267 | * iscsi_destroy_session - destroy iscsi session | |
268 | * @session: iscsi_session | |
269 | * | |
270 | * Can be called by a LLD or iscsi_transport. There must not be | |
271 | * any running connections. | |
272 | **/ | |
273 | int iscsi_destroy_session(struct iscsi_cls_session *session) | |
274 | { | |
275 | transport_unregister_device(&session->dev); | |
276 | device_unregister(&session->dev); | |
277 | return 0; | |
278 | } | |
279 | ||
280 | EXPORT_SYMBOL_GPL(iscsi_destroy_session); | |
281 | ||
282 | static void iscsi_conn_release(struct device *dev) | |
283 | { | |
284 | struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev); | |
285 | struct device *parent = conn->dev.parent; | |
286 | ||
287 | kfree(conn); | |
288 | put_device(parent); | |
289 | } | |
290 | ||
291 | static int iscsi_is_conn_dev(const struct device *dev) | |
292 | { | |
293 | return dev->release == iscsi_conn_release; | |
294 | } | |
295 | ||
296 | /** | |
297 | * iscsi_create_conn - create iscsi class connection | |
298 | * @session: iscsi cls session | |
299 | * @cid: connection id | |
300 | * | |
301 | * This can be called from a LLD or iscsi_transport. The connection | |
302 | * is child of the session so cid must be unique for all connections | |
303 | * on the session. | |
304 | **/ | |
305 | struct iscsi_cls_conn * | |
306 | iscsi_create_conn(struct iscsi_cls_session *session, uint32_t cid) | |
307 | { | |
308 | struct iscsi_transport *transport = session->transport; | |
309 | struct Scsi_Host *shost = iscsi_session_to_shost(session); | |
310 | struct iscsi_cls_conn *conn; | |
311 | int err; | |
312 | ||
313 | conn = kzalloc(sizeof(*conn) + transport->conndata_size, GFP_KERNEL); | |
314 | if (!conn) | |
315 | return NULL; | |
316 | ||
317 | if (transport->conndata_size) | |
318 | conn->dd_data = &conn[1]; | |
319 | ||
320 | INIT_LIST_HEAD(&conn->conn_list); | |
321 | conn->transport = transport; | |
322 | ||
323 | /* this is released in the dev's release function */ | |
324 | if (!get_device(&session->dev)) | |
325 | goto free_conn; | |
326 | snprintf(conn->dev.bus_id, BUS_ID_SIZE, "connection%d:%u", | |
327 | shost->host_no, cid); | |
328 | conn->dev.parent = &session->dev; | |
329 | conn->dev.release = iscsi_conn_release; | |
330 | err = device_register(&conn->dev); | |
331 | if (err) { | |
332 | dev_printk(KERN_ERR, &conn->dev, "iscsi: could not register " | |
333 | "connection's dev\n"); | |
334 | goto release_parent_ref; | |
335 | } | |
336 | transport_register_device(&conn->dev); | |
337 | return conn; | |
338 | ||
339 | release_parent_ref: | |
340 | put_device(&session->dev); | |
341 | free_conn: | |
342 | kfree(conn); | |
343 | return NULL; | |
344 | } | |
345 | ||
346 | EXPORT_SYMBOL_GPL(iscsi_create_conn); | |
347 | ||
348 | /** | |
349 | * iscsi_destroy_conn - destroy iscsi class connection | |
350 | * @session: iscsi cls session | |
351 | * | |
352 | * This can be called from a LLD or iscsi_transport. | |
353 | **/ | |
354 | int iscsi_destroy_conn(struct iscsi_cls_conn *conn) | |
355 | { | |
356 | transport_unregister_device(&conn->dev); | |
357 | device_unregister(&conn->dev); | |
358 | return 0; | |
359 | } | |
360 | ||
361 | EXPORT_SYMBOL_GPL(iscsi_destroy_conn); | |
362 | ||
363 | /* | |
364 | * These functions are used only by software iscsi_transports | |
365 | * which do not allocate and more their scsi_hosts since this | |
366 | * is initiated from userspace. | |
367 | */ | |
368 | ||
369 | /* | |
370 | * iSCSI Session's hostdata organization: | |
371 | * | |
372 | * *------------------* <== hostdata_session(host->hostdata) | |
373 | * | ptr to class sess| | |
374 | * |------------------| <== iscsi_hostdata(host->hostdata) | |
375 | * | transport's data | | |
376 | * *------------------* | |
377 | */ | |
378 | ||
379 | #define hostdata_privsize(_t) (sizeof(unsigned long) + _t->hostdata_size + \ | |
380 | _t->hostdata_size % sizeof(unsigned long)) | |
381 | ||
382 | #define hostdata_session(_hostdata) (iscsi_ptr(*(unsigned long *)_hostdata)) | |
383 | ||
384 | /** | |
385 | * iscsi_transport_create_session - create iscsi cls session and host | |
386 | * scsit: scsi transport template | |
387 | * transport: iscsi transport template | |
388 | * | |
389 | * This can be used by software iscsi_transports that allocate | |
390 | * a session per scsi host. | |
391 | **/ | |
392 | struct Scsi_Host * | |
393 | iscsi_transport_create_session(struct scsi_transport_template *scsit, | |
394 | struct iscsi_transport *transport) | |
395 | { | |
396 | struct iscsi_cls_session *session; | |
397 | struct Scsi_Host *shost; | |
7b7232f3 | 398 | unsigned long flags; |
7b8631b5 MC |
399 | |
400 | shost = scsi_host_alloc(transport->host_template, | |
401 | hostdata_privsize(transport)); | |
402 | if (!shost) { | |
403 | printk(KERN_ERR "iscsi: can not allocate SCSI host for " | |
404 | "session\n"); | |
405 | return NULL; | |
406 | } | |
407 | ||
408 | shost->max_id = 1; | |
409 | shost->max_channel = 0; | |
410 | shost->max_lun = transport->max_lun; | |
411 | shost->max_cmd_len = transport->max_cmd_len; | |
412 | shost->transportt = scsit; | |
55e3299d | 413 | shost->transportt->create_work_queue = 1; |
7b8631b5 MC |
414 | |
415 | if (scsi_add_host(shost, NULL)) | |
416 | goto free_host; | |
417 | ||
418 | session = iscsi_create_session(shost, transport); | |
419 | if (!session) | |
420 | goto remove_host; | |
0896b752 | 421 | |
7b8631b5 | 422 | *(unsigned long*)shost->hostdata = (unsigned long)session; |
7b7232f3 MC |
423 | spin_lock_irqsave(&sesslock, flags); |
424 | list_add(&session->sess_list, &sesslist); | |
425 | spin_unlock_irqrestore(&sesslock, flags); | |
7b8631b5 MC |
426 | return shost; |
427 | ||
428 | remove_host: | |
429 | scsi_remove_host(shost); | |
430 | free_host: | |
431 | scsi_host_put(shost); | |
432 | return NULL; | |
433 | } | |
0896b752 | 434 | |
7b8631b5 | 435 | EXPORT_SYMBOL_GPL(iscsi_transport_create_session); |
0896b752 | 436 | |
7b8631b5 MC |
437 | /** |
438 | * iscsi_transport_destroy_session - destroy session and scsi host | |
439 | * shost: scsi host | |
440 | * | |
441 | * This can be used by software iscsi_transports that allocate | |
442 | * a session per scsi host. | |
443 | **/ | |
444 | int iscsi_transport_destroy_session(struct Scsi_Host *shost) | |
445 | { | |
446 | struct iscsi_cls_session *session; | |
7b7232f3 | 447 | unsigned long flags; |
0896b752 | 448 | |
7b8631b5 MC |
449 | scsi_remove_host(shost); |
450 | session = hostdata_session(shost->hostdata); | |
7b7232f3 MC |
451 | spin_lock_irqsave(&sesslock, flags); |
452 | list_del(&session->sess_list); | |
453 | spin_unlock_irqrestore(&sesslock, flags); | |
7b8631b5 MC |
454 | iscsi_destroy_session(session); |
455 | /* ref from host alloc */ | |
456 | scsi_host_put(shost); | |
457 | return 0; | |
458 | } | |
459 | ||
460 | EXPORT_SYMBOL_GPL(iscsi_transport_destroy_session); | |
461 | ||
462 | /* | |
463 | * iscsi interface functions | |
464 | */ | |
0896b752 AA |
465 | static struct iscsi_internal * |
466 | iscsi_if_transport_lookup(struct iscsi_transport *tt) | |
467 | { | |
468 | struct iscsi_internal *priv; | |
469 | unsigned long flags; | |
470 | ||
471 | spin_lock_irqsave(&iscsi_transport_lock, flags); | |
472 | list_for_each_entry(priv, &iscsi_transports, list) { | |
473 | if (tt == priv->iscsi_transport) { | |
474 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
475 | return priv; | |
476 | } | |
477 | } | |
478 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
479 | return NULL; | |
480 | } | |
1da177e4 | 481 | |
0896b752 AA |
482 | static inline struct list_head *skb_to_lh(struct sk_buff *skb) |
483 | { | |
484 | return (struct list_head *)&skb->cb; | |
485 | } | |
1da177e4 | 486 | |
0896b752 | 487 | static void* |
28e5554d | 488 | mempool_zone_alloc_skb(gfp_t gfp_mask, void *pool_data) |
0896b752 AA |
489 | { |
490 | struct mempool_zone *zone = pool_data; | |
1da177e4 | 491 | |
0896b752 | 492 | return alloc_skb(zone->size, gfp_mask); |
1da177e4 LT |
493 | } |
494 | ||
0896b752 AA |
495 | static void |
496 | mempool_zone_free_skb(void *element, void *pool_data) | |
497 | { | |
498 | kfree_skb(element); | |
499 | } | |
1da177e4 | 500 | |
0896b752 AA |
501 | static void |
502 | mempool_zone_complete(struct mempool_zone *zone) | |
503 | { | |
504 | unsigned long flags; | |
505 | struct list_head *lh, *n; | |
1da177e4 | 506 | |
0896b752 AA |
507 | spin_lock_irqsave(&zone->freelock, flags); |
508 | list_for_each_safe(lh, n, &zone->freequeue) { | |
509 | struct sk_buff *skb = (struct sk_buff *)((char *)lh - | |
510 | offsetof(struct sk_buff, cb)); | |
511 | if (!skb_shared(skb)) { | |
512 | list_del(skb_to_lh(skb)); | |
513 | mempool_free(skb, zone->pool); | |
514 | atomic_dec(&zone->allocated); | |
515 | } | |
516 | } | |
517 | spin_unlock_irqrestore(&zone->freelock, flags); | |
1da177e4 LT |
518 | } |
519 | ||
7b8631b5 MC |
520 | static struct mempool_zone * |
521 | mempool_zone_init(unsigned max, unsigned size, unsigned hiwat) | |
0896b752 | 522 | { |
7b8631b5 MC |
523 | struct mempool_zone *zp; |
524 | ||
525 | zp = kzalloc(sizeof(*zp), GFP_KERNEL); | |
526 | if (!zp) | |
527 | return NULL; | |
528 | ||
142e301f MC |
529 | zp->size = size; |
530 | zp->hiwat = hiwat; | |
531 | INIT_LIST_HEAD(&zp->freequeue); | |
532 | spin_lock_init(&zp->freelock); | |
533 | atomic_set(&zp->allocated, 0); | |
534 | ||
0896b752 AA |
535 | zp->pool = mempool_create(max, mempool_zone_alloc_skb, |
536 | mempool_zone_free_skb, zp); | |
7b8631b5 MC |
537 | if (!zp->pool) { |
538 | kfree(zp); | |
539 | return NULL; | |
540 | } | |
1da177e4 | 541 | |
7b8631b5 | 542 | return zp; |
0896b752 AA |
543 | } |
544 | ||
7b8631b5 MC |
545 | static void mempool_zone_destroy(struct mempool_zone *zp) |
546 | { | |
547 | mempool_destroy(zp->pool); | |
548 | kfree(zp); | |
549 | } | |
0896b752 AA |
550 | |
551 | static struct sk_buff* | |
552 | mempool_zone_get_skb(struct mempool_zone *zone) | |
1da177e4 | 553 | { |
0896b752 AA |
554 | struct sk_buff *skb; |
555 | ||
556 | skb = mempool_alloc(zone->pool, GFP_ATOMIC); | |
557 | if (skb) | |
558 | atomic_inc(&zone->allocated); | |
559 | return skb; | |
560 | } | |
1da177e4 | 561 | |
0896b752 AA |
562 | static int |
563 | iscsi_unicast_skb(struct mempool_zone *zone, struct sk_buff *skb) | |
564 | { | |
565 | unsigned long flags; | |
566 | int rc; | |
1da177e4 | 567 | |
0896b752 AA |
568 | skb_get(skb); |
569 | rc = netlink_unicast(nls, skb, daemon_pid, MSG_DONTWAIT); | |
570 | if (rc < 0) { | |
571 | mempool_free(skb, zone->pool); | |
572 | printk(KERN_ERR "iscsi: can not unicast skb (%d)\n", rc); | |
573 | return rc; | |
574 | } | |
575 | ||
576 | spin_lock_irqsave(&zone->freelock, flags); | |
577 | list_add(skb_to_lh(skb), &zone->freequeue); | |
578 | spin_unlock_irqrestore(&zone->freelock, flags); | |
579 | ||
580 | return 0; | |
1da177e4 | 581 | } |
1da177e4 | 582 | |
7b7232f3 | 583 | int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr, |
0896b752 | 584 | char *data, uint32_t data_size) |
1da177e4 | 585 | { |
0896b752 AA |
586 | struct nlmsghdr *nlh; |
587 | struct sk_buff *skb; | |
588 | struct iscsi_uevent *ev; | |
0896b752 AA |
589 | char *pdu; |
590 | int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) + | |
591 | data_size); | |
592 | ||
7b8631b5 | 593 | mempool_zone_complete(conn->z_pdu); |
0896b752 | 594 | |
7b8631b5 | 595 | skb = mempool_zone_get_skb(conn->z_pdu); |
0896b752 | 596 | if (!skb) { |
7b7232f3 | 597 | iscsi_conn_error(conn, ISCSI_ERR_CONN_FAILED); |
7b8631b5 MC |
598 | dev_printk(KERN_ERR, &conn->dev, "iscsi: can not deliver " |
599 | "control PDU: OOM\n"); | |
0896b752 AA |
600 | return -ENOMEM; |
601 | } | |
1da177e4 | 602 | |
0896b752 AA |
603 | nlh = __nlmsg_put(skb, daemon_pid, 0, 0, (len - sizeof(*nlh)), 0); |
604 | ev = NLMSG_DATA(nlh); | |
605 | memset(ev, 0, sizeof(*ev)); | |
606 | ev->transport_handle = iscsi_handle(conn->transport); | |
607 | ev->type = ISCSI_KEVENT_RECV_PDU; | |
7b8631b5 | 608 | if (atomic_read(&conn->z_pdu->allocated) >= conn->z_pdu->hiwat) |
0896b752 | 609 | ev->iferror = -ENOMEM; |
7b7232f3 | 610 | ev->r.recv_req.conn_handle = iscsi_handle(conn); |
0896b752 AA |
611 | pdu = (char*)ev + sizeof(*ev); |
612 | memcpy(pdu, hdr, sizeof(struct iscsi_hdr)); | |
613 | memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size); | |
1da177e4 | 614 | |
7b8631b5 | 615 | return iscsi_unicast_skb(conn->z_pdu, skb); |
1da177e4 | 616 | } |
0896b752 | 617 | EXPORT_SYMBOL_GPL(iscsi_recv_pdu); |
1da177e4 | 618 | |
7b7232f3 | 619 | void iscsi_conn_error(struct iscsi_cls_conn *conn, enum iscsi_err error) |
1da177e4 | 620 | { |
0896b752 AA |
621 | struct nlmsghdr *nlh; |
622 | struct sk_buff *skb; | |
623 | struct iscsi_uevent *ev; | |
0896b752 AA |
624 | int len = NLMSG_SPACE(sizeof(*ev)); |
625 | ||
7b8631b5 | 626 | mempool_zone_complete(conn->z_error); |
0896b752 | 627 | |
7b8631b5 | 628 | skb = mempool_zone_get_skb(conn->z_error); |
0896b752 | 629 | if (!skb) { |
7b8631b5 MC |
630 | dev_printk(KERN_ERR, &conn->dev, "iscsi: gracefully ignored " |
631 | "conn error (%d)\n", error); | |
0896b752 AA |
632 | return; |
633 | } | |
634 | ||
635 | nlh = __nlmsg_put(skb, daemon_pid, 0, 0, (len - sizeof(*nlh)), 0); | |
636 | ev = NLMSG_DATA(nlh); | |
637 | ev->transport_handle = iscsi_handle(conn->transport); | |
638 | ev->type = ISCSI_KEVENT_CONN_ERROR; | |
7b8631b5 | 639 | if (atomic_read(&conn->z_error->allocated) >= conn->z_error->hiwat) |
0896b752 AA |
640 | ev->iferror = -ENOMEM; |
641 | ev->r.connerror.error = error; | |
7b7232f3 | 642 | ev->r.connerror.conn_handle = iscsi_handle(conn); |
1da177e4 | 643 | |
7b8631b5 | 644 | iscsi_unicast_skb(conn->z_error, skb); |
1da177e4 | 645 | |
7b8631b5 MC |
646 | dev_printk(KERN_INFO, &conn->dev, "iscsi: detected conn error (%d)\n", |
647 | error); | |
0896b752 AA |
648 | } |
649 | EXPORT_SYMBOL_GPL(iscsi_conn_error); | |
650 | ||
651 | static int | |
652 | iscsi_if_send_reply(int pid, int seq, int type, int done, int multi, | |
653 | void *payload, int size) | |
654 | { | |
655 | struct sk_buff *skb; | |
656 | struct nlmsghdr *nlh; | |
657 | int len = NLMSG_SPACE(size); | |
658 | int flags = multi ? NLM_F_MULTI : 0; | |
659 | int t = done ? NLMSG_DONE : type; | |
660 | ||
7b8631b5 | 661 | mempool_zone_complete(z_reply); |
0896b752 | 662 | |
7b8631b5 | 663 | skb = mempool_zone_get_skb(z_reply); |
0896b752 AA |
664 | /* |
665 | * FIXME: | |
666 | * user is supposed to react on iferror == -ENOMEM; | |
667 | * see iscsi_if_rx(). | |
668 | */ | |
669 | BUG_ON(!skb); | |
670 | ||
671 | nlh = __nlmsg_put(skb, pid, seq, t, (len - sizeof(*nlh)), 0); | |
672 | nlh->nlmsg_flags = flags; | |
673 | memcpy(NLMSG_DATA(nlh), payload, size); | |
7b8631b5 | 674 | return iscsi_unicast_skb(z_reply, skb); |
1da177e4 | 675 | } |
1da177e4 | 676 | |
7b8631b5 | 677 | static int |
5b940adf | 678 | iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh) |
7b8631b5 MC |
679 | { |
680 | struct iscsi_uevent *ev = NLMSG_DATA(nlh); | |
681 | struct iscsi_stats *stats; | |
682 | struct sk_buff *skbstat; | |
683 | struct iscsi_cls_conn *conn; | |
684 | struct nlmsghdr *nlhstat; | |
685 | struct iscsi_uevent *evstat; | |
686 | int len = NLMSG_SPACE(sizeof(*ev) + | |
687 | sizeof(struct iscsi_stats) + | |
688 | sizeof(struct iscsi_stats_custom) * | |
689 | ISCSI_STATS_CUSTOM_MAX); | |
690 | int err = 0; | |
0896b752 | 691 | |
7b7232f3 | 692 | conn = iscsi_conn_lookup(ev->u.get_stats.conn_handle); |
7b8631b5 MC |
693 | if (!conn) |
694 | return -EEXIST; | |
0896b752 | 695 | |
7b8631b5 MC |
696 | do { |
697 | int actual_size; | |
0896b752 | 698 | |
7b8631b5 | 699 | mempool_zone_complete(conn->z_pdu); |
0896b752 | 700 | |
7b8631b5 MC |
701 | skbstat = mempool_zone_get_skb(conn->z_pdu); |
702 | if (!skbstat) { | |
703 | dev_printk(KERN_ERR, &conn->dev, "iscsi: can not " | |
704 | "deliver stats: OOM\n"); | |
705 | return -ENOMEM; | |
706 | } | |
707 | ||
708 | nlhstat = __nlmsg_put(skbstat, daemon_pid, 0, 0, | |
709 | (len - sizeof(*nlhstat)), 0); | |
710 | evstat = NLMSG_DATA(nlhstat); | |
711 | memset(evstat, 0, sizeof(*evstat)); | |
712 | evstat->transport_handle = iscsi_handle(conn->transport); | |
713 | evstat->type = nlh->nlmsg_type; | |
714 | if (atomic_read(&conn->z_pdu->allocated) >= conn->z_pdu->hiwat) | |
715 | evstat->iferror = -ENOMEM; | |
716 | evstat->u.get_stats.conn_handle = | |
717 | ev->u.get_stats.conn_handle; | |
718 | stats = (struct iscsi_stats *) | |
719 | ((char*)evstat + sizeof(*evstat)); | |
720 | memset(stats, 0, sizeof(*stats)); | |
721 | ||
7b7232f3 | 722 | transport->get_stats(conn, stats); |
7b8631b5 MC |
723 | actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) + |
724 | sizeof(struct iscsi_stats) + | |
725 | sizeof(struct iscsi_stats_custom) * | |
726 | stats->custom_length); | |
727 | actual_size -= sizeof(*nlhstat); | |
728 | actual_size = NLMSG_LENGTH(actual_size); | |
5b940adf | 729 | skb_trim(skbstat, NLMSG_ALIGN(actual_size)); |
7b8631b5 MC |
730 | nlhstat->nlmsg_len = actual_size; |
731 | ||
732 | err = iscsi_unicast_skb(conn->z_pdu, skbstat); | |
733 | } while (err < 0 && err != -ECONNREFUSED); | |
734 | ||
735 | return err; | |
0896b752 AA |
736 | } |
737 | ||
738 | static int | |
739 | iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_uevent *ev) | |
740 | { | |
741 | struct iscsi_transport *transport = priv->iscsi_transport; | |
7b7232f3 MC |
742 | struct iscsi_cls_session *session; |
743 | uint32_t sid; | |
0896b752 | 744 | |
7b7232f3 MC |
745 | session = transport->create_session(&priv->t, |
746 | ev->u.c_session.initial_cmdsn, | |
747 | &sid); | |
748 | if (!session) | |
7b8631b5 | 749 | return -ENOMEM; |
0896b752 | 750 | |
7b7232f3 MC |
751 | ev->r.c_session_ret.session_handle = iscsi_handle(session); |
752 | ev->r.c_session_ret.sid = sid; | |
0896b752 | 753 | return 0; |
0896b752 AA |
754 | } |
755 | ||
756 | static int | |
7b7232f3 | 757 | iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev) |
0896b752 | 758 | { |
7b8631b5 | 759 | struct iscsi_cls_conn *conn; |
7b7232f3 | 760 | struct iscsi_cls_session *session; |
0896b752 | 761 | unsigned long flags; |
7b8631b5 | 762 | |
7b7232f3 MC |
763 | session = iscsi_session_lookup(ev->u.c_conn.session_handle); |
764 | if (!session) | |
7b8631b5 | 765 | return -EINVAL; |
0896b752 | 766 | |
7b7232f3 | 767 | conn = transport->create_conn(session, ev->u.c_conn.cid); |
7b8631b5 | 768 | if (!conn) |
7b7232f3 | 769 | return -ENOMEM; |
0896b752 | 770 | |
7b8631b5 | 771 | conn->z_pdu = mempool_zone_init(Z_MAX_PDU, |
0896b752 AA |
772 | NLMSG_SPACE(sizeof(struct iscsi_uevent) + |
773 | sizeof(struct iscsi_hdr) + | |
774 | DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH), | |
775 | Z_HIWAT_PDU); | |
7b8631b5 MC |
776 | if (!conn->z_pdu) { |
777 | dev_printk(KERN_ERR, &conn->dev, "iscsi: can not allocate " | |
778 | "pdu zone for new conn\n"); | |
779 | goto destroy_conn; | |
0896b752 | 780 | } |
7b8631b5 MC |
781 | |
782 | conn->z_error = mempool_zone_init(Z_MAX_ERROR, | |
0896b752 AA |
783 | NLMSG_SPACE(sizeof(struct iscsi_uevent)), |
784 | Z_HIWAT_ERROR); | |
7b8631b5 MC |
785 | if (!conn->z_error) { |
786 | dev_printk(KERN_ERR, &conn->dev, "iscsi: can not allocate " | |
787 | "error zone for new conn\n"); | |
788 | goto free_pdu_pool; | |
0896b752 AA |
789 | } |
790 | ||
7b7232f3 | 791 | ev->r.handle = iscsi_handle(conn); |
0896b752 AA |
792 | |
793 | spin_lock_irqsave(&connlock, flags); | |
794 | list_add(&conn->conn_list, &connlist); | |
0896b752 AA |
795 | conn->active = 1; |
796 | spin_unlock_irqrestore(&connlock, flags); | |
797 | ||
0896b752 AA |
798 | return 0; |
799 | ||
7b8631b5 MC |
800 | free_pdu_pool: |
801 | mempool_zone_destroy(conn->z_pdu); | |
802 | destroy_conn: | |
803 | if (transport->destroy_conn) | |
804 | transport->destroy_conn(conn->dd_data); | |
7b8631b5 | 805 | return -ENOMEM; |
1da177e4 LT |
806 | } |
807 | ||
0896b752 AA |
808 | static int |
809 | iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev) | |
810 | { | |
811 | unsigned long flags; | |
7b8631b5 MC |
812 | struct iscsi_cls_conn *conn; |
813 | struct mempool_zone *z_error, *z_pdu; | |
0896b752 | 814 | |
7b7232f3 | 815 | conn = iscsi_conn_lookup(ev->u.d_conn.conn_handle); |
0896b752 | 816 | if (!conn) |
7b8631b5 | 817 | return -EINVAL; |
0896b752 AA |
818 | spin_lock_irqsave(&connlock, flags); |
819 | conn->active = 0; | |
820 | list_del(&conn->conn_list); | |
821 | spin_unlock_irqrestore(&connlock, flags); | |
822 | ||
7b8631b5 MC |
823 | z_pdu = conn->z_pdu; |
824 | z_error = conn->z_error; | |
0896b752 | 825 | |
7b8631b5 MC |
826 | if (transport->destroy_conn) |
827 | transport->destroy_conn(conn); | |
0896b752 | 828 | |
7b8631b5 MC |
829 | mempool_zone_destroy(z_pdu); |
830 | mempool_zone_destroy(z_error); | |
0896b752 | 831 | |
7b8631b5 | 832 | return 0; |
0896b752 AA |
833 | } |
834 | ||
835 | static int | |
836 | iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) | |
837 | { | |
838 | int err = 0; | |
839 | struct iscsi_uevent *ev = NLMSG_DATA(nlh); | |
840 | struct iscsi_transport *transport = NULL; | |
841 | struct iscsi_internal *priv; | |
7b7232f3 MC |
842 | struct iscsi_cls_session *session; |
843 | struct iscsi_cls_conn *conn; | |
0896b752 | 844 | |
0896b752 AA |
845 | priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle)); |
846 | if (!priv) | |
847 | return -EINVAL; | |
848 | transport = priv->iscsi_transport; | |
849 | ||
7b7232f3 MC |
850 | if (!try_module_get(transport->owner)) |
851 | return -EINVAL; | |
852 | ||
0896b752 AA |
853 | switch (nlh->nlmsg_type) { |
854 | case ISCSI_UEVENT_CREATE_SESSION: | |
855 | err = iscsi_if_create_session(priv, ev); | |
856 | break; | |
857 | case ISCSI_UEVENT_DESTROY_SESSION: | |
7b7232f3 MC |
858 | session = iscsi_session_lookup(ev->u.d_session.session_handle); |
859 | if (session) | |
860 | transport->destroy_session(session); | |
861 | else | |
862 | err = -EINVAL; | |
0896b752 AA |
863 | break; |
864 | case ISCSI_UEVENT_CREATE_CONN: | |
865 | err = iscsi_if_create_conn(transport, ev); | |
866 | break; | |
867 | case ISCSI_UEVENT_DESTROY_CONN: | |
868 | err = iscsi_if_destroy_conn(transport, ev); | |
869 | break; | |
870 | case ISCSI_UEVENT_BIND_CONN: | |
7b7232f3 MC |
871 | session = iscsi_session_lookup(ev->u.b_conn.session_handle); |
872 | conn = iscsi_conn_lookup(ev->u.b_conn.conn_handle); | |
873 | ||
874 | if (session && conn) | |
875 | ev->r.retcode = transport->bind_conn(session, conn, | |
876 | ev->u.b_conn.transport_fd, | |
877 | ev->u.b_conn.is_leading); | |
878 | else | |
879 | err = -EINVAL; | |
0896b752 AA |
880 | break; |
881 | case ISCSI_UEVENT_SET_PARAM: | |
7b7232f3 MC |
882 | conn = iscsi_conn_lookup(ev->u.set_param.conn_handle); |
883 | if (conn) | |
884 | ev->r.retcode = transport->set_param(conn, | |
885 | ev->u.set_param.param, ev->u.set_param.value); | |
886 | else | |
887 | err = -EINVAL; | |
0896b752 AA |
888 | break; |
889 | case ISCSI_UEVENT_START_CONN: | |
7b7232f3 MC |
890 | conn = iscsi_conn_lookup(ev->u.start_conn.conn_handle); |
891 | if (conn) | |
892 | ev->r.retcode = transport->start_conn(conn); | |
893 | else | |
894 | err = -EINVAL; | |
895 | ||
0896b752 AA |
896 | break; |
897 | case ISCSI_UEVENT_STOP_CONN: | |
7b7232f3 MC |
898 | conn = iscsi_conn_lookup(ev->u.stop_conn.conn_handle); |
899 | if (conn) | |
900 | transport->stop_conn(conn, ev->u.stop_conn.flag); | |
901 | else | |
902 | err = -EINVAL; | |
0896b752 AA |
903 | break; |
904 | case ISCSI_UEVENT_SEND_PDU: | |
7b7232f3 MC |
905 | conn = iscsi_conn_lookup(ev->u.send_pdu.conn_handle); |
906 | if (conn) | |
907 | ev->r.retcode = transport->send_pdu(conn, | |
908 | (struct iscsi_hdr*)((char*)ev + sizeof(*ev)), | |
909 | (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size, | |
910 | ev->u.send_pdu.data_size); | |
911 | else | |
912 | err = -EINVAL; | |
0896b752 AA |
913 | break; |
914 | case ISCSI_UEVENT_GET_STATS: | |
5b940adf | 915 | err = iscsi_if_get_stats(transport, nlh); |
0896b752 AA |
916 | break; |
917 | default: | |
918 | err = -EINVAL; | |
919 | break; | |
920 | } | |
921 | ||
7b7232f3 | 922 | module_put(transport->owner); |
0896b752 AA |
923 | return err; |
924 | } | |
925 | ||
926 | /* Get message from skb (based on rtnetlink_rcv_skb). Each message is | |
927 | * processed by iscsi_if_recv_msg. Malformed skbs with wrong length are | |
ee7f8e40 | 928 | * or invalid creds discarded silently. */ |
0896b752 AA |
929 | static void |
930 | iscsi_if_rx(struct sock *sk, int len) | |
931 | { | |
932 | struct sk_buff *skb; | |
1da177e4 | 933 | |
0b950672 | 934 | mutex_lock(&rx_queue_mutex); |
0896b752 | 935 | while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { |
ee7f8e40 MC |
936 | if (NETLINK_CREDS(skb)->uid) { |
937 | skb_pull(skb, skb->len); | |
938 | goto free_skb; | |
939 | } | |
940 | daemon_pid = NETLINK_CREDS(skb)->pid; | |
941 | ||
0896b752 AA |
942 | while (skb->len >= NLMSG_SPACE(0)) { |
943 | int err; | |
944 | uint32_t rlen; | |
945 | struct nlmsghdr *nlh; | |
946 | struct iscsi_uevent *ev; | |
947 | ||
948 | nlh = (struct nlmsghdr *)skb->data; | |
949 | if (nlh->nlmsg_len < sizeof(*nlh) || | |
950 | skb->len < nlh->nlmsg_len) { | |
951 | break; | |
952 | } | |
ee7f8e40 | 953 | |
0896b752 AA |
954 | ev = NLMSG_DATA(nlh); |
955 | rlen = NLMSG_ALIGN(nlh->nlmsg_len); | |
956 | if (rlen > skb->len) | |
957 | rlen = skb->len; | |
ee7f8e40 | 958 | |
0896b752 AA |
959 | err = iscsi_if_recv_msg(skb, nlh); |
960 | if (err) { | |
961 | ev->type = ISCSI_KEVENT_IF_ERROR; | |
962 | ev->iferror = err; | |
963 | } | |
964 | do { | |
965 | /* | |
966 | * special case for GET_STATS: | |
967 | * on success - sending reply and stats from | |
968 | * inside of if_recv_msg(), | |
969 | * on error - fall through. | |
970 | */ | |
971 | if (ev->type == ISCSI_UEVENT_GET_STATS && !err) | |
972 | break; | |
973 | err = iscsi_if_send_reply( | |
974 | NETLINK_CREDS(skb)->pid, nlh->nlmsg_seq, | |
975 | nlh->nlmsg_type, 0, 0, ev, sizeof(*ev)); | |
7b8631b5 MC |
976 | if (atomic_read(&z_reply->allocated) >= |
977 | z_reply->hiwat) | |
0896b752 AA |
978 | ev->iferror = -ENOMEM; |
979 | } while (err < 0 && err != -ECONNREFUSED); | |
980 | skb_pull(skb, rlen); | |
981 | } | |
ee7f8e40 | 982 | free_skb: |
0896b752 AA |
983 | kfree_skb(skb); |
984 | } | |
0b950672 | 985 | mutex_unlock(&rx_queue_mutex); |
0896b752 | 986 | } |
1da177e4 | 987 | |
7b8631b5 MC |
988 | #define iscsi_cdev_to_conn(_cdev) \ |
989 | iscsi_dev_to_conn(_cdev->dev) | |
990 | ||
1da177e4 | 991 | /* |
0896b752 | 992 | * iSCSI connection attrs |
1da177e4 | 993 | */ |
0896b752 AA |
994 | #define iscsi_conn_int_attr_show(param, format) \ |
995 | static ssize_t \ | |
996 | show_conn_int_param_##param(struct class_device *cdev, char *buf) \ | |
997 | { \ | |
998 | uint32_t value = 0; \ | |
7b8631b5 MC |
999 | struct iscsi_cls_conn *conn = iscsi_cdev_to_conn(cdev); \ |
1000 | struct iscsi_transport *t = conn->transport; \ | |
0896b752 | 1001 | \ |
7b7232f3 | 1002 | t->get_conn_param(conn, param, &value); \ |
0896b752 AA |
1003 | return snprintf(buf, 20, format"\n", value); \ |
1004 | } | |
1005 | ||
1006 | #define iscsi_conn_int_attr(field, param, format) \ | |
1007 | iscsi_conn_int_attr_show(param, format) \ | |
1008 | static CLASS_DEVICE_ATTR(field, S_IRUGO, show_conn_int_param_##param, NULL); | |
1009 | ||
1010 | iscsi_conn_int_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH, "%u"); | |
1011 | iscsi_conn_int_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH, "%u"); | |
1012 | iscsi_conn_int_attr(header_digest, ISCSI_PARAM_HDRDGST_EN, "%d"); | |
1013 | iscsi_conn_int_attr(data_digest, ISCSI_PARAM_DATADGST_EN, "%d"); | |
1014 | iscsi_conn_int_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN, "%d"); | |
1015 | iscsi_conn_int_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN, "%d"); | |
1da177e4 | 1016 | |
7b8631b5 MC |
1017 | #define iscsi_cdev_to_session(_cdev) \ |
1018 | iscsi_dev_to_session(_cdev->dev) | |
1019 | ||
1da177e4 | 1020 | /* |
0896b752 | 1021 | * iSCSI session attrs |
1da177e4 | 1022 | */ |
0896b752 | 1023 | #define iscsi_session_int_attr_show(param, format) \ |
1da177e4 | 1024 | static ssize_t \ |
0896b752 | 1025 | show_session_int_param_##param(struct class_device *cdev, char *buf) \ |
1da177e4 | 1026 | { \ |
0896b752 | 1027 | uint32_t value = 0; \ |
7b8631b5 | 1028 | struct iscsi_cls_session *session = iscsi_cdev_to_session(cdev); \ |
7b8631b5 | 1029 | struct iscsi_transport *t = session->transport; \ |
1da177e4 | 1030 | \ |
7b7232f3 | 1031 | t->get_session_param(session, param, &value); \ |
0896b752 | 1032 | return snprintf(buf, 20, format"\n", value); \ |
1da177e4 LT |
1033 | } |
1034 | ||
0896b752 AA |
1035 | #define iscsi_session_int_attr(field, param, format) \ |
1036 | iscsi_session_int_attr_show(param, format) \ | |
1037 | static CLASS_DEVICE_ATTR(field, S_IRUGO, show_session_int_param_##param, NULL); | |
1da177e4 | 1038 | |
0896b752 AA |
1039 | iscsi_session_int_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, "%d"); |
1040 | iscsi_session_int_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, "%hu"); | |
1041 | iscsi_session_int_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, "%d"); | |
1042 | iscsi_session_int_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, "%u"); | |
1043 | iscsi_session_int_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, "%u"); | |
1044 | iscsi_session_int_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, "%d"); | |
1045 | iscsi_session_int_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, "%d"); | |
1046 | iscsi_session_int_attr(erl, ISCSI_PARAM_ERL, "%d"); | |
1da177e4 | 1047 | |
0896b752 AA |
1048 | #define SETUP_SESSION_RD_ATTR(field, param) \ |
1049 | if (priv->param_mask & (1 << param)) { \ | |
1050 | priv->session_attrs[count] = &class_device_attr_##field;\ | |
1da177e4 LT |
1051 | count++; \ |
1052 | } | |
1053 | ||
0896b752 AA |
1054 | #define SETUP_CONN_RD_ATTR(field, param) \ |
1055 | if (priv->param_mask & (1 << param)) { \ | |
1056 | priv->conn_attrs[count] = &class_device_attr_##field; \ | |
1da177e4 LT |
1057 | count++; \ |
1058 | } | |
1059 | ||
0896b752 AA |
1060 | static int iscsi_session_match(struct attribute_container *cont, |
1061 | struct device *dev) | |
1da177e4 | 1062 | { |
7b8631b5 | 1063 | struct iscsi_cls_session *session; |
1da177e4 | 1064 | struct Scsi_Host *shost; |
0896b752 AA |
1065 | struct iscsi_internal *priv; |
1066 | ||
1067 | if (!iscsi_is_session_dev(dev)) | |
1068 | return 0; | |
1da177e4 | 1069 | |
7b8631b5 MC |
1070 | session = iscsi_dev_to_session(dev); |
1071 | shost = iscsi_session_to_shost(session); | |
0896b752 | 1072 | if (!shost->transportt) |
1da177e4 LT |
1073 | return 0; |
1074 | ||
0896b752 AA |
1075 | priv = to_iscsi_internal(shost->transportt); |
1076 | if (priv->session_cont.ac.class != &iscsi_session_class.class) | |
1da177e4 LT |
1077 | return 0; |
1078 | ||
0896b752 | 1079 | return &priv->session_cont.ac == cont; |
1da177e4 LT |
1080 | } |
1081 | ||
0896b752 AA |
1082 | static int iscsi_conn_match(struct attribute_container *cont, |
1083 | struct device *dev) | |
1084 | { | |
7b8631b5 MC |
1085 | struct iscsi_cls_session *session; |
1086 | struct iscsi_cls_conn *conn; | |
1da177e4 | 1087 | struct Scsi_Host *shost; |
0896b752 | 1088 | struct iscsi_internal *priv; |
1da177e4 | 1089 | |
0896b752 | 1090 | if (!iscsi_is_conn_dev(dev)) |
1da177e4 LT |
1091 | return 0; |
1092 | ||
7b8631b5 MC |
1093 | conn = iscsi_dev_to_conn(dev); |
1094 | session = iscsi_dev_to_session(conn->dev.parent); | |
1095 | shost = iscsi_session_to_shost(session); | |
1096 | ||
0896b752 | 1097 | if (!shost->transportt) |
1da177e4 LT |
1098 | return 0; |
1099 | ||
0896b752 AA |
1100 | priv = to_iscsi_internal(shost->transportt); |
1101 | if (priv->conn_cont.ac.class != &iscsi_connection_class.class) | |
1102 | return 0; | |
1da177e4 | 1103 | |
0896b752 AA |
1104 | return &priv->conn_cont.ac == cont; |
1105 | } | |
1106 | ||
7b8631b5 MC |
1107 | struct scsi_transport_template * |
1108 | iscsi_register_transport(struct iscsi_transport *tt) | |
0896b752 AA |
1109 | { |
1110 | struct iscsi_internal *priv; | |
1111 | unsigned long flags; | |
1112 | int count = 0, err; | |
1113 | ||
1114 | BUG_ON(!tt); | |
1115 | ||
1116 | priv = iscsi_if_transport_lookup(tt); | |
1117 | if (priv) | |
7b8631b5 | 1118 | return NULL; |
0896b752 | 1119 | |
24669f75 | 1120 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
0896b752 | 1121 | if (!priv) |
7b8631b5 | 1122 | return NULL; |
0896b752 | 1123 | INIT_LIST_HEAD(&priv->list); |
0896b752 AA |
1124 | priv->iscsi_transport = tt; |
1125 | ||
1126 | priv->cdev.class = &iscsi_transport_class; | |
1127 | snprintf(priv->cdev.class_id, BUS_ID_SIZE, "%s", tt->name); | |
1128 | err = class_device_register(&priv->cdev); | |
1129 | if (err) | |
1130 | goto free_priv; | |
1131 | ||
1132 | err = sysfs_create_group(&priv->cdev.kobj, &iscsi_transport_group); | |
1133 | if (err) | |
1134 | goto unregister_cdev; | |
1135 | ||
1136 | /* setup parameters mask */ | |
1137 | priv->param_mask = 0xFFFFFFFF; | |
1138 | if (!(tt->caps & CAP_MULTI_R2T)) | |
1139 | priv->param_mask &= ~(1 << ISCSI_PARAM_MAX_R2T); | |
1140 | if (!(tt->caps & CAP_HDRDGST)) | |
1141 | priv->param_mask &= ~(1 << ISCSI_PARAM_HDRDGST_EN); | |
1142 | if (!(tt->caps & CAP_DATADGST)) | |
1143 | priv->param_mask &= ~(1 << ISCSI_PARAM_DATADGST_EN); | |
1144 | if (!(tt->caps & CAP_MARKERS)) { | |
1145 | priv->param_mask &= ~(1 << ISCSI_PARAM_IFMARKER_EN); | |
1146 | priv->param_mask &= ~(1 << ISCSI_PARAM_OFMARKER_EN); | |
1147 | } | |
1da177e4 | 1148 | |
0896b752 AA |
1149 | /* connection parameters */ |
1150 | priv->conn_cont.ac.attrs = &priv->conn_attrs[0]; | |
1151 | priv->conn_cont.ac.class = &iscsi_connection_class.class; | |
1152 | priv->conn_cont.ac.match = iscsi_conn_match; | |
1153 | transport_container_register(&priv->conn_cont); | |
1da177e4 | 1154 | |
0896b752 AA |
1155 | SETUP_CONN_RD_ATTR(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH); |
1156 | SETUP_CONN_RD_ATTR(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH); | |
1157 | SETUP_CONN_RD_ATTR(header_digest, ISCSI_PARAM_HDRDGST_EN); | |
1158 | SETUP_CONN_RD_ATTR(data_digest, ISCSI_PARAM_DATADGST_EN); | |
1159 | SETUP_CONN_RD_ATTR(ifmarker, ISCSI_PARAM_IFMARKER_EN); | |
1160 | SETUP_CONN_RD_ATTR(ofmarker, ISCSI_PARAM_OFMARKER_EN); | |
1161 | ||
1162 | BUG_ON(count > ISCSI_CONN_ATTRS); | |
1163 | priv->conn_attrs[count] = NULL; | |
1da177e4 | 1164 | count = 0; |
1da177e4 | 1165 | |
0896b752 AA |
1166 | /* session parameters */ |
1167 | priv->session_cont.ac.attrs = &priv->session_attrs[0]; | |
1168 | priv->session_cont.ac.class = &iscsi_session_class.class; | |
1169 | priv->session_cont.ac.match = iscsi_session_match; | |
1170 | transport_container_register(&priv->session_cont); | |
1171 | ||
1172 | SETUP_SESSION_RD_ATTR(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN); | |
1173 | SETUP_SESSION_RD_ATTR(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T); | |
1174 | SETUP_SESSION_RD_ATTR(immediate_data, ISCSI_PARAM_IMM_DATA_EN); | |
1175 | SETUP_SESSION_RD_ATTR(first_burst_len, ISCSI_PARAM_FIRST_BURST); | |
1176 | SETUP_SESSION_RD_ATTR(max_burst_len, ISCSI_PARAM_MAX_BURST); | |
1177 | SETUP_SESSION_RD_ATTR(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN); | |
1178 | SETUP_SESSION_RD_ATTR(data_seq_in_order,ISCSI_PARAM_DATASEQ_INORDER_EN) | |
1179 | SETUP_SESSION_RD_ATTR(erl, ISCSI_PARAM_ERL); | |
1180 | ||
1181 | BUG_ON(count > ISCSI_SESSION_ATTRS); | |
1182 | priv->session_attrs[count] = NULL; | |
1183 | ||
1184 | spin_lock_irqsave(&iscsi_transport_lock, flags); | |
1185 | list_add(&priv->list, &iscsi_transports); | |
1186 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
1187 | ||
1188 | printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name); | |
7b8631b5 | 1189 | return &priv->t; |
1da177e4 | 1190 | |
0896b752 AA |
1191 | unregister_cdev: |
1192 | class_device_unregister(&priv->cdev); | |
1193 | free_priv: | |
1194 | kfree(priv); | |
7b8631b5 | 1195 | return NULL; |
1da177e4 | 1196 | } |
0896b752 AA |
1197 | EXPORT_SYMBOL_GPL(iscsi_register_transport); |
1198 | ||
1199 | int iscsi_unregister_transport(struct iscsi_transport *tt) | |
1200 | { | |
1201 | struct iscsi_internal *priv; | |
1202 | unsigned long flags; | |
1203 | ||
1204 | BUG_ON(!tt); | |
1205 | ||
0b950672 | 1206 | mutex_lock(&rx_queue_mutex); |
0896b752 AA |
1207 | |
1208 | priv = iscsi_if_transport_lookup(tt); | |
1209 | BUG_ON (!priv); | |
1210 | ||
0896b752 AA |
1211 | spin_lock_irqsave(&iscsi_transport_lock, flags); |
1212 | list_del(&priv->list); | |
1213 | spin_unlock_irqrestore(&iscsi_transport_lock, flags); | |
1214 | ||
1215 | transport_container_unregister(&priv->conn_cont); | |
1216 | transport_container_unregister(&priv->session_cont); | |
1217 | ||
1218 | sysfs_remove_group(&priv->cdev.kobj, &iscsi_transport_group); | |
1219 | class_device_unregister(&priv->cdev); | |
0b950672 | 1220 | mutex_unlock(&rx_queue_mutex); |
1da177e4 | 1221 | |
0896b752 AA |
1222 | return 0; |
1223 | } | |
1224 | EXPORT_SYMBOL_GPL(iscsi_unregister_transport); | |
1da177e4 | 1225 | |
0896b752 AA |
1226 | static int |
1227 | iscsi_rcv_nl_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1da177e4 | 1228 | { |
0896b752 AA |
1229 | struct netlink_notify *n = ptr; |
1230 | ||
1231 | if (event == NETLINK_URELEASE && | |
1232 | n->protocol == NETLINK_ISCSI && n->pid) { | |
7b8631b5 | 1233 | struct iscsi_cls_conn *conn; |
0896b752 AA |
1234 | unsigned long flags; |
1235 | ||
7b8631b5 | 1236 | mempool_zone_complete(z_reply); |
0896b752 AA |
1237 | spin_lock_irqsave(&connlock, flags); |
1238 | list_for_each_entry(conn, &connlist, conn_list) { | |
7b8631b5 MC |
1239 | mempool_zone_complete(conn->z_error); |
1240 | mempool_zone_complete(conn->z_pdu); | |
0896b752 AA |
1241 | } |
1242 | spin_unlock_irqrestore(&connlock, flags); | |
1243 | } | |
1da177e4 | 1244 | |
0896b752 | 1245 | return NOTIFY_DONE; |
1da177e4 LT |
1246 | } |
1247 | ||
0896b752 AA |
1248 | static struct notifier_block iscsi_nl_notifier = { |
1249 | .notifier_call = iscsi_rcv_nl_event, | |
1250 | }; | |
1da177e4 LT |
1251 | |
1252 | static __init int iscsi_transport_init(void) | |
1253 | { | |
0896b752 | 1254 | int err; |
1da177e4 | 1255 | |
0896b752 | 1256 | err = class_register(&iscsi_transport_class); |
1da177e4 LT |
1257 | if (err) |
1258 | return err; | |
0896b752 AA |
1259 | |
1260 | err = transport_class_register(&iscsi_connection_class); | |
1261 | if (err) | |
1262 | goto unregister_transport_class; | |
1263 | ||
1264 | err = transport_class_register(&iscsi_session_class); | |
1265 | if (err) | |
1266 | goto unregister_conn_class; | |
1267 | ||
1268 | err = netlink_register_notifier(&iscsi_nl_notifier); | |
1269 | if (err) | |
1270 | goto unregister_session_class; | |
1271 | ||
2290d2b6 | 1272 | nls = netlink_kernel_create(NETLINK_ISCSI, 1, iscsi_if_rx, |
7b8631b5 | 1273 | THIS_MODULE); |
0896b752 AA |
1274 | if (!nls) { |
1275 | err = -ENOBUFS; | |
1276 | goto unregister_notifier; | |
1277 | } | |
1278 | ||
7b8631b5 | 1279 | z_reply = mempool_zone_init(Z_MAX_REPLY, |
0896b752 | 1280 | NLMSG_SPACE(sizeof(struct iscsi_uevent)), Z_HIWAT_REPLY); |
7b8631b5 | 1281 | if (z_reply) |
0896b752 AA |
1282 | return 0; |
1283 | ||
1284 | sock_release(nls->sk_socket); | |
1285 | unregister_notifier: | |
1286 | netlink_unregister_notifier(&iscsi_nl_notifier); | |
1287 | unregister_session_class: | |
1288 | transport_class_unregister(&iscsi_session_class); | |
1289 | unregister_conn_class: | |
1290 | transport_class_unregister(&iscsi_connection_class); | |
1291 | unregister_transport_class: | |
1292 | class_unregister(&iscsi_transport_class); | |
1293 | return err; | |
1da177e4 LT |
1294 | } |
1295 | ||
1296 | static void __exit iscsi_transport_exit(void) | |
1297 | { | |
7b8631b5 | 1298 | mempool_zone_destroy(z_reply); |
0896b752 AA |
1299 | sock_release(nls->sk_socket); |
1300 | netlink_unregister_notifier(&iscsi_nl_notifier); | |
1301 | transport_class_unregister(&iscsi_connection_class); | |
1302 | transport_class_unregister(&iscsi_session_class); | |
1303 | class_unregister(&iscsi_transport_class); | |
1da177e4 LT |
1304 | } |
1305 | ||
1306 | module_init(iscsi_transport_init); | |
1307 | module_exit(iscsi_transport_exit); | |
1308 | ||
0896b752 AA |
1309 | MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, " |
1310 | "Dmitry Yusupov <dmitry_yus@yahoo.com>, " | |
1311 | "Alex Aizman <itn780@yahoo.com>"); | |
1312 | MODULE_DESCRIPTION("iSCSI Transport Interface"); | |
1da177e4 | 1313 | MODULE_LICENSE("GPL"); |