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922a8e9f TT |
1 | /* |
2 | * Copyright (c) 2004, 2005 Intel Corporation. All rights reserved. | |
3 | * Copyright (c) 2004 Topspin Corporation. All rights reserved. | |
4 | * Copyright (c) 2004, 2005 Voltaire Corporation. All rights reserved. | |
5 | * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved. | |
6 | * Copyright (c) 2005 Open Grid Computing, Inc. All rights reserved. | |
7 | * Copyright (c) 2005 Network Appliance, Inc. All rights reserved. | |
8 | * | |
9 | * This software is available to you under a choice of one of two | |
10 | * licenses. You may choose to be licensed under the terms of the GNU | |
11 | * General Public License (GPL) Version 2, available from the file | |
12 | * COPYING in the main directory of this source tree, or the | |
13 | * OpenIB.org BSD license below: | |
14 | * | |
15 | * Redistribution and use in source and binary forms, with or | |
16 | * without modification, are permitted provided that the following | |
17 | * conditions are met: | |
18 | * | |
19 | * - Redistributions of source code must retain the above | |
20 | * copyright notice, this list of conditions and the following | |
21 | * disclaimer. | |
22 | * | |
23 | * - Redistributions in binary form must reproduce the above | |
24 | * copyright notice, this list of conditions and the following | |
25 | * disclaimer in the documentation and/or other materials | |
26 | * provided with the distribution. | |
27 | * | |
28 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
29 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
30 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
31 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
32 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
33 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
34 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
35 | * SOFTWARE. | |
36 | * | |
37 | */ | |
38 | #include <linux/dma-mapping.h> | |
39 | #include <linux/err.h> | |
40 | #include <linux/idr.h> | |
41 | #include <linux/interrupt.h> | |
922a8e9f | 42 | #include <linux/rbtree.h> |
d43c36dc | 43 | #include <linux/sched.h> |
922a8e9f TT |
44 | #include <linux/spinlock.h> |
45 | #include <linux/workqueue.h> | |
46 | #include <linux/completion.h> | |
5a0e3ad6 | 47 | #include <linux/slab.h> |
922a8e9f TT |
48 | |
49 | #include <rdma/iw_cm.h> | |
50 | #include <rdma/ib_addr.h> | |
51 | ||
52 | #include "iwcm.h" | |
53 | ||
54 | MODULE_AUTHOR("Tom Tucker"); | |
55 | MODULE_DESCRIPTION("iWARP CM"); | |
56 | MODULE_LICENSE("Dual BSD/GPL"); | |
57 | ||
58 | static struct workqueue_struct *iwcm_wq; | |
59 | struct iwcm_work { | |
60 | struct work_struct work; | |
61 | struct iwcm_id_private *cm_id; | |
62 | struct list_head list; | |
63 | struct iw_cm_event event; | |
64 | struct list_head free_list; | |
65 | }; | |
66 | ||
67 | /* | |
68 | * The following services provide a mechanism for pre-allocating iwcm_work | |
69 | * elements. The design pre-allocates them based on the cm_id type: | |
70 | * LISTENING IDS: Get enough elements preallocated to handle the | |
71 | * listen backlog. | |
72 | * ACTIVE IDS: 4: CONNECT_REPLY, ESTABLISHED, DISCONNECT, CLOSE | |
73 | * PASSIVE IDS: 3: ESTABLISHED, DISCONNECT, CLOSE | |
74 | * | |
75 | * Allocating them in connect and listen avoids having to deal | |
76 | * with allocation failures on the event upcall from the provider (which | |
77 | * is called in the interrupt context). | |
78 | * | |
79 | * One exception is when creating the cm_id for incoming connection requests. | |
80 | * There are two cases: | |
81 | * 1) in the event upcall, cm_event_handler(), for a listening cm_id. If | |
82 | * the backlog is exceeded, then no more connection request events will | |
83 | * be processed. cm_event_handler() returns -ENOMEM in this case. Its up | |
715a588f | 84 | * to the provider to reject the connection request. |
922a8e9f TT |
85 | * 2) in the connection request workqueue handler, cm_conn_req_handler(). |
86 | * If work elements cannot be allocated for the new connect request cm_id, | |
87 | * then IWCM will call the provider reject method. This is ok since | |
88 | * cm_conn_req_handler() runs in the workqueue thread context. | |
89 | */ | |
90 | ||
91 | static struct iwcm_work *get_work(struct iwcm_id_private *cm_id_priv) | |
92 | { | |
93 | struct iwcm_work *work; | |
94 | ||
95 | if (list_empty(&cm_id_priv->work_free_list)) | |
96 | return NULL; | |
97 | work = list_entry(cm_id_priv->work_free_list.next, struct iwcm_work, | |
98 | free_list); | |
99 | list_del_init(&work->free_list); | |
100 | return work; | |
101 | } | |
102 | ||
103 | static void put_work(struct iwcm_work *work) | |
104 | { | |
105 | list_add(&work->free_list, &work->cm_id->work_free_list); | |
106 | } | |
107 | ||
108 | static void dealloc_work_entries(struct iwcm_id_private *cm_id_priv) | |
109 | { | |
110 | struct list_head *e, *tmp; | |
111 | ||
112 | list_for_each_safe(e, tmp, &cm_id_priv->work_free_list) | |
113 | kfree(list_entry(e, struct iwcm_work, free_list)); | |
114 | } | |
115 | ||
116 | static int alloc_work_entries(struct iwcm_id_private *cm_id_priv, int count) | |
117 | { | |
118 | struct iwcm_work *work; | |
119 | ||
120 | BUG_ON(!list_empty(&cm_id_priv->work_free_list)); | |
121 | while (count--) { | |
122 | work = kmalloc(sizeof(struct iwcm_work), GFP_KERNEL); | |
123 | if (!work) { | |
124 | dealloc_work_entries(cm_id_priv); | |
125 | return -ENOMEM; | |
126 | } | |
127 | work->cm_id = cm_id_priv; | |
128 | INIT_LIST_HEAD(&work->list); | |
129 | put_work(work); | |
130 | } | |
131 | return 0; | |
132 | } | |
133 | ||
134 | /* | |
715a588f KK |
135 | * Save private data from incoming connection requests to |
136 | * iw_cm_event, so the low level driver doesn't have to. Adjust | |
922a8e9f TT |
137 | * the event ptr to point to the local copy. |
138 | */ | |
715a588f | 139 | static int copy_private_data(struct iw_cm_event *event) |
922a8e9f TT |
140 | { |
141 | void *p; | |
142 | ||
bed8bdfd | 143 | p = kmemdup(event->private_data, event->private_data_len, GFP_ATOMIC); |
922a8e9f TT |
144 | if (!p) |
145 | return -ENOMEM; | |
922a8e9f TT |
146 | event->private_data = p; |
147 | return 0; | |
148 | } | |
149 | ||
ebb90986 SW |
150 | static void free_cm_id(struct iwcm_id_private *cm_id_priv) |
151 | { | |
152 | dealloc_work_entries(cm_id_priv); | |
153 | kfree(cm_id_priv); | |
154 | } | |
155 | ||
922a8e9f | 156 | /* |
9ab1ffa8 KK |
157 | * Release a reference on cm_id. If the last reference is being |
158 | * released, enable the waiting thread (in iw_destroy_cm_id) to | |
159 | * get woken up, and return 1 if a thread is already waiting. | |
922a8e9f TT |
160 | */ |
161 | static int iwcm_deref_id(struct iwcm_id_private *cm_id_priv) | |
162 | { | |
922a8e9f TT |
163 | BUG_ON(atomic_read(&cm_id_priv->refcount)==0); |
164 | if (atomic_dec_and_test(&cm_id_priv->refcount)) { | |
165 | BUG_ON(!list_empty(&cm_id_priv->work_list)); | |
922a8e9f | 166 | complete(&cm_id_priv->destroy_comp); |
ebb90986 | 167 | return 1; |
922a8e9f TT |
168 | } |
169 | ||
ebb90986 | 170 | return 0; |
922a8e9f TT |
171 | } |
172 | ||
173 | static void add_ref(struct iw_cm_id *cm_id) | |
174 | { | |
175 | struct iwcm_id_private *cm_id_priv; | |
176 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
177 | atomic_inc(&cm_id_priv->refcount); | |
178 | } | |
179 | ||
180 | static void rem_ref(struct iw_cm_id *cm_id) | |
181 | { | |
182 | struct iwcm_id_private *cm_id_priv; | |
183 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
ebb90986 SW |
184 | if (iwcm_deref_id(cm_id_priv) && |
185 | test_bit(IWCM_F_CALLBACK_DESTROY, &cm_id_priv->flags)) { | |
186 | BUG_ON(!list_empty(&cm_id_priv->work_list)); | |
187 | free_cm_id(cm_id_priv); | |
188 | } | |
922a8e9f TT |
189 | } |
190 | ||
191 | static int cm_event_handler(struct iw_cm_id *cm_id, struct iw_cm_event *event); | |
192 | ||
193 | struct iw_cm_id *iw_create_cm_id(struct ib_device *device, | |
194 | iw_cm_handler cm_handler, | |
195 | void *context) | |
196 | { | |
197 | struct iwcm_id_private *cm_id_priv; | |
198 | ||
199 | cm_id_priv = kzalloc(sizeof(*cm_id_priv), GFP_KERNEL); | |
200 | if (!cm_id_priv) | |
201 | return ERR_PTR(-ENOMEM); | |
202 | ||
203 | cm_id_priv->state = IW_CM_STATE_IDLE; | |
204 | cm_id_priv->id.device = device; | |
205 | cm_id_priv->id.cm_handler = cm_handler; | |
206 | cm_id_priv->id.context = context; | |
207 | cm_id_priv->id.event_handler = cm_event_handler; | |
208 | cm_id_priv->id.add_ref = add_ref; | |
209 | cm_id_priv->id.rem_ref = rem_ref; | |
210 | spin_lock_init(&cm_id_priv->lock); | |
211 | atomic_set(&cm_id_priv->refcount, 1); | |
212 | init_waitqueue_head(&cm_id_priv->connect_wait); | |
213 | init_completion(&cm_id_priv->destroy_comp); | |
214 | INIT_LIST_HEAD(&cm_id_priv->work_list); | |
215 | INIT_LIST_HEAD(&cm_id_priv->work_free_list); | |
216 | ||
217 | return &cm_id_priv->id; | |
218 | } | |
219 | EXPORT_SYMBOL(iw_create_cm_id); | |
220 | ||
221 | ||
222 | static int iwcm_modify_qp_err(struct ib_qp *qp) | |
223 | { | |
224 | struct ib_qp_attr qp_attr; | |
225 | ||
226 | if (!qp) | |
227 | return -EINVAL; | |
228 | ||
229 | qp_attr.qp_state = IB_QPS_ERR; | |
230 | return ib_modify_qp(qp, &qp_attr, IB_QP_STATE); | |
231 | } | |
232 | ||
233 | /* | |
234 | * This is really the RDMAC CLOSING state. It is most similar to the | |
235 | * IB SQD QP state. | |
236 | */ | |
237 | static int iwcm_modify_qp_sqd(struct ib_qp *qp) | |
238 | { | |
239 | struct ib_qp_attr qp_attr; | |
240 | ||
241 | BUG_ON(qp == NULL); | |
242 | qp_attr.qp_state = IB_QPS_SQD; | |
243 | return ib_modify_qp(qp, &qp_attr, IB_QP_STATE); | |
244 | } | |
245 | ||
246 | /* | |
247 | * CM_ID <-- CLOSING | |
248 | * | |
715a588f | 249 | * Block if a passive or active connection is currently being processed. Then |
922a8e9f TT |
250 | * process the event as follows: |
251 | * - If we are ESTABLISHED, move to CLOSING and modify the QP state | |
252 | * based on the abrupt flag | |
253 | * - If the connection is already in the CLOSING or IDLE state, the peer is | |
254 | * disconnecting concurrently with us and we've already seen the | |
255 | * DISCONNECT event -- ignore the request and return 0 | |
256 | * - Disconnect on a listening endpoint returns -EINVAL | |
257 | */ | |
258 | int iw_cm_disconnect(struct iw_cm_id *cm_id, int abrupt) | |
259 | { | |
260 | struct iwcm_id_private *cm_id_priv; | |
261 | unsigned long flags; | |
262 | int ret = 0; | |
263 | struct ib_qp *qp = NULL; | |
264 | ||
265 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
266 | /* Wait if we're currently in a connect or accept downcall */ | |
267 | wait_event(cm_id_priv->connect_wait, | |
268 | !test_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags)); | |
269 | ||
270 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
271 | switch (cm_id_priv->state) { | |
272 | case IW_CM_STATE_ESTABLISHED: | |
273 | cm_id_priv->state = IW_CM_STATE_CLOSING; | |
274 | ||
275 | /* QP could be <nul> for user-mode client */ | |
276 | if (cm_id_priv->qp) | |
277 | qp = cm_id_priv->qp; | |
278 | else | |
279 | ret = -EINVAL; | |
280 | break; | |
281 | case IW_CM_STATE_LISTEN: | |
282 | ret = -EINVAL; | |
283 | break; | |
284 | case IW_CM_STATE_CLOSING: | |
285 | /* remote peer closed first */ | |
286 | case IW_CM_STATE_IDLE: | |
287 | /* accept or connect returned !0 */ | |
288 | break; | |
289 | case IW_CM_STATE_CONN_RECV: | |
290 | /* | |
291 | * App called disconnect before/without calling accept after | |
292 | * connect_request event delivered. | |
293 | */ | |
294 | break; | |
295 | case IW_CM_STATE_CONN_SENT: | |
296 | /* Can only get here if wait above fails */ | |
297 | default: | |
298 | BUG(); | |
299 | } | |
300 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
301 | ||
302 | if (qp) { | |
303 | if (abrupt) | |
304 | ret = iwcm_modify_qp_err(qp); | |
305 | else | |
306 | ret = iwcm_modify_qp_sqd(qp); | |
307 | ||
308 | /* | |
309 | * If both sides are disconnecting the QP could | |
310 | * already be in ERR or SQD states | |
311 | */ | |
312 | ret = 0; | |
313 | } | |
314 | ||
315 | return ret; | |
316 | } | |
317 | EXPORT_SYMBOL(iw_cm_disconnect); | |
318 | ||
319 | /* | |
320 | * CM_ID <-- DESTROYING | |
321 | * | |
322 | * Clean up all resources associated with the connection and release | |
323 | * the initial reference taken by iw_create_cm_id. | |
324 | */ | |
325 | static void destroy_cm_id(struct iw_cm_id *cm_id) | |
326 | { | |
327 | struct iwcm_id_private *cm_id_priv; | |
328 | unsigned long flags; | |
329 | int ret; | |
330 | ||
331 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
332 | /* | |
333 | * Wait if we're currently in a connect or accept downcall. A | |
334 | * listening endpoint should never block here. | |
335 | */ | |
336 | wait_event(cm_id_priv->connect_wait, | |
337 | !test_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags)); | |
338 | ||
339 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
340 | switch (cm_id_priv->state) { | |
341 | case IW_CM_STATE_LISTEN: | |
342 | cm_id_priv->state = IW_CM_STATE_DESTROYING; | |
343 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
344 | /* destroy the listening endpoint */ | |
345 | ret = cm_id->device->iwcm->destroy_listen(cm_id); | |
346 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
347 | break; | |
348 | case IW_CM_STATE_ESTABLISHED: | |
349 | cm_id_priv->state = IW_CM_STATE_DESTROYING; | |
350 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
351 | /* Abrupt close of the connection */ | |
352 | (void)iwcm_modify_qp_err(cm_id_priv->qp); | |
353 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
354 | break; | |
355 | case IW_CM_STATE_IDLE: | |
356 | case IW_CM_STATE_CLOSING: | |
357 | cm_id_priv->state = IW_CM_STATE_DESTROYING; | |
358 | break; | |
359 | case IW_CM_STATE_CONN_RECV: | |
360 | /* | |
361 | * App called destroy before/without calling accept after | |
ebb90986 SW |
362 | * receiving connection request event notification or |
363 | * returned non zero from the event callback function. | |
364 | * In either case, must tell the provider to reject. | |
922a8e9f TT |
365 | */ |
366 | cm_id_priv->state = IW_CM_STATE_DESTROYING; | |
54e05f15 | 367 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); |
cb58160e | 368 | cm_id->device->iwcm->reject(cm_id, NULL, 0); |
54e05f15 | 369 | spin_lock_irqsave(&cm_id_priv->lock, flags); |
922a8e9f TT |
370 | break; |
371 | case IW_CM_STATE_CONN_SENT: | |
372 | case IW_CM_STATE_DESTROYING: | |
373 | default: | |
374 | BUG(); | |
375 | break; | |
376 | } | |
377 | if (cm_id_priv->qp) { | |
378 | cm_id_priv->id.device->iwcm->rem_ref(cm_id_priv->qp); | |
379 | cm_id_priv->qp = NULL; | |
380 | } | |
381 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
382 | ||
383 | (void)iwcm_deref_id(cm_id_priv); | |
384 | } | |
385 | ||
386 | /* | |
387 | * This function is only called by the application thread and cannot | |
388 | * be called by the event thread. The function will wait for all | |
389 | * references to be released on the cm_id and then kfree the cm_id | |
390 | * object. | |
391 | */ | |
392 | void iw_destroy_cm_id(struct iw_cm_id *cm_id) | |
393 | { | |
394 | struct iwcm_id_private *cm_id_priv; | |
395 | ||
396 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
397 | BUG_ON(test_bit(IWCM_F_CALLBACK_DESTROY, &cm_id_priv->flags)); | |
398 | ||
399 | destroy_cm_id(cm_id); | |
400 | ||
401 | wait_for_completion(&cm_id_priv->destroy_comp); | |
402 | ||
ebb90986 | 403 | free_cm_id(cm_id_priv); |
922a8e9f TT |
404 | } |
405 | EXPORT_SYMBOL(iw_destroy_cm_id); | |
406 | ||
407 | /* | |
408 | * CM_ID <-- LISTEN | |
409 | * | |
410 | * Start listening for connect requests. Generates one CONNECT_REQUEST | |
411 | * event for each inbound connect request. | |
412 | */ | |
413 | int iw_cm_listen(struct iw_cm_id *cm_id, int backlog) | |
414 | { | |
415 | struct iwcm_id_private *cm_id_priv; | |
416 | unsigned long flags; | |
13fccdb3 | 417 | int ret; |
922a8e9f TT |
418 | |
419 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
420 | ||
421 | ret = alloc_work_entries(cm_id_priv, backlog); | |
422 | if (ret) | |
423 | return ret; | |
424 | ||
425 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
426 | switch (cm_id_priv->state) { | |
427 | case IW_CM_STATE_IDLE: | |
428 | cm_id_priv->state = IW_CM_STATE_LISTEN; | |
429 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
430 | ret = cm_id->device->iwcm->create_listen(cm_id, backlog); | |
431 | if (ret) | |
432 | cm_id_priv->state = IW_CM_STATE_IDLE; | |
433 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
434 | break; | |
435 | default: | |
436 | ret = -EINVAL; | |
437 | } | |
438 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
439 | ||
440 | return ret; | |
441 | } | |
442 | EXPORT_SYMBOL(iw_cm_listen); | |
443 | ||
444 | /* | |
445 | * CM_ID <-- IDLE | |
446 | * | |
447 | * Rejects an inbound connection request. No events are generated. | |
448 | */ | |
449 | int iw_cm_reject(struct iw_cm_id *cm_id, | |
450 | const void *private_data, | |
451 | u8 private_data_len) | |
452 | { | |
453 | struct iwcm_id_private *cm_id_priv; | |
454 | unsigned long flags; | |
455 | int ret; | |
456 | ||
457 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
458 | set_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); | |
459 | ||
460 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
461 | if (cm_id_priv->state != IW_CM_STATE_CONN_RECV) { | |
462 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
463 | clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); | |
464 | wake_up_all(&cm_id_priv->connect_wait); | |
465 | return -EINVAL; | |
466 | } | |
467 | cm_id_priv->state = IW_CM_STATE_IDLE; | |
468 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
469 | ||
470 | ret = cm_id->device->iwcm->reject(cm_id, private_data, | |
471 | private_data_len); | |
472 | ||
473 | clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); | |
474 | wake_up_all(&cm_id_priv->connect_wait); | |
475 | ||
476 | return ret; | |
477 | } | |
478 | EXPORT_SYMBOL(iw_cm_reject); | |
479 | ||
480 | /* | |
481 | * CM_ID <-- ESTABLISHED | |
482 | * | |
483 | * Accepts an inbound connection request and generates an ESTABLISHED | |
484 | * event. Callers of iw_cm_disconnect and iw_destroy_cm_id will block | |
485 | * until the ESTABLISHED event is received from the provider. | |
486 | */ | |
487 | int iw_cm_accept(struct iw_cm_id *cm_id, | |
488 | struct iw_cm_conn_param *iw_param) | |
489 | { | |
490 | struct iwcm_id_private *cm_id_priv; | |
491 | struct ib_qp *qp; | |
492 | unsigned long flags; | |
493 | int ret; | |
494 | ||
495 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
496 | set_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); | |
497 | ||
498 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
499 | if (cm_id_priv->state != IW_CM_STATE_CONN_RECV) { | |
500 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
501 | clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); | |
502 | wake_up_all(&cm_id_priv->connect_wait); | |
503 | return -EINVAL; | |
504 | } | |
505 | /* Get the ib_qp given the QPN */ | |
506 | qp = cm_id->device->iwcm->get_qp(cm_id->device, iw_param->qpn); | |
507 | if (!qp) { | |
508 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
509 | return -EINVAL; | |
510 | } | |
511 | cm_id->device->iwcm->add_ref(qp); | |
512 | cm_id_priv->qp = qp; | |
513 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
514 | ||
515 | ret = cm_id->device->iwcm->accept(cm_id, iw_param); | |
516 | if (ret) { | |
517 | /* An error on accept precludes provider events */ | |
518 | BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_RECV); | |
519 | cm_id_priv->state = IW_CM_STATE_IDLE; | |
520 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
521 | if (cm_id_priv->qp) { | |
522 | cm_id->device->iwcm->rem_ref(qp); | |
523 | cm_id_priv->qp = NULL; | |
524 | } | |
525 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
526 | clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); | |
527 | wake_up_all(&cm_id_priv->connect_wait); | |
528 | } | |
529 | ||
530 | return ret; | |
531 | } | |
532 | EXPORT_SYMBOL(iw_cm_accept); | |
533 | ||
534 | /* | |
535 | * Active Side: CM_ID <-- CONN_SENT | |
536 | * | |
537 | * If successful, results in the generation of a CONNECT_REPLY | |
538 | * event. iw_cm_disconnect and iw_cm_destroy will block until the | |
539 | * CONNECT_REPLY event is received from the provider. | |
540 | */ | |
541 | int iw_cm_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *iw_param) | |
542 | { | |
543 | struct iwcm_id_private *cm_id_priv; | |
13fccdb3 | 544 | int ret; |
922a8e9f TT |
545 | unsigned long flags; |
546 | struct ib_qp *qp; | |
547 | ||
548 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
549 | ||
550 | ret = alloc_work_entries(cm_id_priv, 4); | |
551 | if (ret) | |
552 | return ret; | |
553 | ||
554 | set_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); | |
555 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
556 | ||
557 | if (cm_id_priv->state != IW_CM_STATE_IDLE) { | |
558 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
559 | clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); | |
560 | wake_up_all(&cm_id_priv->connect_wait); | |
561 | return -EINVAL; | |
562 | } | |
563 | ||
564 | /* Get the ib_qp given the QPN */ | |
565 | qp = cm_id->device->iwcm->get_qp(cm_id->device, iw_param->qpn); | |
566 | if (!qp) { | |
567 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
568 | return -EINVAL; | |
569 | } | |
570 | cm_id->device->iwcm->add_ref(qp); | |
571 | cm_id_priv->qp = qp; | |
572 | cm_id_priv->state = IW_CM_STATE_CONN_SENT; | |
573 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
574 | ||
575 | ret = cm_id->device->iwcm->connect(cm_id, iw_param); | |
576 | if (ret) { | |
577 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
578 | if (cm_id_priv->qp) { | |
579 | cm_id->device->iwcm->rem_ref(qp); | |
580 | cm_id_priv->qp = NULL; | |
581 | } | |
582 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
583 | BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_SENT); | |
584 | cm_id_priv->state = IW_CM_STATE_IDLE; | |
585 | clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); | |
586 | wake_up_all(&cm_id_priv->connect_wait); | |
587 | } | |
588 | ||
589 | return ret; | |
590 | } | |
591 | EXPORT_SYMBOL(iw_cm_connect); | |
592 | ||
593 | /* | |
594 | * Passive Side: new CM_ID <-- CONN_RECV | |
595 | * | |
596 | * Handles an inbound connect request. The function creates a new | |
597 | * iw_cm_id to represent the new connection and inherits the client | |
598 | * callback function and other attributes from the listening parent. | |
599 | * | |
600 | * The work item contains a pointer to the listen_cm_id and the event. The | |
601 | * listen_cm_id contains the client cm_handler, context and | |
602 | * device. These are copied when the device is cloned. The event | |
603 | * contains the new four tuple. | |
604 | * | |
605 | * An error on the child should not affect the parent, so this | |
606 | * function does not return a value. | |
607 | */ | |
608 | static void cm_conn_req_handler(struct iwcm_id_private *listen_id_priv, | |
609 | struct iw_cm_event *iw_event) | |
610 | { | |
611 | unsigned long flags; | |
612 | struct iw_cm_id *cm_id; | |
613 | struct iwcm_id_private *cm_id_priv; | |
614 | int ret; | |
615 | ||
616 | /* | |
617 | * The provider should never generate a connection request | |
618 | * event with a bad status. | |
619 | */ | |
620 | BUG_ON(iw_event->status); | |
621 | ||
622 | /* | |
623 | * We could be destroying the listening id. If so, ignore this | |
624 | * upcall. | |
625 | */ | |
626 | spin_lock_irqsave(&listen_id_priv->lock, flags); | |
627 | if (listen_id_priv->state != IW_CM_STATE_LISTEN) { | |
628 | spin_unlock_irqrestore(&listen_id_priv->lock, flags); | |
83b96586 | 629 | goto out; |
922a8e9f TT |
630 | } |
631 | spin_unlock_irqrestore(&listen_id_priv->lock, flags); | |
632 | ||
633 | cm_id = iw_create_cm_id(listen_id_priv->id.device, | |
634 | listen_id_priv->id.cm_handler, | |
635 | listen_id_priv->id.context); | |
636 | /* If the cm_id could not be created, ignore the request */ | |
637 | if (IS_ERR(cm_id)) | |
83b96586 | 638 | goto out; |
922a8e9f TT |
639 | |
640 | cm_id->provider_data = iw_event->provider_data; | |
641 | cm_id->local_addr = iw_event->local_addr; | |
642 | cm_id->remote_addr = iw_event->remote_addr; | |
643 | ||
644 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
645 | cm_id_priv->state = IW_CM_STATE_CONN_RECV; | |
646 | ||
647 | ret = alloc_work_entries(cm_id_priv, 3); | |
648 | if (ret) { | |
649 | iw_cm_reject(cm_id, NULL, 0); | |
650 | iw_destroy_cm_id(cm_id); | |
83b96586 | 651 | goto out; |
922a8e9f TT |
652 | } |
653 | ||
654 | /* Call the client CM handler */ | |
655 | ret = cm_id->cm_handler(cm_id, iw_event); | |
656 | if (ret) { | |
ebb90986 | 657 | iw_cm_reject(cm_id, NULL, 0); |
922a8e9f TT |
658 | set_bit(IWCM_F_CALLBACK_DESTROY, &cm_id_priv->flags); |
659 | destroy_cm_id(cm_id); | |
660 | if (atomic_read(&cm_id_priv->refcount)==0) | |
ebb90986 | 661 | free_cm_id(cm_id_priv); |
922a8e9f TT |
662 | } |
663 | ||
83b96586 | 664 | out: |
922a8e9f TT |
665 | if (iw_event->private_data_len) |
666 | kfree(iw_event->private_data); | |
667 | } | |
668 | ||
669 | /* | |
670 | * Passive Side: CM_ID <-- ESTABLISHED | |
671 | * | |
672 | * The provider generated an ESTABLISHED event which means that | |
673 | * the MPA negotion has completed successfully and we are now in MPA | |
674 | * FPDU mode. | |
675 | * | |
676 | * This event can only be received in the CONN_RECV state. If the | |
677 | * remote peer closed, the ESTABLISHED event would be received followed | |
678 | * by the CLOSE event. If the app closes, it will block until we wake | |
679 | * it up after processing this event. | |
680 | */ | |
681 | static int cm_conn_est_handler(struct iwcm_id_private *cm_id_priv, | |
682 | struct iw_cm_event *iw_event) | |
683 | { | |
684 | unsigned long flags; | |
13fccdb3 | 685 | int ret; |
922a8e9f TT |
686 | |
687 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
688 | ||
689 | /* | |
690 | * We clear the CONNECT_WAIT bit here to allow the callback | |
691 | * function to call iw_cm_disconnect. Calling iw_destroy_cm_id | |
692 | * from a callback handler is not allowed. | |
693 | */ | |
694 | clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); | |
695 | BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_RECV); | |
696 | cm_id_priv->state = IW_CM_STATE_ESTABLISHED; | |
697 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
698 | ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event); | |
699 | wake_up_all(&cm_id_priv->connect_wait); | |
700 | ||
701 | return ret; | |
702 | } | |
703 | ||
704 | /* | |
705 | * Active Side: CM_ID <-- ESTABLISHED | |
706 | * | |
707 | * The app has called connect and is waiting for the established event to | |
708 | * post it's requests to the server. This event will wake up anyone | |
709 | * blocked in iw_cm_disconnect or iw_destroy_id. | |
710 | */ | |
711 | static int cm_conn_rep_handler(struct iwcm_id_private *cm_id_priv, | |
712 | struct iw_cm_event *iw_event) | |
713 | { | |
714 | unsigned long flags; | |
13fccdb3 | 715 | int ret; |
922a8e9f TT |
716 | |
717 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
718 | /* | |
719 | * Clear the connect wait bit so a callback function calling | |
720 | * iw_cm_disconnect will not wait and deadlock this thread | |
721 | */ | |
722 | clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); | |
723 | BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_SENT); | |
724 | if (iw_event->status == IW_CM_EVENT_STATUS_ACCEPTED) { | |
725 | cm_id_priv->id.local_addr = iw_event->local_addr; | |
726 | cm_id_priv->id.remote_addr = iw_event->remote_addr; | |
727 | cm_id_priv->state = IW_CM_STATE_ESTABLISHED; | |
728 | } else { | |
729 | /* REJECTED or RESET */ | |
730 | cm_id_priv->id.device->iwcm->rem_ref(cm_id_priv->qp); | |
731 | cm_id_priv->qp = NULL; | |
732 | cm_id_priv->state = IW_CM_STATE_IDLE; | |
733 | } | |
734 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
735 | ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event); | |
736 | ||
737 | if (iw_event->private_data_len) | |
738 | kfree(iw_event->private_data); | |
739 | ||
740 | /* Wake up waiters on connect complete */ | |
741 | wake_up_all(&cm_id_priv->connect_wait); | |
742 | ||
743 | return ret; | |
744 | } | |
745 | ||
746 | /* | |
747 | * CM_ID <-- CLOSING | |
748 | * | |
749 | * If in the ESTABLISHED state, move to CLOSING. | |
750 | */ | |
751 | static void cm_disconnect_handler(struct iwcm_id_private *cm_id_priv, | |
752 | struct iw_cm_event *iw_event) | |
753 | { | |
754 | unsigned long flags; | |
755 | ||
756 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
757 | if (cm_id_priv->state == IW_CM_STATE_ESTABLISHED) | |
758 | cm_id_priv->state = IW_CM_STATE_CLOSING; | |
759 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
760 | } | |
761 | ||
762 | /* | |
763 | * CM_ID <-- IDLE | |
764 | * | |
765 | * If in the ESTBLISHED or CLOSING states, the QP will have have been | |
766 | * moved by the provider to the ERR state. Disassociate the CM_ID from | |
767 | * the QP, move to IDLE, and remove the 'connected' reference. | |
768 | * | |
769 | * If in some other state, the cm_id was destroyed asynchronously. | |
770 | * This is the last reference that will result in waking up | |
771 | * the app thread blocked in iw_destroy_cm_id. | |
772 | */ | |
773 | static int cm_close_handler(struct iwcm_id_private *cm_id_priv, | |
774 | struct iw_cm_event *iw_event) | |
775 | { | |
776 | unsigned long flags; | |
777 | int ret = 0; | |
778 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
779 | ||
780 | if (cm_id_priv->qp) { | |
781 | cm_id_priv->id.device->iwcm->rem_ref(cm_id_priv->qp); | |
782 | cm_id_priv->qp = NULL; | |
783 | } | |
784 | switch (cm_id_priv->state) { | |
785 | case IW_CM_STATE_ESTABLISHED: | |
786 | case IW_CM_STATE_CLOSING: | |
787 | cm_id_priv->state = IW_CM_STATE_IDLE; | |
788 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
789 | ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event); | |
790 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
791 | break; | |
792 | case IW_CM_STATE_DESTROYING: | |
793 | break; | |
794 | default: | |
795 | BUG(); | |
796 | } | |
797 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
798 | ||
799 | return ret; | |
800 | } | |
801 | ||
802 | static int process_event(struct iwcm_id_private *cm_id_priv, | |
803 | struct iw_cm_event *iw_event) | |
804 | { | |
805 | int ret = 0; | |
806 | ||
807 | switch (iw_event->event) { | |
808 | case IW_CM_EVENT_CONNECT_REQUEST: | |
809 | cm_conn_req_handler(cm_id_priv, iw_event); | |
810 | break; | |
811 | case IW_CM_EVENT_CONNECT_REPLY: | |
812 | ret = cm_conn_rep_handler(cm_id_priv, iw_event); | |
813 | break; | |
814 | case IW_CM_EVENT_ESTABLISHED: | |
815 | ret = cm_conn_est_handler(cm_id_priv, iw_event); | |
816 | break; | |
817 | case IW_CM_EVENT_DISCONNECT: | |
818 | cm_disconnect_handler(cm_id_priv, iw_event); | |
819 | break; | |
820 | case IW_CM_EVENT_CLOSE: | |
821 | ret = cm_close_handler(cm_id_priv, iw_event); | |
822 | break; | |
823 | default: | |
824 | BUG(); | |
825 | } | |
826 | ||
827 | return ret; | |
828 | } | |
829 | ||
830 | /* | |
831 | * Process events on the work_list for the cm_id. If the callback | |
832 | * function requests that the cm_id be deleted, a flag is set in the | |
833 | * cm_id flags to indicate that when the last reference is | |
834 | * removed, the cm_id is to be destroyed. This is necessary to | |
835 | * distinguish between an object that will be destroyed by the app | |
836 | * thread asleep on the destroy_comp list vs. an object destroyed | |
837 | * here synchronously when the last reference is removed. | |
838 | */ | |
c4028958 | 839 | static void cm_work_handler(struct work_struct *_work) |
922a8e9f | 840 | { |
4c1ac1b4 | 841 | struct iwcm_work *work = container_of(_work, struct iwcm_work, work); |
33ba0fa9 | 842 | struct iw_cm_event levent; |
922a8e9f TT |
843 | struct iwcm_id_private *cm_id_priv = work->cm_id; |
844 | unsigned long flags; | |
845 | int empty; | |
846 | int ret = 0; | |
d7c1fbd6 | 847 | int destroy_id; |
922a8e9f TT |
848 | |
849 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
850 | empty = list_empty(&cm_id_priv->work_list); | |
851 | while (!empty) { | |
852 | work = list_entry(cm_id_priv->work_list.next, | |
853 | struct iwcm_work, list); | |
854 | list_del_init(&work->list); | |
855 | empty = list_empty(&cm_id_priv->work_list); | |
33ba0fa9 | 856 | levent = work->event; |
922a8e9f TT |
857 | put_work(work); |
858 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
859 | ||
33ba0fa9 | 860 | ret = process_event(cm_id_priv, &levent); |
922a8e9f TT |
861 | if (ret) { |
862 | set_bit(IWCM_F_CALLBACK_DESTROY, &cm_id_priv->flags); | |
863 | destroy_cm_id(&cm_id_priv->id); | |
864 | } | |
865 | BUG_ON(atomic_read(&cm_id_priv->refcount)==0); | |
d7c1fbd6 | 866 | destroy_id = test_bit(IWCM_F_CALLBACK_DESTROY, &cm_id_priv->flags); |
ebb90986 | 867 | if (iwcm_deref_id(cm_id_priv)) { |
d7c1fbd6 | 868 | if (destroy_id) { |
ebb90986 SW |
869 | BUG_ON(!list_empty(&cm_id_priv->work_list)); |
870 | free_cm_id(cm_id_priv); | |
871 | } | |
922a8e9f TT |
872 | return; |
873 | } | |
874 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
875 | } | |
876 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
877 | } | |
878 | ||
879 | /* | |
880 | * This function is called on interrupt context. Schedule events on | |
881 | * the iwcm_wq thread to allow callback functions to downcall into | |
882 | * the CM and/or block. Events are queued to a per-CM_ID | |
883 | * work_list. If this is the first event on the work_list, the work | |
884 | * element is also queued on the iwcm_wq thread. | |
885 | * | |
886 | * Each event holds a reference on the cm_id. Until the last posted | |
887 | * event has been delivered and processed, the cm_id cannot be | |
888 | * deleted. | |
889 | * | |
890 | * Returns: | |
891 | * 0 - the event was handled. | |
892 | * -ENOMEM - the event was not handled due to lack of resources. | |
893 | */ | |
894 | static int cm_event_handler(struct iw_cm_id *cm_id, | |
895 | struct iw_cm_event *iw_event) | |
896 | { | |
897 | struct iwcm_work *work; | |
898 | struct iwcm_id_private *cm_id_priv; | |
899 | unsigned long flags; | |
900 | int ret = 0; | |
901 | ||
902 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
903 | ||
904 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
905 | work = get_work(cm_id_priv); | |
906 | if (!work) { | |
907 | ret = -ENOMEM; | |
908 | goto out; | |
909 | } | |
910 | ||
c4028958 | 911 | INIT_WORK(&work->work, cm_work_handler); |
922a8e9f TT |
912 | work->cm_id = cm_id_priv; |
913 | work->event = *iw_event; | |
914 | ||
915 | if ((work->event.event == IW_CM_EVENT_CONNECT_REQUEST || | |
916 | work->event.event == IW_CM_EVENT_CONNECT_REPLY) && | |
917 | work->event.private_data_len) { | |
715a588f | 918 | ret = copy_private_data(&work->event); |
922a8e9f TT |
919 | if (ret) { |
920 | put_work(work); | |
921 | goto out; | |
922 | } | |
923 | } | |
924 | ||
925 | atomic_inc(&cm_id_priv->refcount); | |
926 | if (list_empty(&cm_id_priv->work_list)) { | |
927 | list_add_tail(&work->list, &cm_id_priv->work_list); | |
928 | queue_work(iwcm_wq, &work->work); | |
929 | } else | |
930 | list_add_tail(&work->list, &cm_id_priv->work_list); | |
931 | out: | |
932 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
933 | return ret; | |
934 | } | |
935 | ||
936 | static int iwcm_init_qp_init_attr(struct iwcm_id_private *cm_id_priv, | |
937 | struct ib_qp_attr *qp_attr, | |
938 | int *qp_attr_mask) | |
939 | { | |
940 | unsigned long flags; | |
941 | int ret; | |
942 | ||
943 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
944 | switch (cm_id_priv->state) { | |
945 | case IW_CM_STATE_IDLE: | |
946 | case IW_CM_STATE_CONN_SENT: | |
947 | case IW_CM_STATE_CONN_RECV: | |
948 | case IW_CM_STATE_ESTABLISHED: | |
949 | *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS; | |
1ca8d156 | 950 | qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE| |
922a8e9f TT |
951 | IB_ACCESS_REMOTE_READ; |
952 | ret = 0; | |
953 | break; | |
954 | default: | |
955 | ret = -EINVAL; | |
956 | break; | |
957 | } | |
958 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
959 | return ret; | |
960 | } | |
961 | ||
962 | static int iwcm_init_qp_rts_attr(struct iwcm_id_private *cm_id_priv, | |
963 | struct ib_qp_attr *qp_attr, | |
964 | int *qp_attr_mask) | |
965 | { | |
966 | unsigned long flags; | |
967 | int ret; | |
968 | ||
969 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
970 | switch (cm_id_priv->state) { | |
971 | case IW_CM_STATE_IDLE: | |
972 | case IW_CM_STATE_CONN_SENT: | |
973 | case IW_CM_STATE_CONN_RECV: | |
974 | case IW_CM_STATE_ESTABLISHED: | |
975 | *qp_attr_mask = 0; | |
976 | ret = 0; | |
977 | break; | |
978 | default: | |
979 | ret = -EINVAL; | |
980 | break; | |
981 | } | |
982 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
983 | return ret; | |
984 | } | |
985 | ||
986 | int iw_cm_init_qp_attr(struct iw_cm_id *cm_id, | |
987 | struct ib_qp_attr *qp_attr, | |
988 | int *qp_attr_mask) | |
989 | { | |
990 | struct iwcm_id_private *cm_id_priv; | |
991 | int ret; | |
992 | ||
993 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
994 | switch (qp_attr->qp_state) { | |
995 | case IB_QPS_INIT: | |
996 | case IB_QPS_RTR: | |
997 | ret = iwcm_init_qp_init_attr(cm_id_priv, | |
998 | qp_attr, qp_attr_mask); | |
999 | break; | |
1000 | case IB_QPS_RTS: | |
1001 | ret = iwcm_init_qp_rts_attr(cm_id_priv, | |
1002 | qp_attr, qp_attr_mask); | |
1003 | break; | |
1004 | default: | |
1005 | ret = -EINVAL; | |
1006 | break; | |
1007 | } | |
1008 | return ret; | |
1009 | } | |
1010 | EXPORT_SYMBOL(iw_cm_init_qp_attr); | |
1011 | ||
1012 | static int __init iw_cm_init(void) | |
1013 | { | |
1014 | iwcm_wq = create_singlethread_workqueue("iw_cm_wq"); | |
1015 | if (!iwcm_wq) | |
1016 | return -ENOMEM; | |
1017 | ||
1018 | return 0; | |
1019 | } | |
1020 | ||
1021 | static void __exit iw_cm_cleanup(void) | |
1022 | { | |
1023 | destroy_workqueue(iwcm_wq); | |
1024 | } | |
1025 | ||
1026 | module_init(iw_cm_init); | |
1027 | module_exit(iw_cm_cleanup); |