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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> |
e4dd23d7 | 48 | #include <linux/module.h> |
922a8e9f TT |
49 | |
50 | #include <rdma/iw_cm.h> | |
51 | #include <rdma/ib_addr.h> | |
52 | ||
53 | #include "iwcm.h" | |
54 | ||
55 | MODULE_AUTHOR("Tom Tucker"); | |
56 | MODULE_DESCRIPTION("iWARP CM"); | |
57 | MODULE_LICENSE("Dual BSD/GPL"); | |
58 | ||
59 | static struct workqueue_struct *iwcm_wq; | |
60 | struct iwcm_work { | |
61 | struct work_struct work; | |
62 | struct iwcm_id_private *cm_id; | |
63 | struct list_head list; | |
64 | struct iw_cm_event event; | |
65 | struct list_head free_list; | |
66 | }; | |
67 | ||
68 | /* | |
69 | * The following services provide a mechanism for pre-allocating iwcm_work | |
70 | * elements. The design pre-allocates them based on the cm_id type: | |
71 | * LISTENING IDS: Get enough elements preallocated to handle the | |
72 | * listen backlog. | |
73 | * ACTIVE IDS: 4: CONNECT_REPLY, ESTABLISHED, DISCONNECT, CLOSE | |
74 | * PASSIVE IDS: 3: ESTABLISHED, DISCONNECT, CLOSE | |
75 | * | |
76 | * Allocating them in connect and listen avoids having to deal | |
77 | * with allocation failures on the event upcall from the provider (which | |
78 | * is called in the interrupt context). | |
79 | * | |
80 | * One exception is when creating the cm_id for incoming connection requests. | |
81 | * There are two cases: | |
82 | * 1) in the event upcall, cm_event_handler(), for a listening cm_id. If | |
83 | * the backlog is exceeded, then no more connection request events will | |
84 | * be processed. cm_event_handler() returns -ENOMEM in this case. Its up | |
715a588f | 85 | * to the provider to reject the connection request. |
922a8e9f TT |
86 | * 2) in the connection request workqueue handler, cm_conn_req_handler(). |
87 | * If work elements cannot be allocated for the new connect request cm_id, | |
88 | * then IWCM will call the provider reject method. This is ok since | |
89 | * cm_conn_req_handler() runs in the workqueue thread context. | |
90 | */ | |
91 | ||
92 | static struct iwcm_work *get_work(struct iwcm_id_private *cm_id_priv) | |
93 | { | |
94 | struct iwcm_work *work; | |
95 | ||
96 | if (list_empty(&cm_id_priv->work_free_list)) | |
97 | return NULL; | |
98 | work = list_entry(cm_id_priv->work_free_list.next, struct iwcm_work, | |
99 | free_list); | |
100 | list_del_init(&work->free_list); | |
101 | return work; | |
102 | } | |
103 | ||
104 | static void put_work(struct iwcm_work *work) | |
105 | { | |
106 | list_add(&work->free_list, &work->cm_id->work_free_list); | |
107 | } | |
108 | ||
109 | static void dealloc_work_entries(struct iwcm_id_private *cm_id_priv) | |
110 | { | |
111 | struct list_head *e, *tmp; | |
112 | ||
113 | list_for_each_safe(e, tmp, &cm_id_priv->work_free_list) | |
114 | kfree(list_entry(e, struct iwcm_work, free_list)); | |
115 | } | |
116 | ||
117 | static int alloc_work_entries(struct iwcm_id_private *cm_id_priv, int count) | |
118 | { | |
119 | struct iwcm_work *work; | |
120 | ||
121 | BUG_ON(!list_empty(&cm_id_priv->work_free_list)); | |
122 | while (count--) { | |
123 | work = kmalloc(sizeof(struct iwcm_work), GFP_KERNEL); | |
124 | if (!work) { | |
125 | dealloc_work_entries(cm_id_priv); | |
126 | return -ENOMEM; | |
127 | } | |
128 | work->cm_id = cm_id_priv; | |
129 | INIT_LIST_HEAD(&work->list); | |
130 | put_work(work); | |
131 | } | |
132 | return 0; | |
133 | } | |
134 | ||
135 | /* | |
715a588f KK |
136 | * Save private data from incoming connection requests to |
137 | * iw_cm_event, so the low level driver doesn't have to. Adjust | |
922a8e9f TT |
138 | * the event ptr to point to the local copy. |
139 | */ | |
715a588f | 140 | static int copy_private_data(struct iw_cm_event *event) |
922a8e9f TT |
141 | { |
142 | void *p; | |
143 | ||
bed8bdfd | 144 | p = kmemdup(event->private_data, event->private_data_len, GFP_ATOMIC); |
922a8e9f TT |
145 | if (!p) |
146 | return -ENOMEM; | |
922a8e9f TT |
147 | event->private_data = p; |
148 | return 0; | |
149 | } | |
150 | ||
ebb90986 SW |
151 | static void free_cm_id(struct iwcm_id_private *cm_id_priv) |
152 | { | |
153 | dealloc_work_entries(cm_id_priv); | |
154 | kfree(cm_id_priv); | |
155 | } | |
156 | ||
922a8e9f | 157 | /* |
9ab1ffa8 KK |
158 | * Release a reference on cm_id. If the last reference is being |
159 | * released, enable the waiting thread (in iw_destroy_cm_id) to | |
160 | * get woken up, and return 1 if a thread is already waiting. | |
922a8e9f TT |
161 | */ |
162 | static int iwcm_deref_id(struct iwcm_id_private *cm_id_priv) | |
163 | { | |
922a8e9f TT |
164 | BUG_ON(atomic_read(&cm_id_priv->refcount)==0); |
165 | if (atomic_dec_and_test(&cm_id_priv->refcount)) { | |
166 | BUG_ON(!list_empty(&cm_id_priv->work_list)); | |
922a8e9f | 167 | complete(&cm_id_priv->destroy_comp); |
ebb90986 | 168 | return 1; |
922a8e9f TT |
169 | } |
170 | ||
ebb90986 | 171 | return 0; |
922a8e9f TT |
172 | } |
173 | ||
174 | static void add_ref(struct iw_cm_id *cm_id) | |
175 | { | |
176 | struct iwcm_id_private *cm_id_priv; | |
177 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
178 | atomic_inc(&cm_id_priv->refcount); | |
179 | } | |
180 | ||
181 | static void rem_ref(struct iw_cm_id *cm_id) | |
182 | { | |
183 | struct iwcm_id_private *cm_id_priv; | |
184 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
ebb90986 SW |
185 | if (iwcm_deref_id(cm_id_priv) && |
186 | test_bit(IWCM_F_CALLBACK_DESTROY, &cm_id_priv->flags)) { | |
187 | BUG_ON(!list_empty(&cm_id_priv->work_list)); | |
188 | free_cm_id(cm_id_priv); | |
189 | } | |
922a8e9f TT |
190 | } |
191 | ||
192 | static int cm_event_handler(struct iw_cm_id *cm_id, struct iw_cm_event *event); | |
193 | ||
194 | struct iw_cm_id *iw_create_cm_id(struct ib_device *device, | |
195 | iw_cm_handler cm_handler, | |
196 | void *context) | |
197 | { | |
198 | struct iwcm_id_private *cm_id_priv; | |
199 | ||
200 | cm_id_priv = kzalloc(sizeof(*cm_id_priv), GFP_KERNEL); | |
201 | if (!cm_id_priv) | |
202 | return ERR_PTR(-ENOMEM); | |
203 | ||
204 | cm_id_priv->state = IW_CM_STATE_IDLE; | |
205 | cm_id_priv->id.device = device; | |
206 | cm_id_priv->id.cm_handler = cm_handler; | |
207 | cm_id_priv->id.context = context; | |
208 | cm_id_priv->id.event_handler = cm_event_handler; | |
209 | cm_id_priv->id.add_ref = add_ref; | |
210 | cm_id_priv->id.rem_ref = rem_ref; | |
211 | spin_lock_init(&cm_id_priv->lock); | |
212 | atomic_set(&cm_id_priv->refcount, 1); | |
213 | init_waitqueue_head(&cm_id_priv->connect_wait); | |
214 | init_completion(&cm_id_priv->destroy_comp); | |
215 | INIT_LIST_HEAD(&cm_id_priv->work_list); | |
216 | INIT_LIST_HEAD(&cm_id_priv->work_free_list); | |
217 | ||
218 | return &cm_id_priv->id; | |
219 | } | |
220 | EXPORT_SYMBOL(iw_create_cm_id); | |
221 | ||
222 | ||
223 | static int iwcm_modify_qp_err(struct ib_qp *qp) | |
224 | { | |
225 | struct ib_qp_attr qp_attr; | |
226 | ||
227 | if (!qp) | |
228 | return -EINVAL; | |
229 | ||
230 | qp_attr.qp_state = IB_QPS_ERR; | |
231 | return ib_modify_qp(qp, &qp_attr, IB_QP_STATE); | |
232 | } | |
233 | ||
234 | /* | |
235 | * This is really the RDMAC CLOSING state. It is most similar to the | |
236 | * IB SQD QP state. | |
237 | */ | |
238 | static int iwcm_modify_qp_sqd(struct ib_qp *qp) | |
239 | { | |
240 | struct ib_qp_attr qp_attr; | |
241 | ||
242 | BUG_ON(qp == NULL); | |
243 | qp_attr.qp_state = IB_QPS_SQD; | |
244 | return ib_modify_qp(qp, &qp_attr, IB_QP_STATE); | |
245 | } | |
246 | ||
247 | /* | |
248 | * CM_ID <-- CLOSING | |
249 | * | |
715a588f | 250 | * Block if a passive or active connection is currently being processed. Then |
922a8e9f TT |
251 | * process the event as follows: |
252 | * - If we are ESTABLISHED, move to CLOSING and modify the QP state | |
253 | * based on the abrupt flag | |
254 | * - If the connection is already in the CLOSING or IDLE state, the peer is | |
255 | * disconnecting concurrently with us and we've already seen the | |
256 | * DISCONNECT event -- ignore the request and return 0 | |
257 | * - Disconnect on a listening endpoint returns -EINVAL | |
258 | */ | |
259 | int iw_cm_disconnect(struct iw_cm_id *cm_id, int abrupt) | |
260 | { | |
261 | struct iwcm_id_private *cm_id_priv; | |
262 | unsigned long flags; | |
263 | int ret = 0; | |
264 | struct ib_qp *qp = NULL; | |
265 | ||
266 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
267 | /* Wait if we're currently in a connect or accept downcall */ | |
268 | wait_event(cm_id_priv->connect_wait, | |
269 | !test_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags)); | |
270 | ||
271 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
272 | switch (cm_id_priv->state) { | |
273 | case IW_CM_STATE_ESTABLISHED: | |
274 | cm_id_priv->state = IW_CM_STATE_CLOSING; | |
275 | ||
276 | /* QP could be <nul> for user-mode client */ | |
277 | if (cm_id_priv->qp) | |
278 | qp = cm_id_priv->qp; | |
279 | else | |
280 | ret = -EINVAL; | |
281 | break; | |
282 | case IW_CM_STATE_LISTEN: | |
283 | ret = -EINVAL; | |
284 | break; | |
285 | case IW_CM_STATE_CLOSING: | |
286 | /* remote peer closed first */ | |
287 | case IW_CM_STATE_IDLE: | |
288 | /* accept or connect returned !0 */ | |
289 | break; | |
290 | case IW_CM_STATE_CONN_RECV: | |
291 | /* | |
292 | * App called disconnect before/without calling accept after | |
293 | * connect_request event delivered. | |
294 | */ | |
295 | break; | |
296 | case IW_CM_STATE_CONN_SENT: | |
297 | /* Can only get here if wait above fails */ | |
298 | default: | |
299 | BUG(); | |
300 | } | |
301 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
302 | ||
303 | if (qp) { | |
304 | if (abrupt) | |
305 | ret = iwcm_modify_qp_err(qp); | |
306 | else | |
307 | ret = iwcm_modify_qp_sqd(qp); | |
308 | ||
309 | /* | |
310 | * If both sides are disconnecting the QP could | |
311 | * already be in ERR or SQD states | |
312 | */ | |
313 | ret = 0; | |
314 | } | |
315 | ||
316 | return ret; | |
317 | } | |
318 | EXPORT_SYMBOL(iw_cm_disconnect); | |
319 | ||
320 | /* | |
321 | * CM_ID <-- DESTROYING | |
322 | * | |
323 | * Clean up all resources associated with the connection and release | |
324 | * the initial reference taken by iw_create_cm_id. | |
325 | */ | |
326 | static void destroy_cm_id(struct iw_cm_id *cm_id) | |
327 | { | |
328 | struct iwcm_id_private *cm_id_priv; | |
329 | unsigned long flags; | |
330 | int ret; | |
331 | ||
332 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
333 | /* | |
334 | * Wait if we're currently in a connect or accept downcall. A | |
335 | * listening endpoint should never block here. | |
336 | */ | |
337 | wait_event(cm_id_priv->connect_wait, | |
338 | !test_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags)); | |
339 | ||
340 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
341 | switch (cm_id_priv->state) { | |
342 | case IW_CM_STATE_LISTEN: | |
343 | cm_id_priv->state = IW_CM_STATE_DESTROYING; | |
344 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
345 | /* destroy the listening endpoint */ | |
346 | ret = cm_id->device->iwcm->destroy_listen(cm_id); | |
347 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
348 | break; | |
349 | case IW_CM_STATE_ESTABLISHED: | |
350 | cm_id_priv->state = IW_CM_STATE_DESTROYING; | |
351 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
352 | /* Abrupt close of the connection */ | |
353 | (void)iwcm_modify_qp_err(cm_id_priv->qp); | |
354 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
355 | break; | |
356 | case IW_CM_STATE_IDLE: | |
357 | case IW_CM_STATE_CLOSING: | |
358 | cm_id_priv->state = IW_CM_STATE_DESTROYING; | |
359 | break; | |
360 | case IW_CM_STATE_CONN_RECV: | |
361 | /* | |
362 | * App called destroy before/without calling accept after | |
ebb90986 SW |
363 | * receiving connection request event notification or |
364 | * returned non zero from the event callback function. | |
365 | * In either case, must tell the provider to reject. | |
922a8e9f TT |
366 | */ |
367 | cm_id_priv->state = IW_CM_STATE_DESTROYING; | |
54e05f15 | 368 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); |
cb58160e | 369 | cm_id->device->iwcm->reject(cm_id, NULL, 0); |
54e05f15 | 370 | spin_lock_irqsave(&cm_id_priv->lock, flags); |
922a8e9f TT |
371 | break; |
372 | case IW_CM_STATE_CONN_SENT: | |
373 | case IW_CM_STATE_DESTROYING: | |
374 | default: | |
375 | BUG(); | |
376 | break; | |
377 | } | |
378 | if (cm_id_priv->qp) { | |
379 | cm_id_priv->id.device->iwcm->rem_ref(cm_id_priv->qp); | |
380 | cm_id_priv->qp = NULL; | |
381 | } | |
382 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
383 | ||
384 | (void)iwcm_deref_id(cm_id_priv); | |
385 | } | |
386 | ||
387 | /* | |
388 | * This function is only called by the application thread and cannot | |
389 | * be called by the event thread. The function will wait for all | |
390 | * references to be released on the cm_id and then kfree the cm_id | |
391 | * object. | |
392 | */ | |
393 | void iw_destroy_cm_id(struct iw_cm_id *cm_id) | |
394 | { | |
395 | struct iwcm_id_private *cm_id_priv; | |
396 | ||
397 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
398 | BUG_ON(test_bit(IWCM_F_CALLBACK_DESTROY, &cm_id_priv->flags)); | |
399 | ||
400 | destroy_cm_id(cm_id); | |
401 | ||
402 | wait_for_completion(&cm_id_priv->destroy_comp); | |
403 | ||
ebb90986 | 404 | free_cm_id(cm_id_priv); |
922a8e9f TT |
405 | } |
406 | EXPORT_SYMBOL(iw_destroy_cm_id); | |
407 | ||
408 | /* | |
409 | * CM_ID <-- LISTEN | |
410 | * | |
411 | * Start listening for connect requests. Generates one CONNECT_REQUEST | |
412 | * event for each inbound connect request. | |
413 | */ | |
414 | int iw_cm_listen(struct iw_cm_id *cm_id, int backlog) | |
415 | { | |
416 | struct iwcm_id_private *cm_id_priv; | |
417 | unsigned long flags; | |
13fccdb3 | 418 | int ret; |
922a8e9f TT |
419 | |
420 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
421 | ||
422 | ret = alloc_work_entries(cm_id_priv, backlog); | |
423 | if (ret) | |
424 | return ret; | |
425 | ||
426 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
427 | switch (cm_id_priv->state) { | |
428 | case IW_CM_STATE_IDLE: | |
429 | cm_id_priv->state = IW_CM_STATE_LISTEN; | |
430 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
431 | ret = cm_id->device->iwcm->create_listen(cm_id, backlog); | |
432 | if (ret) | |
433 | cm_id_priv->state = IW_CM_STATE_IDLE; | |
434 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
435 | break; | |
436 | default: | |
437 | ret = -EINVAL; | |
438 | } | |
439 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
440 | ||
441 | return ret; | |
442 | } | |
443 | EXPORT_SYMBOL(iw_cm_listen); | |
444 | ||
445 | /* | |
446 | * CM_ID <-- IDLE | |
447 | * | |
448 | * Rejects an inbound connection request. No events are generated. | |
449 | */ | |
450 | int iw_cm_reject(struct iw_cm_id *cm_id, | |
451 | const void *private_data, | |
452 | u8 private_data_len) | |
453 | { | |
454 | struct iwcm_id_private *cm_id_priv; | |
455 | unsigned long flags; | |
456 | int ret; | |
457 | ||
458 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
459 | set_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); | |
460 | ||
461 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
462 | if (cm_id_priv->state != IW_CM_STATE_CONN_RECV) { | |
463 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
464 | clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); | |
465 | wake_up_all(&cm_id_priv->connect_wait); | |
466 | return -EINVAL; | |
467 | } | |
468 | cm_id_priv->state = IW_CM_STATE_IDLE; | |
469 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
470 | ||
471 | ret = cm_id->device->iwcm->reject(cm_id, private_data, | |
472 | private_data_len); | |
473 | ||
474 | clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); | |
475 | wake_up_all(&cm_id_priv->connect_wait); | |
476 | ||
477 | return ret; | |
478 | } | |
479 | EXPORT_SYMBOL(iw_cm_reject); | |
480 | ||
481 | /* | |
482 | * CM_ID <-- ESTABLISHED | |
483 | * | |
484 | * Accepts an inbound connection request and generates an ESTABLISHED | |
485 | * event. Callers of iw_cm_disconnect and iw_destroy_cm_id will block | |
486 | * until the ESTABLISHED event is received from the provider. | |
487 | */ | |
488 | int iw_cm_accept(struct iw_cm_id *cm_id, | |
489 | struct iw_cm_conn_param *iw_param) | |
490 | { | |
491 | struct iwcm_id_private *cm_id_priv; | |
492 | struct ib_qp *qp; | |
493 | unsigned long flags; | |
494 | int ret; | |
495 | ||
496 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
497 | set_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); | |
498 | ||
499 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
500 | if (cm_id_priv->state != IW_CM_STATE_CONN_RECV) { | |
501 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
502 | clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); | |
503 | wake_up_all(&cm_id_priv->connect_wait); | |
504 | return -EINVAL; | |
505 | } | |
506 | /* Get the ib_qp given the QPN */ | |
507 | qp = cm_id->device->iwcm->get_qp(cm_id->device, iw_param->qpn); | |
508 | if (!qp) { | |
509 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
26012f07 AT |
510 | clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); |
511 | wake_up_all(&cm_id_priv->connect_wait); | |
922a8e9f TT |
512 | return -EINVAL; |
513 | } | |
514 | cm_id->device->iwcm->add_ref(qp); | |
515 | cm_id_priv->qp = qp; | |
516 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
517 | ||
518 | ret = cm_id->device->iwcm->accept(cm_id, iw_param); | |
519 | if (ret) { | |
520 | /* An error on accept precludes provider events */ | |
521 | BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_RECV); | |
522 | cm_id_priv->state = IW_CM_STATE_IDLE; | |
523 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
524 | if (cm_id_priv->qp) { | |
525 | cm_id->device->iwcm->rem_ref(qp); | |
526 | cm_id_priv->qp = NULL; | |
527 | } | |
528 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
529 | clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); | |
530 | wake_up_all(&cm_id_priv->connect_wait); | |
531 | } | |
532 | ||
533 | return ret; | |
534 | } | |
535 | EXPORT_SYMBOL(iw_cm_accept); | |
536 | ||
537 | /* | |
538 | * Active Side: CM_ID <-- CONN_SENT | |
539 | * | |
540 | * If successful, results in the generation of a CONNECT_REPLY | |
541 | * event. iw_cm_disconnect and iw_cm_destroy will block until the | |
542 | * CONNECT_REPLY event is received from the provider. | |
543 | */ | |
544 | int iw_cm_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *iw_param) | |
545 | { | |
546 | struct iwcm_id_private *cm_id_priv; | |
13fccdb3 | 547 | int ret; |
922a8e9f TT |
548 | unsigned long flags; |
549 | struct ib_qp *qp; | |
550 | ||
551 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
552 | ||
553 | ret = alloc_work_entries(cm_id_priv, 4); | |
554 | if (ret) | |
555 | return ret; | |
556 | ||
557 | set_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); | |
558 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
559 | ||
560 | if (cm_id_priv->state != IW_CM_STATE_IDLE) { | |
561 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
562 | clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); | |
563 | wake_up_all(&cm_id_priv->connect_wait); | |
564 | return -EINVAL; | |
565 | } | |
566 | ||
567 | /* Get the ib_qp given the QPN */ | |
568 | qp = cm_id->device->iwcm->get_qp(cm_id->device, iw_param->qpn); | |
569 | if (!qp) { | |
570 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
26012f07 AT |
571 | clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); |
572 | wake_up_all(&cm_id_priv->connect_wait); | |
922a8e9f TT |
573 | return -EINVAL; |
574 | } | |
575 | cm_id->device->iwcm->add_ref(qp); | |
576 | cm_id_priv->qp = qp; | |
577 | cm_id_priv->state = IW_CM_STATE_CONN_SENT; | |
578 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
579 | ||
580 | ret = cm_id->device->iwcm->connect(cm_id, iw_param); | |
581 | if (ret) { | |
582 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
583 | if (cm_id_priv->qp) { | |
584 | cm_id->device->iwcm->rem_ref(qp); | |
585 | cm_id_priv->qp = NULL; | |
586 | } | |
587 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
588 | BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_SENT); | |
589 | cm_id_priv->state = IW_CM_STATE_IDLE; | |
590 | clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); | |
591 | wake_up_all(&cm_id_priv->connect_wait); | |
592 | } | |
593 | ||
594 | return ret; | |
595 | } | |
596 | EXPORT_SYMBOL(iw_cm_connect); | |
597 | ||
598 | /* | |
599 | * Passive Side: new CM_ID <-- CONN_RECV | |
600 | * | |
601 | * Handles an inbound connect request. The function creates a new | |
602 | * iw_cm_id to represent the new connection and inherits the client | |
603 | * callback function and other attributes from the listening parent. | |
604 | * | |
605 | * The work item contains a pointer to the listen_cm_id and the event. The | |
606 | * listen_cm_id contains the client cm_handler, context and | |
607 | * device. These are copied when the device is cloned. The event | |
608 | * contains the new four tuple. | |
609 | * | |
610 | * An error on the child should not affect the parent, so this | |
611 | * function does not return a value. | |
612 | */ | |
613 | static void cm_conn_req_handler(struct iwcm_id_private *listen_id_priv, | |
614 | struct iw_cm_event *iw_event) | |
615 | { | |
616 | unsigned long flags; | |
617 | struct iw_cm_id *cm_id; | |
618 | struct iwcm_id_private *cm_id_priv; | |
619 | int ret; | |
620 | ||
621 | /* | |
622 | * The provider should never generate a connection request | |
623 | * event with a bad status. | |
624 | */ | |
625 | BUG_ON(iw_event->status); | |
626 | ||
922a8e9f TT |
627 | cm_id = iw_create_cm_id(listen_id_priv->id.device, |
628 | listen_id_priv->id.cm_handler, | |
629 | listen_id_priv->id.context); | |
630 | /* If the cm_id could not be created, ignore the request */ | |
631 | if (IS_ERR(cm_id)) | |
83b96586 | 632 | goto out; |
922a8e9f TT |
633 | |
634 | cm_id->provider_data = iw_event->provider_data; | |
635 | cm_id->local_addr = iw_event->local_addr; | |
636 | cm_id->remote_addr = iw_event->remote_addr; | |
637 | ||
638 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
639 | cm_id_priv->state = IW_CM_STATE_CONN_RECV; | |
640 | ||
3eae7c9f SW |
641 | /* |
642 | * We could be destroying the listening id. If so, ignore this | |
643 | * upcall. | |
644 | */ | |
645 | spin_lock_irqsave(&listen_id_priv->lock, flags); | |
646 | if (listen_id_priv->state != IW_CM_STATE_LISTEN) { | |
647 | spin_unlock_irqrestore(&listen_id_priv->lock, flags); | |
648 | iw_cm_reject(cm_id, NULL, 0); | |
649 | iw_destroy_cm_id(cm_id); | |
650 | goto out; | |
651 | } | |
652 | spin_unlock_irqrestore(&listen_id_priv->lock, flags); | |
653 | ||
922a8e9f TT |
654 | ret = alloc_work_entries(cm_id_priv, 3); |
655 | if (ret) { | |
656 | iw_cm_reject(cm_id, NULL, 0); | |
657 | iw_destroy_cm_id(cm_id); | |
83b96586 | 658 | goto out; |
922a8e9f TT |
659 | } |
660 | ||
661 | /* Call the client CM handler */ | |
662 | ret = cm_id->cm_handler(cm_id, iw_event); | |
663 | if (ret) { | |
ebb90986 | 664 | iw_cm_reject(cm_id, NULL, 0); |
922a8e9f TT |
665 | set_bit(IWCM_F_CALLBACK_DESTROY, &cm_id_priv->flags); |
666 | destroy_cm_id(cm_id); | |
667 | if (atomic_read(&cm_id_priv->refcount)==0) | |
ebb90986 | 668 | free_cm_id(cm_id_priv); |
922a8e9f TT |
669 | } |
670 | ||
83b96586 | 671 | out: |
922a8e9f TT |
672 | if (iw_event->private_data_len) |
673 | kfree(iw_event->private_data); | |
674 | } | |
675 | ||
676 | /* | |
677 | * Passive Side: CM_ID <-- ESTABLISHED | |
678 | * | |
679 | * The provider generated an ESTABLISHED event which means that | |
680 | * the MPA negotion has completed successfully and we are now in MPA | |
681 | * FPDU mode. | |
682 | * | |
683 | * This event can only be received in the CONN_RECV state. If the | |
684 | * remote peer closed, the ESTABLISHED event would be received followed | |
685 | * by the CLOSE event. If the app closes, it will block until we wake | |
686 | * it up after processing this event. | |
687 | */ | |
688 | static int cm_conn_est_handler(struct iwcm_id_private *cm_id_priv, | |
689 | struct iw_cm_event *iw_event) | |
690 | { | |
691 | unsigned long flags; | |
13fccdb3 | 692 | int ret; |
922a8e9f TT |
693 | |
694 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
695 | ||
696 | /* | |
697 | * We clear the CONNECT_WAIT bit here to allow the callback | |
698 | * function to call iw_cm_disconnect. Calling iw_destroy_cm_id | |
699 | * from a callback handler is not allowed. | |
700 | */ | |
701 | clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); | |
702 | BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_RECV); | |
703 | cm_id_priv->state = IW_CM_STATE_ESTABLISHED; | |
704 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
705 | ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event); | |
706 | wake_up_all(&cm_id_priv->connect_wait); | |
707 | ||
708 | return ret; | |
709 | } | |
710 | ||
711 | /* | |
712 | * Active Side: CM_ID <-- ESTABLISHED | |
713 | * | |
714 | * The app has called connect and is waiting for the established event to | |
715 | * post it's requests to the server. This event will wake up anyone | |
716 | * blocked in iw_cm_disconnect or iw_destroy_id. | |
717 | */ | |
718 | static int cm_conn_rep_handler(struct iwcm_id_private *cm_id_priv, | |
719 | struct iw_cm_event *iw_event) | |
720 | { | |
721 | unsigned long flags; | |
13fccdb3 | 722 | int ret; |
922a8e9f TT |
723 | |
724 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
725 | /* | |
726 | * Clear the connect wait bit so a callback function calling | |
727 | * iw_cm_disconnect will not wait and deadlock this thread | |
728 | */ | |
729 | clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); | |
730 | BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_SENT); | |
d0c49bf3 | 731 | if (iw_event->status == 0) { |
922a8e9f TT |
732 | cm_id_priv->id.local_addr = iw_event->local_addr; |
733 | cm_id_priv->id.remote_addr = iw_event->remote_addr; | |
734 | cm_id_priv->state = IW_CM_STATE_ESTABLISHED; | |
735 | } else { | |
736 | /* REJECTED or RESET */ | |
737 | cm_id_priv->id.device->iwcm->rem_ref(cm_id_priv->qp); | |
738 | cm_id_priv->qp = NULL; | |
739 | cm_id_priv->state = IW_CM_STATE_IDLE; | |
740 | } | |
741 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
742 | ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event); | |
743 | ||
744 | if (iw_event->private_data_len) | |
745 | kfree(iw_event->private_data); | |
746 | ||
747 | /* Wake up waiters on connect complete */ | |
748 | wake_up_all(&cm_id_priv->connect_wait); | |
749 | ||
750 | return ret; | |
751 | } | |
752 | ||
753 | /* | |
754 | * CM_ID <-- CLOSING | |
755 | * | |
756 | * If in the ESTABLISHED state, move to CLOSING. | |
757 | */ | |
758 | static void cm_disconnect_handler(struct iwcm_id_private *cm_id_priv, | |
759 | struct iw_cm_event *iw_event) | |
760 | { | |
761 | unsigned long flags; | |
762 | ||
763 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
764 | if (cm_id_priv->state == IW_CM_STATE_ESTABLISHED) | |
765 | cm_id_priv->state = IW_CM_STATE_CLOSING; | |
766 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
767 | } | |
768 | ||
769 | /* | |
770 | * CM_ID <-- IDLE | |
771 | * | |
772 | * If in the ESTBLISHED or CLOSING states, the QP will have have been | |
773 | * moved by the provider to the ERR state. Disassociate the CM_ID from | |
774 | * the QP, move to IDLE, and remove the 'connected' reference. | |
775 | * | |
776 | * If in some other state, the cm_id was destroyed asynchronously. | |
777 | * This is the last reference that will result in waking up | |
778 | * the app thread blocked in iw_destroy_cm_id. | |
779 | */ | |
780 | static int cm_close_handler(struct iwcm_id_private *cm_id_priv, | |
781 | struct iw_cm_event *iw_event) | |
782 | { | |
783 | unsigned long flags; | |
784 | int ret = 0; | |
785 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
786 | ||
787 | if (cm_id_priv->qp) { | |
788 | cm_id_priv->id.device->iwcm->rem_ref(cm_id_priv->qp); | |
789 | cm_id_priv->qp = NULL; | |
790 | } | |
791 | switch (cm_id_priv->state) { | |
792 | case IW_CM_STATE_ESTABLISHED: | |
793 | case IW_CM_STATE_CLOSING: | |
794 | cm_id_priv->state = IW_CM_STATE_IDLE; | |
795 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
796 | ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event); | |
797 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
798 | break; | |
799 | case IW_CM_STATE_DESTROYING: | |
800 | break; | |
801 | default: | |
802 | BUG(); | |
803 | } | |
804 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
805 | ||
806 | return ret; | |
807 | } | |
808 | ||
809 | static int process_event(struct iwcm_id_private *cm_id_priv, | |
810 | struct iw_cm_event *iw_event) | |
811 | { | |
812 | int ret = 0; | |
813 | ||
814 | switch (iw_event->event) { | |
815 | case IW_CM_EVENT_CONNECT_REQUEST: | |
816 | cm_conn_req_handler(cm_id_priv, iw_event); | |
817 | break; | |
818 | case IW_CM_EVENT_CONNECT_REPLY: | |
819 | ret = cm_conn_rep_handler(cm_id_priv, iw_event); | |
820 | break; | |
821 | case IW_CM_EVENT_ESTABLISHED: | |
822 | ret = cm_conn_est_handler(cm_id_priv, iw_event); | |
823 | break; | |
824 | case IW_CM_EVENT_DISCONNECT: | |
825 | cm_disconnect_handler(cm_id_priv, iw_event); | |
826 | break; | |
827 | case IW_CM_EVENT_CLOSE: | |
828 | ret = cm_close_handler(cm_id_priv, iw_event); | |
829 | break; | |
830 | default: | |
831 | BUG(); | |
832 | } | |
833 | ||
834 | return ret; | |
835 | } | |
836 | ||
837 | /* | |
838 | * Process events on the work_list for the cm_id. If the callback | |
839 | * function requests that the cm_id be deleted, a flag is set in the | |
840 | * cm_id flags to indicate that when the last reference is | |
841 | * removed, the cm_id is to be destroyed. This is necessary to | |
842 | * distinguish between an object that will be destroyed by the app | |
843 | * thread asleep on the destroy_comp list vs. an object destroyed | |
844 | * here synchronously when the last reference is removed. | |
845 | */ | |
c4028958 | 846 | static void cm_work_handler(struct work_struct *_work) |
922a8e9f | 847 | { |
4c1ac1b4 | 848 | struct iwcm_work *work = container_of(_work, struct iwcm_work, work); |
33ba0fa9 | 849 | struct iw_cm_event levent; |
922a8e9f TT |
850 | struct iwcm_id_private *cm_id_priv = work->cm_id; |
851 | unsigned long flags; | |
852 | int empty; | |
853 | int ret = 0; | |
d7c1fbd6 | 854 | int destroy_id; |
922a8e9f TT |
855 | |
856 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
857 | empty = list_empty(&cm_id_priv->work_list); | |
858 | while (!empty) { | |
859 | work = list_entry(cm_id_priv->work_list.next, | |
860 | struct iwcm_work, list); | |
861 | list_del_init(&work->list); | |
862 | empty = list_empty(&cm_id_priv->work_list); | |
33ba0fa9 | 863 | levent = work->event; |
922a8e9f TT |
864 | put_work(work); |
865 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
866 | ||
33ba0fa9 | 867 | ret = process_event(cm_id_priv, &levent); |
922a8e9f TT |
868 | if (ret) { |
869 | set_bit(IWCM_F_CALLBACK_DESTROY, &cm_id_priv->flags); | |
870 | destroy_cm_id(&cm_id_priv->id); | |
871 | } | |
872 | BUG_ON(atomic_read(&cm_id_priv->refcount)==0); | |
d7c1fbd6 | 873 | destroy_id = test_bit(IWCM_F_CALLBACK_DESTROY, &cm_id_priv->flags); |
ebb90986 | 874 | if (iwcm_deref_id(cm_id_priv)) { |
d7c1fbd6 | 875 | if (destroy_id) { |
ebb90986 SW |
876 | BUG_ON(!list_empty(&cm_id_priv->work_list)); |
877 | free_cm_id(cm_id_priv); | |
878 | } | |
922a8e9f TT |
879 | return; |
880 | } | |
e413a823 SW |
881 | if (empty) |
882 | return; | |
922a8e9f TT |
883 | spin_lock_irqsave(&cm_id_priv->lock, flags); |
884 | } | |
885 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
886 | } | |
887 | ||
888 | /* | |
889 | * This function is called on interrupt context. Schedule events on | |
890 | * the iwcm_wq thread to allow callback functions to downcall into | |
891 | * the CM and/or block. Events are queued to a per-CM_ID | |
892 | * work_list. If this is the first event on the work_list, the work | |
893 | * element is also queued on the iwcm_wq thread. | |
894 | * | |
895 | * Each event holds a reference on the cm_id. Until the last posted | |
896 | * event has been delivered and processed, the cm_id cannot be | |
897 | * deleted. | |
898 | * | |
899 | * Returns: | |
900 | * 0 - the event was handled. | |
901 | * -ENOMEM - the event was not handled due to lack of resources. | |
902 | */ | |
903 | static int cm_event_handler(struct iw_cm_id *cm_id, | |
904 | struct iw_cm_event *iw_event) | |
905 | { | |
906 | struct iwcm_work *work; | |
907 | struct iwcm_id_private *cm_id_priv; | |
908 | unsigned long flags; | |
909 | int ret = 0; | |
910 | ||
911 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
912 | ||
913 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
914 | work = get_work(cm_id_priv); | |
915 | if (!work) { | |
916 | ret = -ENOMEM; | |
917 | goto out; | |
918 | } | |
919 | ||
c4028958 | 920 | INIT_WORK(&work->work, cm_work_handler); |
922a8e9f TT |
921 | work->cm_id = cm_id_priv; |
922 | work->event = *iw_event; | |
923 | ||
924 | if ((work->event.event == IW_CM_EVENT_CONNECT_REQUEST || | |
925 | work->event.event == IW_CM_EVENT_CONNECT_REPLY) && | |
926 | work->event.private_data_len) { | |
715a588f | 927 | ret = copy_private_data(&work->event); |
922a8e9f TT |
928 | if (ret) { |
929 | put_work(work); | |
930 | goto out; | |
931 | } | |
932 | } | |
933 | ||
934 | atomic_inc(&cm_id_priv->refcount); | |
935 | if (list_empty(&cm_id_priv->work_list)) { | |
936 | list_add_tail(&work->list, &cm_id_priv->work_list); | |
937 | queue_work(iwcm_wq, &work->work); | |
938 | } else | |
939 | list_add_tail(&work->list, &cm_id_priv->work_list); | |
940 | out: | |
941 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
942 | return ret; | |
943 | } | |
944 | ||
945 | static int iwcm_init_qp_init_attr(struct iwcm_id_private *cm_id_priv, | |
946 | struct ib_qp_attr *qp_attr, | |
947 | int *qp_attr_mask) | |
948 | { | |
949 | unsigned long flags; | |
950 | int ret; | |
951 | ||
952 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
953 | switch (cm_id_priv->state) { | |
954 | case IW_CM_STATE_IDLE: | |
955 | case IW_CM_STATE_CONN_SENT: | |
956 | case IW_CM_STATE_CONN_RECV: | |
957 | case IW_CM_STATE_ESTABLISHED: | |
958 | *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS; | |
1ca8d156 | 959 | qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE| |
922a8e9f TT |
960 | IB_ACCESS_REMOTE_READ; |
961 | ret = 0; | |
962 | break; | |
963 | default: | |
964 | ret = -EINVAL; | |
965 | break; | |
966 | } | |
967 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
968 | return ret; | |
969 | } | |
970 | ||
971 | static int iwcm_init_qp_rts_attr(struct iwcm_id_private *cm_id_priv, | |
972 | struct ib_qp_attr *qp_attr, | |
973 | int *qp_attr_mask) | |
974 | { | |
975 | unsigned long flags; | |
976 | int ret; | |
977 | ||
978 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
979 | switch (cm_id_priv->state) { | |
980 | case IW_CM_STATE_IDLE: | |
981 | case IW_CM_STATE_CONN_SENT: | |
982 | case IW_CM_STATE_CONN_RECV: | |
983 | case IW_CM_STATE_ESTABLISHED: | |
984 | *qp_attr_mask = 0; | |
985 | ret = 0; | |
986 | break; | |
987 | default: | |
988 | ret = -EINVAL; | |
989 | break; | |
990 | } | |
991 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
992 | return ret; | |
993 | } | |
994 | ||
995 | int iw_cm_init_qp_attr(struct iw_cm_id *cm_id, | |
996 | struct ib_qp_attr *qp_attr, | |
997 | int *qp_attr_mask) | |
998 | { | |
999 | struct iwcm_id_private *cm_id_priv; | |
1000 | int ret; | |
1001 | ||
1002 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
1003 | switch (qp_attr->qp_state) { | |
1004 | case IB_QPS_INIT: | |
1005 | case IB_QPS_RTR: | |
1006 | ret = iwcm_init_qp_init_attr(cm_id_priv, | |
1007 | qp_attr, qp_attr_mask); | |
1008 | break; | |
1009 | case IB_QPS_RTS: | |
1010 | ret = iwcm_init_qp_rts_attr(cm_id_priv, | |
1011 | qp_attr, qp_attr_mask); | |
1012 | break; | |
1013 | default: | |
1014 | ret = -EINVAL; | |
1015 | break; | |
1016 | } | |
1017 | return ret; | |
1018 | } | |
1019 | EXPORT_SYMBOL(iw_cm_init_qp_attr); | |
1020 | ||
1021 | static int __init iw_cm_init(void) | |
1022 | { | |
1023 | iwcm_wq = create_singlethread_workqueue("iw_cm_wq"); | |
1024 | if (!iwcm_wq) | |
1025 | return -ENOMEM; | |
1026 | ||
1027 | return 0; | |
1028 | } | |
1029 | ||
1030 | static void __exit iw_cm_cleanup(void) | |
1031 | { | |
1032 | destroy_workqueue(iwcm_wq); | |
1033 | } | |
1034 | ||
1035 | module_init(iw_cm_init); | |
1036 | module_exit(iw_cm_cleanup); |