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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> |
2f0304d2 | 49 | #include <linux/sysctl.h> |
922a8e9f TT |
50 | |
51 | #include <rdma/iw_cm.h> | |
52 | #include <rdma/ib_addr.h> | |
53 | ||
54 | #include "iwcm.h" | |
55 | ||
56 | MODULE_AUTHOR("Tom Tucker"); | |
57 | MODULE_DESCRIPTION("iWARP CM"); | |
58 | MODULE_LICENSE("Dual BSD/GPL"); | |
59 | ||
60 | static struct workqueue_struct *iwcm_wq; | |
61 | struct iwcm_work { | |
62 | struct work_struct work; | |
63 | struct iwcm_id_private *cm_id; | |
64 | struct list_head list; | |
65 | struct iw_cm_event event; | |
66 | struct list_head free_list; | |
67 | }; | |
68 | ||
2f0304d2 SW |
69 | static unsigned int default_backlog = 256; |
70 | ||
71 | static struct ctl_table_header *iwcm_ctl_table_hdr; | |
72 | static struct ctl_table iwcm_ctl_table[] = { | |
73 | { | |
74 | .procname = "default_backlog", | |
75 | .data = &default_backlog, | |
76 | .maxlen = sizeof(default_backlog), | |
77 | .mode = 0644, | |
78 | .proc_handler = proc_dointvec, | |
79 | }, | |
80 | { } | |
81 | }; | |
82 | ||
922a8e9f TT |
83 | /* |
84 | * The following services provide a mechanism for pre-allocating iwcm_work | |
85 | * elements. The design pre-allocates them based on the cm_id type: | |
86 | * LISTENING IDS: Get enough elements preallocated to handle the | |
87 | * listen backlog. | |
88 | * ACTIVE IDS: 4: CONNECT_REPLY, ESTABLISHED, DISCONNECT, CLOSE | |
89 | * PASSIVE IDS: 3: ESTABLISHED, DISCONNECT, CLOSE | |
90 | * | |
91 | * Allocating them in connect and listen avoids having to deal | |
92 | * with allocation failures on the event upcall from the provider (which | |
93 | * is called in the interrupt context). | |
94 | * | |
95 | * One exception is when creating the cm_id for incoming connection requests. | |
96 | * There are two cases: | |
97 | * 1) in the event upcall, cm_event_handler(), for a listening cm_id. If | |
98 | * the backlog is exceeded, then no more connection request events will | |
99 | * be processed. cm_event_handler() returns -ENOMEM in this case. Its up | |
715a588f | 100 | * to the provider to reject the connection request. |
922a8e9f TT |
101 | * 2) in the connection request workqueue handler, cm_conn_req_handler(). |
102 | * If work elements cannot be allocated for the new connect request cm_id, | |
103 | * then IWCM will call the provider reject method. This is ok since | |
104 | * cm_conn_req_handler() runs in the workqueue thread context. | |
105 | */ | |
106 | ||
107 | static struct iwcm_work *get_work(struct iwcm_id_private *cm_id_priv) | |
108 | { | |
109 | struct iwcm_work *work; | |
110 | ||
111 | if (list_empty(&cm_id_priv->work_free_list)) | |
112 | return NULL; | |
113 | work = list_entry(cm_id_priv->work_free_list.next, struct iwcm_work, | |
114 | free_list); | |
115 | list_del_init(&work->free_list); | |
116 | return work; | |
117 | } | |
118 | ||
119 | static void put_work(struct iwcm_work *work) | |
120 | { | |
121 | list_add(&work->free_list, &work->cm_id->work_free_list); | |
122 | } | |
123 | ||
124 | static void dealloc_work_entries(struct iwcm_id_private *cm_id_priv) | |
125 | { | |
126 | struct list_head *e, *tmp; | |
127 | ||
128 | list_for_each_safe(e, tmp, &cm_id_priv->work_free_list) | |
129 | kfree(list_entry(e, struct iwcm_work, free_list)); | |
130 | } | |
131 | ||
132 | static int alloc_work_entries(struct iwcm_id_private *cm_id_priv, int count) | |
133 | { | |
134 | struct iwcm_work *work; | |
135 | ||
136 | BUG_ON(!list_empty(&cm_id_priv->work_free_list)); | |
137 | while (count--) { | |
138 | work = kmalloc(sizeof(struct iwcm_work), GFP_KERNEL); | |
139 | if (!work) { | |
140 | dealloc_work_entries(cm_id_priv); | |
141 | return -ENOMEM; | |
142 | } | |
143 | work->cm_id = cm_id_priv; | |
144 | INIT_LIST_HEAD(&work->list); | |
145 | put_work(work); | |
146 | } | |
147 | return 0; | |
148 | } | |
149 | ||
150 | /* | |
715a588f KK |
151 | * Save private data from incoming connection requests to |
152 | * iw_cm_event, so the low level driver doesn't have to. Adjust | |
922a8e9f TT |
153 | * the event ptr to point to the local copy. |
154 | */ | |
715a588f | 155 | static int copy_private_data(struct iw_cm_event *event) |
922a8e9f TT |
156 | { |
157 | void *p; | |
158 | ||
bed8bdfd | 159 | p = kmemdup(event->private_data, event->private_data_len, GFP_ATOMIC); |
922a8e9f TT |
160 | if (!p) |
161 | return -ENOMEM; | |
922a8e9f TT |
162 | event->private_data = p; |
163 | return 0; | |
164 | } | |
165 | ||
ebb90986 SW |
166 | static void free_cm_id(struct iwcm_id_private *cm_id_priv) |
167 | { | |
168 | dealloc_work_entries(cm_id_priv); | |
169 | kfree(cm_id_priv); | |
170 | } | |
171 | ||
922a8e9f | 172 | /* |
9ab1ffa8 KK |
173 | * Release a reference on cm_id. If the last reference is being |
174 | * released, enable the waiting thread (in iw_destroy_cm_id) to | |
175 | * get woken up, and return 1 if a thread is already waiting. | |
922a8e9f TT |
176 | */ |
177 | static int iwcm_deref_id(struct iwcm_id_private *cm_id_priv) | |
178 | { | |
922a8e9f TT |
179 | BUG_ON(atomic_read(&cm_id_priv->refcount)==0); |
180 | if (atomic_dec_and_test(&cm_id_priv->refcount)) { | |
181 | BUG_ON(!list_empty(&cm_id_priv->work_list)); | |
922a8e9f | 182 | complete(&cm_id_priv->destroy_comp); |
ebb90986 | 183 | return 1; |
922a8e9f TT |
184 | } |
185 | ||
ebb90986 | 186 | return 0; |
922a8e9f TT |
187 | } |
188 | ||
189 | static void add_ref(struct iw_cm_id *cm_id) | |
190 | { | |
191 | struct iwcm_id_private *cm_id_priv; | |
192 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
193 | atomic_inc(&cm_id_priv->refcount); | |
194 | } | |
195 | ||
196 | static void rem_ref(struct iw_cm_id *cm_id) | |
197 | { | |
198 | struct iwcm_id_private *cm_id_priv; | |
6b59ba60 SW |
199 | int cb_destroy; |
200 | ||
922a8e9f | 201 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); |
6b59ba60 SW |
202 | |
203 | /* | |
204 | * Test bit before deref in case the cm_id gets freed on another | |
205 | * thread. | |
206 | */ | |
207 | cb_destroy = test_bit(IWCM_F_CALLBACK_DESTROY, &cm_id_priv->flags); | |
208 | if (iwcm_deref_id(cm_id_priv) && cb_destroy) { | |
ebb90986 SW |
209 | BUG_ON(!list_empty(&cm_id_priv->work_list)); |
210 | free_cm_id(cm_id_priv); | |
211 | } | |
922a8e9f TT |
212 | } |
213 | ||
214 | static int cm_event_handler(struct iw_cm_id *cm_id, struct iw_cm_event *event); | |
215 | ||
216 | struct iw_cm_id *iw_create_cm_id(struct ib_device *device, | |
217 | iw_cm_handler cm_handler, | |
218 | void *context) | |
219 | { | |
220 | struct iwcm_id_private *cm_id_priv; | |
221 | ||
222 | cm_id_priv = kzalloc(sizeof(*cm_id_priv), GFP_KERNEL); | |
223 | if (!cm_id_priv) | |
224 | return ERR_PTR(-ENOMEM); | |
225 | ||
226 | cm_id_priv->state = IW_CM_STATE_IDLE; | |
227 | cm_id_priv->id.device = device; | |
228 | cm_id_priv->id.cm_handler = cm_handler; | |
229 | cm_id_priv->id.context = context; | |
230 | cm_id_priv->id.event_handler = cm_event_handler; | |
231 | cm_id_priv->id.add_ref = add_ref; | |
232 | cm_id_priv->id.rem_ref = rem_ref; | |
233 | spin_lock_init(&cm_id_priv->lock); | |
234 | atomic_set(&cm_id_priv->refcount, 1); | |
235 | init_waitqueue_head(&cm_id_priv->connect_wait); | |
236 | init_completion(&cm_id_priv->destroy_comp); | |
237 | INIT_LIST_HEAD(&cm_id_priv->work_list); | |
238 | INIT_LIST_HEAD(&cm_id_priv->work_free_list); | |
239 | ||
240 | return &cm_id_priv->id; | |
241 | } | |
242 | EXPORT_SYMBOL(iw_create_cm_id); | |
243 | ||
244 | ||
245 | static int iwcm_modify_qp_err(struct ib_qp *qp) | |
246 | { | |
247 | struct ib_qp_attr qp_attr; | |
248 | ||
249 | if (!qp) | |
250 | return -EINVAL; | |
251 | ||
252 | qp_attr.qp_state = IB_QPS_ERR; | |
253 | return ib_modify_qp(qp, &qp_attr, IB_QP_STATE); | |
254 | } | |
255 | ||
256 | /* | |
257 | * This is really the RDMAC CLOSING state. It is most similar to the | |
258 | * IB SQD QP state. | |
259 | */ | |
260 | static int iwcm_modify_qp_sqd(struct ib_qp *qp) | |
261 | { | |
262 | struct ib_qp_attr qp_attr; | |
263 | ||
264 | BUG_ON(qp == NULL); | |
265 | qp_attr.qp_state = IB_QPS_SQD; | |
266 | return ib_modify_qp(qp, &qp_attr, IB_QP_STATE); | |
267 | } | |
268 | ||
269 | /* | |
270 | * CM_ID <-- CLOSING | |
271 | * | |
715a588f | 272 | * Block if a passive or active connection is currently being processed. Then |
922a8e9f TT |
273 | * process the event as follows: |
274 | * - If we are ESTABLISHED, move to CLOSING and modify the QP state | |
275 | * based on the abrupt flag | |
276 | * - If the connection is already in the CLOSING or IDLE state, the peer is | |
277 | * disconnecting concurrently with us and we've already seen the | |
278 | * DISCONNECT event -- ignore the request and return 0 | |
279 | * - Disconnect on a listening endpoint returns -EINVAL | |
280 | */ | |
281 | int iw_cm_disconnect(struct iw_cm_id *cm_id, int abrupt) | |
282 | { | |
283 | struct iwcm_id_private *cm_id_priv; | |
284 | unsigned long flags; | |
285 | int ret = 0; | |
286 | struct ib_qp *qp = NULL; | |
287 | ||
288 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
289 | /* Wait if we're currently in a connect or accept downcall */ | |
290 | wait_event(cm_id_priv->connect_wait, | |
291 | !test_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags)); | |
292 | ||
293 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
294 | switch (cm_id_priv->state) { | |
295 | case IW_CM_STATE_ESTABLISHED: | |
296 | cm_id_priv->state = IW_CM_STATE_CLOSING; | |
297 | ||
298 | /* QP could be <nul> for user-mode client */ | |
299 | if (cm_id_priv->qp) | |
300 | qp = cm_id_priv->qp; | |
301 | else | |
302 | ret = -EINVAL; | |
303 | break; | |
304 | case IW_CM_STATE_LISTEN: | |
305 | ret = -EINVAL; | |
306 | break; | |
307 | case IW_CM_STATE_CLOSING: | |
308 | /* remote peer closed first */ | |
309 | case IW_CM_STATE_IDLE: | |
310 | /* accept or connect returned !0 */ | |
311 | break; | |
312 | case IW_CM_STATE_CONN_RECV: | |
313 | /* | |
314 | * App called disconnect before/without calling accept after | |
315 | * connect_request event delivered. | |
316 | */ | |
317 | break; | |
318 | case IW_CM_STATE_CONN_SENT: | |
319 | /* Can only get here if wait above fails */ | |
320 | default: | |
321 | BUG(); | |
322 | } | |
323 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
324 | ||
325 | if (qp) { | |
326 | if (abrupt) | |
327 | ret = iwcm_modify_qp_err(qp); | |
328 | else | |
329 | ret = iwcm_modify_qp_sqd(qp); | |
330 | ||
331 | /* | |
332 | * If both sides are disconnecting the QP could | |
333 | * already be in ERR or SQD states | |
334 | */ | |
335 | ret = 0; | |
336 | } | |
337 | ||
338 | return ret; | |
339 | } | |
340 | EXPORT_SYMBOL(iw_cm_disconnect); | |
341 | ||
342 | /* | |
343 | * CM_ID <-- DESTROYING | |
344 | * | |
345 | * Clean up all resources associated with the connection and release | |
346 | * the initial reference taken by iw_create_cm_id. | |
347 | */ | |
348 | static void destroy_cm_id(struct iw_cm_id *cm_id) | |
349 | { | |
350 | struct iwcm_id_private *cm_id_priv; | |
351 | unsigned long flags; | |
922a8e9f TT |
352 | |
353 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
354 | /* | |
355 | * Wait if we're currently in a connect or accept downcall. A | |
356 | * listening endpoint should never block here. | |
357 | */ | |
358 | wait_event(cm_id_priv->connect_wait, | |
359 | !test_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags)); | |
360 | ||
361 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
362 | switch (cm_id_priv->state) { | |
363 | case IW_CM_STATE_LISTEN: | |
364 | cm_id_priv->state = IW_CM_STATE_DESTROYING; | |
365 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
366 | /* destroy the listening endpoint */ | |
05633102 | 367 | cm_id->device->iwcm->destroy_listen(cm_id); |
922a8e9f TT |
368 | spin_lock_irqsave(&cm_id_priv->lock, flags); |
369 | break; | |
370 | case IW_CM_STATE_ESTABLISHED: | |
371 | cm_id_priv->state = IW_CM_STATE_DESTROYING; | |
372 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
373 | /* Abrupt close of the connection */ | |
374 | (void)iwcm_modify_qp_err(cm_id_priv->qp); | |
375 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
376 | break; | |
377 | case IW_CM_STATE_IDLE: | |
378 | case IW_CM_STATE_CLOSING: | |
379 | cm_id_priv->state = IW_CM_STATE_DESTROYING; | |
380 | break; | |
381 | case IW_CM_STATE_CONN_RECV: | |
382 | /* | |
383 | * App called destroy before/without calling accept after | |
ebb90986 SW |
384 | * receiving connection request event notification or |
385 | * returned non zero from the event callback function. | |
386 | * In either case, must tell the provider to reject. | |
922a8e9f TT |
387 | */ |
388 | cm_id_priv->state = IW_CM_STATE_DESTROYING; | |
54e05f15 | 389 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); |
cb58160e | 390 | cm_id->device->iwcm->reject(cm_id, NULL, 0); |
54e05f15 | 391 | spin_lock_irqsave(&cm_id_priv->lock, flags); |
922a8e9f TT |
392 | break; |
393 | case IW_CM_STATE_CONN_SENT: | |
394 | case IW_CM_STATE_DESTROYING: | |
395 | default: | |
396 | BUG(); | |
397 | break; | |
398 | } | |
399 | if (cm_id_priv->qp) { | |
400 | cm_id_priv->id.device->iwcm->rem_ref(cm_id_priv->qp); | |
401 | cm_id_priv->qp = NULL; | |
402 | } | |
403 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
404 | ||
405 | (void)iwcm_deref_id(cm_id_priv); | |
406 | } | |
407 | ||
408 | /* | |
409 | * This function is only called by the application thread and cannot | |
410 | * be called by the event thread. The function will wait for all | |
411 | * references to be released on the cm_id and then kfree the cm_id | |
412 | * object. | |
413 | */ | |
414 | void iw_destroy_cm_id(struct iw_cm_id *cm_id) | |
415 | { | |
416 | struct iwcm_id_private *cm_id_priv; | |
417 | ||
418 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
419 | BUG_ON(test_bit(IWCM_F_CALLBACK_DESTROY, &cm_id_priv->flags)); | |
420 | ||
421 | destroy_cm_id(cm_id); | |
422 | ||
423 | wait_for_completion(&cm_id_priv->destroy_comp); | |
424 | ||
ebb90986 | 425 | free_cm_id(cm_id_priv); |
922a8e9f TT |
426 | } |
427 | EXPORT_SYMBOL(iw_destroy_cm_id); | |
428 | ||
429 | /* | |
430 | * CM_ID <-- LISTEN | |
431 | * | |
432 | * Start listening for connect requests. Generates one CONNECT_REQUEST | |
433 | * event for each inbound connect request. | |
434 | */ | |
435 | int iw_cm_listen(struct iw_cm_id *cm_id, int backlog) | |
436 | { | |
437 | struct iwcm_id_private *cm_id_priv; | |
438 | unsigned long flags; | |
13fccdb3 | 439 | int ret; |
922a8e9f TT |
440 | |
441 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
442 | ||
2f0304d2 SW |
443 | if (!backlog) |
444 | backlog = default_backlog; | |
445 | ||
922a8e9f TT |
446 | ret = alloc_work_entries(cm_id_priv, backlog); |
447 | if (ret) | |
448 | return ret; | |
449 | ||
450 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
451 | switch (cm_id_priv->state) { | |
452 | case IW_CM_STATE_IDLE: | |
453 | cm_id_priv->state = IW_CM_STATE_LISTEN; | |
454 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
455 | ret = cm_id->device->iwcm->create_listen(cm_id, backlog); | |
456 | if (ret) | |
457 | cm_id_priv->state = IW_CM_STATE_IDLE; | |
458 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
459 | break; | |
460 | default: | |
461 | ret = -EINVAL; | |
462 | } | |
463 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
464 | ||
465 | return ret; | |
466 | } | |
467 | EXPORT_SYMBOL(iw_cm_listen); | |
468 | ||
469 | /* | |
470 | * CM_ID <-- IDLE | |
471 | * | |
472 | * Rejects an inbound connection request. No events are generated. | |
473 | */ | |
474 | int iw_cm_reject(struct iw_cm_id *cm_id, | |
475 | const void *private_data, | |
476 | u8 private_data_len) | |
477 | { | |
478 | struct iwcm_id_private *cm_id_priv; | |
479 | unsigned long flags; | |
480 | int ret; | |
481 | ||
482 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
483 | set_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); | |
484 | ||
485 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
486 | if (cm_id_priv->state != IW_CM_STATE_CONN_RECV) { | |
487 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
488 | clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); | |
489 | wake_up_all(&cm_id_priv->connect_wait); | |
490 | return -EINVAL; | |
491 | } | |
492 | cm_id_priv->state = IW_CM_STATE_IDLE; | |
493 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
494 | ||
495 | ret = cm_id->device->iwcm->reject(cm_id, private_data, | |
496 | private_data_len); | |
497 | ||
498 | clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); | |
499 | wake_up_all(&cm_id_priv->connect_wait); | |
500 | ||
501 | return ret; | |
502 | } | |
503 | EXPORT_SYMBOL(iw_cm_reject); | |
504 | ||
505 | /* | |
506 | * CM_ID <-- ESTABLISHED | |
507 | * | |
508 | * Accepts an inbound connection request and generates an ESTABLISHED | |
509 | * event. Callers of iw_cm_disconnect and iw_destroy_cm_id will block | |
510 | * until the ESTABLISHED event is received from the provider. | |
511 | */ | |
512 | int iw_cm_accept(struct iw_cm_id *cm_id, | |
513 | struct iw_cm_conn_param *iw_param) | |
514 | { | |
515 | struct iwcm_id_private *cm_id_priv; | |
516 | struct ib_qp *qp; | |
517 | unsigned long flags; | |
518 | int ret; | |
519 | ||
520 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
521 | set_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); | |
522 | ||
523 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
524 | if (cm_id_priv->state != IW_CM_STATE_CONN_RECV) { | |
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 | return -EINVAL; | |
529 | } | |
530 | /* Get the ib_qp given the QPN */ | |
531 | qp = cm_id->device->iwcm->get_qp(cm_id->device, iw_param->qpn); | |
532 | if (!qp) { | |
533 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
26012f07 AT |
534 | clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); |
535 | wake_up_all(&cm_id_priv->connect_wait); | |
922a8e9f TT |
536 | return -EINVAL; |
537 | } | |
538 | cm_id->device->iwcm->add_ref(qp); | |
539 | cm_id_priv->qp = qp; | |
540 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
541 | ||
542 | ret = cm_id->device->iwcm->accept(cm_id, iw_param); | |
543 | if (ret) { | |
544 | /* An error on accept precludes provider events */ | |
545 | BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_RECV); | |
546 | cm_id_priv->state = IW_CM_STATE_IDLE; | |
547 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
548 | if (cm_id_priv->qp) { | |
549 | cm_id->device->iwcm->rem_ref(qp); | |
550 | cm_id_priv->qp = NULL; | |
551 | } | |
552 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
553 | clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); | |
554 | wake_up_all(&cm_id_priv->connect_wait); | |
555 | } | |
556 | ||
557 | return ret; | |
558 | } | |
559 | EXPORT_SYMBOL(iw_cm_accept); | |
560 | ||
561 | /* | |
562 | * Active Side: CM_ID <-- CONN_SENT | |
563 | * | |
564 | * If successful, results in the generation of a CONNECT_REPLY | |
565 | * event. iw_cm_disconnect and iw_cm_destroy will block until the | |
566 | * CONNECT_REPLY event is received from the provider. | |
567 | */ | |
568 | int iw_cm_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *iw_param) | |
569 | { | |
570 | struct iwcm_id_private *cm_id_priv; | |
13fccdb3 | 571 | int ret; |
922a8e9f TT |
572 | unsigned long flags; |
573 | struct ib_qp *qp; | |
574 | ||
575 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
576 | ||
577 | ret = alloc_work_entries(cm_id_priv, 4); | |
578 | if (ret) | |
579 | return ret; | |
580 | ||
581 | set_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); | |
582 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
583 | ||
584 | if (cm_id_priv->state != IW_CM_STATE_IDLE) { | |
585 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
586 | clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); | |
587 | wake_up_all(&cm_id_priv->connect_wait); | |
588 | return -EINVAL; | |
589 | } | |
590 | ||
591 | /* Get the ib_qp given the QPN */ | |
592 | qp = cm_id->device->iwcm->get_qp(cm_id->device, iw_param->qpn); | |
593 | if (!qp) { | |
594 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
26012f07 AT |
595 | clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); |
596 | wake_up_all(&cm_id_priv->connect_wait); | |
922a8e9f TT |
597 | return -EINVAL; |
598 | } | |
599 | cm_id->device->iwcm->add_ref(qp); | |
600 | cm_id_priv->qp = qp; | |
601 | cm_id_priv->state = IW_CM_STATE_CONN_SENT; | |
602 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
603 | ||
604 | ret = cm_id->device->iwcm->connect(cm_id, iw_param); | |
605 | if (ret) { | |
606 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
607 | if (cm_id_priv->qp) { | |
608 | cm_id->device->iwcm->rem_ref(qp); | |
609 | cm_id_priv->qp = NULL; | |
610 | } | |
611 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
612 | BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_SENT); | |
613 | cm_id_priv->state = IW_CM_STATE_IDLE; | |
614 | clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); | |
615 | wake_up_all(&cm_id_priv->connect_wait); | |
616 | } | |
617 | ||
618 | return ret; | |
619 | } | |
620 | EXPORT_SYMBOL(iw_cm_connect); | |
621 | ||
622 | /* | |
623 | * Passive Side: new CM_ID <-- CONN_RECV | |
624 | * | |
625 | * Handles an inbound connect request. The function creates a new | |
626 | * iw_cm_id to represent the new connection and inherits the client | |
627 | * callback function and other attributes from the listening parent. | |
628 | * | |
629 | * The work item contains a pointer to the listen_cm_id and the event. The | |
630 | * listen_cm_id contains the client cm_handler, context and | |
631 | * device. These are copied when the device is cloned. The event | |
632 | * contains the new four tuple. | |
633 | * | |
634 | * An error on the child should not affect the parent, so this | |
635 | * function does not return a value. | |
636 | */ | |
637 | static void cm_conn_req_handler(struct iwcm_id_private *listen_id_priv, | |
638 | struct iw_cm_event *iw_event) | |
639 | { | |
640 | unsigned long flags; | |
641 | struct iw_cm_id *cm_id; | |
642 | struct iwcm_id_private *cm_id_priv; | |
643 | int ret; | |
644 | ||
645 | /* | |
646 | * The provider should never generate a connection request | |
647 | * event with a bad status. | |
648 | */ | |
649 | BUG_ON(iw_event->status); | |
650 | ||
922a8e9f TT |
651 | cm_id = iw_create_cm_id(listen_id_priv->id.device, |
652 | listen_id_priv->id.cm_handler, | |
653 | listen_id_priv->id.context); | |
654 | /* If the cm_id could not be created, ignore the request */ | |
655 | if (IS_ERR(cm_id)) | |
83b96586 | 656 | goto out; |
922a8e9f TT |
657 | |
658 | cm_id->provider_data = iw_event->provider_data; | |
659 | cm_id->local_addr = iw_event->local_addr; | |
660 | cm_id->remote_addr = iw_event->remote_addr; | |
661 | ||
662 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
663 | cm_id_priv->state = IW_CM_STATE_CONN_RECV; | |
664 | ||
3eae7c9f SW |
665 | /* |
666 | * We could be destroying the listening id. If so, ignore this | |
667 | * upcall. | |
668 | */ | |
669 | spin_lock_irqsave(&listen_id_priv->lock, flags); | |
670 | if (listen_id_priv->state != IW_CM_STATE_LISTEN) { | |
671 | spin_unlock_irqrestore(&listen_id_priv->lock, flags); | |
672 | iw_cm_reject(cm_id, NULL, 0); | |
673 | iw_destroy_cm_id(cm_id); | |
674 | goto out; | |
675 | } | |
676 | spin_unlock_irqrestore(&listen_id_priv->lock, flags); | |
677 | ||
922a8e9f TT |
678 | ret = alloc_work_entries(cm_id_priv, 3); |
679 | if (ret) { | |
680 | iw_cm_reject(cm_id, NULL, 0); | |
681 | iw_destroy_cm_id(cm_id); | |
83b96586 | 682 | goto out; |
922a8e9f TT |
683 | } |
684 | ||
685 | /* Call the client CM handler */ | |
686 | ret = cm_id->cm_handler(cm_id, iw_event); | |
687 | if (ret) { | |
ebb90986 | 688 | iw_cm_reject(cm_id, NULL, 0); |
922a8e9f TT |
689 | set_bit(IWCM_F_CALLBACK_DESTROY, &cm_id_priv->flags); |
690 | destroy_cm_id(cm_id); | |
691 | if (atomic_read(&cm_id_priv->refcount)==0) | |
ebb90986 | 692 | free_cm_id(cm_id_priv); |
922a8e9f TT |
693 | } |
694 | ||
83b96586 | 695 | out: |
922a8e9f TT |
696 | if (iw_event->private_data_len) |
697 | kfree(iw_event->private_data); | |
698 | } | |
699 | ||
700 | /* | |
701 | * Passive Side: CM_ID <-- ESTABLISHED | |
702 | * | |
703 | * The provider generated an ESTABLISHED event which means that | |
704 | * the MPA negotion has completed successfully and we are now in MPA | |
705 | * FPDU mode. | |
706 | * | |
707 | * This event can only be received in the CONN_RECV state. If the | |
708 | * remote peer closed, the ESTABLISHED event would be received followed | |
709 | * by the CLOSE event. If the app closes, it will block until we wake | |
710 | * it up after processing this event. | |
711 | */ | |
712 | static int cm_conn_est_handler(struct iwcm_id_private *cm_id_priv, | |
713 | struct iw_cm_event *iw_event) | |
714 | { | |
715 | unsigned long flags; | |
13fccdb3 | 716 | int ret; |
922a8e9f TT |
717 | |
718 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
719 | ||
720 | /* | |
721 | * We clear the CONNECT_WAIT bit here to allow the callback | |
722 | * function to call iw_cm_disconnect. Calling iw_destroy_cm_id | |
723 | * from a callback handler is not allowed. | |
724 | */ | |
725 | clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); | |
726 | BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_RECV); | |
727 | cm_id_priv->state = IW_CM_STATE_ESTABLISHED; | |
728 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
729 | ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event); | |
730 | wake_up_all(&cm_id_priv->connect_wait); | |
731 | ||
732 | return ret; | |
733 | } | |
734 | ||
735 | /* | |
736 | * Active Side: CM_ID <-- ESTABLISHED | |
737 | * | |
738 | * The app has called connect and is waiting for the established event to | |
739 | * post it's requests to the server. This event will wake up anyone | |
740 | * blocked in iw_cm_disconnect or iw_destroy_id. | |
741 | */ | |
742 | static int cm_conn_rep_handler(struct iwcm_id_private *cm_id_priv, | |
743 | struct iw_cm_event *iw_event) | |
744 | { | |
745 | unsigned long flags; | |
13fccdb3 | 746 | int ret; |
922a8e9f TT |
747 | |
748 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
749 | /* | |
750 | * Clear the connect wait bit so a callback function calling | |
751 | * iw_cm_disconnect will not wait and deadlock this thread | |
752 | */ | |
753 | clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); | |
754 | BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_SENT); | |
d0c49bf3 | 755 | if (iw_event->status == 0) { |
922a8e9f TT |
756 | cm_id_priv->id.local_addr = iw_event->local_addr; |
757 | cm_id_priv->id.remote_addr = iw_event->remote_addr; | |
758 | cm_id_priv->state = IW_CM_STATE_ESTABLISHED; | |
759 | } else { | |
760 | /* REJECTED or RESET */ | |
761 | cm_id_priv->id.device->iwcm->rem_ref(cm_id_priv->qp); | |
762 | cm_id_priv->qp = NULL; | |
763 | cm_id_priv->state = IW_CM_STATE_IDLE; | |
764 | } | |
765 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
766 | ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event); | |
767 | ||
768 | if (iw_event->private_data_len) | |
769 | kfree(iw_event->private_data); | |
770 | ||
771 | /* Wake up waiters on connect complete */ | |
772 | wake_up_all(&cm_id_priv->connect_wait); | |
773 | ||
774 | return ret; | |
775 | } | |
776 | ||
777 | /* | |
778 | * CM_ID <-- CLOSING | |
779 | * | |
780 | * If in the ESTABLISHED state, move to CLOSING. | |
781 | */ | |
782 | static void cm_disconnect_handler(struct iwcm_id_private *cm_id_priv, | |
783 | struct iw_cm_event *iw_event) | |
784 | { | |
785 | unsigned long flags; | |
786 | ||
787 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
788 | if (cm_id_priv->state == IW_CM_STATE_ESTABLISHED) | |
789 | cm_id_priv->state = IW_CM_STATE_CLOSING; | |
790 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
791 | } | |
792 | ||
793 | /* | |
794 | * CM_ID <-- IDLE | |
795 | * | |
796 | * If in the ESTBLISHED or CLOSING states, the QP will have have been | |
797 | * moved by the provider to the ERR state. Disassociate the CM_ID from | |
798 | * the QP, move to IDLE, and remove the 'connected' reference. | |
799 | * | |
800 | * If in some other state, the cm_id was destroyed asynchronously. | |
801 | * This is the last reference that will result in waking up | |
802 | * the app thread blocked in iw_destroy_cm_id. | |
803 | */ | |
804 | static int cm_close_handler(struct iwcm_id_private *cm_id_priv, | |
805 | struct iw_cm_event *iw_event) | |
806 | { | |
807 | unsigned long flags; | |
808 | int ret = 0; | |
809 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
810 | ||
811 | if (cm_id_priv->qp) { | |
812 | cm_id_priv->id.device->iwcm->rem_ref(cm_id_priv->qp); | |
813 | cm_id_priv->qp = NULL; | |
814 | } | |
815 | switch (cm_id_priv->state) { | |
816 | case IW_CM_STATE_ESTABLISHED: | |
817 | case IW_CM_STATE_CLOSING: | |
818 | cm_id_priv->state = IW_CM_STATE_IDLE; | |
819 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
820 | ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event); | |
821 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
822 | break; | |
823 | case IW_CM_STATE_DESTROYING: | |
824 | break; | |
825 | default: | |
826 | BUG(); | |
827 | } | |
828 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
829 | ||
830 | return ret; | |
831 | } | |
832 | ||
833 | static int process_event(struct iwcm_id_private *cm_id_priv, | |
834 | struct iw_cm_event *iw_event) | |
835 | { | |
836 | int ret = 0; | |
837 | ||
838 | switch (iw_event->event) { | |
839 | case IW_CM_EVENT_CONNECT_REQUEST: | |
840 | cm_conn_req_handler(cm_id_priv, iw_event); | |
841 | break; | |
842 | case IW_CM_EVENT_CONNECT_REPLY: | |
843 | ret = cm_conn_rep_handler(cm_id_priv, iw_event); | |
844 | break; | |
845 | case IW_CM_EVENT_ESTABLISHED: | |
846 | ret = cm_conn_est_handler(cm_id_priv, iw_event); | |
847 | break; | |
848 | case IW_CM_EVENT_DISCONNECT: | |
849 | cm_disconnect_handler(cm_id_priv, iw_event); | |
850 | break; | |
851 | case IW_CM_EVENT_CLOSE: | |
852 | ret = cm_close_handler(cm_id_priv, iw_event); | |
853 | break; | |
854 | default: | |
855 | BUG(); | |
856 | } | |
857 | ||
858 | return ret; | |
859 | } | |
860 | ||
861 | /* | |
862 | * Process events on the work_list for the cm_id. If the callback | |
863 | * function requests that the cm_id be deleted, a flag is set in the | |
864 | * cm_id flags to indicate that when the last reference is | |
865 | * removed, the cm_id is to be destroyed. This is necessary to | |
866 | * distinguish between an object that will be destroyed by the app | |
867 | * thread asleep on the destroy_comp list vs. an object destroyed | |
868 | * here synchronously when the last reference is removed. | |
869 | */ | |
c4028958 | 870 | static void cm_work_handler(struct work_struct *_work) |
922a8e9f | 871 | { |
4c1ac1b4 | 872 | struct iwcm_work *work = container_of(_work, struct iwcm_work, work); |
33ba0fa9 | 873 | struct iw_cm_event levent; |
922a8e9f TT |
874 | struct iwcm_id_private *cm_id_priv = work->cm_id; |
875 | unsigned long flags; | |
876 | int empty; | |
877 | int ret = 0; | |
d7c1fbd6 | 878 | int destroy_id; |
922a8e9f TT |
879 | |
880 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
881 | empty = list_empty(&cm_id_priv->work_list); | |
882 | while (!empty) { | |
883 | work = list_entry(cm_id_priv->work_list.next, | |
884 | struct iwcm_work, list); | |
885 | list_del_init(&work->list); | |
886 | empty = list_empty(&cm_id_priv->work_list); | |
33ba0fa9 | 887 | levent = work->event; |
922a8e9f TT |
888 | put_work(work); |
889 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
890 | ||
33ba0fa9 | 891 | ret = process_event(cm_id_priv, &levent); |
922a8e9f TT |
892 | if (ret) { |
893 | set_bit(IWCM_F_CALLBACK_DESTROY, &cm_id_priv->flags); | |
894 | destroy_cm_id(&cm_id_priv->id); | |
895 | } | |
896 | BUG_ON(atomic_read(&cm_id_priv->refcount)==0); | |
d7c1fbd6 | 897 | destroy_id = test_bit(IWCM_F_CALLBACK_DESTROY, &cm_id_priv->flags); |
ebb90986 | 898 | if (iwcm_deref_id(cm_id_priv)) { |
d7c1fbd6 | 899 | if (destroy_id) { |
ebb90986 SW |
900 | BUG_ON(!list_empty(&cm_id_priv->work_list)); |
901 | free_cm_id(cm_id_priv); | |
902 | } | |
922a8e9f TT |
903 | return; |
904 | } | |
e413a823 SW |
905 | if (empty) |
906 | return; | |
922a8e9f TT |
907 | spin_lock_irqsave(&cm_id_priv->lock, flags); |
908 | } | |
909 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
910 | } | |
911 | ||
912 | /* | |
913 | * This function is called on interrupt context. Schedule events on | |
914 | * the iwcm_wq thread to allow callback functions to downcall into | |
915 | * the CM and/or block. Events are queued to a per-CM_ID | |
916 | * work_list. If this is the first event on the work_list, the work | |
917 | * element is also queued on the iwcm_wq thread. | |
918 | * | |
919 | * Each event holds a reference on the cm_id. Until the last posted | |
920 | * event has been delivered and processed, the cm_id cannot be | |
921 | * deleted. | |
922 | * | |
923 | * Returns: | |
924 | * 0 - the event was handled. | |
925 | * -ENOMEM - the event was not handled due to lack of resources. | |
926 | */ | |
927 | static int cm_event_handler(struct iw_cm_id *cm_id, | |
928 | struct iw_cm_event *iw_event) | |
929 | { | |
930 | struct iwcm_work *work; | |
931 | struct iwcm_id_private *cm_id_priv; | |
932 | unsigned long flags; | |
933 | int ret = 0; | |
934 | ||
935 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
936 | ||
937 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
938 | work = get_work(cm_id_priv); | |
939 | if (!work) { | |
940 | ret = -ENOMEM; | |
941 | goto out; | |
942 | } | |
943 | ||
c4028958 | 944 | INIT_WORK(&work->work, cm_work_handler); |
922a8e9f TT |
945 | work->cm_id = cm_id_priv; |
946 | work->event = *iw_event; | |
947 | ||
948 | if ((work->event.event == IW_CM_EVENT_CONNECT_REQUEST || | |
949 | work->event.event == IW_CM_EVENT_CONNECT_REPLY) && | |
950 | work->event.private_data_len) { | |
715a588f | 951 | ret = copy_private_data(&work->event); |
922a8e9f TT |
952 | if (ret) { |
953 | put_work(work); | |
954 | goto out; | |
955 | } | |
956 | } | |
957 | ||
958 | atomic_inc(&cm_id_priv->refcount); | |
959 | if (list_empty(&cm_id_priv->work_list)) { | |
960 | list_add_tail(&work->list, &cm_id_priv->work_list); | |
961 | queue_work(iwcm_wq, &work->work); | |
962 | } else | |
963 | list_add_tail(&work->list, &cm_id_priv->work_list); | |
964 | out: | |
965 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
966 | return ret; | |
967 | } | |
968 | ||
969 | static int iwcm_init_qp_init_attr(struct iwcm_id_private *cm_id_priv, | |
970 | struct ib_qp_attr *qp_attr, | |
971 | int *qp_attr_mask) | |
972 | { | |
973 | unsigned long flags; | |
974 | int ret; | |
975 | ||
976 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
977 | switch (cm_id_priv->state) { | |
978 | case IW_CM_STATE_IDLE: | |
979 | case IW_CM_STATE_CONN_SENT: | |
980 | case IW_CM_STATE_CONN_RECV: | |
981 | case IW_CM_STATE_ESTABLISHED: | |
982 | *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS; | |
1ca8d156 | 983 | qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE| |
922a8e9f TT |
984 | IB_ACCESS_REMOTE_READ; |
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 | static int iwcm_init_qp_rts_attr(struct iwcm_id_private *cm_id_priv, | |
996 | struct ib_qp_attr *qp_attr, | |
997 | int *qp_attr_mask) | |
998 | { | |
999 | unsigned long flags; | |
1000 | int ret; | |
1001 | ||
1002 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
1003 | switch (cm_id_priv->state) { | |
1004 | case IW_CM_STATE_IDLE: | |
1005 | case IW_CM_STATE_CONN_SENT: | |
1006 | case IW_CM_STATE_CONN_RECV: | |
1007 | case IW_CM_STATE_ESTABLISHED: | |
1008 | *qp_attr_mask = 0; | |
1009 | ret = 0; | |
1010 | break; | |
1011 | default: | |
1012 | ret = -EINVAL; | |
1013 | break; | |
1014 | } | |
1015 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
1016 | return ret; | |
1017 | } | |
1018 | ||
1019 | int iw_cm_init_qp_attr(struct iw_cm_id *cm_id, | |
1020 | struct ib_qp_attr *qp_attr, | |
1021 | int *qp_attr_mask) | |
1022 | { | |
1023 | struct iwcm_id_private *cm_id_priv; | |
1024 | int ret; | |
1025 | ||
1026 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
1027 | switch (qp_attr->qp_state) { | |
1028 | case IB_QPS_INIT: | |
1029 | case IB_QPS_RTR: | |
1030 | ret = iwcm_init_qp_init_attr(cm_id_priv, | |
1031 | qp_attr, qp_attr_mask); | |
1032 | break; | |
1033 | case IB_QPS_RTS: | |
1034 | ret = iwcm_init_qp_rts_attr(cm_id_priv, | |
1035 | qp_attr, qp_attr_mask); | |
1036 | break; | |
1037 | default: | |
1038 | ret = -EINVAL; | |
1039 | break; | |
1040 | } | |
1041 | return ret; | |
1042 | } | |
1043 | EXPORT_SYMBOL(iw_cm_init_qp_attr); | |
1044 | ||
1045 | static int __init iw_cm_init(void) | |
1046 | { | |
1047 | iwcm_wq = create_singlethread_workqueue("iw_cm_wq"); | |
1048 | if (!iwcm_wq) | |
1049 | return -ENOMEM; | |
1050 | ||
2f0304d2 SW |
1051 | iwcm_ctl_table_hdr = register_net_sysctl(&init_net, "net/iw_cm", |
1052 | iwcm_ctl_table); | |
1053 | if (!iwcm_ctl_table_hdr) { | |
1054 | pr_err("iw_cm: couldn't register sysctl paths\n"); | |
1055 | destroy_workqueue(iwcm_wq); | |
1056 | return -ENOMEM; | |
1057 | } | |
1058 | ||
922a8e9f TT |
1059 | return 0; |
1060 | } | |
1061 | ||
1062 | static void __exit iw_cm_cleanup(void) | |
1063 | { | |
2f0304d2 | 1064 | unregister_net_sysctl_table(iwcm_ctl_table_hdr); |
922a8e9f TT |
1065 | destroy_workqueue(iwcm_wq); |
1066 | } | |
1067 | ||
1068 | module_init(iw_cm_init); | |
1069 | module_exit(iw_cm_cleanup); |