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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> | |
b493d91d FL |
53 | #include <rdma/iw_portmap.h> |
54 | #include <rdma/rdma_netlink.h> | |
922a8e9f TT |
55 | |
56 | #include "iwcm.h" | |
57 | ||
58 | MODULE_AUTHOR("Tom Tucker"); | |
59 | MODULE_DESCRIPTION("iWARP CM"); | |
60 | MODULE_LICENSE("Dual BSD/GPL"); | |
61 | ||
b493d91d FL |
62 | static struct ibnl_client_cbs iwcm_nl_cb_table[] = { |
63 | [RDMA_NL_IWPM_REG_PID] = {.dump = iwpm_register_pid_cb}, | |
64 | [RDMA_NL_IWPM_ADD_MAPPING] = {.dump = iwpm_add_mapping_cb}, | |
65 | [RDMA_NL_IWPM_QUERY_MAPPING] = {.dump = iwpm_add_and_query_mapping_cb}, | |
66 | [RDMA_NL_IWPM_REMOTE_INFO] = {.dump = iwpm_remote_info_cb}, | |
67 | [RDMA_NL_IWPM_HANDLE_ERR] = {.dump = iwpm_mapping_error_cb}, | |
68 | [RDMA_NL_IWPM_MAPINFO] = {.dump = iwpm_mapping_info_cb}, | |
69 | [RDMA_NL_IWPM_MAPINFO_NUM] = {.dump = iwpm_ack_mapping_info_cb} | |
70 | }; | |
71 | ||
922a8e9f TT |
72 | static struct workqueue_struct *iwcm_wq; |
73 | struct iwcm_work { | |
74 | struct work_struct work; | |
75 | struct iwcm_id_private *cm_id; | |
76 | struct list_head list; | |
77 | struct iw_cm_event event; | |
78 | struct list_head free_list; | |
79 | }; | |
80 | ||
2f0304d2 SW |
81 | static unsigned int default_backlog = 256; |
82 | ||
83 | static struct ctl_table_header *iwcm_ctl_table_hdr; | |
84 | static struct ctl_table iwcm_ctl_table[] = { | |
85 | { | |
86 | .procname = "default_backlog", | |
87 | .data = &default_backlog, | |
88 | .maxlen = sizeof(default_backlog), | |
89 | .mode = 0644, | |
90 | .proc_handler = proc_dointvec, | |
91 | }, | |
92 | { } | |
93 | }; | |
94 | ||
922a8e9f TT |
95 | /* |
96 | * The following services provide a mechanism for pre-allocating iwcm_work | |
97 | * elements. The design pre-allocates them based on the cm_id type: | |
98 | * LISTENING IDS: Get enough elements preallocated to handle the | |
99 | * listen backlog. | |
100 | * ACTIVE IDS: 4: CONNECT_REPLY, ESTABLISHED, DISCONNECT, CLOSE | |
101 | * PASSIVE IDS: 3: ESTABLISHED, DISCONNECT, CLOSE | |
102 | * | |
103 | * Allocating them in connect and listen avoids having to deal | |
104 | * with allocation failures on the event upcall from the provider (which | |
105 | * is called in the interrupt context). | |
106 | * | |
107 | * One exception is when creating the cm_id for incoming connection requests. | |
108 | * There are two cases: | |
109 | * 1) in the event upcall, cm_event_handler(), for a listening cm_id. If | |
110 | * the backlog is exceeded, then no more connection request events will | |
111 | * be processed. cm_event_handler() returns -ENOMEM in this case. Its up | |
715a588f | 112 | * to the provider to reject the connection request. |
922a8e9f TT |
113 | * 2) in the connection request workqueue handler, cm_conn_req_handler(). |
114 | * If work elements cannot be allocated for the new connect request cm_id, | |
115 | * then IWCM will call the provider reject method. This is ok since | |
116 | * cm_conn_req_handler() runs in the workqueue thread context. | |
117 | */ | |
118 | ||
119 | static struct iwcm_work *get_work(struct iwcm_id_private *cm_id_priv) | |
120 | { | |
121 | struct iwcm_work *work; | |
122 | ||
123 | if (list_empty(&cm_id_priv->work_free_list)) | |
124 | return NULL; | |
125 | work = list_entry(cm_id_priv->work_free_list.next, struct iwcm_work, | |
126 | free_list); | |
127 | list_del_init(&work->free_list); | |
128 | return work; | |
129 | } | |
130 | ||
131 | static void put_work(struct iwcm_work *work) | |
132 | { | |
133 | list_add(&work->free_list, &work->cm_id->work_free_list); | |
134 | } | |
135 | ||
136 | static void dealloc_work_entries(struct iwcm_id_private *cm_id_priv) | |
137 | { | |
138 | struct list_head *e, *tmp; | |
139 | ||
140 | list_for_each_safe(e, tmp, &cm_id_priv->work_free_list) | |
141 | kfree(list_entry(e, struct iwcm_work, free_list)); | |
142 | } | |
143 | ||
144 | static int alloc_work_entries(struct iwcm_id_private *cm_id_priv, int count) | |
145 | { | |
146 | struct iwcm_work *work; | |
147 | ||
148 | BUG_ON(!list_empty(&cm_id_priv->work_free_list)); | |
149 | while (count--) { | |
150 | work = kmalloc(sizeof(struct iwcm_work), GFP_KERNEL); | |
151 | if (!work) { | |
152 | dealloc_work_entries(cm_id_priv); | |
153 | return -ENOMEM; | |
154 | } | |
155 | work->cm_id = cm_id_priv; | |
156 | INIT_LIST_HEAD(&work->list); | |
157 | put_work(work); | |
158 | } | |
159 | return 0; | |
160 | } | |
161 | ||
162 | /* | |
715a588f KK |
163 | * Save private data from incoming connection requests to |
164 | * iw_cm_event, so the low level driver doesn't have to. Adjust | |
922a8e9f TT |
165 | * the event ptr to point to the local copy. |
166 | */ | |
715a588f | 167 | static int copy_private_data(struct iw_cm_event *event) |
922a8e9f TT |
168 | { |
169 | void *p; | |
170 | ||
bed8bdfd | 171 | p = kmemdup(event->private_data, event->private_data_len, GFP_ATOMIC); |
922a8e9f TT |
172 | if (!p) |
173 | return -ENOMEM; | |
922a8e9f TT |
174 | event->private_data = p; |
175 | return 0; | |
176 | } | |
177 | ||
ebb90986 SW |
178 | static void free_cm_id(struct iwcm_id_private *cm_id_priv) |
179 | { | |
180 | dealloc_work_entries(cm_id_priv); | |
181 | kfree(cm_id_priv); | |
182 | } | |
183 | ||
922a8e9f | 184 | /* |
9ab1ffa8 | 185 | * Release a reference on cm_id. If the last reference is being |
59c68ac3 | 186 | * released, free the cm_id and return 1. |
922a8e9f TT |
187 | */ |
188 | static int iwcm_deref_id(struct iwcm_id_private *cm_id_priv) | |
189 | { | |
922a8e9f TT |
190 | BUG_ON(atomic_read(&cm_id_priv->refcount)==0); |
191 | if (atomic_dec_and_test(&cm_id_priv->refcount)) { | |
192 | BUG_ON(!list_empty(&cm_id_priv->work_list)); | |
59c68ac3 | 193 | free_cm_id(cm_id_priv); |
ebb90986 | 194 | return 1; |
922a8e9f TT |
195 | } |
196 | ||
ebb90986 | 197 | return 0; |
922a8e9f TT |
198 | } |
199 | ||
200 | static void add_ref(struct iw_cm_id *cm_id) | |
201 | { | |
202 | struct iwcm_id_private *cm_id_priv; | |
203 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
204 | atomic_inc(&cm_id_priv->refcount); | |
205 | } | |
206 | ||
207 | static void rem_ref(struct iw_cm_id *cm_id) | |
208 | { | |
209 | struct iwcm_id_private *cm_id_priv; | |
6b59ba60 | 210 | |
922a8e9f | 211 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); |
6b59ba60 | 212 | |
59c68ac3 | 213 | (void)iwcm_deref_id(cm_id_priv); |
922a8e9f TT |
214 | } |
215 | ||
216 | static int cm_event_handler(struct iw_cm_id *cm_id, struct iw_cm_event *event); | |
217 | ||
218 | struct iw_cm_id *iw_create_cm_id(struct ib_device *device, | |
219 | iw_cm_handler cm_handler, | |
220 | void *context) | |
221 | { | |
222 | struct iwcm_id_private *cm_id_priv; | |
223 | ||
224 | cm_id_priv = kzalloc(sizeof(*cm_id_priv), GFP_KERNEL); | |
225 | if (!cm_id_priv) | |
226 | return ERR_PTR(-ENOMEM); | |
227 | ||
228 | cm_id_priv->state = IW_CM_STATE_IDLE; | |
229 | cm_id_priv->id.device = device; | |
230 | cm_id_priv->id.cm_handler = cm_handler; | |
231 | cm_id_priv->id.context = context; | |
232 | cm_id_priv->id.event_handler = cm_event_handler; | |
233 | cm_id_priv->id.add_ref = add_ref; | |
234 | cm_id_priv->id.rem_ref = rem_ref; | |
235 | spin_lock_init(&cm_id_priv->lock); | |
236 | atomic_set(&cm_id_priv->refcount, 1); | |
237 | init_waitqueue_head(&cm_id_priv->connect_wait); | |
238 | init_completion(&cm_id_priv->destroy_comp); | |
239 | INIT_LIST_HEAD(&cm_id_priv->work_list); | |
240 | INIT_LIST_HEAD(&cm_id_priv->work_free_list); | |
241 | ||
242 | return &cm_id_priv->id; | |
243 | } | |
244 | EXPORT_SYMBOL(iw_create_cm_id); | |
245 | ||
246 | ||
247 | static int iwcm_modify_qp_err(struct ib_qp *qp) | |
248 | { | |
249 | struct ib_qp_attr qp_attr; | |
250 | ||
251 | if (!qp) | |
252 | return -EINVAL; | |
253 | ||
254 | qp_attr.qp_state = IB_QPS_ERR; | |
255 | return ib_modify_qp(qp, &qp_attr, IB_QP_STATE); | |
256 | } | |
257 | ||
258 | /* | |
259 | * This is really the RDMAC CLOSING state. It is most similar to the | |
260 | * IB SQD QP state. | |
261 | */ | |
262 | static int iwcm_modify_qp_sqd(struct ib_qp *qp) | |
263 | { | |
264 | struct ib_qp_attr qp_attr; | |
265 | ||
266 | BUG_ON(qp == NULL); | |
267 | qp_attr.qp_state = IB_QPS_SQD; | |
268 | return ib_modify_qp(qp, &qp_attr, IB_QP_STATE); | |
269 | } | |
270 | ||
271 | /* | |
272 | * CM_ID <-- CLOSING | |
273 | * | |
715a588f | 274 | * Block if a passive or active connection is currently being processed. Then |
922a8e9f TT |
275 | * process the event as follows: |
276 | * - If we are ESTABLISHED, move to CLOSING and modify the QP state | |
277 | * based on the abrupt flag | |
278 | * - If the connection is already in the CLOSING or IDLE state, the peer is | |
279 | * disconnecting concurrently with us and we've already seen the | |
280 | * DISCONNECT event -- ignore the request and return 0 | |
281 | * - Disconnect on a listening endpoint returns -EINVAL | |
282 | */ | |
283 | int iw_cm_disconnect(struct iw_cm_id *cm_id, int abrupt) | |
284 | { | |
285 | struct iwcm_id_private *cm_id_priv; | |
286 | unsigned long flags; | |
287 | int ret = 0; | |
288 | struct ib_qp *qp = NULL; | |
289 | ||
290 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
291 | /* Wait if we're currently in a connect or accept downcall */ | |
292 | wait_event(cm_id_priv->connect_wait, | |
293 | !test_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags)); | |
294 | ||
295 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
296 | switch (cm_id_priv->state) { | |
297 | case IW_CM_STATE_ESTABLISHED: | |
298 | cm_id_priv->state = IW_CM_STATE_CLOSING; | |
299 | ||
300 | /* QP could be <nul> for user-mode client */ | |
301 | if (cm_id_priv->qp) | |
302 | qp = cm_id_priv->qp; | |
303 | else | |
304 | ret = -EINVAL; | |
305 | break; | |
306 | case IW_CM_STATE_LISTEN: | |
307 | ret = -EINVAL; | |
308 | break; | |
309 | case IW_CM_STATE_CLOSING: | |
310 | /* remote peer closed first */ | |
311 | case IW_CM_STATE_IDLE: | |
312 | /* accept or connect returned !0 */ | |
313 | break; | |
314 | case IW_CM_STATE_CONN_RECV: | |
315 | /* | |
316 | * App called disconnect before/without calling accept after | |
317 | * connect_request event delivered. | |
318 | */ | |
319 | break; | |
320 | case IW_CM_STATE_CONN_SENT: | |
321 | /* Can only get here if wait above fails */ | |
322 | default: | |
323 | BUG(); | |
324 | } | |
325 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
326 | ||
327 | if (qp) { | |
328 | if (abrupt) | |
329 | ret = iwcm_modify_qp_err(qp); | |
330 | else | |
331 | ret = iwcm_modify_qp_sqd(qp); | |
332 | ||
333 | /* | |
334 | * If both sides are disconnecting the QP could | |
335 | * already be in ERR or SQD states | |
336 | */ | |
337 | ret = 0; | |
338 | } | |
339 | ||
340 | return ret; | |
341 | } | |
342 | EXPORT_SYMBOL(iw_cm_disconnect); | |
343 | ||
344 | /* | |
345 | * CM_ID <-- DESTROYING | |
346 | * | |
347 | * Clean up all resources associated with the connection and release | |
348 | * the initial reference taken by iw_create_cm_id. | |
349 | */ | |
350 | static void destroy_cm_id(struct iw_cm_id *cm_id) | |
351 | { | |
352 | struct iwcm_id_private *cm_id_priv; | |
353 | unsigned long flags; | |
922a8e9f TT |
354 | |
355 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
356 | /* | |
357 | * Wait if we're currently in a connect or accept downcall. A | |
358 | * listening endpoint should never block here. | |
359 | */ | |
360 | wait_event(cm_id_priv->connect_wait, | |
361 | !test_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags)); | |
362 | ||
59c68ac3 SW |
363 | /* |
364 | * Since we're deleting the cm_id, drop any events that | |
365 | * might arrive before the last dereference. | |
366 | */ | |
367 | set_bit(IWCM_F_DROP_EVENTS, &cm_id_priv->flags); | |
368 | ||
922a8e9f TT |
369 | spin_lock_irqsave(&cm_id_priv->lock, flags); |
370 | switch (cm_id_priv->state) { | |
371 | case IW_CM_STATE_LISTEN: | |
372 | cm_id_priv->state = IW_CM_STATE_DESTROYING; | |
373 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
374 | /* destroy the listening endpoint */ | |
05633102 | 375 | cm_id->device->iwcm->destroy_listen(cm_id); |
922a8e9f TT |
376 | spin_lock_irqsave(&cm_id_priv->lock, flags); |
377 | break; | |
378 | case IW_CM_STATE_ESTABLISHED: | |
379 | cm_id_priv->state = IW_CM_STATE_DESTROYING; | |
380 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
381 | /* Abrupt close of the connection */ | |
382 | (void)iwcm_modify_qp_err(cm_id_priv->qp); | |
383 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
384 | break; | |
385 | case IW_CM_STATE_IDLE: | |
386 | case IW_CM_STATE_CLOSING: | |
387 | cm_id_priv->state = IW_CM_STATE_DESTROYING; | |
388 | break; | |
389 | case IW_CM_STATE_CONN_RECV: | |
390 | /* | |
391 | * App called destroy before/without calling accept after | |
ebb90986 SW |
392 | * receiving connection request event notification or |
393 | * returned non zero from the event callback function. | |
394 | * In either case, must tell the provider to reject. | |
922a8e9f TT |
395 | */ |
396 | cm_id_priv->state = IW_CM_STATE_DESTROYING; | |
54e05f15 | 397 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); |
cb58160e | 398 | cm_id->device->iwcm->reject(cm_id, NULL, 0); |
54e05f15 | 399 | spin_lock_irqsave(&cm_id_priv->lock, flags); |
922a8e9f TT |
400 | break; |
401 | case IW_CM_STATE_CONN_SENT: | |
402 | case IW_CM_STATE_DESTROYING: | |
403 | default: | |
404 | BUG(); | |
405 | break; | |
406 | } | |
407 | if (cm_id_priv->qp) { | |
408 | cm_id_priv->id.device->iwcm->rem_ref(cm_id_priv->qp); | |
409 | cm_id_priv->qp = NULL; | |
410 | } | |
411 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
412 | ||
b493d91d FL |
413 | if (cm_id->mapped) { |
414 | iwpm_remove_mapinfo(&cm_id->local_addr, &cm_id->m_local_addr); | |
415 | iwpm_remove_mapping(&cm_id->local_addr, RDMA_NL_IWCM); | |
416 | } | |
417 | ||
922a8e9f TT |
418 | (void)iwcm_deref_id(cm_id_priv); |
419 | } | |
420 | ||
421 | /* | |
422 | * This function is only called by the application thread and cannot | |
423 | * be called by the event thread. The function will wait for all | |
424 | * references to be released on the cm_id and then kfree the cm_id | |
425 | * object. | |
426 | */ | |
427 | void iw_destroy_cm_id(struct iw_cm_id *cm_id) | |
428 | { | |
429 | struct iwcm_id_private *cm_id_priv; | |
430 | ||
431 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
922a8e9f | 432 | destroy_cm_id(cm_id); |
922a8e9f TT |
433 | } |
434 | EXPORT_SYMBOL(iw_destroy_cm_id); | |
435 | ||
b493d91d FL |
436 | /** |
437 | * iw_cm_check_wildcard - If IP address is 0 then use original | |
438 | * @pm_addr: sockaddr containing the ip to check for wildcard | |
439 | * @cm_addr: sockaddr containing the actual IP address | |
440 | * @cm_outaddr: sockaddr to set IP addr which leaving port | |
441 | * | |
442 | * Checks the pm_addr for wildcard and then sets cm_outaddr's | |
443 | * IP to the actual (cm_addr). | |
444 | */ | |
445 | static void iw_cm_check_wildcard(struct sockaddr_storage *pm_addr, | |
446 | struct sockaddr_storage *cm_addr, | |
447 | struct sockaddr_storage *cm_outaddr) | |
448 | { | |
449 | if (pm_addr->ss_family == AF_INET) { | |
450 | struct sockaddr_in *pm4_addr = (struct sockaddr_in *)pm_addr; | |
451 | ||
825107a2 | 452 | if (pm4_addr->sin_addr.s_addr == htonl(INADDR_ANY)) { |
b493d91d FL |
453 | struct sockaddr_in *cm4_addr = |
454 | (struct sockaddr_in *)cm_addr; | |
455 | struct sockaddr_in *cm4_outaddr = | |
456 | (struct sockaddr_in *)cm_outaddr; | |
457 | ||
458 | cm4_outaddr->sin_addr = cm4_addr->sin_addr; | |
459 | } | |
460 | } else { | |
461 | struct sockaddr_in6 *pm6_addr = (struct sockaddr_in6 *)pm_addr; | |
462 | ||
463 | if (ipv6_addr_type(&pm6_addr->sin6_addr) == IPV6_ADDR_ANY) { | |
464 | struct sockaddr_in6 *cm6_addr = | |
465 | (struct sockaddr_in6 *)cm_addr; | |
466 | struct sockaddr_in6 *cm6_outaddr = | |
467 | (struct sockaddr_in6 *)cm_outaddr; | |
468 | ||
469 | cm6_outaddr->sin6_addr = cm6_addr->sin6_addr; | |
470 | } | |
471 | } | |
472 | } | |
473 | ||
474 | /** | |
475 | * iw_cm_map - Use portmapper to map the ports | |
476 | * @cm_id: connection manager pointer | |
477 | * @active: Indicates the active side when true | |
478 | * returns nonzero for error only if iwpm_create_mapinfo() fails | |
479 | * | |
480 | * Tries to add a mapping for a port using the Portmapper. If | |
481 | * successful in mapping the IP/Port it will check the remote | |
482 | * mapped IP address for a wildcard IP address and replace the | |
483 | * zero IP address with the remote_addr. | |
484 | */ | |
485 | static int iw_cm_map(struct iw_cm_id *cm_id, bool active) | |
486 | { | |
487 | struct iwpm_dev_data pm_reg_msg; | |
488 | struct iwpm_sa_data pm_msg; | |
489 | int status; | |
490 | ||
491 | cm_id->m_local_addr = cm_id->local_addr; | |
492 | cm_id->m_remote_addr = cm_id->remote_addr; | |
493 | ||
494 | memcpy(pm_reg_msg.dev_name, cm_id->device->name, | |
495 | sizeof(pm_reg_msg.dev_name)); | |
496 | memcpy(pm_reg_msg.if_name, cm_id->device->iwcm->ifname, | |
497 | sizeof(pm_reg_msg.if_name)); | |
498 | ||
499 | if (iwpm_register_pid(&pm_reg_msg, RDMA_NL_IWCM) || | |
500 | !iwpm_valid_pid()) | |
501 | return 0; | |
502 | ||
503 | cm_id->mapped = true; | |
504 | pm_msg.loc_addr = cm_id->local_addr; | |
505 | pm_msg.rem_addr = cm_id->remote_addr; | |
506 | if (active) | |
507 | status = iwpm_add_and_query_mapping(&pm_msg, | |
508 | RDMA_NL_IWCM); | |
509 | else | |
510 | status = iwpm_add_mapping(&pm_msg, RDMA_NL_IWCM); | |
511 | ||
512 | if (!status) { | |
513 | cm_id->m_local_addr = pm_msg.mapped_loc_addr; | |
514 | if (active) { | |
515 | cm_id->m_remote_addr = pm_msg.mapped_rem_addr; | |
516 | iw_cm_check_wildcard(&pm_msg.mapped_rem_addr, | |
517 | &cm_id->remote_addr, | |
518 | &cm_id->m_remote_addr); | |
519 | } | |
520 | } | |
521 | ||
522 | return iwpm_create_mapinfo(&cm_id->local_addr, | |
523 | &cm_id->m_local_addr, | |
524 | RDMA_NL_IWCM); | |
525 | } | |
526 | ||
922a8e9f TT |
527 | /* |
528 | * CM_ID <-- LISTEN | |
529 | * | |
530 | * Start listening for connect requests. Generates one CONNECT_REQUEST | |
531 | * event for each inbound connect request. | |
532 | */ | |
533 | int iw_cm_listen(struct iw_cm_id *cm_id, int backlog) | |
534 | { | |
535 | struct iwcm_id_private *cm_id_priv; | |
536 | unsigned long flags; | |
13fccdb3 | 537 | int ret; |
922a8e9f TT |
538 | |
539 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
540 | ||
2f0304d2 SW |
541 | if (!backlog) |
542 | backlog = default_backlog; | |
543 | ||
922a8e9f TT |
544 | ret = alloc_work_entries(cm_id_priv, backlog); |
545 | if (ret) | |
546 | return ret; | |
547 | ||
548 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
549 | switch (cm_id_priv->state) { | |
550 | case IW_CM_STATE_IDLE: | |
551 | cm_id_priv->state = IW_CM_STATE_LISTEN; | |
552 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
b493d91d FL |
553 | ret = iw_cm_map(cm_id, false); |
554 | if (!ret) | |
555 | ret = cm_id->device->iwcm->create_listen(cm_id, backlog); | |
922a8e9f TT |
556 | if (ret) |
557 | cm_id_priv->state = IW_CM_STATE_IDLE; | |
558 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
559 | break; | |
560 | default: | |
561 | ret = -EINVAL; | |
562 | } | |
563 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
564 | ||
565 | return ret; | |
566 | } | |
567 | EXPORT_SYMBOL(iw_cm_listen); | |
568 | ||
569 | /* | |
570 | * CM_ID <-- IDLE | |
571 | * | |
572 | * Rejects an inbound connection request. No events are generated. | |
573 | */ | |
574 | int iw_cm_reject(struct iw_cm_id *cm_id, | |
575 | const void *private_data, | |
576 | u8 private_data_len) | |
577 | { | |
578 | struct iwcm_id_private *cm_id_priv; | |
579 | unsigned long flags; | |
580 | int ret; | |
581 | ||
582 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
583 | set_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); | |
584 | ||
585 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
586 | if (cm_id_priv->state != IW_CM_STATE_CONN_RECV) { | |
587 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
588 | clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); | |
589 | wake_up_all(&cm_id_priv->connect_wait); | |
590 | return -EINVAL; | |
591 | } | |
592 | cm_id_priv->state = IW_CM_STATE_IDLE; | |
593 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
594 | ||
595 | ret = cm_id->device->iwcm->reject(cm_id, private_data, | |
596 | private_data_len); | |
597 | ||
598 | clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); | |
599 | wake_up_all(&cm_id_priv->connect_wait); | |
600 | ||
601 | return ret; | |
602 | } | |
603 | EXPORT_SYMBOL(iw_cm_reject); | |
604 | ||
605 | /* | |
606 | * CM_ID <-- ESTABLISHED | |
607 | * | |
608 | * Accepts an inbound connection request and generates an ESTABLISHED | |
609 | * event. Callers of iw_cm_disconnect and iw_destroy_cm_id will block | |
610 | * until the ESTABLISHED event is received from the provider. | |
611 | */ | |
612 | int iw_cm_accept(struct iw_cm_id *cm_id, | |
613 | struct iw_cm_conn_param *iw_param) | |
614 | { | |
615 | struct iwcm_id_private *cm_id_priv; | |
616 | struct ib_qp *qp; | |
617 | unsigned long flags; | |
618 | int ret; | |
619 | ||
620 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
621 | set_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); | |
622 | ||
623 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
624 | if (cm_id_priv->state != IW_CM_STATE_CONN_RECV) { | |
625 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
626 | clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); | |
627 | wake_up_all(&cm_id_priv->connect_wait); | |
628 | return -EINVAL; | |
629 | } | |
630 | /* Get the ib_qp given the QPN */ | |
631 | qp = cm_id->device->iwcm->get_qp(cm_id->device, iw_param->qpn); | |
632 | if (!qp) { | |
633 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
26012f07 AT |
634 | clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); |
635 | wake_up_all(&cm_id_priv->connect_wait); | |
922a8e9f TT |
636 | return -EINVAL; |
637 | } | |
638 | cm_id->device->iwcm->add_ref(qp); | |
639 | cm_id_priv->qp = qp; | |
640 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
641 | ||
642 | ret = cm_id->device->iwcm->accept(cm_id, iw_param); | |
643 | if (ret) { | |
644 | /* An error on accept precludes provider events */ | |
645 | BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_RECV); | |
646 | cm_id_priv->state = IW_CM_STATE_IDLE; | |
647 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
648 | if (cm_id_priv->qp) { | |
649 | cm_id->device->iwcm->rem_ref(qp); | |
650 | cm_id_priv->qp = NULL; | |
651 | } | |
652 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
653 | clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); | |
654 | wake_up_all(&cm_id_priv->connect_wait); | |
655 | } | |
656 | ||
657 | return ret; | |
658 | } | |
659 | EXPORT_SYMBOL(iw_cm_accept); | |
660 | ||
661 | /* | |
662 | * Active Side: CM_ID <-- CONN_SENT | |
663 | * | |
664 | * If successful, results in the generation of a CONNECT_REPLY | |
665 | * event. iw_cm_disconnect and iw_cm_destroy will block until the | |
666 | * CONNECT_REPLY event is received from the provider. | |
667 | */ | |
668 | int iw_cm_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *iw_param) | |
669 | { | |
670 | struct iwcm_id_private *cm_id_priv; | |
13fccdb3 | 671 | int ret; |
922a8e9f TT |
672 | unsigned long flags; |
673 | struct ib_qp *qp; | |
674 | ||
675 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
676 | ||
677 | ret = alloc_work_entries(cm_id_priv, 4); | |
678 | if (ret) | |
679 | return ret; | |
680 | ||
681 | set_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); | |
682 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
683 | ||
684 | if (cm_id_priv->state != IW_CM_STATE_IDLE) { | |
b493d91d FL |
685 | ret = -EINVAL; |
686 | goto err; | |
922a8e9f TT |
687 | } |
688 | ||
689 | /* Get the ib_qp given the QPN */ | |
690 | qp = cm_id->device->iwcm->get_qp(cm_id->device, iw_param->qpn); | |
691 | if (!qp) { | |
b493d91d FL |
692 | ret = -EINVAL; |
693 | goto err; | |
922a8e9f TT |
694 | } |
695 | cm_id->device->iwcm->add_ref(qp); | |
696 | cm_id_priv->qp = qp; | |
697 | cm_id_priv->state = IW_CM_STATE_CONN_SENT; | |
698 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
699 | ||
b493d91d FL |
700 | ret = iw_cm_map(cm_id, true); |
701 | if (!ret) | |
702 | ret = cm_id->device->iwcm->connect(cm_id, iw_param); | |
703 | if (!ret) | |
704 | return 0; /* success */ | |
922a8e9f | 705 | |
b493d91d FL |
706 | spin_lock_irqsave(&cm_id_priv->lock, flags); |
707 | if (cm_id_priv->qp) { | |
708 | cm_id->device->iwcm->rem_ref(qp); | |
709 | cm_id_priv->qp = NULL; | |
710 | } | |
711 | cm_id_priv->state = IW_CM_STATE_IDLE; | |
712 | err: | |
713 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
714 | clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); | |
715 | wake_up_all(&cm_id_priv->connect_wait); | |
922a8e9f TT |
716 | return ret; |
717 | } | |
718 | EXPORT_SYMBOL(iw_cm_connect); | |
719 | ||
720 | /* | |
721 | * Passive Side: new CM_ID <-- CONN_RECV | |
722 | * | |
723 | * Handles an inbound connect request. The function creates a new | |
724 | * iw_cm_id to represent the new connection and inherits the client | |
725 | * callback function and other attributes from the listening parent. | |
726 | * | |
727 | * The work item contains a pointer to the listen_cm_id and the event. The | |
728 | * listen_cm_id contains the client cm_handler, context and | |
729 | * device. These are copied when the device is cloned. The event | |
730 | * contains the new four tuple. | |
731 | * | |
732 | * An error on the child should not affect the parent, so this | |
733 | * function does not return a value. | |
734 | */ | |
735 | static void cm_conn_req_handler(struct iwcm_id_private *listen_id_priv, | |
736 | struct iw_cm_event *iw_event) | |
737 | { | |
738 | unsigned long flags; | |
739 | struct iw_cm_id *cm_id; | |
740 | struct iwcm_id_private *cm_id_priv; | |
741 | int ret; | |
742 | ||
743 | /* | |
744 | * The provider should never generate a connection request | |
745 | * event with a bad status. | |
746 | */ | |
747 | BUG_ON(iw_event->status); | |
748 | ||
922a8e9f TT |
749 | cm_id = iw_create_cm_id(listen_id_priv->id.device, |
750 | listen_id_priv->id.cm_handler, | |
751 | listen_id_priv->id.context); | |
752 | /* If the cm_id could not be created, ignore the request */ | |
753 | if (IS_ERR(cm_id)) | |
83b96586 | 754 | goto out; |
922a8e9f TT |
755 | |
756 | cm_id->provider_data = iw_event->provider_data; | |
b493d91d FL |
757 | cm_id->m_local_addr = iw_event->local_addr; |
758 | cm_id->m_remote_addr = iw_event->remote_addr; | |
759 | cm_id->local_addr = listen_id_priv->id.local_addr; | |
760 | ||
761 | ret = iwpm_get_remote_info(&listen_id_priv->id.m_local_addr, | |
762 | &iw_event->remote_addr, | |
763 | &cm_id->remote_addr, | |
764 | RDMA_NL_IWCM); | |
765 | if (ret) { | |
766 | cm_id->remote_addr = iw_event->remote_addr; | |
767 | } else { | |
768 | iw_cm_check_wildcard(&listen_id_priv->id.m_local_addr, | |
769 | &iw_event->local_addr, | |
770 | &cm_id->local_addr); | |
771 | iw_event->local_addr = cm_id->local_addr; | |
772 | iw_event->remote_addr = cm_id->remote_addr; | |
773 | } | |
922a8e9f TT |
774 | |
775 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
776 | cm_id_priv->state = IW_CM_STATE_CONN_RECV; | |
777 | ||
3eae7c9f SW |
778 | /* |
779 | * We could be destroying the listening id. If so, ignore this | |
780 | * upcall. | |
781 | */ | |
782 | spin_lock_irqsave(&listen_id_priv->lock, flags); | |
783 | if (listen_id_priv->state != IW_CM_STATE_LISTEN) { | |
784 | spin_unlock_irqrestore(&listen_id_priv->lock, flags); | |
785 | iw_cm_reject(cm_id, NULL, 0); | |
786 | iw_destroy_cm_id(cm_id); | |
787 | goto out; | |
788 | } | |
789 | spin_unlock_irqrestore(&listen_id_priv->lock, flags); | |
790 | ||
922a8e9f TT |
791 | ret = alloc_work_entries(cm_id_priv, 3); |
792 | if (ret) { | |
793 | iw_cm_reject(cm_id, NULL, 0); | |
794 | iw_destroy_cm_id(cm_id); | |
83b96586 | 795 | goto out; |
922a8e9f TT |
796 | } |
797 | ||
798 | /* Call the client CM handler */ | |
799 | ret = cm_id->cm_handler(cm_id, iw_event); | |
800 | if (ret) { | |
ebb90986 | 801 | iw_cm_reject(cm_id, NULL, 0); |
59c68ac3 | 802 | iw_destroy_cm_id(cm_id); |
922a8e9f TT |
803 | } |
804 | ||
83b96586 | 805 | out: |
922a8e9f TT |
806 | if (iw_event->private_data_len) |
807 | kfree(iw_event->private_data); | |
808 | } | |
809 | ||
810 | /* | |
811 | * Passive Side: CM_ID <-- ESTABLISHED | |
812 | * | |
813 | * The provider generated an ESTABLISHED event which means that | |
814 | * the MPA negotion has completed successfully and we are now in MPA | |
815 | * FPDU mode. | |
816 | * | |
817 | * This event can only be received in the CONN_RECV state. If the | |
818 | * remote peer closed, the ESTABLISHED event would be received followed | |
819 | * by the CLOSE event. If the app closes, it will block until we wake | |
820 | * it up after processing this event. | |
821 | */ | |
822 | static int cm_conn_est_handler(struct iwcm_id_private *cm_id_priv, | |
823 | struct iw_cm_event *iw_event) | |
824 | { | |
825 | unsigned long flags; | |
13fccdb3 | 826 | int ret; |
922a8e9f TT |
827 | |
828 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
829 | ||
830 | /* | |
831 | * We clear the CONNECT_WAIT bit here to allow the callback | |
832 | * function to call iw_cm_disconnect. Calling iw_destroy_cm_id | |
833 | * from a callback handler is not allowed. | |
834 | */ | |
835 | clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); | |
836 | BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_RECV); | |
837 | cm_id_priv->state = IW_CM_STATE_ESTABLISHED; | |
838 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
839 | ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event); | |
840 | wake_up_all(&cm_id_priv->connect_wait); | |
841 | ||
842 | return ret; | |
843 | } | |
844 | ||
845 | /* | |
846 | * Active Side: CM_ID <-- ESTABLISHED | |
847 | * | |
848 | * The app has called connect and is waiting for the established event to | |
849 | * post it's requests to the server. This event will wake up anyone | |
850 | * blocked in iw_cm_disconnect or iw_destroy_id. | |
851 | */ | |
852 | static int cm_conn_rep_handler(struct iwcm_id_private *cm_id_priv, | |
853 | struct iw_cm_event *iw_event) | |
854 | { | |
855 | unsigned long flags; | |
13fccdb3 | 856 | int ret; |
922a8e9f TT |
857 | |
858 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
859 | /* | |
860 | * Clear the connect wait bit so a callback function calling | |
861 | * iw_cm_disconnect will not wait and deadlock this thread | |
862 | */ | |
863 | clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); | |
864 | BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_SENT); | |
d0c49bf3 | 865 | if (iw_event->status == 0) { |
b493d91d FL |
866 | cm_id_priv->id.m_local_addr = iw_event->local_addr; |
867 | cm_id_priv->id.m_remote_addr = iw_event->remote_addr; | |
868 | iw_event->local_addr = cm_id_priv->id.local_addr; | |
869 | iw_event->remote_addr = cm_id_priv->id.remote_addr; | |
922a8e9f TT |
870 | cm_id_priv->state = IW_CM_STATE_ESTABLISHED; |
871 | } else { | |
872 | /* REJECTED or RESET */ | |
873 | cm_id_priv->id.device->iwcm->rem_ref(cm_id_priv->qp); | |
874 | cm_id_priv->qp = NULL; | |
875 | cm_id_priv->state = IW_CM_STATE_IDLE; | |
876 | } | |
877 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
878 | ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event); | |
879 | ||
880 | if (iw_event->private_data_len) | |
881 | kfree(iw_event->private_data); | |
882 | ||
883 | /* Wake up waiters on connect complete */ | |
884 | wake_up_all(&cm_id_priv->connect_wait); | |
885 | ||
886 | return ret; | |
887 | } | |
888 | ||
889 | /* | |
890 | * CM_ID <-- CLOSING | |
891 | * | |
892 | * If in the ESTABLISHED state, move to CLOSING. | |
893 | */ | |
894 | static void cm_disconnect_handler(struct iwcm_id_private *cm_id_priv, | |
895 | struct iw_cm_event *iw_event) | |
896 | { | |
897 | unsigned long flags; | |
898 | ||
899 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
900 | if (cm_id_priv->state == IW_CM_STATE_ESTABLISHED) | |
901 | cm_id_priv->state = IW_CM_STATE_CLOSING; | |
902 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
903 | } | |
904 | ||
905 | /* | |
906 | * CM_ID <-- IDLE | |
907 | * | |
908 | * If in the ESTBLISHED or CLOSING states, the QP will have have been | |
909 | * moved by the provider to the ERR state. Disassociate the CM_ID from | |
910 | * the QP, move to IDLE, and remove the 'connected' reference. | |
911 | * | |
912 | * If in some other state, the cm_id was destroyed asynchronously. | |
913 | * This is the last reference that will result in waking up | |
914 | * the app thread blocked in iw_destroy_cm_id. | |
915 | */ | |
916 | static int cm_close_handler(struct iwcm_id_private *cm_id_priv, | |
917 | struct iw_cm_event *iw_event) | |
918 | { | |
919 | unsigned long flags; | |
920 | int ret = 0; | |
921 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
922 | ||
923 | if (cm_id_priv->qp) { | |
924 | cm_id_priv->id.device->iwcm->rem_ref(cm_id_priv->qp); | |
925 | cm_id_priv->qp = NULL; | |
926 | } | |
927 | switch (cm_id_priv->state) { | |
928 | case IW_CM_STATE_ESTABLISHED: | |
929 | case IW_CM_STATE_CLOSING: | |
930 | cm_id_priv->state = IW_CM_STATE_IDLE; | |
931 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
932 | ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event); | |
933 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
934 | break; | |
935 | case IW_CM_STATE_DESTROYING: | |
936 | break; | |
937 | default: | |
938 | BUG(); | |
939 | } | |
940 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
941 | ||
942 | return ret; | |
943 | } | |
944 | ||
945 | static int process_event(struct iwcm_id_private *cm_id_priv, | |
946 | struct iw_cm_event *iw_event) | |
947 | { | |
948 | int ret = 0; | |
949 | ||
950 | switch (iw_event->event) { | |
951 | case IW_CM_EVENT_CONNECT_REQUEST: | |
952 | cm_conn_req_handler(cm_id_priv, iw_event); | |
953 | break; | |
954 | case IW_CM_EVENT_CONNECT_REPLY: | |
955 | ret = cm_conn_rep_handler(cm_id_priv, iw_event); | |
956 | break; | |
957 | case IW_CM_EVENT_ESTABLISHED: | |
958 | ret = cm_conn_est_handler(cm_id_priv, iw_event); | |
959 | break; | |
960 | case IW_CM_EVENT_DISCONNECT: | |
961 | cm_disconnect_handler(cm_id_priv, iw_event); | |
962 | break; | |
963 | case IW_CM_EVENT_CLOSE: | |
964 | ret = cm_close_handler(cm_id_priv, iw_event); | |
965 | break; | |
966 | default: | |
967 | BUG(); | |
968 | } | |
969 | ||
970 | return ret; | |
971 | } | |
972 | ||
973 | /* | |
974 | * Process events on the work_list for the cm_id. If the callback | |
975 | * function requests that the cm_id be deleted, a flag is set in the | |
976 | * cm_id flags to indicate that when the last reference is | |
977 | * removed, the cm_id is to be destroyed. This is necessary to | |
978 | * distinguish between an object that will be destroyed by the app | |
979 | * thread asleep on the destroy_comp list vs. an object destroyed | |
980 | * here synchronously when the last reference is removed. | |
981 | */ | |
c4028958 | 982 | static void cm_work_handler(struct work_struct *_work) |
922a8e9f | 983 | { |
4c1ac1b4 | 984 | struct iwcm_work *work = container_of(_work, struct iwcm_work, work); |
33ba0fa9 | 985 | struct iw_cm_event levent; |
922a8e9f TT |
986 | struct iwcm_id_private *cm_id_priv = work->cm_id; |
987 | unsigned long flags; | |
988 | int empty; | |
989 | int ret = 0; | |
990 | ||
991 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
992 | empty = list_empty(&cm_id_priv->work_list); | |
993 | while (!empty) { | |
994 | work = list_entry(cm_id_priv->work_list.next, | |
995 | struct iwcm_work, list); | |
996 | list_del_init(&work->list); | |
997 | empty = list_empty(&cm_id_priv->work_list); | |
33ba0fa9 | 998 | levent = work->event; |
922a8e9f TT |
999 | put_work(work); |
1000 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
1001 | ||
59c68ac3 SW |
1002 | if (!test_bit(IWCM_F_DROP_EVENTS, &cm_id_priv->flags)) { |
1003 | ret = process_event(cm_id_priv, &levent); | |
1004 | if (ret) | |
1005 | destroy_cm_id(&cm_id_priv->id); | |
1006 | } else | |
1007 | pr_debug("dropping event %d\n", levent.event); | |
1008 | if (iwcm_deref_id(cm_id_priv)) | |
922a8e9f | 1009 | return; |
e413a823 SW |
1010 | if (empty) |
1011 | return; | |
922a8e9f TT |
1012 | spin_lock_irqsave(&cm_id_priv->lock, flags); |
1013 | } | |
1014 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
1015 | } | |
1016 | ||
1017 | /* | |
1018 | * This function is called on interrupt context. Schedule events on | |
1019 | * the iwcm_wq thread to allow callback functions to downcall into | |
1020 | * the CM and/or block. Events are queued to a per-CM_ID | |
1021 | * work_list. If this is the first event on the work_list, the work | |
1022 | * element is also queued on the iwcm_wq thread. | |
1023 | * | |
1024 | * Each event holds a reference on the cm_id. Until the last posted | |
1025 | * event has been delivered and processed, the cm_id cannot be | |
1026 | * deleted. | |
1027 | * | |
1028 | * Returns: | |
1029 | * 0 - the event was handled. | |
1030 | * -ENOMEM - the event was not handled due to lack of resources. | |
1031 | */ | |
1032 | static int cm_event_handler(struct iw_cm_id *cm_id, | |
1033 | struct iw_cm_event *iw_event) | |
1034 | { | |
1035 | struct iwcm_work *work; | |
1036 | struct iwcm_id_private *cm_id_priv; | |
1037 | unsigned long flags; | |
1038 | int ret = 0; | |
1039 | ||
1040 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
1041 | ||
1042 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
1043 | work = get_work(cm_id_priv); | |
1044 | if (!work) { | |
1045 | ret = -ENOMEM; | |
1046 | goto out; | |
1047 | } | |
1048 | ||
c4028958 | 1049 | INIT_WORK(&work->work, cm_work_handler); |
922a8e9f TT |
1050 | work->cm_id = cm_id_priv; |
1051 | work->event = *iw_event; | |
1052 | ||
1053 | if ((work->event.event == IW_CM_EVENT_CONNECT_REQUEST || | |
1054 | work->event.event == IW_CM_EVENT_CONNECT_REPLY) && | |
1055 | work->event.private_data_len) { | |
715a588f | 1056 | ret = copy_private_data(&work->event); |
922a8e9f TT |
1057 | if (ret) { |
1058 | put_work(work); | |
1059 | goto out; | |
1060 | } | |
1061 | } | |
1062 | ||
1063 | atomic_inc(&cm_id_priv->refcount); | |
1064 | if (list_empty(&cm_id_priv->work_list)) { | |
1065 | list_add_tail(&work->list, &cm_id_priv->work_list); | |
1066 | queue_work(iwcm_wq, &work->work); | |
1067 | } else | |
1068 | list_add_tail(&work->list, &cm_id_priv->work_list); | |
1069 | out: | |
1070 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
1071 | return ret; | |
1072 | } | |
1073 | ||
1074 | static int iwcm_init_qp_init_attr(struct iwcm_id_private *cm_id_priv, | |
1075 | struct ib_qp_attr *qp_attr, | |
1076 | int *qp_attr_mask) | |
1077 | { | |
1078 | unsigned long flags; | |
1079 | int ret; | |
1080 | ||
1081 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
1082 | switch (cm_id_priv->state) { | |
1083 | case IW_CM_STATE_IDLE: | |
1084 | case IW_CM_STATE_CONN_SENT: | |
1085 | case IW_CM_STATE_CONN_RECV: | |
1086 | case IW_CM_STATE_ESTABLISHED: | |
1087 | *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS; | |
1ca8d156 | 1088 | qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE| |
922a8e9f TT |
1089 | IB_ACCESS_REMOTE_READ; |
1090 | ret = 0; | |
1091 | break; | |
1092 | default: | |
1093 | ret = -EINVAL; | |
1094 | break; | |
1095 | } | |
1096 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
1097 | return ret; | |
1098 | } | |
1099 | ||
1100 | static int iwcm_init_qp_rts_attr(struct iwcm_id_private *cm_id_priv, | |
1101 | struct ib_qp_attr *qp_attr, | |
1102 | int *qp_attr_mask) | |
1103 | { | |
1104 | unsigned long flags; | |
1105 | int ret; | |
1106 | ||
1107 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
1108 | switch (cm_id_priv->state) { | |
1109 | case IW_CM_STATE_IDLE: | |
1110 | case IW_CM_STATE_CONN_SENT: | |
1111 | case IW_CM_STATE_CONN_RECV: | |
1112 | case IW_CM_STATE_ESTABLISHED: | |
1113 | *qp_attr_mask = 0; | |
1114 | ret = 0; | |
1115 | break; | |
1116 | default: | |
1117 | ret = -EINVAL; | |
1118 | break; | |
1119 | } | |
1120 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
1121 | return ret; | |
1122 | } | |
1123 | ||
1124 | int iw_cm_init_qp_attr(struct iw_cm_id *cm_id, | |
1125 | struct ib_qp_attr *qp_attr, | |
1126 | int *qp_attr_mask) | |
1127 | { | |
1128 | struct iwcm_id_private *cm_id_priv; | |
1129 | int ret; | |
1130 | ||
1131 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
1132 | switch (qp_attr->qp_state) { | |
1133 | case IB_QPS_INIT: | |
1134 | case IB_QPS_RTR: | |
1135 | ret = iwcm_init_qp_init_attr(cm_id_priv, | |
1136 | qp_attr, qp_attr_mask); | |
1137 | break; | |
1138 | case IB_QPS_RTS: | |
1139 | ret = iwcm_init_qp_rts_attr(cm_id_priv, | |
1140 | qp_attr, qp_attr_mask); | |
1141 | break; | |
1142 | default: | |
1143 | ret = -EINVAL; | |
1144 | break; | |
1145 | } | |
1146 | return ret; | |
1147 | } | |
1148 | EXPORT_SYMBOL(iw_cm_init_qp_attr); | |
1149 | ||
1150 | static int __init iw_cm_init(void) | |
1151 | { | |
b493d91d FL |
1152 | int ret; |
1153 | ||
1154 | ret = iwpm_init(RDMA_NL_IWCM); | |
1155 | if (ret) | |
1156 | pr_err("iw_cm: couldn't init iwpm\n"); | |
1157 | ||
2fa2d4fb | 1158 | ret = ibnl_add_client(RDMA_NL_IWCM, ARRAY_SIZE(iwcm_nl_cb_table), |
b493d91d FL |
1159 | iwcm_nl_cb_table); |
1160 | if (ret) | |
1161 | pr_err("iw_cm: couldn't register netlink callbacks\n"); | |
1162 | ||
922a8e9f TT |
1163 | iwcm_wq = create_singlethread_workqueue("iw_cm_wq"); |
1164 | if (!iwcm_wq) | |
1165 | return -ENOMEM; | |
1166 | ||
2f0304d2 SW |
1167 | iwcm_ctl_table_hdr = register_net_sysctl(&init_net, "net/iw_cm", |
1168 | iwcm_ctl_table); | |
1169 | if (!iwcm_ctl_table_hdr) { | |
1170 | pr_err("iw_cm: couldn't register sysctl paths\n"); | |
1171 | destroy_workqueue(iwcm_wq); | |
1172 | return -ENOMEM; | |
1173 | } | |
1174 | ||
922a8e9f TT |
1175 | return 0; |
1176 | } | |
1177 | ||
1178 | static void __exit iw_cm_cleanup(void) | |
1179 | { | |
2f0304d2 | 1180 | unregister_net_sysctl_table(iwcm_ctl_table_hdr); |
922a8e9f | 1181 | destroy_workqueue(iwcm_wq); |
b493d91d FL |
1182 | ibnl_remove_client(RDMA_NL_IWCM); |
1183 | iwpm_exit(RDMA_NL_IWCM); | |
922a8e9f TT |
1184 | } |
1185 | ||
1186 | module_init(iw_cm_init); | |
1187 | module_exit(iw_cm_cleanup); |