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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 | ||
77a5db13 SW |
62 | static const char * const iwcm_rej_reason_strs[] = { |
63 | [ECONNRESET] = "reset by remote host", | |
64 | [ECONNREFUSED] = "refused by remote application", | |
65 | [ETIMEDOUT] = "setup timeout", | |
66 | }; | |
67 | ||
68 | const char *__attribute_const__ iwcm_reject_msg(int reason) | |
69 | { | |
70 | size_t index; | |
71 | ||
72 | /* iWARP uses negative errnos */ | |
73 | index = -reason; | |
74 | ||
75 | if (index < ARRAY_SIZE(iwcm_rej_reason_strs) && | |
76 | iwcm_rej_reason_strs[index]) | |
77 | return iwcm_rej_reason_strs[index]; | |
78 | else | |
79 | return "unrecognized reason"; | |
80 | } | |
81 | EXPORT_SYMBOL(iwcm_reject_msg); | |
82 | ||
d0e312fe | 83 | static struct rdma_nl_cbs iwcm_nl_cb_table[RDMA_NL_IWPM_NUM_OPS] = { |
b493d91d FL |
84 | [RDMA_NL_IWPM_REG_PID] = {.dump = iwpm_register_pid_cb}, |
85 | [RDMA_NL_IWPM_ADD_MAPPING] = {.dump = iwpm_add_mapping_cb}, | |
86 | [RDMA_NL_IWPM_QUERY_MAPPING] = {.dump = iwpm_add_and_query_mapping_cb}, | |
87 | [RDMA_NL_IWPM_REMOTE_INFO] = {.dump = iwpm_remote_info_cb}, | |
88 | [RDMA_NL_IWPM_HANDLE_ERR] = {.dump = iwpm_mapping_error_cb}, | |
89 | [RDMA_NL_IWPM_MAPINFO] = {.dump = iwpm_mapping_info_cb}, | |
90 | [RDMA_NL_IWPM_MAPINFO_NUM] = {.dump = iwpm_ack_mapping_info_cb} | |
91 | }; | |
92 | ||
922a8e9f TT |
93 | static struct workqueue_struct *iwcm_wq; |
94 | struct iwcm_work { | |
95 | struct work_struct work; | |
96 | struct iwcm_id_private *cm_id; | |
97 | struct list_head list; | |
98 | struct iw_cm_event event; | |
99 | struct list_head free_list; | |
100 | }; | |
101 | ||
2f0304d2 SW |
102 | static unsigned int default_backlog = 256; |
103 | ||
104 | static struct ctl_table_header *iwcm_ctl_table_hdr; | |
105 | static struct ctl_table iwcm_ctl_table[] = { | |
106 | { | |
107 | .procname = "default_backlog", | |
108 | .data = &default_backlog, | |
109 | .maxlen = sizeof(default_backlog), | |
110 | .mode = 0644, | |
111 | .proc_handler = proc_dointvec, | |
112 | }, | |
113 | { } | |
114 | }; | |
115 | ||
922a8e9f TT |
116 | /* |
117 | * The following services provide a mechanism for pre-allocating iwcm_work | |
118 | * elements. The design pre-allocates them based on the cm_id type: | |
119 | * LISTENING IDS: Get enough elements preallocated to handle the | |
120 | * listen backlog. | |
121 | * ACTIVE IDS: 4: CONNECT_REPLY, ESTABLISHED, DISCONNECT, CLOSE | |
122 | * PASSIVE IDS: 3: ESTABLISHED, DISCONNECT, CLOSE | |
123 | * | |
124 | * Allocating them in connect and listen avoids having to deal | |
125 | * with allocation failures on the event upcall from the provider (which | |
126 | * is called in the interrupt context). | |
127 | * | |
128 | * One exception is when creating the cm_id for incoming connection requests. | |
129 | * There are two cases: | |
130 | * 1) in the event upcall, cm_event_handler(), for a listening cm_id. If | |
131 | * the backlog is exceeded, then no more connection request events will | |
132 | * be processed. cm_event_handler() returns -ENOMEM in this case. Its up | |
715a588f | 133 | * to the provider to reject the connection request. |
922a8e9f TT |
134 | * 2) in the connection request workqueue handler, cm_conn_req_handler(). |
135 | * If work elements cannot be allocated for the new connect request cm_id, | |
136 | * then IWCM will call the provider reject method. This is ok since | |
137 | * cm_conn_req_handler() runs in the workqueue thread context. | |
138 | */ | |
139 | ||
140 | static struct iwcm_work *get_work(struct iwcm_id_private *cm_id_priv) | |
141 | { | |
142 | struct iwcm_work *work; | |
143 | ||
144 | if (list_empty(&cm_id_priv->work_free_list)) | |
145 | return NULL; | |
146 | work = list_entry(cm_id_priv->work_free_list.next, struct iwcm_work, | |
147 | free_list); | |
148 | list_del_init(&work->free_list); | |
149 | return work; | |
150 | } | |
151 | ||
152 | static void put_work(struct iwcm_work *work) | |
153 | { | |
154 | list_add(&work->free_list, &work->cm_id->work_free_list); | |
155 | } | |
156 | ||
157 | static void dealloc_work_entries(struct iwcm_id_private *cm_id_priv) | |
158 | { | |
159 | struct list_head *e, *tmp; | |
160 | ||
161 | list_for_each_safe(e, tmp, &cm_id_priv->work_free_list) | |
162 | kfree(list_entry(e, struct iwcm_work, free_list)); | |
163 | } | |
164 | ||
165 | static int alloc_work_entries(struct iwcm_id_private *cm_id_priv, int count) | |
166 | { | |
167 | struct iwcm_work *work; | |
168 | ||
169 | BUG_ON(!list_empty(&cm_id_priv->work_free_list)); | |
170 | while (count--) { | |
171 | work = kmalloc(sizeof(struct iwcm_work), GFP_KERNEL); | |
172 | if (!work) { | |
173 | dealloc_work_entries(cm_id_priv); | |
174 | return -ENOMEM; | |
175 | } | |
176 | work->cm_id = cm_id_priv; | |
177 | INIT_LIST_HEAD(&work->list); | |
178 | put_work(work); | |
179 | } | |
180 | return 0; | |
181 | } | |
182 | ||
183 | /* | |
715a588f KK |
184 | * Save private data from incoming connection requests to |
185 | * iw_cm_event, so the low level driver doesn't have to. Adjust | |
922a8e9f TT |
186 | * the event ptr to point to the local copy. |
187 | */ | |
715a588f | 188 | static int copy_private_data(struct iw_cm_event *event) |
922a8e9f TT |
189 | { |
190 | void *p; | |
191 | ||
bed8bdfd | 192 | p = kmemdup(event->private_data, event->private_data_len, GFP_ATOMIC); |
922a8e9f TT |
193 | if (!p) |
194 | return -ENOMEM; | |
922a8e9f TT |
195 | event->private_data = p; |
196 | return 0; | |
197 | } | |
198 | ||
ebb90986 SW |
199 | static void free_cm_id(struct iwcm_id_private *cm_id_priv) |
200 | { | |
201 | dealloc_work_entries(cm_id_priv); | |
202 | kfree(cm_id_priv); | |
203 | } | |
204 | ||
922a8e9f | 205 | /* |
9ab1ffa8 | 206 | * Release a reference on cm_id. If the last reference is being |
59c68ac3 | 207 | * released, free the cm_id and return 1. |
922a8e9f TT |
208 | */ |
209 | static int iwcm_deref_id(struct iwcm_id_private *cm_id_priv) | |
210 | { | |
922a8e9f TT |
211 | BUG_ON(atomic_read(&cm_id_priv->refcount)==0); |
212 | if (atomic_dec_and_test(&cm_id_priv->refcount)) { | |
213 | BUG_ON(!list_empty(&cm_id_priv->work_list)); | |
59c68ac3 | 214 | free_cm_id(cm_id_priv); |
ebb90986 | 215 | return 1; |
922a8e9f TT |
216 | } |
217 | ||
ebb90986 | 218 | return 0; |
922a8e9f TT |
219 | } |
220 | ||
221 | static void add_ref(struct iw_cm_id *cm_id) | |
222 | { | |
223 | struct iwcm_id_private *cm_id_priv; | |
224 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
225 | atomic_inc(&cm_id_priv->refcount); | |
226 | } | |
227 | ||
228 | static void rem_ref(struct iw_cm_id *cm_id) | |
229 | { | |
230 | struct iwcm_id_private *cm_id_priv; | |
6b59ba60 | 231 | |
922a8e9f | 232 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); |
6b59ba60 | 233 | |
59c68ac3 | 234 | (void)iwcm_deref_id(cm_id_priv); |
922a8e9f TT |
235 | } |
236 | ||
237 | static int cm_event_handler(struct iw_cm_id *cm_id, struct iw_cm_event *event); | |
238 | ||
239 | struct iw_cm_id *iw_create_cm_id(struct ib_device *device, | |
240 | iw_cm_handler cm_handler, | |
241 | void *context) | |
242 | { | |
243 | struct iwcm_id_private *cm_id_priv; | |
244 | ||
245 | cm_id_priv = kzalloc(sizeof(*cm_id_priv), GFP_KERNEL); | |
246 | if (!cm_id_priv) | |
247 | return ERR_PTR(-ENOMEM); | |
248 | ||
249 | cm_id_priv->state = IW_CM_STATE_IDLE; | |
250 | cm_id_priv->id.device = device; | |
251 | cm_id_priv->id.cm_handler = cm_handler; | |
252 | cm_id_priv->id.context = context; | |
253 | cm_id_priv->id.event_handler = cm_event_handler; | |
254 | cm_id_priv->id.add_ref = add_ref; | |
255 | cm_id_priv->id.rem_ref = rem_ref; | |
256 | spin_lock_init(&cm_id_priv->lock); | |
257 | atomic_set(&cm_id_priv->refcount, 1); | |
258 | init_waitqueue_head(&cm_id_priv->connect_wait); | |
259 | init_completion(&cm_id_priv->destroy_comp); | |
260 | INIT_LIST_HEAD(&cm_id_priv->work_list); | |
261 | INIT_LIST_HEAD(&cm_id_priv->work_free_list); | |
262 | ||
263 | return &cm_id_priv->id; | |
264 | } | |
265 | EXPORT_SYMBOL(iw_create_cm_id); | |
266 | ||
267 | ||
268 | static int iwcm_modify_qp_err(struct ib_qp *qp) | |
269 | { | |
270 | struct ib_qp_attr qp_attr; | |
271 | ||
272 | if (!qp) | |
273 | return -EINVAL; | |
274 | ||
275 | qp_attr.qp_state = IB_QPS_ERR; | |
276 | return ib_modify_qp(qp, &qp_attr, IB_QP_STATE); | |
277 | } | |
278 | ||
279 | /* | |
280 | * This is really the RDMAC CLOSING state. It is most similar to the | |
281 | * IB SQD QP state. | |
282 | */ | |
283 | static int iwcm_modify_qp_sqd(struct ib_qp *qp) | |
284 | { | |
285 | struct ib_qp_attr qp_attr; | |
286 | ||
287 | BUG_ON(qp == NULL); | |
288 | qp_attr.qp_state = IB_QPS_SQD; | |
289 | return ib_modify_qp(qp, &qp_attr, IB_QP_STATE); | |
290 | } | |
291 | ||
292 | /* | |
293 | * CM_ID <-- CLOSING | |
294 | * | |
715a588f | 295 | * Block if a passive or active connection is currently being processed. Then |
922a8e9f TT |
296 | * process the event as follows: |
297 | * - If we are ESTABLISHED, move to CLOSING and modify the QP state | |
298 | * based on the abrupt flag | |
299 | * - If the connection is already in the CLOSING or IDLE state, the peer is | |
300 | * disconnecting concurrently with us and we've already seen the | |
301 | * DISCONNECT event -- ignore the request and return 0 | |
302 | * - Disconnect on a listening endpoint returns -EINVAL | |
303 | */ | |
304 | int iw_cm_disconnect(struct iw_cm_id *cm_id, int abrupt) | |
305 | { | |
306 | struct iwcm_id_private *cm_id_priv; | |
307 | unsigned long flags; | |
308 | int ret = 0; | |
309 | struct ib_qp *qp = NULL; | |
310 | ||
311 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
312 | /* Wait if we're currently in a connect or accept downcall */ | |
313 | wait_event(cm_id_priv->connect_wait, | |
314 | !test_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags)); | |
315 | ||
316 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
317 | switch (cm_id_priv->state) { | |
318 | case IW_CM_STATE_ESTABLISHED: | |
319 | cm_id_priv->state = IW_CM_STATE_CLOSING; | |
320 | ||
321 | /* QP could be <nul> for user-mode client */ | |
322 | if (cm_id_priv->qp) | |
323 | qp = cm_id_priv->qp; | |
324 | else | |
325 | ret = -EINVAL; | |
326 | break; | |
327 | case IW_CM_STATE_LISTEN: | |
328 | ret = -EINVAL; | |
329 | break; | |
330 | case IW_CM_STATE_CLOSING: | |
331 | /* remote peer closed first */ | |
332 | case IW_CM_STATE_IDLE: | |
333 | /* accept or connect returned !0 */ | |
334 | break; | |
335 | case IW_CM_STATE_CONN_RECV: | |
336 | /* | |
337 | * App called disconnect before/without calling accept after | |
338 | * connect_request event delivered. | |
339 | */ | |
340 | break; | |
341 | case IW_CM_STATE_CONN_SENT: | |
342 | /* Can only get here if wait above fails */ | |
343 | default: | |
344 | BUG(); | |
345 | } | |
346 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
347 | ||
348 | if (qp) { | |
349 | if (abrupt) | |
350 | ret = iwcm_modify_qp_err(qp); | |
351 | else | |
352 | ret = iwcm_modify_qp_sqd(qp); | |
353 | ||
354 | /* | |
355 | * If both sides are disconnecting the QP could | |
356 | * already be in ERR or SQD states | |
357 | */ | |
358 | ret = 0; | |
359 | } | |
360 | ||
361 | return ret; | |
362 | } | |
363 | EXPORT_SYMBOL(iw_cm_disconnect); | |
364 | ||
365 | /* | |
366 | * CM_ID <-- DESTROYING | |
367 | * | |
368 | * Clean up all resources associated with the connection and release | |
369 | * the initial reference taken by iw_create_cm_id. | |
370 | */ | |
371 | static void destroy_cm_id(struct iw_cm_id *cm_id) | |
372 | { | |
373 | struct iwcm_id_private *cm_id_priv; | |
374 | unsigned long flags; | |
922a8e9f TT |
375 | |
376 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
377 | /* | |
378 | * Wait if we're currently in a connect or accept downcall. A | |
379 | * listening endpoint should never block here. | |
380 | */ | |
381 | wait_event(cm_id_priv->connect_wait, | |
382 | !test_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags)); | |
383 | ||
59c68ac3 SW |
384 | /* |
385 | * Since we're deleting the cm_id, drop any events that | |
386 | * might arrive before the last dereference. | |
387 | */ | |
388 | set_bit(IWCM_F_DROP_EVENTS, &cm_id_priv->flags); | |
389 | ||
922a8e9f TT |
390 | spin_lock_irqsave(&cm_id_priv->lock, flags); |
391 | switch (cm_id_priv->state) { | |
392 | case IW_CM_STATE_LISTEN: | |
393 | cm_id_priv->state = IW_CM_STATE_DESTROYING; | |
394 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
395 | /* destroy the listening endpoint */ | |
05633102 | 396 | cm_id->device->iwcm->destroy_listen(cm_id); |
922a8e9f TT |
397 | spin_lock_irqsave(&cm_id_priv->lock, flags); |
398 | break; | |
399 | case IW_CM_STATE_ESTABLISHED: | |
400 | cm_id_priv->state = IW_CM_STATE_DESTROYING; | |
401 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
402 | /* Abrupt close of the connection */ | |
403 | (void)iwcm_modify_qp_err(cm_id_priv->qp); | |
404 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
405 | break; | |
406 | case IW_CM_STATE_IDLE: | |
407 | case IW_CM_STATE_CLOSING: | |
408 | cm_id_priv->state = IW_CM_STATE_DESTROYING; | |
409 | break; | |
410 | case IW_CM_STATE_CONN_RECV: | |
411 | /* | |
412 | * App called destroy before/without calling accept after | |
ebb90986 SW |
413 | * receiving connection request event notification or |
414 | * returned non zero from the event callback function. | |
415 | * In either case, must tell the provider to reject. | |
922a8e9f TT |
416 | */ |
417 | cm_id_priv->state = IW_CM_STATE_DESTROYING; | |
54e05f15 | 418 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); |
cb58160e | 419 | cm_id->device->iwcm->reject(cm_id, NULL, 0); |
54e05f15 | 420 | spin_lock_irqsave(&cm_id_priv->lock, flags); |
922a8e9f TT |
421 | break; |
422 | case IW_CM_STATE_CONN_SENT: | |
423 | case IW_CM_STATE_DESTROYING: | |
424 | default: | |
425 | BUG(); | |
426 | break; | |
427 | } | |
428 | if (cm_id_priv->qp) { | |
429 | cm_id_priv->id.device->iwcm->rem_ref(cm_id_priv->qp); | |
430 | cm_id_priv->qp = NULL; | |
431 | } | |
432 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
433 | ||
b493d91d FL |
434 | if (cm_id->mapped) { |
435 | iwpm_remove_mapinfo(&cm_id->local_addr, &cm_id->m_local_addr); | |
436 | iwpm_remove_mapping(&cm_id->local_addr, RDMA_NL_IWCM); | |
437 | } | |
438 | ||
922a8e9f TT |
439 | (void)iwcm_deref_id(cm_id_priv); |
440 | } | |
441 | ||
442 | /* | |
443 | * This function is only called by the application thread and cannot | |
444 | * be called by the event thread. The function will wait for all | |
445 | * references to be released on the cm_id and then kfree the cm_id | |
446 | * object. | |
447 | */ | |
448 | void iw_destroy_cm_id(struct iw_cm_id *cm_id) | |
449 | { | |
922a8e9f | 450 | destroy_cm_id(cm_id); |
922a8e9f TT |
451 | } |
452 | EXPORT_SYMBOL(iw_destroy_cm_id); | |
453 | ||
b493d91d FL |
454 | /** |
455 | * iw_cm_check_wildcard - If IP address is 0 then use original | |
456 | * @pm_addr: sockaddr containing the ip to check for wildcard | |
457 | * @cm_addr: sockaddr containing the actual IP address | |
458 | * @cm_outaddr: sockaddr to set IP addr which leaving port | |
459 | * | |
460 | * Checks the pm_addr for wildcard and then sets cm_outaddr's | |
461 | * IP to the actual (cm_addr). | |
462 | */ | |
463 | static void iw_cm_check_wildcard(struct sockaddr_storage *pm_addr, | |
464 | struct sockaddr_storage *cm_addr, | |
465 | struct sockaddr_storage *cm_outaddr) | |
466 | { | |
467 | if (pm_addr->ss_family == AF_INET) { | |
468 | struct sockaddr_in *pm4_addr = (struct sockaddr_in *)pm_addr; | |
469 | ||
825107a2 | 470 | if (pm4_addr->sin_addr.s_addr == htonl(INADDR_ANY)) { |
b493d91d FL |
471 | struct sockaddr_in *cm4_addr = |
472 | (struct sockaddr_in *)cm_addr; | |
473 | struct sockaddr_in *cm4_outaddr = | |
474 | (struct sockaddr_in *)cm_outaddr; | |
475 | ||
476 | cm4_outaddr->sin_addr = cm4_addr->sin_addr; | |
477 | } | |
478 | } else { | |
479 | struct sockaddr_in6 *pm6_addr = (struct sockaddr_in6 *)pm_addr; | |
480 | ||
481 | if (ipv6_addr_type(&pm6_addr->sin6_addr) == IPV6_ADDR_ANY) { | |
482 | struct sockaddr_in6 *cm6_addr = | |
483 | (struct sockaddr_in6 *)cm_addr; | |
484 | struct sockaddr_in6 *cm6_outaddr = | |
485 | (struct sockaddr_in6 *)cm_outaddr; | |
486 | ||
487 | cm6_outaddr->sin6_addr = cm6_addr->sin6_addr; | |
488 | } | |
489 | } | |
490 | } | |
491 | ||
492 | /** | |
493 | * iw_cm_map - Use portmapper to map the ports | |
494 | * @cm_id: connection manager pointer | |
495 | * @active: Indicates the active side when true | |
496 | * returns nonzero for error only if iwpm_create_mapinfo() fails | |
497 | * | |
498 | * Tries to add a mapping for a port using the Portmapper. If | |
499 | * successful in mapping the IP/Port it will check the remote | |
500 | * mapped IP address for a wildcard IP address and replace the | |
501 | * zero IP address with the remote_addr. | |
502 | */ | |
503 | static int iw_cm_map(struct iw_cm_id *cm_id, bool active) | |
504 | { | |
505 | struct iwpm_dev_data pm_reg_msg; | |
506 | struct iwpm_sa_data pm_msg; | |
507 | int status; | |
508 | ||
509 | cm_id->m_local_addr = cm_id->local_addr; | |
510 | cm_id->m_remote_addr = cm_id->remote_addr; | |
511 | ||
512 | memcpy(pm_reg_msg.dev_name, cm_id->device->name, | |
513 | sizeof(pm_reg_msg.dev_name)); | |
514 | memcpy(pm_reg_msg.if_name, cm_id->device->iwcm->ifname, | |
515 | sizeof(pm_reg_msg.if_name)); | |
516 | ||
517 | if (iwpm_register_pid(&pm_reg_msg, RDMA_NL_IWCM) || | |
518 | !iwpm_valid_pid()) | |
519 | return 0; | |
520 | ||
521 | cm_id->mapped = true; | |
522 | pm_msg.loc_addr = cm_id->local_addr; | |
523 | pm_msg.rem_addr = cm_id->remote_addr; | |
524 | if (active) | |
525 | status = iwpm_add_and_query_mapping(&pm_msg, | |
526 | RDMA_NL_IWCM); | |
527 | else | |
528 | status = iwpm_add_mapping(&pm_msg, RDMA_NL_IWCM); | |
529 | ||
530 | if (!status) { | |
531 | cm_id->m_local_addr = pm_msg.mapped_loc_addr; | |
532 | if (active) { | |
533 | cm_id->m_remote_addr = pm_msg.mapped_rem_addr; | |
534 | iw_cm_check_wildcard(&pm_msg.mapped_rem_addr, | |
535 | &cm_id->remote_addr, | |
536 | &cm_id->m_remote_addr); | |
537 | } | |
538 | } | |
539 | ||
540 | return iwpm_create_mapinfo(&cm_id->local_addr, | |
541 | &cm_id->m_local_addr, | |
542 | RDMA_NL_IWCM); | |
543 | } | |
544 | ||
922a8e9f TT |
545 | /* |
546 | * CM_ID <-- LISTEN | |
547 | * | |
548 | * Start listening for connect requests. Generates one CONNECT_REQUEST | |
549 | * event for each inbound connect request. | |
550 | */ | |
551 | int iw_cm_listen(struct iw_cm_id *cm_id, int backlog) | |
552 | { | |
553 | struct iwcm_id_private *cm_id_priv; | |
554 | unsigned long flags; | |
13fccdb3 | 555 | int ret; |
922a8e9f TT |
556 | |
557 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
558 | ||
2f0304d2 SW |
559 | if (!backlog) |
560 | backlog = default_backlog; | |
561 | ||
922a8e9f TT |
562 | ret = alloc_work_entries(cm_id_priv, backlog); |
563 | if (ret) | |
564 | return ret; | |
565 | ||
566 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
567 | switch (cm_id_priv->state) { | |
568 | case IW_CM_STATE_IDLE: | |
569 | cm_id_priv->state = IW_CM_STATE_LISTEN; | |
570 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
b493d91d FL |
571 | ret = iw_cm_map(cm_id, false); |
572 | if (!ret) | |
573 | ret = cm_id->device->iwcm->create_listen(cm_id, backlog); | |
922a8e9f TT |
574 | if (ret) |
575 | cm_id_priv->state = IW_CM_STATE_IDLE; | |
576 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
577 | break; | |
578 | default: | |
579 | ret = -EINVAL; | |
580 | } | |
581 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
582 | ||
583 | return ret; | |
584 | } | |
585 | EXPORT_SYMBOL(iw_cm_listen); | |
586 | ||
587 | /* | |
588 | * CM_ID <-- IDLE | |
589 | * | |
590 | * Rejects an inbound connection request. No events are generated. | |
591 | */ | |
592 | int iw_cm_reject(struct iw_cm_id *cm_id, | |
593 | const void *private_data, | |
594 | u8 private_data_len) | |
595 | { | |
596 | struct iwcm_id_private *cm_id_priv; | |
597 | unsigned long flags; | |
598 | int ret; | |
599 | ||
600 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
601 | set_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); | |
602 | ||
603 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
604 | if (cm_id_priv->state != IW_CM_STATE_CONN_RECV) { | |
605 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
606 | clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); | |
607 | wake_up_all(&cm_id_priv->connect_wait); | |
608 | return -EINVAL; | |
609 | } | |
610 | cm_id_priv->state = IW_CM_STATE_IDLE; | |
611 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
612 | ||
613 | ret = cm_id->device->iwcm->reject(cm_id, private_data, | |
614 | private_data_len); | |
615 | ||
616 | clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); | |
617 | wake_up_all(&cm_id_priv->connect_wait); | |
618 | ||
619 | return ret; | |
620 | } | |
621 | EXPORT_SYMBOL(iw_cm_reject); | |
622 | ||
623 | /* | |
624 | * CM_ID <-- ESTABLISHED | |
625 | * | |
626 | * Accepts an inbound connection request and generates an ESTABLISHED | |
627 | * event. Callers of iw_cm_disconnect and iw_destroy_cm_id will block | |
628 | * until the ESTABLISHED event is received from the provider. | |
629 | */ | |
630 | int iw_cm_accept(struct iw_cm_id *cm_id, | |
631 | struct iw_cm_conn_param *iw_param) | |
632 | { | |
633 | struct iwcm_id_private *cm_id_priv; | |
634 | struct ib_qp *qp; | |
635 | unsigned long flags; | |
636 | int ret; | |
637 | ||
638 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
639 | set_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); | |
640 | ||
641 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
642 | if (cm_id_priv->state != IW_CM_STATE_CONN_RECV) { | |
643 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
644 | clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); | |
645 | wake_up_all(&cm_id_priv->connect_wait); | |
646 | return -EINVAL; | |
647 | } | |
648 | /* Get the ib_qp given the QPN */ | |
649 | qp = cm_id->device->iwcm->get_qp(cm_id->device, iw_param->qpn); | |
650 | if (!qp) { | |
651 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
26012f07 AT |
652 | clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); |
653 | wake_up_all(&cm_id_priv->connect_wait); | |
922a8e9f TT |
654 | return -EINVAL; |
655 | } | |
656 | cm_id->device->iwcm->add_ref(qp); | |
657 | cm_id_priv->qp = qp; | |
658 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
659 | ||
660 | ret = cm_id->device->iwcm->accept(cm_id, iw_param); | |
661 | if (ret) { | |
662 | /* An error on accept precludes provider events */ | |
663 | BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_RECV); | |
664 | cm_id_priv->state = IW_CM_STATE_IDLE; | |
665 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
666 | if (cm_id_priv->qp) { | |
667 | cm_id->device->iwcm->rem_ref(qp); | |
668 | cm_id_priv->qp = NULL; | |
669 | } | |
670 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
671 | clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); | |
672 | wake_up_all(&cm_id_priv->connect_wait); | |
673 | } | |
674 | ||
675 | return ret; | |
676 | } | |
677 | EXPORT_SYMBOL(iw_cm_accept); | |
678 | ||
679 | /* | |
680 | * Active Side: CM_ID <-- CONN_SENT | |
681 | * | |
682 | * If successful, results in the generation of a CONNECT_REPLY | |
683 | * event. iw_cm_disconnect and iw_cm_destroy will block until the | |
684 | * CONNECT_REPLY event is received from the provider. | |
685 | */ | |
686 | int iw_cm_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *iw_param) | |
687 | { | |
688 | struct iwcm_id_private *cm_id_priv; | |
13fccdb3 | 689 | int ret; |
922a8e9f TT |
690 | unsigned long flags; |
691 | struct ib_qp *qp; | |
692 | ||
693 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
694 | ||
695 | ret = alloc_work_entries(cm_id_priv, 4); | |
696 | if (ret) | |
697 | return ret; | |
698 | ||
699 | set_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); | |
700 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
701 | ||
702 | if (cm_id_priv->state != IW_CM_STATE_IDLE) { | |
b493d91d FL |
703 | ret = -EINVAL; |
704 | goto err; | |
922a8e9f TT |
705 | } |
706 | ||
707 | /* Get the ib_qp given the QPN */ | |
708 | qp = cm_id->device->iwcm->get_qp(cm_id->device, iw_param->qpn); | |
709 | if (!qp) { | |
b493d91d FL |
710 | ret = -EINVAL; |
711 | goto err; | |
922a8e9f TT |
712 | } |
713 | cm_id->device->iwcm->add_ref(qp); | |
714 | cm_id_priv->qp = qp; | |
715 | cm_id_priv->state = IW_CM_STATE_CONN_SENT; | |
716 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
717 | ||
b493d91d FL |
718 | ret = iw_cm_map(cm_id, true); |
719 | if (!ret) | |
720 | ret = cm_id->device->iwcm->connect(cm_id, iw_param); | |
721 | if (!ret) | |
722 | return 0; /* success */ | |
922a8e9f | 723 | |
b493d91d FL |
724 | spin_lock_irqsave(&cm_id_priv->lock, flags); |
725 | if (cm_id_priv->qp) { | |
726 | cm_id->device->iwcm->rem_ref(qp); | |
727 | cm_id_priv->qp = NULL; | |
728 | } | |
729 | cm_id_priv->state = IW_CM_STATE_IDLE; | |
730 | err: | |
731 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
732 | clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); | |
733 | wake_up_all(&cm_id_priv->connect_wait); | |
922a8e9f TT |
734 | return ret; |
735 | } | |
736 | EXPORT_SYMBOL(iw_cm_connect); | |
737 | ||
738 | /* | |
739 | * Passive Side: new CM_ID <-- CONN_RECV | |
740 | * | |
741 | * Handles an inbound connect request. The function creates a new | |
742 | * iw_cm_id to represent the new connection and inherits the client | |
743 | * callback function and other attributes from the listening parent. | |
744 | * | |
745 | * The work item contains a pointer to the listen_cm_id and the event. The | |
746 | * listen_cm_id contains the client cm_handler, context and | |
747 | * device. These are copied when the device is cloned. The event | |
748 | * contains the new four tuple. | |
749 | * | |
750 | * An error on the child should not affect the parent, so this | |
751 | * function does not return a value. | |
752 | */ | |
753 | static void cm_conn_req_handler(struct iwcm_id_private *listen_id_priv, | |
754 | struct iw_cm_event *iw_event) | |
755 | { | |
756 | unsigned long flags; | |
757 | struct iw_cm_id *cm_id; | |
758 | struct iwcm_id_private *cm_id_priv; | |
759 | int ret; | |
760 | ||
761 | /* | |
762 | * The provider should never generate a connection request | |
763 | * event with a bad status. | |
764 | */ | |
765 | BUG_ON(iw_event->status); | |
766 | ||
922a8e9f TT |
767 | cm_id = iw_create_cm_id(listen_id_priv->id.device, |
768 | listen_id_priv->id.cm_handler, | |
769 | listen_id_priv->id.context); | |
770 | /* If the cm_id could not be created, ignore the request */ | |
771 | if (IS_ERR(cm_id)) | |
83b96586 | 772 | goto out; |
922a8e9f TT |
773 | |
774 | cm_id->provider_data = iw_event->provider_data; | |
b493d91d FL |
775 | cm_id->m_local_addr = iw_event->local_addr; |
776 | cm_id->m_remote_addr = iw_event->remote_addr; | |
777 | cm_id->local_addr = listen_id_priv->id.local_addr; | |
778 | ||
779 | ret = iwpm_get_remote_info(&listen_id_priv->id.m_local_addr, | |
780 | &iw_event->remote_addr, | |
781 | &cm_id->remote_addr, | |
782 | RDMA_NL_IWCM); | |
783 | if (ret) { | |
784 | cm_id->remote_addr = iw_event->remote_addr; | |
785 | } else { | |
786 | iw_cm_check_wildcard(&listen_id_priv->id.m_local_addr, | |
787 | &iw_event->local_addr, | |
788 | &cm_id->local_addr); | |
789 | iw_event->local_addr = cm_id->local_addr; | |
790 | iw_event->remote_addr = cm_id->remote_addr; | |
791 | } | |
922a8e9f TT |
792 | |
793 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
794 | cm_id_priv->state = IW_CM_STATE_CONN_RECV; | |
795 | ||
3eae7c9f SW |
796 | /* |
797 | * We could be destroying the listening id. If so, ignore this | |
798 | * upcall. | |
799 | */ | |
800 | spin_lock_irqsave(&listen_id_priv->lock, flags); | |
801 | if (listen_id_priv->state != IW_CM_STATE_LISTEN) { | |
802 | spin_unlock_irqrestore(&listen_id_priv->lock, flags); | |
803 | iw_cm_reject(cm_id, NULL, 0); | |
804 | iw_destroy_cm_id(cm_id); | |
805 | goto out; | |
806 | } | |
807 | spin_unlock_irqrestore(&listen_id_priv->lock, flags); | |
808 | ||
922a8e9f TT |
809 | ret = alloc_work_entries(cm_id_priv, 3); |
810 | if (ret) { | |
811 | iw_cm_reject(cm_id, NULL, 0); | |
812 | iw_destroy_cm_id(cm_id); | |
83b96586 | 813 | goto out; |
922a8e9f TT |
814 | } |
815 | ||
816 | /* Call the client CM handler */ | |
817 | ret = cm_id->cm_handler(cm_id, iw_event); | |
818 | if (ret) { | |
ebb90986 | 819 | iw_cm_reject(cm_id, NULL, 0); |
59c68ac3 | 820 | iw_destroy_cm_id(cm_id); |
922a8e9f TT |
821 | } |
822 | ||
83b96586 | 823 | out: |
922a8e9f TT |
824 | if (iw_event->private_data_len) |
825 | kfree(iw_event->private_data); | |
826 | } | |
827 | ||
828 | /* | |
829 | * Passive Side: CM_ID <-- ESTABLISHED | |
830 | * | |
831 | * The provider generated an ESTABLISHED event which means that | |
832 | * the MPA negotion has completed successfully and we are now in MPA | |
833 | * FPDU mode. | |
834 | * | |
835 | * This event can only be received in the CONN_RECV state. If the | |
836 | * remote peer closed, the ESTABLISHED event would be received followed | |
837 | * by the CLOSE event. If the app closes, it will block until we wake | |
838 | * it up after processing this event. | |
839 | */ | |
840 | static int cm_conn_est_handler(struct iwcm_id_private *cm_id_priv, | |
841 | struct iw_cm_event *iw_event) | |
842 | { | |
843 | unsigned long flags; | |
13fccdb3 | 844 | int ret; |
922a8e9f TT |
845 | |
846 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
847 | ||
848 | /* | |
849 | * We clear the CONNECT_WAIT bit here to allow the callback | |
850 | * function to call iw_cm_disconnect. Calling iw_destroy_cm_id | |
851 | * from a callback handler is not allowed. | |
852 | */ | |
853 | clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); | |
854 | BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_RECV); | |
855 | cm_id_priv->state = IW_CM_STATE_ESTABLISHED; | |
856 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
857 | ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event); | |
858 | wake_up_all(&cm_id_priv->connect_wait); | |
859 | ||
860 | return ret; | |
861 | } | |
862 | ||
863 | /* | |
864 | * Active Side: CM_ID <-- ESTABLISHED | |
865 | * | |
866 | * The app has called connect and is waiting for the established event to | |
867 | * post it's requests to the server. This event will wake up anyone | |
868 | * blocked in iw_cm_disconnect or iw_destroy_id. | |
869 | */ | |
870 | static int cm_conn_rep_handler(struct iwcm_id_private *cm_id_priv, | |
871 | struct iw_cm_event *iw_event) | |
872 | { | |
873 | unsigned long flags; | |
13fccdb3 | 874 | int ret; |
922a8e9f TT |
875 | |
876 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
877 | /* | |
878 | * Clear the connect wait bit so a callback function calling | |
879 | * iw_cm_disconnect will not wait and deadlock this thread | |
880 | */ | |
881 | clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags); | |
882 | BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_SENT); | |
d0c49bf3 | 883 | if (iw_event->status == 0) { |
b493d91d FL |
884 | cm_id_priv->id.m_local_addr = iw_event->local_addr; |
885 | cm_id_priv->id.m_remote_addr = iw_event->remote_addr; | |
886 | iw_event->local_addr = cm_id_priv->id.local_addr; | |
887 | iw_event->remote_addr = cm_id_priv->id.remote_addr; | |
922a8e9f TT |
888 | cm_id_priv->state = IW_CM_STATE_ESTABLISHED; |
889 | } else { | |
890 | /* REJECTED or RESET */ | |
891 | cm_id_priv->id.device->iwcm->rem_ref(cm_id_priv->qp); | |
892 | cm_id_priv->qp = NULL; | |
893 | cm_id_priv->state = IW_CM_STATE_IDLE; | |
894 | } | |
895 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
896 | ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event); | |
897 | ||
898 | if (iw_event->private_data_len) | |
899 | kfree(iw_event->private_data); | |
900 | ||
901 | /* Wake up waiters on connect complete */ | |
902 | wake_up_all(&cm_id_priv->connect_wait); | |
903 | ||
904 | return ret; | |
905 | } | |
906 | ||
907 | /* | |
908 | * CM_ID <-- CLOSING | |
909 | * | |
910 | * If in the ESTABLISHED state, move to CLOSING. | |
911 | */ | |
912 | static void cm_disconnect_handler(struct iwcm_id_private *cm_id_priv, | |
913 | struct iw_cm_event *iw_event) | |
914 | { | |
915 | unsigned long flags; | |
916 | ||
917 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
918 | if (cm_id_priv->state == IW_CM_STATE_ESTABLISHED) | |
919 | cm_id_priv->state = IW_CM_STATE_CLOSING; | |
920 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
921 | } | |
922 | ||
923 | /* | |
924 | * CM_ID <-- IDLE | |
925 | * | |
926 | * If in the ESTBLISHED or CLOSING states, the QP will have have been | |
927 | * moved by the provider to the ERR state. Disassociate the CM_ID from | |
928 | * the QP, move to IDLE, and remove the 'connected' reference. | |
929 | * | |
930 | * If in some other state, the cm_id was destroyed asynchronously. | |
931 | * This is the last reference that will result in waking up | |
932 | * the app thread blocked in iw_destroy_cm_id. | |
933 | */ | |
934 | static int cm_close_handler(struct iwcm_id_private *cm_id_priv, | |
935 | struct iw_cm_event *iw_event) | |
936 | { | |
937 | unsigned long flags; | |
938 | int ret = 0; | |
939 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
940 | ||
941 | if (cm_id_priv->qp) { | |
942 | cm_id_priv->id.device->iwcm->rem_ref(cm_id_priv->qp); | |
943 | cm_id_priv->qp = NULL; | |
944 | } | |
945 | switch (cm_id_priv->state) { | |
946 | case IW_CM_STATE_ESTABLISHED: | |
947 | case IW_CM_STATE_CLOSING: | |
948 | cm_id_priv->state = IW_CM_STATE_IDLE; | |
949 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
950 | ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event); | |
951 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
952 | break; | |
953 | case IW_CM_STATE_DESTROYING: | |
954 | break; | |
955 | default: | |
956 | BUG(); | |
957 | } | |
958 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
959 | ||
960 | return ret; | |
961 | } | |
962 | ||
963 | static int process_event(struct iwcm_id_private *cm_id_priv, | |
964 | struct iw_cm_event *iw_event) | |
965 | { | |
966 | int ret = 0; | |
967 | ||
968 | switch (iw_event->event) { | |
969 | case IW_CM_EVENT_CONNECT_REQUEST: | |
970 | cm_conn_req_handler(cm_id_priv, iw_event); | |
971 | break; | |
972 | case IW_CM_EVENT_CONNECT_REPLY: | |
973 | ret = cm_conn_rep_handler(cm_id_priv, iw_event); | |
974 | break; | |
975 | case IW_CM_EVENT_ESTABLISHED: | |
976 | ret = cm_conn_est_handler(cm_id_priv, iw_event); | |
977 | break; | |
978 | case IW_CM_EVENT_DISCONNECT: | |
979 | cm_disconnect_handler(cm_id_priv, iw_event); | |
980 | break; | |
981 | case IW_CM_EVENT_CLOSE: | |
982 | ret = cm_close_handler(cm_id_priv, iw_event); | |
983 | break; | |
984 | default: | |
985 | BUG(); | |
986 | } | |
987 | ||
988 | return ret; | |
989 | } | |
990 | ||
991 | /* | |
992 | * Process events on the work_list for the cm_id. If the callback | |
993 | * function requests that the cm_id be deleted, a flag is set in the | |
994 | * cm_id flags to indicate that when the last reference is | |
995 | * removed, the cm_id is to be destroyed. This is necessary to | |
996 | * distinguish between an object that will be destroyed by the app | |
997 | * thread asleep on the destroy_comp list vs. an object destroyed | |
998 | * here synchronously when the last reference is removed. | |
999 | */ | |
c4028958 | 1000 | static void cm_work_handler(struct work_struct *_work) |
922a8e9f | 1001 | { |
4c1ac1b4 | 1002 | struct iwcm_work *work = container_of(_work, struct iwcm_work, work); |
33ba0fa9 | 1003 | struct iw_cm_event levent; |
922a8e9f TT |
1004 | struct iwcm_id_private *cm_id_priv = work->cm_id; |
1005 | unsigned long flags; | |
1006 | int empty; | |
1007 | int ret = 0; | |
1008 | ||
1009 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
1010 | empty = list_empty(&cm_id_priv->work_list); | |
1011 | while (!empty) { | |
1012 | work = list_entry(cm_id_priv->work_list.next, | |
1013 | struct iwcm_work, list); | |
1014 | list_del_init(&work->list); | |
1015 | empty = list_empty(&cm_id_priv->work_list); | |
33ba0fa9 | 1016 | levent = work->event; |
922a8e9f TT |
1017 | put_work(work); |
1018 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
1019 | ||
59c68ac3 SW |
1020 | if (!test_bit(IWCM_F_DROP_EVENTS, &cm_id_priv->flags)) { |
1021 | ret = process_event(cm_id_priv, &levent); | |
1022 | if (ret) | |
1023 | destroy_cm_id(&cm_id_priv->id); | |
1024 | } else | |
1025 | pr_debug("dropping event %d\n", levent.event); | |
1026 | if (iwcm_deref_id(cm_id_priv)) | |
922a8e9f | 1027 | return; |
e413a823 SW |
1028 | if (empty) |
1029 | return; | |
922a8e9f TT |
1030 | spin_lock_irqsave(&cm_id_priv->lock, flags); |
1031 | } | |
1032 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
1033 | } | |
1034 | ||
1035 | /* | |
1036 | * This function is called on interrupt context. Schedule events on | |
1037 | * the iwcm_wq thread to allow callback functions to downcall into | |
1038 | * the CM and/or block. Events are queued to a per-CM_ID | |
1039 | * work_list. If this is the first event on the work_list, the work | |
1040 | * element is also queued on the iwcm_wq thread. | |
1041 | * | |
1042 | * Each event holds a reference on the cm_id. Until the last posted | |
1043 | * event has been delivered and processed, the cm_id cannot be | |
1044 | * deleted. | |
1045 | * | |
1046 | * Returns: | |
1047 | * 0 - the event was handled. | |
1048 | * -ENOMEM - the event was not handled due to lack of resources. | |
1049 | */ | |
1050 | static int cm_event_handler(struct iw_cm_id *cm_id, | |
1051 | struct iw_cm_event *iw_event) | |
1052 | { | |
1053 | struct iwcm_work *work; | |
1054 | struct iwcm_id_private *cm_id_priv; | |
1055 | unsigned long flags; | |
1056 | int ret = 0; | |
1057 | ||
1058 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
1059 | ||
1060 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
1061 | work = get_work(cm_id_priv); | |
1062 | if (!work) { | |
1063 | ret = -ENOMEM; | |
1064 | goto out; | |
1065 | } | |
1066 | ||
c4028958 | 1067 | INIT_WORK(&work->work, cm_work_handler); |
922a8e9f TT |
1068 | work->cm_id = cm_id_priv; |
1069 | work->event = *iw_event; | |
1070 | ||
1071 | if ((work->event.event == IW_CM_EVENT_CONNECT_REQUEST || | |
1072 | work->event.event == IW_CM_EVENT_CONNECT_REPLY) && | |
1073 | work->event.private_data_len) { | |
715a588f | 1074 | ret = copy_private_data(&work->event); |
922a8e9f TT |
1075 | if (ret) { |
1076 | put_work(work); | |
1077 | goto out; | |
1078 | } | |
1079 | } | |
1080 | ||
1081 | atomic_inc(&cm_id_priv->refcount); | |
1082 | if (list_empty(&cm_id_priv->work_list)) { | |
1083 | list_add_tail(&work->list, &cm_id_priv->work_list); | |
1084 | queue_work(iwcm_wq, &work->work); | |
1085 | } else | |
1086 | list_add_tail(&work->list, &cm_id_priv->work_list); | |
1087 | out: | |
1088 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
1089 | return ret; | |
1090 | } | |
1091 | ||
1092 | static int iwcm_init_qp_init_attr(struct iwcm_id_private *cm_id_priv, | |
1093 | struct ib_qp_attr *qp_attr, | |
1094 | int *qp_attr_mask) | |
1095 | { | |
1096 | unsigned long flags; | |
1097 | int ret; | |
1098 | ||
1099 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
1100 | switch (cm_id_priv->state) { | |
1101 | case IW_CM_STATE_IDLE: | |
1102 | case IW_CM_STATE_CONN_SENT: | |
1103 | case IW_CM_STATE_CONN_RECV: | |
1104 | case IW_CM_STATE_ESTABLISHED: | |
1105 | *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS; | |
1ca8d156 | 1106 | qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE| |
922a8e9f TT |
1107 | IB_ACCESS_REMOTE_READ; |
1108 | ret = 0; | |
1109 | break; | |
1110 | default: | |
1111 | ret = -EINVAL; | |
1112 | break; | |
1113 | } | |
1114 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
1115 | return ret; | |
1116 | } | |
1117 | ||
1118 | static int iwcm_init_qp_rts_attr(struct iwcm_id_private *cm_id_priv, | |
1119 | struct ib_qp_attr *qp_attr, | |
1120 | int *qp_attr_mask) | |
1121 | { | |
1122 | unsigned long flags; | |
1123 | int ret; | |
1124 | ||
1125 | spin_lock_irqsave(&cm_id_priv->lock, flags); | |
1126 | switch (cm_id_priv->state) { | |
1127 | case IW_CM_STATE_IDLE: | |
1128 | case IW_CM_STATE_CONN_SENT: | |
1129 | case IW_CM_STATE_CONN_RECV: | |
1130 | case IW_CM_STATE_ESTABLISHED: | |
1131 | *qp_attr_mask = 0; | |
1132 | ret = 0; | |
1133 | break; | |
1134 | default: | |
1135 | ret = -EINVAL; | |
1136 | break; | |
1137 | } | |
1138 | spin_unlock_irqrestore(&cm_id_priv->lock, flags); | |
1139 | return ret; | |
1140 | } | |
1141 | ||
1142 | int iw_cm_init_qp_attr(struct iw_cm_id *cm_id, | |
1143 | struct ib_qp_attr *qp_attr, | |
1144 | int *qp_attr_mask) | |
1145 | { | |
1146 | struct iwcm_id_private *cm_id_priv; | |
1147 | int ret; | |
1148 | ||
1149 | cm_id_priv = container_of(cm_id, struct iwcm_id_private, id); | |
1150 | switch (qp_attr->qp_state) { | |
1151 | case IB_QPS_INIT: | |
1152 | case IB_QPS_RTR: | |
1153 | ret = iwcm_init_qp_init_attr(cm_id_priv, | |
1154 | qp_attr, qp_attr_mask); | |
1155 | break; | |
1156 | case IB_QPS_RTS: | |
1157 | ret = iwcm_init_qp_rts_attr(cm_id_priv, | |
1158 | qp_attr, qp_attr_mask); | |
1159 | break; | |
1160 | default: | |
1161 | ret = -EINVAL; | |
1162 | break; | |
1163 | } | |
1164 | return ret; | |
1165 | } | |
1166 | EXPORT_SYMBOL(iw_cm_init_qp_attr); | |
1167 | ||
1168 | static int __init iw_cm_init(void) | |
1169 | { | |
b493d91d FL |
1170 | int ret; |
1171 | ||
1172 | ret = iwpm_init(RDMA_NL_IWCM); | |
1173 | if (ret) | |
1174 | pr_err("iw_cm: couldn't init iwpm\n"); | |
c9901724 LR |
1175 | else |
1176 | rdma_nl_register(RDMA_NL_IWCM, iwcm_nl_cb_table); | |
75215e5b | 1177 | iwcm_wq = alloc_ordered_workqueue("iw_cm_wq", 0); |
922a8e9f TT |
1178 | if (!iwcm_wq) |
1179 | return -ENOMEM; | |
1180 | ||
2f0304d2 SW |
1181 | iwcm_ctl_table_hdr = register_net_sysctl(&init_net, "net/iw_cm", |
1182 | iwcm_ctl_table); | |
1183 | if (!iwcm_ctl_table_hdr) { | |
1184 | pr_err("iw_cm: couldn't register sysctl paths\n"); | |
1185 | destroy_workqueue(iwcm_wq); | |
1186 | return -ENOMEM; | |
1187 | } | |
1188 | ||
922a8e9f TT |
1189 | return 0; |
1190 | } | |
1191 | ||
1192 | static void __exit iw_cm_cleanup(void) | |
1193 | { | |
2f0304d2 | 1194 | unregister_net_sysctl_table(iwcm_ctl_table_hdr); |
922a8e9f | 1195 | destroy_workqueue(iwcm_wq); |
c9901724 | 1196 | rdma_nl_unregister(RDMA_NL_IWCM); |
b493d91d | 1197 | iwpm_exit(RDMA_NL_IWCM); |
922a8e9f TT |
1198 | } |
1199 | ||
e3bf14bd JG |
1200 | MODULE_ALIAS_RDMA_NETLINK(RDMA_NL_IWCM, 2); |
1201 | ||
922a8e9f TT |
1202 | module_init(iw_cm_init); |
1203 | module_exit(iw_cm_cleanup); |