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>
42 #include <linux/rbtree.h>
43 #include <linux/sched.h>
44 #include <linux/spinlock.h>
45 #include <linux/workqueue.h>
46 #include <linux/completion.h>
47 #include <linux/slab.h>
48 #include <linux/module.h>
49 #include <linux/sysctl.h>
50
51 #include <rdma/iw_cm.h>
52 #include <rdma/ib_addr.h>
53 #include <rdma/iw_portmap.h>
54 #include <rdma/rdma_netlink.h>
55
56 #include "iwcm.h"
57
58 MODULE_AUTHOR("Tom Tucker");
59 MODULE_DESCRIPTION("iWARP CM");
60 MODULE_LICENSE("Dual BSD/GPL");
61
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
iwcm_reject_msg(int reason)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
83 static struct rdma_nl_cbs iwcm_nl_cb_table[RDMA_NL_IWPM_NUM_OPS] = {
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 [RDMA_NL_IWPM_HELLO] = {.dump = iwpm_hello_cb}
92 };
93
94 static struct workqueue_struct *iwcm_wq;
95 struct iwcm_work {
96 struct work_struct work;
97 struct iwcm_id_private *cm_id;
98 struct list_head list;
99 struct iw_cm_event event;
100 struct list_head free_list;
101 };
102
103 static unsigned int default_backlog = 256;
104
105 static struct ctl_table_header *iwcm_ctl_table_hdr;
106 static struct ctl_table iwcm_ctl_table[] = {
107 {
108 .procname = "default_backlog",
109 .data = &default_backlog,
110 .maxlen = sizeof(default_backlog),
111 .mode = 0644,
112 .proc_handler = proc_dointvec_minmax,
113 .extra1 = SYSCTL_ZERO,
114 .extra2 = SYSCTL_INT_MAX,
115 },
116 };
117
118 /*
119 * The following services provide a mechanism for pre-allocating iwcm_work
120 * elements. The design pre-allocates them based on the cm_id type:
121 * LISTENING IDS: Get enough elements preallocated to handle the
122 * listen backlog.
123 * ACTIVE IDS: 4: CONNECT_REPLY, ESTABLISHED, DISCONNECT, CLOSE
124 * PASSIVE IDS: 3: ESTABLISHED, DISCONNECT, CLOSE
125 *
126 * Allocating them in connect and listen avoids having to deal
127 * with allocation failures on the event upcall from the provider (which
128 * is called in the interrupt context).
129 *
130 * One exception is when creating the cm_id for incoming connection requests.
131 * There are two cases:
132 * 1) in the event upcall, cm_event_handler(), for a listening cm_id. If
133 * the backlog is exceeded, then no more connection request events will
134 * be processed. cm_event_handler() returns -ENOMEM in this case. Its up
135 * to the provider to reject the connection request.
136 * 2) in the connection request workqueue handler, cm_conn_req_handler().
137 * If work elements cannot be allocated for the new connect request cm_id,
138 * then IWCM will call the provider reject method. This is ok since
139 * cm_conn_req_handler() runs in the workqueue thread context.
140 */
141
get_work(struct iwcm_id_private * cm_id_priv)142 static struct iwcm_work *get_work(struct iwcm_id_private *cm_id_priv)
143 {
144 struct iwcm_work *work;
145
146 if (list_empty(&cm_id_priv->work_free_list))
147 return NULL;
148 work = list_first_entry(&cm_id_priv->work_free_list, struct iwcm_work,
149 free_list);
150 list_del_init(&work->free_list);
151 return work;
152 }
153
put_work(struct iwcm_work * work)154 static void put_work(struct iwcm_work *work)
155 {
156 list_add(&work->free_list, &work->cm_id->work_free_list);
157 }
158
dealloc_work_entries(struct iwcm_id_private * cm_id_priv)159 static void dealloc_work_entries(struct iwcm_id_private *cm_id_priv)
160 {
161 struct list_head *e, *tmp;
162
163 list_for_each_safe(e, tmp, &cm_id_priv->work_free_list) {
164 list_del(e);
165 kfree(list_entry(e, struct iwcm_work, free_list));
166 }
167 }
168
alloc_work_entries(struct iwcm_id_private * cm_id_priv,int count)169 static int alloc_work_entries(struct iwcm_id_private *cm_id_priv, int count)
170 {
171 struct iwcm_work *work;
172
173 BUG_ON(!list_empty(&cm_id_priv->work_free_list));
174 while (count--) {
175 work = kmalloc(sizeof(struct iwcm_work), GFP_KERNEL);
176 if (!work) {
177 dealloc_work_entries(cm_id_priv);
178 return -ENOMEM;
179 }
180 work->cm_id = cm_id_priv;
181 INIT_LIST_HEAD(&work->list);
182 put_work(work);
183 }
184 return 0;
185 }
186
187 /*
188 * Save private data from incoming connection requests to
189 * iw_cm_event, so the low level driver doesn't have to. Adjust
190 * the event ptr to point to the local copy.
191 */
copy_private_data(struct iw_cm_event * event)192 static int copy_private_data(struct iw_cm_event *event)
193 {
194 void *p;
195
196 p = kmemdup(event->private_data, event->private_data_len, GFP_ATOMIC);
197 if (!p)
198 return -ENOMEM;
199 event->private_data = p;
200 return 0;
201 }
202
free_cm_id(struct iwcm_id_private * cm_id_priv)203 static void free_cm_id(struct iwcm_id_private *cm_id_priv)
204 {
205 dealloc_work_entries(cm_id_priv);
206 kfree(cm_id_priv);
207 }
208
209 /*
210 * Release a reference on cm_id. If the last reference is being
211 * released, free the cm_id and return 'true'.
212 */
iwcm_deref_id(struct iwcm_id_private * cm_id_priv)213 static bool iwcm_deref_id(struct iwcm_id_private *cm_id_priv)
214 {
215 if (refcount_dec_and_test(&cm_id_priv->refcount)) {
216 BUG_ON(!list_empty(&cm_id_priv->work_list));
217 free_cm_id(cm_id_priv);
218 return true;
219 }
220
221 return false;
222 }
223
add_ref(struct iw_cm_id * cm_id)224 static void add_ref(struct iw_cm_id *cm_id)
225 {
226 struct iwcm_id_private *cm_id_priv;
227 cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
228 refcount_inc(&cm_id_priv->refcount);
229 }
230
rem_ref(struct iw_cm_id * cm_id)231 static void rem_ref(struct iw_cm_id *cm_id)
232 {
233 struct iwcm_id_private *cm_id_priv;
234
235 cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
236
237 (void)iwcm_deref_id(cm_id_priv);
238 }
239
240 static int cm_event_handler(struct iw_cm_id *cm_id, struct iw_cm_event *event);
241
iw_create_cm_id(struct ib_device * device,iw_cm_handler cm_handler,void * context)242 struct iw_cm_id *iw_create_cm_id(struct ib_device *device,
243 iw_cm_handler cm_handler,
244 void *context)
245 {
246 struct iwcm_id_private *cm_id_priv;
247
248 cm_id_priv = kzalloc(sizeof(*cm_id_priv), GFP_KERNEL);
249 if (!cm_id_priv)
250 return ERR_PTR(-ENOMEM);
251
252 cm_id_priv->state = IW_CM_STATE_IDLE;
253 cm_id_priv->id.device = device;
254 cm_id_priv->id.cm_handler = cm_handler;
255 cm_id_priv->id.context = context;
256 cm_id_priv->id.event_handler = cm_event_handler;
257 cm_id_priv->id.add_ref = add_ref;
258 cm_id_priv->id.rem_ref = rem_ref;
259 spin_lock_init(&cm_id_priv->lock);
260 refcount_set(&cm_id_priv->refcount, 1);
261 init_waitqueue_head(&cm_id_priv->connect_wait);
262 init_completion(&cm_id_priv->destroy_comp);
263 INIT_LIST_HEAD(&cm_id_priv->work_list);
264 INIT_LIST_HEAD(&cm_id_priv->work_free_list);
265
266 return &cm_id_priv->id;
267 }
268 EXPORT_SYMBOL(iw_create_cm_id);
269
270
iwcm_modify_qp_err(struct ib_qp * qp)271 static int iwcm_modify_qp_err(struct ib_qp *qp)
272 {
273 struct ib_qp_attr qp_attr;
274
275 if (!qp)
276 return -EINVAL;
277
278 qp_attr.qp_state = IB_QPS_ERR;
279 return ib_modify_qp(qp, &qp_attr, IB_QP_STATE);
280 }
281
282 /*
283 * This is really the RDMAC CLOSING state. It is most similar to the
284 * IB SQD QP state.
285 */
iwcm_modify_qp_sqd(struct ib_qp * qp)286 static int iwcm_modify_qp_sqd(struct ib_qp *qp)
287 {
288 struct ib_qp_attr qp_attr;
289
290 BUG_ON(qp == NULL);
291 qp_attr.qp_state = IB_QPS_SQD;
292 return ib_modify_qp(qp, &qp_attr, IB_QP_STATE);
293 }
294
295 /*
296 * CM_ID <-- CLOSING
297 *
298 * Block if a passive or active connection is currently being processed. Then
299 * process the event as follows:
300 * - If we are ESTABLISHED, move to CLOSING and modify the QP state
301 * based on the abrupt flag
302 * - If the connection is already in the CLOSING or IDLE state, the peer is
303 * disconnecting concurrently with us and we've already seen the
304 * DISCONNECT event -- ignore the request and return 0
305 * - Disconnect on a listening endpoint returns -EINVAL
306 */
iw_cm_disconnect(struct iw_cm_id * cm_id,int abrupt)307 int iw_cm_disconnect(struct iw_cm_id *cm_id, int abrupt)
308 {
309 struct iwcm_id_private *cm_id_priv;
310 unsigned long flags;
311 int ret = 0;
312 struct ib_qp *qp = NULL;
313
314 cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
315 /* Wait if we're currently in a connect or accept downcall */
316 wait_event(cm_id_priv->connect_wait,
317 !test_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags));
318
319 spin_lock_irqsave(&cm_id_priv->lock, flags);
320 switch (cm_id_priv->state) {
321 case IW_CM_STATE_ESTABLISHED:
322 cm_id_priv->state = IW_CM_STATE_CLOSING;
323
324 /* QP could be <nul> for user-mode client */
325 if (cm_id_priv->qp)
326 qp = cm_id_priv->qp;
327 else
328 ret = -EINVAL;
329 break;
330 case IW_CM_STATE_LISTEN:
331 ret = -EINVAL;
332 break;
333 case IW_CM_STATE_CLOSING:
334 /* remote peer closed first */
335 case IW_CM_STATE_IDLE:
336 /* accept or connect returned !0 */
337 break;
338 case IW_CM_STATE_CONN_RECV:
339 /*
340 * App called disconnect before/without calling accept after
341 * connect_request event delivered.
342 */
343 break;
344 case IW_CM_STATE_CONN_SENT:
345 /* Can only get here if wait above fails */
346 default:
347 BUG();
348 }
349 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
350
351 if (qp) {
352 if (abrupt)
353 ret = iwcm_modify_qp_err(qp);
354 else
355 ret = iwcm_modify_qp_sqd(qp);
356
357 /*
358 * If both sides are disconnecting the QP could
359 * already be in ERR or SQD states
360 */
361 ret = 0;
362 }
363
364 return ret;
365 }
366 EXPORT_SYMBOL(iw_cm_disconnect);
367
368 /*
369 * CM_ID <-- DESTROYING
370 *
371 * Clean up all resources associated with the connection and release
372 * the initial reference taken by iw_create_cm_id.
373 *
374 * Returns true if and only if the last cm_id_priv reference has been dropped.
375 */
destroy_cm_id(struct iw_cm_id * cm_id)376 static bool destroy_cm_id(struct iw_cm_id *cm_id)
377 {
378 struct iwcm_id_private *cm_id_priv;
379 struct ib_qp *qp;
380 unsigned long flags;
381
382 cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
383 /*
384 * Wait if we're currently in a connect or accept downcall. A
385 * listening endpoint should never block here.
386 */
387 wait_event(cm_id_priv->connect_wait,
388 !test_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags));
389
390 /*
391 * Since we're deleting the cm_id, drop any events that
392 * might arrive before the last dereference.
393 */
394 set_bit(IWCM_F_DROP_EVENTS, &cm_id_priv->flags);
395
396 spin_lock_irqsave(&cm_id_priv->lock, flags);
397 qp = cm_id_priv->qp;
398 cm_id_priv->qp = NULL;
399
400 switch (cm_id_priv->state) {
401 case IW_CM_STATE_LISTEN:
402 cm_id_priv->state = IW_CM_STATE_DESTROYING;
403 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
404 /* destroy the listening endpoint */
405 cm_id->device->ops.iw_destroy_listen(cm_id);
406 spin_lock_irqsave(&cm_id_priv->lock, flags);
407 break;
408 case IW_CM_STATE_ESTABLISHED:
409 cm_id_priv->state = IW_CM_STATE_DESTROYING;
410 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
411 /* Abrupt close of the connection */
412 (void)iwcm_modify_qp_err(qp);
413 spin_lock_irqsave(&cm_id_priv->lock, flags);
414 break;
415 case IW_CM_STATE_IDLE:
416 case IW_CM_STATE_CLOSING:
417 cm_id_priv->state = IW_CM_STATE_DESTROYING;
418 break;
419 case IW_CM_STATE_CONN_RECV:
420 /*
421 * App called destroy before/without calling accept after
422 * receiving connection request event notification or
423 * returned non zero from the event callback function.
424 * In either case, must tell the provider to reject.
425 */
426 cm_id_priv->state = IW_CM_STATE_DESTROYING;
427 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
428 cm_id->device->ops.iw_reject(cm_id, NULL, 0);
429 spin_lock_irqsave(&cm_id_priv->lock, flags);
430 break;
431 case IW_CM_STATE_CONN_SENT:
432 case IW_CM_STATE_DESTROYING:
433 default:
434 BUG();
435 break;
436 }
437 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
438 if (qp)
439 cm_id_priv->id.device->ops.iw_rem_ref(qp);
440
441 if (cm_id->mapped) {
442 iwpm_remove_mapinfo(&cm_id->local_addr, &cm_id->m_local_addr);
443 iwpm_remove_mapping(&cm_id->local_addr, RDMA_NL_IWCM);
444 }
445
446 return iwcm_deref_id(cm_id_priv);
447 }
448
449 /*
450 * This function is only called by the application thread and cannot
451 * be called by the event thread. The function will wait for all
452 * references to be released on the cm_id and then kfree the cm_id
453 * object.
454 */
iw_destroy_cm_id(struct iw_cm_id * cm_id)455 void iw_destroy_cm_id(struct iw_cm_id *cm_id)
456 {
457 if (!destroy_cm_id(cm_id))
458 flush_workqueue(iwcm_wq);
459 }
460 EXPORT_SYMBOL(iw_destroy_cm_id);
461
462 /**
463 * iw_cm_check_wildcard - If IP address is 0 then use original
464 * @pm_addr: sockaddr containing the ip to check for wildcard
465 * @cm_addr: sockaddr containing the actual IP address
466 * @cm_outaddr: sockaddr to set IP addr which leaving port
467 *
468 * Checks the pm_addr for wildcard and then sets cm_outaddr's
469 * IP to the actual (cm_addr).
470 */
iw_cm_check_wildcard(struct sockaddr_storage * pm_addr,struct sockaddr_storage * cm_addr,struct sockaddr_storage * cm_outaddr)471 static void iw_cm_check_wildcard(struct sockaddr_storage *pm_addr,
472 struct sockaddr_storage *cm_addr,
473 struct sockaddr_storage *cm_outaddr)
474 {
475 if (pm_addr->ss_family == AF_INET) {
476 struct sockaddr_in *pm4_addr = (struct sockaddr_in *)pm_addr;
477
478 if (pm4_addr->sin_addr.s_addr == htonl(INADDR_ANY)) {
479 struct sockaddr_in *cm4_addr =
480 (struct sockaddr_in *)cm_addr;
481 struct sockaddr_in *cm4_outaddr =
482 (struct sockaddr_in *)cm_outaddr;
483
484 cm4_outaddr->sin_addr = cm4_addr->sin_addr;
485 }
486 } else {
487 struct sockaddr_in6 *pm6_addr = (struct sockaddr_in6 *)pm_addr;
488
489 if (ipv6_addr_type(&pm6_addr->sin6_addr) == IPV6_ADDR_ANY) {
490 struct sockaddr_in6 *cm6_addr =
491 (struct sockaddr_in6 *)cm_addr;
492 struct sockaddr_in6 *cm6_outaddr =
493 (struct sockaddr_in6 *)cm_outaddr;
494
495 cm6_outaddr->sin6_addr = cm6_addr->sin6_addr;
496 }
497 }
498 }
499
500 /**
501 * iw_cm_map - Use portmapper to map the ports
502 * @cm_id: connection manager pointer
503 * @active: Indicates the active side when true
504 * returns nonzero for error only if iwpm_create_mapinfo() fails
505 *
506 * Tries to add a mapping for a port using the Portmapper. If
507 * successful in mapping the IP/Port it will check the remote
508 * mapped IP address for a wildcard IP address and replace the
509 * zero IP address with the remote_addr.
510 */
iw_cm_map(struct iw_cm_id * cm_id,bool active)511 static int iw_cm_map(struct iw_cm_id *cm_id, bool active)
512 {
513 const char *devname = dev_name(&cm_id->device->dev);
514 const char *ifname = cm_id->device->iw_ifname;
515 struct iwpm_dev_data pm_reg_msg = {};
516 struct iwpm_sa_data pm_msg;
517 int status;
518
519 if (strlen(devname) >= sizeof(pm_reg_msg.dev_name) ||
520 strlen(ifname) >= sizeof(pm_reg_msg.if_name))
521 return -EINVAL;
522
523 cm_id->m_local_addr = cm_id->local_addr;
524 cm_id->m_remote_addr = cm_id->remote_addr;
525
526 strcpy(pm_reg_msg.dev_name, devname);
527 strcpy(pm_reg_msg.if_name, ifname);
528
529 if (iwpm_register_pid(&pm_reg_msg, RDMA_NL_IWCM) ||
530 !iwpm_valid_pid())
531 return 0;
532
533 cm_id->mapped = true;
534 pm_msg.loc_addr = cm_id->local_addr;
535 pm_msg.rem_addr = cm_id->remote_addr;
536 pm_msg.flags = (cm_id->device->iw_driver_flags & IW_F_NO_PORT_MAP) ?
537 IWPM_FLAGS_NO_PORT_MAP : 0;
538 if (active)
539 status = iwpm_add_and_query_mapping(&pm_msg,
540 RDMA_NL_IWCM);
541 else
542 status = iwpm_add_mapping(&pm_msg, RDMA_NL_IWCM);
543
544 if (!status) {
545 cm_id->m_local_addr = pm_msg.mapped_loc_addr;
546 if (active) {
547 cm_id->m_remote_addr = pm_msg.mapped_rem_addr;
548 iw_cm_check_wildcard(&pm_msg.mapped_rem_addr,
549 &cm_id->remote_addr,
550 &cm_id->m_remote_addr);
551 }
552 }
553
554 return iwpm_create_mapinfo(&cm_id->local_addr,
555 &cm_id->m_local_addr,
556 RDMA_NL_IWCM, pm_msg.flags);
557 }
558
559 /*
560 * CM_ID <-- LISTEN
561 *
562 * Start listening for connect requests. Generates one CONNECT_REQUEST
563 * event for each inbound connect request.
564 */
iw_cm_listen(struct iw_cm_id * cm_id,int backlog)565 int iw_cm_listen(struct iw_cm_id *cm_id, int backlog)
566 {
567 struct iwcm_id_private *cm_id_priv;
568 unsigned long flags;
569 int ret;
570
571 cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
572
573 if (!backlog)
574 backlog = default_backlog;
575
576 ret = alloc_work_entries(cm_id_priv, backlog);
577 if (ret)
578 return ret;
579
580 spin_lock_irqsave(&cm_id_priv->lock, flags);
581 switch (cm_id_priv->state) {
582 case IW_CM_STATE_IDLE:
583 cm_id_priv->state = IW_CM_STATE_LISTEN;
584 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
585 ret = iw_cm_map(cm_id, false);
586 if (!ret)
587 ret = cm_id->device->ops.iw_create_listen(cm_id,
588 backlog);
589 if (ret)
590 cm_id_priv->state = IW_CM_STATE_IDLE;
591 spin_lock_irqsave(&cm_id_priv->lock, flags);
592 break;
593 default:
594 ret = -EINVAL;
595 }
596 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
597
598 return ret;
599 }
600 EXPORT_SYMBOL(iw_cm_listen);
601
602 /*
603 * CM_ID <-- IDLE
604 *
605 * Rejects an inbound connection request. No events are generated.
606 */
iw_cm_reject(struct iw_cm_id * cm_id,const void * private_data,u8 private_data_len)607 int iw_cm_reject(struct iw_cm_id *cm_id,
608 const void *private_data,
609 u8 private_data_len)
610 {
611 struct iwcm_id_private *cm_id_priv;
612 unsigned long flags;
613 int ret;
614
615 cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
616 set_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
617
618 spin_lock_irqsave(&cm_id_priv->lock, flags);
619 if (cm_id_priv->state != IW_CM_STATE_CONN_RECV) {
620 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
621 clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
622 wake_up_all(&cm_id_priv->connect_wait);
623 return -EINVAL;
624 }
625 cm_id_priv->state = IW_CM_STATE_IDLE;
626 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
627
628 ret = cm_id->device->ops.iw_reject(cm_id, private_data,
629 private_data_len);
630
631 clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
632 wake_up_all(&cm_id_priv->connect_wait);
633
634 return ret;
635 }
636 EXPORT_SYMBOL(iw_cm_reject);
637
638 /*
639 * CM_ID <-- ESTABLISHED
640 *
641 * Accepts an inbound connection request and generates an ESTABLISHED
642 * event. Callers of iw_cm_disconnect and iw_destroy_cm_id will block
643 * until the ESTABLISHED event is received from the provider.
644 */
iw_cm_accept(struct iw_cm_id * cm_id,struct iw_cm_conn_param * iw_param)645 int iw_cm_accept(struct iw_cm_id *cm_id,
646 struct iw_cm_conn_param *iw_param)
647 {
648 struct iwcm_id_private *cm_id_priv;
649 struct ib_qp *qp;
650 unsigned long flags;
651 int ret;
652
653 cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
654 set_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
655
656 spin_lock_irqsave(&cm_id_priv->lock, flags);
657 if (cm_id_priv->state != IW_CM_STATE_CONN_RECV) {
658 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
659 clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
660 wake_up_all(&cm_id_priv->connect_wait);
661 return -EINVAL;
662 }
663 /* Get the ib_qp given the QPN */
664 qp = cm_id->device->ops.iw_get_qp(cm_id->device, iw_param->qpn);
665 if (!qp) {
666 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
667 clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
668 wake_up_all(&cm_id_priv->connect_wait);
669 return -EINVAL;
670 }
671 cm_id->device->ops.iw_add_ref(qp);
672 cm_id_priv->qp = qp;
673 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
674
675 ret = cm_id->device->ops.iw_accept(cm_id, iw_param);
676 if (ret) {
677 /* An error on accept precludes provider events */
678 BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_RECV);
679 cm_id_priv->state = IW_CM_STATE_IDLE;
680 spin_lock_irqsave(&cm_id_priv->lock, flags);
681 qp = cm_id_priv->qp;
682 cm_id_priv->qp = NULL;
683 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
684 if (qp)
685 cm_id->device->ops.iw_rem_ref(qp);
686 clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
687 wake_up_all(&cm_id_priv->connect_wait);
688 }
689
690 return ret;
691 }
692 EXPORT_SYMBOL(iw_cm_accept);
693
694 /*
695 * Active Side: CM_ID <-- CONN_SENT
696 *
697 * If successful, results in the generation of a CONNECT_REPLY
698 * event. iw_cm_disconnect and iw_cm_destroy will block until the
699 * CONNECT_REPLY event is received from the provider.
700 */
iw_cm_connect(struct iw_cm_id * cm_id,struct iw_cm_conn_param * iw_param)701 int iw_cm_connect(struct iw_cm_id *cm_id, struct iw_cm_conn_param *iw_param)
702 {
703 struct iwcm_id_private *cm_id_priv;
704 int ret;
705 unsigned long flags;
706 struct ib_qp *qp = NULL;
707
708 cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
709
710 ret = alloc_work_entries(cm_id_priv, 4);
711 if (ret)
712 return ret;
713
714 set_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
715 spin_lock_irqsave(&cm_id_priv->lock, flags);
716
717 if (cm_id_priv->state != IW_CM_STATE_IDLE) {
718 ret = -EINVAL;
719 goto err;
720 }
721
722 /* Get the ib_qp given the QPN */
723 qp = cm_id->device->ops.iw_get_qp(cm_id->device, iw_param->qpn);
724 if (!qp) {
725 ret = -EINVAL;
726 goto err;
727 }
728 cm_id->device->ops.iw_add_ref(qp);
729 cm_id_priv->qp = qp;
730 cm_id_priv->state = IW_CM_STATE_CONN_SENT;
731 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
732
733 ret = iw_cm_map(cm_id, true);
734 if (!ret)
735 ret = cm_id->device->ops.iw_connect(cm_id, iw_param);
736 if (!ret)
737 return 0; /* success */
738
739 spin_lock_irqsave(&cm_id_priv->lock, flags);
740 qp = cm_id_priv->qp;
741 cm_id_priv->qp = NULL;
742 cm_id_priv->state = IW_CM_STATE_IDLE;
743 err:
744 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
745 if (qp)
746 cm_id->device->ops.iw_rem_ref(qp);
747 clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
748 wake_up_all(&cm_id_priv->connect_wait);
749 return ret;
750 }
751 EXPORT_SYMBOL(iw_cm_connect);
752
753 /*
754 * Passive Side: new CM_ID <-- CONN_RECV
755 *
756 * Handles an inbound connect request. The function creates a new
757 * iw_cm_id to represent the new connection and inherits the client
758 * callback function and other attributes from the listening parent.
759 *
760 * The work item contains a pointer to the listen_cm_id and the event. The
761 * listen_cm_id contains the client cm_handler, context and
762 * device. These are copied when the device is cloned. The event
763 * contains the new four tuple.
764 *
765 * An error on the child should not affect the parent, so this
766 * function does not return a value.
767 */
cm_conn_req_handler(struct iwcm_id_private * listen_id_priv,struct iw_cm_event * iw_event)768 static void cm_conn_req_handler(struct iwcm_id_private *listen_id_priv,
769 struct iw_cm_event *iw_event)
770 {
771 unsigned long flags;
772 struct iw_cm_id *cm_id;
773 struct iwcm_id_private *cm_id_priv;
774 int ret;
775
776 /*
777 * The provider should never generate a connection request
778 * event with a bad status.
779 */
780 BUG_ON(iw_event->status);
781
782 cm_id = iw_create_cm_id(listen_id_priv->id.device,
783 listen_id_priv->id.cm_handler,
784 listen_id_priv->id.context);
785 /* If the cm_id could not be created, ignore the request */
786 if (IS_ERR(cm_id))
787 goto out;
788
789 cm_id->provider_data = iw_event->provider_data;
790 cm_id->m_local_addr = iw_event->local_addr;
791 cm_id->m_remote_addr = iw_event->remote_addr;
792 cm_id->local_addr = listen_id_priv->id.local_addr;
793
794 ret = iwpm_get_remote_info(&listen_id_priv->id.m_local_addr,
795 &iw_event->remote_addr,
796 &cm_id->remote_addr,
797 RDMA_NL_IWCM);
798 if (ret) {
799 cm_id->remote_addr = iw_event->remote_addr;
800 } else {
801 iw_cm_check_wildcard(&listen_id_priv->id.m_local_addr,
802 &iw_event->local_addr,
803 &cm_id->local_addr);
804 iw_event->local_addr = cm_id->local_addr;
805 iw_event->remote_addr = cm_id->remote_addr;
806 }
807
808 cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
809 cm_id_priv->state = IW_CM_STATE_CONN_RECV;
810
811 /*
812 * We could be destroying the listening id. If so, ignore this
813 * upcall.
814 */
815 spin_lock_irqsave(&listen_id_priv->lock, flags);
816 if (listen_id_priv->state != IW_CM_STATE_LISTEN) {
817 spin_unlock_irqrestore(&listen_id_priv->lock, flags);
818 iw_cm_reject(cm_id, NULL, 0);
819 iw_destroy_cm_id(cm_id);
820 goto out;
821 }
822 spin_unlock_irqrestore(&listen_id_priv->lock, flags);
823
824 ret = alloc_work_entries(cm_id_priv, 3);
825 if (ret) {
826 iw_cm_reject(cm_id, NULL, 0);
827 iw_destroy_cm_id(cm_id);
828 goto out;
829 }
830
831 /* Call the client CM handler */
832 ret = cm_id->cm_handler(cm_id, iw_event);
833 if (ret) {
834 iw_cm_reject(cm_id, NULL, 0);
835 iw_destroy_cm_id(cm_id);
836 }
837
838 out:
839 if (iw_event->private_data_len)
840 kfree(iw_event->private_data);
841 }
842
843 /*
844 * Passive Side: CM_ID <-- ESTABLISHED
845 *
846 * The provider generated an ESTABLISHED event which means that
847 * the MPA negotion has completed successfully and we are now in MPA
848 * FPDU mode.
849 *
850 * This event can only be received in the CONN_RECV state. If the
851 * remote peer closed, the ESTABLISHED event would be received followed
852 * by the CLOSE event. If the app closes, it will block until we wake
853 * it up after processing this event.
854 */
cm_conn_est_handler(struct iwcm_id_private * cm_id_priv,struct iw_cm_event * iw_event)855 static int cm_conn_est_handler(struct iwcm_id_private *cm_id_priv,
856 struct iw_cm_event *iw_event)
857 {
858 unsigned long flags;
859 int ret;
860
861 spin_lock_irqsave(&cm_id_priv->lock, flags);
862
863 /*
864 * We clear the CONNECT_WAIT bit here to allow the callback
865 * function to call iw_cm_disconnect. Calling iw_destroy_cm_id
866 * from a callback handler is not allowed.
867 */
868 clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
869 BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_RECV);
870 cm_id_priv->state = IW_CM_STATE_ESTABLISHED;
871 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
872 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event);
873 wake_up_all(&cm_id_priv->connect_wait);
874
875 return ret;
876 }
877
878 /*
879 * Active Side: CM_ID <-- ESTABLISHED
880 *
881 * The app has called connect and is waiting for the established event to
882 * post it's requests to the server. This event will wake up anyone
883 * blocked in iw_cm_disconnect or iw_destroy_id.
884 */
cm_conn_rep_handler(struct iwcm_id_private * cm_id_priv,struct iw_cm_event * iw_event)885 static int cm_conn_rep_handler(struct iwcm_id_private *cm_id_priv,
886 struct iw_cm_event *iw_event)
887 {
888 struct ib_qp *qp = NULL;
889 unsigned long flags;
890 int ret;
891
892 spin_lock_irqsave(&cm_id_priv->lock, flags);
893 /*
894 * Clear the connect wait bit so a callback function calling
895 * iw_cm_disconnect will not wait and deadlock this thread
896 */
897 clear_bit(IWCM_F_CONNECT_WAIT, &cm_id_priv->flags);
898 BUG_ON(cm_id_priv->state != IW_CM_STATE_CONN_SENT);
899 if (iw_event->status == 0) {
900 cm_id_priv->id.m_local_addr = iw_event->local_addr;
901 cm_id_priv->id.m_remote_addr = iw_event->remote_addr;
902 iw_event->local_addr = cm_id_priv->id.local_addr;
903 iw_event->remote_addr = cm_id_priv->id.remote_addr;
904 cm_id_priv->state = IW_CM_STATE_ESTABLISHED;
905 } else {
906 /* REJECTED or RESET */
907 qp = cm_id_priv->qp;
908 cm_id_priv->qp = NULL;
909 cm_id_priv->state = IW_CM_STATE_IDLE;
910 }
911 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
912 if (qp)
913 cm_id_priv->id.device->ops.iw_rem_ref(qp);
914 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event);
915
916 if (iw_event->private_data_len)
917 kfree(iw_event->private_data);
918
919 /* Wake up waiters on connect complete */
920 wake_up_all(&cm_id_priv->connect_wait);
921
922 return ret;
923 }
924
925 /*
926 * CM_ID <-- CLOSING
927 *
928 * If in the ESTABLISHED state, move to CLOSING.
929 */
cm_disconnect_handler(struct iwcm_id_private * cm_id_priv,struct iw_cm_event * iw_event)930 static void cm_disconnect_handler(struct iwcm_id_private *cm_id_priv,
931 struct iw_cm_event *iw_event)
932 {
933 unsigned long flags;
934
935 spin_lock_irqsave(&cm_id_priv->lock, flags);
936 if (cm_id_priv->state == IW_CM_STATE_ESTABLISHED)
937 cm_id_priv->state = IW_CM_STATE_CLOSING;
938 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
939 }
940
941 /*
942 * CM_ID <-- IDLE
943 *
944 * If in the ESTBLISHED or CLOSING states, the QP will have have been
945 * moved by the provider to the ERR state. Disassociate the CM_ID from
946 * the QP, move to IDLE, and remove the 'connected' reference.
947 *
948 * If in some other state, the cm_id was destroyed asynchronously.
949 * This is the last reference that will result in waking up
950 * the app thread blocked in iw_destroy_cm_id.
951 */
cm_close_handler(struct iwcm_id_private * cm_id_priv,struct iw_cm_event * iw_event)952 static int cm_close_handler(struct iwcm_id_private *cm_id_priv,
953 struct iw_cm_event *iw_event)
954 {
955 struct ib_qp *qp;
956 unsigned long flags;
957 int ret = 0, notify_event = 0;
958 spin_lock_irqsave(&cm_id_priv->lock, flags);
959 qp = cm_id_priv->qp;
960 cm_id_priv->qp = NULL;
961
962 switch (cm_id_priv->state) {
963 case IW_CM_STATE_ESTABLISHED:
964 case IW_CM_STATE_CLOSING:
965 cm_id_priv->state = IW_CM_STATE_IDLE;
966 notify_event = 1;
967 break;
968 case IW_CM_STATE_DESTROYING:
969 break;
970 default:
971 BUG();
972 }
973 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
974
975 if (qp)
976 cm_id_priv->id.device->ops.iw_rem_ref(qp);
977 if (notify_event)
978 ret = cm_id_priv->id.cm_handler(&cm_id_priv->id, iw_event);
979 return ret;
980 }
981
process_event(struct iwcm_id_private * cm_id_priv,struct iw_cm_event * iw_event)982 static int process_event(struct iwcm_id_private *cm_id_priv,
983 struct iw_cm_event *iw_event)
984 {
985 int ret = 0;
986
987 switch (iw_event->event) {
988 case IW_CM_EVENT_CONNECT_REQUEST:
989 cm_conn_req_handler(cm_id_priv, iw_event);
990 break;
991 case IW_CM_EVENT_CONNECT_REPLY:
992 ret = cm_conn_rep_handler(cm_id_priv, iw_event);
993 break;
994 case IW_CM_EVENT_ESTABLISHED:
995 ret = cm_conn_est_handler(cm_id_priv, iw_event);
996 break;
997 case IW_CM_EVENT_DISCONNECT:
998 cm_disconnect_handler(cm_id_priv, iw_event);
999 break;
1000 case IW_CM_EVENT_CLOSE:
1001 ret = cm_close_handler(cm_id_priv, iw_event);
1002 break;
1003 default:
1004 BUG();
1005 }
1006
1007 return ret;
1008 }
1009
1010 /*
1011 * Process events on the work_list for the cm_id. If the callback
1012 * function requests that the cm_id be deleted, a flag is set in the
1013 * cm_id flags to indicate that when the last reference is
1014 * removed, the cm_id is to be destroyed. This is necessary to
1015 * distinguish between an object that will be destroyed by the app
1016 * thread asleep on the destroy_comp list vs. an object destroyed
1017 * here synchronously when the last reference is removed.
1018 */
cm_work_handler(struct work_struct * _work)1019 static void cm_work_handler(struct work_struct *_work)
1020 {
1021 struct iwcm_work *work = container_of(_work, struct iwcm_work, work);
1022 struct iw_cm_event levent;
1023 struct iwcm_id_private *cm_id_priv = work->cm_id;
1024 unsigned long flags;
1025 int ret = 0;
1026
1027 spin_lock_irqsave(&cm_id_priv->lock, flags);
1028 while (!list_empty(&cm_id_priv->work_list)) {
1029 work = list_first_entry(&cm_id_priv->work_list,
1030 struct iwcm_work, list);
1031 list_del_init(&work->list);
1032 levent = work->event;
1033 put_work(work);
1034 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1035
1036 if (!test_bit(IWCM_F_DROP_EVENTS, &cm_id_priv->flags)) {
1037 ret = process_event(cm_id_priv, &levent);
1038 if (ret)
1039 WARN_ON_ONCE(destroy_cm_id(&cm_id_priv->id));
1040 } else
1041 pr_debug("dropping event %d\n", levent.event);
1042 if (iwcm_deref_id(cm_id_priv))
1043 return;
1044 spin_lock_irqsave(&cm_id_priv->lock, flags);
1045 }
1046 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1047 }
1048
1049 /*
1050 * This function is called on interrupt context. Schedule events on
1051 * the iwcm_wq thread to allow callback functions to downcall into
1052 * the CM and/or block. Events are queued to a per-CM_ID
1053 * work_list. If this is the first event on the work_list, the work
1054 * element is also queued on the iwcm_wq thread.
1055 *
1056 * Each event holds a reference on the cm_id. Until the last posted
1057 * event has been delivered and processed, the cm_id cannot be
1058 * deleted.
1059 *
1060 * Returns:
1061 * 0 - the event was handled.
1062 * -ENOMEM - the event was not handled due to lack of resources.
1063 */
cm_event_handler(struct iw_cm_id * cm_id,struct iw_cm_event * iw_event)1064 static int cm_event_handler(struct iw_cm_id *cm_id,
1065 struct iw_cm_event *iw_event)
1066 {
1067 struct iwcm_work *work;
1068 struct iwcm_id_private *cm_id_priv;
1069 unsigned long flags;
1070 int ret = 0;
1071
1072 cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
1073
1074 spin_lock_irqsave(&cm_id_priv->lock, flags);
1075 work = get_work(cm_id_priv);
1076 if (!work) {
1077 ret = -ENOMEM;
1078 goto out;
1079 }
1080
1081 INIT_WORK(&work->work, cm_work_handler);
1082 work->cm_id = cm_id_priv;
1083 work->event = *iw_event;
1084
1085 if ((work->event.event == IW_CM_EVENT_CONNECT_REQUEST ||
1086 work->event.event == IW_CM_EVENT_CONNECT_REPLY) &&
1087 work->event.private_data_len) {
1088 ret = copy_private_data(&work->event);
1089 if (ret) {
1090 put_work(work);
1091 goto out;
1092 }
1093 }
1094
1095 refcount_inc(&cm_id_priv->refcount);
1096 list_add_tail(&work->list, &cm_id_priv->work_list);
1097 queue_work(iwcm_wq, &work->work);
1098 out:
1099 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1100 return ret;
1101 }
1102
iwcm_init_qp_init_attr(struct iwcm_id_private * cm_id_priv,struct ib_qp_attr * qp_attr,int * qp_attr_mask)1103 static int iwcm_init_qp_init_attr(struct iwcm_id_private *cm_id_priv,
1104 struct ib_qp_attr *qp_attr,
1105 int *qp_attr_mask)
1106 {
1107 unsigned long flags;
1108 int ret;
1109
1110 spin_lock_irqsave(&cm_id_priv->lock, flags);
1111 switch (cm_id_priv->state) {
1112 case IW_CM_STATE_IDLE:
1113 case IW_CM_STATE_CONN_SENT:
1114 case IW_CM_STATE_CONN_RECV:
1115 case IW_CM_STATE_ESTABLISHED:
1116 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS;
1117 qp_attr->qp_access_flags = IB_ACCESS_REMOTE_WRITE|
1118 IB_ACCESS_REMOTE_READ;
1119 ret = 0;
1120 break;
1121 default:
1122 ret = -EINVAL;
1123 break;
1124 }
1125 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1126 return ret;
1127 }
1128
iwcm_init_qp_rts_attr(struct iwcm_id_private * cm_id_priv,struct ib_qp_attr * qp_attr,int * qp_attr_mask)1129 static int iwcm_init_qp_rts_attr(struct iwcm_id_private *cm_id_priv,
1130 struct ib_qp_attr *qp_attr,
1131 int *qp_attr_mask)
1132 {
1133 unsigned long flags;
1134 int ret;
1135
1136 spin_lock_irqsave(&cm_id_priv->lock, flags);
1137 switch (cm_id_priv->state) {
1138 case IW_CM_STATE_IDLE:
1139 case IW_CM_STATE_CONN_SENT:
1140 case IW_CM_STATE_CONN_RECV:
1141 case IW_CM_STATE_ESTABLISHED:
1142 *qp_attr_mask = 0;
1143 ret = 0;
1144 break;
1145 default:
1146 ret = -EINVAL;
1147 break;
1148 }
1149 spin_unlock_irqrestore(&cm_id_priv->lock, flags);
1150 return ret;
1151 }
1152
iw_cm_init_qp_attr(struct iw_cm_id * cm_id,struct ib_qp_attr * qp_attr,int * qp_attr_mask)1153 int iw_cm_init_qp_attr(struct iw_cm_id *cm_id,
1154 struct ib_qp_attr *qp_attr,
1155 int *qp_attr_mask)
1156 {
1157 struct iwcm_id_private *cm_id_priv;
1158 int ret;
1159
1160 cm_id_priv = container_of(cm_id, struct iwcm_id_private, id);
1161 switch (qp_attr->qp_state) {
1162 case IB_QPS_INIT:
1163 case IB_QPS_RTR:
1164 ret = iwcm_init_qp_init_attr(cm_id_priv,
1165 qp_attr, qp_attr_mask);
1166 break;
1167 case IB_QPS_RTS:
1168 ret = iwcm_init_qp_rts_attr(cm_id_priv,
1169 qp_attr, qp_attr_mask);
1170 break;
1171 default:
1172 ret = -EINVAL;
1173 break;
1174 }
1175 return ret;
1176 }
1177 EXPORT_SYMBOL(iw_cm_init_qp_attr);
1178
iw_cm_init(void)1179 static int __init iw_cm_init(void)
1180 {
1181 int ret;
1182
1183 ret = iwpm_init(RDMA_NL_IWCM);
1184 if (ret)
1185 return ret;
1186
1187 iwcm_wq = alloc_ordered_workqueue("iw_cm_wq", WQ_MEM_RECLAIM);
1188 if (!iwcm_wq)
1189 goto err_alloc;
1190
1191 iwcm_ctl_table_hdr = register_net_sysctl(&init_net, "net/iw_cm",
1192 iwcm_ctl_table);
1193 if (!iwcm_ctl_table_hdr) {
1194 pr_err("iw_cm: couldn't register sysctl paths\n");
1195 goto err_sysctl;
1196 }
1197
1198 rdma_nl_register(RDMA_NL_IWCM, iwcm_nl_cb_table);
1199 return 0;
1200
1201 err_sysctl:
1202 destroy_workqueue(iwcm_wq);
1203 err_alloc:
1204 iwpm_exit(RDMA_NL_IWCM);
1205 return -ENOMEM;
1206 }
1207
iw_cm_cleanup(void)1208 static void __exit iw_cm_cleanup(void)
1209 {
1210 rdma_nl_unregister(RDMA_NL_IWCM);
1211 unregister_net_sysctl_table(iwcm_ctl_table_hdr);
1212 destroy_workqueue(iwcm_wq);
1213 iwpm_exit(RDMA_NL_IWCM);
1214 }
1215
1216 MODULE_ALIAS_RDMA_NETLINK(RDMA_NL_IWCM, 2);
1217
1218 module_init(iw_cm_init);
1219 module_exit(iw_cm_cleanup);
1220