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Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
[deliverable/linux.git] / drivers / infiniband / core / cma.c
1 /*
2 * Copyright (c) 2005 Voltaire Inc. All rights reserved.
3 * Copyright (c) 2002-2005, Network Appliance, Inc. All rights reserved.
4 * Copyright (c) 1999-2005, Mellanox Technologies, Inc. All rights reserved.
5 * Copyright (c) 2005-2006 Intel Corporation. All rights reserved.
6 *
7 * This Software is licensed under one of the following licenses:
8 *
9 * 1) under the terms of the "Common Public License 1.0" a copy of which is
10 * available from the Open Source Initiative, see
11 * http://www.opensource.org/licenses/cpl.php.
12 *
13 * 2) under the terms of the "The BSD License" a copy of which is
14 * available from the Open Source Initiative, see
15 * http://www.opensource.org/licenses/bsd-license.php.
16 *
17 * 3) under the terms of the "GNU General Public License (GPL) Version 2" a
18 * copy of which is available from the Open Source Initiative, see
19 * http://www.opensource.org/licenses/gpl-license.php.
20 *
21 * Licensee has the right to choose one of the above licenses.
22 *
23 * Redistributions of source code must retain the above copyright
24 * notice and one of the license notices.
25 *
26 * Redistributions in binary form must reproduce both the above copyright
27 * notice, one of the license notices in the documentation
28 * and/or other materials provided with the distribution.
29 *
30 */
31
32 #include <linux/completion.h>
33 #include <linux/in.h>
34 #include <linux/in6.h>
35 #include <linux/mutex.h>
36 #include <linux/random.h>
37 #include <linux/idr.h>
38 #include <linux/inetdevice.h>
39
40 #include <net/tcp.h>
41
42 #include <rdma/rdma_cm.h>
43 #include <rdma/rdma_cm_ib.h>
44 #include <rdma/ib_cache.h>
45 #include <rdma/ib_cm.h>
46 #include <rdma/ib_sa.h>
47 #include <rdma/iw_cm.h>
48
49 MODULE_AUTHOR("Sean Hefty");
50 MODULE_DESCRIPTION("Generic RDMA CM Agent");
51 MODULE_LICENSE("Dual BSD/GPL");
52
53 #define CMA_CM_RESPONSE_TIMEOUT 20
54 #define CMA_MAX_CM_RETRIES 15
55
56 static void cma_add_one(struct ib_device *device);
57 static void cma_remove_one(struct ib_device *device);
58
59 static struct ib_client cma_client = {
60 .name = "cma",
61 .add = cma_add_one,
62 .remove = cma_remove_one
63 };
64
65 static struct ib_sa_client sa_client;
66 static struct rdma_addr_client addr_client;
67 static LIST_HEAD(dev_list);
68 static LIST_HEAD(listen_any_list);
69 static DEFINE_MUTEX(lock);
70 static struct workqueue_struct *cma_wq;
71 static DEFINE_IDR(sdp_ps);
72 static DEFINE_IDR(tcp_ps);
73
74 struct cma_device {
75 struct list_head list;
76 struct ib_device *device;
77 __be64 node_guid;
78 struct completion comp;
79 atomic_t refcount;
80 struct list_head id_list;
81 };
82
83 enum cma_state {
84 CMA_IDLE,
85 CMA_ADDR_QUERY,
86 CMA_ADDR_RESOLVED,
87 CMA_ROUTE_QUERY,
88 CMA_ROUTE_RESOLVED,
89 CMA_CONNECT,
90 CMA_DISCONNECT,
91 CMA_ADDR_BOUND,
92 CMA_LISTEN,
93 CMA_DEVICE_REMOVAL,
94 CMA_DESTROYING
95 };
96
97 struct rdma_bind_list {
98 struct idr *ps;
99 struct hlist_head owners;
100 unsigned short port;
101 };
102
103 /*
104 * Device removal can occur at anytime, so we need extra handling to
105 * serialize notifying the user of device removal with other callbacks.
106 * We do this by disabling removal notification while a callback is in process,
107 * and reporting it after the callback completes.
108 */
109 struct rdma_id_private {
110 struct rdma_cm_id id;
111
112 struct rdma_bind_list *bind_list;
113 struct hlist_node node;
114 struct list_head list;
115 struct list_head listen_list;
116 struct cma_device *cma_dev;
117
118 enum cma_state state;
119 spinlock_t lock;
120 struct completion comp;
121 atomic_t refcount;
122 wait_queue_head_t wait_remove;
123 atomic_t dev_remove;
124
125 int backlog;
126 int timeout_ms;
127 struct ib_sa_query *query;
128 int query_id;
129 union {
130 struct ib_cm_id *ib;
131 struct iw_cm_id *iw;
132 } cm_id;
133
134 u32 seq_num;
135 u32 qp_num;
136 enum ib_qp_type qp_type;
137 u8 srq;
138 };
139
140 struct cma_work {
141 struct work_struct work;
142 struct rdma_id_private *id;
143 enum cma_state old_state;
144 enum cma_state new_state;
145 struct rdma_cm_event event;
146 };
147
148 union cma_ip_addr {
149 struct in6_addr ip6;
150 struct {
151 __u32 pad[3];
152 __u32 addr;
153 } ip4;
154 };
155
156 struct cma_hdr {
157 u8 cma_version;
158 u8 ip_version; /* IP version: 7:4 */
159 __u16 port;
160 union cma_ip_addr src_addr;
161 union cma_ip_addr dst_addr;
162 };
163
164 struct sdp_hh {
165 u8 bsdh[16];
166 u8 sdp_version; /* Major version: 7:4 */
167 u8 ip_version; /* IP version: 7:4 */
168 u8 sdp_specific1[10];
169 __u16 port;
170 __u16 sdp_specific2;
171 union cma_ip_addr src_addr;
172 union cma_ip_addr dst_addr;
173 };
174
175 struct sdp_hah {
176 u8 bsdh[16];
177 u8 sdp_version;
178 };
179
180 #define CMA_VERSION 0x00
181 #define SDP_MAJ_VERSION 0x2
182
183 static int cma_comp(struct rdma_id_private *id_priv, enum cma_state comp)
184 {
185 unsigned long flags;
186 int ret;
187
188 spin_lock_irqsave(&id_priv->lock, flags);
189 ret = (id_priv->state == comp);
190 spin_unlock_irqrestore(&id_priv->lock, flags);
191 return ret;
192 }
193
194 static int cma_comp_exch(struct rdma_id_private *id_priv,
195 enum cma_state comp, enum cma_state exch)
196 {
197 unsigned long flags;
198 int ret;
199
200 spin_lock_irqsave(&id_priv->lock, flags);
201 if ((ret = (id_priv->state == comp)))
202 id_priv->state = exch;
203 spin_unlock_irqrestore(&id_priv->lock, flags);
204 return ret;
205 }
206
207 static enum cma_state cma_exch(struct rdma_id_private *id_priv,
208 enum cma_state exch)
209 {
210 unsigned long flags;
211 enum cma_state old;
212
213 spin_lock_irqsave(&id_priv->lock, flags);
214 old = id_priv->state;
215 id_priv->state = exch;
216 spin_unlock_irqrestore(&id_priv->lock, flags);
217 return old;
218 }
219
220 static inline u8 cma_get_ip_ver(struct cma_hdr *hdr)
221 {
222 return hdr->ip_version >> 4;
223 }
224
225 static inline void cma_set_ip_ver(struct cma_hdr *hdr, u8 ip_ver)
226 {
227 hdr->ip_version = (ip_ver << 4) | (hdr->ip_version & 0xF);
228 }
229
230 static inline u8 sdp_get_majv(u8 sdp_version)
231 {
232 return sdp_version >> 4;
233 }
234
235 static inline u8 sdp_get_ip_ver(struct sdp_hh *hh)
236 {
237 return hh->ip_version >> 4;
238 }
239
240 static inline void sdp_set_ip_ver(struct sdp_hh *hh, u8 ip_ver)
241 {
242 hh->ip_version = (ip_ver << 4) | (hh->ip_version & 0xF);
243 }
244
245 static void cma_attach_to_dev(struct rdma_id_private *id_priv,
246 struct cma_device *cma_dev)
247 {
248 atomic_inc(&cma_dev->refcount);
249 id_priv->cma_dev = cma_dev;
250 id_priv->id.device = cma_dev->device;
251 list_add_tail(&id_priv->list, &cma_dev->id_list);
252 }
253
254 static inline void cma_deref_dev(struct cma_device *cma_dev)
255 {
256 if (atomic_dec_and_test(&cma_dev->refcount))
257 complete(&cma_dev->comp);
258 }
259
260 static void cma_detach_from_dev(struct rdma_id_private *id_priv)
261 {
262 list_del(&id_priv->list);
263 cma_deref_dev(id_priv->cma_dev);
264 id_priv->cma_dev = NULL;
265 }
266
267 static int cma_acquire_dev(struct rdma_id_private *id_priv)
268 {
269 enum rdma_node_type dev_type = id_priv->id.route.addr.dev_addr.dev_type;
270 struct cma_device *cma_dev;
271 union ib_gid gid;
272 int ret = -ENODEV;
273
274 switch (rdma_node_get_transport(dev_type)) {
275 case RDMA_TRANSPORT_IB:
276 ib_addr_get_sgid(&id_priv->id.route.addr.dev_addr, &gid);
277 break;
278 case RDMA_TRANSPORT_IWARP:
279 iw_addr_get_sgid(&id_priv->id.route.addr.dev_addr, &gid);
280 break;
281 default:
282 return -ENODEV;
283 }
284
285 list_for_each_entry(cma_dev, &dev_list, list) {
286 ret = ib_find_cached_gid(cma_dev->device, &gid,
287 &id_priv->id.port_num, NULL);
288 if (!ret) {
289 cma_attach_to_dev(id_priv, cma_dev);
290 break;
291 }
292 }
293 return ret;
294 }
295
296 static void cma_deref_id(struct rdma_id_private *id_priv)
297 {
298 if (atomic_dec_and_test(&id_priv->refcount))
299 complete(&id_priv->comp);
300 }
301
302 static void cma_release_remove(struct rdma_id_private *id_priv)
303 {
304 if (atomic_dec_and_test(&id_priv->dev_remove))
305 wake_up(&id_priv->wait_remove);
306 }
307
308 struct rdma_cm_id *rdma_create_id(rdma_cm_event_handler event_handler,
309 void *context, enum rdma_port_space ps)
310 {
311 struct rdma_id_private *id_priv;
312
313 id_priv = kzalloc(sizeof *id_priv, GFP_KERNEL);
314 if (!id_priv)
315 return ERR_PTR(-ENOMEM);
316
317 id_priv->state = CMA_IDLE;
318 id_priv->id.context = context;
319 id_priv->id.event_handler = event_handler;
320 id_priv->id.ps = ps;
321 spin_lock_init(&id_priv->lock);
322 init_completion(&id_priv->comp);
323 atomic_set(&id_priv->refcount, 1);
324 init_waitqueue_head(&id_priv->wait_remove);
325 atomic_set(&id_priv->dev_remove, 0);
326 INIT_LIST_HEAD(&id_priv->listen_list);
327 get_random_bytes(&id_priv->seq_num, sizeof id_priv->seq_num);
328
329 return &id_priv->id;
330 }
331 EXPORT_SYMBOL(rdma_create_id);
332
333 static int cma_init_ib_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
334 {
335 struct ib_qp_attr qp_attr;
336 struct rdma_dev_addr *dev_addr;
337 int ret;
338
339 dev_addr = &id_priv->id.route.addr.dev_addr;
340 ret = ib_find_cached_pkey(id_priv->id.device, id_priv->id.port_num,
341 ib_addr_get_pkey(dev_addr),
342 &qp_attr.pkey_index);
343 if (ret)
344 return ret;
345
346 qp_attr.qp_state = IB_QPS_INIT;
347 qp_attr.qp_access_flags = 0;
348 qp_attr.port_num = id_priv->id.port_num;
349 return ib_modify_qp(qp, &qp_attr, IB_QP_STATE | IB_QP_ACCESS_FLAGS |
350 IB_QP_PKEY_INDEX | IB_QP_PORT);
351 }
352
353 static int cma_init_iw_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
354 {
355 struct ib_qp_attr qp_attr;
356
357 qp_attr.qp_state = IB_QPS_INIT;
358 qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE;
359
360 return ib_modify_qp(qp, &qp_attr, IB_QP_STATE | IB_QP_ACCESS_FLAGS);
361 }
362
363 int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd,
364 struct ib_qp_init_attr *qp_init_attr)
365 {
366 struct rdma_id_private *id_priv;
367 struct ib_qp *qp;
368 int ret;
369
370 id_priv = container_of(id, struct rdma_id_private, id);
371 if (id->device != pd->device)
372 return -EINVAL;
373
374 qp = ib_create_qp(pd, qp_init_attr);
375 if (IS_ERR(qp))
376 return PTR_ERR(qp);
377
378 switch (rdma_node_get_transport(id->device->node_type)) {
379 case RDMA_TRANSPORT_IB:
380 ret = cma_init_ib_qp(id_priv, qp);
381 break;
382 case RDMA_TRANSPORT_IWARP:
383 ret = cma_init_iw_qp(id_priv, qp);
384 break;
385 default:
386 ret = -ENOSYS;
387 break;
388 }
389
390 if (ret)
391 goto err;
392
393 id->qp = qp;
394 id_priv->qp_num = qp->qp_num;
395 id_priv->qp_type = qp->qp_type;
396 id_priv->srq = (qp->srq != NULL);
397 return 0;
398 err:
399 ib_destroy_qp(qp);
400 return ret;
401 }
402 EXPORT_SYMBOL(rdma_create_qp);
403
404 void rdma_destroy_qp(struct rdma_cm_id *id)
405 {
406 ib_destroy_qp(id->qp);
407 }
408 EXPORT_SYMBOL(rdma_destroy_qp);
409
410 static int cma_modify_qp_rtr(struct rdma_cm_id *id)
411 {
412 struct ib_qp_attr qp_attr;
413 int qp_attr_mask, ret;
414
415 if (!id->qp)
416 return 0;
417
418 /* Need to update QP attributes from default values. */
419 qp_attr.qp_state = IB_QPS_INIT;
420 ret = rdma_init_qp_attr(id, &qp_attr, &qp_attr_mask);
421 if (ret)
422 return ret;
423
424 ret = ib_modify_qp(id->qp, &qp_attr, qp_attr_mask);
425 if (ret)
426 return ret;
427
428 qp_attr.qp_state = IB_QPS_RTR;
429 ret = rdma_init_qp_attr(id, &qp_attr, &qp_attr_mask);
430 if (ret)
431 return ret;
432
433 return ib_modify_qp(id->qp, &qp_attr, qp_attr_mask);
434 }
435
436 static int cma_modify_qp_rts(struct rdma_cm_id *id)
437 {
438 struct ib_qp_attr qp_attr;
439 int qp_attr_mask, ret;
440
441 if (!id->qp)
442 return 0;
443
444 qp_attr.qp_state = IB_QPS_RTS;
445 ret = rdma_init_qp_attr(id, &qp_attr, &qp_attr_mask);
446 if (ret)
447 return ret;
448
449 return ib_modify_qp(id->qp, &qp_attr, qp_attr_mask);
450 }
451
452 static int cma_modify_qp_err(struct rdma_cm_id *id)
453 {
454 struct ib_qp_attr qp_attr;
455
456 if (!id->qp)
457 return 0;
458
459 qp_attr.qp_state = IB_QPS_ERR;
460 return ib_modify_qp(id->qp, &qp_attr, IB_QP_STATE);
461 }
462
463 int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
464 int *qp_attr_mask)
465 {
466 struct rdma_id_private *id_priv;
467 int ret;
468
469 id_priv = container_of(id, struct rdma_id_private, id);
470 switch (rdma_node_get_transport(id_priv->id.device->node_type)) {
471 case RDMA_TRANSPORT_IB:
472 ret = ib_cm_init_qp_attr(id_priv->cm_id.ib, qp_attr,
473 qp_attr_mask);
474 if (qp_attr->qp_state == IB_QPS_RTR)
475 qp_attr->rq_psn = id_priv->seq_num;
476 break;
477 case RDMA_TRANSPORT_IWARP:
478 ret = iw_cm_init_qp_attr(id_priv->cm_id.iw, qp_attr,
479 qp_attr_mask);
480 break;
481 default:
482 ret = -ENOSYS;
483 break;
484 }
485
486 return ret;
487 }
488 EXPORT_SYMBOL(rdma_init_qp_attr);
489
490 static inline int cma_zero_addr(struct sockaddr *addr)
491 {
492 struct in6_addr *ip6;
493
494 if (addr->sa_family == AF_INET)
495 return ZERONET(((struct sockaddr_in *) addr)->sin_addr.s_addr);
496 else {
497 ip6 = &((struct sockaddr_in6 *) addr)->sin6_addr;
498 return (ip6->s6_addr32[0] | ip6->s6_addr32[1] |
499 ip6->s6_addr32[2] | ip6->s6_addr32[3]) == 0;
500 }
501 }
502
503 static inline int cma_loopback_addr(struct sockaddr *addr)
504 {
505 return LOOPBACK(((struct sockaddr_in *) addr)->sin_addr.s_addr);
506 }
507
508 static inline int cma_any_addr(struct sockaddr *addr)
509 {
510 return cma_zero_addr(addr) || cma_loopback_addr(addr);
511 }
512
513 static inline int cma_any_port(struct sockaddr *addr)
514 {
515 return !((struct sockaddr_in *) addr)->sin_port;
516 }
517
518 static int cma_get_net_info(void *hdr, enum rdma_port_space ps,
519 u8 *ip_ver, __u16 *port,
520 union cma_ip_addr **src, union cma_ip_addr **dst)
521 {
522 switch (ps) {
523 case RDMA_PS_SDP:
524 if (sdp_get_majv(((struct sdp_hh *) hdr)->sdp_version) !=
525 SDP_MAJ_VERSION)
526 return -EINVAL;
527
528 *ip_ver = sdp_get_ip_ver(hdr);
529 *port = ((struct sdp_hh *) hdr)->port;
530 *src = &((struct sdp_hh *) hdr)->src_addr;
531 *dst = &((struct sdp_hh *) hdr)->dst_addr;
532 break;
533 default:
534 if (((struct cma_hdr *) hdr)->cma_version != CMA_VERSION)
535 return -EINVAL;
536
537 *ip_ver = cma_get_ip_ver(hdr);
538 *port = ((struct cma_hdr *) hdr)->port;
539 *src = &((struct cma_hdr *) hdr)->src_addr;
540 *dst = &((struct cma_hdr *) hdr)->dst_addr;
541 break;
542 }
543
544 if (*ip_ver != 4 && *ip_ver != 6)
545 return -EINVAL;
546 return 0;
547 }
548
549 static void cma_save_net_info(struct rdma_addr *addr,
550 struct rdma_addr *listen_addr,
551 u8 ip_ver, __u16 port,
552 union cma_ip_addr *src, union cma_ip_addr *dst)
553 {
554 struct sockaddr_in *listen4, *ip4;
555 struct sockaddr_in6 *listen6, *ip6;
556
557 switch (ip_ver) {
558 case 4:
559 listen4 = (struct sockaddr_in *) &listen_addr->src_addr;
560 ip4 = (struct sockaddr_in *) &addr->src_addr;
561 ip4->sin_family = listen4->sin_family;
562 ip4->sin_addr.s_addr = dst->ip4.addr;
563 ip4->sin_port = listen4->sin_port;
564
565 ip4 = (struct sockaddr_in *) &addr->dst_addr;
566 ip4->sin_family = listen4->sin_family;
567 ip4->sin_addr.s_addr = src->ip4.addr;
568 ip4->sin_port = port;
569 break;
570 case 6:
571 listen6 = (struct sockaddr_in6 *) &listen_addr->src_addr;
572 ip6 = (struct sockaddr_in6 *) &addr->src_addr;
573 ip6->sin6_family = listen6->sin6_family;
574 ip6->sin6_addr = dst->ip6;
575 ip6->sin6_port = listen6->sin6_port;
576
577 ip6 = (struct sockaddr_in6 *) &addr->dst_addr;
578 ip6->sin6_family = listen6->sin6_family;
579 ip6->sin6_addr = src->ip6;
580 ip6->sin6_port = port;
581 break;
582 default:
583 break;
584 }
585 }
586
587 static inline int cma_user_data_offset(enum rdma_port_space ps)
588 {
589 switch (ps) {
590 case RDMA_PS_SDP:
591 return 0;
592 default:
593 return sizeof(struct cma_hdr);
594 }
595 }
596
597 static int cma_notify_user(struct rdma_id_private *id_priv,
598 enum rdma_cm_event_type type, int status,
599 void *data, u8 data_len)
600 {
601 struct rdma_cm_event event;
602
603 event.event = type;
604 event.status = status;
605 event.private_data = data;
606 event.private_data_len = data_len;
607
608 return id_priv->id.event_handler(&id_priv->id, &event);
609 }
610
611 static void cma_cancel_route(struct rdma_id_private *id_priv)
612 {
613 switch (rdma_node_get_transport(id_priv->id.device->node_type)) {
614 case RDMA_TRANSPORT_IB:
615 if (id_priv->query)
616 ib_sa_cancel_query(id_priv->query_id, id_priv->query);
617 break;
618 default:
619 break;
620 }
621 }
622
623 static inline int cma_internal_listen(struct rdma_id_private *id_priv)
624 {
625 return (id_priv->state == CMA_LISTEN) && id_priv->cma_dev &&
626 cma_any_addr(&id_priv->id.route.addr.src_addr);
627 }
628
629 static void cma_destroy_listen(struct rdma_id_private *id_priv)
630 {
631 cma_exch(id_priv, CMA_DESTROYING);
632
633 if (id_priv->cma_dev) {
634 switch (rdma_node_get_transport(id_priv->id.device->node_type)) {
635 case RDMA_TRANSPORT_IB:
636 if (id_priv->cm_id.ib && !IS_ERR(id_priv->cm_id.ib))
637 ib_destroy_cm_id(id_priv->cm_id.ib);
638 break;
639 case RDMA_TRANSPORT_IWARP:
640 if (id_priv->cm_id.iw && !IS_ERR(id_priv->cm_id.iw))
641 iw_destroy_cm_id(id_priv->cm_id.iw);
642 break;
643 default:
644 break;
645 }
646 cma_detach_from_dev(id_priv);
647 }
648 list_del(&id_priv->listen_list);
649
650 cma_deref_id(id_priv);
651 wait_for_completion(&id_priv->comp);
652
653 kfree(id_priv);
654 }
655
656 static void cma_cancel_listens(struct rdma_id_private *id_priv)
657 {
658 struct rdma_id_private *dev_id_priv;
659
660 mutex_lock(&lock);
661 list_del(&id_priv->list);
662
663 while (!list_empty(&id_priv->listen_list)) {
664 dev_id_priv = list_entry(id_priv->listen_list.next,
665 struct rdma_id_private, listen_list);
666 cma_destroy_listen(dev_id_priv);
667 }
668 mutex_unlock(&lock);
669 }
670
671 static void cma_cancel_operation(struct rdma_id_private *id_priv,
672 enum cma_state state)
673 {
674 switch (state) {
675 case CMA_ADDR_QUERY:
676 rdma_addr_cancel(&id_priv->id.route.addr.dev_addr);
677 break;
678 case CMA_ROUTE_QUERY:
679 cma_cancel_route(id_priv);
680 break;
681 case CMA_LISTEN:
682 if (cma_any_addr(&id_priv->id.route.addr.src_addr) &&
683 !id_priv->cma_dev)
684 cma_cancel_listens(id_priv);
685 break;
686 default:
687 break;
688 }
689 }
690
691 static void cma_release_port(struct rdma_id_private *id_priv)
692 {
693 struct rdma_bind_list *bind_list = id_priv->bind_list;
694
695 if (!bind_list)
696 return;
697
698 mutex_lock(&lock);
699 hlist_del(&id_priv->node);
700 if (hlist_empty(&bind_list->owners)) {
701 idr_remove(bind_list->ps, bind_list->port);
702 kfree(bind_list);
703 }
704 mutex_unlock(&lock);
705 }
706
707 void rdma_destroy_id(struct rdma_cm_id *id)
708 {
709 struct rdma_id_private *id_priv;
710 enum cma_state state;
711
712 id_priv = container_of(id, struct rdma_id_private, id);
713 state = cma_exch(id_priv, CMA_DESTROYING);
714 cma_cancel_operation(id_priv, state);
715
716 mutex_lock(&lock);
717 if (id_priv->cma_dev) {
718 mutex_unlock(&lock);
719 switch (rdma_node_get_transport(id->device->node_type)) {
720 case RDMA_TRANSPORT_IB:
721 if (id_priv->cm_id.ib && !IS_ERR(id_priv->cm_id.ib))
722 ib_destroy_cm_id(id_priv->cm_id.ib);
723 break;
724 case RDMA_TRANSPORT_IWARP:
725 if (id_priv->cm_id.iw && !IS_ERR(id_priv->cm_id.iw))
726 iw_destroy_cm_id(id_priv->cm_id.iw);
727 break;
728 default:
729 break;
730 }
731 mutex_lock(&lock);
732 cma_detach_from_dev(id_priv);
733 }
734 mutex_unlock(&lock);
735
736 cma_release_port(id_priv);
737 cma_deref_id(id_priv);
738 wait_for_completion(&id_priv->comp);
739
740 kfree(id_priv->id.route.path_rec);
741 kfree(id_priv);
742 }
743 EXPORT_SYMBOL(rdma_destroy_id);
744
745 static int cma_rep_recv(struct rdma_id_private *id_priv)
746 {
747 int ret;
748
749 ret = cma_modify_qp_rtr(&id_priv->id);
750 if (ret)
751 goto reject;
752
753 ret = cma_modify_qp_rts(&id_priv->id);
754 if (ret)
755 goto reject;
756
757 ret = ib_send_cm_rtu(id_priv->cm_id.ib, NULL, 0);
758 if (ret)
759 goto reject;
760
761 return 0;
762 reject:
763 cma_modify_qp_err(&id_priv->id);
764 ib_send_cm_rej(id_priv->cm_id.ib, IB_CM_REJ_CONSUMER_DEFINED,
765 NULL, 0, NULL, 0);
766 return ret;
767 }
768
769 static int cma_verify_rep(struct rdma_id_private *id_priv, void *data)
770 {
771 if (id_priv->id.ps == RDMA_PS_SDP &&
772 sdp_get_majv(((struct sdp_hah *) data)->sdp_version) !=
773 SDP_MAJ_VERSION)
774 return -EINVAL;
775
776 return 0;
777 }
778
779 static int cma_rtu_recv(struct rdma_id_private *id_priv)
780 {
781 int ret;
782
783 ret = cma_modify_qp_rts(&id_priv->id);
784 if (ret)
785 goto reject;
786
787 return 0;
788 reject:
789 cma_modify_qp_err(&id_priv->id);
790 ib_send_cm_rej(id_priv->cm_id.ib, IB_CM_REJ_CONSUMER_DEFINED,
791 NULL, 0, NULL, 0);
792 return ret;
793 }
794
795 static int cma_ib_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
796 {
797 struct rdma_id_private *id_priv = cm_id->context;
798 enum rdma_cm_event_type event;
799 u8 private_data_len = 0;
800 int ret = 0, status = 0;
801
802 atomic_inc(&id_priv->dev_remove);
803 if (!cma_comp(id_priv, CMA_CONNECT))
804 goto out;
805
806 switch (ib_event->event) {
807 case IB_CM_REQ_ERROR:
808 case IB_CM_REP_ERROR:
809 event = RDMA_CM_EVENT_UNREACHABLE;
810 status = -ETIMEDOUT;
811 break;
812 case IB_CM_REP_RECEIVED:
813 status = cma_verify_rep(id_priv, ib_event->private_data);
814 if (status)
815 event = RDMA_CM_EVENT_CONNECT_ERROR;
816 else if (id_priv->id.qp && id_priv->id.ps != RDMA_PS_SDP) {
817 status = cma_rep_recv(id_priv);
818 event = status ? RDMA_CM_EVENT_CONNECT_ERROR :
819 RDMA_CM_EVENT_ESTABLISHED;
820 } else
821 event = RDMA_CM_EVENT_CONNECT_RESPONSE;
822 private_data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
823 break;
824 case IB_CM_RTU_RECEIVED:
825 status = cma_rtu_recv(id_priv);
826 event = status ? RDMA_CM_EVENT_CONNECT_ERROR :
827 RDMA_CM_EVENT_ESTABLISHED;
828 break;
829 case IB_CM_DREQ_ERROR:
830 status = -ETIMEDOUT; /* fall through */
831 case IB_CM_DREQ_RECEIVED:
832 case IB_CM_DREP_RECEIVED:
833 if (!cma_comp_exch(id_priv, CMA_CONNECT, CMA_DISCONNECT))
834 goto out;
835 event = RDMA_CM_EVENT_DISCONNECTED;
836 break;
837 case IB_CM_TIMEWAIT_EXIT:
838 case IB_CM_MRA_RECEIVED:
839 /* ignore event */
840 goto out;
841 case IB_CM_REJ_RECEIVED:
842 cma_modify_qp_err(&id_priv->id);
843 status = ib_event->param.rej_rcvd.reason;
844 event = RDMA_CM_EVENT_REJECTED;
845 private_data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
846 break;
847 default:
848 printk(KERN_ERR "RDMA CMA: unexpected IB CM event: %d",
849 ib_event->event);
850 goto out;
851 }
852
853 ret = cma_notify_user(id_priv, event, status, ib_event->private_data,
854 private_data_len);
855 if (ret) {
856 /* Destroy the CM ID by returning a non-zero value. */
857 id_priv->cm_id.ib = NULL;
858 cma_exch(id_priv, CMA_DESTROYING);
859 cma_release_remove(id_priv);
860 rdma_destroy_id(&id_priv->id);
861 return ret;
862 }
863 out:
864 cma_release_remove(id_priv);
865 return ret;
866 }
867
868 static struct rdma_id_private *cma_new_id(struct rdma_cm_id *listen_id,
869 struct ib_cm_event *ib_event)
870 {
871 struct rdma_id_private *id_priv;
872 struct rdma_cm_id *id;
873 struct rdma_route *rt;
874 union cma_ip_addr *src, *dst;
875 __u16 port;
876 u8 ip_ver;
877
878 if (cma_get_net_info(ib_event->private_data, listen_id->ps,
879 &ip_ver, &port, &src, &dst))
880 goto err;
881
882 id = rdma_create_id(listen_id->event_handler, listen_id->context,
883 listen_id->ps);
884 if (IS_ERR(id))
885 goto err;
886
887 cma_save_net_info(&id->route.addr, &listen_id->route.addr,
888 ip_ver, port, src, dst);
889
890 rt = &id->route;
891 rt->num_paths = ib_event->param.req_rcvd.alternate_path ? 2 : 1;
892 rt->path_rec = kmalloc(sizeof *rt->path_rec * rt->num_paths,
893 GFP_KERNEL);
894 if (!rt->path_rec)
895 goto destroy_id;
896
897 rt->path_rec[0] = *ib_event->param.req_rcvd.primary_path;
898 if (rt->num_paths == 2)
899 rt->path_rec[1] = *ib_event->param.req_rcvd.alternate_path;
900
901 ib_addr_set_sgid(&rt->addr.dev_addr, &rt->path_rec[0].sgid);
902 ib_addr_set_dgid(&rt->addr.dev_addr, &rt->path_rec[0].dgid);
903 ib_addr_set_pkey(&rt->addr.dev_addr, be16_to_cpu(rt->path_rec[0].pkey));
904 rt->addr.dev_addr.dev_type = RDMA_NODE_IB_CA;
905
906 id_priv = container_of(id, struct rdma_id_private, id);
907 id_priv->state = CMA_CONNECT;
908 return id_priv;
909
910 destroy_id:
911 rdma_destroy_id(id);
912 err:
913 return NULL;
914 }
915
916 static int cma_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
917 {
918 struct rdma_id_private *listen_id, *conn_id;
919 int offset, ret;
920
921 listen_id = cm_id->context;
922 atomic_inc(&listen_id->dev_remove);
923 if (!cma_comp(listen_id, CMA_LISTEN)) {
924 ret = -ECONNABORTED;
925 goto out;
926 }
927
928 conn_id = cma_new_id(&listen_id->id, ib_event);
929 if (!conn_id) {
930 ret = -ENOMEM;
931 goto out;
932 }
933
934 atomic_inc(&conn_id->dev_remove);
935 mutex_lock(&lock);
936 ret = cma_acquire_dev(conn_id);
937 mutex_unlock(&lock);
938 if (ret)
939 goto release_conn_id;
940
941 conn_id->cm_id.ib = cm_id;
942 cm_id->context = conn_id;
943 cm_id->cm_handler = cma_ib_handler;
944
945 offset = cma_user_data_offset(listen_id->id.ps);
946 ret = cma_notify_user(conn_id, RDMA_CM_EVENT_CONNECT_REQUEST, 0,
947 ib_event->private_data + offset,
948 IB_CM_REQ_PRIVATE_DATA_SIZE - offset);
949 if (!ret)
950 goto out;
951
952 /* Destroy the CM ID by returning a non-zero value. */
953 conn_id->cm_id.ib = NULL;
954
955 release_conn_id:
956 cma_exch(conn_id, CMA_DESTROYING);
957 cma_release_remove(conn_id);
958 rdma_destroy_id(&conn_id->id);
959
960 out:
961 cma_release_remove(listen_id);
962 return ret;
963 }
964
965 static __be64 cma_get_service_id(enum rdma_port_space ps, struct sockaddr *addr)
966 {
967 return cpu_to_be64(((u64)ps << 16) +
968 be16_to_cpu(((struct sockaddr_in *) addr)->sin_port));
969 }
970
971 static void cma_set_compare_data(enum rdma_port_space ps, struct sockaddr *addr,
972 struct ib_cm_compare_data *compare)
973 {
974 struct cma_hdr *cma_data, *cma_mask;
975 struct sdp_hh *sdp_data, *sdp_mask;
976 __u32 ip4_addr;
977 struct in6_addr ip6_addr;
978
979 memset(compare, 0, sizeof *compare);
980 cma_data = (void *) compare->data;
981 cma_mask = (void *) compare->mask;
982 sdp_data = (void *) compare->data;
983 sdp_mask = (void *) compare->mask;
984
985 switch (addr->sa_family) {
986 case AF_INET:
987 ip4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
988 if (ps == RDMA_PS_SDP) {
989 sdp_set_ip_ver(sdp_data, 4);
990 sdp_set_ip_ver(sdp_mask, 0xF);
991 sdp_data->dst_addr.ip4.addr = ip4_addr;
992 sdp_mask->dst_addr.ip4.addr = ~0;
993 } else {
994 cma_set_ip_ver(cma_data, 4);
995 cma_set_ip_ver(cma_mask, 0xF);
996 cma_data->dst_addr.ip4.addr = ip4_addr;
997 cma_mask->dst_addr.ip4.addr = ~0;
998 }
999 break;
1000 case AF_INET6:
1001 ip6_addr = ((struct sockaddr_in6 *) addr)->sin6_addr;
1002 if (ps == RDMA_PS_SDP) {
1003 sdp_set_ip_ver(sdp_data, 6);
1004 sdp_set_ip_ver(sdp_mask, 0xF);
1005 sdp_data->dst_addr.ip6 = ip6_addr;
1006 memset(&sdp_mask->dst_addr.ip6, 0xFF,
1007 sizeof sdp_mask->dst_addr.ip6);
1008 } else {
1009 cma_set_ip_ver(cma_data, 6);
1010 cma_set_ip_ver(cma_mask, 0xF);
1011 cma_data->dst_addr.ip6 = ip6_addr;
1012 memset(&cma_mask->dst_addr.ip6, 0xFF,
1013 sizeof cma_mask->dst_addr.ip6);
1014 }
1015 break;
1016 default:
1017 break;
1018 }
1019 }
1020
1021 static int cma_iw_handler(struct iw_cm_id *iw_id, struct iw_cm_event *iw_event)
1022 {
1023 struct rdma_id_private *id_priv = iw_id->context;
1024 enum rdma_cm_event_type event = 0;
1025 struct sockaddr_in *sin;
1026 int ret = 0;
1027
1028 atomic_inc(&id_priv->dev_remove);
1029
1030 switch (iw_event->event) {
1031 case IW_CM_EVENT_CLOSE:
1032 event = RDMA_CM_EVENT_DISCONNECTED;
1033 break;
1034 case IW_CM_EVENT_CONNECT_REPLY:
1035 sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
1036 *sin = iw_event->local_addr;
1037 sin = (struct sockaddr_in *) &id_priv->id.route.addr.dst_addr;
1038 *sin = iw_event->remote_addr;
1039 if (iw_event->status)
1040 event = RDMA_CM_EVENT_REJECTED;
1041 else
1042 event = RDMA_CM_EVENT_ESTABLISHED;
1043 break;
1044 case IW_CM_EVENT_ESTABLISHED:
1045 event = RDMA_CM_EVENT_ESTABLISHED;
1046 break;
1047 default:
1048 BUG_ON(1);
1049 }
1050
1051 ret = cma_notify_user(id_priv, event, iw_event->status,
1052 iw_event->private_data,
1053 iw_event->private_data_len);
1054 if (ret) {
1055 /* Destroy the CM ID by returning a non-zero value. */
1056 id_priv->cm_id.iw = NULL;
1057 cma_exch(id_priv, CMA_DESTROYING);
1058 cma_release_remove(id_priv);
1059 rdma_destroy_id(&id_priv->id);
1060 return ret;
1061 }
1062
1063 cma_release_remove(id_priv);
1064 return ret;
1065 }
1066
1067 static int iw_conn_req_handler(struct iw_cm_id *cm_id,
1068 struct iw_cm_event *iw_event)
1069 {
1070 struct rdma_cm_id *new_cm_id;
1071 struct rdma_id_private *listen_id, *conn_id;
1072 struct sockaddr_in *sin;
1073 struct net_device *dev = NULL;
1074 int ret;
1075
1076 listen_id = cm_id->context;
1077 atomic_inc(&listen_id->dev_remove);
1078 if (!cma_comp(listen_id, CMA_LISTEN)) {
1079 ret = -ECONNABORTED;
1080 goto out;
1081 }
1082
1083 /* Create a new RDMA id for the new IW CM ID */
1084 new_cm_id = rdma_create_id(listen_id->id.event_handler,
1085 listen_id->id.context,
1086 RDMA_PS_TCP);
1087 if (!new_cm_id) {
1088 ret = -ENOMEM;
1089 goto out;
1090 }
1091 conn_id = container_of(new_cm_id, struct rdma_id_private, id);
1092 atomic_inc(&conn_id->dev_remove);
1093 conn_id->state = CMA_CONNECT;
1094
1095 dev = ip_dev_find(iw_event->local_addr.sin_addr.s_addr);
1096 if (!dev) {
1097 ret = -EADDRNOTAVAIL;
1098 cma_release_remove(conn_id);
1099 rdma_destroy_id(new_cm_id);
1100 goto out;
1101 }
1102 ret = rdma_copy_addr(&conn_id->id.route.addr.dev_addr, dev, NULL);
1103 if (ret) {
1104 cma_release_remove(conn_id);
1105 rdma_destroy_id(new_cm_id);
1106 goto out;
1107 }
1108
1109 mutex_lock(&lock);
1110 ret = cma_acquire_dev(conn_id);
1111 mutex_unlock(&lock);
1112 if (ret) {
1113 cma_release_remove(conn_id);
1114 rdma_destroy_id(new_cm_id);
1115 goto out;
1116 }
1117
1118 conn_id->cm_id.iw = cm_id;
1119 cm_id->context = conn_id;
1120 cm_id->cm_handler = cma_iw_handler;
1121
1122 sin = (struct sockaddr_in *) &new_cm_id->route.addr.src_addr;
1123 *sin = iw_event->local_addr;
1124 sin = (struct sockaddr_in *) &new_cm_id->route.addr.dst_addr;
1125 *sin = iw_event->remote_addr;
1126
1127 ret = cma_notify_user(conn_id, RDMA_CM_EVENT_CONNECT_REQUEST, 0,
1128 iw_event->private_data,
1129 iw_event->private_data_len);
1130 if (ret) {
1131 /* User wants to destroy the CM ID */
1132 conn_id->cm_id.iw = NULL;
1133 cma_exch(conn_id, CMA_DESTROYING);
1134 cma_release_remove(conn_id);
1135 rdma_destroy_id(&conn_id->id);
1136 }
1137
1138 out:
1139 if (dev)
1140 dev_put(dev);
1141 cma_release_remove(listen_id);
1142 return ret;
1143 }
1144
1145 static int cma_ib_listen(struct rdma_id_private *id_priv)
1146 {
1147 struct ib_cm_compare_data compare_data;
1148 struct sockaddr *addr;
1149 __be64 svc_id;
1150 int ret;
1151
1152 id_priv->cm_id.ib = ib_create_cm_id(id_priv->id.device, cma_req_handler,
1153 id_priv);
1154 if (IS_ERR(id_priv->cm_id.ib))
1155 return PTR_ERR(id_priv->cm_id.ib);
1156
1157 addr = &id_priv->id.route.addr.src_addr;
1158 svc_id = cma_get_service_id(id_priv->id.ps, addr);
1159 if (cma_any_addr(addr))
1160 ret = ib_cm_listen(id_priv->cm_id.ib, svc_id, 0, NULL);
1161 else {
1162 cma_set_compare_data(id_priv->id.ps, addr, &compare_data);
1163 ret = ib_cm_listen(id_priv->cm_id.ib, svc_id, 0, &compare_data);
1164 }
1165
1166 if (ret) {
1167 ib_destroy_cm_id(id_priv->cm_id.ib);
1168 id_priv->cm_id.ib = NULL;
1169 }
1170
1171 return ret;
1172 }
1173
1174 static int cma_iw_listen(struct rdma_id_private *id_priv, int backlog)
1175 {
1176 int ret;
1177 struct sockaddr_in *sin;
1178
1179 id_priv->cm_id.iw = iw_create_cm_id(id_priv->id.device,
1180 iw_conn_req_handler,
1181 id_priv);
1182 if (IS_ERR(id_priv->cm_id.iw))
1183 return PTR_ERR(id_priv->cm_id.iw);
1184
1185 sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
1186 id_priv->cm_id.iw->local_addr = *sin;
1187
1188 ret = iw_cm_listen(id_priv->cm_id.iw, backlog);
1189
1190 if (ret) {
1191 iw_destroy_cm_id(id_priv->cm_id.iw);
1192 id_priv->cm_id.iw = NULL;
1193 }
1194
1195 return ret;
1196 }
1197
1198 static int cma_listen_handler(struct rdma_cm_id *id,
1199 struct rdma_cm_event *event)
1200 {
1201 struct rdma_id_private *id_priv = id->context;
1202
1203 id->context = id_priv->id.context;
1204 id->event_handler = id_priv->id.event_handler;
1205 return id_priv->id.event_handler(id, event);
1206 }
1207
1208 static void cma_listen_on_dev(struct rdma_id_private *id_priv,
1209 struct cma_device *cma_dev)
1210 {
1211 struct rdma_id_private *dev_id_priv;
1212 struct rdma_cm_id *id;
1213 int ret;
1214
1215 id = rdma_create_id(cma_listen_handler, id_priv, id_priv->id.ps);
1216 if (IS_ERR(id))
1217 return;
1218
1219 dev_id_priv = container_of(id, struct rdma_id_private, id);
1220
1221 dev_id_priv->state = CMA_ADDR_BOUND;
1222 memcpy(&id->route.addr.src_addr, &id_priv->id.route.addr.src_addr,
1223 ip_addr_size(&id_priv->id.route.addr.src_addr));
1224
1225 cma_attach_to_dev(dev_id_priv, cma_dev);
1226 list_add_tail(&dev_id_priv->listen_list, &id_priv->listen_list);
1227
1228 ret = rdma_listen(id, id_priv->backlog);
1229 if (ret)
1230 goto err;
1231
1232 return;
1233 err:
1234 cma_destroy_listen(dev_id_priv);
1235 }
1236
1237 static void cma_listen_on_all(struct rdma_id_private *id_priv)
1238 {
1239 struct cma_device *cma_dev;
1240
1241 mutex_lock(&lock);
1242 list_add_tail(&id_priv->list, &listen_any_list);
1243 list_for_each_entry(cma_dev, &dev_list, list)
1244 cma_listen_on_dev(id_priv, cma_dev);
1245 mutex_unlock(&lock);
1246 }
1247
1248 static int cma_bind_any(struct rdma_cm_id *id, sa_family_t af)
1249 {
1250 struct sockaddr_in addr_in;
1251
1252 memset(&addr_in, 0, sizeof addr_in);
1253 addr_in.sin_family = af;
1254 return rdma_bind_addr(id, (struct sockaddr *) &addr_in);
1255 }
1256
1257 int rdma_listen(struct rdma_cm_id *id, int backlog)
1258 {
1259 struct rdma_id_private *id_priv;
1260 int ret;
1261
1262 id_priv = container_of(id, struct rdma_id_private, id);
1263 if (id_priv->state == CMA_IDLE) {
1264 ret = cma_bind_any(id, AF_INET);
1265 if (ret)
1266 return ret;
1267 }
1268
1269 if (!cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_LISTEN))
1270 return -EINVAL;
1271
1272 id_priv->backlog = backlog;
1273 if (id->device) {
1274 switch (rdma_node_get_transport(id->device->node_type)) {
1275 case RDMA_TRANSPORT_IB:
1276 ret = cma_ib_listen(id_priv);
1277 if (ret)
1278 goto err;
1279 break;
1280 case RDMA_TRANSPORT_IWARP:
1281 ret = cma_iw_listen(id_priv, backlog);
1282 if (ret)
1283 goto err;
1284 break;
1285 default:
1286 ret = -ENOSYS;
1287 goto err;
1288 }
1289 } else
1290 cma_listen_on_all(id_priv);
1291
1292 return 0;
1293 err:
1294 id_priv->backlog = 0;
1295 cma_comp_exch(id_priv, CMA_LISTEN, CMA_ADDR_BOUND);
1296 return ret;
1297 }
1298 EXPORT_SYMBOL(rdma_listen);
1299
1300 static void cma_query_handler(int status, struct ib_sa_path_rec *path_rec,
1301 void *context)
1302 {
1303 struct cma_work *work = context;
1304 struct rdma_route *route;
1305
1306 route = &work->id->id.route;
1307
1308 if (!status) {
1309 route->num_paths = 1;
1310 *route->path_rec = *path_rec;
1311 } else {
1312 work->old_state = CMA_ROUTE_QUERY;
1313 work->new_state = CMA_ADDR_RESOLVED;
1314 work->event.event = RDMA_CM_EVENT_ROUTE_ERROR;
1315 work->event.status = status;
1316 }
1317
1318 queue_work(cma_wq, &work->work);
1319 }
1320
1321 static int cma_query_ib_route(struct rdma_id_private *id_priv, int timeout_ms,
1322 struct cma_work *work)
1323 {
1324 struct rdma_dev_addr *addr = &id_priv->id.route.addr.dev_addr;
1325 struct ib_sa_path_rec path_rec;
1326
1327 memset(&path_rec, 0, sizeof path_rec);
1328 ib_addr_get_sgid(addr, &path_rec.sgid);
1329 ib_addr_get_dgid(addr, &path_rec.dgid);
1330 path_rec.pkey = cpu_to_be16(ib_addr_get_pkey(addr));
1331 path_rec.numb_path = 1;
1332
1333 id_priv->query_id = ib_sa_path_rec_get(&sa_client, id_priv->id.device,
1334 id_priv->id.port_num, &path_rec,
1335 IB_SA_PATH_REC_DGID | IB_SA_PATH_REC_SGID |
1336 IB_SA_PATH_REC_PKEY | IB_SA_PATH_REC_NUMB_PATH,
1337 timeout_ms, GFP_KERNEL,
1338 cma_query_handler, work, &id_priv->query);
1339
1340 return (id_priv->query_id < 0) ? id_priv->query_id : 0;
1341 }
1342
1343 static void cma_work_handler(struct work_struct *_work)
1344 {
1345 struct cma_work *work = container_of(_work, struct cma_work, work);
1346 struct rdma_id_private *id_priv = work->id;
1347 int destroy = 0;
1348
1349 atomic_inc(&id_priv->dev_remove);
1350 if (!cma_comp_exch(id_priv, work->old_state, work->new_state))
1351 goto out;
1352
1353 if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
1354 cma_exch(id_priv, CMA_DESTROYING);
1355 destroy = 1;
1356 }
1357 out:
1358 cma_release_remove(id_priv);
1359 cma_deref_id(id_priv);
1360 if (destroy)
1361 rdma_destroy_id(&id_priv->id);
1362 kfree(work);
1363 }
1364
1365 static int cma_resolve_ib_route(struct rdma_id_private *id_priv, int timeout_ms)
1366 {
1367 struct rdma_route *route = &id_priv->id.route;
1368 struct cma_work *work;
1369 int ret;
1370
1371 work = kzalloc(sizeof *work, GFP_KERNEL);
1372 if (!work)
1373 return -ENOMEM;
1374
1375 work->id = id_priv;
1376 INIT_WORK(&work->work, cma_work_handler);
1377 work->old_state = CMA_ROUTE_QUERY;
1378 work->new_state = CMA_ROUTE_RESOLVED;
1379 work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
1380
1381 route->path_rec = kmalloc(sizeof *route->path_rec, GFP_KERNEL);
1382 if (!route->path_rec) {
1383 ret = -ENOMEM;
1384 goto err1;
1385 }
1386
1387 ret = cma_query_ib_route(id_priv, timeout_ms, work);
1388 if (ret)
1389 goto err2;
1390
1391 return 0;
1392 err2:
1393 kfree(route->path_rec);
1394 route->path_rec = NULL;
1395 err1:
1396 kfree(work);
1397 return ret;
1398 }
1399
1400 int rdma_set_ib_paths(struct rdma_cm_id *id,
1401 struct ib_sa_path_rec *path_rec, int num_paths)
1402 {
1403 struct rdma_id_private *id_priv;
1404 int ret;
1405
1406 id_priv = container_of(id, struct rdma_id_private, id);
1407 if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ROUTE_RESOLVED))
1408 return -EINVAL;
1409
1410 id->route.path_rec = kmalloc(sizeof *path_rec * num_paths, GFP_KERNEL);
1411 if (!id->route.path_rec) {
1412 ret = -ENOMEM;
1413 goto err;
1414 }
1415
1416 memcpy(id->route.path_rec, path_rec, sizeof *path_rec * num_paths);
1417 return 0;
1418 err:
1419 cma_comp_exch(id_priv, CMA_ROUTE_RESOLVED, CMA_ADDR_RESOLVED);
1420 return ret;
1421 }
1422 EXPORT_SYMBOL(rdma_set_ib_paths);
1423
1424 static int cma_resolve_iw_route(struct rdma_id_private *id_priv, int timeout_ms)
1425 {
1426 struct cma_work *work;
1427
1428 work = kzalloc(sizeof *work, GFP_KERNEL);
1429 if (!work)
1430 return -ENOMEM;
1431
1432 work->id = id_priv;
1433 INIT_WORK(&work->work, cma_work_handler);
1434 work->old_state = CMA_ROUTE_QUERY;
1435 work->new_state = CMA_ROUTE_RESOLVED;
1436 work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
1437 queue_work(cma_wq, &work->work);
1438 return 0;
1439 }
1440
1441 int rdma_resolve_route(struct rdma_cm_id *id, int timeout_ms)
1442 {
1443 struct rdma_id_private *id_priv;
1444 int ret;
1445
1446 id_priv = container_of(id, struct rdma_id_private, id);
1447 if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ROUTE_QUERY))
1448 return -EINVAL;
1449
1450 atomic_inc(&id_priv->refcount);
1451 switch (rdma_node_get_transport(id->device->node_type)) {
1452 case RDMA_TRANSPORT_IB:
1453 ret = cma_resolve_ib_route(id_priv, timeout_ms);
1454 break;
1455 case RDMA_TRANSPORT_IWARP:
1456 ret = cma_resolve_iw_route(id_priv, timeout_ms);
1457 break;
1458 default:
1459 ret = -ENOSYS;
1460 break;
1461 }
1462 if (ret)
1463 goto err;
1464
1465 return 0;
1466 err:
1467 cma_comp_exch(id_priv, CMA_ROUTE_QUERY, CMA_ADDR_RESOLVED);
1468 cma_deref_id(id_priv);
1469 return ret;
1470 }
1471 EXPORT_SYMBOL(rdma_resolve_route);
1472
1473 static int cma_bind_loopback(struct rdma_id_private *id_priv)
1474 {
1475 struct cma_device *cma_dev;
1476 struct ib_port_attr port_attr;
1477 union ib_gid gid;
1478 u16 pkey;
1479 int ret;
1480 u8 p;
1481
1482 mutex_lock(&lock);
1483 if (list_empty(&dev_list)) {
1484 ret = -ENODEV;
1485 goto out;
1486 }
1487 list_for_each_entry(cma_dev, &dev_list, list)
1488 for (p = 1; p <= cma_dev->device->phys_port_cnt; ++p)
1489 if (!ib_query_port(cma_dev->device, p, &port_attr) &&
1490 port_attr.state == IB_PORT_ACTIVE)
1491 goto port_found;
1492
1493 p = 1;
1494 cma_dev = list_entry(dev_list.next, struct cma_device, list);
1495
1496 port_found:
1497 ret = ib_get_cached_gid(cma_dev->device, p, 0, &gid);
1498 if (ret)
1499 goto out;
1500
1501 ret = ib_get_cached_pkey(cma_dev->device, p, 0, &pkey);
1502 if (ret)
1503 goto out;
1504
1505 ib_addr_set_sgid(&id_priv->id.route.addr.dev_addr, &gid);
1506 ib_addr_set_pkey(&id_priv->id.route.addr.dev_addr, pkey);
1507 id_priv->id.port_num = p;
1508 cma_attach_to_dev(id_priv, cma_dev);
1509 out:
1510 mutex_unlock(&lock);
1511 return ret;
1512 }
1513
1514 static void addr_handler(int status, struct sockaddr *src_addr,
1515 struct rdma_dev_addr *dev_addr, void *context)
1516 {
1517 struct rdma_id_private *id_priv = context;
1518 enum rdma_cm_event_type event;
1519
1520 atomic_inc(&id_priv->dev_remove);
1521
1522 /*
1523 * Grab mutex to block rdma_destroy_id() from removing the device while
1524 * we're trying to acquire it.
1525 */
1526 mutex_lock(&lock);
1527 if (!cma_comp_exch(id_priv, CMA_ADDR_QUERY, CMA_ADDR_RESOLVED)) {
1528 mutex_unlock(&lock);
1529 goto out;
1530 }
1531
1532 if (!status && !id_priv->cma_dev)
1533 status = cma_acquire_dev(id_priv);
1534 mutex_unlock(&lock);
1535
1536 if (status) {
1537 if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ADDR_BOUND))
1538 goto out;
1539 event = RDMA_CM_EVENT_ADDR_ERROR;
1540 } else {
1541 memcpy(&id_priv->id.route.addr.src_addr, src_addr,
1542 ip_addr_size(src_addr));
1543 event = RDMA_CM_EVENT_ADDR_RESOLVED;
1544 }
1545
1546 if (cma_notify_user(id_priv, event, status, NULL, 0)) {
1547 cma_exch(id_priv, CMA_DESTROYING);
1548 cma_release_remove(id_priv);
1549 cma_deref_id(id_priv);
1550 rdma_destroy_id(&id_priv->id);
1551 return;
1552 }
1553 out:
1554 cma_release_remove(id_priv);
1555 cma_deref_id(id_priv);
1556 }
1557
1558 static int cma_resolve_loopback(struct rdma_id_private *id_priv)
1559 {
1560 struct cma_work *work;
1561 struct sockaddr_in *src_in, *dst_in;
1562 union ib_gid gid;
1563 int ret;
1564
1565 work = kzalloc(sizeof *work, GFP_KERNEL);
1566 if (!work)
1567 return -ENOMEM;
1568
1569 if (!id_priv->cma_dev) {
1570 ret = cma_bind_loopback(id_priv);
1571 if (ret)
1572 goto err;
1573 }
1574
1575 ib_addr_get_sgid(&id_priv->id.route.addr.dev_addr, &gid);
1576 ib_addr_set_dgid(&id_priv->id.route.addr.dev_addr, &gid);
1577
1578 if (cma_zero_addr(&id_priv->id.route.addr.src_addr)) {
1579 src_in = (struct sockaddr_in *)&id_priv->id.route.addr.src_addr;
1580 dst_in = (struct sockaddr_in *)&id_priv->id.route.addr.dst_addr;
1581 src_in->sin_family = dst_in->sin_family;
1582 src_in->sin_addr.s_addr = dst_in->sin_addr.s_addr;
1583 }
1584
1585 work->id = id_priv;
1586 INIT_WORK(&work->work, cma_work_handler);
1587 work->old_state = CMA_ADDR_QUERY;
1588 work->new_state = CMA_ADDR_RESOLVED;
1589 work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
1590 queue_work(cma_wq, &work->work);
1591 return 0;
1592 err:
1593 kfree(work);
1594 return ret;
1595 }
1596
1597 static int cma_bind_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
1598 struct sockaddr *dst_addr)
1599 {
1600 if (src_addr && src_addr->sa_family)
1601 return rdma_bind_addr(id, src_addr);
1602 else
1603 return cma_bind_any(id, dst_addr->sa_family);
1604 }
1605
1606 int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
1607 struct sockaddr *dst_addr, int timeout_ms)
1608 {
1609 struct rdma_id_private *id_priv;
1610 int ret;
1611
1612 id_priv = container_of(id, struct rdma_id_private, id);
1613 if (id_priv->state == CMA_IDLE) {
1614 ret = cma_bind_addr(id, src_addr, dst_addr);
1615 if (ret)
1616 return ret;
1617 }
1618
1619 if (!cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_ADDR_QUERY))
1620 return -EINVAL;
1621
1622 atomic_inc(&id_priv->refcount);
1623 memcpy(&id->route.addr.dst_addr, dst_addr, ip_addr_size(dst_addr));
1624 if (cma_any_addr(dst_addr))
1625 ret = cma_resolve_loopback(id_priv);
1626 else
1627 ret = rdma_resolve_ip(&addr_client, &id->route.addr.src_addr,
1628 dst_addr, &id->route.addr.dev_addr,
1629 timeout_ms, addr_handler, id_priv);
1630 if (ret)
1631 goto err;
1632
1633 return 0;
1634 err:
1635 cma_comp_exch(id_priv, CMA_ADDR_QUERY, CMA_ADDR_BOUND);
1636 cma_deref_id(id_priv);
1637 return ret;
1638 }
1639 EXPORT_SYMBOL(rdma_resolve_addr);
1640
1641 static void cma_bind_port(struct rdma_bind_list *bind_list,
1642 struct rdma_id_private *id_priv)
1643 {
1644 struct sockaddr_in *sin;
1645
1646 sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
1647 sin->sin_port = htons(bind_list->port);
1648 id_priv->bind_list = bind_list;
1649 hlist_add_head(&id_priv->node, &bind_list->owners);
1650 }
1651
1652 static int cma_alloc_port(struct idr *ps, struct rdma_id_private *id_priv,
1653 unsigned short snum)
1654 {
1655 struct rdma_bind_list *bind_list;
1656 int port, start, ret;
1657
1658 bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL);
1659 if (!bind_list)
1660 return -ENOMEM;
1661
1662 start = snum ? snum : sysctl_local_port_range[0];
1663
1664 do {
1665 ret = idr_get_new_above(ps, bind_list, start, &port);
1666 } while ((ret == -EAGAIN) && idr_pre_get(ps, GFP_KERNEL));
1667
1668 if (ret)
1669 goto err;
1670
1671 if ((snum && port != snum) ||
1672 (!snum && port > sysctl_local_port_range[1])) {
1673 idr_remove(ps, port);
1674 ret = -EADDRNOTAVAIL;
1675 goto err;
1676 }
1677
1678 bind_list->ps = ps;
1679 bind_list->port = (unsigned short) port;
1680 cma_bind_port(bind_list, id_priv);
1681 return 0;
1682 err:
1683 kfree(bind_list);
1684 return ret;
1685 }
1686
1687 static int cma_use_port(struct idr *ps, struct rdma_id_private *id_priv)
1688 {
1689 struct rdma_id_private *cur_id;
1690 struct sockaddr_in *sin, *cur_sin;
1691 struct rdma_bind_list *bind_list;
1692 struct hlist_node *node;
1693 unsigned short snum;
1694
1695 sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
1696 snum = ntohs(sin->sin_port);
1697 if (snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
1698 return -EACCES;
1699
1700 bind_list = idr_find(ps, snum);
1701 if (!bind_list)
1702 return cma_alloc_port(ps, id_priv, snum);
1703
1704 /*
1705 * We don't support binding to any address if anyone is bound to
1706 * a specific address on the same port.
1707 */
1708 if (cma_any_addr(&id_priv->id.route.addr.src_addr))
1709 return -EADDRNOTAVAIL;
1710
1711 hlist_for_each_entry(cur_id, node, &bind_list->owners, node) {
1712 if (cma_any_addr(&cur_id->id.route.addr.src_addr))
1713 return -EADDRNOTAVAIL;
1714
1715 cur_sin = (struct sockaddr_in *) &cur_id->id.route.addr.src_addr;
1716 if (sin->sin_addr.s_addr == cur_sin->sin_addr.s_addr)
1717 return -EADDRINUSE;
1718 }
1719
1720 cma_bind_port(bind_list, id_priv);
1721 return 0;
1722 }
1723
1724 static int cma_get_port(struct rdma_id_private *id_priv)
1725 {
1726 struct idr *ps;
1727 int ret;
1728
1729 switch (id_priv->id.ps) {
1730 case RDMA_PS_SDP:
1731 ps = &sdp_ps;
1732 break;
1733 case RDMA_PS_TCP:
1734 ps = &tcp_ps;
1735 break;
1736 default:
1737 return -EPROTONOSUPPORT;
1738 }
1739
1740 mutex_lock(&lock);
1741 if (cma_any_port(&id_priv->id.route.addr.src_addr))
1742 ret = cma_alloc_port(ps, id_priv, 0);
1743 else
1744 ret = cma_use_port(ps, id_priv);
1745 mutex_unlock(&lock);
1746
1747 return ret;
1748 }
1749
1750 int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr)
1751 {
1752 struct rdma_id_private *id_priv;
1753 int ret;
1754
1755 if (addr->sa_family != AF_INET)
1756 return -EAFNOSUPPORT;
1757
1758 id_priv = container_of(id, struct rdma_id_private, id);
1759 if (!cma_comp_exch(id_priv, CMA_IDLE, CMA_ADDR_BOUND))
1760 return -EINVAL;
1761
1762 if (!cma_any_addr(addr)) {
1763 ret = rdma_translate_ip(addr, &id->route.addr.dev_addr);
1764 if (ret)
1765 goto err1;
1766
1767 mutex_lock(&lock);
1768 ret = cma_acquire_dev(id_priv);
1769 mutex_unlock(&lock);
1770 if (ret)
1771 goto err1;
1772 }
1773
1774 memcpy(&id->route.addr.src_addr, addr, ip_addr_size(addr));
1775 ret = cma_get_port(id_priv);
1776 if (ret)
1777 goto err2;
1778
1779 return 0;
1780 err2:
1781 if (!cma_any_addr(addr)) {
1782 mutex_lock(&lock);
1783 cma_detach_from_dev(id_priv);
1784 mutex_unlock(&lock);
1785 }
1786 err1:
1787 cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_IDLE);
1788 return ret;
1789 }
1790 EXPORT_SYMBOL(rdma_bind_addr);
1791
1792 static int cma_format_hdr(void *hdr, enum rdma_port_space ps,
1793 struct rdma_route *route)
1794 {
1795 struct sockaddr_in *src4, *dst4;
1796 struct cma_hdr *cma_hdr;
1797 struct sdp_hh *sdp_hdr;
1798
1799 src4 = (struct sockaddr_in *) &route->addr.src_addr;
1800 dst4 = (struct sockaddr_in *) &route->addr.dst_addr;
1801
1802 switch (ps) {
1803 case RDMA_PS_SDP:
1804 sdp_hdr = hdr;
1805 if (sdp_get_majv(sdp_hdr->sdp_version) != SDP_MAJ_VERSION)
1806 return -EINVAL;
1807 sdp_set_ip_ver(sdp_hdr, 4);
1808 sdp_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
1809 sdp_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
1810 sdp_hdr->port = src4->sin_port;
1811 break;
1812 default:
1813 cma_hdr = hdr;
1814 cma_hdr->cma_version = CMA_VERSION;
1815 cma_set_ip_ver(cma_hdr, 4);
1816 cma_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
1817 cma_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
1818 cma_hdr->port = src4->sin_port;
1819 break;
1820 }
1821 return 0;
1822 }
1823
1824 static int cma_connect_ib(struct rdma_id_private *id_priv,
1825 struct rdma_conn_param *conn_param)
1826 {
1827 struct ib_cm_req_param req;
1828 struct rdma_route *route;
1829 void *private_data;
1830 int offset, ret;
1831
1832 memset(&req, 0, sizeof req);
1833 offset = cma_user_data_offset(id_priv->id.ps);
1834 req.private_data_len = offset + conn_param->private_data_len;
1835 private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
1836 if (!private_data)
1837 return -ENOMEM;
1838
1839 if (conn_param->private_data && conn_param->private_data_len)
1840 memcpy(private_data + offset, conn_param->private_data,
1841 conn_param->private_data_len);
1842
1843 id_priv->cm_id.ib = ib_create_cm_id(id_priv->id.device, cma_ib_handler,
1844 id_priv);
1845 if (IS_ERR(id_priv->cm_id.ib)) {
1846 ret = PTR_ERR(id_priv->cm_id.ib);
1847 goto out;
1848 }
1849
1850 route = &id_priv->id.route;
1851 ret = cma_format_hdr(private_data, id_priv->id.ps, route);
1852 if (ret)
1853 goto out;
1854 req.private_data = private_data;
1855
1856 req.primary_path = &route->path_rec[0];
1857 if (route->num_paths == 2)
1858 req.alternate_path = &route->path_rec[1];
1859
1860 req.service_id = cma_get_service_id(id_priv->id.ps,
1861 &route->addr.dst_addr);
1862 req.qp_num = id_priv->qp_num;
1863 req.qp_type = id_priv->qp_type;
1864 req.starting_psn = id_priv->seq_num;
1865 req.responder_resources = conn_param->responder_resources;
1866 req.initiator_depth = conn_param->initiator_depth;
1867 req.flow_control = conn_param->flow_control;
1868 req.retry_count = conn_param->retry_count;
1869 req.rnr_retry_count = conn_param->rnr_retry_count;
1870 req.remote_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
1871 req.local_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
1872 req.max_cm_retries = CMA_MAX_CM_RETRIES;
1873 req.srq = id_priv->srq ? 1 : 0;
1874
1875 ret = ib_send_cm_req(id_priv->cm_id.ib, &req);
1876 out:
1877 if (ret && !IS_ERR(id_priv->cm_id.ib)) {
1878 ib_destroy_cm_id(id_priv->cm_id.ib);
1879 id_priv->cm_id.ib = NULL;
1880 }
1881
1882 kfree(private_data);
1883 return ret;
1884 }
1885
1886 static int cma_connect_iw(struct rdma_id_private *id_priv,
1887 struct rdma_conn_param *conn_param)
1888 {
1889 struct iw_cm_id *cm_id;
1890 struct sockaddr_in* sin;
1891 int ret;
1892 struct iw_cm_conn_param iw_param;
1893
1894 cm_id = iw_create_cm_id(id_priv->id.device, cma_iw_handler, id_priv);
1895 if (IS_ERR(cm_id)) {
1896 ret = PTR_ERR(cm_id);
1897 goto out;
1898 }
1899
1900 id_priv->cm_id.iw = cm_id;
1901
1902 sin = (struct sockaddr_in*) &id_priv->id.route.addr.src_addr;
1903 cm_id->local_addr = *sin;
1904
1905 sin = (struct sockaddr_in*) &id_priv->id.route.addr.dst_addr;
1906 cm_id->remote_addr = *sin;
1907
1908 ret = cma_modify_qp_rtr(&id_priv->id);
1909 if (ret)
1910 goto out;
1911
1912 iw_param.ord = conn_param->initiator_depth;
1913 iw_param.ird = conn_param->responder_resources;
1914 iw_param.private_data = conn_param->private_data;
1915 iw_param.private_data_len = conn_param->private_data_len;
1916 if (id_priv->id.qp)
1917 iw_param.qpn = id_priv->qp_num;
1918 else
1919 iw_param.qpn = conn_param->qp_num;
1920 ret = iw_cm_connect(cm_id, &iw_param);
1921 out:
1922 if (ret && !IS_ERR(cm_id)) {
1923 iw_destroy_cm_id(cm_id);
1924 id_priv->cm_id.iw = NULL;
1925 }
1926 return ret;
1927 }
1928
1929 int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
1930 {
1931 struct rdma_id_private *id_priv;
1932 int ret;
1933
1934 id_priv = container_of(id, struct rdma_id_private, id);
1935 if (!cma_comp_exch(id_priv, CMA_ROUTE_RESOLVED, CMA_CONNECT))
1936 return -EINVAL;
1937
1938 if (!id->qp) {
1939 id_priv->qp_num = conn_param->qp_num;
1940 id_priv->qp_type = conn_param->qp_type;
1941 id_priv->srq = conn_param->srq;
1942 }
1943
1944 switch (rdma_node_get_transport(id->device->node_type)) {
1945 case RDMA_TRANSPORT_IB:
1946 ret = cma_connect_ib(id_priv, conn_param);
1947 break;
1948 case RDMA_TRANSPORT_IWARP:
1949 ret = cma_connect_iw(id_priv, conn_param);
1950 break;
1951 default:
1952 ret = -ENOSYS;
1953 break;
1954 }
1955 if (ret)
1956 goto err;
1957
1958 return 0;
1959 err:
1960 cma_comp_exch(id_priv, CMA_CONNECT, CMA_ROUTE_RESOLVED);
1961 return ret;
1962 }
1963 EXPORT_SYMBOL(rdma_connect);
1964
1965 static int cma_accept_ib(struct rdma_id_private *id_priv,
1966 struct rdma_conn_param *conn_param)
1967 {
1968 struct ib_cm_rep_param rep;
1969 int ret;
1970
1971 ret = cma_modify_qp_rtr(&id_priv->id);
1972 if (ret)
1973 return ret;
1974
1975 memset(&rep, 0, sizeof rep);
1976 rep.qp_num = id_priv->qp_num;
1977 rep.starting_psn = id_priv->seq_num;
1978 rep.private_data = conn_param->private_data;
1979 rep.private_data_len = conn_param->private_data_len;
1980 rep.responder_resources = conn_param->responder_resources;
1981 rep.initiator_depth = conn_param->initiator_depth;
1982 rep.target_ack_delay = CMA_CM_RESPONSE_TIMEOUT;
1983 rep.failover_accepted = 0;
1984 rep.flow_control = conn_param->flow_control;
1985 rep.rnr_retry_count = conn_param->rnr_retry_count;
1986 rep.srq = id_priv->srq ? 1 : 0;
1987
1988 return ib_send_cm_rep(id_priv->cm_id.ib, &rep);
1989 }
1990
1991 static int cma_accept_iw(struct rdma_id_private *id_priv,
1992 struct rdma_conn_param *conn_param)
1993 {
1994 struct iw_cm_conn_param iw_param;
1995 int ret;
1996
1997 ret = cma_modify_qp_rtr(&id_priv->id);
1998 if (ret)
1999 return ret;
2000
2001 iw_param.ord = conn_param->initiator_depth;
2002 iw_param.ird = conn_param->responder_resources;
2003 iw_param.private_data = conn_param->private_data;
2004 iw_param.private_data_len = conn_param->private_data_len;
2005 if (id_priv->id.qp) {
2006 iw_param.qpn = id_priv->qp_num;
2007 } else
2008 iw_param.qpn = conn_param->qp_num;
2009
2010 return iw_cm_accept(id_priv->cm_id.iw, &iw_param);
2011 }
2012
2013 int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
2014 {
2015 struct rdma_id_private *id_priv;
2016 int ret;
2017
2018 id_priv = container_of(id, struct rdma_id_private, id);
2019 if (!cma_comp(id_priv, CMA_CONNECT))
2020 return -EINVAL;
2021
2022 if (!id->qp && conn_param) {
2023 id_priv->qp_num = conn_param->qp_num;
2024 id_priv->qp_type = conn_param->qp_type;
2025 id_priv->srq = conn_param->srq;
2026 }
2027
2028 switch (rdma_node_get_transport(id->device->node_type)) {
2029 case RDMA_TRANSPORT_IB:
2030 if (conn_param)
2031 ret = cma_accept_ib(id_priv, conn_param);
2032 else
2033 ret = cma_rep_recv(id_priv);
2034 break;
2035 case RDMA_TRANSPORT_IWARP:
2036 ret = cma_accept_iw(id_priv, conn_param);
2037 break;
2038 default:
2039 ret = -ENOSYS;
2040 break;
2041 }
2042
2043 if (ret)
2044 goto reject;
2045
2046 return 0;
2047 reject:
2048 cma_modify_qp_err(id);
2049 rdma_reject(id, NULL, 0);
2050 return ret;
2051 }
2052 EXPORT_SYMBOL(rdma_accept);
2053
2054 int rdma_reject(struct rdma_cm_id *id, const void *private_data,
2055 u8 private_data_len)
2056 {
2057 struct rdma_id_private *id_priv;
2058 int ret;
2059
2060 id_priv = container_of(id, struct rdma_id_private, id);
2061 if (!cma_comp(id_priv, CMA_CONNECT))
2062 return -EINVAL;
2063
2064 switch (rdma_node_get_transport(id->device->node_type)) {
2065 case RDMA_TRANSPORT_IB:
2066 ret = ib_send_cm_rej(id_priv->cm_id.ib,
2067 IB_CM_REJ_CONSUMER_DEFINED, NULL, 0,
2068 private_data, private_data_len);
2069 break;
2070 case RDMA_TRANSPORT_IWARP:
2071 ret = iw_cm_reject(id_priv->cm_id.iw,
2072 private_data, private_data_len);
2073 break;
2074 default:
2075 ret = -ENOSYS;
2076 break;
2077 }
2078 return ret;
2079 }
2080 EXPORT_SYMBOL(rdma_reject);
2081
2082 int rdma_disconnect(struct rdma_cm_id *id)
2083 {
2084 struct rdma_id_private *id_priv;
2085 int ret;
2086
2087 id_priv = container_of(id, struct rdma_id_private, id);
2088 if (!cma_comp(id_priv, CMA_CONNECT) &&
2089 !cma_comp(id_priv, CMA_DISCONNECT))
2090 return -EINVAL;
2091
2092 switch (rdma_node_get_transport(id->device->node_type)) {
2093 case RDMA_TRANSPORT_IB:
2094 ret = cma_modify_qp_err(id);
2095 if (ret)
2096 goto out;
2097 /* Initiate or respond to a disconnect. */
2098 if (ib_send_cm_dreq(id_priv->cm_id.ib, NULL, 0))
2099 ib_send_cm_drep(id_priv->cm_id.ib, NULL, 0);
2100 break;
2101 case RDMA_TRANSPORT_IWARP:
2102 ret = iw_cm_disconnect(id_priv->cm_id.iw, 0);
2103 break;
2104 default:
2105 ret = -EINVAL;
2106 break;
2107 }
2108 out:
2109 return ret;
2110 }
2111 EXPORT_SYMBOL(rdma_disconnect);
2112
2113 static void cma_add_one(struct ib_device *device)
2114 {
2115 struct cma_device *cma_dev;
2116 struct rdma_id_private *id_priv;
2117
2118 cma_dev = kmalloc(sizeof *cma_dev, GFP_KERNEL);
2119 if (!cma_dev)
2120 return;
2121
2122 cma_dev->device = device;
2123 cma_dev->node_guid = device->node_guid;
2124
2125 init_completion(&cma_dev->comp);
2126 atomic_set(&cma_dev->refcount, 1);
2127 INIT_LIST_HEAD(&cma_dev->id_list);
2128 ib_set_client_data(device, &cma_client, cma_dev);
2129
2130 mutex_lock(&lock);
2131 list_add_tail(&cma_dev->list, &dev_list);
2132 list_for_each_entry(id_priv, &listen_any_list, list)
2133 cma_listen_on_dev(id_priv, cma_dev);
2134 mutex_unlock(&lock);
2135 }
2136
2137 static int cma_remove_id_dev(struct rdma_id_private *id_priv)
2138 {
2139 enum cma_state state;
2140
2141 /* Record that we want to remove the device */
2142 state = cma_exch(id_priv, CMA_DEVICE_REMOVAL);
2143 if (state == CMA_DESTROYING)
2144 return 0;
2145
2146 cma_cancel_operation(id_priv, state);
2147 wait_event(id_priv->wait_remove, !atomic_read(&id_priv->dev_remove));
2148
2149 /* Check for destruction from another callback. */
2150 if (!cma_comp(id_priv, CMA_DEVICE_REMOVAL))
2151 return 0;
2152
2153 return cma_notify_user(id_priv, RDMA_CM_EVENT_DEVICE_REMOVAL,
2154 0, NULL, 0);
2155 }
2156
2157 static void cma_process_remove(struct cma_device *cma_dev)
2158 {
2159 struct rdma_id_private *id_priv;
2160 int ret;
2161
2162 mutex_lock(&lock);
2163 while (!list_empty(&cma_dev->id_list)) {
2164 id_priv = list_entry(cma_dev->id_list.next,
2165 struct rdma_id_private, list);
2166
2167 if (cma_internal_listen(id_priv)) {
2168 cma_destroy_listen(id_priv);
2169 continue;
2170 }
2171
2172 list_del_init(&id_priv->list);
2173 atomic_inc(&id_priv->refcount);
2174 mutex_unlock(&lock);
2175
2176 ret = cma_remove_id_dev(id_priv);
2177 cma_deref_id(id_priv);
2178 if (ret)
2179 rdma_destroy_id(&id_priv->id);
2180
2181 mutex_lock(&lock);
2182 }
2183 mutex_unlock(&lock);
2184
2185 cma_deref_dev(cma_dev);
2186 wait_for_completion(&cma_dev->comp);
2187 }
2188
2189 static void cma_remove_one(struct ib_device *device)
2190 {
2191 struct cma_device *cma_dev;
2192
2193 cma_dev = ib_get_client_data(device, &cma_client);
2194 if (!cma_dev)
2195 return;
2196
2197 mutex_lock(&lock);
2198 list_del(&cma_dev->list);
2199 mutex_unlock(&lock);
2200
2201 cma_process_remove(cma_dev);
2202 kfree(cma_dev);
2203 }
2204
2205 static int cma_init(void)
2206 {
2207 int ret;
2208
2209 cma_wq = create_singlethread_workqueue("rdma_cm_wq");
2210 if (!cma_wq)
2211 return -ENOMEM;
2212
2213 ib_sa_register_client(&sa_client);
2214 rdma_addr_register_client(&addr_client);
2215
2216 ret = ib_register_client(&cma_client);
2217 if (ret)
2218 goto err;
2219 return 0;
2220
2221 err:
2222 rdma_addr_unregister_client(&addr_client);
2223 ib_sa_unregister_client(&sa_client);
2224 destroy_workqueue(cma_wq);
2225 return ret;
2226 }
2227
2228 static void cma_cleanup(void)
2229 {
2230 ib_unregister_client(&cma_client);
2231 rdma_addr_unregister_client(&addr_client);
2232 ib_sa_unregister_client(&sa_client);
2233 destroy_workqueue(cma_wq);
2234 idr_destroy(&sdp_ps);
2235 idr_destroy(&tcp_ps);
2236 }
2237
2238 module_init(cma_init);
2239 module_exit(cma_cleanup);
Linux kernel - Deliverables
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