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