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RDMA/cma: Increment port number after close to avoid re-use
[GitHub/mt8127/android_kernel_alcatel_ttab.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 static DEFINE_IDR(udp_ps);
74 static int next_port;
75
76 struct cma_device {
77 struct list_head list;
78 struct ib_device *device;
79 __be64 node_guid;
80 struct completion comp;
81 atomic_t refcount;
82 struct list_head id_list;
83 };
84
85 enum cma_state {
86 CMA_IDLE,
87 CMA_ADDR_QUERY,
88 CMA_ADDR_RESOLVED,
89 CMA_ROUTE_QUERY,
90 CMA_ROUTE_RESOLVED,
91 CMA_CONNECT,
92 CMA_DISCONNECT,
93 CMA_ADDR_BOUND,
94 CMA_LISTEN,
95 CMA_DEVICE_REMOVAL,
96 CMA_DESTROYING
97 };
98
99 struct rdma_bind_list {
100 struct idr *ps;
101 struct hlist_head owners;
102 unsigned short port;
103 };
104
105 /*
106 * Device removal can occur at anytime, so we need extra handling to
107 * serialize notifying the user of device removal with other callbacks.
108 * We do this by disabling removal notification while a callback is in process,
109 * and reporting it after the callback completes.
110 */
111 struct rdma_id_private {
112 struct rdma_cm_id id;
113
114 struct rdma_bind_list *bind_list;
115 struct hlist_node node;
116 struct list_head list;
117 struct list_head listen_list;
118 struct cma_device *cma_dev;
119
120 enum cma_state state;
121 spinlock_t lock;
122 struct completion comp;
123 atomic_t refcount;
124 wait_queue_head_t wait_remove;
125 atomic_t dev_remove;
126
127 int backlog;
128 int timeout_ms;
129 struct ib_sa_query *query;
130 int query_id;
131 union {
132 struct ib_cm_id *ib;
133 struct iw_cm_id *iw;
134 } cm_id;
135
136 u32 seq_num;
137 u32 qp_num;
138 u8 srq;
139 };
140
141 struct cma_work {
142 struct work_struct work;
143 struct rdma_id_private *id;
144 enum cma_state old_state;
145 enum cma_state new_state;
146 struct rdma_cm_event event;
147 };
148
149 union cma_ip_addr {
150 struct in6_addr ip6;
151 struct {
152 __u32 pad[3];
153 __u32 addr;
154 } ip4;
155 };
156
157 struct cma_hdr {
158 u8 cma_version;
159 u8 ip_version; /* IP version: 7:4 */
160 __u16 port;
161 union cma_ip_addr src_addr;
162 union cma_ip_addr dst_addr;
163 };
164
165 struct sdp_hh {
166 u8 bsdh[16];
167 u8 sdp_version; /* Major version: 7:4 */
168 u8 ip_version; /* IP version: 7:4 */
169 u8 sdp_specific1[10];
170 __u16 port;
171 __u16 sdp_specific2;
172 union cma_ip_addr src_addr;
173 union cma_ip_addr dst_addr;
174 };
175
176 struct sdp_hah {
177 u8 bsdh[16];
178 u8 sdp_version;
179 };
180
181 #define CMA_VERSION 0x00
182 #define SDP_MAJ_VERSION 0x2
183
184 static int cma_comp(struct rdma_id_private *id_priv, enum cma_state comp)
185 {
186 unsigned long flags;
187 int ret;
188
189 spin_lock_irqsave(&id_priv->lock, flags);
190 ret = (id_priv->state == comp);
191 spin_unlock_irqrestore(&id_priv->lock, flags);
192 return ret;
193 }
194
195 static int cma_comp_exch(struct rdma_id_private *id_priv,
196 enum cma_state comp, enum cma_state exch)
197 {
198 unsigned long flags;
199 int ret;
200
201 spin_lock_irqsave(&id_priv->lock, flags);
202 if ((ret = (id_priv->state == comp)))
203 id_priv->state = exch;
204 spin_unlock_irqrestore(&id_priv->lock, flags);
205 return ret;
206 }
207
208 static enum cma_state cma_exch(struct rdma_id_private *id_priv,
209 enum cma_state exch)
210 {
211 unsigned long flags;
212 enum cma_state old;
213
214 spin_lock_irqsave(&id_priv->lock, flags);
215 old = id_priv->state;
216 id_priv->state = exch;
217 spin_unlock_irqrestore(&id_priv->lock, flags);
218 return old;
219 }
220
221 static inline u8 cma_get_ip_ver(struct cma_hdr *hdr)
222 {
223 return hdr->ip_version >> 4;
224 }
225
226 static inline void cma_set_ip_ver(struct cma_hdr *hdr, u8 ip_ver)
227 {
228 hdr->ip_version = (ip_ver << 4) | (hdr->ip_version & 0xF);
229 }
230
231 static inline u8 sdp_get_majv(u8 sdp_version)
232 {
233 return sdp_version >> 4;
234 }
235
236 static inline u8 sdp_get_ip_ver(struct sdp_hh *hh)
237 {
238 return hh->ip_version >> 4;
239 }
240
241 static inline void sdp_set_ip_ver(struct sdp_hh *hh, u8 ip_ver)
242 {
243 hh->ip_version = (ip_ver << 4) | (hh->ip_version & 0xF);
244 }
245
246 static void cma_attach_to_dev(struct rdma_id_private *id_priv,
247 struct cma_device *cma_dev)
248 {
249 atomic_inc(&cma_dev->refcount);
250 id_priv->cma_dev = cma_dev;
251 id_priv->id.device = cma_dev->device;
252 list_add_tail(&id_priv->list, &cma_dev->id_list);
253 }
254
255 static inline void cma_deref_dev(struct cma_device *cma_dev)
256 {
257 if (atomic_dec_and_test(&cma_dev->refcount))
258 complete(&cma_dev->comp);
259 }
260
261 static void cma_detach_from_dev(struct rdma_id_private *id_priv)
262 {
263 list_del(&id_priv->list);
264 cma_deref_dev(id_priv->cma_dev);
265 id_priv->cma_dev = NULL;
266 }
267
268 static int cma_acquire_dev(struct rdma_id_private *id_priv)
269 {
270 enum rdma_node_type dev_type = id_priv->id.route.addr.dev_addr.dev_type;
271 struct cma_device *cma_dev;
272 union ib_gid gid;
273 int ret = -ENODEV;
274
275 switch (rdma_node_get_transport(dev_type)) {
276 case RDMA_TRANSPORT_IB:
277 ib_addr_get_sgid(&id_priv->id.route.addr.dev_addr, &gid);
278 break;
279 case RDMA_TRANSPORT_IWARP:
280 iw_addr_get_sgid(&id_priv->id.route.addr.dev_addr, &gid);
281 break;
282 default:
283 return -ENODEV;
284 }
285
286 list_for_each_entry(cma_dev, &dev_list, list) {
287 ret = ib_find_cached_gid(cma_dev->device, &gid,
288 &id_priv->id.port_num, NULL);
289 if (!ret) {
290 cma_attach_to_dev(id_priv, cma_dev);
291 break;
292 }
293 }
294 return ret;
295 }
296
297 static void cma_deref_id(struct rdma_id_private *id_priv)
298 {
299 if (atomic_dec_and_test(&id_priv->refcount))
300 complete(&id_priv->comp);
301 }
302
303 static void cma_release_remove(struct rdma_id_private *id_priv)
304 {
305 if (atomic_dec_and_test(&id_priv->dev_remove))
306 wake_up(&id_priv->wait_remove);
307 }
308
309 struct rdma_cm_id *rdma_create_id(rdma_cm_event_handler event_handler,
310 void *context, enum rdma_port_space ps)
311 {
312 struct rdma_id_private *id_priv;
313
314 id_priv = kzalloc(sizeof *id_priv, GFP_KERNEL);
315 if (!id_priv)
316 return ERR_PTR(-ENOMEM);
317
318 id_priv->state = CMA_IDLE;
319 id_priv->id.context = context;
320 id_priv->id.event_handler = event_handler;
321 id_priv->id.ps = ps;
322 spin_lock_init(&id_priv->lock);
323 init_completion(&id_priv->comp);
324 atomic_set(&id_priv->refcount, 1);
325 init_waitqueue_head(&id_priv->wait_remove);
326 atomic_set(&id_priv->dev_remove, 0);
327 INIT_LIST_HEAD(&id_priv->listen_list);
328 get_random_bytes(&id_priv->seq_num, sizeof id_priv->seq_num);
329
330 return &id_priv->id;
331 }
332 EXPORT_SYMBOL(rdma_create_id);
333
334 static int cma_init_ib_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
335 {
336 struct ib_qp_attr qp_attr;
337 struct rdma_dev_addr *dev_addr;
338 int ret;
339
340 dev_addr = &id_priv->id.route.addr.dev_addr;
341 ret = ib_find_cached_pkey(id_priv->id.device, id_priv->id.port_num,
342 ib_addr_get_pkey(dev_addr),
343 &qp_attr.pkey_index);
344 if (ret)
345 return ret;
346
347 qp_attr.qp_state = IB_QPS_INIT;
348 qp_attr.qp_access_flags = 0;
349 qp_attr.port_num = id_priv->id.port_num;
350 return ib_modify_qp(qp, &qp_attr, IB_QP_STATE | IB_QP_ACCESS_FLAGS |
351 IB_QP_PKEY_INDEX | IB_QP_PORT);
352 }
353
354 static int cma_init_iw_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
355 {
356 struct ib_qp_attr qp_attr;
357
358 qp_attr.qp_state = IB_QPS_INIT;
359 qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE;
360
361 return ib_modify_qp(qp, &qp_attr, IB_QP_STATE | IB_QP_ACCESS_FLAGS);
362 }
363
364 int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd,
365 struct ib_qp_init_attr *qp_init_attr)
366 {
367 struct rdma_id_private *id_priv;
368 struct ib_qp *qp;
369 int ret;
370
371 id_priv = container_of(id, struct rdma_id_private, id);
372 if (id->device != pd->device)
373 return -EINVAL;
374
375 qp = ib_create_qp(pd, qp_init_attr);
376 if (IS_ERR(qp))
377 return PTR_ERR(qp);
378
379 switch (rdma_node_get_transport(id->device->node_type)) {
380 case RDMA_TRANSPORT_IB:
381 ret = cma_init_ib_qp(id_priv, qp);
382 break;
383 case RDMA_TRANSPORT_IWARP:
384 ret = cma_init_iw_qp(id_priv, qp);
385 break;
386 default:
387 ret = -ENOSYS;
388 break;
389 }
390
391 if (ret)
392 goto err;
393
394 id->qp = qp;
395 id_priv->qp_num = qp->qp_num;
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 __be16 cma_port(struct sockaddr *addr)
514 {
515 if (addr->sa_family == AF_INET)
516 return ((struct sockaddr_in *) addr)->sin_port;
517 else
518 return ((struct sockaddr_in6 *) addr)->sin6_port;
519 }
520
521 static inline int cma_any_port(struct sockaddr *addr)
522 {
523 return !cma_port(addr);
524 }
525
526 static int cma_get_net_info(void *hdr, enum rdma_port_space ps,
527 u8 *ip_ver, __u16 *port,
528 union cma_ip_addr **src, union cma_ip_addr **dst)
529 {
530 switch (ps) {
531 case RDMA_PS_SDP:
532 if (sdp_get_majv(((struct sdp_hh *) hdr)->sdp_version) !=
533 SDP_MAJ_VERSION)
534 return -EINVAL;
535
536 *ip_ver = sdp_get_ip_ver(hdr);
537 *port = ((struct sdp_hh *) hdr)->port;
538 *src = &((struct sdp_hh *) hdr)->src_addr;
539 *dst = &((struct sdp_hh *) hdr)->dst_addr;
540 break;
541 default:
542 if (((struct cma_hdr *) hdr)->cma_version != CMA_VERSION)
543 return -EINVAL;
544
545 *ip_ver = cma_get_ip_ver(hdr);
546 *port = ((struct cma_hdr *) hdr)->port;
547 *src = &((struct cma_hdr *) hdr)->src_addr;
548 *dst = &((struct cma_hdr *) hdr)->dst_addr;
549 break;
550 }
551
552 if (*ip_ver != 4 && *ip_ver != 6)
553 return -EINVAL;
554 return 0;
555 }
556
557 static void cma_save_net_info(struct rdma_addr *addr,
558 struct rdma_addr *listen_addr,
559 u8 ip_ver, __u16 port,
560 union cma_ip_addr *src, union cma_ip_addr *dst)
561 {
562 struct sockaddr_in *listen4, *ip4;
563 struct sockaddr_in6 *listen6, *ip6;
564
565 switch (ip_ver) {
566 case 4:
567 listen4 = (struct sockaddr_in *) &listen_addr->src_addr;
568 ip4 = (struct sockaddr_in *) &addr->src_addr;
569 ip4->sin_family = listen4->sin_family;
570 ip4->sin_addr.s_addr = dst->ip4.addr;
571 ip4->sin_port = listen4->sin_port;
572
573 ip4 = (struct sockaddr_in *) &addr->dst_addr;
574 ip4->sin_family = listen4->sin_family;
575 ip4->sin_addr.s_addr = src->ip4.addr;
576 ip4->sin_port = port;
577 break;
578 case 6:
579 listen6 = (struct sockaddr_in6 *) &listen_addr->src_addr;
580 ip6 = (struct sockaddr_in6 *) &addr->src_addr;
581 ip6->sin6_family = listen6->sin6_family;
582 ip6->sin6_addr = dst->ip6;
583 ip6->sin6_port = listen6->sin6_port;
584
585 ip6 = (struct sockaddr_in6 *) &addr->dst_addr;
586 ip6->sin6_family = listen6->sin6_family;
587 ip6->sin6_addr = src->ip6;
588 ip6->sin6_port = port;
589 break;
590 default:
591 break;
592 }
593 }
594
595 static inline int cma_user_data_offset(enum rdma_port_space ps)
596 {
597 switch (ps) {
598 case RDMA_PS_SDP:
599 return 0;
600 default:
601 return sizeof(struct cma_hdr);
602 }
603 }
604
605 static void cma_cancel_route(struct rdma_id_private *id_priv)
606 {
607 switch (rdma_node_get_transport(id_priv->id.device->node_type)) {
608 case RDMA_TRANSPORT_IB:
609 if (id_priv->query)
610 ib_sa_cancel_query(id_priv->query_id, id_priv->query);
611 break;
612 default:
613 break;
614 }
615 }
616
617 static inline int cma_internal_listen(struct rdma_id_private *id_priv)
618 {
619 return (id_priv->state == CMA_LISTEN) && id_priv->cma_dev &&
620 cma_any_addr(&id_priv->id.route.addr.src_addr);
621 }
622
623 static void cma_destroy_listen(struct rdma_id_private *id_priv)
624 {
625 cma_exch(id_priv, CMA_DESTROYING);
626
627 if (id_priv->cma_dev) {
628 switch (rdma_node_get_transport(id_priv->id.device->node_type)) {
629 case RDMA_TRANSPORT_IB:
630 if (id_priv->cm_id.ib && !IS_ERR(id_priv->cm_id.ib))
631 ib_destroy_cm_id(id_priv->cm_id.ib);
632 break;
633 case RDMA_TRANSPORT_IWARP:
634 if (id_priv->cm_id.iw && !IS_ERR(id_priv->cm_id.iw))
635 iw_destroy_cm_id(id_priv->cm_id.iw);
636 break;
637 default:
638 break;
639 }
640 cma_detach_from_dev(id_priv);
641 }
642 list_del(&id_priv->listen_list);
643
644 cma_deref_id(id_priv);
645 wait_for_completion(&id_priv->comp);
646
647 kfree(id_priv);
648 }
649
650 static void cma_cancel_listens(struct rdma_id_private *id_priv)
651 {
652 struct rdma_id_private *dev_id_priv;
653
654 mutex_lock(&lock);
655 list_del(&id_priv->list);
656
657 while (!list_empty(&id_priv->listen_list)) {
658 dev_id_priv = list_entry(id_priv->listen_list.next,
659 struct rdma_id_private, listen_list);
660 cma_destroy_listen(dev_id_priv);
661 }
662 mutex_unlock(&lock);
663 }
664
665 static void cma_cancel_operation(struct rdma_id_private *id_priv,
666 enum cma_state state)
667 {
668 switch (state) {
669 case CMA_ADDR_QUERY:
670 rdma_addr_cancel(&id_priv->id.route.addr.dev_addr);
671 break;
672 case CMA_ROUTE_QUERY:
673 cma_cancel_route(id_priv);
674 break;
675 case CMA_LISTEN:
676 if (cma_any_addr(&id_priv->id.route.addr.src_addr) &&
677 !id_priv->cma_dev)
678 cma_cancel_listens(id_priv);
679 break;
680 default:
681 break;
682 }
683 }
684
685 static void cma_release_port(struct rdma_id_private *id_priv)
686 {
687 struct rdma_bind_list *bind_list = id_priv->bind_list;
688
689 if (!bind_list)
690 return;
691
692 mutex_lock(&lock);
693 hlist_del(&id_priv->node);
694 if (hlist_empty(&bind_list->owners)) {
695 idr_remove(bind_list->ps, bind_list->port);
696 kfree(bind_list);
697 }
698 mutex_unlock(&lock);
699 }
700
701 void rdma_destroy_id(struct rdma_cm_id *id)
702 {
703 struct rdma_id_private *id_priv;
704 enum cma_state state;
705
706 id_priv = container_of(id, struct rdma_id_private, id);
707 state = cma_exch(id_priv, CMA_DESTROYING);
708 cma_cancel_operation(id_priv, state);
709
710 mutex_lock(&lock);
711 if (id_priv->cma_dev) {
712 mutex_unlock(&lock);
713 switch (rdma_node_get_transport(id->device->node_type)) {
714 case RDMA_TRANSPORT_IB:
715 if (id_priv->cm_id.ib && !IS_ERR(id_priv->cm_id.ib))
716 ib_destroy_cm_id(id_priv->cm_id.ib);
717 break;
718 case RDMA_TRANSPORT_IWARP:
719 if (id_priv->cm_id.iw && !IS_ERR(id_priv->cm_id.iw))
720 iw_destroy_cm_id(id_priv->cm_id.iw);
721 break;
722 default:
723 break;
724 }
725 mutex_lock(&lock);
726 cma_detach_from_dev(id_priv);
727 }
728 mutex_unlock(&lock);
729
730 cma_release_port(id_priv);
731 cma_deref_id(id_priv);
732 wait_for_completion(&id_priv->comp);
733
734 kfree(id_priv->id.route.path_rec);
735 kfree(id_priv);
736 }
737 EXPORT_SYMBOL(rdma_destroy_id);
738
739 static int cma_rep_recv(struct rdma_id_private *id_priv)
740 {
741 int ret;
742
743 ret = cma_modify_qp_rtr(&id_priv->id);
744 if (ret)
745 goto reject;
746
747 ret = cma_modify_qp_rts(&id_priv->id);
748 if (ret)
749 goto reject;
750
751 ret = ib_send_cm_rtu(id_priv->cm_id.ib, NULL, 0);
752 if (ret)
753 goto reject;
754
755 return 0;
756 reject:
757 cma_modify_qp_err(&id_priv->id);
758 ib_send_cm_rej(id_priv->cm_id.ib, IB_CM_REJ_CONSUMER_DEFINED,
759 NULL, 0, NULL, 0);
760 return ret;
761 }
762
763 static int cma_verify_rep(struct rdma_id_private *id_priv, void *data)
764 {
765 if (id_priv->id.ps == RDMA_PS_SDP &&
766 sdp_get_majv(((struct sdp_hah *) data)->sdp_version) !=
767 SDP_MAJ_VERSION)
768 return -EINVAL;
769
770 return 0;
771 }
772
773 static void cma_set_rep_event_data(struct rdma_cm_event *event,
774 struct ib_cm_rep_event_param *rep_data,
775 void *private_data)
776 {
777 event->param.conn.private_data = private_data;
778 event->param.conn.private_data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
779 event->param.conn.responder_resources = rep_data->responder_resources;
780 event->param.conn.initiator_depth = rep_data->initiator_depth;
781 event->param.conn.flow_control = rep_data->flow_control;
782 event->param.conn.rnr_retry_count = rep_data->rnr_retry_count;
783 event->param.conn.srq = rep_data->srq;
784 event->param.conn.qp_num = rep_data->remote_qpn;
785 }
786
787 static int cma_ib_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
788 {
789 struct rdma_id_private *id_priv = cm_id->context;
790 struct rdma_cm_event event;
791 int ret = 0;
792
793 atomic_inc(&id_priv->dev_remove);
794 if (!cma_comp(id_priv, CMA_CONNECT))
795 goto out;
796
797 memset(&event, 0, sizeof event);
798 switch (ib_event->event) {
799 case IB_CM_REQ_ERROR:
800 case IB_CM_REP_ERROR:
801 event.event = RDMA_CM_EVENT_UNREACHABLE;
802 event.status = -ETIMEDOUT;
803 break;
804 case IB_CM_REP_RECEIVED:
805 event.status = cma_verify_rep(id_priv, ib_event->private_data);
806 if (event.status)
807 event.event = RDMA_CM_EVENT_CONNECT_ERROR;
808 else if (id_priv->id.qp && id_priv->id.ps != RDMA_PS_SDP) {
809 event.status = cma_rep_recv(id_priv);
810 event.event = event.status ? RDMA_CM_EVENT_CONNECT_ERROR :
811 RDMA_CM_EVENT_ESTABLISHED;
812 } else
813 event.event = RDMA_CM_EVENT_CONNECT_RESPONSE;
814 cma_set_rep_event_data(&event, &ib_event->param.rep_rcvd,
815 ib_event->private_data);
816 break;
817 case IB_CM_RTU_RECEIVED:
818 case IB_CM_USER_ESTABLISHED:
819 event.event = RDMA_CM_EVENT_ESTABLISHED;
820 break;
821 case IB_CM_DREQ_ERROR:
822 event.status = -ETIMEDOUT; /* fall through */
823 case IB_CM_DREQ_RECEIVED:
824 case IB_CM_DREP_RECEIVED:
825 if (!cma_comp_exch(id_priv, CMA_CONNECT, CMA_DISCONNECT))
826 goto out;
827 event.event = RDMA_CM_EVENT_DISCONNECTED;
828 break;
829 case IB_CM_TIMEWAIT_EXIT:
830 case IB_CM_MRA_RECEIVED:
831 /* ignore event */
832 goto out;
833 case IB_CM_REJ_RECEIVED:
834 cma_modify_qp_err(&id_priv->id);
835 event.status = ib_event->param.rej_rcvd.reason;
836 event.event = RDMA_CM_EVENT_REJECTED;
837 event.param.conn.private_data = ib_event->private_data;
838 event.param.conn.private_data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
839 break;
840 default:
841 printk(KERN_ERR "RDMA CMA: unexpected IB CM event: %d",
842 ib_event->event);
843 goto out;
844 }
845
846 ret = id_priv->id.event_handler(&id_priv->id, &event);
847 if (ret) {
848 /* Destroy the CM ID by returning a non-zero value. */
849 id_priv->cm_id.ib = NULL;
850 cma_exch(id_priv, CMA_DESTROYING);
851 cma_release_remove(id_priv);
852 rdma_destroy_id(&id_priv->id);
853 return ret;
854 }
855 out:
856 cma_release_remove(id_priv);
857 return ret;
858 }
859
860 static struct rdma_id_private *cma_new_conn_id(struct rdma_cm_id *listen_id,
861 struct ib_cm_event *ib_event)
862 {
863 struct rdma_id_private *id_priv;
864 struct rdma_cm_id *id;
865 struct rdma_route *rt;
866 union cma_ip_addr *src, *dst;
867 __u16 port;
868 u8 ip_ver;
869
870 if (cma_get_net_info(ib_event->private_data, listen_id->ps,
871 &ip_ver, &port, &src, &dst))
872 goto err;
873
874 id = rdma_create_id(listen_id->event_handler, listen_id->context,
875 listen_id->ps);
876 if (IS_ERR(id))
877 goto err;
878
879 cma_save_net_info(&id->route.addr, &listen_id->route.addr,
880 ip_ver, port, src, dst);
881
882 rt = &id->route;
883 rt->num_paths = ib_event->param.req_rcvd.alternate_path ? 2 : 1;
884 rt->path_rec = kmalloc(sizeof *rt->path_rec * rt->num_paths,
885 GFP_KERNEL);
886 if (!rt->path_rec)
887 goto destroy_id;
888
889 rt->path_rec[0] = *ib_event->param.req_rcvd.primary_path;
890 if (rt->num_paths == 2)
891 rt->path_rec[1] = *ib_event->param.req_rcvd.alternate_path;
892
893 ib_addr_set_sgid(&rt->addr.dev_addr, &rt->path_rec[0].sgid);
894 ib_addr_set_dgid(&rt->addr.dev_addr, &rt->path_rec[0].dgid);
895 ib_addr_set_pkey(&rt->addr.dev_addr, be16_to_cpu(rt->path_rec[0].pkey));
896 rt->addr.dev_addr.dev_type = RDMA_NODE_IB_CA;
897
898 id_priv = container_of(id, struct rdma_id_private, id);
899 id_priv->state = CMA_CONNECT;
900 return id_priv;
901
902 destroy_id:
903 rdma_destroy_id(id);
904 err:
905 return NULL;
906 }
907
908 static struct rdma_id_private *cma_new_udp_id(struct rdma_cm_id *listen_id,
909 struct ib_cm_event *ib_event)
910 {
911 struct rdma_id_private *id_priv;
912 struct rdma_cm_id *id;
913 union cma_ip_addr *src, *dst;
914 __u16 port;
915 u8 ip_ver;
916 int ret;
917
918 id = rdma_create_id(listen_id->event_handler, listen_id->context,
919 listen_id->ps);
920 if (IS_ERR(id))
921 return NULL;
922
923
924 if (cma_get_net_info(ib_event->private_data, listen_id->ps,
925 &ip_ver, &port, &src, &dst))
926 goto err;
927
928 cma_save_net_info(&id->route.addr, &listen_id->route.addr,
929 ip_ver, port, src, dst);
930
931 ret = rdma_translate_ip(&id->route.addr.src_addr,
932 &id->route.addr.dev_addr);
933 if (ret)
934 goto err;
935
936 id_priv = container_of(id, struct rdma_id_private, id);
937 id_priv->state = CMA_CONNECT;
938 return id_priv;
939 err:
940 rdma_destroy_id(id);
941 return NULL;
942 }
943
944 static void cma_set_req_event_data(struct rdma_cm_event *event,
945 struct ib_cm_req_event_param *req_data,
946 void *private_data, int offset)
947 {
948 event->param.conn.private_data = private_data + offset;
949 event->param.conn.private_data_len = IB_CM_REQ_PRIVATE_DATA_SIZE - offset;
950 event->param.conn.responder_resources = req_data->responder_resources;
951 event->param.conn.initiator_depth = req_data->initiator_depth;
952 event->param.conn.flow_control = req_data->flow_control;
953 event->param.conn.retry_count = req_data->retry_count;
954 event->param.conn.rnr_retry_count = req_data->rnr_retry_count;
955 event->param.conn.srq = req_data->srq;
956 event->param.conn.qp_num = req_data->remote_qpn;
957 }
958
959 static int cma_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
960 {
961 struct rdma_id_private *listen_id, *conn_id;
962 struct rdma_cm_event event;
963 int offset, ret;
964
965 listen_id = cm_id->context;
966 atomic_inc(&listen_id->dev_remove);
967 if (!cma_comp(listen_id, CMA_LISTEN)) {
968 ret = -ECONNABORTED;
969 goto out;
970 }
971
972 memset(&event, 0, sizeof event);
973 offset = cma_user_data_offset(listen_id->id.ps);
974 event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
975 if (listen_id->id.ps == RDMA_PS_UDP) {
976 conn_id = cma_new_udp_id(&listen_id->id, ib_event);
977 event.param.ud.private_data = ib_event->private_data + offset;
978 event.param.ud.private_data_len =
979 IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE - offset;
980 } else {
981 conn_id = cma_new_conn_id(&listen_id->id, ib_event);
982 cma_set_req_event_data(&event, &ib_event->param.req_rcvd,
983 ib_event->private_data, offset);
984 }
985 if (!conn_id) {
986 ret = -ENOMEM;
987 goto out;
988 }
989
990 atomic_inc(&conn_id->dev_remove);
991 mutex_lock(&lock);
992 ret = cma_acquire_dev(conn_id);
993 mutex_unlock(&lock);
994 if (ret)
995 goto release_conn_id;
996
997 conn_id->cm_id.ib = cm_id;
998 cm_id->context = conn_id;
999 cm_id->cm_handler = cma_ib_handler;
1000
1001 ret = conn_id->id.event_handler(&conn_id->id, &event);
1002 if (!ret)
1003 goto out;
1004
1005 /* Destroy the CM ID by returning a non-zero value. */
1006 conn_id->cm_id.ib = NULL;
1007
1008 release_conn_id:
1009 cma_exch(conn_id, CMA_DESTROYING);
1010 cma_release_remove(conn_id);
1011 rdma_destroy_id(&conn_id->id);
1012
1013 out:
1014 cma_release_remove(listen_id);
1015 return ret;
1016 }
1017
1018 static __be64 cma_get_service_id(enum rdma_port_space ps, struct sockaddr *addr)
1019 {
1020 return cpu_to_be64(((u64)ps << 16) + be16_to_cpu(cma_port(addr)));
1021 }
1022
1023 static void cma_set_compare_data(enum rdma_port_space ps, struct sockaddr *addr,
1024 struct ib_cm_compare_data *compare)
1025 {
1026 struct cma_hdr *cma_data, *cma_mask;
1027 struct sdp_hh *sdp_data, *sdp_mask;
1028 __u32 ip4_addr;
1029 struct in6_addr ip6_addr;
1030
1031 memset(compare, 0, sizeof *compare);
1032 cma_data = (void *) compare->data;
1033 cma_mask = (void *) compare->mask;
1034 sdp_data = (void *) compare->data;
1035 sdp_mask = (void *) compare->mask;
1036
1037 switch (addr->sa_family) {
1038 case AF_INET:
1039 ip4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
1040 if (ps == RDMA_PS_SDP) {
1041 sdp_set_ip_ver(sdp_data, 4);
1042 sdp_set_ip_ver(sdp_mask, 0xF);
1043 sdp_data->dst_addr.ip4.addr = ip4_addr;
1044 sdp_mask->dst_addr.ip4.addr = ~0;
1045 } else {
1046 cma_set_ip_ver(cma_data, 4);
1047 cma_set_ip_ver(cma_mask, 0xF);
1048 cma_data->dst_addr.ip4.addr = ip4_addr;
1049 cma_mask->dst_addr.ip4.addr = ~0;
1050 }
1051 break;
1052 case AF_INET6:
1053 ip6_addr = ((struct sockaddr_in6 *) addr)->sin6_addr;
1054 if (ps == RDMA_PS_SDP) {
1055 sdp_set_ip_ver(sdp_data, 6);
1056 sdp_set_ip_ver(sdp_mask, 0xF);
1057 sdp_data->dst_addr.ip6 = ip6_addr;
1058 memset(&sdp_mask->dst_addr.ip6, 0xFF,
1059 sizeof sdp_mask->dst_addr.ip6);
1060 } else {
1061 cma_set_ip_ver(cma_data, 6);
1062 cma_set_ip_ver(cma_mask, 0xF);
1063 cma_data->dst_addr.ip6 = ip6_addr;
1064 memset(&cma_mask->dst_addr.ip6, 0xFF,
1065 sizeof cma_mask->dst_addr.ip6);
1066 }
1067 break;
1068 default:
1069 break;
1070 }
1071 }
1072
1073 static int cma_iw_handler(struct iw_cm_id *iw_id, struct iw_cm_event *iw_event)
1074 {
1075 struct rdma_id_private *id_priv = iw_id->context;
1076 struct rdma_cm_event event;
1077 struct sockaddr_in *sin;
1078 int ret = 0;
1079
1080 memset(&event, 0, sizeof event);
1081 atomic_inc(&id_priv->dev_remove);
1082
1083 switch (iw_event->event) {
1084 case IW_CM_EVENT_CLOSE:
1085 event.event = RDMA_CM_EVENT_DISCONNECTED;
1086 break;
1087 case IW_CM_EVENT_CONNECT_REPLY:
1088 sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
1089 *sin = iw_event->local_addr;
1090 sin = (struct sockaddr_in *) &id_priv->id.route.addr.dst_addr;
1091 *sin = iw_event->remote_addr;
1092 switch (iw_event->status) {
1093 case 0:
1094 event.event = RDMA_CM_EVENT_ESTABLISHED;
1095 break;
1096 case -ECONNRESET:
1097 case -ECONNREFUSED:
1098 event.event = RDMA_CM_EVENT_REJECTED;
1099 break;
1100 case -ETIMEDOUT:
1101 event.event = RDMA_CM_EVENT_UNREACHABLE;
1102 break;
1103 default:
1104 event.event = RDMA_CM_EVENT_CONNECT_ERROR;
1105 break;
1106 }
1107 break;
1108 case IW_CM_EVENT_ESTABLISHED:
1109 event.event = RDMA_CM_EVENT_ESTABLISHED;
1110 break;
1111 default:
1112 BUG_ON(1);
1113 }
1114
1115 event.status = iw_event->status;
1116 event.param.conn.private_data = iw_event->private_data;
1117 event.param.conn.private_data_len = iw_event->private_data_len;
1118 ret = id_priv->id.event_handler(&id_priv->id, &event);
1119 if (ret) {
1120 /* Destroy the CM ID by returning a non-zero value. */
1121 id_priv->cm_id.iw = NULL;
1122 cma_exch(id_priv, CMA_DESTROYING);
1123 cma_release_remove(id_priv);
1124 rdma_destroy_id(&id_priv->id);
1125 return ret;
1126 }
1127
1128 cma_release_remove(id_priv);
1129 return ret;
1130 }
1131
1132 static int iw_conn_req_handler(struct iw_cm_id *cm_id,
1133 struct iw_cm_event *iw_event)
1134 {
1135 struct rdma_cm_id *new_cm_id;
1136 struct rdma_id_private *listen_id, *conn_id;
1137 struct sockaddr_in *sin;
1138 struct net_device *dev = NULL;
1139 struct rdma_cm_event event;
1140 int ret;
1141
1142 listen_id = cm_id->context;
1143 atomic_inc(&listen_id->dev_remove);
1144 if (!cma_comp(listen_id, CMA_LISTEN)) {
1145 ret = -ECONNABORTED;
1146 goto out;
1147 }
1148
1149 /* Create a new RDMA id for the new IW CM ID */
1150 new_cm_id = rdma_create_id(listen_id->id.event_handler,
1151 listen_id->id.context,
1152 RDMA_PS_TCP);
1153 if (!new_cm_id) {
1154 ret = -ENOMEM;
1155 goto out;
1156 }
1157 conn_id = container_of(new_cm_id, struct rdma_id_private, id);
1158 atomic_inc(&conn_id->dev_remove);
1159 conn_id->state = CMA_CONNECT;
1160
1161 dev = ip_dev_find(iw_event->local_addr.sin_addr.s_addr);
1162 if (!dev) {
1163 ret = -EADDRNOTAVAIL;
1164 cma_release_remove(conn_id);
1165 rdma_destroy_id(new_cm_id);
1166 goto out;
1167 }
1168 ret = rdma_copy_addr(&conn_id->id.route.addr.dev_addr, dev, NULL);
1169 if (ret) {
1170 cma_release_remove(conn_id);
1171 rdma_destroy_id(new_cm_id);
1172 goto out;
1173 }
1174
1175 mutex_lock(&lock);
1176 ret = cma_acquire_dev(conn_id);
1177 mutex_unlock(&lock);
1178 if (ret) {
1179 cma_release_remove(conn_id);
1180 rdma_destroy_id(new_cm_id);
1181 goto out;
1182 }
1183
1184 conn_id->cm_id.iw = cm_id;
1185 cm_id->context = conn_id;
1186 cm_id->cm_handler = cma_iw_handler;
1187
1188 sin = (struct sockaddr_in *) &new_cm_id->route.addr.src_addr;
1189 *sin = iw_event->local_addr;
1190 sin = (struct sockaddr_in *) &new_cm_id->route.addr.dst_addr;
1191 *sin = iw_event->remote_addr;
1192
1193 memset(&event, 0, sizeof event);
1194 event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
1195 event.param.conn.private_data = iw_event->private_data;
1196 event.param.conn.private_data_len = iw_event->private_data_len;
1197 ret = conn_id->id.event_handler(&conn_id->id, &event);
1198 if (ret) {
1199 /* User wants to destroy the CM ID */
1200 conn_id->cm_id.iw = NULL;
1201 cma_exch(conn_id, CMA_DESTROYING);
1202 cma_release_remove(conn_id);
1203 rdma_destroy_id(&conn_id->id);
1204 }
1205
1206 out:
1207 if (dev)
1208 dev_put(dev);
1209 cma_release_remove(listen_id);
1210 return ret;
1211 }
1212
1213 static int cma_ib_listen(struct rdma_id_private *id_priv)
1214 {
1215 struct ib_cm_compare_data compare_data;
1216 struct sockaddr *addr;
1217 __be64 svc_id;
1218 int ret;
1219
1220 id_priv->cm_id.ib = ib_create_cm_id(id_priv->id.device, cma_req_handler,
1221 id_priv);
1222 if (IS_ERR(id_priv->cm_id.ib))
1223 return PTR_ERR(id_priv->cm_id.ib);
1224
1225 addr = &id_priv->id.route.addr.src_addr;
1226 svc_id = cma_get_service_id(id_priv->id.ps, addr);
1227 if (cma_any_addr(addr))
1228 ret = ib_cm_listen(id_priv->cm_id.ib, svc_id, 0, NULL);
1229 else {
1230 cma_set_compare_data(id_priv->id.ps, addr, &compare_data);
1231 ret = ib_cm_listen(id_priv->cm_id.ib, svc_id, 0, &compare_data);
1232 }
1233
1234 if (ret) {
1235 ib_destroy_cm_id(id_priv->cm_id.ib);
1236 id_priv->cm_id.ib = NULL;
1237 }
1238
1239 return ret;
1240 }
1241
1242 static int cma_iw_listen(struct rdma_id_private *id_priv, int backlog)
1243 {
1244 int ret;
1245 struct sockaddr_in *sin;
1246
1247 id_priv->cm_id.iw = iw_create_cm_id(id_priv->id.device,
1248 iw_conn_req_handler,
1249 id_priv);
1250 if (IS_ERR(id_priv->cm_id.iw))
1251 return PTR_ERR(id_priv->cm_id.iw);
1252
1253 sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
1254 id_priv->cm_id.iw->local_addr = *sin;
1255
1256 ret = iw_cm_listen(id_priv->cm_id.iw, backlog);
1257
1258 if (ret) {
1259 iw_destroy_cm_id(id_priv->cm_id.iw);
1260 id_priv->cm_id.iw = NULL;
1261 }
1262
1263 return ret;
1264 }
1265
1266 static int cma_listen_handler(struct rdma_cm_id *id,
1267 struct rdma_cm_event *event)
1268 {
1269 struct rdma_id_private *id_priv = id->context;
1270
1271 id->context = id_priv->id.context;
1272 id->event_handler = id_priv->id.event_handler;
1273 return id_priv->id.event_handler(id, event);
1274 }
1275
1276 static void cma_listen_on_dev(struct rdma_id_private *id_priv,
1277 struct cma_device *cma_dev)
1278 {
1279 struct rdma_id_private *dev_id_priv;
1280 struct rdma_cm_id *id;
1281 int ret;
1282
1283 id = rdma_create_id(cma_listen_handler, id_priv, id_priv->id.ps);
1284 if (IS_ERR(id))
1285 return;
1286
1287 dev_id_priv = container_of(id, struct rdma_id_private, id);
1288
1289 dev_id_priv->state = CMA_ADDR_BOUND;
1290 memcpy(&id->route.addr.src_addr, &id_priv->id.route.addr.src_addr,
1291 ip_addr_size(&id_priv->id.route.addr.src_addr));
1292
1293 cma_attach_to_dev(dev_id_priv, cma_dev);
1294 list_add_tail(&dev_id_priv->listen_list, &id_priv->listen_list);
1295
1296 ret = rdma_listen(id, id_priv->backlog);
1297 if (ret)
1298 goto err;
1299
1300 return;
1301 err:
1302 cma_destroy_listen(dev_id_priv);
1303 }
1304
1305 static void cma_listen_on_all(struct rdma_id_private *id_priv)
1306 {
1307 struct cma_device *cma_dev;
1308
1309 mutex_lock(&lock);
1310 list_add_tail(&id_priv->list, &listen_any_list);
1311 list_for_each_entry(cma_dev, &dev_list, list)
1312 cma_listen_on_dev(id_priv, cma_dev);
1313 mutex_unlock(&lock);
1314 }
1315
1316 static int cma_bind_any(struct rdma_cm_id *id, sa_family_t af)
1317 {
1318 struct sockaddr_in addr_in;
1319
1320 memset(&addr_in, 0, sizeof addr_in);
1321 addr_in.sin_family = af;
1322 return rdma_bind_addr(id, (struct sockaddr *) &addr_in);
1323 }
1324
1325 int rdma_listen(struct rdma_cm_id *id, int backlog)
1326 {
1327 struct rdma_id_private *id_priv;
1328 int ret;
1329
1330 id_priv = container_of(id, struct rdma_id_private, id);
1331 if (id_priv->state == CMA_IDLE) {
1332 ret = cma_bind_any(id, AF_INET);
1333 if (ret)
1334 return ret;
1335 }
1336
1337 if (!cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_LISTEN))
1338 return -EINVAL;
1339
1340 id_priv->backlog = backlog;
1341 if (id->device) {
1342 switch (rdma_node_get_transport(id->device->node_type)) {
1343 case RDMA_TRANSPORT_IB:
1344 ret = cma_ib_listen(id_priv);
1345 if (ret)
1346 goto err;
1347 break;
1348 case RDMA_TRANSPORT_IWARP:
1349 ret = cma_iw_listen(id_priv, backlog);
1350 if (ret)
1351 goto err;
1352 break;
1353 default:
1354 ret = -ENOSYS;
1355 goto err;
1356 }
1357 } else
1358 cma_listen_on_all(id_priv);
1359
1360 return 0;
1361 err:
1362 id_priv->backlog = 0;
1363 cma_comp_exch(id_priv, CMA_LISTEN, CMA_ADDR_BOUND);
1364 return ret;
1365 }
1366 EXPORT_SYMBOL(rdma_listen);
1367
1368 static void cma_query_handler(int status, struct ib_sa_path_rec *path_rec,
1369 void *context)
1370 {
1371 struct cma_work *work = context;
1372 struct rdma_route *route;
1373
1374 route = &work->id->id.route;
1375
1376 if (!status) {
1377 route->num_paths = 1;
1378 *route->path_rec = *path_rec;
1379 } else {
1380 work->old_state = CMA_ROUTE_QUERY;
1381 work->new_state = CMA_ADDR_RESOLVED;
1382 work->event.event = RDMA_CM_EVENT_ROUTE_ERROR;
1383 work->event.status = status;
1384 }
1385
1386 queue_work(cma_wq, &work->work);
1387 }
1388
1389 static int cma_query_ib_route(struct rdma_id_private *id_priv, int timeout_ms,
1390 struct cma_work *work)
1391 {
1392 struct rdma_dev_addr *addr = &id_priv->id.route.addr.dev_addr;
1393 struct ib_sa_path_rec path_rec;
1394
1395 memset(&path_rec, 0, sizeof path_rec);
1396 ib_addr_get_sgid(addr, &path_rec.sgid);
1397 ib_addr_get_dgid(addr, &path_rec.dgid);
1398 path_rec.pkey = cpu_to_be16(ib_addr_get_pkey(addr));
1399 path_rec.numb_path = 1;
1400
1401 id_priv->query_id = ib_sa_path_rec_get(&sa_client, id_priv->id.device,
1402 id_priv->id.port_num, &path_rec,
1403 IB_SA_PATH_REC_DGID | IB_SA_PATH_REC_SGID |
1404 IB_SA_PATH_REC_PKEY | IB_SA_PATH_REC_NUMB_PATH,
1405 timeout_ms, GFP_KERNEL,
1406 cma_query_handler, work, &id_priv->query);
1407
1408 return (id_priv->query_id < 0) ? id_priv->query_id : 0;
1409 }
1410
1411 static void cma_work_handler(struct work_struct *_work)
1412 {
1413 struct cma_work *work = container_of(_work, struct cma_work, work);
1414 struct rdma_id_private *id_priv = work->id;
1415 int destroy = 0;
1416
1417 atomic_inc(&id_priv->dev_remove);
1418 if (!cma_comp_exch(id_priv, work->old_state, work->new_state))
1419 goto out;
1420
1421 if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
1422 cma_exch(id_priv, CMA_DESTROYING);
1423 destroy = 1;
1424 }
1425 out:
1426 cma_release_remove(id_priv);
1427 cma_deref_id(id_priv);
1428 if (destroy)
1429 rdma_destroy_id(&id_priv->id);
1430 kfree(work);
1431 }
1432
1433 static int cma_resolve_ib_route(struct rdma_id_private *id_priv, int timeout_ms)
1434 {
1435 struct rdma_route *route = &id_priv->id.route;
1436 struct cma_work *work;
1437 int ret;
1438
1439 work = kzalloc(sizeof *work, GFP_KERNEL);
1440 if (!work)
1441 return -ENOMEM;
1442
1443 work->id = id_priv;
1444 INIT_WORK(&work->work, cma_work_handler);
1445 work->old_state = CMA_ROUTE_QUERY;
1446 work->new_state = CMA_ROUTE_RESOLVED;
1447 work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
1448
1449 route->path_rec = kmalloc(sizeof *route->path_rec, GFP_KERNEL);
1450 if (!route->path_rec) {
1451 ret = -ENOMEM;
1452 goto err1;
1453 }
1454
1455 ret = cma_query_ib_route(id_priv, timeout_ms, work);
1456 if (ret)
1457 goto err2;
1458
1459 return 0;
1460 err2:
1461 kfree(route->path_rec);
1462 route->path_rec = NULL;
1463 err1:
1464 kfree(work);
1465 return ret;
1466 }
1467
1468 int rdma_set_ib_paths(struct rdma_cm_id *id,
1469 struct ib_sa_path_rec *path_rec, int num_paths)
1470 {
1471 struct rdma_id_private *id_priv;
1472 int ret;
1473
1474 id_priv = container_of(id, struct rdma_id_private, id);
1475 if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ROUTE_RESOLVED))
1476 return -EINVAL;
1477
1478 id->route.path_rec = kmalloc(sizeof *path_rec * num_paths, GFP_KERNEL);
1479 if (!id->route.path_rec) {
1480 ret = -ENOMEM;
1481 goto err;
1482 }
1483
1484 memcpy(id->route.path_rec, path_rec, sizeof *path_rec * num_paths);
1485 return 0;
1486 err:
1487 cma_comp_exch(id_priv, CMA_ROUTE_RESOLVED, CMA_ADDR_RESOLVED);
1488 return ret;
1489 }
1490 EXPORT_SYMBOL(rdma_set_ib_paths);
1491
1492 static int cma_resolve_iw_route(struct rdma_id_private *id_priv, int timeout_ms)
1493 {
1494 struct cma_work *work;
1495
1496 work = kzalloc(sizeof *work, GFP_KERNEL);
1497 if (!work)
1498 return -ENOMEM;
1499
1500 work->id = id_priv;
1501 INIT_WORK(&work->work, cma_work_handler);
1502 work->old_state = CMA_ROUTE_QUERY;
1503 work->new_state = CMA_ROUTE_RESOLVED;
1504 work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
1505 queue_work(cma_wq, &work->work);
1506 return 0;
1507 }
1508
1509 int rdma_resolve_route(struct rdma_cm_id *id, int timeout_ms)
1510 {
1511 struct rdma_id_private *id_priv;
1512 int ret;
1513
1514 id_priv = container_of(id, struct rdma_id_private, id);
1515 if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ROUTE_QUERY))
1516 return -EINVAL;
1517
1518 atomic_inc(&id_priv->refcount);
1519 switch (rdma_node_get_transport(id->device->node_type)) {
1520 case RDMA_TRANSPORT_IB:
1521 ret = cma_resolve_ib_route(id_priv, timeout_ms);
1522 break;
1523 case RDMA_TRANSPORT_IWARP:
1524 ret = cma_resolve_iw_route(id_priv, timeout_ms);
1525 break;
1526 default:
1527 ret = -ENOSYS;
1528 break;
1529 }
1530 if (ret)
1531 goto err;
1532
1533 return 0;
1534 err:
1535 cma_comp_exch(id_priv, CMA_ROUTE_QUERY, CMA_ADDR_RESOLVED);
1536 cma_deref_id(id_priv);
1537 return ret;
1538 }
1539 EXPORT_SYMBOL(rdma_resolve_route);
1540
1541 static int cma_bind_loopback(struct rdma_id_private *id_priv)
1542 {
1543 struct cma_device *cma_dev;
1544 struct ib_port_attr port_attr;
1545 union ib_gid gid;
1546 u16 pkey;
1547 int ret;
1548 u8 p;
1549
1550 mutex_lock(&lock);
1551 if (list_empty(&dev_list)) {
1552 ret = -ENODEV;
1553 goto out;
1554 }
1555 list_for_each_entry(cma_dev, &dev_list, list)
1556 for (p = 1; p <= cma_dev->device->phys_port_cnt; ++p)
1557 if (!ib_query_port(cma_dev->device, p, &port_attr) &&
1558 port_attr.state == IB_PORT_ACTIVE)
1559 goto port_found;
1560
1561 p = 1;
1562 cma_dev = list_entry(dev_list.next, struct cma_device, list);
1563
1564 port_found:
1565 ret = ib_get_cached_gid(cma_dev->device, p, 0, &gid);
1566 if (ret)
1567 goto out;
1568
1569 ret = ib_get_cached_pkey(cma_dev->device, p, 0, &pkey);
1570 if (ret)
1571 goto out;
1572
1573 ib_addr_set_sgid(&id_priv->id.route.addr.dev_addr, &gid);
1574 ib_addr_set_pkey(&id_priv->id.route.addr.dev_addr, pkey);
1575 id_priv->id.port_num = p;
1576 cma_attach_to_dev(id_priv, cma_dev);
1577 out:
1578 mutex_unlock(&lock);
1579 return ret;
1580 }
1581
1582 static void addr_handler(int status, struct sockaddr *src_addr,
1583 struct rdma_dev_addr *dev_addr, void *context)
1584 {
1585 struct rdma_id_private *id_priv = context;
1586 struct rdma_cm_event event;
1587
1588 memset(&event, 0, sizeof event);
1589 atomic_inc(&id_priv->dev_remove);
1590
1591 /*
1592 * Grab mutex to block rdma_destroy_id() from removing the device while
1593 * we're trying to acquire it.
1594 */
1595 mutex_lock(&lock);
1596 if (!cma_comp_exch(id_priv, CMA_ADDR_QUERY, CMA_ADDR_RESOLVED)) {
1597 mutex_unlock(&lock);
1598 goto out;
1599 }
1600
1601 if (!status && !id_priv->cma_dev)
1602 status = cma_acquire_dev(id_priv);
1603 mutex_unlock(&lock);
1604
1605 if (status) {
1606 if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ADDR_BOUND))
1607 goto out;
1608 event.event = RDMA_CM_EVENT_ADDR_ERROR;
1609 event.status = status;
1610 } else {
1611 memcpy(&id_priv->id.route.addr.src_addr, src_addr,
1612 ip_addr_size(src_addr));
1613 event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
1614 }
1615
1616 if (id_priv->id.event_handler(&id_priv->id, &event)) {
1617 cma_exch(id_priv, CMA_DESTROYING);
1618 cma_release_remove(id_priv);
1619 cma_deref_id(id_priv);
1620 rdma_destroy_id(&id_priv->id);
1621 return;
1622 }
1623 out:
1624 cma_release_remove(id_priv);
1625 cma_deref_id(id_priv);
1626 }
1627
1628 static int cma_resolve_loopback(struct rdma_id_private *id_priv)
1629 {
1630 struct cma_work *work;
1631 struct sockaddr_in *src_in, *dst_in;
1632 union ib_gid gid;
1633 int ret;
1634
1635 work = kzalloc(sizeof *work, GFP_KERNEL);
1636 if (!work)
1637 return -ENOMEM;
1638
1639 if (!id_priv->cma_dev) {
1640 ret = cma_bind_loopback(id_priv);
1641 if (ret)
1642 goto err;
1643 }
1644
1645 ib_addr_get_sgid(&id_priv->id.route.addr.dev_addr, &gid);
1646 ib_addr_set_dgid(&id_priv->id.route.addr.dev_addr, &gid);
1647
1648 if (cma_zero_addr(&id_priv->id.route.addr.src_addr)) {
1649 src_in = (struct sockaddr_in *)&id_priv->id.route.addr.src_addr;
1650 dst_in = (struct sockaddr_in *)&id_priv->id.route.addr.dst_addr;
1651 src_in->sin_family = dst_in->sin_family;
1652 src_in->sin_addr.s_addr = dst_in->sin_addr.s_addr;
1653 }
1654
1655 work->id = id_priv;
1656 INIT_WORK(&work->work, cma_work_handler);
1657 work->old_state = CMA_ADDR_QUERY;
1658 work->new_state = CMA_ADDR_RESOLVED;
1659 work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
1660 queue_work(cma_wq, &work->work);
1661 return 0;
1662 err:
1663 kfree(work);
1664 return ret;
1665 }
1666
1667 static int cma_bind_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
1668 struct sockaddr *dst_addr)
1669 {
1670 if (src_addr && src_addr->sa_family)
1671 return rdma_bind_addr(id, src_addr);
1672 else
1673 return cma_bind_any(id, dst_addr->sa_family);
1674 }
1675
1676 int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
1677 struct sockaddr *dst_addr, int timeout_ms)
1678 {
1679 struct rdma_id_private *id_priv;
1680 int ret;
1681
1682 id_priv = container_of(id, struct rdma_id_private, id);
1683 if (id_priv->state == CMA_IDLE) {
1684 ret = cma_bind_addr(id, src_addr, dst_addr);
1685 if (ret)
1686 return ret;
1687 }
1688
1689 if (!cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_ADDR_QUERY))
1690 return -EINVAL;
1691
1692 atomic_inc(&id_priv->refcount);
1693 memcpy(&id->route.addr.dst_addr, dst_addr, ip_addr_size(dst_addr));
1694 if (cma_any_addr(dst_addr))
1695 ret = cma_resolve_loopback(id_priv);
1696 else
1697 ret = rdma_resolve_ip(&addr_client, &id->route.addr.src_addr,
1698 dst_addr, &id->route.addr.dev_addr,
1699 timeout_ms, addr_handler, id_priv);
1700 if (ret)
1701 goto err;
1702
1703 return 0;
1704 err:
1705 cma_comp_exch(id_priv, CMA_ADDR_QUERY, CMA_ADDR_BOUND);
1706 cma_deref_id(id_priv);
1707 return ret;
1708 }
1709 EXPORT_SYMBOL(rdma_resolve_addr);
1710
1711 static void cma_bind_port(struct rdma_bind_list *bind_list,
1712 struct rdma_id_private *id_priv)
1713 {
1714 struct sockaddr_in *sin;
1715
1716 sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
1717 sin->sin_port = htons(bind_list->port);
1718 id_priv->bind_list = bind_list;
1719 hlist_add_head(&id_priv->node, &bind_list->owners);
1720 }
1721
1722 static int cma_alloc_port(struct idr *ps, struct rdma_id_private *id_priv,
1723 unsigned short snum)
1724 {
1725 struct rdma_bind_list *bind_list;
1726 int port, ret;
1727
1728 bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL);
1729 if (!bind_list)
1730 return -ENOMEM;
1731
1732 do {
1733 ret = idr_get_new_above(ps, bind_list, snum, &port);
1734 } while ((ret == -EAGAIN) && idr_pre_get(ps, GFP_KERNEL));
1735
1736 if (ret)
1737 goto err1;
1738
1739 if (port != snum) {
1740 ret = -EADDRNOTAVAIL;
1741 goto err2;
1742 }
1743
1744 bind_list->ps = ps;
1745 bind_list->port = (unsigned short) port;
1746 cma_bind_port(bind_list, id_priv);
1747 return 0;
1748 err2:
1749 idr_remove(ps, port);
1750 err1:
1751 kfree(bind_list);
1752 return ret;
1753 }
1754
1755 static int cma_alloc_any_port(struct idr *ps, struct rdma_id_private *id_priv)
1756 {
1757 struct rdma_bind_list *bind_list;
1758 int port, ret;
1759
1760 bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL);
1761 if (!bind_list)
1762 return -ENOMEM;
1763
1764 retry:
1765 do {
1766 ret = idr_get_new_above(ps, bind_list, next_port, &port);
1767 } while ((ret == -EAGAIN) && idr_pre_get(ps, GFP_KERNEL));
1768
1769 if (ret)
1770 goto err1;
1771
1772 if (port > sysctl_local_port_range[1]) {
1773 if (next_port != sysctl_local_port_range[0]) {
1774 idr_remove(ps, port);
1775 next_port = sysctl_local_port_range[0];
1776 goto retry;
1777 }
1778 ret = -EADDRNOTAVAIL;
1779 goto err2;
1780 }
1781
1782 if (port == sysctl_local_port_range[1])
1783 next_port = sysctl_local_port_range[0];
1784 else
1785 next_port = port + 1;
1786
1787 bind_list->ps = ps;
1788 bind_list->port = (unsigned short) port;
1789 cma_bind_port(bind_list, id_priv);
1790 return 0;
1791 err2:
1792 idr_remove(ps, port);
1793 err1:
1794 kfree(bind_list);
1795 return ret;
1796 }
1797
1798 static int cma_use_port(struct idr *ps, struct rdma_id_private *id_priv)
1799 {
1800 struct rdma_id_private *cur_id;
1801 struct sockaddr_in *sin, *cur_sin;
1802 struct rdma_bind_list *bind_list;
1803 struct hlist_node *node;
1804 unsigned short snum;
1805
1806 sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
1807 snum = ntohs(sin->sin_port);
1808 if (snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
1809 return -EACCES;
1810
1811 bind_list = idr_find(ps, snum);
1812 if (!bind_list)
1813 return cma_alloc_port(ps, id_priv, snum);
1814
1815 /*
1816 * We don't support binding to any address if anyone is bound to
1817 * a specific address on the same port.
1818 */
1819 if (cma_any_addr(&id_priv->id.route.addr.src_addr))
1820 return -EADDRNOTAVAIL;
1821
1822 hlist_for_each_entry(cur_id, node, &bind_list->owners, node) {
1823 if (cma_any_addr(&cur_id->id.route.addr.src_addr))
1824 return -EADDRNOTAVAIL;
1825
1826 cur_sin = (struct sockaddr_in *) &cur_id->id.route.addr.src_addr;
1827 if (sin->sin_addr.s_addr == cur_sin->sin_addr.s_addr)
1828 return -EADDRINUSE;
1829 }
1830
1831 cma_bind_port(bind_list, id_priv);
1832 return 0;
1833 }
1834
1835 static int cma_get_port(struct rdma_id_private *id_priv)
1836 {
1837 struct idr *ps;
1838 int ret;
1839
1840 switch (id_priv->id.ps) {
1841 case RDMA_PS_SDP:
1842 ps = &sdp_ps;
1843 break;
1844 case RDMA_PS_TCP:
1845 ps = &tcp_ps;
1846 break;
1847 case RDMA_PS_UDP:
1848 ps = &udp_ps;
1849 break;
1850 default:
1851 return -EPROTONOSUPPORT;
1852 }
1853
1854 mutex_lock(&lock);
1855 if (cma_any_port(&id_priv->id.route.addr.src_addr))
1856 ret = cma_alloc_any_port(ps, id_priv);
1857 else
1858 ret = cma_use_port(ps, id_priv);
1859 mutex_unlock(&lock);
1860
1861 return ret;
1862 }
1863
1864 int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr)
1865 {
1866 struct rdma_id_private *id_priv;
1867 int ret;
1868
1869 if (addr->sa_family != AF_INET)
1870 return -EAFNOSUPPORT;
1871
1872 id_priv = container_of(id, struct rdma_id_private, id);
1873 if (!cma_comp_exch(id_priv, CMA_IDLE, CMA_ADDR_BOUND))
1874 return -EINVAL;
1875
1876 if (!cma_any_addr(addr)) {
1877 ret = rdma_translate_ip(addr, &id->route.addr.dev_addr);
1878 if (ret)
1879 goto err1;
1880
1881 mutex_lock(&lock);
1882 ret = cma_acquire_dev(id_priv);
1883 mutex_unlock(&lock);
1884 if (ret)
1885 goto err1;
1886 }
1887
1888 memcpy(&id->route.addr.src_addr, addr, ip_addr_size(addr));
1889 ret = cma_get_port(id_priv);
1890 if (ret)
1891 goto err2;
1892
1893 return 0;
1894 err2:
1895 if (!cma_any_addr(addr)) {
1896 mutex_lock(&lock);
1897 cma_detach_from_dev(id_priv);
1898 mutex_unlock(&lock);
1899 }
1900 err1:
1901 cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_IDLE);
1902 return ret;
1903 }
1904 EXPORT_SYMBOL(rdma_bind_addr);
1905
1906 static int cma_format_hdr(void *hdr, enum rdma_port_space ps,
1907 struct rdma_route *route)
1908 {
1909 struct sockaddr_in *src4, *dst4;
1910 struct cma_hdr *cma_hdr;
1911 struct sdp_hh *sdp_hdr;
1912
1913 src4 = (struct sockaddr_in *) &route->addr.src_addr;
1914 dst4 = (struct sockaddr_in *) &route->addr.dst_addr;
1915
1916 switch (ps) {
1917 case RDMA_PS_SDP:
1918 sdp_hdr = hdr;
1919 if (sdp_get_majv(sdp_hdr->sdp_version) != SDP_MAJ_VERSION)
1920 return -EINVAL;
1921 sdp_set_ip_ver(sdp_hdr, 4);
1922 sdp_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
1923 sdp_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
1924 sdp_hdr->port = src4->sin_port;
1925 break;
1926 default:
1927 cma_hdr = hdr;
1928 cma_hdr->cma_version = CMA_VERSION;
1929 cma_set_ip_ver(cma_hdr, 4);
1930 cma_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
1931 cma_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
1932 cma_hdr->port = src4->sin_port;
1933 break;
1934 }
1935 return 0;
1936 }
1937
1938 static int cma_sidr_rep_handler(struct ib_cm_id *cm_id,
1939 struct ib_cm_event *ib_event)
1940 {
1941 struct rdma_id_private *id_priv = cm_id->context;
1942 struct rdma_cm_event event;
1943 struct ib_cm_sidr_rep_event_param *rep = &ib_event->param.sidr_rep_rcvd;
1944 int ret = 0;
1945
1946 memset(&event, 0, sizeof event);
1947 atomic_inc(&id_priv->dev_remove);
1948 if (!cma_comp(id_priv, CMA_CONNECT))
1949 goto out;
1950
1951 switch (ib_event->event) {
1952 case IB_CM_SIDR_REQ_ERROR:
1953 event.event = RDMA_CM_EVENT_UNREACHABLE;
1954 event.status = -ETIMEDOUT;
1955 break;
1956 case IB_CM_SIDR_REP_RECEIVED:
1957 event.param.ud.private_data = ib_event->private_data;
1958 event.param.ud.private_data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
1959 if (rep->status != IB_SIDR_SUCCESS) {
1960 event.event = RDMA_CM_EVENT_UNREACHABLE;
1961 event.status = ib_event->param.sidr_rep_rcvd.status;
1962 break;
1963 }
1964 if (rep->qkey != RDMA_UD_QKEY) {
1965 event.event = RDMA_CM_EVENT_UNREACHABLE;
1966 event.status = -EINVAL;
1967 break;
1968 }
1969 ib_init_ah_from_path(id_priv->id.device, id_priv->id.port_num,
1970 id_priv->id.route.path_rec,
1971 &event.param.ud.ah_attr);
1972 event.param.ud.qp_num = rep->qpn;
1973 event.param.ud.qkey = rep->qkey;
1974 event.event = RDMA_CM_EVENT_ESTABLISHED;
1975 event.status = 0;
1976 break;
1977 default:
1978 printk(KERN_ERR "RDMA CMA: unexpected IB CM event: %d",
1979 ib_event->event);
1980 goto out;
1981 }
1982
1983 ret = id_priv->id.event_handler(&id_priv->id, &event);
1984 if (ret) {
1985 /* Destroy the CM ID by returning a non-zero value. */
1986 id_priv->cm_id.ib = NULL;
1987 cma_exch(id_priv, CMA_DESTROYING);
1988 cma_release_remove(id_priv);
1989 rdma_destroy_id(&id_priv->id);
1990 return ret;
1991 }
1992 out:
1993 cma_release_remove(id_priv);
1994 return ret;
1995 }
1996
1997 static int cma_resolve_ib_udp(struct rdma_id_private *id_priv,
1998 struct rdma_conn_param *conn_param)
1999 {
2000 struct ib_cm_sidr_req_param req;
2001 struct rdma_route *route;
2002 int ret;
2003
2004 req.private_data_len = sizeof(struct cma_hdr) +
2005 conn_param->private_data_len;
2006 req.private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
2007 if (!req.private_data)
2008 return -ENOMEM;
2009
2010 if (conn_param->private_data && conn_param->private_data_len)
2011 memcpy((void *) req.private_data + sizeof(struct cma_hdr),
2012 conn_param->private_data, conn_param->private_data_len);
2013
2014 route = &id_priv->id.route;
2015 ret = cma_format_hdr((void *) req.private_data, id_priv->id.ps, route);
2016 if (ret)
2017 goto out;
2018
2019 id_priv->cm_id.ib = ib_create_cm_id(id_priv->id.device,
2020 cma_sidr_rep_handler, id_priv);
2021 if (IS_ERR(id_priv->cm_id.ib)) {
2022 ret = PTR_ERR(id_priv->cm_id.ib);
2023 goto out;
2024 }
2025
2026 req.path = route->path_rec;
2027 req.service_id = cma_get_service_id(id_priv->id.ps,
2028 &route->addr.dst_addr);
2029 req.timeout_ms = 1 << (CMA_CM_RESPONSE_TIMEOUT - 8);
2030 req.max_cm_retries = CMA_MAX_CM_RETRIES;
2031
2032 ret = ib_send_cm_sidr_req(id_priv->cm_id.ib, &req);
2033 if (ret) {
2034 ib_destroy_cm_id(id_priv->cm_id.ib);
2035 id_priv->cm_id.ib = NULL;
2036 }
2037 out:
2038 kfree(req.private_data);
2039 return ret;
2040 }
2041
2042 static int cma_connect_ib(struct rdma_id_private *id_priv,
2043 struct rdma_conn_param *conn_param)
2044 {
2045 struct ib_cm_req_param req;
2046 struct rdma_route *route;
2047 void *private_data;
2048 int offset, ret;
2049
2050 memset(&req, 0, sizeof req);
2051 offset = cma_user_data_offset(id_priv->id.ps);
2052 req.private_data_len = offset + conn_param->private_data_len;
2053 private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
2054 if (!private_data)
2055 return -ENOMEM;
2056
2057 if (conn_param->private_data && conn_param->private_data_len)
2058 memcpy(private_data + offset, conn_param->private_data,
2059 conn_param->private_data_len);
2060
2061 id_priv->cm_id.ib = ib_create_cm_id(id_priv->id.device, cma_ib_handler,
2062 id_priv);
2063 if (IS_ERR(id_priv->cm_id.ib)) {
2064 ret = PTR_ERR(id_priv->cm_id.ib);
2065 goto out;
2066 }
2067
2068 route = &id_priv->id.route;
2069 ret = cma_format_hdr(private_data, id_priv->id.ps, route);
2070 if (ret)
2071 goto out;
2072 req.private_data = private_data;
2073
2074 req.primary_path = &route->path_rec[0];
2075 if (route->num_paths == 2)
2076 req.alternate_path = &route->path_rec[1];
2077
2078 req.service_id = cma_get_service_id(id_priv->id.ps,
2079 &route->addr.dst_addr);
2080 req.qp_num = id_priv->qp_num;
2081 req.qp_type = IB_QPT_RC;
2082 req.starting_psn = id_priv->seq_num;
2083 req.responder_resources = conn_param->responder_resources;
2084 req.initiator_depth = conn_param->initiator_depth;
2085 req.flow_control = conn_param->flow_control;
2086 req.retry_count = conn_param->retry_count;
2087 req.rnr_retry_count = conn_param->rnr_retry_count;
2088 req.remote_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
2089 req.local_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
2090 req.max_cm_retries = CMA_MAX_CM_RETRIES;
2091 req.srq = id_priv->srq ? 1 : 0;
2092
2093 ret = ib_send_cm_req(id_priv->cm_id.ib, &req);
2094 out:
2095 if (ret && !IS_ERR(id_priv->cm_id.ib)) {
2096 ib_destroy_cm_id(id_priv->cm_id.ib);
2097 id_priv->cm_id.ib = NULL;
2098 }
2099
2100 kfree(private_data);
2101 return ret;
2102 }
2103
2104 static int cma_connect_iw(struct rdma_id_private *id_priv,
2105 struct rdma_conn_param *conn_param)
2106 {
2107 struct iw_cm_id *cm_id;
2108 struct sockaddr_in* sin;
2109 int ret;
2110 struct iw_cm_conn_param iw_param;
2111
2112 cm_id = iw_create_cm_id(id_priv->id.device, cma_iw_handler, id_priv);
2113 if (IS_ERR(cm_id)) {
2114 ret = PTR_ERR(cm_id);
2115 goto out;
2116 }
2117
2118 id_priv->cm_id.iw = cm_id;
2119
2120 sin = (struct sockaddr_in*) &id_priv->id.route.addr.src_addr;
2121 cm_id->local_addr = *sin;
2122
2123 sin = (struct sockaddr_in*) &id_priv->id.route.addr.dst_addr;
2124 cm_id->remote_addr = *sin;
2125
2126 ret = cma_modify_qp_rtr(&id_priv->id);
2127 if (ret)
2128 goto out;
2129
2130 iw_param.ord = conn_param->initiator_depth;
2131 iw_param.ird = conn_param->responder_resources;
2132 iw_param.private_data = conn_param->private_data;
2133 iw_param.private_data_len = conn_param->private_data_len;
2134 if (id_priv->id.qp)
2135 iw_param.qpn = id_priv->qp_num;
2136 else
2137 iw_param.qpn = conn_param->qp_num;
2138 ret = iw_cm_connect(cm_id, &iw_param);
2139 out:
2140 if (ret && !IS_ERR(cm_id)) {
2141 iw_destroy_cm_id(cm_id);
2142 id_priv->cm_id.iw = NULL;
2143 }
2144 return ret;
2145 }
2146
2147 int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
2148 {
2149 struct rdma_id_private *id_priv;
2150 int ret;
2151
2152 id_priv = container_of(id, struct rdma_id_private, id);
2153 if (!cma_comp_exch(id_priv, CMA_ROUTE_RESOLVED, CMA_CONNECT))
2154 return -EINVAL;
2155
2156 if (!id->qp) {
2157 id_priv->qp_num = conn_param->qp_num;
2158 id_priv->srq = conn_param->srq;
2159 }
2160
2161 switch (rdma_node_get_transport(id->device->node_type)) {
2162 case RDMA_TRANSPORT_IB:
2163 if (id->ps == RDMA_PS_UDP)
2164 ret = cma_resolve_ib_udp(id_priv, conn_param);
2165 else
2166 ret = cma_connect_ib(id_priv, conn_param);
2167 break;
2168 case RDMA_TRANSPORT_IWARP:
2169 ret = cma_connect_iw(id_priv, conn_param);
2170 break;
2171 default:
2172 ret = -ENOSYS;
2173 break;
2174 }
2175 if (ret)
2176 goto err;
2177
2178 return 0;
2179 err:
2180 cma_comp_exch(id_priv, CMA_CONNECT, CMA_ROUTE_RESOLVED);
2181 return ret;
2182 }
2183 EXPORT_SYMBOL(rdma_connect);
2184
2185 static int cma_accept_ib(struct rdma_id_private *id_priv,
2186 struct rdma_conn_param *conn_param)
2187 {
2188 struct ib_cm_rep_param rep;
2189 struct ib_qp_attr qp_attr;
2190 int qp_attr_mask, ret;
2191
2192 if (id_priv->id.qp) {
2193 ret = cma_modify_qp_rtr(&id_priv->id);
2194 if (ret)
2195 goto out;
2196
2197 qp_attr.qp_state = IB_QPS_RTS;
2198 ret = ib_cm_init_qp_attr(id_priv->cm_id.ib, &qp_attr,
2199 &qp_attr_mask);
2200 if (ret)
2201 goto out;
2202
2203 qp_attr.max_rd_atomic = conn_param->initiator_depth;
2204 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
2205 if (ret)
2206 goto out;
2207 }
2208
2209 memset(&rep, 0, sizeof rep);
2210 rep.qp_num = id_priv->qp_num;
2211 rep.starting_psn = id_priv->seq_num;
2212 rep.private_data = conn_param->private_data;
2213 rep.private_data_len = conn_param->private_data_len;
2214 rep.responder_resources = conn_param->responder_resources;
2215 rep.initiator_depth = conn_param->initiator_depth;
2216 rep.target_ack_delay = CMA_CM_RESPONSE_TIMEOUT;
2217 rep.failover_accepted = 0;
2218 rep.flow_control = conn_param->flow_control;
2219 rep.rnr_retry_count = conn_param->rnr_retry_count;
2220 rep.srq = id_priv->srq ? 1 : 0;
2221
2222 ret = ib_send_cm_rep(id_priv->cm_id.ib, &rep);
2223 out:
2224 return ret;
2225 }
2226
2227 static int cma_accept_iw(struct rdma_id_private *id_priv,
2228 struct rdma_conn_param *conn_param)
2229 {
2230 struct iw_cm_conn_param iw_param;
2231 int ret;
2232
2233 ret = cma_modify_qp_rtr(&id_priv->id);
2234 if (ret)
2235 return ret;
2236
2237 iw_param.ord = conn_param->initiator_depth;
2238 iw_param.ird = conn_param->responder_resources;
2239 iw_param.private_data = conn_param->private_data;
2240 iw_param.private_data_len = conn_param->private_data_len;
2241 if (id_priv->id.qp) {
2242 iw_param.qpn = id_priv->qp_num;
2243 } else
2244 iw_param.qpn = conn_param->qp_num;
2245
2246 return iw_cm_accept(id_priv->cm_id.iw, &iw_param);
2247 }
2248
2249 static int cma_send_sidr_rep(struct rdma_id_private *id_priv,
2250 enum ib_cm_sidr_status status,
2251 const void *private_data, int private_data_len)
2252 {
2253 struct ib_cm_sidr_rep_param rep;
2254
2255 memset(&rep, 0, sizeof rep);
2256 rep.status = status;
2257 if (status == IB_SIDR_SUCCESS) {
2258 rep.qp_num = id_priv->qp_num;
2259 rep.qkey = RDMA_UD_QKEY;
2260 }
2261 rep.private_data = private_data;
2262 rep.private_data_len = private_data_len;
2263
2264 return ib_send_cm_sidr_rep(id_priv->cm_id.ib, &rep);
2265 }
2266
2267 int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
2268 {
2269 struct rdma_id_private *id_priv;
2270 int ret;
2271
2272 id_priv = container_of(id, struct rdma_id_private, id);
2273 if (!cma_comp(id_priv, CMA_CONNECT))
2274 return -EINVAL;
2275
2276 if (!id->qp && conn_param) {
2277 id_priv->qp_num = conn_param->qp_num;
2278 id_priv->srq = conn_param->srq;
2279 }
2280
2281 switch (rdma_node_get_transport(id->device->node_type)) {
2282 case RDMA_TRANSPORT_IB:
2283 if (id->ps == RDMA_PS_UDP)
2284 ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
2285 conn_param->private_data,
2286 conn_param->private_data_len);
2287 else if (conn_param)
2288 ret = cma_accept_ib(id_priv, conn_param);
2289 else
2290 ret = cma_rep_recv(id_priv);
2291 break;
2292 case RDMA_TRANSPORT_IWARP:
2293 ret = cma_accept_iw(id_priv, conn_param);
2294 break;
2295 default:
2296 ret = -ENOSYS;
2297 break;
2298 }
2299
2300 if (ret)
2301 goto reject;
2302
2303 return 0;
2304 reject:
2305 cma_modify_qp_err(id);
2306 rdma_reject(id, NULL, 0);
2307 return ret;
2308 }
2309 EXPORT_SYMBOL(rdma_accept);
2310
2311 int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event)
2312 {
2313 struct rdma_id_private *id_priv;
2314 int ret;
2315
2316 id_priv = container_of(id, struct rdma_id_private, id);
2317 if (!cma_comp(id_priv, CMA_CONNECT))
2318 return -EINVAL;
2319
2320 switch (id->device->node_type) {
2321 case RDMA_NODE_IB_CA:
2322 ret = ib_cm_notify(id_priv->cm_id.ib, event);
2323 break;
2324 default:
2325 ret = 0;
2326 break;
2327 }
2328 return ret;
2329 }
2330 EXPORT_SYMBOL(rdma_notify);
2331
2332 int rdma_reject(struct rdma_cm_id *id, const void *private_data,
2333 u8 private_data_len)
2334 {
2335 struct rdma_id_private *id_priv;
2336 int ret;
2337
2338 id_priv = container_of(id, struct rdma_id_private, id);
2339 if (!cma_comp(id_priv, CMA_CONNECT))
2340 return -EINVAL;
2341
2342 switch (rdma_node_get_transport(id->device->node_type)) {
2343 case RDMA_TRANSPORT_IB:
2344 if (id->ps == RDMA_PS_UDP)
2345 ret = cma_send_sidr_rep(id_priv, IB_SIDR_REJECT,
2346 private_data, private_data_len);
2347 else
2348 ret = ib_send_cm_rej(id_priv->cm_id.ib,
2349 IB_CM_REJ_CONSUMER_DEFINED, NULL,
2350 0, private_data, private_data_len);
2351 break;
2352 case RDMA_TRANSPORT_IWARP:
2353 ret = iw_cm_reject(id_priv->cm_id.iw,
2354 private_data, private_data_len);
2355 break;
2356 default:
2357 ret = -ENOSYS;
2358 break;
2359 }
2360 return ret;
2361 }
2362 EXPORT_SYMBOL(rdma_reject);
2363
2364 int rdma_disconnect(struct rdma_cm_id *id)
2365 {
2366 struct rdma_id_private *id_priv;
2367 int ret;
2368
2369 id_priv = container_of(id, struct rdma_id_private, id);
2370 if (!cma_comp(id_priv, CMA_CONNECT) &&
2371 !cma_comp(id_priv, CMA_DISCONNECT))
2372 return -EINVAL;
2373
2374 switch (rdma_node_get_transport(id->device->node_type)) {
2375 case RDMA_TRANSPORT_IB:
2376 ret = cma_modify_qp_err(id);
2377 if (ret)
2378 goto out;
2379 /* Initiate or respond to a disconnect. */
2380 if (ib_send_cm_dreq(id_priv->cm_id.ib, NULL, 0))
2381 ib_send_cm_drep(id_priv->cm_id.ib, NULL, 0);
2382 break;
2383 case RDMA_TRANSPORT_IWARP:
2384 ret = iw_cm_disconnect(id_priv->cm_id.iw, 0);
2385 break;
2386 default:
2387 ret = -EINVAL;
2388 break;
2389 }
2390 out:
2391 return ret;
2392 }
2393 EXPORT_SYMBOL(rdma_disconnect);
2394
2395 static void cma_add_one(struct ib_device *device)
2396 {
2397 struct cma_device *cma_dev;
2398 struct rdma_id_private *id_priv;
2399
2400 cma_dev = kmalloc(sizeof *cma_dev, GFP_KERNEL);
2401 if (!cma_dev)
2402 return;
2403
2404 cma_dev->device = device;
2405 cma_dev->node_guid = device->node_guid;
2406
2407 init_completion(&cma_dev->comp);
2408 atomic_set(&cma_dev->refcount, 1);
2409 INIT_LIST_HEAD(&cma_dev->id_list);
2410 ib_set_client_data(device, &cma_client, cma_dev);
2411
2412 mutex_lock(&lock);
2413 list_add_tail(&cma_dev->list, &dev_list);
2414 list_for_each_entry(id_priv, &listen_any_list, list)
2415 cma_listen_on_dev(id_priv, cma_dev);
2416 mutex_unlock(&lock);
2417 }
2418
2419 static int cma_remove_id_dev(struct rdma_id_private *id_priv)
2420 {
2421 struct rdma_cm_event event;
2422 enum cma_state state;
2423
2424 /* Record that we want to remove the device */
2425 state = cma_exch(id_priv, CMA_DEVICE_REMOVAL);
2426 if (state == CMA_DESTROYING)
2427 return 0;
2428
2429 cma_cancel_operation(id_priv, state);
2430 wait_event(id_priv->wait_remove, !atomic_read(&id_priv->dev_remove));
2431
2432 /* Check for destruction from another callback. */
2433 if (!cma_comp(id_priv, CMA_DEVICE_REMOVAL))
2434 return 0;
2435
2436 memset(&event, 0, sizeof event);
2437 event.event = RDMA_CM_EVENT_DEVICE_REMOVAL;
2438 return id_priv->id.event_handler(&id_priv->id, &event);
2439 }
2440
2441 static void cma_process_remove(struct cma_device *cma_dev)
2442 {
2443 struct rdma_id_private *id_priv;
2444 int ret;
2445
2446 mutex_lock(&lock);
2447 while (!list_empty(&cma_dev->id_list)) {
2448 id_priv = list_entry(cma_dev->id_list.next,
2449 struct rdma_id_private, list);
2450
2451 if (cma_internal_listen(id_priv)) {
2452 cma_destroy_listen(id_priv);
2453 continue;
2454 }
2455
2456 list_del_init(&id_priv->list);
2457 atomic_inc(&id_priv->refcount);
2458 mutex_unlock(&lock);
2459
2460 ret = cma_remove_id_dev(id_priv);
2461 cma_deref_id(id_priv);
2462 if (ret)
2463 rdma_destroy_id(&id_priv->id);
2464
2465 mutex_lock(&lock);
2466 }
2467 mutex_unlock(&lock);
2468
2469 cma_deref_dev(cma_dev);
2470 wait_for_completion(&cma_dev->comp);
2471 }
2472
2473 static void cma_remove_one(struct ib_device *device)
2474 {
2475 struct cma_device *cma_dev;
2476
2477 cma_dev = ib_get_client_data(device, &cma_client);
2478 if (!cma_dev)
2479 return;
2480
2481 mutex_lock(&lock);
2482 list_del(&cma_dev->list);
2483 mutex_unlock(&lock);
2484
2485 cma_process_remove(cma_dev);
2486 kfree(cma_dev);
2487 }
2488
2489 static int cma_init(void)
2490 {
2491 int ret;
2492
2493 get_random_bytes(&next_port, sizeof next_port);
2494 next_port = (next_port % (sysctl_local_port_range[1] -
2495 sysctl_local_port_range[0])) +
2496 sysctl_local_port_range[0];
2497 cma_wq = create_singlethread_workqueue("rdma_cm_wq");
2498 if (!cma_wq)
2499 return -ENOMEM;
2500
2501 ib_sa_register_client(&sa_client);
2502 rdma_addr_register_client(&addr_client);
2503
2504 ret = ib_register_client(&cma_client);
2505 if (ret)
2506 goto err;
2507 return 0;
2508
2509 err:
2510 rdma_addr_unregister_client(&addr_client);
2511 ib_sa_unregister_client(&sa_client);
2512 destroy_workqueue(cma_wq);
2513 return ret;
2514 }
2515
2516 static void cma_cleanup(void)
2517 {
2518 ib_unregister_client(&cma_client);
2519 rdma_addr_unregister_client(&addr_client);
2520 ib_sa_unregister_client(&sa_client);
2521 destroy_workqueue(cma_wq);
2522 idr_destroy(&sdp_ps);
2523 idr_destroy(&tcp_ps);
2524 idr_destroy(&udp_ps);
2525 }
2526
2527 module_init(cma_init);
2528 module_exit(cma_cleanup);
kernel source for telekom puls (alcatel/mediatek)