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fs: use kmem_cache_zalloc instead
[pv_ops_mirror.git] / drivers / infiniband / core / cma.c
blob93644f82592c426074a9beba068b4e23d4910b79
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 #define CMA_CM_MRA_SETTING (IB_CM_MRA_FLAG_DELAY | 24)
56
57 static void cma_add_one(struct ib_device *device);
58 static void cma_remove_one(struct ib_device *device);
59
60 static struct ib_client cma_client = {
61 .name = "cma",
62 .add = cma_add_one,
63 .remove = cma_remove_one
64 };
65
66 static struct ib_sa_client sa_client;
67 static struct rdma_addr_client addr_client;
68 static LIST_HEAD(dev_list);
69 static LIST_HEAD(listen_any_list);
70 static DEFINE_MUTEX(lock);
71 static struct workqueue_struct *cma_wq;
72 static DEFINE_IDR(sdp_ps);
73 static DEFINE_IDR(tcp_ps);
74 static DEFINE_IDR(udp_ps);
75 static DEFINE_IDR(ipoib_ps);
76 static int next_port;
77
78 struct cma_device {
79 struct list_head list;
80 struct ib_device *device;
81 struct completion comp;
82 atomic_t refcount;
83 struct list_head id_list;
84 };
85
86 enum cma_state {
87 CMA_IDLE,
88 CMA_ADDR_QUERY,
89 CMA_ADDR_RESOLVED,
90 CMA_ROUTE_QUERY,
91 CMA_ROUTE_RESOLVED,
92 CMA_CONNECT,
93 CMA_DISCONNECT,
94 CMA_ADDR_BOUND,
95 CMA_LISTEN,
96 CMA_DEVICE_REMOVAL,
97 CMA_DESTROYING
98 };
99
100 struct rdma_bind_list {
101 struct idr *ps;
102 struct hlist_head owners;
103 unsigned short port;
104 };
105
106 /*
107 * Device removal can occur at anytime, so we need extra handling to
108 * serialize notifying the user of device removal with other callbacks.
109 * We do this by disabling removal notification while a callback is in process,
110 * and reporting it after the callback completes.
111 */
112 struct rdma_id_private {
113 struct rdma_cm_id id;
114
115 struct rdma_bind_list *bind_list;
116 struct hlist_node node;
117 struct list_head list;
118 struct list_head listen_list;
119 struct cma_device *cma_dev;
120 struct list_head mc_list;
121
122 enum cma_state state;
123 spinlock_t lock;
124 struct completion comp;
125 atomic_t refcount;
126 wait_queue_head_t wait_remove;
127 atomic_t dev_remove;
128
129 int backlog;
130 int timeout_ms;
131 struct ib_sa_query *query;
132 int query_id;
133 union {
134 struct ib_cm_id *ib;
135 struct iw_cm_id *iw;
136 } cm_id;
137
138 u32 seq_num;
139 u32 qkey;
140 u32 qp_num;
141 u8 srq;
142 u8 tos;
143 };
144
145 struct cma_multicast {
146 struct rdma_id_private *id_priv;
147 union {
148 struct ib_sa_multicast *ib;
149 } multicast;
150 struct list_head list;
151 void *context;
152 struct sockaddr addr;
153 u8 pad[sizeof(struct sockaddr_in6) -
154 sizeof(struct sockaddr)];
155 };
156
157 struct cma_work {
158 struct work_struct work;
159 struct rdma_id_private *id;
160 enum cma_state old_state;
161 enum cma_state new_state;
162 struct rdma_cm_event event;
163 };
164
165 union cma_ip_addr {
166 struct in6_addr ip6;
167 struct {
168 __u32 pad[3];
169 __u32 addr;
170 } ip4;
171 };
172
173 struct cma_hdr {
174 u8 cma_version;
175 u8 ip_version; /* IP version: 7:4 */
176 __u16 port;
177 union cma_ip_addr src_addr;
178 union cma_ip_addr dst_addr;
179 };
180
181 struct sdp_hh {
182 u8 bsdh[16];
183 u8 sdp_version; /* Major version: 7:4 */
184 u8 ip_version; /* IP version: 7:4 */
185 u8 sdp_specific1[10];
186 __u16 port;
187 __u16 sdp_specific2;
188 union cma_ip_addr src_addr;
189 union cma_ip_addr dst_addr;
190 };
191
192 struct sdp_hah {
193 u8 bsdh[16];
194 u8 sdp_version;
195 };
196
197 #define CMA_VERSION 0x00
198 #define SDP_MAJ_VERSION 0x2
199
200 static int cma_comp(struct rdma_id_private *id_priv, enum cma_state comp)
201 {
202 unsigned long flags;
203 int ret;
204
205 spin_lock_irqsave(&id_priv->lock, flags);
206 ret = (id_priv->state == comp);
207 spin_unlock_irqrestore(&id_priv->lock, flags);
208 return ret;
209 }
210
211 static int cma_comp_exch(struct rdma_id_private *id_priv,
212 enum cma_state comp, enum cma_state exch)
213 {
214 unsigned long flags;
215 int ret;
216
217 spin_lock_irqsave(&id_priv->lock, flags);
218 if ((ret = (id_priv->state == comp)))
219 id_priv->state = exch;
220 spin_unlock_irqrestore(&id_priv->lock, flags);
221 return ret;
222 }
223
224 static enum cma_state cma_exch(struct rdma_id_private *id_priv,
225 enum cma_state exch)
226 {
227 unsigned long flags;
228 enum cma_state old;
229
230 spin_lock_irqsave(&id_priv->lock, flags);
231 old = id_priv->state;
232 id_priv->state = exch;
233 spin_unlock_irqrestore(&id_priv->lock, flags);
234 return old;
235 }
236
237 static inline u8 cma_get_ip_ver(struct cma_hdr *hdr)
238 {
239 return hdr->ip_version >> 4;
240 }
241
242 static inline void cma_set_ip_ver(struct cma_hdr *hdr, u8 ip_ver)
243 {
244 hdr->ip_version = (ip_ver << 4) | (hdr->ip_version & 0xF);
245 }
246
247 static inline u8 sdp_get_majv(u8 sdp_version)
248 {
249 return sdp_version >> 4;
250 }
251
252 static inline u8 sdp_get_ip_ver(struct sdp_hh *hh)
253 {
254 return hh->ip_version >> 4;
255 }
256
257 static inline void sdp_set_ip_ver(struct sdp_hh *hh, u8 ip_ver)
258 {
259 hh->ip_version = (ip_ver << 4) | (hh->ip_version & 0xF);
260 }
261
262 static inline int cma_is_ud_ps(enum rdma_port_space ps)
263 {
264 return (ps == RDMA_PS_UDP || ps == RDMA_PS_IPOIB);
265 }
266
267 static void cma_attach_to_dev(struct rdma_id_private *id_priv,
268 struct cma_device *cma_dev)
269 {
270 atomic_inc(&cma_dev->refcount);
271 id_priv->cma_dev = cma_dev;
272 id_priv->id.device = cma_dev->device;
273 list_add_tail(&id_priv->list, &cma_dev->id_list);
274 }
275
276 static inline void cma_deref_dev(struct cma_device *cma_dev)
277 {
278 if (atomic_dec_and_test(&cma_dev->refcount))
279 complete(&cma_dev->comp);
280 }
281
282 static void cma_detach_from_dev(struct rdma_id_private *id_priv)
283 {
284 list_del(&id_priv->list);
285 cma_deref_dev(id_priv->cma_dev);
286 id_priv->cma_dev = NULL;
287 }
288
289 static int cma_set_qkey(struct ib_device *device, u8 port_num,
290 enum rdma_port_space ps,
291 struct rdma_dev_addr *dev_addr, u32 *qkey)
292 {
293 struct ib_sa_mcmember_rec rec;
294 int ret = 0;
295
296 switch (ps) {
297 case RDMA_PS_UDP:
298 *qkey = RDMA_UDP_QKEY;
299 break;
300 case RDMA_PS_IPOIB:
301 ib_addr_get_mgid(dev_addr, &rec.mgid);
302 ret = ib_sa_get_mcmember_rec(device, port_num, &rec.mgid, &rec);
303 *qkey = be32_to_cpu(rec.qkey);
304 break;
305 default:
306 break;
307 }
308 return ret;
309 }
310
311 static int cma_acquire_dev(struct rdma_id_private *id_priv)
312 {
313 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
314 struct cma_device *cma_dev;
315 union ib_gid gid;
316 int ret = -ENODEV;
317
318 switch (rdma_node_get_transport(dev_addr->dev_type)) {
319 case RDMA_TRANSPORT_IB:
320 ib_addr_get_sgid(dev_addr, &gid);
321 break;
322 case RDMA_TRANSPORT_IWARP:
323 iw_addr_get_sgid(dev_addr, &gid);
324 break;
325 default:
326 return -ENODEV;
327 }
328
329 list_for_each_entry(cma_dev, &dev_list, list) {
330 ret = ib_find_cached_gid(cma_dev->device, &gid,
331 &id_priv->id.port_num, NULL);
332 if (!ret) {
333 ret = cma_set_qkey(cma_dev->device,
334 id_priv->id.port_num,
335 id_priv->id.ps, dev_addr,
336 &id_priv->qkey);
337 if (!ret)
338 cma_attach_to_dev(id_priv, cma_dev);
339 break;
340 }
341 }
342 return ret;
343 }
344
345 static void cma_deref_id(struct rdma_id_private *id_priv)
346 {
347 if (atomic_dec_and_test(&id_priv->refcount))
348 complete(&id_priv->comp);
349 }
350
351 static int cma_disable_remove(struct rdma_id_private *id_priv,
352 enum cma_state state)
353 {
354 unsigned long flags;
355 int ret;
356
357 spin_lock_irqsave(&id_priv->lock, flags);
358 if (id_priv->state == state) {
359 atomic_inc(&id_priv->dev_remove);
360 ret = 0;
361 } else
362 ret = -EINVAL;
363 spin_unlock_irqrestore(&id_priv->lock, flags);
364 return ret;
365 }
366
367 static void cma_enable_remove(struct rdma_id_private *id_priv)
368 {
369 if (atomic_dec_and_test(&id_priv->dev_remove))
370 wake_up(&id_priv->wait_remove);
371 }
372
373 static int cma_has_cm_dev(struct rdma_id_private *id_priv)
374 {
375 return (id_priv->id.device && id_priv->cm_id.ib);
376 }
377
378 struct rdma_cm_id *rdma_create_id(rdma_cm_event_handler event_handler,
379 void *context, enum rdma_port_space ps)
380 {
381 struct rdma_id_private *id_priv;
382
383 id_priv = kzalloc(sizeof *id_priv, GFP_KERNEL);
384 if (!id_priv)
385 return ERR_PTR(-ENOMEM);
386
387 id_priv->state = CMA_IDLE;
388 id_priv->id.context = context;
389 id_priv->id.event_handler = event_handler;
390 id_priv->id.ps = ps;
391 spin_lock_init(&id_priv->lock);
392 init_completion(&id_priv->comp);
393 atomic_set(&id_priv->refcount, 1);
394 init_waitqueue_head(&id_priv->wait_remove);
395 atomic_set(&id_priv->dev_remove, 0);
396 INIT_LIST_HEAD(&id_priv->listen_list);
397 INIT_LIST_HEAD(&id_priv->mc_list);
398 get_random_bytes(&id_priv->seq_num, sizeof id_priv->seq_num);
399
400 return &id_priv->id;
401 }
402 EXPORT_SYMBOL(rdma_create_id);
403
404 static int cma_init_ud_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
405 {
406 struct ib_qp_attr qp_attr;
407 int qp_attr_mask, ret;
408
409 qp_attr.qp_state = IB_QPS_INIT;
410 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
411 if (ret)
412 return ret;
413
414 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
415 if (ret)
416 return ret;
417
418 qp_attr.qp_state = IB_QPS_RTR;
419 ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE);
420 if (ret)
421 return ret;
422
423 qp_attr.qp_state = IB_QPS_RTS;
424 qp_attr.sq_psn = 0;
425 ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE | IB_QP_SQ_PSN);
426
427 return ret;
428 }
429
430 static int cma_init_conn_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
431 {
432 struct ib_qp_attr qp_attr;
433 int qp_attr_mask, ret;
434
435 qp_attr.qp_state = IB_QPS_INIT;
436 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
437 if (ret)
438 return ret;
439
440 return ib_modify_qp(qp, &qp_attr, qp_attr_mask);
441 }
442
443 int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd,
444 struct ib_qp_init_attr *qp_init_attr)
445 {
446 struct rdma_id_private *id_priv;
447 struct ib_qp *qp;
448 int ret;
449
450 id_priv = container_of(id, struct rdma_id_private, id);
451 if (id->device != pd->device)
452 return -EINVAL;
453
454 qp = ib_create_qp(pd, qp_init_attr);
455 if (IS_ERR(qp))
456 return PTR_ERR(qp);
457
458 if (cma_is_ud_ps(id_priv->id.ps))
459 ret = cma_init_ud_qp(id_priv, qp);
460 else
461 ret = cma_init_conn_qp(id_priv, qp);
462 if (ret)
463 goto err;
464
465 id->qp = qp;
466 id_priv->qp_num = qp->qp_num;
467 id_priv->srq = (qp->srq != NULL);
468 return 0;
469 err:
470 ib_destroy_qp(qp);
471 return ret;
472 }
473 EXPORT_SYMBOL(rdma_create_qp);
474
475 void rdma_destroy_qp(struct rdma_cm_id *id)
476 {
477 ib_destroy_qp(id->qp);
478 }
479 EXPORT_SYMBOL(rdma_destroy_qp);
480
481 static int cma_modify_qp_rtr(struct rdma_cm_id *id)
482 {
483 struct ib_qp_attr qp_attr;
484 int qp_attr_mask, ret;
485
486 if (!id->qp)
487 return 0;
488
489 /* Need to update QP attributes from default values. */
490 qp_attr.qp_state = IB_QPS_INIT;
491 ret = rdma_init_qp_attr(id, &qp_attr, &qp_attr_mask);
492 if (ret)
493 return ret;
494
495 ret = ib_modify_qp(id->qp, &qp_attr, qp_attr_mask);
496 if (ret)
497 return ret;
498
499 qp_attr.qp_state = IB_QPS_RTR;
500 ret = rdma_init_qp_attr(id, &qp_attr, &qp_attr_mask);
501 if (ret)
502 return ret;
503
504 return ib_modify_qp(id->qp, &qp_attr, qp_attr_mask);
505 }
506
507 static int cma_modify_qp_rts(struct rdma_cm_id *id)
508 {
509 struct ib_qp_attr qp_attr;
510 int qp_attr_mask, ret;
511
512 if (!id->qp)
513 return 0;
514
515 qp_attr.qp_state = IB_QPS_RTS;
516 ret = rdma_init_qp_attr(id, &qp_attr, &qp_attr_mask);
517 if (ret)
518 return ret;
519
520 return ib_modify_qp(id->qp, &qp_attr, qp_attr_mask);
521 }
522
523 static int cma_modify_qp_err(struct rdma_cm_id *id)
524 {
525 struct ib_qp_attr qp_attr;
526
527 if (!id->qp)
528 return 0;
529
530 qp_attr.qp_state = IB_QPS_ERR;
531 return ib_modify_qp(id->qp, &qp_attr, IB_QP_STATE);
532 }
533
534 static int cma_ib_init_qp_attr(struct rdma_id_private *id_priv,
535 struct ib_qp_attr *qp_attr, int *qp_attr_mask)
536 {
537 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
538 int ret;
539
540 ret = ib_find_cached_pkey(id_priv->id.device, id_priv->id.port_num,
541 ib_addr_get_pkey(dev_addr),
542 &qp_attr->pkey_index);
543 if (ret)
544 return ret;
545
546 qp_attr->port_num = id_priv->id.port_num;
547 *qp_attr_mask = IB_QP_STATE | IB_QP_PKEY_INDEX | IB_QP_PORT;
548
549 if (cma_is_ud_ps(id_priv->id.ps)) {
550 qp_attr->qkey = id_priv->qkey;
551 *qp_attr_mask |= IB_QP_QKEY;
552 } else {
553 qp_attr->qp_access_flags = 0;
554 *qp_attr_mask |= IB_QP_ACCESS_FLAGS;
555 }
556 return 0;
557 }
558
559 int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
560 int *qp_attr_mask)
561 {
562 struct rdma_id_private *id_priv;
563 int ret = 0;
564
565 id_priv = container_of(id, struct rdma_id_private, id);
566 switch (rdma_node_get_transport(id_priv->id.device->node_type)) {
567 case RDMA_TRANSPORT_IB:
568 if (!id_priv->cm_id.ib || cma_is_ud_ps(id_priv->id.ps))
569 ret = cma_ib_init_qp_attr(id_priv, qp_attr, qp_attr_mask);
570 else
571 ret = ib_cm_init_qp_attr(id_priv->cm_id.ib, qp_attr,
572 qp_attr_mask);
573 if (qp_attr->qp_state == IB_QPS_RTR)
574 qp_attr->rq_psn = id_priv->seq_num;
575 break;
576 case RDMA_TRANSPORT_IWARP:
577 if (!id_priv->cm_id.iw) {
578 qp_attr->qp_access_flags = 0;
579 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS;
580 } else
581 ret = iw_cm_init_qp_attr(id_priv->cm_id.iw, qp_attr,
582 qp_attr_mask);
583 break;
584 default:
585 ret = -ENOSYS;
586 break;
587 }
588
589 return ret;
590 }
591 EXPORT_SYMBOL(rdma_init_qp_attr);
592
593 static inline int cma_zero_addr(struct sockaddr *addr)
594 {
595 struct in6_addr *ip6;
596
597 if (addr->sa_family == AF_INET)
598 return ZERONET(((struct sockaddr_in *) addr)->sin_addr.s_addr);
599 else {
600 ip6 = &((struct sockaddr_in6 *) addr)->sin6_addr;
601 return (ip6->s6_addr32[0] | ip6->s6_addr32[1] |
602 ip6->s6_addr32[2] | ip6->s6_addr32[3]) == 0;
603 }
604 }
605
606 static inline int cma_loopback_addr(struct sockaddr *addr)
607 {
608 return LOOPBACK(((struct sockaddr_in *) addr)->sin_addr.s_addr);
609 }
610
611 static inline int cma_any_addr(struct sockaddr *addr)
612 {
613 return cma_zero_addr(addr) || cma_loopback_addr(addr);
614 }
615
616 static inline __be16 cma_port(struct sockaddr *addr)
617 {
618 if (addr->sa_family == AF_INET)
619 return ((struct sockaddr_in *) addr)->sin_port;
620 else
621 return ((struct sockaddr_in6 *) addr)->sin6_port;
622 }
623
624 static inline int cma_any_port(struct sockaddr *addr)
625 {
626 return !cma_port(addr);
627 }
628
629 static int cma_get_net_info(void *hdr, enum rdma_port_space ps,
630 u8 *ip_ver, __u16 *port,
631 union cma_ip_addr **src, union cma_ip_addr **dst)
632 {
633 switch (ps) {
634 case RDMA_PS_SDP:
635 if (sdp_get_majv(((struct sdp_hh *) hdr)->sdp_version) !=
636 SDP_MAJ_VERSION)
637 return -EINVAL;
638
639 *ip_ver = sdp_get_ip_ver(hdr);
640 *port = ((struct sdp_hh *) hdr)->port;
641 *src = &((struct sdp_hh *) hdr)->src_addr;
642 *dst = &((struct sdp_hh *) hdr)->dst_addr;
643 break;
644 default:
645 if (((struct cma_hdr *) hdr)->cma_version != CMA_VERSION)
646 return -EINVAL;
647
648 *ip_ver = cma_get_ip_ver(hdr);
649 *port = ((struct cma_hdr *) hdr)->port;
650 *src = &((struct cma_hdr *) hdr)->src_addr;
651 *dst = &((struct cma_hdr *) hdr)->dst_addr;
652 break;
653 }
654
655 if (*ip_ver != 4 && *ip_ver != 6)
656 return -EINVAL;
657 return 0;
658 }
659
660 static void cma_save_net_info(struct rdma_addr *addr,
661 struct rdma_addr *listen_addr,
662 u8 ip_ver, __u16 port,
663 union cma_ip_addr *src, union cma_ip_addr *dst)
664 {
665 struct sockaddr_in *listen4, *ip4;
666 struct sockaddr_in6 *listen6, *ip6;
667
668 switch (ip_ver) {
669 case 4:
670 listen4 = (struct sockaddr_in *) &listen_addr->src_addr;
671 ip4 = (struct sockaddr_in *) &addr->src_addr;
672 ip4->sin_family = listen4->sin_family;
673 ip4->sin_addr.s_addr = dst->ip4.addr;
674 ip4->sin_port = listen4->sin_port;
675
676 ip4 = (struct sockaddr_in *) &addr->dst_addr;
677 ip4->sin_family = listen4->sin_family;
678 ip4->sin_addr.s_addr = src->ip4.addr;
679 ip4->sin_port = port;
680 break;
681 case 6:
682 listen6 = (struct sockaddr_in6 *) &listen_addr->src_addr;
683 ip6 = (struct sockaddr_in6 *) &addr->src_addr;
684 ip6->sin6_family = listen6->sin6_family;
685 ip6->sin6_addr = dst->ip6;
686 ip6->sin6_port = listen6->sin6_port;
687
688 ip6 = (struct sockaddr_in6 *) &addr->dst_addr;
689 ip6->sin6_family = listen6->sin6_family;
690 ip6->sin6_addr = src->ip6;
691 ip6->sin6_port = port;
692 break;
693 default:
694 break;
695 }
696 }
697
698 static inline int cma_user_data_offset(enum rdma_port_space ps)
699 {
700 switch (ps) {
701 case RDMA_PS_SDP:
702 return 0;
703 default:
704 return sizeof(struct cma_hdr);
705 }
706 }
707
708 static void cma_cancel_route(struct rdma_id_private *id_priv)
709 {
710 switch (rdma_node_get_transport(id_priv->id.device->node_type)) {
711 case RDMA_TRANSPORT_IB:
712 if (id_priv->query)
713 ib_sa_cancel_query(id_priv->query_id, id_priv->query);
714 break;
715 default:
716 break;
717 }
718 }
719
720 static inline int cma_internal_listen(struct rdma_id_private *id_priv)
721 {
722 return (id_priv->state == CMA_LISTEN) && id_priv->cma_dev &&
723 cma_any_addr(&id_priv->id.route.addr.src_addr);
724 }
725
726 static void cma_destroy_listen(struct rdma_id_private *id_priv)
727 {
728 cma_exch(id_priv, CMA_DESTROYING);
729
730 if (id_priv->cma_dev) {
731 switch (rdma_node_get_transport(id_priv->id.device->node_type)) {
732 case RDMA_TRANSPORT_IB:
733 if (id_priv->cm_id.ib && !IS_ERR(id_priv->cm_id.ib))
734 ib_destroy_cm_id(id_priv->cm_id.ib);
735 break;
736 case RDMA_TRANSPORT_IWARP:
737 if (id_priv->cm_id.iw && !IS_ERR(id_priv->cm_id.iw))
738 iw_destroy_cm_id(id_priv->cm_id.iw);
739 break;
740 default:
741 break;
742 }
743 cma_detach_from_dev(id_priv);
744 }
745 list_del(&id_priv->listen_list);
746
747 cma_deref_id(id_priv);
748 wait_for_completion(&id_priv->comp);
749
750 kfree(id_priv);
751 }
752
753 static void cma_cancel_listens(struct rdma_id_private *id_priv)
754 {
755 struct rdma_id_private *dev_id_priv;
756
757 mutex_lock(&lock);
758 list_del(&id_priv->list);
759
760 while (!list_empty(&id_priv->listen_list)) {
761 dev_id_priv = list_entry(id_priv->listen_list.next,
762 struct rdma_id_private, listen_list);
763 cma_destroy_listen(dev_id_priv);
764 }
765 mutex_unlock(&lock);
766 }
767
768 static void cma_cancel_operation(struct rdma_id_private *id_priv,
769 enum cma_state state)
770 {
771 switch (state) {
772 case CMA_ADDR_QUERY:
773 rdma_addr_cancel(&id_priv->id.route.addr.dev_addr);
774 break;
775 case CMA_ROUTE_QUERY:
776 cma_cancel_route(id_priv);
777 break;
778 case CMA_LISTEN:
779 if (cma_any_addr(&id_priv->id.route.addr.src_addr) &&
780 !id_priv->cma_dev)
781 cma_cancel_listens(id_priv);
782 break;
783 default:
784 break;
785 }
786 }
787
788 static void cma_release_port(struct rdma_id_private *id_priv)
789 {
790 struct rdma_bind_list *bind_list = id_priv->bind_list;
791
792 if (!bind_list)
793 return;
794
795 mutex_lock(&lock);
796 hlist_del(&id_priv->node);
797 if (hlist_empty(&bind_list->owners)) {
798 idr_remove(bind_list->ps, bind_list->port);
799 kfree(bind_list);
800 }
801 mutex_unlock(&lock);
802 }
803
804 static void cma_leave_mc_groups(struct rdma_id_private *id_priv)
805 {
806 struct cma_multicast *mc;
807
808 while (!list_empty(&id_priv->mc_list)) {
809 mc = container_of(id_priv->mc_list.next,
810 struct cma_multicast, list);
811 list_del(&mc->list);
812 ib_sa_free_multicast(mc->multicast.ib);
813 kfree(mc);
814 }
815 }
816
817 void rdma_destroy_id(struct rdma_cm_id *id)
818 {
819 struct rdma_id_private *id_priv;
820 enum cma_state state;
821
822 id_priv = container_of(id, struct rdma_id_private, id);
823 state = cma_exch(id_priv, CMA_DESTROYING);
824 cma_cancel_operation(id_priv, state);
825
826 mutex_lock(&lock);
827 if (id_priv->cma_dev) {
828 mutex_unlock(&lock);
829 switch (rdma_node_get_transport(id->device->node_type)) {
830 case RDMA_TRANSPORT_IB:
831 if (id_priv->cm_id.ib && !IS_ERR(id_priv->cm_id.ib))
832 ib_destroy_cm_id(id_priv->cm_id.ib);
833 break;
834 case RDMA_TRANSPORT_IWARP:
835 if (id_priv->cm_id.iw && !IS_ERR(id_priv->cm_id.iw))
836 iw_destroy_cm_id(id_priv->cm_id.iw);
837 break;
838 default:
839 break;
840 }
841 cma_leave_mc_groups(id_priv);
842 mutex_lock(&lock);
843 cma_detach_from_dev(id_priv);
844 }
845 mutex_unlock(&lock);
846
847 cma_release_port(id_priv);
848 cma_deref_id(id_priv);
849 wait_for_completion(&id_priv->comp);
850
851 kfree(id_priv->id.route.path_rec);
852 kfree(id_priv);
853 }
854 EXPORT_SYMBOL(rdma_destroy_id);
855
856 static int cma_rep_recv(struct rdma_id_private *id_priv)
857 {
858 int ret;
859
860 ret = cma_modify_qp_rtr(&id_priv->id);
861 if (ret)
862 goto reject;
863
864 ret = cma_modify_qp_rts(&id_priv->id);
865 if (ret)
866 goto reject;
867
868 ret = ib_send_cm_rtu(id_priv->cm_id.ib, NULL, 0);
869 if (ret)
870 goto reject;
871
872 return 0;
873 reject:
874 cma_modify_qp_err(&id_priv->id);
875 ib_send_cm_rej(id_priv->cm_id.ib, IB_CM_REJ_CONSUMER_DEFINED,
876 NULL, 0, NULL, 0);
877 return ret;
878 }
879
880 static int cma_verify_rep(struct rdma_id_private *id_priv, void *data)
881 {
882 if (id_priv->id.ps == RDMA_PS_SDP &&
883 sdp_get_majv(((struct sdp_hah *) data)->sdp_version) !=
884 SDP_MAJ_VERSION)
885 return -EINVAL;
886
887 return 0;
888 }
889
890 static void cma_set_rep_event_data(struct rdma_cm_event *event,
891 struct ib_cm_rep_event_param *rep_data,
892 void *private_data)
893 {
894 event->param.conn.private_data = private_data;
895 event->param.conn.private_data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
896 event->param.conn.responder_resources = rep_data->responder_resources;
897 event->param.conn.initiator_depth = rep_data->initiator_depth;
898 event->param.conn.flow_control = rep_data->flow_control;
899 event->param.conn.rnr_retry_count = rep_data->rnr_retry_count;
900 event->param.conn.srq = rep_data->srq;
901 event->param.conn.qp_num = rep_data->remote_qpn;
902 }
903
904 static int cma_ib_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
905 {
906 struct rdma_id_private *id_priv = cm_id->context;
907 struct rdma_cm_event event;
908 int ret = 0;
909
910 if (cma_disable_remove(id_priv, CMA_CONNECT))
911 return 0;
912
913 memset(&event, 0, sizeof event);
914 switch (ib_event->event) {
915 case IB_CM_REQ_ERROR:
916 case IB_CM_REP_ERROR:
917 event.event = RDMA_CM_EVENT_UNREACHABLE;
918 event.status = -ETIMEDOUT;
919 break;
920 case IB_CM_REP_RECEIVED:
921 event.status = cma_verify_rep(id_priv, ib_event->private_data);
922 if (event.status)
923 event.event = RDMA_CM_EVENT_CONNECT_ERROR;
924 else if (id_priv->id.qp && id_priv->id.ps != RDMA_PS_SDP) {
925 event.status = cma_rep_recv(id_priv);
926 event.event = event.status ? RDMA_CM_EVENT_CONNECT_ERROR :
927 RDMA_CM_EVENT_ESTABLISHED;
928 } else
929 event.event = RDMA_CM_EVENT_CONNECT_RESPONSE;
930 cma_set_rep_event_data(&event, &ib_event->param.rep_rcvd,
931 ib_event->private_data);
932 break;
933 case IB_CM_RTU_RECEIVED:
934 case IB_CM_USER_ESTABLISHED:
935 event.event = RDMA_CM_EVENT_ESTABLISHED;
936 break;
937 case IB_CM_DREQ_ERROR:
938 event.status = -ETIMEDOUT; /* fall through */
939 case IB_CM_DREQ_RECEIVED:
940 case IB_CM_DREP_RECEIVED:
941 if (!cma_comp_exch(id_priv, CMA_CONNECT, CMA_DISCONNECT))
942 goto out;
943 event.event = RDMA_CM_EVENT_DISCONNECTED;
944 break;
945 case IB_CM_TIMEWAIT_EXIT:
946 case IB_CM_MRA_RECEIVED:
947 /* ignore event */
948 goto out;
949 case IB_CM_REJ_RECEIVED:
950 cma_modify_qp_err(&id_priv->id);
951 event.status = ib_event->param.rej_rcvd.reason;
952 event.event = RDMA_CM_EVENT_REJECTED;
953 event.param.conn.private_data = ib_event->private_data;
954 event.param.conn.private_data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
955 break;
956 default:
957 printk(KERN_ERR "RDMA CMA: unexpected IB CM event: %d",
958 ib_event->event);
959 goto out;
960 }
961
962 ret = id_priv->id.event_handler(&id_priv->id, &event);
963 if (ret) {
964 /* Destroy the CM ID by returning a non-zero value. */
965 id_priv->cm_id.ib = NULL;
966 cma_exch(id_priv, CMA_DESTROYING);
967 cma_enable_remove(id_priv);
968 rdma_destroy_id(&id_priv->id);
969 return ret;
970 }
971 out:
972 cma_enable_remove(id_priv);
973 return ret;
974 }
975
976 static struct rdma_id_private *cma_new_conn_id(struct rdma_cm_id *listen_id,
977 struct ib_cm_event *ib_event)
978 {
979 struct rdma_id_private *id_priv;
980 struct rdma_cm_id *id;
981 struct rdma_route *rt;
982 union cma_ip_addr *src, *dst;
983 __u16 port;
984 u8 ip_ver;
985
986 if (cma_get_net_info(ib_event->private_data, listen_id->ps,
987 &ip_ver, &port, &src, &dst))
988 goto err;
989
990 id = rdma_create_id(listen_id->event_handler, listen_id->context,
991 listen_id->ps);
992 if (IS_ERR(id))
993 goto err;
994
995 cma_save_net_info(&id->route.addr, &listen_id->route.addr,
996 ip_ver, port, src, dst);
997
998 rt = &id->route;
999 rt->num_paths = ib_event->param.req_rcvd.alternate_path ? 2 : 1;
1000 rt->path_rec = kmalloc(sizeof *rt->path_rec * rt->num_paths,
1001 GFP_KERNEL);
1002 if (!rt->path_rec)
1003 goto destroy_id;
1004
1005 rt->path_rec[0] = *ib_event->param.req_rcvd.primary_path;
1006 if (rt->num_paths == 2)
1007 rt->path_rec[1] = *ib_event->param.req_rcvd.alternate_path;
1008
1009 ib_addr_set_sgid(&rt->addr.dev_addr, &rt->path_rec[0].sgid);
1010 ib_addr_set_dgid(&rt->addr.dev_addr, &rt->path_rec[0].dgid);
1011 ib_addr_set_pkey(&rt->addr.dev_addr, be16_to_cpu(rt->path_rec[0].pkey));
1012 rt->addr.dev_addr.dev_type = RDMA_NODE_IB_CA;
1013
1014 id_priv = container_of(id, struct rdma_id_private, id);
1015 id_priv->state = CMA_CONNECT;
1016 return id_priv;
1017
1018 destroy_id:
1019 rdma_destroy_id(id);
1020 err:
1021 return NULL;
1022 }
1023
1024 static struct rdma_id_private *cma_new_udp_id(struct rdma_cm_id *listen_id,
1025 struct ib_cm_event *ib_event)
1026 {
1027 struct rdma_id_private *id_priv;
1028 struct rdma_cm_id *id;
1029 union cma_ip_addr *src, *dst;
1030 __u16 port;
1031 u8 ip_ver;
1032 int ret;
1033
1034 id = rdma_create_id(listen_id->event_handler, listen_id->context,
1035 listen_id->ps);
1036 if (IS_ERR(id))
1037 return NULL;
1038
1039
1040 if (cma_get_net_info(ib_event->private_data, listen_id->ps,
1041 &ip_ver, &port, &src, &dst))
1042 goto err;
1043
1044 cma_save_net_info(&id->route.addr, &listen_id->route.addr,
1045 ip_ver, port, src, dst);
1046
1047 ret = rdma_translate_ip(&id->route.addr.src_addr,
1048 &id->route.addr.dev_addr);
1049 if (ret)
1050 goto err;
1051
1052 id_priv = container_of(id, struct rdma_id_private, id);
1053 id_priv->state = CMA_CONNECT;
1054 return id_priv;
1055 err:
1056 rdma_destroy_id(id);
1057 return NULL;
1058 }
1059
1060 static void cma_set_req_event_data(struct rdma_cm_event *event,
1061 struct ib_cm_req_event_param *req_data,
1062 void *private_data, int offset)
1063 {
1064 event->param.conn.private_data = private_data + offset;
1065 event->param.conn.private_data_len = IB_CM_REQ_PRIVATE_DATA_SIZE - offset;
1066 event->param.conn.responder_resources = req_data->responder_resources;
1067 event->param.conn.initiator_depth = req_data->initiator_depth;
1068 event->param.conn.flow_control = req_data->flow_control;
1069 event->param.conn.retry_count = req_data->retry_count;
1070 event->param.conn.rnr_retry_count = req_data->rnr_retry_count;
1071 event->param.conn.srq = req_data->srq;
1072 event->param.conn.qp_num = req_data->remote_qpn;
1073 }
1074
1075 static int cma_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
1076 {
1077 struct rdma_id_private *listen_id, *conn_id;
1078 struct rdma_cm_event event;
1079 int offset, ret;
1080
1081 listen_id = cm_id->context;
1082 if (cma_disable_remove(listen_id, CMA_LISTEN))
1083 return -ECONNABORTED;
1084
1085 memset(&event, 0, sizeof event);
1086 offset = cma_user_data_offset(listen_id->id.ps);
1087 event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
1088 if (cma_is_ud_ps(listen_id->id.ps)) {
1089 conn_id = cma_new_udp_id(&listen_id->id, ib_event);
1090 event.param.ud.private_data = ib_event->private_data + offset;
1091 event.param.ud.private_data_len =
1092 IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE - offset;
1093 } else {
1094 ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0);
1095 conn_id = cma_new_conn_id(&listen_id->id, ib_event);
1096 cma_set_req_event_data(&event, &ib_event->param.req_rcvd,
1097 ib_event->private_data, offset);
1098 }
1099 if (!conn_id) {
1100 ret = -ENOMEM;
1101 goto out;
1102 }
1103
1104 atomic_inc(&conn_id->dev_remove);
1105 mutex_lock(&lock);
1106 ret = cma_acquire_dev(conn_id);
1107 mutex_unlock(&lock);
1108 if (ret)
1109 goto release_conn_id;
1110
1111 conn_id->cm_id.ib = cm_id;
1112 cm_id->context = conn_id;
1113 cm_id->cm_handler = cma_ib_handler;
1114
1115 ret = conn_id->id.event_handler(&conn_id->id, &event);
1116 if (!ret)
1117 goto out;
1118
1119 /* Destroy the CM ID by returning a non-zero value. */
1120 conn_id->cm_id.ib = NULL;
1121
1122 release_conn_id:
1123 cma_exch(conn_id, CMA_DESTROYING);
1124 cma_enable_remove(conn_id);
1125 rdma_destroy_id(&conn_id->id);
1126
1127 out:
1128 cma_enable_remove(listen_id);
1129 return ret;
1130 }
1131
1132 static __be64 cma_get_service_id(enum rdma_port_space ps, struct sockaddr *addr)
1133 {
1134 return cpu_to_be64(((u64)ps << 16) + be16_to_cpu(cma_port(addr)));
1135 }
1136
1137 static void cma_set_compare_data(enum rdma_port_space ps, struct sockaddr *addr,
1138 struct ib_cm_compare_data *compare)
1139 {
1140 struct cma_hdr *cma_data, *cma_mask;
1141 struct sdp_hh *sdp_data, *sdp_mask;
1142 __u32 ip4_addr;
1143 struct in6_addr ip6_addr;
1144
1145 memset(compare, 0, sizeof *compare);
1146 cma_data = (void *) compare->data;
1147 cma_mask = (void *) compare->mask;
1148 sdp_data = (void *) compare->data;
1149 sdp_mask = (void *) compare->mask;
1150
1151 switch (addr->sa_family) {
1152 case AF_INET:
1153 ip4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
1154 if (ps == RDMA_PS_SDP) {
1155 sdp_set_ip_ver(sdp_data, 4);
1156 sdp_set_ip_ver(sdp_mask, 0xF);
1157 sdp_data->dst_addr.ip4.addr = ip4_addr;
1158 sdp_mask->dst_addr.ip4.addr = ~0;
1159 } else {
1160 cma_set_ip_ver(cma_data, 4);
1161 cma_set_ip_ver(cma_mask, 0xF);
1162 cma_data->dst_addr.ip4.addr = ip4_addr;
1163 cma_mask->dst_addr.ip4.addr = ~0;
1164 }
1165 break;
1166 case AF_INET6:
1167 ip6_addr = ((struct sockaddr_in6 *) addr)->sin6_addr;
1168 if (ps == RDMA_PS_SDP) {
1169 sdp_set_ip_ver(sdp_data, 6);
1170 sdp_set_ip_ver(sdp_mask, 0xF);
1171 sdp_data->dst_addr.ip6 = ip6_addr;
1172 memset(&sdp_mask->dst_addr.ip6, 0xFF,
1173 sizeof sdp_mask->dst_addr.ip6);
1174 } else {
1175 cma_set_ip_ver(cma_data, 6);
1176 cma_set_ip_ver(cma_mask, 0xF);
1177 cma_data->dst_addr.ip6 = ip6_addr;
1178 memset(&cma_mask->dst_addr.ip6, 0xFF,
1179 sizeof cma_mask->dst_addr.ip6);
1180 }
1181 break;
1182 default:
1183 break;
1184 }
1185 }
1186
1187 static int cma_iw_handler(struct iw_cm_id *iw_id, struct iw_cm_event *iw_event)
1188 {
1189 struct rdma_id_private *id_priv = iw_id->context;
1190 struct rdma_cm_event event;
1191 struct sockaddr_in *sin;
1192 int ret = 0;
1193
1194 if (cma_disable_remove(id_priv, CMA_CONNECT))
1195 return 0;
1196
1197 memset(&event, 0, sizeof event);
1198 switch (iw_event->event) {
1199 case IW_CM_EVENT_CLOSE:
1200 event.event = RDMA_CM_EVENT_DISCONNECTED;
1201 break;
1202 case IW_CM_EVENT_CONNECT_REPLY:
1203 sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
1204 *sin = iw_event->local_addr;
1205 sin = (struct sockaddr_in *) &id_priv->id.route.addr.dst_addr;
1206 *sin = iw_event->remote_addr;
1207 switch (iw_event->status) {
1208 case 0:
1209 event.event = RDMA_CM_EVENT_ESTABLISHED;
1210 break;
1211 case -ECONNRESET:
1212 case -ECONNREFUSED:
1213 event.event = RDMA_CM_EVENT_REJECTED;
1214 break;
1215 case -ETIMEDOUT:
1216 event.event = RDMA_CM_EVENT_UNREACHABLE;
1217 break;
1218 default:
1219 event.event = RDMA_CM_EVENT_CONNECT_ERROR;
1220 break;
1221 }
1222 break;
1223 case IW_CM_EVENT_ESTABLISHED:
1224 event.event = RDMA_CM_EVENT_ESTABLISHED;
1225 break;
1226 default:
1227 BUG_ON(1);
1228 }
1229
1230 event.status = iw_event->status;
1231 event.param.conn.private_data = iw_event->private_data;
1232 event.param.conn.private_data_len = iw_event->private_data_len;
1233 ret = id_priv->id.event_handler(&id_priv->id, &event);
1234 if (ret) {
1235 /* Destroy the CM ID by returning a non-zero value. */
1236 id_priv->cm_id.iw = NULL;
1237 cma_exch(id_priv, CMA_DESTROYING);
1238 cma_enable_remove(id_priv);
1239 rdma_destroy_id(&id_priv->id);
1240 return ret;
1241 }
1242
1243 cma_enable_remove(id_priv);
1244 return ret;
1245 }
1246
1247 static int iw_conn_req_handler(struct iw_cm_id *cm_id,
1248 struct iw_cm_event *iw_event)
1249 {
1250 struct rdma_cm_id *new_cm_id;
1251 struct rdma_id_private *listen_id, *conn_id;
1252 struct sockaddr_in *sin;
1253 struct net_device *dev = NULL;
1254 struct rdma_cm_event event;
1255 int ret;
1256
1257 listen_id = cm_id->context;
1258 if (cma_disable_remove(listen_id, CMA_LISTEN))
1259 return -ECONNABORTED;
1260
1261 /* Create a new RDMA id for the new IW CM ID */
1262 new_cm_id = rdma_create_id(listen_id->id.event_handler,
1263 listen_id->id.context,
1264 RDMA_PS_TCP);
1265 if (!new_cm_id) {
1266 ret = -ENOMEM;
1267 goto out;
1268 }
1269 conn_id = container_of(new_cm_id, struct rdma_id_private, id);
1270 atomic_inc(&conn_id->dev_remove);
1271 conn_id->state = CMA_CONNECT;
1272
1273 dev = ip_dev_find(iw_event->local_addr.sin_addr.s_addr);
1274 if (!dev) {
1275 ret = -EADDRNOTAVAIL;
1276 cma_enable_remove(conn_id);
1277 rdma_destroy_id(new_cm_id);
1278 goto out;
1279 }
1280 ret = rdma_copy_addr(&conn_id->id.route.addr.dev_addr, dev, NULL);
1281 if (ret) {
1282 cma_enable_remove(conn_id);
1283 rdma_destroy_id(new_cm_id);
1284 goto out;
1285 }
1286
1287 mutex_lock(&lock);
1288 ret = cma_acquire_dev(conn_id);
1289 mutex_unlock(&lock);
1290 if (ret) {
1291 cma_enable_remove(conn_id);
1292 rdma_destroy_id(new_cm_id);
1293 goto out;
1294 }
1295
1296 conn_id->cm_id.iw = cm_id;
1297 cm_id->context = conn_id;
1298 cm_id->cm_handler = cma_iw_handler;
1299
1300 sin = (struct sockaddr_in *) &new_cm_id->route.addr.src_addr;
1301 *sin = iw_event->local_addr;
1302 sin = (struct sockaddr_in *) &new_cm_id->route.addr.dst_addr;
1303 *sin = iw_event->remote_addr;
1304
1305 memset(&event, 0, sizeof event);
1306 event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
1307 event.param.conn.private_data = iw_event->private_data;
1308 event.param.conn.private_data_len = iw_event->private_data_len;
1309 ret = conn_id->id.event_handler(&conn_id->id, &event);
1310 if (ret) {
1311 /* User wants to destroy the CM ID */
1312 conn_id->cm_id.iw = NULL;
1313 cma_exch(conn_id, CMA_DESTROYING);
1314 cma_enable_remove(conn_id);
1315 rdma_destroy_id(&conn_id->id);
1316 }
1317
1318 out:
1319 if (dev)
1320 dev_put(dev);
1321 cma_enable_remove(listen_id);
1322 return ret;
1323 }
1324
1325 static int cma_ib_listen(struct rdma_id_private *id_priv)
1326 {
1327 struct ib_cm_compare_data compare_data;
1328 struct sockaddr *addr;
1329 __be64 svc_id;
1330 int ret;
1331
1332 id_priv->cm_id.ib = ib_create_cm_id(id_priv->id.device, cma_req_handler,
1333 id_priv);
1334 if (IS_ERR(id_priv->cm_id.ib))
1335 return PTR_ERR(id_priv->cm_id.ib);
1336
1337 addr = &id_priv->id.route.addr.src_addr;
1338 svc_id = cma_get_service_id(id_priv->id.ps, addr);
1339 if (cma_any_addr(addr))
1340 ret = ib_cm_listen(id_priv->cm_id.ib, svc_id, 0, NULL);
1341 else {
1342 cma_set_compare_data(id_priv->id.ps, addr, &compare_data);
1343 ret = ib_cm_listen(id_priv->cm_id.ib, svc_id, 0, &compare_data);
1344 }
1345
1346 if (ret) {
1347 ib_destroy_cm_id(id_priv->cm_id.ib);
1348 id_priv->cm_id.ib = NULL;
1349 }
1350
1351 return ret;
1352 }
1353
1354 static int cma_iw_listen(struct rdma_id_private *id_priv, int backlog)
1355 {
1356 int ret;
1357 struct sockaddr_in *sin;
1358
1359 id_priv->cm_id.iw = iw_create_cm_id(id_priv->id.device,
1360 iw_conn_req_handler,
1361 id_priv);
1362 if (IS_ERR(id_priv->cm_id.iw))
1363 return PTR_ERR(id_priv->cm_id.iw);
1364
1365 sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
1366 id_priv->cm_id.iw->local_addr = *sin;
1367
1368 ret = iw_cm_listen(id_priv->cm_id.iw, backlog);
1369
1370 if (ret) {
1371 iw_destroy_cm_id(id_priv->cm_id.iw);
1372 id_priv->cm_id.iw = NULL;
1373 }
1374
1375 return ret;
1376 }
1377
1378 static int cma_listen_handler(struct rdma_cm_id *id,
1379 struct rdma_cm_event *event)
1380 {
1381 struct rdma_id_private *id_priv = id->context;
1382
1383 id->context = id_priv->id.context;
1384 id->event_handler = id_priv->id.event_handler;
1385 return id_priv->id.event_handler(id, event);
1386 }
1387
1388 static void cma_listen_on_dev(struct rdma_id_private *id_priv,
1389 struct cma_device *cma_dev)
1390 {
1391 struct rdma_id_private *dev_id_priv;
1392 struct rdma_cm_id *id;
1393 int ret;
1394
1395 id = rdma_create_id(cma_listen_handler, id_priv, id_priv->id.ps);
1396 if (IS_ERR(id))
1397 return;
1398
1399 dev_id_priv = container_of(id, struct rdma_id_private, id);
1400
1401 dev_id_priv->state = CMA_ADDR_BOUND;
1402 memcpy(&id->route.addr.src_addr, &id_priv->id.route.addr.src_addr,
1403 ip_addr_size(&id_priv->id.route.addr.src_addr));
1404
1405 cma_attach_to_dev(dev_id_priv, cma_dev);
1406 list_add_tail(&dev_id_priv->listen_list, &id_priv->listen_list);
1407
1408 ret = rdma_listen(id, id_priv->backlog);
1409 if (ret)
1410 goto err;
1411
1412 return;
1413 err:
1414 cma_destroy_listen(dev_id_priv);
1415 }
1416
1417 static void cma_listen_on_all(struct rdma_id_private *id_priv)
1418 {
1419 struct cma_device *cma_dev;
1420
1421 mutex_lock(&lock);
1422 list_add_tail(&id_priv->list, &listen_any_list);
1423 list_for_each_entry(cma_dev, &dev_list, list)
1424 cma_listen_on_dev(id_priv, cma_dev);
1425 mutex_unlock(&lock);
1426 }
1427
1428 static int cma_bind_any(struct rdma_cm_id *id, sa_family_t af)
1429 {
1430 struct sockaddr_in addr_in;
1431
1432 memset(&addr_in, 0, sizeof addr_in);
1433 addr_in.sin_family = af;
1434 return rdma_bind_addr(id, (struct sockaddr *) &addr_in);
1435 }
1436
1437 int rdma_listen(struct rdma_cm_id *id, int backlog)
1438 {
1439 struct rdma_id_private *id_priv;
1440 int ret;
1441
1442 id_priv = container_of(id, struct rdma_id_private, id);
1443 if (id_priv->state == CMA_IDLE) {
1444 ret = cma_bind_any(id, AF_INET);
1445 if (ret)
1446 return ret;
1447 }
1448
1449 if (!cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_LISTEN))
1450 return -EINVAL;
1451
1452 id_priv->backlog = backlog;
1453 if (id->device) {
1454 switch (rdma_node_get_transport(id->device->node_type)) {
1455 case RDMA_TRANSPORT_IB:
1456 ret = cma_ib_listen(id_priv);
1457 if (ret)
1458 goto err;
1459 break;
1460 case RDMA_TRANSPORT_IWARP:
1461 ret = cma_iw_listen(id_priv, backlog);
1462 if (ret)
1463 goto err;
1464 break;
1465 default:
1466 ret = -ENOSYS;
1467 goto err;
1468 }
1469 } else
1470 cma_listen_on_all(id_priv);
1471
1472 return 0;
1473 err:
1474 id_priv->backlog = 0;
1475 cma_comp_exch(id_priv, CMA_LISTEN, CMA_ADDR_BOUND);
1476 return ret;
1477 }
1478 EXPORT_SYMBOL(rdma_listen);
1479
1480 void rdma_set_service_type(struct rdma_cm_id *id, int tos)
1481 {
1482 struct rdma_id_private *id_priv;
1483
1484 id_priv = container_of(id, struct rdma_id_private, id);
1485 id_priv->tos = (u8) tos;
1486 }
1487 EXPORT_SYMBOL(rdma_set_service_type);
1488
1489 static void cma_query_handler(int status, struct ib_sa_path_rec *path_rec,
1490 void *context)
1491 {
1492 struct cma_work *work = context;
1493 struct rdma_route *route;
1494
1495 route = &work->id->id.route;
1496
1497 if (!status) {
1498 route->num_paths = 1;
1499 *route->path_rec = *path_rec;
1500 } else {
1501 work->old_state = CMA_ROUTE_QUERY;
1502 work->new_state = CMA_ADDR_RESOLVED;
1503 work->event.event = RDMA_CM_EVENT_ROUTE_ERROR;
1504 work->event.status = status;
1505 }
1506
1507 queue_work(cma_wq, &work->work);
1508 }
1509
1510 static int cma_query_ib_route(struct rdma_id_private *id_priv, int timeout_ms,
1511 struct cma_work *work)
1512 {
1513 struct rdma_addr *addr = &id_priv->id.route.addr;
1514 struct ib_sa_path_rec path_rec;
1515 ib_sa_comp_mask comp_mask;
1516 struct sockaddr_in6 *sin6;
1517
1518 memset(&path_rec, 0, sizeof path_rec);
1519 ib_addr_get_sgid(&addr->dev_addr, &path_rec.sgid);
1520 ib_addr_get_dgid(&addr->dev_addr, &path_rec.dgid);
1521 path_rec.pkey = cpu_to_be16(ib_addr_get_pkey(&addr->dev_addr));
1522 path_rec.numb_path = 1;
1523 path_rec.reversible = 1;
1524 path_rec.service_id = cma_get_service_id(id_priv->id.ps, &addr->dst_addr);
1525
1526 comp_mask = IB_SA_PATH_REC_DGID | IB_SA_PATH_REC_SGID |
1527 IB_SA_PATH_REC_PKEY | IB_SA_PATH_REC_NUMB_PATH |
1528 IB_SA_PATH_REC_REVERSIBLE | IB_SA_PATH_REC_SERVICE_ID;
1529
1530 if (addr->src_addr.sa_family == AF_INET) {
1531 path_rec.qos_class = cpu_to_be16((u16) id_priv->tos);
1532 comp_mask |= IB_SA_PATH_REC_QOS_CLASS;
1533 } else {
1534 sin6 = (struct sockaddr_in6 *) &addr->src_addr;
1535 path_rec.traffic_class = (u8) (be32_to_cpu(sin6->sin6_flowinfo) >> 20);
1536 comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
1537 }
1538
1539 id_priv->query_id = ib_sa_path_rec_get(&sa_client, id_priv->id.device,
1540 id_priv->id.port_num, &path_rec,
1541 comp_mask, timeout_ms,
1542 GFP_KERNEL, cma_query_handler,
1543 work, &id_priv->query);
1544
1545 return (id_priv->query_id < 0) ? id_priv->query_id : 0;
1546 }
1547
1548 static void cma_work_handler(struct work_struct *_work)
1549 {
1550 struct cma_work *work = container_of(_work, struct cma_work, work);
1551 struct rdma_id_private *id_priv = work->id;
1552 int destroy = 0;
1553
1554 atomic_inc(&id_priv->dev_remove);
1555 if (!cma_comp_exch(id_priv, work->old_state, work->new_state))
1556 goto out;
1557
1558 if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
1559 cma_exch(id_priv, CMA_DESTROYING);
1560 destroy = 1;
1561 }
1562 out:
1563 cma_enable_remove(id_priv);
1564 cma_deref_id(id_priv);
1565 if (destroy)
1566 rdma_destroy_id(&id_priv->id);
1567 kfree(work);
1568 }
1569
1570 static int cma_resolve_ib_route(struct rdma_id_private *id_priv, int timeout_ms)
1571 {
1572 struct rdma_route *route = &id_priv->id.route;
1573 struct cma_work *work;
1574 int ret;
1575
1576 work = kzalloc(sizeof *work, GFP_KERNEL);
1577 if (!work)
1578 return -ENOMEM;
1579
1580 work->id = id_priv;
1581 INIT_WORK(&work->work, cma_work_handler);
1582 work->old_state = CMA_ROUTE_QUERY;
1583 work->new_state = CMA_ROUTE_RESOLVED;
1584 work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
1585
1586 route->path_rec = kmalloc(sizeof *route->path_rec, GFP_KERNEL);
1587 if (!route->path_rec) {
1588 ret = -ENOMEM;
1589 goto err1;
1590 }
1591
1592 ret = cma_query_ib_route(id_priv, timeout_ms, work);
1593 if (ret)
1594 goto err2;
1595
1596 return 0;
1597 err2:
1598 kfree(route->path_rec);
1599 route->path_rec = NULL;
1600 err1:
1601 kfree(work);
1602 return ret;
1603 }
1604
1605 int rdma_set_ib_paths(struct rdma_cm_id *id,
1606 struct ib_sa_path_rec *path_rec, int num_paths)
1607 {
1608 struct rdma_id_private *id_priv;
1609 int ret;
1610
1611 id_priv = container_of(id, struct rdma_id_private, id);
1612 if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ROUTE_RESOLVED))
1613 return -EINVAL;
1614
1615 id->route.path_rec = kmalloc(sizeof *path_rec * num_paths, GFP_KERNEL);
1616 if (!id->route.path_rec) {
1617 ret = -ENOMEM;
1618 goto err;
1619 }
1620
1621 memcpy(id->route.path_rec, path_rec, sizeof *path_rec * num_paths);
1622 return 0;
1623 err:
1624 cma_comp_exch(id_priv, CMA_ROUTE_RESOLVED, CMA_ADDR_RESOLVED);
1625 return ret;
1626 }
1627 EXPORT_SYMBOL(rdma_set_ib_paths);
1628
1629 static int cma_resolve_iw_route(struct rdma_id_private *id_priv, int timeout_ms)
1630 {
1631 struct cma_work *work;
1632
1633 work = kzalloc(sizeof *work, GFP_KERNEL);
1634 if (!work)
1635 return -ENOMEM;
1636
1637 work->id = id_priv;
1638 INIT_WORK(&work->work, cma_work_handler);
1639 work->old_state = CMA_ROUTE_QUERY;
1640 work->new_state = CMA_ROUTE_RESOLVED;
1641 work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
1642 queue_work(cma_wq, &work->work);
1643 return 0;
1644 }
1645
1646 int rdma_resolve_route(struct rdma_cm_id *id, int timeout_ms)
1647 {
1648 struct rdma_id_private *id_priv;
1649 int ret;
1650
1651 id_priv = container_of(id, struct rdma_id_private, id);
1652 if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ROUTE_QUERY))
1653 return -EINVAL;
1654
1655 atomic_inc(&id_priv->refcount);
1656 switch (rdma_node_get_transport(id->device->node_type)) {
1657 case RDMA_TRANSPORT_IB:
1658 ret = cma_resolve_ib_route(id_priv, timeout_ms);
1659 break;
1660 case RDMA_TRANSPORT_IWARP:
1661 ret = cma_resolve_iw_route(id_priv, timeout_ms);
1662 break;
1663 default:
1664 ret = -ENOSYS;
1665 break;
1666 }
1667 if (ret)
1668 goto err;
1669
1670 return 0;
1671 err:
1672 cma_comp_exch(id_priv, CMA_ROUTE_QUERY, CMA_ADDR_RESOLVED);
1673 cma_deref_id(id_priv);
1674 return ret;
1675 }
1676 EXPORT_SYMBOL(rdma_resolve_route);
1677
1678 static int cma_bind_loopback(struct rdma_id_private *id_priv)
1679 {
1680 struct cma_device *cma_dev;
1681 struct ib_port_attr port_attr;
1682 union ib_gid gid;
1683 u16 pkey;
1684 int ret;
1685 u8 p;
1686
1687 mutex_lock(&lock);
1688 if (list_empty(&dev_list)) {
1689 ret = -ENODEV;
1690 goto out;
1691 }
1692 list_for_each_entry(cma_dev, &dev_list, list)
1693 for (p = 1; p <= cma_dev->device->phys_port_cnt; ++p)
1694 if (!ib_query_port(cma_dev->device, p, &port_attr) &&
1695 port_attr.state == IB_PORT_ACTIVE)
1696 goto port_found;
1697
1698 p = 1;
1699 cma_dev = list_entry(dev_list.next, struct cma_device, list);
1700
1701 port_found:
1702 ret = ib_get_cached_gid(cma_dev->device, p, 0, &gid);
1703 if (ret)
1704 goto out;
1705
1706 ret = ib_get_cached_pkey(cma_dev->device, p, 0, &pkey);
1707 if (ret)
1708 goto out;
1709
1710 ib_addr_set_sgid(&id_priv->id.route.addr.dev_addr, &gid);
1711 ib_addr_set_pkey(&id_priv->id.route.addr.dev_addr, pkey);
1712 id_priv->id.port_num = p;
1713 cma_attach_to_dev(id_priv, cma_dev);
1714 out:
1715 mutex_unlock(&lock);
1716 return ret;
1717 }
1718
1719 static void addr_handler(int status, struct sockaddr *src_addr,
1720 struct rdma_dev_addr *dev_addr, void *context)
1721 {
1722 struct rdma_id_private *id_priv = context;
1723 struct rdma_cm_event event;
1724
1725 memset(&event, 0, sizeof event);
1726 atomic_inc(&id_priv->dev_remove);
1727
1728 /*
1729 * Grab mutex to block rdma_destroy_id() from removing the device while
1730 * we're trying to acquire it.
1731 */
1732 mutex_lock(&lock);
1733 if (!cma_comp_exch(id_priv, CMA_ADDR_QUERY, CMA_ADDR_RESOLVED)) {
1734 mutex_unlock(&lock);
1735 goto out;
1736 }
1737
1738 if (!status && !id_priv->cma_dev)
1739 status = cma_acquire_dev(id_priv);
1740 mutex_unlock(&lock);
1741
1742 if (status) {
1743 if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ADDR_BOUND))
1744 goto out;
1745 event.event = RDMA_CM_EVENT_ADDR_ERROR;
1746 event.status = status;
1747 } else {
1748 memcpy(&id_priv->id.route.addr.src_addr, src_addr,
1749 ip_addr_size(src_addr));
1750 event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
1751 }
1752
1753 if (id_priv->id.event_handler(&id_priv->id, &event)) {
1754 cma_exch(id_priv, CMA_DESTROYING);
1755 cma_enable_remove(id_priv);
1756 cma_deref_id(id_priv);
1757 rdma_destroy_id(&id_priv->id);
1758 return;
1759 }
1760 out:
1761 cma_enable_remove(id_priv);
1762 cma_deref_id(id_priv);
1763 }
1764
1765 static int cma_resolve_loopback(struct rdma_id_private *id_priv)
1766 {
1767 struct cma_work *work;
1768 struct sockaddr_in *src_in, *dst_in;
1769 union ib_gid gid;
1770 int ret;
1771
1772 work = kzalloc(sizeof *work, GFP_KERNEL);
1773 if (!work)
1774 return -ENOMEM;
1775
1776 if (!id_priv->cma_dev) {
1777 ret = cma_bind_loopback(id_priv);
1778 if (ret)
1779 goto err;
1780 }
1781
1782 ib_addr_get_sgid(&id_priv->id.route.addr.dev_addr, &gid);
1783 ib_addr_set_dgid(&id_priv->id.route.addr.dev_addr, &gid);
1784
1785 if (cma_zero_addr(&id_priv->id.route.addr.src_addr)) {
1786 src_in = (struct sockaddr_in *)&id_priv->id.route.addr.src_addr;
1787 dst_in = (struct sockaddr_in *)&id_priv->id.route.addr.dst_addr;
1788 src_in->sin_family = dst_in->sin_family;
1789 src_in->sin_addr.s_addr = dst_in->sin_addr.s_addr;
1790 }
1791
1792 work->id = id_priv;
1793 INIT_WORK(&work->work, cma_work_handler);
1794 work->old_state = CMA_ADDR_QUERY;
1795 work->new_state = CMA_ADDR_RESOLVED;
1796 work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
1797 queue_work(cma_wq, &work->work);
1798 return 0;
1799 err:
1800 kfree(work);
1801 return ret;
1802 }
1803
1804 static int cma_bind_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
1805 struct sockaddr *dst_addr)
1806 {
1807 if (src_addr && src_addr->sa_family)
1808 return rdma_bind_addr(id, src_addr);
1809 else
1810 return cma_bind_any(id, dst_addr->sa_family);
1811 }
1812
1813 int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
1814 struct sockaddr *dst_addr, int timeout_ms)
1815 {
1816 struct rdma_id_private *id_priv;
1817 int ret;
1818
1819 id_priv = container_of(id, struct rdma_id_private, id);
1820 if (id_priv->state == CMA_IDLE) {
1821 ret = cma_bind_addr(id, src_addr, dst_addr);
1822 if (ret)
1823 return ret;
1824 }
1825
1826 if (!cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_ADDR_QUERY))
1827 return -EINVAL;
1828
1829 atomic_inc(&id_priv->refcount);
1830 memcpy(&id->route.addr.dst_addr, dst_addr, ip_addr_size(dst_addr));
1831 if (cma_any_addr(dst_addr))
1832 ret = cma_resolve_loopback(id_priv);
1833 else
1834 ret = rdma_resolve_ip(&addr_client, &id->route.addr.src_addr,
1835 dst_addr, &id->route.addr.dev_addr,
1836 timeout_ms, addr_handler, id_priv);
1837 if (ret)
1838 goto err;
1839
1840 return 0;
1841 err:
1842 cma_comp_exch(id_priv, CMA_ADDR_QUERY, CMA_ADDR_BOUND);
1843 cma_deref_id(id_priv);
1844 return ret;
1845 }
1846 EXPORT_SYMBOL(rdma_resolve_addr);
1847
1848 static void cma_bind_port(struct rdma_bind_list *bind_list,
1849 struct rdma_id_private *id_priv)
1850 {
1851 struct sockaddr_in *sin;
1852
1853 sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
1854 sin->sin_port = htons(bind_list->port);
1855 id_priv->bind_list = bind_list;
1856 hlist_add_head(&id_priv->node, &bind_list->owners);
1857 }
1858
1859 static int cma_alloc_port(struct idr *ps, struct rdma_id_private *id_priv,
1860 unsigned short snum)
1861 {
1862 struct rdma_bind_list *bind_list;
1863 int port, ret;
1864
1865 bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL);
1866 if (!bind_list)
1867 return -ENOMEM;
1868
1869 do {
1870 ret = idr_get_new_above(ps, bind_list, snum, &port);
1871 } while ((ret == -EAGAIN) && idr_pre_get(ps, GFP_KERNEL));
1872
1873 if (ret)
1874 goto err1;
1875
1876 if (port != snum) {
1877 ret = -EADDRNOTAVAIL;
1878 goto err2;
1879 }
1880
1881 bind_list->ps = ps;
1882 bind_list->port = (unsigned short) port;
1883 cma_bind_port(bind_list, id_priv);
1884 return 0;
1885 err2:
1886 idr_remove(ps, port);
1887 err1:
1888 kfree(bind_list);
1889 return ret;
1890 }
1891
1892 static int cma_alloc_any_port(struct idr *ps, struct rdma_id_private *id_priv)
1893 {
1894 struct rdma_bind_list *bind_list;
1895 int port, ret, low, high;
1896
1897 bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL);
1898 if (!bind_list)
1899 return -ENOMEM;
1900
1901 retry:
1902 /* FIXME: add proper port randomization per like inet_csk_get_port */
1903 do {
1904 ret = idr_get_new_above(ps, bind_list, next_port, &port);
1905 } while ((ret == -EAGAIN) && idr_pre_get(ps, GFP_KERNEL));
1906
1907 if (ret)
1908 goto err1;
1909
1910 inet_get_local_port_range(&low, &high);
1911 if (port > high) {
1912 if (next_port != low) {
1913 idr_remove(ps, port);
1914 next_port = low;
1915 goto retry;
1916 }
1917 ret = -EADDRNOTAVAIL;
1918 goto err2;
1919 }
1920
1921 if (port == high)
1922 next_port = low;
1923 else
1924 next_port = port + 1;
1925
1926 bind_list->ps = ps;
1927 bind_list->port = (unsigned short) port;
1928 cma_bind_port(bind_list, id_priv);
1929 return 0;
1930 err2:
1931 idr_remove(ps, port);
1932 err1:
1933 kfree(bind_list);
1934 return ret;
1935 }
1936
1937 static int cma_use_port(struct idr *ps, struct rdma_id_private *id_priv)
1938 {
1939 struct rdma_id_private *cur_id;
1940 struct sockaddr_in *sin, *cur_sin;
1941 struct rdma_bind_list *bind_list;
1942 struct hlist_node *node;
1943 unsigned short snum;
1944
1945 sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
1946 snum = ntohs(sin->sin_port);
1947 if (snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
1948 return -EACCES;
1949
1950 bind_list = idr_find(ps, snum);
1951 if (!bind_list)
1952 return cma_alloc_port(ps, id_priv, snum);
1953
1954 /*
1955 * We don't support binding to any address if anyone is bound to
1956 * a specific address on the same port.
1957 */
1958 if (cma_any_addr(&id_priv->id.route.addr.src_addr))
1959 return -EADDRNOTAVAIL;
1960
1961 hlist_for_each_entry(cur_id, node, &bind_list->owners, node) {
1962 if (cma_any_addr(&cur_id->id.route.addr.src_addr))
1963 return -EADDRNOTAVAIL;
1964
1965 cur_sin = (struct sockaddr_in *) &cur_id->id.route.addr.src_addr;
1966 if (sin->sin_addr.s_addr == cur_sin->sin_addr.s_addr)
1967 return -EADDRINUSE;
1968 }
1969
1970 cma_bind_port(bind_list, id_priv);
1971 return 0;
1972 }
1973
1974 static int cma_get_port(struct rdma_id_private *id_priv)
1975 {
1976 struct idr *ps;
1977 int ret;
1978
1979 switch (id_priv->id.ps) {
1980 case RDMA_PS_SDP:
1981 ps = &sdp_ps;
1982 break;
1983 case RDMA_PS_TCP:
1984 ps = &tcp_ps;
1985 break;
1986 case RDMA_PS_UDP:
1987 ps = &udp_ps;
1988 break;
1989 case RDMA_PS_IPOIB:
1990 ps = &ipoib_ps;
1991 break;
1992 default:
1993 return -EPROTONOSUPPORT;
1994 }
1995
1996 mutex_lock(&lock);
1997 if (cma_any_port(&id_priv->id.route.addr.src_addr))
1998 ret = cma_alloc_any_port(ps, id_priv);
1999 else
2000 ret = cma_use_port(ps, id_priv);
2001 mutex_unlock(&lock);
2002
2003 return ret;
2004 }
2005
2006 int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr)
2007 {
2008 struct rdma_id_private *id_priv;
2009 int ret;
2010
2011 if (addr->sa_family != AF_INET)
2012 return -EAFNOSUPPORT;
2013
2014 id_priv = container_of(id, struct rdma_id_private, id);
2015 if (!cma_comp_exch(id_priv, CMA_IDLE, CMA_ADDR_BOUND))
2016 return -EINVAL;
2017
2018 if (!cma_any_addr(addr)) {
2019 ret = rdma_translate_ip(addr, &id->route.addr.dev_addr);
2020 if (ret)
2021 goto err1;
2022
2023 mutex_lock(&lock);
2024 ret = cma_acquire_dev(id_priv);
2025 mutex_unlock(&lock);
2026 if (ret)
2027 goto err1;
2028 }
2029
2030 memcpy(&id->route.addr.src_addr, addr, ip_addr_size(addr));
2031 ret = cma_get_port(id_priv);
2032 if (ret)
2033 goto err2;
2034
2035 return 0;
2036 err2:
2037 if (!cma_any_addr(addr)) {
2038 mutex_lock(&lock);
2039 cma_detach_from_dev(id_priv);
2040 mutex_unlock(&lock);
2041 }
2042 err1:
2043 cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_IDLE);
2044 return ret;
2045 }
2046 EXPORT_SYMBOL(rdma_bind_addr);
2047
2048 static int cma_format_hdr(void *hdr, enum rdma_port_space ps,
2049 struct rdma_route *route)
2050 {
2051 struct sockaddr_in *src4, *dst4;
2052 struct cma_hdr *cma_hdr;
2053 struct sdp_hh *sdp_hdr;
2054
2055 src4 = (struct sockaddr_in *) &route->addr.src_addr;
2056 dst4 = (struct sockaddr_in *) &route->addr.dst_addr;
2057
2058 switch (ps) {
2059 case RDMA_PS_SDP:
2060 sdp_hdr = hdr;
2061 if (sdp_get_majv(sdp_hdr->sdp_version) != SDP_MAJ_VERSION)
2062 return -EINVAL;
2063 sdp_set_ip_ver(sdp_hdr, 4);
2064 sdp_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
2065 sdp_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
2066 sdp_hdr->port = src4->sin_port;
2067 break;
2068 default:
2069 cma_hdr = hdr;
2070 cma_hdr->cma_version = CMA_VERSION;
2071 cma_set_ip_ver(cma_hdr, 4);
2072 cma_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
2073 cma_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
2074 cma_hdr->port = src4->sin_port;
2075 break;
2076 }
2077 return 0;
2078 }
2079
2080 static int cma_sidr_rep_handler(struct ib_cm_id *cm_id,
2081 struct ib_cm_event *ib_event)
2082 {
2083 struct rdma_id_private *id_priv = cm_id->context;
2084 struct rdma_cm_event event;
2085 struct ib_cm_sidr_rep_event_param *rep = &ib_event->param.sidr_rep_rcvd;
2086 int ret = 0;
2087
2088 if (cma_disable_remove(id_priv, CMA_CONNECT))
2089 return 0;
2090
2091 memset(&event, 0, sizeof event);
2092 switch (ib_event->event) {
2093 case IB_CM_SIDR_REQ_ERROR:
2094 event.event = RDMA_CM_EVENT_UNREACHABLE;
2095 event.status = -ETIMEDOUT;
2096 break;
2097 case IB_CM_SIDR_REP_RECEIVED:
2098 event.param.ud.private_data = ib_event->private_data;
2099 event.param.ud.private_data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
2100 if (rep->status != IB_SIDR_SUCCESS) {
2101 event.event = RDMA_CM_EVENT_UNREACHABLE;
2102 event.status = ib_event->param.sidr_rep_rcvd.status;
2103 break;
2104 }
2105 if (id_priv->qkey != rep->qkey) {
2106 event.event = RDMA_CM_EVENT_UNREACHABLE;
2107 event.status = -EINVAL;
2108 break;
2109 }
2110 ib_init_ah_from_path(id_priv->id.device, id_priv->id.port_num,
2111 id_priv->id.route.path_rec,
2112 &event.param.ud.ah_attr);
2113 event.param.ud.qp_num = rep->qpn;
2114 event.param.ud.qkey = rep->qkey;
2115 event.event = RDMA_CM_EVENT_ESTABLISHED;
2116 event.status = 0;
2117 break;
2118 default:
2119 printk(KERN_ERR "RDMA CMA: unexpected IB CM event: %d",
2120 ib_event->event);
2121 goto out;
2122 }
2123
2124 ret = id_priv->id.event_handler(&id_priv->id, &event);
2125 if (ret) {
2126 /* Destroy the CM ID by returning a non-zero value. */
2127 id_priv->cm_id.ib = NULL;
2128 cma_exch(id_priv, CMA_DESTROYING);
2129 cma_enable_remove(id_priv);
2130 rdma_destroy_id(&id_priv->id);
2131 return ret;
2132 }
2133 out:
2134 cma_enable_remove(id_priv);
2135 return ret;
2136 }
2137
2138 static int cma_resolve_ib_udp(struct rdma_id_private *id_priv,
2139 struct rdma_conn_param *conn_param)
2140 {
2141 struct ib_cm_sidr_req_param req;
2142 struct rdma_route *route;
2143 int ret;
2144
2145 req.private_data_len = sizeof(struct cma_hdr) +
2146 conn_param->private_data_len;
2147 req.private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
2148 if (!req.private_data)
2149 return -ENOMEM;
2150
2151 if (conn_param->private_data && conn_param->private_data_len)
2152 memcpy((void *) req.private_data + sizeof(struct cma_hdr),
2153 conn_param->private_data, conn_param->private_data_len);
2154
2155 route = &id_priv->id.route;
2156 ret = cma_format_hdr((void *) req.private_data, id_priv->id.ps, route);
2157 if (ret)
2158 goto out;
2159
2160 id_priv->cm_id.ib = ib_create_cm_id(id_priv->id.device,
2161 cma_sidr_rep_handler, id_priv);
2162 if (IS_ERR(id_priv->cm_id.ib)) {
2163 ret = PTR_ERR(id_priv->cm_id.ib);
2164 goto out;
2165 }
2166
2167 req.path = route->path_rec;
2168 req.service_id = cma_get_service_id(id_priv->id.ps,
2169 &route->addr.dst_addr);
2170 req.timeout_ms = 1 << (CMA_CM_RESPONSE_TIMEOUT - 8);
2171 req.max_cm_retries = CMA_MAX_CM_RETRIES;
2172
2173 ret = ib_send_cm_sidr_req(id_priv->cm_id.ib, &req);
2174 if (ret) {
2175 ib_destroy_cm_id(id_priv->cm_id.ib);
2176 id_priv->cm_id.ib = NULL;
2177 }
2178 out:
2179 kfree(req.private_data);
2180 return ret;
2181 }
2182
2183 static int cma_connect_ib(struct rdma_id_private *id_priv,
2184 struct rdma_conn_param *conn_param)
2185 {
2186 struct ib_cm_req_param req;
2187 struct rdma_route *route;
2188 void *private_data;
2189 int offset, ret;
2190
2191 memset(&req, 0, sizeof req);
2192 offset = cma_user_data_offset(id_priv->id.ps);
2193 req.private_data_len = offset + conn_param->private_data_len;
2194 private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
2195 if (!private_data)
2196 return -ENOMEM;
2197
2198 if (conn_param->private_data && conn_param->private_data_len)
2199 memcpy(private_data + offset, conn_param->private_data,
2200 conn_param->private_data_len);
2201
2202 id_priv->cm_id.ib = ib_create_cm_id(id_priv->id.device, cma_ib_handler,
2203 id_priv);
2204 if (IS_ERR(id_priv->cm_id.ib)) {
2205 ret = PTR_ERR(id_priv->cm_id.ib);
2206 goto out;
2207 }
2208
2209 route = &id_priv->id.route;
2210 ret = cma_format_hdr(private_data, id_priv->id.ps, route);
2211 if (ret)
2212 goto out;
2213 req.private_data = private_data;
2214
2215 req.primary_path = &route->path_rec[0];
2216 if (route->num_paths == 2)
2217 req.alternate_path = &route->path_rec[1];
2218
2219 req.service_id = cma_get_service_id(id_priv->id.ps,
2220 &route->addr.dst_addr);
2221 req.qp_num = id_priv->qp_num;
2222 req.qp_type = IB_QPT_RC;
2223 req.starting_psn = id_priv->seq_num;
2224 req.responder_resources = conn_param->responder_resources;
2225 req.initiator_depth = conn_param->initiator_depth;
2226 req.flow_control = conn_param->flow_control;
2227 req.retry_count = conn_param->retry_count;
2228 req.rnr_retry_count = conn_param->rnr_retry_count;
2229 req.remote_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
2230 req.local_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
2231 req.max_cm_retries = CMA_MAX_CM_RETRIES;
2232 req.srq = id_priv->srq ? 1 : 0;
2233
2234 ret = ib_send_cm_req(id_priv->cm_id.ib, &req);
2235 out:
2236 if (ret && !IS_ERR(id_priv->cm_id.ib)) {
2237 ib_destroy_cm_id(id_priv->cm_id.ib);
2238 id_priv->cm_id.ib = NULL;
2239 }
2240
2241 kfree(private_data);
2242 return ret;
2243 }
2244
2245 static int cma_connect_iw(struct rdma_id_private *id_priv,
2246 struct rdma_conn_param *conn_param)
2247 {
2248 struct iw_cm_id *cm_id;
2249 struct sockaddr_in* sin;
2250 int ret;
2251 struct iw_cm_conn_param iw_param;
2252
2253 cm_id = iw_create_cm_id(id_priv->id.device, cma_iw_handler, id_priv);
2254 if (IS_ERR(cm_id)) {
2255 ret = PTR_ERR(cm_id);
2256 goto out;
2257 }
2258
2259 id_priv->cm_id.iw = cm_id;
2260
2261 sin = (struct sockaddr_in*) &id_priv->id.route.addr.src_addr;
2262 cm_id->local_addr = *sin;
2263
2264 sin = (struct sockaddr_in*) &id_priv->id.route.addr.dst_addr;
2265 cm_id->remote_addr = *sin;
2266
2267 ret = cma_modify_qp_rtr(&id_priv->id);
2268 if (ret)
2269 goto out;
2270
2271 iw_param.ord = conn_param->initiator_depth;
2272 iw_param.ird = conn_param->responder_resources;
2273 iw_param.private_data = conn_param->private_data;
2274 iw_param.private_data_len = conn_param->private_data_len;
2275 if (id_priv->id.qp)
2276 iw_param.qpn = id_priv->qp_num;
2277 else
2278 iw_param.qpn = conn_param->qp_num;
2279 ret = iw_cm_connect(cm_id, &iw_param);
2280 out:
2281 if (ret && !IS_ERR(cm_id)) {
2282 iw_destroy_cm_id(cm_id);
2283 id_priv->cm_id.iw = NULL;
2284 }
2285 return ret;
2286 }
2287
2288 int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
2289 {
2290 struct rdma_id_private *id_priv;
2291 int ret;
2292
2293 id_priv = container_of(id, struct rdma_id_private, id);
2294 if (!cma_comp_exch(id_priv, CMA_ROUTE_RESOLVED, CMA_CONNECT))
2295 return -EINVAL;
2296
2297 if (!id->qp) {
2298 id_priv->qp_num = conn_param->qp_num;
2299 id_priv->srq = conn_param->srq;
2300 }
2301
2302 switch (rdma_node_get_transport(id->device->node_type)) {
2303 case RDMA_TRANSPORT_IB:
2304 if (cma_is_ud_ps(id->ps))
2305 ret = cma_resolve_ib_udp(id_priv, conn_param);
2306 else
2307 ret = cma_connect_ib(id_priv, conn_param);
2308 break;
2309 case RDMA_TRANSPORT_IWARP:
2310 ret = cma_connect_iw(id_priv, conn_param);
2311 break;
2312 default:
2313 ret = -ENOSYS;
2314 break;
2315 }
2316 if (ret)
2317 goto err;
2318
2319 return 0;
2320 err:
2321 cma_comp_exch(id_priv, CMA_CONNECT, CMA_ROUTE_RESOLVED);
2322 return ret;
2323 }
2324 EXPORT_SYMBOL(rdma_connect);
2325
2326 static int cma_accept_ib(struct rdma_id_private *id_priv,
2327 struct rdma_conn_param *conn_param)
2328 {
2329 struct ib_cm_rep_param rep;
2330 struct ib_qp_attr qp_attr;
2331 int qp_attr_mask, ret;
2332
2333 if (id_priv->id.qp) {
2334 ret = cma_modify_qp_rtr(&id_priv->id);
2335 if (ret)
2336 goto out;
2337
2338 qp_attr.qp_state = IB_QPS_RTS;
2339 ret = ib_cm_init_qp_attr(id_priv->cm_id.ib, &qp_attr,
2340 &qp_attr_mask);
2341 if (ret)
2342 goto out;
2343
2344 qp_attr.max_rd_atomic = conn_param->initiator_depth;
2345 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
2346 if (ret)
2347 goto out;
2348 }
2349
2350 memset(&rep, 0, sizeof rep);
2351 rep.qp_num = id_priv->qp_num;
2352 rep.starting_psn = id_priv->seq_num;
2353 rep.private_data = conn_param->private_data;
2354 rep.private_data_len = conn_param->private_data_len;
2355 rep.responder_resources = conn_param->responder_resources;
2356 rep.initiator_depth = conn_param->initiator_depth;
2357 rep.failover_accepted = 0;
2358 rep.flow_control = conn_param->flow_control;
2359 rep.rnr_retry_count = conn_param->rnr_retry_count;
2360 rep.srq = id_priv->srq ? 1 : 0;
2361
2362 ret = ib_send_cm_rep(id_priv->cm_id.ib, &rep);
2363 out:
2364 return ret;
2365 }
2366
2367 static int cma_accept_iw(struct rdma_id_private *id_priv,
2368 struct rdma_conn_param *conn_param)
2369 {
2370 struct iw_cm_conn_param iw_param;
2371 int ret;
2372
2373 ret = cma_modify_qp_rtr(&id_priv->id);
2374 if (ret)
2375 return ret;
2376
2377 iw_param.ord = conn_param->initiator_depth;
2378 iw_param.ird = conn_param->responder_resources;
2379 iw_param.private_data = conn_param->private_data;
2380 iw_param.private_data_len = conn_param->private_data_len;
2381 if (id_priv->id.qp) {
2382 iw_param.qpn = id_priv->qp_num;
2383 } else
2384 iw_param.qpn = conn_param->qp_num;
2385
2386 return iw_cm_accept(id_priv->cm_id.iw, &iw_param);
2387 }
2388
2389 static int cma_send_sidr_rep(struct rdma_id_private *id_priv,
2390 enum ib_cm_sidr_status status,
2391 const void *private_data, int private_data_len)
2392 {
2393 struct ib_cm_sidr_rep_param rep;
2394
2395 memset(&rep, 0, sizeof rep);
2396 rep.status = status;
2397 if (status == IB_SIDR_SUCCESS) {
2398 rep.qp_num = id_priv->qp_num;
2399 rep.qkey = id_priv->qkey;
2400 }
2401 rep.private_data = private_data;
2402 rep.private_data_len = private_data_len;
2403
2404 return ib_send_cm_sidr_rep(id_priv->cm_id.ib, &rep);
2405 }
2406
2407 int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
2408 {
2409 struct rdma_id_private *id_priv;
2410 int ret;
2411
2412 id_priv = container_of(id, struct rdma_id_private, id);
2413 if (!cma_comp(id_priv, CMA_CONNECT))
2414 return -EINVAL;
2415
2416 if (!id->qp && conn_param) {
2417 id_priv->qp_num = conn_param->qp_num;
2418 id_priv->srq = conn_param->srq;
2419 }
2420
2421 switch (rdma_node_get_transport(id->device->node_type)) {
2422 case RDMA_TRANSPORT_IB:
2423 if (cma_is_ud_ps(id->ps))
2424 ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
2425 conn_param->private_data,
2426 conn_param->private_data_len);
2427 else if (conn_param)
2428 ret = cma_accept_ib(id_priv, conn_param);
2429 else
2430 ret = cma_rep_recv(id_priv);
2431 break;
2432 case RDMA_TRANSPORT_IWARP:
2433 ret = cma_accept_iw(id_priv, conn_param);
2434 break;
2435 default:
2436 ret = -ENOSYS;
2437 break;
2438 }
2439
2440 if (ret)
2441 goto reject;
2442
2443 return 0;
2444 reject:
2445 cma_modify_qp_err(id);
2446 rdma_reject(id, NULL, 0);
2447 return ret;
2448 }
2449 EXPORT_SYMBOL(rdma_accept);
2450
2451 int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event)
2452 {
2453 struct rdma_id_private *id_priv;
2454 int ret;
2455
2456 id_priv = container_of(id, struct rdma_id_private, id);
2457 if (!cma_has_cm_dev(id_priv))
2458 return -EINVAL;
2459
2460 switch (id->device->node_type) {
2461 case RDMA_NODE_IB_CA:
2462 ret = ib_cm_notify(id_priv->cm_id.ib, event);
2463 break;
2464 default:
2465 ret = 0;
2466 break;
2467 }
2468 return ret;
2469 }
2470 EXPORT_SYMBOL(rdma_notify);
2471
2472 int rdma_reject(struct rdma_cm_id *id, const void *private_data,
2473 u8 private_data_len)
2474 {
2475 struct rdma_id_private *id_priv;
2476 int ret;
2477
2478 id_priv = container_of(id, struct rdma_id_private, id);
2479 if (!cma_has_cm_dev(id_priv))
2480 return -EINVAL;
2481
2482 switch (rdma_node_get_transport(id->device->node_type)) {
2483 case RDMA_TRANSPORT_IB:
2484 if (cma_is_ud_ps(id->ps))
2485 ret = cma_send_sidr_rep(id_priv, IB_SIDR_REJECT,
2486 private_data, private_data_len);
2487 else
2488 ret = ib_send_cm_rej(id_priv->cm_id.ib,
2489 IB_CM_REJ_CONSUMER_DEFINED, NULL,
2490 0, private_data, private_data_len);
2491 break;
2492 case RDMA_TRANSPORT_IWARP:
2493 ret = iw_cm_reject(id_priv->cm_id.iw,
2494 private_data, private_data_len);
2495 break;
2496 default:
2497 ret = -ENOSYS;
2498 break;
2499 }
2500 return ret;
2501 }
2502 EXPORT_SYMBOL(rdma_reject);
2503
2504 int rdma_disconnect(struct rdma_cm_id *id)
2505 {
2506 struct rdma_id_private *id_priv;
2507 int ret;
2508
2509 id_priv = container_of(id, struct rdma_id_private, id);
2510 if (!cma_has_cm_dev(id_priv))
2511 return -EINVAL;
2512
2513 switch (rdma_node_get_transport(id->device->node_type)) {
2514 case RDMA_TRANSPORT_IB:
2515 ret = cma_modify_qp_err(id);
2516 if (ret)
2517 goto out;
2518 /* Initiate or respond to a disconnect. */
2519 if (ib_send_cm_dreq(id_priv->cm_id.ib, NULL, 0))
2520 ib_send_cm_drep(id_priv->cm_id.ib, NULL, 0);
2521 break;
2522 case RDMA_TRANSPORT_IWARP:
2523 ret = iw_cm_disconnect(id_priv->cm_id.iw, 0);
2524 break;
2525 default:
2526 ret = -EINVAL;
2527 break;
2528 }
2529 out:
2530 return ret;
2531 }
2532 EXPORT_SYMBOL(rdma_disconnect);
2533
2534 static int cma_ib_mc_handler(int status, struct ib_sa_multicast *multicast)
2535 {
2536 struct rdma_id_private *id_priv;
2537 struct cma_multicast *mc = multicast->context;
2538 struct rdma_cm_event event;
2539 int ret;
2540
2541 id_priv = mc->id_priv;
2542 if (cma_disable_remove(id_priv, CMA_ADDR_BOUND) &&
2543 cma_disable_remove(id_priv, CMA_ADDR_RESOLVED))
2544 return 0;
2545
2546 if (!status && id_priv->id.qp)
2547 status = ib_attach_mcast(id_priv->id.qp, &multicast->rec.mgid,
2548 multicast->rec.mlid);
2549
2550 memset(&event, 0, sizeof event);
2551 event.status = status;
2552 event.param.ud.private_data = mc->context;
2553 if (!status) {
2554 event.event = RDMA_CM_EVENT_MULTICAST_JOIN;
2555 ib_init_ah_from_mcmember(id_priv->id.device,
2556 id_priv->id.port_num, &multicast->rec,
2557 &event.param.ud.ah_attr);
2558 event.param.ud.qp_num = 0xFFFFFF;
2559 event.param.ud.qkey = be32_to_cpu(multicast->rec.qkey);
2560 } else
2561 event.event = RDMA_CM_EVENT_MULTICAST_ERROR;
2562
2563 ret = id_priv->id.event_handler(&id_priv->id, &event);
2564 if (ret) {
2565 cma_exch(id_priv, CMA_DESTROYING);
2566 cma_enable_remove(id_priv);
2567 rdma_destroy_id(&id_priv->id);
2568 return 0;
2569 }
2570
2571 cma_enable_remove(id_priv);
2572 return 0;
2573 }
2574
2575 static void cma_set_mgid(struct rdma_id_private *id_priv,
2576 struct sockaddr *addr, union ib_gid *mgid)
2577 {
2578 unsigned char mc_map[MAX_ADDR_LEN];
2579 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
2580 struct sockaddr_in *sin = (struct sockaddr_in *) addr;
2581 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) addr;
2582
2583 if (cma_any_addr(addr)) {
2584 memset(mgid, 0, sizeof *mgid);
2585 } else if ((addr->sa_family == AF_INET6) &&
2586 ((be32_to_cpu(sin6->sin6_addr.s6_addr32[0]) & 0xFF10A01B) ==
2587 0xFF10A01B)) {
2588 /* IPv6 address is an SA assigned MGID. */
2589 memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
2590 } else {
2591 ip_ib_mc_map(sin->sin_addr.s_addr, mc_map);
2592 if (id_priv->id.ps == RDMA_PS_UDP)
2593 mc_map[7] = 0x01; /* Use RDMA CM signature */
2594 mc_map[8] = ib_addr_get_pkey(dev_addr) >> 8;
2595 mc_map[9] = (unsigned char) ib_addr_get_pkey(dev_addr);
2596 *mgid = *(union ib_gid *) (mc_map + 4);
2597 }
2598 }
2599
2600 static int cma_join_ib_multicast(struct rdma_id_private *id_priv,
2601 struct cma_multicast *mc)
2602 {
2603 struct ib_sa_mcmember_rec rec;
2604 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
2605 ib_sa_comp_mask comp_mask;
2606 int ret;
2607
2608 ib_addr_get_mgid(dev_addr, &rec.mgid);
2609 ret = ib_sa_get_mcmember_rec(id_priv->id.device, id_priv->id.port_num,
2610 &rec.mgid, &rec);
2611 if (ret)
2612 return ret;
2613
2614 cma_set_mgid(id_priv, &mc->addr, &rec.mgid);
2615 if (id_priv->id.ps == RDMA_PS_UDP)
2616 rec.qkey = cpu_to_be32(RDMA_UDP_QKEY);
2617 ib_addr_get_sgid(dev_addr, &rec.port_gid);
2618 rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
2619 rec.join_state = 1;
2620
2621 comp_mask = IB_SA_MCMEMBER_REC_MGID | IB_SA_MCMEMBER_REC_PORT_GID |
2622 IB_SA_MCMEMBER_REC_PKEY | IB_SA_MCMEMBER_REC_JOIN_STATE |
2623 IB_SA_MCMEMBER_REC_QKEY | IB_SA_MCMEMBER_REC_SL |
2624 IB_SA_MCMEMBER_REC_FLOW_LABEL |
2625 IB_SA_MCMEMBER_REC_TRAFFIC_CLASS;
2626
2627 mc->multicast.ib = ib_sa_join_multicast(&sa_client, id_priv->id.device,
2628 id_priv->id.port_num, &rec,
2629 comp_mask, GFP_KERNEL,
2630 cma_ib_mc_handler, mc);
2631 if (IS_ERR(mc->multicast.ib))
2632 return PTR_ERR(mc->multicast.ib);
2633
2634 return 0;
2635 }
2636
2637 int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
2638 void *context)
2639 {
2640 struct rdma_id_private *id_priv;
2641 struct cma_multicast *mc;
2642 int ret;
2643
2644 id_priv = container_of(id, struct rdma_id_private, id);
2645 if (!cma_comp(id_priv, CMA_ADDR_BOUND) &&
2646 !cma_comp(id_priv, CMA_ADDR_RESOLVED))
2647 return -EINVAL;
2648
2649 mc = kmalloc(sizeof *mc, GFP_KERNEL);
2650 if (!mc)
2651 return -ENOMEM;
2652
2653 memcpy(&mc->addr, addr, ip_addr_size(addr));
2654 mc->context = context;
2655 mc->id_priv = id_priv;
2656
2657 spin_lock(&id_priv->lock);
2658 list_add(&mc->list, &id_priv->mc_list);
2659 spin_unlock(&id_priv->lock);
2660
2661 switch (rdma_node_get_transport(id->device->node_type)) {
2662 case RDMA_TRANSPORT_IB:
2663 ret = cma_join_ib_multicast(id_priv, mc);
2664 break;
2665 default:
2666 ret = -ENOSYS;
2667 break;
2668 }
2669
2670 if (ret) {
2671 spin_lock_irq(&id_priv->lock);
2672 list_del(&mc->list);
2673 spin_unlock_irq(&id_priv->lock);
2674 kfree(mc);
2675 }
2676 return ret;
2677 }
2678 EXPORT_SYMBOL(rdma_join_multicast);
2679
2680 void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr)
2681 {
2682 struct rdma_id_private *id_priv;
2683 struct cma_multicast *mc;
2684
2685 id_priv = container_of(id, struct rdma_id_private, id);
2686 spin_lock_irq(&id_priv->lock);
2687 list_for_each_entry(mc, &id_priv->mc_list, list) {
2688 if (!memcmp(&mc->addr, addr, ip_addr_size(addr))) {
2689 list_del(&mc->list);
2690 spin_unlock_irq(&id_priv->lock);
2691
2692 if (id->qp)
2693 ib_detach_mcast(id->qp,
2694 &mc->multicast.ib->rec.mgid,
2695 mc->multicast.ib->rec.mlid);
2696 ib_sa_free_multicast(mc->multicast.ib);
2697 kfree(mc);
2698 return;
2699 }
2700 }
2701 spin_unlock_irq(&id_priv->lock);
2702 }
2703 EXPORT_SYMBOL(rdma_leave_multicast);
2704
2705 static void cma_add_one(struct ib_device *device)
2706 {
2707 struct cma_device *cma_dev;
2708 struct rdma_id_private *id_priv;
2709
2710 cma_dev = kmalloc(sizeof *cma_dev, GFP_KERNEL);
2711 if (!cma_dev)
2712 return;
2713
2714 cma_dev->device = device;
2715
2716 init_completion(&cma_dev->comp);
2717 atomic_set(&cma_dev->refcount, 1);
2718 INIT_LIST_HEAD(&cma_dev->id_list);
2719 ib_set_client_data(device, &cma_client, cma_dev);
2720
2721 mutex_lock(&lock);
2722 list_add_tail(&cma_dev->list, &dev_list);
2723 list_for_each_entry(id_priv, &listen_any_list, list)
2724 cma_listen_on_dev(id_priv, cma_dev);
2725 mutex_unlock(&lock);
2726 }
2727
2728 static int cma_remove_id_dev(struct rdma_id_private *id_priv)
2729 {
2730 struct rdma_cm_event event;
2731 enum cma_state state;
2732
2733 /* Record that we want to remove the device */
2734 state = cma_exch(id_priv, CMA_DEVICE_REMOVAL);
2735 if (state == CMA_DESTROYING)
2736 return 0;
2737
2738 cma_cancel_operation(id_priv, state);
2739 wait_event(id_priv->wait_remove, !atomic_read(&id_priv->dev_remove));
2740
2741 /* Check for destruction from another callback. */
2742 if (!cma_comp(id_priv, CMA_DEVICE_REMOVAL))
2743 return 0;
2744
2745 memset(&event, 0, sizeof event);
2746 event.event = RDMA_CM_EVENT_DEVICE_REMOVAL;
2747 return id_priv->id.event_handler(&id_priv->id, &event);
2748 }
2749
2750 static void cma_process_remove(struct cma_device *cma_dev)
2751 {
2752 struct rdma_id_private *id_priv;
2753 int ret;
2754
2755 mutex_lock(&lock);
2756 while (!list_empty(&cma_dev->id_list)) {
2757 id_priv = list_entry(cma_dev->id_list.next,
2758 struct rdma_id_private, list);
2759
2760 if (cma_internal_listen(id_priv)) {
2761 cma_destroy_listen(id_priv);
2762 continue;
2763 }
2764
2765 list_del_init(&id_priv->list);
2766 atomic_inc(&id_priv->refcount);
2767 mutex_unlock(&lock);
2768
2769 ret = cma_remove_id_dev(id_priv);
2770 cma_deref_id(id_priv);
2771 if (ret)
2772 rdma_destroy_id(&id_priv->id);
2773
2774 mutex_lock(&lock);
2775 }
2776 mutex_unlock(&lock);
2777
2778 cma_deref_dev(cma_dev);
2779 wait_for_completion(&cma_dev->comp);
2780 }
2781
2782 static void cma_remove_one(struct ib_device *device)
2783 {
2784 struct cma_device *cma_dev;
2785
2786 cma_dev = ib_get_client_data(device, &cma_client);
2787 if (!cma_dev)
2788 return;
2789
2790 mutex_lock(&lock);
2791 list_del(&cma_dev->list);
2792 mutex_unlock(&lock);
2793
2794 cma_process_remove(cma_dev);
2795 kfree(cma_dev);
2796 }
2797
2798 static int cma_init(void)
2799 {
2800 int ret, low, high;
2801
2802 get_random_bytes(&next_port, sizeof next_port);
2803 inet_get_local_port_range(&low, &high);
2804 next_port = ((unsigned int) next_port % (high - low)) + low;
2805
2806 cma_wq = create_singlethread_workqueue("rdma_cm");
2807 if (!cma_wq)
2808 return -ENOMEM;
2809
2810 ib_sa_register_client(&sa_client);
2811 rdma_addr_register_client(&addr_client);
2812
2813 ret = ib_register_client(&cma_client);
2814 if (ret)
2815 goto err;
2816 return 0;
2817
2818 err:
2819 rdma_addr_unregister_client(&addr_client);
2820 ib_sa_unregister_client(&sa_client);
2821 destroy_workqueue(cma_wq);
2822 return ret;
2823 }
2824
2825 static void cma_cleanup(void)
2826 {
2827 ib_unregister_client(&cma_client);
2828 rdma_addr_unregister_client(&addr_client);
2829 ib_sa_unregister_client(&sa_client);
2830 destroy_workqueue(cma_wq);
2831 idr_destroy(&sdp_ps);
2832 idr_destroy(&tcp_ps);
2833 idr_destroy(&udp_ps);
2834 idr_destroy(&ipoib_ps);
2835 }
2836
2837 module_init(cma_init);
2838 module_exit(cma_cleanup);
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