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0751697ef984a87e7f688238a10760127fd7383f
[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 #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; /* listen_any_list or cma_device.list */
118 struct list_head listen_list; /* per device listens */
119 struct cma_device *cma_dev;
120 struct list_head mc_list;
121
122 int internal_id;
123 enum cma_state state;
124 spinlock_t lock;
125 struct mutex qp_mutex;
126
127 struct completion comp;
128 atomic_t refcount;
129 wait_queue_head_t wait_remove;
130 atomic_t dev_remove;
131
132 int backlog;
133 int timeout_ms;
134 struct ib_sa_query *query;
135 int query_id;
136 union {
137 struct ib_cm_id *ib;
138 struct iw_cm_id *iw;
139 } cm_id;
140
141 u32 seq_num;
142 u32 qkey;
143 u32 qp_num;
144 u8 srq;
145 u8 tos;
146 };
147
148 struct cma_multicast {
149 struct rdma_id_private *id_priv;
150 union {
151 struct ib_sa_multicast *ib;
152 } multicast;
153 struct list_head list;
154 void *context;
155 struct sockaddr addr;
156 u8 pad[sizeof(struct sockaddr_in6) -
157 sizeof(struct sockaddr)];
158 };
159
160 struct cma_work {
161 struct work_struct work;
162 struct rdma_id_private *id;
163 enum cma_state old_state;
164 enum cma_state new_state;
165 struct rdma_cm_event event;
166 };
167
168 union cma_ip_addr {
169 struct in6_addr ip6;
170 struct {
171 __u32 pad[3];
172 __u32 addr;
173 } ip4;
174 };
175
176 struct cma_hdr {
177 u8 cma_version;
178 u8 ip_version; /* IP version: 7:4 */
179 __u16 port;
180 union cma_ip_addr src_addr;
181 union cma_ip_addr dst_addr;
182 };
183
184 struct sdp_hh {
185 u8 bsdh[16];
186 u8 sdp_version; /* Major version: 7:4 */
187 u8 ip_version; /* IP version: 7:4 */
188 u8 sdp_specific1[10];
189 __u16 port;
190 __u16 sdp_specific2;
191 union cma_ip_addr src_addr;
192 union cma_ip_addr dst_addr;
193 };
194
195 struct sdp_hah {
196 u8 bsdh[16];
197 u8 sdp_version;
198 };
199
200 #define CMA_VERSION 0x00
201 #define SDP_MAJ_VERSION 0x2
202
203 static int cma_comp(struct rdma_id_private *id_priv, enum cma_state comp)
204 {
205 unsigned long flags;
206 int ret;
207
208 spin_lock_irqsave(&id_priv->lock, flags);
209 ret = (id_priv->state == comp);
210 spin_unlock_irqrestore(&id_priv->lock, flags);
211 return ret;
212 }
213
214 static int cma_comp_exch(struct rdma_id_private *id_priv,
215 enum cma_state comp, enum cma_state exch)
216 {
217 unsigned long flags;
218 int ret;
219
220 spin_lock_irqsave(&id_priv->lock, flags);
221 if ((ret = (id_priv->state == comp)))
222 id_priv->state = exch;
223 spin_unlock_irqrestore(&id_priv->lock, flags);
224 return ret;
225 }
226
227 static enum cma_state cma_exch(struct rdma_id_private *id_priv,
228 enum cma_state exch)
229 {
230 unsigned long flags;
231 enum cma_state old;
232
233 spin_lock_irqsave(&id_priv->lock, flags);
234 old = id_priv->state;
235 id_priv->state = exch;
236 spin_unlock_irqrestore(&id_priv->lock, flags);
237 return old;
238 }
239
240 static inline u8 cma_get_ip_ver(struct cma_hdr *hdr)
241 {
242 return hdr->ip_version >> 4;
243 }
244
245 static inline void cma_set_ip_ver(struct cma_hdr *hdr, u8 ip_ver)
246 {
247 hdr->ip_version = (ip_ver << 4) | (hdr->ip_version & 0xF);
248 }
249
250 static inline u8 sdp_get_majv(u8 sdp_version)
251 {
252 return sdp_version >> 4;
253 }
254
255 static inline u8 sdp_get_ip_ver(struct sdp_hh *hh)
256 {
257 return hh->ip_version >> 4;
258 }
259
260 static inline void sdp_set_ip_ver(struct sdp_hh *hh, u8 ip_ver)
261 {
262 hh->ip_version = (ip_ver << 4) | (hh->ip_version & 0xF);
263 }
264
265 static inline int cma_is_ud_ps(enum rdma_port_space ps)
266 {
267 return (ps == RDMA_PS_UDP || ps == RDMA_PS_IPOIB);
268 }
269
270 static void cma_attach_to_dev(struct rdma_id_private *id_priv,
271 struct cma_device *cma_dev)
272 {
273 atomic_inc(&cma_dev->refcount);
274 id_priv->cma_dev = cma_dev;
275 id_priv->id.device = cma_dev->device;
276 list_add_tail(&id_priv->list, &cma_dev->id_list);
277 }
278
279 static inline void cma_deref_dev(struct cma_device *cma_dev)
280 {
281 if (atomic_dec_and_test(&cma_dev->refcount))
282 complete(&cma_dev->comp);
283 }
284
285 static void cma_detach_from_dev(struct rdma_id_private *id_priv)
286 {
287 list_del(&id_priv->list);
288 cma_deref_dev(id_priv->cma_dev);
289 id_priv->cma_dev = NULL;
290 }
291
292 static int cma_set_qkey(struct ib_device *device, u8 port_num,
293 enum rdma_port_space ps,
294 struct rdma_dev_addr *dev_addr, u32 *qkey)
295 {
296 struct ib_sa_mcmember_rec rec;
297 int ret = 0;
298
299 switch (ps) {
300 case RDMA_PS_UDP:
301 *qkey = RDMA_UDP_QKEY;
302 break;
303 case RDMA_PS_IPOIB:
304 ib_addr_get_mgid(dev_addr, &rec.mgid);
305 ret = ib_sa_get_mcmember_rec(device, port_num, &rec.mgid, &rec);
306 *qkey = be32_to_cpu(rec.qkey);
307 break;
308 default:
309 break;
310 }
311 return ret;
312 }
313
314 static int cma_acquire_dev(struct rdma_id_private *id_priv)
315 {
316 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
317 struct cma_device *cma_dev;
318 union ib_gid gid;
319 int ret = -ENODEV;
320
321 switch (rdma_node_get_transport(dev_addr->dev_type)) {
322 case RDMA_TRANSPORT_IB:
323 ib_addr_get_sgid(dev_addr, &gid);
324 break;
325 case RDMA_TRANSPORT_IWARP:
326 iw_addr_get_sgid(dev_addr, &gid);
327 break;
328 default:
329 return -ENODEV;
330 }
331
332 list_for_each_entry(cma_dev, &dev_list, list) {
333 ret = ib_find_cached_gid(cma_dev->device, &gid,
334 &id_priv->id.port_num, NULL);
335 if (!ret) {
336 ret = cma_set_qkey(cma_dev->device,
337 id_priv->id.port_num,
338 id_priv->id.ps, dev_addr,
339 &id_priv->qkey);
340 if (!ret)
341 cma_attach_to_dev(id_priv, cma_dev);
342 break;
343 }
344 }
345 return ret;
346 }
347
348 static void cma_deref_id(struct rdma_id_private *id_priv)
349 {
350 if (atomic_dec_and_test(&id_priv->refcount))
351 complete(&id_priv->comp);
352 }
353
354 static int cma_disable_remove(struct rdma_id_private *id_priv,
355 enum cma_state state)
356 {
357 unsigned long flags;
358 int ret;
359
360 spin_lock_irqsave(&id_priv->lock, flags);
361 if (id_priv->state == state) {
362 atomic_inc(&id_priv->dev_remove);
363 ret = 0;
364 } else
365 ret = -EINVAL;
366 spin_unlock_irqrestore(&id_priv->lock, flags);
367 return ret;
368 }
369
370 static void cma_enable_remove(struct rdma_id_private *id_priv)
371 {
372 if (atomic_dec_and_test(&id_priv->dev_remove))
373 wake_up(&id_priv->wait_remove);
374 }
375
376 static int cma_has_cm_dev(struct rdma_id_private *id_priv)
377 {
378 return (id_priv->id.device && id_priv->cm_id.ib);
379 }
380
381 struct rdma_cm_id *rdma_create_id(rdma_cm_event_handler event_handler,
382 void *context, enum rdma_port_space ps)
383 {
384 struct rdma_id_private *id_priv;
385
386 id_priv = kzalloc(sizeof *id_priv, GFP_KERNEL);
387 if (!id_priv)
388 return ERR_PTR(-ENOMEM);
389
390 id_priv->state = CMA_IDLE;
391 id_priv->id.context = context;
392 id_priv->id.event_handler = event_handler;
393 id_priv->id.ps = ps;
394 spin_lock_init(&id_priv->lock);
395 mutex_init(&id_priv->qp_mutex);
396 init_completion(&id_priv->comp);
397 atomic_set(&id_priv->refcount, 1);
398 init_waitqueue_head(&id_priv->wait_remove);
399 atomic_set(&id_priv->dev_remove, 0);
400 INIT_LIST_HEAD(&id_priv->listen_list);
401 INIT_LIST_HEAD(&id_priv->mc_list);
402 get_random_bytes(&id_priv->seq_num, sizeof id_priv->seq_num);
403
404 return &id_priv->id;
405 }
406 EXPORT_SYMBOL(rdma_create_id);
407
408 static int cma_init_ud_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
409 {
410 struct ib_qp_attr qp_attr;
411 int qp_attr_mask, ret;
412
413 qp_attr.qp_state = IB_QPS_INIT;
414 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
415 if (ret)
416 return ret;
417
418 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
419 if (ret)
420 return ret;
421
422 qp_attr.qp_state = IB_QPS_RTR;
423 ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE);
424 if (ret)
425 return ret;
426
427 qp_attr.qp_state = IB_QPS_RTS;
428 qp_attr.sq_psn = 0;
429 ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE | IB_QP_SQ_PSN);
430
431 return ret;
432 }
433
434 static int cma_init_conn_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
435 {
436 struct ib_qp_attr qp_attr;
437 int qp_attr_mask, ret;
438
439 qp_attr.qp_state = IB_QPS_INIT;
440 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
441 if (ret)
442 return ret;
443
444 return ib_modify_qp(qp, &qp_attr, qp_attr_mask);
445 }
446
447 int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd,
448 struct ib_qp_init_attr *qp_init_attr)
449 {
450 struct rdma_id_private *id_priv;
451 struct ib_qp *qp;
452 int ret;
453
454 id_priv = container_of(id, struct rdma_id_private, id);
455 if (id->device != pd->device)
456 return -EINVAL;
457
458 qp = ib_create_qp(pd, qp_init_attr);
459 if (IS_ERR(qp))
460 return PTR_ERR(qp);
461
462 if (cma_is_ud_ps(id_priv->id.ps))
463 ret = cma_init_ud_qp(id_priv, qp);
464 else
465 ret = cma_init_conn_qp(id_priv, qp);
466 if (ret)
467 goto err;
468
469 id->qp = qp;
470 id_priv->qp_num = qp->qp_num;
471 id_priv->srq = (qp->srq != NULL);
472 return 0;
473 err:
474 ib_destroy_qp(qp);
475 return ret;
476 }
477 EXPORT_SYMBOL(rdma_create_qp);
478
479 void rdma_destroy_qp(struct rdma_cm_id *id)
480 {
481 struct rdma_id_private *id_priv;
482
483 id_priv = container_of(id, struct rdma_id_private, id);
484 mutex_lock(&id_priv->qp_mutex);
485 ib_destroy_qp(id_priv->id.qp);
486 id_priv->id.qp = NULL;
487 mutex_unlock(&id_priv->qp_mutex);
488 }
489 EXPORT_SYMBOL(rdma_destroy_qp);
490
491 static int cma_modify_qp_rtr(struct rdma_id_private *id_priv)
492 {
493 struct ib_qp_attr qp_attr;
494 int qp_attr_mask, ret;
495
496 mutex_lock(&id_priv->qp_mutex);
497 if (!id_priv->id.qp) {
498 ret = 0;
499 goto out;
500 }
501
502 /* Need to update QP attributes from default values. */
503 qp_attr.qp_state = IB_QPS_INIT;
504 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
505 if (ret)
506 goto out;
507
508 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
509 if (ret)
510 goto out;
511
512 qp_attr.qp_state = IB_QPS_RTR;
513 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
514 if (ret)
515 goto out;
516
517 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
518 out:
519 mutex_unlock(&id_priv->qp_mutex);
520 return ret;
521 }
522
523 static int cma_modify_qp_rts(struct rdma_id_private *id_priv)
524 {
525 struct ib_qp_attr qp_attr;
526 int qp_attr_mask, ret;
527
528 mutex_lock(&id_priv->qp_mutex);
529 if (!id_priv->id.qp) {
530 ret = 0;
531 goto out;
532 }
533
534 qp_attr.qp_state = IB_QPS_RTS;
535 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
536 if (ret)
537 goto out;
538
539 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
540 out:
541 mutex_unlock(&id_priv->qp_mutex);
542 return ret;
543 }
544
545 static int cma_modify_qp_err(struct rdma_id_private *id_priv)
546 {
547 struct ib_qp_attr qp_attr;
548 int ret;
549
550 mutex_lock(&id_priv->qp_mutex);
551 if (!id_priv->id.qp) {
552 ret = 0;
553 goto out;
554 }
555
556 qp_attr.qp_state = IB_QPS_ERR;
557 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, IB_QP_STATE);
558 out:
559 mutex_unlock(&id_priv->qp_mutex);
560 return ret;
561 }
562
563 static int cma_ib_init_qp_attr(struct rdma_id_private *id_priv,
564 struct ib_qp_attr *qp_attr, int *qp_attr_mask)
565 {
566 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
567 int ret;
568
569 ret = ib_find_cached_pkey(id_priv->id.device, id_priv->id.port_num,
570 ib_addr_get_pkey(dev_addr),
571 &qp_attr->pkey_index);
572 if (ret)
573 return ret;
574
575 qp_attr->port_num = id_priv->id.port_num;
576 *qp_attr_mask = IB_QP_STATE | IB_QP_PKEY_INDEX | IB_QP_PORT;
577
578 if (cma_is_ud_ps(id_priv->id.ps)) {
579 qp_attr->qkey = id_priv->qkey;
580 *qp_attr_mask |= IB_QP_QKEY;
581 } else {
582 qp_attr->qp_access_flags = 0;
583 *qp_attr_mask |= IB_QP_ACCESS_FLAGS;
584 }
585 return 0;
586 }
587
588 int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
589 int *qp_attr_mask)
590 {
591 struct rdma_id_private *id_priv;
592 int ret = 0;
593
594 id_priv = container_of(id, struct rdma_id_private, id);
595 switch (rdma_node_get_transport(id_priv->id.device->node_type)) {
596 case RDMA_TRANSPORT_IB:
597 if (!id_priv->cm_id.ib || cma_is_ud_ps(id_priv->id.ps))
598 ret = cma_ib_init_qp_attr(id_priv, qp_attr, qp_attr_mask);
599 else
600 ret = ib_cm_init_qp_attr(id_priv->cm_id.ib, qp_attr,
601 qp_attr_mask);
602 if (qp_attr->qp_state == IB_QPS_RTR)
603 qp_attr->rq_psn = id_priv->seq_num;
604 break;
605 case RDMA_TRANSPORT_IWARP:
606 if (!id_priv->cm_id.iw) {
607 qp_attr->qp_access_flags = 0;
608 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS;
609 } else
610 ret = iw_cm_init_qp_attr(id_priv->cm_id.iw, qp_attr,
611 qp_attr_mask);
612 break;
613 default:
614 ret = -ENOSYS;
615 break;
616 }
617
618 return ret;
619 }
620 EXPORT_SYMBOL(rdma_init_qp_attr);
621
622 static inline int cma_zero_addr(struct sockaddr *addr)
623 {
624 struct in6_addr *ip6;
625
626 if (addr->sa_family == AF_INET)
627 return ZERONET(((struct sockaddr_in *) addr)->sin_addr.s_addr);
628 else {
629 ip6 = &((struct sockaddr_in6 *) addr)->sin6_addr;
630 return (ip6->s6_addr32[0] | ip6->s6_addr32[1] |
631 ip6->s6_addr32[2] | ip6->s6_addr32[3]) == 0;
632 }
633 }
634
635 static inline int cma_loopback_addr(struct sockaddr *addr)
636 {
637 return LOOPBACK(((struct sockaddr_in *) addr)->sin_addr.s_addr);
638 }
639
640 static inline int cma_any_addr(struct sockaddr *addr)
641 {
642 return cma_zero_addr(addr) || cma_loopback_addr(addr);
643 }
644
645 static inline __be16 cma_port(struct sockaddr *addr)
646 {
647 if (addr->sa_family == AF_INET)
648 return ((struct sockaddr_in *) addr)->sin_port;
649 else
650 return ((struct sockaddr_in6 *) addr)->sin6_port;
651 }
652
653 static inline int cma_any_port(struct sockaddr *addr)
654 {
655 return !cma_port(addr);
656 }
657
658 static int cma_get_net_info(void *hdr, enum rdma_port_space ps,
659 u8 *ip_ver, __u16 *port,
660 union cma_ip_addr **src, union cma_ip_addr **dst)
661 {
662 switch (ps) {
663 case RDMA_PS_SDP:
664 if (sdp_get_majv(((struct sdp_hh *) hdr)->sdp_version) !=
665 SDP_MAJ_VERSION)
666 return -EINVAL;
667
668 *ip_ver = sdp_get_ip_ver(hdr);
669 *port = ((struct sdp_hh *) hdr)->port;
670 *src = &((struct sdp_hh *) hdr)->src_addr;
671 *dst = &((struct sdp_hh *) hdr)->dst_addr;
672 break;
673 default:
674 if (((struct cma_hdr *) hdr)->cma_version != CMA_VERSION)
675 return -EINVAL;
676
677 *ip_ver = cma_get_ip_ver(hdr);
678 *port = ((struct cma_hdr *) hdr)->port;
679 *src = &((struct cma_hdr *) hdr)->src_addr;
680 *dst = &((struct cma_hdr *) hdr)->dst_addr;
681 break;
682 }
683
684 if (*ip_ver != 4 && *ip_ver != 6)
685 return -EINVAL;
686 return 0;
687 }
688
689 static void cma_save_net_info(struct rdma_addr *addr,
690 struct rdma_addr *listen_addr,
691 u8 ip_ver, __u16 port,
692 union cma_ip_addr *src, union cma_ip_addr *dst)
693 {
694 struct sockaddr_in *listen4, *ip4;
695 struct sockaddr_in6 *listen6, *ip6;
696
697 switch (ip_ver) {
698 case 4:
699 listen4 = (struct sockaddr_in *) &listen_addr->src_addr;
700 ip4 = (struct sockaddr_in *) &addr->src_addr;
701 ip4->sin_family = listen4->sin_family;
702 ip4->sin_addr.s_addr = dst->ip4.addr;
703 ip4->sin_port = listen4->sin_port;
704
705 ip4 = (struct sockaddr_in *) &addr->dst_addr;
706 ip4->sin_family = listen4->sin_family;
707 ip4->sin_addr.s_addr = src->ip4.addr;
708 ip4->sin_port = port;
709 break;
710 case 6:
711 listen6 = (struct sockaddr_in6 *) &listen_addr->src_addr;
712 ip6 = (struct sockaddr_in6 *) &addr->src_addr;
713 ip6->sin6_family = listen6->sin6_family;
714 ip6->sin6_addr = dst->ip6;
715 ip6->sin6_port = listen6->sin6_port;
716
717 ip6 = (struct sockaddr_in6 *) &addr->dst_addr;
718 ip6->sin6_family = listen6->sin6_family;
719 ip6->sin6_addr = src->ip6;
720 ip6->sin6_port = port;
721 break;
722 default:
723 break;
724 }
725 }
726
727 static inline int cma_user_data_offset(enum rdma_port_space ps)
728 {
729 switch (ps) {
730 case RDMA_PS_SDP:
731 return 0;
732 default:
733 return sizeof(struct cma_hdr);
734 }
735 }
736
737 static void cma_cancel_route(struct rdma_id_private *id_priv)
738 {
739 switch (rdma_node_get_transport(id_priv->id.device->node_type)) {
740 case RDMA_TRANSPORT_IB:
741 if (id_priv->query)
742 ib_sa_cancel_query(id_priv->query_id, id_priv->query);
743 break;
744 default:
745 break;
746 }
747 }
748
749 static void cma_cancel_listens(struct rdma_id_private *id_priv)
750 {
751 struct rdma_id_private *dev_id_priv;
752
753 /*
754 * Remove from listen_any_list to prevent added devices from spawning
755 * additional listen requests.
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 /* sync with device removal to avoid duplicate destruction */
764 list_del_init(&dev_id_priv->list);
765 list_del(&dev_id_priv->listen_list);
766 mutex_unlock(&lock);
767
768 rdma_destroy_id(&dev_id_priv->id);
769 mutex_lock(&lock);
770 }
771 mutex_unlock(&lock);
772 }
773
774 static void cma_cancel_operation(struct rdma_id_private *id_priv,
775 enum cma_state state)
776 {
777 switch (state) {
778 case CMA_ADDR_QUERY:
779 rdma_addr_cancel(&id_priv->id.route.addr.dev_addr);
780 break;
781 case CMA_ROUTE_QUERY:
782 cma_cancel_route(id_priv);
783 break;
784 case CMA_LISTEN:
785 if (cma_any_addr(&id_priv->id.route.addr.src_addr) &&
786 !id_priv->cma_dev)
787 cma_cancel_listens(id_priv);
788 break;
789 default:
790 break;
791 }
792 }
793
794 static void cma_release_port(struct rdma_id_private *id_priv)
795 {
796 struct rdma_bind_list *bind_list = id_priv->bind_list;
797
798 if (!bind_list)
799 return;
800
801 mutex_lock(&lock);
802 hlist_del(&id_priv->node);
803 if (hlist_empty(&bind_list->owners)) {
804 idr_remove(bind_list->ps, bind_list->port);
805 kfree(bind_list);
806 }
807 mutex_unlock(&lock);
808 }
809
810 static void cma_leave_mc_groups(struct rdma_id_private *id_priv)
811 {
812 struct cma_multicast *mc;
813
814 while (!list_empty(&id_priv->mc_list)) {
815 mc = container_of(id_priv->mc_list.next,
816 struct cma_multicast, list);
817 list_del(&mc->list);
818 ib_sa_free_multicast(mc->multicast.ib);
819 kfree(mc);
820 }
821 }
822
823 void rdma_destroy_id(struct rdma_cm_id *id)
824 {
825 struct rdma_id_private *id_priv;
826 enum cma_state state;
827
828 id_priv = container_of(id, struct rdma_id_private, id);
829 state = cma_exch(id_priv, CMA_DESTROYING);
830 cma_cancel_operation(id_priv, state);
831
832 mutex_lock(&lock);
833 if (id_priv->cma_dev) {
834 mutex_unlock(&lock);
835 switch (rdma_node_get_transport(id->device->node_type)) {
836 case RDMA_TRANSPORT_IB:
837 if (id_priv->cm_id.ib && !IS_ERR(id_priv->cm_id.ib))
838 ib_destroy_cm_id(id_priv->cm_id.ib);
839 break;
840 case RDMA_TRANSPORT_IWARP:
841 if (id_priv->cm_id.iw && !IS_ERR(id_priv->cm_id.iw))
842 iw_destroy_cm_id(id_priv->cm_id.iw);
843 break;
844 default:
845 break;
846 }
847 cma_leave_mc_groups(id_priv);
848 mutex_lock(&lock);
849 cma_detach_from_dev(id_priv);
850 }
851 mutex_unlock(&lock);
852
853 cma_release_port(id_priv);
854 cma_deref_id(id_priv);
855 wait_for_completion(&id_priv->comp);
856
857 if (id_priv->internal_id)
858 cma_deref_id(id_priv->id.context);
859
860 kfree(id_priv->id.route.path_rec);
861 kfree(id_priv);
862 }
863 EXPORT_SYMBOL(rdma_destroy_id);
864
865 static int cma_rep_recv(struct rdma_id_private *id_priv)
866 {
867 int ret;
868
869 ret = cma_modify_qp_rtr(id_priv);
870 if (ret)
871 goto reject;
872
873 ret = cma_modify_qp_rts(id_priv);
874 if (ret)
875 goto reject;
876
877 ret = ib_send_cm_rtu(id_priv->cm_id.ib, NULL, 0);
878 if (ret)
879 goto reject;
880
881 return 0;
882 reject:
883 cma_modify_qp_err(id_priv);
884 ib_send_cm_rej(id_priv->cm_id.ib, IB_CM_REJ_CONSUMER_DEFINED,
885 NULL, 0, NULL, 0);
886 return ret;
887 }
888
889 static int cma_verify_rep(struct rdma_id_private *id_priv, void *data)
890 {
891 if (id_priv->id.ps == RDMA_PS_SDP &&
892 sdp_get_majv(((struct sdp_hah *) data)->sdp_version) !=
893 SDP_MAJ_VERSION)
894 return -EINVAL;
895
896 return 0;
897 }
898
899 static void cma_set_rep_event_data(struct rdma_cm_event *event,
900 struct ib_cm_rep_event_param *rep_data,
901 void *private_data)
902 {
903 event->param.conn.private_data = private_data;
904 event->param.conn.private_data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
905 event->param.conn.responder_resources = rep_data->responder_resources;
906 event->param.conn.initiator_depth = rep_data->initiator_depth;
907 event->param.conn.flow_control = rep_data->flow_control;
908 event->param.conn.rnr_retry_count = rep_data->rnr_retry_count;
909 event->param.conn.srq = rep_data->srq;
910 event->param.conn.qp_num = rep_data->remote_qpn;
911 }
912
913 static int cma_ib_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
914 {
915 struct rdma_id_private *id_priv = cm_id->context;
916 struct rdma_cm_event event;
917 int ret = 0;
918
919 if (cma_disable_remove(id_priv, CMA_CONNECT))
920 return 0;
921
922 memset(&event, 0, sizeof event);
923 switch (ib_event->event) {
924 case IB_CM_REQ_ERROR:
925 case IB_CM_REP_ERROR:
926 event.event = RDMA_CM_EVENT_UNREACHABLE;
927 event.status = -ETIMEDOUT;
928 break;
929 case IB_CM_REP_RECEIVED:
930 event.status = cma_verify_rep(id_priv, ib_event->private_data);
931 if (event.status)
932 event.event = RDMA_CM_EVENT_CONNECT_ERROR;
933 else if (id_priv->id.qp && id_priv->id.ps != RDMA_PS_SDP) {
934 event.status = cma_rep_recv(id_priv);
935 event.event = event.status ? RDMA_CM_EVENT_CONNECT_ERROR :
936 RDMA_CM_EVENT_ESTABLISHED;
937 } else
938 event.event = RDMA_CM_EVENT_CONNECT_RESPONSE;
939 cma_set_rep_event_data(&event, &ib_event->param.rep_rcvd,
940 ib_event->private_data);
941 break;
942 case IB_CM_RTU_RECEIVED:
943 case IB_CM_USER_ESTABLISHED:
944 event.event = RDMA_CM_EVENT_ESTABLISHED;
945 break;
946 case IB_CM_DREQ_ERROR:
947 event.status = -ETIMEDOUT; /* fall through */
948 case IB_CM_DREQ_RECEIVED:
949 case IB_CM_DREP_RECEIVED:
950 if (!cma_comp_exch(id_priv, CMA_CONNECT, CMA_DISCONNECT))
951 goto out;
952 event.event = RDMA_CM_EVENT_DISCONNECTED;
953 break;
954 case IB_CM_TIMEWAIT_EXIT:
955 case IB_CM_MRA_RECEIVED:
956 /* ignore event */
957 goto out;
958 case IB_CM_REJ_RECEIVED:
959 cma_modify_qp_err(id_priv);
960 event.status = ib_event->param.rej_rcvd.reason;
961 event.event = RDMA_CM_EVENT_REJECTED;
962 event.param.conn.private_data = ib_event->private_data;
963 event.param.conn.private_data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
964 break;
965 default:
966 printk(KERN_ERR "RDMA CMA: unexpected IB CM event: %d",
967 ib_event->event);
968 goto out;
969 }
970
971 ret = id_priv->id.event_handler(&id_priv->id, &event);
972 if (ret) {
973 /* Destroy the CM ID by returning a non-zero value. */
974 id_priv->cm_id.ib = NULL;
975 cma_exch(id_priv, CMA_DESTROYING);
976 cma_enable_remove(id_priv);
977 rdma_destroy_id(&id_priv->id);
978 return ret;
979 }
980 out:
981 cma_enable_remove(id_priv);
982 return ret;
983 }
984
985 static struct rdma_id_private *cma_new_conn_id(struct rdma_cm_id *listen_id,
986 struct ib_cm_event *ib_event)
987 {
988 struct rdma_id_private *id_priv;
989 struct rdma_cm_id *id;
990 struct rdma_route *rt;
991 union cma_ip_addr *src, *dst;
992 __u16 port;
993 u8 ip_ver;
994
995 if (cma_get_net_info(ib_event->private_data, listen_id->ps,
996 &ip_ver, &port, &src, &dst))
997 goto err;
998
999 id = rdma_create_id(listen_id->event_handler, listen_id->context,
1000 listen_id->ps);
1001 if (IS_ERR(id))
1002 goto err;
1003
1004 cma_save_net_info(&id->route.addr, &listen_id->route.addr,
1005 ip_ver, port, src, dst);
1006
1007 rt = &id->route;
1008 rt->num_paths = ib_event->param.req_rcvd.alternate_path ? 2 : 1;
1009 rt->path_rec = kmalloc(sizeof *rt->path_rec * rt->num_paths,
1010 GFP_KERNEL);
1011 if (!rt->path_rec)
1012 goto destroy_id;
1013
1014 rt->path_rec[0] = *ib_event->param.req_rcvd.primary_path;
1015 if (rt->num_paths == 2)
1016 rt->path_rec[1] = *ib_event->param.req_rcvd.alternate_path;
1017
1018 ib_addr_set_sgid(&rt->addr.dev_addr, &rt->path_rec[0].sgid);
1019 ib_addr_set_dgid(&rt->addr.dev_addr, &rt->path_rec[0].dgid);
1020 ib_addr_set_pkey(&rt->addr.dev_addr, be16_to_cpu(rt->path_rec[0].pkey));
1021 rt->addr.dev_addr.dev_type = RDMA_NODE_IB_CA;
1022
1023 id_priv = container_of(id, struct rdma_id_private, id);
1024 id_priv->state = CMA_CONNECT;
1025 return id_priv;
1026
1027 destroy_id:
1028 rdma_destroy_id(id);
1029 err:
1030 return NULL;
1031 }
1032
1033 static struct rdma_id_private *cma_new_udp_id(struct rdma_cm_id *listen_id,
1034 struct ib_cm_event *ib_event)
1035 {
1036 struct rdma_id_private *id_priv;
1037 struct rdma_cm_id *id;
1038 union cma_ip_addr *src, *dst;
1039 __u16 port;
1040 u8 ip_ver;
1041 int ret;
1042
1043 id = rdma_create_id(listen_id->event_handler, listen_id->context,
1044 listen_id->ps);
1045 if (IS_ERR(id))
1046 return NULL;
1047
1048
1049 if (cma_get_net_info(ib_event->private_data, listen_id->ps,
1050 &ip_ver, &port, &src, &dst))
1051 goto err;
1052
1053 cma_save_net_info(&id->route.addr, &listen_id->route.addr,
1054 ip_ver, port, src, dst);
1055
1056 ret = rdma_translate_ip(&id->route.addr.src_addr,
1057 &id->route.addr.dev_addr);
1058 if (ret)
1059 goto err;
1060
1061 id_priv = container_of(id, struct rdma_id_private, id);
1062 id_priv->state = CMA_CONNECT;
1063 return id_priv;
1064 err:
1065 rdma_destroy_id(id);
1066 return NULL;
1067 }
1068
1069 static void cma_set_req_event_data(struct rdma_cm_event *event,
1070 struct ib_cm_req_event_param *req_data,
1071 void *private_data, int offset)
1072 {
1073 event->param.conn.private_data = private_data + offset;
1074 event->param.conn.private_data_len = IB_CM_REQ_PRIVATE_DATA_SIZE - offset;
1075 event->param.conn.responder_resources = req_data->responder_resources;
1076 event->param.conn.initiator_depth = req_data->initiator_depth;
1077 event->param.conn.flow_control = req_data->flow_control;
1078 event->param.conn.retry_count = req_data->retry_count;
1079 event->param.conn.rnr_retry_count = req_data->rnr_retry_count;
1080 event->param.conn.srq = req_data->srq;
1081 event->param.conn.qp_num = req_data->remote_qpn;
1082 }
1083
1084 static int cma_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
1085 {
1086 struct rdma_id_private *listen_id, *conn_id;
1087 struct rdma_cm_event event;
1088 int offset, ret;
1089
1090 listen_id = cm_id->context;
1091 if (cma_disable_remove(listen_id, CMA_LISTEN))
1092 return -ECONNABORTED;
1093
1094 memset(&event, 0, sizeof event);
1095 offset = cma_user_data_offset(listen_id->id.ps);
1096 event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
1097 if (cma_is_ud_ps(listen_id->id.ps)) {
1098 conn_id = cma_new_udp_id(&listen_id->id, ib_event);
1099 event.param.ud.private_data = ib_event->private_data + offset;
1100 event.param.ud.private_data_len =
1101 IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE - offset;
1102 } else {
1103 ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0);
1104 conn_id = cma_new_conn_id(&listen_id->id, ib_event);
1105 cma_set_req_event_data(&event, &ib_event->param.req_rcvd,
1106 ib_event->private_data, offset);
1107 }
1108 if (!conn_id) {
1109 ret = -ENOMEM;
1110 goto out;
1111 }
1112
1113 atomic_inc(&conn_id->dev_remove);
1114 mutex_lock(&lock);
1115 ret = cma_acquire_dev(conn_id);
1116 mutex_unlock(&lock);
1117 if (ret)
1118 goto release_conn_id;
1119
1120 conn_id->cm_id.ib = cm_id;
1121 cm_id->context = conn_id;
1122 cm_id->cm_handler = cma_ib_handler;
1123
1124 ret = conn_id->id.event_handler(&conn_id->id, &event);
1125 if (!ret)
1126 goto out;
1127
1128 /* Destroy the CM ID by returning a non-zero value. */
1129 conn_id->cm_id.ib = NULL;
1130
1131 release_conn_id:
1132 cma_exch(conn_id, CMA_DESTROYING);
1133 cma_enable_remove(conn_id);
1134 rdma_destroy_id(&conn_id->id);
1135
1136 out:
1137 cma_enable_remove(listen_id);
1138 return ret;
1139 }
1140
1141 static __be64 cma_get_service_id(enum rdma_port_space ps, struct sockaddr *addr)
1142 {
1143 return cpu_to_be64(((u64)ps << 16) + be16_to_cpu(cma_port(addr)));
1144 }
1145
1146 static void cma_set_compare_data(enum rdma_port_space ps, struct sockaddr *addr,
1147 struct ib_cm_compare_data *compare)
1148 {
1149 struct cma_hdr *cma_data, *cma_mask;
1150 struct sdp_hh *sdp_data, *sdp_mask;
1151 __u32 ip4_addr;
1152 struct in6_addr ip6_addr;
1153
1154 memset(compare, 0, sizeof *compare);
1155 cma_data = (void *) compare->data;
1156 cma_mask = (void *) compare->mask;
1157 sdp_data = (void *) compare->data;
1158 sdp_mask = (void *) compare->mask;
1159
1160 switch (addr->sa_family) {
1161 case AF_INET:
1162 ip4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
1163 if (ps == RDMA_PS_SDP) {
1164 sdp_set_ip_ver(sdp_data, 4);
1165 sdp_set_ip_ver(sdp_mask, 0xF);
1166 sdp_data->dst_addr.ip4.addr = ip4_addr;
1167 sdp_mask->dst_addr.ip4.addr = ~0;
1168 } else {
1169 cma_set_ip_ver(cma_data, 4);
1170 cma_set_ip_ver(cma_mask, 0xF);
1171 cma_data->dst_addr.ip4.addr = ip4_addr;
1172 cma_mask->dst_addr.ip4.addr = ~0;
1173 }
1174 break;
1175 case AF_INET6:
1176 ip6_addr = ((struct sockaddr_in6 *) addr)->sin6_addr;
1177 if (ps == RDMA_PS_SDP) {
1178 sdp_set_ip_ver(sdp_data, 6);
1179 sdp_set_ip_ver(sdp_mask, 0xF);
1180 sdp_data->dst_addr.ip6 = ip6_addr;
1181 memset(&sdp_mask->dst_addr.ip6, 0xFF,
1182 sizeof sdp_mask->dst_addr.ip6);
1183 } else {
1184 cma_set_ip_ver(cma_data, 6);
1185 cma_set_ip_ver(cma_mask, 0xF);
1186 cma_data->dst_addr.ip6 = ip6_addr;
1187 memset(&cma_mask->dst_addr.ip6, 0xFF,
1188 sizeof cma_mask->dst_addr.ip6);
1189 }
1190 break;
1191 default:
1192 break;
1193 }
1194 }
1195
1196 static int cma_iw_handler(struct iw_cm_id *iw_id, struct iw_cm_event *iw_event)
1197 {
1198 struct rdma_id_private *id_priv = iw_id->context;
1199 struct rdma_cm_event event;
1200 struct sockaddr_in *sin;
1201 int ret = 0;
1202
1203 if (cma_disable_remove(id_priv, CMA_CONNECT))
1204 return 0;
1205
1206 memset(&event, 0, sizeof event);
1207 switch (iw_event->event) {
1208 case IW_CM_EVENT_CLOSE:
1209 event.event = RDMA_CM_EVENT_DISCONNECTED;
1210 break;
1211 case IW_CM_EVENT_CONNECT_REPLY:
1212 sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
1213 *sin = iw_event->local_addr;
1214 sin = (struct sockaddr_in *) &id_priv->id.route.addr.dst_addr;
1215 *sin = iw_event->remote_addr;
1216 switch (iw_event->status) {
1217 case 0:
1218 event.event = RDMA_CM_EVENT_ESTABLISHED;
1219 break;
1220 case -ECONNRESET:
1221 case -ECONNREFUSED:
1222 event.event = RDMA_CM_EVENT_REJECTED;
1223 break;
1224 case -ETIMEDOUT:
1225 event.event = RDMA_CM_EVENT_UNREACHABLE;
1226 break;
1227 default:
1228 event.event = RDMA_CM_EVENT_CONNECT_ERROR;
1229 break;
1230 }
1231 break;
1232 case IW_CM_EVENT_ESTABLISHED:
1233 event.event = RDMA_CM_EVENT_ESTABLISHED;
1234 break;
1235 default:
1236 BUG_ON(1);
1237 }
1238
1239 event.status = iw_event->status;
1240 event.param.conn.private_data = iw_event->private_data;
1241 event.param.conn.private_data_len = iw_event->private_data_len;
1242 ret = id_priv->id.event_handler(&id_priv->id, &event);
1243 if (ret) {
1244 /* Destroy the CM ID by returning a non-zero value. */
1245 id_priv->cm_id.iw = NULL;
1246 cma_exch(id_priv, CMA_DESTROYING);
1247 cma_enable_remove(id_priv);
1248 rdma_destroy_id(&id_priv->id);
1249 return ret;
1250 }
1251
1252 cma_enable_remove(id_priv);
1253 return ret;
1254 }
1255
1256 static int iw_conn_req_handler(struct iw_cm_id *cm_id,
1257 struct iw_cm_event *iw_event)
1258 {
1259 struct rdma_cm_id *new_cm_id;
1260 struct rdma_id_private *listen_id, *conn_id;
1261 struct sockaddr_in *sin;
1262 struct net_device *dev = NULL;
1263 struct rdma_cm_event event;
1264 int ret;
1265
1266 listen_id = cm_id->context;
1267 if (cma_disable_remove(listen_id, CMA_LISTEN))
1268 return -ECONNABORTED;
1269
1270 /* Create a new RDMA id for the new IW CM ID */
1271 new_cm_id = rdma_create_id(listen_id->id.event_handler,
1272 listen_id->id.context,
1273 RDMA_PS_TCP);
1274 if (!new_cm_id) {
1275 ret = -ENOMEM;
1276 goto out;
1277 }
1278 conn_id = container_of(new_cm_id, struct rdma_id_private, id);
1279 atomic_inc(&conn_id->dev_remove);
1280 conn_id->state = CMA_CONNECT;
1281
1282 dev = ip_dev_find(iw_event->local_addr.sin_addr.s_addr);
1283 if (!dev) {
1284 ret = -EADDRNOTAVAIL;
1285 cma_enable_remove(conn_id);
1286 rdma_destroy_id(new_cm_id);
1287 goto out;
1288 }
1289 ret = rdma_copy_addr(&conn_id->id.route.addr.dev_addr, dev, NULL);
1290 if (ret) {
1291 cma_enable_remove(conn_id);
1292 rdma_destroy_id(new_cm_id);
1293 goto out;
1294 }
1295
1296 mutex_lock(&lock);
1297 ret = cma_acquire_dev(conn_id);
1298 mutex_unlock(&lock);
1299 if (ret) {
1300 cma_enable_remove(conn_id);
1301 rdma_destroy_id(new_cm_id);
1302 goto out;
1303 }
1304
1305 conn_id->cm_id.iw = cm_id;
1306 cm_id->context = conn_id;
1307 cm_id->cm_handler = cma_iw_handler;
1308
1309 sin = (struct sockaddr_in *) &new_cm_id->route.addr.src_addr;
1310 *sin = iw_event->local_addr;
1311 sin = (struct sockaddr_in *) &new_cm_id->route.addr.dst_addr;
1312 *sin = iw_event->remote_addr;
1313
1314 memset(&event, 0, sizeof event);
1315 event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
1316 event.param.conn.private_data = iw_event->private_data;
1317 event.param.conn.private_data_len = iw_event->private_data_len;
1318 ret = conn_id->id.event_handler(&conn_id->id, &event);
1319 if (ret) {
1320 /* User wants to destroy the CM ID */
1321 conn_id->cm_id.iw = NULL;
1322 cma_exch(conn_id, CMA_DESTROYING);
1323 cma_enable_remove(conn_id);
1324 rdma_destroy_id(&conn_id->id);
1325 }
1326
1327 out:
1328 if (dev)
1329 dev_put(dev);
1330 cma_enable_remove(listen_id);
1331 return ret;
1332 }
1333
1334 static int cma_ib_listen(struct rdma_id_private *id_priv)
1335 {
1336 struct ib_cm_compare_data compare_data;
1337 struct sockaddr *addr;
1338 __be64 svc_id;
1339 int ret;
1340
1341 id_priv->cm_id.ib = ib_create_cm_id(id_priv->id.device, cma_req_handler,
1342 id_priv);
1343 if (IS_ERR(id_priv->cm_id.ib))
1344 return PTR_ERR(id_priv->cm_id.ib);
1345
1346 addr = &id_priv->id.route.addr.src_addr;
1347 svc_id = cma_get_service_id(id_priv->id.ps, addr);
1348 if (cma_any_addr(addr))
1349 ret = ib_cm_listen(id_priv->cm_id.ib, svc_id, 0, NULL);
1350 else {
1351 cma_set_compare_data(id_priv->id.ps, addr, &compare_data);
1352 ret = ib_cm_listen(id_priv->cm_id.ib, svc_id, 0, &compare_data);
1353 }
1354
1355 if (ret) {
1356 ib_destroy_cm_id(id_priv->cm_id.ib);
1357 id_priv->cm_id.ib = NULL;
1358 }
1359
1360 return ret;
1361 }
1362
1363 static int cma_iw_listen(struct rdma_id_private *id_priv, int backlog)
1364 {
1365 int ret;
1366 struct sockaddr_in *sin;
1367
1368 id_priv->cm_id.iw = iw_create_cm_id(id_priv->id.device,
1369 iw_conn_req_handler,
1370 id_priv);
1371 if (IS_ERR(id_priv->cm_id.iw))
1372 return PTR_ERR(id_priv->cm_id.iw);
1373
1374 sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
1375 id_priv->cm_id.iw->local_addr = *sin;
1376
1377 ret = iw_cm_listen(id_priv->cm_id.iw, backlog);
1378
1379 if (ret) {
1380 iw_destroy_cm_id(id_priv->cm_id.iw);
1381 id_priv->cm_id.iw = NULL;
1382 }
1383
1384 return ret;
1385 }
1386
1387 static int cma_listen_handler(struct rdma_cm_id *id,
1388 struct rdma_cm_event *event)
1389 {
1390 struct rdma_id_private *id_priv = id->context;
1391
1392 id->context = id_priv->id.context;
1393 id->event_handler = id_priv->id.event_handler;
1394 return id_priv->id.event_handler(id, event);
1395 }
1396
1397 static void cma_listen_on_dev(struct rdma_id_private *id_priv,
1398 struct cma_device *cma_dev)
1399 {
1400 struct rdma_id_private *dev_id_priv;
1401 struct rdma_cm_id *id;
1402 int ret;
1403
1404 id = rdma_create_id(cma_listen_handler, id_priv, id_priv->id.ps);
1405 if (IS_ERR(id))
1406 return;
1407
1408 dev_id_priv = container_of(id, struct rdma_id_private, id);
1409
1410 dev_id_priv->state = CMA_ADDR_BOUND;
1411 memcpy(&id->route.addr.src_addr, &id_priv->id.route.addr.src_addr,
1412 ip_addr_size(&id_priv->id.route.addr.src_addr));
1413
1414 cma_attach_to_dev(dev_id_priv, cma_dev);
1415 list_add_tail(&dev_id_priv->listen_list, &id_priv->listen_list);
1416 atomic_inc(&id_priv->refcount);
1417 dev_id_priv->internal_id = 1;
1418
1419 ret = rdma_listen(id, id_priv->backlog);
1420 if (ret)
1421 printk(KERN_WARNING "RDMA CMA: cma_listen_on_dev, error %d, "
1422 "listening on device %s", ret, cma_dev->device->name);
1423 }
1424
1425 static void cma_listen_on_all(struct rdma_id_private *id_priv)
1426 {
1427 struct cma_device *cma_dev;
1428
1429 mutex_lock(&lock);
1430 list_add_tail(&id_priv->list, &listen_any_list);
1431 list_for_each_entry(cma_dev, &dev_list, list)
1432 cma_listen_on_dev(id_priv, cma_dev);
1433 mutex_unlock(&lock);
1434 }
1435
1436 static int cma_bind_any(struct rdma_cm_id *id, sa_family_t af)
1437 {
1438 struct sockaddr_in addr_in;
1439
1440 memset(&addr_in, 0, sizeof addr_in);
1441 addr_in.sin_family = af;
1442 return rdma_bind_addr(id, (struct sockaddr *) &addr_in);
1443 }
1444
1445 int rdma_listen(struct rdma_cm_id *id, int backlog)
1446 {
1447 struct rdma_id_private *id_priv;
1448 int ret;
1449
1450 id_priv = container_of(id, struct rdma_id_private, id);
1451 if (id_priv->state == CMA_IDLE) {
1452 ret = cma_bind_any(id, AF_INET);
1453 if (ret)
1454 return ret;
1455 }
1456
1457 if (!cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_LISTEN))
1458 return -EINVAL;
1459
1460 id_priv->backlog = backlog;
1461 if (id->device) {
1462 switch (rdma_node_get_transport(id->device->node_type)) {
1463 case RDMA_TRANSPORT_IB:
1464 ret = cma_ib_listen(id_priv);
1465 if (ret)
1466 goto err;
1467 break;
1468 case RDMA_TRANSPORT_IWARP:
1469 ret = cma_iw_listen(id_priv, backlog);
1470 if (ret)
1471 goto err;
1472 break;
1473 default:
1474 ret = -ENOSYS;
1475 goto err;
1476 }
1477 } else
1478 cma_listen_on_all(id_priv);
1479
1480 return 0;
1481 err:
1482 id_priv->backlog = 0;
1483 cma_comp_exch(id_priv, CMA_LISTEN, CMA_ADDR_BOUND);
1484 return ret;
1485 }
1486 EXPORT_SYMBOL(rdma_listen);
1487
1488 void rdma_set_service_type(struct rdma_cm_id *id, int tos)
1489 {
1490 struct rdma_id_private *id_priv;
1491
1492 id_priv = container_of(id, struct rdma_id_private, id);
1493 id_priv->tos = (u8) tos;
1494 }
1495 EXPORT_SYMBOL(rdma_set_service_type);
1496
1497 static void cma_query_handler(int status, struct ib_sa_path_rec *path_rec,
1498 void *context)
1499 {
1500 struct cma_work *work = context;
1501 struct rdma_route *route;
1502
1503 route = &work->id->id.route;
1504
1505 if (!status) {
1506 route->num_paths = 1;
1507 *route->path_rec = *path_rec;
1508 } else {
1509 work->old_state = CMA_ROUTE_QUERY;
1510 work->new_state = CMA_ADDR_RESOLVED;
1511 work->event.event = RDMA_CM_EVENT_ROUTE_ERROR;
1512 work->event.status = status;
1513 }
1514
1515 queue_work(cma_wq, &work->work);
1516 }
1517
1518 static int cma_query_ib_route(struct rdma_id_private *id_priv, int timeout_ms,
1519 struct cma_work *work)
1520 {
1521 struct rdma_addr *addr = &id_priv->id.route.addr;
1522 struct ib_sa_path_rec path_rec;
1523 ib_sa_comp_mask comp_mask;
1524 struct sockaddr_in6 *sin6;
1525
1526 memset(&path_rec, 0, sizeof path_rec);
1527 ib_addr_get_sgid(&addr->dev_addr, &path_rec.sgid);
1528 ib_addr_get_dgid(&addr->dev_addr, &path_rec.dgid);
1529 path_rec.pkey = cpu_to_be16(ib_addr_get_pkey(&addr->dev_addr));
1530 path_rec.numb_path = 1;
1531 path_rec.reversible = 1;
1532 path_rec.service_id = cma_get_service_id(id_priv->id.ps, &addr->dst_addr);
1533
1534 comp_mask = IB_SA_PATH_REC_DGID | IB_SA_PATH_REC_SGID |
1535 IB_SA_PATH_REC_PKEY | IB_SA_PATH_REC_NUMB_PATH |
1536 IB_SA_PATH_REC_REVERSIBLE | IB_SA_PATH_REC_SERVICE_ID;
1537
1538 if (addr->src_addr.sa_family == AF_INET) {
1539 path_rec.qos_class = cpu_to_be16((u16) id_priv->tos);
1540 comp_mask |= IB_SA_PATH_REC_QOS_CLASS;
1541 } else {
1542 sin6 = (struct sockaddr_in6 *) &addr->src_addr;
1543 path_rec.traffic_class = (u8) (be32_to_cpu(sin6->sin6_flowinfo) >> 20);
1544 comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
1545 }
1546
1547 id_priv->query_id = ib_sa_path_rec_get(&sa_client, id_priv->id.device,
1548 id_priv->id.port_num, &path_rec,
1549 comp_mask, timeout_ms,
1550 GFP_KERNEL, cma_query_handler,
1551 work, &id_priv->query);
1552
1553 return (id_priv->query_id < 0) ? id_priv->query_id : 0;
1554 }
1555
1556 static void cma_work_handler(struct work_struct *_work)
1557 {
1558 struct cma_work *work = container_of(_work, struct cma_work, work);
1559 struct rdma_id_private *id_priv = work->id;
1560 int destroy = 0;
1561
1562 atomic_inc(&id_priv->dev_remove);
1563 if (!cma_comp_exch(id_priv, work->old_state, work->new_state))
1564 goto out;
1565
1566 if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
1567 cma_exch(id_priv, CMA_DESTROYING);
1568 destroy = 1;
1569 }
1570 out:
1571 cma_enable_remove(id_priv);
1572 cma_deref_id(id_priv);
1573 if (destroy)
1574 rdma_destroy_id(&id_priv->id);
1575 kfree(work);
1576 }
1577
1578 static int cma_resolve_ib_route(struct rdma_id_private *id_priv, int timeout_ms)
1579 {
1580 struct rdma_route *route = &id_priv->id.route;
1581 struct cma_work *work;
1582 int ret;
1583
1584 work = kzalloc(sizeof *work, GFP_KERNEL);
1585 if (!work)
1586 return -ENOMEM;
1587
1588 work->id = id_priv;
1589 INIT_WORK(&work->work, cma_work_handler);
1590 work->old_state = CMA_ROUTE_QUERY;
1591 work->new_state = CMA_ROUTE_RESOLVED;
1592 work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
1593
1594 route->path_rec = kmalloc(sizeof *route->path_rec, GFP_KERNEL);
1595 if (!route->path_rec) {
1596 ret = -ENOMEM;
1597 goto err1;
1598 }
1599
1600 ret = cma_query_ib_route(id_priv, timeout_ms, work);
1601 if (ret)
1602 goto err2;
1603
1604 return 0;
1605 err2:
1606 kfree(route->path_rec);
1607 route->path_rec = NULL;
1608 err1:
1609 kfree(work);
1610 return ret;
1611 }
1612
1613 int rdma_set_ib_paths(struct rdma_cm_id *id,
1614 struct ib_sa_path_rec *path_rec, int num_paths)
1615 {
1616 struct rdma_id_private *id_priv;
1617 int ret;
1618
1619 id_priv = container_of(id, struct rdma_id_private, id);
1620 if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ROUTE_RESOLVED))
1621 return -EINVAL;
1622
1623 id->route.path_rec = kmalloc(sizeof *path_rec * num_paths, GFP_KERNEL);
1624 if (!id->route.path_rec) {
1625 ret = -ENOMEM;
1626 goto err;
1627 }
1628
1629 memcpy(id->route.path_rec, path_rec, sizeof *path_rec * num_paths);
1630 return 0;
1631 err:
1632 cma_comp_exch(id_priv, CMA_ROUTE_RESOLVED, CMA_ADDR_RESOLVED);
1633 return ret;
1634 }
1635 EXPORT_SYMBOL(rdma_set_ib_paths);
1636
1637 static int cma_resolve_iw_route(struct rdma_id_private *id_priv, int timeout_ms)
1638 {
1639 struct cma_work *work;
1640
1641 work = kzalloc(sizeof *work, GFP_KERNEL);
1642 if (!work)
1643 return -ENOMEM;
1644
1645 work->id = id_priv;
1646 INIT_WORK(&work->work, cma_work_handler);
1647 work->old_state = CMA_ROUTE_QUERY;
1648 work->new_state = CMA_ROUTE_RESOLVED;
1649 work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
1650 queue_work(cma_wq, &work->work);
1651 return 0;
1652 }
1653
1654 int rdma_resolve_route(struct rdma_cm_id *id, int timeout_ms)
1655 {
1656 struct rdma_id_private *id_priv;
1657 int ret;
1658
1659 id_priv = container_of(id, struct rdma_id_private, id);
1660 if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ROUTE_QUERY))
1661 return -EINVAL;
1662
1663 atomic_inc(&id_priv->refcount);
1664 switch (rdma_node_get_transport(id->device->node_type)) {
1665 case RDMA_TRANSPORT_IB:
1666 ret = cma_resolve_ib_route(id_priv, timeout_ms);
1667 break;
1668 case RDMA_TRANSPORT_IWARP:
1669 ret = cma_resolve_iw_route(id_priv, timeout_ms);
1670 break;
1671 default:
1672 ret = -ENOSYS;
1673 break;
1674 }
1675 if (ret)
1676 goto err;
1677
1678 return 0;
1679 err:
1680 cma_comp_exch(id_priv, CMA_ROUTE_QUERY, CMA_ADDR_RESOLVED);
1681 cma_deref_id(id_priv);
1682 return ret;
1683 }
1684 EXPORT_SYMBOL(rdma_resolve_route);
1685
1686 static int cma_bind_loopback(struct rdma_id_private *id_priv)
1687 {
1688 struct cma_device *cma_dev;
1689 struct ib_port_attr port_attr;
1690 union ib_gid gid;
1691 u16 pkey;
1692 int ret;
1693 u8 p;
1694
1695 mutex_lock(&lock);
1696 if (list_empty(&dev_list)) {
1697 ret = -ENODEV;
1698 goto out;
1699 }
1700 list_for_each_entry(cma_dev, &dev_list, list)
1701 for (p = 1; p <= cma_dev->device->phys_port_cnt; ++p)
1702 if (!ib_query_port(cma_dev->device, p, &port_attr) &&
1703 port_attr.state == IB_PORT_ACTIVE)
1704 goto port_found;
1705
1706 p = 1;
1707 cma_dev = list_entry(dev_list.next, struct cma_device, list);
1708
1709 port_found:
1710 ret = ib_get_cached_gid(cma_dev->device, p, 0, &gid);
1711 if (ret)
1712 goto out;
1713
1714 ret = ib_get_cached_pkey(cma_dev->device, p, 0, &pkey);
1715 if (ret)
1716 goto out;
1717
1718 ib_addr_set_sgid(&id_priv->id.route.addr.dev_addr, &gid);
1719 ib_addr_set_pkey(&id_priv->id.route.addr.dev_addr, pkey);
1720 id_priv->id.port_num = p;
1721 cma_attach_to_dev(id_priv, cma_dev);
1722 out:
1723 mutex_unlock(&lock);
1724 return ret;
1725 }
1726
1727 static void addr_handler(int status, struct sockaddr *src_addr,
1728 struct rdma_dev_addr *dev_addr, void *context)
1729 {
1730 struct rdma_id_private *id_priv = context;
1731 struct rdma_cm_event event;
1732
1733 memset(&event, 0, sizeof event);
1734 atomic_inc(&id_priv->dev_remove);
1735
1736 /*
1737 * Grab mutex to block rdma_destroy_id() from removing the device while
1738 * we're trying to acquire it.
1739 */
1740 mutex_lock(&lock);
1741 if (!cma_comp_exch(id_priv, CMA_ADDR_QUERY, CMA_ADDR_RESOLVED)) {
1742 mutex_unlock(&lock);
1743 goto out;
1744 }
1745
1746 if (!status && !id_priv->cma_dev)
1747 status = cma_acquire_dev(id_priv);
1748 mutex_unlock(&lock);
1749
1750 if (status) {
1751 if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ADDR_BOUND))
1752 goto out;
1753 event.event = RDMA_CM_EVENT_ADDR_ERROR;
1754 event.status = status;
1755 } else {
1756 memcpy(&id_priv->id.route.addr.src_addr, src_addr,
1757 ip_addr_size(src_addr));
1758 event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
1759 }
1760
1761 if (id_priv->id.event_handler(&id_priv->id, &event)) {
1762 cma_exch(id_priv, CMA_DESTROYING);
1763 cma_enable_remove(id_priv);
1764 cma_deref_id(id_priv);
1765 rdma_destroy_id(&id_priv->id);
1766 return;
1767 }
1768 out:
1769 cma_enable_remove(id_priv);
1770 cma_deref_id(id_priv);
1771 }
1772
1773 static int cma_resolve_loopback(struct rdma_id_private *id_priv)
1774 {
1775 struct cma_work *work;
1776 struct sockaddr_in *src_in, *dst_in;
1777 union ib_gid gid;
1778 int ret;
1779
1780 work = kzalloc(sizeof *work, GFP_KERNEL);
1781 if (!work)
1782 return -ENOMEM;
1783
1784 if (!id_priv->cma_dev) {
1785 ret = cma_bind_loopback(id_priv);
1786 if (ret)
1787 goto err;
1788 }
1789
1790 ib_addr_get_sgid(&id_priv->id.route.addr.dev_addr, &gid);
1791 ib_addr_set_dgid(&id_priv->id.route.addr.dev_addr, &gid);
1792
1793 if (cma_zero_addr(&id_priv->id.route.addr.src_addr)) {
1794 src_in = (struct sockaddr_in *)&id_priv->id.route.addr.src_addr;
1795 dst_in = (struct sockaddr_in *)&id_priv->id.route.addr.dst_addr;
1796 src_in->sin_family = dst_in->sin_family;
1797 src_in->sin_addr.s_addr = dst_in->sin_addr.s_addr;
1798 }
1799
1800 work->id = id_priv;
1801 INIT_WORK(&work->work, cma_work_handler);
1802 work->old_state = CMA_ADDR_QUERY;
1803 work->new_state = CMA_ADDR_RESOLVED;
1804 work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
1805 queue_work(cma_wq, &work->work);
1806 return 0;
1807 err:
1808 kfree(work);
1809 return ret;
1810 }
1811
1812 static int cma_bind_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
1813 struct sockaddr *dst_addr)
1814 {
1815 if (src_addr && src_addr->sa_family)
1816 return rdma_bind_addr(id, src_addr);
1817 else
1818 return cma_bind_any(id, dst_addr->sa_family);
1819 }
1820
1821 int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
1822 struct sockaddr *dst_addr, int timeout_ms)
1823 {
1824 struct rdma_id_private *id_priv;
1825 int ret;
1826
1827 id_priv = container_of(id, struct rdma_id_private, id);
1828 if (id_priv->state == CMA_IDLE) {
1829 ret = cma_bind_addr(id, src_addr, dst_addr);
1830 if (ret)
1831 return ret;
1832 }
1833
1834 if (!cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_ADDR_QUERY))
1835 return -EINVAL;
1836
1837 atomic_inc(&id_priv->refcount);
1838 memcpy(&id->route.addr.dst_addr, dst_addr, ip_addr_size(dst_addr));
1839 if (cma_any_addr(dst_addr))
1840 ret = cma_resolve_loopback(id_priv);
1841 else
1842 ret = rdma_resolve_ip(&addr_client, &id->route.addr.src_addr,
1843 dst_addr, &id->route.addr.dev_addr,
1844 timeout_ms, addr_handler, id_priv);
1845 if (ret)
1846 goto err;
1847
1848 return 0;
1849 err:
1850 cma_comp_exch(id_priv, CMA_ADDR_QUERY, CMA_ADDR_BOUND);
1851 cma_deref_id(id_priv);
1852 return ret;
1853 }
1854 EXPORT_SYMBOL(rdma_resolve_addr);
1855
1856 static void cma_bind_port(struct rdma_bind_list *bind_list,
1857 struct rdma_id_private *id_priv)
1858 {
1859 struct sockaddr_in *sin;
1860
1861 sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
1862 sin->sin_port = htons(bind_list->port);
1863 id_priv->bind_list = bind_list;
1864 hlist_add_head(&id_priv->node, &bind_list->owners);
1865 }
1866
1867 static int cma_alloc_port(struct idr *ps, struct rdma_id_private *id_priv,
1868 unsigned short snum)
1869 {
1870 struct rdma_bind_list *bind_list;
1871 int port, ret;
1872
1873 bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL);
1874 if (!bind_list)
1875 return -ENOMEM;
1876
1877 do {
1878 ret = idr_get_new_above(ps, bind_list, snum, &port);
1879 } while ((ret == -EAGAIN) && idr_pre_get(ps, GFP_KERNEL));
1880
1881 if (ret)
1882 goto err1;
1883
1884 if (port != snum) {
1885 ret = -EADDRNOTAVAIL;
1886 goto err2;
1887 }
1888
1889 bind_list->ps = ps;
1890 bind_list->port = (unsigned short) port;
1891 cma_bind_port(bind_list, id_priv);
1892 return 0;
1893 err2:
1894 idr_remove(ps, port);
1895 err1:
1896 kfree(bind_list);
1897 return ret;
1898 }
1899
1900 static int cma_alloc_any_port(struct idr *ps, struct rdma_id_private *id_priv)
1901 {
1902 struct rdma_bind_list *bind_list;
1903 int port, ret, low, high;
1904
1905 bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL);
1906 if (!bind_list)
1907 return -ENOMEM;
1908
1909 retry:
1910 /* FIXME: add proper port randomization per like inet_csk_get_port */
1911 do {
1912 ret = idr_get_new_above(ps, bind_list, next_port, &port);
1913 } while ((ret == -EAGAIN) && idr_pre_get(ps, GFP_KERNEL));
1914
1915 if (ret)
1916 goto err1;
1917
1918 inet_get_local_port_range(&low, &high);
1919 if (port > high) {
1920 if (next_port != low) {
1921 idr_remove(ps, port);
1922 next_port = low;
1923 goto retry;
1924 }
1925 ret = -EADDRNOTAVAIL;
1926 goto err2;
1927 }
1928
1929 if (port == high)
1930 next_port = low;
1931 else
1932 next_port = port + 1;
1933
1934 bind_list->ps = ps;
1935 bind_list->port = (unsigned short) port;
1936 cma_bind_port(bind_list, id_priv);
1937 return 0;
1938 err2:
1939 idr_remove(ps, port);
1940 err1:
1941 kfree(bind_list);
1942 return ret;
1943 }
1944
1945 static int cma_use_port(struct idr *ps, struct rdma_id_private *id_priv)
1946 {
1947 struct rdma_id_private *cur_id;
1948 struct sockaddr_in *sin, *cur_sin;
1949 struct rdma_bind_list *bind_list;
1950 struct hlist_node *node;
1951 unsigned short snum;
1952
1953 sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
1954 snum = ntohs(sin->sin_port);
1955 if (snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
1956 return -EACCES;
1957
1958 bind_list = idr_find(ps, snum);
1959 if (!bind_list)
1960 return cma_alloc_port(ps, id_priv, snum);
1961
1962 /*
1963 * We don't support binding to any address if anyone is bound to
1964 * a specific address on the same port.
1965 */
1966 if (cma_any_addr(&id_priv->id.route.addr.src_addr))
1967 return -EADDRNOTAVAIL;
1968
1969 hlist_for_each_entry(cur_id, node, &bind_list->owners, node) {
1970 if (cma_any_addr(&cur_id->id.route.addr.src_addr))
1971 return -EADDRNOTAVAIL;
1972
1973 cur_sin = (struct sockaddr_in *) &cur_id->id.route.addr.src_addr;
1974 if (sin->sin_addr.s_addr == cur_sin->sin_addr.s_addr)
1975 return -EADDRINUSE;
1976 }
1977
1978 cma_bind_port(bind_list, id_priv);
1979 return 0;
1980 }
1981
1982 static int cma_get_port(struct rdma_id_private *id_priv)
1983 {
1984 struct idr *ps;
1985 int ret;
1986
1987 switch (id_priv->id.ps) {
1988 case RDMA_PS_SDP:
1989 ps = &sdp_ps;
1990 break;
1991 case RDMA_PS_TCP:
1992 ps = &tcp_ps;
1993 break;
1994 case RDMA_PS_UDP:
1995 ps = &udp_ps;
1996 break;
1997 case RDMA_PS_IPOIB:
1998 ps = &ipoib_ps;
1999 break;
2000 default:
2001 return -EPROTONOSUPPORT;
2002 }
2003
2004 mutex_lock(&lock);
2005 if (cma_any_port(&id_priv->id.route.addr.src_addr))
2006 ret = cma_alloc_any_port(ps, id_priv);
2007 else
2008 ret = cma_use_port(ps, id_priv);
2009 mutex_unlock(&lock);
2010
2011 return ret;
2012 }
2013
2014 int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr)
2015 {
2016 struct rdma_id_private *id_priv;
2017 int ret;
2018
2019 if (addr->sa_family != AF_INET)
2020 return -EAFNOSUPPORT;
2021
2022 id_priv = container_of(id, struct rdma_id_private, id);
2023 if (!cma_comp_exch(id_priv, CMA_IDLE, CMA_ADDR_BOUND))
2024 return -EINVAL;
2025
2026 if (!cma_any_addr(addr)) {
2027 ret = rdma_translate_ip(addr, &id->route.addr.dev_addr);
2028 if (ret)
2029 goto err1;
2030
2031 mutex_lock(&lock);
2032 ret = cma_acquire_dev(id_priv);
2033 mutex_unlock(&lock);
2034 if (ret)
2035 goto err1;
2036 }
2037
2038 memcpy(&id->route.addr.src_addr, addr, ip_addr_size(addr));
2039 ret = cma_get_port(id_priv);
2040 if (ret)
2041 goto err2;
2042
2043 return 0;
2044 err2:
2045 if (!cma_any_addr(addr)) {
2046 mutex_lock(&lock);
2047 cma_detach_from_dev(id_priv);
2048 mutex_unlock(&lock);
2049 }
2050 err1:
2051 cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_IDLE);
2052 return ret;
2053 }
2054 EXPORT_SYMBOL(rdma_bind_addr);
2055
2056 static int cma_format_hdr(void *hdr, enum rdma_port_space ps,
2057 struct rdma_route *route)
2058 {
2059 struct sockaddr_in *src4, *dst4;
2060 struct cma_hdr *cma_hdr;
2061 struct sdp_hh *sdp_hdr;
2062
2063 src4 = (struct sockaddr_in *) &route->addr.src_addr;
2064 dst4 = (struct sockaddr_in *) &route->addr.dst_addr;
2065
2066 switch (ps) {
2067 case RDMA_PS_SDP:
2068 sdp_hdr = hdr;
2069 if (sdp_get_majv(sdp_hdr->sdp_version) != SDP_MAJ_VERSION)
2070 return -EINVAL;
2071 sdp_set_ip_ver(sdp_hdr, 4);
2072 sdp_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
2073 sdp_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
2074 sdp_hdr->port = src4->sin_port;
2075 break;
2076 default:
2077 cma_hdr = hdr;
2078 cma_hdr->cma_version = CMA_VERSION;
2079 cma_set_ip_ver(cma_hdr, 4);
2080 cma_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
2081 cma_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
2082 cma_hdr->port = src4->sin_port;
2083 break;
2084 }
2085 return 0;
2086 }
2087
2088 static int cma_sidr_rep_handler(struct ib_cm_id *cm_id,
2089 struct ib_cm_event *ib_event)
2090 {
2091 struct rdma_id_private *id_priv = cm_id->context;
2092 struct rdma_cm_event event;
2093 struct ib_cm_sidr_rep_event_param *rep = &ib_event->param.sidr_rep_rcvd;
2094 int ret = 0;
2095
2096 if (cma_disable_remove(id_priv, CMA_CONNECT))
2097 return 0;
2098
2099 memset(&event, 0, sizeof event);
2100 switch (ib_event->event) {
2101 case IB_CM_SIDR_REQ_ERROR:
2102 event.event = RDMA_CM_EVENT_UNREACHABLE;
2103 event.status = -ETIMEDOUT;
2104 break;
2105 case IB_CM_SIDR_REP_RECEIVED:
2106 event.param.ud.private_data = ib_event->private_data;
2107 event.param.ud.private_data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
2108 if (rep->status != IB_SIDR_SUCCESS) {
2109 event.event = RDMA_CM_EVENT_UNREACHABLE;
2110 event.status = ib_event->param.sidr_rep_rcvd.status;
2111 break;
2112 }
2113 if (id_priv->qkey != rep->qkey) {
2114 event.event = RDMA_CM_EVENT_UNREACHABLE;
2115 event.status = -EINVAL;
2116 break;
2117 }
2118 ib_init_ah_from_path(id_priv->id.device, id_priv->id.port_num,
2119 id_priv->id.route.path_rec,
2120 &event.param.ud.ah_attr);
2121 event.param.ud.qp_num = rep->qpn;
2122 event.param.ud.qkey = rep->qkey;
2123 event.event = RDMA_CM_EVENT_ESTABLISHED;
2124 event.status = 0;
2125 break;
2126 default:
2127 printk(KERN_ERR "RDMA CMA: unexpected IB CM event: %d",
2128 ib_event->event);
2129 goto out;
2130 }
2131
2132 ret = id_priv->id.event_handler(&id_priv->id, &event);
2133 if (ret) {
2134 /* Destroy the CM ID by returning a non-zero value. */
2135 id_priv->cm_id.ib = NULL;
2136 cma_exch(id_priv, CMA_DESTROYING);
2137 cma_enable_remove(id_priv);
2138 rdma_destroy_id(&id_priv->id);
2139 return ret;
2140 }
2141 out:
2142 cma_enable_remove(id_priv);
2143 return ret;
2144 }
2145
2146 static int cma_resolve_ib_udp(struct rdma_id_private *id_priv,
2147 struct rdma_conn_param *conn_param)
2148 {
2149 struct ib_cm_sidr_req_param req;
2150 struct rdma_route *route;
2151 int ret;
2152
2153 req.private_data_len = sizeof(struct cma_hdr) +
2154 conn_param->private_data_len;
2155 req.private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
2156 if (!req.private_data)
2157 return -ENOMEM;
2158
2159 if (conn_param->private_data && conn_param->private_data_len)
2160 memcpy((void *) req.private_data + sizeof(struct cma_hdr),
2161 conn_param->private_data, conn_param->private_data_len);
2162
2163 route = &id_priv->id.route;
2164 ret = cma_format_hdr((void *) req.private_data, id_priv->id.ps, route);
2165 if (ret)
2166 goto out;
2167
2168 id_priv->cm_id.ib = ib_create_cm_id(id_priv->id.device,
2169 cma_sidr_rep_handler, id_priv);
2170 if (IS_ERR(id_priv->cm_id.ib)) {
2171 ret = PTR_ERR(id_priv->cm_id.ib);
2172 goto out;
2173 }
2174
2175 req.path = route->path_rec;
2176 req.service_id = cma_get_service_id(id_priv->id.ps,
2177 &route->addr.dst_addr);
2178 req.timeout_ms = 1 << (CMA_CM_RESPONSE_TIMEOUT - 8);
2179 req.max_cm_retries = CMA_MAX_CM_RETRIES;
2180
2181 ret = ib_send_cm_sidr_req(id_priv->cm_id.ib, &req);
2182 if (ret) {
2183 ib_destroy_cm_id(id_priv->cm_id.ib);
2184 id_priv->cm_id.ib = NULL;
2185 }
2186 out:
2187 kfree(req.private_data);
2188 return ret;
2189 }
2190
2191 static int cma_connect_ib(struct rdma_id_private *id_priv,
2192 struct rdma_conn_param *conn_param)
2193 {
2194 struct ib_cm_req_param req;
2195 struct rdma_route *route;
2196 void *private_data;
2197 int offset, ret;
2198
2199 memset(&req, 0, sizeof req);
2200 offset = cma_user_data_offset(id_priv->id.ps);
2201 req.private_data_len = offset + conn_param->private_data_len;
2202 private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
2203 if (!private_data)
2204 return -ENOMEM;
2205
2206 if (conn_param->private_data && conn_param->private_data_len)
2207 memcpy(private_data + offset, conn_param->private_data,
2208 conn_param->private_data_len);
2209
2210 id_priv->cm_id.ib = ib_create_cm_id(id_priv->id.device, cma_ib_handler,
2211 id_priv);
2212 if (IS_ERR(id_priv->cm_id.ib)) {
2213 ret = PTR_ERR(id_priv->cm_id.ib);
2214 goto out;
2215 }
2216
2217 route = &id_priv->id.route;
2218 ret = cma_format_hdr(private_data, id_priv->id.ps, route);
2219 if (ret)
2220 goto out;
2221 req.private_data = private_data;
2222
2223 req.primary_path = &route->path_rec[0];
2224 if (route->num_paths == 2)
2225 req.alternate_path = &route->path_rec[1];
2226
2227 req.service_id = cma_get_service_id(id_priv->id.ps,
2228 &route->addr.dst_addr);
2229 req.qp_num = id_priv->qp_num;
2230 req.qp_type = IB_QPT_RC;
2231 req.starting_psn = id_priv->seq_num;
2232 req.responder_resources = conn_param->responder_resources;
2233 req.initiator_depth = conn_param->initiator_depth;
2234 req.flow_control = conn_param->flow_control;
2235 req.retry_count = conn_param->retry_count;
2236 req.rnr_retry_count = conn_param->rnr_retry_count;
2237 req.remote_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
2238 req.local_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
2239 req.max_cm_retries = CMA_MAX_CM_RETRIES;
2240 req.srq = id_priv->srq ? 1 : 0;
2241
2242 ret = ib_send_cm_req(id_priv->cm_id.ib, &req);
2243 out:
2244 if (ret && !IS_ERR(id_priv->cm_id.ib)) {
2245 ib_destroy_cm_id(id_priv->cm_id.ib);
2246 id_priv->cm_id.ib = NULL;
2247 }
2248
2249 kfree(private_data);
2250 return ret;
2251 }
2252
2253 static int cma_connect_iw(struct rdma_id_private *id_priv,
2254 struct rdma_conn_param *conn_param)
2255 {
2256 struct iw_cm_id *cm_id;
2257 struct sockaddr_in* sin;
2258 int ret;
2259 struct iw_cm_conn_param iw_param;
2260
2261 cm_id = iw_create_cm_id(id_priv->id.device, cma_iw_handler, id_priv);
2262 if (IS_ERR(cm_id)) {
2263 ret = PTR_ERR(cm_id);
2264 goto out;
2265 }
2266
2267 id_priv->cm_id.iw = cm_id;
2268
2269 sin = (struct sockaddr_in*) &id_priv->id.route.addr.src_addr;
2270 cm_id->local_addr = *sin;
2271
2272 sin = (struct sockaddr_in*) &id_priv->id.route.addr.dst_addr;
2273 cm_id->remote_addr = *sin;
2274
2275 ret = cma_modify_qp_rtr(id_priv);
2276 if (ret)
2277 goto out;
2278
2279 iw_param.ord = conn_param->initiator_depth;
2280 iw_param.ird = conn_param->responder_resources;
2281 iw_param.private_data = conn_param->private_data;
2282 iw_param.private_data_len = conn_param->private_data_len;
2283 if (id_priv->id.qp)
2284 iw_param.qpn = id_priv->qp_num;
2285 else
2286 iw_param.qpn = conn_param->qp_num;
2287 ret = iw_cm_connect(cm_id, &iw_param);
2288 out:
2289 if (ret && !IS_ERR(cm_id)) {
2290 iw_destroy_cm_id(cm_id);
2291 id_priv->cm_id.iw = NULL;
2292 }
2293 return ret;
2294 }
2295
2296 int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
2297 {
2298 struct rdma_id_private *id_priv;
2299 int ret;
2300
2301 id_priv = container_of(id, struct rdma_id_private, id);
2302 if (!cma_comp_exch(id_priv, CMA_ROUTE_RESOLVED, CMA_CONNECT))
2303 return -EINVAL;
2304
2305 if (!id->qp) {
2306 id_priv->qp_num = conn_param->qp_num;
2307 id_priv->srq = conn_param->srq;
2308 }
2309
2310 switch (rdma_node_get_transport(id->device->node_type)) {
2311 case RDMA_TRANSPORT_IB:
2312 if (cma_is_ud_ps(id->ps))
2313 ret = cma_resolve_ib_udp(id_priv, conn_param);
2314 else
2315 ret = cma_connect_ib(id_priv, conn_param);
2316 break;
2317 case RDMA_TRANSPORT_IWARP:
2318 ret = cma_connect_iw(id_priv, conn_param);
2319 break;
2320 default:
2321 ret = -ENOSYS;
2322 break;
2323 }
2324 if (ret)
2325 goto err;
2326
2327 return 0;
2328 err:
2329 cma_comp_exch(id_priv, CMA_CONNECT, CMA_ROUTE_RESOLVED);
2330 return ret;
2331 }
2332 EXPORT_SYMBOL(rdma_connect);
2333
2334 static int cma_accept_ib(struct rdma_id_private *id_priv,
2335 struct rdma_conn_param *conn_param)
2336 {
2337 struct ib_cm_rep_param rep;
2338 struct ib_qp_attr qp_attr;
2339 int qp_attr_mask, ret;
2340
2341 if (id_priv->id.qp) {
2342 ret = cma_modify_qp_rtr(id_priv);
2343 if (ret)
2344 goto out;
2345
2346 qp_attr.qp_state = IB_QPS_RTS;
2347 ret = ib_cm_init_qp_attr(id_priv->cm_id.ib, &qp_attr,
2348 &qp_attr_mask);
2349 if (ret)
2350 goto out;
2351
2352 qp_attr.max_rd_atomic = conn_param->initiator_depth;
2353 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
2354 if (ret)
2355 goto out;
2356 }
2357
2358 memset(&rep, 0, sizeof rep);
2359 rep.qp_num = id_priv->qp_num;
2360 rep.starting_psn = id_priv->seq_num;
2361 rep.private_data = conn_param->private_data;
2362 rep.private_data_len = conn_param->private_data_len;
2363 rep.responder_resources = conn_param->responder_resources;
2364 rep.initiator_depth = conn_param->initiator_depth;
2365 rep.failover_accepted = 0;
2366 rep.flow_control = conn_param->flow_control;
2367 rep.rnr_retry_count = conn_param->rnr_retry_count;
2368 rep.srq = id_priv->srq ? 1 : 0;
2369
2370 ret = ib_send_cm_rep(id_priv->cm_id.ib, &rep);
2371 out:
2372 return ret;
2373 }
2374
2375 static int cma_accept_iw(struct rdma_id_private *id_priv,
2376 struct rdma_conn_param *conn_param)
2377 {
2378 struct iw_cm_conn_param iw_param;
2379 int ret;
2380
2381 ret = cma_modify_qp_rtr(id_priv);
2382 if (ret)
2383 return ret;
2384
2385 iw_param.ord = conn_param->initiator_depth;
2386 iw_param.ird = conn_param->responder_resources;
2387 iw_param.private_data = conn_param->private_data;
2388 iw_param.private_data_len = conn_param->private_data_len;
2389 if (id_priv->id.qp) {
2390 iw_param.qpn = id_priv->qp_num;
2391 } else
2392 iw_param.qpn = conn_param->qp_num;
2393
2394 return iw_cm_accept(id_priv->cm_id.iw, &iw_param);
2395 }
2396
2397 static int cma_send_sidr_rep(struct rdma_id_private *id_priv,
2398 enum ib_cm_sidr_status status,
2399 const void *private_data, int private_data_len)
2400 {
2401 struct ib_cm_sidr_rep_param rep;
2402
2403 memset(&rep, 0, sizeof rep);
2404 rep.status = status;
2405 if (status == IB_SIDR_SUCCESS) {
2406 rep.qp_num = id_priv->qp_num;
2407 rep.qkey = id_priv->qkey;
2408 }
2409 rep.private_data = private_data;
2410 rep.private_data_len = private_data_len;
2411
2412 return ib_send_cm_sidr_rep(id_priv->cm_id.ib, &rep);
2413 }
2414
2415 int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
2416 {
2417 struct rdma_id_private *id_priv;
2418 int ret;
2419
2420 id_priv = container_of(id, struct rdma_id_private, id);
2421 if (!cma_comp(id_priv, CMA_CONNECT))
2422 return -EINVAL;
2423
2424 if (!id->qp && conn_param) {
2425 id_priv->qp_num = conn_param->qp_num;
2426 id_priv->srq = conn_param->srq;
2427 }
2428
2429 switch (rdma_node_get_transport(id->device->node_type)) {
2430 case RDMA_TRANSPORT_IB:
2431 if (cma_is_ud_ps(id->ps))
2432 ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
2433 conn_param->private_data,
2434 conn_param->private_data_len);
2435 else if (conn_param)
2436 ret = cma_accept_ib(id_priv, conn_param);
2437 else
2438 ret = cma_rep_recv(id_priv);
2439 break;
2440 case RDMA_TRANSPORT_IWARP:
2441 ret = cma_accept_iw(id_priv, conn_param);
2442 break;
2443 default:
2444 ret = -ENOSYS;
2445 break;
2446 }
2447
2448 if (ret)
2449 goto reject;
2450
2451 return 0;
2452 reject:
2453 cma_modify_qp_err(id_priv);
2454 rdma_reject(id, NULL, 0);
2455 return ret;
2456 }
2457 EXPORT_SYMBOL(rdma_accept);
2458
2459 int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event)
2460 {
2461 struct rdma_id_private *id_priv;
2462 int ret;
2463
2464 id_priv = container_of(id, struct rdma_id_private, id);
2465 if (!cma_has_cm_dev(id_priv))
2466 return -EINVAL;
2467
2468 switch (id->device->node_type) {
2469 case RDMA_NODE_IB_CA:
2470 ret = ib_cm_notify(id_priv->cm_id.ib, event);
2471 break;
2472 default:
2473 ret = 0;
2474 break;
2475 }
2476 return ret;
2477 }
2478 EXPORT_SYMBOL(rdma_notify);
2479
2480 int rdma_reject(struct rdma_cm_id *id, const void *private_data,
2481 u8 private_data_len)
2482 {
2483 struct rdma_id_private *id_priv;
2484 int ret;
2485
2486 id_priv = container_of(id, struct rdma_id_private, id);
2487 if (!cma_has_cm_dev(id_priv))
2488 return -EINVAL;
2489
2490 switch (rdma_node_get_transport(id->device->node_type)) {
2491 case RDMA_TRANSPORT_IB:
2492 if (cma_is_ud_ps(id->ps))
2493 ret = cma_send_sidr_rep(id_priv, IB_SIDR_REJECT,
2494 private_data, private_data_len);
2495 else
2496 ret = ib_send_cm_rej(id_priv->cm_id.ib,
2497 IB_CM_REJ_CONSUMER_DEFINED, NULL,
2498 0, private_data, private_data_len);
2499 break;
2500 case RDMA_TRANSPORT_IWARP:
2501 ret = iw_cm_reject(id_priv->cm_id.iw,
2502 private_data, private_data_len);
2503 break;
2504 default:
2505 ret = -ENOSYS;
2506 break;
2507 }
2508 return ret;
2509 }
2510 EXPORT_SYMBOL(rdma_reject);
2511
2512 int rdma_disconnect(struct rdma_cm_id *id)
2513 {
2514 struct rdma_id_private *id_priv;
2515 int ret;
2516
2517 id_priv = container_of(id, struct rdma_id_private, id);
2518 if (!cma_has_cm_dev(id_priv))
2519 return -EINVAL;
2520
2521 switch (rdma_node_get_transport(id->device->node_type)) {
2522 case RDMA_TRANSPORT_IB:
2523 ret = cma_modify_qp_err(id_priv);
2524 if (ret)
2525 goto out;
2526 /* Initiate or respond to a disconnect. */
2527 if (ib_send_cm_dreq(id_priv->cm_id.ib, NULL, 0))
2528 ib_send_cm_drep(id_priv->cm_id.ib, NULL, 0);
2529 break;
2530 case RDMA_TRANSPORT_IWARP:
2531 ret = iw_cm_disconnect(id_priv->cm_id.iw, 0);
2532 break;
2533 default:
2534 ret = -EINVAL;
2535 break;
2536 }
2537 out:
2538 return ret;
2539 }
2540 EXPORT_SYMBOL(rdma_disconnect);
2541
2542 static int cma_ib_mc_handler(int status, struct ib_sa_multicast *multicast)
2543 {
2544 struct rdma_id_private *id_priv;
2545 struct cma_multicast *mc = multicast->context;
2546 struct rdma_cm_event event;
2547 int ret;
2548
2549 id_priv = mc->id_priv;
2550 if (cma_disable_remove(id_priv, CMA_ADDR_BOUND) &&
2551 cma_disable_remove(id_priv, CMA_ADDR_RESOLVED))
2552 return 0;
2553
2554 mutex_lock(&id_priv->qp_mutex);
2555 if (!status && id_priv->id.qp)
2556 status = ib_attach_mcast(id_priv->id.qp, &multicast->rec.mgid,
2557 multicast->rec.mlid);
2558 mutex_unlock(&id_priv->qp_mutex);
2559
2560 memset(&event, 0, sizeof event);
2561 event.status = status;
2562 event.param.ud.private_data = mc->context;
2563 if (!status) {
2564 event.event = RDMA_CM_EVENT_MULTICAST_JOIN;
2565 ib_init_ah_from_mcmember(id_priv->id.device,
2566 id_priv->id.port_num, &multicast->rec,
2567 &event.param.ud.ah_attr);
2568 event.param.ud.qp_num = 0xFFFFFF;
2569 event.param.ud.qkey = be32_to_cpu(multicast->rec.qkey);
2570 } else
2571 event.event = RDMA_CM_EVENT_MULTICAST_ERROR;
2572
2573 ret = id_priv->id.event_handler(&id_priv->id, &event);
2574 if (ret) {
2575 cma_exch(id_priv, CMA_DESTROYING);
2576 cma_enable_remove(id_priv);
2577 rdma_destroy_id(&id_priv->id);
2578 return 0;
2579 }
2580
2581 cma_enable_remove(id_priv);
2582 return 0;
2583 }
2584
2585 static void cma_set_mgid(struct rdma_id_private *id_priv,
2586 struct sockaddr *addr, union ib_gid *mgid)
2587 {
2588 unsigned char mc_map[MAX_ADDR_LEN];
2589 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
2590 struct sockaddr_in *sin = (struct sockaddr_in *) addr;
2591 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) addr;
2592
2593 if (cma_any_addr(addr)) {
2594 memset(mgid, 0, sizeof *mgid);
2595 } else if ((addr->sa_family == AF_INET6) &&
2596 ((be32_to_cpu(sin6->sin6_addr.s6_addr32[0]) & 0xFF10A01B) ==
2597 0xFF10A01B)) {
2598 /* IPv6 address is an SA assigned MGID. */
2599 memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
2600 } else {
2601 ip_ib_mc_map(sin->sin_addr.s_addr, mc_map);
2602 if (id_priv->id.ps == RDMA_PS_UDP)
2603 mc_map[7] = 0x01; /* Use RDMA CM signature */
2604 mc_map[8] = ib_addr_get_pkey(dev_addr) >> 8;
2605 mc_map[9] = (unsigned char) ib_addr_get_pkey(dev_addr);
2606 *mgid = *(union ib_gid *) (mc_map + 4);
2607 }
2608 }
2609
2610 static int cma_join_ib_multicast(struct rdma_id_private *id_priv,
2611 struct cma_multicast *mc)
2612 {
2613 struct ib_sa_mcmember_rec rec;
2614 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
2615 ib_sa_comp_mask comp_mask;
2616 int ret;
2617
2618 ib_addr_get_mgid(dev_addr, &rec.mgid);
2619 ret = ib_sa_get_mcmember_rec(id_priv->id.device, id_priv->id.port_num,
2620 &rec.mgid, &rec);
2621 if (ret)
2622 return ret;
2623
2624 cma_set_mgid(id_priv, &mc->addr, &rec.mgid);
2625 if (id_priv->id.ps == RDMA_PS_UDP)
2626 rec.qkey = cpu_to_be32(RDMA_UDP_QKEY);
2627 ib_addr_get_sgid(dev_addr, &rec.port_gid);
2628 rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
2629 rec.join_state = 1;
2630
2631 comp_mask = IB_SA_MCMEMBER_REC_MGID | IB_SA_MCMEMBER_REC_PORT_GID |
2632 IB_SA_MCMEMBER_REC_PKEY | IB_SA_MCMEMBER_REC_JOIN_STATE |
2633 IB_SA_MCMEMBER_REC_QKEY | IB_SA_MCMEMBER_REC_SL |
2634 IB_SA_MCMEMBER_REC_FLOW_LABEL |
2635 IB_SA_MCMEMBER_REC_TRAFFIC_CLASS;
2636
2637 mc->multicast.ib = ib_sa_join_multicast(&sa_client, id_priv->id.device,
2638 id_priv->id.port_num, &rec,
2639 comp_mask, GFP_KERNEL,
2640 cma_ib_mc_handler, mc);
2641 if (IS_ERR(mc->multicast.ib))
2642 return PTR_ERR(mc->multicast.ib);
2643
2644 return 0;
2645 }
2646
2647 int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
2648 void *context)
2649 {
2650 struct rdma_id_private *id_priv;
2651 struct cma_multicast *mc;
2652 int ret;
2653
2654 id_priv = container_of(id, struct rdma_id_private, id);
2655 if (!cma_comp(id_priv, CMA_ADDR_BOUND) &&
2656 !cma_comp(id_priv, CMA_ADDR_RESOLVED))
2657 return -EINVAL;
2658
2659 mc = kmalloc(sizeof *mc, GFP_KERNEL);
2660 if (!mc)
2661 return -ENOMEM;
2662
2663 memcpy(&mc->addr, addr, ip_addr_size(addr));
2664 mc->context = context;
2665 mc->id_priv = id_priv;
2666
2667 spin_lock(&id_priv->lock);
2668 list_add(&mc->list, &id_priv->mc_list);
2669 spin_unlock(&id_priv->lock);
2670
2671 switch (rdma_node_get_transport(id->device->node_type)) {
2672 case RDMA_TRANSPORT_IB:
2673 ret = cma_join_ib_multicast(id_priv, mc);
2674 break;
2675 default:
2676 ret = -ENOSYS;
2677 break;
2678 }
2679
2680 if (ret) {
2681 spin_lock_irq(&id_priv->lock);
2682 list_del(&mc->list);
2683 spin_unlock_irq(&id_priv->lock);
2684 kfree(mc);
2685 }
2686 return ret;
2687 }
2688 EXPORT_SYMBOL(rdma_join_multicast);
2689
2690 void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr)
2691 {
2692 struct rdma_id_private *id_priv;
2693 struct cma_multicast *mc;
2694
2695 id_priv = container_of(id, struct rdma_id_private, id);
2696 spin_lock_irq(&id_priv->lock);
2697 list_for_each_entry(mc, &id_priv->mc_list, list) {
2698 if (!memcmp(&mc->addr, addr, ip_addr_size(addr))) {
2699 list_del(&mc->list);
2700 spin_unlock_irq(&id_priv->lock);
2701
2702 if (id->qp)
2703 ib_detach_mcast(id->qp,
2704 &mc->multicast.ib->rec.mgid,
2705 mc->multicast.ib->rec.mlid);
2706 ib_sa_free_multicast(mc->multicast.ib);
2707 kfree(mc);
2708 return;
2709 }
2710 }
2711 spin_unlock_irq(&id_priv->lock);
2712 }
2713 EXPORT_SYMBOL(rdma_leave_multicast);
2714
2715 static void cma_add_one(struct ib_device *device)
2716 {
2717 struct cma_device *cma_dev;
2718 struct rdma_id_private *id_priv;
2719
2720 cma_dev = kmalloc(sizeof *cma_dev, GFP_KERNEL);
2721 if (!cma_dev)
2722 return;
2723
2724 cma_dev->device = device;
2725
2726 init_completion(&cma_dev->comp);
2727 atomic_set(&cma_dev->refcount, 1);
2728 INIT_LIST_HEAD(&cma_dev->id_list);
2729 ib_set_client_data(device, &cma_client, cma_dev);
2730
2731 mutex_lock(&lock);
2732 list_add_tail(&cma_dev->list, &dev_list);
2733 list_for_each_entry(id_priv, &listen_any_list, list)
2734 cma_listen_on_dev(id_priv, cma_dev);
2735 mutex_unlock(&lock);
2736 }
2737
2738 static int cma_remove_id_dev(struct rdma_id_private *id_priv)
2739 {
2740 struct rdma_cm_event event;
2741 enum cma_state state;
2742
2743 /* Record that we want to remove the device */
2744 state = cma_exch(id_priv, CMA_DEVICE_REMOVAL);
2745 if (state == CMA_DESTROYING)
2746 return 0;
2747
2748 cma_cancel_operation(id_priv, state);
2749 wait_event(id_priv->wait_remove, !atomic_read(&id_priv->dev_remove));
2750
2751 /* Check for destruction from another callback. */
2752 if (!cma_comp(id_priv, CMA_DEVICE_REMOVAL))
2753 return 0;
2754
2755 memset(&event, 0, sizeof event);
2756 event.event = RDMA_CM_EVENT_DEVICE_REMOVAL;
2757 return id_priv->id.event_handler(&id_priv->id, &event);
2758 }
2759
2760 static void cma_process_remove(struct cma_device *cma_dev)
2761 {
2762 struct rdma_id_private *id_priv;
2763 int ret;
2764
2765 mutex_lock(&lock);
2766 while (!list_empty(&cma_dev->id_list)) {
2767 id_priv = list_entry(cma_dev->id_list.next,
2768 struct rdma_id_private, list);
2769
2770 list_del(&id_priv->listen_list);
2771 list_del_init(&id_priv->list);
2772 atomic_inc(&id_priv->refcount);
2773 mutex_unlock(&lock);
2774
2775 ret = id_priv->internal_id ? 1 : cma_remove_id_dev(id_priv);
2776 cma_deref_id(id_priv);
2777 if (ret)
2778 rdma_destroy_id(&id_priv->id);
2779
2780 mutex_lock(&lock);
2781 }
2782 mutex_unlock(&lock);
2783
2784 cma_deref_dev(cma_dev);
2785 wait_for_completion(&cma_dev->comp);
2786 }
2787
2788 static void cma_remove_one(struct ib_device *device)
2789 {
2790 struct cma_device *cma_dev;
2791
2792 cma_dev = ib_get_client_data(device, &cma_client);
2793 if (!cma_dev)
2794 return;
2795
2796 mutex_lock(&lock);
2797 list_del(&cma_dev->list);
2798 mutex_unlock(&lock);
2799
2800 cma_process_remove(cma_dev);
2801 kfree(cma_dev);
2802 }
2803
2804 static int cma_init(void)
2805 {
2806 int ret, low, high, remaining;
2807
2808 get_random_bytes(&next_port, sizeof next_port);
2809 inet_get_local_port_range(&low, &high);
2810 remaining = (high - low) + 1;
2811 next_port = ((unsigned int) next_port % remaining) + low;
2812
2813 cma_wq = create_singlethread_workqueue("rdma_cm");
2814 if (!cma_wq)
2815 return -ENOMEM;
2816
2817 ib_sa_register_client(&sa_client);
2818 rdma_addr_register_client(&addr_client);
2819
2820 ret = ib_register_client(&cma_client);
2821 if (ret)
2822 goto err;
2823 return 0;
2824
2825 err:
2826 rdma_addr_unregister_client(&addr_client);
2827 ib_sa_unregister_client(&sa_client);
2828 destroy_workqueue(cma_wq);
2829 return ret;
2830 }
2831
2832 static void cma_cleanup(void)
2833 {
2834 ib_unregister_client(&cma_client);
2835 rdma_addr_unregister_client(&addr_client);
2836 ib_sa_unregister_client(&sa_client);
2837 destroy_workqueue(cma_wq);
2838 idr_destroy(&sdp_ps);
2839 idr_destroy(&tcp_ps);
2840 idr_destroy(&udp_ps);
2841 idr_destroy(&ipoib_ps);
2842 }
2843
2844 module_init(cma_init);
2845 module_exit(cma_cleanup);
kernel source for telekom puls (alcatel/mediatek)