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Staging: samsung-laptop: fix up some sysfs attribute permissions
[linux/fpc-iii.git] / drivers / infiniband / core / cma.c
blob875e34e0b235d93a68b44290fbc7f1417104773c
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 available to you under a choice of one of two
8 * licenses. You may choose to be licensed under the terms of the GNU
9 * General Public License (GPL) Version 2, available from the file
10 * COPYING in the main directory of this source tree, or the
11 * OpenIB.org BSD license below:
12 *
13 * Redistribution and use in source and binary forms, with or
14 * without modification, are permitted provided that the following
15 * conditions are met:
16 *
17 * - Redistributions of source code must retain the above
18 * copyright notice, this list of conditions and the following
19 * disclaimer.
20 *
21 * - Redistributions in binary form must reproduce the above
22 * copyright notice, this list of conditions and the following
23 * disclaimer in the documentation and/or other materials
24 * provided with the distribution.
25 *
26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
33 * SOFTWARE.
34 */
35
36 #include <linux/completion.h>
37 #include <linux/in.h>
38 #include <linux/in6.h>
39 #include <linux/mutex.h>
40 #include <linux/random.h>
41 #include <linux/idr.h>
42 #include <linux/inetdevice.h>
43
44 #include <net/tcp.h>
45 #include <net/ipv6.h>
46
47 #include <rdma/rdma_cm.h>
48 #include <rdma/rdma_cm_ib.h>
49 #include <rdma/ib_cache.h>
50 #include <rdma/ib_cm.h>
51 #include <rdma/ib_sa.h>
52 #include <rdma/iw_cm.h>
53
54 MODULE_AUTHOR("Sean Hefty");
55 MODULE_DESCRIPTION("Generic RDMA CM Agent");
56 MODULE_LICENSE("Dual BSD/GPL");
57
58 #define CMA_CM_RESPONSE_TIMEOUT 20
59 #define CMA_MAX_CM_RETRIES 15
60 #define CMA_CM_MRA_SETTING (IB_CM_MRA_FLAG_DELAY | 24)
61
62 static void cma_add_one(struct ib_device *device);
63 static void cma_remove_one(struct ib_device *device);
64
65 static struct ib_client cma_client = {
66 .name = "cma",
67 .add = cma_add_one,
68 .remove = cma_remove_one
69 };
70
71 static struct ib_sa_client sa_client;
72 static struct rdma_addr_client addr_client;
73 static LIST_HEAD(dev_list);
74 static LIST_HEAD(listen_any_list);
75 static DEFINE_MUTEX(lock);
76 static struct workqueue_struct *cma_wq;
77 static DEFINE_IDR(sdp_ps);
78 static DEFINE_IDR(tcp_ps);
79 static DEFINE_IDR(udp_ps);
80 static DEFINE_IDR(ipoib_ps);
81 static int next_port;
82
83 struct cma_device {
84 struct list_head list;
85 struct ib_device *device;
86 struct completion comp;
87 atomic_t refcount;
88 struct list_head id_list;
89 };
90
91 enum cma_state {
92 CMA_IDLE,
93 CMA_ADDR_QUERY,
94 CMA_ADDR_RESOLVED,
95 CMA_ROUTE_QUERY,
96 CMA_ROUTE_RESOLVED,
97 CMA_CONNECT,
98 CMA_DISCONNECT,
99 CMA_ADDR_BOUND,
100 CMA_LISTEN,
101 CMA_DEVICE_REMOVAL,
102 CMA_DESTROYING
103 };
104
105 struct rdma_bind_list {
106 struct idr *ps;
107 struct hlist_head owners;
108 unsigned short port;
109 };
110
111 /*
112 * Device removal can occur at anytime, so we need extra handling to
113 * serialize notifying the user of device removal with other callbacks.
114 * We do this by disabling removal notification while a callback is in process,
115 * and reporting it after the callback completes.
116 */
117 struct rdma_id_private {
118 struct rdma_cm_id id;
119
120 struct rdma_bind_list *bind_list;
121 struct hlist_node node;
122 struct list_head list; /* listen_any_list or cma_device.list */
123 struct list_head listen_list; /* per device listens */
124 struct cma_device *cma_dev;
125 struct list_head mc_list;
126
127 int internal_id;
128 enum cma_state state;
129 spinlock_t lock;
130 struct mutex qp_mutex;
131
132 struct completion comp;
133 atomic_t refcount;
134 struct mutex handler_mutex;
135
136 int backlog;
137 int timeout_ms;
138 struct ib_sa_query *query;
139 int query_id;
140 union {
141 struct ib_cm_id *ib;
142 struct iw_cm_id *iw;
143 } cm_id;
144
145 u32 seq_num;
146 u32 qkey;
147 u32 qp_num;
148 u8 srq;
149 u8 tos;
150 };
151
152 struct cma_multicast {
153 struct rdma_id_private *id_priv;
154 union {
155 struct ib_sa_multicast *ib;
156 } multicast;
157 struct list_head list;
158 void *context;
159 struct sockaddr_storage addr;
160 };
161
162 struct cma_work {
163 struct work_struct work;
164 struct rdma_id_private *id;
165 enum cma_state old_state;
166 enum cma_state new_state;
167 struct rdma_cm_event event;
168 };
169
170 struct cma_ndev_work {
171 struct work_struct work;
172 struct rdma_id_private *id;
173 struct rdma_cm_event event;
174 };
175
176 union cma_ip_addr {
177 struct in6_addr ip6;
178 struct {
179 __be32 pad[3];
180 __be32 addr;
181 } ip4;
182 };
183
184 struct cma_hdr {
185 u8 cma_version;
186 u8 ip_version; /* IP version: 7:4 */
187 __be16 port;
188 union cma_ip_addr src_addr;
189 union cma_ip_addr dst_addr;
190 };
191
192 struct sdp_hh {
193 u8 bsdh[16];
194 u8 sdp_version; /* Major version: 7:4 */
195 u8 ip_version; /* IP version: 7:4 */
196 u8 sdp_specific1[10];
197 __be16 port;
198 __be16 sdp_specific2;
199 union cma_ip_addr src_addr;
200 union cma_ip_addr dst_addr;
201 };
202
203 struct sdp_hah {
204 u8 bsdh[16];
205 u8 sdp_version;
206 };
207
208 #define CMA_VERSION 0x00
209 #define SDP_MAJ_VERSION 0x2
210
211 static int cma_comp(struct rdma_id_private *id_priv, enum cma_state comp)
212 {
213 unsigned long flags;
214 int ret;
215
216 spin_lock_irqsave(&id_priv->lock, flags);
217 ret = (id_priv->state == comp);
218 spin_unlock_irqrestore(&id_priv->lock, flags);
219 return ret;
220 }
221
222 static int cma_comp_exch(struct rdma_id_private *id_priv,
223 enum cma_state comp, enum cma_state exch)
224 {
225 unsigned long flags;
226 int ret;
227
228 spin_lock_irqsave(&id_priv->lock, flags);
229 if ((ret = (id_priv->state == comp)))
230 id_priv->state = exch;
231 spin_unlock_irqrestore(&id_priv->lock, flags);
232 return ret;
233 }
234
235 static enum cma_state cma_exch(struct rdma_id_private *id_priv,
236 enum cma_state exch)
237 {
238 unsigned long flags;
239 enum cma_state old;
240
241 spin_lock_irqsave(&id_priv->lock, flags);
242 old = id_priv->state;
243 id_priv->state = exch;
244 spin_unlock_irqrestore(&id_priv->lock, flags);
245 return old;
246 }
247
248 static inline u8 cma_get_ip_ver(struct cma_hdr *hdr)
249 {
250 return hdr->ip_version >> 4;
251 }
252
253 static inline void cma_set_ip_ver(struct cma_hdr *hdr, u8 ip_ver)
254 {
255 hdr->ip_version = (ip_ver << 4) | (hdr->ip_version & 0xF);
256 }
257
258 static inline u8 sdp_get_majv(u8 sdp_version)
259 {
260 return sdp_version >> 4;
261 }
262
263 static inline u8 sdp_get_ip_ver(struct sdp_hh *hh)
264 {
265 return hh->ip_version >> 4;
266 }
267
268 static inline void sdp_set_ip_ver(struct sdp_hh *hh, u8 ip_ver)
269 {
270 hh->ip_version = (ip_ver << 4) | (hh->ip_version & 0xF);
271 }
272
273 static inline int cma_is_ud_ps(enum rdma_port_space ps)
274 {
275 return (ps == RDMA_PS_UDP || ps == RDMA_PS_IPOIB);
276 }
277
278 static void cma_attach_to_dev(struct rdma_id_private *id_priv,
279 struct cma_device *cma_dev)
280 {
281 atomic_inc(&cma_dev->refcount);
282 id_priv->cma_dev = cma_dev;
283 id_priv->id.device = cma_dev->device;
284 list_add_tail(&id_priv->list, &cma_dev->id_list);
285 }
286
287 static inline void cma_deref_dev(struct cma_device *cma_dev)
288 {
289 if (atomic_dec_and_test(&cma_dev->refcount))
290 complete(&cma_dev->comp);
291 }
292
293 static void cma_detach_from_dev(struct rdma_id_private *id_priv)
294 {
295 list_del(&id_priv->list);
296 cma_deref_dev(id_priv->cma_dev);
297 id_priv->cma_dev = NULL;
298 }
299
300 static int cma_set_qkey(struct rdma_id_private *id_priv)
301 {
302 struct ib_sa_mcmember_rec rec;
303 int ret = 0;
304
305 if (id_priv->qkey)
306 return 0;
307
308 switch (id_priv->id.ps) {
309 case RDMA_PS_UDP:
310 id_priv->qkey = RDMA_UDP_QKEY;
311 break;
312 case RDMA_PS_IPOIB:
313 ib_addr_get_mgid(&id_priv->id.route.addr.dev_addr, &rec.mgid);
314 ret = ib_sa_get_mcmember_rec(id_priv->id.device,
315 id_priv->id.port_num, &rec.mgid,
316 &rec);
317 if (!ret)
318 id_priv->qkey = be32_to_cpu(rec.qkey);
319 break;
320 default:
321 break;
322 }
323 return ret;
324 }
325
326 static int cma_acquire_dev(struct rdma_id_private *id_priv)
327 {
328 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
329 struct cma_device *cma_dev;
330 union ib_gid gid;
331 int ret = -ENODEV;
332
333 rdma_addr_get_sgid(dev_addr, &gid);
334 list_for_each_entry(cma_dev, &dev_list, list) {
335 ret = ib_find_cached_gid(cma_dev->device, &gid,
336 &id_priv->id.port_num, NULL);
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_callback(struct rdma_id_private *id_priv,
352 enum cma_state state)
353 {
354 mutex_lock(&id_priv->handler_mutex);
355 if (id_priv->state != state) {
356 mutex_unlock(&id_priv->handler_mutex);
357 return -EINVAL;
358 }
359 return 0;
360 }
361
362 static int cma_has_cm_dev(struct rdma_id_private *id_priv)
363 {
364 return (id_priv->id.device && id_priv->cm_id.ib);
365 }
366
367 struct rdma_cm_id *rdma_create_id(rdma_cm_event_handler event_handler,
368 void *context, enum rdma_port_space ps)
369 {
370 struct rdma_id_private *id_priv;
371
372 id_priv = kzalloc(sizeof *id_priv, GFP_KERNEL);
373 if (!id_priv)
374 return ERR_PTR(-ENOMEM);
375
376 id_priv->state = CMA_IDLE;
377 id_priv->id.context = context;
378 id_priv->id.event_handler = event_handler;
379 id_priv->id.ps = ps;
380 spin_lock_init(&id_priv->lock);
381 mutex_init(&id_priv->qp_mutex);
382 init_completion(&id_priv->comp);
383 atomic_set(&id_priv->refcount, 1);
384 mutex_init(&id_priv->handler_mutex);
385 INIT_LIST_HEAD(&id_priv->listen_list);
386 INIT_LIST_HEAD(&id_priv->mc_list);
387 get_random_bytes(&id_priv->seq_num, sizeof id_priv->seq_num);
388
389 return &id_priv->id;
390 }
391 EXPORT_SYMBOL(rdma_create_id);
392
393 static int cma_init_ud_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
394 {
395 struct ib_qp_attr qp_attr;
396 int qp_attr_mask, ret;
397
398 qp_attr.qp_state = IB_QPS_INIT;
399 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
400 if (ret)
401 return ret;
402
403 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
404 if (ret)
405 return ret;
406
407 qp_attr.qp_state = IB_QPS_RTR;
408 ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE);
409 if (ret)
410 return ret;
411
412 qp_attr.qp_state = IB_QPS_RTS;
413 qp_attr.sq_psn = 0;
414 ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE | IB_QP_SQ_PSN);
415
416 return ret;
417 }
418
419 static int cma_init_conn_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
420 {
421 struct ib_qp_attr qp_attr;
422 int qp_attr_mask, ret;
423
424 qp_attr.qp_state = IB_QPS_INIT;
425 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
426 if (ret)
427 return ret;
428
429 return ib_modify_qp(qp, &qp_attr, qp_attr_mask);
430 }
431
432 int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd,
433 struct ib_qp_init_attr *qp_init_attr)
434 {
435 struct rdma_id_private *id_priv;
436 struct ib_qp *qp;
437 int ret;
438
439 id_priv = container_of(id, struct rdma_id_private, id);
440 if (id->device != pd->device)
441 return -EINVAL;
442
443 qp = ib_create_qp(pd, qp_init_attr);
444 if (IS_ERR(qp))
445 return PTR_ERR(qp);
446
447 if (cma_is_ud_ps(id_priv->id.ps))
448 ret = cma_init_ud_qp(id_priv, qp);
449 else
450 ret = cma_init_conn_qp(id_priv, qp);
451 if (ret)
452 goto err;
453
454 id->qp = qp;
455 id_priv->qp_num = qp->qp_num;
456 id_priv->srq = (qp->srq != NULL);
457 return 0;
458 err:
459 ib_destroy_qp(qp);
460 return ret;
461 }
462 EXPORT_SYMBOL(rdma_create_qp);
463
464 void rdma_destroy_qp(struct rdma_cm_id *id)
465 {
466 struct rdma_id_private *id_priv;
467
468 id_priv = container_of(id, struct rdma_id_private, id);
469 mutex_lock(&id_priv->qp_mutex);
470 ib_destroy_qp(id_priv->id.qp);
471 id_priv->id.qp = NULL;
472 mutex_unlock(&id_priv->qp_mutex);
473 }
474 EXPORT_SYMBOL(rdma_destroy_qp);
475
476 static int cma_modify_qp_rtr(struct rdma_id_private *id_priv,
477 struct rdma_conn_param *conn_param)
478 {
479 struct ib_qp_attr qp_attr;
480 int qp_attr_mask, ret;
481
482 mutex_lock(&id_priv->qp_mutex);
483 if (!id_priv->id.qp) {
484 ret = 0;
485 goto out;
486 }
487
488 /* Need to update QP attributes from default values. */
489 qp_attr.qp_state = IB_QPS_INIT;
490 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
491 if (ret)
492 goto out;
493
494 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
495 if (ret)
496 goto out;
497
498 qp_attr.qp_state = IB_QPS_RTR;
499 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
500 if (ret)
501 goto out;
502
503 if (conn_param)
504 qp_attr.max_dest_rd_atomic = conn_param->responder_resources;
505 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
506 out:
507 mutex_unlock(&id_priv->qp_mutex);
508 return ret;
509 }
510
511 static int cma_modify_qp_rts(struct rdma_id_private *id_priv,
512 struct rdma_conn_param *conn_param)
513 {
514 struct ib_qp_attr qp_attr;
515 int qp_attr_mask, ret;
516
517 mutex_lock(&id_priv->qp_mutex);
518 if (!id_priv->id.qp) {
519 ret = 0;
520 goto out;
521 }
522
523 qp_attr.qp_state = IB_QPS_RTS;
524 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
525 if (ret)
526 goto out;
527
528 if (conn_param)
529 qp_attr.max_rd_atomic = conn_param->initiator_depth;
530 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
531 out:
532 mutex_unlock(&id_priv->qp_mutex);
533 return ret;
534 }
535
536 static int cma_modify_qp_err(struct rdma_id_private *id_priv)
537 {
538 struct ib_qp_attr qp_attr;
539 int ret;
540
541 mutex_lock(&id_priv->qp_mutex);
542 if (!id_priv->id.qp) {
543 ret = 0;
544 goto out;
545 }
546
547 qp_attr.qp_state = IB_QPS_ERR;
548 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, IB_QP_STATE);
549 out:
550 mutex_unlock(&id_priv->qp_mutex);
551 return ret;
552 }
553
554 static int cma_ib_init_qp_attr(struct rdma_id_private *id_priv,
555 struct ib_qp_attr *qp_attr, int *qp_attr_mask)
556 {
557 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
558 int ret;
559
560 ret = ib_find_cached_pkey(id_priv->id.device, id_priv->id.port_num,
561 ib_addr_get_pkey(dev_addr),
562 &qp_attr->pkey_index);
563 if (ret)
564 return ret;
565
566 qp_attr->port_num = id_priv->id.port_num;
567 *qp_attr_mask = IB_QP_STATE | IB_QP_PKEY_INDEX | IB_QP_PORT;
568
569 if (cma_is_ud_ps(id_priv->id.ps)) {
570 ret = cma_set_qkey(id_priv);
571 if (ret)
572 return ret;
573
574 qp_attr->qkey = id_priv->qkey;
575 *qp_attr_mask |= IB_QP_QKEY;
576 } else {
577 qp_attr->qp_access_flags = 0;
578 *qp_attr_mask |= IB_QP_ACCESS_FLAGS;
579 }
580 return 0;
581 }
582
583 int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
584 int *qp_attr_mask)
585 {
586 struct rdma_id_private *id_priv;
587 int ret = 0;
588
589 id_priv = container_of(id, struct rdma_id_private, id);
590 switch (rdma_node_get_transport(id_priv->id.device->node_type)) {
591 case RDMA_TRANSPORT_IB:
592 if (!id_priv->cm_id.ib || cma_is_ud_ps(id_priv->id.ps))
593 ret = cma_ib_init_qp_attr(id_priv, qp_attr, qp_attr_mask);
594 else
595 ret = ib_cm_init_qp_attr(id_priv->cm_id.ib, qp_attr,
596 qp_attr_mask);
597 if (qp_attr->qp_state == IB_QPS_RTR)
598 qp_attr->rq_psn = id_priv->seq_num;
599 break;
600 case RDMA_TRANSPORT_IWARP:
601 if (!id_priv->cm_id.iw) {
602 qp_attr->qp_access_flags = 0;
603 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS;
604 } else
605 ret = iw_cm_init_qp_attr(id_priv->cm_id.iw, qp_attr,
606 qp_attr_mask);
607 break;
608 default:
609 ret = -ENOSYS;
610 break;
611 }
612
613 return ret;
614 }
615 EXPORT_SYMBOL(rdma_init_qp_attr);
616
617 static inline int cma_zero_addr(struct sockaddr *addr)
618 {
619 struct in6_addr *ip6;
620
621 if (addr->sa_family == AF_INET)
622 return ipv4_is_zeronet(
623 ((struct sockaddr_in *)addr)->sin_addr.s_addr);
624 else {
625 ip6 = &((struct sockaddr_in6 *) addr)->sin6_addr;
626 return (ip6->s6_addr32[0] | ip6->s6_addr32[1] |
627 ip6->s6_addr32[2] | ip6->s6_addr32[3]) == 0;
628 }
629 }
630
631 static inline int cma_loopback_addr(struct sockaddr *addr)
632 {
633 if (addr->sa_family == AF_INET)
634 return ipv4_is_loopback(
635 ((struct sockaddr_in *) addr)->sin_addr.s_addr);
636 else
637 return ipv6_addr_loopback(
638 &((struct sockaddr_in6 *) addr)->sin6_addr);
639 }
640
641 static inline int cma_any_addr(struct sockaddr *addr)
642 {
643 return cma_zero_addr(addr) || cma_loopback_addr(addr);
644 }
645
646 static inline __be16 cma_port(struct sockaddr *addr)
647 {
648 if (addr->sa_family == AF_INET)
649 return ((struct sockaddr_in *) addr)->sin_port;
650 else
651 return ((struct sockaddr_in6 *) addr)->sin6_port;
652 }
653
654 static inline int cma_any_port(struct sockaddr *addr)
655 {
656 return !cma_port(addr);
657 }
658
659 static int cma_get_net_info(void *hdr, enum rdma_port_space ps,
660 u8 *ip_ver, __be16 *port,
661 union cma_ip_addr **src, union cma_ip_addr **dst)
662 {
663 switch (ps) {
664 case RDMA_PS_SDP:
665 if (sdp_get_majv(((struct sdp_hh *) hdr)->sdp_version) !=
666 SDP_MAJ_VERSION)
667 return -EINVAL;
668
669 *ip_ver = sdp_get_ip_ver(hdr);
670 *port = ((struct sdp_hh *) hdr)->port;
671 *src = &((struct sdp_hh *) hdr)->src_addr;
672 *dst = &((struct sdp_hh *) hdr)->dst_addr;
673 break;
674 default:
675 if (((struct cma_hdr *) hdr)->cma_version != CMA_VERSION)
676 return -EINVAL;
677
678 *ip_ver = cma_get_ip_ver(hdr);
679 *port = ((struct cma_hdr *) hdr)->port;
680 *src = &((struct cma_hdr *) hdr)->src_addr;
681 *dst = &((struct cma_hdr *) hdr)->dst_addr;
682 break;
683 }
684
685 if (*ip_ver != 4 && *ip_ver != 6)
686 return -EINVAL;
687 return 0;
688 }
689
690 static void cma_save_net_info(struct rdma_addr *addr,
691 struct rdma_addr *listen_addr,
692 u8 ip_ver, __be16 port,
693 union cma_ip_addr *src, union cma_ip_addr *dst)
694 {
695 struct sockaddr_in *listen4, *ip4;
696 struct sockaddr_in6 *listen6, *ip6;
697
698 switch (ip_ver) {
699 case 4:
700 listen4 = (struct sockaddr_in *) &listen_addr->src_addr;
701 ip4 = (struct sockaddr_in *) &addr->src_addr;
702 ip4->sin_family = listen4->sin_family;
703 ip4->sin_addr.s_addr = dst->ip4.addr;
704 ip4->sin_port = listen4->sin_port;
705
706 ip4 = (struct sockaddr_in *) &addr->dst_addr;
707 ip4->sin_family = listen4->sin_family;
708 ip4->sin_addr.s_addr = src->ip4.addr;
709 ip4->sin_port = port;
710 break;
711 case 6:
712 listen6 = (struct sockaddr_in6 *) &listen_addr->src_addr;
713 ip6 = (struct sockaddr_in6 *) &addr->src_addr;
714 ip6->sin6_family = listen6->sin6_family;
715 ip6->sin6_addr = dst->ip6;
716 ip6->sin6_port = listen6->sin6_port;
717
718 ip6 = (struct sockaddr_in6 *) &addr->dst_addr;
719 ip6->sin6_family = listen6->sin6_family;
720 ip6->sin6_addr = src->ip6;
721 ip6->sin6_port = port;
722 break;
723 default:
724 break;
725 }
726 }
727
728 static inline int cma_user_data_offset(enum rdma_port_space ps)
729 {
730 switch (ps) {
731 case RDMA_PS_SDP:
732 return 0;
733 default:
734 return sizeof(struct cma_hdr);
735 }
736 }
737
738 static void cma_cancel_route(struct rdma_id_private *id_priv)
739 {
740 switch (rdma_node_get_transport(id_priv->id.device->node_type)) {
741 case RDMA_TRANSPORT_IB:
742 if (id_priv->query)
743 ib_sa_cancel_query(id_priv->query_id, id_priv->query);
744 break;
745 default:
746 break;
747 }
748 }
749
750 static void cma_cancel_listens(struct rdma_id_private *id_priv)
751 {
752 struct rdma_id_private *dev_id_priv;
753
754 /*
755 * Remove from listen_any_list to prevent added devices from spawning
756 * additional listen requests.
757 */
758 mutex_lock(&lock);
759 list_del(&id_priv->list);
760
761 while (!list_empty(&id_priv->listen_list)) {
762 dev_id_priv = list_entry(id_priv->listen_list.next,
763 struct rdma_id_private, listen_list);
764 /* sync with device removal to avoid duplicate destruction */
765 list_del_init(&dev_id_priv->list);
766 list_del(&dev_id_priv->listen_list);
767 mutex_unlock(&lock);
768
769 rdma_destroy_id(&dev_id_priv->id);
770 mutex_lock(&lock);
771 }
772 mutex_unlock(&lock);
773 }
774
775 static void cma_cancel_operation(struct rdma_id_private *id_priv,
776 enum cma_state state)
777 {
778 switch (state) {
779 case CMA_ADDR_QUERY:
780 rdma_addr_cancel(&id_priv->id.route.addr.dev_addr);
781 break;
782 case CMA_ROUTE_QUERY:
783 cma_cancel_route(id_priv);
784 break;
785 case CMA_LISTEN:
786 if (cma_any_addr((struct sockaddr *) &id_priv->id.route.addr.src_addr)
787 && !id_priv->cma_dev)
788 cma_cancel_listens(id_priv);
789 break;
790 default:
791 break;
792 }
793 }
794
795 static void cma_release_port(struct rdma_id_private *id_priv)
796 {
797 struct rdma_bind_list *bind_list = id_priv->bind_list;
798
799 if (!bind_list)
800 return;
801
802 mutex_lock(&lock);
803 hlist_del(&id_priv->node);
804 if (hlist_empty(&bind_list->owners)) {
805 idr_remove(bind_list->ps, bind_list->port);
806 kfree(bind_list);
807 }
808 mutex_unlock(&lock);
809 }
810
811 static void cma_leave_mc_groups(struct rdma_id_private *id_priv)
812 {
813 struct cma_multicast *mc;
814
815 while (!list_empty(&id_priv->mc_list)) {
816 mc = container_of(id_priv->mc_list.next,
817 struct cma_multicast, list);
818 list_del(&mc->list);
819 ib_sa_free_multicast(mc->multicast.ib);
820 kfree(mc);
821 }
822 }
823
824 void rdma_destroy_id(struct rdma_cm_id *id)
825 {
826 struct rdma_id_private *id_priv;
827 enum cma_state state;
828
829 id_priv = container_of(id, struct rdma_id_private, id);
830 state = cma_exch(id_priv, CMA_DESTROYING);
831 cma_cancel_operation(id_priv, state);
832
833 mutex_lock(&lock);
834 if (id_priv->cma_dev) {
835 mutex_unlock(&lock);
836 switch (rdma_node_get_transport(id->device->node_type)) {
837 case RDMA_TRANSPORT_IB:
838 if (id_priv->cm_id.ib && !IS_ERR(id_priv->cm_id.ib))
839 ib_destroy_cm_id(id_priv->cm_id.ib);
840 break;
841 case RDMA_TRANSPORT_IWARP:
842 if (id_priv->cm_id.iw && !IS_ERR(id_priv->cm_id.iw))
843 iw_destroy_cm_id(id_priv->cm_id.iw);
844 break;
845 default:
846 break;
847 }
848 cma_leave_mc_groups(id_priv);
849 mutex_lock(&lock);
850 cma_detach_from_dev(id_priv);
851 }
852 mutex_unlock(&lock);
853
854 cma_release_port(id_priv);
855 cma_deref_id(id_priv);
856 wait_for_completion(&id_priv->comp);
857
858 if (id_priv->internal_id)
859 cma_deref_id(id_priv->id.context);
860
861 kfree(id_priv->id.route.path_rec);
862 kfree(id_priv);
863 }
864 EXPORT_SYMBOL(rdma_destroy_id);
865
866 static int cma_rep_recv(struct rdma_id_private *id_priv)
867 {
868 int ret;
869
870 ret = cma_modify_qp_rtr(id_priv, NULL);
871 if (ret)
872 goto reject;
873
874 ret = cma_modify_qp_rts(id_priv, NULL);
875 if (ret)
876 goto reject;
877
878 ret = ib_send_cm_rtu(id_priv->cm_id.ib, NULL, 0);
879 if (ret)
880 goto reject;
881
882 return 0;
883 reject:
884 cma_modify_qp_err(id_priv);
885 ib_send_cm_rej(id_priv->cm_id.ib, IB_CM_REJ_CONSUMER_DEFINED,
886 NULL, 0, NULL, 0);
887 return ret;
888 }
889
890 static int cma_verify_rep(struct rdma_id_private *id_priv, void *data)
891 {
892 if (id_priv->id.ps == RDMA_PS_SDP &&
893 sdp_get_majv(((struct sdp_hah *) data)->sdp_version) !=
894 SDP_MAJ_VERSION)
895 return -EINVAL;
896
897 return 0;
898 }
899
900 static void cma_set_rep_event_data(struct rdma_cm_event *event,
901 struct ib_cm_rep_event_param *rep_data,
902 void *private_data)
903 {
904 event->param.conn.private_data = private_data;
905 event->param.conn.private_data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
906 event->param.conn.responder_resources = rep_data->responder_resources;
907 event->param.conn.initiator_depth = rep_data->initiator_depth;
908 event->param.conn.flow_control = rep_data->flow_control;
909 event->param.conn.rnr_retry_count = rep_data->rnr_retry_count;
910 event->param.conn.srq = rep_data->srq;
911 event->param.conn.qp_num = rep_data->remote_qpn;
912 }
913
914 static int cma_ib_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
915 {
916 struct rdma_id_private *id_priv = cm_id->context;
917 struct rdma_cm_event event;
918 int ret = 0;
919
920 if ((ib_event->event != IB_CM_TIMEWAIT_EXIT &&
921 cma_disable_callback(id_priv, CMA_CONNECT)) ||
922 (ib_event->event == IB_CM_TIMEWAIT_EXIT &&
923 cma_disable_callback(id_priv, CMA_DISCONNECT)))
924 return 0;
925
926 memset(&event, 0, sizeof event);
927 switch (ib_event->event) {
928 case IB_CM_REQ_ERROR:
929 case IB_CM_REP_ERROR:
930 event.event = RDMA_CM_EVENT_UNREACHABLE;
931 event.status = -ETIMEDOUT;
932 break;
933 case IB_CM_REP_RECEIVED:
934 event.status = cma_verify_rep(id_priv, ib_event->private_data);
935 if (event.status)
936 event.event = RDMA_CM_EVENT_CONNECT_ERROR;
937 else if (id_priv->id.qp && id_priv->id.ps != RDMA_PS_SDP) {
938 event.status = cma_rep_recv(id_priv);
939 event.event = event.status ? RDMA_CM_EVENT_CONNECT_ERROR :
940 RDMA_CM_EVENT_ESTABLISHED;
941 } else
942 event.event = RDMA_CM_EVENT_CONNECT_RESPONSE;
943 cma_set_rep_event_data(&event, &ib_event->param.rep_rcvd,
944 ib_event->private_data);
945 break;
946 case IB_CM_RTU_RECEIVED:
947 case IB_CM_USER_ESTABLISHED:
948 event.event = RDMA_CM_EVENT_ESTABLISHED;
949 break;
950 case IB_CM_DREQ_ERROR:
951 event.status = -ETIMEDOUT; /* fall through */
952 case IB_CM_DREQ_RECEIVED:
953 case IB_CM_DREP_RECEIVED:
954 if (!cma_comp_exch(id_priv, CMA_CONNECT, CMA_DISCONNECT))
955 goto out;
956 event.event = RDMA_CM_EVENT_DISCONNECTED;
957 break;
958 case IB_CM_TIMEWAIT_EXIT:
959 event.event = RDMA_CM_EVENT_TIMEWAIT_EXIT;
960 break;
961 case IB_CM_MRA_RECEIVED:
962 /* ignore event */
963 goto out;
964 case IB_CM_REJ_RECEIVED:
965 cma_modify_qp_err(id_priv);
966 event.status = ib_event->param.rej_rcvd.reason;
967 event.event = RDMA_CM_EVENT_REJECTED;
968 event.param.conn.private_data = ib_event->private_data;
969 event.param.conn.private_data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
970 break;
971 default:
972 printk(KERN_ERR "RDMA CMA: unexpected IB CM event: %d\n",
973 ib_event->event);
974 goto out;
975 }
976
977 ret = id_priv->id.event_handler(&id_priv->id, &event);
978 if (ret) {
979 /* Destroy the CM ID by returning a non-zero value. */
980 id_priv->cm_id.ib = NULL;
981 cma_exch(id_priv, CMA_DESTROYING);
982 mutex_unlock(&id_priv->handler_mutex);
983 rdma_destroy_id(&id_priv->id);
984 return ret;
985 }
986 out:
987 mutex_unlock(&id_priv->handler_mutex);
988 return ret;
989 }
990
991 static struct rdma_id_private *cma_new_conn_id(struct rdma_cm_id *listen_id,
992 struct ib_cm_event *ib_event)
993 {
994 struct rdma_id_private *id_priv;
995 struct rdma_cm_id *id;
996 struct rdma_route *rt;
997 union cma_ip_addr *src, *dst;
998 __be16 port;
999 u8 ip_ver;
1000 int ret;
1001
1002 if (cma_get_net_info(ib_event->private_data, listen_id->ps,
1003 &ip_ver, &port, &src, &dst))
1004 goto err;
1005
1006 id = rdma_create_id(listen_id->event_handler, listen_id->context,
1007 listen_id->ps);
1008 if (IS_ERR(id))
1009 goto err;
1010
1011 cma_save_net_info(&id->route.addr, &listen_id->route.addr,
1012 ip_ver, port, src, dst);
1013
1014 rt = &id->route;
1015 rt->num_paths = ib_event->param.req_rcvd.alternate_path ? 2 : 1;
1016 rt->path_rec = kmalloc(sizeof *rt->path_rec * rt->num_paths,
1017 GFP_KERNEL);
1018 if (!rt->path_rec)
1019 goto destroy_id;
1020
1021 rt->path_rec[0] = *ib_event->param.req_rcvd.primary_path;
1022 if (rt->num_paths == 2)
1023 rt->path_rec[1] = *ib_event->param.req_rcvd.alternate_path;
1024
1025 if (cma_any_addr((struct sockaddr *) &rt->addr.src_addr)) {
1026 rt->addr.dev_addr.dev_type = ARPHRD_INFINIBAND;
1027 rdma_addr_set_sgid(&rt->addr.dev_addr, &rt->path_rec[0].sgid);
1028 ib_addr_set_pkey(&rt->addr.dev_addr, rt->path_rec[0].pkey);
1029 } else {
1030 ret = rdma_translate_ip((struct sockaddr *) &rt->addr.src_addr,
1031 &rt->addr.dev_addr);
1032 if (ret)
1033 goto destroy_id;
1034 }
1035 rdma_addr_set_dgid(&rt->addr.dev_addr, &rt->path_rec[0].dgid);
1036
1037 id_priv = container_of(id, struct rdma_id_private, id);
1038 id_priv->state = CMA_CONNECT;
1039 return id_priv;
1040
1041 destroy_id:
1042 rdma_destroy_id(id);
1043 err:
1044 return NULL;
1045 }
1046
1047 static struct rdma_id_private *cma_new_udp_id(struct rdma_cm_id *listen_id,
1048 struct ib_cm_event *ib_event)
1049 {
1050 struct rdma_id_private *id_priv;
1051 struct rdma_cm_id *id;
1052 union cma_ip_addr *src, *dst;
1053 __be16 port;
1054 u8 ip_ver;
1055 int ret;
1056
1057 id = rdma_create_id(listen_id->event_handler, listen_id->context,
1058 listen_id->ps);
1059 if (IS_ERR(id))
1060 return NULL;
1061
1062
1063 if (cma_get_net_info(ib_event->private_data, listen_id->ps,
1064 &ip_ver, &port, &src, &dst))
1065 goto err;
1066
1067 cma_save_net_info(&id->route.addr, &listen_id->route.addr,
1068 ip_ver, port, src, dst);
1069
1070 if (!cma_any_addr((struct sockaddr *) &id->route.addr.src_addr)) {
1071 ret = rdma_translate_ip((struct sockaddr *) &id->route.addr.src_addr,
1072 &id->route.addr.dev_addr);
1073 if (ret)
1074 goto err;
1075 }
1076
1077 id_priv = container_of(id, struct rdma_id_private, id);
1078 id_priv->state = CMA_CONNECT;
1079 return id_priv;
1080 err:
1081 rdma_destroy_id(id);
1082 return NULL;
1083 }
1084
1085 static void cma_set_req_event_data(struct rdma_cm_event *event,
1086 struct ib_cm_req_event_param *req_data,
1087 void *private_data, int offset)
1088 {
1089 event->param.conn.private_data = private_data + offset;
1090 event->param.conn.private_data_len = IB_CM_REQ_PRIVATE_DATA_SIZE - offset;
1091 event->param.conn.responder_resources = req_data->responder_resources;
1092 event->param.conn.initiator_depth = req_data->initiator_depth;
1093 event->param.conn.flow_control = req_data->flow_control;
1094 event->param.conn.retry_count = req_data->retry_count;
1095 event->param.conn.rnr_retry_count = req_data->rnr_retry_count;
1096 event->param.conn.srq = req_data->srq;
1097 event->param.conn.qp_num = req_data->remote_qpn;
1098 }
1099
1100 static int cma_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
1101 {
1102 struct rdma_id_private *listen_id, *conn_id;
1103 struct rdma_cm_event event;
1104 int offset, ret;
1105
1106 listen_id = cm_id->context;
1107 if (cma_disable_callback(listen_id, CMA_LISTEN))
1108 return -ECONNABORTED;
1109
1110 memset(&event, 0, sizeof event);
1111 offset = cma_user_data_offset(listen_id->id.ps);
1112 event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
1113 if (cma_is_ud_ps(listen_id->id.ps)) {
1114 conn_id = cma_new_udp_id(&listen_id->id, ib_event);
1115 event.param.ud.private_data = ib_event->private_data + offset;
1116 event.param.ud.private_data_len =
1117 IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE - offset;
1118 } else {
1119 conn_id = cma_new_conn_id(&listen_id->id, ib_event);
1120 cma_set_req_event_data(&event, &ib_event->param.req_rcvd,
1121 ib_event->private_data, offset);
1122 }
1123 if (!conn_id) {
1124 ret = -ENOMEM;
1125 goto out;
1126 }
1127
1128 mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
1129 mutex_lock(&lock);
1130 ret = cma_acquire_dev(conn_id);
1131 mutex_unlock(&lock);
1132 if (ret)
1133 goto release_conn_id;
1134
1135 conn_id->cm_id.ib = cm_id;
1136 cm_id->context = conn_id;
1137 cm_id->cm_handler = cma_ib_handler;
1138
1139 ret = conn_id->id.event_handler(&conn_id->id, &event);
1140 if (!ret) {
1141 /*
1142 * Acquire mutex to prevent user executing rdma_destroy_id()
1143 * while we're accessing the cm_id.
1144 */
1145 mutex_lock(&lock);
1146 if (cma_comp(conn_id, CMA_CONNECT) &&
1147 !cma_is_ud_ps(conn_id->id.ps))
1148 ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0);
1149 mutex_unlock(&lock);
1150 mutex_unlock(&conn_id->handler_mutex);
1151 goto out;
1152 }
1153
1154 /* Destroy the CM ID by returning a non-zero value. */
1155 conn_id->cm_id.ib = NULL;
1156
1157 release_conn_id:
1158 cma_exch(conn_id, CMA_DESTROYING);
1159 mutex_unlock(&conn_id->handler_mutex);
1160 rdma_destroy_id(&conn_id->id);
1161
1162 out:
1163 mutex_unlock(&listen_id->handler_mutex);
1164 return ret;
1165 }
1166
1167 static __be64 cma_get_service_id(enum rdma_port_space ps, struct sockaddr *addr)
1168 {
1169 return cpu_to_be64(((u64)ps << 16) + be16_to_cpu(cma_port(addr)));
1170 }
1171
1172 static void cma_set_compare_data(enum rdma_port_space ps, struct sockaddr *addr,
1173 struct ib_cm_compare_data *compare)
1174 {
1175 struct cma_hdr *cma_data, *cma_mask;
1176 struct sdp_hh *sdp_data, *sdp_mask;
1177 __be32 ip4_addr;
1178 struct in6_addr ip6_addr;
1179
1180 memset(compare, 0, sizeof *compare);
1181 cma_data = (void *) compare->data;
1182 cma_mask = (void *) compare->mask;
1183 sdp_data = (void *) compare->data;
1184 sdp_mask = (void *) compare->mask;
1185
1186 switch (addr->sa_family) {
1187 case AF_INET:
1188 ip4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
1189 if (ps == RDMA_PS_SDP) {
1190 sdp_set_ip_ver(sdp_data, 4);
1191 sdp_set_ip_ver(sdp_mask, 0xF);
1192 sdp_data->dst_addr.ip4.addr = ip4_addr;
1193 sdp_mask->dst_addr.ip4.addr = htonl(~0);
1194 } else {
1195 cma_set_ip_ver(cma_data, 4);
1196 cma_set_ip_ver(cma_mask, 0xF);
1197 cma_data->dst_addr.ip4.addr = ip4_addr;
1198 cma_mask->dst_addr.ip4.addr = htonl(~0);
1199 }
1200 break;
1201 case AF_INET6:
1202 ip6_addr = ((struct sockaddr_in6 *) addr)->sin6_addr;
1203 if (ps == RDMA_PS_SDP) {
1204 sdp_set_ip_ver(sdp_data, 6);
1205 sdp_set_ip_ver(sdp_mask, 0xF);
1206 sdp_data->dst_addr.ip6 = ip6_addr;
1207 memset(&sdp_mask->dst_addr.ip6, 0xFF,
1208 sizeof sdp_mask->dst_addr.ip6);
1209 } else {
1210 cma_set_ip_ver(cma_data, 6);
1211 cma_set_ip_ver(cma_mask, 0xF);
1212 cma_data->dst_addr.ip6 = ip6_addr;
1213 memset(&cma_mask->dst_addr.ip6, 0xFF,
1214 sizeof cma_mask->dst_addr.ip6);
1215 }
1216 break;
1217 default:
1218 break;
1219 }
1220 }
1221
1222 static int cma_iw_handler(struct iw_cm_id *iw_id, struct iw_cm_event *iw_event)
1223 {
1224 struct rdma_id_private *id_priv = iw_id->context;
1225 struct rdma_cm_event event;
1226 struct sockaddr_in *sin;
1227 int ret = 0;
1228
1229 if (cma_disable_callback(id_priv, CMA_CONNECT))
1230 return 0;
1231
1232 memset(&event, 0, sizeof event);
1233 switch (iw_event->event) {
1234 case IW_CM_EVENT_CLOSE:
1235 event.event = RDMA_CM_EVENT_DISCONNECTED;
1236 break;
1237 case IW_CM_EVENT_CONNECT_REPLY:
1238 sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
1239 *sin = iw_event->local_addr;
1240 sin = (struct sockaddr_in *) &id_priv->id.route.addr.dst_addr;
1241 *sin = iw_event->remote_addr;
1242 switch (iw_event->status) {
1243 case 0:
1244 event.event = RDMA_CM_EVENT_ESTABLISHED;
1245 break;
1246 case -ECONNRESET:
1247 case -ECONNREFUSED:
1248 event.event = RDMA_CM_EVENT_REJECTED;
1249 break;
1250 case -ETIMEDOUT:
1251 event.event = RDMA_CM_EVENT_UNREACHABLE;
1252 break;
1253 default:
1254 event.event = RDMA_CM_EVENT_CONNECT_ERROR;
1255 break;
1256 }
1257 break;
1258 case IW_CM_EVENT_ESTABLISHED:
1259 event.event = RDMA_CM_EVENT_ESTABLISHED;
1260 break;
1261 default:
1262 BUG_ON(1);
1263 }
1264
1265 event.status = iw_event->status;
1266 event.param.conn.private_data = iw_event->private_data;
1267 event.param.conn.private_data_len = iw_event->private_data_len;
1268 ret = id_priv->id.event_handler(&id_priv->id, &event);
1269 if (ret) {
1270 /* Destroy the CM ID by returning a non-zero value. */
1271 id_priv->cm_id.iw = NULL;
1272 cma_exch(id_priv, CMA_DESTROYING);
1273 mutex_unlock(&id_priv->handler_mutex);
1274 rdma_destroy_id(&id_priv->id);
1275 return ret;
1276 }
1277
1278 mutex_unlock(&id_priv->handler_mutex);
1279 return ret;
1280 }
1281
1282 static int iw_conn_req_handler(struct iw_cm_id *cm_id,
1283 struct iw_cm_event *iw_event)
1284 {
1285 struct rdma_cm_id *new_cm_id;
1286 struct rdma_id_private *listen_id, *conn_id;
1287 struct sockaddr_in *sin;
1288 struct net_device *dev = NULL;
1289 struct rdma_cm_event event;
1290 int ret;
1291 struct ib_device_attr attr;
1292
1293 listen_id = cm_id->context;
1294 if (cma_disable_callback(listen_id, CMA_LISTEN))
1295 return -ECONNABORTED;
1296
1297 /* Create a new RDMA id for the new IW CM ID */
1298 new_cm_id = rdma_create_id(listen_id->id.event_handler,
1299 listen_id->id.context,
1300 RDMA_PS_TCP);
1301 if (IS_ERR(new_cm_id)) {
1302 ret = -ENOMEM;
1303 goto out;
1304 }
1305 conn_id = container_of(new_cm_id, struct rdma_id_private, id);
1306 mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
1307 conn_id->state = CMA_CONNECT;
1308
1309 dev = ip_dev_find(&init_net, iw_event->local_addr.sin_addr.s_addr);
1310 if (!dev) {
1311 ret = -EADDRNOTAVAIL;
1312 mutex_unlock(&conn_id->handler_mutex);
1313 rdma_destroy_id(new_cm_id);
1314 goto out;
1315 }
1316 ret = rdma_copy_addr(&conn_id->id.route.addr.dev_addr, dev, NULL);
1317 if (ret) {
1318 mutex_unlock(&conn_id->handler_mutex);
1319 rdma_destroy_id(new_cm_id);
1320 goto out;
1321 }
1322
1323 mutex_lock(&lock);
1324 ret = cma_acquire_dev(conn_id);
1325 mutex_unlock(&lock);
1326 if (ret) {
1327 mutex_unlock(&conn_id->handler_mutex);
1328 rdma_destroy_id(new_cm_id);
1329 goto out;
1330 }
1331
1332 conn_id->cm_id.iw = cm_id;
1333 cm_id->context = conn_id;
1334 cm_id->cm_handler = cma_iw_handler;
1335
1336 sin = (struct sockaddr_in *) &new_cm_id->route.addr.src_addr;
1337 *sin = iw_event->local_addr;
1338 sin = (struct sockaddr_in *) &new_cm_id->route.addr.dst_addr;
1339 *sin = iw_event->remote_addr;
1340
1341 ret = ib_query_device(conn_id->id.device, &attr);
1342 if (ret) {
1343 mutex_unlock(&conn_id->handler_mutex);
1344 rdma_destroy_id(new_cm_id);
1345 goto out;
1346 }
1347
1348 memset(&event, 0, sizeof event);
1349 event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
1350 event.param.conn.private_data = iw_event->private_data;
1351 event.param.conn.private_data_len = iw_event->private_data_len;
1352 event.param.conn.initiator_depth = attr.max_qp_init_rd_atom;
1353 event.param.conn.responder_resources = attr.max_qp_rd_atom;
1354 ret = conn_id->id.event_handler(&conn_id->id, &event);
1355 if (ret) {
1356 /* User wants to destroy the CM ID */
1357 conn_id->cm_id.iw = NULL;
1358 cma_exch(conn_id, CMA_DESTROYING);
1359 mutex_unlock(&conn_id->handler_mutex);
1360 rdma_destroy_id(&conn_id->id);
1361 goto out;
1362 }
1363
1364 mutex_unlock(&conn_id->handler_mutex);
1365
1366 out:
1367 if (dev)
1368 dev_put(dev);
1369 mutex_unlock(&listen_id->handler_mutex);
1370 return ret;
1371 }
1372
1373 static int cma_ib_listen(struct rdma_id_private *id_priv)
1374 {
1375 struct ib_cm_compare_data compare_data;
1376 struct sockaddr *addr;
1377 __be64 svc_id;
1378 int ret;
1379
1380 id_priv->cm_id.ib = ib_create_cm_id(id_priv->id.device, cma_req_handler,
1381 id_priv);
1382 if (IS_ERR(id_priv->cm_id.ib))
1383 return PTR_ERR(id_priv->cm_id.ib);
1384
1385 addr = (struct sockaddr *) &id_priv->id.route.addr.src_addr;
1386 svc_id = cma_get_service_id(id_priv->id.ps, addr);
1387 if (cma_any_addr(addr))
1388 ret = ib_cm_listen(id_priv->cm_id.ib, svc_id, 0, NULL);
1389 else {
1390 cma_set_compare_data(id_priv->id.ps, addr, &compare_data);
1391 ret = ib_cm_listen(id_priv->cm_id.ib, svc_id, 0, &compare_data);
1392 }
1393
1394 if (ret) {
1395 ib_destroy_cm_id(id_priv->cm_id.ib);
1396 id_priv->cm_id.ib = NULL;
1397 }
1398
1399 return ret;
1400 }
1401
1402 static int cma_iw_listen(struct rdma_id_private *id_priv, int backlog)
1403 {
1404 int ret;
1405 struct sockaddr_in *sin;
1406
1407 id_priv->cm_id.iw = iw_create_cm_id(id_priv->id.device,
1408 iw_conn_req_handler,
1409 id_priv);
1410 if (IS_ERR(id_priv->cm_id.iw))
1411 return PTR_ERR(id_priv->cm_id.iw);
1412
1413 sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
1414 id_priv->cm_id.iw->local_addr = *sin;
1415
1416 ret = iw_cm_listen(id_priv->cm_id.iw, backlog);
1417
1418 if (ret) {
1419 iw_destroy_cm_id(id_priv->cm_id.iw);
1420 id_priv->cm_id.iw = NULL;
1421 }
1422
1423 return ret;
1424 }
1425
1426 static int cma_listen_handler(struct rdma_cm_id *id,
1427 struct rdma_cm_event *event)
1428 {
1429 struct rdma_id_private *id_priv = id->context;
1430
1431 id->context = id_priv->id.context;
1432 id->event_handler = id_priv->id.event_handler;
1433 return id_priv->id.event_handler(id, event);
1434 }
1435
1436 static void cma_listen_on_dev(struct rdma_id_private *id_priv,
1437 struct cma_device *cma_dev)
1438 {
1439 struct rdma_id_private *dev_id_priv;
1440 struct rdma_cm_id *id;
1441 int ret;
1442
1443 id = rdma_create_id(cma_listen_handler, id_priv, id_priv->id.ps);
1444 if (IS_ERR(id))
1445 return;
1446
1447 dev_id_priv = container_of(id, struct rdma_id_private, id);
1448
1449 dev_id_priv->state = CMA_ADDR_BOUND;
1450 memcpy(&id->route.addr.src_addr, &id_priv->id.route.addr.src_addr,
1451 ip_addr_size((struct sockaddr *) &id_priv->id.route.addr.src_addr));
1452
1453 cma_attach_to_dev(dev_id_priv, cma_dev);
1454 list_add_tail(&dev_id_priv->listen_list, &id_priv->listen_list);
1455 atomic_inc(&id_priv->refcount);
1456 dev_id_priv->internal_id = 1;
1457
1458 ret = rdma_listen(id, id_priv->backlog);
1459 if (ret)
1460 printk(KERN_WARNING "RDMA CMA: cma_listen_on_dev, error %d, "
1461 "listening on device %s\n", ret, cma_dev->device->name);
1462 }
1463
1464 static void cma_listen_on_all(struct rdma_id_private *id_priv)
1465 {
1466 struct cma_device *cma_dev;
1467
1468 mutex_lock(&lock);
1469 list_add_tail(&id_priv->list, &listen_any_list);
1470 list_for_each_entry(cma_dev, &dev_list, list)
1471 cma_listen_on_dev(id_priv, cma_dev);
1472 mutex_unlock(&lock);
1473 }
1474
1475 int rdma_listen(struct rdma_cm_id *id, int backlog)
1476 {
1477 struct rdma_id_private *id_priv;
1478 int ret;
1479
1480 id_priv = container_of(id, struct rdma_id_private, id);
1481 if (id_priv->state == CMA_IDLE) {
1482 ((struct sockaddr *) &id->route.addr.src_addr)->sa_family = AF_INET;
1483 ret = rdma_bind_addr(id, (struct sockaddr *) &id->route.addr.src_addr);
1484 if (ret)
1485 return ret;
1486 }
1487
1488 if (!cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_LISTEN))
1489 return -EINVAL;
1490
1491 id_priv->backlog = backlog;
1492 if (id->device) {
1493 switch (rdma_node_get_transport(id->device->node_type)) {
1494 case RDMA_TRANSPORT_IB:
1495 ret = cma_ib_listen(id_priv);
1496 if (ret)
1497 goto err;
1498 break;
1499 case RDMA_TRANSPORT_IWARP:
1500 ret = cma_iw_listen(id_priv, backlog);
1501 if (ret)
1502 goto err;
1503 break;
1504 default:
1505 ret = -ENOSYS;
1506 goto err;
1507 }
1508 } else
1509 cma_listen_on_all(id_priv);
1510
1511 return 0;
1512 err:
1513 id_priv->backlog = 0;
1514 cma_comp_exch(id_priv, CMA_LISTEN, CMA_ADDR_BOUND);
1515 return ret;
1516 }
1517 EXPORT_SYMBOL(rdma_listen);
1518
1519 void rdma_set_service_type(struct rdma_cm_id *id, int tos)
1520 {
1521 struct rdma_id_private *id_priv;
1522
1523 id_priv = container_of(id, struct rdma_id_private, id);
1524 id_priv->tos = (u8) tos;
1525 }
1526 EXPORT_SYMBOL(rdma_set_service_type);
1527
1528 static void cma_query_handler(int status, struct ib_sa_path_rec *path_rec,
1529 void *context)
1530 {
1531 struct cma_work *work = context;
1532 struct rdma_route *route;
1533
1534 route = &work->id->id.route;
1535
1536 if (!status) {
1537 route->num_paths = 1;
1538 *route->path_rec = *path_rec;
1539 } else {
1540 work->old_state = CMA_ROUTE_QUERY;
1541 work->new_state = CMA_ADDR_RESOLVED;
1542 work->event.event = RDMA_CM_EVENT_ROUTE_ERROR;
1543 work->event.status = status;
1544 }
1545
1546 queue_work(cma_wq, &work->work);
1547 }
1548
1549 static int cma_query_ib_route(struct rdma_id_private *id_priv, int timeout_ms,
1550 struct cma_work *work)
1551 {
1552 struct rdma_addr *addr = &id_priv->id.route.addr;
1553 struct ib_sa_path_rec path_rec;
1554 ib_sa_comp_mask comp_mask;
1555 struct sockaddr_in6 *sin6;
1556
1557 memset(&path_rec, 0, sizeof path_rec);
1558 rdma_addr_get_sgid(&addr->dev_addr, &path_rec.sgid);
1559 rdma_addr_get_dgid(&addr->dev_addr, &path_rec.dgid);
1560 path_rec.pkey = cpu_to_be16(ib_addr_get_pkey(&addr->dev_addr));
1561 path_rec.numb_path = 1;
1562 path_rec.reversible = 1;
1563 path_rec.service_id = cma_get_service_id(id_priv->id.ps,
1564 (struct sockaddr *) &addr->dst_addr);
1565
1566 comp_mask = IB_SA_PATH_REC_DGID | IB_SA_PATH_REC_SGID |
1567 IB_SA_PATH_REC_PKEY | IB_SA_PATH_REC_NUMB_PATH |
1568 IB_SA_PATH_REC_REVERSIBLE | IB_SA_PATH_REC_SERVICE_ID;
1569
1570 if (addr->src_addr.ss_family == AF_INET) {
1571 path_rec.qos_class = cpu_to_be16((u16) id_priv->tos);
1572 comp_mask |= IB_SA_PATH_REC_QOS_CLASS;
1573 } else {
1574 sin6 = (struct sockaddr_in6 *) &addr->src_addr;
1575 path_rec.traffic_class = (u8) (be32_to_cpu(sin6->sin6_flowinfo) >> 20);
1576 comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
1577 }
1578
1579 id_priv->query_id = ib_sa_path_rec_get(&sa_client, id_priv->id.device,
1580 id_priv->id.port_num, &path_rec,
1581 comp_mask, timeout_ms,
1582 GFP_KERNEL, cma_query_handler,
1583 work, &id_priv->query);
1584
1585 return (id_priv->query_id < 0) ? id_priv->query_id : 0;
1586 }
1587
1588 static void cma_work_handler(struct work_struct *_work)
1589 {
1590 struct cma_work *work = container_of(_work, struct cma_work, work);
1591 struct rdma_id_private *id_priv = work->id;
1592 int destroy = 0;
1593
1594 mutex_lock(&id_priv->handler_mutex);
1595 if (!cma_comp_exch(id_priv, work->old_state, work->new_state))
1596 goto out;
1597
1598 if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
1599 cma_exch(id_priv, CMA_DESTROYING);
1600 destroy = 1;
1601 }
1602 out:
1603 mutex_unlock(&id_priv->handler_mutex);
1604 cma_deref_id(id_priv);
1605 if (destroy)
1606 rdma_destroy_id(&id_priv->id);
1607 kfree(work);
1608 }
1609
1610 static void cma_ndev_work_handler(struct work_struct *_work)
1611 {
1612 struct cma_ndev_work *work = container_of(_work, struct cma_ndev_work, work);
1613 struct rdma_id_private *id_priv = work->id;
1614 int destroy = 0;
1615
1616 mutex_lock(&id_priv->handler_mutex);
1617 if (id_priv->state == CMA_DESTROYING ||
1618 id_priv->state == CMA_DEVICE_REMOVAL)
1619 goto out;
1620
1621 if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
1622 cma_exch(id_priv, CMA_DESTROYING);
1623 destroy = 1;
1624 }
1625
1626 out:
1627 mutex_unlock(&id_priv->handler_mutex);
1628 cma_deref_id(id_priv);
1629 if (destroy)
1630 rdma_destroy_id(&id_priv->id);
1631 kfree(work);
1632 }
1633
1634 static int cma_resolve_ib_route(struct rdma_id_private *id_priv, int timeout_ms)
1635 {
1636 struct rdma_route *route = &id_priv->id.route;
1637 struct cma_work *work;
1638 int ret;
1639
1640 work = kzalloc(sizeof *work, GFP_KERNEL);
1641 if (!work)
1642 return -ENOMEM;
1643
1644 work->id = id_priv;
1645 INIT_WORK(&work->work, cma_work_handler);
1646 work->old_state = CMA_ROUTE_QUERY;
1647 work->new_state = CMA_ROUTE_RESOLVED;
1648 work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
1649
1650 route->path_rec = kmalloc(sizeof *route->path_rec, GFP_KERNEL);
1651 if (!route->path_rec) {
1652 ret = -ENOMEM;
1653 goto err1;
1654 }
1655
1656 ret = cma_query_ib_route(id_priv, timeout_ms, work);
1657 if (ret)
1658 goto err2;
1659
1660 return 0;
1661 err2:
1662 kfree(route->path_rec);
1663 route->path_rec = NULL;
1664 err1:
1665 kfree(work);
1666 return ret;
1667 }
1668
1669 int rdma_set_ib_paths(struct rdma_cm_id *id,
1670 struct ib_sa_path_rec *path_rec, int num_paths)
1671 {
1672 struct rdma_id_private *id_priv;
1673 int ret;
1674
1675 id_priv = container_of(id, struct rdma_id_private, id);
1676 if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ROUTE_RESOLVED))
1677 return -EINVAL;
1678
1679 id->route.path_rec = kmalloc(sizeof *path_rec * num_paths, GFP_KERNEL);
1680 if (!id->route.path_rec) {
1681 ret = -ENOMEM;
1682 goto err;
1683 }
1684
1685 memcpy(id->route.path_rec, path_rec, sizeof *path_rec * num_paths);
1686 return 0;
1687 err:
1688 cma_comp_exch(id_priv, CMA_ROUTE_RESOLVED, CMA_ADDR_RESOLVED);
1689 return ret;
1690 }
1691 EXPORT_SYMBOL(rdma_set_ib_paths);
1692
1693 static int cma_resolve_iw_route(struct rdma_id_private *id_priv, int timeout_ms)
1694 {
1695 struct cma_work *work;
1696
1697 work = kzalloc(sizeof *work, GFP_KERNEL);
1698 if (!work)
1699 return -ENOMEM;
1700
1701 work->id = id_priv;
1702 INIT_WORK(&work->work, cma_work_handler);
1703 work->old_state = CMA_ROUTE_QUERY;
1704 work->new_state = CMA_ROUTE_RESOLVED;
1705 work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
1706 queue_work(cma_wq, &work->work);
1707 return 0;
1708 }
1709
1710 int rdma_resolve_route(struct rdma_cm_id *id, int timeout_ms)
1711 {
1712 struct rdma_id_private *id_priv;
1713 int ret;
1714
1715 id_priv = container_of(id, struct rdma_id_private, id);
1716 if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ROUTE_QUERY))
1717 return -EINVAL;
1718
1719 atomic_inc(&id_priv->refcount);
1720 switch (rdma_node_get_transport(id->device->node_type)) {
1721 case RDMA_TRANSPORT_IB:
1722 ret = cma_resolve_ib_route(id_priv, timeout_ms);
1723 break;
1724 case RDMA_TRANSPORT_IWARP:
1725 ret = cma_resolve_iw_route(id_priv, timeout_ms);
1726 break;
1727 default:
1728 ret = -ENOSYS;
1729 break;
1730 }
1731 if (ret)
1732 goto err;
1733
1734 return 0;
1735 err:
1736 cma_comp_exch(id_priv, CMA_ROUTE_QUERY, CMA_ADDR_RESOLVED);
1737 cma_deref_id(id_priv);
1738 return ret;
1739 }
1740 EXPORT_SYMBOL(rdma_resolve_route);
1741
1742 static int cma_bind_loopback(struct rdma_id_private *id_priv)
1743 {
1744 struct cma_device *cma_dev;
1745 struct ib_port_attr port_attr;
1746 union ib_gid gid;
1747 u16 pkey;
1748 int ret;
1749 u8 p;
1750
1751 mutex_lock(&lock);
1752 if (list_empty(&dev_list)) {
1753 ret = -ENODEV;
1754 goto out;
1755 }
1756 list_for_each_entry(cma_dev, &dev_list, list)
1757 for (p = 1; p <= cma_dev->device->phys_port_cnt; ++p)
1758 if (!ib_query_port(cma_dev->device, p, &port_attr) &&
1759 port_attr.state == IB_PORT_ACTIVE)
1760 goto port_found;
1761
1762 p = 1;
1763 cma_dev = list_entry(dev_list.next, struct cma_device, list);
1764
1765 port_found:
1766 ret = ib_get_cached_gid(cma_dev->device, p, 0, &gid);
1767 if (ret)
1768 goto out;
1769
1770 ret = ib_get_cached_pkey(cma_dev->device, p, 0, &pkey);
1771 if (ret)
1772 goto out;
1773
1774 id_priv->id.route.addr.dev_addr.dev_type =
1775 (rdma_node_get_transport(cma_dev->device->node_type) == RDMA_TRANSPORT_IB) ?
1776 ARPHRD_INFINIBAND : ARPHRD_ETHER;
1777
1778 rdma_addr_set_sgid(&id_priv->id.route.addr.dev_addr, &gid);
1779 ib_addr_set_pkey(&id_priv->id.route.addr.dev_addr, pkey);
1780 id_priv->id.port_num = p;
1781 cma_attach_to_dev(id_priv, cma_dev);
1782 out:
1783 mutex_unlock(&lock);
1784 return ret;
1785 }
1786
1787 static void addr_handler(int status, struct sockaddr *src_addr,
1788 struct rdma_dev_addr *dev_addr, void *context)
1789 {
1790 struct rdma_id_private *id_priv = context;
1791 struct rdma_cm_event event;
1792
1793 memset(&event, 0, sizeof event);
1794 mutex_lock(&id_priv->handler_mutex);
1795
1796 /*
1797 * Grab mutex to block rdma_destroy_id() from removing the device while
1798 * we're trying to acquire it.
1799 */
1800 mutex_lock(&lock);
1801 if (!cma_comp_exch(id_priv, CMA_ADDR_QUERY, CMA_ADDR_RESOLVED)) {
1802 mutex_unlock(&lock);
1803 goto out;
1804 }
1805
1806 if (!status && !id_priv->cma_dev)
1807 status = cma_acquire_dev(id_priv);
1808 mutex_unlock(&lock);
1809
1810 if (status) {
1811 if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ADDR_BOUND))
1812 goto out;
1813 event.event = RDMA_CM_EVENT_ADDR_ERROR;
1814 event.status = status;
1815 } else {
1816 memcpy(&id_priv->id.route.addr.src_addr, src_addr,
1817 ip_addr_size(src_addr));
1818 event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
1819 }
1820
1821 if (id_priv->id.event_handler(&id_priv->id, &event)) {
1822 cma_exch(id_priv, CMA_DESTROYING);
1823 mutex_unlock(&id_priv->handler_mutex);
1824 cma_deref_id(id_priv);
1825 rdma_destroy_id(&id_priv->id);
1826 return;
1827 }
1828 out:
1829 mutex_unlock(&id_priv->handler_mutex);
1830 cma_deref_id(id_priv);
1831 }
1832
1833 static int cma_resolve_loopback(struct rdma_id_private *id_priv)
1834 {
1835 struct cma_work *work;
1836 struct sockaddr *src, *dst;
1837 union ib_gid gid;
1838 int ret;
1839
1840 work = kzalloc(sizeof *work, GFP_KERNEL);
1841 if (!work)
1842 return -ENOMEM;
1843
1844 if (!id_priv->cma_dev) {
1845 ret = cma_bind_loopback(id_priv);
1846 if (ret)
1847 goto err;
1848 }
1849
1850 rdma_addr_get_sgid(&id_priv->id.route.addr.dev_addr, &gid);
1851 rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, &gid);
1852
1853 src = (struct sockaddr *) &id_priv->id.route.addr.src_addr;
1854 if (cma_zero_addr(src)) {
1855 dst = (struct sockaddr *) &id_priv->id.route.addr.dst_addr;
1856 if ((src->sa_family = dst->sa_family) == AF_INET) {
1857 ((struct sockaddr_in *) src)->sin_addr.s_addr =
1858 ((struct sockaddr_in *) dst)->sin_addr.s_addr;
1859 } else {
1860 ipv6_addr_copy(&((struct sockaddr_in6 *) src)->sin6_addr,
1861 &((struct sockaddr_in6 *) dst)->sin6_addr);
1862 }
1863 }
1864
1865 work->id = id_priv;
1866 INIT_WORK(&work->work, cma_work_handler);
1867 work->old_state = CMA_ADDR_QUERY;
1868 work->new_state = CMA_ADDR_RESOLVED;
1869 work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
1870 queue_work(cma_wq, &work->work);
1871 return 0;
1872 err:
1873 kfree(work);
1874 return ret;
1875 }
1876
1877 static int cma_bind_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
1878 struct sockaddr *dst_addr)
1879 {
1880 if (!src_addr || !src_addr->sa_family) {
1881 src_addr = (struct sockaddr *) &id->route.addr.src_addr;
1882 if ((src_addr->sa_family = dst_addr->sa_family) == AF_INET6) {
1883 ((struct sockaddr_in6 *) src_addr)->sin6_scope_id =
1884 ((struct sockaddr_in6 *) dst_addr)->sin6_scope_id;
1885 }
1886 }
1887 return rdma_bind_addr(id, src_addr);
1888 }
1889
1890 int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
1891 struct sockaddr *dst_addr, int timeout_ms)
1892 {
1893 struct rdma_id_private *id_priv;
1894 int ret;
1895
1896 id_priv = container_of(id, struct rdma_id_private, id);
1897 if (id_priv->state == CMA_IDLE) {
1898 ret = cma_bind_addr(id, src_addr, dst_addr);
1899 if (ret)
1900 return ret;
1901 }
1902
1903 if (!cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_ADDR_QUERY))
1904 return -EINVAL;
1905
1906 atomic_inc(&id_priv->refcount);
1907 memcpy(&id->route.addr.dst_addr, dst_addr, ip_addr_size(dst_addr));
1908 if (cma_any_addr(dst_addr))
1909 ret = cma_resolve_loopback(id_priv);
1910 else
1911 ret = rdma_resolve_ip(&addr_client, (struct sockaddr *) &id->route.addr.src_addr,
1912 dst_addr, &id->route.addr.dev_addr,
1913 timeout_ms, addr_handler, id_priv);
1914 if (ret)
1915 goto err;
1916
1917 return 0;
1918 err:
1919 cma_comp_exch(id_priv, CMA_ADDR_QUERY, CMA_ADDR_BOUND);
1920 cma_deref_id(id_priv);
1921 return ret;
1922 }
1923 EXPORT_SYMBOL(rdma_resolve_addr);
1924
1925 static void cma_bind_port(struct rdma_bind_list *bind_list,
1926 struct rdma_id_private *id_priv)
1927 {
1928 struct sockaddr_in *sin;
1929
1930 sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
1931 sin->sin_port = htons(bind_list->port);
1932 id_priv->bind_list = bind_list;
1933 hlist_add_head(&id_priv->node, &bind_list->owners);
1934 }
1935
1936 static int cma_alloc_port(struct idr *ps, struct rdma_id_private *id_priv,
1937 unsigned short snum)
1938 {
1939 struct rdma_bind_list *bind_list;
1940 int port, ret;
1941
1942 bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL);
1943 if (!bind_list)
1944 return -ENOMEM;
1945
1946 do {
1947 ret = idr_get_new_above(ps, bind_list, snum, &port);
1948 } while ((ret == -EAGAIN) && idr_pre_get(ps, GFP_KERNEL));
1949
1950 if (ret)
1951 goto err1;
1952
1953 if (port != snum) {
1954 ret = -EADDRNOTAVAIL;
1955 goto err2;
1956 }
1957
1958 bind_list->ps = ps;
1959 bind_list->port = (unsigned short) port;
1960 cma_bind_port(bind_list, id_priv);
1961 return 0;
1962 err2:
1963 idr_remove(ps, port);
1964 err1:
1965 kfree(bind_list);
1966 return ret;
1967 }
1968
1969 static int cma_alloc_any_port(struct idr *ps, struct rdma_id_private *id_priv)
1970 {
1971 struct rdma_bind_list *bind_list;
1972 int port, ret, low, high;
1973
1974 bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL);
1975 if (!bind_list)
1976 return -ENOMEM;
1977
1978 retry:
1979 /* FIXME: add proper port randomization per like inet_csk_get_port */
1980 do {
1981 ret = idr_get_new_above(ps, bind_list, next_port, &port);
1982 } while ((ret == -EAGAIN) && idr_pre_get(ps, GFP_KERNEL));
1983
1984 if (ret)
1985 goto err1;
1986
1987 inet_get_local_port_range(&low, &high);
1988 if (port > high) {
1989 if (next_port != low) {
1990 idr_remove(ps, port);
1991 next_port = low;
1992 goto retry;
1993 }
1994 ret = -EADDRNOTAVAIL;
1995 goto err2;
1996 }
1997
1998 if (port == high)
1999 next_port = low;
2000 else
2001 next_port = port + 1;
2002
2003 bind_list->ps = ps;
2004 bind_list->port = (unsigned short) port;
2005 cma_bind_port(bind_list, id_priv);
2006 return 0;
2007 err2:
2008 idr_remove(ps, port);
2009 err1:
2010 kfree(bind_list);
2011 return ret;
2012 }
2013
2014 static int cma_use_port(struct idr *ps, struct rdma_id_private *id_priv)
2015 {
2016 struct rdma_id_private *cur_id;
2017 struct sockaddr_in *sin, *cur_sin;
2018 struct rdma_bind_list *bind_list;
2019 struct hlist_node *node;
2020 unsigned short snum;
2021
2022 sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
2023 snum = ntohs(sin->sin_port);
2024 if (snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
2025 return -EACCES;
2026
2027 bind_list = idr_find(ps, snum);
2028 if (!bind_list)
2029 return cma_alloc_port(ps, id_priv, snum);
2030
2031 /*
2032 * We don't support binding to any address if anyone is bound to
2033 * a specific address on the same port.
2034 */
2035 if (cma_any_addr((struct sockaddr *) &id_priv->id.route.addr.src_addr))
2036 return -EADDRNOTAVAIL;
2037
2038 hlist_for_each_entry(cur_id, node, &bind_list->owners, node) {
2039 if (cma_any_addr((struct sockaddr *) &cur_id->id.route.addr.src_addr))
2040 return -EADDRNOTAVAIL;
2041
2042 cur_sin = (struct sockaddr_in *) &cur_id->id.route.addr.src_addr;
2043 if (sin->sin_addr.s_addr == cur_sin->sin_addr.s_addr)
2044 return -EADDRINUSE;
2045 }
2046
2047 cma_bind_port(bind_list, id_priv);
2048 return 0;
2049 }
2050
2051 static int cma_get_port(struct rdma_id_private *id_priv)
2052 {
2053 struct idr *ps;
2054 int ret;
2055
2056 switch (id_priv->id.ps) {
2057 case RDMA_PS_SDP:
2058 ps = &sdp_ps;
2059 break;
2060 case RDMA_PS_TCP:
2061 ps = &tcp_ps;
2062 break;
2063 case RDMA_PS_UDP:
2064 ps = &udp_ps;
2065 break;
2066 case RDMA_PS_IPOIB:
2067 ps = &ipoib_ps;
2068 break;
2069 default:
2070 return -EPROTONOSUPPORT;
2071 }
2072
2073 mutex_lock(&lock);
2074 if (cma_any_port((struct sockaddr *) &id_priv->id.route.addr.src_addr))
2075 ret = cma_alloc_any_port(ps, id_priv);
2076 else
2077 ret = cma_use_port(ps, id_priv);
2078 mutex_unlock(&lock);
2079
2080 return ret;
2081 }
2082
2083 static int cma_check_linklocal(struct rdma_dev_addr *dev_addr,
2084 struct sockaddr *addr)
2085 {
2086 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2087 struct sockaddr_in6 *sin6;
2088
2089 if (addr->sa_family != AF_INET6)
2090 return 0;
2091
2092 sin6 = (struct sockaddr_in6 *) addr;
2093 if ((ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) &&
2094 !sin6->sin6_scope_id)
2095 return -EINVAL;
2096
2097 dev_addr->bound_dev_if = sin6->sin6_scope_id;
2098 #endif
2099 return 0;
2100 }
2101
2102 int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr)
2103 {
2104 struct rdma_id_private *id_priv;
2105 int ret;
2106
2107 if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6)
2108 return -EAFNOSUPPORT;
2109
2110 id_priv = container_of(id, struct rdma_id_private, id);
2111 if (!cma_comp_exch(id_priv, CMA_IDLE, CMA_ADDR_BOUND))
2112 return -EINVAL;
2113
2114 ret = cma_check_linklocal(&id->route.addr.dev_addr, addr);
2115 if (ret)
2116 goto err1;
2117
2118 if (!cma_any_addr(addr)) {
2119 ret = rdma_translate_ip(addr, &id->route.addr.dev_addr);
2120 if (ret)
2121 goto err1;
2122
2123 mutex_lock(&lock);
2124 ret = cma_acquire_dev(id_priv);
2125 mutex_unlock(&lock);
2126 if (ret)
2127 goto err1;
2128 }
2129
2130 memcpy(&id->route.addr.src_addr, addr, ip_addr_size(addr));
2131 ret = cma_get_port(id_priv);
2132 if (ret)
2133 goto err2;
2134
2135 return 0;
2136 err2:
2137 if (id_priv->cma_dev) {
2138 mutex_lock(&lock);
2139 cma_detach_from_dev(id_priv);
2140 mutex_unlock(&lock);
2141 }
2142 err1:
2143 cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_IDLE);
2144 return ret;
2145 }
2146 EXPORT_SYMBOL(rdma_bind_addr);
2147
2148 static int cma_format_hdr(void *hdr, enum rdma_port_space ps,
2149 struct rdma_route *route)
2150 {
2151 struct cma_hdr *cma_hdr;
2152 struct sdp_hh *sdp_hdr;
2153
2154 if (route->addr.src_addr.ss_family == AF_INET) {
2155 struct sockaddr_in *src4, *dst4;
2156
2157 src4 = (struct sockaddr_in *) &route->addr.src_addr;
2158 dst4 = (struct sockaddr_in *) &route->addr.dst_addr;
2159
2160 switch (ps) {
2161 case RDMA_PS_SDP:
2162 sdp_hdr = hdr;
2163 if (sdp_get_majv(sdp_hdr->sdp_version) != SDP_MAJ_VERSION)
2164 return -EINVAL;
2165 sdp_set_ip_ver(sdp_hdr, 4);
2166 sdp_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
2167 sdp_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
2168 sdp_hdr->port = src4->sin_port;
2169 break;
2170 default:
2171 cma_hdr = hdr;
2172 cma_hdr->cma_version = CMA_VERSION;
2173 cma_set_ip_ver(cma_hdr, 4);
2174 cma_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
2175 cma_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
2176 cma_hdr->port = src4->sin_port;
2177 break;
2178 }
2179 } else {
2180 struct sockaddr_in6 *src6, *dst6;
2181
2182 src6 = (struct sockaddr_in6 *) &route->addr.src_addr;
2183 dst6 = (struct sockaddr_in6 *) &route->addr.dst_addr;
2184
2185 switch (ps) {
2186 case RDMA_PS_SDP:
2187 sdp_hdr = hdr;
2188 if (sdp_get_majv(sdp_hdr->sdp_version) != SDP_MAJ_VERSION)
2189 return -EINVAL;
2190 sdp_set_ip_ver(sdp_hdr, 6);
2191 sdp_hdr->src_addr.ip6 = src6->sin6_addr;
2192 sdp_hdr->dst_addr.ip6 = dst6->sin6_addr;
2193 sdp_hdr->port = src6->sin6_port;
2194 break;
2195 default:
2196 cma_hdr = hdr;
2197 cma_hdr->cma_version = CMA_VERSION;
2198 cma_set_ip_ver(cma_hdr, 6);
2199 cma_hdr->src_addr.ip6 = src6->sin6_addr;
2200 cma_hdr->dst_addr.ip6 = dst6->sin6_addr;
2201 cma_hdr->port = src6->sin6_port;
2202 break;
2203 }
2204 }
2205 return 0;
2206 }
2207
2208 static int cma_sidr_rep_handler(struct ib_cm_id *cm_id,
2209 struct ib_cm_event *ib_event)
2210 {
2211 struct rdma_id_private *id_priv = cm_id->context;
2212 struct rdma_cm_event event;
2213 struct ib_cm_sidr_rep_event_param *rep = &ib_event->param.sidr_rep_rcvd;
2214 int ret = 0;
2215
2216 if (cma_disable_callback(id_priv, CMA_CONNECT))
2217 return 0;
2218
2219 memset(&event, 0, sizeof event);
2220 switch (ib_event->event) {
2221 case IB_CM_SIDR_REQ_ERROR:
2222 event.event = RDMA_CM_EVENT_UNREACHABLE;
2223 event.status = -ETIMEDOUT;
2224 break;
2225 case IB_CM_SIDR_REP_RECEIVED:
2226 event.param.ud.private_data = ib_event->private_data;
2227 event.param.ud.private_data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
2228 if (rep->status != IB_SIDR_SUCCESS) {
2229 event.event = RDMA_CM_EVENT_UNREACHABLE;
2230 event.status = ib_event->param.sidr_rep_rcvd.status;
2231 break;
2232 }
2233 ret = cma_set_qkey(id_priv);
2234 if (ret) {
2235 event.event = RDMA_CM_EVENT_ADDR_ERROR;
2236 event.status = -EINVAL;
2237 break;
2238 }
2239 if (id_priv->qkey != rep->qkey) {
2240 event.event = RDMA_CM_EVENT_UNREACHABLE;
2241 event.status = -EINVAL;
2242 break;
2243 }
2244 ib_init_ah_from_path(id_priv->id.device, id_priv->id.port_num,
2245 id_priv->id.route.path_rec,
2246 &event.param.ud.ah_attr);
2247 event.param.ud.qp_num = rep->qpn;
2248 event.param.ud.qkey = rep->qkey;
2249 event.event = RDMA_CM_EVENT_ESTABLISHED;
2250 event.status = 0;
2251 break;
2252 default:
2253 printk(KERN_ERR "RDMA CMA: unexpected IB CM event: %d\n",
2254 ib_event->event);
2255 goto out;
2256 }
2257
2258 ret = id_priv->id.event_handler(&id_priv->id, &event);
2259 if (ret) {
2260 /* Destroy the CM ID by returning a non-zero value. */
2261 id_priv->cm_id.ib = NULL;
2262 cma_exch(id_priv, CMA_DESTROYING);
2263 mutex_unlock(&id_priv->handler_mutex);
2264 rdma_destroy_id(&id_priv->id);
2265 return ret;
2266 }
2267 out:
2268 mutex_unlock(&id_priv->handler_mutex);
2269 return ret;
2270 }
2271
2272 static int cma_resolve_ib_udp(struct rdma_id_private *id_priv,
2273 struct rdma_conn_param *conn_param)
2274 {
2275 struct ib_cm_sidr_req_param req;
2276 struct rdma_route *route;
2277 int ret;
2278
2279 req.private_data_len = sizeof(struct cma_hdr) +
2280 conn_param->private_data_len;
2281 req.private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
2282 if (!req.private_data)
2283 return -ENOMEM;
2284
2285 if (conn_param->private_data && conn_param->private_data_len)
2286 memcpy((void *) req.private_data + sizeof(struct cma_hdr),
2287 conn_param->private_data, conn_param->private_data_len);
2288
2289 route = &id_priv->id.route;
2290 ret = cma_format_hdr((void *) req.private_data, id_priv->id.ps, route);
2291 if (ret)
2292 goto out;
2293
2294 id_priv->cm_id.ib = ib_create_cm_id(id_priv->id.device,
2295 cma_sidr_rep_handler, id_priv);
2296 if (IS_ERR(id_priv->cm_id.ib)) {
2297 ret = PTR_ERR(id_priv->cm_id.ib);
2298 goto out;
2299 }
2300
2301 req.path = route->path_rec;
2302 req.service_id = cma_get_service_id(id_priv->id.ps,
2303 (struct sockaddr *) &route->addr.dst_addr);
2304 req.timeout_ms = 1 << (CMA_CM_RESPONSE_TIMEOUT - 8);
2305 req.max_cm_retries = CMA_MAX_CM_RETRIES;
2306
2307 ret = ib_send_cm_sidr_req(id_priv->cm_id.ib, &req);
2308 if (ret) {
2309 ib_destroy_cm_id(id_priv->cm_id.ib);
2310 id_priv->cm_id.ib = NULL;
2311 }
2312 out:
2313 kfree(req.private_data);
2314 return ret;
2315 }
2316
2317 static int cma_connect_ib(struct rdma_id_private *id_priv,
2318 struct rdma_conn_param *conn_param)
2319 {
2320 struct ib_cm_req_param req;
2321 struct rdma_route *route;
2322 void *private_data;
2323 int offset, ret;
2324
2325 memset(&req, 0, sizeof req);
2326 offset = cma_user_data_offset(id_priv->id.ps);
2327 req.private_data_len = offset + conn_param->private_data_len;
2328 private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
2329 if (!private_data)
2330 return -ENOMEM;
2331
2332 if (conn_param->private_data && conn_param->private_data_len)
2333 memcpy(private_data + offset, conn_param->private_data,
2334 conn_param->private_data_len);
2335
2336 id_priv->cm_id.ib = ib_create_cm_id(id_priv->id.device, cma_ib_handler,
2337 id_priv);
2338 if (IS_ERR(id_priv->cm_id.ib)) {
2339 ret = PTR_ERR(id_priv->cm_id.ib);
2340 goto out;
2341 }
2342
2343 route = &id_priv->id.route;
2344 ret = cma_format_hdr(private_data, id_priv->id.ps, route);
2345 if (ret)
2346 goto out;
2347 req.private_data = private_data;
2348
2349 req.primary_path = &route->path_rec[0];
2350 if (route->num_paths == 2)
2351 req.alternate_path = &route->path_rec[1];
2352
2353 req.service_id = cma_get_service_id(id_priv->id.ps,
2354 (struct sockaddr *) &route->addr.dst_addr);
2355 req.qp_num = id_priv->qp_num;
2356 req.qp_type = IB_QPT_RC;
2357 req.starting_psn = id_priv->seq_num;
2358 req.responder_resources = conn_param->responder_resources;
2359 req.initiator_depth = conn_param->initiator_depth;
2360 req.flow_control = conn_param->flow_control;
2361 req.retry_count = conn_param->retry_count;
2362 req.rnr_retry_count = conn_param->rnr_retry_count;
2363 req.remote_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
2364 req.local_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
2365 req.max_cm_retries = CMA_MAX_CM_RETRIES;
2366 req.srq = id_priv->srq ? 1 : 0;
2367
2368 ret = ib_send_cm_req(id_priv->cm_id.ib, &req);
2369 out:
2370 if (ret && !IS_ERR(id_priv->cm_id.ib)) {
2371 ib_destroy_cm_id(id_priv->cm_id.ib);
2372 id_priv->cm_id.ib = NULL;
2373 }
2374
2375 kfree(private_data);
2376 return ret;
2377 }
2378
2379 static int cma_connect_iw(struct rdma_id_private *id_priv,
2380 struct rdma_conn_param *conn_param)
2381 {
2382 struct iw_cm_id *cm_id;
2383 struct sockaddr_in* sin;
2384 int ret;
2385 struct iw_cm_conn_param iw_param;
2386
2387 cm_id = iw_create_cm_id(id_priv->id.device, cma_iw_handler, id_priv);
2388 if (IS_ERR(cm_id)) {
2389 ret = PTR_ERR(cm_id);
2390 goto out;
2391 }
2392
2393 id_priv->cm_id.iw = cm_id;
2394
2395 sin = (struct sockaddr_in*) &id_priv->id.route.addr.src_addr;
2396 cm_id->local_addr = *sin;
2397
2398 sin = (struct sockaddr_in*) &id_priv->id.route.addr.dst_addr;
2399 cm_id->remote_addr = *sin;
2400
2401 ret = cma_modify_qp_rtr(id_priv, conn_param);
2402 if (ret)
2403 goto out;
2404
2405 iw_param.ord = conn_param->initiator_depth;
2406 iw_param.ird = conn_param->responder_resources;
2407 iw_param.private_data = conn_param->private_data;
2408 iw_param.private_data_len = conn_param->private_data_len;
2409 if (id_priv->id.qp)
2410 iw_param.qpn = id_priv->qp_num;
2411 else
2412 iw_param.qpn = conn_param->qp_num;
2413 ret = iw_cm_connect(cm_id, &iw_param);
2414 out:
2415 if (ret && !IS_ERR(cm_id)) {
2416 iw_destroy_cm_id(cm_id);
2417 id_priv->cm_id.iw = NULL;
2418 }
2419 return ret;
2420 }
2421
2422 int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
2423 {
2424 struct rdma_id_private *id_priv;
2425 int ret;
2426
2427 id_priv = container_of(id, struct rdma_id_private, id);
2428 if (!cma_comp_exch(id_priv, CMA_ROUTE_RESOLVED, CMA_CONNECT))
2429 return -EINVAL;
2430
2431 if (!id->qp) {
2432 id_priv->qp_num = conn_param->qp_num;
2433 id_priv->srq = conn_param->srq;
2434 }
2435
2436 switch (rdma_node_get_transport(id->device->node_type)) {
2437 case RDMA_TRANSPORT_IB:
2438 if (cma_is_ud_ps(id->ps))
2439 ret = cma_resolve_ib_udp(id_priv, conn_param);
2440 else
2441 ret = cma_connect_ib(id_priv, conn_param);
2442 break;
2443 case RDMA_TRANSPORT_IWARP:
2444 ret = cma_connect_iw(id_priv, conn_param);
2445 break;
2446 default:
2447 ret = -ENOSYS;
2448 break;
2449 }
2450 if (ret)
2451 goto err;
2452
2453 return 0;
2454 err:
2455 cma_comp_exch(id_priv, CMA_CONNECT, CMA_ROUTE_RESOLVED);
2456 return ret;
2457 }
2458 EXPORT_SYMBOL(rdma_connect);
2459
2460 static int cma_accept_ib(struct rdma_id_private *id_priv,
2461 struct rdma_conn_param *conn_param)
2462 {
2463 struct ib_cm_rep_param rep;
2464 int ret;
2465
2466 ret = cma_modify_qp_rtr(id_priv, conn_param);
2467 if (ret)
2468 goto out;
2469
2470 ret = cma_modify_qp_rts(id_priv, conn_param);
2471 if (ret)
2472 goto out;
2473
2474 memset(&rep, 0, sizeof rep);
2475 rep.qp_num = id_priv->qp_num;
2476 rep.starting_psn = id_priv->seq_num;
2477 rep.private_data = conn_param->private_data;
2478 rep.private_data_len = conn_param->private_data_len;
2479 rep.responder_resources = conn_param->responder_resources;
2480 rep.initiator_depth = conn_param->initiator_depth;
2481 rep.failover_accepted = 0;
2482 rep.flow_control = conn_param->flow_control;
2483 rep.rnr_retry_count = conn_param->rnr_retry_count;
2484 rep.srq = id_priv->srq ? 1 : 0;
2485
2486 ret = ib_send_cm_rep(id_priv->cm_id.ib, &rep);
2487 out:
2488 return ret;
2489 }
2490
2491 static int cma_accept_iw(struct rdma_id_private *id_priv,
2492 struct rdma_conn_param *conn_param)
2493 {
2494 struct iw_cm_conn_param iw_param;
2495 int ret;
2496
2497 ret = cma_modify_qp_rtr(id_priv, conn_param);
2498 if (ret)
2499 return ret;
2500
2501 iw_param.ord = conn_param->initiator_depth;
2502 iw_param.ird = conn_param->responder_resources;
2503 iw_param.private_data = conn_param->private_data;
2504 iw_param.private_data_len = conn_param->private_data_len;
2505 if (id_priv->id.qp) {
2506 iw_param.qpn = id_priv->qp_num;
2507 } else
2508 iw_param.qpn = conn_param->qp_num;
2509
2510 return iw_cm_accept(id_priv->cm_id.iw, &iw_param);
2511 }
2512
2513 static int cma_send_sidr_rep(struct rdma_id_private *id_priv,
2514 enum ib_cm_sidr_status status,
2515 const void *private_data, int private_data_len)
2516 {
2517 struct ib_cm_sidr_rep_param rep;
2518 int ret;
2519
2520 memset(&rep, 0, sizeof rep);
2521 rep.status = status;
2522 if (status == IB_SIDR_SUCCESS) {
2523 ret = cma_set_qkey(id_priv);
2524 if (ret)
2525 return ret;
2526 rep.qp_num = id_priv->qp_num;
2527 rep.qkey = id_priv->qkey;
2528 }
2529 rep.private_data = private_data;
2530 rep.private_data_len = private_data_len;
2531
2532 return ib_send_cm_sidr_rep(id_priv->cm_id.ib, &rep);
2533 }
2534
2535 int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
2536 {
2537 struct rdma_id_private *id_priv;
2538 int ret;
2539
2540 id_priv = container_of(id, struct rdma_id_private, id);
2541 if (!cma_comp(id_priv, CMA_CONNECT))
2542 return -EINVAL;
2543
2544 if (!id->qp && conn_param) {
2545 id_priv->qp_num = conn_param->qp_num;
2546 id_priv->srq = conn_param->srq;
2547 }
2548
2549 switch (rdma_node_get_transport(id->device->node_type)) {
2550 case RDMA_TRANSPORT_IB:
2551 if (cma_is_ud_ps(id->ps))
2552 ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
2553 conn_param->private_data,
2554 conn_param->private_data_len);
2555 else if (conn_param)
2556 ret = cma_accept_ib(id_priv, conn_param);
2557 else
2558 ret = cma_rep_recv(id_priv);
2559 break;
2560 case RDMA_TRANSPORT_IWARP:
2561 ret = cma_accept_iw(id_priv, conn_param);
2562 break;
2563 default:
2564 ret = -ENOSYS;
2565 break;
2566 }
2567
2568 if (ret)
2569 goto reject;
2570
2571 return 0;
2572 reject:
2573 cma_modify_qp_err(id_priv);
2574 rdma_reject(id, NULL, 0);
2575 return ret;
2576 }
2577 EXPORT_SYMBOL(rdma_accept);
2578
2579 int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event)
2580 {
2581 struct rdma_id_private *id_priv;
2582 int ret;
2583
2584 id_priv = container_of(id, struct rdma_id_private, id);
2585 if (!cma_has_cm_dev(id_priv))
2586 return -EINVAL;
2587
2588 switch (id->device->node_type) {
2589 case RDMA_NODE_IB_CA:
2590 ret = ib_cm_notify(id_priv->cm_id.ib, event);
2591 break;
2592 default:
2593 ret = 0;
2594 break;
2595 }
2596 return ret;
2597 }
2598 EXPORT_SYMBOL(rdma_notify);
2599
2600 int rdma_reject(struct rdma_cm_id *id, const void *private_data,
2601 u8 private_data_len)
2602 {
2603 struct rdma_id_private *id_priv;
2604 int ret;
2605
2606 id_priv = container_of(id, struct rdma_id_private, id);
2607 if (!cma_has_cm_dev(id_priv))
2608 return -EINVAL;
2609
2610 switch (rdma_node_get_transport(id->device->node_type)) {
2611 case RDMA_TRANSPORT_IB:
2612 if (cma_is_ud_ps(id->ps))
2613 ret = cma_send_sidr_rep(id_priv, IB_SIDR_REJECT,
2614 private_data, private_data_len);
2615 else
2616 ret = ib_send_cm_rej(id_priv->cm_id.ib,
2617 IB_CM_REJ_CONSUMER_DEFINED, NULL,
2618 0, private_data, private_data_len);
2619 break;
2620 case RDMA_TRANSPORT_IWARP:
2621 ret = iw_cm_reject(id_priv->cm_id.iw,
2622 private_data, private_data_len);
2623 break;
2624 default:
2625 ret = -ENOSYS;
2626 break;
2627 }
2628 return ret;
2629 }
2630 EXPORT_SYMBOL(rdma_reject);
2631
2632 int rdma_disconnect(struct rdma_cm_id *id)
2633 {
2634 struct rdma_id_private *id_priv;
2635 int ret;
2636
2637 id_priv = container_of(id, struct rdma_id_private, id);
2638 if (!cma_has_cm_dev(id_priv))
2639 return -EINVAL;
2640
2641 switch (rdma_node_get_transport(id->device->node_type)) {
2642 case RDMA_TRANSPORT_IB:
2643 ret = cma_modify_qp_err(id_priv);
2644 if (ret)
2645 goto out;
2646 /* Initiate or respond to a disconnect. */
2647 if (ib_send_cm_dreq(id_priv->cm_id.ib, NULL, 0))
2648 ib_send_cm_drep(id_priv->cm_id.ib, NULL, 0);
2649 break;
2650 case RDMA_TRANSPORT_IWARP:
2651 ret = iw_cm_disconnect(id_priv->cm_id.iw, 0);
2652 break;
2653 default:
2654 ret = -EINVAL;
2655 break;
2656 }
2657 out:
2658 return ret;
2659 }
2660 EXPORT_SYMBOL(rdma_disconnect);
2661
2662 static int cma_ib_mc_handler(int status, struct ib_sa_multicast *multicast)
2663 {
2664 struct rdma_id_private *id_priv;
2665 struct cma_multicast *mc = multicast->context;
2666 struct rdma_cm_event event;
2667 int ret;
2668
2669 id_priv = mc->id_priv;
2670 if (cma_disable_callback(id_priv, CMA_ADDR_BOUND) &&
2671 cma_disable_callback(id_priv, CMA_ADDR_RESOLVED))
2672 return 0;
2673
2674 mutex_lock(&id_priv->qp_mutex);
2675 if (!status && id_priv->id.qp)
2676 status = ib_attach_mcast(id_priv->id.qp, &multicast->rec.mgid,
2677 multicast->rec.mlid);
2678 mutex_unlock(&id_priv->qp_mutex);
2679
2680 memset(&event, 0, sizeof event);
2681 event.status = status;
2682 event.param.ud.private_data = mc->context;
2683 if (!status) {
2684 event.event = RDMA_CM_EVENT_MULTICAST_JOIN;
2685 ib_init_ah_from_mcmember(id_priv->id.device,
2686 id_priv->id.port_num, &multicast->rec,
2687 &event.param.ud.ah_attr);
2688 event.param.ud.qp_num = 0xFFFFFF;
2689 event.param.ud.qkey = be32_to_cpu(multicast->rec.qkey);
2690 } else
2691 event.event = RDMA_CM_EVENT_MULTICAST_ERROR;
2692
2693 ret = id_priv->id.event_handler(&id_priv->id, &event);
2694 if (ret) {
2695 cma_exch(id_priv, CMA_DESTROYING);
2696 mutex_unlock(&id_priv->handler_mutex);
2697 rdma_destroy_id(&id_priv->id);
2698 return 0;
2699 }
2700
2701 mutex_unlock(&id_priv->handler_mutex);
2702 return 0;
2703 }
2704
2705 static void cma_set_mgid(struct rdma_id_private *id_priv,
2706 struct sockaddr *addr, union ib_gid *mgid)
2707 {
2708 unsigned char mc_map[MAX_ADDR_LEN];
2709 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
2710 struct sockaddr_in *sin = (struct sockaddr_in *) addr;
2711 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) addr;
2712
2713 if (cma_any_addr(addr)) {
2714 memset(mgid, 0, sizeof *mgid);
2715 } else if ((addr->sa_family == AF_INET6) &&
2716 ((be32_to_cpu(sin6->sin6_addr.s6_addr32[0]) & 0xFFF0FFFF) ==
2717 0xFF10A01B)) {
2718 /* IPv6 address is an SA assigned MGID. */
2719 memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
2720 } else if ((addr->sa_family == AF_INET6)) {
2721 ipv6_ib_mc_map(&sin6->sin6_addr, dev_addr->broadcast, mc_map);
2722 if (id_priv->id.ps == RDMA_PS_UDP)
2723 mc_map[7] = 0x01; /* Use RDMA CM signature */
2724 *mgid = *(union ib_gid *) (mc_map + 4);
2725 } else {
2726 ip_ib_mc_map(sin->sin_addr.s_addr, dev_addr->broadcast, mc_map);
2727 if (id_priv->id.ps == RDMA_PS_UDP)
2728 mc_map[7] = 0x01; /* Use RDMA CM signature */
2729 *mgid = *(union ib_gid *) (mc_map + 4);
2730 }
2731 }
2732
2733 static int cma_join_ib_multicast(struct rdma_id_private *id_priv,
2734 struct cma_multicast *mc)
2735 {
2736 struct ib_sa_mcmember_rec rec;
2737 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
2738 ib_sa_comp_mask comp_mask;
2739 int ret;
2740
2741 ib_addr_get_mgid(dev_addr, &rec.mgid);
2742 ret = ib_sa_get_mcmember_rec(id_priv->id.device, id_priv->id.port_num,
2743 &rec.mgid, &rec);
2744 if (ret)
2745 return ret;
2746
2747 cma_set_mgid(id_priv, (struct sockaddr *) &mc->addr, &rec.mgid);
2748 if (id_priv->id.ps == RDMA_PS_UDP)
2749 rec.qkey = cpu_to_be32(RDMA_UDP_QKEY);
2750 rdma_addr_get_sgid(dev_addr, &rec.port_gid);
2751 rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
2752 rec.join_state = 1;
2753
2754 comp_mask = IB_SA_MCMEMBER_REC_MGID | IB_SA_MCMEMBER_REC_PORT_GID |
2755 IB_SA_MCMEMBER_REC_PKEY | IB_SA_MCMEMBER_REC_JOIN_STATE |
2756 IB_SA_MCMEMBER_REC_QKEY | IB_SA_MCMEMBER_REC_SL |
2757 IB_SA_MCMEMBER_REC_FLOW_LABEL |
2758 IB_SA_MCMEMBER_REC_TRAFFIC_CLASS;
2759
2760 if (id_priv->id.ps == RDMA_PS_IPOIB)
2761 comp_mask |= IB_SA_MCMEMBER_REC_RATE |
2762 IB_SA_MCMEMBER_REC_RATE_SELECTOR;
2763
2764 mc->multicast.ib = ib_sa_join_multicast(&sa_client, id_priv->id.device,
2765 id_priv->id.port_num, &rec,
2766 comp_mask, GFP_KERNEL,
2767 cma_ib_mc_handler, mc);
2768 if (IS_ERR(mc->multicast.ib))
2769 return PTR_ERR(mc->multicast.ib);
2770
2771 return 0;
2772 }
2773
2774 int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
2775 void *context)
2776 {
2777 struct rdma_id_private *id_priv;
2778 struct cma_multicast *mc;
2779 int ret;
2780
2781 id_priv = container_of(id, struct rdma_id_private, id);
2782 if (!cma_comp(id_priv, CMA_ADDR_BOUND) &&
2783 !cma_comp(id_priv, CMA_ADDR_RESOLVED))
2784 return -EINVAL;
2785
2786 mc = kmalloc(sizeof *mc, GFP_KERNEL);
2787 if (!mc)
2788 return -ENOMEM;
2789
2790 memcpy(&mc->addr, addr, ip_addr_size(addr));
2791 mc->context = context;
2792 mc->id_priv = id_priv;
2793
2794 spin_lock(&id_priv->lock);
2795 list_add(&mc->list, &id_priv->mc_list);
2796 spin_unlock(&id_priv->lock);
2797
2798 switch (rdma_node_get_transport(id->device->node_type)) {
2799 case RDMA_TRANSPORT_IB:
2800 ret = cma_join_ib_multicast(id_priv, mc);
2801 break;
2802 default:
2803 ret = -ENOSYS;
2804 break;
2805 }
2806
2807 if (ret) {
2808 spin_lock_irq(&id_priv->lock);
2809 list_del(&mc->list);
2810 spin_unlock_irq(&id_priv->lock);
2811 kfree(mc);
2812 }
2813 return ret;
2814 }
2815 EXPORT_SYMBOL(rdma_join_multicast);
2816
2817 void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr)
2818 {
2819 struct rdma_id_private *id_priv;
2820 struct cma_multicast *mc;
2821
2822 id_priv = container_of(id, struct rdma_id_private, id);
2823 spin_lock_irq(&id_priv->lock);
2824 list_for_each_entry(mc, &id_priv->mc_list, list) {
2825 if (!memcmp(&mc->addr, addr, ip_addr_size(addr))) {
2826 list_del(&mc->list);
2827 spin_unlock_irq(&id_priv->lock);
2828
2829 if (id->qp)
2830 ib_detach_mcast(id->qp,
2831 &mc->multicast.ib->rec.mgid,
2832 mc->multicast.ib->rec.mlid);
2833 ib_sa_free_multicast(mc->multicast.ib);
2834 kfree(mc);
2835 return;
2836 }
2837 }
2838 spin_unlock_irq(&id_priv->lock);
2839 }
2840 EXPORT_SYMBOL(rdma_leave_multicast);
2841
2842 static int cma_netdev_change(struct net_device *ndev, struct rdma_id_private *id_priv)
2843 {
2844 struct rdma_dev_addr *dev_addr;
2845 struct cma_ndev_work *work;
2846
2847 dev_addr = &id_priv->id.route.addr.dev_addr;
2848
2849 if ((dev_addr->bound_dev_if == ndev->ifindex) &&
2850 memcmp(dev_addr->src_dev_addr, ndev->dev_addr, ndev->addr_len)) {
2851 printk(KERN_INFO "RDMA CM addr change for ndev %s used by id %p\n",
2852 ndev->name, &id_priv->id);
2853 work = kzalloc(sizeof *work, GFP_KERNEL);
2854 if (!work)
2855 return -ENOMEM;
2856
2857 INIT_WORK(&work->work, cma_ndev_work_handler);
2858 work->id = id_priv;
2859 work->event.event = RDMA_CM_EVENT_ADDR_CHANGE;
2860 atomic_inc(&id_priv->refcount);
2861 queue_work(cma_wq, &work->work);
2862 }
2863
2864 return 0;
2865 }
2866
2867 static int cma_netdev_callback(struct notifier_block *self, unsigned long event,
2868 void *ctx)
2869 {
2870 struct net_device *ndev = (struct net_device *)ctx;
2871 struct cma_device *cma_dev;
2872 struct rdma_id_private *id_priv;
2873 int ret = NOTIFY_DONE;
2874
2875 if (dev_net(ndev) != &init_net)
2876 return NOTIFY_DONE;
2877
2878 if (event != NETDEV_BONDING_FAILOVER)
2879 return NOTIFY_DONE;
2880
2881 if (!(ndev->flags & IFF_MASTER) || !(ndev->priv_flags & IFF_BONDING))
2882 return NOTIFY_DONE;
2883
2884 mutex_lock(&lock);
2885 list_for_each_entry(cma_dev, &dev_list, list)
2886 list_for_each_entry(id_priv, &cma_dev->id_list, list) {
2887 ret = cma_netdev_change(ndev, id_priv);
2888 if (ret)
2889 goto out;
2890 }
2891
2892 out:
2893 mutex_unlock(&lock);
2894 return ret;
2895 }
2896
2897 static struct notifier_block cma_nb = {
2898 .notifier_call = cma_netdev_callback
2899 };
2900
2901 static void cma_add_one(struct ib_device *device)
2902 {
2903 struct cma_device *cma_dev;
2904 struct rdma_id_private *id_priv;
2905
2906 cma_dev = kmalloc(sizeof *cma_dev, GFP_KERNEL);
2907 if (!cma_dev)
2908 return;
2909
2910 cma_dev->device = device;
2911
2912 init_completion(&cma_dev->comp);
2913 atomic_set(&cma_dev->refcount, 1);
2914 INIT_LIST_HEAD(&cma_dev->id_list);
2915 ib_set_client_data(device, &cma_client, cma_dev);
2916
2917 mutex_lock(&lock);
2918 list_add_tail(&cma_dev->list, &dev_list);
2919 list_for_each_entry(id_priv, &listen_any_list, list)
2920 cma_listen_on_dev(id_priv, cma_dev);
2921 mutex_unlock(&lock);
2922 }
2923
2924 static int cma_remove_id_dev(struct rdma_id_private *id_priv)
2925 {
2926 struct rdma_cm_event event;
2927 enum cma_state state;
2928 int ret = 0;
2929
2930 /* Record that we want to remove the device */
2931 state = cma_exch(id_priv, CMA_DEVICE_REMOVAL);
2932 if (state == CMA_DESTROYING)
2933 return 0;
2934
2935 cma_cancel_operation(id_priv, state);
2936 mutex_lock(&id_priv->handler_mutex);
2937
2938 /* Check for destruction from another callback. */
2939 if (!cma_comp(id_priv, CMA_DEVICE_REMOVAL))
2940 goto out;
2941
2942 memset(&event, 0, sizeof event);
2943 event.event = RDMA_CM_EVENT_DEVICE_REMOVAL;
2944 ret = id_priv->id.event_handler(&id_priv->id, &event);
2945 out:
2946 mutex_unlock(&id_priv->handler_mutex);
2947 return ret;
2948 }
2949
2950 static void cma_process_remove(struct cma_device *cma_dev)
2951 {
2952 struct rdma_id_private *id_priv;
2953 int ret;
2954
2955 mutex_lock(&lock);
2956 while (!list_empty(&cma_dev->id_list)) {
2957 id_priv = list_entry(cma_dev->id_list.next,
2958 struct rdma_id_private, list);
2959
2960 list_del(&id_priv->listen_list);
2961 list_del_init(&id_priv->list);
2962 atomic_inc(&id_priv->refcount);
2963 mutex_unlock(&lock);
2964
2965 ret = id_priv->internal_id ? 1 : cma_remove_id_dev(id_priv);
2966 cma_deref_id(id_priv);
2967 if (ret)
2968 rdma_destroy_id(&id_priv->id);
2969
2970 mutex_lock(&lock);
2971 }
2972 mutex_unlock(&lock);
2973
2974 cma_deref_dev(cma_dev);
2975 wait_for_completion(&cma_dev->comp);
2976 }
2977
2978 static void cma_remove_one(struct ib_device *device)
2979 {
2980 struct cma_device *cma_dev;
2981
2982 cma_dev = ib_get_client_data(device, &cma_client);
2983 if (!cma_dev)
2984 return;
2985
2986 mutex_lock(&lock);
2987 list_del(&cma_dev->list);
2988 mutex_unlock(&lock);
2989
2990 cma_process_remove(cma_dev);
2991 kfree(cma_dev);
2992 }
2993
2994 static int __init cma_init(void)
2995 {
2996 int ret, low, high, remaining;
2997
2998 get_random_bytes(&next_port, sizeof next_port);
2999 inet_get_local_port_range(&low, &high);
3000 remaining = (high - low) + 1;
3001 next_port = ((unsigned int) next_port % remaining) + low;
3002
3003 cma_wq = create_singlethread_workqueue("rdma_cm");
3004 if (!cma_wq)
3005 return -ENOMEM;
3006
3007 ib_sa_register_client(&sa_client);
3008 rdma_addr_register_client(&addr_client);
3009 register_netdevice_notifier(&cma_nb);
3010
3011 ret = ib_register_client(&cma_client);
3012 if (ret)
3013 goto err;
3014 return 0;
3015
3016 err:
3017 unregister_netdevice_notifier(&cma_nb);
3018 rdma_addr_unregister_client(&addr_client);
3019 ib_sa_unregister_client(&sa_client);
3020 destroy_workqueue(cma_wq);
3021 return ret;
3022 }
3023
3024 static void __exit cma_cleanup(void)
3025 {
3026 ib_unregister_client(&cma_client);
3027 unregister_netdevice_notifier(&cma_nb);
3028 rdma_addr_unregister_client(&addr_client);
3029 ib_sa_unregister_client(&sa_client);
3030 destroy_workqueue(cma_wq);
3031 idr_destroy(&sdp_ps);
3032 idr_destroy(&tcp_ps);
3033 idr_destroy(&udp_ps);
3034 idr_destroy(&ipoib_ps);
3035 }
3036
3037 module_init(cma_init);
3038 module_exit(cma_cleanup);
Linux with added FPC-III support