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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394...
[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 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
46 #include <rdma/rdma_cm.h>
47 #include <rdma/rdma_cm_ib.h>
48 #include <rdma/ib_cache.h>
49 #include <rdma/ib_cm.h>
50 #include <rdma/ib_sa.h>
51 #include <rdma/iw_cm.h>
52
53 MODULE_AUTHOR("Sean Hefty");
54 MODULE_DESCRIPTION("Generic RDMA CM Agent");
55 MODULE_LICENSE("Dual BSD/GPL");
56
57 #define CMA_CM_RESPONSE_TIMEOUT 20
58 #define CMA_MAX_CM_RETRIES 15
59 #define CMA_CM_MRA_SETTING (IB_CM_MRA_FLAG_DELAY | 24)
60
61 static void cma_add_one(struct ib_device *device);
62 static void cma_remove_one(struct ib_device *device);
63
64 static struct ib_client cma_client = {
65 .name = "cma",
66 .add = cma_add_one,
67 .remove = cma_remove_one
68 };
69
70 static struct ib_sa_client sa_client;
71 static struct rdma_addr_client addr_client;
72 static LIST_HEAD(dev_list);
73 static LIST_HEAD(listen_any_list);
74 static DEFINE_MUTEX(lock);
75 static struct workqueue_struct *cma_wq;
76 static DEFINE_IDR(sdp_ps);
77 static DEFINE_IDR(tcp_ps);
78 static DEFINE_IDR(udp_ps);
79 static DEFINE_IDR(ipoib_ps);
80 static int next_port;
81
82 struct cma_device {
83 struct list_head list;
84 struct ib_device *device;
85 struct completion comp;
86 atomic_t refcount;
87 struct list_head id_list;
88 };
89
90 enum cma_state {
91 CMA_IDLE,
92 CMA_ADDR_QUERY,
93 CMA_ADDR_RESOLVED,
94 CMA_ROUTE_QUERY,
95 CMA_ROUTE_RESOLVED,
96 CMA_CONNECT,
97 CMA_DISCONNECT,
98 CMA_ADDR_BOUND,
99 CMA_LISTEN,
100 CMA_DEVICE_REMOVAL,
101 CMA_DESTROYING
102 };
103
104 struct rdma_bind_list {
105 struct idr *ps;
106 struct hlist_head owners;
107 unsigned short port;
108 };
109
110 /*
111 * Device removal can occur at anytime, so we need extra handling to
112 * serialize notifying the user of device removal with other callbacks.
113 * We do this by disabling removal notification while a callback is in process,
114 * and reporting it after the callback completes.
115 */
116 struct rdma_id_private {
117 struct rdma_cm_id id;
118
119 struct rdma_bind_list *bind_list;
120 struct hlist_node node;
121 struct list_head list; /* listen_any_list or cma_device.list */
122 struct list_head listen_list; /* per device listens */
123 struct cma_device *cma_dev;
124 struct list_head mc_list;
125
126 int internal_id;
127 enum cma_state state;
128 spinlock_t lock;
129 struct mutex qp_mutex;
130
131 struct completion comp;
132 atomic_t refcount;
133 struct mutex handler_mutex;
134
135 int backlog;
136 int timeout_ms;
137 struct ib_sa_query *query;
138 int query_id;
139 union {
140 struct ib_cm_id *ib;
141 struct iw_cm_id *iw;
142 } cm_id;
143
144 u32 seq_num;
145 u32 qkey;
146 u32 qp_num;
147 u8 srq;
148 u8 tos;
149 };
150
151 struct cma_multicast {
152 struct rdma_id_private *id_priv;
153 union {
154 struct ib_sa_multicast *ib;
155 } multicast;
156 struct list_head list;
157 void *context;
158 struct sockaddr addr;
159 u8 pad[sizeof(struct sockaddr_in6) -
160 sizeof(struct sockaddr)];
161 };
162
163 struct cma_work {
164 struct work_struct work;
165 struct rdma_id_private *id;
166 enum cma_state old_state;
167 enum cma_state new_state;
168 struct rdma_cm_event event;
169 };
170
171 union cma_ip_addr {
172 struct in6_addr ip6;
173 struct {
174 __be32 pad[3];
175 __be32 addr;
176 } ip4;
177 };
178
179 struct cma_hdr {
180 u8 cma_version;
181 u8 ip_version; /* IP version: 7:4 */
182 __be16 port;
183 union cma_ip_addr src_addr;
184 union cma_ip_addr dst_addr;
185 };
186
187 struct sdp_hh {
188 u8 bsdh[16];
189 u8 sdp_version; /* Major version: 7:4 */
190 u8 ip_version; /* IP version: 7:4 */
191 u8 sdp_specific1[10];
192 __be16 port;
193 __be16 sdp_specific2;
194 union cma_ip_addr src_addr;
195 union cma_ip_addr dst_addr;
196 };
197
198 struct sdp_hah {
199 u8 bsdh[16];
200 u8 sdp_version;
201 };
202
203 #define CMA_VERSION 0x00
204 #define SDP_MAJ_VERSION 0x2
205
206 static int cma_comp(struct rdma_id_private *id_priv, enum cma_state comp)
207 {
208 unsigned long flags;
209 int ret;
210
211 spin_lock_irqsave(&id_priv->lock, flags);
212 ret = (id_priv->state == comp);
213 spin_unlock_irqrestore(&id_priv->lock, flags);
214 return ret;
215 }
216
217 static int cma_comp_exch(struct rdma_id_private *id_priv,
218 enum cma_state comp, enum cma_state exch)
219 {
220 unsigned long flags;
221 int ret;
222
223 spin_lock_irqsave(&id_priv->lock, flags);
224 if ((ret = (id_priv->state == comp)))
225 id_priv->state = exch;
226 spin_unlock_irqrestore(&id_priv->lock, flags);
227 return ret;
228 }
229
230 static enum cma_state cma_exch(struct rdma_id_private *id_priv,
231 enum cma_state exch)
232 {
233 unsigned long flags;
234 enum cma_state old;
235
236 spin_lock_irqsave(&id_priv->lock, flags);
237 old = id_priv->state;
238 id_priv->state = exch;
239 spin_unlock_irqrestore(&id_priv->lock, flags);
240 return old;
241 }
242
243 static inline u8 cma_get_ip_ver(struct cma_hdr *hdr)
244 {
245 return hdr->ip_version >> 4;
246 }
247
248 static inline void cma_set_ip_ver(struct cma_hdr *hdr, u8 ip_ver)
249 {
250 hdr->ip_version = (ip_ver << 4) | (hdr->ip_version & 0xF);
251 }
252
253 static inline u8 sdp_get_majv(u8 sdp_version)
254 {
255 return sdp_version >> 4;
256 }
257
258 static inline u8 sdp_get_ip_ver(struct sdp_hh *hh)
259 {
260 return hh->ip_version >> 4;
261 }
262
263 static inline void sdp_set_ip_ver(struct sdp_hh *hh, u8 ip_ver)
264 {
265 hh->ip_version = (ip_ver << 4) | (hh->ip_version & 0xF);
266 }
267
268 static inline int cma_is_ud_ps(enum rdma_port_space ps)
269 {
270 return (ps == RDMA_PS_UDP || ps == RDMA_PS_IPOIB);
271 }
272
273 static void cma_attach_to_dev(struct rdma_id_private *id_priv,
274 struct cma_device *cma_dev)
275 {
276 atomic_inc(&cma_dev->refcount);
277 id_priv->cma_dev = cma_dev;
278 id_priv->id.device = cma_dev->device;
279 list_add_tail(&id_priv->list, &cma_dev->id_list);
280 }
281
282 static inline void cma_deref_dev(struct cma_device *cma_dev)
283 {
284 if (atomic_dec_and_test(&cma_dev->refcount))
285 complete(&cma_dev->comp);
286 }
287
288 static void cma_detach_from_dev(struct rdma_id_private *id_priv)
289 {
290 list_del(&id_priv->list);
291 cma_deref_dev(id_priv->cma_dev);
292 id_priv->cma_dev = NULL;
293 }
294
295 static int cma_set_qkey(struct ib_device *device, u8 port_num,
296 enum rdma_port_space ps,
297 struct rdma_dev_addr *dev_addr, u32 *qkey)
298 {
299 struct ib_sa_mcmember_rec rec;
300 int ret = 0;
301
302 switch (ps) {
303 case RDMA_PS_UDP:
304 *qkey = RDMA_UDP_QKEY;
305 break;
306 case RDMA_PS_IPOIB:
307 ib_addr_get_mgid(dev_addr, &rec.mgid);
308 ret = ib_sa_get_mcmember_rec(device, port_num, &rec.mgid, &rec);
309 *qkey = be32_to_cpu(rec.qkey);
310 break;
311 default:
312 break;
313 }
314 return ret;
315 }
316
317 static int cma_acquire_dev(struct rdma_id_private *id_priv)
318 {
319 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
320 struct cma_device *cma_dev;
321 union ib_gid gid;
322 int ret = -ENODEV;
323
324 switch (rdma_node_get_transport(dev_addr->dev_type)) {
325 case RDMA_TRANSPORT_IB:
326 ib_addr_get_sgid(dev_addr, &gid);
327 break;
328 case RDMA_TRANSPORT_IWARP:
329 iw_addr_get_sgid(dev_addr, &gid);
330 break;
331 default:
332 return -ENODEV;
333 }
334
335 list_for_each_entry(cma_dev, &dev_list, list) {
336 ret = ib_find_cached_gid(cma_dev->device, &gid,
337 &id_priv->id.port_num, NULL);
338 if (!ret) {
339 ret = cma_set_qkey(cma_dev->device,
340 id_priv->id.port_num,
341 id_priv->id.ps, dev_addr,
342 &id_priv->qkey);
343 if (!ret)
344 cma_attach_to_dev(id_priv, cma_dev);
345 break;
346 }
347 }
348 return ret;
349 }
350
351 static void cma_deref_id(struct rdma_id_private *id_priv)
352 {
353 if (atomic_dec_and_test(&id_priv->refcount))
354 complete(&id_priv->comp);
355 }
356
357 static int cma_disable_callback(struct rdma_id_private *id_priv,
358 enum cma_state state)
359 {
360 mutex_lock(&id_priv->handler_mutex);
361 if (id_priv->state != state) {
362 mutex_unlock(&id_priv->handler_mutex);
363 return -EINVAL;
364 }
365 return 0;
366 }
367
368 static int cma_has_cm_dev(struct rdma_id_private *id_priv)
369 {
370 return (id_priv->id.device && id_priv->cm_id.ib);
371 }
372
373 struct rdma_cm_id *rdma_create_id(rdma_cm_event_handler event_handler,
374 void *context, enum rdma_port_space ps)
375 {
376 struct rdma_id_private *id_priv;
377
378 id_priv = kzalloc(sizeof *id_priv, GFP_KERNEL);
379 if (!id_priv)
380 return ERR_PTR(-ENOMEM);
381
382 id_priv->state = CMA_IDLE;
383 id_priv->id.context = context;
384 id_priv->id.event_handler = event_handler;
385 id_priv->id.ps = ps;
386 spin_lock_init(&id_priv->lock);
387 mutex_init(&id_priv->qp_mutex);
388 init_completion(&id_priv->comp);
389 atomic_set(&id_priv->refcount, 1);
390 mutex_init(&id_priv->handler_mutex);
391 INIT_LIST_HEAD(&id_priv->listen_list);
392 INIT_LIST_HEAD(&id_priv->mc_list);
393 get_random_bytes(&id_priv->seq_num, sizeof id_priv->seq_num);
394
395 return &id_priv->id;
396 }
397 EXPORT_SYMBOL(rdma_create_id);
398
399 static int cma_init_ud_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
400 {
401 struct ib_qp_attr qp_attr;
402 int qp_attr_mask, ret;
403
404 qp_attr.qp_state = IB_QPS_INIT;
405 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
406 if (ret)
407 return ret;
408
409 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
410 if (ret)
411 return ret;
412
413 qp_attr.qp_state = IB_QPS_RTR;
414 ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE);
415 if (ret)
416 return ret;
417
418 qp_attr.qp_state = IB_QPS_RTS;
419 qp_attr.sq_psn = 0;
420 ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE | IB_QP_SQ_PSN);
421
422 return ret;
423 }
424
425 static int cma_init_conn_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
426 {
427 struct ib_qp_attr qp_attr;
428 int qp_attr_mask, ret;
429
430 qp_attr.qp_state = IB_QPS_INIT;
431 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
432 if (ret)
433 return ret;
434
435 return ib_modify_qp(qp, &qp_attr, qp_attr_mask);
436 }
437
438 int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd,
439 struct ib_qp_init_attr *qp_init_attr)
440 {
441 struct rdma_id_private *id_priv;
442 struct ib_qp *qp;
443 int ret;
444
445 id_priv = container_of(id, struct rdma_id_private, id);
446 if (id->device != pd->device)
447 return -EINVAL;
448
449 qp = ib_create_qp(pd, qp_init_attr);
450 if (IS_ERR(qp))
451 return PTR_ERR(qp);
452
453 if (cma_is_ud_ps(id_priv->id.ps))
454 ret = cma_init_ud_qp(id_priv, qp);
455 else
456 ret = cma_init_conn_qp(id_priv, qp);
457 if (ret)
458 goto err;
459
460 id->qp = qp;
461 id_priv->qp_num = qp->qp_num;
462 id_priv->srq = (qp->srq != NULL);
463 return 0;
464 err:
465 ib_destroy_qp(qp);
466 return ret;
467 }
468 EXPORT_SYMBOL(rdma_create_qp);
469
470 void rdma_destroy_qp(struct rdma_cm_id *id)
471 {
472 struct rdma_id_private *id_priv;
473
474 id_priv = container_of(id, struct rdma_id_private, id);
475 mutex_lock(&id_priv->qp_mutex);
476 ib_destroy_qp(id_priv->id.qp);
477 id_priv->id.qp = NULL;
478 mutex_unlock(&id_priv->qp_mutex);
479 }
480 EXPORT_SYMBOL(rdma_destroy_qp);
481
482 static int cma_modify_qp_rtr(struct rdma_id_private *id_priv,
483 struct rdma_conn_param *conn_param)
484 {
485 struct ib_qp_attr qp_attr;
486 int qp_attr_mask, ret;
487
488 mutex_lock(&id_priv->qp_mutex);
489 if (!id_priv->id.qp) {
490 ret = 0;
491 goto out;
492 }
493
494 /* Need to update QP attributes from default values. */
495 qp_attr.qp_state = IB_QPS_INIT;
496 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
497 if (ret)
498 goto out;
499
500 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
501 if (ret)
502 goto out;
503
504 qp_attr.qp_state = IB_QPS_RTR;
505 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
506 if (ret)
507 goto out;
508
509 if (conn_param)
510 qp_attr.max_dest_rd_atomic = conn_param->responder_resources;
511 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
512 out:
513 mutex_unlock(&id_priv->qp_mutex);
514 return ret;
515 }
516
517 static int cma_modify_qp_rts(struct rdma_id_private *id_priv,
518 struct rdma_conn_param *conn_param)
519 {
520 struct ib_qp_attr qp_attr;
521 int qp_attr_mask, ret;
522
523 mutex_lock(&id_priv->qp_mutex);
524 if (!id_priv->id.qp) {
525 ret = 0;
526 goto out;
527 }
528
529 qp_attr.qp_state = IB_QPS_RTS;
530 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
531 if (ret)
532 goto out;
533
534 if (conn_param)
535 qp_attr.max_rd_atomic = conn_param->initiator_depth;
536 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
537 out:
538 mutex_unlock(&id_priv->qp_mutex);
539 return ret;
540 }
541
542 static int cma_modify_qp_err(struct rdma_id_private *id_priv)
543 {
544 struct ib_qp_attr qp_attr;
545 int ret;
546
547 mutex_lock(&id_priv->qp_mutex);
548 if (!id_priv->id.qp) {
549 ret = 0;
550 goto out;
551 }
552
553 qp_attr.qp_state = IB_QPS_ERR;
554 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, IB_QP_STATE);
555 out:
556 mutex_unlock(&id_priv->qp_mutex);
557 return ret;
558 }
559
560 static int cma_ib_init_qp_attr(struct rdma_id_private *id_priv,
561 struct ib_qp_attr *qp_attr, int *qp_attr_mask)
562 {
563 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
564 int ret;
565
566 ret = ib_find_cached_pkey(id_priv->id.device, id_priv->id.port_num,
567 ib_addr_get_pkey(dev_addr),
568 &qp_attr->pkey_index);
569 if (ret)
570 return ret;
571
572 qp_attr->port_num = id_priv->id.port_num;
573 *qp_attr_mask = IB_QP_STATE | IB_QP_PKEY_INDEX | IB_QP_PORT;
574
575 if (cma_is_ud_ps(id_priv->id.ps)) {
576 qp_attr->qkey = id_priv->qkey;
577 *qp_attr_mask |= IB_QP_QKEY;
578 } else {
579 qp_attr->qp_access_flags = 0;
580 *qp_attr_mask |= IB_QP_ACCESS_FLAGS;
581 }
582 return 0;
583 }
584
585 int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
586 int *qp_attr_mask)
587 {
588 struct rdma_id_private *id_priv;
589 int ret = 0;
590
591 id_priv = container_of(id, struct rdma_id_private, id);
592 switch (rdma_node_get_transport(id_priv->id.device->node_type)) {
593 case RDMA_TRANSPORT_IB:
594 if (!id_priv->cm_id.ib || cma_is_ud_ps(id_priv->id.ps))
595 ret = cma_ib_init_qp_attr(id_priv, qp_attr, qp_attr_mask);
596 else
597 ret = ib_cm_init_qp_attr(id_priv->cm_id.ib, qp_attr,
598 qp_attr_mask);
599 if (qp_attr->qp_state == IB_QPS_RTR)
600 qp_attr->rq_psn = id_priv->seq_num;
601 break;
602 case RDMA_TRANSPORT_IWARP:
603 if (!id_priv->cm_id.iw) {
604 qp_attr->qp_access_flags = 0;
605 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS;
606 } else
607 ret = iw_cm_init_qp_attr(id_priv->cm_id.iw, qp_attr,
608 qp_attr_mask);
609 break;
610 default:
611 ret = -ENOSYS;
612 break;
613 }
614
615 return ret;
616 }
617 EXPORT_SYMBOL(rdma_init_qp_attr);
618
619 static inline int cma_zero_addr(struct sockaddr *addr)
620 {
621 struct in6_addr *ip6;
622
623 if (addr->sa_family == AF_INET)
624 return ipv4_is_zeronet(
625 ((struct sockaddr_in *)addr)->sin_addr.s_addr);
626 else {
627 ip6 = &((struct sockaddr_in6 *) addr)->sin6_addr;
628 return (ip6->s6_addr32[0] | ip6->s6_addr32[1] |
629 ip6->s6_addr32[2] | ip6->s6_addr32[3]) == 0;
630 }
631 }
632
633 static inline int cma_loopback_addr(struct sockaddr *addr)
634 {
635 return ipv4_is_loopback(((struct sockaddr_in *) addr)->sin_addr.s_addr);
636 }
637
638 static inline int cma_any_addr(struct sockaddr *addr)
639 {
640 return cma_zero_addr(addr) || cma_loopback_addr(addr);
641 }
642
643 static inline __be16 cma_port(struct sockaddr *addr)
644 {
645 if (addr->sa_family == AF_INET)
646 return ((struct sockaddr_in *) addr)->sin_port;
647 else
648 return ((struct sockaddr_in6 *) addr)->sin6_port;
649 }
650
651 static inline int cma_any_port(struct sockaddr *addr)
652 {
653 return !cma_port(addr);
654 }
655
656 static int cma_get_net_info(void *hdr, enum rdma_port_space ps,
657 u8 *ip_ver, __be16 *port,
658 union cma_ip_addr **src, union cma_ip_addr **dst)
659 {
660 switch (ps) {
661 case RDMA_PS_SDP:
662 if (sdp_get_majv(((struct sdp_hh *) hdr)->sdp_version) !=
663 SDP_MAJ_VERSION)
664 return -EINVAL;
665
666 *ip_ver = sdp_get_ip_ver(hdr);
667 *port = ((struct sdp_hh *) hdr)->port;
668 *src = &((struct sdp_hh *) hdr)->src_addr;
669 *dst = &((struct sdp_hh *) hdr)->dst_addr;
670 break;
671 default:
672 if (((struct cma_hdr *) hdr)->cma_version != CMA_VERSION)
673 return -EINVAL;
674
675 *ip_ver = cma_get_ip_ver(hdr);
676 *port = ((struct cma_hdr *) hdr)->port;
677 *src = &((struct cma_hdr *) hdr)->src_addr;
678 *dst = &((struct cma_hdr *) hdr)->dst_addr;
679 break;
680 }
681
682 if (*ip_ver != 4 && *ip_ver != 6)
683 return -EINVAL;
684 return 0;
685 }
686
687 static void cma_save_net_info(struct rdma_addr *addr,
688 struct rdma_addr *listen_addr,
689 u8 ip_ver, __be16 port,
690 union cma_ip_addr *src, union cma_ip_addr *dst)
691 {
692 struct sockaddr_in *listen4, *ip4;
693 struct sockaddr_in6 *listen6, *ip6;
694
695 switch (ip_ver) {
696 case 4:
697 listen4 = (struct sockaddr_in *) &listen_addr->src_addr;
698 ip4 = (struct sockaddr_in *) &addr->src_addr;
699 ip4->sin_family = listen4->sin_family;
700 ip4->sin_addr.s_addr = dst->ip4.addr;
701 ip4->sin_port = listen4->sin_port;
702
703 ip4 = (struct sockaddr_in *) &addr->dst_addr;
704 ip4->sin_family = listen4->sin_family;
705 ip4->sin_addr.s_addr = src->ip4.addr;
706 ip4->sin_port = port;
707 break;
708 case 6:
709 listen6 = (struct sockaddr_in6 *) &listen_addr->src_addr;
710 ip6 = (struct sockaddr_in6 *) &addr->src_addr;
711 ip6->sin6_family = listen6->sin6_family;
712 ip6->sin6_addr = dst->ip6;
713 ip6->sin6_port = listen6->sin6_port;
714
715 ip6 = (struct sockaddr_in6 *) &addr->dst_addr;
716 ip6->sin6_family = listen6->sin6_family;
717 ip6->sin6_addr = src->ip6;
718 ip6->sin6_port = port;
719 break;
720 default:
721 break;
722 }
723 }
724
725 static inline int cma_user_data_offset(enum rdma_port_space ps)
726 {
727 switch (ps) {
728 case RDMA_PS_SDP:
729 return 0;
730 default:
731 return sizeof(struct cma_hdr);
732 }
733 }
734
735 static void cma_cancel_route(struct rdma_id_private *id_priv)
736 {
737 switch (rdma_node_get_transport(id_priv->id.device->node_type)) {
738 case RDMA_TRANSPORT_IB:
739 if (id_priv->query)
740 ib_sa_cancel_query(id_priv->query_id, id_priv->query);
741 break;
742 default:
743 break;
744 }
745 }
746
747 static void cma_cancel_listens(struct rdma_id_private *id_priv)
748 {
749 struct rdma_id_private *dev_id_priv;
750
751 /*
752 * Remove from listen_any_list to prevent added devices from spawning
753 * additional listen requests.
754 */
755 mutex_lock(&lock);
756 list_del(&id_priv->list);
757
758 while (!list_empty(&id_priv->listen_list)) {
759 dev_id_priv = list_entry(id_priv->listen_list.next,
760 struct rdma_id_private, listen_list);
761 /* sync with device removal to avoid duplicate destruction */
762 list_del_init(&dev_id_priv->list);
763 list_del(&dev_id_priv->listen_list);
764 mutex_unlock(&lock);
765
766 rdma_destroy_id(&dev_id_priv->id);
767 mutex_lock(&lock);
768 }
769 mutex_unlock(&lock);
770 }
771
772 static void cma_cancel_operation(struct rdma_id_private *id_priv,
773 enum cma_state state)
774 {
775 switch (state) {
776 case CMA_ADDR_QUERY:
777 rdma_addr_cancel(&id_priv->id.route.addr.dev_addr);
778 break;
779 case CMA_ROUTE_QUERY:
780 cma_cancel_route(id_priv);
781 break;
782 case CMA_LISTEN:
783 if (cma_any_addr(&id_priv->id.route.addr.src_addr) &&
784 !id_priv->cma_dev)
785 cma_cancel_listens(id_priv);
786 break;
787 default:
788 break;
789 }
790 }
791
792 static void cma_release_port(struct rdma_id_private *id_priv)
793 {
794 struct rdma_bind_list *bind_list = id_priv->bind_list;
795
796 if (!bind_list)
797 return;
798
799 mutex_lock(&lock);
800 hlist_del(&id_priv->node);
801 if (hlist_empty(&bind_list->owners)) {
802 idr_remove(bind_list->ps, bind_list->port);
803 kfree(bind_list);
804 }
805 mutex_unlock(&lock);
806 }
807
808 static void cma_leave_mc_groups(struct rdma_id_private *id_priv)
809 {
810 struct cma_multicast *mc;
811
812 while (!list_empty(&id_priv->mc_list)) {
813 mc = container_of(id_priv->mc_list.next,
814 struct cma_multicast, list);
815 list_del(&mc->list);
816 ib_sa_free_multicast(mc->multicast.ib);
817 kfree(mc);
818 }
819 }
820
821 void rdma_destroy_id(struct rdma_cm_id *id)
822 {
823 struct rdma_id_private *id_priv;
824 enum cma_state state;
825
826 id_priv = container_of(id, struct rdma_id_private, id);
827 state = cma_exch(id_priv, CMA_DESTROYING);
828 cma_cancel_operation(id_priv, state);
829
830 mutex_lock(&lock);
831 if (id_priv->cma_dev) {
832 mutex_unlock(&lock);
833 switch (rdma_node_get_transport(id->device->node_type)) {
834 case RDMA_TRANSPORT_IB:
835 if (id_priv->cm_id.ib && !IS_ERR(id_priv->cm_id.ib))
836 ib_destroy_cm_id(id_priv->cm_id.ib);
837 break;
838 case RDMA_TRANSPORT_IWARP:
839 if (id_priv->cm_id.iw && !IS_ERR(id_priv->cm_id.iw))
840 iw_destroy_cm_id(id_priv->cm_id.iw);
841 break;
842 default:
843 break;
844 }
845 cma_leave_mc_groups(id_priv);
846 mutex_lock(&lock);
847 cma_detach_from_dev(id_priv);
848 }
849 mutex_unlock(&lock);
850
851 cma_release_port(id_priv);
852 cma_deref_id(id_priv);
853 wait_for_completion(&id_priv->comp);
854
855 if (id_priv->internal_id)
856 cma_deref_id(id_priv->id.context);
857
858 kfree(id_priv->id.route.path_rec);
859 kfree(id_priv);
860 }
861 EXPORT_SYMBOL(rdma_destroy_id);
862
863 static int cma_rep_recv(struct rdma_id_private *id_priv)
864 {
865 int ret;
866
867 ret = cma_modify_qp_rtr(id_priv, NULL);
868 if (ret)
869 goto reject;
870
871 ret = cma_modify_qp_rts(id_priv, NULL);
872 if (ret)
873 goto reject;
874
875 ret = ib_send_cm_rtu(id_priv->cm_id.ib, NULL, 0);
876 if (ret)
877 goto reject;
878
879 return 0;
880 reject:
881 cma_modify_qp_err(id_priv);
882 ib_send_cm_rej(id_priv->cm_id.ib, IB_CM_REJ_CONSUMER_DEFINED,
883 NULL, 0, NULL, 0);
884 return ret;
885 }
886
887 static int cma_verify_rep(struct rdma_id_private *id_priv, void *data)
888 {
889 if (id_priv->id.ps == RDMA_PS_SDP &&
890 sdp_get_majv(((struct sdp_hah *) data)->sdp_version) !=
891 SDP_MAJ_VERSION)
892 return -EINVAL;
893
894 return 0;
895 }
896
897 static void cma_set_rep_event_data(struct rdma_cm_event *event,
898 struct ib_cm_rep_event_param *rep_data,
899 void *private_data)
900 {
901 event->param.conn.private_data = private_data;
902 event->param.conn.private_data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
903 event->param.conn.responder_resources = rep_data->responder_resources;
904 event->param.conn.initiator_depth = rep_data->initiator_depth;
905 event->param.conn.flow_control = rep_data->flow_control;
906 event->param.conn.rnr_retry_count = rep_data->rnr_retry_count;
907 event->param.conn.srq = rep_data->srq;
908 event->param.conn.qp_num = rep_data->remote_qpn;
909 }
910
911 static int cma_ib_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
912 {
913 struct rdma_id_private *id_priv = cm_id->context;
914 struct rdma_cm_event event;
915 int ret = 0;
916
917 if (cma_disable_callback(id_priv, CMA_CONNECT))
918 return 0;
919
920 memset(&event, 0, sizeof event);
921 switch (ib_event->event) {
922 case IB_CM_REQ_ERROR:
923 case IB_CM_REP_ERROR:
924 event.event = RDMA_CM_EVENT_UNREACHABLE;
925 event.status = -ETIMEDOUT;
926 break;
927 case IB_CM_REP_RECEIVED:
928 event.status = cma_verify_rep(id_priv, ib_event->private_data);
929 if (event.status)
930 event.event = RDMA_CM_EVENT_CONNECT_ERROR;
931 else if (id_priv->id.qp && id_priv->id.ps != RDMA_PS_SDP) {
932 event.status = cma_rep_recv(id_priv);
933 event.event = event.status ? RDMA_CM_EVENT_CONNECT_ERROR :
934 RDMA_CM_EVENT_ESTABLISHED;
935 } else
936 event.event = RDMA_CM_EVENT_CONNECT_RESPONSE;
937 cma_set_rep_event_data(&event, &ib_event->param.rep_rcvd,
938 ib_event->private_data);
939 break;
940 case IB_CM_RTU_RECEIVED:
941 case IB_CM_USER_ESTABLISHED:
942 event.event = RDMA_CM_EVENT_ESTABLISHED;
943 break;
944 case IB_CM_DREQ_ERROR:
945 event.status = -ETIMEDOUT; /* fall through */
946 case IB_CM_DREQ_RECEIVED:
947 case IB_CM_DREP_RECEIVED:
948 if (!cma_comp_exch(id_priv, CMA_CONNECT, CMA_DISCONNECT))
949 goto out;
950 event.event = RDMA_CM_EVENT_DISCONNECTED;
951 break;
952 case IB_CM_TIMEWAIT_EXIT:
953 case IB_CM_MRA_RECEIVED:
954 /* ignore event */
955 goto out;
956 case IB_CM_REJ_RECEIVED:
957 cma_modify_qp_err(id_priv);
958 event.status = ib_event->param.rej_rcvd.reason;
959 event.event = RDMA_CM_EVENT_REJECTED;
960 event.param.conn.private_data = ib_event->private_data;
961 event.param.conn.private_data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
962 break;
963 default:
964 printk(KERN_ERR "RDMA CMA: unexpected IB CM event: %d\n",
965 ib_event->event);
966 goto out;
967 }
968
969 ret = id_priv->id.event_handler(&id_priv->id, &event);
970 if (ret) {
971 /* Destroy the CM ID by returning a non-zero value. */
972 id_priv->cm_id.ib = NULL;
973 cma_exch(id_priv, CMA_DESTROYING);
974 mutex_unlock(&id_priv->handler_mutex);
975 rdma_destroy_id(&id_priv->id);
976 return ret;
977 }
978 out:
979 mutex_unlock(&id_priv->handler_mutex);
980 return ret;
981 }
982
983 static struct rdma_id_private *cma_new_conn_id(struct rdma_cm_id *listen_id,
984 struct ib_cm_event *ib_event)
985 {
986 struct rdma_id_private *id_priv;
987 struct rdma_cm_id *id;
988 struct rdma_route *rt;
989 union cma_ip_addr *src, *dst;
990 __be16 port;
991 u8 ip_ver;
992 int ret;
993
994 if (cma_get_net_info(ib_event->private_data, listen_id->ps,
995 &ip_ver, &port, &src, &dst))
996 goto err;
997
998 id = rdma_create_id(listen_id->event_handler, listen_id->context,
999 listen_id->ps);
1000 if (IS_ERR(id))
1001 goto err;
1002
1003 cma_save_net_info(&id->route.addr, &listen_id->route.addr,
1004 ip_ver, port, src, dst);
1005
1006 rt = &id->route;
1007 rt->num_paths = ib_event->param.req_rcvd.alternate_path ? 2 : 1;
1008 rt->path_rec = kmalloc(sizeof *rt->path_rec * rt->num_paths,
1009 GFP_KERNEL);
1010 if (!rt->path_rec)
1011 goto destroy_id;
1012
1013 rt->path_rec[0] = *ib_event->param.req_rcvd.primary_path;
1014 if (rt->num_paths == 2)
1015 rt->path_rec[1] = *ib_event->param.req_rcvd.alternate_path;
1016
1017 ib_addr_set_dgid(&rt->addr.dev_addr, &rt->path_rec[0].dgid);
1018 ret = rdma_translate_ip(&id->route.addr.src_addr,
1019 &id->route.addr.dev_addr);
1020 if (ret)
1021 goto destroy_id;
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 __be16 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_callback(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 conn_id = cma_new_conn_id(&listen_id->id, ib_event);
1104 cma_set_req_event_data(&event, &ib_event->param.req_rcvd,
1105 ib_event->private_data, offset);
1106 }
1107 if (!conn_id) {
1108 ret = -ENOMEM;
1109 goto out;
1110 }
1111
1112 mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
1113 mutex_lock(&lock);
1114 ret = cma_acquire_dev(conn_id);
1115 mutex_unlock(&lock);
1116 if (ret)
1117 goto release_conn_id;
1118
1119 conn_id->cm_id.ib = cm_id;
1120 cm_id->context = conn_id;
1121 cm_id->cm_handler = cma_ib_handler;
1122
1123 ret = conn_id->id.event_handler(&conn_id->id, &event);
1124 if (!ret) {
1125 /*
1126 * Acquire mutex to prevent user executing rdma_destroy_id()
1127 * while we're accessing the cm_id.
1128 */
1129 mutex_lock(&lock);
1130 if (cma_comp(conn_id, CMA_CONNECT) &&
1131 !cma_is_ud_ps(conn_id->id.ps))
1132 ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0);
1133 mutex_unlock(&lock);
1134 mutex_unlock(&conn_id->handler_mutex);
1135 goto out;
1136 }
1137
1138 /* Destroy the CM ID by returning a non-zero value. */
1139 conn_id->cm_id.ib = NULL;
1140
1141 release_conn_id:
1142 cma_exch(conn_id, CMA_DESTROYING);
1143 mutex_unlock(&conn_id->handler_mutex);
1144 rdma_destroy_id(&conn_id->id);
1145
1146 out:
1147 mutex_unlock(&listen_id->handler_mutex);
1148 return ret;
1149 }
1150
1151 static __be64 cma_get_service_id(enum rdma_port_space ps, struct sockaddr *addr)
1152 {
1153 return cpu_to_be64(((u64)ps << 16) + be16_to_cpu(cma_port(addr)));
1154 }
1155
1156 static void cma_set_compare_data(enum rdma_port_space ps, struct sockaddr *addr,
1157 struct ib_cm_compare_data *compare)
1158 {
1159 struct cma_hdr *cma_data, *cma_mask;
1160 struct sdp_hh *sdp_data, *sdp_mask;
1161 __be32 ip4_addr;
1162 struct in6_addr ip6_addr;
1163
1164 memset(compare, 0, sizeof *compare);
1165 cma_data = (void *) compare->data;
1166 cma_mask = (void *) compare->mask;
1167 sdp_data = (void *) compare->data;
1168 sdp_mask = (void *) compare->mask;
1169
1170 switch (addr->sa_family) {
1171 case AF_INET:
1172 ip4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
1173 if (ps == RDMA_PS_SDP) {
1174 sdp_set_ip_ver(sdp_data, 4);
1175 sdp_set_ip_ver(sdp_mask, 0xF);
1176 sdp_data->dst_addr.ip4.addr = ip4_addr;
1177 sdp_mask->dst_addr.ip4.addr = htonl(~0);
1178 } else {
1179 cma_set_ip_ver(cma_data, 4);
1180 cma_set_ip_ver(cma_mask, 0xF);
1181 cma_data->dst_addr.ip4.addr = ip4_addr;
1182 cma_mask->dst_addr.ip4.addr = htonl(~0);
1183 }
1184 break;
1185 case AF_INET6:
1186 ip6_addr = ((struct sockaddr_in6 *) addr)->sin6_addr;
1187 if (ps == RDMA_PS_SDP) {
1188 sdp_set_ip_ver(sdp_data, 6);
1189 sdp_set_ip_ver(sdp_mask, 0xF);
1190 sdp_data->dst_addr.ip6 = ip6_addr;
1191 memset(&sdp_mask->dst_addr.ip6, 0xFF,
1192 sizeof sdp_mask->dst_addr.ip6);
1193 } else {
1194 cma_set_ip_ver(cma_data, 6);
1195 cma_set_ip_ver(cma_mask, 0xF);
1196 cma_data->dst_addr.ip6 = ip6_addr;
1197 memset(&cma_mask->dst_addr.ip6, 0xFF,
1198 sizeof cma_mask->dst_addr.ip6);
1199 }
1200 break;
1201 default:
1202 break;
1203 }
1204 }
1205
1206 static int cma_iw_handler(struct iw_cm_id *iw_id, struct iw_cm_event *iw_event)
1207 {
1208 struct rdma_id_private *id_priv = iw_id->context;
1209 struct rdma_cm_event event;
1210 struct sockaddr_in *sin;
1211 int ret = 0;
1212
1213 if (cma_disable_callback(id_priv, CMA_CONNECT))
1214 return 0;
1215
1216 memset(&event, 0, sizeof event);
1217 switch (iw_event->event) {
1218 case IW_CM_EVENT_CLOSE:
1219 event.event = RDMA_CM_EVENT_DISCONNECTED;
1220 break;
1221 case IW_CM_EVENT_CONNECT_REPLY:
1222 sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
1223 *sin = iw_event->local_addr;
1224 sin = (struct sockaddr_in *) &id_priv->id.route.addr.dst_addr;
1225 *sin = iw_event->remote_addr;
1226 switch (iw_event->status) {
1227 case 0:
1228 event.event = RDMA_CM_EVENT_ESTABLISHED;
1229 break;
1230 case -ECONNRESET:
1231 case -ECONNREFUSED:
1232 event.event = RDMA_CM_EVENT_REJECTED;
1233 break;
1234 case -ETIMEDOUT:
1235 event.event = RDMA_CM_EVENT_UNREACHABLE;
1236 break;
1237 default:
1238 event.event = RDMA_CM_EVENT_CONNECT_ERROR;
1239 break;
1240 }
1241 break;
1242 case IW_CM_EVENT_ESTABLISHED:
1243 event.event = RDMA_CM_EVENT_ESTABLISHED;
1244 break;
1245 default:
1246 BUG_ON(1);
1247 }
1248
1249 event.status = iw_event->status;
1250 event.param.conn.private_data = iw_event->private_data;
1251 event.param.conn.private_data_len = iw_event->private_data_len;
1252 ret = id_priv->id.event_handler(&id_priv->id, &event);
1253 if (ret) {
1254 /* Destroy the CM ID by returning a non-zero value. */
1255 id_priv->cm_id.iw = NULL;
1256 cma_exch(id_priv, CMA_DESTROYING);
1257 mutex_unlock(&id_priv->handler_mutex);
1258 rdma_destroy_id(&id_priv->id);
1259 return ret;
1260 }
1261
1262 mutex_unlock(&id_priv->handler_mutex);
1263 return ret;
1264 }
1265
1266 static int iw_conn_req_handler(struct iw_cm_id *cm_id,
1267 struct iw_cm_event *iw_event)
1268 {
1269 struct rdma_cm_id *new_cm_id;
1270 struct rdma_id_private *listen_id, *conn_id;
1271 struct sockaddr_in *sin;
1272 struct net_device *dev = NULL;
1273 struct rdma_cm_event event;
1274 int ret;
1275 struct ib_device_attr attr;
1276
1277 listen_id = cm_id->context;
1278 if (cma_disable_callback(listen_id, CMA_LISTEN))
1279 return -ECONNABORTED;
1280
1281 /* Create a new RDMA id for the new IW CM ID */
1282 new_cm_id = rdma_create_id(listen_id->id.event_handler,
1283 listen_id->id.context,
1284 RDMA_PS_TCP);
1285 if (IS_ERR(new_cm_id)) {
1286 ret = -ENOMEM;
1287 goto out;
1288 }
1289 conn_id = container_of(new_cm_id, struct rdma_id_private, id);
1290 mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
1291 conn_id->state = CMA_CONNECT;
1292
1293 dev = ip_dev_find(&init_net, iw_event->local_addr.sin_addr.s_addr);
1294 if (!dev) {
1295 ret = -EADDRNOTAVAIL;
1296 mutex_unlock(&conn_id->handler_mutex);
1297 rdma_destroy_id(new_cm_id);
1298 goto out;
1299 }
1300 ret = rdma_copy_addr(&conn_id->id.route.addr.dev_addr, dev, NULL);
1301 if (ret) {
1302 mutex_unlock(&conn_id->handler_mutex);
1303 rdma_destroy_id(new_cm_id);
1304 goto out;
1305 }
1306
1307 mutex_lock(&lock);
1308 ret = cma_acquire_dev(conn_id);
1309 mutex_unlock(&lock);
1310 if (ret) {
1311 mutex_unlock(&conn_id->handler_mutex);
1312 rdma_destroy_id(new_cm_id);
1313 goto out;
1314 }
1315
1316 conn_id->cm_id.iw = cm_id;
1317 cm_id->context = conn_id;
1318 cm_id->cm_handler = cma_iw_handler;
1319
1320 sin = (struct sockaddr_in *) &new_cm_id->route.addr.src_addr;
1321 *sin = iw_event->local_addr;
1322 sin = (struct sockaddr_in *) &new_cm_id->route.addr.dst_addr;
1323 *sin = iw_event->remote_addr;
1324
1325 ret = ib_query_device(conn_id->id.device, &attr);
1326 if (ret) {
1327 mutex_unlock(&conn_id->handler_mutex);
1328 rdma_destroy_id(new_cm_id);
1329 goto out;
1330 }
1331
1332 memset(&event, 0, sizeof event);
1333 event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
1334 event.param.conn.private_data = iw_event->private_data;
1335 event.param.conn.private_data_len = iw_event->private_data_len;
1336 event.param.conn.initiator_depth = attr.max_qp_init_rd_atom;
1337 event.param.conn.responder_resources = attr.max_qp_rd_atom;
1338 ret = conn_id->id.event_handler(&conn_id->id, &event);
1339 if (ret) {
1340 /* User wants to destroy the CM ID */
1341 conn_id->cm_id.iw = NULL;
1342 cma_exch(conn_id, CMA_DESTROYING);
1343 mutex_unlock(&conn_id->handler_mutex);
1344 rdma_destroy_id(&conn_id->id);
1345 goto out;
1346 }
1347
1348 mutex_unlock(&conn_id->handler_mutex);
1349
1350 out:
1351 if (dev)
1352 dev_put(dev);
1353 mutex_unlock(&listen_id->handler_mutex);
1354 return ret;
1355 }
1356
1357 static int cma_ib_listen(struct rdma_id_private *id_priv)
1358 {
1359 struct ib_cm_compare_data compare_data;
1360 struct sockaddr *addr;
1361 __be64 svc_id;
1362 int ret;
1363
1364 id_priv->cm_id.ib = ib_create_cm_id(id_priv->id.device, cma_req_handler,
1365 id_priv);
1366 if (IS_ERR(id_priv->cm_id.ib))
1367 return PTR_ERR(id_priv->cm_id.ib);
1368
1369 addr = &id_priv->id.route.addr.src_addr;
1370 svc_id = cma_get_service_id(id_priv->id.ps, addr);
1371 if (cma_any_addr(addr))
1372 ret = ib_cm_listen(id_priv->cm_id.ib, svc_id, 0, NULL);
1373 else {
1374 cma_set_compare_data(id_priv->id.ps, addr, &compare_data);
1375 ret = ib_cm_listen(id_priv->cm_id.ib, svc_id, 0, &compare_data);
1376 }
1377
1378 if (ret) {
1379 ib_destroy_cm_id(id_priv->cm_id.ib);
1380 id_priv->cm_id.ib = NULL;
1381 }
1382
1383 return ret;
1384 }
1385
1386 static int cma_iw_listen(struct rdma_id_private *id_priv, int backlog)
1387 {
1388 int ret;
1389 struct sockaddr_in *sin;
1390
1391 id_priv->cm_id.iw = iw_create_cm_id(id_priv->id.device,
1392 iw_conn_req_handler,
1393 id_priv);
1394 if (IS_ERR(id_priv->cm_id.iw))
1395 return PTR_ERR(id_priv->cm_id.iw);
1396
1397 sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
1398 id_priv->cm_id.iw->local_addr = *sin;
1399
1400 ret = iw_cm_listen(id_priv->cm_id.iw, backlog);
1401
1402 if (ret) {
1403 iw_destroy_cm_id(id_priv->cm_id.iw);
1404 id_priv->cm_id.iw = NULL;
1405 }
1406
1407 return ret;
1408 }
1409
1410 static int cma_listen_handler(struct rdma_cm_id *id,
1411 struct rdma_cm_event *event)
1412 {
1413 struct rdma_id_private *id_priv = id->context;
1414
1415 id->context = id_priv->id.context;
1416 id->event_handler = id_priv->id.event_handler;
1417 return id_priv->id.event_handler(id, event);
1418 }
1419
1420 static void cma_listen_on_dev(struct rdma_id_private *id_priv,
1421 struct cma_device *cma_dev)
1422 {
1423 struct rdma_id_private *dev_id_priv;
1424 struct rdma_cm_id *id;
1425 int ret;
1426
1427 id = rdma_create_id(cma_listen_handler, id_priv, id_priv->id.ps);
1428 if (IS_ERR(id))
1429 return;
1430
1431 dev_id_priv = container_of(id, struct rdma_id_private, id);
1432
1433 dev_id_priv->state = CMA_ADDR_BOUND;
1434 memcpy(&id->route.addr.src_addr, &id_priv->id.route.addr.src_addr,
1435 ip_addr_size(&id_priv->id.route.addr.src_addr));
1436
1437 cma_attach_to_dev(dev_id_priv, cma_dev);
1438 list_add_tail(&dev_id_priv->listen_list, &id_priv->listen_list);
1439 atomic_inc(&id_priv->refcount);
1440 dev_id_priv->internal_id = 1;
1441
1442 ret = rdma_listen(id, id_priv->backlog);
1443 if (ret)
1444 printk(KERN_WARNING "RDMA CMA: cma_listen_on_dev, error %d, "
1445 "listening on device %s\n", ret, cma_dev->device->name);
1446 }
1447
1448 static void cma_listen_on_all(struct rdma_id_private *id_priv)
1449 {
1450 struct cma_device *cma_dev;
1451
1452 mutex_lock(&lock);
1453 list_add_tail(&id_priv->list, &listen_any_list);
1454 list_for_each_entry(cma_dev, &dev_list, list)
1455 cma_listen_on_dev(id_priv, cma_dev);
1456 mutex_unlock(&lock);
1457 }
1458
1459 static int cma_bind_any(struct rdma_cm_id *id, sa_family_t af)
1460 {
1461 struct sockaddr_in addr_in;
1462
1463 memset(&addr_in, 0, sizeof addr_in);
1464 addr_in.sin_family = af;
1465 return rdma_bind_addr(id, (struct sockaddr *) &addr_in);
1466 }
1467
1468 int rdma_listen(struct rdma_cm_id *id, int backlog)
1469 {
1470 struct rdma_id_private *id_priv;
1471 int ret;
1472
1473 id_priv = container_of(id, struct rdma_id_private, id);
1474 if (id_priv->state == CMA_IDLE) {
1475 ret = cma_bind_any(id, AF_INET);
1476 if (ret)
1477 return ret;
1478 }
1479
1480 if (!cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_LISTEN))
1481 return -EINVAL;
1482
1483 id_priv->backlog = backlog;
1484 if (id->device) {
1485 switch (rdma_node_get_transport(id->device->node_type)) {
1486 case RDMA_TRANSPORT_IB:
1487 ret = cma_ib_listen(id_priv);
1488 if (ret)
1489 goto err;
1490 break;
1491 case RDMA_TRANSPORT_IWARP:
1492 ret = cma_iw_listen(id_priv, backlog);
1493 if (ret)
1494 goto err;
1495 break;
1496 default:
1497 ret = -ENOSYS;
1498 goto err;
1499 }
1500 } else
1501 cma_listen_on_all(id_priv);
1502
1503 return 0;
1504 err:
1505 id_priv->backlog = 0;
1506 cma_comp_exch(id_priv, CMA_LISTEN, CMA_ADDR_BOUND);
1507 return ret;
1508 }
1509 EXPORT_SYMBOL(rdma_listen);
1510
1511 void rdma_set_service_type(struct rdma_cm_id *id, int tos)
1512 {
1513 struct rdma_id_private *id_priv;
1514
1515 id_priv = container_of(id, struct rdma_id_private, id);
1516 id_priv->tos = (u8) tos;
1517 }
1518 EXPORT_SYMBOL(rdma_set_service_type);
1519
1520 static void cma_query_handler(int status, struct ib_sa_path_rec *path_rec,
1521 void *context)
1522 {
1523 struct cma_work *work = context;
1524 struct rdma_route *route;
1525
1526 route = &work->id->id.route;
1527
1528 if (!status) {
1529 route->num_paths = 1;
1530 *route->path_rec = *path_rec;
1531 } else {
1532 work->old_state = CMA_ROUTE_QUERY;
1533 work->new_state = CMA_ADDR_RESOLVED;
1534 work->event.event = RDMA_CM_EVENT_ROUTE_ERROR;
1535 work->event.status = status;
1536 }
1537
1538 queue_work(cma_wq, &work->work);
1539 }
1540
1541 static int cma_query_ib_route(struct rdma_id_private *id_priv, int timeout_ms,
1542 struct cma_work *work)
1543 {
1544 struct rdma_addr *addr = &id_priv->id.route.addr;
1545 struct ib_sa_path_rec path_rec;
1546 ib_sa_comp_mask comp_mask;
1547 struct sockaddr_in6 *sin6;
1548
1549 memset(&path_rec, 0, sizeof path_rec);
1550 ib_addr_get_sgid(&addr->dev_addr, &path_rec.sgid);
1551 ib_addr_get_dgid(&addr->dev_addr, &path_rec.dgid);
1552 path_rec.pkey = cpu_to_be16(ib_addr_get_pkey(&addr->dev_addr));
1553 path_rec.numb_path = 1;
1554 path_rec.reversible = 1;
1555 path_rec.service_id = cma_get_service_id(id_priv->id.ps, &addr->dst_addr);
1556
1557 comp_mask = IB_SA_PATH_REC_DGID | IB_SA_PATH_REC_SGID |
1558 IB_SA_PATH_REC_PKEY | IB_SA_PATH_REC_NUMB_PATH |
1559 IB_SA_PATH_REC_REVERSIBLE | IB_SA_PATH_REC_SERVICE_ID;
1560
1561 if (addr->src_addr.sa_family == AF_INET) {
1562 path_rec.qos_class = cpu_to_be16((u16) id_priv->tos);
1563 comp_mask |= IB_SA_PATH_REC_QOS_CLASS;
1564 } else {
1565 sin6 = (struct sockaddr_in6 *) &addr->src_addr;
1566 path_rec.traffic_class = (u8) (be32_to_cpu(sin6->sin6_flowinfo) >> 20);
1567 comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
1568 }
1569
1570 id_priv->query_id = ib_sa_path_rec_get(&sa_client, id_priv->id.device,
1571 id_priv->id.port_num, &path_rec,
1572 comp_mask, timeout_ms,
1573 GFP_KERNEL, cma_query_handler,
1574 work, &id_priv->query);
1575
1576 return (id_priv->query_id < 0) ? id_priv->query_id : 0;
1577 }
1578
1579 static void cma_work_handler(struct work_struct *_work)
1580 {
1581 struct cma_work *work = container_of(_work, struct cma_work, work);
1582 struct rdma_id_private *id_priv = work->id;
1583 int destroy = 0;
1584
1585 mutex_lock(&id_priv->handler_mutex);
1586 if (!cma_comp_exch(id_priv, work->old_state, work->new_state))
1587 goto out;
1588
1589 if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
1590 cma_exch(id_priv, CMA_DESTROYING);
1591 destroy = 1;
1592 }
1593 out:
1594 mutex_unlock(&id_priv->handler_mutex);
1595 cma_deref_id(id_priv);
1596 if (destroy)
1597 rdma_destroy_id(&id_priv->id);
1598 kfree(work);
1599 }
1600
1601 static int cma_resolve_ib_route(struct rdma_id_private *id_priv, int timeout_ms)
1602 {
1603 struct rdma_route *route = &id_priv->id.route;
1604 struct cma_work *work;
1605 int ret;
1606
1607 work = kzalloc(sizeof *work, GFP_KERNEL);
1608 if (!work)
1609 return -ENOMEM;
1610
1611 work->id = id_priv;
1612 INIT_WORK(&work->work, cma_work_handler);
1613 work->old_state = CMA_ROUTE_QUERY;
1614 work->new_state = CMA_ROUTE_RESOLVED;
1615 work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
1616
1617 route->path_rec = kmalloc(sizeof *route->path_rec, GFP_KERNEL);
1618 if (!route->path_rec) {
1619 ret = -ENOMEM;
1620 goto err1;
1621 }
1622
1623 ret = cma_query_ib_route(id_priv, timeout_ms, work);
1624 if (ret)
1625 goto err2;
1626
1627 return 0;
1628 err2:
1629 kfree(route->path_rec);
1630 route->path_rec = NULL;
1631 err1:
1632 kfree(work);
1633 return ret;
1634 }
1635
1636 int rdma_set_ib_paths(struct rdma_cm_id *id,
1637 struct ib_sa_path_rec *path_rec, int num_paths)
1638 {
1639 struct rdma_id_private *id_priv;
1640 int ret;
1641
1642 id_priv = container_of(id, struct rdma_id_private, id);
1643 if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ROUTE_RESOLVED))
1644 return -EINVAL;
1645
1646 id->route.path_rec = kmalloc(sizeof *path_rec * num_paths, GFP_KERNEL);
1647 if (!id->route.path_rec) {
1648 ret = -ENOMEM;
1649 goto err;
1650 }
1651
1652 memcpy(id->route.path_rec, path_rec, sizeof *path_rec * num_paths);
1653 return 0;
1654 err:
1655 cma_comp_exch(id_priv, CMA_ROUTE_RESOLVED, CMA_ADDR_RESOLVED);
1656 return ret;
1657 }
1658 EXPORT_SYMBOL(rdma_set_ib_paths);
1659
1660 static int cma_resolve_iw_route(struct rdma_id_private *id_priv, int timeout_ms)
1661 {
1662 struct cma_work *work;
1663
1664 work = kzalloc(sizeof *work, GFP_KERNEL);
1665 if (!work)
1666 return -ENOMEM;
1667
1668 work->id = id_priv;
1669 INIT_WORK(&work->work, cma_work_handler);
1670 work->old_state = CMA_ROUTE_QUERY;
1671 work->new_state = CMA_ROUTE_RESOLVED;
1672 work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
1673 queue_work(cma_wq, &work->work);
1674 return 0;
1675 }
1676
1677 int rdma_resolve_route(struct rdma_cm_id *id, int timeout_ms)
1678 {
1679 struct rdma_id_private *id_priv;
1680 int ret;
1681
1682 id_priv = container_of(id, struct rdma_id_private, id);
1683 if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ROUTE_QUERY))
1684 return -EINVAL;
1685
1686 atomic_inc(&id_priv->refcount);
1687 switch (rdma_node_get_transport(id->device->node_type)) {
1688 case RDMA_TRANSPORT_IB:
1689 ret = cma_resolve_ib_route(id_priv, timeout_ms);
1690 break;
1691 case RDMA_TRANSPORT_IWARP:
1692 ret = cma_resolve_iw_route(id_priv, timeout_ms);
1693 break;
1694 default:
1695 ret = -ENOSYS;
1696 break;
1697 }
1698 if (ret)
1699 goto err;
1700
1701 return 0;
1702 err:
1703 cma_comp_exch(id_priv, CMA_ROUTE_QUERY, CMA_ADDR_RESOLVED);
1704 cma_deref_id(id_priv);
1705 return ret;
1706 }
1707 EXPORT_SYMBOL(rdma_resolve_route);
1708
1709 static int cma_bind_loopback(struct rdma_id_private *id_priv)
1710 {
1711 struct cma_device *cma_dev;
1712 struct ib_port_attr port_attr;
1713 union ib_gid gid;
1714 u16 pkey;
1715 int ret;
1716 u8 p;
1717
1718 mutex_lock(&lock);
1719 if (list_empty(&dev_list)) {
1720 ret = -ENODEV;
1721 goto out;
1722 }
1723 list_for_each_entry(cma_dev, &dev_list, list)
1724 for (p = 1; p <= cma_dev->device->phys_port_cnt; ++p)
1725 if (!ib_query_port(cma_dev->device, p, &port_attr) &&
1726 port_attr.state == IB_PORT_ACTIVE)
1727 goto port_found;
1728
1729 p = 1;
1730 cma_dev = list_entry(dev_list.next, struct cma_device, list);
1731
1732 port_found:
1733 ret = ib_get_cached_gid(cma_dev->device, p, 0, &gid);
1734 if (ret)
1735 goto out;
1736
1737 ret = ib_get_cached_pkey(cma_dev->device, p, 0, &pkey);
1738 if (ret)
1739 goto out;
1740
1741 ib_addr_set_sgid(&id_priv->id.route.addr.dev_addr, &gid);
1742 ib_addr_set_pkey(&id_priv->id.route.addr.dev_addr, pkey);
1743 id_priv->id.port_num = p;
1744 cma_attach_to_dev(id_priv, cma_dev);
1745 out:
1746 mutex_unlock(&lock);
1747 return ret;
1748 }
1749
1750 static void addr_handler(int status, struct sockaddr *src_addr,
1751 struct rdma_dev_addr *dev_addr, void *context)
1752 {
1753 struct rdma_id_private *id_priv = context;
1754 struct rdma_cm_event event;
1755
1756 memset(&event, 0, sizeof event);
1757 mutex_lock(&id_priv->handler_mutex);
1758
1759 /*
1760 * Grab mutex to block rdma_destroy_id() from removing the device while
1761 * we're trying to acquire it.
1762 */
1763 mutex_lock(&lock);
1764 if (!cma_comp_exch(id_priv, CMA_ADDR_QUERY, CMA_ADDR_RESOLVED)) {
1765 mutex_unlock(&lock);
1766 goto out;
1767 }
1768
1769 if (!status && !id_priv->cma_dev)
1770 status = cma_acquire_dev(id_priv);
1771 mutex_unlock(&lock);
1772
1773 if (status) {
1774 if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ADDR_BOUND))
1775 goto out;
1776 event.event = RDMA_CM_EVENT_ADDR_ERROR;
1777 event.status = status;
1778 } else {
1779 memcpy(&id_priv->id.route.addr.src_addr, src_addr,
1780 ip_addr_size(src_addr));
1781 event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
1782 }
1783
1784 if (id_priv->id.event_handler(&id_priv->id, &event)) {
1785 cma_exch(id_priv, CMA_DESTROYING);
1786 mutex_unlock(&id_priv->handler_mutex);
1787 cma_deref_id(id_priv);
1788 rdma_destroy_id(&id_priv->id);
1789 return;
1790 }
1791 out:
1792 mutex_unlock(&id_priv->handler_mutex);
1793 cma_deref_id(id_priv);
1794 }
1795
1796 static int cma_resolve_loopback(struct rdma_id_private *id_priv)
1797 {
1798 struct cma_work *work;
1799 struct sockaddr_in *src_in, *dst_in;
1800 union ib_gid gid;
1801 int ret;
1802
1803 work = kzalloc(sizeof *work, GFP_KERNEL);
1804 if (!work)
1805 return -ENOMEM;
1806
1807 if (!id_priv->cma_dev) {
1808 ret = cma_bind_loopback(id_priv);
1809 if (ret)
1810 goto err;
1811 }
1812
1813 ib_addr_get_sgid(&id_priv->id.route.addr.dev_addr, &gid);
1814 ib_addr_set_dgid(&id_priv->id.route.addr.dev_addr, &gid);
1815
1816 if (cma_zero_addr(&id_priv->id.route.addr.src_addr)) {
1817 src_in = (struct sockaddr_in *)&id_priv->id.route.addr.src_addr;
1818 dst_in = (struct sockaddr_in *)&id_priv->id.route.addr.dst_addr;
1819 src_in->sin_family = dst_in->sin_family;
1820 src_in->sin_addr.s_addr = dst_in->sin_addr.s_addr;
1821 }
1822
1823 work->id = id_priv;
1824 INIT_WORK(&work->work, cma_work_handler);
1825 work->old_state = CMA_ADDR_QUERY;
1826 work->new_state = CMA_ADDR_RESOLVED;
1827 work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
1828 queue_work(cma_wq, &work->work);
1829 return 0;
1830 err:
1831 kfree(work);
1832 return ret;
1833 }
1834
1835 static int cma_bind_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
1836 struct sockaddr *dst_addr)
1837 {
1838 if (src_addr && src_addr->sa_family)
1839 return rdma_bind_addr(id, src_addr);
1840 else
1841 return cma_bind_any(id, dst_addr->sa_family);
1842 }
1843
1844 int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
1845 struct sockaddr *dst_addr, int timeout_ms)
1846 {
1847 struct rdma_id_private *id_priv;
1848 int ret;
1849
1850 id_priv = container_of(id, struct rdma_id_private, id);
1851 if (id_priv->state == CMA_IDLE) {
1852 ret = cma_bind_addr(id, src_addr, dst_addr);
1853 if (ret)
1854 return ret;
1855 }
1856
1857 if (!cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_ADDR_QUERY))
1858 return -EINVAL;
1859
1860 atomic_inc(&id_priv->refcount);
1861 memcpy(&id->route.addr.dst_addr, dst_addr, ip_addr_size(dst_addr));
1862 if (cma_any_addr(dst_addr))
1863 ret = cma_resolve_loopback(id_priv);
1864 else
1865 ret = rdma_resolve_ip(&addr_client, &id->route.addr.src_addr,
1866 dst_addr, &id->route.addr.dev_addr,
1867 timeout_ms, addr_handler, id_priv);
1868 if (ret)
1869 goto err;
1870
1871 return 0;
1872 err:
1873 cma_comp_exch(id_priv, CMA_ADDR_QUERY, CMA_ADDR_BOUND);
1874 cma_deref_id(id_priv);
1875 return ret;
1876 }
1877 EXPORT_SYMBOL(rdma_resolve_addr);
1878
1879 static void cma_bind_port(struct rdma_bind_list *bind_list,
1880 struct rdma_id_private *id_priv)
1881 {
1882 struct sockaddr_in *sin;
1883
1884 sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
1885 sin->sin_port = htons(bind_list->port);
1886 id_priv->bind_list = bind_list;
1887 hlist_add_head(&id_priv->node, &bind_list->owners);
1888 }
1889
1890 static int cma_alloc_port(struct idr *ps, struct rdma_id_private *id_priv,
1891 unsigned short snum)
1892 {
1893 struct rdma_bind_list *bind_list;
1894 int port, ret;
1895
1896 bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL);
1897 if (!bind_list)
1898 return -ENOMEM;
1899
1900 do {
1901 ret = idr_get_new_above(ps, bind_list, snum, &port);
1902 } while ((ret == -EAGAIN) && idr_pre_get(ps, GFP_KERNEL));
1903
1904 if (ret)
1905 goto err1;
1906
1907 if (port != snum) {
1908 ret = -EADDRNOTAVAIL;
1909 goto err2;
1910 }
1911
1912 bind_list->ps = ps;
1913 bind_list->port = (unsigned short) port;
1914 cma_bind_port(bind_list, id_priv);
1915 return 0;
1916 err2:
1917 idr_remove(ps, port);
1918 err1:
1919 kfree(bind_list);
1920 return ret;
1921 }
1922
1923 static int cma_alloc_any_port(struct idr *ps, struct rdma_id_private *id_priv)
1924 {
1925 struct rdma_bind_list *bind_list;
1926 int port, ret, low, high;
1927
1928 bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL);
1929 if (!bind_list)
1930 return -ENOMEM;
1931
1932 retry:
1933 /* FIXME: add proper port randomization per like inet_csk_get_port */
1934 do {
1935 ret = idr_get_new_above(ps, bind_list, next_port, &port);
1936 } while ((ret == -EAGAIN) && idr_pre_get(ps, GFP_KERNEL));
1937
1938 if (ret)
1939 goto err1;
1940
1941 inet_get_local_port_range(&low, &high);
1942 if (port > high) {
1943 if (next_port != low) {
1944 idr_remove(ps, port);
1945 next_port = low;
1946 goto retry;
1947 }
1948 ret = -EADDRNOTAVAIL;
1949 goto err2;
1950 }
1951
1952 if (port == high)
1953 next_port = low;
1954 else
1955 next_port = port + 1;
1956
1957 bind_list->ps = ps;
1958 bind_list->port = (unsigned short) port;
1959 cma_bind_port(bind_list, id_priv);
1960 return 0;
1961 err2:
1962 idr_remove(ps, port);
1963 err1:
1964 kfree(bind_list);
1965 return ret;
1966 }
1967
1968 static int cma_use_port(struct idr *ps, struct rdma_id_private *id_priv)
1969 {
1970 struct rdma_id_private *cur_id;
1971 struct sockaddr_in *sin, *cur_sin;
1972 struct rdma_bind_list *bind_list;
1973 struct hlist_node *node;
1974 unsigned short snum;
1975
1976 sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
1977 snum = ntohs(sin->sin_port);
1978 if (snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
1979 return -EACCES;
1980
1981 bind_list = idr_find(ps, snum);
1982 if (!bind_list)
1983 return cma_alloc_port(ps, id_priv, snum);
1984
1985 /*
1986 * We don't support binding to any address if anyone is bound to
1987 * a specific address on the same port.
1988 */
1989 if (cma_any_addr(&id_priv->id.route.addr.src_addr))
1990 return -EADDRNOTAVAIL;
1991
1992 hlist_for_each_entry(cur_id, node, &bind_list->owners, node) {
1993 if (cma_any_addr(&cur_id->id.route.addr.src_addr))
1994 return -EADDRNOTAVAIL;
1995
1996 cur_sin = (struct sockaddr_in *) &cur_id->id.route.addr.src_addr;
1997 if (sin->sin_addr.s_addr == cur_sin->sin_addr.s_addr)
1998 return -EADDRINUSE;
1999 }
2000
2001 cma_bind_port(bind_list, id_priv);
2002 return 0;
2003 }
2004
2005 static int cma_get_port(struct rdma_id_private *id_priv)
2006 {
2007 struct idr *ps;
2008 int ret;
2009
2010 switch (id_priv->id.ps) {
2011 case RDMA_PS_SDP:
2012 ps = &sdp_ps;
2013 break;
2014 case RDMA_PS_TCP:
2015 ps = &tcp_ps;
2016 break;
2017 case RDMA_PS_UDP:
2018 ps = &udp_ps;
2019 break;
2020 case RDMA_PS_IPOIB:
2021 ps = &ipoib_ps;
2022 break;
2023 default:
2024 return -EPROTONOSUPPORT;
2025 }
2026
2027 mutex_lock(&lock);
2028 if (cma_any_port(&id_priv->id.route.addr.src_addr))
2029 ret = cma_alloc_any_port(ps, id_priv);
2030 else
2031 ret = cma_use_port(ps, id_priv);
2032 mutex_unlock(&lock);
2033
2034 return ret;
2035 }
2036
2037 int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr)
2038 {
2039 struct rdma_id_private *id_priv;
2040 int ret;
2041
2042 if (addr->sa_family != AF_INET)
2043 return -EAFNOSUPPORT;
2044
2045 id_priv = container_of(id, struct rdma_id_private, id);
2046 if (!cma_comp_exch(id_priv, CMA_IDLE, CMA_ADDR_BOUND))
2047 return -EINVAL;
2048
2049 if (!cma_any_addr(addr)) {
2050 ret = rdma_translate_ip(addr, &id->route.addr.dev_addr);
2051 if (ret)
2052 goto err1;
2053
2054 mutex_lock(&lock);
2055 ret = cma_acquire_dev(id_priv);
2056 mutex_unlock(&lock);
2057 if (ret)
2058 goto err1;
2059 }
2060
2061 memcpy(&id->route.addr.src_addr, addr, ip_addr_size(addr));
2062 ret = cma_get_port(id_priv);
2063 if (ret)
2064 goto err2;
2065
2066 return 0;
2067 err2:
2068 if (!cma_any_addr(addr)) {
2069 mutex_lock(&lock);
2070 cma_detach_from_dev(id_priv);
2071 mutex_unlock(&lock);
2072 }
2073 err1:
2074 cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_IDLE);
2075 return ret;
2076 }
2077 EXPORT_SYMBOL(rdma_bind_addr);
2078
2079 static int cma_format_hdr(void *hdr, enum rdma_port_space ps,
2080 struct rdma_route *route)
2081 {
2082 struct sockaddr_in *src4, *dst4;
2083 struct cma_hdr *cma_hdr;
2084 struct sdp_hh *sdp_hdr;
2085
2086 src4 = (struct sockaddr_in *) &route->addr.src_addr;
2087 dst4 = (struct sockaddr_in *) &route->addr.dst_addr;
2088
2089 switch (ps) {
2090 case RDMA_PS_SDP:
2091 sdp_hdr = hdr;
2092 if (sdp_get_majv(sdp_hdr->sdp_version) != SDP_MAJ_VERSION)
2093 return -EINVAL;
2094 sdp_set_ip_ver(sdp_hdr, 4);
2095 sdp_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
2096 sdp_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
2097 sdp_hdr->port = src4->sin_port;
2098 break;
2099 default:
2100 cma_hdr = hdr;
2101 cma_hdr->cma_version = CMA_VERSION;
2102 cma_set_ip_ver(cma_hdr, 4);
2103 cma_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
2104 cma_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
2105 cma_hdr->port = src4->sin_port;
2106 break;
2107 }
2108 return 0;
2109 }
2110
2111 static int cma_sidr_rep_handler(struct ib_cm_id *cm_id,
2112 struct ib_cm_event *ib_event)
2113 {
2114 struct rdma_id_private *id_priv = cm_id->context;
2115 struct rdma_cm_event event;
2116 struct ib_cm_sidr_rep_event_param *rep = &ib_event->param.sidr_rep_rcvd;
2117 int ret = 0;
2118
2119 if (cma_disable_callback(id_priv, CMA_CONNECT))
2120 return 0;
2121
2122 memset(&event, 0, sizeof event);
2123 switch (ib_event->event) {
2124 case IB_CM_SIDR_REQ_ERROR:
2125 event.event = RDMA_CM_EVENT_UNREACHABLE;
2126 event.status = -ETIMEDOUT;
2127 break;
2128 case IB_CM_SIDR_REP_RECEIVED:
2129 event.param.ud.private_data = ib_event->private_data;
2130 event.param.ud.private_data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
2131 if (rep->status != IB_SIDR_SUCCESS) {
2132 event.event = RDMA_CM_EVENT_UNREACHABLE;
2133 event.status = ib_event->param.sidr_rep_rcvd.status;
2134 break;
2135 }
2136 if (id_priv->qkey != rep->qkey) {
2137 event.event = RDMA_CM_EVENT_UNREACHABLE;
2138 event.status = -EINVAL;
2139 break;
2140 }
2141 ib_init_ah_from_path(id_priv->id.device, id_priv->id.port_num,
2142 id_priv->id.route.path_rec,
2143 &event.param.ud.ah_attr);
2144 event.param.ud.qp_num = rep->qpn;
2145 event.param.ud.qkey = rep->qkey;
2146 event.event = RDMA_CM_EVENT_ESTABLISHED;
2147 event.status = 0;
2148 break;
2149 default:
2150 printk(KERN_ERR "RDMA CMA: unexpected IB CM event: %d\n",
2151 ib_event->event);
2152 goto out;
2153 }
2154
2155 ret = id_priv->id.event_handler(&id_priv->id, &event);
2156 if (ret) {
2157 /* Destroy the CM ID by returning a non-zero value. */
2158 id_priv->cm_id.ib = NULL;
2159 cma_exch(id_priv, CMA_DESTROYING);
2160 mutex_unlock(&id_priv->handler_mutex);
2161 rdma_destroy_id(&id_priv->id);
2162 return ret;
2163 }
2164 out:
2165 mutex_unlock(&id_priv->handler_mutex);
2166 return ret;
2167 }
2168
2169 static int cma_resolve_ib_udp(struct rdma_id_private *id_priv,
2170 struct rdma_conn_param *conn_param)
2171 {
2172 struct ib_cm_sidr_req_param req;
2173 struct rdma_route *route;
2174 int ret;
2175
2176 req.private_data_len = sizeof(struct cma_hdr) +
2177 conn_param->private_data_len;
2178 req.private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
2179 if (!req.private_data)
2180 return -ENOMEM;
2181
2182 if (conn_param->private_data && conn_param->private_data_len)
2183 memcpy((void *) req.private_data + sizeof(struct cma_hdr),
2184 conn_param->private_data, conn_param->private_data_len);
2185
2186 route = &id_priv->id.route;
2187 ret = cma_format_hdr((void *) req.private_data, id_priv->id.ps, route);
2188 if (ret)
2189 goto out;
2190
2191 id_priv->cm_id.ib = ib_create_cm_id(id_priv->id.device,
2192 cma_sidr_rep_handler, id_priv);
2193 if (IS_ERR(id_priv->cm_id.ib)) {
2194 ret = PTR_ERR(id_priv->cm_id.ib);
2195 goto out;
2196 }
2197
2198 req.path = route->path_rec;
2199 req.service_id = cma_get_service_id(id_priv->id.ps,
2200 &route->addr.dst_addr);
2201 req.timeout_ms = 1 << (CMA_CM_RESPONSE_TIMEOUT - 8);
2202 req.max_cm_retries = CMA_MAX_CM_RETRIES;
2203
2204 ret = ib_send_cm_sidr_req(id_priv->cm_id.ib, &req);
2205 if (ret) {
2206 ib_destroy_cm_id(id_priv->cm_id.ib);
2207 id_priv->cm_id.ib = NULL;
2208 }
2209 out:
2210 kfree(req.private_data);
2211 return ret;
2212 }
2213
2214 static int cma_connect_ib(struct rdma_id_private *id_priv,
2215 struct rdma_conn_param *conn_param)
2216 {
2217 struct ib_cm_req_param req;
2218 struct rdma_route *route;
2219 void *private_data;
2220 int offset, ret;
2221
2222 memset(&req, 0, sizeof req);
2223 offset = cma_user_data_offset(id_priv->id.ps);
2224 req.private_data_len = offset + conn_param->private_data_len;
2225 private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
2226 if (!private_data)
2227 return -ENOMEM;
2228
2229 if (conn_param->private_data && conn_param->private_data_len)
2230 memcpy(private_data + offset, conn_param->private_data,
2231 conn_param->private_data_len);
2232
2233 id_priv->cm_id.ib = ib_create_cm_id(id_priv->id.device, cma_ib_handler,
2234 id_priv);
2235 if (IS_ERR(id_priv->cm_id.ib)) {
2236 ret = PTR_ERR(id_priv->cm_id.ib);
2237 goto out;
2238 }
2239
2240 route = &id_priv->id.route;
2241 ret = cma_format_hdr(private_data, id_priv->id.ps, route);
2242 if (ret)
2243 goto out;
2244 req.private_data = private_data;
2245
2246 req.primary_path = &route->path_rec[0];
2247 if (route->num_paths == 2)
2248 req.alternate_path = &route->path_rec[1];
2249
2250 req.service_id = cma_get_service_id(id_priv->id.ps,
2251 &route->addr.dst_addr);
2252 req.qp_num = id_priv->qp_num;
2253 req.qp_type = IB_QPT_RC;
2254 req.starting_psn = id_priv->seq_num;
2255 req.responder_resources = conn_param->responder_resources;
2256 req.initiator_depth = conn_param->initiator_depth;
2257 req.flow_control = conn_param->flow_control;
2258 req.retry_count = conn_param->retry_count;
2259 req.rnr_retry_count = conn_param->rnr_retry_count;
2260 req.remote_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
2261 req.local_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
2262 req.max_cm_retries = CMA_MAX_CM_RETRIES;
2263 req.srq = id_priv->srq ? 1 : 0;
2264
2265 ret = ib_send_cm_req(id_priv->cm_id.ib, &req);
2266 out:
2267 if (ret && !IS_ERR(id_priv->cm_id.ib)) {
2268 ib_destroy_cm_id(id_priv->cm_id.ib);
2269 id_priv->cm_id.ib = NULL;
2270 }
2271
2272 kfree(private_data);
2273 return ret;
2274 }
2275
2276 static int cma_connect_iw(struct rdma_id_private *id_priv,
2277 struct rdma_conn_param *conn_param)
2278 {
2279 struct iw_cm_id *cm_id;
2280 struct sockaddr_in* sin;
2281 int ret;
2282 struct iw_cm_conn_param iw_param;
2283
2284 cm_id = iw_create_cm_id(id_priv->id.device, cma_iw_handler, id_priv);
2285 if (IS_ERR(cm_id)) {
2286 ret = PTR_ERR(cm_id);
2287 goto out;
2288 }
2289
2290 id_priv->cm_id.iw = cm_id;
2291
2292 sin = (struct sockaddr_in*) &id_priv->id.route.addr.src_addr;
2293 cm_id->local_addr = *sin;
2294
2295 sin = (struct sockaddr_in*) &id_priv->id.route.addr.dst_addr;
2296 cm_id->remote_addr = *sin;
2297
2298 ret = cma_modify_qp_rtr(id_priv, conn_param);
2299 if (ret)
2300 goto out;
2301
2302 iw_param.ord = conn_param->initiator_depth;
2303 iw_param.ird = conn_param->responder_resources;
2304 iw_param.private_data = conn_param->private_data;
2305 iw_param.private_data_len = conn_param->private_data_len;
2306 if (id_priv->id.qp)
2307 iw_param.qpn = id_priv->qp_num;
2308 else
2309 iw_param.qpn = conn_param->qp_num;
2310 ret = iw_cm_connect(cm_id, &iw_param);
2311 out:
2312 if (ret && !IS_ERR(cm_id)) {
2313 iw_destroy_cm_id(cm_id);
2314 id_priv->cm_id.iw = NULL;
2315 }
2316 return ret;
2317 }
2318
2319 int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
2320 {
2321 struct rdma_id_private *id_priv;
2322 int ret;
2323
2324 id_priv = container_of(id, struct rdma_id_private, id);
2325 if (!cma_comp_exch(id_priv, CMA_ROUTE_RESOLVED, CMA_CONNECT))
2326 return -EINVAL;
2327
2328 if (!id->qp) {
2329 id_priv->qp_num = conn_param->qp_num;
2330 id_priv->srq = conn_param->srq;
2331 }
2332
2333 switch (rdma_node_get_transport(id->device->node_type)) {
2334 case RDMA_TRANSPORT_IB:
2335 if (cma_is_ud_ps(id->ps))
2336 ret = cma_resolve_ib_udp(id_priv, conn_param);
2337 else
2338 ret = cma_connect_ib(id_priv, conn_param);
2339 break;
2340 case RDMA_TRANSPORT_IWARP:
2341 ret = cma_connect_iw(id_priv, conn_param);
2342 break;
2343 default:
2344 ret = -ENOSYS;
2345 break;
2346 }
2347 if (ret)
2348 goto err;
2349
2350 return 0;
2351 err:
2352 cma_comp_exch(id_priv, CMA_CONNECT, CMA_ROUTE_RESOLVED);
2353 return ret;
2354 }
2355 EXPORT_SYMBOL(rdma_connect);
2356
2357 static int cma_accept_ib(struct rdma_id_private *id_priv,
2358 struct rdma_conn_param *conn_param)
2359 {
2360 struct ib_cm_rep_param rep;
2361 int ret;
2362
2363 ret = cma_modify_qp_rtr(id_priv, conn_param);
2364 if (ret)
2365 goto out;
2366
2367 ret = cma_modify_qp_rts(id_priv, conn_param);
2368 if (ret)
2369 goto out;
2370
2371 memset(&rep, 0, sizeof rep);
2372 rep.qp_num = id_priv->qp_num;
2373 rep.starting_psn = id_priv->seq_num;
2374 rep.private_data = conn_param->private_data;
2375 rep.private_data_len = conn_param->private_data_len;
2376 rep.responder_resources = conn_param->responder_resources;
2377 rep.initiator_depth = conn_param->initiator_depth;
2378 rep.failover_accepted = 0;
2379 rep.flow_control = conn_param->flow_control;
2380 rep.rnr_retry_count = conn_param->rnr_retry_count;
2381 rep.srq = id_priv->srq ? 1 : 0;
2382
2383 ret = ib_send_cm_rep(id_priv->cm_id.ib, &rep);
2384 out:
2385 return ret;
2386 }
2387
2388 static int cma_accept_iw(struct rdma_id_private *id_priv,
2389 struct rdma_conn_param *conn_param)
2390 {
2391 struct iw_cm_conn_param iw_param;
2392 int ret;
2393
2394 ret = cma_modify_qp_rtr(id_priv, conn_param);
2395 if (ret)
2396 return ret;
2397
2398 iw_param.ord = conn_param->initiator_depth;
2399 iw_param.ird = conn_param->responder_resources;
2400 iw_param.private_data = conn_param->private_data;
2401 iw_param.private_data_len = conn_param->private_data_len;
2402 if (id_priv->id.qp) {
2403 iw_param.qpn = id_priv->qp_num;
2404 } else
2405 iw_param.qpn = conn_param->qp_num;
2406
2407 return iw_cm_accept(id_priv->cm_id.iw, &iw_param);
2408 }
2409
2410 static int cma_send_sidr_rep(struct rdma_id_private *id_priv,
2411 enum ib_cm_sidr_status status,
2412 const void *private_data, int private_data_len)
2413 {
2414 struct ib_cm_sidr_rep_param rep;
2415
2416 memset(&rep, 0, sizeof rep);
2417 rep.status = status;
2418 if (status == IB_SIDR_SUCCESS) {
2419 rep.qp_num = id_priv->qp_num;
2420 rep.qkey = id_priv->qkey;
2421 }
2422 rep.private_data = private_data;
2423 rep.private_data_len = private_data_len;
2424
2425 return ib_send_cm_sidr_rep(id_priv->cm_id.ib, &rep);
2426 }
2427
2428 int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
2429 {
2430 struct rdma_id_private *id_priv;
2431 int ret;
2432
2433 id_priv = container_of(id, struct rdma_id_private, id);
2434 if (!cma_comp(id_priv, CMA_CONNECT))
2435 return -EINVAL;
2436
2437 if (!id->qp && conn_param) {
2438 id_priv->qp_num = conn_param->qp_num;
2439 id_priv->srq = conn_param->srq;
2440 }
2441
2442 switch (rdma_node_get_transport(id->device->node_type)) {
2443 case RDMA_TRANSPORT_IB:
2444 if (cma_is_ud_ps(id->ps))
2445 ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
2446 conn_param->private_data,
2447 conn_param->private_data_len);
2448 else if (conn_param)
2449 ret = cma_accept_ib(id_priv, conn_param);
2450 else
2451 ret = cma_rep_recv(id_priv);
2452 break;
2453 case RDMA_TRANSPORT_IWARP:
2454 ret = cma_accept_iw(id_priv, conn_param);
2455 break;
2456 default:
2457 ret = -ENOSYS;
2458 break;
2459 }
2460
2461 if (ret)
2462 goto reject;
2463
2464 return 0;
2465 reject:
2466 cma_modify_qp_err(id_priv);
2467 rdma_reject(id, NULL, 0);
2468 return ret;
2469 }
2470 EXPORT_SYMBOL(rdma_accept);
2471
2472 int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event)
2473 {
2474 struct rdma_id_private *id_priv;
2475 int ret;
2476
2477 id_priv = container_of(id, struct rdma_id_private, id);
2478 if (!cma_has_cm_dev(id_priv))
2479 return -EINVAL;
2480
2481 switch (id->device->node_type) {
2482 case RDMA_NODE_IB_CA:
2483 ret = ib_cm_notify(id_priv->cm_id.ib, event);
2484 break;
2485 default:
2486 ret = 0;
2487 break;
2488 }
2489 return ret;
2490 }
2491 EXPORT_SYMBOL(rdma_notify);
2492
2493 int rdma_reject(struct rdma_cm_id *id, const void *private_data,
2494 u8 private_data_len)
2495 {
2496 struct rdma_id_private *id_priv;
2497 int ret;
2498
2499 id_priv = container_of(id, struct rdma_id_private, id);
2500 if (!cma_has_cm_dev(id_priv))
2501 return -EINVAL;
2502
2503 switch (rdma_node_get_transport(id->device->node_type)) {
2504 case RDMA_TRANSPORT_IB:
2505 if (cma_is_ud_ps(id->ps))
2506 ret = cma_send_sidr_rep(id_priv, IB_SIDR_REJECT,
2507 private_data, private_data_len);
2508 else
2509 ret = ib_send_cm_rej(id_priv->cm_id.ib,
2510 IB_CM_REJ_CONSUMER_DEFINED, NULL,
2511 0, private_data, private_data_len);
2512 break;
2513 case RDMA_TRANSPORT_IWARP:
2514 ret = iw_cm_reject(id_priv->cm_id.iw,
2515 private_data, private_data_len);
2516 break;
2517 default:
2518 ret = -ENOSYS;
2519 break;
2520 }
2521 return ret;
2522 }
2523 EXPORT_SYMBOL(rdma_reject);
2524
2525 int rdma_disconnect(struct rdma_cm_id *id)
2526 {
2527 struct rdma_id_private *id_priv;
2528 int ret;
2529
2530 id_priv = container_of(id, struct rdma_id_private, id);
2531 if (!cma_has_cm_dev(id_priv))
2532 return -EINVAL;
2533
2534 switch (rdma_node_get_transport(id->device->node_type)) {
2535 case RDMA_TRANSPORT_IB:
2536 ret = cma_modify_qp_err(id_priv);
2537 if (ret)
2538 goto out;
2539 /* Initiate or respond to a disconnect. */
2540 if (ib_send_cm_dreq(id_priv->cm_id.ib, NULL, 0))
2541 ib_send_cm_drep(id_priv->cm_id.ib, NULL, 0);
2542 break;
2543 case RDMA_TRANSPORT_IWARP:
2544 ret = iw_cm_disconnect(id_priv->cm_id.iw, 0);
2545 break;
2546 default:
2547 ret = -EINVAL;
2548 break;
2549 }
2550 out:
2551 return ret;
2552 }
2553 EXPORT_SYMBOL(rdma_disconnect);
2554
2555 static int cma_ib_mc_handler(int status, struct ib_sa_multicast *multicast)
2556 {
2557 struct rdma_id_private *id_priv;
2558 struct cma_multicast *mc = multicast->context;
2559 struct rdma_cm_event event;
2560 int ret;
2561
2562 id_priv = mc->id_priv;
2563 if (cma_disable_callback(id_priv, CMA_ADDR_BOUND) &&
2564 cma_disable_callback(id_priv, CMA_ADDR_RESOLVED))
2565 return 0;
2566
2567 mutex_lock(&id_priv->qp_mutex);
2568 if (!status && id_priv->id.qp)
2569 status = ib_attach_mcast(id_priv->id.qp, &multicast->rec.mgid,
2570 multicast->rec.mlid);
2571 mutex_unlock(&id_priv->qp_mutex);
2572
2573 memset(&event, 0, sizeof event);
2574 event.status = status;
2575 event.param.ud.private_data = mc->context;
2576 if (!status) {
2577 event.event = RDMA_CM_EVENT_MULTICAST_JOIN;
2578 ib_init_ah_from_mcmember(id_priv->id.device,
2579 id_priv->id.port_num, &multicast->rec,
2580 &event.param.ud.ah_attr);
2581 event.param.ud.qp_num = 0xFFFFFF;
2582 event.param.ud.qkey = be32_to_cpu(multicast->rec.qkey);
2583 } else
2584 event.event = RDMA_CM_EVENT_MULTICAST_ERROR;
2585
2586 ret = id_priv->id.event_handler(&id_priv->id, &event);
2587 if (ret) {
2588 cma_exch(id_priv, CMA_DESTROYING);
2589 mutex_unlock(&id_priv->handler_mutex);
2590 rdma_destroy_id(&id_priv->id);
2591 return 0;
2592 }
2593
2594 mutex_unlock(&id_priv->handler_mutex);
2595 return 0;
2596 }
2597
2598 static void cma_set_mgid(struct rdma_id_private *id_priv,
2599 struct sockaddr *addr, union ib_gid *mgid)
2600 {
2601 unsigned char mc_map[MAX_ADDR_LEN];
2602 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
2603 struct sockaddr_in *sin = (struct sockaddr_in *) addr;
2604 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) addr;
2605
2606 if (cma_any_addr(addr)) {
2607 memset(mgid, 0, sizeof *mgid);
2608 } else if ((addr->sa_family == AF_INET6) &&
2609 ((be32_to_cpu(sin6->sin6_addr.s6_addr32[0]) & 0xFF10A01B) ==
2610 0xFF10A01B)) {
2611 /* IPv6 address is an SA assigned MGID. */
2612 memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
2613 } else {
2614 ip_ib_mc_map(sin->sin_addr.s_addr, dev_addr->broadcast, mc_map);
2615 if (id_priv->id.ps == RDMA_PS_UDP)
2616 mc_map[7] = 0x01; /* Use RDMA CM signature */
2617 *mgid = *(union ib_gid *) (mc_map + 4);
2618 }
2619 }
2620
2621 static int cma_join_ib_multicast(struct rdma_id_private *id_priv,
2622 struct cma_multicast *mc)
2623 {
2624 struct ib_sa_mcmember_rec rec;
2625 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
2626 ib_sa_comp_mask comp_mask;
2627 int ret;
2628
2629 ib_addr_get_mgid(dev_addr, &rec.mgid);
2630 ret = ib_sa_get_mcmember_rec(id_priv->id.device, id_priv->id.port_num,
2631 &rec.mgid, &rec);
2632 if (ret)
2633 return ret;
2634
2635 cma_set_mgid(id_priv, &mc->addr, &rec.mgid);
2636 if (id_priv->id.ps == RDMA_PS_UDP)
2637 rec.qkey = cpu_to_be32(RDMA_UDP_QKEY);
2638 ib_addr_get_sgid(dev_addr, &rec.port_gid);
2639 rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
2640 rec.join_state = 1;
2641
2642 comp_mask = IB_SA_MCMEMBER_REC_MGID | IB_SA_MCMEMBER_REC_PORT_GID |
2643 IB_SA_MCMEMBER_REC_PKEY | IB_SA_MCMEMBER_REC_JOIN_STATE |
2644 IB_SA_MCMEMBER_REC_QKEY | IB_SA_MCMEMBER_REC_SL |
2645 IB_SA_MCMEMBER_REC_FLOW_LABEL |
2646 IB_SA_MCMEMBER_REC_TRAFFIC_CLASS;
2647
2648 mc->multicast.ib = ib_sa_join_multicast(&sa_client, id_priv->id.device,
2649 id_priv->id.port_num, &rec,
2650 comp_mask, GFP_KERNEL,
2651 cma_ib_mc_handler, mc);
2652 if (IS_ERR(mc->multicast.ib))
2653 return PTR_ERR(mc->multicast.ib);
2654
2655 return 0;
2656 }
2657
2658 int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
2659 void *context)
2660 {
2661 struct rdma_id_private *id_priv;
2662 struct cma_multicast *mc;
2663 int ret;
2664
2665 id_priv = container_of(id, struct rdma_id_private, id);
2666 if (!cma_comp(id_priv, CMA_ADDR_BOUND) &&
2667 !cma_comp(id_priv, CMA_ADDR_RESOLVED))
2668 return -EINVAL;
2669
2670 mc = kmalloc(sizeof *mc, GFP_KERNEL);
2671 if (!mc)
2672 return -ENOMEM;
2673
2674 memcpy(&mc->addr, addr, ip_addr_size(addr));
2675 mc->context = context;
2676 mc->id_priv = id_priv;
2677
2678 spin_lock(&id_priv->lock);
2679 list_add(&mc->list, &id_priv->mc_list);
2680 spin_unlock(&id_priv->lock);
2681
2682 switch (rdma_node_get_transport(id->device->node_type)) {
2683 case RDMA_TRANSPORT_IB:
2684 ret = cma_join_ib_multicast(id_priv, mc);
2685 break;
2686 default:
2687 ret = -ENOSYS;
2688 break;
2689 }
2690
2691 if (ret) {
2692 spin_lock_irq(&id_priv->lock);
2693 list_del(&mc->list);
2694 spin_unlock_irq(&id_priv->lock);
2695 kfree(mc);
2696 }
2697 return ret;
2698 }
2699 EXPORT_SYMBOL(rdma_join_multicast);
2700
2701 void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr)
2702 {
2703 struct rdma_id_private *id_priv;
2704 struct cma_multicast *mc;
2705
2706 id_priv = container_of(id, struct rdma_id_private, id);
2707 spin_lock_irq(&id_priv->lock);
2708 list_for_each_entry(mc, &id_priv->mc_list, list) {
2709 if (!memcmp(&mc->addr, addr, ip_addr_size(addr))) {
2710 list_del(&mc->list);
2711 spin_unlock_irq(&id_priv->lock);
2712
2713 if (id->qp)
2714 ib_detach_mcast(id->qp,
2715 &mc->multicast.ib->rec.mgid,
2716 mc->multicast.ib->rec.mlid);
2717 ib_sa_free_multicast(mc->multicast.ib);
2718 kfree(mc);
2719 return;
2720 }
2721 }
2722 spin_unlock_irq(&id_priv->lock);
2723 }
2724 EXPORT_SYMBOL(rdma_leave_multicast);
2725
2726 static void cma_add_one(struct ib_device *device)
2727 {
2728 struct cma_device *cma_dev;
2729 struct rdma_id_private *id_priv;
2730
2731 cma_dev = kmalloc(sizeof *cma_dev, GFP_KERNEL);
2732 if (!cma_dev)
2733 return;
2734
2735 cma_dev->device = device;
2736
2737 init_completion(&cma_dev->comp);
2738 atomic_set(&cma_dev->refcount, 1);
2739 INIT_LIST_HEAD(&cma_dev->id_list);
2740 ib_set_client_data(device, &cma_client, cma_dev);
2741
2742 mutex_lock(&lock);
2743 list_add_tail(&cma_dev->list, &dev_list);
2744 list_for_each_entry(id_priv, &listen_any_list, list)
2745 cma_listen_on_dev(id_priv, cma_dev);
2746 mutex_unlock(&lock);
2747 }
2748
2749 static int cma_remove_id_dev(struct rdma_id_private *id_priv)
2750 {
2751 struct rdma_cm_event event;
2752 enum cma_state state;
2753 int ret = 0;
2754
2755 /* Record that we want to remove the device */
2756 state = cma_exch(id_priv, CMA_DEVICE_REMOVAL);
2757 if (state == CMA_DESTROYING)
2758 return 0;
2759
2760 cma_cancel_operation(id_priv, state);
2761 mutex_lock(&id_priv->handler_mutex);
2762
2763 /* Check for destruction from another callback. */
2764 if (!cma_comp(id_priv, CMA_DEVICE_REMOVAL))
2765 goto out;
2766
2767 memset(&event, 0, sizeof event);
2768 event.event = RDMA_CM_EVENT_DEVICE_REMOVAL;
2769 ret = id_priv->id.event_handler(&id_priv->id, &event);
2770 out:
2771 mutex_unlock(&id_priv->handler_mutex);
2772 return ret;
2773 }
2774
2775 static void cma_process_remove(struct cma_device *cma_dev)
2776 {
2777 struct rdma_id_private *id_priv;
2778 int ret;
2779
2780 mutex_lock(&lock);
2781 while (!list_empty(&cma_dev->id_list)) {
2782 id_priv = list_entry(cma_dev->id_list.next,
2783 struct rdma_id_private, list);
2784
2785 list_del(&id_priv->listen_list);
2786 list_del_init(&id_priv->list);
2787 atomic_inc(&id_priv->refcount);
2788 mutex_unlock(&lock);
2789
2790 ret = id_priv->internal_id ? 1 : cma_remove_id_dev(id_priv);
2791 cma_deref_id(id_priv);
2792 if (ret)
2793 rdma_destroy_id(&id_priv->id);
2794
2795 mutex_lock(&lock);
2796 }
2797 mutex_unlock(&lock);
2798
2799 cma_deref_dev(cma_dev);
2800 wait_for_completion(&cma_dev->comp);
2801 }
2802
2803 static void cma_remove_one(struct ib_device *device)
2804 {
2805 struct cma_device *cma_dev;
2806
2807 cma_dev = ib_get_client_data(device, &cma_client);
2808 if (!cma_dev)
2809 return;
2810
2811 mutex_lock(&lock);
2812 list_del(&cma_dev->list);
2813 mutex_unlock(&lock);
2814
2815 cma_process_remove(cma_dev);
2816 kfree(cma_dev);
2817 }
2818
2819 static int cma_init(void)
2820 {
2821 int ret, low, high, remaining;
2822
2823 get_random_bytes(&next_port, sizeof next_port);
2824 inet_get_local_port_range(&low, &high);
2825 remaining = (high - low) + 1;
2826 next_port = ((unsigned int) next_port % remaining) + low;
2827
2828 cma_wq = create_singlethread_workqueue("rdma_cm");
2829 if (!cma_wq)
2830 return -ENOMEM;
2831
2832 ib_sa_register_client(&sa_client);
2833 rdma_addr_register_client(&addr_client);
2834
2835 ret = ib_register_client(&cma_client);
2836 if (ret)
2837 goto err;
2838 return 0;
2839
2840 err:
2841 rdma_addr_unregister_client(&addr_client);
2842 ib_sa_unregister_client(&sa_client);
2843 destroy_workqueue(cma_wq);
2844 return ret;
2845 }
2846
2847 static void cma_cleanup(void)
2848 {
2849 ib_unregister_client(&cma_client);
2850 rdma_addr_unregister_client(&addr_client);
2851 ib_sa_unregister_client(&sa_client);
2852 destroy_workqueue(cma_wq);
2853 idr_destroy(&sdp_ps);
2854 idr_destroy(&tcp_ps);
2855 idr_destroy(&udp_ps);
2856 idr_destroy(&ipoib_ps);
2857 }
2858
2859 module_init(cma_init);
2860 module_exit(cma_cleanup);
kernel source for telekom puls (alcatel/mediatek)