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pcmcia: deprecate unused CS_ error codes
[linux-2.6/mini2440.git] / drivers / infiniband / core / cma.c
blobe980ff3335db6470fe0c0f2c2b0c17f9fbe1d401
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 struct cma_ndev_work {
172 struct work_struct work;
173 struct rdma_id_private *id;
174 struct rdma_cm_event event;
175 };
176
177 union cma_ip_addr {
178 struct in6_addr ip6;
179 struct {
180 __be32 pad[3];
181 __be32 addr;
182 } ip4;
183 };
184
185 struct cma_hdr {
186 u8 cma_version;
187 u8 ip_version; /* IP version: 7:4 */
188 __be16 port;
189 union cma_ip_addr src_addr;
190 union cma_ip_addr dst_addr;
191 };
192
193 struct sdp_hh {
194 u8 bsdh[16];
195 u8 sdp_version; /* Major version: 7:4 */
196 u8 ip_version; /* IP version: 7:4 */
197 u8 sdp_specific1[10];
198 __be16 port;
199 __be16 sdp_specific2;
200 union cma_ip_addr src_addr;
201 union cma_ip_addr dst_addr;
202 };
203
204 struct sdp_hah {
205 u8 bsdh[16];
206 u8 sdp_version;
207 };
208
209 #define CMA_VERSION 0x00
210 #define SDP_MAJ_VERSION 0x2
211
212 static int cma_comp(struct rdma_id_private *id_priv, enum cma_state comp)
213 {
214 unsigned long flags;
215 int ret;
216
217 spin_lock_irqsave(&id_priv->lock, flags);
218 ret = (id_priv->state == comp);
219 spin_unlock_irqrestore(&id_priv->lock, flags);
220 return ret;
221 }
222
223 static int cma_comp_exch(struct rdma_id_private *id_priv,
224 enum cma_state comp, enum cma_state exch)
225 {
226 unsigned long flags;
227 int ret;
228
229 spin_lock_irqsave(&id_priv->lock, flags);
230 if ((ret = (id_priv->state == comp)))
231 id_priv->state = exch;
232 spin_unlock_irqrestore(&id_priv->lock, flags);
233 return ret;
234 }
235
236 static enum cma_state cma_exch(struct rdma_id_private *id_priv,
237 enum cma_state exch)
238 {
239 unsigned long flags;
240 enum cma_state old;
241
242 spin_lock_irqsave(&id_priv->lock, flags);
243 old = id_priv->state;
244 id_priv->state = exch;
245 spin_unlock_irqrestore(&id_priv->lock, flags);
246 return old;
247 }
248
249 static inline u8 cma_get_ip_ver(struct cma_hdr *hdr)
250 {
251 return hdr->ip_version >> 4;
252 }
253
254 static inline void cma_set_ip_ver(struct cma_hdr *hdr, u8 ip_ver)
255 {
256 hdr->ip_version = (ip_ver << 4) | (hdr->ip_version & 0xF);
257 }
258
259 static inline u8 sdp_get_majv(u8 sdp_version)
260 {
261 return sdp_version >> 4;
262 }
263
264 static inline u8 sdp_get_ip_ver(struct sdp_hh *hh)
265 {
266 return hh->ip_version >> 4;
267 }
268
269 static inline void sdp_set_ip_ver(struct sdp_hh *hh, u8 ip_ver)
270 {
271 hh->ip_version = (ip_ver << 4) | (hh->ip_version & 0xF);
272 }
273
274 static inline int cma_is_ud_ps(enum rdma_port_space ps)
275 {
276 return (ps == RDMA_PS_UDP || ps == RDMA_PS_IPOIB);
277 }
278
279 static void cma_attach_to_dev(struct rdma_id_private *id_priv,
280 struct cma_device *cma_dev)
281 {
282 atomic_inc(&cma_dev->refcount);
283 id_priv->cma_dev = cma_dev;
284 id_priv->id.device = cma_dev->device;
285 list_add_tail(&id_priv->list, &cma_dev->id_list);
286 }
287
288 static inline void cma_deref_dev(struct cma_device *cma_dev)
289 {
290 if (atomic_dec_and_test(&cma_dev->refcount))
291 complete(&cma_dev->comp);
292 }
293
294 static void cma_detach_from_dev(struct rdma_id_private *id_priv)
295 {
296 list_del(&id_priv->list);
297 cma_deref_dev(id_priv->cma_dev);
298 id_priv->cma_dev = NULL;
299 }
300
301 static int cma_set_qkey(struct ib_device *device, u8 port_num,
302 enum rdma_port_space ps,
303 struct rdma_dev_addr *dev_addr, u32 *qkey)
304 {
305 struct ib_sa_mcmember_rec rec;
306 int ret = 0;
307
308 switch (ps) {
309 case RDMA_PS_UDP:
310 *qkey = RDMA_UDP_QKEY;
311 break;
312 case RDMA_PS_IPOIB:
313 ib_addr_get_mgid(dev_addr, &rec.mgid);
314 ret = ib_sa_get_mcmember_rec(device, port_num, &rec.mgid, &rec);
315 *qkey = be32_to_cpu(rec.qkey);
316 break;
317 default:
318 break;
319 }
320 return ret;
321 }
322
323 static int cma_acquire_dev(struct rdma_id_private *id_priv)
324 {
325 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
326 struct cma_device *cma_dev;
327 union ib_gid gid;
328 int ret = -ENODEV;
329
330 switch (rdma_node_get_transport(dev_addr->dev_type)) {
331 case RDMA_TRANSPORT_IB:
332 ib_addr_get_sgid(dev_addr, &gid);
333 break;
334 case RDMA_TRANSPORT_IWARP:
335 iw_addr_get_sgid(dev_addr, &gid);
336 break;
337 default:
338 return -ENODEV;
339 }
340
341 list_for_each_entry(cma_dev, &dev_list, list) {
342 ret = ib_find_cached_gid(cma_dev->device, &gid,
343 &id_priv->id.port_num, NULL);
344 if (!ret) {
345 ret = cma_set_qkey(cma_dev->device,
346 id_priv->id.port_num,
347 id_priv->id.ps, dev_addr,
348 &id_priv->qkey);
349 if (!ret)
350 cma_attach_to_dev(id_priv, cma_dev);
351 break;
352 }
353 }
354 return ret;
355 }
356
357 static void cma_deref_id(struct rdma_id_private *id_priv)
358 {
359 if (atomic_dec_and_test(&id_priv->refcount))
360 complete(&id_priv->comp);
361 }
362
363 static int cma_disable_callback(struct rdma_id_private *id_priv,
364 enum cma_state state)
365 {
366 mutex_lock(&id_priv->handler_mutex);
367 if (id_priv->state != state) {
368 mutex_unlock(&id_priv->handler_mutex);
369 return -EINVAL;
370 }
371 return 0;
372 }
373
374 static int cma_has_cm_dev(struct rdma_id_private *id_priv)
375 {
376 return (id_priv->id.device && id_priv->cm_id.ib);
377 }
378
379 struct rdma_cm_id *rdma_create_id(rdma_cm_event_handler event_handler,
380 void *context, enum rdma_port_space ps)
381 {
382 struct rdma_id_private *id_priv;
383
384 id_priv = kzalloc(sizeof *id_priv, GFP_KERNEL);
385 if (!id_priv)
386 return ERR_PTR(-ENOMEM);
387
388 id_priv->state = CMA_IDLE;
389 id_priv->id.context = context;
390 id_priv->id.event_handler = event_handler;
391 id_priv->id.ps = ps;
392 spin_lock_init(&id_priv->lock);
393 mutex_init(&id_priv->qp_mutex);
394 init_completion(&id_priv->comp);
395 atomic_set(&id_priv->refcount, 1);
396 mutex_init(&id_priv->handler_mutex);
397 INIT_LIST_HEAD(&id_priv->listen_list);
398 INIT_LIST_HEAD(&id_priv->mc_list);
399 get_random_bytes(&id_priv->seq_num, sizeof id_priv->seq_num);
400
401 return &id_priv->id;
402 }
403 EXPORT_SYMBOL(rdma_create_id);
404
405 static int cma_init_ud_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
406 {
407 struct ib_qp_attr qp_attr;
408 int qp_attr_mask, ret;
409
410 qp_attr.qp_state = IB_QPS_INIT;
411 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
412 if (ret)
413 return ret;
414
415 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
416 if (ret)
417 return ret;
418
419 qp_attr.qp_state = IB_QPS_RTR;
420 ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE);
421 if (ret)
422 return ret;
423
424 qp_attr.qp_state = IB_QPS_RTS;
425 qp_attr.sq_psn = 0;
426 ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE | IB_QP_SQ_PSN);
427
428 return ret;
429 }
430
431 static int cma_init_conn_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
432 {
433 struct ib_qp_attr qp_attr;
434 int qp_attr_mask, ret;
435
436 qp_attr.qp_state = IB_QPS_INIT;
437 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
438 if (ret)
439 return ret;
440
441 return ib_modify_qp(qp, &qp_attr, qp_attr_mask);
442 }
443
444 int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd,
445 struct ib_qp_init_attr *qp_init_attr)
446 {
447 struct rdma_id_private *id_priv;
448 struct ib_qp *qp;
449 int ret;
450
451 id_priv = container_of(id, struct rdma_id_private, id);
452 if (id->device != pd->device)
453 return -EINVAL;
454
455 qp = ib_create_qp(pd, qp_init_attr);
456 if (IS_ERR(qp))
457 return PTR_ERR(qp);
458
459 if (cma_is_ud_ps(id_priv->id.ps))
460 ret = cma_init_ud_qp(id_priv, qp);
461 else
462 ret = cma_init_conn_qp(id_priv, qp);
463 if (ret)
464 goto err;
465
466 id->qp = qp;
467 id_priv->qp_num = qp->qp_num;
468 id_priv->srq = (qp->srq != NULL);
469 return 0;
470 err:
471 ib_destroy_qp(qp);
472 return ret;
473 }
474 EXPORT_SYMBOL(rdma_create_qp);
475
476 void rdma_destroy_qp(struct rdma_cm_id *id)
477 {
478 struct rdma_id_private *id_priv;
479
480 id_priv = container_of(id, struct rdma_id_private, id);
481 mutex_lock(&id_priv->qp_mutex);
482 ib_destroy_qp(id_priv->id.qp);
483 id_priv->id.qp = NULL;
484 mutex_unlock(&id_priv->qp_mutex);
485 }
486 EXPORT_SYMBOL(rdma_destroy_qp);
487
488 static int cma_modify_qp_rtr(struct rdma_id_private *id_priv,
489 struct rdma_conn_param *conn_param)
490 {
491 struct ib_qp_attr qp_attr;
492 int qp_attr_mask, ret;
493
494 mutex_lock(&id_priv->qp_mutex);
495 if (!id_priv->id.qp) {
496 ret = 0;
497 goto out;
498 }
499
500 /* Need to update QP attributes from default values. */
501 qp_attr.qp_state = IB_QPS_INIT;
502 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
503 if (ret)
504 goto out;
505
506 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
507 if (ret)
508 goto out;
509
510 qp_attr.qp_state = IB_QPS_RTR;
511 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
512 if (ret)
513 goto out;
514
515 if (conn_param)
516 qp_attr.max_dest_rd_atomic = conn_param->responder_resources;
517 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
518 out:
519 mutex_unlock(&id_priv->qp_mutex);
520 return ret;
521 }
522
523 static int cma_modify_qp_rts(struct rdma_id_private *id_priv,
524 struct rdma_conn_param *conn_param)
525 {
526 struct ib_qp_attr qp_attr;
527 int qp_attr_mask, ret;
528
529 mutex_lock(&id_priv->qp_mutex);
530 if (!id_priv->id.qp) {
531 ret = 0;
532 goto out;
533 }
534
535 qp_attr.qp_state = IB_QPS_RTS;
536 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
537 if (ret)
538 goto out;
539
540 if (conn_param)
541 qp_attr.max_rd_atomic = conn_param->initiator_depth;
542 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
543 out:
544 mutex_unlock(&id_priv->qp_mutex);
545 return ret;
546 }
547
548 static int cma_modify_qp_err(struct rdma_id_private *id_priv)
549 {
550 struct ib_qp_attr qp_attr;
551 int ret;
552
553 mutex_lock(&id_priv->qp_mutex);
554 if (!id_priv->id.qp) {
555 ret = 0;
556 goto out;
557 }
558
559 qp_attr.qp_state = IB_QPS_ERR;
560 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, IB_QP_STATE);
561 out:
562 mutex_unlock(&id_priv->qp_mutex);
563 return ret;
564 }
565
566 static int cma_ib_init_qp_attr(struct rdma_id_private *id_priv,
567 struct ib_qp_attr *qp_attr, int *qp_attr_mask)
568 {
569 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
570 int ret;
571
572 ret = ib_find_cached_pkey(id_priv->id.device, id_priv->id.port_num,
573 ib_addr_get_pkey(dev_addr),
574 &qp_attr->pkey_index);
575 if (ret)
576 return ret;
577
578 qp_attr->port_num = id_priv->id.port_num;
579 *qp_attr_mask = IB_QP_STATE | IB_QP_PKEY_INDEX | IB_QP_PORT;
580
581 if (cma_is_ud_ps(id_priv->id.ps)) {
582 qp_attr->qkey = id_priv->qkey;
583 *qp_attr_mask |= IB_QP_QKEY;
584 } else {
585 qp_attr->qp_access_flags = 0;
586 *qp_attr_mask |= IB_QP_ACCESS_FLAGS;
587 }
588 return 0;
589 }
590
591 int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
592 int *qp_attr_mask)
593 {
594 struct rdma_id_private *id_priv;
595 int ret = 0;
596
597 id_priv = container_of(id, struct rdma_id_private, id);
598 switch (rdma_node_get_transport(id_priv->id.device->node_type)) {
599 case RDMA_TRANSPORT_IB:
600 if (!id_priv->cm_id.ib || cma_is_ud_ps(id_priv->id.ps))
601 ret = cma_ib_init_qp_attr(id_priv, qp_attr, qp_attr_mask);
602 else
603 ret = ib_cm_init_qp_attr(id_priv->cm_id.ib, qp_attr,
604 qp_attr_mask);
605 if (qp_attr->qp_state == IB_QPS_RTR)
606 qp_attr->rq_psn = id_priv->seq_num;
607 break;
608 case RDMA_TRANSPORT_IWARP:
609 if (!id_priv->cm_id.iw) {
610 qp_attr->qp_access_flags = 0;
611 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS;
612 } else
613 ret = iw_cm_init_qp_attr(id_priv->cm_id.iw, qp_attr,
614 qp_attr_mask);
615 break;
616 default:
617 ret = -ENOSYS;
618 break;
619 }
620
621 return ret;
622 }
623 EXPORT_SYMBOL(rdma_init_qp_attr);
624
625 static inline int cma_zero_addr(struct sockaddr *addr)
626 {
627 struct in6_addr *ip6;
628
629 if (addr->sa_family == AF_INET)
630 return ipv4_is_zeronet(
631 ((struct sockaddr_in *)addr)->sin_addr.s_addr);
632 else {
633 ip6 = &((struct sockaddr_in6 *) addr)->sin6_addr;
634 return (ip6->s6_addr32[0] | ip6->s6_addr32[1] |
635 ip6->s6_addr32[2] | ip6->s6_addr32[3]) == 0;
636 }
637 }
638
639 static inline int cma_loopback_addr(struct sockaddr *addr)
640 {
641 return ipv4_is_loopback(((struct sockaddr_in *) addr)->sin_addr.s_addr);
642 }
643
644 static inline int cma_any_addr(struct sockaddr *addr)
645 {
646 return cma_zero_addr(addr) || cma_loopback_addr(addr);
647 }
648
649 static inline __be16 cma_port(struct sockaddr *addr)
650 {
651 if (addr->sa_family == AF_INET)
652 return ((struct sockaddr_in *) addr)->sin_port;
653 else
654 return ((struct sockaddr_in6 *) addr)->sin6_port;
655 }
656
657 static inline int cma_any_port(struct sockaddr *addr)
658 {
659 return !cma_port(addr);
660 }
661
662 static int cma_get_net_info(void *hdr, enum rdma_port_space ps,
663 u8 *ip_ver, __be16 *port,
664 union cma_ip_addr **src, union cma_ip_addr **dst)
665 {
666 switch (ps) {
667 case RDMA_PS_SDP:
668 if (sdp_get_majv(((struct sdp_hh *) hdr)->sdp_version) !=
669 SDP_MAJ_VERSION)
670 return -EINVAL;
671
672 *ip_ver = sdp_get_ip_ver(hdr);
673 *port = ((struct sdp_hh *) hdr)->port;
674 *src = &((struct sdp_hh *) hdr)->src_addr;
675 *dst = &((struct sdp_hh *) hdr)->dst_addr;
676 break;
677 default:
678 if (((struct cma_hdr *) hdr)->cma_version != CMA_VERSION)
679 return -EINVAL;
680
681 *ip_ver = cma_get_ip_ver(hdr);
682 *port = ((struct cma_hdr *) hdr)->port;
683 *src = &((struct cma_hdr *) hdr)->src_addr;
684 *dst = &((struct cma_hdr *) hdr)->dst_addr;
685 break;
686 }
687
688 if (*ip_ver != 4 && *ip_ver != 6)
689 return -EINVAL;
690 return 0;
691 }
692
693 static void cma_save_net_info(struct rdma_addr *addr,
694 struct rdma_addr *listen_addr,
695 u8 ip_ver, __be16 port,
696 union cma_ip_addr *src, union cma_ip_addr *dst)
697 {
698 struct sockaddr_in *listen4, *ip4;
699 struct sockaddr_in6 *listen6, *ip6;
700
701 switch (ip_ver) {
702 case 4:
703 listen4 = (struct sockaddr_in *) &listen_addr->src_addr;
704 ip4 = (struct sockaddr_in *) &addr->src_addr;
705 ip4->sin_family = listen4->sin_family;
706 ip4->sin_addr.s_addr = dst->ip4.addr;
707 ip4->sin_port = listen4->sin_port;
708
709 ip4 = (struct sockaddr_in *) &addr->dst_addr;
710 ip4->sin_family = listen4->sin_family;
711 ip4->sin_addr.s_addr = src->ip4.addr;
712 ip4->sin_port = port;
713 break;
714 case 6:
715 listen6 = (struct sockaddr_in6 *) &listen_addr->src_addr;
716 ip6 = (struct sockaddr_in6 *) &addr->src_addr;
717 ip6->sin6_family = listen6->sin6_family;
718 ip6->sin6_addr = dst->ip6;
719 ip6->sin6_port = listen6->sin6_port;
720
721 ip6 = (struct sockaddr_in6 *) &addr->dst_addr;
722 ip6->sin6_family = listen6->sin6_family;
723 ip6->sin6_addr = src->ip6;
724 ip6->sin6_port = port;
725 break;
726 default:
727 break;
728 }
729 }
730
731 static inline int cma_user_data_offset(enum rdma_port_space ps)
732 {
733 switch (ps) {
734 case RDMA_PS_SDP:
735 return 0;
736 default:
737 return sizeof(struct cma_hdr);
738 }
739 }
740
741 static void cma_cancel_route(struct rdma_id_private *id_priv)
742 {
743 switch (rdma_node_get_transport(id_priv->id.device->node_type)) {
744 case RDMA_TRANSPORT_IB:
745 if (id_priv->query)
746 ib_sa_cancel_query(id_priv->query_id, id_priv->query);
747 break;
748 default:
749 break;
750 }
751 }
752
753 static void cma_cancel_listens(struct rdma_id_private *id_priv)
754 {
755 struct rdma_id_private *dev_id_priv;
756
757 /*
758 * Remove from listen_any_list to prevent added devices from spawning
759 * additional listen requests.
760 */
761 mutex_lock(&lock);
762 list_del(&id_priv->list);
763
764 while (!list_empty(&id_priv->listen_list)) {
765 dev_id_priv = list_entry(id_priv->listen_list.next,
766 struct rdma_id_private, listen_list);
767 /* sync with device removal to avoid duplicate destruction */
768 list_del_init(&dev_id_priv->list);
769 list_del(&dev_id_priv->listen_list);
770 mutex_unlock(&lock);
771
772 rdma_destroy_id(&dev_id_priv->id);
773 mutex_lock(&lock);
774 }
775 mutex_unlock(&lock);
776 }
777
778 static void cma_cancel_operation(struct rdma_id_private *id_priv,
779 enum cma_state state)
780 {
781 switch (state) {
782 case CMA_ADDR_QUERY:
783 rdma_addr_cancel(&id_priv->id.route.addr.dev_addr);
784 break;
785 case CMA_ROUTE_QUERY:
786 cma_cancel_route(id_priv);
787 break;
788 case CMA_LISTEN:
789 if (cma_any_addr(&id_priv->id.route.addr.src_addr) &&
790 !id_priv->cma_dev)
791 cma_cancel_listens(id_priv);
792 break;
793 default:
794 break;
795 }
796 }
797
798 static void cma_release_port(struct rdma_id_private *id_priv)
799 {
800 struct rdma_bind_list *bind_list = id_priv->bind_list;
801
802 if (!bind_list)
803 return;
804
805 mutex_lock(&lock);
806 hlist_del(&id_priv->node);
807 if (hlist_empty(&bind_list->owners)) {
808 idr_remove(bind_list->ps, bind_list->port);
809 kfree(bind_list);
810 }
811 mutex_unlock(&lock);
812 }
813
814 static void cma_leave_mc_groups(struct rdma_id_private *id_priv)
815 {
816 struct cma_multicast *mc;
817
818 while (!list_empty(&id_priv->mc_list)) {
819 mc = container_of(id_priv->mc_list.next,
820 struct cma_multicast, list);
821 list_del(&mc->list);
822 ib_sa_free_multicast(mc->multicast.ib);
823 kfree(mc);
824 }
825 }
826
827 void rdma_destroy_id(struct rdma_cm_id *id)
828 {
829 struct rdma_id_private *id_priv;
830 enum cma_state state;
831
832 id_priv = container_of(id, struct rdma_id_private, id);
833 state = cma_exch(id_priv, CMA_DESTROYING);
834 cma_cancel_operation(id_priv, state);
835
836 mutex_lock(&lock);
837 if (id_priv->cma_dev) {
838 mutex_unlock(&lock);
839 switch (rdma_node_get_transport(id->device->node_type)) {
840 case RDMA_TRANSPORT_IB:
841 if (id_priv->cm_id.ib && !IS_ERR(id_priv->cm_id.ib))
842 ib_destroy_cm_id(id_priv->cm_id.ib);
843 break;
844 case RDMA_TRANSPORT_IWARP:
845 if (id_priv->cm_id.iw && !IS_ERR(id_priv->cm_id.iw))
846 iw_destroy_cm_id(id_priv->cm_id.iw);
847 break;
848 default:
849 break;
850 }
851 cma_leave_mc_groups(id_priv);
852 mutex_lock(&lock);
853 cma_detach_from_dev(id_priv);
854 }
855 mutex_unlock(&lock);
856
857 cma_release_port(id_priv);
858 cma_deref_id(id_priv);
859 wait_for_completion(&id_priv->comp);
860
861 if (id_priv->internal_id)
862 cma_deref_id(id_priv->id.context);
863
864 kfree(id_priv->id.route.path_rec);
865 kfree(id_priv);
866 }
867 EXPORT_SYMBOL(rdma_destroy_id);
868
869 static int cma_rep_recv(struct rdma_id_private *id_priv)
870 {
871 int ret;
872
873 ret = cma_modify_qp_rtr(id_priv, NULL);
874 if (ret)
875 goto reject;
876
877 ret = cma_modify_qp_rts(id_priv, NULL);
878 if (ret)
879 goto reject;
880
881 ret = ib_send_cm_rtu(id_priv->cm_id.ib, NULL, 0);
882 if (ret)
883 goto reject;
884
885 return 0;
886 reject:
887 cma_modify_qp_err(id_priv);
888 ib_send_cm_rej(id_priv->cm_id.ib, IB_CM_REJ_CONSUMER_DEFINED,
889 NULL, 0, NULL, 0);
890 return ret;
891 }
892
893 static int cma_verify_rep(struct rdma_id_private *id_priv, void *data)
894 {
895 if (id_priv->id.ps == RDMA_PS_SDP &&
896 sdp_get_majv(((struct sdp_hah *) data)->sdp_version) !=
897 SDP_MAJ_VERSION)
898 return -EINVAL;
899
900 return 0;
901 }
902
903 static void cma_set_rep_event_data(struct rdma_cm_event *event,
904 struct ib_cm_rep_event_param *rep_data,
905 void *private_data)
906 {
907 event->param.conn.private_data = private_data;
908 event->param.conn.private_data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
909 event->param.conn.responder_resources = rep_data->responder_resources;
910 event->param.conn.initiator_depth = rep_data->initiator_depth;
911 event->param.conn.flow_control = rep_data->flow_control;
912 event->param.conn.rnr_retry_count = rep_data->rnr_retry_count;
913 event->param.conn.srq = rep_data->srq;
914 event->param.conn.qp_num = rep_data->remote_qpn;
915 }
916
917 static int cma_ib_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
918 {
919 struct rdma_id_private *id_priv = cm_id->context;
920 struct rdma_cm_event event;
921 int ret = 0;
922
923 if ((ib_event->event != IB_CM_TIMEWAIT_EXIT &&
924 cma_disable_callback(id_priv, CMA_CONNECT)) ||
925 (ib_event->event == IB_CM_TIMEWAIT_EXIT &&
926 cma_disable_callback(id_priv, CMA_DISCONNECT)))
927 return 0;
928
929 memset(&event, 0, sizeof event);
930 switch (ib_event->event) {
931 case IB_CM_REQ_ERROR:
932 case IB_CM_REP_ERROR:
933 event.event = RDMA_CM_EVENT_UNREACHABLE;
934 event.status = -ETIMEDOUT;
935 break;
936 case IB_CM_REP_RECEIVED:
937 event.status = cma_verify_rep(id_priv, ib_event->private_data);
938 if (event.status)
939 event.event = RDMA_CM_EVENT_CONNECT_ERROR;
940 else if (id_priv->id.qp && id_priv->id.ps != RDMA_PS_SDP) {
941 event.status = cma_rep_recv(id_priv);
942 event.event = event.status ? RDMA_CM_EVENT_CONNECT_ERROR :
943 RDMA_CM_EVENT_ESTABLISHED;
944 } else
945 event.event = RDMA_CM_EVENT_CONNECT_RESPONSE;
946 cma_set_rep_event_data(&event, &ib_event->param.rep_rcvd,
947 ib_event->private_data);
948 break;
949 case IB_CM_RTU_RECEIVED:
950 case IB_CM_USER_ESTABLISHED:
951 event.event = RDMA_CM_EVENT_ESTABLISHED;
952 break;
953 case IB_CM_DREQ_ERROR:
954 event.status = -ETIMEDOUT; /* fall through */
955 case IB_CM_DREQ_RECEIVED:
956 case IB_CM_DREP_RECEIVED:
957 if (!cma_comp_exch(id_priv, CMA_CONNECT, CMA_DISCONNECT))
958 goto out;
959 event.event = RDMA_CM_EVENT_DISCONNECTED;
960 break;
961 case IB_CM_TIMEWAIT_EXIT:
962 event.event = RDMA_CM_EVENT_TIMEWAIT_EXIT;
963 break;
964 case IB_CM_MRA_RECEIVED:
965 /* ignore event */
966 goto out;
967 case IB_CM_REJ_RECEIVED:
968 cma_modify_qp_err(id_priv);
969 event.status = ib_event->param.rej_rcvd.reason;
970 event.event = RDMA_CM_EVENT_REJECTED;
971 event.param.conn.private_data = ib_event->private_data;
972 event.param.conn.private_data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
973 break;
974 default:
975 printk(KERN_ERR "RDMA CMA: unexpected IB CM event: %d\n",
976 ib_event->event);
977 goto out;
978 }
979
980 ret = id_priv->id.event_handler(&id_priv->id, &event);
981 if (ret) {
982 /* Destroy the CM ID by returning a non-zero value. */
983 id_priv->cm_id.ib = NULL;
984 cma_exch(id_priv, CMA_DESTROYING);
985 mutex_unlock(&id_priv->handler_mutex);
986 rdma_destroy_id(&id_priv->id);
987 return ret;
988 }
989 out:
990 mutex_unlock(&id_priv->handler_mutex);
991 return ret;
992 }
993
994 static struct rdma_id_private *cma_new_conn_id(struct rdma_cm_id *listen_id,
995 struct ib_cm_event *ib_event)
996 {
997 struct rdma_id_private *id_priv;
998 struct rdma_cm_id *id;
999 struct rdma_route *rt;
1000 union cma_ip_addr *src, *dst;
1001 __be16 port;
1002 u8 ip_ver;
1003 int ret;
1004
1005 if (cma_get_net_info(ib_event->private_data, listen_id->ps,
1006 &ip_ver, &port, &src, &dst))
1007 goto err;
1008
1009 id = rdma_create_id(listen_id->event_handler, listen_id->context,
1010 listen_id->ps);
1011 if (IS_ERR(id))
1012 goto err;
1013
1014 cma_save_net_info(&id->route.addr, &listen_id->route.addr,
1015 ip_ver, port, src, dst);
1016
1017 rt = &id->route;
1018 rt->num_paths = ib_event->param.req_rcvd.alternate_path ? 2 : 1;
1019 rt->path_rec = kmalloc(sizeof *rt->path_rec * rt->num_paths,
1020 GFP_KERNEL);
1021 if (!rt->path_rec)
1022 goto destroy_id;
1023
1024 rt->path_rec[0] = *ib_event->param.req_rcvd.primary_path;
1025 if (rt->num_paths == 2)
1026 rt->path_rec[1] = *ib_event->param.req_rcvd.alternate_path;
1027
1028 ib_addr_set_dgid(&rt->addr.dev_addr, &rt->path_rec[0].dgid);
1029 ret = rdma_translate_ip(&id->route.addr.src_addr,
1030 &id->route.addr.dev_addr);
1031 if (ret)
1032 goto destroy_id;
1033
1034 id_priv = container_of(id, struct rdma_id_private, id);
1035 id_priv->state = CMA_CONNECT;
1036 return id_priv;
1037
1038 destroy_id:
1039 rdma_destroy_id(id);
1040 err:
1041 return NULL;
1042 }
1043
1044 static struct rdma_id_private *cma_new_udp_id(struct rdma_cm_id *listen_id,
1045 struct ib_cm_event *ib_event)
1046 {
1047 struct rdma_id_private *id_priv;
1048 struct rdma_cm_id *id;
1049 union cma_ip_addr *src, *dst;
1050 __be16 port;
1051 u8 ip_ver;
1052 int ret;
1053
1054 id = rdma_create_id(listen_id->event_handler, listen_id->context,
1055 listen_id->ps);
1056 if (IS_ERR(id))
1057 return NULL;
1058
1059
1060 if (cma_get_net_info(ib_event->private_data, listen_id->ps,
1061 &ip_ver, &port, &src, &dst))
1062 goto err;
1063
1064 cma_save_net_info(&id->route.addr, &listen_id->route.addr,
1065 ip_ver, port, src, dst);
1066
1067 ret = rdma_translate_ip(&id->route.addr.src_addr,
1068 &id->route.addr.dev_addr);
1069 if (ret)
1070 goto err;
1071
1072 id_priv = container_of(id, struct rdma_id_private, id);
1073 id_priv->state = CMA_CONNECT;
1074 return id_priv;
1075 err:
1076 rdma_destroy_id(id);
1077 return NULL;
1078 }
1079
1080 static void cma_set_req_event_data(struct rdma_cm_event *event,
1081 struct ib_cm_req_event_param *req_data,
1082 void *private_data, int offset)
1083 {
1084 event->param.conn.private_data = private_data + offset;
1085 event->param.conn.private_data_len = IB_CM_REQ_PRIVATE_DATA_SIZE - offset;
1086 event->param.conn.responder_resources = req_data->responder_resources;
1087 event->param.conn.initiator_depth = req_data->initiator_depth;
1088 event->param.conn.flow_control = req_data->flow_control;
1089 event->param.conn.retry_count = req_data->retry_count;
1090 event->param.conn.rnr_retry_count = req_data->rnr_retry_count;
1091 event->param.conn.srq = req_data->srq;
1092 event->param.conn.qp_num = req_data->remote_qpn;
1093 }
1094
1095 static int cma_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
1096 {
1097 struct rdma_id_private *listen_id, *conn_id;
1098 struct rdma_cm_event event;
1099 int offset, ret;
1100
1101 listen_id = cm_id->context;
1102 if (cma_disable_callback(listen_id, CMA_LISTEN))
1103 return -ECONNABORTED;
1104
1105 memset(&event, 0, sizeof event);
1106 offset = cma_user_data_offset(listen_id->id.ps);
1107 event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
1108 if (cma_is_ud_ps(listen_id->id.ps)) {
1109 conn_id = cma_new_udp_id(&listen_id->id, ib_event);
1110 event.param.ud.private_data = ib_event->private_data + offset;
1111 event.param.ud.private_data_len =
1112 IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE - offset;
1113 } else {
1114 conn_id = cma_new_conn_id(&listen_id->id, ib_event);
1115 cma_set_req_event_data(&event, &ib_event->param.req_rcvd,
1116 ib_event->private_data, offset);
1117 }
1118 if (!conn_id) {
1119 ret = -ENOMEM;
1120 goto out;
1121 }
1122
1123 mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
1124 mutex_lock(&lock);
1125 ret = cma_acquire_dev(conn_id);
1126 mutex_unlock(&lock);
1127 if (ret)
1128 goto release_conn_id;
1129
1130 conn_id->cm_id.ib = cm_id;
1131 cm_id->context = conn_id;
1132 cm_id->cm_handler = cma_ib_handler;
1133
1134 ret = conn_id->id.event_handler(&conn_id->id, &event);
1135 if (!ret) {
1136 /*
1137 * Acquire mutex to prevent user executing rdma_destroy_id()
1138 * while we're accessing the cm_id.
1139 */
1140 mutex_lock(&lock);
1141 if (cma_comp(conn_id, CMA_CONNECT) &&
1142 !cma_is_ud_ps(conn_id->id.ps))
1143 ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0);
1144 mutex_unlock(&lock);
1145 mutex_unlock(&conn_id->handler_mutex);
1146 goto out;
1147 }
1148
1149 /* Destroy the CM ID by returning a non-zero value. */
1150 conn_id->cm_id.ib = NULL;
1151
1152 release_conn_id:
1153 cma_exch(conn_id, CMA_DESTROYING);
1154 mutex_unlock(&conn_id->handler_mutex);
1155 rdma_destroy_id(&conn_id->id);
1156
1157 out:
1158 mutex_unlock(&listen_id->handler_mutex);
1159 return ret;
1160 }
1161
1162 static __be64 cma_get_service_id(enum rdma_port_space ps, struct sockaddr *addr)
1163 {
1164 return cpu_to_be64(((u64)ps << 16) + be16_to_cpu(cma_port(addr)));
1165 }
1166
1167 static void cma_set_compare_data(enum rdma_port_space ps, struct sockaddr *addr,
1168 struct ib_cm_compare_data *compare)
1169 {
1170 struct cma_hdr *cma_data, *cma_mask;
1171 struct sdp_hh *sdp_data, *sdp_mask;
1172 __be32 ip4_addr;
1173 struct in6_addr ip6_addr;
1174
1175 memset(compare, 0, sizeof *compare);
1176 cma_data = (void *) compare->data;
1177 cma_mask = (void *) compare->mask;
1178 sdp_data = (void *) compare->data;
1179 sdp_mask = (void *) compare->mask;
1180
1181 switch (addr->sa_family) {
1182 case AF_INET:
1183 ip4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
1184 if (ps == RDMA_PS_SDP) {
1185 sdp_set_ip_ver(sdp_data, 4);
1186 sdp_set_ip_ver(sdp_mask, 0xF);
1187 sdp_data->dst_addr.ip4.addr = ip4_addr;
1188 sdp_mask->dst_addr.ip4.addr = htonl(~0);
1189 } else {
1190 cma_set_ip_ver(cma_data, 4);
1191 cma_set_ip_ver(cma_mask, 0xF);
1192 cma_data->dst_addr.ip4.addr = ip4_addr;
1193 cma_mask->dst_addr.ip4.addr = htonl(~0);
1194 }
1195 break;
1196 case AF_INET6:
1197 ip6_addr = ((struct sockaddr_in6 *) addr)->sin6_addr;
1198 if (ps == RDMA_PS_SDP) {
1199 sdp_set_ip_ver(sdp_data, 6);
1200 sdp_set_ip_ver(sdp_mask, 0xF);
1201 sdp_data->dst_addr.ip6 = ip6_addr;
1202 memset(&sdp_mask->dst_addr.ip6, 0xFF,
1203 sizeof sdp_mask->dst_addr.ip6);
1204 } else {
1205 cma_set_ip_ver(cma_data, 6);
1206 cma_set_ip_ver(cma_mask, 0xF);
1207 cma_data->dst_addr.ip6 = ip6_addr;
1208 memset(&cma_mask->dst_addr.ip6, 0xFF,
1209 sizeof cma_mask->dst_addr.ip6);
1210 }
1211 break;
1212 default:
1213 break;
1214 }
1215 }
1216
1217 static int cma_iw_handler(struct iw_cm_id *iw_id, struct iw_cm_event *iw_event)
1218 {
1219 struct rdma_id_private *id_priv = iw_id->context;
1220 struct rdma_cm_event event;
1221 struct sockaddr_in *sin;
1222 int ret = 0;
1223
1224 if (cma_disable_callback(id_priv, CMA_CONNECT))
1225 return 0;
1226
1227 memset(&event, 0, sizeof event);
1228 switch (iw_event->event) {
1229 case IW_CM_EVENT_CLOSE:
1230 event.event = RDMA_CM_EVENT_DISCONNECTED;
1231 break;
1232 case IW_CM_EVENT_CONNECT_REPLY:
1233 sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
1234 *sin = iw_event->local_addr;
1235 sin = (struct sockaddr_in *) &id_priv->id.route.addr.dst_addr;
1236 *sin = iw_event->remote_addr;
1237 switch (iw_event->status) {
1238 case 0:
1239 event.event = RDMA_CM_EVENT_ESTABLISHED;
1240 break;
1241 case -ECONNRESET:
1242 case -ECONNREFUSED:
1243 event.event = RDMA_CM_EVENT_REJECTED;
1244 break;
1245 case -ETIMEDOUT:
1246 event.event = RDMA_CM_EVENT_UNREACHABLE;
1247 break;
1248 default:
1249 event.event = RDMA_CM_EVENT_CONNECT_ERROR;
1250 break;
1251 }
1252 break;
1253 case IW_CM_EVENT_ESTABLISHED:
1254 event.event = RDMA_CM_EVENT_ESTABLISHED;
1255 break;
1256 default:
1257 BUG_ON(1);
1258 }
1259
1260 event.status = iw_event->status;
1261 event.param.conn.private_data = iw_event->private_data;
1262 event.param.conn.private_data_len = iw_event->private_data_len;
1263 ret = id_priv->id.event_handler(&id_priv->id, &event);
1264 if (ret) {
1265 /* Destroy the CM ID by returning a non-zero value. */
1266 id_priv->cm_id.iw = NULL;
1267 cma_exch(id_priv, CMA_DESTROYING);
1268 mutex_unlock(&id_priv->handler_mutex);
1269 rdma_destroy_id(&id_priv->id);
1270 return ret;
1271 }
1272
1273 mutex_unlock(&id_priv->handler_mutex);
1274 return ret;
1275 }
1276
1277 static int iw_conn_req_handler(struct iw_cm_id *cm_id,
1278 struct iw_cm_event *iw_event)
1279 {
1280 struct rdma_cm_id *new_cm_id;
1281 struct rdma_id_private *listen_id, *conn_id;
1282 struct sockaddr_in *sin;
1283 struct net_device *dev = NULL;
1284 struct rdma_cm_event event;
1285 int ret;
1286 struct ib_device_attr attr;
1287
1288 listen_id = cm_id->context;
1289 if (cma_disable_callback(listen_id, CMA_LISTEN))
1290 return -ECONNABORTED;
1291
1292 /* Create a new RDMA id for the new IW CM ID */
1293 new_cm_id = rdma_create_id(listen_id->id.event_handler,
1294 listen_id->id.context,
1295 RDMA_PS_TCP);
1296 if (IS_ERR(new_cm_id)) {
1297 ret = -ENOMEM;
1298 goto out;
1299 }
1300 conn_id = container_of(new_cm_id, struct rdma_id_private, id);
1301 mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
1302 conn_id->state = CMA_CONNECT;
1303
1304 dev = ip_dev_find(&init_net, iw_event->local_addr.sin_addr.s_addr);
1305 if (!dev) {
1306 ret = -EADDRNOTAVAIL;
1307 mutex_unlock(&conn_id->handler_mutex);
1308 rdma_destroy_id(new_cm_id);
1309 goto out;
1310 }
1311 ret = rdma_copy_addr(&conn_id->id.route.addr.dev_addr, dev, NULL);
1312 if (ret) {
1313 mutex_unlock(&conn_id->handler_mutex);
1314 rdma_destroy_id(new_cm_id);
1315 goto out;
1316 }
1317
1318 mutex_lock(&lock);
1319 ret = cma_acquire_dev(conn_id);
1320 mutex_unlock(&lock);
1321 if (ret) {
1322 mutex_unlock(&conn_id->handler_mutex);
1323 rdma_destroy_id(new_cm_id);
1324 goto out;
1325 }
1326
1327 conn_id->cm_id.iw = cm_id;
1328 cm_id->context = conn_id;
1329 cm_id->cm_handler = cma_iw_handler;
1330
1331 sin = (struct sockaddr_in *) &new_cm_id->route.addr.src_addr;
1332 *sin = iw_event->local_addr;
1333 sin = (struct sockaddr_in *) &new_cm_id->route.addr.dst_addr;
1334 *sin = iw_event->remote_addr;
1335
1336 ret = ib_query_device(conn_id->id.device, &attr);
1337 if (ret) {
1338 mutex_unlock(&conn_id->handler_mutex);
1339 rdma_destroy_id(new_cm_id);
1340 goto out;
1341 }
1342
1343 memset(&event, 0, sizeof event);
1344 event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
1345 event.param.conn.private_data = iw_event->private_data;
1346 event.param.conn.private_data_len = iw_event->private_data_len;
1347 event.param.conn.initiator_depth = attr.max_qp_init_rd_atom;
1348 event.param.conn.responder_resources = attr.max_qp_rd_atom;
1349 ret = conn_id->id.event_handler(&conn_id->id, &event);
1350 if (ret) {
1351 /* User wants to destroy the CM ID */
1352 conn_id->cm_id.iw = NULL;
1353 cma_exch(conn_id, CMA_DESTROYING);
1354 mutex_unlock(&conn_id->handler_mutex);
1355 rdma_destroy_id(&conn_id->id);
1356 goto out;
1357 }
1358
1359 mutex_unlock(&conn_id->handler_mutex);
1360
1361 out:
1362 if (dev)
1363 dev_put(dev);
1364 mutex_unlock(&listen_id->handler_mutex);
1365 return ret;
1366 }
1367
1368 static int cma_ib_listen(struct rdma_id_private *id_priv)
1369 {
1370 struct ib_cm_compare_data compare_data;
1371 struct sockaddr *addr;
1372 __be64 svc_id;
1373 int ret;
1374
1375 id_priv->cm_id.ib = ib_create_cm_id(id_priv->id.device, cma_req_handler,
1376 id_priv);
1377 if (IS_ERR(id_priv->cm_id.ib))
1378 return PTR_ERR(id_priv->cm_id.ib);
1379
1380 addr = &id_priv->id.route.addr.src_addr;
1381 svc_id = cma_get_service_id(id_priv->id.ps, addr);
1382 if (cma_any_addr(addr))
1383 ret = ib_cm_listen(id_priv->cm_id.ib, svc_id, 0, NULL);
1384 else {
1385 cma_set_compare_data(id_priv->id.ps, addr, &compare_data);
1386 ret = ib_cm_listen(id_priv->cm_id.ib, svc_id, 0, &compare_data);
1387 }
1388
1389 if (ret) {
1390 ib_destroy_cm_id(id_priv->cm_id.ib);
1391 id_priv->cm_id.ib = NULL;
1392 }
1393
1394 return ret;
1395 }
1396
1397 static int cma_iw_listen(struct rdma_id_private *id_priv, int backlog)
1398 {
1399 int ret;
1400 struct sockaddr_in *sin;
1401
1402 id_priv->cm_id.iw = iw_create_cm_id(id_priv->id.device,
1403 iw_conn_req_handler,
1404 id_priv);
1405 if (IS_ERR(id_priv->cm_id.iw))
1406 return PTR_ERR(id_priv->cm_id.iw);
1407
1408 sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
1409 id_priv->cm_id.iw->local_addr = *sin;
1410
1411 ret = iw_cm_listen(id_priv->cm_id.iw, backlog);
1412
1413 if (ret) {
1414 iw_destroy_cm_id(id_priv->cm_id.iw);
1415 id_priv->cm_id.iw = NULL;
1416 }
1417
1418 return ret;
1419 }
1420
1421 static int cma_listen_handler(struct rdma_cm_id *id,
1422 struct rdma_cm_event *event)
1423 {
1424 struct rdma_id_private *id_priv = id->context;
1425
1426 id->context = id_priv->id.context;
1427 id->event_handler = id_priv->id.event_handler;
1428 return id_priv->id.event_handler(id, event);
1429 }
1430
1431 static void cma_listen_on_dev(struct rdma_id_private *id_priv,
1432 struct cma_device *cma_dev)
1433 {
1434 struct rdma_id_private *dev_id_priv;
1435 struct rdma_cm_id *id;
1436 int ret;
1437
1438 id = rdma_create_id(cma_listen_handler, id_priv, id_priv->id.ps);
1439 if (IS_ERR(id))
1440 return;
1441
1442 dev_id_priv = container_of(id, struct rdma_id_private, id);
1443
1444 dev_id_priv->state = CMA_ADDR_BOUND;
1445 memcpy(&id->route.addr.src_addr, &id_priv->id.route.addr.src_addr,
1446 ip_addr_size(&id_priv->id.route.addr.src_addr));
1447
1448 cma_attach_to_dev(dev_id_priv, cma_dev);
1449 list_add_tail(&dev_id_priv->listen_list, &id_priv->listen_list);
1450 atomic_inc(&id_priv->refcount);
1451 dev_id_priv->internal_id = 1;
1452
1453 ret = rdma_listen(id, id_priv->backlog);
1454 if (ret)
1455 printk(KERN_WARNING "RDMA CMA: cma_listen_on_dev, error %d, "
1456 "listening on device %s\n", ret, cma_dev->device->name);
1457 }
1458
1459 static void cma_listen_on_all(struct rdma_id_private *id_priv)
1460 {
1461 struct cma_device *cma_dev;
1462
1463 mutex_lock(&lock);
1464 list_add_tail(&id_priv->list, &listen_any_list);
1465 list_for_each_entry(cma_dev, &dev_list, list)
1466 cma_listen_on_dev(id_priv, cma_dev);
1467 mutex_unlock(&lock);
1468 }
1469
1470 static int cma_bind_any(struct rdma_cm_id *id, sa_family_t af)
1471 {
1472 struct sockaddr_in addr_in;
1473
1474 memset(&addr_in, 0, sizeof addr_in);
1475 addr_in.sin_family = af;
1476 return rdma_bind_addr(id, (struct sockaddr *) &addr_in);
1477 }
1478
1479 int rdma_listen(struct rdma_cm_id *id, int backlog)
1480 {
1481 struct rdma_id_private *id_priv;
1482 int ret;
1483
1484 id_priv = container_of(id, struct rdma_id_private, id);
1485 if (id_priv->state == CMA_IDLE) {
1486 ret = cma_bind_any(id, AF_INET);
1487 if (ret)
1488 return ret;
1489 }
1490
1491 if (!cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_LISTEN))
1492 return -EINVAL;
1493
1494 id_priv->backlog = backlog;
1495 if (id->device) {
1496 switch (rdma_node_get_transport(id->device->node_type)) {
1497 case RDMA_TRANSPORT_IB:
1498 ret = cma_ib_listen(id_priv);
1499 if (ret)
1500 goto err;
1501 break;
1502 case RDMA_TRANSPORT_IWARP:
1503 ret = cma_iw_listen(id_priv, backlog);
1504 if (ret)
1505 goto err;
1506 break;
1507 default:
1508 ret = -ENOSYS;
1509 goto err;
1510 }
1511 } else
1512 cma_listen_on_all(id_priv);
1513
1514 return 0;
1515 err:
1516 id_priv->backlog = 0;
1517 cma_comp_exch(id_priv, CMA_LISTEN, CMA_ADDR_BOUND);
1518 return ret;
1519 }
1520 EXPORT_SYMBOL(rdma_listen);
1521
1522 void rdma_set_service_type(struct rdma_cm_id *id, int tos)
1523 {
1524 struct rdma_id_private *id_priv;
1525
1526 id_priv = container_of(id, struct rdma_id_private, id);
1527 id_priv->tos = (u8) tos;
1528 }
1529 EXPORT_SYMBOL(rdma_set_service_type);
1530
1531 static void cma_query_handler(int status, struct ib_sa_path_rec *path_rec,
1532 void *context)
1533 {
1534 struct cma_work *work = context;
1535 struct rdma_route *route;
1536
1537 route = &work->id->id.route;
1538
1539 if (!status) {
1540 route->num_paths = 1;
1541 *route->path_rec = *path_rec;
1542 } else {
1543 work->old_state = CMA_ROUTE_QUERY;
1544 work->new_state = CMA_ADDR_RESOLVED;
1545 work->event.event = RDMA_CM_EVENT_ROUTE_ERROR;
1546 work->event.status = status;
1547 }
1548
1549 queue_work(cma_wq, &work->work);
1550 }
1551
1552 static int cma_query_ib_route(struct rdma_id_private *id_priv, int timeout_ms,
1553 struct cma_work *work)
1554 {
1555 struct rdma_addr *addr = &id_priv->id.route.addr;
1556 struct ib_sa_path_rec path_rec;
1557 ib_sa_comp_mask comp_mask;
1558 struct sockaddr_in6 *sin6;
1559
1560 memset(&path_rec, 0, sizeof path_rec);
1561 ib_addr_get_sgid(&addr->dev_addr, &path_rec.sgid);
1562 ib_addr_get_dgid(&addr->dev_addr, &path_rec.dgid);
1563 path_rec.pkey = cpu_to_be16(ib_addr_get_pkey(&addr->dev_addr));
1564 path_rec.numb_path = 1;
1565 path_rec.reversible = 1;
1566 path_rec.service_id = cma_get_service_id(id_priv->id.ps, &addr->dst_addr);
1567
1568 comp_mask = IB_SA_PATH_REC_DGID | IB_SA_PATH_REC_SGID |
1569 IB_SA_PATH_REC_PKEY | IB_SA_PATH_REC_NUMB_PATH |
1570 IB_SA_PATH_REC_REVERSIBLE | IB_SA_PATH_REC_SERVICE_ID;
1571
1572 if (addr->src_addr.sa_family == AF_INET) {
1573 path_rec.qos_class = cpu_to_be16((u16) id_priv->tos);
1574 comp_mask |= IB_SA_PATH_REC_QOS_CLASS;
1575 } else {
1576 sin6 = (struct sockaddr_in6 *) &addr->src_addr;
1577 path_rec.traffic_class = (u8) (be32_to_cpu(sin6->sin6_flowinfo) >> 20);
1578 comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
1579 }
1580
1581 id_priv->query_id = ib_sa_path_rec_get(&sa_client, id_priv->id.device,
1582 id_priv->id.port_num, &path_rec,
1583 comp_mask, timeout_ms,
1584 GFP_KERNEL, cma_query_handler,
1585 work, &id_priv->query);
1586
1587 return (id_priv->query_id < 0) ? id_priv->query_id : 0;
1588 }
1589
1590 static void cma_work_handler(struct work_struct *_work)
1591 {
1592 struct cma_work *work = container_of(_work, struct cma_work, work);
1593 struct rdma_id_private *id_priv = work->id;
1594 int destroy = 0;
1595
1596 mutex_lock(&id_priv->handler_mutex);
1597 if (!cma_comp_exch(id_priv, work->old_state, work->new_state))
1598 goto out;
1599
1600 if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
1601 cma_exch(id_priv, CMA_DESTROYING);
1602 destroy = 1;
1603 }
1604 out:
1605 mutex_unlock(&id_priv->handler_mutex);
1606 cma_deref_id(id_priv);
1607 if (destroy)
1608 rdma_destroy_id(&id_priv->id);
1609 kfree(work);
1610 }
1611
1612 static void cma_ndev_work_handler(struct work_struct *_work)
1613 {
1614 struct cma_ndev_work *work = container_of(_work, struct cma_ndev_work, work);
1615 struct rdma_id_private *id_priv = work->id;
1616 int destroy = 0;
1617
1618 mutex_lock(&id_priv->handler_mutex);
1619 if (id_priv->state == CMA_DESTROYING ||
1620 id_priv->state == CMA_DEVICE_REMOVAL)
1621 goto out;
1622
1623 if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
1624 cma_exch(id_priv, CMA_DESTROYING);
1625 destroy = 1;
1626 }
1627
1628 out:
1629 mutex_unlock(&id_priv->handler_mutex);
1630 cma_deref_id(id_priv);
1631 if (destroy)
1632 rdma_destroy_id(&id_priv->id);
1633 kfree(work);
1634 }
1635
1636 static int cma_resolve_ib_route(struct rdma_id_private *id_priv, int timeout_ms)
1637 {
1638 struct rdma_route *route = &id_priv->id.route;
1639 struct cma_work *work;
1640 int ret;
1641
1642 work = kzalloc(sizeof *work, GFP_KERNEL);
1643 if (!work)
1644 return -ENOMEM;
1645
1646 work->id = id_priv;
1647 INIT_WORK(&work->work, cma_work_handler);
1648 work->old_state = CMA_ROUTE_QUERY;
1649 work->new_state = CMA_ROUTE_RESOLVED;
1650 work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
1651
1652 route->path_rec = kmalloc(sizeof *route->path_rec, GFP_KERNEL);
1653 if (!route->path_rec) {
1654 ret = -ENOMEM;
1655 goto err1;
1656 }
1657
1658 ret = cma_query_ib_route(id_priv, timeout_ms, work);
1659 if (ret)
1660 goto err2;
1661
1662 return 0;
1663 err2:
1664 kfree(route->path_rec);
1665 route->path_rec = NULL;
1666 err1:
1667 kfree(work);
1668 return ret;
1669 }
1670
1671 int rdma_set_ib_paths(struct rdma_cm_id *id,
1672 struct ib_sa_path_rec *path_rec, int num_paths)
1673 {
1674 struct rdma_id_private *id_priv;
1675 int ret;
1676
1677 id_priv = container_of(id, struct rdma_id_private, id);
1678 if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ROUTE_RESOLVED))
1679 return -EINVAL;
1680
1681 id->route.path_rec = kmalloc(sizeof *path_rec * num_paths, GFP_KERNEL);
1682 if (!id->route.path_rec) {
1683 ret = -ENOMEM;
1684 goto err;
1685 }
1686
1687 memcpy(id->route.path_rec, path_rec, sizeof *path_rec * num_paths);
1688 return 0;
1689 err:
1690 cma_comp_exch(id_priv, CMA_ROUTE_RESOLVED, CMA_ADDR_RESOLVED);
1691 return ret;
1692 }
1693 EXPORT_SYMBOL(rdma_set_ib_paths);
1694
1695 static int cma_resolve_iw_route(struct rdma_id_private *id_priv, int timeout_ms)
1696 {
1697 struct cma_work *work;
1698
1699 work = kzalloc(sizeof *work, GFP_KERNEL);
1700 if (!work)
1701 return -ENOMEM;
1702
1703 work->id = id_priv;
1704 INIT_WORK(&work->work, cma_work_handler);
1705 work->old_state = CMA_ROUTE_QUERY;
1706 work->new_state = CMA_ROUTE_RESOLVED;
1707 work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
1708 queue_work(cma_wq, &work->work);
1709 return 0;
1710 }
1711
1712 int rdma_resolve_route(struct rdma_cm_id *id, int timeout_ms)
1713 {
1714 struct rdma_id_private *id_priv;
1715 int ret;
1716
1717 id_priv = container_of(id, struct rdma_id_private, id);
1718 if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ROUTE_QUERY))
1719 return -EINVAL;
1720
1721 atomic_inc(&id_priv->refcount);
1722 switch (rdma_node_get_transport(id->device->node_type)) {
1723 case RDMA_TRANSPORT_IB:
1724 ret = cma_resolve_ib_route(id_priv, timeout_ms);
1725 break;
1726 case RDMA_TRANSPORT_IWARP:
1727 ret = cma_resolve_iw_route(id_priv, timeout_ms);
1728 break;
1729 default:
1730 ret = -ENOSYS;
1731 break;
1732 }
1733 if (ret)
1734 goto err;
1735
1736 return 0;
1737 err:
1738 cma_comp_exch(id_priv, CMA_ROUTE_QUERY, CMA_ADDR_RESOLVED);
1739 cma_deref_id(id_priv);
1740 return ret;
1741 }
1742 EXPORT_SYMBOL(rdma_resolve_route);
1743
1744 static int cma_bind_loopback(struct rdma_id_private *id_priv)
1745 {
1746 struct cma_device *cma_dev;
1747 struct ib_port_attr port_attr;
1748 union ib_gid gid;
1749 u16 pkey;
1750 int ret;
1751 u8 p;
1752
1753 mutex_lock(&lock);
1754 if (list_empty(&dev_list)) {
1755 ret = -ENODEV;
1756 goto out;
1757 }
1758 list_for_each_entry(cma_dev, &dev_list, list)
1759 for (p = 1; p <= cma_dev->device->phys_port_cnt; ++p)
1760 if (!ib_query_port(cma_dev->device, p, &port_attr) &&
1761 port_attr.state == IB_PORT_ACTIVE)
1762 goto port_found;
1763
1764 p = 1;
1765 cma_dev = list_entry(dev_list.next, struct cma_device, list);
1766
1767 port_found:
1768 ret = ib_get_cached_gid(cma_dev->device, p, 0, &gid);
1769 if (ret)
1770 goto out;
1771
1772 ret = ib_get_cached_pkey(cma_dev->device, p, 0, &pkey);
1773 if (ret)
1774 goto out;
1775
1776 ib_addr_set_sgid(&id_priv->id.route.addr.dev_addr, &gid);
1777 ib_addr_set_pkey(&id_priv->id.route.addr.dev_addr, pkey);
1778 id_priv->id.port_num = p;
1779 cma_attach_to_dev(id_priv, cma_dev);
1780 out:
1781 mutex_unlock(&lock);
1782 return ret;
1783 }
1784
1785 static void addr_handler(int status, struct sockaddr *src_addr,
1786 struct rdma_dev_addr *dev_addr, void *context)
1787 {
1788 struct rdma_id_private *id_priv = context;
1789 struct rdma_cm_event event;
1790
1791 memset(&event, 0, sizeof event);
1792 mutex_lock(&id_priv->handler_mutex);
1793
1794 /*
1795 * Grab mutex to block rdma_destroy_id() from removing the device while
1796 * we're trying to acquire it.
1797 */
1798 mutex_lock(&lock);
1799 if (!cma_comp_exch(id_priv, CMA_ADDR_QUERY, CMA_ADDR_RESOLVED)) {
1800 mutex_unlock(&lock);
1801 goto out;
1802 }
1803
1804 if (!status && !id_priv->cma_dev)
1805 status = cma_acquire_dev(id_priv);
1806 mutex_unlock(&lock);
1807
1808 if (status) {
1809 if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ADDR_BOUND))
1810 goto out;
1811 event.event = RDMA_CM_EVENT_ADDR_ERROR;
1812 event.status = status;
1813 } else {
1814 memcpy(&id_priv->id.route.addr.src_addr, src_addr,
1815 ip_addr_size(src_addr));
1816 event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
1817 }
1818
1819 if (id_priv->id.event_handler(&id_priv->id, &event)) {
1820 cma_exch(id_priv, CMA_DESTROYING);
1821 mutex_unlock(&id_priv->handler_mutex);
1822 cma_deref_id(id_priv);
1823 rdma_destroy_id(&id_priv->id);
1824 return;
1825 }
1826 out:
1827 mutex_unlock(&id_priv->handler_mutex);
1828 cma_deref_id(id_priv);
1829 }
1830
1831 static int cma_resolve_loopback(struct rdma_id_private *id_priv)
1832 {
1833 struct cma_work *work;
1834 struct sockaddr_in *src_in, *dst_in;
1835 union ib_gid gid;
1836 int ret;
1837
1838 work = kzalloc(sizeof *work, GFP_KERNEL);
1839 if (!work)
1840 return -ENOMEM;
1841
1842 if (!id_priv->cma_dev) {
1843 ret = cma_bind_loopback(id_priv);
1844 if (ret)
1845 goto err;
1846 }
1847
1848 ib_addr_get_sgid(&id_priv->id.route.addr.dev_addr, &gid);
1849 ib_addr_set_dgid(&id_priv->id.route.addr.dev_addr, &gid);
1850
1851 if (cma_zero_addr(&id_priv->id.route.addr.src_addr)) {
1852 src_in = (struct sockaddr_in *)&id_priv->id.route.addr.src_addr;
1853 dst_in = (struct sockaddr_in *)&id_priv->id.route.addr.dst_addr;
1854 src_in->sin_family = dst_in->sin_family;
1855 src_in->sin_addr.s_addr = dst_in->sin_addr.s_addr;
1856 }
1857
1858 work->id = id_priv;
1859 INIT_WORK(&work->work, cma_work_handler);
1860 work->old_state = CMA_ADDR_QUERY;
1861 work->new_state = CMA_ADDR_RESOLVED;
1862 work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
1863 queue_work(cma_wq, &work->work);
1864 return 0;
1865 err:
1866 kfree(work);
1867 return ret;
1868 }
1869
1870 static int cma_bind_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
1871 struct sockaddr *dst_addr)
1872 {
1873 if (src_addr && src_addr->sa_family)
1874 return rdma_bind_addr(id, src_addr);
1875 else
1876 return cma_bind_any(id, dst_addr->sa_family);
1877 }
1878
1879 int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
1880 struct sockaddr *dst_addr, int timeout_ms)
1881 {
1882 struct rdma_id_private *id_priv;
1883 int ret;
1884
1885 id_priv = container_of(id, struct rdma_id_private, id);
1886 if (id_priv->state == CMA_IDLE) {
1887 ret = cma_bind_addr(id, src_addr, dst_addr);
1888 if (ret)
1889 return ret;
1890 }
1891
1892 if (!cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_ADDR_QUERY))
1893 return -EINVAL;
1894
1895 atomic_inc(&id_priv->refcount);
1896 memcpy(&id->route.addr.dst_addr, dst_addr, ip_addr_size(dst_addr));
1897 if (cma_any_addr(dst_addr))
1898 ret = cma_resolve_loopback(id_priv);
1899 else
1900 ret = rdma_resolve_ip(&addr_client, &id->route.addr.src_addr,
1901 dst_addr, &id->route.addr.dev_addr,
1902 timeout_ms, addr_handler, id_priv);
1903 if (ret)
1904 goto err;
1905
1906 return 0;
1907 err:
1908 cma_comp_exch(id_priv, CMA_ADDR_QUERY, CMA_ADDR_BOUND);
1909 cma_deref_id(id_priv);
1910 return ret;
1911 }
1912 EXPORT_SYMBOL(rdma_resolve_addr);
1913
1914 static void cma_bind_port(struct rdma_bind_list *bind_list,
1915 struct rdma_id_private *id_priv)
1916 {
1917 struct sockaddr_in *sin;
1918
1919 sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
1920 sin->sin_port = htons(bind_list->port);
1921 id_priv->bind_list = bind_list;
1922 hlist_add_head(&id_priv->node, &bind_list->owners);
1923 }
1924
1925 static int cma_alloc_port(struct idr *ps, struct rdma_id_private *id_priv,
1926 unsigned short snum)
1927 {
1928 struct rdma_bind_list *bind_list;
1929 int port, ret;
1930
1931 bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL);
1932 if (!bind_list)
1933 return -ENOMEM;
1934
1935 do {
1936 ret = idr_get_new_above(ps, bind_list, snum, &port);
1937 } while ((ret == -EAGAIN) && idr_pre_get(ps, GFP_KERNEL));
1938
1939 if (ret)
1940 goto err1;
1941
1942 if (port != snum) {
1943 ret = -EADDRNOTAVAIL;
1944 goto err2;
1945 }
1946
1947 bind_list->ps = ps;
1948 bind_list->port = (unsigned short) port;
1949 cma_bind_port(bind_list, id_priv);
1950 return 0;
1951 err2:
1952 idr_remove(ps, port);
1953 err1:
1954 kfree(bind_list);
1955 return ret;
1956 }
1957
1958 static int cma_alloc_any_port(struct idr *ps, struct rdma_id_private *id_priv)
1959 {
1960 struct rdma_bind_list *bind_list;
1961 int port, ret, low, high;
1962
1963 bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL);
1964 if (!bind_list)
1965 return -ENOMEM;
1966
1967 retry:
1968 /* FIXME: add proper port randomization per like inet_csk_get_port */
1969 do {
1970 ret = idr_get_new_above(ps, bind_list, next_port, &port);
1971 } while ((ret == -EAGAIN) && idr_pre_get(ps, GFP_KERNEL));
1972
1973 if (ret)
1974 goto err1;
1975
1976 inet_get_local_port_range(&low, &high);
1977 if (port > high) {
1978 if (next_port != low) {
1979 idr_remove(ps, port);
1980 next_port = low;
1981 goto retry;
1982 }
1983 ret = -EADDRNOTAVAIL;
1984 goto err2;
1985 }
1986
1987 if (port == high)
1988 next_port = low;
1989 else
1990 next_port = port + 1;
1991
1992 bind_list->ps = ps;
1993 bind_list->port = (unsigned short) port;
1994 cma_bind_port(bind_list, id_priv);
1995 return 0;
1996 err2:
1997 idr_remove(ps, port);
1998 err1:
1999 kfree(bind_list);
2000 return ret;
2001 }
2002
2003 static int cma_use_port(struct idr *ps, struct rdma_id_private *id_priv)
2004 {
2005 struct rdma_id_private *cur_id;
2006 struct sockaddr_in *sin, *cur_sin;
2007 struct rdma_bind_list *bind_list;
2008 struct hlist_node *node;
2009 unsigned short snum;
2010
2011 sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
2012 snum = ntohs(sin->sin_port);
2013 if (snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
2014 return -EACCES;
2015
2016 bind_list = idr_find(ps, snum);
2017 if (!bind_list)
2018 return cma_alloc_port(ps, id_priv, snum);
2019
2020 /*
2021 * We don't support binding to any address if anyone is bound to
2022 * a specific address on the same port.
2023 */
2024 if (cma_any_addr(&id_priv->id.route.addr.src_addr))
2025 return -EADDRNOTAVAIL;
2026
2027 hlist_for_each_entry(cur_id, node, &bind_list->owners, node) {
2028 if (cma_any_addr(&cur_id->id.route.addr.src_addr))
2029 return -EADDRNOTAVAIL;
2030
2031 cur_sin = (struct sockaddr_in *) &cur_id->id.route.addr.src_addr;
2032 if (sin->sin_addr.s_addr == cur_sin->sin_addr.s_addr)
2033 return -EADDRINUSE;
2034 }
2035
2036 cma_bind_port(bind_list, id_priv);
2037 return 0;
2038 }
2039
2040 static int cma_get_port(struct rdma_id_private *id_priv)
2041 {
2042 struct idr *ps;
2043 int ret;
2044
2045 switch (id_priv->id.ps) {
2046 case RDMA_PS_SDP:
2047 ps = &sdp_ps;
2048 break;
2049 case RDMA_PS_TCP:
2050 ps = &tcp_ps;
2051 break;
2052 case RDMA_PS_UDP:
2053 ps = &udp_ps;
2054 break;
2055 case RDMA_PS_IPOIB:
2056 ps = &ipoib_ps;
2057 break;
2058 default:
2059 return -EPROTONOSUPPORT;
2060 }
2061
2062 mutex_lock(&lock);
2063 if (cma_any_port(&id_priv->id.route.addr.src_addr))
2064 ret = cma_alloc_any_port(ps, id_priv);
2065 else
2066 ret = cma_use_port(ps, id_priv);
2067 mutex_unlock(&lock);
2068
2069 return ret;
2070 }
2071
2072 int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr)
2073 {
2074 struct rdma_id_private *id_priv;
2075 int ret;
2076
2077 if (addr->sa_family != AF_INET)
2078 return -EAFNOSUPPORT;
2079
2080 id_priv = container_of(id, struct rdma_id_private, id);
2081 if (!cma_comp_exch(id_priv, CMA_IDLE, CMA_ADDR_BOUND))
2082 return -EINVAL;
2083
2084 if (!cma_any_addr(addr)) {
2085 ret = rdma_translate_ip(addr, &id->route.addr.dev_addr);
2086 if (ret)
2087 goto err1;
2088
2089 mutex_lock(&lock);
2090 ret = cma_acquire_dev(id_priv);
2091 mutex_unlock(&lock);
2092 if (ret)
2093 goto err1;
2094 }
2095
2096 memcpy(&id->route.addr.src_addr, addr, ip_addr_size(addr));
2097 ret = cma_get_port(id_priv);
2098 if (ret)
2099 goto err2;
2100
2101 return 0;
2102 err2:
2103 if (!cma_any_addr(addr)) {
2104 mutex_lock(&lock);
2105 cma_detach_from_dev(id_priv);
2106 mutex_unlock(&lock);
2107 }
2108 err1:
2109 cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_IDLE);
2110 return ret;
2111 }
2112 EXPORT_SYMBOL(rdma_bind_addr);
2113
2114 static int cma_format_hdr(void *hdr, enum rdma_port_space ps,
2115 struct rdma_route *route)
2116 {
2117 struct sockaddr_in *src4, *dst4;
2118 struct cma_hdr *cma_hdr;
2119 struct sdp_hh *sdp_hdr;
2120
2121 src4 = (struct sockaddr_in *) &route->addr.src_addr;
2122 dst4 = (struct sockaddr_in *) &route->addr.dst_addr;
2123
2124 switch (ps) {
2125 case RDMA_PS_SDP:
2126 sdp_hdr = hdr;
2127 if (sdp_get_majv(sdp_hdr->sdp_version) != SDP_MAJ_VERSION)
2128 return -EINVAL;
2129 sdp_set_ip_ver(sdp_hdr, 4);
2130 sdp_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
2131 sdp_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
2132 sdp_hdr->port = src4->sin_port;
2133 break;
2134 default:
2135 cma_hdr = hdr;
2136 cma_hdr->cma_version = CMA_VERSION;
2137 cma_set_ip_ver(cma_hdr, 4);
2138 cma_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
2139 cma_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
2140 cma_hdr->port = src4->sin_port;
2141 break;
2142 }
2143 return 0;
2144 }
2145
2146 static int cma_sidr_rep_handler(struct ib_cm_id *cm_id,
2147 struct ib_cm_event *ib_event)
2148 {
2149 struct rdma_id_private *id_priv = cm_id->context;
2150 struct rdma_cm_event event;
2151 struct ib_cm_sidr_rep_event_param *rep = &ib_event->param.sidr_rep_rcvd;
2152 int ret = 0;
2153
2154 if (cma_disable_callback(id_priv, CMA_CONNECT))
2155 return 0;
2156
2157 memset(&event, 0, sizeof event);
2158 switch (ib_event->event) {
2159 case IB_CM_SIDR_REQ_ERROR:
2160 event.event = RDMA_CM_EVENT_UNREACHABLE;
2161 event.status = -ETIMEDOUT;
2162 break;
2163 case IB_CM_SIDR_REP_RECEIVED:
2164 event.param.ud.private_data = ib_event->private_data;
2165 event.param.ud.private_data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
2166 if (rep->status != IB_SIDR_SUCCESS) {
2167 event.event = RDMA_CM_EVENT_UNREACHABLE;
2168 event.status = ib_event->param.sidr_rep_rcvd.status;
2169 break;
2170 }
2171 if (id_priv->qkey != rep->qkey) {
2172 event.event = RDMA_CM_EVENT_UNREACHABLE;
2173 event.status = -EINVAL;
2174 break;
2175 }
2176 ib_init_ah_from_path(id_priv->id.device, id_priv->id.port_num,
2177 id_priv->id.route.path_rec,
2178 &event.param.ud.ah_attr);
2179 event.param.ud.qp_num = rep->qpn;
2180 event.param.ud.qkey = rep->qkey;
2181 event.event = RDMA_CM_EVENT_ESTABLISHED;
2182 event.status = 0;
2183 break;
2184 default:
2185 printk(KERN_ERR "RDMA CMA: unexpected IB CM event: %d\n",
2186 ib_event->event);
2187 goto out;
2188 }
2189
2190 ret = id_priv->id.event_handler(&id_priv->id, &event);
2191 if (ret) {
2192 /* Destroy the CM ID by returning a non-zero value. */
2193 id_priv->cm_id.ib = NULL;
2194 cma_exch(id_priv, CMA_DESTROYING);
2195 mutex_unlock(&id_priv->handler_mutex);
2196 rdma_destroy_id(&id_priv->id);
2197 return ret;
2198 }
2199 out:
2200 mutex_unlock(&id_priv->handler_mutex);
2201 return ret;
2202 }
2203
2204 static int cma_resolve_ib_udp(struct rdma_id_private *id_priv,
2205 struct rdma_conn_param *conn_param)
2206 {
2207 struct ib_cm_sidr_req_param req;
2208 struct rdma_route *route;
2209 int ret;
2210
2211 req.private_data_len = sizeof(struct cma_hdr) +
2212 conn_param->private_data_len;
2213 req.private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
2214 if (!req.private_data)
2215 return -ENOMEM;
2216
2217 if (conn_param->private_data && conn_param->private_data_len)
2218 memcpy((void *) req.private_data + sizeof(struct cma_hdr),
2219 conn_param->private_data, conn_param->private_data_len);
2220
2221 route = &id_priv->id.route;
2222 ret = cma_format_hdr((void *) req.private_data, id_priv->id.ps, route);
2223 if (ret)
2224 goto out;
2225
2226 id_priv->cm_id.ib = ib_create_cm_id(id_priv->id.device,
2227 cma_sidr_rep_handler, id_priv);
2228 if (IS_ERR(id_priv->cm_id.ib)) {
2229 ret = PTR_ERR(id_priv->cm_id.ib);
2230 goto out;
2231 }
2232
2233 req.path = route->path_rec;
2234 req.service_id = cma_get_service_id(id_priv->id.ps,
2235 &route->addr.dst_addr);
2236 req.timeout_ms = 1 << (CMA_CM_RESPONSE_TIMEOUT - 8);
2237 req.max_cm_retries = CMA_MAX_CM_RETRIES;
2238
2239 ret = ib_send_cm_sidr_req(id_priv->cm_id.ib, &req);
2240 if (ret) {
2241 ib_destroy_cm_id(id_priv->cm_id.ib);
2242 id_priv->cm_id.ib = NULL;
2243 }
2244 out:
2245 kfree(req.private_data);
2246 return ret;
2247 }
2248
2249 static int cma_connect_ib(struct rdma_id_private *id_priv,
2250 struct rdma_conn_param *conn_param)
2251 {
2252 struct ib_cm_req_param req;
2253 struct rdma_route *route;
2254 void *private_data;
2255 int offset, ret;
2256
2257 memset(&req, 0, sizeof req);
2258 offset = cma_user_data_offset(id_priv->id.ps);
2259 req.private_data_len = offset + conn_param->private_data_len;
2260 private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
2261 if (!private_data)
2262 return -ENOMEM;
2263
2264 if (conn_param->private_data && conn_param->private_data_len)
2265 memcpy(private_data + offset, conn_param->private_data,
2266 conn_param->private_data_len);
2267
2268 id_priv->cm_id.ib = ib_create_cm_id(id_priv->id.device, cma_ib_handler,
2269 id_priv);
2270 if (IS_ERR(id_priv->cm_id.ib)) {
2271 ret = PTR_ERR(id_priv->cm_id.ib);
2272 goto out;
2273 }
2274
2275 route = &id_priv->id.route;
2276 ret = cma_format_hdr(private_data, id_priv->id.ps, route);
2277 if (ret)
2278 goto out;
2279 req.private_data = private_data;
2280
2281 req.primary_path = &route->path_rec[0];
2282 if (route->num_paths == 2)
2283 req.alternate_path = &route->path_rec[1];
2284
2285 req.service_id = cma_get_service_id(id_priv->id.ps,
2286 &route->addr.dst_addr);
2287 req.qp_num = id_priv->qp_num;
2288 req.qp_type = IB_QPT_RC;
2289 req.starting_psn = id_priv->seq_num;
2290 req.responder_resources = conn_param->responder_resources;
2291 req.initiator_depth = conn_param->initiator_depth;
2292 req.flow_control = conn_param->flow_control;
2293 req.retry_count = conn_param->retry_count;
2294 req.rnr_retry_count = conn_param->rnr_retry_count;
2295 req.remote_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
2296 req.local_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
2297 req.max_cm_retries = CMA_MAX_CM_RETRIES;
2298 req.srq = id_priv->srq ? 1 : 0;
2299
2300 ret = ib_send_cm_req(id_priv->cm_id.ib, &req);
2301 out:
2302 if (ret && !IS_ERR(id_priv->cm_id.ib)) {
2303 ib_destroy_cm_id(id_priv->cm_id.ib);
2304 id_priv->cm_id.ib = NULL;
2305 }
2306
2307 kfree(private_data);
2308 return ret;
2309 }
2310
2311 static int cma_connect_iw(struct rdma_id_private *id_priv,
2312 struct rdma_conn_param *conn_param)
2313 {
2314 struct iw_cm_id *cm_id;
2315 struct sockaddr_in* sin;
2316 int ret;
2317 struct iw_cm_conn_param iw_param;
2318
2319 cm_id = iw_create_cm_id(id_priv->id.device, cma_iw_handler, id_priv);
2320 if (IS_ERR(cm_id)) {
2321 ret = PTR_ERR(cm_id);
2322 goto out;
2323 }
2324
2325 id_priv->cm_id.iw = cm_id;
2326
2327 sin = (struct sockaddr_in*) &id_priv->id.route.addr.src_addr;
2328 cm_id->local_addr = *sin;
2329
2330 sin = (struct sockaddr_in*) &id_priv->id.route.addr.dst_addr;
2331 cm_id->remote_addr = *sin;
2332
2333 ret = cma_modify_qp_rtr(id_priv, conn_param);
2334 if (ret)
2335 goto out;
2336
2337 iw_param.ord = conn_param->initiator_depth;
2338 iw_param.ird = conn_param->responder_resources;
2339 iw_param.private_data = conn_param->private_data;
2340 iw_param.private_data_len = conn_param->private_data_len;
2341 if (id_priv->id.qp)
2342 iw_param.qpn = id_priv->qp_num;
2343 else
2344 iw_param.qpn = conn_param->qp_num;
2345 ret = iw_cm_connect(cm_id, &iw_param);
2346 out:
2347 if (ret && !IS_ERR(cm_id)) {
2348 iw_destroy_cm_id(cm_id);
2349 id_priv->cm_id.iw = NULL;
2350 }
2351 return ret;
2352 }
2353
2354 int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
2355 {
2356 struct rdma_id_private *id_priv;
2357 int ret;
2358
2359 id_priv = container_of(id, struct rdma_id_private, id);
2360 if (!cma_comp_exch(id_priv, CMA_ROUTE_RESOLVED, CMA_CONNECT))
2361 return -EINVAL;
2362
2363 if (!id->qp) {
2364 id_priv->qp_num = conn_param->qp_num;
2365 id_priv->srq = conn_param->srq;
2366 }
2367
2368 switch (rdma_node_get_transport(id->device->node_type)) {
2369 case RDMA_TRANSPORT_IB:
2370 if (cma_is_ud_ps(id->ps))
2371 ret = cma_resolve_ib_udp(id_priv, conn_param);
2372 else
2373 ret = cma_connect_ib(id_priv, conn_param);
2374 break;
2375 case RDMA_TRANSPORT_IWARP:
2376 ret = cma_connect_iw(id_priv, conn_param);
2377 break;
2378 default:
2379 ret = -ENOSYS;
2380 break;
2381 }
2382 if (ret)
2383 goto err;
2384
2385 return 0;
2386 err:
2387 cma_comp_exch(id_priv, CMA_CONNECT, CMA_ROUTE_RESOLVED);
2388 return ret;
2389 }
2390 EXPORT_SYMBOL(rdma_connect);
2391
2392 static int cma_accept_ib(struct rdma_id_private *id_priv,
2393 struct rdma_conn_param *conn_param)
2394 {
2395 struct ib_cm_rep_param rep;
2396 int ret;
2397
2398 ret = cma_modify_qp_rtr(id_priv, conn_param);
2399 if (ret)
2400 goto out;
2401
2402 ret = cma_modify_qp_rts(id_priv, conn_param);
2403 if (ret)
2404 goto out;
2405
2406 memset(&rep, 0, sizeof rep);
2407 rep.qp_num = id_priv->qp_num;
2408 rep.starting_psn = id_priv->seq_num;
2409 rep.private_data = conn_param->private_data;
2410 rep.private_data_len = conn_param->private_data_len;
2411 rep.responder_resources = conn_param->responder_resources;
2412 rep.initiator_depth = conn_param->initiator_depth;
2413 rep.failover_accepted = 0;
2414 rep.flow_control = conn_param->flow_control;
2415 rep.rnr_retry_count = conn_param->rnr_retry_count;
2416 rep.srq = id_priv->srq ? 1 : 0;
2417
2418 ret = ib_send_cm_rep(id_priv->cm_id.ib, &rep);
2419 out:
2420 return ret;
2421 }
2422
2423 static int cma_accept_iw(struct rdma_id_private *id_priv,
2424 struct rdma_conn_param *conn_param)
2425 {
2426 struct iw_cm_conn_param iw_param;
2427 int ret;
2428
2429 ret = cma_modify_qp_rtr(id_priv, conn_param);
2430 if (ret)
2431 return ret;
2432
2433 iw_param.ord = conn_param->initiator_depth;
2434 iw_param.ird = conn_param->responder_resources;
2435 iw_param.private_data = conn_param->private_data;
2436 iw_param.private_data_len = conn_param->private_data_len;
2437 if (id_priv->id.qp) {
2438 iw_param.qpn = id_priv->qp_num;
2439 } else
2440 iw_param.qpn = conn_param->qp_num;
2441
2442 return iw_cm_accept(id_priv->cm_id.iw, &iw_param);
2443 }
2444
2445 static int cma_send_sidr_rep(struct rdma_id_private *id_priv,
2446 enum ib_cm_sidr_status status,
2447 const void *private_data, int private_data_len)
2448 {
2449 struct ib_cm_sidr_rep_param rep;
2450
2451 memset(&rep, 0, sizeof rep);
2452 rep.status = status;
2453 if (status == IB_SIDR_SUCCESS) {
2454 rep.qp_num = id_priv->qp_num;
2455 rep.qkey = id_priv->qkey;
2456 }
2457 rep.private_data = private_data;
2458 rep.private_data_len = private_data_len;
2459
2460 return ib_send_cm_sidr_rep(id_priv->cm_id.ib, &rep);
2461 }
2462
2463 int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
2464 {
2465 struct rdma_id_private *id_priv;
2466 int ret;
2467
2468 id_priv = container_of(id, struct rdma_id_private, id);
2469 if (!cma_comp(id_priv, CMA_CONNECT))
2470 return -EINVAL;
2471
2472 if (!id->qp && conn_param) {
2473 id_priv->qp_num = conn_param->qp_num;
2474 id_priv->srq = conn_param->srq;
2475 }
2476
2477 switch (rdma_node_get_transport(id->device->node_type)) {
2478 case RDMA_TRANSPORT_IB:
2479 if (cma_is_ud_ps(id->ps))
2480 ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
2481 conn_param->private_data,
2482 conn_param->private_data_len);
2483 else if (conn_param)
2484 ret = cma_accept_ib(id_priv, conn_param);
2485 else
2486 ret = cma_rep_recv(id_priv);
2487 break;
2488 case RDMA_TRANSPORT_IWARP:
2489 ret = cma_accept_iw(id_priv, conn_param);
2490 break;
2491 default:
2492 ret = -ENOSYS;
2493 break;
2494 }
2495
2496 if (ret)
2497 goto reject;
2498
2499 return 0;
2500 reject:
2501 cma_modify_qp_err(id_priv);
2502 rdma_reject(id, NULL, 0);
2503 return ret;
2504 }
2505 EXPORT_SYMBOL(rdma_accept);
2506
2507 int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event)
2508 {
2509 struct rdma_id_private *id_priv;
2510 int ret;
2511
2512 id_priv = container_of(id, struct rdma_id_private, id);
2513 if (!cma_has_cm_dev(id_priv))
2514 return -EINVAL;
2515
2516 switch (id->device->node_type) {
2517 case RDMA_NODE_IB_CA:
2518 ret = ib_cm_notify(id_priv->cm_id.ib, event);
2519 break;
2520 default:
2521 ret = 0;
2522 break;
2523 }
2524 return ret;
2525 }
2526 EXPORT_SYMBOL(rdma_notify);
2527
2528 int rdma_reject(struct rdma_cm_id *id, const void *private_data,
2529 u8 private_data_len)
2530 {
2531 struct rdma_id_private *id_priv;
2532 int ret;
2533
2534 id_priv = container_of(id, struct rdma_id_private, id);
2535 if (!cma_has_cm_dev(id_priv))
2536 return -EINVAL;
2537
2538 switch (rdma_node_get_transport(id->device->node_type)) {
2539 case RDMA_TRANSPORT_IB:
2540 if (cma_is_ud_ps(id->ps))
2541 ret = cma_send_sidr_rep(id_priv, IB_SIDR_REJECT,
2542 private_data, private_data_len);
2543 else
2544 ret = ib_send_cm_rej(id_priv->cm_id.ib,
2545 IB_CM_REJ_CONSUMER_DEFINED, NULL,
2546 0, private_data, private_data_len);
2547 break;
2548 case RDMA_TRANSPORT_IWARP:
2549 ret = iw_cm_reject(id_priv->cm_id.iw,
2550 private_data, private_data_len);
2551 break;
2552 default:
2553 ret = -ENOSYS;
2554 break;
2555 }
2556 return ret;
2557 }
2558 EXPORT_SYMBOL(rdma_reject);
2559
2560 int rdma_disconnect(struct rdma_cm_id *id)
2561 {
2562 struct rdma_id_private *id_priv;
2563 int ret;
2564
2565 id_priv = container_of(id, struct rdma_id_private, id);
2566 if (!cma_has_cm_dev(id_priv))
2567 return -EINVAL;
2568
2569 switch (rdma_node_get_transport(id->device->node_type)) {
2570 case RDMA_TRANSPORT_IB:
2571 ret = cma_modify_qp_err(id_priv);
2572 if (ret)
2573 goto out;
2574 /* Initiate or respond to a disconnect. */
2575 if (ib_send_cm_dreq(id_priv->cm_id.ib, NULL, 0))
2576 ib_send_cm_drep(id_priv->cm_id.ib, NULL, 0);
2577 break;
2578 case RDMA_TRANSPORT_IWARP:
2579 ret = iw_cm_disconnect(id_priv->cm_id.iw, 0);
2580 break;
2581 default:
2582 ret = -EINVAL;
2583 break;
2584 }
2585 out:
2586 return ret;
2587 }
2588 EXPORT_SYMBOL(rdma_disconnect);
2589
2590 static int cma_ib_mc_handler(int status, struct ib_sa_multicast *multicast)
2591 {
2592 struct rdma_id_private *id_priv;
2593 struct cma_multicast *mc = multicast->context;
2594 struct rdma_cm_event event;
2595 int ret;
2596
2597 id_priv = mc->id_priv;
2598 if (cma_disable_callback(id_priv, CMA_ADDR_BOUND) &&
2599 cma_disable_callback(id_priv, CMA_ADDR_RESOLVED))
2600 return 0;
2601
2602 mutex_lock(&id_priv->qp_mutex);
2603 if (!status && id_priv->id.qp)
2604 status = ib_attach_mcast(id_priv->id.qp, &multicast->rec.mgid,
2605 multicast->rec.mlid);
2606 mutex_unlock(&id_priv->qp_mutex);
2607
2608 memset(&event, 0, sizeof event);
2609 event.status = status;
2610 event.param.ud.private_data = mc->context;
2611 if (!status) {
2612 event.event = RDMA_CM_EVENT_MULTICAST_JOIN;
2613 ib_init_ah_from_mcmember(id_priv->id.device,
2614 id_priv->id.port_num, &multicast->rec,
2615 &event.param.ud.ah_attr);
2616 event.param.ud.qp_num = 0xFFFFFF;
2617 event.param.ud.qkey = be32_to_cpu(multicast->rec.qkey);
2618 } else
2619 event.event = RDMA_CM_EVENT_MULTICAST_ERROR;
2620
2621 ret = id_priv->id.event_handler(&id_priv->id, &event);
2622 if (ret) {
2623 cma_exch(id_priv, CMA_DESTROYING);
2624 mutex_unlock(&id_priv->handler_mutex);
2625 rdma_destroy_id(&id_priv->id);
2626 return 0;
2627 }
2628
2629 mutex_unlock(&id_priv->handler_mutex);
2630 return 0;
2631 }
2632
2633 static void cma_set_mgid(struct rdma_id_private *id_priv,
2634 struct sockaddr *addr, union ib_gid *mgid)
2635 {
2636 unsigned char mc_map[MAX_ADDR_LEN];
2637 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
2638 struct sockaddr_in *sin = (struct sockaddr_in *) addr;
2639 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) addr;
2640
2641 if (cma_any_addr(addr)) {
2642 memset(mgid, 0, sizeof *mgid);
2643 } else if ((addr->sa_family == AF_INET6) &&
2644 ((be32_to_cpu(sin6->sin6_addr.s6_addr32[0]) & 0xFF10A01B) ==
2645 0xFF10A01B)) {
2646 /* IPv6 address is an SA assigned MGID. */
2647 memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
2648 } else {
2649 ip_ib_mc_map(sin->sin_addr.s_addr, dev_addr->broadcast, mc_map);
2650 if (id_priv->id.ps == RDMA_PS_UDP)
2651 mc_map[7] = 0x01; /* Use RDMA CM signature */
2652 *mgid = *(union ib_gid *) (mc_map + 4);
2653 }
2654 }
2655
2656 static int cma_join_ib_multicast(struct rdma_id_private *id_priv,
2657 struct cma_multicast *mc)
2658 {
2659 struct ib_sa_mcmember_rec rec;
2660 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
2661 ib_sa_comp_mask comp_mask;
2662 int ret;
2663
2664 ib_addr_get_mgid(dev_addr, &rec.mgid);
2665 ret = ib_sa_get_mcmember_rec(id_priv->id.device, id_priv->id.port_num,
2666 &rec.mgid, &rec);
2667 if (ret)
2668 return ret;
2669
2670 cma_set_mgid(id_priv, &mc->addr, &rec.mgid);
2671 if (id_priv->id.ps == RDMA_PS_UDP)
2672 rec.qkey = cpu_to_be32(RDMA_UDP_QKEY);
2673 ib_addr_get_sgid(dev_addr, &rec.port_gid);
2674 rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
2675 rec.join_state = 1;
2676
2677 comp_mask = IB_SA_MCMEMBER_REC_MGID | IB_SA_MCMEMBER_REC_PORT_GID |
2678 IB_SA_MCMEMBER_REC_PKEY | IB_SA_MCMEMBER_REC_JOIN_STATE |
2679 IB_SA_MCMEMBER_REC_QKEY | IB_SA_MCMEMBER_REC_SL |
2680 IB_SA_MCMEMBER_REC_FLOW_LABEL |
2681 IB_SA_MCMEMBER_REC_TRAFFIC_CLASS;
2682
2683 mc->multicast.ib = ib_sa_join_multicast(&sa_client, id_priv->id.device,
2684 id_priv->id.port_num, &rec,
2685 comp_mask, GFP_KERNEL,
2686 cma_ib_mc_handler, mc);
2687 if (IS_ERR(mc->multicast.ib))
2688 return PTR_ERR(mc->multicast.ib);
2689
2690 return 0;
2691 }
2692
2693 int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
2694 void *context)
2695 {
2696 struct rdma_id_private *id_priv;
2697 struct cma_multicast *mc;
2698 int ret;
2699
2700 id_priv = container_of(id, struct rdma_id_private, id);
2701 if (!cma_comp(id_priv, CMA_ADDR_BOUND) &&
2702 !cma_comp(id_priv, CMA_ADDR_RESOLVED))
2703 return -EINVAL;
2704
2705 mc = kmalloc(sizeof *mc, GFP_KERNEL);
2706 if (!mc)
2707 return -ENOMEM;
2708
2709 memcpy(&mc->addr, addr, ip_addr_size(addr));
2710 mc->context = context;
2711 mc->id_priv = id_priv;
2712
2713 spin_lock(&id_priv->lock);
2714 list_add(&mc->list, &id_priv->mc_list);
2715 spin_unlock(&id_priv->lock);
2716
2717 switch (rdma_node_get_transport(id->device->node_type)) {
2718 case RDMA_TRANSPORT_IB:
2719 ret = cma_join_ib_multicast(id_priv, mc);
2720 break;
2721 default:
2722 ret = -ENOSYS;
2723 break;
2724 }
2725
2726 if (ret) {
2727 spin_lock_irq(&id_priv->lock);
2728 list_del(&mc->list);
2729 spin_unlock_irq(&id_priv->lock);
2730 kfree(mc);
2731 }
2732 return ret;
2733 }
2734 EXPORT_SYMBOL(rdma_join_multicast);
2735
2736 void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr)
2737 {
2738 struct rdma_id_private *id_priv;
2739 struct cma_multicast *mc;
2740
2741 id_priv = container_of(id, struct rdma_id_private, id);
2742 spin_lock_irq(&id_priv->lock);
2743 list_for_each_entry(mc, &id_priv->mc_list, list) {
2744 if (!memcmp(&mc->addr, addr, ip_addr_size(addr))) {
2745 list_del(&mc->list);
2746 spin_unlock_irq(&id_priv->lock);
2747
2748 if (id->qp)
2749 ib_detach_mcast(id->qp,
2750 &mc->multicast.ib->rec.mgid,
2751 mc->multicast.ib->rec.mlid);
2752 ib_sa_free_multicast(mc->multicast.ib);
2753 kfree(mc);
2754 return;
2755 }
2756 }
2757 spin_unlock_irq(&id_priv->lock);
2758 }
2759 EXPORT_SYMBOL(rdma_leave_multicast);
2760
2761 static int cma_netdev_change(struct net_device *ndev, struct rdma_id_private *id_priv)
2762 {
2763 struct rdma_dev_addr *dev_addr;
2764 struct cma_ndev_work *work;
2765
2766 dev_addr = &id_priv->id.route.addr.dev_addr;
2767
2768 if ((dev_addr->src_dev == ndev) &&
2769 memcmp(dev_addr->src_dev_addr, ndev->dev_addr, ndev->addr_len)) {
2770 printk(KERN_INFO "RDMA CM addr change for ndev %s used by id %p\n",
2771 ndev->name, &id_priv->id);
2772 work = kzalloc(sizeof *work, GFP_KERNEL);
2773 if (!work)
2774 return -ENOMEM;
2775
2776 INIT_WORK(&work->work, cma_ndev_work_handler);
2777 work->id = id_priv;
2778 work->event.event = RDMA_CM_EVENT_ADDR_CHANGE;
2779 atomic_inc(&id_priv->refcount);
2780 queue_work(cma_wq, &work->work);
2781 }
2782
2783 return 0;
2784 }
2785
2786 static int cma_netdev_callback(struct notifier_block *self, unsigned long event,
2787 void *ctx)
2788 {
2789 struct net_device *ndev = (struct net_device *)ctx;
2790 struct cma_device *cma_dev;
2791 struct rdma_id_private *id_priv;
2792 int ret = NOTIFY_DONE;
2793
2794 if (dev_net(ndev) != &init_net)
2795 return NOTIFY_DONE;
2796
2797 if (event != NETDEV_BONDING_FAILOVER)
2798 return NOTIFY_DONE;
2799
2800 if (!(ndev->flags & IFF_MASTER) || !(ndev->priv_flags & IFF_BONDING))
2801 return NOTIFY_DONE;
2802
2803 mutex_lock(&lock);
2804 list_for_each_entry(cma_dev, &dev_list, list)
2805 list_for_each_entry(id_priv, &cma_dev->id_list, list) {
2806 ret = cma_netdev_change(ndev, id_priv);
2807 if (ret)
2808 goto out;
2809 }
2810
2811 out:
2812 mutex_unlock(&lock);
2813 return ret;
2814 }
2815
2816 static struct notifier_block cma_nb = {
2817 .notifier_call = cma_netdev_callback
2818 };
2819
2820 static void cma_add_one(struct ib_device *device)
2821 {
2822 struct cma_device *cma_dev;
2823 struct rdma_id_private *id_priv;
2824
2825 cma_dev = kmalloc(sizeof *cma_dev, GFP_KERNEL);
2826 if (!cma_dev)
2827 return;
2828
2829 cma_dev->device = device;
2830
2831 init_completion(&cma_dev->comp);
2832 atomic_set(&cma_dev->refcount, 1);
2833 INIT_LIST_HEAD(&cma_dev->id_list);
2834 ib_set_client_data(device, &cma_client, cma_dev);
2835
2836 mutex_lock(&lock);
2837 list_add_tail(&cma_dev->list, &dev_list);
2838 list_for_each_entry(id_priv, &listen_any_list, list)
2839 cma_listen_on_dev(id_priv, cma_dev);
2840 mutex_unlock(&lock);
2841 }
2842
2843 static int cma_remove_id_dev(struct rdma_id_private *id_priv)
2844 {
2845 struct rdma_cm_event event;
2846 enum cma_state state;
2847 int ret = 0;
2848
2849 /* Record that we want to remove the device */
2850 state = cma_exch(id_priv, CMA_DEVICE_REMOVAL);
2851 if (state == CMA_DESTROYING)
2852 return 0;
2853
2854 cma_cancel_operation(id_priv, state);
2855 mutex_lock(&id_priv->handler_mutex);
2856
2857 /* Check for destruction from another callback. */
2858 if (!cma_comp(id_priv, CMA_DEVICE_REMOVAL))
2859 goto out;
2860
2861 memset(&event, 0, sizeof event);
2862 event.event = RDMA_CM_EVENT_DEVICE_REMOVAL;
2863 ret = id_priv->id.event_handler(&id_priv->id, &event);
2864 out:
2865 mutex_unlock(&id_priv->handler_mutex);
2866 return ret;
2867 }
2868
2869 static void cma_process_remove(struct cma_device *cma_dev)
2870 {
2871 struct rdma_id_private *id_priv;
2872 int ret;
2873
2874 mutex_lock(&lock);
2875 while (!list_empty(&cma_dev->id_list)) {
2876 id_priv = list_entry(cma_dev->id_list.next,
2877 struct rdma_id_private, list);
2878
2879 list_del(&id_priv->listen_list);
2880 list_del_init(&id_priv->list);
2881 atomic_inc(&id_priv->refcount);
2882 mutex_unlock(&lock);
2883
2884 ret = id_priv->internal_id ? 1 : cma_remove_id_dev(id_priv);
2885 cma_deref_id(id_priv);
2886 if (ret)
2887 rdma_destroy_id(&id_priv->id);
2888
2889 mutex_lock(&lock);
2890 }
2891 mutex_unlock(&lock);
2892
2893 cma_deref_dev(cma_dev);
2894 wait_for_completion(&cma_dev->comp);
2895 }
2896
2897 static void cma_remove_one(struct ib_device *device)
2898 {
2899 struct cma_device *cma_dev;
2900
2901 cma_dev = ib_get_client_data(device, &cma_client);
2902 if (!cma_dev)
2903 return;
2904
2905 mutex_lock(&lock);
2906 list_del(&cma_dev->list);
2907 mutex_unlock(&lock);
2908
2909 cma_process_remove(cma_dev);
2910 kfree(cma_dev);
2911 }
2912
2913 static int cma_init(void)
2914 {
2915 int ret, low, high, remaining;
2916
2917 get_random_bytes(&next_port, sizeof next_port);
2918 inet_get_local_port_range(&low, &high);
2919 remaining = (high - low) + 1;
2920 next_port = ((unsigned int) next_port % remaining) + low;
2921
2922 cma_wq = create_singlethread_workqueue("rdma_cm");
2923 if (!cma_wq)
2924 return -ENOMEM;
2925
2926 ib_sa_register_client(&sa_client);
2927 rdma_addr_register_client(&addr_client);
2928 register_netdevice_notifier(&cma_nb);
2929
2930 ret = ib_register_client(&cma_client);
2931 if (ret)
2932 goto err;
2933 return 0;
2934
2935 err:
2936 unregister_netdevice_notifier(&cma_nb);
2937 rdma_addr_unregister_client(&addr_client);
2938 ib_sa_unregister_client(&sa_client);
2939 destroy_workqueue(cma_wq);
2940 return ret;
2941 }
2942
2943 static void cma_cleanup(void)
2944 {
2945 ib_unregister_client(&cma_client);
2946 unregister_netdevice_notifier(&cma_nb);
2947 rdma_addr_unregister_client(&addr_client);
2948 ib_sa_unregister_client(&sa_client);
2949 destroy_workqueue(cma_wq);
2950 idr_destroy(&sdp_ps);
2951 idr_destroy(&tcp_ps);
2952 idr_destroy(&udp_ps);
2953 idr_destroy(&ipoib_ps);
2954 }
2955
2956 module_init(cma_init);
2957 module_exit(cma_cleanup);
Support for the Chinese Samsung S3C2440 based development boards