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Merge tag 'trace-v4.5' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux...
[deliverable/linux.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 #include <linux/slab.h>
44 #include <linux/module.h>
45 #include <net/route.h>
46
47 #include <net/net_namespace.h>
48 #include <net/netns/generic.h>
49 #include <net/tcp.h>
50 #include <net/ipv6.h>
51 #include <net/ip_fib.h>
52 #include <net/ip6_route.h>
53
54 #include <rdma/rdma_cm.h>
55 #include <rdma/rdma_cm_ib.h>
56 #include <rdma/rdma_netlink.h>
57 #include <rdma/ib.h>
58 #include <rdma/ib_cache.h>
59 #include <rdma/ib_cm.h>
60 #include <rdma/ib_sa.h>
61 #include <rdma/iw_cm.h>
62
63 MODULE_AUTHOR("Sean Hefty");
64 MODULE_DESCRIPTION("Generic RDMA CM Agent");
65 MODULE_LICENSE("Dual BSD/GPL");
66
67 #define CMA_CM_RESPONSE_TIMEOUT 20
68 #define CMA_MAX_CM_RETRIES 15
69 #define CMA_CM_MRA_SETTING (IB_CM_MRA_FLAG_DELAY | 24)
70 #define CMA_IBOE_PACKET_LIFETIME 18
71
72 static const char * const cma_events[] = {
73 [RDMA_CM_EVENT_ADDR_RESOLVED] = "address resolved",
74 [RDMA_CM_EVENT_ADDR_ERROR] = "address error",
75 [RDMA_CM_EVENT_ROUTE_RESOLVED] = "route resolved ",
76 [RDMA_CM_EVENT_ROUTE_ERROR] = "route error",
77 [RDMA_CM_EVENT_CONNECT_REQUEST] = "connect request",
78 [RDMA_CM_EVENT_CONNECT_RESPONSE] = "connect response",
79 [RDMA_CM_EVENT_CONNECT_ERROR] = "connect error",
80 [RDMA_CM_EVENT_UNREACHABLE] = "unreachable",
81 [RDMA_CM_EVENT_REJECTED] = "rejected",
82 [RDMA_CM_EVENT_ESTABLISHED] = "established",
83 [RDMA_CM_EVENT_DISCONNECTED] = "disconnected",
84 [RDMA_CM_EVENT_DEVICE_REMOVAL] = "device removal",
85 [RDMA_CM_EVENT_MULTICAST_JOIN] = "multicast join",
86 [RDMA_CM_EVENT_MULTICAST_ERROR] = "multicast error",
87 [RDMA_CM_EVENT_ADDR_CHANGE] = "address change",
88 [RDMA_CM_EVENT_TIMEWAIT_EXIT] = "timewait exit",
89 };
90
91 const char *__attribute_const__ rdma_event_msg(enum rdma_cm_event_type event)
92 {
93 size_t index = event;
94
95 return (index < ARRAY_SIZE(cma_events) && cma_events[index]) ?
96 cma_events[index] : "unrecognized event";
97 }
98 EXPORT_SYMBOL(rdma_event_msg);
99
100 static void cma_add_one(struct ib_device *device);
101 static void cma_remove_one(struct ib_device *device, void *client_data);
102
103 static struct ib_client cma_client = {
104 .name = "cma",
105 .add = cma_add_one,
106 .remove = cma_remove_one
107 };
108
109 static struct ib_sa_client sa_client;
110 static struct rdma_addr_client addr_client;
111 static LIST_HEAD(dev_list);
112 static LIST_HEAD(listen_any_list);
113 static DEFINE_MUTEX(lock);
114 static struct workqueue_struct *cma_wq;
115 static int cma_pernet_id;
116
117 struct cma_pernet {
118 struct idr tcp_ps;
119 struct idr udp_ps;
120 struct idr ipoib_ps;
121 struct idr ib_ps;
122 };
123
124 static struct cma_pernet *cma_pernet(struct net *net)
125 {
126 return net_generic(net, cma_pernet_id);
127 }
128
129 static struct idr *cma_pernet_idr(struct net *net, enum rdma_port_space ps)
130 {
131 struct cma_pernet *pernet = cma_pernet(net);
132
133 switch (ps) {
134 case RDMA_PS_TCP:
135 return &pernet->tcp_ps;
136 case RDMA_PS_UDP:
137 return &pernet->udp_ps;
138 case RDMA_PS_IPOIB:
139 return &pernet->ipoib_ps;
140 case RDMA_PS_IB:
141 return &pernet->ib_ps;
142 default:
143 return NULL;
144 }
145 }
146
147 struct cma_device {
148 struct list_head list;
149 struct ib_device *device;
150 struct completion comp;
151 atomic_t refcount;
152 struct list_head id_list;
153 };
154
155 struct rdma_bind_list {
156 enum rdma_port_space ps;
157 struct hlist_head owners;
158 unsigned short port;
159 };
160
161 static int cma_ps_alloc(struct net *net, enum rdma_port_space ps,
162 struct rdma_bind_list *bind_list, int snum)
163 {
164 struct idr *idr = cma_pernet_idr(net, ps);
165
166 return idr_alloc(idr, bind_list, snum, snum + 1, GFP_KERNEL);
167 }
168
169 static struct rdma_bind_list *cma_ps_find(struct net *net,
170 enum rdma_port_space ps, int snum)
171 {
172 struct idr *idr = cma_pernet_idr(net, ps);
173
174 return idr_find(idr, snum);
175 }
176
177 static void cma_ps_remove(struct net *net, enum rdma_port_space ps, int snum)
178 {
179 struct idr *idr = cma_pernet_idr(net, ps);
180
181 idr_remove(idr, snum);
182 }
183
184 enum {
185 CMA_OPTION_AFONLY,
186 };
187
188 /*
189 * Device removal can occur at anytime, so we need extra handling to
190 * serialize notifying the user of device removal with other callbacks.
191 * We do this by disabling removal notification while a callback is in process,
192 * and reporting it after the callback completes.
193 */
194 struct rdma_id_private {
195 struct rdma_cm_id id;
196
197 struct rdma_bind_list *bind_list;
198 struct hlist_node node;
199 struct list_head list; /* listen_any_list or cma_device.list */
200 struct list_head listen_list; /* per device listens */
201 struct cma_device *cma_dev;
202 struct list_head mc_list;
203
204 int internal_id;
205 enum rdma_cm_state state;
206 spinlock_t lock;
207 struct mutex qp_mutex;
208
209 struct completion comp;
210 atomic_t refcount;
211 struct mutex handler_mutex;
212
213 int backlog;
214 int timeout_ms;
215 struct ib_sa_query *query;
216 int query_id;
217 union {
218 struct ib_cm_id *ib;
219 struct iw_cm_id *iw;
220 } cm_id;
221
222 u32 seq_num;
223 u32 qkey;
224 u32 qp_num;
225 pid_t owner;
226 u32 options;
227 u8 srq;
228 u8 tos;
229 u8 reuseaddr;
230 u8 afonly;
231 };
232
233 struct cma_multicast {
234 struct rdma_id_private *id_priv;
235 union {
236 struct ib_sa_multicast *ib;
237 } multicast;
238 struct list_head list;
239 void *context;
240 struct sockaddr_storage addr;
241 struct kref mcref;
242 };
243
244 struct cma_work {
245 struct work_struct work;
246 struct rdma_id_private *id;
247 enum rdma_cm_state old_state;
248 enum rdma_cm_state new_state;
249 struct rdma_cm_event event;
250 };
251
252 struct cma_ndev_work {
253 struct work_struct work;
254 struct rdma_id_private *id;
255 struct rdma_cm_event event;
256 };
257
258 struct iboe_mcast_work {
259 struct work_struct work;
260 struct rdma_id_private *id;
261 struct cma_multicast *mc;
262 };
263
264 union cma_ip_addr {
265 struct in6_addr ip6;
266 struct {
267 __be32 pad[3];
268 __be32 addr;
269 } ip4;
270 };
271
272 struct cma_hdr {
273 u8 cma_version;
274 u8 ip_version; /* IP version: 7:4 */
275 __be16 port;
276 union cma_ip_addr src_addr;
277 union cma_ip_addr dst_addr;
278 };
279
280 #define CMA_VERSION 0x00
281
282 struct cma_req_info {
283 struct ib_device *device;
284 int port;
285 union ib_gid local_gid;
286 __be64 service_id;
287 u16 pkey;
288 bool has_gid:1;
289 };
290
291 static int cma_comp(struct rdma_id_private *id_priv, enum rdma_cm_state comp)
292 {
293 unsigned long flags;
294 int ret;
295
296 spin_lock_irqsave(&id_priv->lock, flags);
297 ret = (id_priv->state == comp);
298 spin_unlock_irqrestore(&id_priv->lock, flags);
299 return ret;
300 }
301
302 static int cma_comp_exch(struct rdma_id_private *id_priv,
303 enum rdma_cm_state comp, enum rdma_cm_state exch)
304 {
305 unsigned long flags;
306 int ret;
307
308 spin_lock_irqsave(&id_priv->lock, flags);
309 if ((ret = (id_priv->state == comp)))
310 id_priv->state = exch;
311 spin_unlock_irqrestore(&id_priv->lock, flags);
312 return ret;
313 }
314
315 static enum rdma_cm_state cma_exch(struct rdma_id_private *id_priv,
316 enum rdma_cm_state exch)
317 {
318 unsigned long flags;
319 enum rdma_cm_state old;
320
321 spin_lock_irqsave(&id_priv->lock, flags);
322 old = id_priv->state;
323 id_priv->state = exch;
324 spin_unlock_irqrestore(&id_priv->lock, flags);
325 return old;
326 }
327
328 static inline u8 cma_get_ip_ver(const struct cma_hdr *hdr)
329 {
330 return hdr->ip_version >> 4;
331 }
332
333 static inline void cma_set_ip_ver(struct cma_hdr *hdr, u8 ip_ver)
334 {
335 hdr->ip_version = (ip_ver << 4) | (hdr->ip_version & 0xF);
336 }
337
338 static void cma_attach_to_dev(struct rdma_id_private *id_priv,
339 struct cma_device *cma_dev)
340 {
341 atomic_inc(&cma_dev->refcount);
342 id_priv->cma_dev = cma_dev;
343 id_priv->id.device = cma_dev->device;
344 id_priv->id.route.addr.dev_addr.transport =
345 rdma_node_get_transport(cma_dev->device->node_type);
346 list_add_tail(&id_priv->list, &cma_dev->id_list);
347 }
348
349 static inline void cma_deref_dev(struct cma_device *cma_dev)
350 {
351 if (atomic_dec_and_test(&cma_dev->refcount))
352 complete(&cma_dev->comp);
353 }
354
355 static inline void release_mc(struct kref *kref)
356 {
357 struct cma_multicast *mc = container_of(kref, struct cma_multicast, mcref);
358
359 kfree(mc->multicast.ib);
360 kfree(mc);
361 }
362
363 static void cma_release_dev(struct rdma_id_private *id_priv)
364 {
365 mutex_lock(&lock);
366 list_del(&id_priv->list);
367 cma_deref_dev(id_priv->cma_dev);
368 id_priv->cma_dev = NULL;
369 mutex_unlock(&lock);
370 }
371
372 static inline struct sockaddr *cma_src_addr(struct rdma_id_private *id_priv)
373 {
374 return (struct sockaddr *) &id_priv->id.route.addr.src_addr;
375 }
376
377 static inline struct sockaddr *cma_dst_addr(struct rdma_id_private *id_priv)
378 {
379 return (struct sockaddr *) &id_priv->id.route.addr.dst_addr;
380 }
381
382 static inline unsigned short cma_family(struct rdma_id_private *id_priv)
383 {
384 return id_priv->id.route.addr.src_addr.ss_family;
385 }
386
387 static int cma_set_qkey(struct rdma_id_private *id_priv, u32 qkey)
388 {
389 struct ib_sa_mcmember_rec rec;
390 int ret = 0;
391
392 if (id_priv->qkey) {
393 if (qkey && id_priv->qkey != qkey)
394 return -EINVAL;
395 return 0;
396 }
397
398 if (qkey) {
399 id_priv->qkey = qkey;
400 return 0;
401 }
402
403 switch (id_priv->id.ps) {
404 case RDMA_PS_UDP:
405 case RDMA_PS_IB:
406 id_priv->qkey = RDMA_UDP_QKEY;
407 break;
408 case RDMA_PS_IPOIB:
409 ib_addr_get_mgid(&id_priv->id.route.addr.dev_addr, &rec.mgid);
410 ret = ib_sa_get_mcmember_rec(id_priv->id.device,
411 id_priv->id.port_num, &rec.mgid,
412 &rec);
413 if (!ret)
414 id_priv->qkey = be32_to_cpu(rec.qkey);
415 break;
416 default:
417 break;
418 }
419 return ret;
420 }
421
422 static void cma_translate_ib(struct sockaddr_ib *sib, struct rdma_dev_addr *dev_addr)
423 {
424 dev_addr->dev_type = ARPHRD_INFINIBAND;
425 rdma_addr_set_sgid(dev_addr, (union ib_gid *) &sib->sib_addr);
426 ib_addr_set_pkey(dev_addr, ntohs(sib->sib_pkey));
427 }
428
429 static int cma_translate_addr(struct sockaddr *addr, struct rdma_dev_addr *dev_addr)
430 {
431 int ret;
432
433 if (addr->sa_family != AF_IB) {
434 ret = rdma_translate_ip(addr, dev_addr, NULL);
435 } else {
436 cma_translate_ib((struct sockaddr_ib *) addr, dev_addr);
437 ret = 0;
438 }
439
440 return ret;
441 }
442
443 static inline int cma_validate_port(struct ib_device *device, u8 port,
444 union ib_gid *gid, int dev_type,
445 int bound_if_index)
446 {
447 int ret = -ENODEV;
448 struct net_device *ndev = NULL;
449
450 if ((dev_type == ARPHRD_INFINIBAND) && !rdma_protocol_ib(device, port))
451 return ret;
452
453 if ((dev_type != ARPHRD_INFINIBAND) && rdma_protocol_ib(device, port))
454 return ret;
455
456 if (dev_type == ARPHRD_ETHER)
457 ndev = dev_get_by_index(&init_net, bound_if_index);
458
459 ret = ib_find_cached_gid_by_port(device, gid, port, ndev, NULL);
460
461 if (ndev)
462 dev_put(ndev);
463
464 return ret;
465 }
466
467 static int cma_acquire_dev(struct rdma_id_private *id_priv,
468 struct rdma_id_private *listen_id_priv)
469 {
470 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
471 struct cma_device *cma_dev;
472 union ib_gid gid, iboe_gid, *gidp;
473 int ret = -ENODEV;
474 u8 port;
475
476 if (dev_addr->dev_type != ARPHRD_INFINIBAND &&
477 id_priv->id.ps == RDMA_PS_IPOIB)
478 return -EINVAL;
479
480 mutex_lock(&lock);
481 rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
482 &iboe_gid);
483
484 memcpy(&gid, dev_addr->src_dev_addr +
485 rdma_addr_gid_offset(dev_addr), sizeof gid);
486
487 if (listen_id_priv) {
488 cma_dev = listen_id_priv->cma_dev;
489 port = listen_id_priv->id.port_num;
490 gidp = rdma_protocol_roce(cma_dev->device, port) ?
491 &iboe_gid : &gid;
492
493 ret = cma_validate_port(cma_dev->device, port, gidp,
494 dev_addr->dev_type,
495 dev_addr->bound_dev_if);
496 if (!ret) {
497 id_priv->id.port_num = port;
498 goto out;
499 }
500 }
501
502 list_for_each_entry(cma_dev, &dev_list, list) {
503 for (port = 1; port <= cma_dev->device->phys_port_cnt; ++port) {
504 if (listen_id_priv &&
505 listen_id_priv->cma_dev == cma_dev &&
506 listen_id_priv->id.port_num == port)
507 continue;
508
509 gidp = rdma_protocol_roce(cma_dev->device, port) ?
510 &iboe_gid : &gid;
511
512 ret = cma_validate_port(cma_dev->device, port, gidp,
513 dev_addr->dev_type,
514 dev_addr->bound_dev_if);
515 if (!ret) {
516 id_priv->id.port_num = port;
517 goto out;
518 }
519 }
520 }
521
522 out:
523 if (!ret)
524 cma_attach_to_dev(id_priv, cma_dev);
525
526 mutex_unlock(&lock);
527 return ret;
528 }
529
530 /*
531 * Select the source IB device and address to reach the destination IB address.
532 */
533 static int cma_resolve_ib_dev(struct rdma_id_private *id_priv)
534 {
535 struct cma_device *cma_dev, *cur_dev;
536 struct sockaddr_ib *addr;
537 union ib_gid gid, sgid, *dgid;
538 u16 pkey, index;
539 u8 p;
540 int i;
541
542 cma_dev = NULL;
543 addr = (struct sockaddr_ib *) cma_dst_addr(id_priv);
544 dgid = (union ib_gid *) &addr->sib_addr;
545 pkey = ntohs(addr->sib_pkey);
546
547 list_for_each_entry(cur_dev, &dev_list, list) {
548 for (p = 1; p <= cur_dev->device->phys_port_cnt; ++p) {
549 if (!rdma_cap_af_ib(cur_dev->device, p))
550 continue;
551
552 if (ib_find_cached_pkey(cur_dev->device, p, pkey, &index))
553 continue;
554
555 for (i = 0; !ib_get_cached_gid(cur_dev->device, p, i,
556 &gid, NULL);
557 i++) {
558 if (!memcmp(&gid, dgid, sizeof(gid))) {
559 cma_dev = cur_dev;
560 sgid = gid;
561 id_priv->id.port_num = p;
562 goto found;
563 }
564
565 if (!cma_dev && (gid.global.subnet_prefix ==
566 dgid->global.subnet_prefix)) {
567 cma_dev = cur_dev;
568 sgid = gid;
569 id_priv->id.port_num = p;
570 }
571 }
572 }
573 }
574
575 if (!cma_dev)
576 return -ENODEV;
577
578 found:
579 cma_attach_to_dev(id_priv, cma_dev);
580 addr = (struct sockaddr_ib *) cma_src_addr(id_priv);
581 memcpy(&addr->sib_addr, &sgid, sizeof sgid);
582 cma_translate_ib(addr, &id_priv->id.route.addr.dev_addr);
583 return 0;
584 }
585
586 static void cma_deref_id(struct rdma_id_private *id_priv)
587 {
588 if (atomic_dec_and_test(&id_priv->refcount))
589 complete(&id_priv->comp);
590 }
591
592 static int cma_disable_callback(struct rdma_id_private *id_priv,
593 enum rdma_cm_state state)
594 {
595 mutex_lock(&id_priv->handler_mutex);
596 if (id_priv->state != state) {
597 mutex_unlock(&id_priv->handler_mutex);
598 return -EINVAL;
599 }
600 return 0;
601 }
602
603 struct rdma_cm_id *rdma_create_id(struct net *net,
604 rdma_cm_event_handler event_handler,
605 void *context, enum rdma_port_space ps,
606 enum ib_qp_type qp_type)
607 {
608 struct rdma_id_private *id_priv;
609
610 id_priv = kzalloc(sizeof *id_priv, GFP_KERNEL);
611 if (!id_priv)
612 return ERR_PTR(-ENOMEM);
613
614 id_priv->owner = task_pid_nr(current);
615 id_priv->state = RDMA_CM_IDLE;
616 id_priv->id.context = context;
617 id_priv->id.event_handler = event_handler;
618 id_priv->id.ps = ps;
619 id_priv->id.qp_type = qp_type;
620 spin_lock_init(&id_priv->lock);
621 mutex_init(&id_priv->qp_mutex);
622 init_completion(&id_priv->comp);
623 atomic_set(&id_priv->refcount, 1);
624 mutex_init(&id_priv->handler_mutex);
625 INIT_LIST_HEAD(&id_priv->listen_list);
626 INIT_LIST_HEAD(&id_priv->mc_list);
627 get_random_bytes(&id_priv->seq_num, sizeof id_priv->seq_num);
628 id_priv->id.route.addr.dev_addr.net = get_net(net);
629
630 return &id_priv->id;
631 }
632 EXPORT_SYMBOL(rdma_create_id);
633
634 static int cma_init_ud_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
635 {
636 struct ib_qp_attr qp_attr;
637 int qp_attr_mask, ret;
638
639 qp_attr.qp_state = IB_QPS_INIT;
640 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
641 if (ret)
642 return ret;
643
644 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
645 if (ret)
646 return ret;
647
648 qp_attr.qp_state = IB_QPS_RTR;
649 ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE);
650 if (ret)
651 return ret;
652
653 qp_attr.qp_state = IB_QPS_RTS;
654 qp_attr.sq_psn = 0;
655 ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE | IB_QP_SQ_PSN);
656
657 return ret;
658 }
659
660 static int cma_init_conn_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
661 {
662 struct ib_qp_attr qp_attr;
663 int qp_attr_mask, ret;
664
665 qp_attr.qp_state = IB_QPS_INIT;
666 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
667 if (ret)
668 return ret;
669
670 return ib_modify_qp(qp, &qp_attr, qp_attr_mask);
671 }
672
673 int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd,
674 struct ib_qp_init_attr *qp_init_attr)
675 {
676 struct rdma_id_private *id_priv;
677 struct ib_qp *qp;
678 int ret;
679
680 id_priv = container_of(id, struct rdma_id_private, id);
681 if (id->device != pd->device)
682 return -EINVAL;
683
684 qp = ib_create_qp(pd, qp_init_attr);
685 if (IS_ERR(qp))
686 return PTR_ERR(qp);
687
688 if (id->qp_type == IB_QPT_UD)
689 ret = cma_init_ud_qp(id_priv, qp);
690 else
691 ret = cma_init_conn_qp(id_priv, qp);
692 if (ret)
693 goto err;
694
695 id->qp = qp;
696 id_priv->qp_num = qp->qp_num;
697 id_priv->srq = (qp->srq != NULL);
698 return 0;
699 err:
700 ib_destroy_qp(qp);
701 return ret;
702 }
703 EXPORT_SYMBOL(rdma_create_qp);
704
705 void rdma_destroy_qp(struct rdma_cm_id *id)
706 {
707 struct rdma_id_private *id_priv;
708
709 id_priv = container_of(id, struct rdma_id_private, id);
710 mutex_lock(&id_priv->qp_mutex);
711 ib_destroy_qp(id_priv->id.qp);
712 id_priv->id.qp = NULL;
713 mutex_unlock(&id_priv->qp_mutex);
714 }
715 EXPORT_SYMBOL(rdma_destroy_qp);
716
717 static int cma_modify_qp_rtr(struct rdma_id_private *id_priv,
718 struct rdma_conn_param *conn_param)
719 {
720 struct ib_qp_attr qp_attr;
721 int qp_attr_mask, ret;
722 union ib_gid sgid;
723
724 mutex_lock(&id_priv->qp_mutex);
725 if (!id_priv->id.qp) {
726 ret = 0;
727 goto out;
728 }
729
730 /* Need to update QP attributes from default values. */
731 qp_attr.qp_state = IB_QPS_INIT;
732 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
733 if (ret)
734 goto out;
735
736 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
737 if (ret)
738 goto out;
739
740 qp_attr.qp_state = IB_QPS_RTR;
741 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
742 if (ret)
743 goto out;
744
745 ret = ib_query_gid(id_priv->id.device, id_priv->id.port_num,
746 qp_attr.ah_attr.grh.sgid_index, &sgid, NULL);
747 if (ret)
748 goto out;
749
750 BUG_ON(id_priv->cma_dev->device != id_priv->id.device);
751
752 if (conn_param)
753 qp_attr.max_dest_rd_atomic = conn_param->responder_resources;
754 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
755 out:
756 mutex_unlock(&id_priv->qp_mutex);
757 return ret;
758 }
759
760 static int cma_modify_qp_rts(struct rdma_id_private *id_priv,
761 struct rdma_conn_param *conn_param)
762 {
763 struct ib_qp_attr qp_attr;
764 int qp_attr_mask, ret;
765
766 mutex_lock(&id_priv->qp_mutex);
767 if (!id_priv->id.qp) {
768 ret = 0;
769 goto out;
770 }
771
772 qp_attr.qp_state = IB_QPS_RTS;
773 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
774 if (ret)
775 goto out;
776
777 if (conn_param)
778 qp_attr.max_rd_atomic = conn_param->initiator_depth;
779 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
780 out:
781 mutex_unlock(&id_priv->qp_mutex);
782 return ret;
783 }
784
785 static int cma_modify_qp_err(struct rdma_id_private *id_priv)
786 {
787 struct ib_qp_attr qp_attr;
788 int ret;
789
790 mutex_lock(&id_priv->qp_mutex);
791 if (!id_priv->id.qp) {
792 ret = 0;
793 goto out;
794 }
795
796 qp_attr.qp_state = IB_QPS_ERR;
797 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, IB_QP_STATE);
798 out:
799 mutex_unlock(&id_priv->qp_mutex);
800 return ret;
801 }
802
803 static int cma_ib_init_qp_attr(struct rdma_id_private *id_priv,
804 struct ib_qp_attr *qp_attr, int *qp_attr_mask)
805 {
806 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
807 int ret;
808 u16 pkey;
809
810 if (rdma_cap_eth_ah(id_priv->id.device, id_priv->id.port_num))
811 pkey = 0xffff;
812 else
813 pkey = ib_addr_get_pkey(dev_addr);
814
815 ret = ib_find_cached_pkey(id_priv->id.device, id_priv->id.port_num,
816 pkey, &qp_attr->pkey_index);
817 if (ret)
818 return ret;
819
820 qp_attr->port_num = id_priv->id.port_num;
821 *qp_attr_mask = IB_QP_STATE | IB_QP_PKEY_INDEX | IB_QP_PORT;
822
823 if (id_priv->id.qp_type == IB_QPT_UD) {
824 ret = cma_set_qkey(id_priv, 0);
825 if (ret)
826 return ret;
827
828 qp_attr->qkey = id_priv->qkey;
829 *qp_attr_mask |= IB_QP_QKEY;
830 } else {
831 qp_attr->qp_access_flags = 0;
832 *qp_attr_mask |= IB_QP_ACCESS_FLAGS;
833 }
834 return 0;
835 }
836
837 int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
838 int *qp_attr_mask)
839 {
840 struct rdma_id_private *id_priv;
841 int ret = 0;
842
843 id_priv = container_of(id, struct rdma_id_private, id);
844 if (rdma_cap_ib_cm(id->device, id->port_num)) {
845 if (!id_priv->cm_id.ib || (id_priv->id.qp_type == IB_QPT_UD))
846 ret = cma_ib_init_qp_attr(id_priv, qp_attr, qp_attr_mask);
847 else
848 ret = ib_cm_init_qp_attr(id_priv->cm_id.ib, qp_attr,
849 qp_attr_mask);
850
851 if (qp_attr->qp_state == IB_QPS_RTR)
852 qp_attr->rq_psn = id_priv->seq_num;
853 } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
854 if (!id_priv->cm_id.iw) {
855 qp_attr->qp_access_flags = 0;
856 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS;
857 } else
858 ret = iw_cm_init_qp_attr(id_priv->cm_id.iw, qp_attr,
859 qp_attr_mask);
860 } else
861 ret = -ENOSYS;
862
863 return ret;
864 }
865 EXPORT_SYMBOL(rdma_init_qp_attr);
866
867 static inline int cma_zero_addr(struct sockaddr *addr)
868 {
869 switch (addr->sa_family) {
870 case AF_INET:
871 return ipv4_is_zeronet(((struct sockaddr_in *)addr)->sin_addr.s_addr);
872 case AF_INET6:
873 return ipv6_addr_any(&((struct sockaddr_in6 *) addr)->sin6_addr);
874 case AF_IB:
875 return ib_addr_any(&((struct sockaddr_ib *) addr)->sib_addr);
876 default:
877 return 0;
878 }
879 }
880
881 static inline int cma_loopback_addr(struct sockaddr *addr)
882 {
883 switch (addr->sa_family) {
884 case AF_INET:
885 return ipv4_is_loopback(((struct sockaddr_in *) addr)->sin_addr.s_addr);
886 case AF_INET6:
887 return ipv6_addr_loopback(&((struct sockaddr_in6 *) addr)->sin6_addr);
888 case AF_IB:
889 return ib_addr_loopback(&((struct sockaddr_ib *) addr)->sib_addr);
890 default:
891 return 0;
892 }
893 }
894
895 static inline int cma_any_addr(struct sockaddr *addr)
896 {
897 return cma_zero_addr(addr) || cma_loopback_addr(addr);
898 }
899
900 static int cma_addr_cmp(struct sockaddr *src, struct sockaddr *dst)
901 {
902 if (src->sa_family != dst->sa_family)
903 return -1;
904
905 switch (src->sa_family) {
906 case AF_INET:
907 return ((struct sockaddr_in *) src)->sin_addr.s_addr !=
908 ((struct sockaddr_in *) dst)->sin_addr.s_addr;
909 case AF_INET6:
910 return ipv6_addr_cmp(&((struct sockaddr_in6 *) src)->sin6_addr,
911 &((struct sockaddr_in6 *) dst)->sin6_addr);
912 default:
913 return ib_addr_cmp(&((struct sockaddr_ib *) src)->sib_addr,
914 &((struct sockaddr_ib *) dst)->sib_addr);
915 }
916 }
917
918 static __be16 cma_port(struct sockaddr *addr)
919 {
920 struct sockaddr_ib *sib;
921
922 switch (addr->sa_family) {
923 case AF_INET:
924 return ((struct sockaddr_in *) addr)->sin_port;
925 case AF_INET6:
926 return ((struct sockaddr_in6 *) addr)->sin6_port;
927 case AF_IB:
928 sib = (struct sockaddr_ib *) addr;
929 return htons((u16) (be64_to_cpu(sib->sib_sid) &
930 be64_to_cpu(sib->sib_sid_mask)));
931 default:
932 return 0;
933 }
934 }
935
936 static inline int cma_any_port(struct sockaddr *addr)
937 {
938 return !cma_port(addr);
939 }
940
941 static void cma_save_ib_info(struct sockaddr *src_addr,
942 struct sockaddr *dst_addr,
943 struct rdma_cm_id *listen_id,
944 struct ib_sa_path_rec *path)
945 {
946 struct sockaddr_ib *listen_ib, *ib;
947
948 listen_ib = (struct sockaddr_ib *) &listen_id->route.addr.src_addr;
949 if (src_addr) {
950 ib = (struct sockaddr_ib *)src_addr;
951 ib->sib_family = AF_IB;
952 if (path) {
953 ib->sib_pkey = path->pkey;
954 ib->sib_flowinfo = path->flow_label;
955 memcpy(&ib->sib_addr, &path->sgid, 16);
956 ib->sib_sid = path->service_id;
957 ib->sib_scope_id = 0;
958 } else {
959 ib->sib_pkey = listen_ib->sib_pkey;
960 ib->sib_flowinfo = listen_ib->sib_flowinfo;
961 ib->sib_addr = listen_ib->sib_addr;
962 ib->sib_sid = listen_ib->sib_sid;
963 ib->sib_scope_id = listen_ib->sib_scope_id;
964 }
965 ib->sib_sid_mask = cpu_to_be64(0xffffffffffffffffULL);
966 }
967 if (dst_addr) {
968 ib = (struct sockaddr_ib *)dst_addr;
969 ib->sib_family = AF_IB;
970 if (path) {
971 ib->sib_pkey = path->pkey;
972 ib->sib_flowinfo = path->flow_label;
973 memcpy(&ib->sib_addr, &path->dgid, 16);
974 }
975 }
976 }
977
978 static void cma_save_ip4_info(struct sockaddr *src_addr,
979 struct sockaddr *dst_addr,
980 struct cma_hdr *hdr,
981 __be16 local_port)
982 {
983 struct sockaddr_in *ip4;
984
985 if (src_addr) {
986 ip4 = (struct sockaddr_in *)src_addr;
987 ip4->sin_family = AF_INET;
988 ip4->sin_addr.s_addr = hdr->dst_addr.ip4.addr;
989 ip4->sin_port = local_port;
990 }
991
992 if (dst_addr) {
993 ip4 = (struct sockaddr_in *)dst_addr;
994 ip4->sin_family = AF_INET;
995 ip4->sin_addr.s_addr = hdr->src_addr.ip4.addr;
996 ip4->sin_port = hdr->port;
997 }
998 }
999
1000 static void cma_save_ip6_info(struct sockaddr *src_addr,
1001 struct sockaddr *dst_addr,
1002 struct cma_hdr *hdr,
1003 __be16 local_port)
1004 {
1005 struct sockaddr_in6 *ip6;
1006
1007 if (src_addr) {
1008 ip6 = (struct sockaddr_in6 *)src_addr;
1009 ip6->sin6_family = AF_INET6;
1010 ip6->sin6_addr = hdr->dst_addr.ip6;
1011 ip6->sin6_port = local_port;
1012 }
1013
1014 if (dst_addr) {
1015 ip6 = (struct sockaddr_in6 *)dst_addr;
1016 ip6->sin6_family = AF_INET6;
1017 ip6->sin6_addr = hdr->src_addr.ip6;
1018 ip6->sin6_port = hdr->port;
1019 }
1020 }
1021
1022 static u16 cma_port_from_service_id(__be64 service_id)
1023 {
1024 return (u16)be64_to_cpu(service_id);
1025 }
1026
1027 static int cma_save_ip_info(struct sockaddr *src_addr,
1028 struct sockaddr *dst_addr,
1029 struct ib_cm_event *ib_event,
1030 __be64 service_id)
1031 {
1032 struct cma_hdr *hdr;
1033 __be16 port;
1034
1035 hdr = ib_event->private_data;
1036 if (hdr->cma_version != CMA_VERSION)
1037 return -EINVAL;
1038
1039 port = htons(cma_port_from_service_id(service_id));
1040
1041 switch (cma_get_ip_ver(hdr)) {
1042 case 4:
1043 cma_save_ip4_info(src_addr, dst_addr, hdr, port);
1044 break;
1045 case 6:
1046 cma_save_ip6_info(src_addr, dst_addr, hdr, port);
1047 break;
1048 default:
1049 return -EAFNOSUPPORT;
1050 }
1051
1052 return 0;
1053 }
1054
1055 static int cma_save_net_info(struct sockaddr *src_addr,
1056 struct sockaddr *dst_addr,
1057 struct rdma_cm_id *listen_id,
1058 struct ib_cm_event *ib_event,
1059 sa_family_t sa_family, __be64 service_id)
1060 {
1061 if (sa_family == AF_IB) {
1062 if (ib_event->event == IB_CM_REQ_RECEIVED)
1063 cma_save_ib_info(src_addr, dst_addr, listen_id,
1064 ib_event->param.req_rcvd.primary_path);
1065 else if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED)
1066 cma_save_ib_info(src_addr, dst_addr, listen_id, NULL);
1067 return 0;
1068 }
1069
1070 return cma_save_ip_info(src_addr, dst_addr, ib_event, service_id);
1071 }
1072
1073 static int cma_save_req_info(const struct ib_cm_event *ib_event,
1074 struct cma_req_info *req)
1075 {
1076 const struct ib_cm_req_event_param *req_param =
1077 &ib_event->param.req_rcvd;
1078 const struct ib_cm_sidr_req_event_param *sidr_param =
1079 &ib_event->param.sidr_req_rcvd;
1080
1081 switch (ib_event->event) {
1082 case IB_CM_REQ_RECEIVED:
1083 req->device = req_param->listen_id->device;
1084 req->port = req_param->port;
1085 memcpy(&req->local_gid, &req_param->primary_path->sgid,
1086 sizeof(req->local_gid));
1087 req->has_gid = true;
1088 req->service_id = req_param->primary_path->service_id;
1089 req->pkey = be16_to_cpu(req_param->primary_path->pkey);
1090 break;
1091 case IB_CM_SIDR_REQ_RECEIVED:
1092 req->device = sidr_param->listen_id->device;
1093 req->port = sidr_param->port;
1094 req->has_gid = false;
1095 req->service_id = sidr_param->service_id;
1096 req->pkey = sidr_param->pkey;
1097 break;
1098 default:
1099 return -EINVAL;
1100 }
1101
1102 return 0;
1103 }
1104
1105 static bool validate_ipv4_net_dev(struct net_device *net_dev,
1106 const struct sockaddr_in *dst_addr,
1107 const struct sockaddr_in *src_addr)
1108 {
1109 __be32 daddr = dst_addr->sin_addr.s_addr,
1110 saddr = src_addr->sin_addr.s_addr;
1111 struct fib_result res;
1112 struct flowi4 fl4;
1113 int err;
1114 bool ret;
1115
1116 if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) ||
1117 ipv4_is_lbcast(daddr) || ipv4_is_zeronet(saddr) ||
1118 ipv4_is_zeronet(daddr) || ipv4_is_loopback(daddr) ||
1119 ipv4_is_loopback(saddr))
1120 return false;
1121
1122 memset(&fl4, 0, sizeof(fl4));
1123 fl4.flowi4_iif = net_dev->ifindex;
1124 fl4.daddr = daddr;
1125 fl4.saddr = saddr;
1126
1127 rcu_read_lock();
1128 err = fib_lookup(dev_net(net_dev), &fl4, &res, 0);
1129 ret = err == 0 && FIB_RES_DEV(res) == net_dev;
1130 rcu_read_unlock();
1131
1132 return ret;
1133 }
1134
1135 static bool validate_ipv6_net_dev(struct net_device *net_dev,
1136 const struct sockaddr_in6 *dst_addr,
1137 const struct sockaddr_in6 *src_addr)
1138 {
1139 #if IS_ENABLED(CONFIG_IPV6)
1140 const int strict = ipv6_addr_type(&dst_addr->sin6_addr) &
1141 IPV6_ADDR_LINKLOCAL;
1142 struct rt6_info *rt = rt6_lookup(dev_net(net_dev), &dst_addr->sin6_addr,
1143 &src_addr->sin6_addr, net_dev->ifindex,
1144 strict);
1145 bool ret;
1146
1147 if (!rt)
1148 return false;
1149
1150 ret = rt->rt6i_idev->dev == net_dev;
1151 ip6_rt_put(rt);
1152
1153 return ret;
1154 #else
1155 return false;
1156 #endif
1157 }
1158
1159 static bool validate_net_dev(struct net_device *net_dev,
1160 const struct sockaddr *daddr,
1161 const struct sockaddr *saddr)
1162 {
1163 const struct sockaddr_in *daddr4 = (const struct sockaddr_in *)daddr;
1164 const struct sockaddr_in *saddr4 = (const struct sockaddr_in *)saddr;
1165 const struct sockaddr_in6 *daddr6 = (const struct sockaddr_in6 *)daddr;
1166 const struct sockaddr_in6 *saddr6 = (const struct sockaddr_in6 *)saddr;
1167
1168 switch (daddr->sa_family) {
1169 case AF_INET:
1170 return saddr->sa_family == AF_INET &&
1171 validate_ipv4_net_dev(net_dev, daddr4, saddr4);
1172
1173 case AF_INET6:
1174 return saddr->sa_family == AF_INET6 &&
1175 validate_ipv6_net_dev(net_dev, daddr6, saddr6);
1176
1177 default:
1178 return false;
1179 }
1180 }
1181
1182 static struct net_device *cma_get_net_dev(struct ib_cm_event *ib_event,
1183 const struct cma_req_info *req)
1184 {
1185 struct sockaddr_storage listen_addr_storage, src_addr_storage;
1186 struct sockaddr *listen_addr = (struct sockaddr *)&listen_addr_storage,
1187 *src_addr = (struct sockaddr *)&src_addr_storage;
1188 struct net_device *net_dev;
1189 const union ib_gid *gid = req->has_gid ? &req->local_gid : NULL;
1190 int err;
1191
1192 err = cma_save_ip_info(listen_addr, src_addr, ib_event,
1193 req->service_id);
1194 if (err)
1195 return ERR_PTR(err);
1196
1197 net_dev = ib_get_net_dev_by_params(req->device, req->port, req->pkey,
1198 gid, listen_addr);
1199 if (!net_dev)
1200 return ERR_PTR(-ENODEV);
1201
1202 if (!validate_net_dev(net_dev, listen_addr, src_addr)) {
1203 dev_put(net_dev);
1204 return ERR_PTR(-EHOSTUNREACH);
1205 }
1206
1207 return net_dev;
1208 }
1209
1210 static enum rdma_port_space rdma_ps_from_service_id(__be64 service_id)
1211 {
1212 return (be64_to_cpu(service_id) >> 16) & 0xffff;
1213 }
1214
1215 static bool cma_match_private_data(struct rdma_id_private *id_priv,
1216 const struct cma_hdr *hdr)
1217 {
1218 struct sockaddr *addr = cma_src_addr(id_priv);
1219 __be32 ip4_addr;
1220 struct in6_addr ip6_addr;
1221
1222 if (cma_any_addr(addr) && !id_priv->afonly)
1223 return true;
1224
1225 switch (addr->sa_family) {
1226 case AF_INET:
1227 ip4_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
1228 if (cma_get_ip_ver(hdr) != 4)
1229 return false;
1230 if (!cma_any_addr(addr) &&
1231 hdr->dst_addr.ip4.addr != ip4_addr)
1232 return false;
1233 break;
1234 case AF_INET6:
1235 ip6_addr = ((struct sockaddr_in6 *)addr)->sin6_addr;
1236 if (cma_get_ip_ver(hdr) != 6)
1237 return false;
1238 if (!cma_any_addr(addr) &&
1239 memcmp(&hdr->dst_addr.ip6, &ip6_addr, sizeof(ip6_addr)))
1240 return false;
1241 break;
1242 case AF_IB:
1243 return true;
1244 default:
1245 return false;
1246 }
1247
1248 return true;
1249 }
1250
1251 static bool cma_protocol_roce_dev_port(struct ib_device *device, int port_num)
1252 {
1253 enum rdma_link_layer ll = rdma_port_get_link_layer(device, port_num);
1254 enum rdma_transport_type transport =
1255 rdma_node_get_transport(device->node_type);
1256
1257 return ll == IB_LINK_LAYER_ETHERNET && transport == RDMA_TRANSPORT_IB;
1258 }
1259
1260 static bool cma_protocol_roce(const struct rdma_cm_id *id)
1261 {
1262 struct ib_device *device = id->device;
1263 const int port_num = id->port_num ?: rdma_start_port(device);
1264
1265 return cma_protocol_roce_dev_port(device, port_num);
1266 }
1267
1268 static bool cma_match_net_dev(const struct rdma_cm_id *id,
1269 const struct net_device *net_dev,
1270 u8 port_num)
1271 {
1272 const struct rdma_addr *addr = &id->route.addr;
1273
1274 if (!net_dev)
1275 /* This request is an AF_IB request or a RoCE request */
1276 return (!id->port_num || id->port_num == port_num) &&
1277 (addr->src_addr.ss_family == AF_IB ||
1278 cma_protocol_roce_dev_port(id->device, port_num));
1279
1280 return !addr->dev_addr.bound_dev_if ||
1281 (net_eq(dev_net(net_dev), addr->dev_addr.net) &&
1282 addr->dev_addr.bound_dev_if == net_dev->ifindex);
1283 }
1284
1285 static struct rdma_id_private *cma_find_listener(
1286 const struct rdma_bind_list *bind_list,
1287 const struct ib_cm_id *cm_id,
1288 const struct ib_cm_event *ib_event,
1289 const struct cma_req_info *req,
1290 const struct net_device *net_dev)
1291 {
1292 struct rdma_id_private *id_priv, *id_priv_dev;
1293
1294 if (!bind_list)
1295 return ERR_PTR(-EINVAL);
1296
1297 hlist_for_each_entry(id_priv, &bind_list->owners, node) {
1298 if (cma_match_private_data(id_priv, ib_event->private_data)) {
1299 if (id_priv->id.device == cm_id->device &&
1300 cma_match_net_dev(&id_priv->id, net_dev, req->port))
1301 return id_priv;
1302 list_for_each_entry(id_priv_dev,
1303 &id_priv->listen_list,
1304 listen_list) {
1305 if (id_priv_dev->id.device == cm_id->device &&
1306 cma_match_net_dev(&id_priv_dev->id, net_dev, req->port))
1307 return id_priv_dev;
1308 }
1309 }
1310 }
1311
1312 return ERR_PTR(-EINVAL);
1313 }
1314
1315 static struct rdma_id_private *cma_id_from_event(struct ib_cm_id *cm_id,
1316 struct ib_cm_event *ib_event,
1317 struct net_device **net_dev)
1318 {
1319 struct cma_req_info req;
1320 struct rdma_bind_list *bind_list;
1321 struct rdma_id_private *id_priv;
1322 int err;
1323
1324 err = cma_save_req_info(ib_event, &req);
1325 if (err)
1326 return ERR_PTR(err);
1327
1328 *net_dev = cma_get_net_dev(ib_event, &req);
1329 if (IS_ERR(*net_dev)) {
1330 if (PTR_ERR(*net_dev) == -EAFNOSUPPORT) {
1331 /* Assuming the protocol is AF_IB */
1332 *net_dev = NULL;
1333 } else if (cma_protocol_roce_dev_port(req.device, req.port)) {
1334 /* TODO find the net dev matching the request parameters
1335 * through the RoCE GID table */
1336 *net_dev = NULL;
1337 } else {
1338 return ERR_CAST(*net_dev);
1339 }
1340 }
1341
1342 bind_list = cma_ps_find(*net_dev ? dev_net(*net_dev) : &init_net,
1343 rdma_ps_from_service_id(req.service_id),
1344 cma_port_from_service_id(req.service_id));
1345 id_priv = cma_find_listener(bind_list, cm_id, ib_event, &req, *net_dev);
1346 if (IS_ERR(id_priv) && *net_dev) {
1347 dev_put(*net_dev);
1348 *net_dev = NULL;
1349 }
1350
1351 return id_priv;
1352 }
1353
1354 static inline int cma_user_data_offset(struct rdma_id_private *id_priv)
1355 {
1356 return cma_family(id_priv) == AF_IB ? 0 : sizeof(struct cma_hdr);
1357 }
1358
1359 static void cma_cancel_route(struct rdma_id_private *id_priv)
1360 {
1361 if (rdma_cap_ib_sa(id_priv->id.device, id_priv->id.port_num)) {
1362 if (id_priv->query)
1363 ib_sa_cancel_query(id_priv->query_id, id_priv->query);
1364 }
1365 }
1366
1367 static void cma_cancel_listens(struct rdma_id_private *id_priv)
1368 {
1369 struct rdma_id_private *dev_id_priv;
1370
1371 /*
1372 * Remove from listen_any_list to prevent added devices from spawning
1373 * additional listen requests.
1374 */
1375 mutex_lock(&lock);
1376 list_del(&id_priv->list);
1377
1378 while (!list_empty(&id_priv->listen_list)) {
1379 dev_id_priv = list_entry(id_priv->listen_list.next,
1380 struct rdma_id_private, listen_list);
1381 /* sync with device removal to avoid duplicate destruction */
1382 list_del_init(&dev_id_priv->list);
1383 list_del(&dev_id_priv->listen_list);
1384 mutex_unlock(&lock);
1385
1386 rdma_destroy_id(&dev_id_priv->id);
1387 mutex_lock(&lock);
1388 }
1389 mutex_unlock(&lock);
1390 }
1391
1392 static void cma_cancel_operation(struct rdma_id_private *id_priv,
1393 enum rdma_cm_state state)
1394 {
1395 switch (state) {
1396 case RDMA_CM_ADDR_QUERY:
1397 rdma_addr_cancel(&id_priv->id.route.addr.dev_addr);
1398 break;
1399 case RDMA_CM_ROUTE_QUERY:
1400 cma_cancel_route(id_priv);
1401 break;
1402 case RDMA_CM_LISTEN:
1403 if (cma_any_addr(cma_src_addr(id_priv)) && !id_priv->cma_dev)
1404 cma_cancel_listens(id_priv);
1405 break;
1406 default:
1407 break;
1408 }
1409 }
1410
1411 static void cma_release_port(struct rdma_id_private *id_priv)
1412 {
1413 struct rdma_bind_list *bind_list = id_priv->bind_list;
1414 struct net *net = id_priv->id.route.addr.dev_addr.net;
1415
1416 if (!bind_list)
1417 return;
1418
1419 mutex_lock(&lock);
1420 hlist_del(&id_priv->node);
1421 if (hlist_empty(&bind_list->owners)) {
1422 cma_ps_remove(net, bind_list->ps, bind_list->port);
1423 kfree(bind_list);
1424 }
1425 mutex_unlock(&lock);
1426 }
1427
1428 static void cma_leave_mc_groups(struct rdma_id_private *id_priv)
1429 {
1430 struct cma_multicast *mc;
1431
1432 while (!list_empty(&id_priv->mc_list)) {
1433 mc = container_of(id_priv->mc_list.next,
1434 struct cma_multicast, list);
1435 list_del(&mc->list);
1436 if (rdma_cap_ib_mcast(id_priv->cma_dev->device,
1437 id_priv->id.port_num)) {
1438 ib_sa_free_multicast(mc->multicast.ib);
1439 kfree(mc);
1440 } else
1441 kref_put(&mc->mcref, release_mc);
1442 }
1443 }
1444
1445 void rdma_destroy_id(struct rdma_cm_id *id)
1446 {
1447 struct rdma_id_private *id_priv;
1448 enum rdma_cm_state state;
1449
1450 id_priv = container_of(id, struct rdma_id_private, id);
1451 state = cma_exch(id_priv, RDMA_CM_DESTROYING);
1452 cma_cancel_operation(id_priv, state);
1453
1454 /*
1455 * Wait for any active callback to finish. New callbacks will find
1456 * the id_priv state set to destroying and abort.
1457 */
1458 mutex_lock(&id_priv->handler_mutex);
1459 mutex_unlock(&id_priv->handler_mutex);
1460
1461 if (id_priv->cma_dev) {
1462 if (rdma_cap_ib_cm(id_priv->id.device, 1)) {
1463 if (id_priv->cm_id.ib)
1464 ib_destroy_cm_id(id_priv->cm_id.ib);
1465 } else if (rdma_cap_iw_cm(id_priv->id.device, 1)) {
1466 if (id_priv->cm_id.iw)
1467 iw_destroy_cm_id(id_priv->cm_id.iw);
1468 }
1469 cma_leave_mc_groups(id_priv);
1470 cma_release_dev(id_priv);
1471 }
1472
1473 cma_release_port(id_priv);
1474 cma_deref_id(id_priv);
1475 wait_for_completion(&id_priv->comp);
1476
1477 if (id_priv->internal_id)
1478 cma_deref_id(id_priv->id.context);
1479
1480 kfree(id_priv->id.route.path_rec);
1481 put_net(id_priv->id.route.addr.dev_addr.net);
1482 kfree(id_priv);
1483 }
1484 EXPORT_SYMBOL(rdma_destroy_id);
1485
1486 static int cma_rep_recv(struct rdma_id_private *id_priv)
1487 {
1488 int ret;
1489
1490 ret = cma_modify_qp_rtr(id_priv, NULL);
1491 if (ret)
1492 goto reject;
1493
1494 ret = cma_modify_qp_rts(id_priv, NULL);
1495 if (ret)
1496 goto reject;
1497
1498 ret = ib_send_cm_rtu(id_priv->cm_id.ib, NULL, 0);
1499 if (ret)
1500 goto reject;
1501
1502 return 0;
1503 reject:
1504 cma_modify_qp_err(id_priv);
1505 ib_send_cm_rej(id_priv->cm_id.ib, IB_CM_REJ_CONSUMER_DEFINED,
1506 NULL, 0, NULL, 0);
1507 return ret;
1508 }
1509
1510 static void cma_set_rep_event_data(struct rdma_cm_event *event,
1511 struct ib_cm_rep_event_param *rep_data,
1512 void *private_data)
1513 {
1514 event->param.conn.private_data = private_data;
1515 event->param.conn.private_data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
1516 event->param.conn.responder_resources = rep_data->responder_resources;
1517 event->param.conn.initiator_depth = rep_data->initiator_depth;
1518 event->param.conn.flow_control = rep_data->flow_control;
1519 event->param.conn.rnr_retry_count = rep_data->rnr_retry_count;
1520 event->param.conn.srq = rep_data->srq;
1521 event->param.conn.qp_num = rep_data->remote_qpn;
1522 }
1523
1524 static int cma_ib_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
1525 {
1526 struct rdma_id_private *id_priv = cm_id->context;
1527 struct rdma_cm_event event;
1528 int ret = 0;
1529
1530 if ((ib_event->event != IB_CM_TIMEWAIT_EXIT &&
1531 cma_disable_callback(id_priv, RDMA_CM_CONNECT)) ||
1532 (ib_event->event == IB_CM_TIMEWAIT_EXIT &&
1533 cma_disable_callback(id_priv, RDMA_CM_DISCONNECT)))
1534 return 0;
1535
1536 memset(&event, 0, sizeof event);
1537 switch (ib_event->event) {
1538 case IB_CM_REQ_ERROR:
1539 case IB_CM_REP_ERROR:
1540 event.event = RDMA_CM_EVENT_UNREACHABLE;
1541 event.status = -ETIMEDOUT;
1542 break;
1543 case IB_CM_REP_RECEIVED:
1544 if (id_priv->id.qp) {
1545 event.status = cma_rep_recv(id_priv);
1546 event.event = event.status ? RDMA_CM_EVENT_CONNECT_ERROR :
1547 RDMA_CM_EVENT_ESTABLISHED;
1548 } else {
1549 event.event = RDMA_CM_EVENT_CONNECT_RESPONSE;
1550 }
1551 cma_set_rep_event_data(&event, &ib_event->param.rep_rcvd,
1552 ib_event->private_data);
1553 break;
1554 case IB_CM_RTU_RECEIVED:
1555 case IB_CM_USER_ESTABLISHED:
1556 event.event = RDMA_CM_EVENT_ESTABLISHED;
1557 break;
1558 case IB_CM_DREQ_ERROR:
1559 event.status = -ETIMEDOUT; /* fall through */
1560 case IB_CM_DREQ_RECEIVED:
1561 case IB_CM_DREP_RECEIVED:
1562 if (!cma_comp_exch(id_priv, RDMA_CM_CONNECT,
1563 RDMA_CM_DISCONNECT))
1564 goto out;
1565 event.event = RDMA_CM_EVENT_DISCONNECTED;
1566 break;
1567 case IB_CM_TIMEWAIT_EXIT:
1568 event.event = RDMA_CM_EVENT_TIMEWAIT_EXIT;
1569 break;
1570 case IB_CM_MRA_RECEIVED:
1571 /* ignore event */
1572 goto out;
1573 case IB_CM_REJ_RECEIVED:
1574 cma_modify_qp_err(id_priv);
1575 event.status = ib_event->param.rej_rcvd.reason;
1576 event.event = RDMA_CM_EVENT_REJECTED;
1577 event.param.conn.private_data = ib_event->private_data;
1578 event.param.conn.private_data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
1579 break;
1580 default:
1581 printk(KERN_ERR "RDMA CMA: unexpected IB CM event: %d\n",
1582 ib_event->event);
1583 goto out;
1584 }
1585
1586 ret = id_priv->id.event_handler(&id_priv->id, &event);
1587 if (ret) {
1588 /* Destroy the CM ID by returning a non-zero value. */
1589 id_priv->cm_id.ib = NULL;
1590 cma_exch(id_priv, RDMA_CM_DESTROYING);
1591 mutex_unlock(&id_priv->handler_mutex);
1592 rdma_destroy_id(&id_priv->id);
1593 return ret;
1594 }
1595 out:
1596 mutex_unlock(&id_priv->handler_mutex);
1597 return ret;
1598 }
1599
1600 static struct rdma_id_private *cma_new_conn_id(struct rdma_cm_id *listen_id,
1601 struct ib_cm_event *ib_event,
1602 struct net_device *net_dev)
1603 {
1604 struct rdma_id_private *id_priv;
1605 struct rdma_cm_id *id;
1606 struct rdma_route *rt;
1607 const sa_family_t ss_family = listen_id->route.addr.src_addr.ss_family;
1608 const __be64 service_id =
1609 ib_event->param.req_rcvd.primary_path->service_id;
1610 int ret;
1611
1612 id = rdma_create_id(listen_id->route.addr.dev_addr.net,
1613 listen_id->event_handler, listen_id->context,
1614 listen_id->ps, ib_event->param.req_rcvd.qp_type);
1615 if (IS_ERR(id))
1616 return NULL;
1617
1618 id_priv = container_of(id, struct rdma_id_private, id);
1619 if (cma_save_net_info((struct sockaddr *)&id->route.addr.src_addr,
1620 (struct sockaddr *)&id->route.addr.dst_addr,
1621 listen_id, ib_event, ss_family, service_id))
1622 goto err;
1623
1624 rt = &id->route;
1625 rt->num_paths = ib_event->param.req_rcvd.alternate_path ? 2 : 1;
1626 rt->path_rec = kmalloc(sizeof *rt->path_rec * rt->num_paths,
1627 GFP_KERNEL);
1628 if (!rt->path_rec)
1629 goto err;
1630
1631 rt->path_rec[0] = *ib_event->param.req_rcvd.primary_path;
1632 if (rt->num_paths == 2)
1633 rt->path_rec[1] = *ib_event->param.req_rcvd.alternate_path;
1634
1635 if (net_dev) {
1636 ret = rdma_copy_addr(&rt->addr.dev_addr, net_dev, NULL);
1637 if (ret)
1638 goto err;
1639 } else {
1640 if (!cma_protocol_roce(listen_id) &&
1641 cma_any_addr(cma_src_addr(id_priv))) {
1642 rt->addr.dev_addr.dev_type = ARPHRD_INFINIBAND;
1643 rdma_addr_set_sgid(&rt->addr.dev_addr, &rt->path_rec[0].sgid);
1644 ib_addr_set_pkey(&rt->addr.dev_addr, be16_to_cpu(rt->path_rec[0].pkey));
1645 } else if (!cma_any_addr(cma_src_addr(id_priv))) {
1646 ret = cma_translate_addr(cma_src_addr(id_priv), &rt->addr.dev_addr);
1647 if (ret)
1648 goto err;
1649 }
1650 }
1651 rdma_addr_set_dgid(&rt->addr.dev_addr, &rt->path_rec[0].dgid);
1652
1653 id_priv->state = RDMA_CM_CONNECT;
1654 return id_priv;
1655
1656 err:
1657 rdma_destroy_id(id);
1658 return NULL;
1659 }
1660
1661 static struct rdma_id_private *cma_new_udp_id(struct rdma_cm_id *listen_id,
1662 struct ib_cm_event *ib_event,
1663 struct net_device *net_dev)
1664 {
1665 struct rdma_id_private *id_priv;
1666 struct rdma_cm_id *id;
1667 const sa_family_t ss_family = listen_id->route.addr.src_addr.ss_family;
1668 struct net *net = listen_id->route.addr.dev_addr.net;
1669 int ret;
1670
1671 id = rdma_create_id(net, listen_id->event_handler, listen_id->context,
1672 listen_id->ps, IB_QPT_UD);
1673 if (IS_ERR(id))
1674 return NULL;
1675
1676 id_priv = container_of(id, struct rdma_id_private, id);
1677 if (cma_save_net_info((struct sockaddr *)&id->route.addr.src_addr,
1678 (struct sockaddr *)&id->route.addr.dst_addr,
1679 listen_id, ib_event, ss_family,
1680 ib_event->param.sidr_req_rcvd.service_id))
1681 goto err;
1682
1683 if (net_dev) {
1684 ret = rdma_copy_addr(&id->route.addr.dev_addr, net_dev, NULL);
1685 if (ret)
1686 goto err;
1687 } else {
1688 if (!cma_any_addr(cma_src_addr(id_priv))) {
1689 ret = cma_translate_addr(cma_src_addr(id_priv),
1690 &id->route.addr.dev_addr);
1691 if (ret)
1692 goto err;
1693 }
1694 }
1695
1696 id_priv->state = RDMA_CM_CONNECT;
1697 return id_priv;
1698 err:
1699 rdma_destroy_id(id);
1700 return NULL;
1701 }
1702
1703 static void cma_set_req_event_data(struct rdma_cm_event *event,
1704 struct ib_cm_req_event_param *req_data,
1705 void *private_data, int offset)
1706 {
1707 event->param.conn.private_data = private_data + offset;
1708 event->param.conn.private_data_len = IB_CM_REQ_PRIVATE_DATA_SIZE - offset;
1709 event->param.conn.responder_resources = req_data->responder_resources;
1710 event->param.conn.initiator_depth = req_data->initiator_depth;
1711 event->param.conn.flow_control = req_data->flow_control;
1712 event->param.conn.retry_count = req_data->retry_count;
1713 event->param.conn.rnr_retry_count = req_data->rnr_retry_count;
1714 event->param.conn.srq = req_data->srq;
1715 event->param.conn.qp_num = req_data->remote_qpn;
1716 }
1717
1718 static int cma_check_req_qp_type(struct rdma_cm_id *id, struct ib_cm_event *ib_event)
1719 {
1720 return (((ib_event->event == IB_CM_REQ_RECEIVED) &&
1721 (ib_event->param.req_rcvd.qp_type == id->qp_type)) ||
1722 ((ib_event->event == IB_CM_SIDR_REQ_RECEIVED) &&
1723 (id->qp_type == IB_QPT_UD)) ||
1724 (!id->qp_type));
1725 }
1726
1727 static int cma_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
1728 {
1729 struct rdma_id_private *listen_id, *conn_id;
1730 struct rdma_cm_event event;
1731 struct net_device *net_dev;
1732 int offset, ret;
1733
1734 listen_id = cma_id_from_event(cm_id, ib_event, &net_dev);
1735 if (IS_ERR(listen_id))
1736 return PTR_ERR(listen_id);
1737
1738 if (!cma_check_req_qp_type(&listen_id->id, ib_event)) {
1739 ret = -EINVAL;
1740 goto net_dev_put;
1741 }
1742
1743 if (cma_disable_callback(listen_id, RDMA_CM_LISTEN)) {
1744 ret = -ECONNABORTED;
1745 goto net_dev_put;
1746 }
1747
1748 memset(&event, 0, sizeof event);
1749 offset = cma_user_data_offset(listen_id);
1750 event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
1751 if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED) {
1752 conn_id = cma_new_udp_id(&listen_id->id, ib_event, net_dev);
1753 event.param.ud.private_data = ib_event->private_data + offset;
1754 event.param.ud.private_data_len =
1755 IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE - offset;
1756 } else {
1757 conn_id = cma_new_conn_id(&listen_id->id, ib_event, net_dev);
1758 cma_set_req_event_data(&event, &ib_event->param.req_rcvd,
1759 ib_event->private_data, offset);
1760 }
1761 if (!conn_id) {
1762 ret = -ENOMEM;
1763 goto err1;
1764 }
1765
1766 mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
1767 ret = cma_acquire_dev(conn_id, listen_id);
1768 if (ret)
1769 goto err2;
1770
1771 conn_id->cm_id.ib = cm_id;
1772 cm_id->context = conn_id;
1773 cm_id->cm_handler = cma_ib_handler;
1774
1775 /*
1776 * Protect against the user destroying conn_id from another thread
1777 * until we're done accessing it.
1778 */
1779 atomic_inc(&conn_id->refcount);
1780 ret = conn_id->id.event_handler(&conn_id->id, &event);
1781 if (ret)
1782 goto err3;
1783 /*
1784 * Acquire mutex to prevent user executing rdma_destroy_id()
1785 * while we're accessing the cm_id.
1786 */
1787 mutex_lock(&lock);
1788 if (cma_comp(conn_id, RDMA_CM_CONNECT) &&
1789 (conn_id->id.qp_type != IB_QPT_UD))
1790 ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0);
1791 mutex_unlock(&lock);
1792 mutex_unlock(&conn_id->handler_mutex);
1793 mutex_unlock(&listen_id->handler_mutex);
1794 cma_deref_id(conn_id);
1795 if (net_dev)
1796 dev_put(net_dev);
1797 return 0;
1798
1799 err3:
1800 cma_deref_id(conn_id);
1801 /* Destroy the CM ID by returning a non-zero value. */
1802 conn_id->cm_id.ib = NULL;
1803 err2:
1804 cma_exch(conn_id, RDMA_CM_DESTROYING);
1805 mutex_unlock(&conn_id->handler_mutex);
1806 err1:
1807 mutex_unlock(&listen_id->handler_mutex);
1808 if (conn_id)
1809 rdma_destroy_id(&conn_id->id);
1810
1811 net_dev_put:
1812 if (net_dev)
1813 dev_put(net_dev);
1814
1815 return ret;
1816 }
1817
1818 __be64 rdma_get_service_id(struct rdma_cm_id *id, struct sockaddr *addr)
1819 {
1820 if (addr->sa_family == AF_IB)
1821 return ((struct sockaddr_ib *) addr)->sib_sid;
1822
1823 return cpu_to_be64(((u64)id->ps << 16) + be16_to_cpu(cma_port(addr)));
1824 }
1825 EXPORT_SYMBOL(rdma_get_service_id);
1826
1827 static int cma_iw_handler(struct iw_cm_id *iw_id, struct iw_cm_event *iw_event)
1828 {
1829 struct rdma_id_private *id_priv = iw_id->context;
1830 struct rdma_cm_event event;
1831 int ret = 0;
1832 struct sockaddr *laddr = (struct sockaddr *)&iw_event->local_addr;
1833 struct sockaddr *raddr = (struct sockaddr *)&iw_event->remote_addr;
1834
1835 if (cma_disable_callback(id_priv, RDMA_CM_CONNECT))
1836 return 0;
1837
1838 memset(&event, 0, sizeof event);
1839 switch (iw_event->event) {
1840 case IW_CM_EVENT_CLOSE:
1841 event.event = RDMA_CM_EVENT_DISCONNECTED;
1842 break;
1843 case IW_CM_EVENT_CONNECT_REPLY:
1844 memcpy(cma_src_addr(id_priv), laddr,
1845 rdma_addr_size(laddr));
1846 memcpy(cma_dst_addr(id_priv), raddr,
1847 rdma_addr_size(raddr));
1848 switch (iw_event->status) {
1849 case 0:
1850 event.event = RDMA_CM_EVENT_ESTABLISHED;
1851 event.param.conn.initiator_depth = iw_event->ird;
1852 event.param.conn.responder_resources = iw_event->ord;
1853 break;
1854 case -ECONNRESET:
1855 case -ECONNREFUSED:
1856 event.event = RDMA_CM_EVENT_REJECTED;
1857 break;
1858 case -ETIMEDOUT:
1859 event.event = RDMA_CM_EVENT_UNREACHABLE;
1860 break;
1861 default:
1862 event.event = RDMA_CM_EVENT_CONNECT_ERROR;
1863 break;
1864 }
1865 break;
1866 case IW_CM_EVENT_ESTABLISHED:
1867 event.event = RDMA_CM_EVENT_ESTABLISHED;
1868 event.param.conn.initiator_depth = iw_event->ird;
1869 event.param.conn.responder_resources = iw_event->ord;
1870 break;
1871 default:
1872 BUG_ON(1);
1873 }
1874
1875 event.status = iw_event->status;
1876 event.param.conn.private_data = iw_event->private_data;
1877 event.param.conn.private_data_len = iw_event->private_data_len;
1878 ret = id_priv->id.event_handler(&id_priv->id, &event);
1879 if (ret) {
1880 /* Destroy the CM ID by returning a non-zero value. */
1881 id_priv->cm_id.iw = NULL;
1882 cma_exch(id_priv, RDMA_CM_DESTROYING);
1883 mutex_unlock(&id_priv->handler_mutex);
1884 rdma_destroy_id(&id_priv->id);
1885 return ret;
1886 }
1887
1888 mutex_unlock(&id_priv->handler_mutex);
1889 return ret;
1890 }
1891
1892 static int iw_conn_req_handler(struct iw_cm_id *cm_id,
1893 struct iw_cm_event *iw_event)
1894 {
1895 struct rdma_cm_id *new_cm_id;
1896 struct rdma_id_private *listen_id, *conn_id;
1897 struct rdma_cm_event event;
1898 int ret;
1899 struct ib_device_attr attr;
1900 struct sockaddr *laddr = (struct sockaddr *)&iw_event->local_addr;
1901 struct sockaddr *raddr = (struct sockaddr *)&iw_event->remote_addr;
1902
1903 listen_id = cm_id->context;
1904 if (cma_disable_callback(listen_id, RDMA_CM_LISTEN))
1905 return -ECONNABORTED;
1906
1907 /* Create a new RDMA id for the new IW CM ID */
1908 new_cm_id = rdma_create_id(listen_id->id.route.addr.dev_addr.net,
1909 listen_id->id.event_handler,
1910 listen_id->id.context,
1911 RDMA_PS_TCP, IB_QPT_RC);
1912 if (IS_ERR(new_cm_id)) {
1913 ret = -ENOMEM;
1914 goto out;
1915 }
1916 conn_id = container_of(new_cm_id, struct rdma_id_private, id);
1917 mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
1918 conn_id->state = RDMA_CM_CONNECT;
1919
1920 ret = rdma_translate_ip(laddr, &conn_id->id.route.addr.dev_addr, NULL);
1921 if (ret) {
1922 mutex_unlock(&conn_id->handler_mutex);
1923 rdma_destroy_id(new_cm_id);
1924 goto out;
1925 }
1926
1927 ret = cma_acquire_dev(conn_id, listen_id);
1928 if (ret) {
1929 mutex_unlock(&conn_id->handler_mutex);
1930 rdma_destroy_id(new_cm_id);
1931 goto out;
1932 }
1933
1934 conn_id->cm_id.iw = cm_id;
1935 cm_id->context = conn_id;
1936 cm_id->cm_handler = cma_iw_handler;
1937
1938 memcpy(cma_src_addr(conn_id), laddr, rdma_addr_size(laddr));
1939 memcpy(cma_dst_addr(conn_id), raddr, rdma_addr_size(raddr));
1940
1941 ret = ib_query_device(conn_id->id.device, &attr);
1942 if (ret) {
1943 mutex_unlock(&conn_id->handler_mutex);
1944 rdma_destroy_id(new_cm_id);
1945 goto out;
1946 }
1947
1948 memset(&event, 0, sizeof event);
1949 event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
1950 event.param.conn.private_data = iw_event->private_data;
1951 event.param.conn.private_data_len = iw_event->private_data_len;
1952 event.param.conn.initiator_depth = iw_event->ird;
1953 event.param.conn.responder_resources = iw_event->ord;
1954
1955 /*
1956 * Protect against the user destroying conn_id from another thread
1957 * until we're done accessing it.
1958 */
1959 atomic_inc(&conn_id->refcount);
1960 ret = conn_id->id.event_handler(&conn_id->id, &event);
1961 if (ret) {
1962 /* User wants to destroy the CM ID */
1963 conn_id->cm_id.iw = NULL;
1964 cma_exch(conn_id, RDMA_CM_DESTROYING);
1965 mutex_unlock(&conn_id->handler_mutex);
1966 cma_deref_id(conn_id);
1967 rdma_destroy_id(&conn_id->id);
1968 goto out;
1969 }
1970
1971 mutex_unlock(&conn_id->handler_mutex);
1972 cma_deref_id(conn_id);
1973
1974 out:
1975 mutex_unlock(&listen_id->handler_mutex);
1976 return ret;
1977 }
1978
1979 static int cma_ib_listen(struct rdma_id_private *id_priv)
1980 {
1981 struct sockaddr *addr;
1982 struct ib_cm_id *id;
1983 __be64 svc_id;
1984
1985 addr = cma_src_addr(id_priv);
1986 svc_id = rdma_get_service_id(&id_priv->id, addr);
1987 id = ib_cm_insert_listen(id_priv->id.device, cma_req_handler, svc_id);
1988 if (IS_ERR(id))
1989 return PTR_ERR(id);
1990 id_priv->cm_id.ib = id;
1991
1992 return 0;
1993 }
1994
1995 static int cma_iw_listen(struct rdma_id_private *id_priv, int backlog)
1996 {
1997 int ret;
1998 struct iw_cm_id *id;
1999
2000 id = iw_create_cm_id(id_priv->id.device,
2001 iw_conn_req_handler,
2002 id_priv);
2003 if (IS_ERR(id))
2004 return PTR_ERR(id);
2005
2006 id->tos = id_priv->tos;
2007 id_priv->cm_id.iw = id;
2008
2009 memcpy(&id_priv->cm_id.iw->local_addr, cma_src_addr(id_priv),
2010 rdma_addr_size(cma_src_addr(id_priv)));
2011
2012 ret = iw_cm_listen(id_priv->cm_id.iw, backlog);
2013
2014 if (ret) {
2015 iw_destroy_cm_id(id_priv->cm_id.iw);
2016 id_priv->cm_id.iw = NULL;
2017 }
2018
2019 return ret;
2020 }
2021
2022 static int cma_listen_handler(struct rdma_cm_id *id,
2023 struct rdma_cm_event *event)
2024 {
2025 struct rdma_id_private *id_priv = id->context;
2026
2027 id->context = id_priv->id.context;
2028 id->event_handler = id_priv->id.event_handler;
2029 return id_priv->id.event_handler(id, event);
2030 }
2031
2032 static void cma_listen_on_dev(struct rdma_id_private *id_priv,
2033 struct cma_device *cma_dev)
2034 {
2035 struct rdma_id_private *dev_id_priv;
2036 struct rdma_cm_id *id;
2037 struct net *net = id_priv->id.route.addr.dev_addr.net;
2038 int ret;
2039
2040 if (cma_family(id_priv) == AF_IB && !rdma_cap_ib_cm(cma_dev->device, 1))
2041 return;
2042
2043 id = rdma_create_id(net, cma_listen_handler, id_priv, id_priv->id.ps,
2044 id_priv->id.qp_type);
2045 if (IS_ERR(id))
2046 return;
2047
2048 dev_id_priv = container_of(id, struct rdma_id_private, id);
2049
2050 dev_id_priv->state = RDMA_CM_ADDR_BOUND;
2051 memcpy(cma_src_addr(dev_id_priv), cma_src_addr(id_priv),
2052 rdma_addr_size(cma_src_addr(id_priv)));
2053
2054 cma_attach_to_dev(dev_id_priv, cma_dev);
2055 list_add_tail(&dev_id_priv->listen_list, &id_priv->listen_list);
2056 atomic_inc(&id_priv->refcount);
2057 dev_id_priv->internal_id = 1;
2058 dev_id_priv->afonly = id_priv->afonly;
2059
2060 ret = rdma_listen(id, id_priv->backlog);
2061 if (ret)
2062 printk(KERN_WARNING "RDMA CMA: cma_listen_on_dev, error %d, "
2063 "listening on device %s\n", ret, cma_dev->device->name);
2064 }
2065
2066 static void cma_listen_on_all(struct rdma_id_private *id_priv)
2067 {
2068 struct cma_device *cma_dev;
2069
2070 mutex_lock(&lock);
2071 list_add_tail(&id_priv->list, &listen_any_list);
2072 list_for_each_entry(cma_dev, &dev_list, list)
2073 cma_listen_on_dev(id_priv, cma_dev);
2074 mutex_unlock(&lock);
2075 }
2076
2077 void rdma_set_service_type(struct rdma_cm_id *id, int tos)
2078 {
2079 struct rdma_id_private *id_priv;
2080
2081 id_priv = container_of(id, struct rdma_id_private, id);
2082 id_priv->tos = (u8) tos;
2083 }
2084 EXPORT_SYMBOL(rdma_set_service_type);
2085
2086 static void cma_query_handler(int status, struct ib_sa_path_rec *path_rec,
2087 void *context)
2088 {
2089 struct cma_work *work = context;
2090 struct rdma_route *route;
2091
2092 route = &work->id->id.route;
2093
2094 if (!status) {
2095 route->num_paths = 1;
2096 *route->path_rec = *path_rec;
2097 } else {
2098 work->old_state = RDMA_CM_ROUTE_QUERY;
2099 work->new_state = RDMA_CM_ADDR_RESOLVED;
2100 work->event.event = RDMA_CM_EVENT_ROUTE_ERROR;
2101 work->event.status = status;
2102 }
2103
2104 queue_work(cma_wq, &work->work);
2105 }
2106
2107 static int cma_query_ib_route(struct rdma_id_private *id_priv, int timeout_ms,
2108 struct cma_work *work)
2109 {
2110 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
2111 struct ib_sa_path_rec path_rec;
2112 ib_sa_comp_mask comp_mask;
2113 struct sockaddr_in6 *sin6;
2114 struct sockaddr_ib *sib;
2115
2116 memset(&path_rec, 0, sizeof path_rec);
2117 rdma_addr_get_sgid(dev_addr, &path_rec.sgid);
2118 rdma_addr_get_dgid(dev_addr, &path_rec.dgid);
2119 path_rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
2120 path_rec.numb_path = 1;
2121 path_rec.reversible = 1;
2122 path_rec.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
2123
2124 comp_mask = IB_SA_PATH_REC_DGID | IB_SA_PATH_REC_SGID |
2125 IB_SA_PATH_REC_PKEY | IB_SA_PATH_REC_NUMB_PATH |
2126 IB_SA_PATH_REC_REVERSIBLE | IB_SA_PATH_REC_SERVICE_ID;
2127
2128 switch (cma_family(id_priv)) {
2129 case AF_INET:
2130 path_rec.qos_class = cpu_to_be16((u16) id_priv->tos);
2131 comp_mask |= IB_SA_PATH_REC_QOS_CLASS;
2132 break;
2133 case AF_INET6:
2134 sin6 = (struct sockaddr_in6 *) cma_src_addr(id_priv);
2135 path_rec.traffic_class = (u8) (be32_to_cpu(sin6->sin6_flowinfo) >> 20);
2136 comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
2137 break;
2138 case AF_IB:
2139 sib = (struct sockaddr_ib *) cma_src_addr(id_priv);
2140 path_rec.traffic_class = (u8) (be32_to_cpu(sib->sib_flowinfo) >> 20);
2141 comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
2142 break;
2143 }
2144
2145 id_priv->query_id = ib_sa_path_rec_get(&sa_client, id_priv->id.device,
2146 id_priv->id.port_num, &path_rec,
2147 comp_mask, timeout_ms,
2148 GFP_KERNEL, cma_query_handler,
2149 work, &id_priv->query);
2150
2151 return (id_priv->query_id < 0) ? id_priv->query_id : 0;
2152 }
2153
2154 static void cma_work_handler(struct work_struct *_work)
2155 {
2156 struct cma_work *work = container_of(_work, struct cma_work, work);
2157 struct rdma_id_private *id_priv = work->id;
2158 int destroy = 0;
2159
2160 mutex_lock(&id_priv->handler_mutex);
2161 if (!cma_comp_exch(id_priv, work->old_state, work->new_state))
2162 goto out;
2163
2164 if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
2165 cma_exch(id_priv, RDMA_CM_DESTROYING);
2166 destroy = 1;
2167 }
2168 out:
2169 mutex_unlock(&id_priv->handler_mutex);
2170 cma_deref_id(id_priv);
2171 if (destroy)
2172 rdma_destroy_id(&id_priv->id);
2173 kfree(work);
2174 }
2175
2176 static void cma_ndev_work_handler(struct work_struct *_work)
2177 {
2178 struct cma_ndev_work *work = container_of(_work, struct cma_ndev_work, work);
2179 struct rdma_id_private *id_priv = work->id;
2180 int destroy = 0;
2181
2182 mutex_lock(&id_priv->handler_mutex);
2183 if (id_priv->state == RDMA_CM_DESTROYING ||
2184 id_priv->state == RDMA_CM_DEVICE_REMOVAL)
2185 goto out;
2186
2187 if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
2188 cma_exch(id_priv, RDMA_CM_DESTROYING);
2189 destroy = 1;
2190 }
2191
2192 out:
2193 mutex_unlock(&id_priv->handler_mutex);
2194 cma_deref_id(id_priv);
2195 if (destroy)
2196 rdma_destroy_id(&id_priv->id);
2197 kfree(work);
2198 }
2199
2200 static int cma_resolve_ib_route(struct rdma_id_private *id_priv, int timeout_ms)
2201 {
2202 struct rdma_route *route = &id_priv->id.route;
2203 struct cma_work *work;
2204 int ret;
2205
2206 work = kzalloc(sizeof *work, GFP_KERNEL);
2207 if (!work)
2208 return -ENOMEM;
2209
2210 work->id = id_priv;
2211 INIT_WORK(&work->work, cma_work_handler);
2212 work->old_state = RDMA_CM_ROUTE_QUERY;
2213 work->new_state = RDMA_CM_ROUTE_RESOLVED;
2214 work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
2215
2216 route->path_rec = kmalloc(sizeof *route->path_rec, GFP_KERNEL);
2217 if (!route->path_rec) {
2218 ret = -ENOMEM;
2219 goto err1;
2220 }
2221
2222 ret = cma_query_ib_route(id_priv, timeout_ms, work);
2223 if (ret)
2224 goto err2;
2225
2226 return 0;
2227 err2:
2228 kfree(route->path_rec);
2229 route->path_rec = NULL;
2230 err1:
2231 kfree(work);
2232 return ret;
2233 }
2234
2235 int rdma_set_ib_paths(struct rdma_cm_id *id,
2236 struct ib_sa_path_rec *path_rec, int num_paths)
2237 {
2238 struct rdma_id_private *id_priv;
2239 int ret;
2240
2241 id_priv = container_of(id, struct rdma_id_private, id);
2242 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED,
2243 RDMA_CM_ROUTE_RESOLVED))
2244 return -EINVAL;
2245
2246 id->route.path_rec = kmemdup(path_rec, sizeof *path_rec * num_paths,
2247 GFP_KERNEL);
2248 if (!id->route.path_rec) {
2249 ret = -ENOMEM;
2250 goto err;
2251 }
2252
2253 id->route.num_paths = num_paths;
2254 return 0;
2255 err:
2256 cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_ADDR_RESOLVED);
2257 return ret;
2258 }
2259 EXPORT_SYMBOL(rdma_set_ib_paths);
2260
2261 static int cma_resolve_iw_route(struct rdma_id_private *id_priv, int timeout_ms)
2262 {
2263 struct cma_work *work;
2264
2265 work = kzalloc(sizeof *work, GFP_KERNEL);
2266 if (!work)
2267 return -ENOMEM;
2268
2269 work->id = id_priv;
2270 INIT_WORK(&work->work, cma_work_handler);
2271 work->old_state = RDMA_CM_ROUTE_QUERY;
2272 work->new_state = RDMA_CM_ROUTE_RESOLVED;
2273 work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
2274 queue_work(cma_wq, &work->work);
2275 return 0;
2276 }
2277
2278 static int iboe_tos_to_sl(struct net_device *ndev, int tos)
2279 {
2280 int prio;
2281 struct net_device *dev;
2282
2283 prio = rt_tos2priority(tos);
2284 dev = ndev->priv_flags & IFF_802_1Q_VLAN ?
2285 vlan_dev_real_dev(ndev) : ndev;
2286
2287 if (dev->num_tc)
2288 return netdev_get_prio_tc_map(dev, prio);
2289
2290 #if IS_ENABLED(CONFIG_VLAN_8021Q)
2291 if (ndev->priv_flags & IFF_802_1Q_VLAN)
2292 return (vlan_dev_get_egress_qos_mask(ndev, prio) &
2293 VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
2294 #endif
2295 return 0;
2296 }
2297
2298 static int cma_resolve_iboe_route(struct rdma_id_private *id_priv)
2299 {
2300 struct rdma_route *route = &id_priv->id.route;
2301 struct rdma_addr *addr = &route->addr;
2302 struct cma_work *work;
2303 int ret;
2304 struct net_device *ndev = NULL;
2305
2306
2307 work = kzalloc(sizeof *work, GFP_KERNEL);
2308 if (!work)
2309 return -ENOMEM;
2310
2311 work->id = id_priv;
2312 INIT_WORK(&work->work, cma_work_handler);
2313
2314 route->path_rec = kzalloc(sizeof *route->path_rec, GFP_KERNEL);
2315 if (!route->path_rec) {
2316 ret = -ENOMEM;
2317 goto err1;
2318 }
2319
2320 route->num_paths = 1;
2321
2322 if (addr->dev_addr.bound_dev_if) {
2323 ndev = dev_get_by_index(&init_net, addr->dev_addr.bound_dev_if);
2324 route->path_rec->net = &init_net;
2325 route->path_rec->ifindex = addr->dev_addr.bound_dev_if;
2326 }
2327 if (!ndev) {
2328 ret = -ENODEV;
2329 goto err2;
2330 }
2331
2332 memcpy(route->path_rec->dmac, addr->dev_addr.dst_dev_addr, ETH_ALEN);
2333
2334 rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
2335 &route->path_rec->sgid);
2336 rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.dst_addr,
2337 &route->path_rec->dgid);
2338
2339 route->path_rec->hop_limit = 1;
2340 route->path_rec->reversible = 1;
2341 route->path_rec->pkey = cpu_to_be16(0xffff);
2342 route->path_rec->mtu_selector = IB_SA_EQ;
2343 route->path_rec->sl = iboe_tos_to_sl(ndev, id_priv->tos);
2344 route->path_rec->mtu = iboe_get_mtu(ndev->mtu);
2345 route->path_rec->rate_selector = IB_SA_EQ;
2346 route->path_rec->rate = iboe_get_rate(ndev);
2347 dev_put(ndev);
2348 route->path_rec->packet_life_time_selector = IB_SA_EQ;
2349 route->path_rec->packet_life_time = CMA_IBOE_PACKET_LIFETIME;
2350 if (!route->path_rec->mtu) {
2351 ret = -EINVAL;
2352 goto err2;
2353 }
2354
2355 work->old_state = RDMA_CM_ROUTE_QUERY;
2356 work->new_state = RDMA_CM_ROUTE_RESOLVED;
2357 work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
2358 work->event.status = 0;
2359
2360 queue_work(cma_wq, &work->work);
2361
2362 return 0;
2363
2364 err2:
2365 kfree(route->path_rec);
2366 route->path_rec = NULL;
2367 err1:
2368 kfree(work);
2369 return ret;
2370 }
2371
2372 int rdma_resolve_route(struct rdma_cm_id *id, int timeout_ms)
2373 {
2374 struct rdma_id_private *id_priv;
2375 int ret;
2376
2377 id_priv = container_of(id, struct rdma_id_private, id);
2378 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED, RDMA_CM_ROUTE_QUERY))
2379 return -EINVAL;
2380
2381 atomic_inc(&id_priv->refcount);
2382 if (rdma_cap_ib_sa(id->device, id->port_num))
2383 ret = cma_resolve_ib_route(id_priv, timeout_ms);
2384 else if (rdma_protocol_roce(id->device, id->port_num))
2385 ret = cma_resolve_iboe_route(id_priv);
2386 else if (rdma_protocol_iwarp(id->device, id->port_num))
2387 ret = cma_resolve_iw_route(id_priv, timeout_ms);
2388 else
2389 ret = -ENOSYS;
2390
2391 if (ret)
2392 goto err;
2393
2394 return 0;
2395 err:
2396 cma_comp_exch(id_priv, RDMA_CM_ROUTE_QUERY, RDMA_CM_ADDR_RESOLVED);
2397 cma_deref_id(id_priv);
2398 return ret;
2399 }
2400 EXPORT_SYMBOL(rdma_resolve_route);
2401
2402 static void cma_set_loopback(struct sockaddr *addr)
2403 {
2404 switch (addr->sa_family) {
2405 case AF_INET:
2406 ((struct sockaddr_in *) addr)->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
2407 break;
2408 case AF_INET6:
2409 ipv6_addr_set(&((struct sockaddr_in6 *) addr)->sin6_addr,
2410 0, 0, 0, htonl(1));
2411 break;
2412 default:
2413 ib_addr_set(&((struct sockaddr_ib *) addr)->sib_addr,
2414 0, 0, 0, htonl(1));
2415 break;
2416 }
2417 }
2418
2419 static int cma_bind_loopback(struct rdma_id_private *id_priv)
2420 {
2421 struct cma_device *cma_dev, *cur_dev;
2422 struct ib_port_attr port_attr;
2423 union ib_gid gid;
2424 u16 pkey;
2425 int ret;
2426 u8 p;
2427
2428 cma_dev = NULL;
2429 mutex_lock(&lock);
2430 list_for_each_entry(cur_dev, &dev_list, list) {
2431 if (cma_family(id_priv) == AF_IB &&
2432 !rdma_cap_ib_cm(cur_dev->device, 1))
2433 continue;
2434
2435 if (!cma_dev)
2436 cma_dev = cur_dev;
2437
2438 for (p = 1; p <= cur_dev->device->phys_port_cnt; ++p) {
2439 if (!ib_query_port(cur_dev->device, p, &port_attr) &&
2440 port_attr.state == IB_PORT_ACTIVE) {
2441 cma_dev = cur_dev;
2442 goto port_found;
2443 }
2444 }
2445 }
2446
2447 if (!cma_dev) {
2448 ret = -ENODEV;
2449 goto out;
2450 }
2451
2452 p = 1;
2453
2454 port_found:
2455 ret = ib_get_cached_gid(cma_dev->device, p, 0, &gid, NULL);
2456 if (ret)
2457 goto out;
2458
2459 ret = ib_get_cached_pkey(cma_dev->device, p, 0, &pkey);
2460 if (ret)
2461 goto out;
2462
2463 id_priv->id.route.addr.dev_addr.dev_type =
2464 (rdma_protocol_ib(cma_dev->device, p)) ?
2465 ARPHRD_INFINIBAND : ARPHRD_ETHER;
2466
2467 rdma_addr_set_sgid(&id_priv->id.route.addr.dev_addr, &gid);
2468 ib_addr_set_pkey(&id_priv->id.route.addr.dev_addr, pkey);
2469 id_priv->id.port_num = p;
2470 cma_attach_to_dev(id_priv, cma_dev);
2471 cma_set_loopback(cma_src_addr(id_priv));
2472 out:
2473 mutex_unlock(&lock);
2474 return ret;
2475 }
2476
2477 static void addr_handler(int status, struct sockaddr *src_addr,
2478 struct rdma_dev_addr *dev_addr, void *context)
2479 {
2480 struct rdma_id_private *id_priv = context;
2481 struct rdma_cm_event event;
2482
2483 memset(&event, 0, sizeof event);
2484 mutex_lock(&id_priv->handler_mutex);
2485 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY,
2486 RDMA_CM_ADDR_RESOLVED))
2487 goto out;
2488
2489 memcpy(cma_src_addr(id_priv), src_addr, rdma_addr_size(src_addr));
2490 if (!status && !id_priv->cma_dev)
2491 status = cma_acquire_dev(id_priv, NULL);
2492
2493 if (status) {
2494 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED,
2495 RDMA_CM_ADDR_BOUND))
2496 goto out;
2497 event.event = RDMA_CM_EVENT_ADDR_ERROR;
2498 event.status = status;
2499 } else
2500 event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
2501
2502 if (id_priv->id.event_handler(&id_priv->id, &event)) {
2503 cma_exch(id_priv, RDMA_CM_DESTROYING);
2504 mutex_unlock(&id_priv->handler_mutex);
2505 cma_deref_id(id_priv);
2506 rdma_destroy_id(&id_priv->id);
2507 return;
2508 }
2509 out:
2510 mutex_unlock(&id_priv->handler_mutex);
2511 cma_deref_id(id_priv);
2512 }
2513
2514 static int cma_resolve_loopback(struct rdma_id_private *id_priv)
2515 {
2516 struct cma_work *work;
2517 union ib_gid gid;
2518 int ret;
2519
2520 work = kzalloc(sizeof *work, GFP_KERNEL);
2521 if (!work)
2522 return -ENOMEM;
2523
2524 if (!id_priv->cma_dev) {
2525 ret = cma_bind_loopback(id_priv);
2526 if (ret)
2527 goto err;
2528 }
2529
2530 rdma_addr_get_sgid(&id_priv->id.route.addr.dev_addr, &gid);
2531 rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, &gid);
2532
2533 work->id = id_priv;
2534 INIT_WORK(&work->work, cma_work_handler);
2535 work->old_state = RDMA_CM_ADDR_QUERY;
2536 work->new_state = RDMA_CM_ADDR_RESOLVED;
2537 work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
2538 queue_work(cma_wq, &work->work);
2539 return 0;
2540 err:
2541 kfree(work);
2542 return ret;
2543 }
2544
2545 static int cma_resolve_ib_addr(struct rdma_id_private *id_priv)
2546 {
2547 struct cma_work *work;
2548 int ret;
2549
2550 work = kzalloc(sizeof *work, GFP_KERNEL);
2551 if (!work)
2552 return -ENOMEM;
2553
2554 if (!id_priv->cma_dev) {
2555 ret = cma_resolve_ib_dev(id_priv);
2556 if (ret)
2557 goto err;
2558 }
2559
2560 rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, (union ib_gid *)
2561 &(((struct sockaddr_ib *) &id_priv->id.route.addr.dst_addr)->sib_addr));
2562
2563 work->id = id_priv;
2564 INIT_WORK(&work->work, cma_work_handler);
2565 work->old_state = RDMA_CM_ADDR_QUERY;
2566 work->new_state = RDMA_CM_ADDR_RESOLVED;
2567 work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
2568 queue_work(cma_wq, &work->work);
2569 return 0;
2570 err:
2571 kfree(work);
2572 return ret;
2573 }
2574
2575 static int cma_bind_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
2576 struct sockaddr *dst_addr)
2577 {
2578 if (!src_addr || !src_addr->sa_family) {
2579 src_addr = (struct sockaddr *) &id->route.addr.src_addr;
2580 src_addr->sa_family = dst_addr->sa_family;
2581 if (dst_addr->sa_family == AF_INET6) {
2582 struct sockaddr_in6 *src_addr6 = (struct sockaddr_in6 *) src_addr;
2583 struct sockaddr_in6 *dst_addr6 = (struct sockaddr_in6 *) dst_addr;
2584 src_addr6->sin6_scope_id = dst_addr6->sin6_scope_id;
2585 if (ipv6_addr_type(&dst_addr6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
2586 id->route.addr.dev_addr.bound_dev_if = dst_addr6->sin6_scope_id;
2587 } else if (dst_addr->sa_family == AF_IB) {
2588 ((struct sockaddr_ib *) src_addr)->sib_pkey =
2589 ((struct sockaddr_ib *) dst_addr)->sib_pkey;
2590 }
2591 }
2592 return rdma_bind_addr(id, src_addr);
2593 }
2594
2595 int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
2596 struct sockaddr *dst_addr, int timeout_ms)
2597 {
2598 struct rdma_id_private *id_priv;
2599 int ret;
2600
2601 id_priv = container_of(id, struct rdma_id_private, id);
2602 if (id_priv->state == RDMA_CM_IDLE) {
2603 ret = cma_bind_addr(id, src_addr, dst_addr);
2604 if (ret)
2605 return ret;
2606 }
2607
2608 if (cma_family(id_priv) != dst_addr->sa_family)
2609 return -EINVAL;
2610
2611 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_ADDR_QUERY))
2612 return -EINVAL;
2613
2614 atomic_inc(&id_priv->refcount);
2615 memcpy(cma_dst_addr(id_priv), dst_addr, rdma_addr_size(dst_addr));
2616 if (cma_any_addr(dst_addr)) {
2617 ret = cma_resolve_loopback(id_priv);
2618 } else {
2619 if (dst_addr->sa_family == AF_IB) {
2620 ret = cma_resolve_ib_addr(id_priv);
2621 } else {
2622 ret = rdma_resolve_ip(&addr_client, cma_src_addr(id_priv),
2623 dst_addr, &id->route.addr.dev_addr,
2624 timeout_ms, addr_handler, id_priv);
2625 }
2626 }
2627 if (ret)
2628 goto err;
2629
2630 return 0;
2631 err:
2632 cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY, RDMA_CM_ADDR_BOUND);
2633 cma_deref_id(id_priv);
2634 return ret;
2635 }
2636 EXPORT_SYMBOL(rdma_resolve_addr);
2637
2638 int rdma_set_reuseaddr(struct rdma_cm_id *id, int reuse)
2639 {
2640 struct rdma_id_private *id_priv;
2641 unsigned long flags;
2642 int ret;
2643
2644 id_priv = container_of(id, struct rdma_id_private, id);
2645 spin_lock_irqsave(&id_priv->lock, flags);
2646 if (reuse || id_priv->state == RDMA_CM_IDLE) {
2647 id_priv->reuseaddr = reuse;
2648 ret = 0;
2649 } else {
2650 ret = -EINVAL;
2651 }
2652 spin_unlock_irqrestore(&id_priv->lock, flags);
2653 return ret;
2654 }
2655 EXPORT_SYMBOL(rdma_set_reuseaddr);
2656
2657 int rdma_set_afonly(struct rdma_cm_id *id, int afonly)
2658 {
2659 struct rdma_id_private *id_priv;
2660 unsigned long flags;
2661 int ret;
2662
2663 id_priv = container_of(id, struct rdma_id_private, id);
2664 spin_lock_irqsave(&id_priv->lock, flags);
2665 if (id_priv->state == RDMA_CM_IDLE || id_priv->state == RDMA_CM_ADDR_BOUND) {
2666 id_priv->options |= (1 << CMA_OPTION_AFONLY);
2667 id_priv->afonly = afonly;
2668 ret = 0;
2669 } else {
2670 ret = -EINVAL;
2671 }
2672 spin_unlock_irqrestore(&id_priv->lock, flags);
2673 return ret;
2674 }
2675 EXPORT_SYMBOL(rdma_set_afonly);
2676
2677 static void cma_bind_port(struct rdma_bind_list *bind_list,
2678 struct rdma_id_private *id_priv)
2679 {
2680 struct sockaddr *addr;
2681 struct sockaddr_ib *sib;
2682 u64 sid, mask;
2683 __be16 port;
2684
2685 addr = cma_src_addr(id_priv);
2686 port = htons(bind_list->port);
2687
2688 switch (addr->sa_family) {
2689 case AF_INET:
2690 ((struct sockaddr_in *) addr)->sin_port = port;
2691 break;
2692 case AF_INET6:
2693 ((struct sockaddr_in6 *) addr)->sin6_port = port;
2694 break;
2695 case AF_IB:
2696 sib = (struct sockaddr_ib *) addr;
2697 sid = be64_to_cpu(sib->sib_sid);
2698 mask = be64_to_cpu(sib->sib_sid_mask);
2699 sib->sib_sid = cpu_to_be64((sid & mask) | (u64) ntohs(port));
2700 sib->sib_sid_mask = cpu_to_be64(~0ULL);
2701 break;
2702 }
2703 id_priv->bind_list = bind_list;
2704 hlist_add_head(&id_priv->node, &bind_list->owners);
2705 }
2706
2707 static int cma_alloc_port(enum rdma_port_space ps,
2708 struct rdma_id_private *id_priv, unsigned short snum)
2709 {
2710 struct rdma_bind_list *bind_list;
2711 int ret;
2712
2713 bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL);
2714 if (!bind_list)
2715 return -ENOMEM;
2716
2717 ret = cma_ps_alloc(id_priv->id.route.addr.dev_addr.net, ps, bind_list,
2718 snum);
2719 if (ret < 0)
2720 goto err;
2721
2722 bind_list->ps = ps;
2723 bind_list->port = (unsigned short)ret;
2724 cma_bind_port(bind_list, id_priv);
2725 return 0;
2726 err:
2727 kfree(bind_list);
2728 return ret == -ENOSPC ? -EADDRNOTAVAIL : ret;
2729 }
2730
2731 static int cma_alloc_any_port(enum rdma_port_space ps,
2732 struct rdma_id_private *id_priv)
2733 {
2734 static unsigned int last_used_port;
2735 int low, high, remaining;
2736 unsigned int rover;
2737 struct net *net = id_priv->id.route.addr.dev_addr.net;
2738
2739 inet_get_local_port_range(net, &low, &high);
2740 remaining = (high - low) + 1;
2741 rover = prandom_u32() % remaining + low;
2742 retry:
2743 if (last_used_port != rover &&
2744 !cma_ps_find(net, ps, (unsigned short)rover)) {
2745 int ret = cma_alloc_port(ps, id_priv, rover);
2746 /*
2747 * Remember previously used port number in order to avoid
2748 * re-using same port immediately after it is closed.
2749 */
2750 if (!ret)
2751 last_used_port = rover;
2752 if (ret != -EADDRNOTAVAIL)
2753 return ret;
2754 }
2755 if (--remaining) {
2756 rover++;
2757 if ((rover < low) || (rover > high))
2758 rover = low;
2759 goto retry;
2760 }
2761 return -EADDRNOTAVAIL;
2762 }
2763
2764 /*
2765 * Check that the requested port is available. This is called when trying to
2766 * bind to a specific port, or when trying to listen on a bound port. In
2767 * the latter case, the provided id_priv may already be on the bind_list, but
2768 * we still need to check that it's okay to start listening.
2769 */
2770 static int cma_check_port(struct rdma_bind_list *bind_list,
2771 struct rdma_id_private *id_priv, uint8_t reuseaddr)
2772 {
2773 struct rdma_id_private *cur_id;
2774 struct sockaddr *addr, *cur_addr;
2775
2776 addr = cma_src_addr(id_priv);
2777 hlist_for_each_entry(cur_id, &bind_list->owners, node) {
2778 if (id_priv == cur_id)
2779 continue;
2780
2781 if ((cur_id->state != RDMA_CM_LISTEN) && reuseaddr &&
2782 cur_id->reuseaddr)
2783 continue;
2784
2785 cur_addr = cma_src_addr(cur_id);
2786 if (id_priv->afonly && cur_id->afonly &&
2787 (addr->sa_family != cur_addr->sa_family))
2788 continue;
2789
2790 if (cma_any_addr(addr) || cma_any_addr(cur_addr))
2791 return -EADDRNOTAVAIL;
2792
2793 if (!cma_addr_cmp(addr, cur_addr))
2794 return -EADDRINUSE;
2795 }
2796 return 0;
2797 }
2798
2799 static int cma_use_port(enum rdma_port_space ps,
2800 struct rdma_id_private *id_priv)
2801 {
2802 struct rdma_bind_list *bind_list;
2803 unsigned short snum;
2804 int ret;
2805
2806 snum = ntohs(cma_port(cma_src_addr(id_priv)));
2807 if (snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
2808 return -EACCES;
2809
2810 bind_list = cma_ps_find(id_priv->id.route.addr.dev_addr.net, ps, snum);
2811 if (!bind_list) {
2812 ret = cma_alloc_port(ps, id_priv, snum);
2813 } else {
2814 ret = cma_check_port(bind_list, id_priv, id_priv->reuseaddr);
2815 if (!ret)
2816 cma_bind_port(bind_list, id_priv);
2817 }
2818 return ret;
2819 }
2820
2821 static int cma_bind_listen(struct rdma_id_private *id_priv)
2822 {
2823 struct rdma_bind_list *bind_list = id_priv->bind_list;
2824 int ret = 0;
2825
2826 mutex_lock(&lock);
2827 if (bind_list->owners.first->next)
2828 ret = cma_check_port(bind_list, id_priv, 0);
2829 mutex_unlock(&lock);
2830 return ret;
2831 }
2832
2833 static enum rdma_port_space cma_select_inet_ps(
2834 struct rdma_id_private *id_priv)
2835 {
2836 switch (id_priv->id.ps) {
2837 case RDMA_PS_TCP:
2838 case RDMA_PS_UDP:
2839 case RDMA_PS_IPOIB:
2840 case RDMA_PS_IB:
2841 return id_priv->id.ps;
2842 default:
2843
2844 return 0;
2845 }
2846 }
2847
2848 static enum rdma_port_space cma_select_ib_ps(struct rdma_id_private *id_priv)
2849 {
2850 enum rdma_port_space ps = 0;
2851 struct sockaddr_ib *sib;
2852 u64 sid_ps, mask, sid;
2853
2854 sib = (struct sockaddr_ib *) cma_src_addr(id_priv);
2855 mask = be64_to_cpu(sib->sib_sid_mask) & RDMA_IB_IP_PS_MASK;
2856 sid = be64_to_cpu(sib->sib_sid) & mask;
2857
2858 if ((id_priv->id.ps == RDMA_PS_IB) && (sid == (RDMA_IB_IP_PS_IB & mask))) {
2859 sid_ps = RDMA_IB_IP_PS_IB;
2860 ps = RDMA_PS_IB;
2861 } else if (((id_priv->id.ps == RDMA_PS_IB) || (id_priv->id.ps == RDMA_PS_TCP)) &&
2862 (sid == (RDMA_IB_IP_PS_TCP & mask))) {
2863 sid_ps = RDMA_IB_IP_PS_TCP;
2864 ps = RDMA_PS_TCP;
2865 } else if (((id_priv->id.ps == RDMA_PS_IB) || (id_priv->id.ps == RDMA_PS_UDP)) &&
2866 (sid == (RDMA_IB_IP_PS_UDP & mask))) {
2867 sid_ps = RDMA_IB_IP_PS_UDP;
2868 ps = RDMA_PS_UDP;
2869 }
2870
2871 if (ps) {
2872 sib->sib_sid = cpu_to_be64(sid_ps | ntohs(cma_port((struct sockaddr *) sib)));
2873 sib->sib_sid_mask = cpu_to_be64(RDMA_IB_IP_PS_MASK |
2874 be64_to_cpu(sib->sib_sid_mask));
2875 }
2876 return ps;
2877 }
2878
2879 static int cma_get_port(struct rdma_id_private *id_priv)
2880 {
2881 enum rdma_port_space ps;
2882 int ret;
2883
2884 if (cma_family(id_priv) != AF_IB)
2885 ps = cma_select_inet_ps(id_priv);
2886 else
2887 ps = cma_select_ib_ps(id_priv);
2888 if (!ps)
2889 return -EPROTONOSUPPORT;
2890
2891 mutex_lock(&lock);
2892 if (cma_any_port(cma_src_addr(id_priv)))
2893 ret = cma_alloc_any_port(ps, id_priv);
2894 else
2895 ret = cma_use_port(ps, id_priv);
2896 mutex_unlock(&lock);
2897
2898 return ret;
2899 }
2900
2901 static int cma_check_linklocal(struct rdma_dev_addr *dev_addr,
2902 struct sockaddr *addr)
2903 {
2904 #if IS_ENABLED(CONFIG_IPV6)
2905 struct sockaddr_in6 *sin6;
2906
2907 if (addr->sa_family != AF_INET6)
2908 return 0;
2909
2910 sin6 = (struct sockaddr_in6 *) addr;
2911
2912 if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
2913 return 0;
2914
2915 if (!sin6->sin6_scope_id)
2916 return -EINVAL;
2917
2918 dev_addr->bound_dev_if = sin6->sin6_scope_id;
2919 #endif
2920 return 0;
2921 }
2922
2923 int rdma_listen(struct rdma_cm_id *id, int backlog)
2924 {
2925 struct rdma_id_private *id_priv;
2926 int ret;
2927
2928 id_priv = container_of(id, struct rdma_id_private, id);
2929 if (id_priv->state == RDMA_CM_IDLE) {
2930 id->route.addr.src_addr.ss_family = AF_INET;
2931 ret = rdma_bind_addr(id, cma_src_addr(id_priv));
2932 if (ret)
2933 return ret;
2934 }
2935
2936 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_LISTEN))
2937 return -EINVAL;
2938
2939 if (id_priv->reuseaddr) {
2940 ret = cma_bind_listen(id_priv);
2941 if (ret)
2942 goto err;
2943 }
2944
2945 id_priv->backlog = backlog;
2946 if (id->device) {
2947 if (rdma_cap_ib_cm(id->device, 1)) {
2948 ret = cma_ib_listen(id_priv);
2949 if (ret)
2950 goto err;
2951 } else if (rdma_cap_iw_cm(id->device, 1)) {
2952 ret = cma_iw_listen(id_priv, backlog);
2953 if (ret)
2954 goto err;
2955 } else {
2956 ret = -ENOSYS;
2957 goto err;
2958 }
2959 } else
2960 cma_listen_on_all(id_priv);
2961
2962 return 0;
2963 err:
2964 id_priv->backlog = 0;
2965 cma_comp_exch(id_priv, RDMA_CM_LISTEN, RDMA_CM_ADDR_BOUND);
2966 return ret;
2967 }
2968 EXPORT_SYMBOL(rdma_listen);
2969
2970 int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr)
2971 {
2972 struct rdma_id_private *id_priv;
2973 int ret;
2974
2975 if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6 &&
2976 addr->sa_family != AF_IB)
2977 return -EAFNOSUPPORT;
2978
2979 id_priv = container_of(id, struct rdma_id_private, id);
2980 if (!cma_comp_exch(id_priv, RDMA_CM_IDLE, RDMA_CM_ADDR_BOUND))
2981 return -EINVAL;
2982
2983 ret = cma_check_linklocal(&id->route.addr.dev_addr, addr);
2984 if (ret)
2985 goto err1;
2986
2987 memcpy(cma_src_addr(id_priv), addr, rdma_addr_size(addr));
2988 if (!cma_any_addr(addr)) {
2989 ret = cma_translate_addr(addr, &id->route.addr.dev_addr);
2990 if (ret)
2991 goto err1;
2992
2993 ret = cma_acquire_dev(id_priv, NULL);
2994 if (ret)
2995 goto err1;
2996 }
2997
2998 if (!(id_priv->options & (1 << CMA_OPTION_AFONLY))) {
2999 if (addr->sa_family == AF_INET)
3000 id_priv->afonly = 1;
3001 #if IS_ENABLED(CONFIG_IPV6)
3002 else if (addr->sa_family == AF_INET6) {
3003 struct net *net = id_priv->id.route.addr.dev_addr.net;
3004
3005 id_priv->afonly = net->ipv6.sysctl.bindv6only;
3006 }
3007 #endif
3008 }
3009 ret = cma_get_port(id_priv);
3010 if (ret)
3011 goto err2;
3012
3013 return 0;
3014 err2:
3015 if (id_priv->cma_dev)
3016 cma_release_dev(id_priv);
3017 err1:
3018 cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_IDLE);
3019 return ret;
3020 }
3021 EXPORT_SYMBOL(rdma_bind_addr);
3022
3023 static int cma_format_hdr(void *hdr, struct rdma_id_private *id_priv)
3024 {
3025 struct cma_hdr *cma_hdr;
3026
3027 cma_hdr = hdr;
3028 cma_hdr->cma_version = CMA_VERSION;
3029 if (cma_family(id_priv) == AF_INET) {
3030 struct sockaddr_in *src4, *dst4;
3031
3032 src4 = (struct sockaddr_in *) cma_src_addr(id_priv);
3033 dst4 = (struct sockaddr_in *) cma_dst_addr(id_priv);
3034
3035 cma_set_ip_ver(cma_hdr, 4);
3036 cma_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
3037 cma_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
3038 cma_hdr->port = src4->sin_port;
3039 } else if (cma_family(id_priv) == AF_INET6) {
3040 struct sockaddr_in6 *src6, *dst6;
3041
3042 src6 = (struct sockaddr_in6 *) cma_src_addr(id_priv);
3043 dst6 = (struct sockaddr_in6 *) cma_dst_addr(id_priv);
3044
3045 cma_set_ip_ver(cma_hdr, 6);
3046 cma_hdr->src_addr.ip6 = src6->sin6_addr;
3047 cma_hdr->dst_addr.ip6 = dst6->sin6_addr;
3048 cma_hdr->port = src6->sin6_port;
3049 }
3050 return 0;
3051 }
3052
3053 static int cma_sidr_rep_handler(struct ib_cm_id *cm_id,
3054 struct ib_cm_event *ib_event)
3055 {
3056 struct rdma_id_private *id_priv = cm_id->context;
3057 struct rdma_cm_event event;
3058 struct ib_cm_sidr_rep_event_param *rep = &ib_event->param.sidr_rep_rcvd;
3059 int ret = 0;
3060
3061 if (cma_disable_callback(id_priv, RDMA_CM_CONNECT))
3062 return 0;
3063
3064 memset(&event, 0, sizeof event);
3065 switch (ib_event->event) {
3066 case IB_CM_SIDR_REQ_ERROR:
3067 event.event = RDMA_CM_EVENT_UNREACHABLE;
3068 event.status = -ETIMEDOUT;
3069 break;
3070 case IB_CM_SIDR_REP_RECEIVED:
3071 event.param.ud.private_data = ib_event->private_data;
3072 event.param.ud.private_data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
3073 if (rep->status != IB_SIDR_SUCCESS) {
3074 event.event = RDMA_CM_EVENT_UNREACHABLE;
3075 event.status = ib_event->param.sidr_rep_rcvd.status;
3076 break;
3077 }
3078 ret = cma_set_qkey(id_priv, rep->qkey);
3079 if (ret) {
3080 event.event = RDMA_CM_EVENT_ADDR_ERROR;
3081 event.status = ret;
3082 break;
3083 }
3084 ib_init_ah_from_path(id_priv->id.device, id_priv->id.port_num,
3085 id_priv->id.route.path_rec,
3086 &event.param.ud.ah_attr);
3087 event.param.ud.qp_num = rep->qpn;
3088 event.param.ud.qkey = rep->qkey;
3089 event.event = RDMA_CM_EVENT_ESTABLISHED;
3090 event.status = 0;
3091 break;
3092 default:
3093 printk(KERN_ERR "RDMA CMA: unexpected IB CM event: %d\n",
3094 ib_event->event);
3095 goto out;
3096 }
3097
3098 ret = id_priv->id.event_handler(&id_priv->id, &event);
3099 if (ret) {
3100 /* Destroy the CM ID by returning a non-zero value. */
3101 id_priv->cm_id.ib = NULL;
3102 cma_exch(id_priv, RDMA_CM_DESTROYING);
3103 mutex_unlock(&id_priv->handler_mutex);
3104 rdma_destroy_id(&id_priv->id);
3105 return ret;
3106 }
3107 out:
3108 mutex_unlock(&id_priv->handler_mutex);
3109 return ret;
3110 }
3111
3112 static int cma_resolve_ib_udp(struct rdma_id_private *id_priv,
3113 struct rdma_conn_param *conn_param)
3114 {
3115 struct ib_cm_sidr_req_param req;
3116 struct ib_cm_id *id;
3117 void *private_data;
3118 int offset, ret;
3119
3120 memset(&req, 0, sizeof req);
3121 offset = cma_user_data_offset(id_priv);
3122 req.private_data_len = offset + conn_param->private_data_len;
3123 if (req.private_data_len < conn_param->private_data_len)
3124 return -EINVAL;
3125
3126 if (req.private_data_len) {
3127 private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
3128 if (!private_data)
3129 return -ENOMEM;
3130 } else {
3131 private_data = NULL;
3132 }
3133
3134 if (conn_param->private_data && conn_param->private_data_len)
3135 memcpy(private_data + offset, conn_param->private_data,
3136 conn_param->private_data_len);
3137
3138 if (private_data) {
3139 ret = cma_format_hdr(private_data, id_priv);
3140 if (ret)
3141 goto out;
3142 req.private_data = private_data;
3143 }
3144
3145 id = ib_create_cm_id(id_priv->id.device, cma_sidr_rep_handler,
3146 id_priv);
3147 if (IS_ERR(id)) {
3148 ret = PTR_ERR(id);
3149 goto out;
3150 }
3151 id_priv->cm_id.ib = id;
3152
3153 req.path = id_priv->id.route.path_rec;
3154 req.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
3155 req.timeout_ms = 1 << (CMA_CM_RESPONSE_TIMEOUT - 8);
3156 req.max_cm_retries = CMA_MAX_CM_RETRIES;
3157
3158 ret = ib_send_cm_sidr_req(id_priv->cm_id.ib, &req);
3159 if (ret) {
3160 ib_destroy_cm_id(id_priv->cm_id.ib);
3161 id_priv->cm_id.ib = NULL;
3162 }
3163 out:
3164 kfree(private_data);
3165 return ret;
3166 }
3167
3168 static int cma_connect_ib(struct rdma_id_private *id_priv,
3169 struct rdma_conn_param *conn_param)
3170 {
3171 struct ib_cm_req_param req;
3172 struct rdma_route *route;
3173 void *private_data;
3174 struct ib_cm_id *id;
3175 int offset, ret;
3176
3177 memset(&req, 0, sizeof req);
3178 offset = cma_user_data_offset(id_priv);
3179 req.private_data_len = offset + conn_param->private_data_len;
3180 if (req.private_data_len < conn_param->private_data_len)
3181 return -EINVAL;
3182
3183 if (req.private_data_len) {
3184 private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
3185 if (!private_data)
3186 return -ENOMEM;
3187 } else {
3188 private_data = NULL;
3189 }
3190
3191 if (conn_param->private_data && conn_param->private_data_len)
3192 memcpy(private_data + offset, conn_param->private_data,
3193 conn_param->private_data_len);
3194
3195 id = ib_create_cm_id(id_priv->id.device, cma_ib_handler, id_priv);
3196 if (IS_ERR(id)) {
3197 ret = PTR_ERR(id);
3198 goto out;
3199 }
3200 id_priv->cm_id.ib = id;
3201
3202 route = &id_priv->id.route;
3203 if (private_data) {
3204 ret = cma_format_hdr(private_data, id_priv);
3205 if (ret)
3206 goto out;
3207 req.private_data = private_data;
3208 }
3209
3210 req.primary_path = &route->path_rec[0];
3211 if (route->num_paths == 2)
3212 req.alternate_path = &route->path_rec[1];
3213
3214 req.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
3215 req.qp_num = id_priv->qp_num;
3216 req.qp_type = id_priv->id.qp_type;
3217 req.starting_psn = id_priv->seq_num;
3218 req.responder_resources = conn_param->responder_resources;
3219 req.initiator_depth = conn_param->initiator_depth;
3220 req.flow_control = conn_param->flow_control;
3221 req.retry_count = min_t(u8, 7, conn_param->retry_count);
3222 req.rnr_retry_count = min_t(u8, 7, conn_param->rnr_retry_count);
3223 req.remote_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
3224 req.local_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
3225 req.max_cm_retries = CMA_MAX_CM_RETRIES;
3226 req.srq = id_priv->srq ? 1 : 0;
3227
3228 ret = ib_send_cm_req(id_priv->cm_id.ib, &req);
3229 out:
3230 if (ret && !IS_ERR(id)) {
3231 ib_destroy_cm_id(id);
3232 id_priv->cm_id.ib = NULL;
3233 }
3234
3235 kfree(private_data);
3236 return ret;
3237 }
3238
3239 static int cma_connect_iw(struct rdma_id_private *id_priv,
3240 struct rdma_conn_param *conn_param)
3241 {
3242 struct iw_cm_id *cm_id;
3243 int ret;
3244 struct iw_cm_conn_param iw_param;
3245
3246 cm_id = iw_create_cm_id(id_priv->id.device, cma_iw_handler, id_priv);
3247 if (IS_ERR(cm_id))
3248 return PTR_ERR(cm_id);
3249
3250 cm_id->tos = id_priv->tos;
3251 id_priv->cm_id.iw = cm_id;
3252
3253 memcpy(&cm_id->local_addr, cma_src_addr(id_priv),
3254 rdma_addr_size(cma_src_addr(id_priv)));
3255 memcpy(&cm_id->remote_addr, cma_dst_addr(id_priv),
3256 rdma_addr_size(cma_dst_addr(id_priv)));
3257
3258 ret = cma_modify_qp_rtr(id_priv, conn_param);
3259 if (ret)
3260 goto out;
3261
3262 if (conn_param) {
3263 iw_param.ord = conn_param->initiator_depth;
3264 iw_param.ird = conn_param->responder_resources;
3265 iw_param.private_data = conn_param->private_data;
3266 iw_param.private_data_len = conn_param->private_data_len;
3267 iw_param.qpn = id_priv->id.qp ? id_priv->qp_num : conn_param->qp_num;
3268 } else {
3269 memset(&iw_param, 0, sizeof iw_param);
3270 iw_param.qpn = id_priv->qp_num;
3271 }
3272 ret = iw_cm_connect(cm_id, &iw_param);
3273 out:
3274 if (ret) {
3275 iw_destroy_cm_id(cm_id);
3276 id_priv->cm_id.iw = NULL;
3277 }
3278 return ret;
3279 }
3280
3281 int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
3282 {
3283 struct rdma_id_private *id_priv;
3284 int ret;
3285
3286 id_priv = container_of(id, struct rdma_id_private, id);
3287 if (!cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_CONNECT))
3288 return -EINVAL;
3289
3290 if (!id->qp) {
3291 id_priv->qp_num = conn_param->qp_num;
3292 id_priv->srq = conn_param->srq;
3293 }
3294
3295 if (rdma_cap_ib_cm(id->device, id->port_num)) {
3296 if (id->qp_type == IB_QPT_UD)
3297 ret = cma_resolve_ib_udp(id_priv, conn_param);
3298 else
3299 ret = cma_connect_ib(id_priv, conn_param);
3300 } else if (rdma_cap_iw_cm(id->device, id->port_num))
3301 ret = cma_connect_iw(id_priv, conn_param);
3302 else
3303 ret = -ENOSYS;
3304 if (ret)
3305 goto err;
3306
3307 return 0;
3308 err:
3309 cma_comp_exch(id_priv, RDMA_CM_CONNECT, RDMA_CM_ROUTE_RESOLVED);
3310 return ret;
3311 }
3312 EXPORT_SYMBOL(rdma_connect);
3313
3314 static int cma_accept_ib(struct rdma_id_private *id_priv,
3315 struct rdma_conn_param *conn_param)
3316 {
3317 struct ib_cm_rep_param rep;
3318 int ret;
3319
3320 ret = cma_modify_qp_rtr(id_priv, conn_param);
3321 if (ret)
3322 goto out;
3323
3324 ret = cma_modify_qp_rts(id_priv, conn_param);
3325 if (ret)
3326 goto out;
3327
3328 memset(&rep, 0, sizeof rep);
3329 rep.qp_num = id_priv->qp_num;
3330 rep.starting_psn = id_priv->seq_num;
3331 rep.private_data = conn_param->private_data;
3332 rep.private_data_len = conn_param->private_data_len;
3333 rep.responder_resources = conn_param->responder_resources;
3334 rep.initiator_depth = conn_param->initiator_depth;
3335 rep.failover_accepted = 0;
3336 rep.flow_control = conn_param->flow_control;
3337 rep.rnr_retry_count = min_t(u8, 7, conn_param->rnr_retry_count);
3338 rep.srq = id_priv->srq ? 1 : 0;
3339
3340 ret = ib_send_cm_rep(id_priv->cm_id.ib, &rep);
3341 out:
3342 return ret;
3343 }
3344
3345 static int cma_accept_iw(struct rdma_id_private *id_priv,
3346 struct rdma_conn_param *conn_param)
3347 {
3348 struct iw_cm_conn_param iw_param;
3349 int ret;
3350
3351 ret = cma_modify_qp_rtr(id_priv, conn_param);
3352 if (ret)
3353 return ret;
3354
3355 iw_param.ord = conn_param->initiator_depth;
3356 iw_param.ird = conn_param->responder_resources;
3357 iw_param.private_data = conn_param->private_data;
3358 iw_param.private_data_len = conn_param->private_data_len;
3359 if (id_priv->id.qp) {
3360 iw_param.qpn = id_priv->qp_num;
3361 } else
3362 iw_param.qpn = conn_param->qp_num;
3363
3364 return iw_cm_accept(id_priv->cm_id.iw, &iw_param);
3365 }
3366
3367 static int cma_send_sidr_rep(struct rdma_id_private *id_priv,
3368 enum ib_cm_sidr_status status, u32 qkey,
3369 const void *private_data, int private_data_len)
3370 {
3371 struct ib_cm_sidr_rep_param rep;
3372 int ret;
3373
3374 memset(&rep, 0, sizeof rep);
3375 rep.status = status;
3376 if (status == IB_SIDR_SUCCESS) {
3377 ret = cma_set_qkey(id_priv, qkey);
3378 if (ret)
3379 return ret;
3380 rep.qp_num = id_priv->qp_num;
3381 rep.qkey = id_priv->qkey;
3382 }
3383 rep.private_data = private_data;
3384 rep.private_data_len = private_data_len;
3385
3386 return ib_send_cm_sidr_rep(id_priv->cm_id.ib, &rep);
3387 }
3388
3389 int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
3390 {
3391 struct rdma_id_private *id_priv;
3392 int ret;
3393
3394 id_priv = container_of(id, struct rdma_id_private, id);
3395
3396 id_priv->owner = task_pid_nr(current);
3397
3398 if (!cma_comp(id_priv, RDMA_CM_CONNECT))
3399 return -EINVAL;
3400
3401 if (!id->qp && conn_param) {
3402 id_priv->qp_num = conn_param->qp_num;
3403 id_priv->srq = conn_param->srq;
3404 }
3405
3406 if (rdma_cap_ib_cm(id->device, id->port_num)) {
3407 if (id->qp_type == IB_QPT_UD) {
3408 if (conn_param)
3409 ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
3410 conn_param->qkey,
3411 conn_param->private_data,
3412 conn_param->private_data_len);
3413 else
3414 ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
3415 0, NULL, 0);
3416 } else {
3417 if (conn_param)
3418 ret = cma_accept_ib(id_priv, conn_param);
3419 else
3420 ret = cma_rep_recv(id_priv);
3421 }
3422 } else if (rdma_cap_iw_cm(id->device, id->port_num))
3423 ret = cma_accept_iw(id_priv, conn_param);
3424 else
3425 ret = -ENOSYS;
3426
3427 if (ret)
3428 goto reject;
3429
3430 return 0;
3431 reject:
3432 cma_modify_qp_err(id_priv);
3433 rdma_reject(id, NULL, 0);
3434 return ret;
3435 }
3436 EXPORT_SYMBOL(rdma_accept);
3437
3438 int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event)
3439 {
3440 struct rdma_id_private *id_priv;
3441 int ret;
3442
3443 id_priv = container_of(id, struct rdma_id_private, id);
3444 if (!id_priv->cm_id.ib)
3445 return -EINVAL;
3446
3447 switch (id->device->node_type) {
3448 case RDMA_NODE_IB_CA:
3449 ret = ib_cm_notify(id_priv->cm_id.ib, event);
3450 break;
3451 default:
3452 ret = 0;
3453 break;
3454 }
3455 return ret;
3456 }
3457 EXPORT_SYMBOL(rdma_notify);
3458
3459 int rdma_reject(struct rdma_cm_id *id, const void *private_data,
3460 u8 private_data_len)
3461 {
3462 struct rdma_id_private *id_priv;
3463 int ret;
3464
3465 id_priv = container_of(id, struct rdma_id_private, id);
3466 if (!id_priv->cm_id.ib)
3467 return -EINVAL;
3468
3469 if (rdma_cap_ib_cm(id->device, id->port_num)) {
3470 if (id->qp_type == IB_QPT_UD)
3471 ret = cma_send_sidr_rep(id_priv, IB_SIDR_REJECT, 0,
3472 private_data, private_data_len);
3473 else
3474 ret = ib_send_cm_rej(id_priv->cm_id.ib,
3475 IB_CM_REJ_CONSUMER_DEFINED, NULL,
3476 0, private_data, private_data_len);
3477 } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
3478 ret = iw_cm_reject(id_priv->cm_id.iw,
3479 private_data, private_data_len);
3480 } else
3481 ret = -ENOSYS;
3482
3483 return ret;
3484 }
3485 EXPORT_SYMBOL(rdma_reject);
3486
3487 int rdma_disconnect(struct rdma_cm_id *id)
3488 {
3489 struct rdma_id_private *id_priv;
3490 int ret;
3491
3492 id_priv = container_of(id, struct rdma_id_private, id);
3493 if (!id_priv->cm_id.ib)
3494 return -EINVAL;
3495
3496 if (rdma_cap_ib_cm(id->device, id->port_num)) {
3497 ret = cma_modify_qp_err(id_priv);
3498 if (ret)
3499 goto out;
3500 /* Initiate or respond to a disconnect. */
3501 if (ib_send_cm_dreq(id_priv->cm_id.ib, NULL, 0))
3502 ib_send_cm_drep(id_priv->cm_id.ib, NULL, 0);
3503 } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
3504 ret = iw_cm_disconnect(id_priv->cm_id.iw, 0);
3505 } else
3506 ret = -EINVAL;
3507
3508 out:
3509 return ret;
3510 }
3511 EXPORT_SYMBOL(rdma_disconnect);
3512
3513 static int cma_ib_mc_handler(int status, struct ib_sa_multicast *multicast)
3514 {
3515 struct rdma_id_private *id_priv;
3516 struct cma_multicast *mc = multicast->context;
3517 struct rdma_cm_event event;
3518 int ret;
3519
3520 id_priv = mc->id_priv;
3521 if (cma_disable_callback(id_priv, RDMA_CM_ADDR_BOUND) &&
3522 cma_disable_callback(id_priv, RDMA_CM_ADDR_RESOLVED))
3523 return 0;
3524
3525 if (!status)
3526 status = cma_set_qkey(id_priv, be32_to_cpu(multicast->rec.qkey));
3527 mutex_lock(&id_priv->qp_mutex);
3528 if (!status && id_priv->id.qp)
3529 status = ib_attach_mcast(id_priv->id.qp, &multicast->rec.mgid,
3530 be16_to_cpu(multicast->rec.mlid));
3531 mutex_unlock(&id_priv->qp_mutex);
3532
3533 memset(&event, 0, sizeof event);
3534 event.status = status;
3535 event.param.ud.private_data = mc->context;
3536 if (!status) {
3537 event.event = RDMA_CM_EVENT_MULTICAST_JOIN;
3538 ib_init_ah_from_mcmember(id_priv->id.device,
3539 id_priv->id.port_num, &multicast->rec,
3540 &event.param.ud.ah_attr);
3541 event.param.ud.qp_num = 0xFFFFFF;
3542 event.param.ud.qkey = be32_to_cpu(multicast->rec.qkey);
3543 } else
3544 event.event = RDMA_CM_EVENT_MULTICAST_ERROR;
3545
3546 ret = id_priv->id.event_handler(&id_priv->id, &event);
3547 if (ret) {
3548 cma_exch(id_priv, RDMA_CM_DESTROYING);
3549 mutex_unlock(&id_priv->handler_mutex);
3550 rdma_destroy_id(&id_priv->id);
3551 return 0;
3552 }
3553
3554 mutex_unlock(&id_priv->handler_mutex);
3555 return 0;
3556 }
3557
3558 static void cma_set_mgid(struct rdma_id_private *id_priv,
3559 struct sockaddr *addr, union ib_gid *mgid)
3560 {
3561 unsigned char mc_map[MAX_ADDR_LEN];
3562 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
3563 struct sockaddr_in *sin = (struct sockaddr_in *) addr;
3564 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) addr;
3565
3566 if (cma_any_addr(addr)) {
3567 memset(mgid, 0, sizeof *mgid);
3568 } else if ((addr->sa_family == AF_INET6) &&
3569 ((be32_to_cpu(sin6->sin6_addr.s6_addr32[0]) & 0xFFF0FFFF) ==
3570 0xFF10A01B)) {
3571 /* IPv6 address is an SA assigned MGID. */
3572 memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
3573 } else if (addr->sa_family == AF_IB) {
3574 memcpy(mgid, &((struct sockaddr_ib *) addr)->sib_addr, sizeof *mgid);
3575 } else if ((addr->sa_family == AF_INET6)) {
3576 ipv6_ib_mc_map(&sin6->sin6_addr, dev_addr->broadcast, mc_map);
3577 if (id_priv->id.ps == RDMA_PS_UDP)
3578 mc_map[7] = 0x01; /* Use RDMA CM signature */
3579 *mgid = *(union ib_gid *) (mc_map + 4);
3580 } else {
3581 ip_ib_mc_map(sin->sin_addr.s_addr, dev_addr->broadcast, mc_map);
3582 if (id_priv->id.ps == RDMA_PS_UDP)
3583 mc_map[7] = 0x01; /* Use RDMA CM signature */
3584 *mgid = *(union ib_gid *) (mc_map + 4);
3585 }
3586 }
3587
3588 static int cma_join_ib_multicast(struct rdma_id_private *id_priv,
3589 struct cma_multicast *mc)
3590 {
3591 struct ib_sa_mcmember_rec rec;
3592 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
3593 ib_sa_comp_mask comp_mask;
3594 int ret;
3595
3596 ib_addr_get_mgid(dev_addr, &rec.mgid);
3597 ret = ib_sa_get_mcmember_rec(id_priv->id.device, id_priv->id.port_num,
3598 &rec.mgid, &rec);
3599 if (ret)
3600 return ret;
3601
3602 ret = cma_set_qkey(id_priv, 0);
3603 if (ret)
3604 return ret;
3605
3606 cma_set_mgid(id_priv, (struct sockaddr *) &mc->addr, &rec.mgid);
3607 rec.qkey = cpu_to_be32(id_priv->qkey);
3608 rdma_addr_get_sgid(dev_addr, &rec.port_gid);
3609 rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
3610 rec.join_state = 1;
3611
3612 comp_mask = IB_SA_MCMEMBER_REC_MGID | IB_SA_MCMEMBER_REC_PORT_GID |
3613 IB_SA_MCMEMBER_REC_PKEY | IB_SA_MCMEMBER_REC_JOIN_STATE |
3614 IB_SA_MCMEMBER_REC_QKEY | IB_SA_MCMEMBER_REC_SL |
3615 IB_SA_MCMEMBER_REC_FLOW_LABEL |
3616 IB_SA_MCMEMBER_REC_TRAFFIC_CLASS;
3617
3618 if (id_priv->id.ps == RDMA_PS_IPOIB)
3619 comp_mask |= IB_SA_MCMEMBER_REC_RATE |
3620 IB_SA_MCMEMBER_REC_RATE_SELECTOR |
3621 IB_SA_MCMEMBER_REC_MTU_SELECTOR |
3622 IB_SA_MCMEMBER_REC_MTU |
3623 IB_SA_MCMEMBER_REC_HOP_LIMIT;
3624
3625 mc->multicast.ib = ib_sa_join_multicast(&sa_client, id_priv->id.device,
3626 id_priv->id.port_num, &rec,
3627 comp_mask, GFP_KERNEL,
3628 cma_ib_mc_handler, mc);
3629 return PTR_ERR_OR_ZERO(mc->multicast.ib);
3630 }
3631
3632 static void iboe_mcast_work_handler(struct work_struct *work)
3633 {
3634 struct iboe_mcast_work *mw = container_of(work, struct iboe_mcast_work, work);
3635 struct cma_multicast *mc = mw->mc;
3636 struct ib_sa_multicast *m = mc->multicast.ib;
3637
3638 mc->multicast.ib->context = mc;
3639 cma_ib_mc_handler(0, m);
3640 kref_put(&mc->mcref, release_mc);
3641 kfree(mw);
3642 }
3643
3644 static void cma_iboe_set_mgid(struct sockaddr *addr, union ib_gid *mgid)
3645 {
3646 struct sockaddr_in *sin = (struct sockaddr_in *)addr;
3647 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr;
3648
3649 if (cma_any_addr(addr)) {
3650 memset(mgid, 0, sizeof *mgid);
3651 } else if (addr->sa_family == AF_INET6) {
3652 memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
3653 } else {
3654 mgid->raw[0] = 0xff;
3655 mgid->raw[1] = 0x0e;
3656 mgid->raw[2] = 0;
3657 mgid->raw[3] = 0;
3658 mgid->raw[4] = 0;
3659 mgid->raw[5] = 0;
3660 mgid->raw[6] = 0;
3661 mgid->raw[7] = 0;
3662 mgid->raw[8] = 0;
3663 mgid->raw[9] = 0;
3664 mgid->raw[10] = 0xff;
3665 mgid->raw[11] = 0xff;
3666 *(__be32 *)(&mgid->raw[12]) = sin->sin_addr.s_addr;
3667 }
3668 }
3669
3670 static int cma_iboe_join_multicast(struct rdma_id_private *id_priv,
3671 struct cma_multicast *mc)
3672 {
3673 struct iboe_mcast_work *work;
3674 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
3675 int err;
3676 struct sockaddr *addr = (struct sockaddr *)&mc->addr;
3677 struct net_device *ndev = NULL;
3678
3679 if (cma_zero_addr((struct sockaddr *)&mc->addr))
3680 return -EINVAL;
3681
3682 work = kzalloc(sizeof *work, GFP_KERNEL);
3683 if (!work)
3684 return -ENOMEM;
3685
3686 mc->multicast.ib = kzalloc(sizeof(struct ib_sa_multicast), GFP_KERNEL);
3687 if (!mc->multicast.ib) {
3688 err = -ENOMEM;
3689 goto out1;
3690 }
3691
3692 cma_iboe_set_mgid(addr, &mc->multicast.ib->rec.mgid);
3693
3694 mc->multicast.ib->rec.pkey = cpu_to_be16(0xffff);
3695 if (id_priv->id.ps == RDMA_PS_UDP)
3696 mc->multicast.ib->rec.qkey = cpu_to_be32(RDMA_UDP_QKEY);
3697
3698 if (dev_addr->bound_dev_if)
3699 ndev = dev_get_by_index(&init_net, dev_addr->bound_dev_if);
3700 if (!ndev) {
3701 err = -ENODEV;
3702 goto out2;
3703 }
3704 mc->multicast.ib->rec.rate = iboe_get_rate(ndev);
3705 mc->multicast.ib->rec.hop_limit = 1;
3706 mc->multicast.ib->rec.mtu = iboe_get_mtu(ndev->mtu);
3707 dev_put(ndev);
3708 if (!mc->multicast.ib->rec.mtu) {
3709 err = -EINVAL;
3710 goto out2;
3711 }
3712 rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
3713 &mc->multicast.ib->rec.port_gid);
3714 work->id = id_priv;
3715 work->mc = mc;
3716 INIT_WORK(&work->work, iboe_mcast_work_handler);
3717 kref_get(&mc->mcref);
3718 queue_work(cma_wq, &work->work);
3719
3720 return 0;
3721
3722 out2:
3723 kfree(mc->multicast.ib);
3724 out1:
3725 kfree(work);
3726 return err;
3727 }
3728
3729 int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
3730 void *context)
3731 {
3732 struct rdma_id_private *id_priv;
3733 struct cma_multicast *mc;
3734 int ret;
3735
3736 id_priv = container_of(id, struct rdma_id_private, id);
3737 if (!cma_comp(id_priv, RDMA_CM_ADDR_BOUND) &&
3738 !cma_comp(id_priv, RDMA_CM_ADDR_RESOLVED))
3739 return -EINVAL;
3740
3741 mc = kmalloc(sizeof *mc, GFP_KERNEL);
3742 if (!mc)
3743 return -ENOMEM;
3744
3745 memcpy(&mc->addr, addr, rdma_addr_size(addr));
3746 mc->context = context;
3747 mc->id_priv = id_priv;
3748
3749 spin_lock(&id_priv->lock);
3750 list_add(&mc->list, &id_priv->mc_list);
3751 spin_unlock(&id_priv->lock);
3752
3753 if (rdma_protocol_roce(id->device, id->port_num)) {
3754 kref_init(&mc->mcref);
3755 ret = cma_iboe_join_multicast(id_priv, mc);
3756 } else if (rdma_cap_ib_mcast(id->device, id->port_num))
3757 ret = cma_join_ib_multicast(id_priv, mc);
3758 else
3759 ret = -ENOSYS;
3760
3761 if (ret) {
3762 spin_lock_irq(&id_priv->lock);
3763 list_del(&mc->list);
3764 spin_unlock_irq(&id_priv->lock);
3765 kfree(mc);
3766 }
3767 return ret;
3768 }
3769 EXPORT_SYMBOL(rdma_join_multicast);
3770
3771 void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr)
3772 {
3773 struct rdma_id_private *id_priv;
3774 struct cma_multicast *mc;
3775
3776 id_priv = container_of(id, struct rdma_id_private, id);
3777 spin_lock_irq(&id_priv->lock);
3778 list_for_each_entry(mc, &id_priv->mc_list, list) {
3779 if (!memcmp(&mc->addr, addr, rdma_addr_size(addr))) {
3780 list_del(&mc->list);
3781 spin_unlock_irq(&id_priv->lock);
3782
3783 if (id->qp)
3784 ib_detach_mcast(id->qp,
3785 &mc->multicast.ib->rec.mgid,
3786 be16_to_cpu(mc->multicast.ib->rec.mlid));
3787
3788 BUG_ON(id_priv->cma_dev->device != id->device);
3789
3790 if (rdma_cap_ib_mcast(id->device, id->port_num)) {
3791 ib_sa_free_multicast(mc->multicast.ib);
3792 kfree(mc);
3793 } else if (rdma_protocol_roce(id->device, id->port_num))
3794 kref_put(&mc->mcref, release_mc);
3795
3796 return;
3797 }
3798 }
3799 spin_unlock_irq(&id_priv->lock);
3800 }
3801 EXPORT_SYMBOL(rdma_leave_multicast);
3802
3803 static int cma_netdev_change(struct net_device *ndev, struct rdma_id_private *id_priv)
3804 {
3805 struct rdma_dev_addr *dev_addr;
3806 struct cma_ndev_work *work;
3807
3808 dev_addr = &id_priv->id.route.addr.dev_addr;
3809
3810 if ((dev_addr->bound_dev_if == ndev->ifindex) &&
3811 (net_eq(dev_net(ndev), dev_addr->net)) &&
3812 memcmp(dev_addr->src_dev_addr, ndev->dev_addr, ndev->addr_len)) {
3813 printk(KERN_INFO "RDMA CM addr change for ndev %s used by id %p\n",
3814 ndev->name, &id_priv->id);
3815 work = kzalloc(sizeof *work, GFP_KERNEL);
3816 if (!work)
3817 return -ENOMEM;
3818
3819 INIT_WORK(&work->work, cma_ndev_work_handler);
3820 work->id = id_priv;
3821 work->event.event = RDMA_CM_EVENT_ADDR_CHANGE;
3822 atomic_inc(&id_priv->refcount);
3823 queue_work(cma_wq, &work->work);
3824 }
3825
3826 return 0;
3827 }
3828
3829 static int cma_netdev_callback(struct notifier_block *self, unsigned long event,
3830 void *ptr)
3831 {
3832 struct net_device *ndev = netdev_notifier_info_to_dev(ptr);
3833 struct cma_device *cma_dev;
3834 struct rdma_id_private *id_priv;
3835 int ret = NOTIFY_DONE;
3836
3837 if (event != NETDEV_BONDING_FAILOVER)
3838 return NOTIFY_DONE;
3839
3840 if (!(ndev->flags & IFF_MASTER) || !(ndev->priv_flags & IFF_BONDING))
3841 return NOTIFY_DONE;
3842
3843 mutex_lock(&lock);
3844 list_for_each_entry(cma_dev, &dev_list, list)
3845 list_for_each_entry(id_priv, &cma_dev->id_list, list) {
3846 ret = cma_netdev_change(ndev, id_priv);
3847 if (ret)
3848 goto out;
3849 }
3850
3851 out:
3852 mutex_unlock(&lock);
3853 return ret;
3854 }
3855
3856 static struct notifier_block cma_nb = {
3857 .notifier_call = cma_netdev_callback
3858 };
3859
3860 static void cma_add_one(struct ib_device *device)
3861 {
3862 struct cma_device *cma_dev;
3863 struct rdma_id_private *id_priv;
3864
3865 cma_dev = kmalloc(sizeof *cma_dev, GFP_KERNEL);
3866 if (!cma_dev)
3867 return;
3868
3869 cma_dev->device = device;
3870
3871 init_completion(&cma_dev->comp);
3872 atomic_set(&cma_dev->refcount, 1);
3873 INIT_LIST_HEAD(&cma_dev->id_list);
3874 ib_set_client_data(device, &cma_client, cma_dev);
3875
3876 mutex_lock(&lock);
3877 list_add_tail(&cma_dev->list, &dev_list);
3878 list_for_each_entry(id_priv, &listen_any_list, list)
3879 cma_listen_on_dev(id_priv, cma_dev);
3880 mutex_unlock(&lock);
3881 }
3882
3883 static int cma_remove_id_dev(struct rdma_id_private *id_priv)
3884 {
3885 struct rdma_cm_event event;
3886 enum rdma_cm_state state;
3887 int ret = 0;
3888
3889 /* Record that we want to remove the device */
3890 state = cma_exch(id_priv, RDMA_CM_DEVICE_REMOVAL);
3891 if (state == RDMA_CM_DESTROYING)
3892 return 0;
3893
3894 cma_cancel_operation(id_priv, state);
3895 mutex_lock(&id_priv->handler_mutex);
3896
3897 /* Check for destruction from another callback. */
3898 if (!cma_comp(id_priv, RDMA_CM_DEVICE_REMOVAL))
3899 goto out;
3900
3901 memset(&event, 0, sizeof event);
3902 event.event = RDMA_CM_EVENT_DEVICE_REMOVAL;
3903 ret = id_priv->id.event_handler(&id_priv->id, &event);
3904 out:
3905 mutex_unlock(&id_priv->handler_mutex);
3906 return ret;
3907 }
3908
3909 static void cma_process_remove(struct cma_device *cma_dev)
3910 {
3911 struct rdma_id_private *id_priv;
3912 int ret;
3913
3914 mutex_lock(&lock);
3915 while (!list_empty(&cma_dev->id_list)) {
3916 id_priv = list_entry(cma_dev->id_list.next,
3917 struct rdma_id_private, list);
3918
3919 list_del(&id_priv->listen_list);
3920 list_del_init(&id_priv->list);
3921 atomic_inc(&id_priv->refcount);
3922 mutex_unlock(&lock);
3923
3924 ret = id_priv->internal_id ? 1 : cma_remove_id_dev(id_priv);
3925 cma_deref_id(id_priv);
3926 if (ret)
3927 rdma_destroy_id(&id_priv->id);
3928
3929 mutex_lock(&lock);
3930 }
3931 mutex_unlock(&lock);
3932
3933 cma_deref_dev(cma_dev);
3934 wait_for_completion(&cma_dev->comp);
3935 }
3936
3937 static void cma_remove_one(struct ib_device *device, void *client_data)
3938 {
3939 struct cma_device *cma_dev = client_data;
3940
3941 if (!cma_dev)
3942 return;
3943
3944 mutex_lock(&lock);
3945 list_del(&cma_dev->list);
3946 mutex_unlock(&lock);
3947
3948 cma_process_remove(cma_dev);
3949 kfree(cma_dev);
3950 }
3951
3952 static int cma_get_id_stats(struct sk_buff *skb, struct netlink_callback *cb)
3953 {
3954 struct nlmsghdr *nlh;
3955 struct rdma_cm_id_stats *id_stats;
3956 struct rdma_id_private *id_priv;
3957 struct rdma_cm_id *id = NULL;
3958 struct cma_device *cma_dev;
3959 int i_dev = 0, i_id = 0;
3960
3961 /*
3962 * We export all of the IDs as a sequence of messages. Each
3963 * ID gets its own netlink message.
3964 */
3965 mutex_lock(&lock);
3966
3967 list_for_each_entry(cma_dev, &dev_list, list) {
3968 if (i_dev < cb->args[0]) {
3969 i_dev++;
3970 continue;
3971 }
3972
3973 i_id = 0;
3974 list_for_each_entry(id_priv, &cma_dev->id_list, list) {
3975 if (i_id < cb->args[1]) {
3976 i_id++;
3977 continue;
3978 }
3979
3980 id_stats = ibnl_put_msg(skb, &nlh, cb->nlh->nlmsg_seq,
3981 sizeof *id_stats, RDMA_NL_RDMA_CM,
3982 RDMA_NL_RDMA_CM_ID_STATS,
3983 NLM_F_MULTI);
3984 if (!id_stats)
3985 goto out;
3986
3987 memset(id_stats, 0, sizeof *id_stats);
3988 id = &id_priv->id;
3989 id_stats->node_type = id->route.addr.dev_addr.dev_type;
3990 id_stats->port_num = id->port_num;
3991 id_stats->bound_dev_if =
3992 id->route.addr.dev_addr.bound_dev_if;
3993
3994 if (ibnl_put_attr(skb, nlh,
3995 rdma_addr_size(cma_src_addr(id_priv)),
3996 cma_src_addr(id_priv),
3997 RDMA_NL_RDMA_CM_ATTR_SRC_ADDR))
3998 goto out;
3999 if (ibnl_put_attr(skb, nlh,
4000 rdma_addr_size(cma_src_addr(id_priv)),
4001 cma_dst_addr(id_priv),
4002 RDMA_NL_RDMA_CM_ATTR_DST_ADDR))
4003 goto out;
4004
4005 id_stats->pid = id_priv->owner;
4006 id_stats->port_space = id->ps;
4007 id_stats->cm_state = id_priv->state;
4008 id_stats->qp_num = id_priv->qp_num;
4009 id_stats->qp_type = id->qp_type;
4010
4011 i_id++;
4012 }
4013
4014 cb->args[1] = 0;
4015 i_dev++;
4016 }
4017
4018 out:
4019 mutex_unlock(&lock);
4020 cb->args[0] = i_dev;
4021 cb->args[1] = i_id;
4022
4023 return skb->len;
4024 }
4025
4026 static const struct ibnl_client_cbs cma_cb_table[] = {
4027 [RDMA_NL_RDMA_CM_ID_STATS] = { .dump = cma_get_id_stats,
4028 .module = THIS_MODULE },
4029 };
4030
4031 static int cma_init_net(struct net *net)
4032 {
4033 struct cma_pernet *pernet = cma_pernet(net);
4034
4035 idr_init(&pernet->tcp_ps);
4036 idr_init(&pernet->udp_ps);
4037 idr_init(&pernet->ipoib_ps);
4038 idr_init(&pernet->ib_ps);
4039
4040 return 0;
4041 }
4042
4043 static void cma_exit_net(struct net *net)
4044 {
4045 struct cma_pernet *pernet = cma_pernet(net);
4046
4047 idr_destroy(&pernet->tcp_ps);
4048 idr_destroy(&pernet->udp_ps);
4049 idr_destroy(&pernet->ipoib_ps);
4050 idr_destroy(&pernet->ib_ps);
4051 }
4052
4053 static struct pernet_operations cma_pernet_operations = {
4054 .init = cma_init_net,
4055 .exit = cma_exit_net,
4056 .id = &cma_pernet_id,
4057 .size = sizeof(struct cma_pernet),
4058 };
4059
4060 static int __init cma_init(void)
4061 {
4062 int ret;
4063
4064 cma_wq = create_singlethread_workqueue("rdma_cm");
4065 if (!cma_wq)
4066 return -ENOMEM;
4067
4068 ret = register_pernet_subsys(&cma_pernet_operations);
4069 if (ret)
4070 goto err_wq;
4071
4072 ib_sa_register_client(&sa_client);
4073 rdma_addr_register_client(&addr_client);
4074 register_netdevice_notifier(&cma_nb);
4075
4076 ret = ib_register_client(&cma_client);
4077 if (ret)
4078 goto err;
4079
4080 if (ibnl_add_client(RDMA_NL_RDMA_CM, RDMA_NL_RDMA_CM_NUM_OPS, cma_cb_table))
4081 printk(KERN_WARNING "RDMA CMA: failed to add netlink callback\n");
4082
4083 return 0;
4084
4085 err:
4086 unregister_netdevice_notifier(&cma_nb);
4087 rdma_addr_unregister_client(&addr_client);
4088 ib_sa_unregister_client(&sa_client);
4089 err_wq:
4090 destroy_workqueue(cma_wq);
4091 return ret;
4092 }
4093
4094 static void __exit cma_cleanup(void)
4095 {
4096 ibnl_remove_client(RDMA_NL_RDMA_CM);
4097 ib_unregister_client(&cma_client);
4098 unregister_netdevice_notifier(&cma_nb);
4099 rdma_addr_unregister_client(&addr_client);
4100 ib_sa_unregister_client(&sa_client);
4101 unregister_pernet_subsys(&cma_pernet_operations);
4102 destroy_workqueue(cma_wq);
4103 }
4104
4105 module_init(cma_init);
4106 module_exit(cma_cleanup);
Linux kernel - Deliverables
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