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Merge tag 'kvm-arm-for-4.5-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm...
[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_id_private *id_priv,
1269 const struct net_device *net_dev)
1270 {
1271 const struct rdma_addr *addr = &id_priv->id.route.addr;
1272
1273 if (!net_dev)
1274 /* This request is an AF_IB request or a RoCE request */
1275 return addr->src_addr.ss_family == AF_IB ||
1276 cma_protocol_roce(&id_priv->id);
1277
1278 return !addr->dev_addr.bound_dev_if ||
1279 (net_eq(dev_net(net_dev), addr->dev_addr.net) &&
1280 addr->dev_addr.bound_dev_if == net_dev->ifindex);
1281 }
1282
1283 static struct rdma_id_private *cma_find_listener(
1284 const struct rdma_bind_list *bind_list,
1285 const struct ib_cm_id *cm_id,
1286 const struct ib_cm_event *ib_event,
1287 const struct cma_req_info *req,
1288 const struct net_device *net_dev)
1289 {
1290 struct rdma_id_private *id_priv, *id_priv_dev;
1291
1292 if (!bind_list)
1293 return ERR_PTR(-EINVAL);
1294
1295 hlist_for_each_entry(id_priv, &bind_list->owners, node) {
1296 if (cma_match_private_data(id_priv, ib_event->private_data)) {
1297 if (id_priv->id.device == cm_id->device &&
1298 cma_match_net_dev(id_priv, net_dev))
1299 return id_priv;
1300 list_for_each_entry(id_priv_dev,
1301 &id_priv->listen_list,
1302 listen_list) {
1303 if (id_priv_dev->id.device == cm_id->device &&
1304 cma_match_net_dev(id_priv_dev, net_dev))
1305 return id_priv_dev;
1306 }
1307 }
1308 }
1309
1310 return ERR_PTR(-EINVAL);
1311 }
1312
1313 static struct rdma_id_private *cma_id_from_event(struct ib_cm_id *cm_id,
1314 struct ib_cm_event *ib_event,
1315 struct net_device **net_dev)
1316 {
1317 struct cma_req_info req;
1318 struct rdma_bind_list *bind_list;
1319 struct rdma_id_private *id_priv;
1320 int err;
1321
1322 err = cma_save_req_info(ib_event, &req);
1323 if (err)
1324 return ERR_PTR(err);
1325
1326 *net_dev = cma_get_net_dev(ib_event, &req);
1327 if (IS_ERR(*net_dev)) {
1328 if (PTR_ERR(*net_dev) == -EAFNOSUPPORT) {
1329 /* Assuming the protocol is AF_IB */
1330 *net_dev = NULL;
1331 } else if (cma_protocol_roce_dev_port(req.device, req.port)) {
1332 /* TODO find the net dev matching the request parameters
1333 * through the RoCE GID table */
1334 *net_dev = NULL;
1335 } else {
1336 return ERR_CAST(*net_dev);
1337 }
1338 }
1339
1340 bind_list = cma_ps_find(*net_dev ? dev_net(*net_dev) : &init_net,
1341 rdma_ps_from_service_id(req.service_id),
1342 cma_port_from_service_id(req.service_id));
1343 id_priv = cma_find_listener(bind_list, cm_id, ib_event, &req, *net_dev);
1344 if (IS_ERR(id_priv) && *net_dev) {
1345 dev_put(*net_dev);
1346 *net_dev = NULL;
1347 }
1348
1349 return id_priv;
1350 }
1351
1352 static inline int cma_user_data_offset(struct rdma_id_private *id_priv)
1353 {
1354 return cma_family(id_priv) == AF_IB ? 0 : sizeof(struct cma_hdr);
1355 }
1356
1357 static void cma_cancel_route(struct rdma_id_private *id_priv)
1358 {
1359 if (rdma_cap_ib_sa(id_priv->id.device, id_priv->id.port_num)) {
1360 if (id_priv->query)
1361 ib_sa_cancel_query(id_priv->query_id, id_priv->query);
1362 }
1363 }
1364
1365 static void cma_cancel_listens(struct rdma_id_private *id_priv)
1366 {
1367 struct rdma_id_private *dev_id_priv;
1368
1369 /*
1370 * Remove from listen_any_list to prevent added devices from spawning
1371 * additional listen requests.
1372 */
1373 mutex_lock(&lock);
1374 list_del(&id_priv->list);
1375
1376 while (!list_empty(&id_priv->listen_list)) {
1377 dev_id_priv = list_entry(id_priv->listen_list.next,
1378 struct rdma_id_private, listen_list);
1379 /* sync with device removal to avoid duplicate destruction */
1380 list_del_init(&dev_id_priv->list);
1381 list_del(&dev_id_priv->listen_list);
1382 mutex_unlock(&lock);
1383
1384 rdma_destroy_id(&dev_id_priv->id);
1385 mutex_lock(&lock);
1386 }
1387 mutex_unlock(&lock);
1388 }
1389
1390 static void cma_cancel_operation(struct rdma_id_private *id_priv,
1391 enum rdma_cm_state state)
1392 {
1393 switch (state) {
1394 case RDMA_CM_ADDR_QUERY:
1395 rdma_addr_cancel(&id_priv->id.route.addr.dev_addr);
1396 break;
1397 case RDMA_CM_ROUTE_QUERY:
1398 cma_cancel_route(id_priv);
1399 break;
1400 case RDMA_CM_LISTEN:
1401 if (cma_any_addr(cma_src_addr(id_priv)) && !id_priv->cma_dev)
1402 cma_cancel_listens(id_priv);
1403 break;
1404 default:
1405 break;
1406 }
1407 }
1408
1409 static void cma_release_port(struct rdma_id_private *id_priv)
1410 {
1411 struct rdma_bind_list *bind_list = id_priv->bind_list;
1412 struct net *net = id_priv->id.route.addr.dev_addr.net;
1413
1414 if (!bind_list)
1415 return;
1416
1417 mutex_lock(&lock);
1418 hlist_del(&id_priv->node);
1419 if (hlist_empty(&bind_list->owners)) {
1420 cma_ps_remove(net, bind_list->ps, bind_list->port);
1421 kfree(bind_list);
1422 }
1423 mutex_unlock(&lock);
1424 }
1425
1426 static void cma_leave_mc_groups(struct rdma_id_private *id_priv)
1427 {
1428 struct cma_multicast *mc;
1429
1430 while (!list_empty(&id_priv->mc_list)) {
1431 mc = container_of(id_priv->mc_list.next,
1432 struct cma_multicast, list);
1433 list_del(&mc->list);
1434 if (rdma_cap_ib_mcast(id_priv->cma_dev->device,
1435 id_priv->id.port_num)) {
1436 ib_sa_free_multicast(mc->multicast.ib);
1437 kfree(mc);
1438 } else
1439 kref_put(&mc->mcref, release_mc);
1440 }
1441 }
1442
1443 void rdma_destroy_id(struct rdma_cm_id *id)
1444 {
1445 struct rdma_id_private *id_priv;
1446 enum rdma_cm_state state;
1447
1448 id_priv = container_of(id, struct rdma_id_private, id);
1449 state = cma_exch(id_priv, RDMA_CM_DESTROYING);
1450 cma_cancel_operation(id_priv, state);
1451
1452 /*
1453 * Wait for any active callback to finish. New callbacks will find
1454 * the id_priv state set to destroying and abort.
1455 */
1456 mutex_lock(&id_priv->handler_mutex);
1457 mutex_unlock(&id_priv->handler_mutex);
1458
1459 if (id_priv->cma_dev) {
1460 if (rdma_cap_ib_cm(id_priv->id.device, 1)) {
1461 if (id_priv->cm_id.ib)
1462 ib_destroy_cm_id(id_priv->cm_id.ib);
1463 } else if (rdma_cap_iw_cm(id_priv->id.device, 1)) {
1464 if (id_priv->cm_id.iw)
1465 iw_destroy_cm_id(id_priv->cm_id.iw);
1466 }
1467 cma_leave_mc_groups(id_priv);
1468 cma_release_dev(id_priv);
1469 }
1470
1471 cma_release_port(id_priv);
1472 cma_deref_id(id_priv);
1473 wait_for_completion(&id_priv->comp);
1474
1475 if (id_priv->internal_id)
1476 cma_deref_id(id_priv->id.context);
1477
1478 kfree(id_priv->id.route.path_rec);
1479 put_net(id_priv->id.route.addr.dev_addr.net);
1480 kfree(id_priv);
1481 }
1482 EXPORT_SYMBOL(rdma_destroy_id);
1483
1484 static int cma_rep_recv(struct rdma_id_private *id_priv)
1485 {
1486 int ret;
1487
1488 ret = cma_modify_qp_rtr(id_priv, NULL);
1489 if (ret)
1490 goto reject;
1491
1492 ret = cma_modify_qp_rts(id_priv, NULL);
1493 if (ret)
1494 goto reject;
1495
1496 ret = ib_send_cm_rtu(id_priv->cm_id.ib, NULL, 0);
1497 if (ret)
1498 goto reject;
1499
1500 return 0;
1501 reject:
1502 cma_modify_qp_err(id_priv);
1503 ib_send_cm_rej(id_priv->cm_id.ib, IB_CM_REJ_CONSUMER_DEFINED,
1504 NULL, 0, NULL, 0);
1505 return ret;
1506 }
1507
1508 static void cma_set_rep_event_data(struct rdma_cm_event *event,
1509 struct ib_cm_rep_event_param *rep_data,
1510 void *private_data)
1511 {
1512 event->param.conn.private_data = private_data;
1513 event->param.conn.private_data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
1514 event->param.conn.responder_resources = rep_data->responder_resources;
1515 event->param.conn.initiator_depth = rep_data->initiator_depth;
1516 event->param.conn.flow_control = rep_data->flow_control;
1517 event->param.conn.rnr_retry_count = rep_data->rnr_retry_count;
1518 event->param.conn.srq = rep_data->srq;
1519 event->param.conn.qp_num = rep_data->remote_qpn;
1520 }
1521
1522 static int cma_ib_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
1523 {
1524 struct rdma_id_private *id_priv = cm_id->context;
1525 struct rdma_cm_event event;
1526 int ret = 0;
1527
1528 if ((ib_event->event != IB_CM_TIMEWAIT_EXIT &&
1529 cma_disable_callback(id_priv, RDMA_CM_CONNECT)) ||
1530 (ib_event->event == IB_CM_TIMEWAIT_EXIT &&
1531 cma_disable_callback(id_priv, RDMA_CM_DISCONNECT)))
1532 return 0;
1533
1534 memset(&event, 0, sizeof event);
1535 switch (ib_event->event) {
1536 case IB_CM_REQ_ERROR:
1537 case IB_CM_REP_ERROR:
1538 event.event = RDMA_CM_EVENT_UNREACHABLE;
1539 event.status = -ETIMEDOUT;
1540 break;
1541 case IB_CM_REP_RECEIVED:
1542 if (id_priv->id.qp) {
1543 event.status = cma_rep_recv(id_priv);
1544 event.event = event.status ? RDMA_CM_EVENT_CONNECT_ERROR :
1545 RDMA_CM_EVENT_ESTABLISHED;
1546 } else {
1547 event.event = RDMA_CM_EVENT_CONNECT_RESPONSE;
1548 }
1549 cma_set_rep_event_data(&event, &ib_event->param.rep_rcvd,
1550 ib_event->private_data);
1551 break;
1552 case IB_CM_RTU_RECEIVED:
1553 case IB_CM_USER_ESTABLISHED:
1554 event.event = RDMA_CM_EVENT_ESTABLISHED;
1555 break;
1556 case IB_CM_DREQ_ERROR:
1557 event.status = -ETIMEDOUT; /* fall through */
1558 case IB_CM_DREQ_RECEIVED:
1559 case IB_CM_DREP_RECEIVED:
1560 if (!cma_comp_exch(id_priv, RDMA_CM_CONNECT,
1561 RDMA_CM_DISCONNECT))
1562 goto out;
1563 event.event = RDMA_CM_EVENT_DISCONNECTED;
1564 break;
1565 case IB_CM_TIMEWAIT_EXIT:
1566 event.event = RDMA_CM_EVENT_TIMEWAIT_EXIT;
1567 break;
1568 case IB_CM_MRA_RECEIVED:
1569 /* ignore event */
1570 goto out;
1571 case IB_CM_REJ_RECEIVED:
1572 cma_modify_qp_err(id_priv);
1573 event.status = ib_event->param.rej_rcvd.reason;
1574 event.event = RDMA_CM_EVENT_REJECTED;
1575 event.param.conn.private_data = ib_event->private_data;
1576 event.param.conn.private_data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
1577 break;
1578 default:
1579 printk(KERN_ERR "RDMA CMA: unexpected IB CM event: %d\n",
1580 ib_event->event);
1581 goto out;
1582 }
1583
1584 ret = id_priv->id.event_handler(&id_priv->id, &event);
1585 if (ret) {
1586 /* Destroy the CM ID by returning a non-zero value. */
1587 id_priv->cm_id.ib = NULL;
1588 cma_exch(id_priv, RDMA_CM_DESTROYING);
1589 mutex_unlock(&id_priv->handler_mutex);
1590 rdma_destroy_id(&id_priv->id);
1591 return ret;
1592 }
1593 out:
1594 mutex_unlock(&id_priv->handler_mutex);
1595 return ret;
1596 }
1597
1598 static struct rdma_id_private *cma_new_conn_id(struct rdma_cm_id *listen_id,
1599 struct ib_cm_event *ib_event,
1600 struct net_device *net_dev)
1601 {
1602 struct rdma_id_private *id_priv;
1603 struct rdma_cm_id *id;
1604 struct rdma_route *rt;
1605 const sa_family_t ss_family = listen_id->route.addr.src_addr.ss_family;
1606 const __be64 service_id =
1607 ib_event->param.req_rcvd.primary_path->service_id;
1608 int ret;
1609
1610 id = rdma_create_id(listen_id->route.addr.dev_addr.net,
1611 listen_id->event_handler, listen_id->context,
1612 listen_id->ps, ib_event->param.req_rcvd.qp_type);
1613 if (IS_ERR(id))
1614 return NULL;
1615
1616 id_priv = container_of(id, struct rdma_id_private, id);
1617 if (cma_save_net_info((struct sockaddr *)&id->route.addr.src_addr,
1618 (struct sockaddr *)&id->route.addr.dst_addr,
1619 listen_id, ib_event, ss_family, service_id))
1620 goto err;
1621
1622 rt = &id->route;
1623 rt->num_paths = ib_event->param.req_rcvd.alternate_path ? 2 : 1;
1624 rt->path_rec = kmalloc(sizeof *rt->path_rec * rt->num_paths,
1625 GFP_KERNEL);
1626 if (!rt->path_rec)
1627 goto err;
1628
1629 rt->path_rec[0] = *ib_event->param.req_rcvd.primary_path;
1630 if (rt->num_paths == 2)
1631 rt->path_rec[1] = *ib_event->param.req_rcvd.alternate_path;
1632
1633 if (net_dev) {
1634 ret = rdma_copy_addr(&rt->addr.dev_addr, net_dev, NULL);
1635 if (ret)
1636 goto err;
1637 } else {
1638 if (!cma_protocol_roce(listen_id) &&
1639 cma_any_addr(cma_src_addr(id_priv))) {
1640 rt->addr.dev_addr.dev_type = ARPHRD_INFINIBAND;
1641 rdma_addr_set_sgid(&rt->addr.dev_addr, &rt->path_rec[0].sgid);
1642 ib_addr_set_pkey(&rt->addr.dev_addr, be16_to_cpu(rt->path_rec[0].pkey));
1643 } else if (!cma_any_addr(cma_src_addr(id_priv))) {
1644 ret = cma_translate_addr(cma_src_addr(id_priv), &rt->addr.dev_addr);
1645 if (ret)
1646 goto err;
1647 }
1648 }
1649 rdma_addr_set_dgid(&rt->addr.dev_addr, &rt->path_rec[0].dgid);
1650
1651 id_priv->state = RDMA_CM_CONNECT;
1652 return id_priv;
1653
1654 err:
1655 rdma_destroy_id(id);
1656 return NULL;
1657 }
1658
1659 static struct rdma_id_private *cma_new_udp_id(struct rdma_cm_id *listen_id,
1660 struct ib_cm_event *ib_event,
1661 struct net_device *net_dev)
1662 {
1663 struct rdma_id_private *id_priv;
1664 struct rdma_cm_id *id;
1665 const sa_family_t ss_family = listen_id->route.addr.src_addr.ss_family;
1666 struct net *net = listen_id->route.addr.dev_addr.net;
1667 int ret;
1668
1669 id = rdma_create_id(net, listen_id->event_handler, listen_id->context,
1670 listen_id->ps, IB_QPT_UD);
1671 if (IS_ERR(id))
1672 return NULL;
1673
1674 id_priv = container_of(id, struct rdma_id_private, id);
1675 if (cma_save_net_info((struct sockaddr *)&id->route.addr.src_addr,
1676 (struct sockaddr *)&id->route.addr.dst_addr,
1677 listen_id, ib_event, ss_family,
1678 ib_event->param.sidr_req_rcvd.service_id))
1679 goto err;
1680
1681 if (net_dev) {
1682 ret = rdma_copy_addr(&id->route.addr.dev_addr, net_dev, NULL);
1683 if (ret)
1684 goto err;
1685 } else {
1686 if (!cma_any_addr(cma_src_addr(id_priv))) {
1687 ret = cma_translate_addr(cma_src_addr(id_priv),
1688 &id->route.addr.dev_addr);
1689 if (ret)
1690 goto err;
1691 }
1692 }
1693
1694 id_priv->state = RDMA_CM_CONNECT;
1695 return id_priv;
1696 err:
1697 rdma_destroy_id(id);
1698 return NULL;
1699 }
1700
1701 static void cma_set_req_event_data(struct rdma_cm_event *event,
1702 struct ib_cm_req_event_param *req_data,
1703 void *private_data, int offset)
1704 {
1705 event->param.conn.private_data = private_data + offset;
1706 event->param.conn.private_data_len = IB_CM_REQ_PRIVATE_DATA_SIZE - offset;
1707 event->param.conn.responder_resources = req_data->responder_resources;
1708 event->param.conn.initiator_depth = req_data->initiator_depth;
1709 event->param.conn.flow_control = req_data->flow_control;
1710 event->param.conn.retry_count = req_data->retry_count;
1711 event->param.conn.rnr_retry_count = req_data->rnr_retry_count;
1712 event->param.conn.srq = req_data->srq;
1713 event->param.conn.qp_num = req_data->remote_qpn;
1714 }
1715
1716 static int cma_check_req_qp_type(struct rdma_cm_id *id, struct ib_cm_event *ib_event)
1717 {
1718 return (((ib_event->event == IB_CM_REQ_RECEIVED) &&
1719 (ib_event->param.req_rcvd.qp_type == id->qp_type)) ||
1720 ((ib_event->event == IB_CM_SIDR_REQ_RECEIVED) &&
1721 (id->qp_type == IB_QPT_UD)) ||
1722 (!id->qp_type));
1723 }
1724
1725 static int cma_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
1726 {
1727 struct rdma_id_private *listen_id, *conn_id;
1728 struct rdma_cm_event event;
1729 struct net_device *net_dev;
1730 int offset, ret;
1731
1732 listen_id = cma_id_from_event(cm_id, ib_event, &net_dev);
1733 if (IS_ERR(listen_id))
1734 return PTR_ERR(listen_id);
1735
1736 if (!cma_check_req_qp_type(&listen_id->id, ib_event)) {
1737 ret = -EINVAL;
1738 goto net_dev_put;
1739 }
1740
1741 if (cma_disable_callback(listen_id, RDMA_CM_LISTEN)) {
1742 ret = -ECONNABORTED;
1743 goto net_dev_put;
1744 }
1745
1746 memset(&event, 0, sizeof event);
1747 offset = cma_user_data_offset(listen_id);
1748 event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
1749 if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED) {
1750 conn_id = cma_new_udp_id(&listen_id->id, ib_event, net_dev);
1751 event.param.ud.private_data = ib_event->private_data + offset;
1752 event.param.ud.private_data_len =
1753 IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE - offset;
1754 } else {
1755 conn_id = cma_new_conn_id(&listen_id->id, ib_event, net_dev);
1756 cma_set_req_event_data(&event, &ib_event->param.req_rcvd,
1757 ib_event->private_data, offset);
1758 }
1759 if (!conn_id) {
1760 ret = -ENOMEM;
1761 goto err1;
1762 }
1763
1764 mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
1765 ret = cma_acquire_dev(conn_id, listen_id);
1766 if (ret)
1767 goto err2;
1768
1769 conn_id->cm_id.ib = cm_id;
1770 cm_id->context = conn_id;
1771 cm_id->cm_handler = cma_ib_handler;
1772
1773 /*
1774 * Protect against the user destroying conn_id from another thread
1775 * until we're done accessing it.
1776 */
1777 atomic_inc(&conn_id->refcount);
1778 ret = conn_id->id.event_handler(&conn_id->id, &event);
1779 if (ret)
1780 goto err3;
1781 /*
1782 * Acquire mutex to prevent user executing rdma_destroy_id()
1783 * while we're accessing the cm_id.
1784 */
1785 mutex_lock(&lock);
1786 if (cma_comp(conn_id, RDMA_CM_CONNECT) &&
1787 (conn_id->id.qp_type != IB_QPT_UD))
1788 ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0);
1789 mutex_unlock(&lock);
1790 mutex_unlock(&conn_id->handler_mutex);
1791 mutex_unlock(&listen_id->handler_mutex);
1792 cma_deref_id(conn_id);
1793 if (net_dev)
1794 dev_put(net_dev);
1795 return 0;
1796
1797 err3:
1798 cma_deref_id(conn_id);
1799 /* Destroy the CM ID by returning a non-zero value. */
1800 conn_id->cm_id.ib = NULL;
1801 err2:
1802 cma_exch(conn_id, RDMA_CM_DESTROYING);
1803 mutex_unlock(&conn_id->handler_mutex);
1804 err1:
1805 mutex_unlock(&listen_id->handler_mutex);
1806 if (conn_id)
1807 rdma_destroy_id(&conn_id->id);
1808
1809 net_dev_put:
1810 if (net_dev)
1811 dev_put(net_dev);
1812
1813 return ret;
1814 }
1815
1816 __be64 rdma_get_service_id(struct rdma_cm_id *id, struct sockaddr *addr)
1817 {
1818 if (addr->sa_family == AF_IB)
1819 return ((struct sockaddr_ib *) addr)->sib_sid;
1820
1821 return cpu_to_be64(((u64)id->ps << 16) + be16_to_cpu(cma_port(addr)));
1822 }
1823 EXPORT_SYMBOL(rdma_get_service_id);
1824
1825 static int cma_iw_handler(struct iw_cm_id *iw_id, struct iw_cm_event *iw_event)
1826 {
1827 struct rdma_id_private *id_priv = iw_id->context;
1828 struct rdma_cm_event event;
1829 int ret = 0;
1830 struct sockaddr *laddr = (struct sockaddr *)&iw_event->local_addr;
1831 struct sockaddr *raddr = (struct sockaddr *)&iw_event->remote_addr;
1832
1833 if (cma_disable_callback(id_priv, RDMA_CM_CONNECT))
1834 return 0;
1835
1836 memset(&event, 0, sizeof event);
1837 switch (iw_event->event) {
1838 case IW_CM_EVENT_CLOSE:
1839 event.event = RDMA_CM_EVENT_DISCONNECTED;
1840 break;
1841 case IW_CM_EVENT_CONNECT_REPLY:
1842 memcpy(cma_src_addr(id_priv), laddr,
1843 rdma_addr_size(laddr));
1844 memcpy(cma_dst_addr(id_priv), raddr,
1845 rdma_addr_size(raddr));
1846 switch (iw_event->status) {
1847 case 0:
1848 event.event = RDMA_CM_EVENT_ESTABLISHED;
1849 event.param.conn.initiator_depth = iw_event->ird;
1850 event.param.conn.responder_resources = iw_event->ord;
1851 break;
1852 case -ECONNRESET:
1853 case -ECONNREFUSED:
1854 event.event = RDMA_CM_EVENT_REJECTED;
1855 break;
1856 case -ETIMEDOUT:
1857 event.event = RDMA_CM_EVENT_UNREACHABLE;
1858 break;
1859 default:
1860 event.event = RDMA_CM_EVENT_CONNECT_ERROR;
1861 break;
1862 }
1863 break;
1864 case IW_CM_EVENT_ESTABLISHED:
1865 event.event = RDMA_CM_EVENT_ESTABLISHED;
1866 event.param.conn.initiator_depth = iw_event->ird;
1867 event.param.conn.responder_resources = iw_event->ord;
1868 break;
1869 default:
1870 BUG_ON(1);
1871 }
1872
1873 event.status = iw_event->status;
1874 event.param.conn.private_data = iw_event->private_data;
1875 event.param.conn.private_data_len = iw_event->private_data_len;
1876 ret = id_priv->id.event_handler(&id_priv->id, &event);
1877 if (ret) {
1878 /* Destroy the CM ID by returning a non-zero value. */
1879 id_priv->cm_id.iw = NULL;
1880 cma_exch(id_priv, RDMA_CM_DESTROYING);
1881 mutex_unlock(&id_priv->handler_mutex);
1882 rdma_destroy_id(&id_priv->id);
1883 return ret;
1884 }
1885
1886 mutex_unlock(&id_priv->handler_mutex);
1887 return ret;
1888 }
1889
1890 static int iw_conn_req_handler(struct iw_cm_id *cm_id,
1891 struct iw_cm_event *iw_event)
1892 {
1893 struct rdma_cm_id *new_cm_id;
1894 struct rdma_id_private *listen_id, *conn_id;
1895 struct rdma_cm_event event;
1896 int ret;
1897 struct ib_device_attr attr;
1898 struct sockaddr *laddr = (struct sockaddr *)&iw_event->local_addr;
1899 struct sockaddr *raddr = (struct sockaddr *)&iw_event->remote_addr;
1900
1901 listen_id = cm_id->context;
1902 if (cma_disable_callback(listen_id, RDMA_CM_LISTEN))
1903 return -ECONNABORTED;
1904
1905 /* Create a new RDMA id for the new IW CM ID */
1906 new_cm_id = rdma_create_id(listen_id->id.route.addr.dev_addr.net,
1907 listen_id->id.event_handler,
1908 listen_id->id.context,
1909 RDMA_PS_TCP, IB_QPT_RC);
1910 if (IS_ERR(new_cm_id)) {
1911 ret = -ENOMEM;
1912 goto out;
1913 }
1914 conn_id = container_of(new_cm_id, struct rdma_id_private, id);
1915 mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
1916 conn_id->state = RDMA_CM_CONNECT;
1917
1918 ret = rdma_translate_ip(laddr, &conn_id->id.route.addr.dev_addr, NULL);
1919 if (ret) {
1920 mutex_unlock(&conn_id->handler_mutex);
1921 rdma_destroy_id(new_cm_id);
1922 goto out;
1923 }
1924
1925 ret = cma_acquire_dev(conn_id, listen_id);
1926 if (ret) {
1927 mutex_unlock(&conn_id->handler_mutex);
1928 rdma_destroy_id(new_cm_id);
1929 goto out;
1930 }
1931
1932 conn_id->cm_id.iw = cm_id;
1933 cm_id->context = conn_id;
1934 cm_id->cm_handler = cma_iw_handler;
1935
1936 memcpy(cma_src_addr(conn_id), laddr, rdma_addr_size(laddr));
1937 memcpy(cma_dst_addr(conn_id), raddr, rdma_addr_size(raddr));
1938
1939 ret = ib_query_device(conn_id->id.device, &attr);
1940 if (ret) {
1941 mutex_unlock(&conn_id->handler_mutex);
1942 rdma_destroy_id(new_cm_id);
1943 goto out;
1944 }
1945
1946 memset(&event, 0, sizeof event);
1947 event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
1948 event.param.conn.private_data = iw_event->private_data;
1949 event.param.conn.private_data_len = iw_event->private_data_len;
1950 event.param.conn.initiator_depth = iw_event->ird;
1951 event.param.conn.responder_resources = iw_event->ord;
1952
1953 /*
1954 * Protect against the user destroying conn_id from another thread
1955 * until we're done accessing it.
1956 */
1957 atomic_inc(&conn_id->refcount);
1958 ret = conn_id->id.event_handler(&conn_id->id, &event);
1959 if (ret) {
1960 /* User wants to destroy the CM ID */
1961 conn_id->cm_id.iw = NULL;
1962 cma_exch(conn_id, RDMA_CM_DESTROYING);
1963 mutex_unlock(&conn_id->handler_mutex);
1964 cma_deref_id(conn_id);
1965 rdma_destroy_id(&conn_id->id);
1966 goto out;
1967 }
1968
1969 mutex_unlock(&conn_id->handler_mutex);
1970 cma_deref_id(conn_id);
1971
1972 out:
1973 mutex_unlock(&listen_id->handler_mutex);
1974 return ret;
1975 }
1976
1977 static int cma_ib_listen(struct rdma_id_private *id_priv)
1978 {
1979 struct sockaddr *addr;
1980 struct ib_cm_id *id;
1981 __be64 svc_id;
1982
1983 addr = cma_src_addr(id_priv);
1984 svc_id = rdma_get_service_id(&id_priv->id, addr);
1985 id = ib_cm_insert_listen(id_priv->id.device, cma_req_handler, svc_id);
1986 if (IS_ERR(id))
1987 return PTR_ERR(id);
1988 id_priv->cm_id.ib = id;
1989
1990 return 0;
1991 }
1992
1993 static int cma_iw_listen(struct rdma_id_private *id_priv, int backlog)
1994 {
1995 int ret;
1996 struct iw_cm_id *id;
1997
1998 id = iw_create_cm_id(id_priv->id.device,
1999 iw_conn_req_handler,
2000 id_priv);
2001 if (IS_ERR(id))
2002 return PTR_ERR(id);
2003
2004 id->tos = id_priv->tos;
2005 id_priv->cm_id.iw = id;
2006
2007 memcpy(&id_priv->cm_id.iw->local_addr, cma_src_addr(id_priv),
2008 rdma_addr_size(cma_src_addr(id_priv)));
2009
2010 ret = iw_cm_listen(id_priv->cm_id.iw, backlog);
2011
2012 if (ret) {
2013 iw_destroy_cm_id(id_priv->cm_id.iw);
2014 id_priv->cm_id.iw = NULL;
2015 }
2016
2017 return ret;
2018 }
2019
2020 static int cma_listen_handler(struct rdma_cm_id *id,
2021 struct rdma_cm_event *event)
2022 {
2023 struct rdma_id_private *id_priv = id->context;
2024
2025 id->context = id_priv->id.context;
2026 id->event_handler = id_priv->id.event_handler;
2027 return id_priv->id.event_handler(id, event);
2028 }
2029
2030 static void cma_listen_on_dev(struct rdma_id_private *id_priv,
2031 struct cma_device *cma_dev)
2032 {
2033 struct rdma_id_private *dev_id_priv;
2034 struct rdma_cm_id *id;
2035 struct net *net = id_priv->id.route.addr.dev_addr.net;
2036 int ret;
2037
2038 if (cma_family(id_priv) == AF_IB && !rdma_cap_ib_cm(cma_dev->device, 1))
2039 return;
2040
2041 id = rdma_create_id(net, cma_listen_handler, id_priv, id_priv->id.ps,
2042 id_priv->id.qp_type);
2043 if (IS_ERR(id))
2044 return;
2045
2046 dev_id_priv = container_of(id, struct rdma_id_private, id);
2047
2048 dev_id_priv->state = RDMA_CM_ADDR_BOUND;
2049 memcpy(cma_src_addr(dev_id_priv), cma_src_addr(id_priv),
2050 rdma_addr_size(cma_src_addr(id_priv)));
2051
2052 cma_attach_to_dev(dev_id_priv, cma_dev);
2053 list_add_tail(&dev_id_priv->listen_list, &id_priv->listen_list);
2054 atomic_inc(&id_priv->refcount);
2055 dev_id_priv->internal_id = 1;
2056 dev_id_priv->afonly = id_priv->afonly;
2057
2058 ret = rdma_listen(id, id_priv->backlog);
2059 if (ret)
2060 printk(KERN_WARNING "RDMA CMA: cma_listen_on_dev, error %d, "
2061 "listening on device %s\n", ret, cma_dev->device->name);
2062 }
2063
2064 static void cma_listen_on_all(struct rdma_id_private *id_priv)
2065 {
2066 struct cma_device *cma_dev;
2067
2068 mutex_lock(&lock);
2069 list_add_tail(&id_priv->list, &listen_any_list);
2070 list_for_each_entry(cma_dev, &dev_list, list)
2071 cma_listen_on_dev(id_priv, cma_dev);
2072 mutex_unlock(&lock);
2073 }
2074
2075 void rdma_set_service_type(struct rdma_cm_id *id, int tos)
2076 {
2077 struct rdma_id_private *id_priv;
2078
2079 id_priv = container_of(id, struct rdma_id_private, id);
2080 id_priv->tos = (u8) tos;
2081 }
2082 EXPORT_SYMBOL(rdma_set_service_type);
2083
2084 static void cma_query_handler(int status, struct ib_sa_path_rec *path_rec,
2085 void *context)
2086 {
2087 struct cma_work *work = context;
2088 struct rdma_route *route;
2089
2090 route = &work->id->id.route;
2091
2092 if (!status) {
2093 route->num_paths = 1;
2094 *route->path_rec = *path_rec;
2095 } else {
2096 work->old_state = RDMA_CM_ROUTE_QUERY;
2097 work->new_state = RDMA_CM_ADDR_RESOLVED;
2098 work->event.event = RDMA_CM_EVENT_ROUTE_ERROR;
2099 work->event.status = status;
2100 }
2101
2102 queue_work(cma_wq, &work->work);
2103 }
2104
2105 static int cma_query_ib_route(struct rdma_id_private *id_priv, int timeout_ms,
2106 struct cma_work *work)
2107 {
2108 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
2109 struct ib_sa_path_rec path_rec;
2110 ib_sa_comp_mask comp_mask;
2111 struct sockaddr_in6 *sin6;
2112 struct sockaddr_ib *sib;
2113
2114 memset(&path_rec, 0, sizeof path_rec);
2115 rdma_addr_get_sgid(dev_addr, &path_rec.sgid);
2116 rdma_addr_get_dgid(dev_addr, &path_rec.dgid);
2117 path_rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
2118 path_rec.numb_path = 1;
2119 path_rec.reversible = 1;
2120 path_rec.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
2121
2122 comp_mask = IB_SA_PATH_REC_DGID | IB_SA_PATH_REC_SGID |
2123 IB_SA_PATH_REC_PKEY | IB_SA_PATH_REC_NUMB_PATH |
2124 IB_SA_PATH_REC_REVERSIBLE | IB_SA_PATH_REC_SERVICE_ID;
2125
2126 switch (cma_family(id_priv)) {
2127 case AF_INET:
2128 path_rec.qos_class = cpu_to_be16((u16) id_priv->tos);
2129 comp_mask |= IB_SA_PATH_REC_QOS_CLASS;
2130 break;
2131 case AF_INET6:
2132 sin6 = (struct sockaddr_in6 *) cma_src_addr(id_priv);
2133 path_rec.traffic_class = (u8) (be32_to_cpu(sin6->sin6_flowinfo) >> 20);
2134 comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
2135 break;
2136 case AF_IB:
2137 sib = (struct sockaddr_ib *) cma_src_addr(id_priv);
2138 path_rec.traffic_class = (u8) (be32_to_cpu(sib->sib_flowinfo) >> 20);
2139 comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
2140 break;
2141 }
2142
2143 id_priv->query_id = ib_sa_path_rec_get(&sa_client, id_priv->id.device,
2144 id_priv->id.port_num, &path_rec,
2145 comp_mask, timeout_ms,
2146 GFP_KERNEL, cma_query_handler,
2147 work, &id_priv->query);
2148
2149 return (id_priv->query_id < 0) ? id_priv->query_id : 0;
2150 }
2151
2152 static void cma_work_handler(struct work_struct *_work)
2153 {
2154 struct cma_work *work = container_of(_work, struct cma_work, work);
2155 struct rdma_id_private *id_priv = work->id;
2156 int destroy = 0;
2157
2158 mutex_lock(&id_priv->handler_mutex);
2159 if (!cma_comp_exch(id_priv, work->old_state, work->new_state))
2160 goto out;
2161
2162 if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
2163 cma_exch(id_priv, RDMA_CM_DESTROYING);
2164 destroy = 1;
2165 }
2166 out:
2167 mutex_unlock(&id_priv->handler_mutex);
2168 cma_deref_id(id_priv);
2169 if (destroy)
2170 rdma_destroy_id(&id_priv->id);
2171 kfree(work);
2172 }
2173
2174 static void cma_ndev_work_handler(struct work_struct *_work)
2175 {
2176 struct cma_ndev_work *work = container_of(_work, struct cma_ndev_work, work);
2177 struct rdma_id_private *id_priv = work->id;
2178 int destroy = 0;
2179
2180 mutex_lock(&id_priv->handler_mutex);
2181 if (id_priv->state == RDMA_CM_DESTROYING ||
2182 id_priv->state == RDMA_CM_DEVICE_REMOVAL)
2183 goto out;
2184
2185 if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
2186 cma_exch(id_priv, RDMA_CM_DESTROYING);
2187 destroy = 1;
2188 }
2189
2190 out:
2191 mutex_unlock(&id_priv->handler_mutex);
2192 cma_deref_id(id_priv);
2193 if (destroy)
2194 rdma_destroy_id(&id_priv->id);
2195 kfree(work);
2196 }
2197
2198 static int cma_resolve_ib_route(struct rdma_id_private *id_priv, int timeout_ms)
2199 {
2200 struct rdma_route *route = &id_priv->id.route;
2201 struct cma_work *work;
2202 int ret;
2203
2204 work = kzalloc(sizeof *work, GFP_KERNEL);
2205 if (!work)
2206 return -ENOMEM;
2207
2208 work->id = id_priv;
2209 INIT_WORK(&work->work, cma_work_handler);
2210 work->old_state = RDMA_CM_ROUTE_QUERY;
2211 work->new_state = RDMA_CM_ROUTE_RESOLVED;
2212 work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
2213
2214 route->path_rec = kmalloc(sizeof *route->path_rec, GFP_KERNEL);
2215 if (!route->path_rec) {
2216 ret = -ENOMEM;
2217 goto err1;
2218 }
2219
2220 ret = cma_query_ib_route(id_priv, timeout_ms, work);
2221 if (ret)
2222 goto err2;
2223
2224 return 0;
2225 err2:
2226 kfree(route->path_rec);
2227 route->path_rec = NULL;
2228 err1:
2229 kfree(work);
2230 return ret;
2231 }
2232
2233 int rdma_set_ib_paths(struct rdma_cm_id *id,
2234 struct ib_sa_path_rec *path_rec, int num_paths)
2235 {
2236 struct rdma_id_private *id_priv;
2237 int ret;
2238
2239 id_priv = container_of(id, struct rdma_id_private, id);
2240 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED,
2241 RDMA_CM_ROUTE_RESOLVED))
2242 return -EINVAL;
2243
2244 id->route.path_rec = kmemdup(path_rec, sizeof *path_rec * num_paths,
2245 GFP_KERNEL);
2246 if (!id->route.path_rec) {
2247 ret = -ENOMEM;
2248 goto err;
2249 }
2250
2251 id->route.num_paths = num_paths;
2252 return 0;
2253 err:
2254 cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_ADDR_RESOLVED);
2255 return ret;
2256 }
2257 EXPORT_SYMBOL(rdma_set_ib_paths);
2258
2259 static int cma_resolve_iw_route(struct rdma_id_private *id_priv, int timeout_ms)
2260 {
2261 struct cma_work *work;
2262
2263 work = kzalloc(sizeof *work, GFP_KERNEL);
2264 if (!work)
2265 return -ENOMEM;
2266
2267 work->id = id_priv;
2268 INIT_WORK(&work->work, cma_work_handler);
2269 work->old_state = RDMA_CM_ROUTE_QUERY;
2270 work->new_state = RDMA_CM_ROUTE_RESOLVED;
2271 work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
2272 queue_work(cma_wq, &work->work);
2273 return 0;
2274 }
2275
2276 static int iboe_tos_to_sl(struct net_device *ndev, int tos)
2277 {
2278 int prio;
2279 struct net_device *dev;
2280
2281 prio = rt_tos2priority(tos);
2282 dev = ndev->priv_flags & IFF_802_1Q_VLAN ?
2283 vlan_dev_real_dev(ndev) : ndev;
2284
2285 if (dev->num_tc)
2286 return netdev_get_prio_tc_map(dev, prio);
2287
2288 #if IS_ENABLED(CONFIG_VLAN_8021Q)
2289 if (ndev->priv_flags & IFF_802_1Q_VLAN)
2290 return (vlan_dev_get_egress_qos_mask(ndev, prio) &
2291 VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
2292 #endif
2293 return 0;
2294 }
2295
2296 static int cma_resolve_iboe_route(struct rdma_id_private *id_priv)
2297 {
2298 struct rdma_route *route = &id_priv->id.route;
2299 struct rdma_addr *addr = &route->addr;
2300 struct cma_work *work;
2301 int ret;
2302 struct net_device *ndev = NULL;
2303
2304
2305 work = kzalloc(sizeof *work, GFP_KERNEL);
2306 if (!work)
2307 return -ENOMEM;
2308
2309 work->id = id_priv;
2310 INIT_WORK(&work->work, cma_work_handler);
2311
2312 route->path_rec = kzalloc(sizeof *route->path_rec, GFP_KERNEL);
2313 if (!route->path_rec) {
2314 ret = -ENOMEM;
2315 goto err1;
2316 }
2317
2318 route->num_paths = 1;
2319
2320 if (addr->dev_addr.bound_dev_if) {
2321 ndev = dev_get_by_index(&init_net, addr->dev_addr.bound_dev_if);
2322 route->path_rec->net = &init_net;
2323 route->path_rec->ifindex = addr->dev_addr.bound_dev_if;
2324 }
2325 if (!ndev) {
2326 ret = -ENODEV;
2327 goto err2;
2328 }
2329
2330 memcpy(route->path_rec->dmac, addr->dev_addr.dst_dev_addr, ETH_ALEN);
2331
2332 rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
2333 &route->path_rec->sgid);
2334 rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.dst_addr,
2335 &route->path_rec->dgid);
2336
2337 route->path_rec->hop_limit = 1;
2338 route->path_rec->reversible = 1;
2339 route->path_rec->pkey = cpu_to_be16(0xffff);
2340 route->path_rec->mtu_selector = IB_SA_EQ;
2341 route->path_rec->sl = iboe_tos_to_sl(ndev, id_priv->tos);
2342 route->path_rec->mtu = iboe_get_mtu(ndev->mtu);
2343 route->path_rec->rate_selector = IB_SA_EQ;
2344 route->path_rec->rate = iboe_get_rate(ndev);
2345 dev_put(ndev);
2346 route->path_rec->packet_life_time_selector = IB_SA_EQ;
2347 route->path_rec->packet_life_time = CMA_IBOE_PACKET_LIFETIME;
2348 if (!route->path_rec->mtu) {
2349 ret = -EINVAL;
2350 goto err2;
2351 }
2352
2353 work->old_state = RDMA_CM_ROUTE_QUERY;
2354 work->new_state = RDMA_CM_ROUTE_RESOLVED;
2355 work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
2356 work->event.status = 0;
2357
2358 queue_work(cma_wq, &work->work);
2359
2360 return 0;
2361
2362 err2:
2363 kfree(route->path_rec);
2364 route->path_rec = NULL;
2365 err1:
2366 kfree(work);
2367 return ret;
2368 }
2369
2370 int rdma_resolve_route(struct rdma_cm_id *id, int timeout_ms)
2371 {
2372 struct rdma_id_private *id_priv;
2373 int ret;
2374
2375 id_priv = container_of(id, struct rdma_id_private, id);
2376 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED, RDMA_CM_ROUTE_QUERY))
2377 return -EINVAL;
2378
2379 atomic_inc(&id_priv->refcount);
2380 if (rdma_cap_ib_sa(id->device, id->port_num))
2381 ret = cma_resolve_ib_route(id_priv, timeout_ms);
2382 else if (rdma_protocol_roce(id->device, id->port_num))
2383 ret = cma_resolve_iboe_route(id_priv);
2384 else if (rdma_protocol_iwarp(id->device, id->port_num))
2385 ret = cma_resolve_iw_route(id_priv, timeout_ms);
2386 else
2387 ret = -ENOSYS;
2388
2389 if (ret)
2390 goto err;
2391
2392 return 0;
2393 err:
2394 cma_comp_exch(id_priv, RDMA_CM_ROUTE_QUERY, RDMA_CM_ADDR_RESOLVED);
2395 cma_deref_id(id_priv);
2396 return ret;
2397 }
2398 EXPORT_SYMBOL(rdma_resolve_route);
2399
2400 static void cma_set_loopback(struct sockaddr *addr)
2401 {
2402 switch (addr->sa_family) {
2403 case AF_INET:
2404 ((struct sockaddr_in *) addr)->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
2405 break;
2406 case AF_INET6:
2407 ipv6_addr_set(&((struct sockaddr_in6 *) addr)->sin6_addr,
2408 0, 0, 0, htonl(1));
2409 break;
2410 default:
2411 ib_addr_set(&((struct sockaddr_ib *) addr)->sib_addr,
2412 0, 0, 0, htonl(1));
2413 break;
2414 }
2415 }
2416
2417 static int cma_bind_loopback(struct rdma_id_private *id_priv)
2418 {
2419 struct cma_device *cma_dev, *cur_dev;
2420 struct ib_port_attr port_attr;
2421 union ib_gid gid;
2422 u16 pkey;
2423 int ret;
2424 u8 p;
2425
2426 cma_dev = NULL;
2427 mutex_lock(&lock);
2428 list_for_each_entry(cur_dev, &dev_list, list) {
2429 if (cma_family(id_priv) == AF_IB &&
2430 !rdma_cap_ib_cm(cur_dev->device, 1))
2431 continue;
2432
2433 if (!cma_dev)
2434 cma_dev = cur_dev;
2435
2436 for (p = 1; p <= cur_dev->device->phys_port_cnt; ++p) {
2437 if (!ib_query_port(cur_dev->device, p, &port_attr) &&
2438 port_attr.state == IB_PORT_ACTIVE) {
2439 cma_dev = cur_dev;
2440 goto port_found;
2441 }
2442 }
2443 }
2444
2445 if (!cma_dev) {
2446 ret = -ENODEV;
2447 goto out;
2448 }
2449
2450 p = 1;
2451
2452 port_found:
2453 ret = ib_get_cached_gid(cma_dev->device, p, 0, &gid, NULL);
2454 if (ret)
2455 goto out;
2456
2457 ret = ib_get_cached_pkey(cma_dev->device, p, 0, &pkey);
2458 if (ret)
2459 goto out;
2460
2461 id_priv->id.route.addr.dev_addr.dev_type =
2462 (rdma_protocol_ib(cma_dev->device, p)) ?
2463 ARPHRD_INFINIBAND : ARPHRD_ETHER;
2464
2465 rdma_addr_set_sgid(&id_priv->id.route.addr.dev_addr, &gid);
2466 ib_addr_set_pkey(&id_priv->id.route.addr.dev_addr, pkey);
2467 id_priv->id.port_num = p;
2468 cma_attach_to_dev(id_priv, cma_dev);
2469 cma_set_loopback(cma_src_addr(id_priv));
2470 out:
2471 mutex_unlock(&lock);
2472 return ret;
2473 }
2474
2475 static void addr_handler(int status, struct sockaddr *src_addr,
2476 struct rdma_dev_addr *dev_addr, void *context)
2477 {
2478 struct rdma_id_private *id_priv = context;
2479 struct rdma_cm_event event;
2480
2481 memset(&event, 0, sizeof event);
2482 mutex_lock(&id_priv->handler_mutex);
2483 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY,
2484 RDMA_CM_ADDR_RESOLVED))
2485 goto out;
2486
2487 memcpy(cma_src_addr(id_priv), src_addr, rdma_addr_size(src_addr));
2488 if (!status && !id_priv->cma_dev)
2489 status = cma_acquire_dev(id_priv, NULL);
2490
2491 if (status) {
2492 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED,
2493 RDMA_CM_ADDR_BOUND))
2494 goto out;
2495 event.event = RDMA_CM_EVENT_ADDR_ERROR;
2496 event.status = status;
2497 } else
2498 event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
2499
2500 if (id_priv->id.event_handler(&id_priv->id, &event)) {
2501 cma_exch(id_priv, RDMA_CM_DESTROYING);
2502 mutex_unlock(&id_priv->handler_mutex);
2503 cma_deref_id(id_priv);
2504 rdma_destroy_id(&id_priv->id);
2505 return;
2506 }
2507 out:
2508 mutex_unlock(&id_priv->handler_mutex);
2509 cma_deref_id(id_priv);
2510 }
2511
2512 static int cma_resolve_loopback(struct rdma_id_private *id_priv)
2513 {
2514 struct cma_work *work;
2515 union ib_gid gid;
2516 int ret;
2517
2518 work = kzalloc(sizeof *work, GFP_KERNEL);
2519 if (!work)
2520 return -ENOMEM;
2521
2522 if (!id_priv->cma_dev) {
2523 ret = cma_bind_loopback(id_priv);
2524 if (ret)
2525 goto err;
2526 }
2527
2528 rdma_addr_get_sgid(&id_priv->id.route.addr.dev_addr, &gid);
2529 rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, &gid);
2530
2531 work->id = id_priv;
2532 INIT_WORK(&work->work, cma_work_handler);
2533 work->old_state = RDMA_CM_ADDR_QUERY;
2534 work->new_state = RDMA_CM_ADDR_RESOLVED;
2535 work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
2536 queue_work(cma_wq, &work->work);
2537 return 0;
2538 err:
2539 kfree(work);
2540 return ret;
2541 }
2542
2543 static int cma_resolve_ib_addr(struct rdma_id_private *id_priv)
2544 {
2545 struct cma_work *work;
2546 int ret;
2547
2548 work = kzalloc(sizeof *work, GFP_KERNEL);
2549 if (!work)
2550 return -ENOMEM;
2551
2552 if (!id_priv->cma_dev) {
2553 ret = cma_resolve_ib_dev(id_priv);
2554 if (ret)
2555 goto err;
2556 }
2557
2558 rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, (union ib_gid *)
2559 &(((struct sockaddr_ib *) &id_priv->id.route.addr.dst_addr)->sib_addr));
2560
2561 work->id = id_priv;
2562 INIT_WORK(&work->work, cma_work_handler);
2563 work->old_state = RDMA_CM_ADDR_QUERY;
2564 work->new_state = RDMA_CM_ADDR_RESOLVED;
2565 work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
2566 queue_work(cma_wq, &work->work);
2567 return 0;
2568 err:
2569 kfree(work);
2570 return ret;
2571 }
2572
2573 static int cma_bind_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
2574 struct sockaddr *dst_addr)
2575 {
2576 if (!src_addr || !src_addr->sa_family) {
2577 src_addr = (struct sockaddr *) &id->route.addr.src_addr;
2578 src_addr->sa_family = dst_addr->sa_family;
2579 if (dst_addr->sa_family == AF_INET6) {
2580 struct sockaddr_in6 *src_addr6 = (struct sockaddr_in6 *) src_addr;
2581 struct sockaddr_in6 *dst_addr6 = (struct sockaddr_in6 *) dst_addr;
2582 src_addr6->sin6_scope_id = dst_addr6->sin6_scope_id;
2583 if (ipv6_addr_type(&dst_addr6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
2584 id->route.addr.dev_addr.bound_dev_if = dst_addr6->sin6_scope_id;
2585 } else if (dst_addr->sa_family == AF_IB) {
2586 ((struct sockaddr_ib *) src_addr)->sib_pkey =
2587 ((struct sockaddr_ib *) dst_addr)->sib_pkey;
2588 }
2589 }
2590 return rdma_bind_addr(id, src_addr);
2591 }
2592
2593 int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
2594 struct sockaddr *dst_addr, int timeout_ms)
2595 {
2596 struct rdma_id_private *id_priv;
2597 int ret;
2598
2599 id_priv = container_of(id, struct rdma_id_private, id);
2600 if (id_priv->state == RDMA_CM_IDLE) {
2601 ret = cma_bind_addr(id, src_addr, dst_addr);
2602 if (ret)
2603 return ret;
2604 }
2605
2606 if (cma_family(id_priv) != dst_addr->sa_family)
2607 return -EINVAL;
2608
2609 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_ADDR_QUERY))
2610 return -EINVAL;
2611
2612 atomic_inc(&id_priv->refcount);
2613 memcpy(cma_dst_addr(id_priv), dst_addr, rdma_addr_size(dst_addr));
2614 if (cma_any_addr(dst_addr)) {
2615 ret = cma_resolve_loopback(id_priv);
2616 } else {
2617 if (dst_addr->sa_family == AF_IB) {
2618 ret = cma_resolve_ib_addr(id_priv);
2619 } else {
2620 ret = rdma_resolve_ip(&addr_client, cma_src_addr(id_priv),
2621 dst_addr, &id->route.addr.dev_addr,
2622 timeout_ms, addr_handler, id_priv);
2623 }
2624 }
2625 if (ret)
2626 goto err;
2627
2628 return 0;
2629 err:
2630 cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY, RDMA_CM_ADDR_BOUND);
2631 cma_deref_id(id_priv);
2632 return ret;
2633 }
2634 EXPORT_SYMBOL(rdma_resolve_addr);
2635
2636 int rdma_set_reuseaddr(struct rdma_cm_id *id, int reuse)
2637 {
2638 struct rdma_id_private *id_priv;
2639 unsigned long flags;
2640 int ret;
2641
2642 id_priv = container_of(id, struct rdma_id_private, id);
2643 spin_lock_irqsave(&id_priv->lock, flags);
2644 if (reuse || id_priv->state == RDMA_CM_IDLE) {
2645 id_priv->reuseaddr = reuse;
2646 ret = 0;
2647 } else {
2648 ret = -EINVAL;
2649 }
2650 spin_unlock_irqrestore(&id_priv->lock, flags);
2651 return ret;
2652 }
2653 EXPORT_SYMBOL(rdma_set_reuseaddr);
2654
2655 int rdma_set_afonly(struct rdma_cm_id *id, int afonly)
2656 {
2657 struct rdma_id_private *id_priv;
2658 unsigned long flags;
2659 int ret;
2660
2661 id_priv = container_of(id, struct rdma_id_private, id);
2662 spin_lock_irqsave(&id_priv->lock, flags);
2663 if (id_priv->state == RDMA_CM_IDLE || id_priv->state == RDMA_CM_ADDR_BOUND) {
2664 id_priv->options |= (1 << CMA_OPTION_AFONLY);
2665 id_priv->afonly = afonly;
2666 ret = 0;
2667 } else {
2668 ret = -EINVAL;
2669 }
2670 spin_unlock_irqrestore(&id_priv->lock, flags);
2671 return ret;
2672 }
2673 EXPORT_SYMBOL(rdma_set_afonly);
2674
2675 static void cma_bind_port(struct rdma_bind_list *bind_list,
2676 struct rdma_id_private *id_priv)
2677 {
2678 struct sockaddr *addr;
2679 struct sockaddr_ib *sib;
2680 u64 sid, mask;
2681 __be16 port;
2682
2683 addr = cma_src_addr(id_priv);
2684 port = htons(bind_list->port);
2685
2686 switch (addr->sa_family) {
2687 case AF_INET:
2688 ((struct sockaddr_in *) addr)->sin_port = port;
2689 break;
2690 case AF_INET6:
2691 ((struct sockaddr_in6 *) addr)->sin6_port = port;
2692 break;
2693 case AF_IB:
2694 sib = (struct sockaddr_ib *) addr;
2695 sid = be64_to_cpu(sib->sib_sid);
2696 mask = be64_to_cpu(sib->sib_sid_mask);
2697 sib->sib_sid = cpu_to_be64((sid & mask) | (u64) ntohs(port));
2698 sib->sib_sid_mask = cpu_to_be64(~0ULL);
2699 break;
2700 }
2701 id_priv->bind_list = bind_list;
2702 hlist_add_head(&id_priv->node, &bind_list->owners);
2703 }
2704
2705 static int cma_alloc_port(enum rdma_port_space ps,
2706 struct rdma_id_private *id_priv, unsigned short snum)
2707 {
2708 struct rdma_bind_list *bind_list;
2709 int ret;
2710
2711 bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL);
2712 if (!bind_list)
2713 return -ENOMEM;
2714
2715 ret = cma_ps_alloc(id_priv->id.route.addr.dev_addr.net, ps, bind_list,
2716 snum);
2717 if (ret < 0)
2718 goto err;
2719
2720 bind_list->ps = ps;
2721 bind_list->port = (unsigned short)ret;
2722 cma_bind_port(bind_list, id_priv);
2723 return 0;
2724 err:
2725 kfree(bind_list);
2726 return ret == -ENOSPC ? -EADDRNOTAVAIL : ret;
2727 }
2728
2729 static int cma_alloc_any_port(enum rdma_port_space ps,
2730 struct rdma_id_private *id_priv)
2731 {
2732 static unsigned int last_used_port;
2733 int low, high, remaining;
2734 unsigned int rover;
2735 struct net *net = id_priv->id.route.addr.dev_addr.net;
2736
2737 inet_get_local_port_range(net, &low, &high);
2738 remaining = (high - low) + 1;
2739 rover = prandom_u32() % remaining + low;
2740 retry:
2741 if (last_used_port != rover &&
2742 !cma_ps_find(net, ps, (unsigned short)rover)) {
2743 int ret = cma_alloc_port(ps, id_priv, rover);
2744 /*
2745 * Remember previously used port number in order to avoid
2746 * re-using same port immediately after it is closed.
2747 */
2748 if (!ret)
2749 last_used_port = rover;
2750 if (ret != -EADDRNOTAVAIL)
2751 return ret;
2752 }
2753 if (--remaining) {
2754 rover++;
2755 if ((rover < low) || (rover > high))
2756 rover = low;
2757 goto retry;
2758 }
2759 return -EADDRNOTAVAIL;
2760 }
2761
2762 /*
2763 * Check that the requested port is available. This is called when trying to
2764 * bind to a specific port, or when trying to listen on a bound port. In
2765 * the latter case, the provided id_priv may already be on the bind_list, but
2766 * we still need to check that it's okay to start listening.
2767 */
2768 static int cma_check_port(struct rdma_bind_list *bind_list,
2769 struct rdma_id_private *id_priv, uint8_t reuseaddr)
2770 {
2771 struct rdma_id_private *cur_id;
2772 struct sockaddr *addr, *cur_addr;
2773
2774 addr = cma_src_addr(id_priv);
2775 hlist_for_each_entry(cur_id, &bind_list->owners, node) {
2776 if (id_priv == cur_id)
2777 continue;
2778
2779 if ((cur_id->state != RDMA_CM_LISTEN) && reuseaddr &&
2780 cur_id->reuseaddr)
2781 continue;
2782
2783 cur_addr = cma_src_addr(cur_id);
2784 if (id_priv->afonly && cur_id->afonly &&
2785 (addr->sa_family != cur_addr->sa_family))
2786 continue;
2787
2788 if (cma_any_addr(addr) || cma_any_addr(cur_addr))
2789 return -EADDRNOTAVAIL;
2790
2791 if (!cma_addr_cmp(addr, cur_addr))
2792 return -EADDRINUSE;
2793 }
2794 return 0;
2795 }
2796
2797 static int cma_use_port(enum rdma_port_space ps,
2798 struct rdma_id_private *id_priv)
2799 {
2800 struct rdma_bind_list *bind_list;
2801 unsigned short snum;
2802 int ret;
2803
2804 snum = ntohs(cma_port(cma_src_addr(id_priv)));
2805 if (snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
2806 return -EACCES;
2807
2808 bind_list = cma_ps_find(id_priv->id.route.addr.dev_addr.net, ps, snum);
2809 if (!bind_list) {
2810 ret = cma_alloc_port(ps, id_priv, snum);
2811 } else {
2812 ret = cma_check_port(bind_list, id_priv, id_priv->reuseaddr);
2813 if (!ret)
2814 cma_bind_port(bind_list, id_priv);
2815 }
2816 return ret;
2817 }
2818
2819 static int cma_bind_listen(struct rdma_id_private *id_priv)
2820 {
2821 struct rdma_bind_list *bind_list = id_priv->bind_list;
2822 int ret = 0;
2823
2824 mutex_lock(&lock);
2825 if (bind_list->owners.first->next)
2826 ret = cma_check_port(bind_list, id_priv, 0);
2827 mutex_unlock(&lock);
2828 return ret;
2829 }
2830
2831 static enum rdma_port_space cma_select_inet_ps(
2832 struct rdma_id_private *id_priv)
2833 {
2834 switch (id_priv->id.ps) {
2835 case RDMA_PS_TCP:
2836 case RDMA_PS_UDP:
2837 case RDMA_PS_IPOIB:
2838 case RDMA_PS_IB:
2839 return id_priv->id.ps;
2840 default:
2841
2842 return 0;
2843 }
2844 }
2845
2846 static enum rdma_port_space cma_select_ib_ps(struct rdma_id_private *id_priv)
2847 {
2848 enum rdma_port_space ps = 0;
2849 struct sockaddr_ib *sib;
2850 u64 sid_ps, mask, sid;
2851
2852 sib = (struct sockaddr_ib *) cma_src_addr(id_priv);
2853 mask = be64_to_cpu(sib->sib_sid_mask) & RDMA_IB_IP_PS_MASK;
2854 sid = be64_to_cpu(sib->sib_sid) & mask;
2855
2856 if ((id_priv->id.ps == RDMA_PS_IB) && (sid == (RDMA_IB_IP_PS_IB & mask))) {
2857 sid_ps = RDMA_IB_IP_PS_IB;
2858 ps = RDMA_PS_IB;
2859 } else if (((id_priv->id.ps == RDMA_PS_IB) || (id_priv->id.ps == RDMA_PS_TCP)) &&
2860 (sid == (RDMA_IB_IP_PS_TCP & mask))) {
2861 sid_ps = RDMA_IB_IP_PS_TCP;
2862 ps = RDMA_PS_TCP;
2863 } else if (((id_priv->id.ps == RDMA_PS_IB) || (id_priv->id.ps == RDMA_PS_UDP)) &&
2864 (sid == (RDMA_IB_IP_PS_UDP & mask))) {
2865 sid_ps = RDMA_IB_IP_PS_UDP;
2866 ps = RDMA_PS_UDP;
2867 }
2868
2869 if (ps) {
2870 sib->sib_sid = cpu_to_be64(sid_ps | ntohs(cma_port((struct sockaddr *) sib)));
2871 sib->sib_sid_mask = cpu_to_be64(RDMA_IB_IP_PS_MASK |
2872 be64_to_cpu(sib->sib_sid_mask));
2873 }
2874 return ps;
2875 }
2876
2877 static int cma_get_port(struct rdma_id_private *id_priv)
2878 {
2879 enum rdma_port_space ps;
2880 int ret;
2881
2882 if (cma_family(id_priv) != AF_IB)
2883 ps = cma_select_inet_ps(id_priv);
2884 else
2885 ps = cma_select_ib_ps(id_priv);
2886 if (!ps)
2887 return -EPROTONOSUPPORT;
2888
2889 mutex_lock(&lock);
2890 if (cma_any_port(cma_src_addr(id_priv)))
2891 ret = cma_alloc_any_port(ps, id_priv);
2892 else
2893 ret = cma_use_port(ps, id_priv);
2894 mutex_unlock(&lock);
2895
2896 return ret;
2897 }
2898
2899 static int cma_check_linklocal(struct rdma_dev_addr *dev_addr,
2900 struct sockaddr *addr)
2901 {
2902 #if IS_ENABLED(CONFIG_IPV6)
2903 struct sockaddr_in6 *sin6;
2904
2905 if (addr->sa_family != AF_INET6)
2906 return 0;
2907
2908 sin6 = (struct sockaddr_in6 *) addr;
2909
2910 if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
2911 return 0;
2912
2913 if (!sin6->sin6_scope_id)
2914 return -EINVAL;
2915
2916 dev_addr->bound_dev_if = sin6->sin6_scope_id;
2917 #endif
2918 return 0;
2919 }
2920
2921 int rdma_listen(struct rdma_cm_id *id, int backlog)
2922 {
2923 struct rdma_id_private *id_priv;
2924 int ret;
2925
2926 id_priv = container_of(id, struct rdma_id_private, id);
2927 if (id_priv->state == RDMA_CM_IDLE) {
2928 id->route.addr.src_addr.ss_family = AF_INET;
2929 ret = rdma_bind_addr(id, cma_src_addr(id_priv));
2930 if (ret)
2931 return ret;
2932 }
2933
2934 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_LISTEN))
2935 return -EINVAL;
2936
2937 if (id_priv->reuseaddr) {
2938 ret = cma_bind_listen(id_priv);
2939 if (ret)
2940 goto err;
2941 }
2942
2943 id_priv->backlog = backlog;
2944 if (id->device) {
2945 if (rdma_cap_ib_cm(id->device, 1)) {
2946 ret = cma_ib_listen(id_priv);
2947 if (ret)
2948 goto err;
2949 } else if (rdma_cap_iw_cm(id->device, 1)) {
2950 ret = cma_iw_listen(id_priv, backlog);
2951 if (ret)
2952 goto err;
2953 } else {
2954 ret = -ENOSYS;
2955 goto err;
2956 }
2957 } else
2958 cma_listen_on_all(id_priv);
2959
2960 return 0;
2961 err:
2962 id_priv->backlog = 0;
2963 cma_comp_exch(id_priv, RDMA_CM_LISTEN, RDMA_CM_ADDR_BOUND);
2964 return ret;
2965 }
2966 EXPORT_SYMBOL(rdma_listen);
2967
2968 int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr)
2969 {
2970 struct rdma_id_private *id_priv;
2971 int ret;
2972
2973 if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6 &&
2974 addr->sa_family != AF_IB)
2975 return -EAFNOSUPPORT;
2976
2977 id_priv = container_of(id, struct rdma_id_private, id);
2978 if (!cma_comp_exch(id_priv, RDMA_CM_IDLE, RDMA_CM_ADDR_BOUND))
2979 return -EINVAL;
2980
2981 ret = cma_check_linklocal(&id->route.addr.dev_addr, addr);
2982 if (ret)
2983 goto err1;
2984
2985 memcpy(cma_src_addr(id_priv), addr, rdma_addr_size(addr));
2986 if (!cma_any_addr(addr)) {
2987 ret = cma_translate_addr(addr, &id->route.addr.dev_addr);
2988 if (ret)
2989 goto err1;
2990
2991 ret = cma_acquire_dev(id_priv, NULL);
2992 if (ret)
2993 goto err1;
2994 }
2995
2996 if (!(id_priv->options & (1 << CMA_OPTION_AFONLY))) {
2997 if (addr->sa_family == AF_INET)
2998 id_priv->afonly = 1;
2999 #if IS_ENABLED(CONFIG_IPV6)
3000 else if (addr->sa_family == AF_INET6) {
3001 struct net *net = id_priv->id.route.addr.dev_addr.net;
3002
3003 id_priv->afonly = net->ipv6.sysctl.bindv6only;
3004 }
3005 #endif
3006 }
3007 ret = cma_get_port(id_priv);
3008 if (ret)
3009 goto err2;
3010
3011 return 0;
3012 err2:
3013 if (id_priv->cma_dev)
3014 cma_release_dev(id_priv);
3015 err1:
3016 cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_IDLE);
3017 return ret;
3018 }
3019 EXPORT_SYMBOL(rdma_bind_addr);
3020
3021 static int cma_format_hdr(void *hdr, struct rdma_id_private *id_priv)
3022 {
3023 struct cma_hdr *cma_hdr;
3024
3025 cma_hdr = hdr;
3026 cma_hdr->cma_version = CMA_VERSION;
3027 if (cma_family(id_priv) == AF_INET) {
3028 struct sockaddr_in *src4, *dst4;
3029
3030 src4 = (struct sockaddr_in *) cma_src_addr(id_priv);
3031 dst4 = (struct sockaddr_in *) cma_dst_addr(id_priv);
3032
3033 cma_set_ip_ver(cma_hdr, 4);
3034 cma_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
3035 cma_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
3036 cma_hdr->port = src4->sin_port;
3037 } else if (cma_family(id_priv) == AF_INET6) {
3038 struct sockaddr_in6 *src6, *dst6;
3039
3040 src6 = (struct sockaddr_in6 *) cma_src_addr(id_priv);
3041 dst6 = (struct sockaddr_in6 *) cma_dst_addr(id_priv);
3042
3043 cma_set_ip_ver(cma_hdr, 6);
3044 cma_hdr->src_addr.ip6 = src6->sin6_addr;
3045 cma_hdr->dst_addr.ip6 = dst6->sin6_addr;
3046 cma_hdr->port = src6->sin6_port;
3047 }
3048 return 0;
3049 }
3050
3051 static int cma_sidr_rep_handler(struct ib_cm_id *cm_id,
3052 struct ib_cm_event *ib_event)
3053 {
3054 struct rdma_id_private *id_priv = cm_id->context;
3055 struct rdma_cm_event event;
3056 struct ib_cm_sidr_rep_event_param *rep = &ib_event->param.sidr_rep_rcvd;
3057 int ret = 0;
3058
3059 if (cma_disable_callback(id_priv, RDMA_CM_CONNECT))
3060 return 0;
3061
3062 memset(&event, 0, sizeof event);
3063 switch (ib_event->event) {
3064 case IB_CM_SIDR_REQ_ERROR:
3065 event.event = RDMA_CM_EVENT_UNREACHABLE;
3066 event.status = -ETIMEDOUT;
3067 break;
3068 case IB_CM_SIDR_REP_RECEIVED:
3069 event.param.ud.private_data = ib_event->private_data;
3070 event.param.ud.private_data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
3071 if (rep->status != IB_SIDR_SUCCESS) {
3072 event.event = RDMA_CM_EVENT_UNREACHABLE;
3073 event.status = ib_event->param.sidr_rep_rcvd.status;
3074 break;
3075 }
3076 ret = cma_set_qkey(id_priv, rep->qkey);
3077 if (ret) {
3078 event.event = RDMA_CM_EVENT_ADDR_ERROR;
3079 event.status = ret;
3080 break;
3081 }
3082 ib_init_ah_from_path(id_priv->id.device, id_priv->id.port_num,
3083 id_priv->id.route.path_rec,
3084 &event.param.ud.ah_attr);
3085 event.param.ud.qp_num = rep->qpn;
3086 event.param.ud.qkey = rep->qkey;
3087 event.event = RDMA_CM_EVENT_ESTABLISHED;
3088 event.status = 0;
3089 break;
3090 default:
3091 printk(KERN_ERR "RDMA CMA: unexpected IB CM event: %d\n",
3092 ib_event->event);
3093 goto out;
3094 }
3095
3096 ret = id_priv->id.event_handler(&id_priv->id, &event);
3097 if (ret) {
3098 /* Destroy the CM ID by returning a non-zero value. */
3099 id_priv->cm_id.ib = NULL;
3100 cma_exch(id_priv, RDMA_CM_DESTROYING);
3101 mutex_unlock(&id_priv->handler_mutex);
3102 rdma_destroy_id(&id_priv->id);
3103 return ret;
3104 }
3105 out:
3106 mutex_unlock(&id_priv->handler_mutex);
3107 return ret;
3108 }
3109
3110 static int cma_resolve_ib_udp(struct rdma_id_private *id_priv,
3111 struct rdma_conn_param *conn_param)
3112 {
3113 struct ib_cm_sidr_req_param req;
3114 struct ib_cm_id *id;
3115 void *private_data;
3116 int offset, ret;
3117
3118 memset(&req, 0, sizeof req);
3119 offset = cma_user_data_offset(id_priv);
3120 req.private_data_len = offset + conn_param->private_data_len;
3121 if (req.private_data_len < conn_param->private_data_len)
3122 return -EINVAL;
3123
3124 if (req.private_data_len) {
3125 private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
3126 if (!private_data)
3127 return -ENOMEM;
3128 } else {
3129 private_data = NULL;
3130 }
3131
3132 if (conn_param->private_data && conn_param->private_data_len)
3133 memcpy(private_data + offset, conn_param->private_data,
3134 conn_param->private_data_len);
3135
3136 if (private_data) {
3137 ret = cma_format_hdr(private_data, id_priv);
3138 if (ret)
3139 goto out;
3140 req.private_data = private_data;
3141 }
3142
3143 id = ib_create_cm_id(id_priv->id.device, cma_sidr_rep_handler,
3144 id_priv);
3145 if (IS_ERR(id)) {
3146 ret = PTR_ERR(id);
3147 goto out;
3148 }
3149 id_priv->cm_id.ib = id;
3150
3151 req.path = id_priv->id.route.path_rec;
3152 req.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
3153 req.timeout_ms = 1 << (CMA_CM_RESPONSE_TIMEOUT - 8);
3154 req.max_cm_retries = CMA_MAX_CM_RETRIES;
3155
3156 ret = ib_send_cm_sidr_req(id_priv->cm_id.ib, &req);
3157 if (ret) {
3158 ib_destroy_cm_id(id_priv->cm_id.ib);
3159 id_priv->cm_id.ib = NULL;
3160 }
3161 out:
3162 kfree(private_data);
3163 return ret;
3164 }
3165
3166 static int cma_connect_ib(struct rdma_id_private *id_priv,
3167 struct rdma_conn_param *conn_param)
3168 {
3169 struct ib_cm_req_param req;
3170 struct rdma_route *route;
3171 void *private_data;
3172 struct ib_cm_id *id;
3173 int offset, ret;
3174
3175 memset(&req, 0, sizeof req);
3176 offset = cma_user_data_offset(id_priv);
3177 req.private_data_len = offset + conn_param->private_data_len;
3178 if (req.private_data_len < conn_param->private_data_len)
3179 return -EINVAL;
3180
3181 if (req.private_data_len) {
3182 private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
3183 if (!private_data)
3184 return -ENOMEM;
3185 } else {
3186 private_data = NULL;
3187 }
3188
3189 if (conn_param->private_data && conn_param->private_data_len)
3190 memcpy(private_data + offset, conn_param->private_data,
3191 conn_param->private_data_len);
3192
3193 id = ib_create_cm_id(id_priv->id.device, cma_ib_handler, id_priv);
3194 if (IS_ERR(id)) {
3195 ret = PTR_ERR(id);
3196 goto out;
3197 }
3198 id_priv->cm_id.ib = id;
3199
3200 route = &id_priv->id.route;
3201 if (private_data) {
3202 ret = cma_format_hdr(private_data, id_priv);
3203 if (ret)
3204 goto out;
3205 req.private_data = private_data;
3206 }
3207
3208 req.primary_path = &route->path_rec[0];
3209 if (route->num_paths == 2)
3210 req.alternate_path = &route->path_rec[1];
3211
3212 req.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
3213 req.qp_num = id_priv->qp_num;
3214 req.qp_type = id_priv->id.qp_type;
3215 req.starting_psn = id_priv->seq_num;
3216 req.responder_resources = conn_param->responder_resources;
3217 req.initiator_depth = conn_param->initiator_depth;
3218 req.flow_control = conn_param->flow_control;
3219 req.retry_count = min_t(u8, 7, conn_param->retry_count);
3220 req.rnr_retry_count = min_t(u8, 7, conn_param->rnr_retry_count);
3221 req.remote_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
3222 req.local_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
3223 req.max_cm_retries = CMA_MAX_CM_RETRIES;
3224 req.srq = id_priv->srq ? 1 : 0;
3225
3226 ret = ib_send_cm_req(id_priv->cm_id.ib, &req);
3227 out:
3228 if (ret && !IS_ERR(id)) {
3229 ib_destroy_cm_id(id);
3230 id_priv->cm_id.ib = NULL;
3231 }
3232
3233 kfree(private_data);
3234 return ret;
3235 }
3236
3237 static int cma_connect_iw(struct rdma_id_private *id_priv,
3238 struct rdma_conn_param *conn_param)
3239 {
3240 struct iw_cm_id *cm_id;
3241 int ret;
3242 struct iw_cm_conn_param iw_param;
3243
3244 cm_id = iw_create_cm_id(id_priv->id.device, cma_iw_handler, id_priv);
3245 if (IS_ERR(cm_id))
3246 return PTR_ERR(cm_id);
3247
3248 cm_id->tos = id_priv->tos;
3249 id_priv->cm_id.iw = cm_id;
3250
3251 memcpy(&cm_id->local_addr, cma_src_addr(id_priv),
3252 rdma_addr_size(cma_src_addr(id_priv)));
3253 memcpy(&cm_id->remote_addr, cma_dst_addr(id_priv),
3254 rdma_addr_size(cma_dst_addr(id_priv)));
3255
3256 ret = cma_modify_qp_rtr(id_priv, conn_param);
3257 if (ret)
3258 goto out;
3259
3260 if (conn_param) {
3261 iw_param.ord = conn_param->initiator_depth;
3262 iw_param.ird = conn_param->responder_resources;
3263 iw_param.private_data = conn_param->private_data;
3264 iw_param.private_data_len = conn_param->private_data_len;
3265 iw_param.qpn = id_priv->id.qp ? id_priv->qp_num : conn_param->qp_num;
3266 } else {
3267 memset(&iw_param, 0, sizeof iw_param);
3268 iw_param.qpn = id_priv->qp_num;
3269 }
3270 ret = iw_cm_connect(cm_id, &iw_param);
3271 out:
3272 if (ret) {
3273 iw_destroy_cm_id(cm_id);
3274 id_priv->cm_id.iw = NULL;
3275 }
3276 return ret;
3277 }
3278
3279 int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
3280 {
3281 struct rdma_id_private *id_priv;
3282 int ret;
3283
3284 id_priv = container_of(id, struct rdma_id_private, id);
3285 if (!cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_CONNECT))
3286 return -EINVAL;
3287
3288 if (!id->qp) {
3289 id_priv->qp_num = conn_param->qp_num;
3290 id_priv->srq = conn_param->srq;
3291 }
3292
3293 if (rdma_cap_ib_cm(id->device, id->port_num)) {
3294 if (id->qp_type == IB_QPT_UD)
3295 ret = cma_resolve_ib_udp(id_priv, conn_param);
3296 else
3297 ret = cma_connect_ib(id_priv, conn_param);
3298 } else if (rdma_cap_iw_cm(id->device, id->port_num))
3299 ret = cma_connect_iw(id_priv, conn_param);
3300 else
3301 ret = -ENOSYS;
3302 if (ret)
3303 goto err;
3304
3305 return 0;
3306 err:
3307 cma_comp_exch(id_priv, RDMA_CM_CONNECT, RDMA_CM_ROUTE_RESOLVED);
3308 return ret;
3309 }
3310 EXPORT_SYMBOL(rdma_connect);
3311
3312 static int cma_accept_ib(struct rdma_id_private *id_priv,
3313 struct rdma_conn_param *conn_param)
3314 {
3315 struct ib_cm_rep_param rep;
3316 int ret;
3317
3318 ret = cma_modify_qp_rtr(id_priv, conn_param);
3319 if (ret)
3320 goto out;
3321
3322 ret = cma_modify_qp_rts(id_priv, conn_param);
3323 if (ret)
3324 goto out;
3325
3326 memset(&rep, 0, sizeof rep);
3327 rep.qp_num = id_priv->qp_num;
3328 rep.starting_psn = id_priv->seq_num;
3329 rep.private_data = conn_param->private_data;
3330 rep.private_data_len = conn_param->private_data_len;
3331 rep.responder_resources = conn_param->responder_resources;
3332 rep.initiator_depth = conn_param->initiator_depth;
3333 rep.failover_accepted = 0;
3334 rep.flow_control = conn_param->flow_control;
3335 rep.rnr_retry_count = min_t(u8, 7, conn_param->rnr_retry_count);
3336 rep.srq = id_priv->srq ? 1 : 0;
3337
3338 ret = ib_send_cm_rep(id_priv->cm_id.ib, &rep);
3339 out:
3340 return ret;
3341 }
3342
3343 static int cma_accept_iw(struct rdma_id_private *id_priv,
3344 struct rdma_conn_param *conn_param)
3345 {
3346 struct iw_cm_conn_param iw_param;
3347 int ret;
3348
3349 ret = cma_modify_qp_rtr(id_priv, conn_param);
3350 if (ret)
3351 return ret;
3352
3353 iw_param.ord = conn_param->initiator_depth;
3354 iw_param.ird = conn_param->responder_resources;
3355 iw_param.private_data = conn_param->private_data;
3356 iw_param.private_data_len = conn_param->private_data_len;
3357 if (id_priv->id.qp) {
3358 iw_param.qpn = id_priv->qp_num;
3359 } else
3360 iw_param.qpn = conn_param->qp_num;
3361
3362 return iw_cm_accept(id_priv->cm_id.iw, &iw_param);
3363 }
3364
3365 static int cma_send_sidr_rep(struct rdma_id_private *id_priv,
3366 enum ib_cm_sidr_status status, u32 qkey,
3367 const void *private_data, int private_data_len)
3368 {
3369 struct ib_cm_sidr_rep_param rep;
3370 int ret;
3371
3372 memset(&rep, 0, sizeof rep);
3373 rep.status = status;
3374 if (status == IB_SIDR_SUCCESS) {
3375 ret = cma_set_qkey(id_priv, qkey);
3376 if (ret)
3377 return ret;
3378 rep.qp_num = id_priv->qp_num;
3379 rep.qkey = id_priv->qkey;
3380 }
3381 rep.private_data = private_data;
3382 rep.private_data_len = private_data_len;
3383
3384 return ib_send_cm_sidr_rep(id_priv->cm_id.ib, &rep);
3385 }
3386
3387 int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
3388 {
3389 struct rdma_id_private *id_priv;
3390 int ret;
3391
3392 id_priv = container_of(id, struct rdma_id_private, id);
3393
3394 id_priv->owner = task_pid_nr(current);
3395
3396 if (!cma_comp(id_priv, RDMA_CM_CONNECT))
3397 return -EINVAL;
3398
3399 if (!id->qp && conn_param) {
3400 id_priv->qp_num = conn_param->qp_num;
3401 id_priv->srq = conn_param->srq;
3402 }
3403
3404 if (rdma_cap_ib_cm(id->device, id->port_num)) {
3405 if (id->qp_type == IB_QPT_UD) {
3406 if (conn_param)
3407 ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
3408 conn_param->qkey,
3409 conn_param->private_data,
3410 conn_param->private_data_len);
3411 else
3412 ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
3413 0, NULL, 0);
3414 } else {
3415 if (conn_param)
3416 ret = cma_accept_ib(id_priv, conn_param);
3417 else
3418 ret = cma_rep_recv(id_priv);
3419 }
3420 } else if (rdma_cap_iw_cm(id->device, id->port_num))
3421 ret = cma_accept_iw(id_priv, conn_param);
3422 else
3423 ret = -ENOSYS;
3424
3425 if (ret)
3426 goto reject;
3427
3428 return 0;
3429 reject:
3430 cma_modify_qp_err(id_priv);
3431 rdma_reject(id, NULL, 0);
3432 return ret;
3433 }
3434 EXPORT_SYMBOL(rdma_accept);
3435
3436 int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event)
3437 {
3438 struct rdma_id_private *id_priv;
3439 int ret;
3440
3441 id_priv = container_of(id, struct rdma_id_private, id);
3442 if (!id_priv->cm_id.ib)
3443 return -EINVAL;
3444
3445 switch (id->device->node_type) {
3446 case RDMA_NODE_IB_CA:
3447 ret = ib_cm_notify(id_priv->cm_id.ib, event);
3448 break;
3449 default:
3450 ret = 0;
3451 break;
3452 }
3453 return ret;
3454 }
3455 EXPORT_SYMBOL(rdma_notify);
3456
3457 int rdma_reject(struct rdma_cm_id *id, const void *private_data,
3458 u8 private_data_len)
3459 {
3460 struct rdma_id_private *id_priv;
3461 int ret;
3462
3463 id_priv = container_of(id, struct rdma_id_private, id);
3464 if (!id_priv->cm_id.ib)
3465 return -EINVAL;
3466
3467 if (rdma_cap_ib_cm(id->device, id->port_num)) {
3468 if (id->qp_type == IB_QPT_UD)
3469 ret = cma_send_sidr_rep(id_priv, IB_SIDR_REJECT, 0,
3470 private_data, private_data_len);
3471 else
3472 ret = ib_send_cm_rej(id_priv->cm_id.ib,
3473 IB_CM_REJ_CONSUMER_DEFINED, NULL,
3474 0, private_data, private_data_len);
3475 } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
3476 ret = iw_cm_reject(id_priv->cm_id.iw,
3477 private_data, private_data_len);
3478 } else
3479 ret = -ENOSYS;
3480
3481 return ret;
3482 }
3483 EXPORT_SYMBOL(rdma_reject);
3484
3485 int rdma_disconnect(struct rdma_cm_id *id)
3486 {
3487 struct rdma_id_private *id_priv;
3488 int ret;
3489
3490 id_priv = container_of(id, struct rdma_id_private, id);
3491 if (!id_priv->cm_id.ib)
3492 return -EINVAL;
3493
3494 if (rdma_cap_ib_cm(id->device, id->port_num)) {
3495 ret = cma_modify_qp_err(id_priv);
3496 if (ret)
3497 goto out;
3498 /* Initiate or respond to a disconnect. */
3499 if (ib_send_cm_dreq(id_priv->cm_id.ib, NULL, 0))
3500 ib_send_cm_drep(id_priv->cm_id.ib, NULL, 0);
3501 } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
3502 ret = iw_cm_disconnect(id_priv->cm_id.iw, 0);
3503 } else
3504 ret = -EINVAL;
3505
3506 out:
3507 return ret;
3508 }
3509 EXPORT_SYMBOL(rdma_disconnect);
3510
3511 static int cma_ib_mc_handler(int status, struct ib_sa_multicast *multicast)
3512 {
3513 struct rdma_id_private *id_priv;
3514 struct cma_multicast *mc = multicast->context;
3515 struct rdma_cm_event event;
3516 int ret;
3517
3518 id_priv = mc->id_priv;
3519 if (cma_disable_callback(id_priv, RDMA_CM_ADDR_BOUND) &&
3520 cma_disable_callback(id_priv, RDMA_CM_ADDR_RESOLVED))
3521 return 0;
3522
3523 if (!status)
3524 status = cma_set_qkey(id_priv, be32_to_cpu(multicast->rec.qkey));
3525 mutex_lock(&id_priv->qp_mutex);
3526 if (!status && id_priv->id.qp)
3527 status = ib_attach_mcast(id_priv->id.qp, &multicast->rec.mgid,
3528 be16_to_cpu(multicast->rec.mlid));
3529 mutex_unlock(&id_priv->qp_mutex);
3530
3531 memset(&event, 0, sizeof event);
3532 event.status = status;
3533 event.param.ud.private_data = mc->context;
3534 if (!status) {
3535 event.event = RDMA_CM_EVENT_MULTICAST_JOIN;
3536 ib_init_ah_from_mcmember(id_priv->id.device,
3537 id_priv->id.port_num, &multicast->rec,
3538 &event.param.ud.ah_attr);
3539 event.param.ud.qp_num = 0xFFFFFF;
3540 event.param.ud.qkey = be32_to_cpu(multicast->rec.qkey);
3541 } else
3542 event.event = RDMA_CM_EVENT_MULTICAST_ERROR;
3543
3544 ret = id_priv->id.event_handler(&id_priv->id, &event);
3545 if (ret) {
3546 cma_exch(id_priv, RDMA_CM_DESTROYING);
3547 mutex_unlock(&id_priv->handler_mutex);
3548 rdma_destroy_id(&id_priv->id);
3549 return 0;
3550 }
3551
3552 mutex_unlock(&id_priv->handler_mutex);
3553 return 0;
3554 }
3555
3556 static void cma_set_mgid(struct rdma_id_private *id_priv,
3557 struct sockaddr *addr, union ib_gid *mgid)
3558 {
3559 unsigned char mc_map[MAX_ADDR_LEN];
3560 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
3561 struct sockaddr_in *sin = (struct sockaddr_in *) addr;
3562 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) addr;
3563
3564 if (cma_any_addr(addr)) {
3565 memset(mgid, 0, sizeof *mgid);
3566 } else if ((addr->sa_family == AF_INET6) &&
3567 ((be32_to_cpu(sin6->sin6_addr.s6_addr32[0]) & 0xFFF0FFFF) ==
3568 0xFF10A01B)) {
3569 /* IPv6 address is an SA assigned MGID. */
3570 memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
3571 } else if (addr->sa_family == AF_IB) {
3572 memcpy(mgid, &((struct sockaddr_ib *) addr)->sib_addr, sizeof *mgid);
3573 } else if ((addr->sa_family == AF_INET6)) {
3574 ipv6_ib_mc_map(&sin6->sin6_addr, dev_addr->broadcast, mc_map);
3575 if (id_priv->id.ps == RDMA_PS_UDP)
3576 mc_map[7] = 0x01; /* Use RDMA CM signature */
3577 *mgid = *(union ib_gid *) (mc_map + 4);
3578 } else {
3579 ip_ib_mc_map(sin->sin_addr.s_addr, dev_addr->broadcast, mc_map);
3580 if (id_priv->id.ps == RDMA_PS_UDP)
3581 mc_map[7] = 0x01; /* Use RDMA CM signature */
3582 *mgid = *(union ib_gid *) (mc_map + 4);
3583 }
3584 }
3585
3586 static int cma_join_ib_multicast(struct rdma_id_private *id_priv,
3587 struct cma_multicast *mc)
3588 {
3589 struct ib_sa_mcmember_rec rec;
3590 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
3591 ib_sa_comp_mask comp_mask;
3592 int ret;
3593
3594 ib_addr_get_mgid(dev_addr, &rec.mgid);
3595 ret = ib_sa_get_mcmember_rec(id_priv->id.device, id_priv->id.port_num,
3596 &rec.mgid, &rec);
3597 if (ret)
3598 return ret;
3599
3600 ret = cma_set_qkey(id_priv, 0);
3601 if (ret)
3602 return ret;
3603
3604 cma_set_mgid(id_priv, (struct sockaddr *) &mc->addr, &rec.mgid);
3605 rec.qkey = cpu_to_be32(id_priv->qkey);
3606 rdma_addr_get_sgid(dev_addr, &rec.port_gid);
3607 rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
3608 rec.join_state = 1;
3609
3610 comp_mask = IB_SA_MCMEMBER_REC_MGID | IB_SA_MCMEMBER_REC_PORT_GID |
3611 IB_SA_MCMEMBER_REC_PKEY | IB_SA_MCMEMBER_REC_JOIN_STATE |
3612 IB_SA_MCMEMBER_REC_QKEY | IB_SA_MCMEMBER_REC_SL |
3613 IB_SA_MCMEMBER_REC_FLOW_LABEL |
3614 IB_SA_MCMEMBER_REC_TRAFFIC_CLASS;
3615
3616 if (id_priv->id.ps == RDMA_PS_IPOIB)
3617 comp_mask |= IB_SA_MCMEMBER_REC_RATE |
3618 IB_SA_MCMEMBER_REC_RATE_SELECTOR |
3619 IB_SA_MCMEMBER_REC_MTU_SELECTOR |
3620 IB_SA_MCMEMBER_REC_MTU |
3621 IB_SA_MCMEMBER_REC_HOP_LIMIT;
3622
3623 mc->multicast.ib = ib_sa_join_multicast(&sa_client, id_priv->id.device,
3624 id_priv->id.port_num, &rec,
3625 comp_mask, GFP_KERNEL,
3626 cma_ib_mc_handler, mc);
3627 return PTR_ERR_OR_ZERO(mc->multicast.ib);
3628 }
3629
3630 static void iboe_mcast_work_handler(struct work_struct *work)
3631 {
3632 struct iboe_mcast_work *mw = container_of(work, struct iboe_mcast_work, work);
3633 struct cma_multicast *mc = mw->mc;
3634 struct ib_sa_multicast *m = mc->multicast.ib;
3635
3636 mc->multicast.ib->context = mc;
3637 cma_ib_mc_handler(0, m);
3638 kref_put(&mc->mcref, release_mc);
3639 kfree(mw);
3640 }
3641
3642 static void cma_iboe_set_mgid(struct sockaddr *addr, union ib_gid *mgid)
3643 {
3644 struct sockaddr_in *sin = (struct sockaddr_in *)addr;
3645 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr;
3646
3647 if (cma_any_addr(addr)) {
3648 memset(mgid, 0, sizeof *mgid);
3649 } else if (addr->sa_family == AF_INET6) {
3650 memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
3651 } else {
3652 mgid->raw[0] = 0xff;
3653 mgid->raw[1] = 0x0e;
3654 mgid->raw[2] = 0;
3655 mgid->raw[3] = 0;
3656 mgid->raw[4] = 0;
3657 mgid->raw[5] = 0;
3658 mgid->raw[6] = 0;
3659 mgid->raw[7] = 0;
3660 mgid->raw[8] = 0;
3661 mgid->raw[9] = 0;
3662 mgid->raw[10] = 0xff;
3663 mgid->raw[11] = 0xff;
3664 *(__be32 *)(&mgid->raw[12]) = sin->sin_addr.s_addr;
3665 }
3666 }
3667
3668 static int cma_iboe_join_multicast(struct rdma_id_private *id_priv,
3669 struct cma_multicast *mc)
3670 {
3671 struct iboe_mcast_work *work;
3672 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
3673 int err;
3674 struct sockaddr *addr = (struct sockaddr *)&mc->addr;
3675 struct net_device *ndev = NULL;
3676
3677 if (cma_zero_addr((struct sockaddr *)&mc->addr))
3678 return -EINVAL;
3679
3680 work = kzalloc(sizeof *work, GFP_KERNEL);
3681 if (!work)
3682 return -ENOMEM;
3683
3684 mc->multicast.ib = kzalloc(sizeof(struct ib_sa_multicast), GFP_KERNEL);
3685 if (!mc->multicast.ib) {
3686 err = -ENOMEM;
3687 goto out1;
3688 }
3689
3690 cma_iboe_set_mgid(addr, &mc->multicast.ib->rec.mgid);
3691
3692 mc->multicast.ib->rec.pkey = cpu_to_be16(0xffff);
3693 if (id_priv->id.ps == RDMA_PS_UDP)
3694 mc->multicast.ib->rec.qkey = cpu_to_be32(RDMA_UDP_QKEY);
3695
3696 if (dev_addr->bound_dev_if)
3697 ndev = dev_get_by_index(&init_net, dev_addr->bound_dev_if);
3698 if (!ndev) {
3699 err = -ENODEV;
3700 goto out2;
3701 }
3702 mc->multicast.ib->rec.rate = iboe_get_rate(ndev);
3703 mc->multicast.ib->rec.hop_limit = 1;
3704 mc->multicast.ib->rec.mtu = iboe_get_mtu(ndev->mtu);
3705 dev_put(ndev);
3706 if (!mc->multicast.ib->rec.mtu) {
3707 err = -EINVAL;
3708 goto out2;
3709 }
3710 rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
3711 &mc->multicast.ib->rec.port_gid);
3712 work->id = id_priv;
3713 work->mc = mc;
3714 INIT_WORK(&work->work, iboe_mcast_work_handler);
3715 kref_get(&mc->mcref);
3716 queue_work(cma_wq, &work->work);
3717
3718 return 0;
3719
3720 out2:
3721 kfree(mc->multicast.ib);
3722 out1:
3723 kfree(work);
3724 return err;
3725 }
3726
3727 int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
3728 void *context)
3729 {
3730 struct rdma_id_private *id_priv;
3731 struct cma_multicast *mc;
3732 int ret;
3733
3734 id_priv = container_of(id, struct rdma_id_private, id);
3735 if (!cma_comp(id_priv, RDMA_CM_ADDR_BOUND) &&
3736 !cma_comp(id_priv, RDMA_CM_ADDR_RESOLVED))
3737 return -EINVAL;
3738
3739 mc = kmalloc(sizeof *mc, GFP_KERNEL);
3740 if (!mc)
3741 return -ENOMEM;
3742
3743 memcpy(&mc->addr, addr, rdma_addr_size(addr));
3744 mc->context = context;
3745 mc->id_priv = id_priv;
3746
3747 spin_lock(&id_priv->lock);
3748 list_add(&mc->list, &id_priv->mc_list);
3749 spin_unlock(&id_priv->lock);
3750
3751 if (rdma_protocol_roce(id->device, id->port_num)) {
3752 kref_init(&mc->mcref);
3753 ret = cma_iboe_join_multicast(id_priv, mc);
3754 } else if (rdma_cap_ib_mcast(id->device, id->port_num))
3755 ret = cma_join_ib_multicast(id_priv, mc);
3756 else
3757 ret = -ENOSYS;
3758
3759 if (ret) {
3760 spin_lock_irq(&id_priv->lock);
3761 list_del(&mc->list);
3762 spin_unlock_irq(&id_priv->lock);
3763 kfree(mc);
3764 }
3765 return ret;
3766 }
3767 EXPORT_SYMBOL(rdma_join_multicast);
3768
3769 void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr)
3770 {
3771 struct rdma_id_private *id_priv;
3772 struct cma_multicast *mc;
3773
3774 id_priv = container_of(id, struct rdma_id_private, id);
3775 spin_lock_irq(&id_priv->lock);
3776 list_for_each_entry(mc, &id_priv->mc_list, list) {
3777 if (!memcmp(&mc->addr, addr, rdma_addr_size(addr))) {
3778 list_del(&mc->list);
3779 spin_unlock_irq(&id_priv->lock);
3780
3781 if (id->qp)
3782 ib_detach_mcast(id->qp,
3783 &mc->multicast.ib->rec.mgid,
3784 be16_to_cpu(mc->multicast.ib->rec.mlid));
3785
3786 BUG_ON(id_priv->cma_dev->device != id->device);
3787
3788 if (rdma_cap_ib_mcast(id->device, id->port_num)) {
3789 ib_sa_free_multicast(mc->multicast.ib);
3790 kfree(mc);
3791 } else if (rdma_protocol_roce(id->device, id->port_num))
3792 kref_put(&mc->mcref, release_mc);
3793
3794 return;
3795 }
3796 }
3797 spin_unlock_irq(&id_priv->lock);
3798 }
3799 EXPORT_SYMBOL(rdma_leave_multicast);
3800
3801 static int cma_netdev_change(struct net_device *ndev, struct rdma_id_private *id_priv)
3802 {
3803 struct rdma_dev_addr *dev_addr;
3804 struct cma_ndev_work *work;
3805
3806 dev_addr = &id_priv->id.route.addr.dev_addr;
3807
3808 if ((dev_addr->bound_dev_if == ndev->ifindex) &&
3809 (net_eq(dev_net(ndev), dev_addr->net)) &&
3810 memcmp(dev_addr->src_dev_addr, ndev->dev_addr, ndev->addr_len)) {
3811 printk(KERN_INFO "RDMA CM addr change for ndev %s used by id %p\n",
3812 ndev->name, &id_priv->id);
3813 work = kzalloc(sizeof *work, GFP_KERNEL);
3814 if (!work)
3815 return -ENOMEM;
3816
3817 INIT_WORK(&work->work, cma_ndev_work_handler);
3818 work->id = id_priv;
3819 work->event.event = RDMA_CM_EVENT_ADDR_CHANGE;
3820 atomic_inc(&id_priv->refcount);
3821 queue_work(cma_wq, &work->work);
3822 }
3823
3824 return 0;
3825 }
3826
3827 static int cma_netdev_callback(struct notifier_block *self, unsigned long event,
3828 void *ptr)
3829 {
3830 struct net_device *ndev = netdev_notifier_info_to_dev(ptr);
3831 struct cma_device *cma_dev;
3832 struct rdma_id_private *id_priv;
3833 int ret = NOTIFY_DONE;
3834
3835 if (event != NETDEV_BONDING_FAILOVER)
3836 return NOTIFY_DONE;
3837
3838 if (!(ndev->flags & IFF_MASTER) || !(ndev->priv_flags & IFF_BONDING))
3839 return NOTIFY_DONE;
3840
3841 mutex_lock(&lock);
3842 list_for_each_entry(cma_dev, &dev_list, list)
3843 list_for_each_entry(id_priv, &cma_dev->id_list, list) {
3844 ret = cma_netdev_change(ndev, id_priv);
3845 if (ret)
3846 goto out;
3847 }
3848
3849 out:
3850 mutex_unlock(&lock);
3851 return ret;
3852 }
3853
3854 static struct notifier_block cma_nb = {
3855 .notifier_call = cma_netdev_callback
3856 };
3857
3858 static void cma_add_one(struct ib_device *device)
3859 {
3860 struct cma_device *cma_dev;
3861 struct rdma_id_private *id_priv;
3862
3863 cma_dev = kmalloc(sizeof *cma_dev, GFP_KERNEL);
3864 if (!cma_dev)
3865 return;
3866
3867 cma_dev->device = device;
3868
3869 init_completion(&cma_dev->comp);
3870 atomic_set(&cma_dev->refcount, 1);
3871 INIT_LIST_HEAD(&cma_dev->id_list);
3872 ib_set_client_data(device, &cma_client, cma_dev);
3873
3874 mutex_lock(&lock);
3875 list_add_tail(&cma_dev->list, &dev_list);
3876 list_for_each_entry(id_priv, &listen_any_list, list)
3877 cma_listen_on_dev(id_priv, cma_dev);
3878 mutex_unlock(&lock);
3879 }
3880
3881 static int cma_remove_id_dev(struct rdma_id_private *id_priv)
3882 {
3883 struct rdma_cm_event event;
3884 enum rdma_cm_state state;
3885 int ret = 0;
3886
3887 /* Record that we want to remove the device */
3888 state = cma_exch(id_priv, RDMA_CM_DEVICE_REMOVAL);
3889 if (state == RDMA_CM_DESTROYING)
3890 return 0;
3891
3892 cma_cancel_operation(id_priv, state);
3893 mutex_lock(&id_priv->handler_mutex);
3894
3895 /* Check for destruction from another callback. */
3896 if (!cma_comp(id_priv, RDMA_CM_DEVICE_REMOVAL))
3897 goto out;
3898
3899 memset(&event, 0, sizeof event);
3900 event.event = RDMA_CM_EVENT_DEVICE_REMOVAL;
3901 ret = id_priv->id.event_handler(&id_priv->id, &event);
3902 out:
3903 mutex_unlock(&id_priv->handler_mutex);
3904 return ret;
3905 }
3906
3907 static void cma_process_remove(struct cma_device *cma_dev)
3908 {
3909 struct rdma_id_private *id_priv;
3910 int ret;
3911
3912 mutex_lock(&lock);
3913 while (!list_empty(&cma_dev->id_list)) {
3914 id_priv = list_entry(cma_dev->id_list.next,
3915 struct rdma_id_private, list);
3916
3917 list_del(&id_priv->listen_list);
3918 list_del_init(&id_priv->list);
3919 atomic_inc(&id_priv->refcount);
3920 mutex_unlock(&lock);
3921
3922 ret = id_priv->internal_id ? 1 : cma_remove_id_dev(id_priv);
3923 cma_deref_id(id_priv);
3924 if (ret)
3925 rdma_destroy_id(&id_priv->id);
3926
3927 mutex_lock(&lock);
3928 }
3929 mutex_unlock(&lock);
3930
3931 cma_deref_dev(cma_dev);
3932 wait_for_completion(&cma_dev->comp);
3933 }
3934
3935 static void cma_remove_one(struct ib_device *device, void *client_data)
3936 {
3937 struct cma_device *cma_dev = client_data;
3938
3939 if (!cma_dev)
3940 return;
3941
3942 mutex_lock(&lock);
3943 list_del(&cma_dev->list);
3944 mutex_unlock(&lock);
3945
3946 cma_process_remove(cma_dev);
3947 kfree(cma_dev);
3948 }
3949
3950 static int cma_get_id_stats(struct sk_buff *skb, struct netlink_callback *cb)
3951 {
3952 struct nlmsghdr *nlh;
3953 struct rdma_cm_id_stats *id_stats;
3954 struct rdma_id_private *id_priv;
3955 struct rdma_cm_id *id = NULL;
3956 struct cma_device *cma_dev;
3957 int i_dev = 0, i_id = 0;
3958
3959 /*
3960 * We export all of the IDs as a sequence of messages. Each
3961 * ID gets its own netlink message.
3962 */
3963 mutex_lock(&lock);
3964
3965 list_for_each_entry(cma_dev, &dev_list, list) {
3966 if (i_dev < cb->args[0]) {
3967 i_dev++;
3968 continue;
3969 }
3970
3971 i_id = 0;
3972 list_for_each_entry(id_priv, &cma_dev->id_list, list) {
3973 if (i_id < cb->args[1]) {
3974 i_id++;
3975 continue;
3976 }
3977
3978 id_stats = ibnl_put_msg(skb, &nlh, cb->nlh->nlmsg_seq,
3979 sizeof *id_stats, RDMA_NL_RDMA_CM,
3980 RDMA_NL_RDMA_CM_ID_STATS,
3981 NLM_F_MULTI);
3982 if (!id_stats)
3983 goto out;
3984
3985 memset(id_stats, 0, sizeof *id_stats);
3986 id = &id_priv->id;
3987 id_stats->node_type = id->route.addr.dev_addr.dev_type;
3988 id_stats->port_num = id->port_num;
3989 id_stats->bound_dev_if =
3990 id->route.addr.dev_addr.bound_dev_if;
3991
3992 if (ibnl_put_attr(skb, nlh,
3993 rdma_addr_size(cma_src_addr(id_priv)),
3994 cma_src_addr(id_priv),
3995 RDMA_NL_RDMA_CM_ATTR_SRC_ADDR))
3996 goto out;
3997 if (ibnl_put_attr(skb, nlh,
3998 rdma_addr_size(cma_src_addr(id_priv)),
3999 cma_dst_addr(id_priv),
4000 RDMA_NL_RDMA_CM_ATTR_DST_ADDR))
4001 goto out;
4002
4003 id_stats->pid = id_priv->owner;
4004 id_stats->port_space = id->ps;
4005 id_stats->cm_state = id_priv->state;
4006 id_stats->qp_num = id_priv->qp_num;
4007 id_stats->qp_type = id->qp_type;
4008
4009 i_id++;
4010 }
4011
4012 cb->args[1] = 0;
4013 i_dev++;
4014 }
4015
4016 out:
4017 mutex_unlock(&lock);
4018 cb->args[0] = i_dev;
4019 cb->args[1] = i_id;
4020
4021 return skb->len;
4022 }
4023
4024 static const struct ibnl_client_cbs cma_cb_table[] = {
4025 [RDMA_NL_RDMA_CM_ID_STATS] = { .dump = cma_get_id_stats,
4026 .module = THIS_MODULE },
4027 };
4028
4029 static int cma_init_net(struct net *net)
4030 {
4031 struct cma_pernet *pernet = cma_pernet(net);
4032
4033 idr_init(&pernet->tcp_ps);
4034 idr_init(&pernet->udp_ps);
4035 idr_init(&pernet->ipoib_ps);
4036 idr_init(&pernet->ib_ps);
4037
4038 return 0;
4039 }
4040
4041 static void cma_exit_net(struct net *net)
4042 {
4043 struct cma_pernet *pernet = cma_pernet(net);
4044
4045 idr_destroy(&pernet->tcp_ps);
4046 idr_destroy(&pernet->udp_ps);
4047 idr_destroy(&pernet->ipoib_ps);
4048 idr_destroy(&pernet->ib_ps);
4049 }
4050
4051 static struct pernet_operations cma_pernet_operations = {
4052 .init = cma_init_net,
4053 .exit = cma_exit_net,
4054 .id = &cma_pernet_id,
4055 .size = sizeof(struct cma_pernet),
4056 };
4057
4058 static int __init cma_init(void)
4059 {
4060 int ret;
4061
4062 cma_wq = create_singlethread_workqueue("rdma_cm");
4063 if (!cma_wq)
4064 return -ENOMEM;
4065
4066 ret = register_pernet_subsys(&cma_pernet_operations);
4067 if (ret)
4068 goto err_wq;
4069
4070 ib_sa_register_client(&sa_client);
4071 rdma_addr_register_client(&addr_client);
4072 register_netdevice_notifier(&cma_nb);
4073
4074 ret = ib_register_client(&cma_client);
4075 if (ret)
4076 goto err;
4077
4078 if (ibnl_add_client(RDMA_NL_RDMA_CM, RDMA_NL_RDMA_CM_NUM_OPS, cma_cb_table))
4079 printk(KERN_WARNING "RDMA CMA: failed to add netlink callback\n");
4080
4081 return 0;
4082
4083 err:
4084 unregister_netdevice_notifier(&cma_nb);
4085 rdma_addr_unregister_client(&addr_client);
4086 ib_sa_unregister_client(&sa_client);
4087 err_wq:
4088 destroy_workqueue(cma_wq);
4089 return ret;
4090 }
4091
4092 static void __exit cma_cleanup(void)
4093 {
4094 ibnl_remove_client(RDMA_NL_RDMA_CM);
4095 ib_unregister_client(&cma_client);
4096 unregister_netdevice_notifier(&cma_nb);
4097 rdma_addr_unregister_client(&addr_client);
4098 ib_sa_unregister_client(&sa_client);
4099 unregister_pernet_subsys(&cma_pernet_operations);
4100 destroy_workqueue(cma_wq);
4101 }
4102
4103 module_init(cma_init);
4104 module_exit(cma_cleanup);
Linux kernel - Deliverables
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