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Merge remote-tracking branch 'mkp-scsi/4.8/scsi-fixes' into fixes
[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/igmp.h>
42 #include <linux/idr.h>
43 #include <linux/inetdevice.h>
44 #include <linux/slab.h>
45 #include <linux/module.h>
46 #include <net/route.h>
47
48 #include <net/net_namespace.h>
49 #include <net/netns/generic.h>
50 #include <net/tcp.h>
51 #include <net/ipv6.h>
52 #include <net/ip_fib.h>
53 #include <net/ip6_route.h>
54
55 #include <rdma/rdma_cm.h>
56 #include <rdma/rdma_cm_ib.h>
57 #include <rdma/rdma_netlink.h>
58 #include <rdma/ib.h>
59 #include <rdma/ib_cache.h>
60 #include <rdma/ib_cm.h>
61 #include <rdma/ib_sa.h>
62 #include <rdma/iw_cm.h>
63
64 #include "core_priv.h"
65
66 MODULE_AUTHOR("Sean Hefty");
67 MODULE_DESCRIPTION("Generic RDMA CM Agent");
68 MODULE_LICENSE("Dual BSD/GPL");
69
70 #define CMA_CM_RESPONSE_TIMEOUT 20
71 #define CMA_QUERY_CLASSPORT_INFO_TIMEOUT 3000
72 #define CMA_MAX_CM_RETRIES 15
73 #define CMA_CM_MRA_SETTING (IB_CM_MRA_FLAG_DELAY | 24)
74 #define CMA_IBOE_PACKET_LIFETIME 18
75
76 static const char * const cma_events[] = {
77 [RDMA_CM_EVENT_ADDR_RESOLVED] = "address resolved",
78 [RDMA_CM_EVENT_ADDR_ERROR] = "address error",
79 [RDMA_CM_EVENT_ROUTE_RESOLVED] = "route resolved ",
80 [RDMA_CM_EVENT_ROUTE_ERROR] = "route error",
81 [RDMA_CM_EVENT_CONNECT_REQUEST] = "connect request",
82 [RDMA_CM_EVENT_CONNECT_RESPONSE] = "connect response",
83 [RDMA_CM_EVENT_CONNECT_ERROR] = "connect error",
84 [RDMA_CM_EVENT_UNREACHABLE] = "unreachable",
85 [RDMA_CM_EVENT_REJECTED] = "rejected",
86 [RDMA_CM_EVENT_ESTABLISHED] = "established",
87 [RDMA_CM_EVENT_DISCONNECTED] = "disconnected",
88 [RDMA_CM_EVENT_DEVICE_REMOVAL] = "device removal",
89 [RDMA_CM_EVENT_MULTICAST_JOIN] = "multicast join",
90 [RDMA_CM_EVENT_MULTICAST_ERROR] = "multicast error",
91 [RDMA_CM_EVENT_ADDR_CHANGE] = "address change",
92 [RDMA_CM_EVENT_TIMEWAIT_EXIT] = "timewait exit",
93 };
94
95 const char *__attribute_const__ rdma_event_msg(enum rdma_cm_event_type event)
96 {
97 size_t index = event;
98
99 return (index < ARRAY_SIZE(cma_events) && cma_events[index]) ?
100 cma_events[index] : "unrecognized event";
101 }
102 EXPORT_SYMBOL(rdma_event_msg);
103
104 static void cma_add_one(struct ib_device *device);
105 static void cma_remove_one(struct ib_device *device, void *client_data);
106
107 static struct ib_client cma_client = {
108 .name = "cma",
109 .add = cma_add_one,
110 .remove = cma_remove_one
111 };
112
113 static struct ib_sa_client sa_client;
114 static struct rdma_addr_client addr_client;
115 static LIST_HEAD(dev_list);
116 static LIST_HEAD(listen_any_list);
117 static DEFINE_MUTEX(lock);
118 static struct workqueue_struct *cma_wq;
119 static int cma_pernet_id;
120
121 struct cma_pernet {
122 struct idr tcp_ps;
123 struct idr udp_ps;
124 struct idr ipoib_ps;
125 struct idr ib_ps;
126 };
127
128 static struct cma_pernet *cma_pernet(struct net *net)
129 {
130 return net_generic(net, cma_pernet_id);
131 }
132
133 static struct idr *cma_pernet_idr(struct net *net, enum rdma_port_space ps)
134 {
135 struct cma_pernet *pernet = cma_pernet(net);
136
137 switch (ps) {
138 case RDMA_PS_TCP:
139 return &pernet->tcp_ps;
140 case RDMA_PS_UDP:
141 return &pernet->udp_ps;
142 case RDMA_PS_IPOIB:
143 return &pernet->ipoib_ps;
144 case RDMA_PS_IB:
145 return &pernet->ib_ps;
146 default:
147 return NULL;
148 }
149 }
150
151 struct cma_device {
152 struct list_head list;
153 struct ib_device *device;
154 struct completion comp;
155 atomic_t refcount;
156 struct list_head id_list;
157 enum ib_gid_type *default_gid_type;
158 };
159
160 struct rdma_bind_list {
161 enum rdma_port_space ps;
162 struct hlist_head owners;
163 unsigned short port;
164 };
165
166 struct class_port_info_context {
167 struct ib_class_port_info *class_port_info;
168 struct ib_device *device;
169 struct completion done;
170 struct ib_sa_query *sa_query;
171 u8 port_num;
172 };
173
174 static int cma_ps_alloc(struct net *net, enum rdma_port_space ps,
175 struct rdma_bind_list *bind_list, int snum)
176 {
177 struct idr *idr = cma_pernet_idr(net, ps);
178
179 return idr_alloc(idr, bind_list, snum, snum + 1, GFP_KERNEL);
180 }
181
182 static struct rdma_bind_list *cma_ps_find(struct net *net,
183 enum rdma_port_space ps, int snum)
184 {
185 struct idr *idr = cma_pernet_idr(net, ps);
186
187 return idr_find(idr, snum);
188 }
189
190 static void cma_ps_remove(struct net *net, enum rdma_port_space ps, int snum)
191 {
192 struct idr *idr = cma_pernet_idr(net, ps);
193
194 idr_remove(idr, snum);
195 }
196
197 enum {
198 CMA_OPTION_AFONLY,
199 };
200
201 void cma_ref_dev(struct cma_device *cma_dev)
202 {
203 atomic_inc(&cma_dev->refcount);
204 }
205
206 struct cma_device *cma_enum_devices_by_ibdev(cma_device_filter filter,
207 void *cookie)
208 {
209 struct cma_device *cma_dev;
210 struct cma_device *found_cma_dev = NULL;
211
212 mutex_lock(&lock);
213
214 list_for_each_entry(cma_dev, &dev_list, list)
215 if (filter(cma_dev->device, cookie)) {
216 found_cma_dev = cma_dev;
217 break;
218 }
219
220 if (found_cma_dev)
221 cma_ref_dev(found_cma_dev);
222 mutex_unlock(&lock);
223 return found_cma_dev;
224 }
225
226 int cma_get_default_gid_type(struct cma_device *cma_dev,
227 unsigned int port)
228 {
229 if (port < rdma_start_port(cma_dev->device) ||
230 port > rdma_end_port(cma_dev->device))
231 return -EINVAL;
232
233 return cma_dev->default_gid_type[port - rdma_start_port(cma_dev->device)];
234 }
235
236 int cma_set_default_gid_type(struct cma_device *cma_dev,
237 unsigned int port,
238 enum ib_gid_type default_gid_type)
239 {
240 unsigned long supported_gids;
241
242 if (port < rdma_start_port(cma_dev->device) ||
243 port > rdma_end_port(cma_dev->device))
244 return -EINVAL;
245
246 supported_gids = roce_gid_type_mask_support(cma_dev->device, port);
247
248 if (!(supported_gids & 1 << default_gid_type))
249 return -EINVAL;
250
251 cma_dev->default_gid_type[port - rdma_start_port(cma_dev->device)] =
252 default_gid_type;
253
254 return 0;
255 }
256
257 struct ib_device *cma_get_ib_dev(struct cma_device *cma_dev)
258 {
259 return cma_dev->device;
260 }
261
262 /*
263 * Device removal can occur at anytime, so we need extra handling to
264 * serialize notifying the user of device removal with other callbacks.
265 * We do this by disabling removal notification while a callback is in process,
266 * and reporting it after the callback completes.
267 */
268 struct rdma_id_private {
269 struct rdma_cm_id id;
270
271 struct rdma_bind_list *bind_list;
272 struct hlist_node node;
273 struct list_head list; /* listen_any_list or cma_device.list */
274 struct list_head listen_list; /* per device listens */
275 struct cma_device *cma_dev;
276 struct list_head mc_list;
277
278 int internal_id;
279 enum rdma_cm_state state;
280 spinlock_t lock;
281 struct mutex qp_mutex;
282
283 struct completion comp;
284 atomic_t refcount;
285 struct mutex handler_mutex;
286
287 int backlog;
288 int timeout_ms;
289 struct ib_sa_query *query;
290 int query_id;
291 union {
292 struct ib_cm_id *ib;
293 struct iw_cm_id *iw;
294 } cm_id;
295
296 u32 seq_num;
297 u32 qkey;
298 u32 qp_num;
299 pid_t owner;
300 u32 options;
301 u8 srq;
302 u8 tos;
303 u8 reuseaddr;
304 u8 afonly;
305 enum ib_gid_type gid_type;
306 };
307
308 struct cma_multicast {
309 struct rdma_id_private *id_priv;
310 union {
311 struct ib_sa_multicast *ib;
312 } multicast;
313 struct list_head list;
314 void *context;
315 struct sockaddr_storage addr;
316 struct kref mcref;
317 bool igmp_joined;
318 u8 join_state;
319 };
320
321 struct cma_work {
322 struct work_struct work;
323 struct rdma_id_private *id;
324 enum rdma_cm_state old_state;
325 enum rdma_cm_state new_state;
326 struct rdma_cm_event event;
327 };
328
329 struct cma_ndev_work {
330 struct work_struct work;
331 struct rdma_id_private *id;
332 struct rdma_cm_event event;
333 };
334
335 struct iboe_mcast_work {
336 struct work_struct work;
337 struct rdma_id_private *id;
338 struct cma_multicast *mc;
339 };
340
341 union cma_ip_addr {
342 struct in6_addr ip6;
343 struct {
344 __be32 pad[3];
345 __be32 addr;
346 } ip4;
347 };
348
349 struct cma_hdr {
350 u8 cma_version;
351 u8 ip_version; /* IP version: 7:4 */
352 __be16 port;
353 union cma_ip_addr src_addr;
354 union cma_ip_addr dst_addr;
355 };
356
357 #define CMA_VERSION 0x00
358
359 struct cma_req_info {
360 struct ib_device *device;
361 int port;
362 union ib_gid local_gid;
363 __be64 service_id;
364 u16 pkey;
365 bool has_gid:1;
366 };
367
368 static int cma_comp(struct rdma_id_private *id_priv, enum rdma_cm_state comp)
369 {
370 unsigned long flags;
371 int ret;
372
373 spin_lock_irqsave(&id_priv->lock, flags);
374 ret = (id_priv->state == comp);
375 spin_unlock_irqrestore(&id_priv->lock, flags);
376 return ret;
377 }
378
379 static int cma_comp_exch(struct rdma_id_private *id_priv,
380 enum rdma_cm_state comp, enum rdma_cm_state exch)
381 {
382 unsigned long flags;
383 int ret;
384
385 spin_lock_irqsave(&id_priv->lock, flags);
386 if ((ret = (id_priv->state == comp)))
387 id_priv->state = exch;
388 spin_unlock_irqrestore(&id_priv->lock, flags);
389 return ret;
390 }
391
392 static enum rdma_cm_state cma_exch(struct rdma_id_private *id_priv,
393 enum rdma_cm_state exch)
394 {
395 unsigned long flags;
396 enum rdma_cm_state old;
397
398 spin_lock_irqsave(&id_priv->lock, flags);
399 old = id_priv->state;
400 id_priv->state = exch;
401 spin_unlock_irqrestore(&id_priv->lock, flags);
402 return old;
403 }
404
405 static inline u8 cma_get_ip_ver(const struct cma_hdr *hdr)
406 {
407 return hdr->ip_version >> 4;
408 }
409
410 static inline void cma_set_ip_ver(struct cma_hdr *hdr, u8 ip_ver)
411 {
412 hdr->ip_version = (ip_ver << 4) | (hdr->ip_version & 0xF);
413 }
414
415 static int cma_igmp_send(struct net_device *ndev, union ib_gid *mgid, bool join)
416 {
417 struct in_device *in_dev = NULL;
418
419 if (ndev) {
420 rtnl_lock();
421 in_dev = __in_dev_get_rtnl(ndev);
422 if (in_dev) {
423 if (join)
424 ip_mc_inc_group(in_dev,
425 *(__be32 *)(mgid->raw + 12));
426 else
427 ip_mc_dec_group(in_dev,
428 *(__be32 *)(mgid->raw + 12));
429 }
430 rtnl_unlock();
431 }
432 return (in_dev) ? 0 : -ENODEV;
433 }
434
435 static void _cma_attach_to_dev(struct rdma_id_private *id_priv,
436 struct cma_device *cma_dev)
437 {
438 cma_ref_dev(cma_dev);
439 id_priv->cma_dev = cma_dev;
440 id_priv->gid_type = 0;
441 id_priv->id.device = cma_dev->device;
442 id_priv->id.route.addr.dev_addr.transport =
443 rdma_node_get_transport(cma_dev->device->node_type);
444 list_add_tail(&id_priv->list, &cma_dev->id_list);
445 }
446
447 static void cma_attach_to_dev(struct rdma_id_private *id_priv,
448 struct cma_device *cma_dev)
449 {
450 _cma_attach_to_dev(id_priv, cma_dev);
451 id_priv->gid_type =
452 cma_dev->default_gid_type[id_priv->id.port_num -
453 rdma_start_port(cma_dev->device)];
454 }
455
456 void cma_deref_dev(struct cma_device *cma_dev)
457 {
458 if (atomic_dec_and_test(&cma_dev->refcount))
459 complete(&cma_dev->comp);
460 }
461
462 static inline void release_mc(struct kref *kref)
463 {
464 struct cma_multicast *mc = container_of(kref, struct cma_multicast, mcref);
465
466 kfree(mc->multicast.ib);
467 kfree(mc);
468 }
469
470 static void cma_release_dev(struct rdma_id_private *id_priv)
471 {
472 mutex_lock(&lock);
473 list_del(&id_priv->list);
474 cma_deref_dev(id_priv->cma_dev);
475 id_priv->cma_dev = NULL;
476 mutex_unlock(&lock);
477 }
478
479 static inline struct sockaddr *cma_src_addr(struct rdma_id_private *id_priv)
480 {
481 return (struct sockaddr *) &id_priv->id.route.addr.src_addr;
482 }
483
484 static inline struct sockaddr *cma_dst_addr(struct rdma_id_private *id_priv)
485 {
486 return (struct sockaddr *) &id_priv->id.route.addr.dst_addr;
487 }
488
489 static inline unsigned short cma_family(struct rdma_id_private *id_priv)
490 {
491 return id_priv->id.route.addr.src_addr.ss_family;
492 }
493
494 static int cma_set_qkey(struct rdma_id_private *id_priv, u32 qkey)
495 {
496 struct ib_sa_mcmember_rec rec;
497 int ret = 0;
498
499 if (id_priv->qkey) {
500 if (qkey && id_priv->qkey != qkey)
501 return -EINVAL;
502 return 0;
503 }
504
505 if (qkey) {
506 id_priv->qkey = qkey;
507 return 0;
508 }
509
510 switch (id_priv->id.ps) {
511 case RDMA_PS_UDP:
512 case RDMA_PS_IB:
513 id_priv->qkey = RDMA_UDP_QKEY;
514 break;
515 case RDMA_PS_IPOIB:
516 ib_addr_get_mgid(&id_priv->id.route.addr.dev_addr, &rec.mgid);
517 ret = ib_sa_get_mcmember_rec(id_priv->id.device,
518 id_priv->id.port_num, &rec.mgid,
519 &rec);
520 if (!ret)
521 id_priv->qkey = be32_to_cpu(rec.qkey);
522 break;
523 default:
524 break;
525 }
526 return ret;
527 }
528
529 static void cma_translate_ib(struct sockaddr_ib *sib, struct rdma_dev_addr *dev_addr)
530 {
531 dev_addr->dev_type = ARPHRD_INFINIBAND;
532 rdma_addr_set_sgid(dev_addr, (union ib_gid *) &sib->sib_addr);
533 ib_addr_set_pkey(dev_addr, ntohs(sib->sib_pkey));
534 }
535
536 static int cma_translate_addr(struct sockaddr *addr, struct rdma_dev_addr *dev_addr)
537 {
538 int ret;
539
540 if (addr->sa_family != AF_IB) {
541 ret = rdma_translate_ip(addr, dev_addr, NULL);
542 } else {
543 cma_translate_ib((struct sockaddr_ib *) addr, dev_addr);
544 ret = 0;
545 }
546
547 return ret;
548 }
549
550 static inline int cma_validate_port(struct ib_device *device, u8 port,
551 enum ib_gid_type gid_type,
552 union ib_gid *gid, int dev_type,
553 int bound_if_index)
554 {
555 int ret = -ENODEV;
556 struct net_device *ndev = NULL;
557
558 if ((dev_type == ARPHRD_INFINIBAND) && !rdma_protocol_ib(device, port))
559 return ret;
560
561 if ((dev_type != ARPHRD_INFINIBAND) && rdma_protocol_ib(device, port))
562 return ret;
563
564 if (dev_type == ARPHRD_ETHER && rdma_protocol_roce(device, port)) {
565 ndev = dev_get_by_index(&init_net, bound_if_index);
566 if (ndev && ndev->flags & IFF_LOOPBACK) {
567 pr_info("detected loopback device\n");
568 dev_put(ndev);
569
570 if (!device->get_netdev)
571 return -EOPNOTSUPP;
572
573 ndev = device->get_netdev(device, port);
574 if (!ndev)
575 return -ENODEV;
576 }
577 } else {
578 gid_type = IB_GID_TYPE_IB;
579 }
580
581 ret = ib_find_cached_gid_by_port(device, gid, gid_type, port,
582 ndev, NULL);
583
584 if (ndev)
585 dev_put(ndev);
586
587 return ret;
588 }
589
590 static int cma_acquire_dev(struct rdma_id_private *id_priv,
591 struct rdma_id_private *listen_id_priv)
592 {
593 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
594 struct cma_device *cma_dev;
595 union ib_gid gid, iboe_gid, *gidp;
596 int ret = -ENODEV;
597 u8 port;
598
599 if (dev_addr->dev_type != ARPHRD_INFINIBAND &&
600 id_priv->id.ps == RDMA_PS_IPOIB)
601 return -EINVAL;
602
603 mutex_lock(&lock);
604 rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
605 &iboe_gid);
606
607 memcpy(&gid, dev_addr->src_dev_addr +
608 rdma_addr_gid_offset(dev_addr), sizeof gid);
609
610 if (listen_id_priv) {
611 cma_dev = listen_id_priv->cma_dev;
612 port = listen_id_priv->id.port_num;
613 gidp = rdma_protocol_roce(cma_dev->device, port) ?
614 &iboe_gid : &gid;
615
616 ret = cma_validate_port(cma_dev->device, port,
617 rdma_protocol_ib(cma_dev->device, port) ?
618 IB_GID_TYPE_IB :
619 listen_id_priv->gid_type, gidp,
620 dev_addr->dev_type,
621 dev_addr->bound_dev_if);
622 if (!ret) {
623 id_priv->id.port_num = port;
624 goto out;
625 }
626 }
627
628 list_for_each_entry(cma_dev, &dev_list, list) {
629 for (port = 1; port <= cma_dev->device->phys_port_cnt; ++port) {
630 if (listen_id_priv &&
631 listen_id_priv->cma_dev == cma_dev &&
632 listen_id_priv->id.port_num == port)
633 continue;
634
635 gidp = rdma_protocol_roce(cma_dev->device, port) ?
636 &iboe_gid : &gid;
637
638 ret = cma_validate_port(cma_dev->device, port,
639 rdma_protocol_ib(cma_dev->device, port) ?
640 IB_GID_TYPE_IB :
641 cma_dev->default_gid_type[port - 1],
642 gidp, dev_addr->dev_type,
643 dev_addr->bound_dev_if);
644 if (!ret) {
645 id_priv->id.port_num = port;
646 goto out;
647 }
648 }
649 }
650
651 out:
652 if (!ret)
653 cma_attach_to_dev(id_priv, cma_dev);
654
655 mutex_unlock(&lock);
656 return ret;
657 }
658
659 /*
660 * Select the source IB device and address to reach the destination IB address.
661 */
662 static int cma_resolve_ib_dev(struct rdma_id_private *id_priv)
663 {
664 struct cma_device *cma_dev, *cur_dev;
665 struct sockaddr_ib *addr;
666 union ib_gid gid, sgid, *dgid;
667 u16 pkey, index;
668 u8 p;
669 int i;
670
671 cma_dev = NULL;
672 addr = (struct sockaddr_ib *) cma_dst_addr(id_priv);
673 dgid = (union ib_gid *) &addr->sib_addr;
674 pkey = ntohs(addr->sib_pkey);
675
676 list_for_each_entry(cur_dev, &dev_list, list) {
677 for (p = 1; p <= cur_dev->device->phys_port_cnt; ++p) {
678 if (!rdma_cap_af_ib(cur_dev->device, p))
679 continue;
680
681 if (ib_find_cached_pkey(cur_dev->device, p, pkey, &index))
682 continue;
683
684 for (i = 0; !ib_get_cached_gid(cur_dev->device, p, i,
685 &gid, NULL);
686 i++) {
687 if (!memcmp(&gid, dgid, sizeof(gid))) {
688 cma_dev = cur_dev;
689 sgid = gid;
690 id_priv->id.port_num = p;
691 goto found;
692 }
693
694 if (!cma_dev && (gid.global.subnet_prefix ==
695 dgid->global.subnet_prefix)) {
696 cma_dev = cur_dev;
697 sgid = gid;
698 id_priv->id.port_num = p;
699 }
700 }
701 }
702 }
703
704 if (!cma_dev)
705 return -ENODEV;
706
707 found:
708 cma_attach_to_dev(id_priv, cma_dev);
709 addr = (struct sockaddr_ib *) cma_src_addr(id_priv);
710 memcpy(&addr->sib_addr, &sgid, sizeof sgid);
711 cma_translate_ib(addr, &id_priv->id.route.addr.dev_addr);
712 return 0;
713 }
714
715 static void cma_deref_id(struct rdma_id_private *id_priv)
716 {
717 if (atomic_dec_and_test(&id_priv->refcount))
718 complete(&id_priv->comp);
719 }
720
721 struct rdma_cm_id *rdma_create_id(struct net *net,
722 rdma_cm_event_handler event_handler,
723 void *context, enum rdma_port_space ps,
724 enum ib_qp_type qp_type)
725 {
726 struct rdma_id_private *id_priv;
727
728 id_priv = kzalloc(sizeof *id_priv, GFP_KERNEL);
729 if (!id_priv)
730 return ERR_PTR(-ENOMEM);
731
732 id_priv->owner = task_pid_nr(current);
733 id_priv->state = RDMA_CM_IDLE;
734 id_priv->id.context = context;
735 id_priv->id.event_handler = event_handler;
736 id_priv->id.ps = ps;
737 id_priv->id.qp_type = qp_type;
738 spin_lock_init(&id_priv->lock);
739 mutex_init(&id_priv->qp_mutex);
740 init_completion(&id_priv->comp);
741 atomic_set(&id_priv->refcount, 1);
742 mutex_init(&id_priv->handler_mutex);
743 INIT_LIST_HEAD(&id_priv->listen_list);
744 INIT_LIST_HEAD(&id_priv->mc_list);
745 get_random_bytes(&id_priv->seq_num, sizeof id_priv->seq_num);
746 id_priv->id.route.addr.dev_addr.net = get_net(net);
747
748 return &id_priv->id;
749 }
750 EXPORT_SYMBOL(rdma_create_id);
751
752 static int cma_init_ud_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
753 {
754 struct ib_qp_attr qp_attr;
755 int qp_attr_mask, ret;
756
757 qp_attr.qp_state = IB_QPS_INIT;
758 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
759 if (ret)
760 return ret;
761
762 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
763 if (ret)
764 return ret;
765
766 qp_attr.qp_state = IB_QPS_RTR;
767 ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE);
768 if (ret)
769 return ret;
770
771 qp_attr.qp_state = IB_QPS_RTS;
772 qp_attr.sq_psn = 0;
773 ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE | IB_QP_SQ_PSN);
774
775 return ret;
776 }
777
778 static int cma_init_conn_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
779 {
780 struct ib_qp_attr qp_attr;
781 int qp_attr_mask, ret;
782
783 qp_attr.qp_state = IB_QPS_INIT;
784 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
785 if (ret)
786 return ret;
787
788 return ib_modify_qp(qp, &qp_attr, qp_attr_mask);
789 }
790
791 int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd,
792 struct ib_qp_init_attr *qp_init_attr)
793 {
794 struct rdma_id_private *id_priv;
795 struct ib_qp *qp;
796 int ret;
797
798 id_priv = container_of(id, struct rdma_id_private, id);
799 if (id->device != pd->device)
800 return -EINVAL;
801
802 qp_init_attr->port_num = id->port_num;
803 qp = ib_create_qp(pd, qp_init_attr);
804 if (IS_ERR(qp))
805 return PTR_ERR(qp);
806
807 if (id->qp_type == IB_QPT_UD)
808 ret = cma_init_ud_qp(id_priv, qp);
809 else
810 ret = cma_init_conn_qp(id_priv, qp);
811 if (ret)
812 goto err;
813
814 id->qp = qp;
815 id_priv->qp_num = qp->qp_num;
816 id_priv->srq = (qp->srq != NULL);
817 return 0;
818 err:
819 ib_destroy_qp(qp);
820 return ret;
821 }
822 EXPORT_SYMBOL(rdma_create_qp);
823
824 void rdma_destroy_qp(struct rdma_cm_id *id)
825 {
826 struct rdma_id_private *id_priv;
827
828 id_priv = container_of(id, struct rdma_id_private, id);
829 mutex_lock(&id_priv->qp_mutex);
830 ib_destroy_qp(id_priv->id.qp);
831 id_priv->id.qp = NULL;
832 mutex_unlock(&id_priv->qp_mutex);
833 }
834 EXPORT_SYMBOL(rdma_destroy_qp);
835
836 static int cma_modify_qp_rtr(struct rdma_id_private *id_priv,
837 struct rdma_conn_param *conn_param)
838 {
839 struct ib_qp_attr qp_attr;
840 int qp_attr_mask, ret;
841 union ib_gid sgid;
842
843 mutex_lock(&id_priv->qp_mutex);
844 if (!id_priv->id.qp) {
845 ret = 0;
846 goto out;
847 }
848
849 /* Need to update QP attributes from default values. */
850 qp_attr.qp_state = IB_QPS_INIT;
851 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
852 if (ret)
853 goto out;
854
855 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
856 if (ret)
857 goto out;
858
859 qp_attr.qp_state = IB_QPS_RTR;
860 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
861 if (ret)
862 goto out;
863
864 ret = ib_query_gid(id_priv->id.device, id_priv->id.port_num,
865 qp_attr.ah_attr.grh.sgid_index, &sgid, NULL);
866 if (ret)
867 goto out;
868
869 BUG_ON(id_priv->cma_dev->device != id_priv->id.device);
870
871 if (conn_param)
872 qp_attr.max_dest_rd_atomic = conn_param->responder_resources;
873 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
874 out:
875 mutex_unlock(&id_priv->qp_mutex);
876 return ret;
877 }
878
879 static int cma_modify_qp_rts(struct rdma_id_private *id_priv,
880 struct rdma_conn_param *conn_param)
881 {
882 struct ib_qp_attr qp_attr;
883 int qp_attr_mask, ret;
884
885 mutex_lock(&id_priv->qp_mutex);
886 if (!id_priv->id.qp) {
887 ret = 0;
888 goto out;
889 }
890
891 qp_attr.qp_state = IB_QPS_RTS;
892 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
893 if (ret)
894 goto out;
895
896 if (conn_param)
897 qp_attr.max_rd_atomic = conn_param->initiator_depth;
898 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
899 out:
900 mutex_unlock(&id_priv->qp_mutex);
901 return ret;
902 }
903
904 static int cma_modify_qp_err(struct rdma_id_private *id_priv)
905 {
906 struct ib_qp_attr qp_attr;
907 int ret;
908
909 mutex_lock(&id_priv->qp_mutex);
910 if (!id_priv->id.qp) {
911 ret = 0;
912 goto out;
913 }
914
915 qp_attr.qp_state = IB_QPS_ERR;
916 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, IB_QP_STATE);
917 out:
918 mutex_unlock(&id_priv->qp_mutex);
919 return ret;
920 }
921
922 static int cma_ib_init_qp_attr(struct rdma_id_private *id_priv,
923 struct ib_qp_attr *qp_attr, int *qp_attr_mask)
924 {
925 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
926 int ret;
927 u16 pkey;
928
929 if (rdma_cap_eth_ah(id_priv->id.device, id_priv->id.port_num))
930 pkey = 0xffff;
931 else
932 pkey = ib_addr_get_pkey(dev_addr);
933
934 ret = ib_find_cached_pkey(id_priv->id.device, id_priv->id.port_num,
935 pkey, &qp_attr->pkey_index);
936 if (ret)
937 return ret;
938
939 qp_attr->port_num = id_priv->id.port_num;
940 *qp_attr_mask = IB_QP_STATE | IB_QP_PKEY_INDEX | IB_QP_PORT;
941
942 if (id_priv->id.qp_type == IB_QPT_UD) {
943 ret = cma_set_qkey(id_priv, 0);
944 if (ret)
945 return ret;
946
947 qp_attr->qkey = id_priv->qkey;
948 *qp_attr_mask |= IB_QP_QKEY;
949 } else {
950 qp_attr->qp_access_flags = 0;
951 *qp_attr_mask |= IB_QP_ACCESS_FLAGS;
952 }
953 return 0;
954 }
955
956 int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
957 int *qp_attr_mask)
958 {
959 struct rdma_id_private *id_priv;
960 int ret = 0;
961
962 id_priv = container_of(id, struct rdma_id_private, id);
963 if (rdma_cap_ib_cm(id->device, id->port_num)) {
964 if (!id_priv->cm_id.ib || (id_priv->id.qp_type == IB_QPT_UD))
965 ret = cma_ib_init_qp_attr(id_priv, qp_attr, qp_attr_mask);
966 else
967 ret = ib_cm_init_qp_attr(id_priv->cm_id.ib, qp_attr,
968 qp_attr_mask);
969
970 if (qp_attr->qp_state == IB_QPS_RTR)
971 qp_attr->rq_psn = id_priv->seq_num;
972 } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
973 if (!id_priv->cm_id.iw) {
974 qp_attr->qp_access_flags = 0;
975 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS;
976 } else
977 ret = iw_cm_init_qp_attr(id_priv->cm_id.iw, qp_attr,
978 qp_attr_mask);
979 } else
980 ret = -ENOSYS;
981
982 return ret;
983 }
984 EXPORT_SYMBOL(rdma_init_qp_attr);
985
986 static inline int cma_zero_addr(struct sockaddr *addr)
987 {
988 switch (addr->sa_family) {
989 case AF_INET:
990 return ipv4_is_zeronet(((struct sockaddr_in *)addr)->sin_addr.s_addr);
991 case AF_INET6:
992 return ipv6_addr_any(&((struct sockaddr_in6 *) addr)->sin6_addr);
993 case AF_IB:
994 return ib_addr_any(&((struct sockaddr_ib *) addr)->sib_addr);
995 default:
996 return 0;
997 }
998 }
999
1000 static inline int cma_loopback_addr(struct sockaddr *addr)
1001 {
1002 switch (addr->sa_family) {
1003 case AF_INET:
1004 return ipv4_is_loopback(((struct sockaddr_in *) addr)->sin_addr.s_addr);
1005 case AF_INET6:
1006 return ipv6_addr_loopback(&((struct sockaddr_in6 *) addr)->sin6_addr);
1007 case AF_IB:
1008 return ib_addr_loopback(&((struct sockaddr_ib *) addr)->sib_addr);
1009 default:
1010 return 0;
1011 }
1012 }
1013
1014 static inline int cma_any_addr(struct sockaddr *addr)
1015 {
1016 return cma_zero_addr(addr) || cma_loopback_addr(addr);
1017 }
1018
1019 static int cma_addr_cmp(struct sockaddr *src, struct sockaddr *dst)
1020 {
1021 if (src->sa_family != dst->sa_family)
1022 return -1;
1023
1024 switch (src->sa_family) {
1025 case AF_INET:
1026 return ((struct sockaddr_in *) src)->sin_addr.s_addr !=
1027 ((struct sockaddr_in *) dst)->sin_addr.s_addr;
1028 case AF_INET6:
1029 return ipv6_addr_cmp(&((struct sockaddr_in6 *) src)->sin6_addr,
1030 &((struct sockaddr_in6 *) dst)->sin6_addr);
1031 default:
1032 return ib_addr_cmp(&((struct sockaddr_ib *) src)->sib_addr,
1033 &((struct sockaddr_ib *) dst)->sib_addr);
1034 }
1035 }
1036
1037 static __be16 cma_port(struct sockaddr *addr)
1038 {
1039 struct sockaddr_ib *sib;
1040
1041 switch (addr->sa_family) {
1042 case AF_INET:
1043 return ((struct sockaddr_in *) addr)->sin_port;
1044 case AF_INET6:
1045 return ((struct sockaddr_in6 *) addr)->sin6_port;
1046 case AF_IB:
1047 sib = (struct sockaddr_ib *) addr;
1048 return htons((u16) (be64_to_cpu(sib->sib_sid) &
1049 be64_to_cpu(sib->sib_sid_mask)));
1050 default:
1051 return 0;
1052 }
1053 }
1054
1055 static inline int cma_any_port(struct sockaddr *addr)
1056 {
1057 return !cma_port(addr);
1058 }
1059
1060 static void cma_save_ib_info(struct sockaddr *src_addr,
1061 struct sockaddr *dst_addr,
1062 struct rdma_cm_id *listen_id,
1063 struct ib_sa_path_rec *path)
1064 {
1065 struct sockaddr_ib *listen_ib, *ib;
1066
1067 listen_ib = (struct sockaddr_ib *) &listen_id->route.addr.src_addr;
1068 if (src_addr) {
1069 ib = (struct sockaddr_ib *)src_addr;
1070 ib->sib_family = AF_IB;
1071 if (path) {
1072 ib->sib_pkey = path->pkey;
1073 ib->sib_flowinfo = path->flow_label;
1074 memcpy(&ib->sib_addr, &path->sgid, 16);
1075 ib->sib_sid = path->service_id;
1076 ib->sib_scope_id = 0;
1077 } else {
1078 ib->sib_pkey = listen_ib->sib_pkey;
1079 ib->sib_flowinfo = listen_ib->sib_flowinfo;
1080 ib->sib_addr = listen_ib->sib_addr;
1081 ib->sib_sid = listen_ib->sib_sid;
1082 ib->sib_scope_id = listen_ib->sib_scope_id;
1083 }
1084 ib->sib_sid_mask = cpu_to_be64(0xffffffffffffffffULL);
1085 }
1086 if (dst_addr) {
1087 ib = (struct sockaddr_ib *)dst_addr;
1088 ib->sib_family = AF_IB;
1089 if (path) {
1090 ib->sib_pkey = path->pkey;
1091 ib->sib_flowinfo = path->flow_label;
1092 memcpy(&ib->sib_addr, &path->dgid, 16);
1093 }
1094 }
1095 }
1096
1097 static void cma_save_ip4_info(struct sockaddr *src_addr,
1098 struct sockaddr *dst_addr,
1099 struct cma_hdr *hdr,
1100 __be16 local_port)
1101 {
1102 struct sockaddr_in *ip4;
1103
1104 if (src_addr) {
1105 ip4 = (struct sockaddr_in *)src_addr;
1106 ip4->sin_family = AF_INET;
1107 ip4->sin_addr.s_addr = hdr->dst_addr.ip4.addr;
1108 ip4->sin_port = local_port;
1109 }
1110
1111 if (dst_addr) {
1112 ip4 = (struct sockaddr_in *)dst_addr;
1113 ip4->sin_family = AF_INET;
1114 ip4->sin_addr.s_addr = hdr->src_addr.ip4.addr;
1115 ip4->sin_port = hdr->port;
1116 }
1117 }
1118
1119 static void cma_save_ip6_info(struct sockaddr *src_addr,
1120 struct sockaddr *dst_addr,
1121 struct cma_hdr *hdr,
1122 __be16 local_port)
1123 {
1124 struct sockaddr_in6 *ip6;
1125
1126 if (src_addr) {
1127 ip6 = (struct sockaddr_in6 *)src_addr;
1128 ip6->sin6_family = AF_INET6;
1129 ip6->sin6_addr = hdr->dst_addr.ip6;
1130 ip6->sin6_port = local_port;
1131 }
1132
1133 if (dst_addr) {
1134 ip6 = (struct sockaddr_in6 *)dst_addr;
1135 ip6->sin6_family = AF_INET6;
1136 ip6->sin6_addr = hdr->src_addr.ip6;
1137 ip6->sin6_port = hdr->port;
1138 }
1139 }
1140
1141 static u16 cma_port_from_service_id(__be64 service_id)
1142 {
1143 return (u16)be64_to_cpu(service_id);
1144 }
1145
1146 static int cma_save_ip_info(struct sockaddr *src_addr,
1147 struct sockaddr *dst_addr,
1148 struct ib_cm_event *ib_event,
1149 __be64 service_id)
1150 {
1151 struct cma_hdr *hdr;
1152 __be16 port;
1153
1154 hdr = ib_event->private_data;
1155 if (hdr->cma_version != CMA_VERSION)
1156 return -EINVAL;
1157
1158 port = htons(cma_port_from_service_id(service_id));
1159
1160 switch (cma_get_ip_ver(hdr)) {
1161 case 4:
1162 cma_save_ip4_info(src_addr, dst_addr, hdr, port);
1163 break;
1164 case 6:
1165 cma_save_ip6_info(src_addr, dst_addr, hdr, port);
1166 break;
1167 default:
1168 return -EAFNOSUPPORT;
1169 }
1170
1171 return 0;
1172 }
1173
1174 static int cma_save_net_info(struct sockaddr *src_addr,
1175 struct sockaddr *dst_addr,
1176 struct rdma_cm_id *listen_id,
1177 struct ib_cm_event *ib_event,
1178 sa_family_t sa_family, __be64 service_id)
1179 {
1180 if (sa_family == AF_IB) {
1181 if (ib_event->event == IB_CM_REQ_RECEIVED)
1182 cma_save_ib_info(src_addr, dst_addr, listen_id,
1183 ib_event->param.req_rcvd.primary_path);
1184 else if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED)
1185 cma_save_ib_info(src_addr, dst_addr, listen_id, NULL);
1186 return 0;
1187 }
1188
1189 return cma_save_ip_info(src_addr, dst_addr, ib_event, service_id);
1190 }
1191
1192 static int cma_save_req_info(const struct ib_cm_event *ib_event,
1193 struct cma_req_info *req)
1194 {
1195 const struct ib_cm_req_event_param *req_param =
1196 &ib_event->param.req_rcvd;
1197 const struct ib_cm_sidr_req_event_param *sidr_param =
1198 &ib_event->param.sidr_req_rcvd;
1199
1200 switch (ib_event->event) {
1201 case IB_CM_REQ_RECEIVED:
1202 req->device = req_param->listen_id->device;
1203 req->port = req_param->port;
1204 memcpy(&req->local_gid, &req_param->primary_path->sgid,
1205 sizeof(req->local_gid));
1206 req->has_gid = true;
1207 req->service_id = req_param->primary_path->service_id;
1208 req->pkey = be16_to_cpu(req_param->primary_path->pkey);
1209 if (req->pkey != req_param->bth_pkey)
1210 pr_warn_ratelimited("RDMA CMA: got different BTH P_Key (0x%x) and primary path P_Key (0x%x)\n"
1211 "RDMA CMA: in the future this may cause the request to be dropped\n",
1212 req_param->bth_pkey, req->pkey);
1213 break;
1214 case IB_CM_SIDR_REQ_RECEIVED:
1215 req->device = sidr_param->listen_id->device;
1216 req->port = sidr_param->port;
1217 req->has_gid = false;
1218 req->service_id = sidr_param->service_id;
1219 req->pkey = sidr_param->pkey;
1220 if (req->pkey != sidr_param->bth_pkey)
1221 pr_warn_ratelimited("RDMA CMA: got different BTH P_Key (0x%x) and SIDR request payload P_Key (0x%x)\n"
1222 "RDMA CMA: in the future this may cause the request to be dropped\n",
1223 sidr_param->bth_pkey, req->pkey);
1224 break;
1225 default:
1226 return -EINVAL;
1227 }
1228
1229 return 0;
1230 }
1231
1232 static bool validate_ipv4_net_dev(struct net_device *net_dev,
1233 const struct sockaddr_in *dst_addr,
1234 const struct sockaddr_in *src_addr)
1235 {
1236 __be32 daddr = dst_addr->sin_addr.s_addr,
1237 saddr = src_addr->sin_addr.s_addr;
1238 struct fib_result res;
1239 struct flowi4 fl4;
1240 int err;
1241 bool ret;
1242
1243 if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) ||
1244 ipv4_is_lbcast(daddr) || ipv4_is_zeronet(saddr) ||
1245 ipv4_is_zeronet(daddr) || ipv4_is_loopback(daddr) ||
1246 ipv4_is_loopback(saddr))
1247 return false;
1248
1249 memset(&fl4, 0, sizeof(fl4));
1250 fl4.flowi4_iif = net_dev->ifindex;
1251 fl4.daddr = daddr;
1252 fl4.saddr = saddr;
1253
1254 rcu_read_lock();
1255 err = fib_lookup(dev_net(net_dev), &fl4, &res, 0);
1256 ret = err == 0 && FIB_RES_DEV(res) == net_dev;
1257 rcu_read_unlock();
1258
1259 return ret;
1260 }
1261
1262 static bool validate_ipv6_net_dev(struct net_device *net_dev,
1263 const struct sockaddr_in6 *dst_addr,
1264 const struct sockaddr_in6 *src_addr)
1265 {
1266 #if IS_ENABLED(CONFIG_IPV6)
1267 const int strict = ipv6_addr_type(&dst_addr->sin6_addr) &
1268 IPV6_ADDR_LINKLOCAL;
1269 struct rt6_info *rt = rt6_lookup(dev_net(net_dev), &dst_addr->sin6_addr,
1270 &src_addr->sin6_addr, net_dev->ifindex,
1271 strict);
1272 bool ret;
1273
1274 if (!rt)
1275 return false;
1276
1277 ret = rt->rt6i_idev->dev == net_dev;
1278 ip6_rt_put(rt);
1279
1280 return ret;
1281 #else
1282 return false;
1283 #endif
1284 }
1285
1286 static bool validate_net_dev(struct net_device *net_dev,
1287 const struct sockaddr *daddr,
1288 const struct sockaddr *saddr)
1289 {
1290 const struct sockaddr_in *daddr4 = (const struct sockaddr_in *)daddr;
1291 const struct sockaddr_in *saddr4 = (const struct sockaddr_in *)saddr;
1292 const struct sockaddr_in6 *daddr6 = (const struct sockaddr_in6 *)daddr;
1293 const struct sockaddr_in6 *saddr6 = (const struct sockaddr_in6 *)saddr;
1294
1295 switch (daddr->sa_family) {
1296 case AF_INET:
1297 return saddr->sa_family == AF_INET &&
1298 validate_ipv4_net_dev(net_dev, daddr4, saddr4);
1299
1300 case AF_INET6:
1301 return saddr->sa_family == AF_INET6 &&
1302 validate_ipv6_net_dev(net_dev, daddr6, saddr6);
1303
1304 default:
1305 return false;
1306 }
1307 }
1308
1309 static struct net_device *cma_get_net_dev(struct ib_cm_event *ib_event,
1310 const struct cma_req_info *req)
1311 {
1312 struct sockaddr_storage listen_addr_storage, src_addr_storage;
1313 struct sockaddr *listen_addr = (struct sockaddr *)&listen_addr_storage,
1314 *src_addr = (struct sockaddr *)&src_addr_storage;
1315 struct net_device *net_dev;
1316 const union ib_gid *gid = req->has_gid ? &req->local_gid : NULL;
1317 int err;
1318
1319 err = cma_save_ip_info(listen_addr, src_addr, ib_event,
1320 req->service_id);
1321 if (err)
1322 return ERR_PTR(err);
1323
1324 net_dev = ib_get_net_dev_by_params(req->device, req->port, req->pkey,
1325 gid, listen_addr);
1326 if (!net_dev)
1327 return ERR_PTR(-ENODEV);
1328
1329 if (!validate_net_dev(net_dev, listen_addr, src_addr)) {
1330 dev_put(net_dev);
1331 return ERR_PTR(-EHOSTUNREACH);
1332 }
1333
1334 return net_dev;
1335 }
1336
1337 static enum rdma_port_space rdma_ps_from_service_id(__be64 service_id)
1338 {
1339 return (be64_to_cpu(service_id) >> 16) & 0xffff;
1340 }
1341
1342 static bool cma_match_private_data(struct rdma_id_private *id_priv,
1343 const struct cma_hdr *hdr)
1344 {
1345 struct sockaddr *addr = cma_src_addr(id_priv);
1346 __be32 ip4_addr;
1347 struct in6_addr ip6_addr;
1348
1349 if (cma_any_addr(addr) && !id_priv->afonly)
1350 return true;
1351
1352 switch (addr->sa_family) {
1353 case AF_INET:
1354 ip4_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
1355 if (cma_get_ip_ver(hdr) != 4)
1356 return false;
1357 if (!cma_any_addr(addr) &&
1358 hdr->dst_addr.ip4.addr != ip4_addr)
1359 return false;
1360 break;
1361 case AF_INET6:
1362 ip6_addr = ((struct sockaddr_in6 *)addr)->sin6_addr;
1363 if (cma_get_ip_ver(hdr) != 6)
1364 return false;
1365 if (!cma_any_addr(addr) &&
1366 memcmp(&hdr->dst_addr.ip6, &ip6_addr, sizeof(ip6_addr)))
1367 return false;
1368 break;
1369 case AF_IB:
1370 return true;
1371 default:
1372 return false;
1373 }
1374
1375 return true;
1376 }
1377
1378 static bool cma_protocol_roce_dev_port(struct ib_device *device, int port_num)
1379 {
1380 enum rdma_link_layer ll = rdma_port_get_link_layer(device, port_num);
1381 enum rdma_transport_type transport =
1382 rdma_node_get_transport(device->node_type);
1383
1384 return ll == IB_LINK_LAYER_ETHERNET && transport == RDMA_TRANSPORT_IB;
1385 }
1386
1387 static bool cma_protocol_roce(const struct rdma_cm_id *id)
1388 {
1389 struct ib_device *device = id->device;
1390 const int port_num = id->port_num ?: rdma_start_port(device);
1391
1392 return cma_protocol_roce_dev_port(device, port_num);
1393 }
1394
1395 static bool cma_match_net_dev(const struct rdma_cm_id *id,
1396 const struct net_device *net_dev,
1397 u8 port_num)
1398 {
1399 const struct rdma_addr *addr = &id->route.addr;
1400
1401 if (!net_dev)
1402 /* This request is an AF_IB request or a RoCE request */
1403 return (!id->port_num || id->port_num == port_num) &&
1404 (addr->src_addr.ss_family == AF_IB ||
1405 cma_protocol_roce_dev_port(id->device, port_num));
1406
1407 return !addr->dev_addr.bound_dev_if ||
1408 (net_eq(dev_net(net_dev), addr->dev_addr.net) &&
1409 addr->dev_addr.bound_dev_if == net_dev->ifindex);
1410 }
1411
1412 static struct rdma_id_private *cma_find_listener(
1413 const struct rdma_bind_list *bind_list,
1414 const struct ib_cm_id *cm_id,
1415 const struct ib_cm_event *ib_event,
1416 const struct cma_req_info *req,
1417 const struct net_device *net_dev)
1418 {
1419 struct rdma_id_private *id_priv, *id_priv_dev;
1420
1421 if (!bind_list)
1422 return ERR_PTR(-EINVAL);
1423
1424 hlist_for_each_entry(id_priv, &bind_list->owners, node) {
1425 if (cma_match_private_data(id_priv, ib_event->private_data)) {
1426 if (id_priv->id.device == cm_id->device &&
1427 cma_match_net_dev(&id_priv->id, net_dev, req->port))
1428 return id_priv;
1429 list_for_each_entry(id_priv_dev,
1430 &id_priv->listen_list,
1431 listen_list) {
1432 if (id_priv_dev->id.device == cm_id->device &&
1433 cma_match_net_dev(&id_priv_dev->id, net_dev, req->port))
1434 return id_priv_dev;
1435 }
1436 }
1437 }
1438
1439 return ERR_PTR(-EINVAL);
1440 }
1441
1442 static struct rdma_id_private *cma_id_from_event(struct ib_cm_id *cm_id,
1443 struct ib_cm_event *ib_event,
1444 struct net_device **net_dev)
1445 {
1446 struct cma_req_info req;
1447 struct rdma_bind_list *bind_list;
1448 struct rdma_id_private *id_priv;
1449 int err;
1450
1451 err = cma_save_req_info(ib_event, &req);
1452 if (err)
1453 return ERR_PTR(err);
1454
1455 *net_dev = cma_get_net_dev(ib_event, &req);
1456 if (IS_ERR(*net_dev)) {
1457 if (PTR_ERR(*net_dev) == -EAFNOSUPPORT) {
1458 /* Assuming the protocol is AF_IB */
1459 *net_dev = NULL;
1460 } else if (cma_protocol_roce_dev_port(req.device, req.port)) {
1461 /* TODO find the net dev matching the request parameters
1462 * through the RoCE GID table */
1463 *net_dev = NULL;
1464 } else {
1465 return ERR_CAST(*net_dev);
1466 }
1467 }
1468
1469 bind_list = cma_ps_find(*net_dev ? dev_net(*net_dev) : &init_net,
1470 rdma_ps_from_service_id(req.service_id),
1471 cma_port_from_service_id(req.service_id));
1472 id_priv = cma_find_listener(bind_list, cm_id, ib_event, &req, *net_dev);
1473 if (IS_ERR(id_priv) && *net_dev) {
1474 dev_put(*net_dev);
1475 *net_dev = NULL;
1476 }
1477
1478 return id_priv;
1479 }
1480
1481 static inline int cma_user_data_offset(struct rdma_id_private *id_priv)
1482 {
1483 return cma_family(id_priv) == AF_IB ? 0 : sizeof(struct cma_hdr);
1484 }
1485
1486 static void cma_cancel_route(struct rdma_id_private *id_priv)
1487 {
1488 if (rdma_cap_ib_sa(id_priv->id.device, id_priv->id.port_num)) {
1489 if (id_priv->query)
1490 ib_sa_cancel_query(id_priv->query_id, id_priv->query);
1491 }
1492 }
1493
1494 static void cma_cancel_listens(struct rdma_id_private *id_priv)
1495 {
1496 struct rdma_id_private *dev_id_priv;
1497
1498 /*
1499 * Remove from listen_any_list to prevent added devices from spawning
1500 * additional listen requests.
1501 */
1502 mutex_lock(&lock);
1503 list_del(&id_priv->list);
1504
1505 while (!list_empty(&id_priv->listen_list)) {
1506 dev_id_priv = list_entry(id_priv->listen_list.next,
1507 struct rdma_id_private, listen_list);
1508 /* sync with device removal to avoid duplicate destruction */
1509 list_del_init(&dev_id_priv->list);
1510 list_del(&dev_id_priv->listen_list);
1511 mutex_unlock(&lock);
1512
1513 rdma_destroy_id(&dev_id_priv->id);
1514 mutex_lock(&lock);
1515 }
1516 mutex_unlock(&lock);
1517 }
1518
1519 static void cma_cancel_operation(struct rdma_id_private *id_priv,
1520 enum rdma_cm_state state)
1521 {
1522 switch (state) {
1523 case RDMA_CM_ADDR_QUERY:
1524 rdma_addr_cancel(&id_priv->id.route.addr.dev_addr);
1525 break;
1526 case RDMA_CM_ROUTE_QUERY:
1527 cma_cancel_route(id_priv);
1528 break;
1529 case RDMA_CM_LISTEN:
1530 if (cma_any_addr(cma_src_addr(id_priv)) && !id_priv->cma_dev)
1531 cma_cancel_listens(id_priv);
1532 break;
1533 default:
1534 break;
1535 }
1536 }
1537
1538 static void cma_release_port(struct rdma_id_private *id_priv)
1539 {
1540 struct rdma_bind_list *bind_list = id_priv->bind_list;
1541 struct net *net = id_priv->id.route.addr.dev_addr.net;
1542
1543 if (!bind_list)
1544 return;
1545
1546 mutex_lock(&lock);
1547 hlist_del(&id_priv->node);
1548 if (hlist_empty(&bind_list->owners)) {
1549 cma_ps_remove(net, bind_list->ps, bind_list->port);
1550 kfree(bind_list);
1551 }
1552 mutex_unlock(&lock);
1553 }
1554
1555 static void cma_leave_mc_groups(struct rdma_id_private *id_priv)
1556 {
1557 struct cma_multicast *mc;
1558
1559 while (!list_empty(&id_priv->mc_list)) {
1560 mc = container_of(id_priv->mc_list.next,
1561 struct cma_multicast, list);
1562 list_del(&mc->list);
1563 if (rdma_cap_ib_mcast(id_priv->cma_dev->device,
1564 id_priv->id.port_num)) {
1565 ib_sa_free_multicast(mc->multicast.ib);
1566 kfree(mc);
1567 } else {
1568 if (mc->igmp_joined) {
1569 struct rdma_dev_addr *dev_addr =
1570 &id_priv->id.route.addr.dev_addr;
1571 struct net_device *ndev = NULL;
1572
1573 if (dev_addr->bound_dev_if)
1574 ndev = dev_get_by_index(&init_net,
1575 dev_addr->bound_dev_if);
1576 if (ndev) {
1577 cma_igmp_send(ndev,
1578 &mc->multicast.ib->rec.mgid,
1579 false);
1580 dev_put(ndev);
1581 }
1582 }
1583 kref_put(&mc->mcref, release_mc);
1584 }
1585 }
1586 }
1587
1588 void rdma_destroy_id(struct rdma_cm_id *id)
1589 {
1590 struct rdma_id_private *id_priv;
1591 enum rdma_cm_state state;
1592
1593 id_priv = container_of(id, struct rdma_id_private, id);
1594 state = cma_exch(id_priv, RDMA_CM_DESTROYING);
1595 cma_cancel_operation(id_priv, state);
1596
1597 /*
1598 * Wait for any active callback to finish. New callbacks will find
1599 * the id_priv state set to destroying and abort.
1600 */
1601 mutex_lock(&id_priv->handler_mutex);
1602 mutex_unlock(&id_priv->handler_mutex);
1603
1604 if (id_priv->cma_dev) {
1605 if (rdma_cap_ib_cm(id_priv->id.device, 1)) {
1606 if (id_priv->cm_id.ib)
1607 ib_destroy_cm_id(id_priv->cm_id.ib);
1608 } else if (rdma_cap_iw_cm(id_priv->id.device, 1)) {
1609 if (id_priv->cm_id.iw)
1610 iw_destroy_cm_id(id_priv->cm_id.iw);
1611 }
1612 cma_leave_mc_groups(id_priv);
1613 cma_release_dev(id_priv);
1614 }
1615
1616 cma_release_port(id_priv);
1617 cma_deref_id(id_priv);
1618 wait_for_completion(&id_priv->comp);
1619
1620 if (id_priv->internal_id)
1621 cma_deref_id(id_priv->id.context);
1622
1623 kfree(id_priv->id.route.path_rec);
1624 put_net(id_priv->id.route.addr.dev_addr.net);
1625 kfree(id_priv);
1626 }
1627 EXPORT_SYMBOL(rdma_destroy_id);
1628
1629 static int cma_rep_recv(struct rdma_id_private *id_priv)
1630 {
1631 int ret;
1632
1633 ret = cma_modify_qp_rtr(id_priv, NULL);
1634 if (ret)
1635 goto reject;
1636
1637 ret = cma_modify_qp_rts(id_priv, NULL);
1638 if (ret)
1639 goto reject;
1640
1641 ret = ib_send_cm_rtu(id_priv->cm_id.ib, NULL, 0);
1642 if (ret)
1643 goto reject;
1644
1645 return 0;
1646 reject:
1647 cma_modify_qp_err(id_priv);
1648 ib_send_cm_rej(id_priv->cm_id.ib, IB_CM_REJ_CONSUMER_DEFINED,
1649 NULL, 0, NULL, 0);
1650 return ret;
1651 }
1652
1653 static void cma_set_rep_event_data(struct rdma_cm_event *event,
1654 struct ib_cm_rep_event_param *rep_data,
1655 void *private_data)
1656 {
1657 event->param.conn.private_data = private_data;
1658 event->param.conn.private_data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
1659 event->param.conn.responder_resources = rep_data->responder_resources;
1660 event->param.conn.initiator_depth = rep_data->initiator_depth;
1661 event->param.conn.flow_control = rep_data->flow_control;
1662 event->param.conn.rnr_retry_count = rep_data->rnr_retry_count;
1663 event->param.conn.srq = rep_data->srq;
1664 event->param.conn.qp_num = rep_data->remote_qpn;
1665 }
1666
1667 static int cma_ib_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
1668 {
1669 struct rdma_id_private *id_priv = cm_id->context;
1670 struct rdma_cm_event event;
1671 int ret = 0;
1672
1673 mutex_lock(&id_priv->handler_mutex);
1674 if ((ib_event->event != IB_CM_TIMEWAIT_EXIT &&
1675 id_priv->state != RDMA_CM_CONNECT) ||
1676 (ib_event->event == IB_CM_TIMEWAIT_EXIT &&
1677 id_priv->state != RDMA_CM_DISCONNECT))
1678 goto out;
1679
1680 memset(&event, 0, sizeof event);
1681 switch (ib_event->event) {
1682 case IB_CM_REQ_ERROR:
1683 case IB_CM_REP_ERROR:
1684 event.event = RDMA_CM_EVENT_UNREACHABLE;
1685 event.status = -ETIMEDOUT;
1686 break;
1687 case IB_CM_REP_RECEIVED:
1688 if (id_priv->id.qp) {
1689 event.status = cma_rep_recv(id_priv);
1690 event.event = event.status ? RDMA_CM_EVENT_CONNECT_ERROR :
1691 RDMA_CM_EVENT_ESTABLISHED;
1692 } else {
1693 event.event = RDMA_CM_EVENT_CONNECT_RESPONSE;
1694 }
1695 cma_set_rep_event_data(&event, &ib_event->param.rep_rcvd,
1696 ib_event->private_data);
1697 break;
1698 case IB_CM_RTU_RECEIVED:
1699 case IB_CM_USER_ESTABLISHED:
1700 event.event = RDMA_CM_EVENT_ESTABLISHED;
1701 break;
1702 case IB_CM_DREQ_ERROR:
1703 event.status = -ETIMEDOUT; /* fall through */
1704 case IB_CM_DREQ_RECEIVED:
1705 case IB_CM_DREP_RECEIVED:
1706 if (!cma_comp_exch(id_priv, RDMA_CM_CONNECT,
1707 RDMA_CM_DISCONNECT))
1708 goto out;
1709 event.event = RDMA_CM_EVENT_DISCONNECTED;
1710 break;
1711 case IB_CM_TIMEWAIT_EXIT:
1712 event.event = RDMA_CM_EVENT_TIMEWAIT_EXIT;
1713 break;
1714 case IB_CM_MRA_RECEIVED:
1715 /* ignore event */
1716 goto out;
1717 case IB_CM_REJ_RECEIVED:
1718 cma_modify_qp_err(id_priv);
1719 event.status = ib_event->param.rej_rcvd.reason;
1720 event.event = RDMA_CM_EVENT_REJECTED;
1721 event.param.conn.private_data = ib_event->private_data;
1722 event.param.conn.private_data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
1723 break;
1724 default:
1725 pr_err("RDMA CMA: unexpected IB CM event: %d\n",
1726 ib_event->event);
1727 goto out;
1728 }
1729
1730 ret = id_priv->id.event_handler(&id_priv->id, &event);
1731 if (ret) {
1732 /* Destroy the CM ID by returning a non-zero value. */
1733 id_priv->cm_id.ib = NULL;
1734 cma_exch(id_priv, RDMA_CM_DESTROYING);
1735 mutex_unlock(&id_priv->handler_mutex);
1736 rdma_destroy_id(&id_priv->id);
1737 return ret;
1738 }
1739 out:
1740 mutex_unlock(&id_priv->handler_mutex);
1741 return ret;
1742 }
1743
1744 static struct rdma_id_private *cma_new_conn_id(struct rdma_cm_id *listen_id,
1745 struct ib_cm_event *ib_event,
1746 struct net_device *net_dev)
1747 {
1748 struct rdma_id_private *id_priv;
1749 struct rdma_cm_id *id;
1750 struct rdma_route *rt;
1751 const sa_family_t ss_family = listen_id->route.addr.src_addr.ss_family;
1752 const __be64 service_id =
1753 ib_event->param.req_rcvd.primary_path->service_id;
1754 int ret;
1755
1756 id = rdma_create_id(listen_id->route.addr.dev_addr.net,
1757 listen_id->event_handler, listen_id->context,
1758 listen_id->ps, ib_event->param.req_rcvd.qp_type);
1759 if (IS_ERR(id))
1760 return NULL;
1761
1762 id_priv = container_of(id, struct rdma_id_private, id);
1763 if (cma_save_net_info((struct sockaddr *)&id->route.addr.src_addr,
1764 (struct sockaddr *)&id->route.addr.dst_addr,
1765 listen_id, ib_event, ss_family, service_id))
1766 goto err;
1767
1768 rt = &id->route;
1769 rt->num_paths = ib_event->param.req_rcvd.alternate_path ? 2 : 1;
1770 rt->path_rec = kmalloc(sizeof *rt->path_rec * rt->num_paths,
1771 GFP_KERNEL);
1772 if (!rt->path_rec)
1773 goto err;
1774
1775 rt->path_rec[0] = *ib_event->param.req_rcvd.primary_path;
1776 if (rt->num_paths == 2)
1777 rt->path_rec[1] = *ib_event->param.req_rcvd.alternate_path;
1778
1779 if (net_dev) {
1780 ret = rdma_copy_addr(&rt->addr.dev_addr, net_dev, NULL);
1781 if (ret)
1782 goto err;
1783 } else {
1784 if (!cma_protocol_roce(listen_id) &&
1785 cma_any_addr(cma_src_addr(id_priv))) {
1786 rt->addr.dev_addr.dev_type = ARPHRD_INFINIBAND;
1787 rdma_addr_set_sgid(&rt->addr.dev_addr, &rt->path_rec[0].sgid);
1788 ib_addr_set_pkey(&rt->addr.dev_addr, be16_to_cpu(rt->path_rec[0].pkey));
1789 } else if (!cma_any_addr(cma_src_addr(id_priv))) {
1790 ret = cma_translate_addr(cma_src_addr(id_priv), &rt->addr.dev_addr);
1791 if (ret)
1792 goto err;
1793 }
1794 }
1795 rdma_addr_set_dgid(&rt->addr.dev_addr, &rt->path_rec[0].dgid);
1796
1797 id_priv->state = RDMA_CM_CONNECT;
1798 return id_priv;
1799
1800 err:
1801 rdma_destroy_id(id);
1802 return NULL;
1803 }
1804
1805 static struct rdma_id_private *cma_new_udp_id(struct rdma_cm_id *listen_id,
1806 struct ib_cm_event *ib_event,
1807 struct net_device *net_dev)
1808 {
1809 struct rdma_id_private *id_priv;
1810 struct rdma_cm_id *id;
1811 const sa_family_t ss_family = listen_id->route.addr.src_addr.ss_family;
1812 struct net *net = listen_id->route.addr.dev_addr.net;
1813 int ret;
1814
1815 id = rdma_create_id(net, listen_id->event_handler, listen_id->context,
1816 listen_id->ps, IB_QPT_UD);
1817 if (IS_ERR(id))
1818 return NULL;
1819
1820 id_priv = container_of(id, struct rdma_id_private, id);
1821 if (cma_save_net_info((struct sockaddr *)&id->route.addr.src_addr,
1822 (struct sockaddr *)&id->route.addr.dst_addr,
1823 listen_id, ib_event, ss_family,
1824 ib_event->param.sidr_req_rcvd.service_id))
1825 goto err;
1826
1827 if (net_dev) {
1828 ret = rdma_copy_addr(&id->route.addr.dev_addr, net_dev, NULL);
1829 if (ret)
1830 goto err;
1831 } else {
1832 if (!cma_any_addr(cma_src_addr(id_priv))) {
1833 ret = cma_translate_addr(cma_src_addr(id_priv),
1834 &id->route.addr.dev_addr);
1835 if (ret)
1836 goto err;
1837 }
1838 }
1839
1840 id_priv->state = RDMA_CM_CONNECT;
1841 return id_priv;
1842 err:
1843 rdma_destroy_id(id);
1844 return NULL;
1845 }
1846
1847 static void cma_set_req_event_data(struct rdma_cm_event *event,
1848 struct ib_cm_req_event_param *req_data,
1849 void *private_data, int offset)
1850 {
1851 event->param.conn.private_data = private_data + offset;
1852 event->param.conn.private_data_len = IB_CM_REQ_PRIVATE_DATA_SIZE - offset;
1853 event->param.conn.responder_resources = req_data->responder_resources;
1854 event->param.conn.initiator_depth = req_data->initiator_depth;
1855 event->param.conn.flow_control = req_data->flow_control;
1856 event->param.conn.retry_count = req_data->retry_count;
1857 event->param.conn.rnr_retry_count = req_data->rnr_retry_count;
1858 event->param.conn.srq = req_data->srq;
1859 event->param.conn.qp_num = req_data->remote_qpn;
1860 }
1861
1862 static int cma_check_req_qp_type(struct rdma_cm_id *id, struct ib_cm_event *ib_event)
1863 {
1864 return (((ib_event->event == IB_CM_REQ_RECEIVED) &&
1865 (ib_event->param.req_rcvd.qp_type == id->qp_type)) ||
1866 ((ib_event->event == IB_CM_SIDR_REQ_RECEIVED) &&
1867 (id->qp_type == IB_QPT_UD)) ||
1868 (!id->qp_type));
1869 }
1870
1871 static int cma_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
1872 {
1873 struct rdma_id_private *listen_id, *conn_id = NULL;
1874 struct rdma_cm_event event;
1875 struct net_device *net_dev;
1876 int offset, ret;
1877
1878 listen_id = cma_id_from_event(cm_id, ib_event, &net_dev);
1879 if (IS_ERR(listen_id))
1880 return PTR_ERR(listen_id);
1881
1882 if (!cma_check_req_qp_type(&listen_id->id, ib_event)) {
1883 ret = -EINVAL;
1884 goto net_dev_put;
1885 }
1886
1887 mutex_lock(&listen_id->handler_mutex);
1888 if (listen_id->state != RDMA_CM_LISTEN) {
1889 ret = -ECONNABORTED;
1890 goto err1;
1891 }
1892
1893 memset(&event, 0, sizeof event);
1894 offset = cma_user_data_offset(listen_id);
1895 event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
1896 if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED) {
1897 conn_id = cma_new_udp_id(&listen_id->id, ib_event, net_dev);
1898 event.param.ud.private_data = ib_event->private_data + offset;
1899 event.param.ud.private_data_len =
1900 IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE - offset;
1901 } else {
1902 conn_id = cma_new_conn_id(&listen_id->id, ib_event, net_dev);
1903 cma_set_req_event_data(&event, &ib_event->param.req_rcvd,
1904 ib_event->private_data, offset);
1905 }
1906 if (!conn_id) {
1907 ret = -ENOMEM;
1908 goto err1;
1909 }
1910
1911 mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
1912 ret = cma_acquire_dev(conn_id, listen_id);
1913 if (ret)
1914 goto err2;
1915
1916 conn_id->cm_id.ib = cm_id;
1917 cm_id->context = conn_id;
1918 cm_id->cm_handler = cma_ib_handler;
1919
1920 /*
1921 * Protect against the user destroying conn_id from another thread
1922 * until we're done accessing it.
1923 */
1924 atomic_inc(&conn_id->refcount);
1925 ret = conn_id->id.event_handler(&conn_id->id, &event);
1926 if (ret)
1927 goto err3;
1928 /*
1929 * Acquire mutex to prevent user executing rdma_destroy_id()
1930 * while we're accessing the cm_id.
1931 */
1932 mutex_lock(&lock);
1933 if (cma_comp(conn_id, RDMA_CM_CONNECT) &&
1934 (conn_id->id.qp_type != IB_QPT_UD))
1935 ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0);
1936 mutex_unlock(&lock);
1937 mutex_unlock(&conn_id->handler_mutex);
1938 mutex_unlock(&listen_id->handler_mutex);
1939 cma_deref_id(conn_id);
1940 if (net_dev)
1941 dev_put(net_dev);
1942 return 0;
1943
1944 err3:
1945 cma_deref_id(conn_id);
1946 /* Destroy the CM ID by returning a non-zero value. */
1947 conn_id->cm_id.ib = NULL;
1948 err2:
1949 cma_exch(conn_id, RDMA_CM_DESTROYING);
1950 mutex_unlock(&conn_id->handler_mutex);
1951 err1:
1952 mutex_unlock(&listen_id->handler_mutex);
1953 if (conn_id)
1954 rdma_destroy_id(&conn_id->id);
1955
1956 net_dev_put:
1957 if (net_dev)
1958 dev_put(net_dev);
1959
1960 return ret;
1961 }
1962
1963 __be64 rdma_get_service_id(struct rdma_cm_id *id, struct sockaddr *addr)
1964 {
1965 if (addr->sa_family == AF_IB)
1966 return ((struct sockaddr_ib *) addr)->sib_sid;
1967
1968 return cpu_to_be64(((u64)id->ps << 16) + be16_to_cpu(cma_port(addr)));
1969 }
1970 EXPORT_SYMBOL(rdma_get_service_id);
1971
1972 static int cma_iw_handler(struct iw_cm_id *iw_id, struct iw_cm_event *iw_event)
1973 {
1974 struct rdma_id_private *id_priv = iw_id->context;
1975 struct rdma_cm_event event;
1976 int ret = 0;
1977 struct sockaddr *laddr = (struct sockaddr *)&iw_event->local_addr;
1978 struct sockaddr *raddr = (struct sockaddr *)&iw_event->remote_addr;
1979
1980 mutex_lock(&id_priv->handler_mutex);
1981 if (id_priv->state != RDMA_CM_CONNECT)
1982 goto out;
1983
1984 memset(&event, 0, sizeof event);
1985 switch (iw_event->event) {
1986 case IW_CM_EVENT_CLOSE:
1987 event.event = RDMA_CM_EVENT_DISCONNECTED;
1988 break;
1989 case IW_CM_EVENT_CONNECT_REPLY:
1990 memcpy(cma_src_addr(id_priv), laddr,
1991 rdma_addr_size(laddr));
1992 memcpy(cma_dst_addr(id_priv), raddr,
1993 rdma_addr_size(raddr));
1994 switch (iw_event->status) {
1995 case 0:
1996 event.event = RDMA_CM_EVENT_ESTABLISHED;
1997 event.param.conn.initiator_depth = iw_event->ird;
1998 event.param.conn.responder_resources = iw_event->ord;
1999 break;
2000 case -ECONNRESET:
2001 case -ECONNREFUSED:
2002 event.event = RDMA_CM_EVENT_REJECTED;
2003 break;
2004 case -ETIMEDOUT:
2005 event.event = RDMA_CM_EVENT_UNREACHABLE;
2006 break;
2007 default:
2008 event.event = RDMA_CM_EVENT_CONNECT_ERROR;
2009 break;
2010 }
2011 break;
2012 case IW_CM_EVENT_ESTABLISHED:
2013 event.event = RDMA_CM_EVENT_ESTABLISHED;
2014 event.param.conn.initiator_depth = iw_event->ird;
2015 event.param.conn.responder_resources = iw_event->ord;
2016 break;
2017 default:
2018 BUG_ON(1);
2019 }
2020
2021 event.status = iw_event->status;
2022 event.param.conn.private_data = iw_event->private_data;
2023 event.param.conn.private_data_len = iw_event->private_data_len;
2024 ret = id_priv->id.event_handler(&id_priv->id, &event);
2025 if (ret) {
2026 /* Destroy the CM ID by returning a non-zero value. */
2027 id_priv->cm_id.iw = NULL;
2028 cma_exch(id_priv, RDMA_CM_DESTROYING);
2029 mutex_unlock(&id_priv->handler_mutex);
2030 rdma_destroy_id(&id_priv->id);
2031 return ret;
2032 }
2033
2034 out:
2035 mutex_unlock(&id_priv->handler_mutex);
2036 return ret;
2037 }
2038
2039 static int iw_conn_req_handler(struct iw_cm_id *cm_id,
2040 struct iw_cm_event *iw_event)
2041 {
2042 struct rdma_cm_id *new_cm_id;
2043 struct rdma_id_private *listen_id, *conn_id;
2044 struct rdma_cm_event event;
2045 int ret = -ECONNABORTED;
2046 struct sockaddr *laddr = (struct sockaddr *)&iw_event->local_addr;
2047 struct sockaddr *raddr = (struct sockaddr *)&iw_event->remote_addr;
2048
2049 listen_id = cm_id->context;
2050
2051 mutex_lock(&listen_id->handler_mutex);
2052 if (listen_id->state != RDMA_CM_LISTEN)
2053 goto out;
2054
2055 /* Create a new RDMA id for the new IW CM ID */
2056 new_cm_id = rdma_create_id(listen_id->id.route.addr.dev_addr.net,
2057 listen_id->id.event_handler,
2058 listen_id->id.context,
2059 RDMA_PS_TCP, IB_QPT_RC);
2060 if (IS_ERR(new_cm_id)) {
2061 ret = -ENOMEM;
2062 goto out;
2063 }
2064 conn_id = container_of(new_cm_id, struct rdma_id_private, id);
2065 mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
2066 conn_id->state = RDMA_CM_CONNECT;
2067
2068 ret = rdma_translate_ip(laddr, &conn_id->id.route.addr.dev_addr, NULL);
2069 if (ret) {
2070 mutex_unlock(&conn_id->handler_mutex);
2071 rdma_destroy_id(new_cm_id);
2072 goto out;
2073 }
2074
2075 ret = cma_acquire_dev(conn_id, listen_id);
2076 if (ret) {
2077 mutex_unlock(&conn_id->handler_mutex);
2078 rdma_destroy_id(new_cm_id);
2079 goto out;
2080 }
2081
2082 conn_id->cm_id.iw = cm_id;
2083 cm_id->context = conn_id;
2084 cm_id->cm_handler = cma_iw_handler;
2085
2086 memcpy(cma_src_addr(conn_id), laddr, rdma_addr_size(laddr));
2087 memcpy(cma_dst_addr(conn_id), raddr, rdma_addr_size(raddr));
2088
2089 memset(&event, 0, sizeof event);
2090 event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
2091 event.param.conn.private_data = iw_event->private_data;
2092 event.param.conn.private_data_len = iw_event->private_data_len;
2093 event.param.conn.initiator_depth = iw_event->ird;
2094 event.param.conn.responder_resources = iw_event->ord;
2095
2096 /*
2097 * Protect against the user destroying conn_id from another thread
2098 * until we're done accessing it.
2099 */
2100 atomic_inc(&conn_id->refcount);
2101 ret = conn_id->id.event_handler(&conn_id->id, &event);
2102 if (ret) {
2103 /* User wants to destroy the CM ID */
2104 conn_id->cm_id.iw = NULL;
2105 cma_exch(conn_id, RDMA_CM_DESTROYING);
2106 mutex_unlock(&conn_id->handler_mutex);
2107 cma_deref_id(conn_id);
2108 rdma_destroy_id(&conn_id->id);
2109 goto out;
2110 }
2111
2112 mutex_unlock(&conn_id->handler_mutex);
2113 cma_deref_id(conn_id);
2114
2115 out:
2116 mutex_unlock(&listen_id->handler_mutex);
2117 return ret;
2118 }
2119
2120 static int cma_ib_listen(struct rdma_id_private *id_priv)
2121 {
2122 struct sockaddr *addr;
2123 struct ib_cm_id *id;
2124 __be64 svc_id;
2125
2126 addr = cma_src_addr(id_priv);
2127 svc_id = rdma_get_service_id(&id_priv->id, addr);
2128 id = ib_cm_insert_listen(id_priv->id.device, cma_req_handler, svc_id);
2129 if (IS_ERR(id))
2130 return PTR_ERR(id);
2131 id_priv->cm_id.ib = id;
2132
2133 return 0;
2134 }
2135
2136 static int cma_iw_listen(struct rdma_id_private *id_priv, int backlog)
2137 {
2138 int ret;
2139 struct iw_cm_id *id;
2140
2141 id = iw_create_cm_id(id_priv->id.device,
2142 iw_conn_req_handler,
2143 id_priv);
2144 if (IS_ERR(id))
2145 return PTR_ERR(id);
2146
2147 id->tos = id_priv->tos;
2148 id_priv->cm_id.iw = id;
2149
2150 memcpy(&id_priv->cm_id.iw->local_addr, cma_src_addr(id_priv),
2151 rdma_addr_size(cma_src_addr(id_priv)));
2152
2153 ret = iw_cm_listen(id_priv->cm_id.iw, backlog);
2154
2155 if (ret) {
2156 iw_destroy_cm_id(id_priv->cm_id.iw);
2157 id_priv->cm_id.iw = NULL;
2158 }
2159
2160 return ret;
2161 }
2162
2163 static int cma_listen_handler(struct rdma_cm_id *id,
2164 struct rdma_cm_event *event)
2165 {
2166 struct rdma_id_private *id_priv = id->context;
2167
2168 id->context = id_priv->id.context;
2169 id->event_handler = id_priv->id.event_handler;
2170 return id_priv->id.event_handler(id, event);
2171 }
2172
2173 static void cma_listen_on_dev(struct rdma_id_private *id_priv,
2174 struct cma_device *cma_dev)
2175 {
2176 struct rdma_id_private *dev_id_priv;
2177 struct rdma_cm_id *id;
2178 struct net *net = id_priv->id.route.addr.dev_addr.net;
2179 int ret;
2180
2181 if (cma_family(id_priv) == AF_IB && !rdma_cap_ib_cm(cma_dev->device, 1))
2182 return;
2183
2184 id = rdma_create_id(net, cma_listen_handler, id_priv, id_priv->id.ps,
2185 id_priv->id.qp_type);
2186 if (IS_ERR(id))
2187 return;
2188
2189 dev_id_priv = container_of(id, struct rdma_id_private, id);
2190
2191 dev_id_priv->state = RDMA_CM_ADDR_BOUND;
2192 memcpy(cma_src_addr(dev_id_priv), cma_src_addr(id_priv),
2193 rdma_addr_size(cma_src_addr(id_priv)));
2194
2195 _cma_attach_to_dev(dev_id_priv, cma_dev);
2196 list_add_tail(&dev_id_priv->listen_list, &id_priv->listen_list);
2197 atomic_inc(&id_priv->refcount);
2198 dev_id_priv->internal_id = 1;
2199 dev_id_priv->afonly = id_priv->afonly;
2200
2201 ret = rdma_listen(id, id_priv->backlog);
2202 if (ret)
2203 pr_warn("RDMA CMA: cma_listen_on_dev, error %d, listening on device %s\n",
2204 ret, cma_dev->device->name);
2205 }
2206
2207 static void cma_listen_on_all(struct rdma_id_private *id_priv)
2208 {
2209 struct cma_device *cma_dev;
2210
2211 mutex_lock(&lock);
2212 list_add_tail(&id_priv->list, &listen_any_list);
2213 list_for_each_entry(cma_dev, &dev_list, list)
2214 cma_listen_on_dev(id_priv, cma_dev);
2215 mutex_unlock(&lock);
2216 }
2217
2218 void rdma_set_service_type(struct rdma_cm_id *id, int tos)
2219 {
2220 struct rdma_id_private *id_priv;
2221
2222 id_priv = container_of(id, struct rdma_id_private, id);
2223 id_priv->tos = (u8) tos;
2224 }
2225 EXPORT_SYMBOL(rdma_set_service_type);
2226
2227 static void cma_query_handler(int status, struct ib_sa_path_rec *path_rec,
2228 void *context)
2229 {
2230 struct cma_work *work = context;
2231 struct rdma_route *route;
2232
2233 route = &work->id->id.route;
2234
2235 if (!status) {
2236 route->num_paths = 1;
2237 *route->path_rec = *path_rec;
2238 } else {
2239 work->old_state = RDMA_CM_ROUTE_QUERY;
2240 work->new_state = RDMA_CM_ADDR_RESOLVED;
2241 work->event.event = RDMA_CM_EVENT_ROUTE_ERROR;
2242 work->event.status = status;
2243 }
2244
2245 queue_work(cma_wq, &work->work);
2246 }
2247
2248 static int cma_query_ib_route(struct rdma_id_private *id_priv, int timeout_ms,
2249 struct cma_work *work)
2250 {
2251 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
2252 struct ib_sa_path_rec path_rec;
2253 ib_sa_comp_mask comp_mask;
2254 struct sockaddr_in6 *sin6;
2255 struct sockaddr_ib *sib;
2256
2257 memset(&path_rec, 0, sizeof path_rec);
2258 rdma_addr_get_sgid(dev_addr, &path_rec.sgid);
2259 rdma_addr_get_dgid(dev_addr, &path_rec.dgid);
2260 path_rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
2261 path_rec.numb_path = 1;
2262 path_rec.reversible = 1;
2263 path_rec.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
2264
2265 comp_mask = IB_SA_PATH_REC_DGID | IB_SA_PATH_REC_SGID |
2266 IB_SA_PATH_REC_PKEY | IB_SA_PATH_REC_NUMB_PATH |
2267 IB_SA_PATH_REC_REVERSIBLE | IB_SA_PATH_REC_SERVICE_ID;
2268
2269 switch (cma_family(id_priv)) {
2270 case AF_INET:
2271 path_rec.qos_class = cpu_to_be16((u16) id_priv->tos);
2272 comp_mask |= IB_SA_PATH_REC_QOS_CLASS;
2273 break;
2274 case AF_INET6:
2275 sin6 = (struct sockaddr_in6 *) cma_src_addr(id_priv);
2276 path_rec.traffic_class = (u8) (be32_to_cpu(sin6->sin6_flowinfo) >> 20);
2277 comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
2278 break;
2279 case AF_IB:
2280 sib = (struct sockaddr_ib *) cma_src_addr(id_priv);
2281 path_rec.traffic_class = (u8) (be32_to_cpu(sib->sib_flowinfo) >> 20);
2282 comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
2283 break;
2284 }
2285
2286 id_priv->query_id = ib_sa_path_rec_get(&sa_client, id_priv->id.device,
2287 id_priv->id.port_num, &path_rec,
2288 comp_mask, timeout_ms,
2289 GFP_KERNEL, cma_query_handler,
2290 work, &id_priv->query);
2291
2292 return (id_priv->query_id < 0) ? id_priv->query_id : 0;
2293 }
2294
2295 static void cma_work_handler(struct work_struct *_work)
2296 {
2297 struct cma_work *work = container_of(_work, struct cma_work, work);
2298 struct rdma_id_private *id_priv = work->id;
2299 int destroy = 0;
2300
2301 mutex_lock(&id_priv->handler_mutex);
2302 if (!cma_comp_exch(id_priv, work->old_state, work->new_state))
2303 goto out;
2304
2305 if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
2306 cma_exch(id_priv, RDMA_CM_DESTROYING);
2307 destroy = 1;
2308 }
2309 out:
2310 mutex_unlock(&id_priv->handler_mutex);
2311 cma_deref_id(id_priv);
2312 if (destroy)
2313 rdma_destroy_id(&id_priv->id);
2314 kfree(work);
2315 }
2316
2317 static void cma_ndev_work_handler(struct work_struct *_work)
2318 {
2319 struct cma_ndev_work *work = container_of(_work, struct cma_ndev_work, work);
2320 struct rdma_id_private *id_priv = work->id;
2321 int destroy = 0;
2322
2323 mutex_lock(&id_priv->handler_mutex);
2324 if (id_priv->state == RDMA_CM_DESTROYING ||
2325 id_priv->state == RDMA_CM_DEVICE_REMOVAL)
2326 goto out;
2327
2328 if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
2329 cma_exch(id_priv, RDMA_CM_DESTROYING);
2330 destroy = 1;
2331 }
2332
2333 out:
2334 mutex_unlock(&id_priv->handler_mutex);
2335 cma_deref_id(id_priv);
2336 if (destroy)
2337 rdma_destroy_id(&id_priv->id);
2338 kfree(work);
2339 }
2340
2341 static int cma_resolve_ib_route(struct rdma_id_private *id_priv, int timeout_ms)
2342 {
2343 struct rdma_route *route = &id_priv->id.route;
2344 struct cma_work *work;
2345 int ret;
2346
2347 work = kzalloc(sizeof *work, GFP_KERNEL);
2348 if (!work)
2349 return -ENOMEM;
2350
2351 work->id = id_priv;
2352 INIT_WORK(&work->work, cma_work_handler);
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
2357 route->path_rec = kmalloc(sizeof *route->path_rec, GFP_KERNEL);
2358 if (!route->path_rec) {
2359 ret = -ENOMEM;
2360 goto err1;
2361 }
2362
2363 ret = cma_query_ib_route(id_priv, timeout_ms, work);
2364 if (ret)
2365 goto err2;
2366
2367 return 0;
2368 err2:
2369 kfree(route->path_rec);
2370 route->path_rec = NULL;
2371 err1:
2372 kfree(work);
2373 return ret;
2374 }
2375
2376 int rdma_set_ib_paths(struct rdma_cm_id *id,
2377 struct ib_sa_path_rec *path_rec, int num_paths)
2378 {
2379 struct rdma_id_private *id_priv;
2380 int ret;
2381
2382 id_priv = container_of(id, struct rdma_id_private, id);
2383 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED,
2384 RDMA_CM_ROUTE_RESOLVED))
2385 return -EINVAL;
2386
2387 id->route.path_rec = kmemdup(path_rec, sizeof *path_rec * num_paths,
2388 GFP_KERNEL);
2389 if (!id->route.path_rec) {
2390 ret = -ENOMEM;
2391 goto err;
2392 }
2393
2394 id->route.num_paths = num_paths;
2395 return 0;
2396 err:
2397 cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_ADDR_RESOLVED);
2398 return ret;
2399 }
2400 EXPORT_SYMBOL(rdma_set_ib_paths);
2401
2402 static int cma_resolve_iw_route(struct rdma_id_private *id_priv, int timeout_ms)
2403 {
2404 struct cma_work *work;
2405
2406 work = kzalloc(sizeof *work, GFP_KERNEL);
2407 if (!work)
2408 return -ENOMEM;
2409
2410 work->id = id_priv;
2411 INIT_WORK(&work->work, cma_work_handler);
2412 work->old_state = RDMA_CM_ROUTE_QUERY;
2413 work->new_state = RDMA_CM_ROUTE_RESOLVED;
2414 work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
2415 queue_work(cma_wq, &work->work);
2416 return 0;
2417 }
2418
2419 static int iboe_tos_to_sl(struct net_device *ndev, int tos)
2420 {
2421 int prio;
2422 struct net_device *dev;
2423
2424 prio = rt_tos2priority(tos);
2425 dev = ndev->priv_flags & IFF_802_1Q_VLAN ?
2426 vlan_dev_real_dev(ndev) : ndev;
2427
2428 if (dev->num_tc)
2429 return netdev_get_prio_tc_map(dev, prio);
2430
2431 #if IS_ENABLED(CONFIG_VLAN_8021Q)
2432 if (ndev->priv_flags & IFF_802_1Q_VLAN)
2433 return (vlan_dev_get_egress_qos_mask(ndev, prio) &
2434 VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
2435 #endif
2436 return 0;
2437 }
2438
2439 static int cma_resolve_iboe_route(struct rdma_id_private *id_priv)
2440 {
2441 struct rdma_route *route = &id_priv->id.route;
2442 struct rdma_addr *addr = &route->addr;
2443 struct cma_work *work;
2444 int ret;
2445 struct net_device *ndev = NULL;
2446
2447
2448 work = kzalloc(sizeof *work, GFP_KERNEL);
2449 if (!work)
2450 return -ENOMEM;
2451
2452 work->id = id_priv;
2453 INIT_WORK(&work->work, cma_work_handler);
2454
2455 route->path_rec = kzalloc(sizeof *route->path_rec, GFP_KERNEL);
2456 if (!route->path_rec) {
2457 ret = -ENOMEM;
2458 goto err1;
2459 }
2460
2461 route->num_paths = 1;
2462
2463 if (addr->dev_addr.bound_dev_if) {
2464 ndev = dev_get_by_index(&init_net, addr->dev_addr.bound_dev_if);
2465 if (!ndev)
2466 return -ENODEV;
2467
2468 if (ndev->flags & IFF_LOOPBACK) {
2469 dev_put(ndev);
2470 if (!id_priv->id.device->get_netdev)
2471 return -EOPNOTSUPP;
2472
2473 ndev = id_priv->id.device->get_netdev(id_priv->id.device,
2474 id_priv->id.port_num);
2475 if (!ndev)
2476 return -ENODEV;
2477 }
2478
2479 route->path_rec->net = &init_net;
2480 route->path_rec->ifindex = ndev->ifindex;
2481 route->path_rec->gid_type = id_priv->gid_type;
2482 }
2483 if (!ndev) {
2484 ret = -ENODEV;
2485 goto err2;
2486 }
2487
2488 memcpy(route->path_rec->dmac, addr->dev_addr.dst_dev_addr, ETH_ALEN);
2489
2490 rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
2491 &route->path_rec->sgid);
2492 rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.dst_addr,
2493 &route->path_rec->dgid);
2494
2495 /* Use the hint from IP Stack to select GID Type */
2496 if (route->path_rec->gid_type < ib_network_to_gid_type(addr->dev_addr.network))
2497 route->path_rec->gid_type = ib_network_to_gid_type(addr->dev_addr.network);
2498 if (((struct sockaddr *)&id_priv->id.route.addr.dst_addr)->sa_family != AF_IB)
2499 /* TODO: get the hoplimit from the inet/inet6 device */
2500 route->path_rec->hop_limit = addr->dev_addr.hoplimit;
2501 else
2502 route->path_rec->hop_limit = 1;
2503 route->path_rec->reversible = 1;
2504 route->path_rec->pkey = cpu_to_be16(0xffff);
2505 route->path_rec->mtu_selector = IB_SA_EQ;
2506 route->path_rec->sl = iboe_tos_to_sl(ndev, id_priv->tos);
2507 route->path_rec->mtu = iboe_get_mtu(ndev->mtu);
2508 route->path_rec->rate_selector = IB_SA_EQ;
2509 route->path_rec->rate = iboe_get_rate(ndev);
2510 dev_put(ndev);
2511 route->path_rec->packet_life_time_selector = IB_SA_EQ;
2512 route->path_rec->packet_life_time = CMA_IBOE_PACKET_LIFETIME;
2513 if (!route->path_rec->mtu) {
2514 ret = -EINVAL;
2515 goto err2;
2516 }
2517
2518 work->old_state = RDMA_CM_ROUTE_QUERY;
2519 work->new_state = RDMA_CM_ROUTE_RESOLVED;
2520 work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
2521 work->event.status = 0;
2522
2523 queue_work(cma_wq, &work->work);
2524
2525 return 0;
2526
2527 err2:
2528 kfree(route->path_rec);
2529 route->path_rec = NULL;
2530 err1:
2531 kfree(work);
2532 return ret;
2533 }
2534
2535 int rdma_resolve_route(struct rdma_cm_id *id, int timeout_ms)
2536 {
2537 struct rdma_id_private *id_priv;
2538 int ret;
2539
2540 id_priv = container_of(id, struct rdma_id_private, id);
2541 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED, RDMA_CM_ROUTE_QUERY))
2542 return -EINVAL;
2543
2544 atomic_inc(&id_priv->refcount);
2545 if (rdma_cap_ib_sa(id->device, id->port_num))
2546 ret = cma_resolve_ib_route(id_priv, timeout_ms);
2547 else if (rdma_protocol_roce(id->device, id->port_num))
2548 ret = cma_resolve_iboe_route(id_priv);
2549 else if (rdma_protocol_iwarp(id->device, id->port_num))
2550 ret = cma_resolve_iw_route(id_priv, timeout_ms);
2551 else
2552 ret = -ENOSYS;
2553
2554 if (ret)
2555 goto err;
2556
2557 return 0;
2558 err:
2559 cma_comp_exch(id_priv, RDMA_CM_ROUTE_QUERY, RDMA_CM_ADDR_RESOLVED);
2560 cma_deref_id(id_priv);
2561 return ret;
2562 }
2563 EXPORT_SYMBOL(rdma_resolve_route);
2564
2565 static void cma_set_loopback(struct sockaddr *addr)
2566 {
2567 switch (addr->sa_family) {
2568 case AF_INET:
2569 ((struct sockaddr_in *) addr)->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
2570 break;
2571 case AF_INET6:
2572 ipv6_addr_set(&((struct sockaddr_in6 *) addr)->sin6_addr,
2573 0, 0, 0, htonl(1));
2574 break;
2575 default:
2576 ib_addr_set(&((struct sockaddr_ib *) addr)->sib_addr,
2577 0, 0, 0, htonl(1));
2578 break;
2579 }
2580 }
2581
2582 static int cma_bind_loopback(struct rdma_id_private *id_priv)
2583 {
2584 struct cma_device *cma_dev, *cur_dev;
2585 struct ib_port_attr port_attr;
2586 union ib_gid gid;
2587 u16 pkey;
2588 int ret;
2589 u8 p;
2590
2591 cma_dev = NULL;
2592 mutex_lock(&lock);
2593 list_for_each_entry(cur_dev, &dev_list, list) {
2594 if (cma_family(id_priv) == AF_IB &&
2595 !rdma_cap_ib_cm(cur_dev->device, 1))
2596 continue;
2597
2598 if (!cma_dev)
2599 cma_dev = cur_dev;
2600
2601 for (p = 1; p <= cur_dev->device->phys_port_cnt; ++p) {
2602 if (!ib_query_port(cur_dev->device, p, &port_attr) &&
2603 port_attr.state == IB_PORT_ACTIVE) {
2604 cma_dev = cur_dev;
2605 goto port_found;
2606 }
2607 }
2608 }
2609
2610 if (!cma_dev) {
2611 ret = -ENODEV;
2612 goto out;
2613 }
2614
2615 p = 1;
2616
2617 port_found:
2618 ret = ib_get_cached_gid(cma_dev->device, p, 0, &gid, NULL);
2619 if (ret)
2620 goto out;
2621
2622 ret = ib_get_cached_pkey(cma_dev->device, p, 0, &pkey);
2623 if (ret)
2624 goto out;
2625
2626 id_priv->id.route.addr.dev_addr.dev_type =
2627 (rdma_protocol_ib(cma_dev->device, p)) ?
2628 ARPHRD_INFINIBAND : ARPHRD_ETHER;
2629
2630 rdma_addr_set_sgid(&id_priv->id.route.addr.dev_addr, &gid);
2631 ib_addr_set_pkey(&id_priv->id.route.addr.dev_addr, pkey);
2632 id_priv->id.port_num = p;
2633 cma_attach_to_dev(id_priv, cma_dev);
2634 cma_set_loopback(cma_src_addr(id_priv));
2635 out:
2636 mutex_unlock(&lock);
2637 return ret;
2638 }
2639
2640 static void addr_handler(int status, struct sockaddr *src_addr,
2641 struct rdma_dev_addr *dev_addr, void *context)
2642 {
2643 struct rdma_id_private *id_priv = context;
2644 struct rdma_cm_event event;
2645
2646 memset(&event, 0, sizeof event);
2647 mutex_lock(&id_priv->handler_mutex);
2648 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY,
2649 RDMA_CM_ADDR_RESOLVED))
2650 goto out;
2651
2652 memcpy(cma_src_addr(id_priv), src_addr, rdma_addr_size(src_addr));
2653 if (!status && !id_priv->cma_dev)
2654 status = cma_acquire_dev(id_priv, NULL);
2655
2656 if (status) {
2657 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED,
2658 RDMA_CM_ADDR_BOUND))
2659 goto out;
2660 event.event = RDMA_CM_EVENT_ADDR_ERROR;
2661 event.status = status;
2662 } else
2663 event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
2664
2665 if (id_priv->id.event_handler(&id_priv->id, &event)) {
2666 cma_exch(id_priv, RDMA_CM_DESTROYING);
2667 mutex_unlock(&id_priv->handler_mutex);
2668 cma_deref_id(id_priv);
2669 rdma_destroy_id(&id_priv->id);
2670 return;
2671 }
2672 out:
2673 mutex_unlock(&id_priv->handler_mutex);
2674 cma_deref_id(id_priv);
2675 }
2676
2677 static int cma_resolve_loopback(struct rdma_id_private *id_priv)
2678 {
2679 struct cma_work *work;
2680 union ib_gid gid;
2681 int ret;
2682
2683 work = kzalloc(sizeof *work, GFP_KERNEL);
2684 if (!work)
2685 return -ENOMEM;
2686
2687 if (!id_priv->cma_dev) {
2688 ret = cma_bind_loopback(id_priv);
2689 if (ret)
2690 goto err;
2691 }
2692
2693 rdma_addr_get_sgid(&id_priv->id.route.addr.dev_addr, &gid);
2694 rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, &gid);
2695
2696 work->id = id_priv;
2697 INIT_WORK(&work->work, cma_work_handler);
2698 work->old_state = RDMA_CM_ADDR_QUERY;
2699 work->new_state = RDMA_CM_ADDR_RESOLVED;
2700 work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
2701 queue_work(cma_wq, &work->work);
2702 return 0;
2703 err:
2704 kfree(work);
2705 return ret;
2706 }
2707
2708 static int cma_resolve_ib_addr(struct rdma_id_private *id_priv)
2709 {
2710 struct cma_work *work;
2711 int ret;
2712
2713 work = kzalloc(sizeof *work, GFP_KERNEL);
2714 if (!work)
2715 return -ENOMEM;
2716
2717 if (!id_priv->cma_dev) {
2718 ret = cma_resolve_ib_dev(id_priv);
2719 if (ret)
2720 goto err;
2721 }
2722
2723 rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, (union ib_gid *)
2724 &(((struct sockaddr_ib *) &id_priv->id.route.addr.dst_addr)->sib_addr));
2725
2726 work->id = id_priv;
2727 INIT_WORK(&work->work, cma_work_handler);
2728 work->old_state = RDMA_CM_ADDR_QUERY;
2729 work->new_state = RDMA_CM_ADDR_RESOLVED;
2730 work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
2731 queue_work(cma_wq, &work->work);
2732 return 0;
2733 err:
2734 kfree(work);
2735 return ret;
2736 }
2737
2738 static int cma_bind_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
2739 struct sockaddr *dst_addr)
2740 {
2741 if (!src_addr || !src_addr->sa_family) {
2742 src_addr = (struct sockaddr *) &id->route.addr.src_addr;
2743 src_addr->sa_family = dst_addr->sa_family;
2744 if (dst_addr->sa_family == AF_INET6) {
2745 struct sockaddr_in6 *src_addr6 = (struct sockaddr_in6 *) src_addr;
2746 struct sockaddr_in6 *dst_addr6 = (struct sockaddr_in6 *) dst_addr;
2747 src_addr6->sin6_scope_id = dst_addr6->sin6_scope_id;
2748 if (ipv6_addr_type(&dst_addr6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
2749 id->route.addr.dev_addr.bound_dev_if = dst_addr6->sin6_scope_id;
2750 } else if (dst_addr->sa_family == AF_IB) {
2751 ((struct sockaddr_ib *) src_addr)->sib_pkey =
2752 ((struct sockaddr_ib *) dst_addr)->sib_pkey;
2753 }
2754 }
2755 return rdma_bind_addr(id, src_addr);
2756 }
2757
2758 int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
2759 struct sockaddr *dst_addr, int timeout_ms)
2760 {
2761 struct rdma_id_private *id_priv;
2762 int ret;
2763
2764 id_priv = container_of(id, struct rdma_id_private, id);
2765 if (id_priv->state == RDMA_CM_IDLE) {
2766 ret = cma_bind_addr(id, src_addr, dst_addr);
2767 if (ret)
2768 return ret;
2769 }
2770
2771 if (cma_family(id_priv) != dst_addr->sa_family)
2772 return -EINVAL;
2773
2774 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_ADDR_QUERY))
2775 return -EINVAL;
2776
2777 atomic_inc(&id_priv->refcount);
2778 memcpy(cma_dst_addr(id_priv), dst_addr, rdma_addr_size(dst_addr));
2779 if (cma_any_addr(dst_addr)) {
2780 ret = cma_resolve_loopback(id_priv);
2781 } else {
2782 if (dst_addr->sa_family == AF_IB) {
2783 ret = cma_resolve_ib_addr(id_priv);
2784 } else {
2785 ret = rdma_resolve_ip(&addr_client, cma_src_addr(id_priv),
2786 dst_addr, &id->route.addr.dev_addr,
2787 timeout_ms, addr_handler, id_priv);
2788 }
2789 }
2790 if (ret)
2791 goto err;
2792
2793 return 0;
2794 err:
2795 cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY, RDMA_CM_ADDR_BOUND);
2796 cma_deref_id(id_priv);
2797 return ret;
2798 }
2799 EXPORT_SYMBOL(rdma_resolve_addr);
2800
2801 int rdma_set_reuseaddr(struct rdma_cm_id *id, int reuse)
2802 {
2803 struct rdma_id_private *id_priv;
2804 unsigned long flags;
2805 int ret;
2806
2807 id_priv = container_of(id, struct rdma_id_private, id);
2808 spin_lock_irqsave(&id_priv->lock, flags);
2809 if (reuse || id_priv->state == RDMA_CM_IDLE) {
2810 id_priv->reuseaddr = reuse;
2811 ret = 0;
2812 } else {
2813 ret = -EINVAL;
2814 }
2815 spin_unlock_irqrestore(&id_priv->lock, flags);
2816 return ret;
2817 }
2818 EXPORT_SYMBOL(rdma_set_reuseaddr);
2819
2820 int rdma_set_afonly(struct rdma_cm_id *id, int afonly)
2821 {
2822 struct rdma_id_private *id_priv;
2823 unsigned long flags;
2824 int ret;
2825
2826 id_priv = container_of(id, struct rdma_id_private, id);
2827 spin_lock_irqsave(&id_priv->lock, flags);
2828 if (id_priv->state == RDMA_CM_IDLE || id_priv->state == RDMA_CM_ADDR_BOUND) {
2829 id_priv->options |= (1 << CMA_OPTION_AFONLY);
2830 id_priv->afonly = afonly;
2831 ret = 0;
2832 } else {
2833 ret = -EINVAL;
2834 }
2835 spin_unlock_irqrestore(&id_priv->lock, flags);
2836 return ret;
2837 }
2838 EXPORT_SYMBOL(rdma_set_afonly);
2839
2840 static void cma_bind_port(struct rdma_bind_list *bind_list,
2841 struct rdma_id_private *id_priv)
2842 {
2843 struct sockaddr *addr;
2844 struct sockaddr_ib *sib;
2845 u64 sid, mask;
2846 __be16 port;
2847
2848 addr = cma_src_addr(id_priv);
2849 port = htons(bind_list->port);
2850
2851 switch (addr->sa_family) {
2852 case AF_INET:
2853 ((struct sockaddr_in *) addr)->sin_port = port;
2854 break;
2855 case AF_INET6:
2856 ((struct sockaddr_in6 *) addr)->sin6_port = port;
2857 break;
2858 case AF_IB:
2859 sib = (struct sockaddr_ib *) addr;
2860 sid = be64_to_cpu(sib->sib_sid);
2861 mask = be64_to_cpu(sib->sib_sid_mask);
2862 sib->sib_sid = cpu_to_be64((sid & mask) | (u64) ntohs(port));
2863 sib->sib_sid_mask = cpu_to_be64(~0ULL);
2864 break;
2865 }
2866 id_priv->bind_list = bind_list;
2867 hlist_add_head(&id_priv->node, &bind_list->owners);
2868 }
2869
2870 static int cma_alloc_port(enum rdma_port_space ps,
2871 struct rdma_id_private *id_priv, unsigned short snum)
2872 {
2873 struct rdma_bind_list *bind_list;
2874 int ret;
2875
2876 bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL);
2877 if (!bind_list)
2878 return -ENOMEM;
2879
2880 ret = cma_ps_alloc(id_priv->id.route.addr.dev_addr.net, ps, bind_list,
2881 snum);
2882 if (ret < 0)
2883 goto err;
2884
2885 bind_list->ps = ps;
2886 bind_list->port = (unsigned short)ret;
2887 cma_bind_port(bind_list, id_priv);
2888 return 0;
2889 err:
2890 kfree(bind_list);
2891 return ret == -ENOSPC ? -EADDRNOTAVAIL : ret;
2892 }
2893
2894 static int cma_alloc_any_port(enum rdma_port_space ps,
2895 struct rdma_id_private *id_priv)
2896 {
2897 static unsigned int last_used_port;
2898 int low, high, remaining;
2899 unsigned int rover;
2900 struct net *net = id_priv->id.route.addr.dev_addr.net;
2901
2902 inet_get_local_port_range(net, &low, &high);
2903 remaining = (high - low) + 1;
2904 rover = prandom_u32() % remaining + low;
2905 retry:
2906 if (last_used_port != rover &&
2907 !cma_ps_find(net, ps, (unsigned short)rover)) {
2908 int ret = cma_alloc_port(ps, id_priv, rover);
2909 /*
2910 * Remember previously used port number in order to avoid
2911 * re-using same port immediately after it is closed.
2912 */
2913 if (!ret)
2914 last_used_port = rover;
2915 if (ret != -EADDRNOTAVAIL)
2916 return ret;
2917 }
2918 if (--remaining) {
2919 rover++;
2920 if ((rover < low) || (rover > high))
2921 rover = low;
2922 goto retry;
2923 }
2924 return -EADDRNOTAVAIL;
2925 }
2926
2927 /*
2928 * Check that the requested port is available. This is called when trying to
2929 * bind to a specific port, or when trying to listen on a bound port. In
2930 * the latter case, the provided id_priv may already be on the bind_list, but
2931 * we still need to check that it's okay to start listening.
2932 */
2933 static int cma_check_port(struct rdma_bind_list *bind_list,
2934 struct rdma_id_private *id_priv, uint8_t reuseaddr)
2935 {
2936 struct rdma_id_private *cur_id;
2937 struct sockaddr *addr, *cur_addr;
2938
2939 addr = cma_src_addr(id_priv);
2940 hlist_for_each_entry(cur_id, &bind_list->owners, node) {
2941 if (id_priv == cur_id)
2942 continue;
2943
2944 if ((cur_id->state != RDMA_CM_LISTEN) && reuseaddr &&
2945 cur_id->reuseaddr)
2946 continue;
2947
2948 cur_addr = cma_src_addr(cur_id);
2949 if (id_priv->afonly && cur_id->afonly &&
2950 (addr->sa_family != cur_addr->sa_family))
2951 continue;
2952
2953 if (cma_any_addr(addr) || cma_any_addr(cur_addr))
2954 return -EADDRNOTAVAIL;
2955
2956 if (!cma_addr_cmp(addr, cur_addr))
2957 return -EADDRINUSE;
2958 }
2959 return 0;
2960 }
2961
2962 static int cma_use_port(enum rdma_port_space ps,
2963 struct rdma_id_private *id_priv)
2964 {
2965 struct rdma_bind_list *bind_list;
2966 unsigned short snum;
2967 int ret;
2968
2969 snum = ntohs(cma_port(cma_src_addr(id_priv)));
2970 if (snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
2971 return -EACCES;
2972
2973 bind_list = cma_ps_find(id_priv->id.route.addr.dev_addr.net, ps, snum);
2974 if (!bind_list) {
2975 ret = cma_alloc_port(ps, id_priv, snum);
2976 } else {
2977 ret = cma_check_port(bind_list, id_priv, id_priv->reuseaddr);
2978 if (!ret)
2979 cma_bind_port(bind_list, id_priv);
2980 }
2981 return ret;
2982 }
2983
2984 static int cma_bind_listen(struct rdma_id_private *id_priv)
2985 {
2986 struct rdma_bind_list *bind_list = id_priv->bind_list;
2987 int ret = 0;
2988
2989 mutex_lock(&lock);
2990 if (bind_list->owners.first->next)
2991 ret = cma_check_port(bind_list, id_priv, 0);
2992 mutex_unlock(&lock);
2993 return ret;
2994 }
2995
2996 static enum rdma_port_space cma_select_inet_ps(
2997 struct rdma_id_private *id_priv)
2998 {
2999 switch (id_priv->id.ps) {
3000 case RDMA_PS_TCP:
3001 case RDMA_PS_UDP:
3002 case RDMA_PS_IPOIB:
3003 case RDMA_PS_IB:
3004 return id_priv->id.ps;
3005 default:
3006
3007 return 0;
3008 }
3009 }
3010
3011 static enum rdma_port_space cma_select_ib_ps(struct rdma_id_private *id_priv)
3012 {
3013 enum rdma_port_space ps = 0;
3014 struct sockaddr_ib *sib;
3015 u64 sid_ps, mask, sid;
3016
3017 sib = (struct sockaddr_ib *) cma_src_addr(id_priv);
3018 mask = be64_to_cpu(sib->sib_sid_mask) & RDMA_IB_IP_PS_MASK;
3019 sid = be64_to_cpu(sib->sib_sid) & mask;
3020
3021 if ((id_priv->id.ps == RDMA_PS_IB) && (sid == (RDMA_IB_IP_PS_IB & mask))) {
3022 sid_ps = RDMA_IB_IP_PS_IB;
3023 ps = RDMA_PS_IB;
3024 } else if (((id_priv->id.ps == RDMA_PS_IB) || (id_priv->id.ps == RDMA_PS_TCP)) &&
3025 (sid == (RDMA_IB_IP_PS_TCP & mask))) {
3026 sid_ps = RDMA_IB_IP_PS_TCP;
3027 ps = RDMA_PS_TCP;
3028 } else if (((id_priv->id.ps == RDMA_PS_IB) || (id_priv->id.ps == RDMA_PS_UDP)) &&
3029 (sid == (RDMA_IB_IP_PS_UDP & mask))) {
3030 sid_ps = RDMA_IB_IP_PS_UDP;
3031 ps = RDMA_PS_UDP;
3032 }
3033
3034 if (ps) {
3035 sib->sib_sid = cpu_to_be64(sid_ps | ntohs(cma_port((struct sockaddr *) sib)));
3036 sib->sib_sid_mask = cpu_to_be64(RDMA_IB_IP_PS_MASK |
3037 be64_to_cpu(sib->sib_sid_mask));
3038 }
3039 return ps;
3040 }
3041
3042 static int cma_get_port(struct rdma_id_private *id_priv)
3043 {
3044 enum rdma_port_space ps;
3045 int ret;
3046
3047 if (cma_family(id_priv) != AF_IB)
3048 ps = cma_select_inet_ps(id_priv);
3049 else
3050 ps = cma_select_ib_ps(id_priv);
3051 if (!ps)
3052 return -EPROTONOSUPPORT;
3053
3054 mutex_lock(&lock);
3055 if (cma_any_port(cma_src_addr(id_priv)))
3056 ret = cma_alloc_any_port(ps, id_priv);
3057 else
3058 ret = cma_use_port(ps, id_priv);
3059 mutex_unlock(&lock);
3060
3061 return ret;
3062 }
3063
3064 static int cma_check_linklocal(struct rdma_dev_addr *dev_addr,
3065 struct sockaddr *addr)
3066 {
3067 #if IS_ENABLED(CONFIG_IPV6)
3068 struct sockaddr_in6 *sin6;
3069
3070 if (addr->sa_family != AF_INET6)
3071 return 0;
3072
3073 sin6 = (struct sockaddr_in6 *) addr;
3074
3075 if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
3076 return 0;
3077
3078 if (!sin6->sin6_scope_id)
3079 return -EINVAL;
3080
3081 dev_addr->bound_dev_if = sin6->sin6_scope_id;
3082 #endif
3083 return 0;
3084 }
3085
3086 int rdma_listen(struct rdma_cm_id *id, int backlog)
3087 {
3088 struct rdma_id_private *id_priv;
3089 int ret;
3090
3091 id_priv = container_of(id, struct rdma_id_private, id);
3092 if (id_priv->state == RDMA_CM_IDLE) {
3093 id->route.addr.src_addr.ss_family = AF_INET;
3094 ret = rdma_bind_addr(id, cma_src_addr(id_priv));
3095 if (ret)
3096 return ret;
3097 }
3098
3099 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_LISTEN))
3100 return -EINVAL;
3101
3102 if (id_priv->reuseaddr) {
3103 ret = cma_bind_listen(id_priv);
3104 if (ret)
3105 goto err;
3106 }
3107
3108 id_priv->backlog = backlog;
3109 if (id->device) {
3110 if (rdma_cap_ib_cm(id->device, 1)) {
3111 ret = cma_ib_listen(id_priv);
3112 if (ret)
3113 goto err;
3114 } else if (rdma_cap_iw_cm(id->device, 1)) {
3115 ret = cma_iw_listen(id_priv, backlog);
3116 if (ret)
3117 goto err;
3118 } else {
3119 ret = -ENOSYS;
3120 goto err;
3121 }
3122 } else
3123 cma_listen_on_all(id_priv);
3124
3125 return 0;
3126 err:
3127 id_priv->backlog = 0;
3128 cma_comp_exch(id_priv, RDMA_CM_LISTEN, RDMA_CM_ADDR_BOUND);
3129 return ret;
3130 }
3131 EXPORT_SYMBOL(rdma_listen);
3132
3133 int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr)
3134 {
3135 struct rdma_id_private *id_priv;
3136 int ret;
3137
3138 if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6 &&
3139 addr->sa_family != AF_IB)
3140 return -EAFNOSUPPORT;
3141
3142 id_priv = container_of(id, struct rdma_id_private, id);
3143 if (!cma_comp_exch(id_priv, RDMA_CM_IDLE, RDMA_CM_ADDR_BOUND))
3144 return -EINVAL;
3145
3146 ret = cma_check_linklocal(&id->route.addr.dev_addr, addr);
3147 if (ret)
3148 goto err1;
3149
3150 memcpy(cma_src_addr(id_priv), addr, rdma_addr_size(addr));
3151 if (!cma_any_addr(addr)) {
3152 ret = cma_translate_addr(addr, &id->route.addr.dev_addr);
3153 if (ret)
3154 goto err1;
3155
3156 ret = cma_acquire_dev(id_priv, NULL);
3157 if (ret)
3158 goto err1;
3159 }
3160
3161 if (!(id_priv->options & (1 << CMA_OPTION_AFONLY))) {
3162 if (addr->sa_family == AF_INET)
3163 id_priv->afonly = 1;
3164 #if IS_ENABLED(CONFIG_IPV6)
3165 else if (addr->sa_family == AF_INET6) {
3166 struct net *net = id_priv->id.route.addr.dev_addr.net;
3167
3168 id_priv->afonly = net->ipv6.sysctl.bindv6only;
3169 }
3170 #endif
3171 }
3172 ret = cma_get_port(id_priv);
3173 if (ret)
3174 goto err2;
3175
3176 return 0;
3177 err2:
3178 if (id_priv->cma_dev)
3179 cma_release_dev(id_priv);
3180 err1:
3181 cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_IDLE);
3182 return ret;
3183 }
3184 EXPORT_SYMBOL(rdma_bind_addr);
3185
3186 static int cma_format_hdr(void *hdr, struct rdma_id_private *id_priv)
3187 {
3188 struct cma_hdr *cma_hdr;
3189
3190 cma_hdr = hdr;
3191 cma_hdr->cma_version = CMA_VERSION;
3192 if (cma_family(id_priv) == AF_INET) {
3193 struct sockaddr_in *src4, *dst4;
3194
3195 src4 = (struct sockaddr_in *) cma_src_addr(id_priv);
3196 dst4 = (struct sockaddr_in *) cma_dst_addr(id_priv);
3197
3198 cma_set_ip_ver(cma_hdr, 4);
3199 cma_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
3200 cma_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
3201 cma_hdr->port = src4->sin_port;
3202 } else if (cma_family(id_priv) == AF_INET6) {
3203 struct sockaddr_in6 *src6, *dst6;
3204
3205 src6 = (struct sockaddr_in6 *) cma_src_addr(id_priv);
3206 dst6 = (struct sockaddr_in6 *) cma_dst_addr(id_priv);
3207
3208 cma_set_ip_ver(cma_hdr, 6);
3209 cma_hdr->src_addr.ip6 = src6->sin6_addr;
3210 cma_hdr->dst_addr.ip6 = dst6->sin6_addr;
3211 cma_hdr->port = src6->sin6_port;
3212 }
3213 return 0;
3214 }
3215
3216 static int cma_sidr_rep_handler(struct ib_cm_id *cm_id,
3217 struct ib_cm_event *ib_event)
3218 {
3219 struct rdma_id_private *id_priv = cm_id->context;
3220 struct rdma_cm_event event;
3221 struct ib_cm_sidr_rep_event_param *rep = &ib_event->param.sidr_rep_rcvd;
3222 int ret = 0;
3223
3224 mutex_lock(&id_priv->handler_mutex);
3225 if (id_priv->state != RDMA_CM_CONNECT)
3226 goto out;
3227
3228 memset(&event, 0, sizeof event);
3229 switch (ib_event->event) {
3230 case IB_CM_SIDR_REQ_ERROR:
3231 event.event = RDMA_CM_EVENT_UNREACHABLE;
3232 event.status = -ETIMEDOUT;
3233 break;
3234 case IB_CM_SIDR_REP_RECEIVED:
3235 event.param.ud.private_data = ib_event->private_data;
3236 event.param.ud.private_data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
3237 if (rep->status != IB_SIDR_SUCCESS) {
3238 event.event = RDMA_CM_EVENT_UNREACHABLE;
3239 event.status = ib_event->param.sidr_rep_rcvd.status;
3240 break;
3241 }
3242 ret = cma_set_qkey(id_priv, rep->qkey);
3243 if (ret) {
3244 event.event = RDMA_CM_EVENT_ADDR_ERROR;
3245 event.status = ret;
3246 break;
3247 }
3248 ib_init_ah_from_path(id_priv->id.device, id_priv->id.port_num,
3249 id_priv->id.route.path_rec,
3250 &event.param.ud.ah_attr);
3251 event.param.ud.qp_num = rep->qpn;
3252 event.param.ud.qkey = rep->qkey;
3253 event.event = RDMA_CM_EVENT_ESTABLISHED;
3254 event.status = 0;
3255 break;
3256 default:
3257 pr_err("RDMA CMA: unexpected IB CM event: %d\n",
3258 ib_event->event);
3259 goto out;
3260 }
3261
3262 ret = id_priv->id.event_handler(&id_priv->id, &event);
3263 if (ret) {
3264 /* Destroy the CM ID by returning a non-zero value. */
3265 id_priv->cm_id.ib = NULL;
3266 cma_exch(id_priv, RDMA_CM_DESTROYING);
3267 mutex_unlock(&id_priv->handler_mutex);
3268 rdma_destroy_id(&id_priv->id);
3269 return ret;
3270 }
3271 out:
3272 mutex_unlock(&id_priv->handler_mutex);
3273 return ret;
3274 }
3275
3276 static int cma_resolve_ib_udp(struct rdma_id_private *id_priv,
3277 struct rdma_conn_param *conn_param)
3278 {
3279 struct ib_cm_sidr_req_param req;
3280 struct ib_cm_id *id;
3281 void *private_data;
3282 int offset, ret;
3283
3284 memset(&req, 0, sizeof req);
3285 offset = cma_user_data_offset(id_priv);
3286 req.private_data_len = offset + conn_param->private_data_len;
3287 if (req.private_data_len < conn_param->private_data_len)
3288 return -EINVAL;
3289
3290 if (req.private_data_len) {
3291 private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
3292 if (!private_data)
3293 return -ENOMEM;
3294 } else {
3295 private_data = NULL;
3296 }
3297
3298 if (conn_param->private_data && conn_param->private_data_len)
3299 memcpy(private_data + offset, conn_param->private_data,
3300 conn_param->private_data_len);
3301
3302 if (private_data) {
3303 ret = cma_format_hdr(private_data, id_priv);
3304 if (ret)
3305 goto out;
3306 req.private_data = private_data;
3307 }
3308
3309 id = ib_create_cm_id(id_priv->id.device, cma_sidr_rep_handler,
3310 id_priv);
3311 if (IS_ERR(id)) {
3312 ret = PTR_ERR(id);
3313 goto out;
3314 }
3315 id_priv->cm_id.ib = id;
3316
3317 req.path = id_priv->id.route.path_rec;
3318 req.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
3319 req.timeout_ms = 1 << (CMA_CM_RESPONSE_TIMEOUT - 8);
3320 req.max_cm_retries = CMA_MAX_CM_RETRIES;
3321
3322 ret = ib_send_cm_sidr_req(id_priv->cm_id.ib, &req);
3323 if (ret) {
3324 ib_destroy_cm_id(id_priv->cm_id.ib);
3325 id_priv->cm_id.ib = NULL;
3326 }
3327 out:
3328 kfree(private_data);
3329 return ret;
3330 }
3331
3332 static int cma_connect_ib(struct rdma_id_private *id_priv,
3333 struct rdma_conn_param *conn_param)
3334 {
3335 struct ib_cm_req_param req;
3336 struct rdma_route *route;
3337 void *private_data;
3338 struct ib_cm_id *id;
3339 int offset, ret;
3340
3341 memset(&req, 0, sizeof req);
3342 offset = cma_user_data_offset(id_priv);
3343 req.private_data_len = offset + conn_param->private_data_len;
3344 if (req.private_data_len < conn_param->private_data_len)
3345 return -EINVAL;
3346
3347 if (req.private_data_len) {
3348 private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
3349 if (!private_data)
3350 return -ENOMEM;
3351 } else {
3352 private_data = NULL;
3353 }
3354
3355 if (conn_param->private_data && conn_param->private_data_len)
3356 memcpy(private_data + offset, conn_param->private_data,
3357 conn_param->private_data_len);
3358
3359 id = ib_create_cm_id(id_priv->id.device, cma_ib_handler, id_priv);
3360 if (IS_ERR(id)) {
3361 ret = PTR_ERR(id);
3362 goto out;
3363 }
3364 id_priv->cm_id.ib = id;
3365
3366 route = &id_priv->id.route;
3367 if (private_data) {
3368 ret = cma_format_hdr(private_data, id_priv);
3369 if (ret)
3370 goto out;
3371 req.private_data = private_data;
3372 }
3373
3374 req.primary_path = &route->path_rec[0];
3375 if (route->num_paths == 2)
3376 req.alternate_path = &route->path_rec[1];
3377
3378 req.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
3379 req.qp_num = id_priv->qp_num;
3380 req.qp_type = id_priv->id.qp_type;
3381 req.starting_psn = id_priv->seq_num;
3382 req.responder_resources = conn_param->responder_resources;
3383 req.initiator_depth = conn_param->initiator_depth;
3384 req.flow_control = conn_param->flow_control;
3385 req.retry_count = min_t(u8, 7, conn_param->retry_count);
3386 req.rnr_retry_count = min_t(u8, 7, conn_param->rnr_retry_count);
3387 req.remote_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
3388 req.local_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
3389 req.max_cm_retries = CMA_MAX_CM_RETRIES;
3390 req.srq = id_priv->srq ? 1 : 0;
3391
3392 ret = ib_send_cm_req(id_priv->cm_id.ib, &req);
3393 out:
3394 if (ret && !IS_ERR(id)) {
3395 ib_destroy_cm_id(id);
3396 id_priv->cm_id.ib = NULL;
3397 }
3398
3399 kfree(private_data);
3400 return ret;
3401 }
3402
3403 static int cma_connect_iw(struct rdma_id_private *id_priv,
3404 struct rdma_conn_param *conn_param)
3405 {
3406 struct iw_cm_id *cm_id;
3407 int ret;
3408 struct iw_cm_conn_param iw_param;
3409
3410 cm_id = iw_create_cm_id(id_priv->id.device, cma_iw_handler, id_priv);
3411 if (IS_ERR(cm_id))
3412 return PTR_ERR(cm_id);
3413
3414 cm_id->tos = id_priv->tos;
3415 id_priv->cm_id.iw = cm_id;
3416
3417 memcpy(&cm_id->local_addr, cma_src_addr(id_priv),
3418 rdma_addr_size(cma_src_addr(id_priv)));
3419 memcpy(&cm_id->remote_addr, cma_dst_addr(id_priv),
3420 rdma_addr_size(cma_dst_addr(id_priv)));
3421
3422 ret = cma_modify_qp_rtr(id_priv, conn_param);
3423 if (ret)
3424 goto out;
3425
3426 if (conn_param) {
3427 iw_param.ord = conn_param->initiator_depth;
3428 iw_param.ird = conn_param->responder_resources;
3429 iw_param.private_data = conn_param->private_data;
3430 iw_param.private_data_len = conn_param->private_data_len;
3431 iw_param.qpn = id_priv->id.qp ? id_priv->qp_num : conn_param->qp_num;
3432 } else {
3433 memset(&iw_param, 0, sizeof iw_param);
3434 iw_param.qpn = id_priv->qp_num;
3435 }
3436 ret = iw_cm_connect(cm_id, &iw_param);
3437 out:
3438 if (ret) {
3439 iw_destroy_cm_id(cm_id);
3440 id_priv->cm_id.iw = NULL;
3441 }
3442 return ret;
3443 }
3444
3445 int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
3446 {
3447 struct rdma_id_private *id_priv;
3448 int ret;
3449
3450 id_priv = container_of(id, struct rdma_id_private, id);
3451 if (!cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_CONNECT))
3452 return -EINVAL;
3453
3454 if (!id->qp) {
3455 id_priv->qp_num = conn_param->qp_num;
3456 id_priv->srq = conn_param->srq;
3457 }
3458
3459 if (rdma_cap_ib_cm(id->device, id->port_num)) {
3460 if (id->qp_type == IB_QPT_UD)
3461 ret = cma_resolve_ib_udp(id_priv, conn_param);
3462 else
3463 ret = cma_connect_ib(id_priv, conn_param);
3464 } else if (rdma_cap_iw_cm(id->device, id->port_num))
3465 ret = cma_connect_iw(id_priv, conn_param);
3466 else
3467 ret = -ENOSYS;
3468 if (ret)
3469 goto err;
3470
3471 return 0;
3472 err:
3473 cma_comp_exch(id_priv, RDMA_CM_CONNECT, RDMA_CM_ROUTE_RESOLVED);
3474 return ret;
3475 }
3476 EXPORT_SYMBOL(rdma_connect);
3477
3478 static int cma_accept_ib(struct rdma_id_private *id_priv,
3479 struct rdma_conn_param *conn_param)
3480 {
3481 struct ib_cm_rep_param rep;
3482 int ret;
3483
3484 ret = cma_modify_qp_rtr(id_priv, conn_param);
3485 if (ret)
3486 goto out;
3487
3488 ret = cma_modify_qp_rts(id_priv, conn_param);
3489 if (ret)
3490 goto out;
3491
3492 memset(&rep, 0, sizeof rep);
3493 rep.qp_num = id_priv->qp_num;
3494 rep.starting_psn = id_priv->seq_num;
3495 rep.private_data = conn_param->private_data;
3496 rep.private_data_len = conn_param->private_data_len;
3497 rep.responder_resources = conn_param->responder_resources;
3498 rep.initiator_depth = conn_param->initiator_depth;
3499 rep.failover_accepted = 0;
3500 rep.flow_control = conn_param->flow_control;
3501 rep.rnr_retry_count = min_t(u8, 7, conn_param->rnr_retry_count);
3502 rep.srq = id_priv->srq ? 1 : 0;
3503
3504 ret = ib_send_cm_rep(id_priv->cm_id.ib, &rep);
3505 out:
3506 return ret;
3507 }
3508
3509 static int cma_accept_iw(struct rdma_id_private *id_priv,
3510 struct rdma_conn_param *conn_param)
3511 {
3512 struct iw_cm_conn_param iw_param;
3513 int ret;
3514
3515 ret = cma_modify_qp_rtr(id_priv, conn_param);
3516 if (ret)
3517 return ret;
3518
3519 iw_param.ord = conn_param->initiator_depth;
3520 iw_param.ird = conn_param->responder_resources;
3521 iw_param.private_data = conn_param->private_data;
3522 iw_param.private_data_len = conn_param->private_data_len;
3523 if (id_priv->id.qp) {
3524 iw_param.qpn = id_priv->qp_num;
3525 } else
3526 iw_param.qpn = conn_param->qp_num;
3527
3528 return iw_cm_accept(id_priv->cm_id.iw, &iw_param);
3529 }
3530
3531 static int cma_send_sidr_rep(struct rdma_id_private *id_priv,
3532 enum ib_cm_sidr_status status, u32 qkey,
3533 const void *private_data, int private_data_len)
3534 {
3535 struct ib_cm_sidr_rep_param rep;
3536 int ret;
3537
3538 memset(&rep, 0, sizeof rep);
3539 rep.status = status;
3540 if (status == IB_SIDR_SUCCESS) {
3541 ret = cma_set_qkey(id_priv, qkey);
3542 if (ret)
3543 return ret;
3544 rep.qp_num = id_priv->qp_num;
3545 rep.qkey = id_priv->qkey;
3546 }
3547 rep.private_data = private_data;
3548 rep.private_data_len = private_data_len;
3549
3550 return ib_send_cm_sidr_rep(id_priv->cm_id.ib, &rep);
3551 }
3552
3553 int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
3554 {
3555 struct rdma_id_private *id_priv;
3556 int ret;
3557
3558 id_priv = container_of(id, struct rdma_id_private, id);
3559
3560 id_priv->owner = task_pid_nr(current);
3561
3562 if (!cma_comp(id_priv, RDMA_CM_CONNECT))
3563 return -EINVAL;
3564
3565 if (!id->qp && conn_param) {
3566 id_priv->qp_num = conn_param->qp_num;
3567 id_priv->srq = conn_param->srq;
3568 }
3569
3570 if (rdma_cap_ib_cm(id->device, id->port_num)) {
3571 if (id->qp_type == IB_QPT_UD) {
3572 if (conn_param)
3573 ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
3574 conn_param->qkey,
3575 conn_param->private_data,
3576 conn_param->private_data_len);
3577 else
3578 ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
3579 0, NULL, 0);
3580 } else {
3581 if (conn_param)
3582 ret = cma_accept_ib(id_priv, conn_param);
3583 else
3584 ret = cma_rep_recv(id_priv);
3585 }
3586 } else if (rdma_cap_iw_cm(id->device, id->port_num))
3587 ret = cma_accept_iw(id_priv, conn_param);
3588 else
3589 ret = -ENOSYS;
3590
3591 if (ret)
3592 goto reject;
3593
3594 return 0;
3595 reject:
3596 cma_modify_qp_err(id_priv);
3597 rdma_reject(id, NULL, 0);
3598 return ret;
3599 }
3600 EXPORT_SYMBOL(rdma_accept);
3601
3602 int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event)
3603 {
3604 struct rdma_id_private *id_priv;
3605 int ret;
3606
3607 id_priv = container_of(id, struct rdma_id_private, id);
3608 if (!id_priv->cm_id.ib)
3609 return -EINVAL;
3610
3611 switch (id->device->node_type) {
3612 case RDMA_NODE_IB_CA:
3613 ret = ib_cm_notify(id_priv->cm_id.ib, event);
3614 break;
3615 default:
3616 ret = 0;
3617 break;
3618 }
3619 return ret;
3620 }
3621 EXPORT_SYMBOL(rdma_notify);
3622
3623 int rdma_reject(struct rdma_cm_id *id, const void *private_data,
3624 u8 private_data_len)
3625 {
3626 struct rdma_id_private *id_priv;
3627 int ret;
3628
3629 id_priv = container_of(id, struct rdma_id_private, id);
3630 if (!id_priv->cm_id.ib)
3631 return -EINVAL;
3632
3633 if (rdma_cap_ib_cm(id->device, id->port_num)) {
3634 if (id->qp_type == IB_QPT_UD)
3635 ret = cma_send_sidr_rep(id_priv, IB_SIDR_REJECT, 0,
3636 private_data, private_data_len);
3637 else
3638 ret = ib_send_cm_rej(id_priv->cm_id.ib,
3639 IB_CM_REJ_CONSUMER_DEFINED, NULL,
3640 0, private_data, private_data_len);
3641 } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
3642 ret = iw_cm_reject(id_priv->cm_id.iw,
3643 private_data, private_data_len);
3644 } else
3645 ret = -ENOSYS;
3646
3647 return ret;
3648 }
3649 EXPORT_SYMBOL(rdma_reject);
3650
3651 int rdma_disconnect(struct rdma_cm_id *id)
3652 {
3653 struct rdma_id_private *id_priv;
3654 int ret;
3655
3656 id_priv = container_of(id, struct rdma_id_private, id);
3657 if (!id_priv->cm_id.ib)
3658 return -EINVAL;
3659
3660 if (rdma_cap_ib_cm(id->device, id->port_num)) {
3661 ret = cma_modify_qp_err(id_priv);
3662 if (ret)
3663 goto out;
3664 /* Initiate or respond to a disconnect. */
3665 if (ib_send_cm_dreq(id_priv->cm_id.ib, NULL, 0))
3666 ib_send_cm_drep(id_priv->cm_id.ib, NULL, 0);
3667 } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
3668 ret = iw_cm_disconnect(id_priv->cm_id.iw, 0);
3669 } else
3670 ret = -EINVAL;
3671
3672 out:
3673 return ret;
3674 }
3675 EXPORT_SYMBOL(rdma_disconnect);
3676
3677 static int cma_ib_mc_handler(int status, struct ib_sa_multicast *multicast)
3678 {
3679 struct rdma_id_private *id_priv;
3680 struct cma_multicast *mc = multicast->context;
3681 struct rdma_cm_event event;
3682 int ret = 0;
3683
3684 id_priv = mc->id_priv;
3685 mutex_lock(&id_priv->handler_mutex);
3686 if (id_priv->state != RDMA_CM_ADDR_BOUND &&
3687 id_priv->state != RDMA_CM_ADDR_RESOLVED)
3688 goto out;
3689
3690 if (!status)
3691 status = cma_set_qkey(id_priv, be32_to_cpu(multicast->rec.qkey));
3692 mutex_lock(&id_priv->qp_mutex);
3693 if (!status && id_priv->id.qp)
3694 status = ib_attach_mcast(id_priv->id.qp, &multicast->rec.mgid,
3695 be16_to_cpu(multicast->rec.mlid));
3696 mutex_unlock(&id_priv->qp_mutex);
3697
3698 memset(&event, 0, sizeof event);
3699 event.status = status;
3700 event.param.ud.private_data = mc->context;
3701 if (!status) {
3702 struct rdma_dev_addr *dev_addr =
3703 &id_priv->id.route.addr.dev_addr;
3704 struct net_device *ndev =
3705 dev_get_by_index(&init_net, dev_addr->bound_dev_if);
3706 enum ib_gid_type gid_type =
3707 id_priv->cma_dev->default_gid_type[id_priv->id.port_num -
3708 rdma_start_port(id_priv->cma_dev->device)];
3709
3710 event.event = RDMA_CM_EVENT_MULTICAST_JOIN;
3711 ib_init_ah_from_mcmember(id_priv->id.device,
3712 id_priv->id.port_num, &multicast->rec,
3713 ndev, gid_type,
3714 &event.param.ud.ah_attr);
3715 event.param.ud.qp_num = 0xFFFFFF;
3716 event.param.ud.qkey = be32_to_cpu(multicast->rec.qkey);
3717 if (ndev)
3718 dev_put(ndev);
3719 } else
3720 event.event = RDMA_CM_EVENT_MULTICAST_ERROR;
3721
3722 ret = id_priv->id.event_handler(&id_priv->id, &event);
3723 if (ret) {
3724 cma_exch(id_priv, RDMA_CM_DESTROYING);
3725 mutex_unlock(&id_priv->handler_mutex);
3726 rdma_destroy_id(&id_priv->id);
3727 return 0;
3728 }
3729
3730 out:
3731 mutex_unlock(&id_priv->handler_mutex);
3732 return 0;
3733 }
3734
3735 static void cma_set_mgid(struct rdma_id_private *id_priv,
3736 struct sockaddr *addr, union ib_gid *mgid)
3737 {
3738 unsigned char mc_map[MAX_ADDR_LEN];
3739 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
3740 struct sockaddr_in *sin = (struct sockaddr_in *) addr;
3741 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) addr;
3742
3743 if (cma_any_addr(addr)) {
3744 memset(mgid, 0, sizeof *mgid);
3745 } else if ((addr->sa_family == AF_INET6) &&
3746 ((be32_to_cpu(sin6->sin6_addr.s6_addr32[0]) & 0xFFF0FFFF) ==
3747 0xFF10A01B)) {
3748 /* IPv6 address is an SA assigned MGID. */
3749 memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
3750 } else if (addr->sa_family == AF_IB) {
3751 memcpy(mgid, &((struct sockaddr_ib *) addr)->sib_addr, sizeof *mgid);
3752 } else if ((addr->sa_family == AF_INET6)) {
3753 ipv6_ib_mc_map(&sin6->sin6_addr, dev_addr->broadcast, mc_map);
3754 if (id_priv->id.ps == RDMA_PS_UDP)
3755 mc_map[7] = 0x01; /* Use RDMA CM signature */
3756 *mgid = *(union ib_gid *) (mc_map + 4);
3757 } else {
3758 ip_ib_mc_map(sin->sin_addr.s_addr, dev_addr->broadcast, mc_map);
3759 if (id_priv->id.ps == RDMA_PS_UDP)
3760 mc_map[7] = 0x01; /* Use RDMA CM signature */
3761 *mgid = *(union ib_gid *) (mc_map + 4);
3762 }
3763 }
3764
3765 static void cma_query_sa_classport_info_cb(int status,
3766 struct ib_class_port_info *rec,
3767 void *context)
3768 {
3769 struct class_port_info_context *cb_ctx = context;
3770
3771 WARN_ON(!context);
3772
3773 if (status || !rec) {
3774 pr_debug("RDMA CM: %s port %u failed query ClassPortInfo status: %d\n",
3775 cb_ctx->device->name, cb_ctx->port_num, status);
3776 goto out;
3777 }
3778
3779 memcpy(cb_ctx->class_port_info, rec, sizeof(struct ib_class_port_info));
3780
3781 out:
3782 complete(&cb_ctx->done);
3783 }
3784
3785 static int cma_query_sa_classport_info(struct ib_device *device, u8 port_num,
3786 struct ib_class_port_info *class_port_info)
3787 {
3788 struct class_port_info_context *cb_ctx;
3789 int ret;
3790
3791 cb_ctx = kmalloc(sizeof(*cb_ctx), GFP_KERNEL);
3792 if (!cb_ctx)
3793 return -ENOMEM;
3794
3795 cb_ctx->device = device;
3796 cb_ctx->class_port_info = class_port_info;
3797 cb_ctx->port_num = port_num;
3798 init_completion(&cb_ctx->done);
3799
3800 ret = ib_sa_classport_info_rec_query(&sa_client, device, port_num,
3801 CMA_QUERY_CLASSPORT_INFO_TIMEOUT,
3802 GFP_KERNEL, cma_query_sa_classport_info_cb,
3803 cb_ctx, &cb_ctx->sa_query);
3804 if (ret < 0) {
3805 pr_err("RDMA CM: %s port %u failed to send ClassPortInfo query, ret: %d\n",
3806 device->name, port_num, ret);
3807 goto out;
3808 }
3809
3810 wait_for_completion(&cb_ctx->done);
3811
3812 out:
3813 kfree(cb_ctx);
3814 return ret;
3815 }
3816
3817 static int cma_join_ib_multicast(struct rdma_id_private *id_priv,
3818 struct cma_multicast *mc)
3819 {
3820 struct ib_sa_mcmember_rec rec;
3821 struct ib_class_port_info class_port_info;
3822 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
3823 ib_sa_comp_mask comp_mask;
3824 int ret;
3825
3826 ib_addr_get_mgid(dev_addr, &rec.mgid);
3827 ret = ib_sa_get_mcmember_rec(id_priv->id.device, id_priv->id.port_num,
3828 &rec.mgid, &rec);
3829 if (ret)
3830 return ret;
3831
3832 ret = cma_set_qkey(id_priv, 0);
3833 if (ret)
3834 return ret;
3835
3836 cma_set_mgid(id_priv, (struct sockaddr *) &mc->addr, &rec.mgid);
3837 rec.qkey = cpu_to_be32(id_priv->qkey);
3838 rdma_addr_get_sgid(dev_addr, &rec.port_gid);
3839 rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
3840 rec.join_state = mc->join_state;
3841
3842 if (rec.join_state == BIT(SENDONLY_FULLMEMBER_JOIN)) {
3843 ret = cma_query_sa_classport_info(id_priv->id.device,
3844 id_priv->id.port_num,
3845 &class_port_info);
3846
3847 if (ret)
3848 return ret;
3849
3850 if (!(ib_get_cpi_capmask2(&class_port_info) &
3851 IB_SA_CAP_MASK2_SENDONLY_FULL_MEM_SUPPORT)) {
3852 pr_warn("RDMA CM: %s port %u Unable to multicast join\n"
3853 "RDMA CM: SM doesn't support Send Only Full Member option\n",
3854 id_priv->id.device->name, id_priv->id.port_num);
3855 return -EOPNOTSUPP;
3856 }
3857 }
3858
3859 comp_mask = IB_SA_MCMEMBER_REC_MGID | IB_SA_MCMEMBER_REC_PORT_GID |
3860 IB_SA_MCMEMBER_REC_PKEY | IB_SA_MCMEMBER_REC_JOIN_STATE |
3861 IB_SA_MCMEMBER_REC_QKEY | IB_SA_MCMEMBER_REC_SL |
3862 IB_SA_MCMEMBER_REC_FLOW_LABEL |
3863 IB_SA_MCMEMBER_REC_TRAFFIC_CLASS;
3864
3865 if (id_priv->id.ps == RDMA_PS_IPOIB)
3866 comp_mask |= IB_SA_MCMEMBER_REC_RATE |
3867 IB_SA_MCMEMBER_REC_RATE_SELECTOR |
3868 IB_SA_MCMEMBER_REC_MTU_SELECTOR |
3869 IB_SA_MCMEMBER_REC_MTU |
3870 IB_SA_MCMEMBER_REC_HOP_LIMIT;
3871
3872 mc->multicast.ib = ib_sa_join_multicast(&sa_client, id_priv->id.device,
3873 id_priv->id.port_num, &rec,
3874 comp_mask, GFP_KERNEL,
3875 cma_ib_mc_handler, mc);
3876 return PTR_ERR_OR_ZERO(mc->multicast.ib);
3877 }
3878
3879 static void iboe_mcast_work_handler(struct work_struct *work)
3880 {
3881 struct iboe_mcast_work *mw = container_of(work, struct iboe_mcast_work, work);
3882 struct cma_multicast *mc = mw->mc;
3883 struct ib_sa_multicast *m = mc->multicast.ib;
3884
3885 mc->multicast.ib->context = mc;
3886 cma_ib_mc_handler(0, m);
3887 kref_put(&mc->mcref, release_mc);
3888 kfree(mw);
3889 }
3890
3891 static void cma_iboe_set_mgid(struct sockaddr *addr, union ib_gid *mgid)
3892 {
3893 struct sockaddr_in *sin = (struct sockaddr_in *)addr;
3894 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr;
3895
3896 if (cma_any_addr(addr)) {
3897 memset(mgid, 0, sizeof *mgid);
3898 } else if (addr->sa_family == AF_INET6) {
3899 memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
3900 } else {
3901 mgid->raw[0] = 0xff;
3902 mgid->raw[1] = 0x0e;
3903 mgid->raw[2] = 0;
3904 mgid->raw[3] = 0;
3905 mgid->raw[4] = 0;
3906 mgid->raw[5] = 0;
3907 mgid->raw[6] = 0;
3908 mgid->raw[7] = 0;
3909 mgid->raw[8] = 0;
3910 mgid->raw[9] = 0;
3911 mgid->raw[10] = 0xff;
3912 mgid->raw[11] = 0xff;
3913 *(__be32 *)(&mgid->raw[12]) = sin->sin_addr.s_addr;
3914 }
3915 }
3916
3917 static int cma_iboe_join_multicast(struct rdma_id_private *id_priv,
3918 struct cma_multicast *mc)
3919 {
3920 struct iboe_mcast_work *work;
3921 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
3922 int err = 0;
3923 struct sockaddr *addr = (struct sockaddr *)&mc->addr;
3924 struct net_device *ndev = NULL;
3925 enum ib_gid_type gid_type;
3926 bool send_only;
3927
3928 send_only = mc->join_state == BIT(SENDONLY_FULLMEMBER_JOIN);
3929
3930 if (cma_zero_addr((struct sockaddr *)&mc->addr))
3931 return -EINVAL;
3932
3933 work = kzalloc(sizeof *work, GFP_KERNEL);
3934 if (!work)
3935 return -ENOMEM;
3936
3937 mc->multicast.ib = kzalloc(sizeof(struct ib_sa_multicast), GFP_KERNEL);
3938 if (!mc->multicast.ib) {
3939 err = -ENOMEM;
3940 goto out1;
3941 }
3942
3943 cma_iboe_set_mgid(addr, &mc->multicast.ib->rec.mgid);
3944
3945 mc->multicast.ib->rec.pkey = cpu_to_be16(0xffff);
3946 if (id_priv->id.ps == RDMA_PS_UDP)
3947 mc->multicast.ib->rec.qkey = cpu_to_be32(RDMA_UDP_QKEY);
3948
3949 if (dev_addr->bound_dev_if)
3950 ndev = dev_get_by_index(&init_net, dev_addr->bound_dev_if);
3951 if (!ndev) {
3952 err = -ENODEV;
3953 goto out2;
3954 }
3955 mc->multicast.ib->rec.rate = iboe_get_rate(ndev);
3956 mc->multicast.ib->rec.hop_limit = 1;
3957 mc->multicast.ib->rec.mtu = iboe_get_mtu(ndev->mtu);
3958
3959 gid_type = id_priv->cma_dev->default_gid_type[id_priv->id.port_num -
3960 rdma_start_port(id_priv->cma_dev->device)];
3961 if (addr->sa_family == AF_INET) {
3962 if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) {
3963 mc->multicast.ib->rec.hop_limit = IPV6_DEFAULT_HOPLIMIT;
3964 if (!send_only) {
3965 err = cma_igmp_send(ndev, &mc->multicast.ib->rec.mgid,
3966 true);
3967 if (!err)
3968 mc->igmp_joined = true;
3969 }
3970 }
3971 } else {
3972 if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP)
3973 err = -ENOTSUPP;
3974 }
3975 dev_put(ndev);
3976 if (err || !mc->multicast.ib->rec.mtu) {
3977 if (!err)
3978 err = -EINVAL;
3979 goto out2;
3980 }
3981 rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
3982 &mc->multicast.ib->rec.port_gid);
3983 work->id = id_priv;
3984 work->mc = mc;
3985 INIT_WORK(&work->work, iboe_mcast_work_handler);
3986 kref_get(&mc->mcref);
3987 queue_work(cma_wq, &work->work);
3988
3989 return 0;
3990
3991 out2:
3992 kfree(mc->multicast.ib);
3993 out1:
3994 kfree(work);
3995 return err;
3996 }
3997
3998 int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
3999 u8 join_state, void *context)
4000 {
4001 struct rdma_id_private *id_priv;
4002 struct cma_multicast *mc;
4003 int ret;
4004
4005 id_priv = container_of(id, struct rdma_id_private, id);
4006 if (!cma_comp(id_priv, RDMA_CM_ADDR_BOUND) &&
4007 !cma_comp(id_priv, RDMA_CM_ADDR_RESOLVED))
4008 return -EINVAL;
4009
4010 mc = kmalloc(sizeof *mc, GFP_KERNEL);
4011 if (!mc)
4012 return -ENOMEM;
4013
4014 memcpy(&mc->addr, addr, rdma_addr_size(addr));
4015 mc->context = context;
4016 mc->id_priv = id_priv;
4017 mc->igmp_joined = false;
4018 mc->join_state = join_state;
4019 spin_lock(&id_priv->lock);
4020 list_add(&mc->list, &id_priv->mc_list);
4021 spin_unlock(&id_priv->lock);
4022
4023 if (rdma_protocol_roce(id->device, id->port_num)) {
4024 kref_init(&mc->mcref);
4025 ret = cma_iboe_join_multicast(id_priv, mc);
4026 } else if (rdma_cap_ib_mcast(id->device, id->port_num))
4027 ret = cma_join_ib_multicast(id_priv, mc);
4028 else
4029 ret = -ENOSYS;
4030
4031 if (ret) {
4032 spin_lock_irq(&id_priv->lock);
4033 list_del(&mc->list);
4034 spin_unlock_irq(&id_priv->lock);
4035 kfree(mc);
4036 }
4037 return ret;
4038 }
4039 EXPORT_SYMBOL(rdma_join_multicast);
4040
4041 void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr)
4042 {
4043 struct rdma_id_private *id_priv;
4044 struct cma_multicast *mc;
4045
4046 id_priv = container_of(id, struct rdma_id_private, id);
4047 spin_lock_irq(&id_priv->lock);
4048 list_for_each_entry(mc, &id_priv->mc_list, list) {
4049 if (!memcmp(&mc->addr, addr, rdma_addr_size(addr))) {
4050 list_del(&mc->list);
4051 spin_unlock_irq(&id_priv->lock);
4052
4053 if (id->qp)
4054 ib_detach_mcast(id->qp,
4055 &mc->multicast.ib->rec.mgid,
4056 be16_to_cpu(mc->multicast.ib->rec.mlid));
4057
4058 BUG_ON(id_priv->cma_dev->device != id->device);
4059
4060 if (rdma_cap_ib_mcast(id->device, id->port_num)) {
4061 ib_sa_free_multicast(mc->multicast.ib);
4062 kfree(mc);
4063 } else if (rdma_protocol_roce(id->device, id->port_num)) {
4064 if (mc->igmp_joined) {
4065 struct rdma_dev_addr *dev_addr =
4066 &id->route.addr.dev_addr;
4067 struct net_device *ndev = NULL;
4068
4069 if (dev_addr->bound_dev_if)
4070 ndev = dev_get_by_index(&init_net,
4071 dev_addr->bound_dev_if);
4072 if (ndev) {
4073 cma_igmp_send(ndev,
4074 &mc->multicast.ib->rec.mgid,
4075 false);
4076 dev_put(ndev);
4077 }
4078 mc->igmp_joined = false;
4079 }
4080 kref_put(&mc->mcref, release_mc);
4081 }
4082 return;
4083 }
4084 }
4085 spin_unlock_irq(&id_priv->lock);
4086 }
4087 EXPORT_SYMBOL(rdma_leave_multicast);
4088
4089 static int cma_netdev_change(struct net_device *ndev, struct rdma_id_private *id_priv)
4090 {
4091 struct rdma_dev_addr *dev_addr;
4092 struct cma_ndev_work *work;
4093
4094 dev_addr = &id_priv->id.route.addr.dev_addr;
4095
4096 if ((dev_addr->bound_dev_if == ndev->ifindex) &&
4097 (net_eq(dev_net(ndev), dev_addr->net)) &&
4098 memcmp(dev_addr->src_dev_addr, ndev->dev_addr, ndev->addr_len)) {
4099 pr_info("RDMA CM addr change for ndev %s used by id %p\n",
4100 ndev->name, &id_priv->id);
4101 work = kzalloc(sizeof *work, GFP_KERNEL);
4102 if (!work)
4103 return -ENOMEM;
4104
4105 INIT_WORK(&work->work, cma_ndev_work_handler);
4106 work->id = id_priv;
4107 work->event.event = RDMA_CM_EVENT_ADDR_CHANGE;
4108 atomic_inc(&id_priv->refcount);
4109 queue_work(cma_wq, &work->work);
4110 }
4111
4112 return 0;
4113 }
4114
4115 static int cma_netdev_callback(struct notifier_block *self, unsigned long event,
4116 void *ptr)
4117 {
4118 struct net_device *ndev = netdev_notifier_info_to_dev(ptr);
4119 struct cma_device *cma_dev;
4120 struct rdma_id_private *id_priv;
4121 int ret = NOTIFY_DONE;
4122
4123 if (event != NETDEV_BONDING_FAILOVER)
4124 return NOTIFY_DONE;
4125
4126 if (!(ndev->flags & IFF_MASTER) || !(ndev->priv_flags & IFF_BONDING))
4127 return NOTIFY_DONE;
4128
4129 mutex_lock(&lock);
4130 list_for_each_entry(cma_dev, &dev_list, list)
4131 list_for_each_entry(id_priv, &cma_dev->id_list, list) {
4132 ret = cma_netdev_change(ndev, id_priv);
4133 if (ret)
4134 goto out;
4135 }
4136
4137 out:
4138 mutex_unlock(&lock);
4139 return ret;
4140 }
4141
4142 static struct notifier_block cma_nb = {
4143 .notifier_call = cma_netdev_callback
4144 };
4145
4146 static void cma_add_one(struct ib_device *device)
4147 {
4148 struct cma_device *cma_dev;
4149 struct rdma_id_private *id_priv;
4150 unsigned int i;
4151 unsigned long supported_gids = 0;
4152
4153 cma_dev = kmalloc(sizeof *cma_dev, GFP_KERNEL);
4154 if (!cma_dev)
4155 return;
4156
4157 cma_dev->device = device;
4158 cma_dev->default_gid_type = kcalloc(device->phys_port_cnt,
4159 sizeof(*cma_dev->default_gid_type),
4160 GFP_KERNEL);
4161 if (!cma_dev->default_gid_type) {
4162 kfree(cma_dev);
4163 return;
4164 }
4165 for (i = rdma_start_port(device); i <= rdma_end_port(device); i++) {
4166 supported_gids = roce_gid_type_mask_support(device, i);
4167 WARN_ON(!supported_gids);
4168 cma_dev->default_gid_type[i - rdma_start_port(device)] =
4169 find_first_bit(&supported_gids, BITS_PER_LONG);
4170 }
4171
4172 init_completion(&cma_dev->comp);
4173 atomic_set(&cma_dev->refcount, 1);
4174 INIT_LIST_HEAD(&cma_dev->id_list);
4175 ib_set_client_data(device, &cma_client, cma_dev);
4176
4177 mutex_lock(&lock);
4178 list_add_tail(&cma_dev->list, &dev_list);
4179 list_for_each_entry(id_priv, &listen_any_list, list)
4180 cma_listen_on_dev(id_priv, cma_dev);
4181 mutex_unlock(&lock);
4182 }
4183
4184 static int cma_remove_id_dev(struct rdma_id_private *id_priv)
4185 {
4186 struct rdma_cm_event event;
4187 enum rdma_cm_state state;
4188 int ret = 0;
4189
4190 /* Record that we want to remove the device */
4191 state = cma_exch(id_priv, RDMA_CM_DEVICE_REMOVAL);
4192 if (state == RDMA_CM_DESTROYING)
4193 return 0;
4194
4195 cma_cancel_operation(id_priv, state);
4196 mutex_lock(&id_priv->handler_mutex);
4197
4198 /* Check for destruction from another callback. */
4199 if (!cma_comp(id_priv, RDMA_CM_DEVICE_REMOVAL))
4200 goto out;
4201
4202 memset(&event, 0, sizeof event);
4203 event.event = RDMA_CM_EVENT_DEVICE_REMOVAL;
4204 ret = id_priv->id.event_handler(&id_priv->id, &event);
4205 out:
4206 mutex_unlock(&id_priv->handler_mutex);
4207 return ret;
4208 }
4209
4210 static void cma_process_remove(struct cma_device *cma_dev)
4211 {
4212 struct rdma_id_private *id_priv;
4213 int ret;
4214
4215 mutex_lock(&lock);
4216 while (!list_empty(&cma_dev->id_list)) {
4217 id_priv = list_entry(cma_dev->id_list.next,
4218 struct rdma_id_private, list);
4219
4220 list_del(&id_priv->listen_list);
4221 list_del_init(&id_priv->list);
4222 atomic_inc(&id_priv->refcount);
4223 mutex_unlock(&lock);
4224
4225 ret = id_priv->internal_id ? 1 : cma_remove_id_dev(id_priv);
4226 cma_deref_id(id_priv);
4227 if (ret)
4228 rdma_destroy_id(&id_priv->id);
4229
4230 mutex_lock(&lock);
4231 }
4232 mutex_unlock(&lock);
4233
4234 cma_deref_dev(cma_dev);
4235 wait_for_completion(&cma_dev->comp);
4236 }
4237
4238 static void cma_remove_one(struct ib_device *device, void *client_data)
4239 {
4240 struct cma_device *cma_dev = client_data;
4241
4242 if (!cma_dev)
4243 return;
4244
4245 mutex_lock(&lock);
4246 list_del(&cma_dev->list);
4247 mutex_unlock(&lock);
4248
4249 cma_process_remove(cma_dev);
4250 kfree(cma_dev->default_gid_type);
4251 kfree(cma_dev);
4252 }
4253
4254 static int cma_get_id_stats(struct sk_buff *skb, struct netlink_callback *cb)
4255 {
4256 struct nlmsghdr *nlh;
4257 struct rdma_cm_id_stats *id_stats;
4258 struct rdma_id_private *id_priv;
4259 struct rdma_cm_id *id = NULL;
4260 struct cma_device *cma_dev;
4261 int i_dev = 0, i_id = 0;
4262
4263 /*
4264 * We export all of the IDs as a sequence of messages. Each
4265 * ID gets its own netlink message.
4266 */
4267 mutex_lock(&lock);
4268
4269 list_for_each_entry(cma_dev, &dev_list, list) {
4270 if (i_dev < cb->args[0]) {
4271 i_dev++;
4272 continue;
4273 }
4274
4275 i_id = 0;
4276 list_for_each_entry(id_priv, &cma_dev->id_list, list) {
4277 if (i_id < cb->args[1]) {
4278 i_id++;
4279 continue;
4280 }
4281
4282 id_stats = ibnl_put_msg(skb, &nlh, cb->nlh->nlmsg_seq,
4283 sizeof *id_stats, RDMA_NL_RDMA_CM,
4284 RDMA_NL_RDMA_CM_ID_STATS,
4285 NLM_F_MULTI);
4286 if (!id_stats)
4287 goto out;
4288
4289 memset(id_stats, 0, sizeof *id_stats);
4290 id = &id_priv->id;
4291 id_stats->node_type = id->route.addr.dev_addr.dev_type;
4292 id_stats->port_num = id->port_num;
4293 id_stats->bound_dev_if =
4294 id->route.addr.dev_addr.bound_dev_if;
4295
4296 if (ibnl_put_attr(skb, nlh,
4297 rdma_addr_size(cma_src_addr(id_priv)),
4298 cma_src_addr(id_priv),
4299 RDMA_NL_RDMA_CM_ATTR_SRC_ADDR))
4300 goto out;
4301 if (ibnl_put_attr(skb, nlh,
4302 rdma_addr_size(cma_src_addr(id_priv)),
4303 cma_dst_addr(id_priv),
4304 RDMA_NL_RDMA_CM_ATTR_DST_ADDR))
4305 goto out;
4306
4307 id_stats->pid = id_priv->owner;
4308 id_stats->port_space = id->ps;
4309 id_stats->cm_state = id_priv->state;
4310 id_stats->qp_num = id_priv->qp_num;
4311 id_stats->qp_type = id->qp_type;
4312
4313 i_id++;
4314 }
4315
4316 cb->args[1] = 0;
4317 i_dev++;
4318 }
4319
4320 out:
4321 mutex_unlock(&lock);
4322 cb->args[0] = i_dev;
4323 cb->args[1] = i_id;
4324
4325 return skb->len;
4326 }
4327
4328 static const struct ibnl_client_cbs cma_cb_table[] = {
4329 [RDMA_NL_RDMA_CM_ID_STATS] = { .dump = cma_get_id_stats,
4330 .module = THIS_MODULE },
4331 };
4332
4333 static int cma_init_net(struct net *net)
4334 {
4335 struct cma_pernet *pernet = cma_pernet(net);
4336
4337 idr_init(&pernet->tcp_ps);
4338 idr_init(&pernet->udp_ps);
4339 idr_init(&pernet->ipoib_ps);
4340 idr_init(&pernet->ib_ps);
4341
4342 return 0;
4343 }
4344
4345 static void cma_exit_net(struct net *net)
4346 {
4347 struct cma_pernet *pernet = cma_pernet(net);
4348
4349 idr_destroy(&pernet->tcp_ps);
4350 idr_destroy(&pernet->udp_ps);
4351 idr_destroy(&pernet->ipoib_ps);
4352 idr_destroy(&pernet->ib_ps);
4353 }
4354
4355 static struct pernet_operations cma_pernet_operations = {
4356 .init = cma_init_net,
4357 .exit = cma_exit_net,
4358 .id = &cma_pernet_id,
4359 .size = sizeof(struct cma_pernet),
4360 };
4361
4362 static int __init cma_init(void)
4363 {
4364 int ret;
4365
4366 cma_wq = create_singlethread_workqueue("rdma_cm");
4367 if (!cma_wq)
4368 return -ENOMEM;
4369
4370 ret = register_pernet_subsys(&cma_pernet_operations);
4371 if (ret)
4372 goto err_wq;
4373
4374 ib_sa_register_client(&sa_client);
4375 rdma_addr_register_client(&addr_client);
4376 register_netdevice_notifier(&cma_nb);
4377
4378 ret = ib_register_client(&cma_client);
4379 if (ret)
4380 goto err;
4381
4382 if (ibnl_add_client(RDMA_NL_RDMA_CM, ARRAY_SIZE(cma_cb_table),
4383 cma_cb_table))
4384 pr_warn("RDMA CMA: failed to add netlink callback\n");
4385 cma_configfs_init();
4386
4387 return 0;
4388
4389 err:
4390 unregister_netdevice_notifier(&cma_nb);
4391 rdma_addr_unregister_client(&addr_client);
4392 ib_sa_unregister_client(&sa_client);
4393 err_wq:
4394 destroy_workqueue(cma_wq);
4395 return ret;
4396 }
4397
4398 static void __exit cma_cleanup(void)
4399 {
4400 cma_configfs_exit();
4401 ibnl_remove_client(RDMA_NL_RDMA_CM);
4402 ib_unregister_client(&cma_client);
4403 unregister_netdevice_notifier(&cma_nb);
4404 rdma_addr_unregister_client(&addr_client);
4405 ib_sa_unregister_client(&sa_client);
4406 unregister_pernet_subsys(&cma_pernet_operations);
4407 destroy_workqueue(cma_wq);
4408 }
4409
4410 module_init(cma_init);
4411 module_exit(cma_cleanup);
Linux kernel - Deliverables
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