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[mirror_ubuntu-artful-kernel.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 unsigned 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_in *src_addr,
1098 struct sockaddr_in *dst_addr,
1099 struct cma_hdr *hdr,
1100 __be16 local_port)
1101 {
1102 if (src_addr) {
1103 *src_addr = (struct sockaddr_in) {
1104 .sin_family = AF_INET,
1105 .sin_addr.s_addr = hdr->dst_addr.ip4.addr,
1106 .sin_port = local_port,
1107 };
1108 }
1109
1110 if (dst_addr) {
1111 *dst_addr = (struct sockaddr_in) {
1112 .sin_family = AF_INET,
1113 .sin_addr.s_addr = hdr->src_addr.ip4.addr,
1114 .sin_port = hdr->port,
1115 };
1116 }
1117 }
1118
1119 static void cma_save_ip6_info(struct sockaddr_in6 *src_addr,
1120 struct sockaddr_in6 *dst_addr,
1121 struct cma_hdr *hdr,
1122 __be16 local_port)
1123 {
1124 if (src_addr) {
1125 *src_addr = (struct sockaddr_in6) {
1126 .sin6_family = AF_INET6,
1127 .sin6_addr = hdr->dst_addr.ip6,
1128 .sin6_port = local_port,
1129 };
1130 }
1131
1132 if (dst_addr) {
1133 *dst_addr = (struct sockaddr_in6) {
1134 .sin6_family = AF_INET6,
1135 .sin6_addr = hdr->src_addr.ip6,
1136 .sin6_port = hdr->port,
1137 };
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((struct sockaddr_in *)src_addr,
1163 (struct sockaddr_in *)dst_addr, hdr, port);
1164 break;
1165 case 6:
1166 cma_save_ip6_info((struct sockaddr_in6 *)src_addr,
1167 (struct sockaddr_in6 *)dst_addr, hdr, port);
1168 break;
1169 default:
1170 return -EAFNOSUPPORT;
1171 }
1172
1173 return 0;
1174 }
1175
1176 static int cma_save_net_info(struct sockaddr *src_addr,
1177 struct sockaddr *dst_addr,
1178 struct rdma_cm_id *listen_id,
1179 struct ib_cm_event *ib_event,
1180 sa_family_t sa_family, __be64 service_id)
1181 {
1182 if (sa_family == AF_IB) {
1183 if (ib_event->event == IB_CM_REQ_RECEIVED)
1184 cma_save_ib_info(src_addr, dst_addr, listen_id,
1185 ib_event->param.req_rcvd.primary_path);
1186 else if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED)
1187 cma_save_ib_info(src_addr, dst_addr, listen_id, NULL);
1188 return 0;
1189 }
1190
1191 return cma_save_ip_info(src_addr, dst_addr, ib_event, service_id);
1192 }
1193
1194 static int cma_save_req_info(const struct ib_cm_event *ib_event,
1195 struct cma_req_info *req)
1196 {
1197 const struct ib_cm_req_event_param *req_param =
1198 &ib_event->param.req_rcvd;
1199 const struct ib_cm_sidr_req_event_param *sidr_param =
1200 &ib_event->param.sidr_req_rcvd;
1201
1202 switch (ib_event->event) {
1203 case IB_CM_REQ_RECEIVED:
1204 req->device = req_param->listen_id->device;
1205 req->port = req_param->port;
1206 memcpy(&req->local_gid, &req_param->primary_path->sgid,
1207 sizeof(req->local_gid));
1208 req->has_gid = true;
1209 req->service_id = req_param->primary_path->service_id;
1210 req->pkey = be16_to_cpu(req_param->primary_path->pkey);
1211 if (req->pkey != req_param->bth_pkey)
1212 pr_warn_ratelimited("RDMA CMA: got different BTH P_Key (0x%x) and primary path P_Key (0x%x)\n"
1213 "RDMA CMA: in the future this may cause the request to be dropped\n",
1214 req_param->bth_pkey, req->pkey);
1215 break;
1216 case IB_CM_SIDR_REQ_RECEIVED:
1217 req->device = sidr_param->listen_id->device;
1218 req->port = sidr_param->port;
1219 req->has_gid = false;
1220 req->service_id = sidr_param->service_id;
1221 req->pkey = sidr_param->pkey;
1222 if (req->pkey != sidr_param->bth_pkey)
1223 pr_warn_ratelimited("RDMA CMA: got different BTH P_Key (0x%x) and SIDR request payload P_Key (0x%x)\n"
1224 "RDMA CMA: in the future this may cause the request to be dropped\n",
1225 sidr_param->bth_pkey, req->pkey);
1226 break;
1227 default:
1228 return -EINVAL;
1229 }
1230
1231 return 0;
1232 }
1233
1234 static bool validate_ipv4_net_dev(struct net_device *net_dev,
1235 const struct sockaddr_in *dst_addr,
1236 const struct sockaddr_in *src_addr)
1237 {
1238 __be32 daddr = dst_addr->sin_addr.s_addr,
1239 saddr = src_addr->sin_addr.s_addr;
1240 struct fib_result res;
1241 struct flowi4 fl4;
1242 int err;
1243 bool ret;
1244
1245 if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) ||
1246 ipv4_is_lbcast(daddr) || ipv4_is_zeronet(saddr) ||
1247 ipv4_is_zeronet(daddr) || ipv4_is_loopback(daddr) ||
1248 ipv4_is_loopback(saddr))
1249 return false;
1250
1251 memset(&fl4, 0, sizeof(fl4));
1252 fl4.flowi4_iif = net_dev->ifindex;
1253 fl4.daddr = daddr;
1254 fl4.saddr = saddr;
1255
1256 rcu_read_lock();
1257 err = fib_lookup(dev_net(net_dev), &fl4, &res, 0);
1258 ret = err == 0 && FIB_RES_DEV(res) == net_dev;
1259 rcu_read_unlock();
1260
1261 return ret;
1262 }
1263
1264 static bool validate_ipv6_net_dev(struct net_device *net_dev,
1265 const struct sockaddr_in6 *dst_addr,
1266 const struct sockaddr_in6 *src_addr)
1267 {
1268 #if IS_ENABLED(CONFIG_IPV6)
1269 const int strict = ipv6_addr_type(&dst_addr->sin6_addr) &
1270 IPV6_ADDR_LINKLOCAL;
1271 struct rt6_info *rt = rt6_lookup(dev_net(net_dev), &dst_addr->sin6_addr,
1272 &src_addr->sin6_addr, net_dev->ifindex,
1273 strict);
1274 bool ret;
1275
1276 if (!rt)
1277 return false;
1278
1279 ret = rt->rt6i_idev->dev == net_dev;
1280 ip6_rt_put(rt);
1281
1282 return ret;
1283 #else
1284 return false;
1285 #endif
1286 }
1287
1288 static bool validate_net_dev(struct net_device *net_dev,
1289 const struct sockaddr *daddr,
1290 const struct sockaddr *saddr)
1291 {
1292 const struct sockaddr_in *daddr4 = (const struct sockaddr_in *)daddr;
1293 const struct sockaddr_in *saddr4 = (const struct sockaddr_in *)saddr;
1294 const struct sockaddr_in6 *daddr6 = (const struct sockaddr_in6 *)daddr;
1295 const struct sockaddr_in6 *saddr6 = (const struct sockaddr_in6 *)saddr;
1296
1297 switch (daddr->sa_family) {
1298 case AF_INET:
1299 return saddr->sa_family == AF_INET &&
1300 validate_ipv4_net_dev(net_dev, daddr4, saddr4);
1301
1302 case AF_INET6:
1303 return saddr->sa_family == AF_INET6 &&
1304 validate_ipv6_net_dev(net_dev, daddr6, saddr6);
1305
1306 default:
1307 return false;
1308 }
1309 }
1310
1311 static struct net_device *cma_get_net_dev(struct ib_cm_event *ib_event,
1312 const struct cma_req_info *req)
1313 {
1314 struct sockaddr_storage listen_addr_storage, src_addr_storage;
1315 struct sockaddr *listen_addr = (struct sockaddr *)&listen_addr_storage,
1316 *src_addr = (struct sockaddr *)&src_addr_storage;
1317 struct net_device *net_dev;
1318 const union ib_gid *gid = req->has_gid ? &req->local_gid : NULL;
1319 int err;
1320
1321 err = cma_save_ip_info(listen_addr, src_addr, ib_event,
1322 req->service_id);
1323 if (err)
1324 return ERR_PTR(err);
1325
1326 net_dev = ib_get_net_dev_by_params(req->device, req->port, req->pkey,
1327 gid, listen_addr);
1328 if (!net_dev)
1329 return ERR_PTR(-ENODEV);
1330
1331 if (!validate_net_dev(net_dev, listen_addr, src_addr)) {
1332 dev_put(net_dev);
1333 return ERR_PTR(-EHOSTUNREACH);
1334 }
1335
1336 return net_dev;
1337 }
1338
1339 static enum rdma_port_space rdma_ps_from_service_id(__be64 service_id)
1340 {
1341 return (be64_to_cpu(service_id) >> 16) & 0xffff;
1342 }
1343
1344 static bool cma_match_private_data(struct rdma_id_private *id_priv,
1345 const struct cma_hdr *hdr)
1346 {
1347 struct sockaddr *addr = cma_src_addr(id_priv);
1348 __be32 ip4_addr;
1349 struct in6_addr ip6_addr;
1350
1351 if (cma_any_addr(addr) && !id_priv->afonly)
1352 return true;
1353
1354 switch (addr->sa_family) {
1355 case AF_INET:
1356 ip4_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
1357 if (cma_get_ip_ver(hdr) != 4)
1358 return false;
1359 if (!cma_any_addr(addr) &&
1360 hdr->dst_addr.ip4.addr != ip4_addr)
1361 return false;
1362 break;
1363 case AF_INET6:
1364 ip6_addr = ((struct sockaddr_in6 *)addr)->sin6_addr;
1365 if (cma_get_ip_ver(hdr) != 6)
1366 return false;
1367 if (!cma_any_addr(addr) &&
1368 memcmp(&hdr->dst_addr.ip6, &ip6_addr, sizeof(ip6_addr)))
1369 return false;
1370 break;
1371 case AF_IB:
1372 return true;
1373 default:
1374 return false;
1375 }
1376
1377 return true;
1378 }
1379
1380 static bool cma_protocol_roce_dev_port(struct ib_device *device, int port_num)
1381 {
1382 enum rdma_link_layer ll = rdma_port_get_link_layer(device, port_num);
1383 enum rdma_transport_type transport =
1384 rdma_node_get_transport(device->node_type);
1385
1386 return ll == IB_LINK_LAYER_ETHERNET && transport == RDMA_TRANSPORT_IB;
1387 }
1388
1389 static bool cma_protocol_roce(const struct rdma_cm_id *id)
1390 {
1391 struct ib_device *device = id->device;
1392 const int port_num = id->port_num ?: rdma_start_port(device);
1393
1394 return cma_protocol_roce_dev_port(device, port_num);
1395 }
1396
1397 static bool cma_match_net_dev(const struct rdma_cm_id *id,
1398 const struct net_device *net_dev,
1399 u8 port_num)
1400 {
1401 const struct rdma_addr *addr = &id->route.addr;
1402
1403 if (!net_dev)
1404 /* This request is an AF_IB request or a RoCE request */
1405 return (!id->port_num || id->port_num == port_num) &&
1406 (addr->src_addr.ss_family == AF_IB ||
1407 cma_protocol_roce_dev_port(id->device, port_num));
1408
1409 return !addr->dev_addr.bound_dev_if ||
1410 (net_eq(dev_net(net_dev), addr->dev_addr.net) &&
1411 addr->dev_addr.bound_dev_if == net_dev->ifindex);
1412 }
1413
1414 static struct rdma_id_private *cma_find_listener(
1415 const struct rdma_bind_list *bind_list,
1416 const struct ib_cm_id *cm_id,
1417 const struct ib_cm_event *ib_event,
1418 const struct cma_req_info *req,
1419 const struct net_device *net_dev)
1420 {
1421 struct rdma_id_private *id_priv, *id_priv_dev;
1422
1423 if (!bind_list)
1424 return ERR_PTR(-EINVAL);
1425
1426 hlist_for_each_entry(id_priv, &bind_list->owners, node) {
1427 if (cma_match_private_data(id_priv, ib_event->private_data)) {
1428 if (id_priv->id.device == cm_id->device &&
1429 cma_match_net_dev(&id_priv->id, net_dev, req->port))
1430 return id_priv;
1431 list_for_each_entry(id_priv_dev,
1432 &id_priv->listen_list,
1433 listen_list) {
1434 if (id_priv_dev->id.device == cm_id->device &&
1435 cma_match_net_dev(&id_priv_dev->id, net_dev, req->port))
1436 return id_priv_dev;
1437 }
1438 }
1439 }
1440
1441 return ERR_PTR(-EINVAL);
1442 }
1443
1444 static struct rdma_id_private *cma_id_from_event(struct ib_cm_id *cm_id,
1445 struct ib_cm_event *ib_event,
1446 struct net_device **net_dev)
1447 {
1448 struct cma_req_info req;
1449 struct rdma_bind_list *bind_list;
1450 struct rdma_id_private *id_priv;
1451 int err;
1452
1453 err = cma_save_req_info(ib_event, &req);
1454 if (err)
1455 return ERR_PTR(err);
1456
1457 *net_dev = cma_get_net_dev(ib_event, &req);
1458 if (IS_ERR(*net_dev)) {
1459 if (PTR_ERR(*net_dev) == -EAFNOSUPPORT) {
1460 /* Assuming the protocol is AF_IB */
1461 *net_dev = NULL;
1462 } else if (cma_protocol_roce_dev_port(req.device, req.port)) {
1463 /* TODO find the net dev matching the request parameters
1464 * through the RoCE GID table */
1465 *net_dev = NULL;
1466 } else {
1467 return ERR_CAST(*net_dev);
1468 }
1469 }
1470
1471 bind_list = cma_ps_find(*net_dev ? dev_net(*net_dev) : &init_net,
1472 rdma_ps_from_service_id(req.service_id),
1473 cma_port_from_service_id(req.service_id));
1474 id_priv = cma_find_listener(bind_list, cm_id, ib_event, &req, *net_dev);
1475 if (IS_ERR(id_priv) && *net_dev) {
1476 dev_put(*net_dev);
1477 *net_dev = NULL;
1478 }
1479
1480 return id_priv;
1481 }
1482
1483 static inline int cma_user_data_offset(struct rdma_id_private *id_priv)
1484 {
1485 return cma_family(id_priv) == AF_IB ? 0 : sizeof(struct cma_hdr);
1486 }
1487
1488 static void cma_cancel_route(struct rdma_id_private *id_priv)
1489 {
1490 if (rdma_cap_ib_sa(id_priv->id.device, id_priv->id.port_num)) {
1491 if (id_priv->query)
1492 ib_sa_cancel_query(id_priv->query_id, id_priv->query);
1493 }
1494 }
1495
1496 static void cma_cancel_listens(struct rdma_id_private *id_priv)
1497 {
1498 struct rdma_id_private *dev_id_priv;
1499
1500 /*
1501 * Remove from listen_any_list to prevent added devices from spawning
1502 * additional listen requests.
1503 */
1504 mutex_lock(&lock);
1505 list_del(&id_priv->list);
1506
1507 while (!list_empty(&id_priv->listen_list)) {
1508 dev_id_priv = list_entry(id_priv->listen_list.next,
1509 struct rdma_id_private, listen_list);
1510 /* sync with device removal to avoid duplicate destruction */
1511 list_del_init(&dev_id_priv->list);
1512 list_del(&dev_id_priv->listen_list);
1513 mutex_unlock(&lock);
1514
1515 rdma_destroy_id(&dev_id_priv->id);
1516 mutex_lock(&lock);
1517 }
1518 mutex_unlock(&lock);
1519 }
1520
1521 static void cma_cancel_operation(struct rdma_id_private *id_priv,
1522 enum rdma_cm_state state)
1523 {
1524 switch (state) {
1525 case RDMA_CM_ADDR_QUERY:
1526 rdma_addr_cancel(&id_priv->id.route.addr.dev_addr);
1527 break;
1528 case RDMA_CM_ROUTE_QUERY:
1529 cma_cancel_route(id_priv);
1530 break;
1531 case RDMA_CM_LISTEN:
1532 if (cma_any_addr(cma_src_addr(id_priv)) && !id_priv->cma_dev)
1533 cma_cancel_listens(id_priv);
1534 break;
1535 default:
1536 break;
1537 }
1538 }
1539
1540 static void cma_release_port(struct rdma_id_private *id_priv)
1541 {
1542 struct rdma_bind_list *bind_list = id_priv->bind_list;
1543 struct net *net = id_priv->id.route.addr.dev_addr.net;
1544
1545 if (!bind_list)
1546 return;
1547
1548 mutex_lock(&lock);
1549 hlist_del(&id_priv->node);
1550 if (hlist_empty(&bind_list->owners)) {
1551 cma_ps_remove(net, bind_list->ps, bind_list->port);
1552 kfree(bind_list);
1553 }
1554 mutex_unlock(&lock);
1555 }
1556
1557 static void cma_leave_mc_groups(struct rdma_id_private *id_priv)
1558 {
1559 struct cma_multicast *mc;
1560
1561 while (!list_empty(&id_priv->mc_list)) {
1562 mc = container_of(id_priv->mc_list.next,
1563 struct cma_multicast, list);
1564 list_del(&mc->list);
1565 if (rdma_cap_ib_mcast(id_priv->cma_dev->device,
1566 id_priv->id.port_num)) {
1567 ib_sa_free_multicast(mc->multicast.ib);
1568 kfree(mc);
1569 } else {
1570 if (mc->igmp_joined) {
1571 struct rdma_dev_addr *dev_addr =
1572 &id_priv->id.route.addr.dev_addr;
1573 struct net_device *ndev = NULL;
1574
1575 if (dev_addr->bound_dev_if)
1576 ndev = dev_get_by_index(&init_net,
1577 dev_addr->bound_dev_if);
1578 if (ndev) {
1579 cma_igmp_send(ndev,
1580 &mc->multicast.ib->rec.mgid,
1581 false);
1582 dev_put(ndev);
1583 }
1584 }
1585 kref_put(&mc->mcref, release_mc);
1586 }
1587 }
1588 }
1589
1590 void rdma_destroy_id(struct rdma_cm_id *id)
1591 {
1592 struct rdma_id_private *id_priv;
1593 enum rdma_cm_state state;
1594
1595 id_priv = container_of(id, struct rdma_id_private, id);
1596 state = cma_exch(id_priv, RDMA_CM_DESTROYING);
1597 cma_cancel_operation(id_priv, state);
1598
1599 /*
1600 * Wait for any active callback to finish. New callbacks will find
1601 * the id_priv state set to destroying and abort.
1602 */
1603 mutex_lock(&id_priv->handler_mutex);
1604 mutex_unlock(&id_priv->handler_mutex);
1605
1606 if (id_priv->cma_dev) {
1607 if (rdma_cap_ib_cm(id_priv->id.device, 1)) {
1608 if (id_priv->cm_id.ib)
1609 ib_destroy_cm_id(id_priv->cm_id.ib);
1610 } else if (rdma_cap_iw_cm(id_priv->id.device, 1)) {
1611 if (id_priv->cm_id.iw)
1612 iw_destroy_cm_id(id_priv->cm_id.iw);
1613 }
1614 cma_leave_mc_groups(id_priv);
1615 cma_release_dev(id_priv);
1616 }
1617
1618 cma_release_port(id_priv);
1619 cma_deref_id(id_priv);
1620 wait_for_completion(&id_priv->comp);
1621
1622 if (id_priv->internal_id)
1623 cma_deref_id(id_priv->id.context);
1624
1625 kfree(id_priv->id.route.path_rec);
1626 put_net(id_priv->id.route.addr.dev_addr.net);
1627 kfree(id_priv);
1628 }
1629 EXPORT_SYMBOL(rdma_destroy_id);
1630
1631 static int cma_rep_recv(struct rdma_id_private *id_priv)
1632 {
1633 int ret;
1634
1635 ret = cma_modify_qp_rtr(id_priv, NULL);
1636 if (ret)
1637 goto reject;
1638
1639 ret = cma_modify_qp_rts(id_priv, NULL);
1640 if (ret)
1641 goto reject;
1642
1643 ret = ib_send_cm_rtu(id_priv->cm_id.ib, NULL, 0);
1644 if (ret)
1645 goto reject;
1646
1647 return 0;
1648 reject:
1649 cma_modify_qp_err(id_priv);
1650 ib_send_cm_rej(id_priv->cm_id.ib, IB_CM_REJ_CONSUMER_DEFINED,
1651 NULL, 0, NULL, 0);
1652 return ret;
1653 }
1654
1655 static void cma_set_rep_event_data(struct rdma_cm_event *event,
1656 struct ib_cm_rep_event_param *rep_data,
1657 void *private_data)
1658 {
1659 event->param.conn.private_data = private_data;
1660 event->param.conn.private_data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
1661 event->param.conn.responder_resources = rep_data->responder_resources;
1662 event->param.conn.initiator_depth = rep_data->initiator_depth;
1663 event->param.conn.flow_control = rep_data->flow_control;
1664 event->param.conn.rnr_retry_count = rep_data->rnr_retry_count;
1665 event->param.conn.srq = rep_data->srq;
1666 event->param.conn.qp_num = rep_data->remote_qpn;
1667 }
1668
1669 static int cma_ib_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
1670 {
1671 struct rdma_id_private *id_priv = cm_id->context;
1672 struct rdma_cm_event event;
1673 int ret = 0;
1674
1675 mutex_lock(&id_priv->handler_mutex);
1676 if ((ib_event->event != IB_CM_TIMEWAIT_EXIT &&
1677 id_priv->state != RDMA_CM_CONNECT) ||
1678 (ib_event->event == IB_CM_TIMEWAIT_EXIT &&
1679 id_priv->state != RDMA_CM_DISCONNECT))
1680 goto out;
1681
1682 memset(&event, 0, sizeof event);
1683 switch (ib_event->event) {
1684 case IB_CM_REQ_ERROR:
1685 case IB_CM_REP_ERROR:
1686 event.event = RDMA_CM_EVENT_UNREACHABLE;
1687 event.status = -ETIMEDOUT;
1688 break;
1689 case IB_CM_REP_RECEIVED:
1690 if (id_priv->id.qp) {
1691 event.status = cma_rep_recv(id_priv);
1692 event.event = event.status ? RDMA_CM_EVENT_CONNECT_ERROR :
1693 RDMA_CM_EVENT_ESTABLISHED;
1694 } else {
1695 event.event = RDMA_CM_EVENT_CONNECT_RESPONSE;
1696 }
1697 cma_set_rep_event_data(&event, &ib_event->param.rep_rcvd,
1698 ib_event->private_data);
1699 break;
1700 case IB_CM_RTU_RECEIVED:
1701 case IB_CM_USER_ESTABLISHED:
1702 event.event = RDMA_CM_EVENT_ESTABLISHED;
1703 break;
1704 case IB_CM_DREQ_ERROR:
1705 event.status = -ETIMEDOUT; /* fall through */
1706 case IB_CM_DREQ_RECEIVED:
1707 case IB_CM_DREP_RECEIVED:
1708 if (!cma_comp_exch(id_priv, RDMA_CM_CONNECT,
1709 RDMA_CM_DISCONNECT))
1710 goto out;
1711 event.event = RDMA_CM_EVENT_DISCONNECTED;
1712 break;
1713 case IB_CM_TIMEWAIT_EXIT:
1714 event.event = RDMA_CM_EVENT_TIMEWAIT_EXIT;
1715 break;
1716 case IB_CM_MRA_RECEIVED:
1717 /* ignore event */
1718 goto out;
1719 case IB_CM_REJ_RECEIVED:
1720 cma_modify_qp_err(id_priv);
1721 event.status = ib_event->param.rej_rcvd.reason;
1722 event.event = RDMA_CM_EVENT_REJECTED;
1723 event.param.conn.private_data = ib_event->private_data;
1724 event.param.conn.private_data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
1725 break;
1726 default:
1727 pr_err("RDMA CMA: unexpected IB CM event: %d\n",
1728 ib_event->event);
1729 goto out;
1730 }
1731
1732 ret = id_priv->id.event_handler(&id_priv->id, &event);
1733 if (ret) {
1734 /* Destroy the CM ID by returning a non-zero value. */
1735 id_priv->cm_id.ib = NULL;
1736 cma_exch(id_priv, RDMA_CM_DESTROYING);
1737 mutex_unlock(&id_priv->handler_mutex);
1738 rdma_destroy_id(&id_priv->id);
1739 return ret;
1740 }
1741 out:
1742 mutex_unlock(&id_priv->handler_mutex);
1743 return ret;
1744 }
1745
1746 static struct rdma_id_private *cma_new_conn_id(struct rdma_cm_id *listen_id,
1747 struct ib_cm_event *ib_event,
1748 struct net_device *net_dev)
1749 {
1750 struct rdma_id_private *id_priv;
1751 struct rdma_cm_id *id;
1752 struct rdma_route *rt;
1753 const sa_family_t ss_family = listen_id->route.addr.src_addr.ss_family;
1754 const __be64 service_id =
1755 ib_event->param.req_rcvd.primary_path->service_id;
1756 int ret;
1757
1758 id = rdma_create_id(listen_id->route.addr.dev_addr.net,
1759 listen_id->event_handler, listen_id->context,
1760 listen_id->ps, ib_event->param.req_rcvd.qp_type);
1761 if (IS_ERR(id))
1762 return NULL;
1763
1764 id_priv = container_of(id, struct rdma_id_private, id);
1765 if (cma_save_net_info((struct sockaddr *)&id->route.addr.src_addr,
1766 (struct sockaddr *)&id->route.addr.dst_addr,
1767 listen_id, ib_event, ss_family, service_id))
1768 goto err;
1769
1770 rt = &id->route;
1771 rt->num_paths = ib_event->param.req_rcvd.alternate_path ? 2 : 1;
1772 rt->path_rec = kmalloc(sizeof *rt->path_rec * rt->num_paths,
1773 GFP_KERNEL);
1774 if (!rt->path_rec)
1775 goto err;
1776
1777 rt->path_rec[0] = *ib_event->param.req_rcvd.primary_path;
1778 if (rt->num_paths == 2)
1779 rt->path_rec[1] = *ib_event->param.req_rcvd.alternate_path;
1780
1781 if (net_dev) {
1782 ret = rdma_copy_addr(&rt->addr.dev_addr, net_dev, NULL);
1783 if (ret)
1784 goto err;
1785 } else {
1786 if (!cma_protocol_roce(listen_id) &&
1787 cma_any_addr(cma_src_addr(id_priv))) {
1788 rt->addr.dev_addr.dev_type = ARPHRD_INFINIBAND;
1789 rdma_addr_set_sgid(&rt->addr.dev_addr, &rt->path_rec[0].sgid);
1790 ib_addr_set_pkey(&rt->addr.dev_addr, be16_to_cpu(rt->path_rec[0].pkey));
1791 } else if (!cma_any_addr(cma_src_addr(id_priv))) {
1792 ret = cma_translate_addr(cma_src_addr(id_priv), &rt->addr.dev_addr);
1793 if (ret)
1794 goto err;
1795 }
1796 }
1797 rdma_addr_set_dgid(&rt->addr.dev_addr, &rt->path_rec[0].dgid);
1798
1799 id_priv->state = RDMA_CM_CONNECT;
1800 return id_priv;
1801
1802 err:
1803 rdma_destroy_id(id);
1804 return NULL;
1805 }
1806
1807 static struct rdma_id_private *cma_new_udp_id(struct rdma_cm_id *listen_id,
1808 struct ib_cm_event *ib_event,
1809 struct net_device *net_dev)
1810 {
1811 struct rdma_id_private *id_priv;
1812 struct rdma_cm_id *id;
1813 const sa_family_t ss_family = listen_id->route.addr.src_addr.ss_family;
1814 struct net *net = listen_id->route.addr.dev_addr.net;
1815 int ret;
1816
1817 id = rdma_create_id(net, listen_id->event_handler, listen_id->context,
1818 listen_id->ps, IB_QPT_UD);
1819 if (IS_ERR(id))
1820 return NULL;
1821
1822 id_priv = container_of(id, struct rdma_id_private, id);
1823 if (cma_save_net_info((struct sockaddr *)&id->route.addr.src_addr,
1824 (struct sockaddr *)&id->route.addr.dst_addr,
1825 listen_id, ib_event, ss_family,
1826 ib_event->param.sidr_req_rcvd.service_id))
1827 goto err;
1828
1829 if (net_dev) {
1830 ret = rdma_copy_addr(&id->route.addr.dev_addr, net_dev, NULL);
1831 if (ret)
1832 goto err;
1833 } else {
1834 if (!cma_any_addr(cma_src_addr(id_priv))) {
1835 ret = cma_translate_addr(cma_src_addr(id_priv),
1836 &id->route.addr.dev_addr);
1837 if (ret)
1838 goto err;
1839 }
1840 }
1841
1842 id_priv->state = RDMA_CM_CONNECT;
1843 return id_priv;
1844 err:
1845 rdma_destroy_id(id);
1846 return NULL;
1847 }
1848
1849 static void cma_set_req_event_data(struct rdma_cm_event *event,
1850 struct ib_cm_req_event_param *req_data,
1851 void *private_data, int offset)
1852 {
1853 event->param.conn.private_data = private_data + offset;
1854 event->param.conn.private_data_len = IB_CM_REQ_PRIVATE_DATA_SIZE - offset;
1855 event->param.conn.responder_resources = req_data->responder_resources;
1856 event->param.conn.initiator_depth = req_data->initiator_depth;
1857 event->param.conn.flow_control = req_data->flow_control;
1858 event->param.conn.retry_count = req_data->retry_count;
1859 event->param.conn.rnr_retry_count = req_data->rnr_retry_count;
1860 event->param.conn.srq = req_data->srq;
1861 event->param.conn.qp_num = req_data->remote_qpn;
1862 }
1863
1864 static int cma_check_req_qp_type(struct rdma_cm_id *id, struct ib_cm_event *ib_event)
1865 {
1866 return (((ib_event->event == IB_CM_REQ_RECEIVED) &&
1867 (ib_event->param.req_rcvd.qp_type == id->qp_type)) ||
1868 ((ib_event->event == IB_CM_SIDR_REQ_RECEIVED) &&
1869 (id->qp_type == IB_QPT_UD)) ||
1870 (!id->qp_type));
1871 }
1872
1873 static int cma_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
1874 {
1875 struct rdma_id_private *listen_id, *conn_id = NULL;
1876 struct rdma_cm_event event;
1877 struct net_device *net_dev;
1878 int offset, ret;
1879
1880 listen_id = cma_id_from_event(cm_id, ib_event, &net_dev);
1881 if (IS_ERR(listen_id))
1882 return PTR_ERR(listen_id);
1883
1884 if (!cma_check_req_qp_type(&listen_id->id, ib_event)) {
1885 ret = -EINVAL;
1886 goto net_dev_put;
1887 }
1888
1889 mutex_lock(&listen_id->handler_mutex);
1890 if (listen_id->state != RDMA_CM_LISTEN) {
1891 ret = -ECONNABORTED;
1892 goto err1;
1893 }
1894
1895 memset(&event, 0, sizeof event);
1896 offset = cma_user_data_offset(listen_id);
1897 event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
1898 if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED) {
1899 conn_id = cma_new_udp_id(&listen_id->id, ib_event, net_dev);
1900 event.param.ud.private_data = ib_event->private_data + offset;
1901 event.param.ud.private_data_len =
1902 IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE - offset;
1903 } else {
1904 conn_id = cma_new_conn_id(&listen_id->id, ib_event, net_dev);
1905 cma_set_req_event_data(&event, &ib_event->param.req_rcvd,
1906 ib_event->private_data, offset);
1907 }
1908 if (!conn_id) {
1909 ret = -ENOMEM;
1910 goto err1;
1911 }
1912
1913 mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
1914 ret = cma_acquire_dev(conn_id, listen_id);
1915 if (ret)
1916 goto err2;
1917
1918 conn_id->cm_id.ib = cm_id;
1919 cm_id->context = conn_id;
1920 cm_id->cm_handler = cma_ib_handler;
1921
1922 /*
1923 * Protect against the user destroying conn_id from another thread
1924 * until we're done accessing it.
1925 */
1926 atomic_inc(&conn_id->refcount);
1927 ret = conn_id->id.event_handler(&conn_id->id, &event);
1928 if (ret)
1929 goto err3;
1930 /*
1931 * Acquire mutex to prevent user executing rdma_destroy_id()
1932 * while we're accessing the cm_id.
1933 */
1934 mutex_lock(&lock);
1935 if (cma_comp(conn_id, RDMA_CM_CONNECT) &&
1936 (conn_id->id.qp_type != IB_QPT_UD))
1937 ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0);
1938 mutex_unlock(&lock);
1939 mutex_unlock(&conn_id->handler_mutex);
1940 mutex_unlock(&listen_id->handler_mutex);
1941 cma_deref_id(conn_id);
1942 if (net_dev)
1943 dev_put(net_dev);
1944 return 0;
1945
1946 err3:
1947 cma_deref_id(conn_id);
1948 /* Destroy the CM ID by returning a non-zero value. */
1949 conn_id->cm_id.ib = NULL;
1950 err2:
1951 cma_exch(conn_id, RDMA_CM_DESTROYING);
1952 mutex_unlock(&conn_id->handler_mutex);
1953 err1:
1954 mutex_unlock(&listen_id->handler_mutex);
1955 if (conn_id)
1956 rdma_destroy_id(&conn_id->id);
1957
1958 net_dev_put:
1959 if (net_dev)
1960 dev_put(net_dev);
1961
1962 return ret;
1963 }
1964
1965 __be64 rdma_get_service_id(struct rdma_cm_id *id, struct sockaddr *addr)
1966 {
1967 if (addr->sa_family == AF_IB)
1968 return ((struct sockaddr_ib *) addr)->sib_sid;
1969
1970 return cpu_to_be64(((u64)id->ps << 16) + be16_to_cpu(cma_port(addr)));
1971 }
1972 EXPORT_SYMBOL(rdma_get_service_id);
1973
1974 static int cma_iw_handler(struct iw_cm_id *iw_id, struct iw_cm_event *iw_event)
1975 {
1976 struct rdma_id_private *id_priv = iw_id->context;
1977 struct rdma_cm_event event;
1978 int ret = 0;
1979 struct sockaddr *laddr = (struct sockaddr *)&iw_event->local_addr;
1980 struct sockaddr *raddr = (struct sockaddr *)&iw_event->remote_addr;
1981
1982 mutex_lock(&id_priv->handler_mutex);
1983 if (id_priv->state != RDMA_CM_CONNECT)
1984 goto out;
1985
1986 memset(&event, 0, sizeof event);
1987 switch (iw_event->event) {
1988 case IW_CM_EVENT_CLOSE:
1989 event.event = RDMA_CM_EVENT_DISCONNECTED;
1990 break;
1991 case IW_CM_EVENT_CONNECT_REPLY:
1992 memcpy(cma_src_addr(id_priv), laddr,
1993 rdma_addr_size(laddr));
1994 memcpy(cma_dst_addr(id_priv), raddr,
1995 rdma_addr_size(raddr));
1996 switch (iw_event->status) {
1997 case 0:
1998 event.event = RDMA_CM_EVENT_ESTABLISHED;
1999 event.param.conn.initiator_depth = iw_event->ird;
2000 event.param.conn.responder_resources = iw_event->ord;
2001 break;
2002 case -ECONNRESET:
2003 case -ECONNREFUSED:
2004 event.event = RDMA_CM_EVENT_REJECTED;
2005 break;
2006 case -ETIMEDOUT:
2007 event.event = RDMA_CM_EVENT_UNREACHABLE;
2008 break;
2009 default:
2010 event.event = RDMA_CM_EVENT_CONNECT_ERROR;
2011 break;
2012 }
2013 break;
2014 case IW_CM_EVENT_ESTABLISHED:
2015 event.event = RDMA_CM_EVENT_ESTABLISHED;
2016 event.param.conn.initiator_depth = iw_event->ird;
2017 event.param.conn.responder_resources = iw_event->ord;
2018 break;
2019 default:
2020 BUG_ON(1);
2021 }
2022
2023 event.status = iw_event->status;
2024 event.param.conn.private_data = iw_event->private_data;
2025 event.param.conn.private_data_len = iw_event->private_data_len;
2026 ret = id_priv->id.event_handler(&id_priv->id, &event);
2027 if (ret) {
2028 /* Destroy the CM ID by returning a non-zero value. */
2029 id_priv->cm_id.iw = NULL;
2030 cma_exch(id_priv, RDMA_CM_DESTROYING);
2031 mutex_unlock(&id_priv->handler_mutex);
2032 rdma_destroy_id(&id_priv->id);
2033 return ret;
2034 }
2035
2036 out:
2037 mutex_unlock(&id_priv->handler_mutex);
2038 return ret;
2039 }
2040
2041 static int iw_conn_req_handler(struct iw_cm_id *cm_id,
2042 struct iw_cm_event *iw_event)
2043 {
2044 struct rdma_cm_id *new_cm_id;
2045 struct rdma_id_private *listen_id, *conn_id;
2046 struct rdma_cm_event event;
2047 int ret = -ECONNABORTED;
2048 struct sockaddr *laddr = (struct sockaddr *)&iw_event->local_addr;
2049 struct sockaddr *raddr = (struct sockaddr *)&iw_event->remote_addr;
2050
2051 listen_id = cm_id->context;
2052
2053 mutex_lock(&listen_id->handler_mutex);
2054 if (listen_id->state != RDMA_CM_LISTEN)
2055 goto out;
2056
2057 /* Create a new RDMA id for the new IW CM ID */
2058 new_cm_id = rdma_create_id(listen_id->id.route.addr.dev_addr.net,
2059 listen_id->id.event_handler,
2060 listen_id->id.context,
2061 RDMA_PS_TCP, IB_QPT_RC);
2062 if (IS_ERR(new_cm_id)) {
2063 ret = -ENOMEM;
2064 goto out;
2065 }
2066 conn_id = container_of(new_cm_id, struct rdma_id_private, id);
2067 mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
2068 conn_id->state = RDMA_CM_CONNECT;
2069
2070 ret = rdma_translate_ip(laddr, &conn_id->id.route.addr.dev_addr, NULL);
2071 if (ret) {
2072 mutex_unlock(&conn_id->handler_mutex);
2073 rdma_destroy_id(new_cm_id);
2074 goto out;
2075 }
2076
2077 ret = cma_acquire_dev(conn_id, listen_id);
2078 if (ret) {
2079 mutex_unlock(&conn_id->handler_mutex);
2080 rdma_destroy_id(new_cm_id);
2081 goto out;
2082 }
2083
2084 conn_id->cm_id.iw = cm_id;
2085 cm_id->context = conn_id;
2086 cm_id->cm_handler = cma_iw_handler;
2087
2088 memcpy(cma_src_addr(conn_id), laddr, rdma_addr_size(laddr));
2089 memcpy(cma_dst_addr(conn_id), raddr, rdma_addr_size(raddr));
2090
2091 memset(&event, 0, sizeof event);
2092 event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
2093 event.param.conn.private_data = iw_event->private_data;
2094 event.param.conn.private_data_len = iw_event->private_data_len;
2095 event.param.conn.initiator_depth = iw_event->ird;
2096 event.param.conn.responder_resources = iw_event->ord;
2097
2098 /*
2099 * Protect against the user destroying conn_id from another thread
2100 * until we're done accessing it.
2101 */
2102 atomic_inc(&conn_id->refcount);
2103 ret = conn_id->id.event_handler(&conn_id->id, &event);
2104 if (ret) {
2105 /* User wants to destroy the CM ID */
2106 conn_id->cm_id.iw = NULL;
2107 cma_exch(conn_id, RDMA_CM_DESTROYING);
2108 mutex_unlock(&conn_id->handler_mutex);
2109 cma_deref_id(conn_id);
2110 rdma_destroy_id(&conn_id->id);
2111 goto out;
2112 }
2113
2114 mutex_unlock(&conn_id->handler_mutex);
2115 cma_deref_id(conn_id);
2116
2117 out:
2118 mutex_unlock(&listen_id->handler_mutex);
2119 return ret;
2120 }
2121
2122 static int cma_ib_listen(struct rdma_id_private *id_priv)
2123 {
2124 struct sockaddr *addr;
2125 struct ib_cm_id *id;
2126 __be64 svc_id;
2127
2128 addr = cma_src_addr(id_priv);
2129 svc_id = rdma_get_service_id(&id_priv->id, addr);
2130 id = ib_cm_insert_listen(id_priv->id.device, cma_req_handler, svc_id);
2131 if (IS_ERR(id))
2132 return PTR_ERR(id);
2133 id_priv->cm_id.ib = id;
2134
2135 return 0;
2136 }
2137
2138 static int cma_iw_listen(struct rdma_id_private *id_priv, int backlog)
2139 {
2140 int ret;
2141 struct iw_cm_id *id;
2142
2143 id = iw_create_cm_id(id_priv->id.device,
2144 iw_conn_req_handler,
2145 id_priv);
2146 if (IS_ERR(id))
2147 return PTR_ERR(id);
2148
2149 id->tos = id_priv->tos;
2150 id_priv->cm_id.iw = id;
2151
2152 memcpy(&id_priv->cm_id.iw->local_addr, cma_src_addr(id_priv),
2153 rdma_addr_size(cma_src_addr(id_priv)));
2154
2155 ret = iw_cm_listen(id_priv->cm_id.iw, backlog);
2156
2157 if (ret) {
2158 iw_destroy_cm_id(id_priv->cm_id.iw);
2159 id_priv->cm_id.iw = NULL;
2160 }
2161
2162 return ret;
2163 }
2164
2165 static int cma_listen_handler(struct rdma_cm_id *id,
2166 struct rdma_cm_event *event)
2167 {
2168 struct rdma_id_private *id_priv = id->context;
2169
2170 id->context = id_priv->id.context;
2171 id->event_handler = id_priv->id.event_handler;
2172 return id_priv->id.event_handler(id, event);
2173 }
2174
2175 static void cma_listen_on_dev(struct rdma_id_private *id_priv,
2176 struct cma_device *cma_dev)
2177 {
2178 struct rdma_id_private *dev_id_priv;
2179 struct rdma_cm_id *id;
2180 struct net *net = id_priv->id.route.addr.dev_addr.net;
2181 int ret;
2182
2183 if (cma_family(id_priv) == AF_IB && !rdma_cap_ib_cm(cma_dev->device, 1))
2184 return;
2185
2186 id = rdma_create_id(net, cma_listen_handler, id_priv, id_priv->id.ps,
2187 id_priv->id.qp_type);
2188 if (IS_ERR(id))
2189 return;
2190
2191 dev_id_priv = container_of(id, struct rdma_id_private, id);
2192
2193 dev_id_priv->state = RDMA_CM_ADDR_BOUND;
2194 memcpy(cma_src_addr(dev_id_priv), cma_src_addr(id_priv),
2195 rdma_addr_size(cma_src_addr(id_priv)));
2196
2197 _cma_attach_to_dev(dev_id_priv, cma_dev);
2198 list_add_tail(&dev_id_priv->listen_list, &id_priv->listen_list);
2199 atomic_inc(&id_priv->refcount);
2200 dev_id_priv->internal_id = 1;
2201 dev_id_priv->afonly = id_priv->afonly;
2202
2203 ret = rdma_listen(id, id_priv->backlog);
2204 if (ret)
2205 pr_warn("RDMA CMA: cma_listen_on_dev, error %d, listening on device %s\n",
2206 ret, cma_dev->device->name);
2207 }
2208
2209 static void cma_listen_on_all(struct rdma_id_private *id_priv)
2210 {
2211 struct cma_device *cma_dev;
2212
2213 mutex_lock(&lock);
2214 list_add_tail(&id_priv->list, &listen_any_list);
2215 list_for_each_entry(cma_dev, &dev_list, list)
2216 cma_listen_on_dev(id_priv, cma_dev);
2217 mutex_unlock(&lock);
2218 }
2219
2220 void rdma_set_service_type(struct rdma_cm_id *id, int tos)
2221 {
2222 struct rdma_id_private *id_priv;
2223
2224 id_priv = container_of(id, struct rdma_id_private, id);
2225 id_priv->tos = (u8) tos;
2226 }
2227 EXPORT_SYMBOL(rdma_set_service_type);
2228
2229 static void cma_query_handler(int status, struct ib_sa_path_rec *path_rec,
2230 void *context)
2231 {
2232 struct cma_work *work = context;
2233 struct rdma_route *route;
2234
2235 route = &work->id->id.route;
2236
2237 if (!status) {
2238 route->num_paths = 1;
2239 *route->path_rec = *path_rec;
2240 } else {
2241 work->old_state = RDMA_CM_ROUTE_QUERY;
2242 work->new_state = RDMA_CM_ADDR_RESOLVED;
2243 work->event.event = RDMA_CM_EVENT_ROUTE_ERROR;
2244 work->event.status = status;
2245 }
2246
2247 queue_work(cma_wq, &work->work);
2248 }
2249
2250 static int cma_query_ib_route(struct rdma_id_private *id_priv, int timeout_ms,
2251 struct cma_work *work)
2252 {
2253 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
2254 struct ib_sa_path_rec path_rec;
2255 ib_sa_comp_mask comp_mask;
2256 struct sockaddr_in6 *sin6;
2257 struct sockaddr_ib *sib;
2258
2259 memset(&path_rec, 0, sizeof path_rec);
2260 rdma_addr_get_sgid(dev_addr, &path_rec.sgid);
2261 rdma_addr_get_dgid(dev_addr, &path_rec.dgid);
2262 path_rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
2263 path_rec.numb_path = 1;
2264 path_rec.reversible = 1;
2265 path_rec.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
2266
2267 comp_mask = IB_SA_PATH_REC_DGID | IB_SA_PATH_REC_SGID |
2268 IB_SA_PATH_REC_PKEY | IB_SA_PATH_REC_NUMB_PATH |
2269 IB_SA_PATH_REC_REVERSIBLE | IB_SA_PATH_REC_SERVICE_ID;
2270
2271 switch (cma_family(id_priv)) {
2272 case AF_INET:
2273 path_rec.qos_class = cpu_to_be16((u16) id_priv->tos);
2274 comp_mask |= IB_SA_PATH_REC_QOS_CLASS;
2275 break;
2276 case AF_INET6:
2277 sin6 = (struct sockaddr_in6 *) cma_src_addr(id_priv);
2278 path_rec.traffic_class = (u8) (be32_to_cpu(sin6->sin6_flowinfo) >> 20);
2279 comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
2280 break;
2281 case AF_IB:
2282 sib = (struct sockaddr_ib *) cma_src_addr(id_priv);
2283 path_rec.traffic_class = (u8) (be32_to_cpu(sib->sib_flowinfo) >> 20);
2284 comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
2285 break;
2286 }
2287
2288 id_priv->query_id = ib_sa_path_rec_get(&sa_client, id_priv->id.device,
2289 id_priv->id.port_num, &path_rec,
2290 comp_mask, timeout_ms,
2291 GFP_KERNEL, cma_query_handler,
2292 work, &id_priv->query);
2293
2294 return (id_priv->query_id < 0) ? id_priv->query_id : 0;
2295 }
2296
2297 static void cma_work_handler(struct work_struct *_work)
2298 {
2299 struct cma_work *work = container_of(_work, struct cma_work, work);
2300 struct rdma_id_private *id_priv = work->id;
2301 int destroy = 0;
2302
2303 mutex_lock(&id_priv->handler_mutex);
2304 if (!cma_comp_exch(id_priv, work->old_state, work->new_state))
2305 goto out;
2306
2307 if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
2308 cma_exch(id_priv, RDMA_CM_DESTROYING);
2309 destroy = 1;
2310 }
2311 out:
2312 mutex_unlock(&id_priv->handler_mutex);
2313 cma_deref_id(id_priv);
2314 if (destroy)
2315 rdma_destroy_id(&id_priv->id);
2316 kfree(work);
2317 }
2318
2319 static void cma_ndev_work_handler(struct work_struct *_work)
2320 {
2321 struct cma_ndev_work *work = container_of(_work, struct cma_ndev_work, work);
2322 struct rdma_id_private *id_priv = work->id;
2323 int destroy = 0;
2324
2325 mutex_lock(&id_priv->handler_mutex);
2326 if (id_priv->state == RDMA_CM_DESTROYING ||
2327 id_priv->state == RDMA_CM_DEVICE_REMOVAL)
2328 goto out;
2329
2330 if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
2331 cma_exch(id_priv, RDMA_CM_DESTROYING);
2332 destroy = 1;
2333 }
2334
2335 out:
2336 mutex_unlock(&id_priv->handler_mutex);
2337 cma_deref_id(id_priv);
2338 if (destroy)
2339 rdma_destroy_id(&id_priv->id);
2340 kfree(work);
2341 }
2342
2343 static int cma_resolve_ib_route(struct rdma_id_private *id_priv, int timeout_ms)
2344 {
2345 struct rdma_route *route = &id_priv->id.route;
2346 struct cma_work *work;
2347 int ret;
2348
2349 work = kzalloc(sizeof *work, GFP_KERNEL);
2350 if (!work)
2351 return -ENOMEM;
2352
2353 work->id = id_priv;
2354 INIT_WORK(&work->work, cma_work_handler);
2355 work->old_state = RDMA_CM_ROUTE_QUERY;
2356 work->new_state = RDMA_CM_ROUTE_RESOLVED;
2357 work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
2358
2359 route->path_rec = kmalloc(sizeof *route->path_rec, GFP_KERNEL);
2360 if (!route->path_rec) {
2361 ret = -ENOMEM;
2362 goto err1;
2363 }
2364
2365 ret = cma_query_ib_route(id_priv, timeout_ms, work);
2366 if (ret)
2367 goto err2;
2368
2369 return 0;
2370 err2:
2371 kfree(route->path_rec);
2372 route->path_rec = NULL;
2373 err1:
2374 kfree(work);
2375 return ret;
2376 }
2377
2378 int rdma_set_ib_paths(struct rdma_cm_id *id,
2379 struct ib_sa_path_rec *path_rec, int num_paths)
2380 {
2381 struct rdma_id_private *id_priv;
2382 int ret;
2383
2384 id_priv = container_of(id, struct rdma_id_private, id);
2385 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED,
2386 RDMA_CM_ROUTE_RESOLVED))
2387 return -EINVAL;
2388
2389 id->route.path_rec = kmemdup(path_rec, sizeof *path_rec * num_paths,
2390 GFP_KERNEL);
2391 if (!id->route.path_rec) {
2392 ret = -ENOMEM;
2393 goto err;
2394 }
2395
2396 id->route.num_paths = num_paths;
2397 return 0;
2398 err:
2399 cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_ADDR_RESOLVED);
2400 return ret;
2401 }
2402 EXPORT_SYMBOL(rdma_set_ib_paths);
2403
2404 static int cma_resolve_iw_route(struct rdma_id_private *id_priv, int timeout_ms)
2405 {
2406 struct cma_work *work;
2407
2408 work = kzalloc(sizeof *work, GFP_KERNEL);
2409 if (!work)
2410 return -ENOMEM;
2411
2412 work->id = id_priv;
2413 INIT_WORK(&work->work, cma_work_handler);
2414 work->old_state = RDMA_CM_ROUTE_QUERY;
2415 work->new_state = RDMA_CM_ROUTE_RESOLVED;
2416 work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
2417 queue_work(cma_wq, &work->work);
2418 return 0;
2419 }
2420
2421 static int iboe_tos_to_sl(struct net_device *ndev, int tos)
2422 {
2423 int prio;
2424 struct net_device *dev;
2425
2426 prio = rt_tos2priority(tos);
2427 dev = ndev->priv_flags & IFF_802_1Q_VLAN ?
2428 vlan_dev_real_dev(ndev) : ndev;
2429
2430 if (dev->num_tc)
2431 return netdev_get_prio_tc_map(dev, prio);
2432
2433 #if IS_ENABLED(CONFIG_VLAN_8021Q)
2434 if (ndev->priv_flags & IFF_802_1Q_VLAN)
2435 return (vlan_dev_get_egress_qos_mask(ndev, prio) &
2436 VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
2437 #endif
2438 return 0;
2439 }
2440
2441 static enum ib_gid_type cma_route_gid_type(enum rdma_network_type network_type,
2442 unsigned long supported_gids,
2443 enum ib_gid_type default_gid)
2444 {
2445 if ((network_type == RDMA_NETWORK_IPV4 ||
2446 network_type == RDMA_NETWORK_IPV6) &&
2447 test_bit(IB_GID_TYPE_ROCE_UDP_ENCAP, &supported_gids))
2448 return IB_GID_TYPE_ROCE_UDP_ENCAP;
2449
2450 return default_gid;
2451 }
2452
2453 static int cma_resolve_iboe_route(struct rdma_id_private *id_priv)
2454 {
2455 struct rdma_route *route = &id_priv->id.route;
2456 struct rdma_addr *addr = &route->addr;
2457 struct cma_work *work;
2458 int ret;
2459 struct net_device *ndev = NULL;
2460
2461
2462 work = kzalloc(sizeof *work, GFP_KERNEL);
2463 if (!work)
2464 return -ENOMEM;
2465
2466 work->id = id_priv;
2467 INIT_WORK(&work->work, cma_work_handler);
2468
2469 route->path_rec = kzalloc(sizeof *route->path_rec, GFP_KERNEL);
2470 if (!route->path_rec) {
2471 ret = -ENOMEM;
2472 goto err1;
2473 }
2474
2475 route->num_paths = 1;
2476
2477 if (addr->dev_addr.bound_dev_if) {
2478 unsigned long supported_gids;
2479
2480 ndev = dev_get_by_index(&init_net, addr->dev_addr.bound_dev_if);
2481 if (!ndev) {
2482 ret = -ENODEV;
2483 goto err2;
2484 }
2485
2486 if (ndev->flags & IFF_LOOPBACK) {
2487 dev_put(ndev);
2488 if (!id_priv->id.device->get_netdev) {
2489 ret = -EOPNOTSUPP;
2490 goto err2;
2491 }
2492
2493 ndev = id_priv->id.device->get_netdev(id_priv->id.device,
2494 id_priv->id.port_num);
2495 if (!ndev) {
2496 ret = -ENODEV;
2497 goto err2;
2498 }
2499 }
2500
2501 route->path_rec->net = &init_net;
2502 route->path_rec->ifindex = ndev->ifindex;
2503 supported_gids = roce_gid_type_mask_support(id_priv->id.device,
2504 id_priv->id.port_num);
2505 route->path_rec->gid_type =
2506 cma_route_gid_type(addr->dev_addr.network,
2507 supported_gids,
2508 id_priv->gid_type);
2509 }
2510 if (!ndev) {
2511 ret = -ENODEV;
2512 goto err2;
2513 }
2514
2515 memcpy(route->path_rec->dmac, addr->dev_addr.dst_dev_addr, ETH_ALEN);
2516
2517 rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
2518 &route->path_rec->sgid);
2519 rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.dst_addr,
2520 &route->path_rec->dgid);
2521
2522 /* Use the hint from IP Stack to select GID Type */
2523 if (route->path_rec->gid_type < ib_network_to_gid_type(addr->dev_addr.network))
2524 route->path_rec->gid_type = ib_network_to_gid_type(addr->dev_addr.network);
2525 if (((struct sockaddr *)&id_priv->id.route.addr.dst_addr)->sa_family != AF_IB)
2526 /* TODO: get the hoplimit from the inet/inet6 device */
2527 route->path_rec->hop_limit = addr->dev_addr.hoplimit;
2528 else
2529 route->path_rec->hop_limit = 1;
2530 route->path_rec->reversible = 1;
2531 route->path_rec->pkey = cpu_to_be16(0xffff);
2532 route->path_rec->mtu_selector = IB_SA_EQ;
2533 route->path_rec->sl = iboe_tos_to_sl(ndev, id_priv->tos);
2534 route->path_rec->mtu = iboe_get_mtu(ndev->mtu);
2535 route->path_rec->rate_selector = IB_SA_EQ;
2536 route->path_rec->rate = iboe_get_rate(ndev);
2537 dev_put(ndev);
2538 route->path_rec->packet_life_time_selector = IB_SA_EQ;
2539 route->path_rec->packet_life_time = CMA_IBOE_PACKET_LIFETIME;
2540 if (!route->path_rec->mtu) {
2541 ret = -EINVAL;
2542 goto err2;
2543 }
2544
2545 work->old_state = RDMA_CM_ROUTE_QUERY;
2546 work->new_state = RDMA_CM_ROUTE_RESOLVED;
2547 work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
2548 work->event.status = 0;
2549
2550 queue_work(cma_wq, &work->work);
2551
2552 return 0;
2553
2554 err2:
2555 kfree(route->path_rec);
2556 route->path_rec = NULL;
2557 err1:
2558 kfree(work);
2559 return ret;
2560 }
2561
2562 int rdma_resolve_route(struct rdma_cm_id *id, int timeout_ms)
2563 {
2564 struct rdma_id_private *id_priv;
2565 int ret;
2566
2567 id_priv = container_of(id, struct rdma_id_private, id);
2568 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED, RDMA_CM_ROUTE_QUERY))
2569 return -EINVAL;
2570
2571 atomic_inc(&id_priv->refcount);
2572 if (rdma_cap_ib_sa(id->device, id->port_num))
2573 ret = cma_resolve_ib_route(id_priv, timeout_ms);
2574 else if (rdma_protocol_roce(id->device, id->port_num))
2575 ret = cma_resolve_iboe_route(id_priv);
2576 else if (rdma_protocol_iwarp(id->device, id->port_num))
2577 ret = cma_resolve_iw_route(id_priv, timeout_ms);
2578 else
2579 ret = -ENOSYS;
2580
2581 if (ret)
2582 goto err;
2583
2584 return 0;
2585 err:
2586 cma_comp_exch(id_priv, RDMA_CM_ROUTE_QUERY, RDMA_CM_ADDR_RESOLVED);
2587 cma_deref_id(id_priv);
2588 return ret;
2589 }
2590 EXPORT_SYMBOL(rdma_resolve_route);
2591
2592 static void cma_set_loopback(struct sockaddr *addr)
2593 {
2594 switch (addr->sa_family) {
2595 case AF_INET:
2596 ((struct sockaddr_in *) addr)->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
2597 break;
2598 case AF_INET6:
2599 ipv6_addr_set(&((struct sockaddr_in6 *) addr)->sin6_addr,
2600 0, 0, 0, htonl(1));
2601 break;
2602 default:
2603 ib_addr_set(&((struct sockaddr_ib *) addr)->sib_addr,
2604 0, 0, 0, htonl(1));
2605 break;
2606 }
2607 }
2608
2609 static int cma_bind_loopback(struct rdma_id_private *id_priv)
2610 {
2611 struct cma_device *cma_dev, *cur_dev;
2612 struct ib_port_attr port_attr;
2613 union ib_gid gid;
2614 u16 pkey;
2615 int ret;
2616 u8 p;
2617
2618 cma_dev = NULL;
2619 mutex_lock(&lock);
2620 list_for_each_entry(cur_dev, &dev_list, list) {
2621 if (cma_family(id_priv) == AF_IB &&
2622 !rdma_cap_ib_cm(cur_dev->device, 1))
2623 continue;
2624
2625 if (!cma_dev)
2626 cma_dev = cur_dev;
2627
2628 for (p = 1; p <= cur_dev->device->phys_port_cnt; ++p) {
2629 if (!ib_query_port(cur_dev->device, p, &port_attr) &&
2630 port_attr.state == IB_PORT_ACTIVE) {
2631 cma_dev = cur_dev;
2632 goto port_found;
2633 }
2634 }
2635 }
2636
2637 if (!cma_dev) {
2638 ret = -ENODEV;
2639 goto out;
2640 }
2641
2642 p = 1;
2643
2644 port_found:
2645 ret = ib_get_cached_gid(cma_dev->device, p, 0, &gid, NULL);
2646 if (ret)
2647 goto out;
2648
2649 ret = ib_get_cached_pkey(cma_dev->device, p, 0, &pkey);
2650 if (ret)
2651 goto out;
2652
2653 id_priv->id.route.addr.dev_addr.dev_type =
2654 (rdma_protocol_ib(cma_dev->device, p)) ?
2655 ARPHRD_INFINIBAND : ARPHRD_ETHER;
2656
2657 rdma_addr_set_sgid(&id_priv->id.route.addr.dev_addr, &gid);
2658 ib_addr_set_pkey(&id_priv->id.route.addr.dev_addr, pkey);
2659 id_priv->id.port_num = p;
2660 cma_attach_to_dev(id_priv, cma_dev);
2661 cma_set_loopback(cma_src_addr(id_priv));
2662 out:
2663 mutex_unlock(&lock);
2664 return ret;
2665 }
2666
2667 static void addr_handler(int status, struct sockaddr *src_addr,
2668 struct rdma_dev_addr *dev_addr, void *context)
2669 {
2670 struct rdma_id_private *id_priv = context;
2671 struct rdma_cm_event event;
2672
2673 memset(&event, 0, sizeof event);
2674 mutex_lock(&id_priv->handler_mutex);
2675 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY,
2676 RDMA_CM_ADDR_RESOLVED))
2677 goto out;
2678
2679 memcpy(cma_src_addr(id_priv), src_addr, rdma_addr_size(src_addr));
2680 if (!status && !id_priv->cma_dev)
2681 status = cma_acquire_dev(id_priv, NULL);
2682
2683 if (status) {
2684 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED,
2685 RDMA_CM_ADDR_BOUND))
2686 goto out;
2687 event.event = RDMA_CM_EVENT_ADDR_ERROR;
2688 event.status = status;
2689 } else
2690 event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
2691
2692 if (id_priv->id.event_handler(&id_priv->id, &event)) {
2693 cma_exch(id_priv, RDMA_CM_DESTROYING);
2694 mutex_unlock(&id_priv->handler_mutex);
2695 cma_deref_id(id_priv);
2696 rdma_destroy_id(&id_priv->id);
2697 return;
2698 }
2699 out:
2700 mutex_unlock(&id_priv->handler_mutex);
2701 cma_deref_id(id_priv);
2702 }
2703
2704 static int cma_resolve_loopback(struct rdma_id_private *id_priv)
2705 {
2706 struct cma_work *work;
2707 union ib_gid gid;
2708 int ret;
2709
2710 work = kzalloc(sizeof *work, GFP_KERNEL);
2711 if (!work)
2712 return -ENOMEM;
2713
2714 if (!id_priv->cma_dev) {
2715 ret = cma_bind_loopback(id_priv);
2716 if (ret)
2717 goto err;
2718 }
2719
2720 rdma_addr_get_sgid(&id_priv->id.route.addr.dev_addr, &gid);
2721 rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, &gid);
2722
2723 work->id = id_priv;
2724 INIT_WORK(&work->work, cma_work_handler);
2725 work->old_state = RDMA_CM_ADDR_QUERY;
2726 work->new_state = RDMA_CM_ADDR_RESOLVED;
2727 work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
2728 queue_work(cma_wq, &work->work);
2729 return 0;
2730 err:
2731 kfree(work);
2732 return ret;
2733 }
2734
2735 static int cma_resolve_ib_addr(struct rdma_id_private *id_priv)
2736 {
2737 struct cma_work *work;
2738 int ret;
2739
2740 work = kzalloc(sizeof *work, GFP_KERNEL);
2741 if (!work)
2742 return -ENOMEM;
2743
2744 if (!id_priv->cma_dev) {
2745 ret = cma_resolve_ib_dev(id_priv);
2746 if (ret)
2747 goto err;
2748 }
2749
2750 rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, (union ib_gid *)
2751 &(((struct sockaddr_ib *) &id_priv->id.route.addr.dst_addr)->sib_addr));
2752
2753 work->id = id_priv;
2754 INIT_WORK(&work->work, cma_work_handler);
2755 work->old_state = RDMA_CM_ADDR_QUERY;
2756 work->new_state = RDMA_CM_ADDR_RESOLVED;
2757 work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
2758 queue_work(cma_wq, &work->work);
2759 return 0;
2760 err:
2761 kfree(work);
2762 return ret;
2763 }
2764
2765 static int cma_bind_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
2766 struct sockaddr *dst_addr)
2767 {
2768 if (!src_addr || !src_addr->sa_family) {
2769 src_addr = (struct sockaddr *) &id->route.addr.src_addr;
2770 src_addr->sa_family = dst_addr->sa_family;
2771 if (dst_addr->sa_family == AF_INET6) {
2772 struct sockaddr_in6 *src_addr6 = (struct sockaddr_in6 *) src_addr;
2773 struct sockaddr_in6 *dst_addr6 = (struct sockaddr_in6 *) dst_addr;
2774 src_addr6->sin6_scope_id = dst_addr6->sin6_scope_id;
2775 if (ipv6_addr_type(&dst_addr6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
2776 id->route.addr.dev_addr.bound_dev_if = dst_addr6->sin6_scope_id;
2777 } else if (dst_addr->sa_family == AF_IB) {
2778 ((struct sockaddr_ib *) src_addr)->sib_pkey =
2779 ((struct sockaddr_ib *) dst_addr)->sib_pkey;
2780 }
2781 }
2782 return rdma_bind_addr(id, src_addr);
2783 }
2784
2785 int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
2786 struct sockaddr *dst_addr, int timeout_ms)
2787 {
2788 struct rdma_id_private *id_priv;
2789 int ret;
2790
2791 id_priv = container_of(id, struct rdma_id_private, id);
2792 if (id_priv->state == RDMA_CM_IDLE) {
2793 ret = cma_bind_addr(id, src_addr, dst_addr);
2794 if (ret)
2795 return ret;
2796 }
2797
2798 if (cma_family(id_priv) != dst_addr->sa_family)
2799 return -EINVAL;
2800
2801 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_ADDR_QUERY))
2802 return -EINVAL;
2803
2804 atomic_inc(&id_priv->refcount);
2805 memcpy(cma_dst_addr(id_priv), dst_addr, rdma_addr_size(dst_addr));
2806 if (cma_any_addr(dst_addr)) {
2807 ret = cma_resolve_loopback(id_priv);
2808 } else {
2809 if (dst_addr->sa_family == AF_IB) {
2810 ret = cma_resolve_ib_addr(id_priv);
2811 } else {
2812 ret = rdma_resolve_ip(&addr_client, cma_src_addr(id_priv),
2813 dst_addr, &id->route.addr.dev_addr,
2814 timeout_ms, addr_handler, id_priv);
2815 }
2816 }
2817 if (ret)
2818 goto err;
2819
2820 return 0;
2821 err:
2822 cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY, RDMA_CM_ADDR_BOUND);
2823 cma_deref_id(id_priv);
2824 return ret;
2825 }
2826 EXPORT_SYMBOL(rdma_resolve_addr);
2827
2828 int rdma_set_reuseaddr(struct rdma_cm_id *id, int reuse)
2829 {
2830 struct rdma_id_private *id_priv;
2831 unsigned long flags;
2832 int ret;
2833
2834 id_priv = container_of(id, struct rdma_id_private, id);
2835 spin_lock_irqsave(&id_priv->lock, flags);
2836 if (reuse || id_priv->state == RDMA_CM_IDLE) {
2837 id_priv->reuseaddr = reuse;
2838 ret = 0;
2839 } else {
2840 ret = -EINVAL;
2841 }
2842 spin_unlock_irqrestore(&id_priv->lock, flags);
2843 return ret;
2844 }
2845 EXPORT_SYMBOL(rdma_set_reuseaddr);
2846
2847 int rdma_set_afonly(struct rdma_cm_id *id, int afonly)
2848 {
2849 struct rdma_id_private *id_priv;
2850 unsigned long flags;
2851 int ret;
2852
2853 id_priv = container_of(id, struct rdma_id_private, id);
2854 spin_lock_irqsave(&id_priv->lock, flags);
2855 if (id_priv->state == RDMA_CM_IDLE || id_priv->state == RDMA_CM_ADDR_BOUND) {
2856 id_priv->options |= (1 << CMA_OPTION_AFONLY);
2857 id_priv->afonly = afonly;
2858 ret = 0;
2859 } else {
2860 ret = -EINVAL;
2861 }
2862 spin_unlock_irqrestore(&id_priv->lock, flags);
2863 return ret;
2864 }
2865 EXPORT_SYMBOL(rdma_set_afonly);
2866
2867 static void cma_bind_port(struct rdma_bind_list *bind_list,
2868 struct rdma_id_private *id_priv)
2869 {
2870 struct sockaddr *addr;
2871 struct sockaddr_ib *sib;
2872 u64 sid, mask;
2873 __be16 port;
2874
2875 addr = cma_src_addr(id_priv);
2876 port = htons(bind_list->port);
2877
2878 switch (addr->sa_family) {
2879 case AF_INET:
2880 ((struct sockaddr_in *) addr)->sin_port = port;
2881 break;
2882 case AF_INET6:
2883 ((struct sockaddr_in6 *) addr)->sin6_port = port;
2884 break;
2885 case AF_IB:
2886 sib = (struct sockaddr_ib *) addr;
2887 sid = be64_to_cpu(sib->sib_sid);
2888 mask = be64_to_cpu(sib->sib_sid_mask);
2889 sib->sib_sid = cpu_to_be64((sid & mask) | (u64) ntohs(port));
2890 sib->sib_sid_mask = cpu_to_be64(~0ULL);
2891 break;
2892 }
2893 id_priv->bind_list = bind_list;
2894 hlist_add_head(&id_priv->node, &bind_list->owners);
2895 }
2896
2897 static int cma_alloc_port(enum rdma_port_space ps,
2898 struct rdma_id_private *id_priv, unsigned short snum)
2899 {
2900 struct rdma_bind_list *bind_list;
2901 int ret;
2902
2903 bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL);
2904 if (!bind_list)
2905 return -ENOMEM;
2906
2907 ret = cma_ps_alloc(id_priv->id.route.addr.dev_addr.net, ps, bind_list,
2908 snum);
2909 if (ret < 0)
2910 goto err;
2911
2912 bind_list->ps = ps;
2913 bind_list->port = (unsigned short)ret;
2914 cma_bind_port(bind_list, id_priv);
2915 return 0;
2916 err:
2917 kfree(bind_list);
2918 return ret == -ENOSPC ? -EADDRNOTAVAIL : ret;
2919 }
2920
2921 static int cma_alloc_any_port(enum rdma_port_space ps,
2922 struct rdma_id_private *id_priv)
2923 {
2924 static unsigned int last_used_port;
2925 int low, high, remaining;
2926 unsigned int rover;
2927 struct net *net = id_priv->id.route.addr.dev_addr.net;
2928
2929 inet_get_local_port_range(net, &low, &high);
2930 remaining = (high - low) + 1;
2931 rover = prandom_u32() % remaining + low;
2932 retry:
2933 if (last_used_port != rover &&
2934 !cma_ps_find(net, ps, (unsigned short)rover)) {
2935 int ret = cma_alloc_port(ps, id_priv, rover);
2936 /*
2937 * Remember previously used port number in order to avoid
2938 * re-using same port immediately after it is closed.
2939 */
2940 if (!ret)
2941 last_used_port = rover;
2942 if (ret != -EADDRNOTAVAIL)
2943 return ret;
2944 }
2945 if (--remaining) {
2946 rover++;
2947 if ((rover < low) || (rover > high))
2948 rover = low;
2949 goto retry;
2950 }
2951 return -EADDRNOTAVAIL;
2952 }
2953
2954 /*
2955 * Check that the requested port is available. This is called when trying to
2956 * bind to a specific port, or when trying to listen on a bound port. In
2957 * the latter case, the provided id_priv may already be on the bind_list, but
2958 * we still need to check that it's okay to start listening.
2959 */
2960 static int cma_check_port(struct rdma_bind_list *bind_list,
2961 struct rdma_id_private *id_priv, uint8_t reuseaddr)
2962 {
2963 struct rdma_id_private *cur_id;
2964 struct sockaddr *addr, *cur_addr;
2965
2966 addr = cma_src_addr(id_priv);
2967 hlist_for_each_entry(cur_id, &bind_list->owners, node) {
2968 if (id_priv == cur_id)
2969 continue;
2970
2971 if ((cur_id->state != RDMA_CM_LISTEN) && reuseaddr &&
2972 cur_id->reuseaddr)
2973 continue;
2974
2975 cur_addr = cma_src_addr(cur_id);
2976 if (id_priv->afonly && cur_id->afonly &&
2977 (addr->sa_family != cur_addr->sa_family))
2978 continue;
2979
2980 if (cma_any_addr(addr) || cma_any_addr(cur_addr))
2981 return -EADDRNOTAVAIL;
2982
2983 if (!cma_addr_cmp(addr, cur_addr))
2984 return -EADDRINUSE;
2985 }
2986 return 0;
2987 }
2988
2989 static int cma_use_port(enum rdma_port_space ps,
2990 struct rdma_id_private *id_priv)
2991 {
2992 struct rdma_bind_list *bind_list;
2993 unsigned short snum;
2994 int ret;
2995
2996 snum = ntohs(cma_port(cma_src_addr(id_priv)));
2997 if (snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
2998 return -EACCES;
2999
3000 bind_list = cma_ps_find(id_priv->id.route.addr.dev_addr.net, ps, snum);
3001 if (!bind_list) {
3002 ret = cma_alloc_port(ps, id_priv, snum);
3003 } else {
3004 ret = cma_check_port(bind_list, id_priv, id_priv->reuseaddr);
3005 if (!ret)
3006 cma_bind_port(bind_list, id_priv);
3007 }
3008 return ret;
3009 }
3010
3011 static int cma_bind_listen(struct rdma_id_private *id_priv)
3012 {
3013 struct rdma_bind_list *bind_list = id_priv->bind_list;
3014 int ret = 0;
3015
3016 mutex_lock(&lock);
3017 if (bind_list->owners.first->next)
3018 ret = cma_check_port(bind_list, id_priv, 0);
3019 mutex_unlock(&lock);
3020 return ret;
3021 }
3022
3023 static enum rdma_port_space cma_select_inet_ps(
3024 struct rdma_id_private *id_priv)
3025 {
3026 switch (id_priv->id.ps) {
3027 case RDMA_PS_TCP:
3028 case RDMA_PS_UDP:
3029 case RDMA_PS_IPOIB:
3030 case RDMA_PS_IB:
3031 return id_priv->id.ps;
3032 default:
3033
3034 return 0;
3035 }
3036 }
3037
3038 static enum rdma_port_space cma_select_ib_ps(struct rdma_id_private *id_priv)
3039 {
3040 enum rdma_port_space ps = 0;
3041 struct sockaddr_ib *sib;
3042 u64 sid_ps, mask, sid;
3043
3044 sib = (struct sockaddr_ib *) cma_src_addr(id_priv);
3045 mask = be64_to_cpu(sib->sib_sid_mask) & RDMA_IB_IP_PS_MASK;
3046 sid = be64_to_cpu(sib->sib_sid) & mask;
3047
3048 if ((id_priv->id.ps == RDMA_PS_IB) && (sid == (RDMA_IB_IP_PS_IB & mask))) {
3049 sid_ps = RDMA_IB_IP_PS_IB;
3050 ps = RDMA_PS_IB;
3051 } else if (((id_priv->id.ps == RDMA_PS_IB) || (id_priv->id.ps == RDMA_PS_TCP)) &&
3052 (sid == (RDMA_IB_IP_PS_TCP & mask))) {
3053 sid_ps = RDMA_IB_IP_PS_TCP;
3054 ps = RDMA_PS_TCP;
3055 } else if (((id_priv->id.ps == RDMA_PS_IB) || (id_priv->id.ps == RDMA_PS_UDP)) &&
3056 (sid == (RDMA_IB_IP_PS_UDP & mask))) {
3057 sid_ps = RDMA_IB_IP_PS_UDP;
3058 ps = RDMA_PS_UDP;
3059 }
3060
3061 if (ps) {
3062 sib->sib_sid = cpu_to_be64(sid_ps | ntohs(cma_port((struct sockaddr *) sib)));
3063 sib->sib_sid_mask = cpu_to_be64(RDMA_IB_IP_PS_MASK |
3064 be64_to_cpu(sib->sib_sid_mask));
3065 }
3066 return ps;
3067 }
3068
3069 static int cma_get_port(struct rdma_id_private *id_priv)
3070 {
3071 enum rdma_port_space ps;
3072 int ret;
3073
3074 if (cma_family(id_priv) != AF_IB)
3075 ps = cma_select_inet_ps(id_priv);
3076 else
3077 ps = cma_select_ib_ps(id_priv);
3078 if (!ps)
3079 return -EPROTONOSUPPORT;
3080
3081 mutex_lock(&lock);
3082 if (cma_any_port(cma_src_addr(id_priv)))
3083 ret = cma_alloc_any_port(ps, id_priv);
3084 else
3085 ret = cma_use_port(ps, id_priv);
3086 mutex_unlock(&lock);
3087
3088 return ret;
3089 }
3090
3091 static int cma_check_linklocal(struct rdma_dev_addr *dev_addr,
3092 struct sockaddr *addr)
3093 {
3094 #if IS_ENABLED(CONFIG_IPV6)
3095 struct sockaddr_in6 *sin6;
3096
3097 if (addr->sa_family != AF_INET6)
3098 return 0;
3099
3100 sin6 = (struct sockaddr_in6 *) addr;
3101
3102 if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
3103 return 0;
3104
3105 if (!sin6->sin6_scope_id)
3106 return -EINVAL;
3107
3108 dev_addr->bound_dev_if = sin6->sin6_scope_id;
3109 #endif
3110 return 0;
3111 }
3112
3113 int rdma_listen(struct rdma_cm_id *id, int backlog)
3114 {
3115 struct rdma_id_private *id_priv;
3116 int ret;
3117
3118 id_priv = container_of(id, struct rdma_id_private, id);
3119 if (id_priv->state == RDMA_CM_IDLE) {
3120 id->route.addr.src_addr.ss_family = AF_INET;
3121 ret = rdma_bind_addr(id, cma_src_addr(id_priv));
3122 if (ret)
3123 return ret;
3124 }
3125
3126 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_LISTEN))
3127 return -EINVAL;
3128
3129 if (id_priv->reuseaddr) {
3130 ret = cma_bind_listen(id_priv);
3131 if (ret)
3132 goto err;
3133 }
3134
3135 id_priv->backlog = backlog;
3136 if (id->device) {
3137 if (rdma_cap_ib_cm(id->device, 1)) {
3138 ret = cma_ib_listen(id_priv);
3139 if (ret)
3140 goto err;
3141 } else if (rdma_cap_iw_cm(id->device, 1)) {
3142 ret = cma_iw_listen(id_priv, backlog);
3143 if (ret)
3144 goto err;
3145 } else {
3146 ret = -ENOSYS;
3147 goto err;
3148 }
3149 } else
3150 cma_listen_on_all(id_priv);
3151
3152 return 0;
3153 err:
3154 id_priv->backlog = 0;
3155 cma_comp_exch(id_priv, RDMA_CM_LISTEN, RDMA_CM_ADDR_BOUND);
3156 return ret;
3157 }
3158 EXPORT_SYMBOL(rdma_listen);
3159
3160 int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr)
3161 {
3162 struct rdma_id_private *id_priv;
3163 int ret;
3164
3165 if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6 &&
3166 addr->sa_family != AF_IB)
3167 return -EAFNOSUPPORT;
3168
3169 id_priv = container_of(id, struct rdma_id_private, id);
3170 if (!cma_comp_exch(id_priv, RDMA_CM_IDLE, RDMA_CM_ADDR_BOUND))
3171 return -EINVAL;
3172
3173 ret = cma_check_linklocal(&id->route.addr.dev_addr, addr);
3174 if (ret)
3175 goto err1;
3176
3177 memcpy(cma_src_addr(id_priv), addr, rdma_addr_size(addr));
3178 if (!cma_any_addr(addr)) {
3179 ret = cma_translate_addr(addr, &id->route.addr.dev_addr);
3180 if (ret)
3181 goto err1;
3182
3183 ret = cma_acquire_dev(id_priv, NULL);
3184 if (ret)
3185 goto err1;
3186 }
3187
3188 if (!(id_priv->options & (1 << CMA_OPTION_AFONLY))) {
3189 if (addr->sa_family == AF_INET)
3190 id_priv->afonly = 1;
3191 #if IS_ENABLED(CONFIG_IPV6)
3192 else if (addr->sa_family == AF_INET6) {
3193 struct net *net = id_priv->id.route.addr.dev_addr.net;
3194
3195 id_priv->afonly = net->ipv6.sysctl.bindv6only;
3196 }
3197 #endif
3198 }
3199 ret = cma_get_port(id_priv);
3200 if (ret)
3201 goto err2;
3202
3203 return 0;
3204 err2:
3205 if (id_priv->cma_dev)
3206 cma_release_dev(id_priv);
3207 err1:
3208 cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_IDLE);
3209 return ret;
3210 }
3211 EXPORT_SYMBOL(rdma_bind_addr);
3212
3213 static int cma_format_hdr(void *hdr, struct rdma_id_private *id_priv)
3214 {
3215 struct cma_hdr *cma_hdr;
3216
3217 cma_hdr = hdr;
3218 cma_hdr->cma_version = CMA_VERSION;
3219 if (cma_family(id_priv) == AF_INET) {
3220 struct sockaddr_in *src4, *dst4;
3221
3222 src4 = (struct sockaddr_in *) cma_src_addr(id_priv);
3223 dst4 = (struct sockaddr_in *) cma_dst_addr(id_priv);
3224
3225 cma_set_ip_ver(cma_hdr, 4);
3226 cma_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
3227 cma_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
3228 cma_hdr->port = src4->sin_port;
3229 } else if (cma_family(id_priv) == AF_INET6) {
3230 struct sockaddr_in6 *src6, *dst6;
3231
3232 src6 = (struct sockaddr_in6 *) cma_src_addr(id_priv);
3233 dst6 = (struct sockaddr_in6 *) cma_dst_addr(id_priv);
3234
3235 cma_set_ip_ver(cma_hdr, 6);
3236 cma_hdr->src_addr.ip6 = src6->sin6_addr;
3237 cma_hdr->dst_addr.ip6 = dst6->sin6_addr;
3238 cma_hdr->port = src6->sin6_port;
3239 }
3240 return 0;
3241 }
3242
3243 static int cma_sidr_rep_handler(struct ib_cm_id *cm_id,
3244 struct ib_cm_event *ib_event)
3245 {
3246 struct rdma_id_private *id_priv = cm_id->context;
3247 struct rdma_cm_event event;
3248 struct ib_cm_sidr_rep_event_param *rep = &ib_event->param.sidr_rep_rcvd;
3249 int ret = 0;
3250
3251 mutex_lock(&id_priv->handler_mutex);
3252 if (id_priv->state != RDMA_CM_CONNECT)
3253 goto out;
3254
3255 memset(&event, 0, sizeof event);
3256 switch (ib_event->event) {
3257 case IB_CM_SIDR_REQ_ERROR:
3258 event.event = RDMA_CM_EVENT_UNREACHABLE;
3259 event.status = -ETIMEDOUT;
3260 break;
3261 case IB_CM_SIDR_REP_RECEIVED:
3262 event.param.ud.private_data = ib_event->private_data;
3263 event.param.ud.private_data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
3264 if (rep->status != IB_SIDR_SUCCESS) {
3265 event.event = RDMA_CM_EVENT_UNREACHABLE;
3266 event.status = ib_event->param.sidr_rep_rcvd.status;
3267 break;
3268 }
3269 ret = cma_set_qkey(id_priv, rep->qkey);
3270 if (ret) {
3271 event.event = RDMA_CM_EVENT_ADDR_ERROR;
3272 event.status = ret;
3273 break;
3274 }
3275 ib_init_ah_from_path(id_priv->id.device, id_priv->id.port_num,
3276 id_priv->id.route.path_rec,
3277 &event.param.ud.ah_attr);
3278 event.param.ud.qp_num = rep->qpn;
3279 event.param.ud.qkey = rep->qkey;
3280 event.event = RDMA_CM_EVENT_ESTABLISHED;
3281 event.status = 0;
3282 break;
3283 default:
3284 pr_err("RDMA CMA: unexpected IB CM event: %d\n",
3285 ib_event->event);
3286 goto out;
3287 }
3288
3289 ret = id_priv->id.event_handler(&id_priv->id, &event);
3290 if (ret) {
3291 /* Destroy the CM ID by returning a non-zero value. */
3292 id_priv->cm_id.ib = NULL;
3293 cma_exch(id_priv, RDMA_CM_DESTROYING);
3294 mutex_unlock(&id_priv->handler_mutex);
3295 rdma_destroy_id(&id_priv->id);
3296 return ret;
3297 }
3298 out:
3299 mutex_unlock(&id_priv->handler_mutex);
3300 return ret;
3301 }
3302
3303 static int cma_resolve_ib_udp(struct rdma_id_private *id_priv,
3304 struct rdma_conn_param *conn_param)
3305 {
3306 struct ib_cm_sidr_req_param req;
3307 struct ib_cm_id *id;
3308 void *private_data;
3309 int offset, ret;
3310
3311 memset(&req, 0, sizeof req);
3312 offset = cma_user_data_offset(id_priv);
3313 req.private_data_len = offset + conn_param->private_data_len;
3314 if (req.private_data_len < conn_param->private_data_len)
3315 return -EINVAL;
3316
3317 if (req.private_data_len) {
3318 private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
3319 if (!private_data)
3320 return -ENOMEM;
3321 } else {
3322 private_data = NULL;
3323 }
3324
3325 if (conn_param->private_data && conn_param->private_data_len)
3326 memcpy(private_data + offset, conn_param->private_data,
3327 conn_param->private_data_len);
3328
3329 if (private_data) {
3330 ret = cma_format_hdr(private_data, id_priv);
3331 if (ret)
3332 goto out;
3333 req.private_data = private_data;
3334 }
3335
3336 id = ib_create_cm_id(id_priv->id.device, cma_sidr_rep_handler,
3337 id_priv);
3338 if (IS_ERR(id)) {
3339 ret = PTR_ERR(id);
3340 goto out;
3341 }
3342 id_priv->cm_id.ib = id;
3343
3344 req.path = id_priv->id.route.path_rec;
3345 req.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
3346 req.timeout_ms = 1 << (CMA_CM_RESPONSE_TIMEOUT - 8);
3347 req.max_cm_retries = CMA_MAX_CM_RETRIES;
3348
3349 ret = ib_send_cm_sidr_req(id_priv->cm_id.ib, &req);
3350 if (ret) {
3351 ib_destroy_cm_id(id_priv->cm_id.ib);
3352 id_priv->cm_id.ib = NULL;
3353 }
3354 out:
3355 kfree(private_data);
3356 return ret;
3357 }
3358
3359 static int cma_connect_ib(struct rdma_id_private *id_priv,
3360 struct rdma_conn_param *conn_param)
3361 {
3362 struct ib_cm_req_param req;
3363 struct rdma_route *route;
3364 void *private_data;
3365 struct ib_cm_id *id;
3366 int offset, ret;
3367
3368 memset(&req, 0, sizeof req);
3369 offset = cma_user_data_offset(id_priv);
3370 req.private_data_len = offset + conn_param->private_data_len;
3371 if (req.private_data_len < conn_param->private_data_len)
3372 return -EINVAL;
3373
3374 if (req.private_data_len) {
3375 private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
3376 if (!private_data)
3377 return -ENOMEM;
3378 } else {
3379 private_data = NULL;
3380 }
3381
3382 if (conn_param->private_data && conn_param->private_data_len)
3383 memcpy(private_data + offset, conn_param->private_data,
3384 conn_param->private_data_len);
3385
3386 id = ib_create_cm_id(id_priv->id.device, cma_ib_handler, id_priv);
3387 if (IS_ERR(id)) {
3388 ret = PTR_ERR(id);
3389 goto out;
3390 }
3391 id_priv->cm_id.ib = id;
3392
3393 route = &id_priv->id.route;
3394 if (private_data) {
3395 ret = cma_format_hdr(private_data, id_priv);
3396 if (ret)
3397 goto out;
3398 req.private_data = private_data;
3399 }
3400
3401 req.primary_path = &route->path_rec[0];
3402 if (route->num_paths == 2)
3403 req.alternate_path = &route->path_rec[1];
3404
3405 req.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
3406 req.qp_num = id_priv->qp_num;
3407 req.qp_type = id_priv->id.qp_type;
3408 req.starting_psn = id_priv->seq_num;
3409 req.responder_resources = conn_param->responder_resources;
3410 req.initiator_depth = conn_param->initiator_depth;
3411 req.flow_control = conn_param->flow_control;
3412 req.retry_count = min_t(u8, 7, conn_param->retry_count);
3413 req.rnr_retry_count = min_t(u8, 7, conn_param->rnr_retry_count);
3414 req.remote_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
3415 req.local_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
3416 req.max_cm_retries = CMA_MAX_CM_RETRIES;
3417 req.srq = id_priv->srq ? 1 : 0;
3418
3419 ret = ib_send_cm_req(id_priv->cm_id.ib, &req);
3420 out:
3421 if (ret && !IS_ERR(id)) {
3422 ib_destroy_cm_id(id);
3423 id_priv->cm_id.ib = NULL;
3424 }
3425
3426 kfree(private_data);
3427 return ret;
3428 }
3429
3430 static int cma_connect_iw(struct rdma_id_private *id_priv,
3431 struct rdma_conn_param *conn_param)
3432 {
3433 struct iw_cm_id *cm_id;
3434 int ret;
3435 struct iw_cm_conn_param iw_param;
3436
3437 cm_id = iw_create_cm_id(id_priv->id.device, cma_iw_handler, id_priv);
3438 if (IS_ERR(cm_id))
3439 return PTR_ERR(cm_id);
3440
3441 cm_id->tos = id_priv->tos;
3442 id_priv->cm_id.iw = cm_id;
3443
3444 memcpy(&cm_id->local_addr, cma_src_addr(id_priv),
3445 rdma_addr_size(cma_src_addr(id_priv)));
3446 memcpy(&cm_id->remote_addr, cma_dst_addr(id_priv),
3447 rdma_addr_size(cma_dst_addr(id_priv)));
3448
3449 ret = cma_modify_qp_rtr(id_priv, conn_param);
3450 if (ret)
3451 goto out;
3452
3453 if (conn_param) {
3454 iw_param.ord = conn_param->initiator_depth;
3455 iw_param.ird = conn_param->responder_resources;
3456 iw_param.private_data = conn_param->private_data;
3457 iw_param.private_data_len = conn_param->private_data_len;
3458 iw_param.qpn = id_priv->id.qp ? id_priv->qp_num : conn_param->qp_num;
3459 } else {
3460 memset(&iw_param, 0, sizeof iw_param);
3461 iw_param.qpn = id_priv->qp_num;
3462 }
3463 ret = iw_cm_connect(cm_id, &iw_param);
3464 out:
3465 if (ret) {
3466 iw_destroy_cm_id(cm_id);
3467 id_priv->cm_id.iw = NULL;
3468 }
3469 return ret;
3470 }
3471
3472 int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
3473 {
3474 struct rdma_id_private *id_priv;
3475 int ret;
3476
3477 id_priv = container_of(id, struct rdma_id_private, id);
3478 if (!cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_CONNECT))
3479 return -EINVAL;
3480
3481 if (!id->qp) {
3482 id_priv->qp_num = conn_param->qp_num;
3483 id_priv->srq = conn_param->srq;
3484 }
3485
3486 if (rdma_cap_ib_cm(id->device, id->port_num)) {
3487 if (id->qp_type == IB_QPT_UD)
3488 ret = cma_resolve_ib_udp(id_priv, conn_param);
3489 else
3490 ret = cma_connect_ib(id_priv, conn_param);
3491 } else if (rdma_cap_iw_cm(id->device, id->port_num))
3492 ret = cma_connect_iw(id_priv, conn_param);
3493 else
3494 ret = -ENOSYS;
3495 if (ret)
3496 goto err;
3497
3498 return 0;
3499 err:
3500 cma_comp_exch(id_priv, RDMA_CM_CONNECT, RDMA_CM_ROUTE_RESOLVED);
3501 return ret;
3502 }
3503 EXPORT_SYMBOL(rdma_connect);
3504
3505 static int cma_accept_ib(struct rdma_id_private *id_priv,
3506 struct rdma_conn_param *conn_param)
3507 {
3508 struct ib_cm_rep_param rep;
3509 int ret;
3510
3511 ret = cma_modify_qp_rtr(id_priv, conn_param);
3512 if (ret)
3513 goto out;
3514
3515 ret = cma_modify_qp_rts(id_priv, conn_param);
3516 if (ret)
3517 goto out;
3518
3519 memset(&rep, 0, sizeof rep);
3520 rep.qp_num = id_priv->qp_num;
3521 rep.starting_psn = id_priv->seq_num;
3522 rep.private_data = conn_param->private_data;
3523 rep.private_data_len = conn_param->private_data_len;
3524 rep.responder_resources = conn_param->responder_resources;
3525 rep.initiator_depth = conn_param->initiator_depth;
3526 rep.failover_accepted = 0;
3527 rep.flow_control = conn_param->flow_control;
3528 rep.rnr_retry_count = min_t(u8, 7, conn_param->rnr_retry_count);
3529 rep.srq = id_priv->srq ? 1 : 0;
3530
3531 ret = ib_send_cm_rep(id_priv->cm_id.ib, &rep);
3532 out:
3533 return ret;
3534 }
3535
3536 static int cma_accept_iw(struct rdma_id_private *id_priv,
3537 struct rdma_conn_param *conn_param)
3538 {
3539 struct iw_cm_conn_param iw_param;
3540 int ret;
3541
3542 ret = cma_modify_qp_rtr(id_priv, conn_param);
3543 if (ret)
3544 return ret;
3545
3546 iw_param.ord = conn_param->initiator_depth;
3547 iw_param.ird = conn_param->responder_resources;
3548 iw_param.private_data = conn_param->private_data;
3549 iw_param.private_data_len = conn_param->private_data_len;
3550 if (id_priv->id.qp) {
3551 iw_param.qpn = id_priv->qp_num;
3552 } else
3553 iw_param.qpn = conn_param->qp_num;
3554
3555 return iw_cm_accept(id_priv->cm_id.iw, &iw_param);
3556 }
3557
3558 static int cma_send_sidr_rep(struct rdma_id_private *id_priv,
3559 enum ib_cm_sidr_status status, u32 qkey,
3560 const void *private_data, int private_data_len)
3561 {
3562 struct ib_cm_sidr_rep_param rep;
3563 int ret;
3564
3565 memset(&rep, 0, sizeof rep);
3566 rep.status = status;
3567 if (status == IB_SIDR_SUCCESS) {
3568 ret = cma_set_qkey(id_priv, qkey);
3569 if (ret)
3570 return ret;
3571 rep.qp_num = id_priv->qp_num;
3572 rep.qkey = id_priv->qkey;
3573 }
3574 rep.private_data = private_data;
3575 rep.private_data_len = private_data_len;
3576
3577 return ib_send_cm_sidr_rep(id_priv->cm_id.ib, &rep);
3578 }
3579
3580 int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
3581 {
3582 struct rdma_id_private *id_priv;
3583 int ret;
3584
3585 id_priv = container_of(id, struct rdma_id_private, id);
3586
3587 id_priv->owner = task_pid_nr(current);
3588
3589 if (!cma_comp(id_priv, RDMA_CM_CONNECT))
3590 return -EINVAL;
3591
3592 if (!id->qp && conn_param) {
3593 id_priv->qp_num = conn_param->qp_num;
3594 id_priv->srq = conn_param->srq;
3595 }
3596
3597 if (rdma_cap_ib_cm(id->device, id->port_num)) {
3598 if (id->qp_type == IB_QPT_UD) {
3599 if (conn_param)
3600 ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
3601 conn_param->qkey,
3602 conn_param->private_data,
3603 conn_param->private_data_len);
3604 else
3605 ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
3606 0, NULL, 0);
3607 } else {
3608 if (conn_param)
3609 ret = cma_accept_ib(id_priv, conn_param);
3610 else
3611 ret = cma_rep_recv(id_priv);
3612 }
3613 } else if (rdma_cap_iw_cm(id->device, id->port_num))
3614 ret = cma_accept_iw(id_priv, conn_param);
3615 else
3616 ret = -ENOSYS;
3617
3618 if (ret)
3619 goto reject;
3620
3621 return 0;
3622 reject:
3623 cma_modify_qp_err(id_priv);
3624 rdma_reject(id, NULL, 0);
3625 return ret;
3626 }
3627 EXPORT_SYMBOL(rdma_accept);
3628
3629 int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event)
3630 {
3631 struct rdma_id_private *id_priv;
3632 int ret;
3633
3634 id_priv = container_of(id, struct rdma_id_private, id);
3635 if (!id_priv->cm_id.ib)
3636 return -EINVAL;
3637
3638 switch (id->device->node_type) {
3639 case RDMA_NODE_IB_CA:
3640 ret = ib_cm_notify(id_priv->cm_id.ib, event);
3641 break;
3642 default:
3643 ret = 0;
3644 break;
3645 }
3646 return ret;
3647 }
3648 EXPORT_SYMBOL(rdma_notify);
3649
3650 int rdma_reject(struct rdma_cm_id *id, const void *private_data,
3651 u8 private_data_len)
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 if (id->qp_type == IB_QPT_UD)
3662 ret = cma_send_sidr_rep(id_priv, IB_SIDR_REJECT, 0,
3663 private_data, private_data_len);
3664 else
3665 ret = ib_send_cm_rej(id_priv->cm_id.ib,
3666 IB_CM_REJ_CONSUMER_DEFINED, NULL,
3667 0, private_data, private_data_len);
3668 } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
3669 ret = iw_cm_reject(id_priv->cm_id.iw,
3670 private_data, private_data_len);
3671 } else
3672 ret = -ENOSYS;
3673
3674 return ret;
3675 }
3676 EXPORT_SYMBOL(rdma_reject);
3677
3678 int rdma_disconnect(struct rdma_cm_id *id)
3679 {
3680 struct rdma_id_private *id_priv;
3681 int ret;
3682
3683 id_priv = container_of(id, struct rdma_id_private, id);
3684 if (!id_priv->cm_id.ib)
3685 return -EINVAL;
3686
3687 if (rdma_cap_ib_cm(id->device, id->port_num)) {
3688 ret = cma_modify_qp_err(id_priv);
3689 if (ret)
3690 goto out;
3691 /* Initiate or respond to a disconnect. */
3692 if (ib_send_cm_dreq(id_priv->cm_id.ib, NULL, 0))
3693 ib_send_cm_drep(id_priv->cm_id.ib, NULL, 0);
3694 } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
3695 ret = iw_cm_disconnect(id_priv->cm_id.iw, 0);
3696 } else
3697 ret = -EINVAL;
3698
3699 out:
3700 return ret;
3701 }
3702 EXPORT_SYMBOL(rdma_disconnect);
3703
3704 static int cma_ib_mc_handler(int status, struct ib_sa_multicast *multicast)
3705 {
3706 struct rdma_id_private *id_priv;
3707 struct cma_multicast *mc = multicast->context;
3708 struct rdma_cm_event event;
3709 int ret = 0;
3710
3711 id_priv = mc->id_priv;
3712 mutex_lock(&id_priv->handler_mutex);
3713 if (id_priv->state != RDMA_CM_ADDR_BOUND &&
3714 id_priv->state != RDMA_CM_ADDR_RESOLVED)
3715 goto out;
3716
3717 if (!status)
3718 status = cma_set_qkey(id_priv, be32_to_cpu(multicast->rec.qkey));
3719 mutex_lock(&id_priv->qp_mutex);
3720 if (!status && id_priv->id.qp)
3721 status = ib_attach_mcast(id_priv->id.qp, &multicast->rec.mgid,
3722 be16_to_cpu(multicast->rec.mlid));
3723 mutex_unlock(&id_priv->qp_mutex);
3724
3725 memset(&event, 0, sizeof event);
3726 event.status = status;
3727 event.param.ud.private_data = mc->context;
3728 if (!status) {
3729 struct rdma_dev_addr *dev_addr =
3730 &id_priv->id.route.addr.dev_addr;
3731 struct net_device *ndev =
3732 dev_get_by_index(&init_net, dev_addr->bound_dev_if);
3733 enum ib_gid_type gid_type =
3734 id_priv->cma_dev->default_gid_type[id_priv->id.port_num -
3735 rdma_start_port(id_priv->cma_dev->device)];
3736
3737 event.event = RDMA_CM_EVENT_MULTICAST_JOIN;
3738 ib_init_ah_from_mcmember(id_priv->id.device,
3739 id_priv->id.port_num, &multicast->rec,
3740 ndev, gid_type,
3741 &event.param.ud.ah_attr);
3742 event.param.ud.qp_num = 0xFFFFFF;
3743 event.param.ud.qkey = be32_to_cpu(multicast->rec.qkey);
3744 if (ndev)
3745 dev_put(ndev);
3746 } else
3747 event.event = RDMA_CM_EVENT_MULTICAST_ERROR;
3748
3749 ret = id_priv->id.event_handler(&id_priv->id, &event);
3750 if (ret) {
3751 cma_exch(id_priv, RDMA_CM_DESTROYING);
3752 mutex_unlock(&id_priv->handler_mutex);
3753 rdma_destroy_id(&id_priv->id);
3754 return 0;
3755 }
3756
3757 out:
3758 mutex_unlock(&id_priv->handler_mutex);
3759 return 0;
3760 }
3761
3762 static void cma_set_mgid(struct rdma_id_private *id_priv,
3763 struct sockaddr *addr, union ib_gid *mgid)
3764 {
3765 unsigned char mc_map[MAX_ADDR_LEN];
3766 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
3767 struct sockaddr_in *sin = (struct sockaddr_in *) addr;
3768 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) addr;
3769
3770 if (cma_any_addr(addr)) {
3771 memset(mgid, 0, sizeof *mgid);
3772 } else if ((addr->sa_family == AF_INET6) &&
3773 ((be32_to_cpu(sin6->sin6_addr.s6_addr32[0]) & 0xFFF0FFFF) ==
3774 0xFF10A01B)) {
3775 /* IPv6 address is an SA assigned MGID. */
3776 memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
3777 } else if (addr->sa_family == AF_IB) {
3778 memcpy(mgid, &((struct sockaddr_ib *) addr)->sib_addr, sizeof *mgid);
3779 } else if ((addr->sa_family == AF_INET6)) {
3780 ipv6_ib_mc_map(&sin6->sin6_addr, dev_addr->broadcast, mc_map);
3781 if (id_priv->id.ps == RDMA_PS_UDP)
3782 mc_map[7] = 0x01; /* Use RDMA CM signature */
3783 *mgid = *(union ib_gid *) (mc_map + 4);
3784 } else {
3785 ip_ib_mc_map(sin->sin_addr.s_addr, dev_addr->broadcast, mc_map);
3786 if (id_priv->id.ps == RDMA_PS_UDP)
3787 mc_map[7] = 0x01; /* Use RDMA CM signature */
3788 *mgid = *(union ib_gid *) (mc_map + 4);
3789 }
3790 }
3791
3792 static void cma_query_sa_classport_info_cb(int status,
3793 struct ib_class_port_info *rec,
3794 void *context)
3795 {
3796 struct class_port_info_context *cb_ctx = context;
3797
3798 WARN_ON(!context);
3799
3800 if (status || !rec) {
3801 pr_debug("RDMA CM: %s port %u failed query ClassPortInfo status: %d\n",
3802 cb_ctx->device->name, cb_ctx->port_num, status);
3803 goto out;
3804 }
3805
3806 memcpy(cb_ctx->class_port_info, rec, sizeof(struct ib_class_port_info));
3807
3808 out:
3809 complete(&cb_ctx->done);
3810 }
3811
3812 static int cma_query_sa_classport_info(struct ib_device *device, u8 port_num,
3813 struct ib_class_port_info *class_port_info)
3814 {
3815 struct class_port_info_context *cb_ctx;
3816 int ret;
3817
3818 cb_ctx = kmalloc(sizeof(*cb_ctx), GFP_KERNEL);
3819 if (!cb_ctx)
3820 return -ENOMEM;
3821
3822 cb_ctx->device = device;
3823 cb_ctx->class_port_info = class_port_info;
3824 cb_ctx->port_num = port_num;
3825 init_completion(&cb_ctx->done);
3826
3827 ret = ib_sa_classport_info_rec_query(&sa_client, device, port_num,
3828 CMA_QUERY_CLASSPORT_INFO_TIMEOUT,
3829 GFP_KERNEL, cma_query_sa_classport_info_cb,
3830 cb_ctx, &cb_ctx->sa_query);
3831 if (ret < 0) {
3832 pr_err("RDMA CM: %s port %u failed to send ClassPortInfo query, ret: %d\n",
3833 device->name, port_num, ret);
3834 goto out;
3835 }
3836
3837 wait_for_completion(&cb_ctx->done);
3838
3839 out:
3840 kfree(cb_ctx);
3841 return ret;
3842 }
3843
3844 static int cma_join_ib_multicast(struct rdma_id_private *id_priv,
3845 struct cma_multicast *mc)
3846 {
3847 struct ib_sa_mcmember_rec rec;
3848 struct ib_class_port_info class_port_info;
3849 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
3850 ib_sa_comp_mask comp_mask;
3851 int ret;
3852
3853 ib_addr_get_mgid(dev_addr, &rec.mgid);
3854 ret = ib_sa_get_mcmember_rec(id_priv->id.device, id_priv->id.port_num,
3855 &rec.mgid, &rec);
3856 if (ret)
3857 return ret;
3858
3859 ret = cma_set_qkey(id_priv, 0);
3860 if (ret)
3861 return ret;
3862
3863 cma_set_mgid(id_priv, (struct sockaddr *) &mc->addr, &rec.mgid);
3864 rec.qkey = cpu_to_be32(id_priv->qkey);
3865 rdma_addr_get_sgid(dev_addr, &rec.port_gid);
3866 rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
3867 rec.join_state = mc->join_state;
3868
3869 if (rec.join_state == BIT(SENDONLY_FULLMEMBER_JOIN)) {
3870 ret = cma_query_sa_classport_info(id_priv->id.device,
3871 id_priv->id.port_num,
3872 &class_port_info);
3873
3874 if (ret)
3875 return ret;
3876
3877 if (!(ib_get_cpi_capmask2(&class_port_info) &
3878 IB_SA_CAP_MASK2_SENDONLY_FULL_MEM_SUPPORT)) {
3879 pr_warn("RDMA CM: %s port %u Unable to multicast join\n"
3880 "RDMA CM: SM doesn't support Send Only Full Member option\n",
3881 id_priv->id.device->name, id_priv->id.port_num);
3882 return -EOPNOTSUPP;
3883 }
3884 }
3885
3886 comp_mask = IB_SA_MCMEMBER_REC_MGID | IB_SA_MCMEMBER_REC_PORT_GID |
3887 IB_SA_MCMEMBER_REC_PKEY | IB_SA_MCMEMBER_REC_JOIN_STATE |
3888 IB_SA_MCMEMBER_REC_QKEY | IB_SA_MCMEMBER_REC_SL |
3889 IB_SA_MCMEMBER_REC_FLOW_LABEL |
3890 IB_SA_MCMEMBER_REC_TRAFFIC_CLASS;
3891
3892 if (id_priv->id.ps == RDMA_PS_IPOIB)
3893 comp_mask |= IB_SA_MCMEMBER_REC_RATE |
3894 IB_SA_MCMEMBER_REC_RATE_SELECTOR |
3895 IB_SA_MCMEMBER_REC_MTU_SELECTOR |
3896 IB_SA_MCMEMBER_REC_MTU |
3897 IB_SA_MCMEMBER_REC_HOP_LIMIT;
3898
3899 mc->multicast.ib = ib_sa_join_multicast(&sa_client, id_priv->id.device,
3900 id_priv->id.port_num, &rec,
3901 comp_mask, GFP_KERNEL,
3902 cma_ib_mc_handler, mc);
3903 return PTR_ERR_OR_ZERO(mc->multicast.ib);
3904 }
3905
3906 static void iboe_mcast_work_handler(struct work_struct *work)
3907 {
3908 struct iboe_mcast_work *mw = container_of(work, struct iboe_mcast_work, work);
3909 struct cma_multicast *mc = mw->mc;
3910 struct ib_sa_multicast *m = mc->multicast.ib;
3911
3912 mc->multicast.ib->context = mc;
3913 cma_ib_mc_handler(0, m);
3914 kref_put(&mc->mcref, release_mc);
3915 kfree(mw);
3916 }
3917
3918 static void cma_iboe_set_mgid(struct sockaddr *addr, union ib_gid *mgid)
3919 {
3920 struct sockaddr_in *sin = (struct sockaddr_in *)addr;
3921 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr;
3922
3923 if (cma_any_addr(addr)) {
3924 memset(mgid, 0, sizeof *mgid);
3925 } else if (addr->sa_family == AF_INET6) {
3926 memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
3927 } else {
3928 mgid->raw[0] = 0xff;
3929 mgid->raw[1] = 0x0e;
3930 mgid->raw[2] = 0;
3931 mgid->raw[3] = 0;
3932 mgid->raw[4] = 0;
3933 mgid->raw[5] = 0;
3934 mgid->raw[6] = 0;
3935 mgid->raw[7] = 0;
3936 mgid->raw[8] = 0;
3937 mgid->raw[9] = 0;
3938 mgid->raw[10] = 0xff;
3939 mgid->raw[11] = 0xff;
3940 *(__be32 *)(&mgid->raw[12]) = sin->sin_addr.s_addr;
3941 }
3942 }
3943
3944 static int cma_iboe_join_multicast(struct rdma_id_private *id_priv,
3945 struct cma_multicast *mc)
3946 {
3947 struct iboe_mcast_work *work;
3948 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
3949 int err = 0;
3950 struct sockaddr *addr = (struct sockaddr *)&mc->addr;
3951 struct net_device *ndev = NULL;
3952 enum ib_gid_type gid_type;
3953 bool send_only;
3954
3955 send_only = mc->join_state == BIT(SENDONLY_FULLMEMBER_JOIN);
3956
3957 if (cma_zero_addr((struct sockaddr *)&mc->addr))
3958 return -EINVAL;
3959
3960 work = kzalloc(sizeof *work, GFP_KERNEL);
3961 if (!work)
3962 return -ENOMEM;
3963
3964 mc->multicast.ib = kzalloc(sizeof(struct ib_sa_multicast), GFP_KERNEL);
3965 if (!mc->multicast.ib) {
3966 err = -ENOMEM;
3967 goto out1;
3968 }
3969
3970 cma_iboe_set_mgid(addr, &mc->multicast.ib->rec.mgid);
3971
3972 mc->multicast.ib->rec.pkey = cpu_to_be16(0xffff);
3973 if (id_priv->id.ps == RDMA_PS_UDP)
3974 mc->multicast.ib->rec.qkey = cpu_to_be32(RDMA_UDP_QKEY);
3975
3976 if (dev_addr->bound_dev_if)
3977 ndev = dev_get_by_index(&init_net, dev_addr->bound_dev_if);
3978 if (!ndev) {
3979 err = -ENODEV;
3980 goto out2;
3981 }
3982 mc->multicast.ib->rec.rate = iboe_get_rate(ndev);
3983 mc->multicast.ib->rec.hop_limit = 1;
3984 mc->multicast.ib->rec.mtu = iboe_get_mtu(ndev->mtu);
3985
3986 gid_type = id_priv->cma_dev->default_gid_type[id_priv->id.port_num -
3987 rdma_start_port(id_priv->cma_dev->device)];
3988 if (addr->sa_family == AF_INET) {
3989 if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) {
3990 mc->multicast.ib->rec.hop_limit = IPV6_DEFAULT_HOPLIMIT;
3991 if (!send_only) {
3992 err = cma_igmp_send(ndev, &mc->multicast.ib->rec.mgid,
3993 true);
3994 if (!err)
3995 mc->igmp_joined = true;
3996 }
3997 }
3998 } else {
3999 if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP)
4000 err = -ENOTSUPP;
4001 }
4002 dev_put(ndev);
4003 if (err || !mc->multicast.ib->rec.mtu) {
4004 if (!err)
4005 err = -EINVAL;
4006 goto out2;
4007 }
4008 rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
4009 &mc->multicast.ib->rec.port_gid);
4010 work->id = id_priv;
4011 work->mc = mc;
4012 INIT_WORK(&work->work, iboe_mcast_work_handler);
4013 kref_get(&mc->mcref);
4014 queue_work(cma_wq, &work->work);
4015
4016 return 0;
4017
4018 out2:
4019 kfree(mc->multicast.ib);
4020 out1:
4021 kfree(work);
4022 return err;
4023 }
4024
4025 int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
4026 u8 join_state, void *context)
4027 {
4028 struct rdma_id_private *id_priv;
4029 struct cma_multicast *mc;
4030 int ret;
4031
4032 id_priv = container_of(id, struct rdma_id_private, id);
4033 if (!cma_comp(id_priv, RDMA_CM_ADDR_BOUND) &&
4034 !cma_comp(id_priv, RDMA_CM_ADDR_RESOLVED))
4035 return -EINVAL;
4036
4037 mc = kmalloc(sizeof *mc, GFP_KERNEL);
4038 if (!mc)
4039 return -ENOMEM;
4040
4041 memcpy(&mc->addr, addr, rdma_addr_size(addr));
4042 mc->context = context;
4043 mc->id_priv = id_priv;
4044 mc->igmp_joined = false;
4045 mc->join_state = join_state;
4046 spin_lock(&id_priv->lock);
4047 list_add(&mc->list, &id_priv->mc_list);
4048 spin_unlock(&id_priv->lock);
4049
4050 if (rdma_protocol_roce(id->device, id->port_num)) {
4051 kref_init(&mc->mcref);
4052 ret = cma_iboe_join_multicast(id_priv, mc);
4053 } else if (rdma_cap_ib_mcast(id->device, id->port_num))
4054 ret = cma_join_ib_multicast(id_priv, mc);
4055 else
4056 ret = -ENOSYS;
4057
4058 if (ret) {
4059 spin_lock_irq(&id_priv->lock);
4060 list_del(&mc->list);
4061 spin_unlock_irq(&id_priv->lock);
4062 kfree(mc);
4063 }
4064 return ret;
4065 }
4066 EXPORT_SYMBOL(rdma_join_multicast);
4067
4068 void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr)
4069 {
4070 struct rdma_id_private *id_priv;
4071 struct cma_multicast *mc;
4072
4073 id_priv = container_of(id, struct rdma_id_private, id);
4074 spin_lock_irq(&id_priv->lock);
4075 list_for_each_entry(mc, &id_priv->mc_list, list) {
4076 if (!memcmp(&mc->addr, addr, rdma_addr_size(addr))) {
4077 list_del(&mc->list);
4078 spin_unlock_irq(&id_priv->lock);
4079
4080 if (id->qp)
4081 ib_detach_mcast(id->qp,
4082 &mc->multicast.ib->rec.mgid,
4083 be16_to_cpu(mc->multicast.ib->rec.mlid));
4084
4085 BUG_ON(id_priv->cma_dev->device != id->device);
4086
4087 if (rdma_cap_ib_mcast(id->device, id->port_num)) {
4088 ib_sa_free_multicast(mc->multicast.ib);
4089 kfree(mc);
4090 } else if (rdma_protocol_roce(id->device, id->port_num)) {
4091 if (mc->igmp_joined) {
4092 struct rdma_dev_addr *dev_addr =
4093 &id->route.addr.dev_addr;
4094 struct net_device *ndev = NULL;
4095
4096 if (dev_addr->bound_dev_if)
4097 ndev = dev_get_by_index(&init_net,
4098 dev_addr->bound_dev_if);
4099 if (ndev) {
4100 cma_igmp_send(ndev,
4101 &mc->multicast.ib->rec.mgid,
4102 false);
4103 dev_put(ndev);
4104 }
4105 mc->igmp_joined = false;
4106 }
4107 kref_put(&mc->mcref, release_mc);
4108 }
4109 return;
4110 }
4111 }
4112 spin_unlock_irq(&id_priv->lock);
4113 }
4114 EXPORT_SYMBOL(rdma_leave_multicast);
4115
4116 static int cma_netdev_change(struct net_device *ndev, struct rdma_id_private *id_priv)
4117 {
4118 struct rdma_dev_addr *dev_addr;
4119 struct cma_ndev_work *work;
4120
4121 dev_addr = &id_priv->id.route.addr.dev_addr;
4122
4123 if ((dev_addr->bound_dev_if == ndev->ifindex) &&
4124 (net_eq(dev_net(ndev), dev_addr->net)) &&
4125 memcmp(dev_addr->src_dev_addr, ndev->dev_addr, ndev->addr_len)) {
4126 pr_info("RDMA CM addr change for ndev %s used by id %p\n",
4127 ndev->name, &id_priv->id);
4128 work = kzalloc(sizeof *work, GFP_KERNEL);
4129 if (!work)
4130 return -ENOMEM;
4131
4132 INIT_WORK(&work->work, cma_ndev_work_handler);
4133 work->id = id_priv;
4134 work->event.event = RDMA_CM_EVENT_ADDR_CHANGE;
4135 atomic_inc(&id_priv->refcount);
4136 queue_work(cma_wq, &work->work);
4137 }
4138
4139 return 0;
4140 }
4141
4142 static int cma_netdev_callback(struct notifier_block *self, unsigned long event,
4143 void *ptr)
4144 {
4145 struct net_device *ndev = netdev_notifier_info_to_dev(ptr);
4146 struct cma_device *cma_dev;
4147 struct rdma_id_private *id_priv;
4148 int ret = NOTIFY_DONE;
4149
4150 if (event != NETDEV_BONDING_FAILOVER)
4151 return NOTIFY_DONE;
4152
4153 if (!(ndev->flags & IFF_MASTER) || !(ndev->priv_flags & IFF_BONDING))
4154 return NOTIFY_DONE;
4155
4156 mutex_lock(&lock);
4157 list_for_each_entry(cma_dev, &dev_list, list)
4158 list_for_each_entry(id_priv, &cma_dev->id_list, list) {
4159 ret = cma_netdev_change(ndev, id_priv);
4160 if (ret)
4161 goto out;
4162 }
4163
4164 out:
4165 mutex_unlock(&lock);
4166 return ret;
4167 }
4168
4169 static struct notifier_block cma_nb = {
4170 .notifier_call = cma_netdev_callback
4171 };
4172
4173 static void cma_add_one(struct ib_device *device)
4174 {
4175 struct cma_device *cma_dev;
4176 struct rdma_id_private *id_priv;
4177 unsigned int i;
4178 unsigned long supported_gids = 0;
4179
4180 cma_dev = kmalloc(sizeof *cma_dev, GFP_KERNEL);
4181 if (!cma_dev)
4182 return;
4183
4184 cma_dev->device = device;
4185 cma_dev->default_gid_type = kcalloc(device->phys_port_cnt,
4186 sizeof(*cma_dev->default_gid_type),
4187 GFP_KERNEL);
4188 if (!cma_dev->default_gid_type) {
4189 kfree(cma_dev);
4190 return;
4191 }
4192 for (i = rdma_start_port(device); i <= rdma_end_port(device); i++) {
4193 supported_gids = roce_gid_type_mask_support(device, i);
4194 WARN_ON(!supported_gids);
4195 cma_dev->default_gid_type[i - rdma_start_port(device)] =
4196 find_first_bit(&supported_gids, BITS_PER_LONG);
4197 }
4198
4199 init_completion(&cma_dev->comp);
4200 atomic_set(&cma_dev->refcount, 1);
4201 INIT_LIST_HEAD(&cma_dev->id_list);
4202 ib_set_client_data(device, &cma_client, cma_dev);
4203
4204 mutex_lock(&lock);
4205 list_add_tail(&cma_dev->list, &dev_list);
4206 list_for_each_entry(id_priv, &listen_any_list, list)
4207 cma_listen_on_dev(id_priv, cma_dev);
4208 mutex_unlock(&lock);
4209 }
4210
4211 static int cma_remove_id_dev(struct rdma_id_private *id_priv)
4212 {
4213 struct rdma_cm_event event;
4214 enum rdma_cm_state state;
4215 int ret = 0;
4216
4217 /* Record that we want to remove the device */
4218 state = cma_exch(id_priv, RDMA_CM_DEVICE_REMOVAL);
4219 if (state == RDMA_CM_DESTROYING)
4220 return 0;
4221
4222 cma_cancel_operation(id_priv, state);
4223 mutex_lock(&id_priv->handler_mutex);
4224
4225 /* Check for destruction from another callback. */
4226 if (!cma_comp(id_priv, RDMA_CM_DEVICE_REMOVAL))
4227 goto out;
4228
4229 memset(&event, 0, sizeof event);
4230 event.event = RDMA_CM_EVENT_DEVICE_REMOVAL;
4231 ret = id_priv->id.event_handler(&id_priv->id, &event);
4232 out:
4233 mutex_unlock(&id_priv->handler_mutex);
4234 return ret;
4235 }
4236
4237 static void cma_process_remove(struct cma_device *cma_dev)
4238 {
4239 struct rdma_id_private *id_priv;
4240 int ret;
4241
4242 mutex_lock(&lock);
4243 while (!list_empty(&cma_dev->id_list)) {
4244 id_priv = list_entry(cma_dev->id_list.next,
4245 struct rdma_id_private, list);
4246
4247 list_del(&id_priv->listen_list);
4248 list_del_init(&id_priv->list);
4249 atomic_inc(&id_priv->refcount);
4250 mutex_unlock(&lock);
4251
4252 ret = id_priv->internal_id ? 1 : cma_remove_id_dev(id_priv);
4253 cma_deref_id(id_priv);
4254 if (ret)
4255 rdma_destroy_id(&id_priv->id);
4256
4257 mutex_lock(&lock);
4258 }
4259 mutex_unlock(&lock);
4260
4261 cma_deref_dev(cma_dev);
4262 wait_for_completion(&cma_dev->comp);
4263 }
4264
4265 static void cma_remove_one(struct ib_device *device, void *client_data)
4266 {
4267 struct cma_device *cma_dev = client_data;
4268
4269 if (!cma_dev)
4270 return;
4271
4272 mutex_lock(&lock);
4273 list_del(&cma_dev->list);
4274 mutex_unlock(&lock);
4275
4276 cma_process_remove(cma_dev);
4277 kfree(cma_dev->default_gid_type);
4278 kfree(cma_dev);
4279 }
4280
4281 static int cma_get_id_stats(struct sk_buff *skb, struct netlink_callback *cb)
4282 {
4283 struct nlmsghdr *nlh;
4284 struct rdma_cm_id_stats *id_stats;
4285 struct rdma_id_private *id_priv;
4286 struct rdma_cm_id *id = NULL;
4287 struct cma_device *cma_dev;
4288 int i_dev = 0, i_id = 0;
4289
4290 /*
4291 * We export all of the IDs as a sequence of messages. Each
4292 * ID gets its own netlink message.
4293 */
4294 mutex_lock(&lock);
4295
4296 list_for_each_entry(cma_dev, &dev_list, list) {
4297 if (i_dev < cb->args[0]) {
4298 i_dev++;
4299 continue;
4300 }
4301
4302 i_id = 0;
4303 list_for_each_entry(id_priv, &cma_dev->id_list, list) {
4304 if (i_id < cb->args[1]) {
4305 i_id++;
4306 continue;
4307 }
4308
4309 id_stats = ibnl_put_msg(skb, &nlh, cb->nlh->nlmsg_seq,
4310 sizeof *id_stats, RDMA_NL_RDMA_CM,
4311 RDMA_NL_RDMA_CM_ID_STATS,
4312 NLM_F_MULTI);
4313 if (!id_stats)
4314 goto out;
4315
4316 memset(id_stats, 0, sizeof *id_stats);
4317 id = &id_priv->id;
4318 id_stats->node_type = id->route.addr.dev_addr.dev_type;
4319 id_stats->port_num = id->port_num;
4320 id_stats->bound_dev_if =
4321 id->route.addr.dev_addr.bound_dev_if;
4322
4323 if (ibnl_put_attr(skb, nlh,
4324 rdma_addr_size(cma_src_addr(id_priv)),
4325 cma_src_addr(id_priv),
4326 RDMA_NL_RDMA_CM_ATTR_SRC_ADDR))
4327 goto out;
4328 if (ibnl_put_attr(skb, nlh,
4329 rdma_addr_size(cma_src_addr(id_priv)),
4330 cma_dst_addr(id_priv),
4331 RDMA_NL_RDMA_CM_ATTR_DST_ADDR))
4332 goto out;
4333
4334 id_stats->pid = id_priv->owner;
4335 id_stats->port_space = id->ps;
4336 id_stats->cm_state = id_priv->state;
4337 id_stats->qp_num = id_priv->qp_num;
4338 id_stats->qp_type = id->qp_type;
4339
4340 i_id++;
4341 }
4342
4343 cb->args[1] = 0;
4344 i_dev++;
4345 }
4346
4347 out:
4348 mutex_unlock(&lock);
4349 cb->args[0] = i_dev;
4350 cb->args[1] = i_id;
4351
4352 return skb->len;
4353 }
4354
4355 static const struct ibnl_client_cbs cma_cb_table[] = {
4356 [RDMA_NL_RDMA_CM_ID_STATS] = { .dump = cma_get_id_stats,
4357 .module = THIS_MODULE },
4358 };
4359
4360 static int cma_init_net(struct net *net)
4361 {
4362 struct cma_pernet *pernet = cma_pernet(net);
4363
4364 idr_init(&pernet->tcp_ps);
4365 idr_init(&pernet->udp_ps);
4366 idr_init(&pernet->ipoib_ps);
4367 idr_init(&pernet->ib_ps);
4368
4369 return 0;
4370 }
4371
4372 static void cma_exit_net(struct net *net)
4373 {
4374 struct cma_pernet *pernet = cma_pernet(net);
4375
4376 idr_destroy(&pernet->tcp_ps);
4377 idr_destroy(&pernet->udp_ps);
4378 idr_destroy(&pernet->ipoib_ps);
4379 idr_destroy(&pernet->ib_ps);
4380 }
4381
4382 static struct pernet_operations cma_pernet_operations = {
4383 .init = cma_init_net,
4384 .exit = cma_exit_net,
4385 .id = &cma_pernet_id,
4386 .size = sizeof(struct cma_pernet),
4387 };
4388
4389 static int __init cma_init(void)
4390 {
4391 int ret;
4392
4393 cma_wq = alloc_ordered_workqueue("rdma_cm", WQ_MEM_RECLAIM);
4394 if (!cma_wq)
4395 return -ENOMEM;
4396
4397 ret = register_pernet_subsys(&cma_pernet_operations);
4398 if (ret)
4399 goto err_wq;
4400
4401 ib_sa_register_client(&sa_client);
4402 rdma_addr_register_client(&addr_client);
4403 register_netdevice_notifier(&cma_nb);
4404
4405 ret = ib_register_client(&cma_client);
4406 if (ret)
4407 goto err;
4408
4409 if (ibnl_add_client(RDMA_NL_RDMA_CM, ARRAY_SIZE(cma_cb_table),
4410 cma_cb_table))
4411 pr_warn("RDMA CMA: failed to add netlink callback\n");
4412 cma_configfs_init();
4413
4414 return 0;
4415
4416 err:
4417 unregister_netdevice_notifier(&cma_nb);
4418 rdma_addr_unregister_client(&addr_client);
4419 ib_sa_unregister_client(&sa_client);
4420 err_wq:
4421 destroy_workqueue(cma_wq);
4422 return ret;
4423 }
4424
4425 static void __exit cma_cleanup(void)
4426 {
4427 cma_configfs_exit();
4428 ibnl_remove_client(RDMA_NL_RDMA_CM);
4429 ib_unregister_client(&cma_client);
4430 unregister_netdevice_notifier(&cma_nb);
4431 rdma_addr_unregister_client(&addr_client);
4432 ib_sa_unregister_client(&sa_client);
4433 unregister_pernet_subsys(&cma_pernet_operations);
4434 destroy_workqueue(cma_wq);
4435 }
4436
4437 module_init(cma_init);
4438 module_exit(cma_cleanup);
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