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Merge branches 'pm-core', 'pm-clk', 'pm-domains' and 'pm-pci'
[deliverable/linux.git] / drivers / infiniband / core / cma.c
1 /*
2 * Copyright (c) 2005 Voltaire Inc. All rights reserved.
3 * Copyright (c) 2002-2005, Network Appliance, Inc. All rights reserved.
4 * Copyright (c) 1999-2005, Mellanox Technologies, Inc. All rights reserved.
5 * Copyright (c) 2005-2006 Intel Corporation. All rights reserved.
6 *
7 * This software is available to you under a choice of one of two
8 * licenses. You may choose to be licensed under the terms of the GNU
9 * General Public License (GPL) Version 2, available from the file
10 * COPYING in the main directory of this source tree, or the
11 * OpenIB.org BSD license below:
12 *
13 * Redistribution and use in source and binary forms, with or
14 * without modification, are permitted provided that the following
15 * conditions are met:
16 *
17 * - Redistributions of source code must retain the above
18 * copyright notice, this list of conditions and the following
19 * disclaimer.
20 *
21 * - Redistributions in binary form must reproduce the above
22 * copyright notice, this list of conditions and the following
23 * disclaimer in the documentation and/or other materials
24 * provided with the distribution.
25 *
26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
33 * SOFTWARE.
34 */
35
36 #include <linux/completion.h>
37 #include <linux/in.h>
38 #include <linux/in6.h>
39 #include <linux/mutex.h>
40 #include <linux/random.h>
41 #include <linux/igmp.h>
42 #include <linux/idr.h>
43 #include <linux/inetdevice.h>
44 #include <linux/slab.h>
45 #include <linux/module.h>
46 #include <net/route.h>
47
48 #include <net/net_namespace.h>
49 #include <net/netns/generic.h>
50 #include <net/tcp.h>
51 #include <net/ipv6.h>
52 #include <net/ip_fib.h>
53 #include <net/ip6_route.h>
54
55 #include <rdma/rdma_cm.h>
56 #include <rdma/rdma_cm_ib.h>
57 #include <rdma/rdma_netlink.h>
58 #include <rdma/ib.h>
59 #include <rdma/ib_cache.h>
60 #include <rdma/ib_cm.h>
61 #include <rdma/ib_sa.h>
62 #include <rdma/iw_cm.h>
63
64 #include "core_priv.h"
65
66 MODULE_AUTHOR("Sean Hefty");
67 MODULE_DESCRIPTION("Generic RDMA CM Agent");
68 MODULE_LICENSE("Dual BSD/GPL");
69
70 #define CMA_CM_RESPONSE_TIMEOUT 20
71 #define CMA_MAX_CM_RETRIES 15
72 #define CMA_CM_MRA_SETTING (IB_CM_MRA_FLAG_DELAY | 24)
73 #define CMA_IBOE_PACKET_LIFETIME 18
74
75 static const char * const cma_events[] = {
76 [RDMA_CM_EVENT_ADDR_RESOLVED] = "address resolved",
77 [RDMA_CM_EVENT_ADDR_ERROR] = "address error",
78 [RDMA_CM_EVENT_ROUTE_RESOLVED] = "route resolved ",
79 [RDMA_CM_EVENT_ROUTE_ERROR] = "route error",
80 [RDMA_CM_EVENT_CONNECT_REQUEST] = "connect request",
81 [RDMA_CM_EVENT_CONNECT_RESPONSE] = "connect response",
82 [RDMA_CM_EVENT_CONNECT_ERROR] = "connect error",
83 [RDMA_CM_EVENT_UNREACHABLE] = "unreachable",
84 [RDMA_CM_EVENT_REJECTED] = "rejected",
85 [RDMA_CM_EVENT_ESTABLISHED] = "established",
86 [RDMA_CM_EVENT_DISCONNECTED] = "disconnected",
87 [RDMA_CM_EVENT_DEVICE_REMOVAL] = "device removal",
88 [RDMA_CM_EVENT_MULTICAST_JOIN] = "multicast join",
89 [RDMA_CM_EVENT_MULTICAST_ERROR] = "multicast error",
90 [RDMA_CM_EVENT_ADDR_CHANGE] = "address change",
91 [RDMA_CM_EVENT_TIMEWAIT_EXIT] = "timewait exit",
92 };
93
94 const char *__attribute_const__ rdma_event_msg(enum rdma_cm_event_type event)
95 {
96 size_t index = event;
97
98 return (index < ARRAY_SIZE(cma_events) && cma_events[index]) ?
99 cma_events[index] : "unrecognized event";
100 }
101 EXPORT_SYMBOL(rdma_event_msg);
102
103 static void cma_add_one(struct ib_device *device);
104 static void cma_remove_one(struct ib_device *device, void *client_data);
105
106 static struct ib_client cma_client = {
107 .name = "cma",
108 .add = cma_add_one,
109 .remove = cma_remove_one
110 };
111
112 static struct ib_sa_client sa_client;
113 static struct rdma_addr_client addr_client;
114 static LIST_HEAD(dev_list);
115 static LIST_HEAD(listen_any_list);
116 static DEFINE_MUTEX(lock);
117 static struct workqueue_struct *cma_wq;
118 static int cma_pernet_id;
119
120 struct cma_pernet {
121 struct idr tcp_ps;
122 struct idr udp_ps;
123 struct idr ipoib_ps;
124 struct idr ib_ps;
125 };
126
127 static struct cma_pernet *cma_pernet(struct net *net)
128 {
129 return net_generic(net, cma_pernet_id);
130 }
131
132 static struct idr *cma_pernet_idr(struct net *net, enum rdma_port_space ps)
133 {
134 struct cma_pernet *pernet = cma_pernet(net);
135
136 switch (ps) {
137 case RDMA_PS_TCP:
138 return &pernet->tcp_ps;
139 case RDMA_PS_UDP:
140 return &pernet->udp_ps;
141 case RDMA_PS_IPOIB:
142 return &pernet->ipoib_ps;
143 case RDMA_PS_IB:
144 return &pernet->ib_ps;
145 default:
146 return NULL;
147 }
148 }
149
150 struct cma_device {
151 struct list_head list;
152 struct ib_device *device;
153 struct completion comp;
154 atomic_t refcount;
155 struct list_head id_list;
156 enum ib_gid_type *default_gid_type;
157 };
158
159 struct rdma_bind_list {
160 enum rdma_port_space ps;
161 struct hlist_head owners;
162 unsigned short port;
163 };
164
165 static int cma_ps_alloc(struct net *net, enum rdma_port_space ps,
166 struct rdma_bind_list *bind_list, int snum)
167 {
168 struct idr *idr = cma_pernet_idr(net, ps);
169
170 return idr_alloc(idr, bind_list, snum, snum + 1, GFP_KERNEL);
171 }
172
173 static struct rdma_bind_list *cma_ps_find(struct net *net,
174 enum rdma_port_space ps, int snum)
175 {
176 struct idr *idr = cma_pernet_idr(net, ps);
177
178 return idr_find(idr, snum);
179 }
180
181 static void cma_ps_remove(struct net *net, enum rdma_port_space ps, int snum)
182 {
183 struct idr *idr = cma_pernet_idr(net, ps);
184
185 idr_remove(idr, snum);
186 }
187
188 enum {
189 CMA_OPTION_AFONLY,
190 };
191
192 void cma_ref_dev(struct cma_device *cma_dev)
193 {
194 atomic_inc(&cma_dev->refcount);
195 }
196
197 struct cma_device *cma_enum_devices_by_ibdev(cma_device_filter filter,
198 void *cookie)
199 {
200 struct cma_device *cma_dev;
201 struct cma_device *found_cma_dev = NULL;
202
203 mutex_lock(&lock);
204
205 list_for_each_entry(cma_dev, &dev_list, list)
206 if (filter(cma_dev->device, cookie)) {
207 found_cma_dev = cma_dev;
208 break;
209 }
210
211 if (found_cma_dev)
212 cma_ref_dev(found_cma_dev);
213 mutex_unlock(&lock);
214 return found_cma_dev;
215 }
216
217 int cma_get_default_gid_type(struct cma_device *cma_dev,
218 unsigned int port)
219 {
220 if (port < rdma_start_port(cma_dev->device) ||
221 port > rdma_end_port(cma_dev->device))
222 return -EINVAL;
223
224 return cma_dev->default_gid_type[port - rdma_start_port(cma_dev->device)];
225 }
226
227 int cma_set_default_gid_type(struct cma_device *cma_dev,
228 unsigned int port,
229 enum ib_gid_type default_gid_type)
230 {
231 unsigned long supported_gids;
232
233 if (port < rdma_start_port(cma_dev->device) ||
234 port > rdma_end_port(cma_dev->device))
235 return -EINVAL;
236
237 supported_gids = roce_gid_type_mask_support(cma_dev->device, port);
238
239 if (!(supported_gids & 1 << default_gid_type))
240 return -EINVAL;
241
242 cma_dev->default_gid_type[port - rdma_start_port(cma_dev->device)] =
243 default_gid_type;
244
245 return 0;
246 }
247
248 struct ib_device *cma_get_ib_dev(struct cma_device *cma_dev)
249 {
250 return cma_dev->device;
251 }
252
253 /*
254 * Device removal can occur at anytime, so we need extra handling to
255 * serialize notifying the user of device removal with other callbacks.
256 * We do this by disabling removal notification while a callback is in process,
257 * and reporting it after the callback completes.
258 */
259 struct rdma_id_private {
260 struct rdma_cm_id id;
261
262 struct rdma_bind_list *bind_list;
263 struct hlist_node node;
264 struct list_head list; /* listen_any_list or cma_device.list */
265 struct list_head listen_list; /* per device listens */
266 struct cma_device *cma_dev;
267 struct list_head mc_list;
268
269 int internal_id;
270 enum rdma_cm_state state;
271 spinlock_t lock;
272 struct mutex qp_mutex;
273
274 struct completion comp;
275 atomic_t refcount;
276 struct mutex handler_mutex;
277
278 int backlog;
279 int timeout_ms;
280 struct ib_sa_query *query;
281 int query_id;
282 union {
283 struct ib_cm_id *ib;
284 struct iw_cm_id *iw;
285 } cm_id;
286
287 u32 seq_num;
288 u32 qkey;
289 u32 qp_num;
290 pid_t owner;
291 u32 options;
292 u8 srq;
293 u8 tos;
294 u8 reuseaddr;
295 u8 afonly;
296 enum ib_gid_type gid_type;
297 };
298
299 struct cma_multicast {
300 struct rdma_id_private *id_priv;
301 union {
302 struct ib_sa_multicast *ib;
303 } multicast;
304 struct list_head list;
305 void *context;
306 struct sockaddr_storage addr;
307 struct kref mcref;
308 bool igmp_joined;
309 };
310
311 struct cma_work {
312 struct work_struct work;
313 struct rdma_id_private *id;
314 enum rdma_cm_state old_state;
315 enum rdma_cm_state new_state;
316 struct rdma_cm_event event;
317 };
318
319 struct cma_ndev_work {
320 struct work_struct work;
321 struct rdma_id_private *id;
322 struct rdma_cm_event event;
323 };
324
325 struct iboe_mcast_work {
326 struct work_struct work;
327 struct rdma_id_private *id;
328 struct cma_multicast *mc;
329 };
330
331 union cma_ip_addr {
332 struct in6_addr ip6;
333 struct {
334 __be32 pad[3];
335 __be32 addr;
336 } ip4;
337 };
338
339 struct cma_hdr {
340 u8 cma_version;
341 u8 ip_version; /* IP version: 7:4 */
342 __be16 port;
343 union cma_ip_addr src_addr;
344 union cma_ip_addr dst_addr;
345 };
346
347 #define CMA_VERSION 0x00
348
349 struct cma_req_info {
350 struct ib_device *device;
351 int port;
352 union ib_gid local_gid;
353 __be64 service_id;
354 u16 pkey;
355 bool has_gid:1;
356 };
357
358 static int cma_comp(struct rdma_id_private *id_priv, enum rdma_cm_state comp)
359 {
360 unsigned long flags;
361 int ret;
362
363 spin_lock_irqsave(&id_priv->lock, flags);
364 ret = (id_priv->state == comp);
365 spin_unlock_irqrestore(&id_priv->lock, flags);
366 return ret;
367 }
368
369 static int cma_comp_exch(struct rdma_id_private *id_priv,
370 enum rdma_cm_state comp, enum rdma_cm_state exch)
371 {
372 unsigned long flags;
373 int ret;
374
375 spin_lock_irqsave(&id_priv->lock, flags);
376 if ((ret = (id_priv->state == comp)))
377 id_priv->state = exch;
378 spin_unlock_irqrestore(&id_priv->lock, flags);
379 return ret;
380 }
381
382 static enum rdma_cm_state cma_exch(struct rdma_id_private *id_priv,
383 enum rdma_cm_state exch)
384 {
385 unsigned long flags;
386 enum rdma_cm_state old;
387
388 spin_lock_irqsave(&id_priv->lock, flags);
389 old = id_priv->state;
390 id_priv->state = exch;
391 spin_unlock_irqrestore(&id_priv->lock, flags);
392 return old;
393 }
394
395 static inline u8 cma_get_ip_ver(const struct cma_hdr *hdr)
396 {
397 return hdr->ip_version >> 4;
398 }
399
400 static inline void cma_set_ip_ver(struct cma_hdr *hdr, u8 ip_ver)
401 {
402 hdr->ip_version = (ip_ver << 4) | (hdr->ip_version & 0xF);
403 }
404
405 static int cma_igmp_send(struct net_device *ndev, union ib_gid *mgid, bool join)
406 {
407 struct in_device *in_dev = NULL;
408
409 if (ndev) {
410 rtnl_lock();
411 in_dev = __in_dev_get_rtnl(ndev);
412 if (in_dev) {
413 if (join)
414 ip_mc_inc_group(in_dev,
415 *(__be32 *)(mgid->raw + 12));
416 else
417 ip_mc_dec_group(in_dev,
418 *(__be32 *)(mgid->raw + 12));
419 }
420 rtnl_unlock();
421 }
422 return (in_dev) ? 0 : -ENODEV;
423 }
424
425 static void _cma_attach_to_dev(struct rdma_id_private *id_priv,
426 struct cma_device *cma_dev)
427 {
428 cma_ref_dev(cma_dev);
429 id_priv->cma_dev = cma_dev;
430 id_priv->gid_type = 0;
431 id_priv->id.device = cma_dev->device;
432 id_priv->id.route.addr.dev_addr.transport =
433 rdma_node_get_transport(cma_dev->device->node_type);
434 list_add_tail(&id_priv->list, &cma_dev->id_list);
435 }
436
437 static void cma_attach_to_dev(struct rdma_id_private *id_priv,
438 struct cma_device *cma_dev)
439 {
440 _cma_attach_to_dev(id_priv, cma_dev);
441 id_priv->gid_type =
442 cma_dev->default_gid_type[id_priv->id.port_num -
443 rdma_start_port(cma_dev->device)];
444 }
445
446 void cma_deref_dev(struct cma_device *cma_dev)
447 {
448 if (atomic_dec_and_test(&cma_dev->refcount))
449 complete(&cma_dev->comp);
450 }
451
452 static inline void release_mc(struct kref *kref)
453 {
454 struct cma_multicast *mc = container_of(kref, struct cma_multicast, mcref);
455
456 kfree(mc->multicast.ib);
457 kfree(mc);
458 }
459
460 static void cma_release_dev(struct rdma_id_private *id_priv)
461 {
462 mutex_lock(&lock);
463 list_del(&id_priv->list);
464 cma_deref_dev(id_priv->cma_dev);
465 id_priv->cma_dev = NULL;
466 mutex_unlock(&lock);
467 }
468
469 static inline struct sockaddr *cma_src_addr(struct rdma_id_private *id_priv)
470 {
471 return (struct sockaddr *) &id_priv->id.route.addr.src_addr;
472 }
473
474 static inline struct sockaddr *cma_dst_addr(struct rdma_id_private *id_priv)
475 {
476 return (struct sockaddr *) &id_priv->id.route.addr.dst_addr;
477 }
478
479 static inline unsigned short cma_family(struct rdma_id_private *id_priv)
480 {
481 return id_priv->id.route.addr.src_addr.ss_family;
482 }
483
484 static int cma_set_qkey(struct rdma_id_private *id_priv, u32 qkey)
485 {
486 struct ib_sa_mcmember_rec rec;
487 int ret = 0;
488
489 if (id_priv->qkey) {
490 if (qkey && id_priv->qkey != qkey)
491 return -EINVAL;
492 return 0;
493 }
494
495 if (qkey) {
496 id_priv->qkey = qkey;
497 return 0;
498 }
499
500 switch (id_priv->id.ps) {
501 case RDMA_PS_UDP:
502 case RDMA_PS_IB:
503 id_priv->qkey = RDMA_UDP_QKEY;
504 break;
505 case RDMA_PS_IPOIB:
506 ib_addr_get_mgid(&id_priv->id.route.addr.dev_addr, &rec.mgid);
507 ret = ib_sa_get_mcmember_rec(id_priv->id.device,
508 id_priv->id.port_num, &rec.mgid,
509 &rec);
510 if (!ret)
511 id_priv->qkey = be32_to_cpu(rec.qkey);
512 break;
513 default:
514 break;
515 }
516 return ret;
517 }
518
519 static void cma_translate_ib(struct sockaddr_ib *sib, struct rdma_dev_addr *dev_addr)
520 {
521 dev_addr->dev_type = ARPHRD_INFINIBAND;
522 rdma_addr_set_sgid(dev_addr, (union ib_gid *) &sib->sib_addr);
523 ib_addr_set_pkey(dev_addr, ntohs(sib->sib_pkey));
524 }
525
526 static int cma_translate_addr(struct sockaddr *addr, struct rdma_dev_addr *dev_addr)
527 {
528 int ret;
529
530 if (addr->sa_family != AF_IB) {
531 ret = rdma_translate_ip(addr, dev_addr, NULL);
532 } else {
533 cma_translate_ib((struct sockaddr_ib *) addr, dev_addr);
534 ret = 0;
535 }
536
537 return ret;
538 }
539
540 static inline int cma_validate_port(struct ib_device *device, u8 port,
541 enum ib_gid_type gid_type,
542 union ib_gid *gid, int dev_type,
543 int bound_if_index)
544 {
545 int ret = -ENODEV;
546 struct net_device *ndev = NULL;
547
548 if ((dev_type == ARPHRD_INFINIBAND) && !rdma_protocol_ib(device, port))
549 return ret;
550
551 if ((dev_type != ARPHRD_INFINIBAND) && rdma_protocol_ib(device, port))
552 return ret;
553
554 if (dev_type == ARPHRD_ETHER && rdma_protocol_roce(device, port)) {
555 ndev = dev_get_by_index(&init_net, bound_if_index);
556 if (ndev && ndev->flags & IFF_LOOPBACK) {
557 pr_info("detected loopback device\n");
558 dev_put(ndev);
559
560 if (!device->get_netdev)
561 return -EOPNOTSUPP;
562
563 ndev = device->get_netdev(device, port);
564 if (!ndev)
565 return -ENODEV;
566 }
567 } else {
568 gid_type = IB_GID_TYPE_IB;
569 }
570
571 ret = ib_find_cached_gid_by_port(device, gid, gid_type, port,
572 ndev, NULL);
573
574 if (ndev)
575 dev_put(ndev);
576
577 return ret;
578 }
579
580 static int cma_acquire_dev(struct rdma_id_private *id_priv,
581 struct rdma_id_private *listen_id_priv)
582 {
583 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
584 struct cma_device *cma_dev;
585 union ib_gid gid, iboe_gid, *gidp;
586 int ret = -ENODEV;
587 u8 port;
588
589 if (dev_addr->dev_type != ARPHRD_INFINIBAND &&
590 id_priv->id.ps == RDMA_PS_IPOIB)
591 return -EINVAL;
592
593 mutex_lock(&lock);
594 rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
595 &iboe_gid);
596
597 memcpy(&gid, dev_addr->src_dev_addr +
598 rdma_addr_gid_offset(dev_addr), sizeof gid);
599
600 if (listen_id_priv) {
601 cma_dev = listen_id_priv->cma_dev;
602 port = listen_id_priv->id.port_num;
603 gidp = rdma_protocol_roce(cma_dev->device, port) ?
604 &iboe_gid : &gid;
605
606 ret = cma_validate_port(cma_dev->device, port,
607 rdma_protocol_ib(cma_dev->device, port) ?
608 IB_GID_TYPE_IB :
609 listen_id_priv->gid_type, gidp,
610 dev_addr->dev_type,
611 dev_addr->bound_dev_if);
612 if (!ret) {
613 id_priv->id.port_num = port;
614 goto out;
615 }
616 }
617
618 list_for_each_entry(cma_dev, &dev_list, list) {
619 for (port = 1; port <= cma_dev->device->phys_port_cnt; ++port) {
620 if (listen_id_priv &&
621 listen_id_priv->cma_dev == cma_dev &&
622 listen_id_priv->id.port_num == port)
623 continue;
624
625 gidp = rdma_protocol_roce(cma_dev->device, port) ?
626 &iboe_gid : &gid;
627
628 ret = cma_validate_port(cma_dev->device, port,
629 rdma_protocol_ib(cma_dev->device, port) ?
630 IB_GID_TYPE_IB :
631 cma_dev->default_gid_type[port - 1],
632 gidp, dev_addr->dev_type,
633 dev_addr->bound_dev_if);
634 if (!ret) {
635 id_priv->id.port_num = port;
636 goto out;
637 }
638 }
639 }
640
641 out:
642 if (!ret)
643 cma_attach_to_dev(id_priv, cma_dev);
644
645 mutex_unlock(&lock);
646 return ret;
647 }
648
649 /*
650 * Select the source IB device and address to reach the destination IB address.
651 */
652 static int cma_resolve_ib_dev(struct rdma_id_private *id_priv)
653 {
654 struct cma_device *cma_dev, *cur_dev;
655 struct sockaddr_ib *addr;
656 union ib_gid gid, sgid, *dgid;
657 u16 pkey, index;
658 u8 p;
659 int i;
660
661 cma_dev = NULL;
662 addr = (struct sockaddr_ib *) cma_dst_addr(id_priv);
663 dgid = (union ib_gid *) &addr->sib_addr;
664 pkey = ntohs(addr->sib_pkey);
665
666 list_for_each_entry(cur_dev, &dev_list, list) {
667 for (p = 1; p <= cur_dev->device->phys_port_cnt; ++p) {
668 if (!rdma_cap_af_ib(cur_dev->device, p))
669 continue;
670
671 if (ib_find_cached_pkey(cur_dev->device, p, pkey, &index))
672 continue;
673
674 for (i = 0; !ib_get_cached_gid(cur_dev->device, p, i,
675 &gid, NULL);
676 i++) {
677 if (!memcmp(&gid, dgid, sizeof(gid))) {
678 cma_dev = cur_dev;
679 sgid = gid;
680 id_priv->id.port_num = p;
681 goto found;
682 }
683
684 if (!cma_dev && (gid.global.subnet_prefix ==
685 dgid->global.subnet_prefix)) {
686 cma_dev = cur_dev;
687 sgid = gid;
688 id_priv->id.port_num = p;
689 }
690 }
691 }
692 }
693
694 if (!cma_dev)
695 return -ENODEV;
696
697 found:
698 cma_attach_to_dev(id_priv, cma_dev);
699 addr = (struct sockaddr_ib *) cma_src_addr(id_priv);
700 memcpy(&addr->sib_addr, &sgid, sizeof sgid);
701 cma_translate_ib(addr, &id_priv->id.route.addr.dev_addr);
702 return 0;
703 }
704
705 static void cma_deref_id(struct rdma_id_private *id_priv)
706 {
707 if (atomic_dec_and_test(&id_priv->refcount))
708 complete(&id_priv->comp);
709 }
710
711 struct rdma_cm_id *rdma_create_id(struct net *net,
712 rdma_cm_event_handler event_handler,
713 void *context, enum rdma_port_space ps,
714 enum ib_qp_type qp_type)
715 {
716 struct rdma_id_private *id_priv;
717
718 id_priv = kzalloc(sizeof *id_priv, GFP_KERNEL);
719 if (!id_priv)
720 return ERR_PTR(-ENOMEM);
721
722 id_priv->owner = task_pid_nr(current);
723 id_priv->state = RDMA_CM_IDLE;
724 id_priv->id.context = context;
725 id_priv->id.event_handler = event_handler;
726 id_priv->id.ps = ps;
727 id_priv->id.qp_type = qp_type;
728 spin_lock_init(&id_priv->lock);
729 mutex_init(&id_priv->qp_mutex);
730 init_completion(&id_priv->comp);
731 atomic_set(&id_priv->refcount, 1);
732 mutex_init(&id_priv->handler_mutex);
733 INIT_LIST_HEAD(&id_priv->listen_list);
734 INIT_LIST_HEAD(&id_priv->mc_list);
735 get_random_bytes(&id_priv->seq_num, sizeof id_priv->seq_num);
736 id_priv->id.route.addr.dev_addr.net = get_net(net);
737
738 return &id_priv->id;
739 }
740 EXPORT_SYMBOL(rdma_create_id);
741
742 static int cma_init_ud_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
743 {
744 struct ib_qp_attr qp_attr;
745 int qp_attr_mask, ret;
746
747 qp_attr.qp_state = IB_QPS_INIT;
748 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
749 if (ret)
750 return ret;
751
752 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
753 if (ret)
754 return ret;
755
756 qp_attr.qp_state = IB_QPS_RTR;
757 ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE);
758 if (ret)
759 return ret;
760
761 qp_attr.qp_state = IB_QPS_RTS;
762 qp_attr.sq_psn = 0;
763 ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE | IB_QP_SQ_PSN);
764
765 return ret;
766 }
767
768 static int cma_init_conn_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
769 {
770 struct ib_qp_attr qp_attr;
771 int qp_attr_mask, ret;
772
773 qp_attr.qp_state = IB_QPS_INIT;
774 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
775 if (ret)
776 return ret;
777
778 return ib_modify_qp(qp, &qp_attr, qp_attr_mask);
779 }
780
781 int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd,
782 struct ib_qp_init_attr *qp_init_attr)
783 {
784 struct rdma_id_private *id_priv;
785 struct ib_qp *qp;
786 int ret;
787
788 id_priv = container_of(id, struct rdma_id_private, id);
789 if (id->device != pd->device)
790 return -EINVAL;
791
792 qp_init_attr->port_num = id->port_num;
793 qp = ib_create_qp(pd, qp_init_attr);
794 if (IS_ERR(qp))
795 return PTR_ERR(qp);
796
797 if (id->qp_type == IB_QPT_UD)
798 ret = cma_init_ud_qp(id_priv, qp);
799 else
800 ret = cma_init_conn_qp(id_priv, qp);
801 if (ret)
802 goto err;
803
804 id->qp = qp;
805 id_priv->qp_num = qp->qp_num;
806 id_priv->srq = (qp->srq != NULL);
807 return 0;
808 err:
809 ib_destroy_qp(qp);
810 return ret;
811 }
812 EXPORT_SYMBOL(rdma_create_qp);
813
814 void rdma_destroy_qp(struct rdma_cm_id *id)
815 {
816 struct rdma_id_private *id_priv;
817
818 id_priv = container_of(id, struct rdma_id_private, id);
819 mutex_lock(&id_priv->qp_mutex);
820 ib_destroy_qp(id_priv->id.qp);
821 id_priv->id.qp = NULL;
822 mutex_unlock(&id_priv->qp_mutex);
823 }
824 EXPORT_SYMBOL(rdma_destroy_qp);
825
826 static int cma_modify_qp_rtr(struct rdma_id_private *id_priv,
827 struct rdma_conn_param *conn_param)
828 {
829 struct ib_qp_attr qp_attr;
830 int qp_attr_mask, ret;
831 union ib_gid sgid;
832
833 mutex_lock(&id_priv->qp_mutex);
834 if (!id_priv->id.qp) {
835 ret = 0;
836 goto out;
837 }
838
839 /* Need to update QP attributes from default values. */
840 qp_attr.qp_state = IB_QPS_INIT;
841 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
842 if (ret)
843 goto out;
844
845 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
846 if (ret)
847 goto out;
848
849 qp_attr.qp_state = IB_QPS_RTR;
850 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
851 if (ret)
852 goto out;
853
854 ret = ib_query_gid(id_priv->id.device, id_priv->id.port_num,
855 qp_attr.ah_attr.grh.sgid_index, &sgid, NULL);
856 if (ret)
857 goto out;
858
859 BUG_ON(id_priv->cma_dev->device != id_priv->id.device);
860
861 if (conn_param)
862 qp_attr.max_dest_rd_atomic = conn_param->responder_resources;
863 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
864 out:
865 mutex_unlock(&id_priv->qp_mutex);
866 return ret;
867 }
868
869 static int cma_modify_qp_rts(struct rdma_id_private *id_priv,
870 struct rdma_conn_param *conn_param)
871 {
872 struct ib_qp_attr qp_attr;
873 int qp_attr_mask, ret;
874
875 mutex_lock(&id_priv->qp_mutex);
876 if (!id_priv->id.qp) {
877 ret = 0;
878 goto out;
879 }
880
881 qp_attr.qp_state = IB_QPS_RTS;
882 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
883 if (ret)
884 goto out;
885
886 if (conn_param)
887 qp_attr.max_rd_atomic = conn_param->initiator_depth;
888 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
889 out:
890 mutex_unlock(&id_priv->qp_mutex);
891 return ret;
892 }
893
894 static int cma_modify_qp_err(struct rdma_id_private *id_priv)
895 {
896 struct ib_qp_attr qp_attr;
897 int ret;
898
899 mutex_lock(&id_priv->qp_mutex);
900 if (!id_priv->id.qp) {
901 ret = 0;
902 goto out;
903 }
904
905 qp_attr.qp_state = IB_QPS_ERR;
906 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, IB_QP_STATE);
907 out:
908 mutex_unlock(&id_priv->qp_mutex);
909 return ret;
910 }
911
912 static int cma_ib_init_qp_attr(struct rdma_id_private *id_priv,
913 struct ib_qp_attr *qp_attr, int *qp_attr_mask)
914 {
915 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
916 int ret;
917 u16 pkey;
918
919 if (rdma_cap_eth_ah(id_priv->id.device, id_priv->id.port_num))
920 pkey = 0xffff;
921 else
922 pkey = ib_addr_get_pkey(dev_addr);
923
924 ret = ib_find_cached_pkey(id_priv->id.device, id_priv->id.port_num,
925 pkey, &qp_attr->pkey_index);
926 if (ret)
927 return ret;
928
929 qp_attr->port_num = id_priv->id.port_num;
930 *qp_attr_mask = IB_QP_STATE | IB_QP_PKEY_INDEX | IB_QP_PORT;
931
932 if (id_priv->id.qp_type == IB_QPT_UD) {
933 ret = cma_set_qkey(id_priv, 0);
934 if (ret)
935 return ret;
936
937 qp_attr->qkey = id_priv->qkey;
938 *qp_attr_mask |= IB_QP_QKEY;
939 } else {
940 qp_attr->qp_access_flags = 0;
941 *qp_attr_mask |= IB_QP_ACCESS_FLAGS;
942 }
943 return 0;
944 }
945
946 int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
947 int *qp_attr_mask)
948 {
949 struct rdma_id_private *id_priv;
950 int ret = 0;
951
952 id_priv = container_of(id, struct rdma_id_private, id);
953 if (rdma_cap_ib_cm(id->device, id->port_num)) {
954 if (!id_priv->cm_id.ib || (id_priv->id.qp_type == IB_QPT_UD))
955 ret = cma_ib_init_qp_attr(id_priv, qp_attr, qp_attr_mask);
956 else
957 ret = ib_cm_init_qp_attr(id_priv->cm_id.ib, qp_attr,
958 qp_attr_mask);
959
960 if (qp_attr->qp_state == IB_QPS_RTR)
961 qp_attr->rq_psn = id_priv->seq_num;
962 } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
963 if (!id_priv->cm_id.iw) {
964 qp_attr->qp_access_flags = 0;
965 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS;
966 } else
967 ret = iw_cm_init_qp_attr(id_priv->cm_id.iw, qp_attr,
968 qp_attr_mask);
969 } else
970 ret = -ENOSYS;
971
972 return ret;
973 }
974 EXPORT_SYMBOL(rdma_init_qp_attr);
975
976 static inline int cma_zero_addr(struct sockaddr *addr)
977 {
978 switch (addr->sa_family) {
979 case AF_INET:
980 return ipv4_is_zeronet(((struct sockaddr_in *)addr)->sin_addr.s_addr);
981 case AF_INET6:
982 return ipv6_addr_any(&((struct sockaddr_in6 *) addr)->sin6_addr);
983 case AF_IB:
984 return ib_addr_any(&((struct sockaddr_ib *) addr)->sib_addr);
985 default:
986 return 0;
987 }
988 }
989
990 static inline int cma_loopback_addr(struct sockaddr *addr)
991 {
992 switch (addr->sa_family) {
993 case AF_INET:
994 return ipv4_is_loopback(((struct sockaddr_in *) addr)->sin_addr.s_addr);
995 case AF_INET6:
996 return ipv6_addr_loopback(&((struct sockaddr_in6 *) addr)->sin6_addr);
997 case AF_IB:
998 return ib_addr_loopback(&((struct sockaddr_ib *) addr)->sib_addr);
999 default:
1000 return 0;
1001 }
1002 }
1003
1004 static inline int cma_any_addr(struct sockaddr *addr)
1005 {
1006 return cma_zero_addr(addr) || cma_loopback_addr(addr);
1007 }
1008
1009 static int cma_addr_cmp(struct sockaddr *src, struct sockaddr *dst)
1010 {
1011 if (src->sa_family != dst->sa_family)
1012 return -1;
1013
1014 switch (src->sa_family) {
1015 case AF_INET:
1016 return ((struct sockaddr_in *) src)->sin_addr.s_addr !=
1017 ((struct sockaddr_in *) dst)->sin_addr.s_addr;
1018 case AF_INET6:
1019 return ipv6_addr_cmp(&((struct sockaddr_in6 *) src)->sin6_addr,
1020 &((struct sockaddr_in6 *) dst)->sin6_addr);
1021 default:
1022 return ib_addr_cmp(&((struct sockaddr_ib *) src)->sib_addr,
1023 &((struct sockaddr_ib *) dst)->sib_addr);
1024 }
1025 }
1026
1027 static __be16 cma_port(struct sockaddr *addr)
1028 {
1029 struct sockaddr_ib *sib;
1030
1031 switch (addr->sa_family) {
1032 case AF_INET:
1033 return ((struct sockaddr_in *) addr)->sin_port;
1034 case AF_INET6:
1035 return ((struct sockaddr_in6 *) addr)->sin6_port;
1036 case AF_IB:
1037 sib = (struct sockaddr_ib *) addr;
1038 return htons((u16) (be64_to_cpu(sib->sib_sid) &
1039 be64_to_cpu(sib->sib_sid_mask)));
1040 default:
1041 return 0;
1042 }
1043 }
1044
1045 static inline int cma_any_port(struct sockaddr *addr)
1046 {
1047 return !cma_port(addr);
1048 }
1049
1050 static void cma_save_ib_info(struct sockaddr *src_addr,
1051 struct sockaddr *dst_addr,
1052 struct rdma_cm_id *listen_id,
1053 struct ib_sa_path_rec *path)
1054 {
1055 struct sockaddr_ib *listen_ib, *ib;
1056
1057 listen_ib = (struct sockaddr_ib *) &listen_id->route.addr.src_addr;
1058 if (src_addr) {
1059 ib = (struct sockaddr_ib *)src_addr;
1060 ib->sib_family = AF_IB;
1061 if (path) {
1062 ib->sib_pkey = path->pkey;
1063 ib->sib_flowinfo = path->flow_label;
1064 memcpy(&ib->sib_addr, &path->sgid, 16);
1065 ib->sib_sid = path->service_id;
1066 ib->sib_scope_id = 0;
1067 } else {
1068 ib->sib_pkey = listen_ib->sib_pkey;
1069 ib->sib_flowinfo = listen_ib->sib_flowinfo;
1070 ib->sib_addr = listen_ib->sib_addr;
1071 ib->sib_sid = listen_ib->sib_sid;
1072 ib->sib_scope_id = listen_ib->sib_scope_id;
1073 }
1074 ib->sib_sid_mask = cpu_to_be64(0xffffffffffffffffULL);
1075 }
1076 if (dst_addr) {
1077 ib = (struct sockaddr_ib *)dst_addr;
1078 ib->sib_family = AF_IB;
1079 if (path) {
1080 ib->sib_pkey = path->pkey;
1081 ib->sib_flowinfo = path->flow_label;
1082 memcpy(&ib->sib_addr, &path->dgid, 16);
1083 }
1084 }
1085 }
1086
1087 static void cma_save_ip4_info(struct sockaddr *src_addr,
1088 struct sockaddr *dst_addr,
1089 struct cma_hdr *hdr,
1090 __be16 local_port)
1091 {
1092 struct sockaddr_in *ip4;
1093
1094 if (src_addr) {
1095 ip4 = (struct sockaddr_in *)src_addr;
1096 ip4->sin_family = AF_INET;
1097 ip4->sin_addr.s_addr = hdr->dst_addr.ip4.addr;
1098 ip4->sin_port = local_port;
1099 }
1100
1101 if (dst_addr) {
1102 ip4 = (struct sockaddr_in *)dst_addr;
1103 ip4->sin_family = AF_INET;
1104 ip4->sin_addr.s_addr = hdr->src_addr.ip4.addr;
1105 ip4->sin_port = hdr->port;
1106 }
1107 }
1108
1109 static void cma_save_ip6_info(struct sockaddr *src_addr,
1110 struct sockaddr *dst_addr,
1111 struct cma_hdr *hdr,
1112 __be16 local_port)
1113 {
1114 struct sockaddr_in6 *ip6;
1115
1116 if (src_addr) {
1117 ip6 = (struct sockaddr_in6 *)src_addr;
1118 ip6->sin6_family = AF_INET6;
1119 ip6->sin6_addr = hdr->dst_addr.ip6;
1120 ip6->sin6_port = local_port;
1121 }
1122
1123 if (dst_addr) {
1124 ip6 = (struct sockaddr_in6 *)dst_addr;
1125 ip6->sin6_family = AF_INET6;
1126 ip6->sin6_addr = hdr->src_addr.ip6;
1127 ip6->sin6_port = hdr->port;
1128 }
1129 }
1130
1131 static u16 cma_port_from_service_id(__be64 service_id)
1132 {
1133 return (u16)be64_to_cpu(service_id);
1134 }
1135
1136 static int cma_save_ip_info(struct sockaddr *src_addr,
1137 struct sockaddr *dst_addr,
1138 struct ib_cm_event *ib_event,
1139 __be64 service_id)
1140 {
1141 struct cma_hdr *hdr;
1142 __be16 port;
1143
1144 hdr = ib_event->private_data;
1145 if (hdr->cma_version != CMA_VERSION)
1146 return -EINVAL;
1147
1148 port = htons(cma_port_from_service_id(service_id));
1149
1150 switch (cma_get_ip_ver(hdr)) {
1151 case 4:
1152 cma_save_ip4_info(src_addr, dst_addr, hdr, port);
1153 break;
1154 case 6:
1155 cma_save_ip6_info(src_addr, dst_addr, hdr, port);
1156 break;
1157 default:
1158 return -EAFNOSUPPORT;
1159 }
1160
1161 return 0;
1162 }
1163
1164 static int cma_save_net_info(struct sockaddr *src_addr,
1165 struct sockaddr *dst_addr,
1166 struct rdma_cm_id *listen_id,
1167 struct ib_cm_event *ib_event,
1168 sa_family_t sa_family, __be64 service_id)
1169 {
1170 if (sa_family == AF_IB) {
1171 if (ib_event->event == IB_CM_REQ_RECEIVED)
1172 cma_save_ib_info(src_addr, dst_addr, listen_id,
1173 ib_event->param.req_rcvd.primary_path);
1174 else if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED)
1175 cma_save_ib_info(src_addr, dst_addr, listen_id, NULL);
1176 return 0;
1177 }
1178
1179 return cma_save_ip_info(src_addr, dst_addr, ib_event, service_id);
1180 }
1181
1182 static int cma_save_req_info(const struct ib_cm_event *ib_event,
1183 struct cma_req_info *req)
1184 {
1185 const struct ib_cm_req_event_param *req_param =
1186 &ib_event->param.req_rcvd;
1187 const struct ib_cm_sidr_req_event_param *sidr_param =
1188 &ib_event->param.sidr_req_rcvd;
1189
1190 switch (ib_event->event) {
1191 case IB_CM_REQ_RECEIVED:
1192 req->device = req_param->listen_id->device;
1193 req->port = req_param->port;
1194 memcpy(&req->local_gid, &req_param->primary_path->sgid,
1195 sizeof(req->local_gid));
1196 req->has_gid = true;
1197 req->service_id = req_param->primary_path->service_id;
1198 req->pkey = be16_to_cpu(req_param->primary_path->pkey);
1199 if (req->pkey != req_param->bth_pkey)
1200 pr_warn_ratelimited("RDMA CMA: got different BTH P_Key (0x%x) and primary path P_Key (0x%x)\n"
1201 "RDMA CMA: in the future this may cause the request to be dropped\n",
1202 req_param->bth_pkey, req->pkey);
1203 break;
1204 case IB_CM_SIDR_REQ_RECEIVED:
1205 req->device = sidr_param->listen_id->device;
1206 req->port = sidr_param->port;
1207 req->has_gid = false;
1208 req->service_id = sidr_param->service_id;
1209 req->pkey = sidr_param->pkey;
1210 if (req->pkey != sidr_param->bth_pkey)
1211 pr_warn_ratelimited("RDMA CMA: got different BTH P_Key (0x%x) and SIDR request payload P_Key (0x%x)\n"
1212 "RDMA CMA: in the future this may cause the request to be dropped\n",
1213 sidr_param->bth_pkey, req->pkey);
1214 break;
1215 default:
1216 return -EINVAL;
1217 }
1218
1219 return 0;
1220 }
1221
1222 static bool validate_ipv4_net_dev(struct net_device *net_dev,
1223 const struct sockaddr_in *dst_addr,
1224 const struct sockaddr_in *src_addr)
1225 {
1226 __be32 daddr = dst_addr->sin_addr.s_addr,
1227 saddr = src_addr->sin_addr.s_addr;
1228 struct fib_result res;
1229 struct flowi4 fl4;
1230 int err;
1231 bool ret;
1232
1233 if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) ||
1234 ipv4_is_lbcast(daddr) || ipv4_is_zeronet(saddr) ||
1235 ipv4_is_zeronet(daddr) || ipv4_is_loopback(daddr) ||
1236 ipv4_is_loopback(saddr))
1237 return false;
1238
1239 memset(&fl4, 0, sizeof(fl4));
1240 fl4.flowi4_iif = net_dev->ifindex;
1241 fl4.daddr = daddr;
1242 fl4.saddr = saddr;
1243
1244 rcu_read_lock();
1245 err = fib_lookup(dev_net(net_dev), &fl4, &res, 0);
1246 ret = err == 0 && FIB_RES_DEV(res) == net_dev;
1247 rcu_read_unlock();
1248
1249 return ret;
1250 }
1251
1252 static bool validate_ipv6_net_dev(struct net_device *net_dev,
1253 const struct sockaddr_in6 *dst_addr,
1254 const struct sockaddr_in6 *src_addr)
1255 {
1256 #if IS_ENABLED(CONFIG_IPV6)
1257 const int strict = ipv6_addr_type(&dst_addr->sin6_addr) &
1258 IPV6_ADDR_LINKLOCAL;
1259 struct rt6_info *rt = rt6_lookup(dev_net(net_dev), &dst_addr->sin6_addr,
1260 &src_addr->sin6_addr, net_dev->ifindex,
1261 strict);
1262 bool ret;
1263
1264 if (!rt)
1265 return false;
1266
1267 ret = rt->rt6i_idev->dev == net_dev;
1268 ip6_rt_put(rt);
1269
1270 return ret;
1271 #else
1272 return false;
1273 #endif
1274 }
1275
1276 static bool validate_net_dev(struct net_device *net_dev,
1277 const struct sockaddr *daddr,
1278 const struct sockaddr *saddr)
1279 {
1280 const struct sockaddr_in *daddr4 = (const struct sockaddr_in *)daddr;
1281 const struct sockaddr_in *saddr4 = (const struct sockaddr_in *)saddr;
1282 const struct sockaddr_in6 *daddr6 = (const struct sockaddr_in6 *)daddr;
1283 const struct sockaddr_in6 *saddr6 = (const struct sockaddr_in6 *)saddr;
1284
1285 switch (daddr->sa_family) {
1286 case AF_INET:
1287 return saddr->sa_family == AF_INET &&
1288 validate_ipv4_net_dev(net_dev, daddr4, saddr4);
1289
1290 case AF_INET6:
1291 return saddr->sa_family == AF_INET6 &&
1292 validate_ipv6_net_dev(net_dev, daddr6, saddr6);
1293
1294 default:
1295 return false;
1296 }
1297 }
1298
1299 static struct net_device *cma_get_net_dev(struct ib_cm_event *ib_event,
1300 const struct cma_req_info *req)
1301 {
1302 struct sockaddr_storage listen_addr_storage, src_addr_storage;
1303 struct sockaddr *listen_addr = (struct sockaddr *)&listen_addr_storage,
1304 *src_addr = (struct sockaddr *)&src_addr_storage;
1305 struct net_device *net_dev;
1306 const union ib_gid *gid = req->has_gid ? &req->local_gid : NULL;
1307 int err;
1308
1309 err = cma_save_ip_info(listen_addr, src_addr, ib_event,
1310 req->service_id);
1311 if (err)
1312 return ERR_PTR(err);
1313
1314 net_dev = ib_get_net_dev_by_params(req->device, req->port, req->pkey,
1315 gid, listen_addr);
1316 if (!net_dev)
1317 return ERR_PTR(-ENODEV);
1318
1319 if (!validate_net_dev(net_dev, listen_addr, src_addr)) {
1320 dev_put(net_dev);
1321 return ERR_PTR(-EHOSTUNREACH);
1322 }
1323
1324 return net_dev;
1325 }
1326
1327 static enum rdma_port_space rdma_ps_from_service_id(__be64 service_id)
1328 {
1329 return (be64_to_cpu(service_id) >> 16) & 0xffff;
1330 }
1331
1332 static bool cma_match_private_data(struct rdma_id_private *id_priv,
1333 const struct cma_hdr *hdr)
1334 {
1335 struct sockaddr *addr = cma_src_addr(id_priv);
1336 __be32 ip4_addr;
1337 struct in6_addr ip6_addr;
1338
1339 if (cma_any_addr(addr) && !id_priv->afonly)
1340 return true;
1341
1342 switch (addr->sa_family) {
1343 case AF_INET:
1344 ip4_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
1345 if (cma_get_ip_ver(hdr) != 4)
1346 return false;
1347 if (!cma_any_addr(addr) &&
1348 hdr->dst_addr.ip4.addr != ip4_addr)
1349 return false;
1350 break;
1351 case AF_INET6:
1352 ip6_addr = ((struct sockaddr_in6 *)addr)->sin6_addr;
1353 if (cma_get_ip_ver(hdr) != 6)
1354 return false;
1355 if (!cma_any_addr(addr) &&
1356 memcmp(&hdr->dst_addr.ip6, &ip6_addr, sizeof(ip6_addr)))
1357 return false;
1358 break;
1359 case AF_IB:
1360 return true;
1361 default:
1362 return false;
1363 }
1364
1365 return true;
1366 }
1367
1368 static bool cma_protocol_roce_dev_port(struct ib_device *device, int port_num)
1369 {
1370 enum rdma_link_layer ll = rdma_port_get_link_layer(device, port_num);
1371 enum rdma_transport_type transport =
1372 rdma_node_get_transport(device->node_type);
1373
1374 return ll == IB_LINK_LAYER_ETHERNET && transport == RDMA_TRANSPORT_IB;
1375 }
1376
1377 static bool cma_protocol_roce(const struct rdma_cm_id *id)
1378 {
1379 struct ib_device *device = id->device;
1380 const int port_num = id->port_num ?: rdma_start_port(device);
1381
1382 return cma_protocol_roce_dev_port(device, port_num);
1383 }
1384
1385 static bool cma_match_net_dev(const struct rdma_cm_id *id,
1386 const struct net_device *net_dev,
1387 u8 port_num)
1388 {
1389 const struct rdma_addr *addr = &id->route.addr;
1390
1391 if (!net_dev)
1392 /* This request is an AF_IB request or a RoCE request */
1393 return (!id->port_num || id->port_num == port_num) &&
1394 (addr->src_addr.ss_family == AF_IB ||
1395 cma_protocol_roce_dev_port(id->device, port_num));
1396
1397 return !addr->dev_addr.bound_dev_if ||
1398 (net_eq(dev_net(net_dev), addr->dev_addr.net) &&
1399 addr->dev_addr.bound_dev_if == net_dev->ifindex);
1400 }
1401
1402 static struct rdma_id_private *cma_find_listener(
1403 const struct rdma_bind_list *bind_list,
1404 const struct ib_cm_id *cm_id,
1405 const struct ib_cm_event *ib_event,
1406 const struct cma_req_info *req,
1407 const struct net_device *net_dev)
1408 {
1409 struct rdma_id_private *id_priv, *id_priv_dev;
1410
1411 if (!bind_list)
1412 return ERR_PTR(-EINVAL);
1413
1414 hlist_for_each_entry(id_priv, &bind_list->owners, node) {
1415 if (cma_match_private_data(id_priv, ib_event->private_data)) {
1416 if (id_priv->id.device == cm_id->device &&
1417 cma_match_net_dev(&id_priv->id, net_dev, req->port))
1418 return id_priv;
1419 list_for_each_entry(id_priv_dev,
1420 &id_priv->listen_list,
1421 listen_list) {
1422 if (id_priv_dev->id.device == cm_id->device &&
1423 cma_match_net_dev(&id_priv_dev->id, net_dev, req->port))
1424 return id_priv_dev;
1425 }
1426 }
1427 }
1428
1429 return ERR_PTR(-EINVAL);
1430 }
1431
1432 static struct rdma_id_private *cma_id_from_event(struct ib_cm_id *cm_id,
1433 struct ib_cm_event *ib_event,
1434 struct net_device **net_dev)
1435 {
1436 struct cma_req_info req;
1437 struct rdma_bind_list *bind_list;
1438 struct rdma_id_private *id_priv;
1439 int err;
1440
1441 err = cma_save_req_info(ib_event, &req);
1442 if (err)
1443 return ERR_PTR(err);
1444
1445 *net_dev = cma_get_net_dev(ib_event, &req);
1446 if (IS_ERR(*net_dev)) {
1447 if (PTR_ERR(*net_dev) == -EAFNOSUPPORT) {
1448 /* Assuming the protocol is AF_IB */
1449 *net_dev = NULL;
1450 } else if (cma_protocol_roce_dev_port(req.device, req.port)) {
1451 /* TODO find the net dev matching the request parameters
1452 * through the RoCE GID table */
1453 *net_dev = NULL;
1454 } else {
1455 return ERR_CAST(*net_dev);
1456 }
1457 }
1458
1459 bind_list = cma_ps_find(*net_dev ? dev_net(*net_dev) : &init_net,
1460 rdma_ps_from_service_id(req.service_id),
1461 cma_port_from_service_id(req.service_id));
1462 id_priv = cma_find_listener(bind_list, cm_id, ib_event, &req, *net_dev);
1463 if (IS_ERR(id_priv) && *net_dev) {
1464 dev_put(*net_dev);
1465 *net_dev = NULL;
1466 }
1467
1468 return id_priv;
1469 }
1470
1471 static inline int cma_user_data_offset(struct rdma_id_private *id_priv)
1472 {
1473 return cma_family(id_priv) == AF_IB ? 0 : sizeof(struct cma_hdr);
1474 }
1475
1476 static void cma_cancel_route(struct rdma_id_private *id_priv)
1477 {
1478 if (rdma_cap_ib_sa(id_priv->id.device, id_priv->id.port_num)) {
1479 if (id_priv->query)
1480 ib_sa_cancel_query(id_priv->query_id, id_priv->query);
1481 }
1482 }
1483
1484 static void cma_cancel_listens(struct rdma_id_private *id_priv)
1485 {
1486 struct rdma_id_private *dev_id_priv;
1487
1488 /*
1489 * Remove from listen_any_list to prevent added devices from spawning
1490 * additional listen requests.
1491 */
1492 mutex_lock(&lock);
1493 list_del(&id_priv->list);
1494
1495 while (!list_empty(&id_priv->listen_list)) {
1496 dev_id_priv = list_entry(id_priv->listen_list.next,
1497 struct rdma_id_private, listen_list);
1498 /* sync with device removal to avoid duplicate destruction */
1499 list_del_init(&dev_id_priv->list);
1500 list_del(&dev_id_priv->listen_list);
1501 mutex_unlock(&lock);
1502
1503 rdma_destroy_id(&dev_id_priv->id);
1504 mutex_lock(&lock);
1505 }
1506 mutex_unlock(&lock);
1507 }
1508
1509 static void cma_cancel_operation(struct rdma_id_private *id_priv,
1510 enum rdma_cm_state state)
1511 {
1512 switch (state) {
1513 case RDMA_CM_ADDR_QUERY:
1514 rdma_addr_cancel(&id_priv->id.route.addr.dev_addr);
1515 break;
1516 case RDMA_CM_ROUTE_QUERY:
1517 cma_cancel_route(id_priv);
1518 break;
1519 case RDMA_CM_LISTEN:
1520 if (cma_any_addr(cma_src_addr(id_priv)) && !id_priv->cma_dev)
1521 cma_cancel_listens(id_priv);
1522 break;
1523 default:
1524 break;
1525 }
1526 }
1527
1528 static void cma_release_port(struct rdma_id_private *id_priv)
1529 {
1530 struct rdma_bind_list *bind_list = id_priv->bind_list;
1531 struct net *net = id_priv->id.route.addr.dev_addr.net;
1532
1533 if (!bind_list)
1534 return;
1535
1536 mutex_lock(&lock);
1537 hlist_del(&id_priv->node);
1538 if (hlist_empty(&bind_list->owners)) {
1539 cma_ps_remove(net, bind_list->ps, bind_list->port);
1540 kfree(bind_list);
1541 }
1542 mutex_unlock(&lock);
1543 }
1544
1545 static void cma_leave_mc_groups(struct rdma_id_private *id_priv)
1546 {
1547 struct cma_multicast *mc;
1548
1549 while (!list_empty(&id_priv->mc_list)) {
1550 mc = container_of(id_priv->mc_list.next,
1551 struct cma_multicast, list);
1552 list_del(&mc->list);
1553 if (rdma_cap_ib_mcast(id_priv->cma_dev->device,
1554 id_priv->id.port_num)) {
1555 ib_sa_free_multicast(mc->multicast.ib);
1556 kfree(mc);
1557 } else {
1558 if (mc->igmp_joined) {
1559 struct rdma_dev_addr *dev_addr =
1560 &id_priv->id.route.addr.dev_addr;
1561 struct net_device *ndev = NULL;
1562
1563 if (dev_addr->bound_dev_if)
1564 ndev = dev_get_by_index(&init_net,
1565 dev_addr->bound_dev_if);
1566 if (ndev) {
1567 cma_igmp_send(ndev,
1568 &mc->multicast.ib->rec.mgid,
1569 false);
1570 dev_put(ndev);
1571 }
1572 }
1573 kref_put(&mc->mcref, release_mc);
1574 }
1575 }
1576 }
1577
1578 void rdma_destroy_id(struct rdma_cm_id *id)
1579 {
1580 struct rdma_id_private *id_priv;
1581 enum rdma_cm_state state;
1582
1583 id_priv = container_of(id, struct rdma_id_private, id);
1584 state = cma_exch(id_priv, RDMA_CM_DESTROYING);
1585 cma_cancel_operation(id_priv, state);
1586
1587 /*
1588 * Wait for any active callback to finish. New callbacks will find
1589 * the id_priv state set to destroying and abort.
1590 */
1591 mutex_lock(&id_priv->handler_mutex);
1592 mutex_unlock(&id_priv->handler_mutex);
1593
1594 if (id_priv->cma_dev) {
1595 if (rdma_cap_ib_cm(id_priv->id.device, 1)) {
1596 if (id_priv->cm_id.ib)
1597 ib_destroy_cm_id(id_priv->cm_id.ib);
1598 } else if (rdma_cap_iw_cm(id_priv->id.device, 1)) {
1599 if (id_priv->cm_id.iw)
1600 iw_destroy_cm_id(id_priv->cm_id.iw);
1601 }
1602 cma_leave_mc_groups(id_priv);
1603 cma_release_dev(id_priv);
1604 }
1605
1606 cma_release_port(id_priv);
1607 cma_deref_id(id_priv);
1608 wait_for_completion(&id_priv->comp);
1609
1610 if (id_priv->internal_id)
1611 cma_deref_id(id_priv->id.context);
1612
1613 kfree(id_priv->id.route.path_rec);
1614 put_net(id_priv->id.route.addr.dev_addr.net);
1615 kfree(id_priv);
1616 }
1617 EXPORT_SYMBOL(rdma_destroy_id);
1618
1619 static int cma_rep_recv(struct rdma_id_private *id_priv)
1620 {
1621 int ret;
1622
1623 ret = cma_modify_qp_rtr(id_priv, NULL);
1624 if (ret)
1625 goto reject;
1626
1627 ret = cma_modify_qp_rts(id_priv, NULL);
1628 if (ret)
1629 goto reject;
1630
1631 ret = ib_send_cm_rtu(id_priv->cm_id.ib, NULL, 0);
1632 if (ret)
1633 goto reject;
1634
1635 return 0;
1636 reject:
1637 cma_modify_qp_err(id_priv);
1638 ib_send_cm_rej(id_priv->cm_id.ib, IB_CM_REJ_CONSUMER_DEFINED,
1639 NULL, 0, NULL, 0);
1640 return ret;
1641 }
1642
1643 static void cma_set_rep_event_data(struct rdma_cm_event *event,
1644 struct ib_cm_rep_event_param *rep_data,
1645 void *private_data)
1646 {
1647 event->param.conn.private_data = private_data;
1648 event->param.conn.private_data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
1649 event->param.conn.responder_resources = rep_data->responder_resources;
1650 event->param.conn.initiator_depth = rep_data->initiator_depth;
1651 event->param.conn.flow_control = rep_data->flow_control;
1652 event->param.conn.rnr_retry_count = rep_data->rnr_retry_count;
1653 event->param.conn.srq = rep_data->srq;
1654 event->param.conn.qp_num = rep_data->remote_qpn;
1655 }
1656
1657 static int cma_ib_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
1658 {
1659 struct rdma_id_private *id_priv = cm_id->context;
1660 struct rdma_cm_event event;
1661 int ret = 0;
1662
1663 mutex_lock(&id_priv->handler_mutex);
1664 if ((ib_event->event != IB_CM_TIMEWAIT_EXIT &&
1665 id_priv->state != RDMA_CM_CONNECT) ||
1666 (ib_event->event == IB_CM_TIMEWAIT_EXIT &&
1667 id_priv->state != RDMA_CM_DISCONNECT))
1668 goto out;
1669
1670 memset(&event, 0, sizeof event);
1671 switch (ib_event->event) {
1672 case IB_CM_REQ_ERROR:
1673 case IB_CM_REP_ERROR:
1674 event.event = RDMA_CM_EVENT_UNREACHABLE;
1675 event.status = -ETIMEDOUT;
1676 break;
1677 case IB_CM_REP_RECEIVED:
1678 if (id_priv->id.qp) {
1679 event.status = cma_rep_recv(id_priv);
1680 event.event = event.status ? RDMA_CM_EVENT_CONNECT_ERROR :
1681 RDMA_CM_EVENT_ESTABLISHED;
1682 } else {
1683 event.event = RDMA_CM_EVENT_CONNECT_RESPONSE;
1684 }
1685 cma_set_rep_event_data(&event, &ib_event->param.rep_rcvd,
1686 ib_event->private_data);
1687 break;
1688 case IB_CM_RTU_RECEIVED:
1689 case IB_CM_USER_ESTABLISHED:
1690 event.event = RDMA_CM_EVENT_ESTABLISHED;
1691 break;
1692 case IB_CM_DREQ_ERROR:
1693 event.status = -ETIMEDOUT; /* fall through */
1694 case IB_CM_DREQ_RECEIVED:
1695 case IB_CM_DREP_RECEIVED:
1696 if (!cma_comp_exch(id_priv, RDMA_CM_CONNECT,
1697 RDMA_CM_DISCONNECT))
1698 goto out;
1699 event.event = RDMA_CM_EVENT_DISCONNECTED;
1700 break;
1701 case IB_CM_TIMEWAIT_EXIT:
1702 event.event = RDMA_CM_EVENT_TIMEWAIT_EXIT;
1703 break;
1704 case IB_CM_MRA_RECEIVED:
1705 /* ignore event */
1706 goto out;
1707 case IB_CM_REJ_RECEIVED:
1708 cma_modify_qp_err(id_priv);
1709 event.status = ib_event->param.rej_rcvd.reason;
1710 event.event = RDMA_CM_EVENT_REJECTED;
1711 event.param.conn.private_data = ib_event->private_data;
1712 event.param.conn.private_data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
1713 break;
1714 default:
1715 pr_err("RDMA CMA: unexpected IB CM event: %d\n",
1716 ib_event->event);
1717 goto out;
1718 }
1719
1720 ret = id_priv->id.event_handler(&id_priv->id, &event);
1721 if (ret) {
1722 /* Destroy the CM ID by returning a non-zero value. */
1723 id_priv->cm_id.ib = NULL;
1724 cma_exch(id_priv, RDMA_CM_DESTROYING);
1725 mutex_unlock(&id_priv->handler_mutex);
1726 rdma_destroy_id(&id_priv->id);
1727 return ret;
1728 }
1729 out:
1730 mutex_unlock(&id_priv->handler_mutex);
1731 return ret;
1732 }
1733
1734 static struct rdma_id_private *cma_new_conn_id(struct rdma_cm_id *listen_id,
1735 struct ib_cm_event *ib_event,
1736 struct net_device *net_dev)
1737 {
1738 struct rdma_id_private *id_priv;
1739 struct rdma_cm_id *id;
1740 struct rdma_route *rt;
1741 const sa_family_t ss_family = listen_id->route.addr.src_addr.ss_family;
1742 const __be64 service_id =
1743 ib_event->param.req_rcvd.primary_path->service_id;
1744 int ret;
1745
1746 id = rdma_create_id(listen_id->route.addr.dev_addr.net,
1747 listen_id->event_handler, listen_id->context,
1748 listen_id->ps, ib_event->param.req_rcvd.qp_type);
1749 if (IS_ERR(id))
1750 return NULL;
1751
1752 id_priv = container_of(id, struct rdma_id_private, id);
1753 if (cma_save_net_info((struct sockaddr *)&id->route.addr.src_addr,
1754 (struct sockaddr *)&id->route.addr.dst_addr,
1755 listen_id, ib_event, ss_family, service_id))
1756 goto err;
1757
1758 rt = &id->route;
1759 rt->num_paths = ib_event->param.req_rcvd.alternate_path ? 2 : 1;
1760 rt->path_rec = kmalloc(sizeof *rt->path_rec * rt->num_paths,
1761 GFP_KERNEL);
1762 if (!rt->path_rec)
1763 goto err;
1764
1765 rt->path_rec[0] = *ib_event->param.req_rcvd.primary_path;
1766 if (rt->num_paths == 2)
1767 rt->path_rec[1] = *ib_event->param.req_rcvd.alternate_path;
1768
1769 if (net_dev) {
1770 ret = rdma_copy_addr(&rt->addr.dev_addr, net_dev, NULL);
1771 if (ret)
1772 goto err;
1773 } else {
1774 if (!cma_protocol_roce(listen_id) &&
1775 cma_any_addr(cma_src_addr(id_priv))) {
1776 rt->addr.dev_addr.dev_type = ARPHRD_INFINIBAND;
1777 rdma_addr_set_sgid(&rt->addr.dev_addr, &rt->path_rec[0].sgid);
1778 ib_addr_set_pkey(&rt->addr.dev_addr, be16_to_cpu(rt->path_rec[0].pkey));
1779 } else if (!cma_any_addr(cma_src_addr(id_priv))) {
1780 ret = cma_translate_addr(cma_src_addr(id_priv), &rt->addr.dev_addr);
1781 if (ret)
1782 goto err;
1783 }
1784 }
1785 rdma_addr_set_dgid(&rt->addr.dev_addr, &rt->path_rec[0].dgid);
1786
1787 id_priv->state = RDMA_CM_CONNECT;
1788 return id_priv;
1789
1790 err:
1791 rdma_destroy_id(id);
1792 return NULL;
1793 }
1794
1795 static struct rdma_id_private *cma_new_udp_id(struct rdma_cm_id *listen_id,
1796 struct ib_cm_event *ib_event,
1797 struct net_device *net_dev)
1798 {
1799 struct rdma_id_private *id_priv;
1800 struct rdma_cm_id *id;
1801 const sa_family_t ss_family = listen_id->route.addr.src_addr.ss_family;
1802 struct net *net = listen_id->route.addr.dev_addr.net;
1803 int ret;
1804
1805 id = rdma_create_id(net, listen_id->event_handler, listen_id->context,
1806 listen_id->ps, IB_QPT_UD);
1807 if (IS_ERR(id))
1808 return NULL;
1809
1810 id_priv = container_of(id, struct rdma_id_private, id);
1811 if (cma_save_net_info((struct sockaddr *)&id->route.addr.src_addr,
1812 (struct sockaddr *)&id->route.addr.dst_addr,
1813 listen_id, ib_event, ss_family,
1814 ib_event->param.sidr_req_rcvd.service_id))
1815 goto err;
1816
1817 if (net_dev) {
1818 ret = rdma_copy_addr(&id->route.addr.dev_addr, net_dev, NULL);
1819 if (ret)
1820 goto err;
1821 } else {
1822 if (!cma_any_addr(cma_src_addr(id_priv))) {
1823 ret = cma_translate_addr(cma_src_addr(id_priv),
1824 &id->route.addr.dev_addr);
1825 if (ret)
1826 goto err;
1827 }
1828 }
1829
1830 id_priv->state = RDMA_CM_CONNECT;
1831 return id_priv;
1832 err:
1833 rdma_destroy_id(id);
1834 return NULL;
1835 }
1836
1837 static void cma_set_req_event_data(struct rdma_cm_event *event,
1838 struct ib_cm_req_event_param *req_data,
1839 void *private_data, int offset)
1840 {
1841 event->param.conn.private_data = private_data + offset;
1842 event->param.conn.private_data_len = IB_CM_REQ_PRIVATE_DATA_SIZE - offset;
1843 event->param.conn.responder_resources = req_data->responder_resources;
1844 event->param.conn.initiator_depth = req_data->initiator_depth;
1845 event->param.conn.flow_control = req_data->flow_control;
1846 event->param.conn.retry_count = req_data->retry_count;
1847 event->param.conn.rnr_retry_count = req_data->rnr_retry_count;
1848 event->param.conn.srq = req_data->srq;
1849 event->param.conn.qp_num = req_data->remote_qpn;
1850 }
1851
1852 static int cma_check_req_qp_type(struct rdma_cm_id *id, struct ib_cm_event *ib_event)
1853 {
1854 return (((ib_event->event == IB_CM_REQ_RECEIVED) &&
1855 (ib_event->param.req_rcvd.qp_type == id->qp_type)) ||
1856 ((ib_event->event == IB_CM_SIDR_REQ_RECEIVED) &&
1857 (id->qp_type == IB_QPT_UD)) ||
1858 (!id->qp_type));
1859 }
1860
1861 static int cma_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
1862 {
1863 struct rdma_id_private *listen_id, *conn_id = NULL;
1864 struct rdma_cm_event event;
1865 struct net_device *net_dev;
1866 int offset, ret;
1867
1868 listen_id = cma_id_from_event(cm_id, ib_event, &net_dev);
1869 if (IS_ERR(listen_id))
1870 return PTR_ERR(listen_id);
1871
1872 if (!cma_check_req_qp_type(&listen_id->id, ib_event)) {
1873 ret = -EINVAL;
1874 goto net_dev_put;
1875 }
1876
1877 mutex_lock(&listen_id->handler_mutex);
1878 if (listen_id->state != RDMA_CM_LISTEN) {
1879 ret = -ECONNABORTED;
1880 goto err1;
1881 }
1882
1883 memset(&event, 0, sizeof event);
1884 offset = cma_user_data_offset(listen_id);
1885 event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
1886 if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED) {
1887 conn_id = cma_new_udp_id(&listen_id->id, ib_event, net_dev);
1888 event.param.ud.private_data = ib_event->private_data + offset;
1889 event.param.ud.private_data_len =
1890 IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE - offset;
1891 } else {
1892 conn_id = cma_new_conn_id(&listen_id->id, ib_event, net_dev);
1893 cma_set_req_event_data(&event, &ib_event->param.req_rcvd,
1894 ib_event->private_data, offset);
1895 }
1896 if (!conn_id) {
1897 ret = -ENOMEM;
1898 goto err1;
1899 }
1900
1901 mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
1902 ret = cma_acquire_dev(conn_id, listen_id);
1903 if (ret)
1904 goto err2;
1905
1906 conn_id->cm_id.ib = cm_id;
1907 cm_id->context = conn_id;
1908 cm_id->cm_handler = cma_ib_handler;
1909
1910 /*
1911 * Protect against the user destroying conn_id from another thread
1912 * until we're done accessing it.
1913 */
1914 atomic_inc(&conn_id->refcount);
1915 ret = conn_id->id.event_handler(&conn_id->id, &event);
1916 if (ret)
1917 goto err3;
1918 /*
1919 * Acquire mutex to prevent user executing rdma_destroy_id()
1920 * while we're accessing the cm_id.
1921 */
1922 mutex_lock(&lock);
1923 if (cma_comp(conn_id, RDMA_CM_CONNECT) &&
1924 (conn_id->id.qp_type != IB_QPT_UD))
1925 ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0);
1926 mutex_unlock(&lock);
1927 mutex_unlock(&conn_id->handler_mutex);
1928 mutex_unlock(&listen_id->handler_mutex);
1929 cma_deref_id(conn_id);
1930 if (net_dev)
1931 dev_put(net_dev);
1932 return 0;
1933
1934 err3:
1935 cma_deref_id(conn_id);
1936 /* Destroy the CM ID by returning a non-zero value. */
1937 conn_id->cm_id.ib = NULL;
1938 err2:
1939 cma_exch(conn_id, RDMA_CM_DESTROYING);
1940 mutex_unlock(&conn_id->handler_mutex);
1941 err1:
1942 mutex_unlock(&listen_id->handler_mutex);
1943 if (conn_id)
1944 rdma_destroy_id(&conn_id->id);
1945
1946 net_dev_put:
1947 if (net_dev)
1948 dev_put(net_dev);
1949
1950 return ret;
1951 }
1952
1953 __be64 rdma_get_service_id(struct rdma_cm_id *id, struct sockaddr *addr)
1954 {
1955 if (addr->sa_family == AF_IB)
1956 return ((struct sockaddr_ib *) addr)->sib_sid;
1957
1958 return cpu_to_be64(((u64)id->ps << 16) + be16_to_cpu(cma_port(addr)));
1959 }
1960 EXPORT_SYMBOL(rdma_get_service_id);
1961
1962 static int cma_iw_handler(struct iw_cm_id *iw_id, struct iw_cm_event *iw_event)
1963 {
1964 struct rdma_id_private *id_priv = iw_id->context;
1965 struct rdma_cm_event event;
1966 int ret = 0;
1967 struct sockaddr *laddr = (struct sockaddr *)&iw_event->local_addr;
1968 struct sockaddr *raddr = (struct sockaddr *)&iw_event->remote_addr;
1969
1970 mutex_lock(&id_priv->handler_mutex);
1971 if (id_priv->state != RDMA_CM_CONNECT)
1972 goto out;
1973
1974 memset(&event, 0, sizeof event);
1975 switch (iw_event->event) {
1976 case IW_CM_EVENT_CLOSE:
1977 event.event = RDMA_CM_EVENT_DISCONNECTED;
1978 break;
1979 case IW_CM_EVENT_CONNECT_REPLY:
1980 memcpy(cma_src_addr(id_priv), laddr,
1981 rdma_addr_size(laddr));
1982 memcpy(cma_dst_addr(id_priv), raddr,
1983 rdma_addr_size(raddr));
1984 switch (iw_event->status) {
1985 case 0:
1986 event.event = RDMA_CM_EVENT_ESTABLISHED;
1987 event.param.conn.initiator_depth = iw_event->ird;
1988 event.param.conn.responder_resources = iw_event->ord;
1989 break;
1990 case -ECONNRESET:
1991 case -ECONNREFUSED:
1992 event.event = RDMA_CM_EVENT_REJECTED;
1993 break;
1994 case -ETIMEDOUT:
1995 event.event = RDMA_CM_EVENT_UNREACHABLE;
1996 break;
1997 default:
1998 event.event = RDMA_CM_EVENT_CONNECT_ERROR;
1999 break;
2000 }
2001 break;
2002 case IW_CM_EVENT_ESTABLISHED:
2003 event.event = RDMA_CM_EVENT_ESTABLISHED;
2004 event.param.conn.initiator_depth = iw_event->ird;
2005 event.param.conn.responder_resources = iw_event->ord;
2006 break;
2007 default:
2008 BUG_ON(1);
2009 }
2010
2011 event.status = iw_event->status;
2012 event.param.conn.private_data = iw_event->private_data;
2013 event.param.conn.private_data_len = iw_event->private_data_len;
2014 ret = id_priv->id.event_handler(&id_priv->id, &event);
2015 if (ret) {
2016 /* Destroy the CM ID by returning a non-zero value. */
2017 id_priv->cm_id.iw = NULL;
2018 cma_exch(id_priv, RDMA_CM_DESTROYING);
2019 mutex_unlock(&id_priv->handler_mutex);
2020 rdma_destroy_id(&id_priv->id);
2021 return ret;
2022 }
2023
2024 out:
2025 mutex_unlock(&id_priv->handler_mutex);
2026 return ret;
2027 }
2028
2029 static int iw_conn_req_handler(struct iw_cm_id *cm_id,
2030 struct iw_cm_event *iw_event)
2031 {
2032 struct rdma_cm_id *new_cm_id;
2033 struct rdma_id_private *listen_id, *conn_id;
2034 struct rdma_cm_event event;
2035 int ret = -ECONNABORTED;
2036 struct sockaddr *laddr = (struct sockaddr *)&iw_event->local_addr;
2037 struct sockaddr *raddr = (struct sockaddr *)&iw_event->remote_addr;
2038
2039 listen_id = cm_id->context;
2040
2041 mutex_lock(&listen_id->handler_mutex);
2042 if (listen_id->state != RDMA_CM_LISTEN)
2043 goto out;
2044
2045 /* Create a new RDMA id for the new IW CM ID */
2046 new_cm_id = rdma_create_id(listen_id->id.route.addr.dev_addr.net,
2047 listen_id->id.event_handler,
2048 listen_id->id.context,
2049 RDMA_PS_TCP, IB_QPT_RC);
2050 if (IS_ERR(new_cm_id)) {
2051 ret = -ENOMEM;
2052 goto out;
2053 }
2054 conn_id = container_of(new_cm_id, struct rdma_id_private, id);
2055 mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
2056 conn_id->state = RDMA_CM_CONNECT;
2057
2058 ret = rdma_translate_ip(laddr, &conn_id->id.route.addr.dev_addr, NULL);
2059 if (ret) {
2060 mutex_unlock(&conn_id->handler_mutex);
2061 rdma_destroy_id(new_cm_id);
2062 goto out;
2063 }
2064
2065 ret = cma_acquire_dev(conn_id, listen_id);
2066 if (ret) {
2067 mutex_unlock(&conn_id->handler_mutex);
2068 rdma_destroy_id(new_cm_id);
2069 goto out;
2070 }
2071
2072 conn_id->cm_id.iw = cm_id;
2073 cm_id->context = conn_id;
2074 cm_id->cm_handler = cma_iw_handler;
2075
2076 memcpy(cma_src_addr(conn_id), laddr, rdma_addr_size(laddr));
2077 memcpy(cma_dst_addr(conn_id), raddr, rdma_addr_size(raddr));
2078
2079 memset(&event, 0, sizeof event);
2080 event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
2081 event.param.conn.private_data = iw_event->private_data;
2082 event.param.conn.private_data_len = iw_event->private_data_len;
2083 event.param.conn.initiator_depth = iw_event->ird;
2084 event.param.conn.responder_resources = iw_event->ord;
2085
2086 /*
2087 * Protect against the user destroying conn_id from another thread
2088 * until we're done accessing it.
2089 */
2090 atomic_inc(&conn_id->refcount);
2091 ret = conn_id->id.event_handler(&conn_id->id, &event);
2092 if (ret) {
2093 /* User wants to destroy the CM ID */
2094 conn_id->cm_id.iw = NULL;
2095 cma_exch(conn_id, RDMA_CM_DESTROYING);
2096 mutex_unlock(&conn_id->handler_mutex);
2097 cma_deref_id(conn_id);
2098 rdma_destroy_id(&conn_id->id);
2099 goto out;
2100 }
2101
2102 mutex_unlock(&conn_id->handler_mutex);
2103 cma_deref_id(conn_id);
2104
2105 out:
2106 mutex_unlock(&listen_id->handler_mutex);
2107 return ret;
2108 }
2109
2110 static int cma_ib_listen(struct rdma_id_private *id_priv)
2111 {
2112 struct sockaddr *addr;
2113 struct ib_cm_id *id;
2114 __be64 svc_id;
2115
2116 addr = cma_src_addr(id_priv);
2117 svc_id = rdma_get_service_id(&id_priv->id, addr);
2118 id = ib_cm_insert_listen(id_priv->id.device, cma_req_handler, svc_id);
2119 if (IS_ERR(id))
2120 return PTR_ERR(id);
2121 id_priv->cm_id.ib = id;
2122
2123 return 0;
2124 }
2125
2126 static int cma_iw_listen(struct rdma_id_private *id_priv, int backlog)
2127 {
2128 int ret;
2129 struct iw_cm_id *id;
2130
2131 id = iw_create_cm_id(id_priv->id.device,
2132 iw_conn_req_handler,
2133 id_priv);
2134 if (IS_ERR(id))
2135 return PTR_ERR(id);
2136
2137 id->tos = id_priv->tos;
2138 id_priv->cm_id.iw = id;
2139
2140 memcpy(&id_priv->cm_id.iw->local_addr, cma_src_addr(id_priv),
2141 rdma_addr_size(cma_src_addr(id_priv)));
2142
2143 ret = iw_cm_listen(id_priv->cm_id.iw, backlog);
2144
2145 if (ret) {
2146 iw_destroy_cm_id(id_priv->cm_id.iw);
2147 id_priv->cm_id.iw = NULL;
2148 }
2149
2150 return ret;
2151 }
2152
2153 static int cma_listen_handler(struct rdma_cm_id *id,
2154 struct rdma_cm_event *event)
2155 {
2156 struct rdma_id_private *id_priv = id->context;
2157
2158 id->context = id_priv->id.context;
2159 id->event_handler = id_priv->id.event_handler;
2160 return id_priv->id.event_handler(id, event);
2161 }
2162
2163 static void cma_listen_on_dev(struct rdma_id_private *id_priv,
2164 struct cma_device *cma_dev)
2165 {
2166 struct rdma_id_private *dev_id_priv;
2167 struct rdma_cm_id *id;
2168 struct net *net = id_priv->id.route.addr.dev_addr.net;
2169 int ret;
2170
2171 if (cma_family(id_priv) == AF_IB && !rdma_cap_ib_cm(cma_dev->device, 1))
2172 return;
2173
2174 id = rdma_create_id(net, cma_listen_handler, id_priv, id_priv->id.ps,
2175 id_priv->id.qp_type);
2176 if (IS_ERR(id))
2177 return;
2178
2179 dev_id_priv = container_of(id, struct rdma_id_private, id);
2180
2181 dev_id_priv->state = RDMA_CM_ADDR_BOUND;
2182 memcpy(cma_src_addr(dev_id_priv), cma_src_addr(id_priv),
2183 rdma_addr_size(cma_src_addr(id_priv)));
2184
2185 _cma_attach_to_dev(dev_id_priv, cma_dev);
2186 list_add_tail(&dev_id_priv->listen_list, &id_priv->listen_list);
2187 atomic_inc(&id_priv->refcount);
2188 dev_id_priv->internal_id = 1;
2189 dev_id_priv->afonly = id_priv->afonly;
2190
2191 ret = rdma_listen(id, id_priv->backlog);
2192 if (ret)
2193 pr_warn("RDMA CMA: cma_listen_on_dev, error %d, listening on device %s\n",
2194 ret, cma_dev->device->name);
2195 }
2196
2197 static void cma_listen_on_all(struct rdma_id_private *id_priv)
2198 {
2199 struct cma_device *cma_dev;
2200
2201 mutex_lock(&lock);
2202 list_add_tail(&id_priv->list, &listen_any_list);
2203 list_for_each_entry(cma_dev, &dev_list, list)
2204 cma_listen_on_dev(id_priv, cma_dev);
2205 mutex_unlock(&lock);
2206 }
2207
2208 void rdma_set_service_type(struct rdma_cm_id *id, int tos)
2209 {
2210 struct rdma_id_private *id_priv;
2211
2212 id_priv = container_of(id, struct rdma_id_private, id);
2213 id_priv->tos = (u8) tos;
2214 }
2215 EXPORT_SYMBOL(rdma_set_service_type);
2216
2217 static void cma_query_handler(int status, struct ib_sa_path_rec *path_rec,
2218 void *context)
2219 {
2220 struct cma_work *work = context;
2221 struct rdma_route *route;
2222
2223 route = &work->id->id.route;
2224
2225 if (!status) {
2226 route->num_paths = 1;
2227 *route->path_rec = *path_rec;
2228 } else {
2229 work->old_state = RDMA_CM_ROUTE_QUERY;
2230 work->new_state = RDMA_CM_ADDR_RESOLVED;
2231 work->event.event = RDMA_CM_EVENT_ROUTE_ERROR;
2232 work->event.status = status;
2233 }
2234
2235 queue_work(cma_wq, &work->work);
2236 }
2237
2238 static int cma_query_ib_route(struct rdma_id_private *id_priv, int timeout_ms,
2239 struct cma_work *work)
2240 {
2241 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
2242 struct ib_sa_path_rec path_rec;
2243 ib_sa_comp_mask comp_mask;
2244 struct sockaddr_in6 *sin6;
2245 struct sockaddr_ib *sib;
2246
2247 memset(&path_rec, 0, sizeof path_rec);
2248 rdma_addr_get_sgid(dev_addr, &path_rec.sgid);
2249 rdma_addr_get_dgid(dev_addr, &path_rec.dgid);
2250 path_rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
2251 path_rec.numb_path = 1;
2252 path_rec.reversible = 1;
2253 path_rec.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
2254
2255 comp_mask = IB_SA_PATH_REC_DGID | IB_SA_PATH_REC_SGID |
2256 IB_SA_PATH_REC_PKEY | IB_SA_PATH_REC_NUMB_PATH |
2257 IB_SA_PATH_REC_REVERSIBLE | IB_SA_PATH_REC_SERVICE_ID;
2258
2259 switch (cma_family(id_priv)) {
2260 case AF_INET:
2261 path_rec.qos_class = cpu_to_be16((u16) id_priv->tos);
2262 comp_mask |= IB_SA_PATH_REC_QOS_CLASS;
2263 break;
2264 case AF_INET6:
2265 sin6 = (struct sockaddr_in6 *) cma_src_addr(id_priv);
2266 path_rec.traffic_class = (u8) (be32_to_cpu(sin6->sin6_flowinfo) >> 20);
2267 comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
2268 break;
2269 case AF_IB:
2270 sib = (struct sockaddr_ib *) cma_src_addr(id_priv);
2271 path_rec.traffic_class = (u8) (be32_to_cpu(sib->sib_flowinfo) >> 20);
2272 comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
2273 break;
2274 }
2275
2276 id_priv->query_id = ib_sa_path_rec_get(&sa_client, id_priv->id.device,
2277 id_priv->id.port_num, &path_rec,
2278 comp_mask, timeout_ms,
2279 GFP_KERNEL, cma_query_handler,
2280 work, &id_priv->query);
2281
2282 return (id_priv->query_id < 0) ? id_priv->query_id : 0;
2283 }
2284
2285 static void cma_work_handler(struct work_struct *_work)
2286 {
2287 struct cma_work *work = container_of(_work, struct cma_work, work);
2288 struct rdma_id_private *id_priv = work->id;
2289 int destroy = 0;
2290
2291 mutex_lock(&id_priv->handler_mutex);
2292 if (!cma_comp_exch(id_priv, work->old_state, work->new_state))
2293 goto out;
2294
2295 if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
2296 cma_exch(id_priv, RDMA_CM_DESTROYING);
2297 destroy = 1;
2298 }
2299 out:
2300 mutex_unlock(&id_priv->handler_mutex);
2301 cma_deref_id(id_priv);
2302 if (destroy)
2303 rdma_destroy_id(&id_priv->id);
2304 kfree(work);
2305 }
2306
2307 static void cma_ndev_work_handler(struct work_struct *_work)
2308 {
2309 struct cma_ndev_work *work = container_of(_work, struct cma_ndev_work, work);
2310 struct rdma_id_private *id_priv = work->id;
2311 int destroy = 0;
2312
2313 mutex_lock(&id_priv->handler_mutex);
2314 if (id_priv->state == RDMA_CM_DESTROYING ||
2315 id_priv->state == RDMA_CM_DEVICE_REMOVAL)
2316 goto out;
2317
2318 if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
2319 cma_exch(id_priv, RDMA_CM_DESTROYING);
2320 destroy = 1;
2321 }
2322
2323 out:
2324 mutex_unlock(&id_priv->handler_mutex);
2325 cma_deref_id(id_priv);
2326 if (destroy)
2327 rdma_destroy_id(&id_priv->id);
2328 kfree(work);
2329 }
2330
2331 static int cma_resolve_ib_route(struct rdma_id_private *id_priv, int timeout_ms)
2332 {
2333 struct rdma_route *route = &id_priv->id.route;
2334 struct cma_work *work;
2335 int ret;
2336
2337 work = kzalloc(sizeof *work, GFP_KERNEL);
2338 if (!work)
2339 return -ENOMEM;
2340
2341 work->id = id_priv;
2342 INIT_WORK(&work->work, cma_work_handler);
2343 work->old_state = RDMA_CM_ROUTE_QUERY;
2344 work->new_state = RDMA_CM_ROUTE_RESOLVED;
2345 work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
2346
2347 route->path_rec = kmalloc(sizeof *route->path_rec, GFP_KERNEL);
2348 if (!route->path_rec) {
2349 ret = -ENOMEM;
2350 goto err1;
2351 }
2352
2353 ret = cma_query_ib_route(id_priv, timeout_ms, work);
2354 if (ret)
2355 goto err2;
2356
2357 return 0;
2358 err2:
2359 kfree(route->path_rec);
2360 route->path_rec = NULL;
2361 err1:
2362 kfree(work);
2363 return ret;
2364 }
2365
2366 int rdma_set_ib_paths(struct rdma_cm_id *id,
2367 struct ib_sa_path_rec *path_rec, int num_paths)
2368 {
2369 struct rdma_id_private *id_priv;
2370 int ret;
2371
2372 id_priv = container_of(id, struct rdma_id_private, id);
2373 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED,
2374 RDMA_CM_ROUTE_RESOLVED))
2375 return -EINVAL;
2376
2377 id->route.path_rec = kmemdup(path_rec, sizeof *path_rec * num_paths,
2378 GFP_KERNEL);
2379 if (!id->route.path_rec) {
2380 ret = -ENOMEM;
2381 goto err;
2382 }
2383
2384 id->route.num_paths = num_paths;
2385 return 0;
2386 err:
2387 cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_ADDR_RESOLVED);
2388 return ret;
2389 }
2390 EXPORT_SYMBOL(rdma_set_ib_paths);
2391
2392 static int cma_resolve_iw_route(struct rdma_id_private *id_priv, int timeout_ms)
2393 {
2394 struct cma_work *work;
2395
2396 work = kzalloc(sizeof *work, GFP_KERNEL);
2397 if (!work)
2398 return -ENOMEM;
2399
2400 work->id = id_priv;
2401 INIT_WORK(&work->work, cma_work_handler);
2402 work->old_state = RDMA_CM_ROUTE_QUERY;
2403 work->new_state = RDMA_CM_ROUTE_RESOLVED;
2404 work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
2405 queue_work(cma_wq, &work->work);
2406 return 0;
2407 }
2408
2409 static int iboe_tos_to_sl(struct net_device *ndev, int tos)
2410 {
2411 int prio;
2412 struct net_device *dev;
2413
2414 prio = rt_tos2priority(tos);
2415 dev = ndev->priv_flags & IFF_802_1Q_VLAN ?
2416 vlan_dev_real_dev(ndev) : ndev;
2417
2418 if (dev->num_tc)
2419 return netdev_get_prio_tc_map(dev, prio);
2420
2421 #if IS_ENABLED(CONFIG_VLAN_8021Q)
2422 if (ndev->priv_flags & IFF_802_1Q_VLAN)
2423 return (vlan_dev_get_egress_qos_mask(ndev, prio) &
2424 VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
2425 #endif
2426 return 0;
2427 }
2428
2429 static int cma_resolve_iboe_route(struct rdma_id_private *id_priv)
2430 {
2431 struct rdma_route *route = &id_priv->id.route;
2432 struct rdma_addr *addr = &route->addr;
2433 struct cma_work *work;
2434 int ret;
2435 struct net_device *ndev = NULL;
2436
2437
2438 work = kzalloc(sizeof *work, GFP_KERNEL);
2439 if (!work)
2440 return -ENOMEM;
2441
2442 work->id = id_priv;
2443 INIT_WORK(&work->work, cma_work_handler);
2444
2445 route->path_rec = kzalloc(sizeof *route->path_rec, GFP_KERNEL);
2446 if (!route->path_rec) {
2447 ret = -ENOMEM;
2448 goto err1;
2449 }
2450
2451 route->num_paths = 1;
2452
2453 if (addr->dev_addr.bound_dev_if) {
2454 ndev = dev_get_by_index(&init_net, addr->dev_addr.bound_dev_if);
2455 if (!ndev)
2456 return -ENODEV;
2457
2458 if (ndev->flags & IFF_LOOPBACK) {
2459 dev_put(ndev);
2460 if (!id_priv->id.device->get_netdev)
2461 return -EOPNOTSUPP;
2462
2463 ndev = id_priv->id.device->get_netdev(id_priv->id.device,
2464 id_priv->id.port_num);
2465 if (!ndev)
2466 return -ENODEV;
2467 }
2468
2469 route->path_rec->net = &init_net;
2470 route->path_rec->ifindex = ndev->ifindex;
2471 route->path_rec->gid_type = id_priv->gid_type;
2472 }
2473 if (!ndev) {
2474 ret = -ENODEV;
2475 goto err2;
2476 }
2477
2478 memcpy(route->path_rec->dmac, addr->dev_addr.dst_dev_addr, ETH_ALEN);
2479
2480 rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
2481 &route->path_rec->sgid);
2482 rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.dst_addr,
2483 &route->path_rec->dgid);
2484
2485 /* Use the hint from IP Stack to select GID Type */
2486 if (route->path_rec->gid_type < ib_network_to_gid_type(addr->dev_addr.network))
2487 route->path_rec->gid_type = ib_network_to_gid_type(addr->dev_addr.network);
2488 if (((struct sockaddr *)&id_priv->id.route.addr.dst_addr)->sa_family != AF_IB)
2489 /* TODO: get the hoplimit from the inet/inet6 device */
2490 route->path_rec->hop_limit = addr->dev_addr.hoplimit;
2491 else
2492 route->path_rec->hop_limit = 1;
2493 route->path_rec->reversible = 1;
2494 route->path_rec->pkey = cpu_to_be16(0xffff);
2495 route->path_rec->mtu_selector = IB_SA_EQ;
2496 route->path_rec->sl = iboe_tos_to_sl(ndev, id_priv->tos);
2497 route->path_rec->mtu = iboe_get_mtu(ndev->mtu);
2498 route->path_rec->rate_selector = IB_SA_EQ;
2499 route->path_rec->rate = iboe_get_rate(ndev);
2500 dev_put(ndev);
2501 route->path_rec->packet_life_time_selector = IB_SA_EQ;
2502 route->path_rec->packet_life_time = CMA_IBOE_PACKET_LIFETIME;
2503 if (!route->path_rec->mtu) {
2504 ret = -EINVAL;
2505 goto err2;
2506 }
2507
2508 work->old_state = RDMA_CM_ROUTE_QUERY;
2509 work->new_state = RDMA_CM_ROUTE_RESOLVED;
2510 work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
2511 work->event.status = 0;
2512
2513 queue_work(cma_wq, &work->work);
2514
2515 return 0;
2516
2517 err2:
2518 kfree(route->path_rec);
2519 route->path_rec = NULL;
2520 err1:
2521 kfree(work);
2522 return ret;
2523 }
2524
2525 int rdma_resolve_route(struct rdma_cm_id *id, int timeout_ms)
2526 {
2527 struct rdma_id_private *id_priv;
2528 int ret;
2529
2530 id_priv = container_of(id, struct rdma_id_private, id);
2531 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED, RDMA_CM_ROUTE_QUERY))
2532 return -EINVAL;
2533
2534 atomic_inc(&id_priv->refcount);
2535 if (rdma_cap_ib_sa(id->device, id->port_num))
2536 ret = cma_resolve_ib_route(id_priv, timeout_ms);
2537 else if (rdma_protocol_roce(id->device, id->port_num))
2538 ret = cma_resolve_iboe_route(id_priv);
2539 else if (rdma_protocol_iwarp(id->device, id->port_num))
2540 ret = cma_resolve_iw_route(id_priv, timeout_ms);
2541 else
2542 ret = -ENOSYS;
2543
2544 if (ret)
2545 goto err;
2546
2547 return 0;
2548 err:
2549 cma_comp_exch(id_priv, RDMA_CM_ROUTE_QUERY, RDMA_CM_ADDR_RESOLVED);
2550 cma_deref_id(id_priv);
2551 return ret;
2552 }
2553 EXPORT_SYMBOL(rdma_resolve_route);
2554
2555 static void cma_set_loopback(struct sockaddr *addr)
2556 {
2557 switch (addr->sa_family) {
2558 case AF_INET:
2559 ((struct sockaddr_in *) addr)->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
2560 break;
2561 case AF_INET6:
2562 ipv6_addr_set(&((struct sockaddr_in6 *) addr)->sin6_addr,
2563 0, 0, 0, htonl(1));
2564 break;
2565 default:
2566 ib_addr_set(&((struct sockaddr_ib *) addr)->sib_addr,
2567 0, 0, 0, htonl(1));
2568 break;
2569 }
2570 }
2571
2572 static int cma_bind_loopback(struct rdma_id_private *id_priv)
2573 {
2574 struct cma_device *cma_dev, *cur_dev;
2575 struct ib_port_attr port_attr;
2576 union ib_gid gid;
2577 u16 pkey;
2578 int ret;
2579 u8 p;
2580
2581 cma_dev = NULL;
2582 mutex_lock(&lock);
2583 list_for_each_entry(cur_dev, &dev_list, list) {
2584 if (cma_family(id_priv) == AF_IB &&
2585 !rdma_cap_ib_cm(cur_dev->device, 1))
2586 continue;
2587
2588 if (!cma_dev)
2589 cma_dev = cur_dev;
2590
2591 for (p = 1; p <= cur_dev->device->phys_port_cnt; ++p) {
2592 if (!ib_query_port(cur_dev->device, p, &port_attr) &&
2593 port_attr.state == IB_PORT_ACTIVE) {
2594 cma_dev = cur_dev;
2595 goto port_found;
2596 }
2597 }
2598 }
2599
2600 if (!cma_dev) {
2601 ret = -ENODEV;
2602 goto out;
2603 }
2604
2605 p = 1;
2606
2607 port_found:
2608 ret = ib_get_cached_gid(cma_dev->device, p, 0, &gid, NULL);
2609 if (ret)
2610 goto out;
2611
2612 ret = ib_get_cached_pkey(cma_dev->device, p, 0, &pkey);
2613 if (ret)
2614 goto out;
2615
2616 id_priv->id.route.addr.dev_addr.dev_type =
2617 (rdma_protocol_ib(cma_dev->device, p)) ?
2618 ARPHRD_INFINIBAND : ARPHRD_ETHER;
2619
2620 rdma_addr_set_sgid(&id_priv->id.route.addr.dev_addr, &gid);
2621 ib_addr_set_pkey(&id_priv->id.route.addr.dev_addr, pkey);
2622 id_priv->id.port_num = p;
2623 cma_attach_to_dev(id_priv, cma_dev);
2624 cma_set_loopback(cma_src_addr(id_priv));
2625 out:
2626 mutex_unlock(&lock);
2627 return ret;
2628 }
2629
2630 static void addr_handler(int status, struct sockaddr *src_addr,
2631 struct rdma_dev_addr *dev_addr, void *context)
2632 {
2633 struct rdma_id_private *id_priv = context;
2634 struct rdma_cm_event event;
2635
2636 memset(&event, 0, sizeof event);
2637 mutex_lock(&id_priv->handler_mutex);
2638 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY,
2639 RDMA_CM_ADDR_RESOLVED))
2640 goto out;
2641
2642 memcpy(cma_src_addr(id_priv), src_addr, rdma_addr_size(src_addr));
2643 if (!status && !id_priv->cma_dev)
2644 status = cma_acquire_dev(id_priv, NULL);
2645
2646 if (status) {
2647 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED,
2648 RDMA_CM_ADDR_BOUND))
2649 goto out;
2650 event.event = RDMA_CM_EVENT_ADDR_ERROR;
2651 event.status = status;
2652 } else
2653 event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
2654
2655 if (id_priv->id.event_handler(&id_priv->id, &event)) {
2656 cma_exch(id_priv, RDMA_CM_DESTROYING);
2657 mutex_unlock(&id_priv->handler_mutex);
2658 cma_deref_id(id_priv);
2659 rdma_destroy_id(&id_priv->id);
2660 return;
2661 }
2662 out:
2663 mutex_unlock(&id_priv->handler_mutex);
2664 cma_deref_id(id_priv);
2665 }
2666
2667 static int cma_resolve_loopback(struct rdma_id_private *id_priv)
2668 {
2669 struct cma_work *work;
2670 union ib_gid gid;
2671 int ret;
2672
2673 work = kzalloc(sizeof *work, GFP_KERNEL);
2674 if (!work)
2675 return -ENOMEM;
2676
2677 if (!id_priv->cma_dev) {
2678 ret = cma_bind_loopback(id_priv);
2679 if (ret)
2680 goto err;
2681 }
2682
2683 rdma_addr_get_sgid(&id_priv->id.route.addr.dev_addr, &gid);
2684 rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, &gid);
2685
2686 work->id = id_priv;
2687 INIT_WORK(&work->work, cma_work_handler);
2688 work->old_state = RDMA_CM_ADDR_QUERY;
2689 work->new_state = RDMA_CM_ADDR_RESOLVED;
2690 work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
2691 queue_work(cma_wq, &work->work);
2692 return 0;
2693 err:
2694 kfree(work);
2695 return ret;
2696 }
2697
2698 static int cma_resolve_ib_addr(struct rdma_id_private *id_priv)
2699 {
2700 struct cma_work *work;
2701 int ret;
2702
2703 work = kzalloc(sizeof *work, GFP_KERNEL);
2704 if (!work)
2705 return -ENOMEM;
2706
2707 if (!id_priv->cma_dev) {
2708 ret = cma_resolve_ib_dev(id_priv);
2709 if (ret)
2710 goto err;
2711 }
2712
2713 rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, (union ib_gid *)
2714 &(((struct sockaddr_ib *) &id_priv->id.route.addr.dst_addr)->sib_addr));
2715
2716 work->id = id_priv;
2717 INIT_WORK(&work->work, cma_work_handler);
2718 work->old_state = RDMA_CM_ADDR_QUERY;
2719 work->new_state = RDMA_CM_ADDR_RESOLVED;
2720 work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
2721 queue_work(cma_wq, &work->work);
2722 return 0;
2723 err:
2724 kfree(work);
2725 return ret;
2726 }
2727
2728 static int cma_bind_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
2729 struct sockaddr *dst_addr)
2730 {
2731 if (!src_addr || !src_addr->sa_family) {
2732 src_addr = (struct sockaddr *) &id->route.addr.src_addr;
2733 src_addr->sa_family = dst_addr->sa_family;
2734 if (dst_addr->sa_family == AF_INET6) {
2735 struct sockaddr_in6 *src_addr6 = (struct sockaddr_in6 *) src_addr;
2736 struct sockaddr_in6 *dst_addr6 = (struct sockaddr_in6 *) dst_addr;
2737 src_addr6->sin6_scope_id = dst_addr6->sin6_scope_id;
2738 if (ipv6_addr_type(&dst_addr6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
2739 id->route.addr.dev_addr.bound_dev_if = dst_addr6->sin6_scope_id;
2740 } else if (dst_addr->sa_family == AF_IB) {
2741 ((struct sockaddr_ib *) src_addr)->sib_pkey =
2742 ((struct sockaddr_ib *) dst_addr)->sib_pkey;
2743 }
2744 }
2745 return rdma_bind_addr(id, src_addr);
2746 }
2747
2748 int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
2749 struct sockaddr *dst_addr, int timeout_ms)
2750 {
2751 struct rdma_id_private *id_priv;
2752 int ret;
2753
2754 id_priv = container_of(id, struct rdma_id_private, id);
2755 if (id_priv->state == RDMA_CM_IDLE) {
2756 ret = cma_bind_addr(id, src_addr, dst_addr);
2757 if (ret)
2758 return ret;
2759 }
2760
2761 if (cma_family(id_priv) != dst_addr->sa_family)
2762 return -EINVAL;
2763
2764 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_ADDR_QUERY))
2765 return -EINVAL;
2766
2767 atomic_inc(&id_priv->refcount);
2768 memcpy(cma_dst_addr(id_priv), dst_addr, rdma_addr_size(dst_addr));
2769 if (cma_any_addr(dst_addr)) {
2770 ret = cma_resolve_loopback(id_priv);
2771 } else {
2772 if (dst_addr->sa_family == AF_IB) {
2773 ret = cma_resolve_ib_addr(id_priv);
2774 } else {
2775 ret = rdma_resolve_ip(&addr_client, cma_src_addr(id_priv),
2776 dst_addr, &id->route.addr.dev_addr,
2777 timeout_ms, addr_handler, id_priv);
2778 }
2779 }
2780 if (ret)
2781 goto err;
2782
2783 return 0;
2784 err:
2785 cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY, RDMA_CM_ADDR_BOUND);
2786 cma_deref_id(id_priv);
2787 return ret;
2788 }
2789 EXPORT_SYMBOL(rdma_resolve_addr);
2790
2791 int rdma_set_reuseaddr(struct rdma_cm_id *id, int reuse)
2792 {
2793 struct rdma_id_private *id_priv;
2794 unsigned long flags;
2795 int ret;
2796
2797 id_priv = container_of(id, struct rdma_id_private, id);
2798 spin_lock_irqsave(&id_priv->lock, flags);
2799 if (reuse || id_priv->state == RDMA_CM_IDLE) {
2800 id_priv->reuseaddr = reuse;
2801 ret = 0;
2802 } else {
2803 ret = -EINVAL;
2804 }
2805 spin_unlock_irqrestore(&id_priv->lock, flags);
2806 return ret;
2807 }
2808 EXPORT_SYMBOL(rdma_set_reuseaddr);
2809
2810 int rdma_set_afonly(struct rdma_cm_id *id, int afonly)
2811 {
2812 struct rdma_id_private *id_priv;
2813 unsigned long flags;
2814 int ret;
2815
2816 id_priv = container_of(id, struct rdma_id_private, id);
2817 spin_lock_irqsave(&id_priv->lock, flags);
2818 if (id_priv->state == RDMA_CM_IDLE || id_priv->state == RDMA_CM_ADDR_BOUND) {
2819 id_priv->options |= (1 << CMA_OPTION_AFONLY);
2820 id_priv->afonly = afonly;
2821 ret = 0;
2822 } else {
2823 ret = -EINVAL;
2824 }
2825 spin_unlock_irqrestore(&id_priv->lock, flags);
2826 return ret;
2827 }
2828 EXPORT_SYMBOL(rdma_set_afonly);
2829
2830 static void cma_bind_port(struct rdma_bind_list *bind_list,
2831 struct rdma_id_private *id_priv)
2832 {
2833 struct sockaddr *addr;
2834 struct sockaddr_ib *sib;
2835 u64 sid, mask;
2836 __be16 port;
2837
2838 addr = cma_src_addr(id_priv);
2839 port = htons(bind_list->port);
2840
2841 switch (addr->sa_family) {
2842 case AF_INET:
2843 ((struct sockaddr_in *) addr)->sin_port = port;
2844 break;
2845 case AF_INET6:
2846 ((struct sockaddr_in6 *) addr)->sin6_port = port;
2847 break;
2848 case AF_IB:
2849 sib = (struct sockaddr_ib *) addr;
2850 sid = be64_to_cpu(sib->sib_sid);
2851 mask = be64_to_cpu(sib->sib_sid_mask);
2852 sib->sib_sid = cpu_to_be64((sid & mask) | (u64) ntohs(port));
2853 sib->sib_sid_mask = cpu_to_be64(~0ULL);
2854 break;
2855 }
2856 id_priv->bind_list = bind_list;
2857 hlist_add_head(&id_priv->node, &bind_list->owners);
2858 }
2859
2860 static int cma_alloc_port(enum rdma_port_space ps,
2861 struct rdma_id_private *id_priv, unsigned short snum)
2862 {
2863 struct rdma_bind_list *bind_list;
2864 int ret;
2865
2866 bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL);
2867 if (!bind_list)
2868 return -ENOMEM;
2869
2870 ret = cma_ps_alloc(id_priv->id.route.addr.dev_addr.net, ps, bind_list,
2871 snum);
2872 if (ret < 0)
2873 goto err;
2874
2875 bind_list->ps = ps;
2876 bind_list->port = (unsigned short)ret;
2877 cma_bind_port(bind_list, id_priv);
2878 return 0;
2879 err:
2880 kfree(bind_list);
2881 return ret == -ENOSPC ? -EADDRNOTAVAIL : ret;
2882 }
2883
2884 static int cma_alloc_any_port(enum rdma_port_space ps,
2885 struct rdma_id_private *id_priv)
2886 {
2887 static unsigned int last_used_port;
2888 int low, high, remaining;
2889 unsigned int rover;
2890 struct net *net = id_priv->id.route.addr.dev_addr.net;
2891
2892 inet_get_local_port_range(net, &low, &high);
2893 remaining = (high - low) + 1;
2894 rover = prandom_u32() % remaining + low;
2895 retry:
2896 if (last_used_port != rover &&
2897 !cma_ps_find(net, ps, (unsigned short)rover)) {
2898 int ret = cma_alloc_port(ps, id_priv, rover);
2899 /*
2900 * Remember previously used port number in order to avoid
2901 * re-using same port immediately after it is closed.
2902 */
2903 if (!ret)
2904 last_used_port = rover;
2905 if (ret != -EADDRNOTAVAIL)
2906 return ret;
2907 }
2908 if (--remaining) {
2909 rover++;
2910 if ((rover < low) || (rover > high))
2911 rover = low;
2912 goto retry;
2913 }
2914 return -EADDRNOTAVAIL;
2915 }
2916
2917 /*
2918 * Check that the requested port is available. This is called when trying to
2919 * bind to a specific port, or when trying to listen on a bound port. In
2920 * the latter case, the provided id_priv may already be on the bind_list, but
2921 * we still need to check that it's okay to start listening.
2922 */
2923 static int cma_check_port(struct rdma_bind_list *bind_list,
2924 struct rdma_id_private *id_priv, uint8_t reuseaddr)
2925 {
2926 struct rdma_id_private *cur_id;
2927 struct sockaddr *addr, *cur_addr;
2928
2929 addr = cma_src_addr(id_priv);
2930 hlist_for_each_entry(cur_id, &bind_list->owners, node) {
2931 if (id_priv == cur_id)
2932 continue;
2933
2934 if ((cur_id->state != RDMA_CM_LISTEN) && reuseaddr &&
2935 cur_id->reuseaddr)
2936 continue;
2937
2938 cur_addr = cma_src_addr(cur_id);
2939 if (id_priv->afonly && cur_id->afonly &&
2940 (addr->sa_family != cur_addr->sa_family))
2941 continue;
2942
2943 if (cma_any_addr(addr) || cma_any_addr(cur_addr))
2944 return -EADDRNOTAVAIL;
2945
2946 if (!cma_addr_cmp(addr, cur_addr))
2947 return -EADDRINUSE;
2948 }
2949 return 0;
2950 }
2951
2952 static int cma_use_port(enum rdma_port_space ps,
2953 struct rdma_id_private *id_priv)
2954 {
2955 struct rdma_bind_list *bind_list;
2956 unsigned short snum;
2957 int ret;
2958
2959 snum = ntohs(cma_port(cma_src_addr(id_priv)));
2960 if (snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
2961 return -EACCES;
2962
2963 bind_list = cma_ps_find(id_priv->id.route.addr.dev_addr.net, ps, snum);
2964 if (!bind_list) {
2965 ret = cma_alloc_port(ps, id_priv, snum);
2966 } else {
2967 ret = cma_check_port(bind_list, id_priv, id_priv->reuseaddr);
2968 if (!ret)
2969 cma_bind_port(bind_list, id_priv);
2970 }
2971 return ret;
2972 }
2973
2974 static int cma_bind_listen(struct rdma_id_private *id_priv)
2975 {
2976 struct rdma_bind_list *bind_list = id_priv->bind_list;
2977 int ret = 0;
2978
2979 mutex_lock(&lock);
2980 if (bind_list->owners.first->next)
2981 ret = cma_check_port(bind_list, id_priv, 0);
2982 mutex_unlock(&lock);
2983 return ret;
2984 }
2985
2986 static enum rdma_port_space cma_select_inet_ps(
2987 struct rdma_id_private *id_priv)
2988 {
2989 switch (id_priv->id.ps) {
2990 case RDMA_PS_TCP:
2991 case RDMA_PS_UDP:
2992 case RDMA_PS_IPOIB:
2993 case RDMA_PS_IB:
2994 return id_priv->id.ps;
2995 default:
2996
2997 return 0;
2998 }
2999 }
3000
3001 static enum rdma_port_space cma_select_ib_ps(struct rdma_id_private *id_priv)
3002 {
3003 enum rdma_port_space ps = 0;
3004 struct sockaddr_ib *sib;
3005 u64 sid_ps, mask, sid;
3006
3007 sib = (struct sockaddr_ib *) cma_src_addr(id_priv);
3008 mask = be64_to_cpu(sib->sib_sid_mask) & RDMA_IB_IP_PS_MASK;
3009 sid = be64_to_cpu(sib->sib_sid) & mask;
3010
3011 if ((id_priv->id.ps == RDMA_PS_IB) && (sid == (RDMA_IB_IP_PS_IB & mask))) {
3012 sid_ps = RDMA_IB_IP_PS_IB;
3013 ps = RDMA_PS_IB;
3014 } else if (((id_priv->id.ps == RDMA_PS_IB) || (id_priv->id.ps == RDMA_PS_TCP)) &&
3015 (sid == (RDMA_IB_IP_PS_TCP & mask))) {
3016 sid_ps = RDMA_IB_IP_PS_TCP;
3017 ps = RDMA_PS_TCP;
3018 } else if (((id_priv->id.ps == RDMA_PS_IB) || (id_priv->id.ps == RDMA_PS_UDP)) &&
3019 (sid == (RDMA_IB_IP_PS_UDP & mask))) {
3020 sid_ps = RDMA_IB_IP_PS_UDP;
3021 ps = RDMA_PS_UDP;
3022 }
3023
3024 if (ps) {
3025 sib->sib_sid = cpu_to_be64(sid_ps | ntohs(cma_port((struct sockaddr *) sib)));
3026 sib->sib_sid_mask = cpu_to_be64(RDMA_IB_IP_PS_MASK |
3027 be64_to_cpu(sib->sib_sid_mask));
3028 }
3029 return ps;
3030 }
3031
3032 static int cma_get_port(struct rdma_id_private *id_priv)
3033 {
3034 enum rdma_port_space ps;
3035 int ret;
3036
3037 if (cma_family(id_priv) != AF_IB)
3038 ps = cma_select_inet_ps(id_priv);
3039 else
3040 ps = cma_select_ib_ps(id_priv);
3041 if (!ps)
3042 return -EPROTONOSUPPORT;
3043
3044 mutex_lock(&lock);
3045 if (cma_any_port(cma_src_addr(id_priv)))
3046 ret = cma_alloc_any_port(ps, id_priv);
3047 else
3048 ret = cma_use_port(ps, id_priv);
3049 mutex_unlock(&lock);
3050
3051 return ret;
3052 }
3053
3054 static int cma_check_linklocal(struct rdma_dev_addr *dev_addr,
3055 struct sockaddr *addr)
3056 {
3057 #if IS_ENABLED(CONFIG_IPV6)
3058 struct sockaddr_in6 *sin6;
3059
3060 if (addr->sa_family != AF_INET6)
3061 return 0;
3062
3063 sin6 = (struct sockaddr_in6 *) addr;
3064
3065 if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
3066 return 0;
3067
3068 if (!sin6->sin6_scope_id)
3069 return -EINVAL;
3070
3071 dev_addr->bound_dev_if = sin6->sin6_scope_id;
3072 #endif
3073 return 0;
3074 }
3075
3076 int rdma_listen(struct rdma_cm_id *id, int backlog)
3077 {
3078 struct rdma_id_private *id_priv;
3079 int ret;
3080
3081 id_priv = container_of(id, struct rdma_id_private, id);
3082 if (id_priv->state == RDMA_CM_IDLE) {
3083 id->route.addr.src_addr.ss_family = AF_INET;
3084 ret = rdma_bind_addr(id, cma_src_addr(id_priv));
3085 if (ret)
3086 return ret;
3087 }
3088
3089 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_LISTEN))
3090 return -EINVAL;
3091
3092 if (id_priv->reuseaddr) {
3093 ret = cma_bind_listen(id_priv);
3094 if (ret)
3095 goto err;
3096 }
3097
3098 id_priv->backlog = backlog;
3099 if (id->device) {
3100 if (rdma_cap_ib_cm(id->device, 1)) {
3101 ret = cma_ib_listen(id_priv);
3102 if (ret)
3103 goto err;
3104 } else if (rdma_cap_iw_cm(id->device, 1)) {
3105 ret = cma_iw_listen(id_priv, backlog);
3106 if (ret)
3107 goto err;
3108 } else {
3109 ret = -ENOSYS;
3110 goto err;
3111 }
3112 } else
3113 cma_listen_on_all(id_priv);
3114
3115 return 0;
3116 err:
3117 id_priv->backlog = 0;
3118 cma_comp_exch(id_priv, RDMA_CM_LISTEN, RDMA_CM_ADDR_BOUND);
3119 return ret;
3120 }
3121 EXPORT_SYMBOL(rdma_listen);
3122
3123 int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr)
3124 {
3125 struct rdma_id_private *id_priv;
3126 int ret;
3127
3128 if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6 &&
3129 addr->sa_family != AF_IB)
3130 return -EAFNOSUPPORT;
3131
3132 id_priv = container_of(id, struct rdma_id_private, id);
3133 if (!cma_comp_exch(id_priv, RDMA_CM_IDLE, RDMA_CM_ADDR_BOUND))
3134 return -EINVAL;
3135
3136 ret = cma_check_linklocal(&id->route.addr.dev_addr, addr);
3137 if (ret)
3138 goto err1;
3139
3140 memcpy(cma_src_addr(id_priv), addr, rdma_addr_size(addr));
3141 if (!cma_any_addr(addr)) {
3142 ret = cma_translate_addr(addr, &id->route.addr.dev_addr);
3143 if (ret)
3144 goto err1;
3145
3146 ret = cma_acquire_dev(id_priv, NULL);
3147 if (ret)
3148 goto err1;
3149 }
3150
3151 if (!(id_priv->options & (1 << CMA_OPTION_AFONLY))) {
3152 if (addr->sa_family == AF_INET)
3153 id_priv->afonly = 1;
3154 #if IS_ENABLED(CONFIG_IPV6)
3155 else if (addr->sa_family == AF_INET6) {
3156 struct net *net = id_priv->id.route.addr.dev_addr.net;
3157
3158 id_priv->afonly = net->ipv6.sysctl.bindv6only;
3159 }
3160 #endif
3161 }
3162 ret = cma_get_port(id_priv);
3163 if (ret)
3164 goto err2;
3165
3166 return 0;
3167 err2:
3168 if (id_priv->cma_dev)
3169 cma_release_dev(id_priv);
3170 err1:
3171 cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_IDLE);
3172 return ret;
3173 }
3174 EXPORT_SYMBOL(rdma_bind_addr);
3175
3176 static int cma_format_hdr(void *hdr, struct rdma_id_private *id_priv)
3177 {
3178 struct cma_hdr *cma_hdr;
3179
3180 cma_hdr = hdr;
3181 cma_hdr->cma_version = CMA_VERSION;
3182 if (cma_family(id_priv) == AF_INET) {
3183 struct sockaddr_in *src4, *dst4;
3184
3185 src4 = (struct sockaddr_in *) cma_src_addr(id_priv);
3186 dst4 = (struct sockaddr_in *) cma_dst_addr(id_priv);
3187
3188 cma_set_ip_ver(cma_hdr, 4);
3189 cma_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
3190 cma_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
3191 cma_hdr->port = src4->sin_port;
3192 } else if (cma_family(id_priv) == AF_INET6) {
3193 struct sockaddr_in6 *src6, *dst6;
3194
3195 src6 = (struct sockaddr_in6 *) cma_src_addr(id_priv);
3196 dst6 = (struct sockaddr_in6 *) cma_dst_addr(id_priv);
3197
3198 cma_set_ip_ver(cma_hdr, 6);
3199 cma_hdr->src_addr.ip6 = src6->sin6_addr;
3200 cma_hdr->dst_addr.ip6 = dst6->sin6_addr;
3201 cma_hdr->port = src6->sin6_port;
3202 }
3203 return 0;
3204 }
3205
3206 static int cma_sidr_rep_handler(struct ib_cm_id *cm_id,
3207 struct ib_cm_event *ib_event)
3208 {
3209 struct rdma_id_private *id_priv = cm_id->context;
3210 struct rdma_cm_event event;
3211 struct ib_cm_sidr_rep_event_param *rep = &ib_event->param.sidr_rep_rcvd;
3212 int ret = 0;
3213
3214 mutex_lock(&id_priv->handler_mutex);
3215 if (id_priv->state != RDMA_CM_CONNECT)
3216 goto out;
3217
3218 memset(&event, 0, sizeof event);
3219 switch (ib_event->event) {
3220 case IB_CM_SIDR_REQ_ERROR:
3221 event.event = RDMA_CM_EVENT_UNREACHABLE;
3222 event.status = -ETIMEDOUT;
3223 break;
3224 case IB_CM_SIDR_REP_RECEIVED:
3225 event.param.ud.private_data = ib_event->private_data;
3226 event.param.ud.private_data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
3227 if (rep->status != IB_SIDR_SUCCESS) {
3228 event.event = RDMA_CM_EVENT_UNREACHABLE;
3229 event.status = ib_event->param.sidr_rep_rcvd.status;
3230 break;
3231 }
3232 ret = cma_set_qkey(id_priv, rep->qkey);
3233 if (ret) {
3234 event.event = RDMA_CM_EVENT_ADDR_ERROR;
3235 event.status = ret;
3236 break;
3237 }
3238 ib_init_ah_from_path(id_priv->id.device, id_priv->id.port_num,
3239 id_priv->id.route.path_rec,
3240 &event.param.ud.ah_attr);
3241 event.param.ud.qp_num = rep->qpn;
3242 event.param.ud.qkey = rep->qkey;
3243 event.event = RDMA_CM_EVENT_ESTABLISHED;
3244 event.status = 0;
3245 break;
3246 default:
3247 pr_err("RDMA CMA: unexpected IB CM event: %d\n",
3248 ib_event->event);
3249 goto out;
3250 }
3251
3252 ret = id_priv->id.event_handler(&id_priv->id, &event);
3253 if (ret) {
3254 /* Destroy the CM ID by returning a non-zero value. */
3255 id_priv->cm_id.ib = NULL;
3256 cma_exch(id_priv, RDMA_CM_DESTROYING);
3257 mutex_unlock(&id_priv->handler_mutex);
3258 rdma_destroy_id(&id_priv->id);
3259 return ret;
3260 }
3261 out:
3262 mutex_unlock(&id_priv->handler_mutex);
3263 return ret;
3264 }
3265
3266 static int cma_resolve_ib_udp(struct rdma_id_private *id_priv,
3267 struct rdma_conn_param *conn_param)
3268 {
3269 struct ib_cm_sidr_req_param req;
3270 struct ib_cm_id *id;
3271 void *private_data;
3272 int offset, ret;
3273
3274 memset(&req, 0, sizeof req);
3275 offset = cma_user_data_offset(id_priv);
3276 req.private_data_len = offset + conn_param->private_data_len;
3277 if (req.private_data_len < conn_param->private_data_len)
3278 return -EINVAL;
3279
3280 if (req.private_data_len) {
3281 private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
3282 if (!private_data)
3283 return -ENOMEM;
3284 } else {
3285 private_data = NULL;
3286 }
3287
3288 if (conn_param->private_data && conn_param->private_data_len)
3289 memcpy(private_data + offset, conn_param->private_data,
3290 conn_param->private_data_len);
3291
3292 if (private_data) {
3293 ret = cma_format_hdr(private_data, id_priv);
3294 if (ret)
3295 goto out;
3296 req.private_data = private_data;
3297 }
3298
3299 id = ib_create_cm_id(id_priv->id.device, cma_sidr_rep_handler,
3300 id_priv);
3301 if (IS_ERR(id)) {
3302 ret = PTR_ERR(id);
3303 goto out;
3304 }
3305 id_priv->cm_id.ib = id;
3306
3307 req.path = id_priv->id.route.path_rec;
3308 req.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
3309 req.timeout_ms = 1 << (CMA_CM_RESPONSE_TIMEOUT - 8);
3310 req.max_cm_retries = CMA_MAX_CM_RETRIES;
3311
3312 ret = ib_send_cm_sidr_req(id_priv->cm_id.ib, &req);
3313 if (ret) {
3314 ib_destroy_cm_id(id_priv->cm_id.ib);
3315 id_priv->cm_id.ib = NULL;
3316 }
3317 out:
3318 kfree(private_data);
3319 return ret;
3320 }
3321
3322 static int cma_connect_ib(struct rdma_id_private *id_priv,
3323 struct rdma_conn_param *conn_param)
3324 {
3325 struct ib_cm_req_param req;
3326 struct rdma_route *route;
3327 void *private_data;
3328 struct ib_cm_id *id;
3329 int offset, ret;
3330
3331 memset(&req, 0, sizeof req);
3332 offset = cma_user_data_offset(id_priv);
3333 req.private_data_len = offset + conn_param->private_data_len;
3334 if (req.private_data_len < conn_param->private_data_len)
3335 return -EINVAL;
3336
3337 if (req.private_data_len) {
3338 private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
3339 if (!private_data)
3340 return -ENOMEM;
3341 } else {
3342 private_data = NULL;
3343 }
3344
3345 if (conn_param->private_data && conn_param->private_data_len)
3346 memcpy(private_data + offset, conn_param->private_data,
3347 conn_param->private_data_len);
3348
3349 id = ib_create_cm_id(id_priv->id.device, cma_ib_handler, id_priv);
3350 if (IS_ERR(id)) {
3351 ret = PTR_ERR(id);
3352 goto out;
3353 }
3354 id_priv->cm_id.ib = id;
3355
3356 route = &id_priv->id.route;
3357 if (private_data) {
3358 ret = cma_format_hdr(private_data, id_priv);
3359 if (ret)
3360 goto out;
3361 req.private_data = private_data;
3362 }
3363
3364 req.primary_path = &route->path_rec[0];
3365 if (route->num_paths == 2)
3366 req.alternate_path = &route->path_rec[1];
3367
3368 req.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
3369 req.qp_num = id_priv->qp_num;
3370 req.qp_type = id_priv->id.qp_type;
3371 req.starting_psn = id_priv->seq_num;
3372 req.responder_resources = conn_param->responder_resources;
3373 req.initiator_depth = conn_param->initiator_depth;
3374 req.flow_control = conn_param->flow_control;
3375 req.retry_count = min_t(u8, 7, conn_param->retry_count);
3376 req.rnr_retry_count = min_t(u8, 7, conn_param->rnr_retry_count);
3377 req.remote_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
3378 req.local_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
3379 req.max_cm_retries = CMA_MAX_CM_RETRIES;
3380 req.srq = id_priv->srq ? 1 : 0;
3381
3382 ret = ib_send_cm_req(id_priv->cm_id.ib, &req);
3383 out:
3384 if (ret && !IS_ERR(id)) {
3385 ib_destroy_cm_id(id);
3386 id_priv->cm_id.ib = NULL;
3387 }
3388
3389 kfree(private_data);
3390 return ret;
3391 }
3392
3393 static int cma_connect_iw(struct rdma_id_private *id_priv,
3394 struct rdma_conn_param *conn_param)
3395 {
3396 struct iw_cm_id *cm_id;
3397 int ret;
3398 struct iw_cm_conn_param iw_param;
3399
3400 cm_id = iw_create_cm_id(id_priv->id.device, cma_iw_handler, id_priv);
3401 if (IS_ERR(cm_id))
3402 return PTR_ERR(cm_id);
3403
3404 cm_id->tos = id_priv->tos;
3405 id_priv->cm_id.iw = cm_id;
3406
3407 memcpy(&cm_id->local_addr, cma_src_addr(id_priv),
3408 rdma_addr_size(cma_src_addr(id_priv)));
3409 memcpy(&cm_id->remote_addr, cma_dst_addr(id_priv),
3410 rdma_addr_size(cma_dst_addr(id_priv)));
3411
3412 ret = cma_modify_qp_rtr(id_priv, conn_param);
3413 if (ret)
3414 goto out;
3415
3416 if (conn_param) {
3417 iw_param.ord = conn_param->initiator_depth;
3418 iw_param.ird = conn_param->responder_resources;
3419 iw_param.private_data = conn_param->private_data;
3420 iw_param.private_data_len = conn_param->private_data_len;
3421 iw_param.qpn = id_priv->id.qp ? id_priv->qp_num : conn_param->qp_num;
3422 } else {
3423 memset(&iw_param, 0, sizeof iw_param);
3424 iw_param.qpn = id_priv->qp_num;
3425 }
3426 ret = iw_cm_connect(cm_id, &iw_param);
3427 out:
3428 if (ret) {
3429 iw_destroy_cm_id(cm_id);
3430 id_priv->cm_id.iw = NULL;
3431 }
3432 return ret;
3433 }
3434
3435 int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
3436 {
3437 struct rdma_id_private *id_priv;
3438 int ret;
3439
3440 id_priv = container_of(id, struct rdma_id_private, id);
3441 if (!cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_CONNECT))
3442 return -EINVAL;
3443
3444 if (!id->qp) {
3445 id_priv->qp_num = conn_param->qp_num;
3446 id_priv->srq = conn_param->srq;
3447 }
3448
3449 if (rdma_cap_ib_cm(id->device, id->port_num)) {
3450 if (id->qp_type == IB_QPT_UD)
3451 ret = cma_resolve_ib_udp(id_priv, conn_param);
3452 else
3453 ret = cma_connect_ib(id_priv, conn_param);
3454 } else if (rdma_cap_iw_cm(id->device, id->port_num))
3455 ret = cma_connect_iw(id_priv, conn_param);
3456 else
3457 ret = -ENOSYS;
3458 if (ret)
3459 goto err;
3460
3461 return 0;
3462 err:
3463 cma_comp_exch(id_priv, RDMA_CM_CONNECT, RDMA_CM_ROUTE_RESOLVED);
3464 return ret;
3465 }
3466 EXPORT_SYMBOL(rdma_connect);
3467
3468 static int cma_accept_ib(struct rdma_id_private *id_priv,
3469 struct rdma_conn_param *conn_param)
3470 {
3471 struct ib_cm_rep_param rep;
3472 int ret;
3473
3474 ret = cma_modify_qp_rtr(id_priv, conn_param);
3475 if (ret)
3476 goto out;
3477
3478 ret = cma_modify_qp_rts(id_priv, conn_param);
3479 if (ret)
3480 goto out;
3481
3482 memset(&rep, 0, sizeof rep);
3483 rep.qp_num = id_priv->qp_num;
3484 rep.starting_psn = id_priv->seq_num;
3485 rep.private_data = conn_param->private_data;
3486 rep.private_data_len = conn_param->private_data_len;
3487 rep.responder_resources = conn_param->responder_resources;
3488 rep.initiator_depth = conn_param->initiator_depth;
3489 rep.failover_accepted = 0;
3490 rep.flow_control = conn_param->flow_control;
3491 rep.rnr_retry_count = min_t(u8, 7, conn_param->rnr_retry_count);
3492 rep.srq = id_priv->srq ? 1 : 0;
3493
3494 ret = ib_send_cm_rep(id_priv->cm_id.ib, &rep);
3495 out:
3496 return ret;
3497 }
3498
3499 static int cma_accept_iw(struct rdma_id_private *id_priv,
3500 struct rdma_conn_param *conn_param)
3501 {
3502 struct iw_cm_conn_param iw_param;
3503 int ret;
3504
3505 ret = cma_modify_qp_rtr(id_priv, conn_param);
3506 if (ret)
3507 return ret;
3508
3509 iw_param.ord = conn_param->initiator_depth;
3510 iw_param.ird = conn_param->responder_resources;
3511 iw_param.private_data = conn_param->private_data;
3512 iw_param.private_data_len = conn_param->private_data_len;
3513 if (id_priv->id.qp) {
3514 iw_param.qpn = id_priv->qp_num;
3515 } else
3516 iw_param.qpn = conn_param->qp_num;
3517
3518 return iw_cm_accept(id_priv->cm_id.iw, &iw_param);
3519 }
3520
3521 static int cma_send_sidr_rep(struct rdma_id_private *id_priv,
3522 enum ib_cm_sidr_status status, u32 qkey,
3523 const void *private_data, int private_data_len)
3524 {
3525 struct ib_cm_sidr_rep_param rep;
3526 int ret;
3527
3528 memset(&rep, 0, sizeof rep);
3529 rep.status = status;
3530 if (status == IB_SIDR_SUCCESS) {
3531 ret = cma_set_qkey(id_priv, qkey);
3532 if (ret)
3533 return ret;
3534 rep.qp_num = id_priv->qp_num;
3535 rep.qkey = id_priv->qkey;
3536 }
3537 rep.private_data = private_data;
3538 rep.private_data_len = private_data_len;
3539
3540 return ib_send_cm_sidr_rep(id_priv->cm_id.ib, &rep);
3541 }
3542
3543 int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
3544 {
3545 struct rdma_id_private *id_priv;
3546 int ret;
3547
3548 id_priv = container_of(id, struct rdma_id_private, id);
3549
3550 id_priv->owner = task_pid_nr(current);
3551
3552 if (!cma_comp(id_priv, RDMA_CM_CONNECT))
3553 return -EINVAL;
3554
3555 if (!id->qp && conn_param) {
3556 id_priv->qp_num = conn_param->qp_num;
3557 id_priv->srq = conn_param->srq;
3558 }
3559
3560 if (rdma_cap_ib_cm(id->device, id->port_num)) {
3561 if (id->qp_type == IB_QPT_UD) {
3562 if (conn_param)
3563 ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
3564 conn_param->qkey,
3565 conn_param->private_data,
3566 conn_param->private_data_len);
3567 else
3568 ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
3569 0, NULL, 0);
3570 } else {
3571 if (conn_param)
3572 ret = cma_accept_ib(id_priv, conn_param);
3573 else
3574 ret = cma_rep_recv(id_priv);
3575 }
3576 } else if (rdma_cap_iw_cm(id->device, id->port_num))
3577 ret = cma_accept_iw(id_priv, conn_param);
3578 else
3579 ret = -ENOSYS;
3580
3581 if (ret)
3582 goto reject;
3583
3584 return 0;
3585 reject:
3586 cma_modify_qp_err(id_priv);
3587 rdma_reject(id, NULL, 0);
3588 return ret;
3589 }
3590 EXPORT_SYMBOL(rdma_accept);
3591
3592 int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event)
3593 {
3594 struct rdma_id_private *id_priv;
3595 int ret;
3596
3597 id_priv = container_of(id, struct rdma_id_private, id);
3598 if (!id_priv->cm_id.ib)
3599 return -EINVAL;
3600
3601 switch (id->device->node_type) {
3602 case RDMA_NODE_IB_CA:
3603 ret = ib_cm_notify(id_priv->cm_id.ib, event);
3604 break;
3605 default:
3606 ret = 0;
3607 break;
3608 }
3609 return ret;
3610 }
3611 EXPORT_SYMBOL(rdma_notify);
3612
3613 int rdma_reject(struct rdma_cm_id *id, const void *private_data,
3614 u8 private_data_len)
3615 {
3616 struct rdma_id_private *id_priv;
3617 int ret;
3618
3619 id_priv = container_of(id, struct rdma_id_private, id);
3620 if (!id_priv->cm_id.ib)
3621 return -EINVAL;
3622
3623 if (rdma_cap_ib_cm(id->device, id->port_num)) {
3624 if (id->qp_type == IB_QPT_UD)
3625 ret = cma_send_sidr_rep(id_priv, IB_SIDR_REJECT, 0,
3626 private_data, private_data_len);
3627 else
3628 ret = ib_send_cm_rej(id_priv->cm_id.ib,
3629 IB_CM_REJ_CONSUMER_DEFINED, NULL,
3630 0, private_data, private_data_len);
3631 } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
3632 ret = iw_cm_reject(id_priv->cm_id.iw,
3633 private_data, private_data_len);
3634 } else
3635 ret = -ENOSYS;
3636
3637 return ret;
3638 }
3639 EXPORT_SYMBOL(rdma_reject);
3640
3641 int rdma_disconnect(struct rdma_cm_id *id)
3642 {
3643 struct rdma_id_private *id_priv;
3644 int ret;
3645
3646 id_priv = container_of(id, struct rdma_id_private, id);
3647 if (!id_priv->cm_id.ib)
3648 return -EINVAL;
3649
3650 if (rdma_cap_ib_cm(id->device, id->port_num)) {
3651 ret = cma_modify_qp_err(id_priv);
3652 if (ret)
3653 goto out;
3654 /* Initiate or respond to a disconnect. */
3655 if (ib_send_cm_dreq(id_priv->cm_id.ib, NULL, 0))
3656 ib_send_cm_drep(id_priv->cm_id.ib, NULL, 0);
3657 } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
3658 ret = iw_cm_disconnect(id_priv->cm_id.iw, 0);
3659 } else
3660 ret = -EINVAL;
3661
3662 out:
3663 return ret;
3664 }
3665 EXPORT_SYMBOL(rdma_disconnect);
3666
3667 static int cma_ib_mc_handler(int status, struct ib_sa_multicast *multicast)
3668 {
3669 struct rdma_id_private *id_priv;
3670 struct cma_multicast *mc = multicast->context;
3671 struct rdma_cm_event event;
3672 int ret = 0;
3673
3674 id_priv = mc->id_priv;
3675 mutex_lock(&id_priv->handler_mutex);
3676 if (id_priv->state != RDMA_CM_ADDR_BOUND &&
3677 id_priv->state != RDMA_CM_ADDR_RESOLVED)
3678 goto out;
3679
3680 if (!status)
3681 status = cma_set_qkey(id_priv, be32_to_cpu(multicast->rec.qkey));
3682 mutex_lock(&id_priv->qp_mutex);
3683 if (!status && id_priv->id.qp)
3684 status = ib_attach_mcast(id_priv->id.qp, &multicast->rec.mgid,
3685 be16_to_cpu(multicast->rec.mlid));
3686 mutex_unlock(&id_priv->qp_mutex);
3687
3688 memset(&event, 0, sizeof event);
3689 event.status = status;
3690 event.param.ud.private_data = mc->context;
3691 if (!status) {
3692 struct rdma_dev_addr *dev_addr =
3693 &id_priv->id.route.addr.dev_addr;
3694 struct net_device *ndev =
3695 dev_get_by_index(&init_net, dev_addr->bound_dev_if);
3696 enum ib_gid_type gid_type =
3697 id_priv->cma_dev->default_gid_type[id_priv->id.port_num -
3698 rdma_start_port(id_priv->cma_dev->device)];
3699
3700 event.event = RDMA_CM_EVENT_MULTICAST_JOIN;
3701 ib_init_ah_from_mcmember(id_priv->id.device,
3702 id_priv->id.port_num, &multicast->rec,
3703 ndev, gid_type,
3704 &event.param.ud.ah_attr);
3705 event.param.ud.qp_num = 0xFFFFFF;
3706 event.param.ud.qkey = be32_to_cpu(multicast->rec.qkey);
3707 if (ndev)
3708 dev_put(ndev);
3709 } else
3710 event.event = RDMA_CM_EVENT_MULTICAST_ERROR;
3711
3712 ret = id_priv->id.event_handler(&id_priv->id, &event);
3713 if (ret) {
3714 cma_exch(id_priv, RDMA_CM_DESTROYING);
3715 mutex_unlock(&id_priv->handler_mutex);
3716 rdma_destroy_id(&id_priv->id);
3717 return 0;
3718 }
3719
3720 out:
3721 mutex_unlock(&id_priv->handler_mutex);
3722 return 0;
3723 }
3724
3725 static void cma_set_mgid(struct rdma_id_private *id_priv,
3726 struct sockaddr *addr, union ib_gid *mgid)
3727 {
3728 unsigned char mc_map[MAX_ADDR_LEN];
3729 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
3730 struct sockaddr_in *sin = (struct sockaddr_in *) addr;
3731 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) addr;
3732
3733 if (cma_any_addr(addr)) {
3734 memset(mgid, 0, sizeof *mgid);
3735 } else if ((addr->sa_family == AF_INET6) &&
3736 ((be32_to_cpu(sin6->sin6_addr.s6_addr32[0]) & 0xFFF0FFFF) ==
3737 0xFF10A01B)) {
3738 /* IPv6 address is an SA assigned MGID. */
3739 memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
3740 } else if (addr->sa_family == AF_IB) {
3741 memcpy(mgid, &((struct sockaddr_ib *) addr)->sib_addr, sizeof *mgid);
3742 } else if ((addr->sa_family == AF_INET6)) {
3743 ipv6_ib_mc_map(&sin6->sin6_addr, dev_addr->broadcast, mc_map);
3744 if (id_priv->id.ps == RDMA_PS_UDP)
3745 mc_map[7] = 0x01; /* Use RDMA CM signature */
3746 *mgid = *(union ib_gid *) (mc_map + 4);
3747 } else {
3748 ip_ib_mc_map(sin->sin_addr.s_addr, dev_addr->broadcast, mc_map);
3749 if (id_priv->id.ps == RDMA_PS_UDP)
3750 mc_map[7] = 0x01; /* Use RDMA CM signature */
3751 *mgid = *(union ib_gid *) (mc_map + 4);
3752 }
3753 }
3754
3755 static int cma_join_ib_multicast(struct rdma_id_private *id_priv,
3756 struct cma_multicast *mc)
3757 {
3758 struct ib_sa_mcmember_rec rec;
3759 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
3760 ib_sa_comp_mask comp_mask;
3761 int ret;
3762
3763 ib_addr_get_mgid(dev_addr, &rec.mgid);
3764 ret = ib_sa_get_mcmember_rec(id_priv->id.device, id_priv->id.port_num,
3765 &rec.mgid, &rec);
3766 if (ret)
3767 return ret;
3768
3769 ret = cma_set_qkey(id_priv, 0);
3770 if (ret)
3771 return ret;
3772
3773 cma_set_mgid(id_priv, (struct sockaddr *) &mc->addr, &rec.mgid);
3774 rec.qkey = cpu_to_be32(id_priv->qkey);
3775 rdma_addr_get_sgid(dev_addr, &rec.port_gid);
3776 rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
3777 rec.join_state = 1;
3778
3779 comp_mask = IB_SA_MCMEMBER_REC_MGID | IB_SA_MCMEMBER_REC_PORT_GID |
3780 IB_SA_MCMEMBER_REC_PKEY | IB_SA_MCMEMBER_REC_JOIN_STATE |
3781 IB_SA_MCMEMBER_REC_QKEY | IB_SA_MCMEMBER_REC_SL |
3782 IB_SA_MCMEMBER_REC_FLOW_LABEL |
3783 IB_SA_MCMEMBER_REC_TRAFFIC_CLASS;
3784
3785 if (id_priv->id.ps == RDMA_PS_IPOIB)
3786 comp_mask |= IB_SA_MCMEMBER_REC_RATE |
3787 IB_SA_MCMEMBER_REC_RATE_SELECTOR |
3788 IB_SA_MCMEMBER_REC_MTU_SELECTOR |
3789 IB_SA_MCMEMBER_REC_MTU |
3790 IB_SA_MCMEMBER_REC_HOP_LIMIT;
3791
3792 mc->multicast.ib = ib_sa_join_multicast(&sa_client, id_priv->id.device,
3793 id_priv->id.port_num, &rec,
3794 comp_mask, GFP_KERNEL,
3795 cma_ib_mc_handler, mc);
3796 return PTR_ERR_OR_ZERO(mc->multicast.ib);
3797 }
3798
3799 static void iboe_mcast_work_handler(struct work_struct *work)
3800 {
3801 struct iboe_mcast_work *mw = container_of(work, struct iboe_mcast_work, work);
3802 struct cma_multicast *mc = mw->mc;
3803 struct ib_sa_multicast *m = mc->multicast.ib;
3804
3805 mc->multicast.ib->context = mc;
3806 cma_ib_mc_handler(0, m);
3807 kref_put(&mc->mcref, release_mc);
3808 kfree(mw);
3809 }
3810
3811 static void cma_iboe_set_mgid(struct sockaddr *addr, union ib_gid *mgid)
3812 {
3813 struct sockaddr_in *sin = (struct sockaddr_in *)addr;
3814 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr;
3815
3816 if (cma_any_addr(addr)) {
3817 memset(mgid, 0, sizeof *mgid);
3818 } else if (addr->sa_family == AF_INET6) {
3819 memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
3820 } else {
3821 mgid->raw[0] = 0xff;
3822 mgid->raw[1] = 0x0e;
3823 mgid->raw[2] = 0;
3824 mgid->raw[3] = 0;
3825 mgid->raw[4] = 0;
3826 mgid->raw[5] = 0;
3827 mgid->raw[6] = 0;
3828 mgid->raw[7] = 0;
3829 mgid->raw[8] = 0;
3830 mgid->raw[9] = 0;
3831 mgid->raw[10] = 0xff;
3832 mgid->raw[11] = 0xff;
3833 *(__be32 *)(&mgid->raw[12]) = sin->sin_addr.s_addr;
3834 }
3835 }
3836
3837 static int cma_iboe_join_multicast(struct rdma_id_private *id_priv,
3838 struct cma_multicast *mc)
3839 {
3840 struct iboe_mcast_work *work;
3841 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
3842 int err = 0;
3843 struct sockaddr *addr = (struct sockaddr *)&mc->addr;
3844 struct net_device *ndev = NULL;
3845 enum ib_gid_type gid_type;
3846
3847 if (cma_zero_addr((struct sockaddr *)&mc->addr))
3848 return -EINVAL;
3849
3850 work = kzalloc(sizeof *work, GFP_KERNEL);
3851 if (!work)
3852 return -ENOMEM;
3853
3854 mc->multicast.ib = kzalloc(sizeof(struct ib_sa_multicast), GFP_KERNEL);
3855 if (!mc->multicast.ib) {
3856 err = -ENOMEM;
3857 goto out1;
3858 }
3859
3860 cma_iboe_set_mgid(addr, &mc->multicast.ib->rec.mgid);
3861
3862 mc->multicast.ib->rec.pkey = cpu_to_be16(0xffff);
3863 if (id_priv->id.ps == RDMA_PS_UDP)
3864 mc->multicast.ib->rec.qkey = cpu_to_be32(RDMA_UDP_QKEY);
3865
3866 if (dev_addr->bound_dev_if)
3867 ndev = dev_get_by_index(&init_net, dev_addr->bound_dev_if);
3868 if (!ndev) {
3869 err = -ENODEV;
3870 goto out2;
3871 }
3872 mc->multicast.ib->rec.rate = iboe_get_rate(ndev);
3873 mc->multicast.ib->rec.hop_limit = 1;
3874 mc->multicast.ib->rec.mtu = iboe_get_mtu(ndev->mtu);
3875
3876 gid_type = id_priv->cma_dev->default_gid_type[id_priv->id.port_num -
3877 rdma_start_port(id_priv->cma_dev->device)];
3878 if (addr->sa_family == AF_INET) {
3879 if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) {
3880 mc->multicast.ib->rec.hop_limit = IPV6_DEFAULT_HOPLIMIT;
3881 err = cma_igmp_send(ndev, &mc->multicast.ib->rec.mgid,
3882 true);
3883 if (!err)
3884 mc->igmp_joined = true;
3885 }
3886 } else {
3887 if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP)
3888 err = -ENOTSUPP;
3889 }
3890 dev_put(ndev);
3891 if (err || !mc->multicast.ib->rec.mtu) {
3892 if (!err)
3893 err = -EINVAL;
3894 goto out2;
3895 }
3896 rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
3897 &mc->multicast.ib->rec.port_gid);
3898 work->id = id_priv;
3899 work->mc = mc;
3900 INIT_WORK(&work->work, iboe_mcast_work_handler);
3901 kref_get(&mc->mcref);
3902 queue_work(cma_wq, &work->work);
3903
3904 return 0;
3905
3906 out2:
3907 kfree(mc->multicast.ib);
3908 out1:
3909 kfree(work);
3910 return err;
3911 }
3912
3913 int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
3914 void *context)
3915 {
3916 struct rdma_id_private *id_priv;
3917 struct cma_multicast *mc;
3918 int ret;
3919
3920 id_priv = container_of(id, struct rdma_id_private, id);
3921 if (!cma_comp(id_priv, RDMA_CM_ADDR_BOUND) &&
3922 !cma_comp(id_priv, RDMA_CM_ADDR_RESOLVED))
3923 return -EINVAL;
3924
3925 mc = kmalloc(sizeof *mc, GFP_KERNEL);
3926 if (!mc)
3927 return -ENOMEM;
3928
3929 memcpy(&mc->addr, addr, rdma_addr_size(addr));
3930 mc->context = context;
3931 mc->id_priv = id_priv;
3932 mc->igmp_joined = false;
3933 spin_lock(&id_priv->lock);
3934 list_add(&mc->list, &id_priv->mc_list);
3935 spin_unlock(&id_priv->lock);
3936
3937 if (rdma_protocol_roce(id->device, id->port_num)) {
3938 kref_init(&mc->mcref);
3939 ret = cma_iboe_join_multicast(id_priv, mc);
3940 } else if (rdma_cap_ib_mcast(id->device, id->port_num))
3941 ret = cma_join_ib_multicast(id_priv, mc);
3942 else
3943 ret = -ENOSYS;
3944
3945 if (ret) {
3946 spin_lock_irq(&id_priv->lock);
3947 list_del(&mc->list);
3948 spin_unlock_irq(&id_priv->lock);
3949 kfree(mc);
3950 }
3951 return ret;
3952 }
3953 EXPORT_SYMBOL(rdma_join_multicast);
3954
3955 void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr)
3956 {
3957 struct rdma_id_private *id_priv;
3958 struct cma_multicast *mc;
3959
3960 id_priv = container_of(id, struct rdma_id_private, id);
3961 spin_lock_irq(&id_priv->lock);
3962 list_for_each_entry(mc, &id_priv->mc_list, list) {
3963 if (!memcmp(&mc->addr, addr, rdma_addr_size(addr))) {
3964 list_del(&mc->list);
3965 spin_unlock_irq(&id_priv->lock);
3966
3967 if (id->qp)
3968 ib_detach_mcast(id->qp,
3969 &mc->multicast.ib->rec.mgid,
3970 be16_to_cpu(mc->multicast.ib->rec.mlid));
3971
3972 BUG_ON(id_priv->cma_dev->device != id->device);
3973
3974 if (rdma_cap_ib_mcast(id->device, id->port_num)) {
3975 ib_sa_free_multicast(mc->multicast.ib);
3976 kfree(mc);
3977 } else if (rdma_protocol_roce(id->device, id->port_num)) {
3978 if (mc->igmp_joined) {
3979 struct rdma_dev_addr *dev_addr =
3980 &id->route.addr.dev_addr;
3981 struct net_device *ndev = NULL;
3982
3983 if (dev_addr->bound_dev_if)
3984 ndev = dev_get_by_index(&init_net,
3985 dev_addr->bound_dev_if);
3986 if (ndev) {
3987 cma_igmp_send(ndev,
3988 &mc->multicast.ib->rec.mgid,
3989 false);
3990 dev_put(ndev);
3991 }
3992 mc->igmp_joined = false;
3993 }
3994 kref_put(&mc->mcref, release_mc);
3995 }
3996 return;
3997 }
3998 }
3999 spin_unlock_irq(&id_priv->lock);
4000 }
4001 EXPORT_SYMBOL(rdma_leave_multicast);
4002
4003 static int cma_netdev_change(struct net_device *ndev, struct rdma_id_private *id_priv)
4004 {
4005 struct rdma_dev_addr *dev_addr;
4006 struct cma_ndev_work *work;
4007
4008 dev_addr = &id_priv->id.route.addr.dev_addr;
4009
4010 if ((dev_addr->bound_dev_if == ndev->ifindex) &&
4011 (net_eq(dev_net(ndev), dev_addr->net)) &&
4012 memcmp(dev_addr->src_dev_addr, ndev->dev_addr, ndev->addr_len)) {
4013 pr_info("RDMA CM addr change for ndev %s used by id %p\n",
4014 ndev->name, &id_priv->id);
4015 work = kzalloc(sizeof *work, GFP_KERNEL);
4016 if (!work)
4017 return -ENOMEM;
4018
4019 INIT_WORK(&work->work, cma_ndev_work_handler);
4020 work->id = id_priv;
4021 work->event.event = RDMA_CM_EVENT_ADDR_CHANGE;
4022 atomic_inc(&id_priv->refcount);
4023 queue_work(cma_wq, &work->work);
4024 }
4025
4026 return 0;
4027 }
4028
4029 static int cma_netdev_callback(struct notifier_block *self, unsigned long event,
4030 void *ptr)
4031 {
4032 struct net_device *ndev = netdev_notifier_info_to_dev(ptr);
4033 struct cma_device *cma_dev;
4034 struct rdma_id_private *id_priv;
4035 int ret = NOTIFY_DONE;
4036
4037 if (event != NETDEV_BONDING_FAILOVER)
4038 return NOTIFY_DONE;
4039
4040 if (!(ndev->flags & IFF_MASTER) || !(ndev->priv_flags & IFF_BONDING))
4041 return NOTIFY_DONE;
4042
4043 mutex_lock(&lock);
4044 list_for_each_entry(cma_dev, &dev_list, list)
4045 list_for_each_entry(id_priv, &cma_dev->id_list, list) {
4046 ret = cma_netdev_change(ndev, id_priv);
4047 if (ret)
4048 goto out;
4049 }
4050
4051 out:
4052 mutex_unlock(&lock);
4053 return ret;
4054 }
4055
4056 static struct notifier_block cma_nb = {
4057 .notifier_call = cma_netdev_callback
4058 };
4059
4060 static void cma_add_one(struct ib_device *device)
4061 {
4062 struct cma_device *cma_dev;
4063 struct rdma_id_private *id_priv;
4064 unsigned int i;
4065 unsigned long supported_gids = 0;
4066
4067 cma_dev = kmalloc(sizeof *cma_dev, GFP_KERNEL);
4068 if (!cma_dev)
4069 return;
4070
4071 cma_dev->device = device;
4072 cma_dev->default_gid_type = kcalloc(device->phys_port_cnt,
4073 sizeof(*cma_dev->default_gid_type),
4074 GFP_KERNEL);
4075 if (!cma_dev->default_gid_type) {
4076 kfree(cma_dev);
4077 return;
4078 }
4079 for (i = rdma_start_port(device); i <= rdma_end_port(device); i++) {
4080 supported_gids = roce_gid_type_mask_support(device, i);
4081 WARN_ON(!supported_gids);
4082 cma_dev->default_gid_type[i - rdma_start_port(device)] =
4083 find_first_bit(&supported_gids, BITS_PER_LONG);
4084 }
4085
4086 init_completion(&cma_dev->comp);
4087 atomic_set(&cma_dev->refcount, 1);
4088 INIT_LIST_HEAD(&cma_dev->id_list);
4089 ib_set_client_data(device, &cma_client, cma_dev);
4090
4091 mutex_lock(&lock);
4092 list_add_tail(&cma_dev->list, &dev_list);
4093 list_for_each_entry(id_priv, &listen_any_list, list)
4094 cma_listen_on_dev(id_priv, cma_dev);
4095 mutex_unlock(&lock);
4096 }
4097
4098 static int cma_remove_id_dev(struct rdma_id_private *id_priv)
4099 {
4100 struct rdma_cm_event event;
4101 enum rdma_cm_state state;
4102 int ret = 0;
4103
4104 /* Record that we want to remove the device */
4105 state = cma_exch(id_priv, RDMA_CM_DEVICE_REMOVAL);
4106 if (state == RDMA_CM_DESTROYING)
4107 return 0;
4108
4109 cma_cancel_operation(id_priv, state);
4110 mutex_lock(&id_priv->handler_mutex);
4111
4112 /* Check for destruction from another callback. */
4113 if (!cma_comp(id_priv, RDMA_CM_DEVICE_REMOVAL))
4114 goto out;
4115
4116 memset(&event, 0, sizeof event);
4117 event.event = RDMA_CM_EVENT_DEVICE_REMOVAL;
4118 ret = id_priv->id.event_handler(&id_priv->id, &event);
4119 out:
4120 mutex_unlock(&id_priv->handler_mutex);
4121 return ret;
4122 }
4123
4124 static void cma_process_remove(struct cma_device *cma_dev)
4125 {
4126 struct rdma_id_private *id_priv;
4127 int ret;
4128
4129 mutex_lock(&lock);
4130 while (!list_empty(&cma_dev->id_list)) {
4131 id_priv = list_entry(cma_dev->id_list.next,
4132 struct rdma_id_private, list);
4133
4134 list_del(&id_priv->listen_list);
4135 list_del_init(&id_priv->list);
4136 atomic_inc(&id_priv->refcount);
4137 mutex_unlock(&lock);
4138
4139 ret = id_priv->internal_id ? 1 : cma_remove_id_dev(id_priv);
4140 cma_deref_id(id_priv);
4141 if (ret)
4142 rdma_destroy_id(&id_priv->id);
4143
4144 mutex_lock(&lock);
4145 }
4146 mutex_unlock(&lock);
4147
4148 cma_deref_dev(cma_dev);
4149 wait_for_completion(&cma_dev->comp);
4150 }
4151
4152 static void cma_remove_one(struct ib_device *device, void *client_data)
4153 {
4154 struct cma_device *cma_dev = client_data;
4155
4156 if (!cma_dev)
4157 return;
4158
4159 mutex_lock(&lock);
4160 list_del(&cma_dev->list);
4161 mutex_unlock(&lock);
4162
4163 cma_process_remove(cma_dev);
4164 kfree(cma_dev->default_gid_type);
4165 kfree(cma_dev);
4166 }
4167
4168 static int cma_get_id_stats(struct sk_buff *skb, struct netlink_callback *cb)
4169 {
4170 struct nlmsghdr *nlh;
4171 struct rdma_cm_id_stats *id_stats;
4172 struct rdma_id_private *id_priv;
4173 struct rdma_cm_id *id = NULL;
4174 struct cma_device *cma_dev;
4175 int i_dev = 0, i_id = 0;
4176
4177 /*
4178 * We export all of the IDs as a sequence of messages. Each
4179 * ID gets its own netlink message.
4180 */
4181 mutex_lock(&lock);
4182
4183 list_for_each_entry(cma_dev, &dev_list, list) {
4184 if (i_dev < cb->args[0]) {
4185 i_dev++;
4186 continue;
4187 }
4188
4189 i_id = 0;
4190 list_for_each_entry(id_priv, &cma_dev->id_list, list) {
4191 if (i_id < cb->args[1]) {
4192 i_id++;
4193 continue;
4194 }
4195
4196 id_stats = ibnl_put_msg(skb, &nlh, cb->nlh->nlmsg_seq,
4197 sizeof *id_stats, RDMA_NL_RDMA_CM,
4198 RDMA_NL_RDMA_CM_ID_STATS,
4199 NLM_F_MULTI);
4200 if (!id_stats)
4201 goto out;
4202
4203 memset(id_stats, 0, sizeof *id_stats);
4204 id = &id_priv->id;
4205 id_stats->node_type = id->route.addr.dev_addr.dev_type;
4206 id_stats->port_num = id->port_num;
4207 id_stats->bound_dev_if =
4208 id->route.addr.dev_addr.bound_dev_if;
4209
4210 if (ibnl_put_attr(skb, nlh,
4211 rdma_addr_size(cma_src_addr(id_priv)),
4212 cma_src_addr(id_priv),
4213 RDMA_NL_RDMA_CM_ATTR_SRC_ADDR))
4214 goto out;
4215 if (ibnl_put_attr(skb, nlh,
4216 rdma_addr_size(cma_src_addr(id_priv)),
4217 cma_dst_addr(id_priv),
4218 RDMA_NL_RDMA_CM_ATTR_DST_ADDR))
4219 goto out;
4220
4221 id_stats->pid = id_priv->owner;
4222 id_stats->port_space = id->ps;
4223 id_stats->cm_state = id_priv->state;
4224 id_stats->qp_num = id_priv->qp_num;
4225 id_stats->qp_type = id->qp_type;
4226
4227 i_id++;
4228 }
4229
4230 cb->args[1] = 0;
4231 i_dev++;
4232 }
4233
4234 out:
4235 mutex_unlock(&lock);
4236 cb->args[0] = i_dev;
4237 cb->args[1] = i_id;
4238
4239 return skb->len;
4240 }
4241
4242 static const struct ibnl_client_cbs cma_cb_table[] = {
4243 [RDMA_NL_RDMA_CM_ID_STATS] = { .dump = cma_get_id_stats,
4244 .module = THIS_MODULE },
4245 };
4246
4247 static int cma_init_net(struct net *net)
4248 {
4249 struct cma_pernet *pernet = cma_pernet(net);
4250
4251 idr_init(&pernet->tcp_ps);
4252 idr_init(&pernet->udp_ps);
4253 idr_init(&pernet->ipoib_ps);
4254 idr_init(&pernet->ib_ps);
4255
4256 return 0;
4257 }
4258
4259 static void cma_exit_net(struct net *net)
4260 {
4261 struct cma_pernet *pernet = cma_pernet(net);
4262
4263 idr_destroy(&pernet->tcp_ps);
4264 idr_destroy(&pernet->udp_ps);
4265 idr_destroy(&pernet->ipoib_ps);
4266 idr_destroy(&pernet->ib_ps);
4267 }
4268
4269 static struct pernet_operations cma_pernet_operations = {
4270 .init = cma_init_net,
4271 .exit = cma_exit_net,
4272 .id = &cma_pernet_id,
4273 .size = sizeof(struct cma_pernet),
4274 };
4275
4276 static int __init cma_init(void)
4277 {
4278 int ret;
4279
4280 cma_wq = create_singlethread_workqueue("rdma_cm");
4281 if (!cma_wq)
4282 return -ENOMEM;
4283
4284 ret = register_pernet_subsys(&cma_pernet_operations);
4285 if (ret)
4286 goto err_wq;
4287
4288 ib_sa_register_client(&sa_client);
4289 rdma_addr_register_client(&addr_client);
4290 register_netdevice_notifier(&cma_nb);
4291
4292 ret = ib_register_client(&cma_client);
4293 if (ret)
4294 goto err;
4295
4296 if (ibnl_add_client(RDMA_NL_RDMA_CM, ARRAY_SIZE(cma_cb_table),
4297 cma_cb_table))
4298 pr_warn("RDMA CMA: failed to add netlink callback\n");
4299 cma_configfs_init();
4300
4301 return 0;
4302
4303 err:
4304 unregister_netdevice_notifier(&cma_nb);
4305 rdma_addr_unregister_client(&addr_client);
4306 ib_sa_unregister_client(&sa_client);
4307 err_wq:
4308 destroy_workqueue(cma_wq);
4309 return ret;
4310 }
4311
4312 static void __exit cma_cleanup(void)
4313 {
4314 cma_configfs_exit();
4315 ibnl_remove_client(RDMA_NL_RDMA_CM);
4316 ib_unregister_client(&cma_client);
4317 unregister_netdevice_notifier(&cma_nb);
4318 rdma_addr_unregister_client(&addr_client);
4319 ib_sa_unregister_client(&sa_client);
4320 unregister_pernet_subsys(&cma_pernet_operations);
4321 destroy_workqueue(cma_wq);
4322 }
4323
4324 module_init(cma_init);
4325 module_exit(cma_cleanup);
Linux kernel - Deliverables
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