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Merge tag 'kvm-4.16-1' of git://git.kernel.org/pub/scm/virt/kvm/kvm
[mirror_ubuntu-hirsute-kernel.git] / drivers / infiniband / core / cma.c
1 /*
2 * Copyright (c) 2005 Voltaire Inc. All rights reserved.
3 * Copyright (c) 2002-2005, Network Appliance, Inc. All rights reserved.
4 * Copyright (c) 1999-2005, Mellanox Technologies, Inc. All rights reserved.
5 * Copyright (c) 2005-2006 Intel Corporation. All rights reserved.
6 *
7 * This software is available to you under a choice of one of two
8 * licenses. You may choose to be licensed under the terms of the GNU
9 * General Public License (GPL) Version 2, available from the file
10 * COPYING in the main directory of this source tree, or the
11 * OpenIB.org BSD license below:
12 *
13 * Redistribution and use in source and binary forms, with or
14 * without modification, are permitted provided that the following
15 * conditions are met:
16 *
17 * - Redistributions of source code must retain the above
18 * copyright notice, this list of conditions and the following
19 * disclaimer.
20 *
21 * - Redistributions in binary form must reproduce the above
22 * copyright notice, this list of conditions and the following
23 * disclaimer in the documentation and/or other materials
24 * provided with the distribution.
25 *
26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
33 * SOFTWARE.
34 */
35
36 #include <linux/completion.h>
37 #include <linux/in.h>
38 #include <linux/in6.h>
39 #include <linux/mutex.h>
40 #include <linux/random.h>
41 #include <linux/igmp.h>
42 #include <linux/idr.h>
43 #include <linux/inetdevice.h>
44 #include <linux/slab.h>
45 #include <linux/module.h>
46 #include <net/route.h>
47
48 #include <net/net_namespace.h>
49 #include <net/netns/generic.h>
50 #include <net/tcp.h>
51 #include <net/ipv6.h>
52 #include <net/ip_fib.h>
53 #include <net/ip6_route.h>
54
55 #include <rdma/rdma_cm.h>
56 #include <rdma/rdma_cm_ib.h>
57 #include <rdma/rdma_netlink.h>
58 #include <rdma/ib.h>
59 #include <rdma/ib_cache.h>
60 #include <rdma/ib_cm.h>
61 #include <rdma/ib_sa.h>
62 #include <rdma/iw_cm.h>
63
64 #include "core_priv.h"
65
66 MODULE_AUTHOR("Sean Hefty");
67 MODULE_DESCRIPTION("Generic RDMA CM Agent");
68 MODULE_LICENSE("Dual BSD/GPL");
69
70 #define CMA_CM_RESPONSE_TIMEOUT 20
71 #define CMA_QUERY_CLASSPORT_INFO_TIMEOUT 3000
72 #define CMA_MAX_CM_RETRIES 15
73 #define CMA_CM_MRA_SETTING (IB_CM_MRA_FLAG_DELAY | 24)
74 #define CMA_IBOE_PACKET_LIFETIME 18
75 #define CMA_PREFERRED_ROCE_GID_TYPE IB_GID_TYPE_ROCE_UDP_ENCAP
76
77 static const char * const cma_events[] = {
78 [RDMA_CM_EVENT_ADDR_RESOLVED] = "address resolved",
79 [RDMA_CM_EVENT_ADDR_ERROR] = "address error",
80 [RDMA_CM_EVENT_ROUTE_RESOLVED] = "route resolved ",
81 [RDMA_CM_EVENT_ROUTE_ERROR] = "route error",
82 [RDMA_CM_EVENT_CONNECT_REQUEST] = "connect request",
83 [RDMA_CM_EVENT_CONNECT_RESPONSE] = "connect response",
84 [RDMA_CM_EVENT_CONNECT_ERROR] = "connect error",
85 [RDMA_CM_EVENT_UNREACHABLE] = "unreachable",
86 [RDMA_CM_EVENT_REJECTED] = "rejected",
87 [RDMA_CM_EVENT_ESTABLISHED] = "established",
88 [RDMA_CM_EVENT_DISCONNECTED] = "disconnected",
89 [RDMA_CM_EVENT_DEVICE_REMOVAL] = "device removal",
90 [RDMA_CM_EVENT_MULTICAST_JOIN] = "multicast join",
91 [RDMA_CM_EVENT_MULTICAST_ERROR] = "multicast error",
92 [RDMA_CM_EVENT_ADDR_CHANGE] = "address change",
93 [RDMA_CM_EVENT_TIMEWAIT_EXIT] = "timewait exit",
94 };
95
96 const char *__attribute_const__ rdma_event_msg(enum rdma_cm_event_type event)
97 {
98 size_t index = event;
99
100 return (index < ARRAY_SIZE(cma_events) && cma_events[index]) ?
101 cma_events[index] : "unrecognized event";
102 }
103 EXPORT_SYMBOL(rdma_event_msg);
104
105 const char *__attribute_const__ rdma_reject_msg(struct rdma_cm_id *id,
106 int reason)
107 {
108 if (rdma_ib_or_roce(id->device, id->port_num))
109 return ibcm_reject_msg(reason);
110
111 if (rdma_protocol_iwarp(id->device, id->port_num))
112 return iwcm_reject_msg(reason);
113
114 WARN_ON_ONCE(1);
115 return "unrecognized transport";
116 }
117 EXPORT_SYMBOL(rdma_reject_msg);
118
119 bool rdma_is_consumer_reject(struct rdma_cm_id *id, int reason)
120 {
121 if (rdma_ib_or_roce(id->device, id->port_num))
122 return reason == IB_CM_REJ_CONSUMER_DEFINED;
123
124 if (rdma_protocol_iwarp(id->device, id->port_num))
125 return reason == -ECONNREFUSED;
126
127 WARN_ON_ONCE(1);
128 return false;
129 }
130 EXPORT_SYMBOL(rdma_is_consumer_reject);
131
132 const void *rdma_consumer_reject_data(struct rdma_cm_id *id,
133 struct rdma_cm_event *ev, u8 *data_len)
134 {
135 const void *p;
136
137 if (rdma_is_consumer_reject(id, ev->status)) {
138 *data_len = ev->param.conn.private_data_len;
139 p = ev->param.conn.private_data;
140 } else {
141 *data_len = 0;
142 p = NULL;
143 }
144 return p;
145 }
146 EXPORT_SYMBOL(rdma_consumer_reject_data);
147
148 static void cma_add_one(struct ib_device *device);
149 static void cma_remove_one(struct ib_device *device, void *client_data);
150
151 static struct ib_client cma_client = {
152 .name = "cma",
153 .add = cma_add_one,
154 .remove = cma_remove_one
155 };
156
157 static struct ib_sa_client sa_client;
158 static struct rdma_addr_client addr_client;
159 static LIST_HEAD(dev_list);
160 static LIST_HEAD(listen_any_list);
161 static DEFINE_MUTEX(lock);
162 static struct workqueue_struct *cma_wq;
163 static unsigned int cma_pernet_id;
164
165 struct cma_pernet {
166 struct idr tcp_ps;
167 struct idr udp_ps;
168 struct idr ipoib_ps;
169 struct idr ib_ps;
170 };
171
172 static struct cma_pernet *cma_pernet(struct net *net)
173 {
174 return net_generic(net, cma_pernet_id);
175 }
176
177 static struct idr *cma_pernet_idr(struct net *net, enum rdma_port_space ps)
178 {
179 struct cma_pernet *pernet = cma_pernet(net);
180
181 switch (ps) {
182 case RDMA_PS_TCP:
183 return &pernet->tcp_ps;
184 case RDMA_PS_UDP:
185 return &pernet->udp_ps;
186 case RDMA_PS_IPOIB:
187 return &pernet->ipoib_ps;
188 case RDMA_PS_IB:
189 return &pernet->ib_ps;
190 default:
191 return NULL;
192 }
193 }
194
195 struct cma_device {
196 struct list_head list;
197 struct ib_device *device;
198 struct completion comp;
199 atomic_t refcount;
200 struct list_head id_list;
201 enum ib_gid_type *default_gid_type;
202 u8 *default_roce_tos;
203 };
204
205 struct rdma_bind_list {
206 enum rdma_port_space ps;
207 struct hlist_head owners;
208 unsigned short port;
209 };
210
211 struct class_port_info_context {
212 struct ib_class_port_info *class_port_info;
213 struct ib_device *device;
214 struct completion done;
215 struct ib_sa_query *sa_query;
216 u8 port_num;
217 };
218
219 static int cma_ps_alloc(struct net *net, enum rdma_port_space ps,
220 struct rdma_bind_list *bind_list, int snum)
221 {
222 struct idr *idr = cma_pernet_idr(net, ps);
223
224 return idr_alloc(idr, bind_list, snum, snum + 1, GFP_KERNEL);
225 }
226
227 static struct rdma_bind_list *cma_ps_find(struct net *net,
228 enum rdma_port_space ps, int snum)
229 {
230 struct idr *idr = cma_pernet_idr(net, ps);
231
232 return idr_find(idr, snum);
233 }
234
235 static void cma_ps_remove(struct net *net, enum rdma_port_space ps, int snum)
236 {
237 struct idr *idr = cma_pernet_idr(net, ps);
238
239 idr_remove(idr, snum);
240 }
241
242 enum {
243 CMA_OPTION_AFONLY,
244 };
245
246 void cma_ref_dev(struct cma_device *cma_dev)
247 {
248 atomic_inc(&cma_dev->refcount);
249 }
250
251 struct cma_device *cma_enum_devices_by_ibdev(cma_device_filter filter,
252 void *cookie)
253 {
254 struct cma_device *cma_dev;
255 struct cma_device *found_cma_dev = NULL;
256
257 mutex_lock(&lock);
258
259 list_for_each_entry(cma_dev, &dev_list, list)
260 if (filter(cma_dev->device, cookie)) {
261 found_cma_dev = cma_dev;
262 break;
263 }
264
265 if (found_cma_dev)
266 cma_ref_dev(found_cma_dev);
267 mutex_unlock(&lock);
268 return found_cma_dev;
269 }
270
271 int cma_get_default_gid_type(struct cma_device *cma_dev,
272 unsigned int port)
273 {
274 if (!rdma_is_port_valid(cma_dev->device, port))
275 return -EINVAL;
276
277 return cma_dev->default_gid_type[port - rdma_start_port(cma_dev->device)];
278 }
279
280 int cma_set_default_gid_type(struct cma_device *cma_dev,
281 unsigned int port,
282 enum ib_gid_type default_gid_type)
283 {
284 unsigned long supported_gids;
285
286 if (!rdma_is_port_valid(cma_dev->device, port))
287 return -EINVAL;
288
289 supported_gids = roce_gid_type_mask_support(cma_dev->device, port);
290
291 if (!(supported_gids & 1 << default_gid_type))
292 return -EINVAL;
293
294 cma_dev->default_gid_type[port - rdma_start_port(cma_dev->device)] =
295 default_gid_type;
296
297 return 0;
298 }
299
300 int cma_get_default_roce_tos(struct cma_device *cma_dev, unsigned int port)
301 {
302 if (!rdma_is_port_valid(cma_dev->device, port))
303 return -EINVAL;
304
305 return cma_dev->default_roce_tos[port - rdma_start_port(cma_dev->device)];
306 }
307
308 int cma_set_default_roce_tos(struct cma_device *cma_dev, unsigned int port,
309 u8 default_roce_tos)
310 {
311 if (!rdma_is_port_valid(cma_dev->device, port))
312 return -EINVAL;
313
314 cma_dev->default_roce_tos[port - rdma_start_port(cma_dev->device)] =
315 default_roce_tos;
316
317 return 0;
318 }
319 struct ib_device *cma_get_ib_dev(struct cma_device *cma_dev)
320 {
321 return cma_dev->device;
322 }
323
324 /*
325 * Device removal can occur at anytime, so we need extra handling to
326 * serialize notifying the user of device removal with other callbacks.
327 * We do this by disabling removal notification while a callback is in process,
328 * and reporting it after the callback completes.
329 */
330 struct rdma_id_private {
331 struct rdma_cm_id id;
332
333 struct rdma_bind_list *bind_list;
334 struct hlist_node node;
335 struct list_head list; /* listen_any_list or cma_device.list */
336 struct list_head listen_list; /* per device listens */
337 struct cma_device *cma_dev;
338 struct list_head mc_list;
339
340 int internal_id;
341 enum rdma_cm_state state;
342 spinlock_t lock;
343 struct mutex qp_mutex;
344
345 struct completion comp;
346 atomic_t refcount;
347 struct mutex handler_mutex;
348
349 int backlog;
350 int timeout_ms;
351 struct ib_sa_query *query;
352 int query_id;
353 union {
354 struct ib_cm_id *ib;
355 struct iw_cm_id *iw;
356 } cm_id;
357
358 u32 seq_num;
359 u32 qkey;
360 u32 qp_num;
361 pid_t owner;
362 u32 options;
363 u8 srq;
364 u8 tos;
365 bool tos_set;
366 u8 reuseaddr;
367 u8 afonly;
368 enum ib_gid_type gid_type;
369 };
370
371 struct cma_multicast {
372 struct rdma_id_private *id_priv;
373 union {
374 struct ib_sa_multicast *ib;
375 } multicast;
376 struct list_head list;
377 void *context;
378 struct sockaddr_storage addr;
379 struct kref mcref;
380 bool igmp_joined;
381 u8 join_state;
382 };
383
384 struct cma_work {
385 struct work_struct work;
386 struct rdma_id_private *id;
387 enum rdma_cm_state old_state;
388 enum rdma_cm_state new_state;
389 struct rdma_cm_event event;
390 };
391
392 struct cma_ndev_work {
393 struct work_struct work;
394 struct rdma_id_private *id;
395 struct rdma_cm_event event;
396 };
397
398 struct iboe_mcast_work {
399 struct work_struct work;
400 struct rdma_id_private *id;
401 struct cma_multicast *mc;
402 };
403
404 union cma_ip_addr {
405 struct in6_addr ip6;
406 struct {
407 __be32 pad[3];
408 __be32 addr;
409 } ip4;
410 };
411
412 struct cma_hdr {
413 u8 cma_version;
414 u8 ip_version; /* IP version: 7:4 */
415 __be16 port;
416 union cma_ip_addr src_addr;
417 union cma_ip_addr dst_addr;
418 };
419
420 #define CMA_VERSION 0x00
421
422 struct cma_req_info {
423 struct ib_device *device;
424 int port;
425 union ib_gid local_gid;
426 __be64 service_id;
427 u16 pkey;
428 bool has_gid:1;
429 };
430
431 static int cma_comp(struct rdma_id_private *id_priv, enum rdma_cm_state comp)
432 {
433 unsigned long flags;
434 int ret;
435
436 spin_lock_irqsave(&id_priv->lock, flags);
437 ret = (id_priv->state == comp);
438 spin_unlock_irqrestore(&id_priv->lock, flags);
439 return ret;
440 }
441
442 static int cma_comp_exch(struct rdma_id_private *id_priv,
443 enum rdma_cm_state comp, enum rdma_cm_state exch)
444 {
445 unsigned long flags;
446 int ret;
447
448 spin_lock_irqsave(&id_priv->lock, flags);
449 if ((ret = (id_priv->state == comp)))
450 id_priv->state = exch;
451 spin_unlock_irqrestore(&id_priv->lock, flags);
452 return ret;
453 }
454
455 static enum rdma_cm_state cma_exch(struct rdma_id_private *id_priv,
456 enum rdma_cm_state exch)
457 {
458 unsigned long flags;
459 enum rdma_cm_state old;
460
461 spin_lock_irqsave(&id_priv->lock, flags);
462 old = id_priv->state;
463 id_priv->state = exch;
464 spin_unlock_irqrestore(&id_priv->lock, flags);
465 return old;
466 }
467
468 static inline u8 cma_get_ip_ver(const struct cma_hdr *hdr)
469 {
470 return hdr->ip_version >> 4;
471 }
472
473 static inline void cma_set_ip_ver(struct cma_hdr *hdr, u8 ip_ver)
474 {
475 hdr->ip_version = (ip_ver << 4) | (hdr->ip_version & 0xF);
476 }
477
478 static int cma_igmp_send(struct net_device *ndev, union ib_gid *mgid, bool join)
479 {
480 struct in_device *in_dev = NULL;
481
482 if (ndev) {
483 rtnl_lock();
484 in_dev = __in_dev_get_rtnl(ndev);
485 if (in_dev) {
486 if (join)
487 ip_mc_inc_group(in_dev,
488 *(__be32 *)(mgid->raw + 12));
489 else
490 ip_mc_dec_group(in_dev,
491 *(__be32 *)(mgid->raw + 12));
492 }
493 rtnl_unlock();
494 }
495 return (in_dev) ? 0 : -ENODEV;
496 }
497
498 static void _cma_attach_to_dev(struct rdma_id_private *id_priv,
499 struct cma_device *cma_dev)
500 {
501 cma_ref_dev(cma_dev);
502 id_priv->cma_dev = cma_dev;
503 id_priv->gid_type = 0;
504 id_priv->id.device = cma_dev->device;
505 id_priv->id.route.addr.dev_addr.transport =
506 rdma_node_get_transport(cma_dev->device->node_type);
507 list_add_tail(&id_priv->list, &cma_dev->id_list);
508 }
509
510 static void cma_attach_to_dev(struct rdma_id_private *id_priv,
511 struct cma_device *cma_dev)
512 {
513 _cma_attach_to_dev(id_priv, cma_dev);
514 id_priv->gid_type =
515 cma_dev->default_gid_type[id_priv->id.port_num -
516 rdma_start_port(cma_dev->device)];
517 }
518
519 void cma_deref_dev(struct cma_device *cma_dev)
520 {
521 if (atomic_dec_and_test(&cma_dev->refcount))
522 complete(&cma_dev->comp);
523 }
524
525 static inline void release_mc(struct kref *kref)
526 {
527 struct cma_multicast *mc = container_of(kref, struct cma_multicast, mcref);
528
529 kfree(mc->multicast.ib);
530 kfree(mc);
531 }
532
533 static void cma_release_dev(struct rdma_id_private *id_priv)
534 {
535 mutex_lock(&lock);
536 list_del(&id_priv->list);
537 cma_deref_dev(id_priv->cma_dev);
538 id_priv->cma_dev = NULL;
539 mutex_unlock(&lock);
540 }
541
542 static inline struct sockaddr *cma_src_addr(struct rdma_id_private *id_priv)
543 {
544 return (struct sockaddr *) &id_priv->id.route.addr.src_addr;
545 }
546
547 static inline struct sockaddr *cma_dst_addr(struct rdma_id_private *id_priv)
548 {
549 return (struct sockaddr *) &id_priv->id.route.addr.dst_addr;
550 }
551
552 static inline unsigned short cma_family(struct rdma_id_private *id_priv)
553 {
554 return id_priv->id.route.addr.src_addr.ss_family;
555 }
556
557 static int cma_set_qkey(struct rdma_id_private *id_priv, u32 qkey)
558 {
559 struct ib_sa_mcmember_rec rec;
560 int ret = 0;
561
562 if (id_priv->qkey) {
563 if (qkey && id_priv->qkey != qkey)
564 return -EINVAL;
565 return 0;
566 }
567
568 if (qkey) {
569 id_priv->qkey = qkey;
570 return 0;
571 }
572
573 switch (id_priv->id.ps) {
574 case RDMA_PS_UDP:
575 case RDMA_PS_IB:
576 id_priv->qkey = RDMA_UDP_QKEY;
577 break;
578 case RDMA_PS_IPOIB:
579 ib_addr_get_mgid(&id_priv->id.route.addr.dev_addr, &rec.mgid);
580 ret = ib_sa_get_mcmember_rec(id_priv->id.device,
581 id_priv->id.port_num, &rec.mgid,
582 &rec);
583 if (!ret)
584 id_priv->qkey = be32_to_cpu(rec.qkey);
585 break;
586 default:
587 break;
588 }
589 return ret;
590 }
591
592 static void cma_translate_ib(struct sockaddr_ib *sib, struct rdma_dev_addr *dev_addr)
593 {
594 dev_addr->dev_type = ARPHRD_INFINIBAND;
595 rdma_addr_set_sgid(dev_addr, (union ib_gid *) &sib->sib_addr);
596 ib_addr_set_pkey(dev_addr, ntohs(sib->sib_pkey));
597 }
598
599 static int cma_translate_addr(struct sockaddr *addr, struct rdma_dev_addr *dev_addr)
600 {
601 int ret;
602
603 if (addr->sa_family != AF_IB) {
604 ret = rdma_translate_ip(addr, dev_addr);
605 } else {
606 cma_translate_ib((struct sockaddr_ib *) addr, dev_addr);
607 ret = 0;
608 }
609
610 return ret;
611 }
612
613 static inline int cma_validate_port(struct ib_device *device, u8 port,
614 enum ib_gid_type gid_type,
615 union ib_gid *gid,
616 struct rdma_id_private *id_priv)
617 {
618 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
619 int bound_if_index = dev_addr->bound_dev_if;
620 int dev_type = dev_addr->dev_type;
621 struct net_device *ndev = NULL;
622 int ret = -ENODEV;
623
624 if ((dev_type == ARPHRD_INFINIBAND) && !rdma_protocol_ib(device, port))
625 return ret;
626
627 if ((dev_type != ARPHRD_INFINIBAND) && rdma_protocol_ib(device, port))
628 return ret;
629
630 if (dev_type == ARPHRD_ETHER && rdma_protocol_roce(device, port)) {
631 ndev = dev_get_by_index(dev_addr->net, bound_if_index);
632 if (!ndev)
633 return ret;
634 } else {
635 gid_type = IB_GID_TYPE_IB;
636 }
637
638 ret = ib_find_cached_gid_by_port(device, gid, gid_type, port,
639 ndev, NULL);
640
641 if (ndev)
642 dev_put(ndev);
643
644 return ret;
645 }
646
647 static int cma_acquire_dev(struct rdma_id_private *id_priv,
648 struct rdma_id_private *listen_id_priv)
649 {
650 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
651 struct cma_device *cma_dev;
652 union ib_gid gid, iboe_gid, *gidp;
653 int ret = -ENODEV;
654 u8 port;
655
656 if (dev_addr->dev_type != ARPHRD_INFINIBAND &&
657 id_priv->id.ps == RDMA_PS_IPOIB)
658 return -EINVAL;
659
660 mutex_lock(&lock);
661 rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
662 &iboe_gid);
663
664 memcpy(&gid, dev_addr->src_dev_addr +
665 rdma_addr_gid_offset(dev_addr), sizeof gid);
666
667 if (listen_id_priv) {
668 cma_dev = listen_id_priv->cma_dev;
669 port = listen_id_priv->id.port_num;
670 gidp = rdma_protocol_roce(cma_dev->device, port) ?
671 &iboe_gid : &gid;
672
673 ret = cma_validate_port(cma_dev->device, port,
674 rdma_protocol_ib(cma_dev->device, port) ?
675 IB_GID_TYPE_IB :
676 listen_id_priv->gid_type, gidp,
677 id_priv);
678 if (!ret) {
679 id_priv->id.port_num = port;
680 goto out;
681 }
682 }
683
684 list_for_each_entry(cma_dev, &dev_list, list) {
685 for (port = 1; port <= cma_dev->device->phys_port_cnt; ++port) {
686 if (listen_id_priv &&
687 listen_id_priv->cma_dev == cma_dev &&
688 listen_id_priv->id.port_num == port)
689 continue;
690
691 gidp = rdma_protocol_roce(cma_dev->device, port) ?
692 &iboe_gid : &gid;
693
694 ret = cma_validate_port(cma_dev->device, port,
695 rdma_protocol_ib(cma_dev->device, port) ?
696 IB_GID_TYPE_IB :
697 cma_dev->default_gid_type[port - 1],
698 gidp, id_priv);
699 if (!ret) {
700 id_priv->id.port_num = port;
701 goto out;
702 }
703 }
704 }
705
706 out:
707 if (!ret)
708 cma_attach_to_dev(id_priv, cma_dev);
709
710 mutex_unlock(&lock);
711 return ret;
712 }
713
714 /*
715 * Select the source IB device and address to reach the destination IB address.
716 */
717 static int cma_resolve_ib_dev(struct rdma_id_private *id_priv)
718 {
719 struct cma_device *cma_dev, *cur_dev;
720 struct sockaddr_ib *addr;
721 union ib_gid gid, sgid, *dgid;
722 u16 pkey, index;
723 u8 p;
724 enum ib_port_state port_state;
725 int i;
726
727 cma_dev = NULL;
728 addr = (struct sockaddr_ib *) cma_dst_addr(id_priv);
729 dgid = (union ib_gid *) &addr->sib_addr;
730 pkey = ntohs(addr->sib_pkey);
731
732 list_for_each_entry(cur_dev, &dev_list, list) {
733 for (p = 1; p <= cur_dev->device->phys_port_cnt; ++p) {
734 if (!rdma_cap_af_ib(cur_dev->device, p))
735 continue;
736
737 if (ib_find_cached_pkey(cur_dev->device, p, pkey, &index))
738 continue;
739
740 if (ib_get_cached_port_state(cur_dev->device, p, &port_state))
741 continue;
742 for (i = 0; !ib_get_cached_gid(cur_dev->device, p, i,
743 &gid, NULL);
744 i++) {
745 if (!memcmp(&gid, dgid, sizeof(gid))) {
746 cma_dev = cur_dev;
747 sgid = gid;
748 id_priv->id.port_num = p;
749 goto found;
750 }
751
752 if (!cma_dev && (gid.global.subnet_prefix ==
753 dgid->global.subnet_prefix) &&
754 port_state == IB_PORT_ACTIVE) {
755 cma_dev = cur_dev;
756 sgid = gid;
757 id_priv->id.port_num = p;
758 }
759 }
760 }
761 }
762
763 if (!cma_dev)
764 return -ENODEV;
765
766 found:
767 cma_attach_to_dev(id_priv, cma_dev);
768 addr = (struct sockaddr_ib *) cma_src_addr(id_priv);
769 memcpy(&addr->sib_addr, &sgid, sizeof sgid);
770 cma_translate_ib(addr, &id_priv->id.route.addr.dev_addr);
771 return 0;
772 }
773
774 static void cma_deref_id(struct rdma_id_private *id_priv)
775 {
776 if (atomic_dec_and_test(&id_priv->refcount))
777 complete(&id_priv->comp);
778 }
779
780 struct rdma_cm_id *rdma_create_id(struct net *net,
781 rdma_cm_event_handler event_handler,
782 void *context, enum rdma_port_space ps,
783 enum ib_qp_type qp_type)
784 {
785 struct rdma_id_private *id_priv;
786
787 id_priv = kzalloc(sizeof *id_priv, GFP_KERNEL);
788 if (!id_priv)
789 return ERR_PTR(-ENOMEM);
790
791 id_priv->owner = task_pid_nr(current);
792 id_priv->state = RDMA_CM_IDLE;
793 id_priv->id.context = context;
794 id_priv->id.event_handler = event_handler;
795 id_priv->id.ps = ps;
796 id_priv->id.qp_type = qp_type;
797 id_priv->tos_set = false;
798 spin_lock_init(&id_priv->lock);
799 mutex_init(&id_priv->qp_mutex);
800 init_completion(&id_priv->comp);
801 atomic_set(&id_priv->refcount, 1);
802 mutex_init(&id_priv->handler_mutex);
803 INIT_LIST_HEAD(&id_priv->listen_list);
804 INIT_LIST_HEAD(&id_priv->mc_list);
805 get_random_bytes(&id_priv->seq_num, sizeof id_priv->seq_num);
806 id_priv->id.route.addr.dev_addr.net = get_net(net);
807 id_priv->seq_num &= 0x00ffffff;
808
809 return &id_priv->id;
810 }
811 EXPORT_SYMBOL(rdma_create_id);
812
813 static int cma_init_ud_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
814 {
815 struct ib_qp_attr qp_attr;
816 int qp_attr_mask, ret;
817
818 qp_attr.qp_state = IB_QPS_INIT;
819 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
820 if (ret)
821 return ret;
822
823 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
824 if (ret)
825 return ret;
826
827 qp_attr.qp_state = IB_QPS_RTR;
828 ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE);
829 if (ret)
830 return ret;
831
832 qp_attr.qp_state = IB_QPS_RTS;
833 qp_attr.sq_psn = 0;
834 ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE | IB_QP_SQ_PSN);
835
836 return ret;
837 }
838
839 static int cma_init_conn_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
840 {
841 struct ib_qp_attr qp_attr;
842 int qp_attr_mask, ret;
843
844 qp_attr.qp_state = IB_QPS_INIT;
845 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
846 if (ret)
847 return ret;
848
849 return ib_modify_qp(qp, &qp_attr, qp_attr_mask);
850 }
851
852 int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd,
853 struct ib_qp_init_attr *qp_init_attr)
854 {
855 struct rdma_id_private *id_priv;
856 struct ib_qp *qp;
857 int ret;
858
859 id_priv = container_of(id, struct rdma_id_private, id);
860 if (id->device != pd->device)
861 return -EINVAL;
862
863 qp_init_attr->port_num = id->port_num;
864 qp = ib_create_qp(pd, qp_init_attr);
865 if (IS_ERR(qp))
866 return PTR_ERR(qp);
867
868 if (id->qp_type == IB_QPT_UD)
869 ret = cma_init_ud_qp(id_priv, qp);
870 else
871 ret = cma_init_conn_qp(id_priv, qp);
872 if (ret)
873 goto err;
874
875 id->qp = qp;
876 id_priv->qp_num = qp->qp_num;
877 id_priv->srq = (qp->srq != NULL);
878 return 0;
879 err:
880 ib_destroy_qp(qp);
881 return ret;
882 }
883 EXPORT_SYMBOL(rdma_create_qp);
884
885 void rdma_destroy_qp(struct rdma_cm_id *id)
886 {
887 struct rdma_id_private *id_priv;
888
889 id_priv = container_of(id, struct rdma_id_private, id);
890 mutex_lock(&id_priv->qp_mutex);
891 ib_destroy_qp(id_priv->id.qp);
892 id_priv->id.qp = NULL;
893 mutex_unlock(&id_priv->qp_mutex);
894 }
895 EXPORT_SYMBOL(rdma_destroy_qp);
896
897 static int cma_modify_qp_rtr(struct rdma_id_private *id_priv,
898 struct rdma_conn_param *conn_param)
899 {
900 struct ib_qp_attr qp_attr;
901 int qp_attr_mask, ret;
902 union ib_gid sgid;
903
904 mutex_lock(&id_priv->qp_mutex);
905 if (!id_priv->id.qp) {
906 ret = 0;
907 goto out;
908 }
909
910 /* Need to update QP attributes from default values. */
911 qp_attr.qp_state = IB_QPS_INIT;
912 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
913 if (ret)
914 goto out;
915
916 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
917 if (ret)
918 goto out;
919
920 qp_attr.qp_state = IB_QPS_RTR;
921 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
922 if (ret)
923 goto out;
924
925 ret = ib_query_gid(id_priv->id.device, id_priv->id.port_num,
926 rdma_ah_read_grh(&qp_attr.ah_attr)->sgid_index,
927 &sgid, NULL);
928 if (ret)
929 goto out;
930
931 BUG_ON(id_priv->cma_dev->device != id_priv->id.device);
932
933 if (conn_param)
934 qp_attr.max_dest_rd_atomic = conn_param->responder_resources;
935 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
936 out:
937 mutex_unlock(&id_priv->qp_mutex);
938 return ret;
939 }
940
941 static int cma_modify_qp_rts(struct rdma_id_private *id_priv,
942 struct rdma_conn_param *conn_param)
943 {
944 struct ib_qp_attr qp_attr;
945 int qp_attr_mask, ret;
946
947 mutex_lock(&id_priv->qp_mutex);
948 if (!id_priv->id.qp) {
949 ret = 0;
950 goto out;
951 }
952
953 qp_attr.qp_state = IB_QPS_RTS;
954 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
955 if (ret)
956 goto out;
957
958 if (conn_param)
959 qp_attr.max_rd_atomic = conn_param->initiator_depth;
960 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
961 out:
962 mutex_unlock(&id_priv->qp_mutex);
963 return ret;
964 }
965
966 static int cma_modify_qp_err(struct rdma_id_private *id_priv)
967 {
968 struct ib_qp_attr qp_attr;
969 int ret;
970
971 mutex_lock(&id_priv->qp_mutex);
972 if (!id_priv->id.qp) {
973 ret = 0;
974 goto out;
975 }
976
977 qp_attr.qp_state = IB_QPS_ERR;
978 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, IB_QP_STATE);
979 out:
980 mutex_unlock(&id_priv->qp_mutex);
981 return ret;
982 }
983
984 static int cma_ib_init_qp_attr(struct rdma_id_private *id_priv,
985 struct ib_qp_attr *qp_attr, int *qp_attr_mask)
986 {
987 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
988 int ret;
989 u16 pkey;
990
991 if (rdma_cap_eth_ah(id_priv->id.device, id_priv->id.port_num))
992 pkey = 0xffff;
993 else
994 pkey = ib_addr_get_pkey(dev_addr);
995
996 ret = ib_find_cached_pkey(id_priv->id.device, id_priv->id.port_num,
997 pkey, &qp_attr->pkey_index);
998 if (ret)
999 return ret;
1000
1001 qp_attr->port_num = id_priv->id.port_num;
1002 *qp_attr_mask = IB_QP_STATE | IB_QP_PKEY_INDEX | IB_QP_PORT;
1003
1004 if (id_priv->id.qp_type == IB_QPT_UD) {
1005 ret = cma_set_qkey(id_priv, 0);
1006 if (ret)
1007 return ret;
1008
1009 qp_attr->qkey = id_priv->qkey;
1010 *qp_attr_mask |= IB_QP_QKEY;
1011 } else {
1012 qp_attr->qp_access_flags = 0;
1013 *qp_attr_mask |= IB_QP_ACCESS_FLAGS;
1014 }
1015 return 0;
1016 }
1017
1018 int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
1019 int *qp_attr_mask)
1020 {
1021 struct rdma_id_private *id_priv;
1022 int ret = 0;
1023
1024 id_priv = container_of(id, struct rdma_id_private, id);
1025 if (rdma_cap_ib_cm(id->device, id->port_num)) {
1026 if (!id_priv->cm_id.ib || (id_priv->id.qp_type == IB_QPT_UD))
1027 ret = cma_ib_init_qp_attr(id_priv, qp_attr, qp_attr_mask);
1028 else
1029 ret = ib_cm_init_qp_attr(id_priv->cm_id.ib, qp_attr,
1030 qp_attr_mask);
1031
1032 if (qp_attr->qp_state == IB_QPS_RTR)
1033 qp_attr->rq_psn = id_priv->seq_num;
1034 } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
1035 if (!id_priv->cm_id.iw) {
1036 qp_attr->qp_access_flags = 0;
1037 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS;
1038 } else
1039 ret = iw_cm_init_qp_attr(id_priv->cm_id.iw, qp_attr,
1040 qp_attr_mask);
1041 qp_attr->port_num = id_priv->id.port_num;
1042 *qp_attr_mask |= IB_QP_PORT;
1043 } else
1044 ret = -ENOSYS;
1045
1046 return ret;
1047 }
1048 EXPORT_SYMBOL(rdma_init_qp_attr);
1049
1050 static inline int cma_zero_addr(struct sockaddr *addr)
1051 {
1052 switch (addr->sa_family) {
1053 case AF_INET:
1054 return ipv4_is_zeronet(((struct sockaddr_in *)addr)->sin_addr.s_addr);
1055 case AF_INET6:
1056 return ipv6_addr_any(&((struct sockaddr_in6 *) addr)->sin6_addr);
1057 case AF_IB:
1058 return ib_addr_any(&((struct sockaddr_ib *) addr)->sib_addr);
1059 default:
1060 return 0;
1061 }
1062 }
1063
1064 static inline int cma_loopback_addr(struct sockaddr *addr)
1065 {
1066 switch (addr->sa_family) {
1067 case AF_INET:
1068 return ipv4_is_loopback(((struct sockaddr_in *) addr)->sin_addr.s_addr);
1069 case AF_INET6:
1070 return ipv6_addr_loopback(&((struct sockaddr_in6 *) addr)->sin6_addr);
1071 case AF_IB:
1072 return ib_addr_loopback(&((struct sockaddr_ib *) addr)->sib_addr);
1073 default:
1074 return 0;
1075 }
1076 }
1077
1078 static inline int cma_any_addr(struct sockaddr *addr)
1079 {
1080 return cma_zero_addr(addr) || cma_loopback_addr(addr);
1081 }
1082
1083 static int cma_addr_cmp(struct sockaddr *src, struct sockaddr *dst)
1084 {
1085 if (src->sa_family != dst->sa_family)
1086 return -1;
1087
1088 switch (src->sa_family) {
1089 case AF_INET:
1090 return ((struct sockaddr_in *) src)->sin_addr.s_addr !=
1091 ((struct sockaddr_in *) dst)->sin_addr.s_addr;
1092 case AF_INET6:
1093 return ipv6_addr_cmp(&((struct sockaddr_in6 *) src)->sin6_addr,
1094 &((struct sockaddr_in6 *) dst)->sin6_addr);
1095 default:
1096 return ib_addr_cmp(&((struct sockaddr_ib *) src)->sib_addr,
1097 &((struct sockaddr_ib *) dst)->sib_addr);
1098 }
1099 }
1100
1101 static __be16 cma_port(struct sockaddr *addr)
1102 {
1103 struct sockaddr_ib *sib;
1104
1105 switch (addr->sa_family) {
1106 case AF_INET:
1107 return ((struct sockaddr_in *) addr)->sin_port;
1108 case AF_INET6:
1109 return ((struct sockaddr_in6 *) addr)->sin6_port;
1110 case AF_IB:
1111 sib = (struct sockaddr_ib *) addr;
1112 return htons((u16) (be64_to_cpu(sib->sib_sid) &
1113 be64_to_cpu(sib->sib_sid_mask)));
1114 default:
1115 return 0;
1116 }
1117 }
1118
1119 static inline int cma_any_port(struct sockaddr *addr)
1120 {
1121 return !cma_port(addr);
1122 }
1123
1124 static void cma_save_ib_info(struct sockaddr *src_addr,
1125 struct sockaddr *dst_addr,
1126 struct rdma_cm_id *listen_id,
1127 struct sa_path_rec *path)
1128 {
1129 struct sockaddr_ib *listen_ib, *ib;
1130
1131 listen_ib = (struct sockaddr_ib *) &listen_id->route.addr.src_addr;
1132 if (src_addr) {
1133 ib = (struct sockaddr_ib *)src_addr;
1134 ib->sib_family = AF_IB;
1135 if (path) {
1136 ib->sib_pkey = path->pkey;
1137 ib->sib_flowinfo = path->flow_label;
1138 memcpy(&ib->sib_addr, &path->sgid, 16);
1139 ib->sib_sid = path->service_id;
1140 ib->sib_scope_id = 0;
1141 } else {
1142 ib->sib_pkey = listen_ib->sib_pkey;
1143 ib->sib_flowinfo = listen_ib->sib_flowinfo;
1144 ib->sib_addr = listen_ib->sib_addr;
1145 ib->sib_sid = listen_ib->sib_sid;
1146 ib->sib_scope_id = listen_ib->sib_scope_id;
1147 }
1148 ib->sib_sid_mask = cpu_to_be64(0xffffffffffffffffULL);
1149 }
1150 if (dst_addr) {
1151 ib = (struct sockaddr_ib *)dst_addr;
1152 ib->sib_family = AF_IB;
1153 if (path) {
1154 ib->sib_pkey = path->pkey;
1155 ib->sib_flowinfo = path->flow_label;
1156 memcpy(&ib->sib_addr, &path->dgid, 16);
1157 }
1158 }
1159 }
1160
1161 static void cma_save_ip4_info(struct sockaddr_in *src_addr,
1162 struct sockaddr_in *dst_addr,
1163 struct cma_hdr *hdr,
1164 __be16 local_port)
1165 {
1166 if (src_addr) {
1167 *src_addr = (struct sockaddr_in) {
1168 .sin_family = AF_INET,
1169 .sin_addr.s_addr = hdr->dst_addr.ip4.addr,
1170 .sin_port = local_port,
1171 };
1172 }
1173
1174 if (dst_addr) {
1175 *dst_addr = (struct sockaddr_in) {
1176 .sin_family = AF_INET,
1177 .sin_addr.s_addr = hdr->src_addr.ip4.addr,
1178 .sin_port = hdr->port,
1179 };
1180 }
1181 }
1182
1183 static void cma_save_ip6_info(struct sockaddr_in6 *src_addr,
1184 struct sockaddr_in6 *dst_addr,
1185 struct cma_hdr *hdr,
1186 __be16 local_port)
1187 {
1188 if (src_addr) {
1189 *src_addr = (struct sockaddr_in6) {
1190 .sin6_family = AF_INET6,
1191 .sin6_addr = hdr->dst_addr.ip6,
1192 .sin6_port = local_port,
1193 };
1194 }
1195
1196 if (dst_addr) {
1197 *dst_addr = (struct sockaddr_in6) {
1198 .sin6_family = AF_INET6,
1199 .sin6_addr = hdr->src_addr.ip6,
1200 .sin6_port = hdr->port,
1201 };
1202 }
1203 }
1204
1205 static u16 cma_port_from_service_id(__be64 service_id)
1206 {
1207 return (u16)be64_to_cpu(service_id);
1208 }
1209
1210 static int cma_save_ip_info(struct sockaddr *src_addr,
1211 struct sockaddr *dst_addr,
1212 struct ib_cm_event *ib_event,
1213 __be64 service_id)
1214 {
1215 struct cma_hdr *hdr;
1216 __be16 port;
1217
1218 hdr = ib_event->private_data;
1219 if (hdr->cma_version != CMA_VERSION)
1220 return -EINVAL;
1221
1222 port = htons(cma_port_from_service_id(service_id));
1223
1224 switch (cma_get_ip_ver(hdr)) {
1225 case 4:
1226 cma_save_ip4_info((struct sockaddr_in *)src_addr,
1227 (struct sockaddr_in *)dst_addr, hdr, port);
1228 break;
1229 case 6:
1230 cma_save_ip6_info((struct sockaddr_in6 *)src_addr,
1231 (struct sockaddr_in6 *)dst_addr, hdr, port);
1232 break;
1233 default:
1234 return -EAFNOSUPPORT;
1235 }
1236
1237 return 0;
1238 }
1239
1240 static int cma_save_net_info(struct sockaddr *src_addr,
1241 struct sockaddr *dst_addr,
1242 struct rdma_cm_id *listen_id,
1243 struct ib_cm_event *ib_event,
1244 sa_family_t sa_family, __be64 service_id)
1245 {
1246 if (sa_family == AF_IB) {
1247 if (ib_event->event == IB_CM_REQ_RECEIVED)
1248 cma_save_ib_info(src_addr, dst_addr, listen_id,
1249 ib_event->param.req_rcvd.primary_path);
1250 else if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED)
1251 cma_save_ib_info(src_addr, dst_addr, listen_id, NULL);
1252 return 0;
1253 }
1254
1255 return cma_save_ip_info(src_addr, dst_addr, ib_event, service_id);
1256 }
1257
1258 static int cma_save_req_info(const struct ib_cm_event *ib_event,
1259 struct cma_req_info *req)
1260 {
1261 const struct ib_cm_req_event_param *req_param =
1262 &ib_event->param.req_rcvd;
1263 const struct ib_cm_sidr_req_event_param *sidr_param =
1264 &ib_event->param.sidr_req_rcvd;
1265
1266 switch (ib_event->event) {
1267 case IB_CM_REQ_RECEIVED:
1268 req->device = req_param->listen_id->device;
1269 req->port = req_param->port;
1270 memcpy(&req->local_gid, &req_param->primary_path->sgid,
1271 sizeof(req->local_gid));
1272 req->has_gid = true;
1273 req->service_id = req_param->primary_path->service_id;
1274 req->pkey = be16_to_cpu(req_param->primary_path->pkey);
1275 if (req->pkey != req_param->bth_pkey)
1276 pr_warn_ratelimited("RDMA CMA: got different BTH P_Key (0x%x) and primary path P_Key (0x%x)\n"
1277 "RDMA CMA: in the future this may cause the request to be dropped\n",
1278 req_param->bth_pkey, req->pkey);
1279 break;
1280 case IB_CM_SIDR_REQ_RECEIVED:
1281 req->device = sidr_param->listen_id->device;
1282 req->port = sidr_param->port;
1283 req->has_gid = false;
1284 req->service_id = sidr_param->service_id;
1285 req->pkey = sidr_param->pkey;
1286 if (req->pkey != sidr_param->bth_pkey)
1287 pr_warn_ratelimited("RDMA CMA: got different BTH P_Key (0x%x) and SIDR request payload P_Key (0x%x)\n"
1288 "RDMA CMA: in the future this may cause the request to be dropped\n",
1289 sidr_param->bth_pkey, req->pkey);
1290 break;
1291 default:
1292 return -EINVAL;
1293 }
1294
1295 return 0;
1296 }
1297
1298 static bool validate_ipv4_net_dev(struct net_device *net_dev,
1299 const struct sockaddr_in *dst_addr,
1300 const struct sockaddr_in *src_addr)
1301 {
1302 __be32 daddr = dst_addr->sin_addr.s_addr,
1303 saddr = src_addr->sin_addr.s_addr;
1304 struct fib_result res;
1305 struct flowi4 fl4;
1306 int err;
1307 bool ret;
1308
1309 if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) ||
1310 ipv4_is_lbcast(daddr) || ipv4_is_zeronet(saddr) ||
1311 ipv4_is_zeronet(daddr) || ipv4_is_loopback(daddr) ||
1312 ipv4_is_loopback(saddr))
1313 return false;
1314
1315 memset(&fl4, 0, sizeof(fl4));
1316 fl4.flowi4_iif = net_dev->ifindex;
1317 fl4.daddr = daddr;
1318 fl4.saddr = saddr;
1319
1320 rcu_read_lock();
1321 err = fib_lookup(dev_net(net_dev), &fl4, &res, 0);
1322 ret = err == 0 && FIB_RES_DEV(res) == net_dev;
1323 rcu_read_unlock();
1324
1325 return ret;
1326 }
1327
1328 static bool validate_ipv6_net_dev(struct net_device *net_dev,
1329 const struct sockaddr_in6 *dst_addr,
1330 const struct sockaddr_in6 *src_addr)
1331 {
1332 #if IS_ENABLED(CONFIG_IPV6)
1333 const int strict = ipv6_addr_type(&dst_addr->sin6_addr) &
1334 IPV6_ADDR_LINKLOCAL;
1335 struct rt6_info *rt = rt6_lookup(dev_net(net_dev), &dst_addr->sin6_addr,
1336 &src_addr->sin6_addr, net_dev->ifindex,
1337 strict);
1338 bool ret;
1339
1340 if (!rt)
1341 return false;
1342
1343 ret = rt->rt6i_idev->dev == net_dev;
1344 ip6_rt_put(rt);
1345
1346 return ret;
1347 #else
1348 return false;
1349 #endif
1350 }
1351
1352 static bool validate_net_dev(struct net_device *net_dev,
1353 const struct sockaddr *daddr,
1354 const struct sockaddr *saddr)
1355 {
1356 const struct sockaddr_in *daddr4 = (const struct sockaddr_in *)daddr;
1357 const struct sockaddr_in *saddr4 = (const struct sockaddr_in *)saddr;
1358 const struct sockaddr_in6 *daddr6 = (const struct sockaddr_in6 *)daddr;
1359 const struct sockaddr_in6 *saddr6 = (const struct sockaddr_in6 *)saddr;
1360
1361 switch (daddr->sa_family) {
1362 case AF_INET:
1363 return saddr->sa_family == AF_INET &&
1364 validate_ipv4_net_dev(net_dev, daddr4, saddr4);
1365
1366 case AF_INET6:
1367 return saddr->sa_family == AF_INET6 &&
1368 validate_ipv6_net_dev(net_dev, daddr6, saddr6);
1369
1370 default:
1371 return false;
1372 }
1373 }
1374
1375 static struct net_device *cma_get_net_dev(struct ib_cm_event *ib_event,
1376 const struct cma_req_info *req)
1377 {
1378 struct sockaddr_storage listen_addr_storage, src_addr_storage;
1379 struct sockaddr *listen_addr = (struct sockaddr *)&listen_addr_storage,
1380 *src_addr = (struct sockaddr *)&src_addr_storage;
1381 struct net_device *net_dev;
1382 const union ib_gid *gid = req->has_gid ? &req->local_gid : NULL;
1383 int err;
1384
1385 err = cma_save_ip_info(listen_addr, src_addr, ib_event,
1386 req->service_id);
1387 if (err)
1388 return ERR_PTR(err);
1389
1390 net_dev = ib_get_net_dev_by_params(req->device, req->port, req->pkey,
1391 gid, listen_addr);
1392 if (!net_dev)
1393 return ERR_PTR(-ENODEV);
1394
1395 if (!validate_net_dev(net_dev, listen_addr, src_addr)) {
1396 dev_put(net_dev);
1397 return ERR_PTR(-EHOSTUNREACH);
1398 }
1399
1400 return net_dev;
1401 }
1402
1403 static enum rdma_port_space rdma_ps_from_service_id(__be64 service_id)
1404 {
1405 return (be64_to_cpu(service_id) >> 16) & 0xffff;
1406 }
1407
1408 static bool cma_match_private_data(struct rdma_id_private *id_priv,
1409 const struct cma_hdr *hdr)
1410 {
1411 struct sockaddr *addr = cma_src_addr(id_priv);
1412 __be32 ip4_addr;
1413 struct in6_addr ip6_addr;
1414
1415 if (cma_any_addr(addr) && !id_priv->afonly)
1416 return true;
1417
1418 switch (addr->sa_family) {
1419 case AF_INET:
1420 ip4_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
1421 if (cma_get_ip_ver(hdr) != 4)
1422 return false;
1423 if (!cma_any_addr(addr) &&
1424 hdr->dst_addr.ip4.addr != ip4_addr)
1425 return false;
1426 break;
1427 case AF_INET6:
1428 ip6_addr = ((struct sockaddr_in6 *)addr)->sin6_addr;
1429 if (cma_get_ip_ver(hdr) != 6)
1430 return false;
1431 if (!cma_any_addr(addr) &&
1432 memcmp(&hdr->dst_addr.ip6, &ip6_addr, sizeof(ip6_addr)))
1433 return false;
1434 break;
1435 case AF_IB:
1436 return true;
1437 default:
1438 return false;
1439 }
1440
1441 return true;
1442 }
1443
1444 static bool cma_protocol_roce_dev_port(struct ib_device *device, int port_num)
1445 {
1446 enum rdma_link_layer ll = rdma_port_get_link_layer(device, port_num);
1447 enum rdma_transport_type transport =
1448 rdma_node_get_transport(device->node_type);
1449
1450 return ll == IB_LINK_LAYER_ETHERNET && transport == RDMA_TRANSPORT_IB;
1451 }
1452
1453 static bool cma_protocol_roce(const struct rdma_cm_id *id)
1454 {
1455 struct ib_device *device = id->device;
1456 const int port_num = id->port_num ?: rdma_start_port(device);
1457
1458 return cma_protocol_roce_dev_port(device, port_num);
1459 }
1460
1461 static bool cma_match_net_dev(const struct rdma_cm_id *id,
1462 const struct net_device *net_dev,
1463 u8 port_num)
1464 {
1465 const struct rdma_addr *addr = &id->route.addr;
1466
1467 if (!net_dev)
1468 /* This request is an AF_IB request or a RoCE request */
1469 return (!id->port_num || id->port_num == port_num) &&
1470 (addr->src_addr.ss_family == AF_IB ||
1471 cma_protocol_roce_dev_port(id->device, port_num));
1472
1473 return !addr->dev_addr.bound_dev_if ||
1474 (net_eq(dev_net(net_dev), addr->dev_addr.net) &&
1475 addr->dev_addr.bound_dev_if == net_dev->ifindex);
1476 }
1477
1478 static struct rdma_id_private *cma_find_listener(
1479 const struct rdma_bind_list *bind_list,
1480 const struct ib_cm_id *cm_id,
1481 const struct ib_cm_event *ib_event,
1482 const struct cma_req_info *req,
1483 const struct net_device *net_dev)
1484 {
1485 struct rdma_id_private *id_priv, *id_priv_dev;
1486
1487 if (!bind_list)
1488 return ERR_PTR(-EINVAL);
1489
1490 hlist_for_each_entry(id_priv, &bind_list->owners, node) {
1491 if (cma_match_private_data(id_priv, ib_event->private_data)) {
1492 if (id_priv->id.device == cm_id->device &&
1493 cma_match_net_dev(&id_priv->id, net_dev, req->port))
1494 return id_priv;
1495 list_for_each_entry(id_priv_dev,
1496 &id_priv->listen_list,
1497 listen_list) {
1498 if (id_priv_dev->id.device == cm_id->device &&
1499 cma_match_net_dev(&id_priv_dev->id, net_dev, req->port))
1500 return id_priv_dev;
1501 }
1502 }
1503 }
1504
1505 return ERR_PTR(-EINVAL);
1506 }
1507
1508 static struct rdma_id_private *cma_id_from_event(struct ib_cm_id *cm_id,
1509 struct ib_cm_event *ib_event,
1510 struct net_device **net_dev)
1511 {
1512 struct cma_req_info req;
1513 struct rdma_bind_list *bind_list;
1514 struct rdma_id_private *id_priv;
1515 int err;
1516
1517 err = cma_save_req_info(ib_event, &req);
1518 if (err)
1519 return ERR_PTR(err);
1520
1521 *net_dev = cma_get_net_dev(ib_event, &req);
1522 if (IS_ERR(*net_dev)) {
1523 if (PTR_ERR(*net_dev) == -EAFNOSUPPORT) {
1524 /* Assuming the protocol is AF_IB */
1525 *net_dev = NULL;
1526 } else if (cma_protocol_roce_dev_port(req.device, req.port)) {
1527 /* TODO find the net dev matching the request parameters
1528 * through the RoCE GID table */
1529 *net_dev = NULL;
1530 } else {
1531 return ERR_CAST(*net_dev);
1532 }
1533 }
1534
1535 bind_list = cma_ps_find(*net_dev ? dev_net(*net_dev) : &init_net,
1536 rdma_ps_from_service_id(req.service_id),
1537 cma_port_from_service_id(req.service_id));
1538 id_priv = cma_find_listener(bind_list, cm_id, ib_event, &req, *net_dev);
1539 if (IS_ERR(id_priv) && *net_dev) {
1540 dev_put(*net_dev);
1541 *net_dev = NULL;
1542 }
1543
1544 return id_priv;
1545 }
1546
1547 static inline u8 cma_user_data_offset(struct rdma_id_private *id_priv)
1548 {
1549 return cma_family(id_priv) == AF_IB ? 0 : sizeof(struct cma_hdr);
1550 }
1551
1552 static void cma_cancel_route(struct rdma_id_private *id_priv)
1553 {
1554 if (rdma_cap_ib_sa(id_priv->id.device, id_priv->id.port_num)) {
1555 if (id_priv->query)
1556 ib_sa_cancel_query(id_priv->query_id, id_priv->query);
1557 }
1558 }
1559
1560 static void cma_cancel_listens(struct rdma_id_private *id_priv)
1561 {
1562 struct rdma_id_private *dev_id_priv;
1563
1564 /*
1565 * Remove from listen_any_list to prevent added devices from spawning
1566 * additional listen requests.
1567 */
1568 mutex_lock(&lock);
1569 list_del(&id_priv->list);
1570
1571 while (!list_empty(&id_priv->listen_list)) {
1572 dev_id_priv = list_entry(id_priv->listen_list.next,
1573 struct rdma_id_private, listen_list);
1574 /* sync with device removal to avoid duplicate destruction */
1575 list_del_init(&dev_id_priv->list);
1576 list_del(&dev_id_priv->listen_list);
1577 mutex_unlock(&lock);
1578
1579 rdma_destroy_id(&dev_id_priv->id);
1580 mutex_lock(&lock);
1581 }
1582 mutex_unlock(&lock);
1583 }
1584
1585 static void cma_cancel_operation(struct rdma_id_private *id_priv,
1586 enum rdma_cm_state state)
1587 {
1588 switch (state) {
1589 case RDMA_CM_ADDR_QUERY:
1590 rdma_addr_cancel(&id_priv->id.route.addr.dev_addr);
1591 break;
1592 case RDMA_CM_ROUTE_QUERY:
1593 cma_cancel_route(id_priv);
1594 break;
1595 case RDMA_CM_LISTEN:
1596 if (cma_any_addr(cma_src_addr(id_priv)) && !id_priv->cma_dev)
1597 cma_cancel_listens(id_priv);
1598 break;
1599 default:
1600 break;
1601 }
1602 }
1603
1604 static void cma_release_port(struct rdma_id_private *id_priv)
1605 {
1606 struct rdma_bind_list *bind_list = id_priv->bind_list;
1607 struct net *net = id_priv->id.route.addr.dev_addr.net;
1608
1609 if (!bind_list)
1610 return;
1611
1612 mutex_lock(&lock);
1613 hlist_del(&id_priv->node);
1614 if (hlist_empty(&bind_list->owners)) {
1615 cma_ps_remove(net, bind_list->ps, bind_list->port);
1616 kfree(bind_list);
1617 }
1618 mutex_unlock(&lock);
1619 }
1620
1621 static void cma_leave_mc_groups(struct rdma_id_private *id_priv)
1622 {
1623 struct cma_multicast *mc;
1624
1625 while (!list_empty(&id_priv->mc_list)) {
1626 mc = container_of(id_priv->mc_list.next,
1627 struct cma_multicast, list);
1628 list_del(&mc->list);
1629 if (rdma_cap_ib_mcast(id_priv->cma_dev->device,
1630 id_priv->id.port_num)) {
1631 ib_sa_free_multicast(mc->multicast.ib);
1632 kfree(mc);
1633 } else {
1634 if (mc->igmp_joined) {
1635 struct rdma_dev_addr *dev_addr =
1636 &id_priv->id.route.addr.dev_addr;
1637 struct net_device *ndev = NULL;
1638
1639 if (dev_addr->bound_dev_if)
1640 ndev = dev_get_by_index(&init_net,
1641 dev_addr->bound_dev_if);
1642 if (ndev) {
1643 cma_igmp_send(ndev,
1644 &mc->multicast.ib->rec.mgid,
1645 false);
1646 dev_put(ndev);
1647 }
1648 }
1649 kref_put(&mc->mcref, release_mc);
1650 }
1651 }
1652 }
1653
1654 void rdma_destroy_id(struct rdma_cm_id *id)
1655 {
1656 struct rdma_id_private *id_priv;
1657 enum rdma_cm_state state;
1658
1659 id_priv = container_of(id, struct rdma_id_private, id);
1660 state = cma_exch(id_priv, RDMA_CM_DESTROYING);
1661 cma_cancel_operation(id_priv, state);
1662
1663 /*
1664 * Wait for any active callback to finish. New callbacks will find
1665 * the id_priv state set to destroying and abort.
1666 */
1667 mutex_lock(&id_priv->handler_mutex);
1668 mutex_unlock(&id_priv->handler_mutex);
1669
1670 if (id_priv->cma_dev) {
1671 if (rdma_cap_ib_cm(id_priv->id.device, 1)) {
1672 if (id_priv->cm_id.ib)
1673 ib_destroy_cm_id(id_priv->cm_id.ib);
1674 } else if (rdma_cap_iw_cm(id_priv->id.device, 1)) {
1675 if (id_priv->cm_id.iw)
1676 iw_destroy_cm_id(id_priv->cm_id.iw);
1677 }
1678 cma_leave_mc_groups(id_priv);
1679 cma_release_dev(id_priv);
1680 }
1681
1682 cma_release_port(id_priv);
1683 cma_deref_id(id_priv);
1684 wait_for_completion(&id_priv->comp);
1685
1686 if (id_priv->internal_id)
1687 cma_deref_id(id_priv->id.context);
1688
1689 kfree(id_priv->id.route.path_rec);
1690 put_net(id_priv->id.route.addr.dev_addr.net);
1691 kfree(id_priv);
1692 }
1693 EXPORT_SYMBOL(rdma_destroy_id);
1694
1695 static int cma_rep_recv(struct rdma_id_private *id_priv)
1696 {
1697 int ret;
1698
1699 ret = cma_modify_qp_rtr(id_priv, NULL);
1700 if (ret)
1701 goto reject;
1702
1703 ret = cma_modify_qp_rts(id_priv, NULL);
1704 if (ret)
1705 goto reject;
1706
1707 ret = ib_send_cm_rtu(id_priv->cm_id.ib, NULL, 0);
1708 if (ret)
1709 goto reject;
1710
1711 return 0;
1712 reject:
1713 pr_debug_ratelimited("RDMA CM: CONNECT_ERROR: failed to handle reply. status %d\n", ret);
1714 cma_modify_qp_err(id_priv);
1715 ib_send_cm_rej(id_priv->cm_id.ib, IB_CM_REJ_CONSUMER_DEFINED,
1716 NULL, 0, NULL, 0);
1717 return ret;
1718 }
1719
1720 static void cma_set_rep_event_data(struct rdma_cm_event *event,
1721 struct ib_cm_rep_event_param *rep_data,
1722 void *private_data)
1723 {
1724 event->param.conn.private_data = private_data;
1725 event->param.conn.private_data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
1726 event->param.conn.responder_resources = rep_data->responder_resources;
1727 event->param.conn.initiator_depth = rep_data->initiator_depth;
1728 event->param.conn.flow_control = rep_data->flow_control;
1729 event->param.conn.rnr_retry_count = rep_data->rnr_retry_count;
1730 event->param.conn.srq = rep_data->srq;
1731 event->param.conn.qp_num = rep_data->remote_qpn;
1732 }
1733
1734 static int cma_ib_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
1735 {
1736 struct rdma_id_private *id_priv = cm_id->context;
1737 struct rdma_cm_event event;
1738 int ret = 0;
1739
1740 mutex_lock(&id_priv->handler_mutex);
1741 if ((ib_event->event != IB_CM_TIMEWAIT_EXIT &&
1742 id_priv->state != RDMA_CM_CONNECT) ||
1743 (ib_event->event == IB_CM_TIMEWAIT_EXIT &&
1744 id_priv->state != RDMA_CM_DISCONNECT))
1745 goto out;
1746
1747 memset(&event, 0, sizeof event);
1748 switch (ib_event->event) {
1749 case IB_CM_REQ_ERROR:
1750 case IB_CM_REP_ERROR:
1751 event.event = RDMA_CM_EVENT_UNREACHABLE;
1752 event.status = -ETIMEDOUT;
1753 break;
1754 case IB_CM_REP_RECEIVED:
1755 if (cma_comp(id_priv, RDMA_CM_CONNECT) &&
1756 (id_priv->id.qp_type != IB_QPT_UD))
1757 ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0);
1758 if (id_priv->id.qp) {
1759 event.status = cma_rep_recv(id_priv);
1760 event.event = event.status ? RDMA_CM_EVENT_CONNECT_ERROR :
1761 RDMA_CM_EVENT_ESTABLISHED;
1762 } else {
1763 event.event = RDMA_CM_EVENT_CONNECT_RESPONSE;
1764 }
1765 cma_set_rep_event_data(&event, &ib_event->param.rep_rcvd,
1766 ib_event->private_data);
1767 break;
1768 case IB_CM_RTU_RECEIVED:
1769 case IB_CM_USER_ESTABLISHED:
1770 event.event = RDMA_CM_EVENT_ESTABLISHED;
1771 break;
1772 case IB_CM_DREQ_ERROR:
1773 event.status = -ETIMEDOUT; /* fall through */
1774 case IB_CM_DREQ_RECEIVED:
1775 case IB_CM_DREP_RECEIVED:
1776 if (!cma_comp_exch(id_priv, RDMA_CM_CONNECT,
1777 RDMA_CM_DISCONNECT))
1778 goto out;
1779 event.event = RDMA_CM_EVENT_DISCONNECTED;
1780 break;
1781 case IB_CM_TIMEWAIT_EXIT:
1782 event.event = RDMA_CM_EVENT_TIMEWAIT_EXIT;
1783 break;
1784 case IB_CM_MRA_RECEIVED:
1785 /* ignore event */
1786 goto out;
1787 case IB_CM_REJ_RECEIVED:
1788 pr_debug_ratelimited("RDMA CM: REJECTED: %s\n", rdma_reject_msg(&id_priv->id,
1789 ib_event->param.rej_rcvd.reason));
1790 cma_modify_qp_err(id_priv);
1791 event.status = ib_event->param.rej_rcvd.reason;
1792 event.event = RDMA_CM_EVENT_REJECTED;
1793 event.param.conn.private_data = ib_event->private_data;
1794 event.param.conn.private_data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
1795 break;
1796 default:
1797 pr_err("RDMA CMA: unexpected IB CM event: %d\n",
1798 ib_event->event);
1799 goto out;
1800 }
1801
1802 ret = id_priv->id.event_handler(&id_priv->id, &event);
1803 if (ret) {
1804 /* Destroy the CM ID by returning a non-zero value. */
1805 id_priv->cm_id.ib = NULL;
1806 cma_exch(id_priv, RDMA_CM_DESTROYING);
1807 mutex_unlock(&id_priv->handler_mutex);
1808 rdma_destroy_id(&id_priv->id);
1809 return ret;
1810 }
1811 out:
1812 mutex_unlock(&id_priv->handler_mutex);
1813 return ret;
1814 }
1815
1816 static struct rdma_id_private *cma_new_conn_id(struct rdma_cm_id *listen_id,
1817 struct ib_cm_event *ib_event,
1818 struct net_device *net_dev)
1819 {
1820 struct rdma_id_private *id_priv;
1821 struct rdma_cm_id *id;
1822 struct rdma_route *rt;
1823 const sa_family_t ss_family = listen_id->route.addr.src_addr.ss_family;
1824 struct sa_path_rec *path = ib_event->param.req_rcvd.primary_path;
1825 const __be64 service_id =
1826 ib_event->param.req_rcvd.primary_path->service_id;
1827 int ret;
1828
1829 id = rdma_create_id(listen_id->route.addr.dev_addr.net,
1830 listen_id->event_handler, listen_id->context,
1831 listen_id->ps, ib_event->param.req_rcvd.qp_type);
1832 if (IS_ERR(id))
1833 return NULL;
1834
1835 id_priv = container_of(id, struct rdma_id_private, id);
1836 if (cma_save_net_info((struct sockaddr *)&id->route.addr.src_addr,
1837 (struct sockaddr *)&id->route.addr.dst_addr,
1838 listen_id, ib_event, ss_family, service_id))
1839 goto err;
1840
1841 rt = &id->route;
1842 rt->num_paths = ib_event->param.req_rcvd.alternate_path ? 2 : 1;
1843 rt->path_rec = kmalloc(sizeof *rt->path_rec * rt->num_paths,
1844 GFP_KERNEL);
1845 if (!rt->path_rec)
1846 goto err;
1847
1848 rt->path_rec[0] = *path;
1849 if (rt->num_paths == 2)
1850 rt->path_rec[1] = *ib_event->param.req_rcvd.alternate_path;
1851
1852 if (net_dev) {
1853 rdma_copy_addr(&rt->addr.dev_addr, net_dev, NULL);
1854 } else {
1855 if (!cma_protocol_roce(listen_id) &&
1856 cma_any_addr(cma_src_addr(id_priv))) {
1857 rt->addr.dev_addr.dev_type = ARPHRD_INFINIBAND;
1858 rdma_addr_set_sgid(&rt->addr.dev_addr, &rt->path_rec[0].sgid);
1859 ib_addr_set_pkey(&rt->addr.dev_addr, be16_to_cpu(rt->path_rec[0].pkey));
1860 } else if (!cma_any_addr(cma_src_addr(id_priv))) {
1861 ret = cma_translate_addr(cma_src_addr(id_priv), &rt->addr.dev_addr);
1862 if (ret)
1863 goto err;
1864 }
1865 }
1866 rdma_addr_set_dgid(&rt->addr.dev_addr, &rt->path_rec[0].dgid);
1867
1868 id_priv->state = RDMA_CM_CONNECT;
1869 return id_priv;
1870
1871 err:
1872 rdma_destroy_id(id);
1873 return NULL;
1874 }
1875
1876 static struct rdma_id_private *cma_new_udp_id(struct rdma_cm_id *listen_id,
1877 struct ib_cm_event *ib_event,
1878 struct net_device *net_dev)
1879 {
1880 struct rdma_id_private *id_priv;
1881 struct rdma_cm_id *id;
1882 const sa_family_t ss_family = listen_id->route.addr.src_addr.ss_family;
1883 struct net *net = listen_id->route.addr.dev_addr.net;
1884 int ret;
1885
1886 id = rdma_create_id(net, listen_id->event_handler, listen_id->context,
1887 listen_id->ps, IB_QPT_UD);
1888 if (IS_ERR(id))
1889 return NULL;
1890
1891 id_priv = container_of(id, struct rdma_id_private, id);
1892 if (cma_save_net_info((struct sockaddr *)&id->route.addr.src_addr,
1893 (struct sockaddr *)&id->route.addr.dst_addr,
1894 listen_id, ib_event, ss_family,
1895 ib_event->param.sidr_req_rcvd.service_id))
1896 goto err;
1897
1898 if (net_dev) {
1899 rdma_copy_addr(&id->route.addr.dev_addr, net_dev, NULL);
1900 } else {
1901 if (!cma_any_addr(cma_src_addr(id_priv))) {
1902 ret = cma_translate_addr(cma_src_addr(id_priv),
1903 &id->route.addr.dev_addr);
1904 if (ret)
1905 goto err;
1906 }
1907 }
1908
1909 id_priv->state = RDMA_CM_CONNECT;
1910 return id_priv;
1911 err:
1912 rdma_destroy_id(id);
1913 return NULL;
1914 }
1915
1916 static void cma_set_req_event_data(struct rdma_cm_event *event,
1917 struct ib_cm_req_event_param *req_data,
1918 void *private_data, int offset)
1919 {
1920 event->param.conn.private_data = private_data + offset;
1921 event->param.conn.private_data_len = IB_CM_REQ_PRIVATE_DATA_SIZE - offset;
1922 event->param.conn.responder_resources = req_data->responder_resources;
1923 event->param.conn.initiator_depth = req_data->initiator_depth;
1924 event->param.conn.flow_control = req_data->flow_control;
1925 event->param.conn.retry_count = req_data->retry_count;
1926 event->param.conn.rnr_retry_count = req_data->rnr_retry_count;
1927 event->param.conn.srq = req_data->srq;
1928 event->param.conn.qp_num = req_data->remote_qpn;
1929 }
1930
1931 static int cma_check_req_qp_type(struct rdma_cm_id *id, struct ib_cm_event *ib_event)
1932 {
1933 return (((ib_event->event == IB_CM_REQ_RECEIVED) &&
1934 (ib_event->param.req_rcvd.qp_type == id->qp_type)) ||
1935 ((ib_event->event == IB_CM_SIDR_REQ_RECEIVED) &&
1936 (id->qp_type == IB_QPT_UD)) ||
1937 (!id->qp_type));
1938 }
1939
1940 static int cma_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
1941 {
1942 struct rdma_id_private *listen_id, *conn_id = NULL;
1943 struct rdma_cm_event event;
1944 struct net_device *net_dev;
1945 u8 offset;
1946 int ret;
1947
1948 listen_id = cma_id_from_event(cm_id, ib_event, &net_dev);
1949 if (IS_ERR(listen_id))
1950 return PTR_ERR(listen_id);
1951
1952 if (!cma_check_req_qp_type(&listen_id->id, ib_event)) {
1953 ret = -EINVAL;
1954 goto net_dev_put;
1955 }
1956
1957 mutex_lock(&listen_id->handler_mutex);
1958 if (listen_id->state != RDMA_CM_LISTEN) {
1959 ret = -ECONNABORTED;
1960 goto err1;
1961 }
1962
1963 memset(&event, 0, sizeof event);
1964 offset = cma_user_data_offset(listen_id);
1965 event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
1966 if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED) {
1967 conn_id = cma_new_udp_id(&listen_id->id, ib_event, net_dev);
1968 event.param.ud.private_data = ib_event->private_data + offset;
1969 event.param.ud.private_data_len =
1970 IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE - offset;
1971 } else {
1972 conn_id = cma_new_conn_id(&listen_id->id, ib_event, net_dev);
1973 cma_set_req_event_data(&event, &ib_event->param.req_rcvd,
1974 ib_event->private_data, offset);
1975 }
1976 if (!conn_id) {
1977 ret = -ENOMEM;
1978 goto err1;
1979 }
1980
1981 mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
1982 ret = cma_acquire_dev(conn_id, listen_id);
1983 if (ret)
1984 goto err2;
1985
1986 conn_id->cm_id.ib = cm_id;
1987 cm_id->context = conn_id;
1988 cm_id->cm_handler = cma_ib_handler;
1989
1990 /*
1991 * Protect against the user destroying conn_id from another thread
1992 * until we're done accessing it.
1993 */
1994 atomic_inc(&conn_id->refcount);
1995 ret = conn_id->id.event_handler(&conn_id->id, &event);
1996 if (ret)
1997 goto err3;
1998 /*
1999 * Acquire mutex to prevent user executing rdma_destroy_id()
2000 * while we're accessing the cm_id.
2001 */
2002 mutex_lock(&lock);
2003 if (cma_comp(conn_id, RDMA_CM_CONNECT) &&
2004 (conn_id->id.qp_type != IB_QPT_UD))
2005 ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0);
2006 mutex_unlock(&lock);
2007 mutex_unlock(&conn_id->handler_mutex);
2008 mutex_unlock(&listen_id->handler_mutex);
2009 cma_deref_id(conn_id);
2010 if (net_dev)
2011 dev_put(net_dev);
2012 return 0;
2013
2014 err3:
2015 cma_deref_id(conn_id);
2016 /* Destroy the CM ID by returning a non-zero value. */
2017 conn_id->cm_id.ib = NULL;
2018 err2:
2019 cma_exch(conn_id, RDMA_CM_DESTROYING);
2020 mutex_unlock(&conn_id->handler_mutex);
2021 err1:
2022 mutex_unlock(&listen_id->handler_mutex);
2023 if (conn_id)
2024 rdma_destroy_id(&conn_id->id);
2025
2026 net_dev_put:
2027 if (net_dev)
2028 dev_put(net_dev);
2029
2030 return ret;
2031 }
2032
2033 __be64 rdma_get_service_id(struct rdma_cm_id *id, struct sockaddr *addr)
2034 {
2035 if (addr->sa_family == AF_IB)
2036 return ((struct sockaddr_ib *) addr)->sib_sid;
2037
2038 return cpu_to_be64(((u64)id->ps << 16) + be16_to_cpu(cma_port(addr)));
2039 }
2040 EXPORT_SYMBOL(rdma_get_service_id);
2041
2042 void rdma_read_gids(struct rdma_cm_id *cm_id, union ib_gid *sgid,
2043 union ib_gid *dgid)
2044 {
2045 struct rdma_addr *addr = &cm_id->route.addr;
2046
2047 if (!cm_id->device) {
2048 if (sgid)
2049 memset(sgid, 0, sizeof(*sgid));
2050 if (dgid)
2051 memset(dgid, 0, sizeof(*dgid));
2052 return;
2053 }
2054
2055 if (rdma_protocol_roce(cm_id->device, cm_id->port_num)) {
2056 if (sgid)
2057 rdma_ip2gid((struct sockaddr *)&addr->src_addr, sgid);
2058 if (dgid)
2059 rdma_ip2gid((struct sockaddr *)&addr->dst_addr, dgid);
2060 } else {
2061 if (sgid)
2062 rdma_addr_get_sgid(&addr->dev_addr, sgid);
2063 if (dgid)
2064 rdma_addr_get_dgid(&addr->dev_addr, dgid);
2065 }
2066 }
2067 EXPORT_SYMBOL(rdma_read_gids);
2068
2069 static int cma_iw_handler(struct iw_cm_id *iw_id, struct iw_cm_event *iw_event)
2070 {
2071 struct rdma_id_private *id_priv = iw_id->context;
2072 struct rdma_cm_event event;
2073 int ret = 0;
2074 struct sockaddr *laddr = (struct sockaddr *)&iw_event->local_addr;
2075 struct sockaddr *raddr = (struct sockaddr *)&iw_event->remote_addr;
2076
2077 mutex_lock(&id_priv->handler_mutex);
2078 if (id_priv->state != RDMA_CM_CONNECT)
2079 goto out;
2080
2081 memset(&event, 0, sizeof event);
2082 switch (iw_event->event) {
2083 case IW_CM_EVENT_CLOSE:
2084 event.event = RDMA_CM_EVENT_DISCONNECTED;
2085 break;
2086 case IW_CM_EVENT_CONNECT_REPLY:
2087 memcpy(cma_src_addr(id_priv), laddr,
2088 rdma_addr_size(laddr));
2089 memcpy(cma_dst_addr(id_priv), raddr,
2090 rdma_addr_size(raddr));
2091 switch (iw_event->status) {
2092 case 0:
2093 event.event = RDMA_CM_EVENT_ESTABLISHED;
2094 event.param.conn.initiator_depth = iw_event->ird;
2095 event.param.conn.responder_resources = iw_event->ord;
2096 break;
2097 case -ECONNRESET:
2098 case -ECONNREFUSED:
2099 event.event = RDMA_CM_EVENT_REJECTED;
2100 break;
2101 case -ETIMEDOUT:
2102 event.event = RDMA_CM_EVENT_UNREACHABLE;
2103 break;
2104 default:
2105 event.event = RDMA_CM_EVENT_CONNECT_ERROR;
2106 break;
2107 }
2108 break;
2109 case IW_CM_EVENT_ESTABLISHED:
2110 event.event = RDMA_CM_EVENT_ESTABLISHED;
2111 event.param.conn.initiator_depth = iw_event->ird;
2112 event.param.conn.responder_resources = iw_event->ord;
2113 break;
2114 default:
2115 BUG_ON(1);
2116 }
2117
2118 event.status = iw_event->status;
2119 event.param.conn.private_data = iw_event->private_data;
2120 event.param.conn.private_data_len = iw_event->private_data_len;
2121 ret = id_priv->id.event_handler(&id_priv->id, &event);
2122 if (ret) {
2123 /* Destroy the CM ID by returning a non-zero value. */
2124 id_priv->cm_id.iw = NULL;
2125 cma_exch(id_priv, RDMA_CM_DESTROYING);
2126 mutex_unlock(&id_priv->handler_mutex);
2127 rdma_destroy_id(&id_priv->id);
2128 return ret;
2129 }
2130
2131 out:
2132 mutex_unlock(&id_priv->handler_mutex);
2133 return ret;
2134 }
2135
2136 static int iw_conn_req_handler(struct iw_cm_id *cm_id,
2137 struct iw_cm_event *iw_event)
2138 {
2139 struct rdma_cm_id *new_cm_id;
2140 struct rdma_id_private *listen_id, *conn_id;
2141 struct rdma_cm_event event;
2142 int ret = -ECONNABORTED;
2143 struct sockaddr *laddr = (struct sockaddr *)&iw_event->local_addr;
2144 struct sockaddr *raddr = (struct sockaddr *)&iw_event->remote_addr;
2145
2146 listen_id = cm_id->context;
2147
2148 mutex_lock(&listen_id->handler_mutex);
2149 if (listen_id->state != RDMA_CM_LISTEN)
2150 goto out;
2151
2152 /* Create a new RDMA id for the new IW CM ID */
2153 new_cm_id = rdma_create_id(listen_id->id.route.addr.dev_addr.net,
2154 listen_id->id.event_handler,
2155 listen_id->id.context,
2156 RDMA_PS_TCP, IB_QPT_RC);
2157 if (IS_ERR(new_cm_id)) {
2158 ret = -ENOMEM;
2159 goto out;
2160 }
2161 conn_id = container_of(new_cm_id, struct rdma_id_private, id);
2162 mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
2163 conn_id->state = RDMA_CM_CONNECT;
2164
2165 ret = rdma_translate_ip(laddr, &conn_id->id.route.addr.dev_addr);
2166 if (ret) {
2167 mutex_unlock(&conn_id->handler_mutex);
2168 rdma_destroy_id(new_cm_id);
2169 goto out;
2170 }
2171
2172 ret = cma_acquire_dev(conn_id, listen_id);
2173 if (ret) {
2174 mutex_unlock(&conn_id->handler_mutex);
2175 rdma_destroy_id(new_cm_id);
2176 goto out;
2177 }
2178
2179 conn_id->cm_id.iw = cm_id;
2180 cm_id->context = conn_id;
2181 cm_id->cm_handler = cma_iw_handler;
2182
2183 memcpy(cma_src_addr(conn_id), laddr, rdma_addr_size(laddr));
2184 memcpy(cma_dst_addr(conn_id), raddr, rdma_addr_size(raddr));
2185
2186 memset(&event, 0, sizeof event);
2187 event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
2188 event.param.conn.private_data = iw_event->private_data;
2189 event.param.conn.private_data_len = iw_event->private_data_len;
2190 event.param.conn.initiator_depth = iw_event->ird;
2191 event.param.conn.responder_resources = iw_event->ord;
2192
2193 /*
2194 * Protect against the user destroying conn_id from another thread
2195 * until we're done accessing it.
2196 */
2197 atomic_inc(&conn_id->refcount);
2198 ret = conn_id->id.event_handler(&conn_id->id, &event);
2199 if (ret) {
2200 /* User wants to destroy the CM ID */
2201 conn_id->cm_id.iw = NULL;
2202 cma_exch(conn_id, RDMA_CM_DESTROYING);
2203 mutex_unlock(&conn_id->handler_mutex);
2204 cma_deref_id(conn_id);
2205 rdma_destroy_id(&conn_id->id);
2206 goto out;
2207 }
2208
2209 mutex_unlock(&conn_id->handler_mutex);
2210 cma_deref_id(conn_id);
2211
2212 out:
2213 mutex_unlock(&listen_id->handler_mutex);
2214 return ret;
2215 }
2216
2217 static int cma_ib_listen(struct rdma_id_private *id_priv)
2218 {
2219 struct sockaddr *addr;
2220 struct ib_cm_id *id;
2221 __be64 svc_id;
2222
2223 addr = cma_src_addr(id_priv);
2224 svc_id = rdma_get_service_id(&id_priv->id, addr);
2225 id = ib_cm_insert_listen(id_priv->id.device, cma_req_handler, svc_id);
2226 if (IS_ERR(id))
2227 return PTR_ERR(id);
2228 id_priv->cm_id.ib = id;
2229
2230 return 0;
2231 }
2232
2233 static int cma_iw_listen(struct rdma_id_private *id_priv, int backlog)
2234 {
2235 int ret;
2236 struct iw_cm_id *id;
2237
2238 id = iw_create_cm_id(id_priv->id.device,
2239 iw_conn_req_handler,
2240 id_priv);
2241 if (IS_ERR(id))
2242 return PTR_ERR(id);
2243
2244 id->tos = id_priv->tos;
2245 id_priv->cm_id.iw = id;
2246
2247 memcpy(&id_priv->cm_id.iw->local_addr, cma_src_addr(id_priv),
2248 rdma_addr_size(cma_src_addr(id_priv)));
2249
2250 ret = iw_cm_listen(id_priv->cm_id.iw, backlog);
2251
2252 if (ret) {
2253 iw_destroy_cm_id(id_priv->cm_id.iw);
2254 id_priv->cm_id.iw = NULL;
2255 }
2256
2257 return ret;
2258 }
2259
2260 static int cma_listen_handler(struct rdma_cm_id *id,
2261 struct rdma_cm_event *event)
2262 {
2263 struct rdma_id_private *id_priv = id->context;
2264
2265 id->context = id_priv->id.context;
2266 id->event_handler = id_priv->id.event_handler;
2267 return id_priv->id.event_handler(id, event);
2268 }
2269
2270 static void cma_listen_on_dev(struct rdma_id_private *id_priv,
2271 struct cma_device *cma_dev)
2272 {
2273 struct rdma_id_private *dev_id_priv;
2274 struct rdma_cm_id *id;
2275 struct net *net = id_priv->id.route.addr.dev_addr.net;
2276 int ret;
2277
2278 if (cma_family(id_priv) == AF_IB && !rdma_cap_ib_cm(cma_dev->device, 1))
2279 return;
2280
2281 id = rdma_create_id(net, cma_listen_handler, id_priv, id_priv->id.ps,
2282 id_priv->id.qp_type);
2283 if (IS_ERR(id))
2284 return;
2285
2286 dev_id_priv = container_of(id, struct rdma_id_private, id);
2287
2288 dev_id_priv->state = RDMA_CM_ADDR_BOUND;
2289 memcpy(cma_src_addr(dev_id_priv), cma_src_addr(id_priv),
2290 rdma_addr_size(cma_src_addr(id_priv)));
2291
2292 _cma_attach_to_dev(dev_id_priv, cma_dev);
2293 list_add_tail(&dev_id_priv->listen_list, &id_priv->listen_list);
2294 atomic_inc(&id_priv->refcount);
2295 dev_id_priv->internal_id = 1;
2296 dev_id_priv->afonly = id_priv->afonly;
2297
2298 ret = rdma_listen(id, id_priv->backlog);
2299 if (ret)
2300 pr_warn("RDMA CMA: cma_listen_on_dev, error %d, listening on device %s\n",
2301 ret, cma_dev->device->name);
2302 }
2303
2304 static void cma_listen_on_all(struct rdma_id_private *id_priv)
2305 {
2306 struct cma_device *cma_dev;
2307
2308 mutex_lock(&lock);
2309 list_add_tail(&id_priv->list, &listen_any_list);
2310 list_for_each_entry(cma_dev, &dev_list, list)
2311 cma_listen_on_dev(id_priv, cma_dev);
2312 mutex_unlock(&lock);
2313 }
2314
2315 void rdma_set_service_type(struct rdma_cm_id *id, int tos)
2316 {
2317 struct rdma_id_private *id_priv;
2318
2319 id_priv = container_of(id, struct rdma_id_private, id);
2320 id_priv->tos = (u8) tos;
2321 id_priv->tos_set = true;
2322 }
2323 EXPORT_SYMBOL(rdma_set_service_type);
2324
2325 static void cma_query_handler(int status, struct sa_path_rec *path_rec,
2326 void *context)
2327 {
2328 struct cma_work *work = context;
2329 struct rdma_route *route;
2330
2331 route = &work->id->id.route;
2332
2333 if (!status) {
2334 route->num_paths = 1;
2335 *route->path_rec = *path_rec;
2336 } else {
2337 work->old_state = RDMA_CM_ROUTE_QUERY;
2338 work->new_state = RDMA_CM_ADDR_RESOLVED;
2339 work->event.event = RDMA_CM_EVENT_ROUTE_ERROR;
2340 work->event.status = status;
2341 pr_debug_ratelimited("RDMA CM: ROUTE_ERROR: failed to query path. status %d\n",
2342 status);
2343 }
2344
2345 queue_work(cma_wq, &work->work);
2346 }
2347
2348 static int cma_query_ib_route(struct rdma_id_private *id_priv, int timeout_ms,
2349 struct cma_work *work)
2350 {
2351 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
2352 struct sa_path_rec path_rec;
2353 ib_sa_comp_mask comp_mask;
2354 struct sockaddr_in6 *sin6;
2355 struct sockaddr_ib *sib;
2356
2357 memset(&path_rec, 0, sizeof path_rec);
2358
2359 if (rdma_cap_opa_ah(id_priv->id.device, id_priv->id.port_num))
2360 path_rec.rec_type = SA_PATH_REC_TYPE_OPA;
2361 else
2362 path_rec.rec_type = SA_PATH_REC_TYPE_IB;
2363 rdma_addr_get_sgid(dev_addr, &path_rec.sgid);
2364 rdma_addr_get_dgid(dev_addr, &path_rec.dgid);
2365 path_rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
2366 path_rec.numb_path = 1;
2367 path_rec.reversible = 1;
2368 path_rec.service_id = rdma_get_service_id(&id_priv->id,
2369 cma_dst_addr(id_priv));
2370
2371 comp_mask = IB_SA_PATH_REC_DGID | IB_SA_PATH_REC_SGID |
2372 IB_SA_PATH_REC_PKEY | IB_SA_PATH_REC_NUMB_PATH |
2373 IB_SA_PATH_REC_REVERSIBLE | IB_SA_PATH_REC_SERVICE_ID;
2374
2375 switch (cma_family(id_priv)) {
2376 case AF_INET:
2377 path_rec.qos_class = cpu_to_be16((u16) id_priv->tos);
2378 comp_mask |= IB_SA_PATH_REC_QOS_CLASS;
2379 break;
2380 case AF_INET6:
2381 sin6 = (struct sockaddr_in6 *) cma_src_addr(id_priv);
2382 path_rec.traffic_class = (u8) (be32_to_cpu(sin6->sin6_flowinfo) >> 20);
2383 comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
2384 break;
2385 case AF_IB:
2386 sib = (struct sockaddr_ib *) cma_src_addr(id_priv);
2387 path_rec.traffic_class = (u8) (be32_to_cpu(sib->sib_flowinfo) >> 20);
2388 comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
2389 break;
2390 }
2391
2392 id_priv->query_id = ib_sa_path_rec_get(&sa_client, id_priv->id.device,
2393 id_priv->id.port_num, &path_rec,
2394 comp_mask, timeout_ms,
2395 GFP_KERNEL, cma_query_handler,
2396 work, &id_priv->query);
2397
2398 return (id_priv->query_id < 0) ? id_priv->query_id : 0;
2399 }
2400
2401 static void cma_work_handler(struct work_struct *_work)
2402 {
2403 struct cma_work *work = container_of(_work, struct cma_work, work);
2404 struct rdma_id_private *id_priv = work->id;
2405 int destroy = 0;
2406
2407 mutex_lock(&id_priv->handler_mutex);
2408 if (!cma_comp_exch(id_priv, work->old_state, work->new_state))
2409 goto out;
2410
2411 if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
2412 cma_exch(id_priv, RDMA_CM_DESTROYING);
2413 destroy = 1;
2414 }
2415 out:
2416 mutex_unlock(&id_priv->handler_mutex);
2417 cma_deref_id(id_priv);
2418 if (destroy)
2419 rdma_destroy_id(&id_priv->id);
2420 kfree(work);
2421 }
2422
2423 static void cma_ndev_work_handler(struct work_struct *_work)
2424 {
2425 struct cma_ndev_work *work = container_of(_work, struct cma_ndev_work, work);
2426 struct rdma_id_private *id_priv = work->id;
2427 int destroy = 0;
2428
2429 mutex_lock(&id_priv->handler_mutex);
2430 if (id_priv->state == RDMA_CM_DESTROYING ||
2431 id_priv->state == RDMA_CM_DEVICE_REMOVAL)
2432 goto out;
2433
2434 if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
2435 cma_exch(id_priv, RDMA_CM_DESTROYING);
2436 destroy = 1;
2437 }
2438
2439 out:
2440 mutex_unlock(&id_priv->handler_mutex);
2441 cma_deref_id(id_priv);
2442 if (destroy)
2443 rdma_destroy_id(&id_priv->id);
2444 kfree(work);
2445 }
2446
2447 static void cma_init_resolve_route_work(struct cma_work *work,
2448 struct rdma_id_private *id_priv)
2449 {
2450 work->id = id_priv;
2451 INIT_WORK(&work->work, cma_work_handler);
2452 work->old_state = RDMA_CM_ROUTE_QUERY;
2453 work->new_state = RDMA_CM_ROUTE_RESOLVED;
2454 work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
2455 }
2456
2457 static void cma_init_resolve_addr_work(struct cma_work *work,
2458 struct rdma_id_private *id_priv)
2459 {
2460 work->id = id_priv;
2461 INIT_WORK(&work->work, cma_work_handler);
2462 work->old_state = RDMA_CM_ADDR_QUERY;
2463 work->new_state = RDMA_CM_ADDR_RESOLVED;
2464 work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
2465 }
2466
2467 static int cma_resolve_ib_route(struct rdma_id_private *id_priv, int timeout_ms)
2468 {
2469 struct rdma_route *route = &id_priv->id.route;
2470 struct cma_work *work;
2471 int ret;
2472
2473 work = kzalloc(sizeof *work, GFP_KERNEL);
2474 if (!work)
2475 return -ENOMEM;
2476
2477 cma_init_resolve_route_work(work, id_priv);
2478
2479 route->path_rec = kmalloc(sizeof *route->path_rec, GFP_KERNEL);
2480 if (!route->path_rec) {
2481 ret = -ENOMEM;
2482 goto err1;
2483 }
2484
2485 ret = cma_query_ib_route(id_priv, timeout_ms, work);
2486 if (ret)
2487 goto err2;
2488
2489 return 0;
2490 err2:
2491 kfree(route->path_rec);
2492 route->path_rec = NULL;
2493 err1:
2494 kfree(work);
2495 return ret;
2496 }
2497
2498 static enum ib_gid_type cma_route_gid_type(enum rdma_network_type network_type,
2499 unsigned long supported_gids,
2500 enum ib_gid_type default_gid)
2501 {
2502 if ((network_type == RDMA_NETWORK_IPV4 ||
2503 network_type == RDMA_NETWORK_IPV6) &&
2504 test_bit(IB_GID_TYPE_ROCE_UDP_ENCAP, &supported_gids))
2505 return IB_GID_TYPE_ROCE_UDP_ENCAP;
2506
2507 return default_gid;
2508 }
2509
2510 /*
2511 * cma_iboe_set_path_rec_l2_fields() is helper function which sets
2512 * path record type based on GID type.
2513 * It also sets up other L2 fields which includes destination mac address
2514 * netdev ifindex, of the path record.
2515 * It returns the netdev of the bound interface for this path record entry.
2516 */
2517 static struct net_device *
2518 cma_iboe_set_path_rec_l2_fields(struct rdma_id_private *id_priv)
2519 {
2520 struct rdma_route *route = &id_priv->id.route;
2521 enum ib_gid_type gid_type = IB_GID_TYPE_ROCE;
2522 struct rdma_addr *addr = &route->addr;
2523 unsigned long supported_gids;
2524 struct net_device *ndev;
2525
2526 if (!addr->dev_addr.bound_dev_if)
2527 return NULL;
2528
2529 ndev = dev_get_by_index(addr->dev_addr.net,
2530 addr->dev_addr.bound_dev_if);
2531 if (!ndev)
2532 return NULL;
2533
2534 supported_gids = roce_gid_type_mask_support(id_priv->id.device,
2535 id_priv->id.port_num);
2536 gid_type = cma_route_gid_type(addr->dev_addr.network,
2537 supported_gids,
2538 id_priv->gid_type);
2539 /* Use the hint from IP Stack to select GID Type */
2540 if (gid_type < ib_network_to_gid_type(addr->dev_addr.network))
2541 gid_type = ib_network_to_gid_type(addr->dev_addr.network);
2542 route->path_rec->rec_type = sa_conv_gid_to_pathrec_type(gid_type);
2543
2544 sa_path_set_ndev(route->path_rec, addr->dev_addr.net);
2545 sa_path_set_ifindex(route->path_rec, ndev->ifindex);
2546 sa_path_set_dmac(route->path_rec, addr->dev_addr.dst_dev_addr);
2547 return ndev;
2548 }
2549
2550 int rdma_set_ib_path(struct rdma_cm_id *id,
2551 struct sa_path_rec *path_rec)
2552 {
2553 struct rdma_id_private *id_priv;
2554 struct net_device *ndev;
2555 int ret;
2556
2557 id_priv = container_of(id, struct rdma_id_private, id);
2558 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED,
2559 RDMA_CM_ROUTE_RESOLVED))
2560 return -EINVAL;
2561
2562 id->route.path_rec = kmemdup(path_rec, sizeof(*path_rec),
2563 GFP_KERNEL);
2564 if (!id->route.path_rec) {
2565 ret = -ENOMEM;
2566 goto err;
2567 }
2568
2569 if (rdma_protocol_roce(id->device, id->port_num)) {
2570 ndev = cma_iboe_set_path_rec_l2_fields(id_priv);
2571 if (!ndev) {
2572 ret = -ENODEV;
2573 goto err_free;
2574 }
2575 dev_put(ndev);
2576 }
2577
2578 id->route.num_paths = 1;
2579 return 0;
2580
2581 err_free:
2582 kfree(id->route.path_rec);
2583 id->route.path_rec = NULL;
2584 err:
2585 cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_ADDR_RESOLVED);
2586 return ret;
2587 }
2588 EXPORT_SYMBOL(rdma_set_ib_path);
2589
2590 static int cma_resolve_iw_route(struct rdma_id_private *id_priv, int timeout_ms)
2591 {
2592 struct cma_work *work;
2593
2594 work = kzalloc(sizeof *work, GFP_KERNEL);
2595 if (!work)
2596 return -ENOMEM;
2597
2598 cma_init_resolve_route_work(work, id_priv);
2599 queue_work(cma_wq, &work->work);
2600 return 0;
2601 }
2602
2603 static int iboe_tos_to_sl(struct net_device *ndev, int tos)
2604 {
2605 int prio;
2606 struct net_device *dev;
2607
2608 prio = rt_tos2priority(tos);
2609 dev = is_vlan_dev(ndev) ? vlan_dev_real_dev(ndev) : ndev;
2610 if (dev->num_tc)
2611 return netdev_get_prio_tc_map(dev, prio);
2612
2613 #if IS_ENABLED(CONFIG_VLAN_8021Q)
2614 if (is_vlan_dev(ndev))
2615 return (vlan_dev_get_egress_qos_mask(ndev, prio) &
2616 VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
2617 #endif
2618 return 0;
2619 }
2620
2621 static int cma_resolve_iboe_route(struct rdma_id_private *id_priv)
2622 {
2623 struct rdma_route *route = &id_priv->id.route;
2624 struct rdma_addr *addr = &route->addr;
2625 struct cma_work *work;
2626 int ret;
2627 struct net_device *ndev;
2628
2629 u8 default_roce_tos = id_priv->cma_dev->default_roce_tos[id_priv->id.port_num -
2630 rdma_start_port(id_priv->cma_dev->device)];
2631 u8 tos = id_priv->tos_set ? id_priv->tos : default_roce_tos;
2632
2633
2634 work = kzalloc(sizeof *work, GFP_KERNEL);
2635 if (!work)
2636 return -ENOMEM;
2637
2638 route->path_rec = kzalloc(sizeof *route->path_rec, GFP_KERNEL);
2639 if (!route->path_rec) {
2640 ret = -ENOMEM;
2641 goto err1;
2642 }
2643
2644 route->num_paths = 1;
2645
2646 ndev = cma_iboe_set_path_rec_l2_fields(id_priv);
2647 if (!ndev) {
2648 ret = -ENODEV;
2649 goto err2;
2650 }
2651
2652 rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
2653 &route->path_rec->sgid);
2654 rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.dst_addr,
2655 &route->path_rec->dgid);
2656
2657 if (((struct sockaddr *)&id_priv->id.route.addr.dst_addr)->sa_family != AF_IB)
2658 /* TODO: get the hoplimit from the inet/inet6 device */
2659 route->path_rec->hop_limit = addr->dev_addr.hoplimit;
2660 else
2661 route->path_rec->hop_limit = 1;
2662 route->path_rec->reversible = 1;
2663 route->path_rec->pkey = cpu_to_be16(0xffff);
2664 route->path_rec->mtu_selector = IB_SA_EQ;
2665 route->path_rec->sl = iboe_tos_to_sl(ndev, tos);
2666 route->path_rec->traffic_class = tos;
2667 route->path_rec->mtu = iboe_get_mtu(ndev->mtu);
2668 route->path_rec->rate_selector = IB_SA_EQ;
2669 route->path_rec->rate = iboe_get_rate(ndev);
2670 dev_put(ndev);
2671 route->path_rec->packet_life_time_selector = IB_SA_EQ;
2672 route->path_rec->packet_life_time = CMA_IBOE_PACKET_LIFETIME;
2673 if (!route->path_rec->mtu) {
2674 ret = -EINVAL;
2675 goto err2;
2676 }
2677
2678 cma_init_resolve_route_work(work, id_priv);
2679 queue_work(cma_wq, &work->work);
2680
2681 return 0;
2682
2683 err2:
2684 kfree(route->path_rec);
2685 route->path_rec = NULL;
2686 err1:
2687 kfree(work);
2688 return ret;
2689 }
2690
2691 int rdma_resolve_route(struct rdma_cm_id *id, int timeout_ms)
2692 {
2693 struct rdma_id_private *id_priv;
2694 int ret;
2695
2696 id_priv = container_of(id, struct rdma_id_private, id);
2697 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED, RDMA_CM_ROUTE_QUERY))
2698 return -EINVAL;
2699
2700 atomic_inc(&id_priv->refcount);
2701 if (rdma_cap_ib_sa(id->device, id->port_num))
2702 ret = cma_resolve_ib_route(id_priv, timeout_ms);
2703 else if (rdma_protocol_roce(id->device, id->port_num))
2704 ret = cma_resolve_iboe_route(id_priv);
2705 else if (rdma_protocol_iwarp(id->device, id->port_num))
2706 ret = cma_resolve_iw_route(id_priv, timeout_ms);
2707 else
2708 ret = -ENOSYS;
2709
2710 if (ret)
2711 goto err;
2712
2713 return 0;
2714 err:
2715 cma_comp_exch(id_priv, RDMA_CM_ROUTE_QUERY, RDMA_CM_ADDR_RESOLVED);
2716 cma_deref_id(id_priv);
2717 return ret;
2718 }
2719 EXPORT_SYMBOL(rdma_resolve_route);
2720
2721 static void cma_set_loopback(struct sockaddr *addr)
2722 {
2723 switch (addr->sa_family) {
2724 case AF_INET:
2725 ((struct sockaddr_in *) addr)->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
2726 break;
2727 case AF_INET6:
2728 ipv6_addr_set(&((struct sockaddr_in6 *) addr)->sin6_addr,
2729 0, 0, 0, htonl(1));
2730 break;
2731 default:
2732 ib_addr_set(&((struct sockaddr_ib *) addr)->sib_addr,
2733 0, 0, 0, htonl(1));
2734 break;
2735 }
2736 }
2737
2738 static int cma_bind_loopback(struct rdma_id_private *id_priv)
2739 {
2740 struct cma_device *cma_dev, *cur_dev;
2741 union ib_gid gid;
2742 enum ib_port_state port_state;
2743 u16 pkey;
2744 int ret;
2745 u8 p;
2746
2747 cma_dev = NULL;
2748 mutex_lock(&lock);
2749 list_for_each_entry(cur_dev, &dev_list, list) {
2750 if (cma_family(id_priv) == AF_IB &&
2751 !rdma_cap_ib_cm(cur_dev->device, 1))
2752 continue;
2753
2754 if (!cma_dev)
2755 cma_dev = cur_dev;
2756
2757 for (p = 1; p <= cur_dev->device->phys_port_cnt; ++p) {
2758 if (!ib_get_cached_port_state(cur_dev->device, p, &port_state) &&
2759 port_state == IB_PORT_ACTIVE) {
2760 cma_dev = cur_dev;
2761 goto port_found;
2762 }
2763 }
2764 }
2765
2766 if (!cma_dev) {
2767 ret = -ENODEV;
2768 goto out;
2769 }
2770
2771 p = 1;
2772
2773 port_found:
2774 ret = ib_get_cached_gid(cma_dev->device, p, 0, &gid, NULL);
2775 if (ret)
2776 goto out;
2777
2778 ret = ib_get_cached_pkey(cma_dev->device, p, 0, &pkey);
2779 if (ret)
2780 goto out;
2781
2782 id_priv->id.route.addr.dev_addr.dev_type =
2783 (rdma_protocol_ib(cma_dev->device, p)) ?
2784 ARPHRD_INFINIBAND : ARPHRD_ETHER;
2785
2786 rdma_addr_set_sgid(&id_priv->id.route.addr.dev_addr, &gid);
2787 ib_addr_set_pkey(&id_priv->id.route.addr.dev_addr, pkey);
2788 id_priv->id.port_num = p;
2789 cma_attach_to_dev(id_priv, cma_dev);
2790 cma_set_loopback(cma_src_addr(id_priv));
2791 out:
2792 mutex_unlock(&lock);
2793 return ret;
2794 }
2795
2796 static void addr_handler(int status, struct sockaddr *src_addr,
2797 struct rdma_dev_addr *dev_addr, void *context)
2798 {
2799 struct rdma_id_private *id_priv = context;
2800 struct rdma_cm_event event;
2801
2802 memset(&event, 0, sizeof event);
2803 mutex_lock(&id_priv->handler_mutex);
2804 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY,
2805 RDMA_CM_ADDR_RESOLVED))
2806 goto out;
2807
2808 memcpy(cma_src_addr(id_priv), src_addr, rdma_addr_size(src_addr));
2809 if (!status && !id_priv->cma_dev) {
2810 status = cma_acquire_dev(id_priv, NULL);
2811 if (status)
2812 pr_debug_ratelimited("RDMA CM: ADDR_ERROR: failed to acquire device. status %d\n",
2813 status);
2814 } else {
2815 pr_debug_ratelimited("RDMA CM: ADDR_ERROR: failed to resolve IP. status %d\n", status);
2816 }
2817
2818 if (status) {
2819 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED,
2820 RDMA_CM_ADDR_BOUND))
2821 goto out;
2822 event.event = RDMA_CM_EVENT_ADDR_ERROR;
2823 event.status = status;
2824 } else
2825 event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
2826
2827 if (id_priv->id.event_handler(&id_priv->id, &event)) {
2828 cma_exch(id_priv, RDMA_CM_DESTROYING);
2829 mutex_unlock(&id_priv->handler_mutex);
2830 cma_deref_id(id_priv);
2831 rdma_destroy_id(&id_priv->id);
2832 return;
2833 }
2834 out:
2835 mutex_unlock(&id_priv->handler_mutex);
2836 cma_deref_id(id_priv);
2837 }
2838
2839 static int cma_resolve_loopback(struct rdma_id_private *id_priv)
2840 {
2841 struct cma_work *work;
2842 union ib_gid gid;
2843 int ret;
2844
2845 work = kzalloc(sizeof *work, GFP_KERNEL);
2846 if (!work)
2847 return -ENOMEM;
2848
2849 if (!id_priv->cma_dev) {
2850 ret = cma_bind_loopback(id_priv);
2851 if (ret)
2852 goto err;
2853 }
2854
2855 rdma_addr_get_sgid(&id_priv->id.route.addr.dev_addr, &gid);
2856 rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, &gid);
2857
2858 cma_init_resolve_addr_work(work, id_priv);
2859 queue_work(cma_wq, &work->work);
2860 return 0;
2861 err:
2862 kfree(work);
2863 return ret;
2864 }
2865
2866 static int cma_resolve_ib_addr(struct rdma_id_private *id_priv)
2867 {
2868 struct cma_work *work;
2869 int ret;
2870
2871 work = kzalloc(sizeof *work, GFP_KERNEL);
2872 if (!work)
2873 return -ENOMEM;
2874
2875 if (!id_priv->cma_dev) {
2876 ret = cma_resolve_ib_dev(id_priv);
2877 if (ret)
2878 goto err;
2879 }
2880
2881 rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, (union ib_gid *)
2882 &(((struct sockaddr_ib *) &id_priv->id.route.addr.dst_addr)->sib_addr));
2883
2884 cma_init_resolve_addr_work(work, id_priv);
2885 queue_work(cma_wq, &work->work);
2886 return 0;
2887 err:
2888 kfree(work);
2889 return ret;
2890 }
2891
2892 static int cma_bind_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
2893 struct sockaddr *dst_addr)
2894 {
2895 if (!src_addr || !src_addr->sa_family) {
2896 src_addr = (struct sockaddr *) &id->route.addr.src_addr;
2897 src_addr->sa_family = dst_addr->sa_family;
2898 if (IS_ENABLED(CONFIG_IPV6) &&
2899 dst_addr->sa_family == AF_INET6) {
2900 struct sockaddr_in6 *src_addr6 = (struct sockaddr_in6 *) src_addr;
2901 struct sockaddr_in6 *dst_addr6 = (struct sockaddr_in6 *) dst_addr;
2902 src_addr6->sin6_scope_id = dst_addr6->sin6_scope_id;
2903 if (ipv6_addr_type(&dst_addr6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
2904 id->route.addr.dev_addr.bound_dev_if = dst_addr6->sin6_scope_id;
2905 } else if (dst_addr->sa_family == AF_IB) {
2906 ((struct sockaddr_ib *) src_addr)->sib_pkey =
2907 ((struct sockaddr_ib *) dst_addr)->sib_pkey;
2908 }
2909 }
2910 return rdma_bind_addr(id, src_addr);
2911 }
2912
2913 int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
2914 struct sockaddr *dst_addr, int timeout_ms)
2915 {
2916 struct rdma_id_private *id_priv;
2917 int ret;
2918
2919 id_priv = container_of(id, struct rdma_id_private, id);
2920 memcpy(cma_dst_addr(id_priv), dst_addr, rdma_addr_size(dst_addr));
2921 if (id_priv->state == RDMA_CM_IDLE) {
2922 ret = cma_bind_addr(id, src_addr, dst_addr);
2923 if (ret) {
2924 memset(cma_dst_addr(id_priv), 0, rdma_addr_size(dst_addr));
2925 return ret;
2926 }
2927 }
2928
2929 if (cma_family(id_priv) != dst_addr->sa_family) {
2930 memset(cma_dst_addr(id_priv), 0, rdma_addr_size(dst_addr));
2931 return -EINVAL;
2932 }
2933
2934 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_ADDR_QUERY)) {
2935 memset(cma_dst_addr(id_priv), 0, rdma_addr_size(dst_addr));
2936 return -EINVAL;
2937 }
2938
2939 atomic_inc(&id_priv->refcount);
2940 if (cma_any_addr(dst_addr)) {
2941 ret = cma_resolve_loopback(id_priv);
2942 } else {
2943 if (dst_addr->sa_family == AF_IB) {
2944 ret = cma_resolve_ib_addr(id_priv);
2945 } else {
2946 ret = rdma_resolve_ip(&addr_client, cma_src_addr(id_priv),
2947 dst_addr, &id->route.addr.dev_addr,
2948 timeout_ms, addr_handler, id_priv);
2949 }
2950 }
2951 if (ret)
2952 goto err;
2953
2954 return 0;
2955 err:
2956 cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY, RDMA_CM_ADDR_BOUND);
2957 cma_deref_id(id_priv);
2958 return ret;
2959 }
2960 EXPORT_SYMBOL(rdma_resolve_addr);
2961
2962 int rdma_set_reuseaddr(struct rdma_cm_id *id, int reuse)
2963 {
2964 struct rdma_id_private *id_priv;
2965 unsigned long flags;
2966 int ret;
2967
2968 id_priv = container_of(id, struct rdma_id_private, id);
2969 spin_lock_irqsave(&id_priv->lock, flags);
2970 if (reuse || id_priv->state == RDMA_CM_IDLE) {
2971 id_priv->reuseaddr = reuse;
2972 ret = 0;
2973 } else {
2974 ret = -EINVAL;
2975 }
2976 spin_unlock_irqrestore(&id_priv->lock, flags);
2977 return ret;
2978 }
2979 EXPORT_SYMBOL(rdma_set_reuseaddr);
2980
2981 int rdma_set_afonly(struct rdma_cm_id *id, int afonly)
2982 {
2983 struct rdma_id_private *id_priv;
2984 unsigned long flags;
2985 int ret;
2986
2987 id_priv = container_of(id, struct rdma_id_private, id);
2988 spin_lock_irqsave(&id_priv->lock, flags);
2989 if (id_priv->state == RDMA_CM_IDLE || id_priv->state == RDMA_CM_ADDR_BOUND) {
2990 id_priv->options |= (1 << CMA_OPTION_AFONLY);
2991 id_priv->afonly = afonly;
2992 ret = 0;
2993 } else {
2994 ret = -EINVAL;
2995 }
2996 spin_unlock_irqrestore(&id_priv->lock, flags);
2997 return ret;
2998 }
2999 EXPORT_SYMBOL(rdma_set_afonly);
3000
3001 static void cma_bind_port(struct rdma_bind_list *bind_list,
3002 struct rdma_id_private *id_priv)
3003 {
3004 struct sockaddr *addr;
3005 struct sockaddr_ib *sib;
3006 u64 sid, mask;
3007 __be16 port;
3008
3009 addr = cma_src_addr(id_priv);
3010 port = htons(bind_list->port);
3011
3012 switch (addr->sa_family) {
3013 case AF_INET:
3014 ((struct sockaddr_in *) addr)->sin_port = port;
3015 break;
3016 case AF_INET6:
3017 ((struct sockaddr_in6 *) addr)->sin6_port = port;
3018 break;
3019 case AF_IB:
3020 sib = (struct sockaddr_ib *) addr;
3021 sid = be64_to_cpu(sib->sib_sid);
3022 mask = be64_to_cpu(sib->sib_sid_mask);
3023 sib->sib_sid = cpu_to_be64((sid & mask) | (u64) ntohs(port));
3024 sib->sib_sid_mask = cpu_to_be64(~0ULL);
3025 break;
3026 }
3027 id_priv->bind_list = bind_list;
3028 hlist_add_head(&id_priv->node, &bind_list->owners);
3029 }
3030
3031 static int cma_alloc_port(enum rdma_port_space ps,
3032 struct rdma_id_private *id_priv, unsigned short snum)
3033 {
3034 struct rdma_bind_list *bind_list;
3035 int ret;
3036
3037 bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL);
3038 if (!bind_list)
3039 return -ENOMEM;
3040
3041 ret = cma_ps_alloc(id_priv->id.route.addr.dev_addr.net, ps, bind_list,
3042 snum);
3043 if (ret < 0)
3044 goto err;
3045
3046 bind_list->ps = ps;
3047 bind_list->port = (unsigned short)ret;
3048 cma_bind_port(bind_list, id_priv);
3049 return 0;
3050 err:
3051 kfree(bind_list);
3052 return ret == -ENOSPC ? -EADDRNOTAVAIL : ret;
3053 }
3054
3055 static int cma_port_is_unique(struct rdma_bind_list *bind_list,
3056 struct rdma_id_private *id_priv)
3057 {
3058 struct rdma_id_private *cur_id;
3059 struct sockaddr *daddr = cma_dst_addr(id_priv);
3060 struct sockaddr *saddr = cma_src_addr(id_priv);
3061 __be16 dport = cma_port(daddr);
3062
3063 hlist_for_each_entry(cur_id, &bind_list->owners, node) {
3064 struct sockaddr *cur_daddr = cma_dst_addr(cur_id);
3065 struct sockaddr *cur_saddr = cma_src_addr(cur_id);
3066 __be16 cur_dport = cma_port(cur_daddr);
3067
3068 if (id_priv == cur_id)
3069 continue;
3070
3071 /* different dest port -> unique */
3072 if (!cma_any_port(cur_daddr) &&
3073 (dport != cur_dport))
3074 continue;
3075
3076 /* different src address -> unique */
3077 if (!cma_any_addr(saddr) &&
3078 !cma_any_addr(cur_saddr) &&
3079 cma_addr_cmp(saddr, cur_saddr))
3080 continue;
3081
3082 /* different dst address -> unique */
3083 if (!cma_any_addr(cur_daddr) &&
3084 cma_addr_cmp(daddr, cur_daddr))
3085 continue;
3086
3087 return -EADDRNOTAVAIL;
3088 }
3089 return 0;
3090 }
3091
3092 static int cma_alloc_any_port(enum rdma_port_space ps,
3093 struct rdma_id_private *id_priv)
3094 {
3095 static unsigned int last_used_port;
3096 int low, high, remaining;
3097 unsigned int rover;
3098 struct net *net = id_priv->id.route.addr.dev_addr.net;
3099
3100 inet_get_local_port_range(net, &low, &high);
3101 remaining = (high - low) + 1;
3102 rover = prandom_u32() % remaining + low;
3103 retry:
3104 if (last_used_port != rover) {
3105 struct rdma_bind_list *bind_list;
3106 int ret;
3107
3108 bind_list = cma_ps_find(net, ps, (unsigned short)rover);
3109
3110 if (!bind_list) {
3111 ret = cma_alloc_port(ps, id_priv, rover);
3112 } else {
3113 ret = cma_port_is_unique(bind_list, id_priv);
3114 if (!ret)
3115 cma_bind_port(bind_list, id_priv);
3116 }
3117 /*
3118 * Remember previously used port number in order to avoid
3119 * re-using same port immediately after it is closed.
3120 */
3121 if (!ret)
3122 last_used_port = rover;
3123 if (ret != -EADDRNOTAVAIL)
3124 return ret;
3125 }
3126 if (--remaining) {
3127 rover++;
3128 if ((rover < low) || (rover > high))
3129 rover = low;
3130 goto retry;
3131 }
3132 return -EADDRNOTAVAIL;
3133 }
3134
3135 /*
3136 * Check that the requested port is available. This is called when trying to
3137 * bind to a specific port, or when trying to listen on a bound port. In
3138 * the latter case, the provided id_priv may already be on the bind_list, but
3139 * we still need to check that it's okay to start listening.
3140 */
3141 static int cma_check_port(struct rdma_bind_list *bind_list,
3142 struct rdma_id_private *id_priv, uint8_t reuseaddr)
3143 {
3144 struct rdma_id_private *cur_id;
3145 struct sockaddr *addr, *cur_addr;
3146
3147 addr = cma_src_addr(id_priv);
3148 hlist_for_each_entry(cur_id, &bind_list->owners, node) {
3149 if (id_priv == cur_id)
3150 continue;
3151
3152 if ((cur_id->state != RDMA_CM_LISTEN) && reuseaddr &&
3153 cur_id->reuseaddr)
3154 continue;
3155
3156 cur_addr = cma_src_addr(cur_id);
3157 if (id_priv->afonly && cur_id->afonly &&
3158 (addr->sa_family != cur_addr->sa_family))
3159 continue;
3160
3161 if (cma_any_addr(addr) || cma_any_addr(cur_addr))
3162 return -EADDRNOTAVAIL;
3163
3164 if (!cma_addr_cmp(addr, cur_addr))
3165 return -EADDRINUSE;
3166 }
3167 return 0;
3168 }
3169
3170 static int cma_use_port(enum rdma_port_space ps,
3171 struct rdma_id_private *id_priv)
3172 {
3173 struct rdma_bind_list *bind_list;
3174 unsigned short snum;
3175 int ret;
3176
3177 snum = ntohs(cma_port(cma_src_addr(id_priv)));
3178 if (snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
3179 return -EACCES;
3180
3181 bind_list = cma_ps_find(id_priv->id.route.addr.dev_addr.net, ps, snum);
3182 if (!bind_list) {
3183 ret = cma_alloc_port(ps, id_priv, snum);
3184 } else {
3185 ret = cma_check_port(bind_list, id_priv, id_priv->reuseaddr);
3186 if (!ret)
3187 cma_bind_port(bind_list, id_priv);
3188 }
3189 return ret;
3190 }
3191
3192 static int cma_bind_listen(struct rdma_id_private *id_priv)
3193 {
3194 struct rdma_bind_list *bind_list = id_priv->bind_list;
3195 int ret = 0;
3196
3197 mutex_lock(&lock);
3198 if (bind_list->owners.first->next)
3199 ret = cma_check_port(bind_list, id_priv, 0);
3200 mutex_unlock(&lock);
3201 return ret;
3202 }
3203
3204 static enum rdma_port_space cma_select_inet_ps(
3205 struct rdma_id_private *id_priv)
3206 {
3207 switch (id_priv->id.ps) {
3208 case RDMA_PS_TCP:
3209 case RDMA_PS_UDP:
3210 case RDMA_PS_IPOIB:
3211 case RDMA_PS_IB:
3212 return id_priv->id.ps;
3213 default:
3214
3215 return 0;
3216 }
3217 }
3218
3219 static enum rdma_port_space cma_select_ib_ps(struct rdma_id_private *id_priv)
3220 {
3221 enum rdma_port_space ps = 0;
3222 struct sockaddr_ib *sib;
3223 u64 sid_ps, mask, sid;
3224
3225 sib = (struct sockaddr_ib *) cma_src_addr(id_priv);
3226 mask = be64_to_cpu(sib->sib_sid_mask) & RDMA_IB_IP_PS_MASK;
3227 sid = be64_to_cpu(sib->sib_sid) & mask;
3228
3229 if ((id_priv->id.ps == RDMA_PS_IB) && (sid == (RDMA_IB_IP_PS_IB & mask))) {
3230 sid_ps = RDMA_IB_IP_PS_IB;
3231 ps = RDMA_PS_IB;
3232 } else if (((id_priv->id.ps == RDMA_PS_IB) || (id_priv->id.ps == RDMA_PS_TCP)) &&
3233 (sid == (RDMA_IB_IP_PS_TCP & mask))) {
3234 sid_ps = RDMA_IB_IP_PS_TCP;
3235 ps = RDMA_PS_TCP;
3236 } else if (((id_priv->id.ps == RDMA_PS_IB) || (id_priv->id.ps == RDMA_PS_UDP)) &&
3237 (sid == (RDMA_IB_IP_PS_UDP & mask))) {
3238 sid_ps = RDMA_IB_IP_PS_UDP;
3239 ps = RDMA_PS_UDP;
3240 }
3241
3242 if (ps) {
3243 sib->sib_sid = cpu_to_be64(sid_ps | ntohs(cma_port((struct sockaddr *) sib)));
3244 sib->sib_sid_mask = cpu_to_be64(RDMA_IB_IP_PS_MASK |
3245 be64_to_cpu(sib->sib_sid_mask));
3246 }
3247 return ps;
3248 }
3249
3250 static int cma_get_port(struct rdma_id_private *id_priv)
3251 {
3252 enum rdma_port_space ps;
3253 int ret;
3254
3255 if (cma_family(id_priv) != AF_IB)
3256 ps = cma_select_inet_ps(id_priv);
3257 else
3258 ps = cma_select_ib_ps(id_priv);
3259 if (!ps)
3260 return -EPROTONOSUPPORT;
3261
3262 mutex_lock(&lock);
3263 if (cma_any_port(cma_src_addr(id_priv)))
3264 ret = cma_alloc_any_port(ps, id_priv);
3265 else
3266 ret = cma_use_port(ps, id_priv);
3267 mutex_unlock(&lock);
3268
3269 return ret;
3270 }
3271
3272 static int cma_check_linklocal(struct rdma_dev_addr *dev_addr,
3273 struct sockaddr *addr)
3274 {
3275 #if IS_ENABLED(CONFIG_IPV6)
3276 struct sockaddr_in6 *sin6;
3277
3278 if (addr->sa_family != AF_INET6)
3279 return 0;
3280
3281 sin6 = (struct sockaddr_in6 *) addr;
3282
3283 if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
3284 return 0;
3285
3286 if (!sin6->sin6_scope_id)
3287 return -EINVAL;
3288
3289 dev_addr->bound_dev_if = sin6->sin6_scope_id;
3290 #endif
3291 return 0;
3292 }
3293
3294 int rdma_listen(struct rdma_cm_id *id, int backlog)
3295 {
3296 struct rdma_id_private *id_priv;
3297 int ret;
3298
3299 id_priv = container_of(id, struct rdma_id_private, id);
3300 if (id_priv->state == RDMA_CM_IDLE) {
3301 id->route.addr.src_addr.ss_family = AF_INET;
3302 ret = rdma_bind_addr(id, cma_src_addr(id_priv));
3303 if (ret)
3304 return ret;
3305 }
3306
3307 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_LISTEN))
3308 return -EINVAL;
3309
3310 if (id_priv->reuseaddr) {
3311 ret = cma_bind_listen(id_priv);
3312 if (ret)
3313 goto err;
3314 }
3315
3316 id_priv->backlog = backlog;
3317 if (id->device) {
3318 if (rdma_cap_ib_cm(id->device, 1)) {
3319 ret = cma_ib_listen(id_priv);
3320 if (ret)
3321 goto err;
3322 } else if (rdma_cap_iw_cm(id->device, 1)) {
3323 ret = cma_iw_listen(id_priv, backlog);
3324 if (ret)
3325 goto err;
3326 } else {
3327 ret = -ENOSYS;
3328 goto err;
3329 }
3330 } else
3331 cma_listen_on_all(id_priv);
3332
3333 return 0;
3334 err:
3335 id_priv->backlog = 0;
3336 cma_comp_exch(id_priv, RDMA_CM_LISTEN, RDMA_CM_ADDR_BOUND);
3337 return ret;
3338 }
3339 EXPORT_SYMBOL(rdma_listen);
3340
3341 int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr)
3342 {
3343 struct rdma_id_private *id_priv;
3344 int ret;
3345 struct sockaddr *daddr;
3346
3347 if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6 &&
3348 addr->sa_family != AF_IB)
3349 return -EAFNOSUPPORT;
3350
3351 id_priv = container_of(id, struct rdma_id_private, id);
3352 if (!cma_comp_exch(id_priv, RDMA_CM_IDLE, RDMA_CM_ADDR_BOUND))
3353 return -EINVAL;
3354
3355 ret = cma_check_linklocal(&id->route.addr.dev_addr, addr);
3356 if (ret)
3357 goto err1;
3358
3359 memcpy(cma_src_addr(id_priv), addr, rdma_addr_size(addr));
3360 if (!cma_any_addr(addr)) {
3361 ret = cma_translate_addr(addr, &id->route.addr.dev_addr);
3362 if (ret)
3363 goto err1;
3364
3365 ret = cma_acquire_dev(id_priv, NULL);
3366 if (ret)
3367 goto err1;
3368 }
3369
3370 if (!(id_priv->options & (1 << CMA_OPTION_AFONLY))) {
3371 if (addr->sa_family == AF_INET)
3372 id_priv->afonly = 1;
3373 #if IS_ENABLED(CONFIG_IPV6)
3374 else if (addr->sa_family == AF_INET6) {
3375 struct net *net = id_priv->id.route.addr.dev_addr.net;
3376
3377 id_priv->afonly = net->ipv6.sysctl.bindv6only;
3378 }
3379 #endif
3380 }
3381 ret = cma_get_port(id_priv);
3382 if (ret)
3383 goto err2;
3384
3385 daddr = cma_dst_addr(id_priv);
3386 daddr->sa_family = addr->sa_family;
3387
3388 return 0;
3389 err2:
3390 if (id_priv->cma_dev)
3391 cma_release_dev(id_priv);
3392 err1:
3393 cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_IDLE);
3394 return ret;
3395 }
3396 EXPORT_SYMBOL(rdma_bind_addr);
3397
3398 static int cma_format_hdr(void *hdr, struct rdma_id_private *id_priv)
3399 {
3400 struct cma_hdr *cma_hdr;
3401
3402 cma_hdr = hdr;
3403 cma_hdr->cma_version = CMA_VERSION;
3404 if (cma_family(id_priv) == AF_INET) {
3405 struct sockaddr_in *src4, *dst4;
3406
3407 src4 = (struct sockaddr_in *) cma_src_addr(id_priv);
3408 dst4 = (struct sockaddr_in *) cma_dst_addr(id_priv);
3409
3410 cma_set_ip_ver(cma_hdr, 4);
3411 cma_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
3412 cma_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
3413 cma_hdr->port = src4->sin_port;
3414 } else if (cma_family(id_priv) == AF_INET6) {
3415 struct sockaddr_in6 *src6, *dst6;
3416
3417 src6 = (struct sockaddr_in6 *) cma_src_addr(id_priv);
3418 dst6 = (struct sockaddr_in6 *) cma_dst_addr(id_priv);
3419
3420 cma_set_ip_ver(cma_hdr, 6);
3421 cma_hdr->src_addr.ip6 = src6->sin6_addr;
3422 cma_hdr->dst_addr.ip6 = dst6->sin6_addr;
3423 cma_hdr->port = src6->sin6_port;
3424 }
3425 return 0;
3426 }
3427
3428 static int cma_sidr_rep_handler(struct ib_cm_id *cm_id,
3429 struct ib_cm_event *ib_event)
3430 {
3431 struct rdma_id_private *id_priv = cm_id->context;
3432 struct rdma_cm_event event;
3433 struct ib_cm_sidr_rep_event_param *rep = &ib_event->param.sidr_rep_rcvd;
3434 int ret = 0;
3435
3436 mutex_lock(&id_priv->handler_mutex);
3437 if (id_priv->state != RDMA_CM_CONNECT)
3438 goto out;
3439
3440 memset(&event, 0, sizeof event);
3441 switch (ib_event->event) {
3442 case IB_CM_SIDR_REQ_ERROR:
3443 event.event = RDMA_CM_EVENT_UNREACHABLE;
3444 event.status = -ETIMEDOUT;
3445 break;
3446 case IB_CM_SIDR_REP_RECEIVED:
3447 event.param.ud.private_data = ib_event->private_data;
3448 event.param.ud.private_data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
3449 if (rep->status != IB_SIDR_SUCCESS) {
3450 event.event = RDMA_CM_EVENT_UNREACHABLE;
3451 event.status = ib_event->param.sidr_rep_rcvd.status;
3452 pr_debug_ratelimited("RDMA CM: UNREACHABLE: bad SIDR reply. status %d\n",
3453 event.status);
3454 break;
3455 }
3456 ret = cma_set_qkey(id_priv, rep->qkey);
3457 if (ret) {
3458 pr_debug_ratelimited("RDMA CM: ADDR_ERROR: failed to set qkey. status %d\n", ret);
3459 event.event = RDMA_CM_EVENT_ADDR_ERROR;
3460 event.status = ret;
3461 break;
3462 }
3463 ib_init_ah_attr_from_path(id_priv->id.device,
3464 id_priv->id.port_num,
3465 id_priv->id.route.path_rec,
3466 &event.param.ud.ah_attr);
3467 event.param.ud.qp_num = rep->qpn;
3468 event.param.ud.qkey = rep->qkey;
3469 event.event = RDMA_CM_EVENT_ESTABLISHED;
3470 event.status = 0;
3471 break;
3472 default:
3473 pr_err("RDMA CMA: unexpected IB CM event: %d\n",
3474 ib_event->event);
3475 goto out;
3476 }
3477
3478 ret = id_priv->id.event_handler(&id_priv->id, &event);
3479 if (ret) {
3480 /* Destroy the CM ID by returning a non-zero value. */
3481 id_priv->cm_id.ib = NULL;
3482 cma_exch(id_priv, RDMA_CM_DESTROYING);
3483 mutex_unlock(&id_priv->handler_mutex);
3484 rdma_destroy_id(&id_priv->id);
3485 return ret;
3486 }
3487 out:
3488 mutex_unlock(&id_priv->handler_mutex);
3489 return ret;
3490 }
3491
3492 static int cma_resolve_ib_udp(struct rdma_id_private *id_priv,
3493 struct rdma_conn_param *conn_param)
3494 {
3495 struct ib_cm_sidr_req_param req;
3496 struct ib_cm_id *id;
3497 void *private_data;
3498 u8 offset;
3499 int ret;
3500
3501 memset(&req, 0, sizeof req);
3502 offset = cma_user_data_offset(id_priv);
3503 req.private_data_len = offset + conn_param->private_data_len;
3504 if (req.private_data_len < conn_param->private_data_len)
3505 return -EINVAL;
3506
3507 if (req.private_data_len) {
3508 private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
3509 if (!private_data)
3510 return -ENOMEM;
3511 } else {
3512 private_data = NULL;
3513 }
3514
3515 if (conn_param->private_data && conn_param->private_data_len)
3516 memcpy(private_data + offset, conn_param->private_data,
3517 conn_param->private_data_len);
3518
3519 if (private_data) {
3520 ret = cma_format_hdr(private_data, id_priv);
3521 if (ret)
3522 goto out;
3523 req.private_data = private_data;
3524 }
3525
3526 id = ib_create_cm_id(id_priv->id.device, cma_sidr_rep_handler,
3527 id_priv);
3528 if (IS_ERR(id)) {
3529 ret = PTR_ERR(id);
3530 goto out;
3531 }
3532 id_priv->cm_id.ib = id;
3533
3534 req.path = id_priv->id.route.path_rec;
3535 req.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
3536 req.timeout_ms = 1 << (CMA_CM_RESPONSE_TIMEOUT - 8);
3537 req.max_cm_retries = CMA_MAX_CM_RETRIES;
3538
3539 ret = ib_send_cm_sidr_req(id_priv->cm_id.ib, &req);
3540 if (ret) {
3541 ib_destroy_cm_id(id_priv->cm_id.ib);
3542 id_priv->cm_id.ib = NULL;
3543 }
3544 out:
3545 kfree(private_data);
3546 return ret;
3547 }
3548
3549 static int cma_connect_ib(struct rdma_id_private *id_priv,
3550 struct rdma_conn_param *conn_param)
3551 {
3552 struct ib_cm_req_param req;
3553 struct rdma_route *route;
3554 void *private_data;
3555 struct ib_cm_id *id;
3556 u8 offset;
3557 int ret;
3558
3559 memset(&req, 0, sizeof req);
3560 offset = cma_user_data_offset(id_priv);
3561 req.private_data_len = offset + conn_param->private_data_len;
3562 if (req.private_data_len < conn_param->private_data_len)
3563 return -EINVAL;
3564
3565 if (req.private_data_len) {
3566 private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
3567 if (!private_data)
3568 return -ENOMEM;
3569 } else {
3570 private_data = NULL;
3571 }
3572
3573 if (conn_param->private_data && conn_param->private_data_len)
3574 memcpy(private_data + offset, conn_param->private_data,
3575 conn_param->private_data_len);
3576
3577 id = ib_create_cm_id(id_priv->id.device, cma_ib_handler, id_priv);
3578 if (IS_ERR(id)) {
3579 ret = PTR_ERR(id);
3580 goto out;
3581 }
3582 id_priv->cm_id.ib = id;
3583
3584 route = &id_priv->id.route;
3585 if (private_data) {
3586 ret = cma_format_hdr(private_data, id_priv);
3587 if (ret)
3588 goto out;
3589 req.private_data = private_data;
3590 }
3591
3592 req.primary_path = &route->path_rec[0];
3593 if (route->num_paths == 2)
3594 req.alternate_path = &route->path_rec[1];
3595
3596 req.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
3597 req.qp_num = id_priv->qp_num;
3598 req.qp_type = id_priv->id.qp_type;
3599 req.starting_psn = id_priv->seq_num;
3600 req.responder_resources = conn_param->responder_resources;
3601 req.initiator_depth = conn_param->initiator_depth;
3602 req.flow_control = conn_param->flow_control;
3603 req.retry_count = min_t(u8, 7, conn_param->retry_count);
3604 req.rnr_retry_count = min_t(u8, 7, conn_param->rnr_retry_count);
3605 req.remote_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
3606 req.local_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
3607 req.max_cm_retries = CMA_MAX_CM_RETRIES;
3608 req.srq = id_priv->srq ? 1 : 0;
3609
3610 ret = ib_send_cm_req(id_priv->cm_id.ib, &req);
3611 out:
3612 if (ret && !IS_ERR(id)) {
3613 ib_destroy_cm_id(id);
3614 id_priv->cm_id.ib = NULL;
3615 }
3616
3617 kfree(private_data);
3618 return ret;
3619 }
3620
3621 static int cma_connect_iw(struct rdma_id_private *id_priv,
3622 struct rdma_conn_param *conn_param)
3623 {
3624 struct iw_cm_id *cm_id;
3625 int ret;
3626 struct iw_cm_conn_param iw_param;
3627
3628 cm_id = iw_create_cm_id(id_priv->id.device, cma_iw_handler, id_priv);
3629 if (IS_ERR(cm_id))
3630 return PTR_ERR(cm_id);
3631
3632 cm_id->tos = id_priv->tos;
3633 id_priv->cm_id.iw = cm_id;
3634
3635 memcpy(&cm_id->local_addr, cma_src_addr(id_priv),
3636 rdma_addr_size(cma_src_addr(id_priv)));
3637 memcpy(&cm_id->remote_addr, cma_dst_addr(id_priv),
3638 rdma_addr_size(cma_dst_addr(id_priv)));
3639
3640 ret = cma_modify_qp_rtr(id_priv, conn_param);
3641 if (ret)
3642 goto out;
3643
3644 if (conn_param) {
3645 iw_param.ord = conn_param->initiator_depth;
3646 iw_param.ird = conn_param->responder_resources;
3647 iw_param.private_data = conn_param->private_data;
3648 iw_param.private_data_len = conn_param->private_data_len;
3649 iw_param.qpn = id_priv->id.qp ? id_priv->qp_num : conn_param->qp_num;
3650 } else {
3651 memset(&iw_param, 0, sizeof iw_param);
3652 iw_param.qpn = id_priv->qp_num;
3653 }
3654 ret = iw_cm_connect(cm_id, &iw_param);
3655 out:
3656 if (ret) {
3657 iw_destroy_cm_id(cm_id);
3658 id_priv->cm_id.iw = NULL;
3659 }
3660 return ret;
3661 }
3662
3663 int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
3664 {
3665 struct rdma_id_private *id_priv;
3666 int ret;
3667
3668 id_priv = container_of(id, struct rdma_id_private, id);
3669 if (!cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_CONNECT))
3670 return -EINVAL;
3671
3672 if (!id->qp) {
3673 id_priv->qp_num = conn_param->qp_num;
3674 id_priv->srq = conn_param->srq;
3675 }
3676
3677 if (rdma_cap_ib_cm(id->device, id->port_num)) {
3678 if (id->qp_type == IB_QPT_UD)
3679 ret = cma_resolve_ib_udp(id_priv, conn_param);
3680 else
3681 ret = cma_connect_ib(id_priv, conn_param);
3682 } else if (rdma_cap_iw_cm(id->device, id->port_num))
3683 ret = cma_connect_iw(id_priv, conn_param);
3684 else
3685 ret = -ENOSYS;
3686 if (ret)
3687 goto err;
3688
3689 return 0;
3690 err:
3691 cma_comp_exch(id_priv, RDMA_CM_CONNECT, RDMA_CM_ROUTE_RESOLVED);
3692 return ret;
3693 }
3694 EXPORT_SYMBOL(rdma_connect);
3695
3696 static int cma_accept_ib(struct rdma_id_private *id_priv,
3697 struct rdma_conn_param *conn_param)
3698 {
3699 struct ib_cm_rep_param rep;
3700 int ret;
3701
3702 ret = cma_modify_qp_rtr(id_priv, conn_param);
3703 if (ret)
3704 goto out;
3705
3706 ret = cma_modify_qp_rts(id_priv, conn_param);
3707 if (ret)
3708 goto out;
3709
3710 memset(&rep, 0, sizeof rep);
3711 rep.qp_num = id_priv->qp_num;
3712 rep.starting_psn = id_priv->seq_num;
3713 rep.private_data = conn_param->private_data;
3714 rep.private_data_len = conn_param->private_data_len;
3715 rep.responder_resources = conn_param->responder_resources;
3716 rep.initiator_depth = conn_param->initiator_depth;
3717 rep.failover_accepted = 0;
3718 rep.flow_control = conn_param->flow_control;
3719 rep.rnr_retry_count = min_t(u8, 7, conn_param->rnr_retry_count);
3720 rep.srq = id_priv->srq ? 1 : 0;
3721
3722 ret = ib_send_cm_rep(id_priv->cm_id.ib, &rep);
3723 out:
3724 return ret;
3725 }
3726
3727 static int cma_accept_iw(struct rdma_id_private *id_priv,
3728 struct rdma_conn_param *conn_param)
3729 {
3730 struct iw_cm_conn_param iw_param;
3731 int ret;
3732
3733 if (!conn_param)
3734 return -EINVAL;
3735
3736 ret = cma_modify_qp_rtr(id_priv, conn_param);
3737 if (ret)
3738 return ret;
3739
3740 iw_param.ord = conn_param->initiator_depth;
3741 iw_param.ird = conn_param->responder_resources;
3742 iw_param.private_data = conn_param->private_data;
3743 iw_param.private_data_len = conn_param->private_data_len;
3744 if (id_priv->id.qp) {
3745 iw_param.qpn = id_priv->qp_num;
3746 } else
3747 iw_param.qpn = conn_param->qp_num;
3748
3749 return iw_cm_accept(id_priv->cm_id.iw, &iw_param);
3750 }
3751
3752 static int cma_send_sidr_rep(struct rdma_id_private *id_priv,
3753 enum ib_cm_sidr_status status, u32 qkey,
3754 const void *private_data, int private_data_len)
3755 {
3756 struct ib_cm_sidr_rep_param rep;
3757 int ret;
3758
3759 memset(&rep, 0, sizeof rep);
3760 rep.status = status;
3761 if (status == IB_SIDR_SUCCESS) {
3762 ret = cma_set_qkey(id_priv, qkey);
3763 if (ret)
3764 return ret;
3765 rep.qp_num = id_priv->qp_num;
3766 rep.qkey = id_priv->qkey;
3767 }
3768 rep.private_data = private_data;
3769 rep.private_data_len = private_data_len;
3770
3771 return ib_send_cm_sidr_rep(id_priv->cm_id.ib, &rep);
3772 }
3773
3774 int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
3775 {
3776 struct rdma_id_private *id_priv;
3777 int ret;
3778
3779 id_priv = container_of(id, struct rdma_id_private, id);
3780
3781 id_priv->owner = task_pid_nr(current);
3782
3783 if (!cma_comp(id_priv, RDMA_CM_CONNECT))
3784 return -EINVAL;
3785
3786 if (!id->qp && conn_param) {
3787 id_priv->qp_num = conn_param->qp_num;
3788 id_priv->srq = conn_param->srq;
3789 }
3790
3791 if (rdma_cap_ib_cm(id->device, id->port_num)) {
3792 if (id->qp_type == IB_QPT_UD) {
3793 if (conn_param)
3794 ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
3795 conn_param->qkey,
3796 conn_param->private_data,
3797 conn_param->private_data_len);
3798 else
3799 ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
3800 0, NULL, 0);
3801 } else {
3802 if (conn_param)
3803 ret = cma_accept_ib(id_priv, conn_param);
3804 else
3805 ret = cma_rep_recv(id_priv);
3806 }
3807 } else if (rdma_cap_iw_cm(id->device, id->port_num))
3808 ret = cma_accept_iw(id_priv, conn_param);
3809 else
3810 ret = -ENOSYS;
3811
3812 if (ret)
3813 goto reject;
3814
3815 return 0;
3816 reject:
3817 cma_modify_qp_err(id_priv);
3818 rdma_reject(id, NULL, 0);
3819 return ret;
3820 }
3821 EXPORT_SYMBOL(rdma_accept);
3822
3823 int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event)
3824 {
3825 struct rdma_id_private *id_priv;
3826 int ret;
3827
3828 id_priv = container_of(id, struct rdma_id_private, id);
3829 if (!id_priv->cm_id.ib)
3830 return -EINVAL;
3831
3832 switch (id->device->node_type) {
3833 case RDMA_NODE_IB_CA:
3834 ret = ib_cm_notify(id_priv->cm_id.ib, event);
3835 break;
3836 default:
3837 ret = 0;
3838 break;
3839 }
3840 return ret;
3841 }
3842 EXPORT_SYMBOL(rdma_notify);
3843
3844 int rdma_reject(struct rdma_cm_id *id, const void *private_data,
3845 u8 private_data_len)
3846 {
3847 struct rdma_id_private *id_priv;
3848 int ret;
3849
3850 id_priv = container_of(id, struct rdma_id_private, id);
3851 if (!id_priv->cm_id.ib)
3852 return -EINVAL;
3853
3854 if (rdma_cap_ib_cm(id->device, id->port_num)) {
3855 if (id->qp_type == IB_QPT_UD)
3856 ret = cma_send_sidr_rep(id_priv, IB_SIDR_REJECT, 0,
3857 private_data, private_data_len);
3858 else
3859 ret = ib_send_cm_rej(id_priv->cm_id.ib,
3860 IB_CM_REJ_CONSUMER_DEFINED, NULL,
3861 0, private_data, private_data_len);
3862 } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
3863 ret = iw_cm_reject(id_priv->cm_id.iw,
3864 private_data, private_data_len);
3865 } else
3866 ret = -ENOSYS;
3867
3868 return ret;
3869 }
3870 EXPORT_SYMBOL(rdma_reject);
3871
3872 int rdma_disconnect(struct rdma_cm_id *id)
3873 {
3874 struct rdma_id_private *id_priv;
3875 int ret;
3876
3877 id_priv = container_of(id, struct rdma_id_private, id);
3878 if (!id_priv->cm_id.ib)
3879 return -EINVAL;
3880
3881 if (rdma_cap_ib_cm(id->device, id->port_num)) {
3882 ret = cma_modify_qp_err(id_priv);
3883 if (ret)
3884 goto out;
3885 /* Initiate or respond to a disconnect. */
3886 if (ib_send_cm_dreq(id_priv->cm_id.ib, NULL, 0))
3887 ib_send_cm_drep(id_priv->cm_id.ib, NULL, 0);
3888 } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
3889 ret = iw_cm_disconnect(id_priv->cm_id.iw, 0);
3890 } else
3891 ret = -EINVAL;
3892
3893 out:
3894 return ret;
3895 }
3896 EXPORT_SYMBOL(rdma_disconnect);
3897
3898 static int cma_ib_mc_handler(int status, struct ib_sa_multicast *multicast)
3899 {
3900 struct rdma_id_private *id_priv;
3901 struct cma_multicast *mc = multicast->context;
3902 struct rdma_cm_event event;
3903 int ret = 0;
3904
3905 id_priv = mc->id_priv;
3906 mutex_lock(&id_priv->handler_mutex);
3907 if (id_priv->state != RDMA_CM_ADDR_BOUND &&
3908 id_priv->state != RDMA_CM_ADDR_RESOLVED)
3909 goto out;
3910
3911 if (!status)
3912 status = cma_set_qkey(id_priv, be32_to_cpu(multicast->rec.qkey));
3913 else
3914 pr_debug_ratelimited("RDMA CM: MULTICAST_ERROR: failed to join multicast. status %d\n",
3915 status);
3916 mutex_lock(&id_priv->qp_mutex);
3917 if (!status && id_priv->id.qp) {
3918 status = ib_attach_mcast(id_priv->id.qp, &multicast->rec.mgid,
3919 be16_to_cpu(multicast->rec.mlid));
3920 if (status)
3921 pr_debug_ratelimited("RDMA CM: MULTICAST_ERROR: failed to attach QP. status %d\n",
3922 status);
3923 }
3924 mutex_unlock(&id_priv->qp_mutex);
3925
3926 memset(&event, 0, sizeof event);
3927 event.status = status;
3928 event.param.ud.private_data = mc->context;
3929 if (!status) {
3930 struct rdma_dev_addr *dev_addr =
3931 &id_priv->id.route.addr.dev_addr;
3932 struct net_device *ndev =
3933 dev_get_by_index(dev_addr->net, dev_addr->bound_dev_if);
3934 enum ib_gid_type gid_type =
3935 id_priv->cma_dev->default_gid_type[id_priv->id.port_num -
3936 rdma_start_port(id_priv->cma_dev->device)];
3937
3938 event.event = RDMA_CM_EVENT_MULTICAST_JOIN;
3939 ib_init_ah_from_mcmember(id_priv->id.device,
3940 id_priv->id.port_num, &multicast->rec,
3941 ndev, gid_type,
3942 &event.param.ud.ah_attr);
3943 event.param.ud.qp_num = 0xFFFFFF;
3944 event.param.ud.qkey = be32_to_cpu(multicast->rec.qkey);
3945 if (ndev)
3946 dev_put(ndev);
3947 } else
3948 event.event = RDMA_CM_EVENT_MULTICAST_ERROR;
3949
3950 ret = id_priv->id.event_handler(&id_priv->id, &event);
3951 if (ret) {
3952 cma_exch(id_priv, RDMA_CM_DESTROYING);
3953 mutex_unlock(&id_priv->handler_mutex);
3954 rdma_destroy_id(&id_priv->id);
3955 return 0;
3956 }
3957
3958 out:
3959 mutex_unlock(&id_priv->handler_mutex);
3960 return 0;
3961 }
3962
3963 static void cma_set_mgid(struct rdma_id_private *id_priv,
3964 struct sockaddr *addr, union ib_gid *mgid)
3965 {
3966 unsigned char mc_map[MAX_ADDR_LEN];
3967 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
3968 struct sockaddr_in *sin = (struct sockaddr_in *) addr;
3969 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) addr;
3970
3971 if (cma_any_addr(addr)) {
3972 memset(mgid, 0, sizeof *mgid);
3973 } else if ((addr->sa_family == AF_INET6) &&
3974 ((be32_to_cpu(sin6->sin6_addr.s6_addr32[0]) & 0xFFF0FFFF) ==
3975 0xFF10A01B)) {
3976 /* IPv6 address is an SA assigned MGID. */
3977 memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
3978 } else if (addr->sa_family == AF_IB) {
3979 memcpy(mgid, &((struct sockaddr_ib *) addr)->sib_addr, sizeof *mgid);
3980 } else if ((addr->sa_family == AF_INET6)) {
3981 ipv6_ib_mc_map(&sin6->sin6_addr, dev_addr->broadcast, mc_map);
3982 if (id_priv->id.ps == RDMA_PS_UDP)
3983 mc_map[7] = 0x01; /* Use RDMA CM signature */
3984 *mgid = *(union ib_gid *) (mc_map + 4);
3985 } else {
3986 ip_ib_mc_map(sin->sin_addr.s_addr, dev_addr->broadcast, mc_map);
3987 if (id_priv->id.ps == RDMA_PS_UDP)
3988 mc_map[7] = 0x01; /* Use RDMA CM signature */
3989 *mgid = *(union ib_gid *) (mc_map + 4);
3990 }
3991 }
3992
3993 static int cma_join_ib_multicast(struct rdma_id_private *id_priv,
3994 struct cma_multicast *mc)
3995 {
3996 struct ib_sa_mcmember_rec rec;
3997 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
3998 ib_sa_comp_mask comp_mask;
3999 int ret;
4000
4001 ib_addr_get_mgid(dev_addr, &rec.mgid);
4002 ret = ib_sa_get_mcmember_rec(id_priv->id.device, id_priv->id.port_num,
4003 &rec.mgid, &rec);
4004 if (ret)
4005 return ret;
4006
4007 ret = cma_set_qkey(id_priv, 0);
4008 if (ret)
4009 return ret;
4010
4011 cma_set_mgid(id_priv, (struct sockaddr *) &mc->addr, &rec.mgid);
4012 rec.qkey = cpu_to_be32(id_priv->qkey);
4013 rdma_addr_get_sgid(dev_addr, &rec.port_gid);
4014 rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
4015 rec.join_state = mc->join_state;
4016
4017 if ((rec.join_state == BIT(SENDONLY_FULLMEMBER_JOIN)) &&
4018 (!ib_sa_sendonly_fullmem_support(&sa_client,
4019 id_priv->id.device,
4020 id_priv->id.port_num))) {
4021 pr_warn("RDMA CM: %s port %u Unable to multicast join\n"
4022 "RDMA CM: SM doesn't support Send Only Full Member option\n",
4023 id_priv->id.device->name, id_priv->id.port_num);
4024 return -EOPNOTSUPP;
4025 }
4026
4027 comp_mask = IB_SA_MCMEMBER_REC_MGID | IB_SA_MCMEMBER_REC_PORT_GID |
4028 IB_SA_MCMEMBER_REC_PKEY | IB_SA_MCMEMBER_REC_JOIN_STATE |
4029 IB_SA_MCMEMBER_REC_QKEY | IB_SA_MCMEMBER_REC_SL |
4030 IB_SA_MCMEMBER_REC_FLOW_LABEL |
4031 IB_SA_MCMEMBER_REC_TRAFFIC_CLASS;
4032
4033 if (id_priv->id.ps == RDMA_PS_IPOIB)
4034 comp_mask |= IB_SA_MCMEMBER_REC_RATE |
4035 IB_SA_MCMEMBER_REC_RATE_SELECTOR |
4036 IB_SA_MCMEMBER_REC_MTU_SELECTOR |
4037 IB_SA_MCMEMBER_REC_MTU |
4038 IB_SA_MCMEMBER_REC_HOP_LIMIT;
4039
4040 mc->multicast.ib = ib_sa_join_multicast(&sa_client, id_priv->id.device,
4041 id_priv->id.port_num, &rec,
4042 comp_mask, GFP_KERNEL,
4043 cma_ib_mc_handler, mc);
4044 return PTR_ERR_OR_ZERO(mc->multicast.ib);
4045 }
4046
4047 static void iboe_mcast_work_handler(struct work_struct *work)
4048 {
4049 struct iboe_mcast_work *mw = container_of(work, struct iboe_mcast_work, work);
4050 struct cma_multicast *mc = mw->mc;
4051 struct ib_sa_multicast *m = mc->multicast.ib;
4052
4053 mc->multicast.ib->context = mc;
4054 cma_ib_mc_handler(0, m);
4055 kref_put(&mc->mcref, release_mc);
4056 kfree(mw);
4057 }
4058
4059 static void cma_iboe_set_mgid(struct sockaddr *addr, union ib_gid *mgid,
4060 enum ib_gid_type gid_type)
4061 {
4062 struct sockaddr_in *sin = (struct sockaddr_in *)addr;
4063 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr;
4064
4065 if (cma_any_addr(addr)) {
4066 memset(mgid, 0, sizeof *mgid);
4067 } else if (addr->sa_family == AF_INET6) {
4068 memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
4069 } else {
4070 mgid->raw[0] =
4071 (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) ? 0 : 0xff;
4072 mgid->raw[1] =
4073 (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) ? 0 : 0x0e;
4074 mgid->raw[2] = 0;
4075 mgid->raw[3] = 0;
4076 mgid->raw[4] = 0;
4077 mgid->raw[5] = 0;
4078 mgid->raw[6] = 0;
4079 mgid->raw[7] = 0;
4080 mgid->raw[8] = 0;
4081 mgid->raw[9] = 0;
4082 mgid->raw[10] = 0xff;
4083 mgid->raw[11] = 0xff;
4084 *(__be32 *)(&mgid->raw[12]) = sin->sin_addr.s_addr;
4085 }
4086 }
4087
4088 static int cma_iboe_join_multicast(struct rdma_id_private *id_priv,
4089 struct cma_multicast *mc)
4090 {
4091 struct iboe_mcast_work *work;
4092 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
4093 int err = 0;
4094 struct sockaddr *addr = (struct sockaddr *)&mc->addr;
4095 struct net_device *ndev = NULL;
4096 enum ib_gid_type gid_type;
4097 bool send_only;
4098
4099 send_only = mc->join_state == BIT(SENDONLY_FULLMEMBER_JOIN);
4100
4101 if (cma_zero_addr((struct sockaddr *)&mc->addr))
4102 return -EINVAL;
4103
4104 work = kzalloc(sizeof *work, GFP_KERNEL);
4105 if (!work)
4106 return -ENOMEM;
4107
4108 mc->multicast.ib = kzalloc(sizeof(struct ib_sa_multicast), GFP_KERNEL);
4109 if (!mc->multicast.ib) {
4110 err = -ENOMEM;
4111 goto out1;
4112 }
4113
4114 gid_type = id_priv->cma_dev->default_gid_type[id_priv->id.port_num -
4115 rdma_start_port(id_priv->cma_dev->device)];
4116 cma_iboe_set_mgid(addr, &mc->multicast.ib->rec.mgid, gid_type);
4117
4118 mc->multicast.ib->rec.pkey = cpu_to_be16(0xffff);
4119 if (id_priv->id.ps == RDMA_PS_UDP)
4120 mc->multicast.ib->rec.qkey = cpu_to_be32(RDMA_UDP_QKEY);
4121
4122 if (dev_addr->bound_dev_if)
4123 ndev = dev_get_by_index(dev_addr->net, dev_addr->bound_dev_if);
4124 if (!ndev) {
4125 err = -ENODEV;
4126 goto out2;
4127 }
4128 mc->multicast.ib->rec.rate = iboe_get_rate(ndev);
4129 mc->multicast.ib->rec.hop_limit = 1;
4130 mc->multicast.ib->rec.mtu = iboe_get_mtu(ndev->mtu);
4131
4132 if (addr->sa_family == AF_INET) {
4133 if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) {
4134 mc->multicast.ib->rec.hop_limit = IPV6_DEFAULT_HOPLIMIT;
4135 if (!send_only) {
4136 err = cma_igmp_send(ndev, &mc->multicast.ib->rec.mgid,
4137 true);
4138 if (!err)
4139 mc->igmp_joined = true;
4140 }
4141 }
4142 } else {
4143 if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP)
4144 err = -ENOTSUPP;
4145 }
4146 dev_put(ndev);
4147 if (err || !mc->multicast.ib->rec.mtu) {
4148 if (!err)
4149 err = -EINVAL;
4150 goto out2;
4151 }
4152 rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
4153 &mc->multicast.ib->rec.port_gid);
4154 work->id = id_priv;
4155 work->mc = mc;
4156 INIT_WORK(&work->work, iboe_mcast_work_handler);
4157 kref_get(&mc->mcref);
4158 queue_work(cma_wq, &work->work);
4159
4160 return 0;
4161
4162 out2:
4163 kfree(mc->multicast.ib);
4164 out1:
4165 kfree(work);
4166 return err;
4167 }
4168
4169 int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
4170 u8 join_state, void *context)
4171 {
4172 struct rdma_id_private *id_priv;
4173 struct cma_multicast *mc;
4174 int ret;
4175
4176 id_priv = container_of(id, struct rdma_id_private, id);
4177 if (!cma_comp(id_priv, RDMA_CM_ADDR_BOUND) &&
4178 !cma_comp(id_priv, RDMA_CM_ADDR_RESOLVED))
4179 return -EINVAL;
4180
4181 mc = kmalloc(sizeof *mc, GFP_KERNEL);
4182 if (!mc)
4183 return -ENOMEM;
4184
4185 memcpy(&mc->addr, addr, rdma_addr_size(addr));
4186 mc->context = context;
4187 mc->id_priv = id_priv;
4188 mc->igmp_joined = false;
4189 mc->join_state = join_state;
4190 spin_lock(&id_priv->lock);
4191 list_add(&mc->list, &id_priv->mc_list);
4192 spin_unlock(&id_priv->lock);
4193
4194 if (rdma_protocol_roce(id->device, id->port_num)) {
4195 kref_init(&mc->mcref);
4196 ret = cma_iboe_join_multicast(id_priv, mc);
4197 } else if (rdma_cap_ib_mcast(id->device, id->port_num))
4198 ret = cma_join_ib_multicast(id_priv, mc);
4199 else
4200 ret = -ENOSYS;
4201
4202 if (ret) {
4203 spin_lock_irq(&id_priv->lock);
4204 list_del(&mc->list);
4205 spin_unlock_irq(&id_priv->lock);
4206 kfree(mc);
4207 }
4208 return ret;
4209 }
4210 EXPORT_SYMBOL(rdma_join_multicast);
4211
4212 void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr)
4213 {
4214 struct rdma_id_private *id_priv;
4215 struct cma_multicast *mc;
4216
4217 id_priv = container_of(id, struct rdma_id_private, id);
4218 spin_lock_irq(&id_priv->lock);
4219 list_for_each_entry(mc, &id_priv->mc_list, list) {
4220 if (!memcmp(&mc->addr, addr, rdma_addr_size(addr))) {
4221 list_del(&mc->list);
4222 spin_unlock_irq(&id_priv->lock);
4223
4224 if (id->qp)
4225 ib_detach_mcast(id->qp,
4226 &mc->multicast.ib->rec.mgid,
4227 be16_to_cpu(mc->multicast.ib->rec.mlid));
4228
4229 BUG_ON(id_priv->cma_dev->device != id->device);
4230
4231 if (rdma_cap_ib_mcast(id->device, id->port_num)) {
4232 ib_sa_free_multicast(mc->multicast.ib);
4233 kfree(mc);
4234 } else if (rdma_protocol_roce(id->device, id->port_num)) {
4235 if (mc->igmp_joined) {
4236 struct rdma_dev_addr *dev_addr =
4237 &id->route.addr.dev_addr;
4238 struct net_device *ndev = NULL;
4239
4240 if (dev_addr->bound_dev_if)
4241 ndev = dev_get_by_index(dev_addr->net,
4242 dev_addr->bound_dev_if);
4243 if (ndev) {
4244 cma_igmp_send(ndev,
4245 &mc->multicast.ib->rec.mgid,
4246 false);
4247 dev_put(ndev);
4248 }
4249 mc->igmp_joined = false;
4250 }
4251 kref_put(&mc->mcref, release_mc);
4252 }
4253 return;
4254 }
4255 }
4256 spin_unlock_irq(&id_priv->lock);
4257 }
4258 EXPORT_SYMBOL(rdma_leave_multicast);
4259
4260 static int cma_netdev_change(struct net_device *ndev, struct rdma_id_private *id_priv)
4261 {
4262 struct rdma_dev_addr *dev_addr;
4263 struct cma_ndev_work *work;
4264
4265 dev_addr = &id_priv->id.route.addr.dev_addr;
4266
4267 if ((dev_addr->bound_dev_if == ndev->ifindex) &&
4268 (net_eq(dev_net(ndev), dev_addr->net)) &&
4269 memcmp(dev_addr->src_dev_addr, ndev->dev_addr, ndev->addr_len)) {
4270 pr_info("RDMA CM addr change for ndev %s used by id %p\n",
4271 ndev->name, &id_priv->id);
4272 work = kzalloc(sizeof *work, GFP_KERNEL);
4273 if (!work)
4274 return -ENOMEM;
4275
4276 INIT_WORK(&work->work, cma_ndev_work_handler);
4277 work->id = id_priv;
4278 work->event.event = RDMA_CM_EVENT_ADDR_CHANGE;
4279 atomic_inc(&id_priv->refcount);
4280 queue_work(cma_wq, &work->work);
4281 }
4282
4283 return 0;
4284 }
4285
4286 static int cma_netdev_callback(struct notifier_block *self, unsigned long event,
4287 void *ptr)
4288 {
4289 struct net_device *ndev = netdev_notifier_info_to_dev(ptr);
4290 struct cma_device *cma_dev;
4291 struct rdma_id_private *id_priv;
4292 int ret = NOTIFY_DONE;
4293
4294 if (event != NETDEV_BONDING_FAILOVER)
4295 return NOTIFY_DONE;
4296
4297 if (!netif_is_bond_master(ndev))
4298 return NOTIFY_DONE;
4299
4300 mutex_lock(&lock);
4301 list_for_each_entry(cma_dev, &dev_list, list)
4302 list_for_each_entry(id_priv, &cma_dev->id_list, list) {
4303 ret = cma_netdev_change(ndev, id_priv);
4304 if (ret)
4305 goto out;
4306 }
4307
4308 out:
4309 mutex_unlock(&lock);
4310 return ret;
4311 }
4312
4313 static struct notifier_block cma_nb = {
4314 .notifier_call = cma_netdev_callback
4315 };
4316
4317 static void cma_add_one(struct ib_device *device)
4318 {
4319 struct cma_device *cma_dev;
4320 struct rdma_id_private *id_priv;
4321 unsigned int i;
4322 unsigned long supported_gids = 0;
4323
4324 cma_dev = kmalloc(sizeof *cma_dev, GFP_KERNEL);
4325 if (!cma_dev)
4326 return;
4327
4328 cma_dev->device = device;
4329 cma_dev->default_gid_type = kcalloc(device->phys_port_cnt,
4330 sizeof(*cma_dev->default_gid_type),
4331 GFP_KERNEL);
4332 if (!cma_dev->default_gid_type)
4333 goto free_cma_dev;
4334
4335 cma_dev->default_roce_tos = kcalloc(device->phys_port_cnt,
4336 sizeof(*cma_dev->default_roce_tos),
4337 GFP_KERNEL);
4338 if (!cma_dev->default_roce_tos)
4339 goto free_gid_type;
4340
4341 for (i = rdma_start_port(device); i <= rdma_end_port(device); i++) {
4342 supported_gids = roce_gid_type_mask_support(device, i);
4343 WARN_ON(!supported_gids);
4344 if (supported_gids & (1 << CMA_PREFERRED_ROCE_GID_TYPE))
4345 cma_dev->default_gid_type[i - rdma_start_port(device)] =
4346 CMA_PREFERRED_ROCE_GID_TYPE;
4347 else
4348 cma_dev->default_gid_type[i - rdma_start_port(device)] =
4349 find_first_bit(&supported_gids, BITS_PER_LONG);
4350 cma_dev->default_roce_tos[i - rdma_start_port(device)] = 0;
4351 }
4352
4353 init_completion(&cma_dev->comp);
4354 atomic_set(&cma_dev->refcount, 1);
4355 INIT_LIST_HEAD(&cma_dev->id_list);
4356 ib_set_client_data(device, &cma_client, cma_dev);
4357
4358 mutex_lock(&lock);
4359 list_add_tail(&cma_dev->list, &dev_list);
4360 list_for_each_entry(id_priv, &listen_any_list, list)
4361 cma_listen_on_dev(id_priv, cma_dev);
4362 mutex_unlock(&lock);
4363
4364 return;
4365
4366 free_gid_type:
4367 kfree(cma_dev->default_gid_type);
4368
4369 free_cma_dev:
4370 kfree(cma_dev);
4371
4372 return;
4373 }
4374
4375 static int cma_remove_id_dev(struct rdma_id_private *id_priv)
4376 {
4377 struct rdma_cm_event event;
4378 enum rdma_cm_state state;
4379 int ret = 0;
4380
4381 /* Record that we want to remove the device */
4382 state = cma_exch(id_priv, RDMA_CM_DEVICE_REMOVAL);
4383 if (state == RDMA_CM_DESTROYING)
4384 return 0;
4385
4386 cma_cancel_operation(id_priv, state);
4387 mutex_lock(&id_priv->handler_mutex);
4388
4389 /* Check for destruction from another callback. */
4390 if (!cma_comp(id_priv, RDMA_CM_DEVICE_REMOVAL))
4391 goto out;
4392
4393 memset(&event, 0, sizeof event);
4394 event.event = RDMA_CM_EVENT_DEVICE_REMOVAL;
4395 ret = id_priv->id.event_handler(&id_priv->id, &event);
4396 out:
4397 mutex_unlock(&id_priv->handler_mutex);
4398 return ret;
4399 }
4400
4401 static void cma_process_remove(struct cma_device *cma_dev)
4402 {
4403 struct rdma_id_private *id_priv;
4404 int ret;
4405
4406 mutex_lock(&lock);
4407 while (!list_empty(&cma_dev->id_list)) {
4408 id_priv = list_entry(cma_dev->id_list.next,
4409 struct rdma_id_private, list);
4410
4411 list_del(&id_priv->listen_list);
4412 list_del_init(&id_priv->list);
4413 atomic_inc(&id_priv->refcount);
4414 mutex_unlock(&lock);
4415
4416 ret = id_priv->internal_id ? 1 : cma_remove_id_dev(id_priv);
4417 cma_deref_id(id_priv);
4418 if (ret)
4419 rdma_destroy_id(&id_priv->id);
4420
4421 mutex_lock(&lock);
4422 }
4423 mutex_unlock(&lock);
4424
4425 cma_deref_dev(cma_dev);
4426 wait_for_completion(&cma_dev->comp);
4427 }
4428
4429 static void cma_remove_one(struct ib_device *device, void *client_data)
4430 {
4431 struct cma_device *cma_dev = client_data;
4432
4433 if (!cma_dev)
4434 return;
4435
4436 mutex_lock(&lock);
4437 list_del(&cma_dev->list);
4438 mutex_unlock(&lock);
4439
4440 cma_process_remove(cma_dev);
4441 kfree(cma_dev->default_roce_tos);
4442 kfree(cma_dev->default_gid_type);
4443 kfree(cma_dev);
4444 }
4445
4446 static int cma_get_id_stats(struct sk_buff *skb, struct netlink_callback *cb)
4447 {
4448 struct nlmsghdr *nlh;
4449 struct rdma_cm_id_stats *id_stats;
4450 struct rdma_id_private *id_priv;
4451 struct rdma_cm_id *id = NULL;
4452 struct cma_device *cma_dev;
4453 int i_dev = 0, i_id = 0;
4454
4455 /*
4456 * We export all of the IDs as a sequence of messages. Each
4457 * ID gets its own netlink message.
4458 */
4459 mutex_lock(&lock);
4460
4461 list_for_each_entry(cma_dev, &dev_list, list) {
4462 if (i_dev < cb->args[0]) {
4463 i_dev++;
4464 continue;
4465 }
4466
4467 i_id = 0;
4468 list_for_each_entry(id_priv, &cma_dev->id_list, list) {
4469 if (i_id < cb->args[1]) {
4470 i_id++;
4471 continue;
4472 }
4473
4474 id_stats = ibnl_put_msg(skb, &nlh, cb->nlh->nlmsg_seq,
4475 sizeof *id_stats, RDMA_NL_RDMA_CM,
4476 RDMA_NL_RDMA_CM_ID_STATS,
4477 NLM_F_MULTI);
4478 if (!id_stats)
4479 goto out;
4480
4481 memset(id_stats, 0, sizeof *id_stats);
4482 id = &id_priv->id;
4483 id_stats->node_type = id->route.addr.dev_addr.dev_type;
4484 id_stats->port_num = id->port_num;
4485 id_stats->bound_dev_if =
4486 id->route.addr.dev_addr.bound_dev_if;
4487
4488 if (ibnl_put_attr(skb, nlh,
4489 rdma_addr_size(cma_src_addr(id_priv)),
4490 cma_src_addr(id_priv),
4491 RDMA_NL_RDMA_CM_ATTR_SRC_ADDR))
4492 goto out;
4493 if (ibnl_put_attr(skb, nlh,
4494 rdma_addr_size(cma_dst_addr(id_priv)),
4495 cma_dst_addr(id_priv),
4496 RDMA_NL_RDMA_CM_ATTR_DST_ADDR))
4497 goto out;
4498
4499 id_stats->pid = id_priv->owner;
4500 id_stats->port_space = id->ps;
4501 id_stats->cm_state = id_priv->state;
4502 id_stats->qp_num = id_priv->qp_num;
4503 id_stats->qp_type = id->qp_type;
4504
4505 i_id++;
4506 nlmsg_end(skb, nlh);
4507 }
4508
4509 cb->args[1] = 0;
4510 i_dev++;
4511 }
4512
4513 out:
4514 mutex_unlock(&lock);
4515 cb->args[0] = i_dev;
4516 cb->args[1] = i_id;
4517
4518 return skb->len;
4519 }
4520
4521 static const struct rdma_nl_cbs cma_cb_table[RDMA_NL_RDMA_CM_NUM_OPS] = {
4522 [RDMA_NL_RDMA_CM_ID_STATS] = { .dump = cma_get_id_stats},
4523 };
4524
4525 static int cma_init_net(struct net *net)
4526 {
4527 struct cma_pernet *pernet = cma_pernet(net);
4528
4529 idr_init(&pernet->tcp_ps);
4530 idr_init(&pernet->udp_ps);
4531 idr_init(&pernet->ipoib_ps);
4532 idr_init(&pernet->ib_ps);
4533
4534 return 0;
4535 }
4536
4537 static void cma_exit_net(struct net *net)
4538 {
4539 struct cma_pernet *pernet = cma_pernet(net);
4540
4541 idr_destroy(&pernet->tcp_ps);
4542 idr_destroy(&pernet->udp_ps);
4543 idr_destroy(&pernet->ipoib_ps);
4544 idr_destroy(&pernet->ib_ps);
4545 }
4546
4547 static struct pernet_operations cma_pernet_operations = {
4548 .init = cma_init_net,
4549 .exit = cma_exit_net,
4550 .id = &cma_pernet_id,
4551 .size = sizeof(struct cma_pernet),
4552 };
4553
4554 static int __init cma_init(void)
4555 {
4556 int ret;
4557
4558 cma_wq = alloc_ordered_workqueue("rdma_cm", WQ_MEM_RECLAIM);
4559 if (!cma_wq)
4560 return -ENOMEM;
4561
4562 ret = register_pernet_subsys(&cma_pernet_operations);
4563 if (ret)
4564 goto err_wq;
4565
4566 ib_sa_register_client(&sa_client);
4567 rdma_addr_register_client(&addr_client);
4568 register_netdevice_notifier(&cma_nb);
4569
4570 ret = ib_register_client(&cma_client);
4571 if (ret)
4572 goto err;
4573
4574 rdma_nl_register(RDMA_NL_RDMA_CM, cma_cb_table);
4575 cma_configfs_init();
4576
4577 return 0;
4578
4579 err:
4580 unregister_netdevice_notifier(&cma_nb);
4581 rdma_addr_unregister_client(&addr_client);
4582 ib_sa_unregister_client(&sa_client);
4583 err_wq:
4584 destroy_workqueue(cma_wq);
4585 return ret;
4586 }
4587
4588 static void __exit cma_cleanup(void)
4589 {
4590 cma_configfs_exit();
4591 rdma_nl_unregister(RDMA_NL_RDMA_CM);
4592 ib_unregister_client(&cma_client);
4593 unregister_netdevice_notifier(&cma_nb);
4594 rdma_addr_unregister_client(&addr_client);
4595 ib_sa_unregister_client(&sa_client);
4596 unregister_pernet_subsys(&cma_pernet_operations);
4597 destroy_workqueue(cma_wq);
4598 }
4599
4600 MODULE_ALIAS_RDMA_NETLINK(RDMA_NL_RDMA_CM, 1);
4601
4602 module_init(cma_init);
4603 module_exit(cma_cleanup);
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