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