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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / infiniband / core / cma.c
blob72f032160c4bd92ff54561463438d5b27dd4ee51
1 // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
2 /*
3 * Copyright (c) 2005 Voltaire Inc. All rights reserved.
4 * Copyright (c) 2002-2005, Network Appliance, Inc. All rights reserved.
5 * Copyright (c) 1999-2019, Mellanox Technologies, Inc. All rights reserved.
6 * Copyright (c) 2005-2006 Intel Corporation. All rights reserved.
7 */
8
9 #include <linux/completion.h>
10 #include <linux/in.h>
11 #include <linux/in6.h>
12 #include <linux/mutex.h>
13 #include <linux/random.h>
14 #include <linux/igmp.h>
15 #include <linux/xarray.h>
16 #include <linux/inetdevice.h>
17 #include <linux/slab.h>
18 #include <linux/module.h>
19 #include <net/route.h>
20
21 #include <net/net_namespace.h>
22 #include <net/netns/generic.h>
23 #include <net/tcp.h>
24 #include <net/ipv6.h>
25 #include <net/ip_fib.h>
26 #include <net/ip6_route.h>
27
28 #include <rdma/rdma_cm.h>
29 #include <rdma/rdma_cm_ib.h>
30 #include <rdma/rdma_netlink.h>
31 #include <rdma/ib.h>
32 #include <rdma/ib_cache.h>
33 #include <rdma/ib_cm.h>
34 #include <rdma/ib_sa.h>
35 #include <rdma/iw_cm.h>
36
37 #include "core_priv.h"
38 #include "cma_priv.h"
39 #include "cma_trace.h"
40
41 MODULE_AUTHOR("Sean Hefty");
42 MODULE_DESCRIPTION("Generic RDMA CM Agent");
43 MODULE_LICENSE("Dual BSD/GPL");
44
45 #define CMA_CM_RESPONSE_TIMEOUT 20
46 #define CMA_QUERY_CLASSPORT_INFO_TIMEOUT 3000
47 #define CMA_MAX_CM_RETRIES 15
48 #define CMA_CM_MRA_SETTING (IB_CM_MRA_FLAG_DELAY | 24)
49 #define CMA_IBOE_PACKET_LIFETIME 18
50 #define CMA_PREFERRED_ROCE_GID_TYPE IB_GID_TYPE_ROCE_UDP_ENCAP
51
52 static const char * const cma_events[] = {
53 [RDMA_CM_EVENT_ADDR_RESOLVED] = "address resolved",
54 [RDMA_CM_EVENT_ADDR_ERROR] = "address error",
55 [RDMA_CM_EVENT_ROUTE_RESOLVED] = "route resolved ",
56 [RDMA_CM_EVENT_ROUTE_ERROR] = "route error",
57 [RDMA_CM_EVENT_CONNECT_REQUEST] = "connect request",
58 [RDMA_CM_EVENT_CONNECT_RESPONSE] = "connect response",
59 [RDMA_CM_EVENT_CONNECT_ERROR] = "connect error",
60 [RDMA_CM_EVENT_UNREACHABLE] = "unreachable",
61 [RDMA_CM_EVENT_REJECTED] = "rejected",
62 [RDMA_CM_EVENT_ESTABLISHED] = "established",
63 [RDMA_CM_EVENT_DISCONNECTED] = "disconnected",
64 [RDMA_CM_EVENT_DEVICE_REMOVAL] = "device removal",
65 [RDMA_CM_EVENT_MULTICAST_JOIN] = "multicast join",
66 [RDMA_CM_EVENT_MULTICAST_ERROR] = "multicast error",
67 [RDMA_CM_EVENT_ADDR_CHANGE] = "address change",
68 [RDMA_CM_EVENT_TIMEWAIT_EXIT] = "timewait exit",
69 };
70
71 const char *__attribute_const__ rdma_event_msg(enum rdma_cm_event_type event)
72 {
73 size_t index = event;
74
75 return (index < ARRAY_SIZE(cma_events) && cma_events[index]) ?
76 cma_events[index] : "unrecognized event";
77 }
78 EXPORT_SYMBOL(rdma_event_msg);
79
80 const char *__attribute_const__ rdma_reject_msg(struct rdma_cm_id *id,
81 int reason)
82 {
83 if (rdma_ib_or_roce(id->device, id->port_num))
84 return ibcm_reject_msg(reason);
85
86 if (rdma_protocol_iwarp(id->device, id->port_num))
87 return iwcm_reject_msg(reason);
88
89 WARN_ON_ONCE(1);
90 return "unrecognized transport";
91 }
92 EXPORT_SYMBOL(rdma_reject_msg);
93
94 bool rdma_is_consumer_reject(struct rdma_cm_id *id, int reason)
95 {
96 if (rdma_ib_or_roce(id->device, id->port_num))
97 return reason == IB_CM_REJ_CONSUMER_DEFINED;
98
99 if (rdma_protocol_iwarp(id->device, id->port_num))
100 return reason == -ECONNREFUSED;
101
102 WARN_ON_ONCE(1);
103 return false;
104 }
105 EXPORT_SYMBOL(rdma_is_consumer_reject);
106
107 const void *rdma_consumer_reject_data(struct rdma_cm_id *id,
108 struct rdma_cm_event *ev, u8 *data_len)
109 {
110 const void *p;
111
112 if (rdma_is_consumer_reject(id, ev->status)) {
113 *data_len = ev->param.conn.private_data_len;
114 p = ev->param.conn.private_data;
115 } else {
116 *data_len = 0;
117 p = NULL;
118 }
119 return p;
120 }
121 EXPORT_SYMBOL(rdma_consumer_reject_data);
122
123 /**
124 * rdma_iw_cm_id() - return the iw_cm_id pointer for this cm_id.
125 * @id: Communication Identifier
126 */
127 struct iw_cm_id *rdma_iw_cm_id(struct rdma_cm_id *id)
128 {
129 struct rdma_id_private *id_priv;
130
131 id_priv = container_of(id, struct rdma_id_private, id);
132 if (id->device->node_type == RDMA_NODE_RNIC)
133 return id_priv->cm_id.iw;
134 return NULL;
135 }
136 EXPORT_SYMBOL(rdma_iw_cm_id);
137
138 /**
139 * rdma_res_to_id() - return the rdma_cm_id pointer for this restrack.
140 * @res: rdma resource tracking entry pointer
141 */
142 struct rdma_cm_id *rdma_res_to_id(struct rdma_restrack_entry *res)
143 {
144 struct rdma_id_private *id_priv =
145 container_of(res, struct rdma_id_private, res);
146
147 return &id_priv->id;
148 }
149 EXPORT_SYMBOL(rdma_res_to_id);
150
151 static void cma_add_one(struct ib_device *device);
152 static void cma_remove_one(struct ib_device *device, void *client_data);
153
154 static struct ib_client cma_client = {
155 .name = "cma",
156 .add = cma_add_one,
157 .remove = cma_remove_one
158 };
159
160 static struct ib_sa_client sa_client;
161 static LIST_HEAD(dev_list);
162 static LIST_HEAD(listen_any_list);
163 static DEFINE_MUTEX(lock);
164 static struct workqueue_struct *cma_wq;
165 static unsigned int cma_pernet_id;
166
167 struct cma_pernet {
168 struct xarray tcp_ps;
169 struct xarray udp_ps;
170 struct xarray ipoib_ps;
171 struct xarray ib_ps;
172 };
173
174 static struct cma_pernet *cma_pernet(struct net *net)
175 {
176 return net_generic(net, cma_pernet_id);
177 }
178
179 static
180 struct xarray *cma_pernet_xa(struct net *net, enum rdma_ucm_port_space ps)
181 {
182 struct cma_pernet *pernet = cma_pernet(net);
183
184 switch (ps) {
185 case RDMA_PS_TCP:
186 return &pernet->tcp_ps;
187 case RDMA_PS_UDP:
188 return &pernet->udp_ps;
189 case RDMA_PS_IPOIB:
190 return &pernet->ipoib_ps;
191 case RDMA_PS_IB:
192 return &pernet->ib_ps;
193 default:
194 return NULL;
195 }
196 }
197
198 struct cma_device {
199 struct list_head list;
200 struct ib_device *device;
201 struct completion comp;
202 atomic_t refcount;
203 struct list_head id_list;
204 enum ib_gid_type *default_gid_type;
205 u8 *default_roce_tos;
206 };
207
208 struct rdma_bind_list {
209 enum rdma_ucm_port_space ps;
210 struct hlist_head owners;
211 unsigned short port;
212 };
213
214 struct class_port_info_context {
215 struct ib_class_port_info *class_port_info;
216 struct ib_device *device;
217 struct completion done;
218 struct ib_sa_query *sa_query;
219 u8 port_num;
220 };
221
222 static int cma_ps_alloc(struct net *net, enum rdma_ucm_port_space ps,
223 struct rdma_bind_list *bind_list, int snum)
224 {
225 struct xarray *xa = cma_pernet_xa(net, ps);
226
227 return xa_insert(xa, snum, bind_list, GFP_KERNEL);
228 }
229
230 static struct rdma_bind_list *cma_ps_find(struct net *net,
231 enum rdma_ucm_port_space ps, int snum)
232 {
233 struct xarray *xa = cma_pernet_xa(net, ps);
234
235 return xa_load(xa, snum);
236 }
237
238 static void cma_ps_remove(struct net *net, enum rdma_ucm_port_space ps,
239 int snum)
240 {
241 struct xarray *xa = cma_pernet_xa(net, ps);
242
243 xa_erase(xa, snum);
244 }
245
246 enum {
247 CMA_OPTION_AFONLY,
248 };
249
250 void cma_ref_dev(struct cma_device *cma_dev)
251 {
252 atomic_inc(&cma_dev->refcount);
253 }
254
255 struct cma_device *cma_enum_devices_by_ibdev(cma_device_filter filter,
256 void *cookie)
257 {
258 struct cma_device *cma_dev;
259 struct cma_device *found_cma_dev = NULL;
260
261 mutex_lock(&lock);
262
263 list_for_each_entry(cma_dev, &dev_list, list)
264 if (filter(cma_dev->device, cookie)) {
265 found_cma_dev = cma_dev;
266 break;
267 }
268
269 if (found_cma_dev)
270 cma_ref_dev(found_cma_dev);
271 mutex_unlock(&lock);
272 return found_cma_dev;
273 }
274
275 int cma_get_default_gid_type(struct cma_device *cma_dev,
276 unsigned int port)
277 {
278 if (!rdma_is_port_valid(cma_dev->device, port))
279 return -EINVAL;
280
281 return cma_dev->default_gid_type[port - rdma_start_port(cma_dev->device)];
282 }
283
284 int cma_set_default_gid_type(struct cma_device *cma_dev,
285 unsigned int port,
286 enum ib_gid_type default_gid_type)
287 {
288 unsigned long supported_gids;
289
290 if (!rdma_is_port_valid(cma_dev->device, port))
291 return -EINVAL;
292
293 supported_gids = roce_gid_type_mask_support(cma_dev->device, port);
294
295 if (!(supported_gids & 1 << default_gid_type))
296 return -EINVAL;
297
298 cma_dev->default_gid_type[port - rdma_start_port(cma_dev->device)] =
299 default_gid_type;
300
301 return 0;
302 }
303
304 int cma_get_default_roce_tos(struct cma_device *cma_dev, unsigned int port)
305 {
306 if (!rdma_is_port_valid(cma_dev->device, port))
307 return -EINVAL;
308
309 return cma_dev->default_roce_tos[port - rdma_start_port(cma_dev->device)];
310 }
311
312 int cma_set_default_roce_tos(struct cma_device *cma_dev, unsigned int port,
313 u8 default_roce_tos)
314 {
315 if (!rdma_is_port_valid(cma_dev->device, port))
316 return -EINVAL;
317
318 cma_dev->default_roce_tos[port - rdma_start_port(cma_dev->device)] =
319 default_roce_tos;
320
321 return 0;
322 }
323 struct ib_device *cma_get_ib_dev(struct cma_device *cma_dev)
324 {
325 return cma_dev->device;
326 }
327
328 /*
329 * Device removal can occur at anytime, so we need extra handling to
330 * serialize notifying the user of device removal with other callbacks.
331 * We do this by disabling removal notification while a callback is in process,
332 * and reporting it after the callback completes.
333 */
334
335 struct cma_multicast {
336 struct rdma_id_private *id_priv;
337 union {
338 struct ib_sa_multicast *ib;
339 } multicast;
340 struct list_head list;
341 void *context;
342 struct sockaddr_storage addr;
343 struct kref mcref;
344 u8 join_state;
345 };
346
347 struct cma_work {
348 struct work_struct work;
349 struct rdma_id_private *id;
350 enum rdma_cm_state old_state;
351 enum rdma_cm_state new_state;
352 struct rdma_cm_event event;
353 };
354
355 struct cma_ndev_work {
356 struct work_struct work;
357 struct rdma_id_private *id;
358 struct rdma_cm_event event;
359 };
360
361 struct iboe_mcast_work {
362 struct work_struct work;
363 struct rdma_id_private *id;
364 struct cma_multicast *mc;
365 };
366
367 union cma_ip_addr {
368 struct in6_addr ip6;
369 struct {
370 __be32 pad[3];
371 __be32 addr;
372 } ip4;
373 };
374
375 struct cma_hdr {
376 u8 cma_version;
377 u8 ip_version; /* IP version: 7:4 */
378 __be16 port;
379 union cma_ip_addr src_addr;
380 union cma_ip_addr dst_addr;
381 };
382
383 #define CMA_VERSION 0x00
384
385 struct cma_req_info {
386 struct sockaddr_storage listen_addr_storage;
387 struct sockaddr_storage src_addr_storage;
388 struct ib_device *device;
389 union ib_gid local_gid;
390 __be64 service_id;
391 int port;
392 bool has_gid;
393 u16 pkey;
394 };
395
396 static int cma_comp(struct rdma_id_private *id_priv, enum rdma_cm_state comp)
397 {
398 unsigned long flags;
399 int ret;
400
401 spin_lock_irqsave(&id_priv->lock, flags);
402 ret = (id_priv->state == comp);
403 spin_unlock_irqrestore(&id_priv->lock, flags);
404 return ret;
405 }
406
407 static int cma_comp_exch(struct rdma_id_private *id_priv,
408 enum rdma_cm_state comp, enum rdma_cm_state exch)
409 {
410 unsigned long flags;
411 int ret;
412
413 spin_lock_irqsave(&id_priv->lock, flags);
414 if ((ret = (id_priv->state == comp)))
415 id_priv->state = exch;
416 spin_unlock_irqrestore(&id_priv->lock, flags);
417 return ret;
418 }
419
420 static enum rdma_cm_state cma_exch(struct rdma_id_private *id_priv,
421 enum rdma_cm_state exch)
422 {
423 unsigned long flags;
424 enum rdma_cm_state old;
425
426 spin_lock_irqsave(&id_priv->lock, flags);
427 old = id_priv->state;
428 id_priv->state = exch;
429 spin_unlock_irqrestore(&id_priv->lock, flags);
430 return old;
431 }
432
433 static inline u8 cma_get_ip_ver(const struct cma_hdr *hdr)
434 {
435 return hdr->ip_version >> 4;
436 }
437
438 static inline void cma_set_ip_ver(struct cma_hdr *hdr, u8 ip_ver)
439 {
440 hdr->ip_version = (ip_ver << 4) | (hdr->ip_version & 0xF);
441 }
442
443 static int cma_igmp_send(struct net_device *ndev, union ib_gid *mgid, bool join)
444 {
445 struct in_device *in_dev = NULL;
446
447 if (ndev) {
448 rtnl_lock();
449 in_dev = __in_dev_get_rtnl(ndev);
450 if (in_dev) {
451 if (join)
452 ip_mc_inc_group(in_dev,
453 *(__be32 *)(mgid->raw + 12));
454 else
455 ip_mc_dec_group(in_dev,
456 *(__be32 *)(mgid->raw + 12));
457 }
458 rtnl_unlock();
459 }
460 return (in_dev) ? 0 : -ENODEV;
461 }
462
463 static void _cma_attach_to_dev(struct rdma_id_private *id_priv,
464 struct cma_device *cma_dev)
465 {
466 cma_ref_dev(cma_dev);
467 id_priv->cma_dev = cma_dev;
468 id_priv->id.device = cma_dev->device;
469 id_priv->id.route.addr.dev_addr.transport =
470 rdma_node_get_transport(cma_dev->device->node_type);
471 list_add_tail(&id_priv->list, &cma_dev->id_list);
472 if (id_priv->res.kern_name)
473 rdma_restrack_kadd(&id_priv->res);
474 else
475 rdma_restrack_uadd(&id_priv->res);
476 }
477
478 static void cma_attach_to_dev(struct rdma_id_private *id_priv,
479 struct cma_device *cma_dev)
480 {
481 _cma_attach_to_dev(id_priv, cma_dev);
482 id_priv->gid_type =
483 cma_dev->default_gid_type[id_priv->id.port_num -
484 rdma_start_port(cma_dev->device)];
485 }
486
487 void cma_deref_dev(struct cma_device *cma_dev)
488 {
489 if (atomic_dec_and_test(&cma_dev->refcount))
490 complete(&cma_dev->comp);
491 }
492
493 static inline void release_mc(struct kref *kref)
494 {
495 struct cma_multicast *mc = container_of(kref, struct cma_multicast, mcref);
496
497 kfree(mc->multicast.ib);
498 kfree(mc);
499 }
500
501 static void cma_release_dev(struct rdma_id_private *id_priv)
502 {
503 mutex_lock(&lock);
504 list_del(&id_priv->list);
505 cma_deref_dev(id_priv->cma_dev);
506 id_priv->cma_dev = NULL;
507 mutex_unlock(&lock);
508 }
509
510 static inline struct sockaddr *cma_src_addr(struct rdma_id_private *id_priv)
511 {
512 return (struct sockaddr *) &id_priv->id.route.addr.src_addr;
513 }
514
515 static inline struct sockaddr *cma_dst_addr(struct rdma_id_private *id_priv)
516 {
517 return (struct sockaddr *) &id_priv->id.route.addr.dst_addr;
518 }
519
520 static inline unsigned short cma_family(struct rdma_id_private *id_priv)
521 {
522 return id_priv->id.route.addr.src_addr.ss_family;
523 }
524
525 static int cma_set_qkey(struct rdma_id_private *id_priv, u32 qkey)
526 {
527 struct ib_sa_mcmember_rec rec;
528 int ret = 0;
529
530 if (id_priv->qkey) {
531 if (qkey && id_priv->qkey != qkey)
532 return -EINVAL;
533 return 0;
534 }
535
536 if (qkey) {
537 id_priv->qkey = qkey;
538 return 0;
539 }
540
541 switch (id_priv->id.ps) {
542 case RDMA_PS_UDP:
543 case RDMA_PS_IB:
544 id_priv->qkey = RDMA_UDP_QKEY;
545 break;
546 case RDMA_PS_IPOIB:
547 ib_addr_get_mgid(&id_priv->id.route.addr.dev_addr, &rec.mgid);
548 ret = ib_sa_get_mcmember_rec(id_priv->id.device,
549 id_priv->id.port_num, &rec.mgid,
550 &rec);
551 if (!ret)
552 id_priv->qkey = be32_to_cpu(rec.qkey);
553 break;
554 default:
555 break;
556 }
557 return ret;
558 }
559
560 static void cma_translate_ib(struct sockaddr_ib *sib, struct rdma_dev_addr *dev_addr)
561 {
562 dev_addr->dev_type = ARPHRD_INFINIBAND;
563 rdma_addr_set_sgid(dev_addr, (union ib_gid *) &sib->sib_addr);
564 ib_addr_set_pkey(dev_addr, ntohs(sib->sib_pkey));
565 }
566
567 static int cma_translate_addr(struct sockaddr *addr, struct rdma_dev_addr *dev_addr)
568 {
569 int ret;
570
571 if (addr->sa_family != AF_IB) {
572 ret = rdma_translate_ip(addr, dev_addr);
573 } else {
574 cma_translate_ib((struct sockaddr_ib *) addr, dev_addr);
575 ret = 0;
576 }
577
578 return ret;
579 }
580
581 static const struct ib_gid_attr *
582 cma_validate_port(struct ib_device *device, u8 port,
583 enum ib_gid_type gid_type,
584 union ib_gid *gid,
585 struct rdma_id_private *id_priv)
586 {
587 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
588 int bound_if_index = dev_addr->bound_dev_if;
589 const struct ib_gid_attr *sgid_attr;
590 int dev_type = dev_addr->dev_type;
591 struct net_device *ndev = NULL;
592
593 if (!rdma_dev_access_netns(device, id_priv->id.route.addr.dev_addr.net))
594 return ERR_PTR(-ENODEV);
595
596 if ((dev_type == ARPHRD_INFINIBAND) && !rdma_protocol_ib(device, port))
597 return ERR_PTR(-ENODEV);
598
599 if ((dev_type != ARPHRD_INFINIBAND) && rdma_protocol_ib(device, port))
600 return ERR_PTR(-ENODEV);
601
602 if (dev_type == ARPHRD_ETHER && rdma_protocol_roce(device, port)) {
603 ndev = dev_get_by_index(dev_addr->net, bound_if_index);
604 if (!ndev)
605 return ERR_PTR(-ENODEV);
606 } else {
607 gid_type = IB_GID_TYPE_IB;
608 }
609
610 sgid_attr = rdma_find_gid_by_port(device, gid, gid_type, port, ndev);
611 if (ndev)
612 dev_put(ndev);
613 return sgid_attr;
614 }
615
616 static void cma_bind_sgid_attr(struct rdma_id_private *id_priv,
617 const struct ib_gid_attr *sgid_attr)
618 {
619 WARN_ON(id_priv->id.route.addr.dev_addr.sgid_attr);
620 id_priv->id.route.addr.dev_addr.sgid_attr = sgid_attr;
621 }
622
623 /**
624 * cma_acquire_dev_by_src_ip - Acquire cma device, port, gid attribute
625 * based on source ip address.
626 * @id_priv: cm_id which should be bound to cma device
627 *
628 * cma_acquire_dev_by_src_ip() binds cm id to cma device, port and GID attribute
629 * based on source IP address. It returns 0 on success or error code otherwise.
630 * It is applicable to active and passive side cm_id.
631 */
632 static int cma_acquire_dev_by_src_ip(struct rdma_id_private *id_priv)
633 {
634 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
635 const struct ib_gid_attr *sgid_attr;
636 union ib_gid gid, iboe_gid, *gidp;
637 struct cma_device *cma_dev;
638 enum ib_gid_type gid_type;
639 int ret = -ENODEV;
640 unsigned int port;
641
642 if (dev_addr->dev_type != ARPHRD_INFINIBAND &&
643 id_priv->id.ps == RDMA_PS_IPOIB)
644 return -EINVAL;
645
646 rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
647 &iboe_gid);
648
649 memcpy(&gid, dev_addr->src_dev_addr +
650 rdma_addr_gid_offset(dev_addr), sizeof(gid));
651
652 mutex_lock(&lock);
653 list_for_each_entry(cma_dev, &dev_list, list) {
654 rdma_for_each_port (cma_dev->device, port) {
655 gidp = rdma_protocol_roce(cma_dev->device, port) ?
656 &iboe_gid : &gid;
657 gid_type = cma_dev->default_gid_type[port - 1];
658 sgid_attr = cma_validate_port(cma_dev->device, port,
659 gid_type, gidp, id_priv);
660 if (!IS_ERR(sgid_attr)) {
661 id_priv->id.port_num = port;
662 cma_bind_sgid_attr(id_priv, sgid_attr);
663 cma_attach_to_dev(id_priv, cma_dev);
664 ret = 0;
665 goto out;
666 }
667 }
668 }
669 out:
670 mutex_unlock(&lock);
671 return ret;
672 }
673
674 /**
675 * cma_ib_acquire_dev - Acquire cma device, port and SGID attribute
676 * @id_priv: cm id to bind to cma device
677 * @listen_id_priv: listener cm id to match against
678 * @req: Pointer to req structure containaining incoming
679 * request information
680 * cma_ib_acquire_dev() acquires cma device, port and SGID attribute when
681 * rdma device matches for listen_id and incoming request. It also verifies
682 * that a GID table entry is present for the source address.
683 * Returns 0 on success, or returns error code otherwise.
684 */
685 static int cma_ib_acquire_dev(struct rdma_id_private *id_priv,
686 const struct rdma_id_private *listen_id_priv,
687 struct cma_req_info *req)
688 {
689 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
690 const struct ib_gid_attr *sgid_attr;
691 enum ib_gid_type gid_type;
692 union ib_gid gid;
693
694 if (dev_addr->dev_type != ARPHRD_INFINIBAND &&
695 id_priv->id.ps == RDMA_PS_IPOIB)
696 return -EINVAL;
697
698 if (rdma_protocol_roce(req->device, req->port))
699 rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
700 &gid);
701 else
702 memcpy(&gid, dev_addr->src_dev_addr +
703 rdma_addr_gid_offset(dev_addr), sizeof(gid));
704
705 gid_type = listen_id_priv->cma_dev->default_gid_type[req->port - 1];
706 sgid_attr = cma_validate_port(req->device, req->port,
707 gid_type, &gid, id_priv);
708 if (IS_ERR(sgid_attr))
709 return PTR_ERR(sgid_attr);
710
711 id_priv->id.port_num = req->port;
712 cma_bind_sgid_attr(id_priv, sgid_attr);
713 /* Need to acquire lock to protect against reader
714 * of cma_dev->id_list such as cma_netdev_callback() and
715 * cma_process_remove().
716 */
717 mutex_lock(&lock);
718 cma_attach_to_dev(id_priv, listen_id_priv->cma_dev);
719 mutex_unlock(&lock);
720 return 0;
721 }
722
723 static int cma_iw_acquire_dev(struct rdma_id_private *id_priv,
724 const struct rdma_id_private *listen_id_priv)
725 {
726 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
727 const struct ib_gid_attr *sgid_attr;
728 struct cma_device *cma_dev;
729 enum ib_gid_type gid_type;
730 int ret = -ENODEV;
731 union ib_gid gid;
732 u8 port;
733
734 if (dev_addr->dev_type != ARPHRD_INFINIBAND &&
735 id_priv->id.ps == RDMA_PS_IPOIB)
736 return -EINVAL;
737
738 memcpy(&gid, dev_addr->src_dev_addr +
739 rdma_addr_gid_offset(dev_addr), sizeof(gid));
740
741 mutex_lock(&lock);
742
743 cma_dev = listen_id_priv->cma_dev;
744 port = listen_id_priv->id.port_num;
745 gid_type = listen_id_priv->gid_type;
746 sgid_attr = cma_validate_port(cma_dev->device, port,
747 gid_type, &gid, id_priv);
748 if (!IS_ERR(sgid_attr)) {
749 id_priv->id.port_num = port;
750 cma_bind_sgid_attr(id_priv, sgid_attr);
751 ret = 0;
752 goto out;
753 }
754
755 list_for_each_entry(cma_dev, &dev_list, list) {
756 for (port = 1; port <= cma_dev->device->phys_port_cnt; ++port) {
757 if (listen_id_priv->cma_dev == cma_dev &&
758 listen_id_priv->id.port_num == port)
759 continue;
760
761 gid_type = cma_dev->default_gid_type[port - 1];
762 sgid_attr = cma_validate_port(cma_dev->device, port,
763 gid_type, &gid, id_priv);
764 if (!IS_ERR(sgid_attr)) {
765 id_priv->id.port_num = port;
766 cma_bind_sgid_attr(id_priv, sgid_attr);
767 ret = 0;
768 goto out;
769 }
770 }
771 }
772
773 out:
774 if (!ret)
775 cma_attach_to_dev(id_priv, cma_dev);
776
777 mutex_unlock(&lock);
778 return ret;
779 }
780
781 /*
782 * Select the source IB device and address to reach the destination IB address.
783 */
784 static int cma_resolve_ib_dev(struct rdma_id_private *id_priv)
785 {
786 struct cma_device *cma_dev, *cur_dev;
787 struct sockaddr_ib *addr;
788 union ib_gid gid, sgid, *dgid;
789 u16 pkey, index;
790 u8 p;
791 enum ib_port_state port_state;
792 int i;
793
794 cma_dev = NULL;
795 addr = (struct sockaddr_ib *) cma_dst_addr(id_priv);
796 dgid = (union ib_gid *) &addr->sib_addr;
797 pkey = ntohs(addr->sib_pkey);
798
799 mutex_lock(&lock);
800 list_for_each_entry(cur_dev, &dev_list, list) {
801 for (p = 1; p <= cur_dev->device->phys_port_cnt; ++p) {
802 if (!rdma_cap_af_ib(cur_dev->device, p))
803 continue;
804
805 if (ib_find_cached_pkey(cur_dev->device, p, pkey, &index))
806 continue;
807
808 if (ib_get_cached_port_state(cur_dev->device, p, &port_state))
809 continue;
810 for (i = 0; !rdma_query_gid(cur_dev->device,
811 p, i, &gid);
812 i++) {
813 if (!memcmp(&gid, dgid, sizeof(gid))) {
814 cma_dev = cur_dev;
815 sgid = gid;
816 id_priv->id.port_num = p;
817 goto found;
818 }
819
820 if (!cma_dev && (gid.global.subnet_prefix ==
821 dgid->global.subnet_prefix) &&
822 port_state == IB_PORT_ACTIVE) {
823 cma_dev = cur_dev;
824 sgid = gid;
825 id_priv->id.port_num = p;
826 goto found;
827 }
828 }
829 }
830 }
831 mutex_unlock(&lock);
832 return -ENODEV;
833
834 found:
835 cma_attach_to_dev(id_priv, cma_dev);
836 mutex_unlock(&lock);
837 addr = (struct sockaddr_ib *)cma_src_addr(id_priv);
838 memcpy(&addr->sib_addr, &sgid, sizeof(sgid));
839 cma_translate_ib(addr, &id_priv->id.route.addr.dev_addr);
840 return 0;
841 }
842
843 static void cma_deref_id(struct rdma_id_private *id_priv)
844 {
845 if (atomic_dec_and_test(&id_priv->refcount))
846 complete(&id_priv->comp);
847 }
848
849 struct rdma_cm_id *__rdma_create_id(struct net *net,
850 rdma_cm_event_handler event_handler,
851 void *context, enum rdma_ucm_port_space ps,
852 enum ib_qp_type qp_type, const char *caller)
853 {
854 struct rdma_id_private *id_priv;
855
856 id_priv = kzalloc(sizeof *id_priv, GFP_KERNEL);
857 if (!id_priv)
858 return ERR_PTR(-ENOMEM);
859
860 rdma_restrack_set_task(&id_priv->res, caller);
861 id_priv->res.type = RDMA_RESTRACK_CM_ID;
862 id_priv->state = RDMA_CM_IDLE;
863 id_priv->id.context = context;
864 id_priv->id.event_handler = event_handler;
865 id_priv->id.ps = ps;
866 id_priv->id.qp_type = qp_type;
867 id_priv->tos_set = false;
868 id_priv->timeout_set = false;
869 id_priv->gid_type = IB_GID_TYPE_IB;
870 spin_lock_init(&id_priv->lock);
871 mutex_init(&id_priv->qp_mutex);
872 init_completion(&id_priv->comp);
873 atomic_set(&id_priv->refcount, 1);
874 mutex_init(&id_priv->handler_mutex);
875 INIT_LIST_HEAD(&id_priv->listen_list);
876 INIT_LIST_HEAD(&id_priv->mc_list);
877 get_random_bytes(&id_priv->seq_num, sizeof id_priv->seq_num);
878 id_priv->id.route.addr.dev_addr.net = get_net(net);
879 id_priv->seq_num &= 0x00ffffff;
880
881 trace_cm_id_create(id_priv);
882 return &id_priv->id;
883 }
884 EXPORT_SYMBOL(__rdma_create_id);
885
886 static int cma_init_ud_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
887 {
888 struct ib_qp_attr qp_attr;
889 int qp_attr_mask, ret;
890
891 qp_attr.qp_state = IB_QPS_INIT;
892 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
893 if (ret)
894 return ret;
895
896 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
897 if (ret)
898 return ret;
899
900 qp_attr.qp_state = IB_QPS_RTR;
901 ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE);
902 if (ret)
903 return ret;
904
905 qp_attr.qp_state = IB_QPS_RTS;
906 qp_attr.sq_psn = 0;
907 ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE | IB_QP_SQ_PSN);
908
909 return ret;
910 }
911
912 static int cma_init_conn_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
913 {
914 struct ib_qp_attr qp_attr;
915 int qp_attr_mask, ret;
916
917 qp_attr.qp_state = IB_QPS_INIT;
918 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
919 if (ret)
920 return ret;
921
922 return ib_modify_qp(qp, &qp_attr, qp_attr_mask);
923 }
924
925 int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd,
926 struct ib_qp_init_attr *qp_init_attr)
927 {
928 struct rdma_id_private *id_priv;
929 struct ib_qp *qp;
930 int ret;
931
932 id_priv = container_of(id, struct rdma_id_private, id);
933 if (id->device != pd->device) {
934 ret = -EINVAL;
935 goto out_err;
936 }
937
938 qp_init_attr->port_num = id->port_num;
939 qp = ib_create_qp(pd, qp_init_attr);
940 if (IS_ERR(qp)) {
941 ret = PTR_ERR(qp);
942 goto out_err;
943 }
944
945 if (id->qp_type == IB_QPT_UD)
946 ret = cma_init_ud_qp(id_priv, qp);
947 else
948 ret = cma_init_conn_qp(id_priv, qp);
949 if (ret)
950 goto out_destroy;
951
952 id->qp = qp;
953 id_priv->qp_num = qp->qp_num;
954 id_priv->srq = (qp->srq != NULL);
955 trace_cm_qp_create(id_priv, pd, qp_init_attr, 0);
956 return 0;
957 out_destroy:
958 ib_destroy_qp(qp);
959 out_err:
960 trace_cm_qp_create(id_priv, pd, qp_init_attr, ret);
961 return ret;
962 }
963 EXPORT_SYMBOL(rdma_create_qp);
964
965 void rdma_destroy_qp(struct rdma_cm_id *id)
966 {
967 struct rdma_id_private *id_priv;
968
969 id_priv = container_of(id, struct rdma_id_private, id);
970 trace_cm_qp_destroy(id_priv);
971 mutex_lock(&id_priv->qp_mutex);
972 ib_destroy_qp(id_priv->id.qp);
973 id_priv->id.qp = NULL;
974 mutex_unlock(&id_priv->qp_mutex);
975 }
976 EXPORT_SYMBOL(rdma_destroy_qp);
977
978 static int cma_modify_qp_rtr(struct rdma_id_private *id_priv,
979 struct rdma_conn_param *conn_param)
980 {
981 struct ib_qp_attr qp_attr;
982 int qp_attr_mask, ret;
983
984 mutex_lock(&id_priv->qp_mutex);
985 if (!id_priv->id.qp) {
986 ret = 0;
987 goto out;
988 }
989
990 /* Need to update QP attributes from default values. */
991 qp_attr.qp_state = IB_QPS_INIT;
992 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
993 if (ret)
994 goto out;
995
996 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
997 if (ret)
998 goto out;
999
1000 qp_attr.qp_state = IB_QPS_RTR;
1001 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
1002 if (ret)
1003 goto out;
1004
1005 BUG_ON(id_priv->cma_dev->device != id_priv->id.device);
1006
1007 if (conn_param)
1008 qp_attr.max_dest_rd_atomic = conn_param->responder_resources;
1009 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
1010 out:
1011 mutex_unlock(&id_priv->qp_mutex);
1012 return ret;
1013 }
1014
1015 static int cma_modify_qp_rts(struct rdma_id_private *id_priv,
1016 struct rdma_conn_param *conn_param)
1017 {
1018 struct ib_qp_attr qp_attr;
1019 int qp_attr_mask, ret;
1020
1021 mutex_lock(&id_priv->qp_mutex);
1022 if (!id_priv->id.qp) {
1023 ret = 0;
1024 goto out;
1025 }
1026
1027 qp_attr.qp_state = IB_QPS_RTS;
1028 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
1029 if (ret)
1030 goto out;
1031
1032 if (conn_param)
1033 qp_attr.max_rd_atomic = conn_param->initiator_depth;
1034 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
1035 out:
1036 mutex_unlock(&id_priv->qp_mutex);
1037 return ret;
1038 }
1039
1040 static int cma_modify_qp_err(struct rdma_id_private *id_priv)
1041 {
1042 struct ib_qp_attr qp_attr;
1043 int ret;
1044
1045 mutex_lock(&id_priv->qp_mutex);
1046 if (!id_priv->id.qp) {
1047 ret = 0;
1048 goto out;
1049 }
1050
1051 qp_attr.qp_state = IB_QPS_ERR;
1052 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, IB_QP_STATE);
1053 out:
1054 mutex_unlock(&id_priv->qp_mutex);
1055 return ret;
1056 }
1057
1058 static int cma_ib_init_qp_attr(struct rdma_id_private *id_priv,
1059 struct ib_qp_attr *qp_attr, int *qp_attr_mask)
1060 {
1061 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
1062 int ret;
1063 u16 pkey;
1064
1065 if (rdma_cap_eth_ah(id_priv->id.device, id_priv->id.port_num))
1066 pkey = 0xffff;
1067 else
1068 pkey = ib_addr_get_pkey(dev_addr);
1069
1070 ret = ib_find_cached_pkey(id_priv->id.device, id_priv->id.port_num,
1071 pkey, &qp_attr->pkey_index);
1072 if (ret)
1073 return ret;
1074
1075 qp_attr->port_num = id_priv->id.port_num;
1076 *qp_attr_mask = IB_QP_STATE | IB_QP_PKEY_INDEX | IB_QP_PORT;
1077
1078 if (id_priv->id.qp_type == IB_QPT_UD) {
1079 ret = cma_set_qkey(id_priv, 0);
1080 if (ret)
1081 return ret;
1082
1083 qp_attr->qkey = id_priv->qkey;
1084 *qp_attr_mask |= IB_QP_QKEY;
1085 } else {
1086 qp_attr->qp_access_flags = 0;
1087 *qp_attr_mask |= IB_QP_ACCESS_FLAGS;
1088 }
1089 return 0;
1090 }
1091
1092 int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
1093 int *qp_attr_mask)
1094 {
1095 struct rdma_id_private *id_priv;
1096 int ret = 0;
1097
1098 id_priv = container_of(id, struct rdma_id_private, id);
1099 if (rdma_cap_ib_cm(id->device, id->port_num)) {
1100 if (!id_priv->cm_id.ib || (id_priv->id.qp_type == IB_QPT_UD))
1101 ret = cma_ib_init_qp_attr(id_priv, qp_attr, qp_attr_mask);
1102 else
1103 ret = ib_cm_init_qp_attr(id_priv->cm_id.ib, qp_attr,
1104 qp_attr_mask);
1105
1106 if (qp_attr->qp_state == IB_QPS_RTR)
1107 qp_attr->rq_psn = id_priv->seq_num;
1108 } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
1109 if (!id_priv->cm_id.iw) {
1110 qp_attr->qp_access_flags = 0;
1111 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS;
1112 } else
1113 ret = iw_cm_init_qp_attr(id_priv->cm_id.iw, qp_attr,
1114 qp_attr_mask);
1115 qp_attr->port_num = id_priv->id.port_num;
1116 *qp_attr_mask |= IB_QP_PORT;
1117 } else
1118 ret = -ENOSYS;
1119
1120 if ((*qp_attr_mask & IB_QP_TIMEOUT) && id_priv->timeout_set)
1121 qp_attr->timeout = id_priv->timeout;
1122
1123 return ret;
1124 }
1125 EXPORT_SYMBOL(rdma_init_qp_attr);
1126
1127 static inline bool cma_zero_addr(const struct sockaddr *addr)
1128 {
1129 switch (addr->sa_family) {
1130 case AF_INET:
1131 return ipv4_is_zeronet(((struct sockaddr_in *)addr)->sin_addr.s_addr);
1132 case AF_INET6:
1133 return ipv6_addr_any(&((struct sockaddr_in6 *)addr)->sin6_addr);
1134 case AF_IB:
1135 return ib_addr_any(&((struct sockaddr_ib *)addr)->sib_addr);
1136 default:
1137 return false;
1138 }
1139 }
1140
1141 static inline bool cma_loopback_addr(const struct sockaddr *addr)
1142 {
1143 switch (addr->sa_family) {
1144 case AF_INET:
1145 return ipv4_is_loopback(
1146 ((struct sockaddr_in *)addr)->sin_addr.s_addr);
1147 case AF_INET6:
1148 return ipv6_addr_loopback(
1149 &((struct sockaddr_in6 *)addr)->sin6_addr);
1150 case AF_IB:
1151 return ib_addr_loopback(
1152 &((struct sockaddr_ib *)addr)->sib_addr);
1153 default:
1154 return false;
1155 }
1156 }
1157
1158 static inline bool cma_any_addr(const struct sockaddr *addr)
1159 {
1160 return cma_zero_addr(addr) || cma_loopback_addr(addr);
1161 }
1162
1163 static int cma_addr_cmp(const struct sockaddr *src, const struct sockaddr *dst)
1164 {
1165 if (src->sa_family != dst->sa_family)
1166 return -1;
1167
1168 switch (src->sa_family) {
1169 case AF_INET:
1170 return ((struct sockaddr_in *)src)->sin_addr.s_addr !=
1171 ((struct sockaddr_in *)dst)->sin_addr.s_addr;
1172 case AF_INET6: {
1173 struct sockaddr_in6 *src_addr6 = (struct sockaddr_in6 *)src;
1174 struct sockaddr_in6 *dst_addr6 = (struct sockaddr_in6 *)dst;
1175 bool link_local;
1176
1177 if (ipv6_addr_cmp(&src_addr6->sin6_addr,
1178 &dst_addr6->sin6_addr))
1179 return 1;
1180 link_local = ipv6_addr_type(&dst_addr6->sin6_addr) &
1181 IPV6_ADDR_LINKLOCAL;
1182 /* Link local must match their scope_ids */
1183 return link_local ? (src_addr6->sin6_scope_id !=
1184 dst_addr6->sin6_scope_id) :
1185 0;
1186 }
1187
1188 default:
1189 return ib_addr_cmp(&((struct sockaddr_ib *) src)->sib_addr,
1190 &((struct sockaddr_ib *) dst)->sib_addr);
1191 }
1192 }
1193
1194 static __be16 cma_port(const struct sockaddr *addr)
1195 {
1196 struct sockaddr_ib *sib;
1197
1198 switch (addr->sa_family) {
1199 case AF_INET:
1200 return ((struct sockaddr_in *) addr)->sin_port;
1201 case AF_INET6:
1202 return ((struct sockaddr_in6 *) addr)->sin6_port;
1203 case AF_IB:
1204 sib = (struct sockaddr_ib *) addr;
1205 return htons((u16) (be64_to_cpu(sib->sib_sid) &
1206 be64_to_cpu(sib->sib_sid_mask)));
1207 default:
1208 return 0;
1209 }
1210 }
1211
1212 static inline int cma_any_port(const struct sockaddr *addr)
1213 {
1214 return !cma_port(addr);
1215 }
1216
1217 static void cma_save_ib_info(struct sockaddr *src_addr,
1218 struct sockaddr *dst_addr,
1219 const struct rdma_cm_id *listen_id,
1220 const struct sa_path_rec *path)
1221 {
1222 struct sockaddr_ib *listen_ib, *ib;
1223
1224 listen_ib = (struct sockaddr_ib *) &listen_id->route.addr.src_addr;
1225 if (src_addr) {
1226 ib = (struct sockaddr_ib *)src_addr;
1227 ib->sib_family = AF_IB;
1228 if (path) {
1229 ib->sib_pkey = path->pkey;
1230 ib->sib_flowinfo = path->flow_label;
1231 memcpy(&ib->sib_addr, &path->sgid, 16);
1232 ib->sib_sid = path->service_id;
1233 ib->sib_scope_id = 0;
1234 } else {
1235 ib->sib_pkey = listen_ib->sib_pkey;
1236 ib->sib_flowinfo = listen_ib->sib_flowinfo;
1237 ib->sib_addr = listen_ib->sib_addr;
1238 ib->sib_sid = listen_ib->sib_sid;
1239 ib->sib_scope_id = listen_ib->sib_scope_id;
1240 }
1241 ib->sib_sid_mask = cpu_to_be64(0xffffffffffffffffULL);
1242 }
1243 if (dst_addr) {
1244 ib = (struct sockaddr_ib *)dst_addr;
1245 ib->sib_family = AF_IB;
1246 if (path) {
1247 ib->sib_pkey = path->pkey;
1248 ib->sib_flowinfo = path->flow_label;
1249 memcpy(&ib->sib_addr, &path->dgid, 16);
1250 }
1251 }
1252 }
1253
1254 static void cma_save_ip4_info(struct sockaddr_in *src_addr,
1255 struct sockaddr_in *dst_addr,
1256 struct cma_hdr *hdr,
1257 __be16 local_port)
1258 {
1259 if (src_addr) {
1260 *src_addr = (struct sockaddr_in) {
1261 .sin_family = AF_INET,
1262 .sin_addr.s_addr = hdr->dst_addr.ip4.addr,
1263 .sin_port = local_port,
1264 };
1265 }
1266
1267 if (dst_addr) {
1268 *dst_addr = (struct sockaddr_in) {
1269 .sin_family = AF_INET,
1270 .sin_addr.s_addr = hdr->src_addr.ip4.addr,
1271 .sin_port = hdr->port,
1272 };
1273 }
1274 }
1275
1276 static void cma_save_ip6_info(struct sockaddr_in6 *src_addr,
1277 struct sockaddr_in6 *dst_addr,
1278 struct cma_hdr *hdr,
1279 __be16 local_port)
1280 {
1281 if (src_addr) {
1282 *src_addr = (struct sockaddr_in6) {
1283 .sin6_family = AF_INET6,
1284 .sin6_addr = hdr->dst_addr.ip6,
1285 .sin6_port = local_port,
1286 };
1287 }
1288
1289 if (dst_addr) {
1290 *dst_addr = (struct sockaddr_in6) {
1291 .sin6_family = AF_INET6,
1292 .sin6_addr = hdr->src_addr.ip6,
1293 .sin6_port = hdr->port,
1294 };
1295 }
1296 }
1297
1298 static u16 cma_port_from_service_id(__be64 service_id)
1299 {
1300 return (u16)be64_to_cpu(service_id);
1301 }
1302
1303 static int cma_save_ip_info(struct sockaddr *src_addr,
1304 struct sockaddr *dst_addr,
1305 const struct ib_cm_event *ib_event,
1306 __be64 service_id)
1307 {
1308 struct cma_hdr *hdr;
1309 __be16 port;
1310
1311 hdr = ib_event->private_data;
1312 if (hdr->cma_version != CMA_VERSION)
1313 return -EINVAL;
1314
1315 port = htons(cma_port_from_service_id(service_id));
1316
1317 switch (cma_get_ip_ver(hdr)) {
1318 case 4:
1319 cma_save_ip4_info((struct sockaddr_in *)src_addr,
1320 (struct sockaddr_in *)dst_addr, hdr, port);
1321 break;
1322 case 6:
1323 cma_save_ip6_info((struct sockaddr_in6 *)src_addr,
1324 (struct sockaddr_in6 *)dst_addr, hdr, port);
1325 break;
1326 default:
1327 return -EAFNOSUPPORT;
1328 }
1329
1330 return 0;
1331 }
1332
1333 static int cma_save_net_info(struct sockaddr *src_addr,
1334 struct sockaddr *dst_addr,
1335 const struct rdma_cm_id *listen_id,
1336 const struct ib_cm_event *ib_event,
1337 sa_family_t sa_family, __be64 service_id)
1338 {
1339 if (sa_family == AF_IB) {
1340 if (ib_event->event == IB_CM_REQ_RECEIVED)
1341 cma_save_ib_info(src_addr, dst_addr, listen_id,
1342 ib_event->param.req_rcvd.primary_path);
1343 else if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED)
1344 cma_save_ib_info(src_addr, dst_addr, listen_id, NULL);
1345 return 0;
1346 }
1347
1348 return cma_save_ip_info(src_addr, dst_addr, ib_event, service_id);
1349 }
1350
1351 static int cma_save_req_info(const struct ib_cm_event *ib_event,
1352 struct cma_req_info *req)
1353 {
1354 const struct ib_cm_req_event_param *req_param =
1355 &ib_event->param.req_rcvd;
1356 const struct ib_cm_sidr_req_event_param *sidr_param =
1357 &ib_event->param.sidr_req_rcvd;
1358
1359 switch (ib_event->event) {
1360 case IB_CM_REQ_RECEIVED:
1361 req->device = req_param->listen_id->device;
1362 req->port = req_param->port;
1363 memcpy(&req->local_gid, &req_param->primary_path->sgid,
1364 sizeof(req->local_gid));
1365 req->has_gid = true;
1366 req->service_id = req_param->primary_path->service_id;
1367 req->pkey = be16_to_cpu(req_param->primary_path->pkey);
1368 if (req->pkey != req_param->bth_pkey)
1369 pr_warn_ratelimited("RDMA CMA: got different BTH P_Key (0x%x) and primary path P_Key (0x%x)\n"
1370 "RDMA CMA: in the future this may cause the request to be dropped\n",
1371 req_param->bth_pkey, req->pkey);
1372 break;
1373 case IB_CM_SIDR_REQ_RECEIVED:
1374 req->device = sidr_param->listen_id->device;
1375 req->port = sidr_param->port;
1376 req->has_gid = false;
1377 req->service_id = sidr_param->service_id;
1378 req->pkey = sidr_param->pkey;
1379 if (req->pkey != sidr_param->bth_pkey)
1380 pr_warn_ratelimited("RDMA CMA: got different BTH P_Key (0x%x) and SIDR request payload P_Key (0x%x)\n"
1381 "RDMA CMA: in the future this may cause the request to be dropped\n",
1382 sidr_param->bth_pkey, req->pkey);
1383 break;
1384 default:
1385 return -EINVAL;
1386 }
1387
1388 return 0;
1389 }
1390
1391 static bool validate_ipv4_net_dev(struct net_device *net_dev,
1392 const struct sockaddr_in *dst_addr,
1393 const struct sockaddr_in *src_addr)
1394 {
1395 __be32 daddr = dst_addr->sin_addr.s_addr,
1396 saddr = src_addr->sin_addr.s_addr;
1397 struct fib_result res;
1398 struct flowi4 fl4;
1399 int err;
1400 bool ret;
1401
1402 if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) ||
1403 ipv4_is_lbcast(daddr) || ipv4_is_zeronet(saddr) ||
1404 ipv4_is_zeronet(daddr) || ipv4_is_loopback(daddr) ||
1405 ipv4_is_loopback(saddr))
1406 return false;
1407
1408 memset(&fl4, 0, sizeof(fl4));
1409 fl4.flowi4_iif = net_dev->ifindex;
1410 fl4.daddr = daddr;
1411 fl4.saddr = saddr;
1412
1413 rcu_read_lock();
1414 err = fib_lookup(dev_net(net_dev), &fl4, &res, 0);
1415 ret = err == 0 && FIB_RES_DEV(res) == net_dev;
1416 rcu_read_unlock();
1417
1418 return ret;
1419 }
1420
1421 static bool validate_ipv6_net_dev(struct net_device *net_dev,
1422 const struct sockaddr_in6 *dst_addr,
1423 const struct sockaddr_in6 *src_addr)
1424 {
1425 #if IS_ENABLED(CONFIG_IPV6)
1426 const int strict = ipv6_addr_type(&dst_addr->sin6_addr) &
1427 IPV6_ADDR_LINKLOCAL;
1428 struct rt6_info *rt = rt6_lookup(dev_net(net_dev), &dst_addr->sin6_addr,
1429 &src_addr->sin6_addr, net_dev->ifindex,
1430 NULL, strict);
1431 bool ret;
1432
1433 if (!rt)
1434 return false;
1435
1436 ret = rt->rt6i_idev->dev == net_dev;
1437 ip6_rt_put(rt);
1438
1439 return ret;
1440 #else
1441 return false;
1442 #endif
1443 }
1444
1445 static bool validate_net_dev(struct net_device *net_dev,
1446 const struct sockaddr *daddr,
1447 const struct sockaddr *saddr)
1448 {
1449 const struct sockaddr_in *daddr4 = (const struct sockaddr_in *)daddr;
1450 const struct sockaddr_in *saddr4 = (const struct sockaddr_in *)saddr;
1451 const struct sockaddr_in6 *daddr6 = (const struct sockaddr_in6 *)daddr;
1452 const struct sockaddr_in6 *saddr6 = (const struct sockaddr_in6 *)saddr;
1453
1454 switch (daddr->sa_family) {
1455 case AF_INET:
1456 return saddr->sa_family == AF_INET &&
1457 validate_ipv4_net_dev(net_dev, daddr4, saddr4);
1458
1459 case AF_INET6:
1460 return saddr->sa_family == AF_INET6 &&
1461 validate_ipv6_net_dev(net_dev, daddr6, saddr6);
1462
1463 default:
1464 return false;
1465 }
1466 }
1467
1468 static struct net_device *
1469 roce_get_net_dev_by_cm_event(const struct ib_cm_event *ib_event)
1470 {
1471 const struct ib_gid_attr *sgid_attr = NULL;
1472 struct net_device *ndev;
1473
1474 if (ib_event->event == IB_CM_REQ_RECEIVED)
1475 sgid_attr = ib_event->param.req_rcvd.ppath_sgid_attr;
1476 else if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED)
1477 sgid_attr = ib_event->param.sidr_req_rcvd.sgid_attr;
1478
1479 if (!sgid_attr)
1480 return NULL;
1481
1482 rcu_read_lock();
1483 ndev = rdma_read_gid_attr_ndev_rcu(sgid_attr);
1484 if (IS_ERR(ndev))
1485 ndev = NULL;
1486 else
1487 dev_hold(ndev);
1488 rcu_read_unlock();
1489 return ndev;
1490 }
1491
1492 static struct net_device *cma_get_net_dev(const struct ib_cm_event *ib_event,
1493 struct cma_req_info *req)
1494 {
1495 struct sockaddr *listen_addr =
1496 (struct sockaddr *)&req->listen_addr_storage;
1497 struct sockaddr *src_addr = (struct sockaddr *)&req->src_addr_storage;
1498 struct net_device *net_dev;
1499 const union ib_gid *gid = req->has_gid ? &req->local_gid : NULL;
1500 int err;
1501
1502 err = cma_save_ip_info(listen_addr, src_addr, ib_event,
1503 req->service_id);
1504 if (err)
1505 return ERR_PTR(err);
1506
1507 if (rdma_protocol_roce(req->device, req->port))
1508 net_dev = roce_get_net_dev_by_cm_event(ib_event);
1509 else
1510 net_dev = ib_get_net_dev_by_params(req->device, req->port,
1511 req->pkey,
1512 gid, listen_addr);
1513 if (!net_dev)
1514 return ERR_PTR(-ENODEV);
1515
1516 return net_dev;
1517 }
1518
1519 static enum rdma_ucm_port_space rdma_ps_from_service_id(__be64 service_id)
1520 {
1521 return (be64_to_cpu(service_id) >> 16) & 0xffff;
1522 }
1523
1524 static bool cma_match_private_data(struct rdma_id_private *id_priv,
1525 const struct cma_hdr *hdr)
1526 {
1527 struct sockaddr *addr = cma_src_addr(id_priv);
1528 __be32 ip4_addr;
1529 struct in6_addr ip6_addr;
1530
1531 if (cma_any_addr(addr) && !id_priv->afonly)
1532 return true;
1533
1534 switch (addr->sa_family) {
1535 case AF_INET:
1536 ip4_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
1537 if (cma_get_ip_ver(hdr) != 4)
1538 return false;
1539 if (!cma_any_addr(addr) &&
1540 hdr->dst_addr.ip4.addr != ip4_addr)
1541 return false;
1542 break;
1543 case AF_INET6:
1544 ip6_addr = ((struct sockaddr_in6 *)addr)->sin6_addr;
1545 if (cma_get_ip_ver(hdr) != 6)
1546 return false;
1547 if (!cma_any_addr(addr) &&
1548 memcmp(&hdr->dst_addr.ip6, &ip6_addr, sizeof(ip6_addr)))
1549 return false;
1550 break;
1551 case AF_IB:
1552 return true;
1553 default:
1554 return false;
1555 }
1556
1557 return true;
1558 }
1559
1560 static bool cma_protocol_roce(const struct rdma_cm_id *id)
1561 {
1562 struct ib_device *device = id->device;
1563 const int port_num = id->port_num ?: rdma_start_port(device);
1564
1565 return rdma_protocol_roce(device, port_num);
1566 }
1567
1568 static bool cma_is_req_ipv6_ll(const struct cma_req_info *req)
1569 {
1570 const struct sockaddr *daddr =
1571 (const struct sockaddr *)&req->listen_addr_storage;
1572 const struct sockaddr_in6 *daddr6 = (const struct sockaddr_in6 *)daddr;
1573
1574 /* Returns true if the req is for IPv6 link local */
1575 return (daddr->sa_family == AF_INET6 &&
1576 (ipv6_addr_type(&daddr6->sin6_addr) & IPV6_ADDR_LINKLOCAL));
1577 }
1578
1579 static bool cma_match_net_dev(const struct rdma_cm_id *id,
1580 const struct net_device *net_dev,
1581 const struct cma_req_info *req)
1582 {
1583 const struct rdma_addr *addr = &id->route.addr;
1584
1585 if (!net_dev)
1586 /* This request is an AF_IB request */
1587 return (!id->port_num || id->port_num == req->port) &&
1588 (addr->src_addr.ss_family == AF_IB);
1589
1590 /*
1591 * If the request is not for IPv6 link local, allow matching
1592 * request to any netdevice of the one or multiport rdma device.
1593 */
1594 if (!cma_is_req_ipv6_ll(req))
1595 return true;
1596 /*
1597 * Net namespaces must match, and if the listner is listening
1598 * on a specific netdevice than netdevice must match as well.
1599 */
1600 if (net_eq(dev_net(net_dev), addr->dev_addr.net) &&
1601 (!!addr->dev_addr.bound_dev_if ==
1602 (addr->dev_addr.bound_dev_if == net_dev->ifindex)))
1603 return true;
1604 else
1605 return false;
1606 }
1607
1608 static struct rdma_id_private *cma_find_listener(
1609 const struct rdma_bind_list *bind_list,
1610 const struct ib_cm_id *cm_id,
1611 const struct ib_cm_event *ib_event,
1612 const struct cma_req_info *req,
1613 const struct net_device *net_dev)
1614 {
1615 struct rdma_id_private *id_priv, *id_priv_dev;
1616
1617 if (!bind_list)
1618 return ERR_PTR(-EINVAL);
1619
1620 hlist_for_each_entry(id_priv, &bind_list->owners, node) {
1621 if (cma_match_private_data(id_priv, ib_event->private_data)) {
1622 if (id_priv->id.device == cm_id->device &&
1623 cma_match_net_dev(&id_priv->id, net_dev, req))
1624 return id_priv;
1625 list_for_each_entry(id_priv_dev,
1626 &id_priv->listen_list,
1627 listen_list) {
1628 if (id_priv_dev->id.device == cm_id->device &&
1629 cma_match_net_dev(&id_priv_dev->id,
1630 net_dev, req))
1631 return id_priv_dev;
1632 }
1633 }
1634 }
1635
1636 return ERR_PTR(-EINVAL);
1637 }
1638
1639 static struct rdma_id_private *
1640 cma_ib_id_from_event(struct ib_cm_id *cm_id,
1641 const struct ib_cm_event *ib_event,
1642 struct cma_req_info *req,
1643 struct net_device **net_dev)
1644 {
1645 struct rdma_bind_list *bind_list;
1646 struct rdma_id_private *id_priv;
1647 int err;
1648
1649 err = cma_save_req_info(ib_event, req);
1650 if (err)
1651 return ERR_PTR(err);
1652
1653 *net_dev = cma_get_net_dev(ib_event, req);
1654 if (IS_ERR(*net_dev)) {
1655 if (PTR_ERR(*net_dev) == -EAFNOSUPPORT) {
1656 /* Assuming the protocol is AF_IB */
1657 *net_dev = NULL;
1658 } else {
1659 return ERR_CAST(*net_dev);
1660 }
1661 }
1662
1663 /*
1664 * Net namespace might be getting deleted while route lookup,
1665 * cm_id lookup is in progress. Therefore, perform netdevice
1666 * validation, cm_id lookup under rcu lock.
1667 * RCU lock along with netdevice state check, synchronizes with
1668 * netdevice migrating to different net namespace and also avoids
1669 * case where net namespace doesn't get deleted while lookup is in
1670 * progress.
1671 * If the device state is not IFF_UP, its properties such as ifindex
1672 * and nd_net cannot be trusted to remain valid without rcu lock.
1673 * net/core/dev.c change_net_namespace() ensures to synchronize with
1674 * ongoing operations on net device after device is closed using
1675 * synchronize_net().
1676 */
1677 rcu_read_lock();
1678 if (*net_dev) {
1679 /*
1680 * If netdevice is down, it is likely that it is administratively
1681 * down or it might be migrating to different namespace.
1682 * In that case avoid further processing, as the net namespace
1683 * or ifindex may change.
1684 */
1685 if (((*net_dev)->flags & IFF_UP) == 0) {
1686 id_priv = ERR_PTR(-EHOSTUNREACH);
1687 goto err;
1688 }
1689
1690 if (!validate_net_dev(*net_dev,
1691 (struct sockaddr *)&req->listen_addr_storage,
1692 (struct sockaddr *)&req->src_addr_storage)) {
1693 id_priv = ERR_PTR(-EHOSTUNREACH);
1694 goto err;
1695 }
1696 }
1697
1698 bind_list = cma_ps_find(*net_dev ? dev_net(*net_dev) : &init_net,
1699 rdma_ps_from_service_id(req->service_id),
1700 cma_port_from_service_id(req->service_id));
1701 id_priv = cma_find_listener(bind_list, cm_id, ib_event, req, *net_dev);
1702 err:
1703 rcu_read_unlock();
1704 if (IS_ERR(id_priv) && *net_dev) {
1705 dev_put(*net_dev);
1706 *net_dev = NULL;
1707 }
1708 return id_priv;
1709 }
1710
1711 static inline u8 cma_user_data_offset(struct rdma_id_private *id_priv)
1712 {
1713 return cma_family(id_priv) == AF_IB ? 0 : sizeof(struct cma_hdr);
1714 }
1715
1716 static void cma_cancel_route(struct rdma_id_private *id_priv)
1717 {
1718 if (rdma_cap_ib_sa(id_priv->id.device, id_priv->id.port_num)) {
1719 if (id_priv->query)
1720 ib_sa_cancel_query(id_priv->query_id, id_priv->query);
1721 }
1722 }
1723
1724 static void cma_cancel_listens(struct rdma_id_private *id_priv)
1725 {
1726 struct rdma_id_private *dev_id_priv;
1727
1728 /*
1729 * Remove from listen_any_list to prevent added devices from spawning
1730 * additional listen requests.
1731 */
1732 mutex_lock(&lock);
1733 list_del(&id_priv->list);
1734
1735 while (!list_empty(&id_priv->listen_list)) {
1736 dev_id_priv = list_entry(id_priv->listen_list.next,
1737 struct rdma_id_private, listen_list);
1738 /* sync with device removal to avoid duplicate destruction */
1739 list_del_init(&dev_id_priv->list);
1740 list_del(&dev_id_priv->listen_list);
1741 mutex_unlock(&lock);
1742
1743 rdma_destroy_id(&dev_id_priv->id);
1744 mutex_lock(&lock);
1745 }
1746 mutex_unlock(&lock);
1747 }
1748
1749 static void cma_cancel_operation(struct rdma_id_private *id_priv,
1750 enum rdma_cm_state state)
1751 {
1752 switch (state) {
1753 case RDMA_CM_ADDR_QUERY:
1754 rdma_addr_cancel(&id_priv->id.route.addr.dev_addr);
1755 break;
1756 case RDMA_CM_ROUTE_QUERY:
1757 cma_cancel_route(id_priv);
1758 break;
1759 case RDMA_CM_LISTEN:
1760 if (cma_any_addr(cma_src_addr(id_priv)) && !id_priv->cma_dev)
1761 cma_cancel_listens(id_priv);
1762 break;
1763 default:
1764 break;
1765 }
1766 }
1767
1768 static void cma_release_port(struct rdma_id_private *id_priv)
1769 {
1770 struct rdma_bind_list *bind_list = id_priv->bind_list;
1771 struct net *net = id_priv->id.route.addr.dev_addr.net;
1772
1773 if (!bind_list)
1774 return;
1775
1776 mutex_lock(&lock);
1777 hlist_del(&id_priv->node);
1778 if (hlist_empty(&bind_list->owners)) {
1779 cma_ps_remove(net, bind_list->ps, bind_list->port);
1780 kfree(bind_list);
1781 }
1782 mutex_unlock(&lock);
1783 }
1784
1785 static void cma_leave_roce_mc_group(struct rdma_id_private *id_priv,
1786 struct cma_multicast *mc)
1787 {
1788 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
1789 struct net_device *ndev = NULL;
1790
1791 if (dev_addr->bound_dev_if)
1792 ndev = dev_get_by_index(dev_addr->net, dev_addr->bound_dev_if);
1793 if (ndev) {
1794 cma_igmp_send(ndev, &mc->multicast.ib->rec.mgid, false);
1795 dev_put(ndev);
1796 }
1797 kref_put(&mc->mcref, release_mc);
1798 }
1799
1800 static void cma_leave_mc_groups(struct rdma_id_private *id_priv)
1801 {
1802 struct cma_multicast *mc;
1803
1804 while (!list_empty(&id_priv->mc_list)) {
1805 mc = container_of(id_priv->mc_list.next,
1806 struct cma_multicast, list);
1807 list_del(&mc->list);
1808 if (rdma_cap_ib_mcast(id_priv->cma_dev->device,
1809 id_priv->id.port_num)) {
1810 ib_sa_free_multicast(mc->multicast.ib);
1811 kfree(mc);
1812 } else {
1813 cma_leave_roce_mc_group(id_priv, mc);
1814 }
1815 }
1816 }
1817
1818 void rdma_destroy_id(struct rdma_cm_id *id)
1819 {
1820 struct rdma_id_private *id_priv;
1821 enum rdma_cm_state state;
1822
1823 id_priv = container_of(id, struct rdma_id_private, id);
1824 trace_cm_id_destroy(id_priv);
1825 state = cma_exch(id_priv, RDMA_CM_DESTROYING);
1826 cma_cancel_operation(id_priv, state);
1827
1828 /*
1829 * Wait for any active callback to finish. New callbacks will find
1830 * the id_priv state set to destroying and abort.
1831 */
1832 mutex_lock(&id_priv->handler_mutex);
1833 mutex_unlock(&id_priv->handler_mutex);
1834
1835 rdma_restrack_del(&id_priv->res);
1836 if (id_priv->cma_dev) {
1837 if (rdma_cap_ib_cm(id_priv->id.device, 1)) {
1838 if (id_priv->cm_id.ib)
1839 ib_destroy_cm_id(id_priv->cm_id.ib);
1840 } else if (rdma_cap_iw_cm(id_priv->id.device, 1)) {
1841 if (id_priv->cm_id.iw)
1842 iw_destroy_cm_id(id_priv->cm_id.iw);
1843 }
1844 cma_leave_mc_groups(id_priv);
1845 cma_release_dev(id_priv);
1846 }
1847
1848 cma_release_port(id_priv);
1849 cma_deref_id(id_priv);
1850 wait_for_completion(&id_priv->comp);
1851
1852 if (id_priv->internal_id)
1853 cma_deref_id(id_priv->id.context);
1854
1855 kfree(id_priv->id.route.path_rec);
1856
1857 if (id_priv->id.route.addr.dev_addr.sgid_attr)
1858 rdma_put_gid_attr(id_priv->id.route.addr.dev_addr.sgid_attr);
1859
1860 put_net(id_priv->id.route.addr.dev_addr.net);
1861 kfree(id_priv);
1862 }
1863 EXPORT_SYMBOL(rdma_destroy_id);
1864
1865 static int cma_rep_recv(struct rdma_id_private *id_priv)
1866 {
1867 int ret;
1868
1869 ret = cma_modify_qp_rtr(id_priv, NULL);
1870 if (ret)
1871 goto reject;
1872
1873 ret = cma_modify_qp_rts(id_priv, NULL);
1874 if (ret)
1875 goto reject;
1876
1877 trace_cm_send_rtu(id_priv);
1878 ret = ib_send_cm_rtu(id_priv->cm_id.ib, NULL, 0);
1879 if (ret)
1880 goto reject;
1881
1882 return 0;
1883 reject:
1884 pr_debug_ratelimited("RDMA CM: CONNECT_ERROR: failed to handle reply. status %d\n", ret);
1885 cma_modify_qp_err(id_priv);
1886 trace_cm_send_rej(id_priv);
1887 ib_send_cm_rej(id_priv->cm_id.ib, IB_CM_REJ_CONSUMER_DEFINED,
1888 NULL, 0, NULL, 0);
1889 return ret;
1890 }
1891
1892 static void cma_set_rep_event_data(struct rdma_cm_event *event,
1893 const struct ib_cm_rep_event_param *rep_data,
1894 void *private_data)
1895 {
1896 event->param.conn.private_data = private_data;
1897 event->param.conn.private_data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
1898 event->param.conn.responder_resources = rep_data->responder_resources;
1899 event->param.conn.initiator_depth = rep_data->initiator_depth;
1900 event->param.conn.flow_control = rep_data->flow_control;
1901 event->param.conn.rnr_retry_count = rep_data->rnr_retry_count;
1902 event->param.conn.srq = rep_data->srq;
1903 event->param.conn.qp_num = rep_data->remote_qpn;
1904 }
1905
1906 static int cma_cm_event_handler(struct rdma_id_private *id_priv,
1907 struct rdma_cm_event *event)
1908 {
1909 int ret;
1910
1911 trace_cm_event_handler(id_priv, event);
1912 ret = id_priv->id.event_handler(&id_priv->id, event);
1913 trace_cm_event_done(id_priv, event, ret);
1914 return ret;
1915 }
1916
1917 static int cma_ib_handler(struct ib_cm_id *cm_id,
1918 const struct ib_cm_event *ib_event)
1919 {
1920 struct rdma_id_private *id_priv = cm_id->context;
1921 struct rdma_cm_event event = {};
1922 int ret = 0;
1923
1924 mutex_lock(&id_priv->handler_mutex);
1925 if ((ib_event->event != IB_CM_TIMEWAIT_EXIT &&
1926 id_priv->state != RDMA_CM_CONNECT) ||
1927 (ib_event->event == IB_CM_TIMEWAIT_EXIT &&
1928 id_priv->state != RDMA_CM_DISCONNECT))
1929 goto out;
1930
1931 switch (ib_event->event) {
1932 case IB_CM_REQ_ERROR:
1933 case IB_CM_REP_ERROR:
1934 event.event = RDMA_CM_EVENT_UNREACHABLE;
1935 event.status = -ETIMEDOUT;
1936 break;
1937 case IB_CM_REP_RECEIVED:
1938 if (cma_comp(id_priv, RDMA_CM_CONNECT) &&
1939 (id_priv->id.qp_type != IB_QPT_UD)) {
1940 trace_cm_send_mra(id_priv);
1941 ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0);
1942 }
1943 if (id_priv->id.qp) {
1944 event.status = cma_rep_recv(id_priv);
1945 event.event = event.status ? RDMA_CM_EVENT_CONNECT_ERROR :
1946 RDMA_CM_EVENT_ESTABLISHED;
1947 } else {
1948 event.event = RDMA_CM_EVENT_CONNECT_RESPONSE;
1949 }
1950 cma_set_rep_event_data(&event, &ib_event->param.rep_rcvd,
1951 ib_event->private_data);
1952 break;
1953 case IB_CM_RTU_RECEIVED:
1954 case IB_CM_USER_ESTABLISHED:
1955 event.event = RDMA_CM_EVENT_ESTABLISHED;
1956 break;
1957 case IB_CM_DREQ_ERROR:
1958 event.status = -ETIMEDOUT; /* fall through */
1959 case IB_CM_DREQ_RECEIVED:
1960 case IB_CM_DREP_RECEIVED:
1961 if (!cma_comp_exch(id_priv, RDMA_CM_CONNECT,
1962 RDMA_CM_DISCONNECT))
1963 goto out;
1964 event.event = RDMA_CM_EVENT_DISCONNECTED;
1965 break;
1966 case IB_CM_TIMEWAIT_EXIT:
1967 event.event = RDMA_CM_EVENT_TIMEWAIT_EXIT;
1968 break;
1969 case IB_CM_MRA_RECEIVED:
1970 /* ignore event */
1971 goto out;
1972 case IB_CM_REJ_RECEIVED:
1973 pr_debug_ratelimited("RDMA CM: REJECTED: %s\n", rdma_reject_msg(&id_priv->id,
1974 ib_event->param.rej_rcvd.reason));
1975 cma_modify_qp_err(id_priv);
1976 event.status = ib_event->param.rej_rcvd.reason;
1977 event.event = RDMA_CM_EVENT_REJECTED;
1978 event.param.conn.private_data = ib_event->private_data;
1979 event.param.conn.private_data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
1980 break;
1981 default:
1982 pr_err("RDMA CMA: unexpected IB CM event: %d\n",
1983 ib_event->event);
1984 goto out;
1985 }
1986
1987 ret = cma_cm_event_handler(id_priv, &event);
1988 if (ret) {
1989 /* Destroy the CM ID by returning a non-zero value. */
1990 id_priv->cm_id.ib = NULL;
1991 cma_exch(id_priv, RDMA_CM_DESTROYING);
1992 mutex_unlock(&id_priv->handler_mutex);
1993 rdma_destroy_id(&id_priv->id);
1994 return ret;
1995 }
1996 out:
1997 mutex_unlock(&id_priv->handler_mutex);
1998 return ret;
1999 }
2000
2001 static struct rdma_id_private *
2002 cma_ib_new_conn_id(const struct rdma_cm_id *listen_id,
2003 const struct ib_cm_event *ib_event,
2004 struct net_device *net_dev)
2005 {
2006 struct rdma_id_private *listen_id_priv;
2007 struct rdma_id_private *id_priv;
2008 struct rdma_cm_id *id;
2009 struct rdma_route *rt;
2010 const sa_family_t ss_family = listen_id->route.addr.src_addr.ss_family;
2011 struct sa_path_rec *path = ib_event->param.req_rcvd.primary_path;
2012 const __be64 service_id =
2013 ib_event->param.req_rcvd.primary_path->service_id;
2014 int ret;
2015
2016 listen_id_priv = container_of(listen_id, struct rdma_id_private, id);
2017 id = __rdma_create_id(listen_id->route.addr.dev_addr.net,
2018 listen_id->event_handler, listen_id->context,
2019 listen_id->ps, ib_event->param.req_rcvd.qp_type,
2020 listen_id_priv->res.kern_name);
2021 if (IS_ERR(id))
2022 return NULL;
2023
2024 id_priv = container_of(id, struct rdma_id_private, id);
2025 if (cma_save_net_info((struct sockaddr *)&id->route.addr.src_addr,
2026 (struct sockaddr *)&id->route.addr.dst_addr,
2027 listen_id, ib_event, ss_family, service_id))
2028 goto err;
2029
2030 rt = &id->route;
2031 rt->num_paths = ib_event->param.req_rcvd.alternate_path ? 2 : 1;
2032 rt->path_rec = kmalloc_array(rt->num_paths, sizeof(*rt->path_rec),
2033 GFP_KERNEL);
2034 if (!rt->path_rec)
2035 goto err;
2036
2037 rt->path_rec[0] = *path;
2038 if (rt->num_paths == 2)
2039 rt->path_rec[1] = *ib_event->param.req_rcvd.alternate_path;
2040
2041 if (net_dev) {
2042 rdma_copy_src_l2_addr(&rt->addr.dev_addr, net_dev);
2043 } else {
2044 if (!cma_protocol_roce(listen_id) &&
2045 cma_any_addr(cma_src_addr(id_priv))) {
2046 rt->addr.dev_addr.dev_type = ARPHRD_INFINIBAND;
2047 rdma_addr_set_sgid(&rt->addr.dev_addr, &rt->path_rec[0].sgid);
2048 ib_addr_set_pkey(&rt->addr.dev_addr, be16_to_cpu(rt->path_rec[0].pkey));
2049 } else if (!cma_any_addr(cma_src_addr(id_priv))) {
2050 ret = cma_translate_addr(cma_src_addr(id_priv), &rt->addr.dev_addr);
2051 if (ret)
2052 goto err;
2053 }
2054 }
2055 rdma_addr_set_dgid(&rt->addr.dev_addr, &rt->path_rec[0].dgid);
2056
2057 id_priv->state = RDMA_CM_CONNECT;
2058 return id_priv;
2059
2060 err:
2061 rdma_destroy_id(id);
2062 return NULL;
2063 }
2064
2065 static struct rdma_id_private *
2066 cma_ib_new_udp_id(const struct rdma_cm_id *listen_id,
2067 const struct ib_cm_event *ib_event,
2068 struct net_device *net_dev)
2069 {
2070 const struct rdma_id_private *listen_id_priv;
2071 struct rdma_id_private *id_priv;
2072 struct rdma_cm_id *id;
2073 const sa_family_t ss_family = listen_id->route.addr.src_addr.ss_family;
2074 struct net *net = listen_id->route.addr.dev_addr.net;
2075 int ret;
2076
2077 listen_id_priv = container_of(listen_id, struct rdma_id_private, id);
2078 id = __rdma_create_id(net, listen_id->event_handler, listen_id->context,
2079 listen_id->ps, IB_QPT_UD,
2080 listen_id_priv->res.kern_name);
2081 if (IS_ERR(id))
2082 return NULL;
2083
2084 id_priv = container_of(id, struct rdma_id_private, id);
2085 if (cma_save_net_info((struct sockaddr *)&id->route.addr.src_addr,
2086 (struct sockaddr *)&id->route.addr.dst_addr,
2087 listen_id, ib_event, ss_family,
2088 ib_event->param.sidr_req_rcvd.service_id))
2089 goto err;
2090
2091 if (net_dev) {
2092 rdma_copy_src_l2_addr(&id->route.addr.dev_addr, net_dev);
2093 } else {
2094 if (!cma_any_addr(cma_src_addr(id_priv))) {
2095 ret = cma_translate_addr(cma_src_addr(id_priv),
2096 &id->route.addr.dev_addr);
2097 if (ret)
2098 goto err;
2099 }
2100 }
2101
2102 id_priv->state = RDMA_CM_CONNECT;
2103 return id_priv;
2104 err:
2105 rdma_destroy_id(id);
2106 return NULL;
2107 }
2108
2109 static void cma_set_req_event_data(struct rdma_cm_event *event,
2110 const struct ib_cm_req_event_param *req_data,
2111 void *private_data, int offset)
2112 {
2113 event->param.conn.private_data = private_data + offset;
2114 event->param.conn.private_data_len = IB_CM_REQ_PRIVATE_DATA_SIZE - offset;
2115 event->param.conn.responder_resources = req_data->responder_resources;
2116 event->param.conn.initiator_depth = req_data->initiator_depth;
2117 event->param.conn.flow_control = req_data->flow_control;
2118 event->param.conn.retry_count = req_data->retry_count;
2119 event->param.conn.rnr_retry_count = req_data->rnr_retry_count;
2120 event->param.conn.srq = req_data->srq;
2121 event->param.conn.qp_num = req_data->remote_qpn;
2122 }
2123
2124 static int cma_ib_check_req_qp_type(const struct rdma_cm_id *id,
2125 const struct ib_cm_event *ib_event)
2126 {
2127 return (((ib_event->event == IB_CM_REQ_RECEIVED) &&
2128 (ib_event->param.req_rcvd.qp_type == id->qp_type)) ||
2129 ((ib_event->event == IB_CM_SIDR_REQ_RECEIVED) &&
2130 (id->qp_type == IB_QPT_UD)) ||
2131 (!id->qp_type));
2132 }
2133
2134 static int cma_ib_req_handler(struct ib_cm_id *cm_id,
2135 const struct ib_cm_event *ib_event)
2136 {
2137 struct rdma_id_private *listen_id, *conn_id = NULL;
2138 struct rdma_cm_event event = {};
2139 struct cma_req_info req = {};
2140 struct net_device *net_dev;
2141 u8 offset;
2142 int ret;
2143
2144 listen_id = cma_ib_id_from_event(cm_id, ib_event, &req, &net_dev);
2145 if (IS_ERR(listen_id))
2146 return PTR_ERR(listen_id);
2147
2148 trace_cm_req_handler(listen_id, ib_event->event);
2149 if (!cma_ib_check_req_qp_type(&listen_id->id, ib_event)) {
2150 ret = -EINVAL;
2151 goto net_dev_put;
2152 }
2153
2154 mutex_lock(&listen_id->handler_mutex);
2155 if (listen_id->state != RDMA_CM_LISTEN) {
2156 ret = -ECONNABORTED;
2157 goto err1;
2158 }
2159
2160 offset = cma_user_data_offset(listen_id);
2161 event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
2162 if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED) {
2163 conn_id = cma_ib_new_udp_id(&listen_id->id, ib_event, net_dev);
2164 event.param.ud.private_data = ib_event->private_data + offset;
2165 event.param.ud.private_data_len =
2166 IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE - offset;
2167 } else {
2168 conn_id = cma_ib_new_conn_id(&listen_id->id, ib_event, net_dev);
2169 cma_set_req_event_data(&event, &ib_event->param.req_rcvd,
2170 ib_event->private_data, offset);
2171 }
2172 if (!conn_id) {
2173 ret = -ENOMEM;
2174 goto err1;
2175 }
2176
2177 mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
2178 ret = cma_ib_acquire_dev(conn_id, listen_id, &req);
2179 if (ret)
2180 goto err2;
2181
2182 conn_id->cm_id.ib = cm_id;
2183 cm_id->context = conn_id;
2184 cm_id->cm_handler = cma_ib_handler;
2185
2186 /*
2187 * Protect against the user destroying conn_id from another thread
2188 * until we're done accessing it.
2189 */
2190 atomic_inc(&conn_id->refcount);
2191 ret = cma_cm_event_handler(conn_id, &event);
2192 if (ret)
2193 goto err3;
2194 /*
2195 * Acquire mutex to prevent user executing rdma_destroy_id()
2196 * while we're accessing the cm_id.
2197 */
2198 mutex_lock(&lock);
2199 if (cma_comp(conn_id, RDMA_CM_CONNECT) &&
2200 (conn_id->id.qp_type != IB_QPT_UD)) {
2201 trace_cm_send_mra(cm_id->context);
2202 ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0);
2203 }
2204 mutex_unlock(&lock);
2205 mutex_unlock(&conn_id->handler_mutex);
2206 mutex_unlock(&listen_id->handler_mutex);
2207 cma_deref_id(conn_id);
2208 if (net_dev)
2209 dev_put(net_dev);
2210 return 0;
2211
2212 err3:
2213 cma_deref_id(conn_id);
2214 /* Destroy the CM ID by returning a non-zero value. */
2215 conn_id->cm_id.ib = NULL;
2216 err2:
2217 cma_exch(conn_id, RDMA_CM_DESTROYING);
2218 mutex_unlock(&conn_id->handler_mutex);
2219 err1:
2220 mutex_unlock(&listen_id->handler_mutex);
2221 if (conn_id)
2222 rdma_destroy_id(&conn_id->id);
2223
2224 net_dev_put:
2225 if (net_dev)
2226 dev_put(net_dev);
2227
2228 return ret;
2229 }
2230
2231 __be64 rdma_get_service_id(struct rdma_cm_id *id, struct sockaddr *addr)
2232 {
2233 if (addr->sa_family == AF_IB)
2234 return ((struct sockaddr_ib *) addr)->sib_sid;
2235
2236 return cpu_to_be64(((u64)id->ps << 16) + be16_to_cpu(cma_port(addr)));
2237 }
2238 EXPORT_SYMBOL(rdma_get_service_id);
2239
2240 void rdma_read_gids(struct rdma_cm_id *cm_id, union ib_gid *sgid,
2241 union ib_gid *dgid)
2242 {
2243 struct rdma_addr *addr = &cm_id->route.addr;
2244
2245 if (!cm_id->device) {
2246 if (sgid)
2247 memset(sgid, 0, sizeof(*sgid));
2248 if (dgid)
2249 memset(dgid, 0, sizeof(*dgid));
2250 return;
2251 }
2252
2253 if (rdma_protocol_roce(cm_id->device, cm_id->port_num)) {
2254 if (sgid)
2255 rdma_ip2gid((struct sockaddr *)&addr->src_addr, sgid);
2256 if (dgid)
2257 rdma_ip2gid((struct sockaddr *)&addr->dst_addr, dgid);
2258 } else {
2259 if (sgid)
2260 rdma_addr_get_sgid(&addr->dev_addr, sgid);
2261 if (dgid)
2262 rdma_addr_get_dgid(&addr->dev_addr, dgid);
2263 }
2264 }
2265 EXPORT_SYMBOL(rdma_read_gids);
2266
2267 static int cma_iw_handler(struct iw_cm_id *iw_id, struct iw_cm_event *iw_event)
2268 {
2269 struct rdma_id_private *id_priv = iw_id->context;
2270 struct rdma_cm_event event = {};
2271 int ret = 0;
2272 struct sockaddr *laddr = (struct sockaddr *)&iw_event->local_addr;
2273 struct sockaddr *raddr = (struct sockaddr *)&iw_event->remote_addr;
2274
2275 mutex_lock(&id_priv->handler_mutex);
2276 if (id_priv->state != RDMA_CM_CONNECT)
2277 goto out;
2278
2279 switch (iw_event->event) {
2280 case IW_CM_EVENT_CLOSE:
2281 event.event = RDMA_CM_EVENT_DISCONNECTED;
2282 break;
2283 case IW_CM_EVENT_CONNECT_REPLY:
2284 memcpy(cma_src_addr(id_priv), laddr,
2285 rdma_addr_size(laddr));
2286 memcpy(cma_dst_addr(id_priv), raddr,
2287 rdma_addr_size(raddr));
2288 switch (iw_event->status) {
2289 case 0:
2290 event.event = RDMA_CM_EVENT_ESTABLISHED;
2291 event.param.conn.initiator_depth = iw_event->ird;
2292 event.param.conn.responder_resources = iw_event->ord;
2293 break;
2294 case -ECONNRESET:
2295 case -ECONNREFUSED:
2296 event.event = RDMA_CM_EVENT_REJECTED;
2297 break;
2298 case -ETIMEDOUT:
2299 event.event = RDMA_CM_EVENT_UNREACHABLE;
2300 break;
2301 default:
2302 event.event = RDMA_CM_EVENT_CONNECT_ERROR;
2303 break;
2304 }
2305 break;
2306 case IW_CM_EVENT_ESTABLISHED:
2307 event.event = RDMA_CM_EVENT_ESTABLISHED;
2308 event.param.conn.initiator_depth = iw_event->ird;
2309 event.param.conn.responder_resources = iw_event->ord;
2310 break;
2311 default:
2312 goto out;
2313 }
2314
2315 event.status = iw_event->status;
2316 event.param.conn.private_data = iw_event->private_data;
2317 event.param.conn.private_data_len = iw_event->private_data_len;
2318 ret = cma_cm_event_handler(id_priv, &event);
2319 if (ret) {
2320 /* Destroy the CM ID by returning a non-zero value. */
2321 id_priv->cm_id.iw = NULL;
2322 cma_exch(id_priv, RDMA_CM_DESTROYING);
2323 mutex_unlock(&id_priv->handler_mutex);
2324 rdma_destroy_id(&id_priv->id);
2325 return ret;
2326 }
2327
2328 out:
2329 mutex_unlock(&id_priv->handler_mutex);
2330 return ret;
2331 }
2332
2333 static int iw_conn_req_handler(struct iw_cm_id *cm_id,
2334 struct iw_cm_event *iw_event)
2335 {
2336 struct rdma_cm_id *new_cm_id;
2337 struct rdma_id_private *listen_id, *conn_id;
2338 struct rdma_cm_event event = {};
2339 int ret = -ECONNABORTED;
2340 struct sockaddr *laddr = (struct sockaddr *)&iw_event->local_addr;
2341 struct sockaddr *raddr = (struct sockaddr *)&iw_event->remote_addr;
2342
2343 event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
2344 event.param.conn.private_data = iw_event->private_data;
2345 event.param.conn.private_data_len = iw_event->private_data_len;
2346 event.param.conn.initiator_depth = iw_event->ird;
2347 event.param.conn.responder_resources = iw_event->ord;
2348
2349 listen_id = cm_id->context;
2350
2351 mutex_lock(&listen_id->handler_mutex);
2352 if (listen_id->state != RDMA_CM_LISTEN)
2353 goto out;
2354
2355 /* Create a new RDMA id for the new IW CM ID */
2356 new_cm_id = __rdma_create_id(listen_id->id.route.addr.dev_addr.net,
2357 listen_id->id.event_handler,
2358 listen_id->id.context,
2359 RDMA_PS_TCP, IB_QPT_RC,
2360 listen_id->res.kern_name);
2361 if (IS_ERR(new_cm_id)) {
2362 ret = -ENOMEM;
2363 goto out;
2364 }
2365 conn_id = container_of(new_cm_id, struct rdma_id_private, id);
2366 mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
2367 conn_id->state = RDMA_CM_CONNECT;
2368
2369 ret = rdma_translate_ip(laddr, &conn_id->id.route.addr.dev_addr);
2370 if (ret) {
2371 mutex_unlock(&conn_id->handler_mutex);
2372 rdma_destroy_id(new_cm_id);
2373 goto out;
2374 }
2375
2376 ret = cma_iw_acquire_dev(conn_id, listen_id);
2377 if (ret) {
2378 mutex_unlock(&conn_id->handler_mutex);
2379 rdma_destroy_id(new_cm_id);
2380 goto out;
2381 }
2382
2383 conn_id->cm_id.iw = cm_id;
2384 cm_id->context = conn_id;
2385 cm_id->cm_handler = cma_iw_handler;
2386
2387 memcpy(cma_src_addr(conn_id), laddr, rdma_addr_size(laddr));
2388 memcpy(cma_dst_addr(conn_id), raddr, rdma_addr_size(raddr));
2389
2390 /*
2391 * Protect against the user destroying conn_id from another thread
2392 * until we're done accessing it.
2393 */
2394 atomic_inc(&conn_id->refcount);
2395 ret = cma_cm_event_handler(conn_id, &event);
2396 if (ret) {
2397 /* User wants to destroy the CM ID */
2398 conn_id->cm_id.iw = NULL;
2399 cma_exch(conn_id, RDMA_CM_DESTROYING);
2400 mutex_unlock(&conn_id->handler_mutex);
2401 mutex_unlock(&listen_id->handler_mutex);
2402 cma_deref_id(conn_id);
2403 rdma_destroy_id(&conn_id->id);
2404 return ret;
2405 }
2406
2407 mutex_unlock(&conn_id->handler_mutex);
2408 cma_deref_id(conn_id);
2409
2410 out:
2411 mutex_unlock(&listen_id->handler_mutex);
2412 return ret;
2413 }
2414
2415 static int cma_ib_listen(struct rdma_id_private *id_priv)
2416 {
2417 struct sockaddr *addr;
2418 struct ib_cm_id *id;
2419 __be64 svc_id;
2420
2421 addr = cma_src_addr(id_priv);
2422 svc_id = rdma_get_service_id(&id_priv->id, addr);
2423 id = ib_cm_insert_listen(id_priv->id.device,
2424 cma_ib_req_handler, svc_id);
2425 if (IS_ERR(id))
2426 return PTR_ERR(id);
2427 id_priv->cm_id.ib = id;
2428
2429 return 0;
2430 }
2431
2432 static int cma_iw_listen(struct rdma_id_private *id_priv, int backlog)
2433 {
2434 int ret;
2435 struct iw_cm_id *id;
2436
2437 id = iw_create_cm_id(id_priv->id.device,
2438 iw_conn_req_handler,
2439 id_priv);
2440 if (IS_ERR(id))
2441 return PTR_ERR(id);
2442
2443 id->tos = id_priv->tos;
2444 id->tos_set = id_priv->tos_set;
2445 id_priv->cm_id.iw = id;
2446
2447 memcpy(&id_priv->cm_id.iw->local_addr, cma_src_addr(id_priv),
2448 rdma_addr_size(cma_src_addr(id_priv)));
2449
2450 ret = iw_cm_listen(id_priv->cm_id.iw, backlog);
2451
2452 if (ret) {
2453 iw_destroy_cm_id(id_priv->cm_id.iw);
2454 id_priv->cm_id.iw = NULL;
2455 }
2456
2457 return ret;
2458 }
2459
2460 static int cma_listen_handler(struct rdma_cm_id *id,
2461 struct rdma_cm_event *event)
2462 {
2463 struct rdma_id_private *id_priv = id->context;
2464
2465 id->context = id_priv->id.context;
2466 id->event_handler = id_priv->id.event_handler;
2467 trace_cm_event_handler(id_priv, event);
2468 return id_priv->id.event_handler(id, event);
2469 }
2470
2471 static void cma_listen_on_dev(struct rdma_id_private *id_priv,
2472 struct cma_device *cma_dev)
2473 {
2474 struct rdma_id_private *dev_id_priv;
2475 struct rdma_cm_id *id;
2476 struct net *net = id_priv->id.route.addr.dev_addr.net;
2477 int ret;
2478
2479 if (cma_family(id_priv) == AF_IB && !rdma_cap_ib_cm(cma_dev->device, 1))
2480 return;
2481
2482 id = __rdma_create_id(net, cma_listen_handler, id_priv, id_priv->id.ps,
2483 id_priv->id.qp_type, id_priv->res.kern_name);
2484 if (IS_ERR(id))
2485 return;
2486
2487 dev_id_priv = container_of(id, struct rdma_id_private, id);
2488
2489 dev_id_priv->state = RDMA_CM_ADDR_BOUND;
2490 memcpy(cma_src_addr(dev_id_priv), cma_src_addr(id_priv),
2491 rdma_addr_size(cma_src_addr(id_priv)));
2492
2493 _cma_attach_to_dev(dev_id_priv, cma_dev);
2494 list_add_tail(&dev_id_priv->listen_list, &id_priv->listen_list);
2495 atomic_inc(&id_priv->refcount);
2496 dev_id_priv->internal_id = 1;
2497 dev_id_priv->afonly = id_priv->afonly;
2498 dev_id_priv->tos_set = id_priv->tos_set;
2499 dev_id_priv->tos = id_priv->tos;
2500
2501 ret = rdma_listen(id, id_priv->backlog);
2502 if (ret)
2503 dev_warn(&cma_dev->device->dev,
2504 "RDMA CMA: cma_listen_on_dev, error %d\n", ret);
2505 }
2506
2507 static void cma_listen_on_all(struct rdma_id_private *id_priv)
2508 {
2509 struct cma_device *cma_dev;
2510
2511 mutex_lock(&lock);
2512 list_add_tail(&id_priv->list, &listen_any_list);
2513 list_for_each_entry(cma_dev, &dev_list, list)
2514 cma_listen_on_dev(id_priv, cma_dev);
2515 mutex_unlock(&lock);
2516 }
2517
2518 void rdma_set_service_type(struct rdma_cm_id *id, int tos)
2519 {
2520 struct rdma_id_private *id_priv;
2521
2522 id_priv = container_of(id, struct rdma_id_private, id);
2523 id_priv->tos = (u8) tos;
2524 id_priv->tos_set = true;
2525 }
2526 EXPORT_SYMBOL(rdma_set_service_type);
2527
2528 /**
2529 * rdma_set_ack_timeout() - Set the ack timeout of QP associated
2530 * with a connection identifier.
2531 * @id: Communication identifier to associated with service type.
2532 * @timeout: Ack timeout to set a QP, expressed as 4.096 * 2^(timeout) usec.
2533 *
2534 * This function should be called before rdma_connect() on active side,
2535 * and on passive side before rdma_accept(). It is applicable to primary
2536 * path only. The timeout will affect the local side of the QP, it is not
2537 * negotiated with remote side and zero disables the timer. In case it is
2538 * set before rdma_resolve_route, the value will also be used to determine
2539 * PacketLifeTime for RoCE.
2540 *
2541 * Return: 0 for success
2542 */
2543 int rdma_set_ack_timeout(struct rdma_cm_id *id, u8 timeout)
2544 {
2545 struct rdma_id_private *id_priv;
2546
2547 if (id->qp_type != IB_QPT_RC)
2548 return -EINVAL;
2549
2550 id_priv = container_of(id, struct rdma_id_private, id);
2551 id_priv->timeout = timeout;
2552 id_priv->timeout_set = true;
2553
2554 return 0;
2555 }
2556 EXPORT_SYMBOL(rdma_set_ack_timeout);
2557
2558 static void cma_query_handler(int status, struct sa_path_rec *path_rec,
2559 void *context)
2560 {
2561 struct cma_work *work = context;
2562 struct rdma_route *route;
2563
2564 route = &work->id->id.route;
2565
2566 if (!status) {
2567 route->num_paths = 1;
2568 *route->path_rec = *path_rec;
2569 } else {
2570 work->old_state = RDMA_CM_ROUTE_QUERY;
2571 work->new_state = RDMA_CM_ADDR_RESOLVED;
2572 work->event.event = RDMA_CM_EVENT_ROUTE_ERROR;
2573 work->event.status = status;
2574 pr_debug_ratelimited("RDMA CM: ROUTE_ERROR: failed to query path. status %d\n",
2575 status);
2576 }
2577
2578 queue_work(cma_wq, &work->work);
2579 }
2580
2581 static int cma_query_ib_route(struct rdma_id_private *id_priv,
2582 unsigned long timeout_ms, struct cma_work *work)
2583 {
2584 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
2585 struct sa_path_rec path_rec;
2586 ib_sa_comp_mask comp_mask;
2587 struct sockaddr_in6 *sin6;
2588 struct sockaddr_ib *sib;
2589
2590 memset(&path_rec, 0, sizeof path_rec);
2591
2592 if (rdma_cap_opa_ah(id_priv->id.device, id_priv->id.port_num))
2593 path_rec.rec_type = SA_PATH_REC_TYPE_OPA;
2594 else
2595 path_rec.rec_type = SA_PATH_REC_TYPE_IB;
2596 rdma_addr_get_sgid(dev_addr, &path_rec.sgid);
2597 rdma_addr_get_dgid(dev_addr, &path_rec.dgid);
2598 path_rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
2599 path_rec.numb_path = 1;
2600 path_rec.reversible = 1;
2601 path_rec.service_id = rdma_get_service_id(&id_priv->id,
2602 cma_dst_addr(id_priv));
2603
2604 comp_mask = IB_SA_PATH_REC_DGID | IB_SA_PATH_REC_SGID |
2605 IB_SA_PATH_REC_PKEY | IB_SA_PATH_REC_NUMB_PATH |
2606 IB_SA_PATH_REC_REVERSIBLE | IB_SA_PATH_REC_SERVICE_ID;
2607
2608 switch (cma_family(id_priv)) {
2609 case AF_INET:
2610 path_rec.qos_class = cpu_to_be16((u16) id_priv->tos);
2611 comp_mask |= IB_SA_PATH_REC_QOS_CLASS;
2612 break;
2613 case AF_INET6:
2614 sin6 = (struct sockaddr_in6 *) cma_src_addr(id_priv);
2615 path_rec.traffic_class = (u8) (be32_to_cpu(sin6->sin6_flowinfo) >> 20);
2616 comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
2617 break;
2618 case AF_IB:
2619 sib = (struct sockaddr_ib *) cma_src_addr(id_priv);
2620 path_rec.traffic_class = (u8) (be32_to_cpu(sib->sib_flowinfo) >> 20);
2621 comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
2622 break;
2623 }
2624
2625 id_priv->query_id = ib_sa_path_rec_get(&sa_client, id_priv->id.device,
2626 id_priv->id.port_num, &path_rec,
2627 comp_mask, timeout_ms,
2628 GFP_KERNEL, cma_query_handler,
2629 work, &id_priv->query);
2630
2631 return (id_priv->query_id < 0) ? id_priv->query_id : 0;
2632 }
2633
2634 static void cma_work_handler(struct work_struct *_work)
2635 {
2636 struct cma_work *work = container_of(_work, struct cma_work, work);
2637 struct rdma_id_private *id_priv = work->id;
2638 int destroy = 0;
2639
2640 mutex_lock(&id_priv->handler_mutex);
2641 if (!cma_comp_exch(id_priv, work->old_state, work->new_state))
2642 goto out;
2643
2644 if (cma_cm_event_handler(id_priv, &work->event)) {
2645 cma_exch(id_priv, RDMA_CM_DESTROYING);
2646 destroy = 1;
2647 }
2648 out:
2649 mutex_unlock(&id_priv->handler_mutex);
2650 cma_deref_id(id_priv);
2651 if (destroy)
2652 rdma_destroy_id(&id_priv->id);
2653 kfree(work);
2654 }
2655
2656 static void cma_ndev_work_handler(struct work_struct *_work)
2657 {
2658 struct cma_ndev_work *work = container_of(_work, struct cma_ndev_work, work);
2659 struct rdma_id_private *id_priv = work->id;
2660 int destroy = 0;
2661
2662 mutex_lock(&id_priv->handler_mutex);
2663 if (id_priv->state == RDMA_CM_DESTROYING ||
2664 id_priv->state == RDMA_CM_DEVICE_REMOVAL)
2665 goto out;
2666
2667 if (cma_cm_event_handler(id_priv, &work->event)) {
2668 cma_exch(id_priv, RDMA_CM_DESTROYING);
2669 destroy = 1;
2670 }
2671
2672 out:
2673 mutex_unlock(&id_priv->handler_mutex);
2674 cma_deref_id(id_priv);
2675 if (destroy)
2676 rdma_destroy_id(&id_priv->id);
2677 kfree(work);
2678 }
2679
2680 static void cma_init_resolve_route_work(struct cma_work *work,
2681 struct rdma_id_private *id_priv)
2682 {
2683 work->id = id_priv;
2684 INIT_WORK(&work->work, cma_work_handler);
2685 work->old_state = RDMA_CM_ROUTE_QUERY;
2686 work->new_state = RDMA_CM_ROUTE_RESOLVED;
2687 work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
2688 }
2689
2690 static void cma_init_resolve_addr_work(struct cma_work *work,
2691 struct rdma_id_private *id_priv)
2692 {
2693 work->id = id_priv;
2694 INIT_WORK(&work->work, cma_work_handler);
2695 work->old_state = RDMA_CM_ADDR_QUERY;
2696 work->new_state = RDMA_CM_ADDR_RESOLVED;
2697 work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
2698 }
2699
2700 static int cma_resolve_ib_route(struct rdma_id_private *id_priv,
2701 unsigned long timeout_ms)
2702 {
2703 struct rdma_route *route = &id_priv->id.route;
2704 struct cma_work *work;
2705 int ret;
2706
2707 work = kzalloc(sizeof *work, GFP_KERNEL);
2708 if (!work)
2709 return -ENOMEM;
2710
2711 cma_init_resolve_route_work(work, id_priv);
2712
2713 route->path_rec = kmalloc(sizeof *route->path_rec, GFP_KERNEL);
2714 if (!route->path_rec) {
2715 ret = -ENOMEM;
2716 goto err1;
2717 }
2718
2719 ret = cma_query_ib_route(id_priv, timeout_ms, work);
2720 if (ret)
2721 goto err2;
2722
2723 return 0;
2724 err2:
2725 kfree(route->path_rec);
2726 route->path_rec = NULL;
2727 err1:
2728 kfree(work);
2729 return ret;
2730 }
2731
2732 static enum ib_gid_type cma_route_gid_type(enum rdma_network_type network_type,
2733 unsigned long supported_gids,
2734 enum ib_gid_type default_gid)
2735 {
2736 if ((network_type == RDMA_NETWORK_IPV4 ||
2737 network_type == RDMA_NETWORK_IPV6) &&
2738 test_bit(IB_GID_TYPE_ROCE_UDP_ENCAP, &supported_gids))
2739 return IB_GID_TYPE_ROCE_UDP_ENCAP;
2740
2741 return default_gid;
2742 }
2743
2744 /*
2745 * cma_iboe_set_path_rec_l2_fields() is helper function which sets
2746 * path record type based on GID type.
2747 * It also sets up other L2 fields which includes destination mac address
2748 * netdev ifindex, of the path record.
2749 * It returns the netdev of the bound interface for this path record entry.
2750 */
2751 static struct net_device *
2752 cma_iboe_set_path_rec_l2_fields(struct rdma_id_private *id_priv)
2753 {
2754 struct rdma_route *route = &id_priv->id.route;
2755 enum ib_gid_type gid_type = IB_GID_TYPE_ROCE;
2756 struct rdma_addr *addr = &route->addr;
2757 unsigned long supported_gids;
2758 struct net_device *ndev;
2759
2760 if (!addr->dev_addr.bound_dev_if)
2761 return NULL;
2762
2763 ndev = dev_get_by_index(addr->dev_addr.net,
2764 addr->dev_addr.bound_dev_if);
2765 if (!ndev)
2766 return NULL;
2767
2768 supported_gids = roce_gid_type_mask_support(id_priv->id.device,
2769 id_priv->id.port_num);
2770 gid_type = cma_route_gid_type(addr->dev_addr.network,
2771 supported_gids,
2772 id_priv->gid_type);
2773 /* Use the hint from IP Stack to select GID Type */
2774 if (gid_type < ib_network_to_gid_type(addr->dev_addr.network))
2775 gid_type = ib_network_to_gid_type(addr->dev_addr.network);
2776 route->path_rec->rec_type = sa_conv_gid_to_pathrec_type(gid_type);
2777
2778 route->path_rec->roce.route_resolved = true;
2779 sa_path_set_dmac(route->path_rec, addr->dev_addr.dst_dev_addr);
2780 return ndev;
2781 }
2782
2783 int rdma_set_ib_path(struct rdma_cm_id *id,
2784 struct sa_path_rec *path_rec)
2785 {
2786 struct rdma_id_private *id_priv;
2787 struct net_device *ndev;
2788 int ret;
2789
2790 id_priv = container_of(id, struct rdma_id_private, id);
2791 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED,
2792 RDMA_CM_ROUTE_RESOLVED))
2793 return -EINVAL;
2794
2795 id->route.path_rec = kmemdup(path_rec, sizeof(*path_rec),
2796 GFP_KERNEL);
2797 if (!id->route.path_rec) {
2798 ret = -ENOMEM;
2799 goto err;
2800 }
2801
2802 if (rdma_protocol_roce(id->device, id->port_num)) {
2803 ndev = cma_iboe_set_path_rec_l2_fields(id_priv);
2804 if (!ndev) {
2805 ret = -ENODEV;
2806 goto err_free;
2807 }
2808 dev_put(ndev);
2809 }
2810
2811 id->route.num_paths = 1;
2812 return 0;
2813
2814 err_free:
2815 kfree(id->route.path_rec);
2816 id->route.path_rec = NULL;
2817 err:
2818 cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_ADDR_RESOLVED);
2819 return ret;
2820 }
2821 EXPORT_SYMBOL(rdma_set_ib_path);
2822
2823 static int cma_resolve_iw_route(struct rdma_id_private *id_priv)
2824 {
2825 struct cma_work *work;
2826
2827 work = kzalloc(sizeof *work, GFP_KERNEL);
2828 if (!work)
2829 return -ENOMEM;
2830
2831 cma_init_resolve_route_work(work, id_priv);
2832 queue_work(cma_wq, &work->work);
2833 return 0;
2834 }
2835
2836 static int get_vlan_ndev_tc(struct net_device *vlan_ndev, int prio)
2837 {
2838 struct net_device *dev;
2839
2840 dev = vlan_dev_real_dev(vlan_ndev);
2841 if (dev->num_tc)
2842 return netdev_get_prio_tc_map(dev, prio);
2843
2844 return (vlan_dev_get_egress_qos_mask(vlan_ndev, prio) &
2845 VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
2846 }
2847
2848 struct iboe_prio_tc_map {
2849 int input_prio;
2850 int output_tc;
2851 bool found;
2852 };
2853
2854 static int get_lower_vlan_dev_tc(struct net_device *dev, void *data)
2855 {
2856 struct iboe_prio_tc_map *map = data;
2857
2858 if (is_vlan_dev(dev))
2859 map->output_tc = get_vlan_ndev_tc(dev, map->input_prio);
2860 else if (dev->num_tc)
2861 map->output_tc = netdev_get_prio_tc_map(dev, map->input_prio);
2862 else
2863 map->output_tc = 0;
2864 /* We are interested only in first level VLAN device, so always
2865 * return 1 to stop iterating over next level devices.
2866 */
2867 map->found = true;
2868 return 1;
2869 }
2870
2871 static int iboe_tos_to_sl(struct net_device *ndev, int tos)
2872 {
2873 struct iboe_prio_tc_map prio_tc_map = {};
2874 int prio = rt_tos2priority(tos);
2875
2876 /* If VLAN device, get it directly from the VLAN netdev */
2877 if (is_vlan_dev(ndev))
2878 return get_vlan_ndev_tc(ndev, prio);
2879
2880 prio_tc_map.input_prio = prio;
2881 rcu_read_lock();
2882 netdev_walk_all_lower_dev_rcu(ndev,
2883 get_lower_vlan_dev_tc,
2884 &prio_tc_map);
2885 rcu_read_unlock();
2886 /* If map is found from lower device, use it; Otherwise
2887 * continue with the current netdevice to get priority to tc map.
2888 */
2889 if (prio_tc_map.found)
2890 return prio_tc_map.output_tc;
2891 else if (ndev->num_tc)
2892 return netdev_get_prio_tc_map(ndev, prio);
2893 else
2894 return 0;
2895 }
2896
2897 static int cma_resolve_iboe_route(struct rdma_id_private *id_priv)
2898 {
2899 struct rdma_route *route = &id_priv->id.route;
2900 struct rdma_addr *addr = &route->addr;
2901 struct cma_work *work;
2902 int ret;
2903 struct net_device *ndev;
2904
2905 u8 default_roce_tos = id_priv->cma_dev->default_roce_tos[id_priv->id.port_num -
2906 rdma_start_port(id_priv->cma_dev->device)];
2907 u8 tos = id_priv->tos_set ? id_priv->tos : default_roce_tos;
2908
2909
2910 work = kzalloc(sizeof *work, GFP_KERNEL);
2911 if (!work)
2912 return -ENOMEM;
2913
2914 route->path_rec = kzalloc(sizeof *route->path_rec, GFP_KERNEL);
2915 if (!route->path_rec) {
2916 ret = -ENOMEM;
2917 goto err1;
2918 }
2919
2920 route->num_paths = 1;
2921
2922 ndev = cma_iboe_set_path_rec_l2_fields(id_priv);
2923 if (!ndev) {
2924 ret = -ENODEV;
2925 goto err2;
2926 }
2927
2928 rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
2929 &route->path_rec->sgid);
2930 rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.dst_addr,
2931 &route->path_rec->dgid);
2932
2933 if (((struct sockaddr *)&id_priv->id.route.addr.dst_addr)->sa_family != AF_IB)
2934 /* TODO: get the hoplimit from the inet/inet6 device */
2935 route->path_rec->hop_limit = addr->dev_addr.hoplimit;
2936 else
2937 route->path_rec->hop_limit = 1;
2938 route->path_rec->reversible = 1;
2939 route->path_rec->pkey = cpu_to_be16(0xffff);
2940 route->path_rec->mtu_selector = IB_SA_EQ;
2941 route->path_rec->sl = iboe_tos_to_sl(ndev, tos);
2942 route->path_rec->traffic_class = tos;
2943 route->path_rec->mtu = iboe_get_mtu(ndev->mtu);
2944 route->path_rec->rate_selector = IB_SA_EQ;
2945 route->path_rec->rate = iboe_get_rate(ndev);
2946 dev_put(ndev);
2947 route->path_rec->packet_life_time_selector = IB_SA_EQ;
2948 /* In case ACK timeout is set, use this value to calculate
2949 * PacketLifeTime. As per IBTA 12.7.34,
2950 * local ACK timeout = (2 * PacketLifeTime + Local CA’s ACK delay).
2951 * Assuming a negligible local ACK delay, we can use
2952 * PacketLifeTime = local ACK timeout/2
2953 * as a reasonable approximation for RoCE networks.
2954 */
2955 route->path_rec->packet_life_time = id_priv->timeout_set ?
2956 id_priv->timeout - 1 : CMA_IBOE_PACKET_LIFETIME;
2957
2958 if (!route->path_rec->mtu) {
2959 ret = -EINVAL;
2960 goto err2;
2961 }
2962
2963 cma_init_resolve_route_work(work, id_priv);
2964 queue_work(cma_wq, &work->work);
2965
2966 return 0;
2967
2968 err2:
2969 kfree(route->path_rec);
2970 route->path_rec = NULL;
2971 err1:
2972 kfree(work);
2973 return ret;
2974 }
2975
2976 int rdma_resolve_route(struct rdma_cm_id *id, unsigned long timeout_ms)
2977 {
2978 struct rdma_id_private *id_priv;
2979 int ret;
2980
2981 id_priv = container_of(id, struct rdma_id_private, id);
2982 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED, RDMA_CM_ROUTE_QUERY))
2983 return -EINVAL;
2984
2985 atomic_inc(&id_priv->refcount);
2986 if (rdma_cap_ib_sa(id->device, id->port_num))
2987 ret = cma_resolve_ib_route(id_priv, timeout_ms);
2988 else if (rdma_protocol_roce(id->device, id->port_num))
2989 ret = cma_resolve_iboe_route(id_priv);
2990 else if (rdma_protocol_iwarp(id->device, id->port_num))
2991 ret = cma_resolve_iw_route(id_priv);
2992 else
2993 ret = -ENOSYS;
2994
2995 if (ret)
2996 goto err;
2997
2998 return 0;
2999 err:
3000 cma_comp_exch(id_priv, RDMA_CM_ROUTE_QUERY, RDMA_CM_ADDR_RESOLVED);
3001 cma_deref_id(id_priv);
3002 return ret;
3003 }
3004 EXPORT_SYMBOL(rdma_resolve_route);
3005
3006 static void cma_set_loopback(struct sockaddr *addr)
3007 {
3008 switch (addr->sa_family) {
3009 case AF_INET:
3010 ((struct sockaddr_in *) addr)->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
3011 break;
3012 case AF_INET6:
3013 ipv6_addr_set(&((struct sockaddr_in6 *) addr)->sin6_addr,
3014 0, 0, 0, htonl(1));
3015 break;
3016 default:
3017 ib_addr_set(&((struct sockaddr_ib *) addr)->sib_addr,
3018 0, 0, 0, htonl(1));
3019 break;
3020 }
3021 }
3022
3023 static int cma_bind_loopback(struct rdma_id_private *id_priv)
3024 {
3025 struct cma_device *cma_dev, *cur_dev;
3026 union ib_gid gid;
3027 enum ib_port_state port_state;
3028 u16 pkey;
3029 int ret;
3030 u8 p;
3031
3032 cma_dev = NULL;
3033 mutex_lock(&lock);
3034 list_for_each_entry(cur_dev, &dev_list, list) {
3035 if (cma_family(id_priv) == AF_IB &&
3036 !rdma_cap_ib_cm(cur_dev->device, 1))
3037 continue;
3038
3039 if (!cma_dev)
3040 cma_dev = cur_dev;
3041
3042 for (p = 1; p <= cur_dev->device->phys_port_cnt; ++p) {
3043 if (!ib_get_cached_port_state(cur_dev->device, p, &port_state) &&
3044 port_state == IB_PORT_ACTIVE) {
3045 cma_dev = cur_dev;
3046 goto port_found;
3047 }
3048 }
3049 }
3050
3051 if (!cma_dev) {
3052 ret = -ENODEV;
3053 goto out;
3054 }
3055
3056 p = 1;
3057
3058 port_found:
3059 ret = rdma_query_gid(cma_dev->device, p, 0, &gid);
3060 if (ret)
3061 goto out;
3062
3063 ret = ib_get_cached_pkey(cma_dev->device, p, 0, &pkey);
3064 if (ret)
3065 goto out;
3066
3067 id_priv->id.route.addr.dev_addr.dev_type =
3068 (rdma_protocol_ib(cma_dev->device, p)) ?
3069 ARPHRD_INFINIBAND : ARPHRD_ETHER;
3070
3071 rdma_addr_set_sgid(&id_priv->id.route.addr.dev_addr, &gid);
3072 ib_addr_set_pkey(&id_priv->id.route.addr.dev_addr, pkey);
3073 id_priv->id.port_num = p;
3074 cma_attach_to_dev(id_priv, cma_dev);
3075 cma_set_loopback(cma_src_addr(id_priv));
3076 out:
3077 mutex_unlock(&lock);
3078 return ret;
3079 }
3080
3081 static void addr_handler(int status, struct sockaddr *src_addr,
3082 struct rdma_dev_addr *dev_addr, void *context)
3083 {
3084 struct rdma_id_private *id_priv = context;
3085 struct rdma_cm_event event = {};
3086 struct sockaddr *addr;
3087 struct sockaddr_storage old_addr;
3088
3089 mutex_lock(&id_priv->handler_mutex);
3090 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY,
3091 RDMA_CM_ADDR_RESOLVED))
3092 goto out;
3093
3094 /*
3095 * Store the previous src address, so that if we fail to acquire
3096 * matching rdma device, old address can be restored back, which helps
3097 * to cancel the cma listen operation correctly.
3098 */
3099 addr = cma_src_addr(id_priv);
3100 memcpy(&old_addr, addr, rdma_addr_size(addr));
3101 memcpy(addr, src_addr, rdma_addr_size(src_addr));
3102 if (!status && !id_priv->cma_dev) {
3103 status = cma_acquire_dev_by_src_ip(id_priv);
3104 if (status)
3105 pr_debug_ratelimited("RDMA CM: ADDR_ERROR: failed to acquire device. status %d\n",
3106 status);
3107 } else if (status) {
3108 pr_debug_ratelimited("RDMA CM: ADDR_ERROR: failed to resolve IP. status %d\n", status);
3109 }
3110
3111 if (status) {
3112 memcpy(addr, &old_addr,
3113 rdma_addr_size((struct sockaddr *)&old_addr));
3114 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED,
3115 RDMA_CM_ADDR_BOUND))
3116 goto out;
3117 event.event = RDMA_CM_EVENT_ADDR_ERROR;
3118 event.status = status;
3119 } else
3120 event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
3121
3122 if (cma_cm_event_handler(id_priv, &event)) {
3123 cma_exch(id_priv, RDMA_CM_DESTROYING);
3124 mutex_unlock(&id_priv->handler_mutex);
3125 rdma_destroy_id(&id_priv->id);
3126 return;
3127 }
3128 out:
3129 mutex_unlock(&id_priv->handler_mutex);
3130 }
3131
3132 static int cma_resolve_loopback(struct rdma_id_private *id_priv)
3133 {
3134 struct cma_work *work;
3135 union ib_gid gid;
3136 int ret;
3137
3138 work = kzalloc(sizeof *work, GFP_KERNEL);
3139 if (!work)
3140 return -ENOMEM;
3141
3142 if (!id_priv->cma_dev) {
3143 ret = cma_bind_loopback(id_priv);
3144 if (ret)
3145 goto err;
3146 }
3147
3148 rdma_addr_get_sgid(&id_priv->id.route.addr.dev_addr, &gid);
3149 rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, &gid);
3150
3151 atomic_inc(&id_priv->refcount);
3152 cma_init_resolve_addr_work(work, id_priv);
3153 queue_work(cma_wq, &work->work);
3154 return 0;
3155 err:
3156 kfree(work);
3157 return ret;
3158 }
3159
3160 static int cma_resolve_ib_addr(struct rdma_id_private *id_priv)
3161 {
3162 struct cma_work *work;
3163 int ret;
3164
3165 work = kzalloc(sizeof *work, GFP_KERNEL);
3166 if (!work)
3167 return -ENOMEM;
3168
3169 if (!id_priv->cma_dev) {
3170 ret = cma_resolve_ib_dev(id_priv);
3171 if (ret)
3172 goto err;
3173 }
3174
3175 rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, (union ib_gid *)
3176 &(((struct sockaddr_ib *) &id_priv->id.route.addr.dst_addr)->sib_addr));
3177
3178 atomic_inc(&id_priv->refcount);
3179 cma_init_resolve_addr_work(work, id_priv);
3180 queue_work(cma_wq, &work->work);
3181 return 0;
3182 err:
3183 kfree(work);
3184 return ret;
3185 }
3186
3187 static int cma_bind_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
3188 const struct sockaddr *dst_addr)
3189 {
3190 if (!src_addr || !src_addr->sa_family) {
3191 src_addr = (struct sockaddr *) &id->route.addr.src_addr;
3192 src_addr->sa_family = dst_addr->sa_family;
3193 if (IS_ENABLED(CONFIG_IPV6) &&
3194 dst_addr->sa_family == AF_INET6) {
3195 struct sockaddr_in6 *src_addr6 = (struct sockaddr_in6 *) src_addr;
3196 struct sockaddr_in6 *dst_addr6 = (struct sockaddr_in6 *) dst_addr;
3197 src_addr6->sin6_scope_id = dst_addr6->sin6_scope_id;
3198 if (ipv6_addr_type(&dst_addr6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
3199 id->route.addr.dev_addr.bound_dev_if = dst_addr6->sin6_scope_id;
3200 } else if (dst_addr->sa_family == AF_IB) {
3201 ((struct sockaddr_ib *) src_addr)->sib_pkey =
3202 ((struct sockaddr_ib *) dst_addr)->sib_pkey;
3203 }
3204 }
3205 return rdma_bind_addr(id, src_addr);
3206 }
3207
3208 int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
3209 const struct sockaddr *dst_addr, unsigned long timeout_ms)
3210 {
3211 struct rdma_id_private *id_priv;
3212 int ret;
3213
3214 id_priv = container_of(id, struct rdma_id_private, id);
3215 if (id_priv->state == RDMA_CM_IDLE) {
3216 ret = cma_bind_addr(id, src_addr, dst_addr);
3217 if (ret)
3218 return ret;
3219 }
3220
3221 if (cma_family(id_priv) != dst_addr->sa_family)
3222 return -EINVAL;
3223
3224 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_ADDR_QUERY))
3225 return -EINVAL;
3226
3227 memcpy(cma_dst_addr(id_priv), dst_addr, rdma_addr_size(dst_addr));
3228 if (cma_any_addr(dst_addr)) {
3229 ret = cma_resolve_loopback(id_priv);
3230 } else {
3231 if (dst_addr->sa_family == AF_IB) {
3232 ret = cma_resolve_ib_addr(id_priv);
3233 } else {
3234 ret = rdma_resolve_ip(cma_src_addr(id_priv), dst_addr,
3235 &id->route.addr.dev_addr,
3236 timeout_ms, addr_handler,
3237 false, id_priv);
3238 }
3239 }
3240 if (ret)
3241 goto err;
3242
3243 return 0;
3244 err:
3245 cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY, RDMA_CM_ADDR_BOUND);
3246 return ret;
3247 }
3248 EXPORT_SYMBOL(rdma_resolve_addr);
3249
3250 int rdma_set_reuseaddr(struct rdma_cm_id *id, int reuse)
3251 {
3252 struct rdma_id_private *id_priv;
3253 unsigned long flags;
3254 int ret;
3255
3256 id_priv = container_of(id, struct rdma_id_private, id);
3257 spin_lock_irqsave(&id_priv->lock, flags);
3258 if (reuse || id_priv->state == RDMA_CM_IDLE) {
3259 id_priv->reuseaddr = reuse;
3260 ret = 0;
3261 } else {
3262 ret = -EINVAL;
3263 }
3264 spin_unlock_irqrestore(&id_priv->lock, flags);
3265 return ret;
3266 }
3267 EXPORT_SYMBOL(rdma_set_reuseaddr);
3268
3269 int rdma_set_afonly(struct rdma_cm_id *id, int afonly)
3270 {
3271 struct rdma_id_private *id_priv;
3272 unsigned long flags;
3273 int ret;
3274
3275 id_priv = container_of(id, struct rdma_id_private, id);
3276 spin_lock_irqsave(&id_priv->lock, flags);
3277 if (id_priv->state == RDMA_CM_IDLE || id_priv->state == RDMA_CM_ADDR_BOUND) {
3278 id_priv->options |= (1 << CMA_OPTION_AFONLY);
3279 id_priv->afonly = afonly;
3280 ret = 0;
3281 } else {
3282 ret = -EINVAL;
3283 }
3284 spin_unlock_irqrestore(&id_priv->lock, flags);
3285 return ret;
3286 }
3287 EXPORT_SYMBOL(rdma_set_afonly);
3288
3289 static void cma_bind_port(struct rdma_bind_list *bind_list,
3290 struct rdma_id_private *id_priv)
3291 {
3292 struct sockaddr *addr;
3293 struct sockaddr_ib *sib;
3294 u64 sid, mask;
3295 __be16 port;
3296
3297 addr = cma_src_addr(id_priv);
3298 port = htons(bind_list->port);
3299
3300 switch (addr->sa_family) {
3301 case AF_INET:
3302 ((struct sockaddr_in *) addr)->sin_port = port;
3303 break;
3304 case AF_INET6:
3305 ((struct sockaddr_in6 *) addr)->sin6_port = port;
3306 break;
3307 case AF_IB:
3308 sib = (struct sockaddr_ib *) addr;
3309 sid = be64_to_cpu(sib->sib_sid);
3310 mask = be64_to_cpu(sib->sib_sid_mask);
3311 sib->sib_sid = cpu_to_be64((sid & mask) | (u64) ntohs(port));
3312 sib->sib_sid_mask = cpu_to_be64(~0ULL);
3313 break;
3314 }
3315 id_priv->bind_list = bind_list;
3316 hlist_add_head(&id_priv->node, &bind_list->owners);
3317 }
3318
3319 static int cma_alloc_port(enum rdma_ucm_port_space ps,
3320 struct rdma_id_private *id_priv, unsigned short snum)
3321 {
3322 struct rdma_bind_list *bind_list;
3323 int ret;
3324
3325 bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL);
3326 if (!bind_list)
3327 return -ENOMEM;
3328
3329 ret = cma_ps_alloc(id_priv->id.route.addr.dev_addr.net, ps, bind_list,
3330 snum);
3331 if (ret < 0)
3332 goto err;
3333
3334 bind_list->ps = ps;
3335 bind_list->port = snum;
3336 cma_bind_port(bind_list, id_priv);
3337 return 0;
3338 err:
3339 kfree(bind_list);
3340 return ret == -ENOSPC ? -EADDRNOTAVAIL : ret;
3341 }
3342
3343 static int cma_port_is_unique(struct rdma_bind_list *bind_list,
3344 struct rdma_id_private *id_priv)
3345 {
3346 struct rdma_id_private *cur_id;
3347 struct sockaddr *daddr = cma_dst_addr(id_priv);
3348 struct sockaddr *saddr = cma_src_addr(id_priv);
3349 __be16 dport = cma_port(daddr);
3350
3351 hlist_for_each_entry(cur_id, &bind_list->owners, node) {
3352 struct sockaddr *cur_daddr = cma_dst_addr(cur_id);
3353 struct sockaddr *cur_saddr = cma_src_addr(cur_id);
3354 __be16 cur_dport = cma_port(cur_daddr);
3355
3356 if (id_priv == cur_id)
3357 continue;
3358
3359 /* different dest port -> unique */
3360 if (!cma_any_port(daddr) &&
3361 !cma_any_port(cur_daddr) &&
3362 (dport != cur_dport))
3363 continue;
3364
3365 /* different src address -> unique */
3366 if (!cma_any_addr(saddr) &&
3367 !cma_any_addr(cur_saddr) &&
3368 cma_addr_cmp(saddr, cur_saddr))
3369 continue;
3370
3371 /* different dst address -> unique */
3372 if (!cma_any_addr(daddr) &&
3373 !cma_any_addr(cur_daddr) &&
3374 cma_addr_cmp(daddr, cur_daddr))
3375 continue;
3376
3377 return -EADDRNOTAVAIL;
3378 }
3379 return 0;
3380 }
3381
3382 static int cma_alloc_any_port(enum rdma_ucm_port_space ps,
3383 struct rdma_id_private *id_priv)
3384 {
3385 static unsigned int last_used_port;
3386 int low, high, remaining;
3387 unsigned int rover;
3388 struct net *net = id_priv->id.route.addr.dev_addr.net;
3389
3390 inet_get_local_port_range(net, &low, &high);
3391 remaining = (high - low) + 1;
3392 rover = prandom_u32() % remaining + low;
3393 retry:
3394 if (last_used_port != rover) {
3395 struct rdma_bind_list *bind_list;
3396 int ret;
3397
3398 bind_list = cma_ps_find(net, ps, (unsigned short)rover);
3399
3400 if (!bind_list) {
3401 ret = cma_alloc_port(ps, id_priv, rover);
3402 } else {
3403 ret = cma_port_is_unique(bind_list, id_priv);
3404 if (!ret)
3405 cma_bind_port(bind_list, id_priv);
3406 }
3407 /*
3408 * Remember previously used port number in order to avoid
3409 * re-using same port immediately after it is closed.
3410 */
3411 if (!ret)
3412 last_used_port = rover;
3413 if (ret != -EADDRNOTAVAIL)
3414 return ret;
3415 }
3416 if (--remaining) {
3417 rover++;
3418 if ((rover < low) || (rover > high))
3419 rover = low;
3420 goto retry;
3421 }
3422 return -EADDRNOTAVAIL;
3423 }
3424
3425 /*
3426 * Check that the requested port is available. This is called when trying to
3427 * bind to a specific port, or when trying to listen on a bound port. In
3428 * the latter case, the provided id_priv may already be on the bind_list, but
3429 * we still need to check that it's okay to start listening.
3430 */
3431 static int cma_check_port(struct rdma_bind_list *bind_list,
3432 struct rdma_id_private *id_priv, uint8_t reuseaddr)
3433 {
3434 struct rdma_id_private *cur_id;
3435 struct sockaddr *addr, *cur_addr;
3436
3437 addr = cma_src_addr(id_priv);
3438 hlist_for_each_entry(cur_id, &bind_list->owners, node) {
3439 if (id_priv == cur_id)
3440 continue;
3441
3442 if ((cur_id->state != RDMA_CM_LISTEN) && reuseaddr &&
3443 cur_id->reuseaddr)
3444 continue;
3445
3446 cur_addr = cma_src_addr(cur_id);
3447 if (id_priv->afonly && cur_id->afonly &&
3448 (addr->sa_family != cur_addr->sa_family))
3449 continue;
3450
3451 if (cma_any_addr(addr) || cma_any_addr(cur_addr))
3452 return -EADDRNOTAVAIL;
3453
3454 if (!cma_addr_cmp(addr, cur_addr))
3455 return -EADDRINUSE;
3456 }
3457 return 0;
3458 }
3459
3460 static int cma_use_port(enum rdma_ucm_port_space ps,
3461 struct rdma_id_private *id_priv)
3462 {
3463 struct rdma_bind_list *bind_list;
3464 unsigned short snum;
3465 int ret;
3466
3467 snum = ntohs(cma_port(cma_src_addr(id_priv)));
3468 if (snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
3469 return -EACCES;
3470
3471 bind_list = cma_ps_find(id_priv->id.route.addr.dev_addr.net, ps, snum);
3472 if (!bind_list) {
3473 ret = cma_alloc_port(ps, id_priv, snum);
3474 } else {
3475 ret = cma_check_port(bind_list, id_priv, id_priv->reuseaddr);
3476 if (!ret)
3477 cma_bind_port(bind_list, id_priv);
3478 }
3479 return ret;
3480 }
3481
3482 static int cma_bind_listen(struct rdma_id_private *id_priv)
3483 {
3484 struct rdma_bind_list *bind_list = id_priv->bind_list;
3485 int ret = 0;
3486
3487 mutex_lock(&lock);
3488 if (bind_list->owners.first->next)
3489 ret = cma_check_port(bind_list, id_priv, 0);
3490 mutex_unlock(&lock);
3491 return ret;
3492 }
3493
3494 static enum rdma_ucm_port_space
3495 cma_select_inet_ps(struct rdma_id_private *id_priv)
3496 {
3497 switch (id_priv->id.ps) {
3498 case RDMA_PS_TCP:
3499 case RDMA_PS_UDP:
3500 case RDMA_PS_IPOIB:
3501 case RDMA_PS_IB:
3502 return id_priv->id.ps;
3503 default:
3504
3505 return 0;
3506 }
3507 }
3508
3509 static enum rdma_ucm_port_space
3510 cma_select_ib_ps(struct rdma_id_private *id_priv)
3511 {
3512 enum rdma_ucm_port_space ps = 0;
3513 struct sockaddr_ib *sib;
3514 u64 sid_ps, mask, sid;
3515
3516 sib = (struct sockaddr_ib *) cma_src_addr(id_priv);
3517 mask = be64_to_cpu(sib->sib_sid_mask) & RDMA_IB_IP_PS_MASK;
3518 sid = be64_to_cpu(sib->sib_sid) & mask;
3519
3520 if ((id_priv->id.ps == RDMA_PS_IB) && (sid == (RDMA_IB_IP_PS_IB & mask))) {
3521 sid_ps = RDMA_IB_IP_PS_IB;
3522 ps = RDMA_PS_IB;
3523 } else if (((id_priv->id.ps == RDMA_PS_IB) || (id_priv->id.ps == RDMA_PS_TCP)) &&
3524 (sid == (RDMA_IB_IP_PS_TCP & mask))) {
3525 sid_ps = RDMA_IB_IP_PS_TCP;
3526 ps = RDMA_PS_TCP;
3527 } else if (((id_priv->id.ps == RDMA_PS_IB) || (id_priv->id.ps == RDMA_PS_UDP)) &&
3528 (sid == (RDMA_IB_IP_PS_UDP & mask))) {
3529 sid_ps = RDMA_IB_IP_PS_UDP;
3530 ps = RDMA_PS_UDP;
3531 }
3532
3533 if (ps) {
3534 sib->sib_sid = cpu_to_be64(sid_ps | ntohs(cma_port((struct sockaddr *) sib)));
3535 sib->sib_sid_mask = cpu_to_be64(RDMA_IB_IP_PS_MASK |
3536 be64_to_cpu(sib->sib_sid_mask));
3537 }
3538 return ps;
3539 }
3540
3541 static int cma_get_port(struct rdma_id_private *id_priv)
3542 {
3543 enum rdma_ucm_port_space ps;
3544 int ret;
3545
3546 if (cma_family(id_priv) != AF_IB)
3547 ps = cma_select_inet_ps(id_priv);
3548 else
3549 ps = cma_select_ib_ps(id_priv);
3550 if (!ps)
3551 return -EPROTONOSUPPORT;
3552
3553 mutex_lock(&lock);
3554 if (cma_any_port(cma_src_addr(id_priv)))
3555 ret = cma_alloc_any_port(ps, id_priv);
3556 else
3557 ret = cma_use_port(ps, id_priv);
3558 mutex_unlock(&lock);
3559
3560 return ret;
3561 }
3562
3563 static int cma_check_linklocal(struct rdma_dev_addr *dev_addr,
3564 struct sockaddr *addr)
3565 {
3566 #if IS_ENABLED(CONFIG_IPV6)
3567 struct sockaddr_in6 *sin6;
3568
3569 if (addr->sa_family != AF_INET6)
3570 return 0;
3571
3572 sin6 = (struct sockaddr_in6 *) addr;
3573
3574 if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
3575 return 0;
3576
3577 if (!sin6->sin6_scope_id)
3578 return -EINVAL;
3579
3580 dev_addr->bound_dev_if = sin6->sin6_scope_id;
3581 #endif
3582 return 0;
3583 }
3584
3585 int rdma_listen(struct rdma_cm_id *id, int backlog)
3586 {
3587 struct rdma_id_private *id_priv;
3588 int ret;
3589
3590 id_priv = container_of(id, struct rdma_id_private, id);
3591 if (id_priv->state == RDMA_CM_IDLE) {
3592 id->route.addr.src_addr.ss_family = AF_INET;
3593 ret = rdma_bind_addr(id, cma_src_addr(id_priv));
3594 if (ret)
3595 return ret;
3596 }
3597
3598 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_LISTEN))
3599 return -EINVAL;
3600
3601 if (id_priv->reuseaddr) {
3602 ret = cma_bind_listen(id_priv);
3603 if (ret)
3604 goto err;
3605 }
3606
3607 id_priv->backlog = backlog;
3608 if (id->device) {
3609 if (rdma_cap_ib_cm(id->device, 1)) {
3610 ret = cma_ib_listen(id_priv);
3611 if (ret)
3612 goto err;
3613 } else if (rdma_cap_iw_cm(id->device, 1)) {
3614 ret = cma_iw_listen(id_priv, backlog);
3615 if (ret)
3616 goto err;
3617 } else {
3618 ret = -ENOSYS;
3619 goto err;
3620 }
3621 } else
3622 cma_listen_on_all(id_priv);
3623
3624 return 0;
3625 err:
3626 id_priv->backlog = 0;
3627 cma_comp_exch(id_priv, RDMA_CM_LISTEN, RDMA_CM_ADDR_BOUND);
3628 return ret;
3629 }
3630 EXPORT_SYMBOL(rdma_listen);
3631
3632 int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr)
3633 {
3634 struct rdma_id_private *id_priv;
3635 int ret;
3636 struct sockaddr *daddr;
3637
3638 if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6 &&
3639 addr->sa_family != AF_IB)
3640 return -EAFNOSUPPORT;
3641
3642 id_priv = container_of(id, struct rdma_id_private, id);
3643 if (!cma_comp_exch(id_priv, RDMA_CM_IDLE, RDMA_CM_ADDR_BOUND))
3644 return -EINVAL;
3645
3646 ret = cma_check_linklocal(&id->route.addr.dev_addr, addr);
3647 if (ret)
3648 goto err1;
3649
3650 memcpy(cma_src_addr(id_priv), addr, rdma_addr_size(addr));
3651 if (!cma_any_addr(addr)) {
3652 ret = cma_translate_addr(addr, &id->route.addr.dev_addr);
3653 if (ret)
3654 goto err1;
3655
3656 ret = cma_acquire_dev_by_src_ip(id_priv);
3657 if (ret)
3658 goto err1;
3659 }
3660
3661 if (!(id_priv->options & (1 << CMA_OPTION_AFONLY))) {
3662 if (addr->sa_family == AF_INET)
3663 id_priv->afonly = 1;
3664 #if IS_ENABLED(CONFIG_IPV6)
3665 else if (addr->sa_family == AF_INET6) {
3666 struct net *net = id_priv->id.route.addr.dev_addr.net;
3667
3668 id_priv->afonly = net->ipv6.sysctl.bindv6only;
3669 }
3670 #endif
3671 }
3672 daddr = cma_dst_addr(id_priv);
3673 daddr->sa_family = addr->sa_family;
3674
3675 ret = cma_get_port(id_priv);
3676 if (ret)
3677 goto err2;
3678
3679 return 0;
3680 err2:
3681 rdma_restrack_del(&id_priv->res);
3682 if (id_priv->cma_dev)
3683 cma_release_dev(id_priv);
3684 err1:
3685 cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_IDLE);
3686 return ret;
3687 }
3688 EXPORT_SYMBOL(rdma_bind_addr);
3689
3690 static int cma_format_hdr(void *hdr, struct rdma_id_private *id_priv)
3691 {
3692 struct cma_hdr *cma_hdr;
3693
3694 cma_hdr = hdr;
3695 cma_hdr->cma_version = CMA_VERSION;
3696 if (cma_family(id_priv) == AF_INET) {
3697 struct sockaddr_in *src4, *dst4;
3698
3699 src4 = (struct sockaddr_in *) cma_src_addr(id_priv);
3700 dst4 = (struct sockaddr_in *) cma_dst_addr(id_priv);
3701
3702 cma_set_ip_ver(cma_hdr, 4);
3703 cma_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
3704 cma_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
3705 cma_hdr->port = src4->sin_port;
3706 } else if (cma_family(id_priv) == AF_INET6) {
3707 struct sockaddr_in6 *src6, *dst6;
3708
3709 src6 = (struct sockaddr_in6 *) cma_src_addr(id_priv);
3710 dst6 = (struct sockaddr_in6 *) cma_dst_addr(id_priv);
3711
3712 cma_set_ip_ver(cma_hdr, 6);
3713 cma_hdr->src_addr.ip6 = src6->sin6_addr;
3714 cma_hdr->dst_addr.ip6 = dst6->sin6_addr;
3715 cma_hdr->port = src6->sin6_port;
3716 }
3717 return 0;
3718 }
3719
3720 static int cma_sidr_rep_handler(struct ib_cm_id *cm_id,
3721 const struct ib_cm_event *ib_event)
3722 {
3723 struct rdma_id_private *id_priv = cm_id->context;
3724 struct rdma_cm_event event = {};
3725 const struct ib_cm_sidr_rep_event_param *rep =
3726 &ib_event->param.sidr_rep_rcvd;
3727 int ret = 0;
3728
3729 mutex_lock(&id_priv->handler_mutex);
3730 if (id_priv->state != RDMA_CM_CONNECT)
3731 goto out;
3732
3733 switch (ib_event->event) {
3734 case IB_CM_SIDR_REQ_ERROR:
3735 event.event = RDMA_CM_EVENT_UNREACHABLE;
3736 event.status = -ETIMEDOUT;
3737 break;
3738 case IB_CM_SIDR_REP_RECEIVED:
3739 event.param.ud.private_data = ib_event->private_data;
3740 event.param.ud.private_data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
3741 if (rep->status != IB_SIDR_SUCCESS) {
3742 event.event = RDMA_CM_EVENT_UNREACHABLE;
3743 event.status = ib_event->param.sidr_rep_rcvd.status;
3744 pr_debug_ratelimited("RDMA CM: UNREACHABLE: bad SIDR reply. status %d\n",
3745 event.status);
3746 break;
3747 }
3748 ret = cma_set_qkey(id_priv, rep->qkey);
3749 if (ret) {
3750 pr_debug_ratelimited("RDMA CM: ADDR_ERROR: failed to set qkey. status %d\n", ret);
3751 event.event = RDMA_CM_EVENT_ADDR_ERROR;
3752 event.status = ret;
3753 break;
3754 }
3755 ib_init_ah_attr_from_path(id_priv->id.device,
3756 id_priv->id.port_num,
3757 id_priv->id.route.path_rec,
3758 &event.param.ud.ah_attr,
3759 rep->sgid_attr);
3760 event.param.ud.qp_num = rep->qpn;
3761 event.param.ud.qkey = rep->qkey;
3762 event.event = RDMA_CM_EVENT_ESTABLISHED;
3763 event.status = 0;
3764 break;
3765 default:
3766 pr_err("RDMA CMA: unexpected IB CM event: %d\n",
3767 ib_event->event);
3768 goto out;
3769 }
3770
3771 ret = cma_cm_event_handler(id_priv, &event);
3772
3773 rdma_destroy_ah_attr(&event.param.ud.ah_attr);
3774 if (ret) {
3775 /* Destroy the CM ID by returning a non-zero value. */
3776 id_priv->cm_id.ib = NULL;
3777 cma_exch(id_priv, RDMA_CM_DESTROYING);
3778 mutex_unlock(&id_priv->handler_mutex);
3779 rdma_destroy_id(&id_priv->id);
3780 return ret;
3781 }
3782 out:
3783 mutex_unlock(&id_priv->handler_mutex);
3784 return ret;
3785 }
3786
3787 static int cma_resolve_ib_udp(struct rdma_id_private *id_priv,
3788 struct rdma_conn_param *conn_param)
3789 {
3790 struct ib_cm_sidr_req_param req;
3791 struct ib_cm_id *id;
3792 void *private_data;
3793 u8 offset;
3794 int ret;
3795
3796 memset(&req, 0, sizeof req);
3797 offset = cma_user_data_offset(id_priv);
3798 req.private_data_len = offset + conn_param->private_data_len;
3799 if (req.private_data_len < conn_param->private_data_len)
3800 return -EINVAL;
3801
3802 if (req.private_data_len) {
3803 private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
3804 if (!private_data)
3805 return -ENOMEM;
3806 } else {
3807 private_data = NULL;
3808 }
3809
3810 if (conn_param->private_data && conn_param->private_data_len)
3811 memcpy(private_data + offset, conn_param->private_data,
3812 conn_param->private_data_len);
3813
3814 if (private_data) {
3815 ret = cma_format_hdr(private_data, id_priv);
3816 if (ret)
3817 goto out;
3818 req.private_data = private_data;
3819 }
3820
3821 id = ib_create_cm_id(id_priv->id.device, cma_sidr_rep_handler,
3822 id_priv);
3823 if (IS_ERR(id)) {
3824 ret = PTR_ERR(id);
3825 goto out;
3826 }
3827 id_priv->cm_id.ib = id;
3828
3829 req.path = id_priv->id.route.path_rec;
3830 req.sgid_attr = id_priv->id.route.addr.dev_addr.sgid_attr;
3831 req.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
3832 req.timeout_ms = 1 << (CMA_CM_RESPONSE_TIMEOUT - 8);
3833 req.max_cm_retries = CMA_MAX_CM_RETRIES;
3834
3835 trace_cm_send_sidr_req(id_priv);
3836 ret = ib_send_cm_sidr_req(id_priv->cm_id.ib, &req);
3837 if (ret) {
3838 ib_destroy_cm_id(id_priv->cm_id.ib);
3839 id_priv->cm_id.ib = NULL;
3840 }
3841 out:
3842 kfree(private_data);
3843 return ret;
3844 }
3845
3846 static int cma_connect_ib(struct rdma_id_private *id_priv,
3847 struct rdma_conn_param *conn_param)
3848 {
3849 struct ib_cm_req_param req;
3850 struct rdma_route *route;
3851 void *private_data;
3852 struct ib_cm_id *id;
3853 u8 offset;
3854 int ret;
3855
3856 memset(&req, 0, sizeof req);
3857 offset = cma_user_data_offset(id_priv);
3858 req.private_data_len = offset + conn_param->private_data_len;
3859 if (req.private_data_len < conn_param->private_data_len)
3860 return -EINVAL;
3861
3862 if (req.private_data_len) {
3863 private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
3864 if (!private_data)
3865 return -ENOMEM;
3866 } else {
3867 private_data = NULL;
3868 }
3869
3870 if (conn_param->private_data && conn_param->private_data_len)
3871 memcpy(private_data + offset, conn_param->private_data,
3872 conn_param->private_data_len);
3873
3874 id = ib_create_cm_id(id_priv->id.device, cma_ib_handler, id_priv);
3875 if (IS_ERR(id)) {
3876 ret = PTR_ERR(id);
3877 goto out;
3878 }
3879 id_priv->cm_id.ib = id;
3880
3881 route = &id_priv->id.route;
3882 if (private_data) {
3883 ret = cma_format_hdr(private_data, id_priv);
3884 if (ret)
3885 goto out;
3886 req.private_data = private_data;
3887 }
3888
3889 req.primary_path = &route->path_rec[0];
3890 if (route->num_paths == 2)
3891 req.alternate_path = &route->path_rec[1];
3892
3893 req.ppath_sgid_attr = id_priv->id.route.addr.dev_addr.sgid_attr;
3894 /* Alternate path SGID attribute currently unsupported */
3895 req.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
3896 req.qp_num = id_priv->qp_num;
3897 req.qp_type = id_priv->id.qp_type;
3898 req.starting_psn = id_priv->seq_num;
3899 req.responder_resources = conn_param->responder_resources;
3900 req.initiator_depth = conn_param->initiator_depth;
3901 req.flow_control = conn_param->flow_control;
3902 req.retry_count = min_t(u8, 7, conn_param->retry_count);
3903 req.rnr_retry_count = min_t(u8, 7, conn_param->rnr_retry_count);
3904 req.remote_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
3905 req.local_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
3906 req.max_cm_retries = CMA_MAX_CM_RETRIES;
3907 req.srq = id_priv->srq ? 1 : 0;
3908
3909 trace_cm_send_req(id_priv);
3910 ret = ib_send_cm_req(id_priv->cm_id.ib, &req);
3911 out:
3912 if (ret && !IS_ERR(id)) {
3913 ib_destroy_cm_id(id);
3914 id_priv->cm_id.ib = NULL;
3915 }
3916
3917 kfree(private_data);
3918 return ret;
3919 }
3920
3921 static int cma_connect_iw(struct rdma_id_private *id_priv,
3922 struct rdma_conn_param *conn_param)
3923 {
3924 struct iw_cm_id *cm_id;
3925 int ret;
3926 struct iw_cm_conn_param iw_param;
3927
3928 cm_id = iw_create_cm_id(id_priv->id.device, cma_iw_handler, id_priv);
3929 if (IS_ERR(cm_id))
3930 return PTR_ERR(cm_id);
3931
3932 cm_id->tos = id_priv->tos;
3933 cm_id->tos_set = id_priv->tos_set;
3934 id_priv->cm_id.iw = cm_id;
3935
3936 memcpy(&cm_id->local_addr, cma_src_addr(id_priv),
3937 rdma_addr_size(cma_src_addr(id_priv)));
3938 memcpy(&cm_id->remote_addr, cma_dst_addr(id_priv),
3939 rdma_addr_size(cma_dst_addr(id_priv)));
3940
3941 ret = cma_modify_qp_rtr(id_priv, conn_param);
3942 if (ret)
3943 goto out;
3944
3945 if (conn_param) {
3946 iw_param.ord = conn_param->initiator_depth;
3947 iw_param.ird = conn_param->responder_resources;
3948 iw_param.private_data = conn_param->private_data;
3949 iw_param.private_data_len = conn_param->private_data_len;
3950 iw_param.qpn = id_priv->id.qp ? id_priv->qp_num : conn_param->qp_num;
3951 } else {
3952 memset(&iw_param, 0, sizeof iw_param);
3953 iw_param.qpn = id_priv->qp_num;
3954 }
3955 ret = iw_cm_connect(cm_id, &iw_param);
3956 out:
3957 if (ret) {
3958 iw_destroy_cm_id(cm_id);
3959 id_priv->cm_id.iw = NULL;
3960 }
3961 return ret;
3962 }
3963
3964 int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
3965 {
3966 struct rdma_id_private *id_priv;
3967 int ret;
3968
3969 id_priv = container_of(id, struct rdma_id_private, id);
3970 if (!cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_CONNECT))
3971 return -EINVAL;
3972
3973 if (!id->qp) {
3974 id_priv->qp_num = conn_param->qp_num;
3975 id_priv->srq = conn_param->srq;
3976 }
3977
3978 if (rdma_cap_ib_cm(id->device, id->port_num)) {
3979 if (id->qp_type == IB_QPT_UD)
3980 ret = cma_resolve_ib_udp(id_priv, conn_param);
3981 else
3982 ret = cma_connect_ib(id_priv, conn_param);
3983 } else if (rdma_cap_iw_cm(id->device, id->port_num))
3984 ret = cma_connect_iw(id_priv, conn_param);
3985 else
3986 ret = -ENOSYS;
3987 if (ret)
3988 goto err;
3989
3990 return 0;
3991 err:
3992 cma_comp_exch(id_priv, RDMA_CM_CONNECT, RDMA_CM_ROUTE_RESOLVED);
3993 return ret;
3994 }
3995 EXPORT_SYMBOL(rdma_connect);
3996
3997 static int cma_accept_ib(struct rdma_id_private *id_priv,
3998 struct rdma_conn_param *conn_param)
3999 {
4000 struct ib_cm_rep_param rep;
4001 int ret;
4002
4003 ret = cma_modify_qp_rtr(id_priv, conn_param);
4004 if (ret)
4005 goto out;
4006
4007 ret = cma_modify_qp_rts(id_priv, conn_param);
4008 if (ret)
4009 goto out;
4010
4011 memset(&rep, 0, sizeof rep);
4012 rep.qp_num = id_priv->qp_num;
4013 rep.starting_psn = id_priv->seq_num;
4014 rep.private_data = conn_param->private_data;
4015 rep.private_data_len = conn_param->private_data_len;
4016 rep.responder_resources = conn_param->responder_resources;
4017 rep.initiator_depth = conn_param->initiator_depth;
4018 rep.failover_accepted = 0;
4019 rep.flow_control = conn_param->flow_control;
4020 rep.rnr_retry_count = min_t(u8, 7, conn_param->rnr_retry_count);
4021 rep.srq = id_priv->srq ? 1 : 0;
4022
4023 trace_cm_send_rep(id_priv);
4024 ret = ib_send_cm_rep(id_priv->cm_id.ib, &rep);
4025 out:
4026 return ret;
4027 }
4028
4029 static int cma_accept_iw(struct rdma_id_private *id_priv,
4030 struct rdma_conn_param *conn_param)
4031 {
4032 struct iw_cm_conn_param iw_param;
4033 int ret;
4034
4035 if (!conn_param)
4036 return -EINVAL;
4037
4038 ret = cma_modify_qp_rtr(id_priv, conn_param);
4039 if (ret)
4040 return ret;
4041
4042 iw_param.ord = conn_param->initiator_depth;
4043 iw_param.ird = conn_param->responder_resources;
4044 iw_param.private_data = conn_param->private_data;
4045 iw_param.private_data_len = conn_param->private_data_len;
4046 if (id_priv->id.qp) {
4047 iw_param.qpn = id_priv->qp_num;
4048 } else
4049 iw_param.qpn = conn_param->qp_num;
4050
4051 return iw_cm_accept(id_priv->cm_id.iw, &iw_param);
4052 }
4053
4054 static int cma_send_sidr_rep(struct rdma_id_private *id_priv,
4055 enum ib_cm_sidr_status status, u32 qkey,
4056 const void *private_data, int private_data_len)
4057 {
4058 struct ib_cm_sidr_rep_param rep;
4059 int ret;
4060
4061 memset(&rep, 0, sizeof rep);
4062 rep.status = status;
4063 if (status == IB_SIDR_SUCCESS) {
4064 ret = cma_set_qkey(id_priv, qkey);
4065 if (ret)
4066 return ret;
4067 rep.qp_num = id_priv->qp_num;
4068 rep.qkey = id_priv->qkey;
4069 }
4070 rep.private_data = private_data;
4071 rep.private_data_len = private_data_len;
4072
4073 trace_cm_send_sidr_rep(id_priv);
4074 return ib_send_cm_sidr_rep(id_priv->cm_id.ib, &rep);
4075 }
4076
4077 int __rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param,
4078 const char *caller)
4079 {
4080 struct rdma_id_private *id_priv;
4081 int ret;
4082
4083 id_priv = container_of(id, struct rdma_id_private, id);
4084
4085 rdma_restrack_set_task(&id_priv->res, caller);
4086
4087 if (!cma_comp(id_priv, RDMA_CM_CONNECT))
4088 return -EINVAL;
4089
4090 if (!id->qp && conn_param) {
4091 id_priv->qp_num = conn_param->qp_num;
4092 id_priv->srq = conn_param->srq;
4093 }
4094
4095 if (rdma_cap_ib_cm(id->device, id->port_num)) {
4096 if (id->qp_type == IB_QPT_UD) {
4097 if (conn_param)
4098 ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
4099 conn_param->qkey,
4100 conn_param->private_data,
4101 conn_param->private_data_len);
4102 else
4103 ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
4104 0, NULL, 0);
4105 } else {
4106 if (conn_param)
4107 ret = cma_accept_ib(id_priv, conn_param);
4108 else
4109 ret = cma_rep_recv(id_priv);
4110 }
4111 } else if (rdma_cap_iw_cm(id->device, id->port_num))
4112 ret = cma_accept_iw(id_priv, conn_param);
4113 else
4114 ret = -ENOSYS;
4115
4116 if (ret)
4117 goto reject;
4118
4119 return 0;
4120 reject:
4121 cma_modify_qp_err(id_priv);
4122 rdma_reject(id, NULL, 0);
4123 return ret;
4124 }
4125 EXPORT_SYMBOL(__rdma_accept);
4126
4127 int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event)
4128 {
4129 struct rdma_id_private *id_priv;
4130 int ret;
4131
4132 id_priv = container_of(id, struct rdma_id_private, id);
4133 if (!id_priv->cm_id.ib)
4134 return -EINVAL;
4135
4136 switch (id->device->node_type) {
4137 case RDMA_NODE_IB_CA:
4138 ret = ib_cm_notify(id_priv->cm_id.ib, event);
4139 break;
4140 default:
4141 ret = 0;
4142 break;
4143 }
4144 return ret;
4145 }
4146 EXPORT_SYMBOL(rdma_notify);
4147
4148 int rdma_reject(struct rdma_cm_id *id, const void *private_data,
4149 u8 private_data_len)
4150 {
4151 struct rdma_id_private *id_priv;
4152 int ret;
4153
4154 id_priv = container_of(id, struct rdma_id_private, id);
4155 if (!id_priv->cm_id.ib)
4156 return -EINVAL;
4157
4158 if (rdma_cap_ib_cm(id->device, id->port_num)) {
4159 if (id->qp_type == IB_QPT_UD) {
4160 ret = cma_send_sidr_rep(id_priv, IB_SIDR_REJECT, 0,
4161 private_data, private_data_len);
4162 } else {
4163 trace_cm_send_rej(id_priv);
4164 ret = ib_send_cm_rej(id_priv->cm_id.ib,
4165 IB_CM_REJ_CONSUMER_DEFINED, NULL,
4166 0, private_data, private_data_len);
4167 }
4168 } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
4169 ret = iw_cm_reject(id_priv->cm_id.iw,
4170 private_data, private_data_len);
4171 } else
4172 ret = -ENOSYS;
4173
4174 return ret;
4175 }
4176 EXPORT_SYMBOL(rdma_reject);
4177
4178 int rdma_disconnect(struct rdma_cm_id *id)
4179 {
4180 struct rdma_id_private *id_priv;
4181 int ret;
4182
4183 id_priv = container_of(id, struct rdma_id_private, id);
4184 if (!id_priv->cm_id.ib)
4185 return -EINVAL;
4186
4187 if (rdma_cap_ib_cm(id->device, id->port_num)) {
4188 ret = cma_modify_qp_err(id_priv);
4189 if (ret)
4190 goto out;
4191 /* Initiate or respond to a disconnect. */
4192 trace_cm_disconnect(id_priv);
4193 if (ib_send_cm_dreq(id_priv->cm_id.ib, NULL, 0)) {
4194 if (!ib_send_cm_drep(id_priv->cm_id.ib, NULL, 0))
4195 trace_cm_sent_drep(id_priv);
4196 } else {
4197 trace_cm_sent_dreq(id_priv);
4198 }
4199 } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
4200 ret = iw_cm_disconnect(id_priv->cm_id.iw, 0);
4201 } else
4202 ret = -EINVAL;
4203
4204 out:
4205 return ret;
4206 }
4207 EXPORT_SYMBOL(rdma_disconnect);
4208
4209 static int cma_ib_mc_handler(int status, struct ib_sa_multicast *multicast)
4210 {
4211 struct rdma_id_private *id_priv;
4212 struct cma_multicast *mc = multicast->context;
4213 struct rdma_cm_event event = {};
4214 int ret = 0;
4215
4216 id_priv = mc->id_priv;
4217 mutex_lock(&id_priv->handler_mutex);
4218 if (id_priv->state != RDMA_CM_ADDR_BOUND &&
4219 id_priv->state != RDMA_CM_ADDR_RESOLVED)
4220 goto out;
4221
4222 if (!status)
4223 status = cma_set_qkey(id_priv, be32_to_cpu(multicast->rec.qkey));
4224 else
4225 pr_debug_ratelimited("RDMA CM: MULTICAST_ERROR: failed to join multicast. status %d\n",
4226 status);
4227 mutex_lock(&id_priv->qp_mutex);
4228 if (!status && id_priv->id.qp) {
4229 status = ib_attach_mcast(id_priv->id.qp, &multicast->rec.mgid,
4230 be16_to_cpu(multicast->rec.mlid));
4231 if (status)
4232 pr_debug_ratelimited("RDMA CM: MULTICAST_ERROR: failed to attach QP. status %d\n",
4233 status);
4234 }
4235 mutex_unlock(&id_priv->qp_mutex);
4236
4237 event.status = status;
4238 event.param.ud.private_data = mc->context;
4239 if (!status) {
4240 struct rdma_dev_addr *dev_addr =
4241 &id_priv->id.route.addr.dev_addr;
4242 struct net_device *ndev =
4243 dev_get_by_index(dev_addr->net, dev_addr->bound_dev_if);
4244 enum ib_gid_type gid_type =
4245 id_priv->cma_dev->default_gid_type[id_priv->id.port_num -
4246 rdma_start_port(id_priv->cma_dev->device)];
4247
4248 event.event = RDMA_CM_EVENT_MULTICAST_JOIN;
4249 ret = ib_init_ah_from_mcmember(id_priv->id.device,
4250 id_priv->id.port_num,
4251 &multicast->rec,
4252 ndev, gid_type,
4253 &event.param.ud.ah_attr);
4254 if (ret)
4255 event.event = RDMA_CM_EVENT_MULTICAST_ERROR;
4256
4257 event.param.ud.qp_num = 0xFFFFFF;
4258 event.param.ud.qkey = be32_to_cpu(multicast->rec.qkey);
4259 if (ndev)
4260 dev_put(ndev);
4261 } else
4262 event.event = RDMA_CM_EVENT_MULTICAST_ERROR;
4263
4264 ret = cma_cm_event_handler(id_priv, &event);
4265
4266 rdma_destroy_ah_attr(&event.param.ud.ah_attr);
4267 if (ret) {
4268 cma_exch(id_priv, RDMA_CM_DESTROYING);
4269 mutex_unlock(&id_priv->handler_mutex);
4270 rdma_destroy_id(&id_priv->id);
4271 return 0;
4272 }
4273
4274 out:
4275 mutex_unlock(&id_priv->handler_mutex);
4276 return 0;
4277 }
4278
4279 static void cma_set_mgid(struct rdma_id_private *id_priv,
4280 struct sockaddr *addr, union ib_gid *mgid)
4281 {
4282 unsigned char mc_map[MAX_ADDR_LEN];
4283 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
4284 struct sockaddr_in *sin = (struct sockaddr_in *) addr;
4285 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) addr;
4286
4287 if (cma_any_addr(addr)) {
4288 memset(mgid, 0, sizeof *mgid);
4289 } else if ((addr->sa_family == AF_INET6) &&
4290 ((be32_to_cpu(sin6->sin6_addr.s6_addr32[0]) & 0xFFF0FFFF) ==
4291 0xFF10A01B)) {
4292 /* IPv6 address is an SA assigned MGID. */
4293 memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
4294 } else if (addr->sa_family == AF_IB) {
4295 memcpy(mgid, &((struct sockaddr_ib *) addr)->sib_addr, sizeof *mgid);
4296 } else if (addr->sa_family == AF_INET6) {
4297 ipv6_ib_mc_map(&sin6->sin6_addr, dev_addr->broadcast, mc_map);
4298 if (id_priv->id.ps == RDMA_PS_UDP)
4299 mc_map[7] = 0x01; /* Use RDMA CM signature */
4300 *mgid = *(union ib_gid *) (mc_map + 4);
4301 } else {
4302 ip_ib_mc_map(sin->sin_addr.s_addr, dev_addr->broadcast, mc_map);
4303 if (id_priv->id.ps == RDMA_PS_UDP)
4304 mc_map[7] = 0x01; /* Use RDMA CM signature */
4305 *mgid = *(union ib_gid *) (mc_map + 4);
4306 }
4307 }
4308
4309 static int cma_join_ib_multicast(struct rdma_id_private *id_priv,
4310 struct cma_multicast *mc)
4311 {
4312 struct ib_sa_mcmember_rec rec;
4313 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
4314 ib_sa_comp_mask comp_mask;
4315 int ret;
4316
4317 ib_addr_get_mgid(dev_addr, &rec.mgid);
4318 ret = ib_sa_get_mcmember_rec(id_priv->id.device, id_priv->id.port_num,
4319 &rec.mgid, &rec);
4320 if (ret)
4321 return ret;
4322
4323 ret = cma_set_qkey(id_priv, 0);
4324 if (ret)
4325 return ret;
4326
4327 cma_set_mgid(id_priv, (struct sockaddr *) &mc->addr, &rec.mgid);
4328 rec.qkey = cpu_to_be32(id_priv->qkey);
4329 rdma_addr_get_sgid(dev_addr, &rec.port_gid);
4330 rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
4331 rec.join_state = mc->join_state;
4332
4333 if ((rec.join_state == BIT(SENDONLY_FULLMEMBER_JOIN)) &&
4334 (!ib_sa_sendonly_fullmem_support(&sa_client,
4335 id_priv->id.device,
4336 id_priv->id.port_num))) {
4337 dev_warn(
4338 &id_priv->id.device->dev,
4339 "RDMA CM: port %u Unable to multicast join: SM doesn't support Send Only Full Member option\n",
4340 id_priv->id.port_num);
4341 return -EOPNOTSUPP;
4342 }
4343
4344 comp_mask = IB_SA_MCMEMBER_REC_MGID | IB_SA_MCMEMBER_REC_PORT_GID |
4345 IB_SA_MCMEMBER_REC_PKEY | IB_SA_MCMEMBER_REC_JOIN_STATE |
4346 IB_SA_MCMEMBER_REC_QKEY | IB_SA_MCMEMBER_REC_SL |
4347 IB_SA_MCMEMBER_REC_FLOW_LABEL |
4348 IB_SA_MCMEMBER_REC_TRAFFIC_CLASS;
4349
4350 if (id_priv->id.ps == RDMA_PS_IPOIB)
4351 comp_mask |= IB_SA_MCMEMBER_REC_RATE |
4352 IB_SA_MCMEMBER_REC_RATE_SELECTOR |
4353 IB_SA_MCMEMBER_REC_MTU_SELECTOR |
4354 IB_SA_MCMEMBER_REC_MTU |
4355 IB_SA_MCMEMBER_REC_HOP_LIMIT;
4356
4357 mc->multicast.ib = ib_sa_join_multicast(&sa_client, id_priv->id.device,
4358 id_priv->id.port_num, &rec,
4359 comp_mask, GFP_KERNEL,
4360 cma_ib_mc_handler, mc);
4361 return PTR_ERR_OR_ZERO(mc->multicast.ib);
4362 }
4363
4364 static void iboe_mcast_work_handler(struct work_struct *work)
4365 {
4366 struct iboe_mcast_work *mw = container_of(work, struct iboe_mcast_work, work);
4367 struct cma_multicast *mc = mw->mc;
4368 struct ib_sa_multicast *m = mc->multicast.ib;
4369
4370 mc->multicast.ib->context = mc;
4371 cma_ib_mc_handler(0, m);
4372 kref_put(&mc->mcref, release_mc);
4373 kfree(mw);
4374 }
4375
4376 static void cma_iboe_set_mgid(struct sockaddr *addr, union ib_gid *mgid,
4377 enum ib_gid_type gid_type)
4378 {
4379 struct sockaddr_in *sin = (struct sockaddr_in *)addr;
4380 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr;
4381
4382 if (cma_any_addr(addr)) {
4383 memset(mgid, 0, sizeof *mgid);
4384 } else if (addr->sa_family == AF_INET6) {
4385 memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
4386 } else {
4387 mgid->raw[0] =
4388 (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) ? 0 : 0xff;
4389 mgid->raw[1] =
4390 (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) ? 0 : 0x0e;
4391 mgid->raw[2] = 0;
4392 mgid->raw[3] = 0;
4393 mgid->raw[4] = 0;
4394 mgid->raw[5] = 0;
4395 mgid->raw[6] = 0;
4396 mgid->raw[7] = 0;
4397 mgid->raw[8] = 0;
4398 mgid->raw[9] = 0;
4399 mgid->raw[10] = 0xff;
4400 mgid->raw[11] = 0xff;
4401 *(__be32 *)(&mgid->raw[12]) = sin->sin_addr.s_addr;
4402 }
4403 }
4404
4405 static int cma_iboe_join_multicast(struct rdma_id_private *id_priv,
4406 struct cma_multicast *mc)
4407 {
4408 struct iboe_mcast_work *work;
4409 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
4410 int err = 0;
4411 struct sockaddr *addr = (struct sockaddr *)&mc->addr;
4412 struct net_device *ndev = NULL;
4413 enum ib_gid_type gid_type;
4414 bool send_only;
4415
4416 send_only = mc->join_state == BIT(SENDONLY_FULLMEMBER_JOIN);
4417
4418 if (cma_zero_addr((struct sockaddr *)&mc->addr))
4419 return -EINVAL;
4420
4421 work = kzalloc(sizeof *work, GFP_KERNEL);
4422 if (!work)
4423 return -ENOMEM;
4424
4425 mc->multicast.ib = kzalloc(sizeof(struct ib_sa_multicast), GFP_KERNEL);
4426 if (!mc->multicast.ib) {
4427 err = -ENOMEM;
4428 goto out1;
4429 }
4430
4431 gid_type = id_priv->cma_dev->default_gid_type[id_priv->id.port_num -
4432 rdma_start_port(id_priv->cma_dev->device)];
4433 cma_iboe_set_mgid(addr, &mc->multicast.ib->rec.mgid, gid_type);
4434
4435 mc->multicast.ib->rec.pkey = cpu_to_be16(0xffff);
4436 if (id_priv->id.ps == RDMA_PS_UDP)
4437 mc->multicast.ib->rec.qkey = cpu_to_be32(RDMA_UDP_QKEY);
4438
4439 if (dev_addr->bound_dev_if)
4440 ndev = dev_get_by_index(dev_addr->net, dev_addr->bound_dev_if);
4441 if (!ndev) {
4442 err = -ENODEV;
4443 goto out2;
4444 }
4445 mc->multicast.ib->rec.rate = iboe_get_rate(ndev);
4446 mc->multicast.ib->rec.hop_limit = 1;
4447 mc->multicast.ib->rec.mtu = iboe_get_mtu(ndev->mtu);
4448
4449 if (addr->sa_family == AF_INET) {
4450 if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) {
4451 mc->multicast.ib->rec.hop_limit = IPV6_DEFAULT_HOPLIMIT;
4452 if (!send_only) {
4453 err = cma_igmp_send(ndev, &mc->multicast.ib->rec.mgid,
4454 true);
4455 }
4456 }
4457 } else {
4458 if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP)
4459 err = -ENOTSUPP;
4460 }
4461 dev_put(ndev);
4462 if (err || !mc->multicast.ib->rec.mtu) {
4463 if (!err)
4464 err = -EINVAL;
4465 goto out2;
4466 }
4467 rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
4468 &mc->multicast.ib->rec.port_gid);
4469 work->id = id_priv;
4470 work->mc = mc;
4471 INIT_WORK(&work->work, iboe_mcast_work_handler);
4472 kref_get(&mc->mcref);
4473 queue_work(cma_wq, &work->work);
4474
4475 return 0;
4476
4477 out2:
4478 kfree(mc->multicast.ib);
4479 out1:
4480 kfree(work);
4481 return err;
4482 }
4483
4484 int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
4485 u8 join_state, void *context)
4486 {
4487 struct rdma_id_private *id_priv;
4488 struct cma_multicast *mc;
4489 int ret;
4490
4491 if (!id->device)
4492 return -EINVAL;
4493
4494 id_priv = container_of(id, struct rdma_id_private, id);
4495 if (!cma_comp(id_priv, RDMA_CM_ADDR_BOUND) &&
4496 !cma_comp(id_priv, RDMA_CM_ADDR_RESOLVED))
4497 return -EINVAL;
4498
4499 mc = kmalloc(sizeof *mc, GFP_KERNEL);
4500 if (!mc)
4501 return -ENOMEM;
4502
4503 memcpy(&mc->addr, addr, rdma_addr_size(addr));
4504 mc->context = context;
4505 mc->id_priv = id_priv;
4506 mc->join_state = join_state;
4507
4508 if (rdma_protocol_roce(id->device, id->port_num)) {
4509 kref_init(&mc->mcref);
4510 ret = cma_iboe_join_multicast(id_priv, mc);
4511 if (ret)
4512 goto out_err;
4513 } else if (rdma_cap_ib_mcast(id->device, id->port_num)) {
4514 ret = cma_join_ib_multicast(id_priv, mc);
4515 if (ret)
4516 goto out_err;
4517 } else {
4518 ret = -ENOSYS;
4519 goto out_err;
4520 }
4521
4522 spin_lock(&id_priv->lock);
4523 list_add(&mc->list, &id_priv->mc_list);
4524 spin_unlock(&id_priv->lock);
4525
4526 return 0;
4527 out_err:
4528 kfree(mc);
4529 return ret;
4530 }
4531 EXPORT_SYMBOL(rdma_join_multicast);
4532
4533 void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr)
4534 {
4535 struct rdma_id_private *id_priv;
4536 struct cma_multicast *mc;
4537
4538 id_priv = container_of(id, struct rdma_id_private, id);
4539 spin_lock_irq(&id_priv->lock);
4540 list_for_each_entry(mc, &id_priv->mc_list, list) {
4541 if (!memcmp(&mc->addr, addr, rdma_addr_size(addr))) {
4542 list_del(&mc->list);
4543 spin_unlock_irq(&id_priv->lock);
4544
4545 if (id->qp)
4546 ib_detach_mcast(id->qp,
4547 &mc->multicast.ib->rec.mgid,
4548 be16_to_cpu(mc->multicast.ib->rec.mlid));
4549
4550 BUG_ON(id_priv->cma_dev->device != id->device);
4551
4552 if (rdma_cap_ib_mcast(id->device, id->port_num)) {
4553 ib_sa_free_multicast(mc->multicast.ib);
4554 kfree(mc);
4555 } else if (rdma_protocol_roce(id->device, id->port_num)) {
4556 cma_leave_roce_mc_group(id_priv, mc);
4557 }
4558 return;
4559 }
4560 }
4561 spin_unlock_irq(&id_priv->lock);
4562 }
4563 EXPORT_SYMBOL(rdma_leave_multicast);
4564
4565 static int cma_netdev_change(struct net_device *ndev, struct rdma_id_private *id_priv)
4566 {
4567 struct rdma_dev_addr *dev_addr;
4568 struct cma_ndev_work *work;
4569
4570 dev_addr = &id_priv->id.route.addr.dev_addr;
4571
4572 if ((dev_addr->bound_dev_if == ndev->ifindex) &&
4573 (net_eq(dev_net(ndev), dev_addr->net)) &&
4574 memcmp(dev_addr->src_dev_addr, ndev->dev_addr, ndev->addr_len)) {
4575 pr_info("RDMA CM addr change for ndev %s used by id %p\n",
4576 ndev->name, &id_priv->id);
4577 work = kzalloc(sizeof *work, GFP_KERNEL);
4578 if (!work)
4579 return -ENOMEM;
4580
4581 INIT_WORK(&work->work, cma_ndev_work_handler);
4582 work->id = id_priv;
4583 work->event.event = RDMA_CM_EVENT_ADDR_CHANGE;
4584 atomic_inc(&id_priv->refcount);
4585 queue_work(cma_wq, &work->work);
4586 }
4587
4588 return 0;
4589 }
4590
4591 static int cma_netdev_callback(struct notifier_block *self, unsigned long event,
4592 void *ptr)
4593 {
4594 struct net_device *ndev = netdev_notifier_info_to_dev(ptr);
4595 struct cma_device *cma_dev;
4596 struct rdma_id_private *id_priv;
4597 int ret = NOTIFY_DONE;
4598
4599 if (event != NETDEV_BONDING_FAILOVER)
4600 return NOTIFY_DONE;
4601
4602 if (!netif_is_bond_master(ndev))
4603 return NOTIFY_DONE;
4604
4605 mutex_lock(&lock);
4606 list_for_each_entry(cma_dev, &dev_list, list)
4607 list_for_each_entry(id_priv, &cma_dev->id_list, list) {
4608 ret = cma_netdev_change(ndev, id_priv);
4609 if (ret)
4610 goto out;
4611 }
4612
4613 out:
4614 mutex_unlock(&lock);
4615 return ret;
4616 }
4617
4618 static struct notifier_block cma_nb = {
4619 .notifier_call = cma_netdev_callback
4620 };
4621
4622 static void cma_add_one(struct ib_device *device)
4623 {
4624 struct cma_device *cma_dev;
4625 struct rdma_id_private *id_priv;
4626 unsigned int i;
4627 unsigned long supported_gids = 0;
4628
4629 cma_dev = kmalloc(sizeof *cma_dev, GFP_KERNEL);
4630 if (!cma_dev)
4631 return;
4632
4633 cma_dev->device = device;
4634 cma_dev->default_gid_type = kcalloc(device->phys_port_cnt,
4635 sizeof(*cma_dev->default_gid_type),
4636 GFP_KERNEL);
4637 if (!cma_dev->default_gid_type)
4638 goto free_cma_dev;
4639
4640 cma_dev->default_roce_tos = kcalloc(device->phys_port_cnt,
4641 sizeof(*cma_dev->default_roce_tos),
4642 GFP_KERNEL);
4643 if (!cma_dev->default_roce_tos)
4644 goto free_gid_type;
4645
4646 rdma_for_each_port (device, i) {
4647 supported_gids = roce_gid_type_mask_support(device, i);
4648 WARN_ON(!supported_gids);
4649 if (supported_gids & (1 << CMA_PREFERRED_ROCE_GID_TYPE))
4650 cma_dev->default_gid_type[i - rdma_start_port(device)] =
4651 CMA_PREFERRED_ROCE_GID_TYPE;
4652 else
4653 cma_dev->default_gid_type[i - rdma_start_port(device)] =
4654 find_first_bit(&supported_gids, BITS_PER_LONG);
4655 cma_dev->default_roce_tos[i - rdma_start_port(device)] = 0;
4656 }
4657
4658 init_completion(&cma_dev->comp);
4659 atomic_set(&cma_dev->refcount, 1);
4660 INIT_LIST_HEAD(&cma_dev->id_list);
4661 ib_set_client_data(device, &cma_client, cma_dev);
4662
4663 mutex_lock(&lock);
4664 list_add_tail(&cma_dev->list, &dev_list);
4665 list_for_each_entry(id_priv, &listen_any_list, list)
4666 cma_listen_on_dev(id_priv, cma_dev);
4667 mutex_unlock(&lock);
4668
4669 trace_cm_add_one(device);
4670 return;
4671
4672 free_gid_type:
4673 kfree(cma_dev->default_gid_type);
4674
4675 free_cma_dev:
4676 kfree(cma_dev);
4677
4678 return;
4679 }
4680
4681 static int cma_remove_id_dev(struct rdma_id_private *id_priv)
4682 {
4683 struct rdma_cm_event event = {};
4684 enum rdma_cm_state state;
4685 int ret = 0;
4686
4687 /* Record that we want to remove the device */
4688 state = cma_exch(id_priv, RDMA_CM_DEVICE_REMOVAL);
4689 if (state == RDMA_CM_DESTROYING)
4690 return 0;
4691
4692 cma_cancel_operation(id_priv, state);
4693 mutex_lock(&id_priv->handler_mutex);
4694
4695 /* Check for destruction from another callback. */
4696 if (!cma_comp(id_priv, RDMA_CM_DEVICE_REMOVAL))
4697 goto out;
4698
4699 event.event = RDMA_CM_EVENT_DEVICE_REMOVAL;
4700 ret = cma_cm_event_handler(id_priv, &event);
4701 out:
4702 mutex_unlock(&id_priv->handler_mutex);
4703 return ret;
4704 }
4705
4706 static void cma_process_remove(struct cma_device *cma_dev)
4707 {
4708 struct rdma_id_private *id_priv;
4709 int ret;
4710
4711 mutex_lock(&lock);
4712 while (!list_empty(&cma_dev->id_list)) {
4713 id_priv = list_entry(cma_dev->id_list.next,
4714 struct rdma_id_private, list);
4715
4716 list_del(&id_priv->listen_list);
4717 list_del_init(&id_priv->list);
4718 atomic_inc(&id_priv->refcount);
4719 mutex_unlock(&lock);
4720
4721 ret = id_priv->internal_id ? 1 : cma_remove_id_dev(id_priv);
4722 cma_deref_id(id_priv);
4723 if (ret)
4724 rdma_destroy_id(&id_priv->id);
4725
4726 mutex_lock(&lock);
4727 }
4728 mutex_unlock(&lock);
4729
4730 cma_deref_dev(cma_dev);
4731 wait_for_completion(&cma_dev->comp);
4732 }
4733
4734 static void cma_remove_one(struct ib_device *device, void *client_data)
4735 {
4736 struct cma_device *cma_dev = client_data;
4737
4738 trace_cm_remove_one(device);
4739
4740 if (!cma_dev)
4741 return;
4742
4743 mutex_lock(&lock);
4744 list_del(&cma_dev->list);
4745 mutex_unlock(&lock);
4746
4747 cma_process_remove(cma_dev);
4748 kfree(cma_dev->default_roce_tos);
4749 kfree(cma_dev->default_gid_type);
4750 kfree(cma_dev);
4751 }
4752
4753 static int cma_init_net(struct net *net)
4754 {
4755 struct cma_pernet *pernet = cma_pernet(net);
4756
4757 xa_init(&pernet->tcp_ps);
4758 xa_init(&pernet->udp_ps);
4759 xa_init(&pernet->ipoib_ps);
4760 xa_init(&pernet->ib_ps);
4761
4762 return 0;
4763 }
4764
4765 static void cma_exit_net(struct net *net)
4766 {
4767 struct cma_pernet *pernet = cma_pernet(net);
4768
4769 WARN_ON(!xa_empty(&pernet->tcp_ps));
4770 WARN_ON(!xa_empty(&pernet->udp_ps));
4771 WARN_ON(!xa_empty(&pernet->ipoib_ps));
4772 WARN_ON(!xa_empty(&pernet->ib_ps));
4773 }
4774
4775 static struct pernet_operations cma_pernet_operations = {
4776 .init = cma_init_net,
4777 .exit = cma_exit_net,
4778 .id = &cma_pernet_id,
4779 .size = sizeof(struct cma_pernet),
4780 };
4781
4782 static int __init cma_init(void)
4783 {
4784 int ret;
4785
4786 cma_wq = alloc_ordered_workqueue("rdma_cm", WQ_MEM_RECLAIM);
4787 if (!cma_wq)
4788 return -ENOMEM;
4789
4790 ret = register_pernet_subsys(&cma_pernet_operations);
4791 if (ret)
4792 goto err_wq;
4793
4794 ib_sa_register_client(&sa_client);
4795 register_netdevice_notifier(&cma_nb);
4796
4797 ret = ib_register_client(&cma_client);
4798 if (ret)
4799 goto err;
4800
4801 ret = cma_configfs_init();
4802 if (ret)
4803 goto err_ib;
4804
4805 return 0;
4806
4807 err_ib:
4808 ib_unregister_client(&cma_client);
4809 err:
4810 unregister_netdevice_notifier(&cma_nb);
4811 ib_sa_unregister_client(&sa_client);
4812 unregister_pernet_subsys(&cma_pernet_operations);
4813 err_wq:
4814 destroy_workqueue(cma_wq);
4815 return ret;
4816 }
4817
4818 static void __exit cma_cleanup(void)
4819 {
4820 cma_configfs_exit();
4821 ib_unregister_client(&cma_client);
4822 unregister_netdevice_notifier(&cma_nb);
4823 ib_sa_unregister_client(&sa_client);
4824 unregister_pernet_subsys(&cma_pernet_operations);
4825 destroy_workqueue(cma_wq);
4826 }
4827
4828 module_init(cma_init);
4829 module_exit(cma_cleanup);
Linux with added FPC-III support