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drm/rockchip: Don't change hdmi reference clock rate
[drm/drm-misc.git] / drivers / infiniband / core / cma.c
blob64ace0b968f07fc49feeb7bfabeab24020934a00
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/rbtree.h>
15 #include <linux/igmp.h>
16 #include <linux/xarray.h>
17 #include <linux/inetdevice.h>
18 #include <linux/slab.h>
19 #include <linux/module.h>
20 #include <net/route.h>
21
22 #include <net/net_namespace.h>
23 #include <net/netns/generic.h>
24 #include <net/netevent.h>
25 #include <net/tcp.h>
26 #include <net/ipv6.h>
27 #include <net/ip_fib.h>
28 #include <net/ip6_route.h>
29
30 #include <rdma/rdma_cm.h>
31 #include <rdma/rdma_cm_ib.h>
32 #include <rdma/rdma_netlink.h>
33 #include <rdma/ib.h>
34 #include <rdma/ib_cache.h>
35 #include <rdma/ib_cm.h>
36 #include <rdma/ib_sa.h>
37 #include <rdma/iw_cm.h>
38
39 #include "core_priv.h"
40 #include "cma_priv.h"
41 #include "cma_trace.h"
42
43 MODULE_AUTHOR("Sean Hefty");
44 MODULE_DESCRIPTION("Generic RDMA CM Agent");
45 MODULE_LICENSE("Dual BSD/GPL");
46
47 #define CMA_CM_RESPONSE_TIMEOUT 20
48 #define CMA_MAX_CM_RETRIES 15
49 #define CMA_CM_MRA_SETTING (IB_CM_MRA_FLAG_DELAY | 24)
50 #define CMA_IBOE_PACKET_LIFETIME 16
51 #define CMA_PREFERRED_ROCE_GID_TYPE IB_GID_TYPE_ROCE_UDP_ENCAP
52
53 static const char * const cma_events[] = {
54 [RDMA_CM_EVENT_ADDR_RESOLVED] = "address resolved",
55 [RDMA_CM_EVENT_ADDR_ERROR] = "address error",
56 [RDMA_CM_EVENT_ROUTE_RESOLVED] = "route resolved ",
57 [RDMA_CM_EVENT_ROUTE_ERROR] = "route error",
58 [RDMA_CM_EVENT_CONNECT_REQUEST] = "connect request",
59 [RDMA_CM_EVENT_CONNECT_RESPONSE] = "connect response",
60 [RDMA_CM_EVENT_CONNECT_ERROR] = "connect error",
61 [RDMA_CM_EVENT_UNREACHABLE] = "unreachable",
62 [RDMA_CM_EVENT_REJECTED] = "rejected",
63 [RDMA_CM_EVENT_ESTABLISHED] = "established",
64 [RDMA_CM_EVENT_DISCONNECTED] = "disconnected",
65 [RDMA_CM_EVENT_DEVICE_REMOVAL] = "device removal",
66 [RDMA_CM_EVENT_MULTICAST_JOIN] = "multicast join",
67 [RDMA_CM_EVENT_MULTICAST_ERROR] = "multicast error",
68 [RDMA_CM_EVENT_ADDR_CHANGE] = "address change",
69 [RDMA_CM_EVENT_TIMEWAIT_EXIT] = "timewait exit",
70 };
71
72 static void cma_iboe_set_mgid(struct sockaddr *addr, union ib_gid *mgid,
73 enum ib_gid_type gid_type);
74
75 const char *__attribute_const__ rdma_event_msg(enum rdma_cm_event_type event)
76 {
77 size_t index = event;
78
79 return (index < ARRAY_SIZE(cma_events) && cma_events[index]) ?
80 cma_events[index] : "unrecognized event";
81 }
82 EXPORT_SYMBOL(rdma_event_msg);
83
84 const char *__attribute_const__ rdma_reject_msg(struct rdma_cm_id *id,
85 int reason)
86 {
87 if (rdma_ib_or_roce(id->device, id->port_num))
88 return ibcm_reject_msg(reason);
89
90 if (rdma_protocol_iwarp(id->device, id->port_num))
91 return iwcm_reject_msg(reason);
92
93 WARN_ON_ONCE(1);
94 return "unrecognized transport";
95 }
96 EXPORT_SYMBOL(rdma_reject_msg);
97
98 /**
99 * rdma_is_consumer_reject - return true if the consumer rejected the connect
100 * request.
101 * @id: Communication identifier that received the REJECT event.
102 * @reason: Value returned in the REJECT event status field.
103 */
104 static bool rdma_is_consumer_reject(struct rdma_cm_id *id, int reason)
105 {
106 if (rdma_ib_or_roce(id->device, id->port_num))
107 return reason == IB_CM_REJ_CONSUMER_DEFINED;
108
109 if (rdma_protocol_iwarp(id->device, id->port_num))
110 return reason == -ECONNREFUSED;
111
112 WARN_ON_ONCE(1);
113 return false;
114 }
115
116 const void *rdma_consumer_reject_data(struct rdma_cm_id *id,
117 struct rdma_cm_event *ev, u8 *data_len)
118 {
119 const void *p;
120
121 if (rdma_is_consumer_reject(id, ev->status)) {
122 *data_len = ev->param.conn.private_data_len;
123 p = ev->param.conn.private_data;
124 } else {
125 *data_len = 0;
126 p = NULL;
127 }
128 return p;
129 }
130 EXPORT_SYMBOL(rdma_consumer_reject_data);
131
132 /**
133 * rdma_iw_cm_id() - return the iw_cm_id pointer for this cm_id.
134 * @id: Communication Identifier
135 */
136 struct iw_cm_id *rdma_iw_cm_id(struct rdma_cm_id *id)
137 {
138 struct rdma_id_private *id_priv;
139
140 id_priv = container_of(id, struct rdma_id_private, id);
141 if (id->device->node_type == RDMA_NODE_RNIC)
142 return id_priv->cm_id.iw;
143 return NULL;
144 }
145 EXPORT_SYMBOL(rdma_iw_cm_id);
146
147 /**
148 * rdma_res_to_id() - return the rdma_cm_id pointer for this restrack.
149 * @res: rdma resource tracking entry pointer
150 */
151 struct rdma_cm_id *rdma_res_to_id(struct rdma_restrack_entry *res)
152 {
153 struct rdma_id_private *id_priv =
154 container_of(res, struct rdma_id_private, res);
155
156 return &id_priv->id;
157 }
158 EXPORT_SYMBOL(rdma_res_to_id);
159
160 static int cma_add_one(struct ib_device *device);
161 static void cma_remove_one(struct ib_device *device, void *client_data);
162
163 static struct ib_client cma_client = {
164 .name = "cma",
165 .add = cma_add_one,
166 .remove = cma_remove_one
167 };
168
169 static struct ib_sa_client sa_client;
170 static LIST_HEAD(dev_list);
171 static LIST_HEAD(listen_any_list);
172 static DEFINE_MUTEX(lock);
173 static struct rb_root id_table = RB_ROOT;
174 /* Serialize operations of id_table tree */
175 static DEFINE_SPINLOCK(id_table_lock);
176 static struct workqueue_struct *cma_wq;
177 static unsigned int cma_pernet_id;
178
179 struct cma_pernet {
180 struct xarray tcp_ps;
181 struct xarray udp_ps;
182 struct xarray ipoib_ps;
183 struct xarray ib_ps;
184 };
185
186 static struct cma_pernet *cma_pernet(struct net *net)
187 {
188 return net_generic(net, cma_pernet_id);
189 }
190
191 static
192 struct xarray *cma_pernet_xa(struct net *net, enum rdma_ucm_port_space ps)
193 {
194 struct cma_pernet *pernet = cma_pernet(net);
195
196 switch (ps) {
197 case RDMA_PS_TCP:
198 return &pernet->tcp_ps;
199 case RDMA_PS_UDP:
200 return &pernet->udp_ps;
201 case RDMA_PS_IPOIB:
202 return &pernet->ipoib_ps;
203 case RDMA_PS_IB:
204 return &pernet->ib_ps;
205 default:
206 return NULL;
207 }
208 }
209
210 struct id_table_entry {
211 struct list_head id_list;
212 struct rb_node rb_node;
213 };
214
215 struct cma_device {
216 struct list_head list;
217 struct ib_device *device;
218 struct completion comp;
219 refcount_t refcount;
220 struct list_head id_list;
221 enum ib_gid_type *default_gid_type;
222 u8 *default_roce_tos;
223 };
224
225 struct rdma_bind_list {
226 enum rdma_ucm_port_space ps;
227 struct hlist_head owners;
228 unsigned short port;
229 };
230
231 static int cma_ps_alloc(struct net *net, enum rdma_ucm_port_space ps,
232 struct rdma_bind_list *bind_list, int snum)
233 {
234 struct xarray *xa = cma_pernet_xa(net, ps);
235
236 return xa_insert(xa, snum, bind_list, GFP_KERNEL);
237 }
238
239 static struct rdma_bind_list *cma_ps_find(struct net *net,
240 enum rdma_ucm_port_space ps, int snum)
241 {
242 struct xarray *xa = cma_pernet_xa(net, ps);
243
244 return xa_load(xa, snum);
245 }
246
247 static void cma_ps_remove(struct net *net, enum rdma_ucm_port_space ps,
248 int snum)
249 {
250 struct xarray *xa = cma_pernet_xa(net, ps);
251
252 xa_erase(xa, snum);
253 }
254
255 enum {
256 CMA_OPTION_AFONLY,
257 };
258
259 void cma_dev_get(struct cma_device *cma_dev)
260 {
261 refcount_inc(&cma_dev->refcount);
262 }
263
264 void cma_dev_put(struct cma_device *cma_dev)
265 {
266 if (refcount_dec_and_test(&cma_dev->refcount))
267 complete(&cma_dev->comp);
268 }
269
270 struct cma_device *cma_enum_devices_by_ibdev(cma_device_filter filter,
271 void *cookie)
272 {
273 struct cma_device *cma_dev;
274 struct cma_device *found_cma_dev = NULL;
275
276 mutex_lock(&lock);
277
278 list_for_each_entry(cma_dev, &dev_list, list)
279 if (filter(cma_dev->device, cookie)) {
280 found_cma_dev = cma_dev;
281 break;
282 }
283
284 if (found_cma_dev)
285 cma_dev_get(found_cma_dev);
286 mutex_unlock(&lock);
287 return found_cma_dev;
288 }
289
290 int cma_get_default_gid_type(struct cma_device *cma_dev,
291 u32 port)
292 {
293 if (!rdma_is_port_valid(cma_dev->device, port))
294 return -EINVAL;
295
296 return cma_dev->default_gid_type[port - rdma_start_port(cma_dev->device)];
297 }
298
299 int cma_set_default_gid_type(struct cma_device *cma_dev,
300 u32 port,
301 enum ib_gid_type default_gid_type)
302 {
303 unsigned long supported_gids;
304
305 if (!rdma_is_port_valid(cma_dev->device, port))
306 return -EINVAL;
307
308 if (default_gid_type == IB_GID_TYPE_IB &&
309 rdma_protocol_roce_eth_encap(cma_dev->device, port))
310 default_gid_type = IB_GID_TYPE_ROCE;
311
312 supported_gids = roce_gid_type_mask_support(cma_dev->device, port);
313
314 if (!(supported_gids & 1 << default_gid_type))
315 return -EINVAL;
316
317 cma_dev->default_gid_type[port - rdma_start_port(cma_dev->device)] =
318 default_gid_type;
319
320 return 0;
321 }
322
323 int cma_get_default_roce_tos(struct cma_device *cma_dev, u32 port)
324 {
325 if (!rdma_is_port_valid(cma_dev->device, port))
326 return -EINVAL;
327
328 return cma_dev->default_roce_tos[port - rdma_start_port(cma_dev->device)];
329 }
330
331 int cma_set_default_roce_tos(struct cma_device *cma_dev, u32 port,
332 u8 default_roce_tos)
333 {
334 if (!rdma_is_port_valid(cma_dev->device, port))
335 return -EINVAL;
336
337 cma_dev->default_roce_tos[port - rdma_start_port(cma_dev->device)] =
338 default_roce_tos;
339
340 return 0;
341 }
342 struct ib_device *cma_get_ib_dev(struct cma_device *cma_dev)
343 {
344 return cma_dev->device;
345 }
346
347 /*
348 * Device removal can occur at anytime, so we need extra handling to
349 * serialize notifying the user of device removal with other callbacks.
350 * We do this by disabling removal notification while a callback is in process,
351 * and reporting it after the callback completes.
352 */
353
354 struct cma_multicast {
355 struct rdma_id_private *id_priv;
356 union {
357 struct ib_sa_multicast *sa_mc;
358 struct {
359 struct work_struct work;
360 struct rdma_cm_event event;
361 } iboe_join;
362 };
363 struct list_head list;
364 void *context;
365 struct sockaddr_storage addr;
366 u8 join_state;
367 };
368
369 struct cma_work {
370 struct work_struct work;
371 struct rdma_id_private *id;
372 enum rdma_cm_state old_state;
373 enum rdma_cm_state new_state;
374 struct rdma_cm_event event;
375 };
376
377 union cma_ip_addr {
378 struct in6_addr ip6;
379 struct {
380 __be32 pad[3];
381 __be32 addr;
382 } ip4;
383 };
384
385 struct cma_hdr {
386 u8 cma_version;
387 u8 ip_version; /* IP version: 7:4 */
388 __be16 port;
389 union cma_ip_addr src_addr;
390 union cma_ip_addr dst_addr;
391 };
392
393 #define CMA_VERSION 0x00
394
395 struct cma_req_info {
396 struct sockaddr_storage listen_addr_storage;
397 struct sockaddr_storage src_addr_storage;
398 struct ib_device *device;
399 union ib_gid local_gid;
400 __be64 service_id;
401 int port;
402 bool has_gid;
403 u16 pkey;
404 };
405
406 static int cma_comp_exch(struct rdma_id_private *id_priv,
407 enum rdma_cm_state comp, enum rdma_cm_state exch)
408 {
409 unsigned long flags;
410 int ret;
411
412 /*
413 * The FSM uses a funny double locking where state is protected by both
414 * the handler_mutex and the spinlock. State is not allowed to change
415 * to/from a handler_mutex protected value without also holding
416 * handler_mutex.
417 */
418 if (comp == RDMA_CM_CONNECT || exch == RDMA_CM_CONNECT)
419 lockdep_assert_held(&id_priv->handler_mutex);
420
421 spin_lock_irqsave(&id_priv->lock, flags);
422 if ((ret = (id_priv->state == comp)))
423 id_priv->state = exch;
424 spin_unlock_irqrestore(&id_priv->lock, flags);
425 return ret;
426 }
427
428 static inline u8 cma_get_ip_ver(const struct cma_hdr *hdr)
429 {
430 return hdr->ip_version >> 4;
431 }
432
433 static void cma_set_ip_ver(struct cma_hdr *hdr, u8 ip_ver)
434 {
435 hdr->ip_version = (ip_ver << 4) | (hdr->ip_version & 0xF);
436 }
437
438 static struct sockaddr *cma_src_addr(struct rdma_id_private *id_priv)
439 {
440 return (struct sockaddr *)&id_priv->id.route.addr.src_addr;
441 }
442
443 static inline struct sockaddr *cma_dst_addr(struct rdma_id_private *id_priv)
444 {
445 return (struct sockaddr *)&id_priv->id.route.addr.dst_addr;
446 }
447
448 static int cma_igmp_send(struct net_device *ndev, union ib_gid *mgid, bool join)
449 {
450 struct in_device *in_dev = NULL;
451
452 if (ndev) {
453 rtnl_lock();
454 in_dev = __in_dev_get_rtnl(ndev);
455 if (in_dev) {
456 if (join)
457 ip_mc_inc_group(in_dev,
458 *(__be32 *)(mgid->raw + 12));
459 else
460 ip_mc_dec_group(in_dev,
461 *(__be32 *)(mgid->raw + 12));
462 }
463 rtnl_unlock();
464 }
465 return (in_dev) ? 0 : -ENODEV;
466 }
467
468 static int compare_netdev_and_ip(int ifindex_a, struct sockaddr *sa,
469 struct id_table_entry *entry_b)
470 {
471 struct rdma_id_private *id_priv = list_first_entry(
472 &entry_b->id_list, struct rdma_id_private, id_list_entry);
473 int ifindex_b = id_priv->id.route.addr.dev_addr.bound_dev_if;
474 struct sockaddr *sb = cma_dst_addr(id_priv);
475
476 if (ifindex_a != ifindex_b)
477 return (ifindex_a > ifindex_b) ? 1 : -1;
478
479 if (sa->sa_family != sb->sa_family)
480 return sa->sa_family - sb->sa_family;
481
482 if (sa->sa_family == AF_INET &&
483 __builtin_object_size(sa, 0) >= sizeof(struct sockaddr_in)) {
484 return memcmp(&((struct sockaddr_in *)sa)->sin_addr,
485 &((struct sockaddr_in *)sb)->sin_addr,
486 sizeof(((struct sockaddr_in *)sa)->sin_addr));
487 }
488
489 if (sa->sa_family == AF_INET6 &&
490 __builtin_object_size(sa, 0) >= sizeof(struct sockaddr_in6)) {
491 return ipv6_addr_cmp(&((struct sockaddr_in6 *)sa)->sin6_addr,
492 &((struct sockaddr_in6 *)sb)->sin6_addr);
493 }
494
495 return -1;
496 }
497
498 static int cma_add_id_to_tree(struct rdma_id_private *node_id_priv)
499 {
500 struct rb_node **new, *parent = NULL;
501 struct id_table_entry *this, *node;
502 unsigned long flags;
503 int result;
504
505 node = kzalloc(sizeof(*node), GFP_KERNEL);
506 if (!node)
507 return -ENOMEM;
508
509 spin_lock_irqsave(&id_table_lock, flags);
510 new = &id_table.rb_node;
511 while (*new) {
512 this = container_of(*new, struct id_table_entry, rb_node);
513 result = compare_netdev_and_ip(
514 node_id_priv->id.route.addr.dev_addr.bound_dev_if,
515 cma_dst_addr(node_id_priv), this);
516
517 parent = *new;
518 if (result < 0)
519 new = &((*new)->rb_left);
520 else if (result > 0)
521 new = &((*new)->rb_right);
522 else {
523 list_add_tail(&node_id_priv->id_list_entry,
524 &this->id_list);
525 kfree(node);
526 goto unlock;
527 }
528 }
529
530 INIT_LIST_HEAD(&node->id_list);
531 list_add_tail(&node_id_priv->id_list_entry, &node->id_list);
532
533 rb_link_node(&node->rb_node, parent, new);
534 rb_insert_color(&node->rb_node, &id_table);
535
536 unlock:
537 spin_unlock_irqrestore(&id_table_lock, flags);
538 return 0;
539 }
540
541 static struct id_table_entry *
542 node_from_ndev_ip(struct rb_root *root, int ifindex, struct sockaddr *sa)
543 {
544 struct rb_node *node = root->rb_node;
545 struct id_table_entry *data;
546 int result;
547
548 while (node) {
549 data = container_of(node, struct id_table_entry, rb_node);
550 result = compare_netdev_and_ip(ifindex, sa, data);
551 if (result < 0)
552 node = node->rb_left;
553 else if (result > 0)
554 node = node->rb_right;
555 else
556 return data;
557 }
558
559 return NULL;
560 }
561
562 static void cma_remove_id_from_tree(struct rdma_id_private *id_priv)
563 {
564 struct id_table_entry *data;
565 unsigned long flags;
566
567 spin_lock_irqsave(&id_table_lock, flags);
568 if (list_empty(&id_priv->id_list_entry))
569 goto out;
570
571 data = node_from_ndev_ip(&id_table,
572 id_priv->id.route.addr.dev_addr.bound_dev_if,
573 cma_dst_addr(id_priv));
574 if (!data)
575 goto out;
576
577 list_del_init(&id_priv->id_list_entry);
578 if (list_empty(&data->id_list)) {
579 rb_erase(&data->rb_node, &id_table);
580 kfree(data);
581 }
582 out:
583 spin_unlock_irqrestore(&id_table_lock, flags);
584 }
585
586 static void _cma_attach_to_dev(struct rdma_id_private *id_priv,
587 struct cma_device *cma_dev)
588 {
589 cma_dev_get(cma_dev);
590 id_priv->cma_dev = cma_dev;
591 id_priv->id.device = cma_dev->device;
592 id_priv->id.route.addr.dev_addr.transport =
593 rdma_node_get_transport(cma_dev->device->node_type);
594 list_add_tail(&id_priv->device_item, &cma_dev->id_list);
595
596 trace_cm_id_attach(id_priv, cma_dev->device);
597 }
598
599 static void cma_attach_to_dev(struct rdma_id_private *id_priv,
600 struct cma_device *cma_dev)
601 {
602 _cma_attach_to_dev(id_priv, cma_dev);
603 id_priv->gid_type =
604 cma_dev->default_gid_type[id_priv->id.port_num -
605 rdma_start_port(cma_dev->device)];
606 }
607
608 static void cma_release_dev(struct rdma_id_private *id_priv)
609 {
610 mutex_lock(&lock);
611 list_del_init(&id_priv->device_item);
612 cma_dev_put(id_priv->cma_dev);
613 id_priv->cma_dev = NULL;
614 id_priv->id.device = NULL;
615 if (id_priv->id.route.addr.dev_addr.sgid_attr) {
616 rdma_put_gid_attr(id_priv->id.route.addr.dev_addr.sgid_attr);
617 id_priv->id.route.addr.dev_addr.sgid_attr = NULL;
618 }
619 mutex_unlock(&lock);
620 }
621
622 static inline unsigned short cma_family(struct rdma_id_private *id_priv)
623 {
624 return id_priv->id.route.addr.src_addr.ss_family;
625 }
626
627 static int cma_set_default_qkey(struct rdma_id_private *id_priv)
628 {
629 struct ib_sa_mcmember_rec rec;
630 int ret = 0;
631
632 switch (id_priv->id.ps) {
633 case RDMA_PS_UDP:
634 case RDMA_PS_IB:
635 id_priv->qkey = RDMA_UDP_QKEY;
636 break;
637 case RDMA_PS_IPOIB:
638 ib_addr_get_mgid(&id_priv->id.route.addr.dev_addr, &rec.mgid);
639 ret = ib_sa_get_mcmember_rec(id_priv->id.device,
640 id_priv->id.port_num, &rec.mgid,
641 &rec);
642 if (!ret)
643 id_priv->qkey = be32_to_cpu(rec.qkey);
644 break;
645 default:
646 break;
647 }
648 return ret;
649 }
650
651 static int cma_set_qkey(struct rdma_id_private *id_priv, u32 qkey)
652 {
653 if (!qkey ||
654 (id_priv->qkey && (id_priv->qkey != qkey)))
655 return -EINVAL;
656
657 id_priv->qkey = qkey;
658 return 0;
659 }
660
661 static void cma_translate_ib(struct sockaddr_ib *sib, struct rdma_dev_addr *dev_addr)
662 {
663 dev_addr->dev_type = ARPHRD_INFINIBAND;
664 rdma_addr_set_sgid(dev_addr, (union ib_gid *) &sib->sib_addr);
665 ib_addr_set_pkey(dev_addr, ntohs(sib->sib_pkey));
666 }
667
668 static int cma_translate_addr(struct sockaddr *addr, struct rdma_dev_addr *dev_addr)
669 {
670 int ret;
671
672 if (addr->sa_family != AF_IB) {
673 ret = rdma_translate_ip(addr, dev_addr);
674 } else {
675 cma_translate_ib((struct sockaddr_ib *) addr, dev_addr);
676 ret = 0;
677 }
678
679 return ret;
680 }
681
682 static const struct ib_gid_attr *
683 cma_validate_port(struct ib_device *device, u32 port,
684 enum ib_gid_type gid_type,
685 union ib_gid *gid,
686 struct rdma_id_private *id_priv)
687 {
688 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
689 const struct ib_gid_attr *sgid_attr = ERR_PTR(-ENODEV);
690 int bound_if_index = dev_addr->bound_dev_if;
691 int dev_type = dev_addr->dev_type;
692 struct net_device *ndev = NULL;
693
694 if (!rdma_dev_access_netns(device, id_priv->id.route.addr.dev_addr.net))
695 goto out;
696
697 if ((dev_type == ARPHRD_INFINIBAND) && !rdma_protocol_ib(device, port))
698 goto out;
699
700 if ((dev_type != ARPHRD_INFINIBAND) && rdma_protocol_ib(device, port))
701 goto out;
702
703 /*
704 * For drivers that do not associate more than one net device with
705 * their gid tables, such as iWARP drivers, it is sufficient to
706 * return the first table entry.
707 *
708 * Other driver classes might be included in the future.
709 */
710 if (rdma_protocol_iwarp(device, port)) {
711 sgid_attr = rdma_get_gid_attr(device, port, 0);
712 if (IS_ERR(sgid_attr))
713 goto out;
714
715 rcu_read_lock();
716 ndev = rcu_dereference(sgid_attr->ndev);
717 if (!net_eq(dev_net(ndev), dev_addr->net) ||
718 ndev->ifindex != bound_if_index) {
719 rdma_put_gid_attr(sgid_attr);
720 sgid_attr = ERR_PTR(-ENODEV);
721 }
722 rcu_read_unlock();
723 goto out;
724 }
725
726 if (dev_type == ARPHRD_ETHER && rdma_protocol_roce(device, port)) {
727 ndev = dev_get_by_index(dev_addr->net, bound_if_index);
728 if (!ndev)
729 goto out;
730 } else {
731 gid_type = IB_GID_TYPE_IB;
732 }
733
734 sgid_attr = rdma_find_gid_by_port(device, gid, gid_type, port, ndev);
735 dev_put(ndev);
736 out:
737 return sgid_attr;
738 }
739
740 static void cma_bind_sgid_attr(struct rdma_id_private *id_priv,
741 const struct ib_gid_attr *sgid_attr)
742 {
743 WARN_ON(id_priv->id.route.addr.dev_addr.sgid_attr);
744 id_priv->id.route.addr.dev_addr.sgid_attr = sgid_attr;
745 }
746
747 /**
748 * cma_acquire_dev_by_src_ip - Acquire cma device, port, gid attribute
749 * based on source ip address.
750 * @id_priv: cm_id which should be bound to cma device
751 *
752 * cma_acquire_dev_by_src_ip() binds cm id to cma device, port and GID attribute
753 * based on source IP address. It returns 0 on success or error code otherwise.
754 * It is applicable to active and passive side cm_id.
755 */
756 static int cma_acquire_dev_by_src_ip(struct rdma_id_private *id_priv)
757 {
758 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
759 const struct ib_gid_attr *sgid_attr;
760 union ib_gid gid, iboe_gid, *gidp;
761 struct cma_device *cma_dev;
762 enum ib_gid_type gid_type;
763 int ret = -ENODEV;
764 u32 port;
765
766 if (dev_addr->dev_type != ARPHRD_INFINIBAND &&
767 id_priv->id.ps == RDMA_PS_IPOIB)
768 return -EINVAL;
769
770 rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
771 &iboe_gid);
772
773 memcpy(&gid, dev_addr->src_dev_addr +
774 rdma_addr_gid_offset(dev_addr), sizeof(gid));
775
776 mutex_lock(&lock);
777 list_for_each_entry(cma_dev, &dev_list, list) {
778 rdma_for_each_port (cma_dev->device, port) {
779 gidp = rdma_protocol_roce(cma_dev->device, port) ?
780 &iboe_gid : &gid;
781 gid_type = cma_dev->default_gid_type[port - 1];
782 sgid_attr = cma_validate_port(cma_dev->device, port,
783 gid_type, gidp, id_priv);
784 if (!IS_ERR(sgid_attr)) {
785 id_priv->id.port_num = port;
786 cma_bind_sgid_attr(id_priv, sgid_attr);
787 cma_attach_to_dev(id_priv, cma_dev);
788 ret = 0;
789 goto out;
790 }
791 }
792 }
793 out:
794 mutex_unlock(&lock);
795 return ret;
796 }
797
798 /**
799 * cma_ib_acquire_dev - Acquire cma device, port and SGID attribute
800 * @id_priv: cm id to bind to cma device
801 * @listen_id_priv: listener cm id to match against
802 * @req: Pointer to req structure containaining incoming
803 * request information
804 * cma_ib_acquire_dev() acquires cma device, port and SGID attribute when
805 * rdma device matches for listen_id and incoming request. It also verifies
806 * that a GID table entry is present for the source address.
807 * Returns 0 on success, or returns error code otherwise.
808 */
809 static int cma_ib_acquire_dev(struct rdma_id_private *id_priv,
810 const struct rdma_id_private *listen_id_priv,
811 struct cma_req_info *req)
812 {
813 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
814 const struct ib_gid_attr *sgid_attr;
815 enum ib_gid_type gid_type;
816 union ib_gid gid;
817
818 if (dev_addr->dev_type != ARPHRD_INFINIBAND &&
819 id_priv->id.ps == RDMA_PS_IPOIB)
820 return -EINVAL;
821
822 if (rdma_protocol_roce(req->device, req->port))
823 rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
824 &gid);
825 else
826 memcpy(&gid, dev_addr->src_dev_addr +
827 rdma_addr_gid_offset(dev_addr), sizeof(gid));
828
829 gid_type = listen_id_priv->cma_dev->default_gid_type[req->port - 1];
830 sgid_attr = cma_validate_port(req->device, req->port,
831 gid_type, &gid, id_priv);
832 if (IS_ERR(sgid_attr))
833 return PTR_ERR(sgid_attr);
834
835 id_priv->id.port_num = req->port;
836 cma_bind_sgid_attr(id_priv, sgid_attr);
837 /* Need to acquire lock to protect against reader
838 * of cma_dev->id_list such as cma_netdev_callback() and
839 * cma_process_remove().
840 */
841 mutex_lock(&lock);
842 cma_attach_to_dev(id_priv, listen_id_priv->cma_dev);
843 mutex_unlock(&lock);
844 rdma_restrack_add(&id_priv->res);
845 return 0;
846 }
847
848 static int cma_iw_acquire_dev(struct rdma_id_private *id_priv,
849 const struct rdma_id_private *listen_id_priv)
850 {
851 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
852 const struct ib_gid_attr *sgid_attr;
853 struct cma_device *cma_dev;
854 enum ib_gid_type gid_type;
855 int ret = -ENODEV;
856 union ib_gid gid;
857 u32 port;
858
859 if (dev_addr->dev_type != ARPHRD_INFINIBAND &&
860 id_priv->id.ps == RDMA_PS_IPOIB)
861 return -EINVAL;
862
863 memcpy(&gid, dev_addr->src_dev_addr +
864 rdma_addr_gid_offset(dev_addr), sizeof(gid));
865
866 mutex_lock(&lock);
867
868 cma_dev = listen_id_priv->cma_dev;
869 port = listen_id_priv->id.port_num;
870 gid_type = listen_id_priv->gid_type;
871 sgid_attr = cma_validate_port(cma_dev->device, port,
872 gid_type, &gid, id_priv);
873 if (!IS_ERR(sgid_attr)) {
874 id_priv->id.port_num = port;
875 cma_bind_sgid_attr(id_priv, sgid_attr);
876 ret = 0;
877 goto out;
878 }
879
880 list_for_each_entry(cma_dev, &dev_list, list) {
881 rdma_for_each_port (cma_dev->device, port) {
882 if (listen_id_priv->cma_dev == cma_dev &&
883 listen_id_priv->id.port_num == port)
884 continue;
885
886 gid_type = cma_dev->default_gid_type[port - 1];
887 sgid_attr = cma_validate_port(cma_dev->device, port,
888 gid_type, &gid, id_priv);
889 if (!IS_ERR(sgid_attr)) {
890 id_priv->id.port_num = port;
891 cma_bind_sgid_attr(id_priv, sgid_attr);
892 ret = 0;
893 goto out;
894 }
895 }
896 }
897
898 out:
899 if (!ret) {
900 cma_attach_to_dev(id_priv, cma_dev);
901 rdma_restrack_add(&id_priv->res);
902 }
903
904 mutex_unlock(&lock);
905 return ret;
906 }
907
908 /*
909 * Select the source IB device and address to reach the destination IB address.
910 */
911 static int cma_resolve_ib_dev(struct rdma_id_private *id_priv)
912 {
913 struct cma_device *cma_dev, *cur_dev;
914 struct sockaddr_ib *addr;
915 union ib_gid gid, sgid, *dgid;
916 unsigned int p;
917 u16 pkey, index;
918 enum ib_port_state port_state;
919 int ret;
920 int i;
921
922 cma_dev = NULL;
923 addr = (struct sockaddr_ib *) cma_dst_addr(id_priv);
924 dgid = (union ib_gid *) &addr->sib_addr;
925 pkey = ntohs(addr->sib_pkey);
926
927 mutex_lock(&lock);
928 list_for_each_entry(cur_dev, &dev_list, list) {
929 rdma_for_each_port (cur_dev->device, p) {
930 if (!rdma_cap_af_ib(cur_dev->device, p))
931 continue;
932
933 if (ib_find_cached_pkey(cur_dev->device, p, pkey, &index))
934 continue;
935
936 if (ib_get_cached_port_state(cur_dev->device, p, &port_state))
937 continue;
938
939 for (i = 0; i < cur_dev->device->port_data[p].immutable.gid_tbl_len;
940 ++i) {
941 ret = rdma_query_gid(cur_dev->device, p, i,
942 &gid);
943 if (ret)
944 continue;
945
946 if (!memcmp(&gid, dgid, sizeof(gid))) {
947 cma_dev = cur_dev;
948 sgid = gid;
949 id_priv->id.port_num = p;
950 goto found;
951 }
952
953 if (!cma_dev && (gid.global.subnet_prefix ==
954 dgid->global.subnet_prefix) &&
955 port_state == IB_PORT_ACTIVE) {
956 cma_dev = cur_dev;
957 sgid = gid;
958 id_priv->id.port_num = p;
959 goto found;
960 }
961 }
962 }
963 }
964 mutex_unlock(&lock);
965 return -ENODEV;
966
967 found:
968 cma_attach_to_dev(id_priv, cma_dev);
969 rdma_restrack_add(&id_priv->res);
970 mutex_unlock(&lock);
971 addr = (struct sockaddr_ib *)cma_src_addr(id_priv);
972 memcpy(&addr->sib_addr, &sgid, sizeof(sgid));
973 cma_translate_ib(addr, &id_priv->id.route.addr.dev_addr);
974 return 0;
975 }
976
977 static void cma_id_get(struct rdma_id_private *id_priv)
978 {
979 refcount_inc(&id_priv->refcount);
980 }
981
982 static void cma_id_put(struct rdma_id_private *id_priv)
983 {
984 if (refcount_dec_and_test(&id_priv->refcount))
985 complete(&id_priv->comp);
986 }
987
988 static struct rdma_id_private *
989 __rdma_create_id(struct net *net, rdma_cm_event_handler event_handler,
990 void *context, enum rdma_ucm_port_space ps,
991 enum ib_qp_type qp_type, const struct rdma_id_private *parent)
992 {
993 struct rdma_id_private *id_priv;
994
995 id_priv = kzalloc(sizeof *id_priv, GFP_KERNEL);
996 if (!id_priv)
997 return ERR_PTR(-ENOMEM);
998
999 id_priv->state = RDMA_CM_IDLE;
1000 id_priv->id.context = context;
1001 id_priv->id.event_handler = event_handler;
1002 id_priv->id.ps = ps;
1003 id_priv->id.qp_type = qp_type;
1004 id_priv->tos_set = false;
1005 id_priv->timeout_set = false;
1006 id_priv->min_rnr_timer_set = false;
1007 id_priv->gid_type = IB_GID_TYPE_IB;
1008 spin_lock_init(&id_priv->lock);
1009 mutex_init(&id_priv->qp_mutex);
1010 init_completion(&id_priv->comp);
1011 refcount_set(&id_priv->refcount, 1);
1012 mutex_init(&id_priv->handler_mutex);
1013 INIT_LIST_HEAD(&id_priv->device_item);
1014 INIT_LIST_HEAD(&id_priv->id_list_entry);
1015 INIT_LIST_HEAD(&id_priv->listen_list);
1016 INIT_LIST_HEAD(&id_priv->mc_list);
1017 get_random_bytes(&id_priv->seq_num, sizeof id_priv->seq_num);
1018 id_priv->id.route.addr.dev_addr.net = get_net(net);
1019 id_priv->seq_num &= 0x00ffffff;
1020
1021 rdma_restrack_new(&id_priv->res, RDMA_RESTRACK_CM_ID);
1022 if (parent)
1023 rdma_restrack_parent_name(&id_priv->res, &parent->res);
1024
1025 return id_priv;
1026 }
1027
1028 struct rdma_cm_id *
1029 __rdma_create_kernel_id(struct net *net, rdma_cm_event_handler event_handler,
1030 void *context, enum rdma_ucm_port_space ps,
1031 enum ib_qp_type qp_type, const char *caller)
1032 {
1033 struct rdma_id_private *ret;
1034
1035 ret = __rdma_create_id(net, event_handler, context, ps, qp_type, NULL);
1036 if (IS_ERR(ret))
1037 return ERR_CAST(ret);
1038
1039 rdma_restrack_set_name(&ret->res, caller);
1040 return &ret->id;
1041 }
1042 EXPORT_SYMBOL(__rdma_create_kernel_id);
1043
1044 struct rdma_cm_id *rdma_create_user_id(rdma_cm_event_handler event_handler,
1045 void *context,
1046 enum rdma_ucm_port_space ps,
1047 enum ib_qp_type qp_type)
1048 {
1049 struct rdma_id_private *ret;
1050
1051 ret = __rdma_create_id(current->nsproxy->net_ns, event_handler, context,
1052 ps, qp_type, NULL);
1053 if (IS_ERR(ret))
1054 return ERR_CAST(ret);
1055
1056 rdma_restrack_set_name(&ret->res, NULL);
1057 return &ret->id;
1058 }
1059 EXPORT_SYMBOL(rdma_create_user_id);
1060
1061 static int cma_init_ud_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
1062 {
1063 struct ib_qp_attr qp_attr;
1064 int qp_attr_mask, ret;
1065
1066 qp_attr.qp_state = IB_QPS_INIT;
1067 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
1068 if (ret)
1069 return ret;
1070
1071 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
1072 if (ret)
1073 return ret;
1074
1075 qp_attr.qp_state = IB_QPS_RTR;
1076 ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE);
1077 if (ret)
1078 return ret;
1079
1080 qp_attr.qp_state = IB_QPS_RTS;
1081 qp_attr.sq_psn = 0;
1082 ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE | IB_QP_SQ_PSN);
1083
1084 return ret;
1085 }
1086
1087 static int cma_init_conn_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
1088 {
1089 struct ib_qp_attr qp_attr;
1090 int qp_attr_mask, ret;
1091
1092 qp_attr.qp_state = IB_QPS_INIT;
1093 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
1094 if (ret)
1095 return ret;
1096
1097 return ib_modify_qp(qp, &qp_attr, qp_attr_mask);
1098 }
1099
1100 int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd,
1101 struct ib_qp_init_attr *qp_init_attr)
1102 {
1103 struct rdma_id_private *id_priv;
1104 struct ib_qp *qp;
1105 int ret;
1106
1107 id_priv = container_of(id, struct rdma_id_private, id);
1108 if (id->device != pd->device) {
1109 ret = -EINVAL;
1110 goto out_err;
1111 }
1112
1113 qp_init_attr->port_num = id->port_num;
1114 qp = ib_create_qp(pd, qp_init_attr);
1115 if (IS_ERR(qp)) {
1116 ret = PTR_ERR(qp);
1117 goto out_err;
1118 }
1119
1120 if (id->qp_type == IB_QPT_UD)
1121 ret = cma_init_ud_qp(id_priv, qp);
1122 else
1123 ret = cma_init_conn_qp(id_priv, qp);
1124 if (ret)
1125 goto out_destroy;
1126
1127 id->qp = qp;
1128 id_priv->qp_num = qp->qp_num;
1129 id_priv->srq = (qp->srq != NULL);
1130 trace_cm_qp_create(id_priv, pd, qp_init_attr, 0);
1131 return 0;
1132 out_destroy:
1133 ib_destroy_qp(qp);
1134 out_err:
1135 trace_cm_qp_create(id_priv, pd, qp_init_attr, ret);
1136 return ret;
1137 }
1138 EXPORT_SYMBOL(rdma_create_qp);
1139
1140 void rdma_destroy_qp(struct rdma_cm_id *id)
1141 {
1142 struct rdma_id_private *id_priv;
1143
1144 id_priv = container_of(id, struct rdma_id_private, id);
1145 trace_cm_qp_destroy(id_priv);
1146 mutex_lock(&id_priv->qp_mutex);
1147 ib_destroy_qp(id_priv->id.qp);
1148 id_priv->id.qp = NULL;
1149 mutex_unlock(&id_priv->qp_mutex);
1150 }
1151 EXPORT_SYMBOL(rdma_destroy_qp);
1152
1153 static int cma_modify_qp_rtr(struct rdma_id_private *id_priv,
1154 struct rdma_conn_param *conn_param)
1155 {
1156 struct ib_qp_attr qp_attr;
1157 int qp_attr_mask, ret;
1158
1159 mutex_lock(&id_priv->qp_mutex);
1160 if (!id_priv->id.qp) {
1161 ret = 0;
1162 goto out;
1163 }
1164
1165 /* Need to update QP attributes from default values. */
1166 qp_attr.qp_state = IB_QPS_INIT;
1167 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
1168 if (ret)
1169 goto out;
1170
1171 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
1172 if (ret)
1173 goto out;
1174
1175 qp_attr.qp_state = IB_QPS_RTR;
1176 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
1177 if (ret)
1178 goto out;
1179
1180 BUG_ON(id_priv->cma_dev->device != id_priv->id.device);
1181
1182 if (conn_param)
1183 qp_attr.max_dest_rd_atomic = conn_param->responder_resources;
1184 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
1185 out:
1186 mutex_unlock(&id_priv->qp_mutex);
1187 return ret;
1188 }
1189
1190 static int cma_modify_qp_rts(struct rdma_id_private *id_priv,
1191 struct rdma_conn_param *conn_param)
1192 {
1193 struct ib_qp_attr qp_attr;
1194 int qp_attr_mask, ret;
1195
1196 mutex_lock(&id_priv->qp_mutex);
1197 if (!id_priv->id.qp) {
1198 ret = 0;
1199 goto out;
1200 }
1201
1202 qp_attr.qp_state = IB_QPS_RTS;
1203 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
1204 if (ret)
1205 goto out;
1206
1207 if (conn_param)
1208 qp_attr.max_rd_atomic = conn_param->initiator_depth;
1209 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
1210 out:
1211 mutex_unlock(&id_priv->qp_mutex);
1212 return ret;
1213 }
1214
1215 static int cma_modify_qp_err(struct rdma_id_private *id_priv)
1216 {
1217 struct ib_qp_attr qp_attr;
1218 int ret;
1219
1220 mutex_lock(&id_priv->qp_mutex);
1221 if (!id_priv->id.qp) {
1222 ret = 0;
1223 goto out;
1224 }
1225
1226 qp_attr.qp_state = IB_QPS_ERR;
1227 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, IB_QP_STATE);
1228 out:
1229 mutex_unlock(&id_priv->qp_mutex);
1230 return ret;
1231 }
1232
1233 static int cma_ib_init_qp_attr(struct rdma_id_private *id_priv,
1234 struct ib_qp_attr *qp_attr, int *qp_attr_mask)
1235 {
1236 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
1237 int ret;
1238 u16 pkey;
1239
1240 if (rdma_cap_eth_ah(id_priv->id.device, id_priv->id.port_num))
1241 pkey = 0xffff;
1242 else
1243 pkey = ib_addr_get_pkey(dev_addr);
1244
1245 ret = ib_find_cached_pkey(id_priv->id.device, id_priv->id.port_num,
1246 pkey, &qp_attr->pkey_index);
1247 if (ret)
1248 return ret;
1249
1250 qp_attr->port_num = id_priv->id.port_num;
1251 *qp_attr_mask = IB_QP_STATE | IB_QP_PKEY_INDEX | IB_QP_PORT;
1252
1253 if (id_priv->id.qp_type == IB_QPT_UD) {
1254 ret = cma_set_default_qkey(id_priv);
1255 if (ret)
1256 return ret;
1257
1258 qp_attr->qkey = id_priv->qkey;
1259 *qp_attr_mask |= IB_QP_QKEY;
1260 } else {
1261 qp_attr->qp_access_flags = 0;
1262 *qp_attr_mask |= IB_QP_ACCESS_FLAGS;
1263 }
1264 return 0;
1265 }
1266
1267 int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
1268 int *qp_attr_mask)
1269 {
1270 struct rdma_id_private *id_priv;
1271 int ret = 0;
1272
1273 id_priv = container_of(id, struct rdma_id_private, id);
1274 if (rdma_cap_ib_cm(id->device, id->port_num)) {
1275 if (!id_priv->cm_id.ib || (id_priv->id.qp_type == IB_QPT_UD))
1276 ret = cma_ib_init_qp_attr(id_priv, qp_attr, qp_attr_mask);
1277 else
1278 ret = ib_cm_init_qp_attr(id_priv->cm_id.ib, qp_attr,
1279 qp_attr_mask);
1280
1281 if (qp_attr->qp_state == IB_QPS_RTR)
1282 qp_attr->rq_psn = id_priv->seq_num;
1283 } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
1284 if (!id_priv->cm_id.iw) {
1285 qp_attr->qp_access_flags = 0;
1286 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS;
1287 } else
1288 ret = iw_cm_init_qp_attr(id_priv->cm_id.iw, qp_attr,
1289 qp_attr_mask);
1290 qp_attr->port_num = id_priv->id.port_num;
1291 *qp_attr_mask |= IB_QP_PORT;
1292 } else {
1293 ret = -ENOSYS;
1294 }
1295
1296 if ((*qp_attr_mask & IB_QP_TIMEOUT) && id_priv->timeout_set)
1297 qp_attr->timeout = id_priv->timeout;
1298
1299 if ((*qp_attr_mask & IB_QP_MIN_RNR_TIMER) && id_priv->min_rnr_timer_set)
1300 qp_attr->min_rnr_timer = id_priv->min_rnr_timer;
1301
1302 return ret;
1303 }
1304 EXPORT_SYMBOL(rdma_init_qp_attr);
1305
1306 static inline bool cma_zero_addr(const struct sockaddr *addr)
1307 {
1308 switch (addr->sa_family) {
1309 case AF_INET:
1310 return ipv4_is_zeronet(((struct sockaddr_in *)addr)->sin_addr.s_addr);
1311 case AF_INET6:
1312 return ipv6_addr_any(&((struct sockaddr_in6 *)addr)->sin6_addr);
1313 case AF_IB:
1314 return ib_addr_any(&((struct sockaddr_ib *)addr)->sib_addr);
1315 default:
1316 return false;
1317 }
1318 }
1319
1320 static inline bool cma_loopback_addr(const struct sockaddr *addr)
1321 {
1322 switch (addr->sa_family) {
1323 case AF_INET:
1324 return ipv4_is_loopback(
1325 ((struct sockaddr_in *)addr)->sin_addr.s_addr);
1326 case AF_INET6:
1327 return ipv6_addr_loopback(
1328 &((struct sockaddr_in6 *)addr)->sin6_addr);
1329 case AF_IB:
1330 return ib_addr_loopback(
1331 &((struct sockaddr_ib *)addr)->sib_addr);
1332 default:
1333 return false;
1334 }
1335 }
1336
1337 static inline bool cma_any_addr(const struct sockaddr *addr)
1338 {
1339 return cma_zero_addr(addr) || cma_loopback_addr(addr);
1340 }
1341
1342 static int cma_addr_cmp(const struct sockaddr *src, const struct sockaddr *dst)
1343 {
1344 if (src->sa_family != dst->sa_family)
1345 return -1;
1346
1347 switch (src->sa_family) {
1348 case AF_INET:
1349 return ((struct sockaddr_in *)src)->sin_addr.s_addr !=
1350 ((struct sockaddr_in *)dst)->sin_addr.s_addr;
1351 case AF_INET6: {
1352 struct sockaddr_in6 *src_addr6 = (struct sockaddr_in6 *)src;
1353 struct sockaddr_in6 *dst_addr6 = (struct sockaddr_in6 *)dst;
1354 bool link_local;
1355
1356 if (ipv6_addr_cmp(&src_addr6->sin6_addr,
1357 &dst_addr6->sin6_addr))
1358 return 1;
1359 link_local = ipv6_addr_type(&dst_addr6->sin6_addr) &
1360 IPV6_ADDR_LINKLOCAL;
1361 /* Link local must match their scope_ids */
1362 return link_local ? (src_addr6->sin6_scope_id !=
1363 dst_addr6->sin6_scope_id) :
1364 0;
1365 }
1366
1367 default:
1368 return ib_addr_cmp(&((struct sockaddr_ib *) src)->sib_addr,
1369 &((struct sockaddr_ib *) dst)->sib_addr);
1370 }
1371 }
1372
1373 static __be16 cma_port(const struct sockaddr *addr)
1374 {
1375 struct sockaddr_ib *sib;
1376
1377 switch (addr->sa_family) {
1378 case AF_INET:
1379 return ((struct sockaddr_in *) addr)->sin_port;
1380 case AF_INET6:
1381 return ((struct sockaddr_in6 *) addr)->sin6_port;
1382 case AF_IB:
1383 sib = (struct sockaddr_ib *) addr;
1384 return htons((u16) (be64_to_cpu(sib->sib_sid) &
1385 be64_to_cpu(sib->sib_sid_mask)));
1386 default:
1387 return 0;
1388 }
1389 }
1390
1391 static inline int cma_any_port(const struct sockaddr *addr)
1392 {
1393 return !cma_port(addr);
1394 }
1395
1396 static void cma_save_ib_info(struct sockaddr *src_addr,
1397 struct sockaddr *dst_addr,
1398 const struct rdma_cm_id *listen_id,
1399 const struct sa_path_rec *path)
1400 {
1401 struct sockaddr_ib *listen_ib, *ib;
1402
1403 listen_ib = (struct sockaddr_ib *) &listen_id->route.addr.src_addr;
1404 if (src_addr) {
1405 ib = (struct sockaddr_ib *)src_addr;
1406 ib->sib_family = AF_IB;
1407 if (path) {
1408 ib->sib_pkey = path->pkey;
1409 ib->sib_flowinfo = path->flow_label;
1410 memcpy(&ib->sib_addr, &path->sgid, 16);
1411 ib->sib_sid = path->service_id;
1412 ib->sib_scope_id = 0;
1413 } else {
1414 ib->sib_pkey = listen_ib->sib_pkey;
1415 ib->sib_flowinfo = listen_ib->sib_flowinfo;
1416 ib->sib_addr = listen_ib->sib_addr;
1417 ib->sib_sid = listen_ib->sib_sid;
1418 ib->sib_scope_id = listen_ib->sib_scope_id;
1419 }
1420 ib->sib_sid_mask = cpu_to_be64(0xffffffffffffffffULL);
1421 }
1422 if (dst_addr) {
1423 ib = (struct sockaddr_ib *)dst_addr;
1424 ib->sib_family = AF_IB;
1425 if (path) {
1426 ib->sib_pkey = path->pkey;
1427 ib->sib_flowinfo = path->flow_label;
1428 memcpy(&ib->sib_addr, &path->dgid, 16);
1429 }
1430 }
1431 }
1432
1433 static void cma_save_ip4_info(struct sockaddr_in *src_addr,
1434 struct sockaddr_in *dst_addr,
1435 struct cma_hdr *hdr,
1436 __be16 local_port)
1437 {
1438 if (src_addr) {
1439 *src_addr = (struct sockaddr_in) {
1440 .sin_family = AF_INET,
1441 .sin_addr.s_addr = hdr->dst_addr.ip4.addr,
1442 .sin_port = local_port,
1443 };
1444 }
1445
1446 if (dst_addr) {
1447 *dst_addr = (struct sockaddr_in) {
1448 .sin_family = AF_INET,
1449 .sin_addr.s_addr = hdr->src_addr.ip4.addr,
1450 .sin_port = hdr->port,
1451 };
1452 }
1453 }
1454
1455 static void cma_save_ip6_info(struct sockaddr_in6 *src_addr,
1456 struct sockaddr_in6 *dst_addr,
1457 struct cma_hdr *hdr,
1458 __be16 local_port)
1459 {
1460 if (src_addr) {
1461 *src_addr = (struct sockaddr_in6) {
1462 .sin6_family = AF_INET6,
1463 .sin6_addr = hdr->dst_addr.ip6,
1464 .sin6_port = local_port,
1465 };
1466 }
1467
1468 if (dst_addr) {
1469 *dst_addr = (struct sockaddr_in6) {
1470 .sin6_family = AF_INET6,
1471 .sin6_addr = hdr->src_addr.ip6,
1472 .sin6_port = hdr->port,
1473 };
1474 }
1475 }
1476
1477 static u16 cma_port_from_service_id(__be64 service_id)
1478 {
1479 return (u16)be64_to_cpu(service_id);
1480 }
1481
1482 static int cma_save_ip_info(struct sockaddr *src_addr,
1483 struct sockaddr *dst_addr,
1484 const struct ib_cm_event *ib_event,
1485 __be64 service_id)
1486 {
1487 struct cma_hdr *hdr;
1488 __be16 port;
1489
1490 hdr = ib_event->private_data;
1491 if (hdr->cma_version != CMA_VERSION)
1492 return -EINVAL;
1493
1494 port = htons(cma_port_from_service_id(service_id));
1495
1496 switch (cma_get_ip_ver(hdr)) {
1497 case 4:
1498 cma_save_ip4_info((struct sockaddr_in *)src_addr,
1499 (struct sockaddr_in *)dst_addr, hdr, port);
1500 break;
1501 case 6:
1502 cma_save_ip6_info((struct sockaddr_in6 *)src_addr,
1503 (struct sockaddr_in6 *)dst_addr, hdr, port);
1504 break;
1505 default:
1506 return -EAFNOSUPPORT;
1507 }
1508
1509 return 0;
1510 }
1511
1512 static int cma_save_net_info(struct sockaddr *src_addr,
1513 struct sockaddr *dst_addr,
1514 const struct rdma_cm_id *listen_id,
1515 const struct ib_cm_event *ib_event,
1516 sa_family_t sa_family, __be64 service_id)
1517 {
1518 if (sa_family == AF_IB) {
1519 if (ib_event->event == IB_CM_REQ_RECEIVED)
1520 cma_save_ib_info(src_addr, dst_addr, listen_id,
1521 ib_event->param.req_rcvd.primary_path);
1522 else if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED)
1523 cma_save_ib_info(src_addr, dst_addr, listen_id, NULL);
1524 return 0;
1525 }
1526
1527 return cma_save_ip_info(src_addr, dst_addr, ib_event, service_id);
1528 }
1529
1530 static int cma_save_req_info(const struct ib_cm_event *ib_event,
1531 struct cma_req_info *req)
1532 {
1533 const struct ib_cm_req_event_param *req_param =
1534 &ib_event->param.req_rcvd;
1535 const struct ib_cm_sidr_req_event_param *sidr_param =
1536 &ib_event->param.sidr_req_rcvd;
1537
1538 switch (ib_event->event) {
1539 case IB_CM_REQ_RECEIVED:
1540 req->device = req_param->listen_id->device;
1541 req->port = req_param->port;
1542 memcpy(&req->local_gid, &req_param->primary_path->sgid,
1543 sizeof(req->local_gid));
1544 req->has_gid = true;
1545 req->service_id = req_param->primary_path->service_id;
1546 req->pkey = be16_to_cpu(req_param->primary_path->pkey);
1547 if (req->pkey != req_param->bth_pkey)
1548 pr_warn_ratelimited("RDMA CMA: got different BTH P_Key (0x%x) and primary path P_Key (0x%x)\n"
1549 "RDMA CMA: in the future this may cause the request to be dropped\n",
1550 req_param->bth_pkey, req->pkey);
1551 break;
1552 case IB_CM_SIDR_REQ_RECEIVED:
1553 req->device = sidr_param->listen_id->device;
1554 req->port = sidr_param->port;
1555 req->has_gid = false;
1556 req->service_id = sidr_param->service_id;
1557 req->pkey = sidr_param->pkey;
1558 if (req->pkey != sidr_param->bth_pkey)
1559 pr_warn_ratelimited("RDMA CMA: got different BTH P_Key (0x%x) and SIDR request payload P_Key (0x%x)\n"
1560 "RDMA CMA: in the future this may cause the request to be dropped\n",
1561 sidr_param->bth_pkey, req->pkey);
1562 break;
1563 default:
1564 return -EINVAL;
1565 }
1566
1567 return 0;
1568 }
1569
1570 static bool validate_ipv4_net_dev(struct net_device *net_dev,
1571 const struct sockaddr_in *dst_addr,
1572 const struct sockaddr_in *src_addr)
1573 {
1574 __be32 daddr = dst_addr->sin_addr.s_addr,
1575 saddr = src_addr->sin_addr.s_addr;
1576 struct fib_result res;
1577 struct flowi4 fl4;
1578 int err;
1579 bool ret;
1580
1581 if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) ||
1582 ipv4_is_lbcast(daddr) || ipv4_is_zeronet(saddr) ||
1583 ipv4_is_zeronet(daddr) || ipv4_is_loopback(daddr) ||
1584 ipv4_is_loopback(saddr))
1585 return false;
1586
1587 memset(&fl4, 0, sizeof(fl4));
1588 fl4.flowi4_oif = net_dev->ifindex;
1589 fl4.daddr = daddr;
1590 fl4.saddr = saddr;
1591
1592 rcu_read_lock();
1593 err = fib_lookup(dev_net(net_dev), &fl4, &res, 0);
1594 ret = err == 0 && FIB_RES_DEV(res) == net_dev;
1595 rcu_read_unlock();
1596
1597 return ret;
1598 }
1599
1600 static bool validate_ipv6_net_dev(struct net_device *net_dev,
1601 const struct sockaddr_in6 *dst_addr,
1602 const struct sockaddr_in6 *src_addr)
1603 {
1604 #if IS_ENABLED(CONFIG_IPV6)
1605 const int strict = ipv6_addr_type(&dst_addr->sin6_addr) &
1606 IPV6_ADDR_LINKLOCAL;
1607 struct rt6_info *rt = rt6_lookup(dev_net(net_dev), &dst_addr->sin6_addr,
1608 &src_addr->sin6_addr, net_dev->ifindex,
1609 NULL, strict);
1610 bool ret;
1611
1612 if (!rt)
1613 return false;
1614
1615 ret = rt->rt6i_idev->dev == net_dev;
1616 ip6_rt_put(rt);
1617
1618 return ret;
1619 #else
1620 return false;
1621 #endif
1622 }
1623
1624 static bool validate_net_dev(struct net_device *net_dev,
1625 const struct sockaddr *daddr,
1626 const struct sockaddr *saddr)
1627 {
1628 const struct sockaddr_in *daddr4 = (const struct sockaddr_in *)daddr;
1629 const struct sockaddr_in *saddr4 = (const struct sockaddr_in *)saddr;
1630 const struct sockaddr_in6 *daddr6 = (const struct sockaddr_in6 *)daddr;
1631 const struct sockaddr_in6 *saddr6 = (const struct sockaddr_in6 *)saddr;
1632
1633 switch (daddr->sa_family) {
1634 case AF_INET:
1635 return saddr->sa_family == AF_INET &&
1636 validate_ipv4_net_dev(net_dev, daddr4, saddr4);
1637
1638 case AF_INET6:
1639 return saddr->sa_family == AF_INET6 &&
1640 validate_ipv6_net_dev(net_dev, daddr6, saddr6);
1641
1642 default:
1643 return false;
1644 }
1645 }
1646
1647 static struct net_device *
1648 roce_get_net_dev_by_cm_event(const struct ib_cm_event *ib_event)
1649 {
1650 const struct ib_gid_attr *sgid_attr = NULL;
1651 struct net_device *ndev;
1652
1653 if (ib_event->event == IB_CM_REQ_RECEIVED)
1654 sgid_attr = ib_event->param.req_rcvd.ppath_sgid_attr;
1655 else if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED)
1656 sgid_attr = ib_event->param.sidr_req_rcvd.sgid_attr;
1657
1658 if (!sgid_attr)
1659 return NULL;
1660
1661 rcu_read_lock();
1662 ndev = rdma_read_gid_attr_ndev_rcu(sgid_attr);
1663 if (IS_ERR(ndev))
1664 ndev = NULL;
1665 else
1666 dev_hold(ndev);
1667 rcu_read_unlock();
1668 return ndev;
1669 }
1670
1671 static struct net_device *cma_get_net_dev(const struct ib_cm_event *ib_event,
1672 struct cma_req_info *req)
1673 {
1674 struct sockaddr *listen_addr =
1675 (struct sockaddr *)&req->listen_addr_storage;
1676 struct sockaddr *src_addr = (struct sockaddr *)&req->src_addr_storage;
1677 struct net_device *net_dev;
1678 const union ib_gid *gid = req->has_gid ? &req->local_gid : NULL;
1679 int err;
1680
1681 err = cma_save_ip_info(listen_addr, src_addr, ib_event,
1682 req->service_id);
1683 if (err)
1684 return ERR_PTR(err);
1685
1686 if (rdma_protocol_roce(req->device, req->port))
1687 net_dev = roce_get_net_dev_by_cm_event(ib_event);
1688 else
1689 net_dev = ib_get_net_dev_by_params(req->device, req->port,
1690 req->pkey,
1691 gid, listen_addr);
1692 if (!net_dev)
1693 return ERR_PTR(-ENODEV);
1694
1695 return net_dev;
1696 }
1697
1698 static enum rdma_ucm_port_space rdma_ps_from_service_id(__be64 service_id)
1699 {
1700 return (be64_to_cpu(service_id) >> 16) & 0xffff;
1701 }
1702
1703 static bool cma_match_private_data(struct rdma_id_private *id_priv,
1704 const struct cma_hdr *hdr)
1705 {
1706 struct sockaddr *addr = cma_src_addr(id_priv);
1707 __be32 ip4_addr;
1708 struct in6_addr ip6_addr;
1709
1710 if (cma_any_addr(addr) && !id_priv->afonly)
1711 return true;
1712
1713 switch (addr->sa_family) {
1714 case AF_INET:
1715 ip4_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
1716 if (cma_get_ip_ver(hdr) != 4)
1717 return false;
1718 if (!cma_any_addr(addr) &&
1719 hdr->dst_addr.ip4.addr != ip4_addr)
1720 return false;
1721 break;
1722 case AF_INET6:
1723 ip6_addr = ((struct sockaddr_in6 *)addr)->sin6_addr;
1724 if (cma_get_ip_ver(hdr) != 6)
1725 return false;
1726 if (!cma_any_addr(addr) &&
1727 memcmp(&hdr->dst_addr.ip6, &ip6_addr, sizeof(ip6_addr)))
1728 return false;
1729 break;
1730 case AF_IB:
1731 return true;
1732 default:
1733 return false;
1734 }
1735
1736 return true;
1737 }
1738
1739 static bool cma_protocol_roce(const struct rdma_cm_id *id)
1740 {
1741 struct ib_device *device = id->device;
1742 const u32 port_num = id->port_num ?: rdma_start_port(device);
1743
1744 return rdma_protocol_roce(device, port_num);
1745 }
1746
1747 static bool cma_is_req_ipv6_ll(const struct cma_req_info *req)
1748 {
1749 const struct sockaddr *daddr =
1750 (const struct sockaddr *)&req->listen_addr_storage;
1751 const struct sockaddr_in6 *daddr6 = (const struct sockaddr_in6 *)daddr;
1752
1753 /* Returns true if the req is for IPv6 link local */
1754 return (daddr->sa_family == AF_INET6 &&
1755 (ipv6_addr_type(&daddr6->sin6_addr) & IPV6_ADDR_LINKLOCAL));
1756 }
1757
1758 static bool cma_match_net_dev(const struct rdma_cm_id *id,
1759 const struct net_device *net_dev,
1760 const struct cma_req_info *req)
1761 {
1762 const struct rdma_addr *addr = &id->route.addr;
1763
1764 if (!net_dev)
1765 /* This request is an AF_IB request */
1766 return (!id->port_num || id->port_num == req->port) &&
1767 (addr->src_addr.ss_family == AF_IB);
1768
1769 /*
1770 * If the request is not for IPv6 link local, allow matching
1771 * request to any netdevice of the one or multiport rdma device.
1772 */
1773 if (!cma_is_req_ipv6_ll(req))
1774 return true;
1775 /*
1776 * Net namespaces must match, and if the listner is listening
1777 * on a specific netdevice than netdevice must match as well.
1778 */
1779 if (net_eq(dev_net(net_dev), addr->dev_addr.net) &&
1780 (!!addr->dev_addr.bound_dev_if ==
1781 (addr->dev_addr.bound_dev_if == net_dev->ifindex)))
1782 return true;
1783 else
1784 return false;
1785 }
1786
1787 static struct rdma_id_private *cma_find_listener(
1788 const struct rdma_bind_list *bind_list,
1789 const struct ib_cm_id *cm_id,
1790 const struct ib_cm_event *ib_event,
1791 const struct cma_req_info *req,
1792 const struct net_device *net_dev)
1793 {
1794 struct rdma_id_private *id_priv, *id_priv_dev;
1795
1796 lockdep_assert_held(&lock);
1797
1798 if (!bind_list)
1799 return ERR_PTR(-EINVAL);
1800
1801 hlist_for_each_entry(id_priv, &bind_list->owners, node) {
1802 if (cma_match_private_data(id_priv, ib_event->private_data)) {
1803 if (id_priv->id.device == cm_id->device &&
1804 cma_match_net_dev(&id_priv->id, net_dev, req))
1805 return id_priv;
1806 list_for_each_entry(id_priv_dev,
1807 &id_priv->listen_list,
1808 listen_item) {
1809 if (id_priv_dev->id.device == cm_id->device &&
1810 cma_match_net_dev(&id_priv_dev->id,
1811 net_dev, req))
1812 return id_priv_dev;
1813 }
1814 }
1815 }
1816
1817 return ERR_PTR(-EINVAL);
1818 }
1819
1820 static struct rdma_id_private *
1821 cma_ib_id_from_event(struct ib_cm_id *cm_id,
1822 const struct ib_cm_event *ib_event,
1823 struct cma_req_info *req,
1824 struct net_device **net_dev)
1825 {
1826 struct rdma_bind_list *bind_list;
1827 struct rdma_id_private *id_priv;
1828 int err;
1829
1830 err = cma_save_req_info(ib_event, req);
1831 if (err)
1832 return ERR_PTR(err);
1833
1834 *net_dev = cma_get_net_dev(ib_event, req);
1835 if (IS_ERR(*net_dev)) {
1836 if (PTR_ERR(*net_dev) == -EAFNOSUPPORT) {
1837 /* Assuming the protocol is AF_IB */
1838 *net_dev = NULL;
1839 } else {
1840 return ERR_CAST(*net_dev);
1841 }
1842 }
1843
1844 mutex_lock(&lock);
1845 /*
1846 * Net namespace might be getting deleted while route lookup,
1847 * cm_id lookup is in progress. Therefore, perform netdevice
1848 * validation, cm_id lookup under rcu lock.
1849 * RCU lock along with netdevice state check, synchronizes with
1850 * netdevice migrating to different net namespace and also avoids
1851 * case where net namespace doesn't get deleted while lookup is in
1852 * progress.
1853 * If the device state is not IFF_UP, its properties such as ifindex
1854 * and nd_net cannot be trusted to remain valid without rcu lock.
1855 * net/core/dev.c change_net_namespace() ensures to synchronize with
1856 * ongoing operations on net device after device is closed using
1857 * synchronize_net().
1858 */
1859 rcu_read_lock();
1860 if (*net_dev) {
1861 /*
1862 * If netdevice is down, it is likely that it is administratively
1863 * down or it might be migrating to different namespace.
1864 * In that case avoid further processing, as the net namespace
1865 * or ifindex may change.
1866 */
1867 if (((*net_dev)->flags & IFF_UP) == 0) {
1868 id_priv = ERR_PTR(-EHOSTUNREACH);
1869 goto err;
1870 }
1871
1872 if (!validate_net_dev(*net_dev,
1873 (struct sockaddr *)&req->src_addr_storage,
1874 (struct sockaddr *)&req->listen_addr_storage)) {
1875 id_priv = ERR_PTR(-EHOSTUNREACH);
1876 goto err;
1877 }
1878 }
1879
1880 bind_list = cma_ps_find(*net_dev ? dev_net(*net_dev) : &init_net,
1881 rdma_ps_from_service_id(req->service_id),
1882 cma_port_from_service_id(req->service_id));
1883 id_priv = cma_find_listener(bind_list, cm_id, ib_event, req, *net_dev);
1884 err:
1885 rcu_read_unlock();
1886 mutex_unlock(&lock);
1887 if (IS_ERR(id_priv) && *net_dev) {
1888 dev_put(*net_dev);
1889 *net_dev = NULL;
1890 }
1891 return id_priv;
1892 }
1893
1894 static inline u8 cma_user_data_offset(struct rdma_id_private *id_priv)
1895 {
1896 return cma_family(id_priv) == AF_IB ? 0 : sizeof(struct cma_hdr);
1897 }
1898
1899 static void cma_cancel_route(struct rdma_id_private *id_priv)
1900 {
1901 if (rdma_cap_ib_sa(id_priv->id.device, id_priv->id.port_num)) {
1902 if (id_priv->query)
1903 ib_sa_cancel_query(id_priv->query_id, id_priv->query);
1904 }
1905 }
1906
1907 static void _cma_cancel_listens(struct rdma_id_private *id_priv)
1908 {
1909 struct rdma_id_private *dev_id_priv;
1910
1911 lockdep_assert_held(&lock);
1912
1913 /*
1914 * Remove from listen_any_list to prevent added devices from spawning
1915 * additional listen requests.
1916 */
1917 list_del_init(&id_priv->listen_any_item);
1918
1919 while (!list_empty(&id_priv->listen_list)) {
1920 dev_id_priv =
1921 list_first_entry(&id_priv->listen_list,
1922 struct rdma_id_private, listen_item);
1923 /* sync with device removal to avoid duplicate destruction */
1924 list_del_init(&dev_id_priv->device_item);
1925 list_del_init(&dev_id_priv->listen_item);
1926 mutex_unlock(&lock);
1927
1928 rdma_destroy_id(&dev_id_priv->id);
1929 mutex_lock(&lock);
1930 }
1931 }
1932
1933 static void cma_cancel_listens(struct rdma_id_private *id_priv)
1934 {
1935 mutex_lock(&lock);
1936 _cma_cancel_listens(id_priv);
1937 mutex_unlock(&lock);
1938 }
1939
1940 static void cma_cancel_operation(struct rdma_id_private *id_priv,
1941 enum rdma_cm_state state)
1942 {
1943 switch (state) {
1944 case RDMA_CM_ADDR_QUERY:
1945 /*
1946 * We can avoid doing the rdma_addr_cancel() based on state,
1947 * only RDMA_CM_ADDR_QUERY has a work that could still execute.
1948 * Notice that the addr_handler work could still be exiting
1949 * outside this state, however due to the interaction with the
1950 * handler_mutex the work is guaranteed not to touch id_priv
1951 * during exit.
1952 */
1953 rdma_addr_cancel(&id_priv->id.route.addr.dev_addr);
1954 break;
1955 case RDMA_CM_ROUTE_QUERY:
1956 cma_cancel_route(id_priv);
1957 break;
1958 case RDMA_CM_LISTEN:
1959 if (cma_any_addr(cma_src_addr(id_priv)) && !id_priv->cma_dev)
1960 cma_cancel_listens(id_priv);
1961 break;
1962 default:
1963 break;
1964 }
1965 }
1966
1967 static void cma_release_port(struct rdma_id_private *id_priv)
1968 {
1969 struct rdma_bind_list *bind_list = id_priv->bind_list;
1970 struct net *net = id_priv->id.route.addr.dev_addr.net;
1971
1972 if (!bind_list)
1973 return;
1974
1975 mutex_lock(&lock);
1976 hlist_del(&id_priv->node);
1977 if (hlist_empty(&bind_list->owners)) {
1978 cma_ps_remove(net, bind_list->ps, bind_list->port);
1979 kfree(bind_list);
1980 }
1981 mutex_unlock(&lock);
1982 }
1983
1984 static void destroy_mc(struct rdma_id_private *id_priv,
1985 struct cma_multicast *mc)
1986 {
1987 bool send_only = mc->join_state == BIT(SENDONLY_FULLMEMBER_JOIN);
1988
1989 if (rdma_cap_ib_mcast(id_priv->id.device, id_priv->id.port_num))
1990 ib_sa_free_multicast(mc->sa_mc);
1991
1992 if (rdma_protocol_roce(id_priv->id.device, id_priv->id.port_num)) {
1993 struct rdma_dev_addr *dev_addr =
1994 &id_priv->id.route.addr.dev_addr;
1995 struct net_device *ndev = NULL;
1996
1997 if (dev_addr->bound_dev_if)
1998 ndev = dev_get_by_index(dev_addr->net,
1999 dev_addr->bound_dev_if);
2000 if (ndev && !send_only) {
2001 enum ib_gid_type gid_type;
2002 union ib_gid mgid;
2003
2004 gid_type = id_priv->cma_dev->default_gid_type
2005 [id_priv->id.port_num -
2006 rdma_start_port(
2007 id_priv->cma_dev->device)];
2008 cma_iboe_set_mgid((struct sockaddr *)&mc->addr, &mgid,
2009 gid_type);
2010 cma_igmp_send(ndev, &mgid, false);
2011 }
2012 dev_put(ndev);
2013
2014 cancel_work_sync(&mc->iboe_join.work);
2015 }
2016 kfree(mc);
2017 }
2018
2019 static void cma_leave_mc_groups(struct rdma_id_private *id_priv)
2020 {
2021 struct cma_multicast *mc;
2022
2023 while (!list_empty(&id_priv->mc_list)) {
2024 mc = list_first_entry(&id_priv->mc_list, struct cma_multicast,
2025 list);
2026 list_del(&mc->list);
2027 destroy_mc(id_priv, mc);
2028 }
2029 }
2030
2031 static void _destroy_id(struct rdma_id_private *id_priv,
2032 enum rdma_cm_state state)
2033 {
2034 cma_cancel_operation(id_priv, state);
2035
2036 rdma_restrack_del(&id_priv->res);
2037 cma_remove_id_from_tree(id_priv);
2038 if (id_priv->cma_dev) {
2039 if (rdma_cap_ib_cm(id_priv->id.device, 1)) {
2040 if (id_priv->cm_id.ib)
2041 ib_destroy_cm_id(id_priv->cm_id.ib);
2042 } else if (rdma_cap_iw_cm(id_priv->id.device, 1)) {
2043 if (id_priv->cm_id.iw)
2044 iw_destroy_cm_id(id_priv->cm_id.iw);
2045 }
2046 cma_leave_mc_groups(id_priv);
2047 cma_release_dev(id_priv);
2048 }
2049
2050 cma_release_port(id_priv);
2051 cma_id_put(id_priv);
2052 wait_for_completion(&id_priv->comp);
2053
2054 if (id_priv->internal_id)
2055 cma_id_put(id_priv->id.context);
2056
2057 kfree(id_priv->id.route.path_rec);
2058 kfree(id_priv->id.route.path_rec_inbound);
2059 kfree(id_priv->id.route.path_rec_outbound);
2060
2061 put_net(id_priv->id.route.addr.dev_addr.net);
2062 kfree(id_priv);
2063 }
2064
2065 /*
2066 * destroy an ID from within the handler_mutex. This ensures that no other
2067 * handlers can start running concurrently.
2068 */
2069 static void destroy_id_handler_unlock(struct rdma_id_private *id_priv)
2070 __releases(&idprv->handler_mutex)
2071 {
2072 enum rdma_cm_state state;
2073 unsigned long flags;
2074
2075 trace_cm_id_destroy(id_priv);
2076
2077 /*
2078 * Setting the state to destroyed under the handler mutex provides a
2079 * fence against calling handler callbacks. If this is invoked due to
2080 * the failure of a handler callback then it guarentees that no future
2081 * handlers will be called.
2082 */
2083 lockdep_assert_held(&id_priv->handler_mutex);
2084 spin_lock_irqsave(&id_priv->lock, flags);
2085 state = id_priv->state;
2086 id_priv->state = RDMA_CM_DESTROYING;
2087 spin_unlock_irqrestore(&id_priv->lock, flags);
2088 mutex_unlock(&id_priv->handler_mutex);
2089 _destroy_id(id_priv, state);
2090 }
2091
2092 void rdma_destroy_id(struct rdma_cm_id *id)
2093 {
2094 struct rdma_id_private *id_priv =
2095 container_of(id, struct rdma_id_private, id);
2096
2097 mutex_lock(&id_priv->handler_mutex);
2098 destroy_id_handler_unlock(id_priv);
2099 }
2100 EXPORT_SYMBOL(rdma_destroy_id);
2101
2102 static int cma_rep_recv(struct rdma_id_private *id_priv)
2103 {
2104 int ret;
2105
2106 ret = cma_modify_qp_rtr(id_priv, NULL);
2107 if (ret)
2108 goto reject;
2109
2110 ret = cma_modify_qp_rts(id_priv, NULL);
2111 if (ret)
2112 goto reject;
2113
2114 trace_cm_send_rtu(id_priv);
2115 ret = ib_send_cm_rtu(id_priv->cm_id.ib, NULL, 0);
2116 if (ret)
2117 goto reject;
2118
2119 return 0;
2120 reject:
2121 pr_debug_ratelimited("RDMA CM: CONNECT_ERROR: failed to handle reply. status %d\n", ret);
2122 cma_modify_qp_err(id_priv);
2123 trace_cm_send_rej(id_priv);
2124 ib_send_cm_rej(id_priv->cm_id.ib, IB_CM_REJ_CONSUMER_DEFINED,
2125 NULL, 0, NULL, 0);
2126 return ret;
2127 }
2128
2129 static void cma_set_rep_event_data(struct rdma_cm_event *event,
2130 const struct ib_cm_rep_event_param *rep_data,
2131 void *private_data)
2132 {
2133 event->param.conn.private_data = private_data;
2134 event->param.conn.private_data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
2135 event->param.conn.responder_resources = rep_data->responder_resources;
2136 event->param.conn.initiator_depth = rep_data->initiator_depth;
2137 event->param.conn.flow_control = rep_data->flow_control;
2138 event->param.conn.rnr_retry_count = rep_data->rnr_retry_count;
2139 event->param.conn.srq = rep_data->srq;
2140 event->param.conn.qp_num = rep_data->remote_qpn;
2141
2142 event->ece.vendor_id = rep_data->ece.vendor_id;
2143 event->ece.attr_mod = rep_data->ece.attr_mod;
2144 }
2145
2146 static int cma_cm_event_handler(struct rdma_id_private *id_priv,
2147 struct rdma_cm_event *event)
2148 {
2149 int ret;
2150
2151 lockdep_assert_held(&id_priv->handler_mutex);
2152
2153 trace_cm_event_handler(id_priv, event);
2154 ret = id_priv->id.event_handler(&id_priv->id, event);
2155 trace_cm_event_done(id_priv, event, ret);
2156 return ret;
2157 }
2158
2159 static int cma_ib_handler(struct ib_cm_id *cm_id,
2160 const struct ib_cm_event *ib_event)
2161 {
2162 struct rdma_id_private *id_priv = cm_id->context;
2163 struct rdma_cm_event event = {};
2164 enum rdma_cm_state state;
2165 int ret;
2166
2167 mutex_lock(&id_priv->handler_mutex);
2168 state = READ_ONCE(id_priv->state);
2169 if ((ib_event->event != IB_CM_TIMEWAIT_EXIT &&
2170 state != RDMA_CM_CONNECT) ||
2171 (ib_event->event == IB_CM_TIMEWAIT_EXIT &&
2172 state != RDMA_CM_DISCONNECT))
2173 goto out;
2174
2175 switch (ib_event->event) {
2176 case IB_CM_REQ_ERROR:
2177 case IB_CM_REP_ERROR:
2178 event.event = RDMA_CM_EVENT_UNREACHABLE;
2179 event.status = -ETIMEDOUT;
2180 break;
2181 case IB_CM_REP_RECEIVED:
2182 if (state == RDMA_CM_CONNECT &&
2183 (id_priv->id.qp_type != IB_QPT_UD)) {
2184 trace_cm_send_mra(id_priv);
2185 ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0);
2186 }
2187 if (id_priv->id.qp) {
2188 event.status = cma_rep_recv(id_priv);
2189 event.event = event.status ? RDMA_CM_EVENT_CONNECT_ERROR :
2190 RDMA_CM_EVENT_ESTABLISHED;
2191 } else {
2192 event.event = RDMA_CM_EVENT_CONNECT_RESPONSE;
2193 }
2194 cma_set_rep_event_data(&event, &ib_event->param.rep_rcvd,
2195 ib_event->private_data);
2196 break;
2197 case IB_CM_RTU_RECEIVED:
2198 case IB_CM_USER_ESTABLISHED:
2199 event.event = RDMA_CM_EVENT_ESTABLISHED;
2200 break;
2201 case IB_CM_DREQ_ERROR:
2202 event.status = -ETIMEDOUT;
2203 fallthrough;
2204 case IB_CM_DREQ_RECEIVED:
2205 case IB_CM_DREP_RECEIVED:
2206 if (!cma_comp_exch(id_priv, RDMA_CM_CONNECT,
2207 RDMA_CM_DISCONNECT))
2208 goto out;
2209 event.event = RDMA_CM_EVENT_DISCONNECTED;
2210 break;
2211 case IB_CM_TIMEWAIT_EXIT:
2212 event.event = RDMA_CM_EVENT_TIMEWAIT_EXIT;
2213 break;
2214 case IB_CM_MRA_RECEIVED:
2215 /* ignore event */
2216 goto out;
2217 case IB_CM_REJ_RECEIVED:
2218 pr_debug_ratelimited("RDMA CM: REJECTED: %s\n", rdma_reject_msg(&id_priv->id,
2219 ib_event->param.rej_rcvd.reason));
2220 cma_modify_qp_err(id_priv);
2221 event.status = ib_event->param.rej_rcvd.reason;
2222 event.event = RDMA_CM_EVENT_REJECTED;
2223 event.param.conn.private_data = ib_event->private_data;
2224 event.param.conn.private_data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
2225 break;
2226 default:
2227 pr_err("RDMA CMA: unexpected IB CM event: %d\n",
2228 ib_event->event);
2229 goto out;
2230 }
2231
2232 ret = cma_cm_event_handler(id_priv, &event);
2233 if (ret) {
2234 /* Destroy the CM ID by returning a non-zero value. */
2235 id_priv->cm_id.ib = NULL;
2236 destroy_id_handler_unlock(id_priv);
2237 return ret;
2238 }
2239 out:
2240 mutex_unlock(&id_priv->handler_mutex);
2241 return 0;
2242 }
2243
2244 static struct rdma_id_private *
2245 cma_ib_new_conn_id(const struct rdma_cm_id *listen_id,
2246 const struct ib_cm_event *ib_event,
2247 struct net_device *net_dev)
2248 {
2249 struct rdma_id_private *listen_id_priv;
2250 struct rdma_id_private *id_priv;
2251 struct rdma_cm_id *id;
2252 struct rdma_route *rt;
2253 const sa_family_t ss_family = listen_id->route.addr.src_addr.ss_family;
2254 struct sa_path_rec *path = ib_event->param.req_rcvd.primary_path;
2255 const __be64 service_id =
2256 ib_event->param.req_rcvd.primary_path->service_id;
2257 int ret;
2258
2259 listen_id_priv = container_of(listen_id, struct rdma_id_private, id);
2260 id_priv = __rdma_create_id(listen_id->route.addr.dev_addr.net,
2261 listen_id->event_handler, listen_id->context,
2262 listen_id->ps,
2263 ib_event->param.req_rcvd.qp_type,
2264 listen_id_priv);
2265 if (IS_ERR(id_priv))
2266 return NULL;
2267
2268 id = &id_priv->id;
2269 if (cma_save_net_info((struct sockaddr *)&id->route.addr.src_addr,
2270 (struct sockaddr *)&id->route.addr.dst_addr,
2271 listen_id, ib_event, ss_family, service_id))
2272 goto err;
2273
2274 rt = &id->route;
2275 rt->num_pri_alt_paths = ib_event->param.req_rcvd.alternate_path ? 2 : 1;
2276 rt->path_rec = kmalloc_array(rt->num_pri_alt_paths,
2277 sizeof(*rt->path_rec), GFP_KERNEL);
2278 if (!rt->path_rec)
2279 goto err;
2280
2281 rt->path_rec[0] = *path;
2282 if (rt->num_pri_alt_paths == 2)
2283 rt->path_rec[1] = *ib_event->param.req_rcvd.alternate_path;
2284
2285 if (net_dev) {
2286 rdma_copy_src_l2_addr(&rt->addr.dev_addr, net_dev);
2287 } else {
2288 if (!cma_protocol_roce(listen_id) &&
2289 cma_any_addr(cma_src_addr(id_priv))) {
2290 rt->addr.dev_addr.dev_type = ARPHRD_INFINIBAND;
2291 rdma_addr_set_sgid(&rt->addr.dev_addr, &rt->path_rec[0].sgid);
2292 ib_addr_set_pkey(&rt->addr.dev_addr, be16_to_cpu(rt->path_rec[0].pkey));
2293 } else if (!cma_any_addr(cma_src_addr(id_priv))) {
2294 ret = cma_translate_addr(cma_src_addr(id_priv), &rt->addr.dev_addr);
2295 if (ret)
2296 goto err;
2297 }
2298 }
2299 rdma_addr_set_dgid(&rt->addr.dev_addr, &rt->path_rec[0].dgid);
2300
2301 id_priv->state = RDMA_CM_CONNECT;
2302 return id_priv;
2303
2304 err:
2305 rdma_destroy_id(id);
2306 return NULL;
2307 }
2308
2309 static struct rdma_id_private *
2310 cma_ib_new_udp_id(const struct rdma_cm_id *listen_id,
2311 const struct ib_cm_event *ib_event,
2312 struct net_device *net_dev)
2313 {
2314 const struct rdma_id_private *listen_id_priv;
2315 struct rdma_id_private *id_priv;
2316 struct rdma_cm_id *id;
2317 const sa_family_t ss_family = listen_id->route.addr.src_addr.ss_family;
2318 struct net *net = listen_id->route.addr.dev_addr.net;
2319 int ret;
2320
2321 listen_id_priv = container_of(listen_id, struct rdma_id_private, id);
2322 id_priv = __rdma_create_id(net, listen_id->event_handler,
2323 listen_id->context, listen_id->ps, IB_QPT_UD,
2324 listen_id_priv);
2325 if (IS_ERR(id_priv))
2326 return NULL;
2327
2328 id = &id_priv->id;
2329 if (cma_save_net_info((struct sockaddr *)&id->route.addr.src_addr,
2330 (struct sockaddr *)&id->route.addr.dst_addr,
2331 listen_id, ib_event, ss_family,
2332 ib_event->param.sidr_req_rcvd.service_id))
2333 goto err;
2334
2335 if (net_dev) {
2336 rdma_copy_src_l2_addr(&id->route.addr.dev_addr, net_dev);
2337 } else {
2338 if (!cma_any_addr(cma_src_addr(id_priv))) {
2339 ret = cma_translate_addr(cma_src_addr(id_priv),
2340 &id->route.addr.dev_addr);
2341 if (ret)
2342 goto err;
2343 }
2344 }
2345
2346 id_priv->state = RDMA_CM_CONNECT;
2347 return id_priv;
2348 err:
2349 rdma_destroy_id(id);
2350 return NULL;
2351 }
2352
2353 static void cma_set_req_event_data(struct rdma_cm_event *event,
2354 const struct ib_cm_req_event_param *req_data,
2355 void *private_data, int offset)
2356 {
2357 event->param.conn.private_data = private_data + offset;
2358 event->param.conn.private_data_len = IB_CM_REQ_PRIVATE_DATA_SIZE - offset;
2359 event->param.conn.responder_resources = req_data->responder_resources;
2360 event->param.conn.initiator_depth = req_data->initiator_depth;
2361 event->param.conn.flow_control = req_data->flow_control;
2362 event->param.conn.retry_count = req_data->retry_count;
2363 event->param.conn.rnr_retry_count = req_data->rnr_retry_count;
2364 event->param.conn.srq = req_data->srq;
2365 event->param.conn.qp_num = req_data->remote_qpn;
2366
2367 event->ece.vendor_id = req_data->ece.vendor_id;
2368 event->ece.attr_mod = req_data->ece.attr_mod;
2369 }
2370
2371 static int cma_ib_check_req_qp_type(const struct rdma_cm_id *id,
2372 const struct ib_cm_event *ib_event)
2373 {
2374 return (((ib_event->event == IB_CM_REQ_RECEIVED) &&
2375 (ib_event->param.req_rcvd.qp_type == id->qp_type)) ||
2376 ((ib_event->event == IB_CM_SIDR_REQ_RECEIVED) &&
2377 (id->qp_type == IB_QPT_UD)) ||
2378 (!id->qp_type));
2379 }
2380
2381 static int cma_ib_req_handler(struct ib_cm_id *cm_id,
2382 const struct ib_cm_event *ib_event)
2383 {
2384 struct rdma_id_private *listen_id, *conn_id = NULL;
2385 struct rdma_cm_event event = {};
2386 struct cma_req_info req = {};
2387 struct net_device *net_dev;
2388 u8 offset;
2389 int ret;
2390
2391 listen_id = cma_ib_id_from_event(cm_id, ib_event, &req, &net_dev);
2392 if (IS_ERR(listen_id))
2393 return PTR_ERR(listen_id);
2394
2395 trace_cm_req_handler(listen_id, ib_event->event);
2396 if (!cma_ib_check_req_qp_type(&listen_id->id, ib_event)) {
2397 ret = -EINVAL;
2398 goto net_dev_put;
2399 }
2400
2401 mutex_lock(&listen_id->handler_mutex);
2402 if (READ_ONCE(listen_id->state) != RDMA_CM_LISTEN) {
2403 ret = -ECONNABORTED;
2404 goto err_unlock;
2405 }
2406
2407 offset = cma_user_data_offset(listen_id);
2408 event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
2409 if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED) {
2410 conn_id = cma_ib_new_udp_id(&listen_id->id, ib_event, net_dev);
2411 event.param.ud.private_data = ib_event->private_data + offset;
2412 event.param.ud.private_data_len =
2413 IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE - offset;
2414 } else {
2415 conn_id = cma_ib_new_conn_id(&listen_id->id, ib_event, net_dev);
2416 cma_set_req_event_data(&event, &ib_event->param.req_rcvd,
2417 ib_event->private_data, offset);
2418 }
2419 if (!conn_id) {
2420 ret = -ENOMEM;
2421 goto err_unlock;
2422 }
2423
2424 mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
2425 ret = cma_ib_acquire_dev(conn_id, listen_id, &req);
2426 if (ret) {
2427 destroy_id_handler_unlock(conn_id);
2428 goto err_unlock;
2429 }
2430
2431 conn_id->cm_id.ib = cm_id;
2432 cm_id->context = conn_id;
2433 cm_id->cm_handler = cma_ib_handler;
2434
2435 ret = cma_cm_event_handler(conn_id, &event);
2436 if (ret) {
2437 /* Destroy the CM ID by returning a non-zero value. */
2438 conn_id->cm_id.ib = NULL;
2439 mutex_unlock(&listen_id->handler_mutex);
2440 destroy_id_handler_unlock(conn_id);
2441 goto net_dev_put;
2442 }
2443
2444 if (READ_ONCE(conn_id->state) == RDMA_CM_CONNECT &&
2445 conn_id->id.qp_type != IB_QPT_UD) {
2446 trace_cm_send_mra(cm_id->context);
2447 ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0);
2448 }
2449 mutex_unlock(&conn_id->handler_mutex);
2450
2451 err_unlock:
2452 mutex_unlock(&listen_id->handler_mutex);
2453
2454 net_dev_put:
2455 dev_put(net_dev);
2456
2457 return ret;
2458 }
2459
2460 __be64 rdma_get_service_id(struct rdma_cm_id *id, struct sockaddr *addr)
2461 {
2462 if (addr->sa_family == AF_IB)
2463 return ((struct sockaddr_ib *) addr)->sib_sid;
2464
2465 return cpu_to_be64(((u64)id->ps << 16) + be16_to_cpu(cma_port(addr)));
2466 }
2467 EXPORT_SYMBOL(rdma_get_service_id);
2468
2469 void rdma_read_gids(struct rdma_cm_id *cm_id, union ib_gid *sgid,
2470 union ib_gid *dgid)
2471 {
2472 struct rdma_addr *addr = &cm_id->route.addr;
2473
2474 if (!cm_id->device) {
2475 if (sgid)
2476 memset(sgid, 0, sizeof(*sgid));
2477 if (dgid)
2478 memset(dgid, 0, sizeof(*dgid));
2479 return;
2480 }
2481
2482 if (rdma_protocol_roce(cm_id->device, cm_id->port_num)) {
2483 if (sgid)
2484 rdma_ip2gid((struct sockaddr *)&addr->src_addr, sgid);
2485 if (dgid)
2486 rdma_ip2gid((struct sockaddr *)&addr->dst_addr, dgid);
2487 } else {
2488 if (sgid)
2489 rdma_addr_get_sgid(&addr->dev_addr, sgid);
2490 if (dgid)
2491 rdma_addr_get_dgid(&addr->dev_addr, dgid);
2492 }
2493 }
2494 EXPORT_SYMBOL(rdma_read_gids);
2495
2496 static int cma_iw_handler(struct iw_cm_id *iw_id, struct iw_cm_event *iw_event)
2497 {
2498 struct rdma_id_private *id_priv = iw_id->context;
2499 struct rdma_cm_event event = {};
2500 int ret = 0;
2501 struct sockaddr *laddr = (struct sockaddr *)&iw_event->local_addr;
2502 struct sockaddr *raddr = (struct sockaddr *)&iw_event->remote_addr;
2503
2504 mutex_lock(&id_priv->handler_mutex);
2505 if (READ_ONCE(id_priv->state) != RDMA_CM_CONNECT)
2506 goto out;
2507
2508 switch (iw_event->event) {
2509 case IW_CM_EVENT_CLOSE:
2510 event.event = RDMA_CM_EVENT_DISCONNECTED;
2511 break;
2512 case IW_CM_EVENT_CONNECT_REPLY:
2513 memcpy(cma_src_addr(id_priv), laddr,
2514 rdma_addr_size(laddr));
2515 memcpy(cma_dst_addr(id_priv), raddr,
2516 rdma_addr_size(raddr));
2517 switch (iw_event->status) {
2518 case 0:
2519 event.event = RDMA_CM_EVENT_ESTABLISHED;
2520 event.param.conn.initiator_depth = iw_event->ird;
2521 event.param.conn.responder_resources = iw_event->ord;
2522 break;
2523 case -ECONNRESET:
2524 case -ECONNREFUSED:
2525 event.event = RDMA_CM_EVENT_REJECTED;
2526 break;
2527 case -ETIMEDOUT:
2528 event.event = RDMA_CM_EVENT_UNREACHABLE;
2529 break;
2530 default:
2531 event.event = RDMA_CM_EVENT_CONNECT_ERROR;
2532 break;
2533 }
2534 break;
2535 case IW_CM_EVENT_ESTABLISHED:
2536 event.event = RDMA_CM_EVENT_ESTABLISHED;
2537 event.param.conn.initiator_depth = iw_event->ird;
2538 event.param.conn.responder_resources = iw_event->ord;
2539 break;
2540 default:
2541 goto out;
2542 }
2543
2544 event.status = iw_event->status;
2545 event.param.conn.private_data = iw_event->private_data;
2546 event.param.conn.private_data_len = iw_event->private_data_len;
2547 ret = cma_cm_event_handler(id_priv, &event);
2548 if (ret) {
2549 /* Destroy the CM ID by returning a non-zero value. */
2550 id_priv->cm_id.iw = NULL;
2551 destroy_id_handler_unlock(id_priv);
2552 return ret;
2553 }
2554
2555 out:
2556 mutex_unlock(&id_priv->handler_mutex);
2557 return ret;
2558 }
2559
2560 static int iw_conn_req_handler(struct iw_cm_id *cm_id,
2561 struct iw_cm_event *iw_event)
2562 {
2563 struct rdma_id_private *listen_id, *conn_id;
2564 struct rdma_cm_event event = {};
2565 int ret = -ECONNABORTED;
2566 struct sockaddr *laddr = (struct sockaddr *)&iw_event->local_addr;
2567 struct sockaddr *raddr = (struct sockaddr *)&iw_event->remote_addr;
2568
2569 event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
2570 event.param.conn.private_data = iw_event->private_data;
2571 event.param.conn.private_data_len = iw_event->private_data_len;
2572 event.param.conn.initiator_depth = iw_event->ird;
2573 event.param.conn.responder_resources = iw_event->ord;
2574
2575 listen_id = cm_id->context;
2576
2577 mutex_lock(&listen_id->handler_mutex);
2578 if (READ_ONCE(listen_id->state) != RDMA_CM_LISTEN)
2579 goto out;
2580
2581 /* Create a new RDMA id for the new IW CM ID */
2582 conn_id = __rdma_create_id(listen_id->id.route.addr.dev_addr.net,
2583 listen_id->id.event_handler,
2584 listen_id->id.context, RDMA_PS_TCP,
2585 IB_QPT_RC, listen_id);
2586 if (IS_ERR(conn_id)) {
2587 ret = -ENOMEM;
2588 goto out;
2589 }
2590 mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
2591 conn_id->state = RDMA_CM_CONNECT;
2592
2593 ret = rdma_translate_ip(laddr, &conn_id->id.route.addr.dev_addr);
2594 if (ret) {
2595 mutex_unlock(&listen_id->handler_mutex);
2596 destroy_id_handler_unlock(conn_id);
2597 return ret;
2598 }
2599
2600 ret = cma_iw_acquire_dev(conn_id, listen_id);
2601 if (ret) {
2602 mutex_unlock(&listen_id->handler_mutex);
2603 destroy_id_handler_unlock(conn_id);
2604 return ret;
2605 }
2606
2607 conn_id->cm_id.iw = cm_id;
2608 cm_id->context = conn_id;
2609 cm_id->cm_handler = cma_iw_handler;
2610
2611 memcpy(cma_src_addr(conn_id), laddr, rdma_addr_size(laddr));
2612 memcpy(cma_dst_addr(conn_id), raddr, rdma_addr_size(raddr));
2613
2614 ret = cma_cm_event_handler(conn_id, &event);
2615 if (ret) {
2616 /* User wants to destroy the CM ID */
2617 conn_id->cm_id.iw = NULL;
2618 mutex_unlock(&listen_id->handler_mutex);
2619 destroy_id_handler_unlock(conn_id);
2620 return ret;
2621 }
2622
2623 mutex_unlock(&conn_id->handler_mutex);
2624
2625 out:
2626 mutex_unlock(&listen_id->handler_mutex);
2627 return ret;
2628 }
2629
2630 static int cma_ib_listen(struct rdma_id_private *id_priv)
2631 {
2632 struct sockaddr *addr;
2633 struct ib_cm_id *id;
2634 __be64 svc_id;
2635
2636 addr = cma_src_addr(id_priv);
2637 svc_id = rdma_get_service_id(&id_priv->id, addr);
2638 id = ib_cm_insert_listen(id_priv->id.device,
2639 cma_ib_req_handler, svc_id);
2640 if (IS_ERR(id))
2641 return PTR_ERR(id);
2642 id_priv->cm_id.ib = id;
2643
2644 return 0;
2645 }
2646
2647 static int cma_iw_listen(struct rdma_id_private *id_priv, int backlog)
2648 {
2649 int ret;
2650 struct iw_cm_id *id;
2651
2652 id = iw_create_cm_id(id_priv->id.device,
2653 iw_conn_req_handler,
2654 id_priv);
2655 if (IS_ERR(id))
2656 return PTR_ERR(id);
2657
2658 mutex_lock(&id_priv->qp_mutex);
2659 id->tos = id_priv->tos;
2660 id->tos_set = id_priv->tos_set;
2661 mutex_unlock(&id_priv->qp_mutex);
2662 id->afonly = id_priv->afonly;
2663 id_priv->cm_id.iw = id;
2664
2665 memcpy(&id_priv->cm_id.iw->local_addr, cma_src_addr(id_priv),
2666 rdma_addr_size(cma_src_addr(id_priv)));
2667
2668 ret = iw_cm_listen(id_priv->cm_id.iw, backlog);
2669
2670 if (ret) {
2671 iw_destroy_cm_id(id_priv->cm_id.iw);
2672 id_priv->cm_id.iw = NULL;
2673 }
2674
2675 return ret;
2676 }
2677
2678 static int cma_listen_handler(struct rdma_cm_id *id,
2679 struct rdma_cm_event *event)
2680 {
2681 struct rdma_id_private *id_priv = id->context;
2682
2683 /* Listening IDs are always destroyed on removal */
2684 if (event->event == RDMA_CM_EVENT_DEVICE_REMOVAL)
2685 return -1;
2686
2687 id->context = id_priv->id.context;
2688 id->event_handler = id_priv->id.event_handler;
2689 trace_cm_event_handler(id_priv, event);
2690 return id_priv->id.event_handler(id, event);
2691 }
2692
2693 static int cma_listen_on_dev(struct rdma_id_private *id_priv,
2694 struct cma_device *cma_dev,
2695 struct rdma_id_private **to_destroy)
2696 {
2697 struct rdma_id_private *dev_id_priv;
2698 struct net *net = id_priv->id.route.addr.dev_addr.net;
2699 int ret;
2700
2701 lockdep_assert_held(&lock);
2702
2703 *to_destroy = NULL;
2704 if (cma_family(id_priv) == AF_IB && !rdma_cap_ib_cm(cma_dev->device, 1))
2705 return 0;
2706
2707 dev_id_priv =
2708 __rdma_create_id(net, cma_listen_handler, id_priv,
2709 id_priv->id.ps, id_priv->id.qp_type, id_priv);
2710 if (IS_ERR(dev_id_priv))
2711 return PTR_ERR(dev_id_priv);
2712
2713 dev_id_priv->state = RDMA_CM_ADDR_BOUND;
2714 memcpy(cma_src_addr(dev_id_priv), cma_src_addr(id_priv),
2715 rdma_addr_size(cma_src_addr(id_priv)));
2716
2717 _cma_attach_to_dev(dev_id_priv, cma_dev);
2718 rdma_restrack_add(&dev_id_priv->res);
2719 cma_id_get(id_priv);
2720 dev_id_priv->internal_id = 1;
2721 dev_id_priv->afonly = id_priv->afonly;
2722 mutex_lock(&id_priv->qp_mutex);
2723 dev_id_priv->tos_set = id_priv->tos_set;
2724 dev_id_priv->tos = id_priv->tos;
2725 mutex_unlock(&id_priv->qp_mutex);
2726
2727 ret = rdma_listen(&dev_id_priv->id, id_priv->backlog);
2728 if (ret)
2729 goto err_listen;
2730 list_add_tail(&dev_id_priv->listen_item, &id_priv->listen_list);
2731 return 0;
2732 err_listen:
2733 /* Caller must destroy this after releasing lock */
2734 *to_destroy = dev_id_priv;
2735 dev_warn(&cma_dev->device->dev, "RDMA CMA: %s, error %d\n", __func__, ret);
2736 return ret;
2737 }
2738
2739 static int cma_listen_on_all(struct rdma_id_private *id_priv)
2740 {
2741 struct rdma_id_private *to_destroy;
2742 struct cma_device *cma_dev;
2743 int ret;
2744
2745 mutex_lock(&lock);
2746 list_add_tail(&id_priv->listen_any_item, &listen_any_list);
2747 list_for_each_entry(cma_dev, &dev_list, list) {
2748 ret = cma_listen_on_dev(id_priv, cma_dev, &to_destroy);
2749 if (ret) {
2750 /* Prevent racing with cma_process_remove() */
2751 if (to_destroy)
2752 list_del_init(&to_destroy->device_item);
2753 goto err_listen;
2754 }
2755 }
2756 mutex_unlock(&lock);
2757 return 0;
2758
2759 err_listen:
2760 _cma_cancel_listens(id_priv);
2761 mutex_unlock(&lock);
2762 if (to_destroy)
2763 rdma_destroy_id(&to_destroy->id);
2764 return ret;
2765 }
2766
2767 void rdma_set_service_type(struct rdma_cm_id *id, int tos)
2768 {
2769 struct rdma_id_private *id_priv;
2770
2771 id_priv = container_of(id, struct rdma_id_private, id);
2772 mutex_lock(&id_priv->qp_mutex);
2773 id_priv->tos = (u8) tos;
2774 id_priv->tos_set = true;
2775 mutex_unlock(&id_priv->qp_mutex);
2776 }
2777 EXPORT_SYMBOL(rdma_set_service_type);
2778
2779 /**
2780 * rdma_set_ack_timeout() - Set the ack timeout of QP associated
2781 * with a connection identifier.
2782 * @id: Communication identifier to associated with service type.
2783 * @timeout: Ack timeout to set a QP, expressed as 4.096 * 2^(timeout) usec.
2784 *
2785 * This function should be called before rdma_connect() on active side,
2786 * and on passive side before rdma_accept(). It is applicable to primary
2787 * path only. The timeout will affect the local side of the QP, it is not
2788 * negotiated with remote side and zero disables the timer. In case it is
2789 * set before rdma_resolve_route, the value will also be used to determine
2790 * PacketLifeTime for RoCE.
2791 *
2792 * Return: 0 for success
2793 */
2794 int rdma_set_ack_timeout(struct rdma_cm_id *id, u8 timeout)
2795 {
2796 struct rdma_id_private *id_priv;
2797
2798 if (id->qp_type != IB_QPT_RC && id->qp_type != IB_QPT_XRC_INI)
2799 return -EINVAL;
2800
2801 id_priv = container_of(id, struct rdma_id_private, id);
2802 mutex_lock(&id_priv->qp_mutex);
2803 id_priv->timeout = timeout;
2804 id_priv->timeout_set = true;
2805 mutex_unlock(&id_priv->qp_mutex);
2806
2807 return 0;
2808 }
2809 EXPORT_SYMBOL(rdma_set_ack_timeout);
2810
2811 /**
2812 * rdma_set_min_rnr_timer() - Set the minimum RNR Retry timer of the
2813 * QP associated with a connection identifier.
2814 * @id: Communication identifier to associated with service type.
2815 * @min_rnr_timer: 5-bit value encoded as Table 45: "Encoding for RNR NAK
2816 * Timer Field" in the IBTA specification.
2817 *
2818 * This function should be called before rdma_connect() on active
2819 * side, and on passive side before rdma_accept(). The timer value
2820 * will be associated with the local QP. When it receives a send it is
2821 * not read to handle, typically if the receive queue is empty, an RNR
2822 * Retry NAK is returned to the requester with the min_rnr_timer
2823 * encoded. The requester will then wait at least the time specified
2824 * in the NAK before retrying. The default is zero, which translates
2825 * to a minimum RNR Timer value of 655 ms.
2826 *
2827 * Return: 0 for success
2828 */
2829 int rdma_set_min_rnr_timer(struct rdma_cm_id *id, u8 min_rnr_timer)
2830 {
2831 struct rdma_id_private *id_priv;
2832
2833 /* It is a five-bit value */
2834 if (min_rnr_timer & 0xe0)
2835 return -EINVAL;
2836
2837 if (WARN_ON(id->qp_type != IB_QPT_RC && id->qp_type != IB_QPT_XRC_TGT))
2838 return -EINVAL;
2839
2840 id_priv = container_of(id, struct rdma_id_private, id);
2841 mutex_lock(&id_priv->qp_mutex);
2842 id_priv->min_rnr_timer = min_rnr_timer;
2843 id_priv->min_rnr_timer_set = true;
2844 mutex_unlock(&id_priv->qp_mutex);
2845
2846 return 0;
2847 }
2848 EXPORT_SYMBOL(rdma_set_min_rnr_timer);
2849
2850 static int route_set_path_rec_inbound(struct cma_work *work,
2851 struct sa_path_rec *path_rec)
2852 {
2853 struct rdma_route *route = &work->id->id.route;
2854
2855 if (!route->path_rec_inbound) {
2856 route->path_rec_inbound =
2857 kzalloc(sizeof(*route->path_rec_inbound), GFP_KERNEL);
2858 if (!route->path_rec_inbound)
2859 return -ENOMEM;
2860 }
2861
2862 *route->path_rec_inbound = *path_rec;
2863 return 0;
2864 }
2865
2866 static int route_set_path_rec_outbound(struct cma_work *work,
2867 struct sa_path_rec *path_rec)
2868 {
2869 struct rdma_route *route = &work->id->id.route;
2870
2871 if (!route->path_rec_outbound) {
2872 route->path_rec_outbound =
2873 kzalloc(sizeof(*route->path_rec_outbound), GFP_KERNEL);
2874 if (!route->path_rec_outbound)
2875 return -ENOMEM;
2876 }
2877
2878 *route->path_rec_outbound = *path_rec;
2879 return 0;
2880 }
2881
2882 static void cma_query_handler(int status, struct sa_path_rec *path_rec,
2883 unsigned int num_prs, void *context)
2884 {
2885 struct cma_work *work = context;
2886 struct rdma_route *route;
2887 int i;
2888
2889 route = &work->id->id.route;
2890
2891 if (status)
2892 goto fail;
2893
2894 for (i = 0; i < num_prs; i++) {
2895 if (!path_rec[i].flags || (path_rec[i].flags & IB_PATH_GMP))
2896 *route->path_rec = path_rec[i];
2897 else if (path_rec[i].flags & IB_PATH_INBOUND)
2898 status = route_set_path_rec_inbound(work, &path_rec[i]);
2899 else if (path_rec[i].flags & IB_PATH_OUTBOUND)
2900 status = route_set_path_rec_outbound(work,
2901 &path_rec[i]);
2902 else
2903 status = -EINVAL;
2904
2905 if (status)
2906 goto fail;
2907 }
2908
2909 route->num_pri_alt_paths = 1;
2910 queue_work(cma_wq, &work->work);
2911 return;
2912
2913 fail:
2914 work->old_state = RDMA_CM_ROUTE_QUERY;
2915 work->new_state = RDMA_CM_ADDR_RESOLVED;
2916 work->event.event = RDMA_CM_EVENT_ROUTE_ERROR;
2917 work->event.status = status;
2918 pr_debug_ratelimited("RDMA CM: ROUTE_ERROR: failed to query path. status %d\n",
2919 status);
2920 queue_work(cma_wq, &work->work);
2921 }
2922
2923 static int cma_query_ib_route(struct rdma_id_private *id_priv,
2924 unsigned long timeout_ms, struct cma_work *work)
2925 {
2926 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
2927 struct sa_path_rec path_rec;
2928 ib_sa_comp_mask comp_mask;
2929 struct sockaddr_in6 *sin6;
2930 struct sockaddr_ib *sib;
2931
2932 memset(&path_rec, 0, sizeof path_rec);
2933
2934 if (rdma_cap_opa_ah(id_priv->id.device, id_priv->id.port_num))
2935 path_rec.rec_type = SA_PATH_REC_TYPE_OPA;
2936 else
2937 path_rec.rec_type = SA_PATH_REC_TYPE_IB;
2938 rdma_addr_get_sgid(dev_addr, &path_rec.sgid);
2939 rdma_addr_get_dgid(dev_addr, &path_rec.dgid);
2940 path_rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
2941 path_rec.numb_path = 1;
2942 path_rec.reversible = 1;
2943 path_rec.service_id = rdma_get_service_id(&id_priv->id,
2944 cma_dst_addr(id_priv));
2945
2946 comp_mask = IB_SA_PATH_REC_DGID | IB_SA_PATH_REC_SGID |
2947 IB_SA_PATH_REC_PKEY | IB_SA_PATH_REC_NUMB_PATH |
2948 IB_SA_PATH_REC_REVERSIBLE | IB_SA_PATH_REC_SERVICE_ID;
2949
2950 switch (cma_family(id_priv)) {
2951 case AF_INET:
2952 path_rec.qos_class = cpu_to_be16((u16) id_priv->tos);
2953 comp_mask |= IB_SA_PATH_REC_QOS_CLASS;
2954 break;
2955 case AF_INET6:
2956 sin6 = (struct sockaddr_in6 *) cma_src_addr(id_priv);
2957 path_rec.traffic_class = (u8) (be32_to_cpu(sin6->sin6_flowinfo) >> 20);
2958 comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
2959 break;
2960 case AF_IB:
2961 sib = (struct sockaddr_ib *) cma_src_addr(id_priv);
2962 path_rec.traffic_class = (u8) (be32_to_cpu(sib->sib_flowinfo) >> 20);
2963 comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
2964 break;
2965 }
2966
2967 id_priv->query_id = ib_sa_path_rec_get(&sa_client, id_priv->id.device,
2968 id_priv->id.port_num, &path_rec,
2969 comp_mask, timeout_ms,
2970 GFP_KERNEL, cma_query_handler,
2971 work, &id_priv->query);
2972
2973 return (id_priv->query_id < 0) ? id_priv->query_id : 0;
2974 }
2975
2976 static void cma_iboe_join_work_handler(struct work_struct *work)
2977 {
2978 struct cma_multicast *mc =
2979 container_of(work, struct cma_multicast, iboe_join.work);
2980 struct rdma_cm_event *event = &mc->iboe_join.event;
2981 struct rdma_id_private *id_priv = mc->id_priv;
2982 int ret;
2983
2984 mutex_lock(&id_priv->handler_mutex);
2985 if (READ_ONCE(id_priv->state) == RDMA_CM_DESTROYING ||
2986 READ_ONCE(id_priv->state) == RDMA_CM_DEVICE_REMOVAL)
2987 goto out_unlock;
2988
2989 ret = cma_cm_event_handler(id_priv, event);
2990 WARN_ON(ret);
2991
2992 out_unlock:
2993 mutex_unlock(&id_priv->handler_mutex);
2994 if (event->event == RDMA_CM_EVENT_MULTICAST_JOIN)
2995 rdma_destroy_ah_attr(&event->param.ud.ah_attr);
2996 }
2997
2998 static void cma_work_handler(struct work_struct *_work)
2999 {
3000 struct cma_work *work = container_of(_work, struct cma_work, work);
3001 struct rdma_id_private *id_priv = work->id;
3002
3003 mutex_lock(&id_priv->handler_mutex);
3004 if (READ_ONCE(id_priv->state) == RDMA_CM_DESTROYING ||
3005 READ_ONCE(id_priv->state) == RDMA_CM_DEVICE_REMOVAL)
3006 goto out_unlock;
3007 if (work->old_state != 0 || work->new_state != 0) {
3008 if (!cma_comp_exch(id_priv, work->old_state, work->new_state))
3009 goto out_unlock;
3010 }
3011
3012 if (cma_cm_event_handler(id_priv, &work->event)) {
3013 cma_id_put(id_priv);
3014 destroy_id_handler_unlock(id_priv);
3015 goto out_free;
3016 }
3017
3018 out_unlock:
3019 mutex_unlock(&id_priv->handler_mutex);
3020 cma_id_put(id_priv);
3021 out_free:
3022 if (work->event.event == RDMA_CM_EVENT_MULTICAST_JOIN)
3023 rdma_destroy_ah_attr(&work->event.param.ud.ah_attr);
3024 kfree(work);
3025 }
3026
3027 static void cma_init_resolve_route_work(struct cma_work *work,
3028 struct rdma_id_private *id_priv)
3029 {
3030 work->id = id_priv;
3031 INIT_WORK(&work->work, cma_work_handler);
3032 work->old_state = RDMA_CM_ROUTE_QUERY;
3033 work->new_state = RDMA_CM_ROUTE_RESOLVED;
3034 work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
3035 }
3036
3037 static void enqueue_resolve_addr_work(struct cma_work *work,
3038 struct rdma_id_private *id_priv)
3039 {
3040 /* Balances with cma_id_put() in cma_work_handler */
3041 cma_id_get(id_priv);
3042
3043 work->id = id_priv;
3044 INIT_WORK(&work->work, cma_work_handler);
3045 work->old_state = RDMA_CM_ADDR_QUERY;
3046 work->new_state = RDMA_CM_ADDR_RESOLVED;
3047 work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
3048
3049 queue_work(cma_wq, &work->work);
3050 }
3051
3052 static int cma_resolve_ib_route(struct rdma_id_private *id_priv,
3053 unsigned long timeout_ms)
3054 {
3055 struct rdma_route *route = &id_priv->id.route;
3056 struct cma_work *work;
3057 int ret;
3058
3059 work = kzalloc(sizeof *work, GFP_KERNEL);
3060 if (!work)
3061 return -ENOMEM;
3062
3063 cma_init_resolve_route_work(work, id_priv);
3064
3065 if (!route->path_rec)
3066 route->path_rec = kmalloc(sizeof *route->path_rec, GFP_KERNEL);
3067 if (!route->path_rec) {
3068 ret = -ENOMEM;
3069 goto err1;
3070 }
3071
3072 ret = cma_query_ib_route(id_priv, timeout_ms, work);
3073 if (ret)
3074 goto err2;
3075
3076 return 0;
3077 err2:
3078 kfree(route->path_rec);
3079 route->path_rec = NULL;
3080 err1:
3081 kfree(work);
3082 return ret;
3083 }
3084
3085 static enum ib_gid_type cma_route_gid_type(enum rdma_network_type network_type,
3086 unsigned long supported_gids,
3087 enum ib_gid_type default_gid)
3088 {
3089 if ((network_type == RDMA_NETWORK_IPV4 ||
3090 network_type == RDMA_NETWORK_IPV6) &&
3091 test_bit(IB_GID_TYPE_ROCE_UDP_ENCAP, &supported_gids))
3092 return IB_GID_TYPE_ROCE_UDP_ENCAP;
3093
3094 return default_gid;
3095 }
3096
3097 /*
3098 * cma_iboe_set_path_rec_l2_fields() is helper function which sets
3099 * path record type based on GID type.
3100 * It also sets up other L2 fields which includes destination mac address
3101 * netdev ifindex, of the path record.
3102 * It returns the netdev of the bound interface for this path record entry.
3103 */
3104 static struct net_device *
3105 cma_iboe_set_path_rec_l2_fields(struct rdma_id_private *id_priv)
3106 {
3107 struct rdma_route *route = &id_priv->id.route;
3108 enum ib_gid_type gid_type = IB_GID_TYPE_ROCE;
3109 struct rdma_addr *addr = &route->addr;
3110 unsigned long supported_gids;
3111 struct net_device *ndev;
3112
3113 if (!addr->dev_addr.bound_dev_if)
3114 return NULL;
3115
3116 ndev = dev_get_by_index(addr->dev_addr.net,
3117 addr->dev_addr.bound_dev_if);
3118 if (!ndev)
3119 return NULL;
3120
3121 supported_gids = roce_gid_type_mask_support(id_priv->id.device,
3122 id_priv->id.port_num);
3123 gid_type = cma_route_gid_type(addr->dev_addr.network,
3124 supported_gids,
3125 id_priv->gid_type);
3126 /* Use the hint from IP Stack to select GID Type */
3127 if (gid_type < ib_network_to_gid_type(addr->dev_addr.network))
3128 gid_type = ib_network_to_gid_type(addr->dev_addr.network);
3129 route->path_rec->rec_type = sa_conv_gid_to_pathrec_type(gid_type);
3130
3131 route->path_rec->roce.route_resolved = true;
3132 sa_path_set_dmac(route->path_rec, addr->dev_addr.dst_dev_addr);
3133 return ndev;
3134 }
3135
3136 int rdma_set_ib_path(struct rdma_cm_id *id,
3137 struct sa_path_rec *path_rec)
3138 {
3139 struct rdma_id_private *id_priv;
3140 struct net_device *ndev;
3141 int ret;
3142
3143 id_priv = container_of(id, struct rdma_id_private, id);
3144 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED,
3145 RDMA_CM_ROUTE_RESOLVED))
3146 return -EINVAL;
3147
3148 id->route.path_rec = kmemdup(path_rec, sizeof(*path_rec),
3149 GFP_KERNEL);
3150 if (!id->route.path_rec) {
3151 ret = -ENOMEM;
3152 goto err;
3153 }
3154
3155 if (rdma_protocol_roce(id->device, id->port_num)) {
3156 ndev = cma_iboe_set_path_rec_l2_fields(id_priv);
3157 if (!ndev) {
3158 ret = -ENODEV;
3159 goto err_free;
3160 }
3161 dev_put(ndev);
3162 }
3163
3164 id->route.num_pri_alt_paths = 1;
3165 return 0;
3166
3167 err_free:
3168 kfree(id->route.path_rec);
3169 id->route.path_rec = NULL;
3170 err:
3171 cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_ADDR_RESOLVED);
3172 return ret;
3173 }
3174 EXPORT_SYMBOL(rdma_set_ib_path);
3175
3176 static int cma_resolve_iw_route(struct rdma_id_private *id_priv)
3177 {
3178 struct cma_work *work;
3179
3180 work = kzalloc(sizeof *work, GFP_KERNEL);
3181 if (!work)
3182 return -ENOMEM;
3183
3184 cma_init_resolve_route_work(work, id_priv);
3185 queue_work(cma_wq, &work->work);
3186 return 0;
3187 }
3188
3189 static int get_vlan_ndev_tc(struct net_device *vlan_ndev, int prio)
3190 {
3191 struct net_device *dev;
3192
3193 dev = vlan_dev_real_dev(vlan_ndev);
3194 if (dev->num_tc)
3195 return netdev_get_prio_tc_map(dev, prio);
3196
3197 return (vlan_dev_get_egress_qos_mask(vlan_ndev, prio) &
3198 VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
3199 }
3200
3201 struct iboe_prio_tc_map {
3202 int input_prio;
3203 int output_tc;
3204 bool found;
3205 };
3206
3207 static int get_lower_vlan_dev_tc(struct net_device *dev,
3208 struct netdev_nested_priv *priv)
3209 {
3210 struct iboe_prio_tc_map *map = (struct iboe_prio_tc_map *)priv->data;
3211
3212 if (is_vlan_dev(dev))
3213 map->output_tc = get_vlan_ndev_tc(dev, map->input_prio);
3214 else if (dev->num_tc)
3215 map->output_tc = netdev_get_prio_tc_map(dev, map->input_prio);
3216 else
3217 map->output_tc = 0;
3218 /* We are interested only in first level VLAN device, so always
3219 * return 1 to stop iterating over next level devices.
3220 */
3221 map->found = true;
3222 return 1;
3223 }
3224
3225 static int iboe_tos_to_sl(struct net_device *ndev, int tos)
3226 {
3227 struct iboe_prio_tc_map prio_tc_map = {};
3228 int prio = rt_tos2priority(tos);
3229 struct netdev_nested_priv priv;
3230
3231 /* If VLAN device, get it directly from the VLAN netdev */
3232 if (is_vlan_dev(ndev))
3233 return get_vlan_ndev_tc(ndev, prio);
3234
3235 prio_tc_map.input_prio = prio;
3236 priv.data = (void *)&prio_tc_map;
3237 rcu_read_lock();
3238 netdev_walk_all_lower_dev_rcu(ndev,
3239 get_lower_vlan_dev_tc,
3240 &priv);
3241 rcu_read_unlock();
3242 /* If map is found from lower device, use it; Otherwise
3243 * continue with the current netdevice to get priority to tc map.
3244 */
3245 if (prio_tc_map.found)
3246 return prio_tc_map.output_tc;
3247 else if (ndev->num_tc)
3248 return netdev_get_prio_tc_map(ndev, prio);
3249 else
3250 return 0;
3251 }
3252
3253 static __be32 cma_get_roce_udp_flow_label(struct rdma_id_private *id_priv)
3254 {
3255 struct sockaddr_in6 *addr6;
3256 u16 dport, sport;
3257 u32 hash, fl;
3258
3259 addr6 = (struct sockaddr_in6 *)cma_src_addr(id_priv);
3260 fl = be32_to_cpu(addr6->sin6_flowinfo) & IB_GRH_FLOWLABEL_MASK;
3261 if ((cma_family(id_priv) != AF_INET6) || !fl) {
3262 dport = be16_to_cpu(cma_port(cma_dst_addr(id_priv)));
3263 sport = be16_to_cpu(cma_port(cma_src_addr(id_priv)));
3264 hash = (u32)sport * 31 + dport;
3265 fl = hash & IB_GRH_FLOWLABEL_MASK;
3266 }
3267
3268 return cpu_to_be32(fl);
3269 }
3270
3271 static int cma_resolve_iboe_route(struct rdma_id_private *id_priv)
3272 {
3273 struct rdma_route *route = &id_priv->id.route;
3274 struct rdma_addr *addr = &route->addr;
3275 struct cma_work *work;
3276 int ret;
3277 struct net_device *ndev;
3278
3279 u8 default_roce_tos = id_priv->cma_dev->default_roce_tos[id_priv->id.port_num -
3280 rdma_start_port(id_priv->cma_dev->device)];
3281 u8 tos;
3282
3283 mutex_lock(&id_priv->qp_mutex);
3284 tos = id_priv->tos_set ? id_priv->tos : default_roce_tos;
3285 mutex_unlock(&id_priv->qp_mutex);
3286
3287 work = kzalloc(sizeof *work, GFP_KERNEL);
3288 if (!work)
3289 return -ENOMEM;
3290
3291 route->path_rec = kzalloc(sizeof *route->path_rec, GFP_KERNEL);
3292 if (!route->path_rec) {
3293 ret = -ENOMEM;
3294 goto err1;
3295 }
3296
3297 route->num_pri_alt_paths = 1;
3298
3299 ndev = cma_iboe_set_path_rec_l2_fields(id_priv);
3300 if (!ndev) {
3301 ret = -ENODEV;
3302 goto err2;
3303 }
3304
3305 rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
3306 &route->path_rec->sgid);
3307 rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.dst_addr,
3308 &route->path_rec->dgid);
3309
3310 if (((struct sockaddr *)&id_priv->id.route.addr.dst_addr)->sa_family != AF_IB)
3311 /* TODO: get the hoplimit from the inet/inet6 device */
3312 route->path_rec->hop_limit = addr->dev_addr.hoplimit;
3313 else
3314 route->path_rec->hop_limit = 1;
3315 route->path_rec->reversible = 1;
3316 route->path_rec->pkey = cpu_to_be16(0xffff);
3317 route->path_rec->mtu_selector = IB_SA_EQ;
3318 route->path_rec->sl = iboe_tos_to_sl(ndev, tos);
3319 route->path_rec->traffic_class = tos;
3320 route->path_rec->mtu = iboe_get_mtu(ndev->mtu);
3321 route->path_rec->rate_selector = IB_SA_EQ;
3322 route->path_rec->rate = IB_RATE_PORT_CURRENT;
3323 dev_put(ndev);
3324 route->path_rec->packet_life_time_selector = IB_SA_EQ;
3325 /* In case ACK timeout is set, use this value to calculate
3326 * PacketLifeTime. As per IBTA 12.7.34,
3327 * local ACK timeout = (2 * PacketLifeTime + Local CA’s ACK delay).
3328 * Assuming a negligible local ACK delay, we can use
3329 * PacketLifeTime = local ACK timeout/2
3330 * as a reasonable approximation for RoCE networks.
3331 */
3332 mutex_lock(&id_priv->qp_mutex);
3333 if (id_priv->timeout_set && id_priv->timeout)
3334 route->path_rec->packet_life_time = id_priv->timeout - 1;
3335 else
3336 route->path_rec->packet_life_time = CMA_IBOE_PACKET_LIFETIME;
3337 mutex_unlock(&id_priv->qp_mutex);
3338
3339 if (!route->path_rec->mtu) {
3340 ret = -EINVAL;
3341 goto err2;
3342 }
3343
3344 if (rdma_protocol_roce_udp_encap(id_priv->id.device,
3345 id_priv->id.port_num))
3346 route->path_rec->flow_label =
3347 cma_get_roce_udp_flow_label(id_priv);
3348
3349 cma_init_resolve_route_work(work, id_priv);
3350 queue_work(cma_wq, &work->work);
3351
3352 return 0;
3353
3354 err2:
3355 kfree(route->path_rec);
3356 route->path_rec = NULL;
3357 route->num_pri_alt_paths = 0;
3358 err1:
3359 kfree(work);
3360 return ret;
3361 }
3362
3363 int rdma_resolve_route(struct rdma_cm_id *id, unsigned long timeout_ms)
3364 {
3365 struct rdma_id_private *id_priv;
3366 int ret;
3367
3368 if (!timeout_ms)
3369 return -EINVAL;
3370
3371 id_priv = container_of(id, struct rdma_id_private, id);
3372 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED, RDMA_CM_ROUTE_QUERY))
3373 return -EINVAL;
3374
3375 cma_id_get(id_priv);
3376 if (rdma_cap_ib_sa(id->device, id->port_num))
3377 ret = cma_resolve_ib_route(id_priv, timeout_ms);
3378 else if (rdma_protocol_roce(id->device, id->port_num)) {
3379 ret = cma_resolve_iboe_route(id_priv);
3380 if (!ret)
3381 cma_add_id_to_tree(id_priv);
3382 }
3383 else if (rdma_protocol_iwarp(id->device, id->port_num))
3384 ret = cma_resolve_iw_route(id_priv);
3385 else
3386 ret = -ENOSYS;
3387
3388 if (ret)
3389 goto err;
3390
3391 return 0;
3392 err:
3393 cma_comp_exch(id_priv, RDMA_CM_ROUTE_QUERY, RDMA_CM_ADDR_RESOLVED);
3394 cma_id_put(id_priv);
3395 return ret;
3396 }
3397 EXPORT_SYMBOL(rdma_resolve_route);
3398
3399 static void cma_set_loopback(struct sockaddr *addr)
3400 {
3401 switch (addr->sa_family) {
3402 case AF_INET:
3403 ((struct sockaddr_in *) addr)->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
3404 break;
3405 case AF_INET6:
3406 ipv6_addr_set(&((struct sockaddr_in6 *) addr)->sin6_addr,
3407 0, 0, 0, htonl(1));
3408 break;
3409 default:
3410 ib_addr_set(&((struct sockaddr_ib *) addr)->sib_addr,
3411 0, 0, 0, htonl(1));
3412 break;
3413 }
3414 }
3415
3416 static int cma_bind_loopback(struct rdma_id_private *id_priv)
3417 {
3418 struct cma_device *cma_dev, *cur_dev;
3419 union ib_gid gid;
3420 enum ib_port_state port_state;
3421 unsigned int p;
3422 u16 pkey;
3423 int ret;
3424
3425 cma_dev = NULL;
3426 mutex_lock(&lock);
3427 list_for_each_entry(cur_dev, &dev_list, list) {
3428 if (cma_family(id_priv) == AF_IB &&
3429 !rdma_cap_ib_cm(cur_dev->device, 1))
3430 continue;
3431
3432 if (!cma_dev)
3433 cma_dev = cur_dev;
3434
3435 rdma_for_each_port (cur_dev->device, p) {
3436 if (!ib_get_cached_port_state(cur_dev->device, p, &port_state) &&
3437 port_state == IB_PORT_ACTIVE) {
3438 cma_dev = cur_dev;
3439 goto port_found;
3440 }
3441 }
3442 }
3443
3444 if (!cma_dev) {
3445 ret = -ENODEV;
3446 goto out;
3447 }
3448
3449 p = 1;
3450
3451 port_found:
3452 ret = rdma_query_gid(cma_dev->device, p, 0, &gid);
3453 if (ret)
3454 goto out;
3455
3456 ret = ib_get_cached_pkey(cma_dev->device, p, 0, &pkey);
3457 if (ret)
3458 goto out;
3459
3460 id_priv->id.route.addr.dev_addr.dev_type =
3461 (rdma_protocol_ib(cma_dev->device, p)) ?
3462 ARPHRD_INFINIBAND : ARPHRD_ETHER;
3463
3464 rdma_addr_set_sgid(&id_priv->id.route.addr.dev_addr, &gid);
3465 ib_addr_set_pkey(&id_priv->id.route.addr.dev_addr, pkey);
3466 id_priv->id.port_num = p;
3467 cma_attach_to_dev(id_priv, cma_dev);
3468 rdma_restrack_add(&id_priv->res);
3469 cma_set_loopback(cma_src_addr(id_priv));
3470 out:
3471 mutex_unlock(&lock);
3472 return ret;
3473 }
3474
3475 static void addr_handler(int status, struct sockaddr *src_addr,
3476 struct rdma_dev_addr *dev_addr, void *context)
3477 {
3478 struct rdma_id_private *id_priv = context;
3479 struct rdma_cm_event event = {};
3480 struct sockaddr *addr;
3481 struct sockaddr_storage old_addr;
3482
3483 mutex_lock(&id_priv->handler_mutex);
3484 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY,
3485 RDMA_CM_ADDR_RESOLVED))
3486 goto out;
3487
3488 /*
3489 * Store the previous src address, so that if we fail to acquire
3490 * matching rdma device, old address can be restored back, which helps
3491 * to cancel the cma listen operation correctly.
3492 */
3493 addr = cma_src_addr(id_priv);
3494 memcpy(&old_addr, addr, rdma_addr_size(addr));
3495 memcpy(addr, src_addr, rdma_addr_size(src_addr));
3496 if (!status && !id_priv->cma_dev) {
3497 status = cma_acquire_dev_by_src_ip(id_priv);
3498 if (status)
3499 pr_debug_ratelimited("RDMA CM: ADDR_ERROR: failed to acquire device. status %d\n",
3500 status);
3501 rdma_restrack_add(&id_priv->res);
3502 } else if (status) {
3503 pr_debug_ratelimited("RDMA CM: ADDR_ERROR: failed to resolve IP. status %d\n", status);
3504 }
3505
3506 if (status) {
3507 memcpy(addr, &old_addr,
3508 rdma_addr_size((struct sockaddr *)&old_addr));
3509 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED,
3510 RDMA_CM_ADDR_BOUND))
3511 goto out;
3512 event.event = RDMA_CM_EVENT_ADDR_ERROR;
3513 event.status = status;
3514 } else
3515 event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
3516
3517 if (cma_cm_event_handler(id_priv, &event)) {
3518 destroy_id_handler_unlock(id_priv);
3519 return;
3520 }
3521 out:
3522 mutex_unlock(&id_priv->handler_mutex);
3523 }
3524
3525 static int cma_resolve_loopback(struct rdma_id_private *id_priv)
3526 {
3527 struct cma_work *work;
3528 union ib_gid gid;
3529 int ret;
3530
3531 work = kzalloc(sizeof *work, GFP_KERNEL);
3532 if (!work)
3533 return -ENOMEM;
3534
3535 if (!id_priv->cma_dev) {
3536 ret = cma_bind_loopback(id_priv);
3537 if (ret)
3538 goto err;
3539 }
3540
3541 rdma_addr_get_sgid(&id_priv->id.route.addr.dev_addr, &gid);
3542 rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, &gid);
3543
3544 enqueue_resolve_addr_work(work, id_priv);
3545 return 0;
3546 err:
3547 kfree(work);
3548 return ret;
3549 }
3550
3551 static int cma_resolve_ib_addr(struct rdma_id_private *id_priv)
3552 {
3553 struct cma_work *work;
3554 int ret;
3555
3556 work = kzalloc(sizeof *work, GFP_KERNEL);
3557 if (!work)
3558 return -ENOMEM;
3559
3560 if (!id_priv->cma_dev) {
3561 ret = cma_resolve_ib_dev(id_priv);
3562 if (ret)
3563 goto err;
3564 }
3565
3566 rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, (union ib_gid *)
3567 &(((struct sockaddr_ib *) &id_priv->id.route.addr.dst_addr)->sib_addr));
3568
3569 enqueue_resolve_addr_work(work, id_priv);
3570 return 0;
3571 err:
3572 kfree(work);
3573 return ret;
3574 }
3575
3576 int rdma_set_reuseaddr(struct rdma_cm_id *id, int reuse)
3577 {
3578 struct rdma_id_private *id_priv;
3579 unsigned long flags;
3580 int ret;
3581
3582 id_priv = container_of(id, struct rdma_id_private, id);
3583 spin_lock_irqsave(&id_priv->lock, flags);
3584 if ((reuse && id_priv->state != RDMA_CM_LISTEN) ||
3585 id_priv->state == RDMA_CM_IDLE) {
3586 id_priv->reuseaddr = reuse;
3587 ret = 0;
3588 } else {
3589 ret = -EINVAL;
3590 }
3591 spin_unlock_irqrestore(&id_priv->lock, flags);
3592 return ret;
3593 }
3594 EXPORT_SYMBOL(rdma_set_reuseaddr);
3595
3596 int rdma_set_afonly(struct rdma_cm_id *id, int afonly)
3597 {
3598 struct rdma_id_private *id_priv;
3599 unsigned long flags;
3600 int ret;
3601
3602 id_priv = container_of(id, struct rdma_id_private, id);
3603 spin_lock_irqsave(&id_priv->lock, flags);
3604 if (id_priv->state == RDMA_CM_IDLE || id_priv->state == RDMA_CM_ADDR_BOUND) {
3605 id_priv->options |= (1 << CMA_OPTION_AFONLY);
3606 id_priv->afonly = afonly;
3607 ret = 0;
3608 } else {
3609 ret = -EINVAL;
3610 }
3611 spin_unlock_irqrestore(&id_priv->lock, flags);
3612 return ret;
3613 }
3614 EXPORT_SYMBOL(rdma_set_afonly);
3615
3616 static void cma_bind_port(struct rdma_bind_list *bind_list,
3617 struct rdma_id_private *id_priv)
3618 {
3619 struct sockaddr *addr;
3620 struct sockaddr_ib *sib;
3621 u64 sid, mask;
3622 __be16 port;
3623
3624 lockdep_assert_held(&lock);
3625
3626 addr = cma_src_addr(id_priv);
3627 port = htons(bind_list->port);
3628
3629 switch (addr->sa_family) {
3630 case AF_INET:
3631 ((struct sockaddr_in *) addr)->sin_port = port;
3632 break;
3633 case AF_INET6:
3634 ((struct sockaddr_in6 *) addr)->sin6_port = port;
3635 break;
3636 case AF_IB:
3637 sib = (struct sockaddr_ib *) addr;
3638 sid = be64_to_cpu(sib->sib_sid);
3639 mask = be64_to_cpu(sib->sib_sid_mask);
3640 sib->sib_sid = cpu_to_be64((sid & mask) | (u64) ntohs(port));
3641 sib->sib_sid_mask = cpu_to_be64(~0ULL);
3642 break;
3643 }
3644 id_priv->bind_list = bind_list;
3645 hlist_add_head(&id_priv->node, &bind_list->owners);
3646 }
3647
3648 static int cma_alloc_port(enum rdma_ucm_port_space ps,
3649 struct rdma_id_private *id_priv, unsigned short snum)
3650 {
3651 struct rdma_bind_list *bind_list;
3652 int ret;
3653
3654 lockdep_assert_held(&lock);
3655
3656 bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL);
3657 if (!bind_list)
3658 return -ENOMEM;
3659
3660 ret = cma_ps_alloc(id_priv->id.route.addr.dev_addr.net, ps, bind_list,
3661 snum);
3662 if (ret < 0)
3663 goto err;
3664
3665 bind_list->ps = ps;
3666 bind_list->port = snum;
3667 cma_bind_port(bind_list, id_priv);
3668 return 0;
3669 err:
3670 kfree(bind_list);
3671 return ret == -ENOSPC ? -EADDRNOTAVAIL : ret;
3672 }
3673
3674 static int cma_port_is_unique(struct rdma_bind_list *bind_list,
3675 struct rdma_id_private *id_priv)
3676 {
3677 struct rdma_id_private *cur_id;
3678 struct sockaddr *daddr = cma_dst_addr(id_priv);
3679 struct sockaddr *saddr = cma_src_addr(id_priv);
3680 __be16 dport = cma_port(daddr);
3681
3682 lockdep_assert_held(&lock);
3683
3684 hlist_for_each_entry(cur_id, &bind_list->owners, node) {
3685 struct sockaddr *cur_daddr = cma_dst_addr(cur_id);
3686 struct sockaddr *cur_saddr = cma_src_addr(cur_id);
3687 __be16 cur_dport = cma_port(cur_daddr);
3688
3689 if (id_priv == cur_id)
3690 continue;
3691
3692 /* different dest port -> unique */
3693 if (!cma_any_port(daddr) &&
3694 !cma_any_port(cur_daddr) &&
3695 (dport != cur_dport))
3696 continue;
3697
3698 /* different src address -> unique */
3699 if (!cma_any_addr(saddr) &&
3700 !cma_any_addr(cur_saddr) &&
3701 cma_addr_cmp(saddr, cur_saddr))
3702 continue;
3703
3704 /* different dst address -> unique */
3705 if (!cma_any_addr(daddr) &&
3706 !cma_any_addr(cur_daddr) &&
3707 cma_addr_cmp(daddr, cur_daddr))
3708 continue;
3709
3710 return -EADDRNOTAVAIL;
3711 }
3712 return 0;
3713 }
3714
3715 static int cma_alloc_any_port(enum rdma_ucm_port_space ps,
3716 struct rdma_id_private *id_priv)
3717 {
3718 static unsigned int last_used_port;
3719 int low, high, remaining;
3720 unsigned int rover;
3721 struct net *net = id_priv->id.route.addr.dev_addr.net;
3722
3723 lockdep_assert_held(&lock);
3724
3725 inet_get_local_port_range(net, &low, &high);
3726 remaining = (high - low) + 1;
3727 rover = get_random_u32_inclusive(low, remaining + low - 1);
3728 retry:
3729 if (last_used_port != rover) {
3730 struct rdma_bind_list *bind_list;
3731 int ret;
3732
3733 bind_list = cma_ps_find(net, ps, (unsigned short)rover);
3734
3735 if (!bind_list) {
3736 ret = cma_alloc_port(ps, id_priv, rover);
3737 } else {
3738 ret = cma_port_is_unique(bind_list, id_priv);
3739 if (!ret)
3740 cma_bind_port(bind_list, id_priv);
3741 }
3742 /*
3743 * Remember previously used port number in order to avoid
3744 * re-using same port immediately after it is closed.
3745 */
3746 if (!ret)
3747 last_used_port = rover;
3748 if (ret != -EADDRNOTAVAIL)
3749 return ret;
3750 }
3751 if (--remaining) {
3752 rover++;
3753 if ((rover < low) || (rover > high))
3754 rover = low;
3755 goto retry;
3756 }
3757 return -EADDRNOTAVAIL;
3758 }
3759
3760 /*
3761 * Check that the requested port is available. This is called when trying to
3762 * bind to a specific port, or when trying to listen on a bound port. In
3763 * the latter case, the provided id_priv may already be on the bind_list, but
3764 * we still need to check that it's okay to start listening.
3765 */
3766 static int cma_check_port(struct rdma_bind_list *bind_list,
3767 struct rdma_id_private *id_priv, uint8_t reuseaddr)
3768 {
3769 struct rdma_id_private *cur_id;
3770 struct sockaddr *addr, *cur_addr;
3771
3772 lockdep_assert_held(&lock);
3773
3774 addr = cma_src_addr(id_priv);
3775 hlist_for_each_entry(cur_id, &bind_list->owners, node) {
3776 if (id_priv == cur_id)
3777 continue;
3778
3779 if (reuseaddr && cur_id->reuseaddr)
3780 continue;
3781
3782 cur_addr = cma_src_addr(cur_id);
3783 if (id_priv->afonly && cur_id->afonly &&
3784 (addr->sa_family != cur_addr->sa_family))
3785 continue;
3786
3787 if (cma_any_addr(addr) || cma_any_addr(cur_addr))
3788 return -EADDRNOTAVAIL;
3789
3790 if (!cma_addr_cmp(addr, cur_addr))
3791 return -EADDRINUSE;
3792 }
3793 return 0;
3794 }
3795
3796 static int cma_use_port(enum rdma_ucm_port_space ps,
3797 struct rdma_id_private *id_priv)
3798 {
3799 struct rdma_bind_list *bind_list;
3800 unsigned short snum;
3801 int ret;
3802
3803 lockdep_assert_held(&lock);
3804
3805 snum = ntohs(cma_port(cma_src_addr(id_priv)));
3806 if (snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
3807 return -EACCES;
3808
3809 bind_list = cma_ps_find(id_priv->id.route.addr.dev_addr.net, ps, snum);
3810 if (!bind_list) {
3811 ret = cma_alloc_port(ps, id_priv, snum);
3812 } else {
3813 ret = cma_check_port(bind_list, id_priv, id_priv->reuseaddr);
3814 if (!ret)
3815 cma_bind_port(bind_list, id_priv);
3816 }
3817 return ret;
3818 }
3819
3820 static enum rdma_ucm_port_space
3821 cma_select_inet_ps(struct rdma_id_private *id_priv)
3822 {
3823 switch (id_priv->id.ps) {
3824 case RDMA_PS_TCP:
3825 case RDMA_PS_UDP:
3826 case RDMA_PS_IPOIB:
3827 case RDMA_PS_IB:
3828 return id_priv->id.ps;
3829 default:
3830
3831 return 0;
3832 }
3833 }
3834
3835 static enum rdma_ucm_port_space
3836 cma_select_ib_ps(struct rdma_id_private *id_priv)
3837 {
3838 enum rdma_ucm_port_space ps = 0;
3839 struct sockaddr_ib *sib;
3840 u64 sid_ps, mask, sid;
3841
3842 sib = (struct sockaddr_ib *) cma_src_addr(id_priv);
3843 mask = be64_to_cpu(sib->sib_sid_mask) & RDMA_IB_IP_PS_MASK;
3844 sid = be64_to_cpu(sib->sib_sid) & mask;
3845
3846 if ((id_priv->id.ps == RDMA_PS_IB) && (sid == (RDMA_IB_IP_PS_IB & mask))) {
3847 sid_ps = RDMA_IB_IP_PS_IB;
3848 ps = RDMA_PS_IB;
3849 } else if (((id_priv->id.ps == RDMA_PS_IB) || (id_priv->id.ps == RDMA_PS_TCP)) &&
3850 (sid == (RDMA_IB_IP_PS_TCP & mask))) {
3851 sid_ps = RDMA_IB_IP_PS_TCP;
3852 ps = RDMA_PS_TCP;
3853 } else if (((id_priv->id.ps == RDMA_PS_IB) || (id_priv->id.ps == RDMA_PS_UDP)) &&
3854 (sid == (RDMA_IB_IP_PS_UDP & mask))) {
3855 sid_ps = RDMA_IB_IP_PS_UDP;
3856 ps = RDMA_PS_UDP;
3857 }
3858
3859 if (ps) {
3860 sib->sib_sid = cpu_to_be64(sid_ps | ntohs(cma_port((struct sockaddr *) sib)));
3861 sib->sib_sid_mask = cpu_to_be64(RDMA_IB_IP_PS_MASK |
3862 be64_to_cpu(sib->sib_sid_mask));
3863 }
3864 return ps;
3865 }
3866
3867 static int cma_get_port(struct rdma_id_private *id_priv)
3868 {
3869 enum rdma_ucm_port_space ps;
3870 int ret;
3871
3872 if (cma_family(id_priv) != AF_IB)
3873 ps = cma_select_inet_ps(id_priv);
3874 else
3875 ps = cma_select_ib_ps(id_priv);
3876 if (!ps)
3877 return -EPROTONOSUPPORT;
3878
3879 mutex_lock(&lock);
3880 if (cma_any_port(cma_src_addr(id_priv)))
3881 ret = cma_alloc_any_port(ps, id_priv);
3882 else
3883 ret = cma_use_port(ps, id_priv);
3884 mutex_unlock(&lock);
3885
3886 return ret;
3887 }
3888
3889 static int cma_check_linklocal(struct rdma_dev_addr *dev_addr,
3890 struct sockaddr *addr)
3891 {
3892 #if IS_ENABLED(CONFIG_IPV6)
3893 struct sockaddr_in6 *sin6;
3894
3895 if (addr->sa_family != AF_INET6)
3896 return 0;
3897
3898 sin6 = (struct sockaddr_in6 *) addr;
3899
3900 if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
3901 return 0;
3902
3903 if (!sin6->sin6_scope_id)
3904 return -EINVAL;
3905
3906 dev_addr->bound_dev_if = sin6->sin6_scope_id;
3907 #endif
3908 return 0;
3909 }
3910
3911 int rdma_listen(struct rdma_cm_id *id, int backlog)
3912 {
3913 struct rdma_id_private *id_priv =
3914 container_of(id, struct rdma_id_private, id);
3915 int ret;
3916
3917 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_LISTEN)) {
3918 struct sockaddr_in any_in = {
3919 .sin_family = AF_INET,
3920 .sin_addr.s_addr = htonl(INADDR_ANY),
3921 };
3922
3923 /* For a well behaved ULP state will be RDMA_CM_IDLE */
3924 ret = rdma_bind_addr(id, (struct sockaddr *)&any_in);
3925 if (ret)
3926 return ret;
3927 if (WARN_ON(!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND,
3928 RDMA_CM_LISTEN)))
3929 return -EINVAL;
3930 }
3931
3932 /*
3933 * Once the ID reaches RDMA_CM_LISTEN it is not allowed to be reusable
3934 * any more, and has to be unique in the bind list.
3935 */
3936 if (id_priv->reuseaddr) {
3937 mutex_lock(&lock);
3938 ret = cma_check_port(id_priv->bind_list, id_priv, 0);
3939 if (!ret)
3940 id_priv->reuseaddr = 0;
3941 mutex_unlock(&lock);
3942 if (ret)
3943 goto err;
3944 }
3945
3946 id_priv->backlog = backlog;
3947 if (id_priv->cma_dev) {
3948 if (rdma_cap_ib_cm(id->device, 1)) {
3949 ret = cma_ib_listen(id_priv);
3950 if (ret)
3951 goto err;
3952 } else if (rdma_cap_iw_cm(id->device, 1)) {
3953 ret = cma_iw_listen(id_priv, backlog);
3954 if (ret)
3955 goto err;
3956 } else {
3957 ret = -ENOSYS;
3958 goto err;
3959 }
3960 } else {
3961 ret = cma_listen_on_all(id_priv);
3962 if (ret)
3963 goto err;
3964 }
3965
3966 return 0;
3967 err:
3968 id_priv->backlog = 0;
3969 /*
3970 * All the failure paths that lead here will not allow the req_handler's
3971 * to have run.
3972 */
3973 cma_comp_exch(id_priv, RDMA_CM_LISTEN, RDMA_CM_ADDR_BOUND);
3974 return ret;
3975 }
3976 EXPORT_SYMBOL(rdma_listen);
3977
3978 static int rdma_bind_addr_dst(struct rdma_id_private *id_priv,
3979 struct sockaddr *addr, const struct sockaddr *daddr)
3980 {
3981 struct sockaddr *id_daddr;
3982 int ret;
3983
3984 if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6 &&
3985 addr->sa_family != AF_IB)
3986 return -EAFNOSUPPORT;
3987
3988 if (!cma_comp_exch(id_priv, RDMA_CM_IDLE, RDMA_CM_ADDR_BOUND))
3989 return -EINVAL;
3990
3991 ret = cma_check_linklocal(&id_priv->id.route.addr.dev_addr, addr);
3992 if (ret)
3993 goto err1;
3994
3995 memcpy(cma_src_addr(id_priv), addr, rdma_addr_size(addr));
3996 if (!cma_any_addr(addr)) {
3997 ret = cma_translate_addr(addr, &id_priv->id.route.addr.dev_addr);
3998 if (ret)
3999 goto err1;
4000
4001 ret = cma_acquire_dev_by_src_ip(id_priv);
4002 if (ret)
4003 goto err1;
4004 }
4005
4006 if (!(id_priv->options & (1 << CMA_OPTION_AFONLY))) {
4007 if (addr->sa_family == AF_INET)
4008 id_priv->afonly = 1;
4009 #if IS_ENABLED(CONFIG_IPV6)
4010 else if (addr->sa_family == AF_INET6) {
4011 struct net *net = id_priv->id.route.addr.dev_addr.net;
4012
4013 id_priv->afonly = net->ipv6.sysctl.bindv6only;
4014 }
4015 #endif
4016 }
4017 id_daddr = cma_dst_addr(id_priv);
4018 if (daddr != id_daddr)
4019 memcpy(id_daddr, daddr, rdma_addr_size(addr));
4020 id_daddr->sa_family = addr->sa_family;
4021
4022 ret = cma_get_port(id_priv);
4023 if (ret)
4024 goto err2;
4025
4026 if (!cma_any_addr(addr))
4027 rdma_restrack_add(&id_priv->res);
4028 return 0;
4029 err2:
4030 if (id_priv->cma_dev)
4031 cma_release_dev(id_priv);
4032 err1:
4033 cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_IDLE);
4034 return ret;
4035 }
4036
4037 static int cma_bind_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
4038 const struct sockaddr *dst_addr)
4039 {
4040 struct rdma_id_private *id_priv =
4041 container_of(id, struct rdma_id_private, id);
4042 struct sockaddr_storage zero_sock = {};
4043
4044 if (src_addr && src_addr->sa_family)
4045 return rdma_bind_addr_dst(id_priv, src_addr, dst_addr);
4046
4047 /*
4048 * When the src_addr is not specified, automatically supply an any addr
4049 */
4050 zero_sock.ss_family = dst_addr->sa_family;
4051 if (IS_ENABLED(CONFIG_IPV6) && dst_addr->sa_family == AF_INET6) {
4052 struct sockaddr_in6 *src_addr6 =
4053 (struct sockaddr_in6 *)&zero_sock;
4054 struct sockaddr_in6 *dst_addr6 =
4055 (struct sockaddr_in6 *)dst_addr;
4056
4057 src_addr6->sin6_scope_id = dst_addr6->sin6_scope_id;
4058 if (ipv6_addr_type(&dst_addr6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
4059 id->route.addr.dev_addr.bound_dev_if =
4060 dst_addr6->sin6_scope_id;
4061 } else if (dst_addr->sa_family == AF_IB) {
4062 ((struct sockaddr_ib *)&zero_sock)->sib_pkey =
4063 ((struct sockaddr_ib *)dst_addr)->sib_pkey;
4064 }
4065 return rdma_bind_addr_dst(id_priv, (struct sockaddr *)&zero_sock, dst_addr);
4066 }
4067
4068 /*
4069 * If required, resolve the source address for bind and leave the id_priv in
4070 * state RDMA_CM_ADDR_BOUND. This oddly uses the state to determine the prior
4071 * calls made by ULP, a previously bound ID will not be re-bound and src_addr is
4072 * ignored.
4073 */
4074 static int resolve_prepare_src(struct rdma_id_private *id_priv,
4075 struct sockaddr *src_addr,
4076 const struct sockaddr *dst_addr)
4077 {
4078 int ret;
4079
4080 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_ADDR_QUERY)) {
4081 /* For a well behaved ULP state will be RDMA_CM_IDLE */
4082 ret = cma_bind_addr(&id_priv->id, src_addr, dst_addr);
4083 if (ret)
4084 return ret;
4085 if (WARN_ON(!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND,
4086 RDMA_CM_ADDR_QUERY)))
4087 return -EINVAL;
4088
4089 } else {
4090 memcpy(cma_dst_addr(id_priv), dst_addr, rdma_addr_size(dst_addr));
4091 }
4092
4093 if (cma_family(id_priv) != dst_addr->sa_family) {
4094 ret = -EINVAL;
4095 goto err_state;
4096 }
4097 return 0;
4098
4099 err_state:
4100 cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY, RDMA_CM_ADDR_BOUND);
4101 return ret;
4102 }
4103
4104 int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
4105 const struct sockaddr *dst_addr, unsigned long timeout_ms)
4106 {
4107 struct rdma_id_private *id_priv =
4108 container_of(id, struct rdma_id_private, id);
4109 int ret;
4110
4111 ret = resolve_prepare_src(id_priv, src_addr, dst_addr);
4112 if (ret)
4113 return ret;
4114
4115 if (cma_any_addr(dst_addr)) {
4116 ret = cma_resolve_loopback(id_priv);
4117 } else {
4118 if (dst_addr->sa_family == AF_IB) {
4119 ret = cma_resolve_ib_addr(id_priv);
4120 } else {
4121 /*
4122 * The FSM can return back to RDMA_CM_ADDR_BOUND after
4123 * rdma_resolve_ip() is called, eg through the error
4124 * path in addr_handler(). If this happens the existing
4125 * request must be canceled before issuing a new one.
4126 * Since canceling a request is a bit slow and this
4127 * oddball path is rare, keep track once a request has
4128 * been issued. The track turns out to be a permanent
4129 * state since this is the only cancel as it is
4130 * immediately before rdma_resolve_ip().
4131 */
4132 if (id_priv->used_resolve_ip)
4133 rdma_addr_cancel(&id->route.addr.dev_addr);
4134 else
4135 id_priv->used_resolve_ip = 1;
4136 ret = rdma_resolve_ip(cma_src_addr(id_priv), dst_addr,
4137 &id->route.addr.dev_addr,
4138 timeout_ms, addr_handler,
4139 false, id_priv);
4140 }
4141 }
4142 if (ret)
4143 goto err;
4144
4145 return 0;
4146 err:
4147 cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY, RDMA_CM_ADDR_BOUND);
4148 return ret;
4149 }
4150 EXPORT_SYMBOL(rdma_resolve_addr);
4151
4152 int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr)
4153 {
4154 struct rdma_id_private *id_priv =
4155 container_of(id, struct rdma_id_private, id);
4156
4157 return rdma_bind_addr_dst(id_priv, addr, cma_dst_addr(id_priv));
4158 }
4159 EXPORT_SYMBOL(rdma_bind_addr);
4160
4161 static int cma_format_hdr(void *hdr, struct rdma_id_private *id_priv)
4162 {
4163 struct cma_hdr *cma_hdr;
4164
4165 cma_hdr = hdr;
4166 cma_hdr->cma_version = CMA_VERSION;
4167 if (cma_family(id_priv) == AF_INET) {
4168 struct sockaddr_in *src4, *dst4;
4169
4170 src4 = (struct sockaddr_in *) cma_src_addr(id_priv);
4171 dst4 = (struct sockaddr_in *) cma_dst_addr(id_priv);
4172
4173 cma_set_ip_ver(cma_hdr, 4);
4174 cma_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
4175 cma_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
4176 cma_hdr->port = src4->sin_port;
4177 } else if (cma_family(id_priv) == AF_INET6) {
4178 struct sockaddr_in6 *src6, *dst6;
4179
4180 src6 = (struct sockaddr_in6 *) cma_src_addr(id_priv);
4181 dst6 = (struct sockaddr_in6 *) cma_dst_addr(id_priv);
4182
4183 cma_set_ip_ver(cma_hdr, 6);
4184 cma_hdr->src_addr.ip6 = src6->sin6_addr;
4185 cma_hdr->dst_addr.ip6 = dst6->sin6_addr;
4186 cma_hdr->port = src6->sin6_port;
4187 }
4188 return 0;
4189 }
4190
4191 static int cma_sidr_rep_handler(struct ib_cm_id *cm_id,
4192 const struct ib_cm_event *ib_event)
4193 {
4194 struct rdma_id_private *id_priv = cm_id->context;
4195 struct rdma_cm_event event = {};
4196 const struct ib_cm_sidr_rep_event_param *rep =
4197 &ib_event->param.sidr_rep_rcvd;
4198 int ret;
4199
4200 mutex_lock(&id_priv->handler_mutex);
4201 if (READ_ONCE(id_priv->state) != RDMA_CM_CONNECT)
4202 goto out;
4203
4204 switch (ib_event->event) {
4205 case IB_CM_SIDR_REQ_ERROR:
4206 event.event = RDMA_CM_EVENT_UNREACHABLE;
4207 event.status = -ETIMEDOUT;
4208 break;
4209 case IB_CM_SIDR_REP_RECEIVED:
4210 event.param.ud.private_data = ib_event->private_data;
4211 event.param.ud.private_data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
4212 if (rep->status != IB_SIDR_SUCCESS) {
4213 event.event = RDMA_CM_EVENT_UNREACHABLE;
4214 event.status = ib_event->param.sidr_rep_rcvd.status;
4215 pr_debug_ratelimited("RDMA CM: UNREACHABLE: bad SIDR reply. status %d\n",
4216 event.status);
4217 break;
4218 }
4219 ret = cma_set_qkey(id_priv, rep->qkey);
4220 if (ret) {
4221 pr_debug_ratelimited("RDMA CM: ADDR_ERROR: failed to set qkey. status %d\n", ret);
4222 event.event = RDMA_CM_EVENT_ADDR_ERROR;
4223 event.status = ret;
4224 break;
4225 }
4226 ib_init_ah_attr_from_path(id_priv->id.device,
4227 id_priv->id.port_num,
4228 id_priv->id.route.path_rec,
4229 &event.param.ud.ah_attr,
4230 rep->sgid_attr);
4231 event.param.ud.qp_num = rep->qpn;
4232 event.param.ud.qkey = rep->qkey;
4233 event.event = RDMA_CM_EVENT_ESTABLISHED;
4234 event.status = 0;
4235 break;
4236 default:
4237 pr_err("RDMA CMA: unexpected IB CM event: %d\n",
4238 ib_event->event);
4239 goto out;
4240 }
4241
4242 ret = cma_cm_event_handler(id_priv, &event);
4243
4244 rdma_destroy_ah_attr(&event.param.ud.ah_attr);
4245 if (ret) {
4246 /* Destroy the CM ID by returning a non-zero value. */
4247 id_priv->cm_id.ib = NULL;
4248 destroy_id_handler_unlock(id_priv);
4249 return ret;
4250 }
4251 out:
4252 mutex_unlock(&id_priv->handler_mutex);
4253 return 0;
4254 }
4255
4256 static int cma_resolve_ib_udp(struct rdma_id_private *id_priv,
4257 struct rdma_conn_param *conn_param)
4258 {
4259 struct ib_cm_sidr_req_param req;
4260 struct ib_cm_id *id;
4261 void *private_data;
4262 u8 offset;
4263 int ret;
4264
4265 memset(&req, 0, sizeof req);
4266 offset = cma_user_data_offset(id_priv);
4267 if (check_add_overflow(offset, conn_param->private_data_len, &req.private_data_len))
4268 return -EINVAL;
4269
4270 if (req.private_data_len) {
4271 private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
4272 if (!private_data)
4273 return -ENOMEM;
4274 } else {
4275 private_data = NULL;
4276 }
4277
4278 if (conn_param->private_data && conn_param->private_data_len)
4279 memcpy(private_data + offset, conn_param->private_data,
4280 conn_param->private_data_len);
4281
4282 if (private_data) {
4283 ret = cma_format_hdr(private_data, id_priv);
4284 if (ret)
4285 goto out;
4286 req.private_data = private_data;
4287 }
4288
4289 id = ib_create_cm_id(id_priv->id.device, cma_sidr_rep_handler,
4290 id_priv);
4291 if (IS_ERR(id)) {
4292 ret = PTR_ERR(id);
4293 goto out;
4294 }
4295 id_priv->cm_id.ib = id;
4296
4297 req.path = id_priv->id.route.path_rec;
4298 req.sgid_attr = id_priv->id.route.addr.dev_addr.sgid_attr;
4299 req.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
4300 req.timeout_ms = 1 << (CMA_CM_RESPONSE_TIMEOUT - 8);
4301 req.max_cm_retries = CMA_MAX_CM_RETRIES;
4302
4303 trace_cm_send_sidr_req(id_priv);
4304 ret = ib_send_cm_sidr_req(id_priv->cm_id.ib, &req);
4305 if (ret) {
4306 ib_destroy_cm_id(id_priv->cm_id.ib);
4307 id_priv->cm_id.ib = NULL;
4308 }
4309 out:
4310 kfree(private_data);
4311 return ret;
4312 }
4313
4314 static int cma_connect_ib(struct rdma_id_private *id_priv,
4315 struct rdma_conn_param *conn_param)
4316 {
4317 struct ib_cm_req_param req;
4318 struct rdma_route *route;
4319 void *private_data;
4320 struct ib_cm_id *id;
4321 u8 offset;
4322 int ret;
4323
4324 memset(&req, 0, sizeof req);
4325 offset = cma_user_data_offset(id_priv);
4326 if (check_add_overflow(offset, conn_param->private_data_len, &req.private_data_len))
4327 return -EINVAL;
4328
4329 if (req.private_data_len) {
4330 private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
4331 if (!private_data)
4332 return -ENOMEM;
4333 } else {
4334 private_data = NULL;
4335 }
4336
4337 if (conn_param->private_data && conn_param->private_data_len)
4338 memcpy(private_data + offset, conn_param->private_data,
4339 conn_param->private_data_len);
4340
4341 id = ib_create_cm_id(id_priv->id.device, cma_ib_handler, id_priv);
4342 if (IS_ERR(id)) {
4343 ret = PTR_ERR(id);
4344 goto out;
4345 }
4346 id_priv->cm_id.ib = id;
4347
4348 route = &id_priv->id.route;
4349 if (private_data) {
4350 ret = cma_format_hdr(private_data, id_priv);
4351 if (ret)
4352 goto out;
4353 req.private_data = private_data;
4354 }
4355
4356 req.primary_path = &route->path_rec[0];
4357 req.primary_path_inbound = route->path_rec_inbound;
4358 req.primary_path_outbound = route->path_rec_outbound;
4359 if (route->num_pri_alt_paths == 2)
4360 req.alternate_path = &route->path_rec[1];
4361
4362 req.ppath_sgid_attr = id_priv->id.route.addr.dev_addr.sgid_attr;
4363 /* Alternate path SGID attribute currently unsupported */
4364 req.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
4365 req.qp_num = id_priv->qp_num;
4366 req.qp_type = id_priv->id.qp_type;
4367 req.starting_psn = id_priv->seq_num;
4368 req.responder_resources = conn_param->responder_resources;
4369 req.initiator_depth = conn_param->initiator_depth;
4370 req.flow_control = conn_param->flow_control;
4371 req.retry_count = min_t(u8, 7, conn_param->retry_count);
4372 req.rnr_retry_count = min_t(u8, 7, conn_param->rnr_retry_count);
4373 req.remote_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
4374 req.local_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
4375 req.max_cm_retries = CMA_MAX_CM_RETRIES;
4376 req.srq = id_priv->srq ? 1 : 0;
4377 req.ece.vendor_id = id_priv->ece.vendor_id;
4378 req.ece.attr_mod = id_priv->ece.attr_mod;
4379
4380 trace_cm_send_req(id_priv);
4381 ret = ib_send_cm_req(id_priv->cm_id.ib, &req);
4382 out:
4383 if (ret && !IS_ERR(id)) {
4384 ib_destroy_cm_id(id);
4385 id_priv->cm_id.ib = NULL;
4386 }
4387
4388 kfree(private_data);
4389 return ret;
4390 }
4391
4392 static int cma_connect_iw(struct rdma_id_private *id_priv,
4393 struct rdma_conn_param *conn_param)
4394 {
4395 struct iw_cm_id *cm_id;
4396 int ret;
4397 struct iw_cm_conn_param iw_param;
4398
4399 cm_id = iw_create_cm_id(id_priv->id.device, cma_iw_handler, id_priv);
4400 if (IS_ERR(cm_id))
4401 return PTR_ERR(cm_id);
4402
4403 mutex_lock(&id_priv->qp_mutex);
4404 cm_id->tos = id_priv->tos;
4405 cm_id->tos_set = id_priv->tos_set;
4406 mutex_unlock(&id_priv->qp_mutex);
4407
4408 id_priv->cm_id.iw = cm_id;
4409
4410 memcpy(&cm_id->local_addr, cma_src_addr(id_priv),
4411 rdma_addr_size(cma_src_addr(id_priv)));
4412 memcpy(&cm_id->remote_addr, cma_dst_addr(id_priv),
4413 rdma_addr_size(cma_dst_addr(id_priv)));
4414
4415 ret = cma_modify_qp_rtr(id_priv, conn_param);
4416 if (ret)
4417 goto out;
4418
4419 if (conn_param) {
4420 iw_param.ord = conn_param->initiator_depth;
4421 iw_param.ird = conn_param->responder_resources;
4422 iw_param.private_data = conn_param->private_data;
4423 iw_param.private_data_len = conn_param->private_data_len;
4424 iw_param.qpn = id_priv->id.qp ? id_priv->qp_num : conn_param->qp_num;
4425 } else {
4426 memset(&iw_param, 0, sizeof iw_param);
4427 iw_param.qpn = id_priv->qp_num;
4428 }
4429 ret = iw_cm_connect(cm_id, &iw_param);
4430 out:
4431 if (ret) {
4432 iw_destroy_cm_id(cm_id);
4433 id_priv->cm_id.iw = NULL;
4434 }
4435 return ret;
4436 }
4437
4438 /**
4439 * rdma_connect_locked - Initiate an active connection request.
4440 * @id: Connection identifier to connect.
4441 * @conn_param: Connection information used for connected QPs.
4442 *
4443 * Same as rdma_connect() but can only be called from the
4444 * RDMA_CM_EVENT_ROUTE_RESOLVED handler callback.
4445 */
4446 int rdma_connect_locked(struct rdma_cm_id *id,
4447 struct rdma_conn_param *conn_param)
4448 {
4449 struct rdma_id_private *id_priv =
4450 container_of(id, struct rdma_id_private, id);
4451 int ret;
4452
4453 if (!cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_CONNECT))
4454 return -EINVAL;
4455
4456 if (!id->qp) {
4457 id_priv->qp_num = conn_param->qp_num;
4458 id_priv->srq = conn_param->srq;
4459 }
4460
4461 if (rdma_cap_ib_cm(id->device, id->port_num)) {
4462 if (id->qp_type == IB_QPT_UD)
4463 ret = cma_resolve_ib_udp(id_priv, conn_param);
4464 else
4465 ret = cma_connect_ib(id_priv, conn_param);
4466 } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
4467 ret = cma_connect_iw(id_priv, conn_param);
4468 } else {
4469 ret = -ENOSYS;
4470 }
4471 if (ret)
4472 goto err_state;
4473 return 0;
4474 err_state:
4475 cma_comp_exch(id_priv, RDMA_CM_CONNECT, RDMA_CM_ROUTE_RESOLVED);
4476 return ret;
4477 }
4478 EXPORT_SYMBOL(rdma_connect_locked);
4479
4480 /**
4481 * rdma_connect - Initiate an active connection request.
4482 * @id: Connection identifier to connect.
4483 * @conn_param: Connection information used for connected QPs.
4484 *
4485 * Users must have resolved a route for the rdma_cm_id to connect with by having
4486 * called rdma_resolve_route before calling this routine.
4487 *
4488 * This call will either connect to a remote QP or obtain remote QP information
4489 * for unconnected rdma_cm_id's. The actual operation is based on the
4490 * rdma_cm_id's port space.
4491 */
4492 int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
4493 {
4494 struct rdma_id_private *id_priv =
4495 container_of(id, struct rdma_id_private, id);
4496 int ret;
4497
4498 mutex_lock(&id_priv->handler_mutex);
4499 ret = rdma_connect_locked(id, conn_param);
4500 mutex_unlock(&id_priv->handler_mutex);
4501 return ret;
4502 }
4503 EXPORT_SYMBOL(rdma_connect);
4504
4505 /**
4506 * rdma_connect_ece - Initiate an active connection request with ECE data.
4507 * @id: Connection identifier to connect.
4508 * @conn_param: Connection information used for connected QPs.
4509 * @ece: ECE parameters
4510 *
4511 * See rdma_connect() explanation.
4512 */
4513 int rdma_connect_ece(struct rdma_cm_id *id, struct rdma_conn_param *conn_param,
4514 struct rdma_ucm_ece *ece)
4515 {
4516 struct rdma_id_private *id_priv =
4517 container_of(id, struct rdma_id_private, id);
4518
4519 id_priv->ece.vendor_id = ece->vendor_id;
4520 id_priv->ece.attr_mod = ece->attr_mod;
4521
4522 return rdma_connect(id, conn_param);
4523 }
4524 EXPORT_SYMBOL(rdma_connect_ece);
4525
4526 static int cma_accept_ib(struct rdma_id_private *id_priv,
4527 struct rdma_conn_param *conn_param)
4528 {
4529 struct ib_cm_rep_param rep;
4530 int ret;
4531
4532 ret = cma_modify_qp_rtr(id_priv, conn_param);
4533 if (ret)
4534 goto out;
4535
4536 ret = cma_modify_qp_rts(id_priv, conn_param);
4537 if (ret)
4538 goto out;
4539
4540 memset(&rep, 0, sizeof rep);
4541 rep.qp_num = id_priv->qp_num;
4542 rep.starting_psn = id_priv->seq_num;
4543 rep.private_data = conn_param->private_data;
4544 rep.private_data_len = conn_param->private_data_len;
4545 rep.responder_resources = conn_param->responder_resources;
4546 rep.initiator_depth = conn_param->initiator_depth;
4547 rep.failover_accepted = 0;
4548 rep.flow_control = conn_param->flow_control;
4549 rep.rnr_retry_count = min_t(u8, 7, conn_param->rnr_retry_count);
4550 rep.srq = id_priv->srq ? 1 : 0;
4551 rep.ece.vendor_id = id_priv->ece.vendor_id;
4552 rep.ece.attr_mod = id_priv->ece.attr_mod;
4553
4554 trace_cm_send_rep(id_priv);
4555 ret = ib_send_cm_rep(id_priv->cm_id.ib, &rep);
4556 out:
4557 return ret;
4558 }
4559
4560 static int cma_accept_iw(struct rdma_id_private *id_priv,
4561 struct rdma_conn_param *conn_param)
4562 {
4563 struct iw_cm_conn_param iw_param;
4564 int ret;
4565
4566 if (!conn_param)
4567 return -EINVAL;
4568
4569 ret = cma_modify_qp_rtr(id_priv, conn_param);
4570 if (ret)
4571 return ret;
4572
4573 iw_param.ord = conn_param->initiator_depth;
4574 iw_param.ird = conn_param->responder_resources;
4575 iw_param.private_data = conn_param->private_data;
4576 iw_param.private_data_len = conn_param->private_data_len;
4577 if (id_priv->id.qp)
4578 iw_param.qpn = id_priv->qp_num;
4579 else
4580 iw_param.qpn = conn_param->qp_num;
4581
4582 return iw_cm_accept(id_priv->cm_id.iw, &iw_param);
4583 }
4584
4585 static int cma_send_sidr_rep(struct rdma_id_private *id_priv,
4586 enum ib_cm_sidr_status status, u32 qkey,
4587 const void *private_data, int private_data_len)
4588 {
4589 struct ib_cm_sidr_rep_param rep;
4590 int ret;
4591
4592 memset(&rep, 0, sizeof rep);
4593 rep.status = status;
4594 if (status == IB_SIDR_SUCCESS) {
4595 if (qkey)
4596 ret = cma_set_qkey(id_priv, qkey);
4597 else
4598 ret = cma_set_default_qkey(id_priv);
4599 if (ret)
4600 return ret;
4601 rep.qp_num = id_priv->qp_num;
4602 rep.qkey = id_priv->qkey;
4603
4604 rep.ece.vendor_id = id_priv->ece.vendor_id;
4605 rep.ece.attr_mod = id_priv->ece.attr_mod;
4606 }
4607
4608 rep.private_data = private_data;
4609 rep.private_data_len = private_data_len;
4610
4611 trace_cm_send_sidr_rep(id_priv);
4612 return ib_send_cm_sidr_rep(id_priv->cm_id.ib, &rep);
4613 }
4614
4615 /**
4616 * rdma_accept - Called to accept a connection request or response.
4617 * @id: Connection identifier associated with the request.
4618 * @conn_param: Information needed to establish the connection. This must be
4619 * provided if accepting a connection request. If accepting a connection
4620 * response, this parameter must be NULL.
4621 *
4622 * Typically, this routine is only called by the listener to accept a connection
4623 * request. It must also be called on the active side of a connection if the
4624 * user is performing their own QP transitions.
4625 *
4626 * In the case of error, a reject message is sent to the remote side and the
4627 * state of the qp associated with the id is modified to error, such that any
4628 * previously posted receive buffers would be flushed.
4629 *
4630 * This function is for use by kernel ULPs and must be called from under the
4631 * handler callback.
4632 */
4633 int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
4634 {
4635 struct rdma_id_private *id_priv =
4636 container_of(id, struct rdma_id_private, id);
4637 int ret;
4638
4639 lockdep_assert_held(&id_priv->handler_mutex);
4640
4641 if (READ_ONCE(id_priv->state) != RDMA_CM_CONNECT)
4642 return -EINVAL;
4643
4644 if (!id->qp && conn_param) {
4645 id_priv->qp_num = conn_param->qp_num;
4646 id_priv->srq = conn_param->srq;
4647 }
4648
4649 if (rdma_cap_ib_cm(id->device, id->port_num)) {
4650 if (id->qp_type == IB_QPT_UD) {
4651 if (conn_param)
4652 ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
4653 conn_param->qkey,
4654 conn_param->private_data,
4655 conn_param->private_data_len);
4656 else
4657 ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
4658 0, NULL, 0);
4659 } else {
4660 if (conn_param)
4661 ret = cma_accept_ib(id_priv, conn_param);
4662 else
4663 ret = cma_rep_recv(id_priv);
4664 }
4665 } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
4666 ret = cma_accept_iw(id_priv, conn_param);
4667 } else {
4668 ret = -ENOSYS;
4669 }
4670 if (ret)
4671 goto reject;
4672
4673 return 0;
4674 reject:
4675 cma_modify_qp_err(id_priv);
4676 rdma_reject(id, NULL, 0, IB_CM_REJ_CONSUMER_DEFINED);
4677 return ret;
4678 }
4679 EXPORT_SYMBOL(rdma_accept);
4680
4681 int rdma_accept_ece(struct rdma_cm_id *id, struct rdma_conn_param *conn_param,
4682 struct rdma_ucm_ece *ece)
4683 {
4684 struct rdma_id_private *id_priv =
4685 container_of(id, struct rdma_id_private, id);
4686
4687 id_priv->ece.vendor_id = ece->vendor_id;
4688 id_priv->ece.attr_mod = ece->attr_mod;
4689
4690 return rdma_accept(id, conn_param);
4691 }
4692 EXPORT_SYMBOL(rdma_accept_ece);
4693
4694 void rdma_lock_handler(struct rdma_cm_id *id)
4695 {
4696 struct rdma_id_private *id_priv =
4697 container_of(id, struct rdma_id_private, id);
4698
4699 mutex_lock(&id_priv->handler_mutex);
4700 }
4701 EXPORT_SYMBOL(rdma_lock_handler);
4702
4703 void rdma_unlock_handler(struct rdma_cm_id *id)
4704 {
4705 struct rdma_id_private *id_priv =
4706 container_of(id, struct rdma_id_private, id);
4707
4708 mutex_unlock(&id_priv->handler_mutex);
4709 }
4710 EXPORT_SYMBOL(rdma_unlock_handler);
4711
4712 int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event)
4713 {
4714 struct rdma_id_private *id_priv;
4715 int ret;
4716
4717 id_priv = container_of(id, struct rdma_id_private, id);
4718 if (!id_priv->cm_id.ib)
4719 return -EINVAL;
4720
4721 switch (id->device->node_type) {
4722 case RDMA_NODE_IB_CA:
4723 ret = ib_cm_notify(id_priv->cm_id.ib, event);
4724 break;
4725 default:
4726 ret = 0;
4727 break;
4728 }
4729 return ret;
4730 }
4731 EXPORT_SYMBOL(rdma_notify);
4732
4733 int rdma_reject(struct rdma_cm_id *id, const void *private_data,
4734 u8 private_data_len, u8 reason)
4735 {
4736 struct rdma_id_private *id_priv;
4737 int ret;
4738
4739 id_priv = container_of(id, struct rdma_id_private, id);
4740 if (!id_priv->cm_id.ib)
4741 return -EINVAL;
4742
4743 if (rdma_cap_ib_cm(id->device, id->port_num)) {
4744 if (id->qp_type == IB_QPT_UD) {
4745 ret = cma_send_sidr_rep(id_priv, IB_SIDR_REJECT, 0,
4746 private_data, private_data_len);
4747 } else {
4748 trace_cm_send_rej(id_priv);
4749 ret = ib_send_cm_rej(id_priv->cm_id.ib, reason, NULL, 0,
4750 private_data, private_data_len);
4751 }
4752 } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
4753 ret = iw_cm_reject(id_priv->cm_id.iw,
4754 private_data, private_data_len);
4755 } else {
4756 ret = -ENOSYS;
4757 }
4758
4759 return ret;
4760 }
4761 EXPORT_SYMBOL(rdma_reject);
4762
4763 int rdma_disconnect(struct rdma_cm_id *id)
4764 {
4765 struct rdma_id_private *id_priv;
4766 int ret;
4767
4768 id_priv = container_of(id, struct rdma_id_private, id);
4769 if (!id_priv->cm_id.ib)
4770 return -EINVAL;
4771
4772 if (rdma_cap_ib_cm(id->device, id->port_num)) {
4773 ret = cma_modify_qp_err(id_priv);
4774 if (ret)
4775 goto out;
4776 /* Initiate or respond to a disconnect. */
4777 trace_cm_disconnect(id_priv);
4778 if (ib_send_cm_dreq(id_priv->cm_id.ib, NULL, 0)) {
4779 if (!ib_send_cm_drep(id_priv->cm_id.ib, NULL, 0))
4780 trace_cm_sent_drep(id_priv);
4781 } else {
4782 trace_cm_sent_dreq(id_priv);
4783 }
4784 } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
4785 ret = iw_cm_disconnect(id_priv->cm_id.iw, 0);
4786 } else
4787 ret = -EINVAL;
4788
4789 out:
4790 return ret;
4791 }
4792 EXPORT_SYMBOL(rdma_disconnect);
4793
4794 static void cma_make_mc_event(int status, struct rdma_id_private *id_priv,
4795 struct ib_sa_multicast *multicast,
4796 struct rdma_cm_event *event,
4797 struct cma_multicast *mc)
4798 {
4799 struct rdma_dev_addr *dev_addr;
4800 enum ib_gid_type gid_type;
4801 struct net_device *ndev;
4802
4803 if (status)
4804 pr_debug_ratelimited("RDMA CM: MULTICAST_ERROR: failed to join multicast. status %d\n",
4805 status);
4806
4807 event->status = status;
4808 event->param.ud.private_data = mc->context;
4809 if (status) {
4810 event->event = RDMA_CM_EVENT_MULTICAST_ERROR;
4811 return;
4812 }
4813
4814 dev_addr = &id_priv->id.route.addr.dev_addr;
4815 ndev = dev_get_by_index(dev_addr->net, dev_addr->bound_dev_if);
4816 gid_type =
4817 id_priv->cma_dev
4818 ->default_gid_type[id_priv->id.port_num -
4819 rdma_start_port(
4820 id_priv->cma_dev->device)];
4821
4822 event->event = RDMA_CM_EVENT_MULTICAST_JOIN;
4823 if (ib_init_ah_from_mcmember(id_priv->id.device, id_priv->id.port_num,
4824 &multicast->rec, ndev, gid_type,
4825 &event->param.ud.ah_attr)) {
4826 event->event = RDMA_CM_EVENT_MULTICAST_ERROR;
4827 goto out;
4828 }
4829
4830 event->param.ud.qp_num = 0xFFFFFF;
4831 event->param.ud.qkey = id_priv->qkey;
4832
4833 out:
4834 dev_put(ndev);
4835 }
4836
4837 static int cma_ib_mc_handler(int status, struct ib_sa_multicast *multicast)
4838 {
4839 struct cma_multicast *mc = multicast->context;
4840 struct rdma_id_private *id_priv = mc->id_priv;
4841 struct rdma_cm_event event = {};
4842 int ret = 0;
4843
4844 mutex_lock(&id_priv->handler_mutex);
4845 if (READ_ONCE(id_priv->state) == RDMA_CM_DEVICE_REMOVAL ||
4846 READ_ONCE(id_priv->state) == RDMA_CM_DESTROYING)
4847 goto out;
4848
4849 ret = cma_set_qkey(id_priv, be32_to_cpu(multicast->rec.qkey));
4850 if (!ret) {
4851 cma_make_mc_event(status, id_priv, multicast, &event, mc);
4852 ret = cma_cm_event_handler(id_priv, &event);
4853 }
4854 rdma_destroy_ah_attr(&event.param.ud.ah_attr);
4855 WARN_ON(ret);
4856
4857 out:
4858 mutex_unlock(&id_priv->handler_mutex);
4859 return 0;
4860 }
4861
4862 static void cma_set_mgid(struct rdma_id_private *id_priv,
4863 struct sockaddr *addr, union ib_gid *mgid)
4864 {
4865 unsigned char mc_map[MAX_ADDR_LEN];
4866 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
4867 struct sockaddr_in *sin = (struct sockaddr_in *) addr;
4868 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) addr;
4869
4870 if (cma_any_addr(addr)) {
4871 memset(mgid, 0, sizeof *mgid);
4872 } else if ((addr->sa_family == AF_INET6) &&
4873 ((be32_to_cpu(sin6->sin6_addr.s6_addr32[0]) & 0xFFF0FFFF) ==
4874 0xFF10A01B)) {
4875 /* IPv6 address is an SA assigned MGID. */
4876 memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
4877 } else if (addr->sa_family == AF_IB) {
4878 memcpy(mgid, &((struct sockaddr_ib *) addr)->sib_addr, sizeof *mgid);
4879 } else if (addr->sa_family == AF_INET6) {
4880 ipv6_ib_mc_map(&sin6->sin6_addr, dev_addr->broadcast, mc_map);
4881 if (id_priv->id.ps == RDMA_PS_UDP)
4882 mc_map[7] = 0x01; /* Use RDMA CM signature */
4883 *mgid = *(union ib_gid *) (mc_map + 4);
4884 } else {
4885 ip_ib_mc_map(sin->sin_addr.s_addr, dev_addr->broadcast, mc_map);
4886 if (id_priv->id.ps == RDMA_PS_UDP)
4887 mc_map[7] = 0x01; /* Use RDMA CM signature */
4888 *mgid = *(union ib_gid *) (mc_map + 4);
4889 }
4890 }
4891
4892 static int cma_join_ib_multicast(struct rdma_id_private *id_priv,
4893 struct cma_multicast *mc)
4894 {
4895 struct ib_sa_mcmember_rec rec;
4896 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
4897 ib_sa_comp_mask comp_mask;
4898 int ret;
4899
4900 ib_addr_get_mgid(dev_addr, &rec.mgid);
4901 ret = ib_sa_get_mcmember_rec(id_priv->id.device, id_priv->id.port_num,
4902 &rec.mgid, &rec);
4903 if (ret)
4904 return ret;
4905
4906 if (!id_priv->qkey) {
4907 ret = cma_set_default_qkey(id_priv);
4908 if (ret)
4909 return ret;
4910 }
4911
4912 cma_set_mgid(id_priv, (struct sockaddr *) &mc->addr, &rec.mgid);
4913 rec.qkey = cpu_to_be32(id_priv->qkey);
4914 rdma_addr_get_sgid(dev_addr, &rec.port_gid);
4915 rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
4916 rec.join_state = mc->join_state;
4917
4918 comp_mask = IB_SA_MCMEMBER_REC_MGID | IB_SA_MCMEMBER_REC_PORT_GID |
4919 IB_SA_MCMEMBER_REC_PKEY | IB_SA_MCMEMBER_REC_JOIN_STATE |
4920 IB_SA_MCMEMBER_REC_QKEY | IB_SA_MCMEMBER_REC_SL |
4921 IB_SA_MCMEMBER_REC_FLOW_LABEL |
4922 IB_SA_MCMEMBER_REC_TRAFFIC_CLASS;
4923
4924 if (id_priv->id.ps == RDMA_PS_IPOIB)
4925 comp_mask |= IB_SA_MCMEMBER_REC_RATE |
4926 IB_SA_MCMEMBER_REC_RATE_SELECTOR |
4927 IB_SA_MCMEMBER_REC_MTU_SELECTOR |
4928 IB_SA_MCMEMBER_REC_MTU |
4929 IB_SA_MCMEMBER_REC_HOP_LIMIT;
4930
4931 mc->sa_mc = ib_sa_join_multicast(&sa_client, id_priv->id.device,
4932 id_priv->id.port_num, &rec, comp_mask,
4933 GFP_KERNEL, cma_ib_mc_handler, mc);
4934 return PTR_ERR_OR_ZERO(mc->sa_mc);
4935 }
4936
4937 static void cma_iboe_set_mgid(struct sockaddr *addr, union ib_gid *mgid,
4938 enum ib_gid_type gid_type)
4939 {
4940 struct sockaddr_in *sin = (struct sockaddr_in *)addr;
4941 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr;
4942
4943 if (cma_any_addr(addr)) {
4944 memset(mgid, 0, sizeof *mgid);
4945 } else if (addr->sa_family == AF_INET6) {
4946 memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
4947 } else {
4948 mgid->raw[0] =
4949 (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) ? 0 : 0xff;
4950 mgid->raw[1] =
4951 (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) ? 0 : 0x0e;
4952 mgid->raw[2] = 0;
4953 mgid->raw[3] = 0;
4954 mgid->raw[4] = 0;
4955 mgid->raw[5] = 0;
4956 mgid->raw[6] = 0;
4957 mgid->raw[7] = 0;
4958 mgid->raw[8] = 0;
4959 mgid->raw[9] = 0;
4960 mgid->raw[10] = 0xff;
4961 mgid->raw[11] = 0xff;
4962 *(__be32 *)(&mgid->raw[12]) = sin->sin_addr.s_addr;
4963 }
4964 }
4965
4966 static int cma_iboe_join_multicast(struct rdma_id_private *id_priv,
4967 struct cma_multicast *mc)
4968 {
4969 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
4970 int err = 0;
4971 struct sockaddr *addr = (struct sockaddr *)&mc->addr;
4972 struct net_device *ndev = NULL;
4973 struct ib_sa_multicast ib = {};
4974 enum ib_gid_type gid_type;
4975 bool send_only;
4976
4977 send_only = mc->join_state == BIT(SENDONLY_FULLMEMBER_JOIN);
4978
4979 if (cma_zero_addr(addr))
4980 return -EINVAL;
4981
4982 gid_type = id_priv->cma_dev->default_gid_type[id_priv->id.port_num -
4983 rdma_start_port(id_priv->cma_dev->device)];
4984 cma_iboe_set_mgid(addr, &ib.rec.mgid, gid_type);
4985
4986 ib.rec.pkey = cpu_to_be16(0xffff);
4987 if (dev_addr->bound_dev_if)
4988 ndev = dev_get_by_index(dev_addr->net, dev_addr->bound_dev_if);
4989 if (!ndev)
4990 return -ENODEV;
4991
4992 ib.rec.rate = IB_RATE_PORT_CURRENT;
4993 ib.rec.hop_limit = 1;
4994 ib.rec.mtu = iboe_get_mtu(ndev->mtu);
4995
4996 if (addr->sa_family == AF_INET) {
4997 if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) {
4998 ib.rec.hop_limit = IPV6_DEFAULT_HOPLIMIT;
4999 if (!send_only) {
5000 err = cma_igmp_send(ndev, &ib.rec.mgid,
5001 true);
5002 }
5003 }
5004 } else {
5005 if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP)
5006 err = -ENOTSUPP;
5007 }
5008 dev_put(ndev);
5009 if (err || !ib.rec.mtu)
5010 return err ?: -EINVAL;
5011
5012 if (!id_priv->qkey)
5013 cma_set_default_qkey(id_priv);
5014
5015 rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
5016 &ib.rec.port_gid);
5017 INIT_WORK(&mc->iboe_join.work, cma_iboe_join_work_handler);
5018 cma_make_mc_event(0, id_priv, &ib, &mc->iboe_join.event, mc);
5019 queue_work(cma_wq, &mc->iboe_join.work);
5020 return 0;
5021 }
5022
5023 int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
5024 u8 join_state, void *context)
5025 {
5026 struct rdma_id_private *id_priv =
5027 container_of(id, struct rdma_id_private, id);
5028 struct cma_multicast *mc;
5029 int ret;
5030
5031 /* Not supported for kernel QPs */
5032 if (WARN_ON(id->qp))
5033 return -EINVAL;
5034
5035 /* ULP is calling this wrong. */
5036 if (!id->device || (READ_ONCE(id_priv->state) != RDMA_CM_ADDR_BOUND &&
5037 READ_ONCE(id_priv->state) != RDMA_CM_ADDR_RESOLVED))
5038 return -EINVAL;
5039
5040 if (id_priv->id.qp_type != IB_QPT_UD)
5041 return -EINVAL;
5042
5043 mc = kzalloc(sizeof(*mc), GFP_KERNEL);
5044 if (!mc)
5045 return -ENOMEM;
5046
5047 memcpy(&mc->addr, addr, rdma_addr_size(addr));
5048 mc->context = context;
5049 mc->id_priv = id_priv;
5050 mc->join_state = join_state;
5051
5052 if (rdma_protocol_roce(id->device, id->port_num)) {
5053 ret = cma_iboe_join_multicast(id_priv, mc);
5054 if (ret)
5055 goto out_err;
5056 } else if (rdma_cap_ib_mcast(id->device, id->port_num)) {
5057 ret = cma_join_ib_multicast(id_priv, mc);
5058 if (ret)
5059 goto out_err;
5060 } else {
5061 ret = -ENOSYS;
5062 goto out_err;
5063 }
5064
5065 spin_lock(&id_priv->lock);
5066 list_add(&mc->list, &id_priv->mc_list);
5067 spin_unlock(&id_priv->lock);
5068
5069 return 0;
5070 out_err:
5071 kfree(mc);
5072 return ret;
5073 }
5074 EXPORT_SYMBOL(rdma_join_multicast);
5075
5076 void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr)
5077 {
5078 struct rdma_id_private *id_priv;
5079 struct cma_multicast *mc;
5080
5081 id_priv = container_of(id, struct rdma_id_private, id);
5082 spin_lock_irq(&id_priv->lock);
5083 list_for_each_entry(mc, &id_priv->mc_list, list) {
5084 if (memcmp(&mc->addr, addr, rdma_addr_size(addr)) != 0)
5085 continue;
5086 list_del(&mc->list);
5087 spin_unlock_irq(&id_priv->lock);
5088
5089 WARN_ON(id_priv->cma_dev->device != id->device);
5090 destroy_mc(id_priv, mc);
5091 return;
5092 }
5093 spin_unlock_irq(&id_priv->lock);
5094 }
5095 EXPORT_SYMBOL(rdma_leave_multicast);
5096
5097 static int cma_netdev_change(struct net_device *ndev, struct rdma_id_private *id_priv)
5098 {
5099 struct rdma_dev_addr *dev_addr;
5100 struct cma_work *work;
5101
5102 dev_addr = &id_priv->id.route.addr.dev_addr;
5103
5104 if ((dev_addr->bound_dev_if == ndev->ifindex) &&
5105 (net_eq(dev_net(ndev), dev_addr->net)) &&
5106 memcmp(dev_addr->src_dev_addr, ndev->dev_addr, ndev->addr_len)) {
5107 pr_info("RDMA CM addr change for ndev %s used by id %p\n",
5108 ndev->name, &id_priv->id);
5109 work = kzalloc(sizeof *work, GFP_KERNEL);
5110 if (!work)
5111 return -ENOMEM;
5112
5113 INIT_WORK(&work->work, cma_work_handler);
5114 work->id = id_priv;
5115 work->event.event = RDMA_CM_EVENT_ADDR_CHANGE;
5116 cma_id_get(id_priv);
5117 queue_work(cma_wq, &work->work);
5118 }
5119
5120 return 0;
5121 }
5122
5123 static int cma_netdev_callback(struct notifier_block *self, unsigned long event,
5124 void *ptr)
5125 {
5126 struct net_device *ndev = netdev_notifier_info_to_dev(ptr);
5127 struct cma_device *cma_dev;
5128 struct rdma_id_private *id_priv;
5129 int ret = NOTIFY_DONE;
5130
5131 if (event != NETDEV_BONDING_FAILOVER)
5132 return NOTIFY_DONE;
5133
5134 if (!netif_is_bond_master(ndev))
5135 return NOTIFY_DONE;
5136
5137 mutex_lock(&lock);
5138 list_for_each_entry(cma_dev, &dev_list, list)
5139 list_for_each_entry(id_priv, &cma_dev->id_list, device_item) {
5140 ret = cma_netdev_change(ndev, id_priv);
5141 if (ret)
5142 goto out;
5143 }
5144
5145 out:
5146 mutex_unlock(&lock);
5147 return ret;
5148 }
5149
5150 static void cma_netevent_work_handler(struct work_struct *_work)
5151 {
5152 struct rdma_id_private *id_priv =
5153 container_of(_work, struct rdma_id_private, id.net_work);
5154 struct rdma_cm_event event = {};
5155
5156 mutex_lock(&id_priv->handler_mutex);
5157
5158 if (READ_ONCE(id_priv->state) == RDMA_CM_DESTROYING ||
5159 READ_ONCE(id_priv->state) == RDMA_CM_DEVICE_REMOVAL)
5160 goto out_unlock;
5161
5162 event.event = RDMA_CM_EVENT_UNREACHABLE;
5163 event.status = -ETIMEDOUT;
5164
5165 if (cma_cm_event_handler(id_priv, &event)) {
5166 __acquire(&id_priv->handler_mutex);
5167 id_priv->cm_id.ib = NULL;
5168 cma_id_put(id_priv);
5169 destroy_id_handler_unlock(id_priv);
5170 return;
5171 }
5172
5173 out_unlock:
5174 mutex_unlock(&id_priv->handler_mutex);
5175 cma_id_put(id_priv);
5176 }
5177
5178 static int cma_netevent_callback(struct notifier_block *self,
5179 unsigned long event, void *ctx)
5180 {
5181 struct id_table_entry *ips_node = NULL;
5182 struct rdma_id_private *current_id;
5183 struct neighbour *neigh = ctx;
5184 unsigned long flags;
5185
5186 if (event != NETEVENT_NEIGH_UPDATE)
5187 return NOTIFY_DONE;
5188
5189 spin_lock_irqsave(&id_table_lock, flags);
5190 if (neigh->tbl->family == AF_INET6) {
5191 struct sockaddr_in6 neigh_sock_6;
5192
5193 neigh_sock_6.sin6_family = AF_INET6;
5194 neigh_sock_6.sin6_addr = *(struct in6_addr *)neigh->primary_key;
5195 ips_node = node_from_ndev_ip(&id_table, neigh->dev->ifindex,
5196 (struct sockaddr *)&neigh_sock_6);
5197 } else if (neigh->tbl->family == AF_INET) {
5198 struct sockaddr_in neigh_sock_4;
5199
5200 neigh_sock_4.sin_family = AF_INET;
5201 neigh_sock_4.sin_addr.s_addr = *(__be32 *)(neigh->primary_key);
5202 ips_node = node_from_ndev_ip(&id_table, neigh->dev->ifindex,
5203 (struct sockaddr *)&neigh_sock_4);
5204 } else
5205 goto out;
5206
5207 if (!ips_node)
5208 goto out;
5209
5210 list_for_each_entry(current_id, &ips_node->id_list, id_list_entry) {
5211 if (!memcmp(current_id->id.route.addr.dev_addr.dst_dev_addr,
5212 neigh->ha, ETH_ALEN))
5213 continue;
5214 INIT_WORK(&current_id->id.net_work, cma_netevent_work_handler);
5215 cma_id_get(current_id);
5216 queue_work(cma_wq, &current_id->id.net_work);
5217 }
5218 out:
5219 spin_unlock_irqrestore(&id_table_lock, flags);
5220 return NOTIFY_DONE;
5221 }
5222
5223 static struct notifier_block cma_nb = {
5224 .notifier_call = cma_netdev_callback
5225 };
5226
5227 static struct notifier_block cma_netevent_cb = {
5228 .notifier_call = cma_netevent_callback
5229 };
5230
5231 static void cma_send_device_removal_put(struct rdma_id_private *id_priv)
5232 {
5233 struct rdma_cm_event event = { .event = RDMA_CM_EVENT_DEVICE_REMOVAL };
5234 enum rdma_cm_state state;
5235 unsigned long flags;
5236
5237 mutex_lock(&id_priv->handler_mutex);
5238 /* Record that we want to remove the device */
5239 spin_lock_irqsave(&id_priv->lock, flags);
5240 state = id_priv->state;
5241 if (state == RDMA_CM_DESTROYING || state == RDMA_CM_DEVICE_REMOVAL) {
5242 spin_unlock_irqrestore(&id_priv->lock, flags);
5243 mutex_unlock(&id_priv->handler_mutex);
5244 cma_id_put(id_priv);
5245 return;
5246 }
5247 id_priv->state = RDMA_CM_DEVICE_REMOVAL;
5248 spin_unlock_irqrestore(&id_priv->lock, flags);
5249
5250 if (cma_cm_event_handler(id_priv, &event)) {
5251 /*
5252 * At this point the ULP promises it won't call
5253 * rdma_destroy_id() concurrently
5254 */
5255 cma_id_put(id_priv);
5256 mutex_unlock(&id_priv->handler_mutex);
5257 trace_cm_id_destroy(id_priv);
5258 _destroy_id(id_priv, state);
5259 return;
5260 }
5261 mutex_unlock(&id_priv->handler_mutex);
5262
5263 /*
5264 * If this races with destroy then the thread that first assigns state
5265 * to a destroying does the cancel.
5266 */
5267 cma_cancel_operation(id_priv, state);
5268 cma_id_put(id_priv);
5269 }
5270
5271 static void cma_process_remove(struct cma_device *cma_dev)
5272 {
5273 mutex_lock(&lock);
5274 while (!list_empty(&cma_dev->id_list)) {
5275 struct rdma_id_private *id_priv = list_first_entry(
5276 &cma_dev->id_list, struct rdma_id_private, device_item);
5277
5278 list_del_init(&id_priv->listen_item);
5279 list_del_init(&id_priv->device_item);
5280 cma_id_get(id_priv);
5281 mutex_unlock(&lock);
5282
5283 cma_send_device_removal_put(id_priv);
5284
5285 mutex_lock(&lock);
5286 }
5287 mutex_unlock(&lock);
5288
5289 cma_dev_put(cma_dev);
5290 wait_for_completion(&cma_dev->comp);
5291 }
5292
5293 static bool cma_supported(struct ib_device *device)
5294 {
5295 u32 i;
5296
5297 rdma_for_each_port(device, i) {
5298 if (rdma_cap_ib_cm(device, i) || rdma_cap_iw_cm(device, i))
5299 return true;
5300 }
5301 return false;
5302 }
5303
5304 static int cma_add_one(struct ib_device *device)
5305 {
5306 struct rdma_id_private *to_destroy;
5307 struct cma_device *cma_dev;
5308 struct rdma_id_private *id_priv;
5309 unsigned long supported_gids = 0;
5310 int ret;
5311 u32 i;
5312
5313 if (!cma_supported(device))
5314 return -EOPNOTSUPP;
5315
5316 cma_dev = kmalloc(sizeof(*cma_dev), GFP_KERNEL);
5317 if (!cma_dev)
5318 return -ENOMEM;
5319
5320 cma_dev->device = device;
5321 cma_dev->default_gid_type = kcalloc(device->phys_port_cnt,
5322 sizeof(*cma_dev->default_gid_type),
5323 GFP_KERNEL);
5324 if (!cma_dev->default_gid_type) {
5325 ret = -ENOMEM;
5326 goto free_cma_dev;
5327 }
5328
5329 cma_dev->default_roce_tos = kcalloc(device->phys_port_cnt,
5330 sizeof(*cma_dev->default_roce_tos),
5331 GFP_KERNEL);
5332 if (!cma_dev->default_roce_tos) {
5333 ret = -ENOMEM;
5334 goto free_gid_type;
5335 }
5336
5337 rdma_for_each_port (device, i) {
5338 supported_gids = roce_gid_type_mask_support(device, i);
5339 WARN_ON(!supported_gids);
5340 if (supported_gids & (1 << CMA_PREFERRED_ROCE_GID_TYPE))
5341 cma_dev->default_gid_type[i - rdma_start_port(device)] =
5342 CMA_PREFERRED_ROCE_GID_TYPE;
5343 else
5344 cma_dev->default_gid_type[i - rdma_start_port(device)] =
5345 find_first_bit(&supported_gids, BITS_PER_LONG);
5346 cma_dev->default_roce_tos[i - rdma_start_port(device)] = 0;
5347 }
5348
5349 init_completion(&cma_dev->comp);
5350 refcount_set(&cma_dev->refcount, 1);
5351 INIT_LIST_HEAD(&cma_dev->id_list);
5352 ib_set_client_data(device, &cma_client, cma_dev);
5353
5354 mutex_lock(&lock);
5355 list_add_tail(&cma_dev->list, &dev_list);
5356 list_for_each_entry(id_priv, &listen_any_list, listen_any_item) {
5357 ret = cma_listen_on_dev(id_priv, cma_dev, &to_destroy);
5358 if (ret)
5359 goto free_listen;
5360 }
5361 mutex_unlock(&lock);
5362
5363 trace_cm_add_one(device);
5364 return 0;
5365
5366 free_listen:
5367 list_del(&cma_dev->list);
5368 mutex_unlock(&lock);
5369
5370 /* cma_process_remove() will delete to_destroy */
5371 cma_process_remove(cma_dev);
5372 kfree(cma_dev->default_roce_tos);
5373 free_gid_type:
5374 kfree(cma_dev->default_gid_type);
5375
5376 free_cma_dev:
5377 kfree(cma_dev);
5378 return ret;
5379 }
5380
5381 static void cma_remove_one(struct ib_device *device, void *client_data)
5382 {
5383 struct cma_device *cma_dev = client_data;
5384
5385 trace_cm_remove_one(device);
5386
5387 mutex_lock(&lock);
5388 list_del(&cma_dev->list);
5389 mutex_unlock(&lock);
5390
5391 cma_process_remove(cma_dev);
5392 kfree(cma_dev->default_roce_tos);
5393 kfree(cma_dev->default_gid_type);
5394 kfree(cma_dev);
5395 }
5396
5397 static int cma_init_net(struct net *net)
5398 {
5399 struct cma_pernet *pernet = cma_pernet(net);
5400
5401 xa_init(&pernet->tcp_ps);
5402 xa_init(&pernet->udp_ps);
5403 xa_init(&pernet->ipoib_ps);
5404 xa_init(&pernet->ib_ps);
5405
5406 return 0;
5407 }
5408
5409 static void cma_exit_net(struct net *net)
5410 {
5411 struct cma_pernet *pernet = cma_pernet(net);
5412
5413 WARN_ON(!xa_empty(&pernet->tcp_ps));
5414 WARN_ON(!xa_empty(&pernet->udp_ps));
5415 WARN_ON(!xa_empty(&pernet->ipoib_ps));
5416 WARN_ON(!xa_empty(&pernet->ib_ps));
5417 }
5418
5419 static struct pernet_operations cma_pernet_operations = {
5420 .init = cma_init_net,
5421 .exit = cma_exit_net,
5422 .id = &cma_pernet_id,
5423 .size = sizeof(struct cma_pernet),
5424 };
5425
5426 static int __init cma_init(void)
5427 {
5428 int ret;
5429
5430 /*
5431 * There is a rare lock ordering dependency in cma_netdev_callback()
5432 * that only happens when bonding is enabled. Teach lockdep that rtnl
5433 * must never be nested under lock so it can find these without having
5434 * to test with bonding.
5435 */
5436 if (IS_ENABLED(CONFIG_LOCKDEP)) {
5437 rtnl_lock();
5438 mutex_lock(&lock);
5439 mutex_unlock(&lock);
5440 rtnl_unlock();
5441 }
5442
5443 cma_wq = alloc_ordered_workqueue("rdma_cm", WQ_MEM_RECLAIM);
5444 if (!cma_wq)
5445 return -ENOMEM;
5446
5447 ret = register_pernet_subsys(&cma_pernet_operations);
5448 if (ret)
5449 goto err_wq;
5450
5451 ib_sa_register_client(&sa_client);
5452 register_netdevice_notifier(&cma_nb);
5453 register_netevent_notifier(&cma_netevent_cb);
5454
5455 ret = ib_register_client(&cma_client);
5456 if (ret)
5457 goto err;
5458
5459 ret = cma_configfs_init();
5460 if (ret)
5461 goto err_ib;
5462
5463 return 0;
5464
5465 err_ib:
5466 ib_unregister_client(&cma_client);
5467 err:
5468 unregister_netevent_notifier(&cma_netevent_cb);
5469 unregister_netdevice_notifier(&cma_nb);
5470 ib_sa_unregister_client(&sa_client);
5471 unregister_pernet_subsys(&cma_pernet_operations);
5472 err_wq:
5473 destroy_workqueue(cma_wq);
5474 return ret;
5475 }
5476
5477 static void __exit cma_cleanup(void)
5478 {
5479 cma_configfs_exit();
5480 ib_unregister_client(&cma_client);
5481 unregister_netevent_notifier(&cma_netevent_cb);
5482 unregister_netdevice_notifier(&cma_nb);
5483 ib_sa_unregister_client(&sa_client);
5484 unregister_pernet_subsys(&cma_pernet_operations);
5485 destroy_workqueue(cma_wq);
5486 }
5487
5488 module_init(cma_init);
5489 module_exit(cma_cleanup);
Kernel DRM miscellaneous fixes and cross-tree changes