1 // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
2 /*
3 * Copyright (c) 2005 Voltaire Inc. All rights reserved.
4 * Copyright (c) 2002-2005, Network Appliance, Inc. All rights reserved.
5 * Copyright (c) 1999-2019, Mellanox Technologies, Inc. All rights reserved.
6 * Copyright (c) 2005-2006 Intel Corporation. All rights reserved.
7 */
8
9 #include <linux/completion.h>
10 #include <linux/in.h>
11 #include <linux/in6.h>
12 #include <linux/mutex.h>
13 #include <linux/random.h>
14 #include <linux/igmp.h>
15 #include <linux/xarray.h>
16 #include <linux/inetdevice.h>
17 #include <linux/slab.h>
18 #include <linux/module.h>
19 #include <net/route.h>
20
21 #include <net/net_namespace.h>
22 #include <net/netns/generic.h>
23 #include <net/tcp.h>
24 #include <net/ipv6.h>
25 #include <net/ip_fib.h>
26 #include <net/ip6_route.h>
27
28 #include <rdma/rdma_cm.h>
29 #include <rdma/rdma_cm_ib.h>
30 #include <rdma/rdma_netlink.h>
31 #include <rdma/ib.h>
32 #include <rdma/ib_cache.h>
33 #include <rdma/ib_cm.h>
34 #include <rdma/ib_sa.h>
35 #include <rdma/iw_cm.h>
36
37 #include "core_priv.h"
38 #include "cma_priv.h"
39 #include "cma_trace.h"
40
41 MODULE_AUTHOR("Sean Hefty");
42 MODULE_DESCRIPTION("Generic RDMA CM Agent");
43 MODULE_LICENSE("Dual BSD/GPL");
44
45 #define CMA_CM_RESPONSE_TIMEOUT 20
46 #define CMA_MAX_CM_RETRIES 15
47 #define CMA_CM_MRA_SETTING (IB_CM_MRA_FLAG_DELAY | 24)
48 #define CMA_IBOE_PACKET_LIFETIME 18
49 #define CMA_PREFERRED_ROCE_GID_TYPE IB_GID_TYPE_ROCE_UDP_ENCAP
50
51 static const char * const cma_events[] = {
52 [RDMA_CM_EVENT_ADDR_RESOLVED] = "address resolved",
53 [RDMA_CM_EVENT_ADDR_ERROR] = "address error",
54 [RDMA_CM_EVENT_ROUTE_RESOLVED] = "route resolved ",
55 [RDMA_CM_EVENT_ROUTE_ERROR] = "route error",
56 [RDMA_CM_EVENT_CONNECT_REQUEST] = "connect request",
57 [RDMA_CM_EVENT_CONNECT_RESPONSE] = "connect response",
58 [RDMA_CM_EVENT_CONNECT_ERROR] = "connect error",
59 [RDMA_CM_EVENT_UNREACHABLE] = "unreachable",
60 [RDMA_CM_EVENT_REJECTED] = "rejected",
61 [RDMA_CM_EVENT_ESTABLISHED] = "established",
62 [RDMA_CM_EVENT_DISCONNECTED] = "disconnected",
63 [RDMA_CM_EVENT_DEVICE_REMOVAL] = "device removal",
64 [RDMA_CM_EVENT_MULTICAST_JOIN] = "multicast join",
65 [RDMA_CM_EVENT_MULTICAST_ERROR] = "multicast error",
66 [RDMA_CM_EVENT_ADDR_CHANGE] = "address change",
67 [RDMA_CM_EVENT_TIMEWAIT_EXIT] = "timewait exit",
68 };
69
70 static void cma_set_mgid(struct rdma_id_private *id_priv, struct sockaddr *addr,
71 union ib_gid *mgid);
72
rdma_event_msg(enum rdma_cm_event_type event)73 const char *__attribute_const__ rdma_event_msg(enum rdma_cm_event_type event)
74 {
75 size_t index = event;
76
77 return (index < ARRAY_SIZE(cma_events) && cma_events[index]) ?
78 cma_events[index] : "unrecognized event";
79 }
80 EXPORT_SYMBOL(rdma_event_msg);
81
rdma_reject_msg(struct rdma_cm_id * id,int reason)82 const char *__attribute_const__ rdma_reject_msg(struct rdma_cm_id *id,
83 int reason)
84 {
85 if (rdma_ib_or_roce(id->device, id->port_num))
86 return ibcm_reject_msg(reason);
87
88 if (rdma_protocol_iwarp(id->device, id->port_num))
89 return iwcm_reject_msg(reason);
90
91 WARN_ON_ONCE(1);
92 return "unrecognized transport";
93 }
94 EXPORT_SYMBOL(rdma_reject_msg);
95
96 /**
97 * rdma_is_consumer_reject - return true if the consumer rejected the connect
98 * request.
99 * @id: Communication identifier that received the REJECT event.
100 * @reason: Value returned in the REJECT event status field.
101 */
rdma_is_consumer_reject(struct rdma_cm_id * id,int reason)102 static bool rdma_is_consumer_reject(struct rdma_cm_id *id, int reason)
103 {
104 if (rdma_ib_or_roce(id->device, id->port_num))
105 return reason == IB_CM_REJ_CONSUMER_DEFINED;
106
107 if (rdma_protocol_iwarp(id->device, id->port_num))
108 return reason == -ECONNREFUSED;
109
110 WARN_ON_ONCE(1);
111 return false;
112 }
113
rdma_consumer_reject_data(struct rdma_cm_id * id,struct rdma_cm_event * ev,u8 * data_len)114 const void *rdma_consumer_reject_data(struct rdma_cm_id *id,
115 struct rdma_cm_event *ev, u8 *data_len)
116 {
117 const void *p;
118
119 if (rdma_is_consumer_reject(id, ev->status)) {
120 *data_len = ev->param.conn.private_data_len;
121 p = ev->param.conn.private_data;
122 } else {
123 *data_len = 0;
124 p = NULL;
125 }
126 return p;
127 }
128 EXPORT_SYMBOL(rdma_consumer_reject_data);
129
130 /**
131 * rdma_iw_cm_id() - return the iw_cm_id pointer for this cm_id.
132 * @id: Communication Identifier
133 */
rdma_iw_cm_id(struct rdma_cm_id * id)134 struct iw_cm_id *rdma_iw_cm_id(struct rdma_cm_id *id)
135 {
136 struct rdma_id_private *id_priv;
137
138 id_priv = container_of(id, struct rdma_id_private, id);
139 if (id->device->node_type == RDMA_NODE_RNIC)
140 return id_priv->cm_id.iw;
141 return NULL;
142 }
143 EXPORT_SYMBOL(rdma_iw_cm_id);
144
145 /**
146 * rdma_res_to_id() - return the rdma_cm_id pointer for this restrack.
147 * @res: rdma resource tracking entry pointer
148 */
rdma_res_to_id(struct rdma_restrack_entry * res)149 struct rdma_cm_id *rdma_res_to_id(struct rdma_restrack_entry *res)
150 {
151 struct rdma_id_private *id_priv =
152 container_of(res, struct rdma_id_private, res);
153
154 return &id_priv->id;
155 }
156 EXPORT_SYMBOL(rdma_res_to_id);
157
158 static int cma_add_one(struct ib_device *device);
159 static void cma_remove_one(struct ib_device *device, void *client_data);
160
161 static struct ib_client cma_client = {
162 .name = "cma",
163 .add = cma_add_one,
164 .remove = cma_remove_one
165 };
166
167 static struct ib_sa_client sa_client;
168 static LIST_HEAD(dev_list);
169 static LIST_HEAD(listen_any_list);
170 static DEFINE_MUTEX(lock);
171 static struct workqueue_struct *cma_wq;
172 static unsigned int cma_pernet_id;
173
174 struct cma_pernet {
175 struct xarray tcp_ps;
176 struct xarray udp_ps;
177 struct xarray ipoib_ps;
178 struct xarray ib_ps;
179 };
180
cma_pernet(struct net * net)181 static struct cma_pernet *cma_pernet(struct net *net)
182 {
183 return net_generic(net, cma_pernet_id);
184 }
185
186 static
cma_pernet_xa(struct net * net,enum rdma_ucm_port_space ps)187 struct xarray *cma_pernet_xa(struct net *net, enum rdma_ucm_port_space ps)
188 {
189 struct cma_pernet *pernet = cma_pernet(net);
190
191 switch (ps) {
192 case RDMA_PS_TCP:
193 return &pernet->tcp_ps;
194 case RDMA_PS_UDP:
195 return &pernet->udp_ps;
196 case RDMA_PS_IPOIB:
197 return &pernet->ipoib_ps;
198 case RDMA_PS_IB:
199 return &pernet->ib_ps;
200 default:
201 return NULL;
202 }
203 }
204
205 struct cma_device {
206 struct list_head list;
207 struct ib_device *device;
208 struct completion comp;
209 refcount_t refcount;
210 struct list_head id_list;
211 enum ib_gid_type *default_gid_type;
212 u8 *default_roce_tos;
213 };
214
215 struct rdma_bind_list {
216 enum rdma_ucm_port_space ps;
217 struct hlist_head owners;
218 unsigned short port;
219 };
220
cma_ps_alloc(struct net * net,enum rdma_ucm_port_space ps,struct rdma_bind_list * bind_list,int snum)221 static int cma_ps_alloc(struct net *net, enum rdma_ucm_port_space ps,
222 struct rdma_bind_list *bind_list, int snum)
223 {
224 struct xarray *xa = cma_pernet_xa(net, ps);
225
226 return xa_insert(xa, snum, bind_list, GFP_KERNEL);
227 }
228
cma_ps_find(struct net * net,enum rdma_ucm_port_space ps,int snum)229 static struct rdma_bind_list *cma_ps_find(struct net *net,
230 enum rdma_ucm_port_space ps, int snum)
231 {
232 struct xarray *xa = cma_pernet_xa(net, ps);
233
234 return xa_load(xa, snum);
235 }
236
cma_ps_remove(struct net * net,enum rdma_ucm_port_space ps,int snum)237 static void cma_ps_remove(struct net *net, enum rdma_ucm_port_space ps,
238 int snum)
239 {
240 struct xarray *xa = cma_pernet_xa(net, ps);
241
242 xa_erase(xa, snum);
243 }
244
245 enum {
246 CMA_OPTION_AFONLY,
247 };
248
cma_dev_get(struct cma_device * cma_dev)249 void cma_dev_get(struct cma_device *cma_dev)
250 {
251 refcount_inc(&cma_dev->refcount);
252 }
253
cma_dev_put(struct cma_device * cma_dev)254 void cma_dev_put(struct cma_device *cma_dev)
255 {
256 if (refcount_dec_and_test(&cma_dev->refcount))
257 complete(&cma_dev->comp);
258 }
259
cma_enum_devices_by_ibdev(cma_device_filter filter,void * cookie)260 struct cma_device *cma_enum_devices_by_ibdev(cma_device_filter filter,
261 void *cookie)
262 {
263 struct cma_device *cma_dev;
264 struct cma_device *found_cma_dev = NULL;
265
266 mutex_lock(&lock);
267
268 list_for_each_entry(cma_dev, &dev_list, list)
269 if (filter(cma_dev->device, cookie)) {
270 found_cma_dev = cma_dev;
271 break;
272 }
273
274 if (found_cma_dev)
275 cma_dev_get(found_cma_dev);
276 mutex_unlock(&lock);
277 return found_cma_dev;
278 }
279
cma_get_default_gid_type(struct cma_device * cma_dev,u32 port)280 int cma_get_default_gid_type(struct cma_device *cma_dev,
281 u32 port)
282 {
283 if (!rdma_is_port_valid(cma_dev->device, port))
284 return -EINVAL;
285
286 return cma_dev->default_gid_type[port - rdma_start_port(cma_dev->device)];
287 }
288
cma_set_default_gid_type(struct cma_device * cma_dev,u32 port,enum ib_gid_type default_gid_type)289 int cma_set_default_gid_type(struct cma_device *cma_dev,
290 u32 port,
291 enum ib_gid_type default_gid_type)
292 {
293 unsigned long supported_gids;
294
295 if (!rdma_is_port_valid(cma_dev->device, port))
296 return -EINVAL;
297
298 if (default_gid_type == IB_GID_TYPE_IB &&
299 rdma_protocol_roce_eth_encap(cma_dev->device, port))
300 default_gid_type = IB_GID_TYPE_ROCE;
301
302 supported_gids = roce_gid_type_mask_support(cma_dev->device, port);
303
304 if (!(supported_gids & 1 << default_gid_type))
305 return -EINVAL;
306
307 cma_dev->default_gid_type[port - rdma_start_port(cma_dev->device)] =
308 default_gid_type;
309
310 return 0;
311 }
312
cma_get_default_roce_tos(struct cma_device * cma_dev,u32 port)313 int cma_get_default_roce_tos(struct cma_device *cma_dev, u32 port)
314 {
315 if (!rdma_is_port_valid(cma_dev->device, port))
316 return -EINVAL;
317
318 return cma_dev->default_roce_tos[port - rdma_start_port(cma_dev->device)];
319 }
320
cma_set_default_roce_tos(struct cma_device * cma_dev,u32 port,u8 default_roce_tos)321 int cma_set_default_roce_tos(struct cma_device *cma_dev, u32 port,
322 u8 default_roce_tos)
323 {
324 if (!rdma_is_port_valid(cma_dev->device, port))
325 return -EINVAL;
326
327 cma_dev->default_roce_tos[port - rdma_start_port(cma_dev->device)] =
328 default_roce_tos;
329
330 return 0;
331 }
cma_get_ib_dev(struct cma_device * cma_dev)332 struct ib_device *cma_get_ib_dev(struct cma_device *cma_dev)
333 {
334 return cma_dev->device;
335 }
336
337 /*
338 * Device removal can occur at anytime, so we need extra handling to
339 * serialize notifying the user of device removal with other callbacks.
340 * We do this by disabling removal notification while a callback is in process,
341 * and reporting it after the callback completes.
342 */
343
344 struct cma_multicast {
345 struct rdma_id_private *id_priv;
346 union {
347 struct ib_sa_multicast *sa_mc;
348 struct {
349 struct work_struct work;
350 struct rdma_cm_event event;
351 } iboe_join;
352 };
353 struct list_head list;
354 void *context;
355 struct sockaddr_storage addr;
356 u8 join_state;
357 };
358
359 struct cma_work {
360 struct work_struct work;
361 struct rdma_id_private *id;
362 enum rdma_cm_state old_state;
363 enum rdma_cm_state new_state;
364 struct rdma_cm_event event;
365 };
366
367 union cma_ip_addr {
368 struct in6_addr ip6;
369 struct {
370 __be32 pad[3];
371 __be32 addr;
372 } ip4;
373 };
374
375 struct cma_hdr {
376 u8 cma_version;
377 u8 ip_version; /* IP version: 7:4 */
378 __be16 port;
379 union cma_ip_addr src_addr;
380 union cma_ip_addr dst_addr;
381 };
382
383 #define CMA_VERSION 0x00
384
385 struct cma_req_info {
386 struct sockaddr_storage listen_addr_storage;
387 struct sockaddr_storage src_addr_storage;
388 struct ib_device *device;
389 union ib_gid local_gid;
390 __be64 service_id;
391 int port;
392 bool has_gid;
393 u16 pkey;
394 };
395
cma_comp_exch(struct rdma_id_private * id_priv,enum rdma_cm_state comp,enum rdma_cm_state exch)396 static int cma_comp_exch(struct rdma_id_private *id_priv,
397 enum rdma_cm_state comp, enum rdma_cm_state exch)
398 {
399 unsigned long flags;
400 int ret;
401
402 /*
403 * The FSM uses a funny double locking where state is protected by both
404 * the handler_mutex and the spinlock. State is not allowed to change
405 * to/from a handler_mutex protected value without also holding
406 * handler_mutex.
407 */
408 if (comp == RDMA_CM_CONNECT || exch == RDMA_CM_CONNECT)
409 lockdep_assert_held(&id_priv->handler_mutex);
410
411 spin_lock_irqsave(&id_priv->lock, flags);
412 if ((ret = (id_priv->state == comp)))
413 id_priv->state = exch;
414 spin_unlock_irqrestore(&id_priv->lock, flags);
415 return ret;
416 }
417
cma_get_ip_ver(const struct cma_hdr * hdr)418 static inline u8 cma_get_ip_ver(const struct cma_hdr *hdr)
419 {
420 return hdr->ip_version >> 4;
421 }
422
cma_set_ip_ver(struct cma_hdr * hdr,u8 ip_ver)423 static inline void cma_set_ip_ver(struct cma_hdr *hdr, u8 ip_ver)
424 {
425 hdr->ip_version = (ip_ver << 4) | (hdr->ip_version & 0xF);
426 }
427
cma_igmp_send(struct net_device * ndev,union ib_gid * mgid,bool join)428 static int cma_igmp_send(struct net_device *ndev, union ib_gid *mgid, bool join)
429 {
430 struct in_device *in_dev = NULL;
431
432 if (ndev) {
433 rtnl_lock();
434 in_dev = __in_dev_get_rtnl(ndev);
435 if (in_dev) {
436 if (join)
437 ip_mc_inc_group(in_dev,
438 *(__be32 *)(mgid->raw + 12));
439 else
440 ip_mc_dec_group(in_dev,
441 *(__be32 *)(mgid->raw + 12));
442 }
443 rtnl_unlock();
444 }
445 return (in_dev) ? 0 : -ENODEV;
446 }
447
_cma_attach_to_dev(struct rdma_id_private * id_priv,struct cma_device * cma_dev)448 static void _cma_attach_to_dev(struct rdma_id_private *id_priv,
449 struct cma_device *cma_dev)
450 {
451 cma_dev_get(cma_dev);
452 id_priv->cma_dev = cma_dev;
453 id_priv->id.device = cma_dev->device;
454 id_priv->id.route.addr.dev_addr.transport =
455 rdma_node_get_transport(cma_dev->device->node_type);
456 list_add_tail(&id_priv->list, &cma_dev->id_list);
457
458 trace_cm_id_attach(id_priv, cma_dev->device);
459 }
460
cma_attach_to_dev(struct rdma_id_private * id_priv,struct cma_device * cma_dev)461 static void cma_attach_to_dev(struct rdma_id_private *id_priv,
462 struct cma_device *cma_dev)
463 {
464 _cma_attach_to_dev(id_priv, cma_dev);
465 id_priv->gid_type =
466 cma_dev->default_gid_type[id_priv->id.port_num -
467 rdma_start_port(cma_dev->device)];
468 }
469
cma_release_dev(struct rdma_id_private * id_priv)470 static void cma_release_dev(struct rdma_id_private *id_priv)
471 {
472 mutex_lock(&lock);
473 list_del(&id_priv->list);
474 cma_dev_put(id_priv->cma_dev);
475 id_priv->cma_dev = NULL;
476 if (id_priv->id.route.addr.dev_addr.sgid_attr) {
477 rdma_put_gid_attr(id_priv->id.route.addr.dev_addr.sgid_attr);
478 id_priv->id.route.addr.dev_addr.sgid_attr = NULL;
479 }
480 mutex_unlock(&lock);
481 }
482
cma_src_addr(struct rdma_id_private * id_priv)483 static inline struct sockaddr *cma_src_addr(struct rdma_id_private *id_priv)
484 {
485 return (struct sockaddr *) &id_priv->id.route.addr.src_addr;
486 }
487
cma_dst_addr(struct rdma_id_private * id_priv)488 static inline struct sockaddr *cma_dst_addr(struct rdma_id_private *id_priv)
489 {
490 return (struct sockaddr *) &id_priv->id.route.addr.dst_addr;
491 }
492
cma_family(struct rdma_id_private * id_priv)493 static inline unsigned short cma_family(struct rdma_id_private *id_priv)
494 {
495 return id_priv->id.route.addr.src_addr.ss_family;
496 }
497
cma_set_qkey(struct rdma_id_private * id_priv,u32 qkey)498 static int cma_set_qkey(struct rdma_id_private *id_priv, u32 qkey)
499 {
500 struct ib_sa_mcmember_rec rec;
501 int ret = 0;
502
503 if (id_priv->qkey) {
504 if (qkey && id_priv->qkey != qkey)
505 return -EINVAL;
506 return 0;
507 }
508
509 if (qkey) {
510 id_priv->qkey = qkey;
511 return 0;
512 }
513
514 switch (id_priv->id.ps) {
515 case RDMA_PS_UDP:
516 case RDMA_PS_IB:
517 id_priv->qkey = RDMA_UDP_QKEY;
518 break;
519 case RDMA_PS_IPOIB:
520 ib_addr_get_mgid(&id_priv->id.route.addr.dev_addr, &rec.mgid);
521 ret = ib_sa_get_mcmember_rec(id_priv->id.device,
522 id_priv->id.port_num, &rec.mgid,
523 &rec);
524 if (!ret)
525 id_priv->qkey = be32_to_cpu(rec.qkey);
526 break;
527 default:
528 break;
529 }
530 return ret;
531 }
532
cma_translate_ib(struct sockaddr_ib * sib,struct rdma_dev_addr * dev_addr)533 static void cma_translate_ib(struct sockaddr_ib *sib, struct rdma_dev_addr *dev_addr)
534 {
535 dev_addr->dev_type = ARPHRD_INFINIBAND;
536 rdma_addr_set_sgid(dev_addr, (union ib_gid *) &sib->sib_addr);
537 ib_addr_set_pkey(dev_addr, ntohs(sib->sib_pkey));
538 }
539
cma_translate_addr(struct sockaddr * addr,struct rdma_dev_addr * dev_addr)540 static int cma_translate_addr(struct sockaddr *addr, struct rdma_dev_addr *dev_addr)
541 {
542 int ret;
543
544 if (addr->sa_family != AF_IB) {
545 ret = rdma_translate_ip(addr, dev_addr);
546 } else {
547 cma_translate_ib((struct sockaddr_ib *) addr, dev_addr);
548 ret = 0;
549 }
550
551 return ret;
552 }
553
554 static const struct ib_gid_attr *
cma_validate_port(struct ib_device * device,u32 port,enum ib_gid_type gid_type,union ib_gid * gid,struct rdma_id_private * id_priv)555 cma_validate_port(struct ib_device *device, u32 port,
556 enum ib_gid_type gid_type,
557 union ib_gid *gid,
558 struct rdma_id_private *id_priv)
559 {
560 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
561 int bound_if_index = dev_addr->bound_dev_if;
562 const struct ib_gid_attr *sgid_attr;
563 int dev_type = dev_addr->dev_type;
564 struct net_device *ndev = NULL;
565
566 if (!rdma_dev_access_netns(device, id_priv->id.route.addr.dev_addr.net))
567 return ERR_PTR(-ENODEV);
568
569 if ((dev_type == ARPHRD_INFINIBAND) && !rdma_protocol_ib(device, port))
570 return ERR_PTR(-ENODEV);
571
572 if ((dev_type != ARPHRD_INFINIBAND) && rdma_protocol_ib(device, port))
573 return ERR_PTR(-ENODEV);
574
575 if (dev_type == ARPHRD_ETHER && rdma_protocol_roce(device, port)) {
576 ndev = dev_get_by_index(dev_addr->net, bound_if_index);
577 if (!ndev)
578 return ERR_PTR(-ENODEV);
579 } else {
580 gid_type = IB_GID_TYPE_IB;
581 }
582
583 sgid_attr = rdma_find_gid_by_port(device, gid, gid_type, port, ndev);
584 if (ndev)
585 dev_put(ndev);
586 return sgid_attr;
587 }
588
cma_bind_sgid_attr(struct rdma_id_private * id_priv,const struct ib_gid_attr * sgid_attr)589 static void cma_bind_sgid_attr(struct rdma_id_private *id_priv,
590 const struct ib_gid_attr *sgid_attr)
591 {
592 WARN_ON(id_priv->id.route.addr.dev_addr.sgid_attr);
593 id_priv->id.route.addr.dev_addr.sgid_attr = sgid_attr;
594 }
595
596 /**
597 * cma_acquire_dev_by_src_ip - Acquire cma device, port, gid attribute
598 * based on source ip address.
599 * @id_priv: cm_id which should be bound to cma device
600 *
601 * cma_acquire_dev_by_src_ip() binds cm id to cma device, port and GID attribute
602 * based on source IP address. It returns 0 on success or error code otherwise.
603 * It is applicable to active and passive side cm_id.
604 */
cma_acquire_dev_by_src_ip(struct rdma_id_private * id_priv)605 static int cma_acquire_dev_by_src_ip(struct rdma_id_private *id_priv)
606 {
607 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
608 const struct ib_gid_attr *sgid_attr;
609 union ib_gid gid, iboe_gid, *gidp;
610 struct cma_device *cma_dev;
611 enum ib_gid_type gid_type;
612 int ret = -ENODEV;
613 u32 port;
614
615 if (dev_addr->dev_type != ARPHRD_INFINIBAND &&
616 id_priv->id.ps == RDMA_PS_IPOIB)
617 return -EINVAL;
618
619 rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
620 &iboe_gid);
621
622 memcpy(&gid, dev_addr->src_dev_addr +
623 rdma_addr_gid_offset(dev_addr), sizeof(gid));
624
625 mutex_lock(&lock);
626 list_for_each_entry(cma_dev, &dev_list, list) {
627 rdma_for_each_port (cma_dev->device, port) {
628 gidp = rdma_protocol_roce(cma_dev->device, port) ?
629 &iboe_gid : &gid;
630 gid_type = cma_dev->default_gid_type[port - 1];
631 sgid_attr = cma_validate_port(cma_dev->device, port,
632 gid_type, gidp, id_priv);
633 if (!IS_ERR(sgid_attr)) {
634 id_priv->id.port_num = port;
635 cma_bind_sgid_attr(id_priv, sgid_attr);
636 cma_attach_to_dev(id_priv, cma_dev);
637 ret = 0;
638 goto out;
639 }
640 }
641 }
642 out:
643 mutex_unlock(&lock);
644 return ret;
645 }
646
647 /**
648 * cma_ib_acquire_dev - Acquire cma device, port and SGID attribute
649 * @id_priv: cm id to bind to cma device
650 * @listen_id_priv: listener cm id to match against
651 * @req: Pointer to req structure containaining incoming
652 * request information
653 * cma_ib_acquire_dev() acquires cma device, port and SGID attribute when
654 * rdma device matches for listen_id and incoming request. It also verifies
655 * that a GID table entry is present for the source address.
656 * Returns 0 on success, or returns error code otherwise.
657 */
cma_ib_acquire_dev(struct rdma_id_private * id_priv,const struct rdma_id_private * listen_id_priv,struct cma_req_info * req)658 static int cma_ib_acquire_dev(struct rdma_id_private *id_priv,
659 const struct rdma_id_private *listen_id_priv,
660 struct cma_req_info *req)
661 {
662 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
663 const struct ib_gid_attr *sgid_attr;
664 enum ib_gid_type gid_type;
665 union ib_gid gid;
666
667 if (dev_addr->dev_type != ARPHRD_INFINIBAND &&
668 id_priv->id.ps == RDMA_PS_IPOIB)
669 return -EINVAL;
670
671 if (rdma_protocol_roce(req->device, req->port))
672 rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
673 &gid);
674 else
675 memcpy(&gid, dev_addr->src_dev_addr +
676 rdma_addr_gid_offset(dev_addr), sizeof(gid));
677
678 gid_type = listen_id_priv->cma_dev->default_gid_type[req->port - 1];
679 sgid_attr = cma_validate_port(req->device, req->port,
680 gid_type, &gid, id_priv);
681 if (IS_ERR(sgid_attr))
682 return PTR_ERR(sgid_attr);
683
684 id_priv->id.port_num = req->port;
685 cma_bind_sgid_attr(id_priv, sgid_attr);
686 /* Need to acquire lock to protect against reader
687 * of cma_dev->id_list such as cma_netdev_callback() and
688 * cma_process_remove().
689 */
690 mutex_lock(&lock);
691 cma_attach_to_dev(id_priv, listen_id_priv->cma_dev);
692 mutex_unlock(&lock);
693 rdma_restrack_add(&id_priv->res);
694 return 0;
695 }
696
cma_iw_acquire_dev(struct rdma_id_private * id_priv,const struct rdma_id_private * listen_id_priv)697 static int cma_iw_acquire_dev(struct rdma_id_private *id_priv,
698 const struct rdma_id_private *listen_id_priv)
699 {
700 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
701 const struct ib_gid_attr *sgid_attr;
702 struct cma_device *cma_dev;
703 enum ib_gid_type gid_type;
704 int ret = -ENODEV;
705 union ib_gid gid;
706 u32 port;
707
708 if (dev_addr->dev_type != ARPHRD_INFINIBAND &&
709 id_priv->id.ps == RDMA_PS_IPOIB)
710 return -EINVAL;
711
712 memcpy(&gid, dev_addr->src_dev_addr +
713 rdma_addr_gid_offset(dev_addr), sizeof(gid));
714
715 mutex_lock(&lock);
716
717 cma_dev = listen_id_priv->cma_dev;
718 port = listen_id_priv->id.port_num;
719 gid_type = listen_id_priv->gid_type;
720 sgid_attr = cma_validate_port(cma_dev->device, port,
721 gid_type, &gid, id_priv);
722 if (!IS_ERR(sgid_attr)) {
723 id_priv->id.port_num = port;
724 cma_bind_sgid_attr(id_priv, sgid_attr);
725 ret = 0;
726 goto out;
727 }
728
729 list_for_each_entry(cma_dev, &dev_list, list) {
730 rdma_for_each_port (cma_dev->device, port) {
731 if (listen_id_priv->cma_dev == cma_dev &&
732 listen_id_priv->id.port_num == port)
733 continue;
734
735 gid_type = cma_dev->default_gid_type[port - 1];
736 sgid_attr = cma_validate_port(cma_dev->device, port,
737 gid_type, &gid, id_priv);
738 if (!IS_ERR(sgid_attr)) {
739 id_priv->id.port_num = port;
740 cma_bind_sgid_attr(id_priv, sgid_attr);
741 ret = 0;
742 goto out;
743 }
744 }
745 }
746
747 out:
748 if (!ret) {
749 cma_attach_to_dev(id_priv, cma_dev);
750 rdma_restrack_add(&id_priv->res);
751 }
752
753 mutex_unlock(&lock);
754 return ret;
755 }
756
757 /*
758 * Select the source IB device and address to reach the destination IB address.
759 */
cma_resolve_ib_dev(struct rdma_id_private * id_priv)760 static int cma_resolve_ib_dev(struct rdma_id_private *id_priv)
761 {
762 struct cma_device *cma_dev, *cur_dev;
763 struct sockaddr_ib *addr;
764 union ib_gid gid, sgid, *dgid;
765 unsigned int p;
766 u16 pkey, index;
767 enum ib_port_state port_state;
768 int i;
769
770 cma_dev = NULL;
771 addr = (struct sockaddr_ib *) cma_dst_addr(id_priv);
772 dgid = (union ib_gid *) &addr->sib_addr;
773 pkey = ntohs(addr->sib_pkey);
774
775 mutex_lock(&lock);
776 list_for_each_entry(cur_dev, &dev_list, list) {
777 rdma_for_each_port (cur_dev->device, p) {
778 if (!rdma_cap_af_ib(cur_dev->device, p))
779 continue;
780
781 if (ib_find_cached_pkey(cur_dev->device, p, pkey, &index))
782 continue;
783
784 if (ib_get_cached_port_state(cur_dev->device, p, &port_state))
785 continue;
786 for (i = 0; !rdma_query_gid(cur_dev->device,
787 p, i, &gid);
788 i++) {
789 if (!memcmp(&gid, dgid, sizeof(gid))) {
790 cma_dev = cur_dev;
791 sgid = gid;
792 id_priv->id.port_num = p;
793 goto found;
794 }
795
796 if (!cma_dev && (gid.global.subnet_prefix ==
797 dgid->global.subnet_prefix) &&
798 port_state == IB_PORT_ACTIVE) {
799 cma_dev = cur_dev;
800 sgid = gid;
801 id_priv->id.port_num = p;
802 goto found;
803 }
804 }
805 }
806 }
807 mutex_unlock(&lock);
808 return -ENODEV;
809
810 found:
811 cma_attach_to_dev(id_priv, cma_dev);
812 rdma_restrack_add(&id_priv->res);
813 mutex_unlock(&lock);
814 addr = (struct sockaddr_ib *)cma_src_addr(id_priv);
815 memcpy(&addr->sib_addr, &sgid, sizeof(sgid));
816 cma_translate_ib(addr, &id_priv->id.route.addr.dev_addr);
817 return 0;
818 }
819
cma_id_get(struct rdma_id_private * id_priv)820 static void cma_id_get(struct rdma_id_private *id_priv)
821 {
822 refcount_inc(&id_priv->refcount);
823 }
824
cma_id_put(struct rdma_id_private * id_priv)825 static void cma_id_put(struct rdma_id_private *id_priv)
826 {
827 if (refcount_dec_and_test(&id_priv->refcount))
828 complete(&id_priv->comp);
829 }
830
831 static struct rdma_id_private *
__rdma_create_id(struct net * net,rdma_cm_event_handler event_handler,void * context,enum rdma_ucm_port_space ps,enum ib_qp_type qp_type,const struct rdma_id_private * parent)832 __rdma_create_id(struct net *net, rdma_cm_event_handler event_handler,
833 void *context, enum rdma_ucm_port_space ps,
834 enum ib_qp_type qp_type, const struct rdma_id_private *parent)
835 {
836 struct rdma_id_private *id_priv;
837
838 id_priv = kzalloc(sizeof *id_priv, GFP_KERNEL);
839 if (!id_priv)
840 return ERR_PTR(-ENOMEM);
841
842 id_priv->state = RDMA_CM_IDLE;
843 id_priv->id.context = context;
844 id_priv->id.event_handler = event_handler;
845 id_priv->id.ps = ps;
846 id_priv->id.qp_type = qp_type;
847 id_priv->tos_set = false;
848 id_priv->timeout_set = false;
849 id_priv->min_rnr_timer_set = false;
850 id_priv->gid_type = IB_GID_TYPE_IB;
851 spin_lock_init(&id_priv->lock);
852 mutex_init(&id_priv->qp_mutex);
853 init_completion(&id_priv->comp);
854 refcount_set(&id_priv->refcount, 1);
855 mutex_init(&id_priv->handler_mutex);
856 INIT_LIST_HEAD(&id_priv->listen_list);
857 INIT_LIST_HEAD(&id_priv->mc_list);
858 get_random_bytes(&id_priv->seq_num, sizeof id_priv->seq_num);
859 id_priv->id.route.addr.dev_addr.net = get_net(net);
860 id_priv->seq_num &= 0x00ffffff;
861
862 rdma_restrack_new(&id_priv->res, RDMA_RESTRACK_CM_ID);
863 if (parent)
864 rdma_restrack_parent_name(&id_priv->res, &parent->res);
865
866 return id_priv;
867 }
868
869 struct rdma_cm_id *
__rdma_create_kernel_id(struct net * net,rdma_cm_event_handler event_handler,void * context,enum rdma_ucm_port_space ps,enum ib_qp_type qp_type,const char * caller)870 __rdma_create_kernel_id(struct net *net, rdma_cm_event_handler event_handler,
871 void *context, enum rdma_ucm_port_space ps,
872 enum ib_qp_type qp_type, const char *caller)
873 {
874 struct rdma_id_private *ret;
875
876 ret = __rdma_create_id(net, event_handler, context, ps, qp_type, NULL);
877 if (IS_ERR(ret))
878 return ERR_CAST(ret);
879
880 rdma_restrack_set_name(&ret->res, caller);
881 return &ret->id;
882 }
883 EXPORT_SYMBOL(__rdma_create_kernel_id);
884
rdma_create_user_id(rdma_cm_event_handler event_handler,void * context,enum rdma_ucm_port_space ps,enum ib_qp_type qp_type)885 struct rdma_cm_id *rdma_create_user_id(rdma_cm_event_handler event_handler,
886 void *context,
887 enum rdma_ucm_port_space ps,
888 enum ib_qp_type qp_type)
889 {
890 struct rdma_id_private *ret;
891
892 ret = __rdma_create_id(current->nsproxy->net_ns, event_handler, context,
893 ps, qp_type, NULL);
894 if (IS_ERR(ret))
895 return ERR_CAST(ret);
896
897 rdma_restrack_set_name(&ret->res, NULL);
898 return &ret->id;
899 }
900 EXPORT_SYMBOL(rdma_create_user_id);
901
cma_init_ud_qp(struct rdma_id_private * id_priv,struct ib_qp * qp)902 static int cma_init_ud_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
903 {
904 struct ib_qp_attr qp_attr;
905 int qp_attr_mask, ret;
906
907 qp_attr.qp_state = IB_QPS_INIT;
908 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
909 if (ret)
910 return ret;
911
912 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
913 if (ret)
914 return ret;
915
916 qp_attr.qp_state = IB_QPS_RTR;
917 ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE);
918 if (ret)
919 return ret;
920
921 qp_attr.qp_state = IB_QPS_RTS;
922 qp_attr.sq_psn = 0;
923 ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE | IB_QP_SQ_PSN);
924
925 return ret;
926 }
927
cma_init_conn_qp(struct rdma_id_private * id_priv,struct ib_qp * qp)928 static int cma_init_conn_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
929 {
930 struct ib_qp_attr qp_attr;
931 int qp_attr_mask, ret;
932
933 qp_attr.qp_state = IB_QPS_INIT;
934 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
935 if (ret)
936 return ret;
937
938 return ib_modify_qp(qp, &qp_attr, qp_attr_mask);
939 }
940
rdma_create_qp(struct rdma_cm_id * id,struct ib_pd * pd,struct ib_qp_init_attr * qp_init_attr)941 int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd,
942 struct ib_qp_init_attr *qp_init_attr)
943 {
944 struct rdma_id_private *id_priv;
945 struct ib_qp *qp;
946 int ret;
947
948 id_priv = container_of(id, struct rdma_id_private, id);
949 if (id->device != pd->device) {
950 ret = -EINVAL;
951 goto out_err;
952 }
953
954 qp_init_attr->port_num = id->port_num;
955 qp = ib_create_qp(pd, qp_init_attr);
956 if (IS_ERR(qp)) {
957 ret = PTR_ERR(qp);
958 goto out_err;
959 }
960
961 if (id->qp_type == IB_QPT_UD)
962 ret = cma_init_ud_qp(id_priv, qp);
963 else
964 ret = cma_init_conn_qp(id_priv, qp);
965 if (ret)
966 goto out_destroy;
967
968 id->qp = qp;
969 id_priv->qp_num = qp->qp_num;
970 id_priv->srq = (qp->srq != NULL);
971 trace_cm_qp_create(id_priv, pd, qp_init_attr, 0);
972 return 0;
973 out_destroy:
974 ib_destroy_qp(qp);
975 out_err:
976 trace_cm_qp_create(id_priv, pd, qp_init_attr, ret);
977 return ret;
978 }
979 EXPORT_SYMBOL(rdma_create_qp);
980
rdma_destroy_qp(struct rdma_cm_id * id)981 void rdma_destroy_qp(struct rdma_cm_id *id)
982 {
983 struct rdma_id_private *id_priv;
984
985 id_priv = container_of(id, struct rdma_id_private, id);
986 trace_cm_qp_destroy(id_priv);
987 mutex_lock(&id_priv->qp_mutex);
988 ib_destroy_qp(id_priv->id.qp);
989 id_priv->id.qp = NULL;
990 mutex_unlock(&id_priv->qp_mutex);
991 }
992 EXPORT_SYMBOL(rdma_destroy_qp);
993
cma_modify_qp_rtr(struct rdma_id_private * id_priv,struct rdma_conn_param * conn_param)994 static int cma_modify_qp_rtr(struct rdma_id_private *id_priv,
995 struct rdma_conn_param *conn_param)
996 {
997 struct ib_qp_attr qp_attr;
998 int qp_attr_mask, ret;
999
1000 mutex_lock(&id_priv->qp_mutex);
1001 if (!id_priv->id.qp) {
1002 ret = 0;
1003 goto out;
1004 }
1005
1006 /* Need to update QP attributes from default values. */
1007 qp_attr.qp_state = IB_QPS_INIT;
1008 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
1009 if (ret)
1010 goto out;
1011
1012 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
1013 if (ret)
1014 goto out;
1015
1016 qp_attr.qp_state = IB_QPS_RTR;
1017 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
1018 if (ret)
1019 goto out;
1020
1021 BUG_ON(id_priv->cma_dev->device != id_priv->id.device);
1022
1023 if (conn_param)
1024 qp_attr.max_dest_rd_atomic = conn_param->responder_resources;
1025 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
1026 out:
1027 mutex_unlock(&id_priv->qp_mutex);
1028 return ret;
1029 }
1030
cma_modify_qp_rts(struct rdma_id_private * id_priv,struct rdma_conn_param * conn_param)1031 static int cma_modify_qp_rts(struct rdma_id_private *id_priv,
1032 struct rdma_conn_param *conn_param)
1033 {
1034 struct ib_qp_attr qp_attr;
1035 int qp_attr_mask, ret;
1036
1037 mutex_lock(&id_priv->qp_mutex);
1038 if (!id_priv->id.qp) {
1039 ret = 0;
1040 goto out;
1041 }
1042
1043 qp_attr.qp_state = IB_QPS_RTS;
1044 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
1045 if (ret)
1046 goto out;
1047
1048 if (conn_param)
1049 qp_attr.max_rd_atomic = conn_param->initiator_depth;
1050 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
1051 out:
1052 mutex_unlock(&id_priv->qp_mutex);
1053 return ret;
1054 }
1055
cma_modify_qp_err(struct rdma_id_private * id_priv)1056 static int cma_modify_qp_err(struct rdma_id_private *id_priv)
1057 {
1058 struct ib_qp_attr qp_attr;
1059 int ret;
1060
1061 mutex_lock(&id_priv->qp_mutex);
1062 if (!id_priv->id.qp) {
1063 ret = 0;
1064 goto out;
1065 }
1066
1067 qp_attr.qp_state = IB_QPS_ERR;
1068 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, IB_QP_STATE);
1069 out:
1070 mutex_unlock(&id_priv->qp_mutex);
1071 return ret;
1072 }
1073
cma_ib_init_qp_attr(struct rdma_id_private * id_priv,struct ib_qp_attr * qp_attr,int * qp_attr_mask)1074 static int cma_ib_init_qp_attr(struct rdma_id_private *id_priv,
1075 struct ib_qp_attr *qp_attr, int *qp_attr_mask)
1076 {
1077 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
1078 int ret;
1079 u16 pkey;
1080
1081 if (rdma_cap_eth_ah(id_priv->id.device, id_priv->id.port_num))
1082 pkey = 0xffff;
1083 else
1084 pkey = ib_addr_get_pkey(dev_addr);
1085
1086 ret = ib_find_cached_pkey(id_priv->id.device, id_priv->id.port_num,
1087 pkey, &qp_attr->pkey_index);
1088 if (ret)
1089 return ret;
1090
1091 qp_attr->port_num = id_priv->id.port_num;
1092 *qp_attr_mask = IB_QP_STATE | IB_QP_PKEY_INDEX | IB_QP_PORT;
1093
1094 if (id_priv->id.qp_type == IB_QPT_UD) {
1095 ret = cma_set_qkey(id_priv, 0);
1096 if (ret)
1097 return ret;
1098
1099 qp_attr->qkey = id_priv->qkey;
1100 *qp_attr_mask |= IB_QP_QKEY;
1101 } else {
1102 qp_attr->qp_access_flags = 0;
1103 *qp_attr_mask |= IB_QP_ACCESS_FLAGS;
1104 }
1105 return 0;
1106 }
1107
rdma_init_qp_attr(struct rdma_cm_id * id,struct ib_qp_attr * qp_attr,int * qp_attr_mask)1108 int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
1109 int *qp_attr_mask)
1110 {
1111 struct rdma_id_private *id_priv;
1112 int ret = 0;
1113
1114 id_priv = container_of(id, struct rdma_id_private, id);
1115 if (rdma_cap_ib_cm(id->device, id->port_num)) {
1116 if (!id_priv->cm_id.ib || (id_priv->id.qp_type == IB_QPT_UD))
1117 ret = cma_ib_init_qp_attr(id_priv, qp_attr, qp_attr_mask);
1118 else
1119 ret = ib_cm_init_qp_attr(id_priv->cm_id.ib, qp_attr,
1120 qp_attr_mask);
1121
1122 if (qp_attr->qp_state == IB_QPS_RTR)
1123 qp_attr->rq_psn = id_priv->seq_num;
1124 } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
1125 if (!id_priv->cm_id.iw) {
1126 qp_attr->qp_access_flags = 0;
1127 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS;
1128 } else
1129 ret = iw_cm_init_qp_attr(id_priv->cm_id.iw, qp_attr,
1130 qp_attr_mask);
1131 qp_attr->port_num = id_priv->id.port_num;
1132 *qp_attr_mask |= IB_QP_PORT;
1133 } else {
1134 ret = -ENOSYS;
1135 }
1136
1137 if ((*qp_attr_mask & IB_QP_TIMEOUT) && id_priv->timeout_set)
1138 qp_attr->timeout = id_priv->timeout;
1139
1140 if ((*qp_attr_mask & IB_QP_MIN_RNR_TIMER) && id_priv->min_rnr_timer_set)
1141 qp_attr->min_rnr_timer = id_priv->min_rnr_timer;
1142
1143 return ret;
1144 }
1145 EXPORT_SYMBOL(rdma_init_qp_attr);
1146
cma_zero_addr(const struct sockaddr * addr)1147 static inline bool cma_zero_addr(const struct sockaddr *addr)
1148 {
1149 switch (addr->sa_family) {
1150 case AF_INET:
1151 return ipv4_is_zeronet(((struct sockaddr_in *)addr)->sin_addr.s_addr);
1152 case AF_INET6:
1153 return ipv6_addr_any(&((struct sockaddr_in6 *)addr)->sin6_addr);
1154 case AF_IB:
1155 return ib_addr_any(&((struct sockaddr_ib *)addr)->sib_addr);
1156 default:
1157 return false;
1158 }
1159 }
1160
cma_loopback_addr(const struct sockaddr * addr)1161 static inline bool cma_loopback_addr(const struct sockaddr *addr)
1162 {
1163 switch (addr->sa_family) {
1164 case AF_INET:
1165 return ipv4_is_loopback(
1166 ((struct sockaddr_in *)addr)->sin_addr.s_addr);
1167 case AF_INET6:
1168 return ipv6_addr_loopback(
1169 &((struct sockaddr_in6 *)addr)->sin6_addr);
1170 case AF_IB:
1171 return ib_addr_loopback(
1172 &((struct sockaddr_ib *)addr)->sib_addr);
1173 default:
1174 return false;
1175 }
1176 }
1177
cma_any_addr(const struct sockaddr * addr)1178 static inline bool cma_any_addr(const struct sockaddr *addr)
1179 {
1180 return cma_zero_addr(addr) || cma_loopback_addr(addr);
1181 }
1182
cma_addr_cmp(const struct sockaddr * src,const struct sockaddr * dst)1183 static int cma_addr_cmp(const struct sockaddr *src, const struct sockaddr *dst)
1184 {
1185 if (src->sa_family != dst->sa_family)
1186 return -1;
1187
1188 switch (src->sa_family) {
1189 case AF_INET:
1190 return ((struct sockaddr_in *)src)->sin_addr.s_addr !=
1191 ((struct sockaddr_in *)dst)->sin_addr.s_addr;
1192 case AF_INET6: {
1193 struct sockaddr_in6 *src_addr6 = (struct sockaddr_in6 *)src;
1194 struct sockaddr_in6 *dst_addr6 = (struct sockaddr_in6 *)dst;
1195 bool link_local;
1196
1197 if (ipv6_addr_cmp(&src_addr6->sin6_addr,
1198 &dst_addr6->sin6_addr))
1199 return 1;
1200 link_local = ipv6_addr_type(&dst_addr6->sin6_addr) &
1201 IPV6_ADDR_LINKLOCAL;
1202 /* Link local must match their scope_ids */
1203 return link_local ? (src_addr6->sin6_scope_id !=
1204 dst_addr6->sin6_scope_id) :
1205 0;
1206 }
1207
1208 default:
1209 return ib_addr_cmp(&((struct sockaddr_ib *) src)->sib_addr,
1210 &((struct sockaddr_ib *) dst)->sib_addr);
1211 }
1212 }
1213
cma_port(const struct sockaddr * addr)1214 static __be16 cma_port(const struct sockaddr *addr)
1215 {
1216 struct sockaddr_ib *sib;
1217
1218 switch (addr->sa_family) {
1219 case AF_INET:
1220 return ((struct sockaddr_in *) addr)->sin_port;
1221 case AF_INET6:
1222 return ((struct sockaddr_in6 *) addr)->sin6_port;
1223 case AF_IB:
1224 sib = (struct sockaddr_ib *) addr;
1225 return htons((u16) (be64_to_cpu(sib->sib_sid) &
1226 be64_to_cpu(sib->sib_sid_mask)));
1227 default:
1228 return 0;
1229 }
1230 }
1231
cma_any_port(const struct sockaddr * addr)1232 static inline int cma_any_port(const struct sockaddr *addr)
1233 {
1234 return !cma_port(addr);
1235 }
1236
cma_save_ib_info(struct sockaddr * src_addr,struct sockaddr * dst_addr,const struct rdma_cm_id * listen_id,const struct sa_path_rec * path)1237 static void cma_save_ib_info(struct sockaddr *src_addr,
1238 struct sockaddr *dst_addr,
1239 const struct rdma_cm_id *listen_id,
1240 const struct sa_path_rec *path)
1241 {
1242 struct sockaddr_ib *listen_ib, *ib;
1243
1244 listen_ib = (struct sockaddr_ib *) &listen_id->route.addr.src_addr;
1245 if (src_addr) {
1246 ib = (struct sockaddr_ib *)src_addr;
1247 ib->sib_family = AF_IB;
1248 if (path) {
1249 ib->sib_pkey = path->pkey;
1250 ib->sib_flowinfo = path->flow_label;
1251 memcpy(&ib->sib_addr, &path->sgid, 16);
1252 ib->sib_sid = path->service_id;
1253 ib->sib_scope_id = 0;
1254 } else {
1255 ib->sib_pkey = listen_ib->sib_pkey;
1256 ib->sib_flowinfo = listen_ib->sib_flowinfo;
1257 ib->sib_addr = listen_ib->sib_addr;
1258 ib->sib_sid = listen_ib->sib_sid;
1259 ib->sib_scope_id = listen_ib->sib_scope_id;
1260 }
1261 ib->sib_sid_mask = cpu_to_be64(0xffffffffffffffffULL);
1262 }
1263 if (dst_addr) {
1264 ib = (struct sockaddr_ib *)dst_addr;
1265 ib->sib_family = AF_IB;
1266 if (path) {
1267 ib->sib_pkey = path->pkey;
1268 ib->sib_flowinfo = path->flow_label;
1269 memcpy(&ib->sib_addr, &path->dgid, 16);
1270 }
1271 }
1272 }
1273
cma_save_ip4_info(struct sockaddr_in * src_addr,struct sockaddr_in * dst_addr,struct cma_hdr * hdr,__be16 local_port)1274 static void cma_save_ip4_info(struct sockaddr_in *src_addr,
1275 struct sockaddr_in *dst_addr,
1276 struct cma_hdr *hdr,
1277 __be16 local_port)
1278 {
1279 if (src_addr) {
1280 *src_addr = (struct sockaddr_in) {
1281 .sin_family = AF_INET,
1282 .sin_addr.s_addr = hdr->dst_addr.ip4.addr,
1283 .sin_port = local_port,
1284 };
1285 }
1286
1287 if (dst_addr) {
1288 *dst_addr = (struct sockaddr_in) {
1289 .sin_family = AF_INET,
1290 .sin_addr.s_addr = hdr->src_addr.ip4.addr,
1291 .sin_port = hdr->port,
1292 };
1293 }
1294 }
1295
cma_save_ip6_info(struct sockaddr_in6 * src_addr,struct sockaddr_in6 * dst_addr,struct cma_hdr * hdr,__be16 local_port)1296 static void cma_save_ip6_info(struct sockaddr_in6 *src_addr,
1297 struct sockaddr_in6 *dst_addr,
1298 struct cma_hdr *hdr,
1299 __be16 local_port)
1300 {
1301 if (src_addr) {
1302 *src_addr = (struct sockaddr_in6) {
1303 .sin6_family = AF_INET6,
1304 .sin6_addr = hdr->dst_addr.ip6,
1305 .sin6_port = local_port,
1306 };
1307 }
1308
1309 if (dst_addr) {
1310 *dst_addr = (struct sockaddr_in6) {
1311 .sin6_family = AF_INET6,
1312 .sin6_addr = hdr->src_addr.ip6,
1313 .sin6_port = hdr->port,
1314 };
1315 }
1316 }
1317
cma_port_from_service_id(__be64 service_id)1318 static u16 cma_port_from_service_id(__be64 service_id)
1319 {
1320 return (u16)be64_to_cpu(service_id);
1321 }
1322
cma_save_ip_info(struct sockaddr * src_addr,struct sockaddr * dst_addr,const struct ib_cm_event * ib_event,__be64 service_id)1323 static int cma_save_ip_info(struct sockaddr *src_addr,
1324 struct sockaddr *dst_addr,
1325 const struct ib_cm_event *ib_event,
1326 __be64 service_id)
1327 {
1328 struct cma_hdr *hdr;
1329 __be16 port;
1330
1331 hdr = ib_event->private_data;
1332 if (hdr->cma_version != CMA_VERSION)
1333 return -EINVAL;
1334
1335 port = htons(cma_port_from_service_id(service_id));
1336
1337 switch (cma_get_ip_ver(hdr)) {
1338 case 4:
1339 cma_save_ip4_info((struct sockaddr_in *)src_addr,
1340 (struct sockaddr_in *)dst_addr, hdr, port);
1341 break;
1342 case 6:
1343 cma_save_ip6_info((struct sockaddr_in6 *)src_addr,
1344 (struct sockaddr_in6 *)dst_addr, hdr, port);
1345 break;
1346 default:
1347 return -EAFNOSUPPORT;
1348 }
1349
1350 return 0;
1351 }
1352
cma_save_net_info(struct sockaddr * src_addr,struct sockaddr * dst_addr,const struct rdma_cm_id * listen_id,const struct ib_cm_event * ib_event,sa_family_t sa_family,__be64 service_id)1353 static int cma_save_net_info(struct sockaddr *src_addr,
1354 struct sockaddr *dst_addr,
1355 const struct rdma_cm_id *listen_id,
1356 const struct ib_cm_event *ib_event,
1357 sa_family_t sa_family, __be64 service_id)
1358 {
1359 if (sa_family == AF_IB) {
1360 if (ib_event->event == IB_CM_REQ_RECEIVED)
1361 cma_save_ib_info(src_addr, dst_addr, listen_id,
1362 ib_event->param.req_rcvd.primary_path);
1363 else if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED)
1364 cma_save_ib_info(src_addr, dst_addr, listen_id, NULL);
1365 return 0;
1366 }
1367
1368 return cma_save_ip_info(src_addr, dst_addr, ib_event, service_id);
1369 }
1370
cma_save_req_info(const struct ib_cm_event * ib_event,struct cma_req_info * req)1371 static int cma_save_req_info(const struct ib_cm_event *ib_event,
1372 struct cma_req_info *req)
1373 {
1374 const struct ib_cm_req_event_param *req_param =
1375 &ib_event->param.req_rcvd;
1376 const struct ib_cm_sidr_req_event_param *sidr_param =
1377 &ib_event->param.sidr_req_rcvd;
1378
1379 switch (ib_event->event) {
1380 case IB_CM_REQ_RECEIVED:
1381 req->device = req_param->listen_id->device;
1382 req->port = req_param->port;
1383 memcpy(&req->local_gid, &req_param->primary_path->sgid,
1384 sizeof(req->local_gid));
1385 req->has_gid = true;
1386 req->service_id = req_param->primary_path->service_id;
1387 req->pkey = be16_to_cpu(req_param->primary_path->pkey);
1388 if (req->pkey != req_param->bth_pkey)
1389 pr_warn_ratelimited("RDMA CMA: got different BTH P_Key (0x%x) and primary path P_Key (0x%x)\n"
1390 "RDMA CMA: in the future this may cause the request to be dropped\n",
1391 req_param->bth_pkey, req->pkey);
1392 break;
1393 case IB_CM_SIDR_REQ_RECEIVED:
1394 req->device = sidr_param->listen_id->device;
1395 req->port = sidr_param->port;
1396 req->has_gid = false;
1397 req->service_id = sidr_param->service_id;
1398 req->pkey = sidr_param->pkey;
1399 if (req->pkey != sidr_param->bth_pkey)
1400 pr_warn_ratelimited("RDMA CMA: got different BTH P_Key (0x%x) and SIDR request payload P_Key (0x%x)\n"
1401 "RDMA CMA: in the future this may cause the request to be dropped\n",
1402 sidr_param->bth_pkey, req->pkey);
1403 break;
1404 default:
1405 return -EINVAL;
1406 }
1407
1408 return 0;
1409 }
1410
validate_ipv4_net_dev(struct net_device * net_dev,const struct sockaddr_in * dst_addr,const struct sockaddr_in * src_addr)1411 static bool validate_ipv4_net_dev(struct net_device *net_dev,
1412 const struct sockaddr_in *dst_addr,
1413 const struct sockaddr_in *src_addr)
1414 {
1415 __be32 daddr = dst_addr->sin_addr.s_addr,
1416 saddr = src_addr->sin_addr.s_addr;
1417 struct fib_result res;
1418 struct flowi4 fl4;
1419 int err;
1420 bool ret;
1421
1422 if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) ||
1423 ipv4_is_lbcast(daddr) || ipv4_is_zeronet(saddr) ||
1424 ipv4_is_zeronet(daddr) || ipv4_is_loopback(daddr) ||
1425 ipv4_is_loopback(saddr))
1426 return false;
1427
1428 memset(&fl4, 0, sizeof(fl4));
1429 fl4.flowi4_iif = net_dev->ifindex;
1430 fl4.daddr = daddr;
1431 fl4.saddr = saddr;
1432
1433 rcu_read_lock();
1434 err = fib_lookup(dev_net(net_dev), &fl4, &res, 0);
1435 ret = err == 0 && FIB_RES_DEV(res) == net_dev;
1436 rcu_read_unlock();
1437
1438 return ret;
1439 }
1440
validate_ipv6_net_dev(struct net_device * net_dev,const struct sockaddr_in6 * dst_addr,const struct sockaddr_in6 * src_addr)1441 static bool validate_ipv6_net_dev(struct net_device *net_dev,
1442 const struct sockaddr_in6 *dst_addr,
1443 const struct sockaddr_in6 *src_addr)
1444 {
1445 #if IS_ENABLED(CONFIG_IPV6)
1446 const int strict = ipv6_addr_type(&dst_addr->sin6_addr) &
1447 IPV6_ADDR_LINKLOCAL;
1448 struct rt6_info *rt = rt6_lookup(dev_net(net_dev), &dst_addr->sin6_addr,
1449 &src_addr->sin6_addr, net_dev->ifindex,
1450 NULL, strict);
1451 bool ret;
1452
1453 if (!rt)
1454 return false;
1455
1456 ret = rt->rt6i_idev->dev == net_dev;
1457 ip6_rt_put(rt);
1458
1459 return ret;
1460 #else
1461 return false;
1462 #endif
1463 }
1464
validate_net_dev(struct net_device * net_dev,const struct sockaddr * daddr,const struct sockaddr * saddr)1465 static bool validate_net_dev(struct net_device *net_dev,
1466 const struct sockaddr *daddr,
1467 const struct sockaddr *saddr)
1468 {
1469 const struct sockaddr_in *daddr4 = (const struct sockaddr_in *)daddr;
1470 const struct sockaddr_in *saddr4 = (const struct sockaddr_in *)saddr;
1471 const struct sockaddr_in6 *daddr6 = (const struct sockaddr_in6 *)daddr;
1472 const struct sockaddr_in6 *saddr6 = (const struct sockaddr_in6 *)saddr;
1473
1474 switch (daddr->sa_family) {
1475 case AF_INET:
1476 return saddr->sa_family == AF_INET &&
1477 validate_ipv4_net_dev(net_dev, daddr4, saddr4);
1478
1479 case AF_INET6:
1480 return saddr->sa_family == AF_INET6 &&
1481 validate_ipv6_net_dev(net_dev, daddr6, saddr6);
1482
1483 default:
1484 return false;
1485 }
1486 }
1487
1488 static struct net_device *
roce_get_net_dev_by_cm_event(const struct ib_cm_event * ib_event)1489 roce_get_net_dev_by_cm_event(const struct ib_cm_event *ib_event)
1490 {
1491 const struct ib_gid_attr *sgid_attr = NULL;
1492 struct net_device *ndev;
1493
1494 if (ib_event->event == IB_CM_REQ_RECEIVED)
1495 sgid_attr = ib_event->param.req_rcvd.ppath_sgid_attr;
1496 else if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED)
1497 sgid_attr = ib_event->param.sidr_req_rcvd.sgid_attr;
1498
1499 if (!sgid_attr)
1500 return NULL;
1501
1502 rcu_read_lock();
1503 ndev = rdma_read_gid_attr_ndev_rcu(sgid_attr);
1504 if (IS_ERR(ndev))
1505 ndev = NULL;
1506 else
1507 dev_hold(ndev);
1508 rcu_read_unlock();
1509 return ndev;
1510 }
1511
cma_get_net_dev(const struct ib_cm_event * ib_event,struct cma_req_info * req)1512 static struct net_device *cma_get_net_dev(const struct ib_cm_event *ib_event,
1513 struct cma_req_info *req)
1514 {
1515 struct sockaddr *listen_addr =
1516 (struct sockaddr *)&req->listen_addr_storage;
1517 struct sockaddr *src_addr = (struct sockaddr *)&req->src_addr_storage;
1518 struct net_device *net_dev;
1519 const union ib_gid *gid = req->has_gid ? &req->local_gid : NULL;
1520 int err;
1521
1522 err = cma_save_ip_info(listen_addr, src_addr, ib_event,
1523 req->service_id);
1524 if (err)
1525 return ERR_PTR(err);
1526
1527 if (rdma_protocol_roce(req->device, req->port))
1528 net_dev = roce_get_net_dev_by_cm_event(ib_event);
1529 else
1530 net_dev = ib_get_net_dev_by_params(req->device, req->port,
1531 req->pkey,
1532 gid, listen_addr);
1533 if (!net_dev)
1534 return ERR_PTR(-ENODEV);
1535
1536 return net_dev;
1537 }
1538
rdma_ps_from_service_id(__be64 service_id)1539 static enum rdma_ucm_port_space rdma_ps_from_service_id(__be64 service_id)
1540 {
1541 return (be64_to_cpu(service_id) >> 16) & 0xffff;
1542 }
1543
cma_match_private_data(struct rdma_id_private * id_priv,const struct cma_hdr * hdr)1544 static bool cma_match_private_data(struct rdma_id_private *id_priv,
1545 const struct cma_hdr *hdr)
1546 {
1547 struct sockaddr *addr = cma_src_addr(id_priv);
1548 __be32 ip4_addr;
1549 struct in6_addr ip6_addr;
1550
1551 if (cma_any_addr(addr) && !id_priv->afonly)
1552 return true;
1553
1554 switch (addr->sa_family) {
1555 case AF_INET:
1556 ip4_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
1557 if (cma_get_ip_ver(hdr) != 4)
1558 return false;
1559 if (!cma_any_addr(addr) &&
1560 hdr->dst_addr.ip4.addr != ip4_addr)
1561 return false;
1562 break;
1563 case AF_INET6:
1564 ip6_addr = ((struct sockaddr_in6 *)addr)->sin6_addr;
1565 if (cma_get_ip_ver(hdr) != 6)
1566 return false;
1567 if (!cma_any_addr(addr) &&
1568 memcmp(&hdr->dst_addr.ip6, &ip6_addr, sizeof(ip6_addr)))
1569 return false;
1570 break;
1571 case AF_IB:
1572 return true;
1573 default:
1574 return false;
1575 }
1576
1577 return true;
1578 }
1579
cma_protocol_roce(const struct rdma_cm_id * id)1580 static bool cma_protocol_roce(const struct rdma_cm_id *id)
1581 {
1582 struct ib_device *device = id->device;
1583 const u32 port_num = id->port_num ?: rdma_start_port(device);
1584
1585 return rdma_protocol_roce(device, port_num);
1586 }
1587
cma_is_req_ipv6_ll(const struct cma_req_info * req)1588 static bool cma_is_req_ipv6_ll(const struct cma_req_info *req)
1589 {
1590 const struct sockaddr *daddr =
1591 (const struct sockaddr *)&req->listen_addr_storage;
1592 const struct sockaddr_in6 *daddr6 = (const struct sockaddr_in6 *)daddr;
1593
1594 /* Returns true if the req is for IPv6 link local */
1595 return (daddr->sa_family == AF_INET6 &&
1596 (ipv6_addr_type(&daddr6->sin6_addr) & IPV6_ADDR_LINKLOCAL));
1597 }
1598
cma_match_net_dev(const struct rdma_cm_id * id,const struct net_device * net_dev,const struct cma_req_info * req)1599 static bool cma_match_net_dev(const struct rdma_cm_id *id,
1600 const struct net_device *net_dev,
1601 const struct cma_req_info *req)
1602 {
1603 const struct rdma_addr *addr = &id->route.addr;
1604
1605 if (!net_dev)
1606 /* This request is an AF_IB request */
1607 return (!id->port_num || id->port_num == req->port) &&
1608 (addr->src_addr.ss_family == AF_IB);
1609
1610 /*
1611 * If the request is not for IPv6 link local, allow matching
1612 * request to any netdevice of the one or multiport rdma device.
1613 */
1614 if (!cma_is_req_ipv6_ll(req))
1615 return true;
1616 /*
1617 * Net namespaces must match, and if the listner is listening
1618 * on a specific netdevice than netdevice must match as well.
1619 */
1620 if (net_eq(dev_net(net_dev), addr->dev_addr.net) &&
1621 (!!addr->dev_addr.bound_dev_if ==
1622 (addr->dev_addr.bound_dev_if == net_dev->ifindex)))
1623 return true;
1624 else
1625 return false;
1626 }
1627
cma_find_listener(const struct rdma_bind_list * bind_list,const struct ib_cm_id * cm_id,const struct ib_cm_event * ib_event,const struct cma_req_info * req,const struct net_device * net_dev)1628 static struct rdma_id_private *cma_find_listener(
1629 const struct rdma_bind_list *bind_list,
1630 const struct ib_cm_id *cm_id,
1631 const struct ib_cm_event *ib_event,
1632 const struct cma_req_info *req,
1633 const struct net_device *net_dev)
1634 {
1635 struct rdma_id_private *id_priv, *id_priv_dev;
1636
1637 lockdep_assert_held(&lock);
1638
1639 if (!bind_list)
1640 return ERR_PTR(-EINVAL);
1641
1642 hlist_for_each_entry(id_priv, &bind_list->owners, node) {
1643 if (cma_match_private_data(id_priv, ib_event->private_data)) {
1644 if (id_priv->id.device == cm_id->device &&
1645 cma_match_net_dev(&id_priv->id, net_dev, req))
1646 return id_priv;
1647 list_for_each_entry(id_priv_dev,
1648 &id_priv->listen_list,
1649 listen_list) {
1650 if (id_priv_dev->id.device == cm_id->device &&
1651 cma_match_net_dev(&id_priv_dev->id,
1652 net_dev, req))
1653 return id_priv_dev;
1654 }
1655 }
1656 }
1657
1658 return ERR_PTR(-EINVAL);
1659 }
1660
1661 static struct rdma_id_private *
cma_ib_id_from_event(struct ib_cm_id * cm_id,const struct ib_cm_event * ib_event,struct cma_req_info * req,struct net_device ** net_dev)1662 cma_ib_id_from_event(struct ib_cm_id *cm_id,
1663 const struct ib_cm_event *ib_event,
1664 struct cma_req_info *req,
1665 struct net_device **net_dev)
1666 {
1667 struct rdma_bind_list *bind_list;
1668 struct rdma_id_private *id_priv;
1669 int err;
1670
1671 err = cma_save_req_info(ib_event, req);
1672 if (err)
1673 return ERR_PTR(err);
1674
1675 *net_dev = cma_get_net_dev(ib_event, req);
1676 if (IS_ERR(*net_dev)) {
1677 if (PTR_ERR(*net_dev) == -EAFNOSUPPORT) {
1678 /* Assuming the protocol is AF_IB */
1679 *net_dev = NULL;
1680 } else {
1681 return ERR_CAST(*net_dev);
1682 }
1683 }
1684
1685 mutex_lock(&lock);
1686 /*
1687 * Net namespace might be getting deleted while route lookup,
1688 * cm_id lookup is in progress. Therefore, perform netdevice
1689 * validation, cm_id lookup under rcu lock.
1690 * RCU lock along with netdevice state check, synchronizes with
1691 * netdevice migrating to different net namespace and also avoids
1692 * case where net namespace doesn't get deleted while lookup is in
1693 * progress.
1694 * If the device state is not IFF_UP, its properties such as ifindex
1695 * and nd_net cannot be trusted to remain valid without rcu lock.
1696 * net/core/dev.c change_net_namespace() ensures to synchronize with
1697 * ongoing operations on net device after device is closed using
1698 * synchronize_net().
1699 */
1700 rcu_read_lock();
1701 if (*net_dev) {
1702 /*
1703 * If netdevice is down, it is likely that it is administratively
1704 * down or it might be migrating to different namespace.
1705 * In that case avoid further processing, as the net namespace
1706 * or ifindex may change.
1707 */
1708 if (((*net_dev)->flags & IFF_UP) == 0) {
1709 id_priv = ERR_PTR(-EHOSTUNREACH);
1710 goto err;
1711 }
1712
1713 if (!validate_net_dev(*net_dev,
1714 (struct sockaddr *)&req->listen_addr_storage,
1715 (struct sockaddr *)&req->src_addr_storage)) {
1716 id_priv = ERR_PTR(-EHOSTUNREACH);
1717 goto err;
1718 }
1719 }
1720
1721 bind_list = cma_ps_find(*net_dev ? dev_net(*net_dev) : &init_net,
1722 rdma_ps_from_service_id(req->service_id),
1723 cma_port_from_service_id(req->service_id));
1724 id_priv = cma_find_listener(bind_list, cm_id, ib_event, req, *net_dev);
1725 err:
1726 rcu_read_unlock();
1727 mutex_unlock(&lock);
1728 if (IS_ERR(id_priv) && *net_dev) {
1729 dev_put(*net_dev);
1730 *net_dev = NULL;
1731 }
1732 return id_priv;
1733 }
1734
cma_user_data_offset(struct rdma_id_private * id_priv)1735 static inline u8 cma_user_data_offset(struct rdma_id_private *id_priv)
1736 {
1737 return cma_family(id_priv) == AF_IB ? 0 : sizeof(struct cma_hdr);
1738 }
1739
cma_cancel_route(struct rdma_id_private * id_priv)1740 static void cma_cancel_route(struct rdma_id_private *id_priv)
1741 {
1742 if (rdma_cap_ib_sa(id_priv->id.device, id_priv->id.port_num)) {
1743 if (id_priv->query)
1744 ib_sa_cancel_query(id_priv->query_id, id_priv->query);
1745 }
1746 }
1747
cma_cancel_listens(struct rdma_id_private * id_priv)1748 static void cma_cancel_listens(struct rdma_id_private *id_priv)
1749 {
1750 struct rdma_id_private *dev_id_priv;
1751
1752 /*
1753 * Remove from listen_any_list to prevent added devices from spawning
1754 * additional listen requests.
1755 */
1756 mutex_lock(&lock);
1757 list_del(&id_priv->list);
1758
1759 while (!list_empty(&id_priv->listen_list)) {
1760 dev_id_priv = list_entry(id_priv->listen_list.next,
1761 struct rdma_id_private, listen_list);
1762 /* sync with device removal to avoid duplicate destruction */
1763 list_del_init(&dev_id_priv->list);
1764 list_del(&dev_id_priv->listen_list);
1765 mutex_unlock(&lock);
1766
1767 rdma_destroy_id(&dev_id_priv->id);
1768 mutex_lock(&lock);
1769 }
1770 mutex_unlock(&lock);
1771 }
1772
cma_cancel_operation(struct rdma_id_private * id_priv,enum rdma_cm_state state)1773 static void cma_cancel_operation(struct rdma_id_private *id_priv,
1774 enum rdma_cm_state state)
1775 {
1776 switch (state) {
1777 case RDMA_CM_ADDR_QUERY:
1778 rdma_addr_cancel(&id_priv->id.route.addr.dev_addr);
1779 break;
1780 case RDMA_CM_ROUTE_QUERY:
1781 cma_cancel_route(id_priv);
1782 break;
1783 case RDMA_CM_LISTEN:
1784 if (cma_any_addr(cma_src_addr(id_priv)) && !id_priv->cma_dev)
1785 cma_cancel_listens(id_priv);
1786 break;
1787 default:
1788 break;
1789 }
1790 }
1791
cma_release_port(struct rdma_id_private * id_priv)1792 static void cma_release_port(struct rdma_id_private *id_priv)
1793 {
1794 struct rdma_bind_list *bind_list = id_priv->bind_list;
1795 struct net *net = id_priv->id.route.addr.dev_addr.net;
1796
1797 if (!bind_list)
1798 return;
1799
1800 mutex_lock(&lock);
1801 hlist_del(&id_priv->node);
1802 if (hlist_empty(&bind_list->owners)) {
1803 cma_ps_remove(net, bind_list->ps, bind_list->port);
1804 kfree(bind_list);
1805 }
1806 mutex_unlock(&lock);
1807 }
1808
destroy_mc(struct rdma_id_private * id_priv,struct cma_multicast * mc)1809 static void destroy_mc(struct rdma_id_private *id_priv,
1810 struct cma_multicast *mc)
1811 {
1812 if (rdma_cap_ib_mcast(id_priv->id.device, id_priv->id.port_num))
1813 ib_sa_free_multicast(mc->sa_mc);
1814
1815 if (rdma_protocol_roce(id_priv->id.device, id_priv->id.port_num)) {
1816 struct rdma_dev_addr *dev_addr =
1817 &id_priv->id.route.addr.dev_addr;
1818 struct net_device *ndev = NULL;
1819
1820 if (dev_addr->bound_dev_if)
1821 ndev = dev_get_by_index(dev_addr->net,
1822 dev_addr->bound_dev_if);
1823 if (ndev) {
1824 union ib_gid mgid;
1825
1826 cma_set_mgid(id_priv, (struct sockaddr *)&mc->addr,
1827 &mgid);
1828 cma_igmp_send(ndev, &mgid, false);
1829 dev_put(ndev);
1830 }
1831
1832 cancel_work_sync(&mc->iboe_join.work);
1833 }
1834 kfree(mc);
1835 }
1836
cma_leave_mc_groups(struct rdma_id_private * id_priv)1837 static void cma_leave_mc_groups(struct rdma_id_private *id_priv)
1838 {
1839 struct cma_multicast *mc;
1840
1841 while (!list_empty(&id_priv->mc_list)) {
1842 mc = list_first_entry(&id_priv->mc_list, struct cma_multicast,
1843 list);
1844 list_del(&mc->list);
1845 destroy_mc(id_priv, mc);
1846 }
1847 }
1848
_destroy_id(struct rdma_id_private * id_priv,enum rdma_cm_state state)1849 static void _destroy_id(struct rdma_id_private *id_priv,
1850 enum rdma_cm_state state)
1851 {
1852 cma_cancel_operation(id_priv, state);
1853
1854 if (id_priv->cma_dev) {
1855 if (rdma_cap_ib_cm(id_priv->id.device, 1)) {
1856 if (id_priv->cm_id.ib)
1857 ib_destroy_cm_id(id_priv->cm_id.ib);
1858 } else if (rdma_cap_iw_cm(id_priv->id.device, 1)) {
1859 if (id_priv->cm_id.iw)
1860 iw_destroy_cm_id(id_priv->cm_id.iw);
1861 }
1862 cma_leave_mc_groups(id_priv);
1863 cma_release_dev(id_priv);
1864 }
1865
1866 cma_release_port(id_priv);
1867 cma_id_put(id_priv);
1868 wait_for_completion(&id_priv->comp);
1869
1870 if (id_priv->internal_id)
1871 cma_id_put(id_priv->id.context);
1872
1873 kfree(id_priv->id.route.path_rec);
1874
1875 put_net(id_priv->id.route.addr.dev_addr.net);
1876 rdma_restrack_del(&id_priv->res);
1877 kfree(id_priv);
1878 }
1879
1880 /*
1881 * destroy an ID from within the handler_mutex. This ensures that no other
1882 * handlers can start running concurrently.
1883 */
destroy_id_handler_unlock(struct rdma_id_private * id_priv)1884 static void destroy_id_handler_unlock(struct rdma_id_private *id_priv)
1885 __releases(&idprv->handler_mutex)
1886 {
1887 enum rdma_cm_state state;
1888 unsigned long flags;
1889
1890 trace_cm_id_destroy(id_priv);
1891
1892 /*
1893 * Setting the state to destroyed under the handler mutex provides a
1894 * fence against calling handler callbacks. If this is invoked due to
1895 * the failure of a handler callback then it guarentees that no future
1896 * handlers will be called.
1897 */
1898 lockdep_assert_held(&id_priv->handler_mutex);
1899 spin_lock_irqsave(&id_priv->lock, flags);
1900 state = id_priv->state;
1901 id_priv->state = RDMA_CM_DESTROYING;
1902 spin_unlock_irqrestore(&id_priv->lock, flags);
1903 mutex_unlock(&id_priv->handler_mutex);
1904 _destroy_id(id_priv, state);
1905 }
1906
rdma_destroy_id(struct rdma_cm_id * id)1907 void rdma_destroy_id(struct rdma_cm_id *id)
1908 {
1909 struct rdma_id_private *id_priv =
1910 container_of(id, struct rdma_id_private, id);
1911
1912 mutex_lock(&id_priv->handler_mutex);
1913 destroy_id_handler_unlock(id_priv);
1914 }
1915 EXPORT_SYMBOL(rdma_destroy_id);
1916
cma_rep_recv(struct rdma_id_private * id_priv)1917 static int cma_rep_recv(struct rdma_id_private *id_priv)
1918 {
1919 int ret;
1920
1921 ret = cma_modify_qp_rtr(id_priv, NULL);
1922 if (ret)
1923 goto reject;
1924
1925 ret = cma_modify_qp_rts(id_priv, NULL);
1926 if (ret)
1927 goto reject;
1928
1929 trace_cm_send_rtu(id_priv);
1930 ret = ib_send_cm_rtu(id_priv->cm_id.ib, NULL, 0);
1931 if (ret)
1932 goto reject;
1933
1934 return 0;
1935 reject:
1936 pr_debug_ratelimited("RDMA CM: CONNECT_ERROR: failed to handle reply. status %d\n", ret);
1937 cma_modify_qp_err(id_priv);
1938 trace_cm_send_rej(id_priv);
1939 ib_send_cm_rej(id_priv->cm_id.ib, IB_CM_REJ_CONSUMER_DEFINED,
1940 NULL, 0, NULL, 0);
1941 return ret;
1942 }
1943
cma_set_rep_event_data(struct rdma_cm_event * event,const struct ib_cm_rep_event_param * rep_data,void * private_data)1944 static void cma_set_rep_event_data(struct rdma_cm_event *event,
1945 const struct ib_cm_rep_event_param *rep_data,
1946 void *private_data)
1947 {
1948 event->param.conn.private_data = private_data;
1949 event->param.conn.private_data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
1950 event->param.conn.responder_resources = rep_data->responder_resources;
1951 event->param.conn.initiator_depth = rep_data->initiator_depth;
1952 event->param.conn.flow_control = rep_data->flow_control;
1953 event->param.conn.rnr_retry_count = rep_data->rnr_retry_count;
1954 event->param.conn.srq = rep_data->srq;
1955 event->param.conn.qp_num = rep_data->remote_qpn;
1956
1957 event->ece.vendor_id = rep_data->ece.vendor_id;
1958 event->ece.attr_mod = rep_data->ece.attr_mod;
1959 }
1960
cma_cm_event_handler(struct rdma_id_private * id_priv,struct rdma_cm_event * event)1961 static int cma_cm_event_handler(struct rdma_id_private *id_priv,
1962 struct rdma_cm_event *event)
1963 {
1964 int ret;
1965
1966 lockdep_assert_held(&id_priv->handler_mutex);
1967
1968 trace_cm_event_handler(id_priv, event);
1969 ret = id_priv->id.event_handler(&id_priv->id, event);
1970 trace_cm_event_done(id_priv, event, ret);
1971 return ret;
1972 }
1973
cma_ib_handler(struct ib_cm_id * cm_id,const struct ib_cm_event * ib_event)1974 static int cma_ib_handler(struct ib_cm_id *cm_id,
1975 const struct ib_cm_event *ib_event)
1976 {
1977 struct rdma_id_private *id_priv = cm_id->context;
1978 struct rdma_cm_event event = {};
1979 enum rdma_cm_state state;
1980 int ret;
1981
1982 mutex_lock(&id_priv->handler_mutex);
1983 state = READ_ONCE(id_priv->state);
1984 if ((ib_event->event != IB_CM_TIMEWAIT_EXIT &&
1985 state != RDMA_CM_CONNECT) ||
1986 (ib_event->event == IB_CM_TIMEWAIT_EXIT &&
1987 state != RDMA_CM_DISCONNECT))
1988 goto out;
1989
1990 switch (ib_event->event) {
1991 case IB_CM_REQ_ERROR:
1992 case IB_CM_REP_ERROR:
1993 event.event = RDMA_CM_EVENT_UNREACHABLE;
1994 event.status = -ETIMEDOUT;
1995 break;
1996 case IB_CM_REP_RECEIVED:
1997 if (state == RDMA_CM_CONNECT &&
1998 (id_priv->id.qp_type != IB_QPT_UD)) {
1999 trace_cm_send_mra(id_priv);
2000 ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0);
2001 }
2002 if (id_priv->id.qp) {
2003 event.status = cma_rep_recv(id_priv);
2004 event.event = event.status ? RDMA_CM_EVENT_CONNECT_ERROR :
2005 RDMA_CM_EVENT_ESTABLISHED;
2006 } else {
2007 event.event = RDMA_CM_EVENT_CONNECT_RESPONSE;
2008 }
2009 cma_set_rep_event_data(&event, &ib_event->param.rep_rcvd,
2010 ib_event->private_data);
2011 break;
2012 case IB_CM_RTU_RECEIVED:
2013 case IB_CM_USER_ESTABLISHED:
2014 event.event = RDMA_CM_EVENT_ESTABLISHED;
2015 break;
2016 case IB_CM_DREQ_ERROR:
2017 event.status = -ETIMEDOUT;
2018 fallthrough;
2019 case IB_CM_DREQ_RECEIVED:
2020 case IB_CM_DREP_RECEIVED:
2021 if (!cma_comp_exch(id_priv, RDMA_CM_CONNECT,
2022 RDMA_CM_DISCONNECT))
2023 goto out;
2024 event.event = RDMA_CM_EVENT_DISCONNECTED;
2025 break;
2026 case IB_CM_TIMEWAIT_EXIT:
2027 event.event = RDMA_CM_EVENT_TIMEWAIT_EXIT;
2028 break;
2029 case IB_CM_MRA_RECEIVED:
2030 /* ignore event */
2031 goto out;
2032 case IB_CM_REJ_RECEIVED:
2033 pr_debug_ratelimited("RDMA CM: REJECTED: %s\n", rdma_reject_msg(&id_priv->id,
2034 ib_event->param.rej_rcvd.reason));
2035 cma_modify_qp_err(id_priv);
2036 event.status = ib_event->param.rej_rcvd.reason;
2037 event.event = RDMA_CM_EVENT_REJECTED;
2038 event.param.conn.private_data = ib_event->private_data;
2039 event.param.conn.private_data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
2040 break;
2041 default:
2042 pr_err("RDMA CMA: unexpected IB CM event: %d\n",
2043 ib_event->event);
2044 goto out;
2045 }
2046
2047 ret = cma_cm_event_handler(id_priv, &event);
2048 if (ret) {
2049 /* Destroy the CM ID by returning a non-zero value. */
2050 id_priv->cm_id.ib = NULL;
2051 destroy_id_handler_unlock(id_priv);
2052 return ret;
2053 }
2054 out:
2055 mutex_unlock(&id_priv->handler_mutex);
2056 return 0;
2057 }
2058
2059 static struct rdma_id_private *
cma_ib_new_conn_id(const struct rdma_cm_id * listen_id,const struct ib_cm_event * ib_event,struct net_device * net_dev)2060 cma_ib_new_conn_id(const struct rdma_cm_id *listen_id,
2061 const struct ib_cm_event *ib_event,
2062 struct net_device *net_dev)
2063 {
2064 struct rdma_id_private *listen_id_priv;
2065 struct rdma_id_private *id_priv;
2066 struct rdma_cm_id *id;
2067 struct rdma_route *rt;
2068 const sa_family_t ss_family = listen_id->route.addr.src_addr.ss_family;
2069 struct sa_path_rec *path = ib_event->param.req_rcvd.primary_path;
2070 const __be64 service_id =
2071 ib_event->param.req_rcvd.primary_path->service_id;
2072 int ret;
2073
2074 listen_id_priv = container_of(listen_id, struct rdma_id_private, id);
2075 id_priv = __rdma_create_id(listen_id->route.addr.dev_addr.net,
2076 listen_id->event_handler, listen_id->context,
2077 listen_id->ps,
2078 ib_event->param.req_rcvd.qp_type,
2079 listen_id_priv);
2080 if (IS_ERR(id_priv))
2081 return NULL;
2082
2083 id = &id_priv->id;
2084 if (cma_save_net_info((struct sockaddr *)&id->route.addr.src_addr,
2085 (struct sockaddr *)&id->route.addr.dst_addr,
2086 listen_id, ib_event, ss_family, service_id))
2087 goto err;
2088
2089 rt = &id->route;
2090 rt->num_paths = ib_event->param.req_rcvd.alternate_path ? 2 : 1;
2091 rt->path_rec = kmalloc_array(rt->num_paths, sizeof(*rt->path_rec),
2092 GFP_KERNEL);
2093 if (!rt->path_rec)
2094 goto err;
2095
2096 rt->path_rec[0] = *path;
2097 if (rt->num_paths == 2)
2098 rt->path_rec[1] = *ib_event->param.req_rcvd.alternate_path;
2099
2100 if (net_dev) {
2101 rdma_copy_src_l2_addr(&rt->addr.dev_addr, net_dev);
2102 } else {
2103 if (!cma_protocol_roce(listen_id) &&
2104 cma_any_addr(cma_src_addr(id_priv))) {
2105 rt->addr.dev_addr.dev_type = ARPHRD_INFINIBAND;
2106 rdma_addr_set_sgid(&rt->addr.dev_addr, &rt->path_rec[0].sgid);
2107 ib_addr_set_pkey(&rt->addr.dev_addr, be16_to_cpu(rt->path_rec[0].pkey));
2108 } else if (!cma_any_addr(cma_src_addr(id_priv))) {
2109 ret = cma_translate_addr(cma_src_addr(id_priv), &rt->addr.dev_addr);
2110 if (ret)
2111 goto err;
2112 }
2113 }
2114 rdma_addr_set_dgid(&rt->addr.dev_addr, &rt->path_rec[0].dgid);
2115
2116 id_priv->state = RDMA_CM_CONNECT;
2117 return id_priv;
2118
2119 err:
2120 rdma_destroy_id(id);
2121 return NULL;
2122 }
2123
2124 static struct rdma_id_private *
cma_ib_new_udp_id(const struct rdma_cm_id * listen_id,const struct ib_cm_event * ib_event,struct net_device * net_dev)2125 cma_ib_new_udp_id(const struct rdma_cm_id *listen_id,
2126 const struct ib_cm_event *ib_event,
2127 struct net_device *net_dev)
2128 {
2129 const struct rdma_id_private *listen_id_priv;
2130 struct rdma_id_private *id_priv;
2131 struct rdma_cm_id *id;
2132 const sa_family_t ss_family = listen_id->route.addr.src_addr.ss_family;
2133 struct net *net = listen_id->route.addr.dev_addr.net;
2134 int ret;
2135
2136 listen_id_priv = container_of(listen_id, struct rdma_id_private, id);
2137 id_priv = __rdma_create_id(net, listen_id->event_handler,
2138 listen_id->context, listen_id->ps, IB_QPT_UD,
2139 listen_id_priv);
2140 if (IS_ERR(id_priv))
2141 return NULL;
2142
2143 id = &id_priv->id;
2144 if (cma_save_net_info((struct sockaddr *)&id->route.addr.src_addr,
2145 (struct sockaddr *)&id->route.addr.dst_addr,
2146 listen_id, ib_event, ss_family,
2147 ib_event->param.sidr_req_rcvd.service_id))
2148 goto err;
2149
2150 if (net_dev) {
2151 rdma_copy_src_l2_addr(&id->route.addr.dev_addr, net_dev);
2152 } else {
2153 if (!cma_any_addr(cma_src_addr(id_priv))) {
2154 ret = cma_translate_addr(cma_src_addr(id_priv),
2155 &id->route.addr.dev_addr);
2156 if (ret)
2157 goto err;
2158 }
2159 }
2160
2161 id_priv->state = RDMA_CM_CONNECT;
2162 return id_priv;
2163 err:
2164 rdma_destroy_id(id);
2165 return NULL;
2166 }
2167
cma_set_req_event_data(struct rdma_cm_event * event,const struct ib_cm_req_event_param * req_data,void * private_data,int offset)2168 static void cma_set_req_event_data(struct rdma_cm_event *event,
2169 const struct ib_cm_req_event_param *req_data,
2170 void *private_data, int offset)
2171 {
2172 event->param.conn.private_data = private_data + offset;
2173 event->param.conn.private_data_len = IB_CM_REQ_PRIVATE_DATA_SIZE - offset;
2174 event->param.conn.responder_resources = req_data->responder_resources;
2175 event->param.conn.initiator_depth = req_data->initiator_depth;
2176 event->param.conn.flow_control = req_data->flow_control;
2177 event->param.conn.retry_count = req_data->retry_count;
2178 event->param.conn.rnr_retry_count = req_data->rnr_retry_count;
2179 event->param.conn.srq = req_data->srq;
2180 event->param.conn.qp_num = req_data->remote_qpn;
2181
2182 event->ece.vendor_id = req_data->ece.vendor_id;
2183 event->ece.attr_mod = req_data->ece.attr_mod;
2184 }
2185
cma_ib_check_req_qp_type(const struct rdma_cm_id * id,const struct ib_cm_event * ib_event)2186 static int cma_ib_check_req_qp_type(const struct rdma_cm_id *id,
2187 const struct ib_cm_event *ib_event)
2188 {
2189 return (((ib_event->event == IB_CM_REQ_RECEIVED) &&
2190 (ib_event->param.req_rcvd.qp_type == id->qp_type)) ||
2191 ((ib_event->event == IB_CM_SIDR_REQ_RECEIVED) &&
2192 (id->qp_type == IB_QPT_UD)) ||
2193 (!id->qp_type));
2194 }
2195
cma_ib_req_handler(struct ib_cm_id * cm_id,const struct ib_cm_event * ib_event)2196 static int cma_ib_req_handler(struct ib_cm_id *cm_id,
2197 const struct ib_cm_event *ib_event)
2198 {
2199 struct rdma_id_private *listen_id, *conn_id = NULL;
2200 struct rdma_cm_event event = {};
2201 struct cma_req_info req = {};
2202 struct net_device *net_dev;
2203 u8 offset;
2204 int ret;
2205
2206 listen_id = cma_ib_id_from_event(cm_id, ib_event, &req, &net_dev);
2207 if (IS_ERR(listen_id))
2208 return PTR_ERR(listen_id);
2209
2210 trace_cm_req_handler(listen_id, ib_event->event);
2211 if (!cma_ib_check_req_qp_type(&listen_id->id, ib_event)) {
2212 ret = -EINVAL;
2213 goto net_dev_put;
2214 }
2215
2216 mutex_lock(&listen_id->handler_mutex);
2217 if (READ_ONCE(listen_id->state) != RDMA_CM_LISTEN) {
2218 ret = -ECONNABORTED;
2219 goto err_unlock;
2220 }
2221
2222 offset = cma_user_data_offset(listen_id);
2223 event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
2224 if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED) {
2225 conn_id = cma_ib_new_udp_id(&listen_id->id, ib_event, net_dev);
2226 event.param.ud.private_data = ib_event->private_data + offset;
2227 event.param.ud.private_data_len =
2228 IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE - offset;
2229 } else {
2230 conn_id = cma_ib_new_conn_id(&listen_id->id, ib_event, net_dev);
2231 cma_set_req_event_data(&event, &ib_event->param.req_rcvd,
2232 ib_event->private_data, offset);
2233 }
2234 if (!conn_id) {
2235 ret = -ENOMEM;
2236 goto err_unlock;
2237 }
2238
2239 mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
2240 ret = cma_ib_acquire_dev(conn_id, listen_id, &req);
2241 if (ret) {
2242 destroy_id_handler_unlock(conn_id);
2243 goto err_unlock;
2244 }
2245
2246 conn_id->cm_id.ib = cm_id;
2247 cm_id->context = conn_id;
2248 cm_id->cm_handler = cma_ib_handler;
2249
2250 ret = cma_cm_event_handler(conn_id, &event);
2251 if (ret) {
2252 /* Destroy the CM ID by returning a non-zero value. */
2253 conn_id->cm_id.ib = NULL;
2254 mutex_unlock(&listen_id->handler_mutex);
2255 destroy_id_handler_unlock(conn_id);
2256 goto net_dev_put;
2257 }
2258
2259 if (READ_ONCE(conn_id->state) == RDMA_CM_CONNECT &&
2260 conn_id->id.qp_type != IB_QPT_UD) {
2261 trace_cm_send_mra(cm_id->context);
2262 ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0);
2263 }
2264 mutex_unlock(&conn_id->handler_mutex);
2265
2266 err_unlock:
2267 mutex_unlock(&listen_id->handler_mutex);
2268
2269 net_dev_put:
2270 if (net_dev)
2271 dev_put(net_dev);
2272
2273 return ret;
2274 }
2275
rdma_get_service_id(struct rdma_cm_id * id,struct sockaddr * addr)2276 __be64 rdma_get_service_id(struct rdma_cm_id *id, struct sockaddr *addr)
2277 {
2278 if (addr->sa_family == AF_IB)
2279 return ((struct sockaddr_ib *) addr)->sib_sid;
2280
2281 return cpu_to_be64(((u64)id->ps << 16) + be16_to_cpu(cma_port(addr)));
2282 }
2283 EXPORT_SYMBOL(rdma_get_service_id);
2284
rdma_read_gids(struct rdma_cm_id * cm_id,union ib_gid * sgid,union ib_gid * dgid)2285 void rdma_read_gids(struct rdma_cm_id *cm_id, union ib_gid *sgid,
2286 union ib_gid *dgid)
2287 {
2288 struct rdma_addr *addr = &cm_id->route.addr;
2289
2290 if (!cm_id->device) {
2291 if (sgid)
2292 memset(sgid, 0, sizeof(*sgid));
2293 if (dgid)
2294 memset(dgid, 0, sizeof(*dgid));
2295 return;
2296 }
2297
2298 if (rdma_protocol_roce(cm_id->device, cm_id->port_num)) {
2299 if (sgid)
2300 rdma_ip2gid((struct sockaddr *)&addr->src_addr, sgid);
2301 if (dgid)
2302 rdma_ip2gid((struct sockaddr *)&addr->dst_addr, dgid);
2303 } else {
2304 if (sgid)
2305 rdma_addr_get_sgid(&addr->dev_addr, sgid);
2306 if (dgid)
2307 rdma_addr_get_dgid(&addr->dev_addr, dgid);
2308 }
2309 }
2310 EXPORT_SYMBOL(rdma_read_gids);
2311
cma_iw_handler(struct iw_cm_id * iw_id,struct iw_cm_event * iw_event)2312 static int cma_iw_handler(struct iw_cm_id *iw_id, struct iw_cm_event *iw_event)
2313 {
2314 struct rdma_id_private *id_priv = iw_id->context;
2315 struct rdma_cm_event event = {};
2316 int ret = 0;
2317 struct sockaddr *laddr = (struct sockaddr *)&iw_event->local_addr;
2318 struct sockaddr *raddr = (struct sockaddr *)&iw_event->remote_addr;
2319
2320 mutex_lock(&id_priv->handler_mutex);
2321 if (READ_ONCE(id_priv->state) != RDMA_CM_CONNECT)
2322 goto out;
2323
2324 switch (iw_event->event) {
2325 case IW_CM_EVENT_CLOSE:
2326 event.event = RDMA_CM_EVENT_DISCONNECTED;
2327 break;
2328 case IW_CM_EVENT_CONNECT_REPLY:
2329 memcpy(cma_src_addr(id_priv), laddr,
2330 rdma_addr_size(laddr));
2331 memcpy(cma_dst_addr(id_priv), raddr,
2332 rdma_addr_size(raddr));
2333 switch (iw_event->status) {
2334 case 0:
2335 event.event = RDMA_CM_EVENT_ESTABLISHED;
2336 event.param.conn.initiator_depth = iw_event->ird;
2337 event.param.conn.responder_resources = iw_event->ord;
2338 break;
2339 case -ECONNRESET:
2340 case -ECONNREFUSED:
2341 event.event = RDMA_CM_EVENT_REJECTED;
2342 break;
2343 case -ETIMEDOUT:
2344 event.event = RDMA_CM_EVENT_UNREACHABLE;
2345 break;
2346 default:
2347 event.event = RDMA_CM_EVENT_CONNECT_ERROR;
2348 break;
2349 }
2350 break;
2351 case IW_CM_EVENT_ESTABLISHED:
2352 event.event = RDMA_CM_EVENT_ESTABLISHED;
2353 event.param.conn.initiator_depth = iw_event->ird;
2354 event.param.conn.responder_resources = iw_event->ord;
2355 break;
2356 default:
2357 goto out;
2358 }
2359
2360 event.status = iw_event->status;
2361 event.param.conn.private_data = iw_event->private_data;
2362 event.param.conn.private_data_len = iw_event->private_data_len;
2363 ret = cma_cm_event_handler(id_priv, &event);
2364 if (ret) {
2365 /* Destroy the CM ID by returning a non-zero value. */
2366 id_priv->cm_id.iw = NULL;
2367 destroy_id_handler_unlock(id_priv);
2368 return ret;
2369 }
2370
2371 out:
2372 mutex_unlock(&id_priv->handler_mutex);
2373 return ret;
2374 }
2375
iw_conn_req_handler(struct iw_cm_id * cm_id,struct iw_cm_event * iw_event)2376 static int iw_conn_req_handler(struct iw_cm_id *cm_id,
2377 struct iw_cm_event *iw_event)
2378 {
2379 struct rdma_id_private *listen_id, *conn_id;
2380 struct rdma_cm_event event = {};
2381 int ret = -ECONNABORTED;
2382 struct sockaddr *laddr = (struct sockaddr *)&iw_event->local_addr;
2383 struct sockaddr *raddr = (struct sockaddr *)&iw_event->remote_addr;
2384
2385 event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
2386 event.param.conn.private_data = iw_event->private_data;
2387 event.param.conn.private_data_len = iw_event->private_data_len;
2388 event.param.conn.initiator_depth = iw_event->ird;
2389 event.param.conn.responder_resources = iw_event->ord;
2390
2391 listen_id = cm_id->context;
2392
2393 mutex_lock(&listen_id->handler_mutex);
2394 if (READ_ONCE(listen_id->state) != RDMA_CM_LISTEN)
2395 goto out;
2396
2397 /* Create a new RDMA id for the new IW CM ID */
2398 conn_id = __rdma_create_id(listen_id->id.route.addr.dev_addr.net,
2399 listen_id->id.event_handler,
2400 listen_id->id.context, RDMA_PS_TCP,
2401 IB_QPT_RC, listen_id);
2402 if (IS_ERR(conn_id)) {
2403 ret = -ENOMEM;
2404 goto out;
2405 }
2406 mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
2407 conn_id->state = RDMA_CM_CONNECT;
2408
2409 ret = rdma_translate_ip(laddr, &conn_id->id.route.addr.dev_addr);
2410 if (ret) {
2411 mutex_unlock(&listen_id->handler_mutex);
2412 destroy_id_handler_unlock(conn_id);
2413 return ret;
2414 }
2415
2416 ret = cma_iw_acquire_dev(conn_id, listen_id);
2417 if (ret) {
2418 mutex_unlock(&listen_id->handler_mutex);
2419 destroy_id_handler_unlock(conn_id);
2420 return ret;
2421 }
2422
2423 conn_id->cm_id.iw = cm_id;
2424 cm_id->context = conn_id;
2425 cm_id->cm_handler = cma_iw_handler;
2426
2427 memcpy(cma_src_addr(conn_id), laddr, rdma_addr_size(laddr));
2428 memcpy(cma_dst_addr(conn_id), raddr, rdma_addr_size(raddr));
2429
2430 ret = cma_cm_event_handler(conn_id, &event);
2431 if (ret) {
2432 /* User wants to destroy the CM ID */
2433 conn_id->cm_id.iw = NULL;
2434 mutex_unlock(&listen_id->handler_mutex);
2435 destroy_id_handler_unlock(conn_id);
2436 return ret;
2437 }
2438
2439 mutex_unlock(&conn_id->handler_mutex);
2440
2441 out:
2442 mutex_unlock(&listen_id->handler_mutex);
2443 return ret;
2444 }
2445
cma_ib_listen(struct rdma_id_private * id_priv)2446 static int cma_ib_listen(struct rdma_id_private *id_priv)
2447 {
2448 struct sockaddr *addr;
2449 struct ib_cm_id *id;
2450 __be64 svc_id;
2451
2452 addr = cma_src_addr(id_priv);
2453 svc_id = rdma_get_service_id(&id_priv->id, addr);
2454 id = ib_cm_insert_listen(id_priv->id.device,
2455 cma_ib_req_handler, svc_id);
2456 if (IS_ERR(id))
2457 return PTR_ERR(id);
2458 id_priv->cm_id.ib = id;
2459
2460 return 0;
2461 }
2462
cma_iw_listen(struct rdma_id_private * id_priv,int backlog)2463 static int cma_iw_listen(struct rdma_id_private *id_priv, int backlog)
2464 {
2465 int ret;
2466 struct iw_cm_id *id;
2467
2468 id = iw_create_cm_id(id_priv->id.device,
2469 iw_conn_req_handler,
2470 id_priv);
2471 if (IS_ERR(id))
2472 return PTR_ERR(id);
2473
2474 id->tos = id_priv->tos;
2475 id->tos_set = id_priv->tos_set;
2476 id->afonly = id_priv->afonly;
2477 id_priv->cm_id.iw = id;
2478
2479 memcpy(&id_priv->cm_id.iw->local_addr, cma_src_addr(id_priv),
2480 rdma_addr_size(cma_src_addr(id_priv)));
2481
2482 ret = iw_cm_listen(id_priv->cm_id.iw, backlog);
2483
2484 if (ret) {
2485 iw_destroy_cm_id(id_priv->cm_id.iw);
2486 id_priv->cm_id.iw = NULL;
2487 }
2488
2489 return ret;
2490 }
2491
cma_listen_handler(struct rdma_cm_id * id,struct rdma_cm_event * event)2492 static int cma_listen_handler(struct rdma_cm_id *id,
2493 struct rdma_cm_event *event)
2494 {
2495 struct rdma_id_private *id_priv = id->context;
2496
2497 /* Listening IDs are always destroyed on removal */
2498 if (event->event == RDMA_CM_EVENT_DEVICE_REMOVAL)
2499 return -1;
2500
2501 id->context = id_priv->id.context;
2502 id->event_handler = id_priv->id.event_handler;
2503 trace_cm_event_handler(id_priv, event);
2504 return id_priv->id.event_handler(id, event);
2505 }
2506
cma_listen_on_dev(struct rdma_id_private * id_priv,struct cma_device * cma_dev,struct rdma_id_private ** to_destroy)2507 static int cma_listen_on_dev(struct rdma_id_private *id_priv,
2508 struct cma_device *cma_dev,
2509 struct rdma_id_private **to_destroy)
2510 {
2511 struct rdma_id_private *dev_id_priv;
2512 struct net *net = id_priv->id.route.addr.dev_addr.net;
2513 int ret;
2514
2515 lockdep_assert_held(&lock);
2516
2517 *to_destroy = NULL;
2518 if (cma_family(id_priv) == AF_IB && !rdma_cap_ib_cm(cma_dev->device, 1))
2519 return 0;
2520
2521 dev_id_priv =
2522 __rdma_create_id(net, cma_listen_handler, id_priv,
2523 id_priv->id.ps, id_priv->id.qp_type, id_priv);
2524 if (IS_ERR(dev_id_priv))
2525 return PTR_ERR(dev_id_priv);
2526
2527 dev_id_priv->state = RDMA_CM_ADDR_BOUND;
2528 memcpy(cma_src_addr(dev_id_priv), cma_src_addr(id_priv),
2529 rdma_addr_size(cma_src_addr(id_priv)));
2530
2531 _cma_attach_to_dev(dev_id_priv, cma_dev);
2532 rdma_restrack_add(&dev_id_priv->res);
2533 cma_id_get(id_priv);
2534 dev_id_priv->internal_id = 1;
2535 dev_id_priv->afonly = id_priv->afonly;
2536 dev_id_priv->tos_set = id_priv->tos_set;
2537 dev_id_priv->tos = id_priv->tos;
2538
2539 ret = rdma_listen(&dev_id_priv->id, id_priv->backlog);
2540 if (ret)
2541 goto err_listen;
2542 list_add_tail(&dev_id_priv->listen_list, &id_priv->listen_list);
2543 return 0;
2544 err_listen:
2545 /* Caller must destroy this after releasing lock */
2546 *to_destroy = dev_id_priv;
2547 dev_warn(&cma_dev->device->dev, "RDMA CMA: %s, error %d\n", __func__, ret);
2548 return ret;
2549 }
2550
cma_listen_on_all(struct rdma_id_private * id_priv)2551 static int cma_listen_on_all(struct rdma_id_private *id_priv)
2552 {
2553 struct rdma_id_private *to_destroy;
2554 struct cma_device *cma_dev;
2555 int ret;
2556
2557 mutex_lock(&lock);
2558 list_add_tail(&id_priv->list, &listen_any_list);
2559 list_for_each_entry(cma_dev, &dev_list, list) {
2560 ret = cma_listen_on_dev(id_priv, cma_dev, &to_destroy);
2561 if (ret) {
2562 /* Prevent racing with cma_process_remove() */
2563 if (to_destroy)
2564 list_del_init(&to_destroy->list);
2565 goto err_listen;
2566 }
2567 }
2568 mutex_unlock(&lock);
2569 return 0;
2570
2571 err_listen:
2572 list_del(&id_priv->list);
2573 mutex_unlock(&lock);
2574 if (to_destroy)
2575 rdma_destroy_id(&to_destroy->id);
2576 return ret;
2577 }
2578
rdma_set_service_type(struct rdma_cm_id * id,int tos)2579 void rdma_set_service_type(struct rdma_cm_id *id, int tos)
2580 {
2581 struct rdma_id_private *id_priv;
2582
2583 id_priv = container_of(id, struct rdma_id_private, id);
2584 id_priv->tos = (u8) tos;
2585 id_priv->tos_set = true;
2586 }
2587 EXPORT_SYMBOL(rdma_set_service_type);
2588
2589 /**
2590 * rdma_set_ack_timeout() - Set the ack timeout of QP associated
2591 * with a connection identifier.
2592 * @id: Communication identifier to associated with service type.
2593 * @timeout: Ack timeout to set a QP, expressed as 4.096 * 2^(timeout) usec.
2594 *
2595 * This function should be called before rdma_connect() on active side,
2596 * and on passive side before rdma_accept(). It is applicable to primary
2597 * path only. The timeout will affect the local side of the QP, it is not
2598 * negotiated with remote side and zero disables the timer. In case it is
2599 * set before rdma_resolve_route, the value will also be used to determine
2600 * PacketLifeTime for RoCE.
2601 *
2602 * Return: 0 for success
2603 */
rdma_set_ack_timeout(struct rdma_cm_id * id,u8 timeout)2604 int rdma_set_ack_timeout(struct rdma_cm_id *id, u8 timeout)
2605 {
2606 struct rdma_id_private *id_priv;
2607
2608 if (id->qp_type != IB_QPT_RC)
2609 return -EINVAL;
2610
2611 id_priv = container_of(id, struct rdma_id_private, id);
2612 id_priv->timeout = timeout;
2613 id_priv->timeout_set = true;
2614
2615 return 0;
2616 }
2617 EXPORT_SYMBOL(rdma_set_ack_timeout);
2618
2619 /**
2620 * rdma_set_min_rnr_timer() - Set the minimum RNR Retry timer of the
2621 * QP associated with a connection identifier.
2622 * @id: Communication identifier to associated with service type.
2623 * @min_rnr_timer: 5-bit value encoded as Table 45: "Encoding for RNR NAK
2624 * Timer Field" in the IBTA specification.
2625 *
2626 * This function should be called before rdma_connect() on active
2627 * side, and on passive side before rdma_accept(). The timer value
2628 * will be associated with the local QP. When it receives a send it is
2629 * not read to handle, typically if the receive queue is empty, an RNR
2630 * Retry NAK is returned to the requester with the min_rnr_timer
2631 * encoded. The requester will then wait at least the time specified
2632 * in the NAK before retrying. The default is zero, which translates
2633 * to a minimum RNR Timer value of 655 ms.
2634 *
2635 * Return: 0 for success
2636 */
rdma_set_min_rnr_timer(struct rdma_cm_id * id,u8 min_rnr_timer)2637 int rdma_set_min_rnr_timer(struct rdma_cm_id *id, u8 min_rnr_timer)
2638 {
2639 struct rdma_id_private *id_priv;
2640
2641 /* It is a five-bit value */
2642 if (min_rnr_timer & 0xe0)
2643 return -EINVAL;
2644
2645 if (WARN_ON(id->qp_type != IB_QPT_RC && id->qp_type != IB_QPT_XRC_TGT))
2646 return -EINVAL;
2647
2648 id_priv = container_of(id, struct rdma_id_private, id);
2649 id_priv->min_rnr_timer = min_rnr_timer;
2650 id_priv->min_rnr_timer_set = true;
2651
2652 return 0;
2653 }
2654 EXPORT_SYMBOL(rdma_set_min_rnr_timer);
2655
cma_query_handler(int status,struct sa_path_rec * path_rec,void * context)2656 static void cma_query_handler(int status, struct sa_path_rec *path_rec,
2657 void *context)
2658 {
2659 struct cma_work *work = context;
2660 struct rdma_route *route;
2661
2662 route = &work->id->id.route;
2663
2664 if (!status) {
2665 route->num_paths = 1;
2666 *route->path_rec = *path_rec;
2667 } else {
2668 work->old_state = RDMA_CM_ROUTE_QUERY;
2669 work->new_state = RDMA_CM_ADDR_RESOLVED;
2670 work->event.event = RDMA_CM_EVENT_ROUTE_ERROR;
2671 work->event.status = status;
2672 pr_debug_ratelimited("RDMA CM: ROUTE_ERROR: failed to query path. status %d\n",
2673 status);
2674 }
2675
2676 queue_work(cma_wq, &work->work);
2677 }
2678
cma_query_ib_route(struct rdma_id_private * id_priv,unsigned long timeout_ms,struct cma_work * work)2679 static int cma_query_ib_route(struct rdma_id_private *id_priv,
2680 unsigned long timeout_ms, struct cma_work *work)
2681 {
2682 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
2683 struct sa_path_rec path_rec;
2684 ib_sa_comp_mask comp_mask;
2685 struct sockaddr_in6 *sin6;
2686 struct sockaddr_ib *sib;
2687
2688 memset(&path_rec, 0, sizeof path_rec);
2689
2690 if (rdma_cap_opa_ah(id_priv->id.device, id_priv->id.port_num))
2691 path_rec.rec_type = SA_PATH_REC_TYPE_OPA;
2692 else
2693 path_rec.rec_type = SA_PATH_REC_TYPE_IB;
2694 rdma_addr_get_sgid(dev_addr, &path_rec.sgid);
2695 rdma_addr_get_dgid(dev_addr, &path_rec.dgid);
2696 path_rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
2697 path_rec.numb_path = 1;
2698 path_rec.reversible = 1;
2699 path_rec.service_id = rdma_get_service_id(&id_priv->id,
2700 cma_dst_addr(id_priv));
2701
2702 comp_mask = IB_SA_PATH_REC_DGID | IB_SA_PATH_REC_SGID |
2703 IB_SA_PATH_REC_PKEY | IB_SA_PATH_REC_NUMB_PATH |
2704 IB_SA_PATH_REC_REVERSIBLE | IB_SA_PATH_REC_SERVICE_ID;
2705
2706 switch (cma_family(id_priv)) {
2707 case AF_INET:
2708 path_rec.qos_class = cpu_to_be16((u16) id_priv->tos);
2709 comp_mask |= IB_SA_PATH_REC_QOS_CLASS;
2710 break;
2711 case AF_INET6:
2712 sin6 = (struct sockaddr_in6 *) cma_src_addr(id_priv);
2713 path_rec.traffic_class = (u8) (be32_to_cpu(sin6->sin6_flowinfo) >> 20);
2714 comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
2715 break;
2716 case AF_IB:
2717 sib = (struct sockaddr_ib *) cma_src_addr(id_priv);
2718 path_rec.traffic_class = (u8) (be32_to_cpu(sib->sib_flowinfo) >> 20);
2719 comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
2720 break;
2721 }
2722
2723 id_priv->query_id = ib_sa_path_rec_get(&sa_client, id_priv->id.device,
2724 id_priv->id.port_num, &path_rec,
2725 comp_mask, timeout_ms,
2726 GFP_KERNEL, cma_query_handler,
2727 work, &id_priv->query);
2728
2729 return (id_priv->query_id < 0) ? id_priv->query_id : 0;
2730 }
2731
cma_iboe_join_work_handler(struct work_struct * work)2732 static void cma_iboe_join_work_handler(struct work_struct *work)
2733 {
2734 struct cma_multicast *mc =
2735 container_of(work, struct cma_multicast, iboe_join.work);
2736 struct rdma_cm_event *event = &mc->iboe_join.event;
2737 struct rdma_id_private *id_priv = mc->id_priv;
2738 int ret;
2739
2740 mutex_lock(&id_priv->handler_mutex);
2741 if (READ_ONCE(id_priv->state) == RDMA_CM_DESTROYING ||
2742 READ_ONCE(id_priv->state) == RDMA_CM_DEVICE_REMOVAL)
2743 goto out_unlock;
2744
2745 ret = cma_cm_event_handler(id_priv, event);
2746 WARN_ON(ret);
2747
2748 out_unlock:
2749 mutex_unlock(&id_priv->handler_mutex);
2750 if (event->event == RDMA_CM_EVENT_MULTICAST_JOIN)
2751 rdma_destroy_ah_attr(&event->param.ud.ah_attr);
2752 }
2753
cma_work_handler(struct work_struct * _work)2754 static void cma_work_handler(struct work_struct *_work)
2755 {
2756 struct cma_work *work = container_of(_work, struct cma_work, work);
2757 struct rdma_id_private *id_priv = work->id;
2758
2759 mutex_lock(&id_priv->handler_mutex);
2760 if (READ_ONCE(id_priv->state) == RDMA_CM_DESTROYING ||
2761 READ_ONCE(id_priv->state) == RDMA_CM_DEVICE_REMOVAL)
2762 goto out_unlock;
2763 if (work->old_state != 0 || work->new_state != 0) {
2764 if (!cma_comp_exch(id_priv, work->old_state, work->new_state))
2765 goto out_unlock;
2766 }
2767
2768 if (cma_cm_event_handler(id_priv, &work->event)) {
2769 cma_id_put(id_priv);
2770 destroy_id_handler_unlock(id_priv);
2771 goto out_free;
2772 }
2773
2774 out_unlock:
2775 mutex_unlock(&id_priv->handler_mutex);
2776 cma_id_put(id_priv);
2777 out_free:
2778 if (work->event.event == RDMA_CM_EVENT_MULTICAST_JOIN)
2779 rdma_destroy_ah_attr(&work->event.param.ud.ah_attr);
2780 kfree(work);
2781 }
2782
cma_init_resolve_route_work(struct cma_work * work,struct rdma_id_private * id_priv)2783 static void cma_init_resolve_route_work(struct cma_work *work,
2784 struct rdma_id_private *id_priv)
2785 {
2786 work->id = id_priv;
2787 INIT_WORK(&work->work, cma_work_handler);
2788 work->old_state = RDMA_CM_ROUTE_QUERY;
2789 work->new_state = RDMA_CM_ROUTE_RESOLVED;
2790 work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
2791 }
2792
enqueue_resolve_addr_work(struct cma_work * work,struct rdma_id_private * id_priv)2793 static void enqueue_resolve_addr_work(struct cma_work *work,
2794 struct rdma_id_private *id_priv)
2795 {
2796 /* Balances with cma_id_put() in cma_work_handler */
2797 cma_id_get(id_priv);
2798
2799 work->id = id_priv;
2800 INIT_WORK(&work->work, cma_work_handler);
2801 work->old_state = RDMA_CM_ADDR_QUERY;
2802 work->new_state = RDMA_CM_ADDR_RESOLVED;
2803 work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
2804
2805 queue_work(cma_wq, &work->work);
2806 }
2807
cma_resolve_ib_route(struct rdma_id_private * id_priv,unsigned long timeout_ms)2808 static int cma_resolve_ib_route(struct rdma_id_private *id_priv,
2809 unsigned long timeout_ms)
2810 {
2811 struct rdma_route *route = &id_priv->id.route;
2812 struct cma_work *work;
2813 int ret;
2814
2815 work = kzalloc(sizeof *work, GFP_KERNEL);
2816 if (!work)
2817 return -ENOMEM;
2818
2819 cma_init_resolve_route_work(work, id_priv);
2820
2821 route->path_rec = kmalloc(sizeof *route->path_rec, GFP_KERNEL);
2822 if (!route->path_rec) {
2823 ret = -ENOMEM;
2824 goto err1;
2825 }
2826
2827 ret = cma_query_ib_route(id_priv, timeout_ms, work);
2828 if (ret)
2829 goto err2;
2830
2831 return 0;
2832 err2:
2833 kfree(route->path_rec);
2834 route->path_rec = NULL;
2835 err1:
2836 kfree(work);
2837 return ret;
2838 }
2839
cma_route_gid_type(enum rdma_network_type network_type,unsigned long supported_gids,enum ib_gid_type default_gid)2840 static enum ib_gid_type cma_route_gid_type(enum rdma_network_type network_type,
2841 unsigned long supported_gids,
2842 enum ib_gid_type default_gid)
2843 {
2844 if ((network_type == RDMA_NETWORK_IPV4 ||
2845 network_type == RDMA_NETWORK_IPV6) &&
2846 test_bit(IB_GID_TYPE_ROCE_UDP_ENCAP, &supported_gids))
2847 return IB_GID_TYPE_ROCE_UDP_ENCAP;
2848
2849 return default_gid;
2850 }
2851
2852 /*
2853 * cma_iboe_set_path_rec_l2_fields() is helper function which sets
2854 * path record type based on GID type.
2855 * It also sets up other L2 fields which includes destination mac address
2856 * netdev ifindex, of the path record.
2857 * It returns the netdev of the bound interface for this path record entry.
2858 */
2859 static struct net_device *
cma_iboe_set_path_rec_l2_fields(struct rdma_id_private * id_priv)2860 cma_iboe_set_path_rec_l2_fields(struct rdma_id_private *id_priv)
2861 {
2862 struct rdma_route *route = &id_priv->id.route;
2863 enum ib_gid_type gid_type = IB_GID_TYPE_ROCE;
2864 struct rdma_addr *addr = &route->addr;
2865 unsigned long supported_gids;
2866 struct net_device *ndev;
2867
2868 if (!addr->dev_addr.bound_dev_if)
2869 return NULL;
2870
2871 ndev = dev_get_by_index(addr->dev_addr.net,
2872 addr->dev_addr.bound_dev_if);
2873 if (!ndev)
2874 return NULL;
2875
2876 supported_gids = roce_gid_type_mask_support(id_priv->id.device,
2877 id_priv->id.port_num);
2878 gid_type = cma_route_gid_type(addr->dev_addr.network,
2879 supported_gids,
2880 id_priv->gid_type);
2881 /* Use the hint from IP Stack to select GID Type */
2882 if (gid_type < ib_network_to_gid_type(addr->dev_addr.network))
2883 gid_type = ib_network_to_gid_type(addr->dev_addr.network);
2884 route->path_rec->rec_type = sa_conv_gid_to_pathrec_type(gid_type);
2885
2886 route->path_rec->roce.route_resolved = true;
2887 sa_path_set_dmac(route->path_rec, addr->dev_addr.dst_dev_addr);
2888 return ndev;
2889 }
2890
rdma_set_ib_path(struct rdma_cm_id * id,struct sa_path_rec * path_rec)2891 int rdma_set_ib_path(struct rdma_cm_id *id,
2892 struct sa_path_rec *path_rec)
2893 {
2894 struct rdma_id_private *id_priv;
2895 struct net_device *ndev;
2896 int ret;
2897
2898 id_priv = container_of(id, struct rdma_id_private, id);
2899 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED,
2900 RDMA_CM_ROUTE_RESOLVED))
2901 return -EINVAL;
2902
2903 id->route.path_rec = kmemdup(path_rec, sizeof(*path_rec),
2904 GFP_KERNEL);
2905 if (!id->route.path_rec) {
2906 ret = -ENOMEM;
2907 goto err;
2908 }
2909
2910 if (rdma_protocol_roce(id->device, id->port_num)) {
2911 ndev = cma_iboe_set_path_rec_l2_fields(id_priv);
2912 if (!ndev) {
2913 ret = -ENODEV;
2914 goto err_free;
2915 }
2916 dev_put(ndev);
2917 }
2918
2919 id->route.num_paths = 1;
2920 return 0;
2921
2922 err_free:
2923 kfree(id->route.path_rec);
2924 id->route.path_rec = NULL;
2925 err:
2926 cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_ADDR_RESOLVED);
2927 return ret;
2928 }
2929 EXPORT_SYMBOL(rdma_set_ib_path);
2930
cma_resolve_iw_route(struct rdma_id_private * id_priv)2931 static int cma_resolve_iw_route(struct rdma_id_private *id_priv)
2932 {
2933 struct cma_work *work;
2934
2935 work = kzalloc(sizeof *work, GFP_KERNEL);
2936 if (!work)
2937 return -ENOMEM;
2938
2939 cma_init_resolve_route_work(work, id_priv);
2940 queue_work(cma_wq, &work->work);
2941 return 0;
2942 }
2943
get_vlan_ndev_tc(struct net_device * vlan_ndev,int prio)2944 static int get_vlan_ndev_tc(struct net_device *vlan_ndev, int prio)
2945 {
2946 struct net_device *dev;
2947
2948 dev = vlan_dev_real_dev(vlan_ndev);
2949 if (dev->num_tc)
2950 return netdev_get_prio_tc_map(dev, prio);
2951
2952 return (vlan_dev_get_egress_qos_mask(vlan_ndev, prio) &
2953 VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
2954 }
2955
2956 struct iboe_prio_tc_map {
2957 int input_prio;
2958 int output_tc;
2959 bool found;
2960 };
2961
get_lower_vlan_dev_tc(struct net_device * dev,struct netdev_nested_priv * priv)2962 static int get_lower_vlan_dev_tc(struct net_device *dev,
2963 struct netdev_nested_priv *priv)
2964 {
2965 struct iboe_prio_tc_map *map = (struct iboe_prio_tc_map *)priv->data;
2966
2967 if (is_vlan_dev(dev))
2968 map->output_tc = get_vlan_ndev_tc(dev, map->input_prio);
2969 else if (dev->num_tc)
2970 map->output_tc = netdev_get_prio_tc_map(dev, map->input_prio);
2971 else
2972 map->output_tc = 0;
2973 /* We are interested only in first level VLAN device, so always
2974 * return 1 to stop iterating over next level devices.
2975 */
2976 map->found = true;
2977 return 1;
2978 }
2979
iboe_tos_to_sl(struct net_device * ndev,int tos)2980 static int iboe_tos_to_sl(struct net_device *ndev, int tos)
2981 {
2982 struct iboe_prio_tc_map prio_tc_map = {};
2983 int prio = rt_tos2priority(tos);
2984 struct netdev_nested_priv priv;
2985
2986 /* If VLAN device, get it directly from the VLAN netdev */
2987 if (is_vlan_dev(ndev))
2988 return get_vlan_ndev_tc(ndev, prio);
2989
2990 prio_tc_map.input_prio = prio;
2991 priv.data = (void *)&prio_tc_map;
2992 rcu_read_lock();
2993 netdev_walk_all_lower_dev_rcu(ndev,
2994 get_lower_vlan_dev_tc,
2995 &priv);
2996 rcu_read_unlock();
2997 /* If map is found from lower device, use it; Otherwise
2998 * continue with the current netdevice to get priority to tc map.
2999 */
3000 if (prio_tc_map.found)
3001 return prio_tc_map.output_tc;
3002 else if (ndev->num_tc)
3003 return netdev_get_prio_tc_map(ndev, prio);
3004 else
3005 return 0;
3006 }
3007
cma_get_roce_udp_flow_label(struct rdma_id_private * id_priv)3008 static __be32 cma_get_roce_udp_flow_label(struct rdma_id_private *id_priv)
3009 {
3010 struct sockaddr_in6 *addr6;
3011 u16 dport, sport;
3012 u32 hash, fl;
3013
3014 addr6 = (struct sockaddr_in6 *)cma_src_addr(id_priv);
3015 fl = be32_to_cpu(addr6->sin6_flowinfo) & IB_GRH_FLOWLABEL_MASK;
3016 if ((cma_family(id_priv) != AF_INET6) || !fl) {
3017 dport = be16_to_cpu(cma_port(cma_dst_addr(id_priv)));
3018 sport = be16_to_cpu(cma_port(cma_src_addr(id_priv)));
3019 hash = (u32)sport * 31 + dport;
3020 fl = hash & IB_GRH_FLOWLABEL_MASK;
3021 }
3022
3023 return cpu_to_be32(fl);
3024 }
3025
cma_resolve_iboe_route(struct rdma_id_private * id_priv)3026 static int cma_resolve_iboe_route(struct rdma_id_private *id_priv)
3027 {
3028 struct rdma_route *route = &id_priv->id.route;
3029 struct rdma_addr *addr = &route->addr;
3030 struct cma_work *work;
3031 int ret;
3032 struct net_device *ndev;
3033
3034 u8 default_roce_tos = id_priv->cma_dev->default_roce_tos[id_priv->id.port_num -
3035 rdma_start_port(id_priv->cma_dev->device)];
3036 u8 tos = id_priv->tos_set ? id_priv->tos : default_roce_tos;
3037
3038
3039 work = kzalloc(sizeof *work, GFP_KERNEL);
3040 if (!work)
3041 return -ENOMEM;
3042
3043 route->path_rec = kzalloc(sizeof *route->path_rec, GFP_KERNEL);
3044 if (!route->path_rec) {
3045 ret = -ENOMEM;
3046 goto err1;
3047 }
3048
3049 route->num_paths = 1;
3050
3051 ndev = cma_iboe_set_path_rec_l2_fields(id_priv);
3052 if (!ndev) {
3053 ret = -ENODEV;
3054 goto err2;
3055 }
3056
3057 rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
3058 &route->path_rec->sgid);
3059 rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.dst_addr,
3060 &route->path_rec->dgid);
3061
3062 if (((struct sockaddr *)&id_priv->id.route.addr.dst_addr)->sa_family != AF_IB)
3063 /* TODO: get the hoplimit from the inet/inet6 device */
3064 route->path_rec->hop_limit = addr->dev_addr.hoplimit;
3065 else
3066 route->path_rec->hop_limit = 1;
3067 route->path_rec->reversible = 1;
3068 route->path_rec->pkey = cpu_to_be16(0xffff);
3069 route->path_rec->mtu_selector = IB_SA_EQ;
3070 route->path_rec->sl = iboe_tos_to_sl(ndev, tos);
3071 route->path_rec->traffic_class = tos;
3072 route->path_rec->mtu = iboe_get_mtu(ndev->mtu);
3073 route->path_rec->rate_selector = IB_SA_EQ;
3074 route->path_rec->rate = iboe_get_rate(ndev);
3075 dev_put(ndev);
3076 route->path_rec->packet_life_time_selector = IB_SA_EQ;
3077 /* In case ACK timeout is set, use this value to calculate
3078 * PacketLifeTime. As per IBTA 12.7.34,
3079 * local ACK timeout = (2 * PacketLifeTime + Local CA’s ACK delay).
3080 * Assuming a negligible local ACK delay, we can use
3081 * PacketLifeTime = local ACK timeout/2
3082 * as a reasonable approximation for RoCE networks.
3083 */
3084 route->path_rec->packet_life_time = id_priv->timeout_set ?
3085 id_priv->timeout - 1 : CMA_IBOE_PACKET_LIFETIME;
3086
3087 if (!route->path_rec->mtu) {
3088 ret = -EINVAL;
3089 goto err2;
3090 }
3091
3092 if (rdma_protocol_roce_udp_encap(id_priv->id.device,
3093 id_priv->id.port_num))
3094 route->path_rec->flow_label =
3095 cma_get_roce_udp_flow_label(id_priv);
3096
3097 cma_init_resolve_route_work(work, id_priv);
3098 queue_work(cma_wq, &work->work);
3099
3100 return 0;
3101
3102 err2:
3103 kfree(route->path_rec);
3104 route->path_rec = NULL;
3105 route->num_paths = 0;
3106 err1:
3107 kfree(work);
3108 return ret;
3109 }
3110
rdma_resolve_route(struct rdma_cm_id * id,unsigned long timeout_ms)3111 int rdma_resolve_route(struct rdma_cm_id *id, unsigned long timeout_ms)
3112 {
3113 struct rdma_id_private *id_priv;
3114 int ret;
3115
3116 id_priv = container_of(id, struct rdma_id_private, id);
3117 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED, RDMA_CM_ROUTE_QUERY))
3118 return -EINVAL;
3119
3120 cma_id_get(id_priv);
3121 if (rdma_cap_ib_sa(id->device, id->port_num))
3122 ret = cma_resolve_ib_route(id_priv, timeout_ms);
3123 else if (rdma_protocol_roce(id->device, id->port_num))
3124 ret = cma_resolve_iboe_route(id_priv);
3125 else if (rdma_protocol_iwarp(id->device, id->port_num))
3126 ret = cma_resolve_iw_route(id_priv);
3127 else
3128 ret = -ENOSYS;
3129
3130 if (ret)
3131 goto err;
3132
3133 return 0;
3134 err:
3135 cma_comp_exch(id_priv, RDMA_CM_ROUTE_QUERY, RDMA_CM_ADDR_RESOLVED);
3136 cma_id_put(id_priv);
3137 return ret;
3138 }
3139 EXPORT_SYMBOL(rdma_resolve_route);
3140
cma_set_loopback(struct sockaddr * addr)3141 static void cma_set_loopback(struct sockaddr *addr)
3142 {
3143 switch (addr->sa_family) {
3144 case AF_INET:
3145 ((struct sockaddr_in *) addr)->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
3146 break;
3147 case AF_INET6:
3148 ipv6_addr_set(&((struct sockaddr_in6 *) addr)->sin6_addr,
3149 0, 0, 0, htonl(1));
3150 break;
3151 default:
3152 ib_addr_set(&((struct sockaddr_ib *) addr)->sib_addr,
3153 0, 0, 0, htonl(1));
3154 break;
3155 }
3156 }
3157
cma_bind_loopback(struct rdma_id_private * id_priv)3158 static int cma_bind_loopback(struct rdma_id_private *id_priv)
3159 {
3160 struct cma_device *cma_dev, *cur_dev;
3161 union ib_gid gid;
3162 enum ib_port_state port_state;
3163 unsigned int p;
3164 u16 pkey;
3165 int ret;
3166
3167 cma_dev = NULL;
3168 mutex_lock(&lock);
3169 list_for_each_entry(cur_dev, &dev_list, list) {
3170 if (cma_family(id_priv) == AF_IB &&
3171 !rdma_cap_ib_cm(cur_dev->device, 1))
3172 continue;
3173
3174 if (!cma_dev)
3175 cma_dev = cur_dev;
3176
3177 rdma_for_each_port (cur_dev->device, p) {
3178 if (!ib_get_cached_port_state(cur_dev->device, p, &port_state) &&
3179 port_state == IB_PORT_ACTIVE) {
3180 cma_dev = cur_dev;
3181 goto port_found;
3182 }
3183 }
3184 }
3185
3186 if (!cma_dev) {
3187 ret = -ENODEV;
3188 goto out;
3189 }
3190
3191 p = 1;
3192
3193 port_found:
3194 ret = rdma_query_gid(cma_dev->device, p, 0, &gid);
3195 if (ret)
3196 goto out;
3197
3198 ret = ib_get_cached_pkey(cma_dev->device, p, 0, &pkey);
3199 if (ret)
3200 goto out;
3201
3202 id_priv->id.route.addr.dev_addr.dev_type =
3203 (rdma_protocol_ib(cma_dev->device, p)) ?
3204 ARPHRD_INFINIBAND : ARPHRD_ETHER;
3205
3206 rdma_addr_set_sgid(&id_priv->id.route.addr.dev_addr, &gid);
3207 ib_addr_set_pkey(&id_priv->id.route.addr.dev_addr, pkey);
3208 id_priv->id.port_num = p;
3209 cma_attach_to_dev(id_priv, cma_dev);
3210 rdma_restrack_add(&id_priv->res);
3211 cma_set_loopback(cma_src_addr(id_priv));
3212 out:
3213 mutex_unlock(&lock);
3214 return ret;
3215 }
3216
addr_handler(int status,struct sockaddr * src_addr,struct rdma_dev_addr * dev_addr,void * context)3217 static void addr_handler(int status, struct sockaddr *src_addr,
3218 struct rdma_dev_addr *dev_addr, void *context)
3219 {
3220 struct rdma_id_private *id_priv = context;
3221 struct rdma_cm_event event = {};
3222 struct sockaddr *addr;
3223 struct sockaddr_storage old_addr;
3224
3225 mutex_lock(&id_priv->handler_mutex);
3226 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY,
3227 RDMA_CM_ADDR_RESOLVED))
3228 goto out;
3229
3230 /*
3231 * Store the previous src address, so that if we fail to acquire
3232 * matching rdma device, old address can be restored back, which helps
3233 * to cancel the cma listen operation correctly.
3234 */
3235 addr = cma_src_addr(id_priv);
3236 memcpy(&old_addr, addr, rdma_addr_size(addr));
3237 memcpy(addr, src_addr, rdma_addr_size(src_addr));
3238 if (!status && !id_priv->cma_dev) {
3239 status = cma_acquire_dev_by_src_ip(id_priv);
3240 if (status)
3241 pr_debug_ratelimited("RDMA CM: ADDR_ERROR: failed to acquire device. status %d\n",
3242 status);
3243 rdma_restrack_add(&id_priv->res);
3244 } else if (status) {
3245 pr_debug_ratelimited("RDMA CM: ADDR_ERROR: failed to resolve IP. status %d\n", status);
3246 }
3247
3248 if (status) {
3249 memcpy(addr, &old_addr,
3250 rdma_addr_size((struct sockaddr *)&old_addr));
3251 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED,
3252 RDMA_CM_ADDR_BOUND))
3253 goto out;
3254 event.event = RDMA_CM_EVENT_ADDR_ERROR;
3255 event.status = status;
3256 } else
3257 event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
3258
3259 if (cma_cm_event_handler(id_priv, &event)) {
3260 destroy_id_handler_unlock(id_priv);
3261 return;
3262 }
3263 out:
3264 mutex_unlock(&id_priv->handler_mutex);
3265 }
3266
cma_resolve_loopback(struct rdma_id_private * id_priv)3267 static int cma_resolve_loopback(struct rdma_id_private *id_priv)
3268 {
3269 struct cma_work *work;
3270 union ib_gid gid;
3271 int ret;
3272
3273 work = kzalloc(sizeof *work, GFP_KERNEL);
3274 if (!work)
3275 return -ENOMEM;
3276
3277 if (!id_priv->cma_dev) {
3278 ret = cma_bind_loopback(id_priv);
3279 if (ret)
3280 goto err;
3281 }
3282
3283 rdma_addr_get_sgid(&id_priv->id.route.addr.dev_addr, &gid);
3284 rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, &gid);
3285
3286 enqueue_resolve_addr_work(work, id_priv);
3287 return 0;
3288 err:
3289 kfree(work);
3290 return ret;
3291 }
3292
cma_resolve_ib_addr(struct rdma_id_private * id_priv)3293 static int cma_resolve_ib_addr(struct rdma_id_private *id_priv)
3294 {
3295 struct cma_work *work;
3296 int ret;
3297
3298 work = kzalloc(sizeof *work, GFP_KERNEL);
3299 if (!work)
3300 return -ENOMEM;
3301
3302 if (!id_priv->cma_dev) {
3303 ret = cma_resolve_ib_dev(id_priv);
3304 if (ret)
3305 goto err;
3306 }
3307
3308 rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, (union ib_gid *)
3309 &(((struct sockaddr_ib *) &id_priv->id.route.addr.dst_addr)->sib_addr));
3310
3311 enqueue_resolve_addr_work(work, id_priv);
3312 return 0;
3313 err:
3314 kfree(work);
3315 return ret;
3316 }
3317
cma_bind_addr(struct rdma_cm_id * id,struct sockaddr * src_addr,const struct sockaddr * dst_addr)3318 static int cma_bind_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
3319 const struct sockaddr *dst_addr)
3320 {
3321 if (!src_addr || !src_addr->sa_family) {
3322 src_addr = (struct sockaddr *) &id->route.addr.src_addr;
3323 src_addr->sa_family = dst_addr->sa_family;
3324 if (IS_ENABLED(CONFIG_IPV6) &&
3325 dst_addr->sa_family == AF_INET6) {
3326 struct sockaddr_in6 *src_addr6 = (struct sockaddr_in6 *) src_addr;
3327 struct sockaddr_in6 *dst_addr6 = (struct sockaddr_in6 *) dst_addr;
3328 src_addr6->sin6_scope_id = dst_addr6->sin6_scope_id;
3329 if (ipv6_addr_type(&dst_addr6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
3330 id->route.addr.dev_addr.bound_dev_if = dst_addr6->sin6_scope_id;
3331 } else if (dst_addr->sa_family == AF_IB) {
3332 ((struct sockaddr_ib *) src_addr)->sib_pkey =
3333 ((struct sockaddr_ib *) dst_addr)->sib_pkey;
3334 }
3335 }
3336 return rdma_bind_addr(id, src_addr);
3337 }
3338
3339 /*
3340 * If required, resolve the source address for bind and leave the id_priv in
3341 * state RDMA_CM_ADDR_BOUND. This oddly uses the state to determine the prior
3342 * calls made by ULP, a previously bound ID will not be re-bound and src_addr is
3343 * ignored.
3344 */
resolve_prepare_src(struct rdma_id_private * id_priv,struct sockaddr * src_addr,const struct sockaddr * dst_addr)3345 static int resolve_prepare_src(struct rdma_id_private *id_priv,
3346 struct sockaddr *src_addr,
3347 const struct sockaddr *dst_addr)
3348 {
3349 int ret;
3350
3351 memcpy(cma_dst_addr(id_priv), dst_addr, rdma_addr_size(dst_addr));
3352 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_ADDR_QUERY)) {
3353 /* For a well behaved ULP state will be RDMA_CM_IDLE */
3354 ret = cma_bind_addr(&id_priv->id, src_addr, dst_addr);
3355 if (ret)
3356 goto err_dst;
3357 if (WARN_ON(!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND,
3358 RDMA_CM_ADDR_QUERY))) {
3359 ret = -EINVAL;
3360 goto err_dst;
3361 }
3362 }
3363
3364 if (cma_family(id_priv) != dst_addr->sa_family) {
3365 ret = -EINVAL;
3366 goto err_state;
3367 }
3368 return 0;
3369
3370 err_state:
3371 cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY, RDMA_CM_ADDR_BOUND);
3372 err_dst:
3373 memset(cma_dst_addr(id_priv), 0, rdma_addr_size(dst_addr));
3374 return ret;
3375 }
3376
rdma_resolve_addr(struct rdma_cm_id * id,struct sockaddr * src_addr,const struct sockaddr * dst_addr,unsigned long timeout_ms)3377 int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
3378 const struct sockaddr *dst_addr, unsigned long timeout_ms)
3379 {
3380 struct rdma_id_private *id_priv =
3381 container_of(id, struct rdma_id_private, id);
3382 int ret;
3383
3384 ret = resolve_prepare_src(id_priv, src_addr, dst_addr);
3385 if (ret)
3386 return ret;
3387
3388 if (cma_any_addr(dst_addr)) {
3389 ret = cma_resolve_loopback(id_priv);
3390 } else {
3391 if (dst_addr->sa_family == AF_IB) {
3392 ret = cma_resolve_ib_addr(id_priv);
3393 } else {
3394 ret = rdma_resolve_ip(cma_src_addr(id_priv), dst_addr,
3395 &id->route.addr.dev_addr,
3396 timeout_ms, addr_handler,
3397 false, id_priv);
3398 }
3399 }
3400 if (ret)
3401 goto err;
3402
3403 return 0;
3404 err:
3405 cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY, RDMA_CM_ADDR_BOUND);
3406 return ret;
3407 }
3408 EXPORT_SYMBOL(rdma_resolve_addr);
3409
rdma_set_reuseaddr(struct rdma_cm_id * id,int reuse)3410 int rdma_set_reuseaddr(struct rdma_cm_id *id, int reuse)
3411 {
3412 struct rdma_id_private *id_priv;
3413 unsigned long flags;
3414 int ret;
3415
3416 id_priv = container_of(id, struct rdma_id_private, id);
3417 spin_lock_irqsave(&id_priv->lock, flags);
3418 if ((reuse && id_priv->state != RDMA_CM_LISTEN) ||
3419 id_priv->state == RDMA_CM_IDLE) {
3420 id_priv->reuseaddr = reuse;
3421 ret = 0;
3422 } else {
3423 ret = -EINVAL;
3424 }
3425 spin_unlock_irqrestore(&id_priv->lock, flags);
3426 return ret;
3427 }
3428 EXPORT_SYMBOL(rdma_set_reuseaddr);
3429
rdma_set_afonly(struct rdma_cm_id * id,int afonly)3430 int rdma_set_afonly(struct rdma_cm_id *id, int afonly)
3431 {
3432 struct rdma_id_private *id_priv;
3433 unsigned long flags;
3434 int ret;
3435
3436 id_priv = container_of(id, struct rdma_id_private, id);
3437 spin_lock_irqsave(&id_priv->lock, flags);
3438 if (id_priv->state == RDMA_CM_IDLE || id_priv->state == RDMA_CM_ADDR_BOUND) {
3439 id_priv->options |= (1 << CMA_OPTION_AFONLY);
3440 id_priv->afonly = afonly;
3441 ret = 0;
3442 } else {
3443 ret = -EINVAL;
3444 }
3445 spin_unlock_irqrestore(&id_priv->lock, flags);
3446 return ret;
3447 }
3448 EXPORT_SYMBOL(rdma_set_afonly);
3449
cma_bind_port(struct rdma_bind_list * bind_list,struct rdma_id_private * id_priv)3450 static void cma_bind_port(struct rdma_bind_list *bind_list,
3451 struct rdma_id_private *id_priv)
3452 {
3453 struct sockaddr *addr;
3454 struct sockaddr_ib *sib;
3455 u64 sid, mask;
3456 __be16 port;
3457
3458 lockdep_assert_held(&lock);
3459
3460 addr = cma_src_addr(id_priv);
3461 port = htons(bind_list->port);
3462
3463 switch (addr->sa_family) {
3464 case AF_INET:
3465 ((struct sockaddr_in *) addr)->sin_port = port;
3466 break;
3467 case AF_INET6:
3468 ((struct sockaddr_in6 *) addr)->sin6_port = port;
3469 break;
3470 case AF_IB:
3471 sib = (struct sockaddr_ib *) addr;
3472 sid = be64_to_cpu(sib->sib_sid);
3473 mask = be64_to_cpu(sib->sib_sid_mask);
3474 sib->sib_sid = cpu_to_be64((sid & mask) | (u64) ntohs(port));
3475 sib->sib_sid_mask = cpu_to_be64(~0ULL);
3476 break;
3477 }
3478 id_priv->bind_list = bind_list;
3479 hlist_add_head(&id_priv->node, &bind_list->owners);
3480 }
3481
cma_alloc_port(enum rdma_ucm_port_space ps,struct rdma_id_private * id_priv,unsigned short snum)3482 static int cma_alloc_port(enum rdma_ucm_port_space ps,
3483 struct rdma_id_private *id_priv, unsigned short snum)
3484 {
3485 struct rdma_bind_list *bind_list;
3486 int ret;
3487
3488 lockdep_assert_held(&lock);
3489
3490 bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL);
3491 if (!bind_list)
3492 return -ENOMEM;
3493
3494 ret = cma_ps_alloc(id_priv->id.route.addr.dev_addr.net, ps, bind_list,
3495 snum);
3496 if (ret < 0)
3497 goto err;
3498
3499 bind_list->ps = ps;
3500 bind_list->port = snum;
3501 cma_bind_port(bind_list, id_priv);
3502 return 0;
3503 err:
3504 kfree(bind_list);
3505 return ret == -ENOSPC ? -EADDRNOTAVAIL : ret;
3506 }
3507
cma_port_is_unique(struct rdma_bind_list * bind_list,struct rdma_id_private * id_priv)3508 static int cma_port_is_unique(struct rdma_bind_list *bind_list,
3509 struct rdma_id_private *id_priv)
3510 {
3511 struct rdma_id_private *cur_id;
3512 struct sockaddr *daddr = cma_dst_addr(id_priv);
3513 struct sockaddr *saddr = cma_src_addr(id_priv);
3514 __be16 dport = cma_port(daddr);
3515
3516 lockdep_assert_held(&lock);
3517
3518 hlist_for_each_entry(cur_id, &bind_list->owners, node) {
3519 struct sockaddr *cur_daddr = cma_dst_addr(cur_id);
3520 struct sockaddr *cur_saddr = cma_src_addr(cur_id);
3521 __be16 cur_dport = cma_port(cur_daddr);
3522
3523 if (id_priv == cur_id)
3524 continue;
3525
3526 /* different dest port -> unique */
3527 if (!cma_any_port(daddr) &&
3528 !cma_any_port(cur_daddr) &&
3529 (dport != cur_dport))
3530 continue;
3531
3532 /* different src address -> unique */
3533 if (!cma_any_addr(saddr) &&
3534 !cma_any_addr(cur_saddr) &&
3535 cma_addr_cmp(saddr, cur_saddr))
3536 continue;
3537
3538 /* different dst address -> unique */
3539 if (!cma_any_addr(daddr) &&
3540 !cma_any_addr(cur_daddr) &&
3541 cma_addr_cmp(daddr, cur_daddr))
3542 continue;
3543
3544 return -EADDRNOTAVAIL;
3545 }
3546 return 0;
3547 }
3548
cma_alloc_any_port(enum rdma_ucm_port_space ps,struct rdma_id_private * id_priv)3549 static int cma_alloc_any_port(enum rdma_ucm_port_space ps,
3550 struct rdma_id_private *id_priv)
3551 {
3552 static unsigned int last_used_port;
3553 int low, high, remaining;
3554 unsigned int rover;
3555 struct net *net = id_priv->id.route.addr.dev_addr.net;
3556
3557 lockdep_assert_held(&lock);
3558
3559 inet_get_local_port_range(net, &low, &high);
3560 remaining = (high - low) + 1;
3561 rover = prandom_u32() % remaining + low;
3562 retry:
3563 if (last_used_port != rover) {
3564 struct rdma_bind_list *bind_list;
3565 int ret;
3566
3567 bind_list = cma_ps_find(net, ps, (unsigned short)rover);
3568
3569 if (!bind_list) {
3570 ret = cma_alloc_port(ps, id_priv, rover);
3571 } else {
3572 ret = cma_port_is_unique(bind_list, id_priv);
3573 if (!ret)
3574 cma_bind_port(bind_list, id_priv);
3575 }
3576 /*
3577 * Remember previously used port number in order to avoid
3578 * re-using same port immediately after it is closed.
3579 */
3580 if (!ret)
3581 last_used_port = rover;
3582 if (ret != -EADDRNOTAVAIL)
3583 return ret;
3584 }
3585 if (--remaining) {
3586 rover++;
3587 if ((rover < low) || (rover > high))
3588 rover = low;
3589 goto retry;
3590 }
3591 return -EADDRNOTAVAIL;
3592 }
3593
3594 /*
3595 * Check that the requested port is available. This is called when trying to
3596 * bind to a specific port, or when trying to listen on a bound port. In
3597 * the latter case, the provided id_priv may already be on the bind_list, but
3598 * we still need to check that it's okay to start listening.
3599 */
cma_check_port(struct rdma_bind_list * bind_list,struct rdma_id_private * id_priv,uint8_t reuseaddr)3600 static int cma_check_port(struct rdma_bind_list *bind_list,
3601 struct rdma_id_private *id_priv, uint8_t reuseaddr)
3602 {
3603 struct rdma_id_private *cur_id;
3604 struct sockaddr *addr, *cur_addr;
3605
3606 lockdep_assert_held(&lock);
3607
3608 addr = cma_src_addr(id_priv);
3609 hlist_for_each_entry(cur_id, &bind_list->owners, node) {
3610 if (id_priv == cur_id)
3611 continue;
3612
3613 if (reuseaddr && cur_id->reuseaddr)
3614 continue;
3615
3616 cur_addr = cma_src_addr(cur_id);
3617 if (id_priv->afonly && cur_id->afonly &&
3618 (addr->sa_family != cur_addr->sa_family))
3619 continue;
3620
3621 if (cma_any_addr(addr) || cma_any_addr(cur_addr))
3622 return -EADDRNOTAVAIL;
3623
3624 if (!cma_addr_cmp(addr, cur_addr))
3625 return -EADDRINUSE;
3626 }
3627 return 0;
3628 }
3629
cma_use_port(enum rdma_ucm_port_space ps,struct rdma_id_private * id_priv)3630 static int cma_use_port(enum rdma_ucm_port_space ps,
3631 struct rdma_id_private *id_priv)
3632 {
3633 struct rdma_bind_list *bind_list;
3634 unsigned short snum;
3635 int ret;
3636
3637 lockdep_assert_held(&lock);
3638
3639 snum = ntohs(cma_port(cma_src_addr(id_priv)));
3640 if (snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
3641 return -EACCES;
3642
3643 bind_list = cma_ps_find(id_priv->id.route.addr.dev_addr.net, ps, snum);
3644 if (!bind_list) {
3645 ret = cma_alloc_port(ps, id_priv, snum);
3646 } else {
3647 ret = cma_check_port(bind_list, id_priv, id_priv->reuseaddr);
3648 if (!ret)
3649 cma_bind_port(bind_list, id_priv);
3650 }
3651 return ret;
3652 }
3653
3654 static enum rdma_ucm_port_space
cma_select_inet_ps(struct rdma_id_private * id_priv)3655 cma_select_inet_ps(struct rdma_id_private *id_priv)
3656 {
3657 switch (id_priv->id.ps) {
3658 case RDMA_PS_TCP:
3659 case RDMA_PS_UDP:
3660 case RDMA_PS_IPOIB:
3661 case RDMA_PS_IB:
3662 return id_priv->id.ps;
3663 default:
3664
3665 return 0;
3666 }
3667 }
3668
3669 static enum rdma_ucm_port_space
cma_select_ib_ps(struct rdma_id_private * id_priv)3670 cma_select_ib_ps(struct rdma_id_private *id_priv)
3671 {
3672 enum rdma_ucm_port_space ps = 0;
3673 struct sockaddr_ib *sib;
3674 u64 sid_ps, mask, sid;
3675
3676 sib = (struct sockaddr_ib *) cma_src_addr(id_priv);
3677 mask = be64_to_cpu(sib->sib_sid_mask) & RDMA_IB_IP_PS_MASK;
3678 sid = be64_to_cpu(sib->sib_sid) & mask;
3679
3680 if ((id_priv->id.ps == RDMA_PS_IB) && (sid == (RDMA_IB_IP_PS_IB & mask))) {
3681 sid_ps = RDMA_IB_IP_PS_IB;
3682 ps = RDMA_PS_IB;
3683 } else if (((id_priv->id.ps == RDMA_PS_IB) || (id_priv->id.ps == RDMA_PS_TCP)) &&
3684 (sid == (RDMA_IB_IP_PS_TCP & mask))) {
3685 sid_ps = RDMA_IB_IP_PS_TCP;
3686 ps = RDMA_PS_TCP;
3687 } else if (((id_priv->id.ps == RDMA_PS_IB) || (id_priv->id.ps == RDMA_PS_UDP)) &&
3688 (sid == (RDMA_IB_IP_PS_UDP & mask))) {
3689 sid_ps = RDMA_IB_IP_PS_UDP;
3690 ps = RDMA_PS_UDP;
3691 }
3692
3693 if (ps) {
3694 sib->sib_sid = cpu_to_be64(sid_ps | ntohs(cma_port((struct sockaddr *) sib)));
3695 sib->sib_sid_mask = cpu_to_be64(RDMA_IB_IP_PS_MASK |
3696 be64_to_cpu(sib->sib_sid_mask));
3697 }
3698 return ps;
3699 }
3700
cma_get_port(struct rdma_id_private * id_priv)3701 static int cma_get_port(struct rdma_id_private *id_priv)
3702 {
3703 enum rdma_ucm_port_space ps;
3704 int ret;
3705
3706 if (cma_family(id_priv) != AF_IB)
3707 ps = cma_select_inet_ps(id_priv);
3708 else
3709 ps = cma_select_ib_ps(id_priv);
3710 if (!ps)
3711 return -EPROTONOSUPPORT;
3712
3713 mutex_lock(&lock);
3714 if (cma_any_port(cma_src_addr(id_priv)))
3715 ret = cma_alloc_any_port(ps, id_priv);
3716 else
3717 ret = cma_use_port(ps, id_priv);
3718 mutex_unlock(&lock);
3719
3720 return ret;
3721 }
3722
cma_check_linklocal(struct rdma_dev_addr * dev_addr,struct sockaddr * addr)3723 static int cma_check_linklocal(struct rdma_dev_addr *dev_addr,
3724 struct sockaddr *addr)
3725 {
3726 #if IS_ENABLED(CONFIG_IPV6)
3727 struct sockaddr_in6 *sin6;
3728
3729 if (addr->sa_family != AF_INET6)
3730 return 0;
3731
3732 sin6 = (struct sockaddr_in6 *) addr;
3733
3734 if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
3735 return 0;
3736
3737 if (!sin6->sin6_scope_id)
3738 return -EINVAL;
3739
3740 dev_addr->bound_dev_if = sin6->sin6_scope_id;
3741 #endif
3742 return 0;
3743 }
3744
rdma_listen(struct rdma_cm_id * id,int backlog)3745 int rdma_listen(struct rdma_cm_id *id, int backlog)
3746 {
3747 struct rdma_id_private *id_priv =
3748 container_of(id, struct rdma_id_private, id);
3749 int ret;
3750
3751 if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_LISTEN)) {
3752 /* For a well behaved ULP state will be RDMA_CM_IDLE */
3753 id->route.addr.src_addr.ss_family = AF_INET;
3754 ret = rdma_bind_addr(id, cma_src_addr(id_priv));
3755 if (ret)
3756 return ret;
3757 if (WARN_ON(!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND,
3758 RDMA_CM_LISTEN)))
3759 return -EINVAL;
3760 }
3761
3762 /*
3763 * Once the ID reaches RDMA_CM_LISTEN it is not allowed to be reusable
3764 * any more, and has to be unique in the bind list.
3765 */
3766 if (id_priv->reuseaddr) {
3767 mutex_lock(&lock);
3768 ret = cma_check_port(id_priv->bind_list, id_priv, 0);
3769 if (!ret)
3770 id_priv->reuseaddr = 0;
3771 mutex_unlock(&lock);
3772 if (ret)
3773 goto err;
3774 }
3775
3776 id_priv->backlog = backlog;
3777 if (id->device) {
3778 if (rdma_cap_ib_cm(id->device, 1)) {
3779 ret = cma_ib_listen(id_priv);
3780 if (ret)
3781 goto err;
3782 } else if (rdma_cap_iw_cm(id->device, 1)) {
3783 ret = cma_iw_listen(id_priv, backlog);
3784 if (ret)
3785 goto err;
3786 } else {
3787 ret = -ENOSYS;
3788 goto err;
3789 }
3790 } else {
3791 ret = cma_listen_on_all(id_priv);
3792 if (ret)
3793 goto err;
3794 }
3795
3796 return 0;
3797 err:
3798 id_priv->backlog = 0;
3799 /*
3800 * All the failure paths that lead here will not allow the req_handler's
3801 * to have run.
3802 */
3803 cma_comp_exch(id_priv, RDMA_CM_LISTEN, RDMA_CM_ADDR_BOUND);
3804 return ret;
3805 }
3806 EXPORT_SYMBOL(rdma_listen);
3807
rdma_bind_addr(struct rdma_cm_id * id,struct sockaddr * addr)3808 int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr)
3809 {
3810 struct rdma_id_private *id_priv;
3811 int ret;
3812 struct sockaddr *daddr;
3813
3814 if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6 &&
3815 addr->sa_family != AF_IB)
3816 return -EAFNOSUPPORT;
3817
3818 id_priv = container_of(id, struct rdma_id_private, id);
3819 if (!cma_comp_exch(id_priv, RDMA_CM_IDLE, RDMA_CM_ADDR_BOUND))
3820 return -EINVAL;
3821
3822 ret = cma_check_linklocal(&id->route.addr.dev_addr, addr);
3823 if (ret)
3824 goto err1;
3825
3826 memcpy(cma_src_addr(id_priv), addr, rdma_addr_size(addr));
3827 if (!cma_any_addr(addr)) {
3828 ret = cma_translate_addr(addr, &id->route.addr.dev_addr);
3829 if (ret)
3830 goto err1;
3831
3832 ret = cma_acquire_dev_by_src_ip(id_priv);
3833 if (ret)
3834 goto err1;
3835 }
3836
3837 if (!(id_priv->options & (1 << CMA_OPTION_AFONLY))) {
3838 if (addr->sa_family == AF_INET)
3839 id_priv->afonly = 1;
3840 #if IS_ENABLED(CONFIG_IPV6)
3841 else if (addr->sa_family == AF_INET6) {
3842 struct net *net = id_priv->id.route.addr.dev_addr.net;
3843
3844 id_priv->afonly = net->ipv6.sysctl.bindv6only;
3845 }
3846 #endif
3847 }
3848 daddr = cma_dst_addr(id_priv);
3849 daddr->sa_family = addr->sa_family;
3850
3851 ret = cma_get_port(id_priv);
3852 if (ret)
3853 goto err2;
3854
3855 if (!cma_any_addr(addr))
3856 rdma_restrack_add(&id_priv->res);
3857 return 0;
3858 err2:
3859 if (id_priv->cma_dev)
3860 cma_release_dev(id_priv);
3861 err1:
3862 cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_IDLE);
3863 return ret;
3864 }
3865 EXPORT_SYMBOL(rdma_bind_addr);
3866
cma_format_hdr(void * hdr,struct rdma_id_private * id_priv)3867 static int cma_format_hdr(void *hdr, struct rdma_id_private *id_priv)
3868 {
3869 struct cma_hdr *cma_hdr;
3870
3871 cma_hdr = hdr;
3872 cma_hdr->cma_version = CMA_VERSION;
3873 if (cma_family(id_priv) == AF_INET) {
3874 struct sockaddr_in *src4, *dst4;
3875
3876 src4 = (struct sockaddr_in *) cma_src_addr(id_priv);
3877 dst4 = (struct sockaddr_in *) cma_dst_addr(id_priv);
3878
3879 cma_set_ip_ver(cma_hdr, 4);
3880 cma_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
3881 cma_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
3882 cma_hdr->port = src4->sin_port;
3883 } else if (cma_family(id_priv) == AF_INET6) {
3884 struct sockaddr_in6 *src6, *dst6;
3885
3886 src6 = (struct sockaddr_in6 *) cma_src_addr(id_priv);
3887 dst6 = (struct sockaddr_in6 *) cma_dst_addr(id_priv);
3888
3889 cma_set_ip_ver(cma_hdr, 6);
3890 cma_hdr->src_addr.ip6 = src6->sin6_addr;
3891 cma_hdr->dst_addr.ip6 = dst6->sin6_addr;
3892 cma_hdr->port = src6->sin6_port;
3893 }
3894 return 0;
3895 }
3896
cma_sidr_rep_handler(struct ib_cm_id * cm_id,const struct ib_cm_event * ib_event)3897 static int cma_sidr_rep_handler(struct ib_cm_id *cm_id,
3898 const struct ib_cm_event *ib_event)
3899 {
3900 struct rdma_id_private *id_priv = cm_id->context;
3901 struct rdma_cm_event event = {};
3902 const struct ib_cm_sidr_rep_event_param *rep =
3903 &ib_event->param.sidr_rep_rcvd;
3904 int ret;
3905
3906 mutex_lock(&id_priv->handler_mutex);
3907 if (READ_ONCE(id_priv->state) != RDMA_CM_CONNECT)
3908 goto out;
3909
3910 switch (ib_event->event) {
3911 case IB_CM_SIDR_REQ_ERROR:
3912 event.event = RDMA_CM_EVENT_UNREACHABLE;
3913 event.status = -ETIMEDOUT;
3914 break;
3915 case IB_CM_SIDR_REP_RECEIVED:
3916 event.param.ud.private_data = ib_event->private_data;
3917 event.param.ud.private_data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
3918 if (rep->status != IB_SIDR_SUCCESS) {
3919 event.event = RDMA_CM_EVENT_UNREACHABLE;
3920 event.status = ib_event->param.sidr_rep_rcvd.status;
3921 pr_debug_ratelimited("RDMA CM: UNREACHABLE: bad SIDR reply. status %d\n",
3922 event.status);
3923 break;
3924 }
3925 ret = cma_set_qkey(id_priv, rep->qkey);
3926 if (ret) {
3927 pr_debug_ratelimited("RDMA CM: ADDR_ERROR: failed to set qkey. status %d\n", ret);
3928 event.event = RDMA_CM_EVENT_ADDR_ERROR;
3929 event.status = ret;
3930 break;
3931 }
3932 ib_init_ah_attr_from_path(id_priv->id.device,
3933 id_priv->id.port_num,
3934 id_priv->id.route.path_rec,
3935 &event.param.ud.ah_attr,
3936 rep->sgid_attr);
3937 event.param.ud.qp_num = rep->qpn;
3938 event.param.ud.qkey = rep->qkey;
3939 event.event = RDMA_CM_EVENT_ESTABLISHED;
3940 event.status = 0;
3941 break;
3942 default:
3943 pr_err("RDMA CMA: unexpected IB CM event: %d\n",
3944 ib_event->event);
3945 goto out;
3946 }
3947
3948 ret = cma_cm_event_handler(id_priv, &event);
3949
3950 rdma_destroy_ah_attr(&event.param.ud.ah_attr);
3951 if (ret) {
3952 /* Destroy the CM ID by returning a non-zero value. */
3953 id_priv->cm_id.ib = NULL;
3954 destroy_id_handler_unlock(id_priv);
3955 return ret;
3956 }
3957 out:
3958 mutex_unlock(&id_priv->handler_mutex);
3959 return 0;
3960 }
3961
cma_resolve_ib_udp(struct rdma_id_private * id_priv,struct rdma_conn_param * conn_param)3962 static int cma_resolve_ib_udp(struct rdma_id_private *id_priv,
3963 struct rdma_conn_param *conn_param)
3964 {
3965 struct ib_cm_sidr_req_param req;
3966 struct ib_cm_id *id;
3967 void *private_data;
3968 u8 offset;
3969 int ret;
3970
3971 memset(&req, 0, sizeof req);
3972 offset = cma_user_data_offset(id_priv);
3973 req.private_data_len = offset + conn_param->private_data_len;
3974 if (req.private_data_len < conn_param->private_data_len)
3975 return -EINVAL;
3976
3977 if (req.private_data_len) {
3978 private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
3979 if (!private_data)
3980 return -ENOMEM;
3981 } else {
3982 private_data = NULL;
3983 }
3984
3985 if (conn_param->private_data && conn_param->private_data_len)
3986 memcpy(private_data + offset, conn_param->private_data,
3987 conn_param->private_data_len);
3988
3989 if (private_data) {
3990 ret = cma_format_hdr(private_data, id_priv);
3991 if (ret)
3992 goto out;
3993 req.private_data = private_data;
3994 }
3995
3996 id = ib_create_cm_id(id_priv->id.device, cma_sidr_rep_handler,
3997 id_priv);
3998 if (IS_ERR(id)) {
3999 ret = PTR_ERR(id);
4000 goto out;
4001 }
4002 id_priv->cm_id.ib = id;
4003
4004 req.path = id_priv->id.route.path_rec;
4005 req.sgid_attr = id_priv->id.route.addr.dev_addr.sgid_attr;
4006 req.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
4007 req.timeout_ms = 1 << (CMA_CM_RESPONSE_TIMEOUT - 8);
4008 req.max_cm_retries = CMA_MAX_CM_RETRIES;
4009
4010 trace_cm_send_sidr_req(id_priv);
4011 ret = ib_send_cm_sidr_req(id_priv->cm_id.ib, &req);
4012 if (ret) {
4013 ib_destroy_cm_id(id_priv->cm_id.ib);
4014 id_priv->cm_id.ib = NULL;
4015 }
4016 out:
4017 kfree(private_data);
4018 return ret;
4019 }
4020
cma_connect_ib(struct rdma_id_private * id_priv,struct rdma_conn_param * conn_param)4021 static int cma_connect_ib(struct rdma_id_private *id_priv,
4022 struct rdma_conn_param *conn_param)
4023 {
4024 struct ib_cm_req_param req;
4025 struct rdma_route *route;
4026 void *private_data;
4027 struct ib_cm_id *id;
4028 u8 offset;
4029 int ret;
4030
4031 memset(&req, 0, sizeof req);
4032 offset = cma_user_data_offset(id_priv);
4033 req.private_data_len = offset + conn_param->private_data_len;
4034 if (req.private_data_len < conn_param->private_data_len)
4035 return -EINVAL;
4036
4037 if (req.private_data_len) {
4038 private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
4039 if (!private_data)
4040 return -ENOMEM;
4041 } else {
4042 private_data = NULL;
4043 }
4044
4045 if (conn_param->private_data && conn_param->private_data_len)
4046 memcpy(private_data + offset, conn_param->private_data,
4047 conn_param->private_data_len);
4048
4049 id = ib_create_cm_id(id_priv->id.device, cma_ib_handler, id_priv);
4050 if (IS_ERR(id)) {
4051 ret = PTR_ERR(id);
4052 goto out;
4053 }
4054 id_priv->cm_id.ib = id;
4055
4056 route = &id_priv->id.route;
4057 if (private_data) {
4058 ret = cma_format_hdr(private_data, id_priv);
4059 if (ret)
4060 goto out;
4061 req.private_data = private_data;
4062 }
4063
4064 req.primary_path = &route->path_rec[0];
4065 if (route->num_paths == 2)
4066 req.alternate_path = &route->path_rec[1];
4067
4068 req.ppath_sgid_attr = id_priv->id.route.addr.dev_addr.sgid_attr;
4069 /* Alternate path SGID attribute currently unsupported */
4070 req.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
4071 req.qp_num = id_priv->qp_num;
4072 req.qp_type = id_priv->id.qp_type;
4073 req.starting_psn = id_priv->seq_num;
4074 req.responder_resources = conn_param->responder_resources;
4075 req.initiator_depth = conn_param->initiator_depth;
4076 req.flow_control = conn_param->flow_control;
4077 req.retry_count = min_t(u8, 7, conn_param->retry_count);
4078 req.rnr_retry_count = min_t(u8, 7, conn_param->rnr_retry_count);
4079 req.remote_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
4080 req.local_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
4081 req.max_cm_retries = CMA_MAX_CM_RETRIES;
4082 req.srq = id_priv->srq ? 1 : 0;
4083 req.ece.vendor_id = id_priv->ece.vendor_id;
4084 req.ece.attr_mod = id_priv->ece.attr_mod;
4085
4086 trace_cm_send_req(id_priv);
4087 ret = ib_send_cm_req(id_priv->cm_id.ib, &req);
4088 out:
4089 if (ret && !IS_ERR(id)) {
4090 ib_destroy_cm_id(id);
4091 id_priv->cm_id.ib = NULL;
4092 }
4093
4094 kfree(private_data);
4095 return ret;
4096 }
4097
cma_connect_iw(struct rdma_id_private * id_priv,struct rdma_conn_param * conn_param)4098 static int cma_connect_iw(struct rdma_id_private *id_priv,
4099 struct rdma_conn_param *conn_param)
4100 {
4101 struct iw_cm_id *cm_id;
4102 int ret;
4103 struct iw_cm_conn_param iw_param;
4104
4105 cm_id = iw_create_cm_id(id_priv->id.device, cma_iw_handler, id_priv);
4106 if (IS_ERR(cm_id))
4107 return PTR_ERR(cm_id);
4108
4109 cm_id->tos = id_priv->tos;
4110 cm_id->tos_set = id_priv->tos_set;
4111 id_priv->cm_id.iw = cm_id;
4112
4113 memcpy(&cm_id->local_addr, cma_src_addr(id_priv),
4114 rdma_addr_size(cma_src_addr(id_priv)));
4115 memcpy(&cm_id->remote_addr, cma_dst_addr(id_priv),
4116 rdma_addr_size(cma_dst_addr(id_priv)));
4117
4118 ret = cma_modify_qp_rtr(id_priv, conn_param);
4119 if (ret)
4120 goto out;
4121
4122 if (conn_param) {
4123 iw_param.ord = conn_param->initiator_depth;
4124 iw_param.ird = conn_param->responder_resources;
4125 iw_param.private_data = conn_param->private_data;
4126 iw_param.private_data_len = conn_param->private_data_len;
4127 iw_param.qpn = id_priv->id.qp ? id_priv->qp_num : conn_param->qp_num;
4128 } else {
4129 memset(&iw_param, 0, sizeof iw_param);
4130 iw_param.qpn = id_priv->qp_num;
4131 }
4132 ret = iw_cm_connect(cm_id, &iw_param);
4133 out:
4134 if (ret) {
4135 iw_destroy_cm_id(cm_id);
4136 id_priv->cm_id.iw = NULL;
4137 }
4138 return ret;
4139 }
4140
4141 /**
4142 * rdma_connect_locked - Initiate an active connection request.
4143 * @id: Connection identifier to connect.
4144 * @conn_param: Connection information used for connected QPs.
4145 *
4146 * Same as rdma_connect() but can only be called from the
4147 * RDMA_CM_EVENT_ROUTE_RESOLVED handler callback.
4148 */
rdma_connect_locked(struct rdma_cm_id * id,struct rdma_conn_param * conn_param)4149 int rdma_connect_locked(struct rdma_cm_id *id,
4150 struct rdma_conn_param *conn_param)
4151 {
4152 struct rdma_id_private *id_priv =
4153 container_of(id, struct rdma_id_private, id);
4154 int ret;
4155
4156 if (!cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_CONNECT))
4157 return -EINVAL;
4158
4159 if (!id->qp) {
4160 id_priv->qp_num = conn_param->qp_num;
4161 id_priv->srq = conn_param->srq;
4162 }
4163
4164 if (rdma_cap_ib_cm(id->device, id->port_num)) {
4165 if (id->qp_type == IB_QPT_UD)
4166 ret = cma_resolve_ib_udp(id_priv, conn_param);
4167 else
4168 ret = cma_connect_ib(id_priv, conn_param);
4169 } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
4170 ret = cma_connect_iw(id_priv, conn_param);
4171 } else {
4172 ret = -ENOSYS;
4173 }
4174 if (ret)
4175 goto err_state;
4176 return 0;
4177 err_state:
4178 cma_comp_exch(id_priv, RDMA_CM_CONNECT, RDMA_CM_ROUTE_RESOLVED);
4179 return ret;
4180 }
4181 EXPORT_SYMBOL(rdma_connect_locked);
4182
4183 /**
4184 * rdma_connect - Initiate an active connection request.
4185 * @id: Connection identifier to connect.
4186 * @conn_param: Connection information used for connected QPs.
4187 *
4188 * Users must have resolved a route for the rdma_cm_id to connect with by having
4189 * called rdma_resolve_route before calling this routine.
4190 *
4191 * This call will either connect to a remote QP or obtain remote QP information
4192 * for unconnected rdma_cm_id's. The actual operation is based on the
4193 * rdma_cm_id's port space.
4194 */
rdma_connect(struct rdma_cm_id * id,struct rdma_conn_param * conn_param)4195 int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
4196 {
4197 struct rdma_id_private *id_priv =
4198 container_of(id, struct rdma_id_private, id);
4199 int ret;
4200
4201 mutex_lock(&id_priv->handler_mutex);
4202 ret = rdma_connect_locked(id, conn_param);
4203 mutex_unlock(&id_priv->handler_mutex);
4204 return ret;
4205 }
4206 EXPORT_SYMBOL(rdma_connect);
4207
4208 /**
4209 * rdma_connect_ece - Initiate an active connection request with ECE data.
4210 * @id: Connection identifier to connect.
4211 * @conn_param: Connection information used for connected QPs.
4212 * @ece: ECE parameters
4213 *
4214 * See rdma_connect() explanation.
4215 */
rdma_connect_ece(struct rdma_cm_id * id,struct rdma_conn_param * conn_param,struct rdma_ucm_ece * ece)4216 int rdma_connect_ece(struct rdma_cm_id *id, struct rdma_conn_param *conn_param,
4217 struct rdma_ucm_ece *ece)
4218 {
4219 struct rdma_id_private *id_priv =
4220 container_of(id, struct rdma_id_private, id);
4221
4222 id_priv->ece.vendor_id = ece->vendor_id;
4223 id_priv->ece.attr_mod = ece->attr_mod;
4224
4225 return rdma_connect(id, conn_param);
4226 }
4227 EXPORT_SYMBOL(rdma_connect_ece);
4228
cma_accept_ib(struct rdma_id_private * id_priv,struct rdma_conn_param * conn_param)4229 static int cma_accept_ib(struct rdma_id_private *id_priv,
4230 struct rdma_conn_param *conn_param)
4231 {
4232 struct ib_cm_rep_param rep;
4233 int ret;
4234
4235 ret = cma_modify_qp_rtr(id_priv, conn_param);
4236 if (ret)
4237 goto out;
4238
4239 ret = cma_modify_qp_rts(id_priv, conn_param);
4240 if (ret)
4241 goto out;
4242
4243 memset(&rep, 0, sizeof rep);
4244 rep.qp_num = id_priv->qp_num;
4245 rep.starting_psn = id_priv->seq_num;
4246 rep.private_data = conn_param->private_data;
4247 rep.private_data_len = conn_param->private_data_len;
4248 rep.responder_resources = conn_param->responder_resources;
4249 rep.initiator_depth = conn_param->initiator_depth;
4250 rep.failover_accepted = 0;
4251 rep.flow_control = conn_param->flow_control;
4252 rep.rnr_retry_count = min_t(u8, 7, conn_param->rnr_retry_count);
4253 rep.srq = id_priv->srq ? 1 : 0;
4254 rep.ece.vendor_id = id_priv->ece.vendor_id;
4255 rep.ece.attr_mod = id_priv->ece.attr_mod;
4256
4257 trace_cm_send_rep(id_priv);
4258 ret = ib_send_cm_rep(id_priv->cm_id.ib, &rep);
4259 out:
4260 return ret;
4261 }
4262
cma_accept_iw(struct rdma_id_private * id_priv,struct rdma_conn_param * conn_param)4263 static int cma_accept_iw(struct rdma_id_private *id_priv,
4264 struct rdma_conn_param *conn_param)
4265 {
4266 struct iw_cm_conn_param iw_param;
4267 int ret;
4268
4269 if (!conn_param)
4270 return -EINVAL;
4271
4272 ret = cma_modify_qp_rtr(id_priv, conn_param);
4273 if (ret)
4274 return ret;
4275
4276 iw_param.ord = conn_param->initiator_depth;
4277 iw_param.ird = conn_param->responder_resources;
4278 iw_param.private_data = conn_param->private_data;
4279 iw_param.private_data_len = conn_param->private_data_len;
4280 if (id_priv->id.qp)
4281 iw_param.qpn = id_priv->qp_num;
4282 else
4283 iw_param.qpn = conn_param->qp_num;
4284
4285 return iw_cm_accept(id_priv->cm_id.iw, &iw_param);
4286 }
4287
cma_send_sidr_rep(struct rdma_id_private * id_priv,enum ib_cm_sidr_status status,u32 qkey,const void * private_data,int private_data_len)4288 static int cma_send_sidr_rep(struct rdma_id_private *id_priv,
4289 enum ib_cm_sidr_status status, u32 qkey,
4290 const void *private_data, int private_data_len)
4291 {
4292 struct ib_cm_sidr_rep_param rep;
4293 int ret;
4294
4295 memset(&rep, 0, sizeof rep);
4296 rep.status = status;
4297 if (status == IB_SIDR_SUCCESS) {
4298 ret = cma_set_qkey(id_priv, qkey);
4299 if (ret)
4300 return ret;
4301 rep.qp_num = id_priv->qp_num;
4302 rep.qkey = id_priv->qkey;
4303
4304 rep.ece.vendor_id = id_priv->ece.vendor_id;
4305 rep.ece.attr_mod = id_priv->ece.attr_mod;
4306 }
4307
4308 rep.private_data = private_data;
4309 rep.private_data_len = private_data_len;
4310
4311 trace_cm_send_sidr_rep(id_priv);
4312 return ib_send_cm_sidr_rep(id_priv->cm_id.ib, &rep);
4313 }
4314
4315 /**
4316 * rdma_accept - Called to accept a connection request or response.
4317 * @id: Connection identifier associated with the request.
4318 * @conn_param: Information needed to establish the connection. This must be
4319 * provided if accepting a connection request. If accepting a connection
4320 * response, this parameter must be NULL.
4321 *
4322 * Typically, this routine is only called by the listener to accept a connection
4323 * request. It must also be called on the active side of a connection if the
4324 * user is performing their own QP transitions.
4325 *
4326 * In the case of error, a reject message is sent to the remote side and the
4327 * state of the qp associated with the id is modified to error, such that any
4328 * previously posted receive buffers would be flushed.
4329 *
4330 * This function is for use by kernel ULPs and must be called from under the
4331 * handler callback.
4332 */
rdma_accept(struct rdma_cm_id * id,struct rdma_conn_param * conn_param)4333 int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
4334 {
4335 struct rdma_id_private *id_priv =
4336 container_of(id, struct rdma_id_private, id);
4337 int ret;
4338
4339 lockdep_assert_held(&id_priv->handler_mutex);
4340
4341 if (READ_ONCE(id_priv->state) != RDMA_CM_CONNECT)
4342 return -EINVAL;
4343
4344 if (!id->qp && conn_param) {
4345 id_priv->qp_num = conn_param->qp_num;
4346 id_priv->srq = conn_param->srq;
4347 }
4348
4349 if (rdma_cap_ib_cm(id->device, id->port_num)) {
4350 if (id->qp_type == IB_QPT_UD) {
4351 if (conn_param)
4352 ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
4353 conn_param->qkey,
4354 conn_param->private_data,
4355 conn_param->private_data_len);
4356 else
4357 ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
4358 0, NULL, 0);
4359 } else {
4360 if (conn_param)
4361 ret = cma_accept_ib(id_priv, conn_param);
4362 else
4363 ret = cma_rep_recv(id_priv);
4364 }
4365 } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
4366 ret = cma_accept_iw(id_priv, conn_param);
4367 } else {
4368 ret = -ENOSYS;
4369 }
4370 if (ret)
4371 goto reject;
4372
4373 return 0;
4374 reject:
4375 cma_modify_qp_err(id_priv);
4376 rdma_reject(id, NULL, 0, IB_CM_REJ_CONSUMER_DEFINED);
4377 return ret;
4378 }
4379 EXPORT_SYMBOL(rdma_accept);
4380
rdma_accept_ece(struct rdma_cm_id * id,struct rdma_conn_param * conn_param,struct rdma_ucm_ece * ece)4381 int rdma_accept_ece(struct rdma_cm_id *id, struct rdma_conn_param *conn_param,
4382 struct rdma_ucm_ece *ece)
4383 {
4384 struct rdma_id_private *id_priv =
4385 container_of(id, struct rdma_id_private, id);
4386
4387 id_priv->ece.vendor_id = ece->vendor_id;
4388 id_priv->ece.attr_mod = ece->attr_mod;
4389
4390 return rdma_accept(id, conn_param);
4391 }
4392 EXPORT_SYMBOL(rdma_accept_ece);
4393
rdma_lock_handler(struct rdma_cm_id * id)4394 void rdma_lock_handler(struct rdma_cm_id *id)
4395 {
4396 struct rdma_id_private *id_priv =
4397 container_of(id, struct rdma_id_private, id);
4398
4399 mutex_lock(&id_priv->handler_mutex);
4400 }
4401 EXPORT_SYMBOL(rdma_lock_handler);
4402
rdma_unlock_handler(struct rdma_cm_id * id)4403 void rdma_unlock_handler(struct rdma_cm_id *id)
4404 {
4405 struct rdma_id_private *id_priv =
4406 container_of(id, struct rdma_id_private, id);
4407
4408 mutex_unlock(&id_priv->handler_mutex);
4409 }
4410 EXPORT_SYMBOL(rdma_unlock_handler);
4411
rdma_notify(struct rdma_cm_id * id,enum ib_event_type event)4412 int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event)
4413 {
4414 struct rdma_id_private *id_priv;
4415 int ret;
4416
4417 id_priv = container_of(id, struct rdma_id_private, id);
4418 if (!id_priv->cm_id.ib)
4419 return -EINVAL;
4420
4421 switch (id->device->node_type) {
4422 case RDMA_NODE_IB_CA:
4423 ret = ib_cm_notify(id_priv->cm_id.ib, event);
4424 break;
4425 default:
4426 ret = 0;
4427 break;
4428 }
4429 return ret;
4430 }
4431 EXPORT_SYMBOL(rdma_notify);
4432
rdma_reject(struct rdma_cm_id * id,const void * private_data,u8 private_data_len,u8 reason)4433 int rdma_reject(struct rdma_cm_id *id, const void *private_data,
4434 u8 private_data_len, u8 reason)
4435 {
4436 struct rdma_id_private *id_priv;
4437 int ret;
4438
4439 id_priv = container_of(id, struct rdma_id_private, id);
4440 if (!id_priv->cm_id.ib)
4441 return -EINVAL;
4442
4443 if (rdma_cap_ib_cm(id->device, id->port_num)) {
4444 if (id->qp_type == IB_QPT_UD) {
4445 ret = cma_send_sidr_rep(id_priv, IB_SIDR_REJECT, 0,
4446 private_data, private_data_len);
4447 } else {
4448 trace_cm_send_rej(id_priv);
4449 ret = ib_send_cm_rej(id_priv->cm_id.ib, reason, NULL, 0,
4450 private_data, private_data_len);
4451 }
4452 } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
4453 ret = iw_cm_reject(id_priv->cm_id.iw,
4454 private_data, private_data_len);
4455 } else {
4456 ret = -ENOSYS;
4457 }
4458
4459 return ret;
4460 }
4461 EXPORT_SYMBOL(rdma_reject);
4462
rdma_disconnect(struct rdma_cm_id * id)4463 int rdma_disconnect(struct rdma_cm_id *id)
4464 {
4465 struct rdma_id_private *id_priv;
4466 int ret;
4467
4468 id_priv = container_of(id, struct rdma_id_private, id);
4469 if (!id_priv->cm_id.ib)
4470 return -EINVAL;
4471
4472 if (rdma_cap_ib_cm(id->device, id->port_num)) {
4473 ret = cma_modify_qp_err(id_priv);
4474 if (ret)
4475 goto out;
4476 /* Initiate or respond to a disconnect. */
4477 trace_cm_disconnect(id_priv);
4478 if (ib_send_cm_dreq(id_priv->cm_id.ib, NULL, 0)) {
4479 if (!ib_send_cm_drep(id_priv->cm_id.ib, NULL, 0))
4480 trace_cm_sent_drep(id_priv);
4481 } else {
4482 trace_cm_sent_dreq(id_priv);
4483 }
4484 } else if (rdma_cap_iw_cm(id->device, id->port_num)) {
4485 ret = iw_cm_disconnect(id_priv->cm_id.iw, 0);
4486 } else
4487 ret = -EINVAL;
4488
4489 out:
4490 return ret;
4491 }
4492 EXPORT_SYMBOL(rdma_disconnect);
4493
cma_make_mc_event(int status,struct rdma_id_private * id_priv,struct ib_sa_multicast * multicast,struct rdma_cm_event * event,struct cma_multicast * mc)4494 static void cma_make_mc_event(int status, struct rdma_id_private *id_priv,
4495 struct ib_sa_multicast *multicast,
4496 struct rdma_cm_event *event,
4497 struct cma_multicast *mc)
4498 {
4499 struct rdma_dev_addr *dev_addr;
4500 enum ib_gid_type gid_type;
4501 struct net_device *ndev;
4502
4503 if (!status)
4504 status = cma_set_qkey(id_priv, be32_to_cpu(multicast->rec.qkey));
4505 else
4506 pr_debug_ratelimited("RDMA CM: MULTICAST_ERROR: failed to join multicast. status %d\n",
4507 status);
4508
4509 event->status = status;
4510 event->param.ud.private_data = mc->context;
4511 if (status) {
4512 event->event = RDMA_CM_EVENT_MULTICAST_ERROR;
4513 return;
4514 }
4515
4516 dev_addr = &id_priv->id.route.addr.dev_addr;
4517 ndev = dev_get_by_index(dev_addr->net, dev_addr->bound_dev_if);
4518 gid_type =
4519 id_priv->cma_dev
4520 ->default_gid_type[id_priv->id.port_num -
4521 rdma_start_port(
4522 id_priv->cma_dev->device)];
4523
4524 event->event = RDMA_CM_EVENT_MULTICAST_JOIN;
4525 if (ib_init_ah_from_mcmember(id_priv->id.device, id_priv->id.port_num,
4526 &multicast->rec, ndev, gid_type,
4527 &event->param.ud.ah_attr)) {
4528 event->event = RDMA_CM_EVENT_MULTICAST_ERROR;
4529 goto out;
4530 }
4531
4532 event->param.ud.qp_num = 0xFFFFFF;
4533 event->param.ud.qkey = be32_to_cpu(multicast->rec.qkey);
4534
4535 out:
4536 if (ndev)
4537 dev_put(ndev);
4538 }
4539
cma_ib_mc_handler(int status,struct ib_sa_multicast * multicast)4540 static int cma_ib_mc_handler(int status, struct ib_sa_multicast *multicast)
4541 {
4542 struct cma_multicast *mc = multicast->context;
4543 struct rdma_id_private *id_priv = mc->id_priv;
4544 struct rdma_cm_event event = {};
4545 int ret = 0;
4546
4547 mutex_lock(&id_priv->handler_mutex);
4548 if (READ_ONCE(id_priv->state) == RDMA_CM_DEVICE_REMOVAL ||
4549 READ_ONCE(id_priv->state) == RDMA_CM_DESTROYING)
4550 goto out;
4551
4552 cma_make_mc_event(status, id_priv, multicast, &event, mc);
4553 ret = cma_cm_event_handler(id_priv, &event);
4554 rdma_destroy_ah_attr(&event.param.ud.ah_attr);
4555 WARN_ON(ret);
4556
4557 out:
4558 mutex_unlock(&id_priv->handler_mutex);
4559 return 0;
4560 }
4561
cma_set_mgid(struct rdma_id_private * id_priv,struct sockaddr * addr,union ib_gid * mgid)4562 static void cma_set_mgid(struct rdma_id_private *id_priv,
4563 struct sockaddr *addr, union ib_gid *mgid)
4564 {
4565 unsigned char mc_map[MAX_ADDR_LEN];
4566 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
4567 struct sockaddr_in *sin = (struct sockaddr_in *) addr;
4568 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) addr;
4569
4570 if (cma_any_addr(addr)) {
4571 memset(mgid, 0, sizeof *mgid);
4572 } else if ((addr->sa_family == AF_INET6) &&
4573 ((be32_to_cpu(sin6->sin6_addr.s6_addr32[0]) & 0xFFF0FFFF) ==
4574 0xFF10A01B)) {
4575 /* IPv6 address is an SA assigned MGID. */
4576 memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
4577 } else if (addr->sa_family == AF_IB) {
4578 memcpy(mgid, &((struct sockaddr_ib *) addr)->sib_addr, sizeof *mgid);
4579 } else if (addr->sa_family == AF_INET6) {
4580 ipv6_ib_mc_map(&sin6->sin6_addr, dev_addr->broadcast, mc_map);
4581 if (id_priv->id.ps == RDMA_PS_UDP)
4582 mc_map[7] = 0x01; /* Use RDMA CM signature */
4583 *mgid = *(union ib_gid *) (mc_map + 4);
4584 } else {
4585 ip_ib_mc_map(sin->sin_addr.s_addr, dev_addr->broadcast, mc_map);
4586 if (id_priv->id.ps == RDMA_PS_UDP)
4587 mc_map[7] = 0x01; /* Use RDMA CM signature */
4588 *mgid = *(union ib_gid *) (mc_map + 4);
4589 }
4590 }
4591
cma_join_ib_multicast(struct rdma_id_private * id_priv,struct cma_multicast * mc)4592 static int cma_join_ib_multicast(struct rdma_id_private *id_priv,
4593 struct cma_multicast *mc)
4594 {
4595 struct ib_sa_mcmember_rec rec;
4596 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
4597 ib_sa_comp_mask comp_mask;
4598 int ret;
4599
4600 ib_addr_get_mgid(dev_addr, &rec.mgid);
4601 ret = ib_sa_get_mcmember_rec(id_priv->id.device, id_priv->id.port_num,
4602 &rec.mgid, &rec);
4603 if (ret)
4604 return ret;
4605
4606 ret = cma_set_qkey(id_priv, 0);
4607 if (ret)
4608 return ret;
4609
4610 cma_set_mgid(id_priv, (struct sockaddr *) &mc->addr, &rec.mgid);
4611 rec.qkey = cpu_to_be32(id_priv->qkey);
4612 rdma_addr_get_sgid(dev_addr, &rec.port_gid);
4613 rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
4614 rec.join_state = mc->join_state;
4615
4616 comp_mask = IB_SA_MCMEMBER_REC_MGID | IB_SA_MCMEMBER_REC_PORT_GID |
4617 IB_SA_MCMEMBER_REC_PKEY | IB_SA_MCMEMBER_REC_JOIN_STATE |
4618 IB_SA_MCMEMBER_REC_QKEY | IB_SA_MCMEMBER_REC_SL |
4619 IB_SA_MCMEMBER_REC_FLOW_LABEL |
4620 IB_SA_MCMEMBER_REC_TRAFFIC_CLASS;
4621
4622 if (id_priv->id.ps == RDMA_PS_IPOIB)
4623 comp_mask |= IB_SA_MCMEMBER_REC_RATE |
4624 IB_SA_MCMEMBER_REC_RATE_SELECTOR |
4625 IB_SA_MCMEMBER_REC_MTU_SELECTOR |
4626 IB_SA_MCMEMBER_REC_MTU |
4627 IB_SA_MCMEMBER_REC_HOP_LIMIT;
4628
4629 mc->sa_mc = ib_sa_join_multicast(&sa_client, id_priv->id.device,
4630 id_priv->id.port_num, &rec, comp_mask,
4631 GFP_KERNEL, cma_ib_mc_handler, mc);
4632 return PTR_ERR_OR_ZERO(mc->sa_mc);
4633 }
4634
cma_iboe_set_mgid(struct sockaddr * addr,union ib_gid * mgid,enum ib_gid_type gid_type)4635 static void cma_iboe_set_mgid(struct sockaddr *addr, union ib_gid *mgid,
4636 enum ib_gid_type gid_type)
4637 {
4638 struct sockaddr_in *sin = (struct sockaddr_in *)addr;
4639 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr;
4640
4641 if (cma_any_addr(addr)) {
4642 memset(mgid, 0, sizeof *mgid);
4643 } else if (addr->sa_family == AF_INET6) {
4644 memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
4645 } else {
4646 mgid->raw[0] =
4647 (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) ? 0 : 0xff;
4648 mgid->raw[1] =
4649 (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) ? 0 : 0x0e;
4650 mgid->raw[2] = 0;
4651 mgid->raw[3] = 0;
4652 mgid->raw[4] = 0;
4653 mgid->raw[5] = 0;
4654 mgid->raw[6] = 0;
4655 mgid->raw[7] = 0;
4656 mgid->raw[8] = 0;
4657 mgid->raw[9] = 0;
4658 mgid->raw[10] = 0xff;
4659 mgid->raw[11] = 0xff;
4660 *(__be32 *)(&mgid->raw[12]) = sin->sin_addr.s_addr;
4661 }
4662 }
4663
cma_iboe_join_multicast(struct rdma_id_private * id_priv,struct cma_multicast * mc)4664 static int cma_iboe_join_multicast(struct rdma_id_private *id_priv,
4665 struct cma_multicast *mc)
4666 {
4667 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
4668 int err = 0;
4669 struct sockaddr *addr = (struct sockaddr *)&mc->addr;
4670 struct net_device *ndev = NULL;
4671 struct ib_sa_multicast ib;
4672 enum ib_gid_type gid_type;
4673 bool send_only;
4674
4675 send_only = mc->join_state == BIT(SENDONLY_FULLMEMBER_JOIN);
4676
4677 if (cma_zero_addr(addr))
4678 return -EINVAL;
4679
4680 gid_type = id_priv->cma_dev->default_gid_type[id_priv->id.port_num -
4681 rdma_start_port(id_priv->cma_dev->device)];
4682 cma_iboe_set_mgid(addr, &ib.rec.mgid, gid_type);
4683
4684 ib.rec.pkey = cpu_to_be16(0xffff);
4685 if (id_priv->id.ps == RDMA_PS_UDP)
4686 ib.rec.qkey = cpu_to_be32(RDMA_UDP_QKEY);
4687
4688 if (dev_addr->bound_dev_if)
4689 ndev = dev_get_by_index(dev_addr->net, dev_addr->bound_dev_if);
4690 if (!ndev)
4691 return -ENODEV;
4692
4693 ib.rec.rate = iboe_get_rate(ndev);
4694 ib.rec.hop_limit = 1;
4695 ib.rec.mtu = iboe_get_mtu(ndev->mtu);
4696
4697 if (addr->sa_family == AF_INET) {
4698 if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) {
4699 ib.rec.hop_limit = IPV6_DEFAULT_HOPLIMIT;
4700 if (!send_only) {
4701 err = cma_igmp_send(ndev, &ib.rec.mgid,
4702 true);
4703 }
4704 }
4705 } else {
4706 if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP)
4707 err = -ENOTSUPP;
4708 }
4709 dev_put(ndev);
4710 if (err || !ib.rec.mtu)
4711 return err ?: -EINVAL;
4712
4713 rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
4714 &ib.rec.port_gid);
4715 INIT_WORK(&mc->iboe_join.work, cma_iboe_join_work_handler);
4716 cma_make_mc_event(0, id_priv, &ib, &mc->iboe_join.event, mc);
4717 queue_work(cma_wq, &mc->iboe_join.work);
4718 return 0;
4719 }
4720
rdma_join_multicast(struct rdma_cm_id * id,struct sockaddr * addr,u8 join_state,void * context)4721 int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
4722 u8 join_state, void *context)
4723 {
4724 struct rdma_id_private *id_priv =
4725 container_of(id, struct rdma_id_private, id);
4726 struct cma_multicast *mc;
4727 int ret;
4728
4729 /* Not supported for kernel QPs */
4730 if (WARN_ON(id->qp))
4731 return -EINVAL;
4732
4733 /* ULP is calling this wrong. */
4734 if (!id->device || (READ_ONCE(id_priv->state) != RDMA_CM_ADDR_BOUND &&
4735 READ_ONCE(id_priv->state) != RDMA_CM_ADDR_RESOLVED))
4736 return -EINVAL;
4737
4738 mc = kzalloc(sizeof(*mc), GFP_KERNEL);
4739 if (!mc)
4740 return -ENOMEM;
4741
4742 memcpy(&mc->addr, addr, rdma_addr_size(addr));
4743 mc->context = context;
4744 mc->id_priv = id_priv;
4745 mc->join_state = join_state;
4746
4747 if (rdma_protocol_roce(id->device, id->port_num)) {
4748 ret = cma_iboe_join_multicast(id_priv, mc);
4749 if (ret)
4750 goto out_err;
4751 } else if (rdma_cap_ib_mcast(id->device, id->port_num)) {
4752 ret = cma_join_ib_multicast(id_priv, mc);
4753 if (ret)
4754 goto out_err;
4755 } else {
4756 ret = -ENOSYS;
4757 goto out_err;
4758 }
4759
4760 spin_lock(&id_priv->lock);
4761 list_add(&mc->list, &id_priv->mc_list);
4762 spin_unlock(&id_priv->lock);
4763
4764 return 0;
4765 out_err:
4766 kfree(mc);
4767 return ret;
4768 }
4769 EXPORT_SYMBOL(rdma_join_multicast);
4770
rdma_leave_multicast(struct rdma_cm_id * id,struct sockaddr * addr)4771 void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr)
4772 {
4773 struct rdma_id_private *id_priv;
4774 struct cma_multicast *mc;
4775
4776 id_priv = container_of(id, struct rdma_id_private, id);
4777 spin_lock_irq(&id_priv->lock);
4778 list_for_each_entry(mc, &id_priv->mc_list, list) {
4779 if (memcmp(&mc->addr, addr, rdma_addr_size(addr)) != 0)
4780 continue;
4781 list_del(&mc->list);
4782 spin_unlock_irq(&id_priv->lock);
4783
4784 WARN_ON(id_priv->cma_dev->device != id->device);
4785 destroy_mc(id_priv, mc);
4786 return;
4787 }
4788 spin_unlock_irq(&id_priv->lock);
4789 }
4790 EXPORT_SYMBOL(rdma_leave_multicast);
4791
cma_netdev_change(struct net_device * ndev,struct rdma_id_private * id_priv)4792 static int cma_netdev_change(struct net_device *ndev, struct rdma_id_private *id_priv)
4793 {
4794 struct rdma_dev_addr *dev_addr;
4795 struct cma_work *work;
4796
4797 dev_addr = &id_priv->id.route.addr.dev_addr;
4798
4799 if ((dev_addr->bound_dev_if == ndev->ifindex) &&
4800 (net_eq(dev_net(ndev), dev_addr->net)) &&
4801 memcmp(dev_addr->src_dev_addr, ndev->dev_addr, ndev->addr_len)) {
4802 pr_info("RDMA CM addr change for ndev %s used by id %p\n",
4803 ndev->name, &id_priv->id);
4804 work = kzalloc(sizeof *work, GFP_KERNEL);
4805 if (!work)
4806 return -ENOMEM;
4807
4808 INIT_WORK(&work->work, cma_work_handler);
4809 work->id = id_priv;
4810 work->event.event = RDMA_CM_EVENT_ADDR_CHANGE;
4811 cma_id_get(id_priv);
4812 queue_work(cma_wq, &work->work);
4813 }
4814
4815 return 0;
4816 }
4817
cma_netdev_callback(struct notifier_block * self,unsigned long event,void * ptr)4818 static int cma_netdev_callback(struct notifier_block *self, unsigned long event,
4819 void *ptr)
4820 {
4821 struct net_device *ndev = netdev_notifier_info_to_dev(ptr);
4822 struct cma_device *cma_dev;
4823 struct rdma_id_private *id_priv;
4824 int ret = NOTIFY_DONE;
4825
4826 if (event != NETDEV_BONDING_FAILOVER)
4827 return NOTIFY_DONE;
4828
4829 if (!netif_is_bond_master(ndev))
4830 return NOTIFY_DONE;
4831
4832 mutex_lock(&lock);
4833 list_for_each_entry(cma_dev, &dev_list, list)
4834 list_for_each_entry(id_priv, &cma_dev->id_list, list) {
4835 ret = cma_netdev_change(ndev, id_priv);
4836 if (ret)
4837 goto out;
4838 }
4839
4840 out:
4841 mutex_unlock(&lock);
4842 return ret;
4843 }
4844
4845 static struct notifier_block cma_nb = {
4846 .notifier_call = cma_netdev_callback
4847 };
4848
cma_send_device_removal_put(struct rdma_id_private * id_priv)4849 static void cma_send_device_removal_put(struct rdma_id_private *id_priv)
4850 {
4851 struct rdma_cm_event event = { .event = RDMA_CM_EVENT_DEVICE_REMOVAL };
4852 enum rdma_cm_state state;
4853 unsigned long flags;
4854
4855 mutex_lock(&id_priv->handler_mutex);
4856 /* Record that we want to remove the device */
4857 spin_lock_irqsave(&id_priv->lock, flags);
4858 state = id_priv->state;
4859 if (state == RDMA_CM_DESTROYING || state == RDMA_CM_DEVICE_REMOVAL) {
4860 spin_unlock_irqrestore(&id_priv->lock, flags);
4861 mutex_unlock(&id_priv->handler_mutex);
4862 cma_id_put(id_priv);
4863 return;
4864 }
4865 id_priv->state = RDMA_CM_DEVICE_REMOVAL;
4866 spin_unlock_irqrestore(&id_priv->lock, flags);
4867
4868 if (cma_cm_event_handler(id_priv, &event)) {
4869 /*
4870 * At this point the ULP promises it won't call
4871 * rdma_destroy_id() concurrently
4872 */
4873 cma_id_put(id_priv);
4874 mutex_unlock(&id_priv->handler_mutex);
4875 trace_cm_id_destroy(id_priv);
4876 _destroy_id(id_priv, state);
4877 return;
4878 }
4879 mutex_unlock(&id_priv->handler_mutex);
4880
4881 /*
4882 * If this races with destroy then the thread that first assigns state
4883 * to a destroying does the cancel.
4884 */
4885 cma_cancel_operation(id_priv, state);
4886 cma_id_put(id_priv);
4887 }
4888
cma_process_remove(struct cma_device * cma_dev)4889 static void cma_process_remove(struct cma_device *cma_dev)
4890 {
4891 mutex_lock(&lock);
4892 while (!list_empty(&cma_dev->id_list)) {
4893 struct rdma_id_private *id_priv = list_first_entry(
4894 &cma_dev->id_list, struct rdma_id_private, list);
4895
4896 list_del(&id_priv->listen_list);
4897 list_del_init(&id_priv->list);
4898 cma_id_get(id_priv);
4899 mutex_unlock(&lock);
4900
4901 cma_send_device_removal_put(id_priv);
4902
4903 mutex_lock(&lock);
4904 }
4905 mutex_unlock(&lock);
4906
4907 cma_dev_put(cma_dev);
4908 wait_for_completion(&cma_dev->comp);
4909 }
4910
cma_supported(struct ib_device * device)4911 static bool cma_supported(struct ib_device *device)
4912 {
4913 u32 i;
4914
4915 rdma_for_each_port(device, i) {
4916 if (rdma_cap_ib_cm(device, i) || rdma_cap_iw_cm(device, i))
4917 return true;
4918 }
4919 return false;
4920 }
4921
cma_add_one(struct ib_device * device)4922 static int cma_add_one(struct ib_device *device)
4923 {
4924 struct rdma_id_private *to_destroy;
4925 struct cma_device *cma_dev;
4926 struct rdma_id_private *id_priv;
4927 unsigned long supported_gids = 0;
4928 int ret;
4929 u32 i;
4930
4931 if (!cma_supported(device))
4932 return -EOPNOTSUPP;
4933
4934 cma_dev = kmalloc(sizeof(*cma_dev), GFP_KERNEL);
4935 if (!cma_dev)
4936 return -ENOMEM;
4937
4938 cma_dev->device = device;
4939 cma_dev->default_gid_type = kcalloc(device->phys_port_cnt,
4940 sizeof(*cma_dev->default_gid_type),
4941 GFP_KERNEL);
4942 if (!cma_dev->default_gid_type) {
4943 ret = -ENOMEM;
4944 goto free_cma_dev;
4945 }
4946
4947 cma_dev->default_roce_tos = kcalloc(device->phys_port_cnt,
4948 sizeof(*cma_dev->default_roce_tos),
4949 GFP_KERNEL);
4950 if (!cma_dev->default_roce_tos) {
4951 ret = -ENOMEM;
4952 goto free_gid_type;
4953 }
4954
4955 rdma_for_each_port (device, i) {
4956 supported_gids = roce_gid_type_mask_support(device, i);
4957 WARN_ON(!supported_gids);
4958 if (supported_gids & (1 << CMA_PREFERRED_ROCE_GID_TYPE))
4959 cma_dev->default_gid_type[i - rdma_start_port(device)] =
4960 CMA_PREFERRED_ROCE_GID_TYPE;
4961 else
4962 cma_dev->default_gid_type[i - rdma_start_port(device)] =
4963 find_first_bit(&supported_gids, BITS_PER_LONG);
4964 cma_dev->default_roce_tos[i - rdma_start_port(device)] = 0;
4965 }
4966
4967 init_completion(&cma_dev->comp);
4968 refcount_set(&cma_dev->refcount, 1);
4969 INIT_LIST_HEAD(&cma_dev->id_list);
4970 ib_set_client_data(device, &cma_client, cma_dev);
4971
4972 mutex_lock(&lock);
4973 list_add_tail(&cma_dev->list, &dev_list);
4974 list_for_each_entry(id_priv, &listen_any_list, list) {
4975 ret = cma_listen_on_dev(id_priv, cma_dev, &to_destroy);
4976 if (ret)
4977 goto free_listen;
4978 }
4979 mutex_unlock(&lock);
4980
4981 trace_cm_add_one(device);
4982 return 0;
4983
4984 free_listen:
4985 list_del(&cma_dev->list);
4986 mutex_unlock(&lock);
4987
4988 /* cma_process_remove() will delete to_destroy */
4989 cma_process_remove(cma_dev);
4990 kfree(cma_dev->default_roce_tos);
4991 free_gid_type:
4992 kfree(cma_dev->default_gid_type);
4993
4994 free_cma_dev:
4995 kfree(cma_dev);
4996 return ret;
4997 }
4998
cma_remove_one(struct ib_device * device,void * client_data)4999 static void cma_remove_one(struct ib_device *device, void *client_data)
5000 {
5001 struct cma_device *cma_dev = client_data;
5002
5003 trace_cm_remove_one(device);
5004
5005 mutex_lock(&lock);
5006 list_del(&cma_dev->list);
5007 mutex_unlock(&lock);
5008
5009 cma_process_remove(cma_dev);
5010 kfree(cma_dev->default_roce_tos);
5011 kfree(cma_dev->default_gid_type);
5012 kfree(cma_dev);
5013 }
5014
cma_init_net(struct net * net)5015 static int cma_init_net(struct net *net)
5016 {
5017 struct cma_pernet *pernet = cma_pernet(net);
5018
5019 xa_init(&pernet->tcp_ps);
5020 xa_init(&pernet->udp_ps);
5021 xa_init(&pernet->ipoib_ps);
5022 xa_init(&pernet->ib_ps);
5023
5024 return 0;
5025 }
5026
cma_exit_net(struct net * net)5027 static void cma_exit_net(struct net *net)
5028 {
5029 struct cma_pernet *pernet = cma_pernet(net);
5030
5031 WARN_ON(!xa_empty(&pernet->tcp_ps));
5032 WARN_ON(!xa_empty(&pernet->udp_ps));
5033 WARN_ON(!xa_empty(&pernet->ipoib_ps));
5034 WARN_ON(!xa_empty(&pernet->ib_ps));
5035 }
5036
5037 static struct pernet_operations cma_pernet_operations = {
5038 .init = cma_init_net,
5039 .exit = cma_exit_net,
5040 .id = &cma_pernet_id,
5041 .size = sizeof(struct cma_pernet),
5042 };
5043
cma_init(void)5044 static int __init cma_init(void)
5045 {
5046 int ret;
5047
5048 /*
5049 * There is a rare lock ordering dependency in cma_netdev_callback()
5050 * that only happens when bonding is enabled. Teach lockdep that rtnl
5051 * must never be nested under lock so it can find these without having
5052 * to test with bonding.
5053 */
5054 if (IS_ENABLED(CONFIG_LOCKDEP)) {
5055 rtnl_lock();
5056 mutex_lock(&lock);
5057 mutex_unlock(&lock);
5058 rtnl_unlock();
5059 }
5060
5061 cma_wq = alloc_ordered_workqueue("rdma_cm", WQ_MEM_RECLAIM);
5062 if (!cma_wq)
5063 return -ENOMEM;
5064
5065 ret = register_pernet_subsys(&cma_pernet_operations);
5066 if (ret)
5067 goto err_wq;
5068
5069 ib_sa_register_client(&sa_client);
5070 register_netdevice_notifier(&cma_nb);
5071
5072 ret = ib_register_client(&cma_client);
5073 if (ret)
5074 goto err;
5075
5076 ret = cma_configfs_init();
5077 if (ret)
5078 goto err_ib;
5079
5080 return 0;
5081
5082 err_ib:
5083 ib_unregister_client(&cma_client);
5084 err:
5085 unregister_netdevice_notifier(&cma_nb);
5086 ib_sa_unregister_client(&sa_client);
5087 unregister_pernet_subsys(&cma_pernet_operations);
5088 err_wq:
5089 destroy_workqueue(cma_wq);
5090 return ret;
5091 }
5092
cma_cleanup(void)5093 static void __exit cma_cleanup(void)
5094 {
5095 cma_configfs_exit();
5096 ib_unregister_client(&cma_client);
5097 unregister_netdevice_notifier(&cma_nb);
5098 ib_sa_unregister_client(&sa_client);
5099 unregister_pernet_subsys(&cma_pernet_operations);
5100 destroy_workqueue(cma_wq);
5101 }
5102
5103 module_init(cma_init);
5104 module_exit(cma_cleanup);
5105