xref: /openbmc/linux/drivers/infiniband/core/cma.c (revision 0984d159)
1 /*
2  * Copyright (c) 2005 Voltaire Inc.  All rights reserved.
3  * Copyright (c) 2002-2005, Network Appliance, Inc. All rights reserved.
4  * Copyright (c) 1999-2005, Mellanox Technologies, Inc. All rights reserved.
5  * Copyright (c) 2005-2006 Intel Corporation.  All rights reserved.
6  *
7  * This software is available to you under a choice of one of two
8  * licenses.  You may choose to be licensed under the terms of the GNU
9  * General Public License (GPL) Version 2, available from the file
10  * COPYING in the main directory of this source tree, or the
11  * OpenIB.org BSD license below:
12  *
13  *     Redistribution and use in source and binary forms, with or
14  *     without modification, are permitted provided that the following
15  *     conditions are met:
16  *
17  *      - Redistributions of source code must retain the above
18  *        copyright notice, this list of conditions and the following
19  *        disclaimer.
20  *
21  *      - Redistributions in binary form must reproduce the above
22  *        copyright notice, this list of conditions and the following
23  *        disclaimer in the documentation and/or other materials
24  *        provided with the distribution.
25  *
26  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
27  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
28  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
29  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
30  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
31  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
32  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
33  * SOFTWARE.
34  */
35 
36 #include <linux/completion.h>
37 #include <linux/in.h>
38 #include <linux/in6.h>
39 #include <linux/mutex.h>
40 #include <linux/random.h>
41 #include <linux/igmp.h>
42 #include <linux/idr.h>
43 #include <linux/inetdevice.h>
44 #include <linux/slab.h>
45 #include <linux/module.h>
46 #include <net/route.h>
47 
48 #include <net/net_namespace.h>
49 #include <net/netns/generic.h>
50 #include <net/tcp.h>
51 #include <net/ipv6.h>
52 #include <net/ip_fib.h>
53 #include <net/ip6_route.h>
54 
55 #include <rdma/rdma_cm.h>
56 #include <rdma/rdma_cm_ib.h>
57 #include <rdma/rdma_netlink.h>
58 #include <rdma/ib.h>
59 #include <rdma/ib_cache.h>
60 #include <rdma/ib_cm.h>
61 #include <rdma/ib_sa.h>
62 #include <rdma/iw_cm.h>
63 
64 #include "core_priv.h"
65 
66 MODULE_AUTHOR("Sean Hefty");
67 MODULE_DESCRIPTION("Generic RDMA CM Agent");
68 MODULE_LICENSE("Dual BSD/GPL");
69 
70 #define CMA_CM_RESPONSE_TIMEOUT 20
71 #define CMA_MAX_CM_RETRIES 15
72 #define CMA_CM_MRA_SETTING (IB_CM_MRA_FLAG_DELAY | 24)
73 #define CMA_IBOE_PACKET_LIFETIME 18
74 
75 static const char * const cma_events[] = {
76 	[RDMA_CM_EVENT_ADDR_RESOLVED]	 = "address resolved",
77 	[RDMA_CM_EVENT_ADDR_ERROR]	 = "address error",
78 	[RDMA_CM_EVENT_ROUTE_RESOLVED]	 = "route resolved ",
79 	[RDMA_CM_EVENT_ROUTE_ERROR]	 = "route error",
80 	[RDMA_CM_EVENT_CONNECT_REQUEST]	 = "connect request",
81 	[RDMA_CM_EVENT_CONNECT_RESPONSE] = "connect response",
82 	[RDMA_CM_EVENT_CONNECT_ERROR]	 = "connect error",
83 	[RDMA_CM_EVENT_UNREACHABLE]	 = "unreachable",
84 	[RDMA_CM_EVENT_REJECTED]	 = "rejected",
85 	[RDMA_CM_EVENT_ESTABLISHED]	 = "established",
86 	[RDMA_CM_EVENT_DISCONNECTED]	 = "disconnected",
87 	[RDMA_CM_EVENT_DEVICE_REMOVAL]	 = "device removal",
88 	[RDMA_CM_EVENT_MULTICAST_JOIN]	 = "multicast join",
89 	[RDMA_CM_EVENT_MULTICAST_ERROR]	 = "multicast error",
90 	[RDMA_CM_EVENT_ADDR_CHANGE]	 = "address change",
91 	[RDMA_CM_EVENT_TIMEWAIT_EXIT]	 = "timewait exit",
92 };
93 
94 const char *__attribute_const__ rdma_event_msg(enum rdma_cm_event_type event)
95 {
96 	size_t index = event;
97 
98 	return (index < ARRAY_SIZE(cma_events) && cma_events[index]) ?
99 			cma_events[index] : "unrecognized event";
100 }
101 EXPORT_SYMBOL(rdma_event_msg);
102 
103 static void cma_add_one(struct ib_device *device);
104 static void cma_remove_one(struct ib_device *device, void *client_data);
105 
106 static struct ib_client cma_client = {
107 	.name   = "cma",
108 	.add    = cma_add_one,
109 	.remove = cma_remove_one
110 };
111 
112 static struct ib_sa_client sa_client;
113 static struct rdma_addr_client addr_client;
114 static LIST_HEAD(dev_list);
115 static LIST_HEAD(listen_any_list);
116 static DEFINE_MUTEX(lock);
117 static struct workqueue_struct *cma_wq;
118 static int cma_pernet_id;
119 
120 struct cma_pernet {
121 	struct idr tcp_ps;
122 	struct idr udp_ps;
123 	struct idr ipoib_ps;
124 	struct idr ib_ps;
125 };
126 
127 static struct cma_pernet *cma_pernet(struct net *net)
128 {
129 	return net_generic(net, cma_pernet_id);
130 }
131 
132 static struct idr *cma_pernet_idr(struct net *net, enum rdma_port_space ps)
133 {
134 	struct cma_pernet *pernet = cma_pernet(net);
135 
136 	switch (ps) {
137 	case RDMA_PS_TCP:
138 		return &pernet->tcp_ps;
139 	case RDMA_PS_UDP:
140 		return &pernet->udp_ps;
141 	case RDMA_PS_IPOIB:
142 		return &pernet->ipoib_ps;
143 	case RDMA_PS_IB:
144 		return &pernet->ib_ps;
145 	default:
146 		return NULL;
147 	}
148 }
149 
150 struct cma_device {
151 	struct list_head	list;
152 	struct ib_device	*device;
153 	struct completion	comp;
154 	atomic_t		refcount;
155 	struct list_head	id_list;
156 	enum ib_gid_type	*default_gid_type;
157 };
158 
159 struct rdma_bind_list {
160 	enum rdma_port_space	ps;
161 	struct hlist_head	owners;
162 	unsigned short		port;
163 };
164 
165 static int cma_ps_alloc(struct net *net, enum rdma_port_space ps,
166 			struct rdma_bind_list *bind_list, int snum)
167 {
168 	struct idr *idr = cma_pernet_idr(net, ps);
169 
170 	return idr_alloc(idr, bind_list, snum, snum + 1, GFP_KERNEL);
171 }
172 
173 static struct rdma_bind_list *cma_ps_find(struct net *net,
174 					  enum rdma_port_space ps, int snum)
175 {
176 	struct idr *idr = cma_pernet_idr(net, ps);
177 
178 	return idr_find(idr, snum);
179 }
180 
181 static void cma_ps_remove(struct net *net, enum rdma_port_space ps, int snum)
182 {
183 	struct idr *idr = cma_pernet_idr(net, ps);
184 
185 	idr_remove(idr, snum);
186 }
187 
188 enum {
189 	CMA_OPTION_AFONLY,
190 };
191 
192 void cma_ref_dev(struct cma_device *cma_dev)
193 {
194 	atomic_inc(&cma_dev->refcount);
195 }
196 
197 struct cma_device *cma_enum_devices_by_ibdev(cma_device_filter	filter,
198 					     void		*cookie)
199 {
200 	struct cma_device *cma_dev;
201 	struct cma_device *found_cma_dev = NULL;
202 
203 	mutex_lock(&lock);
204 
205 	list_for_each_entry(cma_dev, &dev_list, list)
206 		if (filter(cma_dev->device, cookie)) {
207 			found_cma_dev = cma_dev;
208 			break;
209 		}
210 
211 	if (found_cma_dev)
212 		cma_ref_dev(found_cma_dev);
213 	mutex_unlock(&lock);
214 	return found_cma_dev;
215 }
216 
217 int cma_get_default_gid_type(struct cma_device *cma_dev,
218 			     unsigned int port)
219 {
220 	if (port < rdma_start_port(cma_dev->device) ||
221 	    port > rdma_end_port(cma_dev->device))
222 		return -EINVAL;
223 
224 	return cma_dev->default_gid_type[port - rdma_start_port(cma_dev->device)];
225 }
226 
227 int cma_set_default_gid_type(struct cma_device *cma_dev,
228 			     unsigned int port,
229 			     enum ib_gid_type default_gid_type)
230 {
231 	unsigned long supported_gids;
232 
233 	if (port < rdma_start_port(cma_dev->device) ||
234 	    port > rdma_end_port(cma_dev->device))
235 		return -EINVAL;
236 
237 	supported_gids = roce_gid_type_mask_support(cma_dev->device, port);
238 
239 	if (!(supported_gids & 1 << default_gid_type))
240 		return -EINVAL;
241 
242 	cma_dev->default_gid_type[port - rdma_start_port(cma_dev->device)] =
243 		default_gid_type;
244 
245 	return 0;
246 }
247 
248 struct ib_device *cma_get_ib_dev(struct cma_device *cma_dev)
249 {
250 	return cma_dev->device;
251 }
252 
253 /*
254  * Device removal can occur at anytime, so we need extra handling to
255  * serialize notifying the user of device removal with other callbacks.
256  * We do this by disabling removal notification while a callback is in process,
257  * and reporting it after the callback completes.
258  */
259 struct rdma_id_private {
260 	struct rdma_cm_id	id;
261 
262 	struct rdma_bind_list	*bind_list;
263 	struct hlist_node	node;
264 	struct list_head	list; /* listen_any_list or cma_device.list */
265 	struct list_head	listen_list; /* per device listens */
266 	struct cma_device	*cma_dev;
267 	struct list_head	mc_list;
268 
269 	int			internal_id;
270 	enum rdma_cm_state	state;
271 	spinlock_t		lock;
272 	struct mutex		qp_mutex;
273 
274 	struct completion	comp;
275 	atomic_t		refcount;
276 	struct mutex		handler_mutex;
277 
278 	int			backlog;
279 	int			timeout_ms;
280 	struct ib_sa_query	*query;
281 	int			query_id;
282 	union {
283 		struct ib_cm_id	*ib;
284 		struct iw_cm_id	*iw;
285 	} cm_id;
286 
287 	u32			seq_num;
288 	u32			qkey;
289 	u32			qp_num;
290 	pid_t			owner;
291 	u32			options;
292 	u8			srq;
293 	u8			tos;
294 	u8			reuseaddr;
295 	u8			afonly;
296 	enum ib_gid_type	gid_type;
297 };
298 
299 struct cma_multicast {
300 	struct rdma_id_private *id_priv;
301 	union {
302 		struct ib_sa_multicast *ib;
303 	} multicast;
304 	struct list_head	list;
305 	void			*context;
306 	struct sockaddr_storage	addr;
307 	struct kref		mcref;
308 	bool			igmp_joined;
309 };
310 
311 struct cma_work {
312 	struct work_struct	work;
313 	struct rdma_id_private	*id;
314 	enum rdma_cm_state	old_state;
315 	enum rdma_cm_state	new_state;
316 	struct rdma_cm_event	event;
317 };
318 
319 struct cma_ndev_work {
320 	struct work_struct	work;
321 	struct rdma_id_private	*id;
322 	struct rdma_cm_event	event;
323 };
324 
325 struct iboe_mcast_work {
326 	struct work_struct	 work;
327 	struct rdma_id_private	*id;
328 	struct cma_multicast	*mc;
329 };
330 
331 union cma_ip_addr {
332 	struct in6_addr ip6;
333 	struct {
334 		__be32 pad[3];
335 		__be32 addr;
336 	} ip4;
337 };
338 
339 struct cma_hdr {
340 	u8 cma_version;
341 	u8 ip_version;	/* IP version: 7:4 */
342 	__be16 port;
343 	union cma_ip_addr src_addr;
344 	union cma_ip_addr dst_addr;
345 };
346 
347 #define CMA_VERSION 0x00
348 
349 struct cma_req_info {
350 	struct ib_device *device;
351 	int port;
352 	union ib_gid local_gid;
353 	__be64 service_id;
354 	u16 pkey;
355 	bool has_gid:1;
356 };
357 
358 static int cma_comp(struct rdma_id_private *id_priv, enum rdma_cm_state comp)
359 {
360 	unsigned long flags;
361 	int ret;
362 
363 	spin_lock_irqsave(&id_priv->lock, flags);
364 	ret = (id_priv->state == comp);
365 	spin_unlock_irqrestore(&id_priv->lock, flags);
366 	return ret;
367 }
368 
369 static int cma_comp_exch(struct rdma_id_private *id_priv,
370 			 enum rdma_cm_state comp, enum rdma_cm_state exch)
371 {
372 	unsigned long flags;
373 	int ret;
374 
375 	spin_lock_irqsave(&id_priv->lock, flags);
376 	if ((ret = (id_priv->state == comp)))
377 		id_priv->state = exch;
378 	spin_unlock_irqrestore(&id_priv->lock, flags);
379 	return ret;
380 }
381 
382 static enum rdma_cm_state cma_exch(struct rdma_id_private *id_priv,
383 				   enum rdma_cm_state exch)
384 {
385 	unsigned long flags;
386 	enum rdma_cm_state old;
387 
388 	spin_lock_irqsave(&id_priv->lock, flags);
389 	old = id_priv->state;
390 	id_priv->state = exch;
391 	spin_unlock_irqrestore(&id_priv->lock, flags);
392 	return old;
393 }
394 
395 static inline u8 cma_get_ip_ver(const struct cma_hdr *hdr)
396 {
397 	return hdr->ip_version >> 4;
398 }
399 
400 static inline void cma_set_ip_ver(struct cma_hdr *hdr, u8 ip_ver)
401 {
402 	hdr->ip_version = (ip_ver << 4) | (hdr->ip_version & 0xF);
403 }
404 
405 static int cma_igmp_send(struct net_device *ndev, union ib_gid *mgid, bool join)
406 {
407 	struct in_device *in_dev = NULL;
408 
409 	if (ndev) {
410 		rtnl_lock();
411 		in_dev = __in_dev_get_rtnl(ndev);
412 		if (in_dev) {
413 			if (join)
414 				ip_mc_inc_group(in_dev,
415 						*(__be32 *)(mgid->raw + 12));
416 			else
417 				ip_mc_dec_group(in_dev,
418 						*(__be32 *)(mgid->raw + 12));
419 		}
420 		rtnl_unlock();
421 	}
422 	return (in_dev) ? 0 : -ENODEV;
423 }
424 
425 static void _cma_attach_to_dev(struct rdma_id_private *id_priv,
426 			       struct cma_device *cma_dev)
427 {
428 	cma_ref_dev(cma_dev);
429 	id_priv->cma_dev = cma_dev;
430 	id_priv->gid_type = 0;
431 	id_priv->id.device = cma_dev->device;
432 	id_priv->id.route.addr.dev_addr.transport =
433 		rdma_node_get_transport(cma_dev->device->node_type);
434 	list_add_tail(&id_priv->list, &cma_dev->id_list);
435 }
436 
437 static void cma_attach_to_dev(struct rdma_id_private *id_priv,
438 			      struct cma_device *cma_dev)
439 {
440 	_cma_attach_to_dev(id_priv, cma_dev);
441 	id_priv->gid_type =
442 		cma_dev->default_gid_type[id_priv->id.port_num -
443 					  rdma_start_port(cma_dev->device)];
444 }
445 
446 void cma_deref_dev(struct cma_device *cma_dev)
447 {
448 	if (atomic_dec_and_test(&cma_dev->refcount))
449 		complete(&cma_dev->comp);
450 }
451 
452 static inline void release_mc(struct kref *kref)
453 {
454 	struct cma_multicast *mc = container_of(kref, struct cma_multicast, mcref);
455 
456 	kfree(mc->multicast.ib);
457 	kfree(mc);
458 }
459 
460 static void cma_release_dev(struct rdma_id_private *id_priv)
461 {
462 	mutex_lock(&lock);
463 	list_del(&id_priv->list);
464 	cma_deref_dev(id_priv->cma_dev);
465 	id_priv->cma_dev = NULL;
466 	mutex_unlock(&lock);
467 }
468 
469 static inline struct sockaddr *cma_src_addr(struct rdma_id_private *id_priv)
470 {
471 	return (struct sockaddr *) &id_priv->id.route.addr.src_addr;
472 }
473 
474 static inline struct sockaddr *cma_dst_addr(struct rdma_id_private *id_priv)
475 {
476 	return (struct sockaddr *) &id_priv->id.route.addr.dst_addr;
477 }
478 
479 static inline unsigned short cma_family(struct rdma_id_private *id_priv)
480 {
481 	return id_priv->id.route.addr.src_addr.ss_family;
482 }
483 
484 static int cma_set_qkey(struct rdma_id_private *id_priv, u32 qkey)
485 {
486 	struct ib_sa_mcmember_rec rec;
487 	int ret = 0;
488 
489 	if (id_priv->qkey) {
490 		if (qkey && id_priv->qkey != qkey)
491 			return -EINVAL;
492 		return 0;
493 	}
494 
495 	if (qkey) {
496 		id_priv->qkey = qkey;
497 		return 0;
498 	}
499 
500 	switch (id_priv->id.ps) {
501 	case RDMA_PS_UDP:
502 	case RDMA_PS_IB:
503 		id_priv->qkey = RDMA_UDP_QKEY;
504 		break;
505 	case RDMA_PS_IPOIB:
506 		ib_addr_get_mgid(&id_priv->id.route.addr.dev_addr, &rec.mgid);
507 		ret = ib_sa_get_mcmember_rec(id_priv->id.device,
508 					     id_priv->id.port_num, &rec.mgid,
509 					     &rec);
510 		if (!ret)
511 			id_priv->qkey = be32_to_cpu(rec.qkey);
512 		break;
513 	default:
514 		break;
515 	}
516 	return ret;
517 }
518 
519 static void cma_translate_ib(struct sockaddr_ib *sib, struct rdma_dev_addr *dev_addr)
520 {
521 	dev_addr->dev_type = ARPHRD_INFINIBAND;
522 	rdma_addr_set_sgid(dev_addr, (union ib_gid *) &sib->sib_addr);
523 	ib_addr_set_pkey(dev_addr, ntohs(sib->sib_pkey));
524 }
525 
526 static int cma_translate_addr(struct sockaddr *addr, struct rdma_dev_addr *dev_addr)
527 {
528 	int ret;
529 
530 	if (addr->sa_family != AF_IB) {
531 		ret = rdma_translate_ip(addr, dev_addr, NULL);
532 	} else {
533 		cma_translate_ib((struct sockaddr_ib *) addr, dev_addr);
534 		ret = 0;
535 	}
536 
537 	return ret;
538 }
539 
540 static inline int cma_validate_port(struct ib_device *device, u8 port,
541 				    enum ib_gid_type gid_type,
542 				      union ib_gid *gid, int dev_type,
543 				      int bound_if_index)
544 {
545 	int ret = -ENODEV;
546 	struct net_device *ndev = NULL;
547 
548 	if ((dev_type == ARPHRD_INFINIBAND) && !rdma_protocol_ib(device, port))
549 		return ret;
550 
551 	if ((dev_type != ARPHRD_INFINIBAND) && rdma_protocol_ib(device, port))
552 		return ret;
553 
554 	if (dev_type == ARPHRD_ETHER && rdma_protocol_roce(device, port)) {
555 		ndev = dev_get_by_index(&init_net, bound_if_index);
556 		if (ndev && ndev->flags & IFF_LOOPBACK) {
557 			pr_info("detected loopback device\n");
558 			dev_put(ndev);
559 
560 			if (!device->get_netdev)
561 				return -EOPNOTSUPP;
562 
563 			ndev = device->get_netdev(device, port);
564 			if (!ndev)
565 				return -ENODEV;
566 		}
567 	} else {
568 		gid_type = IB_GID_TYPE_IB;
569 	}
570 
571 	ret = ib_find_cached_gid_by_port(device, gid, gid_type, port,
572 					 ndev, NULL);
573 
574 	if (ndev)
575 		dev_put(ndev);
576 
577 	return ret;
578 }
579 
580 static int cma_acquire_dev(struct rdma_id_private *id_priv,
581 			   struct rdma_id_private *listen_id_priv)
582 {
583 	struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
584 	struct cma_device *cma_dev;
585 	union ib_gid gid, iboe_gid, *gidp;
586 	int ret = -ENODEV;
587 	u8 port;
588 
589 	if (dev_addr->dev_type != ARPHRD_INFINIBAND &&
590 	    id_priv->id.ps == RDMA_PS_IPOIB)
591 		return -EINVAL;
592 
593 	mutex_lock(&lock);
594 	rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
595 		    &iboe_gid);
596 
597 	memcpy(&gid, dev_addr->src_dev_addr +
598 	       rdma_addr_gid_offset(dev_addr), sizeof gid);
599 
600 	if (listen_id_priv) {
601 		cma_dev = listen_id_priv->cma_dev;
602 		port = listen_id_priv->id.port_num;
603 		gidp = rdma_protocol_roce(cma_dev->device, port) ?
604 		       &iboe_gid : &gid;
605 
606 		ret = cma_validate_port(cma_dev->device, port,
607 					rdma_protocol_ib(cma_dev->device, port) ?
608 					IB_GID_TYPE_IB :
609 					listen_id_priv->gid_type, gidp,
610 					dev_addr->dev_type,
611 					dev_addr->bound_dev_if);
612 		if (!ret) {
613 			id_priv->id.port_num = port;
614 			goto out;
615 		}
616 	}
617 
618 	list_for_each_entry(cma_dev, &dev_list, list) {
619 		for (port = 1; port <= cma_dev->device->phys_port_cnt; ++port) {
620 			if (listen_id_priv &&
621 			    listen_id_priv->cma_dev == cma_dev &&
622 			    listen_id_priv->id.port_num == port)
623 				continue;
624 
625 			gidp = rdma_protocol_roce(cma_dev->device, port) ?
626 			       &iboe_gid : &gid;
627 
628 			ret = cma_validate_port(cma_dev->device, port,
629 						rdma_protocol_ib(cma_dev->device, port) ?
630 						IB_GID_TYPE_IB :
631 						cma_dev->default_gid_type[port - 1],
632 						gidp, dev_addr->dev_type,
633 						dev_addr->bound_dev_if);
634 			if (!ret) {
635 				id_priv->id.port_num = port;
636 				goto out;
637 			}
638 		}
639 	}
640 
641 out:
642 	if (!ret)
643 		cma_attach_to_dev(id_priv, cma_dev);
644 
645 	mutex_unlock(&lock);
646 	return ret;
647 }
648 
649 /*
650  * Select the source IB device and address to reach the destination IB address.
651  */
652 static int cma_resolve_ib_dev(struct rdma_id_private *id_priv)
653 {
654 	struct cma_device *cma_dev, *cur_dev;
655 	struct sockaddr_ib *addr;
656 	union ib_gid gid, sgid, *dgid;
657 	u16 pkey, index;
658 	u8 p;
659 	int i;
660 
661 	cma_dev = NULL;
662 	addr = (struct sockaddr_ib *) cma_dst_addr(id_priv);
663 	dgid = (union ib_gid *) &addr->sib_addr;
664 	pkey = ntohs(addr->sib_pkey);
665 
666 	list_for_each_entry(cur_dev, &dev_list, list) {
667 		for (p = 1; p <= cur_dev->device->phys_port_cnt; ++p) {
668 			if (!rdma_cap_af_ib(cur_dev->device, p))
669 				continue;
670 
671 			if (ib_find_cached_pkey(cur_dev->device, p, pkey, &index))
672 				continue;
673 
674 			for (i = 0; !ib_get_cached_gid(cur_dev->device, p, i,
675 						       &gid, NULL);
676 			     i++) {
677 				if (!memcmp(&gid, dgid, sizeof(gid))) {
678 					cma_dev = cur_dev;
679 					sgid = gid;
680 					id_priv->id.port_num = p;
681 					goto found;
682 				}
683 
684 				if (!cma_dev && (gid.global.subnet_prefix ==
685 						 dgid->global.subnet_prefix)) {
686 					cma_dev = cur_dev;
687 					sgid = gid;
688 					id_priv->id.port_num = p;
689 				}
690 			}
691 		}
692 	}
693 
694 	if (!cma_dev)
695 		return -ENODEV;
696 
697 found:
698 	cma_attach_to_dev(id_priv, cma_dev);
699 	addr = (struct sockaddr_ib *) cma_src_addr(id_priv);
700 	memcpy(&addr->sib_addr, &sgid, sizeof sgid);
701 	cma_translate_ib(addr, &id_priv->id.route.addr.dev_addr);
702 	return 0;
703 }
704 
705 static void cma_deref_id(struct rdma_id_private *id_priv)
706 {
707 	if (atomic_dec_and_test(&id_priv->refcount))
708 		complete(&id_priv->comp);
709 }
710 
711 struct rdma_cm_id *rdma_create_id(struct net *net,
712 				  rdma_cm_event_handler event_handler,
713 				  void *context, enum rdma_port_space ps,
714 				  enum ib_qp_type qp_type)
715 {
716 	struct rdma_id_private *id_priv;
717 
718 	id_priv = kzalloc(sizeof *id_priv, GFP_KERNEL);
719 	if (!id_priv)
720 		return ERR_PTR(-ENOMEM);
721 
722 	id_priv->owner = task_pid_nr(current);
723 	id_priv->state = RDMA_CM_IDLE;
724 	id_priv->id.context = context;
725 	id_priv->id.event_handler = event_handler;
726 	id_priv->id.ps = ps;
727 	id_priv->id.qp_type = qp_type;
728 	spin_lock_init(&id_priv->lock);
729 	mutex_init(&id_priv->qp_mutex);
730 	init_completion(&id_priv->comp);
731 	atomic_set(&id_priv->refcount, 1);
732 	mutex_init(&id_priv->handler_mutex);
733 	INIT_LIST_HEAD(&id_priv->listen_list);
734 	INIT_LIST_HEAD(&id_priv->mc_list);
735 	get_random_bytes(&id_priv->seq_num, sizeof id_priv->seq_num);
736 	id_priv->id.route.addr.dev_addr.net = get_net(net);
737 
738 	return &id_priv->id;
739 }
740 EXPORT_SYMBOL(rdma_create_id);
741 
742 static int cma_init_ud_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
743 {
744 	struct ib_qp_attr qp_attr;
745 	int qp_attr_mask, ret;
746 
747 	qp_attr.qp_state = IB_QPS_INIT;
748 	ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
749 	if (ret)
750 		return ret;
751 
752 	ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
753 	if (ret)
754 		return ret;
755 
756 	qp_attr.qp_state = IB_QPS_RTR;
757 	ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE);
758 	if (ret)
759 		return ret;
760 
761 	qp_attr.qp_state = IB_QPS_RTS;
762 	qp_attr.sq_psn = 0;
763 	ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE | IB_QP_SQ_PSN);
764 
765 	return ret;
766 }
767 
768 static int cma_init_conn_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
769 {
770 	struct ib_qp_attr qp_attr;
771 	int qp_attr_mask, ret;
772 
773 	qp_attr.qp_state = IB_QPS_INIT;
774 	ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
775 	if (ret)
776 		return ret;
777 
778 	return ib_modify_qp(qp, &qp_attr, qp_attr_mask);
779 }
780 
781 int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd,
782 		   struct ib_qp_init_attr *qp_init_attr)
783 {
784 	struct rdma_id_private *id_priv;
785 	struct ib_qp *qp;
786 	int ret;
787 
788 	id_priv = container_of(id, struct rdma_id_private, id);
789 	if (id->device != pd->device)
790 		return -EINVAL;
791 
792 	qp_init_attr->port_num = id->port_num;
793 	qp = ib_create_qp(pd, qp_init_attr);
794 	if (IS_ERR(qp))
795 		return PTR_ERR(qp);
796 
797 	if (id->qp_type == IB_QPT_UD)
798 		ret = cma_init_ud_qp(id_priv, qp);
799 	else
800 		ret = cma_init_conn_qp(id_priv, qp);
801 	if (ret)
802 		goto err;
803 
804 	id->qp = qp;
805 	id_priv->qp_num = qp->qp_num;
806 	id_priv->srq = (qp->srq != NULL);
807 	return 0;
808 err:
809 	ib_destroy_qp(qp);
810 	return ret;
811 }
812 EXPORT_SYMBOL(rdma_create_qp);
813 
814 void rdma_destroy_qp(struct rdma_cm_id *id)
815 {
816 	struct rdma_id_private *id_priv;
817 
818 	id_priv = container_of(id, struct rdma_id_private, id);
819 	mutex_lock(&id_priv->qp_mutex);
820 	ib_destroy_qp(id_priv->id.qp);
821 	id_priv->id.qp = NULL;
822 	mutex_unlock(&id_priv->qp_mutex);
823 }
824 EXPORT_SYMBOL(rdma_destroy_qp);
825 
826 static int cma_modify_qp_rtr(struct rdma_id_private *id_priv,
827 			     struct rdma_conn_param *conn_param)
828 {
829 	struct ib_qp_attr qp_attr;
830 	int qp_attr_mask, ret;
831 	union ib_gid sgid;
832 
833 	mutex_lock(&id_priv->qp_mutex);
834 	if (!id_priv->id.qp) {
835 		ret = 0;
836 		goto out;
837 	}
838 
839 	/* Need to update QP attributes from default values. */
840 	qp_attr.qp_state = IB_QPS_INIT;
841 	ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
842 	if (ret)
843 		goto out;
844 
845 	ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
846 	if (ret)
847 		goto out;
848 
849 	qp_attr.qp_state = IB_QPS_RTR;
850 	ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
851 	if (ret)
852 		goto out;
853 
854 	ret = ib_query_gid(id_priv->id.device, id_priv->id.port_num,
855 			   qp_attr.ah_attr.grh.sgid_index, &sgid, NULL);
856 	if (ret)
857 		goto out;
858 
859 	BUG_ON(id_priv->cma_dev->device != id_priv->id.device);
860 
861 	if (conn_param)
862 		qp_attr.max_dest_rd_atomic = conn_param->responder_resources;
863 	ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
864 out:
865 	mutex_unlock(&id_priv->qp_mutex);
866 	return ret;
867 }
868 
869 static int cma_modify_qp_rts(struct rdma_id_private *id_priv,
870 			     struct rdma_conn_param *conn_param)
871 {
872 	struct ib_qp_attr qp_attr;
873 	int qp_attr_mask, ret;
874 
875 	mutex_lock(&id_priv->qp_mutex);
876 	if (!id_priv->id.qp) {
877 		ret = 0;
878 		goto out;
879 	}
880 
881 	qp_attr.qp_state = IB_QPS_RTS;
882 	ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
883 	if (ret)
884 		goto out;
885 
886 	if (conn_param)
887 		qp_attr.max_rd_atomic = conn_param->initiator_depth;
888 	ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
889 out:
890 	mutex_unlock(&id_priv->qp_mutex);
891 	return ret;
892 }
893 
894 static int cma_modify_qp_err(struct rdma_id_private *id_priv)
895 {
896 	struct ib_qp_attr qp_attr;
897 	int ret;
898 
899 	mutex_lock(&id_priv->qp_mutex);
900 	if (!id_priv->id.qp) {
901 		ret = 0;
902 		goto out;
903 	}
904 
905 	qp_attr.qp_state = IB_QPS_ERR;
906 	ret = ib_modify_qp(id_priv->id.qp, &qp_attr, IB_QP_STATE);
907 out:
908 	mutex_unlock(&id_priv->qp_mutex);
909 	return ret;
910 }
911 
912 static int cma_ib_init_qp_attr(struct rdma_id_private *id_priv,
913 			       struct ib_qp_attr *qp_attr, int *qp_attr_mask)
914 {
915 	struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
916 	int ret;
917 	u16 pkey;
918 
919 	if (rdma_cap_eth_ah(id_priv->id.device, id_priv->id.port_num))
920 		pkey = 0xffff;
921 	else
922 		pkey = ib_addr_get_pkey(dev_addr);
923 
924 	ret = ib_find_cached_pkey(id_priv->id.device, id_priv->id.port_num,
925 				  pkey, &qp_attr->pkey_index);
926 	if (ret)
927 		return ret;
928 
929 	qp_attr->port_num = id_priv->id.port_num;
930 	*qp_attr_mask = IB_QP_STATE | IB_QP_PKEY_INDEX | IB_QP_PORT;
931 
932 	if (id_priv->id.qp_type == IB_QPT_UD) {
933 		ret = cma_set_qkey(id_priv, 0);
934 		if (ret)
935 			return ret;
936 
937 		qp_attr->qkey = id_priv->qkey;
938 		*qp_attr_mask |= IB_QP_QKEY;
939 	} else {
940 		qp_attr->qp_access_flags = 0;
941 		*qp_attr_mask |= IB_QP_ACCESS_FLAGS;
942 	}
943 	return 0;
944 }
945 
946 int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
947 		       int *qp_attr_mask)
948 {
949 	struct rdma_id_private *id_priv;
950 	int ret = 0;
951 
952 	id_priv = container_of(id, struct rdma_id_private, id);
953 	if (rdma_cap_ib_cm(id->device, id->port_num)) {
954 		if (!id_priv->cm_id.ib || (id_priv->id.qp_type == IB_QPT_UD))
955 			ret = cma_ib_init_qp_attr(id_priv, qp_attr, qp_attr_mask);
956 		else
957 			ret = ib_cm_init_qp_attr(id_priv->cm_id.ib, qp_attr,
958 						 qp_attr_mask);
959 
960 		if (qp_attr->qp_state == IB_QPS_RTR)
961 			qp_attr->rq_psn = id_priv->seq_num;
962 	} else if (rdma_cap_iw_cm(id->device, id->port_num)) {
963 		if (!id_priv->cm_id.iw) {
964 			qp_attr->qp_access_flags = 0;
965 			*qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS;
966 		} else
967 			ret = iw_cm_init_qp_attr(id_priv->cm_id.iw, qp_attr,
968 						 qp_attr_mask);
969 	} else
970 		ret = -ENOSYS;
971 
972 	return ret;
973 }
974 EXPORT_SYMBOL(rdma_init_qp_attr);
975 
976 static inline int cma_zero_addr(struct sockaddr *addr)
977 {
978 	switch (addr->sa_family) {
979 	case AF_INET:
980 		return ipv4_is_zeronet(((struct sockaddr_in *)addr)->sin_addr.s_addr);
981 	case AF_INET6:
982 		return ipv6_addr_any(&((struct sockaddr_in6 *) addr)->sin6_addr);
983 	case AF_IB:
984 		return ib_addr_any(&((struct sockaddr_ib *) addr)->sib_addr);
985 	default:
986 		return 0;
987 	}
988 }
989 
990 static inline int cma_loopback_addr(struct sockaddr *addr)
991 {
992 	switch (addr->sa_family) {
993 	case AF_INET:
994 		return ipv4_is_loopback(((struct sockaddr_in *) addr)->sin_addr.s_addr);
995 	case AF_INET6:
996 		return ipv6_addr_loopback(&((struct sockaddr_in6 *) addr)->sin6_addr);
997 	case AF_IB:
998 		return ib_addr_loopback(&((struct sockaddr_ib *) addr)->sib_addr);
999 	default:
1000 		return 0;
1001 	}
1002 }
1003 
1004 static inline int cma_any_addr(struct sockaddr *addr)
1005 {
1006 	return cma_zero_addr(addr) || cma_loopback_addr(addr);
1007 }
1008 
1009 static int cma_addr_cmp(struct sockaddr *src, struct sockaddr *dst)
1010 {
1011 	if (src->sa_family != dst->sa_family)
1012 		return -1;
1013 
1014 	switch (src->sa_family) {
1015 	case AF_INET:
1016 		return ((struct sockaddr_in *) src)->sin_addr.s_addr !=
1017 		       ((struct sockaddr_in *) dst)->sin_addr.s_addr;
1018 	case AF_INET6:
1019 		return ipv6_addr_cmp(&((struct sockaddr_in6 *) src)->sin6_addr,
1020 				     &((struct sockaddr_in6 *) dst)->sin6_addr);
1021 	default:
1022 		return ib_addr_cmp(&((struct sockaddr_ib *) src)->sib_addr,
1023 				   &((struct sockaddr_ib *) dst)->sib_addr);
1024 	}
1025 }
1026 
1027 static __be16 cma_port(struct sockaddr *addr)
1028 {
1029 	struct sockaddr_ib *sib;
1030 
1031 	switch (addr->sa_family) {
1032 	case AF_INET:
1033 		return ((struct sockaddr_in *) addr)->sin_port;
1034 	case AF_INET6:
1035 		return ((struct sockaddr_in6 *) addr)->sin6_port;
1036 	case AF_IB:
1037 		sib = (struct sockaddr_ib *) addr;
1038 		return htons((u16) (be64_to_cpu(sib->sib_sid) &
1039 				    be64_to_cpu(sib->sib_sid_mask)));
1040 	default:
1041 		return 0;
1042 	}
1043 }
1044 
1045 static inline int cma_any_port(struct sockaddr *addr)
1046 {
1047 	return !cma_port(addr);
1048 }
1049 
1050 static void cma_save_ib_info(struct sockaddr *src_addr,
1051 			     struct sockaddr *dst_addr,
1052 			     struct rdma_cm_id *listen_id,
1053 			     struct ib_sa_path_rec *path)
1054 {
1055 	struct sockaddr_ib *listen_ib, *ib;
1056 
1057 	listen_ib = (struct sockaddr_ib *) &listen_id->route.addr.src_addr;
1058 	if (src_addr) {
1059 		ib = (struct sockaddr_ib *)src_addr;
1060 		ib->sib_family = AF_IB;
1061 		if (path) {
1062 			ib->sib_pkey = path->pkey;
1063 			ib->sib_flowinfo = path->flow_label;
1064 			memcpy(&ib->sib_addr, &path->sgid, 16);
1065 			ib->sib_sid = path->service_id;
1066 			ib->sib_scope_id = 0;
1067 		} else {
1068 			ib->sib_pkey = listen_ib->sib_pkey;
1069 			ib->sib_flowinfo = listen_ib->sib_flowinfo;
1070 			ib->sib_addr = listen_ib->sib_addr;
1071 			ib->sib_sid = listen_ib->sib_sid;
1072 			ib->sib_scope_id = listen_ib->sib_scope_id;
1073 		}
1074 		ib->sib_sid_mask = cpu_to_be64(0xffffffffffffffffULL);
1075 	}
1076 	if (dst_addr) {
1077 		ib = (struct sockaddr_ib *)dst_addr;
1078 		ib->sib_family = AF_IB;
1079 		if (path) {
1080 			ib->sib_pkey = path->pkey;
1081 			ib->sib_flowinfo = path->flow_label;
1082 			memcpy(&ib->sib_addr, &path->dgid, 16);
1083 		}
1084 	}
1085 }
1086 
1087 static void cma_save_ip4_info(struct sockaddr *src_addr,
1088 			      struct sockaddr *dst_addr,
1089 			      struct cma_hdr *hdr,
1090 			      __be16 local_port)
1091 {
1092 	struct sockaddr_in *ip4;
1093 
1094 	if (src_addr) {
1095 		ip4 = (struct sockaddr_in *)src_addr;
1096 		ip4->sin_family = AF_INET;
1097 		ip4->sin_addr.s_addr = hdr->dst_addr.ip4.addr;
1098 		ip4->sin_port = local_port;
1099 	}
1100 
1101 	if (dst_addr) {
1102 		ip4 = (struct sockaddr_in *)dst_addr;
1103 		ip4->sin_family = AF_INET;
1104 		ip4->sin_addr.s_addr = hdr->src_addr.ip4.addr;
1105 		ip4->sin_port = hdr->port;
1106 	}
1107 }
1108 
1109 static void cma_save_ip6_info(struct sockaddr *src_addr,
1110 			      struct sockaddr *dst_addr,
1111 			      struct cma_hdr *hdr,
1112 			      __be16 local_port)
1113 {
1114 	struct sockaddr_in6 *ip6;
1115 
1116 	if (src_addr) {
1117 		ip6 = (struct sockaddr_in6 *)src_addr;
1118 		ip6->sin6_family = AF_INET6;
1119 		ip6->sin6_addr = hdr->dst_addr.ip6;
1120 		ip6->sin6_port = local_port;
1121 	}
1122 
1123 	if (dst_addr) {
1124 		ip6 = (struct sockaddr_in6 *)dst_addr;
1125 		ip6->sin6_family = AF_INET6;
1126 		ip6->sin6_addr = hdr->src_addr.ip6;
1127 		ip6->sin6_port = hdr->port;
1128 	}
1129 }
1130 
1131 static u16 cma_port_from_service_id(__be64 service_id)
1132 {
1133 	return (u16)be64_to_cpu(service_id);
1134 }
1135 
1136 static int cma_save_ip_info(struct sockaddr *src_addr,
1137 			    struct sockaddr *dst_addr,
1138 			    struct ib_cm_event *ib_event,
1139 			    __be64 service_id)
1140 {
1141 	struct cma_hdr *hdr;
1142 	__be16 port;
1143 
1144 	hdr = ib_event->private_data;
1145 	if (hdr->cma_version != CMA_VERSION)
1146 		return -EINVAL;
1147 
1148 	port = htons(cma_port_from_service_id(service_id));
1149 
1150 	switch (cma_get_ip_ver(hdr)) {
1151 	case 4:
1152 		cma_save_ip4_info(src_addr, dst_addr, hdr, port);
1153 		break;
1154 	case 6:
1155 		cma_save_ip6_info(src_addr, dst_addr, hdr, port);
1156 		break;
1157 	default:
1158 		return -EAFNOSUPPORT;
1159 	}
1160 
1161 	return 0;
1162 }
1163 
1164 static int cma_save_net_info(struct sockaddr *src_addr,
1165 			     struct sockaddr *dst_addr,
1166 			     struct rdma_cm_id *listen_id,
1167 			     struct ib_cm_event *ib_event,
1168 			     sa_family_t sa_family, __be64 service_id)
1169 {
1170 	if (sa_family == AF_IB) {
1171 		if (ib_event->event == IB_CM_REQ_RECEIVED)
1172 			cma_save_ib_info(src_addr, dst_addr, listen_id,
1173 					 ib_event->param.req_rcvd.primary_path);
1174 		else if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED)
1175 			cma_save_ib_info(src_addr, dst_addr, listen_id, NULL);
1176 		return 0;
1177 	}
1178 
1179 	return cma_save_ip_info(src_addr, dst_addr, ib_event, service_id);
1180 }
1181 
1182 static int cma_save_req_info(const struct ib_cm_event *ib_event,
1183 			     struct cma_req_info *req)
1184 {
1185 	const struct ib_cm_req_event_param *req_param =
1186 		&ib_event->param.req_rcvd;
1187 	const struct ib_cm_sidr_req_event_param *sidr_param =
1188 		&ib_event->param.sidr_req_rcvd;
1189 
1190 	switch (ib_event->event) {
1191 	case IB_CM_REQ_RECEIVED:
1192 		req->device	= req_param->listen_id->device;
1193 		req->port	= req_param->port;
1194 		memcpy(&req->local_gid, &req_param->primary_path->sgid,
1195 		       sizeof(req->local_gid));
1196 		req->has_gid	= true;
1197 		req->service_id	= req_param->primary_path->service_id;
1198 		req->pkey	= be16_to_cpu(req_param->primary_path->pkey);
1199 		if (req->pkey != req_param->bth_pkey)
1200 			pr_warn_ratelimited("RDMA CMA: got different BTH P_Key (0x%x) and primary path P_Key (0x%x)\n"
1201 					    "RDMA CMA: in the future this may cause the request to be dropped\n",
1202 					    req_param->bth_pkey, req->pkey);
1203 		break;
1204 	case IB_CM_SIDR_REQ_RECEIVED:
1205 		req->device	= sidr_param->listen_id->device;
1206 		req->port	= sidr_param->port;
1207 		req->has_gid	= false;
1208 		req->service_id	= sidr_param->service_id;
1209 		req->pkey	= sidr_param->pkey;
1210 		if (req->pkey != sidr_param->bth_pkey)
1211 			pr_warn_ratelimited("RDMA CMA: got different BTH P_Key (0x%x) and SIDR request payload P_Key (0x%x)\n"
1212 					    "RDMA CMA: in the future this may cause the request to be dropped\n",
1213 					    sidr_param->bth_pkey, req->pkey);
1214 		break;
1215 	default:
1216 		return -EINVAL;
1217 	}
1218 
1219 	return 0;
1220 }
1221 
1222 static bool validate_ipv4_net_dev(struct net_device *net_dev,
1223 				  const struct sockaddr_in *dst_addr,
1224 				  const struct sockaddr_in *src_addr)
1225 {
1226 	__be32 daddr = dst_addr->sin_addr.s_addr,
1227 	       saddr = src_addr->sin_addr.s_addr;
1228 	struct fib_result res;
1229 	struct flowi4 fl4;
1230 	int err;
1231 	bool ret;
1232 
1233 	if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) ||
1234 	    ipv4_is_lbcast(daddr) || ipv4_is_zeronet(saddr) ||
1235 	    ipv4_is_zeronet(daddr) || ipv4_is_loopback(daddr) ||
1236 	    ipv4_is_loopback(saddr))
1237 		return false;
1238 
1239 	memset(&fl4, 0, sizeof(fl4));
1240 	fl4.flowi4_iif = net_dev->ifindex;
1241 	fl4.daddr = daddr;
1242 	fl4.saddr = saddr;
1243 
1244 	rcu_read_lock();
1245 	err = fib_lookup(dev_net(net_dev), &fl4, &res, 0);
1246 	ret = err == 0 && FIB_RES_DEV(res) == net_dev;
1247 	rcu_read_unlock();
1248 
1249 	return ret;
1250 }
1251 
1252 static bool validate_ipv6_net_dev(struct net_device *net_dev,
1253 				  const struct sockaddr_in6 *dst_addr,
1254 				  const struct sockaddr_in6 *src_addr)
1255 {
1256 #if IS_ENABLED(CONFIG_IPV6)
1257 	const int strict = ipv6_addr_type(&dst_addr->sin6_addr) &
1258 			   IPV6_ADDR_LINKLOCAL;
1259 	struct rt6_info *rt = rt6_lookup(dev_net(net_dev), &dst_addr->sin6_addr,
1260 					 &src_addr->sin6_addr, net_dev->ifindex,
1261 					 strict);
1262 	bool ret;
1263 
1264 	if (!rt)
1265 		return false;
1266 
1267 	ret = rt->rt6i_idev->dev == net_dev;
1268 	ip6_rt_put(rt);
1269 
1270 	return ret;
1271 #else
1272 	return false;
1273 #endif
1274 }
1275 
1276 static bool validate_net_dev(struct net_device *net_dev,
1277 			     const struct sockaddr *daddr,
1278 			     const struct sockaddr *saddr)
1279 {
1280 	const struct sockaddr_in *daddr4 = (const struct sockaddr_in *)daddr;
1281 	const struct sockaddr_in *saddr4 = (const struct sockaddr_in *)saddr;
1282 	const struct sockaddr_in6 *daddr6 = (const struct sockaddr_in6 *)daddr;
1283 	const struct sockaddr_in6 *saddr6 = (const struct sockaddr_in6 *)saddr;
1284 
1285 	switch (daddr->sa_family) {
1286 	case AF_INET:
1287 		return saddr->sa_family == AF_INET &&
1288 		       validate_ipv4_net_dev(net_dev, daddr4, saddr4);
1289 
1290 	case AF_INET6:
1291 		return saddr->sa_family == AF_INET6 &&
1292 		       validate_ipv6_net_dev(net_dev, daddr6, saddr6);
1293 
1294 	default:
1295 		return false;
1296 	}
1297 }
1298 
1299 static struct net_device *cma_get_net_dev(struct ib_cm_event *ib_event,
1300 					  const struct cma_req_info *req)
1301 {
1302 	struct sockaddr_storage listen_addr_storage, src_addr_storage;
1303 	struct sockaddr *listen_addr = (struct sockaddr *)&listen_addr_storage,
1304 			*src_addr = (struct sockaddr *)&src_addr_storage;
1305 	struct net_device *net_dev;
1306 	const union ib_gid *gid = req->has_gid ? &req->local_gid : NULL;
1307 	int err;
1308 
1309 	err = cma_save_ip_info(listen_addr, src_addr, ib_event,
1310 			       req->service_id);
1311 	if (err)
1312 		return ERR_PTR(err);
1313 
1314 	net_dev = ib_get_net_dev_by_params(req->device, req->port, req->pkey,
1315 					   gid, listen_addr);
1316 	if (!net_dev)
1317 		return ERR_PTR(-ENODEV);
1318 
1319 	if (!validate_net_dev(net_dev, listen_addr, src_addr)) {
1320 		dev_put(net_dev);
1321 		return ERR_PTR(-EHOSTUNREACH);
1322 	}
1323 
1324 	return net_dev;
1325 }
1326 
1327 static enum rdma_port_space rdma_ps_from_service_id(__be64 service_id)
1328 {
1329 	return (be64_to_cpu(service_id) >> 16) & 0xffff;
1330 }
1331 
1332 static bool cma_match_private_data(struct rdma_id_private *id_priv,
1333 				   const struct cma_hdr *hdr)
1334 {
1335 	struct sockaddr *addr = cma_src_addr(id_priv);
1336 	__be32 ip4_addr;
1337 	struct in6_addr ip6_addr;
1338 
1339 	if (cma_any_addr(addr) && !id_priv->afonly)
1340 		return true;
1341 
1342 	switch (addr->sa_family) {
1343 	case AF_INET:
1344 		ip4_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
1345 		if (cma_get_ip_ver(hdr) != 4)
1346 			return false;
1347 		if (!cma_any_addr(addr) &&
1348 		    hdr->dst_addr.ip4.addr != ip4_addr)
1349 			return false;
1350 		break;
1351 	case AF_INET6:
1352 		ip6_addr = ((struct sockaddr_in6 *)addr)->sin6_addr;
1353 		if (cma_get_ip_ver(hdr) != 6)
1354 			return false;
1355 		if (!cma_any_addr(addr) &&
1356 		    memcmp(&hdr->dst_addr.ip6, &ip6_addr, sizeof(ip6_addr)))
1357 			return false;
1358 		break;
1359 	case AF_IB:
1360 		return true;
1361 	default:
1362 		return false;
1363 	}
1364 
1365 	return true;
1366 }
1367 
1368 static bool cma_protocol_roce_dev_port(struct ib_device *device, int port_num)
1369 {
1370 	enum rdma_link_layer ll = rdma_port_get_link_layer(device, port_num);
1371 	enum rdma_transport_type transport =
1372 		rdma_node_get_transport(device->node_type);
1373 
1374 	return ll == IB_LINK_LAYER_ETHERNET && transport == RDMA_TRANSPORT_IB;
1375 }
1376 
1377 static bool cma_protocol_roce(const struct rdma_cm_id *id)
1378 {
1379 	struct ib_device *device = id->device;
1380 	const int port_num = id->port_num ?: rdma_start_port(device);
1381 
1382 	return cma_protocol_roce_dev_port(device, port_num);
1383 }
1384 
1385 static bool cma_match_net_dev(const struct rdma_cm_id *id,
1386 			      const struct net_device *net_dev,
1387 			      u8 port_num)
1388 {
1389 	const struct rdma_addr *addr = &id->route.addr;
1390 
1391 	if (!net_dev)
1392 		/* This request is an AF_IB request or a RoCE request */
1393 		return (!id->port_num || id->port_num == port_num) &&
1394 		       (addr->src_addr.ss_family == AF_IB ||
1395 			cma_protocol_roce_dev_port(id->device, port_num));
1396 
1397 	return !addr->dev_addr.bound_dev_if ||
1398 	       (net_eq(dev_net(net_dev), addr->dev_addr.net) &&
1399 		addr->dev_addr.bound_dev_if == net_dev->ifindex);
1400 }
1401 
1402 static struct rdma_id_private *cma_find_listener(
1403 		const struct rdma_bind_list *bind_list,
1404 		const struct ib_cm_id *cm_id,
1405 		const struct ib_cm_event *ib_event,
1406 		const struct cma_req_info *req,
1407 		const struct net_device *net_dev)
1408 {
1409 	struct rdma_id_private *id_priv, *id_priv_dev;
1410 
1411 	if (!bind_list)
1412 		return ERR_PTR(-EINVAL);
1413 
1414 	hlist_for_each_entry(id_priv, &bind_list->owners, node) {
1415 		if (cma_match_private_data(id_priv, ib_event->private_data)) {
1416 			if (id_priv->id.device == cm_id->device &&
1417 			    cma_match_net_dev(&id_priv->id, net_dev, req->port))
1418 				return id_priv;
1419 			list_for_each_entry(id_priv_dev,
1420 					    &id_priv->listen_list,
1421 					    listen_list) {
1422 				if (id_priv_dev->id.device == cm_id->device &&
1423 				    cma_match_net_dev(&id_priv_dev->id, net_dev, req->port))
1424 					return id_priv_dev;
1425 			}
1426 		}
1427 	}
1428 
1429 	return ERR_PTR(-EINVAL);
1430 }
1431 
1432 static struct rdma_id_private *cma_id_from_event(struct ib_cm_id *cm_id,
1433 						 struct ib_cm_event *ib_event,
1434 						 struct net_device **net_dev)
1435 {
1436 	struct cma_req_info req;
1437 	struct rdma_bind_list *bind_list;
1438 	struct rdma_id_private *id_priv;
1439 	int err;
1440 
1441 	err = cma_save_req_info(ib_event, &req);
1442 	if (err)
1443 		return ERR_PTR(err);
1444 
1445 	*net_dev = cma_get_net_dev(ib_event, &req);
1446 	if (IS_ERR(*net_dev)) {
1447 		if (PTR_ERR(*net_dev) == -EAFNOSUPPORT) {
1448 			/* Assuming the protocol is AF_IB */
1449 			*net_dev = NULL;
1450 		} else if (cma_protocol_roce_dev_port(req.device, req.port)) {
1451 			/* TODO find the net dev matching the request parameters
1452 			 * through the RoCE GID table */
1453 			*net_dev = NULL;
1454 		} else {
1455 			return ERR_CAST(*net_dev);
1456 		}
1457 	}
1458 
1459 	bind_list = cma_ps_find(*net_dev ? dev_net(*net_dev) : &init_net,
1460 				rdma_ps_from_service_id(req.service_id),
1461 				cma_port_from_service_id(req.service_id));
1462 	id_priv = cma_find_listener(bind_list, cm_id, ib_event, &req, *net_dev);
1463 	if (IS_ERR(id_priv) && *net_dev) {
1464 		dev_put(*net_dev);
1465 		*net_dev = NULL;
1466 	}
1467 
1468 	return id_priv;
1469 }
1470 
1471 static inline int cma_user_data_offset(struct rdma_id_private *id_priv)
1472 {
1473 	return cma_family(id_priv) == AF_IB ? 0 : sizeof(struct cma_hdr);
1474 }
1475 
1476 static void cma_cancel_route(struct rdma_id_private *id_priv)
1477 {
1478 	if (rdma_cap_ib_sa(id_priv->id.device, id_priv->id.port_num)) {
1479 		if (id_priv->query)
1480 			ib_sa_cancel_query(id_priv->query_id, id_priv->query);
1481 	}
1482 }
1483 
1484 static void cma_cancel_listens(struct rdma_id_private *id_priv)
1485 {
1486 	struct rdma_id_private *dev_id_priv;
1487 
1488 	/*
1489 	 * Remove from listen_any_list to prevent added devices from spawning
1490 	 * additional listen requests.
1491 	 */
1492 	mutex_lock(&lock);
1493 	list_del(&id_priv->list);
1494 
1495 	while (!list_empty(&id_priv->listen_list)) {
1496 		dev_id_priv = list_entry(id_priv->listen_list.next,
1497 					 struct rdma_id_private, listen_list);
1498 		/* sync with device removal to avoid duplicate destruction */
1499 		list_del_init(&dev_id_priv->list);
1500 		list_del(&dev_id_priv->listen_list);
1501 		mutex_unlock(&lock);
1502 
1503 		rdma_destroy_id(&dev_id_priv->id);
1504 		mutex_lock(&lock);
1505 	}
1506 	mutex_unlock(&lock);
1507 }
1508 
1509 static void cma_cancel_operation(struct rdma_id_private *id_priv,
1510 				 enum rdma_cm_state state)
1511 {
1512 	switch (state) {
1513 	case RDMA_CM_ADDR_QUERY:
1514 		rdma_addr_cancel(&id_priv->id.route.addr.dev_addr);
1515 		break;
1516 	case RDMA_CM_ROUTE_QUERY:
1517 		cma_cancel_route(id_priv);
1518 		break;
1519 	case RDMA_CM_LISTEN:
1520 		if (cma_any_addr(cma_src_addr(id_priv)) && !id_priv->cma_dev)
1521 			cma_cancel_listens(id_priv);
1522 		break;
1523 	default:
1524 		break;
1525 	}
1526 }
1527 
1528 static void cma_release_port(struct rdma_id_private *id_priv)
1529 {
1530 	struct rdma_bind_list *bind_list = id_priv->bind_list;
1531 	struct net *net = id_priv->id.route.addr.dev_addr.net;
1532 
1533 	if (!bind_list)
1534 		return;
1535 
1536 	mutex_lock(&lock);
1537 	hlist_del(&id_priv->node);
1538 	if (hlist_empty(&bind_list->owners)) {
1539 		cma_ps_remove(net, bind_list->ps, bind_list->port);
1540 		kfree(bind_list);
1541 	}
1542 	mutex_unlock(&lock);
1543 }
1544 
1545 static void cma_leave_mc_groups(struct rdma_id_private *id_priv)
1546 {
1547 	struct cma_multicast *mc;
1548 
1549 	while (!list_empty(&id_priv->mc_list)) {
1550 		mc = container_of(id_priv->mc_list.next,
1551 				  struct cma_multicast, list);
1552 		list_del(&mc->list);
1553 		if (rdma_cap_ib_mcast(id_priv->cma_dev->device,
1554 				      id_priv->id.port_num)) {
1555 			ib_sa_free_multicast(mc->multicast.ib);
1556 			kfree(mc);
1557 		} else {
1558 			if (mc->igmp_joined) {
1559 				struct rdma_dev_addr *dev_addr =
1560 					&id_priv->id.route.addr.dev_addr;
1561 				struct net_device *ndev = NULL;
1562 
1563 				if (dev_addr->bound_dev_if)
1564 					ndev = dev_get_by_index(&init_net,
1565 								dev_addr->bound_dev_if);
1566 				if (ndev) {
1567 					cma_igmp_send(ndev,
1568 						      &mc->multicast.ib->rec.mgid,
1569 						      false);
1570 					dev_put(ndev);
1571 				}
1572 			}
1573 			kref_put(&mc->mcref, release_mc);
1574 		}
1575 	}
1576 }
1577 
1578 void rdma_destroy_id(struct rdma_cm_id *id)
1579 {
1580 	struct rdma_id_private *id_priv;
1581 	enum rdma_cm_state state;
1582 
1583 	id_priv = container_of(id, struct rdma_id_private, id);
1584 	state = cma_exch(id_priv, RDMA_CM_DESTROYING);
1585 	cma_cancel_operation(id_priv, state);
1586 
1587 	/*
1588 	 * Wait for any active callback to finish.  New callbacks will find
1589 	 * the id_priv state set to destroying and abort.
1590 	 */
1591 	mutex_lock(&id_priv->handler_mutex);
1592 	mutex_unlock(&id_priv->handler_mutex);
1593 
1594 	if (id_priv->cma_dev) {
1595 		if (rdma_cap_ib_cm(id_priv->id.device, 1)) {
1596 			if (id_priv->cm_id.ib)
1597 				ib_destroy_cm_id(id_priv->cm_id.ib);
1598 		} else if (rdma_cap_iw_cm(id_priv->id.device, 1)) {
1599 			if (id_priv->cm_id.iw)
1600 				iw_destroy_cm_id(id_priv->cm_id.iw);
1601 		}
1602 		cma_leave_mc_groups(id_priv);
1603 		cma_release_dev(id_priv);
1604 	}
1605 
1606 	cma_release_port(id_priv);
1607 	cma_deref_id(id_priv);
1608 	wait_for_completion(&id_priv->comp);
1609 
1610 	if (id_priv->internal_id)
1611 		cma_deref_id(id_priv->id.context);
1612 
1613 	kfree(id_priv->id.route.path_rec);
1614 	put_net(id_priv->id.route.addr.dev_addr.net);
1615 	kfree(id_priv);
1616 }
1617 EXPORT_SYMBOL(rdma_destroy_id);
1618 
1619 static int cma_rep_recv(struct rdma_id_private *id_priv)
1620 {
1621 	int ret;
1622 
1623 	ret = cma_modify_qp_rtr(id_priv, NULL);
1624 	if (ret)
1625 		goto reject;
1626 
1627 	ret = cma_modify_qp_rts(id_priv, NULL);
1628 	if (ret)
1629 		goto reject;
1630 
1631 	ret = ib_send_cm_rtu(id_priv->cm_id.ib, NULL, 0);
1632 	if (ret)
1633 		goto reject;
1634 
1635 	return 0;
1636 reject:
1637 	cma_modify_qp_err(id_priv);
1638 	ib_send_cm_rej(id_priv->cm_id.ib, IB_CM_REJ_CONSUMER_DEFINED,
1639 		       NULL, 0, NULL, 0);
1640 	return ret;
1641 }
1642 
1643 static void cma_set_rep_event_data(struct rdma_cm_event *event,
1644 				   struct ib_cm_rep_event_param *rep_data,
1645 				   void *private_data)
1646 {
1647 	event->param.conn.private_data = private_data;
1648 	event->param.conn.private_data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
1649 	event->param.conn.responder_resources = rep_data->responder_resources;
1650 	event->param.conn.initiator_depth = rep_data->initiator_depth;
1651 	event->param.conn.flow_control = rep_data->flow_control;
1652 	event->param.conn.rnr_retry_count = rep_data->rnr_retry_count;
1653 	event->param.conn.srq = rep_data->srq;
1654 	event->param.conn.qp_num = rep_data->remote_qpn;
1655 }
1656 
1657 static int cma_ib_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
1658 {
1659 	struct rdma_id_private *id_priv = cm_id->context;
1660 	struct rdma_cm_event event;
1661 	int ret = 0;
1662 
1663 	mutex_lock(&id_priv->handler_mutex);
1664 	if ((ib_event->event != IB_CM_TIMEWAIT_EXIT &&
1665 	     id_priv->state != RDMA_CM_CONNECT) ||
1666 	    (ib_event->event == IB_CM_TIMEWAIT_EXIT &&
1667 	     id_priv->state != RDMA_CM_DISCONNECT))
1668 		goto out;
1669 
1670 	memset(&event, 0, sizeof event);
1671 	switch (ib_event->event) {
1672 	case IB_CM_REQ_ERROR:
1673 	case IB_CM_REP_ERROR:
1674 		event.event = RDMA_CM_EVENT_UNREACHABLE;
1675 		event.status = -ETIMEDOUT;
1676 		break;
1677 	case IB_CM_REP_RECEIVED:
1678 		if (id_priv->id.qp) {
1679 			event.status = cma_rep_recv(id_priv);
1680 			event.event = event.status ? RDMA_CM_EVENT_CONNECT_ERROR :
1681 						     RDMA_CM_EVENT_ESTABLISHED;
1682 		} else {
1683 			event.event = RDMA_CM_EVENT_CONNECT_RESPONSE;
1684 		}
1685 		cma_set_rep_event_data(&event, &ib_event->param.rep_rcvd,
1686 				       ib_event->private_data);
1687 		break;
1688 	case IB_CM_RTU_RECEIVED:
1689 	case IB_CM_USER_ESTABLISHED:
1690 		event.event = RDMA_CM_EVENT_ESTABLISHED;
1691 		break;
1692 	case IB_CM_DREQ_ERROR:
1693 		event.status = -ETIMEDOUT; /* fall through */
1694 	case IB_CM_DREQ_RECEIVED:
1695 	case IB_CM_DREP_RECEIVED:
1696 		if (!cma_comp_exch(id_priv, RDMA_CM_CONNECT,
1697 				   RDMA_CM_DISCONNECT))
1698 			goto out;
1699 		event.event = RDMA_CM_EVENT_DISCONNECTED;
1700 		break;
1701 	case IB_CM_TIMEWAIT_EXIT:
1702 		event.event = RDMA_CM_EVENT_TIMEWAIT_EXIT;
1703 		break;
1704 	case IB_CM_MRA_RECEIVED:
1705 		/* ignore event */
1706 		goto out;
1707 	case IB_CM_REJ_RECEIVED:
1708 		cma_modify_qp_err(id_priv);
1709 		event.status = ib_event->param.rej_rcvd.reason;
1710 		event.event = RDMA_CM_EVENT_REJECTED;
1711 		event.param.conn.private_data = ib_event->private_data;
1712 		event.param.conn.private_data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
1713 		break;
1714 	default:
1715 		pr_err("RDMA CMA: unexpected IB CM event: %d\n",
1716 		       ib_event->event);
1717 		goto out;
1718 	}
1719 
1720 	ret = id_priv->id.event_handler(&id_priv->id, &event);
1721 	if (ret) {
1722 		/* Destroy the CM ID by returning a non-zero value. */
1723 		id_priv->cm_id.ib = NULL;
1724 		cma_exch(id_priv, RDMA_CM_DESTROYING);
1725 		mutex_unlock(&id_priv->handler_mutex);
1726 		rdma_destroy_id(&id_priv->id);
1727 		return ret;
1728 	}
1729 out:
1730 	mutex_unlock(&id_priv->handler_mutex);
1731 	return ret;
1732 }
1733 
1734 static struct rdma_id_private *cma_new_conn_id(struct rdma_cm_id *listen_id,
1735 					       struct ib_cm_event *ib_event,
1736 					       struct net_device *net_dev)
1737 {
1738 	struct rdma_id_private *id_priv;
1739 	struct rdma_cm_id *id;
1740 	struct rdma_route *rt;
1741 	const sa_family_t ss_family = listen_id->route.addr.src_addr.ss_family;
1742 	const __be64 service_id =
1743 		      ib_event->param.req_rcvd.primary_path->service_id;
1744 	int ret;
1745 
1746 	id = rdma_create_id(listen_id->route.addr.dev_addr.net,
1747 			    listen_id->event_handler, listen_id->context,
1748 			    listen_id->ps, ib_event->param.req_rcvd.qp_type);
1749 	if (IS_ERR(id))
1750 		return NULL;
1751 
1752 	id_priv = container_of(id, struct rdma_id_private, id);
1753 	if (cma_save_net_info((struct sockaddr *)&id->route.addr.src_addr,
1754 			      (struct sockaddr *)&id->route.addr.dst_addr,
1755 			      listen_id, ib_event, ss_family, service_id))
1756 		goto err;
1757 
1758 	rt = &id->route;
1759 	rt->num_paths = ib_event->param.req_rcvd.alternate_path ? 2 : 1;
1760 	rt->path_rec = kmalloc(sizeof *rt->path_rec * rt->num_paths,
1761 			       GFP_KERNEL);
1762 	if (!rt->path_rec)
1763 		goto err;
1764 
1765 	rt->path_rec[0] = *ib_event->param.req_rcvd.primary_path;
1766 	if (rt->num_paths == 2)
1767 		rt->path_rec[1] = *ib_event->param.req_rcvd.alternate_path;
1768 
1769 	if (net_dev) {
1770 		ret = rdma_copy_addr(&rt->addr.dev_addr, net_dev, NULL);
1771 		if (ret)
1772 			goto err;
1773 	} else {
1774 		if (!cma_protocol_roce(listen_id) &&
1775 		    cma_any_addr(cma_src_addr(id_priv))) {
1776 			rt->addr.dev_addr.dev_type = ARPHRD_INFINIBAND;
1777 			rdma_addr_set_sgid(&rt->addr.dev_addr, &rt->path_rec[0].sgid);
1778 			ib_addr_set_pkey(&rt->addr.dev_addr, be16_to_cpu(rt->path_rec[0].pkey));
1779 		} else if (!cma_any_addr(cma_src_addr(id_priv))) {
1780 			ret = cma_translate_addr(cma_src_addr(id_priv), &rt->addr.dev_addr);
1781 			if (ret)
1782 				goto err;
1783 		}
1784 	}
1785 	rdma_addr_set_dgid(&rt->addr.dev_addr, &rt->path_rec[0].dgid);
1786 
1787 	id_priv->state = RDMA_CM_CONNECT;
1788 	return id_priv;
1789 
1790 err:
1791 	rdma_destroy_id(id);
1792 	return NULL;
1793 }
1794 
1795 static struct rdma_id_private *cma_new_udp_id(struct rdma_cm_id *listen_id,
1796 					      struct ib_cm_event *ib_event,
1797 					      struct net_device *net_dev)
1798 {
1799 	struct rdma_id_private *id_priv;
1800 	struct rdma_cm_id *id;
1801 	const sa_family_t ss_family = listen_id->route.addr.src_addr.ss_family;
1802 	struct net *net = listen_id->route.addr.dev_addr.net;
1803 	int ret;
1804 
1805 	id = rdma_create_id(net, listen_id->event_handler, listen_id->context,
1806 			    listen_id->ps, IB_QPT_UD);
1807 	if (IS_ERR(id))
1808 		return NULL;
1809 
1810 	id_priv = container_of(id, struct rdma_id_private, id);
1811 	if (cma_save_net_info((struct sockaddr *)&id->route.addr.src_addr,
1812 			      (struct sockaddr *)&id->route.addr.dst_addr,
1813 			      listen_id, ib_event, ss_family,
1814 			      ib_event->param.sidr_req_rcvd.service_id))
1815 		goto err;
1816 
1817 	if (net_dev) {
1818 		ret = rdma_copy_addr(&id->route.addr.dev_addr, net_dev, NULL);
1819 		if (ret)
1820 			goto err;
1821 	} else {
1822 		if (!cma_any_addr(cma_src_addr(id_priv))) {
1823 			ret = cma_translate_addr(cma_src_addr(id_priv),
1824 						 &id->route.addr.dev_addr);
1825 			if (ret)
1826 				goto err;
1827 		}
1828 	}
1829 
1830 	id_priv->state = RDMA_CM_CONNECT;
1831 	return id_priv;
1832 err:
1833 	rdma_destroy_id(id);
1834 	return NULL;
1835 }
1836 
1837 static void cma_set_req_event_data(struct rdma_cm_event *event,
1838 				   struct ib_cm_req_event_param *req_data,
1839 				   void *private_data, int offset)
1840 {
1841 	event->param.conn.private_data = private_data + offset;
1842 	event->param.conn.private_data_len = IB_CM_REQ_PRIVATE_DATA_SIZE - offset;
1843 	event->param.conn.responder_resources = req_data->responder_resources;
1844 	event->param.conn.initiator_depth = req_data->initiator_depth;
1845 	event->param.conn.flow_control = req_data->flow_control;
1846 	event->param.conn.retry_count = req_data->retry_count;
1847 	event->param.conn.rnr_retry_count = req_data->rnr_retry_count;
1848 	event->param.conn.srq = req_data->srq;
1849 	event->param.conn.qp_num = req_data->remote_qpn;
1850 }
1851 
1852 static int cma_check_req_qp_type(struct rdma_cm_id *id, struct ib_cm_event *ib_event)
1853 {
1854 	return (((ib_event->event == IB_CM_REQ_RECEIVED) &&
1855 		 (ib_event->param.req_rcvd.qp_type == id->qp_type)) ||
1856 		((ib_event->event == IB_CM_SIDR_REQ_RECEIVED) &&
1857 		 (id->qp_type == IB_QPT_UD)) ||
1858 		(!id->qp_type));
1859 }
1860 
1861 static int cma_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
1862 {
1863 	struct rdma_id_private *listen_id, *conn_id = NULL;
1864 	struct rdma_cm_event event;
1865 	struct net_device *net_dev;
1866 	int offset, ret;
1867 
1868 	listen_id = cma_id_from_event(cm_id, ib_event, &net_dev);
1869 	if (IS_ERR(listen_id))
1870 		return PTR_ERR(listen_id);
1871 
1872 	if (!cma_check_req_qp_type(&listen_id->id, ib_event)) {
1873 		ret = -EINVAL;
1874 		goto net_dev_put;
1875 	}
1876 
1877 	mutex_lock(&listen_id->handler_mutex);
1878 	if (listen_id->state != RDMA_CM_LISTEN) {
1879 		ret = -ECONNABORTED;
1880 		goto err1;
1881 	}
1882 
1883 	memset(&event, 0, sizeof event);
1884 	offset = cma_user_data_offset(listen_id);
1885 	event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
1886 	if (ib_event->event == IB_CM_SIDR_REQ_RECEIVED) {
1887 		conn_id = cma_new_udp_id(&listen_id->id, ib_event, net_dev);
1888 		event.param.ud.private_data = ib_event->private_data + offset;
1889 		event.param.ud.private_data_len =
1890 				IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE - offset;
1891 	} else {
1892 		conn_id = cma_new_conn_id(&listen_id->id, ib_event, net_dev);
1893 		cma_set_req_event_data(&event, &ib_event->param.req_rcvd,
1894 				       ib_event->private_data, offset);
1895 	}
1896 	if (!conn_id) {
1897 		ret = -ENOMEM;
1898 		goto err1;
1899 	}
1900 
1901 	mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
1902 	ret = cma_acquire_dev(conn_id, listen_id);
1903 	if (ret)
1904 		goto err2;
1905 
1906 	conn_id->cm_id.ib = cm_id;
1907 	cm_id->context = conn_id;
1908 	cm_id->cm_handler = cma_ib_handler;
1909 
1910 	/*
1911 	 * Protect against the user destroying conn_id from another thread
1912 	 * until we're done accessing it.
1913 	 */
1914 	atomic_inc(&conn_id->refcount);
1915 	ret = conn_id->id.event_handler(&conn_id->id, &event);
1916 	if (ret)
1917 		goto err3;
1918 	/*
1919 	 * Acquire mutex to prevent user executing rdma_destroy_id()
1920 	 * while we're accessing the cm_id.
1921 	 */
1922 	mutex_lock(&lock);
1923 	if (cma_comp(conn_id, RDMA_CM_CONNECT) &&
1924 	    (conn_id->id.qp_type != IB_QPT_UD))
1925 		ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0);
1926 	mutex_unlock(&lock);
1927 	mutex_unlock(&conn_id->handler_mutex);
1928 	mutex_unlock(&listen_id->handler_mutex);
1929 	cma_deref_id(conn_id);
1930 	if (net_dev)
1931 		dev_put(net_dev);
1932 	return 0;
1933 
1934 err3:
1935 	cma_deref_id(conn_id);
1936 	/* Destroy the CM ID by returning a non-zero value. */
1937 	conn_id->cm_id.ib = NULL;
1938 err2:
1939 	cma_exch(conn_id, RDMA_CM_DESTROYING);
1940 	mutex_unlock(&conn_id->handler_mutex);
1941 err1:
1942 	mutex_unlock(&listen_id->handler_mutex);
1943 	if (conn_id)
1944 		rdma_destroy_id(&conn_id->id);
1945 
1946 net_dev_put:
1947 	if (net_dev)
1948 		dev_put(net_dev);
1949 
1950 	return ret;
1951 }
1952 
1953 __be64 rdma_get_service_id(struct rdma_cm_id *id, struct sockaddr *addr)
1954 {
1955 	if (addr->sa_family == AF_IB)
1956 		return ((struct sockaddr_ib *) addr)->sib_sid;
1957 
1958 	return cpu_to_be64(((u64)id->ps << 16) + be16_to_cpu(cma_port(addr)));
1959 }
1960 EXPORT_SYMBOL(rdma_get_service_id);
1961 
1962 static int cma_iw_handler(struct iw_cm_id *iw_id, struct iw_cm_event *iw_event)
1963 {
1964 	struct rdma_id_private *id_priv = iw_id->context;
1965 	struct rdma_cm_event event;
1966 	int ret = 0;
1967 	struct sockaddr *laddr = (struct sockaddr *)&iw_event->local_addr;
1968 	struct sockaddr *raddr = (struct sockaddr *)&iw_event->remote_addr;
1969 
1970 	mutex_lock(&id_priv->handler_mutex);
1971 	if (id_priv->state != RDMA_CM_CONNECT)
1972 		goto out;
1973 
1974 	memset(&event, 0, sizeof event);
1975 	switch (iw_event->event) {
1976 	case IW_CM_EVENT_CLOSE:
1977 		event.event = RDMA_CM_EVENT_DISCONNECTED;
1978 		break;
1979 	case IW_CM_EVENT_CONNECT_REPLY:
1980 		memcpy(cma_src_addr(id_priv), laddr,
1981 		       rdma_addr_size(laddr));
1982 		memcpy(cma_dst_addr(id_priv), raddr,
1983 		       rdma_addr_size(raddr));
1984 		switch (iw_event->status) {
1985 		case 0:
1986 			event.event = RDMA_CM_EVENT_ESTABLISHED;
1987 			event.param.conn.initiator_depth = iw_event->ird;
1988 			event.param.conn.responder_resources = iw_event->ord;
1989 			break;
1990 		case -ECONNRESET:
1991 		case -ECONNREFUSED:
1992 			event.event = RDMA_CM_EVENT_REJECTED;
1993 			break;
1994 		case -ETIMEDOUT:
1995 			event.event = RDMA_CM_EVENT_UNREACHABLE;
1996 			break;
1997 		default:
1998 			event.event = RDMA_CM_EVENT_CONNECT_ERROR;
1999 			break;
2000 		}
2001 		break;
2002 	case IW_CM_EVENT_ESTABLISHED:
2003 		event.event = RDMA_CM_EVENT_ESTABLISHED;
2004 		event.param.conn.initiator_depth = iw_event->ird;
2005 		event.param.conn.responder_resources = iw_event->ord;
2006 		break;
2007 	default:
2008 		BUG_ON(1);
2009 	}
2010 
2011 	event.status = iw_event->status;
2012 	event.param.conn.private_data = iw_event->private_data;
2013 	event.param.conn.private_data_len = iw_event->private_data_len;
2014 	ret = id_priv->id.event_handler(&id_priv->id, &event);
2015 	if (ret) {
2016 		/* Destroy the CM ID by returning a non-zero value. */
2017 		id_priv->cm_id.iw = NULL;
2018 		cma_exch(id_priv, RDMA_CM_DESTROYING);
2019 		mutex_unlock(&id_priv->handler_mutex);
2020 		rdma_destroy_id(&id_priv->id);
2021 		return ret;
2022 	}
2023 
2024 out:
2025 	mutex_unlock(&id_priv->handler_mutex);
2026 	return ret;
2027 }
2028 
2029 static int iw_conn_req_handler(struct iw_cm_id *cm_id,
2030 			       struct iw_cm_event *iw_event)
2031 {
2032 	struct rdma_cm_id *new_cm_id;
2033 	struct rdma_id_private *listen_id, *conn_id;
2034 	struct rdma_cm_event event;
2035 	int ret = -ECONNABORTED;
2036 	struct sockaddr *laddr = (struct sockaddr *)&iw_event->local_addr;
2037 	struct sockaddr *raddr = (struct sockaddr *)&iw_event->remote_addr;
2038 
2039 	listen_id = cm_id->context;
2040 
2041 	mutex_lock(&listen_id->handler_mutex);
2042 	if (listen_id->state != RDMA_CM_LISTEN)
2043 		goto out;
2044 
2045 	/* Create a new RDMA id for the new IW CM ID */
2046 	new_cm_id = rdma_create_id(listen_id->id.route.addr.dev_addr.net,
2047 				   listen_id->id.event_handler,
2048 				   listen_id->id.context,
2049 				   RDMA_PS_TCP, IB_QPT_RC);
2050 	if (IS_ERR(new_cm_id)) {
2051 		ret = -ENOMEM;
2052 		goto out;
2053 	}
2054 	conn_id = container_of(new_cm_id, struct rdma_id_private, id);
2055 	mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
2056 	conn_id->state = RDMA_CM_CONNECT;
2057 
2058 	ret = rdma_translate_ip(laddr, &conn_id->id.route.addr.dev_addr, NULL);
2059 	if (ret) {
2060 		mutex_unlock(&conn_id->handler_mutex);
2061 		rdma_destroy_id(new_cm_id);
2062 		goto out;
2063 	}
2064 
2065 	ret = cma_acquire_dev(conn_id, listen_id);
2066 	if (ret) {
2067 		mutex_unlock(&conn_id->handler_mutex);
2068 		rdma_destroy_id(new_cm_id);
2069 		goto out;
2070 	}
2071 
2072 	conn_id->cm_id.iw = cm_id;
2073 	cm_id->context = conn_id;
2074 	cm_id->cm_handler = cma_iw_handler;
2075 
2076 	memcpy(cma_src_addr(conn_id), laddr, rdma_addr_size(laddr));
2077 	memcpy(cma_dst_addr(conn_id), raddr, rdma_addr_size(raddr));
2078 
2079 	memset(&event, 0, sizeof event);
2080 	event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
2081 	event.param.conn.private_data = iw_event->private_data;
2082 	event.param.conn.private_data_len = iw_event->private_data_len;
2083 	event.param.conn.initiator_depth = iw_event->ird;
2084 	event.param.conn.responder_resources = iw_event->ord;
2085 
2086 	/*
2087 	 * Protect against the user destroying conn_id from another thread
2088 	 * until we're done accessing it.
2089 	 */
2090 	atomic_inc(&conn_id->refcount);
2091 	ret = conn_id->id.event_handler(&conn_id->id, &event);
2092 	if (ret) {
2093 		/* User wants to destroy the CM ID */
2094 		conn_id->cm_id.iw = NULL;
2095 		cma_exch(conn_id, RDMA_CM_DESTROYING);
2096 		mutex_unlock(&conn_id->handler_mutex);
2097 		cma_deref_id(conn_id);
2098 		rdma_destroy_id(&conn_id->id);
2099 		goto out;
2100 	}
2101 
2102 	mutex_unlock(&conn_id->handler_mutex);
2103 	cma_deref_id(conn_id);
2104 
2105 out:
2106 	mutex_unlock(&listen_id->handler_mutex);
2107 	return ret;
2108 }
2109 
2110 static int cma_ib_listen(struct rdma_id_private *id_priv)
2111 {
2112 	struct sockaddr *addr;
2113 	struct ib_cm_id	*id;
2114 	__be64 svc_id;
2115 
2116 	addr = cma_src_addr(id_priv);
2117 	svc_id = rdma_get_service_id(&id_priv->id, addr);
2118 	id = ib_cm_insert_listen(id_priv->id.device, cma_req_handler, svc_id);
2119 	if (IS_ERR(id))
2120 		return PTR_ERR(id);
2121 	id_priv->cm_id.ib = id;
2122 
2123 	return 0;
2124 }
2125 
2126 static int cma_iw_listen(struct rdma_id_private *id_priv, int backlog)
2127 {
2128 	int ret;
2129 	struct iw_cm_id	*id;
2130 
2131 	id = iw_create_cm_id(id_priv->id.device,
2132 			     iw_conn_req_handler,
2133 			     id_priv);
2134 	if (IS_ERR(id))
2135 		return PTR_ERR(id);
2136 
2137 	id->tos = id_priv->tos;
2138 	id_priv->cm_id.iw = id;
2139 
2140 	memcpy(&id_priv->cm_id.iw->local_addr, cma_src_addr(id_priv),
2141 	       rdma_addr_size(cma_src_addr(id_priv)));
2142 
2143 	ret = iw_cm_listen(id_priv->cm_id.iw, backlog);
2144 
2145 	if (ret) {
2146 		iw_destroy_cm_id(id_priv->cm_id.iw);
2147 		id_priv->cm_id.iw = NULL;
2148 	}
2149 
2150 	return ret;
2151 }
2152 
2153 static int cma_listen_handler(struct rdma_cm_id *id,
2154 			      struct rdma_cm_event *event)
2155 {
2156 	struct rdma_id_private *id_priv = id->context;
2157 
2158 	id->context = id_priv->id.context;
2159 	id->event_handler = id_priv->id.event_handler;
2160 	return id_priv->id.event_handler(id, event);
2161 }
2162 
2163 static void cma_listen_on_dev(struct rdma_id_private *id_priv,
2164 			      struct cma_device *cma_dev)
2165 {
2166 	struct rdma_id_private *dev_id_priv;
2167 	struct rdma_cm_id *id;
2168 	struct net *net = id_priv->id.route.addr.dev_addr.net;
2169 	int ret;
2170 
2171 	if (cma_family(id_priv) == AF_IB && !rdma_cap_ib_cm(cma_dev->device, 1))
2172 		return;
2173 
2174 	id = rdma_create_id(net, cma_listen_handler, id_priv, id_priv->id.ps,
2175 			    id_priv->id.qp_type);
2176 	if (IS_ERR(id))
2177 		return;
2178 
2179 	dev_id_priv = container_of(id, struct rdma_id_private, id);
2180 
2181 	dev_id_priv->state = RDMA_CM_ADDR_BOUND;
2182 	memcpy(cma_src_addr(dev_id_priv), cma_src_addr(id_priv),
2183 	       rdma_addr_size(cma_src_addr(id_priv)));
2184 
2185 	_cma_attach_to_dev(dev_id_priv, cma_dev);
2186 	list_add_tail(&dev_id_priv->listen_list, &id_priv->listen_list);
2187 	atomic_inc(&id_priv->refcount);
2188 	dev_id_priv->internal_id = 1;
2189 	dev_id_priv->afonly = id_priv->afonly;
2190 
2191 	ret = rdma_listen(id, id_priv->backlog);
2192 	if (ret)
2193 		pr_warn("RDMA CMA: cma_listen_on_dev, error %d, listening on device %s\n",
2194 			ret, cma_dev->device->name);
2195 }
2196 
2197 static void cma_listen_on_all(struct rdma_id_private *id_priv)
2198 {
2199 	struct cma_device *cma_dev;
2200 
2201 	mutex_lock(&lock);
2202 	list_add_tail(&id_priv->list, &listen_any_list);
2203 	list_for_each_entry(cma_dev, &dev_list, list)
2204 		cma_listen_on_dev(id_priv, cma_dev);
2205 	mutex_unlock(&lock);
2206 }
2207 
2208 void rdma_set_service_type(struct rdma_cm_id *id, int tos)
2209 {
2210 	struct rdma_id_private *id_priv;
2211 
2212 	id_priv = container_of(id, struct rdma_id_private, id);
2213 	id_priv->tos = (u8) tos;
2214 }
2215 EXPORT_SYMBOL(rdma_set_service_type);
2216 
2217 static void cma_query_handler(int status, struct ib_sa_path_rec *path_rec,
2218 			      void *context)
2219 {
2220 	struct cma_work *work = context;
2221 	struct rdma_route *route;
2222 
2223 	route = &work->id->id.route;
2224 
2225 	if (!status) {
2226 		route->num_paths = 1;
2227 		*route->path_rec = *path_rec;
2228 	} else {
2229 		work->old_state = RDMA_CM_ROUTE_QUERY;
2230 		work->new_state = RDMA_CM_ADDR_RESOLVED;
2231 		work->event.event = RDMA_CM_EVENT_ROUTE_ERROR;
2232 		work->event.status = status;
2233 	}
2234 
2235 	queue_work(cma_wq, &work->work);
2236 }
2237 
2238 static int cma_query_ib_route(struct rdma_id_private *id_priv, int timeout_ms,
2239 			      struct cma_work *work)
2240 {
2241 	struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
2242 	struct ib_sa_path_rec path_rec;
2243 	ib_sa_comp_mask comp_mask;
2244 	struct sockaddr_in6 *sin6;
2245 	struct sockaddr_ib *sib;
2246 
2247 	memset(&path_rec, 0, sizeof path_rec);
2248 	rdma_addr_get_sgid(dev_addr, &path_rec.sgid);
2249 	rdma_addr_get_dgid(dev_addr, &path_rec.dgid);
2250 	path_rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
2251 	path_rec.numb_path = 1;
2252 	path_rec.reversible = 1;
2253 	path_rec.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
2254 
2255 	comp_mask = IB_SA_PATH_REC_DGID | IB_SA_PATH_REC_SGID |
2256 		    IB_SA_PATH_REC_PKEY | IB_SA_PATH_REC_NUMB_PATH |
2257 		    IB_SA_PATH_REC_REVERSIBLE | IB_SA_PATH_REC_SERVICE_ID;
2258 
2259 	switch (cma_family(id_priv)) {
2260 	case AF_INET:
2261 		path_rec.qos_class = cpu_to_be16((u16) id_priv->tos);
2262 		comp_mask |= IB_SA_PATH_REC_QOS_CLASS;
2263 		break;
2264 	case AF_INET6:
2265 		sin6 = (struct sockaddr_in6 *) cma_src_addr(id_priv);
2266 		path_rec.traffic_class = (u8) (be32_to_cpu(sin6->sin6_flowinfo) >> 20);
2267 		comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
2268 		break;
2269 	case AF_IB:
2270 		sib = (struct sockaddr_ib *) cma_src_addr(id_priv);
2271 		path_rec.traffic_class = (u8) (be32_to_cpu(sib->sib_flowinfo) >> 20);
2272 		comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
2273 		break;
2274 	}
2275 
2276 	id_priv->query_id = ib_sa_path_rec_get(&sa_client, id_priv->id.device,
2277 					       id_priv->id.port_num, &path_rec,
2278 					       comp_mask, timeout_ms,
2279 					       GFP_KERNEL, cma_query_handler,
2280 					       work, &id_priv->query);
2281 
2282 	return (id_priv->query_id < 0) ? id_priv->query_id : 0;
2283 }
2284 
2285 static void cma_work_handler(struct work_struct *_work)
2286 {
2287 	struct cma_work *work = container_of(_work, struct cma_work, work);
2288 	struct rdma_id_private *id_priv = work->id;
2289 	int destroy = 0;
2290 
2291 	mutex_lock(&id_priv->handler_mutex);
2292 	if (!cma_comp_exch(id_priv, work->old_state, work->new_state))
2293 		goto out;
2294 
2295 	if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
2296 		cma_exch(id_priv, RDMA_CM_DESTROYING);
2297 		destroy = 1;
2298 	}
2299 out:
2300 	mutex_unlock(&id_priv->handler_mutex);
2301 	cma_deref_id(id_priv);
2302 	if (destroy)
2303 		rdma_destroy_id(&id_priv->id);
2304 	kfree(work);
2305 }
2306 
2307 static void cma_ndev_work_handler(struct work_struct *_work)
2308 {
2309 	struct cma_ndev_work *work = container_of(_work, struct cma_ndev_work, work);
2310 	struct rdma_id_private *id_priv = work->id;
2311 	int destroy = 0;
2312 
2313 	mutex_lock(&id_priv->handler_mutex);
2314 	if (id_priv->state == RDMA_CM_DESTROYING ||
2315 	    id_priv->state == RDMA_CM_DEVICE_REMOVAL)
2316 		goto out;
2317 
2318 	if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
2319 		cma_exch(id_priv, RDMA_CM_DESTROYING);
2320 		destroy = 1;
2321 	}
2322 
2323 out:
2324 	mutex_unlock(&id_priv->handler_mutex);
2325 	cma_deref_id(id_priv);
2326 	if (destroy)
2327 		rdma_destroy_id(&id_priv->id);
2328 	kfree(work);
2329 }
2330 
2331 static int cma_resolve_ib_route(struct rdma_id_private *id_priv, int timeout_ms)
2332 {
2333 	struct rdma_route *route = &id_priv->id.route;
2334 	struct cma_work *work;
2335 	int ret;
2336 
2337 	work = kzalloc(sizeof *work, GFP_KERNEL);
2338 	if (!work)
2339 		return -ENOMEM;
2340 
2341 	work->id = id_priv;
2342 	INIT_WORK(&work->work, cma_work_handler);
2343 	work->old_state = RDMA_CM_ROUTE_QUERY;
2344 	work->new_state = RDMA_CM_ROUTE_RESOLVED;
2345 	work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
2346 
2347 	route->path_rec = kmalloc(sizeof *route->path_rec, GFP_KERNEL);
2348 	if (!route->path_rec) {
2349 		ret = -ENOMEM;
2350 		goto err1;
2351 	}
2352 
2353 	ret = cma_query_ib_route(id_priv, timeout_ms, work);
2354 	if (ret)
2355 		goto err2;
2356 
2357 	return 0;
2358 err2:
2359 	kfree(route->path_rec);
2360 	route->path_rec = NULL;
2361 err1:
2362 	kfree(work);
2363 	return ret;
2364 }
2365 
2366 int rdma_set_ib_paths(struct rdma_cm_id *id,
2367 		      struct ib_sa_path_rec *path_rec, int num_paths)
2368 {
2369 	struct rdma_id_private *id_priv;
2370 	int ret;
2371 
2372 	id_priv = container_of(id, struct rdma_id_private, id);
2373 	if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED,
2374 			   RDMA_CM_ROUTE_RESOLVED))
2375 		return -EINVAL;
2376 
2377 	id->route.path_rec = kmemdup(path_rec, sizeof *path_rec * num_paths,
2378 				     GFP_KERNEL);
2379 	if (!id->route.path_rec) {
2380 		ret = -ENOMEM;
2381 		goto err;
2382 	}
2383 
2384 	id->route.num_paths = num_paths;
2385 	return 0;
2386 err:
2387 	cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_ADDR_RESOLVED);
2388 	return ret;
2389 }
2390 EXPORT_SYMBOL(rdma_set_ib_paths);
2391 
2392 static int cma_resolve_iw_route(struct rdma_id_private *id_priv, int timeout_ms)
2393 {
2394 	struct cma_work *work;
2395 
2396 	work = kzalloc(sizeof *work, GFP_KERNEL);
2397 	if (!work)
2398 		return -ENOMEM;
2399 
2400 	work->id = id_priv;
2401 	INIT_WORK(&work->work, cma_work_handler);
2402 	work->old_state = RDMA_CM_ROUTE_QUERY;
2403 	work->new_state = RDMA_CM_ROUTE_RESOLVED;
2404 	work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
2405 	queue_work(cma_wq, &work->work);
2406 	return 0;
2407 }
2408 
2409 static int iboe_tos_to_sl(struct net_device *ndev, int tos)
2410 {
2411 	int prio;
2412 	struct net_device *dev;
2413 
2414 	prio = rt_tos2priority(tos);
2415 	dev = ndev->priv_flags & IFF_802_1Q_VLAN ?
2416 		vlan_dev_real_dev(ndev) : ndev;
2417 
2418 	if (dev->num_tc)
2419 		return netdev_get_prio_tc_map(dev, prio);
2420 
2421 #if IS_ENABLED(CONFIG_VLAN_8021Q)
2422 	if (ndev->priv_flags & IFF_802_1Q_VLAN)
2423 		return (vlan_dev_get_egress_qos_mask(ndev, prio) &
2424 			VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
2425 #endif
2426 	return 0;
2427 }
2428 
2429 static int cma_resolve_iboe_route(struct rdma_id_private *id_priv)
2430 {
2431 	struct rdma_route *route = &id_priv->id.route;
2432 	struct rdma_addr *addr = &route->addr;
2433 	struct cma_work *work;
2434 	int ret;
2435 	struct net_device *ndev = NULL;
2436 
2437 
2438 	work = kzalloc(sizeof *work, GFP_KERNEL);
2439 	if (!work)
2440 		return -ENOMEM;
2441 
2442 	work->id = id_priv;
2443 	INIT_WORK(&work->work, cma_work_handler);
2444 
2445 	route->path_rec = kzalloc(sizeof *route->path_rec, GFP_KERNEL);
2446 	if (!route->path_rec) {
2447 		ret = -ENOMEM;
2448 		goto err1;
2449 	}
2450 
2451 	route->num_paths = 1;
2452 
2453 	if (addr->dev_addr.bound_dev_if) {
2454 		ndev = dev_get_by_index(&init_net, addr->dev_addr.bound_dev_if);
2455 		if (!ndev)
2456 			return -ENODEV;
2457 
2458 		if (ndev->flags & IFF_LOOPBACK) {
2459 			dev_put(ndev);
2460 			if (!id_priv->id.device->get_netdev)
2461 				return -EOPNOTSUPP;
2462 
2463 			ndev = id_priv->id.device->get_netdev(id_priv->id.device,
2464 							      id_priv->id.port_num);
2465 			if (!ndev)
2466 				return -ENODEV;
2467 		}
2468 
2469 		route->path_rec->net = &init_net;
2470 		route->path_rec->ifindex = ndev->ifindex;
2471 		route->path_rec->gid_type = id_priv->gid_type;
2472 	}
2473 	if (!ndev) {
2474 		ret = -ENODEV;
2475 		goto err2;
2476 	}
2477 
2478 	memcpy(route->path_rec->dmac, addr->dev_addr.dst_dev_addr, ETH_ALEN);
2479 
2480 	rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
2481 		    &route->path_rec->sgid);
2482 	rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.dst_addr,
2483 		    &route->path_rec->dgid);
2484 
2485 	/* Use the hint from IP Stack to select GID Type */
2486 	if (route->path_rec->gid_type < ib_network_to_gid_type(addr->dev_addr.network))
2487 		route->path_rec->gid_type = ib_network_to_gid_type(addr->dev_addr.network);
2488 	if (((struct sockaddr *)&id_priv->id.route.addr.dst_addr)->sa_family != AF_IB)
2489 		/* TODO: get the hoplimit from the inet/inet6 device */
2490 		route->path_rec->hop_limit = addr->dev_addr.hoplimit;
2491 	else
2492 		route->path_rec->hop_limit = 1;
2493 	route->path_rec->reversible = 1;
2494 	route->path_rec->pkey = cpu_to_be16(0xffff);
2495 	route->path_rec->mtu_selector = IB_SA_EQ;
2496 	route->path_rec->sl = iboe_tos_to_sl(ndev, id_priv->tos);
2497 	route->path_rec->mtu = iboe_get_mtu(ndev->mtu);
2498 	route->path_rec->rate_selector = IB_SA_EQ;
2499 	route->path_rec->rate = iboe_get_rate(ndev);
2500 	dev_put(ndev);
2501 	route->path_rec->packet_life_time_selector = IB_SA_EQ;
2502 	route->path_rec->packet_life_time = CMA_IBOE_PACKET_LIFETIME;
2503 	if (!route->path_rec->mtu) {
2504 		ret = -EINVAL;
2505 		goto err2;
2506 	}
2507 
2508 	work->old_state = RDMA_CM_ROUTE_QUERY;
2509 	work->new_state = RDMA_CM_ROUTE_RESOLVED;
2510 	work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
2511 	work->event.status = 0;
2512 
2513 	queue_work(cma_wq, &work->work);
2514 
2515 	return 0;
2516 
2517 err2:
2518 	kfree(route->path_rec);
2519 	route->path_rec = NULL;
2520 err1:
2521 	kfree(work);
2522 	return ret;
2523 }
2524 
2525 int rdma_resolve_route(struct rdma_cm_id *id, int timeout_ms)
2526 {
2527 	struct rdma_id_private *id_priv;
2528 	int ret;
2529 
2530 	id_priv = container_of(id, struct rdma_id_private, id);
2531 	if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED, RDMA_CM_ROUTE_QUERY))
2532 		return -EINVAL;
2533 
2534 	atomic_inc(&id_priv->refcount);
2535 	if (rdma_cap_ib_sa(id->device, id->port_num))
2536 		ret = cma_resolve_ib_route(id_priv, timeout_ms);
2537 	else if (rdma_protocol_roce(id->device, id->port_num))
2538 		ret = cma_resolve_iboe_route(id_priv);
2539 	else if (rdma_protocol_iwarp(id->device, id->port_num))
2540 		ret = cma_resolve_iw_route(id_priv, timeout_ms);
2541 	else
2542 		ret = -ENOSYS;
2543 
2544 	if (ret)
2545 		goto err;
2546 
2547 	return 0;
2548 err:
2549 	cma_comp_exch(id_priv, RDMA_CM_ROUTE_QUERY, RDMA_CM_ADDR_RESOLVED);
2550 	cma_deref_id(id_priv);
2551 	return ret;
2552 }
2553 EXPORT_SYMBOL(rdma_resolve_route);
2554 
2555 static void cma_set_loopback(struct sockaddr *addr)
2556 {
2557 	switch (addr->sa_family) {
2558 	case AF_INET:
2559 		((struct sockaddr_in *) addr)->sin_addr.s_addr = htonl(INADDR_LOOPBACK);
2560 		break;
2561 	case AF_INET6:
2562 		ipv6_addr_set(&((struct sockaddr_in6 *) addr)->sin6_addr,
2563 			      0, 0, 0, htonl(1));
2564 		break;
2565 	default:
2566 		ib_addr_set(&((struct sockaddr_ib *) addr)->sib_addr,
2567 			    0, 0, 0, htonl(1));
2568 		break;
2569 	}
2570 }
2571 
2572 static int cma_bind_loopback(struct rdma_id_private *id_priv)
2573 {
2574 	struct cma_device *cma_dev, *cur_dev;
2575 	struct ib_port_attr port_attr;
2576 	union ib_gid gid;
2577 	u16 pkey;
2578 	int ret;
2579 	u8 p;
2580 
2581 	cma_dev = NULL;
2582 	mutex_lock(&lock);
2583 	list_for_each_entry(cur_dev, &dev_list, list) {
2584 		if (cma_family(id_priv) == AF_IB &&
2585 		    !rdma_cap_ib_cm(cur_dev->device, 1))
2586 			continue;
2587 
2588 		if (!cma_dev)
2589 			cma_dev = cur_dev;
2590 
2591 		for (p = 1; p <= cur_dev->device->phys_port_cnt; ++p) {
2592 			if (!ib_query_port(cur_dev->device, p, &port_attr) &&
2593 			    port_attr.state == IB_PORT_ACTIVE) {
2594 				cma_dev = cur_dev;
2595 				goto port_found;
2596 			}
2597 		}
2598 	}
2599 
2600 	if (!cma_dev) {
2601 		ret = -ENODEV;
2602 		goto out;
2603 	}
2604 
2605 	p = 1;
2606 
2607 port_found:
2608 	ret = ib_get_cached_gid(cma_dev->device, p, 0, &gid, NULL);
2609 	if (ret)
2610 		goto out;
2611 
2612 	ret = ib_get_cached_pkey(cma_dev->device, p, 0, &pkey);
2613 	if (ret)
2614 		goto out;
2615 
2616 	id_priv->id.route.addr.dev_addr.dev_type =
2617 		(rdma_protocol_ib(cma_dev->device, p)) ?
2618 		ARPHRD_INFINIBAND : ARPHRD_ETHER;
2619 
2620 	rdma_addr_set_sgid(&id_priv->id.route.addr.dev_addr, &gid);
2621 	ib_addr_set_pkey(&id_priv->id.route.addr.dev_addr, pkey);
2622 	id_priv->id.port_num = p;
2623 	cma_attach_to_dev(id_priv, cma_dev);
2624 	cma_set_loopback(cma_src_addr(id_priv));
2625 out:
2626 	mutex_unlock(&lock);
2627 	return ret;
2628 }
2629 
2630 static void addr_handler(int status, struct sockaddr *src_addr,
2631 			 struct rdma_dev_addr *dev_addr, void *context)
2632 {
2633 	struct rdma_id_private *id_priv = context;
2634 	struct rdma_cm_event event;
2635 
2636 	memset(&event, 0, sizeof event);
2637 	mutex_lock(&id_priv->handler_mutex);
2638 	if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY,
2639 			   RDMA_CM_ADDR_RESOLVED))
2640 		goto out;
2641 
2642 	memcpy(cma_src_addr(id_priv), src_addr, rdma_addr_size(src_addr));
2643 	if (!status && !id_priv->cma_dev)
2644 		status = cma_acquire_dev(id_priv, NULL);
2645 
2646 	if (status) {
2647 		if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_RESOLVED,
2648 				   RDMA_CM_ADDR_BOUND))
2649 			goto out;
2650 		event.event = RDMA_CM_EVENT_ADDR_ERROR;
2651 		event.status = status;
2652 	} else
2653 		event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
2654 
2655 	if (id_priv->id.event_handler(&id_priv->id, &event)) {
2656 		cma_exch(id_priv, RDMA_CM_DESTROYING);
2657 		mutex_unlock(&id_priv->handler_mutex);
2658 		cma_deref_id(id_priv);
2659 		rdma_destroy_id(&id_priv->id);
2660 		return;
2661 	}
2662 out:
2663 	mutex_unlock(&id_priv->handler_mutex);
2664 	cma_deref_id(id_priv);
2665 }
2666 
2667 static int cma_resolve_loopback(struct rdma_id_private *id_priv)
2668 {
2669 	struct cma_work *work;
2670 	union ib_gid gid;
2671 	int ret;
2672 
2673 	work = kzalloc(sizeof *work, GFP_KERNEL);
2674 	if (!work)
2675 		return -ENOMEM;
2676 
2677 	if (!id_priv->cma_dev) {
2678 		ret = cma_bind_loopback(id_priv);
2679 		if (ret)
2680 			goto err;
2681 	}
2682 
2683 	rdma_addr_get_sgid(&id_priv->id.route.addr.dev_addr, &gid);
2684 	rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, &gid);
2685 
2686 	work->id = id_priv;
2687 	INIT_WORK(&work->work, cma_work_handler);
2688 	work->old_state = RDMA_CM_ADDR_QUERY;
2689 	work->new_state = RDMA_CM_ADDR_RESOLVED;
2690 	work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
2691 	queue_work(cma_wq, &work->work);
2692 	return 0;
2693 err:
2694 	kfree(work);
2695 	return ret;
2696 }
2697 
2698 static int cma_resolve_ib_addr(struct rdma_id_private *id_priv)
2699 {
2700 	struct cma_work *work;
2701 	int ret;
2702 
2703 	work = kzalloc(sizeof *work, GFP_KERNEL);
2704 	if (!work)
2705 		return -ENOMEM;
2706 
2707 	if (!id_priv->cma_dev) {
2708 		ret = cma_resolve_ib_dev(id_priv);
2709 		if (ret)
2710 			goto err;
2711 	}
2712 
2713 	rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, (union ib_gid *)
2714 		&(((struct sockaddr_ib *) &id_priv->id.route.addr.dst_addr)->sib_addr));
2715 
2716 	work->id = id_priv;
2717 	INIT_WORK(&work->work, cma_work_handler);
2718 	work->old_state = RDMA_CM_ADDR_QUERY;
2719 	work->new_state = RDMA_CM_ADDR_RESOLVED;
2720 	work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
2721 	queue_work(cma_wq, &work->work);
2722 	return 0;
2723 err:
2724 	kfree(work);
2725 	return ret;
2726 }
2727 
2728 static int cma_bind_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
2729 			 struct sockaddr *dst_addr)
2730 {
2731 	if (!src_addr || !src_addr->sa_family) {
2732 		src_addr = (struct sockaddr *) &id->route.addr.src_addr;
2733 		src_addr->sa_family = dst_addr->sa_family;
2734 		if (dst_addr->sa_family == AF_INET6) {
2735 			struct sockaddr_in6 *src_addr6 = (struct sockaddr_in6 *) src_addr;
2736 			struct sockaddr_in6 *dst_addr6 = (struct sockaddr_in6 *) dst_addr;
2737 			src_addr6->sin6_scope_id = dst_addr6->sin6_scope_id;
2738 			if (ipv6_addr_type(&dst_addr6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
2739 				id->route.addr.dev_addr.bound_dev_if = dst_addr6->sin6_scope_id;
2740 		} else if (dst_addr->sa_family == AF_IB) {
2741 			((struct sockaddr_ib *) src_addr)->sib_pkey =
2742 				((struct sockaddr_ib *) dst_addr)->sib_pkey;
2743 		}
2744 	}
2745 	return rdma_bind_addr(id, src_addr);
2746 }
2747 
2748 int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
2749 		      struct sockaddr *dst_addr, int timeout_ms)
2750 {
2751 	struct rdma_id_private *id_priv;
2752 	int ret;
2753 
2754 	id_priv = container_of(id, struct rdma_id_private, id);
2755 	if (id_priv->state == RDMA_CM_IDLE) {
2756 		ret = cma_bind_addr(id, src_addr, dst_addr);
2757 		if (ret)
2758 			return ret;
2759 	}
2760 
2761 	if (cma_family(id_priv) != dst_addr->sa_family)
2762 		return -EINVAL;
2763 
2764 	if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_ADDR_QUERY))
2765 		return -EINVAL;
2766 
2767 	atomic_inc(&id_priv->refcount);
2768 	memcpy(cma_dst_addr(id_priv), dst_addr, rdma_addr_size(dst_addr));
2769 	if (cma_any_addr(dst_addr)) {
2770 		ret = cma_resolve_loopback(id_priv);
2771 	} else {
2772 		if (dst_addr->sa_family == AF_IB) {
2773 			ret = cma_resolve_ib_addr(id_priv);
2774 		} else {
2775 			ret = rdma_resolve_ip(&addr_client, cma_src_addr(id_priv),
2776 					      dst_addr, &id->route.addr.dev_addr,
2777 					      timeout_ms, addr_handler, id_priv);
2778 		}
2779 	}
2780 	if (ret)
2781 		goto err;
2782 
2783 	return 0;
2784 err:
2785 	cma_comp_exch(id_priv, RDMA_CM_ADDR_QUERY, RDMA_CM_ADDR_BOUND);
2786 	cma_deref_id(id_priv);
2787 	return ret;
2788 }
2789 EXPORT_SYMBOL(rdma_resolve_addr);
2790 
2791 int rdma_set_reuseaddr(struct rdma_cm_id *id, int reuse)
2792 {
2793 	struct rdma_id_private *id_priv;
2794 	unsigned long flags;
2795 	int ret;
2796 
2797 	id_priv = container_of(id, struct rdma_id_private, id);
2798 	spin_lock_irqsave(&id_priv->lock, flags);
2799 	if (reuse || id_priv->state == RDMA_CM_IDLE) {
2800 		id_priv->reuseaddr = reuse;
2801 		ret = 0;
2802 	} else {
2803 		ret = -EINVAL;
2804 	}
2805 	spin_unlock_irqrestore(&id_priv->lock, flags);
2806 	return ret;
2807 }
2808 EXPORT_SYMBOL(rdma_set_reuseaddr);
2809 
2810 int rdma_set_afonly(struct rdma_cm_id *id, int afonly)
2811 {
2812 	struct rdma_id_private *id_priv;
2813 	unsigned long flags;
2814 	int ret;
2815 
2816 	id_priv = container_of(id, struct rdma_id_private, id);
2817 	spin_lock_irqsave(&id_priv->lock, flags);
2818 	if (id_priv->state == RDMA_CM_IDLE || id_priv->state == RDMA_CM_ADDR_BOUND) {
2819 		id_priv->options |= (1 << CMA_OPTION_AFONLY);
2820 		id_priv->afonly = afonly;
2821 		ret = 0;
2822 	} else {
2823 		ret = -EINVAL;
2824 	}
2825 	spin_unlock_irqrestore(&id_priv->lock, flags);
2826 	return ret;
2827 }
2828 EXPORT_SYMBOL(rdma_set_afonly);
2829 
2830 static void cma_bind_port(struct rdma_bind_list *bind_list,
2831 			  struct rdma_id_private *id_priv)
2832 {
2833 	struct sockaddr *addr;
2834 	struct sockaddr_ib *sib;
2835 	u64 sid, mask;
2836 	__be16 port;
2837 
2838 	addr = cma_src_addr(id_priv);
2839 	port = htons(bind_list->port);
2840 
2841 	switch (addr->sa_family) {
2842 	case AF_INET:
2843 		((struct sockaddr_in *) addr)->sin_port = port;
2844 		break;
2845 	case AF_INET6:
2846 		((struct sockaddr_in6 *) addr)->sin6_port = port;
2847 		break;
2848 	case AF_IB:
2849 		sib = (struct sockaddr_ib *) addr;
2850 		sid = be64_to_cpu(sib->sib_sid);
2851 		mask = be64_to_cpu(sib->sib_sid_mask);
2852 		sib->sib_sid = cpu_to_be64((sid & mask) | (u64) ntohs(port));
2853 		sib->sib_sid_mask = cpu_to_be64(~0ULL);
2854 		break;
2855 	}
2856 	id_priv->bind_list = bind_list;
2857 	hlist_add_head(&id_priv->node, &bind_list->owners);
2858 }
2859 
2860 static int cma_alloc_port(enum rdma_port_space ps,
2861 			  struct rdma_id_private *id_priv, unsigned short snum)
2862 {
2863 	struct rdma_bind_list *bind_list;
2864 	int ret;
2865 
2866 	bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL);
2867 	if (!bind_list)
2868 		return -ENOMEM;
2869 
2870 	ret = cma_ps_alloc(id_priv->id.route.addr.dev_addr.net, ps, bind_list,
2871 			   snum);
2872 	if (ret < 0)
2873 		goto err;
2874 
2875 	bind_list->ps = ps;
2876 	bind_list->port = (unsigned short)ret;
2877 	cma_bind_port(bind_list, id_priv);
2878 	return 0;
2879 err:
2880 	kfree(bind_list);
2881 	return ret == -ENOSPC ? -EADDRNOTAVAIL : ret;
2882 }
2883 
2884 static int cma_alloc_any_port(enum rdma_port_space ps,
2885 			      struct rdma_id_private *id_priv)
2886 {
2887 	static unsigned int last_used_port;
2888 	int low, high, remaining;
2889 	unsigned int rover;
2890 	struct net *net = id_priv->id.route.addr.dev_addr.net;
2891 
2892 	inet_get_local_port_range(net, &low, &high);
2893 	remaining = (high - low) + 1;
2894 	rover = prandom_u32() % remaining + low;
2895 retry:
2896 	if (last_used_port != rover &&
2897 	    !cma_ps_find(net, ps, (unsigned short)rover)) {
2898 		int ret = cma_alloc_port(ps, id_priv, rover);
2899 		/*
2900 		 * Remember previously used port number in order to avoid
2901 		 * re-using same port immediately after it is closed.
2902 		 */
2903 		if (!ret)
2904 			last_used_port = rover;
2905 		if (ret != -EADDRNOTAVAIL)
2906 			return ret;
2907 	}
2908 	if (--remaining) {
2909 		rover++;
2910 		if ((rover < low) || (rover > high))
2911 			rover = low;
2912 		goto retry;
2913 	}
2914 	return -EADDRNOTAVAIL;
2915 }
2916 
2917 /*
2918  * Check that the requested port is available.  This is called when trying to
2919  * bind to a specific port, or when trying to listen on a bound port.  In
2920  * the latter case, the provided id_priv may already be on the bind_list, but
2921  * we still need to check that it's okay to start listening.
2922  */
2923 static int cma_check_port(struct rdma_bind_list *bind_list,
2924 			  struct rdma_id_private *id_priv, uint8_t reuseaddr)
2925 {
2926 	struct rdma_id_private *cur_id;
2927 	struct sockaddr *addr, *cur_addr;
2928 
2929 	addr = cma_src_addr(id_priv);
2930 	hlist_for_each_entry(cur_id, &bind_list->owners, node) {
2931 		if (id_priv == cur_id)
2932 			continue;
2933 
2934 		if ((cur_id->state != RDMA_CM_LISTEN) && reuseaddr &&
2935 		    cur_id->reuseaddr)
2936 			continue;
2937 
2938 		cur_addr = cma_src_addr(cur_id);
2939 		if (id_priv->afonly && cur_id->afonly &&
2940 		    (addr->sa_family != cur_addr->sa_family))
2941 			continue;
2942 
2943 		if (cma_any_addr(addr) || cma_any_addr(cur_addr))
2944 			return -EADDRNOTAVAIL;
2945 
2946 		if (!cma_addr_cmp(addr, cur_addr))
2947 			return -EADDRINUSE;
2948 	}
2949 	return 0;
2950 }
2951 
2952 static int cma_use_port(enum rdma_port_space ps,
2953 			struct rdma_id_private *id_priv)
2954 {
2955 	struct rdma_bind_list *bind_list;
2956 	unsigned short snum;
2957 	int ret;
2958 
2959 	snum = ntohs(cma_port(cma_src_addr(id_priv)));
2960 	if (snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
2961 		return -EACCES;
2962 
2963 	bind_list = cma_ps_find(id_priv->id.route.addr.dev_addr.net, ps, snum);
2964 	if (!bind_list) {
2965 		ret = cma_alloc_port(ps, id_priv, snum);
2966 	} else {
2967 		ret = cma_check_port(bind_list, id_priv, id_priv->reuseaddr);
2968 		if (!ret)
2969 			cma_bind_port(bind_list, id_priv);
2970 	}
2971 	return ret;
2972 }
2973 
2974 static int cma_bind_listen(struct rdma_id_private *id_priv)
2975 {
2976 	struct rdma_bind_list *bind_list = id_priv->bind_list;
2977 	int ret = 0;
2978 
2979 	mutex_lock(&lock);
2980 	if (bind_list->owners.first->next)
2981 		ret = cma_check_port(bind_list, id_priv, 0);
2982 	mutex_unlock(&lock);
2983 	return ret;
2984 }
2985 
2986 static enum rdma_port_space cma_select_inet_ps(
2987 		struct rdma_id_private *id_priv)
2988 {
2989 	switch (id_priv->id.ps) {
2990 	case RDMA_PS_TCP:
2991 	case RDMA_PS_UDP:
2992 	case RDMA_PS_IPOIB:
2993 	case RDMA_PS_IB:
2994 		return id_priv->id.ps;
2995 	default:
2996 
2997 		return 0;
2998 	}
2999 }
3000 
3001 static enum rdma_port_space cma_select_ib_ps(struct rdma_id_private *id_priv)
3002 {
3003 	enum rdma_port_space ps = 0;
3004 	struct sockaddr_ib *sib;
3005 	u64 sid_ps, mask, sid;
3006 
3007 	sib = (struct sockaddr_ib *) cma_src_addr(id_priv);
3008 	mask = be64_to_cpu(sib->sib_sid_mask) & RDMA_IB_IP_PS_MASK;
3009 	sid = be64_to_cpu(sib->sib_sid) & mask;
3010 
3011 	if ((id_priv->id.ps == RDMA_PS_IB) && (sid == (RDMA_IB_IP_PS_IB & mask))) {
3012 		sid_ps = RDMA_IB_IP_PS_IB;
3013 		ps = RDMA_PS_IB;
3014 	} else if (((id_priv->id.ps == RDMA_PS_IB) || (id_priv->id.ps == RDMA_PS_TCP)) &&
3015 		   (sid == (RDMA_IB_IP_PS_TCP & mask))) {
3016 		sid_ps = RDMA_IB_IP_PS_TCP;
3017 		ps = RDMA_PS_TCP;
3018 	} else if (((id_priv->id.ps == RDMA_PS_IB) || (id_priv->id.ps == RDMA_PS_UDP)) &&
3019 		   (sid == (RDMA_IB_IP_PS_UDP & mask))) {
3020 		sid_ps = RDMA_IB_IP_PS_UDP;
3021 		ps = RDMA_PS_UDP;
3022 	}
3023 
3024 	if (ps) {
3025 		sib->sib_sid = cpu_to_be64(sid_ps | ntohs(cma_port((struct sockaddr *) sib)));
3026 		sib->sib_sid_mask = cpu_to_be64(RDMA_IB_IP_PS_MASK |
3027 						be64_to_cpu(sib->sib_sid_mask));
3028 	}
3029 	return ps;
3030 }
3031 
3032 static int cma_get_port(struct rdma_id_private *id_priv)
3033 {
3034 	enum rdma_port_space ps;
3035 	int ret;
3036 
3037 	if (cma_family(id_priv) != AF_IB)
3038 		ps = cma_select_inet_ps(id_priv);
3039 	else
3040 		ps = cma_select_ib_ps(id_priv);
3041 	if (!ps)
3042 		return -EPROTONOSUPPORT;
3043 
3044 	mutex_lock(&lock);
3045 	if (cma_any_port(cma_src_addr(id_priv)))
3046 		ret = cma_alloc_any_port(ps, id_priv);
3047 	else
3048 		ret = cma_use_port(ps, id_priv);
3049 	mutex_unlock(&lock);
3050 
3051 	return ret;
3052 }
3053 
3054 static int cma_check_linklocal(struct rdma_dev_addr *dev_addr,
3055 			       struct sockaddr *addr)
3056 {
3057 #if IS_ENABLED(CONFIG_IPV6)
3058 	struct sockaddr_in6 *sin6;
3059 
3060 	if (addr->sa_family != AF_INET6)
3061 		return 0;
3062 
3063 	sin6 = (struct sockaddr_in6 *) addr;
3064 
3065 	if (!(ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL))
3066 		return 0;
3067 
3068 	if (!sin6->sin6_scope_id)
3069 			return -EINVAL;
3070 
3071 	dev_addr->bound_dev_if = sin6->sin6_scope_id;
3072 #endif
3073 	return 0;
3074 }
3075 
3076 int rdma_listen(struct rdma_cm_id *id, int backlog)
3077 {
3078 	struct rdma_id_private *id_priv;
3079 	int ret;
3080 
3081 	id_priv = container_of(id, struct rdma_id_private, id);
3082 	if (id_priv->state == RDMA_CM_IDLE) {
3083 		id->route.addr.src_addr.ss_family = AF_INET;
3084 		ret = rdma_bind_addr(id, cma_src_addr(id_priv));
3085 		if (ret)
3086 			return ret;
3087 	}
3088 
3089 	if (!cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_LISTEN))
3090 		return -EINVAL;
3091 
3092 	if (id_priv->reuseaddr) {
3093 		ret = cma_bind_listen(id_priv);
3094 		if (ret)
3095 			goto err;
3096 	}
3097 
3098 	id_priv->backlog = backlog;
3099 	if (id->device) {
3100 		if (rdma_cap_ib_cm(id->device, 1)) {
3101 			ret = cma_ib_listen(id_priv);
3102 			if (ret)
3103 				goto err;
3104 		} else if (rdma_cap_iw_cm(id->device, 1)) {
3105 			ret = cma_iw_listen(id_priv, backlog);
3106 			if (ret)
3107 				goto err;
3108 		} else {
3109 			ret = -ENOSYS;
3110 			goto err;
3111 		}
3112 	} else
3113 		cma_listen_on_all(id_priv);
3114 
3115 	return 0;
3116 err:
3117 	id_priv->backlog = 0;
3118 	cma_comp_exch(id_priv, RDMA_CM_LISTEN, RDMA_CM_ADDR_BOUND);
3119 	return ret;
3120 }
3121 EXPORT_SYMBOL(rdma_listen);
3122 
3123 int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr)
3124 {
3125 	struct rdma_id_private *id_priv;
3126 	int ret;
3127 
3128 	if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6 &&
3129 	    addr->sa_family != AF_IB)
3130 		return -EAFNOSUPPORT;
3131 
3132 	id_priv = container_of(id, struct rdma_id_private, id);
3133 	if (!cma_comp_exch(id_priv, RDMA_CM_IDLE, RDMA_CM_ADDR_BOUND))
3134 		return -EINVAL;
3135 
3136 	ret = cma_check_linklocal(&id->route.addr.dev_addr, addr);
3137 	if (ret)
3138 		goto err1;
3139 
3140 	memcpy(cma_src_addr(id_priv), addr, rdma_addr_size(addr));
3141 	if (!cma_any_addr(addr)) {
3142 		ret = cma_translate_addr(addr, &id->route.addr.dev_addr);
3143 		if (ret)
3144 			goto err1;
3145 
3146 		ret = cma_acquire_dev(id_priv, NULL);
3147 		if (ret)
3148 			goto err1;
3149 	}
3150 
3151 	if (!(id_priv->options & (1 << CMA_OPTION_AFONLY))) {
3152 		if (addr->sa_family == AF_INET)
3153 			id_priv->afonly = 1;
3154 #if IS_ENABLED(CONFIG_IPV6)
3155 		else if (addr->sa_family == AF_INET6) {
3156 			struct net *net = id_priv->id.route.addr.dev_addr.net;
3157 
3158 			id_priv->afonly = net->ipv6.sysctl.bindv6only;
3159 		}
3160 #endif
3161 	}
3162 	ret = cma_get_port(id_priv);
3163 	if (ret)
3164 		goto err2;
3165 
3166 	return 0;
3167 err2:
3168 	if (id_priv->cma_dev)
3169 		cma_release_dev(id_priv);
3170 err1:
3171 	cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_IDLE);
3172 	return ret;
3173 }
3174 EXPORT_SYMBOL(rdma_bind_addr);
3175 
3176 static int cma_format_hdr(void *hdr, struct rdma_id_private *id_priv)
3177 {
3178 	struct cma_hdr *cma_hdr;
3179 
3180 	cma_hdr = hdr;
3181 	cma_hdr->cma_version = CMA_VERSION;
3182 	if (cma_family(id_priv) == AF_INET) {
3183 		struct sockaddr_in *src4, *dst4;
3184 
3185 		src4 = (struct sockaddr_in *) cma_src_addr(id_priv);
3186 		dst4 = (struct sockaddr_in *) cma_dst_addr(id_priv);
3187 
3188 		cma_set_ip_ver(cma_hdr, 4);
3189 		cma_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
3190 		cma_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
3191 		cma_hdr->port = src4->sin_port;
3192 	} else if (cma_family(id_priv) == AF_INET6) {
3193 		struct sockaddr_in6 *src6, *dst6;
3194 
3195 		src6 = (struct sockaddr_in6 *) cma_src_addr(id_priv);
3196 		dst6 = (struct sockaddr_in6 *) cma_dst_addr(id_priv);
3197 
3198 		cma_set_ip_ver(cma_hdr, 6);
3199 		cma_hdr->src_addr.ip6 = src6->sin6_addr;
3200 		cma_hdr->dst_addr.ip6 = dst6->sin6_addr;
3201 		cma_hdr->port = src6->sin6_port;
3202 	}
3203 	return 0;
3204 }
3205 
3206 static int cma_sidr_rep_handler(struct ib_cm_id *cm_id,
3207 				struct ib_cm_event *ib_event)
3208 {
3209 	struct rdma_id_private *id_priv = cm_id->context;
3210 	struct rdma_cm_event event;
3211 	struct ib_cm_sidr_rep_event_param *rep = &ib_event->param.sidr_rep_rcvd;
3212 	int ret = 0;
3213 
3214 	mutex_lock(&id_priv->handler_mutex);
3215 	if (id_priv->state != RDMA_CM_CONNECT)
3216 		goto out;
3217 
3218 	memset(&event, 0, sizeof event);
3219 	switch (ib_event->event) {
3220 	case IB_CM_SIDR_REQ_ERROR:
3221 		event.event = RDMA_CM_EVENT_UNREACHABLE;
3222 		event.status = -ETIMEDOUT;
3223 		break;
3224 	case IB_CM_SIDR_REP_RECEIVED:
3225 		event.param.ud.private_data = ib_event->private_data;
3226 		event.param.ud.private_data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
3227 		if (rep->status != IB_SIDR_SUCCESS) {
3228 			event.event = RDMA_CM_EVENT_UNREACHABLE;
3229 			event.status = ib_event->param.sidr_rep_rcvd.status;
3230 			break;
3231 		}
3232 		ret = cma_set_qkey(id_priv, rep->qkey);
3233 		if (ret) {
3234 			event.event = RDMA_CM_EVENT_ADDR_ERROR;
3235 			event.status = ret;
3236 			break;
3237 		}
3238 		ib_init_ah_from_path(id_priv->id.device, id_priv->id.port_num,
3239 				     id_priv->id.route.path_rec,
3240 				     &event.param.ud.ah_attr);
3241 		event.param.ud.qp_num = rep->qpn;
3242 		event.param.ud.qkey = rep->qkey;
3243 		event.event = RDMA_CM_EVENT_ESTABLISHED;
3244 		event.status = 0;
3245 		break;
3246 	default:
3247 		pr_err("RDMA CMA: unexpected IB CM event: %d\n",
3248 		       ib_event->event);
3249 		goto out;
3250 	}
3251 
3252 	ret = id_priv->id.event_handler(&id_priv->id, &event);
3253 	if (ret) {
3254 		/* Destroy the CM ID by returning a non-zero value. */
3255 		id_priv->cm_id.ib = NULL;
3256 		cma_exch(id_priv, RDMA_CM_DESTROYING);
3257 		mutex_unlock(&id_priv->handler_mutex);
3258 		rdma_destroy_id(&id_priv->id);
3259 		return ret;
3260 	}
3261 out:
3262 	mutex_unlock(&id_priv->handler_mutex);
3263 	return ret;
3264 }
3265 
3266 static int cma_resolve_ib_udp(struct rdma_id_private *id_priv,
3267 			      struct rdma_conn_param *conn_param)
3268 {
3269 	struct ib_cm_sidr_req_param req;
3270 	struct ib_cm_id	*id;
3271 	void *private_data;
3272 	int offset, ret;
3273 
3274 	memset(&req, 0, sizeof req);
3275 	offset = cma_user_data_offset(id_priv);
3276 	req.private_data_len = offset + conn_param->private_data_len;
3277 	if (req.private_data_len < conn_param->private_data_len)
3278 		return -EINVAL;
3279 
3280 	if (req.private_data_len) {
3281 		private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
3282 		if (!private_data)
3283 			return -ENOMEM;
3284 	} else {
3285 		private_data = NULL;
3286 	}
3287 
3288 	if (conn_param->private_data && conn_param->private_data_len)
3289 		memcpy(private_data + offset, conn_param->private_data,
3290 		       conn_param->private_data_len);
3291 
3292 	if (private_data) {
3293 		ret = cma_format_hdr(private_data, id_priv);
3294 		if (ret)
3295 			goto out;
3296 		req.private_data = private_data;
3297 	}
3298 
3299 	id = ib_create_cm_id(id_priv->id.device, cma_sidr_rep_handler,
3300 			     id_priv);
3301 	if (IS_ERR(id)) {
3302 		ret = PTR_ERR(id);
3303 		goto out;
3304 	}
3305 	id_priv->cm_id.ib = id;
3306 
3307 	req.path = id_priv->id.route.path_rec;
3308 	req.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
3309 	req.timeout_ms = 1 << (CMA_CM_RESPONSE_TIMEOUT - 8);
3310 	req.max_cm_retries = CMA_MAX_CM_RETRIES;
3311 
3312 	ret = ib_send_cm_sidr_req(id_priv->cm_id.ib, &req);
3313 	if (ret) {
3314 		ib_destroy_cm_id(id_priv->cm_id.ib);
3315 		id_priv->cm_id.ib = NULL;
3316 	}
3317 out:
3318 	kfree(private_data);
3319 	return ret;
3320 }
3321 
3322 static int cma_connect_ib(struct rdma_id_private *id_priv,
3323 			  struct rdma_conn_param *conn_param)
3324 {
3325 	struct ib_cm_req_param req;
3326 	struct rdma_route *route;
3327 	void *private_data;
3328 	struct ib_cm_id	*id;
3329 	int offset, ret;
3330 
3331 	memset(&req, 0, sizeof req);
3332 	offset = cma_user_data_offset(id_priv);
3333 	req.private_data_len = offset + conn_param->private_data_len;
3334 	if (req.private_data_len < conn_param->private_data_len)
3335 		return -EINVAL;
3336 
3337 	if (req.private_data_len) {
3338 		private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
3339 		if (!private_data)
3340 			return -ENOMEM;
3341 	} else {
3342 		private_data = NULL;
3343 	}
3344 
3345 	if (conn_param->private_data && conn_param->private_data_len)
3346 		memcpy(private_data + offset, conn_param->private_data,
3347 		       conn_param->private_data_len);
3348 
3349 	id = ib_create_cm_id(id_priv->id.device, cma_ib_handler, id_priv);
3350 	if (IS_ERR(id)) {
3351 		ret = PTR_ERR(id);
3352 		goto out;
3353 	}
3354 	id_priv->cm_id.ib = id;
3355 
3356 	route = &id_priv->id.route;
3357 	if (private_data) {
3358 		ret = cma_format_hdr(private_data, id_priv);
3359 		if (ret)
3360 			goto out;
3361 		req.private_data = private_data;
3362 	}
3363 
3364 	req.primary_path = &route->path_rec[0];
3365 	if (route->num_paths == 2)
3366 		req.alternate_path = &route->path_rec[1];
3367 
3368 	req.service_id = rdma_get_service_id(&id_priv->id, cma_dst_addr(id_priv));
3369 	req.qp_num = id_priv->qp_num;
3370 	req.qp_type = id_priv->id.qp_type;
3371 	req.starting_psn = id_priv->seq_num;
3372 	req.responder_resources = conn_param->responder_resources;
3373 	req.initiator_depth = conn_param->initiator_depth;
3374 	req.flow_control = conn_param->flow_control;
3375 	req.retry_count = min_t(u8, 7, conn_param->retry_count);
3376 	req.rnr_retry_count = min_t(u8, 7, conn_param->rnr_retry_count);
3377 	req.remote_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
3378 	req.local_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
3379 	req.max_cm_retries = CMA_MAX_CM_RETRIES;
3380 	req.srq = id_priv->srq ? 1 : 0;
3381 
3382 	ret = ib_send_cm_req(id_priv->cm_id.ib, &req);
3383 out:
3384 	if (ret && !IS_ERR(id)) {
3385 		ib_destroy_cm_id(id);
3386 		id_priv->cm_id.ib = NULL;
3387 	}
3388 
3389 	kfree(private_data);
3390 	return ret;
3391 }
3392 
3393 static int cma_connect_iw(struct rdma_id_private *id_priv,
3394 			  struct rdma_conn_param *conn_param)
3395 {
3396 	struct iw_cm_id *cm_id;
3397 	int ret;
3398 	struct iw_cm_conn_param iw_param;
3399 
3400 	cm_id = iw_create_cm_id(id_priv->id.device, cma_iw_handler, id_priv);
3401 	if (IS_ERR(cm_id))
3402 		return PTR_ERR(cm_id);
3403 
3404 	cm_id->tos = id_priv->tos;
3405 	id_priv->cm_id.iw = cm_id;
3406 
3407 	memcpy(&cm_id->local_addr, cma_src_addr(id_priv),
3408 	       rdma_addr_size(cma_src_addr(id_priv)));
3409 	memcpy(&cm_id->remote_addr, cma_dst_addr(id_priv),
3410 	       rdma_addr_size(cma_dst_addr(id_priv)));
3411 
3412 	ret = cma_modify_qp_rtr(id_priv, conn_param);
3413 	if (ret)
3414 		goto out;
3415 
3416 	if (conn_param) {
3417 		iw_param.ord = conn_param->initiator_depth;
3418 		iw_param.ird = conn_param->responder_resources;
3419 		iw_param.private_data = conn_param->private_data;
3420 		iw_param.private_data_len = conn_param->private_data_len;
3421 		iw_param.qpn = id_priv->id.qp ? id_priv->qp_num : conn_param->qp_num;
3422 	} else {
3423 		memset(&iw_param, 0, sizeof iw_param);
3424 		iw_param.qpn = id_priv->qp_num;
3425 	}
3426 	ret = iw_cm_connect(cm_id, &iw_param);
3427 out:
3428 	if (ret) {
3429 		iw_destroy_cm_id(cm_id);
3430 		id_priv->cm_id.iw = NULL;
3431 	}
3432 	return ret;
3433 }
3434 
3435 int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
3436 {
3437 	struct rdma_id_private *id_priv;
3438 	int ret;
3439 
3440 	id_priv = container_of(id, struct rdma_id_private, id);
3441 	if (!cma_comp_exch(id_priv, RDMA_CM_ROUTE_RESOLVED, RDMA_CM_CONNECT))
3442 		return -EINVAL;
3443 
3444 	if (!id->qp) {
3445 		id_priv->qp_num = conn_param->qp_num;
3446 		id_priv->srq = conn_param->srq;
3447 	}
3448 
3449 	if (rdma_cap_ib_cm(id->device, id->port_num)) {
3450 		if (id->qp_type == IB_QPT_UD)
3451 			ret = cma_resolve_ib_udp(id_priv, conn_param);
3452 		else
3453 			ret = cma_connect_ib(id_priv, conn_param);
3454 	} else if (rdma_cap_iw_cm(id->device, id->port_num))
3455 		ret = cma_connect_iw(id_priv, conn_param);
3456 	else
3457 		ret = -ENOSYS;
3458 	if (ret)
3459 		goto err;
3460 
3461 	return 0;
3462 err:
3463 	cma_comp_exch(id_priv, RDMA_CM_CONNECT, RDMA_CM_ROUTE_RESOLVED);
3464 	return ret;
3465 }
3466 EXPORT_SYMBOL(rdma_connect);
3467 
3468 static int cma_accept_ib(struct rdma_id_private *id_priv,
3469 			 struct rdma_conn_param *conn_param)
3470 {
3471 	struct ib_cm_rep_param rep;
3472 	int ret;
3473 
3474 	ret = cma_modify_qp_rtr(id_priv, conn_param);
3475 	if (ret)
3476 		goto out;
3477 
3478 	ret = cma_modify_qp_rts(id_priv, conn_param);
3479 	if (ret)
3480 		goto out;
3481 
3482 	memset(&rep, 0, sizeof rep);
3483 	rep.qp_num = id_priv->qp_num;
3484 	rep.starting_psn = id_priv->seq_num;
3485 	rep.private_data = conn_param->private_data;
3486 	rep.private_data_len = conn_param->private_data_len;
3487 	rep.responder_resources = conn_param->responder_resources;
3488 	rep.initiator_depth = conn_param->initiator_depth;
3489 	rep.failover_accepted = 0;
3490 	rep.flow_control = conn_param->flow_control;
3491 	rep.rnr_retry_count = min_t(u8, 7, conn_param->rnr_retry_count);
3492 	rep.srq = id_priv->srq ? 1 : 0;
3493 
3494 	ret = ib_send_cm_rep(id_priv->cm_id.ib, &rep);
3495 out:
3496 	return ret;
3497 }
3498 
3499 static int cma_accept_iw(struct rdma_id_private *id_priv,
3500 		  struct rdma_conn_param *conn_param)
3501 {
3502 	struct iw_cm_conn_param iw_param;
3503 	int ret;
3504 
3505 	ret = cma_modify_qp_rtr(id_priv, conn_param);
3506 	if (ret)
3507 		return ret;
3508 
3509 	iw_param.ord = conn_param->initiator_depth;
3510 	iw_param.ird = conn_param->responder_resources;
3511 	iw_param.private_data = conn_param->private_data;
3512 	iw_param.private_data_len = conn_param->private_data_len;
3513 	if (id_priv->id.qp) {
3514 		iw_param.qpn = id_priv->qp_num;
3515 	} else
3516 		iw_param.qpn = conn_param->qp_num;
3517 
3518 	return iw_cm_accept(id_priv->cm_id.iw, &iw_param);
3519 }
3520 
3521 static int cma_send_sidr_rep(struct rdma_id_private *id_priv,
3522 			     enum ib_cm_sidr_status status, u32 qkey,
3523 			     const void *private_data, int private_data_len)
3524 {
3525 	struct ib_cm_sidr_rep_param rep;
3526 	int ret;
3527 
3528 	memset(&rep, 0, sizeof rep);
3529 	rep.status = status;
3530 	if (status == IB_SIDR_SUCCESS) {
3531 		ret = cma_set_qkey(id_priv, qkey);
3532 		if (ret)
3533 			return ret;
3534 		rep.qp_num = id_priv->qp_num;
3535 		rep.qkey = id_priv->qkey;
3536 	}
3537 	rep.private_data = private_data;
3538 	rep.private_data_len = private_data_len;
3539 
3540 	return ib_send_cm_sidr_rep(id_priv->cm_id.ib, &rep);
3541 }
3542 
3543 int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
3544 {
3545 	struct rdma_id_private *id_priv;
3546 	int ret;
3547 
3548 	id_priv = container_of(id, struct rdma_id_private, id);
3549 
3550 	id_priv->owner = task_pid_nr(current);
3551 
3552 	if (!cma_comp(id_priv, RDMA_CM_CONNECT))
3553 		return -EINVAL;
3554 
3555 	if (!id->qp && conn_param) {
3556 		id_priv->qp_num = conn_param->qp_num;
3557 		id_priv->srq = conn_param->srq;
3558 	}
3559 
3560 	if (rdma_cap_ib_cm(id->device, id->port_num)) {
3561 		if (id->qp_type == IB_QPT_UD) {
3562 			if (conn_param)
3563 				ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
3564 							conn_param->qkey,
3565 							conn_param->private_data,
3566 							conn_param->private_data_len);
3567 			else
3568 				ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
3569 							0, NULL, 0);
3570 		} else {
3571 			if (conn_param)
3572 				ret = cma_accept_ib(id_priv, conn_param);
3573 			else
3574 				ret = cma_rep_recv(id_priv);
3575 		}
3576 	} else if (rdma_cap_iw_cm(id->device, id->port_num))
3577 		ret = cma_accept_iw(id_priv, conn_param);
3578 	else
3579 		ret = -ENOSYS;
3580 
3581 	if (ret)
3582 		goto reject;
3583 
3584 	return 0;
3585 reject:
3586 	cma_modify_qp_err(id_priv);
3587 	rdma_reject(id, NULL, 0);
3588 	return ret;
3589 }
3590 EXPORT_SYMBOL(rdma_accept);
3591 
3592 int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event)
3593 {
3594 	struct rdma_id_private *id_priv;
3595 	int ret;
3596 
3597 	id_priv = container_of(id, struct rdma_id_private, id);
3598 	if (!id_priv->cm_id.ib)
3599 		return -EINVAL;
3600 
3601 	switch (id->device->node_type) {
3602 	case RDMA_NODE_IB_CA:
3603 		ret = ib_cm_notify(id_priv->cm_id.ib, event);
3604 		break;
3605 	default:
3606 		ret = 0;
3607 		break;
3608 	}
3609 	return ret;
3610 }
3611 EXPORT_SYMBOL(rdma_notify);
3612 
3613 int rdma_reject(struct rdma_cm_id *id, const void *private_data,
3614 		u8 private_data_len)
3615 {
3616 	struct rdma_id_private *id_priv;
3617 	int ret;
3618 
3619 	id_priv = container_of(id, struct rdma_id_private, id);
3620 	if (!id_priv->cm_id.ib)
3621 		return -EINVAL;
3622 
3623 	if (rdma_cap_ib_cm(id->device, id->port_num)) {
3624 		if (id->qp_type == IB_QPT_UD)
3625 			ret = cma_send_sidr_rep(id_priv, IB_SIDR_REJECT, 0,
3626 						private_data, private_data_len);
3627 		else
3628 			ret = ib_send_cm_rej(id_priv->cm_id.ib,
3629 					     IB_CM_REJ_CONSUMER_DEFINED, NULL,
3630 					     0, private_data, private_data_len);
3631 	} else if (rdma_cap_iw_cm(id->device, id->port_num)) {
3632 		ret = iw_cm_reject(id_priv->cm_id.iw,
3633 				   private_data, private_data_len);
3634 	} else
3635 		ret = -ENOSYS;
3636 
3637 	return ret;
3638 }
3639 EXPORT_SYMBOL(rdma_reject);
3640 
3641 int rdma_disconnect(struct rdma_cm_id *id)
3642 {
3643 	struct rdma_id_private *id_priv;
3644 	int ret;
3645 
3646 	id_priv = container_of(id, struct rdma_id_private, id);
3647 	if (!id_priv->cm_id.ib)
3648 		return -EINVAL;
3649 
3650 	if (rdma_cap_ib_cm(id->device, id->port_num)) {
3651 		ret = cma_modify_qp_err(id_priv);
3652 		if (ret)
3653 			goto out;
3654 		/* Initiate or respond to a disconnect. */
3655 		if (ib_send_cm_dreq(id_priv->cm_id.ib, NULL, 0))
3656 			ib_send_cm_drep(id_priv->cm_id.ib, NULL, 0);
3657 	} else if (rdma_cap_iw_cm(id->device, id->port_num)) {
3658 		ret = iw_cm_disconnect(id_priv->cm_id.iw, 0);
3659 	} else
3660 		ret = -EINVAL;
3661 
3662 out:
3663 	return ret;
3664 }
3665 EXPORT_SYMBOL(rdma_disconnect);
3666 
3667 static int cma_ib_mc_handler(int status, struct ib_sa_multicast *multicast)
3668 {
3669 	struct rdma_id_private *id_priv;
3670 	struct cma_multicast *mc = multicast->context;
3671 	struct rdma_cm_event event;
3672 	int ret = 0;
3673 
3674 	id_priv = mc->id_priv;
3675 	mutex_lock(&id_priv->handler_mutex);
3676 	if (id_priv->state != RDMA_CM_ADDR_BOUND &&
3677 	    id_priv->state != RDMA_CM_ADDR_RESOLVED)
3678 		goto out;
3679 
3680 	if (!status)
3681 		status = cma_set_qkey(id_priv, be32_to_cpu(multicast->rec.qkey));
3682 	mutex_lock(&id_priv->qp_mutex);
3683 	if (!status && id_priv->id.qp)
3684 		status = ib_attach_mcast(id_priv->id.qp, &multicast->rec.mgid,
3685 					 be16_to_cpu(multicast->rec.mlid));
3686 	mutex_unlock(&id_priv->qp_mutex);
3687 
3688 	memset(&event, 0, sizeof event);
3689 	event.status = status;
3690 	event.param.ud.private_data = mc->context;
3691 	if (!status) {
3692 		struct rdma_dev_addr *dev_addr =
3693 			&id_priv->id.route.addr.dev_addr;
3694 		struct net_device *ndev =
3695 			dev_get_by_index(&init_net, dev_addr->bound_dev_if);
3696 		enum ib_gid_type gid_type =
3697 			id_priv->cma_dev->default_gid_type[id_priv->id.port_num -
3698 			rdma_start_port(id_priv->cma_dev->device)];
3699 
3700 		event.event = RDMA_CM_EVENT_MULTICAST_JOIN;
3701 		ib_init_ah_from_mcmember(id_priv->id.device,
3702 					 id_priv->id.port_num, &multicast->rec,
3703 					 ndev, gid_type,
3704 					 &event.param.ud.ah_attr);
3705 		event.param.ud.qp_num = 0xFFFFFF;
3706 		event.param.ud.qkey = be32_to_cpu(multicast->rec.qkey);
3707 		if (ndev)
3708 			dev_put(ndev);
3709 	} else
3710 		event.event = RDMA_CM_EVENT_MULTICAST_ERROR;
3711 
3712 	ret = id_priv->id.event_handler(&id_priv->id, &event);
3713 	if (ret) {
3714 		cma_exch(id_priv, RDMA_CM_DESTROYING);
3715 		mutex_unlock(&id_priv->handler_mutex);
3716 		rdma_destroy_id(&id_priv->id);
3717 		return 0;
3718 	}
3719 
3720 out:
3721 	mutex_unlock(&id_priv->handler_mutex);
3722 	return 0;
3723 }
3724 
3725 static void cma_set_mgid(struct rdma_id_private *id_priv,
3726 			 struct sockaddr *addr, union ib_gid *mgid)
3727 {
3728 	unsigned char mc_map[MAX_ADDR_LEN];
3729 	struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
3730 	struct sockaddr_in *sin = (struct sockaddr_in *) addr;
3731 	struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) addr;
3732 
3733 	if (cma_any_addr(addr)) {
3734 		memset(mgid, 0, sizeof *mgid);
3735 	} else if ((addr->sa_family == AF_INET6) &&
3736 		   ((be32_to_cpu(sin6->sin6_addr.s6_addr32[0]) & 0xFFF0FFFF) ==
3737 								 0xFF10A01B)) {
3738 		/* IPv6 address is an SA assigned MGID. */
3739 		memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
3740 	} else if (addr->sa_family == AF_IB) {
3741 		memcpy(mgid, &((struct sockaddr_ib *) addr)->sib_addr, sizeof *mgid);
3742 	} else if ((addr->sa_family == AF_INET6)) {
3743 		ipv6_ib_mc_map(&sin6->sin6_addr, dev_addr->broadcast, mc_map);
3744 		if (id_priv->id.ps == RDMA_PS_UDP)
3745 			mc_map[7] = 0x01;	/* Use RDMA CM signature */
3746 		*mgid = *(union ib_gid *) (mc_map + 4);
3747 	} else {
3748 		ip_ib_mc_map(sin->sin_addr.s_addr, dev_addr->broadcast, mc_map);
3749 		if (id_priv->id.ps == RDMA_PS_UDP)
3750 			mc_map[7] = 0x01;	/* Use RDMA CM signature */
3751 		*mgid = *(union ib_gid *) (mc_map + 4);
3752 	}
3753 }
3754 
3755 static int cma_join_ib_multicast(struct rdma_id_private *id_priv,
3756 				 struct cma_multicast *mc)
3757 {
3758 	struct ib_sa_mcmember_rec rec;
3759 	struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
3760 	ib_sa_comp_mask comp_mask;
3761 	int ret;
3762 
3763 	ib_addr_get_mgid(dev_addr, &rec.mgid);
3764 	ret = ib_sa_get_mcmember_rec(id_priv->id.device, id_priv->id.port_num,
3765 				     &rec.mgid, &rec);
3766 	if (ret)
3767 		return ret;
3768 
3769 	ret = cma_set_qkey(id_priv, 0);
3770 	if (ret)
3771 		return ret;
3772 
3773 	cma_set_mgid(id_priv, (struct sockaddr *) &mc->addr, &rec.mgid);
3774 	rec.qkey = cpu_to_be32(id_priv->qkey);
3775 	rdma_addr_get_sgid(dev_addr, &rec.port_gid);
3776 	rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
3777 	rec.join_state = 1;
3778 
3779 	comp_mask = IB_SA_MCMEMBER_REC_MGID | IB_SA_MCMEMBER_REC_PORT_GID |
3780 		    IB_SA_MCMEMBER_REC_PKEY | IB_SA_MCMEMBER_REC_JOIN_STATE |
3781 		    IB_SA_MCMEMBER_REC_QKEY | IB_SA_MCMEMBER_REC_SL |
3782 		    IB_SA_MCMEMBER_REC_FLOW_LABEL |
3783 		    IB_SA_MCMEMBER_REC_TRAFFIC_CLASS;
3784 
3785 	if (id_priv->id.ps == RDMA_PS_IPOIB)
3786 		comp_mask |= IB_SA_MCMEMBER_REC_RATE |
3787 			     IB_SA_MCMEMBER_REC_RATE_SELECTOR |
3788 			     IB_SA_MCMEMBER_REC_MTU_SELECTOR |
3789 			     IB_SA_MCMEMBER_REC_MTU |
3790 			     IB_SA_MCMEMBER_REC_HOP_LIMIT;
3791 
3792 	mc->multicast.ib = ib_sa_join_multicast(&sa_client, id_priv->id.device,
3793 						id_priv->id.port_num, &rec,
3794 						comp_mask, GFP_KERNEL,
3795 						cma_ib_mc_handler, mc);
3796 	return PTR_ERR_OR_ZERO(mc->multicast.ib);
3797 }
3798 
3799 static void iboe_mcast_work_handler(struct work_struct *work)
3800 {
3801 	struct iboe_mcast_work *mw = container_of(work, struct iboe_mcast_work, work);
3802 	struct cma_multicast *mc = mw->mc;
3803 	struct ib_sa_multicast *m = mc->multicast.ib;
3804 
3805 	mc->multicast.ib->context = mc;
3806 	cma_ib_mc_handler(0, m);
3807 	kref_put(&mc->mcref, release_mc);
3808 	kfree(mw);
3809 }
3810 
3811 static void cma_iboe_set_mgid(struct sockaddr *addr, union ib_gid *mgid)
3812 {
3813 	struct sockaddr_in *sin = (struct sockaddr_in *)addr;
3814 	struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr;
3815 
3816 	if (cma_any_addr(addr)) {
3817 		memset(mgid, 0, sizeof *mgid);
3818 	} else if (addr->sa_family == AF_INET6) {
3819 		memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
3820 	} else {
3821 		mgid->raw[0] = 0xff;
3822 		mgid->raw[1] = 0x0e;
3823 		mgid->raw[2] = 0;
3824 		mgid->raw[3] = 0;
3825 		mgid->raw[4] = 0;
3826 		mgid->raw[5] = 0;
3827 		mgid->raw[6] = 0;
3828 		mgid->raw[7] = 0;
3829 		mgid->raw[8] = 0;
3830 		mgid->raw[9] = 0;
3831 		mgid->raw[10] = 0xff;
3832 		mgid->raw[11] = 0xff;
3833 		*(__be32 *)(&mgid->raw[12]) = sin->sin_addr.s_addr;
3834 	}
3835 }
3836 
3837 static int cma_iboe_join_multicast(struct rdma_id_private *id_priv,
3838 				   struct cma_multicast *mc)
3839 {
3840 	struct iboe_mcast_work *work;
3841 	struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
3842 	int err = 0;
3843 	struct sockaddr *addr = (struct sockaddr *)&mc->addr;
3844 	struct net_device *ndev = NULL;
3845 	enum ib_gid_type gid_type;
3846 
3847 	if (cma_zero_addr((struct sockaddr *)&mc->addr))
3848 		return -EINVAL;
3849 
3850 	work = kzalloc(sizeof *work, GFP_KERNEL);
3851 	if (!work)
3852 		return -ENOMEM;
3853 
3854 	mc->multicast.ib = kzalloc(sizeof(struct ib_sa_multicast), GFP_KERNEL);
3855 	if (!mc->multicast.ib) {
3856 		err = -ENOMEM;
3857 		goto out1;
3858 	}
3859 
3860 	cma_iboe_set_mgid(addr, &mc->multicast.ib->rec.mgid);
3861 
3862 	mc->multicast.ib->rec.pkey = cpu_to_be16(0xffff);
3863 	if (id_priv->id.ps == RDMA_PS_UDP)
3864 		mc->multicast.ib->rec.qkey = cpu_to_be32(RDMA_UDP_QKEY);
3865 
3866 	if (dev_addr->bound_dev_if)
3867 		ndev = dev_get_by_index(&init_net, dev_addr->bound_dev_if);
3868 	if (!ndev) {
3869 		err = -ENODEV;
3870 		goto out2;
3871 	}
3872 	mc->multicast.ib->rec.rate = iboe_get_rate(ndev);
3873 	mc->multicast.ib->rec.hop_limit = 1;
3874 	mc->multicast.ib->rec.mtu = iboe_get_mtu(ndev->mtu);
3875 
3876 	gid_type = id_priv->cma_dev->default_gid_type[id_priv->id.port_num -
3877 		   rdma_start_port(id_priv->cma_dev->device)];
3878 	if (addr->sa_family == AF_INET) {
3879 		if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP) {
3880 			mc->multicast.ib->rec.hop_limit = IPV6_DEFAULT_HOPLIMIT;
3881 			err = cma_igmp_send(ndev, &mc->multicast.ib->rec.mgid,
3882 					    true);
3883 			if (!err)
3884 				mc->igmp_joined = true;
3885 		}
3886 	} else {
3887 		if (gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP)
3888 			err = -ENOTSUPP;
3889 	}
3890 	dev_put(ndev);
3891 	if (err || !mc->multicast.ib->rec.mtu) {
3892 		if (!err)
3893 			err = -EINVAL;
3894 		goto out2;
3895 	}
3896 	rdma_ip2gid((struct sockaddr *)&id_priv->id.route.addr.src_addr,
3897 		    &mc->multicast.ib->rec.port_gid);
3898 	work->id = id_priv;
3899 	work->mc = mc;
3900 	INIT_WORK(&work->work, iboe_mcast_work_handler);
3901 	kref_get(&mc->mcref);
3902 	queue_work(cma_wq, &work->work);
3903 
3904 	return 0;
3905 
3906 out2:
3907 	kfree(mc->multicast.ib);
3908 out1:
3909 	kfree(work);
3910 	return err;
3911 }
3912 
3913 int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
3914 			void *context)
3915 {
3916 	struct rdma_id_private *id_priv;
3917 	struct cma_multicast *mc;
3918 	int ret;
3919 
3920 	id_priv = container_of(id, struct rdma_id_private, id);
3921 	if (!cma_comp(id_priv, RDMA_CM_ADDR_BOUND) &&
3922 	    !cma_comp(id_priv, RDMA_CM_ADDR_RESOLVED))
3923 		return -EINVAL;
3924 
3925 	mc = kmalloc(sizeof *mc, GFP_KERNEL);
3926 	if (!mc)
3927 		return -ENOMEM;
3928 
3929 	memcpy(&mc->addr, addr, rdma_addr_size(addr));
3930 	mc->context = context;
3931 	mc->id_priv = id_priv;
3932 	mc->igmp_joined = false;
3933 	spin_lock(&id_priv->lock);
3934 	list_add(&mc->list, &id_priv->mc_list);
3935 	spin_unlock(&id_priv->lock);
3936 
3937 	if (rdma_protocol_roce(id->device, id->port_num)) {
3938 		kref_init(&mc->mcref);
3939 		ret = cma_iboe_join_multicast(id_priv, mc);
3940 	} else if (rdma_cap_ib_mcast(id->device, id->port_num))
3941 		ret = cma_join_ib_multicast(id_priv, mc);
3942 	else
3943 		ret = -ENOSYS;
3944 
3945 	if (ret) {
3946 		spin_lock_irq(&id_priv->lock);
3947 		list_del(&mc->list);
3948 		spin_unlock_irq(&id_priv->lock);
3949 		kfree(mc);
3950 	}
3951 	return ret;
3952 }
3953 EXPORT_SYMBOL(rdma_join_multicast);
3954 
3955 void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr)
3956 {
3957 	struct rdma_id_private *id_priv;
3958 	struct cma_multicast *mc;
3959 
3960 	id_priv = container_of(id, struct rdma_id_private, id);
3961 	spin_lock_irq(&id_priv->lock);
3962 	list_for_each_entry(mc, &id_priv->mc_list, list) {
3963 		if (!memcmp(&mc->addr, addr, rdma_addr_size(addr))) {
3964 			list_del(&mc->list);
3965 			spin_unlock_irq(&id_priv->lock);
3966 
3967 			if (id->qp)
3968 				ib_detach_mcast(id->qp,
3969 						&mc->multicast.ib->rec.mgid,
3970 						be16_to_cpu(mc->multicast.ib->rec.mlid));
3971 
3972 			BUG_ON(id_priv->cma_dev->device != id->device);
3973 
3974 			if (rdma_cap_ib_mcast(id->device, id->port_num)) {
3975 				ib_sa_free_multicast(mc->multicast.ib);
3976 				kfree(mc);
3977 			} else if (rdma_protocol_roce(id->device, id->port_num)) {
3978 				if (mc->igmp_joined) {
3979 					struct rdma_dev_addr *dev_addr =
3980 						&id->route.addr.dev_addr;
3981 					struct net_device *ndev = NULL;
3982 
3983 					if (dev_addr->bound_dev_if)
3984 						ndev = dev_get_by_index(&init_net,
3985 									dev_addr->bound_dev_if);
3986 					if (ndev) {
3987 						cma_igmp_send(ndev,
3988 							      &mc->multicast.ib->rec.mgid,
3989 							      false);
3990 						dev_put(ndev);
3991 					}
3992 					mc->igmp_joined = false;
3993 				}
3994 				kref_put(&mc->mcref, release_mc);
3995 			}
3996 			return;
3997 		}
3998 	}
3999 	spin_unlock_irq(&id_priv->lock);
4000 }
4001 EXPORT_SYMBOL(rdma_leave_multicast);
4002 
4003 static int cma_netdev_change(struct net_device *ndev, struct rdma_id_private *id_priv)
4004 {
4005 	struct rdma_dev_addr *dev_addr;
4006 	struct cma_ndev_work *work;
4007 
4008 	dev_addr = &id_priv->id.route.addr.dev_addr;
4009 
4010 	if ((dev_addr->bound_dev_if == ndev->ifindex) &&
4011 	    (net_eq(dev_net(ndev), dev_addr->net)) &&
4012 	    memcmp(dev_addr->src_dev_addr, ndev->dev_addr, ndev->addr_len)) {
4013 		pr_info("RDMA CM addr change for ndev %s used by id %p\n",
4014 			ndev->name, &id_priv->id);
4015 		work = kzalloc(sizeof *work, GFP_KERNEL);
4016 		if (!work)
4017 			return -ENOMEM;
4018 
4019 		INIT_WORK(&work->work, cma_ndev_work_handler);
4020 		work->id = id_priv;
4021 		work->event.event = RDMA_CM_EVENT_ADDR_CHANGE;
4022 		atomic_inc(&id_priv->refcount);
4023 		queue_work(cma_wq, &work->work);
4024 	}
4025 
4026 	return 0;
4027 }
4028 
4029 static int cma_netdev_callback(struct notifier_block *self, unsigned long event,
4030 			       void *ptr)
4031 {
4032 	struct net_device *ndev = netdev_notifier_info_to_dev(ptr);
4033 	struct cma_device *cma_dev;
4034 	struct rdma_id_private *id_priv;
4035 	int ret = NOTIFY_DONE;
4036 
4037 	if (event != NETDEV_BONDING_FAILOVER)
4038 		return NOTIFY_DONE;
4039 
4040 	if (!(ndev->flags & IFF_MASTER) || !(ndev->priv_flags & IFF_BONDING))
4041 		return NOTIFY_DONE;
4042 
4043 	mutex_lock(&lock);
4044 	list_for_each_entry(cma_dev, &dev_list, list)
4045 		list_for_each_entry(id_priv, &cma_dev->id_list, list) {
4046 			ret = cma_netdev_change(ndev, id_priv);
4047 			if (ret)
4048 				goto out;
4049 		}
4050 
4051 out:
4052 	mutex_unlock(&lock);
4053 	return ret;
4054 }
4055 
4056 static struct notifier_block cma_nb = {
4057 	.notifier_call = cma_netdev_callback
4058 };
4059 
4060 static void cma_add_one(struct ib_device *device)
4061 {
4062 	struct cma_device *cma_dev;
4063 	struct rdma_id_private *id_priv;
4064 	unsigned int i;
4065 	unsigned long supported_gids = 0;
4066 
4067 	cma_dev = kmalloc(sizeof *cma_dev, GFP_KERNEL);
4068 	if (!cma_dev)
4069 		return;
4070 
4071 	cma_dev->device = device;
4072 	cma_dev->default_gid_type = kcalloc(device->phys_port_cnt,
4073 					    sizeof(*cma_dev->default_gid_type),
4074 					    GFP_KERNEL);
4075 	if (!cma_dev->default_gid_type) {
4076 		kfree(cma_dev);
4077 		return;
4078 	}
4079 	for (i = rdma_start_port(device); i <= rdma_end_port(device); i++) {
4080 		supported_gids = roce_gid_type_mask_support(device, i);
4081 		WARN_ON(!supported_gids);
4082 		cma_dev->default_gid_type[i - rdma_start_port(device)] =
4083 			find_first_bit(&supported_gids, BITS_PER_LONG);
4084 	}
4085 
4086 	init_completion(&cma_dev->comp);
4087 	atomic_set(&cma_dev->refcount, 1);
4088 	INIT_LIST_HEAD(&cma_dev->id_list);
4089 	ib_set_client_data(device, &cma_client, cma_dev);
4090 
4091 	mutex_lock(&lock);
4092 	list_add_tail(&cma_dev->list, &dev_list);
4093 	list_for_each_entry(id_priv, &listen_any_list, list)
4094 		cma_listen_on_dev(id_priv, cma_dev);
4095 	mutex_unlock(&lock);
4096 }
4097 
4098 static int cma_remove_id_dev(struct rdma_id_private *id_priv)
4099 {
4100 	struct rdma_cm_event event;
4101 	enum rdma_cm_state state;
4102 	int ret = 0;
4103 
4104 	/* Record that we want to remove the device */
4105 	state = cma_exch(id_priv, RDMA_CM_DEVICE_REMOVAL);
4106 	if (state == RDMA_CM_DESTROYING)
4107 		return 0;
4108 
4109 	cma_cancel_operation(id_priv, state);
4110 	mutex_lock(&id_priv->handler_mutex);
4111 
4112 	/* Check for destruction from another callback. */
4113 	if (!cma_comp(id_priv, RDMA_CM_DEVICE_REMOVAL))
4114 		goto out;
4115 
4116 	memset(&event, 0, sizeof event);
4117 	event.event = RDMA_CM_EVENT_DEVICE_REMOVAL;
4118 	ret = id_priv->id.event_handler(&id_priv->id, &event);
4119 out:
4120 	mutex_unlock(&id_priv->handler_mutex);
4121 	return ret;
4122 }
4123 
4124 static void cma_process_remove(struct cma_device *cma_dev)
4125 {
4126 	struct rdma_id_private *id_priv;
4127 	int ret;
4128 
4129 	mutex_lock(&lock);
4130 	while (!list_empty(&cma_dev->id_list)) {
4131 		id_priv = list_entry(cma_dev->id_list.next,
4132 				     struct rdma_id_private, list);
4133 
4134 		list_del(&id_priv->listen_list);
4135 		list_del_init(&id_priv->list);
4136 		atomic_inc(&id_priv->refcount);
4137 		mutex_unlock(&lock);
4138 
4139 		ret = id_priv->internal_id ? 1 : cma_remove_id_dev(id_priv);
4140 		cma_deref_id(id_priv);
4141 		if (ret)
4142 			rdma_destroy_id(&id_priv->id);
4143 
4144 		mutex_lock(&lock);
4145 	}
4146 	mutex_unlock(&lock);
4147 
4148 	cma_deref_dev(cma_dev);
4149 	wait_for_completion(&cma_dev->comp);
4150 }
4151 
4152 static void cma_remove_one(struct ib_device *device, void *client_data)
4153 {
4154 	struct cma_device *cma_dev = client_data;
4155 
4156 	if (!cma_dev)
4157 		return;
4158 
4159 	mutex_lock(&lock);
4160 	list_del(&cma_dev->list);
4161 	mutex_unlock(&lock);
4162 
4163 	cma_process_remove(cma_dev);
4164 	kfree(cma_dev->default_gid_type);
4165 	kfree(cma_dev);
4166 }
4167 
4168 static int cma_get_id_stats(struct sk_buff *skb, struct netlink_callback *cb)
4169 {
4170 	struct nlmsghdr *nlh;
4171 	struct rdma_cm_id_stats *id_stats;
4172 	struct rdma_id_private *id_priv;
4173 	struct rdma_cm_id *id = NULL;
4174 	struct cma_device *cma_dev;
4175 	int i_dev = 0, i_id = 0;
4176 
4177 	/*
4178 	 * We export all of the IDs as a sequence of messages.  Each
4179 	 * ID gets its own netlink message.
4180 	 */
4181 	mutex_lock(&lock);
4182 
4183 	list_for_each_entry(cma_dev, &dev_list, list) {
4184 		if (i_dev < cb->args[0]) {
4185 			i_dev++;
4186 			continue;
4187 		}
4188 
4189 		i_id = 0;
4190 		list_for_each_entry(id_priv, &cma_dev->id_list, list) {
4191 			if (i_id < cb->args[1]) {
4192 				i_id++;
4193 				continue;
4194 			}
4195 
4196 			id_stats = ibnl_put_msg(skb, &nlh, cb->nlh->nlmsg_seq,
4197 						sizeof *id_stats, RDMA_NL_RDMA_CM,
4198 						RDMA_NL_RDMA_CM_ID_STATS,
4199 						NLM_F_MULTI);
4200 			if (!id_stats)
4201 				goto out;
4202 
4203 			memset(id_stats, 0, sizeof *id_stats);
4204 			id = &id_priv->id;
4205 			id_stats->node_type = id->route.addr.dev_addr.dev_type;
4206 			id_stats->port_num = id->port_num;
4207 			id_stats->bound_dev_if =
4208 				id->route.addr.dev_addr.bound_dev_if;
4209 
4210 			if (ibnl_put_attr(skb, nlh,
4211 					  rdma_addr_size(cma_src_addr(id_priv)),
4212 					  cma_src_addr(id_priv),
4213 					  RDMA_NL_RDMA_CM_ATTR_SRC_ADDR))
4214 				goto out;
4215 			if (ibnl_put_attr(skb, nlh,
4216 					  rdma_addr_size(cma_src_addr(id_priv)),
4217 					  cma_dst_addr(id_priv),
4218 					  RDMA_NL_RDMA_CM_ATTR_DST_ADDR))
4219 				goto out;
4220 
4221 			id_stats->pid		= id_priv->owner;
4222 			id_stats->port_space	= id->ps;
4223 			id_stats->cm_state	= id_priv->state;
4224 			id_stats->qp_num	= id_priv->qp_num;
4225 			id_stats->qp_type	= id->qp_type;
4226 
4227 			i_id++;
4228 		}
4229 
4230 		cb->args[1] = 0;
4231 		i_dev++;
4232 	}
4233 
4234 out:
4235 	mutex_unlock(&lock);
4236 	cb->args[0] = i_dev;
4237 	cb->args[1] = i_id;
4238 
4239 	return skb->len;
4240 }
4241 
4242 static const struct ibnl_client_cbs cma_cb_table[] = {
4243 	[RDMA_NL_RDMA_CM_ID_STATS] = { .dump = cma_get_id_stats,
4244 				       .module = THIS_MODULE },
4245 };
4246 
4247 static int cma_init_net(struct net *net)
4248 {
4249 	struct cma_pernet *pernet = cma_pernet(net);
4250 
4251 	idr_init(&pernet->tcp_ps);
4252 	idr_init(&pernet->udp_ps);
4253 	idr_init(&pernet->ipoib_ps);
4254 	idr_init(&pernet->ib_ps);
4255 
4256 	return 0;
4257 }
4258 
4259 static void cma_exit_net(struct net *net)
4260 {
4261 	struct cma_pernet *pernet = cma_pernet(net);
4262 
4263 	idr_destroy(&pernet->tcp_ps);
4264 	idr_destroy(&pernet->udp_ps);
4265 	idr_destroy(&pernet->ipoib_ps);
4266 	idr_destroy(&pernet->ib_ps);
4267 }
4268 
4269 static struct pernet_operations cma_pernet_operations = {
4270 	.init = cma_init_net,
4271 	.exit = cma_exit_net,
4272 	.id = &cma_pernet_id,
4273 	.size = sizeof(struct cma_pernet),
4274 };
4275 
4276 static int __init cma_init(void)
4277 {
4278 	int ret;
4279 
4280 	cma_wq = create_singlethread_workqueue("rdma_cm");
4281 	if (!cma_wq)
4282 		return -ENOMEM;
4283 
4284 	ret = register_pernet_subsys(&cma_pernet_operations);
4285 	if (ret)
4286 		goto err_wq;
4287 
4288 	ib_sa_register_client(&sa_client);
4289 	rdma_addr_register_client(&addr_client);
4290 	register_netdevice_notifier(&cma_nb);
4291 
4292 	ret = ib_register_client(&cma_client);
4293 	if (ret)
4294 		goto err;
4295 
4296 	if (ibnl_add_client(RDMA_NL_RDMA_CM, ARRAY_SIZE(cma_cb_table),
4297 			    cma_cb_table))
4298 		pr_warn("RDMA CMA: failed to add netlink callback\n");
4299 	cma_configfs_init();
4300 
4301 	return 0;
4302 
4303 err:
4304 	unregister_netdevice_notifier(&cma_nb);
4305 	rdma_addr_unregister_client(&addr_client);
4306 	ib_sa_unregister_client(&sa_client);
4307 err_wq:
4308 	destroy_workqueue(cma_wq);
4309 	return ret;
4310 }
4311 
4312 static void __exit cma_cleanup(void)
4313 {
4314 	cma_configfs_exit();
4315 	ibnl_remove_client(RDMA_NL_RDMA_CM);
4316 	ib_unregister_client(&cma_client);
4317 	unregister_netdevice_notifier(&cma_nb);
4318 	rdma_addr_unregister_client(&addr_client);
4319 	ib_sa_unregister_client(&sa_client);
4320 	unregister_pernet_subsys(&cma_pernet_operations);
4321 	destroy_workqueue(cma_wq);
4322 }
4323 
4324 module_init(cma_init);
4325 module_exit(cma_cleanup);
4326