1 /*
2 * Copyright (c) 2005 Voltaire Inc. All rights reserved.
3 * Copyright (c) 2002-2005, Network Appliance, Inc. All rights reserved.
4 * Copyright (c) 1999-2005, Mellanox Technologies, Inc. All rights reserved.
5 * Copyright (c) 2005-2006 Intel Corporation. All rights reserved.
6 *
7 * This software is available to you under a choice of one of two
8 * licenses. You may choose to be licensed under the terms of the GNU
9 * General Public License (GPL) Version 2, available from the file
10 * COPYING in the main directory of this source tree, or the
11 * OpenIB.org BSD license below:
12 *
13 * Redistribution and use in source and binary forms, with or
14 * without modification, are permitted provided that the following
15 * conditions are met:
16 *
17 * - Redistributions of source code must retain the above
18 * copyright notice, this list of conditions and the following
19 * disclaimer.
20 *
21 * - Redistributions in binary form must reproduce the above
22 * copyright notice, this list of conditions and the following
23 * disclaimer in the documentation and/or other materials
24 * provided with the distribution.
25 *
26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
33 * SOFTWARE.
34 */
35
36 #include <linux/completion.h>
37 #include <linux/in.h>
38 #include <linux/in6.h>
39 #include <linux/mutex.h>
40 #include <linux/random.h>
41 #include <linux/idr.h>
42 #include <linux/inetdevice.h>
43 #include <linux/slab.h>
44
45 #include <net/tcp.h>
46 #include <net/ipv6.h>
47
48 #include <rdma/rdma_cm.h>
49 #include <rdma/rdma_cm_ib.h>
50 #include <rdma/ib_cache.h>
51 #include <rdma/ib_cm.h>
52 #include <rdma/ib_sa.h>
53 #include <rdma/iw_cm.h>
54
55 MODULE_AUTHOR("Sean Hefty");
56 MODULE_DESCRIPTION("Generic RDMA CM Agent");
57 MODULE_LICENSE("Dual BSD/GPL");
58
59 #define CMA_CM_RESPONSE_TIMEOUT 20
60 #define CMA_MAX_CM_RETRIES 15
61 #define CMA_CM_MRA_SETTING (IB_CM_MRA_FLAG_DELAY | 24)
62 #define CMA_IBOE_PACKET_LIFETIME 18
63
64 static void cma_add_one(struct ib_device *device);
65 static void cma_remove_one(struct ib_device *device);
66
67 static struct ib_client cma_client = {
68 .name = "cma",
69 .add = cma_add_one,
70 .remove = cma_remove_one
71 };
72
73 static struct ib_sa_client sa_client;
74 static struct rdma_addr_client addr_client;
75 static LIST_HEAD(dev_list);
76 static LIST_HEAD(listen_any_list);
77 static DEFINE_MUTEX(lock);
78 static struct workqueue_struct *cma_wq;
79 static DEFINE_IDR(sdp_ps);
80 static DEFINE_IDR(tcp_ps);
81 static DEFINE_IDR(udp_ps);
82 static DEFINE_IDR(ipoib_ps);
83
84 struct cma_device {
85 struct list_head list;
86 struct ib_device *device;
87 struct completion comp;
88 atomic_t refcount;
89 struct list_head id_list;
90 };
91
92 enum cma_state {
93 CMA_IDLE,
94 CMA_ADDR_QUERY,
95 CMA_ADDR_RESOLVED,
96 CMA_ROUTE_QUERY,
97 CMA_ROUTE_RESOLVED,
98 CMA_CONNECT,
99 CMA_DISCONNECT,
100 CMA_ADDR_BOUND,
101 CMA_LISTEN,
102 CMA_DEVICE_REMOVAL,
103 CMA_DESTROYING
104 };
105
106 struct rdma_bind_list {
107 struct idr *ps;
108 struct hlist_head owners;
109 unsigned short port;
110 };
111
112 /*
113 * Device removal can occur at anytime, so we need extra handling to
114 * serialize notifying the user of device removal with other callbacks.
115 * We do this by disabling removal notification while a callback is in process,
116 * and reporting it after the callback completes.
117 */
118 struct rdma_id_private {
119 struct rdma_cm_id id;
120
121 struct rdma_bind_list *bind_list;
122 struct hlist_node node;
123 struct list_head list; /* listen_any_list or cma_device.list */
124 struct list_head listen_list; /* per device listens */
125 struct cma_device *cma_dev;
126 struct list_head mc_list;
127
128 int internal_id;
129 enum cma_state state;
130 spinlock_t lock;
131 struct mutex qp_mutex;
132
133 struct completion comp;
134 atomic_t refcount;
135 struct mutex handler_mutex;
136
137 int backlog;
138 int timeout_ms;
139 struct ib_sa_query *query;
140 int query_id;
141 union {
142 struct ib_cm_id *ib;
143 struct iw_cm_id *iw;
144 } cm_id;
145
146 u32 seq_num;
147 u32 qkey;
148 u32 qp_num;
149 u8 srq;
150 u8 tos;
151 };
152
153 struct cma_multicast {
154 struct rdma_id_private *id_priv;
155 union {
156 struct ib_sa_multicast *ib;
157 } multicast;
158 struct list_head list;
159 void *context;
160 struct sockaddr_storage addr;
161 struct kref mcref;
162 };
163
164 struct cma_work {
165 struct work_struct work;
166 struct rdma_id_private *id;
167 enum cma_state old_state;
168 enum cma_state new_state;
169 struct rdma_cm_event event;
170 };
171
172 struct cma_ndev_work {
173 struct work_struct work;
174 struct rdma_id_private *id;
175 struct rdma_cm_event event;
176 };
177
178 struct iboe_mcast_work {
179 struct work_struct work;
180 struct rdma_id_private *id;
181 struct cma_multicast *mc;
182 };
183
184 union cma_ip_addr {
185 struct in6_addr ip6;
186 struct {
187 __be32 pad[3];
188 __be32 addr;
189 } ip4;
190 };
191
192 struct cma_hdr {
193 u8 cma_version;
194 u8 ip_version; /* IP version: 7:4 */
195 __be16 port;
196 union cma_ip_addr src_addr;
197 union cma_ip_addr dst_addr;
198 };
199
200 struct sdp_hh {
201 u8 bsdh[16];
202 u8 sdp_version; /* Major version: 7:4 */
203 u8 ip_version; /* IP version: 7:4 */
204 u8 sdp_specific1[10];
205 __be16 port;
206 __be16 sdp_specific2;
207 union cma_ip_addr src_addr;
208 union cma_ip_addr dst_addr;
209 };
210
211 struct sdp_hah {
212 u8 bsdh[16];
213 u8 sdp_version;
214 };
215
216 #define CMA_VERSION 0x00
217 #define SDP_MAJ_VERSION 0x2
218
cma_comp(struct rdma_id_private * id_priv,enum cma_state comp)219 static int cma_comp(struct rdma_id_private *id_priv, enum cma_state comp)
220 {
221 unsigned long flags;
222 int ret;
223
224 spin_lock_irqsave(&id_priv->lock, flags);
225 ret = (id_priv->state == comp);
226 spin_unlock_irqrestore(&id_priv->lock, flags);
227 return ret;
228 }
229
cma_comp_exch(struct rdma_id_private * id_priv,enum cma_state comp,enum cma_state exch)230 static int cma_comp_exch(struct rdma_id_private *id_priv,
231 enum cma_state comp, enum cma_state exch)
232 {
233 unsigned long flags;
234 int ret;
235
236 spin_lock_irqsave(&id_priv->lock, flags);
237 if ((ret = (id_priv->state == comp)))
238 id_priv->state = exch;
239 spin_unlock_irqrestore(&id_priv->lock, flags);
240 return ret;
241 }
242
cma_exch(struct rdma_id_private * id_priv,enum cma_state exch)243 static enum cma_state cma_exch(struct rdma_id_private *id_priv,
244 enum cma_state exch)
245 {
246 unsigned long flags;
247 enum cma_state old;
248
249 spin_lock_irqsave(&id_priv->lock, flags);
250 old = id_priv->state;
251 id_priv->state = exch;
252 spin_unlock_irqrestore(&id_priv->lock, flags);
253 return old;
254 }
255
cma_get_ip_ver(struct cma_hdr * hdr)256 static inline u8 cma_get_ip_ver(struct cma_hdr *hdr)
257 {
258 return hdr->ip_version >> 4;
259 }
260
cma_set_ip_ver(struct cma_hdr * hdr,u8 ip_ver)261 static inline void cma_set_ip_ver(struct cma_hdr *hdr, u8 ip_ver)
262 {
263 hdr->ip_version = (ip_ver << 4) | (hdr->ip_version & 0xF);
264 }
265
sdp_get_majv(u8 sdp_version)266 static inline u8 sdp_get_majv(u8 sdp_version)
267 {
268 return sdp_version >> 4;
269 }
270
sdp_get_ip_ver(struct sdp_hh * hh)271 static inline u8 sdp_get_ip_ver(struct sdp_hh *hh)
272 {
273 return hh->ip_version >> 4;
274 }
275
sdp_set_ip_ver(struct sdp_hh * hh,u8 ip_ver)276 static inline void sdp_set_ip_ver(struct sdp_hh *hh, u8 ip_ver)
277 {
278 hh->ip_version = (ip_ver << 4) | (hh->ip_version & 0xF);
279 }
280
cma_is_ud_ps(enum rdma_port_space ps)281 static inline int cma_is_ud_ps(enum rdma_port_space ps)
282 {
283 return (ps == RDMA_PS_UDP || ps == RDMA_PS_IPOIB);
284 }
285
cma_attach_to_dev(struct rdma_id_private * id_priv,struct cma_device * cma_dev)286 static void cma_attach_to_dev(struct rdma_id_private *id_priv,
287 struct cma_device *cma_dev)
288 {
289 atomic_inc(&cma_dev->refcount);
290 id_priv->cma_dev = cma_dev;
291 id_priv->id.device = cma_dev->device;
292 id_priv->id.route.addr.dev_addr.transport =
293 rdma_node_get_transport(cma_dev->device->node_type);
294 list_add_tail(&id_priv->list, &cma_dev->id_list);
295 }
296
cma_deref_dev(struct cma_device * cma_dev)297 static inline void cma_deref_dev(struct cma_device *cma_dev)
298 {
299 if (atomic_dec_and_test(&cma_dev->refcount))
300 complete(&cma_dev->comp);
301 }
302
release_mc(struct kref * kref)303 static inline void release_mc(struct kref *kref)
304 {
305 struct cma_multicast *mc = container_of(kref, struct cma_multicast, mcref);
306
307 kfree(mc->multicast.ib);
308 kfree(mc);
309 }
310
cma_release_dev(struct rdma_id_private * id_priv)311 static void cma_release_dev(struct rdma_id_private *id_priv)
312 {
313 mutex_lock(&lock);
314 list_del(&id_priv->list);
315 cma_deref_dev(id_priv->cma_dev);
316 id_priv->cma_dev = NULL;
317 mutex_unlock(&lock);
318 }
319
cma_set_qkey(struct rdma_id_private * id_priv)320 static int cma_set_qkey(struct rdma_id_private *id_priv)
321 {
322 struct ib_sa_mcmember_rec rec;
323 int ret = 0;
324
325 if (id_priv->qkey)
326 return 0;
327
328 switch (id_priv->id.ps) {
329 case RDMA_PS_UDP:
330 id_priv->qkey = RDMA_UDP_QKEY;
331 break;
332 case RDMA_PS_IPOIB:
333 ib_addr_get_mgid(&id_priv->id.route.addr.dev_addr, &rec.mgid);
334 ret = ib_sa_get_mcmember_rec(id_priv->id.device,
335 id_priv->id.port_num, &rec.mgid,
336 &rec);
337 if (!ret)
338 id_priv->qkey = be32_to_cpu(rec.qkey);
339 break;
340 default:
341 break;
342 }
343 return ret;
344 }
345
find_gid_port(struct ib_device * device,union ib_gid * gid,u8 port_num)346 static int find_gid_port(struct ib_device *device, union ib_gid *gid, u8 port_num)
347 {
348 int i;
349 int err;
350 struct ib_port_attr props;
351 union ib_gid tmp;
352
353 err = ib_query_port(device, port_num, &props);
354 if (err)
355 return 1;
356
357 for (i = 0; i < props.gid_tbl_len; ++i) {
358 err = ib_query_gid(device, port_num, i, &tmp);
359 if (err)
360 return 1;
361 if (!memcmp(&tmp, gid, sizeof tmp))
362 return 0;
363 }
364
365 return -EAGAIN;
366 }
367
cma_acquire_dev(struct rdma_id_private * id_priv)368 static int cma_acquire_dev(struct rdma_id_private *id_priv)
369 {
370 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
371 struct cma_device *cma_dev;
372 union ib_gid gid, iboe_gid;
373 int ret = -ENODEV;
374 u8 port;
375 enum rdma_link_layer dev_ll = dev_addr->dev_type == ARPHRD_INFINIBAND ?
376 IB_LINK_LAYER_INFINIBAND : IB_LINK_LAYER_ETHERNET;
377
378 mutex_lock(&lock);
379 iboe_addr_get_sgid(dev_addr, &iboe_gid);
380 memcpy(&gid, dev_addr->src_dev_addr +
381 rdma_addr_gid_offset(dev_addr), sizeof gid);
382 list_for_each_entry(cma_dev, &dev_list, list) {
383 for (port = 1; port <= cma_dev->device->phys_port_cnt; ++port) {
384 if (rdma_port_get_link_layer(cma_dev->device, port) == dev_ll) {
385 if (rdma_node_get_transport(cma_dev->device->node_type) == RDMA_TRANSPORT_IB &&
386 rdma_port_get_link_layer(cma_dev->device, port) == IB_LINK_LAYER_ETHERNET)
387 ret = find_gid_port(cma_dev->device, &iboe_gid, port);
388 else
389 ret = find_gid_port(cma_dev->device, &gid, port);
390
391 if (!ret) {
392 id_priv->id.port_num = port;
393 goto out;
394 } else if (ret == 1)
395 break;
396 }
397 }
398 }
399
400 out:
401 if (!ret)
402 cma_attach_to_dev(id_priv, cma_dev);
403
404 mutex_unlock(&lock);
405 return ret;
406 }
407
cma_deref_id(struct rdma_id_private * id_priv)408 static void cma_deref_id(struct rdma_id_private *id_priv)
409 {
410 if (atomic_dec_and_test(&id_priv->refcount))
411 complete(&id_priv->comp);
412 }
413
cma_disable_callback(struct rdma_id_private * id_priv,enum cma_state state)414 static int cma_disable_callback(struct rdma_id_private *id_priv,
415 enum cma_state state)
416 {
417 mutex_lock(&id_priv->handler_mutex);
418 if (id_priv->state != state) {
419 mutex_unlock(&id_priv->handler_mutex);
420 return -EINVAL;
421 }
422 return 0;
423 }
424
cma_has_cm_dev(struct rdma_id_private * id_priv)425 static int cma_has_cm_dev(struct rdma_id_private *id_priv)
426 {
427 return (id_priv->id.device && id_priv->cm_id.ib);
428 }
429
rdma_create_id(rdma_cm_event_handler event_handler,void * context,enum rdma_port_space ps)430 struct rdma_cm_id *rdma_create_id(rdma_cm_event_handler event_handler,
431 void *context, enum rdma_port_space ps)
432 {
433 struct rdma_id_private *id_priv;
434
435 id_priv = kzalloc(sizeof *id_priv, GFP_KERNEL);
436 if (!id_priv)
437 return ERR_PTR(-ENOMEM);
438
439 id_priv->state = CMA_IDLE;
440 id_priv->id.context = context;
441 id_priv->id.event_handler = event_handler;
442 id_priv->id.ps = ps;
443 spin_lock_init(&id_priv->lock);
444 mutex_init(&id_priv->qp_mutex);
445 init_completion(&id_priv->comp);
446 atomic_set(&id_priv->refcount, 1);
447 mutex_init(&id_priv->handler_mutex);
448 INIT_LIST_HEAD(&id_priv->listen_list);
449 INIT_LIST_HEAD(&id_priv->mc_list);
450 get_random_bytes(&id_priv->seq_num, sizeof id_priv->seq_num);
451
452 return &id_priv->id;
453 }
454 EXPORT_SYMBOL(rdma_create_id);
455
cma_init_ud_qp(struct rdma_id_private * id_priv,struct ib_qp * qp)456 static int cma_init_ud_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
457 {
458 struct ib_qp_attr qp_attr;
459 int qp_attr_mask, ret;
460
461 qp_attr.qp_state = IB_QPS_INIT;
462 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
463 if (ret)
464 return ret;
465
466 ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask);
467 if (ret)
468 return ret;
469
470 qp_attr.qp_state = IB_QPS_RTR;
471 ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE);
472 if (ret)
473 return ret;
474
475 qp_attr.qp_state = IB_QPS_RTS;
476 qp_attr.sq_psn = 0;
477 ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE | IB_QP_SQ_PSN);
478
479 return ret;
480 }
481
cma_init_conn_qp(struct rdma_id_private * id_priv,struct ib_qp * qp)482 static int cma_init_conn_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
483 {
484 struct ib_qp_attr qp_attr;
485 int qp_attr_mask, ret;
486
487 qp_attr.qp_state = IB_QPS_INIT;
488 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
489 if (ret)
490 return ret;
491
492 return ib_modify_qp(qp, &qp_attr, qp_attr_mask);
493 }
494
rdma_create_qp(struct rdma_cm_id * id,struct ib_pd * pd,struct ib_qp_init_attr * qp_init_attr)495 int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd,
496 struct ib_qp_init_attr *qp_init_attr)
497 {
498 struct rdma_id_private *id_priv;
499 struct ib_qp *qp;
500 int ret;
501
502 id_priv = container_of(id, struct rdma_id_private, id);
503 if (id->device != pd->device)
504 return -EINVAL;
505
506 qp = ib_create_qp(pd, qp_init_attr);
507 if (IS_ERR(qp))
508 return PTR_ERR(qp);
509
510 if (cma_is_ud_ps(id_priv->id.ps))
511 ret = cma_init_ud_qp(id_priv, qp);
512 else
513 ret = cma_init_conn_qp(id_priv, qp);
514 if (ret)
515 goto err;
516
517 id->qp = qp;
518 id_priv->qp_num = qp->qp_num;
519 id_priv->srq = (qp->srq != NULL);
520 return 0;
521 err:
522 ib_destroy_qp(qp);
523 return ret;
524 }
525 EXPORT_SYMBOL(rdma_create_qp);
526
rdma_destroy_qp(struct rdma_cm_id * id)527 void rdma_destroy_qp(struct rdma_cm_id *id)
528 {
529 struct rdma_id_private *id_priv;
530
531 id_priv = container_of(id, struct rdma_id_private, id);
532 mutex_lock(&id_priv->qp_mutex);
533 ib_destroy_qp(id_priv->id.qp);
534 id_priv->id.qp = NULL;
535 mutex_unlock(&id_priv->qp_mutex);
536 }
537 EXPORT_SYMBOL(rdma_destroy_qp);
538
cma_modify_qp_rtr(struct rdma_id_private * id_priv,struct rdma_conn_param * conn_param)539 static int cma_modify_qp_rtr(struct rdma_id_private *id_priv,
540 struct rdma_conn_param *conn_param)
541 {
542 struct ib_qp_attr qp_attr;
543 int qp_attr_mask, ret;
544
545 mutex_lock(&id_priv->qp_mutex);
546 if (!id_priv->id.qp) {
547 ret = 0;
548 goto out;
549 }
550
551 /* Need to update QP attributes from default values. */
552 qp_attr.qp_state = IB_QPS_INIT;
553 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
554 if (ret)
555 goto out;
556
557 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
558 if (ret)
559 goto out;
560
561 qp_attr.qp_state = IB_QPS_RTR;
562 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
563 if (ret)
564 goto out;
565
566 if (conn_param)
567 qp_attr.max_dest_rd_atomic = conn_param->responder_resources;
568 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
569 out:
570 mutex_unlock(&id_priv->qp_mutex);
571 return ret;
572 }
573
cma_modify_qp_rts(struct rdma_id_private * id_priv,struct rdma_conn_param * conn_param)574 static int cma_modify_qp_rts(struct rdma_id_private *id_priv,
575 struct rdma_conn_param *conn_param)
576 {
577 struct ib_qp_attr qp_attr;
578 int qp_attr_mask, ret;
579
580 mutex_lock(&id_priv->qp_mutex);
581 if (!id_priv->id.qp) {
582 ret = 0;
583 goto out;
584 }
585
586 qp_attr.qp_state = IB_QPS_RTS;
587 ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask);
588 if (ret)
589 goto out;
590
591 if (conn_param)
592 qp_attr.max_rd_atomic = conn_param->initiator_depth;
593 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask);
594 out:
595 mutex_unlock(&id_priv->qp_mutex);
596 return ret;
597 }
598
cma_modify_qp_err(struct rdma_id_private * id_priv)599 static int cma_modify_qp_err(struct rdma_id_private *id_priv)
600 {
601 struct ib_qp_attr qp_attr;
602 int ret;
603
604 mutex_lock(&id_priv->qp_mutex);
605 if (!id_priv->id.qp) {
606 ret = 0;
607 goto out;
608 }
609
610 qp_attr.qp_state = IB_QPS_ERR;
611 ret = ib_modify_qp(id_priv->id.qp, &qp_attr, IB_QP_STATE);
612 out:
613 mutex_unlock(&id_priv->qp_mutex);
614 return ret;
615 }
616
cma_ib_init_qp_attr(struct rdma_id_private * id_priv,struct ib_qp_attr * qp_attr,int * qp_attr_mask)617 static int cma_ib_init_qp_attr(struct rdma_id_private *id_priv,
618 struct ib_qp_attr *qp_attr, int *qp_attr_mask)
619 {
620 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
621 int ret;
622 u16 pkey;
623
624 if (rdma_port_get_link_layer(id_priv->id.device, id_priv->id.port_num) ==
625 IB_LINK_LAYER_INFINIBAND)
626 pkey = ib_addr_get_pkey(dev_addr);
627 else
628 pkey = 0xffff;
629
630 ret = ib_find_cached_pkey(id_priv->id.device, id_priv->id.port_num,
631 pkey, &qp_attr->pkey_index);
632 if (ret)
633 return ret;
634
635 qp_attr->port_num = id_priv->id.port_num;
636 *qp_attr_mask = IB_QP_STATE | IB_QP_PKEY_INDEX | IB_QP_PORT;
637
638 if (cma_is_ud_ps(id_priv->id.ps)) {
639 ret = cma_set_qkey(id_priv);
640 if (ret)
641 return ret;
642
643 qp_attr->qkey = id_priv->qkey;
644 *qp_attr_mask |= IB_QP_QKEY;
645 } else {
646 qp_attr->qp_access_flags = 0;
647 *qp_attr_mask |= IB_QP_ACCESS_FLAGS;
648 }
649 return 0;
650 }
651
rdma_init_qp_attr(struct rdma_cm_id * id,struct ib_qp_attr * qp_attr,int * qp_attr_mask)652 int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
653 int *qp_attr_mask)
654 {
655 struct rdma_id_private *id_priv;
656 int ret = 0;
657
658 id_priv = container_of(id, struct rdma_id_private, id);
659 switch (rdma_node_get_transport(id_priv->id.device->node_type)) {
660 case RDMA_TRANSPORT_IB:
661 if (!id_priv->cm_id.ib || cma_is_ud_ps(id_priv->id.ps))
662 ret = cma_ib_init_qp_attr(id_priv, qp_attr, qp_attr_mask);
663 else
664 ret = ib_cm_init_qp_attr(id_priv->cm_id.ib, qp_attr,
665 qp_attr_mask);
666 if (qp_attr->qp_state == IB_QPS_RTR)
667 qp_attr->rq_psn = id_priv->seq_num;
668 break;
669 case RDMA_TRANSPORT_IWARP:
670 if (!id_priv->cm_id.iw) {
671 qp_attr->qp_access_flags = 0;
672 *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS;
673 } else
674 ret = iw_cm_init_qp_attr(id_priv->cm_id.iw, qp_attr,
675 qp_attr_mask);
676 break;
677 default:
678 ret = -ENOSYS;
679 break;
680 }
681
682 return ret;
683 }
684 EXPORT_SYMBOL(rdma_init_qp_attr);
685
cma_zero_addr(struct sockaddr * addr)686 static inline int cma_zero_addr(struct sockaddr *addr)
687 {
688 struct in6_addr *ip6;
689
690 if (addr->sa_family == AF_INET)
691 return ipv4_is_zeronet(
692 ((struct sockaddr_in *)addr)->sin_addr.s_addr);
693 else {
694 ip6 = &((struct sockaddr_in6 *) addr)->sin6_addr;
695 return (ip6->s6_addr32[0] | ip6->s6_addr32[1] |
696 ip6->s6_addr32[2] | ip6->s6_addr32[3]) == 0;
697 }
698 }
699
cma_loopback_addr(struct sockaddr * addr)700 static inline int cma_loopback_addr(struct sockaddr *addr)
701 {
702 if (addr->sa_family == AF_INET)
703 return ipv4_is_loopback(
704 ((struct sockaddr_in *) addr)->sin_addr.s_addr);
705 else
706 return ipv6_addr_loopback(
707 &((struct sockaddr_in6 *) addr)->sin6_addr);
708 }
709
cma_any_addr(struct sockaddr * addr)710 static inline int cma_any_addr(struct sockaddr *addr)
711 {
712 return cma_zero_addr(addr) || cma_loopback_addr(addr);
713 }
714
cma_port(struct sockaddr * addr)715 static inline __be16 cma_port(struct sockaddr *addr)
716 {
717 if (addr->sa_family == AF_INET)
718 return ((struct sockaddr_in *) addr)->sin_port;
719 else
720 return ((struct sockaddr_in6 *) addr)->sin6_port;
721 }
722
cma_any_port(struct sockaddr * addr)723 static inline int cma_any_port(struct sockaddr *addr)
724 {
725 return !cma_port(addr);
726 }
727
cma_get_net_info(void * hdr,enum rdma_port_space ps,u8 * ip_ver,__be16 * port,union cma_ip_addr ** src,union cma_ip_addr ** dst)728 static int cma_get_net_info(void *hdr, enum rdma_port_space ps,
729 u8 *ip_ver, __be16 *port,
730 union cma_ip_addr **src, union cma_ip_addr **dst)
731 {
732 switch (ps) {
733 case RDMA_PS_SDP:
734 if (sdp_get_majv(((struct sdp_hh *) hdr)->sdp_version) !=
735 SDP_MAJ_VERSION)
736 return -EINVAL;
737
738 *ip_ver = sdp_get_ip_ver(hdr);
739 *port = ((struct sdp_hh *) hdr)->port;
740 *src = &((struct sdp_hh *) hdr)->src_addr;
741 *dst = &((struct sdp_hh *) hdr)->dst_addr;
742 break;
743 default:
744 if (((struct cma_hdr *) hdr)->cma_version != CMA_VERSION)
745 return -EINVAL;
746
747 *ip_ver = cma_get_ip_ver(hdr);
748 *port = ((struct cma_hdr *) hdr)->port;
749 *src = &((struct cma_hdr *) hdr)->src_addr;
750 *dst = &((struct cma_hdr *) hdr)->dst_addr;
751 break;
752 }
753
754 if (*ip_ver != 4 && *ip_ver != 6)
755 return -EINVAL;
756 return 0;
757 }
758
cma_save_net_info(struct rdma_addr * addr,struct rdma_addr * listen_addr,u8 ip_ver,__be16 port,union cma_ip_addr * src,union cma_ip_addr * dst)759 static void cma_save_net_info(struct rdma_addr *addr,
760 struct rdma_addr *listen_addr,
761 u8 ip_ver, __be16 port,
762 union cma_ip_addr *src, union cma_ip_addr *dst)
763 {
764 struct sockaddr_in *listen4, *ip4;
765 struct sockaddr_in6 *listen6, *ip6;
766
767 switch (ip_ver) {
768 case 4:
769 listen4 = (struct sockaddr_in *) &listen_addr->src_addr;
770 ip4 = (struct sockaddr_in *) &addr->src_addr;
771 ip4->sin_family = listen4->sin_family;
772 ip4->sin_addr.s_addr = dst->ip4.addr;
773 ip4->sin_port = listen4->sin_port;
774
775 ip4 = (struct sockaddr_in *) &addr->dst_addr;
776 ip4->sin_family = listen4->sin_family;
777 ip4->sin_addr.s_addr = src->ip4.addr;
778 ip4->sin_port = port;
779 break;
780 case 6:
781 listen6 = (struct sockaddr_in6 *) &listen_addr->src_addr;
782 ip6 = (struct sockaddr_in6 *) &addr->src_addr;
783 ip6->sin6_family = listen6->sin6_family;
784 ip6->sin6_addr = dst->ip6;
785 ip6->sin6_port = listen6->sin6_port;
786
787 ip6 = (struct sockaddr_in6 *) &addr->dst_addr;
788 ip6->sin6_family = listen6->sin6_family;
789 ip6->sin6_addr = src->ip6;
790 ip6->sin6_port = port;
791 break;
792 default:
793 break;
794 }
795 }
796
cma_user_data_offset(enum rdma_port_space ps)797 static inline int cma_user_data_offset(enum rdma_port_space ps)
798 {
799 switch (ps) {
800 case RDMA_PS_SDP:
801 return 0;
802 default:
803 return sizeof(struct cma_hdr);
804 }
805 }
806
cma_cancel_route(struct rdma_id_private * id_priv)807 static void cma_cancel_route(struct rdma_id_private *id_priv)
808 {
809 switch (rdma_port_get_link_layer(id_priv->id.device, id_priv->id.port_num)) {
810 case IB_LINK_LAYER_INFINIBAND:
811 if (id_priv->query)
812 ib_sa_cancel_query(id_priv->query_id, id_priv->query);
813 break;
814 default:
815 break;
816 }
817 }
818
cma_cancel_listens(struct rdma_id_private * id_priv)819 static void cma_cancel_listens(struct rdma_id_private *id_priv)
820 {
821 struct rdma_id_private *dev_id_priv;
822
823 /*
824 * Remove from listen_any_list to prevent added devices from spawning
825 * additional listen requests.
826 */
827 mutex_lock(&lock);
828 list_del(&id_priv->list);
829
830 while (!list_empty(&id_priv->listen_list)) {
831 dev_id_priv = list_entry(id_priv->listen_list.next,
832 struct rdma_id_private, listen_list);
833 /* sync with device removal to avoid duplicate destruction */
834 list_del_init(&dev_id_priv->list);
835 list_del(&dev_id_priv->listen_list);
836 mutex_unlock(&lock);
837
838 rdma_destroy_id(&dev_id_priv->id);
839 mutex_lock(&lock);
840 }
841 mutex_unlock(&lock);
842 }
843
cma_cancel_operation(struct rdma_id_private * id_priv,enum cma_state state)844 static void cma_cancel_operation(struct rdma_id_private *id_priv,
845 enum cma_state state)
846 {
847 switch (state) {
848 case CMA_ADDR_QUERY:
849 rdma_addr_cancel(&id_priv->id.route.addr.dev_addr);
850 break;
851 case CMA_ROUTE_QUERY:
852 cma_cancel_route(id_priv);
853 break;
854 case CMA_LISTEN:
855 if (cma_any_addr((struct sockaddr *) &id_priv->id.route.addr.src_addr)
856 && !id_priv->cma_dev)
857 cma_cancel_listens(id_priv);
858 break;
859 default:
860 break;
861 }
862 }
863
cma_release_port(struct rdma_id_private * id_priv)864 static void cma_release_port(struct rdma_id_private *id_priv)
865 {
866 struct rdma_bind_list *bind_list = id_priv->bind_list;
867
868 if (!bind_list)
869 return;
870
871 mutex_lock(&lock);
872 hlist_del(&id_priv->node);
873 if (hlist_empty(&bind_list->owners)) {
874 idr_remove(bind_list->ps, bind_list->port);
875 kfree(bind_list);
876 }
877 mutex_unlock(&lock);
878 }
879
cma_leave_mc_groups(struct rdma_id_private * id_priv)880 static void cma_leave_mc_groups(struct rdma_id_private *id_priv)
881 {
882 struct cma_multicast *mc;
883
884 while (!list_empty(&id_priv->mc_list)) {
885 mc = container_of(id_priv->mc_list.next,
886 struct cma_multicast, list);
887 list_del(&mc->list);
888 switch (rdma_port_get_link_layer(id_priv->cma_dev->device, id_priv->id.port_num)) {
889 case IB_LINK_LAYER_INFINIBAND:
890 ib_sa_free_multicast(mc->multicast.ib);
891 kfree(mc);
892 break;
893 case IB_LINK_LAYER_ETHERNET:
894 kref_put(&mc->mcref, release_mc);
895 break;
896 default:
897 break;
898 }
899 }
900 }
901
rdma_destroy_id(struct rdma_cm_id * id)902 void rdma_destroy_id(struct rdma_cm_id *id)
903 {
904 struct rdma_id_private *id_priv;
905 enum cma_state state;
906
907 id_priv = container_of(id, struct rdma_id_private, id);
908 state = cma_exch(id_priv, CMA_DESTROYING);
909 cma_cancel_operation(id_priv, state);
910
911 /*
912 * Wait for any active callback to finish. New callbacks will find
913 * the id_priv state set to destroying and abort.
914 */
915 mutex_lock(&id_priv->handler_mutex);
916 mutex_unlock(&id_priv->handler_mutex);
917
918 if (id_priv->cma_dev) {
919 switch (rdma_node_get_transport(id_priv->id.device->node_type)) {
920 case RDMA_TRANSPORT_IB:
921 if (id_priv->cm_id.ib && !IS_ERR(id_priv->cm_id.ib))
922 ib_destroy_cm_id(id_priv->cm_id.ib);
923 break;
924 case RDMA_TRANSPORT_IWARP:
925 if (id_priv->cm_id.iw && !IS_ERR(id_priv->cm_id.iw))
926 iw_destroy_cm_id(id_priv->cm_id.iw);
927 break;
928 default:
929 break;
930 }
931 cma_leave_mc_groups(id_priv);
932 cma_release_dev(id_priv);
933 }
934
935 cma_release_port(id_priv);
936 cma_deref_id(id_priv);
937 wait_for_completion(&id_priv->comp);
938
939 if (id_priv->internal_id)
940 cma_deref_id(id_priv->id.context);
941
942 kfree(id_priv->id.route.path_rec);
943 kfree(id_priv);
944 }
945 EXPORT_SYMBOL(rdma_destroy_id);
946
cma_rep_recv(struct rdma_id_private * id_priv)947 static int cma_rep_recv(struct rdma_id_private *id_priv)
948 {
949 int ret;
950
951 ret = cma_modify_qp_rtr(id_priv, NULL);
952 if (ret)
953 goto reject;
954
955 ret = cma_modify_qp_rts(id_priv, NULL);
956 if (ret)
957 goto reject;
958
959 ret = ib_send_cm_rtu(id_priv->cm_id.ib, NULL, 0);
960 if (ret)
961 goto reject;
962
963 return 0;
964 reject:
965 cma_modify_qp_err(id_priv);
966 ib_send_cm_rej(id_priv->cm_id.ib, IB_CM_REJ_CONSUMER_DEFINED,
967 NULL, 0, NULL, 0);
968 return ret;
969 }
970
cma_verify_rep(struct rdma_id_private * id_priv,void * data)971 static int cma_verify_rep(struct rdma_id_private *id_priv, void *data)
972 {
973 if (id_priv->id.ps == RDMA_PS_SDP &&
974 sdp_get_majv(((struct sdp_hah *) data)->sdp_version) !=
975 SDP_MAJ_VERSION)
976 return -EINVAL;
977
978 return 0;
979 }
980
cma_set_rep_event_data(struct rdma_cm_event * event,struct ib_cm_rep_event_param * rep_data,void * private_data)981 static void cma_set_rep_event_data(struct rdma_cm_event *event,
982 struct ib_cm_rep_event_param *rep_data,
983 void *private_data)
984 {
985 event->param.conn.private_data = private_data;
986 event->param.conn.private_data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
987 event->param.conn.responder_resources = rep_data->responder_resources;
988 event->param.conn.initiator_depth = rep_data->initiator_depth;
989 event->param.conn.flow_control = rep_data->flow_control;
990 event->param.conn.rnr_retry_count = rep_data->rnr_retry_count;
991 event->param.conn.srq = rep_data->srq;
992 event->param.conn.qp_num = rep_data->remote_qpn;
993 }
994
cma_ib_handler(struct ib_cm_id * cm_id,struct ib_cm_event * ib_event)995 static int cma_ib_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
996 {
997 struct rdma_id_private *id_priv = cm_id->context;
998 struct rdma_cm_event event;
999 int ret = 0;
1000
1001 if ((ib_event->event != IB_CM_TIMEWAIT_EXIT &&
1002 cma_disable_callback(id_priv, CMA_CONNECT)) ||
1003 (ib_event->event == IB_CM_TIMEWAIT_EXIT &&
1004 cma_disable_callback(id_priv, CMA_DISCONNECT)))
1005 return 0;
1006
1007 memset(&event, 0, sizeof event);
1008 switch (ib_event->event) {
1009 case IB_CM_REQ_ERROR:
1010 case IB_CM_REP_ERROR:
1011 event.event = RDMA_CM_EVENT_UNREACHABLE;
1012 event.status = -ETIMEDOUT;
1013 break;
1014 case IB_CM_REP_RECEIVED:
1015 event.status = cma_verify_rep(id_priv, ib_event->private_data);
1016 if (event.status)
1017 event.event = RDMA_CM_EVENT_CONNECT_ERROR;
1018 else if (id_priv->id.qp && id_priv->id.ps != RDMA_PS_SDP) {
1019 event.status = cma_rep_recv(id_priv);
1020 event.event = event.status ? RDMA_CM_EVENT_CONNECT_ERROR :
1021 RDMA_CM_EVENT_ESTABLISHED;
1022 } else
1023 event.event = RDMA_CM_EVENT_CONNECT_RESPONSE;
1024 cma_set_rep_event_data(&event, &ib_event->param.rep_rcvd,
1025 ib_event->private_data);
1026 break;
1027 case IB_CM_RTU_RECEIVED:
1028 case IB_CM_USER_ESTABLISHED:
1029 event.event = RDMA_CM_EVENT_ESTABLISHED;
1030 break;
1031 case IB_CM_DREQ_ERROR:
1032 event.status = -ETIMEDOUT; /* fall through */
1033 case IB_CM_DREQ_RECEIVED:
1034 case IB_CM_DREP_RECEIVED:
1035 if (!cma_comp_exch(id_priv, CMA_CONNECT, CMA_DISCONNECT))
1036 goto out;
1037 event.event = RDMA_CM_EVENT_DISCONNECTED;
1038 break;
1039 case IB_CM_TIMEWAIT_EXIT:
1040 event.event = RDMA_CM_EVENT_TIMEWAIT_EXIT;
1041 break;
1042 case IB_CM_MRA_RECEIVED:
1043 /* ignore event */
1044 goto out;
1045 case IB_CM_REJ_RECEIVED:
1046 cma_modify_qp_err(id_priv);
1047 event.status = ib_event->param.rej_rcvd.reason;
1048 event.event = RDMA_CM_EVENT_REJECTED;
1049 event.param.conn.private_data = ib_event->private_data;
1050 event.param.conn.private_data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
1051 break;
1052 default:
1053 printk(KERN_ERR "RDMA CMA: unexpected IB CM event: %d\n",
1054 ib_event->event);
1055 goto out;
1056 }
1057
1058 ret = id_priv->id.event_handler(&id_priv->id, &event);
1059 if (ret) {
1060 /* Destroy the CM ID by returning a non-zero value. */
1061 id_priv->cm_id.ib = NULL;
1062 cma_exch(id_priv, CMA_DESTROYING);
1063 mutex_unlock(&id_priv->handler_mutex);
1064 rdma_destroy_id(&id_priv->id);
1065 return ret;
1066 }
1067 out:
1068 mutex_unlock(&id_priv->handler_mutex);
1069 return ret;
1070 }
1071
cma_new_conn_id(struct rdma_cm_id * listen_id,struct ib_cm_event * ib_event)1072 static struct rdma_id_private *cma_new_conn_id(struct rdma_cm_id *listen_id,
1073 struct ib_cm_event *ib_event)
1074 {
1075 struct rdma_id_private *id_priv;
1076 struct rdma_cm_id *id;
1077 struct rdma_route *rt;
1078 union cma_ip_addr *src, *dst;
1079 __be16 port;
1080 u8 ip_ver;
1081 int ret;
1082
1083 if (cma_get_net_info(ib_event->private_data, listen_id->ps,
1084 &ip_ver, &port, &src, &dst))
1085 goto err;
1086
1087 id = rdma_create_id(listen_id->event_handler, listen_id->context,
1088 listen_id->ps);
1089 if (IS_ERR(id))
1090 goto err;
1091
1092 cma_save_net_info(&id->route.addr, &listen_id->route.addr,
1093 ip_ver, port, src, dst);
1094
1095 rt = &id->route;
1096 rt->num_paths = ib_event->param.req_rcvd.alternate_path ? 2 : 1;
1097 rt->path_rec = kmalloc(sizeof *rt->path_rec * rt->num_paths,
1098 GFP_KERNEL);
1099 if (!rt->path_rec)
1100 goto destroy_id;
1101
1102 rt->path_rec[0] = *ib_event->param.req_rcvd.primary_path;
1103 if (rt->num_paths == 2)
1104 rt->path_rec[1] = *ib_event->param.req_rcvd.alternate_path;
1105
1106 if (cma_any_addr((struct sockaddr *) &rt->addr.src_addr)) {
1107 rt->addr.dev_addr.dev_type = ARPHRD_INFINIBAND;
1108 rdma_addr_set_sgid(&rt->addr.dev_addr, &rt->path_rec[0].sgid);
1109 ib_addr_set_pkey(&rt->addr.dev_addr, rt->path_rec[0].pkey);
1110 } else {
1111 ret = rdma_translate_ip((struct sockaddr *) &rt->addr.src_addr,
1112 &rt->addr.dev_addr);
1113 if (ret)
1114 goto destroy_id;
1115 }
1116 rdma_addr_set_dgid(&rt->addr.dev_addr, &rt->path_rec[0].dgid);
1117
1118 id_priv = container_of(id, struct rdma_id_private, id);
1119 id_priv->state = CMA_CONNECT;
1120 return id_priv;
1121
1122 destroy_id:
1123 rdma_destroy_id(id);
1124 err:
1125 return NULL;
1126 }
1127
cma_new_udp_id(struct rdma_cm_id * listen_id,struct ib_cm_event * ib_event)1128 static struct rdma_id_private *cma_new_udp_id(struct rdma_cm_id *listen_id,
1129 struct ib_cm_event *ib_event)
1130 {
1131 struct rdma_id_private *id_priv;
1132 struct rdma_cm_id *id;
1133 union cma_ip_addr *src, *dst;
1134 __be16 port;
1135 u8 ip_ver;
1136 int ret;
1137
1138 id = rdma_create_id(listen_id->event_handler, listen_id->context,
1139 listen_id->ps);
1140 if (IS_ERR(id))
1141 return NULL;
1142
1143
1144 if (cma_get_net_info(ib_event->private_data, listen_id->ps,
1145 &ip_ver, &port, &src, &dst))
1146 goto err;
1147
1148 cma_save_net_info(&id->route.addr, &listen_id->route.addr,
1149 ip_ver, port, src, dst);
1150
1151 if (!cma_any_addr((struct sockaddr *) &id->route.addr.src_addr)) {
1152 ret = rdma_translate_ip((struct sockaddr *) &id->route.addr.src_addr,
1153 &id->route.addr.dev_addr);
1154 if (ret)
1155 goto err;
1156 }
1157
1158 id_priv = container_of(id, struct rdma_id_private, id);
1159 id_priv->state = CMA_CONNECT;
1160 return id_priv;
1161 err:
1162 rdma_destroy_id(id);
1163 return NULL;
1164 }
1165
cma_set_req_event_data(struct rdma_cm_event * event,struct ib_cm_req_event_param * req_data,void * private_data,int offset)1166 static void cma_set_req_event_data(struct rdma_cm_event *event,
1167 struct ib_cm_req_event_param *req_data,
1168 void *private_data, int offset)
1169 {
1170 event->param.conn.private_data = private_data + offset;
1171 event->param.conn.private_data_len = IB_CM_REQ_PRIVATE_DATA_SIZE - offset;
1172 event->param.conn.responder_resources = req_data->responder_resources;
1173 event->param.conn.initiator_depth = req_data->initiator_depth;
1174 event->param.conn.flow_control = req_data->flow_control;
1175 event->param.conn.retry_count = req_data->retry_count;
1176 event->param.conn.rnr_retry_count = req_data->rnr_retry_count;
1177 event->param.conn.srq = req_data->srq;
1178 event->param.conn.qp_num = req_data->remote_qpn;
1179 }
1180
cma_req_handler(struct ib_cm_id * cm_id,struct ib_cm_event * ib_event)1181 static int cma_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
1182 {
1183 struct rdma_id_private *listen_id, *conn_id;
1184 struct rdma_cm_event event;
1185 int offset, ret;
1186
1187 listen_id = cm_id->context;
1188 if (cma_disable_callback(listen_id, CMA_LISTEN))
1189 return -ECONNABORTED;
1190
1191 memset(&event, 0, sizeof event);
1192 offset = cma_user_data_offset(listen_id->id.ps);
1193 event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
1194 if (cma_is_ud_ps(listen_id->id.ps)) {
1195 conn_id = cma_new_udp_id(&listen_id->id, ib_event);
1196 event.param.ud.private_data = ib_event->private_data + offset;
1197 event.param.ud.private_data_len =
1198 IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE - offset;
1199 } else {
1200 conn_id = cma_new_conn_id(&listen_id->id, ib_event);
1201 cma_set_req_event_data(&event, &ib_event->param.req_rcvd,
1202 ib_event->private_data, offset);
1203 }
1204 if (!conn_id) {
1205 ret = -ENOMEM;
1206 goto out;
1207 }
1208
1209 mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
1210 ret = cma_acquire_dev(conn_id);
1211 if (ret)
1212 goto release_conn_id;
1213
1214 conn_id->cm_id.ib = cm_id;
1215 cm_id->context = conn_id;
1216 cm_id->cm_handler = cma_ib_handler;
1217
1218 /*
1219 * Protect against the user destroying conn_id from another thread
1220 * until we're done accessing it.
1221 */
1222 atomic_inc(&conn_id->refcount);
1223 ret = conn_id->id.event_handler(&conn_id->id, &event);
1224 if (!ret) {
1225 /*
1226 * Acquire mutex to prevent user executing rdma_destroy_id()
1227 * while we're accessing the cm_id.
1228 */
1229 mutex_lock(&lock);
1230 if (cma_comp(conn_id, CMA_CONNECT) &&
1231 !cma_is_ud_ps(conn_id->id.ps))
1232 ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0);
1233 mutex_unlock(&lock);
1234 mutex_unlock(&conn_id->handler_mutex);
1235 cma_deref_id(conn_id);
1236 goto out;
1237 }
1238 cma_deref_id(conn_id);
1239
1240 /* Destroy the CM ID by returning a non-zero value. */
1241 conn_id->cm_id.ib = NULL;
1242
1243 release_conn_id:
1244 cma_exch(conn_id, CMA_DESTROYING);
1245 mutex_unlock(&conn_id->handler_mutex);
1246 rdma_destroy_id(&conn_id->id);
1247
1248 out:
1249 mutex_unlock(&listen_id->handler_mutex);
1250 return ret;
1251 }
1252
cma_get_service_id(enum rdma_port_space ps,struct sockaddr * addr)1253 static __be64 cma_get_service_id(enum rdma_port_space ps, struct sockaddr *addr)
1254 {
1255 return cpu_to_be64(((u64)ps << 16) + be16_to_cpu(cma_port(addr)));
1256 }
1257
cma_set_compare_data(enum rdma_port_space ps,struct sockaddr * addr,struct ib_cm_compare_data * compare)1258 static void cma_set_compare_data(enum rdma_port_space ps, struct sockaddr *addr,
1259 struct ib_cm_compare_data *compare)
1260 {
1261 struct cma_hdr *cma_data, *cma_mask;
1262 struct sdp_hh *sdp_data, *sdp_mask;
1263 __be32 ip4_addr;
1264 struct in6_addr ip6_addr;
1265
1266 memset(compare, 0, sizeof *compare);
1267 cma_data = (void *) compare->data;
1268 cma_mask = (void *) compare->mask;
1269 sdp_data = (void *) compare->data;
1270 sdp_mask = (void *) compare->mask;
1271
1272 switch (addr->sa_family) {
1273 case AF_INET:
1274 ip4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
1275 if (ps == RDMA_PS_SDP) {
1276 sdp_set_ip_ver(sdp_data, 4);
1277 sdp_set_ip_ver(sdp_mask, 0xF);
1278 sdp_data->dst_addr.ip4.addr = ip4_addr;
1279 sdp_mask->dst_addr.ip4.addr = htonl(~0);
1280 } else {
1281 cma_set_ip_ver(cma_data, 4);
1282 cma_set_ip_ver(cma_mask, 0xF);
1283 cma_data->dst_addr.ip4.addr = ip4_addr;
1284 cma_mask->dst_addr.ip4.addr = htonl(~0);
1285 }
1286 break;
1287 case AF_INET6:
1288 ip6_addr = ((struct sockaddr_in6 *) addr)->sin6_addr;
1289 if (ps == RDMA_PS_SDP) {
1290 sdp_set_ip_ver(sdp_data, 6);
1291 sdp_set_ip_ver(sdp_mask, 0xF);
1292 sdp_data->dst_addr.ip6 = ip6_addr;
1293 memset(&sdp_mask->dst_addr.ip6, 0xFF,
1294 sizeof sdp_mask->dst_addr.ip6);
1295 } else {
1296 cma_set_ip_ver(cma_data, 6);
1297 cma_set_ip_ver(cma_mask, 0xF);
1298 cma_data->dst_addr.ip6 = ip6_addr;
1299 memset(&cma_mask->dst_addr.ip6, 0xFF,
1300 sizeof cma_mask->dst_addr.ip6);
1301 }
1302 break;
1303 default:
1304 break;
1305 }
1306 }
1307
cma_iw_handler(struct iw_cm_id * iw_id,struct iw_cm_event * iw_event)1308 static int cma_iw_handler(struct iw_cm_id *iw_id, struct iw_cm_event *iw_event)
1309 {
1310 struct rdma_id_private *id_priv = iw_id->context;
1311 struct rdma_cm_event event;
1312 struct sockaddr_in *sin;
1313 int ret = 0;
1314
1315 if (cma_disable_callback(id_priv, CMA_CONNECT))
1316 return 0;
1317
1318 memset(&event, 0, sizeof event);
1319 switch (iw_event->event) {
1320 case IW_CM_EVENT_CLOSE:
1321 event.event = RDMA_CM_EVENT_DISCONNECTED;
1322 break;
1323 case IW_CM_EVENT_CONNECT_REPLY:
1324 sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
1325 *sin = iw_event->local_addr;
1326 sin = (struct sockaddr_in *) &id_priv->id.route.addr.dst_addr;
1327 *sin = iw_event->remote_addr;
1328 switch (iw_event->status) {
1329 case 0:
1330 event.event = RDMA_CM_EVENT_ESTABLISHED;
1331 break;
1332 case -ECONNRESET:
1333 case -ECONNREFUSED:
1334 event.event = RDMA_CM_EVENT_REJECTED;
1335 break;
1336 case -ETIMEDOUT:
1337 event.event = RDMA_CM_EVENT_UNREACHABLE;
1338 break;
1339 default:
1340 event.event = RDMA_CM_EVENT_CONNECT_ERROR;
1341 break;
1342 }
1343 break;
1344 case IW_CM_EVENT_ESTABLISHED:
1345 event.event = RDMA_CM_EVENT_ESTABLISHED;
1346 break;
1347 default:
1348 BUG_ON(1);
1349 }
1350
1351 event.status = iw_event->status;
1352 event.param.conn.private_data = iw_event->private_data;
1353 event.param.conn.private_data_len = iw_event->private_data_len;
1354 ret = id_priv->id.event_handler(&id_priv->id, &event);
1355 if (ret) {
1356 /* Destroy the CM ID by returning a non-zero value. */
1357 id_priv->cm_id.iw = NULL;
1358 cma_exch(id_priv, CMA_DESTROYING);
1359 mutex_unlock(&id_priv->handler_mutex);
1360 rdma_destroy_id(&id_priv->id);
1361 return ret;
1362 }
1363
1364 mutex_unlock(&id_priv->handler_mutex);
1365 return ret;
1366 }
1367
iw_conn_req_handler(struct iw_cm_id * cm_id,struct iw_cm_event * iw_event)1368 static int iw_conn_req_handler(struct iw_cm_id *cm_id,
1369 struct iw_cm_event *iw_event)
1370 {
1371 struct rdma_cm_id *new_cm_id;
1372 struct rdma_id_private *listen_id, *conn_id;
1373 struct sockaddr_in *sin;
1374 struct net_device *dev = NULL;
1375 struct rdma_cm_event event;
1376 int ret;
1377 struct ib_device_attr attr;
1378
1379 listen_id = cm_id->context;
1380 if (cma_disable_callback(listen_id, CMA_LISTEN))
1381 return -ECONNABORTED;
1382
1383 /* Create a new RDMA id for the new IW CM ID */
1384 new_cm_id = rdma_create_id(listen_id->id.event_handler,
1385 listen_id->id.context,
1386 RDMA_PS_TCP);
1387 if (IS_ERR(new_cm_id)) {
1388 ret = -ENOMEM;
1389 goto out;
1390 }
1391 conn_id = container_of(new_cm_id, struct rdma_id_private, id);
1392 mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING);
1393 conn_id->state = CMA_CONNECT;
1394
1395 dev = ip_dev_find(&init_net, iw_event->local_addr.sin_addr.s_addr);
1396 if (!dev) {
1397 ret = -EADDRNOTAVAIL;
1398 mutex_unlock(&conn_id->handler_mutex);
1399 rdma_destroy_id(new_cm_id);
1400 goto out;
1401 }
1402 ret = rdma_copy_addr(&conn_id->id.route.addr.dev_addr, dev, NULL);
1403 if (ret) {
1404 mutex_unlock(&conn_id->handler_mutex);
1405 rdma_destroy_id(new_cm_id);
1406 goto out;
1407 }
1408
1409 ret = cma_acquire_dev(conn_id);
1410 if (ret) {
1411 mutex_unlock(&conn_id->handler_mutex);
1412 rdma_destroy_id(new_cm_id);
1413 goto out;
1414 }
1415
1416 conn_id->cm_id.iw = cm_id;
1417 cm_id->context = conn_id;
1418 cm_id->cm_handler = cma_iw_handler;
1419
1420 sin = (struct sockaddr_in *) &new_cm_id->route.addr.src_addr;
1421 *sin = iw_event->local_addr;
1422 sin = (struct sockaddr_in *) &new_cm_id->route.addr.dst_addr;
1423 *sin = iw_event->remote_addr;
1424
1425 ret = ib_query_device(conn_id->id.device, &attr);
1426 if (ret) {
1427 mutex_unlock(&conn_id->handler_mutex);
1428 rdma_destroy_id(new_cm_id);
1429 goto out;
1430 }
1431
1432 memset(&event, 0, sizeof event);
1433 event.event = RDMA_CM_EVENT_CONNECT_REQUEST;
1434 event.param.conn.private_data = iw_event->private_data;
1435 event.param.conn.private_data_len = iw_event->private_data_len;
1436 event.param.conn.initiator_depth = attr.max_qp_init_rd_atom;
1437 event.param.conn.responder_resources = attr.max_qp_rd_atom;
1438
1439 /*
1440 * Protect against the user destroying conn_id from another thread
1441 * until we're done accessing it.
1442 */
1443 atomic_inc(&conn_id->refcount);
1444 ret = conn_id->id.event_handler(&conn_id->id, &event);
1445 if (ret) {
1446 /* User wants to destroy the CM ID */
1447 conn_id->cm_id.iw = NULL;
1448 cma_exch(conn_id, CMA_DESTROYING);
1449 mutex_unlock(&conn_id->handler_mutex);
1450 cma_deref_id(conn_id);
1451 rdma_destroy_id(&conn_id->id);
1452 goto out;
1453 }
1454
1455 mutex_unlock(&conn_id->handler_mutex);
1456 cma_deref_id(conn_id);
1457
1458 out:
1459 if (dev)
1460 dev_put(dev);
1461 mutex_unlock(&listen_id->handler_mutex);
1462 return ret;
1463 }
1464
cma_ib_listen(struct rdma_id_private * id_priv)1465 static int cma_ib_listen(struct rdma_id_private *id_priv)
1466 {
1467 struct ib_cm_compare_data compare_data;
1468 struct sockaddr *addr;
1469 __be64 svc_id;
1470 int ret;
1471
1472 id_priv->cm_id.ib = ib_create_cm_id(id_priv->id.device, cma_req_handler,
1473 id_priv);
1474 if (IS_ERR(id_priv->cm_id.ib))
1475 return PTR_ERR(id_priv->cm_id.ib);
1476
1477 addr = (struct sockaddr *) &id_priv->id.route.addr.src_addr;
1478 svc_id = cma_get_service_id(id_priv->id.ps, addr);
1479 if (cma_any_addr(addr))
1480 ret = ib_cm_listen(id_priv->cm_id.ib, svc_id, 0, NULL);
1481 else {
1482 cma_set_compare_data(id_priv->id.ps, addr, &compare_data);
1483 ret = ib_cm_listen(id_priv->cm_id.ib, svc_id, 0, &compare_data);
1484 }
1485
1486 if (ret) {
1487 ib_destroy_cm_id(id_priv->cm_id.ib);
1488 id_priv->cm_id.ib = NULL;
1489 }
1490
1491 return ret;
1492 }
1493
cma_iw_listen(struct rdma_id_private * id_priv,int backlog)1494 static int cma_iw_listen(struct rdma_id_private *id_priv, int backlog)
1495 {
1496 int ret;
1497 struct sockaddr_in *sin;
1498
1499 id_priv->cm_id.iw = iw_create_cm_id(id_priv->id.device,
1500 iw_conn_req_handler,
1501 id_priv);
1502 if (IS_ERR(id_priv->cm_id.iw))
1503 return PTR_ERR(id_priv->cm_id.iw);
1504
1505 sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
1506 id_priv->cm_id.iw->local_addr = *sin;
1507
1508 ret = iw_cm_listen(id_priv->cm_id.iw, backlog);
1509
1510 if (ret) {
1511 iw_destroy_cm_id(id_priv->cm_id.iw);
1512 id_priv->cm_id.iw = NULL;
1513 }
1514
1515 return ret;
1516 }
1517
cma_listen_handler(struct rdma_cm_id * id,struct rdma_cm_event * event)1518 static int cma_listen_handler(struct rdma_cm_id *id,
1519 struct rdma_cm_event *event)
1520 {
1521 struct rdma_id_private *id_priv = id->context;
1522
1523 id->context = id_priv->id.context;
1524 id->event_handler = id_priv->id.event_handler;
1525 return id_priv->id.event_handler(id, event);
1526 }
1527
cma_listen_on_dev(struct rdma_id_private * id_priv,struct cma_device * cma_dev)1528 static void cma_listen_on_dev(struct rdma_id_private *id_priv,
1529 struct cma_device *cma_dev)
1530 {
1531 struct rdma_id_private *dev_id_priv;
1532 struct rdma_cm_id *id;
1533 int ret;
1534
1535 id = rdma_create_id(cma_listen_handler, id_priv, id_priv->id.ps);
1536 if (IS_ERR(id))
1537 return;
1538
1539 dev_id_priv = container_of(id, struct rdma_id_private, id);
1540
1541 dev_id_priv->state = CMA_ADDR_BOUND;
1542 memcpy(&id->route.addr.src_addr, &id_priv->id.route.addr.src_addr,
1543 ip_addr_size((struct sockaddr *) &id_priv->id.route.addr.src_addr));
1544
1545 cma_attach_to_dev(dev_id_priv, cma_dev);
1546 list_add_tail(&dev_id_priv->listen_list, &id_priv->listen_list);
1547 atomic_inc(&id_priv->refcount);
1548 dev_id_priv->internal_id = 1;
1549
1550 ret = rdma_listen(id, id_priv->backlog);
1551 if (ret)
1552 printk(KERN_WARNING "RDMA CMA: cma_listen_on_dev, error %d, "
1553 "listening on device %s\n", ret, cma_dev->device->name);
1554 }
1555
cma_listen_on_all(struct rdma_id_private * id_priv)1556 static void cma_listen_on_all(struct rdma_id_private *id_priv)
1557 {
1558 struct cma_device *cma_dev;
1559
1560 mutex_lock(&lock);
1561 list_add_tail(&id_priv->list, &listen_any_list);
1562 list_for_each_entry(cma_dev, &dev_list, list)
1563 cma_listen_on_dev(id_priv, cma_dev);
1564 mutex_unlock(&lock);
1565 }
1566
rdma_listen(struct rdma_cm_id * id,int backlog)1567 int rdma_listen(struct rdma_cm_id *id, int backlog)
1568 {
1569 struct rdma_id_private *id_priv;
1570 int ret;
1571
1572 id_priv = container_of(id, struct rdma_id_private, id);
1573 if (id_priv->state == CMA_IDLE) {
1574 ((struct sockaddr *) &id->route.addr.src_addr)->sa_family = AF_INET;
1575 ret = rdma_bind_addr(id, (struct sockaddr *) &id->route.addr.src_addr);
1576 if (ret)
1577 return ret;
1578 }
1579
1580 if (!cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_LISTEN))
1581 return -EINVAL;
1582
1583 id_priv->backlog = backlog;
1584 if (id->device) {
1585 switch (rdma_node_get_transport(id->device->node_type)) {
1586 case RDMA_TRANSPORT_IB:
1587 ret = cma_ib_listen(id_priv);
1588 if (ret)
1589 goto err;
1590 break;
1591 case RDMA_TRANSPORT_IWARP:
1592 ret = cma_iw_listen(id_priv, backlog);
1593 if (ret)
1594 goto err;
1595 break;
1596 default:
1597 ret = -ENOSYS;
1598 goto err;
1599 }
1600 } else
1601 cma_listen_on_all(id_priv);
1602
1603 return 0;
1604 err:
1605 id_priv->backlog = 0;
1606 cma_comp_exch(id_priv, CMA_LISTEN, CMA_ADDR_BOUND);
1607 return ret;
1608 }
1609 EXPORT_SYMBOL(rdma_listen);
1610
rdma_set_service_type(struct rdma_cm_id * id,int tos)1611 void rdma_set_service_type(struct rdma_cm_id *id, int tos)
1612 {
1613 struct rdma_id_private *id_priv;
1614
1615 id_priv = container_of(id, struct rdma_id_private, id);
1616 id_priv->tos = (u8) tos;
1617 }
1618 EXPORT_SYMBOL(rdma_set_service_type);
1619
cma_query_handler(int status,struct ib_sa_path_rec * path_rec,void * context)1620 static void cma_query_handler(int status, struct ib_sa_path_rec *path_rec,
1621 void *context)
1622 {
1623 struct cma_work *work = context;
1624 struct rdma_route *route;
1625
1626 route = &work->id->id.route;
1627
1628 if (!status) {
1629 route->num_paths = 1;
1630 *route->path_rec = *path_rec;
1631 } else {
1632 work->old_state = CMA_ROUTE_QUERY;
1633 work->new_state = CMA_ADDR_RESOLVED;
1634 work->event.event = RDMA_CM_EVENT_ROUTE_ERROR;
1635 work->event.status = status;
1636 }
1637
1638 queue_work(cma_wq, &work->work);
1639 }
1640
cma_query_ib_route(struct rdma_id_private * id_priv,int timeout_ms,struct cma_work * work)1641 static int cma_query_ib_route(struct rdma_id_private *id_priv, int timeout_ms,
1642 struct cma_work *work)
1643 {
1644 struct rdma_addr *addr = &id_priv->id.route.addr;
1645 struct ib_sa_path_rec path_rec;
1646 ib_sa_comp_mask comp_mask;
1647 struct sockaddr_in6 *sin6;
1648
1649 memset(&path_rec, 0, sizeof path_rec);
1650 rdma_addr_get_sgid(&addr->dev_addr, &path_rec.sgid);
1651 rdma_addr_get_dgid(&addr->dev_addr, &path_rec.dgid);
1652 path_rec.pkey = cpu_to_be16(ib_addr_get_pkey(&addr->dev_addr));
1653 path_rec.numb_path = 1;
1654 path_rec.reversible = 1;
1655 path_rec.service_id = cma_get_service_id(id_priv->id.ps,
1656 (struct sockaddr *) &addr->dst_addr);
1657
1658 comp_mask = IB_SA_PATH_REC_DGID | IB_SA_PATH_REC_SGID |
1659 IB_SA_PATH_REC_PKEY | IB_SA_PATH_REC_NUMB_PATH |
1660 IB_SA_PATH_REC_REVERSIBLE | IB_SA_PATH_REC_SERVICE_ID;
1661
1662 if (addr->src_addr.ss_family == AF_INET) {
1663 path_rec.qos_class = cpu_to_be16((u16) id_priv->tos);
1664 comp_mask |= IB_SA_PATH_REC_QOS_CLASS;
1665 } else {
1666 sin6 = (struct sockaddr_in6 *) &addr->src_addr;
1667 path_rec.traffic_class = (u8) (be32_to_cpu(sin6->sin6_flowinfo) >> 20);
1668 comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS;
1669 }
1670
1671 id_priv->query_id = ib_sa_path_rec_get(&sa_client, id_priv->id.device,
1672 id_priv->id.port_num, &path_rec,
1673 comp_mask, timeout_ms,
1674 GFP_KERNEL, cma_query_handler,
1675 work, &id_priv->query);
1676
1677 return (id_priv->query_id < 0) ? id_priv->query_id : 0;
1678 }
1679
cma_work_handler(struct work_struct * _work)1680 static void cma_work_handler(struct work_struct *_work)
1681 {
1682 struct cma_work *work = container_of(_work, struct cma_work, work);
1683 struct rdma_id_private *id_priv = work->id;
1684 int destroy = 0;
1685
1686 mutex_lock(&id_priv->handler_mutex);
1687 if (!cma_comp_exch(id_priv, work->old_state, work->new_state))
1688 goto out;
1689
1690 if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
1691 cma_exch(id_priv, CMA_DESTROYING);
1692 destroy = 1;
1693 }
1694 out:
1695 mutex_unlock(&id_priv->handler_mutex);
1696 cma_deref_id(id_priv);
1697 if (destroy)
1698 rdma_destroy_id(&id_priv->id);
1699 kfree(work);
1700 }
1701
cma_ndev_work_handler(struct work_struct * _work)1702 static void cma_ndev_work_handler(struct work_struct *_work)
1703 {
1704 struct cma_ndev_work *work = container_of(_work, struct cma_ndev_work, work);
1705 struct rdma_id_private *id_priv = work->id;
1706 int destroy = 0;
1707
1708 mutex_lock(&id_priv->handler_mutex);
1709 if (id_priv->state == CMA_DESTROYING ||
1710 id_priv->state == CMA_DEVICE_REMOVAL)
1711 goto out;
1712
1713 if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
1714 cma_exch(id_priv, CMA_DESTROYING);
1715 destroy = 1;
1716 }
1717
1718 out:
1719 mutex_unlock(&id_priv->handler_mutex);
1720 cma_deref_id(id_priv);
1721 if (destroy)
1722 rdma_destroy_id(&id_priv->id);
1723 kfree(work);
1724 }
1725
cma_resolve_ib_route(struct rdma_id_private * id_priv,int timeout_ms)1726 static int cma_resolve_ib_route(struct rdma_id_private *id_priv, int timeout_ms)
1727 {
1728 struct rdma_route *route = &id_priv->id.route;
1729 struct cma_work *work;
1730 int ret;
1731
1732 work = kzalloc(sizeof *work, GFP_KERNEL);
1733 if (!work)
1734 return -ENOMEM;
1735
1736 work->id = id_priv;
1737 INIT_WORK(&work->work, cma_work_handler);
1738 work->old_state = CMA_ROUTE_QUERY;
1739 work->new_state = CMA_ROUTE_RESOLVED;
1740 work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
1741
1742 route->path_rec = kmalloc(sizeof *route->path_rec, GFP_KERNEL);
1743 if (!route->path_rec) {
1744 ret = -ENOMEM;
1745 goto err1;
1746 }
1747
1748 ret = cma_query_ib_route(id_priv, timeout_ms, work);
1749 if (ret)
1750 goto err2;
1751
1752 return 0;
1753 err2:
1754 kfree(route->path_rec);
1755 route->path_rec = NULL;
1756 err1:
1757 kfree(work);
1758 return ret;
1759 }
1760
rdma_set_ib_paths(struct rdma_cm_id * id,struct ib_sa_path_rec * path_rec,int num_paths)1761 int rdma_set_ib_paths(struct rdma_cm_id *id,
1762 struct ib_sa_path_rec *path_rec, int num_paths)
1763 {
1764 struct rdma_id_private *id_priv;
1765 int ret;
1766
1767 id_priv = container_of(id, struct rdma_id_private, id);
1768 if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ROUTE_RESOLVED))
1769 return -EINVAL;
1770
1771 id->route.path_rec = kmemdup(path_rec, sizeof *path_rec * num_paths,
1772 GFP_KERNEL);
1773 if (!id->route.path_rec) {
1774 ret = -ENOMEM;
1775 goto err;
1776 }
1777
1778 id->route.num_paths = num_paths;
1779 return 0;
1780 err:
1781 cma_comp_exch(id_priv, CMA_ROUTE_RESOLVED, CMA_ADDR_RESOLVED);
1782 return ret;
1783 }
1784 EXPORT_SYMBOL(rdma_set_ib_paths);
1785
cma_resolve_iw_route(struct rdma_id_private * id_priv,int timeout_ms)1786 static int cma_resolve_iw_route(struct rdma_id_private *id_priv, int timeout_ms)
1787 {
1788 struct cma_work *work;
1789
1790 work = kzalloc(sizeof *work, GFP_KERNEL);
1791 if (!work)
1792 return -ENOMEM;
1793
1794 work->id = id_priv;
1795 INIT_WORK(&work->work, cma_work_handler);
1796 work->old_state = CMA_ROUTE_QUERY;
1797 work->new_state = CMA_ROUTE_RESOLVED;
1798 work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
1799 queue_work(cma_wq, &work->work);
1800 return 0;
1801 }
1802
cma_resolve_iboe_route(struct rdma_id_private * id_priv)1803 static int cma_resolve_iboe_route(struct rdma_id_private *id_priv)
1804 {
1805 struct rdma_route *route = &id_priv->id.route;
1806 struct rdma_addr *addr = &route->addr;
1807 struct cma_work *work;
1808 int ret;
1809 struct sockaddr_in *src_addr = (struct sockaddr_in *)&route->addr.src_addr;
1810 struct sockaddr_in *dst_addr = (struct sockaddr_in *)&route->addr.dst_addr;
1811 struct net_device *ndev = NULL;
1812 u16 vid;
1813
1814 if (src_addr->sin_family != dst_addr->sin_family)
1815 return -EINVAL;
1816
1817 work = kzalloc(sizeof *work, GFP_KERNEL);
1818 if (!work)
1819 return -ENOMEM;
1820
1821 work->id = id_priv;
1822 INIT_WORK(&work->work, cma_work_handler);
1823
1824 route->path_rec = kzalloc(sizeof *route->path_rec, GFP_KERNEL);
1825 if (!route->path_rec) {
1826 ret = -ENOMEM;
1827 goto err1;
1828 }
1829
1830 route->num_paths = 1;
1831
1832 if (addr->dev_addr.bound_dev_if)
1833 ndev = dev_get_by_index(&init_net, addr->dev_addr.bound_dev_if);
1834 if (!ndev) {
1835 ret = -ENODEV;
1836 goto err2;
1837 }
1838
1839 vid = rdma_vlan_dev_vlan_id(ndev);
1840
1841 iboe_mac_vlan_to_ll(&route->path_rec->sgid, addr->dev_addr.src_dev_addr, vid);
1842 iboe_mac_vlan_to_ll(&route->path_rec->dgid, addr->dev_addr.dst_dev_addr, vid);
1843
1844 route->path_rec->hop_limit = 1;
1845 route->path_rec->reversible = 1;
1846 route->path_rec->pkey = cpu_to_be16(0xffff);
1847 route->path_rec->mtu_selector = IB_SA_EQ;
1848 route->path_rec->sl = id_priv->tos >> 5;
1849
1850 route->path_rec->mtu = iboe_get_mtu(ndev->mtu);
1851 route->path_rec->rate_selector = IB_SA_EQ;
1852 route->path_rec->rate = iboe_get_rate(ndev);
1853 dev_put(ndev);
1854 route->path_rec->packet_life_time_selector = IB_SA_EQ;
1855 route->path_rec->packet_life_time = CMA_IBOE_PACKET_LIFETIME;
1856 if (!route->path_rec->mtu) {
1857 ret = -EINVAL;
1858 goto err2;
1859 }
1860
1861 work->old_state = CMA_ROUTE_QUERY;
1862 work->new_state = CMA_ROUTE_RESOLVED;
1863 work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
1864 work->event.status = 0;
1865
1866 queue_work(cma_wq, &work->work);
1867
1868 return 0;
1869
1870 err2:
1871 kfree(route->path_rec);
1872 route->path_rec = NULL;
1873 err1:
1874 kfree(work);
1875 return ret;
1876 }
1877
rdma_resolve_route(struct rdma_cm_id * id,int timeout_ms)1878 int rdma_resolve_route(struct rdma_cm_id *id, int timeout_ms)
1879 {
1880 struct rdma_id_private *id_priv;
1881 int ret;
1882
1883 id_priv = container_of(id, struct rdma_id_private, id);
1884 if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ROUTE_QUERY))
1885 return -EINVAL;
1886
1887 atomic_inc(&id_priv->refcount);
1888 switch (rdma_node_get_transport(id->device->node_type)) {
1889 case RDMA_TRANSPORT_IB:
1890 switch (rdma_port_get_link_layer(id->device, id->port_num)) {
1891 case IB_LINK_LAYER_INFINIBAND:
1892 ret = cma_resolve_ib_route(id_priv, timeout_ms);
1893 break;
1894 case IB_LINK_LAYER_ETHERNET:
1895 ret = cma_resolve_iboe_route(id_priv);
1896 break;
1897 default:
1898 ret = -ENOSYS;
1899 }
1900 break;
1901 case RDMA_TRANSPORT_IWARP:
1902 ret = cma_resolve_iw_route(id_priv, timeout_ms);
1903 break;
1904 default:
1905 ret = -ENOSYS;
1906 break;
1907 }
1908 if (ret)
1909 goto err;
1910
1911 return 0;
1912 err:
1913 cma_comp_exch(id_priv, CMA_ROUTE_QUERY, CMA_ADDR_RESOLVED);
1914 cma_deref_id(id_priv);
1915 return ret;
1916 }
1917 EXPORT_SYMBOL(rdma_resolve_route);
1918
cma_bind_loopback(struct rdma_id_private * id_priv)1919 static int cma_bind_loopback(struct rdma_id_private *id_priv)
1920 {
1921 struct cma_device *cma_dev;
1922 struct ib_port_attr port_attr;
1923 union ib_gid gid;
1924 u16 pkey;
1925 int ret;
1926 u8 p;
1927
1928 mutex_lock(&lock);
1929 if (list_empty(&dev_list)) {
1930 ret = -ENODEV;
1931 goto out;
1932 }
1933 list_for_each_entry(cma_dev, &dev_list, list)
1934 for (p = 1; p <= cma_dev->device->phys_port_cnt; ++p)
1935 if (!ib_query_port(cma_dev->device, p, &port_attr) &&
1936 port_attr.state == IB_PORT_ACTIVE)
1937 goto port_found;
1938
1939 p = 1;
1940 cma_dev = list_entry(dev_list.next, struct cma_device, list);
1941
1942 port_found:
1943 ret = ib_get_cached_gid(cma_dev->device, p, 0, &gid);
1944 if (ret)
1945 goto out;
1946
1947 ret = ib_get_cached_pkey(cma_dev->device, p, 0, &pkey);
1948 if (ret)
1949 goto out;
1950
1951 id_priv->id.route.addr.dev_addr.dev_type =
1952 (rdma_port_get_link_layer(cma_dev->device, p) == IB_LINK_LAYER_INFINIBAND) ?
1953 ARPHRD_INFINIBAND : ARPHRD_ETHER;
1954
1955 rdma_addr_set_sgid(&id_priv->id.route.addr.dev_addr, &gid);
1956 ib_addr_set_pkey(&id_priv->id.route.addr.dev_addr, pkey);
1957 id_priv->id.port_num = p;
1958 cma_attach_to_dev(id_priv, cma_dev);
1959 out:
1960 mutex_unlock(&lock);
1961 return ret;
1962 }
1963
addr_handler(int status,struct sockaddr * src_addr,struct rdma_dev_addr * dev_addr,void * context)1964 static void addr_handler(int status, struct sockaddr *src_addr,
1965 struct rdma_dev_addr *dev_addr, void *context)
1966 {
1967 struct rdma_id_private *id_priv = context;
1968 struct rdma_cm_event event;
1969
1970 memset(&event, 0, sizeof event);
1971 mutex_lock(&id_priv->handler_mutex);
1972 if (!cma_comp_exch(id_priv, CMA_ADDR_QUERY, CMA_ADDR_RESOLVED))
1973 goto out;
1974
1975 if (!status && !id_priv->cma_dev)
1976 status = cma_acquire_dev(id_priv);
1977
1978 if (status) {
1979 if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ADDR_BOUND))
1980 goto out;
1981 event.event = RDMA_CM_EVENT_ADDR_ERROR;
1982 event.status = status;
1983 } else {
1984 memcpy(&id_priv->id.route.addr.src_addr, src_addr,
1985 ip_addr_size(src_addr));
1986 event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
1987 }
1988
1989 if (id_priv->id.event_handler(&id_priv->id, &event)) {
1990 cma_exch(id_priv, CMA_DESTROYING);
1991 mutex_unlock(&id_priv->handler_mutex);
1992 cma_deref_id(id_priv);
1993 rdma_destroy_id(&id_priv->id);
1994 return;
1995 }
1996 out:
1997 mutex_unlock(&id_priv->handler_mutex);
1998 cma_deref_id(id_priv);
1999 }
2000
cma_resolve_loopback(struct rdma_id_private * id_priv)2001 static int cma_resolve_loopback(struct rdma_id_private *id_priv)
2002 {
2003 struct cma_work *work;
2004 struct sockaddr *src, *dst;
2005 union ib_gid gid;
2006 int ret;
2007
2008 work = kzalloc(sizeof *work, GFP_KERNEL);
2009 if (!work)
2010 return -ENOMEM;
2011
2012 if (!id_priv->cma_dev) {
2013 ret = cma_bind_loopback(id_priv);
2014 if (ret)
2015 goto err;
2016 }
2017
2018 rdma_addr_get_sgid(&id_priv->id.route.addr.dev_addr, &gid);
2019 rdma_addr_set_dgid(&id_priv->id.route.addr.dev_addr, &gid);
2020
2021 src = (struct sockaddr *) &id_priv->id.route.addr.src_addr;
2022 if (cma_zero_addr(src)) {
2023 dst = (struct sockaddr *) &id_priv->id.route.addr.dst_addr;
2024 if ((src->sa_family = dst->sa_family) == AF_INET) {
2025 ((struct sockaddr_in *) src)->sin_addr.s_addr =
2026 ((struct sockaddr_in *) dst)->sin_addr.s_addr;
2027 } else {
2028 ipv6_addr_copy(&((struct sockaddr_in6 *) src)->sin6_addr,
2029 &((struct sockaddr_in6 *) dst)->sin6_addr);
2030 }
2031 }
2032
2033 work->id = id_priv;
2034 INIT_WORK(&work->work, cma_work_handler);
2035 work->old_state = CMA_ADDR_QUERY;
2036 work->new_state = CMA_ADDR_RESOLVED;
2037 work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
2038 queue_work(cma_wq, &work->work);
2039 return 0;
2040 err:
2041 kfree(work);
2042 return ret;
2043 }
2044
cma_bind_addr(struct rdma_cm_id * id,struct sockaddr * src_addr,struct sockaddr * dst_addr)2045 static int cma_bind_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
2046 struct sockaddr *dst_addr)
2047 {
2048 if (!src_addr || !src_addr->sa_family) {
2049 src_addr = (struct sockaddr *) &id->route.addr.src_addr;
2050 if ((src_addr->sa_family = dst_addr->sa_family) == AF_INET6) {
2051 ((struct sockaddr_in6 *) src_addr)->sin6_scope_id =
2052 ((struct sockaddr_in6 *) dst_addr)->sin6_scope_id;
2053 }
2054 }
2055 return rdma_bind_addr(id, src_addr);
2056 }
2057
rdma_resolve_addr(struct rdma_cm_id * id,struct sockaddr * src_addr,struct sockaddr * dst_addr,int timeout_ms)2058 int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
2059 struct sockaddr *dst_addr, int timeout_ms)
2060 {
2061 struct rdma_id_private *id_priv;
2062 int ret;
2063
2064 id_priv = container_of(id, struct rdma_id_private, id);
2065 if (id_priv->state == CMA_IDLE) {
2066 ret = cma_bind_addr(id, src_addr, dst_addr);
2067 if (ret)
2068 return ret;
2069 }
2070
2071 if (!cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_ADDR_QUERY))
2072 return -EINVAL;
2073
2074 atomic_inc(&id_priv->refcount);
2075 memcpy(&id->route.addr.dst_addr, dst_addr, ip_addr_size(dst_addr));
2076 if (cma_any_addr(dst_addr))
2077 ret = cma_resolve_loopback(id_priv);
2078 else
2079 ret = rdma_resolve_ip(&addr_client, (struct sockaddr *) &id->route.addr.src_addr,
2080 dst_addr, &id->route.addr.dev_addr,
2081 timeout_ms, addr_handler, id_priv);
2082 if (ret)
2083 goto err;
2084
2085 return 0;
2086 err:
2087 cma_comp_exch(id_priv, CMA_ADDR_QUERY, CMA_ADDR_BOUND);
2088 cma_deref_id(id_priv);
2089 return ret;
2090 }
2091 EXPORT_SYMBOL(rdma_resolve_addr);
2092
cma_bind_port(struct rdma_bind_list * bind_list,struct rdma_id_private * id_priv)2093 static void cma_bind_port(struct rdma_bind_list *bind_list,
2094 struct rdma_id_private *id_priv)
2095 {
2096 struct sockaddr_in *sin;
2097
2098 sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
2099 sin->sin_port = htons(bind_list->port);
2100 id_priv->bind_list = bind_list;
2101 hlist_add_head(&id_priv->node, &bind_list->owners);
2102 }
2103
cma_alloc_port(struct idr * ps,struct rdma_id_private * id_priv,unsigned short snum)2104 static int cma_alloc_port(struct idr *ps, struct rdma_id_private *id_priv,
2105 unsigned short snum)
2106 {
2107 struct rdma_bind_list *bind_list;
2108 int port, ret;
2109
2110 bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL);
2111 if (!bind_list)
2112 return -ENOMEM;
2113
2114 do {
2115 ret = idr_get_new_above(ps, bind_list, snum, &port);
2116 } while ((ret == -EAGAIN) && idr_pre_get(ps, GFP_KERNEL));
2117
2118 if (ret)
2119 goto err1;
2120
2121 if (port != snum) {
2122 ret = -EADDRNOTAVAIL;
2123 goto err2;
2124 }
2125
2126 bind_list->ps = ps;
2127 bind_list->port = (unsigned short) port;
2128 cma_bind_port(bind_list, id_priv);
2129 return 0;
2130 err2:
2131 idr_remove(ps, port);
2132 err1:
2133 kfree(bind_list);
2134 return ret;
2135 }
2136
cma_alloc_any_port(struct idr * ps,struct rdma_id_private * id_priv)2137 static int cma_alloc_any_port(struct idr *ps, struct rdma_id_private *id_priv)
2138 {
2139 static unsigned int last_used_port;
2140 int low, high, remaining;
2141 unsigned int rover;
2142
2143 inet_get_local_port_range(&low, &high);
2144 remaining = (high - low) + 1;
2145 rover = net_random() % remaining + low;
2146 retry:
2147 if (last_used_port != rover &&
2148 !idr_find(ps, (unsigned short) rover)) {
2149 int ret = cma_alloc_port(ps, id_priv, rover);
2150 /*
2151 * Remember previously used port number in order to avoid
2152 * re-using same port immediately after it is closed.
2153 */
2154 if (!ret)
2155 last_used_port = rover;
2156 if (ret != -EADDRNOTAVAIL)
2157 return ret;
2158 }
2159 if (--remaining) {
2160 rover++;
2161 if ((rover < low) || (rover > high))
2162 rover = low;
2163 goto retry;
2164 }
2165 return -EADDRNOTAVAIL;
2166 }
2167
cma_use_port(struct idr * ps,struct rdma_id_private * id_priv)2168 static int cma_use_port(struct idr *ps, struct rdma_id_private *id_priv)
2169 {
2170 struct rdma_id_private *cur_id;
2171 struct sockaddr_in *sin, *cur_sin;
2172 struct rdma_bind_list *bind_list;
2173 struct hlist_node *node;
2174 unsigned short snum;
2175
2176 sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
2177 snum = ntohs(sin->sin_port);
2178 if (snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
2179 return -EACCES;
2180
2181 bind_list = idr_find(ps, snum);
2182 if (!bind_list)
2183 return cma_alloc_port(ps, id_priv, snum);
2184
2185 /*
2186 * We don't support binding to any address if anyone is bound to
2187 * a specific address on the same port.
2188 */
2189 if (cma_any_addr((struct sockaddr *) &id_priv->id.route.addr.src_addr))
2190 return -EADDRNOTAVAIL;
2191
2192 hlist_for_each_entry(cur_id, node, &bind_list->owners, node) {
2193 if (cma_any_addr((struct sockaddr *) &cur_id->id.route.addr.src_addr))
2194 return -EADDRNOTAVAIL;
2195
2196 cur_sin = (struct sockaddr_in *) &cur_id->id.route.addr.src_addr;
2197 if (sin->sin_addr.s_addr == cur_sin->sin_addr.s_addr)
2198 return -EADDRINUSE;
2199 }
2200
2201 cma_bind_port(bind_list, id_priv);
2202 return 0;
2203 }
2204
cma_get_port(struct rdma_id_private * id_priv)2205 static int cma_get_port(struct rdma_id_private *id_priv)
2206 {
2207 struct idr *ps;
2208 int ret;
2209
2210 switch (id_priv->id.ps) {
2211 case RDMA_PS_SDP:
2212 ps = &sdp_ps;
2213 break;
2214 case RDMA_PS_TCP:
2215 ps = &tcp_ps;
2216 break;
2217 case RDMA_PS_UDP:
2218 ps = &udp_ps;
2219 break;
2220 case RDMA_PS_IPOIB:
2221 ps = &ipoib_ps;
2222 break;
2223 default:
2224 return -EPROTONOSUPPORT;
2225 }
2226
2227 mutex_lock(&lock);
2228 if (cma_any_port((struct sockaddr *) &id_priv->id.route.addr.src_addr))
2229 ret = cma_alloc_any_port(ps, id_priv);
2230 else
2231 ret = cma_use_port(ps, id_priv);
2232 mutex_unlock(&lock);
2233
2234 return ret;
2235 }
2236
cma_check_linklocal(struct rdma_dev_addr * dev_addr,struct sockaddr * addr)2237 static int cma_check_linklocal(struct rdma_dev_addr *dev_addr,
2238 struct sockaddr *addr)
2239 {
2240 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2241 struct sockaddr_in6 *sin6;
2242
2243 if (addr->sa_family != AF_INET6)
2244 return 0;
2245
2246 sin6 = (struct sockaddr_in6 *) addr;
2247 if ((ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) &&
2248 !sin6->sin6_scope_id)
2249 return -EINVAL;
2250
2251 dev_addr->bound_dev_if = sin6->sin6_scope_id;
2252 #endif
2253 return 0;
2254 }
2255
rdma_bind_addr(struct rdma_cm_id * id,struct sockaddr * addr)2256 int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr)
2257 {
2258 struct rdma_id_private *id_priv;
2259 int ret;
2260
2261 if (addr->sa_family != AF_INET && addr->sa_family != AF_INET6)
2262 return -EAFNOSUPPORT;
2263
2264 id_priv = container_of(id, struct rdma_id_private, id);
2265 if (!cma_comp_exch(id_priv, CMA_IDLE, CMA_ADDR_BOUND))
2266 return -EINVAL;
2267
2268 ret = cma_check_linklocal(&id->route.addr.dev_addr, addr);
2269 if (ret)
2270 goto err1;
2271
2272 if (!cma_any_addr(addr)) {
2273 ret = rdma_translate_ip(addr, &id->route.addr.dev_addr);
2274 if (ret)
2275 goto err1;
2276
2277 ret = cma_acquire_dev(id_priv);
2278 if (ret)
2279 goto err1;
2280 }
2281
2282 memcpy(&id->route.addr.src_addr, addr, ip_addr_size(addr));
2283 ret = cma_get_port(id_priv);
2284 if (ret)
2285 goto err2;
2286
2287 return 0;
2288 err2:
2289 if (id_priv->cma_dev)
2290 cma_release_dev(id_priv);
2291 err1:
2292 cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_IDLE);
2293 return ret;
2294 }
2295 EXPORT_SYMBOL(rdma_bind_addr);
2296
cma_format_hdr(void * hdr,enum rdma_port_space ps,struct rdma_route * route)2297 static int cma_format_hdr(void *hdr, enum rdma_port_space ps,
2298 struct rdma_route *route)
2299 {
2300 struct cma_hdr *cma_hdr;
2301 struct sdp_hh *sdp_hdr;
2302
2303 if (route->addr.src_addr.ss_family == AF_INET) {
2304 struct sockaddr_in *src4, *dst4;
2305
2306 src4 = (struct sockaddr_in *) &route->addr.src_addr;
2307 dst4 = (struct sockaddr_in *) &route->addr.dst_addr;
2308
2309 switch (ps) {
2310 case RDMA_PS_SDP:
2311 sdp_hdr = hdr;
2312 if (sdp_get_majv(sdp_hdr->sdp_version) != SDP_MAJ_VERSION)
2313 return -EINVAL;
2314 sdp_set_ip_ver(sdp_hdr, 4);
2315 sdp_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
2316 sdp_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
2317 sdp_hdr->port = src4->sin_port;
2318 break;
2319 default:
2320 cma_hdr = hdr;
2321 cma_hdr->cma_version = CMA_VERSION;
2322 cma_set_ip_ver(cma_hdr, 4);
2323 cma_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
2324 cma_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
2325 cma_hdr->port = src4->sin_port;
2326 break;
2327 }
2328 } else {
2329 struct sockaddr_in6 *src6, *dst6;
2330
2331 src6 = (struct sockaddr_in6 *) &route->addr.src_addr;
2332 dst6 = (struct sockaddr_in6 *) &route->addr.dst_addr;
2333
2334 switch (ps) {
2335 case RDMA_PS_SDP:
2336 sdp_hdr = hdr;
2337 if (sdp_get_majv(sdp_hdr->sdp_version) != SDP_MAJ_VERSION)
2338 return -EINVAL;
2339 sdp_set_ip_ver(sdp_hdr, 6);
2340 sdp_hdr->src_addr.ip6 = src6->sin6_addr;
2341 sdp_hdr->dst_addr.ip6 = dst6->sin6_addr;
2342 sdp_hdr->port = src6->sin6_port;
2343 break;
2344 default:
2345 cma_hdr = hdr;
2346 cma_hdr->cma_version = CMA_VERSION;
2347 cma_set_ip_ver(cma_hdr, 6);
2348 cma_hdr->src_addr.ip6 = src6->sin6_addr;
2349 cma_hdr->dst_addr.ip6 = dst6->sin6_addr;
2350 cma_hdr->port = src6->sin6_port;
2351 break;
2352 }
2353 }
2354 return 0;
2355 }
2356
cma_sidr_rep_handler(struct ib_cm_id * cm_id,struct ib_cm_event * ib_event)2357 static int cma_sidr_rep_handler(struct ib_cm_id *cm_id,
2358 struct ib_cm_event *ib_event)
2359 {
2360 struct rdma_id_private *id_priv = cm_id->context;
2361 struct rdma_cm_event event;
2362 struct ib_cm_sidr_rep_event_param *rep = &ib_event->param.sidr_rep_rcvd;
2363 int ret = 0;
2364
2365 if (cma_disable_callback(id_priv, CMA_CONNECT))
2366 return 0;
2367
2368 memset(&event, 0, sizeof event);
2369 switch (ib_event->event) {
2370 case IB_CM_SIDR_REQ_ERROR:
2371 event.event = RDMA_CM_EVENT_UNREACHABLE;
2372 event.status = -ETIMEDOUT;
2373 break;
2374 case IB_CM_SIDR_REP_RECEIVED:
2375 event.param.ud.private_data = ib_event->private_data;
2376 event.param.ud.private_data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
2377 if (rep->status != IB_SIDR_SUCCESS) {
2378 event.event = RDMA_CM_EVENT_UNREACHABLE;
2379 event.status = ib_event->param.sidr_rep_rcvd.status;
2380 break;
2381 }
2382 ret = cma_set_qkey(id_priv);
2383 if (ret) {
2384 event.event = RDMA_CM_EVENT_ADDR_ERROR;
2385 event.status = -EINVAL;
2386 break;
2387 }
2388 if (id_priv->qkey != rep->qkey) {
2389 event.event = RDMA_CM_EVENT_UNREACHABLE;
2390 event.status = -EINVAL;
2391 break;
2392 }
2393 ib_init_ah_from_path(id_priv->id.device, id_priv->id.port_num,
2394 id_priv->id.route.path_rec,
2395 &event.param.ud.ah_attr);
2396 event.param.ud.qp_num = rep->qpn;
2397 event.param.ud.qkey = rep->qkey;
2398 event.event = RDMA_CM_EVENT_ESTABLISHED;
2399 event.status = 0;
2400 break;
2401 default:
2402 printk(KERN_ERR "RDMA CMA: unexpected IB CM event: %d\n",
2403 ib_event->event);
2404 goto out;
2405 }
2406
2407 ret = id_priv->id.event_handler(&id_priv->id, &event);
2408 if (ret) {
2409 /* Destroy the CM ID by returning a non-zero value. */
2410 id_priv->cm_id.ib = NULL;
2411 cma_exch(id_priv, CMA_DESTROYING);
2412 mutex_unlock(&id_priv->handler_mutex);
2413 rdma_destroy_id(&id_priv->id);
2414 return ret;
2415 }
2416 out:
2417 mutex_unlock(&id_priv->handler_mutex);
2418 return ret;
2419 }
2420
cma_resolve_ib_udp(struct rdma_id_private * id_priv,struct rdma_conn_param * conn_param)2421 static int cma_resolve_ib_udp(struct rdma_id_private *id_priv,
2422 struct rdma_conn_param *conn_param)
2423 {
2424 struct ib_cm_sidr_req_param req;
2425 struct rdma_route *route;
2426 int ret;
2427
2428 req.private_data_len = sizeof(struct cma_hdr) +
2429 conn_param->private_data_len;
2430 req.private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
2431 if (!req.private_data)
2432 return -ENOMEM;
2433
2434 if (conn_param->private_data && conn_param->private_data_len)
2435 memcpy((void *) req.private_data + sizeof(struct cma_hdr),
2436 conn_param->private_data, conn_param->private_data_len);
2437
2438 route = &id_priv->id.route;
2439 ret = cma_format_hdr((void *) req.private_data, id_priv->id.ps, route);
2440 if (ret)
2441 goto out;
2442
2443 id_priv->cm_id.ib = ib_create_cm_id(id_priv->id.device,
2444 cma_sidr_rep_handler, id_priv);
2445 if (IS_ERR(id_priv->cm_id.ib)) {
2446 ret = PTR_ERR(id_priv->cm_id.ib);
2447 goto out;
2448 }
2449
2450 req.path = route->path_rec;
2451 req.service_id = cma_get_service_id(id_priv->id.ps,
2452 (struct sockaddr *) &route->addr.dst_addr);
2453 req.timeout_ms = 1 << (CMA_CM_RESPONSE_TIMEOUT - 8);
2454 req.max_cm_retries = CMA_MAX_CM_RETRIES;
2455
2456 ret = ib_send_cm_sidr_req(id_priv->cm_id.ib, &req);
2457 if (ret) {
2458 ib_destroy_cm_id(id_priv->cm_id.ib);
2459 id_priv->cm_id.ib = NULL;
2460 }
2461 out:
2462 kfree(req.private_data);
2463 return ret;
2464 }
2465
cma_connect_ib(struct rdma_id_private * id_priv,struct rdma_conn_param * conn_param)2466 static int cma_connect_ib(struct rdma_id_private *id_priv,
2467 struct rdma_conn_param *conn_param)
2468 {
2469 struct ib_cm_req_param req;
2470 struct rdma_route *route;
2471 void *private_data;
2472 int offset, ret;
2473
2474 memset(&req, 0, sizeof req);
2475 offset = cma_user_data_offset(id_priv->id.ps);
2476 req.private_data_len = offset + conn_param->private_data_len;
2477 private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
2478 if (!private_data)
2479 return -ENOMEM;
2480
2481 if (conn_param->private_data && conn_param->private_data_len)
2482 memcpy(private_data + offset, conn_param->private_data,
2483 conn_param->private_data_len);
2484
2485 id_priv->cm_id.ib = ib_create_cm_id(id_priv->id.device, cma_ib_handler,
2486 id_priv);
2487 if (IS_ERR(id_priv->cm_id.ib)) {
2488 ret = PTR_ERR(id_priv->cm_id.ib);
2489 goto out;
2490 }
2491
2492 route = &id_priv->id.route;
2493 ret = cma_format_hdr(private_data, id_priv->id.ps, route);
2494 if (ret)
2495 goto out;
2496 req.private_data = private_data;
2497
2498 req.primary_path = &route->path_rec[0];
2499 if (route->num_paths == 2)
2500 req.alternate_path = &route->path_rec[1];
2501
2502 req.service_id = cma_get_service_id(id_priv->id.ps,
2503 (struct sockaddr *) &route->addr.dst_addr);
2504 req.qp_num = id_priv->qp_num;
2505 req.qp_type = IB_QPT_RC;
2506 req.starting_psn = id_priv->seq_num;
2507 req.responder_resources = conn_param->responder_resources;
2508 req.initiator_depth = conn_param->initiator_depth;
2509 req.flow_control = conn_param->flow_control;
2510 req.retry_count = conn_param->retry_count;
2511 req.rnr_retry_count = conn_param->rnr_retry_count;
2512 req.remote_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
2513 req.local_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
2514 req.max_cm_retries = CMA_MAX_CM_RETRIES;
2515 req.srq = id_priv->srq ? 1 : 0;
2516
2517 ret = ib_send_cm_req(id_priv->cm_id.ib, &req);
2518 out:
2519 if (ret && !IS_ERR(id_priv->cm_id.ib)) {
2520 ib_destroy_cm_id(id_priv->cm_id.ib);
2521 id_priv->cm_id.ib = NULL;
2522 }
2523
2524 kfree(private_data);
2525 return ret;
2526 }
2527
cma_connect_iw(struct rdma_id_private * id_priv,struct rdma_conn_param * conn_param)2528 static int cma_connect_iw(struct rdma_id_private *id_priv,
2529 struct rdma_conn_param *conn_param)
2530 {
2531 struct iw_cm_id *cm_id;
2532 struct sockaddr_in* sin;
2533 int ret;
2534 struct iw_cm_conn_param iw_param;
2535
2536 cm_id = iw_create_cm_id(id_priv->id.device, cma_iw_handler, id_priv);
2537 if (IS_ERR(cm_id)) {
2538 ret = PTR_ERR(cm_id);
2539 goto out;
2540 }
2541
2542 id_priv->cm_id.iw = cm_id;
2543
2544 sin = (struct sockaddr_in*) &id_priv->id.route.addr.src_addr;
2545 cm_id->local_addr = *sin;
2546
2547 sin = (struct sockaddr_in*) &id_priv->id.route.addr.dst_addr;
2548 cm_id->remote_addr = *sin;
2549
2550 ret = cma_modify_qp_rtr(id_priv, conn_param);
2551 if (ret)
2552 goto out;
2553
2554 iw_param.ord = conn_param->initiator_depth;
2555 iw_param.ird = conn_param->responder_resources;
2556 iw_param.private_data = conn_param->private_data;
2557 iw_param.private_data_len = conn_param->private_data_len;
2558 if (id_priv->id.qp)
2559 iw_param.qpn = id_priv->qp_num;
2560 else
2561 iw_param.qpn = conn_param->qp_num;
2562 ret = iw_cm_connect(cm_id, &iw_param);
2563 out:
2564 if (ret && !IS_ERR(cm_id)) {
2565 iw_destroy_cm_id(cm_id);
2566 id_priv->cm_id.iw = NULL;
2567 }
2568 return ret;
2569 }
2570
rdma_connect(struct rdma_cm_id * id,struct rdma_conn_param * conn_param)2571 int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
2572 {
2573 struct rdma_id_private *id_priv;
2574 int ret;
2575
2576 id_priv = container_of(id, struct rdma_id_private, id);
2577 if (!cma_comp_exch(id_priv, CMA_ROUTE_RESOLVED, CMA_CONNECT))
2578 return -EINVAL;
2579
2580 if (!id->qp) {
2581 id_priv->qp_num = conn_param->qp_num;
2582 id_priv->srq = conn_param->srq;
2583 }
2584
2585 switch (rdma_node_get_transport(id->device->node_type)) {
2586 case RDMA_TRANSPORT_IB:
2587 if (cma_is_ud_ps(id->ps))
2588 ret = cma_resolve_ib_udp(id_priv, conn_param);
2589 else
2590 ret = cma_connect_ib(id_priv, conn_param);
2591 break;
2592 case RDMA_TRANSPORT_IWARP:
2593 ret = cma_connect_iw(id_priv, conn_param);
2594 break;
2595 default:
2596 ret = -ENOSYS;
2597 break;
2598 }
2599 if (ret)
2600 goto err;
2601
2602 return 0;
2603 err:
2604 cma_comp_exch(id_priv, CMA_CONNECT, CMA_ROUTE_RESOLVED);
2605 return ret;
2606 }
2607 EXPORT_SYMBOL(rdma_connect);
2608
cma_accept_ib(struct rdma_id_private * id_priv,struct rdma_conn_param * conn_param)2609 static int cma_accept_ib(struct rdma_id_private *id_priv,
2610 struct rdma_conn_param *conn_param)
2611 {
2612 struct ib_cm_rep_param rep;
2613 int ret;
2614
2615 ret = cma_modify_qp_rtr(id_priv, conn_param);
2616 if (ret)
2617 goto out;
2618
2619 ret = cma_modify_qp_rts(id_priv, conn_param);
2620 if (ret)
2621 goto out;
2622
2623 memset(&rep, 0, sizeof rep);
2624 rep.qp_num = id_priv->qp_num;
2625 rep.starting_psn = id_priv->seq_num;
2626 rep.private_data = conn_param->private_data;
2627 rep.private_data_len = conn_param->private_data_len;
2628 rep.responder_resources = conn_param->responder_resources;
2629 rep.initiator_depth = conn_param->initiator_depth;
2630 rep.failover_accepted = 0;
2631 rep.flow_control = conn_param->flow_control;
2632 rep.rnr_retry_count = conn_param->rnr_retry_count;
2633 rep.srq = id_priv->srq ? 1 : 0;
2634
2635 ret = ib_send_cm_rep(id_priv->cm_id.ib, &rep);
2636 out:
2637 return ret;
2638 }
2639
cma_accept_iw(struct rdma_id_private * id_priv,struct rdma_conn_param * conn_param)2640 static int cma_accept_iw(struct rdma_id_private *id_priv,
2641 struct rdma_conn_param *conn_param)
2642 {
2643 struct iw_cm_conn_param iw_param;
2644 int ret;
2645
2646 ret = cma_modify_qp_rtr(id_priv, conn_param);
2647 if (ret)
2648 return ret;
2649
2650 iw_param.ord = conn_param->initiator_depth;
2651 iw_param.ird = conn_param->responder_resources;
2652 iw_param.private_data = conn_param->private_data;
2653 iw_param.private_data_len = conn_param->private_data_len;
2654 if (id_priv->id.qp) {
2655 iw_param.qpn = id_priv->qp_num;
2656 } else
2657 iw_param.qpn = conn_param->qp_num;
2658
2659 return iw_cm_accept(id_priv->cm_id.iw, &iw_param);
2660 }
2661
cma_send_sidr_rep(struct rdma_id_private * id_priv,enum ib_cm_sidr_status status,const void * private_data,int private_data_len)2662 static int cma_send_sidr_rep(struct rdma_id_private *id_priv,
2663 enum ib_cm_sidr_status status,
2664 const void *private_data, int private_data_len)
2665 {
2666 struct ib_cm_sidr_rep_param rep;
2667 int ret;
2668
2669 memset(&rep, 0, sizeof rep);
2670 rep.status = status;
2671 if (status == IB_SIDR_SUCCESS) {
2672 ret = cma_set_qkey(id_priv);
2673 if (ret)
2674 return ret;
2675 rep.qp_num = id_priv->qp_num;
2676 rep.qkey = id_priv->qkey;
2677 }
2678 rep.private_data = private_data;
2679 rep.private_data_len = private_data_len;
2680
2681 return ib_send_cm_sidr_rep(id_priv->cm_id.ib, &rep);
2682 }
2683
rdma_accept(struct rdma_cm_id * id,struct rdma_conn_param * conn_param)2684 int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
2685 {
2686 struct rdma_id_private *id_priv;
2687 int ret;
2688
2689 id_priv = container_of(id, struct rdma_id_private, id);
2690 if (!cma_comp(id_priv, CMA_CONNECT))
2691 return -EINVAL;
2692
2693 if (!id->qp && conn_param) {
2694 id_priv->qp_num = conn_param->qp_num;
2695 id_priv->srq = conn_param->srq;
2696 }
2697
2698 switch (rdma_node_get_transport(id->device->node_type)) {
2699 case RDMA_TRANSPORT_IB:
2700 if (cma_is_ud_ps(id->ps))
2701 ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS,
2702 conn_param->private_data,
2703 conn_param->private_data_len);
2704 else if (conn_param)
2705 ret = cma_accept_ib(id_priv, conn_param);
2706 else
2707 ret = cma_rep_recv(id_priv);
2708 break;
2709 case RDMA_TRANSPORT_IWARP:
2710 ret = cma_accept_iw(id_priv, conn_param);
2711 break;
2712 default:
2713 ret = -ENOSYS;
2714 break;
2715 }
2716
2717 if (ret)
2718 goto reject;
2719
2720 return 0;
2721 reject:
2722 cma_modify_qp_err(id_priv);
2723 rdma_reject(id, NULL, 0);
2724 return ret;
2725 }
2726 EXPORT_SYMBOL(rdma_accept);
2727
rdma_notify(struct rdma_cm_id * id,enum ib_event_type event)2728 int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event)
2729 {
2730 struct rdma_id_private *id_priv;
2731 int ret;
2732
2733 id_priv = container_of(id, struct rdma_id_private, id);
2734 if (!cma_has_cm_dev(id_priv))
2735 return -EINVAL;
2736
2737 switch (id->device->node_type) {
2738 case RDMA_NODE_IB_CA:
2739 ret = ib_cm_notify(id_priv->cm_id.ib, event);
2740 break;
2741 default:
2742 ret = 0;
2743 break;
2744 }
2745 return ret;
2746 }
2747 EXPORT_SYMBOL(rdma_notify);
2748
rdma_reject(struct rdma_cm_id * id,const void * private_data,u8 private_data_len)2749 int rdma_reject(struct rdma_cm_id *id, const void *private_data,
2750 u8 private_data_len)
2751 {
2752 struct rdma_id_private *id_priv;
2753 int ret;
2754
2755 id_priv = container_of(id, struct rdma_id_private, id);
2756 if (!cma_has_cm_dev(id_priv))
2757 return -EINVAL;
2758
2759 switch (rdma_node_get_transport(id->device->node_type)) {
2760 case RDMA_TRANSPORT_IB:
2761 if (cma_is_ud_ps(id->ps))
2762 ret = cma_send_sidr_rep(id_priv, IB_SIDR_REJECT,
2763 private_data, private_data_len);
2764 else
2765 ret = ib_send_cm_rej(id_priv->cm_id.ib,
2766 IB_CM_REJ_CONSUMER_DEFINED, NULL,
2767 0, private_data, private_data_len);
2768 break;
2769 case RDMA_TRANSPORT_IWARP:
2770 ret = iw_cm_reject(id_priv->cm_id.iw,
2771 private_data, private_data_len);
2772 break;
2773 default:
2774 ret = -ENOSYS;
2775 break;
2776 }
2777 return ret;
2778 }
2779 EXPORT_SYMBOL(rdma_reject);
2780
rdma_disconnect(struct rdma_cm_id * id)2781 int rdma_disconnect(struct rdma_cm_id *id)
2782 {
2783 struct rdma_id_private *id_priv;
2784 int ret;
2785
2786 id_priv = container_of(id, struct rdma_id_private, id);
2787 if (!cma_has_cm_dev(id_priv))
2788 return -EINVAL;
2789
2790 switch (rdma_node_get_transport(id->device->node_type)) {
2791 case RDMA_TRANSPORT_IB:
2792 ret = cma_modify_qp_err(id_priv);
2793 if (ret)
2794 goto out;
2795 /* Initiate or respond to a disconnect. */
2796 if (ib_send_cm_dreq(id_priv->cm_id.ib, NULL, 0))
2797 ib_send_cm_drep(id_priv->cm_id.ib, NULL, 0);
2798 break;
2799 case RDMA_TRANSPORT_IWARP:
2800 ret = iw_cm_disconnect(id_priv->cm_id.iw, 0);
2801 break;
2802 default:
2803 ret = -EINVAL;
2804 break;
2805 }
2806 out:
2807 return ret;
2808 }
2809 EXPORT_SYMBOL(rdma_disconnect);
2810
cma_ib_mc_handler(int status,struct ib_sa_multicast * multicast)2811 static int cma_ib_mc_handler(int status, struct ib_sa_multicast *multicast)
2812 {
2813 struct rdma_id_private *id_priv;
2814 struct cma_multicast *mc = multicast->context;
2815 struct rdma_cm_event event;
2816 int ret;
2817
2818 id_priv = mc->id_priv;
2819 if (cma_disable_callback(id_priv, CMA_ADDR_BOUND) &&
2820 cma_disable_callback(id_priv, CMA_ADDR_RESOLVED))
2821 return 0;
2822
2823 mutex_lock(&id_priv->qp_mutex);
2824 if (!status && id_priv->id.qp)
2825 status = ib_attach_mcast(id_priv->id.qp, &multicast->rec.mgid,
2826 multicast->rec.mlid);
2827 mutex_unlock(&id_priv->qp_mutex);
2828
2829 memset(&event, 0, sizeof event);
2830 event.status = status;
2831 event.param.ud.private_data = mc->context;
2832 if (!status) {
2833 event.event = RDMA_CM_EVENT_MULTICAST_JOIN;
2834 ib_init_ah_from_mcmember(id_priv->id.device,
2835 id_priv->id.port_num, &multicast->rec,
2836 &event.param.ud.ah_attr);
2837 event.param.ud.qp_num = 0xFFFFFF;
2838 event.param.ud.qkey = be32_to_cpu(multicast->rec.qkey);
2839 } else
2840 event.event = RDMA_CM_EVENT_MULTICAST_ERROR;
2841
2842 ret = id_priv->id.event_handler(&id_priv->id, &event);
2843 if (ret) {
2844 cma_exch(id_priv, CMA_DESTROYING);
2845 mutex_unlock(&id_priv->handler_mutex);
2846 rdma_destroy_id(&id_priv->id);
2847 return 0;
2848 }
2849
2850 mutex_unlock(&id_priv->handler_mutex);
2851 return 0;
2852 }
2853
cma_set_mgid(struct rdma_id_private * id_priv,struct sockaddr * addr,union ib_gid * mgid)2854 static void cma_set_mgid(struct rdma_id_private *id_priv,
2855 struct sockaddr *addr, union ib_gid *mgid)
2856 {
2857 unsigned char mc_map[MAX_ADDR_LEN];
2858 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
2859 struct sockaddr_in *sin = (struct sockaddr_in *) addr;
2860 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) addr;
2861
2862 if (cma_any_addr(addr)) {
2863 memset(mgid, 0, sizeof *mgid);
2864 } else if ((addr->sa_family == AF_INET6) &&
2865 ((be32_to_cpu(sin6->sin6_addr.s6_addr32[0]) & 0xFFF0FFFF) ==
2866 0xFF10A01B)) {
2867 /* IPv6 address is an SA assigned MGID. */
2868 memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
2869 } else if ((addr->sa_family == AF_INET6)) {
2870 ipv6_ib_mc_map(&sin6->sin6_addr, dev_addr->broadcast, mc_map);
2871 if (id_priv->id.ps == RDMA_PS_UDP)
2872 mc_map[7] = 0x01; /* Use RDMA CM signature */
2873 *mgid = *(union ib_gid *) (mc_map + 4);
2874 } else {
2875 ip_ib_mc_map(sin->sin_addr.s_addr, dev_addr->broadcast, mc_map);
2876 if (id_priv->id.ps == RDMA_PS_UDP)
2877 mc_map[7] = 0x01; /* Use RDMA CM signature */
2878 *mgid = *(union ib_gid *) (mc_map + 4);
2879 }
2880 }
2881
cma_join_ib_multicast(struct rdma_id_private * id_priv,struct cma_multicast * mc)2882 static int cma_join_ib_multicast(struct rdma_id_private *id_priv,
2883 struct cma_multicast *mc)
2884 {
2885 struct ib_sa_mcmember_rec rec;
2886 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
2887 ib_sa_comp_mask comp_mask;
2888 int ret;
2889
2890 ib_addr_get_mgid(dev_addr, &rec.mgid);
2891 ret = ib_sa_get_mcmember_rec(id_priv->id.device, id_priv->id.port_num,
2892 &rec.mgid, &rec);
2893 if (ret)
2894 return ret;
2895
2896 cma_set_mgid(id_priv, (struct sockaddr *) &mc->addr, &rec.mgid);
2897 if (id_priv->id.ps == RDMA_PS_UDP)
2898 rec.qkey = cpu_to_be32(RDMA_UDP_QKEY);
2899 rdma_addr_get_sgid(dev_addr, &rec.port_gid);
2900 rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
2901 rec.join_state = 1;
2902
2903 comp_mask = IB_SA_MCMEMBER_REC_MGID | IB_SA_MCMEMBER_REC_PORT_GID |
2904 IB_SA_MCMEMBER_REC_PKEY | IB_SA_MCMEMBER_REC_JOIN_STATE |
2905 IB_SA_MCMEMBER_REC_QKEY | IB_SA_MCMEMBER_REC_SL |
2906 IB_SA_MCMEMBER_REC_FLOW_LABEL |
2907 IB_SA_MCMEMBER_REC_TRAFFIC_CLASS;
2908
2909 if (id_priv->id.ps == RDMA_PS_IPOIB)
2910 comp_mask |= IB_SA_MCMEMBER_REC_RATE |
2911 IB_SA_MCMEMBER_REC_RATE_SELECTOR;
2912
2913 mc->multicast.ib = ib_sa_join_multicast(&sa_client, id_priv->id.device,
2914 id_priv->id.port_num, &rec,
2915 comp_mask, GFP_KERNEL,
2916 cma_ib_mc_handler, mc);
2917 if (IS_ERR(mc->multicast.ib))
2918 return PTR_ERR(mc->multicast.ib);
2919
2920 return 0;
2921 }
2922
iboe_mcast_work_handler(struct work_struct * work)2923 static void iboe_mcast_work_handler(struct work_struct *work)
2924 {
2925 struct iboe_mcast_work *mw = container_of(work, struct iboe_mcast_work, work);
2926 struct cma_multicast *mc = mw->mc;
2927 struct ib_sa_multicast *m = mc->multicast.ib;
2928
2929 mc->multicast.ib->context = mc;
2930 cma_ib_mc_handler(0, m);
2931 kref_put(&mc->mcref, release_mc);
2932 kfree(mw);
2933 }
2934
cma_iboe_set_mgid(struct sockaddr * addr,union ib_gid * mgid)2935 static void cma_iboe_set_mgid(struct sockaddr *addr, union ib_gid *mgid)
2936 {
2937 struct sockaddr_in *sin = (struct sockaddr_in *)addr;
2938 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr;
2939
2940 if (cma_any_addr(addr)) {
2941 memset(mgid, 0, sizeof *mgid);
2942 } else if (addr->sa_family == AF_INET6) {
2943 memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
2944 } else {
2945 mgid->raw[0] = 0xff;
2946 mgid->raw[1] = 0x0e;
2947 mgid->raw[2] = 0;
2948 mgid->raw[3] = 0;
2949 mgid->raw[4] = 0;
2950 mgid->raw[5] = 0;
2951 mgid->raw[6] = 0;
2952 mgid->raw[7] = 0;
2953 mgid->raw[8] = 0;
2954 mgid->raw[9] = 0;
2955 mgid->raw[10] = 0xff;
2956 mgid->raw[11] = 0xff;
2957 *(__be32 *)(&mgid->raw[12]) = sin->sin_addr.s_addr;
2958 }
2959 }
2960
cma_iboe_join_multicast(struct rdma_id_private * id_priv,struct cma_multicast * mc)2961 static int cma_iboe_join_multicast(struct rdma_id_private *id_priv,
2962 struct cma_multicast *mc)
2963 {
2964 struct iboe_mcast_work *work;
2965 struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
2966 int err;
2967 struct sockaddr *addr = (struct sockaddr *)&mc->addr;
2968 struct net_device *ndev = NULL;
2969
2970 if (cma_zero_addr((struct sockaddr *)&mc->addr))
2971 return -EINVAL;
2972
2973 work = kzalloc(sizeof *work, GFP_KERNEL);
2974 if (!work)
2975 return -ENOMEM;
2976
2977 mc->multicast.ib = kzalloc(sizeof(struct ib_sa_multicast), GFP_KERNEL);
2978 if (!mc->multicast.ib) {
2979 err = -ENOMEM;
2980 goto out1;
2981 }
2982
2983 cma_iboe_set_mgid(addr, &mc->multicast.ib->rec.mgid);
2984
2985 mc->multicast.ib->rec.pkey = cpu_to_be16(0xffff);
2986 if (id_priv->id.ps == RDMA_PS_UDP)
2987 mc->multicast.ib->rec.qkey = cpu_to_be32(RDMA_UDP_QKEY);
2988
2989 if (dev_addr->bound_dev_if)
2990 ndev = dev_get_by_index(&init_net, dev_addr->bound_dev_if);
2991 if (!ndev) {
2992 err = -ENODEV;
2993 goto out2;
2994 }
2995 mc->multicast.ib->rec.rate = iboe_get_rate(ndev);
2996 mc->multicast.ib->rec.hop_limit = 1;
2997 mc->multicast.ib->rec.mtu = iboe_get_mtu(ndev->mtu);
2998 dev_put(ndev);
2999 if (!mc->multicast.ib->rec.mtu) {
3000 err = -EINVAL;
3001 goto out2;
3002 }
3003 iboe_addr_get_sgid(dev_addr, &mc->multicast.ib->rec.port_gid);
3004 work->id = id_priv;
3005 work->mc = mc;
3006 INIT_WORK(&work->work, iboe_mcast_work_handler);
3007 kref_get(&mc->mcref);
3008 queue_work(cma_wq, &work->work);
3009
3010 return 0;
3011
3012 out2:
3013 kfree(mc->multicast.ib);
3014 out1:
3015 kfree(work);
3016 return err;
3017 }
3018
rdma_join_multicast(struct rdma_cm_id * id,struct sockaddr * addr,void * context)3019 int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
3020 void *context)
3021 {
3022 struct rdma_id_private *id_priv;
3023 struct cma_multicast *mc;
3024 int ret;
3025
3026 id_priv = container_of(id, struct rdma_id_private, id);
3027 if (!cma_comp(id_priv, CMA_ADDR_BOUND) &&
3028 !cma_comp(id_priv, CMA_ADDR_RESOLVED))
3029 return -EINVAL;
3030
3031 mc = kmalloc(sizeof *mc, GFP_KERNEL);
3032 if (!mc)
3033 return -ENOMEM;
3034
3035 memcpy(&mc->addr, addr, ip_addr_size(addr));
3036 mc->context = context;
3037 mc->id_priv = id_priv;
3038
3039 spin_lock(&id_priv->lock);
3040 list_add(&mc->list, &id_priv->mc_list);
3041 spin_unlock(&id_priv->lock);
3042
3043 switch (rdma_node_get_transport(id->device->node_type)) {
3044 case RDMA_TRANSPORT_IB:
3045 switch (rdma_port_get_link_layer(id->device, id->port_num)) {
3046 case IB_LINK_LAYER_INFINIBAND:
3047 ret = cma_join_ib_multicast(id_priv, mc);
3048 break;
3049 case IB_LINK_LAYER_ETHERNET:
3050 kref_init(&mc->mcref);
3051 ret = cma_iboe_join_multicast(id_priv, mc);
3052 break;
3053 default:
3054 ret = -EINVAL;
3055 }
3056 break;
3057 default:
3058 ret = -ENOSYS;
3059 break;
3060 }
3061
3062 if (ret) {
3063 spin_lock_irq(&id_priv->lock);
3064 list_del(&mc->list);
3065 spin_unlock_irq(&id_priv->lock);
3066 kfree(mc);
3067 }
3068 return ret;
3069 }
3070 EXPORT_SYMBOL(rdma_join_multicast);
3071
rdma_leave_multicast(struct rdma_cm_id * id,struct sockaddr * addr)3072 void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr)
3073 {
3074 struct rdma_id_private *id_priv;
3075 struct cma_multicast *mc;
3076
3077 id_priv = container_of(id, struct rdma_id_private, id);
3078 spin_lock_irq(&id_priv->lock);
3079 list_for_each_entry(mc, &id_priv->mc_list, list) {
3080 if (!memcmp(&mc->addr, addr, ip_addr_size(addr))) {
3081 list_del(&mc->list);
3082 spin_unlock_irq(&id_priv->lock);
3083
3084 if (id->qp)
3085 ib_detach_mcast(id->qp,
3086 &mc->multicast.ib->rec.mgid,
3087 mc->multicast.ib->rec.mlid);
3088 if (rdma_node_get_transport(id_priv->cma_dev->device->node_type) == RDMA_TRANSPORT_IB) {
3089 switch (rdma_port_get_link_layer(id->device, id->port_num)) {
3090 case IB_LINK_LAYER_INFINIBAND:
3091 ib_sa_free_multicast(mc->multicast.ib);
3092 kfree(mc);
3093 break;
3094 case IB_LINK_LAYER_ETHERNET:
3095 kref_put(&mc->mcref, release_mc);
3096 break;
3097 default:
3098 break;
3099 }
3100 }
3101 return;
3102 }
3103 }
3104 spin_unlock_irq(&id_priv->lock);
3105 }
3106 EXPORT_SYMBOL(rdma_leave_multicast);
3107
cma_netdev_change(struct net_device * ndev,struct rdma_id_private * id_priv)3108 static int cma_netdev_change(struct net_device *ndev, struct rdma_id_private *id_priv)
3109 {
3110 struct rdma_dev_addr *dev_addr;
3111 struct cma_ndev_work *work;
3112
3113 dev_addr = &id_priv->id.route.addr.dev_addr;
3114
3115 if ((dev_addr->bound_dev_if == ndev->ifindex) &&
3116 memcmp(dev_addr->src_dev_addr, ndev->dev_addr, ndev->addr_len)) {
3117 printk(KERN_INFO "RDMA CM addr change for ndev %s used by id %p\n",
3118 ndev->name, &id_priv->id);
3119 work = kzalloc(sizeof *work, GFP_KERNEL);
3120 if (!work)
3121 return -ENOMEM;
3122
3123 INIT_WORK(&work->work, cma_ndev_work_handler);
3124 work->id = id_priv;
3125 work->event.event = RDMA_CM_EVENT_ADDR_CHANGE;
3126 atomic_inc(&id_priv->refcount);
3127 queue_work(cma_wq, &work->work);
3128 }
3129
3130 return 0;
3131 }
3132
cma_netdev_callback(struct notifier_block * self,unsigned long event,void * ctx)3133 static int cma_netdev_callback(struct notifier_block *self, unsigned long event,
3134 void *ctx)
3135 {
3136 struct net_device *ndev = (struct net_device *)ctx;
3137 struct cma_device *cma_dev;
3138 struct rdma_id_private *id_priv;
3139 int ret = NOTIFY_DONE;
3140
3141 if (dev_net(ndev) != &init_net)
3142 return NOTIFY_DONE;
3143
3144 if (event != NETDEV_BONDING_FAILOVER)
3145 return NOTIFY_DONE;
3146
3147 if (!(ndev->flags & IFF_MASTER) || !(ndev->priv_flags & IFF_BONDING))
3148 return NOTIFY_DONE;
3149
3150 mutex_lock(&lock);
3151 list_for_each_entry(cma_dev, &dev_list, list)
3152 list_for_each_entry(id_priv, &cma_dev->id_list, list) {
3153 ret = cma_netdev_change(ndev, id_priv);
3154 if (ret)
3155 goto out;
3156 }
3157
3158 out:
3159 mutex_unlock(&lock);
3160 return ret;
3161 }
3162
3163 static struct notifier_block cma_nb = {
3164 .notifier_call = cma_netdev_callback
3165 };
3166
cma_add_one(struct ib_device * device)3167 static void cma_add_one(struct ib_device *device)
3168 {
3169 struct cma_device *cma_dev;
3170 struct rdma_id_private *id_priv;
3171
3172 cma_dev = kmalloc(sizeof *cma_dev, GFP_KERNEL);
3173 if (!cma_dev)
3174 return;
3175
3176 cma_dev->device = device;
3177
3178 init_completion(&cma_dev->comp);
3179 atomic_set(&cma_dev->refcount, 1);
3180 INIT_LIST_HEAD(&cma_dev->id_list);
3181 ib_set_client_data(device, &cma_client, cma_dev);
3182
3183 mutex_lock(&lock);
3184 list_add_tail(&cma_dev->list, &dev_list);
3185 list_for_each_entry(id_priv, &listen_any_list, list)
3186 cma_listen_on_dev(id_priv, cma_dev);
3187 mutex_unlock(&lock);
3188 }
3189
cma_remove_id_dev(struct rdma_id_private * id_priv)3190 static int cma_remove_id_dev(struct rdma_id_private *id_priv)
3191 {
3192 struct rdma_cm_event event;
3193 enum cma_state state;
3194 int ret = 0;
3195
3196 /* Record that we want to remove the device */
3197 state = cma_exch(id_priv, CMA_DEVICE_REMOVAL);
3198 if (state == CMA_DESTROYING)
3199 return 0;
3200
3201 cma_cancel_operation(id_priv, state);
3202 mutex_lock(&id_priv->handler_mutex);
3203
3204 /* Check for destruction from another callback. */
3205 if (!cma_comp(id_priv, CMA_DEVICE_REMOVAL))
3206 goto out;
3207
3208 memset(&event, 0, sizeof event);
3209 event.event = RDMA_CM_EVENT_DEVICE_REMOVAL;
3210 ret = id_priv->id.event_handler(&id_priv->id, &event);
3211 out:
3212 mutex_unlock(&id_priv->handler_mutex);
3213 return ret;
3214 }
3215
cma_process_remove(struct cma_device * cma_dev)3216 static void cma_process_remove(struct cma_device *cma_dev)
3217 {
3218 struct rdma_id_private *id_priv;
3219 int ret;
3220
3221 mutex_lock(&lock);
3222 while (!list_empty(&cma_dev->id_list)) {
3223 id_priv = list_entry(cma_dev->id_list.next,
3224 struct rdma_id_private, list);
3225
3226 list_del(&id_priv->listen_list);
3227 list_del_init(&id_priv->list);
3228 atomic_inc(&id_priv->refcount);
3229 mutex_unlock(&lock);
3230
3231 ret = id_priv->internal_id ? 1 : cma_remove_id_dev(id_priv);
3232 cma_deref_id(id_priv);
3233 if (ret)
3234 rdma_destroy_id(&id_priv->id);
3235
3236 mutex_lock(&lock);
3237 }
3238 mutex_unlock(&lock);
3239
3240 cma_deref_dev(cma_dev);
3241 wait_for_completion(&cma_dev->comp);
3242 }
3243
cma_remove_one(struct ib_device * device)3244 static void cma_remove_one(struct ib_device *device)
3245 {
3246 struct cma_device *cma_dev;
3247
3248 cma_dev = ib_get_client_data(device, &cma_client);
3249 if (!cma_dev)
3250 return;
3251
3252 mutex_lock(&lock);
3253 list_del(&cma_dev->list);
3254 mutex_unlock(&lock);
3255
3256 cma_process_remove(cma_dev);
3257 kfree(cma_dev);
3258 }
3259
cma_init(void)3260 static int __init cma_init(void)
3261 {
3262 int ret;
3263
3264 cma_wq = create_singlethread_workqueue("rdma_cm");
3265 if (!cma_wq)
3266 return -ENOMEM;
3267
3268 ib_sa_register_client(&sa_client);
3269 rdma_addr_register_client(&addr_client);
3270 register_netdevice_notifier(&cma_nb);
3271
3272 ret = ib_register_client(&cma_client);
3273 if (ret)
3274 goto err;
3275 return 0;
3276
3277 err:
3278 unregister_netdevice_notifier(&cma_nb);
3279 rdma_addr_unregister_client(&addr_client);
3280 ib_sa_unregister_client(&sa_client);
3281 destroy_workqueue(cma_wq);
3282 return ret;
3283 }
3284
cma_cleanup(void)3285 static void __exit cma_cleanup(void)
3286 {
3287 ib_unregister_client(&cma_client);
3288 unregister_netdevice_notifier(&cma_nb);
3289 rdma_addr_unregister_client(&addr_client);
3290 ib_sa_unregister_client(&sa_client);
3291 destroy_workqueue(cma_wq);
3292 idr_destroy(&sdp_ps);
3293 idr_destroy(&tcp_ps);
3294 idr_destroy(&udp_ps);
3295 idr_destroy(&ipoib_ps);
3296 }
3297
3298 module_init(cma_init);
3299 module_exit(cma_cleanup);
3300