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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris...
[linux/fpc-iii.git] / drivers / infiniband / core / ucma.c
blob56a4b7ca7ee38ba118796d6d5e3eb770bbebc69a
1 /*
2 * Copyright (c) 2005-2006 Intel Corporation. All rights reserved.
3 *
4 * This software is available to you under a choice of one of two
5 * licenses. You may choose to be licensed under the terms of the GNU
6 * General Public License (GPL) Version 2, available from the file
7 * COPYING in the main directory of this source tree, or the
8 * OpenIB.org BSD license below:
9 *
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
12 * conditions are met:
13 *
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
16 * disclaimer.
17 *
18 * - Redistributions in binary form must reproduce the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30 * SOFTWARE.
31 */
32
33 #include <linux/completion.h>
34 #include <linux/file.h>
35 #include <linux/mutex.h>
36 #include <linux/poll.h>
37 #include <linux/sched.h>
38 #include <linux/idr.h>
39 #include <linux/in.h>
40 #include <linux/in6.h>
41 #include <linux/miscdevice.h>
42 #include <linux/slab.h>
43 #include <linux/sysctl.h>
44 #include <linux/module.h>
45
46 #include <rdma/rdma_user_cm.h>
47 #include <rdma/ib_marshall.h>
48 #include <rdma/rdma_cm.h>
49 #include <rdma/rdma_cm_ib.h>
50 #include <rdma/ib_addr.h>
51 #include <rdma/ib.h>
52
53 MODULE_AUTHOR("Sean Hefty");
54 MODULE_DESCRIPTION("RDMA Userspace Connection Manager Access");
55 MODULE_LICENSE("Dual BSD/GPL");
56
57 static unsigned int max_backlog = 1024;
58
59 static struct ctl_table_header *ucma_ctl_table_hdr;
60 static struct ctl_table ucma_ctl_table[] = {
61 {
62 .procname = "max_backlog",
63 .data = &max_backlog,
64 .maxlen = sizeof max_backlog,
65 .mode = 0644,
66 .proc_handler = proc_dointvec,
67 },
68 { }
69 };
70
71 struct ucma_file {
72 struct mutex mut;
73 struct file *filp;
74 struct list_head ctx_list;
75 struct list_head event_list;
76 wait_queue_head_t poll_wait;
77 };
78
79 struct ucma_context {
80 int id;
81 struct completion comp;
82 atomic_t ref;
83 int events_reported;
84 int backlog;
85
86 struct ucma_file *file;
87 struct rdma_cm_id *cm_id;
88 u64 uid;
89
90 struct list_head list;
91 struct list_head mc_list;
92 };
93
94 struct ucma_multicast {
95 struct ucma_context *ctx;
96 int id;
97 int events_reported;
98
99 u64 uid;
100 struct list_head list;
101 struct sockaddr_storage addr;
102 };
103
104 struct ucma_event {
105 struct ucma_context *ctx;
106 struct ucma_multicast *mc;
107 struct list_head list;
108 struct rdma_cm_id *cm_id;
109 struct rdma_ucm_event_resp resp;
110 };
111
112 static DEFINE_MUTEX(mut);
113 static DEFINE_IDR(ctx_idr);
114 static DEFINE_IDR(multicast_idr);
115
116 static inline struct ucma_context *_ucma_find_context(int id,
117 struct ucma_file *file)
118 {
119 struct ucma_context *ctx;
120
121 ctx = idr_find(&ctx_idr, id);
122 if (!ctx)
123 ctx = ERR_PTR(-ENOENT);
124 else if (ctx->file != file)
125 ctx = ERR_PTR(-EINVAL);
126 return ctx;
127 }
128
129 static struct ucma_context *ucma_get_ctx(struct ucma_file *file, int id)
130 {
131 struct ucma_context *ctx;
132
133 mutex_lock(&mut);
134 ctx = _ucma_find_context(id, file);
135 if (!IS_ERR(ctx))
136 atomic_inc(&ctx->ref);
137 mutex_unlock(&mut);
138 return ctx;
139 }
140
141 static void ucma_put_ctx(struct ucma_context *ctx)
142 {
143 if (atomic_dec_and_test(&ctx->ref))
144 complete(&ctx->comp);
145 }
146
147 static struct ucma_context *ucma_alloc_ctx(struct ucma_file *file)
148 {
149 struct ucma_context *ctx;
150
151 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
152 if (!ctx)
153 return NULL;
154
155 atomic_set(&ctx->ref, 1);
156 init_completion(&ctx->comp);
157 INIT_LIST_HEAD(&ctx->mc_list);
158 ctx->file = file;
159
160 mutex_lock(&mut);
161 ctx->id = idr_alloc(&ctx_idr, ctx, 0, 0, GFP_KERNEL);
162 mutex_unlock(&mut);
163 if (ctx->id < 0)
164 goto error;
165
166 list_add_tail(&ctx->list, &file->ctx_list);
167 return ctx;
168
169 error:
170 kfree(ctx);
171 return NULL;
172 }
173
174 static struct ucma_multicast* ucma_alloc_multicast(struct ucma_context *ctx)
175 {
176 struct ucma_multicast *mc;
177
178 mc = kzalloc(sizeof(*mc), GFP_KERNEL);
179 if (!mc)
180 return NULL;
181
182 mutex_lock(&mut);
183 mc->id = idr_alloc(&multicast_idr, mc, 0, 0, GFP_KERNEL);
184 mutex_unlock(&mut);
185 if (mc->id < 0)
186 goto error;
187
188 mc->ctx = ctx;
189 list_add_tail(&mc->list, &ctx->mc_list);
190 return mc;
191
192 error:
193 kfree(mc);
194 return NULL;
195 }
196
197 static void ucma_copy_conn_event(struct rdma_ucm_conn_param *dst,
198 struct rdma_conn_param *src)
199 {
200 if (src->private_data_len)
201 memcpy(dst->private_data, src->private_data,
202 src->private_data_len);
203 dst->private_data_len = src->private_data_len;
204 dst->responder_resources =src->responder_resources;
205 dst->initiator_depth = src->initiator_depth;
206 dst->flow_control = src->flow_control;
207 dst->retry_count = src->retry_count;
208 dst->rnr_retry_count = src->rnr_retry_count;
209 dst->srq = src->srq;
210 dst->qp_num = src->qp_num;
211 }
212
213 static void ucma_copy_ud_event(struct rdma_ucm_ud_param *dst,
214 struct rdma_ud_param *src)
215 {
216 if (src->private_data_len)
217 memcpy(dst->private_data, src->private_data,
218 src->private_data_len);
219 dst->private_data_len = src->private_data_len;
220 ib_copy_ah_attr_to_user(&dst->ah_attr, &src->ah_attr);
221 dst->qp_num = src->qp_num;
222 dst->qkey = src->qkey;
223 }
224
225 static void ucma_set_event_context(struct ucma_context *ctx,
226 struct rdma_cm_event *event,
227 struct ucma_event *uevent)
228 {
229 uevent->ctx = ctx;
230 switch (event->event) {
231 case RDMA_CM_EVENT_MULTICAST_JOIN:
232 case RDMA_CM_EVENT_MULTICAST_ERROR:
233 uevent->mc = (struct ucma_multicast *)
234 event->param.ud.private_data;
235 uevent->resp.uid = uevent->mc->uid;
236 uevent->resp.id = uevent->mc->id;
237 break;
238 default:
239 uevent->resp.uid = ctx->uid;
240 uevent->resp.id = ctx->id;
241 break;
242 }
243 }
244
245 static int ucma_event_handler(struct rdma_cm_id *cm_id,
246 struct rdma_cm_event *event)
247 {
248 struct ucma_event *uevent;
249 struct ucma_context *ctx = cm_id->context;
250 int ret = 0;
251
252 uevent = kzalloc(sizeof(*uevent), GFP_KERNEL);
253 if (!uevent)
254 return event->event == RDMA_CM_EVENT_CONNECT_REQUEST;
255
256 mutex_lock(&ctx->file->mut);
257 uevent->cm_id = cm_id;
258 ucma_set_event_context(ctx, event, uevent);
259 uevent->resp.event = event->event;
260 uevent->resp.status = event->status;
261 if (cm_id->qp_type == IB_QPT_UD)
262 ucma_copy_ud_event(&uevent->resp.param.ud, &event->param.ud);
263 else
264 ucma_copy_conn_event(&uevent->resp.param.conn,
265 &event->param.conn);
266
267 if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST) {
268 if (!ctx->backlog) {
269 ret = -ENOMEM;
270 kfree(uevent);
271 goto out;
272 }
273 ctx->backlog--;
274 } else if (!ctx->uid || ctx->cm_id != cm_id) {
275 /*
276 * We ignore events for new connections until userspace has set
277 * their context. This can only happen if an error occurs on a
278 * new connection before the user accepts it. This is okay,
279 * since the accept will just fail later.
280 */
281 kfree(uevent);
282 goto out;
283 }
284
285 list_add_tail(&uevent->list, &ctx->file->event_list);
286 wake_up_interruptible(&ctx->file->poll_wait);
287 out:
288 mutex_unlock(&ctx->file->mut);
289 return ret;
290 }
291
292 static ssize_t ucma_get_event(struct ucma_file *file, const char __user *inbuf,
293 int in_len, int out_len)
294 {
295 struct ucma_context *ctx;
296 struct rdma_ucm_get_event cmd;
297 struct ucma_event *uevent;
298 int ret = 0;
299
300 if (out_len < sizeof uevent->resp)
301 return -ENOSPC;
302
303 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
304 return -EFAULT;
305
306 mutex_lock(&file->mut);
307 while (list_empty(&file->event_list)) {
308 mutex_unlock(&file->mut);
309
310 if (file->filp->f_flags & O_NONBLOCK)
311 return -EAGAIN;
312
313 if (wait_event_interruptible(file->poll_wait,
314 !list_empty(&file->event_list)))
315 return -ERESTARTSYS;
316
317 mutex_lock(&file->mut);
318 }
319
320 uevent = list_entry(file->event_list.next, struct ucma_event, list);
321
322 if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST) {
323 ctx = ucma_alloc_ctx(file);
324 if (!ctx) {
325 ret = -ENOMEM;
326 goto done;
327 }
328 uevent->ctx->backlog++;
329 ctx->cm_id = uevent->cm_id;
330 ctx->cm_id->context = ctx;
331 uevent->resp.id = ctx->id;
332 }
333
334 if (copy_to_user((void __user *)(unsigned long)cmd.response,
335 &uevent->resp, sizeof uevent->resp)) {
336 ret = -EFAULT;
337 goto done;
338 }
339
340 list_del(&uevent->list);
341 uevent->ctx->events_reported++;
342 if (uevent->mc)
343 uevent->mc->events_reported++;
344 kfree(uevent);
345 done:
346 mutex_unlock(&file->mut);
347 return ret;
348 }
349
350 static int ucma_get_qp_type(struct rdma_ucm_create_id *cmd, enum ib_qp_type *qp_type)
351 {
352 switch (cmd->ps) {
353 case RDMA_PS_TCP:
354 *qp_type = IB_QPT_RC;
355 return 0;
356 case RDMA_PS_UDP:
357 case RDMA_PS_IPOIB:
358 *qp_type = IB_QPT_UD;
359 return 0;
360 case RDMA_PS_IB:
361 *qp_type = cmd->qp_type;
362 return 0;
363 default:
364 return -EINVAL;
365 }
366 }
367
368 static ssize_t ucma_create_id(struct ucma_file *file, const char __user *inbuf,
369 int in_len, int out_len)
370 {
371 struct rdma_ucm_create_id cmd;
372 struct rdma_ucm_create_id_resp resp;
373 struct ucma_context *ctx;
374 enum ib_qp_type qp_type;
375 int ret;
376
377 if (out_len < sizeof(resp))
378 return -ENOSPC;
379
380 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
381 return -EFAULT;
382
383 ret = ucma_get_qp_type(&cmd, &qp_type);
384 if (ret)
385 return ret;
386
387 mutex_lock(&file->mut);
388 ctx = ucma_alloc_ctx(file);
389 mutex_unlock(&file->mut);
390 if (!ctx)
391 return -ENOMEM;
392
393 ctx->uid = cmd.uid;
394 ctx->cm_id = rdma_create_id(ucma_event_handler, ctx, cmd.ps, qp_type);
395 if (IS_ERR(ctx->cm_id)) {
396 ret = PTR_ERR(ctx->cm_id);
397 goto err1;
398 }
399
400 resp.id = ctx->id;
401 if (copy_to_user((void __user *)(unsigned long)cmd.response,
402 &resp, sizeof(resp))) {
403 ret = -EFAULT;
404 goto err2;
405 }
406 return 0;
407
408 err2:
409 rdma_destroy_id(ctx->cm_id);
410 err1:
411 mutex_lock(&mut);
412 idr_remove(&ctx_idr, ctx->id);
413 mutex_unlock(&mut);
414 kfree(ctx);
415 return ret;
416 }
417
418 static void ucma_cleanup_multicast(struct ucma_context *ctx)
419 {
420 struct ucma_multicast *mc, *tmp;
421
422 mutex_lock(&mut);
423 list_for_each_entry_safe(mc, tmp, &ctx->mc_list, list) {
424 list_del(&mc->list);
425 idr_remove(&multicast_idr, mc->id);
426 kfree(mc);
427 }
428 mutex_unlock(&mut);
429 }
430
431 static void ucma_cleanup_mc_events(struct ucma_multicast *mc)
432 {
433 struct ucma_event *uevent, *tmp;
434
435 list_for_each_entry_safe(uevent, tmp, &mc->ctx->file->event_list, list) {
436 if (uevent->mc != mc)
437 continue;
438
439 list_del(&uevent->list);
440 kfree(uevent);
441 }
442 }
443
444 /*
445 * We cannot hold file->mut when calling rdma_destroy_id() or we can
446 * deadlock. We also acquire file->mut in ucma_event_handler(), and
447 * rdma_destroy_id() will wait until all callbacks have completed.
448 */
449 static int ucma_free_ctx(struct ucma_context *ctx)
450 {
451 int events_reported;
452 struct ucma_event *uevent, *tmp;
453 LIST_HEAD(list);
454
455 /* No new events will be generated after destroying the id. */
456 rdma_destroy_id(ctx->cm_id);
457
458 ucma_cleanup_multicast(ctx);
459
460 /* Cleanup events not yet reported to the user. */
461 mutex_lock(&ctx->file->mut);
462 list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list) {
463 if (uevent->ctx == ctx)
464 list_move_tail(&uevent->list, &list);
465 }
466 list_del(&ctx->list);
467 mutex_unlock(&ctx->file->mut);
468
469 list_for_each_entry_safe(uevent, tmp, &list, list) {
470 list_del(&uevent->list);
471 if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST)
472 rdma_destroy_id(uevent->cm_id);
473 kfree(uevent);
474 }
475
476 events_reported = ctx->events_reported;
477 kfree(ctx);
478 return events_reported;
479 }
480
481 static ssize_t ucma_destroy_id(struct ucma_file *file, const char __user *inbuf,
482 int in_len, int out_len)
483 {
484 struct rdma_ucm_destroy_id cmd;
485 struct rdma_ucm_destroy_id_resp resp;
486 struct ucma_context *ctx;
487 int ret = 0;
488
489 if (out_len < sizeof(resp))
490 return -ENOSPC;
491
492 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
493 return -EFAULT;
494
495 mutex_lock(&mut);
496 ctx = _ucma_find_context(cmd.id, file);
497 if (!IS_ERR(ctx))
498 idr_remove(&ctx_idr, ctx->id);
499 mutex_unlock(&mut);
500
501 if (IS_ERR(ctx))
502 return PTR_ERR(ctx);
503
504 ucma_put_ctx(ctx);
505 wait_for_completion(&ctx->comp);
506 resp.events_reported = ucma_free_ctx(ctx);
507
508 if (copy_to_user((void __user *)(unsigned long)cmd.response,
509 &resp, sizeof(resp)))
510 ret = -EFAULT;
511
512 return ret;
513 }
514
515 static ssize_t ucma_bind_ip(struct ucma_file *file, const char __user *inbuf,
516 int in_len, int out_len)
517 {
518 struct rdma_ucm_bind_ip cmd;
519 struct ucma_context *ctx;
520 int ret;
521
522 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
523 return -EFAULT;
524
525 ctx = ucma_get_ctx(file, cmd.id);
526 if (IS_ERR(ctx))
527 return PTR_ERR(ctx);
528
529 ret = rdma_bind_addr(ctx->cm_id, (struct sockaddr *) &cmd.addr);
530 ucma_put_ctx(ctx);
531 return ret;
532 }
533
534 static ssize_t ucma_bind(struct ucma_file *file, const char __user *inbuf,
535 int in_len, int out_len)
536 {
537 struct rdma_ucm_bind cmd;
538 struct sockaddr *addr;
539 struct ucma_context *ctx;
540 int ret;
541
542 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
543 return -EFAULT;
544
545 addr = (struct sockaddr *) &cmd.addr;
546 if (cmd.reserved || !cmd.addr_size || (cmd.addr_size != rdma_addr_size(addr)))
547 return -EINVAL;
548
549 ctx = ucma_get_ctx(file, cmd.id);
550 if (IS_ERR(ctx))
551 return PTR_ERR(ctx);
552
553 ret = rdma_bind_addr(ctx->cm_id, addr);
554 ucma_put_ctx(ctx);
555 return ret;
556 }
557
558 static ssize_t ucma_resolve_ip(struct ucma_file *file,
559 const char __user *inbuf,
560 int in_len, int out_len)
561 {
562 struct rdma_ucm_resolve_ip cmd;
563 struct ucma_context *ctx;
564 int ret;
565
566 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
567 return -EFAULT;
568
569 ctx = ucma_get_ctx(file, cmd.id);
570 if (IS_ERR(ctx))
571 return PTR_ERR(ctx);
572
573 ret = rdma_resolve_addr(ctx->cm_id, (struct sockaddr *) &cmd.src_addr,
574 (struct sockaddr *) &cmd.dst_addr,
575 cmd.timeout_ms);
576 ucma_put_ctx(ctx);
577 return ret;
578 }
579
580 static ssize_t ucma_resolve_addr(struct ucma_file *file,
581 const char __user *inbuf,
582 int in_len, int out_len)
583 {
584 struct rdma_ucm_resolve_addr cmd;
585 struct sockaddr *src, *dst;
586 struct ucma_context *ctx;
587 int ret;
588
589 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
590 return -EFAULT;
591
592 src = (struct sockaddr *) &cmd.src_addr;
593 dst = (struct sockaddr *) &cmd.dst_addr;
594 if (cmd.reserved || (cmd.src_size && (cmd.src_size != rdma_addr_size(src))) ||
595 !cmd.dst_size || (cmd.dst_size != rdma_addr_size(dst)))
596 return -EINVAL;
597
598 ctx = ucma_get_ctx(file, cmd.id);
599 if (IS_ERR(ctx))
600 return PTR_ERR(ctx);
601
602 ret = rdma_resolve_addr(ctx->cm_id, src, dst, cmd.timeout_ms);
603 ucma_put_ctx(ctx);
604 return ret;
605 }
606
607 static ssize_t ucma_resolve_route(struct ucma_file *file,
608 const char __user *inbuf,
609 int in_len, int out_len)
610 {
611 struct rdma_ucm_resolve_route cmd;
612 struct ucma_context *ctx;
613 int ret;
614
615 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
616 return -EFAULT;
617
618 ctx = ucma_get_ctx(file, cmd.id);
619 if (IS_ERR(ctx))
620 return PTR_ERR(ctx);
621
622 ret = rdma_resolve_route(ctx->cm_id, cmd.timeout_ms);
623 ucma_put_ctx(ctx);
624 return ret;
625 }
626
627 static void ucma_copy_ib_route(struct rdma_ucm_query_route_resp *resp,
628 struct rdma_route *route)
629 {
630 struct rdma_dev_addr *dev_addr;
631
632 resp->num_paths = route->num_paths;
633 switch (route->num_paths) {
634 case 0:
635 dev_addr = &route->addr.dev_addr;
636 rdma_addr_get_dgid(dev_addr,
637 (union ib_gid *) &resp->ib_route[0].dgid);
638 rdma_addr_get_sgid(dev_addr,
639 (union ib_gid *) &resp->ib_route[0].sgid);
640 resp->ib_route[0].pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
641 break;
642 case 2:
643 ib_copy_path_rec_to_user(&resp->ib_route[1],
644 &route->path_rec[1]);
645 /* fall through */
646 case 1:
647 ib_copy_path_rec_to_user(&resp->ib_route[0],
648 &route->path_rec[0]);
649 break;
650 default:
651 break;
652 }
653 }
654
655 static void ucma_copy_iboe_route(struct rdma_ucm_query_route_resp *resp,
656 struct rdma_route *route)
657 {
658
659 resp->num_paths = route->num_paths;
660 switch (route->num_paths) {
661 case 0:
662 rdma_ip2gid((struct sockaddr *)&route->addr.dst_addr,
663 (union ib_gid *)&resp->ib_route[0].dgid);
664 rdma_ip2gid((struct sockaddr *)&route->addr.src_addr,
665 (union ib_gid *)&resp->ib_route[0].sgid);
666 resp->ib_route[0].pkey = cpu_to_be16(0xffff);
667 break;
668 case 2:
669 ib_copy_path_rec_to_user(&resp->ib_route[1],
670 &route->path_rec[1]);
671 /* fall through */
672 case 1:
673 ib_copy_path_rec_to_user(&resp->ib_route[0],
674 &route->path_rec[0]);
675 break;
676 default:
677 break;
678 }
679 }
680
681 static void ucma_copy_iw_route(struct rdma_ucm_query_route_resp *resp,
682 struct rdma_route *route)
683 {
684 struct rdma_dev_addr *dev_addr;
685
686 dev_addr = &route->addr.dev_addr;
687 rdma_addr_get_dgid(dev_addr, (union ib_gid *) &resp->ib_route[0].dgid);
688 rdma_addr_get_sgid(dev_addr, (union ib_gid *) &resp->ib_route[0].sgid);
689 }
690
691 static ssize_t ucma_query_route(struct ucma_file *file,
692 const char __user *inbuf,
693 int in_len, int out_len)
694 {
695 struct rdma_ucm_query cmd;
696 struct rdma_ucm_query_route_resp resp;
697 struct ucma_context *ctx;
698 struct sockaddr *addr;
699 int ret = 0;
700
701 if (out_len < sizeof(resp))
702 return -ENOSPC;
703
704 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
705 return -EFAULT;
706
707 ctx = ucma_get_ctx(file, cmd.id);
708 if (IS_ERR(ctx))
709 return PTR_ERR(ctx);
710
711 memset(&resp, 0, sizeof resp);
712 addr = (struct sockaddr *) &ctx->cm_id->route.addr.src_addr;
713 memcpy(&resp.src_addr, addr, addr->sa_family == AF_INET ?
714 sizeof(struct sockaddr_in) :
715 sizeof(struct sockaddr_in6));
716 addr = (struct sockaddr *) &ctx->cm_id->route.addr.dst_addr;
717 memcpy(&resp.dst_addr, addr, addr->sa_family == AF_INET ?
718 sizeof(struct sockaddr_in) :
719 sizeof(struct sockaddr_in6));
720 if (!ctx->cm_id->device)
721 goto out;
722
723 resp.node_guid = (__force __u64) ctx->cm_id->device->node_guid;
724 resp.port_num = ctx->cm_id->port_num;
725 switch (rdma_node_get_transport(ctx->cm_id->device->node_type)) {
726 case RDMA_TRANSPORT_IB:
727 switch (rdma_port_get_link_layer(ctx->cm_id->device,
728 ctx->cm_id->port_num)) {
729 case IB_LINK_LAYER_INFINIBAND:
730 ucma_copy_ib_route(&resp, &ctx->cm_id->route);
731 break;
732 case IB_LINK_LAYER_ETHERNET:
733 ucma_copy_iboe_route(&resp, &ctx->cm_id->route);
734 break;
735 default:
736 break;
737 }
738 break;
739 case RDMA_TRANSPORT_IWARP:
740 ucma_copy_iw_route(&resp, &ctx->cm_id->route);
741 break;
742 default:
743 break;
744 }
745
746 out:
747 if (copy_to_user((void __user *)(unsigned long)cmd.response,
748 &resp, sizeof(resp)))
749 ret = -EFAULT;
750
751 ucma_put_ctx(ctx);
752 return ret;
753 }
754
755 static void ucma_query_device_addr(struct rdma_cm_id *cm_id,
756 struct rdma_ucm_query_addr_resp *resp)
757 {
758 if (!cm_id->device)
759 return;
760
761 resp->node_guid = (__force __u64) cm_id->device->node_guid;
762 resp->port_num = cm_id->port_num;
763 resp->pkey = (__force __u16) cpu_to_be16(
764 ib_addr_get_pkey(&cm_id->route.addr.dev_addr));
765 }
766
767 static ssize_t ucma_query_addr(struct ucma_context *ctx,
768 void __user *response, int out_len)
769 {
770 struct rdma_ucm_query_addr_resp resp;
771 struct sockaddr *addr;
772 int ret = 0;
773
774 if (out_len < sizeof(resp))
775 return -ENOSPC;
776
777 memset(&resp, 0, sizeof resp);
778
779 addr = (struct sockaddr *) &ctx->cm_id->route.addr.src_addr;
780 resp.src_size = rdma_addr_size(addr);
781 memcpy(&resp.src_addr, addr, resp.src_size);
782
783 addr = (struct sockaddr *) &ctx->cm_id->route.addr.dst_addr;
784 resp.dst_size = rdma_addr_size(addr);
785 memcpy(&resp.dst_addr, addr, resp.dst_size);
786
787 ucma_query_device_addr(ctx->cm_id, &resp);
788
789 if (copy_to_user(response, &resp, sizeof(resp)))
790 ret = -EFAULT;
791
792 return ret;
793 }
794
795 static ssize_t ucma_query_path(struct ucma_context *ctx,
796 void __user *response, int out_len)
797 {
798 struct rdma_ucm_query_path_resp *resp;
799 int i, ret = 0;
800
801 if (out_len < sizeof(*resp))
802 return -ENOSPC;
803
804 resp = kzalloc(out_len, GFP_KERNEL);
805 if (!resp)
806 return -ENOMEM;
807
808 resp->num_paths = ctx->cm_id->route.num_paths;
809 for (i = 0, out_len -= sizeof(*resp);
810 i < resp->num_paths && out_len > sizeof(struct ib_path_rec_data);
811 i++, out_len -= sizeof(struct ib_path_rec_data)) {
812
813 resp->path_data[i].flags = IB_PATH_GMP | IB_PATH_PRIMARY |
814 IB_PATH_BIDIRECTIONAL;
815 ib_sa_pack_path(&ctx->cm_id->route.path_rec[i],
816 &resp->path_data[i].path_rec);
817 }
818
819 if (copy_to_user(response, resp,
820 sizeof(*resp) + (i * sizeof(struct ib_path_rec_data))))
821 ret = -EFAULT;
822
823 kfree(resp);
824 return ret;
825 }
826
827 static ssize_t ucma_query_gid(struct ucma_context *ctx,
828 void __user *response, int out_len)
829 {
830 struct rdma_ucm_query_addr_resp resp;
831 struct sockaddr_ib *addr;
832 int ret = 0;
833
834 if (out_len < sizeof(resp))
835 return -ENOSPC;
836
837 memset(&resp, 0, sizeof resp);
838
839 ucma_query_device_addr(ctx->cm_id, &resp);
840
841 addr = (struct sockaddr_ib *) &resp.src_addr;
842 resp.src_size = sizeof(*addr);
843 if (ctx->cm_id->route.addr.src_addr.ss_family == AF_IB) {
844 memcpy(addr, &ctx->cm_id->route.addr.src_addr, resp.src_size);
845 } else {
846 addr->sib_family = AF_IB;
847 addr->sib_pkey = (__force __be16) resp.pkey;
848 rdma_addr_get_sgid(&ctx->cm_id->route.addr.dev_addr,
849 (union ib_gid *) &addr->sib_addr);
850 addr->sib_sid = rdma_get_service_id(ctx->cm_id, (struct sockaddr *)
851 &ctx->cm_id->route.addr.src_addr);
852 }
853
854 addr = (struct sockaddr_ib *) &resp.dst_addr;
855 resp.dst_size = sizeof(*addr);
856 if (ctx->cm_id->route.addr.dst_addr.ss_family == AF_IB) {
857 memcpy(addr, &ctx->cm_id->route.addr.dst_addr, resp.dst_size);
858 } else {
859 addr->sib_family = AF_IB;
860 addr->sib_pkey = (__force __be16) resp.pkey;
861 rdma_addr_get_dgid(&ctx->cm_id->route.addr.dev_addr,
862 (union ib_gid *) &addr->sib_addr);
863 addr->sib_sid = rdma_get_service_id(ctx->cm_id, (struct sockaddr *)
864 &ctx->cm_id->route.addr.dst_addr);
865 }
866
867 if (copy_to_user(response, &resp, sizeof(resp)))
868 ret = -EFAULT;
869
870 return ret;
871 }
872
873 static ssize_t ucma_query(struct ucma_file *file,
874 const char __user *inbuf,
875 int in_len, int out_len)
876 {
877 struct rdma_ucm_query cmd;
878 struct ucma_context *ctx;
879 void __user *response;
880 int ret;
881
882 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
883 return -EFAULT;
884
885 response = (void __user *)(unsigned long) cmd.response;
886 ctx = ucma_get_ctx(file, cmd.id);
887 if (IS_ERR(ctx))
888 return PTR_ERR(ctx);
889
890 switch (cmd.option) {
891 case RDMA_USER_CM_QUERY_ADDR:
892 ret = ucma_query_addr(ctx, response, out_len);
893 break;
894 case RDMA_USER_CM_QUERY_PATH:
895 ret = ucma_query_path(ctx, response, out_len);
896 break;
897 case RDMA_USER_CM_QUERY_GID:
898 ret = ucma_query_gid(ctx, response, out_len);
899 break;
900 default:
901 ret = -ENOSYS;
902 break;
903 }
904
905 ucma_put_ctx(ctx);
906 return ret;
907 }
908
909 static void ucma_copy_conn_param(struct rdma_cm_id *id,
910 struct rdma_conn_param *dst,
911 struct rdma_ucm_conn_param *src)
912 {
913 dst->private_data = src->private_data;
914 dst->private_data_len = src->private_data_len;
915 dst->responder_resources =src->responder_resources;
916 dst->initiator_depth = src->initiator_depth;
917 dst->flow_control = src->flow_control;
918 dst->retry_count = src->retry_count;
919 dst->rnr_retry_count = src->rnr_retry_count;
920 dst->srq = src->srq;
921 dst->qp_num = src->qp_num;
922 dst->qkey = (id->route.addr.src_addr.ss_family == AF_IB) ? src->qkey : 0;
923 }
924
925 static ssize_t ucma_connect(struct ucma_file *file, const char __user *inbuf,
926 int in_len, int out_len)
927 {
928 struct rdma_ucm_connect cmd;
929 struct rdma_conn_param conn_param;
930 struct ucma_context *ctx;
931 int ret;
932
933 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
934 return -EFAULT;
935
936 if (!cmd.conn_param.valid)
937 return -EINVAL;
938
939 ctx = ucma_get_ctx(file, cmd.id);
940 if (IS_ERR(ctx))
941 return PTR_ERR(ctx);
942
943 ucma_copy_conn_param(ctx->cm_id, &conn_param, &cmd.conn_param);
944 ret = rdma_connect(ctx->cm_id, &conn_param);
945 ucma_put_ctx(ctx);
946 return ret;
947 }
948
949 static ssize_t ucma_listen(struct ucma_file *file, const char __user *inbuf,
950 int in_len, int out_len)
951 {
952 struct rdma_ucm_listen cmd;
953 struct ucma_context *ctx;
954 int ret;
955
956 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
957 return -EFAULT;
958
959 ctx = ucma_get_ctx(file, cmd.id);
960 if (IS_ERR(ctx))
961 return PTR_ERR(ctx);
962
963 ctx->backlog = cmd.backlog > 0 && cmd.backlog < max_backlog ?
964 cmd.backlog : max_backlog;
965 ret = rdma_listen(ctx->cm_id, ctx->backlog);
966 ucma_put_ctx(ctx);
967 return ret;
968 }
969
970 static ssize_t ucma_accept(struct ucma_file *file, const char __user *inbuf,
971 int in_len, int out_len)
972 {
973 struct rdma_ucm_accept cmd;
974 struct rdma_conn_param conn_param;
975 struct ucma_context *ctx;
976 int ret;
977
978 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
979 return -EFAULT;
980
981 ctx = ucma_get_ctx(file, cmd.id);
982 if (IS_ERR(ctx))
983 return PTR_ERR(ctx);
984
985 if (cmd.conn_param.valid) {
986 ucma_copy_conn_param(ctx->cm_id, &conn_param, &cmd.conn_param);
987 mutex_lock(&file->mut);
988 ret = rdma_accept(ctx->cm_id, &conn_param);
989 if (!ret)
990 ctx->uid = cmd.uid;
991 mutex_unlock(&file->mut);
992 } else
993 ret = rdma_accept(ctx->cm_id, NULL);
994
995 ucma_put_ctx(ctx);
996 return ret;
997 }
998
999 static ssize_t ucma_reject(struct ucma_file *file, const char __user *inbuf,
1000 int in_len, int out_len)
1001 {
1002 struct rdma_ucm_reject cmd;
1003 struct ucma_context *ctx;
1004 int ret;
1005
1006 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1007 return -EFAULT;
1008
1009 ctx = ucma_get_ctx(file, cmd.id);
1010 if (IS_ERR(ctx))
1011 return PTR_ERR(ctx);
1012
1013 ret = rdma_reject(ctx->cm_id, cmd.private_data, cmd.private_data_len);
1014 ucma_put_ctx(ctx);
1015 return ret;
1016 }
1017
1018 static ssize_t ucma_disconnect(struct ucma_file *file, const char __user *inbuf,
1019 int in_len, int out_len)
1020 {
1021 struct rdma_ucm_disconnect cmd;
1022 struct ucma_context *ctx;
1023 int ret;
1024
1025 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1026 return -EFAULT;
1027
1028 ctx = ucma_get_ctx(file, cmd.id);
1029 if (IS_ERR(ctx))
1030 return PTR_ERR(ctx);
1031
1032 ret = rdma_disconnect(ctx->cm_id);
1033 ucma_put_ctx(ctx);
1034 return ret;
1035 }
1036
1037 static ssize_t ucma_init_qp_attr(struct ucma_file *file,
1038 const char __user *inbuf,
1039 int in_len, int out_len)
1040 {
1041 struct rdma_ucm_init_qp_attr cmd;
1042 struct ib_uverbs_qp_attr resp;
1043 struct ucma_context *ctx;
1044 struct ib_qp_attr qp_attr;
1045 int ret;
1046
1047 if (out_len < sizeof(resp))
1048 return -ENOSPC;
1049
1050 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1051 return -EFAULT;
1052
1053 ctx = ucma_get_ctx(file, cmd.id);
1054 if (IS_ERR(ctx))
1055 return PTR_ERR(ctx);
1056
1057 resp.qp_attr_mask = 0;
1058 memset(&qp_attr, 0, sizeof qp_attr);
1059 qp_attr.qp_state = cmd.qp_state;
1060 ret = rdma_init_qp_attr(ctx->cm_id, &qp_attr, &resp.qp_attr_mask);
1061 if (ret)
1062 goto out;
1063
1064 ib_copy_qp_attr_to_user(&resp, &qp_attr);
1065 if (copy_to_user((void __user *)(unsigned long)cmd.response,
1066 &resp, sizeof(resp)))
1067 ret = -EFAULT;
1068
1069 out:
1070 ucma_put_ctx(ctx);
1071 return ret;
1072 }
1073
1074 static int ucma_set_option_id(struct ucma_context *ctx, int optname,
1075 void *optval, size_t optlen)
1076 {
1077 int ret = 0;
1078
1079 switch (optname) {
1080 case RDMA_OPTION_ID_TOS:
1081 if (optlen != sizeof(u8)) {
1082 ret = -EINVAL;
1083 break;
1084 }
1085 rdma_set_service_type(ctx->cm_id, *((u8 *) optval));
1086 break;
1087 case RDMA_OPTION_ID_REUSEADDR:
1088 if (optlen != sizeof(int)) {
1089 ret = -EINVAL;
1090 break;
1091 }
1092 ret = rdma_set_reuseaddr(ctx->cm_id, *((int *) optval) ? 1 : 0);
1093 break;
1094 case RDMA_OPTION_ID_AFONLY:
1095 if (optlen != sizeof(int)) {
1096 ret = -EINVAL;
1097 break;
1098 }
1099 ret = rdma_set_afonly(ctx->cm_id, *((int *) optval) ? 1 : 0);
1100 break;
1101 default:
1102 ret = -ENOSYS;
1103 }
1104
1105 return ret;
1106 }
1107
1108 static int ucma_set_ib_path(struct ucma_context *ctx,
1109 struct ib_path_rec_data *path_data, size_t optlen)
1110 {
1111 struct ib_sa_path_rec sa_path;
1112 struct rdma_cm_event event;
1113 int ret;
1114
1115 if (optlen % sizeof(*path_data))
1116 return -EINVAL;
1117
1118 for (; optlen; optlen -= sizeof(*path_data), path_data++) {
1119 if (path_data->flags == (IB_PATH_GMP | IB_PATH_PRIMARY |
1120 IB_PATH_BIDIRECTIONAL))
1121 break;
1122 }
1123
1124 if (!optlen)
1125 return -EINVAL;
1126
1127 ib_sa_unpack_path(path_data->path_rec, &sa_path);
1128 ret = rdma_set_ib_paths(ctx->cm_id, &sa_path, 1);
1129 if (ret)
1130 return ret;
1131
1132 memset(&event, 0, sizeof event);
1133 event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
1134 return ucma_event_handler(ctx->cm_id, &event);
1135 }
1136
1137 static int ucma_set_option_ib(struct ucma_context *ctx, int optname,
1138 void *optval, size_t optlen)
1139 {
1140 int ret;
1141
1142 switch (optname) {
1143 case RDMA_OPTION_IB_PATH:
1144 ret = ucma_set_ib_path(ctx, optval, optlen);
1145 break;
1146 default:
1147 ret = -ENOSYS;
1148 }
1149
1150 return ret;
1151 }
1152
1153 static int ucma_set_option_level(struct ucma_context *ctx, int level,
1154 int optname, void *optval, size_t optlen)
1155 {
1156 int ret;
1157
1158 switch (level) {
1159 case RDMA_OPTION_ID:
1160 ret = ucma_set_option_id(ctx, optname, optval, optlen);
1161 break;
1162 case RDMA_OPTION_IB:
1163 ret = ucma_set_option_ib(ctx, optname, optval, optlen);
1164 break;
1165 default:
1166 ret = -ENOSYS;
1167 }
1168
1169 return ret;
1170 }
1171
1172 static ssize_t ucma_set_option(struct ucma_file *file, const char __user *inbuf,
1173 int in_len, int out_len)
1174 {
1175 struct rdma_ucm_set_option cmd;
1176 struct ucma_context *ctx;
1177 void *optval;
1178 int ret;
1179
1180 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1181 return -EFAULT;
1182
1183 ctx = ucma_get_ctx(file, cmd.id);
1184 if (IS_ERR(ctx))
1185 return PTR_ERR(ctx);
1186
1187 optval = memdup_user((void __user *) (unsigned long) cmd.optval,
1188 cmd.optlen);
1189 if (IS_ERR(optval)) {
1190 ret = PTR_ERR(optval);
1191 goto out;
1192 }
1193
1194 ret = ucma_set_option_level(ctx, cmd.level, cmd.optname, optval,
1195 cmd.optlen);
1196 kfree(optval);
1197
1198 out:
1199 ucma_put_ctx(ctx);
1200 return ret;
1201 }
1202
1203 static ssize_t ucma_notify(struct ucma_file *file, const char __user *inbuf,
1204 int in_len, int out_len)
1205 {
1206 struct rdma_ucm_notify cmd;
1207 struct ucma_context *ctx;
1208 int ret;
1209
1210 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1211 return -EFAULT;
1212
1213 ctx = ucma_get_ctx(file, cmd.id);
1214 if (IS_ERR(ctx))
1215 return PTR_ERR(ctx);
1216
1217 ret = rdma_notify(ctx->cm_id, (enum ib_event_type) cmd.event);
1218 ucma_put_ctx(ctx);
1219 return ret;
1220 }
1221
1222 static ssize_t ucma_process_join(struct ucma_file *file,
1223 struct rdma_ucm_join_mcast *cmd, int out_len)
1224 {
1225 struct rdma_ucm_create_id_resp resp;
1226 struct ucma_context *ctx;
1227 struct ucma_multicast *mc;
1228 struct sockaddr *addr;
1229 int ret;
1230
1231 if (out_len < sizeof(resp))
1232 return -ENOSPC;
1233
1234 addr = (struct sockaddr *) &cmd->addr;
1235 if (cmd->reserved || !cmd->addr_size || (cmd->addr_size != rdma_addr_size(addr)))
1236 return -EINVAL;
1237
1238 ctx = ucma_get_ctx(file, cmd->id);
1239 if (IS_ERR(ctx))
1240 return PTR_ERR(ctx);
1241
1242 mutex_lock(&file->mut);
1243 mc = ucma_alloc_multicast(ctx);
1244 if (!mc) {
1245 ret = -ENOMEM;
1246 goto err1;
1247 }
1248
1249 mc->uid = cmd->uid;
1250 memcpy(&mc->addr, addr, cmd->addr_size);
1251 ret = rdma_join_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr, mc);
1252 if (ret)
1253 goto err2;
1254
1255 resp.id = mc->id;
1256 if (copy_to_user((void __user *)(unsigned long) cmd->response,
1257 &resp, sizeof(resp))) {
1258 ret = -EFAULT;
1259 goto err3;
1260 }
1261
1262 mutex_unlock(&file->mut);
1263 ucma_put_ctx(ctx);
1264 return 0;
1265
1266 err3:
1267 rdma_leave_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr);
1268 ucma_cleanup_mc_events(mc);
1269 err2:
1270 mutex_lock(&mut);
1271 idr_remove(&multicast_idr, mc->id);
1272 mutex_unlock(&mut);
1273 list_del(&mc->list);
1274 kfree(mc);
1275 err1:
1276 mutex_unlock(&file->mut);
1277 ucma_put_ctx(ctx);
1278 return ret;
1279 }
1280
1281 static ssize_t ucma_join_ip_multicast(struct ucma_file *file,
1282 const char __user *inbuf,
1283 int in_len, int out_len)
1284 {
1285 struct rdma_ucm_join_ip_mcast cmd;
1286 struct rdma_ucm_join_mcast join_cmd;
1287
1288 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1289 return -EFAULT;
1290
1291 join_cmd.response = cmd.response;
1292 join_cmd.uid = cmd.uid;
1293 join_cmd.id = cmd.id;
1294 join_cmd.addr_size = rdma_addr_size((struct sockaddr *) &cmd.addr);
1295 join_cmd.reserved = 0;
1296 memcpy(&join_cmd.addr, &cmd.addr, join_cmd.addr_size);
1297
1298 return ucma_process_join(file, &join_cmd, out_len);
1299 }
1300
1301 static ssize_t ucma_join_multicast(struct ucma_file *file,
1302 const char __user *inbuf,
1303 int in_len, int out_len)
1304 {
1305 struct rdma_ucm_join_mcast cmd;
1306
1307 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1308 return -EFAULT;
1309
1310 return ucma_process_join(file, &cmd, out_len);
1311 }
1312
1313 static ssize_t ucma_leave_multicast(struct ucma_file *file,
1314 const char __user *inbuf,
1315 int in_len, int out_len)
1316 {
1317 struct rdma_ucm_destroy_id cmd;
1318 struct rdma_ucm_destroy_id_resp resp;
1319 struct ucma_multicast *mc;
1320 int ret = 0;
1321
1322 if (out_len < sizeof(resp))
1323 return -ENOSPC;
1324
1325 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1326 return -EFAULT;
1327
1328 mutex_lock(&mut);
1329 mc = idr_find(&multicast_idr, cmd.id);
1330 if (!mc)
1331 mc = ERR_PTR(-ENOENT);
1332 else if (mc->ctx->file != file)
1333 mc = ERR_PTR(-EINVAL);
1334 else {
1335 idr_remove(&multicast_idr, mc->id);
1336 atomic_inc(&mc->ctx->ref);
1337 }
1338 mutex_unlock(&mut);
1339
1340 if (IS_ERR(mc)) {
1341 ret = PTR_ERR(mc);
1342 goto out;
1343 }
1344
1345 rdma_leave_multicast(mc->ctx->cm_id, (struct sockaddr *) &mc->addr);
1346 mutex_lock(&mc->ctx->file->mut);
1347 ucma_cleanup_mc_events(mc);
1348 list_del(&mc->list);
1349 mutex_unlock(&mc->ctx->file->mut);
1350
1351 ucma_put_ctx(mc->ctx);
1352 resp.events_reported = mc->events_reported;
1353 kfree(mc);
1354
1355 if (copy_to_user((void __user *)(unsigned long)cmd.response,
1356 &resp, sizeof(resp)))
1357 ret = -EFAULT;
1358 out:
1359 return ret;
1360 }
1361
1362 static void ucma_lock_files(struct ucma_file *file1, struct ucma_file *file2)
1363 {
1364 /* Acquire mutex's based on pointer comparison to prevent deadlock. */
1365 if (file1 < file2) {
1366 mutex_lock(&file1->mut);
1367 mutex_lock(&file2->mut);
1368 } else {
1369 mutex_lock(&file2->mut);
1370 mutex_lock(&file1->mut);
1371 }
1372 }
1373
1374 static void ucma_unlock_files(struct ucma_file *file1, struct ucma_file *file2)
1375 {
1376 if (file1 < file2) {
1377 mutex_unlock(&file2->mut);
1378 mutex_unlock(&file1->mut);
1379 } else {
1380 mutex_unlock(&file1->mut);
1381 mutex_unlock(&file2->mut);
1382 }
1383 }
1384
1385 static void ucma_move_events(struct ucma_context *ctx, struct ucma_file *file)
1386 {
1387 struct ucma_event *uevent, *tmp;
1388
1389 list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list)
1390 if (uevent->ctx == ctx)
1391 list_move_tail(&uevent->list, &file->event_list);
1392 }
1393
1394 static ssize_t ucma_migrate_id(struct ucma_file *new_file,
1395 const char __user *inbuf,
1396 int in_len, int out_len)
1397 {
1398 struct rdma_ucm_migrate_id cmd;
1399 struct rdma_ucm_migrate_resp resp;
1400 struct ucma_context *ctx;
1401 struct fd f;
1402 struct ucma_file *cur_file;
1403 int ret = 0;
1404
1405 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1406 return -EFAULT;
1407
1408 /* Get current fd to protect against it being closed */
1409 f = fdget(cmd.fd);
1410 if (!f.file)
1411 return -ENOENT;
1412
1413 /* Validate current fd and prevent destruction of id. */
1414 ctx = ucma_get_ctx(f.file->private_data, cmd.id);
1415 if (IS_ERR(ctx)) {
1416 ret = PTR_ERR(ctx);
1417 goto file_put;
1418 }
1419
1420 cur_file = ctx->file;
1421 if (cur_file == new_file) {
1422 resp.events_reported = ctx->events_reported;
1423 goto response;
1424 }
1425
1426 /*
1427 * Migrate events between fd's, maintaining order, and avoiding new
1428 * events being added before existing events.
1429 */
1430 ucma_lock_files(cur_file, new_file);
1431 mutex_lock(&mut);
1432
1433 list_move_tail(&ctx->list, &new_file->ctx_list);
1434 ucma_move_events(ctx, new_file);
1435 ctx->file = new_file;
1436 resp.events_reported = ctx->events_reported;
1437
1438 mutex_unlock(&mut);
1439 ucma_unlock_files(cur_file, new_file);
1440
1441 response:
1442 if (copy_to_user((void __user *)(unsigned long)cmd.response,
1443 &resp, sizeof(resp)))
1444 ret = -EFAULT;
1445
1446 ucma_put_ctx(ctx);
1447 file_put:
1448 fdput(f);
1449 return ret;
1450 }
1451
1452 static ssize_t (*ucma_cmd_table[])(struct ucma_file *file,
1453 const char __user *inbuf,
1454 int in_len, int out_len) = {
1455 [RDMA_USER_CM_CMD_CREATE_ID] = ucma_create_id,
1456 [RDMA_USER_CM_CMD_DESTROY_ID] = ucma_destroy_id,
1457 [RDMA_USER_CM_CMD_BIND_IP] = ucma_bind_ip,
1458 [RDMA_USER_CM_CMD_RESOLVE_IP] = ucma_resolve_ip,
1459 [RDMA_USER_CM_CMD_RESOLVE_ROUTE] = ucma_resolve_route,
1460 [RDMA_USER_CM_CMD_QUERY_ROUTE] = ucma_query_route,
1461 [RDMA_USER_CM_CMD_CONNECT] = ucma_connect,
1462 [RDMA_USER_CM_CMD_LISTEN] = ucma_listen,
1463 [RDMA_USER_CM_CMD_ACCEPT] = ucma_accept,
1464 [RDMA_USER_CM_CMD_REJECT] = ucma_reject,
1465 [RDMA_USER_CM_CMD_DISCONNECT] = ucma_disconnect,
1466 [RDMA_USER_CM_CMD_INIT_QP_ATTR] = ucma_init_qp_attr,
1467 [RDMA_USER_CM_CMD_GET_EVENT] = ucma_get_event,
1468 [RDMA_USER_CM_CMD_GET_OPTION] = NULL,
1469 [RDMA_USER_CM_CMD_SET_OPTION] = ucma_set_option,
1470 [RDMA_USER_CM_CMD_NOTIFY] = ucma_notify,
1471 [RDMA_USER_CM_CMD_JOIN_IP_MCAST] = ucma_join_ip_multicast,
1472 [RDMA_USER_CM_CMD_LEAVE_MCAST] = ucma_leave_multicast,
1473 [RDMA_USER_CM_CMD_MIGRATE_ID] = ucma_migrate_id,
1474 [RDMA_USER_CM_CMD_QUERY] = ucma_query,
1475 [RDMA_USER_CM_CMD_BIND] = ucma_bind,
1476 [RDMA_USER_CM_CMD_RESOLVE_ADDR] = ucma_resolve_addr,
1477 [RDMA_USER_CM_CMD_JOIN_MCAST] = ucma_join_multicast
1478 };
1479
1480 static ssize_t ucma_write(struct file *filp, const char __user *buf,
1481 size_t len, loff_t *pos)
1482 {
1483 struct ucma_file *file = filp->private_data;
1484 struct rdma_ucm_cmd_hdr hdr;
1485 ssize_t ret;
1486
1487 if (len < sizeof(hdr))
1488 return -EINVAL;
1489
1490 if (copy_from_user(&hdr, buf, sizeof(hdr)))
1491 return -EFAULT;
1492
1493 if (hdr.cmd >= ARRAY_SIZE(ucma_cmd_table))
1494 return -EINVAL;
1495
1496 if (hdr.in + sizeof(hdr) > len)
1497 return -EINVAL;
1498
1499 if (!ucma_cmd_table[hdr.cmd])
1500 return -ENOSYS;
1501
1502 ret = ucma_cmd_table[hdr.cmd](file, buf + sizeof(hdr), hdr.in, hdr.out);
1503 if (!ret)
1504 ret = len;
1505
1506 return ret;
1507 }
1508
1509 static unsigned int ucma_poll(struct file *filp, struct poll_table_struct *wait)
1510 {
1511 struct ucma_file *file = filp->private_data;
1512 unsigned int mask = 0;
1513
1514 poll_wait(filp, &file->poll_wait, wait);
1515
1516 if (!list_empty(&file->event_list))
1517 mask = POLLIN | POLLRDNORM;
1518
1519 return mask;
1520 }
1521
1522 /*
1523 * ucma_open() does not need the BKL:
1524 *
1525 * - no global state is referred to;
1526 * - there is no ioctl method to race against;
1527 * - no further module initialization is required for open to work
1528 * after the device is registered.
1529 */
1530 static int ucma_open(struct inode *inode, struct file *filp)
1531 {
1532 struct ucma_file *file;
1533
1534 file = kmalloc(sizeof *file, GFP_KERNEL);
1535 if (!file)
1536 return -ENOMEM;
1537
1538 INIT_LIST_HEAD(&file->event_list);
1539 INIT_LIST_HEAD(&file->ctx_list);
1540 init_waitqueue_head(&file->poll_wait);
1541 mutex_init(&file->mut);
1542
1543 filp->private_data = file;
1544 file->filp = filp;
1545
1546 return nonseekable_open(inode, filp);
1547 }
1548
1549 static int ucma_close(struct inode *inode, struct file *filp)
1550 {
1551 struct ucma_file *file = filp->private_data;
1552 struct ucma_context *ctx, *tmp;
1553
1554 mutex_lock(&file->mut);
1555 list_for_each_entry_safe(ctx, tmp, &file->ctx_list, list) {
1556 mutex_unlock(&file->mut);
1557
1558 mutex_lock(&mut);
1559 idr_remove(&ctx_idr, ctx->id);
1560 mutex_unlock(&mut);
1561
1562 ucma_free_ctx(ctx);
1563 mutex_lock(&file->mut);
1564 }
1565 mutex_unlock(&file->mut);
1566 kfree(file);
1567 return 0;
1568 }
1569
1570 static const struct file_operations ucma_fops = {
1571 .owner = THIS_MODULE,
1572 .open = ucma_open,
1573 .release = ucma_close,
1574 .write = ucma_write,
1575 .poll = ucma_poll,
1576 .llseek = no_llseek,
1577 };
1578
1579 static struct miscdevice ucma_misc = {
1580 .minor = MISC_DYNAMIC_MINOR,
1581 .name = "rdma_cm",
1582 .nodename = "infiniband/rdma_cm",
1583 .mode = 0666,
1584 .fops = &ucma_fops,
1585 };
1586
1587 static ssize_t show_abi_version(struct device *dev,
1588 struct device_attribute *attr,
1589 char *buf)
1590 {
1591 return sprintf(buf, "%d\n", RDMA_USER_CM_ABI_VERSION);
1592 }
1593 static DEVICE_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
1594
1595 static int __init ucma_init(void)
1596 {
1597 int ret;
1598
1599 ret = misc_register(&ucma_misc);
1600 if (ret)
1601 return ret;
1602
1603 ret = device_create_file(ucma_misc.this_device, &dev_attr_abi_version);
1604 if (ret) {
1605 printk(KERN_ERR "rdma_ucm: couldn't create abi_version attr\n");
1606 goto err1;
1607 }
1608
1609 ucma_ctl_table_hdr = register_net_sysctl(&init_net, "net/rdma_ucm", ucma_ctl_table);
1610 if (!ucma_ctl_table_hdr) {
1611 printk(KERN_ERR "rdma_ucm: couldn't register sysctl paths\n");
1612 ret = -ENOMEM;
1613 goto err2;
1614 }
1615 return 0;
1616 err2:
1617 device_remove_file(ucma_misc.this_device, &dev_attr_abi_version);
1618 err1:
1619 misc_deregister(&ucma_misc);
1620 return ret;
1621 }
1622
1623 static void __exit ucma_cleanup(void)
1624 {
1625 unregister_net_sysctl_table(ucma_ctl_table_hdr);
1626 device_remove_file(ucma_misc.this_device, &dev_attr_abi_version);
1627 misc_deregister(&ucma_misc);
1628 idr_destroy(&ctx_idr);
1629 }
1630
1631 module_init(ucma_init);
1632 module_exit(ucma_cleanup);
Linux with added FPC-III support