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USB: serial: fix whitespace issues
[zen-stable.git] / drivers / infiniband / core / ucma.c
blobb37b0c02a7b9d7d81cd5a55471e28d2780080377
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
51 MODULE_AUTHOR("Sean Hefty");
52 MODULE_DESCRIPTION("RDMA Userspace Connection Manager Access");
53 MODULE_LICENSE("Dual BSD/GPL");
54
55 static unsigned int max_backlog = 1024;
56
57 static struct ctl_table_header *ucma_ctl_table_hdr;
58 static ctl_table ucma_ctl_table[] = {
59 {
60 .procname = "max_backlog",
61 .data = &max_backlog,
62 .maxlen = sizeof max_backlog,
63 .mode = 0644,
64 .proc_handler = proc_dointvec,
65 },
66 { }
67 };
68
69 static struct ctl_path ucma_ctl_path[] = {
70 { .procname = "net" },
71 { .procname = "rdma_ucm" },
72 { }
73 };
74
75 struct ucma_file {
76 struct mutex mut;
77 struct file *filp;
78 struct list_head ctx_list;
79 struct list_head event_list;
80 wait_queue_head_t poll_wait;
81 };
82
83 struct ucma_context {
84 int id;
85 struct completion comp;
86 atomic_t ref;
87 int events_reported;
88 int backlog;
89
90 struct ucma_file *file;
91 struct rdma_cm_id *cm_id;
92 u64 uid;
93
94 struct list_head list;
95 struct list_head mc_list;
96 };
97
98 struct ucma_multicast {
99 struct ucma_context *ctx;
100 int id;
101 int events_reported;
102
103 u64 uid;
104 struct list_head list;
105 struct sockaddr_storage addr;
106 };
107
108 struct ucma_event {
109 struct ucma_context *ctx;
110 struct ucma_multicast *mc;
111 struct list_head list;
112 struct rdma_cm_id *cm_id;
113 struct rdma_ucm_event_resp resp;
114 };
115
116 static DEFINE_MUTEX(mut);
117 static DEFINE_IDR(ctx_idr);
118 static DEFINE_IDR(multicast_idr);
119
120 static inline struct ucma_context *_ucma_find_context(int id,
121 struct ucma_file *file)
122 {
123 struct ucma_context *ctx;
124
125 ctx = idr_find(&ctx_idr, id);
126 if (!ctx)
127 ctx = ERR_PTR(-ENOENT);
128 else if (ctx->file != file)
129 ctx = ERR_PTR(-EINVAL);
130 return ctx;
131 }
132
133 static struct ucma_context *ucma_get_ctx(struct ucma_file *file, int id)
134 {
135 struct ucma_context *ctx;
136
137 mutex_lock(&mut);
138 ctx = _ucma_find_context(id, file);
139 if (!IS_ERR(ctx))
140 atomic_inc(&ctx->ref);
141 mutex_unlock(&mut);
142 return ctx;
143 }
144
145 static void ucma_put_ctx(struct ucma_context *ctx)
146 {
147 if (atomic_dec_and_test(&ctx->ref))
148 complete(&ctx->comp);
149 }
150
151 static struct ucma_context *ucma_alloc_ctx(struct ucma_file *file)
152 {
153 struct ucma_context *ctx;
154 int ret;
155
156 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
157 if (!ctx)
158 return NULL;
159
160 atomic_set(&ctx->ref, 1);
161 init_completion(&ctx->comp);
162 INIT_LIST_HEAD(&ctx->mc_list);
163 ctx->file = file;
164
165 do {
166 ret = idr_pre_get(&ctx_idr, GFP_KERNEL);
167 if (!ret)
168 goto error;
169
170 mutex_lock(&mut);
171 ret = idr_get_new(&ctx_idr, ctx, &ctx->id);
172 mutex_unlock(&mut);
173 } while (ret == -EAGAIN);
174
175 if (ret)
176 goto error;
177
178 list_add_tail(&ctx->list, &file->ctx_list);
179 return ctx;
180
181 error:
182 kfree(ctx);
183 return NULL;
184 }
185
186 static struct ucma_multicast* ucma_alloc_multicast(struct ucma_context *ctx)
187 {
188 struct ucma_multicast *mc;
189 int ret;
190
191 mc = kzalloc(sizeof(*mc), GFP_KERNEL);
192 if (!mc)
193 return NULL;
194
195 do {
196 ret = idr_pre_get(&multicast_idr, GFP_KERNEL);
197 if (!ret)
198 goto error;
199
200 mutex_lock(&mut);
201 ret = idr_get_new(&multicast_idr, mc, &mc->id);
202 mutex_unlock(&mut);
203 } while (ret == -EAGAIN);
204
205 if (ret)
206 goto error;
207
208 mc->ctx = ctx;
209 list_add_tail(&mc->list, &ctx->mc_list);
210 return mc;
211
212 error:
213 kfree(mc);
214 return NULL;
215 }
216
217 static void ucma_copy_conn_event(struct rdma_ucm_conn_param *dst,
218 struct rdma_conn_param *src)
219 {
220 if (src->private_data_len)
221 memcpy(dst->private_data, src->private_data,
222 src->private_data_len);
223 dst->private_data_len = src->private_data_len;
224 dst->responder_resources =src->responder_resources;
225 dst->initiator_depth = src->initiator_depth;
226 dst->flow_control = src->flow_control;
227 dst->retry_count = src->retry_count;
228 dst->rnr_retry_count = src->rnr_retry_count;
229 dst->srq = src->srq;
230 dst->qp_num = src->qp_num;
231 }
232
233 static void ucma_copy_ud_event(struct rdma_ucm_ud_param *dst,
234 struct rdma_ud_param *src)
235 {
236 if (src->private_data_len)
237 memcpy(dst->private_data, src->private_data,
238 src->private_data_len);
239 dst->private_data_len = src->private_data_len;
240 ib_copy_ah_attr_to_user(&dst->ah_attr, &src->ah_attr);
241 dst->qp_num = src->qp_num;
242 dst->qkey = src->qkey;
243 }
244
245 static void ucma_set_event_context(struct ucma_context *ctx,
246 struct rdma_cm_event *event,
247 struct ucma_event *uevent)
248 {
249 uevent->ctx = ctx;
250 switch (event->event) {
251 case RDMA_CM_EVENT_MULTICAST_JOIN:
252 case RDMA_CM_EVENT_MULTICAST_ERROR:
253 uevent->mc = (struct ucma_multicast *)
254 event->param.ud.private_data;
255 uevent->resp.uid = uevent->mc->uid;
256 uevent->resp.id = uevent->mc->id;
257 break;
258 default:
259 uevent->resp.uid = ctx->uid;
260 uevent->resp.id = ctx->id;
261 break;
262 }
263 }
264
265 static int ucma_event_handler(struct rdma_cm_id *cm_id,
266 struct rdma_cm_event *event)
267 {
268 struct ucma_event *uevent;
269 struct ucma_context *ctx = cm_id->context;
270 int ret = 0;
271
272 uevent = kzalloc(sizeof(*uevent), GFP_KERNEL);
273 if (!uevent)
274 return event->event == RDMA_CM_EVENT_CONNECT_REQUEST;
275
276 uevent->cm_id = cm_id;
277 ucma_set_event_context(ctx, event, uevent);
278 uevent->resp.event = event->event;
279 uevent->resp.status = event->status;
280 if (cm_id->qp_type == IB_QPT_UD)
281 ucma_copy_ud_event(&uevent->resp.param.ud, &event->param.ud);
282 else
283 ucma_copy_conn_event(&uevent->resp.param.conn,
284 &event->param.conn);
285
286 mutex_lock(&ctx->file->mut);
287 if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST) {
288 if (!ctx->backlog) {
289 ret = -ENOMEM;
290 kfree(uevent);
291 goto out;
292 }
293 ctx->backlog--;
294 } else if (!ctx->uid) {
295 /*
296 * We ignore events for new connections until userspace has set
297 * their context. This can only happen if an error occurs on a
298 * new connection before the user accepts it. This is okay,
299 * since the accept will just fail later.
300 */
301 kfree(uevent);
302 goto out;
303 }
304
305 list_add_tail(&uevent->list, &ctx->file->event_list);
306 wake_up_interruptible(&ctx->file->poll_wait);
307 out:
308 mutex_unlock(&ctx->file->mut);
309 return ret;
310 }
311
312 static ssize_t ucma_get_event(struct ucma_file *file, const char __user *inbuf,
313 int in_len, int out_len)
314 {
315 struct ucma_context *ctx;
316 struct rdma_ucm_get_event cmd;
317 struct ucma_event *uevent;
318 int ret = 0;
319 DEFINE_WAIT(wait);
320
321 if (out_len < sizeof uevent->resp)
322 return -ENOSPC;
323
324 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
325 return -EFAULT;
326
327 mutex_lock(&file->mut);
328 while (list_empty(&file->event_list)) {
329 mutex_unlock(&file->mut);
330
331 if (file->filp->f_flags & O_NONBLOCK)
332 return -EAGAIN;
333
334 if (wait_event_interruptible(file->poll_wait,
335 !list_empty(&file->event_list)))
336 return -ERESTARTSYS;
337
338 mutex_lock(&file->mut);
339 }
340
341 uevent = list_entry(file->event_list.next, struct ucma_event, list);
342
343 if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST) {
344 ctx = ucma_alloc_ctx(file);
345 if (!ctx) {
346 ret = -ENOMEM;
347 goto done;
348 }
349 uevent->ctx->backlog++;
350 ctx->cm_id = uevent->cm_id;
351 ctx->cm_id->context = ctx;
352 uevent->resp.id = ctx->id;
353 }
354
355 if (copy_to_user((void __user *)(unsigned long)cmd.response,
356 &uevent->resp, sizeof uevent->resp)) {
357 ret = -EFAULT;
358 goto done;
359 }
360
361 list_del(&uevent->list);
362 uevent->ctx->events_reported++;
363 if (uevent->mc)
364 uevent->mc->events_reported++;
365 kfree(uevent);
366 done:
367 mutex_unlock(&file->mut);
368 return ret;
369 }
370
371 static int ucma_get_qp_type(struct rdma_ucm_create_id *cmd, enum ib_qp_type *qp_type)
372 {
373 switch (cmd->ps) {
374 case RDMA_PS_TCP:
375 *qp_type = IB_QPT_RC;
376 return 0;
377 case RDMA_PS_UDP:
378 case RDMA_PS_IPOIB:
379 *qp_type = IB_QPT_UD;
380 return 0;
381 case RDMA_PS_IB:
382 *qp_type = cmd->qp_type;
383 return 0;
384 default:
385 return -EINVAL;
386 }
387 }
388
389 static ssize_t ucma_create_id(struct ucma_file *file, const char __user *inbuf,
390 int in_len, int out_len)
391 {
392 struct rdma_ucm_create_id cmd;
393 struct rdma_ucm_create_id_resp resp;
394 struct ucma_context *ctx;
395 enum ib_qp_type qp_type;
396 int ret;
397
398 if (out_len < sizeof(resp))
399 return -ENOSPC;
400
401 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
402 return -EFAULT;
403
404 ret = ucma_get_qp_type(&cmd, &qp_type);
405 if (ret)
406 return ret;
407
408 mutex_lock(&file->mut);
409 ctx = ucma_alloc_ctx(file);
410 mutex_unlock(&file->mut);
411 if (!ctx)
412 return -ENOMEM;
413
414 ctx->uid = cmd.uid;
415 ctx->cm_id = rdma_create_id(ucma_event_handler, ctx, cmd.ps, qp_type);
416 if (IS_ERR(ctx->cm_id)) {
417 ret = PTR_ERR(ctx->cm_id);
418 goto err1;
419 }
420
421 resp.id = ctx->id;
422 if (copy_to_user((void __user *)(unsigned long)cmd.response,
423 &resp, sizeof(resp))) {
424 ret = -EFAULT;
425 goto err2;
426 }
427 return 0;
428
429 err2:
430 rdma_destroy_id(ctx->cm_id);
431 err1:
432 mutex_lock(&mut);
433 idr_remove(&ctx_idr, ctx->id);
434 mutex_unlock(&mut);
435 kfree(ctx);
436 return ret;
437 }
438
439 static void ucma_cleanup_multicast(struct ucma_context *ctx)
440 {
441 struct ucma_multicast *mc, *tmp;
442
443 mutex_lock(&mut);
444 list_for_each_entry_safe(mc, tmp, &ctx->mc_list, list) {
445 list_del(&mc->list);
446 idr_remove(&multicast_idr, mc->id);
447 kfree(mc);
448 }
449 mutex_unlock(&mut);
450 }
451
452 static void ucma_cleanup_events(struct ucma_context *ctx)
453 {
454 struct ucma_event *uevent, *tmp;
455
456 list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list) {
457 if (uevent->ctx != ctx)
458 continue;
459
460 list_del(&uevent->list);
461
462 /* clear incoming connections. */
463 if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST)
464 rdma_destroy_id(uevent->cm_id);
465
466 kfree(uevent);
467 }
468 }
469
470 static void ucma_cleanup_mc_events(struct ucma_multicast *mc)
471 {
472 struct ucma_event *uevent, *tmp;
473
474 list_for_each_entry_safe(uevent, tmp, &mc->ctx->file->event_list, list) {
475 if (uevent->mc != mc)
476 continue;
477
478 list_del(&uevent->list);
479 kfree(uevent);
480 }
481 }
482
483 static int ucma_free_ctx(struct ucma_context *ctx)
484 {
485 int events_reported;
486
487 /* No new events will be generated after destroying the id. */
488 rdma_destroy_id(ctx->cm_id);
489
490 ucma_cleanup_multicast(ctx);
491
492 /* Cleanup events not yet reported to the user. */
493 mutex_lock(&ctx->file->mut);
494 ucma_cleanup_events(ctx);
495 list_del(&ctx->list);
496 mutex_unlock(&ctx->file->mut);
497
498 events_reported = ctx->events_reported;
499 kfree(ctx);
500 return events_reported;
501 }
502
503 static ssize_t ucma_destroy_id(struct ucma_file *file, const char __user *inbuf,
504 int in_len, int out_len)
505 {
506 struct rdma_ucm_destroy_id cmd;
507 struct rdma_ucm_destroy_id_resp resp;
508 struct ucma_context *ctx;
509 int ret = 0;
510
511 if (out_len < sizeof(resp))
512 return -ENOSPC;
513
514 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
515 return -EFAULT;
516
517 mutex_lock(&mut);
518 ctx = _ucma_find_context(cmd.id, file);
519 if (!IS_ERR(ctx))
520 idr_remove(&ctx_idr, ctx->id);
521 mutex_unlock(&mut);
522
523 if (IS_ERR(ctx))
524 return PTR_ERR(ctx);
525
526 ucma_put_ctx(ctx);
527 wait_for_completion(&ctx->comp);
528 resp.events_reported = ucma_free_ctx(ctx);
529
530 if (copy_to_user((void __user *)(unsigned long)cmd.response,
531 &resp, sizeof(resp)))
532 ret = -EFAULT;
533
534 return ret;
535 }
536
537 static ssize_t ucma_bind_addr(struct ucma_file *file, const char __user *inbuf,
538 int in_len, int out_len)
539 {
540 struct rdma_ucm_bind_addr cmd;
541 struct ucma_context *ctx;
542 int ret;
543
544 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
545 return -EFAULT;
546
547 ctx = ucma_get_ctx(file, cmd.id);
548 if (IS_ERR(ctx))
549 return PTR_ERR(ctx);
550
551 ret = rdma_bind_addr(ctx->cm_id, (struct sockaddr *) &cmd.addr);
552 ucma_put_ctx(ctx);
553 return ret;
554 }
555
556 static ssize_t ucma_resolve_addr(struct ucma_file *file,
557 const char __user *inbuf,
558 int in_len, int out_len)
559 {
560 struct rdma_ucm_resolve_addr cmd;
561 struct ucma_context *ctx;
562 int ret;
563
564 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
565 return -EFAULT;
566
567 ctx = ucma_get_ctx(file, cmd.id);
568 if (IS_ERR(ctx))
569 return PTR_ERR(ctx);
570
571 ret = rdma_resolve_addr(ctx->cm_id, (struct sockaddr *) &cmd.src_addr,
572 (struct sockaddr *) &cmd.dst_addr,
573 cmd.timeout_ms);
574 ucma_put_ctx(ctx);
575 return ret;
576 }
577
578 static ssize_t ucma_resolve_route(struct ucma_file *file,
579 const char __user *inbuf,
580 int in_len, int out_len)
581 {
582 struct rdma_ucm_resolve_route cmd;
583 struct ucma_context *ctx;
584 int ret;
585
586 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
587 return -EFAULT;
588
589 ctx = ucma_get_ctx(file, cmd.id);
590 if (IS_ERR(ctx))
591 return PTR_ERR(ctx);
592
593 ret = rdma_resolve_route(ctx->cm_id, cmd.timeout_ms);
594 ucma_put_ctx(ctx);
595 return ret;
596 }
597
598 static void ucma_copy_ib_route(struct rdma_ucm_query_route_resp *resp,
599 struct rdma_route *route)
600 {
601 struct rdma_dev_addr *dev_addr;
602
603 resp->num_paths = route->num_paths;
604 switch (route->num_paths) {
605 case 0:
606 dev_addr = &route->addr.dev_addr;
607 rdma_addr_get_dgid(dev_addr,
608 (union ib_gid *) &resp->ib_route[0].dgid);
609 rdma_addr_get_sgid(dev_addr,
610 (union ib_gid *) &resp->ib_route[0].sgid);
611 resp->ib_route[0].pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
612 break;
613 case 2:
614 ib_copy_path_rec_to_user(&resp->ib_route[1],
615 &route->path_rec[1]);
616 /* fall through */
617 case 1:
618 ib_copy_path_rec_to_user(&resp->ib_route[0],
619 &route->path_rec[0]);
620 break;
621 default:
622 break;
623 }
624 }
625
626 static void ucma_copy_iboe_route(struct rdma_ucm_query_route_resp *resp,
627 struct rdma_route *route)
628 {
629 struct rdma_dev_addr *dev_addr;
630 struct net_device *dev;
631 u16 vid = 0;
632
633 resp->num_paths = route->num_paths;
634 switch (route->num_paths) {
635 case 0:
636 dev_addr = &route->addr.dev_addr;
637 dev = dev_get_by_index(&init_net, dev_addr->bound_dev_if);
638 if (dev) {
639 vid = rdma_vlan_dev_vlan_id(dev);
640 dev_put(dev);
641 }
642
643 iboe_mac_vlan_to_ll((union ib_gid *) &resp->ib_route[0].dgid,
644 dev_addr->dst_dev_addr, vid);
645 iboe_addr_get_sgid(dev_addr,
646 (union ib_gid *) &resp->ib_route[0].sgid);
647 resp->ib_route[0].pkey = cpu_to_be16(0xffff);
648 break;
649 case 2:
650 ib_copy_path_rec_to_user(&resp->ib_route[1],
651 &route->path_rec[1]);
652 /* fall through */
653 case 1:
654 ib_copy_path_rec_to_user(&resp->ib_route[0],
655 &route->path_rec[0]);
656 break;
657 default:
658 break;
659 }
660 }
661
662 static void ucma_copy_iw_route(struct rdma_ucm_query_route_resp *resp,
663 struct rdma_route *route)
664 {
665 struct rdma_dev_addr *dev_addr;
666
667 dev_addr = &route->addr.dev_addr;
668 rdma_addr_get_dgid(dev_addr, (union ib_gid *) &resp->ib_route[0].dgid);
669 rdma_addr_get_sgid(dev_addr, (union ib_gid *) &resp->ib_route[0].sgid);
670 }
671
672 static ssize_t ucma_query_route(struct ucma_file *file,
673 const char __user *inbuf,
674 int in_len, int out_len)
675 {
676 struct rdma_ucm_query_route cmd;
677 struct rdma_ucm_query_route_resp resp;
678 struct ucma_context *ctx;
679 struct sockaddr *addr;
680 int ret = 0;
681
682 if (out_len < sizeof(resp))
683 return -ENOSPC;
684
685 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
686 return -EFAULT;
687
688 ctx = ucma_get_ctx(file, cmd.id);
689 if (IS_ERR(ctx))
690 return PTR_ERR(ctx);
691
692 memset(&resp, 0, sizeof resp);
693 addr = (struct sockaddr *) &ctx->cm_id->route.addr.src_addr;
694 memcpy(&resp.src_addr, addr, addr->sa_family == AF_INET ?
695 sizeof(struct sockaddr_in) :
696 sizeof(struct sockaddr_in6));
697 addr = (struct sockaddr *) &ctx->cm_id->route.addr.dst_addr;
698 memcpy(&resp.dst_addr, addr, addr->sa_family == AF_INET ?
699 sizeof(struct sockaddr_in) :
700 sizeof(struct sockaddr_in6));
701 if (!ctx->cm_id->device)
702 goto out;
703
704 resp.node_guid = (__force __u64) ctx->cm_id->device->node_guid;
705 resp.port_num = ctx->cm_id->port_num;
706 switch (rdma_node_get_transport(ctx->cm_id->device->node_type)) {
707 case RDMA_TRANSPORT_IB:
708 switch (rdma_port_get_link_layer(ctx->cm_id->device,
709 ctx->cm_id->port_num)) {
710 case IB_LINK_LAYER_INFINIBAND:
711 ucma_copy_ib_route(&resp, &ctx->cm_id->route);
712 break;
713 case IB_LINK_LAYER_ETHERNET:
714 ucma_copy_iboe_route(&resp, &ctx->cm_id->route);
715 break;
716 default:
717 break;
718 }
719 break;
720 case RDMA_TRANSPORT_IWARP:
721 ucma_copy_iw_route(&resp, &ctx->cm_id->route);
722 break;
723 default:
724 break;
725 }
726
727 out:
728 if (copy_to_user((void __user *)(unsigned long)cmd.response,
729 &resp, sizeof(resp)))
730 ret = -EFAULT;
731
732 ucma_put_ctx(ctx);
733 return ret;
734 }
735
736 static void ucma_copy_conn_param(struct rdma_conn_param *dst,
737 struct rdma_ucm_conn_param *src)
738 {
739 dst->private_data = src->private_data;
740 dst->private_data_len = src->private_data_len;
741 dst->responder_resources =src->responder_resources;
742 dst->initiator_depth = src->initiator_depth;
743 dst->flow_control = src->flow_control;
744 dst->retry_count = src->retry_count;
745 dst->rnr_retry_count = src->rnr_retry_count;
746 dst->srq = src->srq;
747 dst->qp_num = src->qp_num;
748 }
749
750 static ssize_t ucma_connect(struct ucma_file *file, const char __user *inbuf,
751 int in_len, int out_len)
752 {
753 struct rdma_ucm_connect cmd;
754 struct rdma_conn_param conn_param;
755 struct ucma_context *ctx;
756 int ret;
757
758 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
759 return -EFAULT;
760
761 if (!cmd.conn_param.valid)
762 return -EINVAL;
763
764 ctx = ucma_get_ctx(file, cmd.id);
765 if (IS_ERR(ctx))
766 return PTR_ERR(ctx);
767
768 ucma_copy_conn_param(&conn_param, &cmd.conn_param);
769 ret = rdma_connect(ctx->cm_id, &conn_param);
770 ucma_put_ctx(ctx);
771 return ret;
772 }
773
774 static ssize_t ucma_listen(struct ucma_file *file, const char __user *inbuf,
775 int in_len, int out_len)
776 {
777 struct rdma_ucm_listen cmd;
778 struct ucma_context *ctx;
779 int ret;
780
781 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
782 return -EFAULT;
783
784 ctx = ucma_get_ctx(file, cmd.id);
785 if (IS_ERR(ctx))
786 return PTR_ERR(ctx);
787
788 ctx->backlog = cmd.backlog > 0 && cmd.backlog < max_backlog ?
789 cmd.backlog : max_backlog;
790 ret = rdma_listen(ctx->cm_id, ctx->backlog);
791 ucma_put_ctx(ctx);
792 return ret;
793 }
794
795 static ssize_t ucma_accept(struct ucma_file *file, const char __user *inbuf,
796 int in_len, int out_len)
797 {
798 struct rdma_ucm_accept cmd;
799 struct rdma_conn_param conn_param;
800 struct ucma_context *ctx;
801 int ret;
802
803 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
804 return -EFAULT;
805
806 ctx = ucma_get_ctx(file, cmd.id);
807 if (IS_ERR(ctx))
808 return PTR_ERR(ctx);
809
810 if (cmd.conn_param.valid) {
811 ctx->uid = cmd.uid;
812 ucma_copy_conn_param(&conn_param, &cmd.conn_param);
813 ret = rdma_accept(ctx->cm_id, &conn_param);
814 } else
815 ret = rdma_accept(ctx->cm_id, NULL);
816
817 ucma_put_ctx(ctx);
818 return ret;
819 }
820
821 static ssize_t ucma_reject(struct ucma_file *file, const char __user *inbuf,
822 int in_len, int out_len)
823 {
824 struct rdma_ucm_reject cmd;
825 struct ucma_context *ctx;
826 int ret;
827
828 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
829 return -EFAULT;
830
831 ctx = ucma_get_ctx(file, cmd.id);
832 if (IS_ERR(ctx))
833 return PTR_ERR(ctx);
834
835 ret = rdma_reject(ctx->cm_id, cmd.private_data, cmd.private_data_len);
836 ucma_put_ctx(ctx);
837 return ret;
838 }
839
840 static ssize_t ucma_disconnect(struct ucma_file *file, const char __user *inbuf,
841 int in_len, int out_len)
842 {
843 struct rdma_ucm_disconnect cmd;
844 struct ucma_context *ctx;
845 int ret;
846
847 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
848 return -EFAULT;
849
850 ctx = ucma_get_ctx(file, cmd.id);
851 if (IS_ERR(ctx))
852 return PTR_ERR(ctx);
853
854 ret = rdma_disconnect(ctx->cm_id);
855 ucma_put_ctx(ctx);
856 return ret;
857 }
858
859 static ssize_t ucma_init_qp_attr(struct ucma_file *file,
860 const char __user *inbuf,
861 int in_len, int out_len)
862 {
863 struct rdma_ucm_init_qp_attr cmd;
864 struct ib_uverbs_qp_attr resp;
865 struct ucma_context *ctx;
866 struct ib_qp_attr qp_attr;
867 int ret;
868
869 if (out_len < sizeof(resp))
870 return -ENOSPC;
871
872 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
873 return -EFAULT;
874
875 ctx = ucma_get_ctx(file, cmd.id);
876 if (IS_ERR(ctx))
877 return PTR_ERR(ctx);
878
879 resp.qp_attr_mask = 0;
880 memset(&qp_attr, 0, sizeof qp_attr);
881 qp_attr.qp_state = cmd.qp_state;
882 ret = rdma_init_qp_attr(ctx->cm_id, &qp_attr, &resp.qp_attr_mask);
883 if (ret)
884 goto out;
885
886 ib_copy_qp_attr_to_user(&resp, &qp_attr);
887 if (copy_to_user((void __user *)(unsigned long)cmd.response,
888 &resp, sizeof(resp)))
889 ret = -EFAULT;
890
891 out:
892 ucma_put_ctx(ctx);
893 return ret;
894 }
895
896 static int ucma_set_option_id(struct ucma_context *ctx, int optname,
897 void *optval, size_t optlen)
898 {
899 int ret = 0;
900
901 switch (optname) {
902 case RDMA_OPTION_ID_TOS:
903 if (optlen != sizeof(u8)) {
904 ret = -EINVAL;
905 break;
906 }
907 rdma_set_service_type(ctx->cm_id, *((u8 *) optval));
908 break;
909 case RDMA_OPTION_ID_REUSEADDR:
910 if (optlen != sizeof(int)) {
911 ret = -EINVAL;
912 break;
913 }
914 ret = rdma_set_reuseaddr(ctx->cm_id, *((int *) optval) ? 1 : 0);
915 break;
916 default:
917 ret = -ENOSYS;
918 }
919
920 return ret;
921 }
922
923 static int ucma_set_ib_path(struct ucma_context *ctx,
924 struct ib_path_rec_data *path_data, size_t optlen)
925 {
926 struct ib_sa_path_rec sa_path;
927 struct rdma_cm_event event;
928 int ret;
929
930 if (optlen % sizeof(*path_data))
931 return -EINVAL;
932
933 for (; optlen; optlen -= sizeof(*path_data), path_data++) {
934 if (path_data->flags == (IB_PATH_GMP | IB_PATH_PRIMARY |
935 IB_PATH_BIDIRECTIONAL))
936 break;
937 }
938
939 if (!optlen)
940 return -EINVAL;
941
942 ib_sa_unpack_path(path_data->path_rec, &sa_path);
943 ret = rdma_set_ib_paths(ctx->cm_id, &sa_path, 1);
944 if (ret)
945 return ret;
946
947 memset(&event, 0, sizeof event);
948 event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
949 return ucma_event_handler(ctx->cm_id, &event);
950 }
951
952 static int ucma_set_option_ib(struct ucma_context *ctx, int optname,
953 void *optval, size_t optlen)
954 {
955 int ret;
956
957 switch (optname) {
958 case RDMA_OPTION_IB_PATH:
959 ret = ucma_set_ib_path(ctx, optval, optlen);
960 break;
961 default:
962 ret = -ENOSYS;
963 }
964
965 return ret;
966 }
967
968 static int ucma_set_option_level(struct ucma_context *ctx, int level,
969 int optname, void *optval, size_t optlen)
970 {
971 int ret;
972
973 switch (level) {
974 case RDMA_OPTION_ID:
975 ret = ucma_set_option_id(ctx, optname, optval, optlen);
976 break;
977 case RDMA_OPTION_IB:
978 ret = ucma_set_option_ib(ctx, optname, optval, optlen);
979 break;
980 default:
981 ret = -ENOSYS;
982 }
983
984 return ret;
985 }
986
987 static ssize_t ucma_set_option(struct ucma_file *file, const char __user *inbuf,
988 int in_len, int out_len)
989 {
990 struct rdma_ucm_set_option cmd;
991 struct ucma_context *ctx;
992 void *optval;
993 int ret;
994
995 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
996 return -EFAULT;
997
998 ctx = ucma_get_ctx(file, cmd.id);
999 if (IS_ERR(ctx))
1000 return PTR_ERR(ctx);
1001
1002 optval = kmalloc(cmd.optlen, GFP_KERNEL);
1003 if (!optval) {
1004 ret = -ENOMEM;
1005 goto out1;
1006 }
1007
1008 if (copy_from_user(optval, (void __user *) (unsigned long) cmd.optval,
1009 cmd.optlen)) {
1010 ret = -EFAULT;
1011 goto out2;
1012 }
1013
1014 ret = ucma_set_option_level(ctx, cmd.level, cmd.optname, optval,
1015 cmd.optlen);
1016 out2:
1017 kfree(optval);
1018 out1:
1019 ucma_put_ctx(ctx);
1020 return ret;
1021 }
1022
1023 static ssize_t ucma_notify(struct ucma_file *file, const char __user *inbuf,
1024 int in_len, int out_len)
1025 {
1026 struct rdma_ucm_notify cmd;
1027 struct ucma_context *ctx;
1028 int ret;
1029
1030 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1031 return -EFAULT;
1032
1033 ctx = ucma_get_ctx(file, cmd.id);
1034 if (IS_ERR(ctx))
1035 return PTR_ERR(ctx);
1036
1037 ret = rdma_notify(ctx->cm_id, (enum ib_event_type) cmd.event);
1038 ucma_put_ctx(ctx);
1039 return ret;
1040 }
1041
1042 static ssize_t ucma_join_multicast(struct ucma_file *file,
1043 const char __user *inbuf,
1044 int in_len, int out_len)
1045 {
1046 struct rdma_ucm_join_mcast cmd;
1047 struct rdma_ucm_create_id_resp resp;
1048 struct ucma_context *ctx;
1049 struct ucma_multicast *mc;
1050 int ret;
1051
1052 if (out_len < sizeof(resp))
1053 return -ENOSPC;
1054
1055 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1056 return -EFAULT;
1057
1058 ctx = ucma_get_ctx(file, cmd.id);
1059 if (IS_ERR(ctx))
1060 return PTR_ERR(ctx);
1061
1062 mutex_lock(&file->mut);
1063 mc = ucma_alloc_multicast(ctx);
1064 if (!mc) {
1065 ret = -ENOMEM;
1066 goto err1;
1067 }
1068
1069 mc->uid = cmd.uid;
1070 memcpy(&mc->addr, &cmd.addr, sizeof cmd.addr);
1071 ret = rdma_join_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr, mc);
1072 if (ret)
1073 goto err2;
1074
1075 resp.id = mc->id;
1076 if (copy_to_user((void __user *)(unsigned long)cmd.response,
1077 &resp, sizeof(resp))) {
1078 ret = -EFAULT;
1079 goto err3;
1080 }
1081
1082 mutex_unlock(&file->mut);
1083 ucma_put_ctx(ctx);
1084 return 0;
1085
1086 err3:
1087 rdma_leave_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr);
1088 ucma_cleanup_mc_events(mc);
1089 err2:
1090 mutex_lock(&mut);
1091 idr_remove(&multicast_idr, mc->id);
1092 mutex_unlock(&mut);
1093 list_del(&mc->list);
1094 kfree(mc);
1095 err1:
1096 mutex_unlock(&file->mut);
1097 ucma_put_ctx(ctx);
1098 return ret;
1099 }
1100
1101 static ssize_t ucma_leave_multicast(struct ucma_file *file,
1102 const char __user *inbuf,
1103 int in_len, int out_len)
1104 {
1105 struct rdma_ucm_destroy_id cmd;
1106 struct rdma_ucm_destroy_id_resp resp;
1107 struct ucma_multicast *mc;
1108 int ret = 0;
1109
1110 if (out_len < sizeof(resp))
1111 return -ENOSPC;
1112
1113 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1114 return -EFAULT;
1115
1116 mutex_lock(&mut);
1117 mc = idr_find(&multicast_idr, cmd.id);
1118 if (!mc)
1119 mc = ERR_PTR(-ENOENT);
1120 else if (mc->ctx->file != file)
1121 mc = ERR_PTR(-EINVAL);
1122 else {
1123 idr_remove(&multicast_idr, mc->id);
1124 atomic_inc(&mc->ctx->ref);
1125 }
1126 mutex_unlock(&mut);
1127
1128 if (IS_ERR(mc)) {
1129 ret = PTR_ERR(mc);
1130 goto out;
1131 }
1132
1133 rdma_leave_multicast(mc->ctx->cm_id, (struct sockaddr *) &mc->addr);
1134 mutex_lock(&mc->ctx->file->mut);
1135 ucma_cleanup_mc_events(mc);
1136 list_del(&mc->list);
1137 mutex_unlock(&mc->ctx->file->mut);
1138
1139 ucma_put_ctx(mc->ctx);
1140 resp.events_reported = mc->events_reported;
1141 kfree(mc);
1142
1143 if (copy_to_user((void __user *)(unsigned long)cmd.response,
1144 &resp, sizeof(resp)))
1145 ret = -EFAULT;
1146 out:
1147 return ret;
1148 }
1149
1150 static void ucma_lock_files(struct ucma_file *file1, struct ucma_file *file2)
1151 {
1152 /* Acquire mutex's based on pointer comparison to prevent deadlock. */
1153 if (file1 < file2) {
1154 mutex_lock(&file1->mut);
1155 mutex_lock(&file2->mut);
1156 } else {
1157 mutex_lock(&file2->mut);
1158 mutex_lock(&file1->mut);
1159 }
1160 }
1161
1162 static void ucma_unlock_files(struct ucma_file *file1, struct ucma_file *file2)
1163 {
1164 if (file1 < file2) {
1165 mutex_unlock(&file2->mut);
1166 mutex_unlock(&file1->mut);
1167 } else {
1168 mutex_unlock(&file1->mut);
1169 mutex_unlock(&file2->mut);
1170 }
1171 }
1172
1173 static void ucma_move_events(struct ucma_context *ctx, struct ucma_file *file)
1174 {
1175 struct ucma_event *uevent, *tmp;
1176
1177 list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list)
1178 if (uevent->ctx == ctx)
1179 list_move_tail(&uevent->list, &file->event_list);
1180 }
1181
1182 static ssize_t ucma_migrate_id(struct ucma_file *new_file,
1183 const char __user *inbuf,
1184 int in_len, int out_len)
1185 {
1186 struct rdma_ucm_migrate_id cmd;
1187 struct rdma_ucm_migrate_resp resp;
1188 struct ucma_context *ctx;
1189 struct file *filp;
1190 struct ucma_file *cur_file;
1191 int ret = 0;
1192
1193 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1194 return -EFAULT;
1195
1196 /* Get current fd to protect against it being closed */
1197 filp = fget(cmd.fd);
1198 if (!filp)
1199 return -ENOENT;
1200
1201 /* Validate current fd and prevent destruction of id. */
1202 ctx = ucma_get_ctx(filp->private_data, cmd.id);
1203 if (IS_ERR(ctx)) {
1204 ret = PTR_ERR(ctx);
1205 goto file_put;
1206 }
1207
1208 cur_file = ctx->file;
1209 if (cur_file == new_file) {
1210 resp.events_reported = ctx->events_reported;
1211 goto response;
1212 }
1213
1214 /*
1215 * Migrate events between fd's, maintaining order, and avoiding new
1216 * events being added before existing events.
1217 */
1218 ucma_lock_files(cur_file, new_file);
1219 mutex_lock(&mut);
1220
1221 list_move_tail(&ctx->list, &new_file->ctx_list);
1222 ucma_move_events(ctx, new_file);
1223 ctx->file = new_file;
1224 resp.events_reported = ctx->events_reported;
1225
1226 mutex_unlock(&mut);
1227 ucma_unlock_files(cur_file, new_file);
1228
1229 response:
1230 if (copy_to_user((void __user *)(unsigned long)cmd.response,
1231 &resp, sizeof(resp)))
1232 ret = -EFAULT;
1233
1234 ucma_put_ctx(ctx);
1235 file_put:
1236 fput(filp);
1237 return ret;
1238 }
1239
1240 static ssize_t (*ucma_cmd_table[])(struct ucma_file *file,
1241 const char __user *inbuf,
1242 int in_len, int out_len) = {
1243 [RDMA_USER_CM_CMD_CREATE_ID] = ucma_create_id,
1244 [RDMA_USER_CM_CMD_DESTROY_ID] = ucma_destroy_id,
1245 [RDMA_USER_CM_CMD_BIND_ADDR] = ucma_bind_addr,
1246 [RDMA_USER_CM_CMD_RESOLVE_ADDR] = ucma_resolve_addr,
1247 [RDMA_USER_CM_CMD_RESOLVE_ROUTE]= ucma_resolve_route,
1248 [RDMA_USER_CM_CMD_QUERY_ROUTE] = ucma_query_route,
1249 [RDMA_USER_CM_CMD_CONNECT] = ucma_connect,
1250 [RDMA_USER_CM_CMD_LISTEN] = ucma_listen,
1251 [RDMA_USER_CM_CMD_ACCEPT] = ucma_accept,
1252 [RDMA_USER_CM_CMD_REJECT] = ucma_reject,
1253 [RDMA_USER_CM_CMD_DISCONNECT] = ucma_disconnect,
1254 [RDMA_USER_CM_CMD_INIT_QP_ATTR] = ucma_init_qp_attr,
1255 [RDMA_USER_CM_CMD_GET_EVENT] = ucma_get_event,
1256 [RDMA_USER_CM_CMD_GET_OPTION] = NULL,
1257 [RDMA_USER_CM_CMD_SET_OPTION] = ucma_set_option,
1258 [RDMA_USER_CM_CMD_NOTIFY] = ucma_notify,
1259 [RDMA_USER_CM_CMD_JOIN_MCAST] = ucma_join_multicast,
1260 [RDMA_USER_CM_CMD_LEAVE_MCAST] = ucma_leave_multicast,
1261 [RDMA_USER_CM_CMD_MIGRATE_ID] = ucma_migrate_id
1262 };
1263
1264 static ssize_t ucma_write(struct file *filp, const char __user *buf,
1265 size_t len, loff_t *pos)
1266 {
1267 struct ucma_file *file = filp->private_data;
1268 struct rdma_ucm_cmd_hdr hdr;
1269 ssize_t ret;
1270
1271 if (len < sizeof(hdr))
1272 return -EINVAL;
1273
1274 if (copy_from_user(&hdr, buf, sizeof(hdr)))
1275 return -EFAULT;
1276
1277 if (hdr.cmd >= ARRAY_SIZE(ucma_cmd_table))
1278 return -EINVAL;
1279
1280 if (hdr.in + sizeof(hdr) > len)
1281 return -EINVAL;
1282
1283 if (!ucma_cmd_table[hdr.cmd])
1284 return -ENOSYS;
1285
1286 ret = ucma_cmd_table[hdr.cmd](file, buf + sizeof(hdr), hdr.in, hdr.out);
1287 if (!ret)
1288 ret = len;
1289
1290 return ret;
1291 }
1292
1293 static unsigned int ucma_poll(struct file *filp, struct poll_table_struct *wait)
1294 {
1295 struct ucma_file *file = filp->private_data;
1296 unsigned int mask = 0;
1297
1298 poll_wait(filp, &file->poll_wait, wait);
1299
1300 if (!list_empty(&file->event_list))
1301 mask = POLLIN | POLLRDNORM;
1302
1303 return mask;
1304 }
1305
1306 /*
1307 * ucma_open() does not need the BKL:
1308 *
1309 * - no global state is referred to;
1310 * - there is no ioctl method to race against;
1311 * - no further module initialization is required for open to work
1312 * after the device is registered.
1313 */
1314 static int ucma_open(struct inode *inode, struct file *filp)
1315 {
1316 struct ucma_file *file;
1317
1318 file = kmalloc(sizeof *file, GFP_KERNEL);
1319 if (!file)
1320 return -ENOMEM;
1321
1322 INIT_LIST_HEAD(&file->event_list);
1323 INIT_LIST_HEAD(&file->ctx_list);
1324 init_waitqueue_head(&file->poll_wait);
1325 mutex_init(&file->mut);
1326
1327 filp->private_data = file;
1328 file->filp = filp;
1329
1330 return nonseekable_open(inode, filp);
1331 }
1332
1333 static int ucma_close(struct inode *inode, struct file *filp)
1334 {
1335 struct ucma_file *file = filp->private_data;
1336 struct ucma_context *ctx, *tmp;
1337
1338 mutex_lock(&file->mut);
1339 list_for_each_entry_safe(ctx, tmp, &file->ctx_list, list) {
1340 mutex_unlock(&file->mut);
1341
1342 mutex_lock(&mut);
1343 idr_remove(&ctx_idr, ctx->id);
1344 mutex_unlock(&mut);
1345
1346 ucma_free_ctx(ctx);
1347 mutex_lock(&file->mut);
1348 }
1349 mutex_unlock(&file->mut);
1350 kfree(file);
1351 return 0;
1352 }
1353
1354 static const struct file_operations ucma_fops = {
1355 .owner = THIS_MODULE,
1356 .open = ucma_open,
1357 .release = ucma_close,
1358 .write = ucma_write,
1359 .poll = ucma_poll,
1360 .llseek = no_llseek,
1361 };
1362
1363 static struct miscdevice ucma_misc = {
1364 .minor = MISC_DYNAMIC_MINOR,
1365 .name = "rdma_cm",
1366 .nodename = "infiniband/rdma_cm",
1367 .mode = 0666,
1368 .fops = &ucma_fops,
1369 };
1370
1371 static ssize_t show_abi_version(struct device *dev,
1372 struct device_attribute *attr,
1373 char *buf)
1374 {
1375 return sprintf(buf, "%d\n", RDMA_USER_CM_ABI_VERSION);
1376 }
1377 static DEVICE_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
1378
1379 static int __init ucma_init(void)
1380 {
1381 int ret;
1382
1383 ret = misc_register(&ucma_misc);
1384 if (ret)
1385 return ret;
1386
1387 ret = device_create_file(ucma_misc.this_device, &dev_attr_abi_version);
1388 if (ret) {
1389 printk(KERN_ERR "rdma_ucm: couldn't create abi_version attr\n");
1390 goto err1;
1391 }
1392
1393 ucma_ctl_table_hdr = register_sysctl_paths(ucma_ctl_path, ucma_ctl_table);
1394 if (!ucma_ctl_table_hdr) {
1395 printk(KERN_ERR "rdma_ucm: couldn't register sysctl paths\n");
1396 ret = -ENOMEM;
1397 goto err2;
1398 }
1399 return 0;
1400 err2:
1401 device_remove_file(ucma_misc.this_device, &dev_attr_abi_version);
1402 err1:
1403 misc_deregister(&ucma_misc);
1404 return ret;
1405 }
1406
1407 static void __exit ucma_cleanup(void)
1408 {
1409 unregister_sysctl_table(ucma_ctl_table_hdr);
1410 device_remove_file(ucma_misc.this_device, &dev_attr_abi_version);
1411 misc_deregister(&ucma_misc);
1412 idr_destroy(&ctx_idr);
1413 }
1414
1415 module_init(ucma_init);
1416 module_exit(ucma_cleanup);