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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
45#include <rdma/rdma_user_cm.h>
46#include <rdma/ib_marshall.h>
47#include <rdma/rdma_cm.h>
48#include <rdma/rdma_cm_ib.h>
49
50MODULE_AUTHOR("Sean Hefty");
51MODULE_DESCRIPTION("RDMA Userspace Connection Manager Access");
52MODULE_LICENSE("Dual BSD/GPL");
53
54static unsigned int max_backlog = 1024;
55
56static struct ctl_table_header *ucma_ctl_table_hdr;
57static ctl_table ucma_ctl_table[] = {
58 {
59 .procname = "max_backlog",
60 .data = &max_backlog,
61 .maxlen = sizeof max_backlog,
62 .mode = 0644,
63 .proc_handler = proc_dointvec,
64 },
65 { }
66};
67
68static struct ctl_path ucma_ctl_path[] = {
69 { .procname = "net" },
70 { .procname = "rdma_ucm" },
71 { }
72};
73
74struct ucma_file {
75 struct mutex mut;
76 struct file *filp;
77 struct list_head ctx_list;
78 struct list_head event_list;
79 wait_queue_head_t poll_wait;
80};
81
82struct ucma_context {
83 int id;
84 struct completion comp;
85 atomic_t ref;
86 int events_reported;
87 int backlog;
88
89 struct ucma_file *file;
90 struct rdma_cm_id *cm_id;
91 u64 uid;
92
93 struct list_head list;
94 struct list_head mc_list;
95};
96
97struct ucma_multicast {
98 struct ucma_context *ctx;
99 int id;
100 int events_reported;
101
102 u64 uid;
103 struct list_head list;
104 struct sockaddr_storage addr;
105};
106
107struct ucma_event {
108 struct ucma_context *ctx;
109 struct ucma_multicast *mc;
110 struct list_head list;
111 struct rdma_cm_id *cm_id;
112 struct rdma_ucm_event_resp resp;
113};
114
115static DEFINE_MUTEX(mut);
116static DEFINE_IDR(ctx_idr);
117static DEFINE_IDR(multicast_idr);
118
119static inline struct ucma_context *_ucma_find_context(int id,
120 struct ucma_file *file)
121{
122 struct ucma_context *ctx;
123
124 ctx = idr_find(&ctx_idr, id);
125 if (!ctx)
126 ctx = ERR_PTR(-ENOENT);
127 else if (ctx->file != file)
128 ctx = ERR_PTR(-EINVAL);
129 return ctx;
130}
131
132static struct ucma_context *ucma_get_ctx(struct ucma_file *file, int id)
133{
134 struct ucma_context *ctx;
135
136 mutex_lock(&mut);
137 ctx = _ucma_find_context(id, file);
138 if (!IS_ERR(ctx))
139 atomic_inc(&ctx->ref);
140 mutex_unlock(&mut);
141 return ctx;
142}
143
144static void ucma_put_ctx(struct ucma_context *ctx)
145{
146 if (atomic_dec_and_test(&ctx->ref))
147 complete(&ctx->comp);
148}
149
150static struct ucma_context *ucma_alloc_ctx(struct ucma_file *file)
151{
152 struct ucma_context *ctx;
153 int ret;
154
155 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
156 if (!ctx)
157 return NULL;
158
159 atomic_set(&ctx->ref, 1);
160 init_completion(&ctx->comp);
161 INIT_LIST_HEAD(&ctx->mc_list);
162 ctx->file = file;
163
164 do {
165 ret = idr_pre_get(&ctx_idr, GFP_KERNEL);
166 if (!ret)
167 goto error;
168
169 mutex_lock(&mut);
170 ret = idr_get_new(&ctx_idr, ctx, &ctx->id);
171 mutex_unlock(&mut);
172 } while (ret == -EAGAIN);
173
174 if (ret)
175 goto error;
176
177 list_add_tail(&ctx->list, &file->ctx_list);
178 return ctx;
179
180error:
181 kfree(ctx);
182 return NULL;
183}
184
185static struct ucma_multicast* ucma_alloc_multicast(struct ucma_context *ctx)
186{
187 struct ucma_multicast *mc;
188 int ret;
189
190 mc = kzalloc(sizeof(*mc), GFP_KERNEL);
191 if (!mc)
192 return NULL;
193
194 do {
195 ret = idr_pre_get(&multicast_idr, GFP_KERNEL);
196 if (!ret)
197 goto error;
198
199 mutex_lock(&mut);
200 ret = idr_get_new(&multicast_idr, mc, &mc->id);
201 mutex_unlock(&mut);
202 } while (ret == -EAGAIN);
203
204 if (ret)
205 goto error;
206
207 mc->ctx = ctx;
208 list_add_tail(&mc->list, &ctx->mc_list);
209 return mc;
210
211error:
212 kfree(mc);
213 return NULL;
214}
215
216static void ucma_copy_conn_event(struct rdma_ucm_conn_param *dst,
217 struct rdma_conn_param *src)
218{
219 if (src->private_data_len)
220 memcpy(dst->private_data, src->private_data,
221 src->private_data_len);
222 dst->private_data_len = src->private_data_len;
223 dst->responder_resources =src->responder_resources;
224 dst->initiator_depth = src->initiator_depth;
225 dst->flow_control = src->flow_control;
226 dst->retry_count = src->retry_count;
227 dst->rnr_retry_count = src->rnr_retry_count;
228 dst->srq = src->srq;
229 dst->qp_num = src->qp_num;
230}
231
232static void ucma_copy_ud_event(struct rdma_ucm_ud_param *dst,
233 struct rdma_ud_param *src)
234{
235 if (src->private_data_len)
236 memcpy(dst->private_data, src->private_data,
237 src->private_data_len);
238 dst->private_data_len = src->private_data_len;
239 ib_copy_ah_attr_to_user(&dst->ah_attr, &src->ah_attr);
240 dst->qp_num = src->qp_num;
241 dst->qkey = src->qkey;
242}
243
244static void ucma_set_event_context(struct ucma_context *ctx,
245 struct rdma_cm_event *event,
246 struct ucma_event *uevent)
247{
248 uevent->ctx = ctx;
249 switch (event->event) {
250 case RDMA_CM_EVENT_MULTICAST_JOIN:
251 case RDMA_CM_EVENT_MULTICAST_ERROR:
252 uevent->mc = (struct ucma_multicast *)
253 event->param.ud.private_data;
254 uevent->resp.uid = uevent->mc->uid;
255 uevent->resp.id = uevent->mc->id;
256 break;
257 default:
258 uevent->resp.uid = ctx->uid;
259 uevent->resp.id = ctx->id;
260 break;
261 }
262}
263
264static int ucma_event_handler(struct rdma_cm_id *cm_id,
265 struct rdma_cm_event *event)
266{
267 struct ucma_event *uevent;
268 struct ucma_context *ctx = cm_id->context;
269 int ret = 0;
270
271 uevent = kzalloc(sizeof(*uevent), GFP_KERNEL);
272 if (!uevent)
273 return event->event == RDMA_CM_EVENT_CONNECT_REQUEST;
274
275 uevent->cm_id = cm_id;
276 ucma_set_event_context(ctx, event, uevent);
277 uevent->resp.event = event->event;
278 uevent->resp.status = event->status;
279 if (cm_id->ps == RDMA_PS_UDP || cm_id->ps == RDMA_PS_IPOIB)
280 ucma_copy_ud_event(&uevent->resp.param.ud, &event->param.ud);
281 else
282 ucma_copy_conn_event(&uevent->resp.param.conn,
283 &event->param.conn);
284
285 mutex_lock(&ctx->file->mut);
286 if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST) {
287 if (!ctx->backlog) {
288 ret = -ENOMEM;
289 kfree(uevent);
290 goto out;
291 }
292 ctx->backlog--;
293 } else if (!ctx->uid) {
294 /*
295 * We ignore events for new connections until userspace has set
296 * their context. This can only happen if an error occurs on a
297 * new connection before the user accepts it. This is okay,
298 * since the accept will just fail later.
299 */
300 kfree(uevent);
301 goto out;
302 }
303
304 list_add_tail(&uevent->list, &ctx->file->event_list);
305 wake_up_interruptible(&ctx->file->poll_wait);
306out:
307 mutex_unlock(&ctx->file->mut);
308 return ret;
309}
310
311static ssize_t ucma_get_event(struct ucma_file *file, const char __user *inbuf,
312 int in_len, int out_len)
313{
314 struct ucma_context *ctx;
315 struct rdma_ucm_get_event cmd;
316 struct ucma_event *uevent;
317 int ret = 0;
318 DEFINE_WAIT(wait);
319
320 if (out_len < sizeof uevent->resp)
321 return -ENOSPC;
322
323 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
324 return -EFAULT;
325
326 mutex_lock(&file->mut);
327 while (list_empty(&file->event_list)) {
328 mutex_unlock(&file->mut);
329
330 if (file->filp->f_flags & O_NONBLOCK)
331 return -EAGAIN;
332
333 if (wait_event_interruptible(file->poll_wait,
334 !list_empty(&file->event_list)))
335 return -ERESTARTSYS;
336
337 mutex_lock(&file->mut);
338 }
339
340 uevent = list_entry(file->event_list.next, struct ucma_event, list);
341
342 if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST) {
343 ctx = ucma_alloc_ctx(file);
344 if (!ctx) {
345 ret = -ENOMEM;
346 goto done;
347 }
348 uevent->ctx->backlog++;
349 ctx->cm_id = uevent->cm_id;
350 ctx->cm_id->context = ctx;
351 uevent->resp.id = ctx->id;
352 }
353
354 if (copy_to_user((void __user *)(unsigned long)cmd.response,
355 &uevent->resp, sizeof uevent->resp)) {
356 ret = -EFAULT;
357 goto done;
358 }
359
360 list_del(&uevent->list);
361 uevent->ctx->events_reported++;
362 if (uevent->mc)
363 uevent->mc->events_reported++;
364 kfree(uevent);
365done:
366 mutex_unlock(&file->mut);
367 return ret;
368}
369
370static int ucma_get_qp_type(struct rdma_ucm_create_id *cmd, enum ib_qp_type *qp_type)
371{
372 switch (cmd->ps) {
373 case RDMA_PS_TCP:
374 *qp_type = IB_QPT_RC;
375 return 0;
376 case RDMA_PS_UDP:
377 case RDMA_PS_IPOIB:
378 *qp_type = IB_QPT_UD;
379 return 0;
380 default:
381 return -EINVAL;
382 }
383}
384
385static ssize_t ucma_create_id(struct ucma_file *file, const char __user *inbuf,
386 int in_len, int out_len)
387{
388 struct rdma_ucm_create_id cmd;
389 struct rdma_ucm_create_id_resp resp;
390 struct ucma_context *ctx;
391 enum ib_qp_type qp_type;
392 int ret;
393
394 if (out_len < sizeof(resp))
395 return -ENOSPC;
396
397 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
398 return -EFAULT;
399
400 ret = ucma_get_qp_type(&cmd, &qp_type);
401 if (ret)
402 return ret;
403
404 mutex_lock(&file->mut);
405 ctx = ucma_alloc_ctx(file);
406 mutex_unlock(&file->mut);
407 if (!ctx)
408 return -ENOMEM;
409
410 ctx->uid = cmd.uid;
411 ctx->cm_id = rdma_create_id(ucma_event_handler, ctx, cmd.ps, qp_type);
412 if (IS_ERR(ctx->cm_id)) {
413 ret = PTR_ERR(ctx->cm_id);
414 goto err1;
415 }
416
417 resp.id = ctx->id;
418 if (copy_to_user((void __user *)(unsigned long)cmd.response,
419 &resp, sizeof(resp))) {
420 ret = -EFAULT;
421 goto err2;
422 }
423 return 0;
424
425err2:
426 rdma_destroy_id(ctx->cm_id);
427err1:
428 mutex_lock(&mut);
429 idr_remove(&ctx_idr, ctx->id);
430 mutex_unlock(&mut);
431 kfree(ctx);
432 return ret;
433}
434
435static void ucma_cleanup_multicast(struct ucma_context *ctx)
436{
437 struct ucma_multicast *mc, *tmp;
438
439 mutex_lock(&mut);
440 list_for_each_entry_safe(mc, tmp, &ctx->mc_list, list) {
441 list_del(&mc->list);
442 idr_remove(&multicast_idr, mc->id);
443 kfree(mc);
444 }
445 mutex_unlock(&mut);
446}
447
448static void ucma_cleanup_events(struct ucma_context *ctx)
449{
450 struct ucma_event *uevent, *tmp;
451
452 list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list) {
453 if (uevent->ctx != ctx)
454 continue;
455
456 list_del(&uevent->list);
457
458 /* clear incoming connections. */
459 if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST)
460 rdma_destroy_id(uevent->cm_id);
461
462 kfree(uevent);
463 }
464}
465
466static void ucma_cleanup_mc_events(struct ucma_multicast *mc)
467{
468 struct ucma_event *uevent, *tmp;
469
470 list_for_each_entry_safe(uevent, tmp, &mc->ctx->file->event_list, list) {
471 if (uevent->mc != mc)
472 continue;
473
474 list_del(&uevent->list);
475 kfree(uevent);
476 }
477}
478
479static int ucma_free_ctx(struct ucma_context *ctx)
480{
481 int events_reported;
482
483 /* No new events will be generated after destroying the id. */
484 rdma_destroy_id(ctx->cm_id);
485
486 ucma_cleanup_multicast(ctx);
487
488 /* Cleanup events not yet reported to the user. */
489 mutex_lock(&ctx->file->mut);
490 ucma_cleanup_events(ctx);
491 list_del(&ctx->list);
492 mutex_unlock(&ctx->file->mut);
493
494 events_reported = ctx->events_reported;
495 kfree(ctx);
496 return events_reported;
497}
498
499static ssize_t ucma_destroy_id(struct ucma_file *file, const char __user *inbuf,
500 int in_len, int out_len)
501{
502 struct rdma_ucm_destroy_id cmd;
503 struct rdma_ucm_destroy_id_resp resp;
504 struct ucma_context *ctx;
505 int ret = 0;
506
507 if (out_len < sizeof(resp))
508 return -ENOSPC;
509
510 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
511 return -EFAULT;
512
513 mutex_lock(&mut);
514 ctx = _ucma_find_context(cmd.id, file);
515 if (!IS_ERR(ctx))
516 idr_remove(&ctx_idr, ctx->id);
517 mutex_unlock(&mut);
518
519 if (IS_ERR(ctx))
520 return PTR_ERR(ctx);
521
522 ucma_put_ctx(ctx);
523 wait_for_completion(&ctx->comp);
524 resp.events_reported = ucma_free_ctx(ctx);
525
526 if (copy_to_user((void __user *)(unsigned long)cmd.response,
527 &resp, sizeof(resp)))
528 ret = -EFAULT;
529
530 return ret;
531}
532
533static ssize_t ucma_bind_addr(struct ucma_file *file, const char __user *inbuf,
534 int in_len, int out_len)
535{
536 struct rdma_ucm_bind_addr cmd;
537 struct ucma_context *ctx;
538 int ret;
539
540 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
541 return -EFAULT;
542
543 ctx = ucma_get_ctx(file, cmd.id);
544 if (IS_ERR(ctx))
545 return PTR_ERR(ctx);
546
547 ret = rdma_bind_addr(ctx->cm_id, (struct sockaddr *) &cmd.addr);
548 ucma_put_ctx(ctx);
549 return ret;
550}
551
552static ssize_t ucma_resolve_addr(struct ucma_file *file,
553 const char __user *inbuf,
554 int in_len, int out_len)
555{
556 struct rdma_ucm_resolve_addr cmd;
557 struct ucma_context *ctx;
558 int ret;
559
560 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
561 return -EFAULT;
562
563 ctx = ucma_get_ctx(file, cmd.id);
564 if (IS_ERR(ctx))
565 return PTR_ERR(ctx);
566
567 ret = rdma_resolve_addr(ctx->cm_id, (struct sockaddr *) &cmd.src_addr,
568 (struct sockaddr *) &cmd.dst_addr,
569 cmd.timeout_ms);
570 ucma_put_ctx(ctx);
571 return ret;
572}
573
574static ssize_t ucma_resolve_route(struct ucma_file *file,
575 const char __user *inbuf,
576 int in_len, int out_len)
577{
578 struct rdma_ucm_resolve_route cmd;
579 struct ucma_context *ctx;
580 int ret;
581
582 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
583 return -EFAULT;
584
585 ctx = ucma_get_ctx(file, cmd.id);
586 if (IS_ERR(ctx))
587 return PTR_ERR(ctx);
588
589 ret = rdma_resolve_route(ctx->cm_id, cmd.timeout_ms);
590 ucma_put_ctx(ctx);
591 return ret;
592}
593
594static void ucma_copy_ib_route(struct rdma_ucm_query_route_resp *resp,
595 struct rdma_route *route)
596{
597 struct rdma_dev_addr *dev_addr;
598
599 resp->num_paths = route->num_paths;
600 switch (route->num_paths) {
601 case 0:
602 dev_addr = &route->addr.dev_addr;
603 rdma_addr_get_dgid(dev_addr,
604 (union ib_gid *) &resp->ib_route[0].dgid);
605 rdma_addr_get_sgid(dev_addr,
606 (union ib_gid *) &resp->ib_route[0].sgid);
607 resp->ib_route[0].pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
608 break;
609 case 2:
610 ib_copy_path_rec_to_user(&resp->ib_route[1],
611 &route->path_rec[1]);
612 /* fall through */
613 case 1:
614 ib_copy_path_rec_to_user(&resp->ib_route[0],
615 &route->path_rec[0]);
616 break;
617 default:
618 break;
619 }
620}
621
622static void ucma_copy_iboe_route(struct rdma_ucm_query_route_resp *resp,
623 struct rdma_route *route)
624{
625 struct rdma_dev_addr *dev_addr;
626 struct net_device *dev;
627 u16 vid = 0;
628
629 resp->num_paths = route->num_paths;
630 switch (route->num_paths) {
631 case 0:
632 dev_addr = &route->addr.dev_addr;
633 dev = dev_get_by_index(&init_net, dev_addr->bound_dev_if);
634 if (dev) {
635 vid = rdma_vlan_dev_vlan_id(dev);
636 dev_put(dev);
637 }
638
639 iboe_mac_vlan_to_ll((union ib_gid *) &resp->ib_route[0].dgid,
640 dev_addr->dst_dev_addr, vid);
641 iboe_addr_get_sgid(dev_addr,
642 (union ib_gid *) &resp->ib_route[0].sgid);
643 resp->ib_route[0].pkey = cpu_to_be16(0xffff);
644 break;
645 case 2:
646 ib_copy_path_rec_to_user(&resp->ib_route[1],
647 &route->path_rec[1]);
648 /* fall through */
649 case 1:
650 ib_copy_path_rec_to_user(&resp->ib_route[0],
651 &route->path_rec[0]);
652 break;
653 default:
654 break;
655 }
656}
657
658static void ucma_copy_iw_route(struct rdma_ucm_query_route_resp *resp,
659 struct rdma_route *route)
660{
661 struct rdma_dev_addr *dev_addr;
662
663 dev_addr = &route->addr.dev_addr;
664 rdma_addr_get_dgid(dev_addr, (union ib_gid *) &resp->ib_route[0].dgid);
665 rdma_addr_get_sgid(dev_addr, (union ib_gid *) &resp->ib_route[0].sgid);
666}
667
668static ssize_t ucma_query_route(struct ucma_file *file,
669 const char __user *inbuf,
670 int in_len, int out_len)
671{
672 struct rdma_ucm_query_route cmd;
673 struct rdma_ucm_query_route_resp resp;
674 struct ucma_context *ctx;
675 struct sockaddr *addr;
676 int ret = 0;
677
678 if (out_len < sizeof(resp))
679 return -ENOSPC;
680
681 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
682 return -EFAULT;
683
684 ctx = ucma_get_ctx(file, cmd.id);
685 if (IS_ERR(ctx))
686 return PTR_ERR(ctx);
687
688 memset(&resp, 0, sizeof resp);
689 addr = (struct sockaddr *) &ctx->cm_id->route.addr.src_addr;
690 memcpy(&resp.src_addr, addr, addr->sa_family == AF_INET ?
691 sizeof(struct sockaddr_in) :
692 sizeof(struct sockaddr_in6));
693 addr = (struct sockaddr *) &ctx->cm_id->route.addr.dst_addr;
694 memcpy(&resp.dst_addr, addr, addr->sa_family == AF_INET ?
695 sizeof(struct sockaddr_in) :
696 sizeof(struct sockaddr_in6));
697 if (!ctx->cm_id->device)
698 goto out;
699
700 resp.node_guid = (__force __u64) ctx->cm_id->device->node_guid;
701 resp.port_num = ctx->cm_id->port_num;
702 switch (rdma_node_get_transport(ctx->cm_id->device->node_type)) {
703 case RDMA_TRANSPORT_IB:
704 switch (rdma_port_get_link_layer(ctx->cm_id->device,
705 ctx->cm_id->port_num)) {
706 case IB_LINK_LAYER_INFINIBAND:
707 ucma_copy_ib_route(&resp, &ctx->cm_id->route);
708 break;
709 case IB_LINK_LAYER_ETHERNET:
710 ucma_copy_iboe_route(&resp, &ctx->cm_id->route);
711 break;
712 default:
713 break;
714 }
715 break;
716 case RDMA_TRANSPORT_IWARP:
717 ucma_copy_iw_route(&resp, &ctx->cm_id->route);
718 break;
719 default:
720 break;
721 }
722
723out:
724 if (copy_to_user((void __user *)(unsigned long)cmd.response,
725 &resp, sizeof(resp)))
726 ret = -EFAULT;
727
728 ucma_put_ctx(ctx);
729 return ret;
730}
731
732static void ucma_copy_conn_param(struct rdma_conn_param *dst,
733 struct rdma_ucm_conn_param *src)
734{
735 dst->private_data = src->private_data;
736 dst->private_data_len = src->private_data_len;
737 dst->responder_resources =src->responder_resources;
738 dst->initiator_depth = src->initiator_depth;
739 dst->flow_control = src->flow_control;
740 dst->retry_count = src->retry_count;
741 dst->rnr_retry_count = src->rnr_retry_count;
742 dst->srq = src->srq;
743 dst->qp_num = src->qp_num;
744}
745
746static ssize_t ucma_connect(struct ucma_file *file, const char __user *inbuf,
747 int in_len, int out_len)
748{
749 struct rdma_ucm_connect cmd;
750 struct rdma_conn_param conn_param;
751 struct ucma_context *ctx;
752 int ret;
753
754 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
755 return -EFAULT;
756
757 if (!cmd.conn_param.valid)
758 return -EINVAL;
759
760 ctx = ucma_get_ctx(file, cmd.id);
761 if (IS_ERR(ctx))
762 return PTR_ERR(ctx);
763
764 ucma_copy_conn_param(&conn_param, &cmd.conn_param);
765 ret = rdma_connect(ctx->cm_id, &conn_param);
766 ucma_put_ctx(ctx);
767 return ret;
768}
769
770static ssize_t ucma_listen(struct ucma_file *file, const char __user *inbuf,
771 int in_len, int out_len)
772{
773 struct rdma_ucm_listen cmd;
774 struct ucma_context *ctx;
775 int ret;
776
777 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
778 return -EFAULT;
779
780 ctx = ucma_get_ctx(file, cmd.id);
781 if (IS_ERR(ctx))
782 return PTR_ERR(ctx);
783
784 ctx->backlog = cmd.backlog > 0 && cmd.backlog < max_backlog ?
785 cmd.backlog : max_backlog;
786 ret = rdma_listen(ctx->cm_id, ctx->backlog);
787 ucma_put_ctx(ctx);
788 return ret;
789}
790
791static ssize_t ucma_accept(struct ucma_file *file, const char __user *inbuf,
792 int in_len, int out_len)
793{
794 struct rdma_ucm_accept cmd;
795 struct rdma_conn_param conn_param;
796 struct ucma_context *ctx;
797 int ret;
798
799 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
800 return -EFAULT;
801
802 ctx = ucma_get_ctx(file, cmd.id);
803 if (IS_ERR(ctx))
804 return PTR_ERR(ctx);
805
806 if (cmd.conn_param.valid) {
807 ctx->uid = cmd.uid;
808 ucma_copy_conn_param(&conn_param, &cmd.conn_param);
809 ret = rdma_accept(ctx->cm_id, &conn_param);
810 } else
811 ret = rdma_accept(ctx->cm_id, NULL);
812
813 ucma_put_ctx(ctx);
814 return ret;
815}
816
817static ssize_t ucma_reject(struct ucma_file *file, const char __user *inbuf,
818 int in_len, int out_len)
819{
820 struct rdma_ucm_reject cmd;
821 struct ucma_context *ctx;
822 int ret;
823
824 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
825 return -EFAULT;
826
827 ctx = ucma_get_ctx(file, cmd.id);
828 if (IS_ERR(ctx))
829 return PTR_ERR(ctx);
830
831 ret = rdma_reject(ctx->cm_id, cmd.private_data, cmd.private_data_len);
832 ucma_put_ctx(ctx);
833 return ret;
834}
835
836static ssize_t ucma_disconnect(struct ucma_file *file, const char __user *inbuf,
837 int in_len, int out_len)
838{
839 struct rdma_ucm_disconnect cmd;
840 struct ucma_context *ctx;
841 int ret;
842
843 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
844 return -EFAULT;
845
846 ctx = ucma_get_ctx(file, cmd.id);
847 if (IS_ERR(ctx))
848 return PTR_ERR(ctx);
849
850 ret = rdma_disconnect(ctx->cm_id);
851 ucma_put_ctx(ctx);
852 return ret;
853}
854
855static ssize_t ucma_init_qp_attr(struct ucma_file *file,
856 const char __user *inbuf,
857 int in_len, int out_len)
858{
859 struct rdma_ucm_init_qp_attr cmd;
860 struct ib_uverbs_qp_attr resp;
861 struct ucma_context *ctx;
862 struct ib_qp_attr qp_attr;
863 int ret;
864
865 if (out_len < sizeof(resp))
866 return -ENOSPC;
867
868 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
869 return -EFAULT;
870
871 ctx = ucma_get_ctx(file, cmd.id);
872 if (IS_ERR(ctx))
873 return PTR_ERR(ctx);
874
875 resp.qp_attr_mask = 0;
876 memset(&qp_attr, 0, sizeof qp_attr);
877 qp_attr.qp_state = cmd.qp_state;
878 ret = rdma_init_qp_attr(ctx->cm_id, &qp_attr, &resp.qp_attr_mask);
879 if (ret)
880 goto out;
881
882 ib_copy_qp_attr_to_user(&resp, &qp_attr);
883 if (copy_to_user((void __user *)(unsigned long)cmd.response,
884 &resp, sizeof(resp)))
885 ret = -EFAULT;
886
887out:
888 ucma_put_ctx(ctx);
889 return ret;
890}
891
892static int ucma_set_option_id(struct ucma_context *ctx, int optname,
893 void *optval, size_t optlen)
894{
895 int ret = 0;
896
897 switch (optname) {
898 case RDMA_OPTION_ID_TOS:
899 if (optlen != sizeof(u8)) {
900 ret = -EINVAL;
901 break;
902 }
903 rdma_set_service_type(ctx->cm_id, *((u8 *) optval));
904 break;
905 case RDMA_OPTION_ID_REUSEADDR:
906 if (optlen != sizeof(int)) {
907 ret = -EINVAL;
908 break;
909 }
910 ret = rdma_set_reuseaddr(ctx->cm_id, *((int *) optval) ? 1 : 0);
911 break;
912 default:
913 ret = -ENOSYS;
914 }
915
916 return ret;
917}
918
919static int ucma_set_ib_path(struct ucma_context *ctx,
920 struct ib_path_rec_data *path_data, size_t optlen)
921{
922 struct ib_sa_path_rec sa_path;
923 struct rdma_cm_event event;
924 int ret;
925
926 if (optlen % sizeof(*path_data))
927 return -EINVAL;
928
929 for (; optlen; optlen -= sizeof(*path_data), path_data++) {
930 if (path_data->flags == (IB_PATH_GMP | IB_PATH_PRIMARY |
931 IB_PATH_BIDIRECTIONAL))
932 break;
933 }
934
935 if (!optlen)
936 return -EINVAL;
937
938 ib_sa_unpack_path(path_data->path_rec, &sa_path);
939 ret = rdma_set_ib_paths(ctx->cm_id, &sa_path, 1);
940 if (ret)
941 return ret;
942
943 memset(&event, 0, sizeof event);
944 event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
945 return ucma_event_handler(ctx->cm_id, &event);
946}
947
948static int ucma_set_option_ib(struct ucma_context *ctx, int optname,
949 void *optval, size_t optlen)
950{
951 int ret;
952
953 switch (optname) {
954 case RDMA_OPTION_IB_PATH:
955 ret = ucma_set_ib_path(ctx, optval, optlen);
956 break;
957 default:
958 ret = -ENOSYS;
959 }
960
961 return ret;
962}
963
964static int ucma_set_option_level(struct ucma_context *ctx, int level,
965 int optname, void *optval, size_t optlen)
966{
967 int ret;
968
969 switch (level) {
970 case RDMA_OPTION_ID:
971 ret = ucma_set_option_id(ctx, optname, optval, optlen);
972 break;
973 case RDMA_OPTION_IB:
974 ret = ucma_set_option_ib(ctx, optname, optval, optlen);
975 break;
976 default:
977 ret = -ENOSYS;
978 }
979
980 return ret;
981}
982
983static ssize_t ucma_set_option(struct ucma_file *file, const char __user *inbuf,
984 int in_len, int out_len)
985{
986 struct rdma_ucm_set_option cmd;
987 struct ucma_context *ctx;
988 void *optval;
989 int ret;
990
991 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
992 return -EFAULT;
993
994 ctx = ucma_get_ctx(file, cmd.id);
995 if (IS_ERR(ctx))
996 return PTR_ERR(ctx);
997
998 optval = kmalloc(cmd.optlen, GFP_KERNEL);
999 if (!optval) {
1000 ret = -ENOMEM;
1001 goto out1;
1002 }
1003
1004 if (copy_from_user(optval, (void __user *) (unsigned long) cmd.optval,
1005 cmd.optlen)) {
1006 ret = -EFAULT;
1007 goto out2;
1008 }
1009
1010 ret = ucma_set_option_level(ctx, cmd.level, cmd.optname, optval,
1011 cmd.optlen);
1012out2:
1013 kfree(optval);
1014out1:
1015 ucma_put_ctx(ctx);
1016 return ret;
1017}
1018
1019static ssize_t ucma_notify(struct ucma_file *file, const char __user *inbuf,
1020 int in_len, int out_len)
1021{
1022 struct rdma_ucm_notify cmd;
1023 struct ucma_context *ctx;
1024 int ret;
1025
1026 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1027 return -EFAULT;
1028
1029 ctx = ucma_get_ctx(file, cmd.id);
1030 if (IS_ERR(ctx))
1031 return PTR_ERR(ctx);
1032
1033 ret = rdma_notify(ctx->cm_id, (enum ib_event_type) cmd.event);
1034 ucma_put_ctx(ctx);
1035 return ret;
1036}
1037
1038static ssize_t ucma_join_multicast(struct ucma_file *file,
1039 const char __user *inbuf,
1040 int in_len, int out_len)
1041{
1042 struct rdma_ucm_join_mcast cmd;
1043 struct rdma_ucm_create_id_resp resp;
1044 struct ucma_context *ctx;
1045 struct ucma_multicast *mc;
1046 int ret;
1047
1048 if (out_len < sizeof(resp))
1049 return -ENOSPC;
1050
1051 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1052 return -EFAULT;
1053
1054 ctx = ucma_get_ctx(file, cmd.id);
1055 if (IS_ERR(ctx))
1056 return PTR_ERR(ctx);
1057
1058 mutex_lock(&file->mut);
1059 mc = ucma_alloc_multicast(ctx);
1060 if (!mc) {
1061 ret = -ENOMEM;
1062 goto err1;
1063 }
1064
1065 mc->uid = cmd.uid;
1066 memcpy(&mc->addr, &cmd.addr, sizeof cmd.addr);
1067 ret = rdma_join_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr, mc);
1068 if (ret)
1069 goto err2;
1070
1071 resp.id = mc->id;
1072 if (copy_to_user((void __user *)(unsigned long)cmd.response,
1073 &resp, sizeof(resp))) {
1074 ret = -EFAULT;
1075 goto err3;
1076 }
1077
1078 mutex_unlock(&file->mut);
1079 ucma_put_ctx(ctx);
1080 return 0;
1081
1082err3:
1083 rdma_leave_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr);
1084 ucma_cleanup_mc_events(mc);
1085err2:
1086 mutex_lock(&mut);
1087 idr_remove(&multicast_idr, mc->id);
1088 mutex_unlock(&mut);
1089 list_del(&mc->list);
1090 kfree(mc);
1091err1:
1092 mutex_unlock(&file->mut);
1093 ucma_put_ctx(ctx);
1094 return ret;
1095}
1096
1097static ssize_t ucma_leave_multicast(struct ucma_file *file,
1098 const char __user *inbuf,
1099 int in_len, int out_len)
1100{
1101 struct rdma_ucm_destroy_id cmd;
1102 struct rdma_ucm_destroy_id_resp resp;
1103 struct ucma_multicast *mc;
1104 int ret = 0;
1105
1106 if (out_len < sizeof(resp))
1107 return -ENOSPC;
1108
1109 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1110 return -EFAULT;
1111
1112 mutex_lock(&mut);
1113 mc = idr_find(&multicast_idr, cmd.id);
1114 if (!mc)
1115 mc = ERR_PTR(-ENOENT);
1116 else if (mc->ctx->file != file)
1117 mc = ERR_PTR(-EINVAL);
1118 else {
1119 idr_remove(&multicast_idr, mc->id);
1120 atomic_inc(&mc->ctx->ref);
1121 }
1122 mutex_unlock(&mut);
1123
1124 if (IS_ERR(mc)) {
1125 ret = PTR_ERR(mc);
1126 goto out;
1127 }
1128
1129 rdma_leave_multicast(mc->ctx->cm_id, (struct sockaddr *) &mc->addr);
1130 mutex_lock(&mc->ctx->file->mut);
1131 ucma_cleanup_mc_events(mc);
1132 list_del(&mc->list);
1133 mutex_unlock(&mc->ctx->file->mut);
1134
1135 ucma_put_ctx(mc->ctx);
1136 resp.events_reported = mc->events_reported;
1137 kfree(mc);
1138
1139 if (copy_to_user((void __user *)(unsigned long)cmd.response,
1140 &resp, sizeof(resp)))
1141 ret = -EFAULT;
1142out:
1143 return ret;
1144}
1145
1146static void ucma_lock_files(struct ucma_file *file1, struct ucma_file *file2)
1147{
1148 /* Acquire mutex's based on pointer comparison to prevent deadlock. */
1149 if (file1 < file2) {
1150 mutex_lock(&file1->mut);
1151 mutex_lock(&file2->mut);
1152 } else {
1153 mutex_lock(&file2->mut);
1154 mutex_lock(&file1->mut);
1155 }
1156}
1157
1158static void ucma_unlock_files(struct ucma_file *file1, struct ucma_file *file2)
1159{
1160 if (file1 < file2) {
1161 mutex_unlock(&file2->mut);
1162 mutex_unlock(&file1->mut);
1163 } else {
1164 mutex_unlock(&file1->mut);
1165 mutex_unlock(&file2->mut);
1166 }
1167}
1168
1169static void ucma_move_events(struct ucma_context *ctx, struct ucma_file *file)
1170{
1171 struct ucma_event *uevent, *tmp;
1172
1173 list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list)
1174 if (uevent->ctx == ctx)
1175 list_move_tail(&uevent->list, &file->event_list);
1176}
1177
1178static ssize_t ucma_migrate_id(struct ucma_file *new_file,
1179 const char __user *inbuf,
1180 int in_len, int out_len)
1181{
1182 struct rdma_ucm_migrate_id cmd;
1183 struct rdma_ucm_migrate_resp resp;
1184 struct ucma_context *ctx;
1185 struct file *filp;
1186 struct ucma_file *cur_file;
1187 int ret = 0;
1188
1189 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1190 return -EFAULT;
1191
1192 /* Get current fd to protect against it being closed */
1193 filp = fget(cmd.fd);
1194 if (!filp)
1195 return -ENOENT;
1196
1197 /* Validate current fd and prevent destruction of id. */
1198 ctx = ucma_get_ctx(filp->private_data, cmd.id);
1199 if (IS_ERR(ctx)) {
1200 ret = PTR_ERR(ctx);
1201 goto file_put;
1202 }
1203
1204 cur_file = ctx->file;
1205 if (cur_file == new_file) {
1206 resp.events_reported = ctx->events_reported;
1207 goto response;
1208 }
1209
1210 /*
1211 * Migrate events between fd's, maintaining order, and avoiding new
1212 * events being added before existing events.
1213 */
1214 ucma_lock_files(cur_file, new_file);
1215 mutex_lock(&mut);
1216
1217 list_move_tail(&ctx->list, &new_file->ctx_list);
1218 ucma_move_events(ctx, new_file);
1219 ctx->file = new_file;
1220 resp.events_reported = ctx->events_reported;
1221
1222 mutex_unlock(&mut);
1223 ucma_unlock_files(cur_file, new_file);
1224
1225response:
1226 if (copy_to_user((void __user *)(unsigned long)cmd.response,
1227 &resp, sizeof(resp)))
1228 ret = -EFAULT;
1229
1230 ucma_put_ctx(ctx);
1231file_put:
1232 fput(filp);
1233 return ret;
1234}
1235
1236static ssize_t (*ucma_cmd_table[])(struct ucma_file *file,
1237 const char __user *inbuf,
1238 int in_len, int out_len) = {
1239 [RDMA_USER_CM_CMD_CREATE_ID] = ucma_create_id,
1240 [RDMA_USER_CM_CMD_DESTROY_ID] = ucma_destroy_id,
1241 [RDMA_USER_CM_CMD_BIND_ADDR] = ucma_bind_addr,
1242 [RDMA_USER_CM_CMD_RESOLVE_ADDR] = ucma_resolve_addr,
1243 [RDMA_USER_CM_CMD_RESOLVE_ROUTE]= ucma_resolve_route,
1244 [RDMA_USER_CM_CMD_QUERY_ROUTE] = ucma_query_route,
1245 [RDMA_USER_CM_CMD_CONNECT] = ucma_connect,
1246 [RDMA_USER_CM_CMD_LISTEN] = ucma_listen,
1247 [RDMA_USER_CM_CMD_ACCEPT] = ucma_accept,
1248 [RDMA_USER_CM_CMD_REJECT] = ucma_reject,
1249 [RDMA_USER_CM_CMD_DISCONNECT] = ucma_disconnect,
1250 [RDMA_USER_CM_CMD_INIT_QP_ATTR] = ucma_init_qp_attr,
1251 [RDMA_USER_CM_CMD_GET_EVENT] = ucma_get_event,
1252 [RDMA_USER_CM_CMD_GET_OPTION] = NULL,
1253 [RDMA_USER_CM_CMD_SET_OPTION] = ucma_set_option,
1254 [RDMA_USER_CM_CMD_NOTIFY] = ucma_notify,
1255 [RDMA_USER_CM_CMD_JOIN_MCAST] = ucma_join_multicast,
1256 [RDMA_USER_CM_CMD_LEAVE_MCAST] = ucma_leave_multicast,
1257 [RDMA_USER_CM_CMD_MIGRATE_ID] = ucma_migrate_id
1258};
1259
1260static ssize_t ucma_write(struct file *filp, const char __user *buf,
1261 size_t len, loff_t *pos)
1262{
1263 struct ucma_file *file = filp->private_data;
1264 struct rdma_ucm_cmd_hdr hdr;
1265 ssize_t ret;
1266
1267 if (len < sizeof(hdr))
1268 return -EINVAL;
1269
1270 if (copy_from_user(&hdr, buf, sizeof(hdr)))
1271 return -EFAULT;
1272
1273 if (hdr.cmd < 0 || hdr.cmd >= ARRAY_SIZE(ucma_cmd_table))
1274 return -EINVAL;
1275
1276 if (hdr.in + sizeof(hdr) > len)
1277 return -EINVAL;
1278
1279 if (!ucma_cmd_table[hdr.cmd])
1280 return -ENOSYS;
1281
1282 ret = ucma_cmd_table[hdr.cmd](file, buf + sizeof(hdr), hdr.in, hdr.out);
1283 if (!ret)
1284 ret = len;
1285
1286 return ret;
1287}
1288
1289static unsigned int ucma_poll(struct file *filp, struct poll_table_struct *wait)
1290{
1291 struct ucma_file *file = filp->private_data;
1292 unsigned int mask = 0;
1293
1294 poll_wait(filp, &file->poll_wait, wait);
1295
1296 if (!list_empty(&file->event_list))
1297 mask = POLLIN | POLLRDNORM;
1298
1299 return mask;
1300}
1301
1302/*
1303 * ucma_open() does not need the BKL:
1304 *
1305 * - no global state is referred to;
1306 * - there is no ioctl method to race against;
1307 * - no further module initialization is required for open to work
1308 * after the device is registered.
1309 */
1310static int ucma_open(struct inode *inode, struct file *filp)
1311{
1312 struct ucma_file *file;
1313
1314 file = kmalloc(sizeof *file, GFP_KERNEL);
1315 if (!file)
1316 return -ENOMEM;
1317
1318 INIT_LIST_HEAD(&file->event_list);
1319 INIT_LIST_HEAD(&file->ctx_list);
1320 init_waitqueue_head(&file->poll_wait);
1321 mutex_init(&file->mut);
1322
1323 filp->private_data = file;
1324 file->filp = filp;
1325
1326 return nonseekable_open(inode, filp);
1327}
1328
1329static int ucma_close(struct inode *inode, struct file *filp)
1330{
1331 struct ucma_file *file = filp->private_data;
1332 struct ucma_context *ctx, *tmp;
1333
1334 mutex_lock(&file->mut);
1335 list_for_each_entry_safe(ctx, tmp, &file->ctx_list, list) {
1336 mutex_unlock(&file->mut);
1337
1338 mutex_lock(&mut);
1339 idr_remove(&ctx_idr, ctx->id);
1340 mutex_unlock(&mut);
1341
1342 ucma_free_ctx(ctx);
1343 mutex_lock(&file->mut);
1344 }
1345 mutex_unlock(&file->mut);
1346 kfree(file);
1347 return 0;
1348}
1349
1350static const struct file_operations ucma_fops = {
1351 .owner = THIS_MODULE,
1352 .open = ucma_open,
1353 .release = ucma_close,
1354 .write = ucma_write,
1355 .poll = ucma_poll,
1356 .llseek = no_llseek,
1357};
1358
1359static struct miscdevice ucma_misc = {
1360 .minor = MISC_DYNAMIC_MINOR,
1361 .name = "rdma_cm",
1362 .nodename = "infiniband/rdma_cm",
1363 .mode = 0666,
1364 .fops = &ucma_fops,
1365};
1366
1367static ssize_t show_abi_version(struct device *dev,
1368 struct device_attribute *attr,
1369 char *buf)
1370{
1371 return sprintf(buf, "%d\n", RDMA_USER_CM_ABI_VERSION);
1372}
1373static DEVICE_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
1374
1375static int __init ucma_init(void)
1376{
1377 int ret;
1378
1379 ret = misc_register(&ucma_misc);
1380 if (ret)
1381 return ret;
1382
1383 ret = device_create_file(ucma_misc.this_device, &dev_attr_abi_version);
1384 if (ret) {
1385 printk(KERN_ERR "rdma_ucm: couldn't create abi_version attr\n");
1386 goto err1;
1387 }
1388
1389 ucma_ctl_table_hdr = register_sysctl_paths(ucma_ctl_path, ucma_ctl_table);
1390 if (!ucma_ctl_table_hdr) {
1391 printk(KERN_ERR "rdma_ucm: couldn't register sysctl paths\n");
1392 ret = -ENOMEM;
1393 goto err2;
1394 }
1395 return 0;
1396err2:
1397 device_remove_file(ucma_misc.this_device, &dev_attr_abi_version);
1398err1:
1399 misc_deregister(&ucma_misc);
1400 return ret;
1401}
1402
1403static void __exit ucma_cleanup(void)
1404{
1405 unregister_sysctl_table(ucma_ctl_table_hdr);
1406 device_remove_file(ucma_misc.this_device, &dev_attr_abi_version);
1407 misc_deregister(&ucma_misc);
1408 idr_destroy(&ctx_idr);
1409}
1410
1411module_init(ucma_init);
1412module_exit(ucma_cleanup);
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
53MODULE_AUTHOR("Sean Hefty");
54MODULE_DESCRIPTION("RDMA Userspace Connection Manager Access");
55MODULE_LICENSE("Dual BSD/GPL");
56
57static unsigned int max_backlog = 1024;
58
59static struct ctl_table_header *ucma_ctl_table_hdr;
60static 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
71struct 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
79struct 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
94struct 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
104struct 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
112static DEFINE_MUTEX(mut);
113static DEFINE_IDR(ctx_idr);
114static DEFINE_IDR(multicast_idr);
115
116static 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
129static 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
141static void ucma_put_ctx(struct ucma_context *ctx)
142{
143 if (atomic_dec_and_test(&ctx->ref))
144 complete(&ctx->comp);
145}
146
147static 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
169error:
170 kfree(ctx);
171 return NULL;
172}
173
174static 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
192error:
193 kfree(mc);
194 return NULL;
195}
196
197static 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
213static 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
225static 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
245static 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);
287out:
288 mutex_unlock(&ctx->file->mut);
289 return ret;
290}
291
292static 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);
345done:
346 mutex_unlock(&file->mut);
347 return ret;
348}
349
350static 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
368static 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
408err2:
409 rdma_destroy_id(ctx->cm_id);
410err1:
411 mutex_lock(&mut);
412 idr_remove(&ctx_idr, ctx->id);
413 mutex_unlock(&mut);
414 kfree(ctx);
415 return ret;
416}
417
418static 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
431static 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 */
449static 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
481static 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
515static 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
534static 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
558static 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
580static 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
607static 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
627static 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
655static 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
681static 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
691static 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
746out:
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
755static 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
767static 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
795static 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
827static 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
873static 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
909static 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
925static 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
949static 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
970static 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
999static 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
1018static 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
1037static 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
1069out:
1070 ucma_put_ctx(ctx);
1071 return ret;
1072}
1073
1074static 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
1108static 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
1137static 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
1153static 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
1172static 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
1198out:
1199 ucma_put_ctx(ctx);
1200 return ret;
1201}
1202
1203static 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
1222static 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
1266err3:
1267 rdma_leave_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr);
1268 ucma_cleanup_mc_events(mc);
1269err2:
1270 mutex_lock(&mut);
1271 idr_remove(&multicast_idr, mc->id);
1272 mutex_unlock(&mut);
1273 list_del(&mc->list);
1274 kfree(mc);
1275err1:
1276 mutex_unlock(&file->mut);
1277 ucma_put_ctx(ctx);
1278 return ret;
1279}
1280
1281static 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
1301static 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
1313static 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;
1358out:
1359 return ret;
1360}
1361
1362static 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
1374static 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
1385static 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
1394static 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
1441response:
1442 if (copy_to_user((void __user *)(unsigned long)cmd.response,
1443 &resp, sizeof(resp)))
1444 ret = -EFAULT;
1445
1446 ucma_put_ctx(ctx);
1447file_put:
1448 fdput(f);
1449 return ret;
1450}
1451
1452static 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
1480static 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
1509static 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 */
1530static 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
1549static 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
1570static 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
1579static 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
1587static 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}
1593static DEVICE_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
1594
1595static 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;
1616err2:
1617 device_remove_file(ucma_misc.this_device, &dev_attr_abi_version);
1618err1:
1619 misc_deregister(&ucma_misc);
1620 return ret;
1621}
1622
1623static 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
1631module_init(ucma_init);
1632module_exit(ucma_cleanup);