Loading...
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#include <linux/nsproxy.h>
46
47#include <linux/nospec.h>
48
49#include <rdma/rdma_user_cm.h>
50#include <rdma/ib_marshall.h>
51#include <rdma/rdma_cm.h>
52#include <rdma/rdma_cm_ib.h>
53#include <rdma/ib_addr.h>
54#include <rdma/ib.h>
55#include <rdma/ib_cm.h>
56#include <rdma/rdma_netlink.h>
57#include "core_priv.h"
58
59MODULE_AUTHOR("Sean Hefty");
60MODULE_DESCRIPTION("RDMA Userspace Connection Manager Access");
61MODULE_LICENSE("Dual BSD/GPL");
62
63static unsigned int max_backlog = 1024;
64
65static struct ctl_table_header *ucma_ctl_table_hdr;
66static struct ctl_table ucma_ctl_table[] = {
67 {
68 .procname = "max_backlog",
69 .data = &max_backlog,
70 .maxlen = sizeof max_backlog,
71 .mode = 0644,
72 .proc_handler = proc_dointvec,
73 },
74};
75
76struct ucma_file {
77 struct mutex mut;
78 struct file *filp;
79 struct list_head ctx_list;
80 struct list_head event_list;
81 wait_queue_head_t poll_wait;
82};
83
84struct ucma_context {
85 u32 id;
86 struct completion comp;
87 refcount_t ref;
88 int events_reported;
89 atomic_t backlog;
90
91 struct ucma_file *file;
92 struct rdma_cm_id *cm_id;
93 struct mutex mutex;
94 u64 uid;
95
96 struct list_head list;
97 struct list_head mc_list;
98 struct work_struct close_work;
99};
100
101struct ucma_multicast {
102 struct ucma_context *ctx;
103 u32 id;
104 int events_reported;
105
106 u64 uid;
107 u8 join_state;
108 struct list_head list;
109 struct sockaddr_storage addr;
110};
111
112struct ucma_event {
113 struct ucma_context *ctx;
114 struct ucma_context *conn_req_ctx;
115 struct ucma_multicast *mc;
116 struct list_head list;
117 struct rdma_ucm_event_resp resp;
118};
119
120static DEFINE_XARRAY_ALLOC(ctx_table);
121static DEFINE_XARRAY_ALLOC(multicast_table);
122
123static const struct file_operations ucma_fops;
124static int ucma_destroy_private_ctx(struct ucma_context *ctx);
125
126static inline struct ucma_context *_ucma_find_context(int id,
127 struct ucma_file *file)
128{
129 struct ucma_context *ctx;
130
131 ctx = xa_load(&ctx_table, id);
132 if (!ctx)
133 ctx = ERR_PTR(-ENOENT);
134 else if (ctx->file != file)
135 ctx = ERR_PTR(-EINVAL);
136 return ctx;
137}
138
139static struct ucma_context *ucma_get_ctx(struct ucma_file *file, int id)
140{
141 struct ucma_context *ctx;
142
143 xa_lock(&ctx_table);
144 ctx = _ucma_find_context(id, file);
145 if (!IS_ERR(ctx))
146 if (!refcount_inc_not_zero(&ctx->ref))
147 ctx = ERR_PTR(-ENXIO);
148 xa_unlock(&ctx_table);
149 return ctx;
150}
151
152static void ucma_put_ctx(struct ucma_context *ctx)
153{
154 if (refcount_dec_and_test(&ctx->ref))
155 complete(&ctx->comp);
156}
157
158/*
159 * Same as ucm_get_ctx but requires that ->cm_id->device is valid, eg that the
160 * CM_ID is bound.
161 */
162static struct ucma_context *ucma_get_ctx_dev(struct ucma_file *file, int id)
163{
164 struct ucma_context *ctx = ucma_get_ctx(file, id);
165
166 if (IS_ERR(ctx))
167 return ctx;
168 if (!ctx->cm_id->device) {
169 ucma_put_ctx(ctx);
170 return ERR_PTR(-EINVAL);
171 }
172 return ctx;
173}
174
175static void ucma_close_id(struct work_struct *work)
176{
177 struct ucma_context *ctx = container_of(work, struct ucma_context, close_work);
178
179 /* once all inflight tasks are finished, we close all underlying
180 * resources. The context is still alive till its explicit destryoing
181 * by its creator. This puts back the xarray's reference.
182 */
183 ucma_put_ctx(ctx);
184 wait_for_completion(&ctx->comp);
185 /* No new events will be generated after destroying the id. */
186 rdma_destroy_id(ctx->cm_id);
187
188 /* Reading the cm_id without holding a positive ref is not allowed */
189 ctx->cm_id = NULL;
190}
191
192static struct ucma_context *ucma_alloc_ctx(struct ucma_file *file)
193{
194 struct ucma_context *ctx;
195
196 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
197 if (!ctx)
198 return NULL;
199
200 INIT_WORK(&ctx->close_work, ucma_close_id);
201 init_completion(&ctx->comp);
202 INIT_LIST_HEAD(&ctx->mc_list);
203 /* So list_del() will work if we don't do ucma_finish_ctx() */
204 INIT_LIST_HEAD(&ctx->list);
205 ctx->file = file;
206 mutex_init(&ctx->mutex);
207
208 if (xa_alloc(&ctx_table, &ctx->id, NULL, xa_limit_32b, GFP_KERNEL)) {
209 kfree(ctx);
210 return NULL;
211 }
212 return ctx;
213}
214
215static void ucma_set_ctx_cm_id(struct ucma_context *ctx,
216 struct rdma_cm_id *cm_id)
217{
218 refcount_set(&ctx->ref, 1);
219 ctx->cm_id = cm_id;
220}
221
222static void ucma_finish_ctx(struct ucma_context *ctx)
223{
224 lockdep_assert_held(&ctx->file->mut);
225 list_add_tail(&ctx->list, &ctx->file->ctx_list);
226 xa_store(&ctx_table, ctx->id, ctx, GFP_KERNEL);
227}
228
229static void ucma_copy_conn_event(struct rdma_ucm_conn_param *dst,
230 struct rdma_conn_param *src)
231{
232 if (src->private_data_len)
233 memcpy(dst->private_data, src->private_data,
234 src->private_data_len);
235 dst->private_data_len = src->private_data_len;
236 dst->responder_resources = src->responder_resources;
237 dst->initiator_depth = src->initiator_depth;
238 dst->flow_control = src->flow_control;
239 dst->retry_count = src->retry_count;
240 dst->rnr_retry_count = src->rnr_retry_count;
241 dst->srq = src->srq;
242 dst->qp_num = src->qp_num;
243}
244
245static void ucma_copy_ud_event(struct ib_device *device,
246 struct rdma_ucm_ud_param *dst,
247 struct rdma_ud_param *src)
248{
249 if (src->private_data_len)
250 memcpy(dst->private_data, src->private_data,
251 src->private_data_len);
252 dst->private_data_len = src->private_data_len;
253 ib_copy_ah_attr_to_user(device, &dst->ah_attr, &src->ah_attr);
254 dst->qp_num = src->qp_num;
255 dst->qkey = src->qkey;
256}
257
258static struct ucma_event *ucma_create_uevent(struct ucma_context *ctx,
259 struct rdma_cm_event *event)
260{
261 struct ucma_event *uevent;
262
263 uevent = kzalloc(sizeof(*uevent), GFP_KERNEL);
264 if (!uevent)
265 return NULL;
266
267 uevent->ctx = ctx;
268 switch (event->event) {
269 case RDMA_CM_EVENT_MULTICAST_JOIN:
270 case RDMA_CM_EVENT_MULTICAST_ERROR:
271 uevent->mc = (struct ucma_multicast *)
272 event->param.ud.private_data;
273 uevent->resp.uid = uevent->mc->uid;
274 uevent->resp.id = uevent->mc->id;
275 break;
276 default:
277 uevent->resp.uid = ctx->uid;
278 uevent->resp.id = ctx->id;
279 break;
280 }
281 uevent->resp.event = event->event;
282 uevent->resp.status = event->status;
283 if (ctx->cm_id->qp_type == IB_QPT_UD)
284 ucma_copy_ud_event(ctx->cm_id->device, &uevent->resp.param.ud,
285 &event->param.ud);
286 else
287 ucma_copy_conn_event(&uevent->resp.param.conn,
288 &event->param.conn);
289
290 uevent->resp.ece.vendor_id = event->ece.vendor_id;
291 uevent->resp.ece.attr_mod = event->ece.attr_mod;
292 return uevent;
293}
294
295static int ucma_connect_event_handler(struct rdma_cm_id *cm_id,
296 struct rdma_cm_event *event)
297{
298 struct ucma_context *listen_ctx = cm_id->context;
299 struct ucma_context *ctx;
300 struct ucma_event *uevent;
301
302 if (!atomic_add_unless(&listen_ctx->backlog, -1, 0))
303 return -ENOMEM;
304 ctx = ucma_alloc_ctx(listen_ctx->file);
305 if (!ctx)
306 goto err_backlog;
307 ucma_set_ctx_cm_id(ctx, cm_id);
308
309 uevent = ucma_create_uevent(listen_ctx, event);
310 if (!uevent)
311 goto err_alloc;
312 uevent->conn_req_ctx = ctx;
313 uevent->resp.id = ctx->id;
314
315 ctx->cm_id->context = ctx;
316
317 mutex_lock(&ctx->file->mut);
318 ucma_finish_ctx(ctx);
319 list_add_tail(&uevent->list, &ctx->file->event_list);
320 mutex_unlock(&ctx->file->mut);
321 wake_up_interruptible(&ctx->file->poll_wait);
322 return 0;
323
324err_alloc:
325 ucma_destroy_private_ctx(ctx);
326err_backlog:
327 atomic_inc(&listen_ctx->backlog);
328 /* Returning error causes the new ID to be destroyed */
329 return -ENOMEM;
330}
331
332static int ucma_event_handler(struct rdma_cm_id *cm_id,
333 struct rdma_cm_event *event)
334{
335 struct ucma_event *uevent;
336 struct ucma_context *ctx = cm_id->context;
337
338 if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST)
339 return ucma_connect_event_handler(cm_id, event);
340
341 /*
342 * We ignore events for new connections until userspace has set their
343 * context. This can only happen if an error occurs on a new connection
344 * before the user accepts it. This is okay, since the accept will just
345 * fail later. However, we do need to release the underlying HW
346 * resources in case of a device removal event.
347 */
348 if (ctx->uid) {
349 uevent = ucma_create_uevent(ctx, event);
350 if (!uevent)
351 return 0;
352
353 mutex_lock(&ctx->file->mut);
354 list_add_tail(&uevent->list, &ctx->file->event_list);
355 mutex_unlock(&ctx->file->mut);
356 wake_up_interruptible(&ctx->file->poll_wait);
357 }
358
359 if (event->event == RDMA_CM_EVENT_DEVICE_REMOVAL) {
360 xa_lock(&ctx_table);
361 if (xa_load(&ctx_table, ctx->id) == ctx)
362 queue_work(system_unbound_wq, &ctx->close_work);
363 xa_unlock(&ctx_table);
364 }
365 return 0;
366}
367
368static ssize_t ucma_get_event(struct ucma_file *file, const char __user *inbuf,
369 int in_len, int out_len)
370{
371 struct rdma_ucm_get_event cmd;
372 struct ucma_event *uevent;
373
374 /*
375 * Old 32 bit user space does not send the 4 byte padding in the
376 * reserved field. We don't care, allow it to keep working.
377 */
378 if (out_len < sizeof(uevent->resp) - sizeof(uevent->resp.reserved) -
379 sizeof(uevent->resp.ece))
380 return -ENOSPC;
381
382 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
383 return -EFAULT;
384
385 mutex_lock(&file->mut);
386 while (list_empty(&file->event_list)) {
387 mutex_unlock(&file->mut);
388
389 if (file->filp->f_flags & O_NONBLOCK)
390 return -EAGAIN;
391
392 if (wait_event_interruptible(file->poll_wait,
393 !list_empty(&file->event_list)))
394 return -ERESTARTSYS;
395
396 mutex_lock(&file->mut);
397 }
398
399 uevent = list_first_entry(&file->event_list, struct ucma_event, list);
400
401 if (copy_to_user(u64_to_user_ptr(cmd.response),
402 &uevent->resp,
403 min_t(size_t, out_len, sizeof(uevent->resp)))) {
404 mutex_unlock(&file->mut);
405 return -EFAULT;
406 }
407
408 list_del(&uevent->list);
409 uevent->ctx->events_reported++;
410 if (uevent->mc)
411 uevent->mc->events_reported++;
412 if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST)
413 atomic_inc(&uevent->ctx->backlog);
414 mutex_unlock(&file->mut);
415
416 kfree(uevent);
417 return 0;
418}
419
420static int ucma_get_qp_type(struct rdma_ucm_create_id *cmd, enum ib_qp_type *qp_type)
421{
422 switch (cmd->ps) {
423 case RDMA_PS_TCP:
424 *qp_type = IB_QPT_RC;
425 return 0;
426 case RDMA_PS_UDP:
427 case RDMA_PS_IPOIB:
428 *qp_type = IB_QPT_UD;
429 return 0;
430 case RDMA_PS_IB:
431 *qp_type = cmd->qp_type;
432 return 0;
433 default:
434 return -EINVAL;
435 }
436}
437
438static ssize_t ucma_create_id(struct ucma_file *file, const char __user *inbuf,
439 int in_len, int out_len)
440{
441 struct rdma_ucm_create_id cmd;
442 struct rdma_ucm_create_id_resp resp;
443 struct ucma_context *ctx;
444 struct rdma_cm_id *cm_id;
445 enum ib_qp_type qp_type;
446 int ret;
447
448 if (out_len < sizeof(resp))
449 return -ENOSPC;
450
451 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
452 return -EFAULT;
453
454 ret = ucma_get_qp_type(&cmd, &qp_type);
455 if (ret)
456 return ret;
457
458 ctx = ucma_alloc_ctx(file);
459 if (!ctx)
460 return -ENOMEM;
461
462 ctx->uid = cmd.uid;
463 cm_id = rdma_create_user_id(ucma_event_handler, ctx, cmd.ps, qp_type);
464 if (IS_ERR(cm_id)) {
465 ret = PTR_ERR(cm_id);
466 goto err1;
467 }
468 ucma_set_ctx_cm_id(ctx, cm_id);
469
470 resp.id = ctx->id;
471 if (copy_to_user(u64_to_user_ptr(cmd.response),
472 &resp, sizeof(resp))) {
473 ret = -EFAULT;
474 goto err1;
475 }
476
477 mutex_lock(&file->mut);
478 ucma_finish_ctx(ctx);
479 mutex_unlock(&file->mut);
480 return 0;
481
482err1:
483 ucma_destroy_private_ctx(ctx);
484 return ret;
485}
486
487static void ucma_cleanup_multicast(struct ucma_context *ctx)
488{
489 struct ucma_multicast *mc, *tmp;
490
491 xa_lock(&multicast_table);
492 list_for_each_entry_safe(mc, tmp, &ctx->mc_list, list) {
493 list_del(&mc->list);
494 /*
495 * At this point mc->ctx->ref is 0 so the mc cannot leave the
496 * lock on the reader and this is enough serialization
497 */
498 __xa_erase(&multicast_table, mc->id);
499 kfree(mc);
500 }
501 xa_unlock(&multicast_table);
502}
503
504static void ucma_cleanup_mc_events(struct ucma_multicast *mc)
505{
506 struct ucma_event *uevent, *tmp;
507
508 rdma_lock_handler(mc->ctx->cm_id);
509 mutex_lock(&mc->ctx->file->mut);
510 list_for_each_entry_safe(uevent, tmp, &mc->ctx->file->event_list, list) {
511 if (uevent->mc != mc)
512 continue;
513
514 list_del(&uevent->list);
515 kfree(uevent);
516 }
517 mutex_unlock(&mc->ctx->file->mut);
518 rdma_unlock_handler(mc->ctx->cm_id);
519}
520
521static int ucma_cleanup_ctx_events(struct ucma_context *ctx)
522{
523 int events_reported;
524 struct ucma_event *uevent, *tmp;
525 LIST_HEAD(list);
526
527 /* Cleanup events not yet reported to the user.*/
528 mutex_lock(&ctx->file->mut);
529 list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list) {
530 if (uevent->ctx != ctx)
531 continue;
532
533 if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST &&
534 xa_cmpxchg(&ctx_table, uevent->conn_req_ctx->id,
535 uevent->conn_req_ctx, XA_ZERO_ENTRY,
536 GFP_KERNEL) == uevent->conn_req_ctx) {
537 list_move_tail(&uevent->list, &list);
538 continue;
539 }
540 list_del(&uevent->list);
541 kfree(uevent);
542 }
543 list_del(&ctx->list);
544 events_reported = ctx->events_reported;
545 mutex_unlock(&ctx->file->mut);
546
547 /*
548 * If this was a listening ID then any connections spawned from it that
549 * have not been delivered to userspace are cleaned up too. Must be done
550 * outside any locks.
551 */
552 list_for_each_entry_safe(uevent, tmp, &list, list) {
553 ucma_destroy_private_ctx(uevent->conn_req_ctx);
554 kfree(uevent);
555 }
556 return events_reported;
557}
558
559/*
560 * When this is called the xarray must have a XA_ZERO_ENTRY in the ctx->id (ie
561 * the ctx is not public to the user). This either because:
562 * - ucma_finish_ctx() hasn't been called
563 * - xa_cmpxchg() succeed to remove the entry (only one thread can succeed)
564 */
565static int ucma_destroy_private_ctx(struct ucma_context *ctx)
566{
567 int events_reported;
568
569 /*
570 * Destroy the underlying cm_id. New work queuing is prevented now by
571 * the removal from the xarray. Once the work is cancled ref will either
572 * be 0 because the work ran to completion and consumed the ref from the
573 * xarray, or it will be positive because we still have the ref from the
574 * xarray. This can also be 0 in cases where cm_id was never set
575 */
576 cancel_work_sync(&ctx->close_work);
577 if (refcount_read(&ctx->ref))
578 ucma_close_id(&ctx->close_work);
579
580 events_reported = ucma_cleanup_ctx_events(ctx);
581 ucma_cleanup_multicast(ctx);
582
583 WARN_ON(xa_cmpxchg(&ctx_table, ctx->id, XA_ZERO_ENTRY, NULL,
584 GFP_KERNEL) != NULL);
585 mutex_destroy(&ctx->mutex);
586 kfree(ctx);
587 return events_reported;
588}
589
590static ssize_t ucma_destroy_id(struct ucma_file *file, const char __user *inbuf,
591 int in_len, int out_len)
592{
593 struct rdma_ucm_destroy_id cmd;
594 struct rdma_ucm_destroy_id_resp resp;
595 struct ucma_context *ctx;
596 int ret = 0;
597
598 if (out_len < sizeof(resp))
599 return -ENOSPC;
600
601 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
602 return -EFAULT;
603
604 xa_lock(&ctx_table);
605 ctx = _ucma_find_context(cmd.id, file);
606 if (!IS_ERR(ctx)) {
607 if (__xa_cmpxchg(&ctx_table, ctx->id, ctx, XA_ZERO_ENTRY,
608 GFP_KERNEL) != ctx)
609 ctx = ERR_PTR(-ENOENT);
610 }
611 xa_unlock(&ctx_table);
612
613 if (IS_ERR(ctx))
614 return PTR_ERR(ctx);
615
616 resp.events_reported = ucma_destroy_private_ctx(ctx);
617 if (copy_to_user(u64_to_user_ptr(cmd.response),
618 &resp, sizeof(resp)))
619 ret = -EFAULT;
620
621 return ret;
622}
623
624static ssize_t ucma_bind_ip(struct ucma_file *file, const char __user *inbuf,
625 int in_len, int out_len)
626{
627 struct rdma_ucm_bind_ip cmd;
628 struct ucma_context *ctx;
629 int ret;
630
631 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
632 return -EFAULT;
633
634 if (!rdma_addr_size_in6(&cmd.addr))
635 return -EINVAL;
636
637 ctx = ucma_get_ctx(file, cmd.id);
638 if (IS_ERR(ctx))
639 return PTR_ERR(ctx);
640
641 mutex_lock(&ctx->mutex);
642 ret = rdma_bind_addr(ctx->cm_id, (struct sockaddr *) &cmd.addr);
643 mutex_unlock(&ctx->mutex);
644
645 ucma_put_ctx(ctx);
646 return ret;
647}
648
649static ssize_t ucma_bind(struct ucma_file *file, const char __user *inbuf,
650 int in_len, int out_len)
651{
652 struct rdma_ucm_bind cmd;
653 struct ucma_context *ctx;
654 int ret;
655
656 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
657 return -EFAULT;
658
659 if (cmd.reserved || !cmd.addr_size ||
660 cmd.addr_size != rdma_addr_size_kss(&cmd.addr))
661 return -EINVAL;
662
663 ctx = ucma_get_ctx(file, cmd.id);
664 if (IS_ERR(ctx))
665 return PTR_ERR(ctx);
666
667 mutex_lock(&ctx->mutex);
668 ret = rdma_bind_addr(ctx->cm_id, (struct sockaddr *) &cmd.addr);
669 mutex_unlock(&ctx->mutex);
670 ucma_put_ctx(ctx);
671 return ret;
672}
673
674static ssize_t ucma_resolve_ip(struct ucma_file *file,
675 const char __user *inbuf,
676 int in_len, int out_len)
677{
678 struct rdma_ucm_resolve_ip cmd;
679 struct ucma_context *ctx;
680 int ret;
681
682 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
683 return -EFAULT;
684
685 if ((cmd.src_addr.sin6_family && !rdma_addr_size_in6(&cmd.src_addr)) ||
686 !rdma_addr_size_in6(&cmd.dst_addr))
687 return -EINVAL;
688
689 ctx = ucma_get_ctx(file, cmd.id);
690 if (IS_ERR(ctx))
691 return PTR_ERR(ctx);
692
693 mutex_lock(&ctx->mutex);
694 ret = rdma_resolve_addr(ctx->cm_id, (struct sockaddr *) &cmd.src_addr,
695 (struct sockaddr *) &cmd.dst_addr, cmd.timeout_ms);
696 mutex_unlock(&ctx->mutex);
697 ucma_put_ctx(ctx);
698 return ret;
699}
700
701static ssize_t ucma_resolve_addr(struct ucma_file *file,
702 const char __user *inbuf,
703 int in_len, int out_len)
704{
705 struct rdma_ucm_resolve_addr cmd;
706 struct ucma_context *ctx;
707 int ret;
708
709 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
710 return -EFAULT;
711
712 if (cmd.reserved ||
713 (cmd.src_size && (cmd.src_size != rdma_addr_size_kss(&cmd.src_addr))) ||
714 !cmd.dst_size || (cmd.dst_size != rdma_addr_size_kss(&cmd.dst_addr)))
715 return -EINVAL;
716
717 ctx = ucma_get_ctx(file, cmd.id);
718 if (IS_ERR(ctx))
719 return PTR_ERR(ctx);
720
721 mutex_lock(&ctx->mutex);
722 ret = rdma_resolve_addr(ctx->cm_id, (struct sockaddr *) &cmd.src_addr,
723 (struct sockaddr *) &cmd.dst_addr, cmd.timeout_ms);
724 mutex_unlock(&ctx->mutex);
725 ucma_put_ctx(ctx);
726 return ret;
727}
728
729static ssize_t ucma_resolve_route(struct ucma_file *file,
730 const char __user *inbuf,
731 int in_len, int out_len)
732{
733 struct rdma_ucm_resolve_route cmd;
734 struct ucma_context *ctx;
735 int ret;
736
737 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
738 return -EFAULT;
739
740 ctx = ucma_get_ctx_dev(file, cmd.id);
741 if (IS_ERR(ctx))
742 return PTR_ERR(ctx);
743
744 mutex_lock(&ctx->mutex);
745 ret = rdma_resolve_route(ctx->cm_id, cmd.timeout_ms);
746 mutex_unlock(&ctx->mutex);
747 ucma_put_ctx(ctx);
748 return ret;
749}
750
751static void ucma_copy_ib_route(struct rdma_ucm_query_route_resp *resp,
752 struct rdma_route *route)
753{
754 struct rdma_dev_addr *dev_addr;
755
756 resp->num_paths = route->num_pri_alt_paths;
757 switch (route->num_pri_alt_paths) {
758 case 0:
759 dev_addr = &route->addr.dev_addr;
760 rdma_addr_get_dgid(dev_addr,
761 (union ib_gid *) &resp->ib_route[0].dgid);
762 rdma_addr_get_sgid(dev_addr,
763 (union ib_gid *) &resp->ib_route[0].sgid);
764 resp->ib_route[0].pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
765 break;
766 case 2:
767 ib_copy_path_rec_to_user(&resp->ib_route[1],
768 &route->path_rec[1]);
769 fallthrough;
770 case 1:
771 ib_copy_path_rec_to_user(&resp->ib_route[0],
772 &route->path_rec[0]);
773 break;
774 default:
775 break;
776 }
777}
778
779static void ucma_copy_iboe_route(struct rdma_ucm_query_route_resp *resp,
780 struct rdma_route *route)
781{
782
783 resp->num_paths = route->num_pri_alt_paths;
784 switch (route->num_pri_alt_paths) {
785 case 0:
786 rdma_ip2gid((struct sockaddr *)&route->addr.dst_addr,
787 (union ib_gid *)&resp->ib_route[0].dgid);
788 rdma_ip2gid((struct sockaddr *)&route->addr.src_addr,
789 (union ib_gid *)&resp->ib_route[0].sgid);
790 resp->ib_route[0].pkey = cpu_to_be16(0xffff);
791 break;
792 case 2:
793 ib_copy_path_rec_to_user(&resp->ib_route[1],
794 &route->path_rec[1]);
795 fallthrough;
796 case 1:
797 ib_copy_path_rec_to_user(&resp->ib_route[0],
798 &route->path_rec[0]);
799 break;
800 default:
801 break;
802 }
803}
804
805static void ucma_copy_iw_route(struct rdma_ucm_query_route_resp *resp,
806 struct rdma_route *route)
807{
808 struct rdma_dev_addr *dev_addr;
809
810 dev_addr = &route->addr.dev_addr;
811 rdma_addr_get_dgid(dev_addr, (union ib_gid *) &resp->ib_route[0].dgid);
812 rdma_addr_get_sgid(dev_addr, (union ib_gid *) &resp->ib_route[0].sgid);
813}
814
815static ssize_t ucma_query_route(struct ucma_file *file,
816 const char __user *inbuf,
817 int in_len, int out_len)
818{
819 struct rdma_ucm_query cmd;
820 struct rdma_ucm_query_route_resp resp;
821 struct ucma_context *ctx;
822 struct sockaddr *addr;
823 int ret = 0;
824
825 if (out_len < offsetof(struct rdma_ucm_query_route_resp, ibdev_index))
826 return -ENOSPC;
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 mutex_lock(&ctx->mutex);
836 memset(&resp, 0, sizeof resp);
837 addr = (struct sockaddr *) &ctx->cm_id->route.addr.src_addr;
838 memcpy(&resp.src_addr, addr, addr->sa_family == AF_INET ?
839 sizeof(struct sockaddr_in) :
840 sizeof(struct sockaddr_in6));
841 addr = (struct sockaddr *) &ctx->cm_id->route.addr.dst_addr;
842 memcpy(&resp.dst_addr, addr, addr->sa_family == AF_INET ?
843 sizeof(struct sockaddr_in) :
844 sizeof(struct sockaddr_in6));
845 if (!ctx->cm_id->device)
846 goto out;
847
848 resp.node_guid = (__force __u64) ctx->cm_id->device->node_guid;
849 resp.ibdev_index = ctx->cm_id->device->index;
850 resp.port_num = ctx->cm_id->port_num;
851
852 if (rdma_cap_ib_sa(ctx->cm_id->device, ctx->cm_id->port_num))
853 ucma_copy_ib_route(&resp, &ctx->cm_id->route);
854 else if (rdma_protocol_roce(ctx->cm_id->device, ctx->cm_id->port_num))
855 ucma_copy_iboe_route(&resp, &ctx->cm_id->route);
856 else if (rdma_protocol_iwarp(ctx->cm_id->device, ctx->cm_id->port_num))
857 ucma_copy_iw_route(&resp, &ctx->cm_id->route);
858
859out:
860 mutex_unlock(&ctx->mutex);
861 if (copy_to_user(u64_to_user_ptr(cmd.response), &resp,
862 min_t(size_t, out_len, sizeof(resp))))
863 ret = -EFAULT;
864
865 ucma_put_ctx(ctx);
866 return ret;
867}
868
869static void ucma_query_device_addr(struct rdma_cm_id *cm_id,
870 struct rdma_ucm_query_addr_resp *resp)
871{
872 if (!cm_id->device)
873 return;
874
875 resp->node_guid = (__force __u64) cm_id->device->node_guid;
876 resp->ibdev_index = cm_id->device->index;
877 resp->port_num = cm_id->port_num;
878 resp->pkey = (__force __u16) cpu_to_be16(
879 ib_addr_get_pkey(&cm_id->route.addr.dev_addr));
880}
881
882static ssize_t ucma_query_addr(struct ucma_context *ctx,
883 void __user *response, int out_len)
884{
885 struct rdma_ucm_query_addr_resp resp;
886 struct sockaddr *addr;
887 int ret = 0;
888
889 if (out_len < offsetof(struct rdma_ucm_query_addr_resp, ibdev_index))
890 return -ENOSPC;
891
892 memset(&resp, 0, sizeof resp);
893
894 addr = (struct sockaddr *) &ctx->cm_id->route.addr.src_addr;
895 resp.src_size = rdma_addr_size(addr);
896 memcpy(&resp.src_addr, addr, resp.src_size);
897
898 addr = (struct sockaddr *) &ctx->cm_id->route.addr.dst_addr;
899 resp.dst_size = rdma_addr_size(addr);
900 memcpy(&resp.dst_addr, addr, resp.dst_size);
901
902 ucma_query_device_addr(ctx->cm_id, &resp);
903
904 if (copy_to_user(response, &resp, min_t(size_t, out_len, sizeof(resp))))
905 ret = -EFAULT;
906
907 return ret;
908}
909
910static ssize_t ucma_query_path(struct ucma_context *ctx,
911 void __user *response, int out_len)
912{
913 struct rdma_ucm_query_path_resp *resp;
914 int i, ret = 0;
915
916 if (out_len < sizeof(*resp))
917 return -ENOSPC;
918
919 resp = kzalloc(out_len, GFP_KERNEL);
920 if (!resp)
921 return -ENOMEM;
922
923 resp->num_paths = ctx->cm_id->route.num_pri_alt_paths;
924 for (i = 0, out_len -= sizeof(*resp);
925 i < resp->num_paths && out_len > sizeof(struct ib_path_rec_data);
926 i++, out_len -= sizeof(struct ib_path_rec_data)) {
927 struct sa_path_rec *rec = &ctx->cm_id->route.path_rec[i];
928
929 resp->path_data[i].flags = IB_PATH_GMP | IB_PATH_PRIMARY |
930 IB_PATH_BIDIRECTIONAL;
931 if (rec->rec_type == SA_PATH_REC_TYPE_OPA) {
932 struct sa_path_rec ib;
933
934 sa_convert_path_opa_to_ib(&ib, rec);
935 ib_sa_pack_path(&ib, &resp->path_data[i].path_rec);
936
937 } else {
938 ib_sa_pack_path(rec, &resp->path_data[i].path_rec);
939 }
940 }
941
942 if (copy_to_user(response, resp, struct_size(resp, path_data, i)))
943 ret = -EFAULT;
944
945 kfree(resp);
946 return ret;
947}
948
949static ssize_t ucma_query_gid(struct ucma_context *ctx,
950 void __user *response, int out_len)
951{
952 struct rdma_ucm_query_addr_resp resp;
953 struct sockaddr_ib *addr;
954 int ret = 0;
955
956 if (out_len < offsetof(struct rdma_ucm_query_addr_resp, ibdev_index))
957 return -ENOSPC;
958
959 memset(&resp, 0, sizeof resp);
960
961 ucma_query_device_addr(ctx->cm_id, &resp);
962
963 addr = (struct sockaddr_ib *) &resp.src_addr;
964 resp.src_size = sizeof(*addr);
965 if (ctx->cm_id->route.addr.src_addr.ss_family == AF_IB) {
966 memcpy(addr, &ctx->cm_id->route.addr.src_addr, resp.src_size);
967 } else {
968 addr->sib_family = AF_IB;
969 addr->sib_pkey = (__force __be16) resp.pkey;
970 rdma_read_gids(ctx->cm_id, (union ib_gid *)&addr->sib_addr,
971 NULL);
972 addr->sib_sid = rdma_get_service_id(ctx->cm_id, (struct sockaddr *)
973 &ctx->cm_id->route.addr.src_addr);
974 }
975
976 addr = (struct sockaddr_ib *) &resp.dst_addr;
977 resp.dst_size = sizeof(*addr);
978 if (ctx->cm_id->route.addr.dst_addr.ss_family == AF_IB) {
979 memcpy(addr, &ctx->cm_id->route.addr.dst_addr, resp.dst_size);
980 } else {
981 addr->sib_family = AF_IB;
982 addr->sib_pkey = (__force __be16) resp.pkey;
983 rdma_read_gids(ctx->cm_id, NULL,
984 (union ib_gid *)&addr->sib_addr);
985 addr->sib_sid = rdma_get_service_id(ctx->cm_id, (struct sockaddr *)
986 &ctx->cm_id->route.addr.dst_addr);
987 }
988
989 if (copy_to_user(response, &resp, min_t(size_t, out_len, sizeof(resp))))
990 ret = -EFAULT;
991
992 return ret;
993}
994
995static ssize_t ucma_query(struct ucma_file *file,
996 const char __user *inbuf,
997 int in_len, int out_len)
998{
999 struct rdma_ucm_query cmd;
1000 struct ucma_context *ctx;
1001 void __user *response;
1002 int ret;
1003
1004 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1005 return -EFAULT;
1006
1007 response = u64_to_user_ptr(cmd.response);
1008 ctx = ucma_get_ctx(file, cmd.id);
1009 if (IS_ERR(ctx))
1010 return PTR_ERR(ctx);
1011
1012 mutex_lock(&ctx->mutex);
1013 switch (cmd.option) {
1014 case RDMA_USER_CM_QUERY_ADDR:
1015 ret = ucma_query_addr(ctx, response, out_len);
1016 break;
1017 case RDMA_USER_CM_QUERY_PATH:
1018 ret = ucma_query_path(ctx, response, out_len);
1019 break;
1020 case RDMA_USER_CM_QUERY_GID:
1021 ret = ucma_query_gid(ctx, response, out_len);
1022 break;
1023 default:
1024 ret = -ENOSYS;
1025 break;
1026 }
1027 mutex_unlock(&ctx->mutex);
1028
1029 ucma_put_ctx(ctx);
1030 return ret;
1031}
1032
1033static void ucma_copy_conn_param(struct rdma_cm_id *id,
1034 struct rdma_conn_param *dst,
1035 struct rdma_ucm_conn_param *src)
1036{
1037 dst->private_data = src->private_data;
1038 dst->private_data_len = src->private_data_len;
1039 dst->responder_resources = src->responder_resources;
1040 dst->initiator_depth = src->initiator_depth;
1041 dst->flow_control = src->flow_control;
1042 dst->retry_count = src->retry_count;
1043 dst->rnr_retry_count = src->rnr_retry_count;
1044 dst->srq = src->srq;
1045 dst->qp_num = src->qp_num & 0xFFFFFF;
1046 dst->qkey = (id->route.addr.src_addr.ss_family == AF_IB) ? src->qkey : 0;
1047}
1048
1049static ssize_t ucma_connect(struct ucma_file *file, const char __user *inbuf,
1050 int in_len, int out_len)
1051{
1052 struct rdma_conn_param conn_param;
1053 struct rdma_ucm_ece ece = {};
1054 struct rdma_ucm_connect cmd;
1055 struct ucma_context *ctx;
1056 size_t in_size;
1057 int ret;
1058
1059 if (in_len < offsetofend(typeof(cmd), reserved))
1060 return -EINVAL;
1061 in_size = min_t(size_t, in_len, sizeof(cmd));
1062 if (copy_from_user(&cmd, inbuf, in_size))
1063 return -EFAULT;
1064
1065 if (!cmd.conn_param.valid)
1066 return -EINVAL;
1067
1068 ctx = ucma_get_ctx_dev(file, cmd.id);
1069 if (IS_ERR(ctx))
1070 return PTR_ERR(ctx);
1071
1072 ucma_copy_conn_param(ctx->cm_id, &conn_param, &cmd.conn_param);
1073 if (offsetofend(typeof(cmd), ece) <= in_size) {
1074 ece.vendor_id = cmd.ece.vendor_id;
1075 ece.attr_mod = cmd.ece.attr_mod;
1076 }
1077
1078 mutex_lock(&ctx->mutex);
1079 ret = rdma_connect_ece(ctx->cm_id, &conn_param, &ece);
1080 mutex_unlock(&ctx->mutex);
1081 ucma_put_ctx(ctx);
1082 return ret;
1083}
1084
1085static ssize_t ucma_listen(struct ucma_file *file, const char __user *inbuf,
1086 int in_len, int out_len)
1087{
1088 struct rdma_ucm_listen cmd;
1089 struct ucma_context *ctx;
1090 int ret;
1091
1092 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1093 return -EFAULT;
1094
1095 ctx = ucma_get_ctx(file, cmd.id);
1096 if (IS_ERR(ctx))
1097 return PTR_ERR(ctx);
1098
1099 if (cmd.backlog <= 0 || cmd.backlog > max_backlog)
1100 cmd.backlog = max_backlog;
1101 atomic_set(&ctx->backlog, cmd.backlog);
1102
1103 mutex_lock(&ctx->mutex);
1104 ret = rdma_listen(ctx->cm_id, cmd.backlog);
1105 mutex_unlock(&ctx->mutex);
1106 ucma_put_ctx(ctx);
1107 return ret;
1108}
1109
1110static ssize_t ucma_accept(struct ucma_file *file, const char __user *inbuf,
1111 int in_len, int out_len)
1112{
1113 struct rdma_ucm_accept cmd;
1114 struct rdma_conn_param conn_param;
1115 struct rdma_ucm_ece ece = {};
1116 struct ucma_context *ctx;
1117 size_t in_size;
1118 int ret;
1119
1120 if (in_len < offsetofend(typeof(cmd), reserved))
1121 return -EINVAL;
1122 in_size = min_t(size_t, in_len, sizeof(cmd));
1123 if (copy_from_user(&cmd, inbuf, in_size))
1124 return -EFAULT;
1125
1126 ctx = ucma_get_ctx_dev(file, cmd.id);
1127 if (IS_ERR(ctx))
1128 return PTR_ERR(ctx);
1129
1130 if (offsetofend(typeof(cmd), ece) <= in_size) {
1131 ece.vendor_id = cmd.ece.vendor_id;
1132 ece.attr_mod = cmd.ece.attr_mod;
1133 }
1134
1135 if (cmd.conn_param.valid) {
1136 ucma_copy_conn_param(ctx->cm_id, &conn_param, &cmd.conn_param);
1137 mutex_lock(&ctx->mutex);
1138 rdma_lock_handler(ctx->cm_id);
1139 ret = rdma_accept_ece(ctx->cm_id, &conn_param, &ece);
1140 if (!ret) {
1141 /* The uid must be set atomically with the handler */
1142 ctx->uid = cmd.uid;
1143 }
1144 rdma_unlock_handler(ctx->cm_id);
1145 mutex_unlock(&ctx->mutex);
1146 } else {
1147 mutex_lock(&ctx->mutex);
1148 rdma_lock_handler(ctx->cm_id);
1149 ret = rdma_accept_ece(ctx->cm_id, NULL, &ece);
1150 rdma_unlock_handler(ctx->cm_id);
1151 mutex_unlock(&ctx->mutex);
1152 }
1153 ucma_put_ctx(ctx);
1154 return ret;
1155}
1156
1157static ssize_t ucma_reject(struct ucma_file *file, const char __user *inbuf,
1158 int in_len, int out_len)
1159{
1160 struct rdma_ucm_reject cmd;
1161 struct ucma_context *ctx;
1162 int ret;
1163
1164 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1165 return -EFAULT;
1166
1167 if (!cmd.reason)
1168 cmd.reason = IB_CM_REJ_CONSUMER_DEFINED;
1169
1170 switch (cmd.reason) {
1171 case IB_CM_REJ_CONSUMER_DEFINED:
1172 case IB_CM_REJ_VENDOR_OPTION_NOT_SUPPORTED:
1173 break;
1174 default:
1175 return -EINVAL;
1176 }
1177
1178 ctx = ucma_get_ctx_dev(file, cmd.id);
1179 if (IS_ERR(ctx))
1180 return PTR_ERR(ctx);
1181
1182 mutex_lock(&ctx->mutex);
1183 ret = rdma_reject(ctx->cm_id, cmd.private_data, cmd.private_data_len,
1184 cmd.reason);
1185 mutex_unlock(&ctx->mutex);
1186 ucma_put_ctx(ctx);
1187 return ret;
1188}
1189
1190static ssize_t ucma_disconnect(struct ucma_file *file, const char __user *inbuf,
1191 int in_len, int out_len)
1192{
1193 struct rdma_ucm_disconnect cmd;
1194 struct ucma_context *ctx;
1195 int ret;
1196
1197 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1198 return -EFAULT;
1199
1200 ctx = ucma_get_ctx_dev(file, cmd.id);
1201 if (IS_ERR(ctx))
1202 return PTR_ERR(ctx);
1203
1204 mutex_lock(&ctx->mutex);
1205 ret = rdma_disconnect(ctx->cm_id);
1206 mutex_unlock(&ctx->mutex);
1207 ucma_put_ctx(ctx);
1208 return ret;
1209}
1210
1211static ssize_t ucma_init_qp_attr(struct ucma_file *file,
1212 const char __user *inbuf,
1213 int in_len, int out_len)
1214{
1215 struct rdma_ucm_init_qp_attr cmd;
1216 struct ib_uverbs_qp_attr resp;
1217 struct ucma_context *ctx;
1218 struct ib_qp_attr qp_attr;
1219 int ret;
1220
1221 if (out_len < sizeof(resp))
1222 return -ENOSPC;
1223
1224 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1225 return -EFAULT;
1226
1227 if (cmd.qp_state > IB_QPS_ERR)
1228 return -EINVAL;
1229
1230 ctx = ucma_get_ctx_dev(file, cmd.id);
1231 if (IS_ERR(ctx))
1232 return PTR_ERR(ctx);
1233
1234 resp.qp_attr_mask = 0;
1235 memset(&qp_attr, 0, sizeof qp_attr);
1236 qp_attr.qp_state = cmd.qp_state;
1237 mutex_lock(&ctx->mutex);
1238 ret = rdma_init_qp_attr(ctx->cm_id, &qp_attr, &resp.qp_attr_mask);
1239 mutex_unlock(&ctx->mutex);
1240 if (ret)
1241 goto out;
1242
1243 ib_copy_qp_attr_to_user(ctx->cm_id->device, &resp, &qp_attr);
1244 if (copy_to_user(u64_to_user_ptr(cmd.response),
1245 &resp, sizeof(resp)))
1246 ret = -EFAULT;
1247
1248out:
1249 ucma_put_ctx(ctx);
1250 return ret;
1251}
1252
1253static int ucma_set_option_id(struct ucma_context *ctx, int optname,
1254 void *optval, size_t optlen)
1255{
1256 int ret = 0;
1257
1258 switch (optname) {
1259 case RDMA_OPTION_ID_TOS:
1260 if (optlen != sizeof(u8)) {
1261 ret = -EINVAL;
1262 break;
1263 }
1264 rdma_set_service_type(ctx->cm_id, *((u8 *) optval));
1265 break;
1266 case RDMA_OPTION_ID_REUSEADDR:
1267 if (optlen != sizeof(int)) {
1268 ret = -EINVAL;
1269 break;
1270 }
1271 ret = rdma_set_reuseaddr(ctx->cm_id, *((int *) optval) ? 1 : 0);
1272 break;
1273 case RDMA_OPTION_ID_AFONLY:
1274 if (optlen != sizeof(int)) {
1275 ret = -EINVAL;
1276 break;
1277 }
1278 ret = rdma_set_afonly(ctx->cm_id, *((int *) optval) ? 1 : 0);
1279 break;
1280 case RDMA_OPTION_ID_ACK_TIMEOUT:
1281 if (optlen != sizeof(u8)) {
1282 ret = -EINVAL;
1283 break;
1284 }
1285 ret = rdma_set_ack_timeout(ctx->cm_id, *((u8 *)optval));
1286 break;
1287 default:
1288 ret = -ENOSYS;
1289 }
1290
1291 return ret;
1292}
1293
1294static int ucma_set_ib_path(struct ucma_context *ctx,
1295 struct ib_path_rec_data *path_data, size_t optlen)
1296{
1297 struct sa_path_rec sa_path;
1298 struct rdma_cm_event event;
1299 int ret;
1300
1301 if (optlen % sizeof(*path_data))
1302 return -EINVAL;
1303
1304 for (; optlen; optlen -= sizeof(*path_data), path_data++) {
1305 if (path_data->flags == (IB_PATH_GMP | IB_PATH_PRIMARY |
1306 IB_PATH_BIDIRECTIONAL))
1307 break;
1308 }
1309
1310 if (!optlen)
1311 return -EINVAL;
1312
1313 if (!ctx->cm_id->device)
1314 return -EINVAL;
1315
1316 memset(&sa_path, 0, sizeof(sa_path));
1317
1318 sa_path.rec_type = SA_PATH_REC_TYPE_IB;
1319 ib_sa_unpack_path(path_data->path_rec, &sa_path);
1320
1321 if (rdma_cap_opa_ah(ctx->cm_id->device, ctx->cm_id->port_num)) {
1322 struct sa_path_rec opa;
1323
1324 sa_convert_path_ib_to_opa(&opa, &sa_path);
1325 mutex_lock(&ctx->mutex);
1326 ret = rdma_set_ib_path(ctx->cm_id, &opa);
1327 mutex_unlock(&ctx->mutex);
1328 } else {
1329 mutex_lock(&ctx->mutex);
1330 ret = rdma_set_ib_path(ctx->cm_id, &sa_path);
1331 mutex_unlock(&ctx->mutex);
1332 }
1333 if (ret)
1334 return ret;
1335
1336 memset(&event, 0, sizeof event);
1337 event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
1338 return ucma_event_handler(ctx->cm_id, &event);
1339}
1340
1341static int ucma_set_option_ib(struct ucma_context *ctx, int optname,
1342 void *optval, size_t optlen)
1343{
1344 int ret;
1345
1346 switch (optname) {
1347 case RDMA_OPTION_IB_PATH:
1348 ret = ucma_set_ib_path(ctx, optval, optlen);
1349 break;
1350 default:
1351 ret = -ENOSYS;
1352 }
1353
1354 return ret;
1355}
1356
1357static int ucma_set_option_level(struct ucma_context *ctx, int level,
1358 int optname, void *optval, size_t optlen)
1359{
1360 int ret;
1361
1362 switch (level) {
1363 case RDMA_OPTION_ID:
1364 mutex_lock(&ctx->mutex);
1365 ret = ucma_set_option_id(ctx, optname, optval, optlen);
1366 mutex_unlock(&ctx->mutex);
1367 break;
1368 case RDMA_OPTION_IB:
1369 ret = ucma_set_option_ib(ctx, optname, optval, optlen);
1370 break;
1371 default:
1372 ret = -ENOSYS;
1373 }
1374
1375 return ret;
1376}
1377
1378static ssize_t ucma_set_option(struct ucma_file *file, const char __user *inbuf,
1379 int in_len, int out_len)
1380{
1381 struct rdma_ucm_set_option cmd;
1382 struct ucma_context *ctx;
1383 void *optval;
1384 int ret;
1385
1386 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1387 return -EFAULT;
1388
1389 if (unlikely(cmd.optlen > KMALLOC_MAX_SIZE))
1390 return -EINVAL;
1391
1392 ctx = ucma_get_ctx(file, cmd.id);
1393 if (IS_ERR(ctx))
1394 return PTR_ERR(ctx);
1395
1396 optval = memdup_user(u64_to_user_ptr(cmd.optval),
1397 cmd.optlen);
1398 if (IS_ERR(optval)) {
1399 ret = PTR_ERR(optval);
1400 goto out;
1401 }
1402
1403 ret = ucma_set_option_level(ctx, cmd.level, cmd.optname, optval,
1404 cmd.optlen);
1405 kfree(optval);
1406
1407out:
1408 ucma_put_ctx(ctx);
1409 return ret;
1410}
1411
1412static ssize_t ucma_notify(struct ucma_file *file, const char __user *inbuf,
1413 int in_len, int out_len)
1414{
1415 struct rdma_ucm_notify cmd;
1416 struct ucma_context *ctx;
1417 int ret = -EINVAL;
1418
1419 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1420 return -EFAULT;
1421
1422 ctx = ucma_get_ctx(file, cmd.id);
1423 if (IS_ERR(ctx))
1424 return PTR_ERR(ctx);
1425
1426 mutex_lock(&ctx->mutex);
1427 if (ctx->cm_id->device)
1428 ret = rdma_notify(ctx->cm_id, (enum ib_event_type)cmd.event);
1429 mutex_unlock(&ctx->mutex);
1430
1431 ucma_put_ctx(ctx);
1432 return ret;
1433}
1434
1435static ssize_t ucma_process_join(struct ucma_file *file,
1436 struct rdma_ucm_join_mcast *cmd, int out_len)
1437{
1438 struct rdma_ucm_create_id_resp resp;
1439 struct ucma_context *ctx;
1440 struct ucma_multicast *mc;
1441 struct sockaddr *addr;
1442 int ret;
1443 u8 join_state;
1444
1445 if (out_len < sizeof(resp))
1446 return -ENOSPC;
1447
1448 addr = (struct sockaddr *) &cmd->addr;
1449 if (cmd->addr_size != rdma_addr_size(addr))
1450 return -EINVAL;
1451
1452 if (cmd->join_flags == RDMA_MC_JOIN_FLAG_FULLMEMBER)
1453 join_state = BIT(FULLMEMBER_JOIN);
1454 else if (cmd->join_flags == RDMA_MC_JOIN_FLAG_SENDONLY_FULLMEMBER)
1455 join_state = BIT(SENDONLY_FULLMEMBER_JOIN);
1456 else
1457 return -EINVAL;
1458
1459 ctx = ucma_get_ctx_dev(file, cmd->id);
1460 if (IS_ERR(ctx))
1461 return PTR_ERR(ctx);
1462
1463 mc = kzalloc(sizeof(*mc), GFP_KERNEL);
1464 if (!mc) {
1465 ret = -ENOMEM;
1466 goto err_put_ctx;
1467 }
1468
1469 mc->ctx = ctx;
1470 mc->join_state = join_state;
1471 mc->uid = cmd->uid;
1472 memcpy(&mc->addr, addr, cmd->addr_size);
1473
1474 xa_lock(&multicast_table);
1475 if (__xa_alloc(&multicast_table, &mc->id, NULL, xa_limit_32b,
1476 GFP_KERNEL)) {
1477 ret = -ENOMEM;
1478 goto err_free_mc;
1479 }
1480
1481 list_add_tail(&mc->list, &ctx->mc_list);
1482 xa_unlock(&multicast_table);
1483
1484 mutex_lock(&ctx->mutex);
1485 ret = rdma_join_multicast(ctx->cm_id, (struct sockaddr *)&mc->addr,
1486 join_state, mc);
1487 mutex_unlock(&ctx->mutex);
1488 if (ret)
1489 goto err_xa_erase;
1490
1491 resp.id = mc->id;
1492 if (copy_to_user(u64_to_user_ptr(cmd->response),
1493 &resp, sizeof(resp))) {
1494 ret = -EFAULT;
1495 goto err_leave_multicast;
1496 }
1497
1498 xa_store(&multicast_table, mc->id, mc, 0);
1499
1500 ucma_put_ctx(ctx);
1501 return 0;
1502
1503err_leave_multicast:
1504 mutex_lock(&ctx->mutex);
1505 rdma_leave_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr);
1506 mutex_unlock(&ctx->mutex);
1507 ucma_cleanup_mc_events(mc);
1508err_xa_erase:
1509 xa_lock(&multicast_table);
1510 list_del(&mc->list);
1511 __xa_erase(&multicast_table, mc->id);
1512err_free_mc:
1513 xa_unlock(&multicast_table);
1514 kfree(mc);
1515err_put_ctx:
1516 ucma_put_ctx(ctx);
1517 return ret;
1518}
1519
1520static ssize_t ucma_join_ip_multicast(struct ucma_file *file,
1521 const char __user *inbuf,
1522 int in_len, int out_len)
1523{
1524 struct rdma_ucm_join_ip_mcast cmd;
1525 struct rdma_ucm_join_mcast join_cmd;
1526
1527 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1528 return -EFAULT;
1529
1530 join_cmd.response = cmd.response;
1531 join_cmd.uid = cmd.uid;
1532 join_cmd.id = cmd.id;
1533 join_cmd.addr_size = rdma_addr_size_in6(&cmd.addr);
1534 if (!join_cmd.addr_size)
1535 return -EINVAL;
1536
1537 join_cmd.join_flags = RDMA_MC_JOIN_FLAG_FULLMEMBER;
1538 memcpy(&join_cmd.addr, &cmd.addr, join_cmd.addr_size);
1539
1540 return ucma_process_join(file, &join_cmd, out_len);
1541}
1542
1543static ssize_t ucma_join_multicast(struct ucma_file *file,
1544 const char __user *inbuf,
1545 int in_len, int out_len)
1546{
1547 struct rdma_ucm_join_mcast cmd;
1548
1549 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1550 return -EFAULT;
1551
1552 if (!rdma_addr_size_kss(&cmd.addr))
1553 return -EINVAL;
1554
1555 return ucma_process_join(file, &cmd, out_len);
1556}
1557
1558static ssize_t ucma_leave_multicast(struct ucma_file *file,
1559 const char __user *inbuf,
1560 int in_len, int out_len)
1561{
1562 struct rdma_ucm_destroy_id cmd;
1563 struct rdma_ucm_destroy_id_resp resp;
1564 struct ucma_multicast *mc;
1565 int ret = 0;
1566
1567 if (out_len < sizeof(resp))
1568 return -ENOSPC;
1569
1570 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1571 return -EFAULT;
1572
1573 xa_lock(&multicast_table);
1574 mc = xa_load(&multicast_table, cmd.id);
1575 if (!mc)
1576 mc = ERR_PTR(-ENOENT);
1577 else if (READ_ONCE(mc->ctx->file) != file)
1578 mc = ERR_PTR(-EINVAL);
1579 else if (!refcount_inc_not_zero(&mc->ctx->ref))
1580 mc = ERR_PTR(-ENXIO);
1581
1582 if (IS_ERR(mc)) {
1583 xa_unlock(&multicast_table);
1584 ret = PTR_ERR(mc);
1585 goto out;
1586 }
1587
1588 list_del(&mc->list);
1589 __xa_erase(&multicast_table, mc->id);
1590 xa_unlock(&multicast_table);
1591
1592 mutex_lock(&mc->ctx->mutex);
1593 rdma_leave_multicast(mc->ctx->cm_id, (struct sockaddr *) &mc->addr);
1594 mutex_unlock(&mc->ctx->mutex);
1595
1596 ucma_cleanup_mc_events(mc);
1597
1598 ucma_put_ctx(mc->ctx);
1599 resp.events_reported = mc->events_reported;
1600 kfree(mc);
1601
1602 if (copy_to_user(u64_to_user_ptr(cmd.response),
1603 &resp, sizeof(resp)))
1604 ret = -EFAULT;
1605out:
1606 return ret;
1607}
1608
1609static ssize_t ucma_migrate_id(struct ucma_file *new_file,
1610 const char __user *inbuf,
1611 int in_len, int out_len)
1612{
1613 struct rdma_ucm_migrate_id cmd;
1614 struct rdma_ucm_migrate_resp resp;
1615 struct ucma_event *uevent, *tmp;
1616 struct ucma_context *ctx;
1617 LIST_HEAD(event_list);
1618 struct ucma_file *cur_file;
1619 int ret = 0;
1620
1621 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1622 return -EFAULT;
1623
1624 /* Get current fd to protect against it being closed */
1625 CLASS(fd, f)(cmd.fd);
1626 if (fd_empty(f))
1627 return -ENOENT;
1628 if (fd_file(f)->f_op != &ucma_fops)
1629 return -EINVAL;
1630 cur_file = fd_file(f)->private_data;
1631
1632 /* Validate current fd and prevent destruction of id. */
1633 ctx = ucma_get_ctx(cur_file, cmd.id);
1634 if (IS_ERR(ctx))
1635 return PTR_ERR(ctx);
1636
1637 rdma_lock_handler(ctx->cm_id);
1638 /*
1639 * ctx->file can only be changed under the handler & xa_lock. xa_load()
1640 * must be checked again to ensure the ctx hasn't begun destruction
1641 * since the ucma_get_ctx().
1642 */
1643 xa_lock(&ctx_table);
1644 if (_ucma_find_context(cmd.id, cur_file) != ctx) {
1645 xa_unlock(&ctx_table);
1646 ret = -ENOENT;
1647 goto err_unlock;
1648 }
1649 ctx->file = new_file;
1650 xa_unlock(&ctx_table);
1651
1652 mutex_lock(&cur_file->mut);
1653 list_del(&ctx->list);
1654 /*
1655 * At this point lock_handler() prevents addition of new uevents for
1656 * this ctx.
1657 */
1658 list_for_each_entry_safe(uevent, tmp, &cur_file->event_list, list)
1659 if (uevent->ctx == ctx)
1660 list_move_tail(&uevent->list, &event_list);
1661 resp.events_reported = ctx->events_reported;
1662 mutex_unlock(&cur_file->mut);
1663
1664 mutex_lock(&new_file->mut);
1665 list_add_tail(&ctx->list, &new_file->ctx_list);
1666 list_splice_tail(&event_list, &new_file->event_list);
1667 mutex_unlock(&new_file->mut);
1668
1669 if (copy_to_user(u64_to_user_ptr(cmd.response),
1670 &resp, sizeof(resp)))
1671 ret = -EFAULT;
1672
1673err_unlock:
1674 rdma_unlock_handler(ctx->cm_id);
1675 ucma_put_ctx(ctx);
1676 return ret;
1677}
1678
1679static ssize_t (*ucma_cmd_table[])(struct ucma_file *file,
1680 const char __user *inbuf,
1681 int in_len, int out_len) = {
1682 [RDMA_USER_CM_CMD_CREATE_ID] = ucma_create_id,
1683 [RDMA_USER_CM_CMD_DESTROY_ID] = ucma_destroy_id,
1684 [RDMA_USER_CM_CMD_BIND_IP] = ucma_bind_ip,
1685 [RDMA_USER_CM_CMD_RESOLVE_IP] = ucma_resolve_ip,
1686 [RDMA_USER_CM_CMD_RESOLVE_ROUTE] = ucma_resolve_route,
1687 [RDMA_USER_CM_CMD_QUERY_ROUTE] = ucma_query_route,
1688 [RDMA_USER_CM_CMD_CONNECT] = ucma_connect,
1689 [RDMA_USER_CM_CMD_LISTEN] = ucma_listen,
1690 [RDMA_USER_CM_CMD_ACCEPT] = ucma_accept,
1691 [RDMA_USER_CM_CMD_REJECT] = ucma_reject,
1692 [RDMA_USER_CM_CMD_DISCONNECT] = ucma_disconnect,
1693 [RDMA_USER_CM_CMD_INIT_QP_ATTR] = ucma_init_qp_attr,
1694 [RDMA_USER_CM_CMD_GET_EVENT] = ucma_get_event,
1695 [RDMA_USER_CM_CMD_GET_OPTION] = NULL,
1696 [RDMA_USER_CM_CMD_SET_OPTION] = ucma_set_option,
1697 [RDMA_USER_CM_CMD_NOTIFY] = ucma_notify,
1698 [RDMA_USER_CM_CMD_JOIN_IP_MCAST] = ucma_join_ip_multicast,
1699 [RDMA_USER_CM_CMD_LEAVE_MCAST] = ucma_leave_multicast,
1700 [RDMA_USER_CM_CMD_MIGRATE_ID] = ucma_migrate_id,
1701 [RDMA_USER_CM_CMD_QUERY] = ucma_query,
1702 [RDMA_USER_CM_CMD_BIND] = ucma_bind,
1703 [RDMA_USER_CM_CMD_RESOLVE_ADDR] = ucma_resolve_addr,
1704 [RDMA_USER_CM_CMD_JOIN_MCAST] = ucma_join_multicast
1705};
1706
1707static ssize_t ucma_write(struct file *filp, const char __user *buf,
1708 size_t len, loff_t *pos)
1709{
1710 struct ucma_file *file = filp->private_data;
1711 struct rdma_ucm_cmd_hdr hdr;
1712 ssize_t ret;
1713
1714 if (!ib_safe_file_access(filp)) {
1715 pr_err_once("%s: process %d (%s) changed security contexts after opening file descriptor, this is not allowed.\n",
1716 __func__, task_tgid_vnr(current), current->comm);
1717 return -EACCES;
1718 }
1719
1720 if (len < sizeof(hdr))
1721 return -EINVAL;
1722
1723 if (copy_from_user(&hdr, buf, sizeof(hdr)))
1724 return -EFAULT;
1725
1726 if (hdr.cmd >= ARRAY_SIZE(ucma_cmd_table))
1727 return -EINVAL;
1728 hdr.cmd = array_index_nospec(hdr.cmd, ARRAY_SIZE(ucma_cmd_table));
1729
1730 if (hdr.in + sizeof(hdr) > len)
1731 return -EINVAL;
1732
1733 if (!ucma_cmd_table[hdr.cmd])
1734 return -ENOSYS;
1735
1736 ret = ucma_cmd_table[hdr.cmd](file, buf + sizeof(hdr), hdr.in, hdr.out);
1737 if (!ret)
1738 ret = len;
1739
1740 return ret;
1741}
1742
1743static __poll_t ucma_poll(struct file *filp, struct poll_table_struct *wait)
1744{
1745 struct ucma_file *file = filp->private_data;
1746 __poll_t mask = 0;
1747
1748 poll_wait(filp, &file->poll_wait, wait);
1749
1750 if (!list_empty(&file->event_list))
1751 mask = EPOLLIN | EPOLLRDNORM;
1752
1753 return mask;
1754}
1755
1756/*
1757 * ucma_open() does not need the BKL:
1758 *
1759 * - no global state is referred to;
1760 * - there is no ioctl method to race against;
1761 * - no further module initialization is required for open to work
1762 * after the device is registered.
1763 */
1764static int ucma_open(struct inode *inode, struct file *filp)
1765{
1766 struct ucma_file *file;
1767
1768 file = kmalloc(sizeof *file, GFP_KERNEL);
1769 if (!file)
1770 return -ENOMEM;
1771
1772 INIT_LIST_HEAD(&file->event_list);
1773 INIT_LIST_HEAD(&file->ctx_list);
1774 init_waitqueue_head(&file->poll_wait);
1775 mutex_init(&file->mut);
1776
1777 filp->private_data = file;
1778 file->filp = filp;
1779
1780 return stream_open(inode, filp);
1781}
1782
1783static int ucma_close(struct inode *inode, struct file *filp)
1784{
1785 struct ucma_file *file = filp->private_data;
1786
1787 /*
1788 * All paths that touch ctx_list or ctx_list starting from write() are
1789 * prevented by this being a FD release function. The list_add_tail() in
1790 * ucma_connect_event_handler() can run concurrently, however it only
1791 * adds to the list *after* a listening ID. By only reading the first of
1792 * the list, and relying on ucma_destroy_private_ctx() to block
1793 * ucma_connect_event_handler(), no additional locking is needed.
1794 */
1795 while (!list_empty(&file->ctx_list)) {
1796 struct ucma_context *ctx = list_first_entry(
1797 &file->ctx_list, struct ucma_context, list);
1798
1799 WARN_ON(xa_cmpxchg(&ctx_table, ctx->id, ctx, XA_ZERO_ENTRY,
1800 GFP_KERNEL) != ctx);
1801 ucma_destroy_private_ctx(ctx);
1802 }
1803 kfree(file);
1804 return 0;
1805}
1806
1807static const struct file_operations ucma_fops = {
1808 .owner = THIS_MODULE,
1809 .open = ucma_open,
1810 .release = ucma_close,
1811 .write = ucma_write,
1812 .poll = ucma_poll,
1813};
1814
1815static struct miscdevice ucma_misc = {
1816 .minor = MISC_DYNAMIC_MINOR,
1817 .name = "rdma_cm",
1818 .nodename = "infiniband/rdma_cm",
1819 .mode = 0666,
1820 .fops = &ucma_fops,
1821};
1822
1823static int ucma_get_global_nl_info(struct ib_client_nl_info *res)
1824{
1825 res->abi = RDMA_USER_CM_ABI_VERSION;
1826 res->cdev = ucma_misc.this_device;
1827 return 0;
1828}
1829
1830static struct ib_client rdma_cma_client = {
1831 .name = "rdma_cm",
1832 .get_global_nl_info = ucma_get_global_nl_info,
1833};
1834MODULE_ALIAS_RDMA_CLIENT("rdma_cm");
1835
1836static ssize_t abi_version_show(struct device *dev,
1837 struct device_attribute *attr, char *buf)
1838{
1839 return sysfs_emit(buf, "%d\n", RDMA_USER_CM_ABI_VERSION);
1840}
1841static DEVICE_ATTR_RO(abi_version);
1842
1843static int __init ucma_init(void)
1844{
1845 int ret;
1846
1847 ret = misc_register(&ucma_misc);
1848 if (ret)
1849 return ret;
1850
1851 ret = device_create_file(ucma_misc.this_device, &dev_attr_abi_version);
1852 if (ret) {
1853 pr_err("rdma_ucm: couldn't create abi_version attr\n");
1854 goto err1;
1855 }
1856
1857 ucma_ctl_table_hdr = register_net_sysctl(&init_net, "net/rdma_ucm", ucma_ctl_table);
1858 if (!ucma_ctl_table_hdr) {
1859 pr_err("rdma_ucm: couldn't register sysctl paths\n");
1860 ret = -ENOMEM;
1861 goto err2;
1862 }
1863
1864 ret = ib_register_client(&rdma_cma_client);
1865 if (ret)
1866 goto err3;
1867
1868 return 0;
1869err3:
1870 unregister_net_sysctl_table(ucma_ctl_table_hdr);
1871err2:
1872 device_remove_file(ucma_misc.this_device, &dev_attr_abi_version);
1873err1:
1874 misc_deregister(&ucma_misc);
1875 return ret;
1876}
1877
1878static void __exit ucma_cleanup(void)
1879{
1880 ib_unregister_client(&rdma_cma_client);
1881 unregister_net_sysctl_table(ucma_ctl_table_hdr);
1882 device_remove_file(ucma_misc.this_device, &dev_attr_abi_version);
1883 misc_deregister(&ucma_misc);
1884}
1885
1886module_init(ucma_init);
1887module_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#include <linux/nsproxy.h>
46
47#include <rdma/rdma_user_cm.h>
48#include <rdma/ib_marshall.h>
49#include <rdma/rdma_cm.h>
50#include <rdma/rdma_cm_ib.h>
51#include <rdma/ib_addr.h>
52#include <rdma/ib.h>
53
54MODULE_AUTHOR("Sean Hefty");
55MODULE_DESCRIPTION("RDMA Userspace Connection Manager Access");
56MODULE_LICENSE("Dual BSD/GPL");
57
58static unsigned int max_backlog = 1024;
59
60static struct ctl_table_header *ucma_ctl_table_hdr;
61static struct ctl_table ucma_ctl_table[] = {
62 {
63 .procname = "max_backlog",
64 .data = &max_backlog,
65 .maxlen = sizeof max_backlog,
66 .mode = 0644,
67 .proc_handler = proc_dointvec,
68 },
69 { }
70};
71
72struct ucma_file {
73 struct mutex mut;
74 struct file *filp;
75 struct list_head ctx_list;
76 struct list_head event_list;
77 wait_queue_head_t poll_wait;
78 struct workqueue_struct *close_wq;
79};
80
81struct ucma_context {
82 int id;
83 struct completion comp;
84 atomic_t ref;
85 int events_reported;
86 int backlog;
87
88 struct ucma_file *file;
89 struct rdma_cm_id *cm_id;
90 u64 uid;
91
92 struct list_head list;
93 struct list_head mc_list;
94 /* mark that device is in process of destroying the internal HW
95 * resources, protected by the global mut
96 */
97 int closing;
98 /* sync between removal event and id destroy, protected by file mut */
99 int destroying;
100 struct work_struct close_work;
101};
102
103struct ucma_multicast {
104 struct ucma_context *ctx;
105 int id;
106 int events_reported;
107
108 u64 uid;
109 struct list_head list;
110 struct sockaddr_storage addr;
111};
112
113struct ucma_event {
114 struct ucma_context *ctx;
115 struct ucma_multicast *mc;
116 struct list_head list;
117 struct rdma_cm_id *cm_id;
118 struct rdma_ucm_event_resp resp;
119 struct work_struct close_work;
120};
121
122static DEFINE_MUTEX(mut);
123static DEFINE_IDR(ctx_idr);
124static DEFINE_IDR(multicast_idr);
125
126static inline struct ucma_context *_ucma_find_context(int id,
127 struct ucma_file *file)
128{
129 struct ucma_context *ctx;
130
131 ctx = idr_find(&ctx_idr, id);
132 if (!ctx)
133 ctx = ERR_PTR(-ENOENT);
134 else if (ctx->file != file)
135 ctx = ERR_PTR(-EINVAL);
136 return ctx;
137}
138
139static struct ucma_context *ucma_get_ctx(struct ucma_file *file, int id)
140{
141 struct ucma_context *ctx;
142
143 mutex_lock(&mut);
144 ctx = _ucma_find_context(id, file);
145 if (!IS_ERR(ctx)) {
146 if (ctx->closing)
147 ctx = ERR_PTR(-EIO);
148 else
149 atomic_inc(&ctx->ref);
150 }
151 mutex_unlock(&mut);
152 return ctx;
153}
154
155static void ucma_put_ctx(struct ucma_context *ctx)
156{
157 if (atomic_dec_and_test(&ctx->ref))
158 complete(&ctx->comp);
159}
160
161static void ucma_close_event_id(struct work_struct *work)
162{
163 struct ucma_event *uevent_close = container_of(work, struct ucma_event, close_work);
164
165 rdma_destroy_id(uevent_close->cm_id);
166 kfree(uevent_close);
167}
168
169static void ucma_close_id(struct work_struct *work)
170{
171 struct ucma_context *ctx = container_of(work, struct ucma_context, close_work);
172
173 /* once all inflight tasks are finished, we close all underlying
174 * resources. The context is still alive till its explicit destryoing
175 * by its creator.
176 */
177 ucma_put_ctx(ctx);
178 wait_for_completion(&ctx->comp);
179 /* No new events will be generated after destroying the id. */
180 rdma_destroy_id(ctx->cm_id);
181}
182
183static struct ucma_context *ucma_alloc_ctx(struct ucma_file *file)
184{
185 struct ucma_context *ctx;
186
187 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
188 if (!ctx)
189 return NULL;
190
191 INIT_WORK(&ctx->close_work, ucma_close_id);
192 atomic_set(&ctx->ref, 1);
193 init_completion(&ctx->comp);
194 INIT_LIST_HEAD(&ctx->mc_list);
195 ctx->file = file;
196
197 mutex_lock(&mut);
198 ctx->id = idr_alloc(&ctx_idr, ctx, 0, 0, GFP_KERNEL);
199 mutex_unlock(&mut);
200 if (ctx->id < 0)
201 goto error;
202
203 list_add_tail(&ctx->list, &file->ctx_list);
204 return ctx;
205
206error:
207 kfree(ctx);
208 return NULL;
209}
210
211static struct ucma_multicast* ucma_alloc_multicast(struct ucma_context *ctx)
212{
213 struct ucma_multicast *mc;
214
215 mc = kzalloc(sizeof(*mc), GFP_KERNEL);
216 if (!mc)
217 return NULL;
218
219 mutex_lock(&mut);
220 mc->id = idr_alloc(&multicast_idr, mc, 0, 0, GFP_KERNEL);
221 mutex_unlock(&mut);
222 if (mc->id < 0)
223 goto error;
224
225 mc->ctx = ctx;
226 list_add_tail(&mc->list, &ctx->mc_list);
227 return mc;
228
229error:
230 kfree(mc);
231 return NULL;
232}
233
234static void ucma_copy_conn_event(struct rdma_ucm_conn_param *dst,
235 struct rdma_conn_param *src)
236{
237 if (src->private_data_len)
238 memcpy(dst->private_data, src->private_data,
239 src->private_data_len);
240 dst->private_data_len = src->private_data_len;
241 dst->responder_resources =src->responder_resources;
242 dst->initiator_depth = src->initiator_depth;
243 dst->flow_control = src->flow_control;
244 dst->retry_count = src->retry_count;
245 dst->rnr_retry_count = src->rnr_retry_count;
246 dst->srq = src->srq;
247 dst->qp_num = src->qp_num;
248}
249
250static void ucma_copy_ud_event(struct rdma_ucm_ud_param *dst,
251 struct rdma_ud_param *src)
252{
253 if (src->private_data_len)
254 memcpy(dst->private_data, src->private_data,
255 src->private_data_len);
256 dst->private_data_len = src->private_data_len;
257 ib_copy_ah_attr_to_user(&dst->ah_attr, &src->ah_attr);
258 dst->qp_num = src->qp_num;
259 dst->qkey = src->qkey;
260}
261
262static void ucma_set_event_context(struct ucma_context *ctx,
263 struct rdma_cm_event *event,
264 struct ucma_event *uevent)
265{
266 uevent->ctx = ctx;
267 switch (event->event) {
268 case RDMA_CM_EVENT_MULTICAST_JOIN:
269 case RDMA_CM_EVENT_MULTICAST_ERROR:
270 uevent->mc = (struct ucma_multicast *)
271 event->param.ud.private_data;
272 uevent->resp.uid = uevent->mc->uid;
273 uevent->resp.id = uevent->mc->id;
274 break;
275 default:
276 uevent->resp.uid = ctx->uid;
277 uevent->resp.id = ctx->id;
278 break;
279 }
280}
281
282/* Called with file->mut locked for the relevant context. */
283static void ucma_removal_event_handler(struct rdma_cm_id *cm_id)
284{
285 struct ucma_context *ctx = cm_id->context;
286 struct ucma_event *con_req_eve;
287 int event_found = 0;
288
289 if (ctx->destroying)
290 return;
291
292 /* only if context is pointing to cm_id that it owns it and can be
293 * queued to be closed, otherwise that cm_id is an inflight one that
294 * is part of that context event list pending to be detached and
295 * reattached to its new context as part of ucma_get_event,
296 * handled separately below.
297 */
298 if (ctx->cm_id == cm_id) {
299 mutex_lock(&mut);
300 ctx->closing = 1;
301 mutex_unlock(&mut);
302 queue_work(ctx->file->close_wq, &ctx->close_work);
303 return;
304 }
305
306 list_for_each_entry(con_req_eve, &ctx->file->event_list, list) {
307 if (con_req_eve->cm_id == cm_id &&
308 con_req_eve->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST) {
309 list_del(&con_req_eve->list);
310 INIT_WORK(&con_req_eve->close_work, ucma_close_event_id);
311 queue_work(ctx->file->close_wq, &con_req_eve->close_work);
312 event_found = 1;
313 break;
314 }
315 }
316 if (!event_found)
317 pr_err("ucma_removal_event_handler: warning: connect request event wasn't found\n");
318}
319
320static int ucma_event_handler(struct rdma_cm_id *cm_id,
321 struct rdma_cm_event *event)
322{
323 struct ucma_event *uevent;
324 struct ucma_context *ctx = cm_id->context;
325 int ret = 0;
326
327 uevent = kzalloc(sizeof(*uevent), GFP_KERNEL);
328 if (!uevent)
329 return event->event == RDMA_CM_EVENT_CONNECT_REQUEST;
330
331 mutex_lock(&ctx->file->mut);
332 uevent->cm_id = cm_id;
333 ucma_set_event_context(ctx, event, uevent);
334 uevent->resp.event = event->event;
335 uevent->resp.status = event->status;
336 if (cm_id->qp_type == IB_QPT_UD)
337 ucma_copy_ud_event(&uevent->resp.param.ud, &event->param.ud);
338 else
339 ucma_copy_conn_event(&uevent->resp.param.conn,
340 &event->param.conn);
341
342 if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST) {
343 if (!ctx->backlog) {
344 ret = -ENOMEM;
345 kfree(uevent);
346 goto out;
347 }
348 ctx->backlog--;
349 } else if (!ctx->uid || ctx->cm_id != cm_id) {
350 /*
351 * We ignore events for new connections until userspace has set
352 * their context. This can only happen if an error occurs on a
353 * new connection before the user accepts it. This is okay,
354 * since the accept will just fail later. However, we do need
355 * to release the underlying HW resources in case of a device
356 * removal event.
357 */
358 if (event->event == RDMA_CM_EVENT_DEVICE_REMOVAL)
359 ucma_removal_event_handler(cm_id);
360
361 kfree(uevent);
362 goto out;
363 }
364
365 list_add_tail(&uevent->list, &ctx->file->event_list);
366 wake_up_interruptible(&ctx->file->poll_wait);
367 if (event->event == RDMA_CM_EVENT_DEVICE_REMOVAL)
368 ucma_removal_event_handler(cm_id);
369out:
370 mutex_unlock(&ctx->file->mut);
371 return ret;
372}
373
374static ssize_t ucma_get_event(struct ucma_file *file, const char __user *inbuf,
375 int in_len, int out_len)
376{
377 struct ucma_context *ctx;
378 struct rdma_ucm_get_event cmd;
379 struct ucma_event *uevent;
380 int ret = 0;
381
382 if (out_len < sizeof uevent->resp)
383 return -ENOSPC;
384
385 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
386 return -EFAULT;
387
388 mutex_lock(&file->mut);
389 while (list_empty(&file->event_list)) {
390 mutex_unlock(&file->mut);
391
392 if (file->filp->f_flags & O_NONBLOCK)
393 return -EAGAIN;
394
395 if (wait_event_interruptible(file->poll_wait,
396 !list_empty(&file->event_list)))
397 return -ERESTARTSYS;
398
399 mutex_lock(&file->mut);
400 }
401
402 uevent = list_entry(file->event_list.next, struct ucma_event, list);
403
404 if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST) {
405 ctx = ucma_alloc_ctx(file);
406 if (!ctx) {
407 ret = -ENOMEM;
408 goto done;
409 }
410 uevent->ctx->backlog++;
411 ctx->cm_id = uevent->cm_id;
412 ctx->cm_id->context = ctx;
413 uevent->resp.id = ctx->id;
414 }
415
416 if (copy_to_user((void __user *)(unsigned long)cmd.response,
417 &uevent->resp, sizeof uevent->resp)) {
418 ret = -EFAULT;
419 goto done;
420 }
421
422 list_del(&uevent->list);
423 uevent->ctx->events_reported++;
424 if (uevent->mc)
425 uevent->mc->events_reported++;
426 kfree(uevent);
427done:
428 mutex_unlock(&file->mut);
429 return ret;
430}
431
432static int ucma_get_qp_type(struct rdma_ucm_create_id *cmd, enum ib_qp_type *qp_type)
433{
434 switch (cmd->ps) {
435 case RDMA_PS_TCP:
436 *qp_type = IB_QPT_RC;
437 return 0;
438 case RDMA_PS_UDP:
439 case RDMA_PS_IPOIB:
440 *qp_type = IB_QPT_UD;
441 return 0;
442 case RDMA_PS_IB:
443 *qp_type = cmd->qp_type;
444 return 0;
445 default:
446 return -EINVAL;
447 }
448}
449
450static ssize_t ucma_create_id(struct ucma_file *file, const char __user *inbuf,
451 int in_len, int out_len)
452{
453 struct rdma_ucm_create_id cmd;
454 struct rdma_ucm_create_id_resp resp;
455 struct ucma_context *ctx;
456 enum ib_qp_type qp_type;
457 int ret;
458
459 if (out_len < sizeof(resp))
460 return -ENOSPC;
461
462 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
463 return -EFAULT;
464
465 ret = ucma_get_qp_type(&cmd, &qp_type);
466 if (ret)
467 return ret;
468
469 mutex_lock(&file->mut);
470 ctx = ucma_alloc_ctx(file);
471 mutex_unlock(&file->mut);
472 if (!ctx)
473 return -ENOMEM;
474
475 ctx->uid = cmd.uid;
476 ctx->cm_id = rdma_create_id(current->nsproxy->net_ns,
477 ucma_event_handler, ctx, cmd.ps, qp_type);
478 if (IS_ERR(ctx->cm_id)) {
479 ret = PTR_ERR(ctx->cm_id);
480 goto err1;
481 }
482
483 resp.id = ctx->id;
484 if (copy_to_user((void __user *)(unsigned long)cmd.response,
485 &resp, sizeof(resp))) {
486 ret = -EFAULT;
487 goto err2;
488 }
489 return 0;
490
491err2:
492 rdma_destroy_id(ctx->cm_id);
493err1:
494 mutex_lock(&mut);
495 idr_remove(&ctx_idr, ctx->id);
496 mutex_unlock(&mut);
497 kfree(ctx);
498 return ret;
499}
500
501static void ucma_cleanup_multicast(struct ucma_context *ctx)
502{
503 struct ucma_multicast *mc, *tmp;
504
505 mutex_lock(&mut);
506 list_for_each_entry_safe(mc, tmp, &ctx->mc_list, list) {
507 list_del(&mc->list);
508 idr_remove(&multicast_idr, mc->id);
509 kfree(mc);
510 }
511 mutex_unlock(&mut);
512}
513
514static void ucma_cleanup_mc_events(struct ucma_multicast *mc)
515{
516 struct ucma_event *uevent, *tmp;
517
518 list_for_each_entry_safe(uevent, tmp, &mc->ctx->file->event_list, list) {
519 if (uevent->mc != mc)
520 continue;
521
522 list_del(&uevent->list);
523 kfree(uevent);
524 }
525}
526
527/*
528 * ucma_free_ctx is called after the underlying rdma CM-ID is destroyed. At
529 * this point, no new events will be reported from the hardware. However, we
530 * still need to cleanup the UCMA context for this ID. Specifically, there
531 * might be events that have not yet been consumed by the user space software.
532 * These might include pending connect requests which we have not completed
533 * processing. We cannot call rdma_destroy_id while holding the lock of the
534 * context (file->mut), as it might cause a deadlock. We therefore extract all
535 * relevant events from the context pending events list while holding the
536 * mutex. After that we release them as needed.
537 */
538static int ucma_free_ctx(struct ucma_context *ctx)
539{
540 int events_reported;
541 struct ucma_event *uevent, *tmp;
542 LIST_HEAD(list);
543
544
545 ucma_cleanup_multicast(ctx);
546
547 /* Cleanup events not yet reported to the user. */
548 mutex_lock(&ctx->file->mut);
549 list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list) {
550 if (uevent->ctx == ctx)
551 list_move_tail(&uevent->list, &list);
552 }
553 list_del(&ctx->list);
554 mutex_unlock(&ctx->file->mut);
555
556 list_for_each_entry_safe(uevent, tmp, &list, list) {
557 list_del(&uevent->list);
558 if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST)
559 rdma_destroy_id(uevent->cm_id);
560 kfree(uevent);
561 }
562
563 events_reported = ctx->events_reported;
564 kfree(ctx);
565 return events_reported;
566}
567
568static ssize_t ucma_destroy_id(struct ucma_file *file, const char __user *inbuf,
569 int in_len, int out_len)
570{
571 struct rdma_ucm_destroy_id cmd;
572 struct rdma_ucm_destroy_id_resp resp;
573 struct ucma_context *ctx;
574 int ret = 0;
575
576 if (out_len < sizeof(resp))
577 return -ENOSPC;
578
579 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
580 return -EFAULT;
581
582 mutex_lock(&mut);
583 ctx = _ucma_find_context(cmd.id, file);
584 if (!IS_ERR(ctx))
585 idr_remove(&ctx_idr, ctx->id);
586 mutex_unlock(&mut);
587
588 if (IS_ERR(ctx))
589 return PTR_ERR(ctx);
590
591 mutex_lock(&ctx->file->mut);
592 ctx->destroying = 1;
593 mutex_unlock(&ctx->file->mut);
594
595 flush_workqueue(ctx->file->close_wq);
596 /* At this point it's guaranteed that there is no inflight
597 * closing task */
598 mutex_lock(&mut);
599 if (!ctx->closing) {
600 mutex_unlock(&mut);
601 ucma_put_ctx(ctx);
602 wait_for_completion(&ctx->comp);
603 rdma_destroy_id(ctx->cm_id);
604 } else {
605 mutex_unlock(&mut);
606 }
607
608 resp.events_reported = ucma_free_ctx(ctx);
609 if (copy_to_user((void __user *)(unsigned long)cmd.response,
610 &resp, sizeof(resp)))
611 ret = -EFAULT;
612
613 return ret;
614}
615
616static ssize_t ucma_bind_ip(struct ucma_file *file, const char __user *inbuf,
617 int in_len, int out_len)
618{
619 struct rdma_ucm_bind_ip cmd;
620 struct ucma_context *ctx;
621 int ret;
622
623 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
624 return -EFAULT;
625
626 ctx = ucma_get_ctx(file, cmd.id);
627 if (IS_ERR(ctx))
628 return PTR_ERR(ctx);
629
630 ret = rdma_bind_addr(ctx->cm_id, (struct sockaddr *) &cmd.addr);
631 ucma_put_ctx(ctx);
632 return ret;
633}
634
635static ssize_t ucma_bind(struct ucma_file *file, const char __user *inbuf,
636 int in_len, int out_len)
637{
638 struct rdma_ucm_bind cmd;
639 struct sockaddr *addr;
640 struct ucma_context *ctx;
641 int ret;
642
643 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
644 return -EFAULT;
645
646 addr = (struct sockaddr *) &cmd.addr;
647 if (cmd.reserved || !cmd.addr_size || (cmd.addr_size != rdma_addr_size(addr)))
648 return -EINVAL;
649
650 ctx = ucma_get_ctx(file, cmd.id);
651 if (IS_ERR(ctx))
652 return PTR_ERR(ctx);
653
654 ret = rdma_bind_addr(ctx->cm_id, addr);
655 ucma_put_ctx(ctx);
656 return ret;
657}
658
659static ssize_t ucma_resolve_ip(struct ucma_file *file,
660 const char __user *inbuf,
661 int in_len, int out_len)
662{
663 struct rdma_ucm_resolve_ip cmd;
664 struct ucma_context *ctx;
665 int ret;
666
667 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
668 return -EFAULT;
669
670 ctx = ucma_get_ctx(file, cmd.id);
671 if (IS_ERR(ctx))
672 return PTR_ERR(ctx);
673
674 ret = rdma_resolve_addr(ctx->cm_id, (struct sockaddr *) &cmd.src_addr,
675 (struct sockaddr *) &cmd.dst_addr,
676 cmd.timeout_ms);
677 ucma_put_ctx(ctx);
678 return ret;
679}
680
681static ssize_t ucma_resolve_addr(struct ucma_file *file,
682 const char __user *inbuf,
683 int in_len, int out_len)
684{
685 struct rdma_ucm_resolve_addr cmd;
686 struct sockaddr *src, *dst;
687 struct ucma_context *ctx;
688 int ret;
689
690 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
691 return -EFAULT;
692
693 src = (struct sockaddr *) &cmd.src_addr;
694 dst = (struct sockaddr *) &cmd.dst_addr;
695 if (cmd.reserved || (cmd.src_size && (cmd.src_size != rdma_addr_size(src))) ||
696 !cmd.dst_size || (cmd.dst_size != rdma_addr_size(dst)))
697 return -EINVAL;
698
699 ctx = ucma_get_ctx(file, cmd.id);
700 if (IS_ERR(ctx))
701 return PTR_ERR(ctx);
702
703 ret = rdma_resolve_addr(ctx->cm_id, src, dst, cmd.timeout_ms);
704 ucma_put_ctx(ctx);
705 return ret;
706}
707
708static ssize_t ucma_resolve_route(struct ucma_file *file,
709 const char __user *inbuf,
710 int in_len, int out_len)
711{
712 struct rdma_ucm_resolve_route cmd;
713 struct ucma_context *ctx;
714 int ret;
715
716 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
717 return -EFAULT;
718
719 ctx = ucma_get_ctx(file, cmd.id);
720 if (IS_ERR(ctx))
721 return PTR_ERR(ctx);
722
723 ret = rdma_resolve_route(ctx->cm_id, cmd.timeout_ms);
724 ucma_put_ctx(ctx);
725 return ret;
726}
727
728static void ucma_copy_ib_route(struct rdma_ucm_query_route_resp *resp,
729 struct rdma_route *route)
730{
731 struct rdma_dev_addr *dev_addr;
732
733 resp->num_paths = route->num_paths;
734 switch (route->num_paths) {
735 case 0:
736 dev_addr = &route->addr.dev_addr;
737 rdma_addr_get_dgid(dev_addr,
738 (union ib_gid *) &resp->ib_route[0].dgid);
739 rdma_addr_get_sgid(dev_addr,
740 (union ib_gid *) &resp->ib_route[0].sgid);
741 resp->ib_route[0].pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
742 break;
743 case 2:
744 ib_copy_path_rec_to_user(&resp->ib_route[1],
745 &route->path_rec[1]);
746 /* fall through */
747 case 1:
748 ib_copy_path_rec_to_user(&resp->ib_route[0],
749 &route->path_rec[0]);
750 break;
751 default:
752 break;
753 }
754}
755
756static void ucma_copy_iboe_route(struct rdma_ucm_query_route_resp *resp,
757 struct rdma_route *route)
758{
759
760 resp->num_paths = route->num_paths;
761 switch (route->num_paths) {
762 case 0:
763 rdma_ip2gid((struct sockaddr *)&route->addr.dst_addr,
764 (union ib_gid *)&resp->ib_route[0].dgid);
765 rdma_ip2gid((struct sockaddr *)&route->addr.src_addr,
766 (union ib_gid *)&resp->ib_route[0].sgid);
767 resp->ib_route[0].pkey = cpu_to_be16(0xffff);
768 break;
769 case 2:
770 ib_copy_path_rec_to_user(&resp->ib_route[1],
771 &route->path_rec[1]);
772 /* fall through */
773 case 1:
774 ib_copy_path_rec_to_user(&resp->ib_route[0],
775 &route->path_rec[0]);
776 break;
777 default:
778 break;
779 }
780}
781
782static void ucma_copy_iw_route(struct rdma_ucm_query_route_resp *resp,
783 struct rdma_route *route)
784{
785 struct rdma_dev_addr *dev_addr;
786
787 dev_addr = &route->addr.dev_addr;
788 rdma_addr_get_dgid(dev_addr, (union ib_gid *) &resp->ib_route[0].dgid);
789 rdma_addr_get_sgid(dev_addr, (union ib_gid *) &resp->ib_route[0].sgid);
790}
791
792static ssize_t ucma_query_route(struct ucma_file *file,
793 const char __user *inbuf,
794 int in_len, int out_len)
795{
796 struct rdma_ucm_query cmd;
797 struct rdma_ucm_query_route_resp resp;
798 struct ucma_context *ctx;
799 struct sockaddr *addr;
800 int ret = 0;
801
802 if (out_len < sizeof(resp))
803 return -ENOSPC;
804
805 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
806 return -EFAULT;
807
808 ctx = ucma_get_ctx(file, cmd.id);
809 if (IS_ERR(ctx))
810 return PTR_ERR(ctx);
811
812 memset(&resp, 0, sizeof resp);
813 addr = (struct sockaddr *) &ctx->cm_id->route.addr.src_addr;
814 memcpy(&resp.src_addr, addr, addr->sa_family == AF_INET ?
815 sizeof(struct sockaddr_in) :
816 sizeof(struct sockaddr_in6));
817 addr = (struct sockaddr *) &ctx->cm_id->route.addr.dst_addr;
818 memcpy(&resp.dst_addr, addr, addr->sa_family == AF_INET ?
819 sizeof(struct sockaddr_in) :
820 sizeof(struct sockaddr_in6));
821 if (!ctx->cm_id->device)
822 goto out;
823
824 resp.node_guid = (__force __u64) ctx->cm_id->device->node_guid;
825 resp.port_num = ctx->cm_id->port_num;
826
827 if (rdma_cap_ib_sa(ctx->cm_id->device, ctx->cm_id->port_num))
828 ucma_copy_ib_route(&resp, &ctx->cm_id->route);
829 else if (rdma_protocol_roce(ctx->cm_id->device, ctx->cm_id->port_num))
830 ucma_copy_iboe_route(&resp, &ctx->cm_id->route);
831 else if (rdma_protocol_iwarp(ctx->cm_id->device, ctx->cm_id->port_num))
832 ucma_copy_iw_route(&resp, &ctx->cm_id->route);
833
834out:
835 if (copy_to_user((void __user *)(unsigned long)cmd.response,
836 &resp, sizeof(resp)))
837 ret = -EFAULT;
838
839 ucma_put_ctx(ctx);
840 return ret;
841}
842
843static void ucma_query_device_addr(struct rdma_cm_id *cm_id,
844 struct rdma_ucm_query_addr_resp *resp)
845{
846 if (!cm_id->device)
847 return;
848
849 resp->node_guid = (__force __u64) cm_id->device->node_guid;
850 resp->port_num = cm_id->port_num;
851 resp->pkey = (__force __u16) cpu_to_be16(
852 ib_addr_get_pkey(&cm_id->route.addr.dev_addr));
853}
854
855static ssize_t ucma_query_addr(struct ucma_context *ctx,
856 void __user *response, int out_len)
857{
858 struct rdma_ucm_query_addr_resp resp;
859 struct sockaddr *addr;
860 int ret = 0;
861
862 if (out_len < sizeof(resp))
863 return -ENOSPC;
864
865 memset(&resp, 0, sizeof resp);
866
867 addr = (struct sockaddr *) &ctx->cm_id->route.addr.src_addr;
868 resp.src_size = rdma_addr_size(addr);
869 memcpy(&resp.src_addr, addr, resp.src_size);
870
871 addr = (struct sockaddr *) &ctx->cm_id->route.addr.dst_addr;
872 resp.dst_size = rdma_addr_size(addr);
873 memcpy(&resp.dst_addr, addr, resp.dst_size);
874
875 ucma_query_device_addr(ctx->cm_id, &resp);
876
877 if (copy_to_user(response, &resp, sizeof(resp)))
878 ret = -EFAULT;
879
880 return ret;
881}
882
883static ssize_t ucma_query_path(struct ucma_context *ctx,
884 void __user *response, int out_len)
885{
886 struct rdma_ucm_query_path_resp *resp;
887 int i, ret = 0;
888
889 if (out_len < sizeof(*resp))
890 return -ENOSPC;
891
892 resp = kzalloc(out_len, GFP_KERNEL);
893 if (!resp)
894 return -ENOMEM;
895
896 resp->num_paths = ctx->cm_id->route.num_paths;
897 for (i = 0, out_len -= sizeof(*resp);
898 i < resp->num_paths && out_len > sizeof(struct ib_path_rec_data);
899 i++, out_len -= sizeof(struct ib_path_rec_data)) {
900
901 resp->path_data[i].flags = IB_PATH_GMP | IB_PATH_PRIMARY |
902 IB_PATH_BIDIRECTIONAL;
903 ib_sa_pack_path(&ctx->cm_id->route.path_rec[i],
904 &resp->path_data[i].path_rec);
905 }
906
907 if (copy_to_user(response, resp,
908 sizeof(*resp) + (i * sizeof(struct ib_path_rec_data))))
909 ret = -EFAULT;
910
911 kfree(resp);
912 return ret;
913}
914
915static ssize_t ucma_query_gid(struct ucma_context *ctx,
916 void __user *response, int out_len)
917{
918 struct rdma_ucm_query_addr_resp resp;
919 struct sockaddr_ib *addr;
920 int ret = 0;
921
922 if (out_len < sizeof(resp))
923 return -ENOSPC;
924
925 memset(&resp, 0, sizeof resp);
926
927 ucma_query_device_addr(ctx->cm_id, &resp);
928
929 addr = (struct sockaddr_ib *) &resp.src_addr;
930 resp.src_size = sizeof(*addr);
931 if (ctx->cm_id->route.addr.src_addr.ss_family == AF_IB) {
932 memcpy(addr, &ctx->cm_id->route.addr.src_addr, resp.src_size);
933 } else {
934 addr->sib_family = AF_IB;
935 addr->sib_pkey = (__force __be16) resp.pkey;
936 rdma_addr_get_sgid(&ctx->cm_id->route.addr.dev_addr,
937 (union ib_gid *) &addr->sib_addr);
938 addr->sib_sid = rdma_get_service_id(ctx->cm_id, (struct sockaddr *)
939 &ctx->cm_id->route.addr.src_addr);
940 }
941
942 addr = (struct sockaddr_ib *) &resp.dst_addr;
943 resp.dst_size = sizeof(*addr);
944 if (ctx->cm_id->route.addr.dst_addr.ss_family == AF_IB) {
945 memcpy(addr, &ctx->cm_id->route.addr.dst_addr, resp.dst_size);
946 } else {
947 addr->sib_family = AF_IB;
948 addr->sib_pkey = (__force __be16) resp.pkey;
949 rdma_addr_get_dgid(&ctx->cm_id->route.addr.dev_addr,
950 (union ib_gid *) &addr->sib_addr);
951 addr->sib_sid = rdma_get_service_id(ctx->cm_id, (struct sockaddr *)
952 &ctx->cm_id->route.addr.dst_addr);
953 }
954
955 if (copy_to_user(response, &resp, sizeof(resp)))
956 ret = -EFAULT;
957
958 return ret;
959}
960
961static ssize_t ucma_query(struct ucma_file *file,
962 const char __user *inbuf,
963 int in_len, int out_len)
964{
965 struct rdma_ucm_query cmd;
966 struct ucma_context *ctx;
967 void __user *response;
968 int ret;
969
970 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
971 return -EFAULT;
972
973 response = (void __user *)(unsigned long) cmd.response;
974 ctx = ucma_get_ctx(file, cmd.id);
975 if (IS_ERR(ctx))
976 return PTR_ERR(ctx);
977
978 switch (cmd.option) {
979 case RDMA_USER_CM_QUERY_ADDR:
980 ret = ucma_query_addr(ctx, response, out_len);
981 break;
982 case RDMA_USER_CM_QUERY_PATH:
983 ret = ucma_query_path(ctx, response, out_len);
984 break;
985 case RDMA_USER_CM_QUERY_GID:
986 ret = ucma_query_gid(ctx, response, out_len);
987 break;
988 default:
989 ret = -ENOSYS;
990 break;
991 }
992
993 ucma_put_ctx(ctx);
994 return ret;
995}
996
997static void ucma_copy_conn_param(struct rdma_cm_id *id,
998 struct rdma_conn_param *dst,
999 struct rdma_ucm_conn_param *src)
1000{
1001 dst->private_data = src->private_data;
1002 dst->private_data_len = src->private_data_len;
1003 dst->responder_resources =src->responder_resources;
1004 dst->initiator_depth = src->initiator_depth;
1005 dst->flow_control = src->flow_control;
1006 dst->retry_count = src->retry_count;
1007 dst->rnr_retry_count = src->rnr_retry_count;
1008 dst->srq = src->srq;
1009 dst->qp_num = src->qp_num;
1010 dst->qkey = (id->route.addr.src_addr.ss_family == AF_IB) ? src->qkey : 0;
1011}
1012
1013static ssize_t ucma_connect(struct ucma_file *file, const char __user *inbuf,
1014 int in_len, int out_len)
1015{
1016 struct rdma_ucm_connect cmd;
1017 struct rdma_conn_param conn_param;
1018 struct ucma_context *ctx;
1019 int ret;
1020
1021 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1022 return -EFAULT;
1023
1024 if (!cmd.conn_param.valid)
1025 return -EINVAL;
1026
1027 ctx = ucma_get_ctx(file, cmd.id);
1028 if (IS_ERR(ctx))
1029 return PTR_ERR(ctx);
1030
1031 ucma_copy_conn_param(ctx->cm_id, &conn_param, &cmd.conn_param);
1032 ret = rdma_connect(ctx->cm_id, &conn_param);
1033 ucma_put_ctx(ctx);
1034 return ret;
1035}
1036
1037static ssize_t ucma_listen(struct ucma_file *file, const char __user *inbuf,
1038 int in_len, int out_len)
1039{
1040 struct rdma_ucm_listen cmd;
1041 struct ucma_context *ctx;
1042 int ret;
1043
1044 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1045 return -EFAULT;
1046
1047 ctx = ucma_get_ctx(file, cmd.id);
1048 if (IS_ERR(ctx))
1049 return PTR_ERR(ctx);
1050
1051 ctx->backlog = cmd.backlog > 0 && cmd.backlog < max_backlog ?
1052 cmd.backlog : max_backlog;
1053 ret = rdma_listen(ctx->cm_id, ctx->backlog);
1054 ucma_put_ctx(ctx);
1055 return ret;
1056}
1057
1058static ssize_t ucma_accept(struct ucma_file *file, const char __user *inbuf,
1059 int in_len, int out_len)
1060{
1061 struct rdma_ucm_accept cmd;
1062 struct rdma_conn_param conn_param;
1063 struct ucma_context *ctx;
1064 int ret;
1065
1066 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1067 return -EFAULT;
1068
1069 ctx = ucma_get_ctx(file, cmd.id);
1070 if (IS_ERR(ctx))
1071 return PTR_ERR(ctx);
1072
1073 if (cmd.conn_param.valid) {
1074 ucma_copy_conn_param(ctx->cm_id, &conn_param, &cmd.conn_param);
1075 mutex_lock(&file->mut);
1076 ret = rdma_accept(ctx->cm_id, &conn_param);
1077 if (!ret)
1078 ctx->uid = cmd.uid;
1079 mutex_unlock(&file->mut);
1080 } else
1081 ret = rdma_accept(ctx->cm_id, NULL);
1082
1083 ucma_put_ctx(ctx);
1084 return ret;
1085}
1086
1087static ssize_t ucma_reject(struct ucma_file *file, const char __user *inbuf,
1088 int in_len, int out_len)
1089{
1090 struct rdma_ucm_reject cmd;
1091 struct ucma_context *ctx;
1092 int ret;
1093
1094 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1095 return -EFAULT;
1096
1097 ctx = ucma_get_ctx(file, cmd.id);
1098 if (IS_ERR(ctx))
1099 return PTR_ERR(ctx);
1100
1101 ret = rdma_reject(ctx->cm_id, cmd.private_data, cmd.private_data_len);
1102 ucma_put_ctx(ctx);
1103 return ret;
1104}
1105
1106static ssize_t ucma_disconnect(struct ucma_file *file, const char __user *inbuf,
1107 int in_len, int out_len)
1108{
1109 struct rdma_ucm_disconnect cmd;
1110 struct ucma_context *ctx;
1111 int ret;
1112
1113 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1114 return -EFAULT;
1115
1116 ctx = ucma_get_ctx(file, cmd.id);
1117 if (IS_ERR(ctx))
1118 return PTR_ERR(ctx);
1119
1120 ret = rdma_disconnect(ctx->cm_id);
1121 ucma_put_ctx(ctx);
1122 return ret;
1123}
1124
1125static ssize_t ucma_init_qp_attr(struct ucma_file *file,
1126 const char __user *inbuf,
1127 int in_len, int out_len)
1128{
1129 struct rdma_ucm_init_qp_attr cmd;
1130 struct ib_uverbs_qp_attr resp;
1131 struct ucma_context *ctx;
1132 struct ib_qp_attr qp_attr;
1133 int ret;
1134
1135 if (out_len < sizeof(resp))
1136 return -ENOSPC;
1137
1138 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1139 return -EFAULT;
1140
1141 ctx = ucma_get_ctx(file, cmd.id);
1142 if (IS_ERR(ctx))
1143 return PTR_ERR(ctx);
1144
1145 resp.qp_attr_mask = 0;
1146 memset(&qp_attr, 0, sizeof qp_attr);
1147 qp_attr.qp_state = cmd.qp_state;
1148 ret = rdma_init_qp_attr(ctx->cm_id, &qp_attr, &resp.qp_attr_mask);
1149 if (ret)
1150 goto out;
1151
1152 ib_copy_qp_attr_to_user(&resp, &qp_attr);
1153 if (copy_to_user((void __user *)(unsigned long)cmd.response,
1154 &resp, sizeof(resp)))
1155 ret = -EFAULT;
1156
1157out:
1158 ucma_put_ctx(ctx);
1159 return ret;
1160}
1161
1162static int ucma_set_option_id(struct ucma_context *ctx, int optname,
1163 void *optval, size_t optlen)
1164{
1165 int ret = 0;
1166
1167 switch (optname) {
1168 case RDMA_OPTION_ID_TOS:
1169 if (optlen != sizeof(u8)) {
1170 ret = -EINVAL;
1171 break;
1172 }
1173 rdma_set_service_type(ctx->cm_id, *((u8 *) optval));
1174 break;
1175 case RDMA_OPTION_ID_REUSEADDR:
1176 if (optlen != sizeof(int)) {
1177 ret = -EINVAL;
1178 break;
1179 }
1180 ret = rdma_set_reuseaddr(ctx->cm_id, *((int *) optval) ? 1 : 0);
1181 break;
1182 case RDMA_OPTION_ID_AFONLY:
1183 if (optlen != sizeof(int)) {
1184 ret = -EINVAL;
1185 break;
1186 }
1187 ret = rdma_set_afonly(ctx->cm_id, *((int *) optval) ? 1 : 0);
1188 break;
1189 default:
1190 ret = -ENOSYS;
1191 }
1192
1193 return ret;
1194}
1195
1196static int ucma_set_ib_path(struct ucma_context *ctx,
1197 struct ib_path_rec_data *path_data, size_t optlen)
1198{
1199 struct ib_sa_path_rec sa_path;
1200 struct rdma_cm_event event;
1201 int ret;
1202
1203 if (optlen % sizeof(*path_data))
1204 return -EINVAL;
1205
1206 for (; optlen; optlen -= sizeof(*path_data), path_data++) {
1207 if (path_data->flags == (IB_PATH_GMP | IB_PATH_PRIMARY |
1208 IB_PATH_BIDIRECTIONAL))
1209 break;
1210 }
1211
1212 if (!optlen)
1213 return -EINVAL;
1214
1215 memset(&sa_path, 0, sizeof(sa_path));
1216
1217 ib_sa_unpack_path(path_data->path_rec, &sa_path);
1218 ret = rdma_set_ib_paths(ctx->cm_id, &sa_path, 1);
1219 if (ret)
1220 return ret;
1221
1222 memset(&event, 0, sizeof event);
1223 event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
1224 return ucma_event_handler(ctx->cm_id, &event);
1225}
1226
1227static int ucma_set_option_ib(struct ucma_context *ctx, int optname,
1228 void *optval, size_t optlen)
1229{
1230 int ret;
1231
1232 switch (optname) {
1233 case RDMA_OPTION_IB_PATH:
1234 ret = ucma_set_ib_path(ctx, optval, optlen);
1235 break;
1236 default:
1237 ret = -ENOSYS;
1238 }
1239
1240 return ret;
1241}
1242
1243static int ucma_set_option_level(struct ucma_context *ctx, int level,
1244 int optname, void *optval, size_t optlen)
1245{
1246 int ret;
1247
1248 switch (level) {
1249 case RDMA_OPTION_ID:
1250 ret = ucma_set_option_id(ctx, optname, optval, optlen);
1251 break;
1252 case RDMA_OPTION_IB:
1253 ret = ucma_set_option_ib(ctx, optname, optval, optlen);
1254 break;
1255 default:
1256 ret = -ENOSYS;
1257 }
1258
1259 return ret;
1260}
1261
1262static ssize_t ucma_set_option(struct ucma_file *file, const char __user *inbuf,
1263 int in_len, int out_len)
1264{
1265 struct rdma_ucm_set_option cmd;
1266 struct ucma_context *ctx;
1267 void *optval;
1268 int ret;
1269
1270 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1271 return -EFAULT;
1272
1273 ctx = ucma_get_ctx(file, cmd.id);
1274 if (IS_ERR(ctx))
1275 return PTR_ERR(ctx);
1276
1277 optval = memdup_user((void __user *) (unsigned long) cmd.optval,
1278 cmd.optlen);
1279 if (IS_ERR(optval)) {
1280 ret = PTR_ERR(optval);
1281 goto out;
1282 }
1283
1284 ret = ucma_set_option_level(ctx, cmd.level, cmd.optname, optval,
1285 cmd.optlen);
1286 kfree(optval);
1287
1288out:
1289 ucma_put_ctx(ctx);
1290 return ret;
1291}
1292
1293static ssize_t ucma_notify(struct ucma_file *file, const char __user *inbuf,
1294 int in_len, int out_len)
1295{
1296 struct rdma_ucm_notify cmd;
1297 struct ucma_context *ctx;
1298 int ret;
1299
1300 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1301 return -EFAULT;
1302
1303 ctx = ucma_get_ctx(file, cmd.id);
1304 if (IS_ERR(ctx))
1305 return PTR_ERR(ctx);
1306
1307 ret = rdma_notify(ctx->cm_id, (enum ib_event_type) cmd.event);
1308 ucma_put_ctx(ctx);
1309 return ret;
1310}
1311
1312static ssize_t ucma_process_join(struct ucma_file *file,
1313 struct rdma_ucm_join_mcast *cmd, int out_len)
1314{
1315 struct rdma_ucm_create_id_resp resp;
1316 struct ucma_context *ctx;
1317 struct ucma_multicast *mc;
1318 struct sockaddr *addr;
1319 int ret;
1320
1321 if (out_len < sizeof(resp))
1322 return -ENOSPC;
1323
1324 addr = (struct sockaddr *) &cmd->addr;
1325 if (cmd->reserved || !cmd->addr_size || (cmd->addr_size != rdma_addr_size(addr)))
1326 return -EINVAL;
1327
1328 ctx = ucma_get_ctx(file, cmd->id);
1329 if (IS_ERR(ctx))
1330 return PTR_ERR(ctx);
1331
1332 mutex_lock(&file->mut);
1333 mc = ucma_alloc_multicast(ctx);
1334 if (!mc) {
1335 ret = -ENOMEM;
1336 goto err1;
1337 }
1338
1339 mc->uid = cmd->uid;
1340 memcpy(&mc->addr, addr, cmd->addr_size);
1341 ret = rdma_join_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr, mc);
1342 if (ret)
1343 goto err2;
1344
1345 resp.id = mc->id;
1346 if (copy_to_user((void __user *)(unsigned long) cmd->response,
1347 &resp, sizeof(resp))) {
1348 ret = -EFAULT;
1349 goto err3;
1350 }
1351
1352 mutex_unlock(&file->mut);
1353 ucma_put_ctx(ctx);
1354 return 0;
1355
1356err3:
1357 rdma_leave_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr);
1358 ucma_cleanup_mc_events(mc);
1359err2:
1360 mutex_lock(&mut);
1361 idr_remove(&multicast_idr, mc->id);
1362 mutex_unlock(&mut);
1363 list_del(&mc->list);
1364 kfree(mc);
1365err1:
1366 mutex_unlock(&file->mut);
1367 ucma_put_ctx(ctx);
1368 return ret;
1369}
1370
1371static ssize_t ucma_join_ip_multicast(struct ucma_file *file,
1372 const char __user *inbuf,
1373 int in_len, int out_len)
1374{
1375 struct rdma_ucm_join_ip_mcast cmd;
1376 struct rdma_ucm_join_mcast join_cmd;
1377
1378 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1379 return -EFAULT;
1380
1381 join_cmd.response = cmd.response;
1382 join_cmd.uid = cmd.uid;
1383 join_cmd.id = cmd.id;
1384 join_cmd.addr_size = rdma_addr_size((struct sockaddr *) &cmd.addr);
1385 join_cmd.reserved = 0;
1386 memcpy(&join_cmd.addr, &cmd.addr, join_cmd.addr_size);
1387
1388 return ucma_process_join(file, &join_cmd, out_len);
1389}
1390
1391static ssize_t ucma_join_multicast(struct ucma_file *file,
1392 const char __user *inbuf,
1393 int in_len, int out_len)
1394{
1395 struct rdma_ucm_join_mcast cmd;
1396
1397 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1398 return -EFAULT;
1399
1400 return ucma_process_join(file, &cmd, out_len);
1401}
1402
1403static ssize_t ucma_leave_multicast(struct ucma_file *file,
1404 const char __user *inbuf,
1405 int in_len, int out_len)
1406{
1407 struct rdma_ucm_destroy_id cmd;
1408 struct rdma_ucm_destroy_id_resp resp;
1409 struct ucma_multicast *mc;
1410 int ret = 0;
1411
1412 if (out_len < sizeof(resp))
1413 return -ENOSPC;
1414
1415 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1416 return -EFAULT;
1417
1418 mutex_lock(&mut);
1419 mc = idr_find(&multicast_idr, cmd.id);
1420 if (!mc)
1421 mc = ERR_PTR(-ENOENT);
1422 else if (mc->ctx->file != file)
1423 mc = ERR_PTR(-EINVAL);
1424 else if (!atomic_inc_not_zero(&mc->ctx->ref))
1425 mc = ERR_PTR(-ENXIO);
1426 else
1427 idr_remove(&multicast_idr, mc->id);
1428 mutex_unlock(&mut);
1429
1430 if (IS_ERR(mc)) {
1431 ret = PTR_ERR(mc);
1432 goto out;
1433 }
1434
1435 rdma_leave_multicast(mc->ctx->cm_id, (struct sockaddr *) &mc->addr);
1436 mutex_lock(&mc->ctx->file->mut);
1437 ucma_cleanup_mc_events(mc);
1438 list_del(&mc->list);
1439 mutex_unlock(&mc->ctx->file->mut);
1440
1441 ucma_put_ctx(mc->ctx);
1442 resp.events_reported = mc->events_reported;
1443 kfree(mc);
1444
1445 if (copy_to_user((void __user *)(unsigned long)cmd.response,
1446 &resp, sizeof(resp)))
1447 ret = -EFAULT;
1448out:
1449 return ret;
1450}
1451
1452static void ucma_lock_files(struct ucma_file *file1, struct ucma_file *file2)
1453{
1454 /* Acquire mutex's based on pointer comparison to prevent deadlock. */
1455 if (file1 < file2) {
1456 mutex_lock(&file1->mut);
1457 mutex_lock_nested(&file2->mut, SINGLE_DEPTH_NESTING);
1458 } else {
1459 mutex_lock(&file2->mut);
1460 mutex_lock_nested(&file1->mut, SINGLE_DEPTH_NESTING);
1461 }
1462}
1463
1464static void ucma_unlock_files(struct ucma_file *file1, struct ucma_file *file2)
1465{
1466 if (file1 < file2) {
1467 mutex_unlock(&file2->mut);
1468 mutex_unlock(&file1->mut);
1469 } else {
1470 mutex_unlock(&file1->mut);
1471 mutex_unlock(&file2->mut);
1472 }
1473}
1474
1475static void ucma_move_events(struct ucma_context *ctx, struct ucma_file *file)
1476{
1477 struct ucma_event *uevent, *tmp;
1478
1479 list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list)
1480 if (uevent->ctx == ctx)
1481 list_move_tail(&uevent->list, &file->event_list);
1482}
1483
1484static ssize_t ucma_migrate_id(struct ucma_file *new_file,
1485 const char __user *inbuf,
1486 int in_len, int out_len)
1487{
1488 struct rdma_ucm_migrate_id cmd;
1489 struct rdma_ucm_migrate_resp resp;
1490 struct ucma_context *ctx;
1491 struct fd f;
1492 struct ucma_file *cur_file;
1493 int ret = 0;
1494
1495 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1496 return -EFAULT;
1497
1498 /* Get current fd to protect against it being closed */
1499 f = fdget(cmd.fd);
1500 if (!f.file)
1501 return -ENOENT;
1502
1503 /* Validate current fd and prevent destruction of id. */
1504 ctx = ucma_get_ctx(f.file->private_data, cmd.id);
1505 if (IS_ERR(ctx)) {
1506 ret = PTR_ERR(ctx);
1507 goto file_put;
1508 }
1509
1510 cur_file = ctx->file;
1511 if (cur_file == new_file) {
1512 resp.events_reported = ctx->events_reported;
1513 goto response;
1514 }
1515
1516 /*
1517 * Migrate events between fd's, maintaining order, and avoiding new
1518 * events being added before existing events.
1519 */
1520 ucma_lock_files(cur_file, new_file);
1521 mutex_lock(&mut);
1522
1523 list_move_tail(&ctx->list, &new_file->ctx_list);
1524 ucma_move_events(ctx, new_file);
1525 ctx->file = new_file;
1526 resp.events_reported = ctx->events_reported;
1527
1528 mutex_unlock(&mut);
1529 ucma_unlock_files(cur_file, new_file);
1530
1531response:
1532 if (copy_to_user((void __user *)(unsigned long)cmd.response,
1533 &resp, sizeof(resp)))
1534 ret = -EFAULT;
1535
1536 ucma_put_ctx(ctx);
1537file_put:
1538 fdput(f);
1539 return ret;
1540}
1541
1542static ssize_t (*ucma_cmd_table[])(struct ucma_file *file,
1543 const char __user *inbuf,
1544 int in_len, int out_len) = {
1545 [RDMA_USER_CM_CMD_CREATE_ID] = ucma_create_id,
1546 [RDMA_USER_CM_CMD_DESTROY_ID] = ucma_destroy_id,
1547 [RDMA_USER_CM_CMD_BIND_IP] = ucma_bind_ip,
1548 [RDMA_USER_CM_CMD_RESOLVE_IP] = ucma_resolve_ip,
1549 [RDMA_USER_CM_CMD_RESOLVE_ROUTE] = ucma_resolve_route,
1550 [RDMA_USER_CM_CMD_QUERY_ROUTE] = ucma_query_route,
1551 [RDMA_USER_CM_CMD_CONNECT] = ucma_connect,
1552 [RDMA_USER_CM_CMD_LISTEN] = ucma_listen,
1553 [RDMA_USER_CM_CMD_ACCEPT] = ucma_accept,
1554 [RDMA_USER_CM_CMD_REJECT] = ucma_reject,
1555 [RDMA_USER_CM_CMD_DISCONNECT] = ucma_disconnect,
1556 [RDMA_USER_CM_CMD_INIT_QP_ATTR] = ucma_init_qp_attr,
1557 [RDMA_USER_CM_CMD_GET_EVENT] = ucma_get_event,
1558 [RDMA_USER_CM_CMD_GET_OPTION] = NULL,
1559 [RDMA_USER_CM_CMD_SET_OPTION] = ucma_set_option,
1560 [RDMA_USER_CM_CMD_NOTIFY] = ucma_notify,
1561 [RDMA_USER_CM_CMD_JOIN_IP_MCAST] = ucma_join_ip_multicast,
1562 [RDMA_USER_CM_CMD_LEAVE_MCAST] = ucma_leave_multicast,
1563 [RDMA_USER_CM_CMD_MIGRATE_ID] = ucma_migrate_id,
1564 [RDMA_USER_CM_CMD_QUERY] = ucma_query,
1565 [RDMA_USER_CM_CMD_BIND] = ucma_bind,
1566 [RDMA_USER_CM_CMD_RESOLVE_ADDR] = ucma_resolve_addr,
1567 [RDMA_USER_CM_CMD_JOIN_MCAST] = ucma_join_multicast
1568};
1569
1570static ssize_t ucma_write(struct file *filp, const char __user *buf,
1571 size_t len, loff_t *pos)
1572{
1573 struct ucma_file *file = filp->private_data;
1574 struct rdma_ucm_cmd_hdr hdr;
1575 ssize_t ret;
1576
1577 if (WARN_ON_ONCE(!ib_safe_file_access(filp)))
1578 return -EACCES;
1579
1580 if (len < sizeof(hdr))
1581 return -EINVAL;
1582
1583 if (copy_from_user(&hdr, buf, sizeof(hdr)))
1584 return -EFAULT;
1585
1586 if (hdr.cmd >= ARRAY_SIZE(ucma_cmd_table))
1587 return -EINVAL;
1588
1589 if (hdr.in + sizeof(hdr) > len)
1590 return -EINVAL;
1591
1592 if (!ucma_cmd_table[hdr.cmd])
1593 return -ENOSYS;
1594
1595 ret = ucma_cmd_table[hdr.cmd](file, buf + sizeof(hdr), hdr.in, hdr.out);
1596 if (!ret)
1597 ret = len;
1598
1599 return ret;
1600}
1601
1602static unsigned int ucma_poll(struct file *filp, struct poll_table_struct *wait)
1603{
1604 struct ucma_file *file = filp->private_data;
1605 unsigned int mask = 0;
1606
1607 poll_wait(filp, &file->poll_wait, wait);
1608
1609 if (!list_empty(&file->event_list))
1610 mask = POLLIN | POLLRDNORM;
1611
1612 return mask;
1613}
1614
1615/*
1616 * ucma_open() does not need the BKL:
1617 *
1618 * - no global state is referred to;
1619 * - there is no ioctl method to race against;
1620 * - no further module initialization is required for open to work
1621 * after the device is registered.
1622 */
1623static int ucma_open(struct inode *inode, struct file *filp)
1624{
1625 struct ucma_file *file;
1626
1627 file = kmalloc(sizeof *file, GFP_KERNEL);
1628 if (!file)
1629 return -ENOMEM;
1630
1631 file->close_wq = create_singlethread_workqueue("ucma_close_id");
1632 if (!file->close_wq) {
1633 kfree(file);
1634 return -ENOMEM;
1635 }
1636
1637 INIT_LIST_HEAD(&file->event_list);
1638 INIT_LIST_HEAD(&file->ctx_list);
1639 init_waitqueue_head(&file->poll_wait);
1640 mutex_init(&file->mut);
1641
1642 filp->private_data = file;
1643 file->filp = filp;
1644
1645 return nonseekable_open(inode, filp);
1646}
1647
1648static int ucma_close(struct inode *inode, struct file *filp)
1649{
1650 struct ucma_file *file = filp->private_data;
1651 struct ucma_context *ctx, *tmp;
1652
1653 mutex_lock(&file->mut);
1654 list_for_each_entry_safe(ctx, tmp, &file->ctx_list, list) {
1655 ctx->destroying = 1;
1656 mutex_unlock(&file->mut);
1657
1658 mutex_lock(&mut);
1659 idr_remove(&ctx_idr, ctx->id);
1660 mutex_unlock(&mut);
1661
1662 flush_workqueue(file->close_wq);
1663 /* At that step once ctx was marked as destroying and workqueue
1664 * was flushed we are safe from any inflights handlers that
1665 * might put other closing task.
1666 */
1667 mutex_lock(&mut);
1668 if (!ctx->closing) {
1669 mutex_unlock(&mut);
1670 /* rdma_destroy_id ensures that no event handlers are
1671 * inflight for that id before releasing it.
1672 */
1673 rdma_destroy_id(ctx->cm_id);
1674 } else {
1675 mutex_unlock(&mut);
1676 }
1677
1678 ucma_free_ctx(ctx);
1679 mutex_lock(&file->mut);
1680 }
1681 mutex_unlock(&file->mut);
1682 destroy_workqueue(file->close_wq);
1683 kfree(file);
1684 return 0;
1685}
1686
1687static const struct file_operations ucma_fops = {
1688 .owner = THIS_MODULE,
1689 .open = ucma_open,
1690 .release = ucma_close,
1691 .write = ucma_write,
1692 .poll = ucma_poll,
1693 .llseek = no_llseek,
1694};
1695
1696static struct miscdevice ucma_misc = {
1697 .minor = MISC_DYNAMIC_MINOR,
1698 .name = "rdma_cm",
1699 .nodename = "infiniband/rdma_cm",
1700 .mode = 0666,
1701 .fops = &ucma_fops,
1702};
1703
1704static ssize_t show_abi_version(struct device *dev,
1705 struct device_attribute *attr,
1706 char *buf)
1707{
1708 return sprintf(buf, "%d\n", RDMA_USER_CM_ABI_VERSION);
1709}
1710static DEVICE_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
1711
1712static int __init ucma_init(void)
1713{
1714 int ret;
1715
1716 ret = misc_register(&ucma_misc);
1717 if (ret)
1718 return ret;
1719
1720 ret = device_create_file(ucma_misc.this_device, &dev_attr_abi_version);
1721 if (ret) {
1722 pr_err("rdma_ucm: couldn't create abi_version attr\n");
1723 goto err1;
1724 }
1725
1726 ucma_ctl_table_hdr = register_net_sysctl(&init_net, "net/rdma_ucm", ucma_ctl_table);
1727 if (!ucma_ctl_table_hdr) {
1728 pr_err("rdma_ucm: couldn't register sysctl paths\n");
1729 ret = -ENOMEM;
1730 goto err2;
1731 }
1732 return 0;
1733err2:
1734 device_remove_file(ucma_misc.this_device, &dev_attr_abi_version);
1735err1:
1736 misc_deregister(&ucma_misc);
1737 return ret;
1738}
1739
1740static void __exit ucma_cleanup(void)
1741{
1742 unregister_net_sysctl_table(ucma_ctl_table_hdr);
1743 device_remove_file(ucma_misc.this_device, &dev_attr_abi_version);
1744 misc_deregister(&ucma_misc);
1745 idr_destroy(&ctx_idr);
1746 idr_destroy(&multicast_idr);
1747}
1748
1749module_init(ucma_init);
1750module_exit(ucma_cleanup);