2 * Copyright (c) 2005-2006 Intel Corporation. All rights reserved.
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:
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
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.
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
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>
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>
46 #include <rdma/rdma_user_cm.h>
47 #include <rdma/ib_marshall.h>
48 #include <rdma/rdma_cm.h>
49 #include <rdma/rdma_cm_ib.h>
51 MODULE_AUTHOR("Sean Hefty");
52 MODULE_DESCRIPTION("RDMA Userspace Connection Manager Access");
53 MODULE_LICENSE("Dual BSD/GPL");
55 static unsigned int max_backlog
= 1024;
57 static struct ctl_table_header
*ucma_ctl_table_hdr
;
58 static ctl_table ucma_ctl_table
[] = {
60 .procname
= "max_backlog",
62 .maxlen
= sizeof max_backlog
,
64 .proc_handler
= proc_dointvec
,
72 struct list_head ctx_list
;
73 struct list_head event_list
;
74 wait_queue_head_t poll_wait
;
79 struct completion comp
;
84 struct ucma_file
*file
;
85 struct rdma_cm_id
*cm_id
;
88 struct list_head list
;
89 struct list_head mc_list
;
92 struct ucma_multicast
{
93 struct ucma_context
*ctx
;
98 struct list_head list
;
99 struct sockaddr_storage addr
;
103 struct ucma_context
*ctx
;
104 struct ucma_multicast
*mc
;
105 struct list_head list
;
106 struct rdma_cm_id
*cm_id
;
107 struct rdma_ucm_event_resp resp
;
110 static DEFINE_MUTEX(mut
);
111 static DEFINE_IDR(ctx_idr
);
112 static DEFINE_IDR(multicast_idr
);
114 static inline struct ucma_context
*_ucma_find_context(int id
,
115 struct ucma_file
*file
)
117 struct ucma_context
*ctx
;
119 ctx
= idr_find(&ctx_idr
, id
);
121 ctx
= ERR_PTR(-ENOENT
);
122 else if (ctx
->file
!= file
)
123 ctx
= ERR_PTR(-EINVAL
);
127 static struct ucma_context
*ucma_get_ctx(struct ucma_file
*file
, int id
)
129 struct ucma_context
*ctx
;
132 ctx
= _ucma_find_context(id
, file
);
134 atomic_inc(&ctx
->ref
);
139 static void ucma_put_ctx(struct ucma_context
*ctx
)
141 if (atomic_dec_and_test(&ctx
->ref
))
142 complete(&ctx
->comp
);
145 static struct ucma_context
*ucma_alloc_ctx(struct ucma_file
*file
)
147 struct ucma_context
*ctx
;
150 ctx
= kzalloc(sizeof(*ctx
), GFP_KERNEL
);
154 atomic_set(&ctx
->ref
, 1);
155 init_completion(&ctx
->comp
);
156 INIT_LIST_HEAD(&ctx
->mc_list
);
160 ret
= idr_pre_get(&ctx_idr
, GFP_KERNEL
);
165 ret
= idr_get_new(&ctx_idr
, ctx
, &ctx
->id
);
167 } while (ret
== -EAGAIN
);
172 list_add_tail(&ctx
->list
, &file
->ctx_list
);
180 static struct ucma_multicast
* ucma_alloc_multicast(struct ucma_context
*ctx
)
182 struct ucma_multicast
*mc
;
185 mc
= kzalloc(sizeof(*mc
), GFP_KERNEL
);
190 ret
= idr_pre_get(&multicast_idr
, GFP_KERNEL
);
195 ret
= idr_get_new(&multicast_idr
, mc
, &mc
->id
);
197 } while (ret
== -EAGAIN
);
203 list_add_tail(&mc
->list
, &ctx
->mc_list
);
211 static void ucma_copy_conn_event(struct rdma_ucm_conn_param
*dst
,
212 struct rdma_conn_param
*src
)
214 if (src
->private_data_len
)
215 memcpy(dst
->private_data
, src
->private_data
,
216 src
->private_data_len
);
217 dst
->private_data_len
= src
->private_data_len
;
218 dst
->responder_resources
=src
->responder_resources
;
219 dst
->initiator_depth
= src
->initiator_depth
;
220 dst
->flow_control
= src
->flow_control
;
221 dst
->retry_count
= src
->retry_count
;
222 dst
->rnr_retry_count
= src
->rnr_retry_count
;
224 dst
->qp_num
= src
->qp_num
;
227 static void ucma_copy_ud_event(struct rdma_ucm_ud_param
*dst
,
228 struct rdma_ud_param
*src
)
230 if (src
->private_data_len
)
231 memcpy(dst
->private_data
, src
->private_data
,
232 src
->private_data_len
);
233 dst
->private_data_len
= src
->private_data_len
;
234 ib_copy_ah_attr_to_user(&dst
->ah_attr
, &src
->ah_attr
);
235 dst
->qp_num
= src
->qp_num
;
236 dst
->qkey
= src
->qkey
;
239 static void ucma_set_event_context(struct ucma_context
*ctx
,
240 struct rdma_cm_event
*event
,
241 struct ucma_event
*uevent
)
244 switch (event
->event
) {
245 case RDMA_CM_EVENT_MULTICAST_JOIN
:
246 case RDMA_CM_EVENT_MULTICAST_ERROR
:
247 uevent
->mc
= (struct ucma_multicast
*)
248 event
->param
.ud
.private_data
;
249 uevent
->resp
.uid
= uevent
->mc
->uid
;
250 uevent
->resp
.id
= uevent
->mc
->id
;
253 uevent
->resp
.uid
= ctx
->uid
;
254 uevent
->resp
.id
= ctx
->id
;
259 static int ucma_event_handler(struct rdma_cm_id
*cm_id
,
260 struct rdma_cm_event
*event
)
262 struct ucma_event
*uevent
;
263 struct ucma_context
*ctx
= cm_id
->context
;
266 uevent
= kzalloc(sizeof(*uevent
), GFP_KERNEL
);
268 return event
->event
== RDMA_CM_EVENT_CONNECT_REQUEST
;
270 uevent
->cm_id
= cm_id
;
271 ucma_set_event_context(ctx
, event
, uevent
);
272 uevent
->resp
.event
= event
->event
;
273 uevent
->resp
.status
= event
->status
;
274 if (cm_id
->qp_type
== IB_QPT_UD
)
275 ucma_copy_ud_event(&uevent
->resp
.param
.ud
, &event
->param
.ud
);
277 ucma_copy_conn_event(&uevent
->resp
.param
.conn
,
280 mutex_lock(&ctx
->file
->mut
);
281 if (event
->event
== RDMA_CM_EVENT_CONNECT_REQUEST
) {
288 } else if (!ctx
->uid
) {
290 * We ignore events for new connections until userspace has set
291 * their context. This can only happen if an error occurs on a
292 * new connection before the user accepts it. This is okay,
293 * since the accept will just fail later.
299 list_add_tail(&uevent
->list
, &ctx
->file
->event_list
);
300 wake_up_interruptible(&ctx
->file
->poll_wait
);
302 mutex_unlock(&ctx
->file
->mut
);
306 static ssize_t
ucma_get_event(struct ucma_file
*file
, const char __user
*inbuf
,
307 int in_len
, int out_len
)
309 struct ucma_context
*ctx
;
310 struct rdma_ucm_get_event cmd
;
311 struct ucma_event
*uevent
;
315 if (out_len
< sizeof uevent
->resp
)
318 if (copy_from_user(&cmd
, inbuf
, sizeof(cmd
)))
321 mutex_lock(&file
->mut
);
322 while (list_empty(&file
->event_list
)) {
323 mutex_unlock(&file
->mut
);
325 if (file
->filp
->f_flags
& O_NONBLOCK
)
328 if (wait_event_interruptible(file
->poll_wait
,
329 !list_empty(&file
->event_list
)))
332 mutex_lock(&file
->mut
);
335 uevent
= list_entry(file
->event_list
.next
, struct ucma_event
, list
);
337 if (uevent
->resp
.event
== RDMA_CM_EVENT_CONNECT_REQUEST
) {
338 ctx
= ucma_alloc_ctx(file
);
343 uevent
->ctx
->backlog
++;
344 ctx
->cm_id
= uevent
->cm_id
;
345 ctx
->cm_id
->context
= ctx
;
346 uevent
->resp
.id
= ctx
->id
;
349 if (copy_to_user((void __user
*)(unsigned long)cmd
.response
,
350 &uevent
->resp
, sizeof uevent
->resp
)) {
355 list_del(&uevent
->list
);
356 uevent
->ctx
->events_reported
++;
358 uevent
->mc
->events_reported
++;
361 mutex_unlock(&file
->mut
);
365 static int ucma_get_qp_type(struct rdma_ucm_create_id
*cmd
, enum ib_qp_type
*qp_type
)
369 *qp_type
= IB_QPT_RC
;
373 *qp_type
= IB_QPT_UD
;
376 *qp_type
= cmd
->qp_type
;
383 static ssize_t
ucma_create_id(struct ucma_file
*file
, const char __user
*inbuf
,
384 int in_len
, int out_len
)
386 struct rdma_ucm_create_id cmd
;
387 struct rdma_ucm_create_id_resp resp
;
388 struct ucma_context
*ctx
;
389 enum ib_qp_type qp_type
;
392 if (out_len
< sizeof(resp
))
395 if (copy_from_user(&cmd
, inbuf
, sizeof(cmd
)))
398 ret
= ucma_get_qp_type(&cmd
, &qp_type
);
402 mutex_lock(&file
->mut
);
403 ctx
= ucma_alloc_ctx(file
);
404 mutex_unlock(&file
->mut
);
409 ctx
->cm_id
= rdma_create_id(ucma_event_handler
, ctx
, cmd
.ps
, qp_type
);
410 if (IS_ERR(ctx
->cm_id
)) {
411 ret
= PTR_ERR(ctx
->cm_id
);
416 if (copy_to_user((void __user
*)(unsigned long)cmd
.response
,
417 &resp
, sizeof(resp
))) {
424 rdma_destroy_id(ctx
->cm_id
);
427 idr_remove(&ctx_idr
, ctx
->id
);
433 static void ucma_cleanup_multicast(struct ucma_context
*ctx
)
435 struct ucma_multicast
*mc
, *tmp
;
438 list_for_each_entry_safe(mc
, tmp
, &ctx
->mc_list
, list
) {
440 idr_remove(&multicast_idr
, mc
->id
);
446 static void ucma_cleanup_mc_events(struct ucma_multicast
*mc
)
448 struct ucma_event
*uevent
, *tmp
;
450 list_for_each_entry_safe(uevent
, tmp
, &mc
->ctx
->file
->event_list
, list
) {
451 if (uevent
->mc
!= mc
)
454 list_del(&uevent
->list
);
460 * We cannot hold file->mut when calling rdma_destroy_id() or we can
461 * deadlock. We also acquire file->mut in ucma_event_handler(), and
462 * rdma_destroy_id() will wait until all callbacks have completed.
464 static int ucma_free_ctx(struct ucma_context
*ctx
)
467 struct ucma_event
*uevent
, *tmp
;
470 /* No new events will be generated after destroying the id. */
471 rdma_destroy_id(ctx
->cm_id
);
473 ucma_cleanup_multicast(ctx
);
475 /* Cleanup events not yet reported to the user. */
476 mutex_lock(&ctx
->file
->mut
);
477 list_for_each_entry_safe(uevent
, tmp
, &ctx
->file
->event_list
, list
) {
478 if (uevent
->ctx
== ctx
)
479 list_move_tail(&uevent
->list
, &list
);
481 list_del(&ctx
->list
);
482 mutex_unlock(&ctx
->file
->mut
);
484 list_for_each_entry_safe(uevent
, tmp
, &list
, list
) {
485 list_del(&uevent
->list
);
486 if (uevent
->resp
.event
== RDMA_CM_EVENT_CONNECT_REQUEST
)
487 rdma_destroy_id(uevent
->cm_id
);
491 events_reported
= ctx
->events_reported
;
493 return events_reported
;
496 static ssize_t
ucma_destroy_id(struct ucma_file
*file
, const char __user
*inbuf
,
497 int in_len
, int out_len
)
499 struct rdma_ucm_destroy_id cmd
;
500 struct rdma_ucm_destroy_id_resp resp
;
501 struct ucma_context
*ctx
;
504 if (out_len
< sizeof(resp
))
507 if (copy_from_user(&cmd
, inbuf
, sizeof(cmd
)))
511 ctx
= _ucma_find_context(cmd
.id
, file
);
513 idr_remove(&ctx_idr
, ctx
->id
);
520 wait_for_completion(&ctx
->comp
);
521 resp
.events_reported
= ucma_free_ctx(ctx
);
523 if (copy_to_user((void __user
*)(unsigned long)cmd
.response
,
524 &resp
, sizeof(resp
)))
530 static ssize_t
ucma_bind_addr(struct ucma_file
*file
, const char __user
*inbuf
,
531 int in_len
, int out_len
)
533 struct rdma_ucm_bind_addr cmd
;
534 struct ucma_context
*ctx
;
537 if (copy_from_user(&cmd
, inbuf
, sizeof(cmd
)))
540 ctx
= ucma_get_ctx(file
, cmd
.id
);
544 ret
= rdma_bind_addr(ctx
->cm_id
, (struct sockaddr
*) &cmd
.addr
);
549 static ssize_t
ucma_resolve_addr(struct ucma_file
*file
,
550 const char __user
*inbuf
,
551 int in_len
, int out_len
)
553 struct rdma_ucm_resolve_addr cmd
;
554 struct ucma_context
*ctx
;
557 if (copy_from_user(&cmd
, inbuf
, sizeof(cmd
)))
560 ctx
= ucma_get_ctx(file
, cmd
.id
);
564 ret
= rdma_resolve_addr(ctx
->cm_id
, (struct sockaddr
*) &cmd
.src_addr
,
565 (struct sockaddr
*) &cmd
.dst_addr
,
571 static ssize_t
ucma_resolve_route(struct ucma_file
*file
,
572 const char __user
*inbuf
,
573 int in_len
, int out_len
)
575 struct rdma_ucm_resolve_route cmd
;
576 struct ucma_context
*ctx
;
579 if (copy_from_user(&cmd
, inbuf
, sizeof(cmd
)))
582 ctx
= ucma_get_ctx(file
, cmd
.id
);
586 ret
= rdma_resolve_route(ctx
->cm_id
, cmd
.timeout_ms
);
591 static void ucma_copy_ib_route(struct rdma_ucm_query_route_resp
*resp
,
592 struct rdma_route
*route
)
594 struct rdma_dev_addr
*dev_addr
;
596 resp
->num_paths
= route
->num_paths
;
597 switch (route
->num_paths
) {
599 dev_addr
= &route
->addr
.dev_addr
;
600 rdma_addr_get_dgid(dev_addr
,
601 (union ib_gid
*) &resp
->ib_route
[0].dgid
);
602 rdma_addr_get_sgid(dev_addr
,
603 (union ib_gid
*) &resp
->ib_route
[0].sgid
);
604 resp
->ib_route
[0].pkey
= cpu_to_be16(ib_addr_get_pkey(dev_addr
));
607 ib_copy_path_rec_to_user(&resp
->ib_route
[1],
608 &route
->path_rec
[1]);
611 ib_copy_path_rec_to_user(&resp
->ib_route
[0],
612 &route
->path_rec
[0]);
619 static void ucma_copy_iboe_route(struct rdma_ucm_query_route_resp
*resp
,
620 struct rdma_route
*route
)
622 struct rdma_dev_addr
*dev_addr
;
623 struct net_device
*dev
;
626 resp
->num_paths
= route
->num_paths
;
627 switch (route
->num_paths
) {
629 dev_addr
= &route
->addr
.dev_addr
;
630 dev
= dev_get_by_index(&init_net
, dev_addr
->bound_dev_if
);
632 vid
= rdma_vlan_dev_vlan_id(dev
);
636 iboe_mac_vlan_to_ll((union ib_gid
*) &resp
->ib_route
[0].dgid
,
637 dev_addr
->dst_dev_addr
, vid
);
638 iboe_addr_get_sgid(dev_addr
,
639 (union ib_gid
*) &resp
->ib_route
[0].sgid
);
640 resp
->ib_route
[0].pkey
= cpu_to_be16(0xffff);
643 ib_copy_path_rec_to_user(&resp
->ib_route
[1],
644 &route
->path_rec
[1]);
647 ib_copy_path_rec_to_user(&resp
->ib_route
[0],
648 &route
->path_rec
[0]);
655 static void ucma_copy_iw_route(struct rdma_ucm_query_route_resp
*resp
,
656 struct rdma_route
*route
)
658 struct rdma_dev_addr
*dev_addr
;
660 dev_addr
= &route
->addr
.dev_addr
;
661 rdma_addr_get_dgid(dev_addr
, (union ib_gid
*) &resp
->ib_route
[0].dgid
);
662 rdma_addr_get_sgid(dev_addr
, (union ib_gid
*) &resp
->ib_route
[0].sgid
);
665 static ssize_t
ucma_query_route(struct ucma_file
*file
,
666 const char __user
*inbuf
,
667 int in_len
, int out_len
)
669 struct rdma_ucm_query_route cmd
;
670 struct rdma_ucm_query_route_resp resp
;
671 struct ucma_context
*ctx
;
672 struct sockaddr
*addr
;
675 if (out_len
< sizeof(resp
))
678 if (copy_from_user(&cmd
, inbuf
, sizeof(cmd
)))
681 ctx
= ucma_get_ctx(file
, cmd
.id
);
685 memset(&resp
, 0, sizeof resp
);
686 addr
= (struct sockaddr
*) &ctx
->cm_id
->route
.addr
.src_addr
;
687 memcpy(&resp
.src_addr
, addr
, addr
->sa_family
== AF_INET
?
688 sizeof(struct sockaddr_in
) :
689 sizeof(struct sockaddr_in6
));
690 addr
= (struct sockaddr
*) &ctx
->cm_id
->route
.addr
.dst_addr
;
691 memcpy(&resp
.dst_addr
, addr
, addr
->sa_family
== AF_INET
?
692 sizeof(struct sockaddr_in
) :
693 sizeof(struct sockaddr_in6
));
694 if (!ctx
->cm_id
->device
)
697 resp
.node_guid
= (__force __u64
) ctx
->cm_id
->device
->node_guid
;
698 resp
.port_num
= ctx
->cm_id
->port_num
;
699 switch (rdma_node_get_transport(ctx
->cm_id
->device
->node_type
)) {
700 case RDMA_TRANSPORT_IB
:
701 switch (rdma_port_get_link_layer(ctx
->cm_id
->device
,
702 ctx
->cm_id
->port_num
)) {
703 case IB_LINK_LAYER_INFINIBAND
:
704 ucma_copy_ib_route(&resp
, &ctx
->cm_id
->route
);
706 case IB_LINK_LAYER_ETHERNET
:
707 ucma_copy_iboe_route(&resp
, &ctx
->cm_id
->route
);
713 case RDMA_TRANSPORT_IWARP
:
714 ucma_copy_iw_route(&resp
, &ctx
->cm_id
->route
);
721 if (copy_to_user((void __user
*)(unsigned long)cmd
.response
,
722 &resp
, sizeof(resp
)))
729 static void ucma_copy_conn_param(struct rdma_conn_param
*dst
,
730 struct rdma_ucm_conn_param
*src
)
732 dst
->private_data
= src
->private_data
;
733 dst
->private_data_len
= src
->private_data_len
;
734 dst
->responder_resources
=src
->responder_resources
;
735 dst
->initiator_depth
= src
->initiator_depth
;
736 dst
->flow_control
= src
->flow_control
;
737 dst
->retry_count
= src
->retry_count
;
738 dst
->rnr_retry_count
= src
->rnr_retry_count
;
740 dst
->qp_num
= src
->qp_num
;
743 static ssize_t
ucma_connect(struct ucma_file
*file
, const char __user
*inbuf
,
744 int in_len
, int out_len
)
746 struct rdma_ucm_connect cmd
;
747 struct rdma_conn_param conn_param
;
748 struct ucma_context
*ctx
;
751 if (copy_from_user(&cmd
, inbuf
, sizeof(cmd
)))
754 if (!cmd
.conn_param
.valid
)
757 ctx
= ucma_get_ctx(file
, cmd
.id
);
761 ucma_copy_conn_param(&conn_param
, &cmd
.conn_param
);
762 ret
= rdma_connect(ctx
->cm_id
, &conn_param
);
767 static ssize_t
ucma_listen(struct ucma_file
*file
, const char __user
*inbuf
,
768 int in_len
, int out_len
)
770 struct rdma_ucm_listen cmd
;
771 struct ucma_context
*ctx
;
774 if (copy_from_user(&cmd
, inbuf
, sizeof(cmd
)))
777 ctx
= ucma_get_ctx(file
, cmd
.id
);
781 ctx
->backlog
= cmd
.backlog
> 0 && cmd
.backlog
< max_backlog
?
782 cmd
.backlog
: max_backlog
;
783 ret
= rdma_listen(ctx
->cm_id
, ctx
->backlog
);
788 static ssize_t
ucma_accept(struct ucma_file
*file
, const char __user
*inbuf
,
789 int in_len
, int out_len
)
791 struct rdma_ucm_accept cmd
;
792 struct rdma_conn_param conn_param
;
793 struct ucma_context
*ctx
;
796 if (copy_from_user(&cmd
, inbuf
, sizeof(cmd
)))
799 ctx
= ucma_get_ctx(file
, cmd
.id
);
803 if (cmd
.conn_param
.valid
) {
804 ucma_copy_conn_param(&conn_param
, &cmd
.conn_param
);
805 mutex_lock(&file
->mut
);
806 ret
= rdma_accept(ctx
->cm_id
, &conn_param
);
809 mutex_unlock(&file
->mut
);
811 ret
= rdma_accept(ctx
->cm_id
, NULL
);
817 static ssize_t
ucma_reject(struct ucma_file
*file
, const char __user
*inbuf
,
818 int in_len
, int out_len
)
820 struct rdma_ucm_reject cmd
;
821 struct ucma_context
*ctx
;
824 if (copy_from_user(&cmd
, inbuf
, sizeof(cmd
)))
827 ctx
= ucma_get_ctx(file
, cmd
.id
);
831 ret
= rdma_reject(ctx
->cm_id
, cmd
.private_data
, cmd
.private_data_len
);
836 static ssize_t
ucma_disconnect(struct ucma_file
*file
, const char __user
*inbuf
,
837 int in_len
, int out_len
)
839 struct rdma_ucm_disconnect cmd
;
840 struct ucma_context
*ctx
;
843 if (copy_from_user(&cmd
, inbuf
, sizeof(cmd
)))
846 ctx
= ucma_get_ctx(file
, cmd
.id
);
850 ret
= rdma_disconnect(ctx
->cm_id
);
855 static ssize_t
ucma_init_qp_attr(struct ucma_file
*file
,
856 const char __user
*inbuf
,
857 int in_len
, int out_len
)
859 struct rdma_ucm_init_qp_attr cmd
;
860 struct ib_uverbs_qp_attr resp
;
861 struct ucma_context
*ctx
;
862 struct ib_qp_attr qp_attr
;
865 if (out_len
< sizeof(resp
))
868 if (copy_from_user(&cmd
, inbuf
, sizeof(cmd
)))
871 ctx
= ucma_get_ctx(file
, cmd
.id
);
875 resp
.qp_attr_mask
= 0;
876 memset(&qp_attr
, 0, sizeof qp_attr
);
877 qp_attr
.qp_state
= cmd
.qp_state
;
878 ret
= rdma_init_qp_attr(ctx
->cm_id
, &qp_attr
, &resp
.qp_attr_mask
);
882 ib_copy_qp_attr_to_user(&resp
, &qp_attr
);
883 if (copy_to_user((void __user
*)(unsigned long)cmd
.response
,
884 &resp
, sizeof(resp
)))
892 static int ucma_set_option_id(struct ucma_context
*ctx
, int optname
,
893 void *optval
, size_t optlen
)
898 case RDMA_OPTION_ID_TOS
:
899 if (optlen
!= sizeof(u8
)) {
903 rdma_set_service_type(ctx
->cm_id
, *((u8
*) optval
));
905 case RDMA_OPTION_ID_REUSEADDR
:
906 if (optlen
!= sizeof(int)) {
910 ret
= rdma_set_reuseaddr(ctx
->cm_id
, *((int *) optval
) ? 1 : 0);
919 static int ucma_set_ib_path(struct ucma_context
*ctx
,
920 struct ib_path_rec_data
*path_data
, size_t optlen
)
922 struct ib_sa_path_rec sa_path
;
923 struct rdma_cm_event event
;
926 if (optlen
% sizeof(*path_data
))
929 for (; optlen
; optlen
-= sizeof(*path_data
), path_data
++) {
930 if (path_data
->flags
== (IB_PATH_GMP
| IB_PATH_PRIMARY
|
931 IB_PATH_BIDIRECTIONAL
))
938 ib_sa_unpack_path(path_data
->path_rec
, &sa_path
);
939 ret
= rdma_set_ib_paths(ctx
->cm_id
, &sa_path
, 1);
943 memset(&event
, 0, sizeof event
);
944 event
.event
= RDMA_CM_EVENT_ROUTE_RESOLVED
;
945 return ucma_event_handler(ctx
->cm_id
, &event
);
948 static int ucma_set_option_ib(struct ucma_context
*ctx
, int optname
,
949 void *optval
, size_t optlen
)
954 case RDMA_OPTION_IB_PATH
:
955 ret
= ucma_set_ib_path(ctx
, optval
, optlen
);
964 static int ucma_set_option_level(struct ucma_context
*ctx
, int level
,
965 int optname
, void *optval
, size_t optlen
)
971 ret
= ucma_set_option_id(ctx
, optname
, optval
, optlen
);
974 ret
= ucma_set_option_ib(ctx
, optname
, optval
, optlen
);
983 static ssize_t
ucma_set_option(struct ucma_file
*file
, const char __user
*inbuf
,
984 int in_len
, int out_len
)
986 struct rdma_ucm_set_option cmd
;
987 struct ucma_context
*ctx
;
991 if (copy_from_user(&cmd
, inbuf
, sizeof(cmd
)))
994 ctx
= ucma_get_ctx(file
, cmd
.id
);
998 optval
= kmalloc(cmd
.optlen
, GFP_KERNEL
);
1004 if (copy_from_user(optval
, (void __user
*) (unsigned long) cmd
.optval
,
1010 ret
= ucma_set_option_level(ctx
, cmd
.level
, cmd
.optname
, optval
,
1019 static ssize_t
ucma_notify(struct ucma_file
*file
, const char __user
*inbuf
,
1020 int in_len
, int out_len
)
1022 struct rdma_ucm_notify cmd
;
1023 struct ucma_context
*ctx
;
1026 if (copy_from_user(&cmd
, inbuf
, sizeof(cmd
)))
1029 ctx
= ucma_get_ctx(file
, cmd
.id
);
1031 return PTR_ERR(ctx
);
1033 ret
= rdma_notify(ctx
->cm_id
, (enum ib_event_type
) cmd
.event
);
1038 static ssize_t
ucma_join_multicast(struct ucma_file
*file
,
1039 const char __user
*inbuf
,
1040 int in_len
, int out_len
)
1042 struct rdma_ucm_join_mcast cmd
;
1043 struct rdma_ucm_create_id_resp resp
;
1044 struct ucma_context
*ctx
;
1045 struct ucma_multicast
*mc
;
1048 if (out_len
< sizeof(resp
))
1051 if (copy_from_user(&cmd
, inbuf
, sizeof(cmd
)))
1054 ctx
= ucma_get_ctx(file
, cmd
.id
);
1056 return PTR_ERR(ctx
);
1058 mutex_lock(&file
->mut
);
1059 mc
= ucma_alloc_multicast(ctx
);
1066 memcpy(&mc
->addr
, &cmd
.addr
, sizeof cmd
.addr
);
1067 ret
= rdma_join_multicast(ctx
->cm_id
, (struct sockaddr
*) &mc
->addr
, mc
);
1072 if (copy_to_user((void __user
*)(unsigned long)cmd
.response
,
1073 &resp
, sizeof(resp
))) {
1078 mutex_unlock(&file
->mut
);
1083 rdma_leave_multicast(ctx
->cm_id
, (struct sockaddr
*) &mc
->addr
);
1084 ucma_cleanup_mc_events(mc
);
1087 idr_remove(&multicast_idr
, mc
->id
);
1089 list_del(&mc
->list
);
1092 mutex_unlock(&file
->mut
);
1097 static ssize_t
ucma_leave_multicast(struct ucma_file
*file
,
1098 const char __user
*inbuf
,
1099 int in_len
, int out_len
)
1101 struct rdma_ucm_destroy_id cmd
;
1102 struct rdma_ucm_destroy_id_resp resp
;
1103 struct ucma_multicast
*mc
;
1106 if (out_len
< sizeof(resp
))
1109 if (copy_from_user(&cmd
, inbuf
, sizeof(cmd
)))
1113 mc
= idr_find(&multicast_idr
, cmd
.id
);
1115 mc
= ERR_PTR(-ENOENT
);
1116 else if (mc
->ctx
->file
!= file
)
1117 mc
= ERR_PTR(-EINVAL
);
1119 idr_remove(&multicast_idr
, mc
->id
);
1120 atomic_inc(&mc
->ctx
->ref
);
1129 rdma_leave_multicast(mc
->ctx
->cm_id
, (struct sockaddr
*) &mc
->addr
);
1130 mutex_lock(&mc
->ctx
->file
->mut
);
1131 ucma_cleanup_mc_events(mc
);
1132 list_del(&mc
->list
);
1133 mutex_unlock(&mc
->ctx
->file
->mut
);
1135 ucma_put_ctx(mc
->ctx
);
1136 resp
.events_reported
= mc
->events_reported
;
1139 if (copy_to_user((void __user
*)(unsigned long)cmd
.response
,
1140 &resp
, sizeof(resp
)))
1146 static void ucma_lock_files(struct ucma_file
*file1
, struct ucma_file
*file2
)
1148 /* Acquire mutex's based on pointer comparison to prevent deadlock. */
1149 if (file1
< file2
) {
1150 mutex_lock(&file1
->mut
);
1151 mutex_lock(&file2
->mut
);
1153 mutex_lock(&file2
->mut
);
1154 mutex_lock(&file1
->mut
);
1158 static void ucma_unlock_files(struct ucma_file
*file1
, struct ucma_file
*file2
)
1160 if (file1
< file2
) {
1161 mutex_unlock(&file2
->mut
);
1162 mutex_unlock(&file1
->mut
);
1164 mutex_unlock(&file1
->mut
);
1165 mutex_unlock(&file2
->mut
);
1169 static void ucma_move_events(struct ucma_context
*ctx
, struct ucma_file
*file
)
1171 struct ucma_event
*uevent
, *tmp
;
1173 list_for_each_entry_safe(uevent
, tmp
, &ctx
->file
->event_list
, list
)
1174 if (uevent
->ctx
== ctx
)
1175 list_move_tail(&uevent
->list
, &file
->event_list
);
1178 static ssize_t
ucma_migrate_id(struct ucma_file
*new_file
,
1179 const char __user
*inbuf
,
1180 int in_len
, int out_len
)
1182 struct rdma_ucm_migrate_id cmd
;
1183 struct rdma_ucm_migrate_resp resp
;
1184 struct ucma_context
*ctx
;
1186 struct ucma_file
*cur_file
;
1189 if (copy_from_user(&cmd
, inbuf
, sizeof(cmd
)))
1192 /* Get current fd to protect against it being closed */
1193 filp
= fget(cmd
.fd
);
1197 /* Validate current fd and prevent destruction of id. */
1198 ctx
= ucma_get_ctx(filp
->private_data
, cmd
.id
);
1204 cur_file
= ctx
->file
;
1205 if (cur_file
== new_file
) {
1206 resp
.events_reported
= ctx
->events_reported
;
1211 * Migrate events between fd's, maintaining order, and avoiding new
1212 * events being added before existing events.
1214 ucma_lock_files(cur_file
, new_file
);
1217 list_move_tail(&ctx
->list
, &new_file
->ctx_list
);
1218 ucma_move_events(ctx
, new_file
);
1219 ctx
->file
= new_file
;
1220 resp
.events_reported
= ctx
->events_reported
;
1223 ucma_unlock_files(cur_file
, new_file
);
1226 if (copy_to_user((void __user
*)(unsigned long)cmd
.response
,
1227 &resp
, sizeof(resp
)))
1236 static ssize_t (*ucma_cmd_table
[])(struct ucma_file
*file
,
1237 const char __user
*inbuf
,
1238 int in_len
, int out_len
) = {
1239 [RDMA_USER_CM_CMD_CREATE_ID
] = ucma_create_id
,
1240 [RDMA_USER_CM_CMD_DESTROY_ID
] = ucma_destroy_id
,
1241 [RDMA_USER_CM_CMD_BIND_ADDR
] = ucma_bind_addr
,
1242 [RDMA_USER_CM_CMD_RESOLVE_ADDR
] = ucma_resolve_addr
,
1243 [RDMA_USER_CM_CMD_RESOLVE_ROUTE
]= ucma_resolve_route
,
1244 [RDMA_USER_CM_CMD_QUERY_ROUTE
] = ucma_query_route
,
1245 [RDMA_USER_CM_CMD_CONNECT
] = ucma_connect
,
1246 [RDMA_USER_CM_CMD_LISTEN
] = ucma_listen
,
1247 [RDMA_USER_CM_CMD_ACCEPT
] = ucma_accept
,
1248 [RDMA_USER_CM_CMD_REJECT
] = ucma_reject
,
1249 [RDMA_USER_CM_CMD_DISCONNECT
] = ucma_disconnect
,
1250 [RDMA_USER_CM_CMD_INIT_QP_ATTR
] = ucma_init_qp_attr
,
1251 [RDMA_USER_CM_CMD_GET_EVENT
] = ucma_get_event
,
1252 [RDMA_USER_CM_CMD_GET_OPTION
] = NULL
,
1253 [RDMA_USER_CM_CMD_SET_OPTION
] = ucma_set_option
,
1254 [RDMA_USER_CM_CMD_NOTIFY
] = ucma_notify
,
1255 [RDMA_USER_CM_CMD_JOIN_MCAST
] = ucma_join_multicast
,
1256 [RDMA_USER_CM_CMD_LEAVE_MCAST
] = ucma_leave_multicast
,
1257 [RDMA_USER_CM_CMD_MIGRATE_ID
] = ucma_migrate_id
1260 static ssize_t
ucma_write(struct file
*filp
, const char __user
*buf
,
1261 size_t len
, loff_t
*pos
)
1263 struct ucma_file
*file
= filp
->private_data
;
1264 struct rdma_ucm_cmd_hdr hdr
;
1267 if (len
< sizeof(hdr
))
1270 if (copy_from_user(&hdr
, buf
, sizeof(hdr
)))
1273 if (hdr
.cmd
>= ARRAY_SIZE(ucma_cmd_table
))
1276 if (hdr
.in
+ sizeof(hdr
) > len
)
1279 if (!ucma_cmd_table
[hdr
.cmd
])
1282 ret
= ucma_cmd_table
[hdr
.cmd
](file
, buf
+ sizeof(hdr
), hdr
.in
, hdr
.out
);
1289 static unsigned int ucma_poll(struct file
*filp
, struct poll_table_struct
*wait
)
1291 struct ucma_file
*file
= filp
->private_data
;
1292 unsigned int mask
= 0;
1294 poll_wait(filp
, &file
->poll_wait
, wait
);
1296 if (!list_empty(&file
->event_list
))
1297 mask
= POLLIN
| POLLRDNORM
;
1303 * ucma_open() does not need the BKL:
1305 * - no global state is referred to;
1306 * - there is no ioctl method to race against;
1307 * - no further module initialization is required for open to work
1308 * after the device is registered.
1310 static int ucma_open(struct inode
*inode
, struct file
*filp
)
1312 struct ucma_file
*file
;
1314 file
= kmalloc(sizeof *file
, GFP_KERNEL
);
1318 INIT_LIST_HEAD(&file
->event_list
);
1319 INIT_LIST_HEAD(&file
->ctx_list
);
1320 init_waitqueue_head(&file
->poll_wait
);
1321 mutex_init(&file
->mut
);
1323 filp
->private_data
= file
;
1326 return nonseekable_open(inode
, filp
);
1329 static int ucma_close(struct inode
*inode
, struct file
*filp
)
1331 struct ucma_file
*file
= filp
->private_data
;
1332 struct ucma_context
*ctx
, *tmp
;
1334 mutex_lock(&file
->mut
);
1335 list_for_each_entry_safe(ctx
, tmp
, &file
->ctx_list
, list
) {
1336 mutex_unlock(&file
->mut
);
1339 idr_remove(&ctx_idr
, ctx
->id
);
1343 mutex_lock(&file
->mut
);
1345 mutex_unlock(&file
->mut
);
1350 static const struct file_operations ucma_fops
= {
1351 .owner
= THIS_MODULE
,
1353 .release
= ucma_close
,
1354 .write
= ucma_write
,
1356 .llseek
= no_llseek
,
1359 static struct miscdevice ucma_misc
= {
1360 .minor
= MISC_DYNAMIC_MINOR
,
1362 .nodename
= "infiniband/rdma_cm",
1367 static ssize_t
show_abi_version(struct device
*dev
,
1368 struct device_attribute
*attr
,
1371 return sprintf(buf
, "%d\n", RDMA_USER_CM_ABI_VERSION
);
1373 static DEVICE_ATTR(abi_version
, S_IRUGO
, show_abi_version
, NULL
);
1375 static int __init
ucma_init(void)
1379 ret
= misc_register(&ucma_misc
);
1383 ret
= device_create_file(ucma_misc
.this_device
, &dev_attr_abi_version
);
1385 printk(KERN_ERR
"rdma_ucm: couldn't create abi_version attr\n");
1389 ucma_ctl_table_hdr
= register_net_sysctl(&init_net
, "net/rdma_ucm", ucma_ctl_table
);
1390 if (!ucma_ctl_table_hdr
) {
1391 printk(KERN_ERR
"rdma_ucm: couldn't register sysctl paths\n");
1397 device_remove_file(ucma_misc
.this_device
, &dev_attr_abi_version
);
1399 misc_deregister(&ucma_misc
);
1403 static void __exit
ucma_cleanup(void)
1405 unregister_net_sysctl_table(ucma_ctl_table_hdr
);
1406 device_remove_file(ucma_misc
.this_device
, &dev_attr_abi_version
);
1407 misc_deregister(&ucma_misc
);
1408 idr_destroy(&ctx_idr
);
1411 module_init(ucma_init
);
1412 module_exit(ucma_cleanup
);