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>
45 #include <linux/nsproxy.h>
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>
54 MODULE_AUTHOR("Sean Hefty");
55 MODULE_DESCRIPTION("RDMA Userspace Connection Manager Access");
56 MODULE_LICENSE("Dual BSD/GPL");
58 static unsigned int max_backlog = 1024;
60 static struct ctl_table_header *ucma_ctl_table_hdr;
61 static struct ctl_table ucma_ctl_table[] = {
63 .procname = "max_backlog",
65 .maxlen = sizeof max_backlog,
67 .proc_handler = proc_dointvec,
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;
83 struct completion comp;
88 struct ucma_file *file;
89 struct rdma_cm_id *cm_id;
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
98 /* sync between removal event and id destroy, protected by file mut */
100 struct work_struct close_work;
103 struct ucma_multicast {
104 struct ucma_context *ctx;
110 struct list_head list;
111 struct sockaddr_storage addr;
115 struct ucma_context *ctx;
116 struct ucma_multicast *mc;
117 struct list_head list;
118 struct rdma_cm_id *cm_id;
119 struct rdma_ucm_event_resp resp;
120 struct work_struct close_work;
123 static DEFINE_MUTEX(mut);
124 static DEFINE_IDR(ctx_idr);
125 static DEFINE_IDR(multicast_idr);
127 static inline struct ucma_context *_ucma_find_context(int id,
128 struct ucma_file *file)
130 struct ucma_context *ctx;
132 ctx = idr_find(&ctx_idr, id);
134 ctx = ERR_PTR(-ENOENT);
135 else if (ctx->file != file)
136 ctx = ERR_PTR(-EINVAL);
140 static struct ucma_context *ucma_get_ctx(struct ucma_file *file, int id)
142 struct ucma_context *ctx;
145 ctx = _ucma_find_context(id, file);
150 atomic_inc(&ctx->ref);
156 static void ucma_put_ctx(struct ucma_context *ctx)
158 if (atomic_dec_and_test(&ctx->ref))
159 complete(&ctx->comp);
162 static void ucma_close_event_id(struct work_struct *work)
164 struct ucma_event *uevent_close = container_of(work, struct ucma_event, close_work);
166 rdma_destroy_id(uevent_close->cm_id);
170 static void ucma_close_id(struct work_struct *work)
172 struct ucma_context *ctx = container_of(work, struct ucma_context, close_work);
174 /* once all inflight tasks are finished, we close all underlying
175 * resources. The context is still alive till its explicit destryoing
179 wait_for_completion(&ctx->comp);
180 /* No new events will be generated after destroying the id. */
181 rdma_destroy_id(ctx->cm_id);
184 static struct ucma_context *ucma_alloc_ctx(struct ucma_file *file)
186 struct ucma_context *ctx;
188 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
192 INIT_WORK(&ctx->close_work, ucma_close_id);
193 atomic_set(&ctx->ref, 1);
194 init_completion(&ctx->comp);
195 INIT_LIST_HEAD(&ctx->mc_list);
199 ctx->id = idr_alloc(&ctx_idr, ctx, 0, 0, GFP_KERNEL);
204 list_add_tail(&ctx->list, &file->ctx_list);
212 static struct ucma_multicast* ucma_alloc_multicast(struct ucma_context *ctx)
214 struct ucma_multicast *mc;
216 mc = kzalloc(sizeof(*mc), GFP_KERNEL);
221 mc->id = idr_alloc(&multicast_idr, mc, 0, 0, GFP_KERNEL);
227 list_add_tail(&mc->list, &ctx->mc_list);
235 static void ucma_copy_conn_event(struct rdma_ucm_conn_param *dst,
236 struct rdma_conn_param *src)
238 if (src->private_data_len)
239 memcpy(dst->private_data, src->private_data,
240 src->private_data_len);
241 dst->private_data_len = src->private_data_len;
242 dst->responder_resources =src->responder_resources;
243 dst->initiator_depth = src->initiator_depth;
244 dst->flow_control = src->flow_control;
245 dst->retry_count = src->retry_count;
246 dst->rnr_retry_count = src->rnr_retry_count;
248 dst->qp_num = src->qp_num;
251 static void ucma_copy_ud_event(struct ib_device *device,
252 struct rdma_ucm_ud_param *dst,
253 struct rdma_ud_param *src)
255 if (src->private_data_len)
256 memcpy(dst->private_data, src->private_data,
257 src->private_data_len);
258 dst->private_data_len = src->private_data_len;
259 ib_copy_ah_attr_to_user(device, &dst->ah_attr, &src->ah_attr);
260 dst->qp_num = src->qp_num;
261 dst->qkey = src->qkey;
264 static void ucma_set_event_context(struct ucma_context *ctx,
265 struct rdma_cm_event *event,
266 struct ucma_event *uevent)
269 switch (event->event) {
270 case RDMA_CM_EVENT_MULTICAST_JOIN:
271 case RDMA_CM_EVENT_MULTICAST_ERROR:
272 uevent->mc = (struct ucma_multicast *)
273 event->param.ud.private_data;
274 uevent->resp.uid = uevent->mc->uid;
275 uevent->resp.id = uevent->mc->id;
278 uevent->resp.uid = ctx->uid;
279 uevent->resp.id = ctx->id;
284 /* Called with file->mut locked for the relevant context. */
285 static void ucma_removal_event_handler(struct rdma_cm_id *cm_id)
287 struct ucma_context *ctx = cm_id->context;
288 struct ucma_event *con_req_eve;
294 /* only if context is pointing to cm_id that it owns it and can be
295 * queued to be closed, otherwise that cm_id is an inflight one that
296 * is part of that context event list pending to be detached and
297 * reattached to its new context as part of ucma_get_event,
298 * handled separately below.
300 if (ctx->cm_id == cm_id) {
304 queue_work(ctx->file->close_wq, &ctx->close_work);
308 list_for_each_entry(con_req_eve, &ctx->file->event_list, list) {
309 if (con_req_eve->cm_id == cm_id &&
310 con_req_eve->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST) {
311 list_del(&con_req_eve->list);
312 INIT_WORK(&con_req_eve->close_work, ucma_close_event_id);
313 queue_work(ctx->file->close_wq, &con_req_eve->close_work);
319 pr_err("ucma_removal_event_handler: warning: connect request event wasn't found\n");
322 static int ucma_event_handler(struct rdma_cm_id *cm_id,
323 struct rdma_cm_event *event)
325 struct ucma_event *uevent;
326 struct ucma_context *ctx = cm_id->context;
329 uevent = kzalloc(sizeof(*uevent), GFP_KERNEL);
331 return event->event == RDMA_CM_EVENT_CONNECT_REQUEST;
333 mutex_lock(&ctx->file->mut);
334 uevent->cm_id = cm_id;
335 ucma_set_event_context(ctx, event, uevent);
336 uevent->resp.event = event->event;
337 uevent->resp.status = event->status;
338 if (cm_id->qp_type == IB_QPT_UD)
339 ucma_copy_ud_event(cm_id->device, &uevent->resp.param.ud,
342 ucma_copy_conn_event(&uevent->resp.param.conn,
345 if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST) {
352 } else if (!ctx->uid || ctx->cm_id != cm_id) {
354 * We ignore events for new connections until userspace has set
355 * their context. This can only happen if an error occurs on a
356 * new connection before the user accepts it. This is okay,
357 * since the accept will just fail later. However, we do need
358 * to release the underlying HW resources in case of a device
361 if (event->event == RDMA_CM_EVENT_DEVICE_REMOVAL)
362 ucma_removal_event_handler(cm_id);
368 list_add_tail(&uevent->list, &ctx->file->event_list);
369 wake_up_interruptible(&ctx->file->poll_wait);
370 if (event->event == RDMA_CM_EVENT_DEVICE_REMOVAL)
371 ucma_removal_event_handler(cm_id);
373 mutex_unlock(&ctx->file->mut);
377 static ssize_t ucma_get_event(struct ucma_file *file, const char __user *inbuf,
378 int in_len, int out_len)
380 struct ucma_context *ctx;
381 struct rdma_ucm_get_event cmd;
382 struct ucma_event *uevent;
385 if (out_len < sizeof uevent->resp)
388 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
391 mutex_lock(&file->mut);
392 while (list_empty(&file->event_list)) {
393 mutex_unlock(&file->mut);
395 if (file->filp->f_flags & O_NONBLOCK)
398 if (wait_event_interruptible(file->poll_wait,
399 !list_empty(&file->event_list)))
402 mutex_lock(&file->mut);
405 uevent = list_entry(file->event_list.next, struct ucma_event, list);
407 if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST) {
408 ctx = ucma_alloc_ctx(file);
413 uevent->ctx->backlog++;
414 ctx->cm_id = uevent->cm_id;
415 ctx->cm_id->context = ctx;
416 uevent->resp.id = ctx->id;
419 if (copy_to_user((void __user *)(unsigned long)cmd.response,
420 &uevent->resp, sizeof uevent->resp)) {
425 list_del(&uevent->list);
426 uevent->ctx->events_reported++;
428 uevent->mc->events_reported++;
431 mutex_unlock(&file->mut);
435 static int ucma_get_qp_type(struct rdma_ucm_create_id *cmd, enum ib_qp_type *qp_type)
439 *qp_type = IB_QPT_RC;
443 *qp_type = IB_QPT_UD;
446 *qp_type = cmd->qp_type;
453 static ssize_t ucma_create_id(struct ucma_file *file, const char __user *inbuf,
454 int in_len, int out_len)
456 struct rdma_ucm_create_id cmd;
457 struct rdma_ucm_create_id_resp resp;
458 struct ucma_context *ctx;
459 enum ib_qp_type qp_type;
462 if (out_len < sizeof(resp))
465 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
468 ret = ucma_get_qp_type(&cmd, &qp_type);
472 mutex_lock(&file->mut);
473 ctx = ucma_alloc_ctx(file);
474 mutex_unlock(&file->mut);
479 ctx->cm_id = rdma_create_id(current->nsproxy->net_ns,
480 ucma_event_handler, ctx, cmd.ps, qp_type);
481 if (IS_ERR(ctx->cm_id)) {
482 ret = PTR_ERR(ctx->cm_id);
487 if (copy_to_user((void __user *)(unsigned long)cmd.response,
488 &resp, sizeof(resp))) {
495 rdma_destroy_id(ctx->cm_id);
498 idr_remove(&ctx_idr, ctx->id);
504 static void ucma_cleanup_multicast(struct ucma_context *ctx)
506 struct ucma_multicast *mc, *tmp;
509 list_for_each_entry_safe(mc, tmp, &ctx->mc_list, list) {
511 idr_remove(&multicast_idr, mc->id);
517 static void ucma_cleanup_mc_events(struct ucma_multicast *mc)
519 struct ucma_event *uevent, *tmp;
521 list_for_each_entry_safe(uevent, tmp, &mc->ctx->file->event_list, list) {
522 if (uevent->mc != mc)
525 list_del(&uevent->list);
531 * ucma_free_ctx is called after the underlying rdma CM-ID is destroyed. At
532 * this point, no new events will be reported from the hardware. However, we
533 * still need to cleanup the UCMA context for this ID. Specifically, there
534 * might be events that have not yet been consumed by the user space software.
535 * These might include pending connect requests which we have not completed
536 * processing. We cannot call rdma_destroy_id while holding the lock of the
537 * context (file->mut), as it might cause a deadlock. We therefore extract all
538 * relevant events from the context pending events list while holding the
539 * mutex. After that we release them as needed.
541 static int ucma_free_ctx(struct ucma_context *ctx)
544 struct ucma_event *uevent, *tmp;
548 ucma_cleanup_multicast(ctx);
550 /* Cleanup events not yet reported to the user. */
551 mutex_lock(&ctx->file->mut);
552 list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list) {
553 if (uevent->ctx == ctx)
554 list_move_tail(&uevent->list, &list);
556 list_del(&ctx->list);
557 mutex_unlock(&ctx->file->mut);
559 list_for_each_entry_safe(uevent, tmp, &list, list) {
560 list_del(&uevent->list);
561 if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST)
562 rdma_destroy_id(uevent->cm_id);
566 events_reported = ctx->events_reported;
568 return events_reported;
571 static ssize_t ucma_destroy_id(struct ucma_file *file, const char __user *inbuf,
572 int in_len, int out_len)
574 struct rdma_ucm_destroy_id cmd;
575 struct rdma_ucm_destroy_id_resp resp;
576 struct ucma_context *ctx;
579 if (out_len < sizeof(resp))
582 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
586 ctx = _ucma_find_context(cmd.id, file);
588 idr_remove(&ctx_idr, ctx->id);
594 mutex_lock(&ctx->file->mut);
596 mutex_unlock(&ctx->file->mut);
598 flush_workqueue(ctx->file->close_wq);
599 /* At this point it's guaranteed that there is no inflight
605 wait_for_completion(&ctx->comp);
606 rdma_destroy_id(ctx->cm_id);
611 resp.events_reported = ucma_free_ctx(ctx);
612 if (copy_to_user((void __user *)(unsigned long)cmd.response,
613 &resp, sizeof(resp)))
619 static ssize_t ucma_bind_ip(struct ucma_file *file, const char __user *inbuf,
620 int in_len, int out_len)
622 struct rdma_ucm_bind_ip cmd;
623 struct ucma_context *ctx;
626 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
629 ctx = ucma_get_ctx(file, cmd.id);
633 ret = rdma_bind_addr(ctx->cm_id, (struct sockaddr *) &cmd.addr);
638 static ssize_t ucma_bind(struct ucma_file *file, const char __user *inbuf,
639 int in_len, int out_len)
641 struct rdma_ucm_bind cmd;
642 struct sockaddr *addr;
643 struct ucma_context *ctx;
646 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
649 addr = (struct sockaddr *) &cmd.addr;
650 if (cmd.reserved || !cmd.addr_size || (cmd.addr_size != rdma_addr_size(addr)))
653 ctx = ucma_get_ctx(file, cmd.id);
657 ret = rdma_bind_addr(ctx->cm_id, addr);
662 static ssize_t ucma_resolve_ip(struct ucma_file *file,
663 const char __user *inbuf,
664 int in_len, int out_len)
666 struct rdma_ucm_resolve_ip cmd;
667 struct ucma_context *ctx;
670 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
673 ctx = ucma_get_ctx(file, cmd.id);
677 ret = rdma_resolve_addr(ctx->cm_id, (struct sockaddr *) &cmd.src_addr,
678 (struct sockaddr *) &cmd.dst_addr,
684 static ssize_t ucma_resolve_addr(struct ucma_file *file,
685 const char __user *inbuf,
686 int in_len, int out_len)
688 struct rdma_ucm_resolve_addr cmd;
689 struct sockaddr *src, *dst;
690 struct ucma_context *ctx;
693 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
696 src = (struct sockaddr *) &cmd.src_addr;
697 dst = (struct sockaddr *) &cmd.dst_addr;
698 if (cmd.reserved || (cmd.src_size && (cmd.src_size != rdma_addr_size(src))) ||
699 !cmd.dst_size || (cmd.dst_size != rdma_addr_size(dst)))
702 ctx = ucma_get_ctx(file, cmd.id);
706 ret = rdma_resolve_addr(ctx->cm_id, src, dst, cmd.timeout_ms);
711 static ssize_t ucma_resolve_route(struct ucma_file *file,
712 const char __user *inbuf,
713 int in_len, int out_len)
715 struct rdma_ucm_resolve_route cmd;
716 struct ucma_context *ctx;
719 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
722 ctx = ucma_get_ctx(file, cmd.id);
726 ret = rdma_resolve_route(ctx->cm_id, cmd.timeout_ms);
731 static void ucma_copy_ib_route(struct rdma_ucm_query_route_resp *resp,
732 struct rdma_route *route)
734 struct rdma_dev_addr *dev_addr;
736 resp->num_paths = route->num_paths;
737 switch (route->num_paths) {
739 dev_addr = &route->addr.dev_addr;
740 rdma_addr_get_dgid(dev_addr,
741 (union ib_gid *) &resp->ib_route[0].dgid);
742 rdma_addr_get_sgid(dev_addr,
743 (union ib_gid *) &resp->ib_route[0].sgid);
744 resp->ib_route[0].pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
747 ib_copy_path_rec_to_user(&resp->ib_route[1],
748 &route->path_rec[1]);
751 ib_copy_path_rec_to_user(&resp->ib_route[0],
752 &route->path_rec[0]);
759 static void ucma_copy_iboe_route(struct rdma_ucm_query_route_resp *resp,
760 struct rdma_route *route)
763 resp->num_paths = route->num_paths;
764 switch (route->num_paths) {
766 rdma_ip2gid((struct sockaddr *)&route->addr.dst_addr,
767 (union ib_gid *)&resp->ib_route[0].dgid);
768 rdma_ip2gid((struct sockaddr *)&route->addr.src_addr,
769 (union ib_gid *)&resp->ib_route[0].sgid);
770 resp->ib_route[0].pkey = cpu_to_be16(0xffff);
773 ib_copy_path_rec_to_user(&resp->ib_route[1],
774 &route->path_rec[1]);
777 ib_copy_path_rec_to_user(&resp->ib_route[0],
778 &route->path_rec[0]);
785 static void ucma_copy_iw_route(struct rdma_ucm_query_route_resp *resp,
786 struct rdma_route *route)
788 struct rdma_dev_addr *dev_addr;
790 dev_addr = &route->addr.dev_addr;
791 rdma_addr_get_dgid(dev_addr, (union ib_gid *) &resp->ib_route[0].dgid);
792 rdma_addr_get_sgid(dev_addr, (union ib_gid *) &resp->ib_route[0].sgid);
795 static ssize_t ucma_query_route(struct ucma_file *file,
796 const char __user *inbuf,
797 int in_len, int out_len)
799 struct rdma_ucm_query cmd;
800 struct rdma_ucm_query_route_resp resp;
801 struct ucma_context *ctx;
802 struct sockaddr *addr;
805 if (out_len < sizeof(resp))
808 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
811 ctx = ucma_get_ctx(file, cmd.id);
815 memset(&resp, 0, sizeof resp);
816 addr = (struct sockaddr *) &ctx->cm_id->route.addr.src_addr;
817 memcpy(&resp.src_addr, addr, addr->sa_family == AF_INET ?
818 sizeof(struct sockaddr_in) :
819 sizeof(struct sockaddr_in6));
820 addr = (struct sockaddr *) &ctx->cm_id->route.addr.dst_addr;
821 memcpy(&resp.dst_addr, addr, addr->sa_family == AF_INET ?
822 sizeof(struct sockaddr_in) :
823 sizeof(struct sockaddr_in6));
824 if (!ctx->cm_id->device)
827 resp.node_guid = (__force __u64) ctx->cm_id->device->node_guid;
828 resp.port_num = ctx->cm_id->port_num;
830 if (rdma_cap_ib_sa(ctx->cm_id->device, ctx->cm_id->port_num))
831 ucma_copy_ib_route(&resp, &ctx->cm_id->route);
832 else if (rdma_protocol_roce(ctx->cm_id->device, ctx->cm_id->port_num))
833 ucma_copy_iboe_route(&resp, &ctx->cm_id->route);
834 else if (rdma_protocol_iwarp(ctx->cm_id->device, ctx->cm_id->port_num))
835 ucma_copy_iw_route(&resp, &ctx->cm_id->route);
838 if (copy_to_user((void __user *)(unsigned long)cmd.response,
839 &resp, sizeof(resp)))
846 static void ucma_query_device_addr(struct rdma_cm_id *cm_id,
847 struct rdma_ucm_query_addr_resp *resp)
852 resp->node_guid = (__force __u64) cm_id->device->node_guid;
853 resp->port_num = cm_id->port_num;
854 resp->pkey = (__force __u16) cpu_to_be16(
855 ib_addr_get_pkey(&cm_id->route.addr.dev_addr));
858 static ssize_t ucma_query_addr(struct ucma_context *ctx,
859 void __user *response, int out_len)
861 struct rdma_ucm_query_addr_resp resp;
862 struct sockaddr *addr;
865 if (out_len < sizeof(resp))
868 memset(&resp, 0, sizeof resp);
870 addr = (struct sockaddr *) &ctx->cm_id->route.addr.src_addr;
871 resp.src_size = rdma_addr_size(addr);
872 memcpy(&resp.src_addr, addr, resp.src_size);
874 addr = (struct sockaddr *) &ctx->cm_id->route.addr.dst_addr;
875 resp.dst_size = rdma_addr_size(addr);
876 memcpy(&resp.dst_addr, addr, resp.dst_size);
878 ucma_query_device_addr(ctx->cm_id, &resp);
880 if (copy_to_user(response, &resp, sizeof(resp)))
886 static ssize_t ucma_query_path(struct ucma_context *ctx,
887 void __user *response, int out_len)
889 struct rdma_ucm_query_path_resp *resp;
892 if (out_len < sizeof(*resp))
895 resp = kzalloc(out_len, GFP_KERNEL);
899 resp->num_paths = ctx->cm_id->route.num_paths;
900 for (i = 0, out_len -= sizeof(*resp);
901 i < resp->num_paths && out_len > sizeof(struct ib_path_rec_data);
902 i++, out_len -= sizeof(struct ib_path_rec_data)) {
903 struct sa_path_rec *rec = &ctx->cm_id->route.path_rec[i];
905 resp->path_data[i].flags = IB_PATH_GMP | IB_PATH_PRIMARY |
906 IB_PATH_BIDIRECTIONAL;
907 if (rec->rec_type == SA_PATH_REC_TYPE_IB) {
908 ib_sa_pack_path(rec, &resp->path_data[i].path_rec);
910 struct sa_path_rec ib;
912 sa_convert_path_opa_to_ib(&ib, rec);
913 ib_sa_pack_path(&ib, &resp->path_data[i].path_rec);
917 if (copy_to_user(response, resp,
918 sizeof(*resp) + (i * sizeof(struct ib_path_rec_data))))
925 static ssize_t ucma_query_gid(struct ucma_context *ctx,
926 void __user *response, int out_len)
928 struct rdma_ucm_query_addr_resp resp;
929 struct sockaddr_ib *addr;
932 if (out_len < sizeof(resp))
935 memset(&resp, 0, sizeof resp);
937 ucma_query_device_addr(ctx->cm_id, &resp);
939 addr = (struct sockaddr_ib *) &resp.src_addr;
940 resp.src_size = sizeof(*addr);
941 if (ctx->cm_id->route.addr.src_addr.ss_family == AF_IB) {
942 memcpy(addr, &ctx->cm_id->route.addr.src_addr, resp.src_size);
944 addr->sib_family = AF_IB;
945 addr->sib_pkey = (__force __be16) resp.pkey;
946 rdma_addr_get_sgid(&ctx->cm_id->route.addr.dev_addr,
947 (union ib_gid *) &addr->sib_addr);
948 addr->sib_sid = rdma_get_service_id(ctx->cm_id, (struct sockaddr *)
949 &ctx->cm_id->route.addr.src_addr);
952 addr = (struct sockaddr_ib *) &resp.dst_addr;
953 resp.dst_size = sizeof(*addr);
954 if (ctx->cm_id->route.addr.dst_addr.ss_family == AF_IB) {
955 memcpy(addr, &ctx->cm_id->route.addr.dst_addr, resp.dst_size);
957 addr->sib_family = AF_IB;
958 addr->sib_pkey = (__force __be16) resp.pkey;
959 rdma_addr_get_dgid(&ctx->cm_id->route.addr.dev_addr,
960 (union ib_gid *) &addr->sib_addr);
961 addr->sib_sid = rdma_get_service_id(ctx->cm_id, (struct sockaddr *)
962 &ctx->cm_id->route.addr.dst_addr);
965 if (copy_to_user(response, &resp, sizeof(resp)))
971 static ssize_t ucma_query(struct ucma_file *file,
972 const char __user *inbuf,
973 int in_len, int out_len)
975 struct rdma_ucm_query cmd;
976 struct ucma_context *ctx;
977 void __user *response;
980 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
983 response = (void __user *)(unsigned long) cmd.response;
984 ctx = ucma_get_ctx(file, cmd.id);
988 switch (cmd.option) {
989 case RDMA_USER_CM_QUERY_ADDR:
990 ret = ucma_query_addr(ctx, response, out_len);
992 case RDMA_USER_CM_QUERY_PATH:
993 ret = ucma_query_path(ctx, response, out_len);
995 case RDMA_USER_CM_QUERY_GID:
996 ret = ucma_query_gid(ctx, response, out_len);
1007 static void ucma_copy_conn_param(struct rdma_cm_id *id,
1008 struct rdma_conn_param *dst,
1009 struct rdma_ucm_conn_param *src)
1011 dst->private_data = src->private_data;
1012 dst->private_data_len = src->private_data_len;
1013 dst->responder_resources =src->responder_resources;
1014 dst->initiator_depth = src->initiator_depth;
1015 dst->flow_control = src->flow_control;
1016 dst->retry_count = src->retry_count;
1017 dst->rnr_retry_count = src->rnr_retry_count;
1018 dst->srq = src->srq;
1019 dst->qp_num = src->qp_num;
1020 dst->qkey = (id->route.addr.src_addr.ss_family == AF_IB) ? src->qkey : 0;
1023 static ssize_t ucma_connect(struct ucma_file *file, const char __user *inbuf,
1024 int in_len, int out_len)
1026 struct rdma_ucm_connect cmd;
1027 struct rdma_conn_param conn_param;
1028 struct ucma_context *ctx;
1031 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1034 if (!cmd.conn_param.valid)
1037 ctx = ucma_get_ctx(file, cmd.id);
1039 return PTR_ERR(ctx);
1041 ucma_copy_conn_param(ctx->cm_id, &conn_param, &cmd.conn_param);
1042 ret = rdma_connect(ctx->cm_id, &conn_param);
1047 static ssize_t ucma_listen(struct ucma_file *file, const char __user *inbuf,
1048 int in_len, int out_len)
1050 struct rdma_ucm_listen cmd;
1051 struct ucma_context *ctx;
1054 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1057 ctx = ucma_get_ctx(file, cmd.id);
1059 return PTR_ERR(ctx);
1061 ctx->backlog = cmd.backlog > 0 && cmd.backlog < max_backlog ?
1062 cmd.backlog : max_backlog;
1063 ret = rdma_listen(ctx->cm_id, ctx->backlog);
1068 static ssize_t ucma_accept(struct ucma_file *file, const char __user *inbuf,
1069 int in_len, int out_len)
1071 struct rdma_ucm_accept cmd;
1072 struct rdma_conn_param conn_param;
1073 struct ucma_context *ctx;
1076 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1079 ctx = ucma_get_ctx(file, cmd.id);
1081 return PTR_ERR(ctx);
1083 if (cmd.conn_param.valid) {
1084 ucma_copy_conn_param(ctx->cm_id, &conn_param, &cmd.conn_param);
1085 mutex_lock(&file->mut);
1086 ret = rdma_accept(ctx->cm_id, &conn_param);
1089 mutex_unlock(&file->mut);
1091 ret = rdma_accept(ctx->cm_id, NULL);
1097 static ssize_t ucma_reject(struct ucma_file *file, const char __user *inbuf,
1098 int in_len, int out_len)
1100 struct rdma_ucm_reject cmd;
1101 struct ucma_context *ctx;
1104 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1107 ctx = ucma_get_ctx(file, cmd.id);
1109 return PTR_ERR(ctx);
1111 ret = rdma_reject(ctx->cm_id, cmd.private_data, cmd.private_data_len);
1116 static ssize_t ucma_disconnect(struct ucma_file *file, const char __user *inbuf,
1117 int in_len, int out_len)
1119 struct rdma_ucm_disconnect cmd;
1120 struct ucma_context *ctx;
1123 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1126 ctx = ucma_get_ctx(file, cmd.id);
1128 return PTR_ERR(ctx);
1130 ret = rdma_disconnect(ctx->cm_id);
1135 static ssize_t ucma_init_qp_attr(struct ucma_file *file,
1136 const char __user *inbuf,
1137 int in_len, int out_len)
1139 struct rdma_ucm_init_qp_attr cmd;
1140 struct ib_uverbs_qp_attr resp;
1141 struct ucma_context *ctx;
1142 struct ib_qp_attr qp_attr;
1145 if (out_len < sizeof(resp))
1148 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1151 ctx = ucma_get_ctx(file, cmd.id);
1153 return PTR_ERR(ctx);
1155 resp.qp_attr_mask = 0;
1156 memset(&qp_attr, 0, sizeof qp_attr);
1157 qp_attr.qp_state = cmd.qp_state;
1158 ret = rdma_init_qp_attr(ctx->cm_id, &qp_attr, &resp.qp_attr_mask);
1162 ib_copy_qp_attr_to_user(ctx->cm_id->device, &resp, &qp_attr);
1163 if (copy_to_user((void __user *)(unsigned long)cmd.response,
1164 &resp, sizeof(resp)))
1172 static int ucma_set_option_id(struct ucma_context *ctx, int optname,
1173 void *optval, size_t optlen)
1178 case RDMA_OPTION_ID_TOS:
1179 if (optlen != sizeof(u8)) {
1183 rdma_set_service_type(ctx->cm_id, *((u8 *) optval));
1185 case RDMA_OPTION_ID_REUSEADDR:
1186 if (optlen != sizeof(int)) {
1190 ret = rdma_set_reuseaddr(ctx->cm_id, *((int *) optval) ? 1 : 0);
1192 case RDMA_OPTION_ID_AFONLY:
1193 if (optlen != sizeof(int)) {
1197 ret = rdma_set_afonly(ctx->cm_id, *((int *) optval) ? 1 : 0);
1206 static int ucma_set_ib_path(struct ucma_context *ctx,
1207 struct ib_path_rec_data *path_data, size_t optlen)
1209 struct sa_path_rec sa_path;
1210 struct rdma_cm_event event;
1213 if (optlen % sizeof(*path_data))
1216 for (; optlen; optlen -= sizeof(*path_data), path_data++) {
1217 if (path_data->flags == (IB_PATH_GMP | IB_PATH_PRIMARY |
1218 IB_PATH_BIDIRECTIONAL))
1225 memset(&sa_path, 0, sizeof(sa_path));
1227 sa_path.rec_type = SA_PATH_REC_TYPE_IB;
1228 ib_sa_unpack_path(path_data->path_rec, &sa_path);
1230 if (rdma_cap_opa_ah(ctx->cm_id->device, ctx->cm_id->port_num)) {
1231 struct sa_path_rec opa;
1233 sa_convert_path_ib_to_opa(&opa, &sa_path);
1234 ret = rdma_set_ib_paths(ctx->cm_id, &opa, 1);
1236 ret = rdma_set_ib_paths(ctx->cm_id, &sa_path, 1);
1241 memset(&event, 0, sizeof event);
1242 event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
1243 return ucma_event_handler(ctx->cm_id, &event);
1246 static int ucma_set_option_ib(struct ucma_context *ctx, int optname,
1247 void *optval, size_t optlen)
1252 case RDMA_OPTION_IB_PATH:
1253 ret = ucma_set_ib_path(ctx, optval, optlen);
1262 static int ucma_set_option_level(struct ucma_context *ctx, int level,
1263 int optname, void *optval, size_t optlen)
1268 case RDMA_OPTION_ID:
1269 ret = ucma_set_option_id(ctx, optname, optval, optlen);
1271 case RDMA_OPTION_IB:
1272 ret = ucma_set_option_ib(ctx, optname, optval, optlen);
1281 static ssize_t ucma_set_option(struct ucma_file *file, const char __user *inbuf,
1282 int in_len, int out_len)
1284 struct rdma_ucm_set_option cmd;
1285 struct ucma_context *ctx;
1289 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1292 ctx = ucma_get_ctx(file, cmd.id);
1294 return PTR_ERR(ctx);
1296 optval = memdup_user((void __user *) (unsigned long) cmd.optval,
1298 if (IS_ERR(optval)) {
1299 ret = PTR_ERR(optval);
1303 ret = ucma_set_option_level(ctx, cmd.level, cmd.optname, optval,
1312 static ssize_t ucma_notify(struct ucma_file *file, const char __user *inbuf,
1313 int in_len, int out_len)
1315 struct rdma_ucm_notify cmd;
1316 struct ucma_context *ctx;
1319 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1322 ctx = ucma_get_ctx(file, cmd.id);
1324 return PTR_ERR(ctx);
1326 ret = rdma_notify(ctx->cm_id, (enum ib_event_type) cmd.event);
1331 static ssize_t ucma_process_join(struct ucma_file *file,
1332 struct rdma_ucm_join_mcast *cmd, int out_len)
1334 struct rdma_ucm_create_id_resp resp;
1335 struct ucma_context *ctx;
1336 struct ucma_multicast *mc;
1337 struct sockaddr *addr;
1341 if (out_len < sizeof(resp))
1344 addr = (struct sockaddr *) &cmd->addr;
1345 if (!cmd->addr_size || (cmd->addr_size != rdma_addr_size(addr)))
1348 if (cmd->join_flags == RDMA_MC_JOIN_FLAG_FULLMEMBER)
1349 join_state = BIT(FULLMEMBER_JOIN);
1350 else if (cmd->join_flags == RDMA_MC_JOIN_FLAG_SENDONLY_FULLMEMBER)
1351 join_state = BIT(SENDONLY_FULLMEMBER_JOIN);
1355 ctx = ucma_get_ctx(file, cmd->id);
1357 return PTR_ERR(ctx);
1359 mutex_lock(&file->mut);
1360 mc = ucma_alloc_multicast(ctx);
1365 mc->join_state = join_state;
1367 memcpy(&mc->addr, addr, cmd->addr_size);
1368 ret = rdma_join_multicast(ctx->cm_id, (struct sockaddr *)&mc->addr,
1374 if (copy_to_user((void __user *)(unsigned long) cmd->response,
1375 &resp, sizeof(resp))) {
1380 mutex_unlock(&file->mut);
1385 rdma_leave_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr);
1386 ucma_cleanup_mc_events(mc);
1389 idr_remove(&multicast_idr, mc->id);
1391 list_del(&mc->list);
1394 mutex_unlock(&file->mut);
1399 static ssize_t ucma_join_ip_multicast(struct ucma_file *file,
1400 const char __user *inbuf,
1401 int in_len, int out_len)
1403 struct rdma_ucm_join_ip_mcast cmd;
1404 struct rdma_ucm_join_mcast join_cmd;
1406 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1409 join_cmd.response = cmd.response;
1410 join_cmd.uid = cmd.uid;
1411 join_cmd.id = cmd.id;
1412 join_cmd.addr_size = rdma_addr_size((struct sockaddr *) &cmd.addr);
1413 join_cmd.join_flags = RDMA_MC_JOIN_FLAG_FULLMEMBER;
1414 memcpy(&join_cmd.addr, &cmd.addr, join_cmd.addr_size);
1416 return ucma_process_join(file, &join_cmd, out_len);
1419 static ssize_t ucma_join_multicast(struct ucma_file *file,
1420 const char __user *inbuf,
1421 int in_len, int out_len)
1423 struct rdma_ucm_join_mcast cmd;
1425 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1428 return ucma_process_join(file, &cmd, out_len);
1431 static ssize_t ucma_leave_multicast(struct ucma_file *file,
1432 const char __user *inbuf,
1433 int in_len, int out_len)
1435 struct rdma_ucm_destroy_id cmd;
1436 struct rdma_ucm_destroy_id_resp resp;
1437 struct ucma_multicast *mc;
1440 if (out_len < sizeof(resp))
1443 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1447 mc = idr_find(&multicast_idr, cmd.id);
1449 mc = ERR_PTR(-ENOENT);
1450 else if (mc->ctx->file != file)
1451 mc = ERR_PTR(-EINVAL);
1452 else if (!atomic_inc_not_zero(&mc->ctx->ref))
1453 mc = ERR_PTR(-ENXIO);
1455 idr_remove(&multicast_idr, mc->id);
1463 rdma_leave_multicast(mc->ctx->cm_id, (struct sockaddr *) &mc->addr);
1464 mutex_lock(&mc->ctx->file->mut);
1465 ucma_cleanup_mc_events(mc);
1466 list_del(&mc->list);
1467 mutex_unlock(&mc->ctx->file->mut);
1469 ucma_put_ctx(mc->ctx);
1470 resp.events_reported = mc->events_reported;
1473 if (copy_to_user((void __user *)(unsigned long)cmd.response,
1474 &resp, sizeof(resp)))
1480 static void ucma_lock_files(struct ucma_file *file1, struct ucma_file *file2)
1482 /* Acquire mutex's based on pointer comparison to prevent deadlock. */
1483 if (file1 < file2) {
1484 mutex_lock(&file1->mut);
1485 mutex_lock_nested(&file2->mut, SINGLE_DEPTH_NESTING);
1487 mutex_lock(&file2->mut);
1488 mutex_lock_nested(&file1->mut, SINGLE_DEPTH_NESTING);
1492 static void ucma_unlock_files(struct ucma_file *file1, struct ucma_file *file2)
1494 if (file1 < file2) {
1495 mutex_unlock(&file2->mut);
1496 mutex_unlock(&file1->mut);
1498 mutex_unlock(&file1->mut);
1499 mutex_unlock(&file2->mut);
1503 static void ucma_move_events(struct ucma_context *ctx, struct ucma_file *file)
1505 struct ucma_event *uevent, *tmp;
1507 list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list)
1508 if (uevent->ctx == ctx)
1509 list_move_tail(&uevent->list, &file->event_list);
1512 static ssize_t ucma_migrate_id(struct ucma_file *new_file,
1513 const char __user *inbuf,
1514 int in_len, int out_len)
1516 struct rdma_ucm_migrate_id cmd;
1517 struct rdma_ucm_migrate_resp resp;
1518 struct ucma_context *ctx;
1520 struct ucma_file *cur_file;
1523 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1526 /* Get current fd to protect against it being closed */
1531 /* Validate current fd and prevent destruction of id. */
1532 ctx = ucma_get_ctx(f.file->private_data, cmd.id);
1538 cur_file = ctx->file;
1539 if (cur_file == new_file) {
1540 resp.events_reported = ctx->events_reported;
1545 * Migrate events between fd's, maintaining order, and avoiding new
1546 * events being added before existing events.
1548 ucma_lock_files(cur_file, new_file);
1551 list_move_tail(&ctx->list, &new_file->ctx_list);
1552 ucma_move_events(ctx, new_file);
1553 ctx->file = new_file;
1554 resp.events_reported = ctx->events_reported;
1557 ucma_unlock_files(cur_file, new_file);
1560 if (copy_to_user((void __user *)(unsigned long)cmd.response,
1561 &resp, sizeof(resp)))
1570 static ssize_t (*ucma_cmd_table[])(struct ucma_file *file,
1571 const char __user *inbuf,
1572 int in_len, int out_len) = {
1573 [RDMA_USER_CM_CMD_CREATE_ID] = ucma_create_id,
1574 [RDMA_USER_CM_CMD_DESTROY_ID] = ucma_destroy_id,
1575 [RDMA_USER_CM_CMD_BIND_IP] = ucma_bind_ip,
1576 [RDMA_USER_CM_CMD_RESOLVE_IP] = ucma_resolve_ip,
1577 [RDMA_USER_CM_CMD_RESOLVE_ROUTE] = ucma_resolve_route,
1578 [RDMA_USER_CM_CMD_QUERY_ROUTE] = ucma_query_route,
1579 [RDMA_USER_CM_CMD_CONNECT] = ucma_connect,
1580 [RDMA_USER_CM_CMD_LISTEN] = ucma_listen,
1581 [RDMA_USER_CM_CMD_ACCEPT] = ucma_accept,
1582 [RDMA_USER_CM_CMD_REJECT] = ucma_reject,
1583 [RDMA_USER_CM_CMD_DISCONNECT] = ucma_disconnect,
1584 [RDMA_USER_CM_CMD_INIT_QP_ATTR] = ucma_init_qp_attr,
1585 [RDMA_USER_CM_CMD_GET_EVENT] = ucma_get_event,
1586 [RDMA_USER_CM_CMD_GET_OPTION] = NULL,
1587 [RDMA_USER_CM_CMD_SET_OPTION] = ucma_set_option,
1588 [RDMA_USER_CM_CMD_NOTIFY] = ucma_notify,
1589 [RDMA_USER_CM_CMD_JOIN_IP_MCAST] = ucma_join_ip_multicast,
1590 [RDMA_USER_CM_CMD_LEAVE_MCAST] = ucma_leave_multicast,
1591 [RDMA_USER_CM_CMD_MIGRATE_ID] = ucma_migrate_id,
1592 [RDMA_USER_CM_CMD_QUERY] = ucma_query,
1593 [RDMA_USER_CM_CMD_BIND] = ucma_bind,
1594 [RDMA_USER_CM_CMD_RESOLVE_ADDR] = ucma_resolve_addr,
1595 [RDMA_USER_CM_CMD_JOIN_MCAST] = ucma_join_multicast
1598 static ssize_t ucma_write(struct file *filp, const char __user *buf,
1599 size_t len, loff_t *pos)
1601 struct ucma_file *file = filp->private_data;
1602 struct rdma_ucm_cmd_hdr hdr;
1605 if (!ib_safe_file_access(filp)) {
1606 pr_err_once("ucma_write: process %d (%s) changed security contexts after opening file descriptor, this is not allowed.\n",
1607 task_tgid_vnr(current), current->comm);
1611 if (len < sizeof(hdr))
1614 if (copy_from_user(&hdr, buf, sizeof(hdr)))
1617 if (hdr.cmd >= ARRAY_SIZE(ucma_cmd_table))
1620 if (hdr.in + sizeof(hdr) > len)
1623 if (!ucma_cmd_table[hdr.cmd])
1626 ret = ucma_cmd_table[hdr.cmd](file, buf + sizeof(hdr), hdr.in, hdr.out);
1633 static unsigned int ucma_poll(struct file *filp, struct poll_table_struct *wait)
1635 struct ucma_file *file = filp->private_data;
1636 unsigned int mask = 0;
1638 poll_wait(filp, &file->poll_wait, wait);
1640 if (!list_empty(&file->event_list))
1641 mask = POLLIN | POLLRDNORM;
1647 * ucma_open() does not need the BKL:
1649 * - no global state is referred to;
1650 * - there is no ioctl method to race against;
1651 * - no further module initialization is required for open to work
1652 * after the device is registered.
1654 static int ucma_open(struct inode *inode, struct file *filp)
1656 struct ucma_file *file;
1658 file = kmalloc(sizeof *file, GFP_KERNEL);
1662 file->close_wq = alloc_ordered_workqueue("ucma_close_id",
1664 if (!file->close_wq) {
1669 INIT_LIST_HEAD(&file->event_list);
1670 INIT_LIST_HEAD(&file->ctx_list);
1671 init_waitqueue_head(&file->poll_wait);
1672 mutex_init(&file->mut);
1674 filp->private_data = file;
1677 return nonseekable_open(inode, filp);
1680 static int ucma_close(struct inode *inode, struct file *filp)
1682 struct ucma_file *file = filp->private_data;
1683 struct ucma_context *ctx, *tmp;
1685 mutex_lock(&file->mut);
1686 list_for_each_entry_safe(ctx, tmp, &file->ctx_list, list) {
1687 ctx->destroying = 1;
1688 mutex_unlock(&file->mut);
1691 idr_remove(&ctx_idr, ctx->id);
1694 flush_workqueue(file->close_wq);
1695 /* At that step once ctx was marked as destroying and workqueue
1696 * was flushed we are safe from any inflights handlers that
1697 * might put other closing task.
1700 if (!ctx->closing) {
1702 /* rdma_destroy_id ensures that no event handlers are
1703 * inflight for that id before releasing it.
1705 rdma_destroy_id(ctx->cm_id);
1711 mutex_lock(&file->mut);
1713 mutex_unlock(&file->mut);
1714 destroy_workqueue(file->close_wq);
1719 static const struct file_operations ucma_fops = {
1720 .owner = THIS_MODULE,
1722 .release = ucma_close,
1723 .write = ucma_write,
1725 .llseek = no_llseek,
1728 static struct miscdevice ucma_misc = {
1729 .minor = MISC_DYNAMIC_MINOR,
1731 .nodename = "infiniband/rdma_cm",
1736 static ssize_t show_abi_version(struct device *dev,
1737 struct device_attribute *attr,
1740 return sprintf(buf, "%d\n", RDMA_USER_CM_ABI_VERSION);
1742 static DEVICE_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
1744 static int __init ucma_init(void)
1748 ret = misc_register(&ucma_misc);
1752 ret = device_create_file(ucma_misc.this_device, &dev_attr_abi_version);
1754 pr_err("rdma_ucm: couldn't create abi_version attr\n");
1758 ucma_ctl_table_hdr = register_net_sysctl(&init_net, "net/rdma_ucm", ucma_ctl_table);
1759 if (!ucma_ctl_table_hdr) {
1760 pr_err("rdma_ucm: couldn't register sysctl paths\n");
1766 device_remove_file(ucma_misc.this_device, &dev_attr_abi_version);
1768 misc_deregister(&ucma_misc);
1772 static void __exit ucma_cleanup(void)
1774 unregister_net_sysctl_table(ucma_ctl_table_hdr);
1775 device_remove_file(ucma_misc.this_device, &dev_attr_abi_version);
1776 misc_deregister(&ucma_misc);
1777 idr_destroy(&ctx_idr);
1778 idr_destroy(&multicast_idr);
1781 module_init(ucma_init);
1782 module_exit(ucma_cleanup);