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>
50 #include <rdma/ib_addr.h>
53 MODULE_AUTHOR("Sean Hefty");
54 MODULE_DESCRIPTION("RDMA Userspace Connection Manager Access");
55 MODULE_LICENSE("Dual BSD/GPL");
57 static unsigned int max_backlog = 1024;
59 static struct ctl_table_header *ucma_ctl_table_hdr;
60 static struct ctl_table ucma_ctl_table[] = {
62 .procname = "max_backlog",
64 .maxlen = sizeof max_backlog,
66 .proc_handler = proc_dointvec,
74 struct list_head ctx_list;
75 struct list_head event_list;
76 wait_queue_head_t poll_wait;
81 struct completion comp;
86 struct ucma_file *file;
87 struct rdma_cm_id *cm_id;
90 struct list_head list;
91 struct list_head mc_list;
94 struct ucma_multicast {
95 struct ucma_context *ctx;
100 struct list_head list;
101 struct sockaddr_storage addr;
105 struct ucma_context *ctx;
106 struct ucma_multicast *mc;
107 struct list_head list;
108 struct rdma_cm_id *cm_id;
109 struct rdma_ucm_event_resp resp;
112 static DEFINE_MUTEX(mut);
113 static DEFINE_IDR(ctx_idr);
114 static DEFINE_IDR(multicast_idr);
116 static inline struct ucma_context *_ucma_find_context(int id,
117 struct ucma_file *file)
119 struct ucma_context *ctx;
121 ctx = idr_find(&ctx_idr, id);
123 ctx = ERR_PTR(-ENOENT);
124 else if (ctx->file != file)
125 ctx = ERR_PTR(-EINVAL);
129 static struct ucma_context *ucma_get_ctx(struct ucma_file *file, int id)
131 struct ucma_context *ctx;
134 ctx = _ucma_find_context(id, file);
136 atomic_inc(&ctx->ref);
141 static void ucma_put_ctx(struct ucma_context *ctx)
143 if (atomic_dec_and_test(&ctx->ref))
144 complete(&ctx->comp);
147 static struct ucma_context *ucma_alloc_ctx(struct ucma_file *file)
149 struct ucma_context *ctx;
151 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
155 atomic_set(&ctx->ref, 1);
156 init_completion(&ctx->comp);
157 INIT_LIST_HEAD(&ctx->mc_list);
161 ctx->id = idr_alloc(&ctx_idr, ctx, 0, 0, GFP_KERNEL);
166 list_add_tail(&ctx->list, &file->ctx_list);
174 static struct ucma_multicast* ucma_alloc_multicast(struct ucma_context *ctx)
176 struct ucma_multicast *mc;
178 mc = kzalloc(sizeof(*mc), GFP_KERNEL);
183 mc->id = idr_alloc(&multicast_idr, mc, 0, 0, GFP_KERNEL);
189 list_add_tail(&mc->list, &ctx->mc_list);
197 static void ucma_copy_conn_event(struct rdma_ucm_conn_param *dst,
198 struct rdma_conn_param *src)
200 if (src->private_data_len)
201 memcpy(dst->private_data, src->private_data,
202 src->private_data_len);
203 dst->private_data_len = src->private_data_len;
204 dst->responder_resources =src->responder_resources;
205 dst->initiator_depth = src->initiator_depth;
206 dst->flow_control = src->flow_control;
207 dst->retry_count = src->retry_count;
208 dst->rnr_retry_count = src->rnr_retry_count;
210 dst->qp_num = src->qp_num;
213 static void ucma_copy_ud_event(struct rdma_ucm_ud_param *dst,
214 struct rdma_ud_param *src)
216 if (src->private_data_len)
217 memcpy(dst->private_data, src->private_data,
218 src->private_data_len);
219 dst->private_data_len = src->private_data_len;
220 ib_copy_ah_attr_to_user(&dst->ah_attr, &src->ah_attr);
221 dst->qp_num = src->qp_num;
222 dst->qkey = src->qkey;
225 static void ucma_set_event_context(struct ucma_context *ctx,
226 struct rdma_cm_event *event,
227 struct ucma_event *uevent)
230 switch (event->event) {
231 case RDMA_CM_EVENT_MULTICAST_JOIN:
232 case RDMA_CM_EVENT_MULTICAST_ERROR:
233 uevent->mc = (struct ucma_multicast *)
234 event->param.ud.private_data;
235 uevent->resp.uid = uevent->mc->uid;
236 uevent->resp.id = uevent->mc->id;
239 uevent->resp.uid = ctx->uid;
240 uevent->resp.id = ctx->id;
245 static int ucma_event_handler(struct rdma_cm_id *cm_id,
246 struct rdma_cm_event *event)
248 struct ucma_event *uevent;
249 struct ucma_context *ctx = cm_id->context;
252 uevent = kzalloc(sizeof(*uevent), GFP_KERNEL);
254 return event->event == RDMA_CM_EVENT_CONNECT_REQUEST;
256 mutex_lock(&ctx->file->mut);
257 uevent->cm_id = cm_id;
258 ucma_set_event_context(ctx, event, uevent);
259 uevent->resp.event = event->event;
260 uevent->resp.status = event->status;
261 if (cm_id->qp_type == IB_QPT_UD)
262 ucma_copy_ud_event(&uevent->resp.param.ud, &event->param.ud);
264 ucma_copy_conn_event(&uevent->resp.param.conn,
267 if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST) {
274 } else if (!ctx->uid || ctx->cm_id != cm_id) {
276 * We ignore events for new connections until userspace has set
277 * their context. This can only happen if an error occurs on a
278 * new connection before the user accepts it. This is okay,
279 * since the accept will just fail later.
285 list_add_tail(&uevent->list, &ctx->file->event_list);
286 wake_up_interruptible(&ctx->file->poll_wait);
288 mutex_unlock(&ctx->file->mut);
292 static ssize_t ucma_get_event(struct ucma_file *file, const char __user *inbuf,
293 int in_len, int out_len)
295 struct ucma_context *ctx;
296 struct rdma_ucm_get_event cmd;
297 struct ucma_event *uevent;
300 if (out_len < sizeof uevent->resp)
303 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
306 mutex_lock(&file->mut);
307 while (list_empty(&file->event_list)) {
308 mutex_unlock(&file->mut);
310 if (file->filp->f_flags & O_NONBLOCK)
313 if (wait_event_interruptible(file->poll_wait,
314 !list_empty(&file->event_list)))
317 mutex_lock(&file->mut);
320 uevent = list_entry(file->event_list.next, struct ucma_event, list);
322 if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST) {
323 ctx = ucma_alloc_ctx(file);
328 uevent->ctx->backlog++;
329 ctx->cm_id = uevent->cm_id;
330 ctx->cm_id->context = ctx;
331 uevent->resp.id = ctx->id;
334 if (copy_to_user((void __user *)(unsigned long)cmd.response,
335 &uevent->resp, sizeof uevent->resp)) {
340 list_del(&uevent->list);
341 uevent->ctx->events_reported++;
343 uevent->mc->events_reported++;
346 mutex_unlock(&file->mut);
350 static int ucma_get_qp_type(struct rdma_ucm_create_id *cmd, enum ib_qp_type *qp_type)
354 *qp_type = IB_QPT_RC;
358 *qp_type = IB_QPT_UD;
361 *qp_type = cmd->qp_type;
368 static ssize_t ucma_create_id(struct ucma_file *file, const char __user *inbuf,
369 int in_len, int out_len)
371 struct rdma_ucm_create_id cmd;
372 struct rdma_ucm_create_id_resp resp;
373 struct ucma_context *ctx;
374 enum ib_qp_type qp_type;
377 if (out_len < sizeof(resp))
380 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
383 ret = ucma_get_qp_type(&cmd, &qp_type);
387 mutex_lock(&file->mut);
388 ctx = ucma_alloc_ctx(file);
389 mutex_unlock(&file->mut);
394 ctx->cm_id = rdma_create_id(ucma_event_handler, ctx, cmd.ps, qp_type);
395 if (IS_ERR(ctx->cm_id)) {
396 ret = PTR_ERR(ctx->cm_id);
401 if (copy_to_user((void __user *)(unsigned long)cmd.response,
402 &resp, sizeof(resp))) {
409 rdma_destroy_id(ctx->cm_id);
412 idr_remove(&ctx_idr, ctx->id);
418 static void ucma_cleanup_multicast(struct ucma_context *ctx)
420 struct ucma_multicast *mc, *tmp;
423 list_for_each_entry_safe(mc, tmp, &ctx->mc_list, list) {
425 idr_remove(&multicast_idr, mc->id);
431 static void ucma_cleanup_mc_events(struct ucma_multicast *mc)
433 struct ucma_event *uevent, *tmp;
435 list_for_each_entry_safe(uevent, tmp, &mc->ctx->file->event_list, list) {
436 if (uevent->mc != mc)
439 list_del(&uevent->list);
445 * We cannot hold file->mut when calling rdma_destroy_id() or we can
446 * deadlock. We also acquire file->mut in ucma_event_handler(), and
447 * rdma_destroy_id() will wait until all callbacks have completed.
449 static int ucma_free_ctx(struct ucma_context *ctx)
452 struct ucma_event *uevent, *tmp;
455 /* No new events will be generated after destroying the id. */
456 rdma_destroy_id(ctx->cm_id);
458 ucma_cleanup_multicast(ctx);
460 /* Cleanup events not yet reported to the user. */
461 mutex_lock(&ctx->file->mut);
462 list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list) {
463 if (uevent->ctx == ctx)
464 list_move_tail(&uevent->list, &list);
466 list_del(&ctx->list);
467 mutex_unlock(&ctx->file->mut);
469 list_for_each_entry_safe(uevent, tmp, &list, list) {
470 list_del(&uevent->list);
471 if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST)
472 rdma_destroy_id(uevent->cm_id);
476 events_reported = ctx->events_reported;
478 return events_reported;
481 static ssize_t ucma_destroy_id(struct ucma_file *file, const char __user *inbuf,
482 int in_len, int out_len)
484 struct rdma_ucm_destroy_id cmd;
485 struct rdma_ucm_destroy_id_resp resp;
486 struct ucma_context *ctx;
489 if (out_len < sizeof(resp))
492 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
496 ctx = _ucma_find_context(cmd.id, file);
498 idr_remove(&ctx_idr, ctx->id);
505 wait_for_completion(&ctx->comp);
506 resp.events_reported = ucma_free_ctx(ctx);
508 if (copy_to_user((void __user *)(unsigned long)cmd.response,
509 &resp, sizeof(resp)))
515 static ssize_t ucma_bind_ip(struct ucma_file *file, const char __user *inbuf,
516 int in_len, int out_len)
518 struct rdma_ucm_bind_ip cmd;
519 struct ucma_context *ctx;
522 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
525 ctx = ucma_get_ctx(file, cmd.id);
529 ret = rdma_bind_addr(ctx->cm_id, (struct sockaddr *) &cmd.addr);
534 static ssize_t ucma_bind(struct ucma_file *file, const char __user *inbuf,
535 int in_len, int out_len)
537 struct rdma_ucm_bind cmd;
538 struct sockaddr *addr;
539 struct ucma_context *ctx;
542 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
545 addr = (struct sockaddr *) &cmd.addr;
546 if (cmd.reserved || !cmd.addr_size || (cmd.addr_size != rdma_addr_size(addr)))
549 ctx = ucma_get_ctx(file, cmd.id);
553 ret = rdma_bind_addr(ctx->cm_id, addr);
558 static ssize_t ucma_resolve_ip(struct ucma_file *file,
559 const char __user *inbuf,
560 int in_len, int out_len)
562 struct rdma_ucm_resolve_ip cmd;
563 struct ucma_context *ctx;
566 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
569 ctx = ucma_get_ctx(file, cmd.id);
573 ret = rdma_resolve_addr(ctx->cm_id, (struct sockaddr *) &cmd.src_addr,
574 (struct sockaddr *) &cmd.dst_addr,
580 static ssize_t ucma_resolve_addr(struct ucma_file *file,
581 const char __user *inbuf,
582 int in_len, int out_len)
584 struct rdma_ucm_resolve_addr cmd;
585 struct sockaddr *src, *dst;
586 struct ucma_context *ctx;
589 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
592 src = (struct sockaddr *) &cmd.src_addr;
593 dst = (struct sockaddr *) &cmd.dst_addr;
594 if (cmd.reserved || (cmd.src_size && (cmd.src_size != rdma_addr_size(src))) ||
595 !cmd.dst_size || (cmd.dst_size != rdma_addr_size(dst)))
598 ctx = ucma_get_ctx(file, cmd.id);
602 ret = rdma_resolve_addr(ctx->cm_id, src, dst, cmd.timeout_ms);
607 static ssize_t ucma_resolve_route(struct ucma_file *file,
608 const char __user *inbuf,
609 int in_len, int out_len)
611 struct rdma_ucm_resolve_route cmd;
612 struct ucma_context *ctx;
615 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
618 ctx = ucma_get_ctx(file, cmd.id);
622 ret = rdma_resolve_route(ctx->cm_id, cmd.timeout_ms);
627 static void ucma_copy_ib_route(struct rdma_ucm_query_route_resp *resp,
628 struct rdma_route *route)
630 struct rdma_dev_addr *dev_addr;
632 resp->num_paths = route->num_paths;
633 switch (route->num_paths) {
635 dev_addr = &route->addr.dev_addr;
636 rdma_addr_get_dgid(dev_addr,
637 (union ib_gid *) &resp->ib_route[0].dgid);
638 rdma_addr_get_sgid(dev_addr,
639 (union ib_gid *) &resp->ib_route[0].sgid);
640 resp->ib_route[0].pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
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_iboe_route(struct rdma_ucm_query_route_resp *resp,
656 struct rdma_route *route)
659 resp->num_paths = route->num_paths;
660 switch (route->num_paths) {
662 rdma_ip2gid((struct sockaddr *)&route->addr.dst_addr,
663 (union ib_gid *)&resp->ib_route[0].dgid);
664 rdma_ip2gid((struct sockaddr *)&route->addr.src_addr,
665 (union ib_gid *)&resp->ib_route[0].sgid);
666 resp->ib_route[0].pkey = cpu_to_be16(0xffff);
669 ib_copy_path_rec_to_user(&resp->ib_route[1],
670 &route->path_rec[1]);
673 ib_copy_path_rec_to_user(&resp->ib_route[0],
674 &route->path_rec[0]);
681 static void ucma_copy_iw_route(struct rdma_ucm_query_route_resp *resp,
682 struct rdma_route *route)
684 struct rdma_dev_addr *dev_addr;
686 dev_addr = &route->addr.dev_addr;
687 rdma_addr_get_dgid(dev_addr, (union ib_gid *) &resp->ib_route[0].dgid);
688 rdma_addr_get_sgid(dev_addr, (union ib_gid *) &resp->ib_route[0].sgid);
691 static ssize_t ucma_query_route(struct ucma_file *file,
692 const char __user *inbuf,
693 int in_len, int out_len)
695 struct rdma_ucm_query cmd;
696 struct rdma_ucm_query_route_resp resp;
697 struct ucma_context *ctx;
698 struct sockaddr *addr;
701 if (out_len < sizeof(resp))
704 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
707 ctx = ucma_get_ctx(file, cmd.id);
711 memset(&resp, 0, sizeof resp);
712 addr = (struct sockaddr *) &ctx->cm_id->route.addr.src_addr;
713 memcpy(&resp.src_addr, addr, addr->sa_family == AF_INET ?
714 sizeof(struct sockaddr_in) :
715 sizeof(struct sockaddr_in6));
716 addr = (struct sockaddr *) &ctx->cm_id->route.addr.dst_addr;
717 memcpy(&resp.dst_addr, addr, addr->sa_family == AF_INET ?
718 sizeof(struct sockaddr_in) :
719 sizeof(struct sockaddr_in6));
720 if (!ctx->cm_id->device)
723 resp.node_guid = (__force __u64) ctx->cm_id->device->node_guid;
724 resp.port_num = ctx->cm_id->port_num;
726 if (rdma_cap_ib_sa(ctx->cm_id->device, ctx->cm_id->port_num))
727 ucma_copy_ib_route(&resp, &ctx->cm_id->route);
728 else if (rdma_protocol_roce(ctx->cm_id->device, ctx->cm_id->port_num))
729 ucma_copy_iboe_route(&resp, &ctx->cm_id->route);
730 else if (rdma_protocol_iwarp(ctx->cm_id->device, ctx->cm_id->port_num))
731 ucma_copy_iw_route(&resp, &ctx->cm_id->route);
734 if (copy_to_user((void __user *)(unsigned long)cmd.response,
735 &resp, sizeof(resp)))
742 static void ucma_query_device_addr(struct rdma_cm_id *cm_id,
743 struct rdma_ucm_query_addr_resp *resp)
748 resp->node_guid = (__force __u64) cm_id->device->node_guid;
749 resp->port_num = cm_id->port_num;
750 resp->pkey = (__force __u16) cpu_to_be16(
751 ib_addr_get_pkey(&cm_id->route.addr.dev_addr));
754 static ssize_t ucma_query_addr(struct ucma_context *ctx,
755 void __user *response, int out_len)
757 struct rdma_ucm_query_addr_resp resp;
758 struct sockaddr *addr;
761 if (out_len < sizeof(resp))
764 memset(&resp, 0, sizeof resp);
766 addr = (struct sockaddr *) &ctx->cm_id->route.addr.src_addr;
767 resp.src_size = rdma_addr_size(addr);
768 memcpy(&resp.src_addr, addr, resp.src_size);
770 addr = (struct sockaddr *) &ctx->cm_id->route.addr.dst_addr;
771 resp.dst_size = rdma_addr_size(addr);
772 memcpy(&resp.dst_addr, addr, resp.dst_size);
774 ucma_query_device_addr(ctx->cm_id, &resp);
776 if (copy_to_user(response, &resp, sizeof(resp)))
782 static ssize_t ucma_query_path(struct ucma_context *ctx,
783 void __user *response, int out_len)
785 struct rdma_ucm_query_path_resp *resp;
788 if (out_len < sizeof(*resp))
791 resp = kzalloc(out_len, GFP_KERNEL);
795 resp->num_paths = ctx->cm_id->route.num_paths;
796 for (i = 0, out_len -= sizeof(*resp);
797 i < resp->num_paths && out_len > sizeof(struct ib_path_rec_data);
798 i++, out_len -= sizeof(struct ib_path_rec_data)) {
800 resp->path_data[i].flags = IB_PATH_GMP | IB_PATH_PRIMARY |
801 IB_PATH_BIDIRECTIONAL;
802 ib_sa_pack_path(&ctx->cm_id->route.path_rec[i],
803 &resp->path_data[i].path_rec);
806 if (copy_to_user(response, resp,
807 sizeof(*resp) + (i * sizeof(struct ib_path_rec_data))))
814 static ssize_t ucma_query_gid(struct ucma_context *ctx,
815 void __user *response, int out_len)
817 struct rdma_ucm_query_addr_resp resp;
818 struct sockaddr_ib *addr;
821 if (out_len < sizeof(resp))
824 memset(&resp, 0, sizeof resp);
826 ucma_query_device_addr(ctx->cm_id, &resp);
828 addr = (struct sockaddr_ib *) &resp.src_addr;
829 resp.src_size = sizeof(*addr);
830 if (ctx->cm_id->route.addr.src_addr.ss_family == AF_IB) {
831 memcpy(addr, &ctx->cm_id->route.addr.src_addr, resp.src_size);
833 addr->sib_family = AF_IB;
834 addr->sib_pkey = (__force __be16) resp.pkey;
835 rdma_addr_get_sgid(&ctx->cm_id->route.addr.dev_addr,
836 (union ib_gid *) &addr->sib_addr);
837 addr->sib_sid = rdma_get_service_id(ctx->cm_id, (struct sockaddr *)
838 &ctx->cm_id->route.addr.src_addr);
841 addr = (struct sockaddr_ib *) &resp.dst_addr;
842 resp.dst_size = sizeof(*addr);
843 if (ctx->cm_id->route.addr.dst_addr.ss_family == AF_IB) {
844 memcpy(addr, &ctx->cm_id->route.addr.dst_addr, resp.dst_size);
846 addr->sib_family = AF_IB;
847 addr->sib_pkey = (__force __be16) resp.pkey;
848 rdma_addr_get_dgid(&ctx->cm_id->route.addr.dev_addr,
849 (union ib_gid *) &addr->sib_addr);
850 addr->sib_sid = rdma_get_service_id(ctx->cm_id, (struct sockaddr *)
851 &ctx->cm_id->route.addr.dst_addr);
854 if (copy_to_user(response, &resp, sizeof(resp)))
860 static ssize_t ucma_query(struct ucma_file *file,
861 const char __user *inbuf,
862 int in_len, int out_len)
864 struct rdma_ucm_query cmd;
865 struct ucma_context *ctx;
866 void __user *response;
869 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
872 response = (void __user *)(unsigned long) cmd.response;
873 ctx = ucma_get_ctx(file, cmd.id);
877 switch (cmd.option) {
878 case RDMA_USER_CM_QUERY_ADDR:
879 ret = ucma_query_addr(ctx, response, out_len);
881 case RDMA_USER_CM_QUERY_PATH:
882 ret = ucma_query_path(ctx, response, out_len);
884 case RDMA_USER_CM_QUERY_GID:
885 ret = ucma_query_gid(ctx, response, out_len);
896 static void ucma_copy_conn_param(struct rdma_cm_id *id,
897 struct rdma_conn_param *dst,
898 struct rdma_ucm_conn_param *src)
900 dst->private_data = src->private_data;
901 dst->private_data_len = src->private_data_len;
902 dst->responder_resources =src->responder_resources;
903 dst->initiator_depth = src->initiator_depth;
904 dst->flow_control = src->flow_control;
905 dst->retry_count = src->retry_count;
906 dst->rnr_retry_count = src->rnr_retry_count;
908 dst->qp_num = src->qp_num;
909 dst->qkey = (id->route.addr.src_addr.ss_family == AF_IB) ? src->qkey : 0;
912 static ssize_t ucma_connect(struct ucma_file *file, const char __user *inbuf,
913 int in_len, int out_len)
915 struct rdma_ucm_connect cmd;
916 struct rdma_conn_param conn_param;
917 struct ucma_context *ctx;
920 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
923 if (!cmd.conn_param.valid)
926 ctx = ucma_get_ctx(file, cmd.id);
930 ucma_copy_conn_param(ctx->cm_id, &conn_param, &cmd.conn_param);
931 ret = rdma_connect(ctx->cm_id, &conn_param);
936 static ssize_t ucma_listen(struct ucma_file *file, const char __user *inbuf,
937 int in_len, int out_len)
939 struct rdma_ucm_listen cmd;
940 struct ucma_context *ctx;
943 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
946 ctx = ucma_get_ctx(file, cmd.id);
950 ctx->backlog = cmd.backlog > 0 && cmd.backlog < max_backlog ?
951 cmd.backlog : max_backlog;
952 ret = rdma_listen(ctx->cm_id, ctx->backlog);
957 static ssize_t ucma_accept(struct ucma_file *file, const char __user *inbuf,
958 int in_len, int out_len)
960 struct rdma_ucm_accept cmd;
961 struct rdma_conn_param conn_param;
962 struct ucma_context *ctx;
965 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
968 ctx = ucma_get_ctx(file, cmd.id);
972 if (cmd.conn_param.valid) {
973 ucma_copy_conn_param(ctx->cm_id, &conn_param, &cmd.conn_param);
974 mutex_lock(&file->mut);
975 ret = rdma_accept(ctx->cm_id, &conn_param);
978 mutex_unlock(&file->mut);
980 ret = rdma_accept(ctx->cm_id, NULL);
986 static ssize_t ucma_reject(struct ucma_file *file, const char __user *inbuf,
987 int in_len, int out_len)
989 struct rdma_ucm_reject cmd;
990 struct ucma_context *ctx;
993 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
996 ctx = ucma_get_ctx(file, cmd.id);
1000 ret = rdma_reject(ctx->cm_id, cmd.private_data, cmd.private_data_len);
1005 static ssize_t ucma_disconnect(struct ucma_file *file, const char __user *inbuf,
1006 int in_len, int out_len)
1008 struct rdma_ucm_disconnect cmd;
1009 struct ucma_context *ctx;
1012 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1015 ctx = ucma_get_ctx(file, cmd.id);
1017 return PTR_ERR(ctx);
1019 ret = rdma_disconnect(ctx->cm_id);
1024 static ssize_t ucma_init_qp_attr(struct ucma_file *file,
1025 const char __user *inbuf,
1026 int in_len, int out_len)
1028 struct rdma_ucm_init_qp_attr cmd;
1029 struct ib_uverbs_qp_attr resp;
1030 struct ucma_context *ctx;
1031 struct ib_qp_attr qp_attr;
1034 if (out_len < sizeof(resp))
1037 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1040 ctx = ucma_get_ctx(file, cmd.id);
1042 return PTR_ERR(ctx);
1044 resp.qp_attr_mask = 0;
1045 memset(&qp_attr, 0, sizeof qp_attr);
1046 qp_attr.qp_state = cmd.qp_state;
1047 ret = rdma_init_qp_attr(ctx->cm_id, &qp_attr, &resp.qp_attr_mask);
1051 ib_copy_qp_attr_to_user(&resp, &qp_attr);
1052 if (copy_to_user((void __user *)(unsigned long)cmd.response,
1053 &resp, sizeof(resp)))
1061 static int ucma_set_option_id(struct ucma_context *ctx, int optname,
1062 void *optval, size_t optlen)
1067 case RDMA_OPTION_ID_TOS:
1068 if (optlen != sizeof(u8)) {
1072 rdma_set_service_type(ctx->cm_id, *((u8 *) optval));
1074 case RDMA_OPTION_ID_REUSEADDR:
1075 if (optlen != sizeof(int)) {
1079 ret = rdma_set_reuseaddr(ctx->cm_id, *((int *) optval) ? 1 : 0);
1081 case RDMA_OPTION_ID_AFONLY:
1082 if (optlen != sizeof(int)) {
1086 ret = rdma_set_afonly(ctx->cm_id, *((int *) optval) ? 1 : 0);
1095 static int ucma_set_ib_path(struct ucma_context *ctx,
1096 struct ib_path_rec_data *path_data, size_t optlen)
1098 struct ib_sa_path_rec sa_path;
1099 struct rdma_cm_event event;
1102 if (optlen % sizeof(*path_data))
1105 for (; optlen; optlen -= sizeof(*path_data), path_data++) {
1106 if (path_data->flags == (IB_PATH_GMP | IB_PATH_PRIMARY |
1107 IB_PATH_BIDIRECTIONAL))
1114 memset(&sa_path, 0, sizeof(sa_path));
1115 sa_path.vlan_id = 0xffff;
1117 ib_sa_unpack_path(path_data->path_rec, &sa_path);
1118 ret = rdma_set_ib_paths(ctx->cm_id, &sa_path, 1);
1122 memset(&event, 0, sizeof event);
1123 event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
1124 return ucma_event_handler(ctx->cm_id, &event);
1127 static int ucma_set_option_ib(struct ucma_context *ctx, int optname,
1128 void *optval, size_t optlen)
1133 case RDMA_OPTION_IB_PATH:
1134 ret = ucma_set_ib_path(ctx, optval, optlen);
1143 static int ucma_set_option_level(struct ucma_context *ctx, int level,
1144 int optname, void *optval, size_t optlen)
1149 case RDMA_OPTION_ID:
1150 ret = ucma_set_option_id(ctx, optname, optval, optlen);
1152 case RDMA_OPTION_IB:
1153 ret = ucma_set_option_ib(ctx, optname, optval, optlen);
1162 static ssize_t ucma_set_option(struct ucma_file *file, const char __user *inbuf,
1163 int in_len, int out_len)
1165 struct rdma_ucm_set_option cmd;
1166 struct ucma_context *ctx;
1170 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1173 ctx = ucma_get_ctx(file, cmd.id);
1175 return PTR_ERR(ctx);
1177 optval = memdup_user((void __user *) (unsigned long) cmd.optval,
1179 if (IS_ERR(optval)) {
1180 ret = PTR_ERR(optval);
1184 ret = ucma_set_option_level(ctx, cmd.level, cmd.optname, optval,
1193 static ssize_t ucma_notify(struct ucma_file *file, const char __user *inbuf,
1194 int in_len, int out_len)
1196 struct rdma_ucm_notify cmd;
1197 struct ucma_context *ctx;
1200 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1203 ctx = ucma_get_ctx(file, cmd.id);
1205 return PTR_ERR(ctx);
1207 ret = rdma_notify(ctx->cm_id, (enum ib_event_type) cmd.event);
1212 static ssize_t ucma_process_join(struct ucma_file *file,
1213 struct rdma_ucm_join_mcast *cmd, int out_len)
1215 struct rdma_ucm_create_id_resp resp;
1216 struct ucma_context *ctx;
1217 struct ucma_multicast *mc;
1218 struct sockaddr *addr;
1221 if (out_len < sizeof(resp))
1224 addr = (struct sockaddr *) &cmd->addr;
1225 if (cmd->reserved || !cmd->addr_size || (cmd->addr_size != rdma_addr_size(addr)))
1228 ctx = ucma_get_ctx(file, cmd->id);
1230 return PTR_ERR(ctx);
1232 mutex_lock(&file->mut);
1233 mc = ucma_alloc_multicast(ctx);
1240 memcpy(&mc->addr, addr, cmd->addr_size);
1241 ret = rdma_join_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr, mc);
1246 if (copy_to_user((void __user *)(unsigned long) cmd->response,
1247 &resp, sizeof(resp))) {
1252 mutex_unlock(&file->mut);
1257 rdma_leave_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr);
1258 ucma_cleanup_mc_events(mc);
1261 idr_remove(&multicast_idr, mc->id);
1263 list_del(&mc->list);
1266 mutex_unlock(&file->mut);
1271 static ssize_t ucma_join_ip_multicast(struct ucma_file *file,
1272 const char __user *inbuf,
1273 int in_len, int out_len)
1275 struct rdma_ucm_join_ip_mcast cmd;
1276 struct rdma_ucm_join_mcast join_cmd;
1278 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1281 join_cmd.response = cmd.response;
1282 join_cmd.uid = cmd.uid;
1283 join_cmd.id = cmd.id;
1284 join_cmd.addr_size = rdma_addr_size((struct sockaddr *) &cmd.addr);
1285 join_cmd.reserved = 0;
1286 memcpy(&join_cmd.addr, &cmd.addr, join_cmd.addr_size);
1288 return ucma_process_join(file, &join_cmd, out_len);
1291 static ssize_t ucma_join_multicast(struct ucma_file *file,
1292 const char __user *inbuf,
1293 int in_len, int out_len)
1295 struct rdma_ucm_join_mcast cmd;
1297 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1300 return ucma_process_join(file, &cmd, out_len);
1303 static ssize_t ucma_leave_multicast(struct ucma_file *file,
1304 const char __user *inbuf,
1305 int in_len, int out_len)
1307 struct rdma_ucm_destroy_id cmd;
1308 struct rdma_ucm_destroy_id_resp resp;
1309 struct ucma_multicast *mc;
1312 if (out_len < sizeof(resp))
1315 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1319 mc = idr_find(&multicast_idr, cmd.id);
1321 mc = ERR_PTR(-ENOENT);
1322 else if (mc->ctx->file != file)
1323 mc = ERR_PTR(-EINVAL);
1325 idr_remove(&multicast_idr, mc->id);
1326 atomic_inc(&mc->ctx->ref);
1335 rdma_leave_multicast(mc->ctx->cm_id, (struct sockaddr *) &mc->addr);
1336 mutex_lock(&mc->ctx->file->mut);
1337 ucma_cleanup_mc_events(mc);
1338 list_del(&mc->list);
1339 mutex_unlock(&mc->ctx->file->mut);
1341 ucma_put_ctx(mc->ctx);
1342 resp.events_reported = mc->events_reported;
1345 if (copy_to_user((void __user *)(unsigned long)cmd.response,
1346 &resp, sizeof(resp)))
1352 static void ucma_lock_files(struct ucma_file *file1, struct ucma_file *file2)
1354 /* Acquire mutex's based on pointer comparison to prevent deadlock. */
1355 if (file1 < file2) {
1356 mutex_lock(&file1->mut);
1357 mutex_lock_nested(&file2->mut, SINGLE_DEPTH_NESTING);
1359 mutex_lock(&file2->mut);
1360 mutex_lock_nested(&file1->mut, SINGLE_DEPTH_NESTING);
1364 static void ucma_unlock_files(struct ucma_file *file1, struct ucma_file *file2)
1366 if (file1 < file2) {
1367 mutex_unlock(&file2->mut);
1368 mutex_unlock(&file1->mut);
1370 mutex_unlock(&file1->mut);
1371 mutex_unlock(&file2->mut);
1375 static void ucma_move_events(struct ucma_context *ctx, struct ucma_file *file)
1377 struct ucma_event *uevent, *tmp;
1379 list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list)
1380 if (uevent->ctx == ctx)
1381 list_move_tail(&uevent->list, &file->event_list);
1384 static ssize_t ucma_migrate_id(struct ucma_file *new_file,
1385 const char __user *inbuf,
1386 int in_len, int out_len)
1388 struct rdma_ucm_migrate_id cmd;
1389 struct rdma_ucm_migrate_resp resp;
1390 struct ucma_context *ctx;
1392 struct ucma_file *cur_file;
1395 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1398 /* Get current fd to protect against it being closed */
1403 /* Validate current fd and prevent destruction of id. */
1404 ctx = ucma_get_ctx(f.file->private_data, cmd.id);
1410 cur_file = ctx->file;
1411 if (cur_file == new_file) {
1412 resp.events_reported = ctx->events_reported;
1417 * Migrate events between fd's, maintaining order, and avoiding new
1418 * events being added before existing events.
1420 ucma_lock_files(cur_file, new_file);
1423 list_move_tail(&ctx->list, &new_file->ctx_list);
1424 ucma_move_events(ctx, new_file);
1425 ctx->file = new_file;
1426 resp.events_reported = ctx->events_reported;
1429 ucma_unlock_files(cur_file, new_file);
1432 if (copy_to_user((void __user *)(unsigned long)cmd.response,
1433 &resp, sizeof(resp)))
1442 static ssize_t (*ucma_cmd_table[])(struct ucma_file *file,
1443 const char __user *inbuf,
1444 int in_len, int out_len) = {
1445 [RDMA_USER_CM_CMD_CREATE_ID] = ucma_create_id,
1446 [RDMA_USER_CM_CMD_DESTROY_ID] = ucma_destroy_id,
1447 [RDMA_USER_CM_CMD_BIND_IP] = ucma_bind_ip,
1448 [RDMA_USER_CM_CMD_RESOLVE_IP] = ucma_resolve_ip,
1449 [RDMA_USER_CM_CMD_RESOLVE_ROUTE] = ucma_resolve_route,
1450 [RDMA_USER_CM_CMD_QUERY_ROUTE] = ucma_query_route,
1451 [RDMA_USER_CM_CMD_CONNECT] = ucma_connect,
1452 [RDMA_USER_CM_CMD_LISTEN] = ucma_listen,
1453 [RDMA_USER_CM_CMD_ACCEPT] = ucma_accept,
1454 [RDMA_USER_CM_CMD_REJECT] = ucma_reject,
1455 [RDMA_USER_CM_CMD_DISCONNECT] = ucma_disconnect,
1456 [RDMA_USER_CM_CMD_INIT_QP_ATTR] = ucma_init_qp_attr,
1457 [RDMA_USER_CM_CMD_GET_EVENT] = ucma_get_event,
1458 [RDMA_USER_CM_CMD_GET_OPTION] = NULL,
1459 [RDMA_USER_CM_CMD_SET_OPTION] = ucma_set_option,
1460 [RDMA_USER_CM_CMD_NOTIFY] = ucma_notify,
1461 [RDMA_USER_CM_CMD_JOIN_IP_MCAST] = ucma_join_ip_multicast,
1462 [RDMA_USER_CM_CMD_LEAVE_MCAST] = ucma_leave_multicast,
1463 [RDMA_USER_CM_CMD_MIGRATE_ID] = ucma_migrate_id,
1464 [RDMA_USER_CM_CMD_QUERY] = ucma_query,
1465 [RDMA_USER_CM_CMD_BIND] = ucma_bind,
1466 [RDMA_USER_CM_CMD_RESOLVE_ADDR] = ucma_resolve_addr,
1467 [RDMA_USER_CM_CMD_JOIN_MCAST] = ucma_join_multicast
1470 static ssize_t ucma_write(struct file *filp, const char __user *buf,
1471 size_t len, loff_t *pos)
1473 struct ucma_file *file = filp->private_data;
1474 struct rdma_ucm_cmd_hdr hdr;
1477 if (len < sizeof(hdr))
1480 if (copy_from_user(&hdr, buf, sizeof(hdr)))
1483 if (hdr.cmd >= ARRAY_SIZE(ucma_cmd_table))
1486 if (hdr.in + sizeof(hdr) > len)
1489 if (!ucma_cmd_table[hdr.cmd])
1492 ret = ucma_cmd_table[hdr.cmd](file, buf + sizeof(hdr), hdr.in, hdr.out);
1499 static unsigned int ucma_poll(struct file *filp, struct poll_table_struct *wait)
1501 struct ucma_file *file = filp->private_data;
1502 unsigned int mask = 0;
1504 poll_wait(filp, &file->poll_wait, wait);
1506 if (!list_empty(&file->event_list))
1507 mask = POLLIN | POLLRDNORM;
1513 * ucma_open() does not need the BKL:
1515 * - no global state is referred to;
1516 * - there is no ioctl method to race against;
1517 * - no further module initialization is required for open to work
1518 * after the device is registered.
1520 static int ucma_open(struct inode *inode, struct file *filp)
1522 struct ucma_file *file;
1524 file = kmalloc(sizeof *file, GFP_KERNEL);
1528 INIT_LIST_HEAD(&file->event_list);
1529 INIT_LIST_HEAD(&file->ctx_list);
1530 init_waitqueue_head(&file->poll_wait);
1531 mutex_init(&file->mut);
1533 filp->private_data = file;
1536 return nonseekable_open(inode, filp);
1539 static int ucma_close(struct inode *inode, struct file *filp)
1541 struct ucma_file *file = filp->private_data;
1542 struct ucma_context *ctx, *tmp;
1544 mutex_lock(&file->mut);
1545 list_for_each_entry_safe(ctx, tmp, &file->ctx_list, list) {
1546 mutex_unlock(&file->mut);
1549 idr_remove(&ctx_idr, ctx->id);
1553 mutex_lock(&file->mut);
1555 mutex_unlock(&file->mut);
1560 static const struct file_operations ucma_fops = {
1561 .owner = THIS_MODULE,
1563 .release = ucma_close,
1564 .write = ucma_write,
1566 .llseek = no_llseek,
1569 static struct miscdevice ucma_misc = {
1570 .minor = MISC_DYNAMIC_MINOR,
1572 .nodename = "infiniband/rdma_cm",
1577 static ssize_t show_abi_version(struct device *dev,
1578 struct device_attribute *attr,
1581 return sprintf(buf, "%d\n", RDMA_USER_CM_ABI_VERSION);
1583 static DEVICE_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
1585 static int __init ucma_init(void)
1589 ret = misc_register(&ucma_misc);
1593 ret = device_create_file(ucma_misc.this_device, &dev_attr_abi_version);
1595 printk(KERN_ERR "rdma_ucm: couldn't create abi_version attr\n");
1599 ucma_ctl_table_hdr = register_net_sysctl(&init_net, "net/rdma_ucm", ucma_ctl_table);
1600 if (!ucma_ctl_table_hdr) {
1601 printk(KERN_ERR "rdma_ucm: couldn't register sysctl paths\n");
1607 device_remove_file(ucma_misc.this_device, &dev_attr_abi_version);
1609 misc_deregister(&ucma_misc);
1613 static void __exit ucma_cleanup(void)
1615 unregister_net_sysctl_table(ucma_ctl_table_hdr);
1616 device_remove_file(ucma_misc.this_device, &dev_attr_abi_version);
1617 misc_deregister(&ucma_misc);
1618 idr_destroy(&ctx_idr);
1619 idr_destroy(&multicast_idr);
1622 module_init(ucma_init);
1623 module_exit(ucma_cleanup);