2 * Copyright (c) 2005 Topspin Communications. All rights reserved.
3 * Copyright (c) 2005 Intel Corporation. All rights reserved.
5 * This software is available to you under a choice of one of two
6 * licenses. You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the
9 * OpenIB.org BSD license below:
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials
22 * provided with the distribution.
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
34 #include <linux/completion.h>
35 #include <linux/init.h>
37 #include <linux/module.h>
38 #include <linux/device.h>
39 #include <linux/err.h>
40 #include <linux/poll.h>
41 #include <linux/file.h>
42 #include <linux/mount.h>
43 #include <linux/cdev.h>
44 #include <linux/idr.h>
45 #include <linux/mutex.h>
47 #include <asm/uaccess.h>
49 #include <rdma/ib_cm.h>
50 #include <rdma/ib_user_cm.h>
51 #include <rdma/ib_marshall.h>
53 MODULE_AUTHOR("Libor Michalek");
54 MODULE_DESCRIPTION("InfiniBand userspace Connection Manager access");
55 MODULE_LICENSE("Dual BSD/GPL");
57 struct ib_ucm_device {
61 struct ib_device *ib_dev;
65 struct mutex file_mutex;
67 struct ib_ucm_device *device;
69 struct list_head ctxs;
70 struct list_head events;
71 wait_queue_head_t poll_wait;
74 struct ib_ucm_context {
76 struct completion comp;
80 struct ib_ucm_file *file;
81 struct ib_cm_id *cm_id;
84 struct list_head events; /* list of pending events. */
85 struct list_head file_list; /* member in file ctx list */
89 struct ib_ucm_context *ctx;
90 struct list_head file_list; /* member in file event list */
91 struct list_head ctx_list; /* member in ctx event list */
93 struct ib_cm_id *cm_id;
94 struct ib_ucm_event_resp resp;
103 IB_UCM_BASE_MINOR = 224,
104 IB_UCM_MAX_DEVICES = 32
107 /* ib_cm and ib_user_cm modules share /sys/class/infiniband_cm */
108 extern struct class cm_class;
110 #define IB_UCM_BASE_DEV MKDEV(IB_UCM_MAJOR, IB_UCM_BASE_MINOR)
112 static void ib_ucm_add_one(struct ib_device *device);
113 static void ib_ucm_remove_one(struct ib_device *device);
115 static struct ib_client ucm_client = {
117 .add = ib_ucm_add_one,
118 .remove = ib_ucm_remove_one
121 static DEFINE_MUTEX(ctx_id_mutex);
122 static DEFINE_IDR(ctx_id_table);
123 static DECLARE_BITMAP(dev_map, IB_UCM_MAX_DEVICES);
125 static struct ib_ucm_context *ib_ucm_ctx_get(struct ib_ucm_file *file, int id)
127 struct ib_ucm_context *ctx;
129 mutex_lock(&ctx_id_mutex);
130 ctx = idr_find(&ctx_id_table, id);
132 ctx = ERR_PTR(-ENOENT);
133 else if (ctx->file != file)
134 ctx = ERR_PTR(-EINVAL);
136 atomic_inc(&ctx->ref);
137 mutex_unlock(&ctx_id_mutex);
142 static void ib_ucm_ctx_put(struct ib_ucm_context *ctx)
144 if (atomic_dec_and_test(&ctx->ref))
145 complete(&ctx->comp);
148 static inline int ib_ucm_new_cm_id(int event)
150 return event == IB_CM_REQ_RECEIVED || event == IB_CM_SIDR_REQ_RECEIVED;
153 static void ib_ucm_cleanup_events(struct ib_ucm_context *ctx)
155 struct ib_ucm_event *uevent;
157 mutex_lock(&ctx->file->file_mutex);
158 list_del(&ctx->file_list);
159 while (!list_empty(&ctx->events)) {
161 uevent = list_entry(ctx->events.next,
162 struct ib_ucm_event, ctx_list);
163 list_del(&uevent->file_list);
164 list_del(&uevent->ctx_list);
165 mutex_unlock(&ctx->file->file_mutex);
167 /* clear incoming connections. */
168 if (ib_ucm_new_cm_id(uevent->resp.event))
169 ib_destroy_cm_id(uevent->cm_id);
172 mutex_lock(&ctx->file->file_mutex);
174 mutex_unlock(&ctx->file->file_mutex);
177 static struct ib_ucm_context *ib_ucm_ctx_alloc(struct ib_ucm_file *file)
179 struct ib_ucm_context *ctx;
182 ctx = kzalloc(sizeof *ctx, GFP_KERNEL);
186 atomic_set(&ctx->ref, 1);
187 init_completion(&ctx->comp);
189 INIT_LIST_HEAD(&ctx->events);
192 result = idr_pre_get(&ctx_id_table, GFP_KERNEL);
196 mutex_lock(&ctx_id_mutex);
197 result = idr_get_new(&ctx_id_table, ctx, &ctx->id);
198 mutex_unlock(&ctx_id_mutex);
199 } while (result == -EAGAIN);
204 list_add_tail(&ctx->file_list, &file->ctxs);
212 static void ib_ucm_event_req_get(struct ib_ucm_req_event_resp *ureq,
213 struct ib_cm_req_event_param *kreq)
215 ureq->remote_ca_guid = kreq->remote_ca_guid;
216 ureq->remote_qkey = kreq->remote_qkey;
217 ureq->remote_qpn = kreq->remote_qpn;
218 ureq->qp_type = kreq->qp_type;
219 ureq->starting_psn = kreq->starting_psn;
220 ureq->responder_resources = kreq->responder_resources;
221 ureq->initiator_depth = kreq->initiator_depth;
222 ureq->local_cm_response_timeout = kreq->local_cm_response_timeout;
223 ureq->flow_control = kreq->flow_control;
224 ureq->remote_cm_response_timeout = kreq->remote_cm_response_timeout;
225 ureq->retry_count = kreq->retry_count;
226 ureq->rnr_retry_count = kreq->rnr_retry_count;
227 ureq->srq = kreq->srq;
228 ureq->port = kreq->port;
230 ib_copy_path_rec_to_user(&ureq->primary_path, kreq->primary_path);
231 if (kreq->alternate_path)
232 ib_copy_path_rec_to_user(&ureq->alternate_path,
233 kreq->alternate_path);
236 static void ib_ucm_event_rep_get(struct ib_ucm_rep_event_resp *urep,
237 struct ib_cm_rep_event_param *krep)
239 urep->remote_ca_guid = krep->remote_ca_guid;
240 urep->remote_qkey = krep->remote_qkey;
241 urep->remote_qpn = krep->remote_qpn;
242 urep->starting_psn = krep->starting_psn;
243 urep->responder_resources = krep->responder_resources;
244 urep->initiator_depth = krep->initiator_depth;
245 urep->target_ack_delay = krep->target_ack_delay;
246 urep->failover_accepted = krep->failover_accepted;
247 urep->flow_control = krep->flow_control;
248 urep->rnr_retry_count = krep->rnr_retry_count;
249 urep->srq = krep->srq;
252 static void ib_ucm_event_sidr_rep_get(struct ib_ucm_sidr_rep_event_resp *urep,
253 struct ib_cm_sidr_rep_event_param *krep)
255 urep->status = krep->status;
256 urep->qkey = krep->qkey;
257 urep->qpn = krep->qpn;
260 static int ib_ucm_event_process(struct ib_cm_event *evt,
261 struct ib_ucm_event *uvt)
265 switch (evt->event) {
266 case IB_CM_REQ_RECEIVED:
267 ib_ucm_event_req_get(&uvt->resp.u.req_resp,
268 &evt->param.req_rcvd);
269 uvt->data_len = IB_CM_REQ_PRIVATE_DATA_SIZE;
270 uvt->resp.present = IB_UCM_PRES_PRIMARY;
271 uvt->resp.present |= (evt->param.req_rcvd.alternate_path ?
272 IB_UCM_PRES_ALTERNATE : 0);
274 case IB_CM_REP_RECEIVED:
275 ib_ucm_event_rep_get(&uvt->resp.u.rep_resp,
276 &evt->param.rep_rcvd);
277 uvt->data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
279 case IB_CM_RTU_RECEIVED:
280 uvt->data_len = IB_CM_RTU_PRIVATE_DATA_SIZE;
281 uvt->resp.u.send_status = evt->param.send_status;
283 case IB_CM_DREQ_RECEIVED:
284 uvt->data_len = IB_CM_DREQ_PRIVATE_DATA_SIZE;
285 uvt->resp.u.send_status = evt->param.send_status;
287 case IB_CM_DREP_RECEIVED:
288 uvt->data_len = IB_CM_DREP_PRIVATE_DATA_SIZE;
289 uvt->resp.u.send_status = evt->param.send_status;
291 case IB_CM_MRA_RECEIVED:
292 uvt->resp.u.mra_resp.timeout =
293 evt->param.mra_rcvd.service_timeout;
294 uvt->data_len = IB_CM_MRA_PRIVATE_DATA_SIZE;
296 case IB_CM_REJ_RECEIVED:
297 uvt->resp.u.rej_resp.reason = evt->param.rej_rcvd.reason;
298 uvt->data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
299 uvt->info_len = evt->param.rej_rcvd.ari_length;
300 info = evt->param.rej_rcvd.ari;
302 case IB_CM_LAP_RECEIVED:
303 ib_copy_path_rec_to_user(&uvt->resp.u.lap_resp.path,
304 evt->param.lap_rcvd.alternate_path);
305 uvt->data_len = IB_CM_LAP_PRIVATE_DATA_SIZE;
306 uvt->resp.present = IB_UCM_PRES_ALTERNATE;
308 case IB_CM_APR_RECEIVED:
309 uvt->resp.u.apr_resp.status = evt->param.apr_rcvd.ap_status;
310 uvt->data_len = IB_CM_APR_PRIVATE_DATA_SIZE;
311 uvt->info_len = evt->param.apr_rcvd.info_len;
312 info = evt->param.apr_rcvd.apr_info;
314 case IB_CM_SIDR_REQ_RECEIVED:
315 uvt->resp.u.sidr_req_resp.pkey =
316 evt->param.sidr_req_rcvd.pkey;
317 uvt->resp.u.sidr_req_resp.port =
318 evt->param.sidr_req_rcvd.port;
319 uvt->data_len = IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE;
321 case IB_CM_SIDR_REP_RECEIVED:
322 ib_ucm_event_sidr_rep_get(&uvt->resp.u.sidr_rep_resp,
323 &evt->param.sidr_rep_rcvd);
324 uvt->data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
325 uvt->info_len = evt->param.sidr_rep_rcvd.info_len;
326 info = evt->param.sidr_rep_rcvd.info;
329 uvt->resp.u.send_status = evt->param.send_status;
334 uvt->data = kmemdup(evt->private_data, uvt->data_len, GFP_KERNEL);
338 uvt->resp.present |= IB_UCM_PRES_DATA;
342 uvt->info = kmemdup(info, uvt->info_len, GFP_KERNEL);
346 uvt->resp.present |= IB_UCM_PRES_INFO;
356 static int ib_ucm_event_handler(struct ib_cm_id *cm_id,
357 struct ib_cm_event *event)
359 struct ib_ucm_event *uevent;
360 struct ib_ucm_context *ctx;
363 ctx = cm_id->context;
365 uevent = kzalloc(sizeof *uevent, GFP_KERNEL);
370 uevent->cm_id = cm_id;
371 uevent->resp.uid = ctx->uid;
372 uevent->resp.id = ctx->id;
373 uevent->resp.event = event->event;
375 result = ib_ucm_event_process(event, uevent);
379 mutex_lock(&ctx->file->file_mutex);
380 list_add_tail(&uevent->file_list, &ctx->file->events);
381 list_add_tail(&uevent->ctx_list, &ctx->events);
382 wake_up_interruptible(&ctx->file->poll_wait);
383 mutex_unlock(&ctx->file->file_mutex);
389 /* Destroy new cm_id's */
390 return ib_ucm_new_cm_id(event->event);
393 static ssize_t ib_ucm_event(struct ib_ucm_file *file,
394 const char __user *inbuf,
395 int in_len, int out_len)
397 struct ib_ucm_context *ctx;
398 struct ib_ucm_event_get cmd;
399 struct ib_ucm_event *uevent;
403 if (out_len < sizeof(struct ib_ucm_event_resp))
406 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
409 mutex_lock(&file->file_mutex);
410 while (list_empty(&file->events)) {
411 mutex_unlock(&file->file_mutex);
413 if (file->filp->f_flags & O_NONBLOCK)
416 if (wait_event_interruptible(file->poll_wait,
417 !list_empty(&file->events)))
420 mutex_lock(&file->file_mutex);
423 uevent = list_entry(file->events.next, struct ib_ucm_event, file_list);
425 if (ib_ucm_new_cm_id(uevent->resp.event)) {
426 ctx = ib_ucm_ctx_alloc(file);
432 ctx->cm_id = uevent->cm_id;
433 ctx->cm_id->context = ctx;
434 uevent->resp.id = ctx->id;
437 if (copy_to_user((void __user *)(unsigned long)cmd.response,
438 &uevent->resp, sizeof(uevent->resp))) {
444 if (cmd.data_len < uevent->data_len) {
448 if (copy_to_user((void __user *)(unsigned long)cmd.data,
449 uevent->data, uevent->data_len)) {
456 if (cmd.info_len < uevent->info_len) {
460 if (copy_to_user((void __user *)(unsigned long)cmd.info,
461 uevent->info, uevent->info_len)) {
467 list_del(&uevent->file_list);
468 list_del(&uevent->ctx_list);
469 uevent->ctx->events_reported++;
475 mutex_unlock(&file->file_mutex);
479 static ssize_t ib_ucm_create_id(struct ib_ucm_file *file,
480 const char __user *inbuf,
481 int in_len, int out_len)
483 struct ib_ucm_create_id cmd;
484 struct ib_ucm_create_id_resp resp;
485 struct ib_ucm_context *ctx;
488 if (out_len < sizeof(resp))
491 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
494 mutex_lock(&file->file_mutex);
495 ctx = ib_ucm_ctx_alloc(file);
496 mutex_unlock(&file->file_mutex);
501 ctx->cm_id = ib_create_cm_id(file->device->ib_dev,
502 ib_ucm_event_handler, ctx);
503 if (IS_ERR(ctx->cm_id)) {
504 result = PTR_ERR(ctx->cm_id);
509 if (copy_to_user((void __user *)(unsigned long)cmd.response,
510 &resp, sizeof(resp))) {
517 ib_destroy_cm_id(ctx->cm_id);
519 mutex_lock(&ctx_id_mutex);
520 idr_remove(&ctx_id_table, ctx->id);
521 mutex_unlock(&ctx_id_mutex);
526 static ssize_t ib_ucm_destroy_id(struct ib_ucm_file *file,
527 const char __user *inbuf,
528 int in_len, int out_len)
530 struct ib_ucm_destroy_id cmd;
531 struct ib_ucm_destroy_id_resp resp;
532 struct ib_ucm_context *ctx;
535 if (out_len < sizeof(resp))
538 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
541 mutex_lock(&ctx_id_mutex);
542 ctx = idr_find(&ctx_id_table, cmd.id);
544 ctx = ERR_PTR(-ENOENT);
545 else if (ctx->file != file)
546 ctx = ERR_PTR(-EINVAL);
548 idr_remove(&ctx_id_table, ctx->id);
549 mutex_unlock(&ctx_id_mutex);
555 wait_for_completion(&ctx->comp);
557 /* No new events will be generated after destroying the cm_id. */
558 ib_destroy_cm_id(ctx->cm_id);
559 /* Cleanup events not yet reported to the user. */
560 ib_ucm_cleanup_events(ctx);
562 resp.events_reported = ctx->events_reported;
563 if (copy_to_user((void __user *)(unsigned long)cmd.response,
564 &resp, sizeof(resp)))
571 static ssize_t ib_ucm_attr_id(struct ib_ucm_file *file,
572 const char __user *inbuf,
573 int in_len, int out_len)
575 struct ib_ucm_attr_id_resp resp;
576 struct ib_ucm_attr_id cmd;
577 struct ib_ucm_context *ctx;
580 if (out_len < sizeof(resp))
583 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
586 ctx = ib_ucm_ctx_get(file, cmd.id);
590 resp.service_id = ctx->cm_id->service_id;
591 resp.service_mask = ctx->cm_id->service_mask;
592 resp.local_id = ctx->cm_id->local_id;
593 resp.remote_id = ctx->cm_id->remote_id;
595 if (copy_to_user((void __user *)(unsigned long)cmd.response,
596 &resp, sizeof(resp)))
603 static ssize_t ib_ucm_init_qp_attr(struct ib_ucm_file *file,
604 const char __user *inbuf,
605 int in_len, int out_len)
607 struct ib_uverbs_qp_attr resp;
608 struct ib_ucm_init_qp_attr cmd;
609 struct ib_ucm_context *ctx;
610 struct ib_qp_attr qp_attr;
613 if (out_len < sizeof(resp))
616 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
619 ctx = ib_ucm_ctx_get(file, cmd.id);
623 resp.qp_attr_mask = 0;
624 memset(&qp_attr, 0, sizeof qp_attr);
625 qp_attr.qp_state = cmd.qp_state;
626 result = ib_cm_init_qp_attr(ctx->cm_id, &qp_attr, &resp.qp_attr_mask);
630 ib_copy_qp_attr_to_user(&resp, &qp_attr);
632 if (copy_to_user((void __user *)(unsigned long)cmd.response,
633 &resp, sizeof(resp)))
641 static int ucm_validate_listen(__be64 service_id, __be64 service_mask)
643 service_id &= service_mask;
645 if (((service_id & IB_CMA_SERVICE_ID_MASK) == IB_CMA_SERVICE_ID) ||
646 ((service_id & IB_SDP_SERVICE_ID_MASK) == IB_SDP_SERVICE_ID))
652 static ssize_t ib_ucm_listen(struct ib_ucm_file *file,
653 const char __user *inbuf,
654 int in_len, int out_len)
656 struct ib_ucm_listen cmd;
657 struct ib_ucm_context *ctx;
660 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
663 ctx = ib_ucm_ctx_get(file, cmd.id);
667 result = ucm_validate_listen(cmd.service_id, cmd.service_mask);
671 result = ib_cm_listen(ctx->cm_id, cmd.service_id, cmd.service_mask,
678 static ssize_t ib_ucm_notify(struct ib_ucm_file *file,
679 const char __user *inbuf,
680 int in_len, int out_len)
682 struct ib_ucm_notify cmd;
683 struct ib_ucm_context *ctx;
686 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
689 ctx = ib_ucm_ctx_get(file, cmd.id);
693 result = ib_cm_notify(ctx->cm_id, (enum ib_event_type) cmd.event);
698 static int ib_ucm_alloc_data(const void **dest, u64 src, u32 len)
707 data = kmalloc(len, GFP_KERNEL);
711 if (copy_from_user(data, (void __user *)(unsigned long)src, len)) {
720 static int ib_ucm_path_get(struct ib_sa_path_rec **path, u64 src)
722 struct ib_user_path_rec upath;
723 struct ib_sa_path_rec *sa_path;
730 sa_path = kmalloc(sizeof(*sa_path), GFP_KERNEL);
734 if (copy_from_user(&upath, (void __user *)(unsigned long)src,
741 ib_copy_path_rec_from_user(sa_path, &upath);
746 static ssize_t ib_ucm_send_req(struct ib_ucm_file *file,
747 const char __user *inbuf,
748 int in_len, int out_len)
750 struct ib_cm_req_param param;
751 struct ib_ucm_context *ctx;
752 struct ib_ucm_req cmd;
755 param.private_data = NULL;
756 param.primary_path = NULL;
757 param.alternate_path = NULL;
759 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
762 result = ib_ucm_alloc_data(¶m.private_data, cmd.data, cmd.len);
766 result = ib_ucm_path_get(¶m.primary_path, cmd.primary_path);
770 result = ib_ucm_path_get(¶m.alternate_path, cmd.alternate_path);
774 param.private_data_len = cmd.len;
775 param.service_id = cmd.sid;
776 param.qp_num = cmd.qpn;
777 param.qp_type = cmd.qp_type;
778 param.starting_psn = cmd.psn;
779 param.peer_to_peer = cmd.peer_to_peer;
780 param.responder_resources = cmd.responder_resources;
781 param.initiator_depth = cmd.initiator_depth;
782 param.remote_cm_response_timeout = cmd.remote_cm_response_timeout;
783 param.flow_control = cmd.flow_control;
784 param.local_cm_response_timeout = cmd.local_cm_response_timeout;
785 param.retry_count = cmd.retry_count;
786 param.rnr_retry_count = cmd.rnr_retry_count;
787 param.max_cm_retries = cmd.max_cm_retries;
790 ctx = ib_ucm_ctx_get(file, cmd.id);
792 result = ib_send_cm_req(ctx->cm_id, ¶m);
795 result = PTR_ERR(ctx);
798 kfree(param.private_data);
799 kfree(param.primary_path);
800 kfree(param.alternate_path);
804 static ssize_t ib_ucm_send_rep(struct ib_ucm_file *file,
805 const char __user *inbuf,
806 int in_len, int out_len)
808 struct ib_cm_rep_param param;
809 struct ib_ucm_context *ctx;
810 struct ib_ucm_rep cmd;
813 param.private_data = NULL;
815 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
818 result = ib_ucm_alloc_data(¶m.private_data, cmd.data, cmd.len);
822 param.qp_num = cmd.qpn;
823 param.starting_psn = cmd.psn;
824 param.private_data_len = cmd.len;
825 param.responder_resources = cmd.responder_resources;
826 param.initiator_depth = cmd.initiator_depth;
827 param.failover_accepted = cmd.failover_accepted;
828 param.flow_control = cmd.flow_control;
829 param.rnr_retry_count = cmd.rnr_retry_count;
832 ctx = ib_ucm_ctx_get(file, cmd.id);
835 result = ib_send_cm_rep(ctx->cm_id, ¶m);
838 result = PTR_ERR(ctx);
840 kfree(param.private_data);
844 static ssize_t ib_ucm_send_private_data(struct ib_ucm_file *file,
845 const char __user *inbuf, int in_len,
846 int (*func)(struct ib_cm_id *cm_id,
847 const void *private_data,
848 u8 private_data_len))
850 struct ib_ucm_private_data cmd;
851 struct ib_ucm_context *ctx;
852 const void *private_data = NULL;
855 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
858 result = ib_ucm_alloc_data(&private_data, cmd.data, cmd.len);
862 ctx = ib_ucm_ctx_get(file, cmd.id);
864 result = func(ctx->cm_id, private_data, cmd.len);
867 result = PTR_ERR(ctx);
873 static ssize_t ib_ucm_send_rtu(struct ib_ucm_file *file,
874 const char __user *inbuf,
875 int in_len, int out_len)
877 return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_rtu);
880 static ssize_t ib_ucm_send_dreq(struct ib_ucm_file *file,
881 const char __user *inbuf,
882 int in_len, int out_len)
884 return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_dreq);
887 static ssize_t ib_ucm_send_drep(struct ib_ucm_file *file,
888 const char __user *inbuf,
889 int in_len, int out_len)
891 return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_drep);
894 static ssize_t ib_ucm_send_info(struct ib_ucm_file *file,
895 const char __user *inbuf, int in_len,
896 int (*func)(struct ib_cm_id *cm_id,
903 struct ib_ucm_context *ctx;
904 struct ib_ucm_info cmd;
905 const void *data = NULL;
906 const void *info = NULL;
909 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
912 result = ib_ucm_alloc_data(&data, cmd.data, cmd.data_len);
916 result = ib_ucm_alloc_data(&info, cmd.info, cmd.info_len);
920 ctx = ib_ucm_ctx_get(file, cmd.id);
922 result = func(ctx->cm_id, cmd.status, info, cmd.info_len,
926 result = PTR_ERR(ctx);
934 static ssize_t ib_ucm_send_rej(struct ib_ucm_file *file,
935 const char __user *inbuf,
936 int in_len, int out_len)
938 return ib_ucm_send_info(file, inbuf, in_len, (void *)ib_send_cm_rej);
941 static ssize_t ib_ucm_send_apr(struct ib_ucm_file *file,
942 const char __user *inbuf,
943 int in_len, int out_len)
945 return ib_ucm_send_info(file, inbuf, in_len, (void *)ib_send_cm_apr);
948 static ssize_t ib_ucm_send_mra(struct ib_ucm_file *file,
949 const char __user *inbuf,
950 int in_len, int out_len)
952 struct ib_ucm_context *ctx;
953 struct ib_ucm_mra cmd;
954 const void *data = NULL;
957 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
960 result = ib_ucm_alloc_data(&data, cmd.data, cmd.len);
964 ctx = ib_ucm_ctx_get(file, cmd.id);
966 result = ib_send_cm_mra(ctx->cm_id, cmd.timeout, data, cmd.len);
969 result = PTR_ERR(ctx);
975 static ssize_t ib_ucm_send_lap(struct ib_ucm_file *file,
976 const char __user *inbuf,
977 int in_len, int out_len)
979 struct ib_ucm_context *ctx;
980 struct ib_sa_path_rec *path = NULL;
981 struct ib_ucm_lap cmd;
982 const void *data = NULL;
985 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
988 result = ib_ucm_alloc_data(&data, cmd.data, cmd.len);
992 result = ib_ucm_path_get(&path, cmd.path);
996 ctx = ib_ucm_ctx_get(file, cmd.id);
998 result = ib_send_cm_lap(ctx->cm_id, path, data, cmd.len);
1001 result = PTR_ERR(ctx);
1009 static ssize_t ib_ucm_send_sidr_req(struct ib_ucm_file *file,
1010 const char __user *inbuf,
1011 int in_len, int out_len)
1013 struct ib_cm_sidr_req_param param;
1014 struct ib_ucm_context *ctx;
1015 struct ib_ucm_sidr_req cmd;
1018 param.private_data = NULL;
1021 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1024 result = ib_ucm_alloc_data(¶m.private_data, cmd.data, cmd.len);
1028 result = ib_ucm_path_get(¶m.path, cmd.path);
1032 param.private_data_len = cmd.len;
1033 param.service_id = cmd.sid;
1034 param.timeout_ms = cmd.timeout;
1035 param.max_cm_retries = cmd.max_cm_retries;
1037 ctx = ib_ucm_ctx_get(file, cmd.id);
1039 result = ib_send_cm_sidr_req(ctx->cm_id, ¶m);
1040 ib_ucm_ctx_put(ctx);
1042 result = PTR_ERR(ctx);
1045 kfree(param.private_data);
1050 static ssize_t ib_ucm_send_sidr_rep(struct ib_ucm_file *file,
1051 const char __user *inbuf,
1052 int in_len, int out_len)
1054 struct ib_cm_sidr_rep_param param;
1055 struct ib_ucm_sidr_rep cmd;
1056 struct ib_ucm_context *ctx;
1061 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1064 result = ib_ucm_alloc_data(¶m.private_data,
1065 cmd.data, cmd.data_len);
1069 result = ib_ucm_alloc_data(¶m.info, cmd.info, cmd.info_len);
1073 param.qp_num = cmd.qpn;
1074 param.qkey = cmd.qkey;
1075 param.status = cmd.status;
1076 param.info_length = cmd.info_len;
1077 param.private_data_len = cmd.data_len;
1079 ctx = ib_ucm_ctx_get(file, cmd.id);
1081 result = ib_send_cm_sidr_rep(ctx->cm_id, ¶m);
1082 ib_ucm_ctx_put(ctx);
1084 result = PTR_ERR(ctx);
1087 kfree(param.private_data);
1092 static ssize_t (*ucm_cmd_table[])(struct ib_ucm_file *file,
1093 const char __user *inbuf,
1094 int in_len, int out_len) = {
1095 [IB_USER_CM_CMD_CREATE_ID] = ib_ucm_create_id,
1096 [IB_USER_CM_CMD_DESTROY_ID] = ib_ucm_destroy_id,
1097 [IB_USER_CM_CMD_ATTR_ID] = ib_ucm_attr_id,
1098 [IB_USER_CM_CMD_LISTEN] = ib_ucm_listen,
1099 [IB_USER_CM_CMD_NOTIFY] = ib_ucm_notify,
1100 [IB_USER_CM_CMD_SEND_REQ] = ib_ucm_send_req,
1101 [IB_USER_CM_CMD_SEND_REP] = ib_ucm_send_rep,
1102 [IB_USER_CM_CMD_SEND_RTU] = ib_ucm_send_rtu,
1103 [IB_USER_CM_CMD_SEND_DREQ] = ib_ucm_send_dreq,
1104 [IB_USER_CM_CMD_SEND_DREP] = ib_ucm_send_drep,
1105 [IB_USER_CM_CMD_SEND_REJ] = ib_ucm_send_rej,
1106 [IB_USER_CM_CMD_SEND_MRA] = ib_ucm_send_mra,
1107 [IB_USER_CM_CMD_SEND_LAP] = ib_ucm_send_lap,
1108 [IB_USER_CM_CMD_SEND_APR] = ib_ucm_send_apr,
1109 [IB_USER_CM_CMD_SEND_SIDR_REQ] = ib_ucm_send_sidr_req,
1110 [IB_USER_CM_CMD_SEND_SIDR_REP] = ib_ucm_send_sidr_rep,
1111 [IB_USER_CM_CMD_EVENT] = ib_ucm_event,
1112 [IB_USER_CM_CMD_INIT_QP_ATTR] = ib_ucm_init_qp_attr,
1115 static ssize_t ib_ucm_write(struct file *filp, const char __user *buf,
1116 size_t len, loff_t *pos)
1118 struct ib_ucm_file *file = filp->private_data;
1119 struct ib_ucm_cmd_hdr hdr;
1122 if (len < sizeof(hdr))
1125 if (copy_from_user(&hdr, buf, sizeof(hdr)))
1128 if (hdr.cmd < 0 || hdr.cmd >= ARRAY_SIZE(ucm_cmd_table))
1131 if (hdr.in + sizeof(hdr) > len)
1134 result = ucm_cmd_table[hdr.cmd](file, buf + sizeof(hdr),
1142 static unsigned int ib_ucm_poll(struct file *filp,
1143 struct poll_table_struct *wait)
1145 struct ib_ucm_file *file = filp->private_data;
1146 unsigned int mask = 0;
1148 poll_wait(filp, &file->poll_wait, wait);
1150 if (!list_empty(&file->events))
1151 mask = POLLIN | POLLRDNORM;
1157 * ib_ucm_open() does not need the BKL:
1159 * - no global state is referred to;
1160 * - there is no ioctl method to race against;
1161 * - no further module initialization is required for open to work
1162 * after the device is registered.
1164 static int ib_ucm_open(struct inode *inode, struct file *filp)
1166 struct ib_ucm_file *file;
1168 file = kmalloc(sizeof(*file), GFP_KERNEL);
1172 INIT_LIST_HEAD(&file->events);
1173 INIT_LIST_HEAD(&file->ctxs);
1174 init_waitqueue_head(&file->poll_wait);
1176 mutex_init(&file->file_mutex);
1178 filp->private_data = file;
1180 file->device = container_of(inode->i_cdev, struct ib_ucm_device, cdev);
1185 static int ib_ucm_close(struct inode *inode, struct file *filp)
1187 struct ib_ucm_file *file = filp->private_data;
1188 struct ib_ucm_context *ctx;
1190 mutex_lock(&file->file_mutex);
1191 while (!list_empty(&file->ctxs)) {
1192 ctx = list_entry(file->ctxs.next,
1193 struct ib_ucm_context, file_list);
1194 mutex_unlock(&file->file_mutex);
1196 mutex_lock(&ctx_id_mutex);
1197 idr_remove(&ctx_id_table, ctx->id);
1198 mutex_unlock(&ctx_id_mutex);
1200 ib_destroy_cm_id(ctx->cm_id);
1201 ib_ucm_cleanup_events(ctx);
1204 mutex_lock(&file->file_mutex);
1206 mutex_unlock(&file->file_mutex);
1211 static void ib_ucm_release_dev(struct device *dev)
1213 struct ib_ucm_device *ucm_dev;
1215 ucm_dev = container_of(dev, struct ib_ucm_device, dev);
1216 cdev_del(&ucm_dev->cdev);
1217 clear_bit(ucm_dev->devnum, dev_map);
1221 static const struct file_operations ucm_fops = {
1222 .owner = THIS_MODULE,
1223 .open = ib_ucm_open,
1224 .release = ib_ucm_close,
1225 .write = ib_ucm_write,
1226 .poll = ib_ucm_poll,
1229 static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
1232 struct ib_ucm_device *ucm_dev;
1234 ucm_dev = container_of(dev, struct ib_ucm_device, dev);
1235 return sprintf(buf, "%s\n", ucm_dev->ib_dev->name);
1237 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1239 static void ib_ucm_add_one(struct ib_device *device)
1241 struct ib_ucm_device *ucm_dev;
1243 if (!device->alloc_ucontext ||
1244 rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1247 ucm_dev = kzalloc(sizeof *ucm_dev, GFP_KERNEL);
1251 ucm_dev->ib_dev = device;
1253 ucm_dev->devnum = find_first_zero_bit(dev_map, IB_UCM_MAX_DEVICES);
1254 if (ucm_dev->devnum >= IB_UCM_MAX_DEVICES)
1257 set_bit(ucm_dev->devnum, dev_map);
1259 cdev_init(&ucm_dev->cdev, &ucm_fops);
1260 ucm_dev->cdev.owner = THIS_MODULE;
1261 kobject_set_name(&ucm_dev->cdev.kobj, "ucm%d", ucm_dev->devnum);
1262 if (cdev_add(&ucm_dev->cdev, IB_UCM_BASE_DEV + ucm_dev->devnum, 1))
1265 ucm_dev->dev.class = &cm_class;
1266 ucm_dev->dev.parent = device->dma_device;
1267 ucm_dev->dev.devt = ucm_dev->cdev.dev;
1268 ucm_dev->dev.release = ib_ucm_release_dev;
1269 dev_set_name(&ucm_dev->dev, "ucm%d", ucm_dev->devnum);
1270 if (device_register(&ucm_dev->dev))
1273 if (device_create_file(&ucm_dev->dev, &dev_attr_ibdev))
1276 ib_set_client_data(device, &ucm_client, ucm_dev);
1280 device_unregister(&ucm_dev->dev);
1282 cdev_del(&ucm_dev->cdev);
1283 clear_bit(ucm_dev->devnum, dev_map);
1289 static void ib_ucm_remove_one(struct ib_device *device)
1291 struct ib_ucm_device *ucm_dev = ib_get_client_data(device, &ucm_client);
1296 device_unregister(&ucm_dev->dev);
1299 static ssize_t show_abi_version(struct class *class, char *buf)
1301 return sprintf(buf, "%d\n", IB_USER_CM_ABI_VERSION);
1303 static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
1305 static int __init ib_ucm_init(void)
1309 ret = register_chrdev_region(IB_UCM_BASE_DEV, IB_UCM_MAX_DEVICES,
1312 printk(KERN_ERR "ucm: couldn't register device number\n");
1316 ret = class_create_file(&cm_class, &class_attr_abi_version);
1318 printk(KERN_ERR "ucm: couldn't create abi_version attribute\n");
1322 ret = ib_register_client(&ucm_client);
1324 printk(KERN_ERR "ucm: couldn't register client\n");
1330 class_remove_file(&cm_class, &class_attr_abi_version);
1332 unregister_chrdev_region(IB_UCM_BASE_DEV, IB_UCM_MAX_DEVICES);
1337 static void __exit ib_ucm_cleanup(void)
1339 ib_unregister_client(&ucm_client);
1340 class_remove_file(&cm_class, &class_attr_abi_version);
1341 unregister_chrdev_region(IB_UCM_BASE_DEV, IB_UCM_MAX_DEVICES);
1342 idr_destroy(&ctx_id_table);
1345 module_init(ib_ucm_init);
1346 module_exit(ib_ucm_cleanup);