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/sched.h>
42 #include <linux/file.h>
43 #include <linux/mount.h>
44 #include <linux/cdev.h>
45 #include <linux/idr.h>
46 #include <linux/mutex.h>
47 #include <linux/slab.h>
49 #include <asm/uaccess.h>
51 #include <rdma/ib_cm.h>
52 #include <rdma/ib_user_cm.h>
53 #include <rdma/ib_marshall.h>
55 MODULE_AUTHOR("Libor Michalek");
56 MODULE_DESCRIPTION("InfiniBand userspace Connection Manager access");
57 MODULE_LICENSE("Dual BSD/GPL");
59 struct ib_ucm_device {
63 struct ib_device *ib_dev;
67 struct mutex file_mutex;
69 struct ib_ucm_device *device;
71 struct list_head ctxs;
72 struct list_head events;
73 wait_queue_head_t poll_wait;
76 struct ib_ucm_context {
78 struct completion comp;
82 struct ib_ucm_file *file;
83 struct ib_cm_id *cm_id;
86 struct list_head events; /* list of pending events. */
87 struct list_head file_list; /* member in file ctx list */
91 struct ib_ucm_context *ctx;
92 struct list_head file_list; /* member in file event list */
93 struct list_head ctx_list; /* member in ctx event list */
95 struct ib_cm_id *cm_id;
96 struct ib_ucm_event_resp resp;
105 IB_UCM_BASE_MINOR = 224,
106 IB_UCM_MAX_DEVICES = 32
109 #define IB_UCM_BASE_DEV MKDEV(IB_UCM_MAJOR, IB_UCM_BASE_MINOR)
111 static void ib_ucm_add_one(struct ib_device *device);
112 static void ib_ucm_remove_one(struct ib_device *device);
114 static struct ib_client ucm_client = {
116 .add = ib_ucm_add_one,
117 .remove = ib_ucm_remove_one
120 static DEFINE_MUTEX(ctx_id_mutex);
121 static DEFINE_IDR(ctx_id_table);
122 static DECLARE_BITMAP(dev_map, IB_UCM_MAX_DEVICES);
124 static struct ib_ucm_context *ib_ucm_ctx_get(struct ib_ucm_file *file, int id)
126 struct ib_ucm_context *ctx;
128 mutex_lock(&ctx_id_mutex);
129 ctx = idr_find(&ctx_id_table, id);
131 ctx = ERR_PTR(-ENOENT);
132 else if (ctx->file != file)
133 ctx = ERR_PTR(-EINVAL);
135 atomic_inc(&ctx->ref);
136 mutex_unlock(&ctx_id_mutex);
141 static void ib_ucm_ctx_put(struct ib_ucm_context *ctx)
143 if (atomic_dec_and_test(&ctx->ref))
144 complete(&ctx->comp);
147 static inline int ib_ucm_new_cm_id(int event)
149 return event == IB_CM_REQ_RECEIVED || event == IB_CM_SIDR_REQ_RECEIVED;
152 static void ib_ucm_cleanup_events(struct ib_ucm_context *ctx)
154 struct ib_ucm_event *uevent;
156 mutex_lock(&ctx->file->file_mutex);
157 list_del(&ctx->file_list);
158 while (!list_empty(&ctx->events)) {
160 uevent = list_entry(ctx->events.next,
161 struct ib_ucm_event, ctx_list);
162 list_del(&uevent->file_list);
163 list_del(&uevent->ctx_list);
164 mutex_unlock(&ctx->file->file_mutex);
166 /* clear incoming connections. */
167 if (ib_ucm_new_cm_id(uevent->resp.event))
168 ib_destroy_cm_id(uevent->cm_id);
171 mutex_lock(&ctx->file->file_mutex);
173 mutex_unlock(&ctx->file->file_mutex);
176 static struct ib_ucm_context *ib_ucm_ctx_alloc(struct ib_ucm_file *file)
178 struct ib_ucm_context *ctx;
180 ctx = kzalloc(sizeof *ctx, GFP_KERNEL);
184 atomic_set(&ctx->ref, 1);
185 init_completion(&ctx->comp);
187 INIT_LIST_HEAD(&ctx->events);
189 mutex_lock(&ctx_id_mutex);
190 ctx->id = idr_alloc(&ctx_id_table, ctx, 0, 0, GFP_KERNEL);
191 mutex_unlock(&ctx_id_mutex);
195 list_add_tail(&ctx->file_list, &file->ctxs);
203 static void ib_ucm_event_req_get(struct ib_ucm_req_event_resp *ureq,
204 struct ib_cm_req_event_param *kreq)
206 ureq->remote_ca_guid = kreq->remote_ca_guid;
207 ureq->remote_qkey = kreq->remote_qkey;
208 ureq->remote_qpn = kreq->remote_qpn;
209 ureq->qp_type = kreq->qp_type;
210 ureq->starting_psn = kreq->starting_psn;
211 ureq->responder_resources = kreq->responder_resources;
212 ureq->initiator_depth = kreq->initiator_depth;
213 ureq->local_cm_response_timeout = kreq->local_cm_response_timeout;
214 ureq->flow_control = kreq->flow_control;
215 ureq->remote_cm_response_timeout = kreq->remote_cm_response_timeout;
216 ureq->retry_count = kreq->retry_count;
217 ureq->rnr_retry_count = kreq->rnr_retry_count;
218 ureq->srq = kreq->srq;
219 ureq->port = kreq->port;
221 ib_copy_path_rec_to_user(&ureq->primary_path, kreq->primary_path);
222 if (kreq->alternate_path)
223 ib_copy_path_rec_to_user(&ureq->alternate_path,
224 kreq->alternate_path);
227 static void ib_ucm_event_rep_get(struct ib_ucm_rep_event_resp *urep,
228 struct ib_cm_rep_event_param *krep)
230 urep->remote_ca_guid = krep->remote_ca_guid;
231 urep->remote_qkey = krep->remote_qkey;
232 urep->remote_qpn = krep->remote_qpn;
233 urep->starting_psn = krep->starting_psn;
234 urep->responder_resources = krep->responder_resources;
235 urep->initiator_depth = krep->initiator_depth;
236 urep->target_ack_delay = krep->target_ack_delay;
237 urep->failover_accepted = krep->failover_accepted;
238 urep->flow_control = krep->flow_control;
239 urep->rnr_retry_count = krep->rnr_retry_count;
240 urep->srq = krep->srq;
243 static void ib_ucm_event_sidr_rep_get(struct ib_ucm_sidr_rep_event_resp *urep,
244 struct ib_cm_sidr_rep_event_param *krep)
246 urep->status = krep->status;
247 urep->qkey = krep->qkey;
248 urep->qpn = krep->qpn;
251 static int ib_ucm_event_process(struct ib_cm_event *evt,
252 struct ib_ucm_event *uvt)
256 switch (evt->event) {
257 case IB_CM_REQ_RECEIVED:
258 ib_ucm_event_req_get(&uvt->resp.u.req_resp,
259 &evt->param.req_rcvd);
260 uvt->data_len = IB_CM_REQ_PRIVATE_DATA_SIZE;
261 uvt->resp.present = IB_UCM_PRES_PRIMARY;
262 uvt->resp.present |= (evt->param.req_rcvd.alternate_path ?
263 IB_UCM_PRES_ALTERNATE : 0);
265 case IB_CM_REP_RECEIVED:
266 ib_ucm_event_rep_get(&uvt->resp.u.rep_resp,
267 &evt->param.rep_rcvd);
268 uvt->data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
270 case IB_CM_RTU_RECEIVED:
271 uvt->data_len = IB_CM_RTU_PRIVATE_DATA_SIZE;
272 uvt->resp.u.send_status = evt->param.send_status;
274 case IB_CM_DREQ_RECEIVED:
275 uvt->data_len = IB_CM_DREQ_PRIVATE_DATA_SIZE;
276 uvt->resp.u.send_status = evt->param.send_status;
278 case IB_CM_DREP_RECEIVED:
279 uvt->data_len = IB_CM_DREP_PRIVATE_DATA_SIZE;
280 uvt->resp.u.send_status = evt->param.send_status;
282 case IB_CM_MRA_RECEIVED:
283 uvt->resp.u.mra_resp.timeout =
284 evt->param.mra_rcvd.service_timeout;
285 uvt->data_len = IB_CM_MRA_PRIVATE_DATA_SIZE;
287 case IB_CM_REJ_RECEIVED:
288 uvt->resp.u.rej_resp.reason = evt->param.rej_rcvd.reason;
289 uvt->data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
290 uvt->info_len = evt->param.rej_rcvd.ari_length;
291 info = evt->param.rej_rcvd.ari;
293 case IB_CM_LAP_RECEIVED:
294 ib_copy_path_rec_to_user(&uvt->resp.u.lap_resp.path,
295 evt->param.lap_rcvd.alternate_path);
296 uvt->data_len = IB_CM_LAP_PRIVATE_DATA_SIZE;
297 uvt->resp.present = IB_UCM_PRES_ALTERNATE;
299 case IB_CM_APR_RECEIVED:
300 uvt->resp.u.apr_resp.status = evt->param.apr_rcvd.ap_status;
301 uvt->data_len = IB_CM_APR_PRIVATE_DATA_SIZE;
302 uvt->info_len = evt->param.apr_rcvd.info_len;
303 info = evt->param.apr_rcvd.apr_info;
305 case IB_CM_SIDR_REQ_RECEIVED:
306 uvt->resp.u.sidr_req_resp.pkey =
307 evt->param.sidr_req_rcvd.pkey;
308 uvt->resp.u.sidr_req_resp.port =
309 evt->param.sidr_req_rcvd.port;
310 uvt->data_len = IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE;
312 case IB_CM_SIDR_REP_RECEIVED:
313 ib_ucm_event_sidr_rep_get(&uvt->resp.u.sidr_rep_resp,
314 &evt->param.sidr_rep_rcvd);
315 uvt->data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
316 uvt->info_len = evt->param.sidr_rep_rcvd.info_len;
317 info = evt->param.sidr_rep_rcvd.info;
320 uvt->resp.u.send_status = evt->param.send_status;
325 uvt->data = kmemdup(evt->private_data, uvt->data_len, GFP_KERNEL);
329 uvt->resp.present |= IB_UCM_PRES_DATA;
333 uvt->info = kmemdup(info, uvt->info_len, GFP_KERNEL);
337 uvt->resp.present |= IB_UCM_PRES_INFO;
347 static int ib_ucm_event_handler(struct ib_cm_id *cm_id,
348 struct ib_cm_event *event)
350 struct ib_ucm_event *uevent;
351 struct ib_ucm_context *ctx;
354 ctx = cm_id->context;
356 uevent = kzalloc(sizeof *uevent, GFP_KERNEL);
361 uevent->cm_id = cm_id;
362 uevent->resp.uid = ctx->uid;
363 uevent->resp.id = ctx->id;
364 uevent->resp.event = event->event;
366 result = ib_ucm_event_process(event, uevent);
370 mutex_lock(&ctx->file->file_mutex);
371 list_add_tail(&uevent->file_list, &ctx->file->events);
372 list_add_tail(&uevent->ctx_list, &ctx->events);
373 wake_up_interruptible(&ctx->file->poll_wait);
374 mutex_unlock(&ctx->file->file_mutex);
380 /* Destroy new cm_id's */
381 return ib_ucm_new_cm_id(event->event);
384 static ssize_t ib_ucm_event(struct ib_ucm_file *file,
385 const char __user *inbuf,
386 int in_len, int out_len)
388 struct ib_ucm_context *ctx;
389 struct ib_ucm_event_get cmd;
390 struct ib_ucm_event *uevent;
393 if (out_len < sizeof(struct ib_ucm_event_resp))
396 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
399 mutex_lock(&file->file_mutex);
400 while (list_empty(&file->events)) {
401 mutex_unlock(&file->file_mutex);
403 if (file->filp->f_flags & O_NONBLOCK)
406 if (wait_event_interruptible(file->poll_wait,
407 !list_empty(&file->events)))
410 mutex_lock(&file->file_mutex);
413 uevent = list_entry(file->events.next, struct ib_ucm_event, file_list);
415 if (ib_ucm_new_cm_id(uevent->resp.event)) {
416 ctx = ib_ucm_ctx_alloc(file);
422 ctx->cm_id = uevent->cm_id;
423 ctx->cm_id->context = ctx;
424 uevent->resp.id = ctx->id;
427 if (copy_to_user((void __user *)(unsigned long)cmd.response,
428 &uevent->resp, sizeof(uevent->resp))) {
434 if (cmd.data_len < uevent->data_len) {
438 if (copy_to_user((void __user *)(unsigned long)cmd.data,
439 uevent->data, uevent->data_len)) {
446 if (cmd.info_len < uevent->info_len) {
450 if (copy_to_user((void __user *)(unsigned long)cmd.info,
451 uevent->info, uevent->info_len)) {
457 list_del(&uevent->file_list);
458 list_del(&uevent->ctx_list);
459 uevent->ctx->events_reported++;
465 mutex_unlock(&file->file_mutex);
469 static ssize_t ib_ucm_create_id(struct ib_ucm_file *file,
470 const char __user *inbuf,
471 int in_len, int out_len)
473 struct ib_ucm_create_id cmd;
474 struct ib_ucm_create_id_resp resp;
475 struct ib_ucm_context *ctx;
478 if (out_len < sizeof(resp))
481 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
484 mutex_lock(&file->file_mutex);
485 ctx = ib_ucm_ctx_alloc(file);
486 mutex_unlock(&file->file_mutex);
491 ctx->cm_id = ib_create_cm_id(file->device->ib_dev,
492 ib_ucm_event_handler, ctx);
493 if (IS_ERR(ctx->cm_id)) {
494 result = PTR_ERR(ctx->cm_id);
499 if (copy_to_user((void __user *)(unsigned long)cmd.response,
500 &resp, sizeof(resp))) {
507 ib_destroy_cm_id(ctx->cm_id);
509 mutex_lock(&ctx_id_mutex);
510 idr_remove(&ctx_id_table, ctx->id);
511 mutex_unlock(&ctx_id_mutex);
516 static ssize_t ib_ucm_destroy_id(struct ib_ucm_file *file,
517 const char __user *inbuf,
518 int in_len, int out_len)
520 struct ib_ucm_destroy_id cmd;
521 struct ib_ucm_destroy_id_resp resp;
522 struct ib_ucm_context *ctx;
525 if (out_len < sizeof(resp))
528 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
531 mutex_lock(&ctx_id_mutex);
532 ctx = idr_find(&ctx_id_table, cmd.id);
534 ctx = ERR_PTR(-ENOENT);
535 else if (ctx->file != file)
536 ctx = ERR_PTR(-EINVAL);
538 idr_remove(&ctx_id_table, ctx->id);
539 mutex_unlock(&ctx_id_mutex);
545 wait_for_completion(&ctx->comp);
547 /* No new events will be generated after destroying the cm_id. */
548 ib_destroy_cm_id(ctx->cm_id);
549 /* Cleanup events not yet reported to the user. */
550 ib_ucm_cleanup_events(ctx);
552 resp.events_reported = ctx->events_reported;
553 if (copy_to_user((void __user *)(unsigned long)cmd.response,
554 &resp, sizeof(resp)))
561 static ssize_t ib_ucm_attr_id(struct ib_ucm_file *file,
562 const char __user *inbuf,
563 int in_len, int out_len)
565 struct ib_ucm_attr_id_resp resp;
566 struct ib_ucm_attr_id cmd;
567 struct ib_ucm_context *ctx;
570 if (out_len < sizeof(resp))
573 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
576 ctx = ib_ucm_ctx_get(file, cmd.id);
580 resp.service_id = ctx->cm_id->service_id;
581 resp.service_mask = ctx->cm_id->service_mask;
582 resp.local_id = ctx->cm_id->local_id;
583 resp.remote_id = ctx->cm_id->remote_id;
585 if (copy_to_user((void __user *)(unsigned long)cmd.response,
586 &resp, sizeof(resp)))
593 static ssize_t ib_ucm_init_qp_attr(struct ib_ucm_file *file,
594 const char __user *inbuf,
595 int in_len, int out_len)
597 struct ib_uverbs_qp_attr resp;
598 struct ib_ucm_init_qp_attr cmd;
599 struct ib_ucm_context *ctx;
600 struct ib_qp_attr qp_attr;
603 if (out_len < sizeof(resp))
606 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
609 ctx = ib_ucm_ctx_get(file, cmd.id);
613 resp.qp_attr_mask = 0;
614 memset(&qp_attr, 0, sizeof qp_attr);
615 qp_attr.qp_state = cmd.qp_state;
616 result = ib_cm_init_qp_attr(ctx->cm_id, &qp_attr, &resp.qp_attr_mask);
620 ib_copy_qp_attr_to_user(&resp, &qp_attr);
622 if (copy_to_user((void __user *)(unsigned long)cmd.response,
623 &resp, sizeof(resp)))
631 static int ucm_validate_listen(__be64 service_id, __be64 service_mask)
633 service_id &= service_mask;
635 if (((service_id & IB_CMA_SERVICE_ID_MASK) == IB_CMA_SERVICE_ID) ||
636 ((service_id & IB_SDP_SERVICE_ID_MASK) == IB_SDP_SERVICE_ID))
642 static ssize_t ib_ucm_listen(struct ib_ucm_file *file,
643 const char __user *inbuf,
644 int in_len, int out_len)
646 struct ib_ucm_listen cmd;
647 struct ib_ucm_context *ctx;
650 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
653 ctx = ib_ucm_ctx_get(file, cmd.id);
657 result = ucm_validate_listen(cmd.service_id, cmd.service_mask);
661 result = ib_cm_listen(ctx->cm_id, cmd.service_id, cmd.service_mask,
668 static ssize_t ib_ucm_notify(struct ib_ucm_file *file,
669 const char __user *inbuf,
670 int in_len, int out_len)
672 struct ib_ucm_notify cmd;
673 struct ib_ucm_context *ctx;
676 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
679 ctx = ib_ucm_ctx_get(file, cmd.id);
683 result = ib_cm_notify(ctx->cm_id, (enum ib_event_type) cmd.event);
688 static int ib_ucm_alloc_data(const void **dest, u64 src, u32 len)
697 data = memdup_user((void __user *)(unsigned long)src, len);
699 return PTR_ERR(data);
705 static int ib_ucm_path_get(struct ib_sa_path_rec **path, u64 src)
707 struct ib_user_path_rec upath;
708 struct ib_sa_path_rec *sa_path;
715 sa_path = kmalloc(sizeof(*sa_path), GFP_KERNEL);
719 if (copy_from_user(&upath, (void __user *)(unsigned long)src,
726 ib_copy_path_rec_from_user(sa_path, &upath);
731 static ssize_t ib_ucm_send_req(struct ib_ucm_file *file,
732 const char __user *inbuf,
733 int in_len, int out_len)
735 struct ib_cm_req_param param;
736 struct ib_ucm_context *ctx;
737 struct ib_ucm_req cmd;
740 param.private_data = NULL;
741 param.primary_path = NULL;
742 param.alternate_path = NULL;
744 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
747 result = ib_ucm_alloc_data(¶m.private_data, cmd.data, cmd.len);
751 result = ib_ucm_path_get(¶m.primary_path, cmd.primary_path);
755 result = ib_ucm_path_get(¶m.alternate_path, cmd.alternate_path);
759 param.private_data_len = cmd.len;
760 param.service_id = cmd.sid;
761 param.qp_num = cmd.qpn;
762 param.qp_type = cmd.qp_type;
763 param.starting_psn = cmd.psn;
764 param.peer_to_peer = cmd.peer_to_peer;
765 param.responder_resources = cmd.responder_resources;
766 param.initiator_depth = cmd.initiator_depth;
767 param.remote_cm_response_timeout = cmd.remote_cm_response_timeout;
768 param.flow_control = cmd.flow_control;
769 param.local_cm_response_timeout = cmd.local_cm_response_timeout;
770 param.retry_count = cmd.retry_count;
771 param.rnr_retry_count = cmd.rnr_retry_count;
772 param.max_cm_retries = cmd.max_cm_retries;
775 ctx = ib_ucm_ctx_get(file, cmd.id);
777 result = ib_send_cm_req(ctx->cm_id, ¶m);
780 result = PTR_ERR(ctx);
783 kfree(param.private_data);
784 kfree(param.primary_path);
785 kfree(param.alternate_path);
789 static ssize_t ib_ucm_send_rep(struct ib_ucm_file *file,
790 const char __user *inbuf,
791 int in_len, int out_len)
793 struct ib_cm_rep_param param;
794 struct ib_ucm_context *ctx;
795 struct ib_ucm_rep cmd;
798 param.private_data = NULL;
800 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
803 result = ib_ucm_alloc_data(¶m.private_data, cmd.data, cmd.len);
807 param.qp_num = cmd.qpn;
808 param.starting_psn = cmd.psn;
809 param.private_data_len = cmd.len;
810 param.responder_resources = cmd.responder_resources;
811 param.initiator_depth = cmd.initiator_depth;
812 param.failover_accepted = cmd.failover_accepted;
813 param.flow_control = cmd.flow_control;
814 param.rnr_retry_count = cmd.rnr_retry_count;
817 ctx = ib_ucm_ctx_get(file, cmd.id);
820 result = ib_send_cm_rep(ctx->cm_id, ¶m);
823 result = PTR_ERR(ctx);
825 kfree(param.private_data);
829 static ssize_t ib_ucm_send_private_data(struct ib_ucm_file *file,
830 const char __user *inbuf, int in_len,
831 int (*func)(struct ib_cm_id *cm_id,
832 const void *private_data,
833 u8 private_data_len))
835 struct ib_ucm_private_data cmd;
836 struct ib_ucm_context *ctx;
837 const void *private_data = NULL;
840 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
843 result = ib_ucm_alloc_data(&private_data, cmd.data, cmd.len);
847 ctx = ib_ucm_ctx_get(file, cmd.id);
849 result = func(ctx->cm_id, private_data, cmd.len);
852 result = PTR_ERR(ctx);
858 static ssize_t ib_ucm_send_rtu(struct ib_ucm_file *file,
859 const char __user *inbuf,
860 int in_len, int out_len)
862 return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_rtu);
865 static ssize_t ib_ucm_send_dreq(struct ib_ucm_file *file,
866 const char __user *inbuf,
867 int in_len, int out_len)
869 return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_dreq);
872 static ssize_t ib_ucm_send_drep(struct ib_ucm_file *file,
873 const char __user *inbuf,
874 int in_len, int out_len)
876 return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_drep);
879 static ssize_t ib_ucm_send_info(struct ib_ucm_file *file,
880 const char __user *inbuf, int in_len,
881 int (*func)(struct ib_cm_id *cm_id,
888 struct ib_ucm_context *ctx;
889 struct ib_ucm_info cmd;
890 const void *data = NULL;
891 const void *info = NULL;
894 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
897 result = ib_ucm_alloc_data(&data, cmd.data, cmd.data_len);
901 result = ib_ucm_alloc_data(&info, cmd.info, cmd.info_len);
905 ctx = ib_ucm_ctx_get(file, cmd.id);
907 result = func(ctx->cm_id, cmd.status, info, cmd.info_len,
911 result = PTR_ERR(ctx);
919 static ssize_t ib_ucm_send_rej(struct ib_ucm_file *file,
920 const char __user *inbuf,
921 int in_len, int out_len)
923 return ib_ucm_send_info(file, inbuf, in_len, (void *)ib_send_cm_rej);
926 static ssize_t ib_ucm_send_apr(struct ib_ucm_file *file,
927 const char __user *inbuf,
928 int in_len, int out_len)
930 return ib_ucm_send_info(file, inbuf, in_len, (void *)ib_send_cm_apr);
933 static ssize_t ib_ucm_send_mra(struct ib_ucm_file *file,
934 const char __user *inbuf,
935 int in_len, int out_len)
937 struct ib_ucm_context *ctx;
938 struct ib_ucm_mra cmd;
939 const void *data = NULL;
942 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
945 result = ib_ucm_alloc_data(&data, cmd.data, cmd.len);
949 ctx = ib_ucm_ctx_get(file, cmd.id);
951 result = ib_send_cm_mra(ctx->cm_id, cmd.timeout, data, cmd.len);
954 result = PTR_ERR(ctx);
960 static ssize_t ib_ucm_send_lap(struct ib_ucm_file *file,
961 const char __user *inbuf,
962 int in_len, int out_len)
964 struct ib_ucm_context *ctx;
965 struct ib_sa_path_rec *path = NULL;
966 struct ib_ucm_lap cmd;
967 const void *data = NULL;
970 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
973 result = ib_ucm_alloc_data(&data, cmd.data, cmd.len);
977 result = ib_ucm_path_get(&path, cmd.path);
981 ctx = ib_ucm_ctx_get(file, cmd.id);
983 result = ib_send_cm_lap(ctx->cm_id, path, data, cmd.len);
986 result = PTR_ERR(ctx);
994 static ssize_t ib_ucm_send_sidr_req(struct ib_ucm_file *file,
995 const char __user *inbuf,
996 int in_len, int out_len)
998 struct ib_cm_sidr_req_param param;
999 struct ib_ucm_context *ctx;
1000 struct ib_ucm_sidr_req cmd;
1003 param.private_data = NULL;
1006 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1009 result = ib_ucm_alloc_data(¶m.private_data, cmd.data, cmd.len);
1013 result = ib_ucm_path_get(¶m.path, cmd.path);
1017 param.private_data_len = cmd.len;
1018 param.service_id = cmd.sid;
1019 param.timeout_ms = cmd.timeout;
1020 param.max_cm_retries = cmd.max_cm_retries;
1022 ctx = ib_ucm_ctx_get(file, cmd.id);
1024 result = ib_send_cm_sidr_req(ctx->cm_id, ¶m);
1025 ib_ucm_ctx_put(ctx);
1027 result = PTR_ERR(ctx);
1030 kfree(param.private_data);
1035 static ssize_t ib_ucm_send_sidr_rep(struct ib_ucm_file *file,
1036 const char __user *inbuf,
1037 int in_len, int out_len)
1039 struct ib_cm_sidr_rep_param param;
1040 struct ib_ucm_sidr_rep cmd;
1041 struct ib_ucm_context *ctx;
1046 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1049 result = ib_ucm_alloc_data(¶m.private_data,
1050 cmd.data, cmd.data_len);
1054 result = ib_ucm_alloc_data(¶m.info, cmd.info, cmd.info_len);
1058 param.qp_num = cmd.qpn;
1059 param.qkey = cmd.qkey;
1060 param.status = cmd.status;
1061 param.info_length = cmd.info_len;
1062 param.private_data_len = cmd.data_len;
1064 ctx = ib_ucm_ctx_get(file, cmd.id);
1066 result = ib_send_cm_sidr_rep(ctx->cm_id, ¶m);
1067 ib_ucm_ctx_put(ctx);
1069 result = PTR_ERR(ctx);
1072 kfree(param.private_data);
1077 static ssize_t (*ucm_cmd_table[])(struct ib_ucm_file *file,
1078 const char __user *inbuf,
1079 int in_len, int out_len) = {
1080 [IB_USER_CM_CMD_CREATE_ID] = ib_ucm_create_id,
1081 [IB_USER_CM_CMD_DESTROY_ID] = ib_ucm_destroy_id,
1082 [IB_USER_CM_CMD_ATTR_ID] = ib_ucm_attr_id,
1083 [IB_USER_CM_CMD_LISTEN] = ib_ucm_listen,
1084 [IB_USER_CM_CMD_NOTIFY] = ib_ucm_notify,
1085 [IB_USER_CM_CMD_SEND_REQ] = ib_ucm_send_req,
1086 [IB_USER_CM_CMD_SEND_REP] = ib_ucm_send_rep,
1087 [IB_USER_CM_CMD_SEND_RTU] = ib_ucm_send_rtu,
1088 [IB_USER_CM_CMD_SEND_DREQ] = ib_ucm_send_dreq,
1089 [IB_USER_CM_CMD_SEND_DREP] = ib_ucm_send_drep,
1090 [IB_USER_CM_CMD_SEND_REJ] = ib_ucm_send_rej,
1091 [IB_USER_CM_CMD_SEND_MRA] = ib_ucm_send_mra,
1092 [IB_USER_CM_CMD_SEND_LAP] = ib_ucm_send_lap,
1093 [IB_USER_CM_CMD_SEND_APR] = ib_ucm_send_apr,
1094 [IB_USER_CM_CMD_SEND_SIDR_REQ] = ib_ucm_send_sidr_req,
1095 [IB_USER_CM_CMD_SEND_SIDR_REP] = ib_ucm_send_sidr_rep,
1096 [IB_USER_CM_CMD_EVENT] = ib_ucm_event,
1097 [IB_USER_CM_CMD_INIT_QP_ATTR] = ib_ucm_init_qp_attr,
1100 static ssize_t ib_ucm_write(struct file *filp, const char __user *buf,
1101 size_t len, loff_t *pos)
1103 struct ib_ucm_file *file = filp->private_data;
1104 struct ib_ucm_cmd_hdr hdr;
1107 if (len < sizeof(hdr))
1110 if (copy_from_user(&hdr, buf, sizeof(hdr)))
1113 if (hdr.cmd >= ARRAY_SIZE(ucm_cmd_table))
1116 if (hdr.in + sizeof(hdr) > len)
1119 result = ucm_cmd_table[hdr.cmd](file, buf + sizeof(hdr),
1127 static unsigned int ib_ucm_poll(struct file *filp,
1128 struct poll_table_struct *wait)
1130 struct ib_ucm_file *file = filp->private_data;
1131 unsigned int mask = 0;
1133 poll_wait(filp, &file->poll_wait, wait);
1135 if (!list_empty(&file->events))
1136 mask = POLLIN | POLLRDNORM;
1142 * ib_ucm_open() does not need the BKL:
1144 * - no global state is referred to;
1145 * - there is no ioctl method to race against;
1146 * - no further module initialization is required for open to work
1147 * after the device is registered.
1149 static int ib_ucm_open(struct inode *inode, struct file *filp)
1151 struct ib_ucm_file *file;
1153 file = kmalloc(sizeof(*file), GFP_KERNEL);
1157 INIT_LIST_HEAD(&file->events);
1158 INIT_LIST_HEAD(&file->ctxs);
1159 init_waitqueue_head(&file->poll_wait);
1161 mutex_init(&file->file_mutex);
1163 filp->private_data = file;
1165 file->device = container_of(inode->i_cdev, struct ib_ucm_device, cdev);
1167 return nonseekable_open(inode, filp);
1170 static int ib_ucm_close(struct inode *inode, struct file *filp)
1172 struct ib_ucm_file *file = filp->private_data;
1173 struct ib_ucm_context *ctx;
1175 mutex_lock(&file->file_mutex);
1176 while (!list_empty(&file->ctxs)) {
1177 ctx = list_entry(file->ctxs.next,
1178 struct ib_ucm_context, file_list);
1179 mutex_unlock(&file->file_mutex);
1181 mutex_lock(&ctx_id_mutex);
1182 idr_remove(&ctx_id_table, ctx->id);
1183 mutex_unlock(&ctx_id_mutex);
1185 ib_destroy_cm_id(ctx->cm_id);
1186 ib_ucm_cleanup_events(ctx);
1189 mutex_lock(&file->file_mutex);
1191 mutex_unlock(&file->file_mutex);
1196 static void ib_ucm_release_dev(struct device *dev)
1198 struct ib_ucm_device *ucm_dev;
1200 ucm_dev = container_of(dev, struct ib_ucm_device, dev);
1201 cdev_del(&ucm_dev->cdev);
1202 if (ucm_dev->devnum < IB_UCM_MAX_DEVICES)
1203 clear_bit(ucm_dev->devnum, dev_map);
1205 clear_bit(ucm_dev->devnum - IB_UCM_MAX_DEVICES, dev_map);
1209 static const struct file_operations ucm_fops = {
1210 .owner = THIS_MODULE,
1211 .open = ib_ucm_open,
1212 .release = ib_ucm_close,
1213 .write = ib_ucm_write,
1214 .poll = ib_ucm_poll,
1215 .llseek = no_llseek,
1218 static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
1221 struct ib_ucm_device *ucm_dev;
1223 ucm_dev = container_of(dev, struct ib_ucm_device, dev);
1224 return sprintf(buf, "%s\n", ucm_dev->ib_dev->name);
1226 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1228 static dev_t overflow_maj;
1229 static DECLARE_BITMAP(overflow_map, IB_UCM_MAX_DEVICES);
1230 static int find_overflow_devnum(void)
1234 if (!overflow_maj) {
1235 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UCM_MAX_DEVICES,
1238 printk(KERN_ERR "ucm: couldn't register dynamic device number\n");
1243 ret = find_first_zero_bit(overflow_map, IB_UCM_MAX_DEVICES);
1244 if (ret >= IB_UCM_MAX_DEVICES)
1250 static void ib_ucm_add_one(struct ib_device *device)
1254 struct ib_ucm_device *ucm_dev;
1256 if (!device->alloc_ucontext ||
1257 rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1260 ucm_dev = kzalloc(sizeof *ucm_dev, GFP_KERNEL);
1264 ucm_dev->ib_dev = device;
1266 devnum = find_first_zero_bit(dev_map, IB_UCM_MAX_DEVICES);
1267 if (devnum >= IB_UCM_MAX_DEVICES) {
1268 devnum = find_overflow_devnum();
1272 ucm_dev->devnum = devnum + IB_UCM_MAX_DEVICES;
1273 base = devnum + overflow_maj;
1274 set_bit(devnum, overflow_map);
1276 ucm_dev->devnum = devnum;
1277 base = devnum + IB_UCM_BASE_DEV;
1278 set_bit(devnum, dev_map);
1281 cdev_init(&ucm_dev->cdev, &ucm_fops);
1282 ucm_dev->cdev.owner = THIS_MODULE;
1283 kobject_set_name(&ucm_dev->cdev.kobj, "ucm%d", ucm_dev->devnum);
1284 if (cdev_add(&ucm_dev->cdev, base, 1))
1287 ucm_dev->dev.class = &cm_class;
1288 ucm_dev->dev.parent = device->dma_device;
1289 ucm_dev->dev.devt = ucm_dev->cdev.dev;
1290 ucm_dev->dev.release = ib_ucm_release_dev;
1291 dev_set_name(&ucm_dev->dev, "ucm%d", ucm_dev->devnum);
1292 if (device_register(&ucm_dev->dev))
1295 if (device_create_file(&ucm_dev->dev, &dev_attr_ibdev))
1298 ib_set_client_data(device, &ucm_client, ucm_dev);
1302 device_unregister(&ucm_dev->dev);
1304 cdev_del(&ucm_dev->cdev);
1305 if (ucm_dev->devnum < IB_UCM_MAX_DEVICES)
1306 clear_bit(devnum, dev_map);
1308 clear_bit(devnum, overflow_map);
1314 static void ib_ucm_remove_one(struct ib_device *device)
1316 struct ib_ucm_device *ucm_dev = ib_get_client_data(device, &ucm_client);
1321 device_unregister(&ucm_dev->dev);
1324 static CLASS_ATTR_STRING(abi_version, S_IRUGO,
1325 __stringify(IB_USER_CM_ABI_VERSION));
1327 static int __init ib_ucm_init(void)
1331 ret = register_chrdev_region(IB_UCM_BASE_DEV, IB_UCM_MAX_DEVICES,
1334 printk(KERN_ERR "ucm: couldn't register device number\n");
1338 ret = class_create_file(&cm_class, &class_attr_abi_version.attr);
1340 printk(KERN_ERR "ucm: couldn't create abi_version attribute\n");
1344 ret = ib_register_client(&ucm_client);
1346 printk(KERN_ERR "ucm: couldn't register client\n");
1352 class_remove_file(&cm_class, &class_attr_abi_version.attr);
1354 unregister_chrdev_region(IB_UCM_BASE_DEV, IB_UCM_MAX_DEVICES);
1359 static void __exit ib_ucm_cleanup(void)
1361 ib_unregister_client(&ucm_client);
1362 class_remove_file(&cm_class, &class_attr_abi_version.attr);
1363 unregister_chrdev_region(IB_UCM_BASE_DEV, IB_UCM_MAX_DEVICES);
1365 unregister_chrdev_region(overflow_maj, IB_UCM_MAX_DEVICES);
1366 idr_destroy(&ctx_id_table);
1369 module_init(ib_ucm_init);
1370 module_exit(ib_ucm_cleanup);