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 /* ib_cm and ib_user_cm modules share /sys/class/infiniband_cm */
110 extern struct class cm_class;
112 #define IB_UCM_BASE_DEV MKDEV(IB_UCM_MAJOR, IB_UCM_BASE_MINOR)
114 static void ib_ucm_add_one(struct ib_device *device);
115 static void ib_ucm_remove_one(struct ib_device *device);
117 static struct ib_client ucm_client = {
119 .add = ib_ucm_add_one,
120 .remove = ib_ucm_remove_one
123 static DEFINE_MUTEX(ctx_id_mutex);
124 static DEFINE_IDR(ctx_id_table);
125 static DECLARE_BITMAP(dev_map, IB_UCM_MAX_DEVICES);
127 static struct ib_ucm_context *ib_ucm_ctx_get(struct ib_ucm_file *file, int id)
129 struct ib_ucm_context *ctx;
131 mutex_lock(&ctx_id_mutex);
132 ctx = idr_find(&ctx_id_table, id);
134 ctx = ERR_PTR(-ENOENT);
135 else if (ctx->file != file)
136 ctx = ERR_PTR(-EINVAL);
138 atomic_inc(&ctx->ref);
139 mutex_unlock(&ctx_id_mutex);
144 static void ib_ucm_ctx_put(struct ib_ucm_context *ctx)
146 if (atomic_dec_and_test(&ctx->ref))
147 complete(&ctx->comp);
150 static inline int ib_ucm_new_cm_id(int event)
152 return event == IB_CM_REQ_RECEIVED || event == IB_CM_SIDR_REQ_RECEIVED;
155 static void ib_ucm_cleanup_events(struct ib_ucm_context *ctx)
157 struct ib_ucm_event *uevent;
159 mutex_lock(&ctx->file->file_mutex);
160 list_del(&ctx->file_list);
161 while (!list_empty(&ctx->events)) {
163 uevent = list_entry(ctx->events.next,
164 struct ib_ucm_event, ctx_list);
165 list_del(&uevent->file_list);
166 list_del(&uevent->ctx_list);
167 mutex_unlock(&ctx->file->file_mutex);
169 /* clear incoming connections. */
170 if (ib_ucm_new_cm_id(uevent->resp.event))
171 ib_destroy_cm_id(uevent->cm_id);
174 mutex_lock(&ctx->file->file_mutex);
176 mutex_unlock(&ctx->file->file_mutex);
179 static struct ib_ucm_context *ib_ucm_ctx_alloc(struct ib_ucm_file *file)
181 struct ib_ucm_context *ctx;
184 ctx = kzalloc(sizeof *ctx, GFP_KERNEL);
188 atomic_set(&ctx->ref, 1);
189 init_completion(&ctx->comp);
191 INIT_LIST_HEAD(&ctx->events);
194 result = idr_pre_get(&ctx_id_table, GFP_KERNEL);
198 mutex_lock(&ctx_id_mutex);
199 result = idr_get_new(&ctx_id_table, ctx, &ctx->id);
200 mutex_unlock(&ctx_id_mutex);
201 } while (result == -EAGAIN);
206 list_add_tail(&ctx->file_list, &file->ctxs);
214 static void ib_ucm_event_req_get(struct ib_ucm_req_event_resp *ureq,
215 struct ib_cm_req_event_param *kreq)
217 ureq->remote_ca_guid = kreq->remote_ca_guid;
218 ureq->remote_qkey = kreq->remote_qkey;
219 ureq->remote_qpn = kreq->remote_qpn;
220 ureq->qp_type = kreq->qp_type;
221 ureq->starting_psn = kreq->starting_psn;
222 ureq->responder_resources = kreq->responder_resources;
223 ureq->initiator_depth = kreq->initiator_depth;
224 ureq->local_cm_response_timeout = kreq->local_cm_response_timeout;
225 ureq->flow_control = kreq->flow_control;
226 ureq->remote_cm_response_timeout = kreq->remote_cm_response_timeout;
227 ureq->retry_count = kreq->retry_count;
228 ureq->rnr_retry_count = kreq->rnr_retry_count;
229 ureq->srq = kreq->srq;
230 ureq->port = kreq->port;
232 ib_copy_path_rec_to_user(&ureq->primary_path, kreq->primary_path);
233 if (kreq->alternate_path)
234 ib_copy_path_rec_to_user(&ureq->alternate_path,
235 kreq->alternate_path);
238 static void ib_ucm_event_rep_get(struct ib_ucm_rep_event_resp *urep,
239 struct ib_cm_rep_event_param *krep)
241 urep->remote_ca_guid = krep->remote_ca_guid;
242 urep->remote_qkey = krep->remote_qkey;
243 urep->remote_qpn = krep->remote_qpn;
244 urep->starting_psn = krep->starting_psn;
245 urep->responder_resources = krep->responder_resources;
246 urep->initiator_depth = krep->initiator_depth;
247 urep->target_ack_delay = krep->target_ack_delay;
248 urep->failover_accepted = krep->failover_accepted;
249 urep->flow_control = krep->flow_control;
250 urep->rnr_retry_count = krep->rnr_retry_count;
251 urep->srq = krep->srq;
254 static void ib_ucm_event_sidr_rep_get(struct ib_ucm_sidr_rep_event_resp *urep,
255 struct ib_cm_sidr_rep_event_param *krep)
257 urep->status = krep->status;
258 urep->qkey = krep->qkey;
259 urep->qpn = krep->qpn;
262 static int ib_ucm_event_process(struct ib_cm_event *evt,
263 struct ib_ucm_event *uvt)
267 switch (evt->event) {
268 case IB_CM_REQ_RECEIVED:
269 ib_ucm_event_req_get(&uvt->resp.u.req_resp,
270 &evt->param.req_rcvd);
271 uvt->data_len = IB_CM_REQ_PRIVATE_DATA_SIZE;
272 uvt->resp.present = IB_UCM_PRES_PRIMARY;
273 uvt->resp.present |= (evt->param.req_rcvd.alternate_path ?
274 IB_UCM_PRES_ALTERNATE : 0);
276 case IB_CM_REP_RECEIVED:
277 ib_ucm_event_rep_get(&uvt->resp.u.rep_resp,
278 &evt->param.rep_rcvd);
279 uvt->data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
281 case IB_CM_RTU_RECEIVED:
282 uvt->data_len = IB_CM_RTU_PRIVATE_DATA_SIZE;
283 uvt->resp.u.send_status = evt->param.send_status;
285 case IB_CM_DREQ_RECEIVED:
286 uvt->data_len = IB_CM_DREQ_PRIVATE_DATA_SIZE;
287 uvt->resp.u.send_status = evt->param.send_status;
289 case IB_CM_DREP_RECEIVED:
290 uvt->data_len = IB_CM_DREP_PRIVATE_DATA_SIZE;
291 uvt->resp.u.send_status = evt->param.send_status;
293 case IB_CM_MRA_RECEIVED:
294 uvt->resp.u.mra_resp.timeout =
295 evt->param.mra_rcvd.service_timeout;
296 uvt->data_len = IB_CM_MRA_PRIVATE_DATA_SIZE;
298 case IB_CM_REJ_RECEIVED:
299 uvt->resp.u.rej_resp.reason = evt->param.rej_rcvd.reason;
300 uvt->data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
301 uvt->info_len = evt->param.rej_rcvd.ari_length;
302 info = evt->param.rej_rcvd.ari;
304 case IB_CM_LAP_RECEIVED:
305 ib_copy_path_rec_to_user(&uvt->resp.u.lap_resp.path,
306 evt->param.lap_rcvd.alternate_path);
307 uvt->data_len = IB_CM_LAP_PRIVATE_DATA_SIZE;
308 uvt->resp.present = IB_UCM_PRES_ALTERNATE;
310 case IB_CM_APR_RECEIVED:
311 uvt->resp.u.apr_resp.status = evt->param.apr_rcvd.ap_status;
312 uvt->data_len = IB_CM_APR_PRIVATE_DATA_SIZE;
313 uvt->info_len = evt->param.apr_rcvd.info_len;
314 info = evt->param.apr_rcvd.apr_info;
316 case IB_CM_SIDR_REQ_RECEIVED:
317 uvt->resp.u.sidr_req_resp.pkey =
318 evt->param.sidr_req_rcvd.pkey;
319 uvt->resp.u.sidr_req_resp.port =
320 evt->param.sidr_req_rcvd.port;
321 uvt->data_len = IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE;
323 case IB_CM_SIDR_REP_RECEIVED:
324 ib_ucm_event_sidr_rep_get(&uvt->resp.u.sidr_rep_resp,
325 &evt->param.sidr_rep_rcvd);
326 uvt->data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
327 uvt->info_len = evt->param.sidr_rep_rcvd.info_len;
328 info = evt->param.sidr_rep_rcvd.info;
331 uvt->resp.u.send_status = evt->param.send_status;
336 uvt->data = kmemdup(evt->private_data, uvt->data_len, GFP_KERNEL);
340 uvt->resp.present |= IB_UCM_PRES_DATA;
344 uvt->info = kmemdup(info, uvt->info_len, GFP_KERNEL);
348 uvt->resp.present |= IB_UCM_PRES_INFO;
358 static int ib_ucm_event_handler(struct ib_cm_id *cm_id,
359 struct ib_cm_event *event)
361 struct ib_ucm_event *uevent;
362 struct ib_ucm_context *ctx;
365 ctx = cm_id->context;
367 uevent = kzalloc(sizeof *uevent, GFP_KERNEL);
372 uevent->cm_id = cm_id;
373 uevent->resp.uid = ctx->uid;
374 uevent->resp.id = ctx->id;
375 uevent->resp.event = event->event;
377 result = ib_ucm_event_process(event, uevent);
381 mutex_lock(&ctx->file->file_mutex);
382 list_add_tail(&uevent->file_list, &ctx->file->events);
383 list_add_tail(&uevent->ctx_list, &ctx->events);
384 wake_up_interruptible(&ctx->file->poll_wait);
385 mutex_unlock(&ctx->file->file_mutex);
391 /* Destroy new cm_id's */
392 return ib_ucm_new_cm_id(event->event);
395 static ssize_t ib_ucm_event(struct ib_ucm_file *file,
396 const char __user *inbuf,
397 int in_len, int out_len)
399 struct ib_ucm_context *ctx;
400 struct ib_ucm_event_get cmd;
401 struct ib_ucm_event *uevent;
405 if (out_len < sizeof(struct ib_ucm_event_resp))
408 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
411 mutex_lock(&file->file_mutex);
412 while (list_empty(&file->events)) {
413 mutex_unlock(&file->file_mutex);
415 if (file->filp->f_flags & O_NONBLOCK)
418 if (wait_event_interruptible(file->poll_wait,
419 !list_empty(&file->events)))
422 mutex_lock(&file->file_mutex);
425 uevent = list_entry(file->events.next, struct ib_ucm_event, file_list);
427 if (ib_ucm_new_cm_id(uevent->resp.event)) {
428 ctx = ib_ucm_ctx_alloc(file);
434 ctx->cm_id = uevent->cm_id;
435 ctx->cm_id->context = ctx;
436 uevent->resp.id = ctx->id;
439 if (copy_to_user((void __user *)(unsigned long)cmd.response,
440 &uevent->resp, sizeof(uevent->resp))) {
446 if (cmd.data_len < uevent->data_len) {
450 if (copy_to_user((void __user *)(unsigned long)cmd.data,
451 uevent->data, uevent->data_len)) {
458 if (cmd.info_len < uevent->info_len) {
462 if (copy_to_user((void __user *)(unsigned long)cmd.info,
463 uevent->info, uevent->info_len)) {
469 list_del(&uevent->file_list);
470 list_del(&uevent->ctx_list);
471 uevent->ctx->events_reported++;
477 mutex_unlock(&file->file_mutex);
481 static ssize_t ib_ucm_create_id(struct ib_ucm_file *file,
482 const char __user *inbuf,
483 int in_len, int out_len)
485 struct ib_ucm_create_id cmd;
486 struct ib_ucm_create_id_resp resp;
487 struct ib_ucm_context *ctx;
490 if (out_len < sizeof(resp))
493 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
496 mutex_lock(&file->file_mutex);
497 ctx = ib_ucm_ctx_alloc(file);
498 mutex_unlock(&file->file_mutex);
503 ctx->cm_id = ib_create_cm_id(file->device->ib_dev,
504 ib_ucm_event_handler, ctx);
505 if (IS_ERR(ctx->cm_id)) {
506 result = PTR_ERR(ctx->cm_id);
511 if (copy_to_user((void __user *)(unsigned long)cmd.response,
512 &resp, sizeof(resp))) {
519 ib_destroy_cm_id(ctx->cm_id);
521 mutex_lock(&ctx_id_mutex);
522 idr_remove(&ctx_id_table, ctx->id);
523 mutex_unlock(&ctx_id_mutex);
528 static ssize_t ib_ucm_destroy_id(struct ib_ucm_file *file,
529 const char __user *inbuf,
530 int in_len, int out_len)
532 struct ib_ucm_destroy_id cmd;
533 struct ib_ucm_destroy_id_resp resp;
534 struct ib_ucm_context *ctx;
537 if (out_len < sizeof(resp))
540 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
543 mutex_lock(&ctx_id_mutex);
544 ctx = idr_find(&ctx_id_table, cmd.id);
546 ctx = ERR_PTR(-ENOENT);
547 else if (ctx->file != file)
548 ctx = ERR_PTR(-EINVAL);
550 idr_remove(&ctx_id_table, ctx->id);
551 mutex_unlock(&ctx_id_mutex);
557 wait_for_completion(&ctx->comp);
559 /* No new events will be generated after destroying the cm_id. */
560 ib_destroy_cm_id(ctx->cm_id);
561 /* Cleanup events not yet reported to the user. */
562 ib_ucm_cleanup_events(ctx);
564 resp.events_reported = ctx->events_reported;
565 if (copy_to_user((void __user *)(unsigned long)cmd.response,
566 &resp, sizeof(resp)))
573 static ssize_t ib_ucm_attr_id(struct ib_ucm_file *file,
574 const char __user *inbuf,
575 int in_len, int out_len)
577 struct ib_ucm_attr_id_resp resp;
578 struct ib_ucm_attr_id cmd;
579 struct ib_ucm_context *ctx;
582 if (out_len < sizeof(resp))
585 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
588 ctx = ib_ucm_ctx_get(file, cmd.id);
592 resp.service_id = ctx->cm_id->service_id;
593 resp.service_mask = ctx->cm_id->service_mask;
594 resp.local_id = ctx->cm_id->local_id;
595 resp.remote_id = ctx->cm_id->remote_id;
597 if (copy_to_user((void __user *)(unsigned long)cmd.response,
598 &resp, sizeof(resp)))
605 static ssize_t ib_ucm_init_qp_attr(struct ib_ucm_file *file,
606 const char __user *inbuf,
607 int in_len, int out_len)
609 struct ib_uverbs_qp_attr resp;
610 struct ib_ucm_init_qp_attr cmd;
611 struct ib_ucm_context *ctx;
612 struct ib_qp_attr qp_attr;
615 if (out_len < sizeof(resp))
618 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
621 ctx = ib_ucm_ctx_get(file, cmd.id);
625 resp.qp_attr_mask = 0;
626 memset(&qp_attr, 0, sizeof qp_attr);
627 qp_attr.qp_state = cmd.qp_state;
628 result = ib_cm_init_qp_attr(ctx->cm_id, &qp_attr, &resp.qp_attr_mask);
632 ib_copy_qp_attr_to_user(&resp, &qp_attr);
634 if (copy_to_user((void __user *)(unsigned long)cmd.response,
635 &resp, sizeof(resp)))
643 static int ucm_validate_listen(__be64 service_id, __be64 service_mask)
645 service_id &= service_mask;
647 if (((service_id & IB_CMA_SERVICE_ID_MASK) == IB_CMA_SERVICE_ID) ||
648 ((service_id & IB_SDP_SERVICE_ID_MASK) == IB_SDP_SERVICE_ID))
654 static ssize_t ib_ucm_listen(struct ib_ucm_file *file,
655 const char __user *inbuf,
656 int in_len, int out_len)
658 struct ib_ucm_listen cmd;
659 struct ib_ucm_context *ctx;
662 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
665 ctx = ib_ucm_ctx_get(file, cmd.id);
669 result = ucm_validate_listen(cmd.service_id, cmd.service_mask);
673 result = ib_cm_listen(ctx->cm_id, cmd.service_id, cmd.service_mask,
680 static ssize_t ib_ucm_notify(struct ib_ucm_file *file,
681 const char __user *inbuf,
682 int in_len, int out_len)
684 struct ib_ucm_notify cmd;
685 struct ib_ucm_context *ctx;
688 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
691 ctx = ib_ucm_ctx_get(file, cmd.id);
695 result = ib_cm_notify(ctx->cm_id, (enum ib_event_type) cmd.event);
700 static int ib_ucm_alloc_data(const void **dest, u64 src, u32 len)
709 data = memdup_user((void __user *)(unsigned long)src, len);
711 return PTR_ERR(data);
717 static int ib_ucm_path_get(struct ib_sa_path_rec **path, u64 src)
719 struct ib_user_path_rec upath;
720 struct ib_sa_path_rec *sa_path;
727 sa_path = kmalloc(sizeof(*sa_path), GFP_KERNEL);
731 if (copy_from_user(&upath, (void __user *)(unsigned long)src,
738 ib_copy_path_rec_from_user(sa_path, &upath);
743 static ssize_t ib_ucm_send_req(struct ib_ucm_file *file,
744 const char __user *inbuf,
745 int in_len, int out_len)
747 struct ib_cm_req_param param;
748 struct ib_ucm_context *ctx;
749 struct ib_ucm_req cmd;
752 param.private_data = NULL;
753 param.primary_path = NULL;
754 param.alternate_path = NULL;
756 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
759 result = ib_ucm_alloc_data(¶m.private_data, cmd.data, cmd.len);
763 result = ib_ucm_path_get(¶m.primary_path, cmd.primary_path);
767 result = ib_ucm_path_get(¶m.alternate_path, cmd.alternate_path);
771 param.private_data_len = cmd.len;
772 param.service_id = cmd.sid;
773 param.qp_num = cmd.qpn;
774 param.qp_type = cmd.qp_type;
775 param.starting_psn = cmd.psn;
776 param.peer_to_peer = cmd.peer_to_peer;
777 param.responder_resources = cmd.responder_resources;
778 param.initiator_depth = cmd.initiator_depth;
779 param.remote_cm_response_timeout = cmd.remote_cm_response_timeout;
780 param.flow_control = cmd.flow_control;
781 param.local_cm_response_timeout = cmd.local_cm_response_timeout;
782 param.retry_count = cmd.retry_count;
783 param.rnr_retry_count = cmd.rnr_retry_count;
784 param.max_cm_retries = cmd.max_cm_retries;
787 ctx = ib_ucm_ctx_get(file, cmd.id);
789 result = ib_send_cm_req(ctx->cm_id, ¶m);
792 result = PTR_ERR(ctx);
795 kfree(param.private_data);
796 kfree(param.primary_path);
797 kfree(param.alternate_path);
801 static ssize_t ib_ucm_send_rep(struct ib_ucm_file *file,
802 const char __user *inbuf,
803 int in_len, int out_len)
805 struct ib_cm_rep_param param;
806 struct ib_ucm_context *ctx;
807 struct ib_ucm_rep cmd;
810 param.private_data = NULL;
812 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
815 result = ib_ucm_alloc_data(¶m.private_data, cmd.data, cmd.len);
819 param.qp_num = cmd.qpn;
820 param.starting_psn = cmd.psn;
821 param.private_data_len = cmd.len;
822 param.responder_resources = cmd.responder_resources;
823 param.initiator_depth = cmd.initiator_depth;
824 param.failover_accepted = cmd.failover_accepted;
825 param.flow_control = cmd.flow_control;
826 param.rnr_retry_count = cmd.rnr_retry_count;
829 ctx = ib_ucm_ctx_get(file, cmd.id);
832 result = ib_send_cm_rep(ctx->cm_id, ¶m);
835 result = PTR_ERR(ctx);
837 kfree(param.private_data);
841 static ssize_t ib_ucm_send_private_data(struct ib_ucm_file *file,
842 const char __user *inbuf, int in_len,
843 int (*func)(struct ib_cm_id *cm_id,
844 const void *private_data,
845 u8 private_data_len))
847 struct ib_ucm_private_data cmd;
848 struct ib_ucm_context *ctx;
849 const void *private_data = NULL;
852 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
855 result = ib_ucm_alloc_data(&private_data, cmd.data, cmd.len);
859 ctx = ib_ucm_ctx_get(file, cmd.id);
861 result = func(ctx->cm_id, private_data, cmd.len);
864 result = PTR_ERR(ctx);
870 static ssize_t ib_ucm_send_rtu(struct ib_ucm_file *file,
871 const char __user *inbuf,
872 int in_len, int out_len)
874 return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_rtu);
877 static ssize_t ib_ucm_send_dreq(struct ib_ucm_file *file,
878 const char __user *inbuf,
879 int in_len, int out_len)
881 return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_dreq);
884 static ssize_t ib_ucm_send_drep(struct ib_ucm_file *file,
885 const char __user *inbuf,
886 int in_len, int out_len)
888 return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_drep);
891 static ssize_t ib_ucm_send_info(struct ib_ucm_file *file,
892 const char __user *inbuf, int in_len,
893 int (*func)(struct ib_cm_id *cm_id,
900 struct ib_ucm_context *ctx;
901 struct ib_ucm_info cmd;
902 const void *data = NULL;
903 const void *info = NULL;
906 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
909 result = ib_ucm_alloc_data(&data, cmd.data, cmd.data_len);
913 result = ib_ucm_alloc_data(&info, cmd.info, cmd.info_len);
917 ctx = ib_ucm_ctx_get(file, cmd.id);
919 result = func(ctx->cm_id, cmd.status, info, cmd.info_len,
923 result = PTR_ERR(ctx);
931 static ssize_t ib_ucm_send_rej(struct ib_ucm_file *file,
932 const char __user *inbuf,
933 int in_len, int out_len)
935 return ib_ucm_send_info(file, inbuf, in_len, (void *)ib_send_cm_rej);
938 static ssize_t ib_ucm_send_apr(struct ib_ucm_file *file,
939 const char __user *inbuf,
940 int in_len, int out_len)
942 return ib_ucm_send_info(file, inbuf, in_len, (void *)ib_send_cm_apr);
945 static ssize_t ib_ucm_send_mra(struct ib_ucm_file *file,
946 const char __user *inbuf,
947 int in_len, int out_len)
949 struct ib_ucm_context *ctx;
950 struct ib_ucm_mra cmd;
951 const void *data = NULL;
954 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
957 result = ib_ucm_alloc_data(&data, cmd.data, cmd.len);
961 ctx = ib_ucm_ctx_get(file, cmd.id);
963 result = ib_send_cm_mra(ctx->cm_id, cmd.timeout, data, cmd.len);
966 result = PTR_ERR(ctx);
972 static ssize_t ib_ucm_send_lap(struct ib_ucm_file *file,
973 const char __user *inbuf,
974 int in_len, int out_len)
976 struct ib_ucm_context *ctx;
977 struct ib_sa_path_rec *path = NULL;
978 struct ib_ucm_lap cmd;
979 const void *data = NULL;
982 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
985 result = ib_ucm_alloc_data(&data, cmd.data, cmd.len);
989 result = ib_ucm_path_get(&path, cmd.path);
993 ctx = ib_ucm_ctx_get(file, cmd.id);
995 result = ib_send_cm_lap(ctx->cm_id, path, data, cmd.len);
998 result = PTR_ERR(ctx);
1006 static ssize_t ib_ucm_send_sidr_req(struct ib_ucm_file *file,
1007 const char __user *inbuf,
1008 int in_len, int out_len)
1010 struct ib_cm_sidr_req_param param;
1011 struct ib_ucm_context *ctx;
1012 struct ib_ucm_sidr_req cmd;
1015 param.private_data = NULL;
1018 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1021 result = ib_ucm_alloc_data(¶m.private_data, cmd.data, cmd.len);
1025 result = ib_ucm_path_get(¶m.path, cmd.path);
1029 param.private_data_len = cmd.len;
1030 param.service_id = cmd.sid;
1031 param.timeout_ms = cmd.timeout;
1032 param.max_cm_retries = cmd.max_cm_retries;
1034 ctx = ib_ucm_ctx_get(file, cmd.id);
1036 result = ib_send_cm_sidr_req(ctx->cm_id, ¶m);
1037 ib_ucm_ctx_put(ctx);
1039 result = PTR_ERR(ctx);
1042 kfree(param.private_data);
1047 static ssize_t ib_ucm_send_sidr_rep(struct ib_ucm_file *file,
1048 const char __user *inbuf,
1049 int in_len, int out_len)
1051 struct ib_cm_sidr_rep_param param;
1052 struct ib_ucm_sidr_rep cmd;
1053 struct ib_ucm_context *ctx;
1058 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1061 result = ib_ucm_alloc_data(¶m.private_data,
1062 cmd.data, cmd.data_len);
1066 result = ib_ucm_alloc_data(¶m.info, cmd.info, cmd.info_len);
1070 param.qp_num = cmd.qpn;
1071 param.qkey = cmd.qkey;
1072 param.status = cmd.status;
1073 param.info_length = cmd.info_len;
1074 param.private_data_len = cmd.data_len;
1076 ctx = ib_ucm_ctx_get(file, cmd.id);
1078 result = ib_send_cm_sidr_rep(ctx->cm_id, ¶m);
1079 ib_ucm_ctx_put(ctx);
1081 result = PTR_ERR(ctx);
1084 kfree(param.private_data);
1089 static ssize_t (*ucm_cmd_table[])(struct ib_ucm_file *file,
1090 const char __user *inbuf,
1091 int in_len, int out_len) = {
1092 [IB_USER_CM_CMD_CREATE_ID] = ib_ucm_create_id,
1093 [IB_USER_CM_CMD_DESTROY_ID] = ib_ucm_destroy_id,
1094 [IB_USER_CM_CMD_ATTR_ID] = ib_ucm_attr_id,
1095 [IB_USER_CM_CMD_LISTEN] = ib_ucm_listen,
1096 [IB_USER_CM_CMD_NOTIFY] = ib_ucm_notify,
1097 [IB_USER_CM_CMD_SEND_REQ] = ib_ucm_send_req,
1098 [IB_USER_CM_CMD_SEND_REP] = ib_ucm_send_rep,
1099 [IB_USER_CM_CMD_SEND_RTU] = ib_ucm_send_rtu,
1100 [IB_USER_CM_CMD_SEND_DREQ] = ib_ucm_send_dreq,
1101 [IB_USER_CM_CMD_SEND_DREP] = ib_ucm_send_drep,
1102 [IB_USER_CM_CMD_SEND_REJ] = ib_ucm_send_rej,
1103 [IB_USER_CM_CMD_SEND_MRA] = ib_ucm_send_mra,
1104 [IB_USER_CM_CMD_SEND_LAP] = ib_ucm_send_lap,
1105 [IB_USER_CM_CMD_SEND_APR] = ib_ucm_send_apr,
1106 [IB_USER_CM_CMD_SEND_SIDR_REQ] = ib_ucm_send_sidr_req,
1107 [IB_USER_CM_CMD_SEND_SIDR_REP] = ib_ucm_send_sidr_rep,
1108 [IB_USER_CM_CMD_EVENT] = ib_ucm_event,
1109 [IB_USER_CM_CMD_INIT_QP_ATTR] = ib_ucm_init_qp_attr,
1112 static ssize_t ib_ucm_write(struct file *filp, const char __user *buf,
1113 size_t len, loff_t *pos)
1115 struct ib_ucm_file *file = filp->private_data;
1116 struct ib_ucm_cmd_hdr hdr;
1119 if (len < sizeof(hdr))
1122 if (copy_from_user(&hdr, buf, sizeof(hdr)))
1125 if (hdr.cmd < 0 || hdr.cmd >= ARRAY_SIZE(ucm_cmd_table))
1128 if (hdr.in + sizeof(hdr) > len)
1131 result = ucm_cmd_table[hdr.cmd](file, buf + sizeof(hdr),
1139 static unsigned int ib_ucm_poll(struct file *filp,
1140 struct poll_table_struct *wait)
1142 struct ib_ucm_file *file = filp->private_data;
1143 unsigned int mask = 0;
1145 poll_wait(filp, &file->poll_wait, wait);
1147 if (!list_empty(&file->events))
1148 mask = POLLIN | POLLRDNORM;
1154 * ib_ucm_open() does not need the BKL:
1156 * - no global state is referred to;
1157 * - there is no ioctl method to race against;
1158 * - no further module initialization is required for open to work
1159 * after the device is registered.
1161 static int ib_ucm_open(struct inode *inode, struct file *filp)
1163 struct ib_ucm_file *file;
1165 file = kmalloc(sizeof(*file), GFP_KERNEL);
1169 INIT_LIST_HEAD(&file->events);
1170 INIT_LIST_HEAD(&file->ctxs);
1171 init_waitqueue_head(&file->poll_wait);
1173 mutex_init(&file->file_mutex);
1175 filp->private_data = file;
1177 file->device = container_of(inode->i_cdev, struct ib_ucm_device, cdev);
1179 return nonseekable_open(inode, filp);
1182 static int ib_ucm_close(struct inode *inode, struct file *filp)
1184 struct ib_ucm_file *file = filp->private_data;
1185 struct ib_ucm_context *ctx;
1187 mutex_lock(&file->file_mutex);
1188 while (!list_empty(&file->ctxs)) {
1189 ctx = list_entry(file->ctxs.next,
1190 struct ib_ucm_context, file_list);
1191 mutex_unlock(&file->file_mutex);
1193 mutex_lock(&ctx_id_mutex);
1194 idr_remove(&ctx_id_table, ctx->id);
1195 mutex_unlock(&ctx_id_mutex);
1197 ib_destroy_cm_id(ctx->cm_id);
1198 ib_ucm_cleanup_events(ctx);
1201 mutex_lock(&file->file_mutex);
1203 mutex_unlock(&file->file_mutex);
1208 static void ib_ucm_release_dev(struct device *dev)
1210 struct ib_ucm_device *ucm_dev;
1212 ucm_dev = container_of(dev, struct ib_ucm_device, dev);
1213 cdev_del(&ucm_dev->cdev);
1214 if (ucm_dev->devnum < IB_UCM_MAX_DEVICES)
1215 clear_bit(ucm_dev->devnum, dev_map);
1217 clear_bit(ucm_dev->devnum - IB_UCM_MAX_DEVICES, 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,
1227 .llseek = no_llseek,
1230 static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
1233 struct ib_ucm_device *ucm_dev;
1235 ucm_dev = container_of(dev, struct ib_ucm_device, dev);
1236 return sprintf(buf, "%s\n", ucm_dev->ib_dev->name);
1238 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1240 static dev_t overflow_maj;
1241 static DECLARE_BITMAP(overflow_map, IB_UCM_MAX_DEVICES);
1242 static int find_overflow_devnum(void)
1246 if (!overflow_maj) {
1247 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UCM_MAX_DEVICES,
1250 printk(KERN_ERR "ucm: couldn't register dynamic device number\n");
1255 ret = find_first_zero_bit(overflow_map, IB_UCM_MAX_DEVICES);
1256 if (ret >= IB_UCM_MAX_DEVICES)
1262 static void ib_ucm_add_one(struct ib_device *device)
1266 struct ib_ucm_device *ucm_dev;
1268 if (!device->alloc_ucontext ||
1269 rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1272 ucm_dev = kzalloc(sizeof *ucm_dev, GFP_KERNEL);
1276 ucm_dev->ib_dev = device;
1278 devnum = find_first_zero_bit(dev_map, IB_UCM_MAX_DEVICES);
1279 if (devnum >= IB_UCM_MAX_DEVICES) {
1280 devnum = find_overflow_devnum();
1284 ucm_dev->devnum = devnum + IB_UCM_MAX_DEVICES;
1285 base = devnum + overflow_maj;
1286 set_bit(devnum, overflow_map);
1288 ucm_dev->devnum = devnum;
1289 base = devnum + IB_UCM_BASE_DEV;
1290 set_bit(devnum, dev_map);
1293 cdev_init(&ucm_dev->cdev, &ucm_fops);
1294 ucm_dev->cdev.owner = THIS_MODULE;
1295 kobject_set_name(&ucm_dev->cdev.kobj, "ucm%d", ucm_dev->devnum);
1296 if (cdev_add(&ucm_dev->cdev, base, 1))
1299 ucm_dev->dev.class = &cm_class;
1300 ucm_dev->dev.parent = device->dma_device;
1301 ucm_dev->dev.devt = ucm_dev->cdev.dev;
1302 ucm_dev->dev.release = ib_ucm_release_dev;
1303 dev_set_name(&ucm_dev->dev, "ucm%d", ucm_dev->devnum);
1304 if (device_register(&ucm_dev->dev))
1307 if (device_create_file(&ucm_dev->dev, &dev_attr_ibdev))
1310 ib_set_client_data(device, &ucm_client, ucm_dev);
1314 device_unregister(&ucm_dev->dev);
1316 cdev_del(&ucm_dev->cdev);
1317 if (ucm_dev->devnum < IB_UCM_MAX_DEVICES)
1318 clear_bit(devnum, dev_map);
1320 clear_bit(devnum, overflow_map);
1326 static void ib_ucm_remove_one(struct ib_device *device)
1328 struct ib_ucm_device *ucm_dev = ib_get_client_data(device, &ucm_client);
1333 device_unregister(&ucm_dev->dev);
1336 static CLASS_ATTR_STRING(abi_version, S_IRUGO,
1337 __stringify(IB_USER_CM_ABI_VERSION));
1339 static int __init ib_ucm_init(void)
1343 ret = register_chrdev_region(IB_UCM_BASE_DEV, IB_UCM_MAX_DEVICES,
1346 printk(KERN_ERR "ucm: couldn't register device number\n");
1350 ret = class_create_file(&cm_class, &class_attr_abi_version.attr);
1352 printk(KERN_ERR "ucm: couldn't create abi_version attribute\n");
1356 ret = ib_register_client(&ucm_client);
1358 printk(KERN_ERR "ucm: couldn't register client\n");
1364 class_remove_file(&cm_class, &class_attr_abi_version.attr);
1366 unregister_chrdev_region(IB_UCM_BASE_DEV, IB_UCM_MAX_DEVICES);
1371 static void __exit ib_ucm_cleanup(void)
1373 ib_unregister_client(&ucm_client);
1374 class_remove_file(&cm_class, &class_attr_abi_version.attr);
1375 unregister_chrdev_region(IB_UCM_BASE_DEV, IB_UCM_MAX_DEVICES);
1377 unregister_chrdev_region(overflow_maj, IB_UCM_MAX_DEVICES);
1378 idr_destroy(&ctx_id_table);
1381 module_init(ib_ucm_init);
1382 module_exit(ib_ucm_cleanup);