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33#include <linux/completion.h>
34#include <linux/file.h>
35#include <linux/mutex.h>
36#include <linux/poll.h>
37#include <linux/idr.h>
38#include <linux/in.h>
39#include <linux/in6.h>
40#include <linux/miscdevice.h>
41
42#include <rdma/rdma_user_cm.h>
43#include <rdma/ib_marshall.h>
44#include <rdma/rdma_cm.h>
45
46MODULE_AUTHOR("Sean Hefty");
47MODULE_DESCRIPTION("RDMA Userspace Connection Manager Access");
48MODULE_LICENSE("Dual BSD/GPL");
49
50enum {
51 UCMA_MAX_BACKLOG = 128
52};
53
54struct ucma_file {
55 struct mutex mut;
56 struct file *filp;
57 struct list_head ctx_list;
58 struct list_head event_list;
59 wait_queue_head_t poll_wait;
60};
61
62struct ucma_context {
63 int id;
64 struct completion comp;
65 atomic_t ref;
66 int events_reported;
67 int backlog;
68
69 struct ucma_file *file;
70 struct rdma_cm_id *cm_id;
71 u64 uid;
72
73 struct list_head list;
74 struct list_head mc_list;
75};
76
77struct ucma_multicast {
78 struct ucma_context *ctx;
79 int id;
80 int events_reported;
81
82 u64 uid;
83 struct list_head list;
84 struct sockaddr_storage addr;
85};
86
87struct ucma_event {
88 struct ucma_context *ctx;
89 struct ucma_multicast *mc;
90 struct list_head list;
91 struct rdma_cm_id *cm_id;
92 struct rdma_ucm_event_resp resp;
93};
94
95static DEFINE_MUTEX(mut);
96static DEFINE_IDR(ctx_idr);
97static DEFINE_IDR(multicast_idr);
98
99static inline struct ucma_context *_ucma_find_context(int id,
100 struct ucma_file *file)
101{
102 struct ucma_context *ctx;
103
104 ctx = idr_find(&ctx_idr, id);
105 if (!ctx)
106 ctx = ERR_PTR(-ENOENT);
107 else if (ctx->file != file)
108 ctx = ERR_PTR(-EINVAL);
109 return ctx;
110}
111
112static struct ucma_context *ucma_get_ctx(struct ucma_file *file, int id)
113{
114 struct ucma_context *ctx;
115
116 mutex_lock(&mut);
117 ctx = _ucma_find_context(id, file);
118 if (!IS_ERR(ctx))
119 atomic_inc(&ctx->ref);
120 mutex_unlock(&mut);
121 return ctx;
122}
123
124static void ucma_put_ctx(struct ucma_context *ctx)
125{
126 if (atomic_dec_and_test(&ctx->ref))
127 complete(&ctx->comp);
128}
129
130static struct ucma_context *ucma_alloc_ctx(struct ucma_file *file)
131{
132 struct ucma_context *ctx;
133 int ret;
134
135 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
136 if (!ctx)
137 return NULL;
138
139 atomic_set(&ctx->ref, 1);
140 init_completion(&ctx->comp);
141 INIT_LIST_HEAD(&ctx->mc_list);
142 ctx->file = file;
143
144 do {
145 ret = idr_pre_get(&ctx_idr, GFP_KERNEL);
146 if (!ret)
147 goto error;
148
149 mutex_lock(&mut);
150 ret = idr_get_new(&ctx_idr, ctx, &ctx->id);
151 mutex_unlock(&mut);
152 } while (ret == -EAGAIN);
153
154 if (ret)
155 goto error;
156
157 list_add_tail(&ctx->list, &file->ctx_list);
158 return ctx;
159
160error:
161 kfree(ctx);
162 return NULL;
163}
164
165static struct ucma_multicast* ucma_alloc_multicast(struct ucma_context *ctx)
166{
167 struct ucma_multicast *mc;
168 int ret;
169
170 mc = kzalloc(sizeof(*mc), GFP_KERNEL);
171 if (!mc)
172 return NULL;
173
174 do {
175 ret = idr_pre_get(&multicast_idr, GFP_KERNEL);
176 if (!ret)
177 goto error;
178
179 mutex_lock(&mut);
180 ret = idr_get_new(&multicast_idr, mc, &mc->id);
181 mutex_unlock(&mut);
182 } while (ret == -EAGAIN);
183
184 if (ret)
185 goto error;
186
187 mc->ctx = ctx;
188 list_add_tail(&mc->list, &ctx->mc_list);
189 return mc;
190
191error:
192 kfree(mc);
193 return NULL;
194}
195
196static void ucma_copy_conn_event(struct rdma_ucm_conn_param *dst,
197 struct rdma_conn_param *src)
198{
199 if (src->private_data_len)
200 memcpy(dst->private_data, src->private_data,
201 src->private_data_len);
202 dst->private_data_len = src->private_data_len;
203 dst->responder_resources =src->responder_resources;
204 dst->initiator_depth = src->initiator_depth;
205 dst->flow_control = src->flow_control;
206 dst->retry_count = src->retry_count;
207 dst->rnr_retry_count = src->rnr_retry_count;
208 dst->srq = src->srq;
209 dst->qp_num = src->qp_num;
210}
211
212static void ucma_copy_ud_event(struct rdma_ucm_ud_param *dst,
213 struct rdma_ud_param *src)
214{
215 if (src->private_data_len)
216 memcpy(dst->private_data, src->private_data,
217 src->private_data_len);
218 dst->private_data_len = src->private_data_len;
219 ib_copy_ah_attr_to_user(&dst->ah_attr, &src->ah_attr);
220 dst->qp_num = src->qp_num;
221 dst->qkey = src->qkey;
222}
223
224static void ucma_set_event_context(struct ucma_context *ctx,
225 struct rdma_cm_event *event,
226 struct ucma_event *uevent)
227{
228 uevent->ctx = ctx;
229 switch (event->event) {
230 case RDMA_CM_EVENT_MULTICAST_JOIN:
231 case RDMA_CM_EVENT_MULTICAST_ERROR:
232 uevent->mc = (struct ucma_multicast *)
233 event->param.ud.private_data;
234 uevent->resp.uid = uevent->mc->uid;
235 uevent->resp.id = uevent->mc->id;
236 break;
237 default:
238 uevent->resp.uid = ctx->uid;
239 uevent->resp.id = ctx->id;
240 break;
241 }
242}
243
244static int ucma_event_handler(struct rdma_cm_id *cm_id,
245 struct rdma_cm_event *event)
246{
247 struct ucma_event *uevent;
248 struct ucma_context *ctx = cm_id->context;
249 int ret = 0;
250
251 uevent = kzalloc(sizeof(*uevent), GFP_KERNEL);
252 if (!uevent)
253 return event->event == RDMA_CM_EVENT_CONNECT_REQUEST;
254
255 uevent->cm_id = cm_id;
256 ucma_set_event_context(ctx, event, uevent);
257 uevent->resp.event = event->event;
258 uevent->resp.status = event->status;
259 if (cm_id->ps == RDMA_PS_UDP || cm_id->ps == RDMA_PS_IPOIB)
260 ucma_copy_ud_event(&uevent->resp.param.ud, &event->param.ud);
261 else
262 ucma_copy_conn_event(&uevent->resp.param.conn,
263 &event->param.conn);
264
265 mutex_lock(&ctx->file->mut);
266 if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST) {
267 if (!ctx->backlog) {
268 ret = -ENOMEM;
269 kfree(uevent);
270 goto out;
271 }
272 ctx->backlog--;
273 } else if (!ctx->uid) {
274
275
276
277
278
279
280 kfree(uevent);
281 goto out;
282 }
283
284 list_add_tail(&uevent->list, &ctx->file->event_list);
285 wake_up_interruptible(&ctx->file->poll_wait);
286out:
287 mutex_unlock(&ctx->file->mut);
288 return ret;
289}
290
291static ssize_t ucma_get_event(struct ucma_file *file, const char __user *inbuf,
292 int in_len, int out_len)
293{
294 struct ucma_context *ctx;
295 struct rdma_ucm_get_event cmd;
296 struct ucma_event *uevent;
297 int ret = 0;
298 DEFINE_WAIT(wait);
299
300 if (out_len < sizeof uevent->resp)
301 return -ENOSPC;
302
303 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
304 return -EFAULT;
305
306 mutex_lock(&file->mut);
307 while (list_empty(&file->event_list)) {
308 mutex_unlock(&file->mut);
309
310 if (file->filp->f_flags & O_NONBLOCK)
311 return -EAGAIN;
312
313 if (wait_event_interruptible(file->poll_wait,
314 !list_empty(&file->event_list)))
315 return -ERESTARTSYS;
316
317 mutex_lock(&file->mut);
318 }
319
320 uevent = list_entry(file->event_list.next, struct ucma_event, list);
321
322 if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST) {
323 ctx = ucma_alloc_ctx(file);
324 if (!ctx) {
325 ret = -ENOMEM;
326 goto done;
327 }
328 uevent->ctx->backlog++;
329 ctx->cm_id = uevent->cm_id;
330 ctx->cm_id->context = ctx;
331 uevent->resp.id = ctx->id;
332 }
333
334 if (copy_to_user((void __user *)(unsigned long)cmd.response,
335 &uevent->resp, sizeof uevent->resp)) {
336 ret = -EFAULT;
337 goto done;
338 }
339
340 list_del(&uevent->list);
341 uevent->ctx->events_reported++;
342 if (uevent->mc)
343 uevent->mc->events_reported++;
344 kfree(uevent);
345done:
346 mutex_unlock(&file->mut);
347 return ret;
348}
349
350static ssize_t ucma_create_id(struct ucma_file *file,
351 const char __user *inbuf,
352 int in_len, int out_len)
353{
354 struct rdma_ucm_create_id cmd;
355 struct rdma_ucm_create_id_resp resp;
356 struct ucma_context *ctx;
357 int ret;
358
359 if (out_len < sizeof(resp))
360 return -ENOSPC;
361
362 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
363 return -EFAULT;
364
365 mutex_lock(&file->mut);
366 ctx = ucma_alloc_ctx(file);
367 mutex_unlock(&file->mut);
368 if (!ctx)
369 return -ENOMEM;
370
371 ctx->uid = cmd.uid;
372 ctx->cm_id = rdma_create_id(ucma_event_handler, ctx, cmd.ps);
373 if (IS_ERR(ctx->cm_id)) {
374 ret = PTR_ERR(ctx->cm_id);
375 goto err1;
376 }
377
378 resp.id = ctx->id;
379 if (copy_to_user((void __user *)(unsigned long)cmd.response,
380 &resp, sizeof(resp))) {
381 ret = -EFAULT;
382 goto err2;
383 }
384 return 0;
385
386err2:
387 rdma_destroy_id(ctx->cm_id);
388err1:
389 mutex_lock(&mut);
390 idr_remove(&ctx_idr, ctx->id);
391 mutex_unlock(&mut);
392 kfree(ctx);
393 return ret;
394}
395
396static void ucma_cleanup_multicast(struct ucma_context *ctx)
397{
398 struct ucma_multicast *mc, *tmp;
399
400 mutex_lock(&mut);
401 list_for_each_entry_safe(mc, tmp, &ctx->mc_list, list) {
402 list_del(&mc->list);
403 idr_remove(&multicast_idr, mc->id);
404 kfree(mc);
405 }
406 mutex_unlock(&mut);
407}
408
409static void ucma_cleanup_events(struct ucma_context *ctx)
410{
411 struct ucma_event *uevent, *tmp;
412
413 list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list) {
414 if (uevent->ctx != ctx)
415 continue;
416
417 list_del(&uevent->list);
418
419
420 if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST)
421 rdma_destroy_id(uevent->cm_id);
422
423 kfree(uevent);
424 }
425}
426
427static void ucma_cleanup_mc_events(struct ucma_multicast *mc)
428{
429 struct ucma_event *uevent, *tmp;
430
431 list_for_each_entry_safe(uevent, tmp, &mc->ctx->file->event_list, list) {
432 if (uevent->mc != mc)
433 continue;
434
435 list_del(&uevent->list);
436 kfree(uevent);
437 }
438}
439
440static int ucma_free_ctx(struct ucma_context *ctx)
441{
442 int events_reported;
443
444
445 rdma_destroy_id(ctx->cm_id);
446
447 ucma_cleanup_multicast(ctx);
448
449
450 mutex_lock(&ctx->file->mut);
451 ucma_cleanup_events(ctx);
452 list_del(&ctx->list);
453 mutex_unlock(&ctx->file->mut);
454
455 events_reported = ctx->events_reported;
456 kfree(ctx);
457 return events_reported;
458}
459
460static ssize_t ucma_destroy_id(struct ucma_file *file, const char __user *inbuf,
461 int in_len, int out_len)
462{
463 struct rdma_ucm_destroy_id cmd;
464 struct rdma_ucm_destroy_id_resp resp;
465 struct ucma_context *ctx;
466 int ret = 0;
467
468 if (out_len < sizeof(resp))
469 return -ENOSPC;
470
471 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
472 return -EFAULT;
473
474 mutex_lock(&mut);
475 ctx = _ucma_find_context(cmd.id, file);
476 if (!IS_ERR(ctx))
477 idr_remove(&ctx_idr, ctx->id);
478 mutex_unlock(&mut);
479
480 if (IS_ERR(ctx))
481 return PTR_ERR(ctx);
482
483 ucma_put_ctx(ctx);
484 wait_for_completion(&ctx->comp);
485 resp.events_reported = ucma_free_ctx(ctx);
486
487 if (copy_to_user((void __user *)(unsigned long)cmd.response,
488 &resp, sizeof(resp)))
489 ret = -EFAULT;
490
491 return ret;
492}
493
494static ssize_t ucma_bind_addr(struct ucma_file *file, const char __user *inbuf,
495 int in_len, int out_len)
496{
497 struct rdma_ucm_bind_addr cmd;
498 struct ucma_context *ctx;
499 int ret;
500
501 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
502 return -EFAULT;
503
504 ctx = ucma_get_ctx(file, cmd.id);
505 if (IS_ERR(ctx))
506 return PTR_ERR(ctx);
507
508 ret = rdma_bind_addr(ctx->cm_id, (struct sockaddr *) &cmd.addr);
509 ucma_put_ctx(ctx);
510 return ret;
511}
512
513static ssize_t ucma_resolve_addr(struct ucma_file *file,
514 const char __user *inbuf,
515 int in_len, int out_len)
516{
517 struct rdma_ucm_resolve_addr cmd;
518 struct ucma_context *ctx;
519 int ret;
520
521 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
522 return -EFAULT;
523
524 ctx = ucma_get_ctx(file, cmd.id);
525 if (IS_ERR(ctx))
526 return PTR_ERR(ctx);
527
528 ret = rdma_resolve_addr(ctx->cm_id, (struct sockaddr *) &cmd.src_addr,
529 (struct sockaddr *) &cmd.dst_addr,
530 cmd.timeout_ms);
531 ucma_put_ctx(ctx);
532 return ret;
533}
534
535static ssize_t ucma_resolve_route(struct ucma_file *file,
536 const char __user *inbuf,
537 int in_len, int out_len)
538{
539 struct rdma_ucm_resolve_route cmd;
540 struct ucma_context *ctx;
541 int ret;
542
543 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
544 return -EFAULT;
545
546 ctx = ucma_get_ctx(file, cmd.id);
547 if (IS_ERR(ctx))
548 return PTR_ERR(ctx);
549
550 ret = rdma_resolve_route(ctx->cm_id, cmd.timeout_ms);
551 ucma_put_ctx(ctx);
552 return ret;
553}
554
555static void ucma_copy_ib_route(struct rdma_ucm_query_route_resp *resp,
556 struct rdma_route *route)
557{
558 struct rdma_dev_addr *dev_addr;
559
560 resp->num_paths = route->num_paths;
561 switch (route->num_paths) {
562 case 0:
563 dev_addr = &route->addr.dev_addr;
564 ib_addr_get_dgid(dev_addr,
565 (union ib_gid *) &resp->ib_route[0].dgid);
566 ib_addr_get_sgid(dev_addr,
567 (union ib_gid *) &resp->ib_route[0].sgid);
568 resp->ib_route[0].pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
569 break;
570 case 2:
571 ib_copy_path_rec_to_user(&resp->ib_route[1],
572 &route->path_rec[1]);
573
574 case 1:
575 ib_copy_path_rec_to_user(&resp->ib_route[0],
576 &route->path_rec[0]);
577 break;
578 default:
579 break;
580 }
581}
582
583static ssize_t ucma_query_route(struct ucma_file *file,
584 const char __user *inbuf,
585 int in_len, int out_len)
586{
587 struct rdma_ucm_query_route cmd;
588 struct rdma_ucm_query_route_resp resp;
589 struct ucma_context *ctx;
590 struct sockaddr *addr;
591 int ret = 0;
592
593 if (out_len < sizeof(resp))
594 return -ENOSPC;
595
596 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
597 return -EFAULT;
598
599 ctx = ucma_get_ctx(file, cmd.id);
600 if (IS_ERR(ctx))
601 return PTR_ERR(ctx);
602
603 memset(&resp, 0, sizeof resp);
604 addr = (struct sockaddr *) &ctx->cm_id->route.addr.src_addr;
605 memcpy(&resp.src_addr, addr, addr->sa_family == AF_INET ?
606 sizeof(struct sockaddr_in) :
607 sizeof(struct sockaddr_in6));
608 addr = (struct sockaddr *) &ctx->cm_id->route.addr.dst_addr;
609 memcpy(&resp.dst_addr, addr, addr->sa_family == AF_INET ?
610 sizeof(struct sockaddr_in) :
611 sizeof(struct sockaddr_in6));
612 if (!ctx->cm_id->device)
613 goto out;
614
615 resp.node_guid = (__force __u64) ctx->cm_id->device->node_guid;
616 resp.port_num = ctx->cm_id->port_num;
617 switch (rdma_node_get_transport(ctx->cm_id->device->node_type)) {
618 case RDMA_TRANSPORT_IB:
619 ucma_copy_ib_route(&resp, &ctx->cm_id->route);
620 break;
621 default:
622 break;
623 }
624
625out:
626 if (copy_to_user((void __user *)(unsigned long)cmd.response,
627 &resp, sizeof(resp)))
628 ret = -EFAULT;
629
630 ucma_put_ctx(ctx);
631 return ret;
632}
633
634static void ucma_copy_conn_param(struct rdma_conn_param *dst,
635 struct rdma_ucm_conn_param *src)
636{
637 dst->private_data = src->private_data;
638 dst->private_data_len = src->private_data_len;
639 dst->responder_resources =src->responder_resources;
640 dst->initiator_depth = src->initiator_depth;
641 dst->flow_control = src->flow_control;
642 dst->retry_count = src->retry_count;
643 dst->rnr_retry_count = src->rnr_retry_count;
644 dst->srq = src->srq;
645 dst->qp_num = src->qp_num;
646}
647
648static ssize_t ucma_connect(struct ucma_file *file, const char __user *inbuf,
649 int in_len, int out_len)
650{
651 struct rdma_ucm_connect cmd;
652 struct rdma_conn_param conn_param;
653 struct ucma_context *ctx;
654 int ret;
655
656 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
657 return -EFAULT;
658
659 if (!cmd.conn_param.valid)
660 return -EINVAL;
661
662 ctx = ucma_get_ctx(file, cmd.id);
663 if (IS_ERR(ctx))
664 return PTR_ERR(ctx);
665
666 ucma_copy_conn_param(&conn_param, &cmd.conn_param);
667 ret = rdma_connect(ctx->cm_id, &conn_param);
668 ucma_put_ctx(ctx);
669 return ret;
670}
671
672static ssize_t ucma_listen(struct ucma_file *file, const char __user *inbuf,
673 int in_len, int out_len)
674{
675 struct rdma_ucm_listen cmd;
676 struct ucma_context *ctx;
677 int ret;
678
679 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
680 return -EFAULT;
681
682 ctx = ucma_get_ctx(file, cmd.id);
683 if (IS_ERR(ctx))
684 return PTR_ERR(ctx);
685
686 ctx->backlog = cmd.backlog > 0 && cmd.backlog < UCMA_MAX_BACKLOG ?
687 cmd.backlog : UCMA_MAX_BACKLOG;
688 ret = rdma_listen(ctx->cm_id, ctx->backlog);
689 ucma_put_ctx(ctx);
690 return ret;
691}
692
693static ssize_t ucma_accept(struct ucma_file *file, const char __user *inbuf,
694 int in_len, int out_len)
695{
696 struct rdma_ucm_accept cmd;
697 struct rdma_conn_param conn_param;
698 struct ucma_context *ctx;
699 int ret;
700
701 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
702 return -EFAULT;
703
704 ctx = ucma_get_ctx(file, cmd.id);
705 if (IS_ERR(ctx))
706 return PTR_ERR(ctx);
707
708 if (cmd.conn_param.valid) {
709 ctx->uid = cmd.uid;
710 ucma_copy_conn_param(&conn_param, &cmd.conn_param);
711 ret = rdma_accept(ctx->cm_id, &conn_param);
712 } else
713 ret = rdma_accept(ctx->cm_id, NULL);
714
715 ucma_put_ctx(ctx);
716 return ret;
717}
718
719static ssize_t ucma_reject(struct ucma_file *file, const char __user *inbuf,
720 int in_len, int out_len)
721{
722 struct rdma_ucm_reject cmd;
723 struct ucma_context *ctx;
724 int ret;
725
726 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
727 return -EFAULT;
728
729 ctx = ucma_get_ctx(file, cmd.id);
730 if (IS_ERR(ctx))
731 return PTR_ERR(ctx);
732
733 ret = rdma_reject(ctx->cm_id, cmd.private_data, cmd.private_data_len);
734 ucma_put_ctx(ctx);
735 return ret;
736}
737
738static ssize_t ucma_disconnect(struct ucma_file *file, const char __user *inbuf,
739 int in_len, int out_len)
740{
741 struct rdma_ucm_disconnect cmd;
742 struct ucma_context *ctx;
743 int ret;
744
745 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
746 return -EFAULT;
747
748 ctx = ucma_get_ctx(file, cmd.id);
749 if (IS_ERR(ctx))
750 return PTR_ERR(ctx);
751
752 ret = rdma_disconnect(ctx->cm_id);
753 ucma_put_ctx(ctx);
754 return ret;
755}
756
757static ssize_t ucma_init_qp_attr(struct ucma_file *file,
758 const char __user *inbuf,
759 int in_len, int out_len)
760{
761 struct rdma_ucm_init_qp_attr cmd;
762 struct ib_uverbs_qp_attr resp;
763 struct ucma_context *ctx;
764 struct ib_qp_attr qp_attr;
765 int ret;
766
767 if (out_len < sizeof(resp))
768 return -ENOSPC;
769
770 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
771 return -EFAULT;
772
773 ctx = ucma_get_ctx(file, cmd.id);
774 if (IS_ERR(ctx))
775 return PTR_ERR(ctx);
776
777 resp.qp_attr_mask = 0;
778 memset(&qp_attr, 0, sizeof qp_attr);
779 qp_attr.qp_state = cmd.qp_state;
780 ret = rdma_init_qp_attr(ctx->cm_id, &qp_attr, &resp.qp_attr_mask);
781 if (ret)
782 goto out;
783
784 ib_copy_qp_attr_to_user(&resp, &qp_attr);
785 if (copy_to_user((void __user *)(unsigned long)cmd.response,
786 &resp, sizeof(resp)))
787 ret = -EFAULT;
788
789out:
790 ucma_put_ctx(ctx);
791 return ret;
792}
793
794static int ucma_set_option_id(struct ucma_context *ctx, int optname,
795 void *optval, size_t optlen)
796{
797 int ret = 0;
798
799 switch (optname) {
800 case RDMA_OPTION_ID_TOS:
801 if (optlen != sizeof(u8)) {
802 ret = -EINVAL;
803 break;
804 }
805 rdma_set_service_type(ctx->cm_id, *((u8 *) optval));
806 break;
807 default:
808 ret = -ENOSYS;
809 }
810
811 return ret;
812}
813
814static int ucma_set_option_level(struct ucma_context *ctx, int level,
815 int optname, void *optval, size_t optlen)
816{
817 int ret;
818
819 switch (level) {
820 case RDMA_OPTION_ID:
821 ret = ucma_set_option_id(ctx, optname, optval, optlen);
822 break;
823 default:
824 ret = -ENOSYS;
825 }
826
827 return ret;
828}
829
830static ssize_t ucma_set_option(struct ucma_file *file, const char __user *inbuf,
831 int in_len, int out_len)
832{
833 struct rdma_ucm_set_option cmd;
834 struct ucma_context *ctx;
835 void *optval;
836 int ret;
837
838 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
839 return -EFAULT;
840
841 ctx = ucma_get_ctx(file, cmd.id);
842 if (IS_ERR(ctx))
843 return PTR_ERR(ctx);
844
845 optval = kmalloc(cmd.optlen, GFP_KERNEL);
846 if (!optval) {
847 ret = -ENOMEM;
848 goto out1;
849 }
850
851 if (copy_from_user(optval, (void __user *) (unsigned long) cmd.optval,
852 cmd.optlen)) {
853 ret = -EFAULT;
854 goto out2;
855 }
856
857 ret = ucma_set_option_level(ctx, cmd.level, cmd.optname, optval,
858 cmd.optlen);
859out2:
860 kfree(optval);
861out1:
862 ucma_put_ctx(ctx);
863 return ret;
864}
865
866static ssize_t ucma_notify(struct ucma_file *file, const char __user *inbuf,
867 int in_len, int out_len)
868{
869 struct rdma_ucm_notify cmd;
870 struct ucma_context *ctx;
871 int ret;
872
873 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
874 return -EFAULT;
875
876 ctx = ucma_get_ctx(file, cmd.id);
877 if (IS_ERR(ctx))
878 return PTR_ERR(ctx);
879
880 ret = rdma_notify(ctx->cm_id, (enum ib_event_type) cmd.event);
881 ucma_put_ctx(ctx);
882 return ret;
883}
884
885static ssize_t ucma_join_multicast(struct ucma_file *file,
886 const char __user *inbuf,
887 int in_len, int out_len)
888{
889 struct rdma_ucm_join_mcast cmd;
890 struct rdma_ucm_create_id_resp resp;
891 struct ucma_context *ctx;
892 struct ucma_multicast *mc;
893 int ret;
894
895 if (out_len < sizeof(resp))
896 return -ENOSPC;
897
898 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
899 return -EFAULT;
900
901 ctx = ucma_get_ctx(file, cmd.id);
902 if (IS_ERR(ctx))
903 return PTR_ERR(ctx);
904
905 mutex_lock(&file->mut);
906 mc = ucma_alloc_multicast(ctx);
907 if (!mc) {
908 ret = -ENOMEM;
909 goto err1;
910 }
911
912 mc->uid = cmd.uid;
913 memcpy(&mc->addr, &cmd.addr, sizeof cmd.addr);
914 ret = rdma_join_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr, mc);
915 if (ret)
916 goto err2;
917
918 resp.id = mc->id;
919 if (copy_to_user((void __user *)(unsigned long)cmd.response,
920 &resp, sizeof(resp))) {
921 ret = -EFAULT;
922 goto err3;
923 }
924
925 mutex_unlock(&file->mut);
926 ucma_put_ctx(ctx);
927 return 0;
928
929err3:
930 rdma_leave_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr);
931 ucma_cleanup_mc_events(mc);
932err2:
933 mutex_lock(&mut);
934 idr_remove(&multicast_idr, mc->id);
935 mutex_unlock(&mut);
936 list_del(&mc->list);
937 kfree(mc);
938err1:
939 mutex_unlock(&file->mut);
940 ucma_put_ctx(ctx);
941 return ret;
942}
943
944static ssize_t ucma_leave_multicast(struct ucma_file *file,
945 const char __user *inbuf,
946 int in_len, int out_len)
947{
948 struct rdma_ucm_destroy_id cmd;
949 struct rdma_ucm_destroy_id_resp resp;
950 struct ucma_multicast *mc;
951 int ret = 0;
952
953 if (out_len < sizeof(resp))
954 return -ENOSPC;
955
956 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
957 return -EFAULT;
958
959 mutex_lock(&mut);
960 mc = idr_find(&multicast_idr, cmd.id);
961 if (!mc)
962 mc = ERR_PTR(-ENOENT);
963 else if (mc->ctx->file != file)
964 mc = ERR_PTR(-EINVAL);
965 else {
966 idr_remove(&multicast_idr, mc->id);
967 atomic_inc(&mc->ctx->ref);
968 }
969 mutex_unlock(&mut);
970
971 if (IS_ERR(mc)) {
972 ret = PTR_ERR(mc);
973 goto out;
974 }
975
976 rdma_leave_multicast(mc->ctx->cm_id, (struct sockaddr *) &mc->addr);
977 mutex_lock(&mc->ctx->file->mut);
978 ucma_cleanup_mc_events(mc);
979 list_del(&mc->list);
980 mutex_unlock(&mc->ctx->file->mut);
981
982 ucma_put_ctx(mc->ctx);
983 resp.events_reported = mc->events_reported;
984 kfree(mc);
985
986 if (copy_to_user((void __user *)(unsigned long)cmd.response,
987 &resp, sizeof(resp)))
988 ret = -EFAULT;
989out:
990 return ret;
991}
992
993static void ucma_lock_files(struct ucma_file *file1, struct ucma_file *file2)
994{
995
996 if (file1 < file2) {
997 mutex_lock(&file1->mut);
998 mutex_lock(&file2->mut);
999 } else {
1000 mutex_lock(&file2->mut);
1001 mutex_lock(&file1->mut);
1002 }
1003}
1004
1005static void ucma_unlock_files(struct ucma_file *file1, struct ucma_file *file2)
1006{
1007 if (file1 < file2) {
1008 mutex_unlock(&file2->mut);
1009 mutex_unlock(&file1->mut);
1010 } else {
1011 mutex_unlock(&file1->mut);
1012 mutex_unlock(&file2->mut);
1013 }
1014}
1015
1016static void ucma_move_events(struct ucma_context *ctx, struct ucma_file *file)
1017{
1018 struct ucma_event *uevent, *tmp;
1019
1020 list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list)
1021 if (uevent->ctx == ctx)
1022 list_move_tail(&uevent->list, &file->event_list);
1023}
1024
1025static ssize_t ucma_migrate_id(struct ucma_file *new_file,
1026 const char __user *inbuf,
1027 int in_len, int out_len)
1028{
1029 struct rdma_ucm_migrate_id cmd;
1030 struct rdma_ucm_migrate_resp resp;
1031 struct ucma_context *ctx;
1032 struct file *filp;
1033 struct ucma_file *cur_file;
1034 int ret = 0;
1035
1036 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1037 return -EFAULT;
1038
1039
1040 filp = fget(cmd.fd);
1041 if (!filp)
1042 return -ENOENT;
1043
1044
1045 ctx = ucma_get_ctx(filp->private_data, cmd.id);
1046 if (IS_ERR(ctx)) {
1047 ret = PTR_ERR(ctx);
1048 goto file_put;
1049 }
1050
1051 cur_file = ctx->file;
1052 if (cur_file == new_file) {
1053 resp.events_reported = ctx->events_reported;
1054 goto response;
1055 }
1056
1057
1058
1059
1060
1061 ucma_lock_files(cur_file, new_file);
1062 mutex_lock(&mut);
1063
1064 list_move_tail(&ctx->list, &new_file->ctx_list);
1065 ucma_move_events(ctx, new_file);
1066 ctx->file = new_file;
1067 resp.events_reported = ctx->events_reported;
1068
1069 mutex_unlock(&mut);
1070 ucma_unlock_files(cur_file, new_file);
1071
1072response:
1073 if (copy_to_user((void __user *)(unsigned long)cmd.response,
1074 &resp, sizeof(resp)))
1075 ret = -EFAULT;
1076
1077 ucma_put_ctx(ctx);
1078file_put:
1079 fput(filp);
1080 return ret;
1081}
1082
1083static ssize_t (*ucma_cmd_table[])(struct ucma_file *file,
1084 const char __user *inbuf,
1085 int in_len, int out_len) = {
1086 [RDMA_USER_CM_CMD_CREATE_ID] = ucma_create_id,
1087 [RDMA_USER_CM_CMD_DESTROY_ID] = ucma_destroy_id,
1088 [RDMA_USER_CM_CMD_BIND_ADDR] = ucma_bind_addr,
1089 [RDMA_USER_CM_CMD_RESOLVE_ADDR] = ucma_resolve_addr,
1090 [RDMA_USER_CM_CMD_RESOLVE_ROUTE]= ucma_resolve_route,
1091 [RDMA_USER_CM_CMD_QUERY_ROUTE] = ucma_query_route,
1092 [RDMA_USER_CM_CMD_CONNECT] = ucma_connect,
1093 [RDMA_USER_CM_CMD_LISTEN] = ucma_listen,
1094 [RDMA_USER_CM_CMD_ACCEPT] = ucma_accept,
1095 [RDMA_USER_CM_CMD_REJECT] = ucma_reject,
1096 [RDMA_USER_CM_CMD_DISCONNECT] = ucma_disconnect,
1097 [RDMA_USER_CM_CMD_INIT_QP_ATTR] = ucma_init_qp_attr,
1098 [RDMA_USER_CM_CMD_GET_EVENT] = ucma_get_event,
1099 [RDMA_USER_CM_CMD_GET_OPTION] = NULL,
1100 [RDMA_USER_CM_CMD_SET_OPTION] = ucma_set_option,
1101 [RDMA_USER_CM_CMD_NOTIFY] = ucma_notify,
1102 [RDMA_USER_CM_CMD_JOIN_MCAST] = ucma_join_multicast,
1103 [RDMA_USER_CM_CMD_LEAVE_MCAST] = ucma_leave_multicast,
1104 [RDMA_USER_CM_CMD_MIGRATE_ID] = ucma_migrate_id
1105};
1106
1107static ssize_t ucma_write(struct file *filp, const char __user *buf,
1108 size_t len, loff_t *pos)
1109{
1110 struct ucma_file *file = filp->private_data;
1111 struct rdma_ucm_cmd_hdr hdr;
1112 ssize_t ret;
1113
1114 if (len < sizeof(hdr))
1115 return -EINVAL;
1116
1117 if (copy_from_user(&hdr, buf, sizeof(hdr)))
1118 return -EFAULT;
1119
1120 if (hdr.cmd < 0 || hdr.cmd >= ARRAY_SIZE(ucma_cmd_table))
1121 return -EINVAL;
1122
1123 if (hdr.in + sizeof(hdr) > len)
1124 return -EINVAL;
1125
1126 if (!ucma_cmd_table[hdr.cmd])
1127 return -ENOSYS;
1128
1129 ret = ucma_cmd_table[hdr.cmd](file, buf + sizeof(hdr), hdr.in, hdr.out);
1130 if (!ret)
1131 ret = len;
1132
1133 return ret;
1134}
1135
1136static unsigned int ucma_poll(struct file *filp, struct poll_table_struct *wait)
1137{
1138 struct ucma_file *file = filp->private_data;
1139 unsigned int mask = 0;
1140
1141 poll_wait(filp, &file->poll_wait, wait);
1142
1143 if (!list_empty(&file->event_list))
1144 mask = POLLIN | POLLRDNORM;
1145
1146 return mask;
1147}
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157static int ucma_open(struct inode *inode, struct file *filp)
1158{
1159 struct ucma_file *file;
1160
1161 file = kmalloc(sizeof *file, GFP_KERNEL);
1162 if (!file)
1163 return -ENOMEM;
1164
1165 INIT_LIST_HEAD(&file->event_list);
1166 INIT_LIST_HEAD(&file->ctx_list);
1167 init_waitqueue_head(&file->poll_wait);
1168 mutex_init(&file->mut);
1169
1170 filp->private_data = file;
1171 file->filp = filp;
1172 return 0;
1173}
1174
1175static int ucma_close(struct inode *inode, struct file *filp)
1176{
1177 struct ucma_file *file = filp->private_data;
1178 struct ucma_context *ctx, *tmp;
1179
1180 mutex_lock(&file->mut);
1181 list_for_each_entry_safe(ctx, tmp, &file->ctx_list, list) {
1182 mutex_unlock(&file->mut);
1183
1184 mutex_lock(&mut);
1185 idr_remove(&ctx_idr, ctx->id);
1186 mutex_unlock(&mut);
1187
1188 ucma_free_ctx(ctx);
1189 mutex_lock(&file->mut);
1190 }
1191 mutex_unlock(&file->mut);
1192 kfree(file);
1193 return 0;
1194}
1195
1196static const struct file_operations ucma_fops = {
1197 .owner = THIS_MODULE,
1198 .open = ucma_open,
1199 .release = ucma_close,
1200 .write = ucma_write,
1201 .poll = ucma_poll,
1202};
1203
1204static struct miscdevice ucma_misc = {
1205 .minor = MISC_DYNAMIC_MINOR,
1206 .name = "rdma_cm",
1207 .fops = &ucma_fops,
1208};
1209
1210static ssize_t show_abi_version(struct device *dev,
1211 struct device_attribute *attr,
1212 char *buf)
1213{
1214 return sprintf(buf, "%d\n", RDMA_USER_CM_ABI_VERSION);
1215}
1216static DEVICE_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
1217
1218static int __init ucma_init(void)
1219{
1220 int ret;
1221
1222 ret = misc_register(&ucma_misc);
1223 if (ret)
1224 return ret;
1225
1226 ret = device_create_file(ucma_misc.this_device, &dev_attr_abi_version);
1227 if (ret) {
1228 printk(KERN_ERR "rdma_ucm: couldn't create abi_version attr\n");
1229 goto err;
1230 }
1231 return 0;
1232err:
1233 misc_deregister(&ucma_misc);
1234 return ret;
1235}
1236
1237static void __exit ucma_cleanup(void)
1238{
1239 device_remove_file(ucma_misc.this_device, &dev_attr_abi_version);
1240 misc_deregister(&ucma_misc);
1241 idr_destroy(&ctx_idr);
1242}
1243
1244module_init(ucma_init);
1245module_exit(ucma_cleanup);
1246
