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34#include <linux/completion.h>
35#include <linux/init.h>
36#include <linux/fs.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>
48
49#include <asm/uaccess.h>
50
51#include <rdma/ib_cm.h>
52#include <rdma/ib_user_cm.h>
53#include <rdma/ib_marshall.h>
54
55MODULE_AUTHOR("Libor Michalek");
56MODULE_DESCRIPTION("InfiniBand userspace Connection Manager access");
57MODULE_LICENSE("Dual BSD/GPL");
58
59struct ib_ucm_device {
60 int devnum;
61 struct cdev cdev;
62 struct device dev;
63 struct ib_device *ib_dev;
64};
65
66struct ib_ucm_file {
67 struct mutex file_mutex;
68 struct file *filp;
69 struct ib_ucm_device *device;
70
71 struct list_head ctxs;
72 struct list_head events;
73 wait_queue_head_t poll_wait;
74};
75
76struct ib_ucm_context {
77 int id;
78 struct completion comp;
79 atomic_t ref;
80 int events_reported;
81
82 struct ib_ucm_file *file;
83 struct ib_cm_id *cm_id;
84 __u64 uid;
85
86 struct list_head events;
87 struct list_head file_list;
88};
89
90struct ib_ucm_event {
91 struct ib_ucm_context *ctx;
92 struct list_head file_list;
93 struct list_head ctx_list;
94
95 struct ib_cm_id *cm_id;
96 struct ib_ucm_event_resp resp;
97 void *data;
98 void *info;
99 int data_len;
100 int info_len;
101};
102
103enum {
104 IB_UCM_MAJOR = 231,
105 IB_UCM_BASE_MINOR = 224,
106 IB_UCM_MAX_DEVICES = 32
107};
108
109#define IB_UCM_BASE_DEV MKDEV(IB_UCM_MAJOR, IB_UCM_BASE_MINOR)
110
111static void ib_ucm_add_one(struct ib_device *device);
112static void ib_ucm_remove_one(struct ib_device *device);
113
114static struct ib_client ucm_client = {
115 .name = "ucm",
116 .add = ib_ucm_add_one,
117 .remove = ib_ucm_remove_one
118};
119
120static DEFINE_MUTEX(ctx_id_mutex);
121static DEFINE_IDR(ctx_id_table);
122static DECLARE_BITMAP(dev_map, IB_UCM_MAX_DEVICES);
123
124static struct ib_ucm_context *ib_ucm_ctx_get(struct ib_ucm_file *file, int id)
125{
126 struct ib_ucm_context *ctx;
127
128 mutex_lock(&ctx_id_mutex);
129 ctx = idr_find(&ctx_id_table, id);
130 if (!ctx)
131 ctx = ERR_PTR(-ENOENT);
132 else if (ctx->file != file)
133 ctx = ERR_PTR(-EINVAL);
134 else
135 atomic_inc(&ctx->ref);
136 mutex_unlock(&ctx_id_mutex);
137
138 return ctx;
139}
140
141static void ib_ucm_ctx_put(struct ib_ucm_context *ctx)
142{
143 if (atomic_dec_and_test(&ctx->ref))
144 complete(&ctx->comp);
145}
146
147static inline int ib_ucm_new_cm_id(int event)
148{
149 return event == IB_CM_REQ_RECEIVED || event == IB_CM_SIDR_REQ_RECEIVED;
150}
151
152static void ib_ucm_cleanup_events(struct ib_ucm_context *ctx)
153{
154 struct ib_ucm_event *uevent;
155
156 mutex_lock(&ctx->file->file_mutex);
157 list_del(&ctx->file_list);
158 while (!list_empty(&ctx->events)) {
159
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);
165
166
167 if (ib_ucm_new_cm_id(uevent->resp.event))
168 ib_destroy_cm_id(uevent->cm_id);
169
170 kfree(uevent);
171 mutex_lock(&ctx->file->file_mutex);
172 }
173 mutex_unlock(&ctx->file->file_mutex);
174}
175
176static struct ib_ucm_context *ib_ucm_ctx_alloc(struct ib_ucm_file *file)
177{
178 struct ib_ucm_context *ctx;
179 int result;
180
181 ctx = kzalloc(sizeof *ctx, GFP_KERNEL);
182 if (!ctx)
183 return NULL;
184
185 atomic_set(&ctx->ref, 1);
186 init_completion(&ctx->comp);
187 ctx->file = file;
188 INIT_LIST_HEAD(&ctx->events);
189
190 do {
191 result = idr_pre_get(&ctx_id_table, GFP_KERNEL);
192 if (!result)
193 goto error;
194
195 mutex_lock(&ctx_id_mutex);
196 result = idr_get_new(&ctx_id_table, ctx, &ctx->id);
197 mutex_unlock(&ctx_id_mutex);
198 } while (result == -EAGAIN);
199
200 if (result)
201 goto error;
202
203 list_add_tail(&ctx->file_list, &file->ctxs);
204 return ctx;
205
206error:
207 kfree(ctx);
208 return NULL;
209}
210
211static void ib_ucm_event_req_get(struct ib_ucm_req_event_resp *ureq,
212 struct ib_cm_req_event_param *kreq)
213{
214 ureq->remote_ca_guid = kreq->remote_ca_guid;
215 ureq->remote_qkey = kreq->remote_qkey;
216 ureq->remote_qpn = kreq->remote_qpn;
217 ureq->qp_type = kreq->qp_type;
218 ureq->starting_psn = kreq->starting_psn;
219 ureq->responder_resources = kreq->responder_resources;
220 ureq->initiator_depth = kreq->initiator_depth;
221 ureq->local_cm_response_timeout = kreq->local_cm_response_timeout;
222 ureq->flow_control = kreq->flow_control;
223 ureq->remote_cm_response_timeout = kreq->remote_cm_response_timeout;
224 ureq->retry_count = kreq->retry_count;
225 ureq->rnr_retry_count = kreq->rnr_retry_count;
226 ureq->srq = kreq->srq;
227 ureq->port = kreq->port;
228
229 ib_copy_path_rec_to_user(&ureq->primary_path, kreq->primary_path);
230 if (kreq->alternate_path)
231 ib_copy_path_rec_to_user(&ureq->alternate_path,
232 kreq->alternate_path);
233}
234
235static void ib_ucm_event_rep_get(struct ib_ucm_rep_event_resp *urep,
236 struct ib_cm_rep_event_param *krep)
237{
238 urep->remote_ca_guid = krep->remote_ca_guid;
239 urep->remote_qkey = krep->remote_qkey;
240 urep->remote_qpn = krep->remote_qpn;
241 urep->starting_psn = krep->starting_psn;
242 urep->responder_resources = krep->responder_resources;
243 urep->initiator_depth = krep->initiator_depth;
244 urep->target_ack_delay = krep->target_ack_delay;
245 urep->failover_accepted = krep->failover_accepted;
246 urep->flow_control = krep->flow_control;
247 urep->rnr_retry_count = krep->rnr_retry_count;
248 urep->srq = krep->srq;
249}
250
251static void ib_ucm_event_sidr_rep_get(struct ib_ucm_sidr_rep_event_resp *urep,
252 struct ib_cm_sidr_rep_event_param *krep)
253{
254 urep->status = krep->status;
255 urep->qkey = krep->qkey;
256 urep->qpn = krep->qpn;
257};
258
259static int ib_ucm_event_process(struct ib_cm_event *evt,
260 struct ib_ucm_event *uvt)
261{
262 void *info = NULL;
263
264 switch (evt->event) {
265 case IB_CM_REQ_RECEIVED:
266 ib_ucm_event_req_get(&uvt->resp.u.req_resp,
267 &evt->param.req_rcvd);
268 uvt->data_len = IB_CM_REQ_PRIVATE_DATA_SIZE;
269 uvt->resp.present = IB_UCM_PRES_PRIMARY;
270 uvt->resp.present |= (evt->param.req_rcvd.alternate_path ?
271 IB_UCM_PRES_ALTERNATE : 0);
272 break;
273 case IB_CM_REP_RECEIVED:
274 ib_ucm_event_rep_get(&uvt->resp.u.rep_resp,
275 &evt->param.rep_rcvd);
276 uvt->data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
277 break;
278 case IB_CM_RTU_RECEIVED:
279 uvt->data_len = IB_CM_RTU_PRIVATE_DATA_SIZE;
280 uvt->resp.u.send_status = evt->param.send_status;
281 break;
282 case IB_CM_DREQ_RECEIVED:
283 uvt->data_len = IB_CM_DREQ_PRIVATE_DATA_SIZE;
284 uvt->resp.u.send_status = evt->param.send_status;
285 break;
286 case IB_CM_DREP_RECEIVED:
287 uvt->data_len = IB_CM_DREP_PRIVATE_DATA_SIZE;
288 uvt->resp.u.send_status = evt->param.send_status;
289 break;
290 case IB_CM_MRA_RECEIVED:
291 uvt->resp.u.mra_resp.timeout =
292 evt->param.mra_rcvd.service_timeout;
293 uvt->data_len = IB_CM_MRA_PRIVATE_DATA_SIZE;
294 break;
295 case IB_CM_REJ_RECEIVED:
296 uvt->resp.u.rej_resp.reason = evt->param.rej_rcvd.reason;
297 uvt->data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
298 uvt->info_len = evt->param.rej_rcvd.ari_length;
299 info = evt->param.rej_rcvd.ari;
300 break;
301 case IB_CM_LAP_RECEIVED:
302 ib_copy_path_rec_to_user(&uvt->resp.u.lap_resp.path,
303 evt->param.lap_rcvd.alternate_path);
304 uvt->data_len = IB_CM_LAP_PRIVATE_DATA_SIZE;
305 uvt->resp.present = IB_UCM_PRES_ALTERNATE;
306 break;
307 case IB_CM_APR_RECEIVED:
308 uvt->resp.u.apr_resp.status = evt->param.apr_rcvd.ap_status;
309 uvt->data_len = IB_CM_APR_PRIVATE_DATA_SIZE;
310 uvt->info_len = evt->param.apr_rcvd.info_len;
311 info = evt->param.apr_rcvd.apr_info;
312 break;
313 case IB_CM_SIDR_REQ_RECEIVED:
314 uvt->resp.u.sidr_req_resp.pkey =
315 evt->param.sidr_req_rcvd.pkey;
316 uvt->resp.u.sidr_req_resp.port =
317 evt->param.sidr_req_rcvd.port;
318 uvt->data_len = IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE;
319 break;
320 case IB_CM_SIDR_REP_RECEIVED:
321 ib_ucm_event_sidr_rep_get(&uvt->resp.u.sidr_rep_resp,
322 &evt->param.sidr_rep_rcvd);
323 uvt->data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
324 uvt->info_len = evt->param.sidr_rep_rcvd.info_len;
325 info = evt->param.sidr_rep_rcvd.info;
326 break;
327 default:
328 uvt->resp.u.send_status = evt->param.send_status;
329 break;
330 }
331
332 if (uvt->data_len) {
333 uvt->data = kmemdup(evt->private_data, uvt->data_len, GFP_KERNEL);
334 if (!uvt->data)
335 goto err1;
336
337 uvt->resp.present |= IB_UCM_PRES_DATA;
338 }
339
340 if (uvt->info_len) {
341 uvt->info = kmemdup(info, uvt->info_len, GFP_KERNEL);
342 if (!uvt->info)
343 goto err2;
344
345 uvt->resp.present |= IB_UCM_PRES_INFO;
346 }
347 return 0;
348
349err2:
350 kfree(uvt->data);
351err1:
352 return -ENOMEM;
353}
354
355static int ib_ucm_event_handler(struct ib_cm_id *cm_id,
356 struct ib_cm_event *event)
357{
358 struct ib_ucm_event *uevent;
359 struct ib_ucm_context *ctx;
360 int result = 0;
361
362 ctx = cm_id->context;
363
364 uevent = kzalloc(sizeof *uevent, GFP_KERNEL);
365 if (!uevent)
366 goto err1;
367
368 uevent->ctx = ctx;
369 uevent->cm_id = cm_id;
370 uevent->resp.uid = ctx->uid;
371 uevent->resp.id = ctx->id;
372 uevent->resp.event = event->event;
373
374 result = ib_ucm_event_process(event, uevent);
375 if (result)
376 goto err2;
377
378 mutex_lock(&ctx->file->file_mutex);
379 list_add_tail(&uevent->file_list, &ctx->file->events);
380 list_add_tail(&uevent->ctx_list, &ctx->events);
381 wake_up_interruptible(&ctx->file->poll_wait);
382 mutex_unlock(&ctx->file->file_mutex);
383 return 0;
384
385err2:
386 kfree(uevent);
387err1:
388
389 return ib_ucm_new_cm_id(event->event);
390}
391
392static ssize_t ib_ucm_event(struct ib_ucm_file *file,
393 const char __user *inbuf,
394 int in_len, int out_len)
395{
396 struct ib_ucm_context *ctx;
397 struct ib_ucm_event_get cmd;
398 struct ib_ucm_event *uevent;
399 int result = 0;
400
401 if (out_len < sizeof(struct ib_ucm_event_resp))
402 return -ENOSPC;
403
404 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
405 return -EFAULT;
406
407 mutex_lock(&file->file_mutex);
408 while (list_empty(&file->events)) {
409 mutex_unlock(&file->file_mutex);
410
411 if (file->filp->f_flags & O_NONBLOCK)
412 return -EAGAIN;
413
414 if (wait_event_interruptible(file->poll_wait,
415 !list_empty(&file->events)))
416 return -ERESTARTSYS;
417
418 mutex_lock(&file->file_mutex);
419 }
420
421 uevent = list_entry(file->events.next, struct ib_ucm_event, file_list);
422
423 if (ib_ucm_new_cm_id(uevent->resp.event)) {
424 ctx = ib_ucm_ctx_alloc(file);
425 if (!ctx) {
426 result = -ENOMEM;
427 goto done;
428 }
429
430 ctx->cm_id = uevent->cm_id;
431 ctx->cm_id->context = ctx;
432 uevent->resp.id = ctx->id;
433 }
434
435 if (copy_to_user((void __user *)(unsigned long)cmd.response,
436 &uevent->resp, sizeof(uevent->resp))) {
437 result = -EFAULT;
438 goto done;
439 }
440
441 if (uevent->data) {
442 if (cmd.data_len < uevent->data_len) {
443 result = -ENOMEM;
444 goto done;
445 }
446 if (copy_to_user((void __user *)(unsigned long)cmd.data,
447 uevent->data, uevent->data_len)) {
448 result = -EFAULT;
449 goto done;
450 }
451 }
452
453 if (uevent->info) {
454 if (cmd.info_len < uevent->info_len) {
455 result = -ENOMEM;
456 goto done;
457 }
458 if (copy_to_user((void __user *)(unsigned long)cmd.info,
459 uevent->info, uevent->info_len)) {
460 result = -EFAULT;
461 goto done;
462 }
463 }
464
465 list_del(&uevent->file_list);
466 list_del(&uevent->ctx_list);
467 uevent->ctx->events_reported++;
468
469 kfree(uevent->data);
470 kfree(uevent->info);
471 kfree(uevent);
472done:
473 mutex_unlock(&file->file_mutex);
474 return result;
475}
476
477static ssize_t ib_ucm_create_id(struct ib_ucm_file *file,
478 const char __user *inbuf,
479 int in_len, int out_len)
480{
481 struct ib_ucm_create_id cmd;
482 struct ib_ucm_create_id_resp resp;
483 struct ib_ucm_context *ctx;
484 int result;
485
486 if (out_len < sizeof(resp))
487 return -ENOSPC;
488
489 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
490 return -EFAULT;
491
492 mutex_lock(&file->file_mutex);
493 ctx = ib_ucm_ctx_alloc(file);
494 mutex_unlock(&file->file_mutex);
495 if (!ctx)
496 return -ENOMEM;
497
498 ctx->uid = cmd.uid;
499 ctx->cm_id = ib_create_cm_id(file->device->ib_dev,
500 ib_ucm_event_handler, ctx);
501 if (IS_ERR(ctx->cm_id)) {
502 result = PTR_ERR(ctx->cm_id);
503 goto err1;
504 }
505
506 resp.id = ctx->id;
507 if (copy_to_user((void __user *)(unsigned long)cmd.response,
508 &resp, sizeof(resp))) {
509 result = -EFAULT;
510 goto err2;
511 }
512 return 0;
513
514err2:
515 ib_destroy_cm_id(ctx->cm_id);
516err1:
517 mutex_lock(&ctx_id_mutex);
518 idr_remove(&ctx_id_table, ctx->id);
519 mutex_unlock(&ctx_id_mutex);
520 kfree(ctx);
521 return result;
522}
523
524static ssize_t ib_ucm_destroy_id(struct ib_ucm_file *file,
525 const char __user *inbuf,
526 int in_len, int out_len)
527{
528 struct ib_ucm_destroy_id cmd;
529 struct ib_ucm_destroy_id_resp resp;
530 struct ib_ucm_context *ctx;
531 int result = 0;
532
533 if (out_len < sizeof(resp))
534 return -ENOSPC;
535
536 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
537 return -EFAULT;
538
539 mutex_lock(&ctx_id_mutex);
540 ctx = idr_find(&ctx_id_table, cmd.id);
541 if (!ctx)
542 ctx = ERR_PTR(-ENOENT);
543 else if (ctx->file != file)
544 ctx = ERR_PTR(-EINVAL);
545 else
546 idr_remove(&ctx_id_table, ctx->id);
547 mutex_unlock(&ctx_id_mutex);
548
549 if (IS_ERR(ctx))
550 return PTR_ERR(ctx);
551
552 ib_ucm_ctx_put(ctx);
553 wait_for_completion(&ctx->comp);
554
555
556 ib_destroy_cm_id(ctx->cm_id);
557
558 ib_ucm_cleanup_events(ctx);
559
560 resp.events_reported = ctx->events_reported;
561 if (copy_to_user((void __user *)(unsigned long)cmd.response,
562 &resp, sizeof(resp)))
563 result = -EFAULT;
564
565 kfree(ctx);
566 return result;
567}
568
569static ssize_t ib_ucm_attr_id(struct ib_ucm_file *file,
570 const char __user *inbuf,
571 int in_len, int out_len)
572{
573 struct ib_ucm_attr_id_resp resp;
574 struct ib_ucm_attr_id cmd;
575 struct ib_ucm_context *ctx;
576 int result = 0;
577
578 if (out_len < sizeof(resp))
579 return -ENOSPC;
580
581 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
582 return -EFAULT;
583
584 ctx = ib_ucm_ctx_get(file, cmd.id);
585 if (IS_ERR(ctx))
586 return PTR_ERR(ctx);
587
588 resp.service_id = ctx->cm_id->service_id;
589 resp.service_mask = ctx->cm_id->service_mask;
590 resp.local_id = ctx->cm_id->local_id;
591 resp.remote_id = ctx->cm_id->remote_id;
592
593 if (copy_to_user((void __user *)(unsigned long)cmd.response,
594 &resp, sizeof(resp)))
595 result = -EFAULT;
596
597 ib_ucm_ctx_put(ctx);
598 return result;
599}
600
601static ssize_t ib_ucm_init_qp_attr(struct ib_ucm_file *file,
602 const char __user *inbuf,
603 int in_len, int out_len)
604{
605 struct ib_uverbs_qp_attr resp;
606 struct ib_ucm_init_qp_attr cmd;
607 struct ib_ucm_context *ctx;
608 struct ib_qp_attr qp_attr;
609 int result = 0;
610
611 if (out_len < sizeof(resp))
612 return -ENOSPC;
613
614 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
615 return -EFAULT;
616
617 ctx = ib_ucm_ctx_get(file, cmd.id);
618 if (IS_ERR(ctx))
619 return PTR_ERR(ctx);
620
621 resp.qp_attr_mask = 0;
622 memset(&qp_attr, 0, sizeof qp_attr);
623 qp_attr.qp_state = cmd.qp_state;
624 result = ib_cm_init_qp_attr(ctx->cm_id, &qp_attr, &resp.qp_attr_mask);
625 if (result)
626 goto out;
627
628 ib_copy_qp_attr_to_user(&resp, &qp_attr);
629
630 if (copy_to_user((void __user *)(unsigned long)cmd.response,
631 &resp, sizeof(resp)))
632 result = -EFAULT;
633
634out:
635 ib_ucm_ctx_put(ctx);
636 return result;
637}
638
639static int ucm_validate_listen(__be64 service_id, __be64 service_mask)
640{
641 service_id &= service_mask;
642
643 if (((service_id & IB_CMA_SERVICE_ID_MASK) == IB_CMA_SERVICE_ID) ||
644 ((service_id & IB_SDP_SERVICE_ID_MASK) == IB_SDP_SERVICE_ID))
645 return -EINVAL;
646
647 return 0;
648}
649
650static ssize_t ib_ucm_listen(struct ib_ucm_file *file,
651 const char __user *inbuf,
652 int in_len, int out_len)
653{
654 struct ib_ucm_listen cmd;
655 struct ib_ucm_context *ctx;
656 int result;
657
658 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
659 return -EFAULT;
660
661 ctx = ib_ucm_ctx_get(file, cmd.id);
662 if (IS_ERR(ctx))
663 return PTR_ERR(ctx);
664
665 result = ucm_validate_listen(cmd.service_id, cmd.service_mask);
666 if (result)
667 goto out;
668
669 result = ib_cm_listen(ctx->cm_id, cmd.service_id, cmd.service_mask,
670 NULL);
671out:
672 ib_ucm_ctx_put(ctx);
673 return result;
674}
675
676static ssize_t ib_ucm_notify(struct ib_ucm_file *file,
677 const char __user *inbuf,
678 int in_len, int out_len)
679{
680 struct ib_ucm_notify cmd;
681 struct ib_ucm_context *ctx;
682 int result;
683
684 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
685 return -EFAULT;
686
687 ctx = ib_ucm_ctx_get(file, cmd.id);
688 if (IS_ERR(ctx))
689 return PTR_ERR(ctx);
690
691 result = ib_cm_notify(ctx->cm_id, (enum ib_event_type) cmd.event);
692 ib_ucm_ctx_put(ctx);
693 return result;
694}
695
696static int ib_ucm_alloc_data(const void **dest, u64 src, u32 len)
697{
698 void *data;
699
700 *dest = NULL;
701
702 if (!len)
703 return 0;
704
705 data = memdup_user((void __user *)(unsigned long)src, len);
706 if (IS_ERR(data))
707 return PTR_ERR(data);
708
709 *dest = data;
710 return 0;
711}
712
713static int ib_ucm_path_get(struct ib_sa_path_rec **path, u64 src)
714{
715 struct ib_user_path_rec upath;
716 struct ib_sa_path_rec *sa_path;
717
718 *path = NULL;
719
720 if (!src)
721 return 0;
722
723 sa_path = kmalloc(sizeof(*sa_path), GFP_KERNEL);
724 if (!sa_path)
725 return -ENOMEM;
726
727 if (copy_from_user(&upath, (void __user *)(unsigned long)src,
728 sizeof(upath))) {
729
730 kfree(sa_path);
731 return -EFAULT;
732 }
733
734 ib_copy_path_rec_from_user(sa_path, &upath);
735 *path = sa_path;
736 return 0;
737}
738
739static ssize_t ib_ucm_send_req(struct ib_ucm_file *file,
740 const char __user *inbuf,
741 int in_len, int out_len)
742{
743 struct ib_cm_req_param param;
744 struct ib_ucm_context *ctx;
745 struct ib_ucm_req cmd;
746 int result;
747
748 param.private_data = NULL;
749 param.primary_path = NULL;
750 param.alternate_path = NULL;
751
752 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
753 return -EFAULT;
754
755 result = ib_ucm_alloc_data(¶m.private_data, cmd.data, cmd.len);
756 if (result)
757 goto done;
758
759 result = ib_ucm_path_get(¶m.primary_path, cmd.primary_path);
760 if (result)
761 goto done;
762
763 result = ib_ucm_path_get(¶m.alternate_path, cmd.alternate_path);
764 if (result)
765 goto done;
766
767 param.private_data_len = cmd.len;
768 param.service_id = cmd.sid;
769 param.qp_num = cmd.qpn;
770 param.qp_type = cmd.qp_type;
771 param.starting_psn = cmd.psn;
772 param.peer_to_peer = cmd.peer_to_peer;
773 param.responder_resources = cmd.responder_resources;
774 param.initiator_depth = cmd.initiator_depth;
775 param.remote_cm_response_timeout = cmd.remote_cm_response_timeout;
776 param.flow_control = cmd.flow_control;
777 param.local_cm_response_timeout = cmd.local_cm_response_timeout;
778 param.retry_count = cmd.retry_count;
779 param.rnr_retry_count = cmd.rnr_retry_count;
780 param.max_cm_retries = cmd.max_cm_retries;
781 param.srq = cmd.srq;
782
783 ctx = ib_ucm_ctx_get(file, cmd.id);
784 if (!IS_ERR(ctx)) {
785 result = ib_send_cm_req(ctx->cm_id, ¶m);
786 ib_ucm_ctx_put(ctx);
787 } else
788 result = PTR_ERR(ctx);
789
790done:
791 kfree(param.private_data);
792 kfree(param.primary_path);
793 kfree(param.alternate_path);
794 return result;
795}
796
797static ssize_t ib_ucm_send_rep(struct ib_ucm_file *file,
798 const char __user *inbuf,
799 int in_len, int out_len)
800{
801 struct ib_cm_rep_param param;
802 struct ib_ucm_context *ctx;
803 struct ib_ucm_rep cmd;
804 int result;
805
806 param.private_data = NULL;
807
808 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
809 return -EFAULT;
810
811 result = ib_ucm_alloc_data(¶m.private_data, cmd.data, cmd.len);
812 if (result)
813 return result;
814
815 param.qp_num = cmd.qpn;
816 param.starting_psn = cmd.psn;
817 param.private_data_len = cmd.len;
818 param.responder_resources = cmd.responder_resources;
819 param.initiator_depth = cmd.initiator_depth;
820 param.failover_accepted = cmd.failover_accepted;
821 param.flow_control = cmd.flow_control;
822 param.rnr_retry_count = cmd.rnr_retry_count;
823 param.srq = cmd.srq;
824
825 ctx = ib_ucm_ctx_get(file, cmd.id);
826 if (!IS_ERR(ctx)) {
827 ctx->uid = cmd.uid;
828 result = ib_send_cm_rep(ctx->cm_id, ¶m);
829 ib_ucm_ctx_put(ctx);
830 } else
831 result = PTR_ERR(ctx);
832
833 kfree(param.private_data);
834 return result;
835}
836
837static ssize_t ib_ucm_send_private_data(struct ib_ucm_file *file,
838 const char __user *inbuf, int in_len,
839 int (*func)(struct ib_cm_id *cm_id,
840 const void *private_data,
841 u8 private_data_len))
842{
843 struct ib_ucm_private_data cmd;
844 struct ib_ucm_context *ctx;
845 const void *private_data = NULL;
846 int result;
847
848 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
849 return -EFAULT;
850
851 result = ib_ucm_alloc_data(&private_data, cmd.data, cmd.len);
852 if (result)
853 return result;
854
855 ctx = ib_ucm_ctx_get(file, cmd.id);
856 if (!IS_ERR(ctx)) {
857 result = func(ctx->cm_id, private_data, cmd.len);
858 ib_ucm_ctx_put(ctx);
859 } else
860 result = PTR_ERR(ctx);
861
862 kfree(private_data);
863 return result;
864}
865
866static ssize_t ib_ucm_send_rtu(struct ib_ucm_file *file,
867 const char __user *inbuf,
868 int in_len, int out_len)
869{
870 return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_rtu);
871}
872
873static ssize_t ib_ucm_send_dreq(struct ib_ucm_file *file,
874 const char __user *inbuf,
875 int in_len, int out_len)
876{
877 return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_dreq);
878}
879
880static ssize_t ib_ucm_send_drep(struct ib_ucm_file *file,
881 const char __user *inbuf,
882 int in_len, int out_len)
883{
884 return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_drep);
885}
886
887static ssize_t ib_ucm_send_info(struct ib_ucm_file *file,
888 const char __user *inbuf, int in_len,
889 int (*func)(struct ib_cm_id *cm_id,
890 int status,
891 const void *info,
892 u8 info_len,
893 const void *data,
894 u8 data_len))
895{
896 struct ib_ucm_context *ctx;
897 struct ib_ucm_info cmd;
898 const void *data = NULL;
899 const void *info = NULL;
900 int result;
901
902 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
903 return -EFAULT;
904
905 result = ib_ucm_alloc_data(&data, cmd.data, cmd.data_len);
906 if (result)
907 goto done;
908
909 result = ib_ucm_alloc_data(&info, cmd.info, cmd.info_len);
910 if (result)
911 goto done;
912
913 ctx = ib_ucm_ctx_get(file, cmd.id);
914 if (!IS_ERR(ctx)) {
915 result = func(ctx->cm_id, cmd.status, info, cmd.info_len,
916 data, cmd.data_len);
917 ib_ucm_ctx_put(ctx);
918 } else
919 result = PTR_ERR(ctx);
920
921done:
922 kfree(data);
923 kfree(info);
924 return result;
925}
926
927static ssize_t ib_ucm_send_rej(struct ib_ucm_file *file,
928 const char __user *inbuf,
929 int in_len, int out_len)
930{
931 return ib_ucm_send_info(file, inbuf, in_len, (void *)ib_send_cm_rej);
932}
933
934static ssize_t ib_ucm_send_apr(struct ib_ucm_file *file,
935 const char __user *inbuf,
936 int in_len, int out_len)
937{
938 return ib_ucm_send_info(file, inbuf, in_len, (void *)ib_send_cm_apr);
939}
940
941static ssize_t ib_ucm_send_mra(struct ib_ucm_file *file,
942 const char __user *inbuf,
943 int in_len, int out_len)
944{
945 struct ib_ucm_context *ctx;
946 struct ib_ucm_mra cmd;
947 const void *data = NULL;
948 int result;
949
950 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
951 return -EFAULT;
952
953 result = ib_ucm_alloc_data(&data, cmd.data, cmd.len);
954 if (result)
955 return result;
956
957 ctx = ib_ucm_ctx_get(file, cmd.id);
958 if (!IS_ERR(ctx)) {
959 result = ib_send_cm_mra(ctx->cm_id, cmd.timeout, data, cmd.len);
960 ib_ucm_ctx_put(ctx);
961 } else
962 result = PTR_ERR(ctx);
963
964 kfree(data);
965 return result;
966}
967
968static ssize_t ib_ucm_send_lap(struct ib_ucm_file *file,
969 const char __user *inbuf,
970 int in_len, int out_len)
971{
972 struct ib_ucm_context *ctx;
973 struct ib_sa_path_rec *path = NULL;
974 struct ib_ucm_lap cmd;
975 const void *data = NULL;
976 int result;
977
978 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
979 return -EFAULT;
980
981 result = ib_ucm_alloc_data(&data, cmd.data, cmd.len);
982 if (result)
983 goto done;
984
985 result = ib_ucm_path_get(&path, cmd.path);
986 if (result)
987 goto done;
988
989 ctx = ib_ucm_ctx_get(file, cmd.id);
990 if (!IS_ERR(ctx)) {
991 result = ib_send_cm_lap(ctx->cm_id, path, data, cmd.len);
992 ib_ucm_ctx_put(ctx);
993 } else
994 result = PTR_ERR(ctx);
995
996done:
997 kfree(data);
998 kfree(path);
999 return result;
1000}
1001
1002static ssize_t ib_ucm_send_sidr_req(struct ib_ucm_file *file,
1003 const char __user *inbuf,
1004 int in_len, int out_len)
1005{
1006 struct ib_cm_sidr_req_param param;
1007 struct ib_ucm_context *ctx;
1008 struct ib_ucm_sidr_req cmd;
1009 int result;
1010
1011 param.private_data = NULL;
1012 param.path = NULL;
1013
1014 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1015 return -EFAULT;
1016
1017 result = ib_ucm_alloc_data(¶m.private_data, cmd.data, cmd.len);
1018 if (result)
1019 goto done;
1020
1021 result = ib_ucm_path_get(¶m.path, cmd.path);
1022 if (result)
1023 goto done;
1024
1025 param.private_data_len = cmd.len;
1026 param.service_id = cmd.sid;
1027 param.timeout_ms = cmd.timeout;
1028 param.max_cm_retries = cmd.max_cm_retries;
1029
1030 ctx = ib_ucm_ctx_get(file, cmd.id);
1031 if (!IS_ERR(ctx)) {
1032 result = ib_send_cm_sidr_req(ctx->cm_id, ¶m);
1033 ib_ucm_ctx_put(ctx);
1034 } else
1035 result = PTR_ERR(ctx);
1036
1037done:
1038 kfree(param.private_data);
1039 kfree(param.path);
1040 return result;
1041}
1042
1043static ssize_t ib_ucm_send_sidr_rep(struct ib_ucm_file *file,
1044 const char __user *inbuf,
1045 int in_len, int out_len)
1046{
1047 struct ib_cm_sidr_rep_param param;
1048 struct ib_ucm_sidr_rep cmd;
1049 struct ib_ucm_context *ctx;
1050 int result;
1051
1052 param.info = NULL;
1053
1054 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1055 return -EFAULT;
1056
1057 result = ib_ucm_alloc_data(¶m.private_data,
1058 cmd.data, cmd.data_len);
1059 if (result)
1060 goto done;
1061
1062 result = ib_ucm_alloc_data(¶m.info, cmd.info, cmd.info_len);
1063 if (result)
1064 goto done;
1065
1066 param.qp_num = cmd.qpn;
1067 param.qkey = cmd.qkey;
1068 param.status = cmd.status;
1069 param.info_length = cmd.info_len;
1070 param.private_data_len = cmd.data_len;
1071
1072 ctx = ib_ucm_ctx_get(file, cmd.id);
1073 if (!IS_ERR(ctx)) {
1074 result = ib_send_cm_sidr_rep(ctx->cm_id, ¶m);
1075 ib_ucm_ctx_put(ctx);
1076 } else
1077 result = PTR_ERR(ctx);
1078
1079done:
1080 kfree(param.private_data);
1081 kfree(param.info);
1082 return result;
1083}
1084
1085static ssize_t (*ucm_cmd_table[])(struct ib_ucm_file *file,
1086 const char __user *inbuf,
1087 int in_len, int out_len) = {
1088 [IB_USER_CM_CMD_CREATE_ID] = ib_ucm_create_id,
1089 [IB_USER_CM_CMD_DESTROY_ID] = ib_ucm_destroy_id,
1090 [IB_USER_CM_CMD_ATTR_ID] = ib_ucm_attr_id,
1091 [IB_USER_CM_CMD_LISTEN] = ib_ucm_listen,
1092 [IB_USER_CM_CMD_NOTIFY] = ib_ucm_notify,
1093 [IB_USER_CM_CMD_SEND_REQ] = ib_ucm_send_req,
1094 [IB_USER_CM_CMD_SEND_REP] = ib_ucm_send_rep,
1095 [IB_USER_CM_CMD_SEND_RTU] = ib_ucm_send_rtu,
1096 [IB_USER_CM_CMD_SEND_DREQ] = ib_ucm_send_dreq,
1097 [IB_USER_CM_CMD_SEND_DREP] = ib_ucm_send_drep,
1098 [IB_USER_CM_CMD_SEND_REJ] = ib_ucm_send_rej,
1099 [IB_USER_CM_CMD_SEND_MRA] = ib_ucm_send_mra,
1100 [IB_USER_CM_CMD_SEND_LAP] = ib_ucm_send_lap,
1101 [IB_USER_CM_CMD_SEND_APR] = ib_ucm_send_apr,
1102 [IB_USER_CM_CMD_SEND_SIDR_REQ] = ib_ucm_send_sidr_req,
1103 [IB_USER_CM_CMD_SEND_SIDR_REP] = ib_ucm_send_sidr_rep,
1104 [IB_USER_CM_CMD_EVENT] = ib_ucm_event,
1105 [IB_USER_CM_CMD_INIT_QP_ATTR] = ib_ucm_init_qp_attr,
1106};
1107
1108static ssize_t ib_ucm_write(struct file *filp, const char __user *buf,
1109 size_t len, loff_t *pos)
1110{
1111 struct ib_ucm_file *file = filp->private_data;
1112 struct ib_ucm_cmd_hdr hdr;
1113 ssize_t result;
1114
1115 if (len < sizeof(hdr))
1116 return -EINVAL;
1117
1118 if (copy_from_user(&hdr, buf, sizeof(hdr)))
1119 return -EFAULT;
1120
1121 if (hdr.cmd >= ARRAY_SIZE(ucm_cmd_table))
1122 return -EINVAL;
1123
1124 if (hdr.in + sizeof(hdr) > len)
1125 return -EINVAL;
1126
1127 result = ucm_cmd_table[hdr.cmd](file, buf + sizeof(hdr),
1128 hdr.in, hdr.out);
1129 if (!result)
1130 result = len;
1131
1132 return result;
1133}
1134
1135static unsigned int ib_ucm_poll(struct file *filp,
1136 struct poll_table_struct *wait)
1137{
1138 struct ib_ucm_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->events))
1144 mask = POLLIN | POLLRDNORM;
1145
1146 return mask;
1147}
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157static int ib_ucm_open(struct inode *inode, struct file *filp)
1158{
1159 struct ib_ucm_file *file;
1160
1161 file = kmalloc(sizeof(*file), GFP_KERNEL);
1162 if (!file)
1163 return -ENOMEM;
1164
1165 INIT_LIST_HEAD(&file->events);
1166 INIT_LIST_HEAD(&file->ctxs);
1167 init_waitqueue_head(&file->poll_wait);
1168
1169 mutex_init(&file->file_mutex);
1170
1171 filp->private_data = file;
1172 file->filp = filp;
1173 file->device = container_of(inode->i_cdev, struct ib_ucm_device, cdev);
1174
1175 return nonseekable_open(inode, filp);
1176}
1177
1178static int ib_ucm_close(struct inode *inode, struct file *filp)
1179{
1180 struct ib_ucm_file *file = filp->private_data;
1181 struct ib_ucm_context *ctx;
1182
1183 mutex_lock(&file->file_mutex);
1184 while (!list_empty(&file->ctxs)) {
1185 ctx = list_entry(file->ctxs.next,
1186 struct ib_ucm_context, file_list);
1187 mutex_unlock(&file->file_mutex);
1188
1189 mutex_lock(&ctx_id_mutex);
1190 idr_remove(&ctx_id_table, ctx->id);
1191 mutex_unlock(&ctx_id_mutex);
1192
1193 ib_destroy_cm_id(ctx->cm_id);
1194 ib_ucm_cleanup_events(ctx);
1195 kfree(ctx);
1196
1197 mutex_lock(&file->file_mutex);
1198 }
1199 mutex_unlock(&file->file_mutex);
1200 kfree(file);
1201 return 0;
1202}
1203
1204static void ib_ucm_release_dev(struct device *dev)
1205{
1206 struct ib_ucm_device *ucm_dev;
1207
1208 ucm_dev = container_of(dev, struct ib_ucm_device, dev);
1209 cdev_del(&ucm_dev->cdev);
1210 if (ucm_dev->devnum < IB_UCM_MAX_DEVICES)
1211 clear_bit(ucm_dev->devnum, dev_map);
1212 else
1213 clear_bit(ucm_dev->devnum - IB_UCM_MAX_DEVICES, dev_map);
1214 kfree(ucm_dev);
1215}
1216
1217static const struct file_operations ucm_fops = {
1218 .owner = THIS_MODULE,
1219 .open = ib_ucm_open,
1220 .release = ib_ucm_close,
1221 .write = ib_ucm_write,
1222 .poll = ib_ucm_poll,
1223 .llseek = no_llseek,
1224};
1225
1226static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
1227 char *buf)
1228{
1229 struct ib_ucm_device *ucm_dev;
1230
1231 ucm_dev = container_of(dev, struct ib_ucm_device, dev);
1232 return sprintf(buf, "%s\n", ucm_dev->ib_dev->name);
1233}
1234static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1235
1236static dev_t overflow_maj;
1237static DECLARE_BITMAP(overflow_map, IB_UCM_MAX_DEVICES);
1238static int find_overflow_devnum(void)
1239{
1240 int ret;
1241
1242 if (!overflow_maj) {
1243 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UCM_MAX_DEVICES,
1244 "infiniband_cm");
1245 if (ret) {
1246 printk(KERN_ERR "ucm: couldn't register dynamic device number\n");
1247 return ret;
1248 }
1249 }
1250
1251 ret = find_first_zero_bit(overflow_map, IB_UCM_MAX_DEVICES);
1252 if (ret >= IB_UCM_MAX_DEVICES)
1253 return -1;
1254
1255 return ret;
1256}
1257
1258static void ib_ucm_add_one(struct ib_device *device)
1259{
1260 int devnum;
1261 dev_t base;
1262 struct ib_ucm_device *ucm_dev;
1263
1264 if (!device->alloc_ucontext ||
1265 rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1266 return;
1267
1268 ucm_dev = kzalloc(sizeof *ucm_dev, GFP_KERNEL);
1269 if (!ucm_dev)
1270 return;
1271
1272 ucm_dev->ib_dev = device;
1273
1274 devnum = find_first_zero_bit(dev_map, IB_UCM_MAX_DEVICES);
1275 if (devnum >= IB_UCM_MAX_DEVICES) {
1276 devnum = find_overflow_devnum();
1277 if (devnum < 0)
1278 goto err;
1279
1280 ucm_dev->devnum = devnum + IB_UCM_MAX_DEVICES;
1281 base = devnum + overflow_maj;
1282 set_bit(devnum, overflow_map);
1283 } else {
1284 ucm_dev->devnum = devnum;
1285 base = devnum + IB_UCM_BASE_DEV;
1286 set_bit(devnum, dev_map);
1287 }
1288
1289 cdev_init(&ucm_dev->cdev, &ucm_fops);
1290 ucm_dev->cdev.owner = THIS_MODULE;
1291 kobject_set_name(&ucm_dev->cdev.kobj, "ucm%d", ucm_dev->devnum);
1292 if (cdev_add(&ucm_dev->cdev, base, 1))
1293 goto err;
1294
1295 ucm_dev->dev.class = &cm_class;
1296 ucm_dev->dev.parent = device->dma_device;
1297 ucm_dev->dev.devt = ucm_dev->cdev.dev;
1298 ucm_dev->dev.release = ib_ucm_release_dev;
1299 dev_set_name(&ucm_dev->dev, "ucm%d", ucm_dev->devnum);
1300 if (device_register(&ucm_dev->dev))
1301 goto err_cdev;
1302
1303 if (device_create_file(&ucm_dev->dev, &dev_attr_ibdev))
1304 goto err_dev;
1305
1306 ib_set_client_data(device, &ucm_client, ucm_dev);
1307 return;
1308
1309err_dev:
1310 device_unregister(&ucm_dev->dev);
1311err_cdev:
1312 cdev_del(&ucm_dev->cdev);
1313 if (ucm_dev->devnum < IB_UCM_MAX_DEVICES)
1314 clear_bit(devnum, dev_map);
1315 else
1316 clear_bit(devnum, overflow_map);
1317err:
1318 kfree(ucm_dev);
1319 return;
1320}
1321
1322static void ib_ucm_remove_one(struct ib_device *device)
1323{
1324 struct ib_ucm_device *ucm_dev = ib_get_client_data(device, &ucm_client);
1325
1326 if (!ucm_dev)
1327 return;
1328
1329 device_unregister(&ucm_dev->dev);
1330}
1331
1332static CLASS_ATTR_STRING(abi_version, S_IRUGO,
1333 __stringify(IB_USER_CM_ABI_VERSION));
1334
1335static int __init ib_ucm_init(void)
1336{
1337 int ret;
1338
1339 ret = register_chrdev_region(IB_UCM_BASE_DEV, IB_UCM_MAX_DEVICES,
1340 "infiniband_cm");
1341 if (ret) {
1342 printk(KERN_ERR "ucm: couldn't register device number\n");
1343 goto error1;
1344 }
1345
1346 ret = class_create_file(&cm_class, &class_attr_abi_version.attr);
1347 if (ret) {
1348 printk(KERN_ERR "ucm: couldn't create abi_version attribute\n");
1349 goto error2;
1350 }
1351
1352 ret = ib_register_client(&ucm_client);
1353 if (ret) {
1354 printk(KERN_ERR "ucm: couldn't register client\n");
1355 goto error3;
1356 }
1357 return 0;
1358
1359error3:
1360 class_remove_file(&cm_class, &class_attr_abi_version.attr);
1361error2:
1362 unregister_chrdev_region(IB_UCM_BASE_DEV, IB_UCM_MAX_DEVICES);
1363error1:
1364 return ret;
1365}
1366
1367static void __exit ib_ucm_cleanup(void)
1368{
1369 ib_unregister_client(&ucm_client);
1370 class_remove_file(&cm_class, &class_attr_abi_version.attr);
1371 unregister_chrdev_region(IB_UCM_BASE_DEV, IB_UCM_MAX_DEVICES);
1372 if (overflow_maj)
1373 unregister_chrdev_region(overflow_maj, IB_UCM_MAX_DEVICES);
1374 idr_destroy(&ctx_id_table);
1375}
1376
1377module_init(ib_ucm_init);
1378module_exit(ib_ucm_cleanup);
1379
