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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
110extern struct class cm_class;
111
112#define IB_UCM_BASE_DEV MKDEV(IB_UCM_MAJOR, IB_UCM_BASE_MINOR)
113
114static void ib_ucm_add_one(struct ib_device *device);
115static void ib_ucm_remove_one(struct ib_device *device);
116
117static struct ib_client ucm_client = {
118 .name = "ucm",
119 .add = ib_ucm_add_one,
120 .remove = ib_ucm_remove_one
121};
122
123static DEFINE_MUTEX(ctx_id_mutex);
124static DEFINE_IDR(ctx_id_table);
125static DECLARE_BITMAP(dev_map, IB_UCM_MAX_DEVICES);
126
127static struct ib_ucm_context *ib_ucm_ctx_get(struct ib_ucm_file *file, int id)
128{
129 struct ib_ucm_context *ctx;
130
131 mutex_lock(&ctx_id_mutex);
132 ctx = idr_find(&ctx_id_table, id);
133 if (!ctx)
134 ctx = ERR_PTR(-ENOENT);
135 else if (ctx->file != file)
136 ctx = ERR_PTR(-EINVAL);
137 else
138 atomic_inc(&ctx->ref);
139 mutex_unlock(&ctx_id_mutex);
140
141 return ctx;
142}
143
144static void ib_ucm_ctx_put(struct ib_ucm_context *ctx)
145{
146 if (atomic_dec_and_test(&ctx->ref))
147 complete(&ctx->comp);
148}
149
150static inline int ib_ucm_new_cm_id(int event)
151{
152 return event == IB_CM_REQ_RECEIVED || event == IB_CM_SIDR_REQ_RECEIVED;
153}
154
155static void ib_ucm_cleanup_events(struct ib_ucm_context *ctx)
156{
157 struct ib_ucm_event *uevent;
158
159 mutex_lock(&ctx->file->file_mutex);
160 list_del(&ctx->file_list);
161 while (!list_empty(&ctx->events)) {
162
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);
168
169
170 if (ib_ucm_new_cm_id(uevent->resp.event))
171 ib_destroy_cm_id(uevent->cm_id);
172
173 kfree(uevent);
174 mutex_lock(&ctx->file->file_mutex);
175 }
176 mutex_unlock(&ctx->file->file_mutex);
177}
178
179static struct ib_ucm_context *ib_ucm_ctx_alloc(struct ib_ucm_file *file)
180{
181 struct ib_ucm_context *ctx;
182 int result;
183
184 ctx = kzalloc(sizeof *ctx, GFP_KERNEL);
185 if (!ctx)
186 return NULL;
187
188 atomic_set(&ctx->ref, 1);
189 init_completion(&ctx->comp);
190 ctx->file = file;
191 INIT_LIST_HEAD(&ctx->events);
192
193 do {
194 result = idr_pre_get(&ctx_id_table, GFP_KERNEL);
195 if (!result)
196 goto error;
197
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);
202
203 if (result)
204 goto error;
205
206 list_add_tail(&ctx->file_list, &file->ctxs);
207 return ctx;
208
209error:
210 kfree(ctx);
211 return NULL;
212}
213
214static void ib_ucm_event_req_get(struct ib_ucm_req_event_resp *ureq,
215 struct ib_cm_req_event_param *kreq)
216{
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;
231
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);
236}
237
238static void ib_ucm_event_rep_get(struct ib_ucm_rep_event_resp *urep,
239 struct ib_cm_rep_event_param *krep)
240{
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;
252}
253
254static void ib_ucm_event_sidr_rep_get(struct ib_ucm_sidr_rep_event_resp *urep,
255 struct ib_cm_sidr_rep_event_param *krep)
256{
257 urep->status = krep->status;
258 urep->qkey = krep->qkey;
259 urep->qpn = krep->qpn;
260};
261
262static int ib_ucm_event_process(struct ib_cm_event *evt,
263 struct ib_ucm_event *uvt)
264{
265 void *info = NULL;
266
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);
275 break;
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;
280 break;
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;
284 break;
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;
288 break;
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;
292 break;
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;
297 break;
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;
303 break;
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;
309 break;
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;
315 break;
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;
322 break;
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;
329 break;
330 default:
331 uvt->resp.u.send_status = evt->param.send_status;
332 break;
333 }
334
335 if (uvt->data_len) {
336 uvt->data = kmemdup(evt->private_data, uvt->data_len, GFP_KERNEL);
337 if (!uvt->data)
338 goto err1;
339
340 uvt->resp.present |= IB_UCM_PRES_DATA;
341 }
342
343 if (uvt->info_len) {
344 uvt->info = kmemdup(info, uvt->info_len, GFP_KERNEL);
345 if (!uvt->info)
346 goto err2;
347
348 uvt->resp.present |= IB_UCM_PRES_INFO;
349 }
350 return 0;
351
352err2:
353 kfree(uvt->data);
354err1:
355 return -ENOMEM;
356}
357
358static int ib_ucm_event_handler(struct ib_cm_id *cm_id,
359 struct ib_cm_event *event)
360{
361 struct ib_ucm_event *uevent;
362 struct ib_ucm_context *ctx;
363 int result = 0;
364
365 ctx = cm_id->context;
366
367 uevent = kzalloc(sizeof *uevent, GFP_KERNEL);
368 if (!uevent)
369 goto err1;
370
371 uevent->ctx = ctx;
372 uevent->cm_id = cm_id;
373 uevent->resp.uid = ctx->uid;
374 uevent->resp.id = ctx->id;
375 uevent->resp.event = event->event;
376
377 result = ib_ucm_event_process(event, uevent);
378 if (result)
379 goto err2;
380
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);
386 return 0;
387
388err2:
389 kfree(uevent);
390err1:
391
392 return ib_ucm_new_cm_id(event->event);
393}
394
395static ssize_t ib_ucm_event(struct ib_ucm_file *file,
396 const char __user *inbuf,
397 int in_len, int out_len)
398{
399 struct ib_ucm_context *ctx;
400 struct ib_ucm_event_get cmd;
401 struct ib_ucm_event *uevent;
402 int result = 0;
403 DEFINE_WAIT(wait);
404
405 if (out_len < sizeof(struct ib_ucm_event_resp))
406 return -ENOSPC;
407
408 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
409 return -EFAULT;
410
411 mutex_lock(&file->file_mutex);
412 while (list_empty(&file->events)) {
413 mutex_unlock(&file->file_mutex);
414
415 if (file->filp->f_flags & O_NONBLOCK)
416 return -EAGAIN;
417
418 if (wait_event_interruptible(file->poll_wait,
419 !list_empty(&file->events)))
420 return -ERESTARTSYS;
421
422 mutex_lock(&file->file_mutex);
423 }
424
425 uevent = list_entry(file->events.next, struct ib_ucm_event, file_list);
426
427 if (ib_ucm_new_cm_id(uevent->resp.event)) {
428 ctx = ib_ucm_ctx_alloc(file);
429 if (!ctx) {
430 result = -ENOMEM;
431 goto done;
432 }
433
434 ctx->cm_id = uevent->cm_id;
435 ctx->cm_id->context = ctx;
436 uevent->resp.id = ctx->id;
437 }
438
439 if (copy_to_user((void __user *)(unsigned long)cmd.response,
440 &uevent->resp, sizeof(uevent->resp))) {
441 result = -EFAULT;
442 goto done;
443 }
444
445 if (uevent->data) {
446 if (cmd.data_len < uevent->data_len) {
447 result = -ENOMEM;
448 goto done;
449 }
450 if (copy_to_user((void __user *)(unsigned long)cmd.data,
451 uevent->data, uevent->data_len)) {
452 result = -EFAULT;
453 goto done;
454 }
455 }
456
457 if (uevent->info) {
458 if (cmd.info_len < uevent->info_len) {
459 result = -ENOMEM;
460 goto done;
461 }
462 if (copy_to_user((void __user *)(unsigned long)cmd.info,
463 uevent->info, uevent->info_len)) {
464 result = -EFAULT;
465 goto done;
466 }
467 }
468
469 list_del(&uevent->file_list);
470 list_del(&uevent->ctx_list);
471 uevent->ctx->events_reported++;
472
473 kfree(uevent->data);
474 kfree(uevent->info);
475 kfree(uevent);
476done:
477 mutex_unlock(&file->file_mutex);
478 return result;
479}
480
481static ssize_t ib_ucm_create_id(struct ib_ucm_file *file,
482 const char __user *inbuf,
483 int in_len, int out_len)
484{
485 struct ib_ucm_create_id cmd;
486 struct ib_ucm_create_id_resp resp;
487 struct ib_ucm_context *ctx;
488 int result;
489
490 if (out_len < sizeof(resp))
491 return -ENOSPC;
492
493 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
494 return -EFAULT;
495
496 mutex_lock(&file->file_mutex);
497 ctx = ib_ucm_ctx_alloc(file);
498 mutex_unlock(&file->file_mutex);
499 if (!ctx)
500 return -ENOMEM;
501
502 ctx->uid = cmd.uid;
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);
507 goto err1;
508 }
509
510 resp.id = ctx->id;
511 if (copy_to_user((void __user *)(unsigned long)cmd.response,
512 &resp, sizeof(resp))) {
513 result = -EFAULT;
514 goto err2;
515 }
516 return 0;
517
518err2:
519 ib_destroy_cm_id(ctx->cm_id);
520err1:
521 mutex_lock(&ctx_id_mutex);
522 idr_remove(&ctx_id_table, ctx->id);
523 mutex_unlock(&ctx_id_mutex);
524 kfree(ctx);
525 return result;
526}
527
528static ssize_t ib_ucm_destroy_id(struct ib_ucm_file *file,
529 const char __user *inbuf,
530 int in_len, int out_len)
531{
532 struct ib_ucm_destroy_id cmd;
533 struct ib_ucm_destroy_id_resp resp;
534 struct ib_ucm_context *ctx;
535 int result = 0;
536
537 if (out_len < sizeof(resp))
538 return -ENOSPC;
539
540 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
541 return -EFAULT;
542
543 mutex_lock(&ctx_id_mutex);
544 ctx = idr_find(&ctx_id_table, cmd.id);
545 if (!ctx)
546 ctx = ERR_PTR(-ENOENT);
547 else if (ctx->file != file)
548 ctx = ERR_PTR(-EINVAL);
549 else
550 idr_remove(&ctx_id_table, ctx->id);
551 mutex_unlock(&ctx_id_mutex);
552
553 if (IS_ERR(ctx))
554 return PTR_ERR(ctx);
555
556 ib_ucm_ctx_put(ctx);
557 wait_for_completion(&ctx->comp);
558
559
560 ib_destroy_cm_id(ctx->cm_id);
561
562 ib_ucm_cleanup_events(ctx);
563
564 resp.events_reported = ctx->events_reported;
565 if (copy_to_user((void __user *)(unsigned long)cmd.response,
566 &resp, sizeof(resp)))
567 result = -EFAULT;
568
569 kfree(ctx);
570 return result;
571}
572
573static ssize_t ib_ucm_attr_id(struct ib_ucm_file *file,
574 const char __user *inbuf,
575 int in_len, int out_len)
576{
577 struct ib_ucm_attr_id_resp resp;
578 struct ib_ucm_attr_id cmd;
579 struct ib_ucm_context *ctx;
580 int result = 0;
581
582 if (out_len < sizeof(resp))
583 return -ENOSPC;
584
585 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
586 return -EFAULT;
587
588 ctx = ib_ucm_ctx_get(file, cmd.id);
589 if (IS_ERR(ctx))
590 return PTR_ERR(ctx);
591
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;
596
597 if (copy_to_user((void __user *)(unsigned long)cmd.response,
598 &resp, sizeof(resp)))
599 result = -EFAULT;
600
601 ib_ucm_ctx_put(ctx);
602 return result;
603}
604
605static ssize_t ib_ucm_init_qp_attr(struct ib_ucm_file *file,
606 const char __user *inbuf,
607 int in_len, int out_len)
608{
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;
613 int result = 0;
614
615 if (out_len < sizeof(resp))
616 return -ENOSPC;
617
618 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
619 return -EFAULT;
620
621 ctx = ib_ucm_ctx_get(file, cmd.id);
622 if (IS_ERR(ctx))
623 return PTR_ERR(ctx);
624
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);
629 if (result)
630 goto out;
631
632 ib_copy_qp_attr_to_user(&resp, &qp_attr);
633
634 if (copy_to_user((void __user *)(unsigned long)cmd.response,
635 &resp, sizeof(resp)))
636 result = -EFAULT;
637
638out:
639 ib_ucm_ctx_put(ctx);
640 return result;
641}
642
643static int ucm_validate_listen(__be64 service_id, __be64 service_mask)
644{
645 service_id &= service_mask;
646
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))
649 return -EINVAL;
650
651 return 0;
652}
653
654static ssize_t ib_ucm_listen(struct ib_ucm_file *file,
655 const char __user *inbuf,
656 int in_len, int out_len)
657{
658 struct ib_ucm_listen cmd;
659 struct ib_ucm_context *ctx;
660 int result;
661
662 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
663 return -EFAULT;
664
665 ctx = ib_ucm_ctx_get(file, cmd.id);
666 if (IS_ERR(ctx))
667 return PTR_ERR(ctx);
668
669 result = ucm_validate_listen(cmd.service_id, cmd.service_mask);
670 if (result)
671 goto out;
672
673 result = ib_cm_listen(ctx->cm_id, cmd.service_id, cmd.service_mask,
674 NULL);
675out:
676 ib_ucm_ctx_put(ctx);
677 return result;
678}
679
680static ssize_t ib_ucm_notify(struct ib_ucm_file *file,
681 const char __user *inbuf,
682 int in_len, int out_len)
683{
684 struct ib_ucm_notify cmd;
685 struct ib_ucm_context *ctx;
686 int result;
687
688 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
689 return -EFAULT;
690
691 ctx = ib_ucm_ctx_get(file, cmd.id);
692 if (IS_ERR(ctx))
693 return PTR_ERR(ctx);
694
695 result = ib_cm_notify(ctx->cm_id, (enum ib_event_type) cmd.event);
696 ib_ucm_ctx_put(ctx);
697 return result;
698}
699
700static int ib_ucm_alloc_data(const void **dest, u64 src, u32 len)
701{
702 void *data;
703
704 *dest = NULL;
705
706 if (!len)
707 return 0;
708
709 data = memdup_user((void __user *)(unsigned long)src, len);
710 if (IS_ERR(data))
711 return PTR_ERR(data);
712
713 *dest = data;
714 return 0;
715}
716
717static int ib_ucm_path_get(struct ib_sa_path_rec **path, u64 src)
718{
719 struct ib_user_path_rec upath;
720 struct ib_sa_path_rec *sa_path;
721
722 *path = NULL;
723
724 if (!src)
725 return 0;
726
727 sa_path = kmalloc(sizeof(*sa_path), GFP_KERNEL);
728 if (!sa_path)
729 return -ENOMEM;
730
731 if (copy_from_user(&upath, (void __user *)(unsigned long)src,
732 sizeof(upath))) {
733
734 kfree(sa_path);
735 return -EFAULT;
736 }
737
738 ib_copy_path_rec_from_user(sa_path, &upath);
739 *path = sa_path;
740 return 0;
741}
742
743static ssize_t ib_ucm_send_req(struct ib_ucm_file *file,
744 const char __user *inbuf,
745 int in_len, int out_len)
746{
747 struct ib_cm_req_param param;
748 struct ib_ucm_context *ctx;
749 struct ib_ucm_req cmd;
750 int result;
751
752 param.private_data = NULL;
753 param.primary_path = NULL;
754 param.alternate_path = NULL;
755
756 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
757 return -EFAULT;
758
759 result = ib_ucm_alloc_data(¶m.private_data, cmd.data, cmd.len);
760 if (result)
761 goto done;
762
763 result = ib_ucm_path_get(¶m.primary_path, cmd.primary_path);
764 if (result)
765 goto done;
766
767 result = ib_ucm_path_get(¶m.alternate_path, cmd.alternate_path);
768 if (result)
769 goto done;
770
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;
785 param.srq = cmd.srq;
786
787 ctx = ib_ucm_ctx_get(file, cmd.id);
788 if (!IS_ERR(ctx)) {
789 result = ib_send_cm_req(ctx->cm_id, ¶m);
790 ib_ucm_ctx_put(ctx);
791 } else
792 result = PTR_ERR(ctx);
793
794done:
795 kfree(param.private_data);
796 kfree(param.primary_path);
797 kfree(param.alternate_path);
798 return result;
799}
800
801static ssize_t ib_ucm_send_rep(struct ib_ucm_file *file,
802 const char __user *inbuf,
803 int in_len, int out_len)
804{
805 struct ib_cm_rep_param param;
806 struct ib_ucm_context *ctx;
807 struct ib_ucm_rep cmd;
808 int result;
809
810 param.private_data = NULL;
811
812 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
813 return -EFAULT;
814
815 result = ib_ucm_alloc_data(¶m.private_data, cmd.data, cmd.len);
816 if (result)
817 return result;
818
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;
827 param.srq = cmd.srq;
828
829 ctx = ib_ucm_ctx_get(file, cmd.id);
830 if (!IS_ERR(ctx)) {
831 ctx->uid = cmd.uid;
832 result = ib_send_cm_rep(ctx->cm_id, ¶m);
833 ib_ucm_ctx_put(ctx);
834 } else
835 result = PTR_ERR(ctx);
836
837 kfree(param.private_data);
838 return result;
839}
840
841static 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))
846{
847 struct ib_ucm_private_data cmd;
848 struct ib_ucm_context *ctx;
849 const void *private_data = NULL;
850 int result;
851
852 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
853 return -EFAULT;
854
855 result = ib_ucm_alloc_data(&private_data, cmd.data, cmd.len);
856 if (result)
857 return result;
858
859 ctx = ib_ucm_ctx_get(file, cmd.id);
860 if (!IS_ERR(ctx)) {
861 result = func(ctx->cm_id, private_data, cmd.len);
862 ib_ucm_ctx_put(ctx);
863 } else
864 result = PTR_ERR(ctx);
865
866 kfree(private_data);
867 return result;
868}
869
870static ssize_t ib_ucm_send_rtu(struct ib_ucm_file *file,
871 const char __user *inbuf,
872 int in_len, int out_len)
873{
874 return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_rtu);
875}
876
877static ssize_t ib_ucm_send_dreq(struct ib_ucm_file *file,
878 const char __user *inbuf,
879 int in_len, int out_len)
880{
881 return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_dreq);
882}
883
884static ssize_t ib_ucm_send_drep(struct ib_ucm_file *file,
885 const char __user *inbuf,
886 int in_len, int out_len)
887{
888 return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_drep);
889}
890
891static 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,
894 int status,
895 const void *info,
896 u8 info_len,
897 const void *data,
898 u8 data_len))
899{
900 struct ib_ucm_context *ctx;
901 struct ib_ucm_info cmd;
902 const void *data = NULL;
903 const void *info = NULL;
904 int result;
905
906 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
907 return -EFAULT;
908
909 result = ib_ucm_alloc_data(&data, cmd.data, cmd.data_len);
910 if (result)
911 goto done;
912
913 result = ib_ucm_alloc_data(&info, cmd.info, cmd.info_len);
914 if (result)
915 goto done;
916
917 ctx = ib_ucm_ctx_get(file, cmd.id);
918 if (!IS_ERR(ctx)) {
919 result = func(ctx->cm_id, cmd.status, info, cmd.info_len,
920 data, cmd.data_len);
921 ib_ucm_ctx_put(ctx);
922 } else
923 result = PTR_ERR(ctx);
924
925done:
926 kfree(data);
927 kfree(info);
928 return result;
929}
930
931static ssize_t ib_ucm_send_rej(struct ib_ucm_file *file,
932 const char __user *inbuf,
933 int in_len, int out_len)
934{
935 return ib_ucm_send_info(file, inbuf, in_len, (void *)ib_send_cm_rej);
936}
937
938static ssize_t ib_ucm_send_apr(struct ib_ucm_file *file,
939 const char __user *inbuf,
940 int in_len, int out_len)
941{
942 return ib_ucm_send_info(file, inbuf, in_len, (void *)ib_send_cm_apr);
943}
944
945static ssize_t ib_ucm_send_mra(struct ib_ucm_file *file,
946 const char __user *inbuf,
947 int in_len, int out_len)
948{
949 struct ib_ucm_context *ctx;
950 struct ib_ucm_mra cmd;
951 const void *data = NULL;
952 int result;
953
954 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
955 return -EFAULT;
956
957 result = ib_ucm_alloc_data(&data, cmd.data, cmd.len);
958 if (result)
959 return result;
960
961 ctx = ib_ucm_ctx_get(file, cmd.id);
962 if (!IS_ERR(ctx)) {
963 result = ib_send_cm_mra(ctx->cm_id, cmd.timeout, data, cmd.len);
964 ib_ucm_ctx_put(ctx);
965 } else
966 result = PTR_ERR(ctx);
967
968 kfree(data);
969 return result;
970}
971
972static ssize_t ib_ucm_send_lap(struct ib_ucm_file *file,
973 const char __user *inbuf,
974 int in_len, int out_len)
975{
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;
980 int result;
981
982 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
983 return -EFAULT;
984
985 result = ib_ucm_alloc_data(&data, cmd.data, cmd.len);
986 if (result)
987 goto done;
988
989 result = ib_ucm_path_get(&path, cmd.path);
990 if (result)
991 goto done;
992
993 ctx = ib_ucm_ctx_get(file, cmd.id);
994 if (!IS_ERR(ctx)) {
995 result = ib_send_cm_lap(ctx->cm_id, path, data, cmd.len);
996 ib_ucm_ctx_put(ctx);
997 } else
998 result = PTR_ERR(ctx);
999
1000done:
1001 kfree(data);
1002 kfree(path);
1003 return result;
1004}
1005
1006static ssize_t ib_ucm_send_sidr_req(struct ib_ucm_file *file,
1007 const char __user *inbuf,
1008 int in_len, int out_len)
1009{
1010 struct ib_cm_sidr_req_param param;
1011 struct ib_ucm_context *ctx;
1012 struct ib_ucm_sidr_req cmd;
1013 int result;
1014
1015 param.private_data = NULL;
1016 param.path = NULL;
1017
1018 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1019 return -EFAULT;
1020
1021 result = ib_ucm_alloc_data(¶m.private_data, cmd.data, cmd.len);
1022 if (result)
1023 goto done;
1024
1025 result = ib_ucm_path_get(¶m.path, cmd.path);
1026 if (result)
1027 goto done;
1028
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;
1033
1034 ctx = ib_ucm_ctx_get(file, cmd.id);
1035 if (!IS_ERR(ctx)) {
1036 result = ib_send_cm_sidr_req(ctx->cm_id, ¶m);
1037 ib_ucm_ctx_put(ctx);
1038 } else
1039 result = PTR_ERR(ctx);
1040
1041done:
1042 kfree(param.private_data);
1043 kfree(param.path);
1044 return result;
1045}
1046
1047static ssize_t ib_ucm_send_sidr_rep(struct ib_ucm_file *file,
1048 const char __user *inbuf,
1049 int in_len, int out_len)
1050{
1051 struct ib_cm_sidr_rep_param param;
1052 struct ib_ucm_sidr_rep cmd;
1053 struct ib_ucm_context *ctx;
1054 int result;
1055
1056 param.info = NULL;
1057
1058 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1059 return -EFAULT;
1060
1061 result = ib_ucm_alloc_data(¶m.private_data,
1062 cmd.data, cmd.data_len);
1063 if (result)
1064 goto done;
1065
1066 result = ib_ucm_alloc_data(¶m.info, cmd.info, cmd.info_len);
1067 if (result)
1068 goto done;
1069
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;
1075
1076 ctx = ib_ucm_ctx_get(file, cmd.id);
1077 if (!IS_ERR(ctx)) {
1078 result = ib_send_cm_sidr_rep(ctx->cm_id, ¶m);
1079 ib_ucm_ctx_put(ctx);
1080 } else
1081 result = PTR_ERR(ctx);
1082
1083done:
1084 kfree(param.private_data);
1085 kfree(param.info);
1086 return result;
1087}
1088
1089static 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,
1110};
1111
1112static ssize_t ib_ucm_write(struct file *filp, const char __user *buf,
1113 size_t len, loff_t *pos)
1114{
1115 struct ib_ucm_file *file = filp->private_data;
1116 struct ib_ucm_cmd_hdr hdr;
1117 ssize_t result;
1118
1119 if (len < sizeof(hdr))
1120 return -EINVAL;
1121
1122 if (copy_from_user(&hdr, buf, sizeof(hdr)))
1123 return -EFAULT;
1124
1125 if (hdr.cmd >= ARRAY_SIZE(ucm_cmd_table))
1126 return -EINVAL;
1127
1128 if (hdr.in + sizeof(hdr) > len)
1129 return -EINVAL;
1130
1131 result = ucm_cmd_table[hdr.cmd](file, buf + sizeof(hdr),
1132 hdr.in, hdr.out);
1133 if (!result)
1134 result = len;
1135
1136 return result;
1137}
1138
1139static unsigned int ib_ucm_poll(struct file *filp,
1140 struct poll_table_struct *wait)
1141{
1142 struct ib_ucm_file *file = filp->private_data;
1143 unsigned int mask = 0;
1144
1145 poll_wait(filp, &file->poll_wait, wait);
1146
1147 if (!list_empty(&file->events))
1148 mask = POLLIN | POLLRDNORM;
1149
1150 return mask;
1151}
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161static int ib_ucm_open(struct inode *inode, struct file *filp)
1162{
1163 struct ib_ucm_file *file;
1164
1165 file = kmalloc(sizeof(*file), GFP_KERNEL);
1166 if (!file)
1167 return -ENOMEM;
1168
1169 INIT_LIST_HEAD(&file->events);
1170 INIT_LIST_HEAD(&file->ctxs);
1171 init_waitqueue_head(&file->poll_wait);
1172
1173 mutex_init(&file->file_mutex);
1174
1175 filp->private_data = file;
1176 file->filp = filp;
1177 file->device = container_of(inode->i_cdev, struct ib_ucm_device, cdev);
1178
1179 return nonseekable_open(inode, filp);
1180}
1181
1182static int ib_ucm_close(struct inode *inode, struct file *filp)
1183{
1184 struct ib_ucm_file *file = filp->private_data;
1185 struct ib_ucm_context *ctx;
1186
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);
1192
1193 mutex_lock(&ctx_id_mutex);
1194 idr_remove(&ctx_id_table, ctx->id);
1195 mutex_unlock(&ctx_id_mutex);
1196
1197 ib_destroy_cm_id(ctx->cm_id);
1198 ib_ucm_cleanup_events(ctx);
1199 kfree(ctx);
1200
1201 mutex_lock(&file->file_mutex);
1202 }
1203 mutex_unlock(&file->file_mutex);
1204 kfree(file);
1205 return 0;
1206}
1207
1208static void ib_ucm_release_dev(struct device *dev)
1209{
1210 struct ib_ucm_device *ucm_dev;
1211
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);
1216 else
1217 clear_bit(ucm_dev->devnum - IB_UCM_MAX_DEVICES, dev_map);
1218 kfree(ucm_dev);
1219}
1220
1221static 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,
1228};
1229
1230static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
1231 char *buf)
1232{
1233 struct ib_ucm_device *ucm_dev;
1234
1235 ucm_dev = container_of(dev, struct ib_ucm_device, dev);
1236 return sprintf(buf, "%s\n", ucm_dev->ib_dev->name);
1237}
1238static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1239
1240static dev_t overflow_maj;
1241static DECLARE_BITMAP(overflow_map, IB_UCM_MAX_DEVICES);
1242static int find_overflow_devnum(void)
1243{
1244 int ret;
1245
1246 if (!overflow_maj) {
1247 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UCM_MAX_DEVICES,
1248 "infiniband_cm");
1249 if (ret) {
1250 printk(KERN_ERR "ucm: couldn't register dynamic device number\n");
1251 return ret;
1252 }
1253 }
1254
1255 ret = find_first_zero_bit(overflow_map, IB_UCM_MAX_DEVICES);
1256 if (ret >= IB_UCM_MAX_DEVICES)
1257 return -1;
1258
1259 return ret;
1260}
1261
1262static void ib_ucm_add_one(struct ib_device *device)
1263{
1264 int devnum;
1265 dev_t base;
1266 struct ib_ucm_device *ucm_dev;
1267
1268 if (!device->alloc_ucontext ||
1269 rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1270 return;
1271
1272 ucm_dev = kzalloc(sizeof *ucm_dev, GFP_KERNEL);
1273 if (!ucm_dev)
1274 return;
1275
1276 ucm_dev->ib_dev = device;
1277
1278 devnum = find_first_zero_bit(dev_map, IB_UCM_MAX_DEVICES);
1279 if (devnum >= IB_UCM_MAX_DEVICES) {
1280 devnum = find_overflow_devnum();
1281 if (devnum < 0)
1282 goto err;
1283
1284 ucm_dev->devnum = devnum + IB_UCM_MAX_DEVICES;
1285 base = devnum + overflow_maj;
1286 set_bit(devnum, overflow_map);
1287 } else {
1288 ucm_dev->devnum = devnum;
1289 base = devnum + IB_UCM_BASE_DEV;
1290 set_bit(devnum, dev_map);
1291 }
1292
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))
1297 goto err;
1298
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))
1305 goto err_cdev;
1306
1307 if (device_create_file(&ucm_dev->dev, &dev_attr_ibdev))
1308 goto err_dev;
1309
1310 ib_set_client_data(device, &ucm_client, ucm_dev);
1311 return;
1312
1313err_dev:
1314 device_unregister(&ucm_dev->dev);
1315err_cdev:
1316 cdev_del(&ucm_dev->cdev);
1317 if (ucm_dev->devnum < IB_UCM_MAX_DEVICES)
1318 clear_bit(devnum, dev_map);
1319 else
1320 clear_bit(devnum, overflow_map);
1321err:
1322 kfree(ucm_dev);
1323 return;
1324}
1325
1326static void ib_ucm_remove_one(struct ib_device *device)
1327{
1328 struct ib_ucm_device *ucm_dev = ib_get_client_data(device, &ucm_client);
1329
1330 if (!ucm_dev)
1331 return;
1332
1333 device_unregister(&ucm_dev->dev);
1334}
1335
1336static CLASS_ATTR_STRING(abi_version, S_IRUGO,
1337 __stringify(IB_USER_CM_ABI_VERSION));
1338
1339static int __init ib_ucm_init(void)
1340{
1341 int ret;
1342
1343 ret = register_chrdev_region(IB_UCM_BASE_DEV, IB_UCM_MAX_DEVICES,
1344 "infiniband_cm");
1345 if (ret) {
1346 printk(KERN_ERR "ucm: couldn't register device number\n");
1347 goto error1;
1348 }
1349
1350 ret = class_create_file(&cm_class, &class_attr_abi_version.attr);
1351 if (ret) {
1352 printk(KERN_ERR "ucm: couldn't create abi_version attribute\n");
1353 goto error2;
1354 }
1355
1356 ret = ib_register_client(&ucm_client);
1357 if (ret) {
1358 printk(KERN_ERR "ucm: couldn't register client\n");
1359 goto error3;
1360 }
1361 return 0;
1362
1363error3:
1364 class_remove_file(&cm_class, &class_attr_abi_version.attr);
1365error2:
1366 unregister_chrdev_region(IB_UCM_BASE_DEV, IB_UCM_MAX_DEVICES);
1367error1:
1368 return ret;
1369}
1370
1371static void __exit ib_ucm_cleanup(void)
1372{
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);
1376 if (overflow_maj)
1377 unregister_chrdev_region(overflow_maj, IB_UCM_MAX_DEVICES);
1378 idr_destroy(&ctx_id_table);
1379}
1380
1381module_init(ib_ucm_init);
1382module_exit(ib_ucm_cleanup);
1383
