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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
180 ctx = kzalloc(sizeof *ctx, GFP_KERNEL);
181 if (!ctx)
182 return NULL;
183
184 atomic_set(&ctx->ref, 1);
185 init_completion(&ctx->comp);
186 ctx->file = file;
187 INIT_LIST_HEAD(&ctx->events);
188
189 mutex_lock(&ctx_id_mutex);
190 ctx->id = idr_alloc(&ctx_id_table, ctx, 0, 0, GFP_KERNEL);
191 mutex_unlock(&ctx_id_mutex);
192 if (ctx->id < 0)
193 goto error;
194
195 list_add_tail(&ctx->file_list, &file->ctxs);
196 return ctx;
197
198error:
199 kfree(ctx);
200 return NULL;
201}
202
203static void ib_ucm_event_req_get(struct ib_ucm_req_event_resp *ureq,
204 struct ib_cm_req_event_param *kreq)
205{
206 ureq->remote_ca_guid = kreq->remote_ca_guid;
207 ureq->remote_qkey = kreq->remote_qkey;
208 ureq->remote_qpn = kreq->remote_qpn;
209 ureq->qp_type = kreq->qp_type;
210 ureq->starting_psn = kreq->starting_psn;
211 ureq->responder_resources = kreq->responder_resources;
212 ureq->initiator_depth = kreq->initiator_depth;
213 ureq->local_cm_response_timeout = kreq->local_cm_response_timeout;
214 ureq->flow_control = kreq->flow_control;
215 ureq->remote_cm_response_timeout = kreq->remote_cm_response_timeout;
216 ureq->retry_count = kreq->retry_count;
217 ureq->rnr_retry_count = kreq->rnr_retry_count;
218 ureq->srq = kreq->srq;
219 ureq->port = kreq->port;
220
221 ib_copy_path_rec_to_user(&ureq->primary_path, kreq->primary_path);
222 if (kreq->alternate_path)
223 ib_copy_path_rec_to_user(&ureq->alternate_path,
224 kreq->alternate_path);
225}
226
227static void ib_ucm_event_rep_get(struct ib_ucm_rep_event_resp *urep,
228 struct ib_cm_rep_event_param *krep)
229{
230 urep->remote_ca_guid = krep->remote_ca_guid;
231 urep->remote_qkey = krep->remote_qkey;
232 urep->remote_qpn = krep->remote_qpn;
233 urep->starting_psn = krep->starting_psn;
234 urep->responder_resources = krep->responder_resources;
235 urep->initiator_depth = krep->initiator_depth;
236 urep->target_ack_delay = krep->target_ack_delay;
237 urep->failover_accepted = krep->failover_accepted;
238 urep->flow_control = krep->flow_control;
239 urep->rnr_retry_count = krep->rnr_retry_count;
240 urep->srq = krep->srq;
241}
242
243static void ib_ucm_event_sidr_rep_get(struct ib_ucm_sidr_rep_event_resp *urep,
244 struct ib_cm_sidr_rep_event_param *krep)
245{
246 urep->status = krep->status;
247 urep->qkey = krep->qkey;
248 urep->qpn = krep->qpn;
249};
250
251static int ib_ucm_event_process(struct ib_cm_event *evt,
252 struct ib_ucm_event *uvt)
253{
254 void *info = NULL;
255
256 switch (evt->event) {
257 case IB_CM_REQ_RECEIVED:
258 ib_ucm_event_req_get(&uvt->resp.u.req_resp,
259 &evt->param.req_rcvd);
260 uvt->data_len = IB_CM_REQ_PRIVATE_DATA_SIZE;
261 uvt->resp.present = IB_UCM_PRES_PRIMARY;
262 uvt->resp.present |= (evt->param.req_rcvd.alternate_path ?
263 IB_UCM_PRES_ALTERNATE : 0);
264 break;
265 case IB_CM_REP_RECEIVED:
266 ib_ucm_event_rep_get(&uvt->resp.u.rep_resp,
267 &evt->param.rep_rcvd);
268 uvt->data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
269 break;
270 case IB_CM_RTU_RECEIVED:
271 uvt->data_len = IB_CM_RTU_PRIVATE_DATA_SIZE;
272 uvt->resp.u.send_status = evt->param.send_status;
273 break;
274 case IB_CM_DREQ_RECEIVED:
275 uvt->data_len = IB_CM_DREQ_PRIVATE_DATA_SIZE;
276 uvt->resp.u.send_status = evt->param.send_status;
277 break;
278 case IB_CM_DREP_RECEIVED:
279 uvt->data_len = IB_CM_DREP_PRIVATE_DATA_SIZE;
280 uvt->resp.u.send_status = evt->param.send_status;
281 break;
282 case IB_CM_MRA_RECEIVED:
283 uvt->resp.u.mra_resp.timeout =
284 evt->param.mra_rcvd.service_timeout;
285 uvt->data_len = IB_CM_MRA_PRIVATE_DATA_SIZE;
286 break;
287 case IB_CM_REJ_RECEIVED:
288 uvt->resp.u.rej_resp.reason = evt->param.rej_rcvd.reason;
289 uvt->data_len = IB_CM_REJ_PRIVATE_DATA_SIZE;
290 uvt->info_len = evt->param.rej_rcvd.ari_length;
291 info = evt->param.rej_rcvd.ari;
292 break;
293 case IB_CM_LAP_RECEIVED:
294 ib_copy_path_rec_to_user(&uvt->resp.u.lap_resp.path,
295 evt->param.lap_rcvd.alternate_path);
296 uvt->data_len = IB_CM_LAP_PRIVATE_DATA_SIZE;
297 uvt->resp.present = IB_UCM_PRES_ALTERNATE;
298 break;
299 case IB_CM_APR_RECEIVED:
300 uvt->resp.u.apr_resp.status = evt->param.apr_rcvd.ap_status;
301 uvt->data_len = IB_CM_APR_PRIVATE_DATA_SIZE;
302 uvt->info_len = evt->param.apr_rcvd.info_len;
303 info = evt->param.apr_rcvd.apr_info;
304 break;
305 case IB_CM_SIDR_REQ_RECEIVED:
306 uvt->resp.u.sidr_req_resp.pkey =
307 evt->param.sidr_req_rcvd.pkey;
308 uvt->resp.u.sidr_req_resp.port =
309 evt->param.sidr_req_rcvd.port;
310 uvt->data_len = IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE;
311 break;
312 case IB_CM_SIDR_REP_RECEIVED:
313 ib_ucm_event_sidr_rep_get(&uvt->resp.u.sidr_rep_resp,
314 &evt->param.sidr_rep_rcvd);
315 uvt->data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE;
316 uvt->info_len = evt->param.sidr_rep_rcvd.info_len;
317 info = evt->param.sidr_rep_rcvd.info;
318 break;
319 default:
320 uvt->resp.u.send_status = evt->param.send_status;
321 break;
322 }
323
324 if (uvt->data_len) {
325 uvt->data = kmemdup(evt->private_data, uvt->data_len, GFP_KERNEL);
326 if (!uvt->data)
327 goto err1;
328
329 uvt->resp.present |= IB_UCM_PRES_DATA;
330 }
331
332 if (uvt->info_len) {
333 uvt->info = kmemdup(info, uvt->info_len, GFP_KERNEL);
334 if (!uvt->info)
335 goto err2;
336
337 uvt->resp.present |= IB_UCM_PRES_INFO;
338 }
339 return 0;
340
341err2:
342 kfree(uvt->data);
343err1:
344 return -ENOMEM;
345}
346
347static int ib_ucm_event_handler(struct ib_cm_id *cm_id,
348 struct ib_cm_event *event)
349{
350 struct ib_ucm_event *uevent;
351 struct ib_ucm_context *ctx;
352 int result = 0;
353
354 ctx = cm_id->context;
355
356 uevent = kzalloc(sizeof *uevent, GFP_KERNEL);
357 if (!uevent)
358 goto err1;
359
360 uevent->ctx = ctx;
361 uevent->cm_id = cm_id;
362 uevent->resp.uid = ctx->uid;
363 uevent->resp.id = ctx->id;
364 uevent->resp.event = event->event;
365
366 result = ib_ucm_event_process(event, uevent);
367 if (result)
368 goto err2;
369
370 mutex_lock(&ctx->file->file_mutex);
371 list_add_tail(&uevent->file_list, &ctx->file->events);
372 list_add_tail(&uevent->ctx_list, &ctx->events);
373 wake_up_interruptible(&ctx->file->poll_wait);
374 mutex_unlock(&ctx->file->file_mutex);
375 return 0;
376
377err2:
378 kfree(uevent);
379err1:
380
381 return ib_ucm_new_cm_id(event->event);
382}
383
384static ssize_t ib_ucm_event(struct ib_ucm_file *file,
385 const char __user *inbuf,
386 int in_len, int out_len)
387{
388 struct ib_ucm_context *ctx;
389 struct ib_ucm_event_get cmd;
390 struct ib_ucm_event *uevent;
391 int result = 0;
392
393 if (out_len < sizeof(struct ib_ucm_event_resp))
394 return -ENOSPC;
395
396 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
397 return -EFAULT;
398
399 mutex_lock(&file->file_mutex);
400 while (list_empty(&file->events)) {
401 mutex_unlock(&file->file_mutex);
402
403 if (file->filp->f_flags & O_NONBLOCK)
404 return -EAGAIN;
405
406 if (wait_event_interruptible(file->poll_wait,
407 !list_empty(&file->events)))
408 return -ERESTARTSYS;
409
410 mutex_lock(&file->file_mutex);
411 }
412
413 uevent = list_entry(file->events.next, struct ib_ucm_event, file_list);
414
415 if (ib_ucm_new_cm_id(uevent->resp.event)) {
416 ctx = ib_ucm_ctx_alloc(file);
417 if (!ctx) {
418 result = -ENOMEM;
419 goto done;
420 }
421
422 ctx->cm_id = uevent->cm_id;
423 ctx->cm_id->context = ctx;
424 uevent->resp.id = ctx->id;
425 }
426
427 if (copy_to_user((void __user *)(unsigned long)cmd.response,
428 &uevent->resp, sizeof(uevent->resp))) {
429 result = -EFAULT;
430 goto done;
431 }
432
433 if (uevent->data) {
434 if (cmd.data_len < uevent->data_len) {
435 result = -ENOMEM;
436 goto done;
437 }
438 if (copy_to_user((void __user *)(unsigned long)cmd.data,
439 uevent->data, uevent->data_len)) {
440 result = -EFAULT;
441 goto done;
442 }
443 }
444
445 if (uevent->info) {
446 if (cmd.info_len < uevent->info_len) {
447 result = -ENOMEM;
448 goto done;
449 }
450 if (copy_to_user((void __user *)(unsigned long)cmd.info,
451 uevent->info, uevent->info_len)) {
452 result = -EFAULT;
453 goto done;
454 }
455 }
456
457 list_del(&uevent->file_list);
458 list_del(&uevent->ctx_list);
459 uevent->ctx->events_reported++;
460
461 kfree(uevent->data);
462 kfree(uevent->info);
463 kfree(uevent);
464done:
465 mutex_unlock(&file->file_mutex);
466 return result;
467}
468
469static ssize_t ib_ucm_create_id(struct ib_ucm_file *file,
470 const char __user *inbuf,
471 int in_len, int out_len)
472{
473 struct ib_ucm_create_id cmd;
474 struct ib_ucm_create_id_resp resp;
475 struct ib_ucm_context *ctx;
476 int result;
477
478 if (out_len < sizeof(resp))
479 return -ENOSPC;
480
481 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
482 return -EFAULT;
483
484 mutex_lock(&file->file_mutex);
485 ctx = ib_ucm_ctx_alloc(file);
486 mutex_unlock(&file->file_mutex);
487 if (!ctx)
488 return -ENOMEM;
489
490 ctx->uid = cmd.uid;
491 ctx->cm_id = ib_create_cm_id(file->device->ib_dev,
492 ib_ucm_event_handler, ctx);
493 if (IS_ERR(ctx->cm_id)) {
494 result = PTR_ERR(ctx->cm_id);
495 goto err1;
496 }
497
498 resp.id = ctx->id;
499 if (copy_to_user((void __user *)(unsigned long)cmd.response,
500 &resp, sizeof(resp))) {
501 result = -EFAULT;
502 goto err2;
503 }
504 return 0;
505
506err2:
507 ib_destroy_cm_id(ctx->cm_id);
508err1:
509 mutex_lock(&ctx_id_mutex);
510 idr_remove(&ctx_id_table, ctx->id);
511 mutex_unlock(&ctx_id_mutex);
512 kfree(ctx);
513 return result;
514}
515
516static ssize_t ib_ucm_destroy_id(struct ib_ucm_file *file,
517 const char __user *inbuf,
518 int in_len, int out_len)
519{
520 struct ib_ucm_destroy_id cmd;
521 struct ib_ucm_destroy_id_resp resp;
522 struct ib_ucm_context *ctx;
523 int result = 0;
524
525 if (out_len < sizeof(resp))
526 return -ENOSPC;
527
528 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
529 return -EFAULT;
530
531 mutex_lock(&ctx_id_mutex);
532 ctx = idr_find(&ctx_id_table, cmd.id);
533 if (!ctx)
534 ctx = ERR_PTR(-ENOENT);
535 else if (ctx->file != file)
536 ctx = ERR_PTR(-EINVAL);
537 else
538 idr_remove(&ctx_id_table, ctx->id);
539 mutex_unlock(&ctx_id_mutex);
540
541 if (IS_ERR(ctx))
542 return PTR_ERR(ctx);
543
544 ib_ucm_ctx_put(ctx);
545 wait_for_completion(&ctx->comp);
546
547
548 ib_destroy_cm_id(ctx->cm_id);
549
550 ib_ucm_cleanup_events(ctx);
551
552 resp.events_reported = ctx->events_reported;
553 if (copy_to_user((void __user *)(unsigned long)cmd.response,
554 &resp, sizeof(resp)))
555 result = -EFAULT;
556
557 kfree(ctx);
558 return result;
559}
560
561static ssize_t ib_ucm_attr_id(struct ib_ucm_file *file,
562 const char __user *inbuf,
563 int in_len, int out_len)
564{
565 struct ib_ucm_attr_id_resp resp;
566 struct ib_ucm_attr_id cmd;
567 struct ib_ucm_context *ctx;
568 int result = 0;
569
570 if (out_len < sizeof(resp))
571 return -ENOSPC;
572
573 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
574 return -EFAULT;
575
576 ctx = ib_ucm_ctx_get(file, cmd.id);
577 if (IS_ERR(ctx))
578 return PTR_ERR(ctx);
579
580 resp.service_id = ctx->cm_id->service_id;
581 resp.service_mask = ctx->cm_id->service_mask;
582 resp.local_id = ctx->cm_id->local_id;
583 resp.remote_id = ctx->cm_id->remote_id;
584
585 if (copy_to_user((void __user *)(unsigned long)cmd.response,
586 &resp, sizeof(resp)))
587 result = -EFAULT;
588
589 ib_ucm_ctx_put(ctx);
590 return result;
591}
592
593static ssize_t ib_ucm_init_qp_attr(struct ib_ucm_file *file,
594 const char __user *inbuf,
595 int in_len, int out_len)
596{
597 struct ib_uverbs_qp_attr resp;
598 struct ib_ucm_init_qp_attr cmd;
599 struct ib_ucm_context *ctx;
600 struct ib_qp_attr qp_attr;
601 int result = 0;
602
603 if (out_len < sizeof(resp))
604 return -ENOSPC;
605
606 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
607 return -EFAULT;
608
609 ctx = ib_ucm_ctx_get(file, cmd.id);
610 if (IS_ERR(ctx))
611 return PTR_ERR(ctx);
612
613 resp.qp_attr_mask = 0;
614 memset(&qp_attr, 0, sizeof qp_attr);
615 qp_attr.qp_state = cmd.qp_state;
616 result = ib_cm_init_qp_attr(ctx->cm_id, &qp_attr, &resp.qp_attr_mask);
617 if (result)
618 goto out;
619
620 ib_copy_qp_attr_to_user(&resp, &qp_attr);
621
622 if (copy_to_user((void __user *)(unsigned long)cmd.response,
623 &resp, sizeof(resp)))
624 result = -EFAULT;
625
626out:
627 ib_ucm_ctx_put(ctx);
628 return result;
629}
630
631static int ucm_validate_listen(__be64 service_id, __be64 service_mask)
632{
633 service_id &= service_mask;
634
635 if (((service_id & IB_CMA_SERVICE_ID_MASK) == IB_CMA_SERVICE_ID) ||
636 ((service_id & IB_SDP_SERVICE_ID_MASK) == IB_SDP_SERVICE_ID))
637 return -EINVAL;
638
639 return 0;
640}
641
642static ssize_t ib_ucm_listen(struct ib_ucm_file *file,
643 const char __user *inbuf,
644 int in_len, int out_len)
645{
646 struct ib_ucm_listen cmd;
647 struct ib_ucm_context *ctx;
648 int result;
649
650 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
651 return -EFAULT;
652
653 ctx = ib_ucm_ctx_get(file, cmd.id);
654 if (IS_ERR(ctx))
655 return PTR_ERR(ctx);
656
657 result = ucm_validate_listen(cmd.service_id, cmd.service_mask);
658 if (result)
659 goto out;
660
661 result = ib_cm_listen(ctx->cm_id, cmd.service_id, cmd.service_mask,
662 NULL);
663out:
664 ib_ucm_ctx_put(ctx);
665 return result;
666}
667
668static ssize_t ib_ucm_notify(struct ib_ucm_file *file,
669 const char __user *inbuf,
670 int in_len, int out_len)
671{
672 struct ib_ucm_notify cmd;
673 struct ib_ucm_context *ctx;
674 int result;
675
676 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
677 return -EFAULT;
678
679 ctx = ib_ucm_ctx_get(file, cmd.id);
680 if (IS_ERR(ctx))
681 return PTR_ERR(ctx);
682
683 result = ib_cm_notify(ctx->cm_id, (enum ib_event_type) cmd.event);
684 ib_ucm_ctx_put(ctx);
685 return result;
686}
687
688static int ib_ucm_alloc_data(const void **dest, u64 src, u32 len)
689{
690 void *data;
691
692 *dest = NULL;
693
694 if (!len)
695 return 0;
696
697 data = memdup_user((void __user *)(unsigned long)src, len);
698 if (IS_ERR(data))
699 return PTR_ERR(data);
700
701 *dest = data;
702 return 0;
703}
704
705static int ib_ucm_path_get(struct ib_sa_path_rec **path, u64 src)
706{
707 struct ib_user_path_rec upath;
708 struct ib_sa_path_rec *sa_path;
709
710 *path = NULL;
711
712 if (!src)
713 return 0;
714
715 sa_path = kmalloc(sizeof(*sa_path), GFP_KERNEL);
716 if (!sa_path)
717 return -ENOMEM;
718
719 if (copy_from_user(&upath, (void __user *)(unsigned long)src,
720 sizeof(upath))) {
721
722 kfree(sa_path);
723 return -EFAULT;
724 }
725
726 ib_copy_path_rec_from_user(sa_path, &upath);
727 *path = sa_path;
728 return 0;
729}
730
731static ssize_t ib_ucm_send_req(struct ib_ucm_file *file,
732 const char __user *inbuf,
733 int in_len, int out_len)
734{
735 struct ib_cm_req_param param;
736 struct ib_ucm_context *ctx;
737 struct ib_ucm_req cmd;
738 int result;
739
740 param.private_data = NULL;
741 param.primary_path = NULL;
742 param.alternate_path = NULL;
743
744 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
745 return -EFAULT;
746
747 result = ib_ucm_alloc_data(¶m.private_data, cmd.data, cmd.len);
748 if (result)
749 goto done;
750
751 result = ib_ucm_path_get(¶m.primary_path, cmd.primary_path);
752 if (result)
753 goto done;
754
755 result = ib_ucm_path_get(¶m.alternate_path, cmd.alternate_path);
756 if (result)
757 goto done;
758
759 param.private_data_len = cmd.len;
760 param.service_id = cmd.sid;
761 param.qp_num = cmd.qpn;
762 param.qp_type = cmd.qp_type;
763 param.starting_psn = cmd.psn;
764 param.peer_to_peer = cmd.peer_to_peer;
765 param.responder_resources = cmd.responder_resources;
766 param.initiator_depth = cmd.initiator_depth;
767 param.remote_cm_response_timeout = cmd.remote_cm_response_timeout;
768 param.flow_control = cmd.flow_control;
769 param.local_cm_response_timeout = cmd.local_cm_response_timeout;
770 param.retry_count = cmd.retry_count;
771 param.rnr_retry_count = cmd.rnr_retry_count;
772 param.max_cm_retries = cmd.max_cm_retries;
773 param.srq = cmd.srq;
774
775 ctx = ib_ucm_ctx_get(file, cmd.id);
776 if (!IS_ERR(ctx)) {
777 result = ib_send_cm_req(ctx->cm_id, ¶m);
778 ib_ucm_ctx_put(ctx);
779 } else
780 result = PTR_ERR(ctx);
781
782done:
783 kfree(param.private_data);
784 kfree(param.primary_path);
785 kfree(param.alternate_path);
786 return result;
787}
788
789static ssize_t ib_ucm_send_rep(struct ib_ucm_file *file,
790 const char __user *inbuf,
791 int in_len, int out_len)
792{
793 struct ib_cm_rep_param param;
794 struct ib_ucm_context *ctx;
795 struct ib_ucm_rep cmd;
796 int result;
797
798 param.private_data = NULL;
799
800 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
801 return -EFAULT;
802
803 result = ib_ucm_alloc_data(¶m.private_data, cmd.data, cmd.len);
804 if (result)
805 return result;
806
807 param.qp_num = cmd.qpn;
808 param.starting_psn = cmd.psn;
809 param.private_data_len = cmd.len;
810 param.responder_resources = cmd.responder_resources;
811 param.initiator_depth = cmd.initiator_depth;
812 param.failover_accepted = cmd.failover_accepted;
813 param.flow_control = cmd.flow_control;
814 param.rnr_retry_count = cmd.rnr_retry_count;
815 param.srq = cmd.srq;
816
817 ctx = ib_ucm_ctx_get(file, cmd.id);
818 if (!IS_ERR(ctx)) {
819 ctx->uid = cmd.uid;
820 result = ib_send_cm_rep(ctx->cm_id, ¶m);
821 ib_ucm_ctx_put(ctx);
822 } else
823 result = PTR_ERR(ctx);
824
825 kfree(param.private_data);
826 return result;
827}
828
829static ssize_t ib_ucm_send_private_data(struct ib_ucm_file *file,
830 const char __user *inbuf, int in_len,
831 int (*func)(struct ib_cm_id *cm_id,
832 const void *private_data,
833 u8 private_data_len))
834{
835 struct ib_ucm_private_data cmd;
836 struct ib_ucm_context *ctx;
837 const void *private_data = NULL;
838 int result;
839
840 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
841 return -EFAULT;
842
843 result = ib_ucm_alloc_data(&private_data, cmd.data, cmd.len);
844 if (result)
845 return result;
846
847 ctx = ib_ucm_ctx_get(file, cmd.id);
848 if (!IS_ERR(ctx)) {
849 result = func(ctx->cm_id, private_data, cmd.len);
850 ib_ucm_ctx_put(ctx);
851 } else
852 result = PTR_ERR(ctx);
853
854 kfree(private_data);
855 return result;
856}
857
858static ssize_t ib_ucm_send_rtu(struct ib_ucm_file *file,
859 const char __user *inbuf,
860 int in_len, int out_len)
861{
862 return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_rtu);
863}
864
865static ssize_t ib_ucm_send_dreq(struct ib_ucm_file *file,
866 const char __user *inbuf,
867 int in_len, int out_len)
868{
869 return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_dreq);
870}
871
872static ssize_t ib_ucm_send_drep(struct ib_ucm_file *file,
873 const char __user *inbuf,
874 int in_len, int out_len)
875{
876 return ib_ucm_send_private_data(file, inbuf, in_len, ib_send_cm_drep);
877}
878
879static ssize_t ib_ucm_send_info(struct ib_ucm_file *file,
880 const char __user *inbuf, int in_len,
881 int (*func)(struct ib_cm_id *cm_id,
882 int status,
883 const void *info,
884 u8 info_len,
885 const void *data,
886 u8 data_len))
887{
888 struct ib_ucm_context *ctx;
889 struct ib_ucm_info cmd;
890 const void *data = NULL;
891 const void *info = NULL;
892 int result;
893
894 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
895 return -EFAULT;
896
897 result = ib_ucm_alloc_data(&data, cmd.data, cmd.data_len);
898 if (result)
899 goto done;
900
901 result = ib_ucm_alloc_data(&info, cmd.info, cmd.info_len);
902 if (result)
903 goto done;
904
905 ctx = ib_ucm_ctx_get(file, cmd.id);
906 if (!IS_ERR(ctx)) {
907 result = func(ctx->cm_id, cmd.status, info, cmd.info_len,
908 data, cmd.data_len);
909 ib_ucm_ctx_put(ctx);
910 } else
911 result = PTR_ERR(ctx);
912
913done:
914 kfree(data);
915 kfree(info);
916 return result;
917}
918
919static ssize_t ib_ucm_send_rej(struct ib_ucm_file *file,
920 const char __user *inbuf,
921 int in_len, int out_len)
922{
923 return ib_ucm_send_info(file, inbuf, in_len, (void *)ib_send_cm_rej);
924}
925
926static ssize_t ib_ucm_send_apr(struct ib_ucm_file *file,
927 const char __user *inbuf,
928 int in_len, int out_len)
929{
930 return ib_ucm_send_info(file, inbuf, in_len, (void *)ib_send_cm_apr);
931}
932
933static ssize_t ib_ucm_send_mra(struct ib_ucm_file *file,
934 const char __user *inbuf,
935 int in_len, int out_len)
936{
937 struct ib_ucm_context *ctx;
938 struct ib_ucm_mra cmd;
939 const void *data = NULL;
940 int result;
941
942 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
943 return -EFAULT;
944
945 result = ib_ucm_alloc_data(&data, cmd.data, cmd.len);
946 if (result)
947 return result;
948
949 ctx = ib_ucm_ctx_get(file, cmd.id);
950 if (!IS_ERR(ctx)) {
951 result = ib_send_cm_mra(ctx->cm_id, cmd.timeout, data, cmd.len);
952 ib_ucm_ctx_put(ctx);
953 } else
954 result = PTR_ERR(ctx);
955
956 kfree(data);
957 return result;
958}
959
960static ssize_t ib_ucm_send_lap(struct ib_ucm_file *file,
961 const char __user *inbuf,
962 int in_len, int out_len)
963{
964 struct ib_ucm_context *ctx;
965 struct ib_sa_path_rec *path = NULL;
966 struct ib_ucm_lap cmd;
967 const void *data = NULL;
968 int result;
969
970 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
971 return -EFAULT;
972
973 result = ib_ucm_alloc_data(&data, cmd.data, cmd.len);
974 if (result)
975 goto done;
976
977 result = ib_ucm_path_get(&path, cmd.path);
978 if (result)
979 goto done;
980
981 ctx = ib_ucm_ctx_get(file, cmd.id);
982 if (!IS_ERR(ctx)) {
983 result = ib_send_cm_lap(ctx->cm_id, path, data, cmd.len);
984 ib_ucm_ctx_put(ctx);
985 } else
986 result = PTR_ERR(ctx);
987
988done:
989 kfree(data);
990 kfree(path);
991 return result;
992}
993
994static ssize_t ib_ucm_send_sidr_req(struct ib_ucm_file *file,
995 const char __user *inbuf,
996 int in_len, int out_len)
997{
998 struct ib_cm_sidr_req_param param;
999 struct ib_ucm_context *ctx;
1000 struct ib_ucm_sidr_req cmd;
1001 int result;
1002
1003 param.private_data = NULL;
1004 param.path = NULL;
1005
1006 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1007 return -EFAULT;
1008
1009 result = ib_ucm_alloc_data(¶m.private_data, cmd.data, cmd.len);
1010 if (result)
1011 goto done;
1012
1013 result = ib_ucm_path_get(¶m.path, cmd.path);
1014 if (result)
1015 goto done;
1016
1017 param.private_data_len = cmd.len;
1018 param.service_id = cmd.sid;
1019 param.timeout_ms = cmd.timeout;
1020 param.max_cm_retries = cmd.max_cm_retries;
1021
1022 ctx = ib_ucm_ctx_get(file, cmd.id);
1023 if (!IS_ERR(ctx)) {
1024 result = ib_send_cm_sidr_req(ctx->cm_id, ¶m);
1025 ib_ucm_ctx_put(ctx);
1026 } else
1027 result = PTR_ERR(ctx);
1028
1029done:
1030 kfree(param.private_data);
1031 kfree(param.path);
1032 return result;
1033}
1034
1035static ssize_t ib_ucm_send_sidr_rep(struct ib_ucm_file *file,
1036 const char __user *inbuf,
1037 int in_len, int out_len)
1038{
1039 struct ib_cm_sidr_rep_param param;
1040 struct ib_ucm_sidr_rep cmd;
1041 struct ib_ucm_context *ctx;
1042 int result;
1043
1044 param.info = NULL;
1045
1046 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1047 return -EFAULT;
1048
1049 result = ib_ucm_alloc_data(¶m.private_data,
1050 cmd.data, cmd.data_len);
1051 if (result)
1052 goto done;
1053
1054 result = ib_ucm_alloc_data(¶m.info, cmd.info, cmd.info_len);
1055 if (result)
1056 goto done;
1057
1058 param.qp_num = cmd.qpn;
1059 param.qkey = cmd.qkey;
1060 param.status = cmd.status;
1061 param.info_length = cmd.info_len;
1062 param.private_data_len = cmd.data_len;
1063
1064 ctx = ib_ucm_ctx_get(file, cmd.id);
1065 if (!IS_ERR(ctx)) {
1066 result = ib_send_cm_sidr_rep(ctx->cm_id, ¶m);
1067 ib_ucm_ctx_put(ctx);
1068 } else
1069 result = PTR_ERR(ctx);
1070
1071done:
1072 kfree(param.private_data);
1073 kfree(param.info);
1074 return result;
1075}
1076
1077static ssize_t (*ucm_cmd_table[])(struct ib_ucm_file *file,
1078 const char __user *inbuf,
1079 int in_len, int out_len) = {
1080 [IB_USER_CM_CMD_CREATE_ID] = ib_ucm_create_id,
1081 [IB_USER_CM_CMD_DESTROY_ID] = ib_ucm_destroy_id,
1082 [IB_USER_CM_CMD_ATTR_ID] = ib_ucm_attr_id,
1083 [IB_USER_CM_CMD_LISTEN] = ib_ucm_listen,
1084 [IB_USER_CM_CMD_NOTIFY] = ib_ucm_notify,
1085 [IB_USER_CM_CMD_SEND_REQ] = ib_ucm_send_req,
1086 [IB_USER_CM_CMD_SEND_REP] = ib_ucm_send_rep,
1087 [IB_USER_CM_CMD_SEND_RTU] = ib_ucm_send_rtu,
1088 [IB_USER_CM_CMD_SEND_DREQ] = ib_ucm_send_dreq,
1089 [IB_USER_CM_CMD_SEND_DREP] = ib_ucm_send_drep,
1090 [IB_USER_CM_CMD_SEND_REJ] = ib_ucm_send_rej,
1091 [IB_USER_CM_CMD_SEND_MRA] = ib_ucm_send_mra,
1092 [IB_USER_CM_CMD_SEND_LAP] = ib_ucm_send_lap,
1093 [IB_USER_CM_CMD_SEND_APR] = ib_ucm_send_apr,
1094 [IB_USER_CM_CMD_SEND_SIDR_REQ] = ib_ucm_send_sidr_req,
1095 [IB_USER_CM_CMD_SEND_SIDR_REP] = ib_ucm_send_sidr_rep,
1096 [IB_USER_CM_CMD_EVENT] = ib_ucm_event,
1097 [IB_USER_CM_CMD_INIT_QP_ATTR] = ib_ucm_init_qp_attr,
1098};
1099
1100static ssize_t ib_ucm_write(struct file *filp, const char __user *buf,
1101 size_t len, loff_t *pos)
1102{
1103 struct ib_ucm_file *file = filp->private_data;
1104 struct ib_ucm_cmd_hdr hdr;
1105 ssize_t result;
1106
1107 if (len < sizeof(hdr))
1108 return -EINVAL;
1109
1110 if (copy_from_user(&hdr, buf, sizeof(hdr)))
1111 return -EFAULT;
1112
1113 if (hdr.cmd >= ARRAY_SIZE(ucm_cmd_table))
1114 return -EINVAL;
1115
1116 if (hdr.in + sizeof(hdr) > len)
1117 return -EINVAL;
1118
1119 result = ucm_cmd_table[hdr.cmd](file, buf + sizeof(hdr),
1120 hdr.in, hdr.out);
1121 if (!result)
1122 result = len;
1123
1124 return result;
1125}
1126
1127static unsigned int ib_ucm_poll(struct file *filp,
1128 struct poll_table_struct *wait)
1129{
1130 struct ib_ucm_file *file = filp->private_data;
1131 unsigned int mask = 0;
1132
1133 poll_wait(filp, &file->poll_wait, wait);
1134
1135 if (!list_empty(&file->events))
1136 mask = POLLIN | POLLRDNORM;
1137
1138 return mask;
1139}
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149static int ib_ucm_open(struct inode *inode, struct file *filp)
1150{
1151 struct ib_ucm_file *file;
1152
1153 file = kmalloc(sizeof(*file), GFP_KERNEL);
1154 if (!file)
1155 return -ENOMEM;
1156
1157 INIT_LIST_HEAD(&file->events);
1158 INIT_LIST_HEAD(&file->ctxs);
1159 init_waitqueue_head(&file->poll_wait);
1160
1161 mutex_init(&file->file_mutex);
1162
1163 filp->private_data = file;
1164 file->filp = filp;
1165 file->device = container_of(inode->i_cdev, struct ib_ucm_device, cdev);
1166
1167 return nonseekable_open(inode, filp);
1168}
1169
1170static int ib_ucm_close(struct inode *inode, struct file *filp)
1171{
1172 struct ib_ucm_file *file = filp->private_data;
1173 struct ib_ucm_context *ctx;
1174
1175 mutex_lock(&file->file_mutex);
1176 while (!list_empty(&file->ctxs)) {
1177 ctx = list_entry(file->ctxs.next,
1178 struct ib_ucm_context, file_list);
1179 mutex_unlock(&file->file_mutex);
1180
1181 mutex_lock(&ctx_id_mutex);
1182 idr_remove(&ctx_id_table, ctx->id);
1183 mutex_unlock(&ctx_id_mutex);
1184
1185 ib_destroy_cm_id(ctx->cm_id);
1186 ib_ucm_cleanup_events(ctx);
1187 kfree(ctx);
1188
1189 mutex_lock(&file->file_mutex);
1190 }
1191 mutex_unlock(&file->file_mutex);
1192 kfree(file);
1193 return 0;
1194}
1195
1196static void ib_ucm_release_dev(struct device *dev)
1197{
1198 struct ib_ucm_device *ucm_dev;
1199
1200 ucm_dev = container_of(dev, struct ib_ucm_device, dev);
1201 cdev_del(&ucm_dev->cdev);
1202 if (ucm_dev->devnum < IB_UCM_MAX_DEVICES)
1203 clear_bit(ucm_dev->devnum, dev_map);
1204 else
1205 clear_bit(ucm_dev->devnum - IB_UCM_MAX_DEVICES, dev_map);
1206 kfree(ucm_dev);
1207}
1208
1209static const struct file_operations ucm_fops = {
1210 .owner = THIS_MODULE,
1211 .open = ib_ucm_open,
1212 .release = ib_ucm_close,
1213 .write = ib_ucm_write,
1214 .poll = ib_ucm_poll,
1215 .llseek = no_llseek,
1216};
1217
1218static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
1219 char *buf)
1220{
1221 struct ib_ucm_device *ucm_dev;
1222
1223 ucm_dev = container_of(dev, struct ib_ucm_device, dev);
1224 return sprintf(buf, "%s\n", ucm_dev->ib_dev->name);
1225}
1226static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1227
1228static dev_t overflow_maj;
1229static DECLARE_BITMAP(overflow_map, IB_UCM_MAX_DEVICES);
1230static int find_overflow_devnum(void)
1231{
1232 int ret;
1233
1234 if (!overflow_maj) {
1235 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UCM_MAX_DEVICES,
1236 "infiniband_cm");
1237 if (ret) {
1238 printk(KERN_ERR "ucm: couldn't register dynamic device number\n");
1239 return ret;
1240 }
1241 }
1242
1243 ret = find_first_zero_bit(overflow_map, IB_UCM_MAX_DEVICES);
1244 if (ret >= IB_UCM_MAX_DEVICES)
1245 return -1;
1246
1247 return ret;
1248}
1249
1250static void ib_ucm_add_one(struct ib_device *device)
1251{
1252 int devnum;
1253 dev_t base;
1254 struct ib_ucm_device *ucm_dev;
1255
1256 if (!device->alloc_ucontext ||
1257 rdma_node_get_transport(device->node_type) != RDMA_TRANSPORT_IB)
1258 return;
1259
1260 ucm_dev = kzalloc(sizeof *ucm_dev, GFP_KERNEL);
1261 if (!ucm_dev)
1262 return;
1263
1264 ucm_dev->ib_dev = device;
1265
1266 devnum = find_first_zero_bit(dev_map, IB_UCM_MAX_DEVICES);
1267 if (devnum >= IB_UCM_MAX_DEVICES) {
1268 devnum = find_overflow_devnum();
1269 if (devnum < 0)
1270 goto err;
1271
1272 ucm_dev->devnum = devnum + IB_UCM_MAX_DEVICES;
1273 base = devnum + overflow_maj;
1274 set_bit(devnum, overflow_map);
1275 } else {
1276 ucm_dev->devnum = devnum;
1277 base = devnum + IB_UCM_BASE_DEV;
1278 set_bit(devnum, dev_map);
1279 }
1280
1281 cdev_init(&ucm_dev->cdev, &ucm_fops);
1282 ucm_dev->cdev.owner = THIS_MODULE;
1283 kobject_set_name(&ucm_dev->cdev.kobj, "ucm%d", ucm_dev->devnum);
1284 if (cdev_add(&ucm_dev->cdev, base, 1))
1285 goto err;
1286
1287 ucm_dev->dev.class = &cm_class;
1288 ucm_dev->dev.parent = device->dma_device;
1289 ucm_dev->dev.devt = ucm_dev->cdev.dev;
1290 ucm_dev->dev.release = ib_ucm_release_dev;
1291 dev_set_name(&ucm_dev->dev, "ucm%d", ucm_dev->devnum);
1292 if (device_register(&ucm_dev->dev))
1293 goto err_cdev;
1294
1295 if (device_create_file(&ucm_dev->dev, &dev_attr_ibdev))
1296 goto err_dev;
1297
1298 ib_set_client_data(device, &ucm_client, ucm_dev);
1299 return;
1300
1301err_dev:
1302 device_unregister(&ucm_dev->dev);
1303err_cdev:
1304 cdev_del(&ucm_dev->cdev);
1305 if (ucm_dev->devnum < IB_UCM_MAX_DEVICES)
1306 clear_bit(devnum, dev_map);
1307 else
1308 clear_bit(devnum, overflow_map);
1309err:
1310 kfree(ucm_dev);
1311 return;
1312}
1313
1314static void ib_ucm_remove_one(struct ib_device *device)
1315{
1316 struct ib_ucm_device *ucm_dev = ib_get_client_data(device, &ucm_client);
1317
1318 if (!ucm_dev)
1319 return;
1320
1321 device_unregister(&ucm_dev->dev);
1322}
1323
1324static CLASS_ATTR_STRING(abi_version, S_IRUGO,
1325 __stringify(IB_USER_CM_ABI_VERSION));
1326
1327static int __init ib_ucm_init(void)
1328{
1329 int ret;
1330
1331 ret = register_chrdev_region(IB_UCM_BASE_DEV, IB_UCM_MAX_DEVICES,
1332 "infiniband_cm");
1333 if (ret) {
1334 printk(KERN_ERR "ucm: couldn't register device number\n");
1335 goto error1;
1336 }
1337
1338 ret = class_create_file(&cm_class, &class_attr_abi_version.attr);
1339 if (ret) {
1340 printk(KERN_ERR "ucm: couldn't create abi_version attribute\n");
1341 goto error2;
1342 }
1343
1344 ret = ib_register_client(&ucm_client);
1345 if (ret) {
1346 printk(KERN_ERR "ucm: couldn't register client\n");
1347 goto error3;
1348 }
1349 return 0;
1350
1351error3:
1352 class_remove_file(&cm_class, &class_attr_abi_version.attr);
1353error2:
1354 unregister_chrdev_region(IB_UCM_BASE_DEV, IB_UCM_MAX_DEVICES);
1355error1:
1356 return ret;
1357}
1358
1359static void __exit ib_ucm_cleanup(void)
1360{
1361 ib_unregister_client(&ucm_client);
1362 class_remove_file(&cm_class, &class_attr_abi_version.attr);
1363 unregister_chrdev_region(IB_UCM_BASE_DEV, IB_UCM_MAX_DEVICES);
1364 if (overflow_maj)
1365 unregister_chrdev_region(overflow_maj, IB_UCM_MAX_DEVICES);
1366 idr_destroy(&ctx_id_table);
1367}
1368
1369module_init(ib_ucm_init);
1370module_exit(ib_ucm_cleanup);
1371
