aboutsummaryrefslogtreecommitdiffstats
path: root/src/vpp-api/vapi/vapi.c
blob: 25c0b3be1d34c28d64108cb1372877955f663baf (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
/*
 *------------------------------------------------------------------
 * Copyright (c) 2017 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *------------------------------------------------------------------
 */

#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <arpa/inet.h>
#include <stddef.h>
#include <assert.h>

#include <vpp-api/vapi/vapi_dbg.h>
#include <vpp-api/vapi/vapi.h>
#include <vpp-api/vapi/vapi_internal.h>
#include <vppinfra/types.h>
#include <vppinfra/pool.h>
#include <vlib/vlib.h>
#include <vlibapi/api_common.h>
#include <vlibmemory/api_common.h>

/* we need to use control pings for some stuff and because we're forced to put
 * the code in headers, we need a way to be able to grab the ids of these
 * messages - so declare them here as extern */
vapi_msg_id_t vapi_msg_id_control_ping = 0;
vapi_msg_id_t vapi_msg_id_control_ping_reply = 0;

struct
{
  size_t count;
  vapi_message_desc_t **msgs;
  size_t max_len_name_with_crc;
} __vapi_metadata;

typedef struct
{
  u32 context;
  vapi_cb_t callback;
  void *callback_ctx;
  bool is_dump;
} vapi_req_t;

static const u32 context_counter_mask = (1 << 31);

typedef struct
{
  vapi_error_e (*cb) (vapi_ctx_t ctx, void *callback_ctx, vapi_msg_id_t id,
		      void *payload);
  void *ctx;
} vapi_generic_cb_with_ctx;

typedef struct
{
  vapi_error_e (*cb) (vapi_ctx_t ctx, void *callback_ctx, void *payload);
  void *ctx;
} vapi_event_cb_with_ctx;

struct vapi_ctx_s
{
  vapi_mode_e mode;
  int requests_size;		/* size of the requests array (circular queue) */
  int requests_start;		/* index of first request */
  int requests_count;		/* number of used slots */
  vapi_req_t *requests;
  u32 context_counter;
  vapi_generic_cb_with_ctx generic_cb;
  vapi_event_cb_with_ctx *event_cbs;
  u16 *vapi_msg_id_t_to_vl_msg_id;
  u16 vl_msg_id_max;
  vapi_msg_id_t *vl_msg_id_to_vapi_msg_t;
  bool connected;
  pthread_mutex_t requests_mutex;
};

u32
vapi_gen_req_context (vapi_ctx_t ctx)
{
  ++ctx->context_counter;
  ctx->context_counter %= context_counter_mask;
  return ctx->context_counter | context_counter_mask;
}

size_t
vapi_get_request_count (vapi_ctx_t ctx)
{
  return ctx->requests_count;
}

bool
vapi_requests_full (vapi_ctx_t ctx)
{
  return (ctx->requests_count == ctx->requests_size);
}

bool
vapi_requests_empty (vapi_ctx_t ctx)
{
  return (0 == ctx->requests_count);
}

static int
vapi_requests_end (vapi_ctx_t ctx)
{
  return (ctx->requests_start + ctx->requests_count) % ctx->requests_size;
}

void
vapi_store_request (vapi_ctx_t ctx, u32 context, bool is_dump,
		    vapi_cb_t callback, void *callback_ctx)
{
  assert (!vapi_requests_full (ctx));
  /* if the mutex is not held, bad things will happen */
  assert (0 != pthread_mutex_trylock (&ctx->requests_mutex));
  const int requests_end = vapi_requests_end (ctx);
  vapi_req_t *slot = &ctx->requests[requests_end];
  slot->is_dump = is_dump;
  slot->context = context;
  slot->callback = callback;
  slot->callback_ctx = callback_ctx;
  VAPI_DBG ("stored@%d: context:%x (start is @%d)", requests_end, context,
	    ctx->requests_start);
  ++ctx->requests_count;
  assert (!vapi_requests_empty (ctx));
}

#if VAPI_DEBUG_ALLOC
struct to_be_freed_s;
struct to_be_freed_s
{
  void *v;
  struct to_be_freed_s *next;
};

static struct to_be_freed_s *to_be_freed = NULL;

void
vapi_add_to_be_freed (void *v)
{
  struct to_be_freed_s *prev = NULL;
  struct to_be_freed_s *tmp;
  tmp = to_be_freed;
  while (tmp && tmp->v)
    {
      prev = tmp;
      tmp = tmp->next;
    }
  if (!tmp)
    {
      if (!prev)
	{
	  tmp = to_be_freed = calloc (1, sizeof (*to_be_freed));
	}
      else
	{
	  tmp = prev->next = calloc (1, sizeof (*to_be_freed));
	}
    }
  VAPI_DBG ("To be freed %p", v);
  tmp->v = v;
}

void
vapi_trace_free (void *v)
{
  struct to_be_freed_s *tmp = to_be_freed;
  while (tmp && tmp->v != v)
    {
      tmp = tmp->next;
    }
  if (tmp && tmp->v == v)
    {
      VAPI_DBG ("Freed %p", v);
      tmp->v = NULL;
    }
  else
    {
      VAPI_ERR ("Trying to free untracked pointer %p", v);
      abort ();
    }
}

void
vapi_to_be_freed_validate ()
{
  struct to_be_freed_s *tmp = to_be_freed;
  while (tmp)
    {
      if (tmp->v)
	{
	  VAPI_ERR ("Unfreed msg %p!", tmp->v);
	}
      tmp = tmp->next;
    }
}

#endif

void *
vapi_msg_alloc (vapi_ctx_t ctx, size_t size)
{
  if (!ctx->connected)
    {
      return NULL;
    }
  void *rv = vl_msg_api_alloc_or_null (size);
  return rv;
}

void
vapi_msg_free (vapi_ctx_t ctx, void *msg)
{
  if (!ctx->connected)
    {
      return;
    }
#if VAPI_DEBUG_ALLOC
  vapi_trace_free (msg);
#endif
  vl_msg_api_free (msg);
}

vapi_msg_id_t
vapi_lookup_vapi_msg_id_t (vapi_ctx_t ctx, u16 vl_msg_id)
{
  if (vl_msg_id <= ctx->vl_msg_id_max)
    {
      return ctx->vl_msg_id_to_vapi_msg_t[vl_msg_id];
    }
  return ~0;
}

vapi_error_e
vapi_ctx_alloc (vapi_ctx_t * result)
{
  vapi_ctx_t ctx = calloc (1, sizeof (struct vapi_ctx_s));
  if (!ctx)
    {
      return VAPI_ENOMEM;
    }
  ctx->context_counter = 0;
  ctx->vapi_msg_id_t_to_vl_msg_id =
    malloc (__vapi_metadata.count *
	    sizeof (*ctx->vapi_msg_id_t_to_vl_msg_id));
  if (!ctx->vapi_msg_id_t_to_vl_msg_id)
    {
      goto fail;
    }
  ctx->event_cbs = calloc (__vapi_metadata.count, sizeof (*ctx->event_cbs));
  if (!ctx->event_cbs)
    {
      goto fail;
    }
  pthread_mutex_init (&ctx->requests_mutex, NULL);
  *result = ctx;
  return VAPI_OK;
fail:
  vapi_ctx_free (ctx);
  return VAPI_ENOMEM;
}

void
vapi_ctx_free (vapi_ctx_t ctx)
{
  assert (!ctx->connected);
  free (ctx->requests);
  free (ctx->vapi_msg_id_t_to_vl_msg_id);
  free (ctx->event_cbs);
  free (ctx->vl_msg_id_to_vapi_msg_t);
  pthread_mutex_destroy (&ctx->requests_mutex);
  free (ctx);
}

bool
vapi_is_msg_available (vapi_ctx_t ctx, vapi_msg_id_t id)
{
  return vapi_lookup_vl_msg_id (ctx, id) != UINT16_MAX;
}

vapi_error_e
vapi_connect (vapi_ctx_t ctx, const char *name,
	      const char *chroot_prefix,
	      int max_outstanding_requests,
	      int response_queue_size, vapi_mode_e mode)
{
  if (response_queue_size <= 0 || max_outstanding_requests <= 0)
    {
      return VAPI_EINVAL;
    }
  ctx->requests_size = max_outstanding_requests;
  const size_t size = ctx->requests_size * sizeof (*ctx->requests);
  void *tmp = realloc (ctx->requests, size);
  if (!tmp)
    {
      return VAPI_ENOMEM;
    }
  ctx->requests = tmp;
  memset (ctx->requests, 0, size);
  /* coverity[MISSING_LOCK] - 177211 requests_mutex is not needed here */
  ctx->requests_start = ctx->requests_count = 0;
  if (chroot_prefix)
    {
      VAPI_DBG ("set memory root path `%s'", chroot_prefix);
      vl_set_memory_root_path ((char *) chroot_prefix);
    }
  static char api_map[] = "/vpe-api";
  VAPI_DBG ("client api map `%s'", api_map);
  if ((vl_client_api_map (api_map)) < 0)
    {
      return VAPI_EMAP_FAIL;
    }
  VAPI_DBG ("connect client `%s'", name);
  if (vl_client_connect ((char *) name, 0, response_queue_size) < 0)
    {
      vl_client_api_unmap ();
      return VAPI_ECON_FAIL;
    }
#if VAPI_DEBUG_CONNECT
  VAPI_DBG ("start probing messages");
#endif
  int rv;
  int i;
  for (i = 0; i < __vapi_metadata.count; ++i)
    {
      vapi_message_desc_t *m = __vapi_metadata.msgs[i];
      u8 scratch[m->name_with_crc_len + 1];
      memcpy (scratch, m->name_with_crc, m->name_with_crc_len + 1);
      u32 id = vl_api_get_msg_index (scratch);
      if (~0 != id)
	{
	  if (id > UINT16_MAX)
	    {
	      VAPI_ERR ("Returned vl_msg_id `%u' > UINT16MAX `%u'!", id,
			UINT16_MAX);
	      rv = VAPI_EINVAL;
	      goto fail;
	    }
	  if (id > ctx->vl_msg_id_max)
	    {
	      vapi_msg_id_t *tmp = realloc (ctx->vl_msg_id_to_vapi_msg_t,
					    sizeof
					    (*ctx->vl_msg_id_to_vapi_msg_t) *
					    (id + 1));
	      if (!tmp)
		{
		  rv = VAPI_ENOMEM;
		  goto fail;
		}
	      ctx->vl_msg_id_to_vapi_msg_t = tmp;
	      ctx->vl_msg_id_max = id;
	    }
	  ctx->vl_msg_id_to_vapi_msg_t[id] = m->id;
	  ctx->vapi_msg_id_t_to_vl_msg_id[m->id] = id;
#if VAPI_DEBUG_CONNECT
	  VAPI_DBG ("Message `%s' has vl_msg_id `%u'", m->name_with_crc,
		    (unsigned) id);
#endif
	}
      else
	{
	  ctx->vapi_msg_id_t_to_vl_msg_id[m->id] = UINT16_MAX;
	  VAPI_DBG ("Message `%s' not available", m->name_with_crc);
	}
    }
#if VAPI_DEBUG_CONNECT
  VAPI_DBG ("finished probing messages");
#endif
  if (!vapi_is_msg_available (ctx, vapi_msg_id_control_ping) ||
      !vapi_is_msg_available (ctx, vapi_msg_id_control_ping_reply))
    {
      VAPI_ERR
	("control ping or control ping reply not available, cannot connect");
      rv = VAPI_EINCOMPATIBLE;
      goto fail;
    }
  ctx->mode = mode;
  ctx->connected = true;
  return VAPI_OK;
fail:
  vl_client_disconnect ();
  vl_client_api_unmap ();
  return rv;
}

vapi_error_e
vapi_disconnect (vapi_ctx_t ctx)
{
  if (!ctx->connected)
    {
      return VAPI_EINVAL;
    }
  vl_client_disconnect ();
  vl_client_api_unmap ();
#if VAPI_DEBUG_ALLOC
  vapi_to_be_freed_validate ();
#endif
  ctx->connected = false;
  return VAPI_OK;
}

vapi_error_e
vapi_get_fd (vapi_ctx_t ctx, int *fd)
{
  return VAPI_ENOTSUP;
}

vapi_error_e
vapi_send (vapi_ctx_t ctx, void *msg)
{
  vapi_error_e rv = VAPI_OK;
  if (!ctx || !msg || !ctx->connected)
    {
      rv = VAPI_EINVAL;
      goto out;
    }
  int tmp;
  unix_shared_memory_queue_t *q = api_main.shmem_hdr->vl_input_queue;
#if VAPI_DEBUG
  unsigned msgid = be16toh (*(u16 *) msg);
  if (msgid <= ctx->vl_msg_id_max)
    {
      vapi_msg_id_t id = ctx->vl_msg_id_to_vapi_msg_t[msgid];
      if (id < __vapi_metadata.count)
	{
	  VAPI_DBG ("send msg@%p:%u[%s]", msg, msgid,
		    __vapi_metadata.msgs[id]->name);
	}
      else
	{
	  VAPI_DBG ("send msg@%p:%u[UNKNOWN]", msg, msgid);
	}
    }
  else
    {
      VAPI_DBG ("send msg@%p:%u[UNKNOWN]", msg, msgid);
    }
#endif
  tmp = unix_shared_memory_queue_add (q, (u8 *) & msg,
				      VAPI_MODE_BLOCKING ==
				      ctx->mode ? 0 : 1);
  if (tmp < 0)
    {
      rv = VAPI_EAGAIN;
    }
out:
  VAPI_DBG ("vapi_send() rv = %d", rv);
  return rv;
}

vapi_error_e
vapi_send2 (vapi_ctx_t ctx, void *msg1, void *msg2)
{
  vapi_error_e rv = VAPI_OK;
  if (!ctx || !msg1 || !msg2 || !ctx->connected)
    {
      rv = VAPI_EINVAL;
      goto out;
    }
  unix_shared_memory_queue_t *q = api_main.shmem_hdr->vl_input_queue;
#if VAPI_DEBUG
  unsigned msgid1 = be16toh (*(u16 *) msg1);
  unsigned msgid2 = be16toh (*(u16 *) msg2);
  const char *name1 = "UNKNOWN";
  const char *name2 = "UNKNOWN";
  if (msgid1 <= ctx->vl_msg_id_max)
    {
      vapi_msg_id_t id = ctx->vl_msg_id_to_vapi_msg_t[msgid1];
      if (id < __vapi_metadata.count)
	{
	  name1 = __vapi_metadata.msgs[id]->name;
	}
    }
  if (msgid2 <= ctx->vl_msg_id_max)
    {
      vapi_msg_id_t id = ctx->vl_msg_id_to_vapi_msg_t[msgid2];
      if (id < __vapi_metadata.count)
	{
	  name2 = __vapi_metadata.msgs[id]->name;
	}
    }
  VAPI_DBG ("send two: %u[%s], %u[%s]", msgid1, name1, msgid2, name2);
#endif
  int tmp = unix_shared_memory_queue_add2 (q, (u8 *) & msg1, (u8 *) & msg2,
					   VAPI_MODE_BLOCKING ==
					   ctx->mode ? 0 : 1);
  if (tmp < 0)
    {
      rv = VAPI_EAGAIN;
    }
out:
  VAPI_DBG ("vapi_send() rv = %d", rv);
  return rv;
}

vapi_error_e
vapi_recv (vapi_ctx_t ctx, void **msg, size_t * msg_size)
{
  if (!ctx || !ctx->connected || !msg || !msg_size)
    {
      return VAPI_EINVAL;
    }
  vapi_error_e rv = VAPI_OK;
  api_main_t *am = &api_main;
  uword data;

  if (am->our_pid == 0)
    {
      return VAPI_EINVAL;
    }

  unix_shared_memory_queue_t *q = am->vl_input_queue;
  VAPI_DBG ("doing shm queue sub");
  int tmp = unix_shared_memory_queue_sub (q, (u8 *) & data, 0);
  if (tmp == 0)
    {
#if VAPI_DEBUG_ALLOC
      vapi_add_to_be_freed ((void *) data);
#endif
      msgbuf_t *msgbuf =
	(msgbuf_t *) ((u8 *) data - offsetof (msgbuf_t, data));
      if (!msgbuf->data_len)
	{
	  vapi_msg_free (ctx, (u8 *) data);
	  return VAPI_EAGAIN;
	}
      *msg = (u8 *) data;
      *msg_size = ntohl (msgbuf->data_len);
#if VAPI_DEBUG
      unsigned msgid = be16toh (*(u16 *) * msg);
      if (msgid <= ctx->vl_msg_id_max)
	{
	  vapi_msg_id_t id = ctx->vl_msg_id_to_vapi_msg_t[msgid];
	  if (id < __vapi_metadata.count)
	    {
	      VAPI_DBG ("recv msg@%p:%u[%s]", *msg, msgid,
			__vapi_metadata.msgs[id]->name);
	    }
	  else
	    {
	      VAPI_DBG ("recv msg@%p:%u[UNKNOWN]", *msg, msgid);
	    }
	}
      else
	{
	  VAPI_DBG ("recv msg@%p:%u[UNKNOWN]", *msg, msgid);
	}
#endif
    }
  else
    {
      rv = VAPI_EAGAIN;
    }
  return rv;
}

vapi_error_e
vapi_wait (vapi_ctx_t ctx, vapi_wait_mode_e mode)
{
  return VAPI_ENOTSUP;
}

static vapi_error_e
vapi_dispatch_response (vapi_ctx_t ctx, vapi_msg_id_t id,
			u32 context, void *msg)
{
  int mrv;
  if (0 != (mrv = pthread_mutex_lock (&ctx->requests_mutex)))
    {
      VAPI_DBG ("pthread_mutex_lock() failed, rv=%d:%s", mrv, strerror (mrv));
      return VAPI_MUTEX_FAILURE;
    }
  int tmp = ctx->requests_start;
  const int requests_end = vapi_requests_end (ctx);
  while (ctx->requests[tmp].context != context && tmp != requests_end)
    {
      ++tmp;
      if (tmp == ctx->requests_size)
	{
	  tmp = 0;
	}
    }
  VAPI_DBG ("dispatch, search from %d, %s at %d", ctx->requests_start,
	    ctx->requests[tmp].context == context ? "matched" : "stopped",
	    tmp);
  vapi_error_e rv = VAPI_OK;
  if (ctx->requests[tmp].context == context)
    {
      while (ctx->requests_start != tmp)
	{
	  VAPI_ERR ("No response to req with context=%u",
		    (unsigned) ctx->requests[tmp].context);
	  ctx->requests[ctx->requests_start].callback (ctx,
						       ctx->requests
						       [ctx->
							requests_start].callback_ctx,
						       VAPI_ENORESP, true,
						       NULL);
	  memset (&ctx->requests[ctx->requests_start], 0,
		  sizeof (ctx->requests[ctx->requests_start]));
	  ++ctx->requests_start;
	  --ctx->requests_count;
	  if (ctx->requests_start == ctx->requests_size)
	    {
	      ctx->requests_start = 0;
	    }
	}
      // now ctx->requests_start == tmp
      int payload_offset = vapi_get_payload_offset (id);
      void *payload = ((u8 *) msg) + payload_offset;
      bool is_last = true;
      if (ctx->requests[tmp].is_dump)
	{
	  if (vapi_msg_id_control_ping_reply == id)
	    {
	      payload = NULL;
	    }
	  else
	    {
	      is_last = false;
	    }
	}
      if (payload_offset != -1)
	{
	  rv =
	    ctx->requests[tmp].callback (ctx, ctx->requests[tmp].callback_ctx,
					 VAPI_OK, is_last, payload);
	}
      else
	{
	  /* this is a message without payload, so bend the callback a little
	   */
	  rv =
	    ((vapi_error_e (*)(vapi_ctx_t, void *, vapi_error_e, bool))
	     ctx->requests[tmp].callback) (ctx,
					   ctx->requests[tmp].callback_ctx,
					   VAPI_OK, is_last);
	}
      if (is_last)
	{
	  memset (&ctx->requests[ctx->requests_start], 0,
		  sizeof (ctx->requests[ctx->requests_start]));
	  ++ctx->requests_start;
	  --ctx->requests_count;
	  if (ctx->requests_start == ctx->requests_size)
	    {
	      ctx->requests_start = 0;
	    }
	}
      VAPI_DBG ("after dispatch, req start = %d, end = %d, count = %d",
		ctx->requests_start, requests_end, ctx->requests_count);
    }
  if (0 != (mrv = pthread_mutex_unlock (&ctx->requests_mutex)))
    {
      VAPI_DBG ("pthread_mutex_unlock() failed, rv=%d:%s", mrv,
		strerror (mrv));
      abort ();			/* this really shouldn't happen */
    }
  return rv;
}

static vapi_error_e
vapi_dispatch_event (vapi_ctx_t ctx, vapi_msg_id_t id, void *msg)
{
  if (ctx->event_cbs[id].cb)
    {
      return ctx->event_cbs[id].cb (ctx, ctx->event_cbs[id].ctx, msg);
    }
  else if (ctx->generic_cb.cb)
    {
      return ctx->generic_cb.cb (ctx, ctx->generic_cb.ctx, id, msg);
    }
  else
    {
      VAPI_DBG
	("No handler/generic handler for msg id %u[%s], message ignored",
	 (unsigned) id, __vapi_metadata.msgs[id]->name);
    }
  return VAPI_OK;
}

bool
vapi_msg_is_with_context (vapi_msg_id_t id)
{
  assert (id <= __vapi_metadata.count);
  return __vapi_metadata.msgs[id]->has_context;
}

vapi_error_e
vapi_dispatch_one (vapi_ctx_t ctx)
{
  VAPI_DBG ("vapi_dispatch_one()");
  void *msg;
  size_t size;
  vapi_error_e rv = vapi_recv (ctx, &msg, &size);
  if (VAPI_OK != rv)
    {
      VAPI_DBG ("vapi_recv failed with rv=%d", rv);
      return rv;
    }
  u16 vpp_id = be16toh (*(u16 *) msg);
  if (vpp_id > ctx->vl_msg_id_max)
    {
      VAPI_ERR ("Unknown msg ID received, id `%u', out of range <0,%u>",
		(unsigned) vpp_id, (unsigned) ctx->vl_msg_id_max);
      vapi_msg_free (ctx, msg);
      return VAPI_EINVAL;
    }
  if (~0 == (unsigned) ctx->vl_msg_id_to_vapi_msg_t[vpp_id])
    {
      VAPI_ERR ("Unknown msg ID received, id `%u' marked as not supported",
		(unsigned) vpp_id);
      vapi_msg_free (ctx, msg);
      return VAPI_EINVAL;
    }
  const vapi_msg_id_t id = ctx->vl_msg_id_to_vapi_msg_t[vpp_id];
  const size_t expect_size = vapi_get_message_size (id);
  if (size < expect_size)
    {
      VAPI_ERR
	("Invalid msg received, unexpected size `%zu' < expected min `%zu'",
	 size, expect_size);
      vapi_msg_free (ctx, msg);
      return VAPI_EINVAL;
    }
  u32 context;
  vapi_get_swap_to_host_func (id) (msg);
  if (vapi_msg_is_with_context (id))
    {
      context = *(u32 *) (((u8 *) msg) + vapi_get_context_offset (id));
      /* is this a message originating from VAPI? */
      VAPI_DBG ("dispatch, context is %x", context);
      if (context & context_counter_mask)
	{
	  rv = vapi_dispatch_response (ctx, id, context, msg);
	  goto done;
	}
    }
  rv = vapi_dispatch_event (ctx, id, msg);

done:
  vapi_msg_free (ctx, msg);
  return rv;
}

vapi_error_e
vapi_dispatch (vapi_ctx_t ctx)
{
  vapi_error_e rv = VAPI_OK;
  while (!vapi_requests_empty (ctx))
    {
      rv = vapi_dispatch_one (ctx);
      if (VAPI_OK != rv)
	{
	  return rv;
	}
    }
  return rv;
}

void
vapi_set_event_cb (vapi_ctx_t ctx, vapi_msg_id_t id,
		   vapi_event_cb callback, void *callback_ctx)
{
  vapi_event_cb_with_ctx *c = &ctx->event_cbs[id];
  c->cb = callback;
  c->ctx = callback_ctx;
}

void
vapi_clear_event_cb (vapi_ctx_t ctx, vapi_msg_id_t id)
{
  vapi_set_event_cb (ctx, id, NULL, NULL);
}

void
vapi_set_generic_event_cb (vapi_ctx_t ctx, vapi_generic_event_cb callback,
			   void *callback_ctx)
{
  ctx->generic_cb.cb = callback;
  ctx->generic_cb.ctx = callback_ctx;
}

void
vapi_clear_generic_event_cb (vapi_ctx_t ctx)
{
  ctx->generic_cb.cb = NULL;
  ctx->generic_cb.ctx = NULL;
}

u16
vapi_lookup_vl_msg_id (vapi_ctx_t ctx, vapi_msg_id_t id)
{
  assert (id < __vapi_metadata.count);
  return ctx->vapi_msg_id_t_to_vl_msg_id[id];
}

int
vapi_get_client_index (vapi_ctx_t ctx)
{
  return api_main.my_client_index;
}

bool
vapi_is_nonblocking (vapi_ctx_t ctx)
{
  return (VAPI_MODE_NONBLOCKING == ctx->mode);
}

size_t
vapi_get_max_request_count (vapi_ctx_t ctx)
{
  return ctx->requests_size - 1;
}

int
vapi_get_payload_offset (vapi_msg_id_t id)
{
  assert (id < __vapi_metadata.count);
  return __vapi_metadata.msgs[id]->payload_offset;
}

void (*vapi_get_swap_to_host_func (vapi_msg_id_t id)) (void *msg)
{
  assert (id < __vapi_metadata.count);
  return __vapi_metadata.msgs[id]->swap_to_host;
}

void (*vapi_get_swap_to_be_func (vapi_msg_id_t id)) (void *msg)
{
  assert (id < __vapi_metadata.count);
  return __vapi_metadata.msgs[id]->swap_to_be;
}

size_t
vapi_get_message_size (vapi_msg_id_t id)
{
  assert (id < __vapi_metadata.count);
  return __vapi_metadata.msgs[id]->size;
}

size_t
vapi_get_context_offset (vapi_msg_id_t id)
{
  assert (id < __vapi_metadata.count);
  return __vapi_metadata.msgs[id]->context_offset;
}

vapi_msg_id_t
vapi_register_msg (vapi_message_desc_t * msg)
{
  int i = 0;
  for (i = 0; i < __vapi_metadata.count; ++i)
    {
      if (!strcmp
	  (msg->name_with_crc, __vapi_metadata.msgs[i]->name_with_crc))
	{
	  /* this happens if somebody is linking together several objects while
	   * using the static inline headers, just fill in the already
	   * assigned id here so that all the objects are in sync */
	  msg->id = __vapi_metadata.msgs[i]->id;
	  return msg->id;
	}
    }
  vapi_msg_id_t id = __vapi_metadata.count;
  ++__vapi_metadata.count;
  __vapi_metadata.msgs =
    realloc (__vapi_metadata.msgs,
	     sizeof (*__vapi_metadata.msgs) * __vapi_metadata.count);
  __vapi_metadata.msgs[id] = msg;
  size_t s = strlen (msg->name_with_crc);
  if (s > __vapi_metadata.max_len_name_with_crc)
    {
      __vapi_metadata.max_len_name_with_crc = s;
    }
  msg->id = id;
  return id;
}

vapi_error_e
vapi_producer_lock (vapi_ctx_t ctx)
{
  int mrv;
  if (0 != (mrv = pthread_mutex_lock (&ctx->requests_mutex)))
    {
      VAPI_DBG ("pthread_mutex_lock() failed, rv=%d:%s", mrv, strerror (mrv));
      (void) mrv;		/* avoid warning if the above debug is not enabled */
      return VAPI_MUTEX_FAILURE;
    }
  return VAPI_OK;
}

vapi_error_e
vapi_producer_unlock (vapi_ctx_t ctx)
{
  int mrv;
  if (0 != (mrv = pthread_mutex_unlock (&ctx->requests_mutex)))
    {
      VAPI_DBG ("pthread_mutex_unlock() failed, rv=%d:%s", mrv,
		strerror (mrv));
      (void) mrv;		/* avoid warning if the above debug is not enabled */
      return VAPI_MUTEX_FAILURE;
    }
  return VAPI_OK;
}

size_t
vapi_get_message_count ()
{
  return __vapi_metadata.count;
}

const char *
vapi_get_msg_name (vapi_msg_id_t id)
{
  return __vapi_metadata.msgs[id]->name;
}

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */