summaryrefslogtreecommitdiffstats
path: root/src/vlibmemory/memclnt_api.c
blob: 9e2971a9d04d1758667fb7d8bc5f3f483d3d6793 (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
/*
 *------------------------------------------------------------------
 * memclnt_api.c VLIB API implementation
 *
 * Copyright (c) 2009 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 <fcntl.h>
#include <pthread.h>
#include <vppinfra/vec.h>
#include <vppinfra/hash.h>
#include <vppinfra/pool.h>
#include <vppinfra/format.h>
#include <vppinfra/byte_order.h>
#include <vppinfra/elog.h>
#include <vlib/vlib.h>
#include <vlib/unix/unix.h>
#include <vlibapi/api.h>
#include <vlibmemory/api.h>
#include <vlibapi/api_helper_macros.h>

/**
 * @file
 * @brief Binary API messaging via shared memory
 * Low-level, primary provisioning interface
 */
/*? %%clicmd:group_label Binary API CLI %% ?*/
/*? %%syscfg:group_label Binary API configuration %% ?*/

#define TRACE_VLIB_MEMORY_QUEUE 0

#include <vlibmemory/vl_memory_msg_enum.h> /* enumerate all vlib messages */

#define vl_typedefs /* define message structures */
#include <vlibmemory/vl_memory_api_h.h>
#undef vl_typedefs

/* instantiate all the print functions we know about */
#define vl_print(handle, ...) vlib_cli_output (handle, __VA_ARGS__)
#define vl_printfun
#include <vlibmemory/vl_memory_api_h.h>
#undef vl_printfun

/* instantiate all the endian swap functions we know about */
#define vl_endianfun
#include <vlibmemory/vl_memory_api_h.h>
#undef vl_endianfun

#define vl_calcsizefun
#include <vlibmemory/vl_memory_api_h.h>
#undef vl_calcsizefun

static void
vl_api_get_first_msg_id_t_handler (vl_api_get_first_msg_id_t *mp)
{
  vl_api_get_first_msg_id_reply_t *rmp;
  vl_api_registration_t *regp;
  uword *p;
  api_main_t *am = vlibapi_get_main ();
  vl_api_msg_range_t *rp;
  u8 name[64];
  u16 first_msg_id = ~0;
  int rv = -7; /* VNET_API_ERROR_INVALID_VALUE */

  regp = vl_api_client_index_to_registration (mp->client_index);
  if (!regp)
    return;

  if (am->msg_range_by_name == 0)
    goto out;
  strncpy ((char *) name, (char *) mp->name, ARRAY_LEN (name));
  name[ARRAY_LEN (name) - 1] = '\0';
  p = hash_get_mem (am->msg_range_by_name, name);
  if (p == 0)
    goto out;

  rp = vec_elt_at_index (am->msg_ranges, p[0]);
  first_msg_id = rp->first_msg_id;
  rv = 0;

out:
  rmp = vl_msg_api_alloc (sizeof (*rmp));
  rmp->_vl_msg_id = ntohs (VL_API_GET_FIRST_MSG_ID_REPLY);
  rmp->context = mp->context;
  rmp->retval = ntohl (rv);
  rmp->first_msg_id = ntohs (first_msg_id);
  vl_api_send_msg (regp, (u8 *) rmp);
}

void
vl_api_api_versions_t_handler (vl_api_api_versions_t *mp)
{
  api_main_t *am = vlibapi_get_main ();
  vl_api_api_versions_reply_t *rmp;
  vl_api_registration_t *reg;
  u32 nmsg = vec_len (am->api_version_list);
  int msg_size = sizeof (*rmp) + sizeof (rmp->api_versions[0]) * nmsg;
  int i;

  reg = vl_api_client_index_to_registration (mp->client_index);
  if (!reg)
    return;

  rmp = vl_msg_api_alloc (msg_size);
  clib_memset (rmp, 0, msg_size);
  rmp->_vl_msg_id = ntohs (VL_API_API_VERSIONS_REPLY);

  /* fill in the message */
  rmp->context = mp->context;
  rmp->count = htonl (nmsg);

  for (i = 0; i < nmsg; ++i)
    {
      api_version_t *vl = &am->api_version_list[i];
      rmp->api_versions[i].major = htonl (vl->major);
      rmp->api_versions[i].minor = htonl (vl->minor);
      rmp->api_versions[i].patch = htonl (vl->patch);
      strncpy ((char *) rmp->api_versions[i].name, vl->name,
	       ARRAY_LEN (rmp->api_versions[i].name));
      rmp->api_versions[i].name[ARRAY_LEN (rmp->api_versions[i].name) - 1] =
	'\0';
    }

  vl_api_send_msg (reg, (u8 *) rmp);
}

static void
vl_api_control_ping_t_handler (vl_api_control_ping_t *mp)
{
  vl_api_control_ping_reply_t *rmp;
  int rv = 0;

  REPLY_MACRO2 (VL_API_CONTROL_PING_REPLY,
		({ rmp->vpe_pid = ntohl (getpid ()); }));
}

#define foreach_vlib_api_msg                                                  \
  _ (GET_FIRST_MSG_ID, get_first_msg_id)                                      \
  _ (API_VERSIONS, api_versions)                                              \
  _ (CONTROL_PING, control_ping)

/*
 * vl_api_init
 */
static int
vlib_api_init (void)
{
  api_main_t *am = vlibapi_get_main ();
  vl_msg_api_msg_config_t cfg;
  vl_msg_api_msg_config_t *c = &cfg;

  cJSON_Hooks cjson_hooks = {
    .malloc_fn = clib_mem_alloc,
    .free_fn = clib_mem_free,
  };
  cJSON_InitHooks (&cjson_hooks);

  clib_memset (c, 0, sizeof (*c));

#define _(N, n)                                                               \
  do                                                                          \
    {                                                                         \
      c->id = VL_API_##N;                                                     \
      c->name = #n;                                                           \
      c->handler = vl_api_##n##_t_handler;                                    \
      c->cleanup = vl_noop_handler;                                           \
      c->endian = vl_api_##n##_t_endian;                                      \
      c->print = vl_api_##n##_t_print;                                        \
      c->print_json = vl_api_##n##_t_print_json;                              \
      c->tojson = vl_api_##n##_t_tojson;                                      \
      c->fromjson = vl_api_##n##_t_fromjson;                                  \
      c->calc_size = vl_api_##n##_t_calc_size;                                \
      c->size = sizeof (vl_api_##n##_t);                                      \
      c->traced = 1;	     /* trace, so these msgs print */                 \
      c->replay = 0;	     /* don't replay client create/delete msgs */     \
      c->message_bounce = 0; /* don't bounce this message */                  \
      vl_msg_api_config (c);                                                  \
    }                                                                         \
  while (0);

  foreach_vlib_api_msg;
#undef _

  vl_api_set_msg_thread_safe (am, VL_API_CONTROL_PING, 1);
  vl_api_set_msg_thread_safe (am, VL_API_CONTROL_PING_REPLY, 1);

  return 0;
}

u64 vector_rate_histogram[SLEEP_N_BUCKETS];

/*
 * Callback to send ourselves a plugin numbering-space trace msg
 */
static void
send_one_plugin_msg_ids_msg (u8 *name, u16 first_msg_id, u16 last_msg_id)
{
  vl_api_trace_plugin_msg_ids_t *mp;
  api_main_t *am = vlibapi_get_main ();
  vl_shmem_hdr_t *shmem_hdr = am->shmem_hdr;
  svm_queue_t *q;

  mp = vl_msg_api_alloc_as_if_client (sizeof (*mp));
  clib_memset (mp, 0, sizeof (*mp));

  mp->_vl_msg_id = clib_host_to_net_u16 (VL_API_TRACE_PLUGIN_MSG_IDS);
  strncpy ((char *) mp->plugin_name, (char *) name,
	   sizeof (mp->plugin_name) - 1);
  mp->first_msg_id = clib_host_to_net_u16 (first_msg_id);
  mp->last_msg_id = clib_host_to_net_u16 (last_msg_id);

  q = shmem_hdr->vl_input_queue;

  vl_msg_api_send_shmem (q, (u8 *) &mp);
}

void
vl_api_save_msg_table (void)
{
  u8 *serialized_message_table;
  api_main_t *am = vlibapi_get_main ();
  u8 *chroot_file;
  int fd, rv;

  /*
   * Snapshoot the api message table.
   */
  if (strstr ((char *) am->save_msg_table_filename, "..") ||
      index ((char *) am->save_msg_table_filename, '/'))
    {
      clib_warning ("illegal save-message-table filename '%s'",
		    am->save_msg_table_filename);
      return;
    }

  chroot_file = format (0, "/tmp/%s%c", am->save_msg_table_filename, 0);

  fd = creat ((char *) chroot_file, 0644);

  if (fd < 0)
    {
      clib_unix_warning ("creat");
      return;
    }

  serialized_message_table = vl_api_serialize_message_table (am, 0);

  rv =
    write (fd, serialized_message_table, vec_len (serialized_message_table));

  if (rv != vec_len (serialized_message_table))
    clib_unix_warning ("write");

  rv = close (fd);
  if (rv < 0)
    clib_unix_warning ("close");

  vec_free (chroot_file);
  vec_free (serialized_message_table);
}

clib_error_t *vat_builtin_main_init (vlib_main_t *vm) __attribute__ ((weak));
clib_error_t *
vat_builtin_main_init (vlib_main_t *vm)
{
  return 0;
}

static uword
vl_api_clnt_process (vlib_main_t *vm, vlib_node_runtime_t *node,
		     vlib_frame_t *f)
{
  vlib_global_main_t *vgm = vlib_get_global_main ();
  int private_segment_rotor = 0, i, rv;
  vl_socket_args_for_process_t *a;
  vl_shmem_hdr_t *shm;
  svm_queue_t *q;
  clib_error_t *e;
  api_main_t *am = vlibapi_get_main ();
  f64 dead_client_scan_time;
  f64 sleep_time, start_time;
  f64 vector_rate;
  clib_error_t *error;
  uword event_type;
  uword *event_data = 0;
  f64 now;

  if ((error = vl_sock_api_init (vm)))
    {
      clib_error_report (error);
      clib_warning ("socksvr_api_init failed, quitting...");
      return 0;
    }

  if ((rv = vlib_api_init ()) < 0)
    {
      clib_warning ("vlib_api_init returned %d, quitting...", rv);
      return 0;
    }

  shm = am->shmem_hdr;
  q = shm->vl_input_queue;

  e = vlib_call_init_exit_functions (vm, &vgm->api_init_function_registrations,
				     1 /* call_once */, 1 /* is_global */);
  if (e)
    clib_error_report (e);

  e = vat_builtin_main_init (vm);
  if (e)
    clib_error_report (e);

  sleep_time = 10.0;
  dead_client_scan_time = vlib_time_now (vm) + 10.0;

  /*
   * Send plugin message range messages for each plugin we loaded
   */
  for (i = 0; i < vec_len (am->msg_ranges); i++)
    {
      vl_api_msg_range_t *rp = am->msg_ranges + i;
      send_one_plugin_msg_ids_msg (rp->name, rp->first_msg_id,
				   rp->last_msg_id);
    }

  /*
   * Save the api message table snapshot, if configured
   */
  if (am->save_msg_table_filename)
    vl_api_save_msg_table ();

  /* $$$ pay attention to frame size, control CPU usage */
  while (1)
    {
      /*
       * There's a reason for checking the queue before
       * sleeping. If the vlib application crashes, it's entirely
       * possible for a client to enqueue a connect request
       * during the process restart interval.
       *
       * Unless some force of physics causes the new incarnation
       * of the application to process the request, the client will
       * sit and wait for Godot...
       */
      vector_rate = (f64) vlib_last_vectors_per_main_loop (vm);
      start_time = vlib_time_now (vm);
      while (1)
	{
	  if (vl_mem_api_handle_rpc (vm, node) ||
	      vl_mem_api_handle_msg_main (vm, node))
	    {
	      vm->api_queue_nonempty = 0;
	      VL_MEM_API_LOG_Q_LEN ("q-underflow: len %d", 0);
	      sleep_time = 20.0;
	      break;
	    }

	  /* Allow no more than 10us without a pause */
	  if (vlib_time_now (vm) > start_time + 10e-6)
	    {
	      int index = SLEEP_400_US;
	      if (vector_rate > 40.0)
		sleep_time = 400e-6;
	      else if (vector_rate > 20.0)
		{
		  index = SLEEP_200_US;
		  sleep_time = 200e-6;
		}
	      else if (vector_rate >= 1.0)
		{
		  index = SLEEP_100_US;
		  sleep_time = 100e-6;
		}
	      else
		{
		  index = SLEEP_10_US;
		  sleep_time = 10e-6;
		}
	      vector_rate_histogram[index] += 1;
	      break;
	    }
	}

      /*
       * see if we have any private api shared-memory segments
       * If so, push required context variables, and process
       * a message.
       */
      if (PREDICT_FALSE (vec_len (am->vlib_private_rps)))
	{
	  if (private_segment_rotor >= vec_len (am->vlib_private_rps))
	    private_segment_rotor = 0;
	  vl_mem_api_handle_msg_private (vm, node, private_segment_rotor++);
	}

      vlib_process_wait_for_event_or_clock (vm, sleep_time);
      vec_reset_length (event_data);
      event_type = vlib_process_get_events (vm, &event_data);
      now = vlib_time_now (vm);

      switch (event_type)
	{
	case QUEUE_SIGNAL_EVENT:
	  vm->queue_signal_pending = 0;
	  VL_MEM_API_LOG_Q_LEN ("q-awake: len %d", q->cursize);

	  break;
	case SOCKET_READ_EVENT:
	  for (i = 0; i < vec_len (event_data); i++)
	    {
	      vl_api_registration_t *regp;

	      a = pool_elt_at_index (socket_main.process_args, event_data[i]);
	      regp = vl_socket_get_registration (a->reg_index);
	      if (regp)
		{
		  vl_socket_process_api_msg (regp, (i8 *) a->data);
		  a = pool_elt_at_index (socket_main.process_args,
					 event_data[i]);
		}
	      vec_free (a->data);
	      pool_put (socket_main.process_args, a);
	    }
	  break;

	  /* Timeout... */
	case -1:
	  break;

	default:
	  clib_warning ("unknown event type %d", event_type);
	  break;
	}

      if (now > dead_client_scan_time)
	{
	  vl_mem_api_dead_client_scan (am, shm, now);
	  dead_client_scan_time = vlib_time_now (vm) + 10.0;
	}
    }

  return 0;
}

VLIB_REGISTER_NODE (vl_api_clnt_node) = {
  .function = vl_api_clnt_process,
  .type = VLIB_NODE_TYPE_PROCESS,
  .name = "api-rx-from-ring",
  .state = VLIB_NODE_STATE_DISABLED,
  .process_log2_n_stack_bytes = 18,
};

void
vl_mem_api_enable_disable (vlib_main_t *vm, int enable)
{
  vlib_node_set_state (
    vm, vl_api_clnt_node.index,
    (enable ? VLIB_NODE_STATE_POLLING : VLIB_NODE_STATE_DISABLED));
}

static uword
api_rx_from_node (vlib_main_t *vm, vlib_node_runtime_t *node,
		  vlib_frame_t *frame)
{
  uword n_packets = frame->n_vectors;
  uword n_left_from;
  u32 *from;
  static u8 *long_msg;

  vec_validate (long_msg, 4095);
  n_left_from = frame->n_vectors;
  from = vlib_frame_vector_args (frame);

  while (n_left_from > 0)
    {
      u32 bi0;
      vlib_buffer_t *b0;
      void *msg;
      uword msg_len;

      bi0 = from[0];
      b0 = vlib_get_buffer (vm, bi0);
      from += 1;
      n_left_from -= 1;

      msg = b0->data + b0->current_data;
      msg_len = b0->current_length;
      if (b0->flags & VLIB_BUFFER_NEXT_PRESENT)
	{
	  ASSERT (long_msg != 0);
	  vec_set_len (long_msg, 0);
	  vec_add (long_msg, msg, msg_len);
	  while (b0->flags & VLIB_BUFFER_NEXT_PRESENT)
	    {
	      b0 = vlib_get_buffer (vm, b0->next_buffer);
	      msg = b0->data + b0->current_data;
	      msg_len = b0->current_length;
	      vec_add (long_msg, msg, msg_len);
	    }
	  msg = long_msg;
	  msg_len = vec_len (long_msg);
	}
      vl_msg_api_handler_no_trace_no_free (msg, msg_len);
    }

  /* Free what we've been given. */
  vlib_buffer_free (vm, vlib_frame_vector_args (frame), n_packets);

  return n_packets;
}

VLIB_REGISTER_NODE (api_rx_from_node_node, static) = {
  .function = api_rx_from_node,
  .type = VLIB_NODE_TYPE_INTERNAL,
  .vector_size = 4,
  .name = "api-rx-from-node",
};

static void
vl_api_rpc_call_t_handler (vl_api_rpc_call_t *mp)
{
  vl_api_rpc_call_reply_t *rmp;
  int (*fp) (void *);
  i32 rv = 0;
  vlib_main_t *vm = vlib_get_main ();

  if (mp->function == 0)
    {
      rv = -1;
      clib_warning ("rpc NULL function pointer");
    }

  else
    {
      if (mp->need_barrier_sync)
	vlib_worker_thread_barrier_sync (vm);

      fp = uword_to_pointer (mp->function, int (*) (void *));
      rv = fp (mp->data);

      if (mp->need_barrier_sync)
	vlib_worker_thread_barrier_release (vm);
    }

  if (mp->send_reply)
    {
      svm_queue_t *q = vl_api_client_index_to_input_queue (mp->client_index);
      if (q)
	{
	  rmp = vl_msg_api_alloc_as_if_client (sizeof (*rmp));
	  rmp->_vl_msg_id = ntohs (VL_API_RPC_CALL_REPLY);
	  rmp->context = mp->context;
	  rmp->retval = rv;
	  vl_msg_api_send_shmem (q, (u8 *) &rmp);
	}
    }
  if (mp->multicast)
    {
      clib_warning ("multicast not yet implemented...");
    }
}

static void
vl_api_rpc_call_reply_t_handler (vl_api_rpc_call_reply_t *mp)
{
  clib_warning ("unimplemented");
}

void
vl_api_send_pending_rpc_requests (vlib_main_t *vm)
{
  vlib_main_t *vm_global = vlib_get_first_main ();

  ASSERT (vm != vm_global);

  clib_spinlock_lock_if_init (&vm_global->pending_rpc_lock);
  vec_append (vm_global->pending_rpc_requests, vm->pending_rpc_requests);
  vec_reset_length (vm->pending_rpc_requests);
  clib_spinlock_unlock_if_init (&vm_global->pending_rpc_lock);
}

always_inline void
vl_api_rpc_call_main_thread_inline (void *fp, u8 *data, u32 data_length,
				    u8 force_rpc)
{
  vl_api_rpc_call_t *mp;
  vlib_main_t *vm_global = vlib_get_first_main ();
  vlib_main_t *vm = vlib_get_main ();

  /* Main thread and not a forced RPC: call the function directly */
  if ((force_rpc == 0) && (vlib_get_thread_index () == 0))
    {
      void (*call_fp) (void *);

      vlib_worker_thread_barrier_sync (vm);

      call_fp = fp;
      call_fp (data);

      vlib_worker_thread_barrier_release (vm);
      return;
    }

  /* Otherwise, actually do an RPC */
  mp = vl_msg_api_alloc_as_if_client (sizeof (*mp) + data_length);

  clib_memset (mp, 0, sizeof (*mp));
  clib_memcpy_fast (mp->data, data, data_length);
  mp->_vl_msg_id = ntohs (VL_API_RPC_CALL);
  mp->function = pointer_to_uword (fp);
  mp->need_barrier_sync = 1;

  /* Add to the pending vector. Thread 0 requires locking. */
  if (vm == vm_global)
    clib_spinlock_lock_if_init (&vm_global->pending_rpc_lock);
  vec_add1 (vm->pending_rpc_requests, (uword) mp);
  if (vm == vm_global)
    clib_spinlock_unlock_if_init (&vm_global->pending_rpc_lock);
}

/*
 * Check if called from worker threads.
 * If so, make rpc call of fp through shmem.
 * Otherwise, call fp directly
 */
void
vl_api_rpc_call_main_thread (void *fp, u8 *data, u32 data_length)
{
  vl_api_rpc_call_main_thread_inline (fp, data, data_length, /*force_rpc */
				      0);
}

/*
 * Always make rpc call of fp through shmem, useful for calling from threads
 * not setup as worker threads, such as DPDK callback thread
 */
void
vl_api_force_rpc_call_main_thread (void *fp, u8 *data, u32 data_length)
{
  vl_api_rpc_call_main_thread_inline (fp, data, data_length, /*force_rpc */
				      1);
}

static void
vl_api_trace_plugin_msg_ids_t_handler (vl_api_trace_plugin_msg_ids_t *mp)
{
  api_main_t *am = vlibapi_get_main ();
  vl_api_msg_range_t *rp;
  uword *p;

  /* Noop (except for tracing) during normal operation */
  if (am->replay_in_progress == 0)
    return;

  p = hash_get_mem (am->msg_range_by_name, mp->plugin_name);
  if (p == 0)
    {
      clib_warning ("WARNING: traced plugin '%s' not in current image",
		    mp->plugin_name);
      return;
    }

  rp = vec_elt_at_index (am->msg_ranges, p[0]);
  if (rp->first_msg_id != clib_net_to_host_u16 (mp->first_msg_id))
    {
      clib_warning ("WARNING: traced plugin '%s' first message id %d not %d",
		    mp->plugin_name, clib_net_to_host_u16 (mp->first_msg_id),
		    rp->first_msg_id);
    }

  if (rp->last_msg_id != clib_net_to_host_u16 (mp->last_msg_id))
    {
      clib_warning ("WARNING: traced plugin '%s' last message id %d not %d",
		    mp->plugin_name, clib_net_to_host_u16 (mp->last_msg_id),
		    rp->last_msg_id);
    }
}

#define foreach_rpc_api_msg                                                   \
  _ (RPC_CALL, rpc_call)                                                      \
  _ (RPC_CALL_REPLY, rpc_call_reply)

#define foreach_plugin_trace_msg _ (TRACE_PLUGIN_MSG_IDS, trace_plugin_msg_ids)

/*
 * Set the rpc callback at our earliest possible convenience.
 * This avoids ordering issues between thread_init() -> start_workers and
 * an init function which we could define here. If we ever intend to use
 * vlib all by itself, we can't create a link-time dependency on
 * an init function here and a typical "call foo_init first"
 * guitar lick.
 */

extern void *rpc_call_main_thread_cb_fn;

static clib_error_t *
rpc_api_hookup (vlib_main_t *vm)
{
  api_main_t *am = vlibapi_get_main ();
#define _(N, n)                                                               \
  vl_msg_api_set_handlers (                                                   \
    VL_API_##N, #n, vl_api_##n##_t_handler, vl_noop_handler, vl_noop_handler, \
    vl_api_##n##_t_print, sizeof (vl_api_##n##_t), 0 /* do not trace */,      \
    vl_api_##n##_t_print_json, vl_api_##n##_t_tojson,                         \
    vl_api_##n##_t_fromjson, vl_api_##n##_t_calc_size);
  foreach_rpc_api_msg;
#undef _

#define _(N, n)                                                               \
  vl_msg_api_set_handlers (                                                   \
    VL_API_##N, #n, vl_api_##n##_t_handler, vl_noop_handler, vl_noop_handler, \
    vl_api_##n##_t_print, sizeof (vl_api_##n##_t), 1 /* do trace */,          \
    vl_api_##n##_t_print_json, vl_api_##n##_t_tojson,                         \
    vl_api_##n##_t_fromjson, vl_api_##n##_t_calc_size);
  foreach_plugin_trace_msg;
#undef _

  vl_api_allow_msg_replay (am, VL_API_TRACE_PLUGIN_MSG_IDS, 0);

  /* No reason to halt the parade to create a trace record... */
  vl_api_set_msg_thread_safe (am, VL_API_TRACE_PLUGIN_MSG_IDS, 1);
  rpc_call_main_thread_cb_fn = vl_api_rpc_call_main_thread;
  return 0;
}

VLIB_API_INIT_FUNCTION (rpc_api_hookup);

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