aboutsummaryrefslogtreecommitdiffstats
path: root/src/vnet/sctp/builtin_client.c
blob: 12f053297c2182108bb81a204903cd751cb155a5 (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
/*
 * Copyright (c) 2018 SUSE LLC.
 * 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 <vnet/vnet.h>
#include <vnet/plugin/plugin.h>
#include <vnet/sctp/builtin_client.h>

#include <vlibapi/api.h>
#include <vlibmemory/api.h>
#include <vpp/app/version.h>

tclient_main_t tclient_main;

#define SCTP_BUILTIN_CLIENT_DBG (0)

static void
signal_evt_to_cli_i (int *code)
{
  tclient_main_t *tm = &tclient_main;
  ASSERT (vlib_get_thread_index () == 0);
  vlib_process_signal_event (tm->vlib_main, tm->cli_node_index, *code, 0);
}

static void
signal_evt_to_cli (int code)
{
  if (vlib_get_thread_index () != 0)
    vl_api_rpc_call_main_thread (signal_evt_to_cli_i, (u8 *) & code,
				 sizeof (code));
  else
    signal_evt_to_cli_i (&code);
}

static void
send_test_chunk (tclient_main_t * tm, session_t * s)
{
  u8 *test_data = tm->connect_test_data;
  int test_buf_offset;
  u32 bytes_this_chunk;
  session_fifo_event_t evt;
  svm_fifo_t *txf;
  int rv;

  ASSERT (vec_len (test_data) > 0);

  test_buf_offset = s->bytes_sent % vec_len (test_data);
  bytes_this_chunk = vec_len (test_data) - test_buf_offset;
  bytes_this_chunk = bytes_this_chunk < s->bytes_to_send
    ? bytes_this_chunk : s->bytes_to_send;

  txf = s->server_tx_fifo;
  rv = svm_fifo_enqueue_nowait (txf, bytes_this_chunk,
				test_data + test_buf_offset);

  /* If we managed to enqueue data... */
  if (rv > 0)
    {
      /* Account for it... */
      s->bytes_to_send -= rv;
      s->bytes_sent += rv;

      if (SCTP_BUILTIN_CLIENT_DBG)
	{
          /* *INDENT-OFF* */
          ELOG_TYPE_DECLARE (e) =
            {
              .format = "tx-enq: xfer %d bytes, sent %u remain %u",
              .format_args = "i4i4i4",
            };
          /* *INDENT-ON* */
	  struct
	  {
	    u32 data[3];
	  } *ed;
	  ed = ELOG_DATA (&vlib_global_main.elog_main, e);
	  ed->data[0] = rv;
	  ed->data[1] = s->bytes_sent;
	  ed->data[2] = s->bytes_to_send;
	}

      /* Poke the session layer */
      if (svm_fifo_set_event (txf))
	{
	  /* Fabricate TX event, send to vpp */
	  evt.fifo = txf;
	  evt.event_type = FIFO_EVENT_APP_TX;

	  if (svm_queue_add
	      (tm->vpp_event_queue[txf->master_thread_index], (u8 *) & evt,
	       0 /* do wait for mutex */ ))
	    clib_warning ("could not enqueue event");
	}
    }
}

static void
receive_test_chunk (tclient_main_t * tm, session_t * s)
{
  svm_fifo_t *rx_fifo = s->server_rx_fifo;
  u32 my_thread_index = vlib_get_thread_index ();
  int n_read, i;

  /* Allow enqueuing of new event */
  // svm_fifo_unset_event (rx_fifo);

  if (tm->test_bytes)
    {
      n_read = svm_fifo_dequeue_nowait (rx_fifo,
					vec_len (tm->rx_buf[my_thread_index]),
					tm->rx_buf[my_thread_index]);
    }
  else
    {
      n_read = svm_fifo_max_dequeue (rx_fifo);
      svm_fifo_dequeue_drop (rx_fifo, n_read);
    }

  if (SCTP_BUILTIN_CLIENT_DBG)
    clib_warning ("Receiving test chunk; n_read = %d", n_read);

  if (n_read > 0)
    {
      if (SCTP_BUILTIN_CLIENT_DBG)
	{
          /* *INDENT-OFF* */
          ELOG_TYPE_DECLARE (e) =
            {
              .format = "rx-deq: %d bytes",
              .format_args = "i4",
            };
          /* *INDENT-ON* */
	  struct
	  {
	    u32 data[1];
	  } *ed;
	  ed = ELOG_DATA (&vlib_global_main.elog_main, e);
	  ed->data[0] = n_read;
	}

      if (tm->test_bytes)
	{
	  for (i = 0; i < n_read; i++)
	    {
	      if (tm->rx_buf[my_thread_index][i]
		  != ((s->bytes_received + i) & 0xff))
		{
		  clib_warning ("read %d error at byte %lld, 0x%x not 0x%x",
				n_read, s->bytes_received + i,
				tm->rx_buf[my_thread_index][i],
				((s->bytes_received + i) & 0xff));
		  tm->test_failed = 1;
		}
	    }
	}

      if (s->bytes_to_receive < n_read)
	{
	  s->bytes_to_receive = 0;
	  s->bytes_received += s->bytes_received;
	}
      else
	{
	  s->bytes_to_receive -= n_read;
	  s->bytes_received += n_read;
	}
    }
}

static uword
builtin_client_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
			vlib_frame_t * frame)
{
  tclient_main_t *tm = &tclient_main;
  int my_thread_index = vlib_get_thread_index ();
  session_t *sp;
  int i;
  int delete_session;
  u32 *connection_indices;
  u32 *connections_this_batch;
  u32 nconnections_this_batch;

  connection_indices = tm->connection_index_by_thread[my_thread_index];
  connections_this_batch =
    tm->connections_this_batch_by_thread[my_thread_index];

  if ((tm->run_test == 0) ||
      ((vec_len (connection_indices) == 0)
       && vec_len (connections_this_batch) == 0))
    return 0;

  /* Grab another pile of connections */
  if (PREDICT_FALSE (vec_len (connections_this_batch) == 0))
    {
      nconnections_this_batch =
	clib_min (tm->connections_per_batch, vec_len (connection_indices));

      ASSERT (nconnections_this_batch > 0);
      vec_validate (connections_this_batch, nconnections_this_batch - 1);
      clib_memcpy (connections_this_batch,
		   connection_indices + vec_len (connection_indices)
		   - nconnections_this_batch,
		   nconnections_this_batch * sizeof (u32));
      _vec_len (connection_indices) -= nconnections_this_batch;
    }

  if (PREDICT_FALSE (tm->prev_conns != tm->connections_per_batch
		     && tm->prev_conns == vec_len (connections_this_batch)))
    {
      tm->repeats++;
      tm->prev_conns = vec_len (connections_this_batch);
      if (tm->repeats == 500000)
	{
	  clib_warning ("stuck clients");
	}
    }
  else
    {
      tm->prev_conns = vec_len (connections_this_batch);
      tm->repeats = 0;
    }

  for (i = 0; i < vec_len (connections_this_batch); i++)
    {
      delete_session = 1;

      sp = pool_elt_at_index (tm->sessions, connections_this_batch[i]);

      if (sp->bytes_to_send > 0)
	{
	  send_test_chunk (tm, sp);
	  delete_session = 0;
	}

      if (sp->bytes_to_receive > 0)
	{
	  receive_test_chunk (tm, sp);
	  delete_session = 0;
	}
      if (PREDICT_FALSE (delete_session == 1))
	{
	  u32 index, thread_index;
	  stream_session_t *s;

	  __sync_fetch_and_add (&tm->tx_total, sp->bytes_sent);
	  __sync_fetch_and_add (&tm->rx_total, sp->bytes_received);

	  session_parse_handle (sp->vpp_session_handle,
				&index, &thread_index);
	  s = session_get_if_valid (index, thread_index);

	  if (s)
	    {
	      vnet_disconnect_args_t _a, *a = &_a;
	      a->handle = session_handle (s);
	      a->app_index = tm->app_index;
	      vnet_disconnect_session (a);

	      vec_delete (connections_this_batch, 1, i);
	      i--;
	      __sync_fetch_and_add (&tm->ready_connections, -1);
	    }
	  else
	    clib_warning ("session AWOL?");

	  /* Kick the debug CLI process */
	  if (tm->ready_connections == 0)
	    {
	      signal_evt_to_cli (2);
	    }
	}
    }

  tm->connection_index_by_thread[my_thread_index] = connection_indices;
  tm->connections_this_batch_by_thread[my_thread_index] =
    connections_this_batch;
  return 0;
}

/* *INDENT-OFF* */
VLIB_REGISTER_NODE (builtin_sctp_client_node) =
{
  .function = builtin_client_node_fn,
  .name = "builtin-sctp-client",
  .type = VLIB_NODE_TYPE_INPUT,
  .state = VLIB_NODE_STATE_DISABLED,
};
/* *INDENT-ON* */

static int
create_api_loopback (tclient_main_t * tm)
{
  api_main_t *am = &api_main;
  vl_shmem_hdr_t *shmem_hdr;

  shmem_hdr = am->shmem_hdr;
  tm->vl_input_queue = shmem_hdr->vl_input_queue;
  tm->my_client_index =
    vl_api_memclnt_create_internal ("sctp_test_client", tm->vl_input_queue);
  return 0;
}

static int
sctp_test_clients_init (vlib_main_t * vm)
{
  tclient_main_t *tm = &tclient_main;
  vlib_thread_main_t *vtm = vlib_get_thread_main ();
  u32 num_threads;
  int i;

  if (create_api_loopback (tm))
    return -1;

  num_threads = 1 /* main thread */  + vtm->n_threads;

  /* Init test data. Big buffer */
  vec_validate (tm->connect_test_data, 1024 * 1024 - 1);
  for (i = 0; i < vec_len (tm->connect_test_data); i++)
    tm->connect_test_data[i] = i & 0xff;

  vec_validate (tm->rx_buf, num_threads - 1);
  for (i = 0; i < num_threads; i++)
    vec_validate (tm->rx_buf[i], vec_len (tm->connect_test_data) - 1);

  tm->is_init = 1;

  vec_validate (tm->connection_index_by_thread, vtm->n_vlib_mains);
  vec_validate (tm->connections_this_batch_by_thread, vtm->n_vlib_mains);
  vec_validate (tm->vpp_event_queue, vtm->n_vlib_mains);

  return 0;
}

static int
builtin_session_connected_callback (u32 app_index, u32 api_context,
				    stream_session_t * s, u8 is_fail)
{
  tclient_main_t *tm = &tclient_main;
  session_t *session;
  u32 session_index;
  u8 thread_index = vlib_get_thread_index ();

  if (is_fail)
    {
      clib_warning ("connection %d failed!", api_context);
      signal_evt_to_cli (-1);
      return 0;
    }

  ASSERT (s->thread_index == thread_index);

  if (!tm->vpp_event_queue[thread_index])
    tm->vpp_event_queue[thread_index] =
      session_manager_get_vpp_event_queue (thread_index);

  /*
   * Setup session
   */
  clib_spinlock_lock_if_init (&tm->sessions_lock);
  pool_get (tm->sessions, session);
  clib_spinlock_unlock_if_init (&tm->sessions_lock);

  memset (session, 0, sizeof (*session));
  session_index = session - tm->sessions;
  session->bytes_to_send = tm->bytes_to_send;
  session->bytes_to_receive = tm->no_return ? 0ULL : tm->bytes_to_send;
  session->server_rx_fifo = s->server_rx_fifo;
  session->server_rx_fifo->client_session_index = session_index;
  session->server_tx_fifo = s->server_tx_fifo;
  session->server_tx_fifo->client_session_index = session_index;
  session->vpp_session_handle = session_handle (s);

  vec_add1 (tm->connection_index_by_thread[thread_index], session_index);
  __sync_fetch_and_add (&tm->ready_connections, 1);
  if (tm->ready_connections == tm->expected_connections)
    {
      tm->run_test = 1;
      /* Signal the CLI process that the action is starting... */
      signal_evt_to_cli (1);
    }

  return 0;
}

static void
builtin_session_reset_callback (stream_session_t * s)
{
  if (s->session_state == SESSION_STATE_READY)
    clib_warning ("Reset active connection %U", format_stream_session, s, 2);
  stream_session_cleanup (s);
  return;
}

static int
builtin_session_create_callback (stream_session_t * s)
{
  return 0;
}

static void
builtin_session_disconnect_callback (stream_session_t * s)
{
  tclient_main_t *tm = &tclient_main;
  vnet_disconnect_args_t _a, *a = &_a;
  a->handle = session_handle (s);
  a->app_index = tm->app_index;
  vnet_disconnect_session (a);
  return;
}

static int
builtin_server_rx_callback (stream_session_t * s)
{
  return 0;
}

/* *INDENT-OFF* */
static session_cb_vft_t builtin_clients = {
  .session_reset_callback = builtin_session_reset_callback,
  .session_connected_callback = builtin_session_connected_callback,
  .session_accept_callback = builtin_session_create_callback,
  .session_disconnect_callback = builtin_session_disconnect_callback,
  .builtin_server_rx_callback = builtin_server_rx_callback
};
/* *INDENT-ON* */

static clib_error_t *
attach_builtin_test_clients_app (u8 * appns_id, u64 appns_flags,
				 u64 appns_secret)
{
  u32 prealloc_fifos, segment_size = 2 << 20;
  tclient_main_t *tm = &tclient_main;
  vnet_app_attach_args_t _a, *a = &_a;
  u64 options[16];
  clib_error_t *error = 0;

  memset (a, 0, sizeof (*a));
  memset (options, 0, sizeof (options));

  a->api_client_index = tm->my_client_index;
  a->session_cb_vft = &builtin_clients;

  prealloc_fifos = tm->prealloc_fifos ? tm->expected_connections : 1;

  if (tm->private_segment_size)
    segment_size = tm->private_segment_size;

  options[APP_OPTIONS_ACCEPT_COOKIE] = 0x12345678;
  options[APP_OPTIONS_SEGMENT_SIZE] = segment_size;
  options[APP_OPTIONS_RX_FIFO_SIZE] = tm->fifo_size;
  options[APP_OPTIONS_TX_FIFO_SIZE] = tm->fifo_size;
  options[APP_OPTIONS_PRIVATE_SEGMENT_COUNT] = tm->private_segment_count;
  options[APP_OPTIONS_PREALLOC_FIFO_PAIRS] = prealloc_fifos;

  options[APP_OPTIONS_FLAGS] = APP_OPTIONS_FLAGS_IS_BUILTIN;
  if (appns_id)
    {
      options[APP_OPTIONS_FLAGS] |= appns_flags;
      options[APP_OPTIONS_NAMESPACE_SECRET] = appns_secret;
    }
  a->options = options;
  a->namespace_id = appns_id;

  if ((error = vnet_application_attach (a)))
    return error;

  tm->app_index = a->app_index;
  return 0;
}

static void *
tclient_thread_fn (void *arg)
{
  return 0;
}

/** Start a transmit thread */
int
start_tx_pthread_sctp (tclient_main_t * tm)
{
  if (tm->client_thread_handle == 0)
    {
      int rv = pthread_create (&tm->client_thread_handle,
			       NULL /*attr */ ,
			       tclient_thread_fn, 0);
      if (rv)
	{
	  tm->client_thread_handle = 0;
	  return -1;
	}
    }
  return 0;
}

clib_error_t *
clients_connect_sctp (vlib_main_t * vm, u8 * uri, u32 n_clients)
{
  tclient_main_t *tm = &tclient_main;
  vnet_connect_args_t _a, *a = &_a;
  clib_error_t *error = 0;
  int i;
  for (i = 0; i < n_clients; i++)
    {
      memset (a, 0, sizeof (*a));

      a->uri = (char *) uri;
      a->api_context = i;
      a->app_index = tm->app_index;
      a->mp = 0;

      if ((error = vnet_connect_uri (a)))
	return error;


      /* Crude pacing for call setups  */
      if ((i % 4) == 0)
	vlib_process_suspend (vm, 10e-6);
      ASSERT (i + 1 >= tm->ready_connections);
      while (i + 1 - tm->ready_connections > 1000)
	{
	  vlib_process_suspend (vm, 100e-6);
	}
    }
  return 0;
}

#define CLI_OUTPUT(_fmt, _args...) 			\
  if (!tm->no_output)  					\
    vlib_cli_output(vm, _fmt, ##_args)

static clib_error_t *
test_sctp_clients_command_fn (vlib_main_t * vm,
			      unformat_input_t * input,
			      vlib_cli_command_t * cmd)
{
  tclient_main_t *tm = &tclient_main;
  vlib_thread_main_t *thread_main = vlib_get_thread_main ();
  uword *event_data = 0, event_type;
  u8 *default_connect_uri = (u8 *) "sctp://6.0.1.1/1234", *uri, *appns_id = 0;
  u64 tmp, total_bytes, appns_flags = 0, appns_secret = 0;
  f64 test_timeout = 20.0, syn_timeout = 20.0, delta;
  f64 time_before_connects;
  u32 n_clients = 1;
  int preallocate_sessions = 0;
  char *transfer_type;
  clib_error_t *error = 0;
  int i;

  tm->bytes_to_send = 8192;
  tm->no_return = 0;
  tm->fifo_size = 64 << 10;
  tm->connections_per_batch = 1000;
  tm->private_segment_count = 0;
  tm->private_segment_size = 0;
  tm->no_output = 0;
  tm->test_bytes = 0;
  tm->test_failed = 0;
  tm->vlib_main = vm;
  if (thread_main->n_vlib_mains > 1)
    clib_spinlock_init (&tm->sessions_lock);
  vec_free (tm->connect_uri);

  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (input, "nclients %d", &n_clients))
	;
      else if (unformat (input, "mbytes %lld", &tmp))
	tm->bytes_to_send = tmp << 20;
      else if (unformat (input, "gbytes %lld", &tmp))
	tm->bytes_to_send = tmp << 30;
      else if (unformat (input, "bytes %lld", &tm->bytes_to_send))
	;
      else if (unformat (input, "uri %s", &tm->connect_uri))
	;
      else if (unformat (input, "test-timeout %f", &test_timeout))
	;
      else if (unformat (input, "syn-timeout %f", &syn_timeout))
	;
      else if (unformat (input, "no-return"))
	tm->no_return = 1;
      else if (unformat (input, "fifo-size %d", &tm->fifo_size))
	tm->fifo_size <<= 10;
      else if (unformat (input, "private-segment-count %d",
			 &tm->private_segment_count))
	;
      else if (unformat (input, "private-segment-size %U",
			 unformat_memory_size, &tmp))
	{
	  if (tmp >= 0x100000000ULL)
	    return clib_error_return
	      (0, "private segment size %lld (%llu) too large", tmp, tmp);
	  tm->private_segment_size = tmp;
	}
      else if (unformat (input, "preallocate-fifos"))
	tm->prealloc_fifos = 1;
      else if (unformat (input, "preallocate-sessions"))
	preallocate_sessions = 1;
      else
	if (unformat (input, "client-batch %d", &tm->connections_per_batch))
	;
      else if (unformat (input, "appns %_%v%_", &appns_id))
	;
      else if (unformat (input, "all-scope"))
	appns_flags |= (APP_OPTIONS_FLAGS_USE_GLOBAL_SCOPE
			| APP_OPTIONS_FLAGS_USE_LOCAL_SCOPE);
      else if (unformat (input, "local-scope"))
	appns_flags = APP_OPTIONS_FLAGS_USE_LOCAL_SCOPE;
      else if (unformat (input, "global-scope"))
	appns_flags = APP_OPTIONS_FLAGS_USE_GLOBAL_SCOPE;
      else if (unformat (input, "secret %lu", &appns_secret))
	;
      else if (unformat (input, "no-output"))
	tm->no_output = 1;
      else if (unformat (input, "test-bytes"))
	tm->test_bytes = 1;
      else
	return clib_error_return (0, "unknown input `%U'",
				  format_unformat_error, input);
    }

  /* Store cli process node index for signalling */
  tm->cli_node_index = vlib_get_current_process (vm)->node_runtime.node_index;

  if (tm->is_init == 0)
    {
      if (sctp_test_clients_init (vm))
	return clib_error_return (0, "failed init");
    }

  tm->ready_connections = 0;
  tm->expected_connections = n_clients;
  tm->rx_total = 0;
  tm->tx_total = 0;

  uri = default_connect_uri;
  if (tm->connect_uri)
    uri = tm->connect_uri;

#if SCTP_BUILTIN_CLIENT_PTHREAD
  start_tx_pthread ();
#endif

  vlib_worker_thread_barrier_sync (vm);
  vnet_session_enable_disable (vm, 1 /* turn on SCTP, etc. */ );
  vlib_worker_thread_barrier_release (vm);

  if (tm->test_client_attached == 0)
    {
      if ((error = attach_builtin_test_clients_app (appns_id, appns_flags,
						    appns_secret)))
	{
	  vec_free (appns_id);
	  clib_error_report (error);
	  return error;
	}
      vec_free (appns_id);
    }
  tm->test_client_attached = 1;

  /* Turn on the builtin client input nodes */
  for (i = 0; i < thread_main->n_vlib_mains; i++)
    vlib_node_set_state (vlib_mains[i], builtin_sctp_client_node.index,
			 VLIB_NODE_STATE_POLLING);

  if (preallocate_sessions)
    {
      session_t *sp __attribute__ ((unused));
      for (i = 0; i < n_clients; i++)
	pool_get (tm->sessions, sp);
      for (i = 0; i < n_clients; i++)
	pool_put_index (tm->sessions, i);
    }

  /* Fire off connect requests */
  time_before_connects = vlib_time_now (vm);
  if ((error = clients_connect_sctp (vm, uri, n_clients)))
    return error;

  /* Park until the sessions come up, or ten seconds elapse... */
  vlib_process_wait_for_event_or_clock (vm, syn_timeout);

  event_type = vlib_process_get_events (vm, &event_data);
  switch (event_type)
    {
    case ~0:
      CLI_OUTPUT ("Timeout with only %d sessions active...",
		  tm->ready_connections);
      error =
	clib_error_return (0, "failed: syn timeout (%f) with %d sessions",
			   syn_timeout, tm->ready_connections);
      goto cleanup;

    case 1:
      delta = vlib_time_now (vm) - time_before_connects;
      if (delta != 0.0)
	CLI_OUTPUT ("%d three-way handshakes in %.2f seconds %.2f/s",
		    n_clients, delta, ((f64) n_clients) / delta);

      tm->test_start_time = vlib_time_now (tm->vlib_main);
      CLI_OUTPUT ("Test started at %.6f", tm->test_start_time);
      break;

    default:
      CLI_OUTPUT ("unexpected event(1): %d", event_type);
      error = clib_error_return (0, "failed: unexpected event(1): %d",
				 event_type);
      goto cleanup;
    }

  /* Now wait for the sessions to finish... */
  vlib_process_wait_for_event_or_clock (vm, test_timeout);
  event_type = vlib_process_get_events (vm, &event_data);
  switch (event_type)
    {
    case ~0:
      CLI_OUTPUT ("Timeout with %d sessions still active...",
		  tm->ready_connections);
      error = clib_error_return (0, "failed: timeout with %d sessions",
				 tm->ready_connections);
      goto cleanup;

    case 2:
      tm->test_end_time = vlib_time_now (vm);
      CLI_OUTPUT ("Test finished at %.6f", tm->test_end_time);
      break;

    default:
      CLI_OUTPUT ("unexpected event(2): %d", event_type);
      error = clib_error_return (0, "failed: unexpected event(2): %d",
				 event_type);
      goto cleanup;
    }

  delta = tm->test_end_time - tm->test_start_time;

  if (delta != 0.0)
    {
      total_bytes = (tm->no_return ? tm->tx_total : tm->rx_total);
      transfer_type = tm->no_return ? "half-duplex" : "full-duplex";
      CLI_OUTPUT ("%lld bytes (%lld mbytes, %lld gbytes) in %.2f seconds",
		  total_bytes, total_bytes / (1ULL << 20),
		  total_bytes / (1ULL << 30), delta);
      CLI_OUTPUT ("%.2f bytes/second %s", ((f64) total_bytes) / (delta),
		  transfer_type);
      CLI_OUTPUT ("%.4f gbit/second %s",
		  (((f64) total_bytes * 8.0) / delta / 1e9), transfer_type);
    }
  else
    {
      CLI_OUTPUT ("zero delta-t?");
      error = clib_error_return (0, "failed: zero delta-t");
      goto cleanup;
    }

  if (tm->test_bytes && tm->test_failed)
    error = clib_error_return (0, "failed: test bytes");

cleanup:
  tm->run_test = 0;
  for (i = 0; i < vec_len (tm->connection_index_by_thread); i++)
    {
      vec_reset_length (tm->connection_index_by_thread[i]);
      vec_reset_length (tm->connections_this_batch_by_thread[i]);
    }

  pool_free (tm->sessions);

  /* Detach the application, so we can use different fifo sizes next time */
  if (tm->test_client_attached)
    {
      vnet_app_detach_args_t _da, *da = &_da;
      int rv;

      da->app_index = tm->app_index;
      rv = vnet_application_detach (da);
      if (rv)
	{
	  error = clib_error_return (0, "failed: app detach");
	  CLI_OUTPUT ("WARNING: app detach failed...");
	}
      tm->test_client_attached = 0;
      tm->app_index = ~0;
    }
  if (error)
    CLI_OUTPUT ("test failed");
  return error;
}

/* *INDENT-OFF* */
VLIB_CLI_COMMAND (test_clients_command, static) =
{
  .path = "test sctp clients",
  .short_help = "test sctp clients [nclients %d] [[m|g]bytes <bytes>] "
      "[test-timeout <time>][syn-timeout <time>][no-return][fifo-size <size>]"
      "[private-segment-count <count>][private-segment-size <bytes>[m|g]]"
      "[preallocate-fifos][preallocate-sessions][client-batch <batch-size>]"
      "[uri <sctp://ip/port>][test-bytes][no-output]",
  .function = test_sctp_clients_command_fn,
  .is_mp_safe = 1,
};
/* *INDENT-ON* */

clib_error_t *
sctp_test_clients_main_init (vlib_main_t * vm)
{
  tclient_main_t *tm = &tclient_main;
  tm->is_init = 0;
  return 0;
}

VLIB_INIT_FUNCTION (sctp_test_clients_main_init);

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