summaryrefslogtreecommitdiffstats
path: root/src/vnet/session/session_api.c
diff options
context:
space:
mode:
authorFlorin Coras <fcoras@cisco.com>2018-12-17 23:08:14 -0800
committerDamjan Marion <dmarion@me.com>2018-12-19 08:33:35 +0000
commite2ea193171f4701aa575379da0e1bac16a85aa33 (patch)
tree29aa3ac276e8e4527f3147b029acb226dd40ba72 /src/vnet/session/session_api.c
parent6fbef2322870bbe1768537caecc3ca06bfd70dd7 (diff)
session: handle close before app accept reply
Change-Id: Ic35bbf55851087d70bfacc1eab4dea4285f98c86 Signed-off-by: Florin Coras <fcoras@cisco.com>
Diffstat (limited to 'src/vnet/session/session_api.c')
-rwxr-xr-xsrc/vnet/session/session_api.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/vnet/session/session_api.c b/src/vnet/session/session_api.c
index 40fc41629d4..2d20d5f697b 100755
--- a/src/vnet/session/session_api.c
+++ b/src/vnet/session/session_api.c
@@ -408,6 +408,7 @@ mq_try_lock_and_alloc_msg (svm_msg_q_t * app_mq, svm_msg_q_msg_t * msg)
if (!rv)
return 0;
try++;
+ usleep (1);
}
clib_warning ("failed to alloc msg");
return -1;
>169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 
/*
 * Copyright (c) 2019 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 <stdio.h>
#include <signal.h>

#include <vnet/session/application_interface.h>
#include <vlibmemory/api.h>

#include <vpp/api/vpe_msg_enum.h>
#include <svm/fifo_segment.h>

#define vl_typedefs		/* define message structures */
#include <vpp/api/vpe_all_api_h.h>
#undef vl_typedefs

/* declare message handlers for each api */

#define vl_endianfun		/* define message structures */
#include <vpp/api/vpe_all_api_h.h>
#undef vl_endianfun

/* instantiate all the print functions we know about */
#define vl_print(handle, ...)
#define vl_printfun
#include <vpp/api/vpe_all_api_h.h>
#undef vl_printfun

#define TCP_ECHO_DBG 0
#define DBG(_fmt,_args...)			\
    if (TCP_ECHO_DBG) 				\
      clib_warning (_fmt, _args)

typedef struct
{
  CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
#define _(type, name) type name;
  foreach_app_session_field
#undef _
  u64 vpp_session_handle;
  u64 bytes_sent;
  u64 bytes_to_send;
  volatile u64 bytes_received;
  volatile u64 bytes_to_receive;
  f64 start;
} echo_session_t;

typedef enum
{
  STATE_START,
  STATE_ATTACHED,
  STATE_LISTEN,
  STATE_READY,
  STATE_DISCONNECTING,
  STATE_FAILED,
  STATE_DETACHED
} connection_state_t;

typedef struct
{
  /* vpe input queue */
  svm_queue_t *vl_input_queue;

  /* API client handle */
  u32 my_client_index;

  /* The URI we're playing with */
  u8 *uri;

  /* Session pool */
  echo_session_t *sessions;

  /* Hash table for disconnect processing */
  uword *session_index_by_vpp_handles;

  /* intermediate rx buffer */
  u8 *rx_buf;

  /* URI for slave's connect */
  u8 *connect_uri;

  u32 connected_session_index;

  int i_am_master;

  /* drop all packets */
  int no_return;

  /* Our event queue */
  svm_msg_q_t *our_event_queue;

  u8 *socket_name;

  pid_t my_pid;

  /* For deadman timers */
  clib_time_t clib_time;

  /* State of the connection, shared between msg RX thread and main thread */
  volatile connection_state_t state;

  /* Signal variables */
  volatile int time_to_stop;
  volatile int time_to_print_stats;

  u32 configured_segment_size;

  /* VNET_API_ERROR_FOO -> "Foo" hash table */
  uword *error_string_by_error_number;

  u8 *connect_test_data;
  pthread_t *client_thread_handles;
  u32 *thread_args;
  u32 client_bytes_received;
  u8 test_return_packets;
  u64 bytes_to_send;
  u32 fifo_size;

  u32 n_clients;
  u64 tx_total;
  u64 rx_total;

  volatile u32 n_clients_connected;
  volatile u32 n_active_clients;


  /** Flag that decides if socket, instead of svm, api is used to connect to
   * vpp. If sock api is used, shm binary api is subsequently bootstrapped
   * and all other messages are exchanged using shm IPC. */
  u8 use_sock_api;

  fifo_segment_main_t segment_main;
} echo_main_t;

echo_main_t echo_main;

#if CLIB_DEBUG > 0
#define NITER 10000
#else
#define NITER 4000000
#endif

static u8 *
format_api_error (u8 * s, va_list * args)
{
  echo_main_t *em = &echo_main;
  i32 error = va_arg (*args, u32);
  uword *p;

  p = hash_get (em->error_string_by_error_number, -error);

  if (p)
    s = format (s, "%s", p[0]);
  else
    s = format (s, "%d", error);
  return s;
}

static void
init_error_string_table (echo_main_t * em)
{
  em->error_string_by_error_number = hash_create (0, sizeof (uword));

#define _(n,v,s) hash_set (em->error_string_by_error_number, -v, s);
  foreach_vnet_api_error;
#undef _

  hash_set (em->error_string_by_error_number, 99, "Misc");
}

static void handle_mq_event (session_event_t * e);

static int
wait_for_state_change (echo_main_t * em, connection_state_t state)
{
  svm_msg_q_msg_t msg;
  session_event_t *e;
  f64 timeout;

#if CLIB_DEBUG > 0
#define TIMEOUT 600.0
#else
#define TIMEOUT 600.0
#endif

  timeout = clib_time_now (&em->clib_time) + TIMEOUT;

  while (clib_time_now (&em->clib_time) < timeout)
    {
      if (em->state == state)
	return 0;
      if (em->state == STATE_FAILED)
	return -1;
      if (em->time_to_stop == 1)
	return 0;
      if (!em->our_event_queue || em->state < STATE_ATTACHED)
	continue;

      if (svm_msg_q_sub (em->our_event_queue, &msg, SVM_Q_NOWAIT, 0))
	continue;
      e = svm_msg_q_msg_data (em->our_event_queue, &msg);
      handle_mq_event (e);
      svm_msg_q_free_msg (em->our_event_queue, &msg);
    }
  clib_warning ("timeout waiting for state %d", state);
  return -1;
}

void
application_send_attach (echo_main_t * em)
{
  vl_api_application_attach_t *bmp;
  vl_api_application_tls_cert_add_t *cert_mp;
  vl_api_application_tls_key_add_t *key_mp;

  bmp = vl_msg_api_alloc (sizeof (*bmp));
  clib_memset (bmp, 0, sizeof (*bmp));

  bmp->_vl_msg_id = ntohs (VL_API_APPLICATION_ATTACH);
  bmp->client_index = em->my_client_index;
  bmp->context = ntohl (0xfeedface);
  bmp->options[APP_OPTIONS_FLAGS] = APP_OPTIONS_FLAGS_ACCEPT_REDIRECT;
  bmp->options[APP_OPTIONS_FLAGS] |= APP_OPTIONS_FLAGS_ADD_SEGMENT;
  bmp->options[APP_OPTIONS_PREALLOC_FIFO_PAIRS] = 16;
  bmp->options[APP_OPTIONS_RX_FIFO_SIZE] = em->fifo_size;
  bmp->options[APP_OPTIONS_TX_FIFO_SIZE] = em->fifo_size;
  bmp->options[APP_OPTIONS_ADD_SEGMENT_SIZE] = 128 << 20;
  bmp->options[APP_OPTIONS_SEGMENT_SIZE] = 256 << 20;
  bmp->options[APP_OPTIONS_EVT_QUEUE_SIZE] = 256;
  vl_msg_api_send_shmem (em->vl_input_queue, (u8 *) & bmp);

  cert_mp = vl_msg_api_alloc (sizeof (*cert_mp) + test_srv_crt_rsa_len);
  clib_memset (cert_mp, 0, sizeof (*cert_mp));
  cert_mp->_vl_msg_id = ntohs (VL_API_APPLICATION_TLS_CERT_ADD);
  cert_mp->client_index = em->my_client_index;
  cert_mp->context = ntohl (0xfeedface);
  cert_mp->cert_len = clib_host_to_net_u16 (test_srv_crt_rsa_len);
  clib_memcpy_fast (cert_mp->cert, test_srv_crt_rsa, test_srv_crt_rsa_len);
  vl_msg_api_send_shmem (em->vl_input_queue, (u8 *) & cert_mp);

  key_mp = vl_msg_api_alloc (sizeof (*key_mp) + test_srv_key_rsa_len);
  clib_memset (key_mp, 0, sizeof (*key_mp) + test_srv_key_rsa_len);
  key_mp->_vl_msg_id = ntohs (VL_API_APPLICATION_TLS_KEY_ADD);
  key_mp->client_index = em->my_client_index;
  key_mp->context = ntohl (0xfeedface);
  key_mp->key_len = clib_host_to_net_u16 (test_srv_key_rsa_len);
  clib_memcpy_fast (key_mp->key, test_srv_key_rsa, test_srv_key_rsa_len);
  vl_msg_api_send_shmem (em->vl_input_queue, (u8 *) & key_mp);
}

static int
application_attach (echo_main_t * em)
{
  application_send_attach (em);
  if (wait_for_state_change (em, STATE_ATTACHED))
    {
      clib_warning ("timeout waiting for STATE_ATTACHED");
      return -1;
    }
  return 0;
}

void
application_detach (echo_main_t * em)
{
  vl_api_application_detach_t *bmp;
  bmp = vl_msg_api_alloc (sizeof (*bmp));
  clib_memset (bmp, 0, sizeof (*bmp));

  bmp->_vl_msg_id = ntohs (VL_API_APPLICATION_DETACH);
  bmp->client_index = em->my_client_index;
  bmp->context = ntohl (0xfeedface);
  vl_msg_api_send_shmem (em->vl_input_queue, (u8 *) & bmp);

  DBG ("%s", "Sent detach");
}

static int
ssvm_segment_attach (char *name, ssvm_segment_type_t type, int fd)
{
  fifo_segment_create_args_t _a, *a = &_a;
  fifo_segment_main_t *sm = &echo_main.segment_main;
  int rv;

  clib_memset (a, 0, sizeof (*a));
  a->segment_name = (char *) name;
  a->segment_type = type;

  if (type == SSVM_SEGMENT_MEMFD)
    a->memfd_fd = fd;

  if ((rv = fifo_segment_attach (sm, a)))
    {
      clib_warning ("svm_fifo_segment_attach ('%s') failed", name);
      return rv;
    }

  vec_reset_length (a->new_segment_indices);
  return 0;
}

static void
vl_api_application_attach_reply_t_handler (vl_api_application_attach_reply_t *
					   mp)
{
  echo_main_t *em = &echo_main;
  int *fds = 0;
  u32 n_fds = 0;

  if (mp->retval)
    {
      clib_warning ("attach failed: %U", format_api_error,
		    clib_net_to_host_u32 (mp->retval));
      goto failed;
    }

  if (mp->segment_name_length == 0)
    {
      clib_warning ("segment_name_length zero");
      goto failed;
    }

  ASSERT (mp->app_event_queue_address);
  em->our_event_queue = uword_to_pointer (mp->app_event_queue_address,
					  svm_msg_q_t *);

  if (mp->n_fds)
    {
      vec_validate (fds, mp->n_fds);
      vl_socket_client_recv_fd_msg (fds, mp->n_fds, 5);

      if (mp->fd_flags & SESSION_FD_F_VPP_MQ_SEGMENT)
	if (ssvm_segment_attach (0, SSVM_SEGMENT_MEMFD, fds[n_fds++]))
	  goto failed;

      if (mp->fd_flags & SESSION_FD_F_MEMFD_SEGMENT)
	if (ssvm_segment_attach ((char *) mp->segment_name,
				 SSVM_SEGMENT_MEMFD, fds[n_fds++]))
	  goto failed;

      if (mp->fd_flags & SESSION_FD_F_MQ_EVENTFD)
	svm_msg_q_set_consumer_eventfd (em->our_event_queue, fds[n_fds++]);

      vec_free (fds);
    }
  else
    {
      if (ssvm_segment_attach ((char *) mp->segment_name, SSVM_SEGMENT_SHM,
			       -1))
	goto failed;
    }

  em->state = STATE_ATTACHED;
  return;
failed:
  em->state = STATE_FAILED;
  return;
}

static void
vl_api_application_detach_reply_t_handler (vl_api_application_detach_reply_t *
					   mp)
{
  if (mp->retval)
    clib_warning ("detach returned with err: %d", mp->retval);
  echo_main.state = STATE_DETACHED;
}

static void
stop_signal (int signum)
{
  echo_main_t *um = &echo_main;
  um->time_to_stop = 1;
}

static void
stats_signal (int signum)
{
  echo_main_t *um = &echo_main;
  um->time_to_print_stats = 1;
}

static clib_error_t *
setup_signal_handlers (void)
{
  signal (SIGUSR2, stats_signal);
  signal (SIGINT, stop_signal);
  signal (SIGQUIT, stop_signal);
  signal (SIGTERM, stop_signal);
  return 0;
}

void
vlib_cli_output (struct vlib_main_t *vm, char *fmt, ...)
{
  clib_warning ("BUG");
}

int
connect_to_vpp (char *name)
{
  echo_main_t *em = &echo_main;
  api_main_t *am = &api_main;

  if (em->use_sock_api)
    {
      if (vl_socket_client_connect ((char *) em->socket_name, name,
				    0 /* default rx, tx buffer */ ))
	{
	  clib_warning ("socket connect failed");
	  return -1;
	}

      if (vl_socket_client_init_shm (0, 1 /* want_pthread */ ))
	{
	  clib_warning ("init shm api failed");
	  return -1;
	}
    }
  else
    {
      if (vl_client_connect_to_vlib ("/vpe-api", name, 32) < 0)
	{
	  clib_warning ("shmem connect failed");
	  return -1;
	}
    }
  em->vl_input_queue = am->shmem_hdr->vl_input_queue;
  em->my_client_index = am->my_client_index;
  return 0;
}

void
disconnect_from_vpp (echo_main_t * em)
{
  if (em->use_sock_api)
    vl_socket_client_disconnect ();
  else
    vl_client_disconnect_from_vlib ();
}

static void
vl_api_map_another_segment_t_handler (vl_api_map_another_segment_t * mp)
{
  fifo_segment_main_t *sm = &echo_main.segment_main;
  fifo_segment_create_args_t _a, *a = &_a;
  int rv;

  clib_memset (a, 0, sizeof (*a));
  a->segment_name = (char *) mp->segment_name;
  a->segment_size = mp->segment_size;
  /* Attach to the segment vpp created */
  rv = fifo_segment_attach (sm, a);
  if (rv)
    {
      clib_warning ("svm_fifo_segment_attach ('%s') failed",
		    mp->segment_name);
      return;
    }
  clib_warning ("Mapped new segment '%s' size %d", mp->segment_name,
		mp->segment_size);
}

static void
session_print_stats (echo_main_t * em, echo_session_t * session)
{
  f64 deltat;
  u64 bytes;

  deltat = clib_time_now (&em->clib_time) - session->start;
  bytes = em->i_am_master ? session->bytes_received : em->bytes_to_send;
  fformat (stdout, "Finished in %.6f\n", deltat);
  fformat (stdout, "%.4f Gbit/second\n", (bytes * 8.0) / deltat / 1e9);
}

static void
test_recv_bytes (echo_session_t * s, u8 * rx_buf, u32 n_read)
{
  int i;
  for (i = 0; i < n_read; i++)
    {
      if (rx_buf[i] != ((s->bytes_received + i) & 0xff))
	{
	  clib_warning ("error at byte %lld, 0x%x not 0x%x",
			s->bytes_received + i, rx_buf[i],
			((s->bytes_received + i) & 0xff));
	}
    }
}

static void
recv_data_chunk (echo_main_t * em, echo_session_t * s, u8 * rx_buf)
{
  int n_to_read, n_read;

  n_to_read = svm_fifo_max_dequeue (s->rx_fifo);
  if (!n_to_read)
    return;

  do
    {
      n_read = app_recv_stream ((app_session_t *) s, rx_buf,
				vec_len (rx_buf));

      if (n_read > 0)
	{
	  if (em->test_return_packets)
	    test_recv_bytes (s, rx_buf, n_read);

	  n_to_read -= n_read;

	  s->bytes_received += n_read;
	  s->bytes_to_receive -= n_read;
	}
      else
	break;
    }
  while (n_to_read > 0);
}

static void
send_data_chunk (echo_main_t * em, echo_session_t * s)
{
  u64 test_buf_len, bytes_this_chunk, test_buf_offset;
  u8 *test_data = em->connect_test_data;
  int n_sent;

  test_buf_len = vec_len (test_data);
  test_buf_offset = s->bytes_sent % test_buf_len;
  bytes_this_chunk = clib_min (test_buf_len - test_buf_offset,
			       s->bytes_to_send);

  n_sent = app_send_stream ((app_session_t *) s, test_data + test_buf_offset,
			    bytes_this_chunk, 0);

  if (n_sent > 0)
    {
      s->bytes_to_send -= n_sent;
      s->bytes_sent += n_sent;
    }
}

/*
 * Rx/Tx polling thread per connection
 */
static void *
client_thread_fn (void *arg)
{
  echo_main_t *em = &echo_main;
  static u8 *rx_buf = 0;
  u32 session_index = *(u32 *) arg;
  echo_session_t *s;

  vec_validate (rx_buf, 1 << 20);

  while (!em->time_to_stop && em->state != STATE_READY)
    ;

  s = pool_elt_at_index (em->sessions, session_index);
  while (!em->time_to_stop)
    {
      send_data_chunk (em, s);
      recv_data_chunk (em, s, rx_buf);
      if (!s->bytes_to_send && !s->bytes_to_receive)
	break;
    }

  clib_warning ("GOT OUT");
  DBG ("session %d done", session_index);
  em->tx_total += s->bytes_sent;
  em->rx_total += s->bytes_received;
  em->n_active_clients--;

  pthread_exit (0);
}

void
client_send_connect (echo_main_t * em)
{
  vl_api_connect_uri_t *cmp;
  cmp = vl_msg_api_alloc (sizeof (*cmp));
  clib_memset (cmp, 0, sizeof (*cmp));

  cmp->_vl_msg_id = ntohs (VL_API_CONNECT_URI);
  cmp->client_index = em->my_client_index;
  cmp->context = ntohl (0xfeedface);
  memcpy (cmp->uri, em->connect_uri, vec_len (em->connect_uri));
  vl_msg_api_send_shmem (em->vl_input_queue, (u8 *) & cmp);
}

void
client_send_disconnect (echo_main_t * em, echo_session_t * s)
{
  vl_api_disconnect_session_t *dmp;
  dmp = vl_msg_api_alloc (sizeof (*dmp));
  clib_memset (dmp, 0, sizeof (*dmp));
  dmp->_vl_msg_id = ntohs (VL_API_DISCONNECT_SESSION);
  dmp->client_index = em->my_client_index;
  dmp->handle = s->vpp_session_handle;
  vl_msg_api_send_shmem (em->vl_input_queue, (u8 *) & dmp);
}

int
client_disconnect (echo_main_t * em, echo_session_t * s)
{
  client_send_disconnect (em, s);
  pool_put (em->sessions, s);
  clib_memset (s, 0xfe, sizeof (*s));
  return 0;
}

static void
session_bound_handler (session_bound_msg_t * mp)
{
  echo_main_t *em = &echo_main;

  if (mp->retval)
    {
      clib_warning ("bind failed: %U", format_api_error,
		    clib_net_to_host_u32 (mp->retval));
      em->state = STATE_FAILED;
      return;
    }

  clib_warning ("listening on %U:%u", format_ip46_address, mp->lcl_ip,
		mp->lcl_is_ip4 ? IP46_TYPE_IP4 : IP46_TYPE_IP6,
		clib_net_to_host_u16 (mp->lcl_port));
  em->state = STATE_READY;
}

static void
session_accepted_handler (session_accepted_msg_t * mp)
{
  app_session_evt_t _app_evt, *app_evt = &_app_evt;
  session_accepted_reply_msg_t *rmp;
  svm_fifo_t *rx_fifo, *tx_fifo;
  echo_main_t *em = &echo_main;
  echo_session_t *session;
  static f64 start_time;
  u32 session_index;
  u8 *ip_str;

  if (start_time == 0.0)
    start_time = clib_time_now (&em->clib_time);

  ip_str = format (0, "%U", format_ip46_address, &mp->rmt.ip, mp->rmt.is_ip4);
  clib_warning ("Accepted session from: %s:%d", ip_str,
		clib_net_to_host_u16 (mp->rmt.port));

  /* Allocate local session and set it up */
  pool_get (em->sessions, session);
  session_index = session - em->sessions;

  rx_fifo = uword_to_pointer (mp->server_rx_fifo, svm_fifo_t *);
  rx_fifo->client_session_index = session_index;
  tx_fifo = uword_to_pointer (mp->server_tx_fifo, svm_fifo_t *);
  tx_fifo->client_session_index = session_index;

  session->rx_fifo = rx_fifo;
  session->tx_fifo = tx_fifo;
  session->vpp_evt_q = uword_to_pointer (mp->vpp_event_queue_address,
					 svm_msg_q_t *);

  /* Add it to lookup table */
  hash_set (em->session_index_by_vpp_handles, mp->handle, session_index);

  em->state = STATE_READY;

  /* Stats printing */
  if (pool_elts (em->sessions) && (pool_elts (em->sessions) % 20000) == 0)
    {
      f64 now = clib_time_now (&em->clib_time);
      fformat (stdout, "%d active sessions in %.2f seconds, %.2f/sec...\n",
	       pool_elts (em->sessions), now - start_time,
	       (f64) pool_elts (em->sessions) / (now - start_time));
    }

  /*
   * Send accept reply to vpp
   */
  app_alloc_ctrl_evt_to_vpp (session->vpp_evt_q, app_evt,
			     SESSION_CTRL_EVT_ACCEPTED_REPLY);
  rmp = (session_accepted_reply_msg_t *) app_evt->evt->data;
  rmp->handle = mp->handle;
  rmp->context = mp->context;
  app_send_ctrl_evt_to_vpp (session->vpp_evt_q, app_evt);

  session->bytes_received = 0;
  session->start = clib_time_now (&em->clib_time);
}

static void
session_connected_handler (session_connected_msg_t * mp)
{
  echo_main_t *em = &echo_main;
  echo_session_t *session;
  u32 session_index;
  svm_fifo_t *rx_fifo, *tx_fifo;
  int rv;

  if (mp->retval)
    {
      clib_warning ("connection failed with code: %U", format_api_error,
		    clib_net_to_host_u32 (mp->retval));
      em->state = STATE_FAILED;
      return;
    }

  /*
   * Setup session
   */

  pool_get (em->sessions, session);
  clib_memset (session, 0, sizeof (*session));
  session_index = session - em->sessions;

  rx_fifo = uword_to_pointer (mp->server_rx_fifo, svm_fifo_t *);
  rx_fifo->client_session_index = session_index;
  tx_fifo = uword_to_pointer (mp->server_tx_fifo, svm_fifo_t *);
  tx_fifo->client_session_index = session_index;

  session->rx_fifo = rx_fifo;
  session->tx_fifo = tx_fifo;
  session->vpp_session_handle = mp->handle;
  session->start = clib_time_now (&em->clib_time);
  session->vpp_evt_q = uword_to_pointer (mp->vpp_event_queue_address,
					 svm_msg_q_t *);

  hash_set (em->session_index_by_vpp_handles, mp->handle, session_index);

  /*
   * Start RX thread
   */
  em->thread_args[em->n_clients_connected] = session_index;
  rv = pthread_create (&em->client_thread_handles[em->n_clients_connected],
		       NULL /*attr */ , client_thread_fn,
		       (void *) &em->thread_args[em->n_clients_connected]);
  if (rv)
    {
      clib_warning ("pthread_create returned %d", rv);
      return;
    }

  em->n_clients_connected += 1;
  clib_warning ("session %u (0x%llx) connected with local ip %U port %d",
		session_index, mp->handle, format_ip46_address, &mp->lcl.ip,
		mp->lcl.is_ip4, clib_net_to_host_u16 (mp->lcl.port));
}

static void
session_disconnected_handler (session_disconnected_msg_t * mp)
{
  app_session_evt_t _app_evt, *app_evt = &_app_evt;
  session_disconnected_reply_msg_t *rmp;
  echo_main_t *em = &echo_main;
  echo_session_t *session = 0;
  uword *p;
  int rv = 0;

  p = hash_get (em->session_index_by_vpp_handles, mp->handle);
  if (!p)
    {
      clib_warning ("couldn't find session key %llx", mp->handle);
      return;
    }

  session = pool_elt_at_index (em->sessions, p[0]);
  hash_unset (em->session_index_by_vpp_handles, mp->handle);
  pool_put (em->sessions, session);

  app_alloc_ctrl_evt_to_vpp (session->vpp_evt_q, app_evt,
			     SESSION_CTRL_EVT_DISCONNECTED_REPLY);
  rmp = (session_disconnected_reply_msg_t *) app_evt->evt->data;
  rmp->retval = rv;
  rmp->handle = mp->handle;
  rmp->context = mp->context;
  app_send_ctrl_evt_to_vpp (session->vpp_evt_q, app_evt);

  session_print_stats (em, session);
}

static void
session_reset_handler (session_reset_msg_t * mp)
{
  app_session_evt_t _app_evt, *app_evt = &_app_evt;
  echo_main_t *em = &echo_main;
  session_reset_reply_msg_t *rmp;
  echo_session_t *session = 0;
  uword *p;
  int rv = 0;

  p = hash_get (em->session_index_by_vpp_handles, mp->handle);

  if (p)
    {
      session = pool_elt_at_index (em->sessions, p[0]);
      clib_warning ("got reset");
      /* Cleanup later */
      em->time_to_stop = 1;
    }
  else
    {
      clib_warning ("couldn't find session key %llx", mp->handle);
      return;
    }

  app_alloc_ctrl_evt_to_vpp (session->vpp_evt_q, app_evt,
			     SESSION_CTRL_EVT_RESET_REPLY);
  rmp = (session_reset_reply_msg_t *) app_evt->evt->data;
  rmp->retval = rv;
  rmp->handle = mp->handle;
  app_send_ctrl_evt_to_vpp (session->vpp_evt_q, app_evt);
}

static void
handle_mq_event (session_event_t * e)
{
  switch (e->event_type)
    {
    case SESSION_CTRL_EVT_BOUND:
      session_bound_handler ((session_bound_msg_t *) e->data);
      break;
    case SESSION_CTRL_EVT_ACCEPTED:
      session_accepted_handler ((session_accepted_msg_t *) e->data);
      break;
    case SESSION_CTRL_EVT_CONNECTED:
      session_connected_handler ((session_connected_msg_t *) e->data);
      break;
    case SESSION_CTRL_EVT_DISCONNECTED:
      session_disconnected_handler ((session_disconnected_msg_t *) e->data);
      break;
    case SESSION_CTRL_EVT_RESET:
      session_reset_handler ((session_reset_msg_t *) e->data);
      break;
    default:
      clib_warning ("unhandled %u", e->event_type);
    }
}

static void
clients_run (echo_main_t * em)
{
  f64 start_time, deltat, timeout = 100.0;
  svm_msg_q_msg_t msg;
  session_event_t *e;
  echo_session_t *s;
  int i;

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

  /*
   * Attach and connect the clients
   */
  if (application_attach (em))
    return;

  for (i = 0; i < em->n_clients; i++)
    client_send_connect (em);

  start_time = clib_time_now (&em->clib_time);
  while (em->n_clients_connected < em->n_clients
	 && (clib_time_now (&em->clib_time) - start_time < timeout)
	 && em->state != STATE_FAILED && em->time_to_stop != 1)

    {
      int rc = svm_msg_q_sub (em->our_event_queue, &msg, SVM_Q_TIMEDWAIT, 1);
      if (rc == ETIMEDOUT && em->time_to_stop)
	break;
      if (rc == ETIMEDOUT)
	continue;
      e = svm_msg_q_msg_data (em->our_event_queue, &msg);
      handle_mq_event (e);
      svm_msg_q_free_msg (em->our_event_queue, &msg);
    }

  if (em->n_clients_connected != em->n_clients)
    {
      clib_warning ("failed to initialize all connections");
      return;
    }

  /*
   * Initialize connections
   */
  for (i = 0; i < em->n_clients; i++)
    {
      s = pool_elt_at_index (em->sessions, i);
      s->bytes_to_send = em->bytes_to_send;
      if (!em->no_return)
	s->bytes_to_receive = em->bytes_to_send;
    }
  em->n_active_clients = em->n_clients_connected;

  /*
   * Wait for client threads to send the data
   */
  start_time = clib_time_now (&em->clib_time);
  em->state = STATE_READY;
  while (em->n_active_clients)
    if (!svm_msg_q_is_empty (em->our_event_queue))
      {
	if (svm_msg_q_sub (em->our_event_queue, &msg, SVM_Q_TIMEDWAIT, 0))
	  {
	    clib_warning ("svm msg q returned");
	    continue;
	  }
	e = svm_msg_q_msg_data (em->our_event_queue, &msg);
	if (e->event_type != FIFO_EVENT_APP_RX)
	  handle_mq_event (e);
	svm_msg_q_free_msg (em->our_event_queue, &msg);
      }

  for (i = 0; i < em->n_clients; i++)
    {
      s = pool_elt_at_index (em->sessions, i);
      client_disconnect (em, s);
    }

  /*
   * Stats and detach
   */
  deltat = clib_time_now (&em->clib_time) - start_time;
  fformat (stdout, "%lld bytes (%lld mbytes, %lld gbytes) in %.2f seconds\n",
	   em->tx_total, em->tx_total / (1ULL << 20),
	   em->tx_total / (1ULL << 30), deltat);
  fformat (stdout, "%.4f Gbit/second\n", (em->tx_total * 8.0) / deltat / 1e9);

  application_detach (em);
}

static void
vl_api_bind_uri_reply_t_handler (vl_api_bind_uri_reply_t * mp)
{
  echo_main_t *em = &echo_main;

  if (mp->retval)
    {
      clib_warning ("bind failed: %U", format_api_error,
		    clib_net_to_host_u32 (mp->retval));
      em->state = STATE_FAILED;
      return;
    }

  em->state = STATE_READY;
}

static void
vl_api_unbind_uri_reply_t_handler (vl_api_unbind_uri_reply_t * mp)
{
  echo_main_t *em = &echo_main;

  if (mp->retval != 0)
    clib_warning ("returned %d", ntohl (mp->retval));

  em->state = STATE_START;
}

u8 *
format_ip4_address (u8 * s, va_list * args)
{
  u8 *a = va_arg (*args, u8 *);
  return format (s, "%d.%d.%d.%d", a[0], a[1], a[2], a[3]);
}

u8 *
format_ip6_address (u8 * s, va_list * args)
{
  ip6_address_t *a = va_arg (*args, ip6_address_t *);
  u32 i, i_max_n_zero, max_n_zeros, i_first_zero, n_zeros, last_double_colon;

  i_max_n_zero = ARRAY_LEN (a->as_u16);
  max_n_zeros = 0;
  i_first_zero = i_max_n_zero;
  n_zeros = 0;
  for (i = 0; i < ARRAY_LEN (a->as_u16); i++)
    {
      u32 is_zero = a->as_u16[i] == 0;
      if (is_zero && i_first_zero >= ARRAY_LEN (a->as_u16))
	{
	  i_first_zero = i;
	  n_zeros = 0;
	}
      n_zeros += is_zero;
      if ((!is_zero && n_zeros > max_n_zeros)
	  || (i + 1 >= ARRAY_LEN (a->as_u16) && n_zeros > max_n_zeros))
	{
	  i_max_n_zero = i_first_zero;
	  max_n_zeros = n_zeros;
	  i_first_zero = ARRAY_LEN (a->as_u16);
	  n_zeros = 0;
	}
    }

  last_double_colon = 0;
  for (i = 0; i < ARRAY_LEN (a->as_u16); i++)
    {
      if (i == i_max_n_zero && max_n_zeros > 1)
	{
	  s = format (s, "::");
	  i += max_n_zeros - 1;
	  last_double_colon = 1;
	}
      else
	{
	  s = format (s, "%s%x",
		      (last_double_colon || i == 0) ? "" : ":",
		      clib_net_to_host_u16 (a->as_u16[i]));
	  last_double_colon = 0;
	}
    }

  return s;
}

/* Format an IP46 address. */
u8 *
format_ip46_address (u8 * s, va_list * args)
{
  ip46_address_t *ip46 = va_arg (*args, ip46_address_t *);
  ip46_type_t type = va_arg (*args, ip46_type_t);
  int is_ip4 = 1;

  switch (type)
    {
    case IP46_TYPE_ANY:
      is_ip4 = ip46_address_is_ip4 (ip46);
      break;
    case IP46_TYPE_IP4:
      is_ip4 = 1;
      break;
    case IP46_TYPE_IP6:
      is_ip4 = 0;
      break;
    }

  return is_ip4 ?
    format (s, "%U", format_ip4_address, &ip46->ip4) :
    format (s, "%U", format_ip6_address, &ip46->ip6);
}

static void
server_handle_rx (echo_main_t * em, session_event_t * e)
{
  int n_read, max_dequeue, n_sent;
  u32 offset, to_dequeue;
  echo_session_t *s;

  s = pool_elt_at_index (em->sessions, e->session_index);

  /* Clear event only once. Otherwise, if we do it in the loop by calling
   * app_recv_stream, we may end up with a lot of unhandled rx events on the
   * message queue */
  svm_fifo_unset_event (s->rx_fifo);

  max_dequeue = svm_fifo_max_dequeue (s->rx_fifo);
  if (PREDICT_FALSE (!max_dequeue))
    return;

  do
    {
      /* The options here are to limit ourselves to max_dequeue or read
       * even the data that was enqueued while we were dequeueing and which
       * now has an rx event in the mq. Either of the two work. */
      to_dequeue = clib_min (max_dequeue, vec_len (em->rx_buf));
      n_read = app_recv_stream_raw (s->rx_fifo, em->rx_buf, to_dequeue,
				    0 /* clear evt */ , 0 /* peek */ );
      if (n_read > 0)
	{
	  max_dequeue -= n_read;
	  s->bytes_received += n_read;
	}
      else
	break;

      /* Reflect if a non-drop session */
      if (!em->no_return && n_read > 0)
	{
	  offset = 0;
	  do
	    {
	      n_sent = app_send_stream ((app_session_t *) s,
					&em->rx_buf[offset],
					n_read, SVM_Q_WAIT);
	      if (n_sent > 0)
		{
		  n_read -= n_sent;
		  offset += n_sent;
		}
	    }
	  while ((n_sent <= 0 || n_read > 0) && !em->time_to_stop);
	}
    }
  while (max_dequeue > 0 && !em->time_to_stop);
}

static void
server_handle_mq (echo_main_t * em)
{
  svm_msg_q_msg_t msg;
  session_event_t *e;

  while (1)
    {
      int rc = svm_msg_q_sub (em->our_event_queue, &msg, SVM_Q_TIMEDWAIT, 1);
      if (PREDICT_FALSE (rc == ETIMEDOUT && em->time_to_stop))
	break;
      if (PREDICT_FALSE (em->time_to_print_stats == 1))
	{
	  em->time_to_print_stats = 0;
	  fformat (stdout, "%d connections\n", pool_elts (em->sessions));
	}
      if (rc == ETIMEDOUT)
	continue;
      e = svm_msg_q_msg_data (em->our_event_queue, &msg);
      clib_warning ("Event %d", e->event_type);
      switch (e->event_type)
	{
	case FIFO_EVENT_APP_RX:
	  server_handle_rx (em, e);
	  break;
	default:
	  handle_mq_event (e);
	  break;
	}
      svm_msg_q_free_msg (em->our_event_queue, &msg);
    }
}

void
server_send_listen (echo_main_t * em)
{
  vl_api_bind_uri_t *bmp;
  bmp = vl_msg_api_alloc (sizeof (*bmp));
  clib_memset (bmp, 0, sizeof (*bmp));

  bmp->_vl_msg_id = ntohs (VL_API_BIND_URI);
  bmp->client_index = em->my_client_index;
  bmp->context = ntohl (0xfeedface);
  memcpy (bmp->uri, em->uri, vec_len (em->uri));
  vl_msg_api_send_shmem (em->vl_input_queue, (u8 *) & bmp);
}

int
server_listen (echo_main_t * em)
{
  server_send_listen (em);
  if (wait_for_state_change (em, STATE_READY))
    {
      clib_warning ("timeout waiting for STATE_READY");
      return -1;
    }
  return 0;
}

void
server_send_unbind (echo_main_t * em)
{
  vl_api_unbind_uri_t *ump;

  ump = vl_msg_api_alloc (sizeof (*ump));
  clib_memset (ump, 0, sizeof (*ump));

  ump->_vl_msg_id = ntohs (VL_API_UNBIND_URI);
  ump->client_index = em->my_client_index;
  memcpy (ump->uri, em->uri, vec_len (em->uri));
  vl_msg_api_send_shmem (em->vl_input_queue, (u8 *) & ump);
}

void
server_run (echo_main_t * em)
{
  echo_session_t *session;
  int i;

  /* $$$$ hack preallocation */
  for (i = 0; i < 200000; i++)
    {
      pool_get (em->sessions, session);
      clib_memset (session, 0, sizeof (*session));
    }
  for (i = 0; i < 200000; i++)
    pool_put_index (em->sessions, i);

  if (application_attach (em))
    return;

  /* Bind to uri */
  if (server_listen (em))
    return;

  /* Enter handle event loop */
  server_handle_mq (em);

  /* Cleanup */
  server_send_unbind (em);

  application_detach (em);

  fformat (stdout, "Test complete...\n");
}

static void
vl_api_disconnect_session_reply_t_handler (vl_api_disconnect_session_reply_t *
					   mp)
{
  echo_main_t *em = &echo_main;
  uword *p;

  if (mp->retval)
    {
      clib_warning ("vpp complained about disconnect: %d",
		    ntohl (mp->retval));
      return;
    }

  em->state = STATE_START;

  p = hash_get (em->session_index_by_vpp_handles, mp->handle);
  if (p)
    {
      hash_unset (em->session_index_by_vpp_handles, mp->handle);
    }
  else
    {
      clib_warning ("couldn't find session key %llx", mp->handle);
    }
}

static void
  vl_api_application_tls_cert_add_reply_t_handler
  (vl_api_application_tls_cert_add_reply_t * mp)
{
  if (mp->retval)
    clib_warning ("failed to add tls cert");
}

static void
  vl_api_application_tls_key_add_reply_t_handler
  (vl_api_application_tls_key_add_reply_t * mp)
{
  if (mp->retval)
    clib_warning ("failed to add tls key");
}

#define foreach_quic_echo_msg                            		\
_(BIND_URI_REPLY, bind_uri_reply)                       		\
_(UNBIND_URI_REPLY, unbind_uri_reply)                   		\
_(DISCONNECT_SESSION_REPLY, disconnect_session_reply)   		\
_(APPLICATION_ATTACH_REPLY, application_attach_reply)   		\
_(APPLICATION_DETACH_REPLY, application_detach_reply)			\
_(MAP_ANOTHER_SEGMENT, map_another_segment)				\
_(APPLICATION_TLS_CERT_ADD_REPLY, application_tls_cert_add_reply)	\
_(APPLICATION_TLS_KEY_ADD_REPLY, application_tls_key_add_reply)		\

void
quic_echo_api_hookup (echo_main_t * em)
{
#define _(N,n)                                                  \
    vl_msg_api_set_handlers(VL_API_##N, #n,                     \
                           vl_api_##n##_t_handler,              \
                           vl_noop_handler,                     \
                           vl_api_##n##_t_endian,               \
                           vl_api_##n##_t_print,                \
                           sizeof(vl_api_##n##_t), 1);
  foreach_quic_echo_msg;
#undef _
}

int
main (int argc, char **argv)
{
  int i_am_server = 1, test_return_packets = 0;
  echo_main_t *em = &echo_main;
  fifo_segment_main_t *sm = &em->segment_main;
  unformat_input_t _argv, *a = &_argv;
  u8 *chroot_prefix;
  u8 *uri = 0;
  u8 *bind_uri = (u8 *) "quic://0.0.0.0/1234";
  u8 *connect_uri = (u8 *) "quic://6.0.1.1/1234";
  u64 bytes_to_send = 64 << 10, mbytes;
  char *app_name;
  u32 tmp;

  clib_mem_init_thread_safe (0, 256 << 20);

  clib_memset (em, 0, sizeof (*em));
  em->session_index_by_vpp_handles = hash_create (0, sizeof (uword));
  em->my_pid = getpid ();
  em->configured_segment_size = 1 << 20;
  em->socket_name = 0;
  em->use_sock_api = 1;
  em->fifo_size = 64 << 10;
  em->n_clients = 1;

  clib_time_init (&em->clib_time);
  init_error_string_table (em);
  fifo_segment_main_init (sm, HIGH_SEGMENT_BASEVA, 20);
  unformat_init_command_line (a, argv);

  while (unformat_check_input (a) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (a, "chroot prefix %s", &chroot_prefix))
	{
	  vl_set_memory_root_path ((char *) chroot_prefix);
	}
      else if (unformat (a, "uri %s", &uri))
	;
      else if (unformat (a, "segment-size %dM", &tmp))
	em->configured_segment_size = tmp << 20;
      else if (unformat (a, "segment-size %dG", &tmp))
	em->configured_segment_size = tmp << 30;
      else if (unformat (a, "server"))
	i_am_server = 1;
      else if (unformat (a, "client"))
	i_am_server = 0;
      else if (unformat (a, "no-return"))
	em->no_return = 1;
      else if (unformat (a, "test"))
	test_return_packets = 1;
      else if (unformat (a, "bytes %lld", &mbytes))
	{
	  bytes_to_send = mbytes;
	}
      else if (unformat (a, "mbytes %lld", &mbytes))
	{
	  bytes_to_send = mbytes << 20;
	}
      else if (unformat (a, "gbytes %lld", &mbytes))
	{
	  bytes_to_send = mbytes << 30;
	}
      else if (unformat (a, "socket-name %s", &em->socket_name))
	;
      else if (unformat (a, "use-svm-api"))
	em->use_sock_api = 0;
      else if (unformat (a, "fifo-size %d", &tmp))
	em->fifo_size = tmp << 10;
      else if (unformat (a, "nclients %d", &em->n_clients))
	;
      else
	{
	  fformat (stderr, "%s: usage [master|slave]\n", argv[0]);
	  exit (1);
	}
    }

  if (!em->socket_name)
    em->socket_name = format (0, "%s%c", API_SOCKET_FILE, 0);

  if (uri)
    {
      em->uri = format (0, "%s%c", uri, 0);
      em->connect_uri = format (0, "%s%c", uri, 0);
    }
  else
    {
      em->uri = format (0, "%s%c", bind_uri, 0);
      em->connect_uri = format (0, "%s%c", connect_uri, 0);
    }

  em->i_am_master = i_am_server;
  em->test_return_packets = test_return_packets;
  em->bytes_to_send = bytes_to_send;
  em->time_to_stop = 0;
  vec_validate (em->rx_buf, 4 << 20);
  vec_validate (em->client_thread_handles, em->n_clients - 1);
  vec_validate (em->thread_args, em->n_clients - 1);

  setup_signal_handlers ();
  quic_echo_api_hookup (em);

  app_name = i_am_server ? "quic_echo_server" : "quic_echo_client";
  if (connect_to_vpp (app_name) < 0)
    {
      svm_region_exit ();
      fformat (stderr, "Couldn't connect to vpe, exiting...\n");
      exit (1);
    }

  if (i_am_server == 0)
    clients_run (em);
  else
    server_run (em);

  /* Make sure detach finishes */
  wait_for_state_change (em, STATE_DETACHED);

  disconnect_from_vpp (em);
  exit (0);
}

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