src/plugins/hs_apps/vcl/vcl_test_server.c


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# 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.

*** Settings ***
| Resource | resources/libraries/robot/shared/default.robot
| ...
| Force Tags | 2_NODE_SINGLE_LINK_TOPO | DEVICETEST | HW_ENV | DCR_ENV | SCAPY
| ... | NIC_Virtual | ETH | L2XCFWD | BASE | ICMP | DRV_VFIO_PCI
| ...
| Suite Setup | Setup suite single link | scapy
| Test Setup | Setup test
| Test Teardown | Tear down test | packet_trace
| ...
| Test Template | Local Template
| ...
| Documentation | *L2 cross-connect test cases*
| ...
| ... | *[Top] Network Topologies:* TG-DUT1-TG 2-node circular topology \
| ... | with single links between nodes.
| ... | *[Enc] Packet Encapsulations:* Eth-IPv4-ICMPv4 for L2 switching of \
| ... | IPv4. Both apply to all links.
| ... | *[Cfg] DUT configuration:* DUT1 is configured with L2 cross-connect \
| ... | switching.
| ... | *[Ver] TG verification:* Test ICMPv4 Echo Request packets \
| ... | are sent in both directions by TG on links to DUT1; on receive TG \
| ... | verifies packets for correctness and their IPv4 src-addr, \
| ... | dst-addr and MAC addresses.
| ... | *[Ref] Applicable standard specifications:* RFC792

*** Variables ***
| @{plugins_to_enable}= | dpdk_plugin.so
| ${crypto_type}= | ${None}
| ${nic_name}= | virtual
| ${nic_driver}= | vfio-pci
| ${overhead}= | ${0}

*** Keywords ***
| Local Template
| | [Documentation]
| | ... | [Ver] Make TG send ICMPv4 Echo Reqs in both directions between two\
| | ... | of its interfaces to be switched by DUT to and from docker; verify\
| | ... | all packets are received.
| | ...
| | ... | *Arguments:*
| | ... | - frame_size - Framesize in Bytes in integer. Type: integer
| | ... | - phy_cores - Number of physical cores. Type: integer
| | ... | - rxq - Number of RX queues, default value: ${None}. Type: integer
| | ...
| | [Arguments] | ${frame_size} | ${phy_cores} | ${rxq}=${None}
| | ...
| | Set Test Variable | \${frame_size}
| | ...
| | Given Set Max Rate And Jumbo
| | And Add worker threads to all DUTs | ${phy_cores} | ${rxq}
| | And Pre-initialize layer driver | ${nic_driver}
| | And Apply startup configuration on all VPP DUTs | with_trace=${True}
| | When Initialize layer driver | ${nic_driver}
| | And Initialize layer interface
| | And Initialize L2 xconnect in 2-node circular topology
| | Then Send ICMPv4 bidirectionally and verify received packets
| | ... | ${tg} | ${tg_if1} | ${tg_if2}

*** Test Cases ***
| tc01-64B-ethicmpv4-l2xcbase-dev
| | [Tags] | 64B
| | frame_size=${64} | phy_cores=${0}
/*
 * Copyright (c) 2017-2021 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 <unistd.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <ctype.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <hs_apps/vcl/vcl_test.h>
#include <sys/epoll.h>
#include <vppinfra/mem.h>
#include <pthread.h>

typedef struct
{
  uint16_t port;
  uint32_t address_ip6;
  u8 proto;
  u8 workers;
  vppcom_endpt_t endpt;
} vcl_test_server_cfg_t;

typedef struct
{
  vcl_test_session_t *conn_pool;
  uint32_t wrk_index;
  int epfd;
  int conn_pool_size;
  int nfds;
  vcl_test_session_t listener;
  pthread_t thread_handle;
} vcl_test_server_worker_t;

typedef struct
{
  vcl_test_server_worker_t *workers;
  vcl_test_session_t *ctrl;
  vcl_test_server_cfg_t server_cfg;
  int ctrl_listen_fd;
  struct sockaddr_storage servaddr;
  volatile int worker_fails;
  volatile int active_workers;
  u8 use_ds;
  u8 incremental_stats;
} vcl_test_server_main_t;

vcl_test_main_t vcl_test_main;

static vcl_test_server_main_t vcl_server_main;

static inline void
conn_pool_expand (vcl_test_server_worker_t * wrk, size_t expand_size)
{
  vcl_test_session_t *conn_pool;
  size_t new_size = wrk->conn_pool_size + expand_size;
  int i;

  conn_pool = realloc (wrk->conn_pool, new_size * sizeof (*wrk->conn_pool));
  if (conn_pool)
    {
      for (i = wrk->conn_pool_size; i < new_size; i++)
	{
	  vcl_test_session_t *conn = &conn_pool[i];
	  memset (conn, 0, sizeof (*conn));
	}

      wrk->conn_pool = conn_pool;
      wrk->conn_pool_size = new_size;
    }
  else
    {
      vterr ("conn_pool_expand()", -errno);
    }
}

static inline vcl_test_session_t *
conn_pool_alloc (vcl_test_server_worker_t *wrk)
{
  vcl_test_session_t *conn;
  int i, expand = 0;

again:
  for (i = 0; i < wrk->conn_pool_size; i++)
    {
      if (!wrk->conn_pool[i].is_alloc)
	{
	  conn = &wrk->conn_pool[i];
	  memset (conn, 0, sizeof (*conn));
	  conn->endpt.ip = wrk->conn_pool[i].ip;
	  conn->is_alloc = 1;
	  conn->session_index = i;
	  vcl_test_cfg_init (&conn->cfg);
	  return (&wrk->conn_pool[i]);
	}
    }

  if (expand == 0)
    {
      conn_pool_expand (wrk, 2 * wrk->conn_pool_size);
      expand = 1;
      goto again;
    }
  vtwrn ("Failed to allocate connection even after expand");
  return 0;
}

static inline void
conn_pool_free (vcl_test_session_t *ts)
{
  ts->fd = 0;
  ts->is_alloc = 0;
  vcl_test_session_buf_free (ts);
}

static inline void
sync_config_and_reply (vcl_test_session_t *conn, vcl_test_cfg_t *rx_cfg)
{
  conn->cfg = *rx_cfg;
  vcl_test_buf_alloc (&conn->cfg, 1 /* is_rxbuf */, (uint8_t **) &conn->rxbuf,
		      &conn->rxbuf_size);
  conn->cfg.txbuf_size = conn->cfg.rxbuf_size;

  if (conn->cfg.verbose)
    {
      vtinf ("(fd %d): Replying to cfg message!\n", conn->fd);
      vcl_test_cfg_dump (&conn->cfg, 0 /* is_client */ );
    }
  (void) vcl_test_write (conn, &conn->cfg, sizeof (conn->cfg));
}

static void
vts_session_close (vcl_test_session_t *conn)
{
  vcl_test_server_main_t *vsm = &vcl_server_main;
  vcl_test_main_t *vt = &vcl_test_main;

  if (!conn->is_open)
    return;

  if (vt->protos[vsm->server_cfg.proto]->close)
    vt->protos[vsm->server_cfg.proto]->close (conn);

  vppcom_session_close (conn->fd);
  conn->is_open = 0;
}

static void
vts_session_cleanup (vcl_test_session_t *ts)
{
  vts_session_close (ts);
  conn_pool_free (ts);
}

static void
vts_wrk_cleanup_all (vcl_test_server_worker_t *wrk)
{
  vcl_test_session_t *conn;
  int i;

  for (i = 0; i < wrk->conn_pool_size; i++)
    {
      conn = &wrk->conn_pool[i];
      vts_session_cleanup (conn);
    }

  wrk->nfds = 0;
}

static void
vts_test_cmd (vcl_test_server_worker_t *wrk, vcl_test_session_t *conn,
	      vcl_test_cfg_t *rx_cfg)
{
  u8 is_bi = rx_cfg->test == VCL_TEST_TYPE_BI;
  vcl_test_session_t *tc;
  char buf[64];
  int i;

  if (rx_cfg->cmd == VCL_TEST_CMD_STOP)
    {
      struct timespec stop;
      clock_gettime (CLOCK_REALTIME, &stop);

      /* Test session are not closed, e.g., connection-less or errors */
      if (wrk->nfds > 1)
	{
	  vtinf ("%u sessions are still open", wrk->nfds - 1);
	  stop.tv_sec -= VCL_TEST_DELAY_DISCONNECT;
	  conn->stats.stop = stop;
	}

      /* Accumulate stats over all of the worker's sessions */
      for (i = 0; i < wrk->conn_pool_size; i++)
	{
	  tc = &wrk->conn_pool[i];
	  if (tc == conn)
	    continue;

	  vcl_test_stats_accumulate (&conn->stats, &tc->stats);
	  if (tc->is_open)
	    {
	      vts_session_cleanup (tc);
	      continue;
	    }
	  /* Only relevant if all connections previously closed */
	  if (vcl_comp_tspec (&conn->stats.stop, &tc->stats.stop) < 0)
	    conn->stats.stop = tc->stats.stop;
	}

      if (conn->cfg.verbose)
	{
	  snprintf (buf, sizeof (buf), "SERVER (fd %d) RESULTS", conn->fd);
	  vcl_test_stats_dump (buf, &conn->stats, 1 /* show_rx */,
			       is_bi /* show tx */, conn->cfg.verbose);
	}

      vcl_test_stats_dump ("SERVER RESULTS", &conn->stats, 1 /* show_rx */ ,
			   is_bi /* show_tx */ , conn->cfg.verbose);
      vcl_test_cfg_dump (&conn->cfg, 0 /* is_client */ );
      if (conn->cfg.verbose)
	{
	  vtinf ("  vcl server main\n" VCL_TEST_SEPARATOR_STRING
		 "       buf:  %p\n"
		 "  buf size:  %u (0x%08x)\n" VCL_TEST_SEPARATOR_STRING,
		 conn->rxbuf, conn->rxbuf_size, conn->rxbuf_size);
	}

      sync_config_and_reply (conn, rx_cfg);
      memset (&conn->stats, 0, sizeof (conn->stats));
    }
  else if (rx_cfg->cmd == VCL_TEST_CMD_SYNC)
    {
      rx_cfg->ctrl_handle = conn->fd;
      vtinf ("Set control fd %d for test!", conn->fd);
      sync_config_and_reply (conn, rx_cfg);
    }
  else if (rx_cfg->cmd == VCL_TEST_CMD_START)
    {
      vtinf ("Starting %s-directional Stream Test (fd %d)!",
	     is_bi ? "Bi" : "Uni", conn->fd);
      rx_cfg->ctrl_handle = conn->fd;
      sync_config_and_reply (conn, rx_cfg);

      /* read the 1st chunk, record start time */
      memset (&conn->stats, 0, sizeof (conn->stats));
      clock_gettime (CLOCK_REALTIME, &conn->stats.start);
    }
}

static inline void
vts_server_process_rx (vcl_test_session_t *conn, int rx_bytes)
{
  vcl_test_server_main_t *vsm = &vcl_server_main;

  if (conn->cfg.test == VCL_TEST_TYPE_BI)
    {
      if (vsm->use_ds)
	{
	  (void) vcl_test_write (conn, conn->ds[0].data, conn->ds[0].len);
	  if (conn->ds[1].len)
	    (void) vcl_test_write (conn, conn->ds[1].data, conn->ds[1].len);
	}
      else
	(void) vcl_test_write (conn, conn->rxbuf, rx_bytes);
    }

  if (vsm->use_ds)
    vppcom_session_free_segments (conn->fd, rx_bytes);

  if (conn->stats.rx_bytes >= conn->cfg.total_bytes)
    clock_gettime (CLOCK_REALTIME, &conn->stats.stop);
}

static void
vts_server_echo (vcl_test_session_t *conn, int rx_bytes)
{
  int tx_bytes, nbytes, pos;

  /* If it looks vaguely like a string, make sure it's terminated */
  pos = rx_bytes < conn->rxbuf_size ? rx_bytes : conn->rxbuf_size - 1;
  ((char *) conn->rxbuf)[pos] = 0;
  vtinf ("(fd %d): RX (%d bytes) - '%s'", conn->fd, rx_bytes, conn->rxbuf);

  if (conn->cfg.verbose)
    vtinf ("(fd %d): Echoing back", conn->fd);

  nbytes = strlen ((const char *) conn->rxbuf) + 1;
  tx_bytes = conn->write (conn, conn->rxbuf, nbytes);
  if (tx_bytes >= 0)
    vtinf ("(fd %d): TX (%d bytes) - '%s'", conn->fd, tx_bytes, conn->rxbuf);
}

static vcl_test_session_t *
vts_accept_ctrl (vcl_test_server_worker_t *wrk, int listen_fd)
{
  vcl_test_server_main_t *vsm = &vcl_server_main;
  const vcl_test_proto_vft_t *tp;
  vcl_test_session_t *conn;
  struct epoll_event ev;
  int rv;

  conn = conn_pool_alloc (wrk);
  if (!conn)
    {
      vtwrn ("No free connections!");
      return 0;
    }

  if (vsm->ctrl)
    conn->cfg = vsm->ctrl->cfg;
  vcl_test_session_buf_alloc (conn);
  clock_gettime (CLOCK_REALTIME, &conn->old_stats.stop);

  tp = vcl_test_main.protos[VPPCOM_PROTO_TCP];
  if (tp->accept (listen_fd, conn))
    return 0;

  vtinf ("CTRL accepted fd = %d (0x%08x) on listener fd = %d (0x%08x)",
	 conn->fd, conn->fd, listen_fd, listen_fd);

  ev.events = EPOLLET | EPOLLIN;
  ev.data.u64 = conn - wrk->conn_pool;
  rv = vppcom_epoll_ctl (wrk->epfd, EPOLL_CTL_ADD, conn->fd, &ev);
  if (rv < 0)
    {
      vterr ("vppcom_epoll_ctl()", rv);
      return 0;
    }

  wrk->nfds++;

  return conn;
}

static vcl_test_session_t *
vts_accept_client (vcl_test_server_worker_t *wrk, int listen_fd)
{
  vcl_test_server_main_t *vsm = &vcl_server_main;
  const vcl_test_proto_vft_t *tp;
  vcl_test_session_t *conn;
  struct epoll_event ev;
  int rv;

  conn = conn_pool_alloc (wrk);
  if (!conn)
    {
      vtwrn ("No free connections!");
      return 0;
    }

  if (vsm->ctrl)
    conn->cfg = vsm->ctrl->cfg;
  vcl_test_session_buf_alloc (conn);
  clock_gettime (CLOCK_REALTIME, &conn->old_stats.stop);

  tp = vcl_test_main.protos[vsm->server_cfg.proto];
  if (tp->accept (listen_fd, conn))
    return 0;

  vtinf ("Got a connection -- fd = %d (0x%08x) on listener fd = %d (0x%08x)",
	 conn->fd, conn->fd, listen_fd, listen_fd);

  ev.events = EPOLLET | EPOLLIN;
  ev.data.u64 = conn - wrk->conn_pool;
  rv = vppcom_epoll_ctl (wrk->epfd, EPOLL_CTL_ADD, conn->fd, &ev);
  if (rv < 0)
    {
      vterr ("vppcom_epoll_ctl()", rv);
      return 0;
    }
  wrk->nfds++;

  return conn;
}

static void
print_usage_and_exit (void)
{
  fprintf (stderr, "vcl_test_server [OPTIONS] <port>\n"
		   "  OPTIONS\n"
		   "  -h               Print this message and exit.\n"
		   "  -6               Use IPv6\n"
		   "  -w <num>         Number of workers\n"
		   "  -p <PROTO>       Use <PROTO> transport layer\n"
		   "  -D               Use UDP transport layer\n"
		   "  -L               Use TLS transport layer\n"
		   "  -S	       Incremental stats\n");
  exit (1);
}

static void
vcl_test_init_endpoint_addr (vcl_test_server_main_t * vsm)
{
  struct sockaddr_storage *servaddr = &vsm->servaddr;
  memset (servaddr, 0, sizeof (*servaddr));

  if (vsm->server_cfg.address_ip6)
    {
      struct sockaddr_in6 *server_addr = (struct sockaddr_in6 *) servaddr;
      server_addr->sin6_family = AF_INET6;
      server_addr->sin6_addr = in6addr_any;
      server_addr->sin6_port = htons (vsm->server_cfg.port);
    }
  else
    {
      struct sockaddr_in *server_addr = (struct sockaddr_in *) servaddr;
      server_addr->sin_family = AF_INET;
      server_addr->sin_addr.s_addr = htonl (INADDR_ANY);
      server_addr->sin_port = htons (vsm->server_cfg.port);
    }

  if (vsm->server_cfg.address_ip6)
    {
      struct sockaddr_in6 *server_addr = (struct sockaddr_in6 *) servaddr;
      vsm->server_cfg.endpt.is_ip4 = 0;
      vsm->server_cfg.endpt.ip = (uint8_t *) &server_addr->sin6_addr;
      vsm->server_cfg.endpt.port = (uint16_t) server_addr->sin6_port;
    }
  else
    {
      struct sockaddr_in *server_addr = (struct sockaddr_in *) servaddr;
      vsm->server_cfg.endpt.is_ip4 = 1;
      vsm->server_cfg.endpt.ip = (uint8_t *) &server_addr->sin_addr;
      vsm->server_cfg.endpt.port = (uint16_t) server_addr->sin_port;
    }
}

static void
vcl_test_server_process_opts (vcl_test_server_main_t * vsm, int argc,
			      char **argv)
{
  int v, c;

  vsm->server_cfg.proto = VPPCOM_PROTO_TCP;

  opterr = 0;
  while ((c = getopt (argc, argv, "6DLsw:hp:S")) != -1)
    switch (c)
      {
      case '6':
	vsm->server_cfg.address_ip6 = 1;
	break;

      case 'p':
	if (vppcom_unformat_proto (&vsm->server_cfg.proto, optarg))
	  vtwrn ("Invalid vppcom protocol %s, defaulting to TCP", optarg);
	break;

      case 'D':
	vsm->server_cfg.proto = VPPCOM_PROTO_UDP;
	break;

      case 'L':
	vsm->server_cfg.proto = VPPCOM_PROTO_TLS;
	break;

      case 'w':
	v = atoi (optarg);
	if (v > 1)
	  vsm->server_cfg.workers = v;
	else
	  vtwrn ("Invalid number of workers %d", v);
	break;
      case 's':
	vsm->use_ds = 1;
	break;
      case 'S':
	vsm->incremental_stats = 1;
	break;
      case '?':
	switch (optopt)
	  {
	  case 'w':
	  case 'p':
	    vtwrn ("Option `-%c' requires an argument.", optopt);
	    break;
	  default:
	    if (isprint (optopt))
	      vtwrn ("Unknown option `-%c'.", optopt);
	    else
	      vtwrn ("Unknown option character `\\x%x'.", optopt);
	  }
	/* fall thru */
      case 'h':
      default:
	print_usage_and_exit ();
      }

  if (argc > (optind + 1))
    {
      fprintf (stderr, "Incorrect number of arguments!\n");
      print_usage_and_exit ();
    }
  else if (argc > 1 && argc == (optind + 1))
    {
      if (sscanf (argv[optind], "%d", &v) == 1)
	vsm->server_cfg.port = (uint16_t) v;
      else
	{
	  fprintf (stderr, "Invalid port (%s)!\n", argv[optind]);
	  print_usage_and_exit ();
	}
    }

  vcl_test_init_endpoint_addr (vsm);
}

int
vts_handle_ctrl_cfg (vcl_test_server_worker_t *wrk, vcl_test_cfg_t *rx_cfg,
		     vcl_test_session_t *conn, int rx_bytes)
{
  if (rx_cfg->verbose)
    {
      vtinf ("(fd %d): Received a cfg msg!", conn->fd);
      vcl_test_cfg_dump (rx_cfg, 0 /* is_client */ );
    }

  if (rx_bytes != sizeof (*rx_cfg))
    {
      vtinf ("(fd %d): Invalid cfg msg size %d expected %lu!", conn->fd,
	     rx_bytes, sizeof (*rx_cfg));
      conn->cfg.rxbuf_size = 0;
      conn->cfg.num_writes = 0;
      if (conn->cfg.verbose)
	{
	  vtinf ("(fd %d): Replying to cfg msg", conn->fd);
	  vcl_test_cfg_dump (rx_cfg, 0 /* is_client */ );
	}
      conn->write (conn, &conn->cfg, sizeof (conn->cfg));
      return -1;
    }

  switch (rx_cfg->test)
    {
    case VCL_TEST_TYPE_NONE:
    case VCL_TEST_TYPE_ECHO:
      sync_config_and_reply (conn, rx_cfg);
      break;

    case VCL_TEST_TYPE_BI:
    case VCL_TEST_TYPE_UNI:
      vts_test_cmd (wrk, conn, rx_cfg);
      break;

    case VCL_TEST_TYPE_EXIT:
      vtinf ("Ctrl session fd %d closing!", conn->fd);
      vts_session_cleanup (conn);
      wrk->nfds--;
      if (wrk->nfds)
	vts_wrk_cleanup_all (wrk);
      vcl_server_main.ctrl = 0;
      break;

    default:
      vtwrn ("Unknown test type %d", rx_cfg->test);
      vcl_test_cfg_dump (rx_cfg, 0 /* is_client */ );
      break;
    }

  return 0;
}

static void
vts_worker_init (vcl_test_server_worker_t * wrk)
{
  vcl_test_server_main_t *vsm = &vcl_server_main;
  vcl_test_main_t *vt = &vcl_test_main;
  const vcl_test_proto_vft_t *tp;
  struct epoll_event listen_ev;
  int rv;

  __wrk_index = wrk->wrk_index;

  vtinf ("Initializing worker ...");

  conn_pool_expand (wrk, VCL_TEST_CFG_MAX_TEST_SESS + 1);
  if (wrk->wrk_index)
    if (vppcom_worker_register ())
      vtfail ("vppcom_worker_register()", 1);

  tp = vt->protos[vsm->server_cfg.proto];
  if ((rv = tp->listen (&wrk->listener, &vsm->server_cfg.endpt)))
    vtfail ("proto listen", rv);

  /* First worker already has epoll fd */
  if (wrk->wrk_index)
    {
      wrk->epfd = vppcom_epoll_create ();
      if (wrk->epfd < 0)
	vtfail ("vppcom_epoll_create()", wrk->epfd);
    }

  listen_ev.events = EPOLLET | EPOLLIN;
  listen_ev.data.u32 = VCL_TEST_DATA_LISTENER;
  rv =
    vppcom_epoll_ctl (wrk->epfd, EPOLL_CTL_ADD, wrk->listener.fd, &listen_ev);
  if (rv < 0)
    vtfail ("vppcom_epoll_ctl", rv);

  vsm->active_workers += 1;
  vtinf ("Waiting for client data connections on port %d ...",
	 ntohs (vsm->server_cfg.endpt.port));
}

static inline int
vts_conn_read (vcl_test_session_t *conn)
{
  vcl_test_server_main_t *vsm = &vcl_server_main;
  if (vsm->use_ds)
    return vcl_test_read_ds (conn);
  else
    return conn->read (conn, conn->rxbuf, conn->rxbuf_size);
}

static void
vts_inc_stats_check (vcl_test_session_t *ts)
{
  /* Avoid checking time too often because of syscall cost */
  if (ts->stats.rx_bytes - ts->old_stats.rx_bytes < 1 << 20)
    return;

  clock_gettime (CLOCK_REALTIME, &ts->stats.stop);
  if (vcl_test_time_diff (&ts->old_stats.stop, &ts->stats.stop) > 1)
    {
      vcl_test_stats_dump_inc (ts, 1 /* is_rx */);
      ts->old_stats = ts->stats;
    }
}

static void *
vts_worker_loop (void *arg)
{
  struct epoll_event ep_evts[VCL_TEST_CFG_MAX_EPOLL_EVENTS];
  vcl_test_server_main_t *vsm = &vcl_server_main;
  vcl_test_server_worker_t *wrk = arg;
  vcl_test_session_t *conn;
  int i, rx_bytes, num_ev;
  vcl_test_cfg_t *rx_cfg;

  if (wrk->wrk_index)
    vts_worker_init (wrk);

  while (1)
    {
      num_ev =
	vppcom_epoll_wait (wrk->epfd, ep_evts, VCL_TEST_CFG_MAX_EPOLL_EVENTS,
			   0 /* poll session events */);
      if (num_ev < 0)
	{
	  vterr ("vppcom_epoll_wait()", num_ev);
	  goto fail;
	}
      else if (num_ev == 0)
	{
	  continue;
	}
      for (i = 0; i < num_ev; i++)
	{
	  conn = &wrk->conn_pool[ep_evts[i].data.u32];
	  /*
	   * Check for close events
	   */
	  if (ep_evts[i].events & (EPOLLHUP | EPOLLRDHUP))
	    {
	      if (conn == vsm->ctrl)
		{
		  vtinf ("ctrl session went away");
		  vsm->ctrl = 0;
		}
	      vts_session_cleanup (conn);
	      wrk->nfds--;
	      continue;
	    }

	  /*
	   * Check if new session needs to be accepted
	   */

	  if (!wrk->wrk_index && ep_evts[i].data.u32 == VCL_TEST_CTRL_LISTENER)
	    {
	      if (vsm->ctrl)
		{
		  vtwrn ("ctrl already exists");
		  continue;
		}
	      vsm->ctrl = vts_accept_ctrl (wrk, vsm->ctrl_listen_fd);
	      continue;
	    }

	  /* at this point ctrl session must be valid */
	  ASSERT (vsm->ctrl);

	  if (ep_evts[i].data.u32 == VCL_TEST_DATA_LISTENER)
	    {
	      conn = vts_accept_client (wrk, wrk->listener.fd);
	      conn->cfg = vsm->ctrl->cfg;
	      continue;
	    }
	  else if (vppcom_session_is_connectable_listener (conn->fd))
	    {
	      vts_accept_client (wrk, conn->fd);
	      continue;
	    }

	  /*
	   * Message on control session
	   */

	  if (!wrk->wrk_index && conn->fd == vsm->ctrl->fd)
	    {
	      rx_bytes = conn->read (conn, conn->rxbuf, conn->rxbuf_size);
	      rx_cfg = (vcl_test_cfg_t *) conn->rxbuf;
	      if (rx_cfg->magic == VCL_TEST_CFG_CTRL_MAGIC)
		{
		  vts_handle_ctrl_cfg (wrk, rx_cfg, conn, rx_bytes);
		  if (!wrk->nfds)
		    {
		      vtinf ("All client connections closed\n");
		      goto done;
		    }
		}
	      else if (isascii (conn->rxbuf[0]))
		{
		  vts_server_echo (conn, rx_bytes);
		}
	      else
		{
		  vtwrn ("FIFO not drained! extra bytes %d", rx_bytes);
		}
	      continue;
	    }

	  /*
	   * Read perf test data
	   */

	  if (EPOLLIN & ep_evts[i].events)
	    {
	    read_again:
	      rx_bytes = vts_conn_read (conn);

	      if (rx_bytes <= 0)
		{
		  if (errno == ECONNRESET)
		    {
		      vtinf ("Connection reset by remote peer.\n");
		      goto fail;
		    }
		  else
		    continue;
		}
	      vts_server_process_rx (conn, rx_bytes);
	      if (vppcom_session_attr (conn->fd, VPPCOM_ATTR_GET_NREAD, 0, 0) >
		  0)
		goto read_again;
	      if (vsm->incremental_stats)
		vts_inc_stats_check (conn);
	      continue;
	    }
	  else
	    {
	      vtwrn ("Unhandled event");
	      goto fail;
	    }
	}
    }

fail:
  vsm->worker_fails -= 1;

done:
  vppcom_session_close (wrk->listener.fd);
  if (wrk->conn_pool)
    free (wrk->conn_pool);
  vsm->active_workers -= 1;
  return 0;
}

static void
vts_ctrl_session_init (vcl_test_server_worker_t *wrk)
{
  vcl_test_server_main_t *vsm = &vcl_server_main;
  struct epoll_event listen_ev;
  int rv;

  vtinf ("Initializing main ctrl session ...");

  vsm->ctrl_listen_fd =
    vppcom_session_create (VPPCOM_PROTO_TCP, 0 /* is_nonblocking */);
  if (vsm->ctrl_listen_fd < 0)
    vtfail ("vppcom_session_create()", vsm->ctrl_listen_fd);

  rv = vppcom_session_bind (vsm->ctrl_listen_fd, &vsm->server_cfg.endpt);
  if (rv < 0)
    vtfail ("vppcom_session_bind()", rv);

  rv = vppcom_session_listen (vsm->ctrl_listen_fd, 10);
  if (rv < 0)
    vtfail ("vppcom_session_listen()", rv);

  wrk->epfd = vppcom_epoll_create ();
  if (wrk->epfd < 0)
    vtfail ("vppcom_epoll_create()", wrk->epfd);

  listen_ev.events = EPOLLET | EPOLLIN;
  listen_ev.data.u32 = VCL_TEST_CTRL_LISTENER;
  rv = vppcom_epoll_ctl (wrk->epfd, EPOLL_CTL_ADD, vsm->ctrl_listen_fd,
			 &listen_ev);
  if (rv < 0)
    vtfail ("vppcom_epoll_ctl", rv);

  vtinf ("Waiting for client ctrl connection on port %d ...",
	 vsm->server_cfg.port);
}

int
main (int argc, char **argv)
{
  vcl_test_server_main_t *vsm = &vcl_server_main;
  vcl_test_main_t *vt = &vcl_test_main;
  int rv, i;

  clib_mem_init_thread_safe (0, 64 << 20);
  vsm->server_cfg.port = VCL_TEST_SERVER_PORT;
  vsm->server_cfg.workers = 1;
  vsm->active_workers = 0;
  vcl_test_server_process_opts (vsm, argc, argv);

  rv = vppcom_app_create ("vcl_test_server");
  if (rv)
    vtfail ("vppcom_app_create()", rv);

  /* Protos like tls/dtls/quic need init */
  if (vt->protos[vsm->server_cfg.proto]->init)
    vt->protos[vsm->server_cfg.proto]->init (0);

  vsm->workers = calloc (vsm->server_cfg.workers, sizeof (*vsm->workers));
  vts_ctrl_session_init (&vsm->workers[0]);

  /* Update ctrl port to data port */
  vsm->server_cfg.endpt.port += 1;
  vts_worker_init (&vsm->workers[0]);
  for (i = 1; i < vsm->server_cfg.workers; i++)
    {
      vsm->workers[i].wrk_index = i;
      rv = pthread_create (&vsm->workers[i].thread_handle, NULL,
			   vts_worker_loop, (void *) &vsm->workers[i]);
    }

  vts_worker_loop (&vsm->workers[0]);

  while (vsm->active_workers > 0)
    ;

  vppcom_app_destroy ();
  free (vsm->workers);

  return vsm->worker_fails;
}

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