src/vcl/vcl_test_client.c

/*
 * Copyright (c) 2017-2018 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 <stdlib.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <time.h>
#include <arpa/inet.h>
#include <vcl/vcl_test.h>
#include <pthread.h>

typedef struct
{
  sock_test_socket_t *sessions;
  uint32_t n_sessions;
  uint32_t wrk_index;
  fd_set wr_fdset;
  fd_set rd_fdset;
  int max_fd_index;
  pthread_t thread_handle;
  sock_test_cfg_t cfg;
} vcl_test_client_worker_t;

typedef struct
{
  vcl_test_client_worker_t *workers;
  vppcom_endpt_t server_endpt;
  uint32_t cfg_seq_num;
  sock_test_socket_t ctrl_socket;
  sock_test_socket_t *sessions;
  uint8_t dump_cfg;
  sock_test_t post_test;
  uint32_t proto;
  uint32_t n_workers;
  volatile int active_workers;
  struct sockaddr_storage server_addr;
} vcl_test_client_main_t;

static __thread int __wrk_index = 0;

vcl_test_client_main_t vcl_client_main;

#define vtc_min(a, b) (a < b ? a : b)
#define vtc_max(a, b) (a > b ? a : b)

static int
vtc_cfg_sync (sock_test_socket_t * sock)
{
  vcl_test_client_main_t *vcm = &vcl_client_main;
  sock_test_cfg_t *rx_cfg = (sock_test_cfg_t *) sock->rxbuf;
  int rx_bytes, tx_bytes;

  vt_atomic_add (&sock->cfg.seq_num, 1);
  if (sock->cfg.verbose)
    {
      vtinf ("(fd %d): Sending config to server.", sock->fd);
      sock_test_cfg_dump (&sock->cfg, 1 /* is_client */ );
    }
  tx_bytes = vcl_test_write (sock->fd, (uint8_t *) & sock->cfg,
			     sizeof (sock->cfg), NULL, sock->cfg.verbose);
  if (tx_bytes < 0)
    {
      vtwrn ("(fd %d): write test cfg failed (%d)!", sock->fd, tx_bytes);
      return tx_bytes;
    }

  rx_bytes = vcl_test_read (sock->fd, (uint8_t *) sock->rxbuf,
			    sizeof (sock_test_cfg_t), NULL);
  if (rx_bytes < 0)
    return rx_bytes;

  if (rx_cfg->magic != SOCK_TEST_CFG_CTRL_MAGIC)
    {
      vtwrn ("(fd %d): Bad server reply cfg -- aborting!", sock->fd);
      return -1;
    }
  if ((rx_bytes != sizeof (sock_test_cfg_t))
      || !sock_test_cfg_verify (rx_cfg, &sock->cfg))
    {
      vtwrn ("(fd %d): Invalid config received from server!", sock->fd);
      if (rx_bytes != sizeof (sock_test_cfg_t))
	{
	  vtinf ("\tRx bytes %d != cfg size %lu", rx_bytes,
		 sizeof (sock_test_cfg_t));
	}
      else
	{
	  sock_test_cfg_dump (rx_cfg, 1 /* is_client */ );
	  vtinf ("(fd %d): Valid config sent to server.", sock->fd);
	  sock_test_cfg_dump (&sock->cfg, 1 /* is_client */ );
	}
      return -1;
    }
  if (sock->cfg.verbose)
    {
      vtinf ("(fd %d): Got config back from server.", sock->fd);
      sock_test_cfg_dump (rx_cfg, 1 /* is_client */ );
    }

  return 0;
}

static int
vtc_connect_test_sessions (vcl_test_client_worker_t * wrk)
{
  vcl_test_client_main_t *vcm = &vcl_client_main;
  sock_test_socket_t *tsock;
  uint32_t n_test_sessions;
  int i, rv;

  n_test_sessions = wrk->cfg.num_test_sockets;
  if (n_test_sessions < 1)
    {
      errno = EINVAL;
      return -1;
    }

  if (wrk->n_sessions >= n_test_sessions)
    goto done;

  if (wrk->n_sessions)
    wrk->sessions = realloc (wrk->sessions,
			     n_test_sessions * sizeof (sock_test_socket_t));
  else
    wrk->sessions = calloc (n_test_sessions, sizeof (sock_test_socket_t));

  if (!wrk->sessions)
    {
      vterr ("failed to alloc sessions", -errno);
      return errno;
    }

  for (i = 0; i < n_test_sessions; i++)
    {
      tsock = &wrk->sessions[i];
      tsock->fd = vppcom_session_create (vcm->proto, 1 /* is_nonblocking */ );
      if (tsock->fd < 0)
	{
	  vterr ("vppcom_session_create()", tsock->fd);
	  return tsock->fd;
	}

      rv = vppcom_session_connect (tsock->fd, &vcm->server_endpt);
      if (rv < 0)
	{
	  vterr ("vppcom_session_connect()", rv);
	  return rv;
	}
      vtinf ("(fd %d): Test socket %d connected.", tsock->fd, i);
    }
  wrk->n_sessions = n_test_sessions;

done:
  vtinf ("All test sessions (%d) connected!", n_test_sessions);
  return 0;
}

static int
vtc_worker_test_setup (vcl_test_client_worker_t * wrk)
{
  vcl_test_client_main_t *vcm = &vcl_client_main;
  sock_test_socket_t *ctrl = &vcm->ctrl_socket;
  sock_test_cfg_t *cfg = &wrk->cfg;
  sock_test_socket_t *tsock;
  uint32_t sidx;
  int i, j;

  FD_ZERO (&wrk->wr_fdset);
  FD_ZERO (&wrk->rd_fdset);

  for (i = 0; i < cfg->num_test_sockets; i++)
    {
      tsock = &wrk->sessions[i];
      tsock->cfg = wrk->cfg;
      sock_test_socket_buf_alloc (tsock);

      switch (cfg->test)
	{
	case SOCK_TEST_TYPE_ECHO:
	  memcpy (tsock->txbuf, ctrl->txbuf, cfg->total_bytes);
	  break;
	case SOCK_TEST_TYPE_UNI:
	case SOCK_TEST_TYPE_BI:
	  for (j = 0; j < tsock->txbuf_size; j++)
	    tsock->txbuf[j] = j & 0xff;
	  break;
	}

      FD_SET (vppcom_session_index (tsock->fd), &wrk->wr_fdset);
      FD_SET (vppcom_session_index (tsock->fd), &wrk->rd_fdset);
      sidx = vppcom_session_index (tsock->fd);
      wrk->max_fd_index = vtc_max (sidx, wrk->max_fd_index);
    }
  wrk->max_fd_index += 1;

  return 0;
}

static int
vtc_worker_init (vcl_test_client_worker_t * wrk)
{
  vcl_test_client_main_t *vcm = &vcl_client_main;
  sock_test_socket_t *ctrl = &vcm->ctrl_socket;
  sock_test_cfg_t *cfg = &wrk->cfg;
  sock_test_socket_t *tsock;
  uint32_t i, n;
  int rv, nbytes;

  __wrk_index = wrk->wrk_index;

  vtinf ("Initializing worker ...");

  if (wrk->wrk_index)
    {
      if (vppcom_worker_register ())
	{
	  vtwrn ("failed to register worker");
	  return -1;
	}
      vt_atomic_add (&vcm->active_workers, 1);
    }
  rv = vtc_connect_test_sessions (wrk);
  if (rv)
    {
      vterr ("vtc_connect_test_sockets ()", rv);
      return rv;
    }

  if (vtc_worker_test_setup (wrk))
    return -1;

  vtinf ("Sending config to server on all sessions ...");

  for (n = 0; n < cfg->num_test_sockets; n++)
    {
      tsock = &wrk->sessions[n];
      if (vtc_cfg_sync (tsock))
	return -1;
      memset (&tsock->stats, 0, sizeof (tsock->stats));
    }

  return 0;
}

static int stats_lock = 0;

static void
vtc_accumulate_stats (vcl_test_client_worker_t * wrk,
		      sock_test_socket_t * ctrl)
{
  sock_test_socket_t *tsock;
  static char buf[64];
  int i, show_rx = 0;

  while (__sync_lock_test_and_set (&stats_lock, 1))
    ;

  if (ctrl->cfg.test == SOCK_TEST_TYPE_BI
      || ctrl->cfg.test == SOCK_TEST_TYPE_ECHO)
    show_rx = 1;

  for (i = 0; i < wrk->cfg.num_test_sockets; i++)
    {
      tsock = &wrk->sessions[i];
      tsock->stats.start = ctrl->stats.start;

      if (ctrl->cfg.verbose > 1)
	{
	  sprintf (buf, "CLIENT (fd %d) RESULTS", tsock->fd);
	  sock_test_stats_dump (buf, &tsock->stats, show_rx, 1 /* show tx */ ,
				ctrl->cfg.verbose);
	}

      sock_test_stats_accumulate (&ctrl->stats, &tsock->stats);
    }

  __sync_lock_release (&stats_lock);
}

static void
vtc_worker_sessions_exit (vcl_test_client_worker_t * wrk)
{
  vcl_test_client_main_t *vcm = &vcl_client_main;
  sock_test_socket_t *ctrl = &vcm->ctrl_socket;
  sock_test_socket_t *tsock;
  int i, verbose = ctrl->cfg.verbose;

  for (i = 0; i < wrk->cfg.num_test_sockets; i++)
    {
      tsock = &wrk->sessions[i];
      tsock->cfg.test = SOCK_TEST_TYPE_EXIT;

      if (verbose)
	{
	  vtinf ("(fd %d): Sending exit cfg to server...", tsock->fd);
	  sock_test_cfg_dump (&tsock->cfg, 1 /* is_client */ );
	}
      (void) vcl_test_write (tsock->fd, (uint8_t *) & tsock->cfg,
			     sizeof (tsock->cfg), &tsock->stats, verbose);
    }
}

static void *
vtc_worker_loop (void *arg)
{
  vcl_test_client_main_t *vcm = &vcl_client_main;
  sock_test_socket_t *ctrl = &vcm->ctrl_socket;
  vcl_test_client_worker_t *wrk = arg;
  fd_set _wfdset, *wfdset = &_wfdset;
  fd_set _rfdset, *rfdset = &_rfdset;
  sock_test_socket_t *tsock;
  uint32_t n_active_sessions;
  int i, rv, check_rx = 0;

  rv = vtc_worker_init (wrk);
  if (rv)
    {
      vterr ("vtc_worker_init()", rv);
      return 0;
    }

  vtinf ("Starting test ...");

  if (wrk->wrk_index == 0)
    clock_gettime (CLOCK_REALTIME, &ctrl->stats.start);

  check_rx = wrk->cfg.test != SOCK_TEST_TYPE_UNI;
  n_active_sessions = wrk->cfg.num_test_sockets;
  while (n_active_sessions)
    {
      _wfdset = wrk->wr_fdset;
      _rfdset = wrk->rd_fdset;

      rv = vppcom_select (wrk->max_fd_index, (uint64_t *) rfdset,
			  (uint64_t *) wfdset, NULL, 0);
      if (rv < 0)
	{
	  vterr ("vppcom_select()", rv);
	  goto exit;
	}
      else if (rv == 0)
	continue;

      for (i = 0; i < wrk->cfg.num_test_sockets; i++)
	{
	  tsock = &wrk->sessions[i];
	  if (!((tsock->stats.stop.tv_sec == 0) &&
		(tsock->stats.stop.tv_nsec == 0)))
	    continue;

	  if (FD_ISSET (vppcom_session_index (tsock->fd), rfdset)
	      && tsock->stats.rx_bytes < tsock->cfg.total_bytes)
	    {
	      (void) vcl_test_read (tsock->fd, (uint8_t *) tsock->rxbuf,
				    tsock->rxbuf_size, &tsock->stats);
	    }

	  if (FD_ISSET (vppcom_session_index (tsock->fd), wfdset)
	      && tsock->stats.tx_bytes < tsock->cfg.total_bytes)
	    {
	      rv = vcl_test_write (tsock->fd, (uint8_t *) tsock->txbuf,
				   tsock->cfg.txbuf_size, &tsock->stats,
				   tsock->cfg.verbose);
	      if (rv < 0)
		{
		  vtwrn ("vppcom_test_write (%d) failed -- aborting test",
			 tsock->fd);
		  goto exit;
		}
	    }

	  if ((!check_rx && tsock->stats.tx_bytes >= tsock->cfg.total_bytes)
	      || (check_rx
		  && tsock->stats.rx_bytes >= tsock->cfg.total_bytes))
	    {
	      clock_gettime (CLOCK_REALTIME, &tsock->stats.stop);
	      n_active_sessions--;
	    }
	}
    }
exit:
  vtinf ("Worker %d done ...", wrk->wrk_index);
  vtc_accumulate_stats (wrk, ctrl);
  sleep (1);
  vtc_worker_sessions_exit (wrk);
  if (wrk->wrk_index)
    vt_atomic_add (&vcm->active_workers, -1);
  return 0;
}

static void
vtc_print_stats (sock_test_socket_t * ctrl)
{
  int is_echo = ctrl->cfg.test == SOCK_TEST_TYPE_ECHO;
  int show_rx = 0;
  char buf[64];

  if (ctrl->cfg.test == SOCK_TEST_TYPE_BI
      || ctrl->cfg.test == SOCK_TEST_TYPE_ECHO)
    show_rx = 1;

  sock_test_stats_dump ("CLIENT RESULTS", &ctrl->stats,
			show_rx, 1 /* show tx */ ,
			ctrl->cfg.verbose);
  sock_test_cfg_dump (&ctrl->cfg, 1 /* is_client */ );

  if (ctrl->cfg.verbose)
    {
      vtinf ("  ctrl socket info\n"
	     SOCK_TEST_SEPARATOR_STRING
	     "          fd:  %d (0x%08x)\n"
	     "       rxbuf:  %p\n"
	     "  rxbuf size:  %u (0x%08x)\n"
	     "       txbuf:  %p\n"
	     "  txbuf size:  %u (0x%08x)\n"
	     SOCK_TEST_SEPARATOR_STRING,
	     ctrl->fd, (uint32_t) ctrl->fd,
	     ctrl->rxbuf, ctrl->rxbuf_size, ctrl->rxbuf_size,
	     ctrl->txbuf, ctrl->txbuf_size, ctrl->txbuf_size);
    }

  if (is_echo)
    sprintf (buf, "Echo");
  else
    sprintf (buf, "%s-directional Stream",
	     ctrl->cfg.test == SOCK_TEST_TYPE_BI ? "Bi" : "Uni");

  vtinf ("(fd %d): %s Test Complete!\n"
	 SOCK_TEST_BANNER_STRING, ctrl->fd, buf);
}

static void
vtc_echo_client (vcl_test_client_main_t * vcm)
{
  vcl_test_client_worker_t *wrk;
  sock_test_socket_t *ctrl = &vcm->ctrl_socket;
  sock_test_cfg_t *cfg = &ctrl->cfg;

  cfg->total_bytes = strlen (ctrl->txbuf) + 1;
  memset (&ctrl->stats, 0, sizeof (ctrl->stats));

  /* Echo works with only one worker */
  wrk = vcm->workers;
  wrk->wrk_index = 0;
  wrk->cfg = *cfg;

  vtc_worker_loop (wrk);

  clock_gettime (CLOCK_REALTIME, &ctrl->stats.stop);
  vtc_accumulate_stats (wrk, ctrl);
  vtc_print_stats (ctrl);
}

static void
vtc_stream_client (vcl_test_client_main_t * vcm)
{
  sock_test_socket_t *ctrl = &vcm->ctrl_socket;
  sock_test_cfg_t *cfg = &ctrl->cfg;
  vcl_test_client_worker_t *wrk;
  sock_test_socket_t *tsock;
  int tx_bytes, rv;
  uint32_t i, n, sidx, n_conn, n_conn_per_wrk;

  vtinf (SOCK_TEST_BANNER_STRING "%s-directional Stream Test!\n",
	 ctrl->cfg.test == SOCK_TEST_TYPE_BI ? "Bi" : "Uni");

  cfg->total_bytes = cfg->num_writes * cfg->txbuf_size;
  cfg->ctrl_handle = ~0;
  if (vtc_cfg_sync (ctrl))
    {
      vtwrn ("test cfg sync failed -- aborting!");
      return;
    }
  cfg->ctrl_handle = ((sock_test_cfg_t *) ctrl->rxbuf)->ctrl_handle;
  memset (&ctrl->stats, 0, sizeof (ctrl->stats));

  n_conn = cfg->num_test_sockets;
  n_conn_per_wrk = n_conn / vcm->n_workers;
  for (i = 0; i < vcm->n_workers; i++)
    {
      wrk = &vcm->workers[i];
      wrk->wrk_index = i;
      wrk->cfg = ctrl->cfg;
      wrk->cfg.num_test_sockets = vtc_min (n_conn_per_wrk, n_conn);
      n_conn -= wrk->cfg.num_test_sockets;
    }

  for (i = 1; i < vcm->n_workers; i++)
    {
      wrk = &vcm->workers[i];
      pthread_create (&wrk->thread_handle, NULL, vtc_worker_loop,
		      (void *) wrk);
    }
  vtc_worker_loop (&vcm->workers[0]);

  while (vcm->active_workers > 0)
    ;

  clock_gettime (CLOCK_REALTIME, &ctrl->stats.stop);

  vtinf ("(fd %d): Sending config on ctrl socket for stats...\n", ctrl->fd);
  if (vtc_cfg_sync (ctrl))
    {
      vtwrn ("test cfg sync failed -- aborting!");
      return;
    }

  vtc_print_stats (ctrl);

  ctrl->cfg.test = SOCK_TEST_TYPE_ECHO;
  ctrl->cfg.total_bytes = 0;
  if (vtc_cfg_sync (ctrl))
    vtwrn ("post-test cfg sync failed!");
}

static void
dump_help (void)
{
#define INDENT "\n  "

  printf ("CLIENT: Test configuration commands:"
	  INDENT SOCK_TEST_TOKEN_HELP
	  "\t\t\tDisplay help."
	  INDENT SOCK_TEST_TOKEN_EXIT
	  "\t\t\tExit test client & server."
	  INDENT SOCK_TEST_TOKEN_SHOW_CFG
	  "\t\t\tShow the current test cfg."
	  INDENT SOCK_TEST_TOKEN_RUN_UNI
	  "\t\t\tRun the Uni-directional test."
	  INDENT SOCK_TEST_TOKEN_RUN_BI
	  "\t\t\tRun the Bi-directional test."
	  INDENT SOCK_TEST_TOKEN_VERBOSE
	  "\t\t\tToggle verbose setting."
	  INDENT SOCK_TEST_TOKEN_RXBUF_SIZE
	  "<rxbuf size>\tRx buffer size (bytes)."
	  INDENT SOCK_TEST_TOKEN_TXBUF_SIZE
	  "<txbuf size>\tTx buffer size (bytes)."
	  INDENT SOCK_TEST_TOKEN_NUM_WRITES
	  "<# of writes>\tNumber of txbuf writes to server." "\n");
}

static void
cfg_txbuf_size_set (void)
{
  vcl_test_client_main_t *vcm = &vcl_client_main;
  sock_test_socket_t *ctrl = &vcm->ctrl_socket;
  char *p = ctrl->txbuf + strlen (SOCK_TEST_TOKEN_TXBUF_SIZE);
  uint64_t txbuf_size = strtoull ((const char *) p, NULL, 10);

  if (txbuf_size >= SOCK_TEST_CFG_BUF_SIZE_MIN)
    {
      ctrl->cfg.txbuf_size = txbuf_size;
      ctrl->cfg.total_bytes = ctrl->cfg.num_writes * ctrl->cfg.txbuf_size;
      sock_test_buf_alloc (&ctrl->cfg, 0 /* is_rxbuf */ ,
			   (uint8_t **) & ctrl->txbuf, &ctrl->txbuf_size);
      sock_test_cfg_dump (&ctrl->cfg, 1 /* is_client */ );
    }
  else
    fprintf (stderr, "CLIENT: ERROR: Invalid txbuf size (%lu) < "
	     "minimum buf size (%u)!\n",
	     txbuf_size, SOCK_TEST_CFG_BUF_SIZE_MIN);
}

static void
cfg_num_writes_set (void)
{
  vcl_test_client_main_t *vcm = &vcl_client_main;
  sock_test_socket_t *ctrl = &vcm->ctrl_socket;
  char *p = ctrl->txbuf + strlen (SOCK_TEST_TOKEN_NUM_WRITES);
  uint32_t num_writes = strtoul ((const char *) p, NULL, 10);

  if (num_writes > 0)
    {
      ctrl->cfg.num_writes = num_writes;
      ctrl->cfg.total_bytes = ctrl->cfg.num_writes * ctrl->cfg.txbuf_size;
      sock_test_cfg_dump (&ctrl->cfg, 1 /* is_client */ );
    }
  else
    {
      fprintf (stderr, "CLIENT: ERROR: invalid num writes: %u\n", num_writes);
    }
}

static void
cfg_num_test_sockets_set (void)
{
  vcl_test_client_main_t *vcm = &vcl_client_main;
  sock_test_socket_t *ctrl = &vcm->ctrl_socket;
  char *p = ctrl->txbuf + strlen (SOCK_TEST_TOKEN_NUM_TEST_SCKTS);
  uint32_t num_test_sockets = strtoul ((const char *) p, NULL, 10);

  if ((num_test_sockets > 0) &&
      (num_test_sockets <= SOCK_TEST_CFG_MAX_TEST_SCKTS))
    {
      ctrl->cfg.num_test_sockets = num_test_sockets;
      sock_test_cfg_dump (&ctrl->cfg, 1 /* is_client */ );
    }
  else
    {
      vtwrn ("invalid num test sockets: %u, (%d max)",
	     num_test_sockets, SOCK_TEST_CFG_MAX_TEST_SCKTS);
    }
}

static void
cfg_rxbuf_size_set (void)
{
  vcl_test_client_main_t *vcm = &vcl_client_main;
  sock_test_socket_t *ctrl = &vcm->ctrl_socket;
  char *p = ctrl->txbuf + strlen (SOCK_TEST_TOKEN_RXBUF_SIZE);
  uint64_t rxbuf_size = strtoull ((const char *) p, NULL, 10);

  if (rxbuf_size >= SOCK_TEST_CFG_BUF_SIZE_MIN)
    {
      ctrl->cfg.rxbuf_size = rxbuf_size;
      sock_test_buf_alloc (&ctrl->cfg, 1 /* is_rxbuf */ ,
			   (uint8_t **) & ctrl->rxbuf, &ctrl->rxbuf_size);
      sock_test_cfg_dump (&ctrl->cfg, 1 /* is_client */ );
    }
  else
    fprintf (stderr, "CLIENT: ERROR: Invalid rxbuf size (%lu) < "
	     "minimum buf size (%u)!\n",
	     rxbuf_size, SOCK_TEST_CFG_BUF_SIZE_MIN);
}

static void
cfg_verbose_toggle (void)
{
  vcl_test_client_main_t *vcm = &vcl_client_main;
  sock_test_socket_t *ctrl = &vcm->ctrl_socket;

  ctrl->cfg.verbose = ctrl->cfg.verbose ? 0 : 1;
  sock_test_cfg_dump (&ctrl->cfg, 1 /* is_client */ );

}

static sock_test_t
parse_input ()
{
  vcl_test_client_main_t *vcm = &vcl_client_main;
  sock_test_socket_t *ctrl = &vcm->ctrl_socket;
  sock_test_t rv = SOCK_TEST_TYPE_NONE;

  if (!strncmp (SOCK_TEST_TOKEN_EXIT, ctrl->txbuf,
		strlen (SOCK_TEST_TOKEN_EXIT)))
    rv = SOCK_TEST_TYPE_EXIT;

  else if (!strncmp (SOCK_TEST_TOKEN_HELP, ctrl->txbuf,
		     strlen (SOCK_TEST_TOKEN_HELP)))
    dump_help ();

  else if (!strncmp (SOCK_TEST_TOKEN_SHOW_CFG, ctrl->txbuf,
		     strlen (SOCK_TEST_TOKEN_SHOW_CFG)))
    vcm->dump_cfg = 1;

  else if (!strncmp (SOCK_TEST_TOKEN_VERBOSE, ctrl->txbuf,
		     strlen (SOCK_TEST_TOKEN_VERBOSE)))
    cfg_verbose_toggle ();

  else if (!strncmp (SOCK_TEST_TOKEN_TXBUF_SIZE, ctrl->txbuf,
		     strlen (SOCK_TEST_TOKEN_TXBUF_SIZE)))
    cfg_txbuf_size_set ();

  else if (!strncmp (SOCK_TEST_TOKEN_NUM_TEST_SCKTS, ctrl->txbuf,
		     strlen (SOCK_TEST_TOKEN_NUM_TEST_SCKTS)))
    cfg_num_test_sockets_set ();

  else if (!strncmp (SOCK_TEST_TOKEN_NUM_WRITES, ctrl->txbuf,
		     strlen (SOCK_TEST_TOKEN_NUM_WRITES)))
    cfg_num_writes_set ();

  else if (!strncmp (SOCK_TEST_TOKEN_RXBUF_SIZE, ctrl->txbuf,
		     strlen (SOCK_TEST_TOKEN_RXBUF_SIZE)))
    cfg_rxbuf_size_set ();

  else if (!strncmp (SOCK_TEST_TOKEN_RUN_UNI, ctrl->txbuf,
		     strlen (SOCK_TEST_TOKEN_RUN_UNI)))
    rv = ctrl->cfg.test = SOCK_TEST_TYPE_UNI;

  else if (!strncmp (SOCK_TEST_TOKEN_RUN_BI, ctrl->txbuf,
		     strlen (SOCK_TEST_TOKEN_RUN_BI)))
    rv = ctrl->cfg.test = SOCK_TEST_TYPE_BI;

  else
    rv = SOCK_TEST_TYPE_ECHO;

  return rv;
}

void
print_usage_and_exit (void)
{
  fprintf (stderr,
	   "sock_test_client [OPTIONS] <ipaddr> <port>\n"
	   "  OPTIONS\n"
	   "  -h               Print this message and exit.\n"
	   "  -6               Use IPv6\n"
	   "  -u               Use UDP transport layer\n"
	   "  -c               Print test config before test.\n"
	   "  -w <dir>         Write test results to <dir>.\n"
	   "  -X               Exit after running test.\n"
	   "  -E               Run Echo test.\n"
	   "  -N <num-writes>  Test Cfg: number of writes.\n"
	   "  -R <rxbuf-size>  Test Cfg: rx buffer size.\n"
	   "  -T <txbuf-size>  Test Cfg: tx buffer size.\n"
	   "  -U               Run Uni-directional test.\n"
	   "  -B               Run Bi-directional test.\n"
	   "  -V               Verbose mode.\n");
  exit (1);
}

static void
vtc_process_opts (vcl_test_client_main_t * vcm, int argc, char **argv)
{
  sock_test_socket_t *ctrl = &vcm->ctrl_socket;
  int c, v;

  opterr = 0;
  while ((c = getopt (argc, argv, "chn:w:XE:I:N:R:T:UBV6D")) != -1)
    switch (c)
      {
      case 'c':
	vcm->dump_cfg = 1;
	break;

      case 's':
	if (sscanf (optarg, "0x%x", &ctrl->cfg.num_test_sockets) != 1)
	  if (sscanf (optarg, "%u", &ctrl->cfg.num_test_sockets) != 1)
	    {
	      vtwrn ("Invalid value for option -%c!", c);
	      print_usage_and_exit ();
	    }
	if (!ctrl->cfg.num_test_sockets ||
	    (ctrl->cfg.num_test_sockets > FD_SETSIZE))
	  {
	    vtwrn ("Invalid number of sockets (%d) specified for option -%c!"
		   "\n       Valid range is 1 - %d",
		   ctrl->cfg.num_test_sockets, c, FD_SETSIZE);
	    print_usage_and_exit ();
	  }
	break;

      case 'w':
	if (sscanf (optarg, "%d", &v) != 1)
	  {
	    vtwrn ("Invalid value for option -%c!", c);
	    print_usage_and_exit ();
	  }
	if (v > 1)
	  vcm->n_workers = v;
	break;

      case 'X':
	vcm->post_test = SOCK_TEST_TYPE_EXIT;
	break;

      case 'E':
	if (strlen (optarg) > ctrl->txbuf_size)
	  {
	    vtwrn ("Option -%c value larger than txbuf size (%d)!",
		   optopt, ctrl->txbuf_size);
	    print_usage_and_exit ();
	  }
	strcpy (ctrl->txbuf, optarg);
	ctrl->cfg.test = SOCK_TEST_TYPE_ECHO;
	break;

      case 'I':
	if (sscanf (optarg, "0x%x", &ctrl->cfg.num_test_sockets) != 1)
	  if (sscanf (optarg, "%d", &ctrl->cfg.num_test_sockets) != 1)
	    {
	      vtwrn ("Invalid value for option -%c!", c);
	      print_usage_and_exit ();
	    }
	if (ctrl->cfg.num_test_sockets > SOCK_TEST_CFG_MAX_TEST_SCKTS)
	  {
	    vtwrn ("value greater than max number test sockets (%d)!",
		   SOCK_TEST_CFG_MAX_TEST_SCKTS);
	    print_usage_and_exit ();
	  }
	break;

      case 'N':
	if (sscanf (optarg, "0x%lx", &ctrl->cfg.num_writes) != 1)
	  if (sscanf (optarg, "%ld", &ctrl->cfg.num_writes) != 1)
	    {
	      vtwrn ("Invalid value for option -%c!", c);
	      print_usage_and_exit ();
	    }
	ctrl->cfg.total_bytes = ctrl->cfg.num_writes * ctrl->cfg.txbuf_size;
	break;

      case 'R':
	if (sscanf (optarg, "0x%lx", &ctrl->cfg.rxbuf_size) != 1)
	  if (sscanf (optarg, "%ld", &ctrl->cfg.rxbuf_size) != 1)
	    {
	      vtwrn ("Invalid value for option -%c!", c);
	      print_usage_and_exit ();
	    }
	if (ctrl->cfg.rxbuf_size >= SOCK_TEST_CFG_BUF_SIZE_MIN)
	  {
	    ctrl->rxbuf_size = ctrl->cfg.rxbuf_size;
	    sock_test_buf_alloc (&ctrl->cfg, 1 /* is_rxbuf */ ,
				 (uint8_t **) & ctrl->rxbuf,
				 &ctrl->rxbuf_size);
	  }
	else
	  {
	    vtwrn ("rxbuf size (%lu) less than minumum (%u)",
		   ctrl->cfg.rxbuf_size, SOCK_TEST_CFG_BUF_SIZE_MIN);
	    print_usage_and_exit ();
	  }

	break;

      case 'T':
	if (sscanf (optarg, "0x%lx", &ctrl->cfg.txbuf_size) != 1)
	  if (sscanf (optarg, "%ld", &ctrl->cfg.txbuf_size) != 1)
	    {
	      vtwrn ("Invalid value for option -%c!", c);
	      print_usage_and_exit ();
	    }
	if (ctrl->cfg.txbuf_size >= SOCK_TEST_CFG_BUF_SIZE_MIN)
	  {
	    ctrl->txbuf_size = ctrl->cfg.txbuf_size;
	    sock_test_buf_alloc (&ctrl->cfg, 0 /* is_rxbuf */ ,
				 (uint8_t **) & ctrl->txbuf,
				 &ctrl->txbuf_size);
	    ctrl->cfg.total_bytes =
	      ctrl->cfg.num_writes * ctrl->cfg.txbuf_size;
	  }
	else
	  {
	    vtwrn ("txbuf size (%lu) less than minumum (%u)!",
		   ctrl->cfg.txbuf_size, SOCK_TEST_CFG_BUF_SIZE_MIN);
	    print_usage_and_exit ();
	  }
	break;

      case 'U':
	ctrl->cfg.test = SOCK_TEST_TYPE_UNI;
	break;

      case 'B':
	ctrl->cfg.test = SOCK_TEST_TYPE_BI;
	break;

      case 'V':
	ctrl->cfg.verbose = 1;
	break;

      case '6':
	ctrl->cfg.address_ip6 = 1;
	break;

      case 'D':
	ctrl->cfg.transport_udp = 1;
	break;

      case '?':
	switch (optopt)
	  {
	  case 'E':
	  case 'I':
	  case 'N':
	  case 'R':
	  case 'T':
	  case 'w':
	    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 + 2))
    {
      vtwrn ("Insufficient number of arguments!");
      print_usage_and_exit ();
    }
  vcm->proto = ctrl->cfg.transport_udp ? VPPCOM_PROTO_UDP : VPPCOM_PROTO_TCP;

  memset (&vcm->server_addr, 0, sizeof (vcm->server_addr));
  if (ctrl->cfg.address_ip6)
    {
      struct sockaddr_in6 *sddr6 = (struct sockaddr_in6 *) &vcm->server_addr;
      sddr6->sin6_family = AF_INET6;
      inet_pton (AF_INET6, argv[optind++], &(sddr6->sin6_addr));
      sddr6->sin6_port = htons (atoi (argv[optind]));

      vcm->server_endpt.is_ip4 = 0;
      vcm->server_endpt.ip = (uint8_t *) & sddr6->sin6_addr;
      vcm->server_endpt.port = (uint16_t) sddr6->sin6_port;
    }
  else
    {
      struct sockaddr_in *saddr4 = (struct sockaddr_in *) &vcm->server_addr;
      saddr4->sin_family = AF_INET;
      inet_pton (AF_INET, argv[optind++], &(saddr4->sin_addr));
      saddr4->sin_port = htons (atoi (argv[optind]));

      vcm->server_endpt.is_ip4 = 1;
      vcm->server_endpt.ip = (uint8_t *) & saddr4->sin_addr;
      vcm->server_endpt.port = (uint16_t) saddr4->sin_port;
    }
}

static void
vtc_read_user_input (sock_test_socket_t * ctrl)
{
  printf ("\nType some characters and hit <return>\n"
	  "('" SOCK_TEST_TOKEN_HELP "' for help): ");

  if (fgets (ctrl->txbuf, ctrl->txbuf_size, stdin) != NULL)
    {
      if (strlen (ctrl->txbuf) == 1)
	{
	  printf ("\nNothing to send!  Please try again...\n");
	  return;
	}
      ctrl->txbuf[strlen (ctrl->txbuf) - 1] = 0;	// chomp the newline.

      /* Parse input for keywords */
      ctrl->cfg.test = parse_input ();
    }
}

static void
vtc_ctrl_session_exit (void)
{
  vcl_test_client_main_t *vcm = &vcl_client_main;
  sock_test_socket_t *ctrl = &vcm->ctrl_socket;
  int verbose = ctrl->cfg.verbose;

  ctrl->cfg.test = SOCK_TEST_TYPE_EXIT;
  if (verbose)
    {
      vtinf ("(fd %d): Sending exit cfg to server...", ctrl->fd);
      sock_test_cfg_dump (&ctrl->cfg, 1 /* is_client */ );
    }
  (void) vcl_test_write (ctrl->fd, (uint8_t *) & ctrl->cfg,
			 sizeof (ctrl->cfg), &ctrl->stats, verbose);
  vtinf ("So long and thanks for all the fish!\n\n");
  sleep (1);
}

int
main (int argc, char **argv)
{
  vcl_test_client_main_t *vcm = &vcl_client_main;
  sock_test_socket_t *ctrl = &vcm->ctrl_socket;
  int rv, errno_val;

  vcm->n_workers = 1;
  sock_test_cfg_init (&ctrl->cfg);
  sock_test_socket_buf_alloc (ctrl);
  vtc_process_opts (vcm, argc, argv);

  vcm->workers = calloc (vcm->n_workers, sizeof (vcl_test_client_worker_t));
  rv = vppcom_app_create ("vcl_test_client");
  if (rv < 0)
    vtfail ("vppcom_app_create()", rv);

  ctrl->fd = vppcom_session_create (vcm->proto, 0 /* is_nonblocking */ );
  if (ctrl->fd < 0)
    vtfail ("vppcom_session_create()", ctrl->fd);

  vtinf ("Connecting to server...");
  rv = vppcom_session_connect (ctrl->fd, &vcm->server_endpt);
  if (rv)
    vtfail ("vppcom_session_connect()", rv);
  vtinf ("(fd %d): Control socket connected.", ctrl->fd);

  rv = vtc_cfg_sync (ctrl);
  if (rv)
    vtfail ("vtc_cfg_sync()", rv);

  ctrl->cfg.ctrl_handle = ((sock_test_cfg_t *) ctrl->rxbuf)->ctrl_handle;
  memset (&ctrl->stats, 0, sizeof (ctrl->stats));

  while (ctrl->cfg.test != SOCK_TEST_TYPE_EXIT)
    {
      if (vcm->dump_cfg)
	{
	  sock_test_cfg_dump (&ctrl->cfg, 1 /* is_client */ );
	  vcm->dump_cfg = 0;
	}

      switch (ctrl->cfg.test)
	{
	case SOCK_TEST_TYPE_ECHO:
	  vtc_echo_client (vcm);
	  break;

	case SOCK_TEST_TYPE_UNI:
	case SOCK_TEST_TYPE_BI:
	  vtc_stream_client (vcm);
	  break;

	case SOCK_TEST_TYPE_EXIT:
	  continue;

	case SOCK_TEST_TYPE_NONE:
	default:
	  break;
	}
      switch (vcm->post_test)
	{
	case SOCK_TEST_TYPE_EXIT:
	  switch (ctrl->cfg.test)
	    {
	    case SOCK_TEST_TYPE_EXIT:
	    case SOCK_TEST_TYPE_UNI:
	    case SOCK_TEST_TYPE_BI:
	    case SOCK_TEST_TYPE_ECHO:
	      ctrl->cfg.test = SOCK_TEST_TYPE_EXIT;
	      continue;

	    case SOCK_TEST_TYPE_NONE:
	    default:
	      break;
	    }
	  break;

	case SOCK_TEST_TYPE_NONE:
	case SOCK_TEST_TYPE_ECHO:
	case SOCK_TEST_TYPE_UNI:
	case SOCK_TEST_TYPE_BI:
	default:
	  break;
	}

      memset (ctrl->txbuf, 0, ctrl->txbuf_size);
      memset (ctrl->rxbuf, 0, ctrl->rxbuf_size);

      vtc_read_user_input (ctrl);
    }

  vtc_ctrl_session_exit ();
  vppcom_session_close (ctrl->fd);
  vppcom_app_destroy ();
  free (vcm->workers);
  return 0;
}

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