X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=src%2Fvcl%2Fvcl_test_client.c;h=59286ee6725c6d9ccd7de45d15f82bf6b52cf5af;hb=c1f5a43;hp=e1a4c6b74d4c9a38dc56e7e5ac5efdebf77d0864;hpb=5c7cf1cc5358d137160be1619981e7eea9a7402f;p=vpp.git

diff --git a/src/vcl/vcl_test_client.c b/src/vcl/vcl_test_client.c
index e1a4c6b74d4..59286ee6725 100644
--- a/src/vcl/vcl_test_client.c
+++ b/src/vcl/vcl_test_client.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017 Cisco and/or its affiliates.
+ * 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:
@@ -13,10 +13,1058 @@
  * limitations under the License.
  */
 
-#define VCL_TEST
+#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>
 
-#include <vcl/vppcom.h>
-#include <vcl/sock_test_client.c>
+typedef struct
+{
+  vcl_test_session_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;
+  vcl_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;
+  vcl_test_session_t ctrl_session;
+  vcl_test_session_t *sessions;
+  uint8_t dump_cfg;
+  vcl_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 (vcl_test_session_t * ts)
+{
+  vcl_test_client_main_t *vcm = &vcl_client_main;
+  vcl_test_cfg_t *rx_cfg = (vcl_test_cfg_t *) ts->rxbuf;
+  int rx_bytes, tx_bytes;
+
+  vt_atomic_add (&ts->cfg.seq_num, 1);
+  if (ts->cfg.verbose)
+    {
+      vtinf ("(fd %d): Sending config to server.", ts->fd);
+      vcl_test_cfg_dump (&ts->cfg, 1 /* is_client */ );
+    }
+  tx_bytes = vcl_test_write (ts->fd, (uint8_t *) & ts->cfg,
+			     sizeof (ts->cfg), NULL, ts->cfg.verbose);
+  if (tx_bytes < 0)
+    {
+      vtwrn ("(fd %d): write test cfg failed (%d)!", ts->fd, tx_bytes);
+      return tx_bytes;
+    }
+
+  rx_bytes = vcl_test_read (ts->fd, (uint8_t *) ts->rxbuf,
+			    sizeof (vcl_test_cfg_t), NULL);
+  if (rx_bytes < 0)
+    return rx_bytes;
+
+  if (rx_cfg->magic != VCL_TEST_CFG_CTRL_MAGIC)
+    {
+      vtwrn ("(fd %d): Bad server reply cfg -- aborting!", ts->fd);
+      return -1;
+    }
+  if ((rx_bytes != sizeof (vcl_test_cfg_t))
+      || !vcl_test_cfg_verify (rx_cfg, &ts->cfg))
+    {
+      vtwrn ("(fd %d): Invalid config received from server!", ts->fd);
+      if (rx_bytes != sizeof (vcl_test_cfg_t))
+	{
+	  vtinf ("\tRx bytes %d != cfg size %lu", rx_bytes,
+		 sizeof (vcl_test_cfg_t));
+	}
+      else
+	{
+	  vcl_test_cfg_dump (rx_cfg, 1 /* is_client */ );
+	  vtinf ("(fd %d): Valid config sent to server.", ts->fd);
+	  vcl_test_cfg_dump (&ts->cfg, 1 /* is_client */ );
+	}
+      return -1;
+    }
+  if (ts->cfg.verbose)
+    {
+      vtinf ("(fd %d): Got config back from server.", ts->fd);
+      vcl_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;
+  vcl_test_session_t *ts;
+  uint32_t n_test_sessions;
+  int i, rv;
+
+  n_test_sessions = wrk->cfg.num_test_sessions;
+  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 (vcl_test_session_t));
+  else
+    wrk->sessions = calloc (n_test_sessions, sizeof (vcl_test_session_t));
+
+  if (!wrk->sessions)
+    {
+      vterr ("failed to alloc sessions", -errno);
+      return errno;
+    }
+
+  for (i = 0; i < n_test_sessions; i++)
+    {
+      ts = &wrk->sessions[i];
+      ts->fd = vppcom_session_create (vcm->proto, 1 /* is_nonblocking */ );
+      if (ts->fd < 0)
+	{
+	  vterr ("vppcom_session_create()", ts->fd);
+	  return ts->fd;
+	}
+
+      rv = vppcom_session_connect (ts->fd, &vcm->server_endpt);
+      if (rv < 0)
+	{
+	  vterr ("vppcom_session_connect()", rv);
+	  return rv;
+	}
+      vtinf ("Test session %d (fd %d) connected.", i, ts->fd);
+    }
+  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;
+  vcl_test_session_t *ctrl = &vcm->ctrl_session;
+  vcl_test_cfg_t *cfg = &wrk->cfg;
+  vcl_test_session_t *ts;
+  uint32_t sidx;
+  int i, j;
+
+  FD_ZERO (&wrk->wr_fdset);
+  FD_ZERO (&wrk->rd_fdset);
+
+  for (i = 0; i < cfg->num_test_sessions; i++)
+    {
+      ts = &wrk->sessions[i];
+      ts->cfg = wrk->cfg;
+      vcl_test_session_buf_alloc (ts);
+
+      switch (cfg->test)
+	{
+	case VCL_TEST_TYPE_ECHO:
+	  memcpy (ts->txbuf, ctrl->txbuf, cfg->total_bytes);
+	  break;
+	case VCL_TEST_TYPE_UNI:
+	case VCL_TEST_TYPE_BI:
+	  for (j = 0; j < ts->txbuf_size; j++)
+	    ts->txbuf[j] = j & 0xff;
+	  break;
+	}
+
+      FD_SET (vppcom_session_index (ts->fd), &wrk->wr_fdset);
+      FD_SET (vppcom_session_index (ts->fd), &wrk->rd_fdset);
+      sidx = vppcom_session_index (ts->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;
+  vcl_test_session_t *ctrl = &vcm->ctrl_session;
+  vcl_test_cfg_t *cfg = &wrk->cfg;
+  vcl_test_session_t *ts;
+  uint32_t i, n;
+  int rv, nbytes;
+
+  __wrk_index = wrk->wrk_index;
+
+  vtinf ("Initializing worker %u ...", wrk->wrk_index);
+
+  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_sessions ()", 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_sessions; n++)
+    {
+      ts = &wrk->sessions[n];
+      if (vtc_cfg_sync (ts))
+	return -1;
+      memset (&ts->stats, 0, sizeof (ts->stats));
+    }
+
+  return 0;
+}
+
+static int stats_lock = 0;
+
+static void
+vtc_accumulate_stats (vcl_test_client_worker_t * wrk,
+		      vcl_test_session_t * ctrl)
+{
+  vcl_test_session_t *ts;
+  static char buf[64];
+  int i, show_rx = 0;
+
+  while (__sync_lock_test_and_set (&stats_lock, 1))
+    ;
+
+  if (ctrl->cfg.test == VCL_TEST_TYPE_BI
+      || ctrl->cfg.test == VCL_TEST_TYPE_ECHO)
+    show_rx = 1;
+
+  for (i = 0; i < wrk->cfg.num_test_sessions; i++)
+    {
+      ts = &wrk->sessions[i];
+      ts->stats.start = ctrl->stats.start;
+
+      if (ctrl->cfg.verbose > 1)
+	{
+	  sprintf (buf, "CLIENT (fd %d) RESULTS", ts->fd);
+	  vcl_test_stats_dump (buf, &ts->stats, show_rx, 1 /* show tx */ ,
+			       ctrl->cfg.verbose);
+	}
+
+      vcl_test_stats_accumulate (&ctrl->stats, &ts->stats);
+      if (vcl_comp_tspec (&ctrl->stats.stop, &ts->stats.stop) < 0)
+	ctrl->stats.stop = ts->stats.stop;
+    }
+
+  __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;
+  vcl_test_session_t *ctrl = &vcm->ctrl_session;
+  vcl_test_session_t *ts;
+  int i, verbose = ctrl->cfg.verbose;
+
+  for (i = 0; i < wrk->cfg.num_test_sessions; i++)
+    {
+      ts = &wrk->sessions[i];
+      ts->cfg.test = VCL_TEST_TYPE_EXIT;
+
+      if (verbose)
+	{
+	  vtinf ("(fd %d): Sending exit cfg to server...", ts->fd);
+	  vcl_test_cfg_dump (&ts->cfg, 1 /* is_client */ );
+	}
+      (void) vcl_test_write (ts->fd, (uint8_t *) & ts->cfg,
+			     sizeof (ts->cfg), &ts->stats, verbose);
+    }
+  wrk->n_sessions = 0;
+}
+
+static void *
+vtc_worker_loop (void *arg)
+{
+  vcl_test_client_main_t *vcm = &vcl_client_main;
+  vcl_test_session_t *ctrl = &vcm->ctrl_session;
+  vcl_test_client_worker_t *wrk = arg;
+  uint32_t n_active_sessions, n_bytes;
+  fd_set _wfdset, *wfdset = &_wfdset;
+  fd_set _rfdset, *rfdset = &_rfdset;
+  vcl_test_session_t *ts;
+  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 != VCL_TEST_TYPE_UNI;
+  n_active_sessions = wrk->cfg.num_test_sessions;
+  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_sessions; i++)
+	{
+	  ts = &wrk->sessions[i];
+	  if (!((ts->stats.stop.tv_sec == 0) &&
+		(ts->stats.stop.tv_nsec == 0)))
+	    continue;
+
+	  if (FD_ISSET (vppcom_session_index (ts->fd), rfdset)
+	      && ts->stats.rx_bytes < ts->cfg.total_bytes)
+	    {
+	      (void) vcl_test_read (ts->fd, (uint8_t *) ts->rxbuf,
+				    ts->rxbuf_size, &ts->stats);
+	    }
+
+	  if (FD_ISSET (vppcom_session_index (ts->fd), wfdset)
+	      && ts->stats.tx_bytes < ts->cfg.total_bytes)
+	    {
+	      n_bytes = ts->cfg.txbuf_size;
+	      if (ts->cfg.test == VCL_TEST_TYPE_ECHO)
+		n_bytes = strlen (ctrl->txbuf) + 1;
+	      rv = vcl_test_write (ts->fd, (uint8_t *) ts->txbuf,
+				   n_bytes, &ts->stats, ts->cfg.verbose);
+	      if (rv < 0)
+		{
+		  vtwrn ("vppcom_test_write (%d) failed -- aborting test",
+			 ts->fd);
+		  goto exit;
+		}
+	    }
+
+	  if ((!check_rx && ts->stats.tx_bytes >= ts->cfg.total_bytes)
+	      || (check_rx && ts->stats.rx_bytes >= ts->cfg.total_bytes))
+	    {
+	      clock_gettime (CLOCK_REALTIME, &ts->stats.stop);
+	      n_active_sessions--;
+	    }
+	}
+    }
+exit:
+  vtinf ("Worker %d done ...", wrk->wrk_index);
+  if (wrk->cfg.test != VCL_TEST_TYPE_ECHO)
+    vtc_accumulate_stats (wrk, ctrl);
+  sleep (VCL_TEST_DELAY_DISCONNECT);
+  vtc_worker_sessions_exit (wrk);
+  if (wrk->wrk_index)
+    vt_atomic_add (&vcm->active_workers, -1);
+  return 0;
+}
+
+static void
+vtc_print_stats (vcl_test_session_t * ctrl)
+{
+  int is_echo = ctrl->cfg.test == VCL_TEST_TYPE_ECHO;
+  int show_rx = 0;
+  char buf[64];
+
+  if (ctrl->cfg.test == VCL_TEST_TYPE_BI
+      || ctrl->cfg.test == VCL_TEST_TYPE_ECHO)
+    show_rx = 1;
+
+  vcl_test_stats_dump ("CLIENT RESULTS", &ctrl->stats,
+		       show_rx, 1 /* show tx */ ,
+		       ctrl->cfg.verbose);
+  vcl_test_cfg_dump (&ctrl->cfg, 1 /* is_client */ );
+
+  if (ctrl->cfg.verbose)
+    {
+      vtinf ("  ctrl session info\n"
+	     VCL_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"
+	     VCL_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 == VCL_TEST_TYPE_BI ? "Bi" : "Uni");
+}
+
+static void
+vtc_echo_client (vcl_test_client_main_t * vcm)
+{
+  vcl_test_client_worker_t *wrk;
+  vcl_test_session_t *ctrl = &vcm->ctrl_session;
+  vcl_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);
+
+  /* Not relevant for echo test
+     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)
+{
+  vcl_test_session_t *ctrl = &vcm->ctrl_session;
+  vcl_test_cfg_t *cfg = &ctrl->cfg;
+  vcl_test_client_worker_t *wrk;
+  vcl_test_session_t *ts;
+  int tx_bytes, rv;
+  uint32_t i, n, sidx, n_conn, n_conn_per_wrk;
+
+  vtinf ("%s-directional Stream Test Starting!",
+	 ctrl->cfg.test == VCL_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 = ((vcl_test_cfg_t *) ctrl->rxbuf)->ctrl_handle;
+  memset (&ctrl->stats, 0, sizeof (ctrl->stats));
+
+  n_conn = cfg->num_test_sessions;
+  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_sessions = vtc_min (n_conn_per_wrk, n_conn);
+      n_conn -= wrk->cfg.num_test_sessions;
+    }
+
+  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)
+    ;
+
+  vtinf ("Sending config on ctrl session (fd %d) for stats...", ctrl->fd);
+  if (vtc_cfg_sync (ctrl))
+    {
+      vtwrn ("test cfg sync failed -- aborting!");
+      return;
+    }
+
+  vtc_print_stats (ctrl);
+
+  ctrl->cfg.test = VCL_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 VCL_TEST_TOKEN_HELP
+	  "\t\t\tDisplay help."
+	  INDENT VCL_TEST_TOKEN_EXIT
+	  "\t\t\tExit test client & server."
+	  INDENT VCL_TEST_TOKEN_SHOW_CFG
+	  "\t\t\tShow the current test cfg."
+	  INDENT VCL_TEST_TOKEN_RUN_UNI
+	  "\t\t\tRun the Uni-directional test."
+	  INDENT VCL_TEST_TOKEN_RUN_BI
+	  "\t\t\tRun the Bi-directional test."
+	  INDENT VCL_TEST_TOKEN_VERBOSE
+	  "\t\t\tToggle verbose setting."
+	  INDENT VCL_TEST_TOKEN_RXBUF_SIZE
+	  "<rxbuf size>\tRx buffer size (bytes)."
+	  INDENT VCL_TEST_TOKEN_TXBUF_SIZE
+	  "<txbuf size>\tTx buffer size (bytes)."
+	  INDENT VCL_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;
+  vcl_test_session_t *ctrl = &vcm->ctrl_session;
+  char *p = ctrl->txbuf + strlen (VCL_TEST_TOKEN_TXBUF_SIZE);
+  uint64_t txbuf_size = strtoull ((const char *) p, NULL, 10);
+
+  if (txbuf_size >= VCL_TEST_CFG_BUF_SIZE_MIN)
+    {
+      ctrl->cfg.txbuf_size = txbuf_size;
+      ctrl->cfg.total_bytes = ctrl->cfg.num_writes * ctrl->cfg.txbuf_size;
+      vcl_test_buf_alloc (&ctrl->cfg, 0 /* is_rxbuf */ ,
+			  (uint8_t **) & ctrl->txbuf, &ctrl->txbuf_size);
+      vcl_test_cfg_dump (&ctrl->cfg, 1 /* is_client */ );
+    }
+  else
+    vtwrn ("Invalid txbuf size (%lu) < minimum buf size (%u)!",
+	   txbuf_size, VCL_TEST_CFG_BUF_SIZE_MIN);
+}
+
+static void
+cfg_num_writes_set (void)
+{
+  vcl_test_client_main_t *vcm = &vcl_client_main;
+  vcl_test_session_t *ctrl = &vcm->ctrl_session;
+  char *p = ctrl->txbuf + strlen (VCL_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;
+      vcl_test_cfg_dump (&ctrl->cfg, 1 /* is_client */ );
+    }
+  else
+    {
+      vtwrn ("invalid num writes: %u", num_writes);
+    }
+}
+
+static void
+cfg_num_test_sessions_set (void)
+{
+  vcl_test_client_main_t *vcm = &vcl_client_main;
+  vcl_test_session_t *ctrl = &vcm->ctrl_session;
+  char *p = ctrl->txbuf + strlen (VCL_TEST_TOKEN_NUM_TEST_SESS);
+  uint32_t num_test_sessions = strtoul ((const char *) p, NULL, 10);
+
+  if ((num_test_sessions > 0) &&
+      (num_test_sessions <= VCL_TEST_CFG_MAX_TEST_SESS))
+    {
+      ctrl->cfg.num_test_sessions = num_test_sessions;
+      vcl_test_cfg_dump (&ctrl->cfg, 1 /* is_client */ );
+    }
+  else
+    {
+      vtwrn ("invalid num test sessions: %u, (%d max)",
+	     num_test_sessions, VCL_TEST_CFG_MAX_TEST_SESS);
+    }
+}
+
+static void
+cfg_rxbuf_size_set (void)
+{
+  vcl_test_client_main_t *vcm = &vcl_client_main;
+  vcl_test_session_t *ctrl = &vcm->ctrl_session;
+  char *p = ctrl->txbuf + strlen (VCL_TEST_TOKEN_RXBUF_SIZE);
+  uint64_t rxbuf_size = strtoull ((const char *) p, NULL, 10);
+
+  if (rxbuf_size >= VCL_TEST_CFG_BUF_SIZE_MIN)
+    {
+      ctrl->cfg.rxbuf_size = rxbuf_size;
+      vcl_test_buf_alloc (&ctrl->cfg, 1 /* is_rxbuf */ ,
+			  (uint8_t **) & ctrl->rxbuf, &ctrl->rxbuf_size);
+      vcl_test_cfg_dump (&ctrl->cfg, 1 /* is_client */ );
+    }
+  else
+    vtwrn ("Invalid rxbuf size (%lu) < minimum buf size (%u)!",
+	   rxbuf_size, VCL_TEST_CFG_BUF_SIZE_MIN);
+}
+
+static void
+cfg_verbose_toggle (void)
+{
+  vcl_test_client_main_t *vcm = &vcl_client_main;
+  vcl_test_session_t *ctrl = &vcm->ctrl_session;
+
+  ctrl->cfg.verbose = ctrl->cfg.verbose ? 0 : 1;
+  vcl_test_cfg_dump (&ctrl->cfg, 1 /* is_client */ );
+
+}
+
+static vcl_test_t
+parse_input ()
+{
+  vcl_test_client_main_t *vcm = &vcl_client_main;
+  vcl_test_session_t *ctrl = &vcm->ctrl_session;
+  vcl_test_t rv = VCL_TEST_TYPE_NONE;
+
+  if (!strncmp (VCL_TEST_TOKEN_EXIT, ctrl->txbuf,
+		strlen (VCL_TEST_TOKEN_EXIT)))
+    rv = VCL_TEST_TYPE_EXIT;
+
+  else if (!strncmp (VCL_TEST_TOKEN_HELP, ctrl->txbuf,
+		     strlen (VCL_TEST_TOKEN_HELP)))
+    dump_help ();
+
+  else if (!strncmp (VCL_TEST_TOKEN_SHOW_CFG, ctrl->txbuf,
+		     strlen (VCL_TEST_TOKEN_SHOW_CFG)))
+    vcm->dump_cfg = 1;
+
+  else if (!strncmp (VCL_TEST_TOKEN_VERBOSE, ctrl->txbuf,
+		     strlen (VCL_TEST_TOKEN_VERBOSE)))
+    cfg_verbose_toggle ();
+
+  else if (!strncmp (VCL_TEST_TOKEN_TXBUF_SIZE, ctrl->txbuf,
+		     strlen (VCL_TEST_TOKEN_TXBUF_SIZE)))
+    cfg_txbuf_size_set ();
+
+  else if (!strncmp (VCL_TEST_TOKEN_NUM_TEST_SESS, ctrl->txbuf,
+		     strlen (VCL_TEST_TOKEN_NUM_TEST_SESS)))
+    cfg_num_test_sessions_set ();
+
+  else if (!strncmp (VCL_TEST_TOKEN_NUM_WRITES, ctrl->txbuf,
+		     strlen (VCL_TEST_TOKEN_NUM_WRITES)))
+    cfg_num_writes_set ();
+
+  else if (!strncmp (VCL_TEST_TOKEN_RXBUF_SIZE, ctrl->txbuf,
+		     strlen (VCL_TEST_TOKEN_RXBUF_SIZE)))
+    cfg_rxbuf_size_set ();
+
+  else if (!strncmp (VCL_TEST_TOKEN_RUN_UNI, ctrl->txbuf,
+		     strlen (VCL_TEST_TOKEN_RUN_UNI)))
+    rv = ctrl->cfg.test = VCL_TEST_TYPE_UNI;
+
+  else if (!strncmp (VCL_TEST_TOKEN_RUN_BI, ctrl->txbuf,
+		     strlen (VCL_TEST_TOKEN_RUN_BI)))
+    rv = ctrl->cfg.test = VCL_TEST_TYPE_BI;
+
+  else
+    rv = VCL_TEST_TYPE_ECHO;
+
+  return rv;
+}
+
+void
+print_usage_and_exit (void)
+{
+  fprintf (stderr,
+	   "vcl_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)
+{
+  vcl_test_session_t *ctrl = &vcm->ctrl_session;
+  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_sessions) != 1)
+	  if (sscanf (optarg, "%u", &ctrl->cfg.num_test_sessions) != 1)
+	    {
+	      vtwrn ("Invalid value for option -%c!", c);
+	      print_usage_and_exit ();
+	    }
+	if (!ctrl->cfg.num_test_sessions ||
+	    (ctrl->cfg.num_test_sessions > FD_SETSIZE))
+	  {
+	    vtwrn ("Invalid number of sessions (%d) specified for option -%c!"
+		   "\n       Valid range is 1 - %d",
+		   ctrl->cfg.num_test_sessions, 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 = VCL_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 = VCL_TEST_TYPE_ECHO;
+	break;
+
+      case 'I':
+	if (sscanf (optarg, "0x%x", &ctrl->cfg.num_test_sessions) != 1)
+	  if (sscanf (optarg, "%d", &ctrl->cfg.num_test_sessions) != 1)
+	    {
+	      vtwrn ("Invalid value for option -%c!", c);
+	      print_usage_and_exit ();
+	    }
+	if (ctrl->cfg.num_test_sessions > VCL_TEST_CFG_MAX_TEST_SESS)
+	  {
+	    vtwrn ("value greater than max number test sessions (%d)!",
+		   VCL_TEST_CFG_MAX_TEST_SESS);
+	    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 >= VCL_TEST_CFG_BUF_SIZE_MIN)
+	  {
+	    ctrl->rxbuf_size = ctrl->cfg.rxbuf_size;
+	    vcl_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, VCL_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 >= VCL_TEST_CFG_BUF_SIZE_MIN)
+	  {
+	    ctrl->txbuf_size = ctrl->cfg.txbuf_size;
+	    vcl_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, VCL_TEST_CFG_BUF_SIZE_MIN);
+	    print_usage_and_exit ();
+	  }
+	break;
+
+      case 'U':
+	ctrl->cfg.test = VCL_TEST_TYPE_UNI;
+	break;
+
+      case 'B':
+	ctrl->cfg.test = VCL_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 (vcl_test_session_t * ctrl)
+{
+  printf ("\nType some characters and hit <return>\n"
+	  "('" VCL_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;
+  vcl_test_session_t *ctrl = &vcm->ctrl_session;
+  int verbose = ctrl->cfg.verbose;
+
+  ctrl->cfg.test = VCL_TEST_TYPE_EXIT;
+  if (verbose)
+    {
+      vtinf ("(fd %d): Sending exit cfg to server...", ctrl->fd);
+      vcl_test_cfg_dump (&ctrl->cfg, 1 /* is_client */ );
+    }
+  (void) vcl_test_write (ctrl->fd, (uint8_t *) & ctrl->cfg,
+			 sizeof (ctrl->cfg), &ctrl->stats, verbose);
+  sleep (1);
+}
+
+int
+main (int argc, char **argv)
+{
+  vcl_test_client_main_t *vcm = &vcl_client_main;
+  vcl_test_session_t *ctrl = &vcm->ctrl_session;
+  int rv, errno_val;
+
+  vcm->n_workers = 1;
+  vcl_test_cfg_init (&ctrl->cfg);
+  vcl_test_session_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 ("Control session (fd %d) connected.", ctrl->fd);
+
+  rv = vtc_cfg_sync (ctrl);
+  if (rv)
+    vtfail ("vtc_cfg_sync()", rv);
+
+  ctrl->cfg.ctrl_handle = ((vcl_test_cfg_t *) ctrl->rxbuf)->ctrl_handle;
+  memset (&ctrl->stats, 0, sizeof (ctrl->stats));
+
+  while (ctrl->cfg.test != VCL_TEST_TYPE_EXIT)
+    {
+      if (vcm->dump_cfg)
+	{
+	  vcl_test_cfg_dump (&ctrl->cfg, 1 /* is_client */ );
+	  vcm->dump_cfg = 0;
+	}
+
+      switch (ctrl->cfg.test)
+	{
+	case VCL_TEST_TYPE_ECHO:
+	  vtc_echo_client (vcm);
+	  break;
+
+	case VCL_TEST_TYPE_UNI:
+	case VCL_TEST_TYPE_BI:
+	  vtc_stream_client (vcm);
+	  break;
+
+	case VCL_TEST_TYPE_EXIT:
+	  continue;
+
+	case VCL_TEST_TYPE_NONE:
+	default:
+	  break;
+	}
+      switch (vcm->post_test)
+	{
+	case VCL_TEST_TYPE_EXIT:
+	  switch (ctrl->cfg.test)
+	    {
+	    case VCL_TEST_TYPE_EXIT:
+	    case VCL_TEST_TYPE_UNI:
+	    case VCL_TEST_TYPE_BI:
+	    case VCL_TEST_TYPE_ECHO:
+	      ctrl->cfg.test = VCL_TEST_TYPE_EXIT;
+	      continue;
+
+	    case VCL_TEST_TYPE_NONE:
+	    default:
+	      break;
+	    }
+	  break;
+
+	case VCL_TEST_TYPE_NONE:
+	case VCL_TEST_TYPE_ECHO:
+	case VCL_TEST_TYPE_UNI:
+	case VCL_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