hsa: move vcl test apps to hsa

Type: refactor

Change-Id: I352975585c1091bfc5b85d7f8fe985f9059820a7
Signed-off-by: Florin Coras <fcoras@cisco.com>

1 files changed, 1015 insertions, 0 deletions

diff --git a/src/plugins/hs_apps/vcl/sock_test_server.c b/src/plugins/hs_apps/vcl/sock_test_server.c
new file mode 100644
index 00000000000..59dae179cd8
--- /dev/null
+++ b/src/plugins/hs_apps/vcl/sock_test_server.c
@@ -0,0 +1,1015 @@
+/*
+ * Copyright (c) 2017-2019 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 <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 <hs_apps/vcl/sock_test.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+
+#define SOCK_SERVER_USE_EPOLL 1
+#define VPPCOM_SESSION_ATTR_UNIT_TEST 0
+
+#if SOCK_SERVER_USE_EPOLL
+#include <sys/epoll.h>
+#if !defined(VCL_TEST)
+#include <sys/un.h>
+#endif
+#endif
+
+#ifdef VCL_TEST
+#if VPPCOM_SESSION_ATTR_UNIT_TEST
+#define BUFLEN  sizeof (uint64_t) * 16
+uint64_t buffer[16];
+uint32_t buflen = BUFLEN;
+uint32_t *flags = (uint32_t *) buffer;
+#endif
+#endif
+
+typedef struct
+{
+  uint8_t is_alloc;
+  int fd;
+  uint8_t *buf;
+  uint32_t buf_size;
+  vcl_test_cfg_t cfg;
+  vcl_test_stats_t stats;
+#ifdef VCL_TEST
+  vppcom_endpt_t endpt;
+  uint8_t ip[16];
+#endif
+} sock_server_conn_t;
+
+typedef struct
+{
+  uint32_t port;
+  uint32_t address_ip6;
+  uint32_t transport_udp;
+} sock_server_cfg_t;
+
+#define SOCK_SERVER_MAX_TEST_CONN  10
+#define SOCK_SERVER_MAX_EPOLL_EVENTS 10
+typedef struct
+{
+  int listen_fd;
+  sock_server_cfg_t cfg;
+#if SOCK_SERVER_USE_EPOLL
+  int epfd;
+  struct epoll_event listen_ev;
+  struct epoll_event wait_events[SOCK_SERVER_MAX_EPOLL_EVENTS];
+#if !defined (VCL_TEST)
+  int af_unix_listen_fd;
+  int af_unix_fd;
+  struct epoll_event af_unix_listen_ev;
+  struct sockaddr_un serveraddr;
+  uint32_t af_unix_xacts;
+#endif
+#endif
+  size_t num_conn;
+  size_t conn_pool_size;
+  sock_server_conn_t *conn_pool;
+  int nfds;
+  fd_set rd_fdset;
+  fd_set wr_fdset;
+  struct timeval timeout;
+} sock_server_main_t;
+
+sock_server_main_t sock_server_main;
+
+#if ! SOCK_SERVER_USE_EPOLL
+static inline int
+get_nfds (void)
+{
+  sock_server_main_t *ssm = &sock_server_main;
+  int i, nfds;
+
+  for (nfds = i = 0; i < FD_SETSIZE; i++)
+    {
+      if (FD_ISSET (i, &ssm->rd_fdset) || FD_ISSET (i, &ssm->wr_fdset))
+	nfds = i + 1;
+    }
+  return nfds;
+}
+
+static inline void
+conn_fdset_set (sock_server_conn_t * conn, fd_set * fdset)
+{
+  sock_server_main_t *ssm = &sock_server_main;
+
+  FD_SET (conn->fd, fdset);
+  ssm->nfds = get_nfds ();
+}
+
+static inline void
+conn_fdset_clr (sock_server_conn_t * conn, fd_set * fdset)
+{
+  sock_server_main_t *ssm = &sock_server_main;
+
+  FD_CLR (conn->fd, fdset);
+  ssm->nfds = get_nfds ();
+}
+#endif
+
+static inline void
+conn_pool_expand (size_t expand_size)
+{
+  sock_server_main_t *ssm = &sock_server_main;
+  sock_server_conn_t *conn_pool;
+  size_t new_size = ssm->conn_pool_size + expand_size;
+  int i;
+
+  conn_pool = realloc (ssm->conn_pool, new_size * sizeof (*ssm->conn_pool));
+  if (conn_pool)
+    {
+      for (i = ssm->conn_pool_size; i < new_size; i++)
+	{
+	  sock_server_conn_t *conn = &conn_pool[i];
+	  memset (conn, 0, sizeof (*conn));
+	  vcl_test_cfg_init (&conn->cfg);
+	  vcl_test_buf_alloc (&conn->cfg, 1 /* is_rxbuf */ ,
+			      &conn->buf, &conn->buf_size);
+	  conn->cfg.txbuf_size = conn->cfg.rxbuf_size;
+	}
+
+      ssm->conn_pool = conn_pool;
+      ssm->conn_pool_size = new_size;
+    }
+  else
+    {
+      int errno_val = errno;
+      perror ("ERROR in conn_pool_expand()");
+      fprintf (stderr, "SERVER: ERROR: Memory allocation "
+	       "failed (errno = %d)!\n", errno_val);
+    }
+}
+
+static inline sock_server_conn_t *
+conn_pool_alloc (void)
+{
+  sock_server_main_t *ssm = &sock_server_main;
+  int i;
+
+  for (i = 0; i < ssm->conn_pool_size; i++)
+    {
+      if (!ssm->conn_pool[i].is_alloc)
+	{
+#ifdef VCL_TEST
+	  ssm->conn_pool[i].endpt.ip = ssm->conn_pool[i].ip;
+#endif
+	  ssm->conn_pool[i].is_alloc = 1;
+	  return (&ssm->conn_pool[i]);
+	}
+    }
+
+  return 0;
+}
+
+static inline void
+conn_pool_free (sock_server_conn_t * conn)
+{
+#if ! SOCK_SERVER_USE_EPOLL
+  sock_server_main_t *ssm = &sock_server_main;
+
+  conn_fdset_clr (conn, &ssm->rd_fdset);
+  conn_fdset_clr (conn, &ssm->wr_fdset);
+#endif
+  conn->fd = 0;
+  conn->is_alloc = 0;
+}
+
+static inline void
+sync_config_and_reply (sock_server_conn_t * conn, vcl_test_cfg_t * rx_cfg)
+{
+  conn->cfg = *rx_cfg;
+  vcl_test_buf_alloc (&conn->cfg, 1 /* is_rxbuf */ ,
+		      &conn->buf, &conn->buf_size);
+  conn->cfg.txbuf_size = conn->cfg.rxbuf_size;
+
+  if (conn->cfg.verbose)
+    {
+      printf ("\nSERVER (fd %d): Replying to cfg message!\n", conn->fd);
+      vcl_test_cfg_dump (&conn->cfg, 0 /* is_client */ );
+    }
+  (void) sock_test_write (conn->fd, (uint8_t *) & conn->cfg,
+			  sizeof (conn->cfg), NULL, conn->cfg.verbose);
+}
+
+static void
+stream_test_server_start_stop (sock_server_conn_t * conn,
+			       vcl_test_cfg_t * rx_cfg)
+{
+  sock_server_main_t *ssm = &sock_server_main;
+  int client_fd = conn->fd;
+  vcl_test_t test = rx_cfg->test;
+
+  if (rx_cfg->ctrl_handle == conn->fd)
+    {
+      int i;
+      clock_gettime (CLOCK_REALTIME, &conn->stats.stop);
+
+      for (i = 0; i < ssm->conn_pool_size; i++)
+	{
+	  sock_server_conn_t *tc = &ssm->conn_pool[i];
+
+	  if (tc->cfg.ctrl_handle == conn->fd)
+	    {
+	      vcl_test_stats_accumulate (&conn->stats, &tc->stats);
+
+	      if (conn->cfg.verbose)
+		{
+		  static char buf[64];
+
+		  sprintf (buf, "SERVER (fd %d) RESULTS", tc->fd);
+		  vcl_test_stats_dump (buf, &tc->stats, 1 /* show_rx */ ,
+				       test == VCL_TEST_TYPE_BI
+				       /* show tx */ ,
+				       conn->cfg.verbose);
+		}
+	    }
+	}
+
+      vcl_test_stats_dump ("SERVER RESULTS", &conn->stats, 1 /* show_rx */ ,
+			   (test == VCL_TEST_TYPE_BI) /* show_tx */ ,
+			   conn->cfg.verbose);
+      vcl_test_cfg_dump (&conn->cfg, 0 /* is_client */ );
+      if (conn->cfg.verbose)
+	{
+	  printf ("  sock server main\n"
+		  VCL_TEST_SEPARATOR_STRING
+		  "       buf:  %p\n"
+		  "  buf size:  %u (0x%08x)\n"
+		  VCL_TEST_SEPARATOR_STRING,
+		  conn->buf, conn->buf_size, conn->buf_size);
+	}
+
+      sync_config_and_reply (conn, rx_cfg);
+      printf ("\nSERVER (fd %d): %s-directional Stream Test Complete!\n"
+	      SOCK_TEST_BANNER_STRING "\n", conn->fd,
+	      test == VCL_TEST_TYPE_BI ? "Bi" : "Uni");
+    }
+  else
+    {
+      printf ("\n" SOCK_TEST_BANNER_STRING
+	      "SERVER (fd %d): %s-directional Stream Test!\n"
+	      "  Sending client the test cfg to start streaming data...\n",
+	      client_fd, test == VCL_TEST_TYPE_BI ? "Bi" : "Uni");
+
+      rx_cfg->ctrl_handle = (rx_cfg->ctrl_handle == ~0) ? conn->fd :
+	rx_cfg->ctrl_handle;
+
+      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
+stream_test_server (sock_server_conn_t * conn, int rx_bytes)
+{
+  int client_fd = conn->fd;
+  vcl_test_t test = conn->cfg.test;
+
+  if (test == VCL_TEST_TYPE_BI)
+    (void) sock_test_write (client_fd, conn->buf, rx_bytes, &conn->stats,
+			    conn->cfg.verbose);
+
+  if (conn->stats.rx_bytes >= conn->cfg.total_bytes)
+    {
+      clock_gettime (CLOCK_REALTIME, &conn->stats.stop);
+    }
+}
+
+#if SOCK_SERVER_USE_EPOLL && !defined (VCL_TEST)
+static inline void
+af_unix_echo (void)
+{
+  sock_server_main_t *ssm = &sock_server_main;
+  int af_unix_client_fd;
+  int rv;
+  int errno_val;
+  uint8_t buffer[256];
+  size_t nbytes = strlen (SOCK_TEST_MIXED_EPOLL_DATA) + 1;
+
+#if HAVE_ACCEPT4
+  af_unix_client_fd = accept4 (ssm->af_unix_listen_fd,
+			       (struct sockaddr *) NULL, NULL, NULL);
+#else
+  af_unix_client_fd = accept (ssm->af_unix_listen_fd,
+			      (struct sockaddr *) NULL, NULL);
+#endif
+  if (af_unix_client_fd < 0)
+    {
+      errno_val = errno;
+      perror ("ERROR in af_unix_accept()");
+      fprintf (stderr, "SERVER: ERROR: accept failed "
+	       "(errno = %d)!\n", errno_val);
+      return;
+    }
+
+  printf ("SERVER: Got an AF_UNIX connection -- fd = %d (0x%08x)!\n",
+	  af_unix_client_fd, af_unix_client_fd);
+
+  memset (buffer, 0, sizeof (buffer));
+
+  rv = read (af_unix_client_fd, buffer, nbytes);
+  if (rv < 0)
+    {
+      errno_val = errno;
+      perror ("ERROR in af_unix_echo(): read() failed");
+      fprintf (stderr, "SERVER: ERROR: read(af_unix_client_fd %d (0x%x), "
+	       "\"%s\", nbytes %lu) failed (errno = %d)!\n",
+	       af_unix_client_fd, af_unix_client_fd, buffer, nbytes,
+	       errno_val);
+      goto done;
+    }
+
+  printf ("SERVER (AF_UNIX): RX (%d bytes) - '%s'\n", rv, buffer);
+
+  if (!strncmp (SOCK_TEST_MIXED_EPOLL_DATA, (const char *) buffer, nbytes))
+    {
+      rv = write (af_unix_client_fd, buffer, nbytes);
+      if (rv < 0)
+	{
+	  errno_val = errno;
+	  perror ("ERROR in af_unix_echo(): write() failed");
+	  fprintf (stderr,
+		   "SERVER: ERROR: write(af_unix_client_fd %d (0x%x), "
+		   "\"%s\", nbytes %ld) failed (errno = %d)!\n",
+		   af_unix_client_fd, af_unix_client_fd, buffer, nbytes,
+		   errno_val);
+	  goto done;
+	}
+      printf ("SERVER (AF_UNIX): TX (%d bytes) - '%s'\n", rv, buffer);
+      ssm->af_unix_xacts++;
+    }
+done:
+  close (af_unix_client_fd);
+}
+
+#endif
+
+static inline void
+new_client (void)
+{
+  sock_server_main_t *ssm = &sock_server_main;
+  int client_fd;
+  sock_server_conn_t *conn;
+
+  if (ssm->conn_pool_size < (ssm->num_conn + SOCK_SERVER_MAX_TEST_CONN + 1))
+    conn_pool_expand (SOCK_SERVER_MAX_TEST_CONN + 1);
+
+  conn = conn_pool_alloc ();
+  if (!conn)
+    {
+      fprintf (stderr, "\nSERVER: ERROR: No free connections!\n");
+      return;
+    }
+
+#ifdef VCL_TEST
+  client_fd = vppcom_session_accept (ssm->listen_fd, &conn->endpt, 0);
+  if (client_fd < 0)
+    errno = -client_fd;
+#elif HAVE_ACCEPT4
+  client_fd = accept4 (ssm->listen_fd, (struct sockaddr *) NULL, NULL, NULL);
+#else
+  client_fd = accept (ssm->listen_fd, (struct sockaddr *) NULL, NULL);
+#endif
+  if (client_fd < 0)
+    {
+      int errno_val;
+      errno_val = errno;
+      perror ("ERROR in new_client()");
+      fprintf (stderr, "SERVER: ERROR: accept failed "
+	       "(errno = %d)!\n", errno_val);
+      return;
+    }
+
+  printf ("SERVER: Got a connection -- fd = %d (0x%08x)!\n",
+	  client_fd, client_fd);
+
+  conn->fd = client_fd;
+
+#if ! SOCK_SERVER_USE_EPOLL
+  conn_fdset_set (conn, &ssm->rd_fdset);
+  ssm->nfds++;
+#else
+  {
+    struct epoll_event ev;
+    int rv;
+
+    ev.events = EPOLLIN;
+    ev.data.u64 = conn - ssm->conn_pool;
+#ifdef VCL_TEST
+    rv = vppcom_epoll_ctl (ssm->epfd, EPOLL_CTL_ADD, client_fd, &ev);
+    if (rv)
+      errno = -rv;
+#else
+    rv = epoll_ctl (ssm->epfd, EPOLL_CTL_ADD, client_fd, &ev);
+#endif
+    if (rv < 0)
+      {
+	int errno_val;
+	errno_val = errno;
+	perror ("ERROR in new_client()");
+	fprintf (stderr, "SERVER: ERROR: epoll_ctl failed (errno = %d)!\n",
+		 errno_val);
+      }
+    else
+      ssm->nfds++;
+  }
+#endif
+}
+
+void
+print_usage_and_exit (void)
+{
+  fprintf (stderr,
+	   "sock_test_server [OPTIONS] <port>\n"
+	   "  OPTIONS\n"
+	   "  -h               Print this message and exit.\n"
+	   "  -6               Use IPv6\n"
+	   "  -u               Use UDP transport layer\n");
+  exit (1);
+}
+
+int
+main (int argc, char **argv)
+{
+  sock_server_main_t *ssm = &sock_server_main;
+  int client_fd, rv, main_rv = 0;
+  int tx_bytes, rx_bytes, nbytes;
+  sock_server_conn_t *conn;
+  vcl_test_cfg_t *rx_cfg;
+  uint32_t xtra = 0;
+  uint64_t xtra_bytes = 0;
+  struct sockaddr_storage servaddr;
+  int errno_val;
+  int c, v, i;
+  uint16_t port = VCL_TEST_SERVER_PORT;
+#if ! SOCK_SERVER_USE_EPOLL
+  fd_set _rfdset, *rfdset = &_rfdset;
+#endif
+#ifdef VCL_TEST
+  vppcom_endpt_t endpt;
+#else
+  uint32_t servaddr_size;
+#if ! SOCK_SERVER_USE_EPOLL
+  fd_set _wfdset, *wfdset = &_wfdset;
+#endif
+#endif
+
+  opterr = 0;
+  while ((c = getopt (argc, argv, "6D")) != -1)
+    switch (c)
+      {
+      case '6':
+	ssm->cfg.address_ip6 = 1;
+	break;
+
+      case 'D':
+	ssm->cfg.transport_udp = 1;
+	break;
+
+      case '?':
+	switch (optopt)
+	  {
+	  default:
+	    if (isprint (optopt))
+	      fprintf (stderr, "SERVER: ERROR: Unknown "
+		       "option `-%c'.\n", optopt);
+	    else
+	      fprintf (stderr, "SERVER: ERROR: Unknown "
+		       "option character `\\x%x'.\n", optopt);
+	  }
+	/* fall thru */
+      case 'h':
+      default:
+	print_usage_and_exit ();
+      }
+
+  if (argc < (optind + 1))
+    {
+      fprintf (stderr, "SERVER: ERROR: Insufficient number of arguments!\n");
+      print_usage_and_exit ();
+    }
+
+  if (sscanf (argv[optind], "%d", &v) == 1)
+    port = (uint16_t) v;
+  else
+    {
+      fprintf (stderr, "SERVER: ERROR: Invalid port (%s)!\n", argv[optind]);
+      print_usage_and_exit ();
+    }
+
+  conn_pool_expand (SOCK_SERVER_MAX_TEST_CONN + 1);
+
+#ifdef VCL_TEST
+  rv = vppcom_app_create ("vcl_test_server");
+  if (rv)
+    {
+      errno = -rv;
+      ssm->listen_fd = -1;
+    }
+  else
+    {
+      ssm->listen_fd = vppcom_session_create (ssm->cfg.transport_udp ?
+					      VPPCOM_PROTO_UDP :
+					      VPPCOM_PROTO_TCP,
+					      0 /* is_nonblocking */ );
+    }
+#else
+  ssm->listen_fd = socket (ssm->cfg.address_ip6 ? AF_INET6 : AF_INET,
+			   ssm->cfg.transport_udp ? SOCK_DGRAM : SOCK_STREAM,
+			   0);
+#if SOCK_SERVER_USE_EPOLL && !defined (VCL_TEST)
+  unlink ((const char *) SOCK_TEST_AF_UNIX_FILENAME);
+  ssm->af_unix_listen_fd = socket (AF_UNIX, SOCK_STREAM, 0);
+  if (ssm->af_unix_listen_fd < 0)
+    {
+      errno_val = errno;
+      perror ("ERROR in main(): socket(AF_UNIX) failed");
+      fprintf (stderr,
+	       "SERVER: ERROR: socket(AF_UNIX, SOCK_STREAM, 0) failed "
+	       "(errno = %d)!\n", errno_val);
+      return ssm->af_unix_listen_fd;
+    }
+
+  memset (&ssm->serveraddr, 0, sizeof (ssm->serveraddr));
+  ssm->serveraddr.sun_family = AF_UNIX;
+  strcpy (ssm->serveraddr.sun_path, SOCK_TEST_AF_UNIX_FILENAME);
+
+  rv = bind (ssm->af_unix_listen_fd, (struct sockaddr *) &ssm->serveraddr,
+	     SUN_LEN (&ssm->serveraddr));
+  if (rv < 0)
+    {
+      errno_val = errno;
+      perror ("ERROR in main(): bind(SOCK_TEST_AF_UNIX_FILENAME) failed");
+      fprintf (stderr, "SERVER: ERROR: bind() fd %d, \"%s\": "
+	       "failed (errno = %d)!\n", ssm->af_unix_listen_fd,
+	       SOCK_TEST_AF_UNIX_FILENAME, errno_val);
+      close (ssm->af_unix_listen_fd);
+      unlink ((const char *) SOCK_TEST_AF_UNIX_FILENAME);
+      return rv;
+    }
+
+  rv = listen (ssm->af_unix_listen_fd, 10);
+  if (rv < 0)
+    {
+      errno_val = errno;
+      perror ("ERROR in main(): listen(AF_UNIX) failed");
+      fprintf (stderr, "SERVER: ERROR: listen() fd %d, \"%s\": "
+	       "failed (errno = %d)!\n", ssm->af_unix_listen_fd,
+	       SOCK_TEST_AF_UNIX_FILENAME, errno_val);
+      close (ssm->af_unix_listen_fd);
+      unlink ((const char *) SOCK_TEST_AF_UNIX_FILENAME);
+      return rv;
+    }
+#endif /* SOCK_SERVER_USE_EPOLL */
+#endif
+  if (ssm->listen_fd < 0)
+    {
+      errno_val = errno;
+      perror ("ERROR in main()");
+      fprintf (stderr, "SERVER: ERROR: socket() failed "
+	       "(errno = %d)!\n", errno_val);
+      return ssm->listen_fd;
+    }
+
+  memset (&servaddr, 0, sizeof (servaddr));
+
+  if (ssm->cfg.address_ip6)
+    {
+      struct sockaddr_in6 *server_addr = (struct sockaddr_in6 *) &servaddr;
+#ifndef VCL_TEST
+      servaddr_size = sizeof (*server_addr);
+#endif
+      server_addr->sin6_family = AF_INET6;
+      server_addr->sin6_addr = in6addr_any;
+      server_addr->sin6_port = htons (port);
+    }
+  else
+    {
+      struct sockaddr_in *server_addr = (struct sockaddr_in *) &servaddr;
+#ifndef VCL_TEST
+      servaddr_size = sizeof (*server_addr);
+#endif
+      server_addr->sin_family = AF_INET;
+      server_addr->sin_addr.s_addr = htonl (INADDR_ANY);
+      server_addr->sin_port = htons (port);
+    }
+
+#ifdef VCL_TEST
+  if (ssm->cfg.address_ip6)
+    {
+      struct sockaddr_in6 *server_addr = (struct sockaddr_in6 *) &servaddr;
+      endpt.is_ip4 = 0;
+      endpt.ip = (uint8_t *) & server_addr->sin6_addr;
+      endpt.port = (uint16_t) server_addr->sin6_port;
+    }
+  else
+    {
+      struct sockaddr_in *server_addr = (struct sockaddr_in *) &servaddr;
+      endpt.is_ip4 = 1;
+      endpt.ip = (uint8_t *) & server_addr->sin_addr;
+      endpt.port = (uint16_t) server_addr->sin_port;
+    }
+
+  rv = vppcom_session_bind (ssm->listen_fd, &endpt);
+  if (rv)
+    {
+      errno = -rv;
+      rv = -1;
+    }
+#else
+  rv = bind (ssm->listen_fd, (struct sockaddr *) &servaddr, servaddr_size);
+#endif
+  if (rv < 0)
+    {
+      errno_val = errno;
+      perror ("ERROR in main()");
+      fprintf (stderr, "SERVER: ERROR: bind failed (errno = %d)!\n",
+	       errno_val);
+      return rv;
+    }
+  if (fcntl (ssm->listen_fd, F_SETFL, O_NONBLOCK) < 0)
+    {
+      errno_val = errno;
+      perror ("ERROR in main()");
+      fprintf (stderr, "SERVER: ERROR: fcntl failed (errno = %d)!\n",
+	       errno_val);
+      return rv;
+    }
+
+#ifdef VCL_TEST
+  rv = vppcom_session_listen (ssm->listen_fd, 10);
+  if (rv)
+    {
+      errno = -rv;
+      rv = -1;
+    }
+#else
+  rv = listen (ssm->listen_fd, 10);
+#endif
+  if (rv < 0)
+    {
+      errno_val = errno;
+      perror ("ERROR in main()");
+      fprintf (stderr, "SERVER: ERROR: listen failed "
+	       "(errno = %d)!\n", errno_val);
+      return rv;
+    }
+
+#if ! SOCK_SERVER_USE_EPOLL
+
+  FD_ZERO (&ssm->wr_fdset);
+  FD_ZERO (&ssm->rd_fdset);
+
+  FD_SET (ssm->listen_fd, &ssm->rd_fdset);
+  ssm->nfds = ssm->listen_fd + 1;
+
+#else
+#ifdef VCL_TEST
+  ssm->epfd = vppcom_epoll_create ();
+  if (ssm->epfd < 0)
+    errno = -ssm->epfd;
+#else
+  ssm->epfd = epoll_create (1);
+#endif
+  if (ssm->epfd < 0)
+    {
+      errno_val = errno;
+      perror ("ERROR in main()");
+      fprintf (stderr, "SERVER: ERROR: epoll_create failed (errno = %d)!\n",
+	       errno_val);
+      return ssm->epfd;
+    }
+
+  ssm->listen_ev.events = EPOLLIN;
+  ssm->listen_ev.data.u32 = ~0;
+#ifdef VCL_TEST
+  rv = vppcom_epoll_ctl (ssm->epfd, EPOLL_CTL_ADD, ssm->listen_fd,
+			 &ssm->listen_ev);
+  if (rv < 0)
+    errno = -rv;
+#else
+  ssm->af_unix_listen_ev.events = EPOLLIN;
+  ssm->af_unix_listen_ev.data.u32 = SOCK_TEST_AF_UNIX_ACCEPT_DATA;
+  rv = epoll_ctl (ssm->epfd, EPOLL_CTL_ADD, ssm->af_unix_listen_fd,
+		  &ssm->af_unix_listen_ev);
+  if (rv < 0)
+    {
+      errno_val = errno;
+      perror ("ERROR in main(): mixed epoll_ctl(EPOLL_CTL_ADD)");
+      fprintf (stderr, "SERVER: ERROR: mixed epoll_ctl(epfd %d (0x%x), "
+	       "EPOLL_CTL_ADD, af_unix_listen_fd %d (0x%x), EPOLLIN) failed "
+	       "(errno = %d)!\n", ssm->epfd, ssm->epfd,
+	       ssm->af_unix_listen_fd, ssm->af_unix_listen_fd, errno_val);
+      close (ssm->af_unix_listen_fd);
+      unlink ((const char *) SOCK_TEST_AF_UNIX_FILENAME);
+      return rv;
+    }
+
+  rv = epoll_ctl (ssm->epfd, EPOLL_CTL_ADD, ssm->listen_fd, &ssm->listen_ev);
+#endif
+  if (rv < 0)
+    {
+      errno_val = errno;
+      perror ("ERROR in main()");
+      fprintf (stderr, "SERVER: ERROR: epoll_ctl failed "
+	       "(errno = %d)!\n", errno_val);
+      return rv;
+    }
+#endif
+
+  printf ("\nSERVER: Waiting for a client to connect on port %d...\n", port);
+
+  while (1)
+    {
+#if ! SOCK_SERVER_USE_EPOLL
+      _rfdset = ssm->rd_fdset;
+
+#ifdef VCL_TEST
+      rv = vppcom_select (ssm->nfds, (unsigned long *) rfdset, NULL, NULL, 0);
+#else
+      {
+	struct timeval timeout;
+	timeout = ssm->timeout;
+	_wfdset = ssm->wr_fdset;
+	rv = select (ssm->nfds, rfdset, wfdset, NULL, &timeout);
+      }
+#endif
+      if (rv < 0)
+	{
+	  perror ("select()");
+	  fprintf (stderr, "\nSERVER: ERROR: select() failed -- aborting!\n");
+	  main_rv = -1;
+	  goto done;
+	}
+      else if (rv == 0)
+	continue;
+
+      if (FD_ISSET (ssm->listen_fd, rfdset))
+	new_client ();
+
+      for (i = 0; i < ssm->conn_pool_size; i++)
+	{
+	  if (!ssm->conn_pool[i].is_alloc)
+	    continue;
+
+	  conn = &ssm->conn_pool[i];
+#else
+      int num_ev;
+#ifdef VCL_TEST
+      num_ev = vppcom_epoll_wait (ssm->epfd, ssm->wait_events,
+				  SOCK_SERVER_MAX_EPOLL_EVENTS, 60.0);
+      if (num_ev < 0)
+	errno = -num_ev;
+#else
+      num_ev = epoll_wait (ssm->epfd, ssm->wait_events,
+			   SOCK_SERVER_MAX_EPOLL_EVENTS, 60000);
+#endif
+      if (num_ev < 0)
+	{
+	  perror ("epoll_wait()");
+	  fprintf (stderr, "\nSERVER: ERROR: epoll_wait() "
+		   "failed -- aborting!\n");
+	  main_rv = -1;
+	  goto done;
+	}
+      if (num_ev == 0)
+	{
+	  fprintf (stderr, "\nSERVER: epoll_wait() timeout!\n");
+	  continue;
+	}
+      for (i = 0; i < num_ev; i++)
+	{
+	  conn = &ssm->conn_pool[ssm->wait_events[i].data.u32];
+	  if (ssm->wait_events[i].events & (EPOLLHUP | EPOLLRDHUP))
+	    {
+#ifdef VCL_TEST
+	      vppcom_session_close (conn->fd);
+#else
+	      close (conn->fd);
+#endif
+	      continue;
+	    }
+	  if (ssm->wait_events[i].data.u32 == ~0)
+	    {
+	      new_client ();
+	      continue;
+	    }
+#if !defined (VCL_TEST)
+	  else if (ssm->wait_events[i].data.u32 ==
+		   SOCK_TEST_AF_UNIX_ACCEPT_DATA)
+	    {
+	      af_unix_echo ();
+	      continue;
+	    }
+#endif
+#endif
+	  client_fd = conn->fd;
+
+#if ! SOCK_SERVER_USE_EPOLL
+	  if (FD_ISSET (client_fd, rfdset))
+#else
+	  if (EPOLLIN & ssm->wait_events[i].events)
+#endif
+	    {
+	    read_again:
+	      rx_bytes = sock_test_read (client_fd, conn->buf,
+					 conn->buf_size, &conn->stats);
+	      if (rx_bytes > 0)
+		{
+		  rx_cfg = (vcl_test_cfg_t *) conn->buf;
+		  if (rx_cfg->magic == VCL_TEST_CFG_CTRL_MAGIC)
+		    {
+		      if (rx_cfg->verbose)
+			{
+			  printf ("SERVER (fd %d): Received a cfg message!\n",
+				  client_fd);
+			  vcl_test_cfg_dump (rx_cfg, 0 /* is_client */ );
+			}
+
+		      if (rx_bytes != sizeof (*rx_cfg))
+			{
+			  printf ("SERVER (fd %d): Invalid cfg message "
+				  "size (%d)!\n  Should be %lu bytes.\n",
+				  client_fd, rx_bytes, sizeof (*rx_cfg));
+			  conn->cfg.rxbuf_size = 0;
+			  conn->cfg.num_writes = 0;
+			  if (conn->cfg.verbose)
+			    {
+			      printf ("SERVER (fd %d): Replying to "
+				      "cfg message!\n", client_fd);
+			      vcl_test_cfg_dump (rx_cfg, 0 /* is_client */ );
+			    }
+			  sock_test_write (client_fd, (uint8_t *) & conn->cfg,
+					   sizeof (conn->cfg), NULL,
+					   conn->cfg.verbose);
+			  continue;
+			}
+
+		      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:
+			  stream_test_server_start_stop (conn, rx_cfg);
+			  break;
+
+			case VCL_TEST_TYPE_EXIT:
+			  printf ("SERVER: Have a great day, "
+				  "connection %d!\n", client_fd);
+#ifdef VCL_TEST
+			  vppcom_session_close (client_fd);
+#else
+			  close (client_fd);
+#endif
+			  conn_pool_free (conn);
+			  printf ("SERVER: Closed client fd %d\n", client_fd);
+#if ! SOCK_SERVER_USE_EPOLL
+			  if (ssm->nfds == (ssm->listen_fd + 1))
+#else
+			  ssm->nfds--;
+			  if (!ssm->nfds)
+#endif
+			    {
+			      printf ("SERVER: All client connections "
+				      "closed.\n\nSERVER: "
+				      "May the force be with you!\n\n");
+			      goto done;
+			    }
+			  break;
+
+			default:
+			  fprintf (stderr,
+				   "SERVER: ERROR: Unknown test type!\n");
+			  vcl_test_cfg_dump (rx_cfg, 0 /* is_client */ );
+			  break;
+			}
+		      continue;
+		    }
+
+		  else if ((conn->cfg.test == VCL_TEST_TYPE_UNI) ||
+			   (conn->cfg.test == VCL_TEST_TYPE_BI))
+		    {
+		      stream_test_server (conn, rx_bytes);
+		      if (ioctl (conn->fd, FIONREAD))
+			goto read_again;
+		      continue;
+		    }
+
+		  else if (isascii (conn->buf[0]))
+		    {
+		      // If it looks vaguely like a string, make sure it's terminated
+		      ((char *) conn->buf)[rx_bytes <
+					   conn->buf_size ? rx_bytes :
+					   conn->buf_size - 1] = 0;
+		      printf ("SERVER (fd %d): RX (%d bytes) - '%s'\n",
+			      conn->fd, rx_bytes, conn->buf);
+		    }
+		}
+	      else		// rx_bytes < 0
+		{
+		  if (errno == ECONNRESET)
+		    {
+		      printf ("\nSERVER: Connection reset by remote peer.\n"
+			      "  Y'all have a great day now!\n\n");
+		      break;
+		    }
+		  else
+		    continue;
+		}
+
+	      if (isascii (conn->buf[0]))
+		{
+		  /* If it looks vaguely like a string,
+		   * make sure it's terminated
+		   */
+		  ((char *) conn->buf)[rx_bytes <
+				       conn->buf_size ? rx_bytes :
+				       conn->buf_size - 1] = 0;
+		  if (xtra)
+		    fprintf (stderr, "SERVER: ERROR: "
+			     "FIFO not drained in previous test!\n"
+			     "       extra chunks %u (0x%x)\n"
+			     "        extra bytes %lu (0x%lx)\n",
+			     xtra, xtra, xtra_bytes, xtra_bytes);
+
+		  xtra = 0;
+		  xtra_bytes = 0;
+
+		  if (conn->cfg.verbose)
+		    printf ("SERVER (fd %d): Echoing back\n", client_fd);
+
+		  nbytes = strlen ((const char *) conn->buf) + 1;
+
+		  tx_bytes = sock_test_write (client_fd, conn->buf,
+					      nbytes, &conn->stats,
+					      conn->cfg.verbose);
+		  if (tx_bytes >= 0)
+		    printf ("SERVER (fd %d): TX (%d bytes) - '%s'\n",
+			    conn->fd, tx_bytes, conn->buf);
+		}
+
+	      else		// Extraneous read data from non-echo tests???
+		{
+		  xtra++;
+		  xtra_bytes += rx_bytes;
+		}
+	    }
+	}
+    }
+
+done:
+#ifdef VCL_TEST
+  vppcom_session_close (ssm->listen_fd);
+  vppcom_app_destroy ();
+#else
+  close (ssm->listen_fd);
+
+#if SOCK_SERVER_USE_EPOLL && !defined (VCL_TEST)
+  close (ssm->af_unix_listen_fd);
+  unlink ((const char *) SOCK_TEST_AF_UNIX_FILENAME);
+#endif /* SOCK_SERVER_USE_EPOLL */
+
+#endif
+  if (ssm->conn_pool)
+    free (ssm->conn_pool);
+
+  return main_rv;
+}
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */