Add config option to use dlmalloc instead of mheap
[vpp.git] / src / tests / vnet / session / tcp_echo.c
index 30eb54d..6e41e4b 100644 (file)
 #include <vpp/api/vpe_all_api_h.h>
 #undef vl_printfun
 
+#define TCP_ECHO_DBG 0
+#define DBG(_fmt,_args...)                     \
+    if (TCP_ECHO_DBG)                          \
+      clib_warning (_fmt, _args)
+
 typedef struct
 {
   svm_fifo_t *server_rx_fifo;
   svm_fifo_t *server_tx_fifo;
 
+  svm_msg_q_t *vpp_evt_q;
+
   u64 vpp_session_handle;
-  u64 bytes_received;
+  u64 bytes_sent;
+  u64 bytes_to_send;
+  volatile u64 bytes_received;
+  volatile u64 bytes_to_receive;
   f64 start;
 } session_t;
 
@@ -52,15 +62,17 @@ typedef enum
 {
   STATE_START,
   STATE_ATTACHED,
+  STATE_LISTEN,
   STATE_READY,
   STATE_DISCONNECTING,
-  STATE_FAILED
+  STATE_FAILED,
+  STATE_DETACHED
 } connection_state_t;
 
 typedef struct
 {
   /* vpe input queue */
-  unix_shared_memory_queue_t *vl_input_queue;
+  svm_queue_t *vl_input_queue;
 
   /* API client handle */
   u32 my_client_index;
@@ -85,13 +97,10 @@ typedef struct
   int i_am_master;
 
   /* drop all packets */
-  int drop_packets;
+  int no_return;
 
   /* Our event queue */
-  unix_shared_memory_queue_t *our_event_queue;
-
-  /* $$$ single thread only for the moment */
-  unix_shared_memory_queue_t *vpp_event_queue;
+  svm_msg_q_t *our_event_queue;
 
   u8 *socket_name;
 
@@ -113,10 +122,20 @@ typedef struct
   uword *error_string_by_error_number;
 
   u8 *connect_test_data;
-  pthread_t client_rx_thread_handle;
+  pthread_t *client_thread_handles;
+  u32 *thread_args;
   u32 client_bytes_received;
   u8 test_return_packets;
   u64 bytes_to_send;
+  u32 fifo_size;
+
+  u32 n_clients;
+  u64 tx_total;
+  u64 rx_total;
+
+  volatile u32 n_clients_connected;
+  volatile u32 n_active_clients;
+
 
   /** Flag that decides if socket, instead of svm, api is used to connect to
    * vpp. If sock api is used, shm binary api is subsequently bootstrapped
@@ -125,9 +144,9 @@ typedef struct
 
   /* convenience */
   svm_fifo_segment_main_t *segment_main;
-} uri_tcp_test_main_t;
+} echo_main_t;
 
-uri_tcp_test_main_t uri_tcp_test_main;
+echo_main_t echo_main;
 
 #if CLIB_DEBUG > 0
 #define NITER 10000
@@ -135,14 +154,70 @@ uri_tcp_test_main_t uri_tcp_test_main;
 #define NITER 4000000
 #endif
 
+const char test_srv_crt_rsa[] =
+  "-----BEGIN CERTIFICATE-----\r\n"
+  "MIID5zCCAs+gAwIBAgIJALeMYCEHrTtJMA0GCSqGSIb3DQEBCwUAMIGJMQswCQYD\r\n"
+  "VQQGEwJVUzELMAkGA1UECAwCQ0ExETAPBgNVBAcMCFNhbiBKb3NlMQ4wDAYDVQQK\r\n"
+  "DAVDaXNjbzEOMAwGA1UECwwFZmQuaW8xFjAUBgNVBAMMDXRlc3R0bHMuZmQuaW8x\r\n"
+  "IjAgBgkqhkiG9w0BCQEWE3ZwcC1kZXZAbGlzdHMuZmQuaW8wHhcNMTgwMzA1MjEx\r\n"
+  "NTEyWhcNMjgwMzAyMjExNTEyWjCBiTELMAkGA1UEBhMCVVMxCzAJBgNVBAgMAkNB\r\n"
+  "MREwDwYDVQQHDAhTYW4gSm9zZTEOMAwGA1UECgwFQ2lzY28xDjAMBgNVBAsMBWZk\r\n"
+  "LmlvMRYwFAYDVQQDDA10ZXN0dGxzLmZkLmlvMSIwIAYJKoZIhvcNAQkBFhN2cHAt\r\n"
+  "ZGV2QGxpc3RzLmZkLmlvMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA\r\n"
+  "4C1k8a1DuStgggqT4o09fP9sJ2dC54bxhS/Xk2VEfaIZ222WSo4X/syRVfVy9Yah\r\n"
+  "cpI1zJ/RDxaZSFhgA+nPZBrFMsrULkrdAOpOVj8eDEp9JuWdO2ODSoFnCvLxcYWB\r\n"
+  "Yc5kHryJpEaGJl1sFQSesnzMFty/59ta0stk0Fp8r5NhIjWvSovGzPo6Bhz+VS2c\r\n"
+  "ebIZh4x1t2hHaFcgm0qJoJ6DceReWCW8w+yOVovTolGGq+bpb2Hn7MnRSZ2K2NdL\r\n"
+  "+aLXpkZbS/AODP1FF2vTO1mYL290LO7/51vJmPXNKSDYMy5EvILr5/VqtjsFCwRL\r\n"
+  "Q4jcM/+GeHSAFWx4qIv0BwIDAQABo1AwTjAdBgNVHQ4EFgQUWa1SOB37xmT53tZQ\r\n"
+  "aXuLLhRI7U8wHwYDVR0jBBgwFoAUWa1SOB37xmT53tZQaXuLLhRI7U8wDAYDVR0T\r\n"
+  "BAUwAwEB/zANBgkqhkiG9w0BAQsFAAOCAQEAoUht13W4ya27NVzQuCMvqPWL3VM4\r\n"
+  "3xbPFk02FaGz/WupPu276zGlzJAZrbuDcQowwwU1Ni1Yygxl96s1c2M5rHDTrOKG\r\n"
+  "rK0hbkSFBo+i6I8u4HiiQ4rYmG0Hv6+sXn3of0HsbtDPGgWZoipPWDljPYEURu3e\r\n"
+  "3HRe/Dtsj9CakBoSDzs8ndWaBR+f4sM9Tk1cjD46Gq2T/qpSPXqKxEUXlzhdCAn4\r\n"
+  "twub17Bq2kykHpppCwPg5M+v30tHG/R2Go15MeFWbEJthFk3TZMjKL7UFs7fH+x2\r\n"
+  "wSonXb++jY+KmCb93C+soABBizE57g/KmiR2IxQ/LMjDik01RSUIaM0lLA==\r\n"
+  "-----END CERTIFICATE-----\r\n";
+const u32 test_srv_crt_rsa_len = sizeof (test_srv_crt_rsa);
+
+const char test_srv_key_rsa[] =
+  "-----BEGIN PRIVATE KEY-----\r\n"
+  "MIIEvQIBADANBgkqhkiG9w0BAQEFAASCBKcwggSjAgEAAoIBAQDgLWTxrUO5K2CC\r\n"
+  "CpPijT18/2wnZ0LnhvGFL9eTZUR9ohnbbZZKjhf+zJFV9XL1hqFykjXMn9EPFplI\r\n"
+  "WGAD6c9kGsUyytQuSt0A6k5WPx4MSn0m5Z07Y4NKgWcK8vFxhYFhzmQevImkRoYm\r\n"
+  "XWwVBJ6yfMwW3L/n21rSy2TQWnyvk2EiNa9Ki8bM+joGHP5VLZx5shmHjHW3aEdo\r\n"
+  "VyCbSomgnoNx5F5YJbzD7I5Wi9OiUYar5ulvYefsydFJnYrY10v5otemRltL8A4M\r\n"
+  "/UUXa9M7WZgvb3Qs7v/nW8mY9c0pINgzLkS8guvn9Wq2OwULBEtDiNwz/4Z4dIAV\r\n"
+  "bHioi/QHAgMBAAECggEBAMzGipP8+oT166U+NlJXRFifFVN1DvdhG9PWnOxGL+c3\r\n"
+  "ILmBBC08WQzmHshPemBvR6DZkA1H23cV5JTiLWrFtC00CvhXsLRMrE5+uWotI6yE\r\n"
+  "iofybMroHvD6/X5R510UX9hQ6MHu5ShLR5VZ9zXHz5MpTmB/60jG5dLx+jgcwBK8\r\n"
+  "LuGv2YB/WCUwT9QJ3YU2eaingnXtz/MrFbkbltrqlnBdlD+kTtw6Yac9y1XuuQXc\r\n"
+  "BPeulLNDuPolJVWbUvDBZrpt2dXTgz8ws1sv+wCNE0xwQJsqW4Nx3QkpibUL9RUr\r\n"
+  "CVbKlNfa9lopT6nGKlgX69R/uH35yh9AOsfasro6w0ECgYEA82UJ8u/+ORah+0sF\r\n"
+  "Q0FfW5MTdi7OAUHOz16pUsGlaEv0ERrjZxmAkHA/VRwpvDBpx4alCv0Hc39PFLIk\r\n"
+  "nhSsM2BEuBkTAs6/GaoNAiBtQVE/hN7awNRWVmlieS0go3Y3dzaE9IUMyj8sPOFT\r\n"
+  "5JdJ6BM69PHKCkY3dKdnnfpFEuECgYEA68mRpteunF1mdZgXs+WrN+uLlRrQR20F\r\n"
+  "ZyMYiUCH2Dtn26EzA2moy7FipIIrQcX/j+KhYNGM3e7MU4LymIO29E18mn8JODnH\r\n"
+  "sQOXzBTsf8A4yIVMkcuQD3bfb0JiUGYUPOidTp2N7IJA7+6Yc3vQOyb74lnKnJoO\r\n"
+  "gougPT2wS+cCgYAn7muzb6xFsXDhyW0Tm6YJYBfRS9yAWEuVufINobeBZPSl2cN1\r\n"
+  "Jrnw+HlrfTNbrJWuJmjtZJXUXQ6cVp2rUbjutNyRV4vG6iRwEXYQ40EJdkr1gZpi\r\n"
+  "CHQhuShuuPih2MNAy7EEbM+sXrDjTBR3bFqzuHPzu7dp+BshCFX3lRfAAQKBgGQt\r\n"
+  "K5i7IhCFDjb/+3IPLgOAK7mZvsvZ4eXD33TQ2eZgtut1PXtBtNl17/b85uv293Fm\r\n"
+  "VDISVcsk3eLNS8zIiT6afUoWlxAwXEs0v5WRfjl4radkGvgGiJpJYvyeM67877RB\r\n"
+  "EDSKc/X8ESLfOB44iGvZUEMG6zJFscx9DgN25iQZAoGAbyd+JEWwdVH9/K3IH1t2\r\n"
+  "PBkZX17kNWv+iVM1WyFjbe++vfKZCrOJiyiqhDeEqgrP3AuNMlaaduC3VRC3G5oV\r\n"
+  "Mj1tlhDWQ/qhvKdCKNdIVQYDE75nw+FRWV8yYkHAnXYW3tNoweDIwixE0hkPR1bc\r\n"
+  "oEjPLVNtx8SOj/M4rhaPT3I=\r\n" "-----END PRIVATE KEY-----\r\n";
+const u32 test_srv_key_rsa_len = sizeof (test_srv_key_rsa);
+
 static u8 *
 format_api_error (u8 * s, va_list * args)
 {
-  uri_tcp_test_main_t *utm = &uri_tcp_test_main;
+  echo_main_t *em = &echo_main;
   i32 error = va_arg (*args, u32);
   uword *p;
 
-  p = hash_get (utm->error_string_by_error_number, -error);
+  p = hash_get (em->error_string_by_error_number, -error);
 
   if (p)
     s = format (s, "%s", p[0]);
@@ -152,67 +227,103 @@ format_api_error (u8 * s, va_list * args)
 }
 
 static void
-init_error_string_table (uri_tcp_test_main_t * utm)
+init_error_string_table (echo_main_t * em)
 {
-  utm->error_string_by_error_number = hash_create (0, sizeof (uword));
+  em->error_string_by_error_number = hash_create (0, sizeof (uword));
 
-#define _(n,v,s) hash_set (utm->error_string_by_error_number, -v, s);
+#define _(n,v,s) hash_set (em->error_string_by_error_number, -v, s);
   foreach_vnet_api_error;
 #undef _
 
-  hash_set (utm->error_string_by_error_number, 99, "Misc");
+  hash_set (em->error_string_by_error_number, 99, "Misc");
 }
 
-int
-wait_for_state_change (uri_tcp_test_main_t * utm, connection_state_t state)
+static void handle_mq_event (session_event_t * e);
+
+static int
+wait_for_state_change (echo_main_t * em, connection_state_t state)
 {
+  svm_msg_q_msg_t msg;
+  session_event_t *e;
+  f64 timeout;
+
 #if CLIB_DEBUG > 0
 #define TIMEOUT 600.0
 #else
 #define TIMEOUT 600.0
 #endif
 
-  f64 timeout = clib_time_now (&utm->clib_time) + TIMEOUT;
+  timeout = clib_time_now (&em->clib_time) + TIMEOUT;
 
-  while (clib_time_now (&utm->clib_time) < timeout)
+  while (clib_time_now (&em->clib_time) < timeout)
     {
-      if (utm->state == state)
+      if (em->state == state)
        return 0;
-      if (utm->state == STATE_FAILED)
+      if (em->state == STATE_FAILED)
        return -1;
-      if (utm->time_to_stop == 1)
+      if (em->time_to_stop == 1)
        return 0;
+      if (!em->our_event_queue)
+       continue;
+
+      if (svm_msg_q_sub (em->our_event_queue, &msg, SVM_Q_NOWAIT, 0))
+       continue;
+      e = svm_msg_q_msg_data (em->our_event_queue, &msg);
+      handle_mq_event (e);
+      svm_msg_q_free_msg (em->our_event_queue, &msg);
     }
-  clib_warning ("timeout waiting for STATE_READY");
+  clib_warning ("timeout waiting for state %d", state);
   return -1;
 }
 
 void
-application_send_attach (uri_tcp_test_main_t * utm)
+application_send_attach (echo_main_t * em)
 {
   vl_api_application_attach_t *bmp;
-  u32 fifo_size = 4 << 20;
+  vl_api_application_tls_cert_add_t *cert_mp;
+  vl_api_application_tls_key_add_t *key_mp;
+
   bmp = vl_msg_api_alloc (sizeof (*bmp));
   memset (bmp, 0, sizeof (*bmp));
 
   bmp->_vl_msg_id = ntohs (VL_API_APPLICATION_ATTACH);
-  bmp->client_index = utm->my_client_index;
+  bmp->client_index = em->my_client_index;
   bmp->context = ntohl (0xfeedface);
-  bmp->options[APP_OPTIONS_FLAGS] =
-    APP_OPTIONS_FLAGS_ACCEPT_REDIRECT | APP_OPTIONS_FLAGS_ADD_SEGMENT;
+  bmp->options[APP_OPTIONS_FLAGS] = APP_OPTIONS_FLAGS_ACCEPT_REDIRECT;
+  bmp->options[APP_OPTIONS_FLAGS] |= APP_OPTIONS_FLAGS_ADD_SEGMENT;
+  bmp->options[APP_OPTIONS_FLAGS] |= APP_OPTIONS_FLAGS_USE_MQ_FOR_CTRL_MSGS;
   bmp->options[APP_OPTIONS_PREALLOC_FIFO_PAIRS] = 16;
-  bmp->options[APP_OPTIONS_RX_FIFO_SIZE] = fifo_size;
-  bmp->options[APP_OPTIONS_TX_FIFO_SIZE] = fifo_size;
+  bmp->options[APP_OPTIONS_RX_FIFO_SIZE] = em->fifo_size;
+  bmp->options[APP_OPTIONS_TX_FIFO_SIZE] = em->fifo_size;
   bmp->options[APP_OPTIONS_ADD_SEGMENT_SIZE] = 128 << 20;
   bmp->options[APP_OPTIONS_SEGMENT_SIZE] = 256 << 20;
-  vl_msg_api_send_shmem (utm->vl_input_queue, (u8 *) & bmp);
+  bmp->options[APP_OPTIONS_EVT_QUEUE_SIZE] = 256;
+  vl_msg_api_send_shmem (em->vl_input_queue, (u8 *) & bmp);
+
+  cert_mp = vl_msg_api_alloc (sizeof (*cert_mp) + test_srv_crt_rsa_len);
+  memset (cert_mp, 0, sizeof (*cert_mp));
+  cert_mp->_vl_msg_id = ntohs (VL_API_APPLICATION_TLS_CERT_ADD);
+  cert_mp->client_index = em->my_client_index;
+  cert_mp->context = ntohl (0xfeedface);
+  cert_mp->cert_len = clib_host_to_net_u16 (test_srv_crt_rsa_len);
+  clib_memcpy (cert_mp->cert, test_srv_crt_rsa, test_srv_crt_rsa_len);
+  vl_msg_api_send_shmem (em->vl_input_queue, (u8 *) & cert_mp);
+
+  key_mp = vl_msg_api_alloc (sizeof (*key_mp) + test_srv_key_rsa_len);
+  memset (key_mp, 0, sizeof (*key_mp) + test_srv_key_rsa_len);
+  key_mp->_vl_msg_id = ntohs (VL_API_APPLICATION_TLS_KEY_ADD);
+  key_mp->client_index = em->my_client_index;
+  key_mp->context = ntohl (0xfeedface);
+  key_mp->key_len = clib_host_to_net_u16 (test_srv_key_rsa_len);
+  clib_memcpy (key_mp->key, test_srv_key_rsa, test_srv_key_rsa_len);
+  vl_msg_api_send_shmem (em->vl_input_queue, (u8 *) & key_mp);
 }
 
-int
-application_attach (uri_tcp_test_main_t * utm)
+static int
+application_attach (echo_main_t * em)
 {
-  application_send_attach (utm);
-  if (wait_for_state_change (utm, STATE_ATTACHED))
+  application_send_attach (em);
+  if (wait_for_state_change (em, STATE_ATTACHED))
     {
       clib_warning ("timeout waiting for STATE_ATTACHED");
       return -1;
@@ -221,31 +332,81 @@ application_attach (uri_tcp_test_main_t * utm)
 }
 
 void
-application_detach (uri_tcp_test_main_t * utm)
+application_detach (echo_main_t * em)
 {
   vl_api_application_detach_t *bmp;
   bmp = vl_msg_api_alloc (sizeof (*bmp));
   memset (bmp, 0, sizeof (*bmp));
 
   bmp->_vl_msg_id = ntohs (VL_API_APPLICATION_DETACH);
-  bmp->client_index = utm->my_client_index;
+  bmp->client_index = em->my_client_index;
   bmp->context = ntohl (0xfeedface);
-  vl_msg_api_send_shmem (utm->vl_input_queue, (u8 *) & bmp);
+  vl_msg_api_send_shmem (em->vl_input_queue, (u8 *) & bmp);
+
+  DBG ("%s", "Sent detach");
+}
+
+static int
+memfd_segment_attach (void)
+{
+  ssvm_private_t _ssvm = { 0 }, *ssvm = &_ssvm;
+  clib_error_t *error;
+  int rv;
+
+  if ((error = vl_socket_client_recv_fd_msg (&ssvm->fd, 5)))
+    {
+      clib_error_report (error);
+      return -1;
+    }
+
+  if ((rv = ssvm_slave_init_memfd (ssvm)))
+    return rv;
+
+  return 0;
+}
+
+static int
+fifo_segment_attach (char *name, u32 size, ssvm_segment_type_t type)
+{
+  svm_fifo_segment_create_args_t _a, *a = &_a;
+  clib_error_t *error;
+  int rv;
+
+  memset (a, 0, sizeof (*a));
+  a->segment_name = (char *) name;
+  a->segment_size = size;
+  a->segment_type = type;
+
+  if (type == SSVM_SEGMENT_MEMFD)
+    {
+      if ((error = vl_socket_client_recv_fd_msg (&a->memfd_fd, 5)))
+       {
+         clib_error_report (error);
+         return -1;
+       }
+    }
+
+  if ((rv = svm_fifo_segment_attach (a)))
+    {
+      clib_warning ("svm_fifo_segment_attach ('%s') failed", name);
+      return rv;
+    }
+
+  return 0;
 }
 
 static void
 vl_api_application_attach_reply_t_handler (vl_api_application_attach_reply_t *
                                           mp)
 {
-  uri_tcp_test_main_t *utm = &uri_tcp_test_main;
-  svm_fifo_segment_create_args_t _a, *a = &_a;
-  int rv;
+  echo_main_t *em = &echo_main;
+  ssvm_segment_type_t seg_type;
 
   if (mp->retval)
     {
       clib_warning ("attach failed: %U", format_api_error,
                    clib_net_to_host_u32 (mp->retval));
-      utm->state = STATE_FAILED;
+      em->state = STATE_FAILED;
       return;
     }
 
@@ -255,25 +416,31 @@ vl_api_application_attach_reply_t_handler (vl_api_application_attach_reply_t *
       return;
     }
 
-  memset (a, 0, sizeof (*a));
-  a->segment_name = (char *) mp->segment_name;
-  a->segment_size = mp->segment_size;
-
-  ASSERT (mp->app_event_queue_address);
+  seg_type = em->use_sock_api ? SSVM_SEGMENT_MEMFD : SSVM_SEGMENT_SHM;
 
-  /* Attach to the segment vpp created */
-  rv = svm_fifo_segment_attach (a);
-  if (rv)
+  /* Attach to fifo segment */
+  if (fifo_segment_attach ((char *) mp->segment_name, mp->segment_size,
+                          seg_type))
     {
-      clib_warning ("svm_fifo_segment_attach ('%s') failed",
-                   mp->segment_name);
+      em->state = STATE_FAILED;
       return;
     }
 
-  utm->our_event_queue =
-    uword_to_pointer (mp->app_event_queue_address,
-                     unix_shared_memory_queue_t *);
-  utm->state = STATE_ATTACHED;
+  /* If we're using memfd segments, read and attach to event qs segment */
+  if (seg_type == SSVM_SEGMENT_MEMFD)
+    {
+      if (memfd_segment_attach ())
+       {
+         clib_warning ("failed to attach to evt q segment");
+         em->state = STATE_FAILED;
+         return;
+       }
+    }
+
+  ASSERT (mp->app_event_queue_address);
+  em->our_event_queue = uword_to_pointer (mp->app_event_queue_address,
+                                         svm_msg_q_t *);
+  em->state = STATE_ATTACHED;
 }
 
 static void
@@ -282,12 +449,13 @@ vl_api_application_detach_reply_t_handler (vl_api_application_detach_reply_t *
 {
   if (mp->retval)
     clib_warning ("detach returned with err: %d", mp->retval);
+  echo_main.state = STATE_DETACHED;
 }
 
 static void
 stop_signal (int signum)
 {
-  uri_tcp_test_main_t *um = &uri_tcp_test_main;
+  echo_main_t *um = &echo_main;
 
   um->time_to_stop = 1;
 }
@@ -295,7 +463,7 @@ stop_signal (int signum)
 static void
 stats_signal (int signum)
 {
-  uri_tcp_test_main_t *um = &uri_tcp_test_main;
+  echo_main_t *um = &echo_main;
 
   um->time_to_print_stats = 1;
 }
@@ -319,31 +487,41 @@ vlib_cli_output (struct vlib_main_t *vm, char *fmt, ...)
 int
 connect_to_vpp (char *name)
 {
-  uri_tcp_test_main_t *utm = &uri_tcp_test_main;
+  echo_main_t *em = &echo_main;
   api_main_t *am = &api_main;
 
-  if (utm->use_sock_api)
+  if (em->use_sock_api)
     {
-      if (vl_socket_client_connect ((char *) utm->socket_name, name,
+      if (vl_socket_client_connect ((char *) em->socket_name, name,
                                    0 /* default rx, tx buffer */ ))
-       return -1;
+       {
+         clib_warning ("socket connect failed");
+         return -1;
+       }
 
-      return vl_socket_client_init_shm (0);
+      if (vl_socket_client_init_shm (0))
+       {
+         clib_warning ("init shm api failed");
+         return -1;
+       }
     }
   else
     {
       if (vl_client_connect_to_vlib ("/vpe-api", name, 32) < 0)
-       return -1;
-      utm->vl_input_queue = am->shmem_hdr->vl_input_queue;
-      utm->my_client_index = am->my_client_index;
+       {
+         clib_warning ("shmem connect failed");
+         return -1;
+       }
     }
+  em->vl_input_queue = am->shmem_hdr->vl_input_queue;
+  em->my_client_index = am->my_client_index;
   return 0;
 }
 
 void
-disconnect_from_vpp (uri_tcp_test_main_t * utm)
+disconnect_from_vpp (echo_main_t * em)
 {
-  if (utm->use_sock_api)
+  if (em->use_sock_api)
     vl_socket_client_disconnect ();
   else
     vl_client_disconnect_from_vlib ();
@@ -371,193 +549,273 @@ vl_api_map_another_segment_t_handler (vl_api_map_another_segment_t * mp)
 }
 
 static void
-session_print_stats (uri_tcp_test_main_t * utm, session_t * session)
+session_print_stats (echo_main_t * em, session_t * session)
 {
   f64 deltat;
   u64 bytes;
 
-  deltat = clib_time_now (&utm->clib_time) - session->start;
-  bytes = utm->i_am_master ? session->bytes_received : utm->bytes_to_send;
+  deltat = clib_time_now (&em->clib_time) - session->start;
+  bytes = em->i_am_master ? session->bytes_received : em->bytes_to_send;
   fformat (stdout, "Finished in %.6f\n", deltat);
   fformat (stdout, "%.4f Gbit/second\n", (bytes * 8.0) / deltat / 1e9);
 }
 
 static void
-vl_api_disconnect_session_t_handler (vl_api_disconnect_session_t * mp)
+test_recv_bytes (session_t * s, u8 * rx_buf, u32 n_read)
 {
-  uri_tcp_test_main_t *utm = &uri_tcp_test_main;
-  session_t *session = 0;
-  vl_api_disconnect_session_reply_t *rmp;
-  uword *p;
-  int rv = 0;
-
-  p = hash_get (utm->session_index_by_vpp_handles, mp->handle);
-
-  if (p)
-    {
-      session = pool_elt_at_index (utm->sessions, p[0]);
-      hash_unset (utm->session_index_by_vpp_handles, mp->handle);
-      pool_put (utm->sessions, session);
-    }
-  else
+  int i;
+  for (i = 0; i < n_read; i++)
     {
-      clib_warning ("couldn't find session key %llx", mp->handle);
-      rv = -11;
+      if (rx_buf[i] != ((s->bytes_received + i) & 0xff))
+       {
+         clib_warning ("error at byte %lld, 0x%x not 0x%x",
+                       s->bytes_received + i, rx_buf[i],
+                       ((s->bytes_received + i) & 0xff));
+       }
     }
-
-//  utm->time_to_stop = 1;
-
-  rmp = vl_msg_api_alloc (sizeof (*rmp));
-  memset (rmp, 0, sizeof (*rmp));
-
-  rmp->_vl_msg_id = ntohs (VL_API_DISCONNECT_SESSION_REPLY);
-  rmp->retval = rv;
-  rmp->handle = mp->handle;
-  vl_msg_api_send_shmem (utm->vl_input_queue, (u8 *) & rmp);
-
-  if (session)
-    session_print_stats (utm, session);
 }
 
 static void
-vl_api_reset_session_t_handler (vl_api_reset_session_t * mp)
+recv_test_chunk (echo_main_t * em, session_t * s, u8 * rx_buf)
 {
-  uri_tcp_test_main_t *utm = &uri_tcp_test_main;
-  vl_api_reset_session_reply_t *rmp;
-  uword *p;
-  int rv = 0;
+  svm_fifo_t *rx_fifo = s->server_rx_fifo;
+  u32 n_read_now, n_to_read;
+  int n_read;
 
-  p = hash_get (utm->session_index_by_vpp_handles, mp->handle);
+  n_to_read = svm_fifo_max_dequeue (rx_fifo);
+  svm_fifo_unset_event (rx_fifo);
 
-  if (p)
-    {
-      clib_warning ("got reset");
-      /* Cleanup later */
-      utm->time_to_stop = 1;
-    }
-  else
+  do
     {
-      clib_warning ("couldn't find session key %llx", mp->handle);
-      rv = -11;
-    }
+      n_read_now = clib_min (vec_len (rx_buf), n_to_read);
+      n_read = svm_fifo_dequeue_nowait (rx_fifo, n_read_now, rx_buf);
+      if (n_read <= 0)
+       break;
 
-  rmp = vl_msg_api_alloc (sizeof (*rmp));
-  memset (rmp, 0, sizeof (*rmp));
-  rmp->_vl_msg_id = ntohs (VL_API_RESET_SESSION_REPLY);
-  rmp->retval = rv;
-  rmp->handle = mp->handle;
-  vl_msg_api_send_shmem (utm->vl_input_queue, (u8 *) & rmp);
+      if (n_read_now != n_read)
+       clib_warning ("huh?");
+
+      if (em->test_return_packets)
+       test_recv_bytes (s, rx_buf, n_read);
+
+      n_to_read -= n_read;
+      s->bytes_received += n_read;
+      s->bytes_to_receive -= n_read;
+    }
+  while (n_to_read > 0);
 }
 
 void
-client_handle_fifo_event_rx (uri_tcp_test_main_t * utm,
-                            session_fifo_event_t * e)
+client_handle_fifo_event_rx (echo_main_t * em, session_event_t * e,
+                            u8 * rx_buf)
 {
-  svm_fifo_t *rx_fifo;
-  int n_read, bytes, i;
+  session_t *s;
 
-  rx_fifo = e->fifo;
+  s = pool_elt_at_index (em->sessions, e->fifo->client_session_index);
+  recv_test_chunk (em, s, rx_buf);
+}
 
-  bytes = svm_fifo_max_dequeue (rx_fifo);
-  /* Allow enqueuing of new event */
-  svm_fifo_unset_event (rx_fifo);
+static void
+send_test_chunk (echo_main_t * em, session_t * s)
+{
+  u64 test_buf_len, bytes_this_chunk, test_buf_offset;
+  svm_fifo_t *tx_fifo = s->server_tx_fifo;
+  u8 *test_data = em->connect_test_data;
+  u32 enq_space, min_chunk = 16 << 10;
+  int written;
+
+  test_buf_len = vec_len (test_data);
+  test_buf_offset = s->bytes_sent % test_buf_len;
+  bytes_this_chunk = clib_min (test_buf_len - test_buf_offset,
+                              s->bytes_to_send);
+  enq_space = svm_fifo_max_enqueue (tx_fifo);
+  if (enq_space < clib_min (bytes_this_chunk, min_chunk))
+    return;
 
-  /* Read the bytes */
-  do
+  bytes_this_chunk = clib_min (bytes_this_chunk, enq_space);
+  written = svm_fifo_enqueue_nowait (tx_fifo, bytes_this_chunk,
+                                    test_data + test_buf_offset);
+
+  if (written > 0)
     {
-      n_read = svm_fifo_dequeue_nowait (rx_fifo,
-                                       clib_min (vec_len (utm->rx_buf),
-                                                 bytes), utm->rx_buf);
-      if (n_read > 0)
-       {
-         bytes -= n_read;
-         if (utm->test_return_packets)
-           {
-             for (i = 0; i < n_read; i++)
-               {
-                 if (utm->rx_buf[i]
-                     != ((utm->client_bytes_received + i) & 0xff))
-                   {
-                     clib_warning ("error at byte %lld, 0x%x not 0x%x",
-                                   utm->client_bytes_received + i,
-                                   utm->rx_buf[i],
-                                   ((utm->client_bytes_received +
-                                     i) & 0xff));
-                   }
-               }
-           }
-         utm->client_bytes_received += n_read;
-       }
-      else
-       {
-         if (n_read == -2)
-           {
-//            clib_warning ("weird!");
-             break;
-           }
-       }
+      s->bytes_to_send -= written;
+      s->bytes_sent += written;
 
+      if (svm_fifo_set_event (tx_fifo))
+       app_send_io_evt_to_vpp (s->vpp_evt_q, tx_fifo, FIFO_EVENT_APP_TX,
+                               0 /* do wait for mutex */ );
     }
-  while (bytes > 0);
 }
 
-void
-client_handle_event_queue (uri_tcp_test_main_t * utm)
+/*
+ * Rx/Tx polling thread per connection
+ */
+static void *
+client_thread_fn (void *arg)
 {
-  session_fifo_event_t _e, *e = &_e;;
+  echo_main_t *em = &echo_main;
+  static u8 *rx_buf = 0;
+  u32 session_index = *(u32 *) arg;
+  session_t *s;
 
-  unix_shared_memory_queue_sub (utm->our_event_queue, (u8 *) e,
-                               0 /* nowait */ );
-  switch (e->event_type)
-    {
-    case FIFO_EVENT_APP_RX:
-      client_handle_fifo_event_rx (utm, e);
-      break;
+  vec_validate (rx_buf, 1 << 20);
 
-    case FIFO_EVENT_DISCONNECT:
-      return;
+  while (!em->time_to_stop && em->state != STATE_READY)
+    ;
 
-    default:
-      clib_warning ("unknown event type %d", e->event_type);
-      break;
+  s = pool_elt_at_index (em->sessions, session_index);
+  while (!em->time_to_stop)
+    {
+      send_test_chunk (em, s);
+      recv_test_chunk (em, s, rx_buf);
+      if (!s->bytes_to_send && !s->bytes_to_receive)
+       break;
     }
+
+  DBG ("session %d done", session_index);
+  em->tx_total += s->bytes_sent;
+  em->rx_total += s->bytes_received;
+  em->n_active_clients--;
+
+  pthread_exit (0);
 }
 
-static void *
+/*
+ * Rx thread that handles all connections.
+ *
+ * Not used.
+ */
+void *
 client_rx_thread_fn (void *arg)
 {
-  session_fifo_event_t _e, *e = &_e;
-  uri_tcp_test_main_t *utm = &uri_tcp_test_main;
+  session_event_t _e, *e = &_e;
+  echo_main_t *em = &echo_main;
+  static u8 *rx_buf = 0;
+  svm_msg_q_msg_t msg;
 
-  utm->client_bytes_received = 0;
-  while (1)
+  vec_validate (rx_buf, 1 << 20);
+
+  while (!em->time_to_stop && em->state != STATE_READY)
+    ;
+
+  while (!em->time_to_stop)
     {
-      unix_shared_memory_queue_sub (utm->our_event_queue, (u8 *) e,
-                                   0 /* nowait */ );
+      svm_msg_q_sub (em->our_event_queue, &msg, SVM_Q_WAIT, 0);
+      e = svm_msg_q_msg_data (em->our_event_queue, &msg);
       switch (e->event_type)
        {
        case FIFO_EVENT_APP_RX:
-         client_handle_fifo_event_rx (utm, e);
+         client_handle_fifo_event_rx (em, e, rx_buf);
          break;
-
-       case FIFO_EVENT_DISCONNECT:
-         return 0;
        default:
          clib_warning ("unknown event type %d", e->event_type);
          break;
        }
-
-      if (PREDICT_FALSE (utm->time_to_stop == 1))
-       break;
+      svm_msg_q_free_msg (em->our_event_queue, &msg);
     }
   pthread_exit (0);
 }
 
+void
+client_send_connect (echo_main_t * em)
+{
+  vl_api_connect_uri_t *cmp;
+  cmp = vl_msg_api_alloc (sizeof (*cmp));
+  memset (cmp, 0, sizeof (*cmp));
+
+  cmp->_vl_msg_id = ntohs (VL_API_CONNECT_URI);
+  cmp->client_index = em->my_client_index;
+  cmp->context = ntohl (0xfeedface);
+  memcpy (cmp->uri, em->connect_uri, vec_len (em->connect_uri));
+  vl_msg_api_send_shmem (em->vl_input_queue, (u8 *) & cmp);
+}
+
+void
+client_send_disconnect (echo_main_t * em, session_t * s)
+{
+  vl_api_disconnect_session_t *dmp;
+  dmp = vl_msg_api_alloc (sizeof (*dmp));
+  memset (dmp, 0, sizeof (*dmp));
+  dmp->_vl_msg_id = ntohs (VL_API_DISCONNECT_SESSION);
+  dmp->client_index = em->my_client_index;
+  dmp->handle = s->vpp_session_handle;
+  vl_msg_api_send_shmem (em->vl_input_queue, (u8 *) & dmp);
+}
+
+int
+client_disconnect (echo_main_t * em, session_t * s)
+{
+  client_send_disconnect (em, s);
+  pool_put (em->sessions, s);
+  memset (s, 0xfe, sizeof (*s));
+  return 0;
+}
 
 static void
-vl_api_connect_session_reply_t_handler (vl_api_connect_session_reply_t * mp)
+session_accepted_handler (session_accepted_msg_t * mp)
 {
-  uri_tcp_test_main_t *utm = &uri_tcp_test_main;
+  app_session_evt_t _app_evt, *app_evt = &_app_evt;
+  session_accepted_reply_msg_t *rmp;
+  svm_fifo_t *rx_fifo, *tx_fifo;
+  echo_main_t *em = &echo_main;
+  session_t *session;
+  static f64 start_time;
+  u32 session_index;
+  u8 *ip_str;
+
+  if (start_time == 0.0)
+    start_time = clib_time_now (&em->clib_time);
+
+  ip_str = format (0, "%U", format_ip46_address, &mp->ip, mp->is_ip4);
+  clib_warning ("Accepted session from: %s:%d", ip_str,
+               clib_net_to_host_u16 (mp->port));
+
+  /* Allocate local session and set it up */
+  pool_get (em->sessions, session);
+  session_index = session - em->sessions;
+
+  rx_fifo = uword_to_pointer (mp->server_rx_fifo, svm_fifo_t *);
+  rx_fifo->client_session_index = session_index;
+  tx_fifo = uword_to_pointer (mp->server_tx_fifo, svm_fifo_t *);
+  tx_fifo->client_session_index = session_index;
+
+  session->server_rx_fifo = rx_fifo;
+  session->server_tx_fifo = tx_fifo;
+  session->vpp_evt_q = uword_to_pointer (mp->vpp_event_queue_address,
+                                        svm_msg_q_t *);
+
+  /* Add it to lookup table */
+  hash_set (em->session_index_by_vpp_handles, mp->handle, session_index);
+
+  em->state = STATE_READY;
+
+  /* Stats printing */
+  if (pool_elts (em->sessions) && (pool_elts (em->sessions) % 20000) == 0)
+    {
+      f64 now = clib_time_now (&em->clib_time);
+      fformat (stdout, "%d active sessions in %.2f seconds, %.2f/sec...\n",
+              pool_elts (em->sessions), now - start_time,
+              (f64) pool_elts (em->sessions) / (now - start_time));
+    }
+
+  /*
+   * Send accept reply to vpp
+   */
+  app_alloc_ctrl_evt_to_vpp (session->vpp_evt_q, app_evt,
+                            SESSION_CTRL_EVT_ACCEPTED_REPLY);
+  rmp = (session_accepted_reply_msg_t *) app_evt->evt->data;
+  rmp->handle = mp->handle;
+  rmp->context = mp->context;
+  app_send_ctrl_evt_to_vpp (session->vpp_evt_q, app_evt);
+
+  session->bytes_received = 0;
+  session->start = clib_time_now (&em->clib_time);
+}
+
+static void
+session_connected_handler (session_connected_msg_t * mp)
+{
+  echo_main_t *em = &echo_main;
   session_t *session;
   u32 session_index;
   svm_fifo_t *rx_fifo, *tx_fifo;
@@ -567,26 +825,17 @@ vl_api_connect_session_reply_t_handler (vl_api_connect_session_reply_t * mp)
     {
       clib_warning ("connection failed with code: %U", format_api_error,
                    clib_net_to_host_u32 (mp->retval));
-      utm->state = STATE_FAILED;
+      em->state = STATE_FAILED;
       return;
     }
-  else
-    {
-      clib_warning ("connected with local ip %U port %d", format_ip46_address,
-                   mp->lcl_ip, mp->is_ip4,
-                   clib_net_to_host_u16 (mp->lcl_port));
-    }
-
-  utm->vpp_event_queue =
-    uword_to_pointer (mp->vpp_event_queue_address,
-                     unix_shared_memory_queue_t *);
 
   /*
    * Setup session
    */
 
-  pool_get (utm->sessions, session);
-  session_index = session - utm->sessions;
+  pool_get (em->sessions, session);
+  memset (session, 0, sizeof (*session));
+  session_index = session - em->sessions;
 
   rx_fifo = uword_to_pointer (mp->server_rx_fifo, svm_fifo_t *);
   rx_fifo->client_session_index = session_index;
@@ -596,222 +845,238 @@ vl_api_connect_session_reply_t_handler (vl_api_connect_session_reply_t * mp)
   session->server_rx_fifo = rx_fifo;
   session->server_tx_fifo = tx_fifo;
   session->vpp_session_handle = mp->handle;
-  session->start = clib_time_now (&utm->clib_time);
+  session->start = clib_time_now (&em->clib_time);
+  session->vpp_evt_q = uword_to_pointer (mp->vpp_event_queue_address,
+                                        svm_msg_q_t *);
 
-  /* Save handle */
-  utm->connected_session_index = session_index;
-  utm->state = STATE_READY;
+  hash_set (em->session_index_by_vpp_handles, mp->handle, session_index);
 
-  /* Add it to lookup table */
-  hash_set (utm->session_index_by_vpp_handles, mp->handle, session_index);
-
-  /* Start RX thread */
-  rv = pthread_create (&utm->client_rx_thread_handle,
-                      NULL /*attr */ , client_rx_thread_fn, 0);
+  /*
+   * Start RX thread
+   */
+  em->thread_args[em->n_clients_connected] = session_index;
+  rv = pthread_create (&em->client_thread_handles[em->n_clients_connected],
+                      NULL /*attr */ , client_thread_fn,
+                      (void *) &em->thread_args[em->n_clients_connected]);
   if (rv)
     {
       clib_warning ("pthread_create returned %d", rv);
-      rv = VNET_API_ERROR_SYSCALL_ERROR_1;
+      return;
     }
+
+  em->n_clients_connected += 1;
+  clib_warning ("session %u (0x%llx) connected with local ip %U port %d",
+               session_index, mp->handle, format_ip46_address, mp->lcl_ip,
+               mp->is_ip4, clib_net_to_host_u16 (mp->lcl_port));
 }
 
 static void
-send_test_chunk (uri_tcp_test_main_t * utm, svm_fifo_t * tx_fifo, int mypid,
-                u32 bytes)
+session_disconnected_handler (session_disconnected_msg_t * mp)
 {
-  u8 *test_data = utm->connect_test_data;
-  u64 bytes_sent = 0;
-  int test_buf_offset = 0;
-  u32 bytes_to_snd;
-  u32 queue_max_chunk = 128 << 10, actual_write;
-  session_fifo_event_t evt;
-  int rv;
+  app_session_evt_t _app_evt, *app_evt = &_app_evt;
+  session_disconnected_reply_msg_t *rmp;
+  echo_main_t *em = &echo_main;
+  session_t *session = 0;
+  uword *p;
+  int rv = 0;
 
-  bytes_to_snd = (bytes == 0) ? vec_len (test_data) : bytes;
-  if (bytes_to_snd > vec_len (test_data))
-    bytes_to_snd = vec_len (test_data);
+  p = hash_get (em->session_index_by_vpp_handles, mp->handle);
 
-  while (bytes_to_snd > 0 && !utm->time_to_stop)
+  if (p)
     {
-      actual_write = (bytes_to_snd > queue_max_chunk) ?
-       queue_max_chunk : bytes_to_snd;
-      rv = svm_fifo_enqueue_nowait (tx_fifo, actual_write,
-                                   test_data + test_buf_offset);
-
-      if (rv > 0)
-       {
-         bytes_to_snd -= rv;
-         test_buf_offset += rv;
-         bytes_sent += rv;
-
-         if (svm_fifo_set_event (tx_fifo))
-           {
-             /* Fabricate TX event, send to vpp */
-             evt.fifo = tx_fifo;
-             evt.event_type = FIFO_EVENT_APP_TX;
-
-             unix_shared_memory_queue_add (utm->vpp_event_queue,
-                                           (u8 *) & evt,
-                                           0 /* do wait for mutex */ );
-           }
-       }
+      clib_warning ("disconnected");
+      session = pool_elt_at_index (em->sessions, p[0]);
+      hash_unset (em->session_index_by_vpp_handles, mp->handle);
+      pool_put (em->sessions, session);
     }
-}
-
-void
-client_send_data (uri_tcp_test_main_t * utm)
-{
-  u8 *test_data = utm->connect_test_data;
-  int mypid = getpid ();
-  session_t *session;
-  svm_fifo_t *tx_fifo;
-  u32 n_iterations, leftover;
-  int i;
-
-  session = pool_elt_at_index (utm->sessions, utm->connected_session_index);
-  tx_fifo = session->server_tx_fifo;
-
-  ASSERT (vec_len (test_data) > 0);
-
-  vec_validate (utm->rx_buf, vec_len (test_data) - 1);
-  n_iterations = utm->bytes_to_send / vec_len (test_data);
-
-  for (i = 0; i < n_iterations; i++)
+  else
     {
-      send_test_chunk (utm, tx_fifo, mypid, 0);
-      if (utm->time_to_stop)
-       break;
+      clib_warning ("couldn't find session key %llx", mp->handle);
+      rv = -11;
     }
 
-  leftover = utm->bytes_to_send % vec_len (test_data);
-  if (leftover)
-    send_test_chunk (utm, tx_fifo, mypid, leftover);
-
-  if (!utm->drop_packets)
-    {
-      f64 timeout = clib_time_now (&utm->clib_time) + 10;
+  app_alloc_ctrl_evt_to_vpp (session->vpp_evt_q, app_evt,
+                            SESSION_CTRL_EVT_DISCONNECTED_REPLY);
+  rmp = (session_disconnected_reply_msg_t *) app_evt->evt->data;
+  rmp->retval = rv;
+  rmp->handle = mp->handle;
+  rmp->context = mp->context;
+  app_send_ctrl_evt_to_vpp (session->vpp_evt_q, app_evt);
 
-      /* Wait for the outstanding packets */
-      while (utm->client_bytes_received <
-            vec_len (test_data) * n_iterations + leftover)
-       {
-         if (clib_time_now (&utm->clib_time) > timeout)
-           {
-             clib_warning ("timed out waiting for the missing packets");
-             break;
-           }
-       }
-    }
-  utm->time_to_stop = 1;
+  if (session)
+    session_print_stats (em, session);
 }
 
-void
-client_send_connect (uri_tcp_test_main_t * utm)
+static void
+session_reset_handler (session_reset_msg_t * mp)
 {
-  vl_api_connect_uri_t *cmp;
-  cmp = vl_msg_api_alloc (sizeof (*cmp));
-  memset (cmp, 0, sizeof (*cmp));
+  app_session_evt_t _app_evt, *app_evt = &_app_evt;
+  echo_main_t *em = &echo_main;
+  session_reset_reply_msg_t *rmp;
+  session_t *session = 0;
+  uword *p;
+  int rv = 0;
 
-  cmp->_vl_msg_id = ntohs (VL_API_CONNECT_URI);
-  cmp->client_index = utm->my_client_index;
-  cmp->context = ntohl (0xfeedface);
-  memcpy (cmp->uri, utm->connect_uri, vec_len (utm->connect_uri));
-  vl_msg_api_send_shmem (utm->vl_input_queue, (u8 *) & cmp);
-}
+  p = hash_get (em->session_index_by_vpp_handles, mp->handle);
 
-int
-client_connect (uri_tcp_test_main_t * utm)
-{
-  client_send_connect (utm);
-  if (wait_for_state_change (utm, STATE_READY))
+  if (p)
     {
-      clib_warning ("Connect failed");
-      return -1;
+      session = pool_elt_at_index (em->sessions, p[0]);
+      clib_warning ("got reset");
+      /* Cleanup later */
+      em->time_to_stop = 1;
+    }
+  else
+    {
+      clib_warning ("couldn't find session key %llx", mp->handle);
+      return;
     }
-  return 0;
-}
 
-void
-client_send_disconnect (uri_tcp_test_main_t * utm)
-{
-  session_t *connected_session;
-  vl_api_disconnect_session_t *dmp;
-  connected_session = pool_elt_at_index (utm->sessions,
-                                        utm->connected_session_index);
-  dmp = vl_msg_api_alloc (sizeof (*dmp));
-  memset (dmp, 0, sizeof (*dmp));
-  dmp->_vl_msg_id = ntohs (VL_API_DISCONNECT_SESSION);
-  dmp->client_index = utm->my_client_index;
-  dmp->handle = connected_session->vpp_session_handle;
-  vl_msg_api_send_shmem (utm->vl_input_queue, (u8 *) & dmp);
+  app_alloc_ctrl_evt_to_vpp (session->vpp_evt_q, app_evt,
+                            SESSION_CTRL_EVT_RESET_REPLY);
+  rmp = (session_reset_reply_msg_t *) app_evt->evt->data;
+  rmp->retval = rv;
+  rmp->handle = mp->handle;
+  app_send_ctrl_evt_to_vpp (session->vpp_evt_q, app_evt);
 }
 
-int
-client_disconnect (uri_tcp_test_main_t * utm)
+static void
+handle_mq_event (session_event_t * e)
 {
-  client_send_disconnect (utm);
-  clib_warning ("Sent disconnect");
-  if (wait_for_state_change (utm, STATE_START))
+  switch (e->event_type)
     {
-      clib_warning ("Disconnect failed");
-      return -1;
+    case SESSION_CTRL_EVT_ACCEPTED:
+      session_accepted_handler ((session_accepted_msg_t *) e->data);
+      break;
+    case SESSION_CTRL_EVT_CONNECTED:
+      session_connected_handler ((session_connected_msg_t *) e->data);
+      break;
+    case SESSION_CTRL_EVT_DISCONNECTED:
+      session_disconnected_handler ((session_disconnected_msg_t *) e->data);
+      break;
+    case SESSION_CTRL_EVT_RESET:
+      session_reset_handler ((session_reset_msg_t *) e->data);
+      break;
+    default:
+      clib_warning ("unhandled %u", e->event_type);
     }
-  return 0;
 }
 
 static void
-client_run (uri_tcp_test_main_t * utm)
+clients_run (echo_main_t * em)
 {
+  f64 start_time, deltat, timeout = 100.0;
+  svm_msg_q_msg_t msg;
+  session_event_t *e;
+  session_t *s;
   int i;
 
-  if (application_attach (utm))
+  /* Init test data */
+  vec_validate (em->connect_test_data, 1024 * 1024 - 1);
+  for (i = 0; i < vec_len (em->connect_test_data); i++)
+    em->connect_test_data[i] = i & 0xff;
+
+  /*
+   * Attach and connect the clients
+   */
+  if (application_attach (em))
     return;
 
-  if (client_connect (utm))
+  for (i = 0; i < em->n_clients; i++)
+    client_send_connect (em);
+
+  start_time = clib_time_now (&em->clib_time);
+  while (em->n_clients_connected < em->n_clients
+        && (clib_time_now (&em->clib_time) - start_time < timeout)
+        && em->state != STATE_FAILED)
+
     {
-      application_detach (utm);
+      svm_msg_q_sub (em->our_event_queue, &msg, SVM_Q_WAIT, 0);
+      e = svm_msg_q_msg_data (em->our_event_queue, &msg);
+      handle_mq_event (e);
+      svm_msg_q_free_msg (em->our_event_queue, &msg);
+    }
+
+  if (em->n_clients_connected != em->n_clients)
+    {
+      clib_warning ("failed to initialize all connections");
       return;
     }
 
-  /* Init test data */
-  vec_validate (utm->connect_test_data, 128 * 1024 - 1);
-  for (i = 0; i < vec_len (utm->connect_test_data); i++)
-    utm->connect_test_data[i] = i & 0xff;
+  /*
+   * Initialize connections
+   */
+  for (i = 0; i < em->n_clients; i++)
+    {
+      s = pool_elt_at_index (em->sessions, i);
+      s->bytes_to_send = em->bytes_to_send;
+      if (!em->no_return)
+       s->bytes_to_receive = em->bytes_to_send;
+    }
+  em->n_active_clients = em->n_clients_connected;
 
-  /* Start send */
-  client_send_data (utm);
+  /*
+   * Wait for client threads to send the data
+   */
+  start_time = clib_time_now (&em->clib_time);
+  em->state = STATE_READY;
+  while (em->n_active_clients)
+    if (!svm_msg_q_is_empty (em->our_event_queue))
+      {
+       if (svm_msg_q_sub (em->our_event_queue, &msg, SVM_Q_WAIT, 0))
+         {
+           clib_warning ("svm msg q returned");
+           continue;
+         }
+       e = svm_msg_q_msg_data (em->our_event_queue, &msg);
+       if (e->event_type != FIFO_EVENT_APP_RX)
+         handle_mq_event (e);
+       svm_msg_q_free_msg (em->our_event_queue, &msg);
+      }
+
+  for (i = 0; i < em->n_clients; i++)
+    {
+      s = pool_elt_at_index (em->sessions, i);
+      client_disconnect (em, s);
+    }
 
-  /* Disconnect */
-  client_disconnect (utm);
+  /*
+   * Stats and detach
+   */
+  deltat = clib_time_now (&em->clib_time) - start_time;
+  fformat (stdout, "%lld bytes (%lld mbytes, %lld gbytes) in %.2f seconds\n",
+          em->tx_total, em->tx_total / (1ULL << 20),
+          em->tx_total / (1ULL << 30), deltat);
+  fformat (stdout, "%.4f Gbit/second\n", (em->tx_total * 8.0) / deltat / 1e9);
 
-  application_detach (utm);
+  application_detach (em);
 }
 
 static void
 vl_api_bind_uri_reply_t_handler (vl_api_bind_uri_reply_t * mp)
 {
-  uri_tcp_test_main_t *utm = &uri_tcp_test_main;
+  echo_main_t *em = &echo_main;
 
   if (mp->retval)
     {
       clib_warning ("bind failed: %U", format_api_error,
                    clib_net_to_host_u32 (mp->retval));
-      utm->state = STATE_FAILED;
+      em->state = STATE_FAILED;
       return;
     }
 
-  utm->state = STATE_READY;
+  em->state = STATE_READY;
 }
 
 static void
 vl_api_unbind_uri_reply_t_handler (vl_api_unbind_uri_reply_t * mp)
 {
-  uri_tcp_test_main_t *utm = &uri_tcp_test_main;
+  echo_main_t *em = &echo_main;
 
   if (mp->retval != 0)
     clib_warning ("returned %d", ntohl (mp->retval));
 
-  utm->state = STATE_START;
+  em->state = STATE_START;
 }
 
 u8 *
@@ -898,186 +1163,112 @@ format_ip46_address (u8 * s, va_list * args)
 }
 
 static void
-vl_api_accept_session_t_handler (vl_api_accept_session_t * mp)
-{
-  uri_tcp_test_main_t *utm = &uri_tcp_test_main;
-  vl_api_accept_session_reply_t *rmp;
-  svm_fifo_t *rx_fifo, *tx_fifo;
-  session_t *session;
-  static f64 start_time;
-  u32 session_index;
-  u8 *ip_str;
-
-  if (start_time == 0.0)
-    start_time = clib_time_now (&utm->clib_time);
-
-  ip_str = format (0, "%U", format_ip46_address, &mp->ip, mp->is_ip4);
-  clib_warning ("Accepted session from: %s:%d", ip_str,
-               clib_net_to_host_u16 (mp->port));
-  utm->vpp_event_queue =
-    uword_to_pointer (mp->vpp_event_queue_address,
-                     unix_shared_memory_queue_t *);
-
-  /* Allocate local session and set it up */
-  pool_get (utm->sessions, session);
-  session_index = session - utm->sessions;
-
-  rx_fifo = uword_to_pointer (mp->server_rx_fifo, svm_fifo_t *);
-  rx_fifo->client_session_index = session_index;
-  tx_fifo = uword_to_pointer (mp->server_tx_fifo, svm_fifo_t *);
-  tx_fifo->client_session_index = session_index;
-
-  session->server_rx_fifo = rx_fifo;
-  session->server_tx_fifo = tx_fifo;
-
-  /* Add it to lookup table */
-  hash_set (utm->session_index_by_vpp_handles, mp->handle, session_index);
-
-  utm->state = STATE_READY;
-
-  /* Stats printing */
-  if (pool_elts (utm->sessions) && (pool_elts (utm->sessions) % 20000) == 0)
-    {
-      f64 now = clib_time_now (&utm->clib_time);
-      fformat (stdout, "%d active sessions in %.2f seconds, %.2f/sec...\n",
-              pool_elts (utm->sessions), now - start_time,
-              (f64) pool_elts (utm->sessions) / (now - start_time));
-    }
-
-  /*
-   * Send accept reply to vpp
-   */
-  rmp = vl_msg_api_alloc (sizeof (*rmp));
-  memset (rmp, 0, sizeof (*rmp));
-  rmp->_vl_msg_id = ntohs (VL_API_ACCEPT_SESSION_REPLY);
-  rmp->handle = mp->handle;
-  rmp->context = mp->context;
-  vl_msg_api_send_shmem (utm->vl_input_queue, (u8 *) & rmp);
-
-  session->bytes_received = 0;
-  session->start = clib_time_now (&utm->clib_time);
-}
-
-void
-server_handle_fifo_event_rx (uri_tcp_test_main_t * utm,
-                            session_fifo_event_t * e)
+server_handle_fifo_event_rx (echo_main_t * em, session_event_t * e)
 {
   svm_fifo_t *rx_fifo, *tx_fifo;
   int n_read;
-  session_fifo_event_t evt;
-  unix_shared_memory_queue_t *q;
   session_t *session;
   int rv;
   u32 max_dequeue, offset, max_transfer, rx_buf_len;
 
-  rx_buf_len = vec_len (utm->rx_buf);
+  rx_buf_len = vec_len (em->rx_buf);
   rx_fifo = e->fifo;
-  session = &utm->sessions[rx_fifo->client_session_index];
+  session = pool_elt_at_index (em->sessions, rx_fifo->client_session_index);
   tx_fifo = session->server_tx_fifo;
 
   max_dequeue = svm_fifo_max_dequeue (rx_fifo);
   /* Allow enqueuing of a new event */
   svm_fifo_unset_event (rx_fifo);
 
-  if (PREDICT_FALSE (max_dequeue == 0))
-    {
-      return;
-    }
+  if (PREDICT_FALSE (!max_dequeue))
+    return;
 
   /* Read the max_dequeue */
   do
     {
       max_transfer = clib_min (rx_buf_len, max_dequeue);
-      n_read = svm_fifo_dequeue_nowait (rx_fifo, max_transfer, utm->rx_buf);
+      n_read = svm_fifo_dequeue_nowait (rx_fifo, max_transfer, em->rx_buf);
       if (n_read > 0)
        {
          max_dequeue -= n_read;
          session->bytes_received += n_read;
+         session->bytes_to_receive -= n_read;
        }
 
       /* Reflect if a non-drop session */
-      if (!utm->drop_packets && n_read > 0)
+      if (!em->no_return && n_read > 0)
        {
          offset = 0;
          do
            {
              rv = svm_fifo_enqueue_nowait (tx_fifo, n_read,
-                                           &utm->rx_buf[offset]);
+                                           &em->rx_buf[offset]);
              if (rv > 0)
                {
                  n_read -= rv;
                  offset += rv;
                }
            }
-         while ((rv <= 0 || n_read > 0) && !utm->time_to_stop);
+         while ((rv <= 0 || n_read > 0) && !em->time_to_stop);
 
          /* If event wasn't set, add one */
          if (svm_fifo_set_event (tx_fifo))
-           {
-             /* Fabricate TX event, send to vpp */
-             evt.fifo = tx_fifo;
-             evt.event_type = FIFO_EVENT_APP_TX;
-
-             q = utm->vpp_event_queue;
-             unix_shared_memory_queue_add (q, (u8 *) & evt,
-                                           1 /* do wait for mutex */ );
-           }
+           app_send_io_evt_to_vpp (session->vpp_evt_q, tx_fifo,
+                                   FIFO_EVENT_APP_TX, SVM_Q_WAIT);
        }
     }
-  while ((n_read < 0 || max_dequeue > 0) && !utm->time_to_stop);
+  while ((n_read < 0 || max_dequeue > 0) && !em->time_to_stop);
 }
 
-void
-server_handle_event_queue (uri_tcp_test_main_t * utm)
+static void
+server_handle_event_queue (echo_main_t * em)
 {
-  session_fifo_event_t _e, *e = &_e;
+  svm_msg_q_msg_t msg;
+  session_event_t *e;
 
   while (1)
     {
-      unix_shared_memory_queue_sub (utm->our_event_queue, (u8 *) e,
-                                   0 /* nowait */ );
+      svm_msg_q_sub (em->our_event_queue, &msg, SVM_Q_WAIT, 0);
+      e = svm_msg_q_msg_data (em->our_event_queue, &msg);
       switch (e->event_type)
        {
        case FIFO_EVENT_APP_RX:
-         server_handle_fifo_event_rx (utm, e);
+         server_handle_fifo_event_rx (em, e);
          break;
-
-       case FIFO_EVENT_DISCONNECT:
-         return;
-
        default:
-         clib_warning ("unknown event type %d", e->event_type);
+         handle_mq_event (e);
          break;
        }
-      if (PREDICT_FALSE (utm->time_to_stop == 1))
+      if (PREDICT_FALSE (em->time_to_stop == 1))
        break;
-      if (PREDICT_FALSE (utm->time_to_print_stats == 1))
+      if (PREDICT_FALSE (em->time_to_print_stats == 1))
        {
-         utm->time_to_print_stats = 0;
-         fformat (stdout, "%d connections\n", pool_elts (utm->sessions));
+         em->time_to_print_stats = 0;
+         fformat (stdout, "%d connections\n", pool_elts (em->sessions));
        }
+      svm_msg_q_free_msg (em->our_event_queue, &msg);
     }
 }
 
 void
-server_send_listen (uri_tcp_test_main_t * utm)
+server_send_listen (echo_main_t * em)
 {
   vl_api_bind_uri_t *bmp;
   bmp = vl_msg_api_alloc (sizeof (*bmp));
   memset (bmp, 0, sizeof (*bmp));
 
   bmp->_vl_msg_id = ntohs (VL_API_BIND_URI);
-  bmp->client_index = utm->my_client_index;
+  bmp->client_index = em->my_client_index;
   bmp->context = ntohl (0xfeedface);
-  memcpy (bmp->uri, utm->uri, vec_len (utm->uri));
-  vl_msg_api_send_shmem (utm->vl_input_queue, (u8 *) & bmp);
+  memcpy (bmp->uri, em->uri, vec_len (em->uri));
+  vl_msg_api_send_shmem (em->vl_input_queue, (u8 *) & bmp);
 }
 
 int
-server_listen (uri_tcp_test_main_t * utm)
+server_listen (echo_main_t * em)
 {
-  server_send_listen (utm);
-  if (wait_for_state_change (utm, STATE_READY))
+  server_send_listen (em);
+  if (wait_for_state_change (em, STATE_READY))
     {
       clib_warning ("timeout waiting for STATE_READY");
       return -1;
@@ -1086,7 +1277,7 @@ server_listen (uri_tcp_test_main_t * utm)
 }
 
 void
-server_send_unbind (uri_tcp_test_main_t * utm)
+server_send_unbind (echo_main_t * em)
 {
   vl_api_unbind_uri_t *ump;
 
@@ -1094,16 +1285,16 @@ server_send_unbind (uri_tcp_test_main_t * utm)
   memset (ump, 0, sizeof (*ump));
 
   ump->_vl_msg_id = ntohs (VL_API_UNBIND_URI);
-  ump->client_index = utm->my_client_index;
-  memcpy (ump->uri, utm->uri, vec_len (utm->uri));
-  vl_msg_api_send_shmem (utm->vl_input_queue, (u8 *) & ump);
+  ump->client_index = em->my_client_index;
+  memcpy (ump->uri, em->uri, vec_len (em->uri));
+  vl_msg_api_send_shmem (em->vl_input_queue, (u8 *) & ump);
 }
 
 int
-server_unbind (uri_tcp_test_main_t * utm)
+server_unbind (echo_main_t * em)
 {
-  server_send_unbind (utm);
-  if (wait_for_state_change (utm, STATE_START))
+  server_send_unbind (em);
+  if (wait_for_state_change (em, STATE_START))
     {
       clib_warning ("timeout waiting for STATE_START");
       return -1;
@@ -1112,7 +1303,7 @@ server_unbind (uri_tcp_test_main_t * utm)
 }
 
 void
-server_run (uri_tcp_test_main_t * utm)
+server_run (echo_main_t * em)
 {
   session_t *session;
   int i;
@@ -1120,26 +1311,26 @@ server_run (uri_tcp_test_main_t * utm)
   /* $$$$ hack preallocation */
   for (i = 0; i < 200000; i++)
     {
-      pool_get (utm->sessions, session);
+      pool_get (em->sessions, session);
       memset (session, 0, sizeof (*session));
     }
   for (i = 0; i < 200000; i++)
-    pool_put_index (utm->sessions, i);
+    pool_put_index (em->sessions, i);
 
-  if (application_attach (utm))
+  if (application_attach (em))
     return;
 
   /* Bind to uri */
-  if (server_listen (utm))
+  if (server_listen (em))
     return;
 
   /* Enter handle event loop */
-  server_handle_event_queue (utm);
+  server_handle_event_queue (em);
 
   /* Cleanup */
-  server_send_unbind (utm);
+  server_send_unbind (em);
 
-  application_detach (utm);
+  application_detach (em);
 
   fformat (stdout, "Test complete...\n");
 }
@@ -1148,35 +1339,57 @@ static void
 vl_api_disconnect_session_reply_t_handler (vl_api_disconnect_session_reply_t *
                                           mp)
 {
-  uri_tcp_test_main_t *utm = &uri_tcp_test_main;
-  session_t *session;
+  echo_main_t *em = &echo_main;
+  uword *p;
 
   if (mp->retval)
     {
       clib_warning ("vpp complained about disconnect: %d",
                    ntohl (mp->retval));
+      return;
     }
 
-  utm->state = STATE_START;
-  session = pool_elt_at_index (utm->sessions, utm->connected_session_index);
-  if (session)
-    session_print_stats (utm, session);
+  em->state = STATE_START;
+
+  p = hash_get (em->session_index_by_vpp_handles, mp->handle);
+  if (p)
+    {
+      hash_unset (em->session_index_by_vpp_handles, mp->handle);
+    }
+  else
+    {
+      clib_warning ("couldn't find session key %llx", mp->handle);
+    }
 }
 
-#define foreach_uri_msg                                        \
-_(BIND_URI_REPLY, bind_uri_reply)                              \
-_(UNBIND_URI_REPLY, unbind_uri_reply)                          \
-_(ACCEPT_SESSION, accept_session)                              \
-_(CONNECT_SESSION_REPLY, connect_session_reply)                \
-_(DISCONNECT_SESSION, disconnect_session)                      \
-_(DISCONNECT_SESSION_REPLY, disconnect_session_reply)          \
-_(RESET_SESSION, reset_session)                                \
-_(APPLICATION_ATTACH_REPLY, application_attach_reply)          \
-_(APPLICATION_DETACH_REPLY, application_detach_reply)          \
-_(MAP_ANOTHER_SEGMENT, map_another_segment)                    \
+static void
+  vl_api_application_tls_cert_add_reply_t_handler
+  (vl_api_application_tls_cert_add_reply_t * mp)
+{
+  if (mp->retval)
+    clib_warning ("failed to add tls cert");
+}
+
+static void
+  vl_api_application_tls_key_add_reply_t_handler
+  (vl_api_application_tls_key_add_reply_t * mp)
+{
+  if (mp->retval)
+    clib_warning ("failed to add tls key");
+}
+
+#define foreach_tcp_echo_msg                                           \
+_(BIND_URI_REPLY, bind_uri_reply)                                      \
+_(UNBIND_URI_REPLY, unbind_uri_reply)                                  \
+_(DISCONNECT_SESSION_REPLY, disconnect_session_reply)                  \
+_(APPLICATION_ATTACH_REPLY, application_attach_reply)                  \
+_(APPLICATION_DETACH_REPLY, application_detach_reply)                  \
+_(MAP_ANOTHER_SEGMENT, map_another_segment)                            \
+_(APPLICATION_TLS_CERT_ADD_REPLY, application_tls_cert_add_reply)      \
+_(APPLICATION_TLS_KEY_ADD_REPLY, application_tls_key_add_reply)                \
 
 void
-uri_api_hookup (uri_tcp_test_main_t * utm)
+tcp_echo_api_hookup (echo_main_t * em)
 {
 #define _(N,n)                                                  \
     vl_msg_api_set_handlers(VL_API_##N, #n,                     \
@@ -1185,44 +1398,38 @@ uri_api_hookup (uri_tcp_test_main_t * utm)
                            vl_api_##n##_t_endian,               \
                            vl_api_##n##_t_print,                \
                            sizeof(vl_api_##n##_t), 1);
-  foreach_uri_msg;
+  foreach_tcp_echo_msg;
 #undef _
 }
 
 int
 main (int argc, char **argv)
 {
-  uri_tcp_test_main_t *utm = &uri_tcp_test_main;
+  int i_am_server = 1, test_return_packets = 0;
+  echo_main_t *em = &echo_main;
   unformat_input_t _argv, *a = &_argv;
   u8 *chroot_prefix;
-  u8 *heap, *uri = 0;
+  u8 *uri = 0;
   u8 *bind_uri = (u8 *) "tcp://0.0.0.0/1234";
-  u8 *connect_uri = (u8 *) "tcp://6.0.1.2/1234";
+  u8 *connect_uri = (u8 *) "tcp://6.0.1.1/1234";
   u64 bytes_to_send = 64 << 10, mbytes;
+  char *app_name;
   u32 tmp;
-  mheap_t *h;
-  int i_am_master = 1, drop_packets = 0, test_return_packets = 0;
 
-  clib_mem_init (0, 256 << 20);
+  clib_mem_init_thread_safe (0, 256 << 20);
 
-  heap = clib_mem_get_per_cpu_heap ();
-  h = mheap_header (heap);
+  memset (em, 0, sizeof (*em));
+  em->session_index_by_vpp_handles = hash_create (0, sizeof (uword));
+  em->my_pid = getpid ();
+  em->configured_segment_size = 1 << 20;
+  em->socket_name = 0;
+  em->use_sock_api = 1;
+  em->fifo_size = 64 << 10;
+  em->n_clients = 1;
 
-  /* make the main heap thread-safe */
-  h->flags |= MHEAP_FLAG_THREAD_SAFE;
-
-  vec_validate (utm->rx_buf, 128 << 10);
-
-  utm->session_index_by_vpp_handles = hash_create (0, sizeof (uword));
-
-  utm->my_pid = getpid ();
-  utm->configured_segment_size = 1 << 20;
-  utm->socket_name = 0;
-  utm->use_sock_api = 1;
-
-  clib_time_init (&utm->clib_time);
-  init_error_string_table (utm);
-  svm_fifo_segment_init (0x200000000ULL, 20);
+  clib_time_init (&em->clib_time);
+  init_error_string_table (em);
+  svm_fifo_segment_main_init (0x200000000ULL, 20);
   unformat_init_command_line (a, argv);
 
   while (unformat_check_input (a) != UNFORMAT_END_OF_INPUT)
@@ -1234,15 +1441,15 @@ main (int argc, char **argv)
       else if (unformat (a, "uri %s", &uri))
        ;
       else if (unformat (a, "segment-size %dM", &tmp))
-       utm->configured_segment_size = tmp << 20;
+       em->configured_segment_size = tmp << 20;
       else if (unformat (a, "segment-size %dG", &tmp))
-       utm->configured_segment_size = tmp << 30;
-      else if (unformat (a, "master"))
-       i_am_master = 1;
-      else if (unformat (a, "slave"))
-       i_am_master = 0;
-      else if (unformat (a, "drop"))
-       drop_packets = 1;
+       em->configured_segment_size = tmp << 30;
+      else if (unformat (a, "server"))
+       i_am_server = 1;
+      else if (unformat (a, "client"))
+       i_am_server = 0;
+      else if (unformat (a, "no-return"))
+       em->no_return = 1;
       else if (unformat (a, "test"))
        test_return_packets = 1;
       else if (unformat (a, "mbytes %lld", &mbytes))
@@ -1253,55 +1460,64 @@ main (int argc, char **argv)
        {
          bytes_to_send = mbytes << 30;
        }
-      else if (unformat (a, "socket-name %s", &utm->socket_name))
+      else if (unformat (a, "socket-name %s", &em->socket_name))
        ;
       else if (unformat (a, "use-svm-api"))
-       utm->use_sock_api = 0;
+       em->use_sock_api = 0;
+      else if (unformat (a, "fifo-size %d", &tmp))
+       em->fifo_size = tmp << 10;
+      else if (unformat (a, "nclients %d", &em->n_clients))
+       ;
       else
        {
-         fformat (stderr, "%s: usage [master|slave]\n");
+         fformat (stderr, "%s: usage [master|slave]\n", argv[0]);
          exit (1);
        }
     }
 
-  if (!utm->socket_name)
-    utm->socket_name = format (0, "%s%c", API_SOCKET_FILE, 0);
+  if (!em->socket_name)
+    em->socket_name = format (0, "%s%c", API_SOCKET_FILE, 0);
 
   if (uri)
     {
-      utm->uri = format (0, "%s%c", uri, 0);
-      utm->connect_uri = format (0, "%s%c", uri, 0);
+      em->uri = format (0, "%s%c", uri, 0);
+      em->connect_uri = format (0, "%s%c", uri, 0);
     }
   else
     {
-      utm->uri = format (0, "%s%c", bind_uri, 0);
-      utm->connect_uri = format (0, "%s%c", connect_uri, 0);
+      em->uri = format (0, "%s%c", bind_uri, 0);
+      em->connect_uri = format (0, "%s%c", connect_uri, 0);
     }
 
-  utm->i_am_master = i_am_master;
-  utm->segment_main = &svm_fifo_segment_main;
-  utm->drop_packets = drop_packets;
-  utm->test_return_packets = test_return_packets;
-  utm->bytes_to_send = bytes_to_send;
-  utm->time_to_stop = 0;
+  em->i_am_master = i_am_server;
+  em->segment_main = &svm_fifo_segment_main;
+  em->test_return_packets = test_return_packets;
+  em->bytes_to_send = bytes_to_send;
+  em->time_to_stop = 0;
+  vec_validate (em->rx_buf, 128 << 10);
+  vec_validate (em->client_thread_handles, em->n_clients - 1);
+  vec_validate (em->thread_args, em->n_clients - 1);
 
   setup_signal_handlers ();
-  uri_api_hookup (utm);
+  tcp_echo_api_hookup (em);
 
-  if (connect_to_vpp (i_am_master ? "tcp_echo_server" : "tcp_echo_client") <
-      0)
+  app_name = i_am_server ? "tcp_echo_server" : "tcp_echo_client";
+  if (connect_to_vpp (app_name) < 0)
     {
       svm_region_exit ();
       fformat (stderr, "Couldn't connect to vpe, exiting...\n");
       exit (1);
     }
 
-  if (i_am_master == 0)
-    client_run (utm);
+  if (i_am_server == 0)
+    clients_run (em);
   else
-    server_run (utm);
+    server_run (em);
+
+  /* Make sure detach finishes */
+  wait_for_state_change (em, STATE_DETACHED);
 
-  disconnect_from_vpp (utm);
+  disconnect_from_vpp (em);
   exit (0);
 }