udp_echo: fix cut-through server mode

Change-Id: I20dd2071c936eb2c1870d45860553007c8e20587
Signed-off-by: Florin Coras <fcoras@cisco.com>

1 files changed, 217 insertions, 206 deletions

diff --git a/src/tests/vnet/session/udp_echo.c b/src/tests/vnet/session/udp_echo.c
index 5691ca4f042..9872eed27ba 100644
--- a/src/tests/vnet/session/udp_echo.c
+++ b/src/tests/vnet/session/udp_echo.c
@@ -90,6 +90,7 @@ typedef struct
 
   /* Our event queue */
   svm_msg_q_t *our_event_queue;
+  svm_msg_q_t *ct_event_queue;
 
   /* $$$ single thread only for the moment */
   svm_msg_q_t *vpp_event_queue;
@@ -128,15 +129,11 @@ typedef struct
   uword *segments_table;
   u8 do_echo;
   u8 have_return;
+  u64 total_to_send;
   u64 bytes_to_send;
+  u64 bytes_sent;
 } udp_echo_main_t;
 
-#if CLIB_DEBUG > 0
-#define NITER 10000
-#else
-#define NITER 4000000
-#endif
-
 udp_echo_main_t udp_echo_main;
 
 static void
@@ -371,8 +368,8 @@ vl_api_application_attach_reply_t_handler (vl_api_application_attach_reply_t *
       return;
     }
 
-  utm->our_event_queue =
-    uword_to_pointer (mp->app_event_queue_address, svm_msg_q_t *);
+  utm->our_event_queue = uword_to_pointer (mp->app_event_queue_address,
+					   svm_msg_q_t *);
   utm->state = STATE_ATTACHED;
 }
 
@@ -416,6 +413,8 @@ wait_for_state_change (udp_echo_main_t * utm, connection_state_t state)
     {
       if (utm->state == state)
 	return 0;
+      if (utm->state == STATE_FAILED)
+	return -1;
     }
   return -1;
 }
@@ -431,7 +430,7 @@ cut_through_thread_fn (void *arg)
   u8 *my_copy_buffer = 0;
   udp_echo_main_t *utm = &udp_echo_main;
   i32 actual_transfer;
-  int rv;
+  int rv, do_dequeue = 0;
   u32 buffer_offset;
 
   while (utm->cut_through_session_index == ~0)
@@ -444,31 +443,42 @@ cut_through_thread_fn (void *arg)
 
   vec_validate (my_copy_buffer, 64 * 1024 - 1);
 
-  while (true)
+  while (1)
     {
-      /* We read from the tx fifo and write to the rx fifo */
       do
 	{
-	  actual_transfer = svm_fifo_dequeue_nowait (rx_fifo,
-						     vec_len (my_copy_buffer),
-						     my_copy_buffer);
+	  /* We read from the tx fifo and write to the rx fifo */
+	  if (utm->have_return || do_dequeue)
+	    actual_transfer = svm_fifo_dequeue_nowait (rx_fifo,
+						       vec_len
+						       (my_copy_buffer),
+						       my_copy_buffer);
+	  else
+	    {
+	      /* We don't do anything with the data, drop it */
+	      actual_transfer = svm_fifo_max_dequeue (rx_fifo);
+	      svm_fifo_dequeue_drop (rx_fifo, actual_transfer);
+	    }
 	}
       while (actual_transfer <= 0);
 
       server_bytes_received += actual_transfer;
 
-      buffer_offset = 0;
-      while (actual_transfer > 0)
+      if (utm->have_return)
 	{
-	  rv = svm_fifo_enqueue_nowait (tx_fifo, actual_transfer,
-					my_copy_buffer + buffer_offset);
-	  if (rv > 0)
+	  buffer_offset = 0;
+	  while (actual_transfer > 0)
 	    {
-	      actual_transfer -= rv;
-	      buffer_offset += rv;
-	      server_bytes_sent += rv;
-	    }
+	      rv = svm_fifo_enqueue_nowait (tx_fifo, actual_transfer,
+					    my_copy_buffer + buffer_offset);
+	      if (rv > 0)
+		{
+		  actual_transfer -= rv;
+		  buffer_offset += rv;
+		  server_bytes_sent += rv;
+		}
 
+	    }
 	}
       if (PREDICT_FALSE (utm->time_to_stop))
 	break;
@@ -500,18 +510,21 @@ session_accepted_handler (session_accepted_msg_t * mp)
   pool_get (utm->sessions, session);
   memset (session, 0, sizeof (*session));
   session_index = session - utm->sessions;
+  session->session_index = session_index;
 
   /* Cut-through case */
   if (mp->server_event_queue_address)
     {
       clib_warning ("cut-through session");
-      utm->our_event_queue = uword_to_pointer (mp->server_event_queue_address,
-					       svm_msg_q_t *);
+      session->vpp_evt_q = uword_to_pointer (mp->client_event_queue_address,
+					     svm_msg_q_t *);
+      sleep (1);
       rx_fifo->master_session_index = session_index;
       tx_fifo->master_session_index = session_index;
       utm->cut_through_session_index = session_index;
       session->rx_fifo = rx_fifo;
       session->tx_fifo = tx_fifo;
+      session->is_dgram = 0;
 
       rv = pthread_create (&utm->cut_through_thread_handle,
 			   NULL /*attr */ , cut_through_thread_fn, 0);
@@ -520,7 +533,6 @@ session_accepted_handler (session_accepted_msg_t * mp)
 	  clib_warning ("pthread_create returned %d", rv);
 	  rv = VNET_API_ERROR_SYSCALL_ERROR_1;
 	}
-      utm->do_echo = 1;
     }
   else
     {
@@ -543,13 +555,13 @@ session_accepted_handler (session_accepted_msg_t * mp)
 	       (f64) pool_elts (utm->sessions) / (now - start_time));
     }
 
-  app_alloc_ctrl_evt_to_vpp (session->vpp_evt_q, app_evt,
+  app_alloc_ctrl_evt_to_vpp (utm->vpp_event_queue, 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;
   rmp->retval = rv;
-  app_send_ctrl_evt_to_vpp (session->vpp_evt_q, app_evt);
+  app_send_ctrl_evt_to_vpp (utm->vpp_event_queue, app_evt);
 
   CLIB_MEMORY_BARRIER ();
   utm->state = STATE_READY;
@@ -571,6 +583,7 @@ session_disconnected_handler (session_disconnected_msg_t * mp)
     {
       session = pool_elt_at_index (utm->sessions, p[0]);
       hash_unset (utm->session_index_by_vpp_handles, mp->handle);
+      clib_warning ("disconnecting %u", session->session_index);
       pool_put (utm->sessions, session);
     }
   else
@@ -607,27 +620,32 @@ session_connected_handler (session_connected_msg_t * mp)
   ASSERT (mp->server_rx_fifo && mp->server_tx_fifo);
 
   pool_get (utm->sessions, session);
+  session->session_index = session - utm->sessions;
   session->rx_fifo = uword_to_pointer (mp->server_rx_fifo, svm_fifo_t *);
   session->tx_fifo = uword_to_pointer (mp->server_tx_fifo, svm_fifo_t *);
-  session->vpp_evt_q = uword_to_pointer (mp->vpp_event_queue_address,
-					 svm_msg_q_t *);
+
   /* Cut-through case */
   if (mp->client_event_queue_address)
     {
       clib_warning ("cut-through session");
-      utm->cut_through_session_index = session - utm->sessions;
-      utm->vpp_event_queue = uword_to_pointer (mp->vpp_event_queue_address,
-					       svm_msg_q_t *);
-      utm->our_event_queue = uword_to_pointer (mp->client_event_queue_address,
-					       svm_msg_q_t *);
-      utm->do_echo = 1;
+      session->vpp_evt_q = uword_to_pointer (mp->server_event_queue_address,
+					     svm_msg_q_t *);
+      utm->ct_event_queue = uword_to_pointer (mp->client_event_queue_address,
+					      svm_msg_q_t *);
+      utm->cut_through_session_index = session->session_index;
+      session->is_dgram = 0;
+      sleep (1);
+      session->rx_fifo->client_session_index = session->session_index;
+      session->tx_fifo->client_session_index = session->session_index;
     }
   else
     {
-      utm->connected_session = session - utm->sessions;
+      utm->connected_session = session->session_index;
       utm->vpp_event_queue = uword_to_pointer (mp->vpp_event_queue_address,
 					       svm_msg_q_t *);
 
+      session->rx_fifo->client_session_index = session->session_index;
+      session->tx_fifo->client_session_index = session->session_index;
       clib_memcpy (&session->transport.lcl_ip, mp->lcl_ip,
 		   sizeof (ip46_address_t));
       session->transport.is_ip4 = mp->is_ip4;
@@ -651,10 +669,48 @@ session_connected_handler (session_connected_msg_t * mp)
 }
 
 static void
+session_bound_handler (session_bound_msg_t * mp)
+{
+  udp_echo_main_t *utm = &udp_echo_main;
+  svm_fifo_t *rx_fifo, *tx_fifo;
+  app_session_t *session;
+  u32 session_index;
+
+  if (mp->retval)
+    {
+      clib_warning ("bind failed: %d", mp->retval);
+      utm->state = STATE_FAILED;
+      return;
+    }
+
+  rx_fifo = uword_to_pointer (mp->rx_fifo, svm_fifo_t *);
+  tx_fifo = uword_to_pointer (mp->tx_fifo, svm_fifo_t *);
+
+  pool_get (utm->sessions, session);
+  memset (session, 0, sizeof (*session));
+  session_index = session - utm->sessions;
+
+  rx_fifo->client_session_index = session_index;
+  tx_fifo->client_session_index = session_index;
+  session->rx_fifo = rx_fifo;
+  session->tx_fifo = tx_fifo;
+  clib_memcpy (&session->transport.lcl_ip, mp->lcl_ip,
+	       sizeof (ip46_address_t));
+  session->transport.is_ip4 = mp->lcl_is_ip4;
+  session->transport.lcl_port = mp->lcl_port;
+  session->vpp_evt_q = uword_to_pointer (mp->vpp_evt_q, svm_msg_q_t *);
+
+  utm->state = utm->is_connected ? STATE_BOUND : STATE_READY;
+}
+
+static void
 handle_mq_event (session_event_t * e)
 {
   switch (e->event_type)
     {
+    case SESSION_CTRL_EVT_BOUND:
+      session_bound_handler ((session_bound_msg_t *) e->data);
+      break;
     case SESSION_CTRL_EVT_ACCEPTED:
       session_accepted_handler ((session_accepted_msg_t *) e->data);
       break;
@@ -684,134 +740,36 @@ udp_client_send_connect (udp_echo_main_t * utm)
 }
 
 static void
-client_send_cut_through (udp_echo_main_t * utm, app_session_t * session)
-{
-  int i;
-  u8 *test_data = 0;
-  u64 bytes_received = 0, bytes_sent = 0;
-  i32 bytes_to_read;
-  int rv;
-  f64 before, after, delta, bytes_per_second;
-  svm_fifo_t *rx_fifo, *tx_fifo;
-  int buffer_offset, bytes_to_send = 0;
-
-  /*
-   * Prepare test data
-   */
-  vec_validate (test_data, 64 * 1024 - 1);
-  for (i = 0; i < vec_len (test_data); i++)
-    test_data[i] = i & 0xff;
-
-  rx_fifo = session->rx_fifo;
-  tx_fifo = session->tx_fifo;
-
-  before = clib_time_now (&utm->clib_time);
-
-  vec_validate (utm->rx_buf, vec_len (test_data) - 1);
-
-  for (i = 0; i < NITER; i++)
-    {
-      bytes_to_send = vec_len (test_data);
-      buffer_offset = 0;
-      while (bytes_to_send > 0)
-	{
-	  rv = svm_fifo_enqueue_nowait (tx_fifo, bytes_to_send,
-					test_data + buffer_offset);
-
-	  if (rv > 0)
-	    {
-	      bytes_to_send -= rv;
-	      buffer_offset += rv;
-	      bytes_sent += rv;
-	    }
-	}
-
-      bytes_to_read = svm_fifo_max_dequeue (rx_fifo);
-      bytes_to_read = vec_len (utm->rx_buf) > bytes_to_read ?
-	bytes_to_read : vec_len (utm->rx_buf);
-
-      buffer_offset = 0;
-      while (bytes_to_read > 0)
-	{
-	  rv = svm_fifo_dequeue_nowait (rx_fifo,
-					bytes_to_read,
-					utm->rx_buf + buffer_offset);
-	  if (rv > 0)
-	    {
-	      bytes_to_read -= rv;
-	      buffer_offset += rv;
-	      bytes_received += rv;
-	    }
-	}
-    }
-  while (bytes_received < bytes_sent)
-    {
-      rv =
-	svm_fifo_dequeue_nowait (rx_fifo, vec_len (utm->rx_buf), utm->rx_buf);
-      if (rv > 0)
-	{
-#if CLIB_DEBUG > 0
-	  int j;
-	  for (j = 0; j < rv; j++)
-	    {
-	      if (utm->rx_buf[j] != ((bytes_received + j) & 0xff))
-		{
-		  clib_warning ("error at byte %lld, 0x%x not 0x%x",
-				bytes_received + j,
-				utm->rx_buf[j],
-				((bytes_received + j) & 0xff));
-		}
-	    }
-#endif
-	  bytes_received += (u64) rv;
-	}
-    }
-
-  after = clib_time_now (&utm->clib_time);
-  delta = after - before;
-  bytes_per_second = 0.0;
-
-  if (delta > 0.0)
-    bytes_per_second = (f64) bytes_received / delta;
-
-  fformat (stdout,
-	   "Done: %lld recv bytes in %.2f seconds, %.2f bytes/sec...\n\n",
-	   bytes_received, delta, bytes_per_second);
-  fformat (stdout,
-	   "Done: %lld sent bytes in %.2f seconds, %.2f bytes/sec...\n\n",
-	   bytes_sent, delta, bytes_per_second);
-  fformat (stdout,
-	   "client -> server -> client round trip: %.2f Gbit/sec \n\n",
-	   (bytes_per_second * 8.0) / 1e9);
-}
-
-static void
 send_test_chunk (udp_echo_main_t * utm, app_session_t * s, u32 bytes)
 {
+  u64 test_buf_len, bytes_this_chunk, test_buf_offset;
+
   u8 *test_data = utm->connect_test_data;
-  int test_buf_offset = 0;
-  u64 bytes_sent = 0;
   u32 bytes_to_snd, enq_space, min_chunk;
-  int rv;
-
-  min_chunk = clib_min (65536, s->tx_fifo->nitems);
-  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);
+  session_evt_type_t et = FIFO_EVENT_APP_TX;
+  int written;
+
+  test_buf_len = vec_len (test_data);
+  test_buf_offset = utm->bytes_sent % test_buf_len;
+  bytes_this_chunk = clib_min (test_buf_len - test_buf_offset,
+			       utm->bytes_to_send);
+  enq_space = svm_fifo_max_enqueue (s->tx_fifo);
+  bytes_this_chunk = clib_min (bytes_this_chunk, enq_space);
+  et += (s->session_index == utm->cut_through_session_index);
+
+  if (s->is_dgram)
+    written = app_send_dgram_raw (s->tx_fifo, &s->transport, s->vpp_evt_q,
+				  test_data + test_buf_offset,
+				  bytes_this_chunk, et, SVM_Q_WAIT);
+  else
+    written = app_send_stream_raw (s->tx_fifo, s->vpp_evt_q,
+				   test_data + test_buf_offset,
+				   bytes_this_chunk, et, SVM_Q_WAIT);
 
-  while (bytes_to_snd > 0 && !utm->time_to_stop)
+  if (written > 0)
     {
-      enq_space = svm_fifo_max_enqueue (s->tx_fifo);
-      if (enq_space < clib_min (bytes_to_snd, min_chunk))
-	continue;
-
-      rv = app_send (s, test_data + test_buf_offset, bytes_to_snd, 0);
-      if (rv > 0)
-	{
-	  bytes_to_snd -= rv;
-	  test_buf_offset += rv;
-	  bytes_sent += rv;
-	}
+      utm->bytes_to_send -= written;
+      utm->bytes_sent += written;
     }
 }
 
@@ -822,30 +780,27 @@ recv_test_chunk (udp_echo_main_t * utm, app_session_t * s)
 }
 
 void
-client_send_data (udp_echo_main_t * utm)
+client_send_data (udp_echo_main_t * utm, u32 session_index)
 {
   f64 start_time, end_time, delta;
   app_session_t *session;
   char *transfer_type;
-  u32 n_iterations;
   u8 *test_data;
   int i;
 
-  vec_validate (utm->connect_test_data, 1024 * 1024 - 1);
+  vec_validate_aligned (utm->connect_test_data, 1024 * 1024 - 1,
+			CLIB_CACHE_LINE_BYTES);
   for (i = 0; i < vec_len (utm->connect_test_data); i++)
     utm->connect_test_data[i] = i & 0xff;
 
   test_data = utm->connect_test_data;
-  session = pool_elt_at_index (utm->sessions, utm->connected_session);
+  session = pool_elt_at_index (utm->sessions, session_index);
   ASSERT (vec_len (test_data) > 0);
 
+  utm->total_to_send = utm->bytes_to_send;
   vec_validate (utm->rx_buf, vec_len (test_data) - 1);
-  n_iterations = utm->bytes_to_send / vec_len (test_data);
-  if (!n_iterations)
-    n_iterations = 1;
-
   start_time = clib_time_now (&utm->clib_time);
-  for (i = 0; i < n_iterations; i++)
+  while (!utm->time_to_stop && utm->bytes_to_send)
     {
       send_test_chunk (utm, session, 0);
       if (utm->have_return)
@@ -865,12 +820,12 @@ client_send_data (udp_echo_main_t * utm)
   delta = end_time - start_time;
   transfer_type = utm->have_return ? "full-duplex" : "half-duplex";
   clib_warning ("%lld bytes (%lld mbytes, %lld gbytes) in %.2f seconds",
-		utm->bytes_to_send, utm->bytes_to_send / (1ULL << 20),
-		utm->bytes_to_send / (1ULL << 30), delta);
-  clib_warning ("%.2f bytes/second %s", ((f64) utm->bytes_to_send) / (delta),
+		utm->total_to_send, utm->total_to_send / (1ULL << 20),
+		utm->total_to_send / (1ULL << 30), delta);
+  clib_warning ("%.2f bytes/second %s", ((f64) utm->total_to_send) / (delta),
 		transfer_type);
   clib_warning ("%.4f gbit/second %s",
-		(((f64) utm->bytes_to_send * 8.0) / delta / 1e9),
+		(((f64) utm->total_to_send * 8.0) / delta / 1e9),
 		transfer_type);
 }
 
@@ -900,28 +855,21 @@ client_test (udp_echo_main_t * utm)
   udp_client_send_connect (utm);
 
   start_time = clib_time_now (&utm->clib_time);
-  while (pool_elts (utm->sessions) != 1
-	 && clib_time_now (&utm->clib_time) - start_time < timeout
-	 && utm->state != STATE_FAILED)
-
+  while (pool_elts (utm->sessions) != 1 && utm->state != STATE_FAILED)
     {
       svm_msg_q_sub (utm->our_event_queue, &msg, SVM_Q_WAIT, 0);
       e = svm_msg_q_msg_data (utm->our_event_queue, &msg);
       handle_mq_event (e);
       svm_msg_q_free_msg (utm->our_event_queue, &msg);
+
+      if (clib_time_now (&utm->clib_time) - start_time >= timeout)
+	break;
     }
 
   if (utm->cut_through_session_index != ~0)
-    {
-      session = pool_elt_at_index (utm->sessions,
-				   utm->cut_through_session_index);
-      client_send_cut_through (utm, session);
-    }
+    client_send_data (utm, utm->cut_through_session_index);
   else
-    {
-      session = pool_elt_at_index (utm->sessions, utm->connected_session);
-      client_send_data (utm);
-    }
+    client_send_data (utm, utm->connected_session);
 
   application_detach (utm);
   wait_for_state_change (utm, STATE_DETACHED);
@@ -1024,13 +972,21 @@ vl_api_unbind_uri_reply_t_handler (vl_api_unbind_uri_reply_t * mp)
   utm->state = STATE_START;
 }
 
-#define foreach_tcp_echo_msg                         	\
-_(BIND_URI_REPLY, bind_uri_reply)               	\
-_(UNBIND_URI_REPLY, unbind_uri_reply)           	\
-_(MAP_ANOTHER_SEGMENT, map_another_segment)		\
-_(UNMAP_SEGMENT, unmap_segment)				\
-_(APPLICATION_ATTACH_REPLY, application_attach_reply)	\
-_(APPLICATION_DETACH_REPLY, application_detach_reply)	\
+static void
+  vl_api_app_cut_through_registration_add_t_handler
+  (vl_api_app_cut_through_registration_add_t * mp)
+{
+
+}
+
+#define foreach_tcp_echo_msg                         			\
+_(BIND_URI_REPLY, bind_uri_reply)               			\
+_(UNBIND_URI_REPLY, unbind_uri_reply)           			\
+_(MAP_ANOTHER_SEGMENT, map_another_segment)				\
+_(UNMAP_SEGMENT, unmap_segment)						\
+_(APPLICATION_ATTACH_REPLY, application_attach_reply)			\
+_(APPLICATION_DETACH_REPLY, application_detach_reply)			\
+_(APP_CUT_THROUGH_REGISTRATION_ADD, app_cut_through_registration_add)	\
 
 void
 tcp_echo_api_hookup (udp_echo_main_t * utm)
@@ -1081,52 +1037,107 @@ init_error_string_table (udp_echo_main_t * utm)
 }
 
 void
-server_handle_fifo_event_rx (udp_echo_main_t * utm, session_event_t * e)
+server_handle_fifo_event_rx (udp_echo_main_t * utm, u32 session_index)
 {
-  app_session_t *s;
+  svm_fifo_t *rx_fifo, *tx_fifo;
+  int n_read;
+  app_session_t *session;
   int rv;
+  u32 max_dequeue, offset, max_transfer, rx_buf_len;
+  session_evt_type_t et = FIFO_EVENT_APP_TX;
 
-  s = pool_elt_at_index (utm->sessions, e->fifo->client_session_index);
-  app_recv (s, utm->rx_buf, vec_len (utm->rx_buf));
+  session = pool_elt_at_index (utm->sessions, session_index);
+  rx_buf_len = vec_len (utm->rx_buf);
+  rx_fifo = session->rx_fifo;
+  tx_fifo = session->tx_fifo;
+
+  et += (session->session_index == utm->cut_through_session_index);
+
+  max_dequeue = svm_fifo_max_dequeue (rx_fifo);
+  /* Allow enqueuing of a new event */
+  svm_fifo_unset_event (rx_fifo);
 
-  if (utm->do_echo)
+  if (PREDICT_FALSE (!max_dequeue))
+    return;
+
+  /* Read the max_dequeue */
+  do
     {
-      do
+      max_transfer = clib_min (rx_buf_len, max_dequeue);
+      if (session->is_dgram)
+	n_read = app_recv_dgram_raw (rx_fifo, utm->rx_buf, max_transfer,
+				     &session->transport, 0, 0);
+      else
+	n_read = app_recv_stream_raw (rx_fifo, utm->rx_buf, max_transfer, 0,
+				      0);
+
+      if (n_read > 0)
+	max_dequeue -= n_read;
+
+      /* Reflect if a non-drop session */
+      if (utm->have_return && n_read > 0)
 	{
-	  rv = app_send_stream (s, utm->rx_buf, vec_len (utm->rx_buf), 0);
+	  offset = 0;
+	  do
+	    {
+	      if (session->is_dgram)
+		rv = app_send_dgram_raw (tx_fifo, &session->transport,
+					 session->vpp_evt_q,
+					 &utm->rx_buf[offset], n_read, et,
+					 SVM_Q_WAIT);
+	      else
+		rv = app_send_stream_raw (tx_fifo, session->vpp_evt_q,
+					  &utm->rx_buf[offset], n_read, et,
+					  SVM_Q_WAIT);
+	      if (rv > 0)
+		{
+		  n_read -= rv;
+		  offset += rv;
+		}
+	    }
+	  while ((rv <= 0 || n_read > 0) && !utm->time_to_stop);
+
+	  /* If event wasn't set, add one */
+	  if (svm_fifo_set_event (tx_fifo))
+	    app_send_io_evt_to_vpp (session->vpp_evt_q, tx_fifo,
+				    et, SVM_Q_WAIT);
 	}
-      while (rv == SVM_FIFO_FULL);
     }
+  while ((n_read < 0 || max_dequeue > 0) && !utm->time_to_stop);
 }
 
-void
+static void
 server_handle_event_queue (udp_echo_main_t * utm)
 {
   session_event_t *e;
   svm_msg_q_msg_t msg;
+  svm_msg_q_t *mq = utm->our_event_queue;
+  int i;
 
   while (utm->state != STATE_READY)
     sleep (5);
 
   while (1)
     {
-      if (svm_msg_q_sub (utm->our_event_queue, &msg, SVM_Q_WAIT, 0))
+      if (svm_msg_q_sub (mq, &msg, SVM_Q_WAIT, 0))
 	{
 	  clib_warning ("svm msg q returned");
 	  continue;
 	}
-      e = svm_msg_q_msg_data (utm->our_event_queue, &msg);
+      e = svm_msg_q_msg_data (mq, &msg);
       switch (e->event_type)
 	{
 	case FIFO_EVENT_APP_RX:
-	  server_handle_fifo_event_rx (utm, e);
+	  server_handle_fifo_event_rx (utm, e->fifo->client_session_index);
+	  break;
+	case SESSION_IO_EVT_CT_TX:
 	  break;
 
 	default:
 	  handle_mq_event (e);
 	  break;
 	}
-      svm_msg_q_free_msg (utm->our_event_queue, &msg);
+      svm_msg_q_free_msg (mq, &msg);
       if (PREDICT_FALSE (utm->time_to_stop == 1))
 	return;
       if (PREDICT_FALSE (utm->time_to_print_stats == 1))
@@ -1214,7 +1225,7 @@ main (int argc, char **argv)
 
   svm_fifo_segment_main_init (0x200000000ULL, 20);
 
-  vec_validate (utm->rx_buf, 8192);
+  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;