hsa: move tcp_echo to vpp_echo

Type: refactor

Change-Id: Ic23859a1686eff2ae4d08a86b69ff4813498459e
Signed-off-by: Nathan Skrzypczak <nathan.skrzypczak@gmail.com>

3 files changed, 144 insertions, 1420 deletions

diff --git a/src/plugins/hs_apps/CMakeLists.txt b/src/plugins/hs_apps/CMakeLists.txt
index 2334cb5b952..ff097339da8 100644
--- a/src/plugins/hs_apps/CMakeLists.txt
+++ b/src/plugins/hs_apps/CMakeLists.txt
@@ -28,18 +28,13 @@ add_vpp_plugin(hs_apps
 ##############################################################################
 option(VPP_BUILD_HS_SAPI_APPS "Build hs apps that use the session api." ON)
 if(VPP_BUILD_HS_SAPI_APPS)
-  add_vpp_executable(tcp_echo
-    SOURCES sapi/tcp_echo.c
-    LINK_LIBRARIES vlibmemoryclient svm vppinfra pthread m rt
-    DEPENDS api_headers
-    NO_INSTALL
-  )
   add_vpp_executable(vpp_echo
     SOURCES
     sapi/vpp_echo.c
     sapi/vpp_echo_common.c
     sapi/vpp_echo_bapi.c
     sapi/vpp_echo_proto_quic.c
+    sapi/vpp_echo_proto_tcp.c
     LINK_LIBRARIES vlibmemoryclient svm vppinfra pthread m rt
     DEPENDS api_headers
     NO_INSTALL
diff --git a/src/plugins/hs_apps/sapi/tcp_echo.c b/src/plugins/hs_apps/sapi/tcp_echo.c
deleted file mode 100644
index 6c3ce928490..00000000000
--- a/src/plugins/hs_apps/sapi/tcp_echo.c
+++ /dev/null
@@ -1,1414 +0,0 @@
-/*
- * Copyright (c) 2016 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 <stdio.h>
-#include <signal.h>
-
-#include <vnet/session/application_interface.h>
-#include <vlibmemory/api.h>
-
-#include <vpp/api/vpe_msg_enum.h>
-#include <svm/fifo_segment.h>
-
-#define vl_typedefs		/* define message structures */
-#include <vpp/api/vpe_all_api_h.h>
-#undef vl_typedefs
-
-/* declare message handlers for each api */
-
-#define vl_endianfun		/* define message structures */
-#include <vpp/api/vpe_all_api_h.h>
-#undef vl_endianfun
-
-/* instantiate all the print functions we know about */
-#define vl_print(handle, ...)
-#define vl_printfun
-#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
-{
-  CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
-#define _(type, name) type name;
-  foreach_app_session_field
-#undef _
-  u64 vpp_session_handle;
-  u64 bytes_sent;
-  u64 bytes_to_send;
-  volatile u64 bytes_received;
-  volatile u64 bytes_to_receive;
-  f64 start;
-} echo_session_t;
-
-typedef enum
-{
-  STATE_START,
-  STATE_ATTACHED,
-  STATE_LISTEN,
-  STATE_READY,
-  STATE_DISCONNECTING,
-  STATE_FAILED,
-  STATE_DETACHED
-} connection_state_t;
-
-typedef struct
-{
-  /* vpe input queue */
-  svm_queue_t *vl_input_queue;
-
-  /* API client handle */
-  u32 my_client_index;
-
-  /* The URI we're playing with */
-  u8 *uri;
-
-  /* Session pool */
-  echo_session_t *sessions;
-
-  /* Hash table for disconnect processing */
-  uword *session_index_by_vpp_handles;
-
-  /* intermediate rx buffer */
-  u8 *rx_buf;
-
-  /* URI for slave's connect */
-  u8 *connect_uri;
-
-  u32 connected_session_index;
-
-  int i_am_master;
-
-  /* drop all packets */
-  int no_return;
-
-  /* Our event queue */
-  svm_msg_q_t *our_event_queue;
-
-  u8 *socket_name;
-
-  pid_t my_pid;
-
-  /* For deadman timers */
-  clib_time_t clib_time;
-
-  /* State of the connection, shared between msg RX thread and main thread */
-  volatile connection_state_t state;
-
-  /* Signal variables */
-  volatile int time_to_stop;
-  volatile int time_to_print_stats;
-
-  u32 configured_segment_size;
-
-  /* VNET_API_ERROR_FOO -> "Foo" hash table */
-  uword *error_string_by_error_number;
-
-  u8 *connect_test_data;
-  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
-   * and all other messages are exchanged using shm IPC. */
-  u8 use_sock_api;
-
-  fifo_segment_main_t segment_main;
-} echo_main_t;
-
-echo_main_t echo_main;
-
-#if CLIB_DEBUG > 0
-#define NITER 10000
-#else
-#define NITER 4000000
-#endif
-
-static u8 *
-format_api_error (u8 * s, va_list * args)
-{
-  echo_main_t *em = &echo_main;
-  i32 error = va_arg (*args, u32);
-  uword *p;
-
-  p = hash_get (em->error_string_by_error_number, -error);
-
-  if (p)
-    s = format (s, "%s", p[0]);
-  else
-    s = format (s, "%d", error);
-  return s;
-}
-
-static void
-init_error_string_table (echo_main_t * em)
-{
-  em->error_string_by_error_number = hash_create (0, sizeof (uword));
-
-#define _(n,v,s) hash_set (em->error_string_by_error_number, -v, s);
-  foreach_vnet_api_error;
-#undef _
-
-  hash_set (em->error_string_by_error_number, 99, "Misc");
-}
-
-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
-
-  timeout = clib_time_now (&em->clib_time) + TIMEOUT;
-
-  while (clib_time_now (&em->clib_time) < timeout)
-    {
-      if (em->state == state)
-	return 0;
-      if (em->state == STATE_FAILED)
-	return -1;
-      if (em->time_to_stop == 1)
-	return 0;
-      if (!em->our_event_queue || em->state < STATE_ATTACHED)
-	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 %d", state);
-  return -1;
-}
-
-void
-application_send_attach (echo_main_t * em)
-{
-  vl_api_application_attach_t *bmp;
-  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));
-  clib_memset (bmp, 0, sizeof (*bmp));
-
-  bmp->_vl_msg_id = ntohs (VL_API_APPLICATION_ATTACH);
-  bmp->client_index = em->my_client_index;
-  bmp->context = ntohl (0xfeedface);
-  bmp->options[APP_OPTIONS_FLAGS] = APP_OPTIONS_FLAGS_ACCEPT_REDIRECT;
-  bmp->options[APP_OPTIONS_FLAGS] |= APP_OPTIONS_FLAGS_ADD_SEGMENT;
-  bmp->options[APP_OPTIONS_PREALLOC_FIFO_PAIRS] = 16;
-  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;
-  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);
-  clib_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_fast (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);
-  clib_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_fast (key_mp->key, test_srv_key_rsa, test_srv_key_rsa_len);
-  vl_msg_api_send_shmem (em->vl_input_queue, (u8 *) & key_mp);
-}
-
-static int
-application_attach (echo_main_t * em)
-{
-  application_send_attach (em);
-  if (wait_for_state_change (em, STATE_ATTACHED))
-    {
-      clib_warning ("timeout waiting for STATE_ATTACHED");
-      return -1;
-    }
-  return 0;
-}
-
-void
-application_detach (echo_main_t * em)
-{
-  vl_api_application_detach_t *bmp;
-  bmp = vl_msg_api_alloc (sizeof (*bmp));
-  clib_memset (bmp, 0, sizeof (*bmp));
-
-  bmp->_vl_msg_id = ntohs (VL_API_APPLICATION_DETACH);
-  bmp->client_index = em->my_client_index;
-  bmp->context = ntohl (0xfeedface);
-  vl_msg_api_send_shmem (em->vl_input_queue, (u8 *) & bmp);
-
-  DBG ("%s", "Sent detach");
-}
-
-static int
-ssvm_segment_attach (char *name, ssvm_segment_type_t type, int fd)
-{
-  fifo_segment_create_args_t _a, *a = &_a;
-  fifo_segment_main_t *sm = &echo_main.segment_main;
-  int rv;
-
-  clib_memset (a, 0, sizeof (*a));
-  a->segment_name = (char *) name;
-  a->segment_type = type;
-
-  if (type == SSVM_SEGMENT_MEMFD)
-    a->memfd_fd = fd;
-
-  if ((rv = fifo_segment_attach (sm, a)))
-    {
-      clib_warning ("svm_fifo_segment_attach ('%s') failed", name);
-      return rv;
-    }
-
-  vec_reset_length (a->new_segment_indices);
-  return 0;
-}
-
-static void
-vl_api_application_attach_reply_t_handler (vl_api_application_attach_reply_t *
-					   mp)
-{
-  echo_main_t *em = &echo_main;
-  int *fds = 0;
-  u32 n_fds = 0;
-
-  if (mp->retval)
-    {
-      clib_warning ("attach failed: %U", format_api_error,
-		    clib_net_to_host_u32 (mp->retval));
-      goto failed;
-    }
-
-  if (mp->segment_name_length == 0)
-    {
-      clib_warning ("segment_name_length zero");
-      goto failed;
-    }
-
-  ASSERT (mp->app_event_queue_address);
-  em->our_event_queue = uword_to_pointer (mp->app_event_queue_address,
-					  svm_msg_q_t *);
-
-  if (mp->n_fds)
-    {
-      vec_validate (fds, mp->n_fds);
-      vl_socket_client_recv_fd_msg (fds, mp->n_fds, 5);
-
-      if (mp->fd_flags & SESSION_FD_F_VPP_MQ_SEGMENT)
-	if (ssvm_segment_attach (0, SSVM_SEGMENT_MEMFD, fds[n_fds++]))
-	  goto failed;
-
-      if (mp->fd_flags & SESSION_FD_F_MEMFD_SEGMENT)
-	if (ssvm_segment_attach ((char *) mp->segment_name,
-				 SSVM_SEGMENT_MEMFD, fds[n_fds++]))
-	  goto failed;
-
-      if (mp->fd_flags & SESSION_FD_F_MQ_EVENTFD)
-	svm_msg_q_set_consumer_eventfd (em->our_event_queue, fds[n_fds++]);
-
-      vec_free (fds);
-    }
-  else
-    {
-      if (ssvm_segment_attach ((char *) mp->segment_name, SSVM_SEGMENT_SHM,
-			       -1))
-	goto failed;
-    }
-
-  em->state = STATE_ATTACHED;
-  return;
-failed:
-  em->state = STATE_FAILED;
-  return;
-}
-
-static void
-vl_api_application_detach_reply_t_handler (vl_api_application_detach_reply_t *
-					   mp)
-{
-  if (mp->retval)
-    clib_warning ("detach returned with err: %d", mp->retval);
-  echo_main.state = STATE_DETACHED;
-}
-
-static void
-stop_signal (int signum)
-{
-  echo_main_t *um = &echo_main;
-
-  um->time_to_stop = 1;
-}
-
-static void
-stats_signal (int signum)
-{
-  echo_main_t *um = &echo_main;
-
-  um->time_to_print_stats = 1;
-}
-
-static clib_error_t *
-setup_signal_handlers (void)
-{
-  signal (SIGINT, stats_signal);
-  signal (SIGQUIT, stop_signal);
-  signal (SIGTERM, stop_signal);
-
-  return 0;
-}
-
-void
-vlib_cli_output (struct vlib_main_t *vm, char *fmt, ...)
-{
-  clib_warning ("BUG");
-}
-
-int
-connect_to_vpp (char *name)
-{
-  echo_main_t *em = &echo_main;
-  api_main_t *am = &api_main;
-
-  if (em->use_sock_api)
-    {
-      if (vl_socket_client_connect ((char *) em->socket_name, name,
-				    0 /* default rx, tx buffer */ ))
-	{
-	  clib_warning ("socket connect failed");
-	  return -1;
-	}
-
-      if (vl_socket_client_init_shm (0, 1 /* want_pthread */ ))
-	{
-	  clib_warning ("init shm api failed");
-	  return -1;
-	}
-    }
-  else
-    {
-      if (vl_client_connect_to_vlib ("/vpe-api", name, 32) < 0)
-	{
-	  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 (echo_main_t * em)
-{
-  if (em->use_sock_api)
-    vl_socket_client_disconnect ();
-  else
-    vl_client_disconnect_from_vlib ();
-}
-
-static void
-vl_api_map_another_segment_t_handler (vl_api_map_another_segment_t * mp)
-{
-  fifo_segment_main_t *sm = &echo_main.segment_main;
-  fifo_segment_create_args_t _a, *a = &_a;
-  int rv;
-
-  clib_memset (a, 0, sizeof (*a));
-  a->segment_name = (char *) mp->segment_name;
-  a->segment_size = mp->segment_size;
-  /* Attach to the segment vpp created */
-  rv = fifo_segment_attach (sm, a);
-  if (rv)
-    {
-      clib_warning ("svm_fifo_segment_attach ('%s') failed",
-		    mp->segment_name);
-      return;
-    }
-  clib_warning ("Mapped new segment '%s' size %d", mp->segment_name,
-		mp->segment_size);
-}
-
-static void
-session_print_stats (echo_main_t * em, echo_session_t * session)
-{
-  f64 deltat;
-  u64 bytes;
-
-  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
-test_recv_bytes (echo_session_t * s, u8 * rx_buf, u32 n_read)
-{
-  int i;
-  for (i = 0; i < n_read; i++)
-    {
-      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));
-	}
-    }
-}
-
-static void
-recv_data_chunk (echo_main_t * em, echo_session_t * s, u8 * rx_buf)
-{
-  int n_to_read, n_read;
-
-  n_to_read = svm_fifo_max_dequeue_cons (s->rx_fifo);
-  if (!n_to_read)
-    return;
-
-  do
-    {
-      n_read = app_recv_stream ((app_session_t *) s, rx_buf,
-				vec_len (rx_buf));
-
-      if (n_read > 0)
-	{
-	  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;
-	}
-      else
-	break;
-    }
-  while (n_to_read > 0);
-}
-
-static void
-send_data_chunk (echo_main_t * em, echo_session_t * s)
-{
-  u64 test_buf_len, bytes_this_chunk, test_buf_offset;
-  u8 *test_data = em->connect_test_data;
-  int n_sent;
-
-  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);
-
-  n_sent = app_send_stream ((app_session_t *) s, test_data + test_buf_offset,
-			    bytes_this_chunk, 0);
-
-  if (n_sent > 0)
-    {
-      s->bytes_to_send -= n_sent;
-      s->bytes_sent += n_sent;
-    }
-}
-
-/*
- * Rx/Tx polling thread per connection
- */
-static void *
-client_thread_fn (void *arg)
-{
-  echo_main_t *em = &echo_main;
-  static u8 *rx_buf = 0;
-  u32 session_index = *(u32 *) arg;
-  echo_session_t *s;
-
-  vec_validate (rx_buf, 1 << 20);
-
-  while (!em->time_to_stop && em->state != STATE_READY)
-    ;
-
-  s = pool_elt_at_index (em->sessions, session_index);
-  while (!em->time_to_stop)
-    {
-      send_data_chunk (em, s);
-      recv_data_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);
-}
-
-void
-client_send_connect (echo_main_t * em)
-{
-  vl_api_connect_uri_t *cmp;
-  cmp = vl_msg_api_alloc (sizeof (*cmp));
-  clib_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, echo_session_t * s)
-{
-  vl_api_disconnect_session_t *dmp;
-  dmp = vl_msg_api_alloc (sizeof (*dmp));
-  clib_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, echo_session_t * s)
-{
-  client_send_disconnect (em, s);
-  pool_put (em->sessions, s);
-  clib_memset (s, 0xfe, sizeof (*s));
-  return 0;
-}
-
-static void
-session_bound_handler (session_bound_msg_t * mp)
-{
-  echo_main_t *em = &echo_main;
-
-  if (mp->retval)
-    {
-      clib_warning ("bind failed: %U", format_api_error,
-		    clib_net_to_host_u32 (mp->retval));
-      em->state = STATE_FAILED;
-      return;
-    }
-
-  clib_warning ("listening on %U:%u", format_ip46_address, mp->lcl_ip,
-		mp->lcl_is_ip4 ? IP46_TYPE_IP4 : IP46_TYPE_IP6, mp->lcl_port);
-  em->state = STATE_READY;
-}
-
-static void
-session_accepted_handler (session_accepted_msg_t * mp)
-{
-  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;
-  echo_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->rmt.ip, mp->rmt.is_ip4);
-  clib_warning ("Accepted session from: %s:%d", ip_str,
-		clib_net_to_host_u16 (mp->rmt.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->rx_fifo = rx_fifo;
-  session->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;
-  echo_session_t *session;
-  u32 session_index;
-  svm_fifo_t *rx_fifo, *tx_fifo;
-  int rv;
-
-  if (mp->retval)
-    {
-      clib_warning ("connection failed with code: %U", format_api_error,
-		    clib_net_to_host_u32 (mp->retval));
-      em->state = STATE_FAILED;
-      return;
-    }
-
-  /*
-   * Setup session
-   */
-
-  pool_get (em->sessions, session);
-  clib_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;
-  tx_fifo = uword_to_pointer (mp->server_tx_fifo, svm_fifo_t *);
-  tx_fifo->client_session_index = session_index;
-
-  session->rx_fifo = rx_fifo;
-  session->tx_fifo = tx_fifo;
-  session->vpp_session_handle = mp->handle;
-  session->start = clib_time_now (&em->clib_time);
-  session->vpp_evt_q = uword_to_pointer (mp->vpp_event_queue_address,
-					 svm_msg_q_t *);
-
-  hash_set (em->session_index_by_vpp_handles, mp->handle, session_index);
-
-  /*
-   * 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);
-      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->lcl.is_ip4, clib_net_to_host_u16 (mp->lcl.port));
-}
-
-static void
-session_disconnected_handler (session_disconnected_msg_t * mp)
-{
-  app_session_evt_t _app_evt, *app_evt = &_app_evt;
-  session_disconnected_reply_msg_t *rmp;
-  echo_main_t *em = &echo_main;
-  echo_session_t *session = 0;
-  uword *p;
-  int rv = 0;
-
-  p = hash_get (em->session_index_by_vpp_handles, mp->handle);
-  if (!p)
-    {
-      clib_warning ("couldn't find session key %llx", mp->handle);
-      return;
-    }
-
-  session = pool_elt_at_index (em->sessions, p[0]);
-  hash_unset (em->session_index_by_vpp_handles, mp->handle);
-  pool_put (em->sessions, session);
-
-  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);
-
-  session_print_stats (em, session);
-}
-
-static void
-session_reset_handler (session_reset_msg_t * mp)
-{
-  app_session_evt_t _app_evt, *app_evt = &_app_evt;
-  echo_main_t *em = &echo_main;
-  session_reset_reply_msg_t *rmp;
-  echo_session_t *session = 0;
-  uword *p;
-  int rv = 0;
-
-  p = hash_get (em->session_index_by_vpp_handles, mp->handle);
-
-  if (p)
-    {
-      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;
-    }
-
-  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);
-}
-
-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;
-    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);
-    }
-}
-
-static void
-clients_run (echo_main_t * em)
-{
-  f64 start_time, deltat, timeout = 100.0;
-  svm_msg_q_msg_t msg;
-  session_event_t *e;
-  echo_session_t *s;
-  int i;
-
-  /* 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;
-
-  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)
-
-    {
-      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;
-    }
-
-  /*
-   * 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;
-
-  /*
-   * 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 != SESSION_IO_EVT_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);
-    }
-
-  /*
-   * 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 (em);
-}
-
-static void
-vl_api_bind_uri_reply_t_handler (vl_api_bind_uri_reply_t * mp)
-{
-  echo_main_t *em = &echo_main;
-
-  if (mp->retval)
-    {
-      clib_warning ("bind failed: %U", format_api_error,
-		    clib_net_to_host_u32 (mp->retval));
-      em->state = STATE_FAILED;
-      return;
-    }
-
-  em->state = STATE_READY;
-}
-
-static void
-vl_api_unbind_uri_reply_t_handler (vl_api_unbind_uri_reply_t * mp)
-{
-  echo_main_t *em = &echo_main;
-
-  if (mp->retval != 0)
-    clib_warning ("returned %d", ntohl (mp->retval));
-
-  em->state = STATE_START;
-}
-
-u8 *
-format_ip4_address (u8 * s, va_list * args)
-{
-  u8 *a = va_arg (*args, u8 *);
-  return format (s, "%d.%d.%d.%d", a[0], a[1], a[2], a[3]);
-}
-
-u8 *
-format_ip6_address (u8 * s, va_list * args)
-{
-  ip6_address_t *a = va_arg (*args, ip6_address_t *);
-  u32 i, i_max_n_zero, max_n_zeros, i_first_zero, n_zeros, last_double_colon;
-
-  i_max_n_zero = ARRAY_LEN (a->as_u16);
-  max_n_zeros = 0;
-  i_first_zero = i_max_n_zero;
-  n_zeros = 0;
-  for (i = 0; i < ARRAY_LEN (a->as_u16); i++)
-    {
-      u32 is_zero = a->as_u16[i] == 0;
-      if (is_zero && i_first_zero >= ARRAY_LEN (a->as_u16))
-	{
-	  i_first_zero = i;
-	  n_zeros = 0;
-	}
-      n_zeros += is_zero;
-      if ((!is_zero && n_zeros > max_n_zeros)
-	  || (i + 1 >= ARRAY_LEN (a->as_u16) && n_zeros > max_n_zeros))
-	{
-	  i_max_n_zero = i_first_zero;
-	  max_n_zeros = n_zeros;
-	  i_first_zero = ARRAY_LEN (a->as_u16);
-	  n_zeros = 0;
-	}
-    }
-
-  last_double_colon = 0;
-  for (i = 0; i < ARRAY_LEN (a->as_u16); i++)
-    {
-      if (i == i_max_n_zero && max_n_zeros > 1)
-	{
-	  s = format (s, "::");
-	  i += max_n_zeros - 1;
-	  last_double_colon = 1;
-	}
-      else
-	{
-	  s = format (s, "%s%x",
-		      (last_double_colon || i == 0) ? "" : ":",
-		      clib_net_to_host_u16 (a->as_u16[i]));
-	  last_double_colon = 0;
-	}
-    }
-
-  return s;
-}
-
-/* Format an IP46 address. */
-u8 *
-format_ip46_address (u8 * s, va_list * args)
-{
-  ip46_address_t *ip46 = va_arg (*args, ip46_address_t *);
-  ip46_type_t type = va_arg (*args, ip46_type_t);
-  int is_ip4 = 1;
-
-  switch (type)
-    {
-    case IP46_TYPE_ANY:
-      is_ip4 = ip46_address_is_ip4 (ip46);
-      break;
-    case IP46_TYPE_IP4:
-      is_ip4 = 1;
-      break;
-    case IP46_TYPE_IP6:
-      is_ip4 = 0;
-      break;
-    }
-
-  return is_ip4 ?
-    format (s, "%U", format_ip4_address, &ip46->ip4) :
-    format (s, "%U", format_ip6_address, &ip46->ip6);
-}
-
-static void
-server_handle_rx (echo_main_t * em, session_event_t * e)
-{
-  int n_read, max_dequeue, n_sent;
-  u32 offset, to_dequeue;
-  echo_session_t *s;
-
-  s = pool_elt_at_index (em->sessions, e->session_index);
-
-  /* Clear event only once. Otherwise, if we do it in the loop by calling
-   * app_recv_stream, we may end up with a lot of unhandled rx events on the
-   * message queue */
-  svm_fifo_unset_event (s->rx_fifo);
-
-  max_dequeue = svm_fifo_max_dequeue_cons (s->rx_fifo);
-  if (PREDICT_FALSE (!max_dequeue))
-    return;
-
-  do
-    {
-      /* The options here are to limit ourselves to max_dequeue or read
-       * even the data that was enqueued while we were dequeueing and which
-       * now has an rx event in the mq. Either of the two work. */
-      to_dequeue = clib_min (max_dequeue, vec_len (em->rx_buf));
-      n_read = app_recv_stream_raw (s->rx_fifo, em->rx_buf, to_dequeue,
-				    0 /* clear evt */ , 0 /* peek */ );
-      if (n_read > 0)
-	{
-	  max_dequeue -= n_read;
-	  s->bytes_received += n_read;
-	}
-      else
-	break;
-
-      /* Reflect if a non-drop session */
-      if (!em->no_return && n_read > 0)
-	{
-	  offset = 0;
-	  do
-	    {
-	      n_sent = app_send_stream ((app_session_t *) s,
-					&em->rx_buf[offset],
-					n_read, SVM_Q_WAIT);
-	      if (n_sent > 0)
-		{
-		  n_read -= n_sent;
-		  offset += n_sent;
-		}
-	    }
-	  while ((n_sent <= 0 || n_read > 0) && !em->time_to_stop);
-	}
-    }
-  while (max_dequeue > 0 && !em->time_to_stop);
-}
-
-static void
-server_handle_mq (echo_main_t * em)
-{
-  svm_msg_q_msg_t msg;
-  session_event_t *e;
-
-  while (1)
-    {
-      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 SESSION_IO_EVT_RX:
-	  server_handle_rx (em, e);
-	  break;
-	default:
-	  handle_mq_event (e);
-	  break;
-	}
-      if (PREDICT_FALSE (em->time_to_stop == 1))
-	break;
-      if (PREDICT_FALSE (em->time_to_print_stats == 1))
-	{
-	  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 (echo_main_t * em)
-{
-  vl_api_bind_uri_t *bmp;
-  bmp = vl_msg_api_alloc (sizeof (*bmp));
-  clib_memset (bmp, 0, sizeof (*bmp));
-
-  bmp->_vl_msg_id = ntohs (VL_API_BIND_URI);
-  bmp->client_index = em->my_client_index;
-  bmp->context = ntohl (0xfeedface);
-  memcpy (bmp->uri, em->uri, vec_len (em->uri));
-  vl_msg_api_send_shmem (em->vl_input_queue, (u8 *) & bmp);
-}
-
-int
-server_listen (echo_main_t * em)
-{
-  server_send_listen (em);
-  if (wait_for_state_change (em, STATE_READY))
-    {
-      clib_warning ("timeout waiting for STATE_READY");
-      return -1;
-    }
-  return 0;
-}
-
-void
-server_send_unbind (echo_main_t * em)
-{
-  vl_api_unbind_uri_t *ump;
-
-  ump = vl_msg_api_alloc (sizeof (*ump));
-  clib_memset (ump, 0, sizeof (*ump));
-
-  ump->_vl_msg_id = ntohs (VL_API_UNBIND_URI);
-  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 (echo_main_t * em)
-{
-  server_send_unbind (em);
-  if (wait_for_state_change (em, STATE_START))
-    {
-      clib_warning ("timeout waiting for STATE_START");
-      return -1;
-    }
-  return 0;
-}
-
-void
-server_run (echo_main_t * em)
-{
-  echo_session_t *session;
-  int i;
-
-  /* $$$$ hack preallocation */
-  for (i = 0; i < 200000; i++)
-    {
-      pool_get (em->sessions, session);
-      clib_memset (session, 0, sizeof (*session));
-    }
-  for (i = 0; i < 200000; i++)
-    pool_put_index (em->sessions, i);
-
-  if (application_attach (em))
-    return;
-
-  /* Bind to uri */
-  if (server_listen (em))
-    return;
-
-  /* Enter handle event loop */
-  server_handle_mq (em);
-
-  /* Cleanup */
-  server_send_unbind (em);
-
-  application_detach (em);
-
-  fformat (stdout, "Test complete...\n");
-}
-
-static void
-vl_api_disconnect_session_reply_t_handler (vl_api_disconnect_session_reply_t *
-					   mp)
-{
-  echo_main_t *em = &echo_main;
-  uword *p;
-
-  if (mp->retval)
-    {
-      clib_warning ("vpp complained about disconnect: %d",
-		    ntohl (mp->retval));
-      return;
-    }
-
-  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);
-    }
-}
-
-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
-tcp_echo_api_hookup (echo_main_t * em)
-{
-#define _(N,n)                                                  \
-    vl_msg_api_set_handlers(VL_API_##N, #n,                     \
-                           vl_api_##n##_t_handler,              \
-                           vl_noop_handler,                     \
-                           vl_api_##n##_t_endian,               \
-                           vl_api_##n##_t_print,                \
-                           sizeof(vl_api_##n##_t), 1);
-  foreach_tcp_echo_msg;
-#undef _
-}
-
-int
-main (int argc, char **argv)
-{
-  int i_am_server = 1, test_return_packets = 0;
-  echo_main_t *em = &echo_main;
-  fifo_segment_main_t *sm = &em->segment_main;
-  unformat_input_t _argv, *a = &_argv;
-  u8 *chroot_prefix;
-  u8 *uri = 0;
-  u8 *bind_uri = (u8 *) "tcp://0.0.0.0/1234";
-  u8 *connect_uri = (u8 *) "tcp://6.0.1.1/1234";
-  u64 bytes_to_send = 64 << 10, mbytes;
-  char *app_name;
-  u32 tmp;
-
-  clib_mem_init_thread_safe (0, 256 << 20);
-
-  clib_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;
-
-  clib_time_init (&em->clib_time);
-  init_error_string_table (em);
-  fifo_segment_main_init (sm, HIGH_SEGMENT_BASEVA, 20);
-  unformat_init_command_line (a, argv);
-
-  while (unformat_check_input (a) != UNFORMAT_END_OF_INPUT)
-    {
-      if (unformat (a, "chroot prefix %s", &chroot_prefix))
-	{
-	  vl_set_memory_root_path ((char *) chroot_prefix);
-	}
-      else if (unformat (a, "uri %s", &uri))
-	;
-      else if (unformat (a, "segment-size %dM", &tmp))
-	em->configured_segment_size = tmp << 20;
-      else if (unformat (a, "segment-size %dG", &tmp))
-	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))
-	{
-	  bytes_to_send = mbytes << 20;
-	}
-      else if (unformat (a, "gbytes %lld", &mbytes))
-	{
-	  bytes_to_send = mbytes << 30;
-	}
-      else if (unformat (a, "socket-name %s", &em->socket_name))
-	;
-      else if (unformat (a, "use-svm-api"))
-	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", argv[0]);
-	  exit (1);
-	}
-    }
-
-  if (!em->socket_name)
-    em->socket_name = format (0, "%s%c", API_SOCKET_FILE, 0);
-
-  if (uri)
-    {
-      em->uri = format (0, "%s%c", uri, 0);
-      em->connect_uri = format (0, "%s%c", uri, 0);
-    }
-  else
-    {
-      em->uri = format (0, "%s%c", bind_uri, 0);
-      em->connect_uri = format (0, "%s%c", connect_uri, 0);
-    }
-
-  em->i_am_master = i_am_server;
-  em->test_return_packets = test_return_packets;
-  em->bytes_to_send = bytes_to_send;
-  em->time_to_stop = 0;
-  vec_validate (em->rx_buf, 4 << 20);
-  vec_validate (em->client_thread_handles, em->n_clients - 1);
-  vec_validate (em->thread_args, em->n_clients - 1);
-
-  setup_signal_handlers ();
-  tcp_echo_api_hookup (em);
-
-  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_server == 0)
-    clients_run (em);
-  else
-    server_run (em);
-
-  /* Make sure detach finishes */
-  wait_for_state_change (em, STATE_DETACHED);
-
-  disconnect_from_vpp (em);
-  exit (0);
-}
-
-/*
- * fd.io coding-style-patch-verification: ON
- *
- * Local Variables:
- * eval: (c-set-style "gnu")
- * End:
- */
diff --git a/src/plugins/hs_apps/sapi/vpp_echo_proto_tcp.c b/src/plugins/hs_apps/sapi/vpp_echo_proto_tcp.c
new file mode 100644
index 00000000000..51144d34889
--- /dev/null
+++ b/src/plugins/hs_apps/sapi/vpp_echo_proto_tcp.c
@@ -0,0 +1,143 @@
+/*
+ * Copyright (c) 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 <stdio.h>
+#include <signal.h>
+
+#include <hs_apps/sapi/vpp_echo_common.h>
+
+static void
+tcp_echo_cleanup_cb (echo_session_t * s, u8 parent_died)
+{
+  echo_main_t *em = &echo_main;
+  echo_session_t *ls;
+  ASSERT (s->session_state < ECHO_SESSION_STATE_CLOSED);
+  if (parent_died)
+    clib_atomic_fetch_add (&em->stats.clean_count.s, 1);
+  else if (s->listener_index != SESSION_INVALID_INDEX)
+    {
+      ls = pool_elt_at_index (em->sessions, s->listener_index);
+      clib_atomic_sub_fetch (&ls->accepted_session_count, 1);
+    }
+
+
+  clib_atomic_sub_fetch (&em->n_clients_connected, 1);
+  s->session_state = ECHO_SESSION_STATE_CLOSED;
+  if (!em->n_clients_connected)
+    em->state = STATE_DATA_DONE;
+}
+
+static void
+tcp_echo_connected_cb (session_connected_bundled_msg_t * mp,
+		       u32 session_index, u8 is_failed)
+{
+  static u32 client_index = 0;
+  echo_main_t *em = &echo_main;
+  echo_session_t *session = pool_elt_at_index (em->sessions, session_index);
+  if (is_failed)
+    {
+      ECHO_FAIL ("Bapi connect errored");
+      return;			/* Dont handle bapi connect errors for now */
+    }
+
+  ECHO_LOG (1, "Connected session 0x%lx -> URI",
+	    ((session_connected_msg_t *) mp)->handle);
+  session->session_type = ECHO_SESSION_TYPE_STREAM;
+  session->accepted_session_count = 0;
+  clib_atomic_fetch_add (&em->n_clients_connected, 1);
+  session->bytes_to_send = em->bytes_to_send;
+  session->bytes_to_receive = em->bytes_to_receive;
+  session->session_state = ECHO_SESSION_STATE_READY;
+  em->data_thread_args[client_index++] = session->session_index;
+
+  if (em->n_clients_connected == em->n_clients && em->state < STATE_READY)
+    {
+      echo_notify_event (em, ECHO_EVT_LAST_SCONNECTED);
+      em->state = STATE_READY;
+    }
+}
+
+static void
+tcp_echo_accepted_cb (session_accepted_msg_t * mp, echo_session_t * session)
+{
+  static u32 client_index = 0;
+  echo_main_t *em = &echo_main;
+  echo_session_t *ls;
+
+  echo_notify_event (em, ECHO_EVT_FIRST_QCONNECT);
+  ls = pool_elt_at_index (em->sessions, session->listener_index);
+  session->session_type = ECHO_SESSION_TYPE_STREAM;
+  echo_notify_event (em, ECHO_EVT_FIRST_SCONNECT);
+  clib_atomic_fetch_add (&ls->accepted_session_count, 1);
+  clib_atomic_fetch_add (&em->n_clients_connected, 1);
+
+  session->bytes_to_send = em->bytes_to_send;
+  session->bytes_to_receive = em->bytes_to_receive;
+  em->data_thread_args[client_index++] = session->session_index;
+  session->session_state = ECHO_SESSION_STATE_READY;
+
+  if (em->n_clients_connected == em->n_clients && em->state < STATE_READY)
+    {
+      echo_notify_event (em, ECHO_EVT_LAST_SCONNECTED);
+      em->state = STATE_READY;
+    }
+}
+
+static void
+tcp_echo_disconnected_reply_cb (echo_session_t * s)
+{
+  s->session_state = ECHO_SESSION_STATE_CLOSING;
+}
+
+static void
+tcp_echo_disconnected_cb (session_disconnected_msg_t * mp, echo_session_t * s)
+{
+  echo_main_t *em = &echo_main;
+  echo_session_print_stats (em, s);
+  if (s->bytes_to_receive || s->bytes_to_send)
+    s->session_state = ECHO_SESSION_STATE_AWAIT_DATA;
+  else
+    s->session_state = ECHO_SESSION_STATE_CLOSING;
+  clib_atomic_fetch_add (&em->stats.close_count.s, 1);
+}
+
+static void
+tcp_echo_reset_cb (session_reset_msg_t * mp, echo_session_t * s)
+{
+  echo_main_t *em = &echo_main;
+  clib_atomic_fetch_add (&em->stats.reset_count.s, 1);
+  s->session_state = ECHO_SESSION_STATE_CLOSING;
+}
+
+echo_proto_cb_vft_t echo_tcp_proto_cb_vft = {
+  .disconnected_cb = tcp_echo_disconnected_cb,
+  .connected_cb = tcp_echo_connected_cb,
+  .accepted_cb = tcp_echo_accepted_cb,
+  .reset_cb = tcp_echo_reset_cb,
+  .disconnected_reply_cb = tcp_echo_disconnected_reply_cb,
+  .cleanup_cb = tcp_echo_cleanup_cb,
+};
+
+ECHO_REGISTER_PROTO (TRANSPORT_PROTO_TCP, echo_tcp_proto_cb_vft);
+ECHO_REGISTER_PROTO (TRANSPORT_PROTO_TLS, echo_tcp_proto_cb_vft);
+ECHO_REGISTER_PROTO (TRANSPORT_PROTO_SCTP, echo_tcp_proto_cb_vft);
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */