vcl: wait for segments with segment handle
[vpp.git] / src / vnet / session / application.c
index bc837bb..f362896 100644 (file)
 
 #include <vnet/session/application.h>
 #include <vnet/session/application_interface.h>
+#include <vnet/session/application_namespace.h>
 #include <vnet/session/session.h>
 
-/**
- * Pool from which we allocate all applications
- */
-static application_t *app_pool;
+static app_main_t app_main;
 
-/**
- * Hash table of apps by api client index
- */
-static uword *app_by_api_client_index;
+static app_listener_t *
+app_listener_alloc (application_t * app)
+{
+  app_listener_t *app_listener;
+  pool_get (app->listeners, app_listener);
+  clib_memset (app_listener, 0, sizeof (*app_listener));
+  app_listener->al_index = app_listener - app->listeners;
+  return app_listener;
+}
 
-/**
- * Default application event queue size
- */
-static u32 default_app_evt_queue_size = 128;
+static app_listener_t *
+app_listener_get (application_t * app, u32 app_listener_index)
+{
+  return pool_elt_at_index (app->listeners, app_listener_index);
+}
 
-int
-application_api_queue_is_full (application_t * app)
+static void
+app_listener_free (application_t * app, app_listener_t * app_listener)
+{
+  clib_bitmap_free (app_listener->workers);
+  pool_put (app->listeners, app_listener);
+  if (CLIB_DEBUG)
+    clib_memset (app_listener, 0xfa, sizeof (*app_listener));
+}
+
+static app_listener_t *
+app_local_listener_alloc (application_t * app)
+{
+  app_listener_t *app_listener;
+  pool_get (app->local_listeners, app_listener);
+  clib_memset (app_listener, 0, sizeof (*app_listener));
+  app_listener->al_index = app_listener - app->local_listeners;
+  return app_listener;
+}
+
+static app_listener_t *
+app_local_listener_get (application_t * app, u32 app_listener_index)
+{
+  return pool_elt_at_index (app->local_listeners, app_listener_index);
+}
+
+static void
+app_local_listener_free (application_t * app, app_listener_t * app_listener)
+{
+  clib_bitmap_free (app_listener->workers);
+  pool_put (app->local_listeners, app_listener);
+  if (CLIB_DEBUG)
+    clib_memset (app_listener, 0xfa, sizeof (*app_listener));
+}
+
+static app_worker_map_t *
+app_worker_map_alloc (application_t * app)
+{
+  app_worker_map_t *map;
+  pool_get (app->worker_maps, map);
+  clib_memset (map, 0, sizeof (*map));
+  return map;
+}
+
+static u32
+app_worker_map_index (application_t * app, app_worker_map_t * map)
+{
+  return (map - app->worker_maps);
+}
+
+static void
+app_worker_map_free (application_t * app, app_worker_map_t * map)
 {
-  unix_shared_memory_queue_t *q;
+  pool_put (app->worker_maps, map);
+}
+
+static app_worker_map_t *
+app_worker_map_get (application_t * app, u32 map_index)
+{
+  return pool_elt_at_index (app->worker_maps, map_index);
+}
+
+static const u8 *
+app_get_name (application_t * app)
+{
+  return app->name;
+}
+
+u32
+application_session_table (application_t * app, u8 fib_proto)
+{
+  app_namespace_t *app_ns;
+  app_ns = app_namespace_get (app->ns_index);
+  if (!application_has_global_scope (app))
+    return APP_INVALID_INDEX;
+  if (fib_proto == FIB_PROTOCOL_IP4)
+    return session_lookup_get_index_for_fib (fib_proto,
+                                            app_ns->ip4_fib_index);
+  else
+    return session_lookup_get_index_for_fib (fib_proto,
+                                            app_ns->ip6_fib_index);
+}
+
+u32
+application_local_session_table (application_t * app)
+{
+  app_namespace_t *app_ns;
+  if (!application_has_local_scope (app))
+    return APP_INVALID_INDEX;
+  app_ns = app_namespace_get (app->ns_index);
+  return app_ns->local_table_index;
+}
 
-  /* builtin servers are always OK */
-  if (app->api_client_index == ~0)
+static void
+application_local_listener_session_endpoint (local_session_t * ll,
+                                            session_endpoint_t * sep)
+{
+  sep->transport_proto =
+    session_type_transport_proto (ll->listener_session_type);
+  sep->port = ll->port;
+  sep->is_ip4 = ll->listener_session_type & 1;
+}
+
+/**
+ * Returns app name for app-index
+ */
+const u8 *
+application_name_from_index (u32 app_index)
+{
+  application_t *app = application_get (app_index);
+  if (!app)
     return 0;
+  return app_get_name (app);
+}
 
-  q = vl_api_client_index_to_input_queue (app->api_client_index);
-  if (!q)
-    return 1;
+static void
+application_api_table_add (u32 app_index, u32 api_client_index)
+{
+  if (api_client_index != APP_INVALID_INDEX)
+    hash_set (app_main.app_by_api_client_index, api_client_index, app_index);
+}
 
-  if (q->cursize == q->maxsize)
-    return 1;
-  return 0;
+static void
+application_api_table_del (u32 api_client_index)
+{
+  hash_unset (app_main.app_by_api_client_index, api_client_index);
 }
 
 static void
-application_table_add (application_t * app)
+application_name_table_add (application_t * app)
 {
-  hash_set (app_by_api_client_index, app->api_client_index, app->index);
+  hash_set_mem (app_main.app_by_name, app->name, app->app_index);
 }
 
 static void
-application_table_del (application_t * app)
+application_name_table_del (application_t * app)
 {
-  hash_unset (app_by_api_client_index, app->api_client_index);
+  hash_unset_mem (app_main.app_by_name, app->name);
 }
 
 application_t *
 application_lookup (u32 api_client_index)
 {
   uword *p;
-  p = hash_get (app_by_api_client_index, api_client_index);
+  p = hash_get (app_main.app_by_api_client_index, api_client_index);
+  if (p)
+    return application_get_if_valid (p[0]);
+
+  return 0;
+}
+
+application_t *
+application_lookup_name (const u8 * name)
+{
+  uword *p;
+  p = hash_get_mem (app_main.app_by_name, name);
   if (p)
     return application_get (p[0]);
 
@@ -74,169 +198,530 @@ application_lookup (u32 api_client_index)
 }
 
 application_t *
-application_new ()
+application_alloc (void)
 {
   application_t *app;
-  pool_get (app_pool, app);
-  memset (app, 0, sizeof (*app));
-  app->index = application_get_index (app);
-  app->connects_seg_manager = ~0;
-  app->first_segment_manager = ~0;
-  if (CLIB_DEBUG > 1)
-    clib_warning ("[%d] New app (%d)", getpid (), app->index);
+  pool_get (app_main.app_pool, app);
+  clib_memset (app, 0, sizeof (*app));
+  app->app_index = app - app_main.app_pool;
   return app;
 }
 
+application_t *
+application_get (u32 app_index)
+{
+  if (app_index == APP_INVALID_INDEX)
+    return 0;
+  return pool_elt_at_index (app_main.app_pool, app_index);
+}
+
+application_t *
+application_get_if_valid (u32 app_index)
+{
+  if (pool_is_free_index (app_main.app_pool, app_index))
+    return 0;
+
+  return pool_elt_at_index (app_main.app_pool, app_index);
+}
+
+static void
+application_verify_cb_fns (session_cb_vft_t * cb_fns)
+{
+  if (cb_fns->session_accept_callback == 0)
+    clib_warning ("No accept callback function provided");
+  if (cb_fns->session_connected_callback == 0)
+    clib_warning ("No session connected callback function provided");
+  if (cb_fns->session_disconnect_callback == 0)
+    clib_warning ("No session disconnect callback function provided");
+  if (cb_fns->session_reset_callback == 0)
+    clib_warning ("No session reset callback function provided");
+}
+
+/**
+ * Check app config for given segment type
+ *
+ * Returns 1 on success and 0 otherwise
+ */
+static u8
+application_verify_cfg (ssvm_segment_type_t st)
+{
+  u8 is_valid;
+  if (st == SSVM_SEGMENT_MEMFD)
+    {
+      is_valid = (session_manager_get_evt_q_segment () != 0);
+      if (!is_valid)
+       clib_warning ("memfd seg: vpp's event qs IN binary api svm region");
+      return is_valid;
+    }
+  else if (st == SSVM_SEGMENT_SHM)
+    {
+      is_valid = (session_manager_get_evt_q_segment () == 0);
+      if (!is_valid)
+       clib_warning ("shm seg: vpp's event qs NOT IN binary api svm region");
+      return is_valid;
+    }
+  else
+    return 1;
+}
+
+int
+application_alloc_and_init (app_init_args_t * a)
+{
+  ssvm_segment_type_t seg_type = SSVM_SEGMENT_MEMFD;
+  segment_manager_properties_t *props;
+  vl_api_registration_t *reg;
+  application_t *app;
+  u64 *options;
+
+  app = application_alloc ();
+  options = a->options;
+  /*
+   * Make sure we support the requested configuration
+   */
+  if (!(options[APP_OPTIONS_FLAGS] & APP_OPTIONS_FLAGS_IS_BUILTIN))
+    {
+      reg = vl_api_client_index_to_registration (a->api_client_index);
+      if (!reg)
+       return VNET_API_ERROR_APP_UNSUPPORTED_CFG;
+      if (vl_api_registration_file_index (reg) == VL_API_INVALID_FI)
+       seg_type = SSVM_SEGMENT_SHM;
+    }
+  else
+    {
+      if (options[APP_OPTIONS_FLAGS] & APP_OPTIONS_FLAGS_EVT_MQ_USE_EVENTFD)
+       {
+         clib_warning ("mq eventfds can only be used if socket transport is "
+                       "used for api");
+         return VNET_API_ERROR_APP_UNSUPPORTED_CFG;
+       }
+      seg_type = SSVM_SEGMENT_PRIVATE;
+    }
+
+  if (!application_verify_cfg (seg_type))
+    return VNET_API_ERROR_APP_UNSUPPORTED_CFG;
+
+  /* Check that the obvious things are properly set up */
+  application_verify_cb_fns (a->session_cb_vft);
+
+  app->flags = options[APP_OPTIONS_FLAGS];
+  app->cb_fns = *a->session_cb_vft;
+  app->ns_index = options[APP_OPTIONS_NAMESPACE];
+  app->proxied_transports = options[APP_OPTIONS_PROXY_TRANSPORT];
+  app->name = vec_dup (a->name);
+
+  /* If no scope enabled, default to global */
+  if (!application_has_global_scope (app)
+      && !application_has_local_scope (app))
+    app->flags |= APP_OPTIONS_FLAGS_USE_GLOBAL_SCOPE;
+
+  props = application_segment_manager_properties (app);
+  segment_manager_properties_init (props);
+  props->segment_size = options[APP_OPTIONS_ADD_SEGMENT_SIZE];
+  props->prealloc_fifos = options[APP_OPTIONS_PREALLOC_FIFO_PAIRS];
+  if (options[APP_OPTIONS_ADD_SEGMENT_SIZE])
+    {
+      props->add_segment_size = options[APP_OPTIONS_ADD_SEGMENT_SIZE];
+      props->add_segment = 1;
+    }
+  if (options[APP_OPTIONS_RX_FIFO_SIZE])
+    props->rx_fifo_size = options[APP_OPTIONS_RX_FIFO_SIZE];
+  if (options[APP_OPTIONS_TX_FIFO_SIZE])
+    props->tx_fifo_size = options[APP_OPTIONS_TX_FIFO_SIZE];
+  if (options[APP_OPTIONS_EVT_QUEUE_SIZE])
+    props->evt_q_size = options[APP_OPTIONS_EVT_QUEUE_SIZE];
+  if (options[APP_OPTIONS_FLAGS] & APP_OPTIONS_FLAGS_EVT_MQ_USE_EVENTFD)
+    props->use_mq_eventfd = 1;
+  if (options[APP_OPTIONS_TLS_ENGINE])
+    app->tls_engine = options[APP_OPTIONS_TLS_ENGINE];
+  props->segment_type = seg_type;
+
+  /* Add app to lookup by api_client_index table */
+  if (!application_is_builtin (app))
+    application_api_table_add (app->app_index, a->api_client_index);
+  else
+    application_name_table_add (app);
+
+  a->app_index = app->app_index;
+
+  APP_DBG ("New app name: %v api index: %u index %u", app->name,
+          app->api_client_index, app->app_index);
+
+  return 0;
+}
+
 void
-application_del (application_t * app)
+application_free (application_t * app)
 {
-  segment_manager_t *sm;
-  u64 handle;
-  u32 index, *handles = 0;
-  int i;
-  vnet_unbind_args_t _a, *a = &_a;
+  app_worker_map_t *wrk_map;
+  app_worker_t *app_wrk;
+  u32 table_index;
+  local_session_t *ll;
+  session_endpoint_t sep;
 
   /*
    * The app event queue allocated in first segment is cleared with
    * the segment manager. No need to explicitly free it.
    */
-  if (CLIB_DEBUG > 1)
-    clib_warning ("[%d] Delete app (%d)", getpid (), app->index);
+  APP_DBG ("Delete app name %v api index: %d index: %d", app->name,
+          app->api_client_index, app->app_index);
+
+  if (application_is_proxy (app))
+    application_remove_proxy (app);
+
+  /*
+   * Free workers
+   */
+
+  /* *INDENT-OFF* */
+  pool_flush (wrk_map, app->worker_maps, ({
+    app_wrk = app_worker_get (wrk_map->wrk_index);
+    app_worker_free (app_wrk);
+  }));
+  /* *INDENT-ON* */
+  pool_free (app->worker_maps);
+
+  /*
+   * Free local listeners. Global table unbinds stop local listeners
+   * as well, but if we have only local binds, these won't be cleaned up.
+   * Don't bother with local accepted sessions, we clean them when
+   * cleaning up the worker.
+   */
+  table_index = application_local_session_table (app);
+  /* *INDENT-OFF* */
+  pool_foreach (ll, app->local_listen_sessions, ({
+    application_local_listener_session_endpoint (ll, &sep);
+    session_lookup_del_session_endpoint (table_index, &sep);
+  }));
+  /* *INDENT-ON* */
+  pool_free (app->local_listen_sessions);
 
   /*
-   * Cleanup segment managers
+   * Cleanup remaining state
    */
-  if ((app->connects_seg_manager != (u32) ~ 0) &&
-      (app->connects_seg_manager != app->first_segment_manager))
+  if (application_is_builtin (app))
+    application_name_table_del (app);
+  vec_free (app->name);
+  vec_free (app->tls_cert);
+  vec_free (app->tls_key);
+  pool_put (app_main.app_pool, app);
+}
+
+void
+application_detach_process (application_t * app, u32 api_client_index)
+{
+  vnet_app_worker_add_del_args_t _args = { 0 }, *args = &_args;
+  app_worker_map_t *wrk_map;
+  u32 *wrks = 0, *wrk_index;
+  app_worker_t *app_wrk;
+
+  if (api_client_index == ~0)
+    {
+      application_free (app);
+      return;
+    }
+
+  APP_DBG ("Detaching for app %v index %u api client index %u", app->name,
+          app->app_index, app->api_client_index);
+
+  /* *INDENT-OFF* */
+  pool_foreach (wrk_map, app->worker_maps, ({
+    app_wrk = app_worker_get (wrk_map->wrk_index);
+    if (app_wrk->api_client_index == api_client_index)
+      vec_add1 (wrks, app_wrk->wrk_index);
+  }));
+  /* *INDENT-ON* */
+
+  if (!vec_len (wrks))
     {
-      sm = segment_manager_get (app->connects_seg_manager);
-      segment_manager_del (sm);
+      clib_warning ("no workers for app %u api_index %u", app->app_index,
+                   api_client_index);
+      return;
     }
 
+  args->app_index = app->app_index;
+  args->api_client_index = api_client_index;
+  vec_foreach (wrk_index, wrks)
+  {
+    app_wrk = app_worker_get (wrk_index[0]);
+    args->wrk_map_index = app_wrk->wrk_map_index;
+    args->is_add = 0;
+    vnet_app_worker_add_del (args);
+  }
+  vec_free (wrks);
+}
+
+app_worker_t *
+application_get_worker (application_t * app, u32 wrk_map_index)
+{
+  app_worker_map_t *map;
+  map = app_worker_map_get (app, wrk_map_index);
+  if (!map)
+    return 0;
+  return app_worker_get (map->wrk_index);
+}
+
+app_worker_t *
+application_get_default_worker (application_t * app)
+{
+  return application_get_worker (app, 0);
+}
+
+u32
+application_n_workers (application_t * app)
+{
+  return pool_elts (app->worker_maps);
+}
+
+app_worker_t *
+application_listener_select_worker (stream_session_t * ls, u8 is_local)
+{
+  app_listener_t *app_listener;
+  application_t *app;
+  u32 wrk_index;
+
+  app = application_get (ls->app_index);
+  if (!is_local)
+    app_listener = app_listener_get (app, ls->listener_db_index);
+  else
+    app_listener = app_local_listener_get (app, ls->listener_db_index);
+
+  wrk_index = clib_bitmap_next_set (app_listener->workers,
+                                   app_listener->accept_rotor + 1);
+  if (wrk_index == ~0)
+    wrk_index = clib_bitmap_first_set (app_listener->workers);
+
+  ASSERT (wrk_index != ~0);
+  app_listener->accept_rotor = wrk_index;
+  return application_get_worker (app, wrk_index);
+}
+
+app_worker_t *
+app_worker_alloc (application_t * app)
+{
+  app_worker_t *app_wrk;
+  pool_get (app_main.workers, app_wrk);
+  clib_memset (app_wrk, 0, sizeof (*app_wrk));
+  app_wrk->wrk_index = app_wrk - app_main.workers;
+  app_wrk->app_index = app->app_index;
+  app_wrk->wrk_map_index = ~0;
+  app_wrk->connects_seg_manager = APP_INVALID_SEGMENT_MANAGER_INDEX;
+  app_wrk->first_segment_manager = APP_INVALID_SEGMENT_MANAGER_INDEX;
+  app_wrk->local_segment_manager = APP_INVALID_SEGMENT_MANAGER_INDEX;
+  APP_DBG ("New app %v worker %u", app_get_name (app), app_wrk->wrk_index);
+  return app_wrk;
+}
+
+app_worker_t *
+app_worker_get (u32 wrk_index)
+{
+  return pool_elt_at_index (app_main.workers, wrk_index);
+}
+
+app_worker_t *
+app_worker_get_if_valid (u32 wrk_index)
+{
+  if (pool_is_free_index (app_main.workers, wrk_index))
+    return 0;
+  return pool_elt_at_index (app_main.workers, wrk_index);
+}
+
+void
+app_worker_free (app_worker_t * app_wrk)
+{
+  application_t *app = application_get (app_wrk->app_index);
+  vnet_unbind_args_t _a, *a = &_a;
+  u64 handle, *handles = 0;
+  segment_manager_t *sm;
+  u32 sm_index;
+  int i;
+
+  /*
+   *  Listener cleanup
+   */
+
   /* *INDENT-OFF* */
-  hash_foreach (handle, index, app->listeners_table,
+  hash_foreach (handle, sm_index, app_wrk->listeners_table,
   ({
     vec_add1 (handles, handle);
+    sm = segment_manager_get (sm_index);
+    sm->app_wrk_index = SEGMENT_MANAGER_INVALID_APP_INDEX;
   }));
   /* *INDENT-ON* */
 
-  /* Actual listener cleanup */
   for (i = 0; i < vec_len (handles); i++)
     {
-      a->app_index = app->index;
+      a->app_index = app->app_index;
+      a->wrk_map_index = app_wrk->wrk_map_index;
       a->handle = handles[i];
       /* seg manager is removed when unbind completes */
       vnet_unbind (a);
     }
 
-  if (app->first_segment_manager != ~0)
+  /*
+   * Connects segment manager cleanup
+   */
+
+  if (app_wrk->connects_seg_manager != APP_INVALID_SEGMENT_MANAGER_INDEX)
     {
-      sm = segment_manager_get (app->first_segment_manager);
-      segment_manager_first_segment_maybe_del (sm);
+      sm = segment_manager_get (app_wrk->connects_seg_manager);
+      sm->app_wrk_index = SEGMENT_MANAGER_INVALID_APP_INDEX;
+      segment_manager_init_del (sm);
     }
 
-  application_table_del (app);
-  pool_put (app_pool, app);
-}
+  /* If first segment manager is used by a listener */
+  if (app_wrk->first_segment_manager != APP_INVALID_SEGMENT_MANAGER_INDEX
+      && app_wrk->first_segment_manager != app_wrk->connects_seg_manager)
+    {
+      sm = segment_manager_get (app_wrk->first_segment_manager);
+      sm->first_is_protected = 0;
+      sm->app_wrk_index = SEGMENT_MANAGER_INVALID_APP_INDEX;
+      /* .. and has no fifos, e.g. it might be used for redirected sessions,
+       * remove it */
+      if (!segment_manager_has_fifos (sm))
+       segment_manager_del (sm);
+    }
 
-static void
-application_verify_cb_fns (session_cb_vft_t * cb_fns)
-{
-  if (cb_fns->session_accept_callback == 0)
-    clib_warning ("No accept callback function provided");
-  if (cb_fns->session_connected_callback == 0)
-    clib_warning ("No session connected callback function provided");
-  if (cb_fns->session_disconnect_callback == 0)
-    clib_warning ("No session disconnect callback function provided");
-  if (cb_fns->session_reset_callback == 0)
-    clib_warning ("No session reset callback function provided");
+  /*
+   * Local sessions
+   */
+  app_worker_local_sessions_free (app_wrk);
+
+  pool_put (app_main.workers, app_wrk);
+  if (CLIB_DEBUG)
+    clib_memset (app_wrk, 0xfe, sizeof (*app_wrk));
 }
 
 int
-application_init (application_t * app, u32 api_client_index, u64 * options,
-                 session_cb_vft_t * cb_fns)
+app_worker_alloc_and_init (application_t * app, app_worker_t ** wrk)
 {
+  app_worker_map_t *wrk_map;
+  app_worker_t *app_wrk;
   segment_manager_t *sm;
-  segment_manager_properties_t *props;
-  u32 app_evt_queue_size, first_seg_size;
   int rv;
 
-  app_evt_queue_size = options[APP_EVT_QUEUE_SIZE] > 0 ?
-    options[APP_EVT_QUEUE_SIZE] : default_app_evt_queue_size;
+  app_wrk = app_worker_alloc (app);
+  wrk_map = app_worker_map_alloc (app);
+  wrk_map->wrk_index = app_wrk->wrk_index;
+  app_wrk->wrk_map_index = app_worker_map_index (app, wrk_map);
 
-  /* Setup segment manager */
+  /*
+   * Setup first segment manager
+   */
   sm = segment_manager_new ();
-  sm->app_index = app->index;
-  props = &app->sm_properties;
-  props->add_segment_size = options[SESSION_OPTIONS_ADD_SEGMENT_SIZE];
-  props->rx_fifo_size = options[SESSION_OPTIONS_RX_FIFO_SIZE];
-  props->tx_fifo_size = options[SESSION_OPTIONS_TX_FIFO_SIZE];
-  props->add_segment = props->add_segment_size != 0;
-  props->preallocated_fifo_pairs = options[APP_OPTIONS_PREALLOC_FIFO_PAIRS];
-  props->use_private_segment = options[APP_OPTIONS_FLAGS]
-    & APP_OPTIONS_FLAGS_BUILTIN_APP;
-  props->private_segment_count = options[APP_OPTIONS_PRIVATE_SEGMENT_COUNT];
-  props->private_segment_size = options[APP_OPTIONS_PRIVATE_SEGMENT_SIZE];
-
-  first_seg_size = options[SESSION_OPTIONS_SEGMENT_SIZE];
-  if ((rv = segment_manager_init (sm, props, first_seg_size)))
-    return rv;
+  sm->app_wrk_index = app_wrk->wrk_index;
 
-  app->first_segment_manager = segment_manager_index (sm);
-  app->api_client_index = api_client_index;
-  app->flags = options[APP_OPTIONS_FLAGS];
-  app->cb_fns = *cb_fns;
+  if ((rv = segment_manager_init (sm, app->sm_properties.segment_size,
+                                 app->sm_properties.prealloc_fifos)))
+    {
+      app_worker_free (app_wrk);
+      return rv;
+    }
+  sm->first_is_protected = 1;
 
-  /* Allocate app event queue in the first shared-memory segment */
-  app->event_queue = segment_manager_alloc_queue (sm, app_evt_queue_size);
+  /*
+   * Setup app worker
+   */
+  app_wrk->first_segment_manager = segment_manager_index (sm);
+  app_wrk->listeners_table = hash_create (0, sizeof (u64));
+  app_wrk->event_queue = segment_manager_event_queue (sm);
+  app_wrk->app_is_builtin = application_is_builtin (app);
 
-  /* Check that the obvious things are properly set up */
-  application_verify_cb_fns (cb_fns);
+  /*
+   * Segment manager for local sessions
+   */
+  sm = segment_manager_new ();
+  sm->app_wrk_index = app_wrk->wrk_index;
+  app_wrk->local_segment_manager = segment_manager_index (sm);
+  app_wrk->local_connects = hash_create (0, sizeof (u64));
 
-  /* Add app to lookup by api_client_index table */
-  application_table_add (app);
+  *wrk = app_wrk;
 
   return 0;
 }
 
 application_t *
-application_get (u32 index)
-{
-  return pool_elt_at_index (app_pool, index);
-}
-
-application_t *
-application_get_if_valid (u32 index)
+app_worker_get_app (u32 wrk_index)
 {
-  if (pool_is_free_index (app_pool, index))
+  app_worker_t *app_wrk;
+  app_wrk = app_worker_get_if_valid (wrk_index);
+  if (!app_wrk)
     return 0;
-
-  return pool_elt_at_index (app_pool, index);
-}
-
-u32
-application_get_index (application_t * app)
-{
-  return app - app_pool;
+  return application_get_if_valid (app_wrk->app_index);
 }
 
 static segment_manager_t *
-application_alloc_segment_manager (application_t * app)
+app_worker_alloc_segment_manager (app_worker_t * app_wrk)
 {
   segment_manager_t *sm = 0;
 
-  if (app->first_segment_manager != (u32) ~ 0)
+  /* If the first segment manager is not in use, don't allocate a new one */
+  if (app_wrk->first_segment_manager != APP_INVALID_SEGMENT_MANAGER_INDEX
+      && app_wrk->first_segment_manager_in_use == 0)
     {
-      sm = segment_manager_get (app->first_segment_manager);
+      sm = segment_manager_get (app_wrk->first_segment_manager);
+      app_wrk->first_segment_manager_in_use = 1;
       return sm;
     }
 
   sm = segment_manager_new ();
-  if (segment_manager_init (sm, &app->sm_properties, 0))
-    return 0;
+  sm->app_wrk_index = app_wrk->wrk_index;
+
   return sm;
 }
 
+int
+app_worker_start_listen (app_worker_t * app_wrk, stream_session_t * ls)
+{
+  segment_manager_t *sm;
+
+  /* Allocate segment manager. All sessions derived out of a listen session
+   * have fifos allocated by the same segment manager. */
+  if (!(sm = app_worker_alloc_segment_manager (app_wrk)))
+    return -1;
+
+  /* Add to app's listener table. Useful to find all child listeners
+   * when app goes down, although, just for unbinding this is not needed */
+  hash_set (app_wrk->listeners_table, listen_session_get_handle (ls),
+           segment_manager_index (sm));
+
+  if (!ls->server_rx_fifo
+      && session_transport_service_type (ls) == TRANSPORT_SERVICE_CL)
+    {
+      if (session_alloc_fifos (sm, ls))
+       return -1;
+    }
+  return 0;
+}
+
+int
+app_worker_stop_listen (app_worker_t * app_wrk, session_handle_t handle)
+{
+  segment_manager_t *sm;
+  uword *sm_indexp;
+
+  sm_indexp = hash_get (app_wrk->listeners_table, handle);
+  if (PREDICT_FALSE (!sm_indexp))
+    {
+      clib_warning ("listener handle was removed %llu!", handle);
+      return -1;
+    }
+
+  sm = segment_manager_get (*sm_indexp);
+  if (app_wrk->first_segment_manager == *sm_indexp)
+    {
+      /* Delete sessions but don't remove segment manager */
+      app_wrk->first_segment_manager_in_use = 0;
+      segment_manager_del_sessions (sm);
+    }
+  else
+    {
+      segment_manager_init_del (sm);
+    }
+  hash_unset (app_wrk->listeners_table, handle);
+
+  return 0;
+}
+
 /**
  * Start listening local transport endpoint for requested transport.
  *
@@ -245,181 +730,1299 @@ application_alloc_segment_manager (application_t * app)
  * it's own specific listening connection.
  */
 int
-application_start_listen (application_t * srv, session_type_t session_type,
-                         transport_endpoint_t * tep, u64 * res)
+application_start_listen (application_t * app,
+                         session_endpoint_cfg_t * sep_ext,
+                         session_handle_t * res)
+{
+  app_listener_t *app_listener;
+  u32 table_index, fib_proto;
+  session_endpoint_t *sep;
+  app_worker_t *app_wrk;
+  stream_session_t *ls;
+  session_handle_t lh;
+  session_type_t sst;
+
+  /*
+   * Check if sep is already listened on
+   */
+  sep = (session_endpoint_t *) sep_ext;
+  fib_proto = session_endpoint_fib_proto (sep);
+  table_index = application_session_table (app, fib_proto);
+  lh = session_lookup_endpoint_listener (table_index, sep, 1);
+  if (lh != SESSION_INVALID_HANDLE)
+    {
+      ls = listen_session_get_from_handle (lh);
+      if (ls->app_index != app->app_index)
+       return VNET_API_ERROR_ADDRESS_IN_USE;
+
+      app_wrk = app_worker_get (sep_ext->app_wrk_index);
+      if (ls->app_wrk_index == app_wrk->wrk_index)
+       return VNET_API_ERROR_ADDRESS_IN_USE;
+
+      if (app_worker_start_listen (app_wrk, ls))
+       return -1;
+
+      app_listener = app_listener_get (app, ls->listener_db_index);
+      app_listener->workers = clib_bitmap_set (app_listener->workers,
+                                              app_wrk->wrk_map_index, 1);
+
+      *res = listen_session_get_handle (ls);
+      return 0;
+    }
+
+  /*
+   * Allocate new listener for application
+   */
+  sst = session_type_from_proto_and_ip (sep_ext->transport_proto,
+                                       sep_ext->is_ip4);
+  ls = listen_session_new (0, sst);
+  ls->app_index = app->app_index;
+  lh = listen_session_get_handle (ls);
+  if (session_listen (ls, sep_ext))
+    goto err;
+
+
+  ls = listen_session_get_from_handle (lh);
+  app_listener = app_listener_alloc (app);
+  ls->listener_db_index = app_listener->al_index;
+
+  /*
+   * Setup app worker as a listener
+   */
+  app_wrk = app_worker_get (sep_ext->app_wrk_index);
+  ls->app_wrk_index = app_wrk->wrk_index;
+  if (app_worker_start_listen (app_wrk, ls))
+    goto err;
+  app_listener->workers = clib_bitmap_set (app_listener->workers,
+                                          app_wrk->wrk_map_index, 1);
+
+  *res = lh;
+  return 0;
+
+err:
+  listen_session_del (ls);
+  return -1;
+}
+
+/**
+ * Stop listening on session associated to handle
+ *
+ * @param handle       listener handle
+ * @param app_index    index of the app owning the handle.
+ * @param app_wrk_index        index of the worker requesting the stop
+ */
+int
+application_stop_listen (u32 app_index, u32 app_wrk_index,
+                        session_handle_t handle)
+{
+  app_listener_t *app_listener;
+  stream_session_t *listener;
+  app_worker_t *app_wrk;
+  application_t *app;
+
+  listener = listen_session_get_from_handle (handle);
+  app = application_get (app_index);
+  if (PREDICT_FALSE (!app || app->app_index != listener->app_index))
+    {
+      clib_warning ("app doesn't own handle %llu!", handle);
+      return -1;
+    }
+
+  app_listener = app_listener_get (app, listener->listener_db_index);
+  if (!clib_bitmap_get (app_listener->workers, app_wrk_index))
+    {
+      clib_warning ("worker %u not listening on handle %lu", app_wrk_index,
+                   handle);
+      return 0;
+    }
+
+  app_wrk = application_get_worker (app, app_wrk_index);
+  app_worker_stop_listen (app_wrk, handle);
+  clib_bitmap_set_no_check (app_listener->workers, app_wrk_index, 0);
+
+  if (clib_bitmap_is_zero (app_listener->workers))
+    {
+      session_stop_listen (listener);
+      app_listener_free (app, app_listener);
+      listen_session_del (listener);
+    }
+
+  return 0;
+}
+
+int
+app_worker_open_session (app_worker_t * app, session_endpoint_t * sep,
+                        u32 api_context)
+{
+  int rv;
+
+  /* Make sure we have a segment manager for connects */
+  app_worker_alloc_connects_segment_manager (app);
+
+  if ((rv = session_open (app->wrk_index, sep, api_context)))
+    return rv;
+
+  return 0;
+}
+
+int
+app_worker_alloc_connects_segment_manager (app_worker_t * app_wrk)
 {
   segment_manager_t *sm;
+
+  if (app_wrk->connects_seg_manager == APP_INVALID_SEGMENT_MANAGER_INDEX)
+    {
+      sm = app_worker_alloc_segment_manager (app_wrk);
+      if (sm == 0)
+       return -1;
+      app_wrk->connects_seg_manager = segment_manager_index (sm);
+    }
+  return 0;
+}
+
+segment_manager_t *
+app_worker_get_connect_segment_manager (app_worker_t * app)
+{
+  ASSERT (app->connects_seg_manager != (u32) ~ 0);
+  return segment_manager_get (app->connects_seg_manager);
+}
+
+segment_manager_t *
+app_worker_get_listen_segment_manager (app_worker_t * app,
+                                      stream_session_t * listener)
+{
+  uword *smp;
+  smp = hash_get (app->listeners_table, listen_session_get_handle (listener));
+  ASSERT (smp != 0);
+  return segment_manager_get (*smp);
+}
+
+clib_error_t *
+vnet_app_worker_add_del (vnet_app_worker_add_del_args_t * a)
+{
+  svm_fifo_segment_private_t *fs;
+  app_worker_map_t *wrk_map;
+  app_worker_t *app_wrk;
+  segment_manager_t *sm;
+  application_t *app;
+  int rv;
+
+  app = application_get (a->app_index);
+  if (!app)
+    return clib_error_return_code (0, VNET_API_ERROR_INVALID_VALUE, 0,
+                                  "App %u does not exist", a->app_index);
+
+  if (a->is_add)
+    {
+      if ((rv = app_worker_alloc_and_init (app, &app_wrk)))
+       return clib_error_return_code (0, rv, 0, "app wrk init: %d", rv);
+
+      /* Map worker api index to the app */
+      app_wrk->api_client_index = a->api_client_index;
+      application_api_table_add (app->app_index, a->api_client_index);
+
+      sm = segment_manager_get (app_wrk->first_segment_manager);
+      fs = segment_manager_get_segment_w_lock (sm, 0);
+      a->segment = &fs->ssvm;
+      a->segment_handle = segment_manager_segment_handle (sm, fs);
+      segment_manager_segment_reader_unlock (sm);
+      a->evt_q = app_wrk->event_queue;
+      a->wrk_map_index = app_wrk->wrk_map_index;
+    }
+  else
+    {
+      wrk_map = app_worker_map_get (app, a->wrk_map_index);
+      if (!wrk_map)
+       return clib_error_return_code (0, VNET_API_ERROR_INVALID_VALUE, 0,
+                                      "App %u does not have worker %u",
+                                      app->app_index, a->wrk_map_index);
+      app_wrk = app_worker_get (wrk_map->wrk_index);
+      if (!app_wrk)
+       return clib_error_return_code (0, VNET_API_ERROR_INVALID_VALUE, 0,
+                                      "No worker %u", a->wrk_map_index);
+      application_api_table_del (app_wrk->api_client_index);
+      app_worker_free (app_wrk);
+      app_worker_map_free (app, wrk_map);
+      if (application_n_workers (app) == 0)
+       application_free (app);
+    }
+  return 0;
+}
+
+segment_manager_t *
+application_get_local_segment_manager (app_worker_t * app)
+{
+  return segment_manager_get (app->local_segment_manager);
+}
+
+segment_manager_t *
+application_get_local_segment_manager_w_session (app_worker_t * app,
+                                                local_session_t * ls)
+{
+  stream_session_t *listener;
+  if (application_local_session_listener_has_transport (ls))
+    {
+      listener = listen_session_get (ls->listener_index);
+      return app_worker_get_listen_segment_manager (app, listener);
+    }
+  return segment_manager_get (app->local_segment_manager);
+}
+
+int
+application_is_proxy (application_t * app)
+{
+  return (app->flags & APP_OPTIONS_FLAGS_IS_PROXY);
+}
+
+int
+application_is_builtin (application_t * app)
+{
+  return (app->flags & APP_OPTIONS_FLAGS_IS_BUILTIN);
+}
+
+int
+application_is_builtin_proxy (application_t * app)
+{
+  return (application_is_proxy (app) && application_is_builtin (app));
+}
+
+u8
+application_has_local_scope (application_t * app)
+{
+  return app->flags & APP_OPTIONS_FLAGS_USE_LOCAL_SCOPE;
+}
+
+u8
+application_has_global_scope (application_t * app)
+{
+  return app->flags & APP_OPTIONS_FLAGS_USE_GLOBAL_SCOPE;
+}
+
+u8
+application_use_mq_for_ctrl (application_t * app)
+{
+  return app->flags & APP_OPTIONS_FLAGS_USE_MQ_FOR_CTRL_MSGS;
+}
+
+/**
+ * Send an API message to the external app, to map new segment
+ */
+int
+app_worker_add_segment_notify (u32 app_wrk_index, u64 segment_handle)
+{
+  app_worker_t *app_wrk = app_worker_get (app_wrk_index);
+  application_t *app = application_get (app_wrk->app_index);
+  return app->cb_fns.add_segment_callback (app_wrk->api_client_index,
+                                          segment_handle);
+}
+
+u32
+application_n_listeners (app_worker_t * app)
+{
+  return hash_elts (app->listeners_table);
+}
+
+stream_session_t *
+app_worker_first_listener (app_worker_t * app, u8 fib_proto,
+                          u8 transport_proto)
+{
+  stream_session_t *listener;
+  u64 handle;
+  u32 sm_index;
+  u8 sst;
+
+  sst = session_type_from_proto_and_ip (transport_proto,
+                                       fib_proto == FIB_PROTOCOL_IP4);
+
+  /* *INDENT-OFF* */
+   hash_foreach (handle, sm_index, app->listeners_table, ({
+     listener = listen_session_get_from_handle (handle);
+     if (listener->session_type == sst
+        && listener->enqueue_epoch != SESSION_PROXY_LISTENER_INDEX)
+       return listener;
+   }));
+  /* *INDENT-ON* */
+
+  return 0;
+}
+
+u8
+app_worker_application_is_builtin (app_worker_t * app_wrk)
+{
+  return app_wrk->app_is_builtin;
+}
+
+stream_session_t *
+application_proxy_listener (app_worker_t * app, u8 fib_proto,
+                           u8 transport_proto)
+{
+  stream_session_t *listener;
+  u64 handle;
+  u32 sm_index;
+  u8 sst;
+
+  sst = session_type_from_proto_and_ip (transport_proto,
+                                       fib_proto == FIB_PROTOCOL_IP4);
+
+  /* *INDENT-OFF* */
+   hash_foreach (handle, sm_index, app->listeners_table, ({
+     listener = listen_session_get_from_handle (handle);
+     if (listener->session_type == sst
+        && listener->enqueue_epoch == SESSION_PROXY_LISTENER_INDEX)
+       return listener;
+   }));
+  /* *INDENT-ON* */
+
+  return 0;
+}
+
+static clib_error_t *
+application_start_stop_proxy_fib_proto (application_t * app, u8 fib_proto,
+                                       u8 transport_proto, u8 is_start)
+{
+  app_namespace_t *app_ns = app_namespace_get (app->ns_index);
+  u8 is_ip4 = (fib_proto == FIB_PROTOCOL_IP4);
+  session_endpoint_cfg_t sep = SESSION_ENDPOINT_CFG_NULL;
+  transport_connection_t *tc;
+  app_worker_t *app_wrk;
   stream_session_t *s;
   u64 handle;
 
-  s = listen_session_new (session_type);
-  s->app_index = srv->index;
+  /* TODO decide if we want proxy to be enabled for all workers */
+  app_wrk = application_get_default_worker (app);
+  if (is_start)
+    {
+      s = app_worker_first_listener (app_wrk, fib_proto, transport_proto);
+      if (!s)
+       {
+         sep.is_ip4 = is_ip4;
+         sep.fib_index = app_namespace_get_fib_index (app_ns, fib_proto);
+         sep.sw_if_index = app_ns->sw_if_index;
+         sep.transport_proto = transport_proto;
+         sep.app_wrk_index = app_wrk->wrk_index;       /* only default */
+         application_start_listen (app, &sep, &handle);
+         s = listen_session_get_from_handle (handle);
+         s->enqueue_epoch = SESSION_PROXY_LISTENER_INDEX;
+       }
+    }
+  else
+    {
+      s = application_proxy_listener (app_wrk, fib_proto, transport_proto);
+      ASSERT (s);
+    }
 
-  if (stream_session_listen (s, tep))
-    goto err;
+  tc = listen_session_get_transport (s);
 
-  /* Allocate segment manager. All sessions derived out of a listen session
-   * have fifos allocated by the same segment manager. */
-  sm = application_alloc_segment_manager (srv);
-  if (sm == 0)
-    goto err;
+  if (!ip_is_zero (&tc->lcl_ip, 1))
+    {
+      u32 sti;
+      sep.is_ip4 = is_ip4;
+      sep.fib_index = app_namespace_get_fib_index (app_ns, fib_proto);
+      sep.transport_proto = transport_proto;
+      sep.port = 0;
+      sti = session_lookup_get_index_for_fib (fib_proto, sep.fib_index);
+      if (is_start)
+       session_lookup_add_session_endpoint (sti,
+                                            (session_endpoint_t *) & sep,
+                                            s->session_index);
+      else
+       session_lookup_del_session_endpoint (sti,
+                                            (session_endpoint_t *) & sep);
+    }
+
+  return 0;
+}
+
+static void
+application_start_stop_proxy_local_scope (application_t * app,
+                                         u8 transport_proto, u8 is_start)
+{
+  session_endpoint_t sep = SESSION_ENDPOINT_NULL;
+  app_namespace_t *app_ns;
+  app_ns = app_namespace_get (app->ns_index);
+  sep.is_ip4 = 1;
+  sep.transport_proto = transport_proto;
+  sep.port = 0;
+
+  if (is_start)
+    {
+      session_lookup_add_session_endpoint (app_ns->local_table_index, &sep,
+                                          app->app_index);
+      sep.is_ip4 = 0;
+      session_lookup_add_session_endpoint (app_ns->local_table_index, &sep,
+                                          app->app_index);
+    }
+  else
+    {
+      session_lookup_del_session_endpoint (app_ns->local_table_index, &sep);
+      sep.is_ip4 = 0;
+      session_lookup_del_session_endpoint (app_ns->local_table_index, &sep);
+    }
+}
+
+void
+application_start_stop_proxy (application_t * app,
+                             transport_proto_t transport_proto, u8 is_start)
+{
+  if (application_has_local_scope (app))
+    application_start_stop_proxy_local_scope (app, transport_proto, is_start);
+
+  if (application_has_global_scope (app))
+    {
+      application_start_stop_proxy_fib_proto (app, FIB_PROTOCOL_IP4,
+                                             transport_proto, is_start);
+      application_start_stop_proxy_fib_proto (app, FIB_PROTOCOL_IP6,
+                                             transport_proto, is_start);
+    }
+}
+
+void
+application_setup_proxy (application_t * app)
+{
+  u16 transports = app->proxied_transports;
+  transport_proto_t tp;
+
+  ASSERT (application_is_proxy (app));
+
+  /* *INDENT-OFF* */
+  transport_proto_foreach (tp, ({
+    if (transports & (1 << tp))
+      application_start_stop_proxy (app, tp, 1);
+  }));
+  /* *INDENT-ON* */
+}
+
+void
+application_remove_proxy (application_t * app)
+{
+  u16 transports = app->proxied_transports;
+  transport_proto_t tp;
+
+  ASSERT (application_is_proxy (app));
+
+  /* *INDENT-OFF* */
+  transport_proto_foreach (tp, ({
+    if (transports & (1 << tp))
+      application_start_stop_proxy (app, tp, 0);
+  }));
+  /* *INDENT-ON* */
+}
+
+segment_manager_properties_t *
+application_segment_manager_properties (application_t * app)
+{
+  return &app->sm_properties;
+}
+
+segment_manager_properties_t *
+application_get_segment_manager_properties (u32 app_index)
+{
+  application_t *app = application_get (app_index);
+  return &app->sm_properties;
+}
+
+static inline int
+app_enqueue_evt (svm_msg_q_t * mq, svm_msg_q_msg_t * msg, u8 lock)
+{
+  if (PREDICT_FALSE (svm_msg_q_is_full (mq)))
+    {
+      clib_warning ("evt q full");
+      svm_msg_q_free_msg (mq, msg);
+      if (lock)
+       svm_msg_q_unlock (mq);
+      return -1;
+    }
+
+  if (lock)
+    {
+      svm_msg_q_add_and_unlock (mq, msg);
+      return 0;
+    }
+
+  /* Even when not locking the ring, we must wait for queue mutex */
+  if (svm_msg_q_add (mq, msg, SVM_Q_WAIT))
+    {
+      clib_warning ("msg q add returned");
+      return -1;
+    }
+  return 0;
+}
+
+static inline int
+app_send_io_evt_rx (app_worker_t * app_wrk, stream_session_t * s, u8 lock)
+{
+  session_event_t *evt;
+  svm_msg_q_msg_t msg;
+  svm_msg_q_t *mq;
+
+  if (PREDICT_FALSE (s->session_state != SESSION_STATE_READY
+                    && s->session_state != SESSION_STATE_LISTENING))
+    {
+      /* Session is closed so app will never clean up. Flush rx fifo */
+      if (s->session_state == SESSION_STATE_CLOSED)
+       svm_fifo_dequeue_drop_all (s->server_rx_fifo);
+      return 0;
+    }
+
+  if (app_worker_application_is_builtin (app_wrk))
+    {
+      application_t *app = application_get (app_wrk->app_index);
+      return app->cb_fns.builtin_app_rx_callback (s);
+    }
+
+  if (svm_fifo_has_event (s->server_rx_fifo)
+      || svm_fifo_is_empty (s->server_rx_fifo))
+    return 0;
+
+  mq = app_wrk->event_queue;
+  if (lock)
+    svm_msg_q_lock (mq);
+
+  if (PREDICT_FALSE (svm_msg_q_ring_is_full (mq, SESSION_MQ_IO_EVT_RING)))
+    {
+      clib_warning ("evt q rings full");
+      if (lock)
+       svm_msg_q_unlock (mq);
+      return -1;
+    }
+
+  msg = svm_msg_q_alloc_msg_w_ring (mq, SESSION_MQ_IO_EVT_RING);
+  ASSERT (!svm_msg_q_msg_is_invalid (&msg));
+
+  evt = (session_event_t *) svm_msg_q_msg_data (mq, &msg);
+  evt->fifo = s->server_rx_fifo;
+  evt->event_type = FIFO_EVENT_APP_RX;
+
+  (void) svm_fifo_set_event (s->server_rx_fifo);
+
+  if (app_enqueue_evt (mq, &msg, lock))
+    return -1;
+  return 0;
+}
+
+static inline int
+app_send_io_evt_tx (app_worker_t * app_wrk, stream_session_t * s, u8 lock)
+{
+  svm_msg_q_t *mq;
+  session_event_t *evt;
+  svm_msg_q_msg_t msg;
+
+  if (app_worker_application_is_builtin (app_wrk))
+    return 0;
+
+  mq = app_wrk->event_queue;
+  if (lock)
+    svm_msg_q_lock (mq);
+
+  if (PREDICT_FALSE (svm_msg_q_ring_is_full (mq, SESSION_MQ_IO_EVT_RING)))
+    {
+      clib_warning ("evt q rings full");
+      if (lock)
+       svm_msg_q_unlock (mq);
+      return -1;
+    }
+
+  msg = svm_msg_q_alloc_msg_w_ring (mq, SESSION_MQ_IO_EVT_RING);
+  ASSERT (!svm_msg_q_msg_is_invalid (&msg));
+
+  evt = (session_event_t *) svm_msg_q_msg_data (mq, &msg);
+  evt->event_type = FIFO_EVENT_APP_TX;
+  evt->fifo = s->server_tx_fifo;
+
+  return app_enqueue_evt (mq, &msg, lock);
+}
+
+/* *INDENT-OFF* */
+typedef int (app_send_evt_handler_fn) (app_worker_t *app,
+                                      stream_session_t *s,
+                                      u8 lock);
+static app_send_evt_handler_fn * const app_send_evt_handler_fns[3] = {
+    app_send_io_evt_rx,
+    0,
+    app_send_io_evt_tx,
+};
+/* *INDENT-ON* */
+
+/**
+ * Send event to application
+ *
+ * Logic from queue perspective is non-blocking. If there's
+ * not enough space to enqueue a message, we return.
+ */
+int
+app_worker_send_event (app_worker_t * app, stream_session_t * s, u8 evt_type)
+{
+  ASSERT (app && evt_type <= FIFO_EVENT_APP_TX);
+  return app_send_evt_handler_fns[evt_type] (app, s, 0 /* lock */ );
+}
+
+/**
+ * Send event to application
+ *
+ * Logic from queue perspective is blocking. However, if queue is full,
+ * we return.
+ */
+int
+app_worker_lock_and_send_event (app_worker_t * app, stream_session_t * s,
+                               u8 evt_type)
+{
+  return app_send_evt_handler_fns[evt_type] (app, s, 1 /* lock */ );
+}
+
+local_session_t *
+application_local_session_alloc (app_worker_t * app_wrk)
+{
+  local_session_t *s;
+  pool_get (app_wrk->local_sessions, s);
+  clib_memset (s, 0, sizeof (*s));
+  s->app_wrk_index = app_wrk->wrk_index;
+  s->session_index = s - app_wrk->local_sessions;
+  s->session_type = session_type_from_proto_and_ip (TRANSPORT_PROTO_NONE, 0);
+  return s;
+}
+
+void
+application_local_session_free (app_worker_t * app, local_session_t * s)
+{
+  pool_put (app->local_sessions, s);
+  if (CLIB_DEBUG)
+    clib_memset (s, 0xfc, sizeof (*s));
+}
+
+local_session_t *
+application_get_local_session (app_worker_t * app_wrk, u32 session_index)
+{
+  if (pool_is_free_index (app_wrk->local_sessions, session_index))
+    return 0;
+  return pool_elt_at_index (app_wrk->local_sessions, session_index);
+}
+
+local_session_t *
+application_get_local_session_from_handle (session_handle_t handle)
+{
+  app_worker_t *server_wrk;
+  u32 session_index, server_wrk_index;
+  local_session_parse_handle (handle, &server_wrk_index, &session_index);
+  server_wrk = app_worker_get_if_valid (server_wrk_index);
+  if (!server_wrk)
+    return 0;
+  return application_get_local_session (server_wrk, session_index);
+}
+
+local_session_t *
+application_local_listen_session_alloc (application_t * app)
+{
+  local_session_t *ll;
+  pool_get (app->local_listen_sessions, ll);
+  clib_memset (ll, 0, sizeof (*ll));
+  return ll;
+}
+
+u32
+application_local_listener_index (application_t * app, local_session_t * ll)
+{
+  return (ll - app->local_listen_sessions);
+}
+
+void
+application_local_listen_session_free (application_t * app,
+                                      local_session_t * ll)
+{
+  pool_put (app->local_listen_sessions, ll);
+  if (CLIB_DEBUG)
+    clib_memset (ll, 0xfb, sizeof (*ll));
+}
+
+int
+application_start_local_listen (application_t * app,
+                               session_endpoint_cfg_t * sep_ext,
+                               session_handle_t * handle)
+{
+  app_listener_t *app_listener;
+  session_endpoint_t *sep;
+  app_worker_t *app_wrk;
+  session_handle_t lh;
+  local_session_t *ll;
+  u32 table_index;
+
+  sep = (session_endpoint_t *) sep_ext;
+  table_index = application_local_session_table (app);
+  app_wrk = app_worker_get (sep_ext->app_wrk_index);
+
+  /* An exact sep match, as opposed to session_lookup_local_listener */
+  lh = session_lookup_endpoint_listener (table_index, sep, 1);
+  if (lh != SESSION_INVALID_HANDLE)
+    {
+      ll = application_get_local_listener_w_handle (lh);
+      if (ll->app_index != app->app_index)
+       return VNET_API_ERROR_ADDRESS_IN_USE;
+
+      if (ll->app_wrk_index == app_wrk->wrk_index)
+       return VNET_API_ERROR_ADDRESS_IN_USE;
+
+      app_listener = app_local_listener_get (app, ll->listener_db_index);
+      app_listener->workers = clib_bitmap_set (app_listener->workers,
+                                              app_wrk->wrk_map_index, 1);
+      *handle = application_local_session_handle (ll);
+      return 0;
+    }
+
+  ll = application_local_listen_session_alloc (app);
+  ll->session_type = session_type_from_proto_and_ip (TRANSPORT_PROTO_NONE, 0);
+  ll->app_wrk_index = app_wrk->app_index;
+  ll->session_index = application_local_listener_index (app, ll);
+  ll->port = sep_ext->port;
+  /* Store the original session type for the unbind */
+  ll->listener_session_type =
+    session_type_from_proto_and_ip (sep_ext->transport_proto,
+                                   sep_ext->is_ip4);
+  ll->transport_listener_index = ~0;
+  ll->app_index = app->app_index;
+
+  app_listener = app_local_listener_alloc (app);
+  ll->listener_db_index = app_listener->al_index;
+  app_listener->workers = clib_bitmap_set (app_listener->workers,
+                                          app_wrk->wrk_map_index, 1);
+
+  *handle = application_local_session_handle (ll);
+  session_lookup_add_session_endpoint (table_index, sep, *handle);
+
+  return 0;
+}
+
+/**
+ * Clean up local session table. If we have a listener session use it to
+ * find the port and proto. If not, the handle must be a local table handle
+ * so parse it.
+ */
+int
+application_stop_local_listen (u32 app_index, u32 wrk_map_index,
+                              session_handle_t lh)
+{
+  session_endpoint_t sep = SESSION_ENDPOINT_NULL;
+  u32 table_index, ll_index, server_index;
+  app_listener_t *app_listener;
+  app_worker_t *server_wrk;
+  stream_session_t *sl = 0;
+  local_session_t *ll, *ls;
+  application_t *server;
+
+  server = application_get (app_index);
+  table_index = application_local_session_table (server);
+
+  /* We have both local and global table binds. Figure from global what
+   * the sep we should be cleaning up is.
+   */
+  if (!session_handle_is_local (lh))
+    {
+      sl = listen_session_get_from_handle (lh);
+      if (!sl || listen_session_get_local_session_endpoint (sl, &sep))
+       {
+         clib_warning ("broken listener");
+         return -1;
+       }
+      lh = session_lookup_endpoint_listener (table_index, &sep, 0);
+      if (lh == SESSION_INVALID_HANDLE)
+       return -1;
+    }
+
+  local_session_parse_handle (lh, &server_index, &ll_index);
+  if (PREDICT_FALSE (server_index != app_index))
+    {
+      clib_warning ("app %u does not own local handle 0x%lx", app_index, lh);
+      return -1;
+    }
+
+  ll = application_get_local_listen_session (server, ll_index);
+  if (PREDICT_FALSE (!ll))
+    {
+      clib_warning ("no local listener");
+      return -1;
+    }
+
+  app_listener = app_local_listener_get (server, ll->listener_db_index);
+  if (!clib_bitmap_get (app_listener->workers, wrk_map_index))
+    {
+      clib_warning ("app wrk %u not listening on handle %lu", wrk_map_index,
+                   lh);
+      return -1;
+    }
+
+  server_wrk = application_get_worker (server, wrk_map_index);
+  /* *INDENT-OFF* */
+  pool_foreach (ls, server_wrk->local_sessions, ({
+    if (ls->listener_index == ll->session_index)
+      application_local_session_disconnect (server_wrk->app_index, ls);
+  }));
+  /* *INDENT-ON* */
+
+  clib_bitmap_set_no_check (app_listener->workers, wrk_map_index, 0);
+  if (clib_bitmap_is_zero (app_listener->workers))
+    {
+      app_local_listener_free (server, app_listener);
+      application_local_listener_session_endpoint (ll, &sep);
+      session_lookup_del_session_endpoint (table_index, &sep);
+      application_local_listen_session_free (server, ll);
+    }
+
+  return 0;
+}
+
+static void
+application_local_session_fix_eventds (svm_msg_q_t * sq, svm_msg_q_t * cq)
+{
+  int fd;
+
+  /*
+   * segment manager initializes only the producer eventds, since vpp is
+   * typically the producer. But for local sessions, we also pass to the
+   * apps the mqs they listen on for events from peer apps, so they are also
+   * consumer fds.
+   */
+  fd = svm_msg_q_get_producer_eventfd (sq);
+  svm_msg_q_set_consumer_eventfd (sq, fd);
+  fd = svm_msg_q_get_producer_eventfd (cq);
+  svm_msg_q_set_consumer_eventfd (cq, fd);
+}
+
+int
+application_local_session_connect (app_worker_t * client_wrk,
+                                  app_worker_t * server_wrk,
+                                  local_session_t * ll, u32 opaque)
+{
+  u32 seg_size, evt_q_sz, evt_q_elts, margin = 16 << 10;
+  u32 round_rx_fifo_sz, round_tx_fifo_sz, sm_index;
+  segment_manager_properties_t *props, *cprops;
+  int rv, has_transport, seg_index;
+  svm_fifo_segment_private_t *seg;
+  application_t *server, *client;
+  segment_manager_t *sm;
+  local_session_t *ls;
+  svm_msg_q_t *sq, *cq;
+  u64 segment_handle;
+
+  ls = application_local_session_alloc (server_wrk);
+  server = application_get (server_wrk->app_index);
+  client = application_get (client_wrk->app_index);
+
+  props = application_segment_manager_properties (server);
+  cprops = application_segment_manager_properties (client);
+  evt_q_elts = props->evt_q_size + cprops->evt_q_size;
+  evt_q_sz = segment_manager_evt_q_expected_size (evt_q_elts);
+  round_rx_fifo_sz = 1 << max_log2 (props->rx_fifo_size);
+  round_tx_fifo_sz = 1 << max_log2 (props->tx_fifo_size);
+  seg_size = round_rx_fifo_sz + round_tx_fifo_sz + evt_q_sz + margin;
+
+  has_transport = session_has_transport ((stream_session_t *) ll);
+  if (!has_transport)
+    {
+      /* Local sessions don't have backing transport */
+      ls->port = ll->port;
+      sm = application_get_local_segment_manager (server_wrk);
+    }
+  else
+    {
+      stream_session_t *sl = (stream_session_t *) ll;
+      transport_connection_t *tc;
+      tc = listen_session_get_transport (sl);
+      ls->port = tc->lcl_port;
+      sm = app_worker_get_listen_segment_manager (server_wrk, sl);
+    }
+
+  seg_index = segment_manager_add_segment (sm, seg_size);
+  if (seg_index < 0)
+    {
+      clib_warning ("failed to add new cut-through segment");
+      return seg_index;
+    }
+  seg = segment_manager_get_segment_w_lock (sm, seg_index);
+  sq = segment_manager_alloc_queue (seg, props);
+  cq = segment_manager_alloc_queue (seg, cprops);
+
+  if (props->use_mq_eventfd)
+    application_local_session_fix_eventds (sq, cq);
+
+  ls->server_evt_q = pointer_to_uword (sq);
+  ls->client_evt_q = pointer_to_uword (cq);
+  rv = segment_manager_try_alloc_fifos (seg, props->rx_fifo_size,
+                                       props->tx_fifo_size,
+                                       &ls->server_rx_fifo,
+                                       &ls->server_tx_fifo);
+  if (rv)
+    {
+      clib_warning ("failed to add fifos in cut-through segment");
+      segment_manager_segment_reader_unlock (sm);
+      goto failed;
+    }
+  sm_index = segment_manager_index (sm);
+  ls->server_rx_fifo->ct_session_index = ls->session_index;
+  ls->server_tx_fifo->ct_session_index = ls->session_index;
+  ls->server_rx_fifo->segment_manager = sm_index;
+  ls->server_tx_fifo->segment_manager = sm_index;
+  ls->server_rx_fifo->segment_index = seg_index;
+  ls->server_tx_fifo->segment_index = seg_index;
+  ls->svm_segment_index = seg_index;
+  ls->listener_index = ll->session_index;
+  ls->client_wrk_index = client_wrk->wrk_index;
+  ls->client_opaque = opaque;
+  ls->listener_session_type = ll->session_type;
+  ls->session_state = SESSION_STATE_READY;
+
+  segment_handle = segment_manager_segment_handle (sm, seg);
+  if ((rv = server->cb_fns.add_segment_callback (server_wrk->api_client_index,
+                                                segment_handle)))
+    {
+      clib_warning ("failed to notify server of new segment");
+      segment_manager_segment_reader_unlock (sm);
+      goto failed;
+    }
+  segment_manager_segment_reader_unlock (sm);
+  if ((rv = server->cb_fns.session_accept_callback ((stream_session_t *) ls)))
+    {
+      clib_warning ("failed to send accept cut-through notify to server");
+      goto failed;
+    }
+  if (server->flags & APP_OPTIONS_FLAGS_IS_BUILTIN)
+    application_local_session_connect_notify (ls);
+
+  return 0;
+
+failed:
+  if (!has_transport)
+    segment_manager_del_segment (sm, seg);
+  return rv;
+}
+
+static uword
+application_client_local_connect_key (local_session_t * ls)
+{
+  return ((uword) ls->app_wrk_index << 32 | (uword) ls->session_index);
+}
+
+static void
+application_client_local_connect_key_parse (uword key, u32 * app_wrk_index,
+                                           u32 * session_index)
+{
+  *app_wrk_index = key >> 32;
+  *session_index = key & 0xFFFFFFFF;
+}
+
+int
+application_local_session_connect_notify (local_session_t * ls)
+{
+  svm_fifo_segment_private_t *seg;
+  app_worker_t *client_wrk, *server_wrk;
+  segment_manager_t *sm;
+  application_t *client;
+  int rv, is_fail = 0;
+  u64 segment_handle;
+  uword client_key;
+
+  client_wrk = app_worker_get (ls->client_wrk_index);
+  server_wrk = app_worker_get (ls->app_wrk_index);
+  client = application_get (client_wrk->app_index);
+
+  sm = application_get_local_segment_manager_w_session (server_wrk, ls);
+  seg = segment_manager_get_segment_w_lock (sm, ls->svm_segment_index);
+  segment_handle = segment_manager_segment_handle (sm, seg);
+  if ((rv = client->cb_fns.add_segment_callback (client_wrk->api_client_index,
+                                                segment_handle)))
+    {
+      clib_warning ("failed to notify client %u of new segment",
+                   ls->client_wrk_index);
+      segment_manager_segment_reader_unlock (sm);
+      application_local_session_disconnect (ls->client_wrk_index, ls);
+      is_fail = 1;
+    }
+  else
+    {
+      segment_manager_segment_reader_unlock (sm);
+    }
 
-  /* Add to app's listener table. Useful to find all child listeners
-   * when app goes down, although, just for unbinding this is not needed */
-  handle = listen_session_get_handle (s);
-  hash_set (srv->listeners_table, handle, segment_manager_index (sm));
+  client->cb_fns.session_connected_callback (client_wrk->wrk_index,
+                                            ls->client_opaque,
+                                            (stream_session_t *) ls,
+                                            is_fail);
 
-  *res = handle;
+  client_key = application_client_local_connect_key (ls);
+  hash_set (client_wrk->local_connects, client_key, client_key);
   return 0;
-
-err:
-  listen_session_del (s);
-  return -1;
 }
 
-/**
- * Stop listening on session associated to handle
- */
 int
-application_stop_listen (application_t * srv, u64 handle)
+application_local_session_cleanup (app_worker_t * client_wrk,
+                                  app_worker_t * server_wrk,
+                                  local_session_t * ls)
 {
+  svm_fifo_segment_private_t *seg;
   stream_session_t *listener;
-  uword *indexp;
   segment_manager_t *sm;
-
-  if (srv && hash_get (srv->listeners_table, handle) == 0)
+  uword client_key;
+  u8 has_transport;
+
+  /* Retrieve listener transport type as it is the one that decides where
+   * the fifos are allocated */
+  has_transport = application_local_session_listener_has_transport (ls);
+  if (!has_transport)
+    sm = application_get_local_segment_manager_w_session (server_wrk, ls);
+  else
     {
-      clib_warning ("app doesn't own handle %llu!", handle);
-      return -1;
+      listener = listen_session_get (ls->listener_index);
+      sm = app_worker_get_listen_segment_manager (server_wrk, listener);
     }
 
-  listener = listen_session_get_from_handle (handle);
-  stream_session_stop_listen (listener);
+  seg = segment_manager_get_segment (sm, ls->svm_segment_index);
+  if (client_wrk)
+    {
+      client_key = application_client_local_connect_key (ls);
+      hash_unset (client_wrk->local_connects, client_key);
+    }
 
-  indexp = hash_get (srv->listeners_table, handle);
-  ASSERT (indexp);
+  if (!has_transport)
+    {
+      application_t *server = application_get (server_wrk->app_index);
+      u64 segment_handle = segment_manager_segment_handle (sm, seg);
+      server->cb_fns.del_segment_callback (server_wrk->api_client_index,
+                                          segment_handle);
+      if (client_wrk)
+       {
+         application_t *client = application_get (client_wrk->app_index);
+         client->cb_fns.del_segment_callback (client_wrk->api_client_index,
+                                              segment_handle);
+       }
+      segment_manager_del_segment (sm, seg);
+    }
 
-  sm = segment_manager_get (*indexp);
-  segment_manager_del (sm);
-  srv->first_segment_manager = ~0;
-  hash_unset (srv->listeners_table, handle);
-  listen_session_del (listener);
+  application_local_session_free (server_wrk, ls);
 
   return 0;
 }
 
 int
-application_open_session (application_t * app, session_type_t sst,
-                         transport_endpoint_t * tep, u32 api_context)
+application_local_session_disconnect (u32 app_index, local_session_t * ls)
 {
-  segment_manager_t *sm;
-  transport_connection_t *tc = 0;
-  int rv;
+  app_worker_t *client_wrk, *server_wrk;
+  u8 is_server = 0, is_client = 0;
+  application_t *app;
 
-  /* Make sure we have a segment manager for connects */
-  if (app->connects_seg_manager == (u32) ~ 0)
+  app = application_get_if_valid (app_index);
+  if (!app)
+    return 0;
+
+  client_wrk = app_worker_get_if_valid (ls->client_wrk_index);
+  server_wrk = app_worker_get (ls->app_wrk_index);
+
+  if (server_wrk->app_index == app_index)
+    is_server = 1;
+  else if (client_wrk && client_wrk->app_index == app_index)
+    is_client = 1;
+
+  if (!is_server && !is_client)
     {
-      sm = application_alloc_segment_manager (app);
-      if (sm == 0)
-       return -1;
-      app->connects_seg_manager = segment_manager_index (sm);
+      clib_warning ("app %u is neither client nor server for session 0x%lx",
+                   app_index, application_local_session_handle (ls));
+      return VNET_API_ERROR_INVALID_VALUE;
     }
 
-  if ((rv = stream_session_open (app->index, sst, tep, &tc)))
-    return rv;
+  if (ls->session_state == SESSION_STATE_CLOSED)
+    return application_local_session_cleanup (client_wrk, server_wrk, ls);
+
+  if (app_index == ls->client_wrk_index)
+    {
+      mq_send_local_session_disconnected_cb (ls->app_wrk_index, ls);
+    }
+  else
+    {
+      if (!client_wrk)
+       {
+         return application_local_session_cleanup (client_wrk, server_wrk,
+                                                   ls);
+       }
+      else if (ls->session_state < SESSION_STATE_READY)
+       {
+         application_t *client = application_get (client_wrk->app_index);
+         client->cb_fns.session_connected_callback (client_wrk->wrk_index,
+                                                    ls->client_opaque,
+                                                    (stream_session_t *) ls,
+                                                    1 /* is_fail */ );
+         ls->session_state = SESSION_STATE_CLOSED;
+         return application_local_session_cleanup (client_wrk, server_wrk,
+                                                   ls);
+       }
+      else
+       {
+         mq_send_local_session_disconnected_cb (client_wrk->wrk_index, ls);
+       }
+    }
 
-  /* Store api_context for when the reply comes. Not the nicest thing
-   * but better than allocating a separate half-open pool. */
-  tc->s_index = api_context;
+  ls->session_state = SESSION_STATE_CLOSED;
 
   return 0;
 }
 
-segment_manager_t *
-application_get_connect_segment_manager (application_t * app)
+int
+application_local_session_disconnect_w_index (u32 app_wrk_index, u32 ls_index)
 {
-  ASSERT (app->connects_seg_manager != (u32) ~ 0);
-  return segment_manager_get (app->connects_seg_manager);
+  app_worker_t *app_wrk;
+  local_session_t *ls;
+  app_wrk = app_worker_get (app_wrk_index);
+  ls = application_get_local_session (app_wrk, ls_index);
+  return application_local_session_disconnect (app_wrk_index, ls);
 }
 
-segment_manager_t *
-application_get_listen_segment_manager (application_t * app,
-                                       stream_session_t * s)
+void
+app_worker_local_sessions_free (app_worker_t * app_wrk)
 {
-  uword *smp;
-  smp = hash_get (app->listeners_table, listen_session_get_handle (s));
-  ASSERT (smp != 0);
-  return segment_manager_get (*smp);
-}
+  u32 index, server_wrk_index, session_index;
+  u64 handle, *handles = 0;
+  app_worker_t *server_wrk;
+  segment_manager_t *sm;
+  local_session_t *ls;
+  int i;
 
-static u8 *
-app_get_name_from_reg_index (application_t * app)
-{
-  u8 *app_name;
+  /*
+   * Local sessions
+   */
+  if (app_wrk->local_sessions)
+    {
+      /* *INDENT-OFF* */
+      pool_foreach (ls, app_wrk->local_sessions, ({
+       application_local_session_disconnect (app_wrk->wrk_index, ls);
+      }));
+      /* *INDENT-ON* */
+    }
 
-  vl_api_registration_t *regp;
-  regp = vl_api_client_index_to_registration (app->api_client_index);
-  if (!regp)
-    app_name = format (0, "builtin-%d%c", app->index, 0);
-  else
-    app_name = format (0, "%s%c", regp->name, 0);
+  /*
+   * Local connects
+   */
+  vec_reset_length (handles);
+  /* *INDENT-OFF* */
+  hash_foreach (handle, index, app_wrk->local_connects, ({
+    vec_add1 (handles, handle);
+  }));
+  /* *INDENT-ON* */
+
+  for (i = 0; i < vec_len (handles); i++)
+    {
+      application_client_local_connect_key_parse (handles[i],
+                                                 &server_wrk_index,
+                                                 &session_index);
+      server_wrk = app_worker_get_if_valid (server_wrk_index);
+      if (server_wrk)
+       {
+         ls = application_get_local_session (server_wrk, session_index);
+         application_local_session_disconnect (app_wrk->wrk_index, ls);
+       }
+    }
 
-  return app_name;
+  sm = segment_manager_get (app_wrk->local_segment_manager);
+  sm->app_wrk_index = SEGMENT_MANAGER_INVALID_APP_INDEX;
+  segment_manager_del (sm);
 }
 
-int
-application_is_proxy (application_t * app)
+clib_error_t *
+vnet_app_add_tls_cert (vnet_app_add_tls_cert_args_t * a)
+{
+  application_t *app;
+  app = application_get (a->app_index);
+  if (!app)
+    return clib_error_return_code (0, VNET_API_ERROR_APPLICATION_NOT_ATTACHED,
+                                  0, "app %u doesn't exist", a->app_index);
+  app->tls_cert = vec_dup (a->cert);
+  return 0;
+}
+
+clib_error_t *
+vnet_app_add_tls_key (vnet_app_add_tls_key_args_t * a)
 {
-  return !(app->flags & APP_OPTIONS_FLAGS_IS_PROXY);
+  application_t *app;
+  app = application_get (a->app_index);
+  if (!app)
+    return clib_error_return_code (0, VNET_API_ERROR_APPLICATION_NOT_ATTACHED,
+                                  0, "app %u doesn't exist", a->app_index);
+  app->tls_key = vec_dup (a->key);
+  return 0;
 }
 
 u8 *
-format_application_listener (u8 * s, va_list * args)
+format_app_worker_listener (u8 * s, va_list * args)
 {
-  application_t *app = va_arg (*args, application_t *);
+  app_worker_t *app_wrk = va_arg (*args, app_worker_t *);
   u64 handle = va_arg (*args, u64);
-  u32 index = va_arg (*args, u32);
+  u32 sm_index = va_arg (*args, u32);
   int verbose = va_arg (*args, int);
   stream_session_t *listener;
-  u8 *app_name, *str;
+  const u8 *app_name;
+  u8 *str;
 
-  if (app == 0)
+  if (!app_wrk)
     {
       if (verbose)
-       s = format (s, "%-40s%-20s%-15s%-15s%-10s", "Connection", "App",
-                   "API Client", "ListenerID", "SegManager");
+       s = format (s, "%-40s%-25s%=10s%-15s%-15s%-10s", "Connection", "App",
+                   "Wrk", "API Client", "ListenerID", "SegManager");
       else
-       s = format (s, "%-40s%-20s", "Connection", "App");
+       s = format (s, "%-40s%-25s%=10s", "Connection", "App", "Wrk");
 
       return s;
     }
 
-  app_name = app_get_name_from_reg_index (app);
+  app_name = application_name_from_index (app_wrk->app_index);
   listener = listen_session_get_from_handle (handle);
   str = format (0, "%U", format_stream_session, listener, verbose);
 
   if (verbose)
     {
-      s = format (s, "%-40s%-20s%-15u%-15u%-10u", str, app_name,
-                 app->api_client_index, handle, index);
+      char buf[32];
+      sprintf (buf, "%u(%u)", app_wrk->wrk_map_index, app_wrk->wrk_index);
+      s = format (s, "%-40s%-25s%=10s%-15u%-15u%-10u", str, app_name,
+                 buf, app_wrk->api_client_index, handle, sm_index);
     }
   else
-    s = format (s, "%-40s%-20s", str, app_name);
+    s = format (s, "%-40s%-25s%=10u", str, app_name, app_wrk->wrk_map_index);
 
-  vec_free (app_name);
   return s;
 }
 
-void
-application_format_connects (application_t * app, int verbose)
+static void
+application_format_listeners (application_t * app, int verbose)
+{
+  vlib_main_t *vm = vlib_get_main ();
+  app_worker_map_t *wrk_map;
+  app_worker_t *app_wrk;
+  u32 sm_index;
+  u64 handle;
+
+  if (!app)
+    {
+      vlib_cli_output (vm, "%U", format_app_worker_listener, 0 /* header */ ,
+                      0, 0, verbose);
+      return;
+    }
+
+  /* *INDENT-OFF* */
+  pool_foreach (wrk_map, app->worker_maps, ({
+    app_wrk = app_worker_get (wrk_map->wrk_index);
+    if (hash_elts (app_wrk->listeners_table) == 0)
+      continue;
+    hash_foreach (handle, sm_index, app_wrk->listeners_table, ({
+      vlib_cli_output (vm, "%U", format_app_worker_listener, app_wrk,
+                       handle, sm_index, verbose);
+    }));
+  }));
+  /* *INDENT-ON* */
+}
+
+static void
+app_worker_format_connects (app_worker_t * app_wrk, int verbose)
 {
+  svm_fifo_segment_private_t *fifo_segment;
   vlib_main_t *vm = vlib_get_main ();
   segment_manager_t *sm;
-  u8 *app_name, *s = 0;
-  int j;
+  const u8 *app_name;
+  u8 *s = 0;
 
   /* Header */
-  if (app == 0)
+  if (!app_wrk)
     {
       if (verbose)
        vlib_cli_output (vm, "%-40s%-20s%-15s%-10s", "Connection", "App",
@@ -429,49 +2032,212 @@ application_format_connects (application_t * app, int verbose)
       return;
     }
 
-  /* make sure */
-  if (app->connects_seg_manager == (u32) ~ 0)
+  if (app_wrk->connects_seg_manager == (u32) ~ 0)
     return;
 
-  app_name = app_get_name_from_reg_index (app);
+  app_name = application_name_from_index (app_wrk->app_index);
 
   /* Across all fifo segments */
-  sm = segment_manager_get (app->connects_seg_manager);
-  for (j = 0; j < vec_len (sm->segment_indices); j++)
+  sm = segment_manager_get (app_wrk->connects_seg_manager);
+
+  /* *INDENT-OFF* */
+  segment_manager_foreach_segment_w_lock (fifo_segment, sm, ({
+    svm_fifo_t *fifo;
+    u8 *str;
+
+    fifo = svm_fifo_segment_get_fifo_list (fifo_segment);
+    while (fifo)
+      {
+        u32 session_index, thread_index;
+        stream_session_t *session;
+
+        session_index = fifo->master_session_index;
+        thread_index = fifo->master_thread_index;
+
+        session = session_get (session_index, thread_index);
+        str = format (0, "%U", format_stream_session, session, verbose);
+
+        if (verbose)
+          s = format (s, "%-40s%-20s%-15u%-10u", str, app_name,
+                      app_wrk->api_client_index, app_wrk->connects_seg_manager);
+        else
+          s = format (s, "%-40s%-20s", str, app_name);
+
+        vlib_cli_output (vm, "%v", s);
+        vec_reset_length (s);
+        vec_free (str);
+
+        fifo = fifo->next;
+      }
+    vec_free (s);
+  }));
+  /* *INDENT-ON* */
+
+}
+
+static void
+application_format_connects (application_t * app, int verbose)
+{
+  app_worker_map_t *wrk_map;
+  app_worker_t *app_wrk;
+
+  if (!app)
     {
-      svm_fifo_segment_private_t *fifo_segment;
-      svm_fifo_t *fifo;
-      u8 *str;
+      app_worker_format_connects (0, verbose);
+      return;
+    }
 
-      fifo_segment = svm_fifo_get_segment (sm->segment_indices[j]);
-      fifo = svm_fifo_segment_get_fifo_list (fifo_segment);
-      while (fifo)
-       {
-         u32 session_index, thread_index;
-         stream_session_t *session;
+  /* *INDENT-OFF* */
+  pool_foreach (wrk_map, app->worker_maps, ({
+    app_wrk = app_worker_get (wrk_map->wrk_index);
+    app_worker_format_connects (app_wrk, verbose);
+  }));
+  /* *INDENT-ON* */
+}
 
-         session_index = fifo->master_session_index;
-         thread_index = fifo->master_thread_index;
+static void
+app_worker_format_local_sessions (app_worker_t * app_wrk, int verbose)
+{
+  vlib_main_t *vm = vlib_get_main ();
+  local_session_t *ls;
+  transport_proto_t tp;
+  u8 *conn = 0;
+
+  /* Header */
+  if (app_wrk == 0)
+    {
+      vlib_cli_output (vm, "%-40s%-15s%-20s", "Connection", "ServerApp",
+                      "ClientApp");
+      return;
+    }
 
-         session = stream_session_get (session_index, thread_index);
-         str = format (0, "%U", format_stream_session, session, verbose);
+  if (!pool_elts (app_wrk->local_sessions)
+      && !pool_elts (app_wrk->local_connects))
+    return;
 
-         if (verbose)
-           s = format (s, "%-40s%-20s%-15u%-10u", str, app_name,
-                       app->api_client_index, app->connects_seg_manager);
-         else
-           s = format (s, "%-40s%-20s", str, app_name);
+  /* *INDENT-OFF* */
+  pool_foreach (ls, app_wrk->local_sessions, ({
+    tp = session_type_transport_proto(ls->listener_session_type);
+    conn = format (0, "[L][%U] *:%u", format_transport_proto_short, tp,
+                   ls->port);
+    vlib_cli_output (vm, "%-40v%-15u%-20u", conn, ls->app_wrk_index,
+                     ls->client_wrk_index);
+    vec_reset_length (conn);
+  }));
+  /* *INDENT-ON* */
 
-         vlib_cli_output (vm, "%v", s);
-         vec_reset_length (s);
-         vec_free (str);
+  vec_free (conn);
+}
 
-         fifo = fifo->next;
-       }
-      vec_free (s);
+static void
+application_format_local_sessions (application_t * app, int verbose)
+{
+  vlib_main_t *vm = vlib_get_main ();
+  app_worker_map_t *wrk_map;
+  app_worker_t *app_wrk;
+  transport_proto_t tp;
+  local_session_t *ls;
+  u8 *conn = 0;
+
+  if (!app)
+    {
+      app_worker_format_local_sessions (0, verbose);
+      return;
+    }
+
+  /*
+   * Format local listeners
+   */
+
+  /* *INDENT-OFF* */
+  pool_foreach (ls, app->local_listen_sessions, ({
+    tp = session_type_transport_proto (ls->listener_session_type);
+    conn = format (0, "[L][%U] *:%u", format_transport_proto_short, tp,
+                   ls->port);
+    vlib_cli_output (vm, "%-40v%-15u%-20s", conn, ls->app_wrk_index, "*");
+    vec_reset_length (conn);
+  }));
+  /* *INDENT-ON* */
+
+  /*
+   * Format local accepted/connected sessions
+   */
+  /* *INDENT-OFF* */
+  pool_foreach (wrk_map, app->worker_maps, ({
+    app_wrk = app_worker_get (wrk_map->wrk_index);
+    app_worker_format_local_sessions (app_wrk, verbose);
+  }));
+  /* *INDENT-ON* */
+}
+
+static void
+app_worker_format_local_connects (app_worker_t * app, int verbose)
+{
+  vlib_main_t *vm = vlib_get_main ();
+  u32 app_wrk_index, session_index;
+  app_worker_t *server_wrk;
+  local_session_t *ls;
+  uword client_key;
+  u64 value;
+
+  /* Header */
+  if (app == 0)
+    {
+      if (verbose)
+       vlib_cli_output (vm, "%-40s%-15s%-20s%-10s", "Connection", "App",
+                        "Peer App", "SegManager");
+      else
+       vlib_cli_output (vm, "%-40s%-15s%-20s", "Connection", "App",
+                        "Peer App");
+      return;
+    }
+
+  if (!app->local_connects)
+    return;
+
+  /* *INDENT-OFF* */
+  hash_foreach (client_key, value, app->local_connects, ({
+    application_client_local_connect_key_parse (client_key, &app_wrk_index,
+                                                &session_index);
+    server_wrk = app_worker_get (app_wrk_index);
+    ls = application_get_local_session (server_wrk, session_index);
+    vlib_cli_output (vm, "%-40s%-15s%-20s", "TODO", ls->app_wrk_index,
+                     ls->client_wrk_index);
+  }));
+  /* *INDENT-ON* */
+}
+
+static void
+application_format_local_connects (application_t * app, int verbose)
+{
+  app_worker_map_t *wrk_map;
+  app_worker_t *app_wrk;
+
+  if (!app)
+    {
+      app_worker_format_local_connects (0, verbose);
+      return;
     }
 
-  vec_free (app_name);
+  /* *INDENT-OFF* */
+  pool_foreach (wrk_map, app->worker_maps, ({
+    app_wrk = app_worker_get (wrk_map->wrk_index);
+    app_worker_format_local_connects (app_wrk, verbose);
+  }));
+  /* *INDENT-ON* */
+}
+
+u8 *
+format_application_worker (u8 * s, va_list * args)
+{
+  app_worker_t *app_wrk = va_arg (*args, app_worker_t *);
+  u32 indent = 1;
+
+  s = format (s, "%U wrk-index %u app-index %u map-index %u "
+             "api-client-index %d\n", format_white_space, indent,
+             app_wrk->wrk_index, app_wrk->app_index, app_wrk->wrk_map_index,
+             app_wrk->api_client_index);
+  return s;
 }
 
 u8 *
@@ -479,44 +2245,120 @@ format_application (u8 * s, va_list * args)
 {
   application_t *app = va_arg (*args, application_t *);
   CLIB_UNUSED (int verbose) = va_arg (*args, int);
-  u8 *app_name;
+  segment_manager_properties_t *props;
+  const u8 *app_ns_name, *app_name;
+  app_worker_map_t *wrk_map;
+  app_worker_t *app_wrk;
 
   if (app == 0)
     {
-      if (verbose)
-       s = format (s, "%-10s%-20s%-15s%-15s%-15s%-15s", "Index", "Name",
-                   "API Client", "Add seg size", "Rx fifo size",
-                   "Tx fifo size");
-      else
-       s = format (s, "%-10s%-20s%-20s", "Index", "Name", "API Client");
+      if (!verbose)
+       s = format (s, "%-10s%-20s%-40s", "Index", "Name", "Namespace");
       return s;
     }
 
-  app_name = app_get_name_from_reg_index (app);
-  if (verbose)
-    s = format (s, "%-10d%-20s%-15d%-15d%-15d%-15d", app->index, app_name,
-               app->api_client_index, app->sm_properties.add_segment_size,
-               app->sm_properties.rx_fifo_size,
-               app->sm_properties.tx_fifo_size);
-  else
-    s = format (s, "%-10d%-20s%-20d", app->index, app_name,
-               app->api_client_index);
+  app_name = app_get_name (app);
+  app_ns_name = app_namespace_id_from_index (app->ns_index);
+  props = application_segment_manager_properties (app);
+  if (!verbose)
+    {
+      s = format (s, "%-10u%-20s%-40s", app->app_index, app_name,
+                 app_ns_name);
+      return s;
+    }
+
+  s = format (s, "app-name %s app-index %u ns-index %u seg-size %U\n",
+             app_name, app->app_index, app->ns_index,
+             format_memory_size, props->add_segment_size);
+  s = format (s, "rx-fifo-size %U tx-fifo-size %U workers:\n",
+             format_memory_size, props->rx_fifo_size,
+             format_memory_size, props->tx_fifo_size);
+
+  /* *INDENT-OFF* */
+  pool_foreach (wrk_map, app->worker_maps, ({
+      app_wrk = app_worker_get (wrk_map->wrk_index);
+      s = format (s, "%U", format_application_worker, app_wrk);
+  }));
+  /* *INDENT-ON* */
+
   return s;
 }
 
+void
+application_format_all_listeners (vlib_main_t * vm, int do_local, int verbose)
+{
+  application_t *app;
+
+  if (!pool_elts (app_main.app_pool))
+    {
+      vlib_cli_output (vm, "No active server bindings");
+      return;
+    }
+
+  if (do_local)
+    {
+      application_format_local_sessions (0, verbose);
+      /* *INDENT-OFF* */
+      pool_foreach (app, app_main.app_pool, ({
+        application_format_local_sessions (app, verbose);
+      }));
+      /* *INDENT-ON* */
+    }
+  else
+    {
+      application_format_listeners (0, verbose);
+
+      /* *INDENT-OFF* */
+      pool_foreach (app, app_main.app_pool, ({
+        application_format_listeners (app, verbose);
+      }));
+      /* *INDENT-ON* */
+    }
+}
+
+void
+application_format_all_clients (vlib_main_t * vm, int do_local, int verbose)
+{
+  application_t *app;
+
+  if (!pool_elts (app_main.app_pool))
+    {
+      vlib_cli_output (vm, "No active apps");
+      return;
+    }
+
+  if (do_local)
+    {
+      application_format_local_connects (0, verbose);
+
+      /* *INDENT-OFF* */
+      pool_foreach (app, app_main.app_pool, ({
+       application_format_local_connects (app, verbose);
+      }));
+      /* *INDENT-ON* */
+    }
+  else
+    {
+      application_format_connects (0, verbose);
+
+      /* *INDENT-OFF* */
+      pool_foreach (app, app_main.app_pool, ({
+        application_format_connects (app, verbose);
+      }));
+      /* *INDENT-ON* */
+    }
+}
+
 static clib_error_t *
 show_app_command_fn (vlib_main_t * vm, unformat_input_t * input,
                     vlib_cli_command_t * cmd)
 {
+  int do_server = 0, do_client = 0, do_local = 0;
   application_t *app;
-  int do_server = 0;
-  int do_client = 0;
+  u32 app_index = ~0;
   int verbose = 0;
 
-  if (!session_manager_is_enabled ())
-    {
-      clib_error_return (0, "session layer is not enabled");
-    }
+  session_cli_return_if_not_enabled ();
 
   while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
     {
@@ -524,69 +2366,48 @@ show_app_command_fn (vlib_main_t * vm, unformat_input_t * input,
        do_server = 1;
       else if (unformat (input, "client"))
        do_client = 1;
+      else if (unformat (input, "local"))
+       do_local = 1;
+      else if (unformat (input, "%u", &app_index))
+       ;
       else if (unformat (input, "verbose"))
        verbose = 1;
       else
-       break;
+       return clib_error_return (0, "unknown input `%U'",
+                                 format_unformat_error, input);
     }
 
   if (do_server)
     {
-      u64 handle;
-      u32 index;
-      if (pool_elts (app_pool))
-       {
-         vlib_cli_output (vm, "%U", format_application_listener,
-                          0 /* header */ , 0, 0,
-                          verbose);
-          /* *INDENT-OFF* */
-          pool_foreach (app, app_pool,
-          ({
-            /* App's listener sessions */
-            if (hash_elts (app->listeners_table) == 0)
-              continue;
-            hash_foreach (handle, index, app->listeners_table,
-           ({
-              vlib_cli_output (vm, "%U", format_application_listener, app,
-                                      handle, index, verbose);
-            }));
-          }));
-          /* *INDENT-ON* */
-       }
-      else
-       vlib_cli_output (vm, "No active server bindings");
+      application_format_all_listeners (vm, do_local, verbose);
+      return 0;
     }
 
   if (do_client)
     {
-      if (pool_elts (app_pool))
-       {
-         application_format_connects (0, verbose);
-
-          /* *INDENT-OFF* */
-          pool_foreach (app, app_pool,
-          ({
-            if (app->connects_seg_manager == (u32)~0)
-              continue;
-            application_format_connects (app, verbose);
-          }));
-          /* *INDENT-ON* */
-       }
-      else
-       vlib_cli_output (vm, "No active client bindings");
+      application_format_all_clients (vm, do_local, verbose);
+      return 0;
+    }
+
+  if (app_index != ~0)
+    {
+      app = application_get_if_valid (app_index);
+      if (!app)
+       return clib_error_return (0, "No app with index %u", app_index);
+
+      vlib_cli_output (vm, "%U", format_application, app, /* verbose */ 1);
+      return 0;
     }
 
   /* Print app related info */
   if (!do_server && !do_client)
     {
-      vlib_cli_output (vm, "%U", format_application, 0, verbose);
-      pool_foreach (app, app_pool, (
-                                    {
-                                    vlib_cli_output (vm, "%U",
-                                                     format_application, app,
-                                                     verbose);
-                                    }
-                   ));
+      vlib_cli_output (vm, "%U", format_application, 0, 0);
+      /* *INDENT-OFF* */
+      pool_foreach (app, app_main.app_pool, ({
+       vlib_cli_output (vm, "%U", format_application, app, 0);
+      }));
+      /* *INDENT-ON* */
     }
 
   return 0;