vcl: wait for segments with segment handle
[vpp.git] / src / vnet / session / application.c
index 1ad94cc..f362896 100644 (file)
 
 static app_main_t app_main;
 
+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;
+}
+
+static app_listener_t *
+app_listener_get (application_t * app, u32 app_listener_index)
+{
+  return pool_elt_at_index (app->listeners, app_listener_index);
+}
+
+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);
-  memset (map, 0, sizeof (*map));
+  clib_memset (map, 0, sizeof (*map));
   return map;
 }
 
@@ -47,26 +97,9 @@ app_worker_map_get (application_t * app, u32 map_index)
   return pool_elt_at_index (app->worker_maps, map_index);
 }
 
-static u8 *
-app_get_name_from_reg_index (application_t * app)
-{
-  u8 *app_name;
-
-  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->app_index, 0);
-  else
-    app_name = format (0, "%s%c", regp->name, 0);
-
-  return app_name;
-}
-
-static u8 *
+static const u8 *
 app_get_name (application_t * app)
 {
-  if (!app->name)
-    return app_get_name_from_reg_index (app);
   return app->name;
 }
 
@@ -95,56 +128,51 @@ application_local_session_table (application_t * app)
   return app_ns->local_table_index;
 }
 
-int
-application_api_queue_is_full (application_t * app)
+static void
+application_local_listener_session_endpoint (local_session_t * ll,
+                                            session_endpoint_t * sep)
 {
-  svm_queue_t *q;
-
-  /* builtin servers are always OK */
-  if (app->api_client_index == ~0)
-    return 0;
-
-  q = vl_api_client_index_to_input_queue (app->api_client_index);
-  if (!q)
-    return 1;
-
-  if (q->cursize == q->maxsize)
-    return 1;
-  return 0;
+  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
- *
- * Since the name is not stored per app, we generate it on the fly. It is
- * the caller's responsibility to free the vector
+ * Returns app name for app-index
  */
-u8 *
+const u8 *
 application_name_from_index (u32 app_index)
 {
   application_t *app = application_get (app_index);
   if (!app)
     return 0;
-  return app_get_name_from_reg_index (app);
+  return app_get_name (app);
+}
+
+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);
 }
 
 static void
-application_table_add (application_t * app)
+application_api_table_del (u32 api_client_index)
 {
-  if (app->api_client_index != APP_INVALID_INDEX)
-    hash_set (app_main.app_by_api_client_index, app->api_client_index,
-             app->app_index);
-  else if (app->name)
-    hash_set_mem (app_main.app_by_name, app->name, app->app_index);
+  hash_unset (app_main.app_by_api_client_index, api_client_index);
 }
 
 static void
-application_table_del (application_t * app)
+application_name_table_add (application_t * app)
 {
-  if (app->api_client_index != APP_INVALID_INDEX)
-    hash_unset (app_main.app_by_api_client_index, app->api_client_index);
-  else if (app->name)
-    hash_unset_mem (app_main.app_by_name, app->name);
+  hash_set_mem (app_main.app_by_name, app->name, app->app_index);
+}
+
+static void
+application_name_table_del (application_t * app)
+{
+  hash_unset_mem (app_main.app_by_name, app->name);
 }
 
 application_t *
@@ -153,7 +181,7 @@ application_lookup (u32 api_client_index)
   uword *p;
   p = hash_get (app_main.app_by_api_client_index, api_client_index);
   if (p)
-    return application_get (p[0]);
+    return application_get_if_valid (p[0]);
 
   return 0;
 }
@@ -174,7 +202,7 @@ application_alloc (void)
 {
   application_t *app;
   pool_get (app_main.app_pool, app);
-  memset (app, 0, sizeof (*app));
+  clib_memset (app, 0, sizeof (*app));
   app->app_index = app - app_main.app_pool;
   return app;
 }
@@ -196,12 +224,6 @@ application_get_if_valid (u32 app_index)
   return pool_elt_at_index (app_main.app_pool, app_index);
 }
 
-u32
-application_index (application_t * app)
-{
-  return app - app_main.app_pool;
-}
-
 static void
 application_verify_cb_fns (session_cb_vft_t * cb_fns)
 {
@@ -281,7 +303,6 @@ application_alloc_and_init (app_init_args_t * a)
   /* Check that the obvious things are properly set up */
   application_verify_cb_fns (a->session_cb_vft);
 
-  app->api_client_index = a->api_client_index;
   app->flags = options[APP_OPTIONS_FLAGS];
   app->cb_fns = *a->session_cb_vft;
   app->ns_index = options[APP_OPTIONS_NAMESPACE];
@@ -315,8 +336,12 @@ application_alloc_and_init (app_init_args_t * a)
   props->segment_type = seg_type;
 
   /* Add app to lookup by api_client_index table */
-  application_table_add (app);
-  a->app_index = application_index (app);
+  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);
@@ -329,6 +354,9 @@ application_free (application_t * app)
 {
   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
@@ -340,6 +368,10 @@ application_free (application_t * app)
   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);
@@ -348,13 +380,76 @@ application_free (application_t * app)
   /* *INDENT-ON* */
   pool_free (app->worker_maps);
 
-  application_table_del (app);
+  /*
+   * 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 remaining state
+   */
+  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))
+    {
+      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)
 {
@@ -371,12 +466,41 @@ 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);
-  memset (app_wrk, 0, sizeof (*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;
@@ -427,7 +551,7 @@ app_worker_free (app_worker_t * app_wrk)
   for (i = 0; i < vec_len (handles); i++)
     {
       a->app_index = app->app_index;
-      a->app_wrk_index = app_wrk->wrk_map_index;
+      a->wrk_map_index = app_wrk->wrk_map_index;
       a->handle = handles[i];
       /* seg manager is removed when unbind completes */
       vnet_unbind (a);
@@ -449,23 +573,22 @@ app_worker_free (app_worker_t * app_wrk)
       && 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))
-       {
-         sm->app_wrk_index = SEGMENT_MANAGER_INVALID_APP_INDEX;
-         segment_manager_del (sm);
-       }
+       segment_manager_del (sm);
     }
 
   /*
    * Local sessions
    */
-  application_local_sessions_free (app_wrk);
+  app_worker_local_sessions_free (app_wrk);
 
   pool_put (app_main.workers, app_wrk);
   if (CLIB_DEBUG)
-    memset (app_wrk, 0xfe, sizeof (*app_wrk));
+    clib_memset (app_wrk, 0xfe, sizeof (*app_wrk));
 }
 
 int
@@ -516,8 +639,18 @@ app_worker_alloc_and_init (application_t * app, app_worker_t ** wrk)
   return 0;
 }
 
+application_t *
+app_worker_get_app (u32 wrk_index)
+{
+  app_worker_t *app_wrk;
+  app_wrk = app_worker_get_if_valid (wrk_index);
+  if (!app_wrk)
+    return 0;
+  return application_get_if_valid (app_wrk->app_index);
+}
+
 static segment_manager_t *
-application_alloc_segment_manager (app_worker_t * app_wrk)
+app_worker_alloc_segment_manager (app_worker_t * app_wrk)
 {
   segment_manager_t *sm = 0;
 
@@ -536,6 +669,59 @@ application_alloc_segment_manager (app_worker_t * app_wrk)
   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.
  *
@@ -544,40 +730,77 @@ application_alloc_segment_manager (app_worker_t * app_wrk)
  * it's own specific listening connection.
  */
 int
-app_worker_start_listen (app_worker_t * app_wrk, session_endpoint_t * sep,
-                        session_handle_t * res)
+application_start_listen (application_t * app,
+                         session_endpoint_cfg_t * sep_ext,
+                         session_handle_t * res)
 {
-  segment_manager_t *sm;
-  stream_session_t *s;
-  session_handle_t handle;
+  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;
 
-  sst = session_type_from_proto_and_ip (sep->transport_proto, sep->is_ip4);
-  s = listen_session_new (0, sst);
-  s->app_wrk_index = app_wrk->wrk_index;
+  /*
+   * 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;
 
-  /* Allocate segment manager. All sessions derived out of a listen session
-   * have fifos allocated by the same segment manager. */
-  if (!(sm = application_alloc_segment_manager (app_wrk)))
-    goto err;
+      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;
 
-  /* 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 (app_wrk->listeners_table, handle, segment_manager_index (sm));
+      if (app_worker_start_listen (app_wrk, ls))
+       return -1;
 
-  if (stream_session_listen (s, sep))
-    {
-      segment_manager_del (sm);
-      hash_unset (app_wrk->listeners_table, handle);
-      goto err;
+      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;
     }
 
-  *res = handle;
+  /*
+   * 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 (s);
+  listen_session_del (ls);
   return -1;
 }
 
@@ -585,48 +808,44 @@ err:
  * Stop listening on session associated to handle
  *
  * @param handle       listener handle
- * @param app_index    index of the app owning the handle. This is used
- *                     only for validating ownership
+ * @param app_index    index of the app owning the handle.
+ * @param app_wrk_index        index of the worker requesting the stop
  */
 int
-app_worker_stop_listen (session_handle_t handle, u32 app_index)
+application_stop_listen (u32 app_index, u32 app_wrk_index,
+                        session_handle_t handle)
 {
+  app_listener_t *app_listener;
   stream_session_t *listener;
-  segment_manager_t *sm;
   app_worker_t *app_wrk;
-  uword *indexp;
+  application_t *app;
 
   listener = listen_session_get_from_handle (handle);
-  app_wrk = app_worker_get (listener->app_wrk_index);
-  if (PREDICT_FALSE (!app_wrk || app_wrk->app_index != app_index))
+  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;
     }
-  if (PREDICT_FALSE (hash_get (app_wrk->listeners_table, handle) == 0))
+
+  app_listener = app_listener_get (app, listener->listener_db_index);
+  if (!clib_bitmap_get (app_listener->workers, app_wrk_index))
     {
-      clib_warning ("listener handle was removed %llu!", handle);
-      return -1;
+      clib_warning ("worker %u not listening on handle %lu", app_wrk_index,
+                   handle);
+      return 0;
     }
 
-  stream_session_stop_listen (listener);
-
-  indexp = hash_get (app_wrk->listeners_table, handle);
-  ASSERT (indexp);
+  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);
 
-  sm = segment_manager_get (*indexp);
-  if (app_wrk->first_segment_manager == *indexp)
+  if (clib_bitmap_is_zero (app_listener->workers))
     {
-      /* Delete sessions but don't remove segment manager */
-      app_wrk->first_segment_manager_in_use = 0;
-      segment_manager_del_sessions (sm);
+      session_stop_listen (listener);
+      app_listener_free (app, app_listener);
+      listen_session_del (listener);
     }
-  else
-    {
-      segment_manager_init_del (sm);
-    }
-  hash_unset (app_wrk->listeners_table, handle);
-  listen_session_del (listener);
 
   return 0;
 }
@@ -653,7 +872,7 @@ app_worker_alloc_connects_segment_manager (app_worker_t * app_wrk)
 
   if (app_wrk->connects_seg_manager == APP_INVALID_SEGMENT_MANAGER_INDEX)
     {
-      sm = application_alloc_segment_manager (app_wrk);
+      sm = app_worker_alloc_segment_manager (app_wrk);
       if (sm == 0)
        return -1;
       app_wrk->connects_seg_manager = segment_manager_index (sm);
@@ -670,10 +889,10 @@ app_worker_get_connect_segment_manager (app_worker_t * app)
 
 segment_manager_t *
 app_worker_get_listen_segment_manager (app_worker_t * app,
-                                      stream_session_t * s)
+                                      stream_session_t * listener)
 {
   uword *smp;
-  smp = hash_get (app->listeners_table, listen_session_get_handle (s));
+  smp = hash_get (app->listeners_table, listen_session_get_handle (listener));
   ASSERT (smp != 0);
   return segment_manager_get (*smp);
 }
@@ -697,25 +916,35 @@ vnet_app_worker_add_del (vnet_app_worker_add_del_args_t * a)
     {
       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_index);
+      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_index);
+                                      app->app_index, a->wrk_map_index);
       app_wrk = app_worker_get (wrk_map->wrk_index);
-      app_worker_map_free (app, wrk_map);
       if (!app_wrk)
        return clib_error_return_code (0, VNET_API_ERROR_INVALID_VALUE, 0,
-                                      "No worker %u", a->wrk_index);
+                                      "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;
 }
@@ -769,15 +998,22 @@ 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, ssvm_private_t * fs)
+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->api_client_index, fs);
+  return app->cb_fns.add_segment_callback (app_wrk->api_client_index,
+                                          segment_handle);
 }
 
 u32
@@ -802,7 +1038,7 @@ app_worker_first_listener (app_worker_t * app, u8 fib_proto,
    hash_foreach (handle, sm_index, app->listeners_table, ({
      listener = listen_session_get_from_handle (handle);
      if (listener->session_type == sst
-        && listener->listener_index != SESSION_PROXY_LISTENER_INDEX)
+        && listener->enqueue_epoch != SESSION_PROXY_LISTENER_INDEX)
        return listener;
    }));
   /* *INDENT-ON* */
@@ -832,7 +1068,7 @@ application_proxy_listener (app_worker_t * app, u8 fib_proto,
    hash_foreach (handle, sm_index, app->listeners_table, ({
      listener = listen_session_get_from_handle (handle);
      if (listener->session_type == sst
-        && listener->listener_index == SESSION_PROXY_LISTENER_INDEX)
+        && listener->enqueue_epoch == SESSION_PROXY_LISTENER_INDEX)
        return listener;
    }));
   /* *INDENT-ON* */
@@ -846,7 +1082,7 @@ application_start_stop_proxy_fib_proto (application_t * app, u8 fib_proto,
 {
   app_namespace_t *app_ns = app_namespace_get (app->ns_index);
   u8 is_ip4 = (fib_proto == FIB_PROTOCOL_IP4);
-  session_endpoint_t sep = SESSION_ENDPOINT_NULL;
+  session_endpoint_cfg_t sep = SESSION_ENDPOINT_CFG_NULL;
   transport_connection_t *tc;
   app_worker_t *app_wrk;
   stream_session_t *s;
@@ -863,9 +1099,10 @@ application_start_stop_proxy_fib_proto (application_t * app, u8 fib_proto,
          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;
-         app_worker_start_listen (app_wrk, &sep, &handle);
+         sep.app_wrk_index = app_wrk->wrk_index;       /* only default */
+         application_start_listen (app, &sep, &handle);
          s = listen_session_get_from_handle (handle);
-         s->listener_index = SESSION_PROXY_LISTENER_INDEX;
+         s->enqueue_epoch = SESSION_PROXY_LISTENER_INDEX;
        }
     }
   else
@@ -885,9 +1122,12 @@ application_start_stop_proxy_fib_proto (application_t * app, u8 fib_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, &sep, s->session_index);
+       session_lookup_add_session_endpoint (sti,
+                                            (session_endpoint_t *) & sep,
+                                            s->session_index);
       else
-       session_lookup_del_session_endpoint (sti, &sep);
+       session_lookup_del_session_endpoint (sti,
+                                            (session_endpoint_t *) & sep);
     }
 
   return 0;
@@ -1053,9 +1293,10 @@ app_send_io_evt_rx (app_worker_t * app_wrk, stream_session_t * s, u8 lock)
   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;
-  (void) svm_fifo_set_event (s->server_rx_fifo);
   return 0;
 }
 
@@ -1105,42 +1346,47 @@ static app_send_evt_handler_fn * const app_send_evt_handler_fns[3] = {
 /**
  * Send event to application
  *
- * Logic from queue perspective is non-blocking. That is, if there's
- * not enough space to enqueue a message, we return. However, if the lock
- * flag is set, we do wait for queue mutex.
+ * Logic from queue perspective is non-blocking. If there's
+ * not enough space to enqueue a message, we return.
  */
 int
-application_send_event (app_worker_t * app, stream_session_t * s, u8 evt_type)
+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
-application_lock_and_send_event (app_worker_t * app, stream_session_t * s,
-                                u8 evt_type)
+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_alloc_local_session (app_worker_t * app)
+application_local_session_alloc (app_worker_t * app_wrk)
 {
   local_session_t *s;
-  pool_get (app->local_sessions, s);
-  memset (s, 0, sizeof (*s));
-  s->app_wrk_index = app->app_index;
-  s->session_index = s - app->local_sessions;
+  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_free_local_session (app_worker_t * app, local_session_t * s)
+application_local_session_free (app_worker_t * app, local_session_t * s)
 {
   pool_put (app->local_sessions, s);
   if (CLIB_DEBUG)
-    memset (s, 0xfc, sizeof (*s));
+    clib_memset (s, 0xfc, sizeof (*s));
 }
 
 local_session_t *
@@ -1163,44 +1409,80 @@ application_get_local_session_from_handle (session_handle_t handle)
   return application_get_local_session (server_wrk, session_index);
 }
 
-always_inline void
-application_local_listener_session_endpoint (local_session_t * ll,
-                                            session_endpoint_t * sep)
+local_session_t *
+application_local_listen_session_alloc (application_t * app)
 {
-  sep->transport_proto =
-    session_type_transport_proto (ll->listener_session_type);
-  sep->port = ll->port;
-  sep->is_ip4 = ll->listener_session_type & 1;
+  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 (app_worker_t * app_wrk,
-                               session_endpoint_t * sep,
+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;
-  application_t *app;
   u32 table_index;
 
-  app = application_get (app_wrk->app_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)
-    return VNET_API_ERROR_ADDRESS_IN_USE;
+    {
+      ll = application_get_local_listener_w_handle (lh);
+      if (ll->app_index != app->app_index)
+       return VNET_API_ERROR_ADDRESS_IN_USE;
 
-  pool_get (app_wrk->local_listen_sessions, ll);
-  memset (ll, 0, sizeof (*ll));
+      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 = ll - app_wrk->local_listen_sessions;
-  ll->port = sep->port;
+  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->transport_proto, sep->is_ip4);
+    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);
@@ -1214,10 +1496,12 @@ application_start_local_listen (app_worker_t * app_wrk,
  * so parse it.
  */
 int
-application_stop_local_listen (session_handle_t lh, u32 app_index)
+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_wrk_index;
+  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;
@@ -1242,28 +1526,44 @@ application_stop_local_listen (session_handle_t lh, u32 app_index)
        return -1;
     }
 
-  local_session_parse_handle (lh, &server_wrk_index, &ll_index);
-  server_wrk = app_worker_get (server_wrk_index);
-  if (PREDICT_FALSE (server_wrk->app_index != app_index))
+  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_wrk, ll_index);
+
+  ll = application_get_local_listen_session (server, ll_index);
   if (PREDICT_FALSE (!ll))
     {
       clib_warning ("no local listener");
       return -1;
     }
-  application_local_listener_session_endpoint (ll, &sep);
-  session_lookup_del_session_endpoint (table_index, &sep);
 
+  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* */
-  pool_put_index (server_wrk->local_listen_sessions, ll->session_index);
+
+  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;
 }
@@ -1291,17 +1591,17 @@ application_local_session_connect (app_worker_t * client_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;
-  u32 round_rx_fifo_sz, round_tx_fifo_sz;
   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_alloc_local_session (server_wrk);
-
+  ls = application_local_session_alloc (server_wrk);
   server = application_get (server_wrk->app_index);
   client = application_get (client_wrk->app_index);
 
@@ -1354,18 +1654,23 @@ application_local_session_connect (app_worker_t * client_wrk,
       segment_manager_segment_reader_unlock (sm);
       goto failed;
     }
-  ls->server_rx_fifo->master_session_index = ls->session_index;
-  ls->server_tx_fifo->master_session_index = ls->session_index;
-  ls->server_rx_fifo->master_thread_index = ~0;
-  ls->server_tx_fifo->master_thread_index = ~0;
+  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;
 
-  if ((rv = server->cb_fns.add_segment_callback (server->api_client_index,
-                                                &seg->ssvm)))
+  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);
@@ -1410,6 +1715,7 @@ application_local_session_connect_notify (local_session_t * ls)
   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);
@@ -1418,8 +1724,9 @@ application_local_session_connect_notify (local_session_t * ls)
 
   sm = application_get_local_segment_manager_w_session (server_wrk, ls);
   seg = segment_manager_get_segment_w_lock (sm, ls->svm_segment_index);
-  if ((rv = client->cb_fns.add_segment_callback (client->api_client_index,
-                                                &seg->ssvm)))
+  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);
@@ -1448,54 +1755,79 @@ application_local_session_cleanup (app_worker_t * client_wrk,
                                   local_session_t * ls)
 {
   svm_fifo_segment_private_t *seg;
+  stream_session_t *listener;
   segment_manager_t *sm;
   uword client_key;
   u8 has_transport;
 
-  has_transport = session_has_transport ((stream_session_t *) ls);
-  client_key = application_client_local_connect_key (ls);
+  /* 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
-    sm = app_worker_get_listen_segment_manager (server_wrk,
-                                               (stream_session_t *) ls);
+    {
+      listener = listen_session_get (ls->listener_index);
+      sm = app_worker_get_listen_segment_manager (server_wrk, listener);
+    }
 
   seg = segment_manager_get_segment (sm, ls->svm_segment_index);
   if (client_wrk)
-    hash_unset (client_wrk->local_connects, client_key);
+    {
+      client_key = application_client_local_connect_key (ls);
+      hash_unset (client_wrk->local_connects, client_key);
+    }
 
   if (!has_transport)
     {
       application_t *server = application_get (server_wrk->app_index);
-      server->cb_fns.del_segment_callback (server->api_client_index,
-                                          &seg->ssvm);
+      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->api_client_index,
-                                              &seg->ssvm);
+         client->cb_fns.del_segment_callback (client_wrk->api_client_index,
+                                              segment_handle);
        }
       segment_manager_del_segment (sm, seg);
     }
 
-  application_free_local_session (server_wrk, ls);
+  application_local_session_free (server_wrk, ls);
 
   return 0;
 }
 
 int
-application_local_session_disconnect (u32 app_wrk_index, local_session_t * ls)
+application_local_session_disconnect (u32 app_index, local_session_t * ls)
 {
   app_worker_t *client_wrk, *server_wrk;
+  u8 is_server = 0, is_client = 0;
+  application_t *app;
+
+  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)
+    {
+      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 (ls->session_state == SESSION_STATE_CLOSED)
     return application_local_session_cleanup (client_wrk, server_wrk, ls);
 
-  if (app_wrk_index == ls->client_wrk_index)
+  if (app_index == ls->client_wrk_index)
     {
       mq_send_local_session_disconnected_cb (ls->app_wrk_index, ls);
     }
@@ -1539,29 +1871,15 @@ application_local_session_disconnect_w_index (u32 app_wrk_index, u32 ls_index)
 }
 
 void
-application_local_sessions_free (app_worker_t * app_wrk)
+app_worker_local_sessions_free (app_worker_t * app_wrk)
 {
-  u32 index, server_wrk_index, session_index, table_index;
-  segment_manager_t *sm;
+  u32 index, server_wrk_index, session_index;
   u64 handle, *handles = 0;
-  local_session_t *ls, *ll;
   app_worker_t *server_wrk;
-  session_endpoint_t sep;
-  application_t *app;
+  segment_manager_t *sm;
+  local_session_t *ls;
   int i;
 
-  /*
-   * Local listens. Don't bother with local sessions, we clean them lower
-   */
-  app = application_get (app_wrk->app_index);
-  table_index = application_local_session_table (app);
-  /* *INDENT-OFF* */
-  pool_foreach (ll, app_wrk->local_listen_sessions, ({
-    application_local_listener_session_endpoint (ll, &sep);
-    session_lookup_del_session_endpoint (table_index, &sep);
-  }));
-  /* *INDENT-ON* */
-
   /*
    * Local sessions
    */
@@ -1634,34 +1952,34 @@ format_app_worker_listener (u8 * s, va_list * args)
   u32 sm_index = va_arg (*args, u32);
   int verbose = va_arg (*args, int);
   stream_session_t *listener;
-  application_t *app;
-  u8 *app_name, *str;
+  const u8 *app_name;
+  u8 *str;
 
   if (!app_wrk)
     {
       if (verbose)
-       s = format (s, "%-40s%-25s%-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%-25s", "Connection", "App");
+       s = format (s, "%-40s%-25s%=10s", "Connection", "App", "Wrk");
 
       return s;
     }
 
-  app = application_get (app_wrk->app_index);
-  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%-25s%-15u%-15u%-10u", str, app_name,
-                 app->api_client_index, handle, sm_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%-25s", str, app_name);
+    s = format (s, "%-40s%-25s%=10u", str, app_name, app_wrk->wrk_map_index);
 
-  vec_free (app_name);
   return s;
 }
 
@@ -1700,8 +2018,8 @@ 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;
-  application_t *app;
+  const u8 *app_name;
+  u8 *s = 0;
 
   /* Header */
   if (!app_wrk)
@@ -1714,11 +2032,10 @@ app_worker_format_connects (app_worker_t * app_wrk, int verbose)
       return;
     }
 
-  app = application_get (app_wrk->app_index);
   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_wrk->connects_seg_manager);
@@ -1730,33 +2047,32 @@ app_worker_format_connects (app_worker_t * app_wrk, int verbose)
 
     fifo = svm_fifo_segment_get_fifo_list (fifo_segment);
     while (fifo)
-       {
-         u32 session_index, thread_index;
-         stream_session_t *session;
+      {
+        u32 session_index, thread_index;
+        stream_session_t *session;
 
-         session_index = fifo->master_session_index;
-         thread_index = fifo->master_thread_index;
+        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);
+        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->api_client_index, app_wrk->connects_seg_manager);
-         else
-           s = format (s, "%-40s%-20s", str, app_name);
+        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);
+        vlib_cli_output (vm, "%v", s);
+        vec_reset_length (s);
+        vec_free (str);
 
-         fifo = fifo->next;
-       }
+        fifo = fifo->next;
+      }
     vec_free (s);
   }));
   /* *INDENT-ON* */
 
-  vec_free (app_name);
 }
 
 static void
@@ -1800,13 +2116,6 @@ app_worker_format_local_sessions (app_worker_t * app_wrk, int verbose)
     return;
 
   /* *INDENT-OFF* */
-  pool_foreach (ls, app_wrk->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);
-  }));
   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,
@@ -1823,8 +2132,12 @@ app_worker_format_local_sessions (app_worker_t * app_wrk, int verbose)
 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)
     {
@@ -1832,6 +2145,23 @@ application_format_local_sessions (application_t * app, int 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);
@@ -1897,39 +2227,60 @@ application_format_local_connects (application_t * app, int 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 *
 format_application (u8 * s, va_list * args)
 {
   application_t *app = va_arg (*args, application_t *);
   CLIB_UNUSED (int verbose) = va_arg (*args, int);
   segment_manager_properties_t *props;
-  const u8 *app_ns_name;
-  u8 *app_name;
+  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%-15s", "Index", "Name",
-                   "API Client", "Namespace", "Add seg size", "Rx-f size",
-                   "Tx-f size");
-      else
-       s = format (s, "%-10s%-20s%-15s%-40s", "Index", "Name", "API Client",
-                   "Namespace");
+      if (!verbose)
+       s = format (s, "%-10s%-20s%-40s", "Index", "Name", "Namespace");
       return s;
     }
 
   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%-15d%-15u%-15U%-15U%-15U", app->app_index,
-               app_name, app->api_client_index, app->ns_index,
-               format_memory_size, props->add_segment_size,
-               format_memory_size, props->rx_fifo_size, format_memory_size,
-               props->tx_fifo_size);
-  else
-    s = format (s, "%-10u%-20s%-15d%-40s", app->app_index, app_name,
-               app->api_client_index, app_ns_name);
+  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;
 }
 
@@ -2004,6 +2355,7 @@ show_app_command_fn (vlib_main_t * vm, unformat_input_t * input,
 {
   int do_server = 0, do_client = 0, do_local = 0;
   application_t *app;
+  u32 app_index = ~0;
   int verbose = 0;
 
   session_cli_return_if_not_enabled ();
@@ -2016,25 +2368,44 @@ show_app_command_fn (vlib_main_t * vm, unformat_input_t * input,
        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)
-    application_format_all_listeners (vm, do_local, verbose);
+    {
+      application_format_all_listeners (vm, do_local, verbose);
+      return 0;
+    }
 
   if (do_client)
-    application_format_all_clients (vm, do_local, verbose);
+    {
+      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);
+      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, verbose);
+       vlib_cli_output (vm, "%U", format_application, app, 0);
       }));
       /* *INDENT-ON* */
     }