session: send ctrl msg over mq

Change-Id: I242056bc46ddb671064665916b2687860292dcb2
Signed-off-by: Florin Coras <fcoras@cisco.com>

8 files changed, 519 insertions, 62 deletions

diff --git a/src/vnet/session/application.c b/src/vnet/session/application.c
index 6041b49712d..1dc04f0afa7 100644
--- a/src/vnet/session/application.c
+++ b/src/vnet/session/application.c
@@ -810,22 +810,7 @@ application_get_segment_manager_properties (u32 app_index)
 static inline int
 app_enqueue_evt (svm_msg_q_t * mq, svm_msg_q_msg_t * msg, u8 lock)
 {
-  if (PREDICT_TRUE (!svm_msg_q_is_full (mq)))
-    {
-      if (lock)
-	{
-	  svm_msg_q_add_w_lock (mq, msg);
-	  svm_msg_q_unlock (mq);
-	}
-      else if (svm_msg_q_add (mq, msg, SVM_Q_WAIT))
-	{
-	  clib_warning ("msg q add returned");
-	  if (lock)
-	    svm_msg_q_unlock (mq);
-	  return -1;
-	}
-    }
-  else
+  if (PREDICT_FALSE (svm_msg_q_is_full (mq)))
     {
       clib_warning ("evt q full");
       svm_msg_q_free_msg (mq, msg);
@@ -833,13 +818,26 @@ app_enqueue_evt (svm_msg_q_t * mq, svm_msg_q_msg_t * msg, u8 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 (application_t * app, stream_session_t * s, u8 lock)
 {
-  session_fifo_event_t *evt;
+  session_event_t *evt;
   svm_msg_q_msg_t msg;
   svm_msg_q_t *mq;
 
@@ -873,7 +871,7 @@ app_send_io_evt_rx (application_t * app, stream_session_t * s, u8 lock)
   msg = svm_msg_q_alloc_msg_w_ring (mq, SESSION_MQ_IO_EVT_RING);
   ASSERT (!svm_msg_q_msg_is_invalid (&msg));
 
-  evt = (session_fifo_event_t *) svm_msg_q_msg_data (mq, &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;
 
@@ -884,7 +882,7 @@ static inline int
 app_send_io_evt_tx (application_t * app, stream_session_t * s, u8 lock)
 {
   svm_msg_q_t *mq;
-  session_fifo_event_t *evt;
+  session_event_t *evt;
   svm_msg_q_msg_t msg;
 
   if (application_is_builtin (app))
@@ -905,7 +903,7 @@ app_send_io_evt_tx (application_t * app, stream_session_t * s, u8 lock)
   msg = svm_msg_q_alloc_msg_w_ring (mq, SESSION_MQ_IO_EVT_RING);
   ASSERT (!svm_msg_q_msg_is_invalid (&msg));
 
-  evt = (session_fifo_event_t *) svm_msg_q_msg_data (mq, &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;
 
diff --git a/src/vnet/session/application_interface.h b/src/vnet/session/application_interface.h
index 50c043493f2..0aabd380f8f 100644
--- a/src/vnet/session/application_interface.h
+++ b/src/vnet/session/application_interface.h
@@ -137,6 +137,7 @@ typedef enum
   _(IS_PROXY, "Application is proxying")			\
   _(USE_GLOBAL_SCOPE, "App can use global session scope")	\
   _(USE_LOCAL_SCOPE, "App can use local session scope")		\
+  _(USE_MQ_FOR_CTRL_MSGS, "Use message queue for ctr msgs")	\
 
 typedef enum _app_options
 {
@@ -197,6 +198,102 @@ typedef struct
 #undef _
 } app_session_t;
 
+typedef struct session_accepted_msg_
+{
+  u32 context;
+  u64 listener_handle;
+  u64 handle;
+  u64 server_rx_fifo;
+  u64 server_tx_fifo;
+  u64 vpp_event_queue_address;
+  u64 server_event_queue_address;
+  u16 port;
+  u8 is_ip4;
+  u8 ip[16];
+} session_accepted_msg_t;
+
+typedef struct session_accepted_reply_msg_
+{
+  u32 context;
+  i32 retval;
+  u64 handle;
+} session_accepted_reply_msg_t;
+
+/* Make sure this is not too large, otherwise it won't fit when dequeued in
+ * the session queue node */
+STATIC_ASSERT (sizeof (session_accepted_reply_msg_t) <= 16, "accept reply");
+
+typedef struct session_connected_msg_
+{
+  u32 context;
+  i32 retval;
+  u64 handle;
+  u64 server_rx_fifo;
+  u64 server_tx_fifo;
+  u64 vpp_event_queue_address;
+  u64 client_event_queue_address;
+  u32 segment_size;
+  u8 segment_name_length;
+  u8 segment_name[64];
+  u8 lcl_ip[16];
+  u8 is_ip4;
+  u16 lcl_port;
+} session_connected_msg_t;
+
+typedef struct session_disconnected_msg_
+{
+  u32 client_index;
+  u32 context;
+  u64 handle;
+} session_disconnected_msg_t;
+
+typedef struct session_disconnected_reply_msg_
+{
+  u32 context;
+  i32 retval;
+  u64 handle;
+} session_disconnected_reply_msg_t;
+
+typedef struct session_reset_msg_
+{
+  u32 client_index;
+  u32 context;
+  u64 handle;
+} session_reset_msg_t;
+
+typedef struct session_reset_reply_msg_
+{
+  u32 client_index;
+  u32 context;
+  i32 retval;
+  u64 handle;
+} session_reset_reply_msg_t;
+
+typedef struct app_session_event_
+{
+  svm_msg_q_msg_t msg;
+  session_event_t *evt;
+} app_session_evt_t;
+
+static inline void
+app_alloc_ctrl_evt_to_vpp (svm_msg_q_t * mq, app_session_evt_t * app_evt,
+			   u8 evt_type)
+{
+  svm_msg_q_lock_and_alloc_msg_w_ring (mq,
+				       SESSION_MQ_CTRL_EVT_RING,
+				       SVM_Q_WAIT, &app_evt->msg);
+  svm_msg_q_unlock (mq);
+  app_evt->evt = svm_msg_q_msg_data (mq, &app_evt->msg);
+  memset (app_evt->evt, 0, sizeof (*app_evt->evt));
+  app_evt->evt->event_type = evt_type;
+}
+
+static inline void
+app_send_ctrl_evt_to_vpp (svm_msg_q_t * mq, app_session_evt_t * app_evt)
+{
+  svm_msg_q_add (mq, &app_evt->msg, SVM_Q_WAIT);
+}
+
 /**
  * Send fifo io event to vpp worker thread
  *
@@ -213,7 +310,7 @@ static inline int
 app_send_io_evt_to_vpp (svm_msg_q_t * mq, svm_fifo_t * f, u8 evt_type,
 			u8 noblock)
 {
-  session_fifo_event_t *evt;
+  session_event_t *evt;
   svm_msg_q_msg_t msg;
 
   if (noblock)
@@ -231,11 +328,10 @@ app_send_io_evt_to_vpp (svm_msg_q_t * mq, svm_fifo_t * f, u8 evt_type,
 	  svm_msg_q_unlock (mq);
 	  return -2;
 	}
-      evt = (session_fifo_event_t *) svm_msg_q_msg_data (mq, &msg);
+      evt = (session_event_t *) svm_msg_q_msg_data (mq, &msg);
       evt->fifo = f;
       evt->event_type = evt_type;
-      svm_msg_q_add_w_lock (mq, &msg);
-      svm_msg_q_unlock (mq);
+      svm_msg_q_add_and_unlock (mq, &msg);
       return 0;
     }
   else
@@ -247,13 +343,12 @@ app_send_io_evt_to_vpp (svm_msg_q_t * mq, svm_fifo_t * f, u8 evt_type,
 	  svm_msg_q_wait (mq);
 	  msg = svm_msg_q_alloc_msg_w_ring (mq, SESSION_MQ_IO_EVT_RING);
 	}
-      evt = (session_fifo_event_t *) svm_msg_q_msg_data (mq, &msg);
+      evt = (session_event_t *) svm_msg_q_msg_data (mq, &msg);
       evt->fifo = f;
       evt->event_type = evt_type;
       if (svm_msg_q_is_full (mq))
 	svm_msg_q_wait (mq);
-      svm_msg_q_add_w_lock (mq, &msg);
-      svm_msg_q_unlock (mq);
+      svm_msg_q_add_and_unlock (mq, &msg);
       return 0;
     }
 }
diff --git a/src/vnet/session/segment_manager.c b/src/vnet/session/segment_manager.c
index b00bcd5bbc8..c7d2482d6bf 100644
--- a/src/vnet/session/segment_manager.c
+++ b/src/vnet/session/segment_manager.c
@@ -605,7 +605,7 @@ segment_manager_evt_q_expected_size (u32 q_len)
   u32 fifo_evt_size, notif_q_size, q_hdrs;
   u32 msg_q_sz, fifo_evt_ring_sz, session_ntf_ring_sz;
 
-  fifo_evt_size = 1 << max_log2 (sizeof (session_fifo_event_t));
+  fifo_evt_size = 1 << max_log2 (sizeof (session_event_t));
   notif_q_size = clib_max (16, q_len >> 4);
 
   msg_q_sz = q_len * sizeof (svm_msg_q_msg_t);
@@ -630,7 +630,7 @@ segment_manager_alloc_queue (svm_fifo_segment_private_t * segment,
   svm_msg_q_t *q;
   void *oldheap;
 
-  fifo_evt_size = sizeof (session_fifo_event_t);
+  fifo_evt_size = sizeof (session_event_t);
   notif_q_size = clib_max (16, queue_size >> 4);
   /* *INDENT-OFF* */
   svm_msg_q_ring_cfg_t rc[SESSION_MQ_N_RINGS] = {
diff --git a/src/vnet/session/session.c b/src/vnet/session/session.c
index 38a0521af94..897cb1a5a1e 100644
--- a/src/vnet/session/session.c
+++ b/src/vnet/session/session.c
@@ -31,7 +31,7 @@ static inline int
 session_send_evt_to_thread (void *data, void *args, u32 thread_index,
 			    session_evt_type_t evt_type)
 {
-  session_fifo_event_t *evt;
+  session_event_t *evt;
   svm_msg_q_msg_t msg;
   svm_msg_q_t *mq;
   u32 tries = 0, max_tries;
@@ -57,7 +57,7 @@ session_send_evt_to_thread (void *data, void *args, u32 thread_index,
       svm_msg_q_unlock (mq);
       return -2;
     }
-  evt = (session_fifo_event_t *) svm_msg_q_msg_data (mq, &msg);
+  evt = (session_event_t *) svm_msg_q_msg_data (mq, &msg);
   evt->event_type = evt_type;
   switch (evt_type)
     {
@@ -78,8 +78,7 @@ session_send_evt_to_thread (void *data, void *args, u32 thread_index,
       return -1;
     }
 
-  svm_msg_q_add_w_lock (mq, &msg);
-  svm_msg_q_unlock (mq);
+  svm_msg_q_add_and_unlock (mq, &msg);
   return 0;
 }
 
@@ -1095,7 +1094,7 @@ stream_session_disconnect (stream_session_t * s)
 {
   u32 thread_index = vlib_get_thread_index ();
   session_manager_main_t *smm = &session_manager_main;
-  session_fifo_event_t *evt;
+  session_event_t *evt;
 
   if (!s)
     return;
@@ -1197,7 +1196,7 @@ session_tx_is_dgram (stream_session_t * s)
 void
 session_vpp_event_queues_allocate (session_manager_main_t * smm)
 {
-  u32 evt_q_length = 2048, evt_size = sizeof (session_fifo_event_t);
+  u32 evt_q_length = 2048, evt_size = sizeof (session_event_t);
   ssvm_private_t *eqs = &smm->evt_qs_segment;
   api_main_t *am = &api_main;
   u64 eqs_size = 64 << 20;
diff --git a/src/vnet/session/session.h b/src/vnet/session/session.h
index 879b3823e5d..19176167b50 100644
--- a/src/vnet/session/session.h
+++ b/src/vnet/session/session.h
@@ -34,10 +34,17 @@ typedef enum
 {
   FIFO_EVENT_APP_RX,
   FIFO_EVENT_APP_TX,
-  FIFO_EVENT_TIMEOUT,
   FIFO_EVENT_DISCONNECT,
   FIFO_EVENT_BUILTIN_RX,
   FIFO_EVENT_RPC,
+  SESSION_CTRL_EVT_ACCEPTED,
+  SESSION_CTRL_EVT_ACCEPTED_REPLY,
+  SESSION_CTRL_EVT_CONNECTED,
+  SESSION_CTRL_EVT_CONNECTED_REPLY,
+  SESSION_CTRL_EVT_DISCONNECTED,
+  SESSION_CTRL_EVT_DISCONNECTED_REPLY,
+  SESSION_CTRL_EVT_RESET,
+  SESSION_CTRL_EVT_RESET_REPLY
 } session_evt_type_t;
 
 static inline const char *
@@ -49,8 +56,6 @@ fifo_event_type_str (session_evt_type_t et)
       return "FIFO_EVENT_APP_RX";
     case FIFO_EVENT_APP_TX:
       return "FIFO_EVENT_APP_TX";
-    case FIFO_EVENT_TIMEOUT:
-      return "FIFO_EVENT_TIMEOUT";
     case FIFO_EVENT_DISCONNECT:
       return "FIFO_EVENT_DISCONNECT";
     case FIFO_EVENT_BUILTIN_RX:
@@ -112,7 +117,7 @@ typedef struct
       u8 data[0];
     };
   };
-} __clib_packed session_fifo_event_t;
+} __clib_packed session_event_t;
 /* *INDENT-ON* */
 
 #define SESSION_MSG_NULL { }
@@ -168,14 +173,14 @@ typedef struct _session_manager_main session_manager_main_t;
 
 typedef int
   (session_fifo_rx_fn) (vlib_main_t * vm, vlib_node_runtime_t * node,
-			session_fifo_event_t * e0, stream_session_t * s0,
+			session_event_t * e0, stream_session_t * s0,
 			int *n_tx_pkts);
 
 extern session_fifo_rx_fn session_tx_fifo_peek_and_snd;
 extern session_fifo_rx_fn session_tx_fifo_dequeue_and_snd;
 extern session_fifo_rx_fn session_tx_fifo_dequeue_internal;
 
-u8 session_node_lookup_fifo_event (svm_fifo_t * f, session_fifo_event_t * e);
+u8 session_node_lookup_fifo_event (svm_fifo_t * f, session_event_t * e);
 
 struct _session_manager_main
 {
@@ -195,13 +200,13 @@ struct _session_manager_main
   u32 **tx_buffers;
 
   /** Per worker-thread vector of partially read events */
-  session_fifo_event_t **free_event_vector;
+  session_event_t **free_event_vector;
 
   /** per-worker active event vectors */
-  session_fifo_event_t **pending_event_vector;
+  session_event_t **pending_event_vector;
 
   /** per-worker postponed disconnects */
-  session_fifo_event_t **pending_disconnects;
+  session_event_t **pending_disconnects;
 
   /** per-worker session context */
   session_tx_context_t *ctx;
diff --git a/src/vnet/session/session_api.c b/src/vnet/session/session_api.c
index f9fddea6148..724aff1598d 100755
--- a/src/vnet/session/session_api.c
+++ b/src/vnet/session/session_api.c
@@ -363,6 +363,207 @@ static session_cb_vft_t session_cb_vft = {
   .del_segment_callback = send_del_segment_callback,
 };
 
+static int
+mq_send_session_accepted_cb (stream_session_t * s)
+{
+  application_t *app = application_get (s->app_index);
+  svm_msg_q_msg_t _msg, *msg = &_msg;
+  svm_msg_q_t *vpp_queue, *app_mq;
+  transport_proto_vft_t *tp_vft;
+  transport_connection_t *tc;
+  stream_session_t *listener;
+  session_accepted_msg_t *mp;
+  session_event_t *evt;
+
+  app_mq = app->event_queue;
+  svm_msg_q_lock_and_alloc_msg_w_ring (app_mq, SESSION_MQ_CTRL_EVT_RING,
+				       SVM_Q_WAIT, msg);
+  svm_msg_q_unlock (app_mq);
+
+  evt = svm_msg_q_msg_data (app_mq, msg);
+  memset (evt, 0, sizeof (*evt));
+  evt->event_type = SESSION_CTRL_EVT_ACCEPTED;
+  mp = (session_accepted_msg_t *) evt->data;
+  mp->context = app->index;
+  mp->server_rx_fifo = pointer_to_uword (s->server_rx_fifo);
+  mp->server_tx_fifo = pointer_to_uword (s->server_tx_fifo);
+
+  if (session_has_transport (s))
+    {
+      listener = listen_session_get (s->listener_index);
+      mp->listener_handle = listen_session_get_handle (listener);
+      if (application_is_proxy (app))
+	{
+	  listener =
+	    application_first_listener (app, session_get_fib_proto (s),
+					session_get_transport_proto (s));
+	  if (listener)
+	    mp->listener_handle = listen_session_get_handle (listener);
+	}
+      vpp_queue = session_manager_get_vpp_event_queue (s->thread_index);
+      mp->vpp_event_queue_address = pointer_to_uword (vpp_queue);
+      mp->handle = session_handle (s);
+      tp_vft = transport_protocol_get_vft (session_get_transport_proto (s));
+      tc = tp_vft->get_connection (s->connection_index, s->thread_index);
+      mp->port = tc->rmt_port;
+      mp->is_ip4 = tc->is_ip4;
+      clib_memcpy (&mp->ip, &tc->rmt_ip, sizeof (tc->rmt_ip));
+    }
+  else
+    {
+      local_session_t *ls = (local_session_t *) s;
+      local_session_t *ll;
+      if (application_local_session_listener_has_transport (ls))
+	{
+	  listener = listen_session_get (ls->listener_index);
+	  mp->listener_handle = listen_session_get_handle (listener);
+	  mp->is_ip4 = session_type_is_ip4 (listener->session_type);
+	}
+      else
+	{
+	  ll = application_get_local_listen_session (app, ls->listener_index);
+	  if (ll->transport_listener_index != ~0)
+	    {
+	      listener = listen_session_get (ll->transport_listener_index);
+	      mp->listener_handle = listen_session_get_handle (listener);
+	    }
+	  else
+	    {
+	      mp->listener_handle = application_local_session_handle (ll);
+	    }
+	  mp->is_ip4 = session_type_is_ip4 (ll->listener_session_type);
+	}
+      mp->handle = application_local_session_handle (ls);
+      mp->port = ls->port;
+      mp->vpp_event_queue_address = ls->client_evt_q;
+      mp->server_event_queue_address = ls->server_evt_q;
+    }
+  svm_msg_q_add (app_mq, msg, SVM_Q_WAIT);
+
+  return 0;
+}
+
+static void
+mq_send_session_disconnected_cb (stream_session_t * s)
+{
+  application_t *app = application_get (s->app_index);
+  svm_msg_q_msg_t _msg, *msg = &_msg;
+  session_disconnected_msg_t *mp;
+  svm_msg_q_t *app_mq;
+  session_event_t *evt;
+
+  app_mq = app->event_queue;
+  svm_msg_q_lock_and_alloc_msg_w_ring (app_mq, SESSION_MQ_CTRL_EVT_RING,
+				       SVM_Q_WAIT, msg);
+  svm_msg_q_unlock (app_mq);
+  evt = svm_msg_q_msg_data (app_mq, msg);
+  memset (evt, 0, sizeof (*evt));
+  evt->event_type = SESSION_CTRL_EVT_DISCONNECTED;
+  mp = (session_disconnected_msg_t *) evt->data;
+  mp->handle = session_handle (s);
+  mp->context = app->api_client_index;
+  svm_msg_q_add (app_mq, msg, SVM_Q_WAIT);
+}
+
+static void
+mq_send_session_reset_cb (stream_session_t * s)
+{
+  application_t *app = application_get (s->app_index);
+  svm_msg_q_msg_t _msg, *msg = &_msg;
+  session_reset_msg_t *mp;
+  svm_msg_q_t *app_mq;
+  session_event_t *evt;
+
+  app_mq = app->event_queue;
+  svm_msg_q_lock_and_alloc_msg_w_ring (app_mq, SESSION_MQ_CTRL_EVT_RING,
+				       SVM_Q_WAIT, msg);
+  svm_msg_q_unlock (app_mq);
+  evt = svm_msg_q_msg_data (app_mq, msg);
+  memset (evt, 0, sizeof (*evt));
+  evt->event_type = SESSION_CTRL_EVT_RESET;
+  mp = (session_reset_msg_t *) evt->data;
+  mp->handle = session_handle (s);
+  svm_msg_q_add (app_mq, msg, SVM_Q_WAIT);
+}
+
+static int
+mq_send_session_connected_cb (u32 app_index, u32 api_context,
+			      stream_session_t * s, u8 is_fail)
+{
+  svm_msg_q_msg_t _msg, *msg = &_msg;
+  session_connected_msg_t *mp;
+  svm_msg_q_t *vpp_mq, *app_mq;
+  transport_connection_t *tc;
+  session_event_t *evt;
+  application_t *app;
+
+  app = application_get (app_index);
+  app_mq = app->event_queue;
+  if (!app_mq)
+    {
+      clib_warning ("app %u with api index: %u not attached", app->index,
+		    app->api_client_index);
+      return -1;
+    }
+
+  svm_msg_q_lock_and_alloc_msg_w_ring (app_mq, SESSION_MQ_CTRL_EVT_RING,
+				       SVM_Q_WAIT, msg);
+  svm_msg_q_unlock (app_mq);
+  evt = svm_msg_q_msg_data (app_mq, msg);
+  memset (evt, 0, sizeof (*evt));
+  evt->event_type = SESSION_CTRL_EVT_CONNECTED;
+  mp = (session_connected_msg_t *) evt->data;
+  mp->context = api_context;
+
+  if (is_fail)
+    goto done;
+
+  if (session_has_transport (s))
+    {
+      tc = session_get_transport (s);
+      if (!tc)
+	{
+	  is_fail = 1;
+	  goto done;
+	}
+
+      vpp_mq = session_manager_get_vpp_event_queue (s->thread_index);
+      mp->handle = session_handle (s);
+      mp->vpp_event_queue_address = pointer_to_uword (vpp_mq);
+      clib_memcpy (mp->lcl_ip, &tc->lcl_ip, sizeof (tc->lcl_ip));
+      mp->is_ip4 = tc->is_ip4;
+      mp->lcl_port = tc->lcl_port;
+      mp->server_rx_fifo = pointer_to_uword (s->server_rx_fifo);
+      mp->server_tx_fifo = pointer_to_uword (s->server_tx_fifo);
+    }
+  else
+    {
+      local_session_t *ls = (local_session_t *) s;
+      mp->handle = application_local_session_handle (ls);
+      mp->lcl_port = ls->port;
+      mp->vpp_event_queue_address = ls->server_evt_q;
+      mp->client_event_queue_address = ls->client_evt_q;
+      mp->server_rx_fifo = pointer_to_uword (s->server_tx_fifo);
+      mp->server_tx_fifo = pointer_to_uword (s->server_rx_fifo);
+    }
+
+done:
+  mp->retval = is_fail ?
+    clib_host_to_net_u32 (VNET_API_ERROR_SESSION_CONNECT) : 0;
+
+  svm_msg_q_add (app_mq, msg, SVM_Q_WAIT);
+  return 0;
+}
+
+static session_cb_vft_t session_mq_cb_vft = {
+  .session_accept_callback = mq_send_session_accepted_cb,
+  .session_disconnect_callback = mq_send_session_disconnected_cb,
+  .session_connected_callback = mq_send_session_connected_cb,
+  .session_reset_callback = mq_send_session_reset_cb,
+  .add_segment_callback = send_add_segment_callback,
+  .del_segment_callback = send_del_segment_callback,
+};
+
 static void
 vl_api_session_enable_disable_t_handler (vl_api_session_enable_disable_t * mp)
 {
@@ -401,7 +602,11 @@ vl_api_application_attach_t_handler (vl_api_application_attach_t * mp)
   memset (a, 0, sizeof (*a));
   a->api_client_index = mp->client_index;
   a->options = mp->options;
-  a->session_cb_vft = &session_cb_vft;
+
+  if (a->options[APP_OPTIONS_FLAGS] & APP_OPTIONS_FLAGS_USE_MQ_FOR_CTRL_MSGS)
+    a->session_cb_vft = &session_mq_cb_vft;
+  else
+    a->session_cb_vft = &session_cb_vft;
 
   if (mp->namespace_id_len > 64)
     {
diff --git a/src/vnet/session/session_cli.c b/src/vnet/session/session_cli.c
index 201f6f1d66e..06d98ae01db 100755
--- a/src/vnet/session/session_cli.c
+++ b/src/vnet/session/session_cli.c
@@ -20,7 +20,7 @@ format_stream_session_fifos (u8 * s, va_list * args)
 {
   stream_session_t *ss = va_arg (*args, stream_session_t *);
   int verbose = va_arg (*args, int);
-  session_fifo_event_t _e, *e = &_e;
+  session_event_t _e, *e = &_e;
   u8 found;
 
   if (!ss->server_rx_fifo || !ss->server_tx_fifo)
diff --git a/src/vnet/session/session_node.c b/src/vnet/session/session_node.c
index 350282bd902..bf0c3959471 100644
--- a/src/vnet/session/session_node.c
+++ b/src/vnet/session/session_node.c
@@ -20,9 +20,154 @@
 #include <vnet/session/transport.h>
 #include <vnet/session/session.h>
 #include <vnet/session/application.h>
+#include <vnet/session/application_interface.h>
 #include <vnet/session/session_debug.h>
 #include <svm/queue.h>
 
+static void
+session_mq_accepted_reply_handler (void *data)
+{
+  session_accepted_reply_msg_t *mp = (session_accepted_reply_msg_t *) data;
+  vnet_disconnect_args_t _a = { 0 }, *a = &_a;
+  local_session_t *ls;
+  stream_session_t *s;
+
+  /* Server isn't interested, kill the session */
+  if (mp->retval)
+    {
+      a->app_index = mp->context;
+      a->handle = mp->handle;
+      vnet_disconnect_session (a);
+      return;
+    }
+
+  if (session_handle_is_local (mp->handle))
+    {
+      ls = application_get_local_session_from_handle (mp->handle);
+      if (!ls || ls->app_index != mp->context)
+	{
+	  clib_warning ("server %u doesn't own local handle %llu",
+			mp->context, mp->handle);
+	  return;
+	}
+      if (application_local_session_connect_notify (ls))
+	return;
+      ls->session_state = SESSION_STATE_READY;
+    }
+  else
+    {
+      s = session_get_from_handle_if_valid (mp->handle);
+      if (!s)
+	{
+	  clib_warning ("session doesn't exist");
+	  return;
+	}
+      if (s->app_index != mp->context)
+	{
+	  clib_warning ("app doesn't own session");
+	  return;
+	}
+      s->session_state = SESSION_STATE_READY;
+    }
+}
+
+static void
+session_mq_reset_reply_handler (void *data)
+{
+  session_reset_reply_msg_t *mp;
+  application_t *app;
+  stream_session_t *s;
+  u32 index, thread_index;
+
+  mp = (session_reset_reply_msg_t *) data;
+  app = application_lookup (mp->client_index);
+  if (!app)
+    return;
+
+  session_parse_handle (mp->handle, &index, &thread_index);
+  s = session_get_if_valid (index, thread_index);
+  if (s == 0 || app->index != s->app_index)
+    {
+      clib_warning ("Invalid session!");
+      return;
+    }
+
+  /* Client objected to resetting the session, log and continue */
+  if (mp->retval)
+    {
+      clib_warning ("client retval %d", mp->retval);
+      return;
+    }
+
+  /* This comes as a response to a reset, transport only waiting for
+   * confirmation to remove connection state, no need to disconnect */
+  stream_session_cleanup (s);
+}
+
+static void
+session_mq_disconnected_handler (void *data)
+{
+  session_disconnected_reply_msg_t *rmp;
+  vnet_disconnect_args_t _a, *a = &_a;
+  svm_msg_q_msg_t _msg, *msg = &_msg;
+  session_disconnected_msg_t *mp;
+  session_event_t *evt;
+  application_t *app;
+  int rv = 0;
+
+  mp = (session_disconnected_msg_t *) data;
+  app = application_lookup (mp->client_index);
+  if (app)
+    {
+      a->handle = mp->handle;
+      a->app_index = app->index;
+      rv = vnet_disconnect_session (a);
+    }
+  else
+    {
+      rv = VNET_API_ERROR_APPLICATION_NOT_ATTACHED;
+    }
+
+  svm_msg_q_lock_and_alloc_msg_w_ring (app->event_queue,
+				       SESSION_MQ_CTRL_EVT_RING,
+				       SVM_Q_WAIT, msg);
+  svm_msg_q_unlock (app->event_queue);
+  evt = svm_msg_q_msg_data (app->event_queue, msg);
+  memset (evt, 0, sizeof (*evt));
+  evt->event_type = SESSION_CTRL_EVT_DISCONNECTED;
+  rmp = (session_disconnected_reply_msg_t *) evt->data;
+  rmp->handle = mp->handle;
+  rmp->context = mp->context;
+  rmp->retval = rv;
+  svm_msg_q_add (app->event_queue, msg, SVM_Q_WAIT);
+}
+
+static void
+session_mq_disconnected_reply_handler (void *data)
+{
+  session_disconnected_reply_msg_t *mp;
+  vnet_disconnect_args_t _a, *a = &_a;
+  application_t *app;
+
+  mp = (session_disconnected_reply_msg_t *) data;
+
+  /* Client objected to disconnecting the session, log and continue */
+  if (mp->retval)
+    {
+      clib_warning ("client retval %d", mp->retval);
+      return;
+    }
+
+  /* Disconnect has been confirmed. Confirm close to transport */
+  app = application_lookup (mp->context);
+  if (app)
+    {
+      a->handle = mp->handle;
+      a->app_index = app->index;
+      vnet_disconnect_session (a);
+    }
+}
+
 vlib_node_registration_t session_queue_node;
 
 typedef struct
@@ -44,8 +189,6 @@ format_session_queue_trace (u8 * s, va_list * args)
   return s;
 }
 
-vlib_node_registration_t session_queue_node;
-
 #define foreach_session_queue_error		\
 _(TX, "Packets transmitted")                  	\
 _(TIMER, "Timer events")			\
@@ -72,7 +215,6 @@ enum
   SESSION_TX_OK
 };
 
-
 static void
 session_tx_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node,
 			u32 next_index, u32 * to_next, u16 n_segs,
@@ -369,7 +511,7 @@ session_tx_set_dequeue_params (vlib_main_t * vm, session_tx_context_t * ctx,
 
 always_inline int
 session_tx_fifo_read_and_snd_i (vlib_main_t * vm, vlib_node_runtime_t * node,
-				session_fifo_event_t * e,
+				session_event_t * e,
 				stream_session_t * s, int *n_tx_packets,
 				u8 peek_data)
 {
@@ -538,7 +680,7 @@ session_tx_fifo_read_and_snd_i (vlib_main_t * vm, vlib_node_runtime_t * node,
 
 int
 session_tx_fifo_peek_and_snd (vlib_main_t * vm, vlib_node_runtime_t * node,
-			      session_fifo_event_t * e,
+			      session_event_t * e,
 			      stream_session_t * s, int *n_tx_pkts)
 {
   return session_tx_fifo_read_and_snd_i (vm, node, e, s, n_tx_pkts, 1);
@@ -546,7 +688,7 @@ session_tx_fifo_peek_and_snd (vlib_main_t * vm, vlib_node_runtime_t * node,
 
 int
 session_tx_fifo_dequeue_and_snd (vlib_main_t * vm, vlib_node_runtime_t * node,
-				 session_fifo_event_t * e,
+				 session_event_t * e,
 				 stream_session_t * s, int *n_tx_pkts)
 {
   return session_tx_fifo_read_and_snd_i (vm, node, e, s, n_tx_pkts, 0);
@@ -555,7 +697,7 @@ session_tx_fifo_dequeue_and_snd (vlib_main_t * vm, vlib_node_runtime_t * node,
 int
 session_tx_fifo_dequeue_internal (vlib_main_t * vm,
 				  vlib_node_runtime_t * node,
-				  session_fifo_event_t * e,
+				  session_event_t * e,
 				  stream_session_t * s, int *n_tx_pkts)
 {
   application_t *app;
@@ -565,7 +707,7 @@ session_tx_fifo_dequeue_internal (vlib_main_t * vm,
 }
 
 always_inline stream_session_t *
-session_event_get_session (session_fifo_event_t * e, u8 thread_index)
+session_event_get_session (session_event_t * e, u8 thread_index)
 {
   return session_get_if_valid (e->fifo->master_session_index, thread_index);
 }
@@ -576,8 +718,8 @@ session_queue_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
 {
   session_manager_main_t *smm = vnet_get_session_manager_main ();
   u32 thread_index = vm->thread_index, n_to_dequeue, n_events;
-  session_fifo_event_t *pending_events, *e;
-  session_fifo_event_t *fifo_events;
+  session_event_t *pending_events, *e;
+  session_event_t *fifo_events;
   svm_msg_q_msg_t _msg, *msg = &_msg;
   f64 now = vlib_time_now (vm);
   int n_tx_packets = 0, i, rv;
@@ -644,7 +786,7 @@ skip_dequeue:
   for (i = 0; i < n_events; i++)
     {
       stream_session_t *s;	/* $$$ prefetch 1 ahead maybe */
-      session_fifo_event_t *e;
+      session_event_t *e;
       u32 to_dequeue;
 
       e = &fifo_events[i];
@@ -715,7 +857,20 @@ skip_dequeue:
 	  fp = e->rpc_args.fp;
 	  (*fp) (e->rpc_args.arg);
 	  break;
-
+	case SESSION_CTRL_EVT_DISCONNECTED:
+	  session_mq_disconnected_handler (e->data);
+	  break;
+	case SESSION_CTRL_EVT_ACCEPTED_REPLY:
+	  session_mq_accepted_reply_handler (e->data);
+	  break;
+	case SESSION_CTRL_EVT_CONNECTED_REPLY:
+	  break;
+	case SESSION_CTRL_EVT_DISCONNECTED_REPLY:
+	  session_mq_disconnected_reply_handler (e->data);
+	  break;
+	case SESSION_CTRL_EVT_RESET_REPLY:
+	  session_mq_reset_reply_handler (e->data);
+	  break;
 	default:
 	  clib_warning ("unhandled event type %d", e->event_type);
 	}
@@ -751,7 +906,7 @@ dump_thread_0_event_queue (void)
   session_manager_main_t *smm = vnet_get_session_manager_main ();
   vlib_main_t *vm = &vlib_global_main;
   u32 my_thread_index = vm->thread_index;
-  session_fifo_event_t _e, *e = &_e;
+  session_event_t _e, *e = &_e;
   svm_msg_q_ring_t *ring;
   stream_session_t *s0;
   svm_msg_q_msg_t *msg;
@@ -804,7 +959,7 @@ dump_thread_0_event_queue (void)
 }
 
 static u8
-session_node_cmp_event (session_fifo_event_t * e, svm_fifo_t * f)
+session_node_cmp_event (session_event_t * e, svm_fifo_t * f)
 {
   stream_session_t *s;
   switch (e->event_type)
@@ -834,11 +989,11 @@ session_node_cmp_event (session_fifo_event_t * e, svm_fifo_t * f)
 }
 
 u8
-session_node_lookup_fifo_event (svm_fifo_t * f, session_fifo_event_t * e)
+session_node_lookup_fifo_event (svm_fifo_t * f, session_event_t * e)
 {
   session_manager_main_t *smm = vnet_get_session_manager_main ();
   svm_msg_q_t *mq;
-  session_fifo_event_t *pending_event_vector, *evt;
+  session_event_t *pending_event_vector, *evt;
   int i, index, found = 0;
   svm_msg_q_msg_t *msg;
   svm_msg_q_ring_t *ring;