2 files changed, 29 insertions, 0 deletions

diff --git a/src/vnet/session/session.h b/src/vnet/session/session.h
index 1d3ae0ca4b2..f738f3957e2 100644
--- a/src/vnet/session/session.h
+++ b/src/vnet/session/session.h
@@ -116,6 +116,12 @@ typedef struct session_worker_
   /** Peekers rw lock */
   clib_rwlock_t peekers_rw_locks;
 
+  /** Vector of buffers to be sent */
+  u32 *pending_tx_buffers;
+
+  /** Vector of nexts for the pending tx buffers */
+  u16 *pending_tx_nexts;
+
 #if SESSION_DEBUG
   /** last event poll time by thread */
   f64 last_event_poll;
@@ -611,6 +617,15 @@ do {									\
 int session_main_flush_enqueue_events (u8 proto, u32 thread_index);
 int session_main_flush_all_enqueue_events (u8 transport_proto);
 void session_flush_frames_main_thread (vlib_main_t * vm);
+
+always_inline void
+session_add_pending_tx_buffer (session_type_t st, u32 thread_index, u32 bi)
+{
+  session_worker_t *wrk = session_main_get_worker (thread_index);
+  vec_add1 (wrk->pending_tx_buffers, bi);
+  vec_add1 (wrk->pending_tx_nexts, session_main.session_type_to_next[st]);
+}
+
 ssvm_private_t *session_main_get_evt_q_segment (void);
 void session_node_enable_disable (u8 is_en);
 clib_error_t *vnet_session_enable_disable (vlib_main_t * vm, u8 is_en);
diff --git a/src/vnet/session/session_node.c b/src/vnet/session/session_node.c
index f51b892736a..a32abb07f90 100644
--- a/src/vnet/session/session_node.c
+++ b/src/vnet/session/session_node.c
@@ -1235,6 +1235,17 @@ session_evt_add_to_list (session_worker_t * wrk, session_event_t * evt)
     }
 }
 
+static void
+session_flush_pending_tx_buffers (session_worker_t * wrk,
+				  vlib_node_runtime_t * node)
+{
+  vlib_buffer_enqueue_to_next (wrk->vm, node, wrk->pending_tx_buffers,
+			       wrk->pending_tx_nexts,
+			       vec_len (wrk->pending_tx_nexts));
+  vec_reset_length (wrk->pending_tx_buffers);
+  vec_reset_length (wrk->pending_tx_nexts);
+}
+
 static uword
 session_queue_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
 		       vlib_frame_t * frame)
@@ -1337,6 +1348,9 @@ session_queue_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node,
 	break;
     };
 
+  if (vec_len (wrk->pending_tx_buffers))
+    session_flush_pending_tx_buffers (wrk, node);
+
   vlib_node_increment_counter (vm, session_queue_node.index,
 			       SESSION_QUEUE_ERROR_TX, n_tx_packets);