l2 input: avoid per-packet trace checks in the fast path

[vpp.git] / src / vnet / l2 / l2_input.c

diff --git a/src/vnet/l2/l2_input.c b/src/vnet/l2/l2_input.c
index a104ec9..ead9ca8 100644 (file)
--- a/src/vnet/l2/l2_input.c
+++ b/src/vnet/l2/l2_input.c
@@ -222,10 +222,10 @@ classify_and_dispatch (vlib_main_t * vm,
                                            feature_bitmap);
 }
 
-
-static uword
-l2input_node_fn (vlib_main_t * vm,
-                vlib_node_runtime_t * node, vlib_frame_t * frame)
+static_always_inline uword
+l2input_node_inline (vlib_main_t * vm,
+                    vlib_node_runtime_t * node, vlib_frame_t * frame,
+                    int do_trace)
 {
   u32 n_left_from, *from, *to_next;
   l2input_next_t next_index;
@@ -294,7 +294,7 @@ l2input_node_fn (vlib_main_t * vm,
          b2 = vlib_get_buffer (vm, bi2);
          b3 = vlib_get_buffer (vm, bi3);
 
-         if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
+         if (do_trace)
            {
              /* RX interface handles */
              sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
@@ -373,8 +373,7 @@ l2input_node_fn (vlib_main_t * vm,
 
          b0 = vlib_get_buffer (vm, bi0);
 
-         if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
-                            && (b0->flags & VLIB_BUFFER_IS_TRACED)))
+         if (do_trace && PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
            {
              ethernet_header_t *h0 = vlib_buffer_get_current (b0);
              l2input_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t));
@@ -401,6 +400,14 @@ l2input_node_fn (vlib_main_t * vm,
   return frame->n_vectors;
 }
 
+static uword
+l2input_node_fn (vlib_main_t * vm,
+                vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+  if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
+    return l2input_node_inline (vm, node, frame, 1 /* do_trace */ );
+  return l2input_node_inline (vm, node, frame, 0 /* do_trace */ );
+}
 
 /* *INDENT-OFF* */
 VLIB_REGISTER_NODE (l2input_node) = {