ETH:optimized double is_tagged check
a double version of is_tagged, uses "free lanes" in _mm_cmpeq_epi16
to check a second tag
this code was not yet tested for performance
@@ -285,6 +285,29 @@ determine_next_node (ethernet_main_t * em,
}
}
+static_always_inline int
+ethernet_frame_is_any_tagged (u16 type0, u16 type1)
+{
+#if __SSE4_2__
+ const __m128i ethertype_mask = _mm_set_epi16 (ETHERNET_TYPE_VLAN,
+ ETHERNET_TYPE_DOT1AD,
+ ETHERNET_TYPE_VLAN_9100,
+ ETHERNET_TYPE_VLAN_9200,
+ /* duplicate for type1 */
+ ETHERNET_TYPE_VLAN,
+ ETHERNET_TYPE_DOT1AD,
+ ETHERNET_TYPE_VLAN_9100,
+ ETHERNET_TYPE_VLAN_9200);
+
+ __m128i r =
+ _mm_set_epi16 (type0, type0, type0, type0, type1, type1, type1, type1);
+ r = _mm_cmpeq_epi16 (ethertype_mask, r);
+ return !_mm_test_all_zeros (r, r);
+#else
+ return ethernet_frame_is_tagged (type0) || ethernet_frame_istagged (type1);
+#endif
+}
+
static_always_inline uword
ethernet_input_inline (vlib_main_t * vm,
vlib_node_runtime_t * node,
@@ -377,8 +400,7 @@ ethernet_input_inline (vlib_main_t * vm,
/* Speed-path for the untagged case */
if (PREDICT_TRUE (variant == ETHERNET_INPUT_VARIANT_ETHERNET
- && !ethernet_frame_is_tagged (type0)
- && !ethernet_frame_is_tagged (type1)))
+ && !ethernet_frame_is_any_tagged (type0, type1)))
{
main_intf_t *intf0;
subint_config_t *subint0;
