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ETH:optimized double is_tagged check

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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

Change-Id: I640017e1cc75c85a33d196ee911a7e4a512d9849
Signed-off-by: Eyal Bari <ebari@cisco.com>
This commit is contained in:
Eyal Bari
2017-06-13 08:42:35 +03:00
committed by John Lo
parent 7968e6cad5
commit 9a1ae1ac76
1 changed files with 24 additions and 2 deletions
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26
src/vnet/ethernet/node.c
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@ -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;