diff options
| author |   Damjan Marion <damarion@cisco.com> | 2016-09-19 11:32:03 +0200 |
|---|---|---|
| committer |   John Lo <loj@cisco.com> | 2016-09-20 17:37:02 +0000 |
| commit | b94bdad5c04450aad59feb8a5806a87fe37da088 (patch) | |
| tree | 3b4bd38253e5b00d76c8a66ae83dc710f3a10003 /vnet/vnet/ethernet/ethernet.h | |
| parent | 48a9a54e7c8e295c0cba3491a05c8aa0a5a1f81a (diff) | |
Use SSE instructions for matching tagged frames by ethertype
This change improves performance in l2 scenarios for about 1-2%.
Change-Id: Ie35ed8ad70a3b95dd78c0d158c485a10dabaf0eb
Signed-off-by: Damjan Marion <damarion@cisco.com>
Diffstat (limited to 'vnet/vnet/ethernet/ethernet.h')
| -rw-r--r-- | vnet/vnet/ethernet/ethernet.h | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/vnet/vnet/ethernet/ethernet.h b/vnet/vnet/ethernet/ethernet.h index b5c4ee919e5..8a1369c1093 100644 --- a/vnet/vnet/ethernet/ethernet.h +++ b/vnet/vnet/ethernet/ethernet.h @@ -60,6 +60,33 @@ ethernet_mac_address_is_multicast_u64 (u64 a) return (a & (1ULL << (5 * 8))) != 0; } +static_always_inline int +ethernet_frame_is_tagged (u16 type) +{ +#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 last one to + fill register */ + ETHERNET_TYPE_VLAN_9200, + ETHERNET_TYPE_VLAN_9200, + ETHERNET_TYPE_VLAN_9200, + ETHERNET_TYPE_VLAN_9200); + + __m128i r = _mm_set1_epi16 (type); + r = _mm_cmpeq_epi16 (ethertype_mask, r); + return !_mm_test_all_zeros (r, r); +#else + if ((type == ETHERNET_TYPE_VLAN) || + (type == ETHERNET_TYPE_DOT1AD) || + (type == ETHERNET_TYPE_VLAN_9100) || (type == ETHERNET_TYPE_VLAN_9200)) + return 1; +#endif + return 0; +} + /* Max. sized ethernet/vlan header for parsing. */ typedef struct { |