Add vxlan-bypass feature to IP4 forwarding path

Added vxlan-bypass feature which can be enabled on the underlay
interface which receive VXLAN packets to accelerate VXLAN decap
processing. The CLI to enable it is:
    set interface ip vxlan-bypass <interface> [del]
With this feature enabled on an interface, there is an overhead for
non-VXLAN packets at about 13 clocks per packet.
The API is created to support vxlan-bypass for both VXLANoIPv4 and
VXLANoIPv6. With this change, vxlan-bypass is only implemented for
IPv4 forwarding path.

Change-Id: Ica7239f642010b231eade7fd5009aa4b42c119d3
Signed-off-by: John Lo <loj@cisco.com>

1 files changed, 8 insertions, 2 deletions

diff --git a/vnet/vnet/ip/ip4_forward.c b/vnet/vnet/ip/ip4_forward.c
index fa8ec4e644c..d6fd380815b 100644
--- a/vnet/vnet/ip/ip4_forward.c
+++ b/vnet/vnet/ip/ip4_forward.c
@@ -973,6 +973,12 @@ VNET_FEATURE_INIT (ip4_ipsec, static) = {
 VNET_FEATURE_INIT (ip4_vpath, static) = {
   .arc_name = "ip4-unicast",
   .node_name = "vpath-input-ip4",
+  .runs_before = VNET_FEATURES ("ip4-vxlan-bypass"),
+};
+
+VNET_FEATURE_INIT (ip4_vxlan_bypass, static) = {
+  .arc_name = "ip4-unicast",
+  .node_name = "ip4-vxlan-bypass",
   .runs_before = VNET_FEATURES ("ip4-lookup"),
 };
 
@@ -1143,7 +1149,7 @@ typedef struct {
   u8 packet_data[64 - 1*sizeof(u32)];
 } ip4_forward_next_trace_t;
 
-static u8 * format_ip4_forward_next_trace (u8 * s, va_list * args)
+u8 * format_ip4_forward_next_trace (u8 * s, va_list * args)
 {
   CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
   CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
@@ -1389,7 +1395,7 @@ ip4_tcp_udp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0,
   return sum16;
 }
 
-static u32
+u32
 ip4_tcp_udp_validate_checksum (vlib_main_t * vm, vlib_buffer_t * p0)
 {
   ip4_header_t * ip0 = vlib_buffer_get_current (p0);