X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=src%2Fvnet%2Fip%2Fip4.h;h=74faa05947e9937af5c0263d427c723dcfc51064;hb=66b11318a1e5f24880e3ec77c95d70647732a4a8;hp=71640defb21af96dc6187e0ba250f793158cdcfb;hpb=a3af337e06a79f7d1dacf42a319f241c907122fc;p=vpp.git

diff --git a/src/vnet/ip/ip4.h b/src/vnet/ip/ip4.h
index 71640defb21..74faa05947e 100644
--- a/src/vnet/ip/ip4.h
+++ b/src/vnet/ip/ip4.h
@@ -42,6 +42,7 @@
 
 #include <vnet/ip/ip4_packet.h>
 #include <vnet/ip/lookup.h>
+#include <vnet/buffer.h>
 #include <vnet/feature/feature.h>
 
 typedef struct ip4_mfib_t
@@ -328,7 +329,8 @@ u32 ip4_tcp_udp_validate_checksum (vlib_main_t * vm, vlib_buffer_t * p0);
  */
 always_inline void *
 vlib_buffer_push_ip4 (vlib_main_t * vm, vlib_buffer_t * b,
-		      ip4_address_t * src, ip4_address_t * dst, int proto)
+		      ip4_address_t * src, ip4_address_t * dst, int proto,
+		      u8 csum_offload)
 {
   ip4_header_t *ih;
 
@@ -346,7 +348,16 @@ vlib_buffer_push_ip4 (vlib_main_t * vm, vlib_buffer_t * b,
   ih->src_address.as_u32 = src->as_u32;
   ih->dst_address.as_u32 = dst->as_u32;
 
-  ih->checksum = ip4_header_checksum (ih);
+  /* Offload ip4 header checksum generation */
+  if (csum_offload)
+    {
+      ih->checksum = 0;
+      b->flags |= VNET_BUFFER_F_OFFLOAD_IP_CKSUM | VNET_BUFFER_F_IS_IP4;
+      vnet_buffer (b)->l3_hdr_offset = (u8 *) ih - b->data;
+    }
+  else
+    ih->checksum = ip4_header_checksum (ih);
+
   return ih;
 }
 #endif /* included_ip_ip4_h */