- {
- ip_csum_t sum;
- u16 old,new;
-
- old = 0;
- new = ip4->length;
-
- sum = ip4->checksum;
- sum = ip_csum_update (sum, old, new, ip4_header_t, length);
- ip4->checksum = ip_csum_fold (sum);
- }
+ {
+ if (PREDICT_FALSE (b->flags & VNET_BUFFER_F_GSO))
+ {
+ vnet_buffer2 (b)->outer_l3_hdr_offset = (u8 *) ip4 - b->data;
+ vnet_buffer_offload_flags_set (b, VNET_BUFFER_OFFLOAD_F_TNL_IPIP |
+ VNET_BUFFER_OFFLOAD_F_OUTER_IP_CKSUM);
+ }
+ else
+ {
+ ip_csum_t sum;
+ u16 old,new;
+ old = 0;
+ new = ip4->length;
+ sum = ip4->checksum;
+ sum = ip_csum_update (sum, old, new, ip4_header_t, length);
+ ip4->checksum = ip_csum_fold (sum);
+ }
+ }