STRUCT_SIZE_OF (vlib_buffer_t, opaque2),
"VNET buffer opaque2 meta-data too large for vlib_buffer");
-#define gso_mtu_sz(b) (vnet_buffer2(b)->gso_size + vnet_buffer2(b)->gso_l4_hdr_sz + vnet_buffer(b)->l4_hdr_offset)
+#define gso_mtu_sz(b) (vnet_buffer2(b)->gso_size + \
+ vnet_buffer2(b)->gso_l4_hdr_sz + \
+ vnet_buffer(b)->l4_hdr_offset - \
+ vnet_buffer (b)->l3_hdr_offset)
format_function_t format_vnet_buffer;