get_inner_l4_info
get_inner_l4_info(skb, &l4, TX_OFFLOAD_TSO, l4_proto, &l4_offload,
get_inner_l4_info(skb, &l4, TX_OFFLOAD_CSUM, l4_proto, &l4_offload,
get_inner_l4_info(skb, &l4, l4_proto, &offset, &l4_offload);