int af_packet_delete_if (vlib_main_t * vm, u8 * host_if_name);
int af_packet_set_l4_cksum_offload (vlib_main_t * vm, u32 sw_if_index,
u8 set);
int af_packet_delete_if (vlib_main_t * vm, u8 * host_if_name);
int af_packet_set_l4_cksum_offload (vlib_main_t * vm, u32 sw_if_index,
u8 set);