VTNET_CSUM_OFFLOAD_IPV6
if_togglehwassist(ifp, VTNET_CSUM_OFFLOAD_IPV6);
if (flags & (VTNET_CSUM_OFFLOAD | VTNET_CSUM_OFFLOAD_IPV6)) {
etype != ETHERTYPE_IP) || (flags & VTNET_CSUM_OFFLOAD_IPV6
if_sethwassistbits(ifp, VTNET_CSUM_OFFLOAD_IPV6, 0);
(VTNET_CSUM_OFFLOAD | VTNET_CSUM_OFFLOAD_IPV6 | CSUM_TSO)