NFE_CSUM_FEATURES
if_sethwassistbits(ifp, NFE_CSUM_FEATURES, 0);
if_sethwassistbits(ifp, 0, NFE_CSUM_FEATURES);
} else if ((m->m_pkthdr.csum_flags & NFE_CSUM_FEATURES) != 0) {
if_sethwassistbits(ifp, NFE_CSUM_FEATURES | CSUM_TSO, 0);