AXGE_CSUM_FEATURES
if_sethwassist(ifp, AXGE_CSUM_FEATURES);
(m->m_pkthdr.csum_flags & AXGE_CSUM_FEATURES) == 0)
if_sethwassistbits(ifp, AXGE_CSUM_FEATURES, 0);
if_sethwassistbits(ifp, 0, AXGE_CSUM_FEATURES);