EMX_CSUM_FEATURES
ifp->if_hwassist |= EMX_CSUM_FEATURES;
ifp->if_hwassist &= ~EMX_CSUM_FEATURES;
} else if (m_head->m_pkthdr.csum_flags & EMX_CSUM_FEATURES) {
ifp->if_hwassist = EMX_CSUM_FEATURES | CSUM_TSO;
csum_flags = mp->m_pkthdr.csum_flags & EMX_CSUM_FEATURES;