JME_CSUM_FEATURES
JME_CSUM_FEATURES | CSUM_TSO);
if_sethwassistbits(ifp, JME_CSUM_FEATURES, 0);
if_sethwassistbits(ifp, 0, JME_CSUM_FEATURES);
if_sethwassist(ifp, JME_CSUM_FEATURES | CSUM_TSO);