FLAG_RX_CSUM_ENABLED
if (fep->csum_flags & FLAG_RX_CSUM_ENABLED)
if (fep->csum_flags & FLAG_RX_CSUM_ENABLED) {
fep->csum_flags |= FLAG_RX_CSUM_ENABLED;
fep->csum_flags &= ~FLAG_RX_CSUM_ENABLED;
fep->csum_flags |= FLAG_RX_CSUM_ENABLED;