MY_TXOWN
if (MY_TXOWN(sc->my_cdata.my_tx_head) == MY_UNSENT) {
MY_TXOWN(sc->my_cdata.my_tx_head) = MY_OWNByNIC;
MY_TXOWN(cur_tx) = MY_OWNByNIC;
MY_TXOWN(start_tx) = MY_OWNByNIC;