GMAC_OWN
dp->cmd = htole32(GMAC_OWN);
if (cmd & GMAC_OWN)
dp->cmd = htole32(GMAC_OWN);
dp->cmd = htole32(GMAC_OWN);
dp->cmd = htole32(tlen | GMAC_OWN | GMAC_SOP);
sc->sc_rxlist[i].cmd = htole32(GMAC_OWN);