arn_get_hal_qnum
int arn_get_hal_qnum(uint16_t queue, struct arn_softc *sc);
txq = &sc->sc_txq[arn_get_hal_qnum(ac, sc)];
txq = &sc->sc_txq[arn_get_hal_qnum(WME_AC_VO, sc)];
txq = &sc->sc_txq[arn_get_hal_qnum(WME_AC_VO, sc)];
txq = &sc->sc_txq[arn_get_hal_qnum(WME_AC_BE, sc)];
qnum = arn_get_hal_qnum(qos_ac, sc);