RT2661_TX_RING_COUNT
txq->cur = (txq->cur + 1) % RT2661_TX_RING_COUNT;
txq->cur = (txq->cur + 1) % RT2661_TX_RING_COUNT;
if (sc->txq[ac].queued >= RT2661_TX_RING_COUNT - 1) {
RT2661_TX_RING_COUNT << 24 |
RT2661_TX_RING_COUNT << 16 |
RT2661_TX_RING_COUNT << 8 |
RT2661_TX_RING_COUNT);
RT2661_TX_RING_COUNT << 8 | /* XXX: HCCA ring unused */
RT2661_TX_RING_COUNT);