RT2661_TX_RING_COUNT
if (ring->queued > RT2661_TX_RING_COUNT - 8) {
ring->cur = (ring->cur + 1) % RT2661_TX_RING_COUNT;
RT2661_TX_RING_COUNT << 24 |
RT2661_TX_RING_COUNT << 16 |
RT2661_TX_RING_COUNT << 8 |
RT2661_TX_RING_COUNT);
RT2661_TX_RING_COUNT << 8 |
RT2661_TX_RING_COUNT);