RT2661_RX_DESC_SIZE
ring->cur * RT2661_RX_DESC_SIZE,
RT2661_RX_DESC_SIZE,
size = count * RT2661_RX_DESC_SIZE;
ring->cur * RT2661_RX_DESC_SIZE,
RT2661_RX_DESC_SIZE,
#define RT2661_RX_DESC_WSIZE (RT2661_RX_DESC_SIZE / 4)