RX_LE_SIZE
sky2->rx_put = RING_NEXT(sky2->rx_put, RX_LE_SIZE);
sky2_prefetch_init(hw, rxq, sky2->rx_le_map, RX_LE_SIZE - 1);
#define RX_LE_BYTES (RX_LE_SIZE*sizeof(struct sky2_rx_le))
#define RX_MAX_PENDING (RX_LE_SIZE/6 - 2)