XGBE_RX_DESC_CNT
if (xgbe_rx_dirty_desc(ring) > (XGBE_RX_DESC_CNT >> 3))
BUILD_BUG_ON_NOT_POWER_OF_2(XGBE_RX_DESC_CNT);
pdata->rx_desc_count = XGBE_RX_DESC_CNT;