RX_REG_DESC_SIZE
desc = priv->rx_desc_base + i * RX_REG_DESC_SIZE;
memset(desc, 0, RX_REG_DESC_SIZE);
desc = priv->rx_desc_base + (RX_REG_DESC_SIZE * rx_head);
priv->rx_desc_base = dma_alloc_coherent(p_dev, RX_REG_DESC_SIZE *
RX_REG_DESC_SIZE * RX_DESC_NUM,