DESC_LINK
desc[DESC_LINK] = cpu_to_le32(dev->tx_phy_descs + (free_idx * DESC_SIZE * 4));
dev->tx_descs[(i * DESC_SIZE) + DESC_LINK]
#define DESC_BUFPTR (DESC_LINK + HW_ADDR_LEN/4)
desc_addr_set(desc + DESC_LINK, link);
dprintk("link: %08x\n", cpu_to_le32(desc[DESC_LINK]));