next_bd
struct eth_tx_next_bd next_bd;
&txdata->tx_desc_ring[TX_DESC_CNT * i - 1].next_bd;
txbd->next_bd.addr_hi = cpu_to_le32(val);
txbd->next_bd.addr_lo = cpu_to_le32(val);
ep->conf_td = next_bd(ep->td_base, ep->conf_td, td_status);
ep->empty_td = next_bd(ep->td_base, ep->empty_td, td_status);
td = next_bd(ep->td_base, td, td_status);
td = next_bd(ep->td_base, td, td_status);
ep->conf_td = next_bd(ep->td_base, ep->conf_td,
ep->empty_td = next_bd(ep->td_base, ep->empty_td, td_status);