RX_NEXT
htole32(sc->rx.desc_ring_paddr + DESC_OFF(RX_NEXT(index)));
for (index = sc->rx.cur; ; index = RX_NEXT(index)) {
index = RX_NEXT(index);
for (index = sc->sc_rx.cur; ; index = RX_NEXT(index)) {
for (i = sc->sc_rxq.r_cur; ; i = RX_NEXT(i)) {
next = RX_NEXT(i);