TULIP_NEXTTX
for (i = txs->txs_firstdesc;; i = TULIP_NEXTTX(i)) {
txd->td_bufaddr2 = htole32(TULIP_CDTXADDR(sc, TULIP_NEXTTX(i)));
sc->sc_txnext = TULIP_NEXTTX(nexttx);
seg++, nexttx = TULIP_NEXTTX(nexttx)) {
for (seg = sc->sc_txnext;; seg = TULIP_NEXTTX(seg)) {