TULIP_TXDESCS
error = tulip_busdma_allocmem(sc, sizeof(tulip_desc_t) * TULIP_TXDESCS,
while (error == 0 && sc->tulip_num_free_txmaps < TULIP_TXDESCS) {
tulip_initring(sc, &sc->tulip_txinfo, sc->tulip_txdescs, TULIP_TXDESCS);
bus_dmamap_t tulip_free_txmaps[TULIP_TXDESCS];