GTMPSC_NRXDESC
for (i = 0; i < GTMPSC_NRXDESC; i++) {
sc->sc_rcvdrx = (ix + 1) % GTMPSC_NRXDESC;
sc->sc_rcvrx = (ix + 1) % GTMPSC_NRXDESC;
gtmpsc_pollrx_t rx[GTMPSC_NRXDESC];