NEP_NRCDESC
KASSERT(idx < NEP_NRCDESC);
if (sc->sc_rx_cons >= NEP_NRCDESC)
val |= (uint64_t)NEP_NRCDESC << RCRCFIG_A_LEN_SHIFT;
sc->sc_rcring = nep_dmamem_alloc(sc, NEP_NRCDESC * sizeof(uint64_t));