NPE_RXBUF
error = npe_dma_setup(sc, &sc->rxdma, "rx", NPE_RXBUF, 1);
ixpqmgr_qconfig(sc->rx_qid, NPE_RXBUF, 0, 1,
ixpqmgr_qconfig(sc->rx_freeqid, NPE_RXBUF, 0, NPE_RXBUF/2, 0, NULL, sc);