nxge_hio_addres
rv = nxge_hio_addres(vr, MAC_RING_TYPE_TX, &tmap);
rv = nxge_hio_addres(vr, MAC_RING_TYPE_RX, &rmap);
static int nxge_hio_addres(nxge_hio_vr_t *, mac_ring_type_t, uint64_t *);