MVXPE_TX_RING_MEM_MAP
segs = MVXPE_TX_RING_MEM_MAP(sc, q)->dm_segs;
nsegs = MVXPE_TX_RING_MEM_MAP(sc, q)->dm_nsegs;
size = MVXPE_TX_RING_MEM_MAP(sc, q)->dm_mapsize;
bus_dmamap_unload(sc->sc_dmat, MVXPE_TX_RING_MEM_MAP(sc, q));
bus_dmamap_destroy(sc->sc_dmat, MVXPE_TX_RING_MEM_MAP(sc, q));
bus_dmamap_sync(sc->sc_dmat, MVXPE_TX_RING_MEM_MAP(sc, q),
bus_dmamap_sync(sc->sc_dmat, MVXPE_TX_RING_MEM_MAP(sc, q),