RL_CUR_TXMAP
if (bus_dmamap_load_mbuf(sc->sc_dmat, RL_CUR_TXMAP(sc),
bus_dmamap_sync(sc->sc_dmat, RL_CUR_TXMAP(sc), 0,
RL_CUR_TXMAP(sc)->dm_mapsize, BUS_DMASYNC_PREWRITE);
RL_CUR_TXMAP(sc)->dm_segs[0].ds_addr);
RL_CUR_TXMAP(sc)->dm_segs[0].ds_len);