dm_xfer_len
esc->sc_main_dmamap->dm_xfer_len = 0;
esc->sc_tail_dmamap->dm_xfer_len = 0;
esc->sc_main_dmamap->dm_xfer_len = 0;
esc->sc_tail_dmamap->dm_xfer_len = 0;
stat->nd_map->dm_xfer_len +=
esc->sc_main_dmamap->dm_xfer_len = 0;
esc->sc_tail_dmamap->dm_xfer_len = 0;
if (map->dm_xfer_len != map->dm_mapsize) {
device_xname(sc->sc_dev), map->dm_xfer_len);
esc->sc_main_dmamap->dm_xfer_len);
esc->sc_tail_dmamap->dm_xfer_len);
esc->sc_main_dmamap->dm_xfer_len;
esc->sc_tail_dmamap->dm_xfer_len;
m->m_len = map->dm_xfer_len;
stat->nd_map_cont->dm_xfer_len = 0;
stat->nd_map->dm_xfer_len += slimit-onext;
stat->nd_map->dm_xfer_len);
stat->nd_map_cont->dm_xfer_len);