SIS_CMDSTS_OWN
f->sis_ctl |= htole32(SIS_CMDSTS_OWN);
sc->sis_ldata->sis_tx_list[*txidx].sis_ctl |= htole32(SIS_CMDSTS_OWN);
#define SIS_OWNDESC(x) (letoh32((x)->sis_ctl) & SIS_CMDSTS_OWN)