GEM_TXD_USED
if ((status & GEM_TXD_USED) == 0)
desc64[idx].d_status |= GEM_TXD_USED;
desc32[idx].d_status |= GEM_TXD_USED;
desc64[i].d_status = GEM_TXD_USED;
desc32[i].d_status = GEM_TXD_USED;
desc64[i].d_status = GEM_TXD_USED | GEM_TXD_WRAP;
desc32[i].d_status = GEM_TXD_USED | GEM_TXD_WRAP;