cpsw_rxdesc_paddr
cpsw_rxdesc_paddr(sc, i));
cpsw_rxdesc_paddr(sc, sc->sc_rxhead));
cpsw_set_rxdesc_next(sc, h, cpsw_rxdesc_paddr(sc, i));
bus_space_write_4(sc->sc_bst, sc->sc_bsh, CPSW_CPDMA_RX_HDP(0), cpsw_rxdesc_paddr(sc, 0));