RING_BACKWARD
sc->sc_rx_cur, RING_BACKWARD(sc->sc_rx_cur, 1, IPW2100_NUM_RXBD)));
RING_BACKWARD(sc->sc_rx_cur, 1, IPW2100_NUM_RXBD));
RING_BACKWARD(sc->sc_rx_cur, 1, IPW2100_NUM_RXBD));
RING_BACKWARD(sc->sc_rx_cur, 1, IPW2200_RX_RING_SIZE));
RING_BACKWARD(sc->sc_rx_cur, 1,