SK_JUMBO_RX_RING_ADDR
SK_ADDR_LO(SK_JUMBO_RX_RING_ADDR(sc_if, 0)));
SK_ADDR_HI(SK_JUMBO_RX_RING_ADDR(sc_if, 0)));
addr = SK_JUMBO_RX_RING_ADDR(sc_if, 0);
addr = SK_JUMBO_RX_RING_ADDR(sc_if, i + 1);