CGEM_RXDESC_WRAP
sc->rxring[CGEM_NUM_RX_DESCS - 1].addr |= CGEM_RXDESC_WRAP;
rx_desc->addr = CGEM_RXDESC_OWN | CGEM_RXDESC_WRAP;
sc->rxring[CGEM_NUM_RX_DESCS - 1].addr |= CGEM_RXDESC_WRAP;
CGEM_RXDESC_WRAP;