How to use the ethtool.get_ufo function in ethtool

def show_offload(interface, args = None):
        try:
                sg = ethtool.get_sg(interface) and "on" or "off"
        except IOError:
                sg = "not supported"

        try:
                tso = ethtool.get_tso(interface) and "on" or "off"
        except IOError:
                tso = "not supported"

        try:
                ufo = ethtool.get_ufo(interface) and "on" or "off"
        except IOError:
                ufo = "not supported"

        try:
                gso = ethtool.get_gso(interface) and "on" or "off"
        except IOError:
                gso = "not supported"

        printtab("scatter-gather: %s" % sg)
        printtab("tcp segmentation offload: %s" % tso)
        printtab("udp fragmentation offload: %s" % ufo)
        printtab("generic segmentation offload: %s" % gso)