WX_FLAG_VLAN_PROMISC
clear_bit(WX_FLAG_VLAN_PROMISC, wx->flags);
if (test_bit(WX_FLAG_VLAN_PROMISC, wx->flags))
set_bit(WX_FLAG_VLAN_PROMISC, wx->flags);
if (!test_bit(WX_FLAG_VLAN_PROMISC, wx->flags))
clear_bit(WX_FLAG_VLAN_PROMISC, wx->flags);