/* If ethertype is already set and is not VLAN (0x8100) or
* QINQ(0x88A8), then don't proceed further. Otherwise,
* reset the outer ethertype, so that it can be replaced by
/* If ethertype is already set and is not VLAN (0x8100) or
* QINQ(0x88A8), then don't proceed further. Otherwise,
* reset the outer ethertype, so that it can be replaced by