8b9bb988f7
Check if it has already been vlan-tagged packet, if true, avoid inserting a duplicated vlan tag into it. This is a possible case when guest has the capability of inserting vlan tag. Signed-off-by: Changchun Ouyang <changchun.ouyang@intel.com> Acked-by: Huawei Xie <huawei.xie@intel.com>