openvswitch: add Ethernet push and pop actions
It's not allowed to push Ethernet header in front of another Ethernet header. It's not allowed to pop Ethernet header if there's a vlan tag. This preserves the invariant that L3 packet never has a vlan tag. Based on previous versions by Lorand Jakab and Simon Horman. Signed-off-by: NLorand Jakab <lojakab@cisco.com> Signed-off-by: NSimon Horman <simon.horman@netronome.com> Signed-off-by: NJiri Benc <jbenc@redhat.com> Acked-by: NPravin B Shelar <pshelar@ovn.org> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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