@moshele I have re-tested without dvr-snat and these are the results:

(agent_mode=dvr, offload=true, explicitly_egress_direct=False):

  switchdev port:
    ping between vms same network/separate hypervisors: pass
    ping network gateway: fail
    ping external address: pass

  normal port:
    ping between vms same network/separate hypervisors: pass
    ping network gateway: fail
    ping external address: pass


Results (agent_mode=dvr, offload=true, explicitly_egress_direct=False, 1897637 
patch reverted):

  switchdev port:
    ping between vms same network/separate hypervisors: pass
    ping network gateway: pass
    ping external address: pass

  normal port:
    ping between vms same network/separate hypervisors: pass
    ping network gateway: pass
    ping external address: pass

So as you can see, with your patch in a dvr env (computenode=dvr,
networknode=dvr_snat) that has offload enabled, I am unable to ping my
network gateway. I assume this is an unintended side-effect of your
patch since it does not exist if i remove your patch.

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https://bugs.launchpad.net/bugs/1931696

Title:
  ovs offload broken from neutron 16.3.0 onwards

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