RHEL6: QinQ (802.1ad) stacked VLAN tagging not working with SR-IOV VF devices

Solution Unverified - Updated -

Issue

  • A guest is configured internally to use one or more 802.1q vlan tags
  • The host is configured (via libvirt) to place the guest's traffic on an 802.1q vlan under another tag
  • The intention is that guest traffic appear on the physical network as QinQ / 802.1ad double tagged, with the inner tag supplied by the guest, and the outer tag supplied by the host.

  • This works as expected when the guest uses virtio-net virtual NICs which are connected to the physical network via a bridge on the host.

  • This does not work when the guest uses an SR-IOV Virtual Function of the host's NIC passed through to it.

Environment

  • Red Hat Enterprise Linux 6.5 guest
  • Red Hat Enterprise Linux 6.5 host
  • kvm based virtualization
  • Intel 82599 based SR-IOV capable NIC (ixgbe / ixgbevf driver)

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