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[vpp][testbed] Disable virtio ctrl_vlan on VPP KVM DUTs #26035

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[vpp][testbed] Disable virtio ctrl_vlan on VPP KVM DUTs #26035

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14 changes: 14 additions & 0 deletions ansible/roles/vm_set/templates/sonic.xml.j2
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Original file line number Diff line number Diff line change
Expand Up @@ -133,4 +133,18 @@
{% endif %}
</devices>
<seclabel type='dynamic' model='apparmor' relabel='yes'/>
{% if asic_type == 'vpp' %}
{#
Disable the virtio-net control-VQ VLAN filter for VPP DUTs. VPP/DPDK drives the
NIC directly and never registers VLANs with the virtio control plane, so with the
qemu default (ctrl_vlan=on) qemu silently drops every VLAN-tagged frame before it
reaches VPP. That breaks any VLAN sub-interface / L3 sub-port dataplane test (e.g.
iface_loopback_action) while leaving untagged traffic working. libvirt has no
attribute for this control, so it is set via a qemu -global override.
#}
<qemu:commandline>
<qemu:arg value='-global'/>
<qemu:arg value='virtio-net-pci.ctrl_vlan=off'/>
</qemu:commandline>
{% endif %}
</domain>
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