Kubernetes allows you to specify traffic constraints for pods [1]:

{{kubernetes.io/ingress-bandwidth: 10M
kubernetes.io/egress-bandwidth: 10M}}

This is a fairly standard CNI capability that we should also implement in Kuryr. It should be doable using Neutron QoS policies attached to Pod's port. Obviously we need to double-check if Neutron's QoS works fine with subports.

[1] https://docs.openshift.com/container-platform/4.10/nodes/pods/nodes-pods-configuring.html#nodes-pods-configuring-bandwidth_nodes-pods-configuring