[ovs-discuss] Libvirt "tc ingress qdisc" automatically removed by ovs vlan tag setting, how?

[Ben Pfaff]

On Thu, Jul 18, 2013 at 12:30:19AM +0800, Qiu Yu wrote:
> On Thu, Jul 18, 2013 at 12:15 AM, Ben Pfaff <blp at nicira.com> wrote:
> > On Wed, Jul 17, 2013 at 6:06 AM, Qiu Yu <unicell at gmail.com> wrote:
> >> After some digging in openvswitch code. My wild guess is that vlan tag
> >> reconfiguring triggered iface_configure_qos (vswitchd/bridge.c), which
> >> in turn called netdev_set_policing to reset ingress policing rate.
> >> Although there's no ingress_policing_rate set in my case, existing
> >> ingress qdisc still remove by default.
> >
> > The OVS database in general specifies state, not actions.  That is, if
> > you set no ingress_policing_rate, then OVS takes that to mean that it
> > should turn off ingress policing, so it does.
> 
> I see. So ingress policing managed outside of OVS, which is libvirt in
> my case, is overridden (no ingress_policing_rate by default, means
> turned off) by OVS.
> 
> My question, however, is there any workaround, to preserve or inherit
> the ingress policing managed outside of OVS after vlan tagging the
> device?

OVS doesn't have one now.  We'd take a patch to introduce one.

"VLAN tagging the device" is a bit of a misunderstanding.  This behavior
will take place on any change to Open vSwitch configuration.  VLAN
tagging is just the one example that you have encountered.