neutron don't support Router gateway rate limit

[zhang ping]

Refer to this patch(Apply QoS policy on network:router_gateway :https://review.openstack.org/#/c/425218/),I apply qos policy to router gateway port.
Execution command：
ovs-vsctl list interface qg-xxxx
I find that the ingress rate limit of qg port has been configured successfully,but I found this rate limit didn't work by using iperf test.By view the openvswitch log,i find error:
-----------------------------------------------------------------------------------
2017-11-16T01:22:55.598Z|00115|netdev_linux|INFO|ioctl(SIOCGIFHWADDR) on qg-d0c7278b-d2 device failed: No such device
2017-11-16T01:22:55.604Z|00116|netdev_linux|WARN|ioctl(SIOCGIFINDEX) on qg-d0c7278b-d2 device failed: No such device
2017-11-16T01:22:55.604Z|00117|netdev_linux|WARN|qg-d0c7278b-d2: removing policing failed: No such device
----------------------------------------------------------------------------------
 I think openvswitch don't support police rate of namespace qg port, so neutron don't support Router gateway rate limit.

[Slawek Kaplonski (slaweq)]

So I checked it on my devstack and it looks like in default config L3 agent is using "internal" ovs ports. Problem is that traffic shaping on "internal" ports don't work properly.
When I changed option "ovs_use_veth" to True then ingress bw limit worked as expected.
I will continue checking that.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/523153

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/523153
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=d835dd2093083ebb9e5e8ba6b7d30096fb0ed2cd
Submitter: Zuul
Branch: master

commit d835dd2093083ebb9e5e8ba6b7d30096fb0ed2cd
Author: Sławek Kapłoński <email address hidden>
Date: Mon Nov 27 15:29:41 2017 +0000

    [QoS] Add info about rate limiting on router's ports

    Qos policy with bandwidth limit rules can be applied on router's
    gateway ports to limit only if veth are used to connect it to
    namespaces.
    This commit updates "ovs_use_veth" config option help message and
    qos docs to add such info there.

    Change-Id: I69e78bc125d430c933f7576d05308030789cee0a
    Related-Bug: #1732852

[LIU Yulong (dragon889)]

bug#1757044 will handle the router gateway IP qos.

[Slawek Kaplonski (slaweq)]

Let's continue work on this issue in bug #1757044 as it is related to the same issue