Comment 27 for bug 1456073

Reviewed: https://review.openstack.org/275073
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=55f3d476a12dce8a70d3e485f0f2f9c752cf0b3d
Submitter: Jenkins
Branch: master

commit 55f3d476a12dce8a70d3e485f0f2f9c752cf0b3d
Author: Swaminathan Vasudevan <email address hidden>
Date: Tue Feb 2 00:35:24 2016 -0800

    Implement setup_networks_on_host for Neutron networks

    setup_networks_on_host has not been implemented for
    neutron networks and only implemented for nova net.

    In order to address the L3 network issues related to the
    live-migration in neutron, 'setup_networks_on_host' should
    be implemented in the neutronv2/api.

    This patch implements the function and updates the portbinding
    profile dictionary with the 'migrating_to' key pointing to the
    destination host in pre-live migration phase.

    port:{'binding:profile':{'migrating_to': 'host'}}

    When migrate_instance_finish() is called, it should clear
    the migration profile before binding the host to the destination
    port to prevent neutron from taking any action when the port-update
    happens after the port migrates.

    Based on the port profile update with the destination host,
    the neutron will be able to create any associated L3 networks
    on the destination host.

    Further work is planned to issue a status update notification
    to nova during the pre-live migration phase after the
    L3 networks have been created on the destination host and
    before the port lands on the destination host. This will
    be addressed in a different patch, since we don't have such
    wait state in nova at this time.

    The neutron side changes are handled in different patch sets shown
    below [1] server side and [2] agent side.

    [1] https://review.openstack.org/#/c/275420/
    [2] https://review.openstack.org/#/c/260738/

    NOTE: Older versions of neutron may ignore the new port binding
    migrating profile information.

    Change-Id: Ib1cc44bf9d01baf4d1f1d26c2a368a5ca7c6ab68
    Partial-Bug: #1456073