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[Rodolfo Alonso <1788012@xxxxxxxxxxxxxxxxxx>]

Bug closed due to lack of activity, please feel free to reopen if
needed.

** Changed in: neutron
       Status: Confirmed => Won't Fix

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https://bugs.launchpad.net/bugs/1788012

Title:
  [RFE] bridge name not set in vif:binding-details by ml2/linux-bridge

Status in neutron:
  Won't Fix

Bug description:
  * Summary: bridge name not set in vif:binding-details by ml2/linux-
  bridge.

  * High level description: when ports are bound the linux bridge name should be
  populated in the vif:binding details so that it can be used by nova to during
  live migration.

  * Expected output: when a port is bound by ml2/linux-bridge the linux bridge bridge
  name is populated in vif:binding-detail and on live migation of a vm form
  ovs to linux bridge the vm is correctly plugged to the correct linux bridge.

  * Actual output:
  nova libvirt error in  virDomainMigrateToURI3 because the xml generated based
  on the destination port binding used the source bridge name since it was not
  available in the dest vif binding.

  
  ug 14 12:16:33 devstack1 nova-compute[14852]: Traceback (most recent call last):
  Aug 14 12:16:33 devstack1 nova-compute[14852]: File "/usr/lib/python2.7/site-packages/eventlet/hubs/hub.py", line 457, in fire_timers
  Aug 14 12:16:33 devstack1 nova-compute[14852]: timer()
  Aug 14 12:16:33 devstack1 nova-compute[14852]: File "/usr/lib/python2.7/site-packages/eventlet/hubs/timer.py", line 58, in __call__
  Aug 14 12:16:33 devstack1 nova-compute[14852]: cb(*args, **kw)
  Aug 14 12:16:33 devstack1 nova-compute[14852]: File "/usr/lib/python2.7/site-packages/eventlet/event.py", line 168, in _do_send
  Aug 14 12:16:33 devstack1 nova-compute[14852]: waiter.switch(result)
  Aug 14 12:16:33 devstack1 nova-compute[14852]: File "/usr/lib/python2.7/site-packages/eventlet/greenthread.py", line 214, in main
  Aug 14 12:16:33 devstack1 nova-compute[14852]: result = function(*args, **kwargs)
  Aug 14 12:16:33 devstack1 nova-compute[14852]: File "/opt/stack/nova/nova/utils.py", line 810, in context_wrapper
  Aug 14 12:16:33 devstack1 nova-compute[14852]: return func(*args, **kwargs)
  Aug 14 12:16:33 devstack1 nova-compute[14852]: File "/opt/stack/nova/nova/virt/libvirt/driver.py", line 7134, in _live_migration_operation
  Aug 14 12:16:33 devstack1 nova-compute[14852]: LOG.error("Live Migration failure: %s", e, instance=instance)
  Aug 14 12:16:33 devstack1 nova-compute[14852]: File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 220, in __exit__
  Aug 14 12:16:33 devstack1 nova-compute[14852]: self.force_reraise()
  Aug 14 12:16:33 devstack1 nova-compute[14852]: File "/usr/lib/python2.7/site-packages/oslo_utils/excutils.py", line 196, in force_reraise
  Aug 14 12:16:33 devstack1 nova-compute[14852]: six.reraise(self.type_, self.value, self.tb)
  Aug 14 12:16:33 devstack1 nova-compute[14852]: File "/opt/stack/nova/nova/virt/libvirt/driver.py", line 7127, in _live_migration_operation
  Aug 14 12:16:33 devstack1 nova-compute[14852]: bandwidth=CONF.libvirt.live_migration_bandwidth)
  Aug 14 12:16:33 devstack1 nova-compute[14852]: File "/opt/stack/nova/nova/virt/libvirt/guest.py", line 673, in migrate
  Aug 14 12:16:33 devstack1 nova-compute[14852]: destination, params=params, flags=flags)
  Aug 14 12:16:33 devstack1 nova-compute[14852]: File "/usr/lib/python2.7/site-packages/eventlet/tpool.py", line 186, in doit
  Aug 14 12:16:33 devstack1 nova-compute[14852]: result = proxy_call(self._autowrap, f, *args, **kwargs)
  Aug 14 12:16:33 devstack1 nova-compute[14852]: File "/usr/lib/python2.7/site-packages/eventlet/tpool.py", line 144, in proxy_call
  Aug 14 12:16:33 devstack1 nova-compute[14852]: rv = execute(f, *args, **kwargs)
  Aug 14 12:16:33 devstack1 nova-compute[14852]: File "/usr/lib/python2.7/site-packages/eventlet/tpool.py", line 125, in execute
  Aug 14 12:16:33 devstack1 nova-compute[14852]: six.reraise(c, e, tb)
  Aug 14 12:16:33 devstack1 nova-compute[14852]: File "/usr/lib/python2.7/site-packages/eventlet/tpool.py", line 83, in tworker
  Aug 14 12:16:33 devstack1 nova-compute[14852]: rv = meth(*args, **kwargs)
  Aug 14 12:16:33 devstack1 nova-compute[14852]: File "/usr/lib64/python2.7/site-packages/libvirt.py", line 1745, in migrateToURI3
  Aug 14 12:16:33 devstack1 nova-compute[14852]: if ret == -1: raise libvirtError ('virDomainMigrateToURI3() failed', dom=self)
  Aug 14 12:16:33 devstack1 nova-compute[14852]: libvirtError: Cannot get interface MTU on 'br-int': No such device

  during port binding the linux bridge ml2 diriver does not set the destination bridge name in the vif bindings.
  as a result when we regenerate the libvirt xml we produce the following fragment for the nic update 
             Updating guest XML with vif config: <interface type="bridge">
  Aug 14 12:15:27 devstack1 nova-compute[14852]: <mac address="fa:16:3e:a9:cf:09"/>
  Aug 14 12:15:27 devstack1 nova-compute[14852]: <model type="virtio"/>
  Aug 14 12:15:27 devstack1 nova-compute[14852]: <source bridge="br-int"/>
  Aug 14 12:15:27 devstack1 nova-compute[14852]: <mtu size="1450"/>
  Aug 14 12:15:27 devstack1 nova-compute[14852]: <target dev="tapbf69476a-25"/>
  Aug 14 12:15:27 devstack1 nova-compute[14852]: </interface>


  
  * Version:
    ** OpenStack version: Rocky RC1, neutron sha: 1dda2bca862b1268c0f5ae39b7508f1b1cab6f15, nova sha: afe4512bf66c89a061b1a7ccd3e7ac8e3b1b284d
    ** Linux distro, Centos 7.5
    ** DevStack

  * Perceived severity: low (migrating form ovs to lb is not antisipated
  to be common)

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