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[Nguyen Thanh Cong <1864630@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

I have a VM with multiple ports, assume port_one and port_two. Both port
have QoS. When i hard reboot my VM, port_two still has QoS, port_one
loses.

https://review.opendev.org/#/c/690098/11
https://github.com/openstack/neutron/blob/master/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py#L1630
It because both ports are located in ports_re_added. It will loop through the ports. port_one is iterated first, events ['re_added'] is assigned port_one, events ['removed'] is assigned port_two. In the second loop, events ['re_added'] is set to port_two instead of adding port_two to list. So after the loop, only port_two is left in events ['re_added'].

Reproduce:
- Create VM with multi port
- Hard Reboot Server
- Check QoS with command ovs-vsctl list interface <port>

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1864630

Title:
  Hard Reboot VM with multiple port lost QoS

Status in neutron:
  New

Bug description:
  I have a VM with multiple ports, assume port_one and port_two. Both
  port have QoS. When i hard reboot my VM, port_two still has QoS,
  port_one loses.

  https://review.opendev.org/#/c/690098/11
  https://github.com/openstack/neutron/blob/master/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py#L1630
  It because both ports are located in ports_re_added. It will loop through the ports. port_one is iterated first, events ['re_added'] is assigned port_one, events ['removed'] is assigned port_two. In the second loop, events ['re_added'] is set to port_two instead of adding port_two to list. So after the loop, only port_two is left in events ['re_added'].

  Reproduce:
  - Create VM with multi port
  - Hard Reboot Server
  - Check QoS with command ovs-vsctl list interface <port>

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