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[Jacy Lee <1920700@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

When OVS restart and executed here (https://github.com/openstack/neutron/blob/80dfbb03715ff3b8ee06f698df4bfa95d285b0e5/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py#L2579), some flows will be missing in the br-int, as follows:
 * table=60, n_packets=230017, n_bytes=25281846, priority=4,in_port="int-br-floating" actions=resubmit(,61)
 * table=60, n_packets=23697, n_bytes=1230474, priority=4,in_port="patch-tun" actions=resubmit(,61)
 * table=61, n_packets=2713148, n_bytes=800997718, priority=0 actions=resubmit(,62)

These flows are initialized in the function
install_ingress_direct_goto_flows(), and this function is only called in
the constructor of the class OVSNeutronAgent. So when ovs_status equals
constants.OVS_RESTARTED and flows need to be regenerated, but this
function is not called and these flows are not regenerated.

In order to solve this problem, we need to additionally restart ovs-
neutron-agent to call install_ingress_direct_goto_flows() to regenerate
these flows.

** Affects: neutron
     Importance: Undecided
         Status: New


** Tags: ovs

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https://bugs.launchpad.net/bugs/1920700

Title:
  When OVS  restart, some flows  will be missing in the br-int

Status in neutron:
  New

Bug description:
  When OVS restart and executed here (https://github.com/openstack/neutron/blob/80dfbb03715ff3b8ee06f698df4bfa95d285b0e5/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py#L2579), some flows will be missing in the br-int, as follows:
   * table=60, n_packets=230017, n_bytes=25281846, priority=4,in_port="int-br-floating" actions=resubmit(,61)
   * table=60, n_packets=23697, n_bytes=1230474, priority=4,in_port="patch-tun" actions=resubmit(,61)
   * table=61, n_packets=2713148, n_bytes=800997718, priority=0 actions=resubmit(,62)

  These flows are initialized in the function
  install_ingress_direct_goto_flows(), and this function is only called
  in the constructor of the class OVSNeutronAgent. So when ovs_status
  equals constants.OVS_RESTARTED and flows need to be regenerated, but
  this function is not called and these flows are not regenerated.

  In order to solve this problem, we need to additionally restart ovs-
  neutron-agent to call install_ingress_direct_goto_flows() to
  regenerate these flows.

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