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[OpenStack Infra <2101140@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.opendev.org/c/openstack/neutron/+/943404
Committed: https://opendev.org/openstack/neutron/commit/1c953a0bcc0ddce0580055b89e006589bc92ff4a
Submitter: "Zuul (22348)"
Branch:    master

commit 1c953a0bcc0ddce0580055b89e006589bc92ff4a
Author: Rodolfo Alonso Hernandez <ralonsoh@xxxxxxxxxx>
Date:   Mon Mar 3 16:52:23 2025 +0000

    [OVN] Make the Logical_Switch_Port UP event more robust
    
    In ML2/OVN it is possible that the OVN databases are configured in a
    OVSDB RAFT cluster. If by any circumstance the RAFT leader changes, the
    active IDL connections to OVN NB and SB databases will temporarily
    disconnect and reconnect again. During this time gap, if the
    ``LogicalSwitchPortUpdateUpEvent`` arrives, it won't be processed.
    
    This patch keeps the ``LogicalSwitchPortCreateEvent`` in the watch list.
    Now if the IDL reconnects, all Logical_Switch_Port registers will be
    received as CREATE events. If a ``LogicalSwitchPortUpdateUpEvent`` was
    missed, now it will be processed.
    
    Closes-Bug: #2101140
    Change-Id: Ie303ec230c1b0510d41289ad17ca3d3a48d7b144


** Changed in: neutron
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/2101140

Title:
  [OVN] Make LSP up/down events processing resilient to IDL
  disconnections

Status in neutron:
  Fix Released

Bug description:
  The port binding phase is part of the VM spawning process. Regardless
  of the backend used (ML2/OVN, ML2/OVS), it needs to detect the port
  created and inform to the Neutron API. At this point, the Neutron API
  will consider the port as UP and will inform to Nova (vif-plugged-
  event); Nova will send the port binding request after this event.

  In ML2/OVN it is possible that the OVN databases are configured in a
  OVSDB RAFT cluster. If by any circumstance the RAFT leader changes,
  the active IDL connections to OVN NB and SB databases will temporarily
  disconnect and reconnect again. During this time gap, if the
  ``LogicalSwitchPortUpdateUpEvent`` arrives, it won't be processed.

  When the IDL reconnects, it will send all the registers tagged as
  CREATED, including the missed Logical_Switch_Port event setting to UP
  this port.

  The goal of this bug is to make this event resilient to IDL
  disconnections and prevent timeouts during a VM creation.

  [1]https://docs.ovn.org/en/latest/tutorials/ovn-ovsdb-relay.html

  Jira reference: https://issues.redhat.com/browse/OSPRH-14377

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