Comment 20 for bug 1964940

Reviewed: https://review.opendev.org/c/openstack/neutron/+/843426
Committed: https://opendev.org/openstack/neutron/commit/e6d27be4747eb4573dcc5c0e1e7ac7550d20f951
Submitter: "Zuul (22348)"
Branch: master

commit e6d27be4747eb4573dcc5c0e1e7ac7550d20f951
Author: yatinkarel <email address hidden>
Date: Thu May 26 14:57:48 2022 +0530

    Revert "Use Port_Binding up column to set Neutron port status"

    This reverts commit 37d4195b516f12b683b774f0561561b172dd15c6.
    Conflicts:
            neutron/common/ovn/constants.py
            neutron/plugins/ml2/drivers/ovn/mech_driver/ovsdb/ovsdb_monitor.py

    Also revert below 2 commits which were added on
    top of the parent commit:-

    Revert "Ensure subports transition to DOWN"
    This reverts commit 5e036a6b281e4331f396473e299b26b2537d5322.

    Revert "Ensure only the right events are processed"
    This reverts commit 553f462656c2b7ee1e9be6b1e4e7c446c12cc9aa.

    Reason for revert: These patches have caused couple of issues[1][2][3].
    [1][2] are same issue just one is seen in c8/c9-stream and other in
    rhel8 and both contains much info about the issue.
    [3] is currently happening only in rhel8/rhel9 as this issue is visible
    only with the patch in revert and ovn-2021>=21.12.0-55(fix of [4]) which
    is not yet available in c8/c9-stream.

    [1][2] happens randomly as the patch under revert has moved the
    events to SB DB which made a known OVN issue[5] occur more often as in
    that issue SB DB Event queue floods with too many events of
    PortBindingChassisEvent making other events like PortBindingUpdateUpEvent
    to wait much longer and hence triggering VirtualInterfaceCreateException.

    NB DB Event queue is different and hence with revert we are trying to
    lower the side effect of the OVN issue[5].

    This patch can be re reverted once [3] and [5] are fixed.

    [1] https://bugs.launchpad.net/tripleo/+bug/1964940/
    [2] https://bugzilla.redhat.com/show_bug.cgi?id=2081631
    [3] https://bugzilla.redhat.com/show_bug.cgi?id=2090604
    [4] https://bugzilla.redhat.com/show_bug.cgi?id=2037433
    [5] https://bugzilla.redhat.com/show_bug.cgi?id=1974898

    Closes-Bug: #1964940
    Closes-Bug: rhbz#2081631
    Closes-Bug: rhbz#2090604
    Related-Bug: rhbz#2037433
    Related-Bug: rhbz#1974898
    Change-Id: I159460be27f2c5f105be4b2865ef84aeb9a00094