Add support for fragmentation

Bug #1838405 reported by Lucas Alvares Gomes
This bug affects 1 person
Affects Status Importance Assigned to Milestone
Fix Released
Lucas Alvares Gomes

Bug Description

Core OVN now supports fragmentation (see commit message [0] for more details), networking-ovn should add supports for it.

Reported upstream at:
Reported downstream at:


Tags: rfe
Changed in networking-ovn:
assignee: nobody → Lucas Alvares Gomes (lucasagomes)
tags: added: rfe
Changed in networking-ovn:
status: New → Confirmed
importance: Undecided → Medium
Changed in networking-ovn:
status: Confirmed → In Progress
Revision history for this message
OpenStack Infra (hudson-openstack) wrote : Fix merged to networking-ovn (master)

Submitter: Zuul
Branch: master

commit d7e950002d7bcf1bbebab5cd289b59d65366492e
Author: Lucas Alvares Gomes <email address hidden>
Date: Fri Jul 19 16:22:24 2019 +0100

    OVN to emit ICMP "fragmentation needed" packets

    A new configuration option called "ovn_emit_need_to_frag" has been added
    and defaults to False. Reason being, it requires a specific kernel
    version for it to work (upstream >= 5.2). It's also possible to find out
    if OVN supports that operation by running the following command as root:

    $ ovs-appctl -t ovs-vswitchd dpif/show-dp-features br-int
    (check for "Check pkt length action: Yes").

    WARNING: Enabling this option without kernel support will result in a
    real performance degradation.

    At earlier versions of this patch we thought about having networking-ovn
    to discover if this option is supported or not (by issuing that
    ovs-appctl command above) but, since networking-ovn doesn't run in the
    network nodes we thought that an upper level tool (such as puppet-ovn or
    TripleO) could do a better job at checking for it and configuring things

    Closes-Bug: #1838405
    Change-Id: I089f95b40803a6cd5e01990acacd599ced3bbd91
    Signed-off-by: Lucas Alvares Gomes <email address hidden>

Changed in networking-ovn:
status: In Progress → Fix Released
Revision history for this message
OpenStack Infra (hudson-openstack) wrote : Fix included in openstack/networking-ovn

This issue was fixed in the openstack/networking-ovn development milestone.

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