[Bug 1742505] Re: gre_sys set to default 1472 when using path_mtu > 1500 with ovs 2.8.x

[James Page]

** Changed in: cloud-archive/queens
   Status: Fix Committed => Fix Released

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Title:
  gre_sys set to default 1472 when using path_mtu > 1500 with ovs 2.8.x

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[Bug 1742505] Re: gre_sys set to default 1472 when using path_mtu > 1500 with ovs 2.8.x

[James Page]

This bug was fixed in the package openvswitch - 2.8.1-0ubuntu0.17.10.2~cloud0
---

 openvswitch (2.8.1-0ubuntu0.17.10.2~cloud0) xenial-pike; urgency=medium
 .
   * New update for the Ubuntu Cloud Archive.
 .
 openvswitch (2.8.1-0ubuntu0.17.10.2) artful; urgency=medium
 .
   * d/p/dpif-kernel-gre-mtu-workaround.patch,
 d/p/dpif-netlink-rtnl-Use-65000-instead-of-65535-as-tunnel-MTU.patch:
 Cherry pick in-flight fixes for workaround to correctly set MTU
 of GRE devices via netlink (LP: #1742505).


** Changed in: cloud-archive/pike
   Status: Fix Committed => Fix Released

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Title:
  gre_sys set to default 1472 when using path_mtu > 1500 with ovs 2.8.x

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[Bug 1742505] Re: gre_sys set to default 1472 when using path_mtu > 1500 with ovs 2.8.x

[Launchpad Bug Tracker]

This bug was fixed in the package openvswitch - 2.8.1-0ubuntu0.17.10.2

---
openvswitch (2.8.1-0ubuntu0.17.10.2) artful; urgency=medium

  * d/p/dpif-kernel-gre-mtu-workaround.patch,
d/p/dpif-netlink-rtnl-Use-65000-instead-of-65535-as-tunnel-MTU.patch:
Cherry pick in-flight fixes for workaround to correctly set MTU
of GRE devices via netlink (LP: #1742505).

openvswitch (2.8.1-0ubuntu0.17.10.1) artful; urgency=medium

  * New upstream stable release (LP: #1724622).

 -- James Page   Sat, 20 Jan 2018 10:22:31 +

** Changed in: openvswitch (Ubuntu Artful)
   Status: Fix Committed => Fix Released

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  gre_sys set to default 1472 when using path_mtu > 1500 with ovs 2.8.x

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[Bug 1742505] Re: gre_sys set to default 1472 when using path_mtu > 1500 with ovs 2.8.x

[James Page]

successfully tested with bug 1743746

** Tags removed: verification-needed-artful verification-queens-needed
** Tags added: verification-done-artful verification-queens-done

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  gre_sys set to default 1472 when using path_mtu > 1500 with ovs 2.8.x

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[Bug 1742505] Re: gre_sys set to default 1472 when using path_mtu > 1500 with ovs 2.8.x

[Launchpad Bug Tracker]

This bug was fixed in the package openvswitch - 2.8.1-0ubuntu3

---
openvswitch (2.8.1-0ubuntu3) bionic; urgency=medium

  * Updates to systemd configuration:
- Move to distinct units for ovsdb-server and ovs-vswitchd.
  * Drop obsolete upstart configuration file.
  * Bump nofiles to 1048576 for ovs daemons (LP: #1737866).
  * d/control: Bump minimum debhelper version to 10, drop BD on
dh-systemd.
  * d/p/dpif-kernel-gre-mtu-workaround.patch,
d/p/dpif-netlink-rtnl-Use-65000-instead-of-65535-as-tunnel-MTU.patch:
Cherry pick in-flight fixes for workaround to correctly set MTU
of GRE devices via netlink (LP: #1742505).

 -- James Page   Thu, 18 Jan 2018 15:26:41 +0200

** Changed in: openvswitch (Ubuntu Bionic)
   Status: In Progress => Fix Released

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Title:
  gre_sys set to default 1472 when using path_mtu > 1500 with ovs 2.8.x

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[Bug 1742505] Re: gre_sys set to default 1472 when using path_mtu > 1500 with ovs 2.8.x

[James Page]

Tested OK on Xenial with Pike UCA:

16: gre_sys@NONE:  mtu 65000 qdisc pfifo_fast 
master ovs-system state UNKNOWN mode DEFAULT group default qlen 1000
link/ether 56:5c:6e:19:f5:4b brd ff:ff:ff:ff:ff:ff


However testing on artful currently blocked pending resolution of bug 1743746 
which prevents an increase in the MTU of the gre devices.

** Tags removed: verification-pike-needed
** Tags added: verification-pike-done

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Title:
  gre_sys set to default 1472 when using path_mtu > 1500 with ovs 2.8.x

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[Bug 1742505] Re: gre_sys set to default 1472 when using path_mtu > 1500 with ovs 2.8.x

[Brian Murray]

Hello David, or anyone else affected,

Accepted openvswitch into artful-proposed. The package will build now
and be available at
https://launchpad.net/ubuntu/+source/openvswitch/2.8.1-0ubuntu0.17.10.2
in a few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested and change the tag from
verification-needed-artful to verification-done-artful. If it does not
fix the bug for you, please add a comment stating that, and change the
tag to verification-failed-artful. In either case, without details of
your testing we will not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

** Changed in: openvswitch (Ubuntu Artful)
   Status: In Progress => Fix Committed

** Tags added: verification-needed verification-needed-artful

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Title:
  gre_sys set to default 1472 when using path_mtu > 1500 with ovs 2.8.x

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[Bug 1742505] Re: gre_sys set to default 1472 when using path_mtu > 1500 with ovs 2.8.x

[Jason Hobbs]

@james-page When will the 2.8.1 release be?

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Title:
  gre_sys set to default 1472 when using path_mtu > 1500 with ovs 2.8.x

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[Bug 1742505] Re: gre_sys set to default 1472 when using path_mtu > 1500 with ovs 2.8.x

[James Page]

I've uploaded the fixes for this issue to bionic (currently in proposed
awaiting builds across all archs) and for artful (stacked ontop of the
current 2.8.1 stable release in proposed).

I'd like todo this fix ontop of the 2.8.1 release, rather than have end-
users deal with two sets of updates which are disruptive to the data
plane in an openstack cloud.

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  gre_sys set to default 1472 when using path_mtu > 1500 with ovs 2.8.x

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[Bug 1742505] Re: gre_sys set to default 1472 when using path_mtu > 1500 with ovs 2.8.x

[James Page]

Leaving the kernel bug tasks open for now; there is an underlying issue
in the kernel specific to GRE tunnel ports where the MTU passed during
new device creation is not being used; the fixes to OVS workaround this
issue rather than actually resolving it.

** Description changed:

+ [Impact]
+ OpenStack Clouds using GRE overlay tunnels with > 1500 MTU's will observe 
packet fragmentation/networking issues for traffic in overlay networks.
+ 
+ [Test Case]
+ Deploy OpenStack Pike (xenial + pike UCA or artful)
+ Create tenant networks using GRE segmentation
+ Boot instances
+ Instance networking will be broken/slow
+ 
+ gre_sys devices will be set to mtu=1472 on hypervisor hosts.
+ 
+ [Regression Potential]
+ Minimal; the fix to OVS works around an issue for GRE tunnel port setup via 
rtnetlink by performing a second request once the gre device is setup to set 
the MTU to a high value (65000).
+ 
+ 
+ [Original Bug Report]
  Setup:
  Pike neutron 11.0.2-0ubuntu1.1~cloud0
  OVS 2.8.0
  Jumbo frames setttings per: 
https://docs.openstack.org/mitaka/networking-guide/config-mtu.html
  global_physnet_mtu = 9000
  path_mtu = 9000
  
  Symptoms:
  gre_sys MTU is 1472
  Instances with MTUs > 1500 fail to communicate across GRE
  
  Temporary Workaround:
  ifconfig gre_sys MTU 9000
  Note: When ovs rebuilds tunnels, such as on a restart, gre_sys MTU is set 
back to default 1472.
  
  Note: downgrading from OVS 2.8.0 to 2.6.1 resolves the issue.
  
  Previous behavior:
  With Ocata or Pike and OVS 2.6.x
  gre_sys MTU defaults to 65490
  It remains at 65490 through restarts.
  
  This may be related to some combination of the following changes in OVS which 
seem to imply MTUs must be set in the ovs database for tunnel interfaces and 
patches:
  
https://github.com/openvswitch/ovs/commit/8c319e8b73032e06c7dd1832b3b31f8a1189dcd1
  
https://github.com/openvswitch/ovs/commit/3a414a0a4f1901ba015ec80b917b9fb206f3c74f
  
https://github.com/openvswitch/ovs/blob/6355db7f447c8e83efbd4971cca9265f5e0c8531/datapath/vport-internal_dev.c#L186

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  gre_sys set to default 1472 when using path_mtu > 1500 with ovs 2.8.x

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[Bug 1742505] Re: gre_sys set to default 1472 when using path_mtu > 1500 with ovs 2.8.x

[James Page]

Test packages for Artful and Xenial in:

  ppa:james-page/pike

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[Bug 1742505] Re: gre_sys set to default 1472 when using path_mtu > 1500 with ovs 2.8.x

[James Page]

I've re-tested with the proposed changes upstream; MTU is correctly set
to 65000 for all tunnel types including GRE on 4.4 kernels; the kernel
fix for bug 1743746 is required for support on >= Artful or if the HWE
edge kernel is in use on Xenial.

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  gre_sys set to default 1472 when using path_mtu > 1500 with ovs 2.8.x

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[Bug 1742505] Re: gre_sys set to default 1472 when using path_mtu > 1500 with ovs 2.8.x

[James Page]

Reference bug 1743746 for MTU hardware limitation in 4.13 kernel

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  gre_sys set to default 1472 when using path_mtu > 1500 with ovs 2.8.x

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[Bug 1742505] Re: gre_sys set to default 1472 when using path_mtu > 1500 with ovs 2.8.x

[James Page]

Simple reproducer:

sudo add-apt-repository cloud-archive:pike
sudo apt update
sudo apt install openvswitch-switch
sudo ovs-vsctl add-br br-tun
sudo ovs-vsctl add-port br-tun gre0 -- set interface gre0 type=gre 
options:remote_ip=10.100.1.1

this will cause ovs to create the gre_sys device in the kernel; the
remote_ip can be anything but is obviously not functional.

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[Bug 1742505] Re: gre_sys set to default 1472 when using path_mtu > 1500 with ovs 2.8.x

[James Page]

ovs-dev ML thread:

https://mail.openvswitch.org/pipermail/ovs-dev/2018-January/343069.html

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  gre_sys set to default 1472 when using path_mtu > 1500 with ovs 2.8.x

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[Bug 1742505] Re: gre_sys set to default 1472 when using path_mtu > 1500 with ovs 2.8.x

[James Page]

Marking kernel tasks as confirmed as we have at least one related bug
which we have confirmed is fixed under 4.15 (and looks like an easy pick
for 4.13).

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Title:
  gre_sys set to default 1472 when using path_mtu > 1500 with ovs 2.8.x

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[Bug 1742505] Re: gre_sys set to default 1472 when using path_mtu > 1500 with ovs 2.8.x

[James Page]

Mirroring some of the thread on the ovs dev ML:

>From Christina

"Thanks Eric, that matches my findings, glad that there seems to be an
accepted fix already.
But it is fairly recent and only in since 4.15-rc8 levels afaik.

But OTOH its description at [1] reads pretty much like my notes so far.

@James - do you think you could test a super-recent mainline kernel
build from [2] in regard to this issue?

[1]: 
https://github.com/torvalds/linux/commit/cfddd4c33c254954927942599d299b3865743146
[2]: http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.15-rc8/;

This kernel fix resolves a secondary issue I saw with the 4.13 kernel
where the workaround we used for 4.4 did not work - the kernel was
applying a 1500 max limit to all GRE devices.

This was fixed in [1] which I've confirmed on my test but the original
OVS bug still exists - gre_sys is still configured with MTU 1472,
implying the IFLA_MTU value provided via netlink is being ignored by the
kernel.


** Changed in: linux (Ubuntu Artful)
   Status: Incomplete => Confirmed

** Changed in: linux (Ubuntu Bionic)
   Status: Incomplete => Confirmed

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[Bug 1742505] Re: gre_sys set to default 1472 when using path_mtu > 1500 with ovs 2.8.x

[James Page]

** Also affects: linux (Ubuntu)
   Importance: Undecided
   Status: New

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  gre_sys set to default 1472 when using path_mtu > 1500 with ovs 2.8.x

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[Bug 1742505] Re: gre_sys set to default 1472 when using path_mtu > 1500 with ovs 2.8.x

[James Page]

** Also affects: openvswitch (Ubuntu Artful)
   Importance: Undecided
   Status: New

** Also affects: openvswitch (Ubuntu Bionic)
   Importance: Critical
   Status: Confirmed

** Changed in: openvswitch (Ubuntu Artful)
 Assignee: (unassigned) => James Page (james-page)

** Changed in: openvswitch (Ubuntu Bionic)
 Assignee: (unassigned) => James Page (james-page)

** Changed in: openvswitch (Ubuntu Artful)
   Importance: Undecided => Critical

** Changed in: openvswitch (Ubuntu Artful)
   Status: New => In Progress

** Changed in: openvswitch (Ubuntu Bionic)
   Status: Confirmed => In Progress

** Also affects: cloud-archive
   Importance: Undecided
   Status: New

** Also affects: cloud-archive/queens
   Importance: Undecided
   Status: New

** Also affects: cloud-archive/pike
   Importance: Undecided
   Status: New

** Changed in: cloud-archive/pike
   Status: New => In Progress

** Changed in: cloud-archive/queens
   Status: New => In Progress

** Changed in: cloud-archive/queens
   Importance: Undecided => High

** Changed in: cloud-archive/pike
   Importance: Undecided => Critical

** Changed in: cloud-archive/pike
 Assignee: (unassigned) => James Page (james-page)

** Changed in: openvswitch (Ubuntu Bionic)
   Importance: Critical => High

** Changed in: cloud-archive/queens
 Assignee: (unassigned) => James Page (james-page)

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[Bug 1742505] Re: gre_sys set to default 1472 when using path_mtu > 1500 with ovs 2.8.x

[James Page]

Eric Garver:

"Most likely you are seeing this bug:

  https://bugzilla.redhat.com/show_bug.cgi?id=1488484

It's actually an issue with the kernel GRE driver ignoring IFLA_MTU when
the device is created."

Creating test package with proposed fix:

https://patchwork.ozlabs.org/patch/860192/

** Changed in: openvswitch (Ubuntu)
   Status: New => Confirmed

** Changed in: openvswitch (Ubuntu)
   Importance: Undecided => Critical

** Changed in: neutron
   Status: New => Invalid

** Bug watch added: Red Hat Bugzilla #1488484
   https://bugzilla.redhat.com/show_bug.cgi?id=1488484

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[Bug 1742505] Re: gre_sys set to default 1472 when using path_mtu > 1500 with ovs 2.8.x

[James Page]

Pinged upstream dev mailing list for openvswitch for feedback

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[Bug 1742505] Re: gre_sys set to default 1472 when using path_mtu > 1500 with ovs 2.8.x

[James Page]

** Also affects: openvswitch (Ubuntu)
   Importance: Undecided
   Status: New

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