This bug is awaiting verification that the linux-lowlatency-
hwe-6.11/6.11.0-1007.7~24.04.1 kernel in -proposed solves the problem.
Please test the kernel and update this bug with the results. If the
problem is solved, change the tag 'verification-needed-noble-linux-
lowlatency-hwe-6.11' to 'verification-done-noble-linux-lowlatency-
hwe-6.11'. If the problem still exists, change the tag 'verification-
needed-noble-linux-lowlatency-hwe-6.11' to 'verification-failed-noble-
linux-lowlatency-hwe-6.11'.


If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.


See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: kernel-spammed-noble-linux-lowlatency-hwe-6.11-v2 
verification-needed-noble-linux-lowlatency-hwe-6.11

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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to iproute2 in Ubuntu.
https://bugs.launchpad.net/bugs/2064508

Title:
  re-enable Ubuntu FAN in the Noble kernel

Status in iproute2 package in Ubuntu:
  Fix Released
Status in linux package in Ubuntu:
  Invalid
Status in iproute2 source package in Noble:
  Invalid
Status in linux source package in Noble:
  Fix Released
Status in iproute2 source package in Oracular:
  Fix Released
Status in linux source package in Oracular:
  Fix Released

Bug description:
  [Impact]

  In LP: #2063298, we have opted to deprecate Ubuntu FAN support because
  of the maintenance overhead and the possibility of regressions /
  conflicts with the new networking eBPF APIs in kernels >= 6.8.

  However, we cannot disable this feature in HWE/backport kernels, so it
  seems safer to adjust the Ubuntu FAN kernel patch set to ensure proper
  co-existence with the updated vxlan policy requirements in newer 6.8
  kernels.

  The re-introduction of Ubuntu FAN should be considered as a temporary
  measure, aimed at facilitating a smooth transition during its
  deprecation without disrupting existing users (specifically Juju), and
  enabling the backporting of 6.8 kernels to older releases.

  The main plan is still to deprecate Ubuntu FAN at some point in the
  future.

  [Test case]

  Rely on the specific Ubuntu FAN regression test to validate the proper
  kernel support of this feature:

  https://git.launchpad.net/~canonical-kernel-team/+git/autotest-client-
  tests/tree/ubuntu_fan_smoke_test?h=autotest3

  [Fix]

  Re-apply the Ubuntu FAN patch set to the latest Noble kernel 6.8 and
  integrate the IFLA_VXLAN_FAN_MAP attribute type in vxlan_policy to
  satisfy the strict length validation check.

  [Regression potential]

  We may experience regressions with eBPF vxlan capabilities and
  potentially specific use cases of the Ubuntu FAN technology (Juju
  installations).

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