> However, I don't see how we can argue that dropping FAN support is
> *not* a regression, even if the kernel we ship does not support it.

I understand.

I guess the situation is a bit particular here. If the official kernel
doesn't support it -- something Ubuntu-specific, not upstreamed -- it
means Ubuntu FAN cannot be used: there is no way to even validate that
these patches work on Ubuntu 24.04. The regression would be more on the
kernel side :)

>> and dropping these patches would stop the diversion with Debian?
>
> That's not a goal of our SRU process. We can always realign with
> Debian during the next devel cycle.

Good point. I just wanted to suggest that dropping these patches could
be seen as a "safer approach" as it is closer to the upstream version,
what is on Debian and other distributions.

> The package does seem to include this in its autopkgtests
> (debian/tests/testsuite.sh), so I think we have that coverage.

Oh, I missed that, thank you for having checked! Good news then!

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Matching subscriptions: iproute2
https://bugs.launchpad.net/bugs/2051672

Title:
  [FFe] Merge iproute2 with the latest Debian version: 6.8.0-1 from
  testing/unstable (main)

Status in iproute2 package in Ubuntu:
  Incomplete

Bug description:
  iproute2 upstream produces releases coinciding with upstream kernel
  releases to support the latest kernel features. Noble's iproute2 is
  still back at v6.1 even though it will use the v6.8 kernel. This means
  we provide no userspace interface for newer features - some of which
  are noted by a networking hardware partner in bug 2060969.

  Ubuntu's iproute2 has diverged from Debian's to add support for Ubuntu
  FAN. Noble has dropped kernel support for Ubuntu FAN, so those are no
  longer needed, and we could now just do a merge. We could also port
  the FAN patches forward if we can identify a need (see the original
  description of this bug to a link to such a port), but I have not done
  any testing with that.

  I have built Debian's iproute2 in a noble ppa at ppa:dannf/test and
  smoke tested it on an amd64 virtual machine:

  ubuntu@cortez-vm-0:~$ sudo dpkg -i iproute2_6.8.0-1~24.04.1_amd64.deb
  (Reading database ... 83134 files and directories currently installed.)
  Preparing to unpack iproute2_6.8.0-1~24.04.1_amd64.deb ...
  Unpacking iproute2 (6.8.0-1~24.04.1) over (6.1.0-1ubuntu6) ...
  dpkg: warning: unable to delete old directory '/etc/iproute2/rt_tables.d': 
Directory not empty
  dpkg: warning: unable to delete old directory '/etc/iproute2/rt_protos.d': 
Directory not empty
  dpkg: warning: unable to delete old directory '/etc/iproute2': Directory not 
empty
  Setting up iproute2 (6.8.0-1~24.04.1) ...
  Removing obsolete conffile /etc/iproute2/group ...
  Removing obsolete conffile /etc/iproute2/rt_realms ...
  Removing obsolete conffile /etc/iproute2/rt_scopes ...
  Removing obsolete conffile /etc/iproute2/rt_tables ...
  Removing obsolete conffile /etc/iproute2/rt_tables.d/README ...
  Removing obsolete conffile /etc/iproute2/rt_protos.d/README ...
  Removing obsolete conffile /etc/iproute2/rt_protos ...
  Removing obsolete conffile /etc/iproute2/rt_dsfield ...
  Removing obsolete conffile /etc/iproute2/nl_protos ...
  Removing obsolete conffile /etc/iproute2/ematch_map ...
  Removing obsolete conffile /etc/iproute2/bpf_pinning ...
  Processing triggers for man-db (2.12.0-4build1) ...

  The system rebooted fine. The ip command seems to behave normally.

  Since the upstream test suite only appears to run at autopkgtest time, I 
triggered a run in my PPA, and it passed:
    
https://autopkgtest.ubuntu.com/results/autopkgtest-noble-dannf-test/noble/amd64/i/iproute2/20240412_210819_97417@/log.gz

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