[Bug 2119439] Re: [24.04/noble] Drop CBQ support (qdisc discipline)

[Simon Chopin]

Hi Stefan,

This looked like a straightforward upload, but then the debdiff didn't
apply. Which version did you base this on? 6.1.0-1ubuntu6.24.04.2 is
nowhere to be found in the archive AFAICT.

While you fix this, could you add some DEP-3 headers? Bug-Ubuntu fields
in particular would come in handy :)

Please resubscribe ubuntu-sponsors once you have a fixed version for us.

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https://bugs.launchpad.net/bugs/2119439

Title:
  [24.04/noble] Drop CBQ support (qdisc discipline)

Status in iproute2 package in Ubuntu:
  Invalid
Status in iproute2 source package in Noble:
  In Progress

Bug description:
  [SRU justification]

  == Impact

  The kernel dropped support for the CBQ (class based queuing) qdisc
  support in kernel version 6.3

  051d44209842 (net/sched: Retire CBQ qdisc, 2023-02-14)

  This was reflected in iproute2 upstream in v6.6.0. But noble shipped
  with v6.1.0. So the man page and help of tc still mention cbq. Any
  attempts to use it result in a failure. This also breaks the DEP-8
  tests as those attempt to make use of cbq.

  This affects only 24.04 Noble as later series already have a fixed
  iproute2 version and previous series still have CBQ support (except
  jammy:linux-hwe-6.8).

  == Fix

  Backport the upstream iproute2 patch which drops support for qbf.

  From 07ba0af3fee132eddc1c2eab643ff4910181c993 Mon Sep 17 00:00:00 2001
  From: Stephen Hemminger <stephen at networkplumber.org>
  Date: Mon, 30 Oct 2023 11:10:18 -0700
  Subject: [PATCH] tc: remove support for CBQ

  == Testing

  1. Double checking that neither "man tc" nor "tc qdisc help" mention CBQ
  2. The ADT selftests which have been accepted failing (migration/0) should
  start to work again.

  == Regression Potential

  Scripts which check the help output might react differently. However
  any attempts to set up a qdisc of type cbq should already have failed
  before.

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