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[Roxana Nicolescu <2065369@xxxxxxxxxxxxxxxxxx>]

This happens in noble too.
Commit "net: veth: do not manipulate GRO when using XDP" introduces the problem. Reverting it makes the test pass again. 
I haven't seen anything upstream related to this, I'll first understand what it does and then talk to them to solve it.

** Tags added: 6.8 noble

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https://bugs.launchpad.net/bugs/2065369

Title:
  veth.sh from ubuntu_kselftests_net failed on J-5.15 (with xdp attached
  - gro flag)

Status in ubuntu-kernel-tests:
  New

Bug description:
  Issue found with Jammy 5.15.0-111.121 in sru-20240429

  Reproduce rate is 100% across different arches on openstack cloud.

  Test log:
  ubuntu@kt-j-l-gen-5-15-bc2r4d20-u-kselftests-net-amd64:~/autotest/client/tmp/ubuntu_kselftests_net/src/linux/tools/testing/selftests/net$ sudo ./veth.sh
  default - gro flag                                           ok
          - peer gro flag                                      ok
          - tso flag                                           ok
          - peer tso flag                                      ok
          - aggregation                                        ok
          - aggregation with TSO off                           ok
  with gro on - gro flag                                       ok
          - peer gro flag                                      ok
          - tso flag                                           ok
          - peer tso flag                                      ok
          - aggregation with TSO off                           ok
  default channels                                             ok
  with gro enabled on link down - gro flag                     ok
          - peer gro flag                                      ok
          - tso flag                                           ok
          - peer tso flag                                      ok
          - aggregation with TSO off                           ok
  setting tx channels                                          ok
  bad setting: combined channels                               ok
  setting invalid channels nr                                  ok
  bad setting: XDP with RX nr less than TX                     ok
  bad setting: reducing RX nr below peer TX with XDP set       ok
  with xdp attached - gro flag                                 fail - expected on found off
          - peer gro flag                                      ok
          - tso flag                                           ok
          - peer tso flag                                      ok
          - aggregation                                        fail - got 10 packets, expected 1
          - after dev off, flag                                fail - expected on found off
          - peer flag                                          ok
          - after gro on xdp off, gro flag                     ok
          - peer gro flag                                      ok
          - tso flag                                           ok
          - peer tso flag                                      ok
  decreasing tx channels with device down                      ok
          - aggregation                                        ok
  increasing tx channels with device down                      ok
  aggregation again with default and TSO off                   ok

  This failure is different than our known issue of this test (LP:
  #1949569 with gro on/aggregation with TSO off) And we don't have this
  failure on openstack cloud in the previous cycles.

  I have also verified the following combinations:
  * 105 kernel + 106 source code - GOOD
  * 106 kernel + 106 source code - GOOD
  * 111 kernel + 106 source code - BAD
  * 111 kernel + 111 source code - BAD
  * 106 kernel + 111 source code - GOOD

  This appears to be a possible regression in the kernel to me.

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