ACK: [SRU][J][PATCH 0/1] Fix udpgro.sh selftest failure on Jammy 5.15

[Edoardo Canepa]

Acked-by: Edoardo Canepa <edoardo.canepa at canonical.com>

On 9/4/26 06:09, Aaron Ma via kernel-team wrote:
> BugLink: https://bugs.launchpad.net/bugs/2129861
>
> SRU Justification:
>
> [ Impact ]
> Running `tools/testing/selftests/net/udpgro.sh` fails on Jammy 5.15 kernels with:
>    GRO ./udpgso_bench_rx: recv: bad packet len, got 1472, expected 14720
>
> In commit 886a0a957ce0 ("net: veth: do not manipulate GRO when using XDP")
> (upstream commit d7db7775ea2e), veth was changed so that attaching an XDP
> program no longer automatically enables the GRO feature bit. However, udpgro.sh
> previously relied on attaching xdp_dummy.o to trigger GRO.
>
> Furthermore, upstream commit 7167395a4be7 ("selftests: udpgro: report error
> when receive failed") landed in Jammy 5.15 in commit f83d21a592ca (via v5.15.190),
> causing udpgro.sh to check the receiver process exit code and actively report the
> failure that had previously been silently ignored.
>
> [ Fix ]
> Backport upstream commit d7818402b1d8 ("selftests: udpgro: no need to load
> xdp for gro"). This replaces the XDP dummy program attachment with explicit
> `ethtool -K veth1 gro on` and removes the dependency on xdp_dummy.o.
>
> Context was adjusted due to the absence of commit 6b88ce902f0b ("selftests:
> net: name bpf objects consistently and simplify Makefile") in 5.15.
>
> [ Test Plan ]
> Build and execute the udpgro test:
>    cd tools/testing/selftests/net
>    make udpgso_bench_tx udpgso_bench_rx
>    sudo ./udpgro.sh
>
> All test cases must report "ok" with exit code 0.
> Verified on a target machine running Jammy 5.15 kernel (5.15.0-191-generic).
>
> [ Where problems could occur ]
> Changes are strictly isolated to tools/testing/selftests/net/udpgro.sh and
> do not touch any kernel code or runtime drivers. Risk of regression in
> production environments is none.
>
> Hangbin Liu (1):
>    selftests: udpgro: no need to load xdp for gro
>
>   tools/testing/selftests/net/udpgro.sh | 7 +------
>   1 file changed, 1 insertion(+), 6 deletions(-)
>
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