Subject: Re: [PATCH bpf v2 0/7] selftests/bpf: Restore test_offload.py to working order

From: Toke Høiland-Jørgensen <[email-masked]>
Date: Tue, 08 Dec 2020 15:18:31 +0100

Toke Høiland-Jørgensen <[email-masked]> writes:

> This series restores the test_offload.py selftest to working order. It seems a
> number of subtle behavioural changes have crept into various subsystems which
> broke test_offload.py in a number of ways. Most of these are fairly benign
> changes where small adjustments to the test script seems to be the best fix, but
> one is an actual kernel bug that I've observed in the wild caused by a bad
> interaction between xdp_attachment_flags_ok() and the rework of XDP program
> handling in the core netdev code.
>
> Patch 1 fixes the bug by removing xdp_attachment_flags_ok(), and the reminder of
> the patches are adjustments to test_offload.py, including a new feature for
> netdevsim to force a BPF verification fail. Please see the individual patches
> for details.
>
> Changelog:
>
> v2:
> - Replace xdp_attachment_flags_ok() with a check in dev_xdp_attach()
> - Better packing of struct nsim_dev

Hi Jakub

Any feedback on v2? Would be great to get it merged before the final
5.10 release :)

-Toke