netdev - Re: [PATCH bpf v2 0/7] selftests/bpf: Restore test

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Message-ID: <87r1o0ot50.fsf@toke.dk>
Date:   Tue, 08 Dec 2020 23:00:27 +0100
From:   Toke Høiland-Jørgensen <toke@...hat.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andriin@...com>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Romain Perier <romain.perier@...il.com>,
        Allen Pais <apais@...ux.microsoft.com>,
        Grygorii Strashko <grygorii.strashko@...com>,
        Simon Horman <simon.horman@...ronome.com>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        Wei Yongjun <weiyongjun1@...wei.com>,
        Jiri Benc <jbenc@...hat.com>, oss-drivers@...ronome.com,
        linux-omap@...r.kernel.org, netdev@...r.kernel.org,
        bpf@...r.kernel.org
Subject: Re: [PATCH bpf v2 0/7] selftests/bpf: Restore test_offload.py to
 working order

Jakub Kicinski <kuba@...nel.org> writes:

> On Tue, 08 Dec 2020 15:18:31 +0100 Toke Høiland-Jørgensen wrote:
>> Toke Høiland-Jørgensen <toke@...hat.com> 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  
>> 
>> Any feedback on v2? Would be great to get it merged before the final
>> 5.10 release :)
>
> LGTM but if my opinion mattered this could would not have been changed
> in the first place :)

Heh, right. Well I, for one, value your input, so thanks for taking a
look :)

-Toke