netdev - Re: [PATCH bpf v4 0/7] selftests/bpf: Restore test

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Date:   Wed, 9 Dec 2020 16:40:39 +0100
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Toke Høiland-Jørgensen <toke@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     "David S. Miller" <davem@...emloft.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 v4 0/7] selftests/bpf: Restore test_offload.py to
 working order

On 12/9/20 2:57 PM, Toke Høiland-Jørgensen wrote:
> 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:
> 
> v4:
> - Accidentally truncated the Fixes: hashes in patches 3/4 to 11 chars
> v3:
> - Add Fixes: tags
> v2:
> - Replace xdp_attachment_flags_ok() with a check in dev_xdp_attach()
> - Better packing of struct nsim_dev

Applied, thanks! I took the liberty to document the prior review with 'LGTM' as
an Ack so it's documented in the git log as well.