linux-kernel - Re: [PATCH ipsec-next v1 6/7] bpf: selftests: test

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Date:   Sat, 25 Nov 2023 16:54:45 -0800
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Yonghong Song <yonghong.song@...ux.dev>
Cc:     Daniel Xu <dxu@...uu.xyz>, Shuah Khan <shuah@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Steffen Klassert <steffen.klassert@...unet.com>,
        antony.antony@...unet.com, Eddy Z <eddyz87@...il.com>,
        Mykola Lysenko <mykolal@...com>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        bpf <bpf@...r.kernel.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>, devel@...ux-ipsec.org,
        Network Development <netdev@...r.kernel.org>
Subject: Re: [PATCH ipsec-next v1 6/7] bpf: selftests: test_tunnel: Disable
 CO-RE relocations

On Sat, Nov 25, 2023 at 4:52 PM Yonghong Song <yonghong.song@...ux.dev> wrote:
>
> >
> > diff --git a/tools/testing/selftests/bpf/progs/test_tunnel_kern.c b/tools/testing/selftests/bpf/progs/test_tunnel_kern.c
> > index 3065a716544d..ec7e04e012ae 100644
> > --- a/tools/testing/selftests/bpf/progs/test_tunnel_kern.c
> > +++ b/tools/testing/selftests/bpf/progs/test_tunnel_kern.c
> > @@ -6,6 +6,7 @@
> >    * modify it under the terms of version 2 of the GNU General Public
> >    * License as published by the Free Software Foundation.
> >    */
> > +#define BPF_NO_PRESERVE_ACCESS_INDEX
>
> This is a temporary workaround and hopefully we can lift it in the
> near future. Please add a comment here with prefix 'Workaround' to
> explain why this is needed and later on we can earliy search the
> keyword and remember to tackle this.

I suspect we will forget to remove this "workaround" and people
will start copy pasting it.
Let's change the test instead to avoid bitfield access.