netdev - Re: [PATCH bpf] selftests/bpf: test setting tunnel key from lwt xmit

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Date:   Thu, 28 Apr 2022 10:55:41 +0300
From:   Eyal Birger <eyal.birger@...il.com>
To:     Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc:     Shuah Khan <shuah@...nel.org>, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>, Martin Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        john fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>, posk@...gle.com,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>
Subject: Re: [PATCH bpf] selftests/bpf: test setting tunnel key from lwt xmit

On Wed, Apr 27, 2022 at 10:41 PM Andrii Nakryiko
<andrii.nakryiko@...il.com> wrote:
>
> On Sun, Apr 24, 2022 at 10:23 AM Eyal Birger <eyal.birger@...il.com> wrote:
> >
> > On Sun, Apr 24, 2022 at 7:53 PM Eyal Birger <eyal.birger@...il.com> wrote:
> > >
> > > This commit adds test_egress_md() tests which perform a similar flow as
> > > test_egress() only that they use gre devices in collect_md mode and set
> > > the tunnel key from lwt bpf xmit.
> > >
> > > VRF scenarios are not checked since it is currently not possible to set
> > > the underlying device or vrf from bpf_set_tunnel_key().
> > >
> > > This introduces minor changes to the existing setup for consistency with
> > > the new tests:
> > >
> > > - GRE key must exist as bpf_set_tunnel_key() explicitly sets the
> > >   TUNNEL_KEY flag
> > >
> > > - Source address for GRE traffic is set to IPv*_5 instead of IPv*_1 since
> > >   GRE traffic is sent via veth5 so its address is selected when using
> > >   bpf_set_tunnel_key()
> > >
> > > Signed-off-by: Eyal Birger <eyal.birger@...il.com>
> > > ---
> > >  .../selftests/bpf/progs/test_lwt_ip_encap.c   | 51 ++++++++++-
> > >  .../selftests/bpf/test_lwt_ip_encap.sh        | 85 ++++++++++++++++++-
> > >  2 files changed, 128 insertions(+), 8 deletions(-)
> > >
> > > diff --git a/tools/testing/selftests/bpf/progs/test_lwt_ip_encap.c b/tools/testing/selftests/bpf/progs/test_lwt_ip_encap.c
> > > index d6cb986e7533..39c6bd5402ae 100644
> > > --- a/tools/testing/selftests/bpf/progs/test_lwt_ip_encap.c
> > > +++ b/tools/testing/selftests/bpf/progs/test_lwt_ip_encap.c
> >
> > Thinking about this some more, I'm not sure if these tests fit better here
> > or in test_tunnel.sh.
> >
> > If the latter is preferred, please drop this patch and I'll submit one for
> > test_tunnel.sh.
>
> general preference is to put test into test_progs as those are
> regularly and extensively exercised, while test_tunnel.sh is not

Thanks. Will move the logic there then.
>
> >
> > Eyal.