netdev - Re: [PATCH ipsec-next,v2 3/3] selftests/bpf: add xfrm

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Message-ID: <CAHsH6Gt3tRqGDG5ssGZMzxB+1xToFk5-RZn319KOnB4cLnC11Q@mail.gmail.com>
Date:   Thu, 1 Dec 2022 15:33:40 +0200
From:   Eyal Birger <eyal.birger@...il.com>
To:     Martin KaFai Lau <martin.lau@...ux.dev>
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org,
        linux-kselftest@...r.kernel.org, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        steffen.klassert@...unet.com, herbert@...dor.apana.org.au,
        andrii@...nel.org, daniel@...earbox.net, nicolas.dichtel@...nd.com,
        razor@...ckwall.org, mykolal@...com, ast@...nel.org,
        song@...nel.org, yhs@...com, john.fastabend@...il.com,
        kpsingh@...nel.org, sdf@...gle.com, haoluo@...gle.com,
        jolsa@...nel.org, shuah@...nel.org
Subject: Re: [PATCH ipsec-next,v2 3/3] selftests/bpf: add xfrm_info tests

Hi Martin,

On Thu, Dec 1, 2022 at 9:33 AM Martin KaFai Lau <martin.lau@...ux.dev> wrote:
>
> On 11/30/22 9:34 PM, Eyal Birger wrote:
> >>> +static int probe_iproute2(void)
> >>> +{
> >>> +     if (SYS_NOFAIL("ip link add type xfrm help 2>&1 | "
> >>> +                    "grep external > /dev/null")) {
> >>> +             fprintf(stdout, "%s:SKIP: iproute2 with xfrm external support needed for this test\n", __func__);
> >>
> >> Unfortunately, the BPF CI iproute2 does not have this support also :(
> >> I am worry it will just stay SKIP for some time and rot.  Can you try to
> >> directly use netlink here?
> >
> > Yeah, I wasn't sure if adding a libmnl (or alternative) dependency
> > was ok here, and also didn't want to copy all that nl logic here.
> > So I figured it would get there eventually.
> >
> > I noticed libmnl is used by the nf tests, so maybe its inclusion isn't too
> > bad. Unless there's a better approach.
>
> I wasn't thinking about including the libmnl.  I am thinking about something
> lightweight like the bpf_tc_hook_create() used in this test.
> bpf_tc_hook_create() is in libbpf's netlink.c.  Not sure if this netlink
> link-add helper belongs to libbpf though, so it will be better just stay here in
> this selftest for now.  If it is too complicated without libmnl, leave it as
> SKIP for now is an option and I will try to run it manually first with a newer
> iproute2.

Looks like it doesn't turn out too bad imho without libmnl, basically
needs a few rtattr helpers.
Will do it that way in v3.

Eyal.