netdev - Re: [PATCHv3] selftests: rtnetlink: load fou module for kci_test_encap

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Message-ID: <CAMy_GT-kaqkcdR+0q5eKoW3CJn7dZSCfr+UxRf6e5iRzZMiKTA@mail.gmail.com>
Date:   Tue, 8 Sep 2020 14:57:24 +0800
From:   Po-Hsu Lin <po-hsu.lin@...onical.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     David Miller <davem@...emloft.net>,
        Shuah Khan <skhan@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        linux-kselftest@...r.kernel.org
Subject: Re: [PATCHv3] selftests: rtnetlink: load fou module for
 kci_test_encap_fou() test

On Tue, Sep 8, 2020 at 4:12 AM Jakub Kicinski <kuba@...nel.org> wrote:
>
> On Mon,  7 Sep 2020 11:50:10 +0800 Po-Hsu Lin wrote:
> > The kci_test_encap_fou() test from kci_test_encap() in rtnetlink.sh
> > needs the fou module to work. Otherwise it will fail with:
> >
> >   $ ip netns exec "$testns" ip fou add port 7777 ipproto 47
> >   RTNETLINK answers: No such file or directory
> >   Error talking to the kernel
> >
> > Add the CONFIG_NET_FOU into the config file as well. Which needs at
> > least to be set as a loadable module.
> >
> > Signed-off-by: Po-Hsu Lin <po-hsu.lin@...onical.com>
>
> > diff --git a/tools/testing/selftests/net/rtnetlink.sh b/tools/testing/selftests/net/rtnetlink.sh
> > index 7c38a90..a711b3e 100755
> > --- a/tools/testing/selftests/net/rtnetlink.sh
> > +++ b/tools/testing/selftests/net/rtnetlink.sh
> > @@ -520,6 +520,11 @@ kci_test_encap_fou()
> >               return $ksft_skip
> >       fi
> >
> > +     if ! /sbin/modprobe -q -n fou; then
> > +             echo "SKIP: module fou is not found"
> > +             return $ksft_skip
> > +     fi
> > +     /sbin/modprobe -q fou
> >       ip -netns "$testns" fou add port 7777 ipproto 47 2>/dev/null
> >       if [ $? -ne 0 ];then
> >               echo "FAIL: can't add fou port 7777, skipping test"
> > @@ -540,6 +545,7 @@ kci_test_encap_fou()
> >               return 1
> >       fi
> >
> > +     /sbin/modprobe -q -r fou
>
> I think the common practice is to not remove the module at the end of
> the test. It may be used by something else than the test itself.
>
Hello Jakub,
Thanks for your feedback.

For this case I think it's safe to remove the module here, as it was
never loaded before and thus causing this test to fail.
If other tests in this rtnetlink.sh need this fou module, we should be
able to spot those failures too, however this is the only failure as I
can see.
(pmtu.sh will need fou module to run as well, but it will be loaded there.)

Shouldn't we insert the required module whenever the test needs it? So
that we can run the test itself directly, without depending on other
tests.
Also, I can see modules for tests were being unloaded in other tests as well.

Thanks

> >       echo "PASS: fou"
> >  }
> >
>