netdev - Re: [PATCHv2 bpf-next 3/5] selftests/bpf: Add re-attach test to fexit

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Date:   Thu, 8 Apr 2021 13:51:32 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc:     Jiri Olsa <jolsa@...nel.org>, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andriin@...com>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Toke Høiland-Jørgensen <toke@...hat.com>
Subject: Re: [PATCHv2 bpf-next 3/5] selftests/bpf: Add re-attach test to
 fexit_test

On Wed, Apr 07, 2021 at 03:51:46PM -0700, Andrii Nakryiko wrote:
> On Wed, Apr 7, 2021 at 4:21 AM Jiri Olsa <jolsa@...nel.org> wrote:
> >
> > Adding the test to re-attach (detach/attach again) tracing
> > fexit programs, plus check that already linked program can't
> > be attached again.
> >
> > Fixing the number of check-ed results, which should be 8.
> >
> > Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> > ---
> >  .../selftests/bpf/prog_tests/fexit_test.c     | 48 +++++++++++++++----
> >  1 file changed, 38 insertions(+), 10 deletions(-)
> >
> > diff --git a/tools/testing/selftests/bpf/prog_tests/fexit_test.c b/tools/testing/selftests/bpf/prog_tests/fexit_test.c
> > index 78d7a2765c27..579e620e6612 100644
> > --- a/tools/testing/selftests/bpf/prog_tests/fexit_test.c
> > +++ b/tools/testing/selftests/bpf/prog_tests/fexit_test.c
> > @@ -3,20 +3,24 @@
> >  #include <test_progs.h>
> >  #include "fexit_test.skel.h"
> >
> > -void test_fexit_test(void)
> > +static __u32 duration;
> > +
> > +static int fexit_test(struct fexit_test *fexit_skel)
> >  {
> > -       struct fexit_test *fexit_skel = NULL;
> > +       struct bpf_link *link;
> >         int err, prog_fd, i;
> > -       __u32 duration = 0, retval;
> >         __u64 *result;
> > -
> > -       fexit_skel = fexit_test__open_and_load();
> > -       if (CHECK(!fexit_skel, "fexit_skel_load", "fexit skeleton failed\n"))
> > -               goto cleanup;
> > +       __u32 retval;
> >
> >         err = fexit_test__attach(fexit_skel);
> >         if (CHECK(err, "fexit_attach", "fexit attach failed: %d\n", err))
> > -               goto cleanup;
> > +               return err;
> > +
> > +       /* Check that already linked program can't be attached again. */
> > +       link = bpf_program__attach(fexit_skel->progs.test1);
> > +       if (CHECK(!IS_ERR(link), "fexit_attach_link",
> > +                 "re-attach without detach should not succeed"))
> > +               return -1;
> >
> >         prog_fd = bpf_program__fd(fexit_skel->progs.test1);
> >         err = bpf_prog_test_run(prog_fd, 1, NULL, 0,
> > @@ -26,12 +30,36 @@ void test_fexit_test(void)
> >               err, errno, retval, duration);
> >
> >         result = (__u64 *)fexit_skel->bss;
> > -       for (i = 0; i < 6; i++) {
> > +       for (i = 0; i < 8; i++) {
> >                 if (CHECK(result[i] != 1, "result",
> >                           "fexit_test%d failed err %lld\n", i + 1, result[i]))
> > -                       goto cleanup;
> > +                       return -1;
> >         }
> >
> > +       fexit_test__detach(fexit_skel);
> > +
> > +       /* zero results for re-attach test */
> > +       for (i = 0; i < 8; i++)
> > +               result[i] = 0;
> 
> memset(fexit_skel->bss, 0, sizeof(*fexit_skel->bss)) ? ;)
> 
> and see my nits in previous patch about ASSERT over CHECK

sure ;-) thanks

jirka