netdev - Re: [PATCH v8 bpf-next 13/13] selftests/bpf: Add set test to resolve

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Date:   Wed, 29 Jul 2020 17:34:28 +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>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Martin KaFai Lau <kafai@...com>,
        David Miller <davem@...hat.com>,
        John Fastabend <john.fastabend@...il.com>,
        Wenbo Zhang <ethercflow@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Brendan Gregg <bgregg@...flix.com>,
        Florent Revest <revest@...omium.org>,
        Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH v8 bpf-next 13/13] selftests/bpf: Add set test to
 resolve_btfids

On Tue, Jul 28, 2020 at 12:56:02PM -0700, Andrii Nakryiko wrote:
> On Wed, Jul 22, 2020 at 2:15 PM Jiri Olsa <jolsa@...nel.org> wrote:
> >
> > Adding test to for sets resolve_btfids. We're checking that
> > testing set gets properly resolved and sorted.
> >
> > Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> > ---
> >  .../selftests/bpf/prog_tests/resolve_btfids.c | 33 +++++++++++++++++++
> >  1 file changed, 33 insertions(+)
> >
> > diff --git a/tools/testing/selftests/bpf/prog_tests/resolve_btfids.c b/tools/testing/selftests/bpf/prog_tests/resolve_btfids.c
> > index 101785b49f7e..cc90aa244285 100644
> > --- a/tools/testing/selftests/bpf/prog_tests/resolve_btfids.c
> > +++ b/tools/testing/selftests/bpf/prog_tests/resolve_btfids.c
> > @@ -48,6 +48,15 @@ BTF_ID(struct,  S)
> >  BTF_ID(union,   U)
> >  BTF_ID(func,    func)
> >
> > +BTF_SET_START(test_set)
> > +BTF_ID(typedef, S)
> > +BTF_ID(typedef, T)
> > +BTF_ID(typedef, U)
> > +BTF_ID(struct,  S)
> > +BTF_ID(union,   U)
> > +BTF_ID(func,    func)
> > +BTF_SET_END(test_set)
> > +
> >  static int
> >  __resolve_symbol(struct btf *btf, int type_id)
> >  {
> > @@ -126,5 +135,29 @@ int test_resolve_btfids(void)
> >                 }
> >         }
> >
> > +       /* Check BTF_SET_START(test_set) IDs */
> > +       for (i = 0; i < test_set.cnt && !ret; i++) {
> 
> nit: usual we just do `goto err_out;` instead of complicating exit
> condition in a for loop

ok

> 
> > +               bool found = false;
> > +
> > +               for (j = 0; j < ARRAY_SIZE(test_symbols); j++) {
> > +                       if (test_symbols[j].id != test_set.ids[i])
> > +                               continue;
> > +                       found = true;
> > +                       break;
> > +               }
> > +
> > +               ret = CHECK(!found, "id_check",
> > +                           "ID %d for %s not found in test_symbols\n",
> > +                           test_symbols[j].id, test_symbols[j].name);
> 
> j == ARRAY_SIZE(test_symbols), you probably meant to get
> test_set.ids[i] instead of test_symbol name/id?

oh yea.. test_set.ids[i] is not found in here

> 
> > +               if (ret)
> > +                       break;
> > +
> > +               if (i > 0) {
> > +                       ret = CHECK(test_set.ids[i - 1] > test_set.ids[i],
> 
> nit: >= would be the invalid condition

yes, we actualy allow for same IDs to appear in the set

thanks,
jirka

> 
> > +                                   "sort_check",
> > +                                   "test_set is not sorted\n");
> > +               }
> > +       }
> > +
> >         return ret;
> >  }
> > --
> > 2.25.4
> >
>