linux-kernel - Re: [bpf-next v3 04/12] selftests/bpf: Use bpf_prog_test_run

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Message-ID: <CAGGp+cGUYbdEeHJxVCk0VZvOMSoR6Fz5aUJD0Ye71w5dxETXMA@mail.gmail.com>
Date:   Thu, 11 Jul 2019 14:07:24 +0200
From:   Krzesimir Nowak <krzesimir@...volk.io>
To:     Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc:     open list <linux-kernel@...r.kernel.org>,
        Alban Crequy <alban@...volk.io>,
        Iago López Galeiras <iago@...volk.io>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        Stanislav Fomichev <sdf@...gle.com>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        xdp-newbies@...r.kernel.org
Subject: Re: [bpf-next v3 04/12] selftests/bpf: Use bpf_prog_test_run_xattr

On Thu, Jul 11, 2019 at 2:03 AM Andrii Nakryiko
<andrii.nakryiko@...il.com> wrote:
>
> On Mon, Jul 8, 2019 at 3:43 PM Krzesimir Nowak <krzesimir@...volk.io> wrote:
> >
> > The bpf_prog_test_run_xattr function gives more options to set up a
> > test run of a BPF program than the bpf_prog_test_run function.
> >
> > We will need this extra flexibility to pass ctx data later.
> >
> > Signed-off-by: Krzesimir Nowak <krzesimir@...volk.io>
> > ---
>
> lgtm, with some nits below
>
> Acked-by: Andrii Nakryiko <andriin@...com>
>
> >  tools/testing/selftests/bpf/test_verifier.c | 16 +++++++++++-----
> >  1 file changed, 11 insertions(+), 5 deletions(-)
> >
> > diff --git a/tools/testing/selftests/bpf/test_verifier.c b/tools/testing/selftests/bpf/test_verifier.c
> > index c7541f572932..1640ba9f12c1 100644
> > --- a/tools/testing/selftests/bpf/test_verifier.c
> > +++ b/tools/testing/selftests/bpf/test_verifier.c
> > @@ -822,14 +822,20 @@ static int do_prog_test_run(int fd_prog, bool unpriv, uint32_t expected_val,
> >  {
> >         __u8 tmp[TEST_DATA_LEN << 2];
> >         __u32 size_tmp = sizeof(tmp);
>
> nit: this is now is not needed as a separate local variable, inline?

I think I'm using this variable in a followup commit, but I'll look closely.

>
> > -       uint32_t retval;
> >         int saved_errno;
> >         int err;
> > +       struct bpf_prog_test_run_attr attr = {
> > +               .prog_fd = fd_prog,
> > +               .repeat = 1,
> > +               .data_in = data,
> > +               .data_size_in = size_data,
> > +               .data_out = tmp,
> > +               .data_size_out = size_tmp,
> > +       };
> >
> >         if (unpriv)
> >                 set_admin(true);
> > -       err = bpf_prog_test_run(fd_prog, 1, data, size_data,
> > -                               tmp, &size_tmp, &retval, NULL);
> > +       err = bpf_prog_test_run_xattr(&attr);
> >         saved_errno = errno;
> >         if (unpriv)
> >                 set_admin(false);
> > @@ -846,9 +852,9 @@ static int do_prog_test_run(int fd_prog, bool unpriv, uint32_t expected_val,
> >                         return err;
> >                 }
> >         }
> > -       if (retval != expected_val &&
> > +       if (attr.retval != expected_val &&
> >             expected_val != POINTER_VALUE) {
>
> this if condition now fits one line, can you please combine? thanks!

Sure.

>
> > -               printf("FAIL retval %d != %d ", retval, expected_val);
> > +               printf("FAIL retval %d != %d ", attr.retval, expected_val);
> >                 return 1;
> >         }
> >
> > --
> > 2.20.1
> >



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