netdev - Re: [bpf PATCH] bpf, selftests: test_maps generating unrecognized data section

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Date:   Thu, 25 Mar 2021 20:03:28 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     John Fastabend <john.fastabend@...il.com>
Cc:     Andrii Nakryiko <andrii@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Alexei Starovoitov <ast@...com>
Subject: Re: [bpf PATCH] bpf, selftests: test_maps generating unrecognized
 data section

On Wed, Mar 24, 2021 at 2:07 PM John Fastabend <john.fastabend@...il.com> wrote:
>
> With a relatively recent clang master branch test_map skips a section,
>
>  libbpf: elf: skipping unrecognized data section(5) .rodata.str1.1
>

So it was on my TODO list for a while to get rid of this by combining
all .rodata* sections into one at load time. I even outline that in
"libbpf v1.0" doc ([0]). I just haven't gotten to implementing this
yet. You can safely ignore this for now. But I also have nothing
against cleaning up tests, of course.

  [0] https://docs.google.com/document/d/1UyjTZuPFWiPFyKk1tV5an11_iaRuec6U-ZESZ54nNTY


> the cause is some pointless strings from bpf_printks in the BPF program
> loaded during testing. Remove them so we stop tripping our test bots.
>
> Signed-off-by: John Fastabend <john.fastabend@...il.com>
> ---
>  .../selftests/bpf/progs/sockmap_tcp_msg_prog.c     |    3 ---
>  1 file changed, 3 deletions(-)
>
> diff --git a/tools/testing/selftests/bpf/progs/sockmap_tcp_msg_prog.c b/tools/testing/selftests/bpf/progs/sockmap_tcp_msg_prog.c
> index fdb4bf4408fa..0f603253f4ed 100644
> --- a/tools/testing/selftests/bpf/progs/sockmap_tcp_msg_prog.c
> +++ b/tools/testing/selftests/bpf/progs/sockmap_tcp_msg_prog.c
> @@ -16,10 +16,7 @@ int bpf_prog1(struct sk_msg_md *msg)
>         if (data + 8 > data_end)
>                 return SK_DROP;
>
> -       bpf_printk("data length %i\n", (__u64)msg->data_end - (__u64)msg->data);
>         d = (char *)data;
> -       bpf_printk("hello sendmsg hook %i %i\n", d[0], d[1]);
> -
>         return SK_PASS;
>  }
>
>