netdev - Re: [PATCH v2 bpf-next 00/14] bpf: Support calling kernel function

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Date:   Tue, 30 Mar 2021 12:58:22 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     Lorenz Bauer <lmb@...udflare.com>, Martin KaFai Lau <kafai@...com>,
        bpf <bpf@...r.kernel.org>, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Kernel Team <kernel-team@...com>,
        Networking <netdev@...r.kernel.org>,
        Jiang Wang <jiang.wang@...edance.com>
Subject: Re: [PATCH v2 bpf-next 00/14] bpf: Support calling kernel function

On Tue, Mar 30, 2021 at 7:36 AM Alexei Starovoitov
<alexei.starovoitov@...il.com> wrote:
>
> On Tue, Mar 30, 2021 at 2:43 AM Lorenz Bauer <lmb@...udflare.com> wrote:
> >
> > On Thu, 25 Mar 2021 at 01:52, Martin KaFai Lau <kafai@...com> wrote:
> > >
> > > This series adds support to allow bpf program calling kernel function.
> >
> > I think there are more build problems with this. Has anyone hit this before?
> >
> > $ CLANG=clang-12 O=../kbuild/vm ./tools/testing/selftests/bpf/vmtest.sh -j 7
> >
> >   GEN-SKEL [test_progs-no_alu32] bind6_prog.skel.h
> > libbpf: elf: skipping unrecognized data section(5) .rodata.str1.1
> >   GEN-SKEL [test_progs-no_alu32] bind_perm.skel.h
> > libbpf: elf: skipping unrecognized data section(5) .rodata.str1.1
> >   GEN-SKEL [test_progs-no_alu32] bpf_cubic.skel.h
> >   GEN-SKEL [test_progs-no_alu32] bpf_dctcp.skel.h
> >   GEN-SKEL [test_progs-no_alu32] bpf_flow.skel.h
> > libbpf: failed to find BTF for extern 'tcp_cong_avoid_ai' [27] section: -2
> > Error: failed to open BPF object file: No such file or directory
>
> The doc update is on its way:
> https://patchwork.kernel.org/project/netdevbpf/patch/20210330054156.2933804-1-kafai@fb.com/

We just updated our clang to 13, and I still get the same error above.

Thanks.