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

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Message-ID: <20210330214301.ssskul54hyh67o77@kafai-mbp.dhcp.thefacebook.com>
Date:   Tue, 30 Mar 2021 14:43:01 -0700
From:   Martin KaFai Lau <kafai@...com>
To:     Cong Wang <xiyou.wangcong@...il.com>
CC:     Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Lorenz Bauer <lmb@...udflare.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 12:58:22PM -0700, Cong Wang wrote:
> 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.
Please check if the llvm/clang has this diff
https://reviews.llvm.org/D93563