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

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Message-ID: <20210331045522.5gigzyheib5zk2r2@kafai-mbp.dhcp.thefacebook.com>
Date:   Tue, 30 Mar 2021 21:55:22 -0700
From:   Martin KaFai Lau <kafai@...com>
To:     "Jiang Wang ." <jiang.wang@...edance.com>
CC:     Cong Wang <xiyou.wangcong@...il.com>,
        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>
Subject: Re: [External] Re: [PATCH v2 bpf-next 00/14] bpf: Support calling
 kernel function

On Tue, Mar 30, 2021 at 08:28:34PM -0700, Jiang Wang . wrote:
> I am working with Cong to get Clang/LLVM-13 to test. But I am confused
> whether CLANG/LLVM-13 is released or not.
> 
> From https://apt.llvm.org/  , I saw llvm-13 was released in Feb, but it
> does not have the diff you mentioned.
I haven't used the Debian/Ubuntu nightly packages, so don't know.

> 
> From the following links, I am not sure if LLVM-13 was really released
> or still in the process.
> https://llvm.org/docs/ReleaseNotes.html#external-open-source-projects-using-llvm-13 
> https://github.com/llvm/llvm-project/releases
AFAIK, it is not released, so please directly clone from the llvm-project
as also suggested earlier by Pedro.

Please refer to the "how do I build LLVM" in Documentation/bpf/bpf_devel_QA.rst.

[ Please do not top post.  Reply inline instead.
  It will be difficult for others to follow. ]

> On Tue, Mar 30, 2021 at 2:43 PM Martin KaFai Lau <kafai@...com> wrote:
> >
> > 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