From: Daniel Borkmann <daniel@iogearbox.net>
To: Alexei Starovoitov <alexei.starovoitov@gmail.com>
Cc: "Toke Høiland-Jørgensen" <toke@redhat.com>,
"Andrii Nakryiko" <andrii.nakryiko@gmail.com>,
"Jiri Olsa" <jolsa@kernel.org>,
"Arnaldo Carvalho de Melo" <acme@kernel.org>,
lkml <linux-kernel@vger.kernel.org>,
Networking <netdev@vger.kernel.org>, bpf <bpf@vger.kernel.org>,
"Ingo Molnar" <mingo@kernel.org>,
"Namhyung Kim" <namhyung@kernel.org>,
"Alexander Shishkin" <alexander.shishkin@linux.intel.com>,
"Peter Zijlstra" <a.p.zijlstra@chello.nl>,
"Michael Petlan" <mpetlan@redhat.com>,
"Jesper Dangaard Brouer" <brouer@redhat.com>,
"Martin KaFai Lau" <kafai@fb.com>,
"Song Liu" <songliubraving@fb.com>, "Yonghong Song" <yhs@fb.com>,
"Andrii Nakryiko" <andriin@fb.com>,
"Quentin Monnet" <quentin.monnet@netronome.com>
Subject: Re: [PATCHv4 0/6] perf/bpftool: Allow to link libbpf dynamically
Date: Wed, 4 Dec 2019 19:27:27 +0100 [thread overview]
Message-ID: <20191204182727.GA29780@localhost.localdomain> (raw)
In-Reply-To: <CAADnVQJeC9FQDXhv34KTiFSRq-=x4cBaspj-bTXdQ1=7prphcA@mail.gmail.com>
On Wed, Dec 04, 2019 at 09:39:59AM -0800, Alexei Starovoitov wrote:
> On Wed, Dec 4, 2019 at 2:58 AM Toke Høiland-Jørgensen <toke@redhat.com> wrote:
> > Alexei Starovoitov <alexei.starovoitov@gmail.com> writes:
> > > On Mon, Dec 2, 2019 at 1:15 PM Toke Høiland-Jørgensen <toke@redhat.com> wrote:
> > >>
> > >> Ah, that is my mistake: I was getting dynamic libbpf symbols with this
> > >> approach, but that was because I had the version of libbpf.so in my
> > >> $LIBDIR that had the patch to expose the netlink APIs as versioned
> > >> symbols; so it was just pulling in everything from the shared library.
> > >>
> > >> So what I was going for was exactly what you described above; but it
> > >> seems that doesn't actually work. Too bad, and sorry for wasting your
> > >> time on this :/
> > >
> > > bpftool is currently tightly coupled with libbpf and very likely
> > > in the future the dependency will be even tighter.
> > > In that sense bpftool is an extension of libbpf and libbpf is an extension
> > > of bpftool.
> > > Andrii is working on set of patches to generate user space .c code
> > > from bpf program.
> > > bpftool will be generating the code that is specific for the version
> > > bpftool and for
> > > the version of libbpf. There will be compatibility layers as usual.
> > > But in general the situation where a bug in libbpf is so criticial
> > > that bpftool needs to repackaged is imo less likely than a bug in
> > > bpftool that will require re-packaging of libbpf.
> > > bpftool is quite special. It's not a typical user of libbpf.
> > > The other way around is more correct. libbpf is a user of the code
> > > that bpftool generates and both depend on each other.
> > > perf on the other side is what typical user space app that uses
> > > libbpf will look like.
> > > I think keeping bpftool in the kernel while packaging libbpf
> > > out of github was an oversight.
> > > I think we need to mirror bpftool into github/libbpf as well
> > > and make sure they stay together. The version of libbpf == version of bpftool.
> > > Both should come from the same package and so on.
> > > May be they can be two different packages but
> > > upgrading one should trigger upgrade of another and vice versa.
> > > I think one package would be easier though.
> > > Thoughts?
> >
> > Yup, making bpftool explicitly the "libbpf command line interface" makes
> > sense and would help clarify the relationship between the two. As Jiri
> > said, we are already moving in that direction packaging-wise...
>
> Awesome. Let's figure out the logistics.
> Should we do:
> git mv tools/bpf/bpftool/ tools/lib/bpf/
> and appropriate adjustment to Makefiles ?
> or keep it where it is and only add to
> https://github.com/libbpf/libbpf/blob/master/scripts/sync-kernel.sh ?
I'd be in preference of the latter aka keeping where it is.
Thanks,
Daniel
next prev parent reply other threads:[~2019-12-04 18:27 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-02 13:18 [PATCHv4 0/6] perf/bpftool: Allow to link libbpf dynamically Jiri Olsa
2019-12-02 13:18 ` [PATCH 1/6] perf tools: Allow to specify libbpf install directory Jiri Olsa
2019-12-02 13:18 ` [PATCH 2/6] bpftool: Allow to link libbpf dynamically Jiri Olsa
2019-12-02 13:18 ` [PATCH 3/6] bpftool: Rename BPF_DIR Makefile variable to LIBBPF_SRC_DIR Jiri Olsa
2019-12-02 13:18 ` [PATCH 4/6] bpftool: Rename LIBBPF_OUTPUT Makefile variable to LIBBPF_BUILD_OUTPUT Jiri Olsa
2019-12-02 13:18 ` [PATCH 5/6] bpftool: Rename LIBBPF_PATH Makefile variable to LIBBPF_BUILD_PATH Jiri Olsa
2019-12-02 13:18 ` [PATCH 6/6] selftests, bpftool: Add build test for libbpf dynamic linking Jiri Olsa
2019-12-02 15:38 ` Quentin Monnet
2019-12-02 19:41 ` [PATCHv4 0/6] perf/bpftool: Allow to link libbpf dynamically Andrii Nakryiko
2019-12-02 21:15 ` Toke Høiland-Jørgensen
2019-12-04 5:52 ` Alexei Starovoitov
2019-12-04 9:01 ` Jiri Olsa
2019-12-04 10:57 ` Toke Høiland-Jørgensen
2019-12-04 17:39 ` Alexei Starovoitov
2019-12-04 18:27 ` Daniel Borkmann [this message]
2019-12-04 20:22 ` Toke Høiland-Jørgensen
2019-12-04 21:16 ` Andrii Nakryiko
2019-12-04 21:54 ` Jakub Kicinski
2019-12-04 23:39 ` Alexei Starovoitov
2019-12-05 0:23 ` Jakub Kicinski
2019-12-05 0:29 ` David Miller
2019-12-05 1:25 ` Alexei Starovoitov
2019-12-05 1:09 ` Alexei Starovoitov
2019-12-05 2:10 ` Jakub Kicinski
2019-12-05 3:17 ` Alexei Starovoitov
2019-12-05 4:26 ` Jakub Kicinski
2019-12-05 6:44 ` Alexei Starovoitov
2019-12-05 8:35 ` Jesper Dangaard Brouer
2019-12-05 12:09 ` Michal Rostecki
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