netdev - Re: [PATCH bpf-next v4 2/8] libbpf: Implement changes needed for BTFGen in bpftool

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Date:   Fri, 21 Jan 2022 15:44:54 -0500
From:   Mauricio Vásquez Bernal <mauricio@...volk.io>
To:     Quentin Monnet <quentin@...valent.com>
Cc:     Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Rafael David Tinoco <rafaeldtinoco@...il.com>,
        Lorenzo Fontana <lorenzo.fontana@...stic.co>,
        Leonardo Di Donato <leonardo.didonato@...stic.co>
Subject: Re: [PATCH bpf-next v4 2/8] libbpf: Implement changes needed for
 BTFGen in bpftool

On Wed, Jan 12, 2022 at 1:08 PM Quentin Monnet <quentin@...valent.com> wrote:
>
> 2022-01-12 09:27 UTC-0500 ~ Mauricio Vásquez <mauricio@...volk.io>
> > This commit extends libbpf with the features that are needed to
> > implement BTFGen:
> >
> > - Implement bpf_core_create_cand_cache() and bpf_core_free_cand_cache()
> > to handle candidates cache.
> > - Expose bpf_core_add_cands() and bpf_core_free_cands to handle
> > candidates list.
> > - Expose bpf_core_calc_relo_insn() to bpftool.
> >
> > Signed-off-by: Mauricio Vásquez <mauricio@...volk.io>
> > Signed-off-by: Rafael David Tinoco <rafael.tinoco@...asec.com>
> > Signed-off-by: Lorenzo Fontana <lorenzo.fontana@...stic.co>
> > Signed-off-by: Leonardo Di Donato <leonardo.didonato@...stic.co>
> > ---
> >  tools/lib/bpf/Makefile          |  2 +-
> >  tools/lib/bpf/libbpf.c          | 43 +++++++++++++++++++++------------
> >  tools/lib/bpf/libbpf_internal.h | 12 +++++++++
> >  3 files changed, 41 insertions(+), 16 deletions(-)
> >
> > diff --git a/tools/lib/bpf/Makefile b/tools/lib/bpf/Makefile
> > index f947b61b2107..dba019ee2832 100644
> > --- a/tools/lib/bpf/Makefile
> > +++ b/tools/lib/bpf/Makefile
> > @@ -239,7 +239,7 @@ install_lib: all_cmd
> >
> >  SRC_HDRS := bpf.h libbpf.h btf.h libbpf_common.h libbpf_legacy.h xsk.h            \
> >           bpf_helpers.h bpf_tracing.h bpf_endian.h bpf_core_read.h         \
> > -         skel_internal.h libbpf_version.h
> > +         skel_internal.h libbpf_version.h relo_core.h libbpf_internal.h
> >  GEN_HDRS := $(BPF_GENERATED)
>
> I don't think these headers should be added to libbpf's SRC_HDRS. If we
> must make them available to bpftool, we probably want to copy them
> explicitly through LIBBPF_INTERNAL_HDRS in bpftool's Makefile.

I got confused, thanks for catching this up!