netdev - Re: [PATCH bpf] libbpf: add libbpf

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Date:   Fri, 3 May 2019 12:53:33 -0700
From:   William Tu <u9012063@...il.com>
To:     Y Song <ys114321@...il.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        netdev <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Magnus Karlsson <magnus.karlsson@...el.com>,
        Ben Pfaff <blp@....org>
Subject: Re: [PATCH bpf] libbpf: add libbpf_util.h to header install.

On Thu, May 2, 2019 at 1:18 PM Y Song <ys114321@...il.com> wrote:
>
> On Thu, May 2, 2019 at 11:34 AM William Tu <u9012063@...il.com> wrote:
> >
> > The libbpf_util.h is used by xsk.h, so add it to
> > the install headers.
>
> Can we try to change code a little bit to avoid exposing libbpf_util.h?
> Originally libbpf_util.h is considered as libbpf internal.
> I am not strongly against this patch. But would really like to see
> whether we have an alternative not exposing libbpf_util.h.
>

The commit b7e3a28019c92ff ("libbpf: remove dependency on barrier.h in xsk.h")
adds the dependency of libbpf_util.h to xsk.h.
How about we move the libbpf_smp_* into the xsk.h, since they are
used only by xsk.h.

Regards,
William

> >
> > Reported-by: Ben Pfaff <blp@....org>
> > Signed-off-by: William Tu <u9012063@...il.com>
> > ---
> >  tools/lib/bpf/Makefile | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/tools/lib/bpf/Makefile b/tools/lib/bpf/Makefile
> > index c6c06bc6683c..f91639bf5650 100644
> > --- a/tools/lib/bpf/Makefile
> > +++ b/tools/lib/bpf/Makefile
> > @@ -230,6 +230,7 @@ install_headers:
> >                 $(call do_install,bpf.h,$(prefix)/include/bpf,644); \
> >                 $(call do_install,libbpf.h,$(prefix)/include/bpf,644); \
> >                 $(call do_install,btf.h,$(prefix)/include/bpf,644); \
> > +               $(call do_install,libbpf_util.h,$(prefix)/include/bpf,644); \
> >                 $(call do_install,xsk.h,$(prefix)/include/bpf,644);
> >
> >  install_pkgconfig: $(PC_FILE)
> > --
> > 2.7.4
> >