netdev - Re: [PATCH net-next 2/2] tools: bpf: add bpftool

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Message-ID: <20170927035742.5c9ee8c3@cakuba>
Date:   Wed, 27 Sep 2017 03:57:42 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     Jesper Dangaard Brouer <brouer@...hat.com>
Cc:     Alexei Starovoitov <alexei.starovoitov@...il.com>,
        netdev@...r.kernel.org, daniel@...earbox.net, davem@...emloft.net,
        hannes@...essinduktion.org, dsahern@...il.com,
        oss-drivers@...ronome.com,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>
Subject: Re: [PATCH net-next 2/2] tools: bpf: add bpftool

On Wed, 27 Sep 2017 12:45:11 +0200, Jesper Dangaard Brouer wrote:
> On Wed, 27 Sep 2017 00:02:08 +0100
> Jakub Kicinski <jakub.kicinski@...ronome.com> wrote:
> 
> > On Tue, 26 Sep 2017 15:24:06 -0700, Alexei Starovoitov wrote:  
> > > On Tue, Sep 26, 2017 at 08:35:22AM -0700, Jakub Kicinski wrote:    
> > > > Add a simple tool for querying and updating BPF objects on the system.
> > > > 
> > > > Signed-off-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
> > > > Reviewed-by: Simon Horman <simon.horman@...ronome.com>  
> [...]
> > > >  tools/bpf/Makefile             |  18 +-
> > > >  tools/bpf/bpftool/Makefile     |  80 +++++
> > > >  tools/bpf/bpftool/common.c     | 214 ++++++++++++
> > > >  tools/bpf/bpftool/jit_disasm.c |  83 +++++
> > > >  tools/bpf/bpftool/main.c       | 212 ++++++++++++
> > > >  tools/bpf/bpftool/main.h       |  99 ++++++
> > > >  tools/bpf/bpftool/map.c        | 742 +++++++++++++++++++++++++++++++++++++++++
> > > >  tools/bpf/bpftool/prog.c       | 392 ++++++++++++++++++++++
> > > >  8 files changed, 1837 insertions(+), 3 deletions(-)      
> > > ...    
> > > > +static int do_help(int argc, char **argv)
> > > > +{
> > > > +	fprintf(stderr,
> > > > +		"Usage: %s %s show   [MAP]\n"
> > > > +		"       %s %s dump    MAP\n"
> > > > +		"       %s %s update  MAP  key BYTES value VALUE [UPDATE_FLAGS]\n"
> > > > +		"       %s %s lookup  MAP  key BYTES\n"
> > > > +		"       %s %s getnext MAP [key BYTES]\n"
> > > > +		"       %s %s delete  MAP  key BYTES\n"
> > > > +		"       %s %s pin     MAP  FILE\n"
> > > > +		"       %s %s help\n"
> > > > +		"\n"
> > > > +		"       MAP := { id MAP_ID | pinned FILE }\n"
> > > > +		"       " HELP_SPEC_PROGRAM "\n"
> > > > +		"       VALUE := { BYTES | MAP | PROG }\n"
> > > > +		"       UPDATE_FLAGS := { any | exist | noexist }\n"
> > > > +		"",      
> > > 
> > > overall looks good to me, but still difficult to grasp how to use it.
> > > Can you add README with example usage and expected output?    
> > 
> > I have a README on GitHub, but I was thinking about perhaps writing a
> > proper man page?  Do you prefer one over the other?  
> 
> I would prefer adding a README.rst file, in RST-format, as the rest of
> the kernel documentation is moving in that direction[1] (your github
> version is in README.md format).  A man page will always be
> out-of-sync, and even out-of-sync on different distros.
> 
>  See[1]: https://www.kernel.org/doc/html/latest/
> 
> And then I would find some place in Documentation/admin-guide/ and
> include the README.rst file, so it shows up at [1].
> 
> RST have an include method like:
> 
> .. include:: ../../tools/bpf/bpftool/README.rst

Can the docs in new format be rendered into a man page?  Call me old
fashioned but I think we should provide some form of a man page.. :)