From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jakub Kicinski <jakub.kicinski@netronome.com>
Subject: Re: [PATCH bpf-next 2/3] bpf: btf: add btf json print functionality
Date: Fri, 22 Jun 2018 11:43:12 -0700
Message-ID: <20180622114312.1698418f@cakuba.netronome.com>
References: <20180620203051.223156973@fb.com>
        <20180620203703.101156292@fb.com>
        <20180621145935.41ff8974@cakuba.netronome.com>
        <20180621225117.dhrkrtmkfbeihbe4@kafai-mbp.dhcp.thefacebook.com>
        <20180621160719.2cfb4b58@cakuba.netronome.com>
        <20180621235746.dfq6kdtkogftw3ws@kafai-mbp.dhcp.thefacebook.com>
        <20180621172523.6cd00ed1@cakuba.netronome.com>
        <20180622012052.htkvholi674x6i4f@kafai-mbp.dhcp.thefacebook.com>
        <20180622111751.GB3050@w1t1fb>
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Cc: Martin KaFai Lau <kafai@fb.com>,
        Daniel Borkmann <daniel@iogearbox.net>,
        Alexei Starovoitov <ast@kernel.org>,
        Yonghong Song <yhs@fb.com>,
        Quentin Monnet <quentin.monnet@netronome.com>,
        "David S. Miller" <davem@davemloft.net>, <netdev@vger.kernel.org>,
        <kernel-team@fb.com>, <linux-kernel@vger.kernel.org>
To: Okash Khawaja <osk@fb.com>
Return-path: <linux-kernel-owner@vger.kernel.org>
In-Reply-To: <20180622111751.GB3050@w1t1fb>
Sender: linux-kernel-owner@vger.kernel.org
List-Id: netdev.vger.kernel.org

On Fri, 22 Jun 2018 12:17:52 +0100, Okash Khawaja wrote:
> > > > > > > The name XYZ_struct may not be the best, perhaps you can come up with a
> > > > > > > better one?  
> > > > > > > 
> > > > > > > Does that make sense?  Am I missing what you're doing here?
> > > > > > > 
> > > > > > > One process note - please make sure you run checkpatch.pl --strict on
> > > > > > > bpftool patches before posting.
> > > > > > > 
> > > > > > > Thanks for working on this!      
> > >   
> 
> Hi,
> 
> While I agree on the point of backward compatibility, I think printing
> two overlapping pieces of information side-by-side will make the
> interface less clear. Having separate outputs for the two will keep the
> interface clear and readable.
> 
> Is there a major downside to adding a new flag for BTF output?

plain output and JSON should be more or less equivalent, just formatted
differently.  If we hide the BTF-ed JSON under some flag most users
will just run bpftool -jp map dump id X, see BTF is not there and move
on, without ever looking into the man page to discover there is a magic
switch...