netdev - Re: [PATCH iproute2 3/5] rdma: Add device capability parsing

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Date:   Wed, 28 Jun 2017 07:33:37 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
        Doug Ledford <dledford@...hat.com>,
        Ariel Almog <ariela@...lanox.com>,
        Dennis Dalessandro <dennis.dalessandro@...el.com>,
        Linux RDMA <linux-rdma@...r.kernel.org>,
        Linux Netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH iproute2 3/5] rdma: Add device capability parsing

On Tue, Jun 27, 2017 at 03:18:59PM -0700, Stephen Hemminger wrote:
> On Tue, 27 Jun 2017 20:46:15 +0300
> Leon Romanovsky <leon@...nel.org> wrote:
>
> > On Tue, Jun 27, 2017 at 11:37:35AM -0600, Jason Gunthorpe wrote:
> > > On Tue, Jun 27, 2017 at 08:33:01PM +0300, Leon Romanovsky wrote:
> > >
> > > > My initial plan was to put all parsers under their respective names, in
> > > > the similar way as I did for caps: $ rdma dev show mlx5_4 caps
> > >
> > > I think you should have a useful summary display similar to 'ip a' and
> > > other commands.
> > >
> > > guid(s), subnet prefix or default gid for IB, lid/lmc, link state,
> > > speed, mtu, pkeys protocol(s)
> >
> > It will, but before I would like to see this tool be a part of
> > iproute2, so other people will be able to extend it in addition
> > to me.
> >
> > Are you fine with the proposed code?
> >
>
> Output formats need to be nailed down. The output of iproute2 commands is almost
> like an ABI. Users build scripts to parse it (whether that is a great idea or not
> is debateable, it mostly shows the weakness in programatic API's). Therefore fully
> changing output formats in later revisions is likely to get users upset.
>
> The first version doesn't have to be perfect, just close to the overall goal
> of what is planned.

In this version, I'm going to use arrays without indexes, because I prefer
to expose the bare minimum from the kernel, which is RDMA netlink. After
everything else is settled, I'll move those defines to UAPI and reuse them
in rdmatool.

I'll send new version with -d/--details flag and enrich minimal summary.
It won't include anything related to tables gids, pkey yet.

Thanks


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