netdev - Re: [RFC iproute2 0/8] RDMA tool

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Message-ID: <20170505131754.GH22833@mtr-leonro.local>
Date:   Fri, 5 May 2017 16:17:54 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Jiri Benc <jbenc@...hat.com>
Cc:     Stephen Hemminger <stephen@...workplumber.org>,
        Doug Ledford <dledford@...hat.com>,
        Jiri Pirko <jiri@...lanox.com>,
        Ariel Almog <ariela@...lanox.com>,
        Dennis Dalessandro <dennis.dalessandro@...el.com>,
        Ram Amrani <ram.amrani@...ium.com>,
        Bart Van Assche <Bart.VanAssche@...disk.com>,
        Sagi Grimberg <sagi@...mberg.me>,
        Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
        Christoph Hellwig <hch@....de>,
        Or Gerlitz <ogerlitz@...lanox.com>,
        Linux RDMA <linux-rdma@...r.kernel.org>,
        Linux Netdev <netdev@...r.kernel.org>
Subject: Re: [RFC iproute2 0/8] RDMA tool

On Fri, May 05, 2017 at 08:54:57AM +0200, Jiri Benc wrote:
> On Thu,  4 May 2017 21:02:08 +0300, Leon Romanovsky wrote:
> > In order to close object model, ensure reuse of existing code and make this
> > tool usable from day one, we decided to implement wrappers over legacy sysfs
> > prior to implementing netlink functionality. As a nice bonus, it will allow
> > to use this tool with old kernels too.
>
> This sounds wrong. We don't support legacy ioctl interface for the 'ip'
> command, either. I think rdma should be converted to netlink first and
> the new tool should only use netlink.

RDMA in slightly different situation than "ip" tool was. "ip" was implemented
when tools like ifconfig existed. It allowed to old and new systems to be
configured to some degree. In RDMA community, there are no similar tools like
"ifconfig". Implementation in netlink-only interface will leave old systems without
common tool at all.

As an upstream-oriented person, I personally fine with that, but anyway would
like to get wider agreement/disagreement on that, before removing sysfs
parsing logic from the rdmatool.

Thanks

>
>  Jiri

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