netdev - Re: [RFC] RESEND - rdmatool

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Date:   Thu, 19 Jan 2017 08:33:26 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Bart Van Assche <bart.vanassche@...disk.com>
Cc:     Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
        Or Gerlitz <gerlitz.or@...il.com>,
        Ariel Almog <arielalmogworkemails@...il.com>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: [RFC] RESEND - rdmatool - tool for RDMA users

On Wed, Jan 18, 2017 at 01:45:14PM -0800, Bart Van Assche wrote:
> On 01/18/2017 10:31 AM, Jason Gunthorpe wrote:
> > I think it depends on what this tool is supposed to cover, but based
> > on the description, I would start with netlink-only.
> >
> > The only place verbs covers a similar ground is in 'device
> > capabilities' - for some of that you might want to open a new-uAPI
> > verbs fd, but even the capability data from that would not be
> > totally offensive to be accessed over netlink.
> >
> > IMHO netlink should cover almost everything found in sysfs today.
>
> We would need a very strong argument to introduce a netlink API that
> duplicates existing sysfs API functionality. Since the sysfs API is
> extensible, why not extend that API further? E.g. the SCST sysfs API
> shows that more is possible with sysfs than what most kernel drivers
> realize.

We didn't look deeply on sysfs mainly because it is unpopular
in netdev community. Maybe we were misled and it is simply not true.

>
> Bart.
> --
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