From: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
To: Leon Romanovsky <leon-DgEjT+Ai2ygdnm+yROfE0A@public•gmane.org>
Cc: Bart Van Assche
<bart.vanassche-XdAiOPVOjttBDgjK7y7TUQ@public•gmane.org>,
Or Gerlitz <gerlitz.or-Re5JQEeQqe8AvxtiuMwx3w@public•gmane.org>,
Ariel Almog
<arielalmogworkemails-Re5JQEeQqe8AvxtiuMwx3w@public•gmane.org>,
"linux-rdma-u79uwXL29TY76Z2rM5mHXA@public•gmane.org"
<linux-rdma-u79uwXL29TY76Z2rM5mHXA@public•gmane.org>,
Linux Netdev List
<netdev-u79uwXL29TY76Z2rM5mHXA@public•gmane.org>
Subject: Re: [RFC] RESEND - rdmatool - tool for RDMA users
Date: Thu, 19 Jan 2017 11:03:08 -0700 [thread overview]
Message-ID: <20170119180308.GD8109@obsidianresearch.com> (raw)
In-Reply-To: <20170119063326.GJ32481-U/DQcQFIOTAAJjI8aNfphQ@public.gmane.org>
On Thu, Jan 19, 2017 at 08:33:26AM +0200, Leon Romanovsky wrote:
> 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.
sysfs is unpopular because the 'one value per file' dogma is laregly
unsuitable for complex mulit-value atomic changes which are common in
netdev. You can force it to work, but it is pretty horrible..
It is also very expensive if you want to shuttle a lot of data, eg I
could not see doing something like 'netstat' for IB through sysfs
Maybe you should start by showing some examples of command out you
wish to have in a rdmatool ..
Jason
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next prev parent reply other threads:[~2017-01-19 18:03 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-18 15:19 [RFC] RESEND - rdmatool - tool for RDMA users Ariel Almog
[not found] ` <CABvr3-GZQs51Sn3XagTsepsy3CHvx6P=GVJzefajbNt9jxz9Kg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-01-18 16:48 ` Or Gerlitz
2017-01-18 17:33 ` Leon Romanovsky
2017-01-18 17:50 ` Or Gerlitz
2017-01-18 18:28 ` Leon Romanovsky
2017-01-18 18:31 ` Jason Gunthorpe
2017-01-18 21:45 ` Bart Van Assche
[not found] ` <5f90fd26-e7bf-bb2a-01f2-6b166f2265e9-XdAiOPVOjttBDgjK7y7TUQ@public.gmane.org>
2017-01-19 6:33 ` Leon Romanovsky
[not found] ` <20170119063326.GJ32481-U/DQcQFIOTAAJjI8aNfphQ@public.gmane.org>
2017-01-19 18:03 ` Jason Gunthorpe [this message]
2017-01-19 19:12 ` Leon Romanovsky
2017-01-19 22:06 ` Bart Van Assche
2017-01-19 22:16 ` Jason Gunthorpe
[not found] ` <20170119180308.GD8109-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2017-01-31 11:38 ` Ariel Almog
2017-01-19 6:04 ` Leon Romanovsky
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