netdev - Re: [RFC] RESEND - rdmatool

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Message-ID: <20170119221651.GA1656@obsidianresearch.com>
Date:   Thu, 19 Jan 2017 15:16:51 -0700
From:   Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:     Bart Van Assche <Bart.VanAssche@...disk.com>
Cc:     "leon@...nel.org" <leon@...nel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "arielalmogworkemails@...il.com" <arielalmogworkemails@...il.com>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "gerlitz.or@...il.com" <gerlitz.or@...il.com>
Subject: Re: [RFC] RESEND - rdmatool - tool for RDMA users

On Thu, Jan 19, 2017 at 10:06:12PM +0000, Bart Van Assche wrote:
> On Thu, 2017-01-19 at 11:03 -0700, Jason Gunthorpe wrote:
> > 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
> 
> Since the RDMA sysfs ABI defines a user space ABI and since user space
> ABIs must be backwards compatible removing the existing sysfs ABI is
> not an option. We will need to evaluate on a case-by-case basis whether
> new functionality should use sysfs or whether another mechanism should
> be used.

Not talking about getting rid of it.

But if it makes sense to use netlink for the new stuff we should make
netlink self-consistent so a netlink user does not have to fall back
to sysfs for certain things.

Jason