netdev - Re: [RFC] RESEND - rdmatool

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Date:   Thu, 19 Jan 2017 22:06:12 +0000
From:   Bart Van Assche <Bart.VanAssche@...disk.com>
To:     "jgunthorpe@...idianresearch.com" <jgunthorpe@...idianresearch.com>,
        "leon@...nel.org" <leon@...nel.org>
CC:     "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, 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.

Bart.