netdev - Re: [Intel-wired-lan] [PATCH 12/15] ice: Add stats and ethtool support

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Date:   Wed, 14 Mar 2018 08:13:17 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Jesse Brandeburg <jesse.brandeburg@...el.com>
Cc:     Eric Dumazet <eric.dumazet@...il.com>, davem@...emloft.net,
        "Venkataramanan, Anirudh" <anirudh.venkataramanan@...el.com>,
        "kubakici@...pl" <kubakici@...pl>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>
Subject: Re: [Intel-wired-lan] [PATCH 12/15] ice: Add stats and ethtool
 support

On Tue, 13 Mar 2018 14:14:14 -0700
Jesse Brandeburg <jesse.brandeburg@...el.com> wrote:

> Maybe it's just that I've been doing this too long, but I regularly
> (and many other customers/users do as well) depend on the ethtool stats
> being atomically updated w.r.t. each other.  This means that if I'm
> getting the over rx_packets, as well as the per-queue rx_packets, and I
> read them all at once from the driver with ethtool, then I can check
> that things are working as expected.

Any application depending on this behavior is really fragile.
It is unportable to other devices (which I guess is to Intel's benefit)
and relying on guarantees not provided by current Linux network devices.