netdev - Re: [PATCH net-next v2 2/3] net: dsa: add Arrow SpeedChips XRS700x driver

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Message-ID: <20201127232140.g6ylpsovaj2tcutr@skbuf>
Date:   Sat, 28 Nov 2020 01:21:40 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     George McCollister <george.mccollister@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S . Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        "open list:OPEN FIRMWARE AND..." <devicetree@...r.kernel.org>
Subject: Re: [PATCH net-next v2 2/3] net: dsa: add Arrow SpeedChips XRS700x
 driver

On Fri, Nov 27, 2020 at 01:37:53PM -0800, Jakub Kicinski wrote:
> High speed systems are often eventually consistent. Either because
> stats are gathered from HW periodically by the FW, or RCU grace period
> has to expire, or workqueue has to run, etc. etc. I know it's annoying
> for writing tests but it's manageable.

Out of curiosity, what does a test writer need to do to get out of the
"eventual consistency" conundrum in a portable way and answer the
question "has my packet not been received by the interface or has the
counter just not updated"?