netdev - Re: [PATCH net-next 08/13] net: dsa: hellcreek: deny tc-taprio changes to per-tc max SDU

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Date:   Thu, 15 Sep 2022 11:59:26 +0000
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     Kurt Kanzenbach <kurt@...utronix.de>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
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        Xiaoliang Yang <xiaoliang.yang_1@....com>,
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        Claudiu Manoil <claudiu.manoil@....com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        "UNGLinuxDriver@...rochip.com" <UNGLinuxDriver@...rochip.com>,
        Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
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        Vinicius Costa Gomes <vinicius.gomes@...el.com>,
        Maxim Kochetkov <fido_max@...ox.ru>,
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        Grygorii Strashko <grygorii.strashko@...com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next 08/13] net: dsa: hellcreek: deny tc-taprio
 changes to per-tc max SDU

On Thu, Sep 15, 2022 at 08:15:54AM +0200, Kurt Kanzenbach wrote:
> > So the maxSDU hardware register tracks exactly the L2 payload size, like
> > the software variable does, or does it include the Ethernet header size
> > and/or FCS?
> 
> This is something I'm not sure about. I'll ask the HW engineer when he's
> back from vacation.

You can also probably figure this out by limiting the max-sdu to a value
like 200 and seeing what frame sizes pass through.