linux-kernel - Re: [PATCH net-next v4 4/4] net: dsa: microchip: ksz8: add MTU configuration support

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Date:   Thu, 10 Nov 2022 06:43:50 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Oleksij Rempel <o.rempel@...gutronix.de>,
        Woojung Huh <woojung.huh@...rochip.com>,
        UNGLinuxDriver@...rochip.com, Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     Arun Ramadoss <arun.ramadoss@...rochip.com>, kernel@...gutronix.de,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH net-next v4 4/4] net: dsa: microchip: ksz8: add MTU
 configuration support



On 11/10/2022 4:22 AM, Oleksij Rempel wrote:
> Make MTU configurable on KSZ87xx and KSZ88xx series of switches.
> 
> Before this patch, pre-configured behavior was different on different
> switch series, due to opposite meaning of the same bit:
> - KSZ87xx: Reg 4, Bit 1 - if 1, max frame size is 1532; if 0 - 1514
> - KSZ88xx: Reg 4, Bit 1 - if 1, max frame size is 1514; if 0 - 1532
> 
> Since the code was telling "... SW_LEGAL_PACKET_DISABLE, true)", I
> assume, the idea was to set max frame size to 1532.
> 
> With this patch, by setting MTU size 1500, both switch series will be
> configured to the 1532 frame limit.
> 
> This patch was tested on KSZ8873.
> 
> Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
> Acked-by: Arun Ramadoss <arun.ramadoss@...rochip.com>

Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
-- 
Florian