linux-kernel - Re: [PATCH net v4 3/3] net: ethernet: cortina: Fix MTU max setting

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Message-ID: <20231109104723.2f47d2slwkbmqctt@skbuf>
Date:   Thu, 9 Nov 2023 12:47:23 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Hans Ulli Kroll <ulli.kroll@...glemail.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Michał Mirosław <mirq-linux@...e.qmqm.pl>,
        Andrew Lunn <andrew@...n.ch>,
        linux-arm-kernel@...ts.infradead.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net v4 3/3] net: ethernet: cortina: Fix MTU max setting

On Thu, Nov 09, 2023 at 10:03:14AM +0100, Linus Walleij wrote:
> The RX max frame size is over 10000 for the Gemini ethernet,
> but the TX max frame size is actually just 2047 (0x7ff after
> checking the datasheet). Reflect this in what we offer to Linux,
> cap the MTU at the TX max frame minus ethernet headers.
> 
> We delete the code disabling the hardware checksum for large
> MTUs as netdev->mtu can no longer be larger than
> netdev->max_mtu meaning the if()-clause in gmac_fix_features()
> is never true.
> 
> Fixes: 4d5ae32f5e1e ("net: ethernet: Add a driver for Gemini gigabit ethernet")
> Reviewed-by: Andrew Lunn <andrew@...n.ch>
> Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
> ---

Reviewed-by: Vladimir Oltean <olteanv@...il.com>