netdev - Re: [PATCH AUTOSEL 5.17 10/12] net: ftgmac100: Disable hardware checksum on AST2600

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Message-ID: <CAK8P3a3J6gh-0Z8JKEBDva7ox39ps5CCxJ4K7T1LyWMbTHna8Q@mail.gmail.com>
Date:   Tue, 24 May 2022 20:47:13 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Sasha Levin <sashal@...nel.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "# 3.4.x" <stable@...r.kernel.org>, Joel Stanley <joel@....id.au>,
        David Wilder <wilder@...ibm.com>,
        Dylan Hung <dylan_hung@...eedtech.com>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, guoheyi@...ux.alibaba.com,
        Arnd Bergmann <arnd@...db.de>, chenhao288@...ilicon.com,
        Networking <netdev@...r.kernel.org>
Subject: Re: [PATCH AUTOSEL 5.17 10/12] net: ftgmac100: Disable hardware
 checksum on AST2600

On Tue, May 24, 2022 at 5:59 PM Sasha Levin <sashal@...nel.org> wrote:
>
>  # ip link set mtu 1410 dev eth0
>
> The observed results:
>
>  1500 - good
>  1434 - bad
>  1400 - good
>  1410 - bad
>  1420 - good

Does it require multiples of four? Maybe it just skips the last bytes?

        Arnd