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Date:   Tue, 24 May 2022 12:01:34 -0700
From:   Jakub Kicinski <kuba@kernel.org>
To:     Arnd Bergmann <arnd@arndb.de>
Cc:     Sasha Levin <sashal@kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        "# 3.4.x" <stable@vger.kernel.org>, Joel Stanley <joel@jms.id.au>,
        David Wilder <wilder@us.ibm.com>,
        Dylan Hung <dylan_hung@aspeedtech.com>,
        "David S . Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Paolo Abeni <pabeni@redhat.com>, guoheyi@linux.alibaba.com,
        chenhao288@hisilicon.com, Networking <netdev@vger.kernel.org>
Subject: Re: [PATCH AUTOSEL 5.17 10/12] net: ftgmac100: Disable hardware
 checksum on AST2600
Message-ID: <20220524120134.2c466107@kernel.org>
In-Reply-To: <CAK8P3a2EZKnLB5c9YuKbaug16tG7juidmQ+g-wLNHx_-zxTD5A@mail.gmail.com>
References: <20220524155929.826793-1-sashal@kernel.org>
        <20220524155929.826793-10-sashal@kernel.org>
        <CAK8P3a3J6gh-0Z8JKEBDva7ox39ps5CCxJ4K7T1LyWMbTHna8Q@mail.gmail.com>
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On Tue, 24 May 2022 20:47:51 +0200 Arnd Bergmann wrote:
> On Tue, May 24, 2022 at 8:47 PM Arnd Bergmann <arnd@arndb.de> wrote:
> >
> > On Tue, May 24, 2022 at 5:59 PM Sasha Levin <sashal@kernel.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?  
> 
> Nevermind, I missed that this was a backport of a merged patch, rather
> than a new one.

Great minds think alike, tho ;)

https://lore.kernel.org/all/YowcZUX3lwAA6c5k@lunn.ch/