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

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Date:   Tue, 24 May 2022 12:01:34 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Sasha Levin <sashal@...nel.org>,
        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>,
        Paolo Abeni <pabeni@...hat.com>, guoheyi@...ux.alibaba.com,
        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, 24 May 2022 20:47:51 +0200 Arnd Bergmann wrote:
> On Tue, May 24, 2022 at 8:47 PM Arnd Bergmann <arnd@...db.de> wrote:
> >
> > 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?  
> 
> 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/