netdev - Re: [PATCH v2 0/3] Fix Ethernet jumbo frames support for Armada 370 and 38x

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Message-ID: <20150617172217.GY4853@kw.sim.vm.gnt>
Date:	Wed, 17 Jun 2015 19:22:17 +0200
From:	Simon Guinot <simon.guinot@...uanux.org>
To:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
Cc:	Andrew Lunn <andrew@...n.ch>, Jason Cooper <jason@...edaemon.net>,
	netdev@...r.kernel.org, Vincent Donnefort <vdonnefort@...il.com>,
	Gregory Clement <gregory.clement@...e-electrons.com>,
	linux-arm-kernel@...ts.infradead.org,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Subject: Re: [PATCH v2 0/3] Fix Ethernet jumbo frames support for Armada 370
 and 38x

On Wed, Jun 17, 2015 at 05:24:58PM +0200, Thomas Petazzoni wrote:
> Dear Simon Guinot,
> 
> On Wed, 17 Jun 2015 15:19:19 +0200, Simon Guinot wrote:
> 
> > This patch series fixes the Ethernet jumbo frames support for the SoCs
> > Armada 370, 380 and 385. Unlike Armada XP, the Ethernet controller for
> > this SoCs don't support TCP/IP checksumming with a frame size larger
> > than 1600 bytes.
> > 
> > This patches should be applied to the -stable kernels 3.8 and onwards.
> 
> You should add a Fixes: tag to each commit to indicate which commit is
> being fixed by your patches.
> 
> Also, I was a bit surprised by your statement that Armada 38x is also
> affected by the problem, since Armada 38x is more recent than Armada
> XP. but indeed, according to the Armada 38x datasheet:
> 
>   IPv4 and TCP/UDP over IPv4/IPv6 checksum generation on transmit
>   frames for standard Ethernet packet size
> 
> While the Armada XP datasheet says:
> 
>   Long frames transmission (including jumbo frames), with
>   IPv4/v6/TCP/UDP checksum generation
> 
> So it seems like you're right about this!

At first, I though this was an error in the Armada 38x datasheet (maybe
a sloppy copy/paster). Therefore I have checked on an DB-88F6820-GP
board and then I can confirm that the Armada 38x is also affected.

Simon

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