netdev - Regarding tx-nocache-copy in the Sheevaplug

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Message-ID: <20141013105246.GD1972@vicerveza.homeunix.net>
Date:	Mon, 13 Oct 2014 12:52:46 +0200
From:	Lluís Batlle i Rossell <viric@...ic.name>
To:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Cc:	Carles Pagès <page@...ata.homelinux.net>,
	linux-arm-kernel@...ts.infradead.org
Subject: Regarding tx-nocache-copy in the Sheevaplug

Hello,

on the 7th of January 2014 ths patch was applied:
https://lkml.org/lkml/2014/1/7/307

[PATCH v2] net: Do not enable tx-nocache-copy by default

In the Sheevaplug (ARM Feroceon 88FR131 from Marvell) this made packets to be
sent corrupted. I think this machine has something special about the cache.

Enabling back this tx-nocache-copy (as it used to be before the patch) the
transfers work fine again. I think that most people, encountering this problem,
completely disable the tx offload instead of enabling back this setting.

Is this an ARM kernel problem regarding this platform?

Thank you,
Lluís
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