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Date:	Tue, 27 Jul 2010 20:45:45 -0700 (PDT)
From:	David Miller <>
Subject: Re: [net-next 3/3] stmmac: fix automatic PAD/FCS stripping

From: Giuseppe CAVALLARO <>
Date: Tue, 27 Jul 2010 12:09:47 +0200

> For Simple Ethernet frames (802.2 and 802.3) the GMAC Core
> never strips pad and fcs. This means the ACS has no effect
> on IPv4/6 frames.
> The FL bits, in the RDES0, include the FCS so the driver
> has to remove it in SW.
> For 802.3 frame format with LLC or LLC-SNAP, when set the ACS
> bit, the HW strips both PAD and FCS.
> The FL bits, in the RDES0, actually represents the frame length
> already stripped.
> This patch fixes this logic within the device driver that
> erroneously removed 4byte from 802.3 frames already stripped
> corrupting the payload.
> Signed-off-by: Giuseppe Cavallaro <>

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