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Date:	Tue, 7 Oct 2014 11:02:11 -0300
From:	Fabio Estevam <>
To:	Lothar Waßmann <>
Cc:	"" <>,
	"David S. Miller" <>,
	Russell King <>,
	Frank Li <>,
	Fabio Estevam <>,
	linux-kernel <>
Subject: Re: [PATCH] net: fec: fix regression on i.MX28 introduced by
 rx_copybreak support

Hi Lothar,

On Tue, Oct 7, 2014 at 10:19 AM, Lothar Waßmann <> wrote:
> commit 1b7bde6d659d ("net: fec: implement rx_copybreak to improve rx performance")
> introduced a regression for i.MX28. The swap_buffer() function doing
> the endian conversion of the received data on i.MX28 may access memory
> beyond the actual packet size in the DMA buffer. fec_enet_copybreak()
> does not copy those bytes, so that the last bytes of a packet may be
> filled with invalid data after swapping.
> This will likely lead to checksum errors on received packets.
> E.g. when trying to mount an NFS rootfs:
> UDP: bad checksum. From to ulen 36
> Do the byte swapping and copying to the new skb in one go if
> necessary.
> Signed-off-by: Lothar Waßmann <>

Yesterday night I was using linux-next on mx28evk and could not boot from NFS.

I haven't had a chance to debug it, but I am glad you found a fix.

Won't be able to have access to my mx28evk until Thursday to test it though.

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