netdev - Re: [PATCH 4/9 v2] netdev: bfin_mac: deduce Ethernet FCS from hardware IP payload checksum

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Message-Id: <20100517.172145.260079154.davem@davemloft.net>
Date:	Mon, 17 May 2010 17:21:45 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	vapier@...too.org
Cc:	netdev@...r.kernel.org, uclinux-dist-devel@...ckfin.uclinux.org,
	sonic.zhang@...log.com, jon.kowal@...ecialists.de
Subject: Re: [PATCH 4/9 v2] netdev: bfin_mac: deduce Ethernet FCS from
 hardware IP payload checksum

From: Mike Frysinger <vapier@...too.org>
Date: Mon, 10 May 2010 11:39:09 -0400

> From: Sonic Zhang <sonic.zhang@...log.com>
> 
> IP checksum is based on 16-bit one's complement algorithm, so to deduce a
> value from checksum is equal to add its complement.
> 
> Unfortunately, the Blackfin on-chip MAC checksum logic only works when the
> IP packet has a header length of 20 bytes.  This is true for most IPv4
> packets, but not for IPv6 packets or IPv4 packets which use header options.
> So only use the hardware checksum when appropriate.
> 
> Signed-off-by: Sonic Zhang <sonic.zhang@...log.com>
> Signed-off-by: Jon Kowal <jon.kowal@...ecialists.de>
> Signed-off-by: Mike Frysinger <vapier@...too.org>

Applied.
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