netdev - Re: [PATCH v2.6.29 09/14] gianfar: Add macros for stepping through BDs

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Date:	Tue, 16 Dec 2008 15:33:47 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	afleming@...escale.com
Cc:	jeff@...zik.org, galak@...nel.crashing.org, netdev@...r.kernel.org
Subject: Re: [PATCH v2.6.29 09/14] gianfar: Add macros for stepping through
 BDs

From: Andy Fleming <afleming@...escale.com>
Date: Tue, 16 Dec 2008 17:21:02 -0600

> This code is based strongly on code from Dai Haruki <Dai.Haruki@...escale.com>.
> 
> The gianfar Buffer Descriptors are arranged in a circular array, the end of
> which is denoted by setting the "WRAP" bit in the descriptor.  However, the
> software knows the end of the ring because it knows how many descriptors are
> there.  Rather than check each descriptor for whether the WRAP bit is set,
> use pointer math to determine where the next BD is.  This is also useful for
> when we want to look at BDs other than the very next one (for Scatter-Gather).
> 
> Signed-off-by: Andy Fleming <afleming@...escale.com>

Applied.
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