From: Michael Chan <mchan@broadcom.com>
Date: Thu, 6 May 2010 08:58:13 +0000 (+0000)
Subject: bnx2: Add prefetches to rx path.
X-Git-Tag: v2.6.35-rc1~473^2~236
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a33fa66bcf365ffe5b79d1ae1d3582cc261ae56e;p=pandora-kernel.git

bnx2: Add prefetches to rx path.

Add prefetches of the skb and the next rx descriptor to speed up rx path.

Use prefetchw() for the skb [suggested by Eric Dumazet].

The rx descriptor is in skb->data which is mapped for streaming mode DMA.
Eric Dumazet pointed out that we should not prefetch the data before
dma_sync.  So we prefetch only if dma_sync is no_op on the system.

Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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