From: Divy Le Ray <divy@chelsio.com>
Date: Thu, 26 Mar 2009 16:39:29 +0000 (+0000)
Subject: cxgb3: map entire Rx page, feed map+offset to Rx ring.
X-Git-Tag: v2.6.30-rc1~642^2~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5e68b772e6efd189d6aca76f6872fb75d51ace60;p=pandora-kernel.git

cxgb3: map entire Rx page, feed map+offset to Rx ring.

DMA mapping can be expensive in the presence of iommus.
Reduce the Rx iommu activity by mapping an entire page, and provide the H/W
the mapped address + offset of the current page chunk.
Reserve bits at the end of the page to track mapping references, so the page
can be unmapped.

Signed-off-by: Divy Le Ray <divy@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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