netdev - Re: [PATCH 2.6.30 5/5] cxgb3: map entire Rx page, feed map+offset to Rx ring.

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Message-Id: <20090327.005342.73932167.davem@davemloft.net>
Date:	Fri, 27 Mar 2009 00:53:42 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	divy@...lsio.com
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	swise@...ngridcomputing.com
Subject: Re: [PATCH 2.6.30 5/5] cxgb3: map entire Rx page, feed map+offset
 to Rx ring.

From: Divy Le Ray <divy@...lsio.com>
Date: Thu, 26 Mar 2009 19:39:29 -0700

> From: Divy Le Ray <divy@...lsio.com>
> 
> 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@...lsio.com>

Applied.
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