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

From: David Miller <[email-masked]>
Date: Fri, 27 Mar 2009 00:53:42 -0700 (PDT)

From: Divy Le Ray <[email-masked]>
Date: Thu, 26 Mar 2009 19:39:29 -0700

> From: Divy Le Ray <[email-masked]>
> 
> 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 <[email-masked]>

Applied.