netdev - Re: [net-next-2.6 PATCH 1/3] ixgbe: Fix DMA mapping/unmapping issues when HWRSC is enabled on IOMMU enabled kernels

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Date:	Fri, 26 Feb 2010 02:10:38 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	jeffrey.t.kirsher@...el.com
Cc:	netdev@...r.kernel.org, gospo@...hat.com,
	mallikarjuna.chilakala@...el.com
Subject: Re: [net-next-2.6 PATCH 1/3] ixgbe: Fix DMA mapping/unmapping
 issues when HWRSC is enabled on IOMMU enabled kernels

From: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Date: Fri, 26 Feb 2010 01:14:37 -0800

> From: Mallikarjuna R Chilakala <mallikarjuna.chilakala@...el.com>
> 
> Work around 82599 HW issue when HWRSC is enabled on IOMMU enabled
> kernels. 82599 HW is updating the header information after setting the
> descriptor to done, resulting DMA mapping/unmapping issues on IOMMU
> enabled systems. To work around the issue delay unmapping of first packet
> that carries the header information until end of packet is reached.
> 
> Signed-off-by: Mallikarjuna R Chilakala <mallikarjuna.chilakala@...el.com>
> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>

Applied.
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