From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Miller Subject: Re: [net-next-2.6 PATCH 1/3] ixgbe: Fix DMA mapping/unmapping issues when HWRSC is enabled on IOMMU enabled kernels Date: Fri, 26 Feb 2010 02:10:38 -0800 (PST) Message-ID: <20100226.021038.163265697.davem@davemloft.net> References: <20100226091318.19796.70225.stgit@localhost.localdomain> Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Cc: netdev@vger.kernel.org, gospo@redhat.com, mallikarjuna.chilakala@intel.com To: jeffrey.t.kirsher@intel.com Return-path: Received: from 74-93-104-97-Washington.hfc.comcastbusiness.net ([74.93.104.97]:50653 "EHLO sunset.davemloft.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752278Ab0BZKKU (ORCPT ); Fri, 26 Feb 2010 05:10:20 -0500 In-Reply-To: <20100226091318.19796.70225.stgit@localhost.localdomain> Sender: netdev-owner@vger.kernel.org List-ID: From: Jeff Kirsher Date: Fri, 26 Feb 2010 01:14:37 -0800 > From: Mallikarjuna R Chilakala > > 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 > Signed-off-by: Jeff Kirsher Applied.