netdev - Re: [PATCH 2.6.30 1/2] cxgb3: fix dma mapping regression

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Message-Id: <20090529.015647.51443277.davem@davemloft.net>
Date:	Fri, 29 May 2009 01:56:47 -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 1/2] cxgb3: fix dma mapping regression

From: Divy Le Ray <divy@...lsio.com>
Date: Thu, 28 May 2009 14:23:02 -0700

> From: Divy Le Ray <divy@...lsio.com>
> 
> Commit 5e68b772e6efd189d6aca76f6872fb75d51ace60
>   cxgb3: map entire Rx page, feed map+offset to Rx ring.
> 
> introduced a regression on platforms defining DECLARE_PCI_UNMAP_ADDR()
> and related macros as no-ops.
> 
> Rx descriptors are fed with the a page buffer bus address + page chunk offset.
> The page buffer bus address is set and retrieved through
> pci_unamp_addr_set(), pci_unmap_addr().
> These functions being meaningless on x86 (if CONFIG_DMA_API_DEBUG is not set).
> The HW ends up with a bogus bus address.
> 
> This patch saves the page buffer bus address for all plaftorms.
> 
> Signed-off-by: Divy Le Ray <divy@...lsio.com>

Applied.
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