netdev - Re: network devices don't handle pci_dma_mapping

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Message-ID: <20061205070045.GE3619@rhun.ibm.com>
Date:	Tue, 5 Dec 2006 09:00:45 +0200
From:	Muli Ben-Yehuda <muli@...ibm.com>
To:	Stephen Hemminger <shemminger@...l.org>
Cc:	Jeff Garzik <jeff@...zik.org>,
	"Amit S. Kale" <amitkale@...xen.com>, netdev@...r.kernel.org,
	brazilnut@...ibm.com, netxenproj@...syssoft.com, rob@...xen.com,
	romieu@...zoreil.com, sanjeev@...xen.com, wendyx@...ibm.com
Subject: Re: network devices don't handle pci_dma_mapping_error()'s

On Mon, Dec 04, 2006 at 10:39:49AM -0800, Stephen Hemminger wrote:

> I notice that no current network driver handles dma mapping errors.
> Might that be part of the problem.  On i386, this never happens, and
> it would be rare on most others.

IOMMUs are already available on x86-64 and are going to get widespread
with the the introduction of IOMMUs from Intel and AMD. Might as well
fix it now...

How about CONFIG_DEBUG_DMA_API that does book-keeping and yells if a
driver is mis-using the DMA API?

Cheers,
Muli
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