netdev - Re: [PATCH v3 2/2][BNX2]: Add iSCSI support to BNX2 devices.

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Message-ID: <46FB6087.10306@garzik.org>
Date:	Thu, 27 Sep 2007 03:49:27 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	benh@...nel.crashing.org
CC:	FUJITA Tomonori <tomof@....org>, hare@...e.de,
	open-iscsi@...glegroups.com, hch@...radead.org,
	davem@...emloft.net, mchristi@...hat.com, netdev@...r.kernel.org,
	anilgv@...adcom.com, talm@...adcom.com, lusinsky@...adcom.com,
	uri@...adcom.com, fujita.tomonori@....ntt.co.jp
Subject: Re: [PATCH v3 2/2][BNX2]: Add iSCSI support to BNX2 devices.

Benjamin Herrenschmidt wrote:
> On Thu, 2007-09-27 at 03:31 -0400, Jeff Garzik wrote:
>> A key problem I was hoping would be solved with your work here was
>> the 
>> elimination of that post dma_map_sg() split.
>>
>> If I understood James and Ben correctly, one of the key problems was 
>> always in communicating libata's segment boundary needs to the IOMMU
>> layers?
> 
> Yup. If we can put some constraint in struct device that the dma mapping
> code can then look at ... we also need to ensure that what's passed in
> for DMA'ing already matches those constraints as well since no-iommu
> platforms will basically just keep the dma table as-is.

That's a good point...  no-iommu platforms would need to be updated to 
do the split for me.  I suppose we can steal that code from swiotlb or 
somewhere.

	Jeff



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