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

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Message-Id: <1190880779.6158.0.camel@pasglop>
Date:	Thu, 27 Sep 2007 18:12:59 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Jeff Garzik <jeff@...zik.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.


On Thu, 2007-09-27 at 03:49 -0400, Jeff Garzik wrote:
> 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.

Doing the split means being able to grow the sglist... which the dma_*
calls can't do at least not in their current form.

Ben.


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