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

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Date:	Mon, 10 Sep 2007 00:05:20 +0900
From:	FUJITA Tomonori <tomof@....org>
To:	hch@...radead.org
Cc:	jeff@...zik.org, tomof@....org, open-iscsi@...glegroups.com,
	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 Sat, 8 Sep 2007 13:00:36 +0100
Christoph Hellwig <hch@...radead.org> wrote:

> On Sat, Sep 08, 2007 at 07:32:27AM -0400, Jeff Garzik wrote:
> > FUJITA Tomonori wrote:
> > >Yeah, iommu code ignores the lld limitations (the problem is that the
> > >lld limitations are in request_queue and iommu code can't access to
> > >request_queue). There is no way to tell iommu code about the lld
> > >limitations.
> > 
> > 
> > This fact very much wants fixing.
> 
> 
> Absolutely.  Unfortunately everyone wastes their time on creating workarounds
> instead of fixing the underlying problem.

Any ideas on how to fix this?

I chatted to Jens and James on this last week.

- we could just copies the lld limitations to device structure. it's
hacky but device structure already has hacky stuff.

- we could just link device structure to request_queue structure so
that iommu code can see request_queue structure.

- we could remove the lld limitations in request_queue strucutre and
have a new strucutre (something like struct io_restrictions). then
somehow we could link the new structure with request_queue and device
strucutres.
-
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