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RE: [Xen-devel] RFC -- virtualisable NIC support in Xen

To: "Greg Law" <glaw@xxxxxxxxxxxxxx>
Subject: RE: [Xen-devel] RFC -- virtualisable NIC support in Xen
From: "Caitlin Bestler" <caitlinb@xxxxxxxxxxxx>
Date: Fri, 22 Sep 2006 11:13:10 -0700
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Thread-topic: [Xen-devel] RFC -- virtualisable NIC support in Xen

> -----Original Message-----
> From: Greg Law [mailto:glaw@xxxxxxxxxxxxxx] 
> Sent: Friday, September 22, 2006 4:05 AM
> To: Caitlin Bestler
> Cc: xen@xxxxxxxxxxxxxx; xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-devel] RFC -- virtualisable NIC support in Xen
> Caitlin Bestler wrote:
> > When the App/DomU posts a buffer (for TX or RX), what 
> address does it 
> > use, and how does the hardware understand it?
> It uses a "buffer address".  This is essentially an index 
> into a "buffer-table" which is stored on the NIC.  This table 
> is used to lookup physical addresses that the NIC will DMA to/from.
> The buffer-table is programmed from Dom0.
> The buffer-table is effectively our IOMMU/page-tables.

Over what scope is the buffer handle unique?

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