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From: Greg Law <glaw@solarflare.com>
To: Caitlin Bestler <caitlinb@broadcom.com>
Cc: xen@solarflare.com, xen-devel@lists.xensource.com
Subject: Re: RFC -- virtualisable NIC support in Xen
Date: Fri, 22 Sep 2006 12:04:38 +0100	[thread overview]
Message-ID: <4513C346.6070209@solarflare.com> (raw)
In-Reply-To: <54AD0F12E08D1541B826BE97C98F99F1A30F2F@NT-SJCA-0751.brcm.ad.broadcom.com>

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.

Hope this helps,

Greg

-- 
Greg Law               glaw@solarflare.com              +44 1223 518 040

       reply	other threads:[~2006-09-22 11:04 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <54AD0F12E08D1541B826BE97C98F99F1A30F2F@NT-SJCA-0751.brcm.ad.broadcom.com>
2006-09-22 11:04 ` Greg Law [this message]
2006-09-22 18:13   ` RFC -- virtualisable NIC support in Xen Caitlin Bestler
2006-09-27 12:53     ` Greg Law
2006-09-20 16:21 Greg Law

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