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RE: [Xen-devel] Xen net subsystem and driver model query?

  • To: "Mark Williamson" <mark.williamson@xxxxxxxxxxxx>
  • From: "Pradeep Singh, TLS-Chennai" <pradeep_s@xxxxxx>
  • Date: Tue, 10 Apr 2007 13:01:04 +0530
  • Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
  • Delivery-date: Tue, 10 Apr 2007 01:40:06 -0700
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: Acd5NB+qTg/c/by4QX2F7VTa1iGdAACDhK5j
  • Thread-topic: [Xen-devel] Xen net subsystem and driver model query?

-----Original Message-----
From: M.A. Williamson on behalf of Mark Williamson
Sent: Sat 07-Apr-07 10:14 PM
To: Pradeep Singh, TLS-Chennai
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-devel] Xen net subsystem and driver model query?

> Xen changes employs the technique of backend and frontend drivers for
> network drivers also.Does this means Xen hypervisor code for
> networking subsystem is also heavily changed to employ this?
Xen itself doesn't include any network-related code.

The frontend driver runs in the domU kernel and just looks like an
ethernet device to the rest of Linux's networking subsystem.  The
backend device runs in the dom0 kernel and looks like a producer of
ethernet packets to the rest of the dom0 kernel...

Any modifications to the rest of the network stack to support this model
are pretty minimal.

Thanks a lot for the help.

> Any pointers to the src code files.

The drivers are in:


The principle of operation of the block front and back drivers is very



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