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Date: Fri, 18 Dec 2009 17:23:44 -0600
From: Anthony Liguori <anthony@codemonkey.ws>
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Subject: Re: [Qemu-devel] ne2k_isa: how to specify a custom iobase and irq?
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To: Sebastian Herbszt <herbszt@gmx.de>
Cc: qemu-devel@nongnu.org, Gerd Hoffmann <kraxel@redhat.com>, Markus Armbruster <armbru@redhat.com>

Sebastian Herbszt wrote:
> Actually you have to else networking doesn't work at all. Without 
> specifying
> "vlan" with the "-device" syntax you end up with vlan=<null> and not 
> vlan=0
> with "info qtree".

-netdev type=tap,id=mynic -device ne2k_isa,irq=5,iobase=0x280,id=mynic

One of the changes in 0.12 allows for a network configuration that does 
not have the builtin hub (aka vlans).  This is really important for a 
number of reasons.  The main is that it allows for much more aggressive 
optimization without having to teach the vlan code how to deal with 
things like software GSO.

That might look awkward, but that's because it's designed to be used 
from a config file.  The config entry for that is:

  [device "mynic"]
    driver = "ne2k_isa"
    irq = "5"
    iobase = "0x280"

  [netdev "mynic"]
    type = "tap"

Which looks pretty nice IMHO.

Regards,

Anthony Liguori