netdev - Re: [net-next-2.6 PATCH 2/2] add ndo_set_port_profile op support for enic dynamic vnics

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Message-Id: <201005031332.34955.arnd@arndb.de>
Date:	Mon, 3 May 2010 13:32:34 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Vivek Kashyap <kashyapv@...ibm.com>
Cc:	Scott Feldman <scofeldm@...co.com>, davem@...emloft.net,
	netdev@...r.kernel.org, chrisw@...hat.com,
	Jens Osterkamp <Jens.Osterkamp@....de>
Subject: Re: [net-next-2.6 PATCH 2/2] add ndo_set_port_profile op support for enic dynamic vnics

On Monday 03 May 2010, Vivek Kashyap wrote:
> > After a successful pre-associate-with-resource-reservation step, we
> > know that the actual associate step will be both fast and successful.
> > After it completes, the VSI is known to be on the destination
> > and all traffic goes there (replacing the gratuitous ARP method we do
> > today).
> >
> > I don't think we'd ever do a pre-associate without the
> > resource-reservation, but the standard defines both. In theory,
> > we could do a pre-associate at every switch in the data center
> > in order to find out if it's possible to migrate there.
> >
> > If you want to have more details, please look at the draft spec at
> > http://www.ieee802.org/1/files/public/docs2010/bg-joint-evb-0410v1.pdf
> 
> The basic difference is that in 'pre-associate with resoruce reservation', the 
> local buffers and resources needed for the eventual 'associate' are reserved
> at the switch port.  Therefore the associate will not fail with 
> 'insufficient resources'. It might otherwise.

Yes, that's exactly what I wrote. So do you have any idea why we would
ever not want to do the resource reservation?

	Arnd
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