netdev - Re: [PATCH net-next] sysfs: add entry to indicate network interfaces with random MAC address

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Message-Id: <20100721.114851.200597269.davem@davemloft.net>
Date:	Wed, 21 Jul 2010 11:48:51 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	gregory.v.rose@...el.com
Cc:	leedom@...lsio.com, shemminger@...tta.com, andy@...yhouse.net,
	harald@...hat.com, bhutchings@...arflare.com, sassmann@...hat.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	gospo@...hat.com, alexander.h.duyck@...el.com
Subject: Re: [PATCH net-next] sysfs: add entry to indicate network
 interfaces with random MAC address

From: "Rose, Gregory V" <gregory.v.rose@...el.com>
Date: Wed, 21 Jul 2010 11:43:19 -0700

> Intel's view of things is that we don't use persistent MAC addresses
> in our VFs because the MAC address belongs to the VM and when it
> migrates it's going to want to use another VF with the same MAC
> address.  If they're persistent I'm wondering how that can be done.
> 
> This discussion has come about because some folks want to use the VF
> in the Host VMM.  The original design goal for Intel was that VFs
> would be assigned to VMs and that VMM vendors would want to assign
> MAC addresses with their own assigned OUI's.

If the VM itself is the "physical entity" of the system, the logical
conclusion I come to is that some kind of key should be obtained
through the VM to uniquely give the device a persistent MAC.

You could do things like have the PF controller use the root filesystem
ID label to construct the VF's MAC address, or something like that.
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