netdev - Re: [E1000-devel] discussion questions: SR-IOV, virtualization, and bonding

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Message-ID: <20833.1343950602@death.nxdomain>
Date:	Thu, 02 Aug 2012 16:36:42 -0700
From:	Jay Vosburgh <fubar@...ibm.com>
To:	Chris Friesen <chris.friesen@...band.com>
cc:	"e1000-devel@...ts.sourceforge.net" 
	<e1000-devel@...ts.sourceforge.net>,
	netdev <netdev@...r.kernel.org>
Subject: Re: [E1000-devel] discussion questions: SR-IOV, virtualization, and bonding

Chris Friesen <chris.friesen@...band.com> wrote:

>On 08/02/2012 05:01 PM, Jay Vosburgh wrote:
>> Chris Friesen<chris.friesen@...band.com>  wrote:
>
>> 	Still, though, isn't "influence the guest's choice" pretty much
>> satisified by having the VF interface go carrier down in the guest when
>> the host wants it to?  Or are you thinking about more fine grained than
>> that?
>
>That was the first thing we started looking at.
>
>It would actually be better technically (since it would use the
>back-channel between PF and VFs rather than needing an explicit virtual
>network link between host/guest) but it would require work in all the
>PF/VF drivers.  We'd need to get support from all the driver maintainers.

	It might also be better (for a different definition of "better")
to use the virtual network link and do more functionality in a generic
user space piece that's not in the kernel and wouldn't require special
driver support.  Either way, I imagine there's going to have to be some
sort of message passing going on.

>The main advantage of doing it in bonding is that we'd only need to modify
>the code in one place.

	As long as it works with VLANs bonded together; that seems to be
more common these days.

	-J

---
	-Jay Vosburgh, IBM Linux Technology Center, fubar@...ibm.com

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