netdev - Re: [PATCH] AF_VMCHANNEL address family for guest<->host communication.

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Date:	Tue, 16 Dec 2008 08:57:27 +0200
From:	Gleb Natapov <gleb@...hat.com>
To:	Evgeniy Polyakov <zbr@...emap.net>
Cc:	Anthony Liguori <anthony@...emonkey.ws>,
	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org
Subject: Re: [PATCH] AF_VMCHANNEL address family for guest<->host
	communication.

On Tue, Dec 16, 2008 at 02:45:11AM +0300, Evgeniy Polyakov wrote:
> Hi Anthony.
> 
> On Mon, Dec 15, 2008 at 05:01:14PM -0600, Anthony Liguori (anthony@...emonkey.ws) wrote:
> > Yes, and I went down the road of using a dedicated network device and 
> > using raw ethernet as the protocol.  The thing that killed that was the 
> > fact that it's not reliable.  You need something like TCP to add 
> > reliability.
> > 
> > But that's a lot of work and a bit backwards.  Use a unreliable 
> > transport but use TCP on top of it to get reliability.  Our link 
> > (virtio) is inherently reliable so why not just expose a reliable 
> > interface to userspace?
> 
> I removed original mail and did not check archive, but doesn't rx/tx
> queues of the virtio device have limited size? I do hope they have,
> which means that either your network drops packets or blocks.
> 
It blocks.

> Another approach is to implement that virtio backend with netlink based
> userspace interface (like using connector or genetlink). This does not
> differ too much from what you have with special socket family, but at
> least it does not duplicate existing functionality of
> userspace-kernelspace communications.
> 
I implemented vmchannel using connector initially (the downside is that
message can be dropped). Is this more expectable for upstream? The
implementation was 300 lines of code.

--
			Gleb.
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