netdev - Re: [RFC] Virtual Machine Device Queues(VMDq) support on KVM

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Message-Id: <200909222034.28865.arnd@arndb.de>
Date:	Tue, 22 Sep 2009 20:34:28 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	"Michael S. Tsirkin" <mst@...hat.com>,
	Chris Wright <chrisw@...s-sol.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	virtualization@...ts.linux-foundation.org,
	"Xin, Xiaohui" <xiaohui.xin@...el.com>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"hpa@...or.com" <hpa@...or.com>, "mingo@...e.hu" <mingo@...e.hu>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
Subject: Re: [RFC] Virtual Machine Device Queues(VMDq) support on KVM

On Tuesday 22 September 2009, Stephen Hemminger wrote:
> > My idea for that was to open multiple file descriptors to the same
> > macvtap device and let the kernel figure out the  right thing to
> > do with that. You can do the same with raw packed sockets in case
> > of vhost_net, but I wouldn't want to add more complexity to the
> > tun/tap driver for this.
> > 
> Or get tap out of the way entirely. The packets should not have
> to go out to user space at all (see veth)

How does veth relate to that, do you mean vhost_net? With vhost_net,
you could still open multiple sockets, only the access is in the kernel.
Obviously, once it all is in the kernel, that could be done under the
covers, but I think it would be cleaner to treat vhost_net purely as
a way to bypass the syscalls for user space, with as little as possible
visible impact otherwise.

	Arnd <><
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