netdev - Re: [rfc] Merging the Open vSwitch datapath

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Message-ID: <20100831010103.GH11594@verge.net.au>
Date:	Tue, 31 Aug 2010 10:01:06 +0900
From:	Simon Horman <horms@...ge.net.au>
To:	Chris Wright <chrisw@...s-sol.org>
Cc:	"Rose, Gregory V" <gregory.v.rose@...el.com>,
	Ben Pfaff <blp@...ira.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Jesse Gross <jesse@...ira.com>,
	Stephen Hemminger <shemminger@...ux-foundation.org>,
	Herbert Xu <herbert@...dor.hengli.com.au>,
	Arnd Bergmann <arnd@...db.de>,
	David Miller <davem@...emloft.net>
Subject: Re: [rfc] Merging the Open vSwitch datapath

On Mon, Aug 30, 2010 at 05:54:10PM -0700, Chris Wright wrote:
> * Simon Horman (horms@...ge.net.au) wrote:
> > On Mon, Aug 30, 2010 at 01:59:07PM -0700, Chris Wright wrote:
> > > * Rose, Gregory V (gregory.v.rose@...el.com) wrote:
> > > > >From: Ben Pfaff [mailto:blp@...ira.com]
> > > > >On Mon, Aug 30, 2010 at 11:26:17AM -0700, Rose, Gregory V wrote:
> > > > >> I just want to put in a plug for the netlink interface.  For NICs with
> > > > >> EVB we'll need it.
> > > > >
> > > > >Off-hand, the main reasons to use Netlink, instead of the existing
> > > > >character device interface, are that Netlink is easier to extend and
> > > > >that it should reduce or eliminate the 32-to-64 bit compat layer
> > > > >currently in the Open vSwitch tree.
> > > 
> > > That, plus it's a typical way to do network configuration.  Esp. with
> > > bi-directional communication.  So the userspace bit both listens to
> > > netlink messages, like any of the routing daemons or lldpad or similar
> > > do, and sends netlink messasges to update driver's flow table.
> > > 
> > > BTW, this kind of discussion was why Herbert felt strongly against
> > > drivers/staging/.  He wanted to be sure the interfaces were well-defined
> > > first.
> > 
> > Is the implication that there is a preference for finalising
> > the interface (as much as that is possible) before merging?
> 
> I'll let Herbert chime in, just reminder that was his thought earlier
> this month at LinuxCon.

Thanks, I must confess that had slipped my mind.

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