[ovs-discuss] How to match packet-in and flow-mod via buffer_id?

[Ben Pfaff]

It won't work because flow-mod and packet-out aren't going to use the
same xid as the packet-in.

On Fri, May 13, 2016 at 12:07:58PM +0000, Ali Volkan Atli wrote:
> Currently, I can buffer packets for each flow, then send only one
> packet-in message to controllers, now I'm trying to figure out how to
> match the packet-in with flow-mod or packet-out? If I use xid to match
> packet-in and flow-mod or packet-out, does it violate specs?
> 
> - Volkan
> ________________________________________
> From: Ben Pfaff [blp at ovn.org]
> Sent: Thursday, May 12, 2016 7:27 PM
> To: Ali Volkan Atli
> Cc: discuss at openvswitch.org
> Subject: Re: [ovs-discuss] How to match packet-in and flow-mod via buffer_id?
> 
> On Thu, May 12, 2016 at 01:46:32PM +0000, Ali Volkan Atli wrote:
> > When a controller adds a table-miss flow entry with
> > instruction->action->max_lenght field set to NO_BUFFER, do I have a
> > chance to match a packet-in message and associated flow-mod message
> > via buffer_id?
> 
> I don't understand the question.
> 
> > If OvS send a packet-in message buffer_id set to a value different
> > than NO_BUFFER, does it violate the Openflow specs?
> 
> Yes, I think so.