[ovs-discuss] different flow actions overlap

[Luca Mancini]

Hi Ben,
I feel like I'm missing something, my action simply stores 5 packets, but shouldn't two "buffering" flows installed on two different switches be 2 separate instances of that action, i.e. both store 5 different packets? What happens is 2 switches that use that buffering action (in two separate flows) add the packets to the same buffer.

From: Ben Pfaff<mailto:blp at ovn.org>
Sent: Monday, July 6, 2020 18:33
To: Luca Mancini<mailto:luca.mancini at outlook.com>
Cc: ovs-discuss at openvswitch.org<mailto:ovs-discuss at openvswitch.org>
Subject: Re: [ovs-discuss] different flow actions overlap

On Mon, Jul 06, 2020 at 11:08:16AM +0000, Luca Mancini wrote:
> Hello,
>
> I have two different flows on the same switch:
>
> ovs-ofctl add-flow s1 in_port=1,dl_type=2048,nw_proto=17,nw_dst=10.0.0.4,action=buffer:3
> ovs-ofctl add-flow s1 in_port=1,dl_type=2048,nw_proto=17,nw_dst=10.0.0.2,action=buffer:2
>
> these flows are supposed to buffer packets meant for the destination specified by nw_dst, and send the whole buffer as a new packet through the port specified (3 or 2) . My problem is that the packets that hit the different flows end up in the same buffer, shouldn’t hitting a different flow create a new instance of that action?
>
> If it helps diagnose the issue, the buffer action is implemented in ofproto-dpif-xlate.c, so only works in userspace.

This seems like an odd question.  "buffer" is an action that you
invented and implemented, I think, so it can only do what you made it
do.  If it's not doing what you want, then maybe your code has a bug?

I don't know what an "instance" of an action is.

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