Re: [RFC PATCH net-next 0/4] switchdev: avoid duplicate packet forwarding

Scott Feldman
2015-06-17T07:03:01Z

On Tue, Jun 16, 2015 at 11:30 PM, Jiri Pirko <jiri@resnulli.us> wrote:

> Scott, again, I'm not talking about br0 ifindex! I'm talking about
> ifindexes of the port netdevs.
>
> br0
> sw1p1 ifindex=1
> sw1p2 ifindex=2
> sw2p1 ifindex=3
> sw2p2 ifindex=4
>
>
> now we have 2 groups, one in each switch. So for sw1 group (sw1p1 and
> sw1p2) we select mark one of the ifindexes, so either "1" or "2"
> For second group, from sw2 we select "3" or "4". So for example:
> br0
> sw1p1 mark=1
> sw1p2 mark=1
> sw2p1 mark=4
> sw2p2 mark=4
>
> This is generic, usable for every group.

Oooh, that's good. I like it. If the port is not grouped, set
mark=ifindex. Or mark=0 to have a dflt group for ungrouped ports.

Do you see a way to code this up? The only thing that comes to mind
is for the swX driver to keep track of mark picked for each bridge
brY, but I was hoping you have an idea how to do this without any
storage?