I have a patch prepared that adds a new group mod command OFPGC11_ADD_OR_MOD
(value 0x8000 to not conflict with standard OFPGC commands) to the openflow
header files.
When ofproto.c receives such a group_mod it checks the existence of the
referred group_id and either calls add_group() or modify_group().
To invoke the new command from ovs-ofctl I have added a commands
"write-group(s)" that act exactly as add-group(s) except that they do not throw
errors if a group already exist.
Names can of course be discussed and changed.
> -----Original Message-----
> From: Ben Pfaff [mailto:b...@ovn.org]
>
> On Wed, May 11, 2016 at 01:30:58PM +0000, Jan Scheurich wrote:
> > A simple solution to this problem would be an additional, more
> > tolerant Group Mod command (e.g. ADD_OR_MODIFY) that writes a group
> > into the group table no matter if it already existed in the switch or
> > not. A similar proposal was submitted to ONF a while ago but never
> > implemented in the OpenFlow standard
> > (https://rs.opennetworking.org/bugs/browse/EXT-41[https://rs.opennetworking.org/bugs/browse/EXT-41]).
> >
> > Would the OVS community be open to implement this additional Group
> Mod
> > command for OpenFlow protocol 1.3 and later?
>
> It would be OK with me. Maybe you should outline how you'd like to do it.
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