Could someone perhaps have a look at the latest version of the patch? Thanks a lot, Jan
On Sat, 21 May 2016 00:42:49 +0200 Jan Scheurich <jan.scheur...@web.de> wrote: > *** Reposting the patch once more. First two attempts got corrupted > *** *** Sorry, still trying to find a suitable email client *** > > This patch adds support for a new Group Mod command OFPGC_ADD_OR_MOD > to OVS for all OpenFlow versions supporting groups (OF11 and higher). > The new ADD_OR_MOD creates a group that does not yet exist (like ADD) > or modifies an existing group (like MODIFY). > > Rational: In OpenFlow 1.x the Group Mod commands OFPGC_ADD and > OFPGC_MODIFY have strict semantics: ADD fails if the group exists, > while MODIFY fails if the group does not exist. This requires a > controller to exactly know the state of the switch when programming a > group in order not run the risk of getting an OFP Error message in > response. This is hard to achieve and maintain at all times in view of > possible switch and controller restarts or other connection losses > between switch and controller. > > Due to the un-acknowledged nature of the Group Mod message programming > groups safely and efficiently at the same time is virtually impossible > as the controller has to either query the existence of the group prior > to each Group Mod message or to insert a Barrier Request/Reply after > every group to be sure that no Error can be received at a later stage > and require a complicated roll-back of any dependent actions taken > between the failed Group Mod and the Error. > > In the ovs-ofctl command line the new Group Mod command is made > available in form of new write-group(s) commands that can be used in > the same way as add-group(s) but do not lead to an error when a groups > exists: > > ovs-ofctl -Oopenflow13 del-groups br-int group_id=100 > > ovs-ofctl -Oopenflow13 write-group br-int > group_id=100,type=indirect,bucket=actions=2 ovs-ofctl -Oopenflow13 > dump-groups br-int OFPST_GROUP_DESC reply (OF1.3) (xid=0x2): > group_id=100,type=indirect,bucket=actions=output:2 > > ovs-ofctl -Oopenflow13 write-group br-int > group_id=100,type=indirect,bucket=actions=3 ovs-ofctl -Oopenflow13 > dump-groups br-int OFPST_GROUP_DESC reply (OF1.3) (xid=0x2): > group_id=100,type=indirect,bucket=actions=output:3 > > _______________________________________________ dev mailing list dev@openvswitch.org http://openvswitch.org/mailman/listinfo/dev
