Ben, Oh I din’t come up with this idea. Thanks a lot!
As to the current Engine ID and Engine Type, I agree with you. There must be a better way, or simply defaults to 0 regardless to the type of datapath as we can explicitly set these values anyway. Regards, — Motonori Shindo 2014/11/27 1:53、Ben Pfaff <b...@nicira.com> のメール： > On Wed, Nov 26, 2014 at 11:01:57PM +0900, Motonori Shindo wrote: >> Is there any way to know the ifindex of datapath (ova-system) by using >> ovs-vsctl/dpctl/appctl ? > > "cat /sys/class/net/ovs-system/ifindex" will show you, although I > understand it is not one of the tools you mention. > >> I also noticed that switch.xml says: >> >> <column name="engine_id"> >> Engine ID to use in NetFlow messages. Defaults to datapath index >> if not specified. >> </column> >> >> <column name="engine_type"> >> Engine type to use in NetFlow messages. Defaults to datapath >> index if not specified. >> </column> >> >> but this is only true in the case of netlink. If OVS is run in user >> space these are derived from the hash based on datapath name, I think. > > Here's some better documentation of the current situation, but the > current situation just looks crazy to me. I think we should probably do > something different: > > <column name="engine_id"> > Engine ID to use in NetFlow messages. The value used depends on > the datapath in use. Kernel-based datapaths use the ifindex of > the datapath device, e.g. the ifindex of <code>ovs-system</code> > (this can change from one boot to the next or even more often if > the Open vSwitch kernel module is unloaded and reloaded or if > the datapath is otherwise deleted). The userspace datapath uses > 8 bits of an internally generated hash of the datapath name (for > a given Open vSwitch architecture and version, this is a > constant). > </column> > > <column name="engine_type"> > Engine type to use in NetFlow messages. The value used depends > on the datapath in use. Kernel-based datapaths use the ifindex > of the datapath device (the same value as <ref > column="engine_id"/>. The userspace datapath uses 8 bits of an > internally generated hash of the datapath name (but the bits > used are different from <ref column="engine_id"/>. > </column> _______________________________________________ discuss mailing list discuss@openvswitch.org http://openvswitch.org/mailman/listinfo/discuss
