What about flow cookies? They're 64-bit identifiers that exist in both the Flow Mod and Flow Removed messages.
--Justin On Feb 17, 2011, at 6:50 PM, Derek Cormier wrote: > Sure, let me explain the problem. I am maintaining a copy of the flows in > memory outside of the controller (Nox). When a flow is removed, I need to > remove it from the stored flows. However, if the wildcards are not exact in > the removed message, I cannot identify exactly which flow it is. I could have > a flow with those extra fields set to 0 and I would think it's that flow > being deleted, when it's really a different one. > > Thanks, > - Derek > > On 02/18/2011 11:40 AM, Justin Pettit wrote: >> Hi, Derek. I just wanted to let you know that we're still discussing how to >> best handle this. How difficult is it from your perspective if OVS >> continued to behave in this manner? There was a time when this >> normalization was more important from a performance perspective than it is >> now, so we may be able to either stop normalizing or at least store the >> original wildcards. However, OVS has behaved this way for a long time, and >> we haven't heard other application writers have issues with it. I >> understand how it could be confusing, though. >> >> --Justin >> >> >> On Feb 16, 2011, at 1:39 AM, Justin Pettit wrote: >> >>> Okay, that makes a bit more sense. My guess is that if you look in >>> ovs-vswitchd's logs, you'll see some messages about "normalization changed >>> ofp_match". Internally, we're clearing those other wildcard bits, since >>> they're meaningless for non-IP/ARP flows (such as your flow definition with >>> ethertype of 5). I'll talk with Ben about how we want to handle this from >>> an OpenFlow-compatiblity standpoint tomorrow. >>> >>> --Justin >>> >>> >>> On Feb 16, 2011, at 12:51 AM, Derek Cormier wrote: >>> >>>> Great. I also made a mistake about the field. It was dl_type, not dl_src. >>>> It actually works fine for dl_src. >>>> >>>> - Derek >>>> >>>> On 02/16/2011 05:36 PM, Justin Pettit wrote: >>>>> No problem. Most of us are subscribed to both. :-) We'll take a look >>>>> at it in the morning, California time. I don't expect it will be a >>>>> difficult fix. >>>>> >>>>> Thanks for reporting it. >>>>> >>>>> --Justin >>>>> >>>>> >>>>> On Feb 16, 2011, at 12:26 AM, Derek Cormier wrote: >>>>> >>>>>> Now that I think about it, this should have been posted to the dev >>>>>> board. Sorry about that! >>>>>> >>>>>> - Derek >>>>>> >>>>>> _______________________________________________ >>>>>> discuss mailing list >>>>>> discuss@openvswitch.org >>>>>> http://openvswitch.org/mailman/listinfo/discuss_openvswitch.org >>>>> >> >> > _______________________________________________ discuss mailing list discuss@openvswitch.org http://openvswitch.org/mailman/listinfo/discuss_openvswitch.org
