Yes, that's true. I though about using the cookie field, but I want to
leave that open for a future use. My main concern is that it goes
against the OpenFlow protocol.
- Derek
On 02/18/2011 12:05 PM, Justin Pettit wrote:
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
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