On page 14 of the spec, it says that if _STRICT is used, all fields,
including the wildcards and priority, are strictly matched against the
entry, and only an identical flow is modified or removed.
- Derek
On 02/22/2011 11:04 AM, kk yap wrote:
Hi Derek,
Actually priority for exact match does not matter. So, there cannot
be two different exact match flow entries that only differ by
priority up till at least OpenFlow 1.0. That's the case I was thinking about.
Regards
KK
On 21 February 2011 17:54, Derek Cormier<derek.corm...@lab.ntt.co.jp> wrote:
Hi KK,
Thanks for posting this to the openflow-spec board. I do think the priority
should be maintained since two identical flow matches can exist with
different priorities. If one of them is removed, it could be useful to know
which one. To identify a flow uniquely, I believe you need the ofp_match&
priority (unless a cookie is used).
- Derek
On 02/22/2011 03:27 AM, kk yap wrote:
Hi,
I believe maintaining the wildcards would be enough. To me, the
following two matches are the same:
Wildcards = ALL - DL_TYPE, DL_TYPE = 5, IP_SRC = 100...
Wildcards = ALL - DL_TYPE, DL_TYPE = 5, IP_SRC = 0...
I believe Ben and Justin is saying that it is reasonable to maintain
the wildcard field. Seems like we have a working solution?
I will post this on the openflow-spec list for the words to be cleared
up. The priority field worries me a little more, such I think exact
match is normalized to priority 65535? Should that be maintained in
flow_removed? I wonder.
Regards
KK
On 21 February 2011 09:30, Ben Pfaff<b...@nicira.com> wrote:
On Sun, Feb 20, 2011 at 11:36 PM, Derek Cormier
<derek.corm...@lab.ntt.co.jp> wrote:
I see what you mean and I agree that a switch shouldn't store
unnecessary
information. But is it really a burden in this case? The wildcards are
stored in a single 32-bit integer, so no extra space is needed.
The data structure that OVS uses for classification requires that
wildcarded fields
be zeroed for efficiency reasons. In other words, storing the wildcards
isn't a
big deal, but storing nonzero values of wildcarded fields would require
extra
memory. So I'd rather not do it, although certainly it's not a huge
deal if in the
OVS has to.
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