[openstack-dev] [neutron][taas] neutron ovs-agent deletes taas flows
akamyshnikova at mirantis.com
Wed Dec 16 07:43:01 UTC 2015
Sorry, that I don't see this earlier. Yes, cookies have integer values, so
we won't be able to set string there. May be we can have a reserved integer
cookie value for a project like all "1".
I won't support idea of modifying cleanup logic not to drop 0x0 cookies.
During implementation of graceful restart it was not dropped at first, but
I get rid of it as having a lot of flows not related to anything was not
desirable, so we should try to avoid it here, too.
On Wed, Dec 16, 2015 at 7:46 AM, Soichi Shigeta <
shigeta.soichi at jp.fujitsu.com> wrote:
> o) An idea to fix:
>> 1. Set "taas" stamp(*) to taas flows.
>> 2. Modify the cleanup logic in ovs-agent not to delete entries
>> stamped as "taas".
>> * Maybe a static string.
>> If we need to use a string which generated dynamically
>> (e.g. uuid), API to interact with ovs-agent is required.
> Last week I proposed to set a static string (e.g. "taas") as cookie
> of flows created by taas agent.
> But I found that the value of a cookie should not be a string,
> but an integer.
> At line 187 in
> self.agent_uuid_stamp = uuid.uuid4().int & UINT64_BITMASK
> In case of we set an integer value to cookie, coordination
> (reservation of range) is required to avoid conflict of cookies with
> other neutron sub-projects.
> As an alternative (*** short term ***) solution, my idea is:
> Modify the clean up logic in ovs agent not to delete flows whose
> "cookie = 0x0".
> Because old flows created by ovs agent have an old stamp, "cookie =
> 0x0" means it was created by other than ovs agent.
> # But, this idea has a disadvantage:
> If there are flows which have been created by older version of ovs
> agent, they can not be cleaned.
> Soichi Shigeta
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