On 17 December 2014 at 09:14, Alexandru Badicioiu < [email protected]> wrote: > > Could you please clarify the following : > "Implementations are free to define flow signatures however they wish. > The only API requirement is that the same packet produce the same > signature." > Using the previously agreed terminology, this should read "Implementations are free to define flow hashes however they wish". This is what Petri meant by saying some platforms may use "weak" hashes (don't remember his exact words).
> Is the requirement that for a given packet, the flow signature is the same > for any platform conforming to ODP specs? > The flow hash for a given packet can differ between different ODP implementations. If we require the same flow hash value to be computed, we would have to define how to compute it. And we are not. Thanks, > Alex > > > > > On 16 December 2014 at 19:10, Ola Liljedahl <[email protected]> > wrote: >> >> On 16 December 2014 at 17:54, Bill Fischofer <[email protected]> >> wrote: >>> >>> Thanks to all who participated in today's ODP call. As discussed there >>> will be a call next Tuesday, December 23rd, however there will be no call >>> on Tuesday, December 30th, due to the end of year holidays. Calls in 2015 >>> will resume on Tuesday, January 6th. >>> >>> Highlights from today's discussions: >>> >>> - ODP v0.5 tagged today. This is a major milestone on the road to >>> ODP v1.0. Thanks to all who contributed to it. >>> >>> >>> - ODP v0.6 targeted for next week (Monday) >>> >>> >>> - Discussed classification questions from Freescale. >>> Implementations are free to define flow signatures however they wish. >>> The >>> only API requirement is that the same packet produce the same signature. >>> >>> We defined the related terminology back in June. Someone even documented >> this, either in a Google doc or photographically. Below is what I remember. >> >> flow signature != flow hash >> >> The application specifies the flow signature (e.g. when programming the >> classifier). The flow signature consists of selected L2/L3/L4 (etc) fields >> (a variable number of bits) as specified by the application and supported >> by the implementation. The flow signature uniquely identifies a flow, i.e. >> all packets with the same flow signature belong to the same flow and must >> be put on the same queue (by the classifier). >> >> The implementation may use a flow hash for simplified processing. The >> flow hash is computed from the flow signature and compresses it down to >> some fixed suitable size, e.g. 32 bits. The flow hash does not uniquely >> identify a flow but possibly the risk for collisions is low. It is the >> application's responsibility to make sure packets with the same flow hash >> are processed properly, e.g. mapped to the corresponding flow context >> (state associated with the flow). >> >> I don't see any reason for not using these definitions of flow signature >> and flow hash. >> >> >>> - Synchronizer test questions and discussion. Barry and Mario to >>> resolve outstanding packaging questions and post final patches this week. >>> >>> >>> - Crypto event RFC discussion. Robbie has posted v3 of his patch. >>> Review comments expected. >>> >>> >>> - Positioning for introduction of strong typing for ODP abstract >>> types. Implementations and applications should avoid use of C comparator >>> operators. Patch will be forthcoming with proposed handle comparison and >>> display APIs. >>> >>> Bill >>> >>> ---------- Forwarded message ---------- >>> From: UberConference <[email protected]> >>> Date: Tue, Dec 16, 2014 at 10:09 AM >>> Subject: Weekly ODP Design Discussion Call - Call Summary >>> To: [email protected] >>> >>> >>> >>> >>> Weekly ODP Design Discussion Call >>> December 16, 7:58AM - 9:07AM MST >>> 69 minutes >>> Shared Files Chat Transcript >>> <http://www.uberconference.com/chatdownload/6105455928016896> Recording >>> #1 >>> <http://www.uberconference.com/getmp3/AMIfv948IJu4HYs7M95-nS7jW_VzdecRIKVzu2WbTj0EXcnzfEG7RXU7xqxMkmNHsobs3hyQH_L1TTSupGXyZ9qhgkQK7CJyTAE7nJGtPHpLKTje5O6CcdAGSL8JYTmJ-H5SzaEO0FCwry-vAdHEG31BcH40Alfb0A.mp3> >>> 44.9 MB >>> ------------------------------ >>> Participants >>> In order of appearance >>> Stuart Haslam >>> 7:58AM - 9:07AM >>> 1 min >>> Bill Fischofer >>> 7:58AM - 9:05AM >>> 15 min >>> Arm Inc >>> 8:00AM - 9:05AM >>> 1 min >>> Barry Spinney >>> 8:01AM - 9:05AM >>> >>> 8 min >>> <https://plus.google.com/104842017912892599536> >>> Mike Holmes >>> 8:01AM - 9:07AM >>> 2 min >>> <https://plus.google.com/117524006040986883990> >>> Leonard Bush >>> 8:01AM - 9:05AM >>> >>> 0 min >>> Taras Kondratiuk >>> 8:01AM - 9:05AM >>> 1 min >>> <https://plus.google.com/107577698119732590769> >>> Ola Liljedahl >>> 8:02AM - 9:05AM >>> 2 min >>> Cisco Systems >>> 8:02AM - 9:05AM >>> >>> 8 min >>> Jerin Jacob >>> 8:02AM - 9:05AM >>> 1 min >>> <http://www.linkedin.com/in/jerinjacob> >>> <https://plus.google.com/112192941551127946856> >>> Anders Roxell >>> 8:02AM - 8:59AM >>> 0 min >>> <https://plus.google.com/104412829600273375417> >>> Maxim Uvarov >>> 8:02AM - 9:05AM >>> 0 min >>> <https://plus.google.com/107909139112066426665> >>> Ciprian Barbu >>> 8:03AM - 8:32AM >>> >>> 8 min >>> <https://plus.google.com/116074040956370734345> >>> Marshall Guillory >>> 8:03AM - 9:05AM >>> 0 min >>> <http://www.linkedin.com/in/marshallguillory> >>> <https://plus.google.com/111357621776735070930> >>> Kari Sundback >>> 8:03AM - 9:05AM >>> >>> 7 min >>> Bala Manoharan >>> 8:03AM - 8:19AM >>> 0 min >>> <https://plus.google.com/101798775278741634979> >>> Kamensky Victor >>> 8:05AM - 9:05AM >>> >>> 0 min >>> Gilad Ben-Yossef >>> 8:07AM - 9:04AM >>> +972 4-959-6666 >>> 0 min >>> <http://www.linkedin.com/in/giladby> >>> Job >>> 8:08AM - 8:09AM >>> 0 min >>> Raj Murali >>> 8:09AM - 9:05AM >>> 0 min >>> <https://plus.google.com/101661069368932371920> >>> Job >>> 8:10AM - 8:12AM >>> 0 min >>> Job >>> 8:13AM - 9:05AM >>> 0 min >>> Bala Manoharan >>> 8:20AM - 9:05AM >>> 2 min >>> <https://plus.google.com/101798775278741634979> >>> 702-913-1399 >>> 8:28AM - 8:29AM >>> >>> 0 min >>> Ciprian Barbu >>> 8:30AM - 9:05AM >>> >>> 0 min >>> <https://plus.google.com/116074040956370734345> >>> 40213052000 >>> 8:32AM - 9:05AM >>> >>> 3 min >>> Tip: Social profile Get to know your conference >>> participants by clicking on their social profiles. >>> Learn More >>> >>> <https://uberconference.zendesk.com/entries/22586117-Integrated-Social-Profiles> >>> UberConference >>> If you'd like to stop getting emails from UberConference, click here >>> <http://www.uberconference.com/unsubscribe/LLvfhTQDtLP9qpEQ3y3qFART3suxGq> >>> >>> _______________________________________________ >>> lng-odp mailing list >>> [email protected] >>> http://lists.linaro.org/mailman/listinfo/lng-odp >>> >>> >> _______________________________________________ >> lng-odp mailing list >> [email protected] >> http://lists.linaro.org/mailman/listinfo/lng-odp >> >>
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