Hi Konstantin, It seems a little overkill to play with the key... The XL710 seems to be able to hash on IP fields only. It seems only a configuration issue, I'm adding i40e maintainers in CC so they can confirm? I think the i40e driver should configure XL710 to hash on IP fields for TCP and UDP when only ETH_RSS_IP is given instead of hashing to 0. That would mimic ixgbe behaviour btw.
Tom ----- Mail original ----- De: "Konstantin Ananyev" <konstantin.anan...@intel.com> À: "tom barbette" <tom.barbe...@ulg.ac.be>, "Bruce Richardson" <bruce.richard...@intel.com> Cc: dev@dpdk.org Envoyé: Lundi 6 Février 2017 13:25:59 Objet: RE: buf->hash.rss always empty with i40e Hi Tom, > > That also leave the question of how to HASH only on the IP tuple for TCP and > UDP packets? The use case is that I want all packets from the > same IP src/dst pair to be hashed to the same queue. This cannot be enforced > with a complete hash on TCP/UDP fields. > That's for IPv4 only? It was a while ago, when I looked at it, but as I remember you can achieve that by filling first 64 bits of RSS hash with some meaningful values, and keeping remaining RSS bits as zeroes. You probably can give it a quick try with testpmd. There is a nice article about similar subject: http://www.ndsl.kaist.edu/~kyoungsoo/papers/TR-symRSS.pdf Konstantin
