[Date Prev] | [Thread Prev] | [Thread Next] | [Date Next] -- [Date Index] | [Thread Index] | [List Home]
Subject: Re: [PATCH v10] virtio-net: support inner header hash
On Wed, Mar 15, 2023 at 09:19:43PM +0800, Heng Qi wrote: > > Any encapsulation technology that includes UDP/L4 header likely do not > > prefer based on the inner header. This is because the outer header src > > port entropy is added based on the inner header. > > > > I was not able to follow the discussion in v9 that you had with Michael. > > Did you conclude if this is needed for vxlan too? > > > > If not, for now it may be better to skip vxlan and nvegre as they > > inherently have unique outer header UDP src port based on the inner > > header. > > Symmetric hashing ignores the order of the five-tuples when calculating the > hash, that is, using (a1,a2,p1,p2) and (a2,a1,p2,p1) respectively can > calculate the same hash. > There is a scenario that the two directions client1->client2 and > client2->client1 of the same flow may pass through different tunnels. > In order to allow the data in two directions to be processed by the same > CPU, we need to calculate a symmetric hash based on the inner packet header. > Sorry I didn't mention this earlier just to avoid introducing the concept of > symmetric hashing. But the hash is already there in the port. Is it then maybe just the question of ignoring the IP addresses when hashing? -- MST
[Date Prev] | [Thread Prev] | [Thread Next] | [Date Next] -- [Date Index] | [Thread Index] | [List Home]