On 2/13/2024 2:16 PM, Ori Kam wrote: > During encapsulation of a packet, it is possible to change some > outer headers to improve flow destribution. > For example, from VXLAN RFC: > "It is recommended that the UDP source port number > be calculated using a hash of fields from the inner packet -- > one example being a hash of the inner Ethernet frame's headers. > This is to enable a level of entropy for the ECMP/load-balancing" > > The tunnel protocol defines which outer field should hold this hash, > but it doesn't define the hash calculation algorithm. > > An application that uses flow offloads gets the first few packets > (exception path) and then decides to offload the flow. > As a result, there are two > different paths that a packet from a given flow may take. > SW for the first few packets or HW for the rest. > When the packet goes through the SW, the SW encapsulates the packet > and must use the same hash calculation as the HW will do for > the rest of the packets in this flow. > > the new function rte_flow_calc_encap_hash can query the hash value > from the driver for a given packet as if the packet was passed > through the HW. > > Signed-off-by: Ori Kam <or...@nvidia.com> > Acked-by: Dariusz Sosnowski <dsosnow...@nvidia.com> >
Acked-by: Ferruh Yigit <ferruh.yi...@amd.com>
