We use 82599 ixgbe NIC. Driver version is 3.19.1. I read 82599 data sheet in Multiple Receive Queues Command Register- MRQC it doesn't support SCTP port in RSS. So if SCTP packets with same destination and source ip but different port number. They can't be distribute to different rx queue. Because SCTP hasn't UDP fragment issue. It is more reasonable to add SCTP port in rx-flow-hash.