Using kni for tcp stream classification

Hello.
I'm using kni with a libpcap-based program.
I will sort packets by tcp stream in kni
so the program can concentrate on the business logic.
My question is
- Is kni guaranteed to keep the packet order?
  rte_kni_tx_burst(p1)->rte_kni_tx_burst(p2)->rte_kni_tx_burst(p3)
  then I want pcap_loop() to return p1, p2, p3 in same order?
- There are many libraries in dpdk.
  What rte_libs can I use to classify tcp streams? Any examples?