Hi, Lukas and ADymov
Several months passed from last my post 
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My initial goal was to use VPP and Suricata like this:
[IF] → DPDK_VPP ← (memif) → DPDK_Suricata
Among DPDK_VPP and DPDK_Suricata, use memif virtual interface to transfer packets.
In my previous tests, I just tested packets which were generated by VPP packet generator, DPDK_Suricata received them sucessfully.
By the futher, I want to test the full scenario：[IF] → DPDK_VPP ← (memif) → DPDK_Suricata.
Now I found the problem, when DPDK_Suricata is launched, DPDK_VPP would not receive any packets from the physical IFs. After searched the forum, it seems to be the same problem discussed here Suricata and dpdk in secondary mode, right? Can you give any advise for me?