RSS not working with QinQ packets on E810 NIC

[李明]

I'm doing some tests on E810(8086:1591) NIC using dpdk-20.11.5. 
ddp:  1.3.35.0, ICE COMMS Package 
test-configuration：
  1 E810 NIC card attached to IXIA test generator. 
   Each port has 2 rx queues assigned, dpdk_testpmd runs for test


[result]：
1. when IXIA send packets with no-vlan or 1-vlan, the RSS works fine，“show fwd stats all” indicates that all rx queues receive packets；
2. but when send packets with double-vlan，the RSS didn't work，only queue-0 receives packets.  I've tried  "vlan extend on/off"  OR "port config all rss on",etc，nothing changed.


[question]
How can I get RSS working when QinQ packets received？
many thanks if anyone can give me some hint.
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