We want to use shared_rxqs between PF and VF_rep. I tried to test this feature with the testpmd shared_rxq fwd. We used the "--rxq-share" option in the command line to run the testpmd. With server A, we were able to create shared_rxqs between PF and VF_rep0, but with server B we were not able to create shared_rxqs instead server B created individual RX queues on PF and VF_rep0. We confirmed this by printing the stats of both ports.  

As in mlx5 doc "Shared Rx queue: Counters of received packets and bytes number of devices in same share group are same. Counters of received packets and bytes number of queues in same group and queue ID are same."

As PF and VF_rep0 should have the same RX stats, by printing port stats server A shows the same stats on both PF and VF_rep but server B doesn't. Please review the below test configurations and port stats on both servers.

$ sudo ./build_22_07/app/dpdk-testpmd -l 0-1 -n 4 -a 0000:04:00.0,representor=vf[0] -- -i --nb-cores=1 --rxq-share=2

mlx5_common: DevX create q counter set failed errno=22 status=0 syndrome=0
mlx5_common: DevX create q counter set failed errno=22 status=0 syndrome=0

testpmd> set fwd shared_rxq

testpmd> start

SEND PACKET FROM SCAPY:

The packet sent from the wire is received on PF but port stats of both were updated correctly:

sendp(Ether()/Dot1Q(vlan=123)/IP()/UDP(),iface='enp130s0f0',count=24)

SHOW STATS ON SERVER A:

  RX-packets: 24         RX-missed: 0          RX-bytes:  1440

  TX-packets: 0          TX-errors: 0          TX-bytes:  0

  Rx-pps:            0          Rx-bps:            0

SHOW STATS ON SERVER B:

testpmd> show port stats all