RSS (Receive Side Scaling) support on virtio vhost adapter in v1.4

General questions
,
1

This is probably not the question for VyOS particularly, but may be someone knows. I’m running VyOS 1.4 KVM guest with vhost interfaces configured like this:

    <interface type='bridge'>
      <mac address='52:54:00:b4:26:1b'/>
      <source bridge='ovsbr0'/>
      <virtualport type='openvswitch'>
        <parameters interfaceid='7002497c-4352-4da9-a686-c039135d5348'/>
      </virtualport>
      <target dev='eth1'/>
      <model type='virtio'/>
      <driver name='vhost' queues='8' rx_queue_size='1024' tx_queue_size='1024'/>
      <alias name='net1'/>
      <address type='pci' domain='0x0000' bus='0x07' slot='0x00' function='0x0'/>
    </interface>

The guest VyOS node shows multiqueue support for the interface:

$ ethtool -l eth1
Channel parameters for eth1:
Pre-set maximums:
RX:             n/a
TX:             n/a
Other:          n/a
Combined:       8
Current hardware settings:
RX:             n/a
TX:             n/a
Other:          n/a
Combined:       8

But the incoming traffic is being processed by the only one queue:

$ ethtool -S eth1|egrep "rx_queue_._packets"
     rx_queue_0_packets: 0
     rx_queue_1_packets: 0
     rx_queue_2_packets: 0
     rx_queue_3_packets: 1187
     rx_queue_4_packets: 0
     rx_queue_5_packets: 0
     rx_queue_6_packets: 0
     rx_queue_7_packets: 1870640

I was told that RSS support is something new for the virtio, but here we have 6.1.36 on guest VyOS system. Do you know guys if there is a way to tell whether RSS should be supported by virtio vhost adapters or not? And if yes - which kernel version or/and probably qemu version?

Thank you,
Alex