How to direct flows to specific vf queue?

Question

SR-IOV allows us to create a VF from PF, now I want to direct some flows to VF via Flow Director.

Here is ethtool help message

action N
    Specifies the Rx queue to send packets to, or some other action.
    loc N
    Specify the location/ID to insert the rule. This will overwrite any rule present in that location and will not go through any of the rule ordering process.

    delete N
    Deletes the RX classification rule with the given ID.

I'm really confused about how to set the value of action so that the flow matching filters can be directed to specific VF.

it depends upon NIC and ASIC version. what is NIC details and firmware? — Vipin Varghese, Aug 05 '20 at 07:19

score 0 · Accepted Answer · answered Aug 03 '20 at 08:03

I have found the answer in DPDK Flow Bifurcation How-to Guide (Yes, the answer is not in SR-IOV docs or Ethtool docs, orz)

example:

ethtool -N eth1 flow-type udp4 src-ip 192.0.2.2 dst-ip 198.51.100.2 \
        action $queue_index_in_VF0
ethtool -N eth1 flow-type udp4 src-ip 198.51.100.2 dst-ip 192.0.2.2 \
        action $queue_index_in_VF1

Where:

$queue_index_in_VFn: Bits 39:32 of the variable defines VF id + 1; the lower 32 bits indicates the queue index of the VF. Thus:

$queue_index_in_VF0 = (0x1 & 0xFF) << 32 + [queue index].
$queue_index_in_VF1 = (0x2 & 0xFF) << 32 + [queue index].

action value structure

How to direct flows to specific vf queue?

1 Answers1