[Intel-wired-lan] Issue with Flow Director in Kernel Source tree's i40e driver

[Kushal Gautam]

Hi:

I believe this is the right place to discuss this issue.

I am using Intel X710 NIC, and i40e driver extracted from the Kernel Source
tree v4.4.0.

I have been trying to use ethtool to add a flow rule to the incoming
packets. The command that I have been using is:

ethtool -U ens1f0 flow-type udp4 dst-port 319 action 3 loc 1
ethtool -U ens1f1 flow-type udp4 dst-port 319 action 3 loc 1

As per my understanding, this should be forwarding all the matched packets
to Queue #3. But, these packets are directed to somewhere else (the queue
number usually changes). I could see this with /proc/interrupts.

The increase in port.fdir_atr_match and stagnant port.fdir_sb_match
suggests that my sideband rule is not working as it should have.

Also, I have tried this with usual the official i40e driver. With this
driver, I can get the desired behaviour. Has anyone else encountered the
same issue with the driver from Kernel Source tree v4.4.0 ?

Despite several tweaks, I am still not able to funnel my packets to a
particular queue. Am I doing something wrong here ?

Any information on this would be very helpful.

I can provide further information, if needed.

Thanks,
Kushal.
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