How to add ntuple filter with different masks?

Hi.

We are trying add different ntuple rules with different masks but nic doesn't allow to do so.

For example:

ethtool -N enp7s0f1 flow-type tcp4 src-ip 172.16.0.0 m 0.0.255.255 action -1

After adding above rule, when i try adding another rule with different mask, i get error

ethtool -N enp7s0f1 flow-type tcp4 src-ip 192.168.0.0 m 0.0.0.255 action -1

I got this error

rmgr: Cannot insert RX class rule: Invalid argument

and that error on dmesg

ixgbe 0000:07:00.1 enp7s0f1: Only one mask supported per port

And this is also valid for src-ip dst-ip src-port dst-port pairs. I can add a rule only if  it has same mask for all options.

These are properties of my test machine.

Ethernet controller: Intel Corporation 82599ES 10-Gigabit SFI/SFP+ Network Connection (rev 01)

Kernel version: 3.15.9

ixgbe version: 4.0.1-k-rh7.1

OS: Centos 7

ethtool version: 3.8 (also tried with 3.18)

I wonder if there is a solution for that? Is it because of nic capability? or can it be fixed by recompiling driver with an option? etc.

Thanks for any help.