iflib support

[kev009]

Have a look at the iflib man pages on -CURRENT: iflibdd(9), iflibtxrx(9)

The driver should be using this for queue management and txrx. I don't see anything in the NIC design that is mutually exclusive to this.

[kev009]

cc @mattmacy

[gtzalik]

iflib is a new feature and we currently checking the implications of adding this support

[kev009]

@gtzalik thanks for checking. We will be MFCing everything to 11-STABLE and 10-STABLE in cooperation with Intel. @mattmacy has been working on small packet and forwarding performance in https://github.com/mattmacy/networking/commits/HEAD_MERGE/iflib-ixgbe-current, any concerns you have for ENA can be brought to his attention.

[alexissavin]

Support for iflib would be greatly appreciated as this would also permit to use NetMap on ENA driver in the future.