SR-IOV virtual function setup

[Henrik Riomar]

Not sure if this is in scope for ifupdown-ng or not, opening this issue as a place to discuss it

Currently I setup vf NICs with a simple script, but it would be nice to be able to do with a file in /etc/network/interfaces.d/.

Example for creation of 5 virtual functions for eth0

        ip link set eth0 up
        echo 1 > /sys/class/net/eth0/device/sriov_drivers_autoprobe
        echo 5 > /sys/class/net/eth0/device/sriov_numvfs

After this MAC addresses can optionaly be set on each virtual function

        # set mac
        ip link set eth0 vf 0 mac 00:16:3e:8e:af:6f
        ip link set eth0 vf 1 mac 00:16:3e:b2:3f:f4
        ip link set eth0 vf 2 mac 00:16:3e:b8:c2:e0
        ip link set eth0 vf 3 mac 00:16:3e:59:be:e3
        ip link set eth0 vf 4 mac 00:16:3e:25:cb:2c

And anti-spoof filtering can be enabled as well

        # enable anti spoof filter
        ip link set eth0 vf 0 spoofchk on
        ip link set eth0 vf 1 spoofchk on
        ip link set eth0 vf 2 spoofchk on
        ip link set eth0 vf 3 spoofchk on
        ip link set eth0 vf 4 spoofchk on

Regarding MACs it would be nice to randomize them on first setup but then keep the "state" for later reboots.

How this could look

iface eth0 inet manual
    vf-numvfs <int>
    vf-drivers-autoprobe <bool>
    vf-random-mac-keep-state <bool>
    vf-spoofchk <bool>