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Problem Description
=============
The udev rules for renaming the SR-IOV Mellanox CX4 VF interface are not getting
implemented. After setting the udev rules, and unbind/bind the drivers for the VF's, 
the interface name still doesn't change. Same issue isn't noticed for the PF of the
SR-IOV adapter.
 
Resolution
=======
Use static MAC addresses for renaming SRIOV Mellanox CX4 VF interfaces with udev rules.

Documentation
==========
With Mellanox CX4 SR-IOV when the VFs are created, each of them will get a random MAC address. 
To be able to use the '70-persistent-net.rules' to define interfaces based on MAC Address, one need
to set static MAC address to the VF. 

This is an example
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="02:a9:bb:cc:dd:00", NAME="enP4p1s0vf"

First execute below command 
echo 02:a9:bb:cc:dd:00 > /sys/class/infiniband/mlx5_0/device/sriov/0/mac

and then 
do the unbind/bind
echo 0004:01:00.2 > /sys/bus/pci/drivers/mlx5_core/unbind
echo 0004:01:00.2 > /sys/bus/pci/drivers/mlx5_core/bind

then one can see  
enP4p1s0vf: flags=4098<BROADCAST,MULTICAST>  mtu 1500
        ether 02:a9:bb:cc:dd:00  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

** Affects: ubuntu-docs (Ubuntu)
     Importance: Undecided
     Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage)
         Status: New


** Tags: architecture-ppc64le bugnameltc-153427 severity-low targetmilestone-inin1710
-- 
[SR-IOV]: Use static MAC addresses with udev rules for renaming VF interfaces (Mellanox CX4) (Documentation)
https://bugs.launchpad.net/bugs/1689616
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