Public bug reported:

SRU Justification:

[Impact]
The "Speed" and "Duplex" fields displayed by ethtool should report "Unknown" 
when the link is down, but instead they continue to show "1000Mb/s" and "Full".


[Fix]
* Set the speed and duplex values reported to ethtool to unknown when the link 
is down.

[Test Case]
* Verified ethtool reports correct speed and duplex values based on link status.
  1. ethtool oob_net0
  2. ifconfig oob_net0 down
  3. ifconfig oob_net0
* Verified basic OOB interface behavior by SSHing to BlueField via OOB.

[Regression Potential]
* The fix affects BlueField 2 and BlueField 3, but the change is relatively 
small and only affects the data  that is used by ethtool.

** Affects: linux-bluefield (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2116284

Title:
  mlxbf_gige: Ethtool speed does not update based on link status

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