Eli Cohen from Mellanox/Nvidia had a look at the back ports and approved
them:

Both patches look good to me. You can add
 
Reviewed-by: Eli Cohen <e...@nvidia.com>

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https://bugs.launchpad.net/bugs/1925452

Title:
  [Ubuntu 21.04]: net/mlx5: Fix HW spec violation configuring uplink
  (mandatory for 20.04)

Status in Ubuntu on IBM z Systems:
  Triaged
Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Focal:
  New
Status in linux source package in Groovy:
  New
Status in linux source package in Hirsute:
  In Progress

Bug description:
  With the 5.4.0-48 update for Ubuntu 20.04, the commit

  "net/mlx5e: Modify uplink state on interface up/down"

  was integrated which contains a regression for mlx5 adapters with
  older adapter firmware.

  This is the second bugfix to repair the regression, required to operate the 
adapter in switchdev mode.
  The first part was integrated via Bug 192185 - LP1921104.

  This is the upstream fix required to be backported to Ubuntu 20.04:
  
https://github.com/torvalds/linux/commit/1a73704c82ed4ee95532ac04645d02075bd1ce3d
   
  ---Additional Hardware Info---
  Mellanox ConnectX network adapter 

   
  ---uname output---
  5.4.0-73-generic
   
  ---Steps to Reproduce---
   enable switchdev mode
  try to ping external host

  Backports need to be provide for 21.04, 20.10 and 20.04 (if not
  cleanly applyable)!

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