Attaching backport for groovy.

repro on groovy vanilla kernel
==============================
root@pok1-qz1-sr1-rk011-s01:~# uname -a
Linux pok1-qz1-sr1-rk011-s01 5.8.0-48-generic #54 SMP Thu Mar 25 06:59:15 EDT 
2021 s390x s390x s390x GNU/Linux
root@pok1-qz1-sr1-rk011-s01:~# ifconfig p0 172.31.22.3/31 mtu 9100 up
root@pok1-qz1-sr1-rk011-s01:~# ping 172.31.22.2
PING 172.31.22.2 (172.31.22.2) 56(84) bytes of data.
^C
--- 172.31.22.2 ping statistics ---
14 packets transmitted, 0 received, 100% packet loss, time 13489ms

verify fix on groovy kernel with backport
=========================================
root@pok1-qz1-sr1-rk011-s01:~# uname -a
Linux pok1-qz1-sr1-rk011-s01 5.8.0-48-generic #54 SMP Thu Mar 25 11:16:31 EDT 
2021 s390x s390x s390x GNU/Linux
root@pok1-qz1-sr1-rk011-s01:~# ifconfig p0 172.31.22.3/31 mtu 9100 up
root@pok1-qz1-sr1-rk011-s01:~# ping 172.31.22.2
PING 172.31.22.2 (172.31.22.2) 56(84) bytes of data.   
64 bytes from 172.31.22.2: icmp_seq=2 ttl=0 time=738 ms
64 bytes from 172.31.22.2: icmp_seq=3 ttl=0 time=0.085 ms
64 bytes from 172.31.22.2: icmp_seq=4 ttl=0 time=0.073 ms
64 bytes from 172.31.22.2: icmp_seq=5 ttl=0 time=0.136 ms
64 bytes from 172.31.22.2: icmp_seq=6 ttl=0 time=0.093 ms


** Patch added: "Backport for groovy"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1921104/+attachment/5480947/+files/0001-Backport-groovy-net-mlx5e-Add-missing-capability-che.patch

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https://bugs.launchpad.net/bugs/1921104

Title:
  net/mlx5e: Add missing capability check for uplink follow  for Ubuntu
  20.04

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

Bug description:
  Expose firmware indication that it supports setting eswitch uplink state
  to follow (follow the physical link). Condition setting the eswitch
  uplink admin-state with this capability bit. Older FW may not support
  the uplink state setting.

  Available fix with kernel 5.11.
  
https://github.com/torvalds/linux/commit/9c9be85f6b59d80efe4705109c0396df18d4e11d

  Now required for Ubuntu 20.04 via backport patch.

To manage notifications about this bug go to:
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