This is now resolved for us.
Nov 5 2021
Oct 28 2021
Yep, that's fine - what's the best way the details over to you?
Oct 27 2021
We've now built a test x710 box for this, so we can test this more easily.
Oct 15 2021
Sorry for the late reply, I've been waiting for a maintenance window to test this in. Again as this is a production device I only have limited debug info before having to roll back to the working version. I installed 1.4-rolling-202110150613 and on booting show interfaces does indeed show all the interfaces. The igb driver interfaces were showing as up (u/u). The i40e interfaces were showing as down (u/D).
Sep 6 2021
We tested this on 1.4-rolling-202103040218 on our router, unfortunately as this is a production device I couldn't spend long diagnosing this. After upgrading the system image the device didn't come back up (I have layer 2 connectivity to the device via a VLAN on eth1 normally). So I logged in via our serial console and did a show interfaces
May 26 2021
We are seeing this on an X722 NIC that's still the i40e driver (the server in question also has an X710 NIC, but there's no cables connected to the X710 but I should be able to get cables connected to the X710 next week). We are using 1.4 on this machine.