[Bug 264583] mlx4en(4): Mellanox ConnectX-2 10g not working in 13.1-RELEASE (fine on 13.0-RELEASE)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264583

--- Comment #2 from Mark Felder <feld@FreeBSD.org> ---
I was on firmware 2.9.1000 which was one release behind and the changelog
between that and the latest version of 2.9.1200 includes the following items
that seem likely:


---
On rare occasions, a PCIe link failure of MLNX
10GbE single and dual port card occurred due to
PCIe receiver detection failure

PCIe FunctionLevelReset occasionally failed when
the driver was down
---

In the past I had issues where sometimes I needed a clean power cycle to get
the card recognized as a normal reboot made it disappear, so for a long time I
just did a power cycle of the server when I ran updates. However, it always
worked after a clean reboot.

As of FreeBSD 13.1 it was no longer being detected after a power cycle. I had
to do many power cycles and booting into single user mode until I was lucky and
it could be detected.

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