Hi,
I have a Mellanox Connect-X2 Rev C1 card, which was supplied by HP, HP part number 516937-B21.
Everything I have read suggests that Connect-X2 cards should work.
The card is visible and works in Ubuntu 22.04, however Opnsense 22.7 can't see the adapters.
I can't workout how old the card is, but the firmware was released in 2014, so it's not a new card.
Is anyone familiar with this card? Could it be that the drivers have been deprecated from FreeBSD?
Sorry everyone. As is so often the way, I found the answer after asking for help.
https://forum.opnsense.org/index.php?topic=21007.0