I have the same issue with FreeNAS 11.1-U1. I created a bug report for FreeNAS and they are looking into it, but they were a little perplexed that a newer driver for FreeBSD was available but wasn't imported into the FreeBSD repository even though Intel is supposed to have FreeBSD committers.
02) Intel(R) Ethernet Converged Network 5.05 1572 00:005 Update
Adapter X710-2 available
I am updating the firmware now to 6.01... But I am fairly certain that will not work. From what I can see in the bug tracking and googling, this has been going on for a while and either keeps coming back or never gets fixed.
From what I can see, the responsibility is on Intel to fix this for good and get the committers to imported the latest drivers in the FreeBSD head.
Intel, can we please get a permanent fix please?
