if_em(4) carrier loss event not recognized with i217; while 82574 does recognize

[Harry Schmalzbauer]

Am 11.05.2018 um 19:26 schrieb Harry Schmalzbauer:
>   Bezüglich Harry Schmalzbauer's Nachricht vom 10.05.2018 21:17 (localtime):
>>   Hello,
>>
>> if I pull the TP connection from my i217 Clarkville, HEAD still reports
>> media
>> 1000Base-T status "active".
>>
>> Doing the same with the other if_em(4) NIC in that box, a hartwell,
>> 82574LM, the status correctly changes to "no carrier".
>>
>> This is not iflib related, since it's reproducable with FreeBSD
>> 11-stable (some months old).
>>
>> Shall I file a PR?
> Not reproducable anymore with r333469.

Not sure if that post was correct.

Please see https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240658
12.1-PRERELEASE showes exaclty the same problem with a i211 (Powerville) 
MAC, while not reproducable with a i350.

Thanks,

-harry