[Bug 240658] iflib: if_igb(4) and some if_em(4) devices don't recognize/report carrier loss.

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240658

--- Comment #9 from Harald Schmalzbauer <bugzilla.freebsd at omnilan.de> ---
Update:

The link-state-change issue doesn't affect _configured_ interfaces, so the fix
in https://reviews.freebsd.org/D21769 is most likely perfectly valid.

I guess the remaining issue is by design.
As long as the interface was never configured, state change only works once in
one direction -> recorded as active.
If I have the interface configured before or afterwards, connection change/loss
will be recognized.  But not for unconfigured interfaces.
So the issue has no production influencing effects.  It's might just caus
confusion on systems with (cold) standby interfaces, since the admin might
assume there's a link active and searches all switches unsuccessfully for that
link…

During this test I saw that assigning an IP address to an already
link-established em(4) or igb(4) interface, causes loss/interruption of the
establisehd ethernet link.
Don't know if this is desired…
Guess these facts are related and as long as the internal steps configuring a
em/igb(4) (or probably iflib generic?) NIC stay as they are, it won't be
possible to catch the link state loss with unconfigured/cold-stanby interfaces,
right?

Thanks,

-Harry(In reply to John Delano from comment #7)

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