[Bug 262316] em(4) does not autonegotiate when fixed media is set

From: <bugzilla-noreply_at_freebsd.org>
Date: Thu, 03 Mar 2022 16:36:50 UTC

J.R. Oldroyd <fbsd@opal.com> changed:

           What    |Removed                     |Added
         Resolution|Not A Bug                   |---
             Status|Closed                      |Open

--- Comment #2 from J.R. Oldroyd <fbsd@opal.com> ---
Stefan, I believe you are mis-reading the standard.

You are quoting what the standard says to do in the event of autonegotiation
failure.  In that event, setting half-duplex is indeed the required behavior.

However, citing from the same article that you cited, "The Ethernet standards
and major Ethernet equipment manufacturers recommend enabling autonegotiation."

If both ends of a link are not under common administrative control, it may not
be possible to set both ends to matching modes.  Clearly, having a device
inform the other end what its configured capabilities are is preferable to
having a non-working link.

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