configuration, which is used to work around issues with certain setups
(see r161237) by default, should not be triggered as it may in turn
cause harm in some edge cases.
- Even after masking the media with IFM_GMASK the result may have bits
besides the duplex ones set so just comparing it with IFM_FDX may lead
to false negatives.
- Announce PAUSE support also for manually selected 1000BASE-T, but for
all manually selected media types only in full-duplex mode. Announce
asymmetric PAUSE support only for manually selected 1000BASE-T.
- Simplify setting the manual configuration bits to only once after we
have figured them all out. This also means we no longer unnecessarily
update the hardware along the road.
- Remove a stale comment.
Reviewed by: yongari (plus additional testing)
MFC after: 3 days