[Bug 228852] e1000 back-to-back unable to negotiate link...

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=228852

            Bug ID: 228852
           Summary: e1000 back-to-back unable to negotiate link...
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: seanc at FreeBSD.org

Using two back-to-back e1000 Ethernet adapters, neither NIC negotiates to up. 
The max link speed is 100baseTX but setting auto-negotiate refuses to establish
link.  This may be an MDI-X problem.

CC shurd@

% doas ifconfig em0 media 1000baseT mediaopt full-duplex
% ifconfig em0
em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
       
options=85259b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4,LRO,WOL_MAGIC,VLAN_HWFILTER,VLAN_HWTSO>
        ether 50:7b:9d:a3:d9:d0
        inet6 fe80::527b:9dff:fea3:d9d0%em0 prefixlen 64 scopeid 0x1 
        inet 0.0.0.0 netmask 0xff000000 broadcast 255.255.255.255 
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
        media: Ethernet 1000baseT <full-duplex> (autoselect)
        status: no carrier

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