[Bug 233771] Intel x553 100baseTX full-duplex mode not supported

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233771

            Bug ID: 233771
           Summary: Intel x553 100baseTX full-duplex mode not supported
           Product: Base System
           Version: 11.2-RELEASE
          Hardware: arm64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: jeromecharles.lallemand at gmail.com

Hello,

The ixgbe driver for Intel X553 does not work in 100Mbps-FullDuplex.
The interface works fine in autoselect only.

ifconfig ix0 media 100baseTX mediaopt full-duplex
ifconfig: SIOCSIFMEDIA (media): Device not configured

ifconfig ix0
ix0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 9000
       
options=e53ffb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,TSO6,LRO,WOL_UCAST,WOL_MCAST,WOL_MAGIC,VLAN_HWFILTER,VLAN_HWTSO,RXCSUM_IPV6,TXCSUM_IPV6>
        ether ac:1f:6b:46...
        hwaddr ac:1f:6b:46...
        media: Ethernet autoselect
        status: no carrier


The network card is Intel X553.

The error is present in:

- 11.2-RELEASE
- 11.2-STABLE
- 12.0-RC3

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