[Bug 211643] ixgbe(4) does not reliably bring up 10G links with ZyXEL XS1920 switches

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=211643

            Bug ID: 211643
           Summary: ixgbe(4) does not reliably bring up 10G links with
                    ZyXEL XS1920 switches
           Product: Base System
           Version: 10.3-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: nwhitehorn at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

I am using ixgbe(4) with the on-board X550-T2 NIC on a SuperMicro X11SSH-CTF
motherboard, attached to a port on a ZyXEL XS1920-12 switch. The system is
running FreeBSD 10.3.

If the interface is set to autonegotiate, the port takes 2-5 minutes to bring
up the link and 99% of the time it comes up as 1 Gbit, rather than 10. Forcing
the media to 10GBase-T results in the link coming up as 10GBase-T fairly
reliably (80% of the time). It again typically takes several minutes for the
link to go up and, in the other 20% of cases, it either takes hours or the link
stays down permanently.

RHEL6.8 on the same hardware brings up the link reliably with no noticeable
delay.

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