[Bug 270163] Intel 82571EB quad port adapter causing ifconfig response delays when only one interface plugged in at boot

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=270163

            Bug ID: 270163
           Summary: Intel 82571EB quad port adapter causing ifconfig
                    response delays when only one interface plugged in at
                    boot
           Product: Base System
           Version: 13.1-STABLE
          Hardware: powerpc
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: tpearson@raptorengineering.com

When using a 82571EB quad port Ethernet adapter under FreeBSD 13.1, I am
observing a persistent and significant delay in ifconfig responses if the
machine was booted without all four Ethernet ports connected and active.  This
delay shows up as ifconfig is attempting to gather media information and link
state, and lasts for ~50 seconds

Once the device enters this state, it no longer detects link state changes on
Ethernet ports that have been connected after boot.  Connecting a network cable
to the port continues to register link down, even though the card lights show
activity on that port.

Bad link state output:
        media: Ethernet autoselect
        status: no carrier

Correct link state output:
        media: Ethernet autoselect (1000baseT <full-duplex>)
        status: active

Even with all four ports connected, subsequent link state changes are not
registered.  I suspect there may be an issue communicating with the PHYs after
initial driver setup has completed.

I am using CARP on these interfaces.  Other Ethernet adapter models I have
tested do not appear to exhibit this problem.

Rarely (less than 1 in 100 chance), the system starts normally on its own and
all link state changes are reflected correctly until the next reboot.

No abnormal messages appear in dmesg.

The cards operate normally under Linux.

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