[Bug 279352] dpaa2 (dpni0 device): interface goes catatonic periodically

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=279352

            Bug ID: 279352
           Summary: dpaa2 (dpni0 device): interface goes catatonic
                    periodically
           Product: Base System
           Version: 14.0-RELEASE
          Hardware: arm64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: arm
          Assignee: [email protected]
          Reporter: [email protected]

On my Honeycomb LX2 system the dpni0 device suddenly stops working after a
while, and the only way to get it working, short of rebooting, is to physically
flap the connection, by either pulling the ethernet cable or disabling and
re-enabling the port through the switch it's connected to.  I don't see any
logs leading up to the problem state.

Some details that may be interesting: multiple VNET jails, plus one VLAN.

I'm willing to run most any dtrace script to narrow down the problem, or test a
patch against 14.0-RELEASE to fix the problem.

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