[Bug 230996] em/igb: Intel i210/i350: ifconfig: enabling "vlanhwtag" renders VLAN on i210/i350 NICs unusable

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230996

            Bug ID: 230996
           Summary: em/igb: Intel i210/i350: ifconfig: enabling
                    "vlanhwtag" renders VLAN on i210/i350 NICs unusable
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: ohartmann at walstatt.org

Running a small howm-brewn router with only vanilla and standard FreeBSD
on-board utilities on a PCEngines APU2C4, the built-in i210 Intel NICs stop
working when they have VLAN tags assigned and enabling "vlanhwtag" on the base
device (i.e., igb1 is the main device, igb1.10, igb1.100 and igb1.1000 are the
VLAN devices).

This phenomenon/bug seems also present on Intel i350 NIcs (I use a server with
a dual port PCIe NIC of that kind).

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