[Bug 240818] igb drivers: vlanhwfilter feature generate link UP/DOWN for each new vlan created

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240818

            Bug ID: 240818
           Summary: igb drivers: vlanhwfilter feature generate link
                    UP/DOWN for each new vlan created
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: olivier at freebsd.org

On 12-STALBE and -head (I didn't try with older version), creating a vlan
generate interface DOWN + UP.

Problem reproduced with I354 and I211.

How to reproduce the problem:

# ifconfig igb3.1000 create vlan 1000 vlandev igb3
igb3: link state changed to DOWN
igb3.1000: link state changed to DOWN
igb3: link state changed to UP
igb3.1000: link state changed to UP

So let's disable vlanhwfilter (this will trigger another down/up):

# ifconfig igb3 -vlanhwfilter
igb3: link state changed to DOWN
igb3.1000: link state changed to DOWN
igb3: link state changed to UP
igb3.1000: link state changed to UP


# ifconfig igb3.1100 create vlan 1100 vlandev igb3

=> No more down/up with vlanhwfilter disabled

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