[Bug 263756] igb interface not receiving vlan packets since 12.3

From: <bugzilla-noreply_at_freebsd.org>
Date: Tue, 03 May 2022 12:30:58 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=263756

            Bug ID: 263756
           Summary: igb interface not receiving vlan packets since 12.3
           Product: Base System
           Version: 12.3-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: sec@42.org

I have an igb interface that is receieving traffic with multiple vlans for
monitoring purposes.

On FreeBSD-12.2 (p12) "tcpdump -ni igb5" shows lots of traffic.
On FreeBSD-12.3 (p5) the same command shows no traffic.

I tried disabling all maybe relevant interface options/flags via:

ifconfig igb5 -vlanhwtag -vlanhwtso -vlanhwcsum -lro -tso -rxcsum -vlanhwfilter
-vlanmtu down; ifconfig igb5 up

But still no packets are showing up.

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