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

From: <bugzilla-noreply_at_freebsd.org>
Date: Sat, 18 Sep 2021 00:05:02 UTC

--- Comment #39 from Kevin Bowling <kbowling@freebsd.org> ---
(In reply to Jason Tubnor from comment #38)
The reason I am confused by this is I think I run a similar configuration on
Chelsio and do not need to drop the flags: 

Therefore I am wondering if we are getting something wrong on the VLAN
offloads.  If you can test with main or stable/{12,13} with the above patch I'd
be curious too.

To help me orient on this, can you provide a toy rc.conf or sequence of
ifconfig commands to build the "wrong" topology that triggers the bug?

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