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

From: <bugzilla-noreply_at_freebsd.org>
Date: Fri, 17 Sep 2021 04:59:55 UTC

--- Comment #38 from Jason Tubnor <jason@tubnor.net> ---
(In reply to Kevin Bowling from comment #37)

Typical these features should be automatically stripped from an interfaces
feature set when the interface has been added to a bridge (which happens

ifconfig_igb0="-txcsum -txcsum6 -lro -tso up"

However, if the interface is being used as a parent for a VLAN interface, when
the VLAN is added to a bridge, the driver subset does not remove these features
from the parent interface. Causing various issues to data flows including data
not flowing at all.

The above is added in /etc/rc.conf to work around this fault in the VLAN/igb

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