https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=249427
Aleksandr Fedorov <afedo...@freebsd.org> changed:
What |Removed |Added
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CC| |afedo...@freebsd.org
--- Comment #4 from Aleksandr Fedorov <afedo...@freebsd.org> ---
This is not the problem from bhyve side. The main problem is adding
if_tuntap(4) to if_bridge(4) with igb(4) interface. When you add an interface
without support TSO/CSUM e.t.c to if_bridge(4) which already has igb(4) with
TSO/CSUM enabled, than if_bridge(4) resets offload flags on all interfaces.
This is leads to link flap on igb(4).
So, it's work as expected, and described in if_bridge(4) manual page:
The TOE, TSO, TXCSUM and TXCSUM6 capabilities on all interfaces added to
the bridge are disabled if any of the interfaces doesn't support/enable
them. The LRO capability is always disabled. All the capabilities are
restored when the interface is removed from the bridge. Changing
capabilities at run-time may cause NIC reinit and a link flap.
As a workaround, you can turn off the offload flags on the igb(4) interface at
boot time in /etc/rc.conf
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