[Bug 215737] [bhyve] utilizing virtio-net truncates jumbo frames at 4084 bytes length

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=215737

--- Comment #2 from Harald Schmalzbauer <bugzilla.freebsd at omnilan.de> ---
Just a quick note:
This is not related to r321679
(https://svnweb.freebsd.org/base?view=revision&revision=321679)

>From the description I was confident that the problem was in if_vtnet(4) and
solved, but the symptoms are still exactly the same after r321679 (tested on
11.1-RELEASE).

Accidentally I first checked with vale(4) instead of if_bridge(4) and saw that
the symptom is similar, but with different numbering.
The largest frame possible with vale(4) (and if_vtnet(4) and bhyve(8)) is 2048
bytes, resulting in 2006 bytes ICMP (echo-request) payload.

I'm not sure if the problem is with if_vtnet(4) or bhyve(4).
Unfortunately I don't have the debugging skills to find the code paths myself
and not the time learning to do so :-(

Any help highly appreciated.

-harry

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