[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

Rodney W. Grimes <rgrimes at FreeBSD.org> changed:

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                 CC|                            |rgrimes at FreeBSD.org

--- Comment #11 from Rodney W. Grimes <rgrimes at FreeBSD.org> ---
(In reply to P Kern from comment #10)
I believe that issue of not being able to forward pacekts through a VM using
vmx(4) with MTU >4K is that on the receive side the incoming packets are
chunked up into n * 4k pages and these do not pass through the forwarding code
correctly.

This in effect frag's the jumbo frame as it tries to traverse the router,
and I do not think the code is up to that task, nor is that a desirable
situation.

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