[Bug 207446] Hang bringing up vtnet(4) on >8 cpu GCE VMs

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=207446

Steven Hartland <smh at FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |smh at FreeBSD.org

--- Comment #8 from Steven Hartland <smh at FreeBSD.org> ---
Created attachment 171249
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=171249&action=edit
Fix vtnet hang with max_virtqueue_pairs > VTNET_MAX_QUEUE_PAIRS

While the analysis seems sound the patch to add vt_device_max_vq_pairs doesn't
seem like the right thing to me.

I believe the block which limits the max queues in vtnet_setup_features should
be used to limit npairs passed to vtnet_ctrl_mq_cmd, so something like the
attached (untested).

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