[Bug 242023] bhyve pci_vtnet_rx broken after r354552

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=242023

--- Comment #13 from commit-hook at freebsd.org ---
A commit references this bug:

Author: vmaffione
Date: Tue Nov 19 21:10:44 UTC 2019
New revision: 354864
URL: https://svnweb.freebsd.org/changeset/base/354864

Log:
  bhyve: virtio-net: disable receive until features are negotiated

  This patch fixes a race condition where the receive callback is called
  while the device is being reset. Since the rx_merge variable may change
  during reset, the receive callback may operate inconsistently with what
  the guest expects.
  Also, get rid of the unused rx_vhdrlen variable.

  PR:   242023
  Reported by:  aleksandr.fedorov at itglobal.com
  Reviewed by:  markj, jhb
  MFC with:     r354552
  Differential Revision:        https://reviews.freebsd.org/D22440

Changes:
  head/usr.sbin/bhyve/pci_virtio_net.c

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