[Bug 247647] panic: page fault when opening netmap port (vmxnet3)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=247647

--- Comment #9 from commit-hook at FreeBSD.org ---
A commit references this bug:

Author: vmaffione
Date: Mon Jul 20 21:08:57 UTC 2020
New revision: 363378
URL: https://svnweb.freebsd.org/changeset/base/363378

Log:
  iflib: initialize netmap with the correct number of descriptors

  In case the network device has a RX or TX control queue, the correct
  number of TX/RX descriptors is contained in the second entry of the
  isc_ntxd (or isc_nrxd) array, rather than in the first entry.
  This case is correctly handled by iflib_device_register() and
  iflib_pseudo_register(), but not by iflib_netmap_attach().
  If the first entry is larger than the second, this can result in a
  panic. This change fixes the bug by introducing two helper functions
  that also lead to some code simplification.

  PR:   247647
  MFC after:    3 weeks
  Differential Revision:        https://reviews.freebsd.org/D25541

Changes:
  head/sys/net/iflib.c

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