[Bug 248494] if_vmx(4) duplicate packets in netmap mode

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=248494

--- Comment #7 from commit-hook at FreeBSD.org ---
A commit references this bug:

Author: vmaffione
Date: Fri Aug 21 07:52:57 UTC 2020
New revision: 364451
URL: https://svnweb.freebsd.org/changeset/base/364451

Log:
  MFC r363996

  iflib: netmap: don't increment ifl_cidx on the wrong free list

  Netmap only uses free list 0 to keep it consistent with its
  one-to-one mapping between each netmap ring and a device RX
  (or TX) queue.
  However, the current iflib_netmap_rxsync() routine was
  mistakenly updating the ifl_cidx field of both free lists.

  PR:           248494

Changes:
_U  stable/12/
  stable/12/sys/net/iflib.c

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