[Bug 239240] igb: TX(2) desc avail = 1024, pidx = 0 messages appear when the network card (igb/ixgbe/em) loses ethernet link

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=239240

--- Comment #33 from commit-hook at freebsd.org ---
A commit references this bug:

Author: erj
Date: Thu Jan  2 23:35:06 UTC 2020
New revision: 356310
URL: https://svnweb.freebsd.org/changeset/base/356310

Log:
  iflib: Prevent watchdog from resetting idle queues

  While changing link state in iflib_link_state_change(), queues are
  marked as IFLIB_QUEUE_IDLE to disable watchdog. Currently, iflib_timer()
  watchdog does not check for previous queue status before marking it as
  IFLIB_QUEUE_HUNG.

  This patch adds check of queue status before marking it as hung.

  Signed-off-by: Piotr Pietruszewski <piotr.pietruszewski at intel.com>

  PR:           239240
  Submitted by: Piotr Pietruszewski <piotr.pietruszewski at intel.com>
  Reported by:  ultima@
  Reviewed by:  gallatin@, erj@
  MFC after:    3 days
  Sponsored by: Intel Corporation
  Differential Revision:        https://reviews.freebsd.org/D21712

Changes:
  head/sys/net/iflib.c

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