[Bug 211713] NVME controller failure: resetting (Samsung SM961 SSD Drives)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=211713

--- Comment #50 from commit-hook at freebsd.org ---
A commit references this bug:

Author: imp
Date: Fri Mar 16 05:23:49 UTC 2018
New revision: 331046
URL: https://svnweb.freebsd.org/changeset/base/331046

Log:
  Try polling the qpairs on timeout.

  On some systems, we're getting timeouts when we use multiple queues on
  drives that work perfectly well on other systems. On a hunch, Jim
  Harris suggested I poll the completion queue when we get a timeout.
  This patch polls the completion queue if no fatal status was
  indicated. If it had pending I/O, we complete that request and
  return. Otherwise, if aborts are enabled and no fatal status, we abort
  the command and return. Otherwise we reset the card.

  This may clear up the problem, or we may see it result in lots of
  timeouts and a performance problem. Either way, we'll know the next
  step. We may also need to pay attention to the fatal status bit
  of the controller.

  PR: 211713
  Suggested by: Jim Harris
  Sponsored by: Netflix

Changes:
  head/sys/dev/nvme/nvme_private.h
  head/sys/dev/nvme/nvme_qpair.c

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