[Bug 194311] [ixgbe] DROP_EN needs to be set early to avoid RX queue hanging

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194311

--- Comment #2 from commit-hook at freebsd.org ---
A commit references this bug:

Author: adrian
Date: Sat Oct 18 01:02:31 UTC 2014
New revision: 273244
URL: https://svnweb.freebsd.org/changeset/base/273244

Log:
  MFC r273112: Set the DROP_EN bit before the RX queue is brought up and
active.

  He noticed issues setting this bit in SRRCTL after the queue was up,
  so doing it from the sysctl handler isn't enough and may not actually
  work correctly.

  This commit doesn't remove the sysctl path or try to change its
  behaviour.  I'll talk with others about how to finish fixing that
  before I tackle that.

  PR:           kern/194311
  Submitted by: luigi
  MFC after:    3 days
  Sponsored by: Norse Corp, Inc

Changes:
_U  stable/10/
  stable/10/sys/dev/ixgbe/ixgbe.c

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