[Bug 195078] em tx_dma_fails and dropped packets

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=195078

--- Comment #5 from commit-hook at freebsd.org ---
A commit references this bug:

Author: sbruno
Date: Sun Aug 16 19:43:45 UTC 2015
New revision: 286831
URL: https://svnweb.freebsd.org/changeset/base/286831

Log:
  Increase EM_MAX_SCATTER to 64 such that the size of
em_xmit()::segs[EM_MAX_SCATTER]
  doesn't get overrun by things like NFS that can and do shove more than 32
segs when
  being used with em(4) and TSO4.

  Update tso handling code in em_xmit() with update from jhb@ in email thread:
  https://lists.freebsd.org/pipermail/freebsd-net/2014-July/039306.html

  set ifp->if_hw_tsomax, ifp->if_hw_tsomaxsegcount & ifp->if_hw_tsomaxsegsize
  to appropriate values.

  Define a TSO workaround "magic" number  of 4 that is used to avoid an
  alignment issue in hardware.

  Change a couple of integer values that were used as booleans to actual
  bool types.

  Ensure that em_enable_intr() enables the appropriate mask of interrupts
  and not just a hardcoded define of values.

  PR:        200221 199174 195078
  Differential Revision:    https://reviews.freebsd.org/D3192
  Reviewed by:    erj jhb hiren
  MFC after:    2 weeks
  Sponsored by:    Limelight Networks

Changes:
  head/sys/dev/e1000/if_em.c
  head/sys/dev/e1000/if_em.h

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