[Bug 239118] iflib: Panic in ether_output_frame on ESXi

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=239118

--- Comment #19 from commit-hook at freebsd.org ---
A commit references this bug:

Author: markj
Date: Mon Sep 30 15:59:08 UTC 2019
New revision: 352906
URL: https://svnweb.freebsd.org/changeset/base/352906

Log:
  Add IFLIB_SINGLE_IRQ_RX_ONLY.

  As of r347221 the iflib legacy interrupt mode setup assumes that drivers
  perform both receive and transmit processing from the interrupt handler.
  This assumption is invalid in the vmxnet3 driver, so introduce the
  IFLIB_SINGLE_IRQ_RX_ONLY flag to make iflib avoid tx processing in the
  interrupt handler.

  PR:           239118
  Reported and tested by:       Juraj Lutter <otis at sk.freebsd.org>
  Obtained from:        marius
  Reviewed by:  gallatin
  MFC after:    3 days
  Differential Revision:        https://reviews.freebsd.org/D21831

Changes:
  head/sys/dev/vmware/vmxnet3/if_vmx.c
  head/sys/net/iflib.c
  head/sys/net/iflib.h

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