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From: "Bjoern A. Zeeb" <bz@FreeBSD.org>
Date: Sat, 6 Mar 2010 21:22:28 +0000 (UTC)
To: cvs-src-old@freebsd.org
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Subject: cvs commit: src/sys/net if_epair.c
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bz          2010-03-06 21:22:28 UTC

  FreeBSD src repository

  Modified files:
    sys/net              if_epair.c 
  Log:
  SVN rev 204805 on 2010-03-06 21:22:28Z by bz
  
  Rework reference counting in case we queue into the netisr,
  or overflow the netisr queue and fall back to the interface
  queue so that we can garuantee that the ifnet pointer stays
  valid.   Formerly we ended up with reference counts <= 0 in
  case the netisr had returned ENOBUFS.  The idea is to track
  any packet in the netisr queue and only change the refount
  on edge operations for the fallback interface queue. This
  also avoids problems in case the if_snd.ifq_len lies to us.
  
  Also rework refount assertions to make sure they trigger if
  we go below 1. Formerly a negative refence count did not
  trigger the assert as the refcount variable is u_int.
  
  Sponsored by:   ISPsystem
  MFC after:      5 days
  
  Revision  Changes    Path
  1.5       +71 -20    src/sys/net/if_epair.c