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From: Robert Watson <rwatson@FreeBSD.org>
Date: Tue, 27 Jul 2004 23:20:45 +0000 (UTC)
To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org,
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X-FreeBSD-CVS-Branch: HEAD
Subject: cvs commit: src/sys/net if.c if.h if_ethersubr.c if_var.h
 src/sys/net80211 ieee80211_output.c ieee80211_proto.c
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rwatson     2004-07-27 23:20:45 UTC

  FreeBSD src repository

  Modified files:
    sys/net              if.c if.h if_ethersubr.c if_var.h 
    sys/net80211         ieee80211_output.c ieee80211_proto.c 
  Log:
  Add a new network interface flag, IFF_NEEDSGIANT, which will allow
  device drivers to declare that the ifp->if_start() method implemented
  by the driver requires Giant in order to operate correctly.
  
  Add a 'struct task' to 'struct ifnet' that can be used to execute a
  deferred ifp->if_start() in the event that if_start needs to be called
  in a Giant-free environment.  To do this, introduce if_start(), a
  wrapper function for ifp->if_start().  If the interface can run MPSAFE,
  it directly dispatches into the interface start routine.  If it can't
  run MPSAFE, we're running with debug.mpsafenet != 0, and Giant isn't
  currently held, the task is queued to execute in a swi holding Giant
  via if_start_deferred().
  
  Modify if_handoff() to use if_start() instead of direct dispatch.
  Modify 802.11 to use if_start() instead of direct dispatch.
  
  This is intended to provide increased compatibility for non-MPSAFE
  network device drivers in the presence of Giant-free operation via
  asynchronous dispatch.  However, this commit does not mark any network
  interfaces as IFF_NEEDSGIANT.
  
  Revision  Changes    Path
  1.197     +49 -0     src/sys/net/if.c
  1.88      +1 -0      src/sys/net/if.h
  1.177     +2 -0      src/sys/net/if_ethersubr.c
  1.82      +6 -2      src/sys/net/if_var.h
  1.11      +1 -1      src/sys/net80211/ieee80211_output.c
  1.9       +1 -1      src/sys/net80211/ieee80211_proto.c