• Ben Greear's avatar
    mac80211: Optimize scans on current operating channel. · b23b025f
    Ben Greear authored
    This should decrease un-necessary flushes, on/off channel work,
    and channel changes in cases where the only scanned channel is
    the current operating channel.
    
    * Removes SCAN_OFF_CHANNEL flag, uses SDATA_STATE_OFFCHANNEL
      and is-scanning flags instead.
    
    * Add helper method to determine if we are currently configured
      for the operating channel.
    
    * Do no blindly go off/on channel in work.c  Instead, only call
      appropriate on/off code when we really need to change channels.
      Always enable offchannel-ps mode when starting work,
      and disable it when we are done.
    
    * Consolidate ieee80211_offchannel_stop_station and
      ieee80211_offchannel_stop_beaconing, call it
      ieee80211_offchannel_stop_vifs instead.
    
    * Accept non-beacon frames when scanning on operating channel.
    
    * Scan state machine optimized to minimize on/off channel
      transitions.  Also, when going on-channel, go ahead and
      re-enable beaconing.  We're going to be there for 200ms,
      so seems like some useful beaconing could happen.
      Always enable offchannel-ps mode when starting software
      scan, and disable it when we are done.
    
    * Grab local->mtx earlier in __ieee80211_scan_completed_finish
      so that we are protected when calling hw_config(), etc.
    
    * Pass probe-responses up the stack if scanning on local
      channel, so that mlme can take a look.
    Signed-off-by: default avatarBen Greear <greearb@candelatech.com>
    Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
    b23b025f
ieee80211_i.h 40.2 KB