• Johannes Berg's avatar
    mac80211: add time synchronisation with BSS for assoc · 8c358bcd
    Johannes Berg authored
    
    
    Some drivers (iwlegacy, iwlwifi and rt2x00) today use the
    bss_conf.last_tsf value. By itself though that value is
    completely worthless since it may be ancient. What really
    is needed is synchronisation between some device time and
    the TSF.
    
    To clarify this, rename bss_conf.last_tsf to sync_tsf and
    add sync_device_ts which is obtained from rx_status which
    gets a new field device_timestamp for this purpose. This
    is intentionally not using the mactime field since that
    is used for other things and in IBSS is expected to sync
    with the IBSS's TSF which isn't necessarily true for the
    device timestamp.
    
    Also, since we have the information and it's useful even
    before the connection has been established, give all the
    timing details to the driver before authenticating.
    Reviewed-by: default avatarEmmanuel Grumbach <emmanuel.grumbach@intel.com>
    Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
    8c358bcd
mac80211.h 150 KB