• Marco Porsch's avatar
    mac80211: mesh power save basics · 3f52b7e3
    Marco Porsch authored
    Add routines to
    - maintain a PS mode for each peer and a non-peer PS mode
    - indicate own PS mode in transmitted frames
    - track neighbor STAs power modes
    - buffer frames when neighbors are in PS mode
    - add TIM and Awake Window IE to beacons
    - release frames in Mesh Peer Service Periods
    
    Add local_pm to sta_info to represent the link-specific power
    mode at this station towards the remote station. When a peer
    link is established, use the default power mode stored in mesh
    config. Update the PS status if the peering status of a neighbor
    changes.
    Maintain a mesh power mode for non-peer mesh STAs. Set the
    non-peer power mode to active mode during peering. Authenticated
    mesh peering is currently not working when either node is
    configured to be in power save mode.
    
    Indicate the current power mode in transmitted frames. Use QoS
    Nulls to indicate mesh power mode transitions.
    For performance reasons, calls to the function setting the frame
    flags are placed in HWMP routing routines, as there the STA
    pointer is already available.
    
    Add peer_pm to sta_info to represent the peer's link-specific
    power mode towards the local station. Add nonpeer_pm to
    represent the peer's power mode towards all non-peer stations.
    Track power modes based on received frames.
    
    Add the ps_data structure to ieee80211_if_mesh (for TIM map, PS
    neighbor counter and group-addressed frame buffer).
    
    Set WLAN_STA_PS flag for STA in PS mode to use the unicast frame
    buffering routines in the tx path. Update num_sta_ps to buffer
    and release group-addressed frames after DTIM beacons.
    
    Announce the awake window duration in beacons if in light or
    deep sleep mode towards any peer or non-peer. Create a TIM IE
    similarly to AP mode and add it to mesh beacons. Parse received
    Awake Window IEs and check TIM IEs for buffered frames.
    
    Release frames towards peers in mesh Peer Service Periods. Use
    the corresponding trigger frames and monitor the MPSP status.
    Append a QoS Null as trigger frame if neccessary to properly end
    the MPSP. Currently, in HT channels MPSPs behave imperfectly and
    show large delay spikes and frame losses.
    Signed-off-by: default avatarMarco Porsch <marco@cozybit.com>
    Signed-off-by: default avatarIvan Bezyazychnyy <ivan.bezyazychnyy@gmail.com>
    Signed-off-by: default avatarMike Krinkin <krinkin.m.u@gmail.com>
    Signed-off-by: default avatarMax Filippov <jcmvbkbc@gmail.com>
    Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
    3f52b7e3
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