mac80211: add radar detection command/event

Add command to trigger radar detection in the driver/FW.
Once radar detection is started it should continuously
monitor for radars as long as the channel active.
If radar is detected usermode notified with 'radar
detected' event.

Scanning and remain on channel functionality must be disabled
while doing radar detection/scanning, and vice versa.

Based on original patch by Victor Goldenshtein <victorg@ti.com>

Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 0eaa9092364b..7241962f9f13 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -147,10 +147,12 @@ struct ieee80211_low_level_stats {
  * enum ieee80211_chanctx_change - change flag for channel context
  * @IEEE80211_CHANCTX_CHANGE_WIDTH: The channel width changed
  * @IEEE80211_CHANCTX_CHANGE_RX_CHAINS: The number of RX chains changed
+ * @IEEE80211_CHANCTX_CHANGE_RADAR: radar detection flag changed
  */
 enum ieee80211_chanctx_change {
         IEEE80211_CHANCTX_CHANGE_WIDTH          = BIT(0),
         IEEE80211_CHANCTX_CHANGE_RX_CHAINS      = BIT(1),
+        IEEE80211_CHANCTX_CHANGE_RADAR          = BIT(2),
 };
 
 /**
@@ -165,6 +167,7 @@ enum ieee80211_chanctx_change {
  * @rx_chains_dynamic: The number of RX chains that must be enabled
  *      after RTS/CTS handshake to receive SMPS MIMO transmissions;
  *      this will always be >= @rx_chains_static.
+ * @radar_enabled: whether radar detection is enabled on this channel.
  * @drv_priv: data area for driver use, will always be aligned to
  *      sizeof(void *), size is determined in hw information.
  */
@@ -173,6 +176,8 @@ struct ieee80211_chanctx_conf {
 
         u8 rx_chains_static, rx_chains_dynamic;
 
+        bool radar_enabled;
+
         u8 drv_priv[0] __aligned(sizeof(void *));
 };
 
@@ -967,6 +972,7 @@ enum ieee80211_smps_mode {
  *
  * @channel: the channel to tune to
  * @channel_type: the channel (HT) type
+ * @radar_enabled: whether radar detection is enabled
  *
  * @long_frame_max_tx_count: Maximum number of transmissions for a "long" frame
  *    (a frame not RTS protected), called "dot11LongRetryLimit" in 802.11,
@@ -993,6 +999,7 @@ struct ieee80211_conf {
 
         struct ieee80211_channel *channel;
         enum nl80211_channel_type channel_type;
+        bool radar_enabled;
         enum ieee80211_smps_mode smps_mode;
 };
 
@@ -3945,6 +3952,13 @@ void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
                                gfp_t gfp);
 
 /**
+ * ieee80211_radar_detected - inform that a radar was detected
+ *
+ * @hw: pointer as obtained from ieee80211_alloc_hw()
+ */
+void ieee80211_radar_detected(struct ieee80211_hw *hw);
+
+/**
  * ieee80211_chswitch_done - Complete channel switch process
  * @vif: &struct ieee80211_vif pointer from the add_interface callback.
  * @success: make the channel switch successful or not