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Commit 164eb02d authored by Simon Wunderlich's avatar Simon Wunderlich Committed by Johannes Berg
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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: default avatarSimon Wunderlich <siwu@hrz.tu-chemnitz.de>
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent 04f39047

include/net/mac80211.h

+14 −0
Original line number Diff line number Diff line
@@ -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;

};
@@ -3944,6 +3951,13 @@ void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif, 
			       enum nl80211_cqm_rssi_threshold_event rssi_event,

			       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.

net/mac80211/cfg.c

+35 −1
Original line number Diff line number Diff line
@@ -928,6 +928,7 @@ static int ieee80211_start_ap(struct wiphy *wiphy, struct net_device *dev, 
	/* TODO: make hostapd tell us what it wants */

	sdata->smps_mode = IEEE80211_SMPS_OFF;

	sdata->needed_rx_chains = sdata->local->rx_chains;

	sdata->radar_required = params->radar_required;



	err = ieee80211_vif_use_channel(sdata, &params->chandef,

					IEEE80211_CHANCTX_SHARED);
@@ -2395,7 +2396,8 @@ static int ieee80211_start_roc_work(struct ieee80211_local *local, 
	INIT_LIST_HEAD(&roc->dependents);



	/* if there's one pending or we're scanning, queue this one */

	if (!list_empty(&local->roc_list) || local->scanning)

	if (!list_empty(&local->roc_list) ||

	    local->scanning || local->radar_detect_enabled)

		goto out_check_combine;



	/* if not HW assist, just queue & schedule work */
@@ -2645,6 +2647,37 @@ static int ieee80211_cancel_remain_on_channel(struct wiphy *wiphy, 
	return ieee80211_cancel_roc(local, cookie, false);

}



static int ieee80211_start_radar_detection(struct wiphy *wiphy,

					   struct net_device *dev,

					   struct cfg80211_chan_def *chandef)

{

	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);

	struct ieee80211_local *local = sdata->local;

	unsigned long timeout;

	int err;



	if (!list_empty(&local->roc_list) || local->scanning)

		return -EBUSY;



	/* whatever, but channel contexts should not complain about that one */

	sdata->smps_mode = IEEE80211_SMPS_OFF;

	sdata->needed_rx_chains = local->rx_chains;

	sdata->radar_required = true;



	mutex_lock(&local->iflist_mtx);

	err = ieee80211_vif_use_channel(sdata, chandef,

					IEEE80211_CHANCTX_SHARED);

	mutex_unlock(&local->iflist_mtx);

	if (err)

		return err;



	timeout = msecs_to_jiffies(IEEE80211_DFS_MIN_CAC_TIME_MS);

	ieee80211_queue_delayed_work(&sdata->local->hw,

				     &sdata->dfs_cac_timer_work, timeout);



	return 0;

}



static int ieee80211_mgmt_tx(struct wiphy *wiphy, struct wireless_dev *wdev,

			     struct ieee80211_channel *chan, bool offchan,

			     unsigned int wait, const u8 *buf, size_t len,
@@ -3350,4 +3383,5 @@ struct cfg80211_ops mac80211_config_ops = { 
	.get_et_stats = ieee80211_get_et_stats,

	.get_et_strings = ieee80211_get_et_strings,

	.get_channel = ieee80211_cfg_get_channel,

	.start_radar_detection = ieee80211_start_radar_detection,

};

net/mac80211/chan.c

+33 −0
Original line number Diff line number Diff line
@@ -193,6 +193,7 @@ static void ieee80211_unassign_vif_chanctx(struct ieee80211_sub_if_data *sdata, 
	if (ctx->refcount > 0) {

		ieee80211_recalc_chanctx_chantype(sdata->local, ctx);

		ieee80211_recalc_smps_chanctx(local, ctx);

		ieee80211_recalc_radar_chanctx(local, ctx);

	}

}
@@ -216,6 +217,37 @@ static void __ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata) 
		ieee80211_free_chanctx(local, ctx);

}



void ieee80211_recalc_radar_chanctx(struct ieee80211_local *local,

				    struct ieee80211_chanctx *chanctx)

{

	struct ieee80211_sub_if_data *sdata;

	bool radar_enabled = false;



	lockdep_assert_held(&local->chanctx_mtx);



	rcu_read_lock();

	list_for_each_entry_rcu(sdata, &local->interfaces, list) {

		if (sdata->radar_required) {

			radar_enabled = true;

			break;

		}

	}

	rcu_read_unlock();



	if (radar_enabled == chanctx->conf.radar_enabled)

		return;



	chanctx->conf.radar_enabled = radar_enabled;

	local->radar_detect_enabled = chanctx->conf.radar_enabled;



	if (!local->use_chanctx) {

		local->hw.conf.radar_enabled = chanctx->conf.radar_enabled;

		ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);

	}



	drv_change_chanctx(local, chanctx, IEEE80211_CHANCTX_CHANGE_RADAR);

}



void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local,

				   struct ieee80211_chanctx *chanctx)

{
@@ -331,6 +363,7 @@ int ieee80211_vif_use_channel(struct ieee80211_sub_if_data *sdata, 
	}



	ieee80211_recalc_smps_chanctx(local, ctx);

	ieee80211_recalc_radar_chanctx(local, ctx);

 out:

	mutex_unlock(&local->chanctx_mtx);

	return ret;

net/mac80211/ieee80211_i.h

+14 −0
Original line number Diff line number Diff line
@@ -722,6 +722,9 @@ struct ieee80211_sub_if_data { 
	int user_power_level; /* in dBm */

	int ap_power_level; /* in dBm */



	bool radar_required;

	struct delayed_work dfs_cac_timer_work;



	/*

	 * AP this belongs to: self in AP mode and

	 * corresponding AP in VLAN mode, NULL for
@@ -942,6 +945,10 @@ struct ieee80211_local { 
	/* wowlan is enabled -- don't reconfig on resume */

	bool wowlan;



	/* DFS/radar detection is enabled */

	bool radar_detect_enabled;

	struct work_struct radar_detected_work;



	/* number of RX chains the hardware has */

	u8 rx_chains;
@@ -1606,6 +1613,13 @@ void ieee80211_vif_copy_chanctx_to_vlans(struct ieee80211_sub_if_data *sdata, 


void ieee80211_recalc_smps_chanctx(struct ieee80211_local *local,

				   struct ieee80211_chanctx *chanctx);

void ieee80211_recalc_radar_chanctx(struct ieee80211_local *local,

				    struct ieee80211_chanctx *chanctx);



void ieee80211_dfs_cac_timer(unsigned long data);

void ieee80211_dfs_cac_timer_work(struct work_struct *work);

void ieee80211_dfs_cac_cancel(struct ieee80211_local *local);

void ieee80211_dfs_radar_detected_work(struct work_struct *work);



#ifdef CONFIG_MAC80211_NOINLINE

#define debug_noinline noinline

net/mac80211/iface.c

+12 −0
Original line number Diff line number Diff line
@@ -749,6 +749,16 @@ static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, 


	cancel_work_sync(&sdata->recalc_smps);



	cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);



	if (sdata->wdev.cac_started) {

		mutex_lock(&local->iflist_mtx);

		ieee80211_vif_release_channel(sdata);

		mutex_unlock(&local->iflist_mtx);

		cfg80211_cac_event(sdata->dev, NL80211_RADAR_CAC_ABORTED,

				   GFP_KERNEL);

	}



	/* APs need special treatment */

	if (sdata->vif.type == NL80211_IFTYPE_AP) {

		struct ieee80211_sub_if_data *vlan, *tmpsdata;
@@ -1513,6 +1523,8 @@ int ieee80211_if_add(struct ieee80211_local *local, const char *name, 
	spin_lock_init(&sdata->cleanup_stations_lock);

	INIT_LIST_HEAD(&sdata->cleanup_stations);

	INIT_WORK(&sdata->cleanup_stations_wk, ieee80211_cleanup_sdata_stas_wk);

	INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,

			  ieee80211_dfs_cac_timer_work);



	for (i = 0; i < IEEE80211_NUM_BANDS; i++) {

		struct ieee80211_supported_band *sband;