wifi: mac80211: handle ieee80211_radar_detected() for MLO

Currently DFS works under assumption there could be only one channel
context in the hardware. Hence, drivers just calls the function
ieee80211_radar_detected() passing the hardware structure. However, with
MLO, this obviously will not work since number of channel contexts will be
more than one and hence drivers would need to pass the channel information
as well on which the radar is detected.

Also, when radar is detected in one of the links, other link's CAC should
not be cancelled.

Hence, in order to support DFS with MLO, do the following changes -
  * Add channel context conf pointer as an argument to the function
    ieee80211_radar_detected(). During MLO, drivers would have to pass on
    which channel context conf radar is detected. Otherwise, drivers could
    just pass NULL.
  * ieee80211_radar_detected() will iterate over all channel contexts
    present and
  	* if channel context conf is passed, only mark that as radar
  	  detected
  	* if NULL is passed, then mark all channel contexts as radar
  	  detected
  	* Then as usual, schedule the radar detected work.
  * In the worker, go over all the contexts again and for all such context
    which is marked with radar detected, cancel the ongoing CAC by calling
    ieee80211_dfs_cac_cancel() and then notify cfg80211 via
    cfg80211_radar_event().
  * To cancel the CAC, pass the channel context as well where radar is
    detected to ieee80211_dfs_cac_cancel(). This ensures that CAC is
    canceled only on the links using the provided context, leaving other
    links unaffected.

This would also help in scenarios where there is split phy 5 GHz radio,
which is capable of DFS channels in both lower and upper band. In this
case, simultaneous radars can be detected.

Signed-off-by: Aditya Kumar Singh <quic_adisi@quicinc.com>
Link: https://patch.msgid.link/20240906064426.2101315-9-quic_adisi@quicinc.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

13 files changed, 15 insertions, 15 deletions

diff --git a/drivers/net/wireless/ath/ath10k/debug.c b/drivers/net/wireless/ath/ath10k/debug.c
index b93a64bf8190..35bfe7232e95 100644
--- a/drivers/net/wireless/ath/ath10k/debug.c
+++ b/drivers/net/wireless/ath/ath10k/debug.c
@@ -3,7 +3,7 @@
  * Copyright (c) 2005-2011 Atheros Communications Inc.
  * Copyright (c) 2011-2017 Qualcomm Atheros, Inc.
  * Copyright (c) 2018, The Linux Foundation. All rights reserved.
- * Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved.
+ * Copyright (c) 2022, 2024 Qualcomm Innovation Center, Inc. All rights reserved.
  */
 
 #include <linux/module.h>
@@ -1774,7 +1774,7 @@ static ssize_t ath10k_write_simulate_radar(struct file *file,
 	if (!arvif->is_started)
 		return -EINVAL;
 
-	ieee80211_radar_detected(ar->hw);
+	ieee80211_radar_detected(ar->hw, NULL);
 
 	return count;
 }
diff --git a/drivers/net/wireless/ath/ath10k/mac.c b/drivers/net/wireless/ath/ath10k/mac.c
index a5da32e87106..646e1737d4c4 100644
--- a/drivers/net/wireless/ath/ath10k/mac.c
+++ b/drivers/net/wireless/ath/ath10k/mac.c
@@ -1437,7 +1437,7 @@ static void ath10k_recalc_radar_detection(struct ath10k *ar)
 		 * by indicating that radar was detected.
 		 */
 		ath10k_warn(ar, "failed to start CAC: %d\n", ret);
-		ieee80211_radar_detected(ar->hw);
+		ieee80211_radar_detected(ar->hw, NULL);
 	}
 }
 
diff --git a/drivers/net/wireless/ath/ath10k/wmi.c b/drivers/net/wireless/ath/ath10k/wmi.c
index fe2344598364..4861179b2217 100644
--- a/drivers/net/wireless/ath/ath10k/wmi.c
+++ b/drivers/net/wireless/ath/ath10k/wmi.c
@@ -3990,7 +3990,7 @@ static void ath10k_radar_detected(struct ath10k *ar)
 	if (ar->dfs_block_radar_events)
 		ath10k_info(ar, "DFS Radar detected, but ignored as requested\n");
 	else
-		ieee80211_radar_detected(ar->hw);
+		ieee80211_radar_detected(ar->hw, NULL);
 }
 
 static void ath10k_radar_confirmation_work(struct work_struct *work)
diff --git a/drivers/net/wireless/ath/ath11k/wmi.c b/drivers/net/wireless/ath/ath11k/wmi.c
index 2662092ee00a..87abfa547529 100644
--- a/drivers/net/wireless/ath/ath11k/wmi.c
+++ b/drivers/net/wireless/ath/ath11k/wmi.c
@@ -8358,7 +8358,7 @@ ath11k_wmi_pdev_dfs_radar_detected_event(struct ath11k_base *ab, struct sk_buff
 	if (ar->dfs_block_radar_events)
 		ath11k_info(ab, "DFS Radar detected, but ignored as requested\n");
 	else
-		ieee80211_radar_detected(ar->hw);
+		ieee80211_radar_detected(ar->hw, NULL);
 
 exit:
 	rcu_read_unlock();
diff --git a/drivers/net/wireless/ath/ath12k/wmi.c b/drivers/net/wireless/ath/ath12k/wmi.c
index a76413320dbf..2cd3ff9b0164 100644
--- a/drivers/net/wireless/ath/ath12k/wmi.c
+++ b/drivers/net/wireless/ath/ath12k/wmi.c
@@ -6789,7 +6789,7 @@ ath12k_wmi_pdev_dfs_radar_detected_event(struct ath12k_base *ab, struct sk_buff
 	if (ar->dfs_block_radar_events)
 		ath12k_info(ab, "DFS Radar detected, but ignored as requested\n");
 	else
-		ieee80211_radar_detected(ath12k_ar_to_hw(ar));
+		ieee80211_radar_detected(ath12k_ar_to_hw(ar), NULL);
 
 exit:
 	rcu_read_unlock();
diff --git a/drivers/net/wireless/ath/ath9k/dfs.c b/drivers/net/wireless/ath/ath9k/dfs.c
index 11349218bc21..3689e12db9f7 100644
--- a/drivers/net/wireless/ath/ath9k/dfs.c
+++ b/drivers/net/wireless/ath/ath9k/dfs.c
@@ -280,7 +280,7 @@ ath9k_dfs_process_radar_pulse(struct ath_softc *sc, struct pulse_event *pe)
 	if (!pd->add_pulse(pd, pe, NULL))
 		return;
 	DFS_STAT_INC(sc, radar_detected);
-	ieee80211_radar_detected(sc->hw);
+	ieee80211_radar_detected(sc->hw, NULL);
 }
 
 /*
diff --git a/drivers/net/wireless/ath/ath9k/dfs_debug.c b/drivers/net/wireless/ath/ath9k/dfs_debug.c
index 8e18e9b4ef48..426caa057396 100644
--- a/drivers/net/wireless/ath/ath9k/dfs_debug.c
+++ b/drivers/net/wireless/ath/ath9k/dfs_debug.c
@@ -116,7 +116,7 @@ static ssize_t write_file_simulate_radar(struct file *file,
 {
 	struct ath_softc *sc = file->private_data;
 
-	ieee80211_radar_detected(sc->hw);
+	ieee80211_radar_detected(sc->hw, NULL);
 
 	return count;
 }
diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7615/mcu.c
index d50d967828be..53c8ebe179dd 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7615/mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7615/mcu.c
@@ -394,7 +394,7 @@ mt7615_mcu_rx_radar_detected(struct mt7615_dev *dev, struct sk_buff *skb)
 	if (mt76_phy_dfs_state(mphy) < MT_DFS_STATE_CAC)
 		return;
 
-	ieee80211_radar_detected(mphy->hw);
+	ieee80211_radar_detected(mphy->hw, NULL);
 	dev->hw_pattern++;
 }
 
diff --git a/drivers/net/wireless/mediatek/mt76/mt76x02_dfs.c b/drivers/net/wireless/mediatek/mt76/mt76x02_dfs.c
index 024a5c0a5a57..7a07636d09c6 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76x02_dfs.c
+++ b/drivers/net/wireless/mediatek/mt76/mt76x02_dfs.c
@@ -630,7 +630,7 @@ static void mt76x02_dfs_tasklet(struct tasklet_struct *t)
 		radar_detected = mt76x02_dfs_check_detection(dev);
 		if (radar_detected) {
 			/* sw detector rx radar pattern */
-			ieee80211_radar_detected(dev->mt76.hw);
+			ieee80211_radar_detected(dev->mt76.hw, NULL);
 			mt76x02_dfs_detector_reset(dev);
 
 			return;
@@ -658,7 +658,7 @@ static void mt76x02_dfs_tasklet(struct tasklet_struct *t)
 
 		/* hw detector rx radar pattern */
 		dfs_pd->stats[i].hw_pattern++;
-		ieee80211_radar_detected(dev->mt76.hw);
+		ieee80211_radar_detected(dev->mt76.hw, NULL);
 		mt76x02_dfs_detector_reset(dev);
 
 		return;
diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
index 2185cd24e2e1..5f180851060d 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
@@ -293,7 +293,7 @@ mt7915_mcu_rx_radar_detected(struct mt7915_dev *dev, struct sk_buff *skb)
 						&dev->rdd2_chandef,
 						GFP_ATOMIC);
 	else
-		ieee80211_radar_detected(mphy->hw);
+		ieee80211_radar_detected(mphy->hw, NULL);
 	dev->hw_pattern++;
 }
 
diff --git a/drivers/net/wireless/mediatek/mt76/mt7996/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7996/mcu.c
index 2e4fa9f48dfb..f8921546a5e6 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7996/mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7996/mcu.c
@@ -371,7 +371,7 @@ mt7996_mcu_rx_radar_detected(struct mt7996_dev *dev, struct sk_buff *skb)
 						&dev->rdd2_chandef,
 						GFP_ATOMIC);
 	else
-		ieee80211_radar_detected(mphy->hw);
+		ieee80211_radar_detected(mphy->hw, NULL);
 	dev->hw_pattern++;
 }
 
diff --git a/drivers/net/wireless/ti/wl18xx/event.c b/drivers/net/wireless/ti/wl18xx/event.c
index 34d95f458e1a..a9f090e15cbb 100644
--- a/drivers/net/wireless/ti/wl18xx/event.c
+++ b/drivers/net/wireless/ti/wl18xx/event.c
@@ -142,7 +142,7 @@ int wl18xx_process_mailbox_events(struct wl1271 *wl)
 			    wl18xx_radar_type_decode(mbox->radar_type));
 
 		if (!wl->radar_debug_mode)
-			ieee80211_radar_detected(wl->hw);
+			ieee80211_radar_detected(wl->hw, NULL);
 	}
 
 	if (vector & PERIODIC_SCAN_REPORT_EVENT_ID) {
diff --git a/drivers/net/wireless/virtual/mac80211_hwsim.c b/drivers/net/wireless/virtual/mac80211_hwsim.c
index 5fe9e4e26142..f0e528abb1b4 100644
--- a/drivers/net/wireless/virtual/mac80211_hwsim.c
+++ b/drivers/net/wireless/virtual/mac80211_hwsim.c
@@ -1146,7 +1146,7 @@ static int hwsim_write_simulate_radar(void *dat, u64 val)
 {
 	struct mac80211_hwsim_data *data = dat;
 
-	ieee80211_radar_detected(data->hw);
+	ieee80211_radar_detected(data->hw, NULL);
 
 	return 0;
 }