add offchannel radar chain support

index e9e313aa991f..af62af6bf369 100644
@@ -4072,6 +4072,10 @@ struct mgmt_frame_regs {
  * @set_fils_aad: Set FILS AAD data to the AP driver so that the driver can use
  *	those to decrypt (Re)Association Request and encrypt (Re)Association
  *	Response frame.
+ *
+ * @set_radar_offchan: Configure dedicated chain available for radar detection
+ *	on some hw. The chain can't be used to transmits or receives frames.
+ *	The driver is supposed to implement CAC management in sw or fw.
  */
 struct cfg80211_ops {
 	int	(*suspend)(struct wiphy *wiphy, struct cfg80211_wowlan *wow);

@@ -4404,6 +4408,8 @@ struct cfg80211_ops {
 				struct cfg80211_color_change_settings *params);
 	int     (*set_fils_aad)(struct wiphy *wiphy, struct net_device *dev,
 				struct cfg80211_fils_aad *fils_aad);
+	int	(*set_radar_offchan)(struct wiphy *wiphy,
+				     struct cfg80211_chan_def *chandef);
 };
 
 /*

index 13cad5e9e6c0..faf6ede80f2b 100644
@@ -3944,6 +3944,9 @@ struct ieee80211_prep_tx_info {
  *	twt structure.
  * @twt_teardown_request: Update the hw with TWT teardown request received
  *	from the peer.
+ * @set_radar_offchan: Configure dedicated chain available for radar detection
+ *	on some hw. The chain can't be used to transmits or receives frames.
+ *	The driver is supposed to implement CAC management in sw or fw.
  */
 struct ieee80211_ops {
 	void (*tx)(struct ieee80211_hw *hw,

@@ -4272,6 +4275,8 @@ struct ieee80211_ops {
 			      struct ieee80211_twt_setup *twt);
 	void (*twt_teardown_request)(struct ieee80211_hw *hw,
 				     struct ieee80211_sta *sta, u8 flowid);
+	int (*set_radar_offchan)(struct ieee80211_hw *hw,
+				 struct cfg80211_chan_def *chandef);
 };
 
 /**

index e2b791c37591..1ab84830a38f 100644
@@ -4379,6 +4379,18 @@ ieee80211_color_change(struct wiphy *wiphy, struct net_device *dev,
 	return err;
 }
 
+static int
+ieee80211_set_radar_offchan(struct wiphy *wiphy,
+			    struct cfg80211_chan_def *chandef)
+{
+	struct ieee80211_local *local = wiphy_priv(wiphy);
+
+	if (!local->ops->set_radar_offchan)
+		return -EOPNOTSUPP;
+
+	return local->ops->set_radar_offchan(&local->hw, chandef);
+}
+
 const struct cfg80211_ops mac80211_config_ops = {
 	.add_virtual_intf = ieee80211_add_iface,
 	.del_virtual_intf = ieee80211_del_iface,

@@ -4483,4 +4495,5 @@ const struct cfg80211_ops mac80211_config_ops = {
 	.reset_tid_config = ieee80211_reset_tid_config,
 	.set_sar_specs = ieee80211_set_sar_specs,
 	.color_change = ieee80211_color_change,
+	.set_radar_offchan = ieee80211_set_radar_offchan,
 };

index cc1efec4b27b..8672b3ef99e4 100644
@@ -1395,4 +1395,21 @@ rdev_set_fils_aad(struct cfg80211_registered_device *rdev,
 	return ret;
 }
 
+static inline int
+rdev_set_radar_offchan(struct cfg80211_registered_device *rdev,
+		       struct cfg80211_chan_def *chandef)
+{
+	struct wiphy *wiphy = &rdev->wiphy;
+	int ret;
+
+	if (!rdev->ops->set_radar_offchan)
+		return -EOPNOTSUPP;
+
+	trace_rdev_set_radar_offchan(wiphy, chandef);
+	ret = rdev->ops->set_radar_offchan(wiphy, chandef);
+	trace_rdev_return_int(wiphy, ret);
+
+	return ret;
+}
+
 #endif /* __CFG80211_RDEV_OPS */

index ad6c16a06bcb..0b27eaa14a18 100644
@@ -3674,6 +3674,25 @@ TRACE_EVENT(cfg80211_bss_color_notify,
 		  __entry->color_bitmap)
 );
 
+TRACE_EVENT(rdev_set_radar_offchan,
+	TP_PROTO(struct wiphy *wiphy, struct cfg80211_chan_def *chandef),
+
+	TP_ARGS(wiphy, chandef),
+
+	TP_STRUCT__entry(
+		WIPHY_ENTRY
+		CHAN_DEF_ENTRY
+	),
+
+	TP_fast_assign(
+		WIPHY_ASSIGN;
+		CHAN_DEF_ASSIGN(chandef)
+	),
+
+	TP_printk(WIPHY_PR_FMT ", " CHAN_DEF_PR_FMT,
+		  WIPHY_PR_ARG, CHAN_DEF_PR_ARG)
+);
+
 #endif /* !__RDEV_OPS_TRACE || TRACE_HEADER_MULTI_READ */
 
 #undef TRACE_INCLUDE_PATH

index eda608b1eb09..96e622777bb2 100644
@@ -2639,6 +2639,10 @@ enum nl80211_commands {
  *	Mandatory parameter for the transmitting interface to enable MBSSID.
  *	Optional for the non-transmitting interfaces.
  *
+ * @NL80211_ATTR_RADAR_OFFCHAN: Configure dedicated chain available for radar
+ *	detection on some hw. The chain can't be used to transmits or receives
+ *	frames. The driver is supposed to implement CAC management in sw or fw.
+ *
  * @NUM_NL80211_ATTR: total number of nl80211_attrs available
  * @NL80211_ATTR_MAX: highest attribute number currently defined
  * @__NL80211_ATTR_AFTER_LAST: internal use

@@ -3145,6 +3149,8 @@ enum nl80211_attrs {
 	NL80211_ATTR_MBSSID_CONFIG,
 	NL80211_ATTR_MBSSID_ELEMS,
 
+	NL80211_ATTR_RADAR_OFFCHAN,
+
 	/* add attributes here, update the policy in nl80211.c */
 
 	__NL80211_ATTR_AFTER_LAST,

index 3f37e4d5c5d2..a296f180624e 100644
@@ -776,6 +776,7 @@ static const struct nla_policy nl80211_policy[NUM_NL80211_ATTR] = {
 	[NL80211_ATTR_MBSSID_CONFIG] =
 			NLA_POLICY_NESTED(nl80211_mbssid_config_policy),
 	[NL80211_ATTR_MBSSID_ELEMS] = { .type = NLA_NESTED },
+	[NL80211_ATTR_RADAR_OFFCHAN] = { .type = NLA_FLAG },
 };
 
 /* policy for the key attributes */

@@ -9279,10 +9280,12 @@ static int nl80211_start_radar_detection(struct sk_buff *skb,
 	if (err)
 		return err;
 
-	if (netif_carrier_ok(dev))
+	if (!nla_get_flag(info->attrs[NL80211_ATTR_RADAR_OFFCHAN]) &&
+	    netif_carrier_ok(dev))
 		return -EBUSY;
 
-	if (wdev->cac_started)
+	if (!nla_get_flag(info->attrs[NL80211_ATTR_RADAR_OFFCHAN]) &&
+	    wdev->cac_started)
 		return -EBUSY;
 
 	err = cfg80211_chandef_dfs_required(wiphy, &chandef, wdev->iftype);

@@ -9299,6 +9302,11 @@ static int nl80211_start_radar_detection(struct sk_buff *skb,
 	if (wiphy_ext_feature_isset(wiphy, NL80211_EXT_FEATURE_DFS_OFFLOAD))
 		return -EOPNOTSUPP;
 
+	if (nla_get_flag(info->attrs[NL80211_ATTR_RADAR_OFFCHAN])) {
+		/* offchannel radar detection */
+		return rdev_set_radar_offchan(rdev, &chandef);
+	}
+
 	if (!rdev->ops->start_radar_detection)
 		return -EOPNOTSUPP;
 

index af62af6bf369..2419b4e192ae 100644
@@ -7630,6 +7630,19 @@ void cfg80211_cac_event(struct net_device *netdev,
 			const struct cfg80211_chan_def *chandef,
 			enum nl80211_radar_event event, gfp_t gfp);
 
+/**
+ * cfg80211_cac_offchan_event - Channel Availability Check (CAC) offchan event
+ * @wiphy: the wiphy
+ * @chandef: chandef for the current channel
+ * @event: type of event
+ * @gfp: context flags
+ *
+ * This function is called when a Channel Availability Check (CAC) is finished
+ * or aborted by offchannel dedicated chain.
+ */
+void cfg80211_cac_offchan_event(struct wiphy *wiphy,
+				const struct cfg80211_chan_def *chandef,
+				enum nl80211_radar_event event, gfp_t gfp);
 
 /**
  * cfg80211_gtk_rekey_notify - notify userspace about driver rekeying

index 3aa69b375a10..4362f4f49bb4 100644
@@ -968,3 +968,29 @@ void cfg80211_cac_event(struct net_device *netdev,
 	nl80211_radar_notify(rdev, chandef, event, netdev, gfp);
 }
 EXPORT_SYMBOL(cfg80211_cac_event);
+
+void cfg80211_cac_offchan_event(struct wiphy *wiphy,
+				const struct cfg80211_chan_def *chandef,
+				enum nl80211_radar_event event, gfp_t gfp)
+{
+	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
+
+	switch (event) {
+	case NL80211_RADAR_CAC_FINISHED:
+		cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_AVAILABLE);
+		memcpy(&rdev->cac_done_chandef, chandef,
+		       sizeof(struct cfg80211_chan_def));
+		queue_work(cfg80211_wq, &rdev->propagate_cac_done_wk);
+		cfg80211_sched_dfs_chan_update(rdev);
+		break;
+	case NL80211_RADAR_CAC_ABORTED:
+	case NL80211_RADAR_CAC_STARTED:
+		break;
+	default:
+		WARN_ON(1);
+		return;
+	}
+
+	nl80211_radar_notify(rdev, chandef, event, NULL, gfp);
+}
+EXPORT_SYMBOL(cfg80211_cac_offchan_event);

index 96e622777bb2..d856c95ea736 100644
@@ -6055,6 +6055,9 @@ enum nl80211_feature_flags {
  *	frames. Userspace has to share FILS AAD details to the driver by using
  *	@NL80211_CMD_SET_FILS_AAD.
  *
+ * @NL80211_EXT_FEATURE_RADAR_OFFCHAN: Device supports offchannel radar/CAC
+ *	detection.
+ *
  * @NUM_NL80211_EXT_FEATURES: number of extended features.
  * @MAX_NL80211_EXT_FEATURES: highest extended feature index.
  */

@@ -6121,6 +6124,7 @@ enum nl80211_ext_feature_index {
 	NL80211_EXT_FEATURE_PROT_RANGE_NEGO_AND_MEASURE,
 	NL80211_EXT_FEATURE_BSS_COLOR,
 	NL80211_EXT_FEATURE_FILS_CRYPTO_OFFLOAD,
+	NL80211_EXT_FEATURE_RADAR_OFFCHAN,
 
 	/* add new features before the definition below */
 	NUM_NL80211_EXT_FEATURES,

index a296f180624e..9f19ff5b13c5 100644
@@ -9304,6 +9304,10 @@ static int nl80211_start_radar_detection(struct sk_buff *skb,
 
 	if (nla_get_flag(info->attrs[NL80211_ATTR_RADAR_OFFCHAN])) {
 		/* offchannel radar detection */
+		if (!wiphy_ext_feature_isset(wiphy,
+					     NL80211_EXT_FEATURE_RADAR_OFFCHAN))
+			return -EOPNOTSUPP;
+
 		return rdev_set_radar_offchan(rdev, &chandef);
 	}