wifi: cfg80211: move DFS related members to links[] in wireless_dev

A few members related to DFS handling are currently under per wireless
device data structure. However, in order to support DFS with MLO, there is
a need to have them on a per-link manner.

Hence, as a preliminary step, move members cac_started, cac_start_time
and cac_time_ms to be on a per-link basis.

Since currently, link ID is not known at all places, use default value of
0 for now.

Signed-off-by: Aditya Kumar Singh <quic_adisi@quicinc.com>
Link: https://patch.msgid.link/20240906064426.2101315-5-quic_adisi@quicinc.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

drivers/net/wireless/marvell/mwifiex/11h.c

@@ -117,7 +117,7 @@ void mwifiex_dfs_cac_work_queue(struct work_struct *work)
 				     dfs_cac_work);
 
 	chandef = priv->dfs_chandef;
-	if (priv->wdev.cac_started) {
+	if (priv->wdev.links[0].cac_started) {
 		mwifiex_dbg(priv->adapter, MSG,
 			    "CAC timer finished; No radar detected\n");
 		cfg80211_cac_event(priv->netdev, &chandef,
@@ -174,7 +174,7 @@ int mwifiex_stop_radar_detection(struct mwifiex_private *priv,
  */
 void mwifiex_abort_cac(struct mwifiex_private *priv)
 {
-	if (priv->wdev.cac_started) {
+	if (priv->wdev.links[0].cac_started) {
 		if (mwifiex_stop_radar_detection(priv, &priv->dfs_chandef))
 			mwifiex_dbg(priv->adapter, ERROR,
 				    "failed to stop CAC in FW\n");

drivers/net/wireless/marvell/mwifiex/cfg80211.c

@@ -1906,7 +1906,7 @@ mwifiex_cfg80211_del_station(struct wiphy *wiphy, struct net_device *dev,
 	struct mwifiex_sta_node *sta_node;
 	u8 deauth_mac[ETH_ALEN];
 
-	if (!priv->bss_started && priv->wdev.cac_started) {
+	if (!priv->bss_started && priv->wdev.links[0].cac_started) {
 		mwifiex_dbg(priv->adapter, INFO, "%s: abort CAC!\n", __func__);
 		mwifiex_abort_cac(priv);
 	}
@@ -4038,7 +4038,7 @@ mwifiex_cfg80211_channel_switch(struct wiphy *wiphy, struct net_device *dev,
 		return -EBUSY;
 	}
 
-	if (priv->wdev.cac_started)
+	if (priv->wdev.links[0].cac_started)
 		return -EBUSY;
 
 	if (cfg80211_chandef_identical(&params->chandef,

drivers/net/wireless/quantenna/qtnfmac/event.c

@@ -520,21 +520,21 @@ static int qtnf_event_handle_radar(struct qtnf_vif *vif,
 		cfg80211_radar_event(wiphy, &chandef, GFP_KERNEL);
 		break;
 	case QLINK_RADAR_CAC_FINISHED:
-		if (!vif->wdev.cac_started)
+		if (!vif->wdev.links[0].cac_started)
 			break;
 
 		cfg80211_cac_event(vif->netdev, &chandef,
 				   NL80211_RADAR_CAC_FINISHED, GFP_KERNEL);
 		break;
 	case QLINK_RADAR_CAC_ABORTED:
-		if (!vif->wdev.cac_started)
+		if (!vif->wdev.links[0].cac_started)
 			break;
 
 		cfg80211_cac_event(vif->netdev, &chandef,
 				   NL80211_RADAR_CAC_ABORTED, GFP_KERNEL);
 		break;
 	case QLINK_RADAR_CAC_STARTED:
-		if (vif->wdev.cac_started)
+		if (vif->wdev.links[0].cac_started)
 			break;
 
 		if (!wiphy_ext_feature_isset(wiphy,

include/net/cfg80211.h

@@ -6194,9 +6194,6 @@ enum ieee80211_ap_reg_power {
  * @address: The address for this device, valid only if @netdev is %NULL
  * @is_running: true if this is a non-netdev device that has been started, e.g.
  *	the P2P Device.
- * @cac_started: true if DFS channel availability check has been started
- * @cac_start_time: timestamp (jiffies) when the dfs state was entered.
- * @cac_time_ms: CAC time in ms
  * @ps: powersave mode is enabled
  * @ps_timeout: dynamic powersave timeout
  * @ap_unexpected_nlportid: (private) netlink port ID of application
@@ -6220,6 +6217,11 @@ enum ieee80211_ap_reg_power {
  *	unprotected beacon report
  * @links: array of %IEEE80211_MLD_MAX_NUM_LINKS elements containing @addr
  *	@ap and @client for each link
+ * @links[].cac_started: true if DFS channel availability check has been
+ *	started
+ * @links[].cac_start_time: timestamp (jiffies) when the dfs state was
+ *	entered.
+ * @links[].cac_time_ms: CAC time in ms
  * @valid_links: bitmap describing what elements of @links are valid
  */
 struct wireless_dev {
@@ -6261,11 +6263,6 @@ struct wireless_dev {
 	u32 owner_nlportid;
 	bool nl_owner_dead;
 
-	/* FIXME: need to rework radar detection for MLO */
-	bool cac_started;
-	unsigned long cac_start_time;
-	unsigned int cac_time_ms;
-
 #ifdef CONFIG_CFG80211_WEXT
 	/* wext data */
 	struct {
@@ -6332,6 +6329,10 @@ struct wireless_dev {
 				struct cfg80211_internal_bss *current_bss;
 			} client;
 		};
+
+		bool cac_started;
+		unsigned long cac_start_time;
+		unsigned int cac_time_ms;
 	} links[IEEE80211_MLD_MAX_NUM_LINKS];
 	u16 valid_links;
 };

net/mac80211/cfg.c

@@ -1662,7 +1662,7 @@ static int ieee80211_stop_ap(struct wiphy *wiphy, struct net_device *dev,
 	ieee80211_link_info_change_notify(sdata, link,
 					  BSS_CHANGED_BEACON_ENABLED);
 
-	if (sdata->wdev.cac_started) {
+	if (sdata->wdev.links[0].cac_started) {
 		chandef = link_conf->chanreq.oper;
 		wiphy_delayed_work_cancel(wiphy, &link->dfs_cac_timer_work);
 		cfg80211_cac_event(sdata->dev, &chandef,
@@ -3501,9 +3501,9 @@ static void ieee80211_end_cac(struct wiphy *wiphy,
 		wiphy_delayed_work_cancel(wiphy,
 					  &sdata->deflink.dfs_cac_timer_work);
 
-		if (sdata->wdev.cac_started) {
+		if (sdata->wdev.links[0].cac_started) {
 			ieee80211_link_release_channel(&sdata->deflink);
-			sdata->wdev.cac_started = false;
+			sdata->wdev.links[0].cac_started = false;
 		}
 	}
 }
@@ -3958,7 +3958,7 @@ __ieee80211_channel_switch(struct wiphy *wiphy, struct net_device *dev,
 	if (!list_empty(&local->roc_list) || local->scanning)
 		return -EBUSY;
 
-	if (sdata->wdev.cac_started)
+	if (sdata->wdev.links[0].cac_started)
 		return -EBUSY;
 
 	if (WARN_ON(link_id >= IEEE80211_MLD_MAX_NUM_LINKS))

net/mac80211/iface.c

@@ -552,7 +552,7 @@ static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, bool going_do
 	wiphy_delayed_work_cancel(local->hw.wiphy,
 				  &sdata->deflink.dfs_cac_timer_work);
 
-	if (sdata->wdev.cac_started) {
+	if (sdata->wdev.links[0].cac_started) {
 		chandef = sdata->vif.bss_conf.chanreq.oper;
 		WARN_ON(local->suspended);
 		ieee80211_link_release_channel(&sdata->deflink);

net/mac80211/mlme.c

@@ -3039,7 +3039,7 @@ void ieee80211_dfs_cac_timer_work(struct wiphy *wiphy, struct wiphy_work *work)
 
 	lockdep_assert_wiphy(sdata->local->hw.wiphy);
 
-	if (sdata->wdev.cac_started) {
+	if (sdata->wdev.links[0].cac_started) {
 		ieee80211_link_release_channel(link);
 		cfg80211_cac_event(sdata->dev, &chandef,
 				   NL80211_RADAR_CAC_FINISHED,

net/mac80211/scan.c

@@ -585,7 +585,7 @@ static bool __ieee80211_can_leave_ch(struct ieee80211_sub_if_data *sdata)
 		return false;
 
 	list_for_each_entry(sdata_iter, &local->interfaces, list) {
-		if (sdata_iter->wdev.cac_started)
+		if (sdata_iter->wdev.links[0].cac_started)
 			return false;
 	}
 

net/mac80211/util.c

@@ -3478,7 +3478,7 @@ void ieee80211_dfs_cac_cancel(struct ieee80211_local *local)
 		wiphy_delayed_work_cancel(local->hw.wiphy,
 					  &sdata->deflink.dfs_cac_timer_work);
 
-		if (sdata->wdev.cac_started) {
+		if (sdata->wdev.links[0].cac_started) {
 			chandef = sdata->vif.bss_conf.chanreq.oper;
 			ieee80211_link_release_channel(&sdata->deflink);
 			cfg80211_cac_event(sdata->dev,

net/wireless/ibss.c

@@ -94,7 +94,7 @@ int __cfg80211_join_ibss(struct cfg80211_registered_device *rdev,
 
 	lockdep_assert_held(&rdev->wiphy.mtx);
 
-	if (wdev->cac_started)
+	if (wdev->links[0].cac_started)
 		return -EBUSY;
 
 	if (wdev->u.ibss.ssid_len)

net/wireless/mesh.c

@@ -127,7 +127,7 @@ int __cfg80211_join_mesh(struct cfg80211_registered_device *rdev,
 	if (!rdev->ops->join_mesh)
 		return -EOPNOTSUPP;
 
-	if (wdev->cac_started)
+	if (wdev->links[0].cac_started)
 		return -EBUSY;
 
 	if (!setup->chandef.chan) {

net/wireless/mlme.c

@@ -1123,13 +1123,14 @@ void cfg80211_cac_event(struct net_device *netdev,
 
 	trace_cfg80211_cac_event(netdev, event);
 
-	if (WARN_ON(!wdev->cac_started && event != NL80211_RADAR_CAC_STARTED))
+	if (WARN_ON(!wdev->links[0].cac_started &&
+		    event != NL80211_RADAR_CAC_STARTED))
 		return;
 
 	switch (event) {
 	case NL80211_RADAR_CAC_FINISHED:
-		timeout = wdev->cac_start_time +
+		timeout = wdev->links[0].cac_start_time +
-			  msecs_to_jiffies(wdev->cac_time_ms);
+			  msecs_to_jiffies(wdev->links[0].cac_time_ms);
 		WARN_ON(!time_after_eq(jiffies, timeout));
 		cfg80211_set_dfs_state(wiphy, chandef, NL80211_DFS_AVAILABLE);
 		memcpy(&rdev->cac_done_chandef, chandef,
@@ -1138,10 +1139,10 @@ void cfg80211_cac_event(struct net_device *netdev,
 		cfg80211_sched_dfs_chan_update(rdev);
 		fallthrough;
 	case NL80211_RADAR_CAC_ABORTED:
-		wdev->cac_started = false;
+		wdev->links[0].cac_started = false;
 		break;
 	case NL80211_RADAR_CAC_STARTED:
-		wdev->cac_started = true;
+		wdev->links[0].cac_started = true;
 		break;
 	default:
 		WARN_ON(1);

net/wireless/nl80211.c

@@ -6066,7 +6066,7 @@ static int nl80211_start_ap(struct sk_buff *skb, struct genl_info *info)
 	if (!rdev->ops->start_ap)
 		return -EOPNOTSUPP;
 
-	if (wdev->cac_started)
+	if (wdev->links[0].cac_started)
 		return -EBUSY;
 
 	if (wdev->links[link_id].ap.beacon_interval)
@@ -10121,7 +10121,7 @@ static int nl80211_start_radar_detection(struct sk_buff *skb,
 		goto unlock;
 	}
 
-	if (cfg80211_beaconing_iface_active(wdev) || wdev->cac_started) {
+	if (cfg80211_beaconing_iface_active(wdev) || wdev->links[0].cac_started) {
 		err = -EBUSY;
 		goto unlock;
 	}
@@ -10157,9 +10157,9 @@ static int nl80211_start_radar_detection(struct sk_buff *skb,
 		default:
 			break;
 		}
-		wdev->cac_started = true;
+		wdev->links[0].cac_started = true;
-		wdev->cac_start_time = jiffies;
+		wdev->links[0].cac_start_time = jiffies;
-		wdev->cac_time_ms = cac_time_ms;
+		wdev->links[0].cac_time_ms = cac_time_ms;
 	}
 unlock:
 	wiphy_unlock(wiphy);

net/wireless/reg.c

@@ -4241,7 +4241,7 @@ static void cfg80211_check_and_end_cac(struct cfg80211_registered_device *rdev)
 	list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
 		struct cfg80211_chan_def *chandef;
 
-		if (!wdev->cac_started)
+		if (!wdev->links[0].cac_started)
 			continue;
 
 		/* FIXME: radar detection is tied to link 0 for now */