From 96d0335462d6762924800c7d90e378eebe590385 Mon Sep 17 00:00:00 2001
From: Yi-Chia Hsieh <yi-chia.hsieh@mediatek.com>
Date: Mon, 13 Mar 2023 05:36:59 +0800
Subject: [PATCH 2/2] mac80211: mtk: ageout color bitmap

Adding a periodic work which runs once per second to check BSS color.
OBSS BSS Color will be ageout if not seen for 10 seconds.
---
 include/net/mac80211.h     |  1 +
 net/mac80211/cfg.c         | 26 ++++++++++++++++++++++++++
 net/mac80211/ieee80211_i.h |  6 ++++++
 net/mac80211/iface.c       |  5 +++++
 net/mac80211/rx.c          |  1 +
 5 files changed, 39 insertions(+)

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 3cf1745..d044be5 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -730,6 +730,7 @@ struct ieee80211_bss_conf {
 	struct ieee80211_he_obss_pd he_obss_pd;
 	struct cfg80211_he_bss_color he_bss_color;
 	u64 used_color_bitmap;
+	u64 color_last_seen[64];
 	struct ieee80211_fils_discovery fils_discovery;
 	u32 unsol_bcast_probe_resp_interval;
 	struct cfg80211_bitrate_mask beacon_tx_rate;
diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 5c9dda1..4bcb1d4 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -4755,6 +4755,32 @@ out:
 	return err;
 }
 
+void
+ieee80211_color_aging_work(struct work_struct *work)
+{
+	struct ieee80211_sub_if_data *sdata =
+		container_of(work, struct ieee80211_sub_if_data,
+				color_aging_work.work);
+	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
+	int i = 0;
+
+	sdata_lock(sdata);
+
+	for (i = 0; i < IEEE80211_BSS_COLOR_MAX; i++) {
+		/* ageout if not seen for a period */
+		if ((bss_conf->used_color_bitmap & BIT_ULL(i)) &&
+		     time_before(bss_conf->color_last_seen[i],
+				 jiffies - IEEE80211_BSS_COLOR_AGEOUT_TIME * HZ)) {
+			bss_conf->used_color_bitmap &= ~BIT_ULL(i);
+		}
+	}
+
+	ieee80211_queue_delayed_work(&sdata->local->hw,
+			&sdata->color_aging_work, HZ);
+
+	sdata_unlock(sdata);
+}
+
 static int
 ieee80211_set_radar_background(struct wiphy *wiphy,
 			       struct cfg80211_chan_def *chandef)
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index a10ef29..295f45b 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -1111,6 +1111,8 @@ struct ieee80211_sub_if_data {
 	} debugfs;
 #endif
 
+	struct delayed_work color_aging_work;
+
 	/* must be last, dynamically sized area in this! */
 	struct ieee80211_vif vif;
 };
@@ -1930,8 +1932,12 @@ void ieee80211_csa_finalize_work(struct work_struct *work);
 int ieee80211_channel_switch(struct wiphy *wiphy, struct net_device *dev,
 			     struct cfg80211_csa_settings *params);
 
+#define IEEE80211_BSS_COLOR_AGEOUT_TIME        10
+#define IEEE80211_BSS_COLOR_MAX                64
+
 /* color change handling */
 void ieee80211_color_change_finalize_work(struct work_struct *work);
+void ieee80211_color_aging_work(struct work_struct *work);
 
 /* interface handling */
 #define MAC80211_SUPPORTED_FEATURES_TX	(NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM | \
diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c
index b80fb66..6d37adb 100644
--- a/net/mac80211/iface.c
+++ b/net/mac80211/iface.c
@@ -541,6 +541,8 @@ static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, bool going_do
 	cancel_work_sync(&sdata->deflink.color_change_finalize_work);
 
 	cancel_delayed_work_sync(&sdata->deflink.dfs_cac_timer_work);
+	if (sdata->vif.type == NL80211_IFTYPE_AP)
+		cancel_delayed_work_sync(&sdata->color_aging_work);
 
 	if (sdata->wdev.cac_started) {
 		chandef = sdata->vif.bss_conf.chandef;
@@ -1787,6 +1789,9 @@ static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
 		skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
 		INIT_LIST_HEAD(&sdata->u.ap.vlans);
 		sdata->vif.bss_conf.bssid = sdata->vif.addr;
+		INIT_DELAYED_WORK(&sdata->color_aging_work, ieee80211_color_aging_work);
+		ieee80211_queue_delayed_work(&sdata->local->hw,
+					     &sdata->color_aging_work, 0);
 		break;
 	case NL80211_IFTYPE_P2P_CLIENT:
 		type = NL80211_IFTYPE_STATION;
diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index fd2f650..67c768c 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -3340,6 +3340,7 @@ ieee80211_rx_check_bss_color_collision(struct ieee80211_rx_data *rx)
 				      IEEE80211_HE_OPERATION_BSS_COLOR_MASK);
 
 		bss_conf->used_color_bitmap |= BIT_ULL(color);
+		bss_conf->color_last_seen[color] = jiffies;
 
 		trace_bss_color_bitmap(color, bss_conf->used_color_bitmap);
 
-- 
2.39.0