wifi: rtl8xxxu: enable channel switch support

The CSA countdown in the beacon frames, which are sent out by firmware,
needs to get updated by the driver. To achieve this, convert
update_beacon_work to delayed_work and schedule it with the beacon
interval in case CSA is active and the countdown is not complete.

Signed-off-by: Martin Kaistra <martin.kaistra@linutronix.de>
Reviewed-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://msgid.link/20240111163628.320697-3-martin.kaistra@linutronix.de

2 files changed, 16 insertions, 5 deletions

diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu.h b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu.h
index 803c76b3209c..03307da67c2c 100644
--- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu.h
+++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu.h
@@ -1900,7 +1900,7 @@ struct rtl8xxxu_priv {
 	struct delayed_work ra_watchdog;
 	struct work_struct c2hcmd_work;
 	struct sk_buff_head c2hcmd_queue;
-	struct work_struct update_beacon_work;
+	struct delayed_work update_beacon_work;
 	struct rtl8xxxu_btcoex bt_coex;
 	struct rtl8xxxu_ra_report ra_report;
 	struct rtl8xxxu_cfo_tracking cfo_tracking;
diff --git a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
index 757ebd46452e..521faa48803c 100644
--- a/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
+++ b/drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c
@@ -4605,7 +4605,7 @@ static int rtl8xxxu_set_tim(struct ieee80211_hw *hw, struct ieee80211_sta *sta,
 {
 	struct rtl8xxxu_priv *priv = hw->priv;
 
-	schedule_work(&priv->update_beacon_work);
+	schedule_delayed_work(&priv->update_beacon_work, 0);
 
 	return 0;
 }
@@ -5107,7 +5107,7 @@ rtl8xxxu_bss_info_changed(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 	}
 
 	if (changed & BSS_CHANGED_BEACON)
-		schedule_work(&priv->update_beacon_work);
+		schedule_delayed_work(&priv->update_beacon_work, 0);
 
 error:
 	return;
@@ -5726,7 +5726,7 @@ static void rtl8xxxu_send_beacon_frame(struct ieee80211_hw *hw,
 static void rtl8xxxu_update_beacon_work_callback(struct work_struct *work)
 {
 	struct rtl8xxxu_priv *priv =
-		container_of(work, struct rtl8xxxu_priv, update_beacon_work);
+		container_of(work, struct rtl8xxxu_priv, update_beacon_work.work);
 	struct ieee80211_hw *hw = priv->hw;
 	struct ieee80211_vif *vif = priv->vifs[0];
 
@@ -5735,6 +5735,14 @@ static void rtl8xxxu_update_beacon_work_callback(struct work_struct *work)
 		return;
 	}
 
+	if (vif->bss_conf.csa_active) {
+		if (ieee80211_beacon_cntdwn_is_complete(vif)) {
+			ieee80211_csa_finish(vif);
+			return;
+		}
+		schedule_delayed_work(&priv->update_beacon_work,
+				      msecs_to_jiffies(vif->bss_conf.beacon_int));
+	}
 	rtl8xxxu_send_beacon_frame(hw, vif);
 }
 
@@ -7482,6 +7490,7 @@ static void rtl8xxxu_stop(struct ieee80211_hw *hw)
 
 	cancel_work_sync(&priv->c2hcmd_work);
 	cancel_delayed_work_sync(&priv->ra_watchdog);
+	cancel_delayed_work_sync(&priv->update_beacon_work);
 
 	rtl8xxxu_free_rx_resources(priv);
 	rtl8xxxu_free_tx_resources(priv);
@@ -7764,7 +7773,7 @@ static int rtl8xxxu_probe(struct usb_interface *interface,
 	spin_lock_init(&priv->rx_urb_lock);
 	INIT_WORK(&priv->rx_urb_wq, rtl8xxxu_rx_urb_work);
 	INIT_DELAYED_WORK(&priv->ra_watchdog, rtl8xxxu_watchdog_callback);
-	INIT_WORK(&priv->update_beacon_work, rtl8xxxu_update_beacon_work_callback);
+	INIT_DELAYED_WORK(&priv->update_beacon_work, rtl8xxxu_update_beacon_work_callback);
 	skb_queue_head_init(&priv->c2hcmd_queue);
 
 	usb_set_intfdata(interface, hw);
@@ -7825,6 +7834,8 @@ static int rtl8xxxu_probe(struct usb_interface *interface,
 		hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP);
 	hw->queues = 4;
 
+	hw->wiphy->flags |= WIPHY_FLAG_HAS_CHANNEL_SWITCH;
+
 	if (priv->fops->supports_concurrent) {
 		hw->wiphy->iface_combinations = rtl8xxxu_combinations;
 		hw->wiphy->n_iface_combinations = ARRAY_SIZE(rtl8xxxu_combinations);