mac80211: clean up beacon interval settings

We currently have two beacon interval configuration knobs:
hw.conf.beacon_int and vif.bss_info.beacon_int. This is
rather confusing, even though the former is used when we
beacon ourselves and the latter when we are associated to
an AP.

This just deprecates the hw.conf.beacon_int setting in favour
of always using vif.bss_info.beacon_int. Since it touches all
the beaconing IBSS code anyway, we can also add support for
the cfg80211 IBSS beacon interval configuration easily.

NOTE: The hw.conf.beacon_int setting is retained for now due
      to drivers still using it -- I couldn't untangle all
      drivers, some are updated in this patch.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/ath/ar9170/mac.c

@@ -316,17 +316,17 @@ int ar9170_set_beacon_timers(struct ar9170 *ar)
 	u32 v = 0;
 	u32 pretbtt = 0;
 
-	v |= ar->hw->conf.beacon_int;
-
 	if (ar->vif) {
+		v |= ar->vif->bss_conf.beacon_int;
+
 		switch (ar->vif->type) {
 		case NL80211_IFTYPE_MESH_POINT:
 		case NL80211_IFTYPE_ADHOC:
 			v |= BIT(25);
 			break;
 		case NL80211_IFTYPE_AP:
 			v |= BIT(24);
-			pretbtt = (ar->hw->conf.beacon_int - 6) << 16;
+			pretbtt = (ar->vif->bss_conf.beacon_int - 6) << 16;
 			break;
 		default:
 			break;

drivers/net/wireless/ath/ar9170/main.c

@@ -1337,7 +1337,7 @@ static int ar9170_op_config(struct ieee80211_hw *hw, u32 changed)
 			goto out;
 	}
 
-	if (changed & IEEE80211_CONF_CHANGE_BEACON_INTERVAL) {
+	if (changed & BSS_CHANGED_BEACON_INT) {
 		err = ar9170_set_beacon_timers(ar);
 		if (err)
 			goto out;
@@ -1499,6 +1499,9 @@ static void ar9170_op_bss_info_changed(struct ieee80211_hw *hw,
 #endif /* CONFIG_AR9170_LEDS */
 	}
 
+	if (changed & BSS_CHANGED_BEACON_INT)
+		err = ar9170_set_beacon_timers(ar);
+
 	if (changed & BSS_CHANGED_HT) {
 		/* TODO */
 		err = 0;

drivers/net/wireless/ath/ath5k/base.c

@@ -2756,7 +2756,6 @@ ath5k_config(struct ieee80211_hw *hw, u32 changed)
 
 	mutex_lock(&sc->lock);
 
-	sc->bintval = conf->beacon_int;
 	sc->power_level = conf->power_level;
 
 	ret = ath5k_chan_set(sc, conf->channel);
@@ -3083,6 +3082,10 @@ static void ath5k_bss_info_changed(struct ieee80211_hw *hw,
 				    u32 changes)
 {
 	struct ath5k_softc *sc = hw->priv;
+
+	if (changes & BSS_CHANGED_BEACON_INT)
+		sc->bintval = bss_conf->beacon_int;
+
 	if (changes & BSS_CHANGED_ASSOC) {
 		mutex_lock(&sc->lock);
 		sc->assoc = bss_conf->assoc;

drivers/net/wireless/ath/ath9k/ath9k.h

@@ -590,6 +590,8 @@ struct ath_softc {
 	int led_on_cnt;
 	int led_off_cnt;
 
+	int beacon_interval;
+
 	struct ath_rfkill rf_kill;
 	struct ath_ani ani;
 	struct ath9k_node_stats nodestats;

drivers/net/wireless/ath/ath9k/beacon.c

@@ -320,8 +320,7 @@ int ath_beacon_alloc(struct ath_wiphy *aphy, struct ieee80211_vif *vif)
 		u64 tsfadjust;
 		int intval;
 
-		intval = sc->hw->conf.beacon_int ?
-			sc->hw->conf.beacon_int : ATH_DEFAULT_BINTVAL;
+		intval = sc->beacon_interval ? : ATH_DEFAULT_BINTVAL;
 
 		/*
 		 * Calculate the TSF offset for this beacon slot, i.e., the
@@ -431,8 +430,7 @@ void ath_beacon_tasklet(unsigned long data)
 	 * on the tsf to safeguard against missing an swba.
 	 */
 
-	intval = sc->hw->conf.beacon_int ?
-		sc->hw->conf.beacon_int : ATH_DEFAULT_BINTVAL;
+	intval = sc->beacon_interval ? : ATH_DEFAULT_BINTVAL;
 
 	tsf = ath9k_hw_gettsf64(ah);
 	tsftu = TSF_TO_TU(tsf>>32, tsf);
@@ -711,8 +709,7 @@ void ath_beacon_config(struct ath_softc *sc, struct ieee80211_vif *vif)
 	/* Setup the beacon configuration parameters */
 
 	memset(&conf, 0, sizeof(struct ath_beacon_config));
-	conf.beacon_interval = sc->hw->conf.beacon_int ?
-		sc->hw->conf.beacon_int : ATH_DEFAULT_BINTVAL;
+	conf.beacon_interval = sc->beacon_interval ? : ATH_DEFAULT_BINTVAL;
 	conf.listen_interval = 1;
 	conf.dtim_period = conf.beacon_interval;
 	conf.dtim_count = 1;

drivers/net/wireless/ath/ath9k/main.c

@@ -2358,16 +2358,6 @@ static int ath9k_config(struct ieee80211_hw *hw, u32 changed)
 	if (changed & IEEE80211_CONF_CHANGE_POWER)
 		sc->config.txpowlimit = 2 * conf->power_level;
 
-	/*
-	 * The HW TSF has to be reset when the beacon interval changes.
-	 * We set the flag here, and ath_beacon_config_ap() would take this
-	 * into account when it gets called through the subsequent
-	 * config_interface() call - with IFCC_BEACON in the changed field.
-	 */
-
-	if (changed & IEEE80211_CONF_CHANGE_BEACON_INTERVAL)
-		sc->sc_flags |= SC_OP_TSF_RESET;
-
 	mutex_unlock(&sc->mutex);
 
 	return 0;
@@ -2635,6 +2625,18 @@ static void ath9k_bss_info_changed(struct ieee80211_hw *hw,
 		ath9k_bss_assoc_info(sc, vif, bss_conf);
 	}
 
+	/*
+	 * The HW TSF has to be reset when the beacon interval changes.
+	 * We set the flag here, and ath_beacon_config_ap() would take this
+	 * into account when it gets called through the subsequent
+	 * config_interface() call - with IFCC_BEACON in the changed field.
+	 */
+
+	if (changed & BSS_CHANGED_BEACON_INT) {
+		sc->sc_flags |= SC_OP_TSF_RESET;
+		sc->beacon_interval = bss_conf->beacon_int;
+	}
+
 	mutex_unlock(&sc->mutex);
 }
 

drivers/net/wireless/ath/ath9k/xmit.c

@@ -971,7 +971,7 @@ int ath_cabq_update(struct ath_softc *sc)
 	else if (sc->config.cabqReadytime > ATH9K_READY_TIME_HI_BOUND)
 		sc->config.cabqReadytime = ATH9K_READY_TIME_HI_BOUND;
 
-	qi.tqi_readyTime = (sc->hw->conf.beacon_int *
+	qi.tqi_readyTime = (sc->beacon_interval *
 			    sc->config.cabqReadytime) / 100;
 	ath_txq_update(sc, qnum, &qi);
 

drivers/net/wireless/b43/main.c

@@ -3468,11 +3468,6 @@ static int b43_op_config(struct ieee80211_hw *hw, u32 changed)
 	if (phy->ops->set_rx_antenna)
 		phy->ops->set_rx_antenna(dev, antenna);
 
-	/* Update templates for AP/mesh mode. */
-	if (b43_is_mode(wl, NL80211_IFTYPE_AP) ||
-	    b43_is_mode(wl, NL80211_IFTYPE_MESH_POINT))
-		b43_set_beacon_int(dev, conf->beacon_int);
-
 	if (!!conf->radio_enabled != phy->radio_on) {
 		if (conf->radio_enabled) {
 			b43_software_rfkill(dev, RFKILL_STATE_UNBLOCKED);
@@ -3556,6 +3551,13 @@ static void b43_op_bss_info_changed(struct ieee80211_hw *hw,
 		goto out_unlock_mutex;
 	b43_mac_suspend(dev);
 
+	/* Update templates for AP/mesh mode. */
+	if (changed & BSS_CHANGED_BEACON_INT &&
+	    (b43_is_mode(wl, NL80211_IFTYPE_AP) ||
+	     b43_is_mode(wl, NL80211_IFTYPE_MESH_POINT) ||
+	     b43_is_mode(wl, NL80211_IFTYPE_ADHOC)))
+		b43_set_beacon_int(dev, conf->beacon_int);
+
 	if (changed & BSS_CHANGED_BASIC_RATES)
 		b43_update_basic_rates(dev, conf->basic_rates);
 

drivers/net/wireless/b43legacy/main.c

@@ -2721,11 +2721,6 @@ static int b43legacy_op_dev_config(struct ieee80211_hw *hw,
 	/* Antennas for RX and management frame TX. */
 	b43legacy_mgmtframe_txantenna(dev, antenna_tx);
 
-	/* Update templates for AP mode. */
-	if (b43legacy_is_mode(wl, NL80211_IFTYPE_AP))
-		b43legacy_set_beacon_int(dev, conf->beacon_int);
-
-
 	if (!!conf->radio_enabled != phy->radio_on) {
 		if (conf->radio_enabled) {
 			b43legacy_radio_turn_on(dev);
@@ -2827,6 +2822,11 @@ static void b43legacy_op_bss_info_changed(struct ieee80211_hw *hw,
 
 	b43legacy_mac_suspend(dev);
 
+	if (changed & BSS_CHANGED_BEACON_INT &&
+	    (b43legacy_is_mode(wl, NL80211_IFTYPE_AP) ||
+	     b43legacy_is_mode(wl, NL80211_IFTYPE_ADHOC)))
+		b43legacy_set_beacon_int(dev, conf->beacon_int);
+
 	if (changed & BSS_CHANGED_BASIC_RATES)
 		b43legacy_update_basic_rates(dev, conf->basic_rates);
 

drivers/net/wireless/iwlwifi/iwl-agn.c

@@ -567,7 +567,8 @@ static void iwl_setup_rxon_timing(struct iwl_priv *priv)
 		beacon_int = iwl_adjust_beacon_interval(priv->beacon_int);
 		priv->rxon_timing.atim_window = 0;
 	} else {
-		beacon_int = iwl_adjust_beacon_interval(conf->beacon_int);
+		beacon_int = iwl_adjust_beacon_interval(
+			priv->vif->bss_conf.beacon_int);
 
 		/* TODO: we need to get atim_window from upper stack
 		 * for now we set to 0 */

drivers/net/wireless/iwlwifi/iwl-core.c

@@ -1313,7 +1313,6 @@ int iwl_setup_mac(struct iwl_priv *priv)
 	/* Default value; 4 EDCA QOS priorities */
 	hw->queues = 4;
 
-	hw->conf.beacon_int = 100;
 	hw->max_listen_interval = IWL_CONN_MAX_LISTEN_INTERVAL;
 
 	if (priv->bands[IEEE80211_BAND_2GHZ].n_channels)
@@ -2751,7 +2750,7 @@ void iwl_mac_reset_tsf(struct ieee80211_hw *hw)
 
 	priv->ibss_beacon = NULL;
 
-	priv->beacon_int = priv->hw->conf.beacon_int;
+	priv->beacon_int = priv->vif->bss_conf.beacon_int;
 	priv->timestamp = 0;
 	if ((priv->iw_mode == NL80211_IFTYPE_STATION))
 		priv->beacon_int = 0;

drivers/net/wireless/iwlwifi/iwl3945-base.c

@@ -551,7 +551,8 @@ static void iwl3945_setup_rxon_timing(struct iwl_priv *priv)
 		priv->rxon_timing.atim_window = 0;
 	} else {
 		priv->rxon_timing.beacon_interval =
-			iwl3945_adjust_beacon_interval(conf->beacon_int);
+			iwl3945_adjust_beacon_interval(
+				priv->vif->bss_conf.beacon_int);
 		/* TODO: we need to get atim_window from upper stack
 		 * for now we set to 0 */
 		priv->rxon_timing.atim_window = 0;
@@ -4211,8 +4212,6 @@ static int iwl3945_setup_mac(struct iwl_priv *priv)
 	/* Default value; 4 EDCA QOS priorities */
 	hw->queues = 4;
 
-	hw->conf.beacon_int = 100;
-
 	if (priv->bands[IEEE80211_BAND_2GHZ].n_channels)
 		priv->hw->wiphy->bands[IEEE80211_BAND_2GHZ] =
 			&priv->bands[IEEE80211_BAND_2GHZ];

drivers/net/wireless/libertas_tf/main.c

@@ -380,7 +380,7 @@ static int lbtf_op_config_interface(struct ieee80211_hw *hw,
 		if (beacon) {
 			lbtf_beacon_set(priv, beacon);
 			kfree_skb(beacon);
-			lbtf_beacon_ctrl(priv, 1, hw->conf.beacon_int);
+			lbtf_beacon_ctrl(priv, 1, vif->bss_conf.beacon_int);
 		}
 		break;
 	default:

drivers/net/wireless/mac80211_hwsim.c

@@ -553,18 +553,13 @@ static int mac80211_hwsim_config(struct ieee80211_hw *hw, u32 changed)
 	struct mac80211_hwsim_data *data = hw->priv;
 	struct ieee80211_conf *conf = &hw->conf;
 
-	printk(KERN_DEBUG "%s:%s (freq=%d radio_enabled=%d beacon_int=%d)\n",
+	printk(KERN_DEBUG "%s:%s (freq=%d radio_enabled=%d)\n",
 	       wiphy_name(hw->wiphy), __func__,
-	       conf->channel->center_freq, conf->radio_enabled,
-	       conf->beacon_int);
+	       conf->channel->center_freq, conf->radio_enabled);
 
 	data->channel = conf->channel;
 	data->radio_enabled = conf->radio_enabled;
-	data->beacon_int = 1024 * conf->beacon_int / 1000 * HZ / 1000;
-	if (data->beacon_int < 1)
-		data->beacon_int = 1;
-
-	if (!data->started || !data->radio_enabled)
+	if (!data->started || !data->radio_enabled || !data->beacon_int)
 		del_timer(&data->beacon_timer);
 	else
 		mod_timer(&data->beacon_timer, jiffies + data->beacon_int);
@@ -615,6 +610,7 @@ static void mac80211_hwsim_bss_info_changed(struct ieee80211_hw *hw,
 					    u32 changed)
 {
 	struct hwsim_vif_priv *vp = (void *)vif->drv_priv;
+	struct mac80211_hwsim_data *data = hw->priv;
 
 	hwsim_check_magic(vif);
 
@@ -628,6 +624,14 @@ static void mac80211_hwsim_bss_info_changed(struct ieee80211_hw *hw,
 		vp->aid = info->aid;
 	}
 
+	if (changed & BSS_CHANGED_BEACON_INT) {
+		printk(KERN_DEBUG "  %s: BCNINT: %d\n",
+		       wiphy_name(hw->wiphy), info->beacon_int);
+		data->beacon_int = 1024 * info->beacon_int / 1000 * HZ / 1000;
+		if (WARN_ON(data->beacon_int))
+			data->beacon_int = 1;
+	}
+
 	if (changed & BSS_CHANGED_ERP_CTS_PROT) {
 		printk(KERN_DEBUG "  %s: ERP_CTS_PROT: %d\n",
 		       wiphy_name(hw->wiphy), info->use_cts_prot);

include/net/mac80211.h

@@ -149,6 +149,7 @@ struct ieee80211_low_level_stats {
  * @BSS_CHANGED_ERP_SLOT: slot timing changed
  * @BSS_CHANGED_HT: 802.11n parameters changed
  * @BSS_CHANGED_BASIC_RATES: Basic rateset changed
+ * @BSS_CHANGED_BEACON_INT: Beacon interval changed
  */
 enum ieee80211_bss_change {
 	BSS_CHANGED_ASSOC		= 1<<0,
@@ -157,6 +158,7 @@ enum ieee80211_bss_change {
 	BSS_CHANGED_ERP_SLOT		= 1<<3,
 	BSS_CHANGED_HT                  = 1<<4,
 	BSS_CHANGED_BASIC_RATES		= 1<<5,
+	BSS_CHANGED_BEACON_INT		= 1<<6,
 };
 
 /**
@@ -529,7 +531,7 @@ enum ieee80211_conf_flags {
  * enum ieee80211_conf_changed - denotes which configuration changed
  *
  * @IEEE80211_CONF_CHANGE_RADIO_ENABLED: the value of radio_enabled changed
- * @IEEE80211_CONF_CHANGE_BEACON_INTERVAL: the beacon interval changed
+ * @_IEEE80211_CONF_CHANGE_BEACON_INTERVAL: DEPRECATED
  * @IEEE80211_CONF_CHANGE_LISTEN_INTERVAL: the listen interval changed
  * @IEEE80211_CONF_CHANGE_RADIOTAP: the radiotap flag changed
  * @IEEE80211_CONF_CHANGE_PS: the PS flag or dynamic PS timeout changed
@@ -539,7 +541,7 @@ enum ieee80211_conf_flags {
  */
 enum ieee80211_conf_changed {
 	IEEE80211_CONF_CHANGE_RADIO_ENABLED	= BIT(0),
-	IEEE80211_CONF_CHANGE_BEACON_INTERVAL	= BIT(1),
+	_IEEE80211_CONF_CHANGE_BEACON_INTERVAL	= BIT(1),
 	IEEE80211_CONF_CHANGE_LISTEN_INTERVAL	= BIT(2),
 	IEEE80211_CONF_CHANGE_RADIOTAP		= BIT(3),
 	IEEE80211_CONF_CHANGE_PS		= BIT(4),
@@ -548,6 +550,14 @@ enum ieee80211_conf_changed {
 	IEEE80211_CONF_CHANGE_RETRY_LIMITS	= BIT(7),
 };
 
+static inline __deprecated enum ieee80211_conf_changed
+__IEEE80211_CONF_CHANGE_BEACON_INTERVAL(void)
+{
+	return _IEEE80211_CONF_CHANGE_BEACON_INTERVAL;
+}
+#define IEEE80211_CONF_CHANGE_BEACON_INTERVAL \
+	__IEEE80211_CONF_CHANGE_BEACON_INTERVAL()
+
 /**
  * struct ieee80211_conf - configuration of the device
  *

net/mac80211/cfg.c

@@ -451,18 +451,11 @@ static int ieee80211_config_beacon(struct ieee80211_sub_if_data *sdata,
 	 * This is a kludge. beacon interval should really be part
 	 * of the beacon information.
 	 */
-	if (params->interval && (sdata->local->hw.conf.beacon_int !=
-				 params->interval)) {
-		sdata->local->hw.conf.beacon_int = params->interval;
-		err = ieee80211_hw_config(sdata->local,
-					IEEE80211_CONF_CHANGE_BEACON_INTERVAL);
-		if (err < 0)
-			return err;
-		/*
-		 * We updated some parameter so if below bails out
-		 * it's not an error.
-		 */
-		err = 0;
+	if (params->interval &&
+	    (sdata->vif.bss_conf.beacon_int != params->interval)) {
+		sdata->vif.bss_conf.beacon_int = params->interval;
+		ieee80211_bss_info_change_notify(sdata,
+						 BSS_CHANGED_BEACON_INT);
 	}
 
 	/* Need to have a beacon head if we don't have one yet */