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>

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 */

net/mac80211/ibss.c

@@ -73,6 +73,7 @@ static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 	struct ieee80211_mgmt *mgmt;
 	u8 *pos;
 	struct ieee80211_supported_band *sband;
+	u32 bss_change;
 
 	if (local->ops->reset_tsf) {
 		/* Reset own TSF to allow time synchronization work. */
@@ -92,8 +93,6 @@ static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 
 	memcpy(ifibss->bssid, bssid, ETH_ALEN);
 
-	local->hw.conf.beacon_int = beacon_int >= 10 ? beacon_int : 10;
-
 	sdata->drop_unencrypted = capability & WLAN_CAPABILITY_PRIVACY ? 1 : 0;
 
 	ieee80211_if_config(sdata, IEEE80211_IFCC_BSSID);
@@ -101,6 +100,12 @@ static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 	local->oper_channel = chan;
 	local->oper_channel_type = NL80211_CHAN_NO_HT;
 	ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
+
+	sdata->vif.bss_conf.beacon_int = beacon_int;
+	bss_change = BSS_CHANGED_BEACON_INT;
+	bss_change |= ieee80211_reset_erp_info(sdata);
+	ieee80211_bss_info_change_notify(sdata, bss_change);
+
 	sband = local->hw.wiphy->bands[chan->band];
 
 	/* Build IBSS probe response */
@@ -111,7 +116,7 @@ static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 	memset(mgmt->da, 0xff, ETH_ALEN);
 	memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 	memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
-	mgmt->u.beacon.beacon_int = cpu_to_le16(local->hw.conf.beacon_int);
+	mgmt->u.beacon.beacon_int = cpu_to_le16(beacon_int);
 	mgmt->u.beacon.timestamp = cpu_to_le64(tsf);
 	mgmt->u.beacon.capab_info = cpu_to_le16(capability);
 
@@ -181,8 +186,13 @@ static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
 				    struct ieee80211_bss *bss)
 {
+	u16 beacon_int = bss->cbss.beacon_interval;
+
+	if (beacon_int < 10)
+		beacon_int = 10;
+
 	__ieee80211_sta_join_ibss(sdata, bss->cbss.bssid,
-				  bss->cbss.beacon_interval,
+				  beacon_int,
 				  bss->cbss.channel,
 				  bss->supp_rates_len, bss->supp_rates,
 				  bss->cbss.capability,
@@ -464,9 +474,6 @@ static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
 
 	sband = local->hw.wiphy->bands[ifibss->channel->band];
 
-	if (local->hw.conf.beacon_int == 0)
-		local->hw.conf.beacon_int = 100;
-
 	capability = WLAN_CAPABILITY_IBSS;
 
 	if (sdata->default_key)
@@ -480,7 +487,7 @@ static void ieee80211_sta_create_ibss(struct ieee80211_sub_if_data *sdata)
 		*pos++ = (u8) (rate / 5);
 	}
 
-	__ieee80211_sta_join_ibss(sdata, bssid, local->hw.conf.beacon_int,
+	__ieee80211_sta_join_ibss(sdata, bssid, sdata->vif.bss_conf.beacon_int,
 				  ifibss->channel, sband->n_bitrates,
 				  supp_rates, capability, 0);
 }
@@ -823,6 +830,8 @@ int ieee80211_ibss_join(struct ieee80211_sub_if_data *sdata,
 	} else
 		sdata->u.ibss.fixed_bssid = false;
 
+	sdata->vif.bss_conf.beacon_int = params->beacon_interval;
+
 	sdata->u.ibss.channel = params->channel;
 	sdata->u.ibss.fixed_channel = params->channel_fixed;
 

net/mac80211/main.c

@@ -294,9 +294,6 @@ void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 {
 	struct ieee80211_local *local = sdata->local;
 
-	if (WARN_ON(sdata->vif.type == NL80211_IFTYPE_AP_VLAN))
-		return;
-
 	if (!changed)
 		return;
 
@@ -305,6 +302,17 @@ void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 					     &sdata->vif,
 					     &sdata->vif.bss_conf,
 					     changed);
+
+	/*
+	 * DEPRECATED
+	 *
+	 * ~changed is just there to not do this at resume time
+	 */
+	if (changed & BSS_CHANGED_BEACON_INT && ~changed) {
+		local->hw.conf.beacon_int = sdata->vif.bss_conf.beacon_int;
+		ieee80211_hw_config(local,
+				    _IEEE80211_CONF_CHANGE_BEACON_INTERVAL);
+	}
 }
 
 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
@@ -971,9 +979,6 @@ int ieee80211_register_hw(struct ieee80211_hw *hw)
 
 	debugfs_hw_add(local);
 
-	if (local->hw.conf.beacon_int < 10)
-		local->hw.conf.beacon_int = 100;
-
 	if (local->hw.max_listen_interval == 0)
 		local->hw.max_listen_interval = 1;
 

net/mac80211/mlme.c

@@ -842,6 +842,7 @@ static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
 		sdata->vif.bss_conf.timestamp = bss->cbss.tsf;
 		sdata->vif.bss_conf.dtim_period = bss->dtim_period;
 
+		bss_info_changed |= BSS_CHANGED_BEACON_INT;
 		bss_info_changed |= ieee80211_handle_bss_capability(sdata,
 			bss->cbss.capability, bss->has_erp_value, bss->erp_value);
 

net/mac80211/sta_info.c

@@ -543,9 +543,8 @@ void sta_info_unlink(struct sta_info **sta)
 	spin_unlock_irqrestore(&local->sta_lock, flags);
 }
 
-static inline int sta_info_buffer_expired(struct ieee80211_local *local,
-					  struct sta_info *sta,
-					  struct sk_buff *skb)
+static int sta_info_buffer_expired(struct sta_info *sta,
+				   struct sk_buff *skb)
 {
 	struct ieee80211_tx_info *info;
 	int timeout;
@@ -556,8 +555,9 @@ static inline int sta_info_buffer_expired(struct ieee80211_local *local,
 	info = IEEE80211_SKB_CB(skb);
 
 	/* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
-	timeout = (sta->listen_interval * local->hw.conf.beacon_int * 32 /
-		   15625) * HZ;
+	timeout = (sta->listen_interval *
+		   sta->sdata->vif.bss_conf.beacon_int *
+		   32 / 15625) * HZ;
 	if (timeout < STA_TX_BUFFER_EXPIRE)
 		timeout = STA_TX_BUFFER_EXPIRE;
 	return time_after(jiffies, info->control.jiffies + timeout);
@@ -577,7 +577,7 @@ static void sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
 	for (;;) {
 		spin_lock_irqsave(&sta->ps_tx_buf.lock, flags);
 		skb = skb_peek(&sta->ps_tx_buf);
-		if (sta_info_buffer_expired(local, sta, skb))
+		if (sta_info_buffer_expired(sta, skb))
 			skb = __skb_dequeue(&sta->ps_tx_buf);
 		else
 			skb = NULL;

net/mac80211/tx.c

@@ -2132,7 +2132,7 @@ struct sk_buff *ieee80211_beacon_get(struct ieee80211_hw *hw,
 		memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
 		/* BSSID is left zeroed, wildcard value */
 		mgmt->u.beacon.beacon_int =
-			cpu_to_le16(local->hw.conf.beacon_int);
+			cpu_to_le16(sdata->vif.bss_conf.beacon_int);
 		mgmt->u.beacon.capab_info = 0x0; /* 0x0 for MPs */
 
 		pos = skb_put(skb, 2);