mac80211: use DECLARE_EWMA

Instead of using the out-of-line average calculation, use the new
DECLARE_EWMA() macro to declare a signal EWMA, and use that.

This actually *reduces* the code size slightly (on x86-64) while
also reducing the station info size by 80 bytes.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/Kconfig

@@ -7,7 +7,6 @@ config MAC80211
 	select CRYPTO_CCM
 	select CRYPTO_GCM
 	select CRC32
-	select AVERAGE
 	---help---
 	  This option enables the hardware independent IEEE 802.11
 	  networking stack.

net/mac80211/mesh_plink.c

@@ -60,7 +60,7 @@ static bool rssi_threshold_check(struct ieee80211_sub_if_data *sdata,
 {
 	s32 rssi_threshold = sdata->u.mesh.mshcfg.rssi_threshold;
 	return rssi_threshold == 0 ||
-	       (sta && (s8) -ewma_read(&sta->avg_signal) > rssi_threshold);
+	       (sta && (s8) -ewma_signal_read(&sta->avg_signal) > rssi_threshold);
 }
 
 /**

net/mac80211/rx.c

@@ -1428,7 +1428,7 @@ ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
 	sta->rx_bytes += rx->skb->len;
 	if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) {
 		sta->last_signal = status->signal;
-		ewma_add(&sta->avg_signal, -status->signal);
+		ewma_signal_add(&sta->avg_signal, -status->signal);
 	}
 
 	if (status->chains) {
@@ -1440,7 +1440,7 @@ ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx)
 				continue;
 
 			sta->chain_signal_last[i] = signal;
-			ewma_add(&sta->chain_signal_avg[i], -signal);
+			ewma_signal_add(&sta->chain_signal_avg[i], -signal);
 		}
 	}
 

net/mac80211/sta_info.c

@@ -341,9 +341,9 @@ struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
 
 	ktime_get_ts(&uptime);
 	sta->last_connected = uptime.tv_sec;
-	ewma_init(&sta->avg_signal, 1024, 8);
+	ewma_signal_init(&sta->avg_signal);
 	for (i = 0; i < ARRAY_SIZE(sta->chain_signal_avg); i++)
-		ewma_init(&sta->chain_signal_avg[i], 1024, 8);
+		ewma_signal_init(&sta->chain_signal_avg[i]);
 
 	if (local->ops->wake_tx_queue) {
 		void *txq_data;
@@ -1896,7 +1896,8 @@ void sta_set_sinfo(struct sta_info *sta, struct station_info *sinfo)
 		}
 
 		if (!(sinfo->filled & BIT(NL80211_STA_INFO_SIGNAL_AVG))) {
-			sinfo->signal_avg = (s8) -ewma_read(&sta->avg_signal);
+			sinfo->signal_avg =
+				(s8) -ewma_signal_read(&sta->avg_signal);
 			sinfo->filled |= BIT(NL80211_STA_INFO_SIGNAL_AVG);
 		}
 	}
@@ -1911,7 +1912,7 @@ void sta_set_sinfo(struct sta_info *sta, struct station_info *sinfo)
 		for (i = 0; i < ARRAY_SIZE(sinfo->chain_signal); i++) {
 			sinfo->chain_signal[i] = sta->chain_signal_last[i];
 			sinfo->chain_signal_avg[i] =
-				(s8) -ewma_read(&sta->chain_signal_avg[i]);
+				(s8) -ewma_signal_read(&sta->chain_signal_avg[i]);
 		}
 	}
 

net/mac80211/sta_info.h

@@ -320,6 +320,8 @@ struct mesh_sta {
 	unsigned int fail_avg;
 };
 
+DECLARE_EWMA(signal, 1024, 8)
+
 /**
  * struct sta_info - STA information
  *
@@ -462,12 +464,12 @@ struct sta_info {
 	unsigned long rx_fragments;
 	unsigned long rx_dropped;
 	int last_signal;
-	struct ewma avg_signal;
+	struct ewma_signal avg_signal;
 	int last_ack_signal;
 
 	u8 chains;
 	s8 chain_signal_last[IEEE80211_MAX_CHAINS];
-	struct ewma chain_signal_avg[IEEE80211_MAX_CHAINS];
+	struct ewma_signal chain_signal_avg[IEEE80211_MAX_CHAINS];
 
 	/* Plus 1 for non-QoS frames */
 	__le16 last_seq_ctrl[IEEE80211_NUM_TIDS + 1];