iwlwifi: showing accumulative ucode statistics counters

Adding accumulative statistics counters in iwlwifi driver.
Statistics counters are reported by uCode every beacon interval; but can
be reset by uCode when needed. The accumulative statistics counters is
maintained by driver to keep track of the history of all the counters.

Update the ucode stats files in debugfs to display both latest and
accumulative counters.
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/iwlwifi/iwl-3945.c

@@ -361,8 +361,6 @@ void iwl3945_hw_rx_statistics(struct iwl_priv *priv,
 	memcpy(&priv->statistics_39, pkt->u.raw, sizeof(priv->statistics_39));
 
 	iwl_leds_background(priv);
-
-	priv->last_statistics_time = jiffies;
 }
 
 /******************************************************************************

drivers/net/wireless/iwlwifi/iwl-dev.h

@@ -1124,7 +1124,9 @@ struct iwl_priv {
 	struct iwl_tt_mgmt thermal_throttle;
 
 	struct iwl_notif_statistics statistics;
-	unsigned long last_statistics_time;
+#ifdef CONFIG_IWLWIFI_DEBUG
+	struct iwl_notif_statistics accum_statistics;
+#endif
 
 	/* context information */
 	u16 rates_mask;

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

@@ -548,6 +548,44 @@ static void iwl_rx_calc_noise(struct iwl_priv *priv)
 			priv->last_rx_noise);
 }
 
+#ifdef CONFIG_IWLWIFI_DEBUG
+/*
+ *  based on the assumption of all statistics counter are in DWORD
+ *  FIXME: This function is for debugging, do not deal with
+ *  the case of counters roll-over.
+ */
+static void iwl_accumulative_statistics(struct iwl_priv *priv,
+					__le32 *stats)
+{
+	int i;
+	__le32 *prev_stats;
+	u32 *accum_stats;
+
+	prev_stats = (__le32 *)&priv->statistics;
+	accum_stats = (u32 *)&priv->accum_statistics;
+
+	for (i = sizeof(__le32); i < sizeof(struct iwl_notif_statistics);
+	     i += sizeof(__le32), stats++, prev_stats++, accum_stats++)
+		if (le32_to_cpu(*stats) > le32_to_cpu(*prev_stats))
+			*accum_stats += (le32_to_cpu(*stats) -
+				le32_to_cpu(*prev_stats));
+
+	/* reset accumulative statistics for "no-counter" type statistics */
+	priv->accum_statistics.general.temperature =
+		priv->statistics.general.temperature;
+	priv->accum_statistics.general.temperature_m =
+		priv->statistics.general.temperature_m;
+	priv->accum_statistics.general.ttl_timestamp =
+		priv->statistics.general.ttl_timestamp;
+	priv->accum_statistics.tx.tx_power.ant_a =
+		priv->statistics.tx.tx_power.ant_a;
+	priv->accum_statistics.tx.tx_power.ant_b =
+		priv->statistics.tx.tx_power.ant_b;
+	priv->accum_statistics.tx.tx_power.ant_c =
+		priv->statistics.tx.tx_power.ant_c;
+}
+#endif
+
 #define REG_RECALIB_PERIOD (60)
 
 void iwl_rx_statistics(struct iwl_priv *priv,
@@ -566,6 +604,9 @@ void iwl_rx_statistics(struct iwl_priv *priv,
 		    STATISTICS_REPLY_FLG_HT40_MODE_MSK) !=
 		   (pkt->u.stats.flag & STATISTICS_REPLY_FLG_HT40_MODE_MSK)));
 
+#ifdef CONFIG_IWLWIFI_DEBUG
+	iwl_accumulative_statistics(priv, (__le32 *)&pkt->u.stats);
+#endif
 	memcpy(&priv->statistics, &pkt->u.stats, sizeof(priv->statistics));
 
 	set_bit(STATUS_STATISTICS, &priv->status);