iwlwifi: Add TX/RX statistcs to driver

This patch supports collecting of TX and RX statistics in the driver.
Signed-off-by: Tomas Winkler <tomas.winkler@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-4965.c

@@ -3337,6 +3337,14 @@ static void iwl4965_add_radiotap(struct iwl_priv *priv,
 	stats->flag |= RX_FLAG_RADIOTAP;
 }
 
+static void iwl_update_rx_stats(struct iwl_priv *priv, u16 fc, u16 len)
+{
+	/* 0 - mgmt, 1 - cnt, 2 - data */
+	int idx = (fc & IEEE80211_FCTL_FTYPE) >> 2;
+	priv->rx_stats[idx].cnt++;
+	priv->rx_stats[idx].bytes += len;
+}
+
 static void iwl4965_handle_data_packet(struct iwl_priv *priv, int is_data,
 				       int include_phy,
 				       struct iwl4965_rx_mem_buffer *rxb,
@@ -3406,6 +3414,7 @@ static void iwl4965_handle_data_packet(struct iwl_priv *priv, int is_data,
 	if (priv->add_radiotap)
 		iwl4965_add_radiotap(priv, rxb->skb, rx_start, stats, ampdu_status);
 
+	iwl_update_rx_stats(priv, le16_to_cpu(hdr->frame_control), len);
 	ieee80211_rx_irqsafe(priv->hw, rxb->skb, stats);
 	priv->alloc_rxb_skb--;
 	rxb->skb = NULL;

drivers/net/wireless/iwlwifi/iwl-4965.h

@@ -1107,6 +1107,12 @@ struct iwl_priv {
 	int last_rx_rssi;	/* From Rx packet statisitics */
 	int last_rx_noise;	/* From beacon statistics */
 
+	/* counts mgmt, ctl, and data packets */
+	struct traffic_stats {
+		u32 cnt;
+		u64 bytes;
+	} tx_stats[3], rx_stats[3];
+
 	struct iwl4965_power_mgr power_data;
 
 	struct iwl4965_notif_statistics statistics;

drivers/net/wireless/iwlwifi/iwl4965-base.c

@@ -2529,7 +2529,13 @@ static void iwl4965_build_tx_cmd_basic(struct iwl_priv *priv,
 	cmd->cmd.tx.tx_flags = tx_flags;
 	cmd->cmd.tx.next_frame_len = 0;
 }
-
+static void iwl_update_tx_stats(struct iwl_priv *priv, u16 fc, u16 len)
+{
+	/* 0 - mgmt, 1 - cnt, 2 - data */
+	int idx = (fc & IEEE80211_FCTL_FTYPE) >> 2;
+	priv->tx_stats[idx].cnt++;
+	priv->tx_stats[idx].bytes += len;
+}
 /**
  * iwl4965_get_sta_id - Find station's index within station table
  *
@@ -2776,6 +2782,8 @@ static int iwl4965_tx_skb(struct iwl_priv *priv,
 	/* set is_hcca to 0; it probably will never be implemented */
 	iwl4965_hw_build_tx_cmd_rate(priv, out_cmd, ctl, hdr, sta_id, 0);
 
+	iwl_update_tx_stats(priv, fc, len);
+
 	scratch_phys = txcmd_phys + sizeof(struct iwl4965_cmd_header) +
 		offsetof(struct iwl4965_tx_cmd, scratch);
 	out_cmd->cmd.tx.dram_lsb_ptr = cpu_to_le32(scratch_phys);