ath9k: add counters for good and errorneous FFT/spectral frames

This is helpful to see whether spectral samples get discarded.
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/ath/ath9k/common-debug.c

@@ -144,6 +144,8 @@ static ssize_t read_file_recv(struct file *file, char __user *user_buf,
 	RXS_ERR("BEACONS", rx_beacons);
 	RXS_ERR("FRAGS", rx_frags);
 	RXS_ERR("SPECTRAL", rx_spectral);
+	RXS_ERR("SPECTRAL SMPL GOOD", rx_spectral_sample_good);
+	RXS_ERR("SPECTRAL SMPL ERR", rx_spectral_sample_err);
 
 	RXS_ERR("CRC ERR", crc_err);
 	RXS_ERR("DECRYPT CRC ERR", decrypt_crc_err);

drivers/net/wireless/ath/ath9k/common-debug.h

@@ -39,6 +39,8 @@
  * @rx_beacons:  No. of beacons received.
  * @rx_frags:  No. of rx-fragements received.
  * @rx_spectral: No of spectral packets received.
+ * @rx_spectral_sample_good: No. of good spectral samples
+ * @rx_spectral_sample_err: No. of good spectral samples
  */
 struct ath_rx_stats {
 	u32 rx_pkts_all;
@@ -58,6 +60,8 @@ struct ath_rx_stats {
 	u32 rx_beacons;
 	u32 rx_frags;
 	u32 rx_spectral;
+	u32 rx_spectral_sample_good;
+	u32 rx_spectral_sample_err;
 };
 
 #ifdef CONFIG_ATH9K_COMMON_DEBUG

drivers/net/wireless/ath/ath9k/common-spectral.c

@@ -501,6 +501,7 @@ int ath_cmn_process_fft(struct ath_spec_scan_priv *spec_priv, struct ieee80211_h
 	u8 sample_buf[SPECTRAL_SAMPLE_MAX_LEN] = {0};
 	struct ath_hw *ah = spec_priv->ah;
 	struct ath_common *common = ath9k_hw_common(spec_priv->ah);
+	struct ath_softc *sc = (struct ath_softc *)common->priv;
 	u8 num_bins, *vdata = (u8 *)hdr;
 	struct ath_radar_info *radar_info;
 	int len = rs->rs_datalen;
@@ -649,8 +650,13 @@ int ath_cmn_process_fft(struct ath_spec_scan_priv *spec_priv, struct ieee80211_h
 						       sample_buf, sample_len,
 						       sample_bytes);
 
-				fft_handler(rs, spec_priv, sample_buf,
-					    tsf, freq, chan_type);
+				ret = fft_handler(rs, spec_priv, sample_buf,
+						  tsf, freq, chan_type);
+
+				if (ret == 0)
+					RX_STAT_INC(rx_spectral_sample_good);
+				else
+					RX_STAT_INC(rx_spectral_sample_err);
 
 				memset(sample_buf, 0, SPECTRAL_SAMPLE_MAX_LEN);
 
@@ -665,6 +671,11 @@ int ath_cmn_process_fft(struct ath_spec_scan_priv *spec_priv, struct ieee80211_h
 				ret = fft_handler(rs, spec_priv, sample_start,
 						  tsf, freq, chan_type);
 
+				if (ret == 0)
+					RX_STAT_INC(rx_spectral_sample_good);
+				else
+					RX_STAT_INC(rx_spectral_sample_err);
+
 				/* Mix the received bins to the /dev/random
 				 * pool
 				 */