wifi: rtw89: add EVM and SNR statistics to debugfs

To help debug performance problem, add EVM and SNR statistics to debugfs
that shows

  EVM: [(26.75, 26.75) (25.75, 25.75)]    SNR: 40

Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20230418012820.5139-5-pkshih@realtek.com

diff --git a/drivers/net/wireless/realtek/rtw89/core.c b/drivers/net/wireless/realtek/rtw89/core.c
index 5271d59..9b1ed52 100644 (file)
--- a/drivers/net/wireless/realtek/rtw89/core.c
+++ b/drivers/net/wireless/realtek/rtw89/core.c
@@ -1247,13 +1247,16 @@ static void rtw89_core_rx_process_phy_ppdu_iter(void *data,
        struct rtw89_hal *hal = &rtwdev->hal;
        u8 ant_num = hal->ant_diversity ? 2 : rtwdev->chip->rf_path_num;
        u8 ant_pos = U8_MAX;
+       u8 evm_pos = 0;
        int i;
 
        if (rtwsta->mac_id != phy_ppdu->mac_id || !phy_ppdu->to_self)
                return;
 
-       if (hal->ant_diversity && hal->antenna_rx)
+       if (hal->ant_diversity && hal->antenna_rx) {
                ant_pos = __ffs(hal->antenna_rx);
+               evm_pos = ant_pos;
+       }
 
        ewma_rssi_add(&rtwsta->avg_rssi, phy_ppdu->rssi_avg);
 
@@ -1263,6 +1266,12 @@ static void rtw89_core_rx_process_phy_ppdu_iter(void *data,
                for (i = 0; i < rtwdev->chip->rf_path_num; i++)
                        ewma_rssi_add(&rtwsta->rssi[i], phy_ppdu->rssi[i]);
        }
+
+       if (phy_ppdu->ofdm.has) {
+               ewma_snr_add(&rtwsta->avg_snr, phy_ppdu->ofdm.avg_snr);
+               ewma_evm_add(&rtwsta->evm_min[evm_pos], phy_ppdu->ofdm.evm_min);
+               ewma_evm_add(&rtwsta->evm_max[evm_pos], phy_ppdu->ofdm.evm_max);
+       }
 }
 
 #define VAR_LEN 0xff
@@ -1300,6 +1309,11 @@ static void rtw89_core_parse_phy_status_ie01(struct rtw89_dev *rtwdev, u8 *addr,
        if (!phy_ppdu->to_self)
                return;
 
+       phy_ppdu->ofdm.avg_snr = le32_get_bits(ie->w2, RTW89_PHY_STS_IE01_W2_AVG_SNR);
+       phy_ppdu->ofdm.evm_max = le32_get_bits(ie->w2, RTW89_PHY_STS_IE01_W2_EVM_MAX);
+       phy_ppdu->ofdm.evm_min = le32_get_bits(ie->w2, RTW89_PHY_STS_IE01_W2_EVM_MIN);
+       phy_ppdu->ofdm.has = true;
+
        /* sign conversion for S(12,2) */
        if (rtwdev->chip->cfo_src_fd) {
                t = le32_get_bits(ie->w1, RTW89_PHY_STS_IE01_W1_FD_CFO);
@@ -1350,9 +1364,6 @@ static int rtw89_core_rx_process_phy_ppdu(struct rtw89_dev *rtwdev,
                return -EINVAL;
        }
        rtw89_core_update_phy_ppdu(phy_ppdu);
-       ieee80211_iterate_stations_atomic(rtwdev->hw,
-                                         rtw89_core_rx_process_phy_ppdu_iter,
-                                         phy_ppdu);
 
        return 0;
 }
@@ -1393,6 +1404,10 @@ static void rtw89_core_rx_process_phy_sts(struct rtw89_dev *rtwdev,
                rtw89_debug(rtwdev, RTW89_DBG_TXRX, "parse phy sts failed\n");
        else
                phy_ppdu->valid = true;
+
+       ieee80211_iterate_stations_atomic(rtwdev->hw,
+                                         rtw89_core_rx_process_phy_ppdu_iter,
+                                         phy_ppdu);
 }
 
 static u8 rtw89_rxdesc_to_nl_he_gi(struct rtw89_dev *rtwdev,
@@ -2791,8 +2806,12 @@ int rtw89_core_sta_add(struct rtw89_dev *rtwdev,
                rtw89_core_txq_init(rtwdev, sta->txq[i]);
 
        ewma_rssi_init(&rtwsta->avg_rssi);
-       for (i = 0; i < ant_num; i++)
+       ewma_snr_init(&rtwsta->avg_snr);
+       for (i = 0; i < ant_num; i++) {
                ewma_rssi_init(&rtwsta->rssi[i]);
+               ewma_evm_init(&rtwsta->evm_min[i]);
+               ewma_evm_init(&rtwsta->evm_max[i]);
+       }
 
        if (vif->type == NL80211_IFTYPE_STATION && !sta->tdls) {
                /* for station mode, assign the mac_id from itself */

diff --git a/drivers/net/wireless/realtek/rtw89/core.h b/drivers/net/wireless/realtek/rtw89/core.h
index 38c361d..7e7bece 100644 (file)
--- a/drivers/net/wireless/realtek/rtw89/core.h
+++ b/drivers/net/wireless/realtek/rtw89/core.h
@@ -551,6 +551,12 @@ struct rtw89_rx_phy_ppdu {
        u8 chan_idx;
        u8 ie;
        u16 rate;
+       struct {
+               bool has;
+               u8 avg_snr;
+               u8 evm_max;
+               u8 evm_min;
+       } ofdm;
        bool to_self;
        bool valid;
 };
@@ -2533,6 +2539,8 @@ struct rtw89_ra_report {
 };
 
 DECLARE_EWMA(rssi, 10, 16);
+DECLARE_EWMA(evm, 10, 16);
+DECLARE_EWMA(snr, 10, 16);
 
 struct rtw89_ba_cam_entry {
        struct list_head list;
@@ -2595,6 +2603,9 @@ struct rtw89_sta {
        u8 prev_rssi;
        struct ewma_rssi avg_rssi;
        struct ewma_rssi rssi[RF_PATH_MAX];
+       struct ewma_snr avg_snr;
+       struct ewma_evm evm_min[RF_PATH_MAX];
+       struct ewma_evm evm_max[RF_PATH_MAX];
        struct rtw89_ampdu_params ampdu_params[IEEE80211_NUM_TIDS];
        struct ieee80211_rx_status rx_status;
        u16 rx_hw_rate;

diff --git a/drivers/net/wireless/realtek/rtw89/debug.c b/drivers/net/wireless/realtek/rtw89/debug.c
index bc5ea97..6f418f1 100644 (file)
--- a/drivers/net/wireless/realtek/rtw89/debug.c
+++ b/drivers/net/wireless/realtek/rtw89/debug.c
@@ -3208,7 +3208,9 @@ static void rtw89_sta_info_get_iter(void *data, struct ieee80211_sta *sta)
        struct rtw89_hal *hal = &rtwdev->hal;
        u8 ant_num = hal->ant_diversity ? 2 : rtwdev->chip->rf_path_num;
        bool ant_asterisk = hal->tx_path_diversity || hal->ant_diversity;
+       u8 evm_min, evm_max;
        u8 rssi;
+       u8 snr;
        int i;
 
        seq_printf(m, "TX rate [%d]: ", rtwsta->mac_id);
@@ -3265,6 +3267,20 @@ static void rtw89_sta_info_get_iter(void *data, struct ieee80211_sta *sta)
                           i + 1 == ant_num ? "" : ", ");
        }
        seq_puts(m, "]\n");
+
+       seq_puts(m, "EVM: [");
+       for (i = 0; i < (hal->ant_diversity ? 2 : 1); i++) {
+               evm_min = ewma_evm_read(&rtwsta->evm_min[i]);
+               evm_max = ewma_evm_read(&rtwsta->evm_max[i]);
+
+               seq_printf(m, "%s(%2u.%02u, %2u.%02u)", i == 0 ? "" : " ",
+                          evm_min >> 2, (evm_min & 0x3) * 25,
+                          evm_max >> 2, (evm_max & 0x3) * 25);
+       }
+       seq_puts(m, "]\t");
+
+       snr = ewma_snr_read(&rtwsta->avg_snr);
+       seq_printf(m, "SNR: %u\n", snr);
 }
 
 static void

diff --git a/drivers/net/wireless/realtek/rtw89/txrx.h b/drivers/net/wireless/realtek/rtw89/txrx.h
index 5c05027..d880ecb 100644 (file)
--- a/drivers/net/wireless/realtek/rtw89/txrx.h
+++ b/drivers/net/wireless/realtek/rtw89/txrx.h
@@ -308,6 +308,9 @@ struct rtw89_phy_sts_ie0 {
 #define RTW89_PHY_STS_IE01_W0_CH_IDX GENMASK(23, 16)
 #define RTW89_PHY_STS_IE01_W1_FD_CFO GENMASK(19, 8)
 #define RTW89_PHY_STS_IE01_W1_PREMB_CFO GENMASK(31, 20)
+#define RTW89_PHY_STS_IE01_W2_AVG_SNR GENMASK(5, 0)
+#define RTW89_PHY_STS_IE01_W2_EVM_MAX GENMASK(15, 8)
+#define RTW89_PHY_STS_IE01_W2_EVM_MIN GENMASK(23, 16)
 
 enum rtw89_tx_channel {
        RTW89_TXCH_ACH0 = 0,