1 files changed, 186 insertions, 131 deletions

diff --git a/drivers/net/wireless/ath/ath9k/rc.c b/drivers/net/wireless/ath/ath9k/rc.c
index e49be733d546..ba7f36ab0a74 100644
--- a/drivers/net/wireless/ath/ath9k/rc.c
+++ b/drivers/net/wireless/ath/ath9k/rc.c
@@ -1,6 +1,6 @@
 /*
  * Copyright (c) 2004 Video54 Technologies, Inc.
- * Copyright (c) 2004-2009 Atheros Communications, Inc.
+ * Copyright (c) 2004-2011 Atheros Communications, Inc.
  *
  * Permission to use, copy, modify, and/or distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -302,7 +302,7 @@ static const struct ath_rate_table ar5416_11ng_ratetable = {
                 [64] = {  RC_INVALID, WLAN_RC_PHY_HT_40_TS, 243000,
                         205100, 20, 20, 8, 64, 65, 65 }, /* 243 Mb */
                 [65] = {  RC_INVALID, WLAN_RC_PHY_HT_40_TS_HGI, 270000,
-                        224700, 20, 20, 8, 64, 65, 65 }, /* 170 Mb */
+                        224700, 20, 20, 8, 64, 65, 65 }, /* 270 Mb */
                 [66] = {  RC_HT_T_40, WLAN_RC_PHY_HT_40_TS, 324000,
                         263100, 21, 21, 8, 66, 67, 67 }, /* 324 Mb */
                 [67] = {  RC_HT_T_40, WLAN_RC_PHY_HT_40_TS_HGI, 360000,
@@ -378,39 +378,9 @@ static const struct ath_rate_table ar5416_11g_ratetable = {
         0,   /* Phy rates allowed initially */
 };
 
-static const struct ath_rate_table *hw_rate_table[ATH9K_MODE_MAX] = {
-        [ATH9K_MODE_11A] = &ar5416_11a_ratetable,
-        [ATH9K_MODE_11G] = &ar5416_11g_ratetable,
-        [ATH9K_MODE_11NA_HT20] = &ar5416_11na_ratetable,
-        [ATH9K_MODE_11NG_HT20] = &ar5416_11ng_ratetable,
-        [ATH9K_MODE_11NA_HT40PLUS] = &ar5416_11na_ratetable,
-        [ATH9K_MODE_11NA_HT40MINUS] = &ar5416_11na_ratetable,
-        [ATH9K_MODE_11NG_HT40PLUS] = &ar5416_11ng_ratetable,
-        [ATH9K_MODE_11NG_HT40MINUS] = &ar5416_11ng_ratetable,
-};
-
 static int ath_rc_get_rateindex(const struct ath_rate_table *rate_table,
                                 struct ieee80211_tx_rate *rate);
 
-static inline int8_t median(int8_t a, int8_t b, int8_t c)
-{
-        if (a >= b) {
-                if (b >= c)
-                        return b;
-                else if (a > c)
-                        return c;
-                else
-                        return a;
-        } else {
-                if (a >= c)
-                        return a;
-                else if (b >= c)
-                        return c;
-                else
-                        return b;
-        }
-}
-
 static void ath_rc_sort_validrates(const struct ath_rate_table *rate_table,
                                    struct ath_rate_priv *ath_rc_priv)
 {
@@ -430,7 +400,7 @@ static void ath_rc_sort_validrates(const struct ath_rate_table *rate_table,
         }
 }
 
-static void ath_rc_init_valid_txmask(struct ath_rate_priv *ath_rc_priv)
+static void ath_rc_init_valid_rate_idx(struct ath_rate_priv *ath_rc_priv)
 {
         u8 i;
 
@@ -438,7 +408,7 @@ static void ath_rc_init_valid_txmask(struct ath_rate_priv *ath_rc_priv)
                 ath_rc_priv->valid_rate_index[i] = 0;
 }
 
-static inline void ath_rc_set_valid_txmask(struct ath_rate_priv *ath_rc_priv,
+static inline void ath_rc_set_valid_rate_idx(struct ath_rate_priv *ath_rc_priv,
                                            u8 index, int valid_tx_rate)
 {
         BUG_ON(index > ath_rc_priv->rate_table_size);
@@ -519,7 +489,7 @@ static u8 ath_rc_init_validrates(struct ath_rate_priv *ath_rc_priv,
 
                         ath_rc_priv->valid_phy_rateidx[phy][valid_rate_count] = i;
                         ath_rc_priv->valid_phy_ratecnt[phy] += 1;
-                        ath_rc_set_valid_txmask(ath_rc_priv, i, 1);
+                        ath_rc_set_valid_rate_idx(ath_rc_priv, i, 1);
                         hi = i;
                 }
         }
@@ -538,7 +508,7 @@ static u8 ath_rc_setvalid_rates(struct ath_rate_priv *ath_rc_priv,
         for (i = 0; i < rateset->rs_nrates; i++) {
                 for (j = 0; j < rate_table->rate_cnt; j++) {
                         u32 phy = rate_table->info[j].phy;
-                        u16 rate_flags = rate_table->info[i].rate_flags;
+                        u16 rate_flags = rate_table->info[j].rate_flags;
                         u8 rate = rateset->rs_rates[i];
                         u8 dot11rate = rate_table->info[j].dot11rate;
 
@@ -562,7 +532,7 @@ static u8 ath_rc_setvalid_rates(struct ath_rate_priv *ath_rc_priv,
                                 ath_rc_priv->valid_phy_rateidx[phy]
                                         [valid_rate_count] = j;
                                 ath_rc_priv->valid_phy_ratecnt[phy] += 1;
-                                ath_rc_set_valid_txmask(ath_rc_priv, j, 1);
+                                ath_rc_set_valid_rate_idx(ath_rc_priv, j, 1);
                                 hi = A_MAX(hi, j);
                         }
                 }
@@ -598,7 +568,7 @@ static u8 ath_rc_setvalid_htrates(struct ath_rate_priv *ath_rc_priv,
                         ath_rc_priv->valid_phy_rateidx[phy]
                                 [ath_rc_priv->valid_phy_ratecnt[phy]] = j;
                         ath_rc_priv->valid_phy_ratecnt[phy] += 1;
-                        ath_rc_set_valid_txmask(ath_rc_priv, j, 1);
+                        ath_rc_set_valid_rate_idx(ath_rc_priv, j, 1);
                         hi = A_MAX(hi, j);
                 }
         }
@@ -719,7 +689,8 @@ static void ath_rc_rate_set_series(const struct ath_rate_table *rate_table,
 
         if (WLAN_RC_PHY_HT(rate_table->info[rix].phy)) {
                 rate->flags |= IEEE80211_TX_RC_MCS;
-                if (WLAN_RC_PHY_40(rate_table->info[rix].phy))
+                if (WLAN_RC_PHY_40(rate_table->info[rix].phy) &&
+                    conf_is_ht40(&txrc->hw->conf))
                         rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
                 if (WLAN_RC_PHY_SGI(rate_table->info[rix].phy))
                         rate->flags |= IEEE80211_TX_RC_SHORT_GI;
@@ -791,7 +762,7 @@ static void ath_get_rate(void *priv, struct ieee80211_sta *sta, void *priv_sta,
          */
         try_per_rate = 4;
 
-        rate_table = sc->cur_rate_table;
+        rate_table = ath_rc_priv->rate_table;
         rix = ath_rc_get_highest_rix(sc, ath_rc_priv, rate_table, &is_probe);
 
         /*
@@ -822,7 +793,7 @@ static void ath_get_rate(void *priv, struct ieee80211_sta *sta, void *priv_sta,
 
                 tx_info->flags |= IEEE80211_TX_CTL_RATE_CTRL_PROBE;
         } else {
-                /* Set the choosen rate. No RTS for first series entry. */
+                /* Set the chosen rate. No RTS for first series entry. */
                 ath_rc_rate_set_series(rate_table, &rates[i++], txrc,
                                        try_per_rate, rix, 0);
         }
@@ -884,17 +855,16 @@ static void ath_get_rate(void *priv, struct ieee80211_sta *sta, void *priv_sta,
         ath_rc_rate_set_rtscts(sc, rate_table, tx_info);
 }
 
-static bool ath_rc_update_per(struct ath_softc *sc,
+static void ath_rc_update_per(struct ath_softc *sc,
                               const struct ath_rate_table *rate_table,
                               struct ath_rate_priv *ath_rc_priv,
                                   struct ieee80211_tx_info *tx_info,
                               int tx_rate, int xretries, int retries,
                               u32 now_msec)
 {
-        bool state_change = false;
         int count, n_bad_frames;
         u8 last_per;
-        static u32 nretry_to_per_lookup[10] = {
+        static const u32 nretry_to_per_lookup[10] = {
                 100 * 0 / 1,
                 100 * 1 / 4,
                 100 * 1 / 2,
@@ -1022,8 +992,16 @@ static bool ath_rc_update_per(struct ath_softc *sc,
 
                 }
         }
+}
 
-        return state_change;
+static void ath_debug_stat_retries(struct ath_rate_priv *rc, int rix,
+                                   int xretries, int retries, u8 per)
+{
+        struct ath_rc_stats *stats = &rc->rcstats[rix];
+
+        stats->xretries += xretries;
+        stats->retries += retries;
+        stats->per = per;
 }
 
 /* Update PER, RSSI and whatever else that the code thinks it is doing.
@@ -1037,8 +1015,7 @@ static void ath_rc_update_ht(struct ath_softc *sc,
         u32 now_msec = jiffies_to_msecs(jiffies);
         int rate;
         u8 last_per;
-        bool state_change = false;
-        const struct ath_rate_table *rate_table = sc->cur_rate_table;
+        const struct ath_rate_table *rate_table = ath_rc_priv->rate_table;
         int size = ath_rc_priv->rate_table_size;
 
         if ((tx_rate < 0) || (tx_rate > rate_table->rate_cnt))
@@ -1047,9 +1024,9 @@ static void ath_rc_update_ht(struct ath_softc *sc,
         last_per = ath_rc_priv->per[tx_rate];
 
         /* Update PER first */
-        state_change = ath_rc_update_per(sc, rate_table, ath_rc_priv,
-                                         tx_info, tx_rate, xretries,
-                                         retries, now_msec);
+        ath_rc_update_per(sc, rate_table, ath_rc_priv,
+                          tx_info, tx_rate, xretries,
+                          retries, now_msec);
 
         /*
          * If this rate looks bad (high PER) then stop using it for
@@ -1098,7 +1075,7 @@ static void ath_rc_update_ht(struct ath_softc *sc,
                 ath_rc_priv->per_down_time = now_msec;
         }
 
-        ath_debug_stat_retries(sc, tx_rate, xretries, retries,
+        ath_debug_stat_retries(ath_rc_priv, tx_rate, xretries, retries,
                                ath_rc_priv->per[tx_rate]);
 
 }
@@ -1107,13 +1084,12 @@ static int ath_rc_get_rateindex(const struct ath_rate_table *rate_table,
                                 struct ieee80211_tx_rate *rate)
 {
         int rix = 0, i = 0;
-        int mcs_rix_off[] = { 7, 15, 20, 21, 22, 23 };
+        static const int mcs_rix_off[] = { 7, 15, 20, 21, 22, 23 };
 
         if (!(rate->flags & IEEE80211_TX_RC_MCS))
                 return rate->idx;
 
-        while (rate->idx > mcs_rix_off[i] &&
-              i < sizeof(mcs_rix_off)/sizeof(int)) {
+        while (i < ARRAY_SIZE(mcs_rix_off) && rate->idx > mcs_rix_off[i]) {
                 rix++; i++;
         }
 
@@ -1140,7 +1116,7 @@ static void ath_rc_tx_status(struct ath_softc *sc,
         u8 flags;
         u32 i = 0, rix;
 
-        rate_table = sc->cur_rate_table;
+        rate_table = ath_rc_priv->rate_table;
 
         /*
          * If the first rate is not the final index, there
@@ -1190,39 +1166,23 @@ static void ath_rc_tx_status(struct ath_softc *sc,
 static const
 struct ath_rate_table *ath_choose_rate_table(struct ath_softc *sc,
                                              enum ieee80211_band band,
-                                             bool is_ht,
-                                             bool is_cw_40)
+                                             bool is_ht)
 {
-        int mode = 0;
         struct ath_common *common = ath9k_hw_common(sc->sc_ah);
 
         switch(band) {
         case IEEE80211_BAND_2GHZ:
-                mode = ATH9K_MODE_11G;
                 if (is_ht)
-                        mode = ATH9K_MODE_11NG_HT20;
-                if (is_cw_40)
-                        mode = ATH9K_MODE_11NG_HT40PLUS;
-                break;
+                        return &ar5416_11ng_ratetable;
+                return &ar5416_11g_ratetable;
         case IEEE80211_BAND_5GHZ:
-                mode = ATH9K_MODE_11A;
                 if (is_ht)
-                        mode = ATH9K_MODE_11NA_HT20;
-                if (is_cw_40)
-                        mode = ATH9K_MODE_11NA_HT40PLUS;
-                break;
+                        return &ar5416_11na_ratetable;
+                return &ar5416_11a_ratetable;
         default:
-                ath_print(common, ATH_DBG_CONFIG, "Invalid band\n");
+                ath_dbg(common, ATH_DBG_CONFIG, "Invalid band\n");
                 return NULL;
         }
-
-        BUG_ON(mode >= ATH9K_MODE_MAX);
-
-        ath_print(common, ATH_DBG_CONFIG,
-                  "Choosing rate table for mode: %d\n", mode);
-
-        sc->cur_rate_mode = mode;
-        return hw_rate_table[mode];
 }
 
 static void ath_rc_init(struct ath_softc *sc,
@@ -1246,7 +1206,7 @@ static void ath_rc_init(struct ath_softc *sc,
         }
 
         /* Determine the valid rates */
-        ath_rc_init_valid_txmask(ath_rc_priv);
+        ath_rc_init_valid_rate_idx(ath_rc_priv);
 
         for (i = 0; i < WLAN_RC_PHY_MAX; i++) {
                 for (j = 0; j < MAX_TX_RATE_PHY; j++)
@@ -1293,11 +1253,11 @@ static void ath_rc_init(struct ath_softc *sc,
         ath_rc_priv->max_valid_rate = k;
         ath_rc_sort_validrates(rate_table, ath_rc_priv);
         ath_rc_priv->rate_max_phy = ath_rc_priv->valid_rate_index[k-4];
-        sc->cur_rate_table = rate_table;
+        ath_rc_priv->rate_table = rate_table;
 
-        ath_print(common, ATH_DBG_CONFIG,
-                  "RC Initialized with capabilities: 0x%x\n",
-                  ath_rc_priv->ht_cap);
+        ath_dbg(common, ATH_DBG_CONFIG,
+                "RC Initialized with capabilities: 0x%x\n",
+                ath_rc_priv->ht_cap);
 }
 
 static u8 ath_rc_build_ht_caps(struct ath_softc *sc, struct ieee80211_sta *sta,
@@ -1320,10 +1280,35 @@ static u8 ath_rc_build_ht_caps(struct ath_softc *sc, struct ieee80211_sta *sta,
         return caps;
 }
 
+static bool ath_tx_aggr_check(struct ath_softc *sc, struct ath_node *an,
+                              u8 tidno)
+{
+        struct ath_atx_tid *txtid;
+
+        if (!(sc->sc_flags & SC_OP_TXAGGR))
+                return false;
+
+        txtid = ATH_AN_2_TID(an, tidno);
+
+        if (!(txtid->state & (AGGR_ADDBA_COMPLETE | AGGR_ADDBA_PROGRESS)))
+                        return true;
+        return false;
+}
+
+
 /***********************************/
 /* mac80211 Rate Control callbacks */
 /***********************************/
 
+static void ath_debug_stat_rc(struct ath_rate_priv *rc, int final_rate)
+{
+        struct ath_rc_stats *stats;
+
+        stats = &rc->rcstats[final_rate];
+        stats->success++;
+}
+
+
 static void ath_tx_status(void *priv, struct ieee80211_supported_band *sband,
                           struct ieee80211_sta *sta, void *priv_sta,
                           struct sk_buff *skb)
@@ -1332,14 +1317,14 @@ static void ath_tx_status(void *priv, struct ieee80211_supported_band *sband,
         struct ath_rate_priv *ath_rc_priv = priv_sta;
         struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
         struct ieee80211_hdr *hdr;
-        int final_ts_idx = 0, tx_status = 0, is_underrun = 0;
+        int final_ts_idx = 0, tx_status = 0;
         int long_retry = 0;
         __le16 fc;
         int i;
 
         hdr = (struct ieee80211_hdr *)skb->data;
         fc = hdr->frame_control;
-        for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
+        for (i = 0; i < sc->hw->max_rates; i++) {
                 struct ieee80211_tx_rate *rate = &tx_info->status.rates[i];
                 if (!rate->count)
                         break;
@@ -1359,32 +1344,23 @@ static void ath_tx_status(void *priv, struct ieee80211_supported_band *sband,
         if (tx_info->flags & IEEE80211_TX_STAT_TX_FILTERED)
                 return;
 
-        /*
-         * If an underrun error is seen assume it as an excessive retry only
-         * if max frame trigger level has been reached (2 KB for singel stream,
-         * and 4 KB for dual stream). Adjust the long retry as if the frame was
-         * tried hw->max_rate_tries times to affect how ratectrl updates PER for
-         * the failed rate. In case of congestion on the bus penalizing these
-         * type of underruns should help hardware actually transmit new frames
-         * successfully by eventually preferring slower rates. This itself
-         * should also alleviate congestion on the bus.
-         */
-        if ((tx_info->pad[0] & ATH_TX_INFO_UNDERRUN) &&
-            (sc->sc_ah->tx_trig_level >= ath_rc_priv->tx_triglevel_max)) {
-                tx_status = 1;
-                is_underrun = 1;
+        if (!(tx_info->flags & IEEE80211_TX_STAT_AMPDU)) {
+                tx_info->status.ampdu_ack_len =
+                        (tx_info->flags & IEEE80211_TX_STAT_ACK ? 1 : 0);
+                tx_info->status.ampdu_len = 1;
         }
 
-        if (tx_info->pad[0] & ATH_TX_INFO_XRETRY)
+        if (!(tx_info->flags & IEEE80211_TX_STAT_ACK))
                 tx_status = 1;
 
         ath_rc_tx_status(sc, ath_rc_priv, tx_info, final_ts_idx, tx_status,
-                         (is_underrun) ? sc->hw->max_rate_tries : long_retry);
+                         long_retry);
 
         /* Check if aggregation has to be enabled for this tid */
         if (conf_is_ht(&sc->hw->conf) &&
             !(skb->protocol == cpu_to_be16(ETH_P_PAE))) {
-                if (ieee80211_is_data_qos(fc)) {
+                if (ieee80211_is_data_qos(fc) &&
+                    skb_get_queue_mapping(skb) != IEEE80211_AC_VO) {
                         u8 *qc, tid;
                         struct ath_node *an;
 
@@ -1393,12 +1369,13 @@ static void ath_tx_status(void *priv, struct ieee80211_supported_band *sband,
                         an = (struct ath_node *)sta->drv_priv;
 
                         if(ath_tx_aggr_check(sc, an, tid))
-                                ieee80211_start_tx_ba_session(sta, tid);
+                                ieee80211_start_tx_ba_session(sta, tid, 0);
                 }
         }
 
-        ath_debug_stat_rc(sc, ath_rc_get_rateindex(sc->cur_rate_table,
-                &tx_info->status.rates[final_ts_idx]));
+        ath_debug_stat_rc(ath_rc_priv,
+                ath_rc_get_rateindex(ath_rc_priv->rate_table,
+                        &tx_info->status.rates[final_ts_idx]));
 }
 
 static void ath_rate_init(void *priv, struct ieee80211_supported_band *sband,
@@ -1429,23 +1406,17 @@ static void ath_rate_init(void *priv, struct ieee80211_supported_band *sband,
                 ath_rc_priv->neg_ht_rates.rs_nrates = j;
         }
 
-        is_cw40 = sta->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40;
+        is_cw40 = !!(sta->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40);
 
         if (is_cw40)
-                is_sgi = sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_40;
+                is_sgi = !!(sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_40);
         else if (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_SGI_20)
-                is_sgi = sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_20;
+                is_sgi = !!(sta->ht_cap.cap & IEEE80211_HT_CAP_SGI_20);
 
         /* Choose rate table first */
 
-        if ((sc->sc_ah->opmode == NL80211_IFTYPE_STATION) ||
-            (sc->sc_ah->opmode == NL80211_IFTYPE_MESH_POINT) ||
-            (sc->sc_ah->opmode == NL80211_IFTYPE_ADHOC)) {
-                rate_table = ath_choose_rate_table(sc, sband->band,
-                                      sta->ht_cap.ht_supported, is_cw40);
-        } else {
-                rate_table = hw_rate_table[sc->cur_rate_mode];
-        }
+        rate_table = ath_choose_rate_table(sc, sband->band,
+                              sta->ht_cap.ht_supported);
 
         ath_rc_priv->ht_cap = ath_rc_build_ht_caps(sc, sta, is_cw40, is_sgi);
         ath_rc_init(sc, priv_sta, sband, sta, rate_table);
@@ -1459,10 +1430,8 @@ static void ath_rate_update(void *priv, struct ieee80211_supported_band *sband,
         struct ath_rate_priv *ath_rc_priv = priv_sta;
         const struct ath_rate_table *rate_table = NULL;
         bool oper_cw40 = false, oper_sgi;
-        bool local_cw40 = (ath_rc_priv->ht_cap & WLAN_RC_40_FLAG) ?
-                true : false;
-        bool local_sgi = (ath_rc_priv->ht_cap & WLAN_RC_SGI_FLAG) ?
-                true : false;
+        bool local_cw40 = !!(ath_rc_priv->ht_cap & WLAN_RC_40_FLAG);
+        bool local_sgi = !!(ath_rc_priv->ht_cap & WLAN_RC_SGI_FLAG);
 
         /* FIXME: Handle AP mode later when we support CWM */
 
@@ -1485,24 +1454,109 @@ static void ath_rate_update(void *priv, struct ieee80211_supported_band *sband,
 
                 if ((local_cw40 != oper_cw40) || (local_sgi != oper_sgi)) {
                         rate_table = ath_choose_rate_table(sc, sband->band,
-                                                   sta->ht_cap.ht_supported,
-                                                   oper_cw40);
+                                                   sta->ht_cap.ht_supported);
                         ath_rc_priv->ht_cap = ath_rc_build_ht_caps(sc, sta,
                                                    oper_cw40, oper_sgi);
                         ath_rc_init(sc, priv_sta, sband, sta, rate_table);
 
-                        ath_print(ath9k_hw_common(sc->sc_ah), ATH_DBG_CONFIG,
-                                  "Operating HT Bandwidth changed to: %d\n",
-                                  sc->hw->conf.channel_type);
-                        sc->cur_rate_table = hw_rate_table[sc->cur_rate_mode];
+                        ath_dbg(ath9k_hw_common(sc->sc_ah), ATH_DBG_CONFIG,
+                                "Operating HT Bandwidth changed to: %d\n",
+                                sc->hw->conf.channel_type);
+                }
+        }
+}
+
+#ifdef CONFIG_ATH9K_DEBUGFS
+
+static int ath9k_debugfs_open(struct inode *inode, struct file *file)
+{
+        file->private_data = inode->i_private;
+        return 0;
+}
+
+static ssize_t read_file_rcstat(struct file *file, char __user *user_buf,
+                                size_t count, loff_t *ppos)
+{
+        struct ath_rate_priv *rc = file->private_data;
+        char *buf;
+        unsigned int len = 0, max;
+        int i = 0;
+        ssize_t retval;
+
+        if (rc->rate_table == NULL)
+                return 0;
+
+        max = 80 + rc->rate_table->rate_cnt * 1024 + 1;
+        buf = kmalloc(max, GFP_KERNEL);
+        if (buf == NULL)
+                return -ENOMEM;
+
+        len += sprintf(buf, "%6s %6s %6s "
+                       "%10s %10s %10s %10s\n",
+                       "HT", "MCS", "Rate",
+                       "Success", "Retries", "XRetries", "PER");
+
+        for (i = 0; i < rc->rate_table->rate_cnt; i++) {
+                u32 ratekbps = rc->rate_table->info[i].ratekbps;
+                struct ath_rc_stats *stats = &rc->rcstats[i];
+                char mcs[5];
+                char htmode[5];
+                int used_mcs = 0, used_htmode = 0;
+
+                if (WLAN_RC_PHY_HT(rc->rate_table->info[i].phy)) {
+                        used_mcs = snprintf(mcs, 5, "%d",
+                                rc->rate_table->info[i].ratecode);
+
+                        if (WLAN_RC_PHY_40(rc->rate_table->info[i].phy))
+                                used_htmode = snprintf(htmode, 5, "HT40");
+                        else if (WLAN_RC_PHY_20(rc->rate_table->info[i].phy))
+                                used_htmode = snprintf(htmode, 5, "HT20");
+                        else
+                                used_htmode = snprintf(htmode, 5, "????");
                 }
+
+                mcs[used_mcs] = '\0';
+                htmode[used_htmode] = '\0';
+
+                len += snprintf(buf + len, max - len,
+                        "%6s %6s %3u.%d: "
+                        "%10u %10u %10u %10u\n",
+                        htmode,
+                        mcs,
+                        ratekbps / 1000,
+                        (ratekbps % 1000) / 100,
+                        stats->success,
+                        stats->retries,
+                        stats->xretries,
+                        stats->per);
         }
+
+        if (len > max)
+                len = max;
+
+        retval = simple_read_from_buffer(user_buf, count, ppos, buf, len);
+        kfree(buf);
+        return retval;
 }
 
+static const struct file_operations fops_rcstat = {
+        .read = read_file_rcstat,
+        .open = ath9k_debugfs_open,
+        .owner = THIS_MODULE
+};
+
+static void ath_rate_add_sta_debugfs(void *priv, void *priv_sta,
+                                     struct dentry *dir)
+{
+        struct ath_rate_priv *rc = priv_sta;
+        debugfs_create_file("rc_stats", S_IRUGO, dir, rc, &fops_rcstat);
+}
+
+#endif /* CONFIG_ATH9K_DEBUGFS */
+
 static void *ath_rate_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
 {
-        struct ath_wiphy *aphy = hw->priv;
-        return aphy->sc;
+        return hw->priv;
 }
 
 static void ath_rate_free(void *priv)
@@ -1517,13 +1571,11 @@ static void *ath_rate_alloc_sta(void *priv, struct ieee80211_sta *sta, gfp_t gfp
 
         rate_priv = kzalloc(sizeof(struct ath_rate_priv), gfp);
         if (!rate_priv) {
-                ath_print(ath9k_hw_common(sc->sc_ah), ATH_DBG_FATAL,
-                          "Unable to allocate private rc structure\n");
+                ath_err(ath9k_hw_common(sc->sc_ah),
+                        "Unable to allocate private rc structure\n");
                 return NULL;
         }
 
-        rate_priv->tx_triglevel_max = sc->sc_ah->caps.tx_triglevel_max;
-
         return rate_priv;
 }
 
@@ -1545,6 +1597,9 @@ static struct rate_control_ops ath_rate_ops = {
         .free = ath_rate_free,
         .alloc_sta = ath_rate_alloc_sta,
         .free_sta = ath_rate_free_sta,
+#ifdef CONFIG_ATH9K_DEBUGFS
+        .add_sta_debugfs = ath_rate_add_sta_debugfs,
+#endif
 };
 
 int ath_rate_control_register(void)