ath9k: Add debugfs files for printing TX rate details

Signed-off-by: Sujith <Sujith.Manoharan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

3 files changed, 119 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath9k/core.h b/drivers/net/wireless/ath9k/core.h
index 8683fc8ddb3c..791f1acc0bb3 100644
--- a/drivers/net/wireless/ath9k/core.h
+++ b/drivers/net/wireless/ath9k/core.h
@@ -131,8 +131,18 @@ struct ath_interrupt_stats {
         u32 dtim;
 };
 
+struct ath_legacy_rc_stats {
+        u32 success;
+};
+
+struct ath_11n_rc_stats {
+        u32 success;
+};
+
 struct ath_stats {
         struct ath_interrupt_stats istats;
+        struct ath_legacy_rc_stats legacy_rcstats[12]; /* max(11a,11b,11g) */
+        struct ath_11n_rc_stats n_rcstats[16]; /* 0..15 MCS rates */
 };
 
 struct ath9k_debug {
@@ -141,6 +151,7 @@ struct ath9k_debug {
         struct dentry *debugfs_phy;
         struct dentry *debugfs_dma;
         struct dentry *debugfs_interrupt;
+        struct dentry *debugfs_rcstat;
         struct ath_stats stats;
 };
 
@@ -148,6 +159,7 @@ void DPRINTF(struct ath_softc *sc, int dbg_mask, const char *fmt, ...);
 int ath9k_init_debug(struct ath_softc *sc);
 void ath9k_exit_debug(struct ath_softc *sc);
 void ath_debug_stat_interrupt(struct ath_softc *sc, enum ath9k_int status);
+void ath_debug_stat_rc(struct ath_softc *sc, struct sk_buff *skb);
 
 #else
 
@@ -170,6 +182,11 @@ static inline void ath_debug_stat_interrupt(struct ath_softc *sc,
 {
 }
 
+static inline void ath_debug_stat_rc(struct ath_softc *sc,
+                                     struct sk_buff *skb)
+{
+}
+
 #endif /* CONFIG_ATH9K_DEBUG */
 
 struct ath_config {
diff --git a/drivers/net/wireless/ath9k/debug.c b/drivers/net/wireless/ath9k/debug.c
index 1680164b4adb..6181e49eecba 100644
--- a/drivers/net/wireless/ath9k/debug.c
+++ b/drivers/net/wireless/ath9k/debug.c
@@ -222,6 +222,98 @@ static const struct file_operations fops_interrupt = {
         .owner = THIS_MODULE
 };
 
+static void ath_debug_stat_11n_rc(struct ath_softc *sc, struct sk_buff *skb)
+{
+        struct ath_tx_info_priv *tx_info_priv = NULL;
+        struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
+        struct ieee80211_tx_rate *rates = tx_info->status.rates;
+        int final_ts_idx, idx;
+
+        tx_info_priv = ATH_TX_INFO_PRIV(tx_info);
+        final_ts_idx = tx_info_priv->tx.ts_rateindex;
+        idx = sc->cur_rate_table->info[rates[final_ts_idx].idx].dot11rate;
+
+        sc->sc_debug.stats.n_rcstats[idx].success++;
+}
+
+static void ath_debug_stat_legacy_rc(struct ath_softc *sc, struct sk_buff *skb)
+{
+        struct ath_tx_info_priv *tx_info_priv = NULL;
+        struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
+        struct ieee80211_tx_rate *rates = tx_info->status.rates;
+        int final_ts_idx, idx;
+
+        tx_info_priv = ATH_TX_INFO_PRIV(tx_info);
+        final_ts_idx = tx_info_priv->tx.ts_rateindex;
+        idx = rates[final_ts_idx].idx;
+
+        sc->sc_debug.stats.legacy_rcstats[idx].success++;
+}
+
+void ath_debug_stat_rc(struct ath_softc *sc, struct sk_buff *skb)
+{
+        if (conf_is_ht(&sc->hw->conf))
+                ath_debug_stat_11n_rc(sc, skb);
+        else
+                ath_debug_stat_legacy_rc(sc, skb);
+}
+
+static ssize_t ath_read_file_stat_11n_rc(struct file *file,
+                                         char __user *user_buf,
+                                         size_t count, loff_t *ppos)
+{
+        struct ath_softc *sc = file->private_data;
+        char buf[512];
+        unsigned int len = 0;
+        int i = 0;
+
+        len += sprintf(buf, "%7s %13s\n\n", "Rate", "Success");
+
+        for (i = 0; i <= 15; i++) {
+                len += snprintf(buf + len, sizeof(buf) - len,
+                                "%5s%3d: %8u\n", "MCS", i,
+                                sc->sc_debug.stats.n_rcstats[i].success);
+        }
+
+        return simple_read_from_buffer(user_buf, count, ppos, buf, len);
+}
+
+static ssize_t ath_read_file_stat_legacy_rc(struct file *file,
+                                            char __user *user_buf,
+                                            size_t count, loff_t *ppos)
+{
+        struct ath_softc *sc = file->private_data;
+        char buf[512];
+        unsigned int len = 0;
+        int i = 0;
+
+        len += sprintf(buf, "%7s %13s\n\n", "Rate", "Success");
+
+        for (i = 0; i < sc->cur_rate_table->rate_cnt; i++) {
+                len += snprintf(buf + len, sizeof(buf) - len, "%5u: %12u\n",
+                                sc->cur_rate_table->info[i].ratekbps / 1000,
+                                sc->sc_debug.stats.legacy_rcstats[i].success);
+        }
+
+        return simple_read_from_buffer(user_buf, count, ppos, buf, len);
+}
+
+static ssize_t read_file_rcstat(struct file *file, char __user *user_buf,
+                                size_t count, loff_t *ppos)
+{
+        struct ath_softc *sc = file->private_data;
+
+        if (conf_is_ht(&sc->hw->conf))
+                return ath_read_file_stat_11n_rc(file, user_buf, count, ppos);
+        else
+                return ath_read_file_stat_legacy_rc(file, user_buf, count ,ppos);
+}
+
+static const struct file_operations fops_rcstat = {
+        .read = read_file_rcstat,
+        .open = ath9k_debugfs_open,
+        .owner = THIS_MODULE
+};
 
 int ath9k_init_debug(struct ath_softc *sc)
 {
@@ -248,6 +340,13 @@ int ath9k_init_debug(struct ath_softc *sc)
         if (!sc->sc_debug.debugfs_interrupt)
                 goto err;
 
+        sc->sc_debug.debugfs_rcstat = debugfs_create_file("rcstat",
+                                                  S_IRUGO,
+                                                  sc->sc_debug.debugfs_phy,
+                                                  sc, &fops_rcstat);
+        if (!sc->sc_debug.debugfs_rcstat)
+                goto err;
+
         return 0;
 err:
         ath9k_exit_debug(sc);
@@ -256,6 +355,7 @@ err:
 
 void ath9k_exit_debug(struct ath_softc *sc)
 {
+        debugfs_remove(sc->sc_debug.debugfs_rcstat);
         debugfs_remove(sc->sc_debug.debugfs_interrupt);
         debugfs_remove(sc->sc_debug.debugfs_dma);
         debugfs_remove(sc->sc_debug.debugfs_phy);
diff --git a/drivers/net/wireless/ath9k/rc.c b/drivers/net/wireless/ath9k/rc.c
index a8c4f9757eb1..704b62778142 100644
--- a/drivers/net/wireless/ath9k/rc.c
+++ b/drivers/net/wireless/ath9k/rc.c
@@ -1544,6 +1544,8 @@ static void ath_tx_status(void *priv, struct ieee80211_supported_band *sband,
                                 ieee80211_start_tx_ba_session(sc->hw, hdr->addr1, tid);
                 }
         }
+
+        ath_debug_stat_rc(sc, skb);
 exit:
         kfree(tx_info_priv);
 }