ath9k: Add debug counters for TX

Location: ath9k/phy#/xmit

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

4 files changed, 160 insertions, 14 deletions

diff --git a/drivers/net/wireless/ath/ath9k/ath9k.h b/drivers/net/wireless/ath/ath9k/ath9k.h
index 3a978bfa246e..bda0f302340c 100644
--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
@@ -237,7 +237,6 @@ struct ath_txq {
         spinlock_t axq_lock;
         u32 axq_depth;
         u8 axq_aggr_depth;
-        u32 axq_totalqueued;
         bool stopped;
         bool axq_tx_inprogress;
         struct ath_buf *axq_linkbuf;
diff --git a/drivers/net/wireless/ath/ath9k/debug.c b/drivers/net/wireless/ath/ath9k/debug.c
index 9f99f00c1447..9e369208f7dc 100644
--- a/drivers/net/wireless/ath/ath9k/debug.c
+++ b/drivers/net/wireless/ath/ath9k/debug.c
@@ -486,6 +486,83 @@ static const struct file_operations fops_wiphy = {
         .owner = THIS_MODULE
 };
 
+#define PR(str, elem)                                                   \
+        do {                                                            \
+                len += snprintf(buf + len, size - len,                  \
+                                "%s%13u%11u%10u%10u\n", str,            \
+                sc->debug.stats.txstats[sc->tx.hwq_map[ATH9K_WME_AC_BE]].elem, \
+                sc->debug.stats.txstats[sc->tx.hwq_map[ATH9K_WME_AC_BK]].elem, \
+                sc->debug.stats.txstats[sc->tx.hwq_map[ATH9K_WME_AC_VI]].elem, \
+                sc->debug.stats.txstats[sc->tx.hwq_map[ATH9K_WME_AC_VO]].elem); \
+} while(0)
+
+static ssize_t read_file_xmit(struct file *file, char __user *user_buf,
+                              size_t count, loff_t *ppos)
+{
+        struct ath_softc *sc = file->private_data;
+        char *buf;
+        unsigned int len = 0, size = 2048;
+        ssize_t retval = 0;
+
+        buf = kzalloc(size, GFP_KERNEL);
+        if (buf == NULL)
+                return 0;
+
+        len += sprintf(buf, "%30s %10s%10s%10s\n\n", "BE", "BK", "VI", "VO");
+
+        PR("MPDUs Queued:    ", queued);
+        PR("MPDUs Completed: ", completed);
+        PR("Aggregates:      ", a_aggr);
+        PR("AMPDUs Queued:   ", a_queued);
+        PR("AMPDUs Completed:", a_completed);
+        PR("AMPDUs Retried:  ", a_retries);
+        PR("AMPDUs XRetried: ", a_xretries);
+        PR("FIFO Underrun:   ", fifo_underrun);
+        PR("TXOP Exceeded:   ", xtxop);
+        PR("TXTIMER Expiry:  ", timer_exp);
+        PR("DESC CFG Error:  ", desc_cfg_err);
+        PR("DATA Underrun:   ", data_underrun);
+        PR("DELIM Underrun:  ", delim_underrun);
+
+        retval = simple_read_from_buffer(user_buf, count, ppos, buf, len);
+        kfree(buf);
+
+        return retval;
+}
+
+void ath_debug_stat_tx(struct ath_softc *sc, struct ath_txq *txq,
+                       struct ath_buf *bf)
+{
+        struct ath_desc *ds = bf->bf_desc;
+
+        if (bf_isampdu(bf)) {
+                if (bf_isxretried(bf))
+                        TX_STAT_INC(txq->axq_qnum, a_xretries);
+                else
+                        TX_STAT_INC(txq->axq_qnum, a_completed);
+        } else {
+                TX_STAT_INC(txq->axq_qnum, completed);
+        }
+
+        if (ds->ds_txstat.ts_status & ATH9K_TXERR_FIFO)
+                TX_STAT_INC(txq->axq_qnum, fifo_underrun);
+        if (ds->ds_txstat.ts_status & ATH9K_TXERR_XTXOP)
+                TX_STAT_INC(txq->axq_qnum, xtxop);
+        if (ds->ds_txstat.ts_status & ATH9K_TXERR_TIMER_EXPIRED)
+                TX_STAT_INC(txq->axq_qnum, timer_exp);
+        if (ds->ds_txstat.ts_flags & ATH9K_TX_DESC_CFG_ERR)
+                TX_STAT_INC(txq->axq_qnum, desc_cfg_err);
+        if (ds->ds_txstat.ts_flags & ATH9K_TX_DATA_UNDERRUN)
+                TX_STAT_INC(txq->axq_qnum, data_underrun);
+        if (ds->ds_txstat.ts_flags & ATH9K_TX_DELIM_UNDERRUN)
+                TX_STAT_INC(txq->axq_qnum, delim_underrun);
+}
+
+static const struct file_operations fops_xmit = {
+        .read = read_file_xmit,
+        .open = ath9k_debugfs_open,
+        .owner = THIS_MODULE
+};
 
 int ath9k_init_debug(struct ath_softc *sc)
 {
@@ -529,6 +606,13 @@ int ath9k_init_debug(struct ath_softc *sc)
         if (!sc->debug.debugfs_wiphy)
                 goto err;
 
+        sc->debug.debugfs_xmit = debugfs_create_file("xmit",
+                                                     S_IRUSR,
+                                                     sc->debug.debugfs_phy,
+                                                     sc, &fops_xmit);
+        if (!sc->debug.debugfs_xmit)
+                goto err;
+
         return 0;
 err:
         ath9k_exit_debug(sc);
@@ -537,6 +621,7 @@ err:
 
 void ath9k_exit_debug(struct ath_softc *sc)
 {
+        debugfs_remove(sc->debug.debugfs_xmit);
         debugfs_remove(sc->debug.debugfs_wiphy);
         debugfs_remove(sc->debug.debugfs_rcstat);
         debugfs_remove(sc->debug.debugfs_interrupt);
diff --git a/drivers/net/wireless/ath/ath9k/debug.h b/drivers/net/wireless/ath/ath9k/debug.h
index edda15bf2c15..5e56b79d0cb0 100644
--- a/drivers/net/wireless/ath/ath9k/debug.h
+++ b/drivers/net/wireless/ath/ath9k/debug.h
@@ -35,6 +35,15 @@ enum ATH_DEBUG {
 
 #define DBG_DEFAULT (ATH_DBG_FATAL)
 
+struct ath_txq;
+struct ath_buf;
+
+#ifdef CONFIG_ATH9K_DEBUG
+#define TX_STAT_INC(q, c) sc->debug.stats.txstats[q].c++
+#else
+#define TX_STAT_INC(q, c) do { } while (0)
+#endif
+
 #ifdef CONFIG_ATH9K_DEBUG
 
 /**
@@ -87,9 +96,45 @@ struct ath_rc_stats {
         u8 per;
 };
 
+/**
+ * struct ath_tx_stats - Statistics about TX
+ * @queued: Total MPDUs (non-aggr) queued
+ * @completed: Total MPDUs (non-aggr) completed
+ * @a_aggr: Total no. of aggregates queued
+ * @a_queued: Total AMPDUs queued
+ * @a_completed: Total AMPDUs completed
+ * @a_retries: No. of AMPDUs retried (SW)
+ * @a_xretries: No. of AMPDUs dropped due to xretries
+ * @fifo_underrun: FIFO underrun occurrences
+        Valid only for:
+                - non-aggregate condition.
+                - first packet of aggregate.
+ * @xtxop: No. of frames filtered because of TXOP limit
+ * @timer_exp: Transmit timer expiry
+ * @desc_cfg_err: Descriptor configuration errors
+ * @data_urn: TX data underrun errors
+ * @delim_urn: TX delimiter underrun errors
+ */
+struct ath_tx_stats {
+        u32 queued;
+        u32 completed;
+        u32 a_aggr;
+        u32 a_queued;
+        u32 a_completed;
+        u32 a_retries;
+        u32 a_xretries;
+        u32 fifo_underrun;
+        u32 xtxop;
+        u32 timer_exp;
+        u32 desc_cfg_err;
+        u32 data_underrun;
+        u32 delim_underrun;
+};
+
 struct ath_stats {
         struct ath_interrupt_stats istats;
         struct ath_rc_stats rcstats[RATE_TABLE_SIZE];
+        struct ath_tx_stats txstats[ATH9K_NUM_TX_QUEUES];
 };
 
 struct ath9k_debug {
@@ -100,6 +145,7 @@ struct ath9k_debug {
         struct dentry *debugfs_interrupt;
         struct dentry *debugfs_rcstat;
         struct dentry *debugfs_wiphy;
+        struct dentry *debugfs_xmit;
         struct ath_stats stats;
 };
 
@@ -110,6 +156,8 @@ int ath9k_debug_create_root(void);
 void ath9k_debug_remove_root(void);
 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);
+void ath_debug_stat_tx(struct ath_softc *sc, struct ath_txq *txq,
+                       struct ath_buf *bf);
 void ath_debug_stat_retries(struct ath_softc *sc, int rix,
                             int xretries, int retries, u8 per);
 
@@ -148,6 +196,12 @@ static inline void ath_debug_stat_rc(struct ath_softc *sc,
 {
 }
 
+static inline void ath_debug_stat_tx(struct ath_softc *sc,
+                                     struct ath_txq *txq,
+                                     struct ath_buf *bf)
+{
+}
+
 static inline void ath_debug_stat_retries(struct ath_softc *sc, int rix,
                                           int xretries, int retries, u8 per)
 {
diff --git a/drivers/net/wireless/ath/ath9k/xmit.c b/drivers/net/wireless/ath/ath9k/xmit.c
index 6eb2927c8aec..b7806e2ca0e1 100644
--- a/drivers/net/wireless/ath/ath9k/xmit.c
+++ b/drivers/net/wireless/ath/ath9k/xmit.c
@@ -59,6 +59,7 @@ static void ath_tx_send_ht_normal(struct ath_softc *sc, struct ath_txq *txq,
                                   struct ath_atx_tid *tid,
                                   struct list_head *bf_head);
 static void ath_tx_complete_buf(struct ath_softc *sc, struct ath_buf *bf,
+                                struct ath_txq *txq,
                                 struct list_head *bf_q,
                                 int txok, int sendbar);
 static void ath_tx_txqaddbuf(struct ath_softc *sc, struct ath_txq *txq,
@@ -212,7 +213,7 @@ static void ath_tid_drain(struct ath_softc *sc, struct ath_txq *txq,
                         ath_tx_update_baw(sc, tid, bf->bf_seqno);
 
                 spin_unlock(&txq->axq_lock);
-                ath_tx_complete_buf(sc, bf, &bf_head, 0, 0);
+                ath_tx_complete_buf(sc, bf, txq, &bf_head, 0, 0);
                 spin_lock(&txq->axq_lock);
         }
 
@@ -220,13 +221,15 @@ static void ath_tid_drain(struct ath_softc *sc, struct ath_txq *txq,
         tid->baw_tail = tid->baw_head;
 }
 
-static void ath_tx_set_retry(struct ath_softc *sc, struct ath_buf *bf)
+static void ath_tx_set_retry(struct ath_softc *sc, struct ath_txq *txq,
+                             struct ath_buf *bf)
 {
         struct sk_buff *skb;
         struct ieee80211_hdr *hdr;
 
         bf->bf_state.bf_type |= BUF_RETRY;
         bf->bf_retries++;
+        TX_STAT_INC(txq->axq_qnum, a_retries);
 
         skb = bf->bf_mpdu;
         hdr = (struct ieee80211_hdr *)skb->data;
@@ -328,7 +331,7 @@ static void ath_tx_complete_aggr(struct ath_softc *sc, struct ath_txq *txq,
                         if (!(tid->state & AGGR_CLEANUP) &&
                             ds->ds_txstat.ts_flags != ATH9K_TX_SW_ABORTED) {
                                 if (bf->bf_retries < ATH_MAX_SW_RETRIES) {
-                                        ath_tx_set_retry(sc, bf);
+                                        ath_tx_set_retry(sc, txq, bf);
                                         txpending = 1;
                                 } else {
                                         bf->bf_state.bf_type |= BUF_XRETRY;
@@ -375,7 +378,7 @@ static void ath_tx_complete_aggr(struct ath_softc *sc, struct ath_txq *txq,
                                 ath_tx_rc_status(bf, ds, nbad, txok, false);
                         }
 
-                        ath_tx_complete_buf(sc, bf, &bf_head, !txfail, sendbar);
+                        ath_tx_complete_buf(sc, bf, txq, &bf_head, !txfail, sendbar);
                 } else {
                         /* retry the un-acked ones */
                         if (bf->bf_next == NULL && bf_last->bf_stale) {
@@ -395,8 +398,8 @@ static void ath_tx_complete_aggr(struct ath_softc *sc, struct ath_txq *txq,
                                         bf->bf_state.bf_type |= BUF_XRETRY;
                                         ath_tx_rc_status(bf, ds, nbad,
                                                          0, false);
-                                        ath_tx_complete_buf(sc, bf, &bf_head,
-                                                            0, 0);
+                                        ath_tx_complete_buf(sc, bf, txq,
+                                                            &bf_head, 0, 0);
                                         break;
                                 }
 
@@ -569,6 +572,7 @@ static int ath_compute_num_delims(struct ath_softc *sc, struct ath_atx_tid *tid,
 }
 
 static enum ATH_AGGR_STATUS ath_tx_form_aggr(struct ath_softc *sc,
+                                             struct ath_txq *txq,
                                              struct ath_atx_tid *tid,
                                              struct list_head *bf_q)
 {
@@ -633,6 +637,7 @@ static enum ATH_AGGR_STATUS ath_tx_form_aggr(struct ath_softc *sc,
                         bf_prev->bf_desc->ds_link = bf->bf_daddr;
                 }
                 bf_prev = bf;
+
         } while (!list_empty(&tid->buf_q));
 
         bf_first->bf_al = al;
@@ -655,7 +660,7 @@ static void ath_tx_sched_aggr(struct ath_softc *sc, struct ath_txq *txq,
 
                 INIT_LIST_HEAD(&bf_q);
 
-                status = ath_tx_form_aggr(sc, tid, &bf_q);
+                status = ath_tx_form_aggr(sc, txq, tid, &bf_q);
 
                 /*
                  * no frames picked up to be aggregated;
@@ -686,6 +691,7 @@ static void ath_tx_sched_aggr(struct ath_softc *sc, struct ath_txq *txq,
 
                 txq->axq_aggr_depth++;
                 ath_tx_txqaddbuf(sc, txq, &bf_q);
+                TX_STAT_INC(txq->axq_qnum, a_aggr);
 
         } while (txq->axq_depth < ATH_AGGR_MIN_QDEPTH &&
                  status != ATH_AGGR_BAW_CLOSED);
@@ -737,7 +743,7 @@ void ath_tx_aggr_stop(struct ath_softc *sc, struct ieee80211_sta *sta, u16 tid)
                 }
                 list_move_tail(&bf->list, &bf_head);
                 ath_tx_update_baw(sc, txtid, bf->bf_seqno);
-                ath_tx_complete_buf(sc, bf, &bf_head, 0, 0);
+                ath_tx_complete_buf(sc, bf, txq, &bf_head, 0, 0);
         }
         spin_unlock_bh(&txq->axq_lock);
 
@@ -859,7 +865,6 @@ struct ath_txq *ath_txq_setup(struct ath_softc *sc, int qtype, int subtype)
                 spin_lock_init(&txq->axq_lock);
                 txq->axq_depth = 0;
                 txq->axq_aggr_depth = 0;
-                txq->axq_totalqueued = 0;
                 txq->axq_linkbuf = NULL;
                 txq->axq_tx_inprogress = false;
                 sc->tx.txqsetup |= 1<<qnum;
@@ -1025,7 +1030,7 @@ void ath_draintxq(struct ath_softc *sc, struct ath_txq *txq, bool retry_tx)
                 if (bf_isampdu(bf))
                         ath_tx_complete_aggr(sc, txq, bf, &bf_head, 0);
                 else
-                        ath_tx_complete_buf(sc, bf, &bf_head, 0, 0);
+                        ath_tx_complete_buf(sc, bf, txq, &bf_head, 0, 0);
         }
 
         spin_lock_bh(&txq->axq_lock);
@@ -1176,7 +1181,6 @@ static void ath_tx_txqaddbuf(struct ath_softc *sc, struct ath_txq *txq,
 
         list_splice_tail_init(head, &txq->axq_q);
         txq->axq_depth++;
-        txq->axq_totalqueued++;
         txq->axq_linkbuf = list_entry(txq->axq_q.prev, struct ath_buf, list);
 
         DPRINTF(sc, ATH_DBG_QUEUE,
@@ -1224,6 +1228,7 @@ static void ath_tx_send_ampdu(struct ath_softc *sc, struct ath_atx_tid *tid,
 
         bf = list_first_entry(bf_head, struct ath_buf, list);
         bf->bf_state.bf_type |= BUF_AMPDU;
+        TX_STAT_INC(txctl->txq->axq_qnum, a_queued);
 
         /*
          * Do not queue to h/w when any of the following conditions is true:
@@ -1270,6 +1275,7 @@ static void ath_tx_send_ht_normal(struct ath_softc *sc, struct ath_txq *txq,
         bf->bf_lastbf = bf;
         ath_buf_set_rate(sc, bf);
         ath_tx_txqaddbuf(sc, txq, bf_head);
+        TX_STAT_INC(txq->axq_qnum, queued);
 }
 
 static void ath_tx_send_normal(struct ath_softc *sc, struct ath_txq *txq,
@@ -1283,6 +1289,7 @@ static void ath_tx_send_normal(struct ath_softc *sc, struct ath_txq *txq,
         bf->bf_nframes = 1;
         ath_buf_set_rate(sc, bf);
         ath_tx_txqaddbuf(sc, txq, bf_head);
+        TX_STAT_INC(txq->axq_qnum, queued);
 }
 
 static enum ath9k_pkt_type get_hw_packet_type(struct sk_buff *skb)
@@ -1808,6 +1815,7 @@ static void ath_tx_complete(struct ath_softc *sc, struct sk_buff *skb,
 }
 
 static void ath_tx_complete_buf(struct ath_softc *sc, struct ath_buf *bf,
+                                struct ath_txq *txq,
                                 struct list_head *bf_q,
                                 int txok, int sendbar)
 {
@@ -1815,7 +1823,6 @@ static void ath_tx_complete_buf(struct ath_softc *sc, struct ath_buf *bf,
         unsigned long flags;
         int tx_flags = 0;
 
-
         if (sendbar)
                 tx_flags = ATH_TX_BAR;
 
@@ -1828,6 +1835,7 @@ static void ath_tx_complete_buf(struct ath_softc *sc, struct ath_buf *bf,
 
         dma_unmap_single(sc->dev, bf->bf_dmacontext, skb->len, DMA_TO_DEVICE);
         ath_tx_complete(sc, skb, tx_flags);
+        ath_debug_stat_tx(sc, txq, bf);
 
         /*
          * Return the list of ath_buf of this mpdu to free queue
@@ -2015,7 +2023,7 @@ static void ath_tx_processq(struct ath_softc *sc, struct ath_txq *txq)
                 if (bf_isampdu(bf))
                         ath_tx_complete_aggr(sc, txq, bf, &bf_head, txok);
                 else
-                        ath_tx_complete_buf(sc, bf, &bf_head, txok, 0);
+                        ath_tx_complete_buf(sc, bf, txq, &bf_head, txok, 0);
 
                 ath_wake_mac80211_queue(sc, txq);