ath9k: Add a debugfs file to dump queue statistics

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

1 files changed, 53 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath9k/debug.c b/drivers/net/wireless/ath/ath9k/debug.c
index f9df82bdd213..086dee841622 100644
--- a/drivers/net/wireless/ath/ath9k/debug.c
+++ b/drivers/net/wireless/ath/ath9k/debug.c
@@ -558,6 +558,50 @@ static ssize_t read_file_xmit(struct file *file, char __user *user_buf,
         return retval;
 }
 
+static ssize_t read_file_queues(struct file *file, char __user *user_buf,
+                                size_t count, loff_t *ppos)
+{
+        struct ath_softc *sc = file->private_data;
+        struct ath_txq *txq;
+        char *buf;
+        unsigned int len = 0, size = 1024;
+        ssize_t retval = 0;
+        int i;
+        char *qname[4] = {"VO", "VI", "BE", "BK"};
+
+        buf = kzalloc(size, GFP_KERNEL);
+        if (buf == NULL)
+                return -ENOMEM;
+
+        for (i = 0; i < IEEE80211_NUM_ACS; i++) {
+                txq = sc->tx.txq_map[i];
+                len += snprintf(buf + len, size - len, "(%s): ", qname[i]);
+
+                ath_txq_lock(sc, txq);
+
+                len += snprintf(buf + len, size - len, "%s: %d ",
+                                "qnum", txq->axq_qnum);
+                len += snprintf(buf + len, size - len, "%s: %2d ",
+                                "qdepth", txq->axq_depth);
+                len += snprintf(buf + len, size - len, "%s: %2d ",
+                                "ampdu-depth", txq->axq_ampdu_depth);
+                len += snprintf(buf + len, size - len, "%s: %3d ",
+                                "pending", txq->pending_frames);
+                len += snprintf(buf + len, size - len, "%s: %d\n",
+                                "stopped", txq->stopped);
+
+                ath_txq_unlock(sc, txq);
+        }
+
+        if (len > size)
+                len = size;
+
+        retval = simple_read_from_buffer(user_buf, count, ppos, buf, len);
+        kfree(buf);
+
+        return retval;
+}
+
 static ssize_t read_file_stations(struct file *file, char __user *user_buf,
                                   size_t count, loff_t *ppos)
 {
@@ -828,6 +872,13 @@ static const struct file_operations fops_xmit = {
         .llseek = default_llseek,
 };
 
+static const struct file_operations fops_queues = {
+        .read = read_file_queues,
+        .open = simple_open,
+        .owner = THIS_MODULE,
+        .llseek = default_llseek,
+};
+
 static const struct file_operations fops_stations = {
         .read = read_file_stations,
         .open = simple_open,
@@ -1553,6 +1604,8 @@ int ath9k_init_debug(struct ath_hw *ah)
                             &fops_interrupt);
         debugfs_create_file("xmit", S_IRUSR, sc->debug.debugfs_phy, sc,
                             &fops_xmit);
+        debugfs_create_file("queues", S_IRUSR, sc->debug.debugfs_phy, sc,
+                            &fops_queues);
         debugfs_create_u32("qlen_bk", S_IRUSR | S_IWUSR, sc->debug.debugfs_phy,
                            &sc->tx.txq_max_pending[IEEE80211_AC_BK]);
         debugfs_create_u32("qlen_be", S_IRUSR | S_IWUSR, sc->debug.debugfs_phy,