ath9k: Keep track of stations for debugfs.

The stations hold the ath_node, which holds the tid
and other xmit logic structures.  In order to debug
stuck xmit logic, we need a way to print out the tid
state for the stations.

Signed-off-by: Ben Greear <greearb@candelatech.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 92 insertions, 2 deletions

diff --git a/drivers/net/wireless/ath/ath9k/debug.c b/drivers/net/wireless/ath/ath9k/debug.c
index faf84e499c8f..650f00f59d79 100644
--- a/drivers/net/wireless/ath/ath9k/debug.c
+++ b/drivers/net/wireless/ath/ath9k/debug.c
@@ -587,6 +587,8 @@ static const struct file_operations fops_wiphy = {
                 sc->debug.stats.txstats[WME_AC_BK].elem, \
                 sc->debug.stats.txstats[WME_AC_VI].elem, \
                 sc->debug.stats.txstats[WME_AC_VO].elem); \
+                if (len >= size)                          \
+                        goto done;                        \
 } while(0)
 
 #define PRX(str, elem)                                                  \
@@ -597,6 +599,8 @@ do {									\
                         (unsigned int)(sc->tx.txq[WME_AC_BK].elem),     \
                         (unsigned int)(sc->tx.txq[WME_AC_VI].elem),     \
                         (unsigned int)(sc->tx.txq[WME_AC_VO].elem));    \
+        if (len >= size)                                                \
+                goto done;                                              \
 } while(0)
 
 #define PRQLE(str, elem)                                                \
@@ -607,6 +611,8 @@ do {									\
                         list_empty(&sc->tx.txq[WME_AC_BK].elem),        \
                         list_empty(&sc->tx.txq[WME_AC_VI].elem),        \
                         list_empty(&sc->tx.txq[WME_AC_VO].elem));       \
+        if (len >= size)                                                \
+                goto done;                                              \
 } while (0)
 
 static ssize_t read_file_xmit(struct file *file, char __user *user_buf,
@@ -614,7 +620,7 @@ static ssize_t read_file_xmit(struct file *file, char __user *user_buf,
 {
         struct ath_softc *sc = file->private_data;
         char *buf;
-        unsigned int len = 0, size = 4000;
+        unsigned int len = 0, size = 8000;
         int i;
         ssize_t retval = 0;
         char tmp[32];
@@ -623,7 +629,10 @@ static ssize_t read_file_xmit(struct file *file, char __user *user_buf,
         if (buf == NULL)
                 return -ENOMEM;
 
-        len += sprintf(buf, "%30s %10s%10s%10s\n\n", "BE", "BK", "VI", "VO");
+        len += sprintf(buf, "Num-Tx-Queues: %i  tx-queues-setup: 0x%x\n"
+                       "%30s %10s%10s%10s\n\n",
+                       ATH9K_NUM_TX_QUEUES, sc->tx.txqsetup,
+                       "BE", "BK", "VI", "VO");
 
         PR("MPDUs Queued:    ", queued);
         PR("MPDUs Completed: ", completed);
@@ -644,6 +653,14 @@ static ssize_t read_file_xmit(struct file *file, char __user *user_buf,
         PR("hw-put-tx-buf:   ", puttxbuf);
         PR("hw-tx-start:     ", txstart);
         PR("hw-tx-proc-desc: ", txprocdesc);
+        len += snprintf(buf + len, size - len,
+                        "%s%11p%11p%10p%10p\n", "txq-memory-address:",
+                        &(sc->tx.txq[WME_AC_BE]),
+                        &(sc->tx.txq[WME_AC_BK]),
+                        &(sc->tx.txq[WME_AC_VI]),
+                        &(sc->tx.txq[WME_AC_VO]));
+        if (len >= size)
+                goto done;
 
         PRX("axq-qnum:        ", axq_qnum);
         PRX("axq-depth:       ", axq_depth);
@@ -661,6 +678,68 @@ static ssize_t read_file_xmit(struct file *file, char __user *user_buf,
                 snprintf(tmp, sizeof(tmp) - 1, "txq_fifo[%i] empty: ", i);
                 PRQLE(tmp, txq_fifo[i]);
         }
+
+done:
+        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)
+{
+        struct ath_softc *sc = file->private_data;
+        char *buf;
+        unsigned int len = 0, size = 64000;
+        struct ath_node *an = NULL;
+        ssize_t retval = 0;
+        int q;
+
+        buf = kzalloc(size, GFP_KERNEL);
+        if (buf == NULL)
+                return -ENOMEM;
+
+        len += snprintf(buf + len, size - len,
+                        "Stations:\n"
+                        " tid: addr sched paused buf_q-empty an ac\n"
+                        " ac: addr sched tid_q-empty txq\n");
+
+        spin_lock(&sc->nodes_lock);
+        list_for_each_entry(an, &sc->nodes, list) {
+                len += snprintf(buf + len, size - len,
+                                "%pM\n", an->sta->addr);
+                if (len >= size)
+                        goto done;
+
+                for (q = 0; q < WME_NUM_TID; q++) {
+                        struct ath_atx_tid *tid = &(an->tid[q]);
+                        len += snprintf(buf + len, size - len,
+                                        " tid: %p %s %s %i %p %p\n",
+                                        tid, tid->sched ? "sched" : "idle",
+                                        tid->paused ? "paused" : "running",
+                                        list_empty(&tid->buf_q),
+                                        tid->an, tid->ac);
+                        if (len >= size)
+                                goto done;
+                }
+
+                for (q = 0; q < WME_NUM_AC; q++) {
+                        struct ath_atx_ac *ac = &(an->ac[q]);
+                        len += snprintf(buf + len, size - len,
+                                        " ac: %p %s %i %p\n",
+                                        ac, ac->sched ? "sched" : "idle",
+                                        list_empty(&ac->tid_q), ac->txq);
+                        if (len >= size)
+                                goto done;
+                }
+        }
+
+done:
+        spin_unlock(&sc->nodes_lock);
         if (len > size)
                 len = size;
 
@@ -708,6 +787,13 @@ static const struct file_operations fops_xmit = {
         .llseek = default_llseek,
 };
 
+static const struct file_operations fops_stations = {
+        .read = read_file_stations,
+        .open = ath9k_debugfs_open,
+        .owner = THIS_MODULE,
+        .llseek = default_llseek,
+};
+
 static ssize_t read_file_recv(struct file *file, char __user *user_buf,
                               size_t count, loff_t *ppos)
 {
@@ -945,6 +1031,10 @@ int ath9k_init_debug(struct ath_hw *ah)
                         sc, &fops_xmit))
                 goto err;
 
+        if (!debugfs_create_file("stations", S_IRUSR, sc->debug.debugfs_phy,
+                        sc, &fops_stations))
+                goto err;
+
         if (!debugfs_create_file("recv", S_IRUSR, sc->debug.debugfs_phy,
                         sc, &fops_recv))
                 goto err;