mac80211: Show pending txqlen in debugfs.

Could be useful for debugging memory consumption issues,
and perhaps power-save as well.

Signed-off-by: Ben Greear <greearb@candelatech.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/net/mac80211/debugfs.c b/net/mac80211/debugfs.c
index e02ba42..f62cd0e 100644 (file)
--- a/net/mac80211/debugfs.c
+++ b/net/mac80211/debugfs.c
@@ -243,6 +243,31 @@ static ssize_t hwflags_read(struct file *file, char __user *user_buf,
        return rv;
 }
 
+static ssize_t misc_read(struct file *file, char __user *user_buf,
+                        size_t count, loff_t *ppos)
+{
+       struct ieee80211_local *local = file->private_data;
+       /* Max len of each line is 16 characters, plus 9 for 'pending:\n' */
+       size_t bufsz = IEEE80211_MAX_QUEUES * 16 + 9;
+       char *buf = kzalloc(bufsz, GFP_KERNEL);
+       char *pos = buf, *end = buf + bufsz - 1;
+       ssize_t rv;
+       int i;
+       int ln;
+
+       pos += scnprintf(pos, end - pos, "pending:\n");
+
+       for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
+               ln = skb_queue_len(&local->pending[i]);
+               pos += scnprintf(pos, end - pos, "[%i] %d\n",
+                                i, ln);
+       }
+
+       rv = simple_read_from_buffer(user_buf, count, ppos, buf, strlen(buf));
+       kfree(buf);
+       return rv;
+}
+
 static ssize_t queues_read(struct file *file, char __user *user_buf,
                           size_t count, loff_t *ppos)
 {
@@ -263,6 +288,7 @@ static ssize_t queues_read(struct file *file, char __user *user_buf,
 
 DEBUGFS_READONLY_FILE_OPS(hwflags);
 DEBUGFS_READONLY_FILE_OPS(queues);
+DEBUGFS_READONLY_FILE_OPS(misc);
 
 /* statistics stuff */
 
@@ -331,6 +357,7 @@ void debugfs_hw_add(struct ieee80211_local *local)
        DEBUGFS_ADD(total_ps_buffered);
        DEBUGFS_ADD(wep_iv);
        DEBUGFS_ADD(queues);
+       DEBUGFS_ADD(misc);
 #ifdef CONFIG_PM
        DEBUGFS_ADD_MODE(reset, 0200);
 #endif