[PATCH] iwlwifi: add debugfs rate scale stats

This patch adds rates scale statistics to debugfs:
$ cat /sys/kernel/debug/ieee80211/phy<X>/stations/<mac>/rate_stats_table

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 39 insertions, 1 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-4965-rs.c b/drivers/net/wireless/iwlwifi/iwl-4965-rs.c
index e5f8cce443ba..287c75705c44 100644
--- a/drivers/net/wireless/iwlwifi/iwl-4965-rs.c
+++ b/drivers/net/wireless/iwlwifi/iwl-4965-rs.c
@@ -124,6 +124,7 @@ struct iwl_rate_scale_priv {
         struct iwl_scale_tbl_info lq_info[LQ_SIZE];
 #ifdef CONFIG_MAC80211_DEBUGFS
         struct dentry *rs_sta_dbgfs_scale_table_file;
+        struct dentry *rs_sta_dbgfs_stats_table_file;
         struct iwl_rate dbg_fixed;
         struct iwl_priv *drv;
 #endif
@@ -2068,6 +2069,7 @@ static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
 
         return count;
 }
+
 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
                         char __user *user_buf, size_t count, loff_t *ppos)
 {
@@ -2116,20 +2118,56 @@ static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
         .read = rs_sta_dbgfs_scale_table_read,
         .open = open_file_generic,
 };
+static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
+                        char __user *user_buf, size_t count, loff_t *ppos)
+{
+        char buff[1024];
+        int desc = 0;
+        int i, j;
+
+        struct iwl_rate_scale_priv *rs_priv = file->private_data;
+        for (i = 0; i < LQ_SIZE; i++) {
+                desc += sprintf(buff+desc, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
+                                "rate=0x%X\n",
+                                rs_priv->active_tbl == i?"*":"x",
+                                rs_priv->lq_info[i].lq_type,
+                                rs_priv->lq_info[i].is_SGI,
+                                rs_priv->lq_info[i].is_fat,
+                                rs_priv->lq_info[i].is_dup,
+                                rs_priv->lq_info[i].current_rate.rate_n_flags);
+                for (j = 0; j < IWL_RATE_COUNT; j++) {
+                        desc += sprintf(buff+desc,
+                                        "counter=%d success=%d %%=%d\n",
+                                        rs_priv->lq_info[i].win[j].counter,
+                                        rs_priv->lq_info[i].win[j].success_counter,
+                                        rs_priv->lq_info[i].win[j].success_ratio);
+                }
+        }
+        return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
+}
+
+static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
+        .read = rs_sta_dbgfs_stats_table_read,
+        .open = open_file_generic,
+};
 
 static void rs_add_debugfs(void *priv, void *priv_sta,
                                         struct dentry *dir)
 {
         struct iwl_rate_scale_priv *rs_priv = priv_sta;
         rs_priv->rs_sta_dbgfs_scale_table_file =
-                debugfs_create_file("rate_scale_table", 0444, dir,
+                debugfs_create_file("rate_scale_table", 0600, dir,
                                 rs_priv, &rs_sta_dbgfs_scale_table_ops);
+        rs_priv->rs_sta_dbgfs_stats_table_file =
+                debugfs_create_file("rate_stats_table", 0600, dir,
+                        rs_priv, &rs_sta_dbgfs_stats_table_ops);
 }
 
 static void rs_remove_debugfs(void *priv, void *priv_sta)
 {
         struct iwl_rate_scale_priv *rs_priv = priv_sta;
         debugfs_remove(rs_priv->rs_sta_dbgfs_scale_table_file);
+        debugfs_remove(rs_priv->rs_sta_dbgfs_stats_table_file);
 }
 #endif