mac80211: add new Minstrel statistic output via csv

This patch adds a new debugfs file "rc_stats_csv" to output Minstrels
statistics in a common csv format that is easy to parse.

Signed-off-by: Thomas Huehn <thomas@net.t-labs.tu-berlin.de>
Signed-off-by: Stefan Venz <ikstream86@gmail.com>
Acked-by: Felix Fietkau <nbd@openwrt.org>
[remove printing current time of day]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

2 files changed, 82 insertions, 14 deletions

diff --git a/net/mac80211/rc80211_minstrel.h b/net/mac80211/rc80211_minstrel.h
index 410efe620c57..9613e7392c7d 100644
--- a/net/mac80211/rc80211_minstrel.h
+++ b/net/mac80211/rc80211_minstrel.h
@@ -13,7 +13,6 @@
 #define EWMA_DIV        128
 #define SAMPLE_COLUMNS  10      /* number of columns in sample table */
 
-
 /* scaled fraction values */
 #define MINSTREL_SCALE  16
 #define MINSTREL_FRAC(val, div) (((val) << MINSTREL_SCALE) / div)
@@ -24,7 +23,7 @@
 
 /*
  * Perform EWMA (Exponentially Weighted Moving Average) calculation
-  */
+ */
 static inline int
 minstrel_ewma(int old, int new, int weight)
 {
@@ -95,6 +94,7 @@ struct minstrel_sta_info {
 
 #ifdef CONFIG_MAC80211_DEBUGFS
         struct dentry *dbg_stats;
+        struct dentry *dbg_stats_csv;
 #endif
 };
 
@@ -121,7 +121,6 @@ struct minstrel_priv {
         u32 fixed_rate_idx;
         struct dentry *dbg_fixed_rate;
 #endif
-
 };
 
 struct minstrel_debugfs_info {
@@ -135,6 +134,7 @@ void minstrel_remove_sta_debugfs(void *priv, void *priv_sta);
 
 /* debugfs */
 int minstrel_stats_open(struct inode *inode, struct file *file);
+int minstrel_stats_csv_open(struct inode *inode, struct file *file);
 ssize_t minstrel_stats_read(struct file *file, char __user *buf, size_t len, loff_t *ppos);
 int minstrel_stats_release(struct inode *inode, struct file *file);
 
diff --git a/net/mac80211/rc80211_minstrel_debugfs.c b/net/mac80211/rc80211_minstrel_debugfs.c
index 2d70081a77eb..97d118dab5e2 100644
--- a/net/mac80211/rc80211_minstrel_debugfs.c
+++ b/net/mac80211/rc80211_minstrel_debugfs.c
@@ -54,6 +54,22 @@
 #include <net/mac80211.h>
 #include "rc80211_minstrel.h"
 
+ssize_t
+minstrel_stats_read(struct file *file, char __user *buf, size_t len, loff_t *ppos)
+{
+        struct minstrel_debugfs_info *ms;
+
+        ms = file->private_data;
+        return simple_read_from_buffer(buf, len, ppos, ms->buf, ms->len);
+}
+
+int
+minstrel_stats_release(struct inode *inode, struct file *file)
+{
+        kfree(file->private_data);
+        return 0;
+}
+
 int
 minstrel_stats_open(struct inode *inode, struct file *file)
 {
@@ -115,25 +131,72 @@ minstrel_stats_open(struct inode *inode, struct file *file)
         return 0;
 }
 
-ssize_t
-minstrel_stats_read(struct file *file, char __user *buf, size_t len, loff_t *ppos)
+static const struct file_operations minstrel_stat_fops = {
+        .owner = THIS_MODULE,
+        .open = minstrel_stats_open,
+        .read = minstrel_stats_read,
+        .release = minstrel_stats_release,
+        .llseek = default_llseek,
+};
+
+int
+minstrel_stats_csv_open(struct inode *inode, struct file *file)
 {
+        struct minstrel_sta_info *mi = inode->i_private;
         struct minstrel_debugfs_info *ms;
+        unsigned int i, tp, prob, eprob;
+        char *p;
 
-        ms = file->private_data;
-        return simple_read_from_buffer(buf, len, ppos, ms->buf, ms->len);
-}
+        ms = kmalloc(2048, GFP_KERNEL);
+        if (!ms)
+                return -ENOMEM;
+
+        file->private_data = ms;
+        p = ms->buf;
+
+        for (i = 0; i < mi->n_rates; i++) {
+                struct minstrel_rate *mr = &mi->r[i];
+                struct minstrel_rate_stats *mrs = &mi->r[i].stats;
+
+                p += sprintf(p, "%s" ,((i == mi->max_tp_rate[0]) ? "A" : ""));
+                p += sprintf(p, "%s" ,((i == mi->max_tp_rate[1]) ? "B" : ""));
+                p += sprintf(p, "%s" ,((i == mi->max_tp_rate[2]) ? "C" : ""));
+                p += sprintf(p, "%s" ,((i == mi->max_tp_rate[3]) ? "D" : ""));
+                p += sprintf(p, "%s" ,((i == mi->max_prob_rate) ? "P" : ""));
+
+                p += sprintf(p, ",%u%s", mr->bitrate / 2,
+                                (mr->bitrate & 1 ? ".5," : ","));
+                p += sprintf(p, "%u,", i);
+                p += sprintf(p, "%u,",mr->perfect_tx_time);
+
+                tp = MINSTREL_TRUNC(mrs->cur_tp / 10);
+                prob = MINSTREL_TRUNC(mrs->cur_prob * 1000);
+                eprob = MINSTREL_TRUNC(mrs->probability * 1000);
+
+                p += sprintf(p, "%u.%u,%u.%u,%u.%u,%u,%u,%u,"
+                                "%llu,%llu,%d,%d\n",
+                                tp / 10, tp % 10,
+                                eprob / 10, eprob % 10,
+                                prob / 10, prob % 10,
+                                mrs->retry_count,
+                                mrs->last_success,
+                                mrs->last_attempts,
+                                (unsigned long long)mrs->succ_hist,
+                                (unsigned long long)mrs->att_hist,
+                                mi->total_packets - mi->sample_packets,
+                                mi->sample_packets);
+
+        }
+        ms->len = p - ms->buf;
+
+        WARN_ON(ms->len + sizeof(*ms) > 2048);
 
-int
-minstrel_stats_release(struct inode *inode, struct file *file)
-{
-        kfree(file->private_data);
         return 0;
 }
 
-static const struct file_operations minstrel_stat_fops = {
+static const struct file_operations minstrel_stat_csv_fops = {
         .owner = THIS_MODULE,
-        .open = minstrel_stats_open,
+        .open = minstrel_stats_csv_open,
         .read = minstrel_stats_read,
         .release = minstrel_stats_release,
         .llseek = default_llseek,
@@ -146,6 +209,9 @@ minstrel_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir)
 
         mi->dbg_stats = debugfs_create_file("rc_stats", S_IRUGO, dir, mi,
                         &minstrel_stat_fops);
+
+        mi->dbg_stats_csv = debugfs_create_file("rc_stats_csv", S_IRUGO, dir,
+                        mi, &minstrel_stat_csv_fops);
 }
 
 void
@@ -154,4 +220,6 @@ minstrel_remove_sta_debugfs(void *priv, void *priv_sta)
         struct minstrel_sta_info *mi = priv_sta;
 
         debugfs_remove(mi->dbg_stats);
+
+        debugfs_remove(mi->dbg_stats_csv);
 }