mac80211: add new Minstrel-HT statistic output via csv

This patch adds a new debugfs file "rc_stats_csv" to output
Minstrel-HTs 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, 138 insertions, 2 deletions

diff --git a/net/mac80211/rc80211_minstrel_ht.h b/net/mac80211/rc80211_minstrel_ht.h
index f2217d6aa0c2..3cc30e8f0613 100644
--- a/net/mac80211/rc80211_minstrel_ht.h
+++ b/net/mac80211/rc80211_minstrel_ht.h
@@ -112,6 +112,7 @@ struct minstrel_ht_sta_priv {
         };
 #ifdef CONFIG_MAC80211_DEBUGFS
         struct dentry *dbg_stats;
+        struct dentry *dbg_stats_csv;
 #endif
         void *ratelist;
         void *sample_table;
diff --git a/net/mac80211/rc80211_minstrel_ht_debugfs.c b/net/mac80211/rc80211_minstrel_ht_debugfs.c
index 7fc690ffd85a..95731e639d4e 100644
--- a/net/mac80211/rc80211_minstrel_ht_debugfs.c
+++ b/net/mac80211/rc80211_minstrel_ht_debugfs.c
@@ -107,8 +107,8 @@ minstrel_ht_stats_open(struct inode *inode, struct file *file)
         struct minstrel_ht_sta *mi = &msp->ht;
         struct minstrel_debugfs_info *ms;
         unsigned int i;
-        char *p;
         int ret;
+        char *p;
 
         if (!msp->is_ht) {
                 inode->i_private = &msp->legacy;
@@ -146,7 +146,6 @@ minstrel_ht_stats_open(struct inode *inode, struct file *file)
                 MINSTREL_TRUNC(mi->avg_ampdu_len),
                 MINSTREL_TRUNC(mi->avg_ampdu_len * 10) % 10);
         ms->len = p - ms->buf;
-
         WARN_ON(ms->len + sizeof(*ms) > 32768);
 
         return nonseekable_open(inode, file);
@@ -160,6 +159,139 @@ static const struct file_operations minstrel_ht_stat_fops = {
         .llseek = no_llseek,
 };
 
+static char *
+minstrel_ht_stats_csv_dump(struct minstrel_ht_sta *mi, int i, char *p)
+{
+        const struct mcs_group *mg;
+        unsigned int j, tp, prob, eprob, tx_time;
+        char htmode = '2';
+        char gimode = 'L';
+        u32 gflags;
+
+        if (!mi->groups[i].supported)
+                return p;
+
+        mg = &minstrel_mcs_groups[i];
+        gflags = mg->flags;
+
+        if (gflags & IEEE80211_TX_RC_40_MHZ_WIDTH)
+                htmode = '4';
+        else if (gflags & IEEE80211_TX_RC_80_MHZ_WIDTH)
+                htmode = '8';
+        if (gflags & IEEE80211_TX_RC_SHORT_GI)
+                gimode = 'S';
+
+        for (j = 0; j < MCS_GROUP_RATES; j++) {
+                struct minstrel_rate_stats *mr = &mi->groups[i].rates[j];
+                static const int bitrates[4] = { 10, 20, 55, 110 };
+                int idx = i * MCS_GROUP_RATES + j;
+
+                if (!(mi->groups[i].supported & BIT(j)))
+                        continue;
+
+                if (gflags & IEEE80211_TX_RC_MCS) {
+                        p += sprintf(p, "HT%c0,", htmode);
+                        p += sprintf(p, "%cGI,", gimode);
+                        p += sprintf(p, "%d,", mg->streams);
+                } else if (gflags & IEEE80211_TX_RC_VHT_MCS) {
+                        p += sprintf(p, "VHT%c0,", htmode);
+                        p += sprintf(p, "%cGI,", gimode);
+                        p += sprintf(p, "%d,", mg->streams);
+                } else {
+                        p += sprintf(p, "CCK,");
+                        p += sprintf(p, "%cP,", j < 4 ? 'L' : 'S');
+                        p += sprintf(p, "1,");
+                }
+
+                p += sprintf(p, "%s" ,((idx == mi->max_tp_rate[0]) ? "A" : ""));
+                p += sprintf(p, "%s" ,((idx == mi->max_tp_rate[1]) ? "B" : ""));
+                p += sprintf(p, "%s" ,((idx == mi->max_tp_rate[2]) ? "C" : ""));
+                p += sprintf(p, "%s" ,((idx == mi->max_tp_rate[3]) ? "D" : ""));
+                p += sprintf(p, "%s" ,((idx == mi->max_prob_rate) ? "P" : ""));
+
+                if (gflags & IEEE80211_TX_RC_MCS) {
+                        p += sprintf(p, ",MCS%-2u,", (mg->streams - 1) * 8 + j);
+                } else if (gflags & IEEE80211_TX_RC_VHT_MCS) {
+                        p += sprintf(p, ",MCS%-1u/%1u,", j, mg->streams);
+                } else {
+                        int r = bitrates[j % 4];
+                        p += sprintf(p, ",%2u.%1uM,", r / 10, r % 10);
+                }
+
+                p += sprintf(p, "%u,", idx);
+                tx_time = DIV_ROUND_CLOSEST(mg->duration[j], 1000);
+                p += sprintf(p, "%u,", tx_time);
+
+                tp = mr->cur_tp / 10;
+                prob = MINSTREL_TRUNC(mr->cur_prob * 1000);
+                eprob = MINSTREL_TRUNC(mr->probability * 1000);
+
+                p += sprintf(p, "%u.%u,%u.%u,%u.%u,%u,%u,%u,%llu,%llu,",
+                                tp / 10, tp % 10,
+                                eprob / 10, eprob % 10,
+                                prob / 10, prob % 10,
+                                mr->retry_count,
+                                mr->last_success,
+                                mr->last_attempts,
+                                (unsigned long long)mr->succ_hist,
+                                (unsigned long long)mr->att_hist);
+                p += sprintf(p, "%d,%d,%d.%d\n",
+                                max(0, (int) mi->total_packets -
+                                (int) mi->sample_packets),
+                                mi->sample_packets,
+                                MINSTREL_TRUNC(mi->avg_ampdu_len),
+                                MINSTREL_TRUNC(mi->avg_ampdu_len * 10) % 10);
+        }
+
+        return p;
+}
+
+static int
+minstrel_ht_stats_csv_open(struct inode *inode, struct file *file)
+{
+        struct minstrel_ht_sta_priv *msp = inode->i_private;
+        struct minstrel_ht_sta *mi = &msp->ht;
+        struct minstrel_debugfs_info *ms;
+        unsigned int i;
+        int ret;
+        char *p;
+
+        if (!msp->is_ht) {
+                inode->i_private = &msp->legacy;
+                ret = minstrel_stats_csv_open(inode, file);
+                inode->i_private = msp;
+                return ret;
+        }
+
+        ms = kmalloc(32768, GFP_KERNEL);
+
+        if (!ms)
+                return -ENOMEM;
+
+        file->private_data = ms;
+
+        p = ms->buf;
+
+        p = minstrel_ht_stats_csv_dump(mi, MINSTREL_CCK_GROUP, p);
+        for (i = 0; i < MINSTREL_CCK_GROUP; i++)
+                p = minstrel_ht_stats_csv_dump(mi, i, p);
+        for (i++; i < ARRAY_SIZE(mi->groups); i++)
+                p = minstrel_ht_stats_csv_dump(mi, i, p);
+
+        ms->len = p - ms->buf;
+        WARN_ON(ms->len + sizeof(*ms) > 32768);
+
+        return nonseekable_open(inode, file);
+}
+
+static const struct file_operations minstrel_ht_stat_csv_fops = {
+        .owner = THIS_MODULE,
+        .open = minstrel_ht_stats_csv_open,
+        .read = minstrel_stats_read,
+        .release = minstrel_stats_release,
+        .llseek = no_llseek,
+};
+
 void
 minstrel_ht_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir)
 {
@@ -167,6 +299,8 @@ minstrel_ht_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir)
 
         msp->dbg_stats = debugfs_create_file("rc_stats", S_IRUGO, dir, msp,
                         &minstrel_ht_stat_fops);
+        msp->dbg_stats_csv = debugfs_create_file("rc_stats_csv", S_IRUGO,
+                             dir, msp, &minstrel_ht_stat_csv_fops);
 }
 
 void
@@ -175,4 +309,5 @@ minstrel_ht_remove_sta_debugfs(void *priv, void *priv_sta)
         struct minstrel_ht_sta_priv *msp = priv_sta;
 
         debugfs_remove(msp->dbg_stats);
+        debugfs_remove(msp->dbg_stats_csv);
 }