This patch adds the new statistic "maximum possible lossless
throughput" to Minstrels and Minstrel-HTs rc_stats (in debugfs). This
enables comprehensive comparison between current per-rate throughput
and max. achievable per-rate throughput.
Signed-off-by: Thomas Huehn <thomas@xxxxxxxxxxxxxxxxxxxxxxx>
---
net/mac80211/rc80211_minstrel.c | 12 ++++++++++++
net/mac80211/rc80211_minstrel.h | 1 +
net/mac80211/rc80211_minstrel_debugfs.c | 18 +++++++++++-------
net/mac80211/rc80211_minstrel_ht.c | 19 +++++++++++++++++++
net/mac80211/rc80211_minstrel_ht.h | 1 +
net/mac80211/rc80211_minstrel_ht_debugfs.c | 20 ++++++++++++--------
6 files changed, 56 insertions(+), 15 deletions(-)
diff --git a/net/mac80211/rc80211_minstrel.c b/net/mac80211/rc80211_minstrel.c
index 28de2f7a..42dfef8 100644
--- a/net/mac80211/rc80211_minstrel.c
+++ b/net/mac80211/rc80211_minstrel.c
@@ -87,7 +87,19 @@ int minstrel_get_tp_avg(struct minstrel_rate *mr)
return tp_avg;
}
+/* return max. potential lossless throughput */
+int minstrel_get_tp_max(struct minstrel_rate *mr)
+{
+ int tp_max, usecs;
+ usecs = mr->perfect_tx_time;
+ if (!usecs)
+ usecs = 1000000;
+
+ tp_max = 100000 / usecs;
+
+ return tp_max;
+}
/* find & sort topmost throughput rates */
static inline void
diff --git a/net/mac80211/rc80211_minstrel.h b/net/mac80211/rc80211_minstrel.h
index 490df3b..6693d8d 100644
--- a/net/mac80211/rc80211_minstrel.h
+++ b/net/mac80211/rc80211_minstrel.h
@@ -135,6 +135,7 @@ void minstrel_remove_sta_debugfs(void *priv, void *priv_sta);
/* Recalculate success probabilities and counters for a given rate using EWMA */
void minstrel_calc_rate_stats(struct minstrel_rate_stats *mrs);
int minstrel_get_tp_avg(struct minstrel_rate *mr);
+int minstrel_get_tp_max(struct minstrel_rate *mr);
/* debugfs */
int minstrel_stats_open(struct inode *inode, struct file *file);
diff --git a/net/mac80211/rc80211_minstrel_debugfs.c b/net/mac80211/rc80211_minstrel_debugfs.c
index d8ccef7..182d552 100644
--- a/net/mac80211/rc80211_minstrel_debugfs.c
+++ b/net/mac80211/rc80211_minstrel_debugfs.c
@@ -75,7 +75,7 @@ minstrel_stats_open(struct inode *inode, struct file *file)
{
struct minstrel_sta_info *mi = inode->i_private;
struct minstrel_debugfs_info *ms;
- unsigned int i, tp_avg, prob, eprob;
+ unsigned int i, tp_max, tp_avg, prob, eprob;
char *p;
ms = kmalloc(2048, GFP_KERNEL);
@@ -85,9 +85,9 @@ minstrel_stats_open(struct inode *inode, struct file *file)
file->private_data = ms;
p = ms->buf;
p += sprintf(p, "\n");
- p += sprintf(p, "best _______rate_____ __statistics__ "
+ p += sprintf(p, "best __________rate_________ __statistics__ "
"________last_______ ______sum-of________\n");
- p += sprintf(p, "rate [name idx airtime] [ ø(tp) ø(prob)] "
+ p += sprintf(p, "rate [name idx airtime max_tp] [ ø(tp) ø(prob)] "
"[prob.|retry|suc|att] [#success | #attempts]\n");
for (i = 0; i < mi->n_rates; i++) {
@@ -103,14 +103,16 @@ minstrel_stats_open(struct inode *inode, struct file *file)
p += sprintf(p, " %3u%s ", mr->bitrate / 2,
(mr->bitrate & 1 ? ".5" : " "));
p += sprintf(p, "%3u ", i);
- p += sprintf(p, "%6u ", mr->perfect_tx_time);
+ p += sprintf(p, "%6u ", mr->perfect_tx_time);
+ tp_max = minstrel_get_tp_max(mr);
tp_avg = minstrel_get_tp_avg(mr);
prob = MINSTREL_TRUNC(mrs->cur_prob * 1000);
eprob = MINSTREL_TRUNC(mrs->prob_ewma * 1000);
- p += sprintf(p, " %4u.%1u %3u.%1u %3u.%1u %3u"
+ p += sprintf(p, "%4u.%1u %4u.%1u %3u.%1u %3u.%1u %3u"
" %3u %-3u %9llu %-9llu\n",
+ tp_max / 10, tp_max % 10,
tp_avg / 10, tp_avg % 10,
eprob / 10, eprob % 10,
prob / 10, prob % 10,
@@ -145,7 +147,7 @@ minstrel_stats_csv_open(struct inode *inode, struct file *file)
struct minstrel_sta_info *mi = inode->i_private;
struct minstrel_debugfs_info *ms;
struct timeval tv;
- unsigned int i, tp_avg, prob, eprob;
+ unsigned int i, tp_max, tp_avg, prob, eprob;
char *p;
ms = kmalloc(2048, GFP_KERNEL);
@@ -173,12 +175,14 @@ minstrel_stats_csv_open(struct inode *inode, struct file *file)
p += sprintf(p, "%u,", i);
p += sprintf(p, "%u,",mr->perfect_tx_time);
+ tp_max = minstrel_get_tp_max(mr);
tp_avg = minstrel_get_tp_avg(mr);
prob = MINSTREL_TRUNC(mrs->cur_prob * 1000);
eprob = MINSTREL_TRUNC(mrs->prob_ewma * 1000);
- p += sprintf(p, "%u.%u,%u.%u,%u.%u,%u,%u,%u,"
+ p += sprintf(p, "%u.%u,%u.%u,%u.%u,%u.%u,%u,%u,%u,"
"%llu,%llu,%d,%d\n",
+ tp_max / 10, tp_max % 10,
tp_avg / 10, tp_avg % 10,
eprob / 10, eprob % 10,
prob / 10, prob % 10,
diff --git a/net/mac80211/rc80211_minstrel_ht.c b/net/mac80211/rc80211_minstrel_ht.c
index 2a55f63..b62b04e 100644
--- a/net/mac80211/rc80211_minstrel_ht.c
+++ b/net/mac80211/rc80211_minstrel_ht.c
@@ -350,6 +350,25 @@ minstrel_ht_get_tp_avg(struct minstrel_ht_sta *mi, int group, int rate)
}
/*
+ * Return max. potential lossless throughput based on the average A-MPDU
+ */
+int
+minstrel_ht_get_tp_max(struct minstrel_ht_sta *mi, int group, int rate)
+{
+ unsigned int nsecs = 0;
+ unsigned int tp_max;
+
+ if (group != MINSTREL_CCK_GROUP)
+ nsecs = 1000 * mi->overhead / MINSTREL_TRUNC(mi->avg_ampdu_len);
+
+ nsecs += minstrel_mcs_groups[group].duration[rate];
+ tp_max = 100000000 / nsecs;
+
+ return tp_max;
+}
+
+
+/*
* Find & sort topmost throughput rates
*
* If multiple rates provide equal throughput the sorting is based on their
diff --git a/net/mac80211/rc80211_minstrel_ht.h b/net/mac80211/rc80211_minstrel_ht.h
index 68dce4f..b1ea339 100644
--- a/net/mac80211/rc80211_minstrel_ht.h
+++ b/net/mac80211/rc80211_minstrel_ht.h
@@ -122,5 +122,6 @@ struct minstrel_ht_sta_priv {
void minstrel_ht_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir);
void minstrel_ht_remove_sta_debugfs(void *priv, void *priv_sta);
int minstrel_ht_get_tp_avg(struct minstrel_ht_sta *mi, int group, int rate);
+int minstrel_ht_get_tp_max(struct minstrel_ht_sta *mi, int group, int rate);
#endif
diff --git a/net/mac80211/rc80211_minstrel_ht_debugfs.c b/net/mac80211/rc80211_minstrel_ht_debugfs.c
index ce3baab..e70961f 100644
--- a/net/mac80211/rc80211_minstrel_ht_debugfs.c
+++ b/net/mac80211/rc80211_minstrel_ht_debugfs.c
@@ -19,7 +19,7 @@ static char *
minstrel_ht_stats_dump(struct minstrel_ht_sta *mi, int i, char *p)
{
const struct mcs_group *mg;
- unsigned int j, tp_avg, prob, eprob, tx_time;
+ unsigned int j, tp_max, tp_avg, prob, eprob, tx_time;
char htmode = '2';
char gimode = 'L';
u32 gflags;
@@ -79,14 +79,16 @@ minstrel_ht_stats_dump(struct minstrel_ht_sta *mi, int i, char *p)
/* tx_time[rate(i)] in usec */
tx_time = DIV_ROUND_CLOSEST(mg->duration[j], 1000);
- p += sprintf(p, "%6u ", tx_time);
+ p += sprintf(p, "%6u ", tx_time);
+ tp_max = minstrel_ht_get_tp_max(mi, i, j);
tp_avg = minstrel_ht_get_tp_avg(mi, i, j);
prob = MINSTREL_TRUNC(mrs->cur_prob * 1000);
eprob = MINSTREL_TRUNC(mrs->prob_ewma * 1000);
- p += sprintf(p, "%4u.%1u %3u.%1u %3u.%1u "
+ p += sprintf(p, "%4u.%1u %4u.%1u %3u.%1u %3u.%1u "
"%3u %3u %-3u %9llu %-9llu\n",
+ tp_max / 10, tp_max % 10,
tp_avg / 10, tp_avg % 10,
eprob / 10, eprob % 10,
prob / 10, prob % 10,
@@ -125,11 +127,11 @@ minstrel_ht_stats_open(struct inode *inode, struct file *file)
p = ms->buf;
p += sprintf(p, "\n");
- p += sprintf(p, " best ________rate______ "
+ p += sprintf(p, " best ____________rate__________ "
"__statistics__ ________last_______ "
"______sum-of________\n");
- p += sprintf(p, "mode guard # rate [name idx airtime] [ ø(tp) "
- "ø(prob)] [prob.|retry|suc|att] [#success | "
+ p += sprintf(p, "mode guard # rate [name idx airtime max_tp] "
+ "[ ø(tp) ø(prob)] [prob.|retry|suc|att] [#success | "
"#attempts]\n");
p = minstrel_ht_stats_dump(mi, MINSTREL_CCK_GROUP, p);
@@ -164,7 +166,7 @@ minstrel_ht_stats_csv_dump(struct minstrel_ht_sta *mi, int i, char *p,
struct timeval tv)
{
const struct mcs_group *mg;
- unsigned int j, tp_avg, prob, eprob, tx_time;
+ unsigned int j, tp_max, tp_avg, prob, eprob, tx_time;
char htmode = '2';
char gimode = 'L';
u32 gflags;
@@ -225,11 +227,13 @@ minstrel_ht_stats_csv_dump(struct minstrel_ht_sta *mi, int i, char *p,
tx_time = DIV_ROUND_CLOSEST(mg->duration[j], 1000);
p += sprintf(p, "%u,", tx_time);
+ tp_max = minstrel_ht_get_tp_max(mi, i, j);
tp_avg = minstrel_ht_get_tp_avg(mi, i, j);
prob = MINSTREL_TRUNC(mrs->cur_prob * 1000);
eprob = MINSTREL_TRUNC(mrs->prob_ewma * 1000);
- p += sprintf(p, "%u.%u,%u.%u,%u.%u,%u,%u,%u,%llu,%llu,",
+ p += sprintf(p, "%u.%u,%u.%u,%u.%u,%u.%u,%u,%u,%u,%llu,%llu,",
+ tp_max / 10, tp_max % 10,
tp_avg / 10, tp_avg % 10,
eprob / 10, eprob % 10,
prob / 10, prob % 10,
--
2.2.2
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