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linux/net/mac80211/rc80211_minstrel_ht_debugfs.c
Felix Fietkau 4f0bc9c61b mac80211: minstrel: store probability variance instead of standard deviation 
This avoids the costly int_sqrt calls in the statistics update and moves
it to the debugfs code instead.
This also fixes an overflow in the previous standard deviation
calculation.

Signed-off-by: Thomas Huehn <thomas.huehn@evernet-eg.de>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2016-12-15 11:07:52 +01:00

320 lines
8.9 KiB
C
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/*
* Copyright (C) 2010 Felix Fietkau <nbd@openwrt.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/netdevice.h>
#include <linux/types.h>
#include <linux/skbuff.h>
#include <linux/debugfs.h>
#include <linux/ieee80211.h>
#include <linux/export.h>
#include <net/mac80211.h>
#include "rc80211_minstrel.h"
#include "rc80211_minstrel_ht.h"
static char *
minstrel_ht_stats_dump(struct minstrel_ht_sta *mi, int i, char *p)
{
const struct mcs_group *mg;
unsigned int j, tp_max, tp_avg, eprob, tx_time;
char htmode = '2';
char gimode = 'L';
u32 gflags;
if (!mi->supported[i])
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 *mrs = &mi->groups[i].rates[j];
static const int bitrates[4] = { 10, 20, 55, 110 };
int idx = i * MCS_GROUP_RATES + j;
unsigned int prob_ewmsd;
if (!(mi->supported[i] & 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++) = (idx == mi->max_tp_rate[0]) ? 'A' : ' ';
*(p++) = (idx == mi->max_tp_rate[1]) ? 'B' : ' ';
*(p++) = (idx == mi->max_tp_rate[2]) ? 'C' : ' ';
*(p++) = (idx == mi->max_tp_rate[3]) ? 'D' : ' ';
*(p++) = (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, " %3u ", idx);
/* tx_time[rate(i)] in usec */
tx_time = DIV_ROUND_CLOSEST(mg->duration[j], 1000);
p += sprintf(p, "%6u ", tx_time);
tp_max = minstrel_ht_get_tp_avg(mi, i, j, MINSTREL_FRAC(100, 100));
tp_avg = minstrel_ht_get_tp_avg(mi, i, j, mrs->prob_ewma);
eprob = MINSTREL_TRUNC(mrs->prob_ewma * 1000);
prob_ewmsd = minstrel_get_ewmsd10(mrs);
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_ewmsd / 10, prob_ewmsd % 10,
mrs->retry_count,
mrs->last_success,
mrs->last_attempts,
(unsigned long long)mrs->succ_hist,
(unsigned long long)mrs->att_hist);
}
return p;
}
static int
minstrel_ht_stats_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_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 += sprintf(p, "\n");
p += sprintf(p,
" best ____________rate__________ ________statistics________ _____last____ ______sum-of________\n");
p += sprintf(p,
"mode guard # rate [name idx airtime max_tp] [avg(tp) avg(prob) sd(prob)] [retry|suc|att] [#success | #attempts]\n");
p = minstrel_ht_stats_dump(mi, MINSTREL_CCK_GROUP, p);
for (i = 0; i < MINSTREL_CCK_GROUP; i++)
p = minstrel_ht_stats_dump(mi, i, p);
for (i++; i < ARRAY_SIZE(mi->groups); i++)
p = minstrel_ht_stats_dump(mi, i, p);
p += sprintf(p, "\nTotal packet count:: ideal %d "
"lookaround %d\n",
max(0, (int) mi->total_packets - (int) mi->sample_packets),
mi->sample_packets);
p += sprintf(p, "Average # of aggregated frames per A-MPDU: %d.%d\n",
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);
}
static const struct file_operations minstrel_ht_stat_fops = {
.owner = THIS_MODULE,
.open = minstrel_ht_stats_open,
.read = minstrel_stats_read,
.release = minstrel_stats_release,
.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_max, tp_avg, eprob, tx_time;
char htmode = '2';
char gimode = 'L';
u32 gflags;
if (!mi->supported[i])
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 *mrs = &mi->groups[i].rates[j];
static const int bitrates[4] = { 10, 20, 55, 110 };
int idx = i * MCS_GROUP_RATES + j;
unsigned int prob_ewmsd;
if (!(mi->supported[i] & 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_max = minstrel_ht_get_tp_avg(mi, i, j, MINSTREL_FRAC(100, 100));
tp_avg = minstrel_ht_get_tp_avg(mi, i, j, mrs->prob_ewma);
eprob = MINSTREL_TRUNC(mrs->prob_ewma * 1000);
prob_ewmsd = minstrel_get_ewmsd10(mrs);
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_ewmsd / 10, prob_ewmsd % 10,
mrs->retry_count,
mrs->last_success,
mrs->last_attempts,
(unsigned long long)mrs->succ_hist,
(unsigned long long)mrs->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)
{
struct minstrel_ht_sta_priv *msp = priv_sta;
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
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);
}
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