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linux/net/mac80211/rc80211_minstrel_ht_debugfs.c
Al Viro cb787f4ac0 [tree-wide] finally take no_llseek out 
no_llseek had been defined to NULL two years ago, in commit 868941b144
("fs: remove no_llseek")

To quote that commit,

  At -rc1 we'll need do a mechanical removal of no_llseek -

  git grep -l -w no_llseek | grep -v porting.rst | while read i; do
	sed -i '/\<no_llseek\>/d' $i
  done

  would do it.

Unfortunately, that hadn't been done.  Linus, could you do that now, so
that we could finally put that thing to rest? All instances are of the
form
	.llseek = no_llseek,
so it's obviously safe.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2024-09-27 08:18:43 -07:00

335 lines
9.0 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2010 Felix Fietkau <nbd@openwrt.org>
*/
#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_ht.h"
struct minstrel_debugfs_info {
size_t len;
char buf[];
};
static 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);
}
static int
minstrel_stats_release(struct inode *inode, struct file *file)
{
kfree(file->private_data);
return 0;
}
static bool
minstrel_ht_is_sample_rate(struct minstrel_ht_sta *mi, int idx)
{
int type, i;
for (type = 0; type < ARRAY_SIZE(mi->sample); type++)
for (i = 0; i < MINSTREL_SAMPLE_RATES; i++)
if (mi->sample[type].cur_sample_rates[i] == idx)
return true;
return false;
}
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];
int idx = MI_RATE(i, j);
unsigned int duration;
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 if (i == MINSTREL_OFDM_GROUP) {
p += sprintf(p, "OFDM ");
p += sprintf(p, "1 ");
} 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' : ' ';
*(p++) = minstrel_ht_is_sample_rate(mi, idx) ? 'S' : ' ';
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;
if (i == MINSTREL_OFDM_GROUP)
r = minstrel_ofdm_bitrates[j % 8];
else
r = minstrel_cck_bitrates[j % 4];
p += sprintf(p, " %2u.%1uM", r / 10, r % 10);
}
p += sprintf(p, " %3u ", idx);
/* tx_time[rate(i)] in usec */
duration = mg->duration[j];
duration <<= mg->shift;
tx_time = DIV_ROUND_CLOSEST(duration, 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_avg);
eprob = MINSTREL_TRUNC(mrs->prob_avg * 1000);
p += sprintf(p, "%4u.%1u %4u.%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,
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 *mi = inode->i_private;
struct minstrel_debugfs_info *ms;
unsigned int i;
char *p;
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)] [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);
if (mi->avg_ampdu_len)
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,
};
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];
int idx = MI_RATE(i, j);
unsigned int duration;
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 if (i == MINSTREL_OFDM_GROUP) {
p += sprintf(p, "OFDM,,1,");
} 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" : ""));
p += sprintf(p, "%s", (minstrel_ht_is_sample_rate(mi, idx) ? "S" : ""));
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;
if (i == MINSTREL_OFDM_GROUP)
r = minstrel_ofdm_bitrates[j % 8];
else
r = minstrel_cck_bitrates[j % 4];
p += sprintf(p, ",%2u.%1uM,", r / 10, r % 10);
}
p += sprintf(p, "%u,", idx);
duration = mg->duration[j];
duration <<= mg->shift;
tx_time = DIV_ROUND_CLOSEST(duration, 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_avg);
eprob = MINSTREL_TRUNC(mrs->prob_avg * 1000);
p += sprintf(p, "%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,
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 *mi = inode->i_private;
struct minstrel_debugfs_info *ms;
unsigned int i;
char *p;
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,
};
void
minstrel_ht_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir)
{
debugfs_create_file("rc_stats", 0444, dir, priv_sta,
&minstrel_ht_stat_fops);
debugfs_create_file("rc_stats_csv", 0444, dir, priv_sta,
&minstrel_ht_stat_csv_fops);
}
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