net/mac80211/rc80211_minstrel_ht_debugfs.c

   1 /*
   2  * Copyright (C) 2010 Felix Fietkau <nbd@openwrt.org>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8 #include <linux/netdevice.h>
   9 #include <linux/types.h>
  10 #include <linux/skbuff.h>
  11 #include <linux/debugfs.h>
  12 #include <linux/ieee80211.h>
  13 #include <linux/export.h>
  14 #include <net/mac80211.h>
  15 #include "rc80211_minstrel.h"
  16 #include "rc80211_minstrel_ht.h"
  17
  18 static ssize_t
  19 minstrel_stats_read(struct file *file, char __user *buf, size_t len, loff_t *ppos)
  20 {
  21         struct minstrel_debugfs_info *ms;
  22
  23         ms = file->private_data;
  24         return simple_read_from_buffer(buf, len, ppos, ms->buf, ms->len);
  25 }
  26
  27 static int
  28 minstrel_stats_release(struct inode *inode, struct file *file)
  29 {
  30         kfree(file->private_data);
  31         return 0;
  32 }
  33
  34 static char *
  35 minstrel_ht_stats_dump(struct minstrel_ht_sta *mi, int i, char *p)
  36 {
  37         const struct mcs_group *mg;
  38         unsigned int j, tp_max, tp_avg, eprob, tx_time;
  39         char htmode = '2';
  40         char gimode = 'L';
  41         u32 gflags;
  42
  43         if (!mi->supported[i])
  44                 return p;
  45
  46         mg = &minstrel_mcs_groups[i];
  47         gflags = mg->flags;
  48
  49         if (gflags & IEEE80211_TX_RC_40_MHZ_WIDTH)
  50                 htmode = '4';
  51         else if (gflags & IEEE80211_TX_RC_80_MHZ_WIDTH)
  52                 htmode = '8';
  53         if (gflags & IEEE80211_TX_RC_SHORT_GI)
  54                 gimode = 'S';
  55
  56         for (j = 0; j < MCS_GROUP_RATES; j++) {
  57                 struct minstrel_rate_stats *mrs = &mi->groups[i].rates[j];
  58                 static const int bitrates[4] = { 10, 20, 55, 110 };
  59                 int idx = i * MCS_GROUP_RATES + j;
  60                 unsigned int duration;
  61
  62                 if (!(mi->supported[i] & BIT(j)))
  63                         continue;
  64
  65                 if (gflags & IEEE80211_TX_RC_MCS) {
  66                         p += sprintf(p, "HT%c0  ", htmode);
  67                         p += sprintf(p, "%cGI  ", gimode);
  68                         p += sprintf(p, "%d  ", mg->streams);
  69                 } else if (gflags & IEEE80211_TX_RC_VHT_MCS) {
  70                         p += sprintf(p, "VHT%c0 ", htmode);
  71                         p += sprintf(p, "%cGI ", gimode);
  72                         p += sprintf(p, "%d  ", mg->streams);
  73                 } else {
  74                         p += sprintf(p, "CCK    ");
  75                         p += sprintf(p, "%cP  ", j < 4 ? 'L' : 'S');
  76                         p += sprintf(p, "1 ");
  77                 }
  78
  79                 *(p++) = (idx == mi->max_tp_rate[0]) ? 'A' : ' ';
  80                 *(p++) = (idx == mi->max_tp_rate[1]) ? 'B' : ' ';
  81                 *(p++) = (idx == mi->max_tp_rate[2]) ? 'C' : ' ';
  82                 *(p++) = (idx == mi->max_tp_rate[3]) ? 'D' : ' ';
  83                 *(p++) = (idx == mi->max_prob_rate) ? 'P' : ' ';
  84
  85                 if (gflags & IEEE80211_TX_RC_MCS) {
  86                         p += sprintf(p, "  MCS%-2u", (mg->streams - 1) * 8 + j);
  87                 } else if (gflags & IEEE80211_TX_RC_VHT_MCS) {
  88                         p += sprintf(p, "  MCS%-1u/%1u", j, mg->streams);
  89                 } else {
  90                         int r = bitrates[j % 4];
  91
  92                         p += sprintf(p, "   %2u.%1uM", r / 10, r % 10);
  93                 }
  94
  95                 p += sprintf(p, "  %3u  ", idx);
  96
  97                 /* tx_time[rate(i)] in usec */
  98                 duration = mg->duration[j];
  99                 duration <<= mg->shift;
 100                 tx_time = DIV_ROUND_CLOSEST(duration, 1000);
 101                 p += sprintf(p, "%6u  ", tx_time);
 102
 103                 tp_max = minstrel_ht_get_tp_avg(mi, i, j, MINSTREL_FRAC(100, 100));
 104                 tp_avg = minstrel_ht_get_tp_avg(mi, i, j, mrs->prob_ewma);
 105                 eprob = MINSTREL_TRUNC(mrs->prob_ewma * 1000);
 106
 107                 p += sprintf(p, "%4u.%1u    %4u.%1u     %3u.%1u"
 108                                 "     %3u   %3u %-3u   "
 109                                 "%9llu   %-9llu\n",
 110                                 tp_max / 10, tp_max % 10,
 111                                 tp_avg / 10, tp_avg % 10,
 112                                 eprob / 10, eprob % 10,
 113                                 mrs->retry_count,
 114                                 mrs->last_success,
 115                                 mrs->last_attempts,
 116                                 (unsigned long long)mrs->succ_hist,
 117                                 (unsigned long long)mrs->att_hist);
 118         }
 119
 120         return p;
 121 }
 122
 123 static int
 124 minstrel_ht_stats_open(struct inode *inode, struct file *file)
 125 {
 126         struct minstrel_ht_sta_priv *msp = inode->i_private;
 127         struct minstrel_ht_sta *mi = &msp->ht;
 128         struct minstrel_debugfs_info *ms;
 129         unsigned int i;
 130         int ret;
 131         char *p;
 132
 133         if (!msp->is_ht) {
 134                 inode->i_private = &msp->legacy;
 135                 ret = minstrel_stats_open(inode, file);
 136                 inode->i_private = msp;
 137                 return ret;
 138         }
 139
 140         ms = kmalloc(32768, GFP_KERNEL);
 141         if (!ms)
 142                 return -ENOMEM;
 143
 144         file->private_data = ms;
 145         p = ms->buf;
 146
 147         p += sprintf(p, "\n");
 148         p += sprintf(p,
 149                      "              best   ____________rate__________    ____statistics___    _____last____    ______sum-of________\n");
 150         p += sprintf(p,
 151                      "mode guard #  rate  [name   idx airtime  max_tp]  [avg(tp) avg(prob)]  [retry|suc|att]  [#success | #attempts]\n");
 152
 153         p = minstrel_ht_stats_dump(mi, MINSTREL_CCK_GROUP, p);
 154         for (i = 0; i < MINSTREL_CCK_GROUP; i++)
 155                 p = minstrel_ht_stats_dump(mi, i, p);
 156         for (i++; i < ARRAY_SIZE(mi->groups); i++)
 157                 p = minstrel_ht_stats_dump(mi, i, p);
 158
 159         p += sprintf(p, "\nTotal packet count::    ideal %d      "
 160                         "lookaround %d\n",
 161                         max(0, (int) mi->total_packets - (int) mi->sample_packets),
 162                         mi->sample_packets);
 163         p += sprintf(p, "Average # of aggregated frames per A-MPDU: %d.%d\n",
 164                 MINSTREL_TRUNC(mi->avg_ampdu_len),
 165                 MINSTREL_TRUNC(mi->avg_ampdu_len * 10) % 10);
 166         ms->len = p - ms->buf;
 167         WARN_ON(ms->len + sizeof(*ms) > 32768);
 168
 169         return nonseekable_open(inode, file);
 170 }
 171
 172 static const struct file_operations minstrel_ht_stat_fops = {
 173         .owner = THIS_MODULE,
 174         .open = minstrel_ht_stats_open,
 175         .read = minstrel_stats_read,
 176         .release = minstrel_stats_release,
 177         .llseek = no_llseek,
 178 };
 179
 180 static char *
 181 minstrel_ht_stats_csv_dump(struct minstrel_ht_sta *mi, int i, char *p)
 182 {
 183         const struct mcs_group *mg;
 184         unsigned int j, tp_max, tp_avg, eprob, tx_time;
 185         char htmode = '2';
 186         char gimode = 'L';
 187         u32 gflags;
 188
 189         if (!mi->supported[i])
 190                 return p;
 191
 192         mg = &minstrel_mcs_groups[i];
 193         gflags = mg->flags;
 194
 195         if (gflags & IEEE80211_TX_RC_40_MHZ_WIDTH)
 196                 htmode = '4';
 197         else if (gflags & IEEE80211_TX_RC_80_MHZ_WIDTH)
 198                 htmode = '8';
 199         if (gflags & IEEE80211_TX_RC_SHORT_GI)
 200                 gimode = 'S';
 201
 202         for (j = 0; j < MCS_GROUP_RATES; j++) {
 203                 struct minstrel_rate_stats *mrs = &mi->groups[i].rates[j];
 204                 static const int bitrates[4] = { 10, 20, 55, 110 };
 205                 int idx = i * MCS_GROUP_RATES + j;
 206                 unsigned int duration;
 207
 208                 if (!(mi->supported[i] & BIT(j)))
 209                         continue;
 210
 211                 if (gflags & IEEE80211_TX_RC_MCS) {
 212                         p += sprintf(p, "HT%c0,", htmode);
 213                         p += sprintf(p, "%cGI,", gimode);
 214                         p += sprintf(p, "%d,", mg->streams);
 215                 } else if (gflags & IEEE80211_TX_RC_VHT_MCS) {
 216                         p += sprintf(p, "VHT%c0,", htmode);
 217                         p += sprintf(p, "%cGI,", gimode);
 218                         p += sprintf(p, "%d,", mg->streams);
 219                 } else {
 220                         p += sprintf(p, "CCK,");
 221                         p += sprintf(p, "%cP,", j < 4 ? 'L' : 'S');
 222                         p += sprintf(p, "1,");
 223                 }
 224
 225                 p += sprintf(p, "%s" ,((idx == mi->max_tp_rate[0]) ? "A" : ""));
 226                 p += sprintf(p, "%s" ,((idx == mi->max_tp_rate[1]) ? "B" : ""));
 227                 p += sprintf(p, "%s" ,((idx == mi->max_tp_rate[2]) ? "C" : ""));
 228                 p += sprintf(p, "%s" ,((idx == mi->max_tp_rate[3]) ? "D" : ""));
 229                 p += sprintf(p, "%s" ,((idx == mi->max_prob_rate) ? "P" : ""));
 230
 231                 if (gflags & IEEE80211_TX_RC_MCS) {
 232                         p += sprintf(p, ",MCS%-2u,", (mg->streams - 1) * 8 + j);
 233                 } else if (gflags & IEEE80211_TX_RC_VHT_MCS) {
 234                         p += sprintf(p, ",MCS%-1u/%1u,", j, mg->streams);
 235                 } else {
 236                         int r = bitrates[j % 4];
 237                         p += sprintf(p, ",%2u.%1uM,", r / 10, r % 10);
 238                 }
 239
 240                 p += sprintf(p, "%u,", idx);
 241
 242                 duration = mg->duration[j];
 243                 duration <<= mg->shift;
 244                 tx_time = DIV_ROUND_CLOSEST(duration, 1000);
 245                 p += sprintf(p, "%u,", tx_time);
 246
 247                 tp_max = minstrel_ht_get_tp_avg(mi, i, j, MINSTREL_FRAC(100, 100));
 248                 tp_avg = minstrel_ht_get_tp_avg(mi, i, j, mrs->prob_ewma);
 249                 eprob = MINSTREL_TRUNC(mrs->prob_ewma * 1000);
 250
 251                 p += sprintf(p, "%u.%u,%u.%u,%u.%u,%u,%u,"
 252                                 "%u,%llu,%llu,",
 253                                 tp_max / 10, tp_max % 10,
 254                                 tp_avg / 10, tp_avg % 10,
 255                                 eprob / 10, eprob % 10,
 256                                 mrs->retry_count,
 257                                 mrs->last_success,
 258                                 mrs->last_attempts,
 259                                 (unsigned long long)mrs->succ_hist,
 260                                 (unsigned long long)mrs->att_hist);
 261                 p += sprintf(p, "%d,%d,%d.%d\n",
 262                                 max(0, (int) mi->total_packets -
 263                                 (int) mi->sample_packets),
 264                                 mi->sample_packets,
 265                                 MINSTREL_TRUNC(mi->avg_ampdu_len),
 266                                 MINSTREL_TRUNC(mi->avg_ampdu_len * 10) % 10);
 267         }
 268
 269         return p;
 270 }
 271
 272 static int
 273 minstrel_ht_stats_csv_open(struct inode *inode, struct file *file)
 274 {
 275         struct minstrel_ht_sta_priv *msp = inode->i_private;
 276         struct minstrel_ht_sta *mi = &msp->ht;
 277         struct minstrel_debugfs_info *ms;
 278         unsigned int i;
 279         int ret;
 280         char *p;
 281
 282         if (!msp->is_ht) {
 283                 inode->i_private = &msp->legacy;
 284                 ret = minstrel_stats_csv_open(inode, file);
 285                 inode->i_private = msp;
 286                 return ret;
 287         }
 288
 289         ms = kmalloc(32768, GFP_KERNEL);
 290
 291         if (!ms)
 292                 return -ENOMEM;
 293
 294         file->private_data = ms;
 295
 296         p = ms->buf;
 297
 298         p = minstrel_ht_stats_csv_dump(mi, MINSTREL_CCK_GROUP, p);
 299         for (i = 0; i < MINSTREL_CCK_GROUP; i++)
 300                 p = minstrel_ht_stats_csv_dump(mi, i, p);
 301         for (i++; i < ARRAY_SIZE(mi->groups); i++)
 302                 p = minstrel_ht_stats_csv_dump(mi, i, p);
 303
 304         ms->len = p - ms->buf;
 305         WARN_ON(ms->len + sizeof(*ms) > 32768);
 306
 307         return nonseekable_open(inode, file);
 308 }
 309
 310 static const struct file_operations minstrel_ht_stat_csv_fops = {
 311         .owner = THIS_MODULE,
 312         .open = minstrel_ht_stats_csv_open,
 313         .read = minstrel_stats_read,
 314         .release = minstrel_stats_release,
 315         .llseek = no_llseek,
 316 };
 317
 318 void
 319 minstrel_ht_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir)
 320 {
 321         struct minstrel_ht_sta_priv *msp = priv_sta;
 322
 323         debugfs_create_file("rc_stats", 0444, dir, msp,
 324                             &minstrel_ht_stat_fops);
 325         debugfs_create_file("rc_stats_csv", 0444, dir, msp,
 326                             &minstrel_ht_stat_csv_fops);
 327 }