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 char *
  19 minstrel_ht_stats_dump(struct minstrel_ht_sta *mi, int i, char *p)
  20 {
  21         const struct mcs_group *mg;
  22         unsigned int j, tp, prob, eprob;
  23         char htmode = '2';
  24         char gimode = 'L';
  25         u32 gflags;
  26
  27         if (!mi->groups[i].supported)
  28                 return p;
  29
  30         mg = &minstrel_mcs_groups[i];
  31         gflags = mg->flags;
  32
  33         if (gflags & IEEE80211_TX_RC_40_MHZ_WIDTH)
  34                 htmode = '4';
  35         else if (gflags & IEEE80211_TX_RC_80_MHZ_WIDTH)
  36                 htmode = '8';
  37         if (gflags & IEEE80211_TX_RC_SHORT_GI)
  38                 gimode = 'S';
  39
  40         for (j = 0; j < MCS_GROUP_RATES; j++) {
  41                 struct minstrel_rate_stats *mr = &mi->groups[i].rates[j];
  42                 static const int bitrates[4] = { 10, 20, 55, 110 };
  43                 int idx = i * MCS_GROUP_RATES + j;
  44
  45                 if (!(mi->groups[i].supported & BIT(j)))
  46                         continue;
  47
  48                 if (gflags & IEEE80211_TX_RC_MCS)
  49                         p += sprintf(p, " HT%c0/%cGI ", htmode, gimode);
  50                 else if (gflags & IEEE80211_TX_RC_VHT_MCS)
  51                         p += sprintf(p, "VHT%c0/%cGI ", htmode, gimode);
  52                 else
  53                         p += sprintf(p, " CCK/%cP   ", j < 4 ? 'L' : 'S');
  54
  55                 *(p++) = (idx == mi->max_tp_rate[0]) ? 'A' : ' ';
  56                 *(p++) = (idx == mi->max_tp_rate[1]) ? 'B' : ' ';
  57                 *(p++) = (idx == mi->max_tp_rate[2]) ? 'C' : ' ';
  58                 *(p++) = (idx == mi->max_tp_rate[3]) ? 'D' : ' ';
  59                 *(p++) = (idx == mi->max_prob_rate) ? 'P' : ' ';
  60
  61                 if (gflags & IEEE80211_TX_RC_MCS) {
  62                         p += sprintf(p, " MCS%-2u ", (mg->streams - 1) * 8 + j);
  63                 } else if (gflags & IEEE80211_TX_RC_VHT_MCS) {
  64                         p += sprintf(p, " MCS%-1u/%1u", j, mg->streams);
  65                 } else {
  66                         int r = bitrates[j % 4];
  67
  68                         p += sprintf(p, " %2u.%1uM ", r / 10, r % 10);
  69                 }
  70
  71                 tp = mr->cur_tp / 10;
  72                 prob = MINSTREL_TRUNC(mr->cur_prob * 1000);
  73                 eprob = MINSTREL_TRUNC(mr->probability * 1000);
  74
  75                 p += sprintf(p, " %4u.%1u %3u.%1u %3u.%1u "
  76                                 "%3u %4u(%4u) %9llu(%9llu)\n",
  77                                 tp / 10, tp % 10,
  78                                 eprob / 10, eprob % 10,
  79                                 prob / 10, prob % 10,
  80                                 mr->retry_count,
  81                                 mr->last_success,
  82                                 mr->last_attempts,
  83                                 (unsigned long long)mr->succ_hist,
  84                                 (unsigned long long)mr->att_hist);
  85         }
  86
  87         return p;
  88 }
  89
  90 static int
  91 minstrel_ht_stats_open(struct inode *inode, struct file *file)
  92 {
  93         struct minstrel_ht_sta_priv *msp = inode->i_private;
  94         struct minstrel_ht_sta *mi = &msp->ht;
  95         struct minstrel_debugfs_info *ms;
  96         unsigned int i;
  97         char *p;
  98         int ret;
  99
 100         if (!msp->is_ht) {
 101                 inode->i_private = &msp->legacy;
 102                 ret = minstrel_stats_open(inode, file);
 103                 inode->i_private = msp;
 104                 return ret;
 105         }
 106
 107         ms = kmalloc(32768, GFP_KERNEL);
 108         if (!ms)
 109                 return -ENOMEM;
 110
 111         file->private_data = ms;
 112         p = ms->buf;
 113         p += sprintf(p, " type           rate      tpt eprob *prob "
 114                         "ret  *ok(*cum)        ok(      cum)\n");
 115
 116         p = minstrel_ht_stats_dump(mi, MINSTREL_CCK_GROUP, p);
 117         for (i = 0; i < MINSTREL_CCK_GROUP; i++)
 118                 p = minstrel_ht_stats_dump(mi, i, p);
 119         for (i++; i < ARRAY_SIZE(mi->groups); i++)
 120                 p = minstrel_ht_stats_dump(mi, i, p);
 121
 122         p += sprintf(p, "\nTotal packet count::    ideal %d      "
 123                         "lookaround %d\n",
 124                         max(0, (int) mi->total_packets - (int) mi->sample_packets),
 125                         mi->sample_packets);
 126         p += sprintf(p, "Average A-MPDU length: %d.%d\n",
 127                 MINSTREL_TRUNC(mi->avg_ampdu_len),
 128                 MINSTREL_TRUNC(mi->avg_ampdu_len * 10) % 10);
 129         ms->len = p - ms->buf;
 130
 131         WARN_ON(ms->len + sizeof(*ms) > 32768);
 132
 133         return nonseekable_open(inode, file);
 134 }
 135
 136 static const struct file_operations minstrel_ht_stat_fops = {
 137         .owner = THIS_MODULE,
 138         .open = minstrel_ht_stats_open,
 139         .read = minstrel_stats_read,
 140         .release = minstrel_stats_release,
 141         .llseek = no_llseek,
 142 };
 143
 144 void
 145 minstrel_ht_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir)
 146 {
 147         struct minstrel_ht_sta_priv *msp = priv_sta;
 148
 149         msp->dbg_stats = debugfs_create_file("rc_stats", S_IRUGO, dir, msp,
 150                         &minstrel_ht_stat_fops);
 151 }
 152
 153 void
 154 minstrel_ht_remove_sta_debugfs(void *priv, void *priv_sta)
 155 {
 156         struct minstrel_ht_sta_priv *msp = priv_sta;
 157
 158         debugfs_remove(msp->dbg_stats);
 159 }