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 <net/mac80211.h>
  14 #include "rc80211_minstrel.h"
  15 #include "rc80211_minstrel_ht.h"
  16
  17 static int
  18 minstrel_ht_stats_open(struct inode *inode, struct file *file)
  19 {
  20         struct minstrel_ht_sta_priv *msp = inode->i_private;
  21         struct minstrel_ht_sta *mi = &msp->ht;
  22         struct minstrel_debugfs_info *ms;
  23         unsigned int i, j, tp, prob, eprob;
  24         char *p;
  25         int ret;
  26
  27         if (!msp->is_ht) {
  28                 inode->i_private = &msp->legacy;
  29                 ret = minstrel_stats_open(inode, file);
  30                 inode->i_private = msp;
  31                 return ret;
  32         }
  33
  34         ms = kmalloc(sizeof(*ms) + 8192, GFP_KERNEL);
  35         if (!ms)
  36                 return -ENOMEM;
  37
  38         file->private_data = ms;
  39         p = ms->buf;
  40         p += sprintf(p, "type      rate     throughput  ewma prob   this prob  "
  41                         "this succ/attempt   success    attempts\n");
  42         for (i = 0; i < MINSTREL_MAX_STREAMS * MINSTREL_STREAM_GROUPS; i++) {
  43                 char htmode = '2';
  44                 char gimode = 'L';
  45
  46                 if (!mi->groups[i].supported)
  47                         continue;
  48
  49                 if (minstrel_mcs_groups[i].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
  50                         htmode = '4';
  51                 if (minstrel_mcs_groups[i].flags & IEEE80211_TX_RC_SHORT_GI)
  52                         gimode = 'S';
  53
  54                 for (j = 0; j < MCS_GROUP_RATES; j++) {
  55                         struct minstrel_rate_stats *mr = &mi->groups[i].rates[j];
  56                         int idx = i * MCS_GROUP_RATES + j;
  57
  58                         if (!(mi->groups[i].supported & BIT(j)))
  59                                 continue;
  60
  61                         p += sprintf(p, "HT%c0/%cGI ", htmode, gimode);
  62
  63                         *(p++) = (idx == mi->max_tp_rate) ? 'T' : ' ';
  64                         *(p++) = (idx == mi->max_tp_rate2) ? 't' : ' ';
  65                         *(p++) = (idx == mi->max_prob_rate) ? 'P' : ' ';
  66                         p += sprintf(p, "MCS%-2u", (minstrel_mcs_groups[i].streams - 1) *
  67                                         MCS_GROUP_RATES + j);
  68
  69                         tp = mr->cur_tp / 10;
  70                         prob = MINSTREL_TRUNC(mr->cur_prob * 1000);
  71                         eprob = MINSTREL_TRUNC(mr->probability * 1000);
  72
  73                         p += sprintf(p, "  %6u.%1u   %6u.%1u   %6u.%1u        "
  74                                         "%3u(%3u)   %8llu    %8llu\n",
  75                                         tp / 10, tp % 10,
  76                                         eprob / 10, eprob % 10,
  77                                         prob / 10, prob % 10,
  78                                         mr->last_success,
  79                                         mr->last_attempts,
  80                                         (unsigned long long)mr->succ_hist,
  81                                         (unsigned long long)mr->att_hist);
  82                 }
  83         }
  84         p += sprintf(p, "\nTotal packet count::    ideal %d      "
  85                         "lookaround %d\n",
  86                         max(0, (int) mi->total_packets - (int) mi->sample_packets),
  87                         mi->sample_packets);
  88         p += sprintf(p, "Average A-MPDU length: %d.%d\n",
  89                 MINSTREL_TRUNC(mi->avg_ampdu_len),
  90                 MINSTREL_TRUNC(mi->avg_ampdu_len * 10) % 10);
  91         ms->len = p - ms->buf;
  92
  93         return 0;
  94 }
  95
  96 static const struct file_operations minstrel_ht_stat_fops = {
  97         .owner = THIS_MODULE,
  98         .open = minstrel_ht_stats_open,
  99         .read = minstrel_stats_read,
 100         .release = minstrel_stats_release,
 101 };
 102
 103 void
 104 minstrel_ht_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir)
 105 {
 106         struct minstrel_ht_sta_priv *msp = priv_sta;
 107
 108         msp->dbg_stats = debugfs_create_file("rc_stats", S_IRUGO, dir, msp,
 109                         &minstrel_ht_stat_fops);
 110 }
 111
 112 void
 113 minstrel_ht_remove_sta_debugfs(void *priv, void *priv_sta)
 114 {
 115         struct minstrel_ht_sta_priv *msp = priv_sta;
 116
 117         debugfs_remove(msp->dbg_stats);
 118 }