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 int
  19 minstrel_ht_stats_open(struct inode *inode, struct file *file)
  20 {
  21         struct minstrel_ht_sta_priv *msp = inode->i_private;
  22         struct minstrel_ht_sta *mi = &msp->ht;
  23         struct minstrel_debugfs_info *ms;
  24         unsigned int i, j, tp, prob, eprob;
  25         char *p;
  26         int ret;
  27
  28         if (!msp->is_ht) {
  29                 inode->i_private = &msp->legacy;
  30                 ret = minstrel_stats_open(inode, file);
  31                 inode->i_private = msp;
  32                 return ret;
  33         }
  34
  35         ms = kmalloc(sizeof(*ms) + 8192, GFP_KERNEL);
  36         if (!ms)
  37                 return -ENOMEM;
  38
  39         file->private_data = ms;
  40         p = ms->buf;
  41         p += sprintf(p, "type      rate     throughput  ewma prob   this prob  "
  42                         "this succ/attempt   success    attempts\n");
  43         for (i = 0; i < MINSTREL_MAX_STREAMS * MINSTREL_STREAM_GROUPS; i++) {
  44                 char htmode = '2';
  45                 char gimode = 'L';
  46
  47                 if (!mi->groups[i].supported)
  48                         continue;
  49
  50                 if (minstrel_mcs_groups[i].flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
  51                         htmode = '4';
  52                 if (minstrel_mcs_groups[i].flags & IEEE80211_TX_RC_SHORT_GI)
  53                         gimode = 'S';
  54
  55                 for (j = 0; j < MCS_GROUP_RATES; j++) {
  56                         struct minstrel_rate_stats *mr = &mi->groups[i].rates[j];
  57                         int idx = i * MCS_GROUP_RATES + j;
  58
  59                         if (!(mi->groups[i].supported & BIT(j)))
  60                                 continue;
  61
  62                         p += sprintf(p, "HT%c0/%cGI ", htmode, gimode);
  63
  64                         *(p++) = (idx == mi->max_tp_rate) ? 'T' : ' ';
  65                         *(p++) = (idx == mi->max_tp_rate2) ? 't' : ' ';
  66                         *(p++) = (idx == mi->max_prob_rate) ? 'P' : ' ';
  67                         p += sprintf(p, "MCS%-2u", (minstrel_mcs_groups[i].streams - 1) *
  68                                         MCS_GROUP_RATES + j);
  69
  70                         tp = mr->cur_tp / 10;
  71                         prob = MINSTREL_TRUNC(mr->cur_prob * 1000);
  72                         eprob = MINSTREL_TRUNC(mr->probability * 1000);
  73
  74                         p += sprintf(p, "  %6u.%1u   %6u.%1u   %6u.%1u        "
  75                                         "%3u(%3u)   %8llu    %8llu\n",
  76                                         tp / 10, tp % 10,
  77                                         eprob / 10, eprob % 10,
  78                                         prob / 10, prob % 10,
  79                                         mr->last_success,
  80                                         mr->last_attempts,
  81                                         (unsigned long long)mr->succ_hist,
  82                                         (unsigned long long)mr->att_hist);
  83                 }
  84         }
  85         p += sprintf(p, "\nTotal packet count::    ideal %d      "
  86                         "lookaround %d\n",
  87                         max(0, (int) mi->total_packets - (int) mi->sample_packets),
  88                         mi->sample_packets);
  89         p += sprintf(p, "Average A-MPDU length: %d.%d\n",
  90                 MINSTREL_TRUNC(mi->avg_ampdu_len),
  91                 MINSTREL_TRUNC(mi->avg_ampdu_len * 10) % 10);
  92         ms->len = p - ms->buf;
  93
  94         return nonseekable_open(inode, file);
  95 }
  96
  97 static const struct file_operations minstrel_ht_stat_fops = {
  98         .owner = THIS_MODULE,
  99         .open = minstrel_ht_stats_open,
 100         .read = minstrel_stats_read,
 101         .release = minstrel_stats_release,
 102         .llseek = no_llseek,
 103 };
 104
 105 void
 106 minstrel_ht_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir)
 107 {
 108         struct minstrel_ht_sta_priv *msp = priv_sta;
 109
 110         msp->dbg_stats = debugfs_create_file("rc_stats", S_IRUGO, dir, msp,
 111                         &minstrel_ht_stat_fops);
 112 }
 113
 114 void
 115 minstrel_ht_remove_sta_debugfs(void *priv, void *priv_sta)
 116 {
 117         struct minstrel_ht_sta_priv *msp = priv_sta;
 118
 119         debugfs_remove(msp->dbg_stats);
 120 }