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         unsigned int max_mcs = MINSTREL_MAX_STREAMS * MINSTREL_STREAM_GROUPS;
  22         const struct mcs_group *mg;
  23         unsigned int j, tp, prob, eprob;
  24         char htmode = '2';
  25         char gimode = 'L';
  26
  27         if (!mi->groups[i].supported)
  28                 return p;
  29
  30         mg = &minstrel_mcs_groups[i];
  31         if (mg->flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
  32                 htmode = '4';
  33         if (mg->flags & IEEE80211_TX_RC_SHORT_GI)
  34                 gimode = 'S';
  35
  36         for (j = 0; j < MCS_GROUP_RATES; j++) {
  37                 struct minstrel_rate_stats *mr = &mi->groups[i].rates[j];
  38                 static const int bitrates[4] = { 10, 20, 55, 110 };
  39                 int idx = i * MCS_GROUP_RATES + j;
  40
  41                 if (!(mi->groups[i].supported & BIT(j)))
  42                         continue;
  43
  44                 if (i == max_mcs)
  45                         p += sprintf(p, "CCK/%cP   ", j < 4 ? 'L' : 'S');
  46                 else
  47                         p += sprintf(p, "HT%c0/%cGI ", htmode, gimode);
  48
  49                 *(p++) = (idx == mi->max_tp_rate) ? 'T' : ' ';
  50                 *(p++) = (idx == mi->max_tp_rate2) ? 't' : ' ';
  51                 *(p++) = (idx == mi->max_prob_rate) ? 'P' : ' ';
  52
  53                 if (i == max_mcs) {
  54                         int r = bitrates[j % 4];
  55                         p += sprintf(p, " %2u.%1uM", r / 10, r % 10);
  56                 } else {
  57                         p += sprintf(p, " MCS%-2u", (mg->streams - 1) *
  58                                          MCS_GROUP_RATES + j);
  59                 }
  60
  61                 tp = mr->cur_tp / 10;
  62                 prob = MINSTREL_TRUNC(mr->cur_prob * 1000);
  63                 eprob = MINSTREL_TRUNC(mr->probability * 1000);
  64
  65                 p += sprintf(p, "      %6u.%1u   %6u.%1u    %6u.%1u    "
  66                                 "%3u            %3u(%3u)  %8llu    %8llu\n",
  67                                 tp / 10, tp % 10,
  68                                 eprob / 10, eprob % 10,
  69                                 prob / 10, prob % 10,
  70                                 mr->retry_count,
  71                                 mr->last_success,
  72                                 mr->last_attempts,
  73                                 (unsigned long long)mr->succ_hist,
  74                                 (unsigned long long)mr->att_hist);
  75         }
  76
  77         return p;
  78 }
  79
  80 static int
  81 minstrel_ht_stats_open(struct inode *inode, struct file *file)
  82 {
  83         struct minstrel_ht_sta_priv *msp = inode->i_private;
  84         struct minstrel_ht_sta *mi = &msp->ht;
  85         struct minstrel_debugfs_info *ms;
  86         unsigned int i;
  87         unsigned int max_mcs = MINSTREL_MAX_STREAMS * MINSTREL_STREAM_GROUPS;
  88         char *p;
  89         int ret;
  90
  91         if (!msp->is_ht) {
  92                 inode->i_private = &msp->legacy;
  93                 ret = minstrel_stats_open(inode, file);
  94                 inode->i_private = msp;
  95                 return ret;
  96         }
  97
  98         ms = kmalloc(sizeof(*ms) + 8192, GFP_KERNEL);
  99         if (!ms)
 100                 return -ENOMEM;
 101
 102         file->private_data = ms;
 103         p = ms->buf;
 104         p += sprintf(p, "type         rate     throughput  ewma prob   this prob  "
 105                         "retry   this succ/attempt   success    attempts\n");
 106
 107         p = minstrel_ht_stats_dump(mi, max_mcs, p);
 108         for (i = 0; i < max_mcs; i++)
 109                 p = minstrel_ht_stats_dump(mi, i, p);
 110
 111         p += sprintf(p, "\nTotal packet count::    ideal %d      "
 112                         "lookaround %d\n",
 113                         max(0, (int) mi->total_packets - (int) mi->sample_packets),
 114                         mi->sample_packets);
 115         p += sprintf(p, "Average A-MPDU length: %d.%d\n",
 116                 MINSTREL_TRUNC(mi->avg_ampdu_len),
 117                 MINSTREL_TRUNC(mi->avg_ampdu_len * 10) % 10);
 118         ms->len = p - ms->buf;
 119
 120         return nonseekable_open(inode, file);
 121 }
 122
 123 static const struct file_operations minstrel_ht_stat_fops = {
 124         .owner = THIS_MODULE,
 125         .open = minstrel_ht_stats_open,
 126         .read = minstrel_stats_read,
 127         .release = minstrel_stats_release,
 128         .llseek = no_llseek,
 129 };
 130
 131 void
 132 minstrel_ht_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir)
 133 {
 134         struct minstrel_ht_sta_priv *msp = priv_sta;
 135
 136         msp->dbg_stats = debugfs_create_file("rc_stats", S_IRUGO, dir, msp,
 137                         &minstrel_ht_stat_fops);
 138 }
 139
 140 void
 141 minstrel_ht_remove_sta_debugfs(void *priv, void *priv_sta)
 142 {
 143         struct minstrel_ht_sta_priv *msp = priv_sta;
 144
 145         debugfs_remove(msp->dbg_stats);
 146 }