linux/net/mac80211/rc80211_minstrel_ht_debugfs.c
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   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
  18static int
  19minstrel_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
  97static 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
 105void
 106minstrel_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
 114void
 115minstrel_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}
 121
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