Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wirel...
[linux-2.6.git] / 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 }