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
minstrel_ht_stats_open(struct inode * inode,struct file * file)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 nonseekable_open(inode, file);
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 .llseek = no_llseek,
102 };
103
104 void
minstrel_ht_add_sta_debugfs(void * priv,void * priv_sta,struct dentry * dir)105 minstrel_ht_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir)
106 {
107 struct minstrel_ht_sta_priv *msp = priv_sta;
108
109 msp->dbg_stats = debugfs_create_file("rc_stats", S_IRUGO, dir, msp,
110 &minstrel_ht_stat_fops);
111 }
112
113 void
minstrel_ht_remove_sta_debugfs(void * priv,void * priv_sta)114 minstrel_ht_remove_sta_debugfs(void *priv, void *priv_sta)
115 {
116 struct minstrel_ht_sta_priv *msp = priv_sta;
117
118 debugfs_remove(msp->dbg_stats);
119 }
120