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 }
121