1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2010 Felix Fietkau <nbd@openwrt.org>
4 */
5 #include <linux/netdevice.h>
6 #include <linux/types.h>
7 #include <linux/skbuff.h>
8 #include <linux/debugfs.h>
9 #include <linux/ieee80211.h>
10 #include <linux/export.h>
11 #include <net/mac80211.h>
12 #include "rc80211_minstrel.h"
13 #include "rc80211_minstrel_ht.h"
14
15 static ssize_t
minstrel_stats_read(struct file * file,char __user * buf,size_t len,loff_t * ppos)16 minstrel_stats_read(struct file *file, char __user *buf, size_t len, loff_t *ppos)
17 {
18 struct minstrel_debugfs_info *ms;
19
20 ms = file->private_data;
21 return simple_read_from_buffer(buf, len, ppos, ms->buf, ms->len);
22 }
23
24 static int
minstrel_stats_release(struct inode * inode,struct file * file)25 minstrel_stats_release(struct inode *inode, struct file *file)
26 {
27 kfree(file->private_data);
28 return 0;
29 }
30
31 static char *
minstrel_ht_stats_dump(struct minstrel_ht_sta * mi,int i,char * p)32 minstrel_ht_stats_dump(struct minstrel_ht_sta *mi, int i, char *p)
33 {
34 const struct mcs_group *mg;
35 unsigned int j, tp_max, tp_avg, eprob, tx_time;
36 char htmode = '2';
37 char gimode = 'L';
38 u32 gflags;
39
40 if (!mi->supported[i])
41 return p;
42
43 mg = &minstrel_mcs_groups[i];
44 gflags = mg->flags;
45
46 if (gflags & IEEE80211_TX_RC_40_MHZ_WIDTH)
47 htmode = '4';
48 else if (gflags & IEEE80211_TX_RC_80_MHZ_WIDTH)
49 htmode = '8';
50 if (gflags & IEEE80211_TX_RC_SHORT_GI)
51 gimode = 'S';
52
53 for (j = 0; j < MCS_GROUP_RATES; j++) {
54 struct minstrel_rate_stats *mrs = &mi->groups[i].rates[j];
55 static const int bitrates[4] = { 10, 20, 55, 110 };
56 int idx = i * MCS_GROUP_RATES + j;
57 unsigned int duration;
58
59 if (!(mi->supported[i] & BIT(j)))
60 continue;
61
62 if (gflags & IEEE80211_TX_RC_MCS) {
63 p += sprintf(p, "HT%c0 ", htmode);
64 p += sprintf(p, "%cGI ", gimode);
65 p += sprintf(p, "%d ", mg->streams);
66 } else if (gflags & IEEE80211_TX_RC_VHT_MCS) {
67 p += sprintf(p, "VHT%c0 ", htmode);
68 p += sprintf(p, "%cGI ", gimode);
69 p += sprintf(p, "%d ", mg->streams);
70 } else {
71 p += sprintf(p, "CCK ");
72 p += sprintf(p, "%cP ", j < 4 ? 'L' : 'S');
73 p += sprintf(p, "1 ");
74 }
75
76 *(p++) = (idx == mi->max_tp_rate[0]) ? 'A' : ' ';
77 *(p++) = (idx == mi->max_tp_rate[1]) ? 'B' : ' ';
78 *(p++) = (idx == mi->max_tp_rate[2]) ? 'C' : ' ';
79 *(p++) = (idx == mi->max_tp_rate[3]) ? 'D' : ' ';
80 *(p++) = (idx == mi->max_prob_rate) ? 'P' : ' ';
81
82 if (gflags & IEEE80211_TX_RC_MCS) {
83 p += sprintf(p, " MCS%-2u", (mg->streams - 1) * 8 + j);
84 } else if (gflags & IEEE80211_TX_RC_VHT_MCS) {
85 p += sprintf(p, " MCS%-1u/%1u", j, mg->streams);
86 } else {
87 int r = bitrates[j % 4];
88
89 p += sprintf(p, " %2u.%1uM", r / 10, r % 10);
90 }
91
92 p += sprintf(p, " %3u ", idx);
93
94 /* tx_time[rate(i)] in usec */
95 duration = mg->duration[j];
96 duration <<= mg->shift;
97 tx_time = DIV_ROUND_CLOSEST(duration, 1000);
98 p += sprintf(p, "%6u ", tx_time);
99
100 tp_max = minstrel_ht_get_tp_avg(mi, i, j, MINSTREL_FRAC(100, 100));
101 tp_avg = minstrel_ht_get_tp_avg(mi, i, j, mrs->prob_avg);
102 eprob = MINSTREL_TRUNC(mrs->prob_avg * 1000);
103
104 p += sprintf(p, "%4u.%1u %4u.%1u %3u.%1u"
105 " %3u %3u %-3u "
106 "%9llu %-9llu\n",
107 tp_max / 10, tp_max % 10,
108 tp_avg / 10, tp_avg % 10,
109 eprob / 10, eprob % 10,
110 mrs->retry_count,
111 mrs->last_success,
112 mrs->last_attempts,
113 (unsigned long long)mrs->succ_hist,
114 (unsigned long long)mrs->att_hist);
115 }
116
117 return p;
118 }
119
120 static int
minstrel_ht_stats_open(struct inode * inode,struct file * file)121 minstrel_ht_stats_open(struct inode *inode, struct file *file)
122 {
123 struct minstrel_ht_sta_priv *msp = inode->i_private;
124 struct minstrel_ht_sta *mi = &msp->ht;
125 struct minstrel_debugfs_info *ms;
126 unsigned int i;
127 int ret;
128 char *p;
129
130 if (!msp->is_ht) {
131 inode->i_private = &msp->legacy;
132 ret = minstrel_stats_open(inode, file);
133 inode->i_private = msp;
134 return ret;
135 }
136
137 ms = kmalloc(32768, GFP_KERNEL);
138 if (!ms)
139 return -ENOMEM;
140
141 file->private_data = ms;
142 p = ms->buf;
143
144 p += sprintf(p, "\n");
145 p += sprintf(p,
146 " best ____________rate__________ ____statistics___ _____last____ ______sum-of________\n");
147 p += sprintf(p,
148 "mode guard # rate [name idx airtime max_tp] [avg(tp) avg(prob)] [retry|suc|att] [#success | #attempts]\n");
149
150 p = minstrel_ht_stats_dump(mi, MINSTREL_CCK_GROUP, p);
151 for (i = 0; i < MINSTREL_CCK_GROUP; i++)
152 p = minstrel_ht_stats_dump(mi, i, p);
153 for (i++; i < ARRAY_SIZE(mi->groups); i++)
154 p = minstrel_ht_stats_dump(mi, i, p);
155
156 p += sprintf(p, "\nTotal packet count:: ideal %d "
157 "lookaround %d\n",
158 max(0, (int) mi->total_packets - (int) mi->sample_packets),
159 mi->sample_packets);
160 if (mi->avg_ampdu_len)
161 p += sprintf(p, "Average # of aggregated frames per A-MPDU: %d.%d\n",
162 MINSTREL_TRUNC(mi->avg_ampdu_len),
163 MINSTREL_TRUNC(mi->avg_ampdu_len * 10) % 10);
164 ms->len = p - ms->buf;
165 WARN_ON(ms->len + sizeof(*ms) > 32768);
166
167 return nonseekable_open(inode, file);
168 }
169
170 static const struct file_operations minstrel_ht_stat_fops = {
171 .owner = THIS_MODULE,
172 .open = minstrel_ht_stats_open,
173 .read = minstrel_stats_read,
174 .release = minstrel_stats_release,
175 .llseek = no_llseek,
176 };
177
178 static char *
minstrel_ht_stats_csv_dump(struct minstrel_ht_sta * mi,int i,char * p)179 minstrel_ht_stats_csv_dump(struct minstrel_ht_sta *mi, int i, char *p)
180 {
181 const struct mcs_group *mg;
182 unsigned int j, tp_max, tp_avg, eprob, tx_time;
183 char htmode = '2';
184 char gimode = 'L';
185 u32 gflags;
186
187 if (!mi->supported[i])
188 return p;
189
190 mg = &minstrel_mcs_groups[i];
191 gflags = mg->flags;
192
193 if (gflags & IEEE80211_TX_RC_40_MHZ_WIDTH)
194 htmode = '4';
195 else if (gflags & IEEE80211_TX_RC_80_MHZ_WIDTH)
196 htmode = '8';
197 if (gflags & IEEE80211_TX_RC_SHORT_GI)
198 gimode = 'S';
199
200 for (j = 0; j < MCS_GROUP_RATES; j++) {
201 struct minstrel_rate_stats *mrs = &mi->groups[i].rates[j];
202 static const int bitrates[4] = { 10, 20, 55, 110 };
203 int idx = i * MCS_GROUP_RATES + j;
204 unsigned int duration;
205
206 if (!(mi->supported[i] & BIT(j)))
207 continue;
208
209 if (gflags & IEEE80211_TX_RC_MCS) {
210 p += sprintf(p, "HT%c0,", htmode);
211 p += sprintf(p, "%cGI,", gimode);
212 p += sprintf(p, "%d,", mg->streams);
213 } else if (gflags & IEEE80211_TX_RC_VHT_MCS) {
214 p += sprintf(p, "VHT%c0,", htmode);
215 p += sprintf(p, "%cGI,", gimode);
216 p += sprintf(p, "%d,", mg->streams);
217 } else {
218 p += sprintf(p, "CCK,");
219 p += sprintf(p, "%cP,", j < 4 ? 'L' : 'S');
220 p += sprintf(p, "1,");
221 }
222
223 p += sprintf(p, "%s" ,((idx == mi->max_tp_rate[0]) ? "A" : ""));
224 p += sprintf(p, "%s" ,((idx == mi->max_tp_rate[1]) ? "B" : ""));
225 p += sprintf(p, "%s" ,((idx == mi->max_tp_rate[2]) ? "C" : ""));
226 p += sprintf(p, "%s" ,((idx == mi->max_tp_rate[3]) ? "D" : ""));
227 p += sprintf(p, "%s" ,((idx == mi->max_prob_rate) ? "P" : ""));
228
229 if (gflags & IEEE80211_TX_RC_MCS) {
230 p += sprintf(p, ",MCS%-2u,", (mg->streams - 1) * 8 + j);
231 } else if (gflags & IEEE80211_TX_RC_VHT_MCS) {
232 p += sprintf(p, ",MCS%-1u/%1u,", j, mg->streams);
233 } else {
234 int r = bitrates[j % 4];
235 p += sprintf(p, ",%2u.%1uM,", r / 10, r % 10);
236 }
237
238 p += sprintf(p, "%u,", idx);
239
240 duration = mg->duration[j];
241 duration <<= mg->shift;
242 tx_time = DIV_ROUND_CLOSEST(duration, 1000);
243 p += sprintf(p, "%u,", tx_time);
244
245 tp_max = minstrel_ht_get_tp_avg(mi, i, j, MINSTREL_FRAC(100, 100));
246 tp_avg = minstrel_ht_get_tp_avg(mi, i, j, mrs->prob_avg);
247 eprob = MINSTREL_TRUNC(mrs->prob_avg * 1000);
248
249 p += sprintf(p, "%u.%u,%u.%u,%u.%u,%u,%u,"
250 "%u,%llu,%llu,",
251 tp_max / 10, tp_max % 10,
252 tp_avg / 10, tp_avg % 10,
253 eprob / 10, eprob % 10,
254 mrs->retry_count,
255 mrs->last_success,
256 mrs->last_attempts,
257 (unsigned long long)mrs->succ_hist,
258 (unsigned long long)mrs->att_hist);
259 p += sprintf(p, "%d,%d,%d.%d\n",
260 max(0, (int) mi->total_packets -
261 (int) mi->sample_packets),
262 mi->sample_packets,
263 MINSTREL_TRUNC(mi->avg_ampdu_len),
264 MINSTREL_TRUNC(mi->avg_ampdu_len * 10) % 10);
265 }
266
267 return p;
268 }
269
270 static int
minstrel_ht_stats_csv_open(struct inode * inode,struct file * file)271 minstrel_ht_stats_csv_open(struct inode *inode, struct file *file)
272 {
273 struct minstrel_ht_sta_priv *msp = inode->i_private;
274 struct minstrel_ht_sta *mi = &msp->ht;
275 struct minstrel_debugfs_info *ms;
276 unsigned int i;
277 int ret;
278 char *p;
279
280 if (!msp->is_ht) {
281 inode->i_private = &msp->legacy;
282 ret = minstrel_stats_csv_open(inode, file);
283 inode->i_private = msp;
284 return ret;
285 }
286
287 ms = kmalloc(32768, GFP_KERNEL);
288
289 if (!ms)
290 return -ENOMEM;
291
292 file->private_data = ms;
293
294 p = ms->buf;
295
296 p = minstrel_ht_stats_csv_dump(mi, MINSTREL_CCK_GROUP, p);
297 for (i = 0; i < MINSTREL_CCK_GROUP; i++)
298 p = minstrel_ht_stats_csv_dump(mi, i, p);
299 for (i++; i < ARRAY_SIZE(mi->groups); i++)
300 p = minstrel_ht_stats_csv_dump(mi, i, p);
301
302 ms->len = p - ms->buf;
303 WARN_ON(ms->len + sizeof(*ms) > 32768);
304
305 return nonseekable_open(inode, file);
306 }
307
308 static const struct file_operations minstrel_ht_stat_csv_fops = {
309 .owner = THIS_MODULE,
310 .open = minstrel_ht_stats_csv_open,
311 .read = minstrel_stats_read,
312 .release = minstrel_stats_release,
313 .llseek = no_llseek,
314 };
315
316 void
minstrel_ht_add_sta_debugfs(void * priv,void * priv_sta,struct dentry * dir)317 minstrel_ht_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir)
318 {
319 struct minstrel_ht_sta_priv *msp = priv_sta;
320
321 debugfs_create_file("rc_stats", 0444, dir, msp,
322 &minstrel_ht_stat_fops);
323 debugfs_create_file("rc_stats_csv", 0444, dir, msp,
324 &minstrel_ht_stat_csv_fops);
325 }
326
