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_ht.h"
13
14 struct minstrel_debugfs_info {
15 size_t len;
16 char buf[];
17 };
18
19 static ssize_t
minstrel_stats_read(struct file * file,char __user * buf,size_t len,loff_t * ppos)20 minstrel_stats_read(struct file *file, char __user *buf, size_t len, loff_t *ppos)
21 {
22 struct minstrel_debugfs_info *ms;
23
24 ms = file->private_data;
25 return simple_read_from_buffer(buf, len, ppos, ms->buf, ms->len);
26 }
27
28 static int
minstrel_stats_release(struct inode * inode,struct file * file)29 minstrel_stats_release(struct inode *inode, struct file *file)
30 {
31 kfree(file->private_data);
32 return 0;
33 }
34
35 static bool
minstrel_ht_is_sample_rate(struct minstrel_ht_sta * mi,int idx)36 minstrel_ht_is_sample_rate(struct minstrel_ht_sta *mi, int idx)
37 {
38 int type, i;
39
40 for (type = 0; type < ARRAY_SIZE(mi->sample); type++)
41 for (i = 0; i < MINSTREL_SAMPLE_RATES; i++)
42 if (mi->sample[type].cur_sample_rates[i] == idx)
43 return true;
44 return false;
45 }
46
47 static char *
minstrel_ht_stats_dump(struct minstrel_ht_sta * mi,int i,char * p)48 minstrel_ht_stats_dump(struct minstrel_ht_sta *mi, int i, char *p)
49 {
50 const struct mcs_group *mg;
51 unsigned int j, tp_max, tp_avg, eprob, tx_time;
52 char htmode = '2';
53 char gimode = 'L';
54 u32 gflags;
55
56 if (!mi->supported[i])
57 return p;
58
59 mg = &minstrel_mcs_groups[i];
60 gflags = mg->flags;
61
62 if (gflags & IEEE80211_TX_RC_40_MHZ_WIDTH)
63 htmode = '4';
64 else if (gflags & IEEE80211_TX_RC_80_MHZ_WIDTH)
65 htmode = '8';
66 if (gflags & IEEE80211_TX_RC_SHORT_GI)
67 gimode = 'S';
68
69 for (j = 0; j < MCS_GROUP_RATES; j++) {
70 struct minstrel_rate_stats *mrs = &mi->groups[i].rates[j];
71 int idx = MI_RATE(i, j);
72 unsigned int duration;
73
74 if (!(mi->supported[i] & BIT(j)))
75 continue;
76
77 if (gflags & IEEE80211_TX_RC_MCS) {
78 p += sprintf(p, "HT%c0 ", htmode);
79 p += sprintf(p, "%cGI ", gimode);
80 p += sprintf(p, "%d ", mg->streams);
81 } else if (gflags & IEEE80211_TX_RC_VHT_MCS) {
82 p += sprintf(p, "VHT%c0 ", htmode);
83 p += sprintf(p, "%cGI ", gimode);
84 p += sprintf(p, "%d ", mg->streams);
85 } else if (i == MINSTREL_OFDM_GROUP) {
86 p += sprintf(p, "OFDM ");
87 p += sprintf(p, "1 ");
88 } else {
89 p += sprintf(p, "CCK ");
90 p += sprintf(p, "%cP ", j < 4 ? 'L' : 'S');
91 p += sprintf(p, "1 ");
92 }
93
94 *(p++) = (idx == mi->max_tp_rate[0]) ? 'A' : ' ';
95 *(p++) = (idx == mi->max_tp_rate[1]) ? 'B' : ' ';
96 *(p++) = (idx == mi->max_tp_rate[2]) ? 'C' : ' ';
97 *(p++) = (idx == mi->max_tp_rate[3]) ? 'D' : ' ';
98 *(p++) = (idx == mi->max_prob_rate) ? 'P' : ' ';
99 *(p++) = minstrel_ht_is_sample_rate(mi, idx) ? 'S' : ' ';
100
101 if (gflags & IEEE80211_TX_RC_MCS) {
102 p += sprintf(p, " MCS%-2u", (mg->streams - 1) * 8 + j);
103 } else if (gflags & IEEE80211_TX_RC_VHT_MCS) {
104 p += sprintf(p, " MCS%-1u/%1u", j, mg->streams);
105 } else {
106 int r;
107
108 if (i == MINSTREL_OFDM_GROUP)
109 r = minstrel_ofdm_bitrates[j % 8];
110 else
111 r = minstrel_cck_bitrates[j % 4];
112
113 p += sprintf(p, " %2u.%1uM", r / 10, r % 10);
114 }
115
116 p += sprintf(p, " %3u ", idx);
117
118 /* tx_time[rate(i)] in usec */
119 duration = mg->duration[j];
120 duration <<= mg->shift;
121 tx_time = DIV_ROUND_CLOSEST(duration, 1000);
122 p += sprintf(p, "%6u ", tx_time);
123
124 tp_max = minstrel_ht_get_tp_avg(mi, i, j, MINSTREL_FRAC(100, 100));
125 tp_avg = minstrel_ht_get_tp_avg(mi, i, j, mrs->prob_avg);
126 eprob = MINSTREL_TRUNC(mrs->prob_avg * 1000);
127
128 p += sprintf(p, "%4u.%1u %4u.%1u %3u.%1u"
129 " %3u %3u %-3u "
130 "%9llu %-9llu\n",
131 tp_max / 10, tp_max % 10,
132 tp_avg / 10, tp_avg % 10,
133 eprob / 10, eprob % 10,
134 mrs->retry_count,
135 mrs->last_success,
136 mrs->last_attempts,
137 (unsigned long long)mrs->succ_hist,
138 (unsigned long long)mrs->att_hist);
139 }
140
141 return p;
142 }
143
144 static int
minstrel_ht_stats_open(struct inode * inode,struct file * file)145 minstrel_ht_stats_open(struct inode *inode, struct file *file)
146 {
147 struct minstrel_ht_sta *mi = inode->i_private;
148 struct minstrel_debugfs_info *ms;
149 unsigned int i;
150 char *p;
151
152 ms = kmalloc(32768, GFP_KERNEL);
153 if (!ms)
154 return -ENOMEM;
155
156 file->private_data = ms;
157 p = ms->buf;
158
159 p += sprintf(p, "\n");
160 p += sprintf(p,
161 " best ____________rate__________ ____statistics___ _____last____ ______sum-of________\n");
162 p += sprintf(p,
163 "mode guard # rate [name idx airtime max_tp] [avg(tp) avg(prob)] [retry|suc|att] [#success | #attempts]\n");
164
165 p = minstrel_ht_stats_dump(mi, MINSTREL_CCK_GROUP, p);
166 for (i = 0; i < MINSTREL_CCK_GROUP; i++)
167 p = minstrel_ht_stats_dump(mi, i, p);
168 for (i++; i < ARRAY_SIZE(mi->groups); i++)
169 p = minstrel_ht_stats_dump(mi, i, p);
170
171 p += sprintf(p, "\nTotal packet count:: ideal %d "
172 "lookaround %d\n",
173 max(0, (int) mi->total_packets - (int) mi->sample_packets),
174 mi->sample_packets);
175 if (mi->avg_ampdu_len)
176 p += sprintf(p, "Average # of aggregated frames per A-MPDU: %d.%d\n",
177 MINSTREL_TRUNC(mi->avg_ampdu_len),
178 MINSTREL_TRUNC(mi->avg_ampdu_len * 10) % 10);
179 ms->len = p - ms->buf;
180 WARN_ON(ms->len + sizeof(*ms) > 32768);
181
182 return nonseekable_open(inode, file);
183 }
184
185 static const struct file_operations minstrel_ht_stat_fops = {
186 .owner = THIS_MODULE,
187 .open = minstrel_ht_stats_open,
188 .read = minstrel_stats_read,
189 .release = minstrel_stats_release,
190 .llseek = no_llseek,
191 };
192
193 static char *
minstrel_ht_stats_csv_dump(struct minstrel_ht_sta * mi,int i,char * p)194 minstrel_ht_stats_csv_dump(struct minstrel_ht_sta *mi, int i, char *p)
195 {
196 const struct mcs_group *mg;
197 unsigned int j, tp_max, tp_avg, eprob, tx_time;
198 char htmode = '2';
199 char gimode = 'L';
200 u32 gflags;
201
202 if (!mi->supported[i])
203 return p;
204
205 mg = &minstrel_mcs_groups[i];
206 gflags = mg->flags;
207
208 if (gflags & IEEE80211_TX_RC_40_MHZ_WIDTH)
209 htmode = '4';
210 else if (gflags & IEEE80211_TX_RC_80_MHZ_WIDTH)
211 htmode = '8';
212 if (gflags & IEEE80211_TX_RC_SHORT_GI)
213 gimode = 'S';
214
215 for (j = 0; j < MCS_GROUP_RATES; j++) {
216 struct minstrel_rate_stats *mrs = &mi->groups[i].rates[j];
217 int idx = MI_RATE(i, j);
218 unsigned int duration;
219
220 if (!(mi->supported[i] & BIT(j)))
221 continue;
222
223 if (gflags & IEEE80211_TX_RC_MCS) {
224 p += sprintf(p, "HT%c0,", htmode);
225 p += sprintf(p, "%cGI,", gimode);
226 p += sprintf(p, "%d,", mg->streams);
227 } else if (gflags & IEEE80211_TX_RC_VHT_MCS) {
228 p += sprintf(p, "VHT%c0,", htmode);
229 p += sprintf(p, "%cGI,", gimode);
230 p += sprintf(p, "%d,", mg->streams);
231 } else if (i == MINSTREL_OFDM_GROUP) {
232 p += sprintf(p, "OFDM,,1,");
233 } else {
234 p += sprintf(p, "CCK,");
235 p += sprintf(p, "%cP,", j < 4 ? 'L' : 'S');
236 p += sprintf(p, "1,");
237 }
238
239 p += sprintf(p, "%s" ,((idx == mi->max_tp_rate[0]) ? "A" : ""));
240 p += sprintf(p, "%s" ,((idx == mi->max_tp_rate[1]) ? "B" : ""));
241 p += sprintf(p, "%s" ,((idx == mi->max_tp_rate[2]) ? "C" : ""));
242 p += sprintf(p, "%s" ,((idx == mi->max_tp_rate[3]) ? "D" : ""));
243 p += sprintf(p, "%s" ,((idx == mi->max_prob_rate) ? "P" : ""));
244 p += sprintf(p, "%s", (minstrel_ht_is_sample_rate(mi, idx) ? "S" : ""));
245
246 if (gflags & IEEE80211_TX_RC_MCS) {
247 p += sprintf(p, ",MCS%-2u,", (mg->streams - 1) * 8 + j);
248 } else if (gflags & IEEE80211_TX_RC_VHT_MCS) {
249 p += sprintf(p, ",MCS%-1u/%1u,", j, mg->streams);
250 } else {
251 int r;
252
253 if (i == MINSTREL_OFDM_GROUP)
254 r = minstrel_ofdm_bitrates[j % 8];
255 else
256 r = minstrel_cck_bitrates[j % 4];
257
258 p += sprintf(p, ",%2u.%1uM,", r / 10, r % 10);
259 }
260
261 p += sprintf(p, "%u,", idx);
262
263 duration = mg->duration[j];
264 duration <<= mg->shift;
265 tx_time = DIV_ROUND_CLOSEST(duration, 1000);
266 p += sprintf(p, "%u,", tx_time);
267
268 tp_max = minstrel_ht_get_tp_avg(mi, i, j, MINSTREL_FRAC(100, 100));
269 tp_avg = minstrel_ht_get_tp_avg(mi, i, j, mrs->prob_avg);
270 eprob = MINSTREL_TRUNC(mrs->prob_avg * 1000);
271
272 p += sprintf(p, "%u.%u,%u.%u,%u.%u,%u,%u,"
273 "%u,%llu,%llu,",
274 tp_max / 10, tp_max % 10,
275 tp_avg / 10, tp_avg % 10,
276 eprob / 10, eprob % 10,
277 mrs->retry_count,
278 mrs->last_success,
279 mrs->last_attempts,
280 (unsigned long long)mrs->succ_hist,
281 (unsigned long long)mrs->att_hist);
282 p += sprintf(p, "%d,%d,%d.%d\n",
283 max(0, (int) mi->total_packets -
284 (int) mi->sample_packets),
285 mi->sample_packets,
286 MINSTREL_TRUNC(mi->avg_ampdu_len),
287 MINSTREL_TRUNC(mi->avg_ampdu_len * 10) % 10);
288 }
289
290 return p;
291 }
292
293 static int
minstrel_ht_stats_csv_open(struct inode * inode,struct file * file)294 minstrel_ht_stats_csv_open(struct inode *inode, struct file *file)
295 {
296 struct minstrel_ht_sta *mi = inode->i_private;
297 struct minstrel_debugfs_info *ms;
298 unsigned int i;
299 char *p;
300
301 ms = kmalloc(32768, GFP_KERNEL);
302 if (!ms)
303 return -ENOMEM;
304
305 file->private_data = ms;
306
307 p = ms->buf;
308
309 p = minstrel_ht_stats_csv_dump(mi, MINSTREL_CCK_GROUP, p);
310 for (i = 0; i < MINSTREL_CCK_GROUP; i++)
311 p = minstrel_ht_stats_csv_dump(mi, i, p);
312 for (i++; i < ARRAY_SIZE(mi->groups); i++)
313 p = minstrel_ht_stats_csv_dump(mi, i, p);
314
315 ms->len = p - ms->buf;
316 WARN_ON(ms->len + sizeof(*ms) > 32768);
317
318 return nonseekable_open(inode, file);
319 }
320
321 static const struct file_operations minstrel_ht_stat_csv_fops = {
322 .owner = THIS_MODULE,
323 .open = minstrel_ht_stats_csv_open,
324 .read = minstrel_stats_read,
325 .release = minstrel_stats_release,
326 .llseek = no_llseek,
327 };
328
329 void
minstrel_ht_add_sta_debugfs(void * priv,void * priv_sta,struct dentry * dir)330 minstrel_ht_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir)
331 {
332 debugfs_create_file("rc_stats", 0444, dir, priv_sta,
333 &minstrel_ht_stat_fops);
334 debugfs_create_file("rc_stats_csv", 0444, dir, priv_sta,
335 &minstrel_ht_stat_csv_fops);
336 }
337