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
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
29 minstrel_stats_release(struct inode *inode, struct file *file)
30 {
31 	kfree(file->private_data);
32 	return 0;
33 }
34 
35 static bool
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 *
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
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 *
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
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
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