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
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
25 minstrel_stats_release(struct inode *inode, struct file *file)
26 {
27 	kfree(file->private_data);
28 	return 0;
29 }
30 
31 static char *
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_ewma);
102 		eprob = MINSTREL_TRUNC(mrs->prob_ewma * 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
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 *
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_ewma);
247 		eprob = MINSTREL_TRUNC(mrs->prob_ewma * 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
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
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