rc80211_minstrel_ht_debugfs.c

  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
 14struct minstrel_debugfs_info {
 15	size_t len;
 16	char buf[];
 17};
 18
 19static ssize_t
 20minstrel_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
 28static int
 29minstrel_stats_release(struct inode *inode, struct file *file)
 30{
 31	kfree(file->private_data);
 32	return 0;
 33}
 34
 35static bool
 36minstrel_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
 47static char *
 48minstrel_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
144static int
145minstrel_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
185static 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};
191
192static char *
193minstrel_ht_stats_csv_dump(struct minstrel_ht_sta *mi, int i, char *p)
194{
195	const struct mcs_group *mg;
196	unsigned int j, tp_max, tp_avg, eprob, tx_time;
197	char htmode = '2';
198	char gimode = 'L';
199	u32 gflags;
200
201	if (!mi->supported[i])
202		return p;
203
204	mg = &minstrel_mcs_groups[i];
205	gflags = mg->flags;
206
207	if (gflags & IEEE80211_TX_RC_40_MHZ_WIDTH)
208		htmode = '4';
209	else if (gflags & IEEE80211_TX_RC_80_MHZ_WIDTH)
210		htmode = '8';
211	if (gflags & IEEE80211_TX_RC_SHORT_GI)
212		gimode = 'S';
213
214	for (j = 0; j < MCS_GROUP_RATES; j++) {
215		struct minstrel_rate_stats *mrs = &mi->groups[i].rates[j];
216		int idx = MI_RATE(i, j);
217		unsigned int duration;
218
219		if (!(mi->supported[i] & BIT(j)))
220			continue;
221
222		if (gflags & IEEE80211_TX_RC_MCS) {
223			p += sprintf(p, "HT%c0,", htmode);
224			p += sprintf(p, "%cGI,", gimode);
225			p += sprintf(p, "%d,", mg->streams);
226		} else if (gflags & IEEE80211_TX_RC_VHT_MCS) {
227			p += sprintf(p, "VHT%c0,", htmode);
228			p += sprintf(p, "%cGI,", gimode);
229			p += sprintf(p, "%d,", mg->streams);
230		} else if (i == MINSTREL_OFDM_GROUP) {
231			p += sprintf(p, "OFDM,,1,");
232		} else {
233			p += sprintf(p, "CCK,");
234			p += sprintf(p, "%cP,", j < 4 ? 'L' : 'S');
235			p += sprintf(p, "1,");
236		}
237
238		p += sprintf(p, "%s" ,((idx == mi->max_tp_rate[0]) ? "A" : ""));
239		p += sprintf(p, "%s" ,((idx == mi->max_tp_rate[1]) ? "B" : ""));
240		p += sprintf(p, "%s" ,((idx == mi->max_tp_rate[2]) ? "C" : ""));
241		p += sprintf(p, "%s" ,((idx == mi->max_tp_rate[3]) ? "D" : ""));
242		p += sprintf(p, "%s" ,((idx == mi->max_prob_rate) ? "P" : ""));
243		p += sprintf(p, "%s", (minstrel_ht_is_sample_rate(mi, idx) ? "S" : ""));
244
245		if (gflags & IEEE80211_TX_RC_MCS) {
246			p += sprintf(p, ",MCS%-2u,", (mg->streams - 1) * 8 + j);
247		} else if (gflags & IEEE80211_TX_RC_VHT_MCS) {
248			p += sprintf(p, ",MCS%-1u/%1u,", j, mg->streams);
249		} else {
250			int r;
251
252			if (i == MINSTREL_OFDM_GROUP)
253				r = minstrel_ofdm_bitrates[j % 8];
254			else
255				r = minstrel_cck_bitrates[j % 4];
256
257			p += sprintf(p, ",%2u.%1uM,", r / 10, r % 10);
258		}
259
260		p += sprintf(p, "%u,", idx);
261
262		duration = mg->duration[j];
263		duration <<= mg->shift;
264		tx_time = DIV_ROUND_CLOSEST(duration, 1000);
265		p += sprintf(p, "%u,", tx_time);
266
267		tp_max = minstrel_ht_get_tp_avg(mi, i, j, MINSTREL_FRAC(100, 100));
268		tp_avg = minstrel_ht_get_tp_avg(mi, i, j, mrs->prob_avg);
269		eprob = MINSTREL_TRUNC(mrs->prob_avg * 1000);
270
271		p += sprintf(p, "%u.%u,%u.%u,%u.%u,%u,%u,"
272				"%u,%llu,%llu,",
273				tp_max / 10, tp_max % 10,
274				tp_avg / 10, tp_avg % 10,
275				eprob / 10, eprob % 10,
276				mrs->retry_count,
277				mrs->last_success,
278				mrs->last_attempts,
279				(unsigned long long)mrs->succ_hist,
280				(unsigned long long)mrs->att_hist);
281		p += sprintf(p, "%d,%d,%d.%d\n",
282				max(0, (int) mi->total_packets -
283				(int) mi->sample_packets),
284				mi->sample_packets,
285				MINSTREL_TRUNC(mi->avg_ampdu_len),
286				MINSTREL_TRUNC(mi->avg_ampdu_len * 10) % 10);
287	}
288
289	return p;
290}
291
292static int
293minstrel_ht_stats_csv_open(struct inode *inode, struct file *file)
294{
295	struct minstrel_ht_sta *mi = inode->i_private;
296	struct minstrel_debugfs_info *ms;
297	unsigned int i;
298	char *p;
299
300	ms = kmalloc(32768, GFP_KERNEL);
301	if (!ms)
302		return -ENOMEM;
303
304	file->private_data = ms;
305
306	p = ms->buf;
307
308	p = minstrel_ht_stats_csv_dump(mi, MINSTREL_CCK_GROUP, p);
309	for (i = 0; i < MINSTREL_CCK_GROUP; i++)
310		p = minstrel_ht_stats_csv_dump(mi, i, p);
311	for (i++; i < ARRAY_SIZE(mi->groups); i++)
312		p = minstrel_ht_stats_csv_dump(mi, i, p);
313
314	ms->len = p - ms->buf;
315	WARN_ON(ms->len + sizeof(*ms) > 32768);
316
317	return nonseekable_open(inode, file);
318}
319
320static const struct file_operations minstrel_ht_stat_csv_fops = {
321	.owner = THIS_MODULE,
322	.open = minstrel_ht_stats_csv_open,
323	.read = minstrel_stats_read,
324	.release = minstrel_stats_release,
325};
326
327void
328minstrel_ht_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir)
329{
330	debugfs_create_file("rc_stats", 0444, dir, priv_sta,
331			    &minstrel_ht_stat_fops);
332	debugfs_create_file("rc_stats_csv", 0444, dir, priv_sta,
333			    &minstrel_ht_stat_csv_fops);
334}