net/mac80211/rc80211_minstrel_ht_debugfs.c - kernel/msm-4.19 - Gitiles

 /*
  * Copyright (C) 2010 Felix Fietkau <nbd@openwrt.org>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */
 #include <linux/netdevice.h>
 #include <linux/types.h>
 #include <linux/skbuff.h>
 #include <linux/debugfs.h>
 #include <linux/ieee80211.h>
 #include <linux/export.h>
 #include <net/mac80211.h>
 #include "rc80211_minstrel.h"
 #include "rc80211_minstrel_ht.h"

 static char *
 minstrel_ht_stats_dump(struct minstrel_ht_sta *mi, int i, char *p)
 {
 	const struct mcs_group *mg;
 	unsigned int j, tp_max, tp_avg, eprob, tx_time;
 	char htmode = '2';
 	char gimode = 'L';
 	u32 gflags;

 	if (!mi->supported[i])
 		return p;

 	mg = &minstrel_mcs_groups[i];
 	gflags = mg->flags;

 	if (gflags & IEEE80211_TX_RC_40_MHZ_WIDTH)
 		htmode = '4';
 	else if (gflags & IEEE80211_TX_RC_80_MHZ_WIDTH)
 		htmode = '8';
 	if (gflags & IEEE80211_TX_RC_SHORT_GI)
 		gimode = 'S';

 	for (j = 0; j < MCS_GROUP_RATES; j++) {
 		struct minstrel_rate_stats *mrs = &mi->groups[i].rates[j];
 		static const int bitrates[4] = { 10, 20, 55, 110 };
 		int idx = i * MCS_GROUP_RATES + j;
 		unsigned int prob_ewmsd;

 		if (!(mi->supported[i] & BIT(j)))
 			continue;

 		if (gflags & IEEE80211_TX_RC_MCS) {
 			p += sprintf(p, "HT%c0  ", htmode);
 			p += sprintf(p, "%cGI  ", gimode);
 			p += sprintf(p, "%d  ", mg->streams);
 		} else if (gflags & IEEE80211_TX_RC_VHT_MCS) {
 			p += sprintf(p, "VHT%c0 ", htmode);
 			p += sprintf(p, "%cGI ", gimode);
 			p += sprintf(p, "%d  ", mg->streams);
 		} else {
 			p += sprintf(p, "CCK    ");
 			p += sprintf(p, "%cP  ", j < 4 ? 'L' : 'S');
 			p += sprintf(p, "1 ");
 		}

 		*(p++) = (idx == mi->max_tp_rate[0]) ? 'A' : ' ';
 		*(p++) = (idx == mi->max_tp_rate[1]) ? 'B' : ' ';
 		*(p++) = (idx == mi->max_tp_rate[2]) ? 'C' : ' ';
 		*(p++) = (idx == mi->max_tp_rate[3]) ? 'D' : ' ';
 		*(p++) = (idx == mi->max_prob_rate) ? 'P' : ' ';

 		if (gflags & IEEE80211_TX_RC_MCS) {
 			p += sprintf(p, "  MCS%-2u", (mg->streams - 1) * 8 + j);
 		} else if (gflags & IEEE80211_TX_RC_VHT_MCS) {
 			p += sprintf(p, "  MCS%-1u/%1u", j, mg->streams);
 		} else {
 			int r = bitrates[j % 4];

 			p += sprintf(p, "   %2u.%1uM", r / 10, r % 10);
 		}

 		p += sprintf(p, "  %3u  ", idx);

 		/* tx_time[rate(i)] in usec */
 		tx_time = DIV_ROUND_CLOSEST(mg->duration[j], 1000);
 		p += sprintf(p, "%6u  ", tx_time);

 		tp_max = minstrel_ht_get_tp_avg(mi, i, j, MINSTREL_FRAC(100, 100));
 		tp_avg = minstrel_ht_get_tp_avg(mi, i, j, mrs->prob_ewma);
 		eprob = MINSTREL_TRUNC(mrs->prob_ewma * 1000);
 		prob_ewmsd = minstrel_get_ewmsd10(mrs);

 		p += sprintf(p, "%4u.%1u    %4u.%1u     %3u.%1u    %3u.%1u"
 				"     %3u   %3u %-3u   "
 				"%9llu   %-9llu\n",
 				tp_max / 10, tp_max % 10,
 				tp_avg / 10, tp_avg % 10,
 				eprob / 10, eprob % 10,
 				prob_ewmsd / 10, prob_ewmsd % 10,
 				mrs->retry_count,
 				mrs->last_success,
 				mrs->last_attempts,
 				(unsigned long long)mrs->succ_hist,
 				(unsigned long long)mrs->att_hist);
 	}

 	return p;
 }

 static int
 minstrel_ht_stats_open(struct inode *inode, struct file *file)
 {
 	struct minstrel_ht_sta_priv *msp = inode->i_private;
 	struct minstrel_ht_sta *mi = &msp->ht;
 	struct minstrel_debugfs_info *ms;
 	unsigned int i;
 	int ret;
 	char *p;

 	if (!msp->is_ht) {
 		inode->i_private = &msp->legacy;
 		ret = minstrel_stats_open(inode, file);
 		inode->i_private = msp;
 		return ret;
 	}

 	ms = kmalloc(32768, GFP_KERNEL);
 	if (!ms)
 		return -ENOMEM;

 	file->private_data = ms;
 	p = ms->buf;

 	p += sprintf(p, "\n");
 	p += sprintf(p,
 		     "              best   ____________rate__________    ________statistics________    _____last____    ______sum-of________\n");
 	p += sprintf(p,
 		     "mode guard #  rate  [name   idx airtime  max_tp]  [avg(tp) avg(prob) sd(prob)]  [retry|suc|att]  [#success | #attempts]\n");

 	p = minstrel_ht_stats_dump(mi, MINSTREL_CCK_GROUP, p);
 	for (i = 0; i < MINSTREL_CCK_GROUP; i++)
 		p = minstrel_ht_stats_dump(mi, i, p);
 	for (i++; i < ARRAY_SIZE(mi->groups); i++)
 		p = minstrel_ht_stats_dump(mi, i, p);

 	p += sprintf(p, "\nTotal packet count::    ideal %d      "
 			"lookaround %d\n",
 			max(0, (int) mi->total_packets - (int) mi->sample_packets),
 			mi->sample_packets);
 	p += sprintf(p, "Average # of aggregated frames per A-MPDU: %d.%d\n",
 		MINSTREL_TRUNC(mi->avg_ampdu_len),
 		MINSTREL_TRUNC(mi->avg_ampdu_len * 10) % 10);
 	ms->len = p - ms->buf;
 	WARN_ON(ms->len + sizeof(*ms) > 32768);

 	return nonseekable_open(inode, file);
 }

 static const struct file_operations minstrel_ht_stat_fops = {
 	.owner = THIS_MODULE,
 	.open = minstrel_ht_stats_open,
 	.read = minstrel_stats_read,
 	.release = minstrel_stats_release,
 	.llseek = no_llseek,
 };

 static char *
 minstrel_ht_stats_csv_dump(struct minstrel_ht_sta *mi, int i, char *p)
 {
 	const struct mcs_group *mg;
 	unsigned int j, tp_max, tp_avg, eprob, tx_time;
 	char htmode = '2';
 	char gimode = 'L';
 	u32 gflags;

 	if (!mi->supported[i])
 		return p;

 	mg = &minstrel_mcs_groups[i];
 	gflags = mg->flags;

 	if (gflags & IEEE80211_TX_RC_40_MHZ_WIDTH)
 		htmode = '4';
 	else if (gflags & IEEE80211_TX_RC_80_MHZ_WIDTH)
 		htmode = '8';
 	if (gflags & IEEE80211_TX_RC_SHORT_GI)
 		gimode = 'S';

 	for (j = 0; j < MCS_GROUP_RATES; j++) {
 		struct minstrel_rate_stats *mrs = &mi->groups[i].rates[j];
 		static const int bitrates[4] = { 10, 20, 55, 110 };
 		int idx = i * MCS_GROUP_RATES + j;
 		unsigned int prob_ewmsd;

 		if (!(mi->supported[i] & BIT(j)))
 			continue;

 		if (gflags & IEEE80211_TX_RC_MCS) {
 			p += sprintf(p, "HT%c0,", htmode);
 			p += sprintf(p, "%cGI,", gimode);
 			p += sprintf(p, "%d,", mg->streams);
 		} else if (gflags & IEEE80211_TX_RC_VHT_MCS) {
 			p += sprintf(p, "VHT%c0,", htmode);
 			p += sprintf(p, "%cGI,", gimode);
 			p += sprintf(p, "%d,", mg->streams);
 		} else {
 			p += sprintf(p, "CCK,");
 			p += sprintf(p, "%cP,", j < 4 ? 'L' : 'S');
 			p += sprintf(p, "1,");
 		}

 		p += sprintf(p, "%s" ,((idx == mi->max_tp_rate[0]) ? "A" : ""));
 		p += sprintf(p, "%s" ,((idx == mi->max_tp_rate[1]) ? "B" : ""));
 		p += sprintf(p, "%s" ,((idx == mi->max_tp_rate[2]) ? "C" : ""));
 		p += sprintf(p, "%s" ,((idx == mi->max_tp_rate[3]) ? "D" : ""));
 		p += sprintf(p, "%s" ,((idx == mi->max_prob_rate) ? "P" : ""));

 		if (gflags & IEEE80211_TX_RC_MCS) {
 			p += sprintf(p, ",MCS%-2u,", (mg->streams - 1) * 8 + j);
 		} else if (gflags & IEEE80211_TX_RC_VHT_MCS) {
 			p += sprintf(p, ",MCS%-1u/%1u,", j, mg->streams);
 		} else {
 			int r = bitrates[j % 4];
 			p += sprintf(p, ",%2u.%1uM,", r / 10, r % 10);
 		}

 		p += sprintf(p, "%u,", idx);
 		tx_time = DIV_ROUND_CLOSEST(mg->duration[j], 1000);
 		p += sprintf(p, "%u,", tx_time);

 		tp_max = minstrel_ht_get_tp_avg(mi, i, j, MINSTREL_FRAC(100, 100));
 		tp_avg = minstrel_ht_get_tp_avg(mi, i, j, mrs->prob_ewma);
 		eprob = MINSTREL_TRUNC(mrs->prob_ewma * 1000);
 		prob_ewmsd = minstrel_get_ewmsd10(mrs);

 		p += sprintf(p, "%u.%u,%u.%u,%u.%u,%u.%u,%u,%u,"
 				"%u,%llu,%llu,",
 				tp_max / 10, tp_max % 10,
 				tp_avg / 10, tp_avg % 10,
 				eprob / 10, eprob % 10,
 				prob_ewmsd / 10, prob_ewmsd % 10,
 				mrs->retry_count,
 				mrs->last_success,
 				mrs->last_attempts,
 				(unsigned long long)mrs->succ_hist,
 				(unsigned long long)mrs->att_hist);
 		p += sprintf(p, "%d,%d,%d.%d\n",
 				max(0, (int) mi->total_packets -
 				(int) mi->sample_packets),
 				mi->sample_packets,
 				MINSTREL_TRUNC(mi->avg_ampdu_len),
 				MINSTREL_TRUNC(mi->avg_ampdu_len * 10) % 10);
 	}

 	return p;
 }

 static int
 minstrel_ht_stats_csv_open(struct inode *inode, struct file *file)
 {
 	struct minstrel_ht_sta_priv *msp = inode->i_private;
 	struct minstrel_ht_sta *mi = &msp->ht;
 	struct minstrel_debugfs_info *ms;
 	unsigned int i;
 	int ret;
 	char *p;

 	if (!msp->is_ht) {
 		inode->i_private = &msp->legacy;
 		ret = minstrel_stats_csv_open(inode, file);
 		inode->i_private = msp;
 		return ret;
 	}

 	ms = kmalloc(32768, GFP_KERNEL);

 	if (!ms)
 		return -ENOMEM;

 	file->private_data = ms;

 	p = ms->buf;

 	p = minstrel_ht_stats_csv_dump(mi, MINSTREL_CCK_GROUP, p);
 	for (i = 0; i < MINSTREL_CCK_GROUP; i++)
 		p = minstrel_ht_stats_csv_dump(mi, i, p);
 	for (i++; i < ARRAY_SIZE(mi->groups); i++)
 		p = minstrel_ht_stats_csv_dump(mi, i, p);

 	ms->len = p - ms->buf;
 	WARN_ON(ms->len + sizeof(*ms) > 32768);

 	return nonseekable_open(inode, file);
 }

 static const struct file_operations minstrel_ht_stat_csv_fops = {
 	.owner = THIS_MODULE,
 	.open = minstrel_ht_stats_csv_open,
 	.read = minstrel_stats_read,
 	.release = minstrel_stats_release,
 	.llseek = no_llseek,
 };

 void
 minstrel_ht_add_sta_debugfs(void *priv, void *priv_sta, struct dentry *dir)
 {
 	struct minstrel_ht_sta_priv *msp = priv_sta;

 	msp->dbg_stats = debugfs_create_file("rc_stats", 0444, dir, msp,
 					     &minstrel_ht_stat_fops);
 	msp->dbg_stats_csv = debugfs_create_file("rc_stats_csv", 0444, dir, msp,
 						 &minstrel_ht_stat_csv_fops);
 }

 void
 minstrel_ht_remove_sta_debugfs(void *priv, void *priv_sta)
 {
 	struct minstrel_ht_sta_priv *msp = priv_sta;

 	debugfs_remove(msp->dbg_stats);
 	debugfs_remove(msp->dbg_stats_csv);
 }
	/*
	* Copyright (C) 2010 Felix Fietkau <nbd@openwrt.org>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*/
	#include <linux/netdevice.h>
	#include <linux/types.h>
	#include <linux/skbuff.h>
	#include <linux/debugfs.h>
	#include <linux/ieee80211.h>
	#include <linux/export.h>
	#include <net/mac80211.h>
	#include "rc80211_minstrel.h"
	#include "rc80211_minstrel_ht.h"

	static char *
	minstrel_ht_stats_dump(struct minstrel_ht_sta mi, int i, char p)
	{
	const struct mcs_group *mg;
	unsigned int j, tp_max, tp_avg, eprob, tx_time;
	char htmode = '2';
	char gimode = 'L';
	u32 gflags;

	if (!mi->supported[i])
	return p;

	mg = &minstrel_mcs_groups[i];
	gflags = mg->flags;

	if (gflags & IEEE80211_TX_RC_40_MHZ_WIDTH)
	htmode = '4';
	else if (gflags & IEEE80211_TX_RC_80_MHZ_WIDTH)
	htmode = '8';
	if (gflags & IEEE80211_TX_RC_SHORT_GI)
	gimode = 'S';

	for (j = 0; j < MCS_GROUP_RATES; j++) {
	struct minstrel_rate_stats *mrs = &mi->groups[i].rates[j];
	static const int bitrates[4] = { 10, 20, 55, 110 };
	int idx = i * MCS_GROUP_RATES + j;
	unsigned int prob_ewmsd;

	if (!(mi->supported[i] & BIT(j)))
	continue;

	if (gflags & IEEE80211_TX_RC_MCS) {
	p += sprintf(p, "HT%c0 ", htmode);
	p += sprintf(p, "%cGI ", gimode);
	p += sprintf(p, "%d ", mg->streams);
	} else if (gflags & IEEE80211_TX_RC_VHT_MCS) {
	p += sprintf(p, "VHT%c0 ", htmode);
	p += sprintf(p, "%cGI ", gimode);
	p += sprintf(p, "%d ", mg->streams);
	} else {
	p += sprintf(p, "CCK ");
	p += sprintf(p, "%cP ", j < 4 ? 'L' : 'S');
	p += sprintf(p, "1 ");
	}

	*(p++) = (idx == mi->max_tp_rate[0]) ? 'A' : ' ';
	*(p++) = (idx == mi->max_tp_rate[1]) ? 'B' : ' ';
	*(p++) = (idx == mi->max_tp_rate[2]) ? 'C' : ' ';
	*(p++) = (idx == mi->max_tp_rate[3]) ? 'D' : ' ';
	*(p++) = (idx == mi->max_prob_rate) ? 'P' : ' ';

	if (gflags & IEEE80211_TX_RC_MCS) {
	p += sprintf(p, " MCS%-2u", (mg->streams - 1) * 8 + j);
	} else if (gflags & IEEE80211_TX_RC_VHT_MCS) {
	p += sprintf(p, " MCS%-1u/%1u", j, mg->streams);
	} else {
	int r = bitrates[j % 4];

	p += sprintf(p, " %2u.%1uM", r / 10, r % 10);
	}

	p += sprintf(p, " %3u ", idx);

	/* tx_time[rate(i)] in usec */
	tx_time = DIV_ROUND_CLOSEST(mg->duration[j], 1000);
	p += sprintf(p, "%6u ", tx_time);

	tp_max = minstrel_ht_get_tp_avg(mi, i, j, MINSTREL_FRAC(100, 100));
	tp_avg = minstrel_ht_get_tp_avg(mi, i, j, mrs->prob_ewma);
	eprob = MINSTREL_TRUNC(mrs->prob_ewma * 1000);
	prob_ewmsd = minstrel_get_ewmsd10(mrs);

	p += sprintf(p, "%4u.%1u %4u.%1u %3u.%1u %3u.%1u"
	" %3u %3u %-3u "
	"%9llu %-9llu\n",
	tp_max / 10, tp_max % 10,
	tp_avg / 10, tp_avg % 10,
	eprob / 10, eprob % 10,
	prob_ewmsd / 10, prob_ewmsd % 10,
	mrs->retry_count,
	mrs->last_success,
	mrs->last_attempts,
	(unsigned long long)mrs->succ_hist,
	(unsigned long long)mrs->att_hist);
	}

	return p;
	}

	static int
	minstrel_ht_stats_open(struct inode inode, struct file file)
	{
	struct minstrel_ht_sta_priv *msp = inode->i_private;
	struct minstrel_ht_sta *mi = &msp->ht;
	struct minstrel_debugfs_info *ms;
	unsigned int i;
	int ret;
	char *p;

	if (!msp->is_ht) {
	inode->i_private = &msp->legacy;
	ret = minstrel_stats_open(inode, file);
	inode->i_private = msp;
	return ret;
	}

	ms = kmalloc(32768, GFP_KERNEL);
	if (!ms)
	return -ENOMEM;

	file->private_data = ms;
	p = ms->buf;

	p += sprintf(p, "\n");
	p += sprintf(p,
	" best ____________rate__________ ________statistics________ _____last____ ______sum-of________\n");
	p += sprintf(p,
	"mode guard # rate [name idx airtime max_tp] [avg(tp) avg(prob) sd(prob)] [retry\|suc\|att] [#success \| #attempts]\n");

	p = minstrel_ht_stats_dump(mi, MINSTREL_CCK_GROUP, p);
	for (i = 0; i < MINSTREL_CCK_GROUP; i++)
	p = minstrel_ht_stats_dump(mi, i, p);
	for (i++; i < ARRAY_SIZE(mi->groups); i++)
	p = minstrel_ht_stats_dump(mi, i, p);

	p += sprintf(p, "\nTotal packet count:: ideal %d "
	"lookaround %d\n",
	max(0, (int) mi->total_packets - (int) mi->sample_packets),
	mi->sample_packets);
	p += sprintf(p, "Average # of aggregated frames per A-MPDU: %d.%d\n",
	MINSTREL_TRUNC(mi->avg_ampdu_len),
	MINSTREL_TRUNC(mi->avg_ampdu_len * 10) % 10);
	ms->len = p - ms->buf;
	WARN_ON(ms->len + sizeof(*ms) > 32768);

	return nonseekable_open(inode, file);
	}

	static const struct file_operations minstrel_ht_stat_fops = {
	.owner = THIS_MODULE,
	.open = minstrel_ht_stats_open,
	.read = minstrel_stats_read,
	.release = minstrel_stats_release,
	.llseek = no_llseek,
	};

	static char *
	minstrel_ht_stats_csv_dump(struct minstrel_ht_sta mi, int i, char p)
	{
	const struct mcs_group *mg;
	unsigned int j, tp_max, tp_avg, eprob, tx_time;
	char htmode = '2';
	char gimode = 'L';
	u32 gflags;

	if (!mi->supported[i])
	return p;

	mg = &minstrel_mcs_groups[i];
	gflags = mg->flags;

	if (gflags & IEEE80211_TX_RC_40_MHZ_WIDTH)
	htmode = '4';
	else if (gflags & IEEE80211_TX_RC_80_MHZ_WIDTH)
	htmode = '8';
	if (gflags & IEEE80211_TX_RC_SHORT_GI)
	gimode = 'S';

	for (j = 0; j < MCS_GROUP_RATES; j++) {
	struct minstrel_rate_stats *mrs = &mi->groups[i].rates[j];
	static const int bitrates[4] = { 10, 20, 55, 110 };
	int idx = i * MCS_GROUP_RATES + j;
	unsigned int prob_ewmsd;

	if (!(mi->supported[i] & BIT(j)))
	continue;

	if (gflags & IEEE80211_TX_RC_MCS) {
	p += sprintf(p, "HT%c0,", htmode);
	p += sprintf(p, "%cGI,", gimode);
	p += sprintf(p, "%d,", mg->streams);
	} else if (gflags & IEEE80211_TX_RC_VHT_MCS) {
	p += sprintf(p, "VHT%c0,", htmode);
	p += sprintf(p, "%cGI,", gimode);
	p += sprintf(p, "%d,", mg->streams);
	} else {
	p += sprintf(p, "CCK,");
	p += sprintf(p, "%cP,", j < 4 ? 'L' : 'S');
	p += sprintf(p, "1,");
	}

	p += sprintf(p, "%s" ,((idx == mi->max_tp_rate[0]) ? "A" : ""));
	p += sprintf(p, "%s" ,((idx == mi->max_tp_rate[1]) ? "B" : ""));
	p += sprintf(p, "%s" ,((idx == mi->max_tp_rate[2]) ? "C" : ""));
	p += sprintf(p, "%s" ,((idx == mi->max_tp_rate[3]) ? "D" : ""));
	p += sprintf(p, "%s" ,((idx == mi->max_prob_rate) ? "P" : ""));

	if (gflags & IEEE80211_TX_RC_MCS) {
	p += sprintf(p, ",MCS%-2u,", (mg->streams - 1) * 8 + j);
	} else if (gflags & IEEE80211_TX_RC_VHT_MCS) {
	p += sprintf(p, ",MCS%-1u/%1u,", j, mg->streams);
	} else {
	int r = bitrates[j % 4];
	p += sprintf(p, ",%2u.%1uM,", r / 10, r % 10);
	}

	p += sprintf(p, "%u,", idx);
	tx_time = DIV_ROUND_CLOSEST(mg->duration[j], 1000);
	p += sprintf(p, "%u,", tx_time);

	tp_max = minstrel_ht_get_tp_avg(mi, i, j, MINSTREL_FRAC(100, 100));
	tp_avg = minstrel_ht_get_tp_avg(mi, i, j, mrs->prob_ewma);
	eprob = MINSTREL_TRUNC(mrs->prob_ewma * 1000);
	prob_ewmsd = minstrel_get_ewmsd10(mrs);

	p += sprintf(p, "%u.%u,%u.%u,%u.%u,%u.%u,%u,%u,"
	"%u,%llu,%llu,",
	tp_max / 10, tp_max % 10,
	tp_avg / 10, tp_avg % 10,
	eprob / 10, eprob % 10,
	prob_ewmsd / 10, prob_ewmsd % 10,
	mrs->retry_count,
	mrs->last_success,
	mrs->last_attempts,
	(unsigned long long)mrs->succ_hist,
	(unsigned long long)mrs->att_hist);
	p += sprintf(p, "%d,%d,%d.%d\n",
	max(0, (int) mi->total_packets -
	(int) mi->sample_packets),
	mi->sample_packets,
	MINSTREL_TRUNC(mi->avg_ampdu_len),
	MINSTREL_TRUNC(mi->avg_ampdu_len * 10) % 10);
	}

	return p;
	}

	static int
	minstrel_ht_stats_csv_open(struct inode inode, struct file file)
	{
	struct minstrel_ht_sta_priv *msp = inode->i_private;
	struct minstrel_ht_sta *mi = &msp->ht;
	struct minstrel_debugfs_info *ms;
	unsigned int i;
	int ret;
	char *p;

	if (!msp->is_ht) {
	inode->i_private = &msp->legacy;
	ret = minstrel_stats_csv_open(inode, file);
	inode->i_private = msp;
	return ret;
	}

	ms = kmalloc(32768, GFP_KERNEL);

	if (!ms)
	return -ENOMEM;

	file->private_data = ms;

	p = ms->buf;

	p = minstrel_ht_stats_csv_dump(mi, MINSTREL_CCK_GROUP, p);
	for (i = 0; i < MINSTREL_CCK_GROUP; i++)
	p = minstrel_ht_stats_csv_dump(mi, i, p);
	for (i++; i < ARRAY_SIZE(mi->groups); i++)
	p = minstrel_ht_stats_csv_dump(mi, i, p);

	ms->len = p - ms->buf;
	WARN_ON(ms->len + sizeof(*ms) > 32768);

	return nonseekable_open(inode, file);
	}

	static const struct file_operations minstrel_ht_stat_csv_fops = {
	.owner = THIS_MODULE,
	.open = minstrel_ht_stats_csv_open,
	.read = minstrel_stats_read,
	.release = minstrel_stats_release,
	.llseek = no_llseek,
	};

	void
	minstrel_ht_add_sta_debugfs(void priv, void priv_sta, struct dentry *dir)
	{
	struct minstrel_ht_sta_priv *msp = priv_sta;

	msp->dbg_stats = debugfs_create_file("rc_stats", 0444, dir, msp,
	&minstrel_ht_stat_fops);
	msp->dbg_stats_csv = debugfs_create_file("rc_stats_csv", 0444, dir, msp,
	&minstrel_ht_stat_csv_fops);
	}

	void
	minstrel_ht_remove_sta_debugfs(void priv, void priv_sta)
	{
	struct minstrel_ht_sta_priv *msp = priv_sta;

	debugfs_remove(msp->dbg_stats);
	debugfs_remove(msp->dbg_stats_csv);
	}