net/mac80211/debugfs.c - linux/kernel/git/viro/vfs - Git at Google

 /*
  * mac80211 debugfs for wireless PHYs
  *
  * Copyright 2007	Johannes Berg <johannes@sipsolutions.net>
  * Copyright 2013-2014  Intel Mobile Communications GmbH
  *
  * GPLv2
  *
  */

 #include <linux/debugfs.h>
 #include <linux/rtnetlink.h>
 #include <linux/vmalloc.h>
 #include "ieee80211_i.h"
 #include "driver-ops.h"
 #include "rate.h"
 #include "debugfs.h"

 #define DEBUGFS_FORMAT_BUFFER_SIZE 100

 int mac80211_format_buffer(char __user *userbuf, size_t count,
 				  loff_t *ppos, char *fmt, ...)
 {
 	va_list args;
 	char buf[DEBUGFS_FORMAT_BUFFER_SIZE];
 	int res;

 	va_start(args, fmt);
 	res = vscnprintf(buf, sizeof(buf), fmt, args);
 	va_end(args);

 	return simple_read_from_buffer(userbuf, count, ppos, buf, res);
 }

 #define DEBUGFS_READONLY_FILE_FN(name, fmt, value...)			\
 static ssize_t name## _read(struct file *file, char __user *userbuf,	\
 			    size_t count, loff_t *ppos)			\
 {									\
 	struct ieee80211_local *local = file->private_data;		\
 									\
 	return mac80211_format_buffer(userbuf, count, ppos, 		\
 				      fmt "\n", ##value);		\
 }

 #define DEBUGFS_READONLY_FILE_OPS(name)			\
 static const struct file_operations name## _ops = {			\
 	.read = name## _read,						\
 	.open = simple_open,						\
 	.llseek = generic_file_llseek,					\
 };

 #define DEBUGFS_READONLY_FILE(name, fmt, value...)		\
 	DEBUGFS_READONLY_FILE_FN(name, fmt, value)		\
 	DEBUGFS_READONLY_FILE_OPS(name)

 #define DEBUGFS_ADD(name)						\
 	debugfs_create_file(#name, 0400, phyd, local, &name## _ops);

 #define DEBUGFS_ADD_MODE(name, mode)					\
 	debugfs_create_file(#name, mode, phyd, local, &name## _ops);


 DEBUGFS_READONLY_FILE(user_power, "%d",
 		      local->user_power_level);
 DEBUGFS_READONLY_FILE(power, "%d",
 		      local->hw.conf.power_level);
 DEBUGFS_READONLY_FILE(total_ps_buffered, "%d",
 		      local->total_ps_buffered);
 DEBUGFS_READONLY_FILE(wep_iv, "%#08x",
 		      local->wep_iv & 0xffffff);
 DEBUGFS_READONLY_FILE(rate_ctrl_alg, "%s",
 	local->rate_ctrl ? local->rate_ctrl->ops->name : "hw/driver");

 static ssize_t aqm_read(struct file *file,
 			char __user *user_buf,
 			size_t count,
 			loff_t *ppos)
 {
 	struct ieee80211_local *local = file->private_data;
 	struct fq *fq = &local->fq;
 	char buf[200];
 	int len = 0;

 	spin_lock_bh(&local->fq.lock);
 	rcu_read_lock();

 	len = scnprintf(buf, sizeof(buf),
 			"access name value\n"
 			"R fq_flows_cnt %u\n"
 			"R fq_backlog %u\n"
 			"R fq_overlimit %u\n"
 			"R fq_overmemory %u\n"
 			"R fq_collisions %u\n"
 			"R fq_memory_usage %u\n"
 			"RW fq_memory_limit %u\n"
 			"RW fq_limit %u\n"
 			"RW fq_quantum %u\n",
 			fq->flows_cnt,
 			fq->backlog,
 			fq->overmemory,
 			fq->overlimit,
 			fq->collisions,
 			fq->memory_usage,
 			fq->memory_limit,
 			fq->limit,
 			fq->quantum);

 	rcu_read_unlock();
 	spin_unlock_bh(&local->fq.lock);

 	return simple_read_from_buffer(user_buf, count, ppos,
 				       buf, len);
 }

 static ssize_t aqm_write(struct file *file,
 			 const char __user *user_buf,
 			 size_t count,
 			 loff_t *ppos)
 {
 	struct ieee80211_local *local = file->private_data;
 	char buf[100];
 	size_t len;

 	if (count > sizeof(buf))
 		return -EINVAL;

 	if (copy_from_user(buf, user_buf, count))
 		return -EFAULT;

 	buf[sizeof(buf) - 1] = '\0';
 	len = strlen(buf);
 	if (len > 0 && buf[len-1] == '\n')
 		buf[len-1] = 0;

 	if (sscanf(buf, "fq_limit %u", &local->fq.limit) == 1)
 		return count;
 	else if (sscanf(buf, "fq_memory_limit %u", &local->fq.memory_limit) == 1)
 		return count;
 	else if (sscanf(buf, "fq_quantum %u", &local->fq.quantum) == 1)
 		return count;

 	return -EINVAL;
 }

 static const struct file_operations aqm_ops = {
 	.write = aqm_write,
 	.read = aqm_read,
 	.open = simple_open,
 	.llseek = default_llseek,
 };

 #ifdef CONFIG_PM
 static ssize_t reset_write(struct file *file, const char __user *user_buf,
 			   size_t count, loff_t *ppos)
 {
 	struct ieee80211_local *local = file->private_data;

 	rtnl_lock();
 	__ieee80211_suspend(&local->hw, NULL);
 	__ieee80211_resume(&local->hw);
 	rtnl_unlock();

 	return count;
 }

 static const struct file_operations reset_ops = {
 	.write = reset_write,
 	.open = simple_open,
 	.llseek = noop_llseek,
 };
 #endif

 static const char *hw_flag_names[] = {
 #define FLAG(F)	[IEEE80211_HW_##F] = #F
 	FLAG(HAS_RATE_CONTROL),
 	FLAG(RX_INCLUDES_FCS),
 	FLAG(HOST_BROADCAST_PS_BUFFERING),
 	FLAG(SIGNAL_UNSPEC),
 	FLAG(SIGNAL_DBM),
 	FLAG(NEED_DTIM_BEFORE_ASSOC),
 	FLAG(SPECTRUM_MGMT),
 	FLAG(AMPDU_AGGREGATION),
 	FLAG(SUPPORTS_PS),
 	FLAG(PS_NULLFUNC_STACK),
 	FLAG(SUPPORTS_DYNAMIC_PS),
 	FLAG(MFP_CAPABLE),
 	FLAG(WANT_MONITOR_VIF),
 	FLAG(NO_AUTO_VIF),
 	FLAG(SW_CRYPTO_CONTROL),
 	FLAG(SUPPORT_FAST_XMIT),
 	FLAG(REPORTS_TX_ACK_STATUS),
 	FLAG(CONNECTION_MONITOR),
 	FLAG(QUEUE_CONTROL),
 	FLAG(SUPPORTS_PER_STA_GTK),
 	FLAG(AP_LINK_PS),
 	FLAG(TX_AMPDU_SETUP_IN_HW),
 	FLAG(SUPPORTS_RC_TABLE),
 	FLAG(P2P_DEV_ADDR_FOR_INTF),
 	FLAG(TIMING_BEACON_ONLY),
 	FLAG(SUPPORTS_HT_CCK_RATES),
 	FLAG(CHANCTX_STA_CSA),
 	FLAG(SUPPORTS_CLONED_SKBS),
 	FLAG(SINGLE_SCAN_ON_ALL_BANDS),
 	FLAG(TDLS_WIDER_BW),
 	FLAG(SUPPORTS_AMSDU_IN_AMPDU),
 	FLAG(BEACON_TX_STATUS),
 	FLAG(NEEDS_UNIQUE_STA_ADDR),
 	FLAG(SUPPORTS_REORDERING_BUFFER),
 	FLAG(USES_RSS),
 	FLAG(TX_AMSDU),
 	FLAG(TX_FRAG_LIST),
 	FLAG(REPORTS_LOW_ACK),
 	FLAG(SUPPORTS_TX_FRAG),
 	FLAG(SUPPORTS_TDLS_BUFFER_STA),
 	FLAG(DEAUTH_NEED_MGD_TX_PREP),
 	FLAG(DOESNT_SUPPORT_QOS_NDP),
 #undef FLAG
 };

 static ssize_t hwflags_read(struct file *file, char __user *user_buf,
 			    size_t count, loff_t *ppos)
 {
 	struct ieee80211_local *local = file->private_data;
 	size_t bufsz = 30 * NUM_IEEE80211_HW_FLAGS;
 	char *buf = kzalloc(bufsz, GFP_KERNEL);
 	char *pos = buf, *end = buf + bufsz - 1;
 	ssize_t rv;
 	int i;

 	if (!buf)
 		return -ENOMEM;

 	/* fail compilation if somebody adds or removes
 	 * a flag without updating the name array above
 	 */
 	BUILD_BUG_ON(ARRAY_SIZE(hw_flag_names) != NUM_IEEE80211_HW_FLAGS);

 	for (i = 0; i < NUM_IEEE80211_HW_FLAGS; i++) {
 		if (test_bit(i, local->hw.flags))
 			pos += scnprintf(pos, end - pos, "%s\n",
 					 hw_flag_names[i]);
 	}

 	rv = simple_read_from_buffer(user_buf, count, ppos, buf, strlen(buf));
 	kfree(buf);
 	return rv;
 }

 static ssize_t misc_read(struct file *file, char __user *user_buf,
 			 size_t count, loff_t *ppos)
 {
 	struct ieee80211_local *local = file->private_data;
 	/* Max len of each line is 16 characters, plus 9 for 'pending:\n' */
 	size_t bufsz = IEEE80211_MAX_QUEUES * 16 + 9;
 	char *buf;
 	char *pos, *end;
 	ssize_t rv;
 	int i;
 	int ln;

 	buf = kzalloc(bufsz, GFP_KERNEL);
 	if (!buf)
 		return -ENOMEM;

 	pos = buf;
 	end = buf + bufsz - 1;

 	pos += scnprintf(pos, end - pos, "pending:\n");

 	for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 		ln = skb_queue_len(&local->pending[i]);
 		pos += scnprintf(pos, end - pos, "[%i] %d\n",
 				 i, ln);
 	}

 	rv = simple_read_from_buffer(user_buf, count, ppos, buf, strlen(buf));
 	kfree(buf);
 	return rv;
 }

 static ssize_t queues_read(struct file *file, char __user *user_buf,
 			   size_t count, loff_t *ppos)
 {
 	struct ieee80211_local *local = file->private_data;
 	unsigned long flags;
 	char buf[IEEE80211_MAX_QUEUES * 20];
 	int q, res = 0;

 	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 	for (q = 0; q < local->hw.queues; q++)
 		res += sprintf(buf + res, "%02d: %#.8lx/%d\n", q,
 				local->queue_stop_reasons[q],
 				skb_queue_len(&local->pending[q]));
 	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);

 	return simple_read_from_buffer(user_buf, count, ppos, buf, res);
 }

 DEBUGFS_READONLY_FILE_OPS(hwflags);
 DEBUGFS_READONLY_FILE_OPS(queues);
 DEBUGFS_READONLY_FILE_OPS(misc);

 /* statistics stuff */

 static ssize_t format_devstat_counter(struct ieee80211_local *local,
 	char __user *userbuf,
 	size_t count, loff_t *ppos,
 	int (*printvalue)(struct ieee80211_low_level_stats *stats, char *buf,
 			  int buflen))
 {
 	struct ieee80211_low_level_stats stats;
 	char buf[20];
 	int res;

 	rtnl_lock();
 	res = drv_get_stats(local, &stats);
 	rtnl_unlock();
 	if (res)
 		return res;
 	res = printvalue(&stats, buf, sizeof(buf));
 	return simple_read_from_buffer(userbuf, count, ppos, buf, res);
 }

 #define DEBUGFS_DEVSTATS_FILE(name)					\
 static int print_devstats_##name(struct ieee80211_low_level_stats *stats,\
 				 char *buf, int buflen)			\
 {									\
 	return scnprintf(buf, buflen, "%u\n", stats->name);		\
 }									\
 static ssize_t stats_ ##name## _read(struct file *file,			\
 				     char __user *userbuf,		\
 				     size_t count, loff_t *ppos)	\
 {									\
 	return format_devstat_counter(file->private_data,		\
 				      userbuf,				\
 				      count,				\
 				      ppos,				\
 				      print_devstats_##name);		\
 }									\
 									\
 static const struct file_operations stats_ ##name## _ops = {		\
 	.read = stats_ ##name## _read,					\
 	.open = simple_open,						\
 	.llseek = generic_file_llseek,					\
 };

 #define DEBUGFS_STATS_ADD(name)					\
 	debugfs_create_u32(#name, 0400, statsd, &local->name);
 #define DEBUGFS_DEVSTATS_ADD(name)					\
 	debugfs_create_file(#name, 0400, statsd, local, &stats_ ##name## _ops);

 DEBUGFS_DEVSTATS_FILE(dot11ACKFailureCount);
 DEBUGFS_DEVSTATS_FILE(dot11RTSFailureCount);
 DEBUGFS_DEVSTATS_FILE(dot11FCSErrorCount);
 DEBUGFS_DEVSTATS_FILE(dot11RTSSuccessCount);

 void debugfs_hw_add(struct ieee80211_local *local)
 {
 	struct dentry *phyd = local->hw.wiphy->debugfsdir;
 	struct dentry *statsd;

 	if (!phyd)
 		return;

 	local->debugfs.keys = debugfs_create_dir("keys", phyd);

 	DEBUGFS_ADD(total_ps_buffered);
 	DEBUGFS_ADD(wep_iv);
 	DEBUGFS_ADD(rate_ctrl_alg);
 	DEBUGFS_ADD(queues);
 	DEBUGFS_ADD(misc);
 #ifdef CONFIG_PM
 	DEBUGFS_ADD_MODE(reset, 0200);
 #endif
 	DEBUGFS_ADD(hwflags);
 	DEBUGFS_ADD(user_power);
 	DEBUGFS_ADD(power);

 	if (local->ops->wake_tx_queue)
 		DEBUGFS_ADD_MODE(aqm, 0600);

 	statsd = debugfs_create_dir("statistics", phyd);

 	/* if the dir failed, don't put all the other things into the root! */
 	if (!statsd)
 		return;

 #ifdef CONFIG_MAC80211_DEBUG_COUNTERS
 	DEBUGFS_STATS_ADD(dot11TransmittedFragmentCount);
 	DEBUGFS_STATS_ADD(dot11MulticastTransmittedFrameCount);
 	DEBUGFS_STATS_ADD(dot11FailedCount);
 	DEBUGFS_STATS_ADD(dot11RetryCount);
 	DEBUGFS_STATS_ADD(dot11MultipleRetryCount);
 	DEBUGFS_STATS_ADD(dot11FrameDuplicateCount);
 	DEBUGFS_STATS_ADD(dot11ReceivedFragmentCount);
 	DEBUGFS_STATS_ADD(dot11MulticastReceivedFrameCount);
 	DEBUGFS_STATS_ADD(dot11TransmittedFrameCount);
 	DEBUGFS_STATS_ADD(tx_handlers_drop);
 	DEBUGFS_STATS_ADD(tx_handlers_queued);
 	DEBUGFS_STATS_ADD(tx_handlers_drop_wep);
 	DEBUGFS_STATS_ADD(tx_handlers_drop_not_assoc);
 	DEBUGFS_STATS_ADD(tx_handlers_drop_unauth_port);
 	DEBUGFS_STATS_ADD(rx_handlers_drop);
 	DEBUGFS_STATS_ADD(rx_handlers_queued);
 	DEBUGFS_STATS_ADD(rx_handlers_drop_nullfunc);
 	DEBUGFS_STATS_ADD(rx_handlers_drop_defrag);
 	DEBUGFS_STATS_ADD(tx_expand_skb_head);
 	DEBUGFS_STATS_ADD(tx_expand_skb_head_cloned);
 	DEBUGFS_STATS_ADD(rx_expand_skb_head_defrag);
 	DEBUGFS_STATS_ADD(rx_handlers_fragments);
 	DEBUGFS_STATS_ADD(tx_status_drop);
 #endif
 	DEBUGFS_DEVSTATS_ADD(dot11ACKFailureCount);
 	DEBUGFS_DEVSTATS_ADD(dot11RTSFailureCount);
 	DEBUGFS_DEVSTATS_ADD(dot11FCSErrorCount);
 	DEBUGFS_DEVSTATS_ADD(dot11RTSSuccessCount);
 }
	/*
	* mac80211 debugfs for wireless PHYs
	*
	* Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
	* Copyright 2013-2014 Intel Mobile Communications GmbH
	*
	* GPLv2
	*
	*/

	#include <linux/debugfs.h>
	#include <linux/rtnetlink.h>
	#include <linux/vmalloc.h>
	#include "ieee80211_i.h"
	#include "driver-ops.h"
	#include "rate.h"
	#include "debugfs.h"

	#define DEBUGFS_FORMAT_BUFFER_SIZE 100

	int mac80211_format_buffer(char __user *userbuf, size_t count,
	loff_t ppos, char fmt, ...)
	{
	va_list args;
	char buf[DEBUGFS_FORMAT_BUFFER_SIZE];
	int res;

	va_start(args, fmt);
	res = vscnprintf(buf, sizeof(buf), fmt, args);
	va_end(args);

	return simple_read_from_buffer(userbuf, count, ppos, buf, res);
	}

	#define DEBUGFS_READONLY_FILE_FN(name, fmt, value...) \
	static ssize_t name## _read(struct file file, char __user userbuf, \
	size_t count, loff_t *ppos) \
	{ \
	struct ieee80211_local *local = file->private_data; \
	\
	return mac80211_format_buffer(userbuf, count, ppos, \
	fmt "\n", ##value); \
	}

	#define DEBUGFS_READONLY_FILE_OPS(name) \
	static const struct file_operations name## _ops = { \
	.read = name## _read, \
	.open = simple_open, \
	.llseek = generic_file_llseek, \
	};

	#define DEBUGFS_READONLY_FILE(name, fmt, value...) \
	DEBUGFS_READONLY_FILE_FN(name, fmt, value) \
	DEBUGFS_READONLY_FILE_OPS(name)

	#define DEBUGFS_ADD(name) \
	debugfs_create_file(#name, 0400, phyd, local, &name## _ops);

	#define DEBUGFS_ADD_MODE(name, mode) \
	debugfs_create_file(#name, mode, phyd, local, &name## _ops);


	DEBUGFS_READONLY_FILE(user_power, "%d",
	local->user_power_level);
	DEBUGFS_READONLY_FILE(power, "%d",
	local->hw.conf.power_level);
	DEBUGFS_READONLY_FILE(total_ps_buffered, "%d",
	local->total_ps_buffered);
	DEBUGFS_READONLY_FILE(wep_iv, "%#08x",
	local->wep_iv & 0xffffff);
	DEBUGFS_READONLY_FILE(rate_ctrl_alg, "%s",
	local->rate_ctrl ? local->rate_ctrl->ops->name : "hw/driver");

	static ssize_t aqm_read(struct file *file,
	char __user *user_buf,
	size_t count,
	loff_t *ppos)
	{
	struct ieee80211_local *local = file->private_data;
	struct fq *fq = &local->fq;
	char buf[200];
	int len = 0;

	spin_lock_bh(&local->fq.lock);
	rcu_read_lock();

	len = scnprintf(buf, sizeof(buf),
	"access name value\n"
	"R fq_flows_cnt %u\n"
	"R fq_backlog %u\n"
	"R fq_overlimit %u\n"
	"R fq_overmemory %u\n"
	"R fq_collisions %u\n"
	"R fq_memory_usage %u\n"
	"RW fq_memory_limit %u\n"
	"RW fq_limit %u\n"
	"RW fq_quantum %u\n",
	fq->flows_cnt,
	fq->backlog,
	fq->overmemory,
	fq->overlimit,
	fq->collisions,
	fq->memory_usage,
	fq->memory_limit,
	fq->limit,
	fq->quantum);

	rcu_read_unlock();
	spin_unlock_bh(&local->fq.lock);

	return simple_read_from_buffer(user_buf, count, ppos,
	buf, len);
	}

	static ssize_t aqm_write(struct file *file,
	const char __user *user_buf,
	size_t count,
	loff_t *ppos)
	{
	struct ieee80211_local *local = file->private_data;
	char buf[100];
	size_t len;

	if (count > sizeof(buf))
	return -EINVAL;

	if (copy_from_user(buf, user_buf, count))
	return -EFAULT;

	buf[sizeof(buf) - 1] = '\0';
	len = strlen(buf);
	if (len > 0 && buf[len-1] == '\n')
	buf[len-1] = 0;

	if (sscanf(buf, "fq_limit %u", &local->fq.limit) == 1)
	return count;
	else if (sscanf(buf, "fq_memory_limit %u", &local->fq.memory_limit) == 1)
	return count;
	else if (sscanf(buf, "fq_quantum %u", &local->fq.quantum) == 1)
	return count;

	return -EINVAL;
	}

	static const struct file_operations aqm_ops = {
	.write = aqm_write,
	.read = aqm_read,
	.open = simple_open,
	.llseek = default_llseek,
	};

	#ifdef CONFIG_PM
	static ssize_t reset_write(struct file file, const char __user user_buf,
	size_t count, loff_t *ppos)
	{
	struct ieee80211_local *local = file->private_data;

	rtnl_lock();
	__ieee80211_suspend(&local->hw, NULL);
	__ieee80211_resume(&local->hw);
	rtnl_unlock();

	return count;
	}

	static const struct file_operations reset_ops = {
	.write = reset_write,
	.open = simple_open,
	.llseek = noop_llseek,
	};
	#endif

	static const char *hw_flag_names[] = {
	#define FLAG(F) [IEEE80211_HW_##F] = #F
	FLAG(HAS_RATE_CONTROL),
	FLAG(RX_INCLUDES_FCS),
	FLAG(HOST_BROADCAST_PS_BUFFERING),
	FLAG(SIGNAL_UNSPEC),
	FLAG(SIGNAL_DBM),
	FLAG(NEED_DTIM_BEFORE_ASSOC),
	FLAG(SPECTRUM_MGMT),
	FLAG(AMPDU_AGGREGATION),
	FLAG(SUPPORTS_PS),
	FLAG(PS_NULLFUNC_STACK),
	FLAG(SUPPORTS_DYNAMIC_PS),
	FLAG(MFP_CAPABLE),
	FLAG(WANT_MONITOR_VIF),
	FLAG(NO_AUTO_VIF),
	FLAG(SW_CRYPTO_CONTROL),
	FLAG(SUPPORT_FAST_XMIT),
	FLAG(REPORTS_TX_ACK_STATUS),
	FLAG(CONNECTION_MONITOR),
	FLAG(QUEUE_CONTROL),
	FLAG(SUPPORTS_PER_STA_GTK),
	FLAG(AP_LINK_PS),
	FLAG(TX_AMPDU_SETUP_IN_HW),
	FLAG(SUPPORTS_RC_TABLE),
	FLAG(P2P_DEV_ADDR_FOR_INTF),
	FLAG(TIMING_BEACON_ONLY),
	FLAG(SUPPORTS_HT_CCK_RATES),
	FLAG(CHANCTX_STA_CSA),
	FLAG(SUPPORTS_CLONED_SKBS),
	FLAG(SINGLE_SCAN_ON_ALL_BANDS),
	FLAG(TDLS_WIDER_BW),
	FLAG(SUPPORTS_AMSDU_IN_AMPDU),
	FLAG(BEACON_TX_STATUS),
	FLAG(NEEDS_UNIQUE_STA_ADDR),
	FLAG(SUPPORTS_REORDERING_BUFFER),
	FLAG(USES_RSS),
	FLAG(TX_AMSDU),
	FLAG(TX_FRAG_LIST),
	FLAG(REPORTS_LOW_ACK),
	FLAG(SUPPORTS_TX_FRAG),
	FLAG(SUPPORTS_TDLS_BUFFER_STA),
	FLAG(DEAUTH_NEED_MGD_TX_PREP),
	FLAG(DOESNT_SUPPORT_QOS_NDP),
	#undef FLAG
	};

	static ssize_t hwflags_read(struct file file, char __user user_buf,
	size_t count, loff_t *ppos)
	{
	struct ieee80211_local *local = file->private_data;
	size_t bufsz = 30 * NUM_IEEE80211_HW_FLAGS;
	char *buf = kzalloc(bufsz, GFP_KERNEL);
	char pos = buf, end = buf + bufsz - 1;
	ssize_t rv;
	int i;

	if (!buf)
	return -ENOMEM;

	/* fail compilation if somebody adds or removes
	* a flag without updating the name array above
	*/
	BUILD_BUG_ON(ARRAY_SIZE(hw_flag_names) != NUM_IEEE80211_HW_FLAGS);

	for (i = 0; i < NUM_IEEE80211_HW_FLAGS; i++) {
	if (test_bit(i, local->hw.flags))
	pos += scnprintf(pos, end - pos, "%s\n",
	hw_flag_names[i]);
	}

	rv = simple_read_from_buffer(user_buf, count, ppos, buf, strlen(buf));
	kfree(buf);
	return rv;
	}

	static ssize_t misc_read(struct file file, char __user user_buf,
	size_t count, loff_t *ppos)
	{
	struct ieee80211_local *local = file->private_data;
	/* Max len of each line is 16 characters, plus 9 for 'pending:\n' */
	size_t bufsz = IEEE80211_MAX_QUEUES * 16 + 9;
	char *buf;
	char pos, end;
	ssize_t rv;
	int i;
	int ln;

	buf = kzalloc(bufsz, GFP_KERNEL);
	if (!buf)
	return -ENOMEM;

	pos = buf;
	end = buf + bufsz - 1;

	pos += scnprintf(pos, end - pos, "pending:\n");

	for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
	ln = skb_queue_len(&local->pending[i]);
	pos += scnprintf(pos, end - pos, "[%i] %d\n",
	i, ln);
	}

	rv = simple_read_from_buffer(user_buf, count, ppos, buf, strlen(buf));
	kfree(buf);
	return rv;
	}

	static ssize_t queues_read(struct file file, char __user user_buf,
	size_t count, loff_t *ppos)
	{
	struct ieee80211_local *local = file->private_data;
	unsigned long flags;
	char buf[IEEE80211_MAX_QUEUES * 20];
	int q, res = 0;

	spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
	for (q = 0; q < local->hw.queues; q++)
	res += sprintf(buf + res, "%02d: %#.8lx/%d\n", q,
	local->queue_stop_reasons[q],
	skb_queue_len(&local->pending[q]));
	spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);

	return simple_read_from_buffer(user_buf, count, ppos, buf, res);
	}

	DEBUGFS_READONLY_FILE_OPS(hwflags);
	DEBUGFS_READONLY_FILE_OPS(queues);
	DEBUGFS_READONLY_FILE_OPS(misc);

	/* statistics stuff */

	static ssize_t format_devstat_counter(struct ieee80211_local *local,
	char __user *userbuf,
	size_t count, loff_t *ppos,
	int (printvalue)(struct ieee80211_low_level_stats stats, char *buf,
	int buflen))
	{
	struct ieee80211_low_level_stats stats;
	char buf[20];
	int res;

	rtnl_lock();
	res = drv_get_stats(local, &stats);
	rtnl_unlock();
	if (res)
	return res;
	res = printvalue(&stats, buf, sizeof(buf));
	return simple_read_from_buffer(userbuf, count, ppos, buf, res);
	}

	#define DEBUGFS_DEVSTATS_FILE(name) \
	static int print_devstats_##name(struct ieee80211_low_level_stats *stats,\
	char *buf, int buflen) \
	{ \
	return scnprintf(buf, buflen, "%u\n", stats->name); \
	} \
	static ssize_t stats_ ##name## _read(struct file *file, \
	char __user *userbuf, \
	size_t count, loff_t *ppos) \
	{ \
	return format_devstat_counter(file->private_data, \
	userbuf, \
	count, \
	ppos, \
	print_devstats_##name); \
	} \
	\
	static const struct file_operations stats_ ##name## _ops = { \
	.read = stats_ ##name## _read, \
	.open = simple_open, \
	.llseek = generic_file_llseek, \
	};

	#define DEBUGFS_STATS_ADD(name) \
	debugfs_create_u32(#name, 0400, statsd, &local->name);
	#define DEBUGFS_DEVSTATS_ADD(name) \
	debugfs_create_file(#name, 0400, statsd, local, &stats_ ##name## _ops);

	DEBUGFS_DEVSTATS_FILE(dot11ACKFailureCount);
	DEBUGFS_DEVSTATS_FILE(dot11RTSFailureCount);
	DEBUGFS_DEVSTATS_FILE(dot11FCSErrorCount);
	DEBUGFS_DEVSTATS_FILE(dot11RTSSuccessCount);

	void debugfs_hw_add(struct ieee80211_local *local)
	{
	struct dentry *phyd = local->hw.wiphy->debugfsdir;
	struct dentry *statsd;

	if (!phyd)
	return;

	local->debugfs.keys = debugfs_create_dir("keys", phyd);

	DEBUGFS_ADD(total_ps_buffered);
	DEBUGFS_ADD(wep_iv);
	DEBUGFS_ADD(rate_ctrl_alg);
	DEBUGFS_ADD(queues);
	DEBUGFS_ADD(misc);
	#ifdef CONFIG_PM
	DEBUGFS_ADD_MODE(reset, 0200);
	#endif
	DEBUGFS_ADD(hwflags);
	DEBUGFS_ADD(user_power);
	DEBUGFS_ADD(power);

	if (local->ops->wake_tx_queue)
	DEBUGFS_ADD_MODE(aqm, 0600);

	statsd = debugfs_create_dir("statistics", phyd);

	/* if the dir failed, don't put all the other things into the root! */
	if (!statsd)
	return;

	#ifdef CONFIG_MAC80211_DEBUG_COUNTERS
	DEBUGFS_STATS_ADD(dot11TransmittedFragmentCount);
	DEBUGFS_STATS_ADD(dot11MulticastTransmittedFrameCount);
	DEBUGFS_STATS_ADD(dot11FailedCount);
	DEBUGFS_STATS_ADD(dot11RetryCount);
	DEBUGFS_STATS_ADD(dot11MultipleRetryCount);
	DEBUGFS_STATS_ADD(dot11FrameDuplicateCount);
	DEBUGFS_STATS_ADD(dot11ReceivedFragmentCount);
	DEBUGFS_STATS_ADD(dot11MulticastReceivedFrameCount);
	DEBUGFS_STATS_ADD(dot11TransmittedFrameCount);
	DEBUGFS_STATS_ADD(tx_handlers_drop);
	DEBUGFS_STATS_ADD(tx_handlers_queued);
	DEBUGFS_STATS_ADD(tx_handlers_drop_wep);
	DEBUGFS_STATS_ADD(tx_handlers_drop_not_assoc);
	DEBUGFS_STATS_ADD(tx_handlers_drop_unauth_port);
	DEBUGFS_STATS_ADD(rx_handlers_drop);
	DEBUGFS_STATS_ADD(rx_handlers_queued);
	DEBUGFS_STATS_ADD(rx_handlers_drop_nullfunc);
	DEBUGFS_STATS_ADD(rx_handlers_drop_defrag);
	DEBUGFS_STATS_ADD(tx_expand_skb_head);
	DEBUGFS_STATS_ADD(tx_expand_skb_head_cloned);
	DEBUGFS_STATS_ADD(rx_expand_skb_head_defrag);
	DEBUGFS_STATS_ADD(rx_handlers_fragments);
	DEBUGFS_STATS_ADD(tx_status_drop);
	#endif
	DEBUGFS_DEVSTATS_ADD(dot11ACKFailureCount);
	DEBUGFS_DEVSTATS_ADD(dot11RTSFailureCount);
	DEBUGFS_DEVSTATS_ADD(dot11FCSErrorCount);
	DEBUGFS_DEVSTATS_ADD(dot11RTSSuccessCount);
	}