debugfs.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * mac80211 debugfs for wireless PHYs
 *
 * Copyright 2007	Johannes Berg <johannes@sipsolutions.net>
 * Copyright 2013-2014  Intel Mobile Communications GmbH
 * Copyright (C) 2018 - 2019 Intel Corporation
 */

#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,
};

static ssize_t force_tx_status_read(struct file *file,
				    char __user *user_buf,
				    size_t count,
				    loff_t *ppos)
{
	struct ieee80211_local *local = file->private_data;
	char buf[3];
	int len = 0;

	len = scnprintf(buf, sizeof(buf), "%d\n", (int)local->force_tx_status);

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

static ssize_t force_tx_status_write(struct file *file,
				     const char __user *user_buf,
				     size_t count,
				     loff_t *ppos)
{
	struct ieee80211_local *local = file->private_data;
	char buf[3];
	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 (buf[0] == '0' && buf[1] == '\0')
		local->force_tx_status = 0;
	else if (buf[0] == '1' && buf[1] == '\0')
		local->force_tx_status = 1;
	else
		return -EINVAL;

	return count;
}

static const struct file_operations force_tx_status_ops = {
	.write = force_tx_status_write,
	.read = force_tx_status_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),
	FLAG(BUFF_MMPDU_TXQ),
	FLAG(SUPPORTS_VHT_EXT_NSS_BW),
	FLAG(STA_MMPDU_TXQ),
	FLAG(TX_STATUS_NO_AMPDU_LEN),
	FLAG(SUPPORTS_MULTI_BSSID),
	FLAG(SUPPORTS_ONLY_HE_MULTI_BSSID),
	FLAG(AMPDU_KEYBORDER_SUPPORT),
#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);
	DEBUGFS_ADD_MODE(force_tx_status, 0600);

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

	debugfs_create_u16("airtime_flags", 0600,
			   phyd, &local->airtime_flags);

	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);
}