Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 566 insertions, 0 deletions

diff --git a/net/mac80211/debugfs_sta.c b/net/mac80211/debugfs_sta.c
new file mode 100644
index 000000000..6f390c2e4
--- /dev/null
+++ b/net/mac80211/debugfs_sta.c
@@ -0,0 +1,566 @@
+/*
+ * Copyright 2003-2005	Devicescape Software, Inc.
+ * Copyright (c) 2006	Jiri Benc <jbenc@suse.cz>
+ * Copyright 2007	Johannes Berg <johannes@sipsolutions.net>
+ * Copyright 2013-2014  Intel Mobile Communications GmbH
+ * Copyright(c) 2016 Intel Deutschland GmbH
+ *
+ * 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/debugfs.h>
+#include <linux/ieee80211.h>
+#include "ieee80211_i.h"
+#include "debugfs.h"
+#include "debugfs_sta.h"
+#include "sta_info.h"
+#include "driver-ops.h"
+
+/* sta attributtes */
+
+#define STA_READ(name, field, format_string)				\
+static ssize_t sta_ ##name## _read(struct file *file,			\
+				   char __user *userbuf,		\
+				   size_t count, loff_t *ppos)		\
+{									\
+	struct sta_info *sta = file->private_data;			\
+	return mac80211_format_buffer(userbuf, count, ppos, 		\
+				      format_string, sta->field);	\
+}
+#define STA_READ_D(name, field) STA_READ(name, field, "%d\n")
+
+#define STA_OPS(name)							\
+static const struct file_operations sta_ ##name## _ops = {		\
+	.read = sta_##name##_read,					\
+	.open = simple_open,						\
+	.llseek = generic_file_llseek,					\
+}
+
+#define STA_OPS_RW(name)						\
+static const struct file_operations sta_ ##name## _ops = {		\
+	.read = sta_##name##_read,					\
+	.write = sta_##name##_write,					\
+	.open = simple_open,						\
+	.llseek = generic_file_llseek,					\
+}
+
+#define STA_FILE(name, field, format)					\
+		STA_READ_##format(name, field)				\
+		STA_OPS(name)
+
+STA_FILE(aid, sta.aid, D);
+
+static const char * const sta_flag_names[] = {
+#define FLAG(F) [WLAN_STA_##F] = #F
+	FLAG(AUTH),
+	FLAG(ASSOC),
+	FLAG(PS_STA),
+	FLAG(AUTHORIZED),
+	FLAG(SHORT_PREAMBLE),
+	FLAG(WDS),
+	FLAG(CLEAR_PS_FILT),
+	FLAG(MFP),
+	FLAG(BLOCK_BA),
+	FLAG(PS_DRIVER),
+	FLAG(PSPOLL),
+	FLAG(TDLS_PEER),
+	FLAG(TDLS_PEER_AUTH),
+	FLAG(TDLS_INITIATOR),
+	FLAG(TDLS_CHAN_SWITCH),
+	FLAG(TDLS_OFF_CHANNEL),
+	FLAG(TDLS_WIDER_BW),
+	FLAG(UAPSD),
+	FLAG(SP),
+	FLAG(4ADDR_EVENT),
+	FLAG(INSERTED),
+	FLAG(RATE_CONTROL),
+	FLAG(TOFFSET_KNOWN),
+	FLAG(MPSP_OWNER),
+	FLAG(MPSP_RECIPIENT),
+	FLAG(PS_DELIVER),
+	FLAG(USES_ENCRYPTION),
+#undef FLAG
+};
+
+static ssize_t sta_flags_read(struct file *file, char __user *userbuf,
+			      size_t count, loff_t *ppos)
+{
+	char buf[16 * NUM_WLAN_STA_FLAGS], *pos = buf;
+	char *end = buf + sizeof(buf) - 1;
+	struct sta_info *sta = file->private_data;
+	unsigned int flg;
+
+	BUILD_BUG_ON(ARRAY_SIZE(sta_flag_names) != NUM_WLAN_STA_FLAGS);
+
+	for (flg = 0; flg < NUM_WLAN_STA_FLAGS; flg++) {
+		if (test_sta_flag(sta, flg))
+			pos += scnprintf(pos, end - pos, "%s\n",
+					 sta_flag_names[flg]);
+	}
+
+	return simple_read_from_buffer(userbuf, count, ppos, buf, strlen(buf));
+}
+STA_OPS(flags);
+
+static ssize_t sta_num_ps_buf_frames_read(struct file *file,
+					  char __user *userbuf,
+					  size_t count, loff_t *ppos)
+{
+	struct sta_info *sta = file->private_data;
+	char buf[17*IEEE80211_NUM_ACS], *p = buf;
+	int ac;
+
+	for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
+		p += scnprintf(p, sizeof(buf)+buf-p, "AC%d: %d\n", ac,
+			       skb_queue_len(&sta->ps_tx_buf[ac]) +
+			       skb_queue_len(&sta->tx_filtered[ac]));
+	return simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
+}
+STA_OPS(num_ps_buf_frames);
+
+static ssize_t sta_last_seq_ctrl_read(struct file *file, char __user *userbuf,
+				      size_t count, loff_t *ppos)
+{
+	char buf[15*IEEE80211_NUM_TIDS], *p = buf;
+	int i;
+	struct sta_info *sta = file->private_data;
+	for (i = 0; i < IEEE80211_NUM_TIDS; i++)
+		p += scnprintf(p, sizeof(buf)+buf-p, "%x ",
+			       le16_to_cpu(sta->last_seq_ctrl[i]));
+	p += scnprintf(p, sizeof(buf)+buf-p, "\n");
+	return simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
+}
+STA_OPS(last_seq_ctrl);
+
+#define AQM_TXQ_ENTRY_LEN 130
+
+static ssize_t sta_aqm_read(struct file *file, char __user *userbuf,
+			size_t count, loff_t *ppos)
+{
+	struct sta_info *sta = file->private_data;
+	struct ieee80211_local *local = sta->local;
+	size_t bufsz = AQM_TXQ_ENTRY_LEN*(IEEE80211_NUM_TIDS+1);
+	char *buf = kzalloc(bufsz, GFP_KERNEL), *p = buf;
+	struct txq_info *txqi;
+	ssize_t rv;
+	int i;
+
+	if (!buf)
+		return -ENOMEM;
+
+	spin_lock_bh(&local->fq.lock);
+	rcu_read_lock();
+
+	p += scnprintf(p,
+		       bufsz+buf-p,
+		       "target %uus interval %uus ecn %s\n",
+		       codel_time_to_us(sta->cparams.target),
+		       codel_time_to_us(sta->cparams.interval),
+		       sta->cparams.ecn ? "yes" : "no");
+	p += scnprintf(p,
+		       bufsz+buf-p,
+		       "tid ac backlog-bytes backlog-packets new-flows drops marks overlimit collisions tx-bytes tx-packets flags\n");
+
+	for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
+		txqi = to_txq_info(sta->sta.txq[i]);
+		p += scnprintf(p, bufsz+buf-p,
+			       "%d %d %u %u %u %u %u %u %u %u %u 0x%lx(%s%s%s)\n",
+			       txqi->txq.tid,
+			       txqi->txq.ac,
+			       txqi->tin.backlog_bytes,
+			       txqi->tin.backlog_packets,
+			       txqi->tin.flows,
+			       txqi->cstats.drop_count,
+			       txqi->cstats.ecn_mark,
+			       txqi->tin.overlimit,
+			       txqi->tin.collisions,
+			       txqi->tin.tx_bytes,
+			       txqi->tin.tx_packets,
+			       txqi->flags,
+			       txqi->flags & (1<<IEEE80211_TXQ_STOP) ? "STOP" : "RUN",
+			       txqi->flags & (1<<IEEE80211_TXQ_AMPDU) ? " AMPDU" : "",
+			       txqi->flags & (1<<IEEE80211_TXQ_NO_AMSDU) ? " NO-AMSDU" : "");
+	}
+
+	rcu_read_unlock();
+	spin_unlock_bh(&local->fq.lock);
+
+	rv = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
+	kfree(buf);
+	return rv;
+}
+STA_OPS(aqm);
+
+static ssize_t sta_agg_status_read(struct file *file, char __user *userbuf,
+					size_t count, loff_t *ppos)
+{
+	char buf[71 + IEEE80211_NUM_TIDS * 40], *p = buf;
+	int i;
+	struct sta_info *sta = file->private_data;
+	struct tid_ampdu_rx *tid_rx;
+	struct tid_ampdu_tx *tid_tx;
+
+	rcu_read_lock();
+
+	p += scnprintf(p, sizeof(buf) + buf - p, "next dialog_token: %#02x\n",
+			sta->ampdu_mlme.dialog_token_allocator + 1);
+	p += scnprintf(p, sizeof(buf) + buf - p,
+		       "TID\t\tRX\tDTKN\tSSN\t\tTX\tDTKN\tpending\n");
+
+	for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
+		bool tid_rx_valid;
+
+		tid_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[i]);
+		tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[i]);
+		tid_rx_valid = test_bit(i, sta->ampdu_mlme.agg_session_valid);
+
+		p += scnprintf(p, sizeof(buf) + buf - p, "%02d", i);
+		p += scnprintf(p, sizeof(buf) + buf - p, "\t\t%x",
+			       tid_rx_valid);
+		p += scnprintf(p, sizeof(buf) + buf - p, "\t%#.2x",
+			       tid_rx_valid ?
+					sta->ampdu_mlme.tid_rx_token[i] : 0);
+		p += scnprintf(p, sizeof(buf) + buf - p, "\t%#.3x",
+				tid_rx ? tid_rx->ssn : 0);
+
+		p += scnprintf(p, sizeof(buf) + buf - p, "\t\t%x", !!tid_tx);
+		p += scnprintf(p, sizeof(buf) + buf - p, "\t%#.2x",
+				tid_tx ? tid_tx->dialog_token : 0);
+		p += scnprintf(p, sizeof(buf) + buf - p, "\t%03d",
+				tid_tx ? skb_queue_len(&tid_tx->pending) : 0);
+		p += scnprintf(p, sizeof(buf) + buf - p, "\n");
+	}
+	rcu_read_unlock();
+
+	return simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
+}
+
+static ssize_t sta_agg_status_write(struct file *file, const char __user *userbuf,
+				    size_t count, loff_t *ppos)
+{
+	char _buf[25] = {}, *buf = _buf;
+	struct sta_info *sta = file->private_data;
+	bool start, tx;
+	unsigned long tid;
+	char *pos;
+	int ret, timeout = 5000;
+
+	if (count > sizeof(_buf))
+		return -EINVAL;
+
+	if (copy_from_user(buf, userbuf, count))
+		return -EFAULT;
+
+	buf[sizeof(_buf) - 1] = '\0';
+	pos = buf;
+	buf = strsep(&pos, " ");
+	if (!buf)
+		return -EINVAL;
+
+	if (!strcmp(buf, "tx"))
+		tx = true;
+	else if (!strcmp(buf, "rx"))
+		tx = false;
+	else
+		return -EINVAL;
+
+	buf = strsep(&pos, " ");
+	if (!buf)
+		return -EINVAL;
+	if (!strcmp(buf, "start")) {
+		start = true;
+		if (!tx)
+			return -EINVAL;
+	} else if (!strcmp(buf, "stop")) {
+		start = false;
+	} else {
+		return -EINVAL;
+	}
+
+	buf = strsep(&pos, " ");
+	if (!buf)
+		return -EINVAL;
+	if (sscanf(buf, "timeout=%d", &timeout) == 1) {
+		buf = strsep(&pos, " ");
+		if (!buf || !tx || !start)
+			return -EINVAL;
+	}
+
+	ret = kstrtoul(buf, 0, &tid);
+	if (ret || tid >= IEEE80211_NUM_TIDS)
+		return -EINVAL;
+
+	if (tx) {
+		if (start)
+			ret = ieee80211_start_tx_ba_session(&sta->sta, tid,
+							    timeout);
+		else
+			ret = ieee80211_stop_tx_ba_session(&sta->sta, tid);
+	} else {
+		__ieee80211_stop_rx_ba_session(sta, tid, WLAN_BACK_RECIPIENT,
+					       3, true);
+		ret = 0;
+	}
+
+	return ret ?: count;
+}
+STA_OPS_RW(agg_status);
+
+static ssize_t sta_ht_capa_read(struct file *file, char __user *userbuf,
+				size_t count, loff_t *ppos)
+{
+#define PRINT_HT_CAP(_cond, _str) \
+	do { \
+	if (_cond) \
+			p += scnprintf(p, sizeof(buf)+buf-p, "\t" _str "\n"); \
+	} while (0)
+	char buf[512], *p = buf;
+	int i;
+	struct sta_info *sta = file->private_data;
+	struct ieee80211_sta_ht_cap *htc = &sta->sta.ht_cap;
+
+	p += scnprintf(p, sizeof(buf) + buf - p, "ht %ssupported\n",
+			htc->ht_supported ? "" : "not ");
+	if (htc->ht_supported) {
+		p += scnprintf(p, sizeof(buf)+buf-p, "cap: %#.4x\n", htc->cap);
+
+		PRINT_HT_CAP((htc->cap & BIT(0)), "RX LDPC");
+		PRINT_HT_CAP((htc->cap & BIT(1)), "HT20/HT40");
+		PRINT_HT_CAP(!(htc->cap & BIT(1)), "HT20");
+
+		PRINT_HT_CAP(((htc->cap >> 2) & 0x3) == 0, "Static SM Power Save");
+		PRINT_HT_CAP(((htc->cap >> 2) & 0x3) == 1, "Dynamic SM Power Save");
+		PRINT_HT_CAP(((htc->cap >> 2) & 0x3) == 3, "SM Power Save disabled");
+
+		PRINT_HT_CAP((htc->cap & BIT(4)), "RX Greenfield");
+		PRINT_HT_CAP((htc->cap & BIT(5)), "RX HT20 SGI");
+		PRINT_HT_CAP((htc->cap & BIT(6)), "RX HT40 SGI");
+		PRINT_HT_CAP((htc->cap & BIT(7)), "TX STBC");
+
+		PRINT_HT_CAP(((htc->cap >> 8) & 0x3) == 0, "No RX STBC");
+		PRINT_HT_CAP(((htc->cap >> 8) & 0x3) == 1, "RX STBC 1-stream");
+		PRINT_HT_CAP(((htc->cap >> 8) & 0x3) == 2, "RX STBC 2-streams");
+		PRINT_HT_CAP(((htc->cap >> 8) & 0x3) == 3, "RX STBC 3-streams");
+
+		PRINT_HT_CAP((htc->cap & BIT(10)), "HT Delayed Block Ack");
+
+		PRINT_HT_CAP(!(htc->cap & BIT(11)), "Max AMSDU length: "
+			     "3839 bytes");
+		PRINT_HT_CAP((htc->cap & BIT(11)), "Max AMSDU length: "
+			     "7935 bytes");
+
+		/*
+		 * For beacons and probe response this would mean the BSS
+		 * does or does not allow the usage of DSSS/CCK HT40.
+		 * Otherwise it means the STA does or does not use
+		 * DSSS/CCK HT40.
+		 */
+		PRINT_HT_CAP((htc->cap & BIT(12)), "DSSS/CCK HT40");
+		PRINT_HT_CAP(!(htc->cap & BIT(12)), "No DSSS/CCK HT40");
+
+		/* BIT(13) is reserved */
+
+		PRINT_HT_CAP((htc->cap & BIT(14)), "40 MHz Intolerant");
+
+		PRINT_HT_CAP((htc->cap & BIT(15)), "L-SIG TXOP protection");
+
+		p += scnprintf(p, sizeof(buf)+buf-p, "ampdu factor/density: %d/%d\n",
+				htc->ampdu_factor, htc->ampdu_density);
+		p += scnprintf(p, sizeof(buf)+buf-p, "MCS mask:");
+
+		for (i = 0; i < IEEE80211_HT_MCS_MASK_LEN; i++)
+			p += scnprintf(p, sizeof(buf)+buf-p, " %.2x",
+					htc->mcs.rx_mask[i]);
+		p += scnprintf(p, sizeof(buf)+buf-p, "\n");
+
+		/* If not set this is meaningless */
+		if (le16_to_cpu(htc->mcs.rx_highest)) {
+			p += scnprintf(p, sizeof(buf)+buf-p,
+				       "MCS rx highest: %d Mbps\n",
+				       le16_to_cpu(htc->mcs.rx_highest));
+		}
+
+		p += scnprintf(p, sizeof(buf)+buf-p, "MCS tx params: %x\n",
+				htc->mcs.tx_params);
+	}
+
+	return simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
+}
+STA_OPS(ht_capa);
+
+static ssize_t sta_vht_capa_read(struct file *file, char __user *userbuf,
+				 size_t count, loff_t *ppos)
+{
+	char buf[512], *p = buf;
+	struct sta_info *sta = file->private_data;
+	struct ieee80211_sta_vht_cap *vhtc = &sta->sta.vht_cap;
+
+	p += scnprintf(p, sizeof(buf) + buf - p, "VHT %ssupported\n",
+			vhtc->vht_supported ? "" : "not ");
+	if (vhtc->vht_supported) {
+		p += scnprintf(p, sizeof(buf) + buf - p, "cap: %#.8x\n",
+			       vhtc->cap);
+#define PFLAG(a, b)							\
+		do {							\
+			if (vhtc->cap & IEEE80211_VHT_CAP_ ## a)	\
+				p += scnprintf(p, sizeof(buf) + buf - p, \
+					       "\t\t%s\n", b);		\
+		} while (0)
+
+		switch (vhtc->cap & 0x3) {
+		case IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_3895:
+			p += scnprintf(p, sizeof(buf) + buf - p,
+				       "\t\tMAX-MPDU-3895\n");
+			break;
+		case IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_7991:
+			p += scnprintf(p, sizeof(buf) + buf - p,
+				       "\t\tMAX-MPDU-7991\n");
+			break;
+		case IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_11454:
+			p += scnprintf(p, sizeof(buf) + buf - p,
+				       "\t\tMAX-MPDU-11454\n");
+			break;
+		default:
+			p += scnprintf(p, sizeof(buf) + buf - p,
+				       "\t\tMAX-MPDU-UNKNOWN\n");
+		}
+		switch (vhtc->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK) {
+		case 0:
+			p += scnprintf(p, sizeof(buf) + buf - p,
+				       "\t\t80Mhz\n");
+			break;
+		case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ:
+			p += scnprintf(p, sizeof(buf) + buf - p,
+				       "\t\t160Mhz\n");
+			break;
+		case IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ:
+			p += scnprintf(p, sizeof(buf) + buf - p,
+				       "\t\t80+80Mhz\n");
+			break;
+		default:
+			p += scnprintf(p, sizeof(buf) + buf - p,
+				       "\t\tUNKNOWN-MHZ: 0x%x\n",
+				       (vhtc->cap >> 2) & 0x3);
+		}
+		PFLAG(RXLDPC, "RXLDPC");
+		PFLAG(SHORT_GI_80, "SHORT-GI-80");
+		PFLAG(SHORT_GI_160, "SHORT-GI-160");
+		PFLAG(TXSTBC, "TXSTBC");
+		p += scnprintf(p, sizeof(buf) + buf - p,
+			       "\t\tRXSTBC_%d\n", (vhtc->cap >> 8) & 0x7);
+		PFLAG(SU_BEAMFORMER_CAPABLE, "SU-BEAMFORMER-CAPABLE");
+		PFLAG(SU_BEAMFORMEE_CAPABLE, "SU-BEAMFORMEE-CAPABLE");
+		p += scnprintf(p, sizeof(buf) + buf - p,
+			"\t\tBEAMFORMEE-STS: 0x%x\n",
+			(vhtc->cap & IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK) >>
+			IEEE80211_VHT_CAP_BEAMFORMEE_STS_SHIFT);
+		p += scnprintf(p, sizeof(buf) + buf - p,
+			"\t\tSOUNDING-DIMENSIONS: 0x%x\n",
+			(vhtc->cap & IEEE80211_VHT_CAP_SOUNDING_DIMENSIONS_MASK)
+			>> IEEE80211_VHT_CAP_SOUNDING_DIMENSIONS_SHIFT);
+		PFLAG(MU_BEAMFORMER_CAPABLE, "MU-BEAMFORMER-CAPABLE");
+		PFLAG(MU_BEAMFORMEE_CAPABLE, "MU-BEAMFORMEE-CAPABLE");
+		PFLAG(VHT_TXOP_PS, "TXOP-PS");
+		PFLAG(HTC_VHT, "HTC-VHT");
+		p += scnprintf(p, sizeof(buf) + buf - p,
+			"\t\tMPDU-LENGTH-EXPONENT: 0x%x\n",
+			(vhtc->cap & IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK) >>
+			IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_SHIFT);
+		PFLAG(VHT_LINK_ADAPTATION_VHT_UNSOL_MFB,
+		      "LINK-ADAPTATION-VHT-UNSOL-MFB");
+		p += scnprintf(p, sizeof(buf) + buf - p,
+			"\t\tLINK-ADAPTATION-VHT-MRQ-MFB: 0x%x\n",
+			(vhtc->cap & IEEE80211_VHT_CAP_VHT_LINK_ADAPTATION_VHT_MRQ_MFB) >> 26);
+		PFLAG(RX_ANTENNA_PATTERN, "RX-ANTENNA-PATTERN");
+		PFLAG(TX_ANTENNA_PATTERN, "TX-ANTENNA-PATTERN");
+
+		p += scnprintf(p, sizeof(buf)+buf-p, "RX MCS: %.4x\n",
+			       le16_to_cpu(vhtc->vht_mcs.rx_mcs_map));
+		if (vhtc->vht_mcs.rx_highest)
+			p += scnprintf(p, sizeof(buf)+buf-p,
+				       "MCS RX highest: %d Mbps\n",
+				       le16_to_cpu(vhtc->vht_mcs.rx_highest));
+		p += scnprintf(p, sizeof(buf)+buf-p, "TX MCS: %.4x\n",
+			       le16_to_cpu(vhtc->vht_mcs.tx_mcs_map));
+		if (vhtc->vht_mcs.tx_highest)
+			p += scnprintf(p, sizeof(buf)+buf-p,
+				       "MCS TX highest: %d Mbps\n",
+				       le16_to_cpu(vhtc->vht_mcs.tx_highest));
+	}
+
+	return simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
+}
+STA_OPS(vht_capa);
+
+
+#define DEBUGFS_ADD(name) \
+	debugfs_create_file(#name, 0400, \
+		sta->debugfs_dir, sta, &sta_ ##name## _ops);
+
+#define DEBUGFS_ADD_COUNTER(name, field)				\
+	if (sizeof(sta->field) == sizeof(u32))				\
+		debugfs_create_u32(#name, 0400, sta->debugfs_dir,	\
+			(u32 *) &sta->field);				\
+	else								\
+		debugfs_create_u64(#name, 0400, sta->debugfs_dir,	\
+			(u64 *) &sta->field);
+
+void ieee80211_sta_debugfs_add(struct sta_info *sta)
+{
+	struct ieee80211_local *local = sta->local;
+	struct ieee80211_sub_if_data *sdata = sta->sdata;
+	struct dentry *stations_dir = sta->sdata->debugfs.subdir_stations;
+	u8 mac[3*ETH_ALEN];
+
+	if (!stations_dir)
+		return;
+
+	snprintf(mac, sizeof(mac), "%pM", sta->sta.addr);
+
+	/*
+	 * This might fail due to a race condition:
+	 * When mac80211 unlinks a station, the debugfs entries
+	 * remain, but it is already possible to link a new
+	 * station with the same address which triggers adding
+	 * it to debugfs; therefore, if the old station isn't
+	 * destroyed quickly enough the old station's debugfs
+	 * dir might still be around.
+	 */
+	sta->debugfs_dir = debugfs_create_dir(mac, stations_dir);
+	if (!sta->debugfs_dir)
+		return;
+
+	DEBUGFS_ADD(flags);
+	DEBUGFS_ADD(aid);
+	DEBUGFS_ADD(num_ps_buf_frames);
+	DEBUGFS_ADD(last_seq_ctrl);
+	DEBUGFS_ADD(agg_status);
+	DEBUGFS_ADD(ht_capa);
+	DEBUGFS_ADD(vht_capa);
+
+	DEBUGFS_ADD_COUNTER(rx_duplicates, rx_stats.num_duplicates);
+	DEBUGFS_ADD_COUNTER(rx_fragments, rx_stats.fragments);
+	DEBUGFS_ADD_COUNTER(tx_filtered, status_stats.filtered);
+
+	if (local->ops->wake_tx_queue)
+		DEBUGFS_ADD(aqm);
+
+	if (sizeof(sta->driver_buffered_tids) == sizeof(u32))
+		debugfs_create_x32("driver_buffered_tids", 0400,
+				   sta->debugfs_dir,
+				   (u32 *)&sta->driver_buffered_tids);
+	else
+		debugfs_create_x64("driver_buffered_tids", 0400,
+				   sta->debugfs_dir,
+				   (u64 *)&sta->driver_buffered_tids);
+
+	drv_sta_add_debugfs(local, sdata, &sta->sta, sta->debugfs_dir);
+}
+
+void ieee80211_sta_debugfs_remove(struct sta_info *sta)
+{
+	debugfs_remove_recursive(sta->debugfs_dir);
+	sta->debugfs_dir = NULL;
+}