Adding upstream version 4.19.249.upstream/4.19.249upstream

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

1 files changed, 2411 insertions, 0 deletions

diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c
new file mode 100644
index 000000000..3a907ba7f
--- /dev/null
+++ b/net/mac80211/sta_info.c
@@ -0,0 +1,2411 @@
+/*
+ * Copyright 2002-2005, Instant802 Networks, Inc.
+ * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
+ * Copyright 2013-2014  Intel Mobile Communications GmbH
+ * Copyright (C) 2015 - 2017 Intel Deutschland GmbH
+ * Copyright (C) 2018-2021 Intel Corporation
+ *
+ * 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/module.h>
+#include <linux/init.h>
+#include <linux/etherdevice.h>
+#include <linux/netdevice.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/skbuff.h>
+#include <linux/if_arp.h>
+#include <linux/timer.h>
+#include <linux/rtnetlink.h>
+
+#include <net/codel.h>
+#include <net/mac80211.h>
+#include "ieee80211_i.h"
+#include "driver-ops.h"
+#include "rate.h"
+#include "sta_info.h"
+#include "debugfs_sta.h"
+#include "mesh.h"
+#include "wme.h"
+
+/**
+ * DOC: STA information lifetime rules
+ *
+ * STA info structures (&struct sta_info) are managed in a hash table
+ * for faster lookup and a list for iteration. They are managed using
+ * RCU, i.e. access to the list and hash table is protected by RCU.
+ *
+ * Upon allocating a STA info structure with sta_info_alloc(), the caller
+ * owns that structure. It must then insert it into the hash table using
+ * either sta_info_insert() or sta_info_insert_rcu(); only in the latter
+ * case (which acquires an rcu read section but must not be called from
+ * within one) will the pointer still be valid after the call. Note that
+ * the caller may not do much with the STA info before inserting it, in
+ * particular, it may not start any mesh peer link management or add
+ * encryption keys.
+ *
+ * When the insertion fails (sta_info_insert()) returns non-zero), the
+ * structure will have been freed by sta_info_insert()!
+ *
+ * Station entries are added by mac80211 when you establish a link with a
+ * peer. This means different things for the different type of interfaces
+ * we support. For a regular station this mean we add the AP sta when we
+ * receive an association response from the AP. For IBSS this occurs when
+ * get to know about a peer on the same IBSS. For WDS we add the sta for
+ * the peer immediately upon device open. When using AP mode we add stations
+ * for each respective station upon request from userspace through nl80211.
+ *
+ * In order to remove a STA info structure, various sta_info_destroy_*()
+ * calls are available.
+ *
+ * There is no concept of ownership on a STA entry, each structure is
+ * owned by the global hash table/list until it is removed. All users of
+ * the structure need to be RCU protected so that the structure won't be
+ * freed before they are done using it.
+ */
+
+static const struct rhashtable_params sta_rht_params = {
+	.nelem_hint = 3, /* start small */
+	.automatic_shrinking = true,
+	.head_offset = offsetof(struct sta_info, hash_node),
+	.key_offset = offsetof(struct sta_info, addr),
+	.key_len = ETH_ALEN,
+	.max_size = CONFIG_MAC80211_STA_HASH_MAX_SIZE,
+};
+
+/* Caller must hold local->sta_mtx */
+static int sta_info_hash_del(struct ieee80211_local *local,
+			     struct sta_info *sta)
+{
+	return rhltable_remove(&local->sta_hash, &sta->hash_node,
+			       sta_rht_params);
+}
+
+static void __cleanup_single_sta(struct sta_info *sta)
+{
+	int ac, i;
+	struct tid_ampdu_tx *tid_tx;
+	struct ieee80211_sub_if_data *sdata = sta->sdata;
+	struct ieee80211_local *local = sdata->local;
+	struct fq *fq = &local->fq;
+	struct ps_data *ps;
+
+	if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
+	    test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
+	    test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
+		if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
+		    sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
+			ps = &sdata->bss->ps;
+		else if (ieee80211_vif_is_mesh(&sdata->vif))
+			ps = &sdata->u.mesh.ps;
+		else
+			return;
+
+		clear_sta_flag(sta, WLAN_STA_PS_STA);
+		clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
+		clear_sta_flag(sta, WLAN_STA_PS_DELIVER);
+
+		atomic_dec(&ps->num_sta_ps);
+	}
+
+	if (sta->sta.txq[0]) {
+		for (i = 0; i < ARRAY_SIZE(sta->sta.txq); i++) {
+			struct txq_info *txqi = to_txq_info(sta->sta.txq[i]);
+
+			spin_lock_bh(&fq->lock);
+			ieee80211_txq_purge(local, txqi);
+			spin_unlock_bh(&fq->lock);
+		}
+	}
+
+	for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
+		local->total_ps_buffered -= skb_queue_len(&sta->ps_tx_buf[ac]);
+		ieee80211_purge_tx_queue(&local->hw, &sta->ps_tx_buf[ac]);
+		ieee80211_purge_tx_queue(&local->hw, &sta->tx_filtered[ac]);
+	}
+
+	if (ieee80211_vif_is_mesh(&sdata->vif))
+		mesh_sta_cleanup(sta);
+
+	cancel_work_sync(&sta->drv_deliver_wk);
+
+	/*
+	 * Destroy aggregation state here. It would be nice to wait for the
+	 * driver to finish aggregation stop and then clean up, but for now
+	 * drivers have to handle aggregation stop being requested, followed
+	 * directly by station destruction.
+	 */
+	for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
+		kfree(sta->ampdu_mlme.tid_start_tx[i]);
+		tid_tx = rcu_dereference_raw(sta->ampdu_mlme.tid_tx[i]);
+		if (!tid_tx)
+			continue;
+		ieee80211_purge_tx_queue(&local->hw, &tid_tx->pending);
+		kfree(tid_tx);
+	}
+}
+
+static void cleanup_single_sta(struct sta_info *sta)
+{
+	struct ieee80211_sub_if_data *sdata = sta->sdata;
+	struct ieee80211_local *local = sdata->local;
+
+	__cleanup_single_sta(sta);
+	sta_info_free(local, sta);
+}
+
+struct rhlist_head *sta_info_hash_lookup(struct ieee80211_local *local,
+					 const u8 *addr)
+{
+	return rhltable_lookup(&local->sta_hash, addr, sta_rht_params);
+}
+
+/* protected by RCU */
+struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
+			      const u8 *addr)
+{
+	struct ieee80211_local *local = sdata->local;
+	struct rhlist_head *tmp;
+	struct sta_info *sta;
+
+	rcu_read_lock();
+	for_each_sta_info(local, addr, sta, tmp) {
+		if (sta->sdata == sdata) {
+			rcu_read_unlock();
+			/* this is safe as the caller must already hold
+			 * another rcu read section or the mutex
+			 */
+			return sta;
+		}
+	}
+	rcu_read_unlock();
+	return NULL;
+}
+
+/*
+ * Get sta info either from the specified interface
+ * or from one of its vlans
+ */
+struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
+				  const u8 *addr)
+{
+	struct ieee80211_local *local = sdata->local;
+	struct rhlist_head *tmp;
+	struct sta_info *sta;
+
+	rcu_read_lock();
+	for_each_sta_info(local, addr, sta, tmp) {
+		if (sta->sdata == sdata ||
+		    (sta->sdata->bss && sta->sdata->bss == sdata->bss)) {
+			rcu_read_unlock();
+			/* this is safe as the caller must already hold
+			 * another rcu read section or the mutex
+			 */
+			return sta;
+		}
+	}
+	rcu_read_unlock();
+	return NULL;
+}
+
+struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
+				     int idx)
+{
+	struct ieee80211_local *local = sdata->local;
+	struct sta_info *sta;
+	int i = 0;
+
+	list_for_each_entry_rcu(sta, &local->sta_list, list) {
+		if (sdata != sta->sdata)
+			continue;
+		if (i < idx) {
+			++i;
+			continue;
+		}
+		return sta;
+	}
+
+	return NULL;
+}
+
+/**
+ * sta_info_free - free STA
+ *
+ * @local: pointer to the global information
+ * @sta: STA info to free
+ *
+ * This function must undo everything done by sta_info_alloc()
+ * that may happen before sta_info_insert(). It may only be
+ * called when sta_info_insert() has not been attempted (and
+ * if that fails, the station is freed anyway.)
+ */
+void sta_info_free(struct ieee80211_local *local, struct sta_info *sta)
+{
+	/*
+	 * If we had used sta_info_pre_move_state() then we might not
+	 * have gone through the state transitions down again, so do
+	 * it here now (and warn if it's inserted).
+	 *
+	 * This will clear state such as fast TX/RX that may have been
+	 * allocated during state transitions.
+	 */
+	while (sta->sta_state > IEEE80211_STA_NONE) {
+		int ret;
+
+		WARN_ON_ONCE(test_sta_flag(sta, WLAN_STA_INSERTED));
+
+		ret = sta_info_move_state(sta, sta->sta_state - 1);
+		if (WARN_ONCE(ret, "sta_info_move_state() returned %d\n", ret))
+			break;
+	}
+
+	if (sta->rate_ctrl)
+		rate_control_free_sta(sta);
+
+	sta_dbg(sta->sdata, "Destroyed STA %pM\n", sta->sta.addr);
+
+	if (sta->sta.txq[0])
+		kfree(to_txq_info(sta->sta.txq[0]));
+	kfree(rcu_dereference_raw(sta->sta.rates));
+#ifdef CONFIG_MAC80211_MESH
+	kfree(sta->mesh);
+#endif
+	free_percpu(sta->pcpu_rx_stats);
+	kfree(sta);
+}
+
+/* Caller must hold local->sta_mtx */
+static int sta_info_hash_add(struct ieee80211_local *local,
+			     struct sta_info *sta)
+{
+	return rhltable_insert(&local->sta_hash, &sta->hash_node,
+			       sta_rht_params);
+}
+
+static void sta_deliver_ps_frames(struct work_struct *wk)
+{
+	struct sta_info *sta;
+
+	sta = container_of(wk, struct sta_info, drv_deliver_wk);
+
+	if (sta->dead)
+		return;
+
+	local_bh_disable();
+	if (!test_sta_flag(sta, WLAN_STA_PS_STA))
+		ieee80211_sta_ps_deliver_wakeup(sta);
+	else if (test_and_clear_sta_flag(sta, WLAN_STA_PSPOLL))
+		ieee80211_sta_ps_deliver_poll_response(sta);
+	else if (test_and_clear_sta_flag(sta, WLAN_STA_UAPSD))
+		ieee80211_sta_ps_deliver_uapsd(sta);
+	local_bh_enable();
+}
+
+static int sta_prepare_rate_control(struct ieee80211_local *local,
+				    struct sta_info *sta, gfp_t gfp)
+{
+	if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL))
+		return 0;
+
+	sta->rate_ctrl = local->rate_ctrl;
+	sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl,
+						     sta, gfp);
+	if (!sta->rate_ctrl_priv)
+		return -ENOMEM;
+
+	return 0;
+}
+
+struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
+				const u8 *addr, gfp_t gfp)
+{
+	struct ieee80211_local *local = sdata->local;
+	struct ieee80211_hw *hw = &local->hw;
+	struct sta_info *sta;
+	int i;
+
+	sta = kzalloc(sizeof(*sta) + hw->sta_data_size, gfp);
+	if (!sta)
+		return NULL;
+
+	if (ieee80211_hw_check(hw, USES_RSS)) {
+		sta->pcpu_rx_stats =
+			alloc_percpu_gfp(struct ieee80211_sta_rx_stats, gfp);
+		if (!sta->pcpu_rx_stats)
+			goto free;
+	}
+
+	spin_lock_init(&sta->lock);
+	spin_lock_init(&sta->ps_lock);
+	INIT_WORK(&sta->drv_deliver_wk, sta_deliver_ps_frames);
+	INIT_WORK(&sta->ampdu_mlme.work, ieee80211_ba_session_work);
+	mutex_init(&sta->ampdu_mlme.mtx);
+#ifdef CONFIG_MAC80211_MESH
+	if (ieee80211_vif_is_mesh(&sdata->vif)) {
+		sta->mesh = kzalloc(sizeof(*sta->mesh), gfp);
+		if (!sta->mesh)
+			goto free;
+		sta->mesh->plink_sta = sta;
+		spin_lock_init(&sta->mesh->plink_lock);
+		if (ieee80211_vif_is_mesh(&sdata->vif) &&
+		    !sdata->u.mesh.user_mpm)
+			timer_setup(&sta->mesh->plink_timer, mesh_plink_timer,
+				    0);
+		sta->mesh->nonpeer_pm = NL80211_MESH_POWER_ACTIVE;
+	}
+#endif
+
+	memcpy(sta->addr, addr, ETH_ALEN);
+	memcpy(sta->sta.addr, addr, ETH_ALEN);
+	sta->sta.max_rx_aggregation_subframes =
+		local->hw.max_rx_aggregation_subframes;
+
+	sta->local = local;
+	sta->sdata = sdata;
+	sta->rx_stats.last_rx = jiffies;
+
+	u64_stats_init(&sta->rx_stats.syncp);
+
+	ieee80211_init_frag_cache(&sta->frags);
+
+	sta->sta_state = IEEE80211_STA_NONE;
+
+	/* Mark TID as unreserved */
+	sta->reserved_tid = IEEE80211_TID_UNRESERVED;
+
+	sta->last_connected = ktime_get_seconds();
+	ewma_signal_init(&sta->rx_stats_avg.signal);
+	ewma_avg_signal_init(&sta->status_stats.avg_ack_signal);
+	for (i = 0; i < ARRAY_SIZE(sta->rx_stats_avg.chain_signal); i++)
+		ewma_signal_init(&sta->rx_stats_avg.chain_signal[i]);
+
+	if (local->ops->wake_tx_queue) {
+		void *txq_data;
+		int size = sizeof(struct txq_info) +
+			   ALIGN(hw->txq_data_size, sizeof(void *));
+
+		txq_data = kcalloc(ARRAY_SIZE(sta->sta.txq), size, gfp);
+		if (!txq_data)
+			goto free;
+
+		for (i = 0; i < ARRAY_SIZE(sta->sta.txq); i++) {
+			struct txq_info *txq = txq_data + i * size;
+
+			ieee80211_txq_init(sdata, sta, txq, i);
+		}
+	}
+
+	if (sta_prepare_rate_control(local, sta, gfp))
+		goto free_txq;
+
+	for (i = 0; i < IEEE80211_NUM_ACS; i++) {
+		skb_queue_head_init(&sta->ps_tx_buf[i]);
+		skb_queue_head_init(&sta->tx_filtered[i]);
+	}
+
+	for (i = 0; i < IEEE80211_NUM_TIDS; i++)
+		sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX);
+
+	sta->sta.smps_mode = IEEE80211_SMPS_OFF;
+	if (sdata->vif.type == NL80211_IFTYPE_AP ||
+	    sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
+		struct ieee80211_supported_band *sband;
+		u8 smps;
+
+		sband = ieee80211_get_sband(sdata);
+		if (!sband)
+			goto free_txq;
+
+		smps = (sband->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >>
+			IEEE80211_HT_CAP_SM_PS_SHIFT;
+		/*
+		 * Assume that hostapd advertises our caps in the beacon and
+		 * this is the known_smps_mode for a station that just assciated
+		 */
+		switch (smps) {
+		case WLAN_HT_SMPS_CONTROL_DISABLED:
+			sta->known_smps_mode = IEEE80211_SMPS_OFF;
+			break;
+		case WLAN_HT_SMPS_CONTROL_STATIC:
+			sta->known_smps_mode = IEEE80211_SMPS_STATIC;
+			break;
+		case WLAN_HT_SMPS_CONTROL_DYNAMIC:
+			sta->known_smps_mode = IEEE80211_SMPS_DYNAMIC;
+			break;
+		default:
+			WARN_ON(1);
+		}
+	}
+
+	sta->sta.max_rc_amsdu_len = IEEE80211_MAX_MPDU_LEN_HT_BA;
+
+	sta->cparams.ce_threshold = CODEL_DISABLED_THRESHOLD;
+	sta->cparams.target = MS2TIME(20);
+	sta->cparams.interval = MS2TIME(100);
+	sta->cparams.ecn = true;
+
+	sta_dbg(sdata, "Allocated STA %pM\n", sta->sta.addr);
+
+	return sta;
+
+free_txq:
+	if (sta->sta.txq[0])
+		kfree(to_txq_info(sta->sta.txq[0]));
+free:
+	free_percpu(sta->pcpu_rx_stats);
+#ifdef CONFIG_MAC80211_MESH
+	kfree(sta->mesh);
+#endif
+	kfree(sta);
+	return NULL;
+}
+
+static int sta_info_insert_check(struct sta_info *sta)
+{
+	struct ieee80211_sub_if_data *sdata = sta->sdata;
+
+	/*
+	 * Can't be a WARN_ON because it can be triggered through a race:
+	 * something inserts a STA (on one CPU) without holding the RTNL
+	 * and another CPU turns off the net device.
+	 */
+	if (unlikely(!ieee80211_sdata_running(sdata)))
+		return -ENETDOWN;
+
+	if (WARN_ON(ether_addr_equal(sta->sta.addr, sdata->vif.addr) ||
+		    is_multicast_ether_addr(sta->sta.addr)))
+		return -EINVAL;
+
+	/* The RCU read lock is required by rhashtable due to
+	 * asynchronous resize/rehash.  We also require the mutex
+	 * for correctness.
+	 */
+	rcu_read_lock();
+	lockdep_assert_held(&sdata->local->sta_mtx);
+	if (ieee80211_hw_check(&sdata->local->hw, NEEDS_UNIQUE_STA_ADDR) &&
+	    ieee80211_find_sta_by_ifaddr(&sdata->local->hw, sta->addr, NULL)) {
+		rcu_read_unlock();
+		return -ENOTUNIQ;
+	}
+	rcu_read_unlock();
+
+	return 0;
+}
+
+static int sta_info_insert_drv_state(struct ieee80211_local *local,
+				     struct ieee80211_sub_if_data *sdata,
+				     struct sta_info *sta)
+{
+	enum ieee80211_sta_state state;
+	int err = 0;
+
+	for (state = IEEE80211_STA_NOTEXIST; state < sta->sta_state; state++) {
+		err = drv_sta_state(local, sdata, sta, state, state + 1);
+		if (err)
+			break;
+	}
+
+	if (!err) {
+		/*
+		 * Drivers using legacy sta_add/sta_remove callbacks only
+		 * get uploaded set to true after sta_add is called.
+		 */
+		if (!local->ops->sta_add)
+			sta->uploaded = true;
+		return 0;
+	}
+
+	if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
+		sdata_info(sdata,
+			   "failed to move IBSS STA %pM to state %d (%d) - keeping it anyway\n",
+			   sta->sta.addr, state + 1, err);
+		err = 0;
+	}
+
+	/* unwind on error */
+	for (; state > IEEE80211_STA_NOTEXIST; state--)
+		WARN_ON(drv_sta_state(local, sdata, sta, state, state - 1));
+
+	return err;
+}
+
+static void
+ieee80211_recalc_p2p_go_ps_allowed(struct ieee80211_sub_if_data *sdata)
+{
+	struct ieee80211_local *local = sdata->local;
+	bool allow_p2p_go_ps = sdata->vif.p2p;
+	struct sta_info *sta;
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(sta, &local->sta_list, list) {
+		if (sdata != sta->sdata ||
+		    !test_sta_flag(sta, WLAN_STA_ASSOC))
+			continue;
+		if (!sta->sta.support_p2p_ps) {
+			allow_p2p_go_ps = false;
+			break;
+		}
+	}
+	rcu_read_unlock();
+
+	if (allow_p2p_go_ps != sdata->vif.bss_conf.allow_p2p_go_ps) {
+		sdata->vif.bss_conf.allow_p2p_go_ps = allow_p2p_go_ps;
+		ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_P2P_PS);
+	}
+}
+
+/*
+ * should be called with sta_mtx locked
+ * this function replaces the mutex lock
+ * with a RCU lock
+ */
+static int sta_info_insert_finish(struct sta_info *sta) __acquires(RCU)
+{
+	struct ieee80211_local *local = sta->local;
+	struct ieee80211_sub_if_data *sdata = sta->sdata;
+	struct station_info *sinfo = NULL;
+	int err = 0;
+
+	lockdep_assert_held(&local->sta_mtx);
+
+	/* check if STA exists already */
+	if (sta_info_get_bss(sdata, sta->sta.addr)) {
+		err = -EEXIST;
+		goto out_err;
+	}
+
+	sinfo = kzalloc(sizeof(struct station_info), GFP_KERNEL);
+	if (!sinfo) {
+		err = -ENOMEM;
+		goto out_err;
+	}
+
+	local->num_sta++;
+	local->sta_generation++;
+	smp_mb();
+
+	/* simplify things and don't accept BA sessions yet */
+	set_sta_flag(sta, WLAN_STA_BLOCK_BA);
+
+	/* make the station visible */
+	err = sta_info_hash_add(local, sta);
+	if (err)
+		goto out_drop_sta;
+
+	list_add_tail_rcu(&sta->list, &local->sta_list);
+
+	/* notify driver */
+	err = sta_info_insert_drv_state(local, sdata, sta);
+	if (err)
+		goto out_remove;
+
+	set_sta_flag(sta, WLAN_STA_INSERTED);
+
+	if (sta->sta_state >= IEEE80211_STA_ASSOC) {
+		ieee80211_recalc_min_chandef(sta->sdata);
+		if (!sta->sta.support_p2p_ps)
+			ieee80211_recalc_p2p_go_ps_allowed(sta->sdata);
+	}
+
+	/* accept BA sessions now */
+	clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
+
+	ieee80211_sta_debugfs_add(sta);
+	rate_control_add_sta_debugfs(sta);
+
+	sinfo->generation = local->sta_generation;
+	cfg80211_new_sta(sdata->dev, sta->sta.addr, sinfo, GFP_KERNEL);
+	kfree(sinfo);
+
+	sta_dbg(sdata, "Inserted STA %pM\n", sta->sta.addr);
+
+	/* move reference to rcu-protected */
+	rcu_read_lock();
+	mutex_unlock(&local->sta_mtx);
+
+	if (ieee80211_vif_is_mesh(&sdata->vif))
+		mesh_accept_plinks_update(sdata);
+
+	return 0;
+ out_remove:
+	sta_info_hash_del(local, sta);
+	list_del_rcu(&sta->list);
+ out_drop_sta:
+	local->num_sta--;
+	synchronize_net();
+	cleanup_single_sta(sta);
+ out_err:
+	mutex_unlock(&local->sta_mtx);
+	kfree(sinfo);
+	rcu_read_lock();
+	return err;
+}
+
+int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU)
+{
+	struct ieee80211_local *local = sta->local;
+	int err;
+
+	might_sleep();
+
+	mutex_lock(&local->sta_mtx);
+
+	err = sta_info_insert_check(sta);
+	if (err) {
+		sta_info_free(local, sta);
+		mutex_unlock(&local->sta_mtx);
+		rcu_read_lock();
+		return err;
+	}
+
+	return sta_info_insert_finish(sta);
+}
+
+int sta_info_insert(struct sta_info *sta)
+{
+	int err = sta_info_insert_rcu(sta);
+
+	rcu_read_unlock();
+
+	return err;
+}
+
+static inline void __bss_tim_set(u8 *tim, u16 id)
+{
+	/*
+	 * This format has been mandated by the IEEE specifications,
+	 * so this line may not be changed to use the __set_bit() format.
+	 */
+	tim[id / 8] |= (1 << (id % 8));
+}
+
+static inline void __bss_tim_clear(u8 *tim, u16 id)
+{
+	/*
+	 * This format has been mandated by the IEEE specifications,
+	 * so this line may not be changed to use the __clear_bit() format.
+	 */
+	tim[id / 8] &= ~(1 << (id % 8));
+}
+
+static inline bool __bss_tim_get(u8 *tim, u16 id)
+{
+	/*
+	 * This format has been mandated by the IEEE specifications,
+	 * so this line may not be changed to use the test_bit() format.
+	 */
+	return tim[id / 8] & (1 << (id % 8));
+}
+
+static unsigned long ieee80211_tids_for_ac(int ac)
+{
+	/* If we ever support TIDs > 7, this obviously needs to be adjusted */
+	switch (ac) {
+	case IEEE80211_AC_VO:
+		return BIT(6) | BIT(7);
+	case IEEE80211_AC_VI:
+		return BIT(4) | BIT(5);
+	case IEEE80211_AC_BE:
+		return BIT(0) | BIT(3);
+	case IEEE80211_AC_BK:
+		return BIT(1) | BIT(2);
+	default:
+		WARN_ON(1);
+		return 0;
+	}
+}
+
+static void __sta_info_recalc_tim(struct sta_info *sta, bool ignore_pending)
+{
+	struct ieee80211_local *local = sta->local;
+	struct ps_data *ps;
+	bool indicate_tim = false;
+	u8 ignore_for_tim = sta->sta.uapsd_queues;
+	int ac;
+	u16 id = sta->sta.aid;
+
+	if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
+	    sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
+		if (WARN_ON_ONCE(!sta->sdata->bss))
+			return;
+
+		ps = &sta->sdata->bss->ps;
+#ifdef CONFIG_MAC80211_MESH
+	} else if (ieee80211_vif_is_mesh(&sta->sdata->vif)) {
+		ps = &sta->sdata->u.mesh.ps;
+#endif
+	} else {
+		return;
+	}
+
+	/* No need to do anything if the driver does all */
+	if (ieee80211_hw_check(&local->hw, AP_LINK_PS) && !local->ops->set_tim)
+		return;
+
+	if (sta->dead)
+		goto done;
+
+	/*
+	 * If all ACs are delivery-enabled then we should build
+	 * the TIM bit for all ACs anyway; if only some are then
+	 * we ignore those and build the TIM bit using only the
+	 * non-enabled ones.
+	 */
+	if (ignore_for_tim == BIT(IEEE80211_NUM_ACS) - 1)
+		ignore_for_tim = 0;
+
+	if (ignore_pending)
+		ignore_for_tim = BIT(IEEE80211_NUM_ACS) - 1;
+
+	for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
+		unsigned long tids;
+
+		if (ignore_for_tim & ieee80211_ac_to_qos_mask[ac])
+			continue;
+
+		indicate_tim |= !skb_queue_empty(&sta->tx_filtered[ac]) ||
+				!skb_queue_empty(&sta->ps_tx_buf[ac]);
+		if (indicate_tim)
+			break;
+
+		tids = ieee80211_tids_for_ac(ac);
+
+		indicate_tim |=
+			sta->driver_buffered_tids & tids;
+		indicate_tim |=
+			sta->txq_buffered_tids & tids;
+	}
+
+ done:
+	spin_lock_bh(&local->tim_lock);
+
+	if (indicate_tim == __bss_tim_get(ps->tim, id))
+		goto out_unlock;
+
+	if (indicate_tim)
+		__bss_tim_set(ps->tim, id);
+	else
+		__bss_tim_clear(ps->tim, id);
+
+	if (local->ops->set_tim && !WARN_ON(sta->dead)) {
+		local->tim_in_locked_section = true;
+		drv_set_tim(local, &sta->sta, indicate_tim);
+		local->tim_in_locked_section = false;
+	}
+
+out_unlock:
+	spin_unlock_bh(&local->tim_lock);
+}
+
+void sta_info_recalc_tim(struct sta_info *sta)
+{
+	__sta_info_recalc_tim(sta, false);
+}
+
+static bool sta_info_buffer_expired(struct sta_info *sta, struct sk_buff *skb)
+{
+	struct ieee80211_tx_info *info;
+	int timeout;
+
+	if (!skb)
+		return false;
+
+	info = IEEE80211_SKB_CB(skb);
+
+	/* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
+	timeout = (sta->listen_interval *
+		   sta->sdata->vif.bss_conf.beacon_int *
+		   32 / 15625) * HZ;
+	if (timeout < STA_TX_BUFFER_EXPIRE)
+		timeout = STA_TX_BUFFER_EXPIRE;
+	return time_after(jiffies, info->control.jiffies + timeout);
+}
+
+
+static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local *local,
+						struct sta_info *sta, int ac)
+{
+	unsigned long flags;
+	struct sk_buff *skb;
+
+	/*
+	 * First check for frames that should expire on the filtered
+	 * queue. Frames here were rejected by the driver and are on
+	 * a separate queue to avoid reordering with normal PS-buffered
+	 * frames. They also aren't accounted for right now in the
+	 * total_ps_buffered counter.
+	 */
+	for (;;) {
+		spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
+		skb = skb_peek(&sta->tx_filtered[ac]);
+		if (sta_info_buffer_expired(sta, skb))
+			skb = __skb_dequeue(&sta->tx_filtered[ac]);
+		else
+			skb = NULL;
+		spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
+
+		/*
+		 * Frames are queued in order, so if this one
+		 * hasn't expired yet we can stop testing. If
+		 * we actually reached the end of the queue we
+		 * also need to stop, of course.
+		 */
+		if (!skb)
+			break;
+		ieee80211_free_txskb(&local->hw, skb);
+	}
+
+	/*
+	 * Now also check the normal PS-buffered queue, this will
+	 * only find something if the filtered queue was emptied
+	 * since the filtered frames are all before the normal PS
+	 * buffered frames.
+	 */
+	for (;;) {
+		spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
+		skb = skb_peek(&sta->ps_tx_buf[ac]);
+		if (sta_info_buffer_expired(sta, skb))
+			skb = __skb_dequeue(&sta->ps_tx_buf[ac]);
+		else
+			skb = NULL;
+		spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
+
+		/*
+		 * frames are queued in order, so if this one
+		 * hasn't expired yet (or we reached the end of
+		 * the queue) we can stop testing
+		 */
+		if (!skb)
+			break;
+
+		local->total_ps_buffered--;
+		ps_dbg(sta->sdata, "Buffered frame expired (STA %pM)\n",
+		       sta->sta.addr);
+		ieee80211_free_txskb(&local->hw, skb);
+	}
+
+	/*
+	 * Finally, recalculate the TIM bit for this station -- it might
+	 * now be clear because the station was too slow to retrieve its
+	 * frames.
+	 */
+	sta_info_recalc_tim(sta);
+
+	/*
+	 * Return whether there are any frames still buffered, this is
+	 * used to check whether the cleanup timer still needs to run,
+	 * if there are no frames we don't need to rearm the timer.
+	 */
+	return !(skb_queue_empty(&sta->ps_tx_buf[ac]) &&
+		 skb_queue_empty(&sta->tx_filtered[ac]));
+}
+
+static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
+					     struct sta_info *sta)
+{
+	bool have_buffered = false;
+	int ac;
+
+	/* This is only necessary for stations on BSS/MBSS interfaces */
+	if (!sta->sdata->bss &&
+	    !ieee80211_vif_is_mesh(&sta->sdata->vif))
+		return false;
+
+	for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
+		have_buffered |=
+			sta_info_cleanup_expire_buffered_ac(local, sta, ac);
+
+	return have_buffered;
+}
+
+static int __must_check __sta_info_destroy_part1(struct sta_info *sta)
+{
+	struct ieee80211_local *local;
+	struct ieee80211_sub_if_data *sdata;
+	int ret;
+
+	might_sleep();
+
+	if (!sta)
+		return -ENOENT;
+
+	local = sta->local;
+	sdata = sta->sdata;
+
+	lockdep_assert_held(&local->sta_mtx);
+
+	/*
+	 * Before removing the station from the driver and
+	 * rate control, it might still start new aggregation
+	 * sessions -- block that to make sure the tear-down
+	 * will be sufficient.
+	 */
+	set_sta_flag(sta, WLAN_STA_BLOCK_BA);
+	ieee80211_sta_tear_down_BA_sessions(sta, AGG_STOP_DESTROY_STA);
+
+	/*
+	 * Before removing the station from the driver there might be pending
+	 * rx frames on RSS queues sent prior to the disassociation - wait for
+	 * all such frames to be processed.
+	 */
+	drv_sync_rx_queues(local, sta);
+
+	ret = sta_info_hash_del(local, sta);
+	if (WARN_ON(ret))
+		return ret;
+
+	/*
+	 * for TDLS peers, make sure to return to the base channel before
+	 * removal.
+	 */
+	if (test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) {
+		drv_tdls_cancel_channel_switch(local, sdata, &sta->sta);
+		clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
+	}
+
+	list_del_rcu(&sta->list);
+	sta->removed = true;
+
+	drv_sta_pre_rcu_remove(local, sta->sdata, sta);
+
+	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
+	    rcu_access_pointer(sdata->u.vlan.sta) == sta)
+		RCU_INIT_POINTER(sdata->u.vlan.sta, NULL);
+
+	return 0;
+}
+
+static void __sta_info_destroy_part2(struct sta_info *sta)
+{
+	struct ieee80211_local *local = sta->local;
+	struct ieee80211_sub_if_data *sdata = sta->sdata;
+	struct station_info *sinfo;
+	int ret;
+
+	/*
+	 * NOTE: This assumes at least synchronize_net() was done
+	 *	 after _part1 and before _part2!
+	 */
+
+	might_sleep();
+	lockdep_assert_held(&local->sta_mtx);
+
+	if (sta->sta_state == IEEE80211_STA_AUTHORIZED) {
+		ret = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
+		WARN_ON_ONCE(ret);
+	}
+
+	/* now keys can no longer be reached */
+	ieee80211_free_sta_keys(local, sta);
+
+	/* disable TIM bit - last chance to tell driver */
+	__sta_info_recalc_tim(sta, true);
+
+	sta->dead = true;
+
+	local->num_sta--;
+	local->sta_generation++;
+
+	while (sta->sta_state > IEEE80211_STA_NONE) {
+		ret = sta_info_move_state(sta, sta->sta_state - 1);
+		if (ret) {
+			WARN_ON_ONCE(1);
+			break;
+		}
+	}
+
+	if (sta->uploaded) {
+		ret = drv_sta_state(local, sdata, sta, IEEE80211_STA_NONE,
+				    IEEE80211_STA_NOTEXIST);
+		WARN_ON_ONCE(ret != 0);
+	}
+
+	sta_dbg(sdata, "Removed STA %pM\n", sta->sta.addr);
+
+	sinfo = kzalloc(sizeof(*sinfo), GFP_KERNEL);
+	if (sinfo)
+		sta_set_sinfo(sta, sinfo, true);
+	cfg80211_del_sta_sinfo(sdata->dev, sta->sta.addr, sinfo, GFP_KERNEL);
+	kfree(sinfo);
+
+	rate_control_remove_sta_debugfs(sta);
+	ieee80211_sta_debugfs_remove(sta);
+
+	ieee80211_destroy_frag_cache(&sta->frags);
+
+	cleanup_single_sta(sta);
+}
+
+int __must_check __sta_info_destroy(struct sta_info *sta)
+{
+	int err = __sta_info_destroy_part1(sta);
+
+	if (err)
+		return err;
+
+	synchronize_net();
+
+	__sta_info_destroy_part2(sta);
+
+	return 0;
+}
+
+int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr)
+{
+	struct sta_info *sta;
+	int ret;
+
+	mutex_lock(&sdata->local->sta_mtx);
+	sta = sta_info_get(sdata, addr);
+	ret = __sta_info_destroy(sta);
+	mutex_unlock(&sdata->local->sta_mtx);
+
+	return ret;
+}
+
+int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
+			      const u8 *addr)
+{
+	struct sta_info *sta;
+	int ret;
+
+	mutex_lock(&sdata->local->sta_mtx);
+	sta = sta_info_get_bss(sdata, addr);
+	ret = __sta_info_destroy(sta);
+	mutex_unlock(&sdata->local->sta_mtx);
+
+	return ret;
+}
+
+static void sta_info_cleanup(struct timer_list *t)
+{
+	struct ieee80211_local *local = from_timer(local, t, sta_cleanup);
+	struct sta_info *sta;
+	bool timer_needed = false;
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(sta, &local->sta_list, list)
+		if (sta_info_cleanup_expire_buffered(local, sta))
+			timer_needed = true;
+	rcu_read_unlock();
+
+	if (local->quiescing)
+		return;
+
+	if (!timer_needed)
+		return;
+
+	mod_timer(&local->sta_cleanup,
+		  round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL));
+}
+
+int sta_info_init(struct ieee80211_local *local)
+{
+	int err;
+
+	err = rhltable_init(&local->sta_hash, &sta_rht_params);
+	if (err)
+		return err;
+
+	spin_lock_init(&local->tim_lock);
+	mutex_init(&local->sta_mtx);
+	INIT_LIST_HEAD(&local->sta_list);
+
+	timer_setup(&local->sta_cleanup, sta_info_cleanup, 0);
+	return 0;
+}
+
+void sta_info_stop(struct ieee80211_local *local)
+{
+	del_timer_sync(&local->sta_cleanup);
+	rhltable_destroy(&local->sta_hash);
+}
+
+
+int __sta_info_flush(struct ieee80211_sub_if_data *sdata, bool vlans)
+{
+	struct ieee80211_local *local = sdata->local;
+	struct sta_info *sta, *tmp;
+	LIST_HEAD(free_list);
+	int ret = 0;
+
+	might_sleep();
+
+	WARN_ON(vlans && sdata->vif.type != NL80211_IFTYPE_AP);
+	WARN_ON(vlans && !sdata->bss);
+
+	mutex_lock(&local->sta_mtx);
+	list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
+		if (sdata == sta->sdata ||
+		    (vlans && sdata->bss == sta->sdata->bss)) {
+			if (!WARN_ON(__sta_info_destroy_part1(sta)))
+				list_add(&sta->free_list, &free_list);
+			ret++;
+		}
+	}
+
+	if (!list_empty(&free_list)) {
+		synchronize_net();
+		list_for_each_entry_safe(sta, tmp, &free_list, free_list)
+			__sta_info_destroy_part2(sta);
+	}
+	mutex_unlock(&local->sta_mtx);
+
+	return ret;
+}
+
+void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
+			  unsigned long exp_time)
+{
+	struct ieee80211_local *local = sdata->local;
+	struct sta_info *sta, *tmp;
+
+	mutex_lock(&local->sta_mtx);
+
+	list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
+		unsigned long last_active = ieee80211_sta_last_active(sta);
+
+		if (sdata != sta->sdata)
+			continue;
+
+		if (time_is_before_jiffies(last_active + exp_time)) {
+			sta_dbg(sta->sdata, "expiring inactive STA %pM\n",
+				sta->sta.addr);
+
+			if (ieee80211_vif_is_mesh(&sdata->vif) &&
+			    test_sta_flag(sta, WLAN_STA_PS_STA))
+				atomic_dec(&sdata->u.mesh.ps.num_sta_ps);
+
+			WARN_ON(__sta_info_destroy(sta));
+		}
+	}
+
+	mutex_unlock(&local->sta_mtx);
+}
+
+struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw,
+						   const u8 *addr,
+						   const u8 *localaddr)
+{
+	struct ieee80211_local *local = hw_to_local(hw);
+	struct rhlist_head *tmp;
+	struct sta_info *sta;
+
+	/*
+	 * Just return a random station if localaddr is NULL
+	 * ... first in list.
+	 */
+	for_each_sta_info(local, addr, sta, tmp) {
+		if (localaddr &&
+		    !ether_addr_equal(sta->sdata->vif.addr, localaddr))
+			continue;
+		if (!sta->uploaded)
+			return NULL;
+		return &sta->sta;
+	}
+
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr);
+
+struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif,
+					 const u8 *addr)
+{
+	struct sta_info *sta;
+
+	if (!vif)
+		return NULL;
+
+	sta = sta_info_get_bss(vif_to_sdata(vif), addr);
+	if (!sta)
+		return NULL;
+
+	if (!sta->uploaded)
+		return NULL;
+
+	return &sta->sta;
+}
+EXPORT_SYMBOL(ieee80211_find_sta);
+
+/* powersave support code */
+void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta)
+{
+	struct ieee80211_sub_if_data *sdata = sta->sdata;
+	struct ieee80211_local *local = sdata->local;
+	struct sk_buff_head pending;
+	int filtered = 0, buffered = 0, ac, i;
+	unsigned long flags;
+	struct ps_data *ps;
+
+	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
+		sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
+				     u.ap);
+
+	if (sdata->vif.type == NL80211_IFTYPE_AP)
+		ps = &sdata->bss->ps;
+	else if (ieee80211_vif_is_mesh(&sdata->vif))
+		ps = &sdata->u.mesh.ps;
+	else
+		return;
+
+	clear_sta_flag(sta, WLAN_STA_SP);
+
+	BUILD_BUG_ON(BITS_TO_LONGS(IEEE80211_NUM_TIDS) > 1);
+	sta->driver_buffered_tids = 0;
+	sta->txq_buffered_tids = 0;
+
+	if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
+		drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta);
+
+	if (sta->sta.txq[0]) {
+		for (i = 0; i < ARRAY_SIZE(sta->sta.txq); i++) {
+			if (!txq_has_queue(sta->sta.txq[i]))
+				continue;
+
+			drv_wake_tx_queue(local, to_txq_info(sta->sta.txq[i]));
+		}
+	}
+
+	skb_queue_head_init(&pending);
+
+	/* sync with ieee80211_tx_h_unicast_ps_buf */
+	spin_lock(&sta->ps_lock);
+	/* Send all buffered frames to the station */
+	for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
+		int count = skb_queue_len(&pending), tmp;
+
+		spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
+		skb_queue_splice_tail_init(&sta->tx_filtered[ac], &pending);
+		spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
+		tmp = skb_queue_len(&pending);
+		filtered += tmp - count;
+		count = tmp;
+
+		spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
+		skb_queue_splice_tail_init(&sta->ps_tx_buf[ac], &pending);
+		spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
+		tmp = skb_queue_len(&pending);
+		buffered += tmp - count;
+	}
+
+	ieee80211_add_pending_skbs(local, &pending);
+
+	/* now we're no longer in the deliver code */
+	clear_sta_flag(sta, WLAN_STA_PS_DELIVER);
+
+	/* The station might have polled and then woken up before we responded,
+	 * so clear these flags now to avoid them sticking around.
+	 */
+	clear_sta_flag(sta, WLAN_STA_PSPOLL);
+	clear_sta_flag(sta, WLAN_STA_UAPSD);
+	spin_unlock(&sta->ps_lock);
+
+	atomic_dec(&ps->num_sta_ps);
+
+	/* This station just woke up and isn't aware of our SMPS state */
+	if (!ieee80211_vif_is_mesh(&sdata->vif) &&
+	    !ieee80211_smps_is_restrictive(sta->known_smps_mode,
+					   sdata->smps_mode) &&
+	    sta->known_smps_mode != sdata->bss->req_smps &&
+	    sta_info_tx_streams(sta) != 1) {
+		ht_dbg(sdata,
+		       "%pM just woke up and MIMO capable - update SMPS\n",
+		       sta->sta.addr);
+		ieee80211_send_smps_action(sdata, sdata->bss->req_smps,
+					   sta->sta.addr,
+					   sdata->vif.bss_conf.bssid);
+	}
+
+	local->total_ps_buffered -= buffered;
+
+	sta_info_recalc_tim(sta);
+
+	ps_dbg(sdata,
+	       "STA %pM aid %d sending %d filtered/%d PS frames since STA woke up\n",
+	       sta->sta.addr, sta->sta.aid, filtered, buffered);
+
+	ieee80211_check_fast_xmit(sta);
+}
+
+static void ieee80211_send_null_response(struct sta_info *sta, int tid,
+					 enum ieee80211_frame_release_type reason,
+					 bool call_driver, bool more_data)
+{
+	struct ieee80211_sub_if_data *sdata = sta->sdata;
+	struct ieee80211_local *local = sdata->local;
+	struct ieee80211_qos_hdr *nullfunc;
+	struct sk_buff *skb;
+	int size = sizeof(*nullfunc);
+	__le16 fc;
+	bool qos = sta->sta.wme;
+	struct ieee80211_tx_info *info;
+	struct ieee80211_chanctx_conf *chanctx_conf;
+
+	if (qos) {
+		fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
+				 IEEE80211_STYPE_QOS_NULLFUNC |
+				 IEEE80211_FCTL_FROMDS);
+	} else {
+		size -= 2;
+		fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
+				 IEEE80211_STYPE_NULLFUNC |
+				 IEEE80211_FCTL_FROMDS);
+	}
+
+	skb = dev_alloc_skb(local->hw.extra_tx_headroom + size);
+	if (!skb)
+		return;
+
+	skb_reserve(skb, local->hw.extra_tx_headroom);
+
+	nullfunc = skb_put(skb, size);
+	nullfunc->frame_control = fc;
+	nullfunc->duration_id = 0;
+	memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN);
+	memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
+	memcpy(nullfunc->addr3, sdata->vif.addr, ETH_ALEN);
+	nullfunc->seq_ctrl = 0;
+
+	skb->priority = tid;
+	skb_set_queue_mapping(skb, ieee802_1d_to_ac[tid]);
+	if (qos) {
+		nullfunc->qos_ctrl = cpu_to_le16(tid);
+
+		if (reason == IEEE80211_FRAME_RELEASE_UAPSD) {
+			nullfunc->qos_ctrl |=
+				cpu_to_le16(IEEE80211_QOS_CTL_EOSP);
+			if (more_data)
+				nullfunc->frame_control |=
+					cpu_to_le16(IEEE80211_FCTL_MOREDATA);
+		}
+	}
+
+	info = IEEE80211_SKB_CB(skb);
+
+	/*
+	 * Tell TX path to send this frame even though the
+	 * STA may still remain is PS mode after this frame
+	 * exchange. Also set EOSP to indicate this packet
+	 * ends the poll/service period.
+	 */
+	info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER |
+		       IEEE80211_TX_STATUS_EOSP |
+		       IEEE80211_TX_CTL_REQ_TX_STATUS;
+
+	info->control.flags |= IEEE80211_TX_CTRL_PS_RESPONSE;
+
+	if (call_driver)
+		drv_allow_buffered_frames(local, sta, BIT(tid), 1,
+					  reason, false);
+
+	skb->dev = sdata->dev;
+
+	rcu_read_lock();
+	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
+	if (WARN_ON(!chanctx_conf)) {
+		rcu_read_unlock();
+		kfree_skb(skb);
+		return;
+	}
+
+	info->band = chanctx_conf->def.chan->band;
+	ieee80211_xmit(sdata, sta, skb, 0);
+	rcu_read_unlock();
+}
+
+static int find_highest_prio_tid(unsigned long tids)
+{
+	/* lower 3 TIDs aren't ordered perfectly */
+	if (tids & 0xF8)
+		return fls(tids) - 1;
+	/* TID 0 is BE just like TID 3 */
+	if (tids & BIT(0))
+		return 0;
+	return fls(tids) - 1;
+}
+
+/* Indicates if the MORE_DATA bit should be set in the last
+ * frame obtained by ieee80211_sta_ps_get_frames.
+ * Note that driver_release_tids is relevant only if
+ * reason = IEEE80211_FRAME_RELEASE_PSPOLL
+ */
+static bool
+ieee80211_sta_ps_more_data(struct sta_info *sta, u8 ignored_acs,
+			   enum ieee80211_frame_release_type reason,
+			   unsigned long driver_release_tids)
+{
+	int ac;
+
+	/* If the driver has data on more than one TID then
+	 * certainly there's more data if we release just a
+	 * single frame now (from a single TID). This will
+	 * only happen for PS-Poll.
+	 */
+	if (reason == IEEE80211_FRAME_RELEASE_PSPOLL &&
+	    hweight16(driver_release_tids) > 1)
+		return true;
+
+	for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
+		if (ignored_acs & ieee80211_ac_to_qos_mask[ac])
+			continue;
+
+		if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
+		    !skb_queue_empty(&sta->ps_tx_buf[ac]))
+			return true;
+	}
+
+	return false;
+}
+
+static void
+ieee80211_sta_ps_get_frames(struct sta_info *sta, int n_frames, u8 ignored_acs,
+			    enum ieee80211_frame_release_type reason,
+			    struct sk_buff_head *frames,
+			    unsigned long *driver_release_tids)
+{
+	struct ieee80211_sub_if_data *sdata = sta->sdata;
+	struct ieee80211_local *local = sdata->local;
+	int ac;
+
+	/* Get response frame(s) and more data bit for the last one. */
+	for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
+		unsigned long tids;
+
+		if (ignored_acs & ieee80211_ac_to_qos_mask[ac])
+			continue;
+
+		tids = ieee80211_tids_for_ac(ac);
+
+		/* if we already have frames from software, then we can't also
+		 * release from hardware queues
+		 */
+		if (skb_queue_empty(frames)) {
+			*driver_release_tids |=
+				sta->driver_buffered_tids & tids;
+			*driver_release_tids |= sta->txq_buffered_tids & tids;
+		}
+
+		if (!*driver_release_tids) {
+			struct sk_buff *skb;
+
+			while (n_frames > 0) {
+				skb = skb_dequeue(&sta->tx_filtered[ac]);
+				if (!skb) {
+					skb = skb_dequeue(
+						&sta->ps_tx_buf[ac]);
+					if (skb)
+						local->total_ps_buffered--;
+				}
+				if (!skb)
+					break;
+				n_frames--;
+				__skb_queue_tail(frames, skb);
+			}
+		}
+
+		/* If we have more frames buffered on this AC, then abort the
+		 * loop since we can't send more data from other ACs before
+		 * the buffered frames from this.
+		 */
+		if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
+		    !skb_queue_empty(&sta->ps_tx_buf[ac]))
+			break;
+	}
+}
+
+static void
+ieee80211_sta_ps_deliver_response(struct sta_info *sta,
+				  int n_frames, u8 ignored_acs,
+				  enum ieee80211_frame_release_type reason)
+{
+	struct ieee80211_sub_if_data *sdata = sta->sdata;
+	struct ieee80211_local *local = sdata->local;
+	unsigned long driver_release_tids = 0;
+	struct sk_buff_head frames;
+	bool more_data;
+
+	/* Service or PS-Poll period starts */
+	set_sta_flag(sta, WLAN_STA_SP);
+
+	__skb_queue_head_init(&frames);
+
+	ieee80211_sta_ps_get_frames(sta, n_frames, ignored_acs, reason,
+				    &frames, &driver_release_tids);
+
+	more_data = ieee80211_sta_ps_more_data(sta, ignored_acs, reason, driver_release_tids);
+
+	if (driver_release_tids && reason == IEEE80211_FRAME_RELEASE_PSPOLL)
+		driver_release_tids =
+			BIT(find_highest_prio_tid(driver_release_tids));
+
+	if (skb_queue_empty(&frames) && !driver_release_tids) {
+		int tid, ac;
+
+		/*
+		 * For PS-Poll, this can only happen due to a race condition
+		 * when we set the TIM bit and the station notices it, but
+		 * before it can poll for the frame we expire it.
+		 *
+		 * For uAPSD, this is said in the standard (11.2.1.5 h):
+		 *	At each unscheduled SP for a non-AP STA, the AP shall
+		 *	attempt to transmit at least one MSDU or MMPDU, but no
+		 *	more than the value specified in the Max SP Length field
+		 *	in the QoS Capability element from delivery-enabled ACs,
+		 *	that are destined for the non-AP STA.
+		 *
+		 * Since we have no other MSDU/MMPDU, transmit a QoS null frame.
+		 */
+
+		/* This will evaluate to 1, 3, 5 or 7. */
+		for (ac = IEEE80211_AC_VO; ac < IEEE80211_NUM_ACS; ac++)
+			if (!(ignored_acs & ieee80211_ac_to_qos_mask[ac]))
+				break;
+		tid = 7 - 2 * ac;
+
+		ieee80211_send_null_response(sta, tid, reason, true, false);
+	} else if (!driver_release_tids) {
+		struct sk_buff_head pending;
+		struct sk_buff *skb;
+		int num = 0;
+		u16 tids = 0;
+		bool need_null = false;
+
+		skb_queue_head_init(&pending);
+
+		while ((skb = __skb_dequeue(&frames))) {
+			struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+			struct ieee80211_hdr *hdr = (void *) skb->data;
+			u8 *qoshdr = NULL;
+
+			num++;
+
+			/*
+			 * Tell TX path to send this frame even though the
+			 * STA may still remain is PS mode after this frame
+			 * exchange.
+			 */
+			info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
+			info->control.flags |= IEEE80211_TX_CTRL_PS_RESPONSE;
+
+			/*
+			 * Use MoreData flag to indicate whether there are
+			 * more buffered frames for this STA
+			 */
+			if (more_data || !skb_queue_empty(&frames))
+				hdr->frame_control |=
+					cpu_to_le16(IEEE80211_FCTL_MOREDATA);
+			else
+				hdr->frame_control &=
+					cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
+
+			if (ieee80211_is_data_qos(hdr->frame_control) ||
+			    ieee80211_is_qos_nullfunc(hdr->frame_control))
+				qoshdr = ieee80211_get_qos_ctl(hdr);
+
+			tids |= BIT(skb->priority);
+
+			__skb_queue_tail(&pending, skb);
+
+			/* end service period after last frame or add one */
+			if (!skb_queue_empty(&frames))
+				continue;
+
+			if (reason != IEEE80211_FRAME_RELEASE_UAPSD) {
+				/* for PS-Poll, there's only one frame */
+				info->flags |= IEEE80211_TX_STATUS_EOSP |
+					       IEEE80211_TX_CTL_REQ_TX_STATUS;
+				break;
+			}
+
+			/* For uAPSD, things are a bit more complicated. If the
+			 * last frame has a QoS header (i.e. is a QoS-data or
+			 * QoS-nulldata frame) then just set the EOSP bit there
+			 * and be done.
+			 * If the frame doesn't have a QoS header (which means
+			 * it should be a bufferable MMPDU) then we can't set
+			 * the EOSP bit in the QoS header; add a QoS-nulldata
+			 * frame to the list to send it after the MMPDU.
+			 *
+			 * Note that this code is only in the mac80211-release
+			 * code path, we assume that the driver will not buffer
+			 * anything but QoS-data frames, or if it does, will
+			 * create the QoS-nulldata frame by itself if needed.
+			 *
+			 * Cf. 802.11-2012 10.2.1.10 (c).
+			 */
+			if (qoshdr) {
+				*qoshdr |= IEEE80211_QOS_CTL_EOSP;
+
+				info->flags |= IEEE80211_TX_STATUS_EOSP |
+					       IEEE80211_TX_CTL_REQ_TX_STATUS;
+			} else {
+				/* The standard isn't completely clear on this
+				 * as it says the more-data bit should be set
+				 * if there are more BUs. The QoS-Null frame
+				 * we're about to send isn't buffered yet, we
+				 * only create it below, but let's pretend it
+				 * was buffered just in case some clients only
+				 * expect more-data=0 when eosp=1.
+				 */
+				hdr->frame_control |=
+					cpu_to_le16(IEEE80211_FCTL_MOREDATA);
+				need_null = true;
+				num++;
+			}
+			break;
+		}
+
+		drv_allow_buffered_frames(local, sta, tids, num,
+					  reason, more_data);
+
+		ieee80211_add_pending_skbs(local, &pending);
+
+		if (need_null)
+			ieee80211_send_null_response(
+				sta, find_highest_prio_tid(tids),
+				reason, false, false);
+
+		sta_info_recalc_tim(sta);
+	} else {
+		int tid;
+
+		/*
+		 * We need to release a frame that is buffered somewhere in the
+		 * driver ... it'll have to handle that.
+		 * Note that the driver also has to check the number of frames
+		 * on the TIDs we're releasing from - if there are more than
+		 * n_frames it has to set the more-data bit (if we didn't ask
+		 * it to set it anyway due to other buffered frames); if there
+		 * are fewer than n_frames it has to make sure to adjust that
+		 * to allow the service period to end properly.
+		 */
+		drv_release_buffered_frames(local, sta, driver_release_tids,
+					    n_frames, reason, more_data);
+
+		/*
+		 * Note that we don't recalculate the TIM bit here as it would
+		 * most likely have no effect at all unless the driver told us
+		 * that the TID(s) became empty before returning here from the
+		 * release function.
+		 * Either way, however, when the driver tells us that the TID(s)
+		 * became empty or we find that a txq became empty, we'll do the
+		 * TIM recalculation.
+		 */
+
+		if (!sta->sta.txq[0])
+			return;
+
+		for (tid = 0; tid < ARRAY_SIZE(sta->sta.txq); tid++) {
+			if (!(driver_release_tids & BIT(tid)) ||
+			    txq_has_queue(sta->sta.txq[tid]))
+				continue;
+
+			sta_info_recalc_tim(sta);
+			break;
+		}
+	}
+}
+
+void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta)
+{
+	u8 ignore_for_response = sta->sta.uapsd_queues;
+
+	/*
+	 * If all ACs are delivery-enabled then we should reply
+	 * from any of them, if only some are enabled we reply
+	 * only from the non-enabled ones.
+	 */
+	if (ignore_for_response == BIT(IEEE80211_NUM_ACS) - 1)
+		ignore_for_response = 0;
+
+	ieee80211_sta_ps_deliver_response(sta, 1, ignore_for_response,
+					  IEEE80211_FRAME_RELEASE_PSPOLL);
+}
+
+void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta)
+{
+	int n_frames = sta->sta.max_sp;
+	u8 delivery_enabled = sta->sta.uapsd_queues;
+
+	/*
+	 * If we ever grow support for TSPEC this might happen if
+	 * the TSPEC update from hostapd comes in between a trigger
+	 * frame setting WLAN_STA_UAPSD in the RX path and this
+	 * actually getting called.
+	 */
+	if (!delivery_enabled)
+		return;
+
+	switch (sta->sta.max_sp) {
+	case 1:
+		n_frames = 2;
+		break;
+	case 2:
+		n_frames = 4;
+		break;
+	case 3:
+		n_frames = 6;
+		break;
+	case 0:
+		/* XXX: what is a good value? */
+		n_frames = 128;
+		break;
+	}
+
+	ieee80211_sta_ps_deliver_response(sta, n_frames, ~delivery_enabled,
+					  IEEE80211_FRAME_RELEASE_UAPSD);
+}
+
+void ieee80211_sta_block_awake(struct ieee80211_hw *hw,
+			       struct ieee80211_sta *pubsta, bool block)
+{
+	struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
+
+	trace_api_sta_block_awake(sta->local, pubsta, block);
+
+	if (block) {
+		set_sta_flag(sta, WLAN_STA_PS_DRIVER);
+		ieee80211_clear_fast_xmit(sta);
+		return;
+	}
+
+	if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
+		return;
+
+	if (!test_sta_flag(sta, WLAN_STA_PS_STA)) {
+		set_sta_flag(sta, WLAN_STA_PS_DELIVER);
+		clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
+		ieee80211_queue_work(hw, &sta->drv_deliver_wk);
+	} else if (test_sta_flag(sta, WLAN_STA_PSPOLL) ||
+		   test_sta_flag(sta, WLAN_STA_UAPSD)) {
+		/* must be asleep in this case */
+		clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
+		ieee80211_queue_work(hw, &sta->drv_deliver_wk);
+	} else {
+		clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
+		ieee80211_check_fast_xmit(sta);
+	}
+}
+EXPORT_SYMBOL(ieee80211_sta_block_awake);
+
+void ieee80211_sta_eosp(struct ieee80211_sta *pubsta)
+{
+	struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
+	struct ieee80211_local *local = sta->local;
+
+	trace_api_eosp(local, pubsta);
+
+	clear_sta_flag(sta, WLAN_STA_SP);
+}
+EXPORT_SYMBOL(ieee80211_sta_eosp);
+
+void ieee80211_send_eosp_nullfunc(struct ieee80211_sta *pubsta, int tid)
+{
+	struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
+	enum ieee80211_frame_release_type reason;
+	bool more_data;
+
+	trace_api_send_eosp_nullfunc(sta->local, pubsta, tid);
+
+	reason = IEEE80211_FRAME_RELEASE_UAPSD;
+	more_data = ieee80211_sta_ps_more_data(sta, ~sta->sta.uapsd_queues,
+					       reason, 0);
+
+	ieee80211_send_null_response(sta, tid, reason, false, more_data);
+}
+EXPORT_SYMBOL(ieee80211_send_eosp_nullfunc);
+
+void ieee80211_sta_set_buffered(struct ieee80211_sta *pubsta,
+				u8 tid, bool buffered)
+{
+	struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
+
+	if (WARN_ON(tid >= IEEE80211_NUM_TIDS))
+		return;
+
+	trace_api_sta_set_buffered(sta->local, pubsta, tid, buffered);
+
+	if (buffered)
+		set_bit(tid, &sta->driver_buffered_tids);
+	else
+		clear_bit(tid, &sta->driver_buffered_tids);
+
+	sta_info_recalc_tim(sta);
+}
+EXPORT_SYMBOL(ieee80211_sta_set_buffered);
+
+int sta_info_move_state(struct sta_info *sta,
+			enum ieee80211_sta_state new_state)
+{
+	might_sleep();
+
+	if (sta->sta_state == new_state)
+		return 0;
+
+	/* check allowed transitions first */
+
+	switch (new_state) {
+	case IEEE80211_STA_NONE:
+		if (sta->sta_state != IEEE80211_STA_AUTH)
+			return -EINVAL;
+		break;
+	case IEEE80211_STA_AUTH:
+		if (sta->sta_state != IEEE80211_STA_NONE &&
+		    sta->sta_state != IEEE80211_STA_ASSOC)
+			return -EINVAL;
+		break;
+	case IEEE80211_STA_ASSOC:
+		if (sta->sta_state != IEEE80211_STA_AUTH &&
+		    sta->sta_state != IEEE80211_STA_AUTHORIZED)
+			return -EINVAL;
+		break;
+	case IEEE80211_STA_AUTHORIZED:
+		if (sta->sta_state != IEEE80211_STA_ASSOC)
+			return -EINVAL;
+		break;
+	default:
+		WARN(1, "invalid state %d", new_state);
+		return -EINVAL;
+	}
+
+	sta_dbg(sta->sdata, "moving STA %pM to state %d\n",
+		sta->sta.addr, new_state);
+
+	/*
+	 * notify the driver before the actual changes so it can
+	 * fail the transition
+	 */
+	if (test_sta_flag(sta, WLAN_STA_INSERTED)) {
+		int err = drv_sta_state(sta->local, sta->sdata, sta,
+					sta->sta_state, new_state);
+		if (err)
+			return err;
+	}
+
+	/* reflect the change in all state variables */
+
+	switch (new_state) {
+	case IEEE80211_STA_NONE:
+		if (sta->sta_state == IEEE80211_STA_AUTH)
+			clear_bit(WLAN_STA_AUTH, &sta->_flags);
+		break;
+	case IEEE80211_STA_AUTH:
+		if (sta->sta_state == IEEE80211_STA_NONE) {
+			set_bit(WLAN_STA_AUTH, &sta->_flags);
+		} else if (sta->sta_state == IEEE80211_STA_ASSOC) {
+			clear_bit(WLAN_STA_ASSOC, &sta->_flags);
+			ieee80211_recalc_min_chandef(sta->sdata);
+			if (!sta->sta.support_p2p_ps)
+				ieee80211_recalc_p2p_go_ps_allowed(sta->sdata);
+		}
+		break;
+	case IEEE80211_STA_ASSOC:
+		if (sta->sta_state == IEEE80211_STA_AUTH) {
+			set_bit(WLAN_STA_ASSOC, &sta->_flags);
+			ieee80211_recalc_min_chandef(sta->sdata);
+			if (!sta->sta.support_p2p_ps)
+				ieee80211_recalc_p2p_go_ps_allowed(sta->sdata);
+		} else if (sta->sta_state == IEEE80211_STA_AUTHORIZED) {
+			ieee80211_vif_dec_num_mcast(sta->sdata);
+			clear_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
+			ieee80211_clear_fast_xmit(sta);
+			ieee80211_clear_fast_rx(sta);
+		}
+		break;
+	case IEEE80211_STA_AUTHORIZED:
+		if (sta->sta_state == IEEE80211_STA_ASSOC) {
+			ieee80211_vif_inc_num_mcast(sta->sdata);
+			set_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
+			ieee80211_check_fast_xmit(sta);
+			ieee80211_check_fast_rx(sta);
+		}
+		if (sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
+		    sta->sdata->vif.type == NL80211_IFTYPE_AP)
+			cfg80211_send_layer2_update(sta->sdata->dev,
+						    sta->sta.addr);
+		break;
+	default:
+		break;
+	}
+
+	sta->sta_state = new_state;
+
+	return 0;
+}
+
+u8 sta_info_tx_streams(struct sta_info *sta)
+{
+	struct ieee80211_sta_ht_cap *ht_cap = &sta->sta.ht_cap;
+	u8 rx_streams;
+
+	if (!sta->sta.ht_cap.ht_supported)
+		return 1;
+
+	if (sta->sta.vht_cap.vht_supported) {
+		int i;
+		u16 tx_mcs_map =
+			le16_to_cpu(sta->sta.vht_cap.vht_mcs.tx_mcs_map);
+
+		for (i = 7; i >= 0; i--)
+			if ((tx_mcs_map & (0x3 << (i * 2))) !=
+			    IEEE80211_VHT_MCS_NOT_SUPPORTED)
+				return i + 1;
+	}
+
+	if (ht_cap->mcs.rx_mask[3])
+		rx_streams = 4;
+	else if (ht_cap->mcs.rx_mask[2])
+		rx_streams = 3;
+	else if (ht_cap->mcs.rx_mask[1])
+		rx_streams = 2;
+	else
+		rx_streams = 1;
+
+	if (!(ht_cap->mcs.tx_params & IEEE80211_HT_MCS_TX_RX_DIFF))
+		return rx_streams;
+
+	return ((ht_cap->mcs.tx_params & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
+			>> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1;
+}
+
+static struct ieee80211_sta_rx_stats *
+sta_get_last_rx_stats(struct sta_info *sta)
+{
+	struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;
+	struct ieee80211_local *local = sta->local;
+	int cpu;
+
+	if (!ieee80211_hw_check(&local->hw, USES_RSS))
+		return stats;
+
+	for_each_possible_cpu(cpu) {
+		struct ieee80211_sta_rx_stats *cpustats;
+
+		cpustats = per_cpu_ptr(sta->pcpu_rx_stats, cpu);
+
+		if (time_after(cpustats->last_rx, stats->last_rx))
+			stats = cpustats;
+	}
+
+	return stats;
+}
+
+static void sta_stats_decode_rate(struct ieee80211_local *local, u32 rate,
+				  struct rate_info *rinfo)
+{
+	rinfo->bw = STA_STATS_GET(BW, rate);
+
+	switch (STA_STATS_GET(TYPE, rate)) {
+	case STA_STATS_RATE_TYPE_VHT:
+		rinfo->flags = RATE_INFO_FLAGS_VHT_MCS;
+		rinfo->mcs = STA_STATS_GET(VHT_MCS, rate);
+		rinfo->nss = STA_STATS_GET(VHT_NSS, rate);
+		if (STA_STATS_GET(SGI, rate))
+			rinfo->flags |= RATE_INFO_FLAGS_SHORT_GI;
+		break;
+	case STA_STATS_RATE_TYPE_HT:
+		rinfo->flags = RATE_INFO_FLAGS_MCS;
+		rinfo->mcs = STA_STATS_GET(HT_MCS, rate);
+		if (STA_STATS_GET(SGI, rate))
+			rinfo->flags |= RATE_INFO_FLAGS_SHORT_GI;
+		break;
+	case STA_STATS_RATE_TYPE_LEGACY: {
+		struct ieee80211_supported_band *sband;
+		u16 brate;
+		unsigned int shift;
+		int band = STA_STATS_GET(LEGACY_BAND, rate);
+		int rate_idx = STA_STATS_GET(LEGACY_IDX, rate);
+
+		sband = local->hw.wiphy->bands[band];
+
+		if (WARN_ON_ONCE(!sband->bitrates))
+			break;
+
+		brate = sband->bitrates[rate_idx].bitrate;
+		if (rinfo->bw == RATE_INFO_BW_5)
+			shift = 2;
+		else if (rinfo->bw == RATE_INFO_BW_10)
+			shift = 1;
+		else
+			shift = 0;
+		rinfo->legacy = DIV_ROUND_UP(brate, 1 << shift);
+		break;
+		}
+	case STA_STATS_RATE_TYPE_HE:
+		rinfo->flags = RATE_INFO_FLAGS_HE_MCS;
+		rinfo->mcs = STA_STATS_GET(HE_MCS, rate);
+		rinfo->nss = STA_STATS_GET(HE_NSS, rate);
+		rinfo->he_gi = STA_STATS_GET(HE_GI, rate);
+		rinfo->he_ru_alloc = STA_STATS_GET(HE_RU, rate);
+		rinfo->he_dcm = STA_STATS_GET(HE_DCM, rate);
+		break;
+	}
+}
+
+static int sta_set_rate_info_rx(struct sta_info *sta, struct rate_info *rinfo)
+{
+	u16 rate = READ_ONCE(sta_get_last_rx_stats(sta)->last_rate);
+
+	if (rate == STA_STATS_RATE_INVALID)
+		return -EINVAL;
+
+	sta_stats_decode_rate(sta->local, rate, rinfo);
+	return 0;
+}
+
+static void sta_set_tidstats(struct sta_info *sta,
+			     struct cfg80211_tid_stats *tidstats,
+			     int tid)
+{
+	struct ieee80211_local *local = sta->local;
+
+	if (!(tidstats->filled & BIT(NL80211_TID_STATS_RX_MSDU))) {
+		unsigned int start;
+
+		do {
+			start = u64_stats_fetch_begin(&sta->rx_stats.syncp);
+			tidstats->rx_msdu = sta->rx_stats.msdu[tid];
+		} while (u64_stats_fetch_retry(&sta->rx_stats.syncp, start));
+
+		tidstats->filled |= BIT(NL80211_TID_STATS_RX_MSDU);
+	}
+
+	if (!(tidstats->filled & BIT(NL80211_TID_STATS_TX_MSDU))) {
+		tidstats->filled |= BIT(NL80211_TID_STATS_TX_MSDU);
+		tidstats->tx_msdu = sta->tx_stats.msdu[tid];
+	}
+
+	if (!(tidstats->filled & BIT(NL80211_TID_STATS_TX_MSDU_RETRIES)) &&
+	    ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
+		tidstats->filled |= BIT(NL80211_TID_STATS_TX_MSDU_RETRIES);
+		tidstats->tx_msdu_retries = sta->status_stats.msdu_retries[tid];
+	}
+
+	if (!(tidstats->filled & BIT(NL80211_TID_STATS_TX_MSDU_FAILED)) &&
+	    ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
+		tidstats->filled |= BIT(NL80211_TID_STATS_TX_MSDU_FAILED);
+		tidstats->tx_msdu_failed = sta->status_stats.msdu_failed[tid];
+	}
+
+	if (local->ops->wake_tx_queue && tid < IEEE80211_NUM_TIDS) {
+		spin_lock_bh(&local->fq.lock);
+		rcu_read_lock();
+
+		tidstats->filled |= BIT(NL80211_TID_STATS_TXQ_STATS);
+		ieee80211_fill_txq_stats(&tidstats->txq_stats,
+					 to_txq_info(sta->sta.txq[tid]));
+
+		rcu_read_unlock();
+		spin_unlock_bh(&local->fq.lock);
+	}
+}
+
+static inline u64 sta_get_stats_bytes(struct ieee80211_sta_rx_stats *rxstats)
+{
+	unsigned int start;
+	u64 value;
+
+	do {
+		start = u64_stats_fetch_begin(&rxstats->syncp);
+		value = rxstats->bytes;
+	} while (u64_stats_fetch_retry(&rxstats->syncp, start));
+
+	return value;
+}
+
+void sta_set_sinfo(struct sta_info *sta, struct station_info *sinfo,
+		   bool tidstats)
+{
+	struct ieee80211_sub_if_data *sdata = sta->sdata;
+	struct ieee80211_local *local = sdata->local;
+	u32 thr = 0;
+	int i, ac, cpu;
+	struct ieee80211_sta_rx_stats *last_rxstats;
+
+	last_rxstats = sta_get_last_rx_stats(sta);
+
+	sinfo->generation = sdata->local->sta_generation;
+
+	/* do before driver, so beacon filtering drivers have a
+	 * chance to e.g. just add the number of filtered beacons
+	 * (or just modify the value entirely, of course)
+	 */
+	if (sdata->vif.type == NL80211_IFTYPE_STATION)
+		sinfo->rx_beacon = sdata->u.mgd.count_beacon_signal;
+
+	drv_sta_statistics(local, sdata, &sta->sta, sinfo);
+
+	sinfo->filled |= BIT_ULL(NL80211_STA_INFO_INACTIVE_TIME) |
+			 BIT_ULL(NL80211_STA_INFO_STA_FLAGS) |
+			 BIT_ULL(NL80211_STA_INFO_BSS_PARAM) |
+			 BIT_ULL(NL80211_STA_INFO_CONNECTED_TIME) |
+			 BIT_ULL(NL80211_STA_INFO_RX_DROP_MISC);
+
+	if (sdata->vif.type == NL80211_IFTYPE_STATION) {
+		sinfo->beacon_loss_count = sdata->u.mgd.beacon_loss_count;
+		sinfo->filled |= BIT_ULL(NL80211_STA_INFO_BEACON_LOSS);
+	}
+
+	sinfo->connected_time = ktime_get_seconds() - sta->last_connected;
+	sinfo->inactive_time =
+		jiffies_to_msecs(jiffies - ieee80211_sta_last_active(sta));
+
+	if (!(sinfo->filled & (BIT_ULL(NL80211_STA_INFO_TX_BYTES64) |
+			       BIT_ULL(NL80211_STA_INFO_TX_BYTES)))) {
+		sinfo->tx_bytes = 0;
+		for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
+			sinfo->tx_bytes += sta->tx_stats.bytes[ac];
+		sinfo->filled |= BIT_ULL(NL80211_STA_INFO_TX_BYTES64);
+	}
+
+	if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_TX_PACKETS))) {
+		sinfo->tx_packets = 0;
+		for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
+			sinfo->tx_packets += sta->tx_stats.packets[ac];
+		sinfo->filled |= BIT_ULL(NL80211_STA_INFO_TX_PACKETS);
+	}
+
+	if (!(sinfo->filled & (BIT_ULL(NL80211_STA_INFO_RX_BYTES64) |
+			       BIT_ULL(NL80211_STA_INFO_RX_BYTES)))) {
+		sinfo->rx_bytes += sta_get_stats_bytes(&sta->rx_stats);
+
+		if (sta->pcpu_rx_stats) {
+			for_each_possible_cpu(cpu) {
+				struct ieee80211_sta_rx_stats *cpurxs;
+
+				cpurxs = per_cpu_ptr(sta->pcpu_rx_stats, cpu);
+				sinfo->rx_bytes += sta_get_stats_bytes(cpurxs);
+			}
+		}
+
+		sinfo->filled |= BIT_ULL(NL80211_STA_INFO_RX_BYTES64);
+	}
+
+	if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_RX_PACKETS))) {
+		sinfo->rx_packets = sta->rx_stats.packets;
+		if (sta->pcpu_rx_stats) {
+			for_each_possible_cpu(cpu) {
+				struct ieee80211_sta_rx_stats *cpurxs;
+
+				cpurxs = per_cpu_ptr(sta->pcpu_rx_stats, cpu);
+				sinfo->rx_packets += cpurxs->packets;
+			}
+		}
+		sinfo->filled |= BIT_ULL(NL80211_STA_INFO_RX_PACKETS);
+	}
+
+	if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_TX_RETRIES))) {
+		sinfo->tx_retries = sta->status_stats.retry_count;
+		sinfo->filled |= BIT_ULL(NL80211_STA_INFO_TX_RETRIES);
+	}
+
+	if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_TX_FAILED))) {
+		sinfo->tx_failed = sta->status_stats.retry_failed;
+		sinfo->filled |= BIT_ULL(NL80211_STA_INFO_TX_FAILED);
+	}
+
+	sinfo->rx_dropped_misc = sta->rx_stats.dropped;
+	if (sta->pcpu_rx_stats) {
+		for_each_possible_cpu(cpu) {
+			struct ieee80211_sta_rx_stats *cpurxs;
+
+			cpurxs = per_cpu_ptr(sta->pcpu_rx_stats, cpu);
+			sinfo->rx_dropped_misc += cpurxs->dropped;
+		}
+	}
+
+	if (sdata->vif.type == NL80211_IFTYPE_STATION &&
+	    !(sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)) {
+		sinfo->filled |= BIT_ULL(NL80211_STA_INFO_BEACON_RX) |
+				 BIT_ULL(NL80211_STA_INFO_BEACON_SIGNAL_AVG);
+		sinfo->rx_beacon_signal_avg = ieee80211_ave_rssi(&sdata->vif);
+	}
+
+	if (ieee80211_hw_check(&sta->local->hw, SIGNAL_DBM) ||
+	    ieee80211_hw_check(&sta->local->hw, SIGNAL_UNSPEC)) {
+		if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_SIGNAL))) {
+			sinfo->signal = (s8)last_rxstats->last_signal;
+			sinfo->filled |= BIT_ULL(NL80211_STA_INFO_SIGNAL);
+		}
+
+		if (!sta->pcpu_rx_stats &&
+		    !(sinfo->filled & BIT_ULL(NL80211_STA_INFO_SIGNAL_AVG))) {
+			sinfo->signal_avg =
+				-ewma_signal_read(&sta->rx_stats_avg.signal);
+			sinfo->filled |= BIT_ULL(NL80211_STA_INFO_SIGNAL_AVG);
+		}
+	}
+
+	/* for the average - if pcpu_rx_stats isn't set - rxstats must point to
+	 * the sta->rx_stats struct, so the check here is fine with and without
+	 * pcpu statistics
+	 */
+	if (last_rxstats->chains &&
+	    !(sinfo->filled & (BIT_ULL(NL80211_STA_INFO_CHAIN_SIGNAL) |
+			       BIT_ULL(NL80211_STA_INFO_CHAIN_SIGNAL_AVG)))) {
+		sinfo->filled |= BIT_ULL(NL80211_STA_INFO_CHAIN_SIGNAL);
+		if (!sta->pcpu_rx_stats)
+			sinfo->filled |= BIT_ULL(NL80211_STA_INFO_CHAIN_SIGNAL_AVG);
+
+		sinfo->chains = last_rxstats->chains;
+
+		for (i = 0; i < ARRAY_SIZE(sinfo->chain_signal); i++) {
+			sinfo->chain_signal[i] =
+				last_rxstats->chain_signal_last[i];
+			sinfo->chain_signal_avg[i] =
+				-ewma_signal_read(&sta->rx_stats_avg.chain_signal[i]);
+		}
+	}
+
+	if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_TX_BITRATE))) {
+		sta_set_rate_info_tx(sta, &sta->tx_stats.last_rate,
+				     &sinfo->txrate);
+		sinfo->filled |= BIT_ULL(NL80211_STA_INFO_TX_BITRATE);
+	}
+
+	if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_RX_BITRATE))) {
+		if (sta_set_rate_info_rx(sta, &sinfo->rxrate) == 0)
+			sinfo->filled |= BIT_ULL(NL80211_STA_INFO_RX_BITRATE);
+	}
+
+	if (tidstats && !cfg80211_sinfo_alloc_tid_stats(sinfo, GFP_KERNEL)) {
+		for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) {
+			struct cfg80211_tid_stats *tidstats = &sinfo->pertid[i];
+
+			sta_set_tidstats(sta, tidstats, i);
+		}
+	}
+
+	if (ieee80211_vif_is_mesh(&sdata->vif)) {
+#ifdef CONFIG_MAC80211_MESH
+		sinfo->filled |= BIT_ULL(NL80211_STA_INFO_LLID) |
+				 BIT_ULL(NL80211_STA_INFO_PLID) |
+				 BIT_ULL(NL80211_STA_INFO_PLINK_STATE) |
+				 BIT_ULL(NL80211_STA_INFO_LOCAL_PM) |
+				 BIT_ULL(NL80211_STA_INFO_PEER_PM) |
+				 BIT_ULL(NL80211_STA_INFO_NONPEER_PM);
+
+		sinfo->llid = sta->mesh->llid;
+		sinfo->plid = sta->mesh->plid;
+		sinfo->plink_state = sta->mesh->plink_state;
+		if (test_sta_flag(sta, WLAN_STA_TOFFSET_KNOWN)) {
+			sinfo->filled |= BIT_ULL(NL80211_STA_INFO_T_OFFSET);
+			sinfo->t_offset = sta->mesh->t_offset;
+		}
+		sinfo->local_pm = sta->mesh->local_pm;
+		sinfo->peer_pm = sta->mesh->peer_pm;
+		sinfo->nonpeer_pm = sta->mesh->nonpeer_pm;
+#endif
+	}
+
+	sinfo->bss_param.flags = 0;
+	if (sdata->vif.bss_conf.use_cts_prot)
+		sinfo->bss_param.flags |= BSS_PARAM_FLAGS_CTS_PROT;
+	if (sdata->vif.bss_conf.use_short_preamble)
+		sinfo->bss_param.flags |= BSS_PARAM_FLAGS_SHORT_PREAMBLE;
+	if (sdata->vif.bss_conf.use_short_slot)
+		sinfo->bss_param.flags |= BSS_PARAM_FLAGS_SHORT_SLOT_TIME;
+	sinfo->bss_param.dtim_period = sdata->vif.bss_conf.dtim_period;
+	sinfo->bss_param.beacon_interval = sdata->vif.bss_conf.beacon_int;
+
+	sinfo->sta_flags.set = 0;
+	sinfo->sta_flags.mask = BIT(NL80211_STA_FLAG_AUTHORIZED) |
+				BIT(NL80211_STA_FLAG_SHORT_PREAMBLE) |
+				BIT(NL80211_STA_FLAG_WME) |
+				BIT(NL80211_STA_FLAG_MFP) |
+				BIT(NL80211_STA_FLAG_AUTHENTICATED) |
+				BIT(NL80211_STA_FLAG_ASSOCIATED) |
+				BIT(NL80211_STA_FLAG_TDLS_PEER);
+	if (test_sta_flag(sta, WLAN_STA_AUTHORIZED))
+		sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_AUTHORIZED);
+	if (test_sta_flag(sta, WLAN_STA_SHORT_PREAMBLE))
+		sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_SHORT_PREAMBLE);
+	if (sta->sta.wme)
+		sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_WME);
+	if (test_sta_flag(sta, WLAN_STA_MFP))
+		sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_MFP);
+	if (test_sta_flag(sta, WLAN_STA_AUTH))
+		sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_AUTHENTICATED);
+	if (test_sta_flag(sta, WLAN_STA_ASSOC))
+		sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_ASSOCIATED);
+	if (test_sta_flag(sta, WLAN_STA_TDLS_PEER))
+		sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_TDLS_PEER);
+
+	thr = sta_get_expected_throughput(sta);
+
+	if (thr != 0) {
+		sinfo->filled |= BIT_ULL(NL80211_STA_INFO_EXPECTED_THROUGHPUT);
+		sinfo->expected_throughput = thr;
+	}
+
+	if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_ACK_SIGNAL)) &&
+	    sta->status_stats.ack_signal_filled) {
+		sinfo->ack_signal = sta->status_stats.last_ack_signal;
+		sinfo->filled |= BIT_ULL(NL80211_STA_INFO_ACK_SIGNAL);
+	}
+
+	if (ieee80211_hw_check(&sta->local->hw, REPORTS_TX_ACK_STATUS) &&
+	    !(sinfo->filled & BIT_ULL(NL80211_STA_INFO_DATA_ACK_SIGNAL_AVG))) {
+		sinfo->avg_ack_signal =
+			-(s8)ewma_avg_signal_read(
+				&sta->status_stats.avg_ack_signal);
+		sinfo->filled |=
+			BIT_ULL(NL80211_STA_INFO_DATA_ACK_SIGNAL_AVG);
+	}
+}
+
+u32 sta_get_expected_throughput(struct sta_info *sta)
+{
+	struct ieee80211_sub_if_data *sdata = sta->sdata;
+	struct ieee80211_local *local = sdata->local;
+	struct rate_control_ref *ref = NULL;
+	u32 thr = 0;
+
+	if (test_sta_flag(sta, WLAN_STA_RATE_CONTROL))
+		ref = local->rate_ctrl;
+
+	/* check if the driver has a SW RC implementation */
+	if (ref && ref->ops->get_expected_throughput)
+		thr = ref->ops->get_expected_throughput(sta->rate_ctrl_priv);
+	else
+		thr = drv_get_expected_throughput(local, sta);
+
+	return thr;
+}
+
+unsigned long ieee80211_sta_last_active(struct sta_info *sta)
+{
+	struct ieee80211_sta_rx_stats *stats = sta_get_last_rx_stats(sta);
+
+	if (!sta->status_stats.last_ack ||
+	    time_after(stats->last_rx, sta->status_stats.last_ack))
+		return stats->last_rx;
+	return sta->status_stats.last_ack;
+}
+
+static void sta_update_codel_params(struct sta_info *sta, u32 thr)
+{
+	if (!sta->sdata->local->ops->wake_tx_queue)
+		return;
+
+	if (thr && thr < STA_SLOW_THRESHOLD * sta->local->num_sta) {
+		sta->cparams.target = MS2TIME(50);
+		sta->cparams.interval = MS2TIME(300);
+		sta->cparams.ecn = false;
+	} else {
+		sta->cparams.target = MS2TIME(20);
+		sta->cparams.interval = MS2TIME(100);
+		sta->cparams.ecn = true;
+	}
+}
+
+void ieee80211_sta_set_expected_throughput(struct ieee80211_sta *pubsta,
+					   u32 thr)
+{
+	struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
+
+	sta_update_codel_params(sta, thr);
+}