/*
   * Copyright 2002-2005, Devicescape Software, Inc.
   *
   * 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.
   */
  
  #ifndef STA_INFO_H
  #define STA_INFO_H
  
  #include <linux/list.h>
  #include <linux/types.h>
  #include <linux/if_ether.h>
  #include <linux/workqueue.h>
  #include <linux/average.h>
  #include <linux/etherdevice.h>
  #include "key.h"
  
  /**
   * enum ieee80211_sta_info_flags - Stations flags
   *
   * These flags are used with &struct sta_info's @flags member, but
   * only indirectly with set_sta_flag() and friends.
   *
   * @WLAN_STA_AUTH: Station is authenticated.
   * @WLAN_STA_ASSOC: Station is associated.
   * @WLAN_STA_PS_STA: Station is in power-save mode
   * @WLAN_STA_AUTHORIZED: Station is authorized to send/receive traffic.
   *	This bit is always checked so needs to be enabled for all stations
   *	when virtual port control is not in use.
   * @WLAN_STA_SHORT_PREAMBLE: Station is capable of receiving short-preamble
   *	frames.
   * @WLAN_STA_WME: Station is a QoS-STA.
   * @WLAN_STA_WDS: Station is one of our WDS peers.
   * @WLAN_STA_CLEAR_PS_FILT: Clear PS filter in hardware (using the
   *	IEEE80211_TX_CTL_CLEAR_PS_FILT control flag) when the next
   *	frame to this station is transmitted.
   * @WLAN_STA_MFP: Management frame protection is used with this STA.
   * @WLAN_STA_BLOCK_BA: Used to deny ADDBA requests (both TX and RX)
   *	during suspend/resume and station removal.
   * @WLAN_STA_PS_DRIVER: driver requires keeping this station in
   *	power-save mode logically to flush frames that might still
   *	be in the queues
   * @WLAN_STA_PSPOLL: Station sent PS-poll while driver was keeping
   *	station in power-save mode, reply when the driver unblocks.
   * @WLAN_STA_TDLS_PEER: Station is a TDLS peer.
   * @WLAN_STA_TDLS_PEER_AUTH: This TDLS peer is authorized to send direct
   *	packets. This means the link is enabled.
   * @WLAN_STA_UAPSD: Station requested unscheduled SP while driver was
   *	keeping station in power-save mode, reply when the driver
   *	unblocks the station.
   * @WLAN_STA_SP: Station is in a service period, so don't try to
   *	reply to other uAPSD trigger frames or PS-Poll.
   * @WLAN_STA_4ADDR_EVENT: 4-addr event was already sent for this frame.
   * @WLAN_STA_INSERTED: This station is inserted into the hash table.
   * @WLAN_STA_RATE_CONTROL: rate control was initialized for this station.
   * @WLAN_STA_TOFFSET_KNOWN: toffset calculated for this station is valid.
   * @WLAN_STA_MPSP_OWNER: local STA is owner of a mesh Peer Service Period.
   * @WLAN_STA_MPSP_RECIPIENT: local STA is recipient of a MPSP.
   */
  enum ieee80211_sta_info_flags {
  	WLAN_STA_AUTH,
  	WLAN_STA_ASSOC,
  	WLAN_STA_PS_STA,
  	WLAN_STA_AUTHORIZED,
  	WLAN_STA_SHORT_PREAMBLE,
  	WLAN_STA_WME,
  	WLAN_STA_WDS,
  	WLAN_STA_CLEAR_PS_FILT,
  	WLAN_STA_MFP,
  	WLAN_STA_BLOCK_BA,
  	WLAN_STA_PS_DRIVER,
  	WLAN_STA_PSPOLL,
  	WLAN_STA_TDLS_PEER,
  	WLAN_STA_TDLS_PEER_AUTH,
  	WLAN_STA_UAPSD,
  	WLAN_STA_SP,
  	WLAN_STA_4ADDR_EVENT,
  	WLAN_STA_INSERTED,
  	WLAN_STA_RATE_CONTROL,
  	WLAN_STA_TOFFSET_KNOWN,
  	WLAN_STA_MPSP_OWNER,
  	WLAN_STA_MPSP_RECIPIENT,
  };
  
  #define ADDBA_RESP_INTERVAL HZ
  #define HT_AGG_MAX_RETRIES		15
  #define HT_AGG_BURST_RETRIES		3
  #define HT_AGG_RETRIES_PERIOD		(15 * HZ)
  
  #define HT_AGG_STATE_DRV_READY		0
  #define HT_AGG_STATE_RESPONSE_RECEIVED	1
  #define HT_AGG_STATE_OPERATIONAL	2
  #define HT_AGG_STATE_STOPPING		3
  #define HT_AGG_STATE_WANT_START		4
  #define HT_AGG_STATE_WANT_STOP		5
  
  enum ieee80211_agg_stop_reason {
  	AGG_STOP_DECLINED,
  	AGG_STOP_LOCAL_REQUEST,
  	AGG_STOP_PEER_REQUEST,
  	AGG_STOP_DESTROY_STA,
  };
  
  /**
   * struct tid_ampdu_tx - TID aggregation information (Tx).
   *
   * @rcu_head: rcu head for freeing structure
   * @session_timer: check if we keep Tx-ing on the TID (by timeout value)
   * @addba_resp_timer: timer for peer's response to addba request
   * @pending: pending frames queue -- use sta's spinlock to protect
   * @dialog_token: dialog token for aggregation session
   * @timeout: session timeout value to be filled in ADDBA requests
   * @state: session state (see above)
   * @last_tx: jiffies of last tx activity
   * @stop_initiator: initiator of a session stop
   * @tx_stop: TX DelBA frame when stopping
   * @buf_size: reorder buffer size at receiver
   * @failed_bar_ssn: ssn of the last failed BAR tx attempt
   * @bar_pending: BAR needs to be re-sent
   *
   * This structure's lifetime is managed by RCU, assignments to
   * the array holding it must hold the aggregation mutex.
   *
   * The TX path can access it under RCU lock-free if, and
   * only if, the state has the flag %HT_AGG_STATE_OPERATIONAL
   * set. Otherwise, the TX path must also acquire the spinlock
   * and re-check the state, see comments in the tx code
   * touching it.
   */
  struct tid_ampdu_tx {
  	struct rcu_head rcu_head;
  	struct timer_list session_timer;
  	struct timer_list addba_resp_timer;
  	struct sk_buff_head pending;
  	unsigned long state;
  	unsigned long last_tx;
  	u16 timeout;
  	u8 dialog_token;
  	u8 stop_initiator;
  	bool tx_stop;
  	u8 buf_size;
  
  	u16 failed_bar_ssn;
  	bool bar_pending;
  };
  
  /**
   * struct tid_ampdu_rx - TID aggregation information (Rx).
   *
   * @reorder_buf: buffer to reorder incoming aggregated MPDUs
   * @reorder_time: jiffies when skb was added
   * @session_timer: check if peer keeps Tx-ing on the TID (by timeout value)
   * @reorder_timer: releases expired frames from the reorder buffer.
   * @last_rx: jiffies of last rx activity
   * @head_seq_num: head sequence number in reordering buffer.
   * @stored_mpdu_num: number of MPDUs in reordering buffer
   * @ssn: Starting Sequence Number expected to be aggregated.
   * @buf_size: buffer size for incoming A-MPDUs
   * @timeout: reset timer value (in TUs).
   * @dialog_token: dialog token for aggregation session
   * @rcu_head: RCU head used for freeing this struct
   * @reorder_lock: serializes access to reorder buffer, see below.
   *
   * This structure's lifetime is managed by RCU, assignments to
   * the array holding it must hold the aggregation mutex.
   *
   * The @reorder_lock is used to protect the members of this
   * struct, except for @timeout, @buf_size and @dialog_token,
   * which are constant across the lifetime of the struct (the
   * dialog token being used only for debugging).
   */
  struct tid_ampdu_rx {
  	struct rcu_head rcu_head;
  	spinlock_t reorder_lock;
  	struct sk_buff **reorder_buf;
  	unsigned long *reorder_time;
  	struct timer_list session_timer;
  	struct timer_list reorder_timer;
  	unsigned long last_rx;
  	u16 head_seq_num;
  	u16 stored_mpdu_num;
  	u16 ssn;
  	u16 buf_size;
  	u16 timeout;
  	u8 dialog_token;
  };
  
  /**
   * struct sta_ampdu_mlme - STA aggregation information.
   *
   * @tid_rx: aggregation info for Rx per TID -- RCU protected
   * @tid_tx: aggregation info for Tx per TID
   * @tid_start_tx: sessions where start was requested
   * @addba_req_num: number of times addBA request has been sent.
   * @last_addba_req_time: timestamp of the last addBA request.
   * @dialog_token_allocator: dialog token enumerator for each new session;
   * @work: work struct for starting/stopping aggregation
   * @tid_rx_timer_expired: bitmap indicating on which TIDs the
   *	RX timer expired until the work for it runs
   * @tid_rx_stop_requested:  bitmap indicating which BA sessions per TID the
   *	driver requested to close until the work for it runs
   * @mtx: mutex to protect all TX data (except non-NULL assignments
   *	to tid_tx[idx], which are protected by the sta spinlock)
   *	tid_start_tx is also protected by sta->lock.
   */
  struct sta_ampdu_mlme {
  	struct mutex mtx;
  	/* rx */
  	struct tid_ampdu_rx __rcu *tid_rx[IEEE80211_NUM_TIDS];
  	unsigned long tid_rx_timer_expired[BITS_TO_LONGS(IEEE80211_NUM_TIDS)];
  	unsigned long tid_rx_stop_requested[BITS_TO_LONGS(IEEE80211_NUM_TIDS)];
  	/* tx */
  	struct work_struct work;
  	struct tid_ampdu_tx __rcu *tid_tx[IEEE80211_NUM_TIDS];
  	struct tid_ampdu_tx *tid_start_tx[IEEE80211_NUM_TIDS];
  	unsigned long last_addba_req_time[IEEE80211_NUM_TIDS];
  	u8 addba_req_num[IEEE80211_NUM_TIDS];
  	u8 dialog_token_allocator;
  };
  
  /*
   * struct ieee80211_tx_latency_stat - Tx latency statistics
   *
   * Measures TX latency and jitter for a station per TID.
   *
   * @max: worst case latency
   * @sum: sum of all latencies
   * @counter: amount of Tx frames sent from interface
   * @bins: each bin counts how many frames transmitted within a certain
   * latency range. when disabled it is NULL.
   * @bin_count: amount of bins.
   */
  struct ieee80211_tx_latency_stat {
  	u32 max;
  	u32 sum;
  	u32 counter;
  	u32 *bins;
  	u32 bin_count;
  };
  
  /**
   * struct sta_info - STA information
   *
   * This structure collects information about a station that
   * mac80211 is communicating with.
   *
   * @list: global linked list entry
   * @free_list: list entry for keeping track of stations to free
   * @hnext: hash table linked list pointer
   * @local: pointer to the global information
   * @sdata: virtual interface this station belongs to
   * @ptk: peer keys negotiated with this station, if any
   * @ptk_idx: last installed peer key index
   * @gtk: group keys negotiated with this station, if any
   * @gtk_idx: last installed group key index
   * @rate_ctrl: rate control algorithm reference
   * @rate_ctrl_priv: rate control private per-STA pointer
   * @last_tx_rate: rate used for last transmit, to report to userspace as
   *	"the" transmit rate
   * @last_rx_rate_idx: rx status rate index of the last data packet
   * @last_rx_rate_flag: rx status flag of the last data packet
   * @last_rx_rate_vht_nss: rx status nss of last data packet
   * @lock: used for locking all fields that require locking, see comments
   *	in the header file.
   * @drv_unblock_wk: used for driver PS unblocking
   * @listen_interval: listen interval of this station, when we're acting as AP
   * @_flags: STA flags, see &enum ieee80211_sta_info_flags, do not use directly
   * @ps_lock: used for powersave (when mac80211 is the AP) related locking
   * @ps_tx_buf: buffers (per AC) of frames to transmit to this station
   *	when it leaves power saving state or polls
   * @tx_filtered: buffers (per AC) of frames we already tried to
   *	transmit but were filtered by hardware due to STA having
   *	entered power saving state, these are also delivered to
   *	the station when it leaves powersave or polls for frames
   * @driver_buffered_tids: bitmap of TIDs the driver has data buffered on
   * @rx_packets: Number of MSDUs received from this STA
   * @rx_bytes: Number of bytes received from this STA
   * @wep_weak_iv_count: number of weak WEP IVs received from this station
   * @last_rx: time (in jiffies) when last frame was received from this STA
   * @last_connected: time (in seconds) when a station got connected
   * @num_duplicates: number of duplicate frames received from this STA
   * @rx_fragments: number of received MPDUs
   * @rx_dropped: number of dropped MPDUs from this STA
   * @last_signal: signal of last received frame from this STA
   * @avg_signal: moving average of signal of received frames from this STA
   * @last_ack_signal: signal of last received Ack frame from this STA
   * @last_seq_ctrl: last received seq/frag number from this STA (per RX queue)
   * @tx_filtered_count: number of frames the hardware filtered for this STA
   * @tx_retry_failed: number of frames that failed retry
   * @tx_retry_count: total number of retries for frames to this STA
   * @fail_avg: moving percentage of failed MSDUs
   * @tx_packets: number of RX/TX MSDUs
   * @tx_bytes: number of bytes transmitted to this STA
   * @tx_fragments: number of transmitted MPDUs
   * @tid_seq: per-TID sequence numbers for sending to this STA
   * @ampdu_mlme: A-MPDU state machine state
   * @timer_to_tid: identity mapping to ID timers
   * @tx_lat: Tx latency statistics
   * @llid: Local link ID
   * @plid: Peer link ID
   * @reason: Cancel reason on PLINK_HOLDING state
   * @plink_retries: Retries in establishment
   * @ignore_plink_timer: ignore the peer-link timer (used internally)
   * @plink_state: peer link state
   * @plink_timeout: timeout of peer link
   * @plink_timer: peer link watch timer
   * @t_offset: timing offset relative to this host
   * @t_offset_setpoint: reference timing offset of this sta to be used when
   * 	calculating clockdrift
   * @local_pm: local link-specific power save mode
   * @peer_pm: peer-specific power save mode towards local STA
   * @nonpeer_pm: STA power save mode towards non-peer neighbors
   * @debugfs: debug filesystem info
   * @dead: set to true when sta is unlinked
   * @uploaded: set to true when sta is uploaded to the driver
   * @lost_packets: number of consecutive lost packets
   * @sta: station information we share with the driver
   * @sta_state: duplicates information about station state (for debug)
   * @beacon_loss_count: number of times beacon loss has triggered
   * @rcu_head: RCU head used for freeing this station struct
   * @cur_max_bandwidth: maximum bandwidth to use for TX to the station,
   *	taken from HT/VHT capabilities or VHT operating mode notification
   * @chains: chains ever used for RX from this station
   * @chain_signal_last: last signal (per chain)
   * @chain_signal_avg: signal average (per chain)
   * @known_smps_mode: the smps_mode the client thinks we are in. Relevant for
   *	AP only.
   * @cipher_scheme: optional cipher scheme for this station
   */
  struct sta_info {
  	/* General information, mostly static */
  	struct list_head list, free_list;
  	struct rcu_head rcu_head;
  	struct sta_info __rcu *hnext;
  	struct ieee80211_local *local;
  	struct ieee80211_sub_if_data *sdata;
  	struct ieee80211_key __rcu *gtk[NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS];
  	struct ieee80211_key __rcu *ptk[NUM_DEFAULT_KEYS];
  	u8 gtk_idx;
  	u8 ptk_idx;
  	struct rate_control_ref *rate_ctrl;
  	void *rate_ctrl_priv;
  	spinlock_t lock;
  
  	struct work_struct drv_unblock_wk;
  
  	u16 listen_interval;
  
  	bool dead;
  
  	bool uploaded;
  
  	enum ieee80211_sta_state sta_state;
  
  	/* use the accessors defined below */
  	unsigned long _flags;
  
  	/* STA powersave lock and frame queues */
  	spinlock_t ps_lock;
  	struct sk_buff_head ps_tx_buf[IEEE80211_NUM_ACS];
  	struct sk_buff_head tx_filtered[IEEE80211_NUM_ACS];
  	unsigned long driver_buffered_tids;
  
  	/* Updated from RX path only, no locking requirements */
  	unsigned long rx_packets;
  	u64 rx_bytes;
  	unsigned long wep_weak_iv_count;
  	unsigned long last_rx;
  	long last_connected;
  	unsigned long num_duplicates;
  	unsigned long rx_fragments;
  	unsigned long rx_dropped;
  	int last_signal;
  	struct ewma avg_signal;
  	int last_ack_signal;
  
  	u8 chains;
  	s8 chain_signal_last[IEEE80211_MAX_CHAINS];
  	struct ewma chain_signal_avg[IEEE80211_MAX_CHAINS];
  
  	/* Plus 1 for non-QoS frames */
  	__le16 last_seq_ctrl[IEEE80211_NUM_TIDS + 1];
  
  	/* Updated from TX status path only, no locking requirements */
  	unsigned long tx_filtered_count;
  	unsigned long tx_retry_failed, tx_retry_count;
  	/* moving percentage of failed MSDUs */
  	unsigned int fail_avg;
  
  	/* Updated from TX path only, no locking requirements */
  	u32 tx_fragments;
  	u64 tx_packets[IEEE80211_NUM_ACS];
  	u64 tx_bytes[IEEE80211_NUM_ACS];
  	struct ieee80211_tx_rate last_tx_rate;
  	int last_rx_rate_idx;
  	u32 last_rx_rate_flag;
  	u8 last_rx_rate_vht_nss;
  	u16 tid_seq[IEEE80211_QOS_CTL_TID_MASK + 1];
  
  	/*
  	 * Aggregation information, locked with lock.
  	 */
  	struct sta_ampdu_mlme ampdu_mlme;
  	u8 timer_to_tid[IEEE80211_NUM_TIDS];
  
  	struct ieee80211_tx_latency_stat *tx_lat;
  
  #ifdef CONFIG_MAC80211_MESH
  	/*
  	 * Mesh peer link attributes
  	 * TODO: move to a sub-structure that is referenced with pointer?
  	 */
  	u16 llid;
  	u16 plid;
  	u16 reason;
  	u8 plink_retries;
  	bool ignore_plink_timer;
  	enum nl80211_plink_state plink_state;
  	u32 plink_timeout;
  	struct timer_list plink_timer;
  	s64 t_offset;
  	s64 t_offset_setpoint;
  	/* mesh power save */
  	enum nl80211_mesh_power_mode local_pm;
  	enum nl80211_mesh_power_mode peer_pm;
  	enum nl80211_mesh_power_mode nonpeer_pm;
  #endif
  
  #ifdef CONFIG_MAC80211_DEBUGFS
  	struct sta_info_debugfsdentries {
  		struct dentry *dir;
  		bool add_has_run;
  	} debugfs;
  #endif
  
  	enum ieee80211_sta_rx_bandwidth cur_max_bandwidth;
  
  	unsigned int lost_packets;
  	unsigned int beacon_loss_count;
  
  	enum ieee80211_smps_mode known_smps_mode;
  	const struct ieee80211_cipher_scheme *cipher_scheme;
  
  	/* keep last! */
  	struct ieee80211_sta sta;
  };
  
  static inline enum nl80211_plink_state sta_plink_state(struct sta_info *sta)
  {
  #ifdef CONFIG_MAC80211_MESH
  	return sta->plink_state;
  #endif
  	return NL80211_PLINK_LISTEN;
  }
  
  static inline void set_sta_flag(struct sta_info *sta,
  				enum ieee80211_sta_info_flags flag)
  {
  	WARN_ON(flag == WLAN_STA_AUTH ||
  		flag == WLAN_STA_ASSOC ||
  		flag == WLAN_STA_AUTHORIZED);
  	set_bit(flag, &sta->_flags);
  }
  
  static inline void clear_sta_flag(struct sta_info *sta,
  				  enum ieee80211_sta_info_flags flag)
  {
  	WARN_ON(flag == WLAN_STA_AUTH ||
  		flag == WLAN_STA_ASSOC ||
  		flag == WLAN_STA_AUTHORIZED);
  	clear_bit(flag, &sta->_flags);
  }
  
  static inline int test_sta_flag(struct sta_info *sta,
  				enum ieee80211_sta_info_flags flag)
  {
  	return test_bit(flag, &sta->_flags);
  }
  
  static inline int test_and_clear_sta_flag(struct sta_info *sta,
  					  enum ieee80211_sta_info_flags flag)
  {
  	WARN_ON(flag == WLAN_STA_AUTH ||
  		flag == WLAN_STA_ASSOC ||
  		flag == WLAN_STA_AUTHORIZED);
  	return test_and_clear_bit(flag, &sta->_flags);
  }
  
  static inline int test_and_set_sta_flag(struct sta_info *sta,
  					enum ieee80211_sta_info_flags flag)
  {
  	WARN_ON(flag == WLAN_STA_AUTH ||
  		flag == WLAN_STA_ASSOC ||
  		flag == WLAN_STA_AUTHORIZED);
  	return test_and_set_bit(flag, &sta->_flags);
  }
  
  int sta_info_move_state(struct sta_info *sta,
  			enum ieee80211_sta_state new_state);
  
  static inline void sta_info_pre_move_state(struct sta_info *sta,
  					   enum ieee80211_sta_state new_state)
  {
  	int ret;
  
  	WARN_ON_ONCE(test_sta_flag(sta, WLAN_STA_INSERTED));
  
  	ret = sta_info_move_state(sta, new_state);
  	WARN_ON_ONCE(ret);
  }
  
  
  void ieee80211_assign_tid_tx(struct sta_info *sta, int tid,
  			     struct tid_ampdu_tx *tid_tx);
  
  static inline struct tid_ampdu_tx *
  rcu_dereference_protected_tid_tx(struct sta_info *sta, int tid)
  {
  	return rcu_dereference_protected(sta->ampdu_mlme.tid_tx[tid],
  					 lockdep_is_held(&sta->lock) ||
  					 lockdep_is_held(&sta->ampdu_mlme.mtx));
  }
  
  #define STA_HASH_SIZE 256
  #define STA_HASH(sta) (sta[5])
  
  
  /* Maximum number of frames to buffer per power saving station per AC */
  #define STA_MAX_TX_BUFFER	64
  
  /* Minimum buffered frame expiry time. If STA uses listen interval that is
   * smaller than this value, the minimum value here is used instead. */
  #define STA_TX_BUFFER_EXPIRE (10 * HZ)
  
  /* How often station data is cleaned up (e.g., expiration of buffered frames)
   */
  #define STA_INFO_CLEANUP_INTERVAL (10 * HZ)
  
  /*
   * Get a STA info, must be under RCU read lock.
   */
  struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
  			      const u8 *addr);
  
  struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
  				  const u8 *addr);
  
  static inline
  void for_each_sta_info_type_check(struct ieee80211_local *local,
  				  const u8 *addr,
  				  struct sta_info *sta,
  				  struct sta_info *nxt)
  {
  }
  
  #define for_each_sta_info(local, _addr, _sta, nxt)			\
  	for (	/* initialise loop */					\
  		_sta = rcu_dereference(local->sta_hash[STA_HASH(_addr)]),\
  		nxt = _sta ? rcu_dereference(_sta->hnext) : NULL;	\
  		/* typecheck */						\
  		for_each_sta_info_type_check(local, (_addr), _sta, nxt),\
  		/* continue condition */				\
  		_sta;							\
  		/* advance loop */					\
  		_sta = nxt,						\
  		nxt = _sta ? rcu_dereference(_sta->hnext) : NULL	\
  	     )								\
  	/* compare address and run code only if it matches */		\
  	if (ether_addr_equal(_sta->sta.addr, (_addr)))
  
  /*
   * Get STA info by index, BROKEN!
   */
  struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
  				     int idx);
  /*
   * Create a new STA info, caller owns returned structure
   * until sta_info_insert().
   */
  struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
  				const u8 *addr, gfp_t gfp);
  
  void sta_info_free(struct ieee80211_local *local, struct sta_info *sta);
  
  /*
   * Insert STA info into hash table/list, returns zero or a
   * -EEXIST if (if the same MAC address is already present).
   *
   * Calling the non-rcu version makes the caller relinquish,
   * the _rcu version calls read_lock_rcu() and must be called
   * without it held.
   */
  int sta_info_insert(struct sta_info *sta);
  int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU);
  
  int __must_check __sta_info_destroy(struct sta_info *sta);
  int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata,
  			  const u8 *addr);
  int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
  			      const u8 *addr);
  
  void sta_info_recalc_tim(struct sta_info *sta);
  
  void sta_info_init(struct ieee80211_local *local);
  void sta_info_stop(struct ieee80211_local *local);
  
  /**
   * sta_info_flush - flush matching STA entries from the STA table
   *
   * Returns the number of removed STA entries.
   *
   * @sdata: sdata to remove all stations from
   * @vlans: if the given interface is an AP interface, also flush VLANs
   */
  int __sta_info_flush(struct ieee80211_sub_if_data *sdata, bool vlans);
  
  static inline int sta_info_flush(struct ieee80211_sub_if_data *sdata)
  {
  	return __sta_info_flush(sdata, false);
  }
  
  void sta_set_rate_info_tx(struct sta_info *sta,
  			  const struct ieee80211_tx_rate *rate,
  			  struct rate_info *rinfo);
  void sta_set_rate_info_rx(struct sta_info *sta,
  			  struct rate_info *rinfo);
  void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
  			  unsigned long exp_time);
  u8 sta_info_tx_streams(struct sta_info *sta);
  
  void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta);
  void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta);
  void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta);
  
  #endif /* STA_INFO_H */