path: root/net/mac80211/sta_info.h

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright 2002-2005, Devicescape Software, Inc.
 * Copyright 2013-2014  Intel Mobile Communications GmbH
 * Copyright(c) 2015-2017 Intel Deutschland GmbH
 * Copyright(c) 2020 Intel Corporation
 */

#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/bitfield.h>
#include <linux/etherdevice.h>
#include <linux/rhashtable.h>
#include <linux/u64_stats_sync.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_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_TDLS_INITIATOR: We are the initiator of the TDLS link with this
 *	station.
 * @WLAN_STA_TDLS_CHAN_SWITCH: This TDLS peer supports TDLS channel-switching
 * @WLAN_STA_TDLS_OFF_CHANNEL: The local STA is currently off-channel with this
 *	TDLS peer
 * @WLAN_STA_TDLS_WIDER_BW: This TDLS peer supports working on a wider bw on
 *	the BSS base channel.
 * @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.
 * @WLAN_STA_PS_DELIVER: station woke up, but we're still blocking TX
 *	until pending frames are delivered
 * @WLAN_STA_USES_ENCRYPTION: This station was configured for encryption,
 *	so drop all packets without a key later.
 *
 * @NUM_WLAN_STA_FLAGS: number of defined flags
 */
enum ieee80211_sta_info_flags {
	WLAN_STA_AUTH,
	WLAN_STA_ASSOC,
	WLAN_STA_PS_STA,
	WLAN_STA_AUTHORIZED,
	WLAN_STA_SHORT_PREAMBLE,
	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_TDLS_INITIATOR,
	WLAN_STA_TDLS_CHAN_SWITCH,
	WLAN_STA_TDLS_OFF_CHANNEL,
	WLAN_STA_TDLS_WIDER_BW,
	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,
	WLAN_STA_PS_DELIVER,
	WLAN_STA_USES_ENCRYPTION,

	NUM_WLAN_STA_FLAGS,
};

#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
#define HT_AGG_STATE_START_CB		6
#define HT_AGG_STATE_STOP_CB		7
#define HT_AGG_STATE_SENT_ADDBA		8

DECLARE_EWMA(avg_signal, 10, 8)
enum ieee80211_agg_stop_reason {
	AGG_STOP_DECLINED,
	AGG_STOP_LOCAL_REQUEST,
	AGG_STOP_PEER_REQUEST,
	AGG_STOP_DESTROY_STA,
};

/* Debugfs flags to enable/disable use of RX/TX airtime in scheduler */
#define AIRTIME_USE_TX		BIT(0)
#define AIRTIME_USE_RX		BIT(1)

struct airtime_info {
	u64 rx_airtime;
	u64 tx_airtime;
	s64 deficit;
	atomic_t aql_tx_pending; /* Estimated airtime for frames pending */
	u32 aql_limit_low;
	u32 aql_limit_high;
};

void ieee80211_sta_update_pending_airtime(struct ieee80211_local *local,
					  struct sta_info *sta, u8 ac,
					  u16 tx_airtime, bool tx_completed);

struct sta_info;

/**
 * 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
 * @sta: station we are attached to
 * @dialog_token: dialog token for aggregation session
 * @timeout: session timeout value to be filled in ADDBA requests
 * @tid: TID number
 * @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
 * @amsdu: support A-MSDU withing A-MDPU
 *
 * 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;
	struct sta_info *sta;
	unsigned long state;
	unsigned long last_tx;
	u16 timeout;
	u8 dialog_token;
	u8 stop_initiator;
	bool tx_stop;
	u16 buf_size;

	u16 failed_bar_ssn;
	bool bar_pending;
	bool amsdu;
	u8 tid;
};

/**
 * struct tid_ampdu_rx - TID aggregation information (Rx).
 *
 * @reorder_buf: buffer to reorder incoming aggregated MPDUs. An MPDU may be an
 *	A-MSDU with individually reported subframes.
 * @reorder_buf_filtered: bitmap indicating where there are filtered frames in
 *	the reorder buffer that should be ignored when releasing frames
 * @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.
 * @sta: station we are attached to
 * @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).
 * @tid: TID number
 * @rcu_head: RCU head used for freeing this struct
 * @reorder_lock: serializes access to reorder buffer, see below.
 * @auto_seq: used for offloaded BA sessions to automatically pick head_seq_and
 *	and ssn.
 * @removed: this session is removed (but might have been found due to RCU)
 * @started: this session has started (head ssn or higher was received)
 *
 * 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;
	u64 reorder_buf_filtered;
	struct sk_buff_head *reorder_buf;
	unsigned long *reorder_time;
	struct sta_info *sta;
	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 tid;
	u8 auto_seq:1,
	   removed:1,
	   started:1;
};

/**
 * struct sta_ampdu_mlme - STA aggregation information.
 *
 * @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.
 * @tid_rx: aggregation info for Rx per TID -- RCU protected
 * @tid_rx_token: dialog tokens for valid aggregation sessions
 * @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
 * @tid_rx_manage_offl: bitmap indicating which BA sessions were requested
 *	to be treated as started/stopped due to offloading
 * @agg_session_valid: bitmap indicating which TID has a rx BA session open on
 * @unexpected_agg: bitmap indicating which TID already sent a delBA due to
 *	unexpected aggregation related frames outside a session
 * @work: work struct for starting/stopping aggregation
 * @tid_tx: aggregation info for Tx per TID
 * @tid_start_tx: sessions where start was requested
 * @last_addba_req_time: timestamp of the last addBA request.
 * @addba_req_num: number of times addBA request has been sent.
 * @dialog_token_allocator: dialog token enumerator for each new session;
 */
struct sta_ampdu_mlme {
	struct mutex mtx;
	/* rx */
	struct tid_ampdu_rx __rcu *tid_rx[IEEE80211_NUM_TIDS];
	u8 tid_rx_token[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)];
	unsigned long tid_rx_manage_offl[BITS_TO_LONGS(2 * IEEE80211_NUM_TIDS)];
	unsigned long agg_session_valid[BITS_TO_LONGS(IEEE80211_NUM_TIDS)];
	unsigned