693b1bbcc4
This patch cleans up the sta_info struct and documents how each set of variables is locked. Notably, flags locking is completely missing. It also adds kernel-doc for some (but not all yet) members of the struct. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
346 lines
10 KiB
C
346 lines
10 KiB
C
/*
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* Copyright 2002-2005, Devicescape Software, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef STA_INFO_H
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#define STA_INFO_H
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#include <linux/list.h>
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#include <linux/types.h>
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#include <linux/if_ether.h>
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#include "ieee80211_key.h"
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/**
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* enum ieee80211_sta_info_flags - Stations flags
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*
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* These flags are used with &struct sta_info's @flags member.
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*
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* @WLAN_STA_AUTH: Station is authenticated.
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* @WLAN_STA_ASSOC: Station is associated.
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* @WLAN_STA_PS: Station is in power-save mode
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* @WLAN_STA_AUTHORIZED: Station is authorized to send/receive traffic.
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* This bit is always checked so needs to be enabled for all stations
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* when virtual port control is not in use.
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* @WLAN_STA_SHORT_PREAMBLE: Station is capable of receiving short-preamble
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* frames.
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* @WLAN_STA_ASSOC_AP: We're associated to that station, it is an AP.
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* @WLAN_STA_WME: Station is a QoS-STA.
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* @WLAN_STA_WDS: Station is one of our WDS peers.
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* @WLAN_STA_PSPOLL: Station has just PS-polled us.
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* @WLAN_STA_CLEAR_PS_FILT: Clear PS filter in hardware (using the
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* IEEE80211_TXCTL_CLEAR_PS_FILT control flag) when the next
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* frame to this station is transmitted.
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*/
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enum ieee80211_sta_info_flags {
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WLAN_STA_AUTH = 1<<0,
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WLAN_STA_ASSOC = 1<<1,
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WLAN_STA_PS = 1<<2,
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WLAN_STA_AUTHORIZED = 1<<3,
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WLAN_STA_SHORT_PREAMBLE = 1<<4,
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WLAN_STA_ASSOC_AP = 1<<5,
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WLAN_STA_WME = 1<<6,
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WLAN_STA_WDS = 1<<7,
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WLAN_STA_PSPOLL = 1<<8,
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WLAN_STA_CLEAR_PS_FILT = 1<<9,
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};
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#define STA_TID_NUM 16
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#define ADDBA_RESP_INTERVAL HZ
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#define HT_AGG_MAX_RETRIES (0x3)
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#define HT_AGG_STATE_INITIATOR_SHIFT (4)
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#define HT_ADDBA_REQUESTED_MSK BIT(0)
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#define HT_ADDBA_DRV_READY_MSK BIT(1)
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#define HT_ADDBA_RECEIVED_MSK BIT(2)
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#define HT_AGG_STATE_REQ_STOP_BA_MSK BIT(3)
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#define HT_AGG_STATE_INITIATOR_MSK BIT(HT_AGG_STATE_INITIATOR_SHIFT)
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#define HT_AGG_STATE_IDLE (0x0)
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#define HT_AGG_STATE_OPERATIONAL (HT_ADDBA_REQUESTED_MSK | \
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HT_ADDBA_DRV_READY_MSK | \
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HT_ADDBA_RECEIVED_MSK)
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/**
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* struct tid_ampdu_tx - TID aggregation information (Tx).
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*
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* @state: TID's state in session state machine.
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* @dialog_token: dialog token for aggregation session
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* @ssn: Starting Sequence Number expected to be aggregated.
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* @addba_resp_timer: timer for peer's response to addba request
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* @addba_req_num: number of times addBA request has been sent.
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*/
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struct tid_ampdu_tx {
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u8 state;
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u8 dialog_token;
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u16 ssn;
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struct timer_list addba_resp_timer;
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u8 addba_req_num;
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};
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/**
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* struct tid_ampdu_rx - TID aggregation information (Rx).
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*
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* @state: TID's state in session state machine.
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* @dialog_token: dialog token for aggregation session
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* @ssn: Starting Sequence Number expected to be aggregated.
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* @buf_size: buffer size for incoming A-MPDUs
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* @timeout: reset timer value.
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* @head_seq_num: head sequence number in reordering buffer.
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* @stored_mpdu_num: number of MPDUs in reordering buffer
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* @reorder_buf: buffer to reorder incoming aggregated MPDUs
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* @session_timer: check if peer keeps Tx-ing on the TID (by timeout value)
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*/
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struct tid_ampdu_rx {
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u8 state;
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u8 dialog_token;
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u16 ssn;
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u16 buf_size;
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u16 timeout;
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u16 head_seq_num;
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u16 stored_mpdu_num;
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struct sk_buff **reorder_buf;
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struct timer_list session_timer;
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};
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enum plink_state {
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LISTEN,
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OPN_SNT,
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OPN_RCVD,
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CNF_RCVD,
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ESTAB,
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HOLDING,
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BLOCKED
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};
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/**
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* struct sta_ampdu_mlme - STA aggregation information.
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*
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* @tid_rx: aggregation info for Rx per TID
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* @tid_tx: aggregation info for Tx per TID
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* @ampdu_rx: for locking sections in aggregation Rx flow
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* @ampdu_tx: for locking sectionsi in aggregation Tx flow
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* @dialog_token_allocator: dialog token enumerator for each new session;
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*/
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struct sta_ampdu_mlme {
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struct tid_ampdu_rx tid_rx[STA_TID_NUM];
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struct tid_ampdu_tx tid_tx[STA_TID_NUM];
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spinlock_t ampdu_rx;
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spinlock_t ampdu_tx;
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u8 dialog_token_allocator;
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};
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/* see __sta_info_unlink */
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#define STA_INFO_PIN_STAT_NORMAL 0
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#define STA_INFO_PIN_STAT_PINNED 1
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#define STA_INFO_PIN_STAT_DESTROY 2
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/**
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* struct sta_info - STA information
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*
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* This structure collects information about a station that
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* mac80211 is communicating with.
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*
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* @list: global linked list entry
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* @hnext: hash table linked list pointer
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* @local: pointer to the global information
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* @addr: MAC address of this STA
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* @aid: STA's unique AID (1..2007, 0 = not assigned yet),
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* only used in AP (and IBSS?) mode
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* @flags: STA flags, see &enum ieee80211_sta_info_flags
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* @ps_tx_buf: buffer of frames to transmit to this station
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* when it leaves power saving state
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* @tx_filtered: buffer of frames we already tried to transmit
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* but were filtered by hardware due to STA having entered
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* power saving state
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* @rx_packets: Number of MSDUs received from this STA
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* @rx_bytes: Number of bytes received from this STA
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* @supp_rates: Bitmap of supported rates (per band)
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* @ht_info: HT capabilities of this STA
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*/
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struct sta_info {
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/* General information, mostly static */
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struct list_head list;
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struct sta_info *hnext;
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struct ieee80211_local *local;
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struct ieee80211_sub_if_data *sdata;
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struct ieee80211_key *key;
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struct rate_control_ref *rate_ctrl;
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void *rate_ctrl_priv;
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struct ieee80211_ht_info ht_info;
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u64 supp_rates[IEEE80211_NUM_BANDS];
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u8 addr[ETH_ALEN];
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u16 aid;
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u16 listen_interval;
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/*
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* for use by the internal lifetime management,
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* see __sta_info_unlink
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*/
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u8 pin_status;
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/* frequently updated information, needs locking? */
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u32 flags;
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/*
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* STA powersave frame queues, no more than the internal
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* locking required.
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*/
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struct sk_buff_head ps_tx_buf;
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struct sk_buff_head tx_filtered;
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/* Updated from RX path only, no locking requirements */
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unsigned long rx_packets, rx_bytes;
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unsigned long wep_weak_iv_count;
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unsigned long last_rx;
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unsigned long num_duplicates; /* number of duplicate frames received
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* from this STA */
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unsigned long rx_fragments; /* number of received MPDUs */
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unsigned long rx_dropped; /* number of dropped MPDUs from this STA */
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int last_rssi; /* RSSI of last received frame from this STA */
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int last_signal; /* signal of last received frame from this STA */
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int last_noise; /* noise of last received frame from this STA */
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/* last received seq/frag number from this STA (per RX queue) */
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__le16 last_seq_ctrl[NUM_RX_DATA_QUEUES];
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#ifdef CONFIG_MAC80211_DEBUG_COUNTERS
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unsigned int wme_rx_queue[NUM_RX_DATA_QUEUES];
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#endif
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/* Updated from TX status path only, no locking requirements */
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unsigned long tx_filtered_count;
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unsigned long tx_retry_failed, tx_retry_count;
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/* TODO: update in generic code not rate control? */
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u32 tx_num_consecutive_failures;
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u32 tx_num_mpdu_ok;
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u32 tx_num_mpdu_fail;
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/* moving percentage of failed MSDUs */
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unsigned int fail_avg;
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/* Updated from TX path only, no locking requirements */
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unsigned long tx_packets; /* number of RX/TX MSDUs */
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unsigned long tx_bytes;
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unsigned long tx_fragments; /* number of transmitted MPDUs */
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int txrate_idx;
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int last_txrate_idx;
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#ifdef CONFIG_MAC80211_DEBUG_COUNTERS
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unsigned int wme_tx_queue[NUM_RX_DATA_QUEUES];
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#endif
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/* Debug counters, no locking doesn't matter */
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int channel_use;
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int channel_use_raw;
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/*
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* Aggregation information, comes with own locking.
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*/
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struct sta_ampdu_mlme ampdu_mlme;
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u8 timer_to_tid[STA_TID_NUM]; /* identity mapping to ID timers */
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u8 tid_to_tx_q[STA_TID_NUM]; /* map tid to tx queue */
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#ifdef CONFIG_MAC80211_MESH
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/*
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* Mesh peer link attributes
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* TODO: move to a sub-structure that is referenced with pointer?
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*/
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__le16 llid; /* Local link ID */
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__le16 plid; /* Peer link ID */
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__le16 reason; /* Buffer for cancel reason on HOLDING state */
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u8 plink_retries; /* Retries in establishment */
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bool ignore_plink_timer;
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enum plink_state plink_state;
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u32 plink_timeout;
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struct timer_list plink_timer;
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spinlock_t plink_lock; /* For peer_state reads / updates and other
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updates in the structure. Ensures robust
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transitions for the peerlink FSM */
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#endif
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#ifdef CONFIG_MAC80211_DEBUGFS
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struct sta_info_debugfsdentries {
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struct dentry *dir;
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struct dentry *flags;
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struct dentry *num_ps_buf_frames;
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struct dentry *inactive_ms;
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struct dentry *last_seq_ctrl;
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#ifdef CONFIG_MAC80211_DEBUG_COUNTERS
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struct dentry *wme_rx_queue;
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struct dentry *wme_tx_queue;
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#endif
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struct dentry *agg_status;
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} debugfs;
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#endif
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};
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static inline enum plink_state sta_plink_state(struct sta_info *sta)
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{
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#ifdef CONFIG_MAC80211_MESH
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return sta->plink_state;
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#endif
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return LISTEN;
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}
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/* Maximum number of concurrently registered stations */
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#define MAX_STA_COUNT 2007
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#define STA_HASH_SIZE 256
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#define STA_HASH(sta) (sta[5])
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/* Maximum number of frames to buffer per power saving station */
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#define STA_MAX_TX_BUFFER 128
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/* Minimum buffered frame expiry time. If STA uses listen interval that is
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* smaller than this value, the minimum value here is used instead. */
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#define STA_TX_BUFFER_EXPIRE (10 * HZ)
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/* How often station data is cleaned up (e.g., expiration of buffered frames)
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*/
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#define STA_INFO_CLEANUP_INTERVAL (10 * HZ)
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/*
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* Get a STA info, must have be under RCU read lock.
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*/
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struct sta_info *sta_info_get(struct ieee80211_local *local, u8 *addr);
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/*
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* Get STA info by index, BROKEN!
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*/
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struct sta_info *sta_info_get_by_idx(struct ieee80211_local *local, int idx,
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struct net_device *dev);
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/*
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* Create a new STA info, caller owns returned structure
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* until sta_info_insert().
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*/
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struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
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u8 *addr, gfp_t gfp);
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/*
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* Insert STA info into hash table/list, returns zero or a
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* -EEXIST if (if the same MAC address is already present).
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*
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* Calling this without RCU protection makes the caller
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* relinquish its reference to @sta.
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*/
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int sta_info_insert(struct sta_info *sta);
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/*
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* Unlink a STA info from the hash table/list.
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* This can NULL the STA pointer if somebody else
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* has already unlinked it.
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*/
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void sta_info_unlink(struct sta_info **sta);
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void sta_info_destroy(struct sta_info *sta);
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void sta_info_set_tim_bit(struct sta_info *sta);
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void sta_info_clear_tim_bit(struct sta_info *sta);
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void sta_info_init(struct ieee80211_local *local);
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int sta_info_start(struct ieee80211_local *local);
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void sta_info_stop(struct ieee80211_local *local);
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void sta_info_flush(struct ieee80211_local *local,
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struct ieee80211_sub_if_data *sdata);
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#endif /* STA_INFO_H */
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