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STRUCT STA_INFO(9) Internals STRUCT STA_INFO(9)

NAME

struct_sta_info - STA information

SYNOPSIS

struct sta_info {


  struct list_head list;


  struct list_head free_list;


  struct rcu_head rcu_head;


  struct rhash_head hash_node;


  u8 addr[ETH_ALEN];


  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 ptk_idx;


  struct rate_control_ref * rate_ctrl;


  void * rate_ctrl_priv;


  spinlock_t rate_ctrl_lock;


  spinlock_t lock;


  struct ieee80211_fast_tx __rcu * fast_tx;


  struct ieee80211_fast_rx __rcu * fast_rx;


  struct ieee80211_sta_rx_stats __percpu * pcpu_rx_stats;
#ifdef CONFIG_MAC80211_MESH


  struct mesh_sta * mesh;
#endif


  struct work_struct drv_deliver_wk;


  u16 listen_interval;


  bool dead;


  bool removed;


  bool uploaded;


  enum ieee80211_sta_state sta_state;


  unsigned long _flags;


  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;


  unsigned long txq_buffered_tids;


  long last_connected;


  struct ieee80211_sta_rx_stats rx_stats;


  struct tx_stats;


  u16 tid_seq[IEEE80211_QOS_CTL_TID_MASK + 1];


  struct sta_ampdu_mlme ampdu_mlme;


  u8 timer_to_tid[IEEE80211_NUM_TIDS];
#ifdef CONFIG_MAC80211_DEBUGFS


  struct dentry * debugfs_dir;
#endif


  enum ieee80211_sta_rx_bandwidth cur_max_bandwidth;


  enum ieee80211_smps_mode known_smps_mode;


  const struct ieee80211_cipher_scheme * cipher_scheme;


  u8 reserved_tid;


  struct cfg80211_chan_def tdls_chandef;


  struct ieee80211_sta sta;
};

MEMBERS

list

global linked list entry

free_list

list entry for keeping track of stations to free

rcu_head

RCU head used for freeing this station struct

hash_node

hash node for rhashtable

addr[ETH_ALEN]

station's MAC address - duplicated from public part to let the hash table work with just a single cacheline

local

pointer to the global information

sdata

virtual interface this station belongs to

gtk[NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS]

group keys negotiated with this station, if any

ptk[NUM_DEFAULT_KEYS]

peer keys negotiated with this station, if any

ptk_idx

last installed peer key index

rate_ctrl

rate control algorithm reference

rate_ctrl_priv

rate control private per-STA pointer

rate_ctrl_lock

spinlock used to protect rate control data (data inside the algorithm, so serializes calls there)

lock

used for locking all fields that require locking, see comments in the header file.

fast_tx

TX fastpath information

fast_rx

RX fastpath information

pcpu_rx_stats

per-CPU RX statistics, assigned only if the driver needs this (by advertising the USES_RSS hw flag)

mesh

mesh STA information

drv_deliver_wk

used for delivering frames after driver PS unblocking

listen_interval

listen interval of this station, when we're acting as AP

dead

set to true when sta is unlinked

removed

set to true when sta is being removed from sta_list

uploaded

set to true when sta is uploaded to the driver

sta_state

duplicates information about station state (for debug)

_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[IEEE80211_NUM_ACS]

buffers (per AC) of frames to transmit to this station when it leaves power saving state or polls

tx_filtered[IEEE80211_NUM_ACS]

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

txq_buffered_tids

bitmap of TIDs that mac80211 has txq data buffered on

last_connected

time (in seconds) when a station got connected

rx_stats

RX statistics

tx_stats

TX statistics

tid_seq[IEEE80211_QOS_CTL_TID_MASK + 1]

per-TID sequence numbers for sending to this STA

ampdu_mlme

A-MPDU state machine state

timer_to_tid[IEEE80211_NUM_TIDS]

identity mapping to ID timers

debugfs_dir

debug filesystem directory dentry

cur_max_bandwidth

maximum bandwidth to use for TX to the station, taken from HT/VHT capabilities or VHT operating mode notification

known_smps_mode

the smps_mode the client thinks we are in. Relevant for AP only.

cipher_scheme

optional cipher scheme for this station

reserved_tid

reserved TID (if any, otherwise IEEE80211_TID_UNRESERVED)

tdls_chandef

a TDLS peer can have a wider chandef that is compatible to the BSS one.

sta

station information we share with the driver

DESCRIPTION

This structure collects information about a station that mac80211 is communicating with.

AUTHOR

Johannes Berg <johannes@sipsolutions.net>

Author.

COPYRIGHT

January 2017 Kernel Hackers Manual 4.8.