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 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_deliver_wk;
  u16 listen_interval;
  bool dead;
  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 rx_packets;
  u64 rx_bytes;
  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];
  __le16 last_seq_ctrl[IEEE80211_NUM_TIDS + 1];
  unsigned long tx_filtered_count;
  unsigned long tx_retry_failed;
  unsigned long tx_retry_count;
  unsigned int fail_avg;
  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;
  u32 last_rx_rate_vht_flag;
  u8 last_rx_rate_vht_nss;
  u16 tid_seq[IEEE80211_QOS_CTL_TID_MASK + 1];
  struct sta_ampdu_mlme ampdu_mlme;
  u8 timer_to_tid[IEEE80211_NUM_TIDS];
  struct ieee80211_tx_latency_stat * tx_lat;
#ifdef CONFIG_MAC80211_MESH
  u16 llid;
  u16 plid;
  u16 reason;
  u8 plink_retries;
  enum nl80211_plink_state plink_state;
  u32 plink_timeout;
  struct timer_list plink_timer;
  s64 t_offset;
  s64 t_offset_setpoint;
  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 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;
  unsigned long last_tdls_pkt_time;
  u8 reserved_tid;
  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

hnext
    hash table linked list pointer

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

gtk_idx
    last installed group key index

ptk_idx
    last installed peer key index

rate_ctrl
    rate control algorithm reference

rate_ctrl_priv
    rate control private per-STA pointer

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

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

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

rx_packets
    Number of MSDUs received from this STA

rx_bytes
    Number of bytes received from this STA

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

chains
    chains ever used for RX from this station

chain_signal_last[IEEE80211_MAX_CHAINS]
    last signal (per chain)

chain_signal_avg[IEEE80211_MAX_CHAINS]
    signal average (per chain)

last_seq_ctrl[IEEE80211_NUM_TIDS + 1]
    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_fragments
    number of transmitted MPDUs

tx_packets[IEEE80211_NUM_ACS]
    number of RX/TX MSDUs

tx_bytes[IEEE80211_NUM_ACS]
    number of bytes transmitted to this STA

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_flag
    rx status vht flag of the last data packet

last_rx_rate_vht_nss
    rx status nss of last data packet

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

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

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

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

lost_packets
    number of consecutive lost packets

beacon_loss_count
    number of times beacon loss has triggered

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

cipher_scheme
    optional cipher scheme for this station

last_tdls_pkt_time
    holds the time in jiffies of last TDLS pkt ACKed

reserved_tid
    reserved TID (if any, otherwise IEEE80211_TID_UNRESERVED)

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