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Test Your Knowledge in Computers #567
Difficulty: Medium
The ternary if-then-else operator generally has the following syntax: E ? X : Y where E is a Boolean expression and if true, the statement is assigned the value Y.
True or False?
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struct_sta_info(9) [centos man page]

struct_sta_info - STA information SYNOPSIS
struct sta_info { struct list_head 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; 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; unsigned long _flags; 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 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; __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; 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]; #ifdef CONFIG_MAC80211_MESH __le16 llid; __le16 plid; __le16 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; 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; struct ieee80211_sta sta; }; MEMBERS
list global linked list entry 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 peer key negotiated with this station, if any 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_unblock_wk used for 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_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 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[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_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 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 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 sta station information we share with the driver DESCRIPTION
This structure collects information about a station that mac80211 is communicating with. AUTHOR
Johannes Berg <> Author. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 STRUCT STA_INFO(9)

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