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mac80211: clean up sta_info and document locking
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>
This commit is contained in:
Johannes Berg
John W. Linville
parent
73651ee639
commit
693b1bbcc4
2 changed files with 90 additions and 61 deletions
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@ -67,7 +67,7 @@ STA_FILE(last_rssi, last_rssi, D);
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STA_FILE(last_signal, last_signal, D);
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STA_FILE(last_noise, last_noise, D);
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STA_FILE(channel_use, channel_use, D);
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STA_FILE(wep_weak_iv_count, wep_weak_iv_count, D);
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STA_FILE(wep_weak_iv_count, wep_weak_iv_count, LU);
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static ssize_t sta_flags_read(struct file *file, char __user *userbuf,
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size_t count, loff_t *ppos)
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@ -139,69 +139,42 @@ struct sta_ampdu_mlme {
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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; /* next entry in hash table list */
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struct sta_info *hnext;
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struct ieee80211_local *local;
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u8 addr[ETH_ALEN];
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u16 aid; /* STA's unique AID (1..2007), 0 = not yet assigned */
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u32 flags; /* WLAN_STA_ */
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struct sk_buff_head ps_tx_buf; /* buffer of TX frames for station in
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* power saving state */
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struct sk_buff_head tx_filtered; /* buffer of TX frames that were
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* already given to low-level driver,
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* but were filtered */
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unsigned long rx_packets, tx_packets; /* number of RX/TX MSDUs */
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unsigned long rx_bytes, tx_bytes;
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unsigned long tx_retry_failed, tx_retry_count;
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unsigned long tx_filtered_count;
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/* moving percentage of failed MSDUs */
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unsigned int fail_avg;
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unsigned int wep_weak_iv_count; /* number of RX frames with weak IV */
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unsigned long last_rx;
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/* bitmap of supported rates per band */
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u64 supp_rates[IEEE80211_NUM_BANDS];
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int txrate_idx;
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/* last rates used to send a frame to this STA */
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int last_txrate_idx, last_nonerp_txrate_idx;
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/* sub_if_data this sta belongs to */
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struct ieee80211_sub_if_data *sdata;
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struct ieee80211_key *key;
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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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struct rate_control_ref *rate_ctrl;
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void *rate_ctrl_priv;
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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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unsigned long num_duplicates; /* number of duplicate frames received
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* from this STA */
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unsigned long tx_fragments; /* number of transmitted MPDUs */
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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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int channel_use;
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int channel_use_raw;
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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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unsigned int wme_tx_queue[NUM_RX_DATA_QUEUES];
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#endif /* CONFIG_MAC80211_DEBUG_COUNTERS */
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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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@ -210,13 +183,69 @@ struct sta_info {
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*/
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u8 pin_status;
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struct ieee80211_ht_info ht_info; /* 802.11n HT capabilities
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of this STA */
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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]; /* convert timer id to tid */
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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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/* mesh peer link attributes */
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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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