sta_info.h 21 KB

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  1. /*
  2. * Copyright 2002-2005, Devicescape Software, Inc.
  3. *
  4. * This program is free software; you can redistribute it and/or modify
  5. * it under the terms of the GNU General Public License version 2 as
  6. * published by the Free Software Foundation.
  7. */
  8. #ifndef STA_INFO_H
  9. #define STA_INFO_H
  10. #include <linux/list.h>
  11. #include <linux/types.h>
  12. #include <linux/if_ether.h>
  13. #include <linux/workqueue.h>
  14. #include <linux/average.h>
  15. #include <linux/etherdevice.h>
  16. #include "key.h"
  17. /**
  18. * enum ieee80211_sta_info_flags - Stations flags
  19. *
  20. * These flags are used with &struct sta_info's @flags member, but
  21. * only indirectly with set_sta_flag() and friends.
  22. *
  23. * @WLAN_STA_AUTH: Station is authenticated.
  24. * @WLAN_STA_ASSOC: Station is associated.
  25. * @WLAN_STA_PS_STA: Station is in power-save mode
  26. * @WLAN_STA_AUTHORIZED: Station is authorized to send/receive traffic.
  27. * This bit is always checked so needs to be enabled for all stations
  28. * when virtual port control is not in use.
  29. * @WLAN_STA_SHORT_PREAMBLE: Station is capable of receiving short-preamble
  30. * frames.
  31. * @WLAN_STA_WME: Station is a QoS-STA.
  32. * @WLAN_STA_WDS: Station is one of our WDS peers.
  33. * @WLAN_STA_CLEAR_PS_FILT: Clear PS filter in hardware (using the
  34. * IEEE80211_TX_CTL_CLEAR_PS_FILT control flag) when the next
  35. * frame to this station is transmitted.
  36. * @WLAN_STA_MFP: Management frame protection is used with this STA.
  37. * @WLAN_STA_BLOCK_BA: Used to deny ADDBA requests (both TX and RX)
  38. * during suspend/resume and station removal.
  39. * @WLAN_STA_PS_DRIVER: driver requires keeping this station in
  40. * power-save mode logically to flush frames that might still
  41. * be in the queues
  42. * @WLAN_STA_PSPOLL: Station sent PS-poll while driver was keeping
  43. * station in power-save mode, reply when the driver unblocks.
  44. * @WLAN_STA_TDLS_PEER: Station is a TDLS peer.
  45. * @WLAN_STA_TDLS_PEER_AUTH: This TDLS peer is authorized to send direct
  46. * packets. This means the link is enabled.
  47. * @WLAN_STA_UAPSD: Station requested unscheduled SP while driver was
  48. * keeping station in power-save mode, reply when the driver
  49. * unblocks the station.
  50. * @WLAN_STA_SP: Station is in a service period, so don't try to
  51. * reply to other uAPSD trigger frames or PS-Poll.
  52. * @WLAN_STA_4ADDR_EVENT: 4-addr event was already sent for this frame.
  53. * @WLAN_STA_INSERTED: This station is inserted into the hash table.
  54. * @WLAN_STA_RATE_CONTROL: rate control was initialized for this station.
  55. * @WLAN_STA_TOFFSET_KNOWN: toffset calculated for this station is valid.
  56. * @WLAN_STA_MPSP_OWNER: local STA is owner of a mesh Peer Service Period.
  57. * @WLAN_STA_MPSP_RECIPIENT: local STA is recipient of a MPSP.
  58. */
  59. enum ieee80211_sta_info_flags {
  60. WLAN_STA_AUTH,
  61. WLAN_STA_ASSOC,
  62. WLAN_STA_PS_STA,
  63. WLAN_STA_AUTHORIZED,
  64. WLAN_STA_SHORT_PREAMBLE,
  65. WLAN_STA_WME,
  66. WLAN_STA_WDS,
  67. WLAN_STA_CLEAR_PS_FILT,
  68. WLAN_STA_MFP,
  69. WLAN_STA_BLOCK_BA,
  70. WLAN_STA_PS_DRIVER,
  71. WLAN_STA_PSPOLL,
  72. WLAN_STA_TDLS_PEER,
  73. WLAN_STA_TDLS_PEER_AUTH,
  74. WLAN_STA_UAPSD,
  75. WLAN_STA_SP,
  76. WLAN_STA_4ADDR_EVENT,
  77. WLAN_STA_INSERTED,
  78. WLAN_STA_RATE_CONTROL,
  79. WLAN_STA_TOFFSET_KNOWN,
  80. WLAN_STA_MPSP_OWNER,
  81. WLAN_STA_MPSP_RECIPIENT,
  82. };
  83. #define ADDBA_RESP_INTERVAL HZ
  84. #define HT_AGG_MAX_RETRIES 15
  85. #define HT_AGG_BURST_RETRIES 3
  86. #define HT_AGG_RETRIES_PERIOD (15 * HZ)
  87. #define HT_AGG_STATE_DRV_READY 0
  88. #define HT_AGG_STATE_RESPONSE_RECEIVED 1
  89. #define HT_AGG_STATE_OPERATIONAL 2
  90. #define HT_AGG_STATE_STOPPING 3
  91. #define HT_AGG_STATE_WANT_START 4
  92. #define HT_AGG_STATE_WANT_STOP 5
  93. enum ieee80211_agg_stop_reason {
  94. AGG_STOP_DECLINED,
  95. AGG_STOP_LOCAL_REQUEST,
  96. AGG_STOP_PEER_REQUEST,
  97. AGG_STOP_DESTROY_STA,
  98. };
  99. /**
  100. * struct tid_ampdu_tx - TID aggregation information (Tx).
  101. *
  102. * @rcu_head: rcu head for freeing structure
  103. * @session_timer: check if we keep Tx-ing on the TID (by timeout value)
  104. * @addba_resp_timer: timer for peer's response to addba request
  105. * @pending: pending frames queue -- use sta's spinlock to protect
  106. * @dialog_token: dialog token for aggregation session
  107. * @timeout: session timeout value to be filled in ADDBA requests
  108. * @state: session state (see above)
  109. * @last_tx: jiffies of last tx activity
  110. * @stop_initiator: initiator of a session stop
  111. * @tx_stop: TX DelBA frame when stopping
  112. * @buf_size: reorder buffer size at receiver
  113. * @failed_bar_ssn: ssn of the last failed BAR tx attempt
  114. * @bar_pending: BAR needs to be re-sent
  115. *
  116. * This structure's lifetime is managed by RCU, assignments to
  117. * the array holding it must hold the aggregation mutex.
  118. *
  119. * The TX path can access it under RCU lock-free if, and
  120. * only if, the state has the flag %HT_AGG_STATE_OPERATIONAL
  121. * set. Otherwise, the TX path must also acquire the spinlock
  122. * and re-check the state, see comments in the tx code
  123. * touching it.
  124. */
  125. struct tid_ampdu_tx {
  126. struct rcu_head rcu_head;
  127. struct timer_list session_timer;
  128. struct timer_list addba_resp_timer;
  129. struct sk_buff_head pending;
  130. unsigned long state;
  131. unsigned long last_tx;
  132. u16 timeout;
  133. u8 dialog_token;
  134. u8 stop_initiator;
  135. bool tx_stop;
  136. u8 buf_size;
  137. u16 failed_bar_ssn;
  138. bool bar_pending;
  139. };
  140. /**
  141. * struct tid_ampdu_rx - TID aggregation information (Rx).
  142. *
  143. * @reorder_buf: buffer to reorder incoming aggregated MPDUs
  144. * @reorder_time: jiffies when skb was added
  145. * @session_timer: check if peer keeps Tx-ing on the TID (by timeout value)
  146. * @reorder_timer: releases expired frames from the reorder buffer.
  147. * @last_rx: jiffies of last rx activity
  148. * @head_seq_num: head sequence number in reordering buffer.
  149. * @stored_mpdu_num: number of MPDUs in reordering buffer
  150. * @ssn: Starting Sequence Number expected to be aggregated.
  151. * @buf_size: buffer size for incoming A-MPDUs
  152. * @timeout: reset timer value (in TUs).
  153. * @dialog_token: dialog token for aggregation session
  154. * @rcu_head: RCU head used for freeing this struct
  155. * @reorder_lock: serializes access to reorder buffer, see below.
  156. *
  157. * This structure's lifetime is managed by RCU, assignments to
  158. * the array holding it must hold the aggregation mutex.
  159. *
  160. * The @reorder_lock is used to protect the members of this
  161. * struct, except for @timeout, @buf_size and @dialog_token,
  162. * which are constant across the lifetime of the struct (the
  163. * dialog token being used only for debugging).
  164. */
  165. struct tid_ampdu_rx {
  166. struct rcu_head rcu_head;
  167. spinlock_t reorder_lock;
  168. struct sk_buff **reorder_buf;
  169. unsigned long *reorder_time;
  170. struct timer_list session_timer;
  171. struct timer_list reorder_timer;
  172. unsigned long last_rx;
  173. u16 head_seq_num;
  174. u16 stored_mpdu_num;
  175. u16 ssn;
  176. u16 buf_size;
  177. u16 timeout;
  178. u8 dialog_token;
  179. };
  180. /**
  181. * struct sta_ampdu_mlme - STA aggregation information.
  182. *
  183. * @tid_rx: aggregation info for Rx per TID -- RCU protected
  184. * @tid_tx: aggregation info for Tx per TID
  185. * @tid_start_tx: sessions where start was requested
  186. * @addba_req_num: number of times addBA request has been sent.
  187. * @last_addba_req_time: timestamp of the last addBA request.
  188. * @dialog_token_allocator: dialog token enumerator for each new session;
  189. * @work: work struct for starting/stopping aggregation
  190. * @tid_rx_timer_expired: bitmap indicating on which TIDs the
  191. * RX timer expired until the work for it runs
  192. * @tid_rx_stop_requested: bitmap indicating which BA sessions per TID the
  193. * driver requested to close until the work for it runs
  194. * @mtx: mutex to protect all TX data (except non-NULL assignments
  195. * to tid_tx[idx], which are protected by the sta spinlock)
  196. * tid_start_tx is also protected by sta->lock.
  197. */
  198. struct sta_ampdu_mlme {
  199. struct mutex mtx;
  200. /* rx */
  201. struct tid_ampdu_rx __rcu *tid_rx[IEEE80211_NUM_TIDS];
  202. unsigned long tid_rx_timer_expired[BITS_TO_LONGS(IEEE80211_NUM_TIDS)];
  203. unsigned long tid_rx_stop_requested[BITS_TO_LONGS(IEEE80211_NUM_TIDS)];
  204. /* tx */
  205. struct work_struct work;
  206. struct tid_ampdu_tx __rcu *tid_tx[IEEE80211_NUM_TIDS];
  207. struct tid_ampdu_tx *tid_start_tx[IEEE80211_NUM_TIDS];
  208. unsigned long last_addba_req_time[IEEE80211_NUM_TIDS];
  209. u8 addba_req_num[IEEE80211_NUM_TIDS];
  210. u8 dialog_token_allocator;
  211. };
  212. /**
  213. * struct sta_info - STA information
  214. *
  215. * This structure collects information about a station that
  216. * mac80211 is communicating with.
  217. *
  218. * @list: global linked list entry
  219. * @hnext: hash table linked list pointer
  220. * @local: pointer to the global information
  221. * @sdata: virtual interface this station belongs to
  222. * @ptk: peer key negotiated with this station, if any
  223. * @gtk: group keys negotiated with this station, if any
  224. * @rate_ctrl: rate control algorithm reference
  225. * @rate_ctrl_priv: rate control private per-STA pointer
  226. * @last_tx_rate: rate used for last transmit, to report to userspace as
  227. * "the" transmit rate
  228. * @last_rx_rate_idx: rx status rate index of the last data packet
  229. * @last_rx_rate_flag: rx status flag of the last data packet
  230. * @last_rx_rate_vht_nss: rx status nss of last data packet
  231. * @lock: used for locking all fields that require locking, see comments
  232. * in the header file.
  233. * @drv_unblock_wk: used for driver PS unblocking
  234. * @listen_interval: listen interval of this station, when we're acting as AP
  235. * @_flags: STA flags, see &enum ieee80211_sta_info_flags, do not use directly
  236. * @ps_tx_buf: buffers (per AC) of frames to transmit to this station
  237. * when it leaves power saving state or polls
  238. * @tx_filtered: buffers (per AC) of frames we already tried to
  239. * transmit but were filtered by hardware due to STA having
  240. * entered power saving state, these are also delivered to
  241. * the station when it leaves powersave or polls for frames
  242. * @driver_buffered_tids: bitmap of TIDs the driver has data buffered on
  243. * @rx_packets: Number of MSDUs received from this STA
  244. * @rx_bytes: Number of bytes received from this STA
  245. * @wep_weak_iv_count: number of weak WEP IVs received from this station
  246. * @last_rx: time (in jiffies) when last frame was received from this STA
  247. * @last_connected: time (in seconds) when a station got connected
  248. * @num_duplicates: number of duplicate frames received from this STA
  249. * @rx_fragments: number of received MPDUs
  250. * @rx_dropped: number of dropped MPDUs from this STA
  251. * @last_signal: signal of last received frame from this STA
  252. * @avg_signal: moving average of signal of received frames from this STA
  253. * @last_ack_signal: signal of last received Ack frame from this STA
  254. * @last_seq_ctrl: last received seq/frag number from this STA (per RX queue)
  255. * @tx_filtered_count: number of frames the hardware filtered for this STA
  256. * @tx_retry_failed: number of frames that failed retry
  257. * @tx_retry_count: total number of retries for frames to this STA
  258. * @fail_avg: moving percentage of failed MSDUs
  259. * @tx_packets: number of RX/TX MSDUs
  260. * @tx_bytes: number of bytes transmitted to this STA
  261. * @tx_fragments: number of transmitted MPDUs
  262. * @tid_seq: per-TID sequence numbers for sending to this STA
  263. * @ampdu_mlme: A-MPDU state machine state
  264. * @timer_to_tid: identity mapping to ID timers
  265. * @llid: Local link ID
  266. * @plid: Peer link ID
  267. * @reason: Cancel reason on PLINK_HOLDING state
  268. * @plink_retries: Retries in establishment
  269. * @ignore_plink_timer: ignore the peer-link timer (used internally)
  270. * @plink_state: peer link state
  271. * @plink_timeout: timeout of peer link
  272. * @plink_timer: peer link watch timer
  273. * @t_offset: timing offset relative to this host
  274. * @t_offset_setpoint: reference timing offset of this sta to be used when
  275. * calculating clockdrift
  276. * @local_pm: local link-specific power save mode
  277. * @peer_pm: peer-specific power save mode towards local STA
  278. * @nonpeer_pm: STA power save mode towards non-peer neighbors
  279. * @debugfs: debug filesystem info
  280. * @dead: set to true when sta is unlinked
  281. * @uploaded: set to true when sta is uploaded to the driver
  282. * @lost_packets: number of consecutive lost packets
  283. * @sta: station information we share with the driver
  284. * @sta_state: duplicates information about station state (for debug)
  285. * @beacon_loss_count: number of times beacon loss has triggered
  286. * @rcu_head: RCU head used for freeing this station struct
  287. * @cur_max_bandwidth: maximum bandwidth to use for TX to the station,
  288. * taken from HT/VHT capabilities or VHT operating mode notification
  289. * @chains: chains ever used for RX from this station
  290. * @chain_signal_last: last signal (per chain)
  291. * @chain_signal_avg: signal average (per chain)
  292. */
  293. struct sta_info {
  294. /* General information, mostly static */
  295. struct list_head list;
  296. struct rcu_head rcu_head;
  297. struct sta_info __rcu *hnext;
  298. struct ieee80211_local *local;
  299. struct ieee80211_sub_if_data *sdata;
  300. struct ieee80211_key __rcu *gtk[NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS];
  301. struct ieee80211_key __rcu *ptk;
  302. struct rate_control_ref *rate_ctrl;
  303. void *rate_ctrl_priv;
  304. spinlock_t lock;
  305. struct work_struct drv_unblock_wk;
  306. u16 listen_interval;
  307. bool dead;
  308. bool uploaded;
  309. enum ieee80211_sta_state sta_state;
  310. /* use the accessors defined below */
  311. unsigned long _flags;
  312. /*
  313. * STA powersave frame queues, no more than the internal
  314. * locking required.
  315. */
  316. struct sk_buff_head ps_tx_buf[IEEE80211_NUM_ACS];
  317. struct sk_buff_head tx_filtered[IEEE80211_NUM_ACS];
  318. unsigned long driver_buffered_tids;
  319. /* Updated from RX path only, no locking requirements */
  320. unsigned long rx_packets;
  321. u64 rx_bytes;
  322. unsigned long wep_weak_iv_count;
  323. unsigned long last_rx;
  324. long last_connected;
  325. unsigned long num_duplicates;
  326. unsigned long rx_fragments;
  327. unsigned long rx_dropped;
  328. int last_signal;
  329. struct ewma avg_signal;
  330. int last_ack_signal;
  331. u8 chains;
  332. s8 chain_signal_last[IEEE80211_MAX_CHAINS];
  333. struct ewma chain_signal_avg[IEEE80211_MAX_CHAINS];
  334. /* Plus 1 for non-QoS frames */
  335. __le16 last_seq_ctrl[IEEE80211_NUM_TIDS + 1];
  336. /* Updated from TX status path only, no locking requirements */
  337. unsigned long tx_filtered_count;
  338. unsigned long tx_retry_failed, tx_retry_count;
  339. /* moving percentage of failed MSDUs */
  340. unsigned int fail_avg;
  341. /* Updated from TX path only, no locking requirements */
  342. u32 tx_fragments;
  343. u64 tx_packets[IEEE80211_NUM_ACS];
  344. u64 tx_bytes[IEEE80211_NUM_ACS];
  345. struct ieee80211_tx_rate last_tx_rate;
  346. int last_rx_rate_idx;
  347. u32 last_rx_rate_flag;
  348. u8 last_rx_rate_vht_nss;
  349. u16 tid_seq[IEEE80211_QOS_CTL_TID_MASK + 1];
  350. /*
  351. * Aggregation information, locked with lock.
  352. */
  353. struct sta_ampdu_mlme ampdu_mlme;
  354. u8 timer_to_tid[IEEE80211_NUM_TIDS];
  355. #ifdef CONFIG_MAC80211_MESH
  356. /*
  357. * Mesh peer link attributes
  358. * TODO: move to a sub-structure that is referenced with pointer?
  359. */
  360. __le16 llid;
  361. __le16 plid;
  362. __le16 reason;
  363. u8 plink_retries;
  364. bool ignore_plink_timer;
  365. enum nl80211_plink_state plink_state;
  366. u32 plink_timeout;
  367. struct timer_list plink_timer;
  368. s64 t_offset;
  369. s64 t_offset_setpoint;
  370. /* mesh power save */
  371. enum nl80211_mesh_power_mode local_pm;
  372. enum nl80211_mesh_power_mode peer_pm;
  373. enum nl80211_mesh_power_mode nonpeer_pm;
  374. #endif
  375. #ifdef CONFIG_MAC80211_DEBUGFS
  376. struct sta_info_debugfsdentries {
  377. struct dentry *dir;
  378. bool add_has_run;
  379. } debugfs;
  380. #endif
  381. enum ieee80211_sta_rx_bandwidth cur_max_bandwidth;
  382. unsigned int lost_packets;
  383. unsigned int beacon_loss_count;
  384. /* keep last! */
  385. struct ieee80211_sta sta;
  386. };
  387. static inline enum nl80211_plink_state sta_plink_state(struct sta_info *sta)
  388. {
  389. #ifdef CONFIG_MAC80211_MESH
  390. return sta->plink_state;
  391. #endif
  392. return NL80211_PLINK_LISTEN;
  393. }
  394. static inline void set_sta_flag(struct sta_info *sta,
  395. enum ieee80211_sta_info_flags flag)
  396. {
  397. WARN_ON(flag == WLAN_STA_AUTH ||
  398. flag == WLAN_STA_ASSOC ||
  399. flag == WLAN_STA_AUTHORIZED);
  400. set_bit(flag, &sta->_flags);
  401. }
  402. static inline void clear_sta_flag(struct sta_info *sta,
  403. enum ieee80211_sta_info_flags flag)
  404. {
  405. WARN_ON(flag == WLAN_STA_AUTH ||
  406. flag == WLAN_STA_ASSOC ||
  407. flag == WLAN_STA_AUTHORIZED);
  408. clear_bit(flag, &sta->_flags);
  409. }
  410. static inline int test_sta_flag(struct sta_info *sta,
  411. enum ieee80211_sta_info_flags flag)
  412. {
  413. return test_bit(flag, &sta->_flags);
  414. }
  415. static inline int test_and_clear_sta_flag(struct sta_info *sta,
  416. enum ieee80211_sta_info_flags flag)
  417. {
  418. WARN_ON(flag == WLAN_STA_AUTH ||
  419. flag == WLAN_STA_ASSOC ||
  420. flag == WLAN_STA_AUTHORIZED);
  421. return test_and_clear_bit(flag, &sta->_flags);
  422. }
  423. static inline int test_and_set_sta_flag(struct sta_info *sta,
  424. enum ieee80211_sta_info_flags flag)
  425. {
  426. WARN_ON(flag == WLAN_STA_AUTH ||
  427. flag == WLAN_STA_ASSOC ||
  428. flag == WLAN_STA_AUTHORIZED);
  429. return test_and_set_bit(flag, &sta->_flags);
  430. }
  431. int sta_info_move_state(struct sta_info *sta,
  432. enum ieee80211_sta_state new_state);
  433. static inline void sta_info_pre_move_state(struct sta_info *sta,
  434. enum ieee80211_sta_state new_state)
  435. {
  436. int ret;
  437. WARN_ON_ONCE(test_sta_flag(sta, WLAN_STA_INSERTED));
  438. ret = sta_info_move_state(sta, new_state);
  439. WARN_ON_ONCE(ret);
  440. }
  441. void ieee80211_assign_tid_tx(struct sta_info *sta, int tid,
  442. struct tid_ampdu_tx *tid_tx);
  443. static inline struct tid_ampdu_tx *
  444. rcu_dereference_protected_tid_tx(struct sta_info *sta, int tid)
  445. {
  446. return rcu_dereference_protected(sta->ampdu_mlme.tid_tx[tid],
  447. lockdep_is_held(&sta->lock) ||
  448. lockdep_is_held(&sta->ampdu_mlme.mtx));
  449. }
  450. #define STA_HASH_SIZE 256
  451. #define STA_HASH(sta) (sta[5])
  452. /* Maximum number of frames to buffer per power saving station per AC */
  453. #define STA_MAX_TX_BUFFER 64
  454. /* Minimum buffered frame expiry time. If STA uses listen interval that is
  455. * smaller than this value, the minimum value here is used instead. */
  456. #define STA_TX_BUFFER_EXPIRE (10 * HZ)
  457. /* How often station data is cleaned up (e.g., expiration of buffered frames)
  458. */
  459. #define STA_INFO_CLEANUP_INTERVAL (10 * HZ)
  460. /*
  461. * Get a STA info, must be under RCU read lock.
  462. */
  463. struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
  464. const u8 *addr);
  465. struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
  466. const u8 *addr);
  467. static inline
  468. void for_each_sta_info_type_check(struct ieee80211_local *local,
  469. const u8 *addr,
  470. struct sta_info *sta,
  471. struct sta_info *nxt)
  472. {
  473. }
  474. #define for_each_sta_info(local, _addr, _sta, nxt) \
  475. for ( /* initialise loop */ \
  476. _sta = rcu_dereference(local->sta_hash[STA_HASH(_addr)]),\
  477. nxt = _sta ? rcu_dereference(_sta->hnext) : NULL; \
  478. /* typecheck */ \
  479. for_each_sta_info_type_check(local, (_addr), _sta, nxt),\
  480. /* continue condition */ \
  481. _sta; \
  482. /* advance loop */ \
  483. _sta = nxt, \
  484. nxt = _sta ? rcu_dereference(_sta->hnext) : NULL \
  485. ) \
  486. /* compare address and run code only if it matches */ \
  487. if (ether_addr_equal(_sta->sta.addr, (_addr)))
  488. /*
  489. * Get STA info by index, BROKEN!
  490. */
  491. struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
  492. int idx);
  493. /*
  494. * Create a new STA info, caller owns returned structure
  495. * until sta_info_insert().
  496. */
  497. struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
  498. const u8 *addr, gfp_t gfp);
  499. void sta_info_free(struct ieee80211_local *local, struct sta_info *sta);
  500. /*
  501. * Insert STA info into hash table/list, returns zero or a
  502. * -EEXIST if (if the same MAC address is already present).
  503. *
  504. * Calling the non-rcu version makes the caller relinquish,
  505. * the _rcu version calls read_lock_rcu() and must be called
  506. * without it held.
  507. */
  508. int sta_info_insert(struct sta_info *sta);
  509. int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU);
  510. int __must_check __sta_info_destroy(struct sta_info *sta);
  511. int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata,
  512. const u8 *addr);
  513. int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
  514. const u8 *addr);
  515. void sta_info_recalc_tim(struct sta_info *sta);
  516. void sta_info_init(struct ieee80211_local *local);
  517. void sta_info_stop(struct ieee80211_local *local);
  518. int sta_info_flush_defer(struct ieee80211_sub_if_data *sdata);
  519. /**
  520. * sta_info_flush_cleanup - flush the sta_info cleanup queue
  521. * @sdata: the interface
  522. *
  523. * Flushes the sta_info cleanup queue for a given interface;
  524. * this is necessary before the interface is removed or, for
  525. * AP/mesh interfaces, before it is deconfigured.
  526. *
  527. * Note an rcu_barrier() must precede the function, after all
  528. * stations have been flushed/removed to ensure the call_rcu()
  529. * calls that add stations to the cleanup queue have completed.
  530. */
  531. void sta_info_flush_cleanup(struct ieee80211_sub_if_data *sdata);
  532. /**
  533. * sta_info_flush - flush matching STA entries from the STA table
  534. *
  535. * Returns the number of removed STA entries.
  536. *
  537. * @sdata: sdata to remove all stations from
  538. */
  539. static inline int sta_info_flush(struct ieee80211_sub_if_data *sdata)
  540. {
  541. int ret = sta_info_flush_defer(sdata);
  542. rcu_barrier();
  543. sta_info_flush_cleanup(sdata);
  544. return ret;
  545. }
  546. void sta_set_rate_info_tx(struct sta_info *sta,
  547. const struct ieee80211_tx_rate *rate,
  548. struct rate_info *rinfo);
  549. void sta_set_rate_info_rx(struct sta_info *sta,
  550. struct rate_info *rinfo);
  551. void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
  552. unsigned long exp_time);
  553. void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta);
  554. void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta);
  555. void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta);
  556. void ieee80211_cleanup_sdata_stas(struct ieee80211_sub_if_data *sdata);
  557. #endif /* STA_INFO_H */