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TOMOYO Linux Cross Reference
Linux/net/mac80211/sta_info.h

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  1 /*
  2  * Copyright 2002-2005, Devicescape Software, Inc.
  3  * Copyright 2013-2014  Intel Mobile Communications GmbH
  4  * Copyright(c) 2015-2017 Intel Deutschland GmbH
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License version 2 as
  8  * published by the Free Software Foundation.
  9  */
 10 
 11 #ifndef STA_INFO_H
 12 #define STA_INFO_H
 13 
 14 #include <linux/list.h>
 15 #include <linux/types.h>
 16 #include <linux/if_ether.h>
 17 #include <linux/workqueue.h>
 18 #include <linux/average.h>
 19 #include <linux/bitfield.h>
 20 #include <linux/etherdevice.h>
 21 #include <linux/rhashtable.h>
 22 #include <linux/u64_stats_sync.h>
 23 #include "key.h"
 24 
 25 /**
 26  * enum ieee80211_sta_info_flags - Stations flags
 27  *
 28  * These flags are used with &struct sta_info's @flags member, but
 29  * only indirectly with set_sta_flag() and friends.
 30  *
 31  * @WLAN_STA_AUTH: Station is authenticated.
 32  * @WLAN_STA_ASSOC: Station is associated.
 33  * @WLAN_STA_PS_STA: Station is in power-save mode
 34  * @WLAN_STA_AUTHORIZED: Station is authorized to send/receive traffic.
 35  *      This bit is always checked so needs to be enabled for all stations
 36  *      when virtual port control is not in use.
 37  * @WLAN_STA_SHORT_PREAMBLE: Station is capable of receiving short-preamble
 38  *      frames.
 39  * @WLAN_STA_WDS: Station is one of our WDS peers.
 40  * @WLAN_STA_CLEAR_PS_FILT: Clear PS filter in hardware (using the
 41  *      IEEE80211_TX_CTL_CLEAR_PS_FILT control flag) when the next
 42  *      frame to this station is transmitted.
 43  * @WLAN_STA_MFP: Management frame protection is used with this STA.
 44  * @WLAN_STA_BLOCK_BA: Used to deny ADDBA requests (both TX and RX)
 45  *      during suspend/resume and station removal.
 46  * @WLAN_STA_PS_DRIVER: driver requires keeping this station in
 47  *      power-save mode logically to flush frames that might still
 48  *      be in the queues
 49  * @WLAN_STA_PSPOLL: Station sent PS-poll while driver was keeping
 50  *      station in power-save mode, reply when the driver unblocks.
 51  * @WLAN_STA_TDLS_PEER: Station is a TDLS peer.
 52  * @WLAN_STA_TDLS_PEER_AUTH: This TDLS peer is authorized to send direct
 53  *      packets. This means the link is enabled.
 54  * @WLAN_STA_TDLS_INITIATOR: We are the initiator of the TDLS link with this
 55  *      station.
 56  * @WLAN_STA_TDLS_CHAN_SWITCH: This TDLS peer supports TDLS channel-switching
 57  * @WLAN_STA_TDLS_OFF_CHANNEL: The local STA is currently off-channel with this
 58  *      TDLS peer
 59  * @WLAN_STA_TDLS_WIDER_BW: This TDLS peer supports working on a wider bw on
 60  *      the BSS base channel.
 61  * @WLAN_STA_UAPSD: Station requested unscheduled SP while driver was
 62  *      keeping station in power-save mode, reply when the driver
 63  *      unblocks the station.
 64  * @WLAN_STA_SP: Station is in a service period, so don't try to
 65  *      reply to other uAPSD trigger frames or PS-Poll.
 66  * @WLAN_STA_4ADDR_EVENT: 4-addr event was already sent for this frame.
 67  * @WLAN_STA_INSERTED: This station is inserted into the hash table.
 68  * @WLAN_STA_RATE_CONTROL: rate control was initialized for this station.
 69  * @WLAN_STA_TOFFSET_KNOWN: toffset calculated for this station is valid.
 70  * @WLAN_STA_MPSP_OWNER: local STA is owner of a mesh Peer Service Period.
 71  * @WLAN_STA_MPSP_RECIPIENT: local STA is recipient of a MPSP.
 72  * @WLAN_STA_PS_DELIVER: station woke up, but we're still blocking TX
 73  *      until pending frames are delivered
 74  *
 75  * @NUM_WLAN_STA_FLAGS: number of defined flags
 76  */
 77 enum ieee80211_sta_info_flags {
 78         WLAN_STA_AUTH,
 79         WLAN_STA_ASSOC,
 80         WLAN_STA_PS_STA,
 81         WLAN_STA_AUTHORIZED,
 82         WLAN_STA_SHORT_PREAMBLE,
 83         WLAN_STA_WDS,
 84         WLAN_STA_CLEAR_PS_FILT,
 85         WLAN_STA_MFP,
 86         WLAN_STA_BLOCK_BA,
 87         WLAN_STA_PS_DRIVER,
 88         WLAN_STA_PSPOLL,
 89         WLAN_STA_TDLS_PEER,
 90         WLAN_STA_TDLS_PEER_AUTH,
 91         WLAN_STA_TDLS_INITIATOR,
 92         WLAN_STA_TDLS_CHAN_SWITCH,
 93         WLAN_STA_TDLS_OFF_CHANNEL,
 94         WLAN_STA_TDLS_WIDER_BW,
 95         WLAN_STA_UAPSD,
 96         WLAN_STA_SP,
 97         WLAN_STA_4ADDR_EVENT,
 98         WLAN_STA_INSERTED,
 99         WLAN_STA_RATE_CONTROL,
100         WLAN_STA_TOFFSET_KNOWN,
101         WLAN_STA_MPSP_OWNER,
102         WLAN_STA_MPSP_RECIPIENT,
103         WLAN_STA_PS_DELIVER,
104 
105         NUM_WLAN_STA_FLAGS,
106 };
107 
108 #define ADDBA_RESP_INTERVAL HZ
109 #define HT_AGG_MAX_RETRIES              15
110 #define HT_AGG_BURST_RETRIES            3
111 #define HT_AGG_RETRIES_PERIOD           (15 * HZ)
112 
113 #define HT_AGG_STATE_DRV_READY          0
114 #define HT_AGG_STATE_RESPONSE_RECEIVED  1
115 #define HT_AGG_STATE_OPERATIONAL        2
116 #define HT_AGG_STATE_STOPPING           3
117 #define HT_AGG_STATE_WANT_START         4
118 #define HT_AGG_STATE_WANT_STOP          5
119 #define HT_AGG_STATE_START_CB           6
120 #define HT_AGG_STATE_STOP_CB            7
121 
122 enum ieee80211_agg_stop_reason {
123         AGG_STOP_DECLINED,
124         AGG_STOP_LOCAL_REQUEST,
125         AGG_STOP_PEER_REQUEST,
126         AGG_STOP_DESTROY_STA,
127 };
128 
129 /**
130  * struct tid_ampdu_tx - TID aggregation information (Tx).
131  *
132  * @rcu_head: rcu head for freeing structure
133  * @session_timer: check if we keep Tx-ing on the TID (by timeout value)
134  * @addba_resp_timer: timer for peer's response to addba request
135  * @pending: pending frames queue -- use sta's spinlock to protect
136  * @dialog_token: dialog token for aggregation session
137  * @timeout: session timeout value to be filled in ADDBA requests
138  * @state: session state (see above)
139  * @last_tx: jiffies of last tx activity
140  * @stop_initiator: initiator of a session stop
141  * @tx_stop: TX DelBA frame when stopping
142  * @buf_size: reorder buffer size at receiver
143  * @failed_bar_ssn: ssn of the last failed BAR tx attempt
144  * @bar_pending: BAR needs to be re-sent
145  * @amsdu: support A-MSDU withing A-MDPU
146  *
147  * This structure's lifetime is managed by RCU, assignments to
148  * the array holding it must hold the aggregation mutex.
149  *
150  * The TX path can access it under RCU lock-free if, and
151  * only if, the state has the flag %HT_AGG_STATE_OPERATIONAL
152  * set. Otherwise, the TX path must also acquire the spinlock
153  * and re-check the state, see comments in the tx code
154  * touching it.
155  */
156 struct tid_ampdu_tx {
157         struct rcu_head rcu_head;
158         struct timer_list session_timer;
159         struct timer_list addba_resp_timer;
160         struct sk_buff_head pending;
161         unsigned long state;
162         unsigned long last_tx;
163         u16 timeout;
164         u8 dialog_token;
165         u8 stop_initiator;
166         bool tx_stop;
167         u8 buf_size;
168 
169         u16 failed_bar_ssn;
170         bool bar_pending;
171         bool amsdu;
172 };
173 
174 /**
175  * struct tid_ampdu_rx - TID aggregation information (Rx).
176  *
177  * @reorder_buf: buffer to reorder incoming aggregated MPDUs. An MPDU may be an
178  *      A-MSDU with individually reported subframes.
179  * @reorder_buf_filtered: bitmap indicating where there are filtered frames in
180  *      the reorder buffer that should be ignored when releasing frames
181  * @reorder_time: jiffies when skb was added
182  * @session_timer: check if peer keeps Tx-ing on the TID (by timeout value)
183  * @reorder_timer: releases expired frames from the reorder buffer.
184  * @last_rx: jiffies of last rx activity
185  * @head_seq_num: head sequence number in reordering buffer.
186  * @stored_mpdu_num: number of MPDUs in reordering buffer
187  * @ssn: Starting Sequence Number expected to be aggregated.
188  * @buf_size: buffer size for incoming A-MPDUs
189  * @timeout: reset timer value (in TUs).
190  * @rcu_head: RCU head used for freeing this struct
191  * @reorder_lock: serializes access to reorder buffer, see below.
192  * @auto_seq: used for offloaded BA sessions to automatically pick head_seq_and
193  *      and ssn.
194  * @removed: this session is removed (but might have been found due to RCU)
195  * @started: this session has started (head ssn or higher was received)
196  *
197  * This structure's lifetime is managed by RCU, assignments to
198  * the array holding it must hold the aggregation mutex.
199  *
200  * The @reorder_lock is used to protect the members of this
201  * struct, except for @timeout, @buf_size and @dialog_token,
202  * which are constant across the lifetime of the struct (the
203  * dialog token being used only for debugging).
204  */
205 struct tid_ampdu_rx {
206         struct rcu_head rcu_head;
207         spinlock_t reorder_lock;
208         u64 reorder_buf_filtered;
209         struct sk_buff_head *reorder_buf;
210         unsigned long *reorder_time;
211         struct timer_list session_timer;
212         struct timer_list reorder_timer;
213         unsigned long last_rx;
214         u16 head_seq_num;
215         u16 stored_mpdu_num;
216         u16 ssn;
217         u16 buf_size;
218         u16 timeout;
219         u8 auto_seq:1,
220            removed:1,
221            started:1;
222 };
223 
224 /**
225  * struct sta_ampdu_mlme - STA aggregation information.
226  *
227  * @mtx: mutex to protect all TX data (except non-NULL assignments
228  *      to tid_tx[idx], which are protected by the sta spinlock)
229  *      tid_start_tx is also protected by sta->lock.
230  * @tid_rx: aggregation info for Rx per TID -- RCU protected
231  * @tid_rx_token: dialog tokens for valid aggregation sessions
232  * @tid_rx_timer_expired: bitmap indicating on which TIDs the
233  *      RX timer expired until the work for it runs
234  * @tid_rx_stop_requested:  bitmap indicating which BA sessions per TID the
235  *      driver requested to close until the work for it runs
236  * @tid_rx_manage_offl: bitmap indicating which BA sessions were requested
237  *      to be treated as started/stopped due to offloading
238  * @agg_session_valid: bitmap indicating which TID has a rx BA session open on
239  * @unexpected_agg: bitmap indicating which TID already sent a delBA due to
240  *      unexpected aggregation related frames outside a session
241  * @work: work struct for starting/stopping aggregation
242  * @tid_tx: aggregation info for Tx per TID
243  * @tid_start_tx: sessions where start was requested
244  * @last_addba_req_time: timestamp of the last addBA request.
245  * @addba_req_num: number of times addBA request has been sent.
246  * @dialog_token_allocator: dialog token enumerator for each new session;
247  */
248 struct sta_ampdu_mlme {
249         struct mutex mtx;
250         /* rx */
251         struct tid_ampdu_rx __rcu *tid_rx[IEEE80211_NUM_TIDS];
252         u8 tid_rx_token[IEEE80211_NUM_TIDS];
253         unsigned long tid_rx_timer_expired[BITS_TO_LONGS(IEEE80211_NUM_TIDS)];
254         unsigned long tid_rx_stop_requested[BITS_TO_LONGS(IEEE80211_NUM_TIDS)];
255         unsigned long tid_rx_manage_offl[BITS_TO_LONGS(2 * IEEE80211_NUM_TIDS)];
256         unsigned long agg_session_valid[BITS_TO_LONGS(IEEE80211_NUM_TIDS)];
257         unsigned long unexpected_agg[BITS_TO_LONGS(IEEE80211_NUM_TIDS)];
258         /* tx */
259         struct work_struct work;
260         struct tid_ampdu_tx __rcu *tid_tx[IEEE80211_NUM_TIDS];
261         struct tid_ampdu_tx *tid_start_tx[IEEE80211_NUM_TIDS];
262         unsigned long last_addba_req_time[IEEE80211_NUM_TIDS];
263         u8 addba_req_num[IEEE80211_NUM_TIDS];
264         u8 dialog_token_allocator;
265 };
266 
267 
268 /* Value to indicate no TID reservation */
269 #define IEEE80211_TID_UNRESERVED        0xff
270 
271 #define IEEE80211_FAST_XMIT_MAX_IV      18
272 
273 /**
274  * struct ieee80211_fast_tx - TX fastpath information
275  * @key: key to use for hw crypto
276  * @hdr: the 802.11 header to put with the frame
277  * @hdr_len: actual 802.11 header length
278  * @sa_offs: offset of the SA
279  * @da_offs: offset of the DA
280  * @pn_offs: offset where to put PN for crypto (or 0 if not needed)
281  * @band: band this will be transmitted on, for tx_info
282  * @rcu_head: RCU head to free this struct
283  *
284  * This struct is small enough so that the common case (maximum crypto
285  * header length of 8 like for CCMP/GCMP) fits into a single 64-byte
286  * cache line.
287  */
288 struct ieee80211_fast_tx {
289         struct ieee80211_key *key;
290         u8 hdr_len;
291         u8 sa_offs, da_offs, pn_offs;
292         u8 band;
293         u8 hdr[30 + 2 + IEEE80211_FAST_XMIT_MAX_IV +
294                sizeof(rfc1042_header)] __aligned(2);
295 
296         struct rcu_head rcu_head;
297 };
298 
299 /**
300  * struct ieee80211_fast_rx - RX fastpath information
301  * @dev: netdevice for reporting the SKB
302  * @vif_type: (P2P-less) interface type of the original sdata (sdata->vif.type)
303  * @vif_addr: interface address
304  * @rfc1042_hdr: copy of the RFC 1042 SNAP header (to have in cache)
305  * @control_port_protocol: control port protocol copied from sdata
306  * @expected_ds_bits: from/to DS bits expected
307  * @icv_len: length of the MIC if present
308  * @key: bool indicating encryption is expected (key is set)
309  * @sta_notify: notify the MLME code (once)
310  * @internal_forward: forward froms internally on AP/VLAN type interfaces
311  * @uses_rss: copy of USES_RSS hw flag
312  * @da_offs: offset of the DA in the header (for header conversion)
313  * @sa_offs: offset of the SA in the header (for header conversion)
314  * @rcu_head: RCU head for freeing this structure
315  */
316 struct ieee80211_fast_rx {
317         struct net_device *dev;
318         enum nl80211_iftype vif_type;
319         u8 vif_addr[ETH_ALEN] __aligned(2);
320         u8 rfc1042_hdr[6] __aligned(2);
321         __be16 control_port_protocol;
322         __le16 expected_ds_bits;
323         u8 icv_len;
324         u8 key:1,
325            sta_notify:1,
326            internal_forward:1,
327            uses_rss:1;
328         u8 da_offs, sa_offs;
329 
330         struct rcu_head rcu_head;
331 };
332 
333 /* we use only values in the range 0-100, so pick a large precision */
334 DECLARE_EWMA(mesh_fail_avg, 20, 8)
335 
336 /**
337  * struct mesh_sta - mesh STA information
338  * @plink_lock: serialize access to plink fields
339  * @llid: Local link ID
340  * @plid: Peer link ID
341  * @aid: local aid supplied by peer
342  * @reason: Cancel reason on PLINK_HOLDING state
343  * @plink_retries: Retries in establishment
344  * @plink_state: peer link state
345  * @plink_timeout: timeout of peer link
346  * @plink_timer: peer link watch timer
347  * @t_offset: timing offset relative to this host
348  * @t_offset_setpoint: reference timing offset of this sta to be used when
349  *      calculating clockdrift
350  * @local_pm: local link-specific power save mode
351  * @peer_pm: peer-specific power save mode towards local STA
352  * @nonpeer_pm: STA power save mode towards non-peer neighbors
353  * @processed_beacon: set to true after peer rates and capabilities are
354  *      processed
355  * @fail_avg: moving percentage of failed MSDUs
356  */
357 struct mesh_sta {
358         struct timer_list plink_timer;
359 
360         s64 t_offset;
361         s64 t_offset_setpoint;
362 
363         spinlock_t plink_lock;
364         u16 llid;
365         u16 plid;
366         u16 aid;
367         u16 reason;
368         u8 plink_retries;
369 
370         bool processed_beacon;
371 
372         enum nl80211_plink_state plink_state;
373         u32 plink_timeout;
374 
375         /* mesh power save */
376         enum nl80211_mesh_power_mode local_pm;
377         enum nl80211_mesh_power_mode peer_pm;
378         enum nl80211_mesh_power_mode nonpeer_pm;
379 
380         /* moving percentage of failed MSDUs */
381         struct ewma_mesh_fail_avg fail_avg;
382 };
383 
384 DECLARE_EWMA(signal, 10, 8)
385 
386 struct ieee80211_sta_rx_stats {
387         unsigned long packets;
388         unsigned long last_rx;
389         unsigned long num_duplicates;
390         unsigned long fragments;
391         unsigned long dropped;
392         int last_signal;
393         u8 chains;
394         s8 chain_signal_last[IEEE80211_MAX_CHAINS];
395         u16 last_rate;
396         struct u64_stats_sync syncp;
397         u64 bytes;
398         u64 msdu[IEEE80211_NUM_TIDS + 1];
399 };
400 
401 /**
402  * The bandwidth threshold below which the per-station CoDel parameters will be
403  * scaled to be more lenient (to prevent starvation of slow stations). This
404  * value will be scaled by the number of active stations when it is being
405  * applied.
406  */
407 #define STA_SLOW_THRESHOLD 6000 /* 6 Mbps */
408 
409 /**
410  * struct sta_info - STA information
411  *
412  * This structure collects information about a station that
413  * mac80211 is communicating with.
414  *
415  * @list: global linked list entry
416  * @free_list: list entry for keeping track of stations to free
417  * @hash_node: hash node for rhashtable
418  * @addr: station's MAC address - duplicated from public part to
419  *      let the hash table work with just a single cacheline
420  * @local: pointer to the global information
421  * @sdata: virtual interface this station belongs to
422  * @ptk: peer keys negotiated with this station, if any
423  * @ptk_idx: last installed peer key index
424  * @gtk: group keys negotiated with this station, if any
425  * @rate_ctrl: rate control algorithm reference
426  * @rate_ctrl_lock: spinlock used to protect rate control data
427  *      (data inside the algorithm, so serializes calls there)
428  * @rate_ctrl_priv: rate control private per-STA pointer
429  * @lock: used for locking all fields that require locking, see comments
430  *      in the header file.
431  * @drv_deliver_wk: used for delivering frames after driver PS unblocking
432  * @listen_interval: listen interval of this station, when we're acting as AP
433  * @_flags: STA flags, see &enum ieee80211_sta_info_flags, do not use directly
434  * @ps_lock: used for powersave (when mac80211 is the AP) related locking
435  * @ps_tx_buf: buffers (per AC) of frames to transmit to this station
436  *      when it leaves power saving state or polls
437  * @tx_filtered: buffers (per AC) of frames we already tried to
438  *      transmit but were filtered by hardware due to STA having
439  *      entered power saving state, these are also delivered to
440  *      the station when it leaves powersave or polls for frames
441  * @driver_buffered_tids: bitmap of TIDs the driver has data buffered on
442  * @txq_buffered_tids: bitmap of TIDs that mac80211 has txq data buffered on
443  * @last_connected: time (in seconds) when a station got connected
444  * @last_seq_ctrl: last received seq/frag number from this STA (per TID
445  *      plus one for non-QoS frames)
446  * @tid_seq: per-TID sequence numbers for sending to this STA
447  * @ampdu_mlme: A-MPDU state machine state
448  * @timer_to_tid: identity mapping to ID timers
449  * @mesh: mesh STA information
450  * @debugfs_dir: debug filesystem directory dentry
451  * @dead: set to true when sta is unlinked
452  * @removed: set to true when sta is being removed from sta_list
453  * @uploaded: set to true when sta is uploaded to the driver
454  * @sta: station information we share with the driver
455  * @sta_state: duplicates information about station state (for debug)
456  * @rcu_head: RCU head used for freeing this station struct
457  * @cur_max_bandwidth: maximum bandwidth to use for TX to the station,
458  *      taken from HT/VHT capabilities or VHT operating mode notification
459  * @known_smps_mode: the smps_mode the client thinks we are in. Relevant for
460  *      AP only.
461  * @cipher_scheme: optional cipher scheme for this station
462  * @cparams: CoDel parameters for this station.
463  * @reserved_tid: reserved TID (if any, otherwise IEEE80211_TID_UNRESERVED)
464  * @fast_tx: TX fastpath information
465  * @fast_rx: RX fastpath information
466  * @tdls_chandef: a TDLS peer can have a wider chandef that is compatible to
467  *      the BSS one.
468  * @tx_stats: TX statistics
469  * @rx_stats: RX statistics
470  * @pcpu_rx_stats: per-CPU RX statistics, assigned only if the driver needs
471  *      this (by advertising the USES_RSS hw flag)
472  * @status_stats: TX status statistics
473  */
474 struct sta_info {
475         /* General information, mostly static */
476         struct list_head list, free_list;
477         struct rcu_head rcu_head;
478         struct rhlist_head hash_node;
479         u8 addr[ETH_ALEN];
480         struct ieee80211_local *local;
481         struct ieee80211_sub_if_data *sdata;
482         struct ieee80211_key __rcu *gtk[NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS];
483         struct ieee80211_key __rcu *ptk[NUM_DEFAULT_KEYS];
484         u8 ptk_idx;
485         struct rate_control_ref *rate_ctrl;
486         void *rate_ctrl_priv;
487         spinlock_t rate_ctrl_lock;
488         spinlock_t lock;
489 
490         struct ieee80211_fast_tx __rcu *fast_tx;
491         struct ieee80211_fast_rx __rcu *fast_rx;
492         struct ieee80211_sta_rx_stats __percpu *pcpu_rx_stats;
493 
494 #ifdef CONFIG_MAC80211_MESH
495         struct mesh_sta *mesh;
496 #endif
497 
498         struct work_struct drv_deliver_wk;
499 
500         u16 listen_interval;
501 
502         bool dead;
503         bool removed;
504 
505         bool uploaded;
506 
507         enum ieee80211_sta_state sta_state;
508 
509         /* use the accessors defined below */
510         unsigned long _flags;
511 
512         /* STA powersave lock and frame queues */
513         spinlock_t ps_lock;
514         struct sk_buff_head ps_tx_buf[IEEE80211_NUM_ACS];
515         struct sk_buff_head tx_filtered[IEEE80211_NUM_ACS];
516         unsigned long driver_buffered_tids;
517         unsigned long txq_buffered_tids;
518 
519         long last_connected;
520 
521         /* Updated from RX path only, no locking requirements */
522         struct ieee80211_sta_rx_stats rx_stats;
523         struct {
524                 struct ewma_signal signal;
525                 struct ewma_signal chain_signal[IEEE80211_MAX_CHAINS];
526         } rx_stats_avg;
527 
528         /* Plus 1 for non-QoS frames */
529         __le16 last_seq_ctrl[IEEE80211_NUM_TIDS + 1];
530 
531         /* Updated from TX status path only, no locking requirements */
532         struct {
533                 unsigned long filtered;
534                 unsigned long retry_failed, retry_count;
535                 unsigned int lost_packets;
536                 unsigned long last_tdls_pkt_time;
537                 u64 msdu_retries[IEEE80211_NUM_TIDS + 1];
538                 u64 msdu_failed[IEEE80211_NUM_TIDS + 1];
539                 unsigned long last_ack;
540         } status_stats;
541 
542         /* Updated from TX path only, no locking requirements */
543         struct {
544                 u64 packets[IEEE80211_NUM_ACS];
545                 u64 bytes[IEEE80211_NUM_ACS];
546                 struct ieee80211_tx_rate last_rate;
547                 u64 msdu[IEEE80211_NUM_TIDS + 1];
548         } tx_stats;
549         u16 tid_seq[IEEE80211_QOS_CTL_TID_MASK + 1];
550 
551         /*
552          * Aggregation information, locked with lock.
553          */
554         struct sta_ampdu_mlme ampdu_mlme;
555         u8 timer_to_tid[IEEE80211_NUM_TIDS];
556 
557 #ifdef CONFIG_MAC80211_DEBUGFS
558         struct dentry *debugfs_dir;
559 #endif
560 
561         enum ieee80211_sta_rx_bandwidth cur_max_bandwidth;
562 
563         enum ieee80211_smps_mode known_smps_mode;
564         const struct ieee80211_cipher_scheme *cipher_scheme;
565 
566         struct codel_params cparams;
567 
568         u8 reserved_tid;
569 
570         struct cfg80211_chan_def tdls_chandef;
571 
572         /* keep last! */
573         struct ieee80211_sta sta;
574 };
575 
576 static inline enum nl80211_plink_state sta_plink_state(struct sta_info *sta)
577 {
578 #ifdef CONFIG_MAC80211_MESH
579         return sta->mesh->plink_state;
580 #endif
581         return NL80211_PLINK_LISTEN;
582 }
583 
584 static inline void set_sta_flag(struct sta_info *sta,
585                                 enum ieee80211_sta_info_flags flag)
586 {
587         WARN_ON(flag == WLAN_STA_AUTH ||
588                 flag == WLAN_STA_ASSOC ||
589                 flag == WLAN_STA_AUTHORIZED);
590         set_bit(flag, &sta->_flags);
591 }
592 
593 static inline void clear_sta_flag(struct sta_info *sta,
594                                   enum ieee80211_sta_info_flags flag)
595 {
596         WARN_ON(flag == WLAN_STA_AUTH ||
597                 flag == WLAN_STA_ASSOC ||
598                 flag == WLAN_STA_AUTHORIZED);
599         clear_bit(flag, &sta->_flags);
600 }
601 
602 static inline int test_sta_flag(struct sta_info *sta,
603                                 enum ieee80211_sta_info_flags flag)
604 {
605         return test_bit(flag, &sta->_flags);
606 }
607 
608 static inline int test_and_clear_sta_flag(struct sta_info *sta,
609                                           enum ieee80211_sta_info_flags flag)
610 {
611         WARN_ON(flag == WLAN_STA_AUTH ||
612                 flag == WLAN_STA_ASSOC ||
613                 flag == WLAN_STA_AUTHORIZED);
614         return test_and_clear_bit(flag, &sta->_flags);
615 }
616 
617 static inline int test_and_set_sta_flag(struct sta_info *sta,
618                                         enum ieee80211_sta_info_flags flag)
619 {
620         WARN_ON(flag == WLAN_STA_AUTH ||
621                 flag == WLAN_STA_ASSOC ||
622                 flag == WLAN_STA_AUTHORIZED);
623         return test_and_set_bit(flag, &sta->_flags);
624 }
625 
626 int sta_info_move_state(struct sta_info *sta,
627                         enum ieee80211_sta_state new_state);
628 
629 static inline void sta_info_pre_move_state(struct sta_info *sta,
630                                            enum ieee80211_sta_state new_state)
631 {
632         int ret;
633 
634         WARN_ON_ONCE(test_sta_flag(sta, WLAN_STA_INSERTED));
635 
636         ret = sta_info_move_state(sta, new_state);
637         WARN_ON_ONCE(ret);
638 }
639 
640 
641 void ieee80211_assign_tid_tx(struct sta_info *sta, int tid,
642                              struct tid_ampdu_tx *tid_tx);
643 
644 static inline struct tid_ampdu_tx *
645 rcu_dereference_protected_tid_tx(struct sta_info *sta, int tid)
646 {
647         return rcu_dereference_protected(sta->ampdu_mlme.tid_tx[tid],
648                                          lockdep_is_held(&sta->lock) ||
649                                          lockdep_is_held(&sta->ampdu_mlme.mtx));
650 }
651 
652 /* Maximum number of frames to buffer per power saving station per AC */
653 #define STA_MAX_TX_BUFFER       64
654 
655 /* Minimum buffered frame expiry time. If STA uses listen interval that is
656  * smaller than this value, the minimum value here is used instead. */
657 #define STA_TX_BUFFER_EXPIRE (10 * HZ)
658 
659 /* How often station data is cleaned up (e.g., expiration of buffered frames)
660  */
661 #define STA_INFO_CLEANUP_INTERVAL (10 * HZ)
662 
663 struct rhlist_head *sta_info_hash_lookup(struct ieee80211_local *local,
664                                          const u8 *addr);
665 
666 /*
667  * Get a STA info, must be under RCU read lock.
668  */
669 struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
670                               const u8 *addr);
671 
672 struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
673                                   const u8 *addr);
674 
675 #define for_each_sta_info(local, _addr, _sta, _tmp)                     \
676         rhl_for_each_entry_rcu(_sta, _tmp,                              \
677                                sta_info_hash_lookup(local, _addr), hash_node)
678 
679 /*
680  * Get STA info by index, BROKEN!
681  */
682 struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
683                                      int idx);
684 /*
685  * Create a new STA info, caller owns returned structure
686  * until sta_info_insert().
687  */
688 struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
689                                 const u8 *addr, gfp_t gfp);
690 
691 void sta_info_free(struct ieee80211_local *local, struct sta_info *sta);
692 
693 /*
694  * Insert STA info into hash table/list, returns zero or a
695  * -EEXIST if (if the same MAC address is already present).
696  *
697  * Calling the non-rcu version makes the caller relinquish,
698  * the _rcu version calls read_lock_rcu() and must be called
699  * without it held.
700  */
701 int sta_info_insert(struct sta_info *sta);
702 int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU);
703 
704 int __must_check __sta_info_destroy(struct sta_info *sta);
705 int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata,
706                           const u8 *addr);
707 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
708                               const u8 *addr);
709 
710 void sta_info_recalc_tim(struct sta_info *sta);
711 
712 int sta_info_init(struct ieee80211_local *local);
713 void sta_info_stop(struct ieee80211_local *local);
714 
715 /**
716  * sta_info_flush - flush matching STA entries from the STA table
717  *
718  * Returns the number of removed STA entries.
719  *
720  * @sdata: sdata to remove all stations from
721  * @vlans: if the given interface is an AP interface, also flush VLANs
722  */
723 int __sta_info_flush(struct ieee80211_sub_if_data *sdata, bool vlans);
724 
725 static inline int sta_info_flush(struct ieee80211_sub_if_data *sdata)
726 {
727         return __sta_info_flush(sdata, false);
728 }
729 
730 void sta_set_rate_info_tx(struct sta_info *sta,
731                           const struct ieee80211_tx_rate *rate,
732                           struct rate_info *rinfo);
733 void sta_set_sinfo(struct sta_info *sta, struct station_info *sinfo);
734 
735 u32 sta_get_expected_throughput(struct sta_info *sta);
736 
737 void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
738                           unsigned long exp_time);
739 u8 sta_info_tx_streams(struct sta_info *sta);
740 
741 void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta);
742 void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta);
743 void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta);
744 
745 unsigned long ieee80211_sta_last_active(struct sta_info *sta);
746 
747 enum sta_stats_type {
748         STA_STATS_RATE_TYPE_INVALID = 0,
749         STA_STATS_RATE_TYPE_LEGACY,
750         STA_STATS_RATE_TYPE_HT,
751         STA_STATS_RATE_TYPE_VHT,
752 };
753 
754 #define STA_STATS_FIELD_HT_MCS          GENMASK( 7,  0)
755 #define STA_STATS_FIELD_LEGACY_IDX      GENMASK( 3,  0)
756 #define STA_STATS_FIELD_LEGACY_BAND     GENMASK( 7,  4)
757 #define STA_STATS_FIELD_VHT_MCS         GENMASK( 3,  0)
758 #define STA_STATS_FIELD_VHT_NSS         GENMASK( 7,  4)
759 #define STA_STATS_FIELD_BW              GENMASK(11,  8)
760 #define STA_STATS_FIELD_SGI             GENMASK(12, 12)
761 #define STA_STATS_FIELD_TYPE            GENMASK(15, 13)
762 
763 #define STA_STATS_FIELD(_n, _v)         FIELD_PREP(STA_STATS_FIELD_ ## _n, _v)
764 #define STA_STATS_GET(_n, _v)           FIELD_GET(STA_STATS_FIELD_ ## _n, _v)
765 
766 #define STA_STATS_RATE_INVALID          0
767 
768 static inline u32 sta_stats_encode_rate(struct ieee80211_rx_status *s)
769 {
770         u16 r;
771 
772         r = STA_STATS_FIELD(BW, s->bw);
773 
774         if (s->enc_flags & RX_ENC_FLAG_SHORT_GI)
775                 r |= STA_STATS_FIELD(SGI, 1);
776 
777         switch (s->encoding) {
778         case RX_ENC_VHT:
779                 r |= STA_STATS_FIELD(TYPE, STA_STATS_RATE_TYPE_VHT);
780                 r |= STA_STATS_FIELD(VHT_NSS, s->nss);
781                 r |= STA_STATS_FIELD(VHT_MCS, s->rate_idx);
782                 break;
783         case RX_ENC_HT:
784                 r |= STA_STATS_FIELD(TYPE, STA_STATS_RATE_TYPE_HT);
785                 r |= STA_STATS_FIELD(HT_MCS, s->rate_idx);
786                 break;
787         case RX_ENC_LEGACY:
788                 r |= STA_STATS_FIELD(TYPE, STA_STATS_RATE_TYPE_LEGACY);
789                 r |= STA_STATS_FIELD(LEGACY_BAND, s->band);
790                 r |= STA_STATS_FIELD(LEGACY_IDX, s->rate_idx);
791                 break;
792         default:
793                 WARN_ON(1);
794                 return STA_STATS_RATE_INVALID;
795         }
796 
797         return r;
798 }
799 
800 #endif /* STA_INFO_H */
801 

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