net/mac80211/sta_info.h

   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 DECLARE_EWMA(avg_signal, 10, 8)
 123 enum ieee80211_agg_stop_reason {
 124         AGG_STOP_DECLINED,
 125         AGG_STOP_LOCAL_REQUEST,
 126         AGG_STOP_PEER_REQUEST,
 127         AGG_STOP_DESTROY_STA,
 128 };
 129
 130 /* Debugfs flags to enable/disable use of RX/TX airtime in scheduler */
 131 #define AIRTIME_USE_TX          BIT(0)
 132 #define AIRTIME_USE_RX          BIT(1)
 133
 134 struct airtime_info {
 135         u64 rx_airtime;
 136         u64 tx_airtime;
 137         s64 deficit;
 138 };
 139
 140 struct sta_info;
 141
 142 /**
 143  * struct tid_ampdu_tx - TID aggregation information (Tx).
 144  *
 145  * @rcu_head: rcu head for freeing structure
 146  * @session_timer: check if we keep Tx-ing on the TID (by timeout value)
 147  * @addba_resp_timer: timer for peer's response to addba request
 148  * @pending: pending frames queue -- use sta's spinlock to protect
 149  * @sta: station we are attached to
 150  * @dialog_token: dialog token for aggregation session
 151  * @timeout: session timeout value to be filled in ADDBA requests
 152  * @tid: TID number
 153  * @state: session state (see above)
 154  * @last_tx: jiffies of last tx activity
 155  * @stop_initiator: initiator of a session stop
 156  * @tx_stop: TX DelBA frame when stopping
 157  * @buf_size: reorder buffer size at receiver
 158  * @failed_bar_ssn: ssn of the last failed BAR tx attempt
 159  * @bar_pending: BAR needs to be re-sent
 160  * @amsdu: support A-MSDU withing A-MDPU
 161  *
 162  * This structure's lifetime is managed by RCU, assignments to
 163  * the array holding it must hold the aggregation mutex.
 164  *
 165  * The TX path can access it under RCU lock-free if, and
 166  * only if, the state has the flag %HT_AGG_STATE_OPERATIONAL
 167  * set. Otherwise, the TX path must also acquire the spinlock
 168  * and re-check the state, see comments in the tx code
 169  * touching it.
 170  */
 171 struct tid_ampdu_tx {
 172         struct rcu_head rcu_head;
 173         struct timer_list session_timer;
 174         struct timer_list addba_resp_timer;
 175         struct sk_buff_head pending;
 176         struct sta_info *sta;
 177         unsigned long state;
 178         unsigned long last_tx;
 179         u16 timeout;
 180         u8 dialog_token;
 181         u8 stop_initiator;
 182         bool tx_stop;
 183         u16 buf_size;
 184
 185         u16 failed_bar_ssn;
 186         bool bar_pending;
 187         bool amsdu;
 188         u8 tid;
 189 };
 190
 191 /**
 192  * struct tid_ampdu_rx - TID aggregation information (Rx).
 193  *
 194  * @reorder_buf: buffer to reorder incoming aggregated MPDUs. An MPDU may be an
 195  *      A-MSDU with individually reported subframes.
 196  * @reorder_buf_filtered: bitmap indicating where there are filtered frames in
 197  *      the reorder buffer that should be ignored when releasing frames
 198  * @reorder_time: jiffies when skb was added
 199  * @session_timer: check if peer keeps Tx-ing on the TID (by timeout value)
 200  * @reorder_timer: releases expired frames from the reorder buffer.
 201  * @sta: station we are attached to
 202  * @last_rx: jiffies of last rx activity
 203  * @head_seq_num: head sequence number in reordering buffer.
 204  * @stored_mpdu_num: number of MPDUs in reordering buffer
 205  * @ssn: Starting Sequence Number expected to be aggregated.
 206  * @buf_size: buffer size for incoming A-MPDUs
 207  * @timeout: reset timer value (in TUs).
 208  * @tid: TID number
 209  * @rcu_head: RCU head used for freeing this struct
 210  * @reorder_lock: serializes access to reorder buffer, see below.
 211  * @auto_seq: used for offloaded BA sessions to automatically pick head_seq_and
 212  *      and ssn.
 213  * @removed: this session is removed (but might have been found due to RCU)
 214  * @started: this session has started (head ssn or higher was received)
 215  *
 216  * This structure's lifetime is managed by RCU, assignments to
 217  * the array holding it must hold the aggregation mutex.
 218  *
 219  * The @reorder_lock is used to protect the members of this
 220  * struct, except for @timeout, @buf_size and @dialog_token,
 221  * which are constant across the lifetime of the struct (the
 222  * dialog token being used only for debugging).
 223  */
 224 struct tid_ampdu_rx {
 225         struct rcu_head rcu_head;
 226         spinlock_t reorder_lock;
 227         u64 reorder_buf_filtered;
 228         struct sk_buff_head *reorder_buf;
 229         unsigned long *reorder_time;
 230         struct sta_info *sta;
 231         struct timer_list session_timer;
 232         struct timer_list reorder_timer;
 233         unsigned long last_rx;
 234         u16 head_seq_num;
 235         u16 stored_mpdu_num;
 236         u16 ssn;
 237         u16 buf_size;
 238         u16 timeout;
 239         u8 tid;
 240         u8 auto_seq:1,
 241            removed:1,
 242            started:1;
 243 };
 244
 245 /**
 246  * struct sta_ampdu_mlme - STA aggregation information.
 247  *
 248  * @mtx: mutex to protect all TX data (except non-NULL assignments
 249  *      to tid_tx[idx], which are protected by the sta spinlock)
 250  *      tid_start_tx is also protected by sta->lock.
 251  * @tid_rx: aggregation info for Rx per TID -- RCU protected
 252  * @tid_rx_token: dialog tokens for valid aggregation sessions
 253  * @tid_rx_timer_expired: bitmap indicating on which TIDs the
 254  *      RX timer expired until the work for it runs
 255  * @tid_rx_stop_requested:  bitmap indicating which BA sessions per TID the
 256  *      driver requested to close until the work for it runs
 257  * @tid_rx_manage_offl: bitmap indicating which BA sessions were requested
 258  *      to be treated as started/stopped due to offloading
 259  * @agg_session_valid: bitmap indicating which TID has a rx BA session open on
 260  * @unexpected_agg: bitmap indicating which TID already sent a delBA due to
 261  *      unexpected aggregation related frames outside a session
 262  * @work: work struct for starting/stopping aggregation
 263  * @tid_tx: aggregation info for Tx per TID
 264  * @tid_start_tx: sessions where start was requested
 265  * @last_addba_req_time: timestamp of the last addBA request.
 266  * @addba_req_num: number of times addBA request has been sent.
 267  * @dialog_token_allocator: dialog token enumerator for each new session;
 268  */
 269 struct sta_ampdu_mlme {
 270         struct mutex mtx;
 271         /* rx */
 272         struct tid_ampdu_rx __rcu *tid_rx[IEEE80211_NUM_TIDS];
 273         u8 tid_rx_token[IEEE80211_NUM_TIDS];
 274         unsigned long tid_rx_timer_expired[BITS_TO_LONGS(IEEE80211_NUM_TIDS)];
 275         unsigned long tid_rx_stop_requested[BITS_TO_LONGS(IEEE80211_NUM_TIDS)];
 276         unsigned long tid_rx_manage_offl[BITS_TO_LONGS(2 * IEEE80211_NUM_TIDS)];
 277         unsigned long agg_session_valid[BITS_TO_LONGS(IEEE80211_NUM_TIDS)];
 278         unsigned long unexpected_agg[BITS_TO_LONGS(IEEE80211_NUM_TIDS)];
 279         /* tx */
 280         struct work_struct work;
 281         struct tid_ampdu_tx __rcu *tid_tx[IEEE80211_NUM_TIDS];
 282         struct tid_ampdu_tx *tid_start_tx[IEEE80211_NUM_TIDS];
 283         unsigned long last_addba_req_time[IEEE80211_NUM_TIDS];
 284         u8 addba_req_num[IEEE80211_NUM_TIDS];
 285         u8 dialog_token_allocator;
 286 };
 287
 288
 289 /* Value to indicate no TID reservation */
 290 #define IEEE80211_TID_UNRESERVED        0xff
 291
 292 #define IEEE80211_FAST_XMIT_MAX_IV      18
 293
 294 /**
 295  * struct ieee80211_fast_tx - TX fastpath information
 296  * @key: key to use for hw crypto
 297  * @hdr: the 802.11 header to put with the frame
 298  * @hdr_len: actual 802.11 header length
 299  * @sa_offs: offset of the SA
 300  * @da_offs: offset of the DA
 301  * @pn_offs: offset where to put PN for crypto (or 0 if not needed)
 302  * @band: band this will be transmitted on, for tx_info
 303  * @rcu_head: RCU head to free this struct
 304  *
 305  * This struct is small enough so that the common case (maximum crypto
 306  * header length of 8 like for CCMP/GCMP) fits into a single 64-byte
 307  * cache line.
 308  */
 309 struct ieee80211_fast_tx {
 310         struct ieee80211_key *key;
 311         u8 hdr_len;
 312         u8 sa_offs, da_offs, pn_offs;
 313         u8 band;
 314         u8 hdr[30 + 2 + IEEE80211_FAST_XMIT_MAX_IV +
 315                sizeof(rfc1042_header)] __aligned(2);
 316
 317         struct rcu_head rcu_head;
 318 };
 319
 320 /**
 321  * struct ieee80211_fast_rx - RX fastpath information
 322  * @dev: netdevice for reporting the SKB
 323  * @vif_type: (P2P-less) interface type of the original sdata (sdata->vif.type)
 324  * @vif_addr: interface address
 325  * @rfc1042_hdr: copy of the RFC 1042 SNAP header (to have in cache)
 326  * @control_port_protocol: control port protocol copied from sdata
 327  * @expected_ds_bits: from/to DS bits expected
 328  * @icv_len: length of the MIC if present
 329  * @key: bool indicating encryption is expected (key is set)
 330  * @sta_notify: notify the MLME code (once)
 331  * @internal_forward: forward froms internally on AP/VLAN type interfaces
 332  * @uses_rss: copy of USES_RSS hw flag
 333  * @da_offs: offset of the DA in the header (for header conversion)
 334  * @sa_offs: offset of the SA in the header (for header conversion)
 335  * @rcu_head: RCU head for freeing this structure
 336  */
 337 struct ieee80211_fast_rx {
 338         struct net_device *dev;
 339         enum nl80211_iftype vif_type;
 340         u8 vif_addr[ETH_ALEN] __aligned(2);
 341         u8 rfc1042_hdr[6] __aligned(2);
 342         __be16 control_port_protocol;
 343         __le16 expected_ds_bits;
 344         u8 icv_len;
 345         u8 key:1,
 346            sta_notify:1,
 347            internal_forward:1,
 348            uses_rss:1;
 349         u8 da_offs, sa_offs;
 350
 351         struct rcu_head rcu_head;
 352 };
 353
 354 /* we use only values in the range 0-100, so pick a large precision */
 355 DECLARE_EWMA(mesh_fail_avg, 20, 8)
 356 DECLARE_EWMA(mesh_tx_rate_avg, 8, 16)
 357
 358 /**
 359  * struct mesh_sta - mesh STA information
 360  * @plink_lock: serialize access to plink fields
 361  * @llid: Local link ID
 362  * @plid: Peer link ID
 363  * @aid: local aid supplied by peer
 364  * @reason: Cancel reason on PLINK_HOLDING state
 365  * @plink_retries: Retries in establishment
 366  * @plink_state: peer link state
 367  * @plink_timeout: timeout of peer link
 368  * @plink_timer: peer link watch timer
 369  * @plink_sta: peer link watch timer's sta_info
 370  * @t_offset: timing offset relative to this host
 371  * @t_offset_setpoint: reference timing offset of this sta to be used when
 372  *      calculating clockdrift
 373  * @local_pm: local link-specific power save mode
 374  * @peer_pm: peer-specific power save mode towards local STA
 375  * @nonpeer_pm: STA power save mode towards non-peer neighbors
 376  * @processed_beacon: set to true after peer rates and capabilities are
 377  *      processed
 378  * @connected_to_gate: true if mesh STA has a path to a mesh gate
 379  * @fail_avg: moving percentage of failed MSDUs
 380  * @tx_rate_avg: moving average of tx bitrate
 381  */
 382 struct mesh_sta {
 383         struct timer_list plink_timer;
 384         struct sta_info *plink_sta;
 385
 386         s64 t_offset;
 387         s64 t_offset_setpoint;
 388
 389         spinlock_t plink_lock;
 390         u16 llid;
 391         u16 plid;
 392         u16 aid;
 393         u16 reason;
 394         u8 plink_retries;
 395
 396         bool processed_beacon;
 397         bool connected_to_gate;
 398
 399         enum nl80211_plink_state plink_state;
 400         u32 plink_timeout;
 401
 402         /* mesh power save */
 403         enum nl80211_mesh_power_mode local_pm;
 404         enum nl80211_mesh_power_mode peer_pm;
 405         enum nl80211_mesh_power_mode nonpeer_pm;
 406
 407         /* moving percentage of failed MSDUs */
 408         struct ewma_mesh_fail_avg fail_avg;
 409         /* moving average of tx bitrate */
 410         struct ewma_mesh_tx_rate_avg tx_rate_avg;
 411 };
 412
 413 DECLARE_EWMA(signal, 10, 8)
 414
 415 struct ieee80211_sta_rx_stats {
 416         unsigned long packets;
 417         unsigned long last_rx;
 418         unsigned long num_duplicates;
 419         unsigned long fragments;
 420         unsigned long dropped;
 421         int last_signal;
 422         u8 chains;
 423         s8 chain_signal_last[IEEE80211_MAX_CHAINS];
 424         u32 last_rate;
 425         struct u64_stats_sync syncp;
 426         u64 bytes;
 427         u64 msdu[IEEE80211_NUM_TIDS + 1];
 428 };
 429
 430 /*
 431  * The bandwidth threshold below which the per-station CoDel parameters will be
 432  * scaled to be more lenient (to prevent starvation of slow stations). This
 433  * value will be scaled by the number of active stations when it is being
 434  * applied.
 435  */
 436 #define STA_SLOW_THRESHOLD 6000 /* 6 Mbps */
 437
 438 /**
 439  * struct sta_info - STA information
 440  *
 441  * This structure collects information about a station that
 442  * mac80211 is communicating with.
 443  *
 444  * @list: global linked list entry
 445  * @free_list: list entry for keeping track of stations to free
 446  * @hash_node: hash node for rhashtable
 447  * @addr: station's MAC address - duplicated from public part to
 448  *      let the hash table work with just a single cacheline
 449  * @local: pointer to the global information
 450  * @sdata: virtual interface this station belongs to
 451  * @ptk: peer keys negotiated with this station, if any
 452  * @ptk_idx: last installed peer key index
 453  * @gtk: group keys negotiated with this station, if any
 454  * @rate_ctrl: rate control algorithm reference
 455  * @rate_ctrl_lock: spinlock used to protect rate control data
 456  *      (data inside the algorithm, so serializes calls there)
 457  * @rate_ctrl_priv: rate control private per-STA pointer
 458  * @lock: used for locking all fields that require locking, see comments
 459  *      in the header file.
 460  * @drv_deliver_wk: used for delivering frames after driver PS unblocking
 461  * @listen_interval: listen interval of this station, when we're acting as AP
 462  * @_flags: STA flags, see &enum ieee80211_sta_info_flags, do not use directly
 463  * @ps_lock: used for powersave (when mac80211 is the AP) related locking
 464  * @ps_tx_buf: buffers (per AC) of frames to transmit to this station
 465  *      when it leaves power saving state or polls
 466  * @tx_filtered: buffers (per AC) of frames we already tried to
 467  *      transmit but were filtered by hardware due to STA having
 468  *      entered power saving state, these are also delivered to
 469  *      the station when it leaves powersave or polls for frames
 470  * @driver_buffered_tids: bitmap of TIDs the driver has data buffered on
 471  * @txq_buffered_tids: bitmap of TIDs that mac80211 has txq data buffered on
 472  * @last_connected: time (in seconds) when a station got connected
 473  * @last_seq_ctrl: last received seq/frag number from this STA (per TID
 474  *      plus one for non-QoS frames)
 475  * @tid_seq: per-TID sequence numbers for sending to this STA
 476  * @airtime: per-AC struct airtime_info describing airtime statistics for this
 477  *      station
 478  * @airtime_weight: station weight for airtime fairness calculation purposes
 479  * @ampdu_mlme: A-MPDU state machine state
 480  * @mesh: mesh STA information
 481  * @debugfs_dir: debug filesystem directory dentry
 482  * @dead: set to true when sta is unlinked
 483  * @removed: set to true when sta is being removed from sta_list
 484  * @uploaded: set to true when sta is uploaded to the driver
 485  * @sta: station information we share with the driver
 486  * @sta_state: duplicates information about station state (for debug)
 487  * @rcu_head: RCU head used for freeing this station struct
 488  * @cur_max_bandwidth: maximum bandwidth to use for TX to the station,
 489  *      taken from HT/VHT capabilities or VHT operating mode notification
 490  * @known_smps_mode: the smps_mode the client thinks we are in. Relevant for
 491  *      AP only.
 492  * @cipher_scheme: optional cipher scheme for this station
 493  * @cparams: CoDel parameters for this station.
 494  * @reserved_tid: reserved TID (if any, otherwise IEEE80211_TID_UNRESERVED)
 495  * @fast_tx: TX fastpath information
 496  * @fast_rx: RX fastpath information
 497  * @tdls_chandef: a TDLS peer can have a wider chandef that is compatible to
 498  *      the BSS one.
 499  * @tx_stats: TX statistics
 500  * @tx_stats.packets: # of packets transmitted
 501  * @tx_stats.bytes: # of bytes in all packets transmitted
 502  * @tx_stats.last_rate: last TX rate
 503  * @tx_stats.msdu: # of transmitted MSDUs per TID
 504  * @rx_stats: RX statistics
 505  * @rx_stats_avg: averaged RX statistics
 506  * @rx_stats_avg.signal: averaged signal
 507  * @rx_stats_avg.chain_signal: averaged per-chain signal
 508  * @pcpu_rx_stats: per-CPU RX statistics, assigned only if the driver needs
 509  *      this (by advertising the USES_RSS hw flag)
 510  * @status_stats: TX status statistics
 511  * @status_stats.filtered: # of filtered frames
 512  * @status_stats.retry_failed: # of frames that failed after retry
 513  * @status_stats.retry_count: # of retries attempted
 514  * @status_stats.lost_packets: # of lost packets
 515  * @status_stats.last_tdls_pkt_time: timestamp of last TDLS packet
 516  * @status_stats.msdu_retries: # of MSDU retries
 517  * @status_stats.msdu_failed: # of failed MSDUs
 518  * @status_stats.last_ack: last ack timestamp (jiffies)
 519  * @status_stats.last_ack_signal: last ACK signal
 520  * @status_stats.ack_signal_filled: last ACK signal validity
 521  * @status_stats.avg_ack_signal: average ACK signal
 522  */
 523 struct sta_info {
 524         /* General information, mostly static */
 525         struct list_head list, free_list;
 526         struct rcu_head rcu_head;
 527         struct rhlist_head hash_node;
 528         u8 addr[ETH_ALEN];
 529         struct ieee80211_local *local;
 530         struct ieee80211_sub_if_data *sdata;
 531         struct ieee80211_key __rcu *gtk[NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS];
 532         struct ieee80211_key __rcu *ptk[NUM_DEFAULT_KEYS];
 533         u8 ptk_idx;
 534         struct rate_control_ref *rate_ctrl;
 535         void *rate_ctrl_priv;
 536         spinlock_t rate_ctrl_lock;
 537         spinlock_t lock;
 538
 539         struct ieee80211_fast_tx __rcu *fast_tx;
 540         struct ieee80211_fast_rx __rcu *fast_rx;
 541         struct ieee80211_sta_rx_stats __percpu *pcpu_rx_stats;
 542
 543 #ifdef CONFIG_MAC80211_MESH
 544         struct mesh_sta *mesh;
 545 #endif
 546
 547         struct work_struct drv_deliver_wk;
 548
 549         u16 listen_interval;
 550
 551         bool dead;
 552         bool removed;
 553
 554         bool uploaded;
 555
 556         enum ieee80211_sta_state sta_state;
 557
 558         /* use the accessors defined below */
 559         unsigned long _flags;
 560
 561         /* STA powersave lock and frame queues */
 562         spinlock_t ps_lock;
 563         struct sk_buff_head ps_tx_buf[IEEE80211_NUM_ACS];
 564         struct sk_buff_head tx_filtered[IEEE80211_NUM_ACS];
 565         unsigned long driver_buffered_tids;
 566         unsigned long txq_buffered_tids;
 567
 568         long last_connected;
 569
 570         /* Updated from RX path only, no locking requirements */
 571         struct ieee80211_sta_rx_stats rx_stats;
 572         struct {
 573                 struct ewma_signal signal;
 574                 struct ewma_signal chain_signal[IEEE80211_MAX_CHAINS];
 575         } rx_stats_avg;
 576
 577         /* Plus 1 for non-QoS frames */
 578         __le16 last_seq_ctrl[IEEE80211_NUM_TIDS + 1];
 579
 580         /* Updated from TX status path only, no locking requirements */
 581         struct {
 582                 unsigned long filtered;
 583                 unsigned long retry_failed, retry_count;
 584                 unsigned int lost_packets;
 585                 unsigned long last_tdls_pkt_time;
 586                 u64 msdu_retries[IEEE80211_NUM_TIDS + 1];
 587                 u64 msdu_failed[IEEE80211_NUM_TIDS + 1];
 588                 unsigned long last_ack;
 589                 s8 last_ack_signal;
 590                 bool ack_signal_filled;
 591                 struct ewma_avg_signal avg_ack_signal;
 592         } status_stats;
 593
 594         /* Updated from TX path only, no locking requirements */
 595         struct {
 596                 u64 packets[IEEE80211_NUM_ACS];
 597                 u64 bytes[IEEE80211_NUM_ACS];
 598                 struct ieee80211_tx_rate last_rate;
 599                 u64 msdu[IEEE80211_NUM_TIDS + 1];
 600         } tx_stats;
 601         u16 tid_seq[IEEE80211_QOS_CTL_TID_MASK + 1];
 602
 603         struct airtime_info airtime[IEEE80211_NUM_ACS];
 604         u16 airtime_weight;
 605
 606         /*
 607          * Aggregation information, locked with lock.
 608          */
 609         struct sta_ampdu_mlme ampdu_mlme;
 610
 611 #ifdef CONFIG_MAC80211_DEBUGFS
 612         struct dentry *debugfs_dir;
 613 #endif
 614
 615         enum ieee80211_sta_rx_bandwidth cur_max_bandwidth;
 616
 617         enum ieee80211_smps_mode known_smps_mode;
 618         const struct ieee80211_cipher_scheme *cipher_scheme;
 619
 620         struct codel_params cparams;
 621
 622         u8 reserved_tid;
 623
 624         struct cfg80211_chan_def tdls_chandef;
 625
 626         /* keep last! */
 627         struct ieee80211_sta sta;
 628 };
 629
 630 static inline enum nl80211_plink_state sta_plink_state(struct sta_info *sta)
 631 {
 632 #ifdef CONFIG_MAC80211_MESH
 633         return sta->mesh->plink_state;
 634 #endif
 635         return NL80211_PLINK_LISTEN;
 636 }
 637
 638 static inline void set_sta_flag(struct sta_info *sta,
 639                                 enum ieee80211_sta_info_flags flag)
 640 {
 641         WARN_ON(flag == WLAN_STA_AUTH ||
 642                 flag == WLAN_STA_ASSOC ||
 643                 flag == WLAN_STA_AUTHORIZED);
 644         set_bit(flag, &sta->_flags);
 645 }
 646
 647 static inline void clear_sta_flag(struct sta_info *sta,
 648                                   enum ieee80211_sta_info_flags flag)
 649 {
 650         WARN_ON(flag == WLAN_STA_AUTH ||
 651                 flag == WLAN_STA_ASSOC ||
 652                 flag == WLAN_STA_AUTHORIZED);
 653         clear_bit(flag, &sta->_flags);
 654 }
 655
 656 static inline int test_sta_flag(struct sta_info *sta,
 657                                 enum ieee80211_sta_info_flags flag)
 658 {
 659         return test_bit(flag, &sta->_flags);
 660 }
 661
 662 static inline int test_and_clear_sta_flag(struct sta_info *sta,
 663                                           enum ieee80211_sta_info_flags flag)
 664 {
 665         WARN_ON(flag == WLAN_STA_AUTH ||
 666                 flag == WLAN_STA_ASSOC ||
 667                 flag == WLAN_STA_AUTHORIZED);
 668         return test_and_clear_bit(flag, &sta->_flags);
 669 }
 670
 671 static inline int test_and_set_sta_flag(struct sta_info *sta,
 672                                         enum ieee80211_sta_info_flags flag)
 673 {
 674         WARN_ON(flag == WLAN_STA_AUTH ||
 675                 flag == WLAN_STA_ASSOC ||
 676                 flag == WLAN_STA_AUTHORIZED);
 677         return test_and_set_bit(flag, &sta->_flags);
 678 }
 679
 680 int sta_info_move_state(struct sta_info *sta,
 681                         enum ieee80211_sta_state new_state);
 682
 683 static inline void sta_info_pre_move_state(struct sta_info *sta,
 684                                            enum ieee80211_sta_state new_state)
 685 {
 686         int ret;
 687
 688         WARN_ON_ONCE(test_sta_flag(sta, WLAN_STA_INSERTED));
 689
 690         ret = sta_info_move_state(sta, new_state);
 691         WARN_ON_ONCE(ret);
 692 }
 693
 694
 695 void ieee80211_assign_tid_tx(struct sta_info *sta, int tid,
 696                              struct tid_ampdu_tx *tid_tx);
 697
 698 static inline struct tid_ampdu_tx *
 699 rcu_dereference_protected_tid_tx(struct sta_info *sta, int tid)
 700 {
 701         return rcu_dereference_protected(sta->ampdu_mlme.tid_tx[tid],
 702                                          lockdep_is_held(&sta->lock) ||
 703                                          lockdep_is_held(&sta->ampdu_mlme.mtx));
 704 }
 705
 706 /* Maximum number of frames to buffer per power saving station per AC */
 707 #define STA_MAX_TX_BUFFER       64
 708
 709 /* Minimum buffered frame expiry time. If STA uses listen interval that is
 710  * smaller than this value, the minimum value here is used instead. */
 711 #define STA_TX_BUFFER_EXPIRE (10 * HZ)
 712
 713 /* How often station data is cleaned up (e.g., expiration of buffered frames)
 714  */
 715 #define STA_INFO_CLEANUP_INTERVAL (10 * HZ)
 716
 717 struct rhlist_head *sta_info_hash_lookup(struct ieee80211_local *local,
 718                                          const u8 *addr);
 719
 720 /*
 721  * Get a STA info, must be under RCU read lock.
 722  */
 723 struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
 724                               const u8 *addr);
 725
 726 struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
 727                                   const u8 *addr);
 728
 729 #define for_each_sta_info(local, _addr, _sta, _tmp)                     \
 730         rhl_for_each_entry_rcu(_sta, _tmp,                              \
 731                                sta_info_hash_lookup(local, _addr), hash_node)
 732
 733 /*
 734  * Get STA info by index, BROKEN!
 735  */
 736 struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
 737                                      int idx);
 738 /*
 739  * Create a new STA info, caller owns returned structure
 740  * until sta_info_insert().
 741  */
 742 struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
 743                                 const u8 *addr, gfp_t gfp);
 744
 745 void sta_info_free(struct ieee80211_local *local, struct sta_info *sta);
 746
 747 /*
 748  * Insert STA info into hash table/list, returns zero or a
 749  * -EEXIST if (if the same MAC address is already present).
 750  *
 751  * Calling the non-rcu version makes the caller relinquish,
 752  * the _rcu version calls read_lock_rcu() and must be called
 753  * without it held.
 754  */
 755 int sta_info_insert(struct sta_info *sta);
 756 int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU);
 757
 758 int __must_check __sta_info_destroy(struct sta_info *sta);
 759 int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata,
 760                           const u8 *addr);
 761 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
 762                               const u8 *addr);
 763
 764 void sta_info_recalc_tim(struct sta_info *sta);
 765
 766 int sta_info_init(struct ieee80211_local *local);
 767 void sta_info_stop(struct ieee80211_local *local);
 768
 769 /**
 770  * sta_info_flush - flush matching STA entries from the STA table
 771  *
 772  * Returns the number of removed STA entries.
 773  *
 774  * @sdata: sdata to remove all stations from
 775  * @vlans: if the given interface is an AP interface, also flush VLANs
 776  */
 777 int __sta_info_flush(struct ieee80211_sub_if_data *sdata, bool vlans);
 778
 779 static inline int sta_info_flush(struct ieee80211_sub_if_data *sdata)
 780 {
 781         return __sta_info_flush(sdata, false);
 782 }
 783
 784 void sta_set_rate_info_tx(struct sta_info *sta,
 785                           const struct ieee80211_tx_rate *rate,
 786                           struct rate_info *rinfo);
 787 void sta_set_sinfo(struct sta_info *sta, struct station_info *sinfo,
 788                    bool tidstats);
 789
 790 u32 sta_get_expected_throughput(struct sta_info *sta);
 791
 792 void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
 793                           unsigned long exp_time);
 794 u8 sta_info_tx_streams(struct sta_info *sta);
 795
 796 void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta);
 797 void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta);
 798 void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta);
 799
 800 unsigned long ieee80211_sta_last_active(struct sta_info *sta);
 801
 802 enum sta_stats_type {
 803         STA_STATS_RATE_TYPE_INVALID = 0,
 804         STA_STATS_RATE_TYPE_LEGACY,
 805         STA_STATS_RATE_TYPE_HT,
 806         STA_STATS_RATE_TYPE_VHT,
 807         STA_STATS_RATE_TYPE_HE,
 808 };
 809
 810 #define STA_STATS_FIELD_HT_MCS          GENMASK( 7,  0)
 811 #define STA_STATS_FIELD_LEGACY_IDX      GENMASK( 3,  0)
 812 #define STA_STATS_FIELD_LEGACY_BAND     GENMASK( 7,  4)
 813 #define STA_STATS_FIELD_VHT_MCS         GENMASK( 3,  0)
 814 #define STA_STATS_FIELD_VHT_NSS         GENMASK( 7,  4)
 815 #define STA_STATS_FIELD_HE_MCS          GENMASK( 3,  0)
 816 #define STA_STATS_FIELD_HE_NSS          GENMASK( 7,  4)
 817 #define STA_STATS_FIELD_BW              GENMASK(11,  8)
 818 #define STA_STATS_FIELD_SGI             GENMASK(12, 12)
 819 #define STA_STATS_FIELD_TYPE            GENMASK(15, 13)
 820 #define STA_STATS_FIELD_HE_RU           GENMASK(18, 16)
 821 #define STA_STATS_FIELD_HE_GI           GENMASK(20, 19)
 822 #define STA_STATS_FIELD_HE_DCM          GENMASK(21, 21)
 823
 824 #define STA_STATS_FIELD(_n, _v)         FIELD_PREP(STA_STATS_FIELD_ ## _n, _v)
 825 #define STA_STATS_GET(_n, _v)           FIELD_GET(STA_STATS_FIELD_ ## _n, _v)
 826
 827 #define STA_STATS_RATE_INVALID          0
 828
 829 static inline u32 sta_stats_encode_rate(struct ieee80211_rx_status *s)
 830 {
 831         u32 r;
 832
 833         r = STA_STATS_FIELD(BW, s->bw);
 834
 835         if (s->enc_flags & RX_ENC_FLAG_SHORT_GI)
 836                 r |= STA_STATS_FIELD(SGI, 1);
 837
 838         switch (s->encoding) {
 839         case RX_ENC_VHT:
 840                 r |= STA_STATS_FIELD(TYPE, STA_STATS_RATE_TYPE_VHT);
 841                 r |= STA_STATS_FIELD(VHT_NSS, s->nss);
 842                 r |= STA_STATS_FIELD(VHT_MCS, s->rate_idx);
 843                 break;
 844         case RX_ENC_HT:
 845                 r |= STA_STATS_FIELD(TYPE, STA_STATS_RATE_TYPE_HT);
 846                 r |= STA_STATS_FIELD(HT_MCS, s->rate_idx);
 847                 break;
 848         case RX_ENC_LEGACY:
 849                 r |= STA_STATS_FIELD(TYPE, STA_STATS_RATE_TYPE_LEGACY);
 850                 r |= STA_STATS_FIELD(LEGACY_BAND, s->band);
 851                 r |= STA_STATS_FIELD(LEGACY_IDX, s->rate_idx);
 852                 break;
 853         case RX_ENC_HE:
 854                 r |= STA_STATS_FIELD(TYPE, STA_STATS_RATE_TYPE_HE);
 855                 r |= STA_STATS_FIELD(HE_NSS, s->nss);
 856                 r |= STA_STATS_FIELD(HE_MCS, s->rate_idx);
 857                 r |= STA_STATS_FIELD(HE_GI, s->he_gi);
 858                 r |= STA_STATS_FIELD(HE_RU, s->he_ru);
 859                 r |= STA_STATS_FIELD(HE_DCM, s->he_dcm);
 860                 break;
 861         default:
 862                 WARN_ON(1);
 863                 return STA_STATS_RATE_INVALID;
 864         }
 865
 866         return r;
 867 }
 868
 869 #endif /* STA_INFO_H */