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

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  1 /*
  2  * Copyright 2002-2005, Instant802 Networks, Inc.
  3  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
  4  * Copyright 2013-2014  Intel Mobile Communications GmbH
  5  * Copyright (C) 2015 - 2017 Intel Deutschland GmbH
  6  * Copyright (C) 2018 Intel Corporation
  7  *
  8  * This program is free software; you can redistribute it and/or modify
  9  * it under the terms of the GNU General Public License version 2 as
 10  * published by the Free Software Foundation.
 11  */
 12 
 13 #include <linux/module.h>
 14 #include <linux/init.h>
 15 #include <linux/etherdevice.h>
 16 #include <linux/netdevice.h>
 17 #include <linux/types.h>
 18 #include <linux/slab.h>
 19 #include <linux/skbuff.h>
 20 #include <linux/if_arp.h>
 21 #include <linux/timer.h>
 22 #include <linux/rtnetlink.h>
 23 
 24 #include <net/codel.h>
 25 #include <net/mac80211.h>
 26 #include "ieee80211_i.h"
 27 #include "driver-ops.h"
 28 #include "rate.h"
 29 #include "sta_info.h"
 30 #include "debugfs_sta.h"
 31 #include "mesh.h"
 32 #include "wme.h"
 33 
 34 /**
 35  * DOC: STA information lifetime rules
 36  *
 37  * STA info structures (&struct sta_info) are managed in a hash table
 38  * for faster lookup and a list for iteration. They are managed using
 39  * RCU, i.e. access to the list and hash table is protected by RCU.
 40  *
 41  * Upon allocating a STA info structure with sta_info_alloc(), the caller
 42  * owns that structure. It must then insert it into the hash table using
 43  * either sta_info_insert() or sta_info_insert_rcu(); only in the latter
 44  * case (which acquires an rcu read section but must not be called from
 45  * within one) will the pointer still be valid after the call. Note that
 46  * the caller may not do much with the STA info before inserting it, in
 47  * particular, it may not start any mesh peer link management or add
 48  * encryption keys.
 49  *
 50  * When the insertion fails (sta_info_insert()) returns non-zero), the
 51  * structure will have been freed by sta_info_insert()!
 52  *
 53  * Station entries are added by mac80211 when you establish a link with a
 54  * peer. This means different things for the different type of interfaces
 55  * we support. For a regular station this mean we add the AP sta when we
 56  * receive an association response from the AP. For IBSS this occurs when
 57  * get to know about a peer on the same IBSS. For WDS we add the sta for
 58  * the peer immediately upon device open. When using AP mode we add stations
 59  * for each respective station upon request from userspace through nl80211.
 60  *
 61  * In order to remove a STA info structure, various sta_info_destroy_*()
 62  * calls are available.
 63  *
 64  * There is no concept of ownership on a STA entry, each structure is
 65  * owned by the global hash table/list until it is removed. All users of
 66  * the structure need to be RCU protected so that the structure won't be
 67  * freed before they are done using it.
 68  */
 69 
 70 static const struct rhashtable_params sta_rht_params = {
 71         .nelem_hint = 3, /* start small */
 72         .automatic_shrinking = true,
 73         .head_offset = offsetof(struct sta_info, hash_node),
 74         .key_offset = offsetof(struct sta_info, addr),
 75         .key_len = ETH_ALEN,
 76         .max_size = CONFIG_MAC80211_STA_HASH_MAX_SIZE,
 77 };
 78 
 79 /* Caller must hold local->sta_mtx */
 80 static int sta_info_hash_del(struct ieee80211_local *local,
 81                              struct sta_info *sta)
 82 {
 83         return rhltable_remove(&local->sta_hash, &sta->hash_node,
 84                                sta_rht_params);
 85 }
 86 
 87 static void __cleanup_single_sta(struct sta_info *sta)
 88 {
 89         int ac, i;
 90         struct tid_ampdu_tx *tid_tx;
 91         struct ieee80211_sub_if_data *sdata = sta->sdata;
 92         struct ieee80211_local *local = sdata->local;
 93         struct ps_data *ps;
 94 
 95         if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
 96             test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
 97             test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
 98                 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
 99                     sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
100                         ps = &sdata->bss->ps;
101                 else if (ieee80211_vif_is_mesh(&sdata->vif))
102                         ps = &sdata->u.mesh.ps;
103                 else
104                         return;
105 
106                 clear_sta_flag(sta, WLAN_STA_PS_STA);
107                 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
108                 clear_sta_flag(sta, WLAN_STA_PS_DELIVER);
109 
110                 atomic_dec(&ps->num_sta_ps);
111         }
112 
113         if (sta->sta.txq[0]) {
114                 for (i = 0; i < ARRAY_SIZE(sta->sta.txq); i++) {
115                         struct txq_info *txqi;
116 
117                         if (!sta->sta.txq[i])
118                                 continue;
119 
120                         txqi = to_txq_info(sta->sta.txq[i]);
121 
122                         ieee80211_txq_purge(local, txqi);
123                 }
124         }
125 
126         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
127                 local->total_ps_buffered -= skb_queue_len(&sta->ps_tx_buf[ac]);
128                 ieee80211_purge_tx_queue(&local->hw, &sta->ps_tx_buf[ac]);
129                 ieee80211_purge_tx_queue(&local->hw, &sta->tx_filtered[ac]);
130         }
131 
132         if (ieee80211_vif_is_mesh(&sdata->vif))
133                 mesh_sta_cleanup(sta);
134 
135         cancel_work_sync(&sta->drv_deliver_wk);
136 
137         /*
138          * Destroy aggregation state here. It would be nice to wait for the
139          * driver to finish aggregation stop and then clean up, but for now
140          * drivers have to handle aggregation stop being requested, followed
141          * directly by station destruction.
142          */
143         for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
144                 kfree(sta->ampdu_mlme.tid_start_tx[i]);
145                 tid_tx = rcu_dereference_raw(sta->ampdu_mlme.tid_tx[i]);
146                 if (!tid_tx)
147                         continue;
148                 ieee80211_purge_tx_queue(&local->hw, &tid_tx->pending);
149                 kfree(tid_tx);
150         }
151 }
152 
153 static void cleanup_single_sta(struct sta_info *sta)
154 {
155         struct ieee80211_sub_if_data *sdata = sta->sdata;
156         struct ieee80211_local *local = sdata->local;
157 
158         __cleanup_single_sta(sta);
159         sta_info_free(local, sta);
160 }
161 
162 struct rhlist_head *sta_info_hash_lookup(struct ieee80211_local *local,
163                                          const u8 *addr)
164 {
165         return rhltable_lookup(&local->sta_hash, addr, sta_rht_params);
166 }
167 
168 /* protected by RCU */
169 struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
170                               const u8 *addr)
171 {
172         struct ieee80211_local *local = sdata->local;
173         struct rhlist_head *tmp;
174         struct sta_info *sta;
175 
176         rcu_read_lock();
177         for_each_sta_info(local, addr, sta, tmp) {
178                 if (sta->sdata == sdata) {
179                         rcu_read_unlock();
180                         /* this is safe as the caller must already hold
181                          * another rcu read section or the mutex
182                          */
183                         return sta;
184                 }
185         }
186         rcu_read_unlock();
187         return NULL;
188 }
189 
190 /*
191  * Get sta info either from the specified interface
192  * or from one of its vlans
193  */
194 struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
195                                   const u8 *addr)
196 {
197         struct ieee80211_local *local = sdata->local;
198         struct rhlist_head *tmp;
199         struct sta_info *sta;
200 
201         rcu_read_lock();
202         for_each_sta_info(local, addr, sta, tmp) {
203                 if (sta->sdata == sdata ||
204                     (sta->sdata->bss && sta->sdata->bss == sdata->bss)) {
205                         rcu_read_unlock();
206                         /* this is safe as the caller must already hold
207                          * another rcu read section or the mutex
208                          */
209                         return sta;
210                 }
211         }
212         rcu_read_unlock();
213         return NULL;
214 }
215 
216 struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
217                                      int idx)
218 {
219         struct ieee80211_local *local = sdata->local;
220         struct sta_info *sta;
221         int i = 0;
222 
223         list_for_each_entry_rcu(sta, &local->sta_list, list) {
224                 if (sdata != sta->sdata)
225                         continue;
226                 if (i < idx) {
227                         ++i;
228                         continue;
229                 }
230                 return sta;
231         }
232 
233         return NULL;
234 }
235 
236 /**
237  * sta_info_free - free STA
238  *
239  * @local: pointer to the global information
240  * @sta: STA info to free
241  *
242  * This function must undo everything done by sta_info_alloc()
243  * that may happen before sta_info_insert(). It may only be
244  * called when sta_info_insert() has not been attempted (and
245  * if that fails, the station is freed anyway.)
246  */
247 void sta_info_free(struct ieee80211_local *local, struct sta_info *sta)
248 {
249         if (sta->rate_ctrl)
250                 rate_control_free_sta(sta);
251 
252         sta_dbg(sta->sdata, "Destroyed STA %pM\n", sta->sta.addr);
253 
254         if (sta->sta.txq[0])
255                 kfree(to_txq_info(sta->sta.txq[0]));
256         kfree(rcu_dereference_raw(sta->sta.rates));
257 #ifdef CONFIG_MAC80211_MESH
258         kfree(sta->mesh);
259 #endif
260         free_percpu(sta->pcpu_rx_stats);
261         kfree(sta);
262 }
263 
264 /* Caller must hold local->sta_mtx */
265 static int sta_info_hash_add(struct ieee80211_local *local,
266                              struct sta_info *sta)
267 {
268         return rhltable_insert(&local->sta_hash, &sta->hash_node,
269                                sta_rht_params);
270 }
271 
272 static void sta_deliver_ps_frames(struct work_struct *wk)
273 {
274         struct sta_info *sta;
275 
276         sta = container_of(wk, struct sta_info, drv_deliver_wk);
277 
278         if (sta->dead)
279                 return;
280 
281         local_bh_disable();
282         if (!test_sta_flag(sta, WLAN_STA_PS_STA))
283                 ieee80211_sta_ps_deliver_wakeup(sta);
284         else if (test_and_clear_sta_flag(sta, WLAN_STA_PSPOLL))
285                 ieee80211_sta_ps_deliver_poll_response(sta);
286         else if (test_and_clear_sta_flag(sta, WLAN_STA_UAPSD))
287                 ieee80211_sta_ps_deliver_uapsd(sta);
288         local_bh_enable();
289 }
290 
291 static int sta_prepare_rate_control(struct ieee80211_local *local,
292                                     struct sta_info *sta, gfp_t gfp)
293 {
294         if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL))
295                 return 0;
296 
297         sta->rate_ctrl = local->rate_ctrl;
298         sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl,
299                                                      sta, gfp);
300         if (!sta->rate_ctrl_priv)
301                 return -ENOMEM;
302 
303         return 0;
304 }
305 
306 struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
307                                 const u8 *addr, gfp_t gfp)
308 {
309         struct ieee80211_local *local = sdata->local;
310         struct ieee80211_hw *hw = &local->hw;
311         struct sta_info *sta;
312         int i;
313 
314         sta = kzalloc(sizeof(*sta) + hw->sta_data_size, gfp);
315         if (!sta)
316                 return NULL;
317 
318         if (ieee80211_hw_check(hw, USES_RSS)) {
319                 sta->pcpu_rx_stats =
320                         alloc_percpu_gfp(struct ieee80211_sta_rx_stats, gfp);
321                 if (!sta->pcpu_rx_stats)
322                         goto free;
323         }
324 
325         spin_lock_init(&sta->lock);
326         spin_lock_init(&sta->ps_lock);
327         INIT_WORK(&sta->drv_deliver_wk, sta_deliver_ps_frames);
328         INIT_WORK(&sta->ampdu_mlme.work, ieee80211_ba_session_work);
329         mutex_init(&sta->ampdu_mlme.mtx);
330 #ifdef CONFIG_MAC80211_MESH
331         if (ieee80211_vif_is_mesh(&sdata->vif)) {
332                 sta->mesh = kzalloc(sizeof(*sta->mesh), gfp);
333                 if (!sta->mesh)
334                         goto free;
335                 sta->mesh->plink_sta = sta;
336                 spin_lock_init(&sta->mesh->plink_lock);
337                 if (ieee80211_vif_is_mesh(&sdata->vif) &&
338                     !sdata->u.mesh.user_mpm)
339                         timer_setup(&sta->mesh->plink_timer, mesh_plink_timer,
340                                     0);
341                 sta->mesh->nonpeer_pm = NL80211_MESH_POWER_ACTIVE;
342         }
343 #endif
344 
345         memcpy(sta->addr, addr, ETH_ALEN);
346         memcpy(sta->sta.addr, addr, ETH_ALEN);
347         sta->sta.max_rx_aggregation_subframes =
348                 local->hw.max_rx_aggregation_subframes;
349 
350         sta->local = local;
351         sta->sdata = sdata;
352         sta->rx_stats.last_rx = jiffies;
353 
354         u64_stats_init(&sta->rx_stats.syncp);
355 
356         sta->sta_state = IEEE80211_STA_NONE;
357 
358         /* Mark TID as unreserved */
359         sta->reserved_tid = IEEE80211_TID_UNRESERVED;
360 
361         sta->last_connected = ktime_get_seconds();
362         ewma_signal_init(&sta->rx_stats_avg.signal);
363         ewma_avg_signal_init(&sta->status_stats.avg_ack_signal);
364         for (i = 0; i < ARRAY_SIZE(sta->rx_stats_avg.chain_signal); i++)
365                 ewma_signal_init(&sta->rx_stats_avg.chain_signal[i]);
366 
367         if (local->ops->wake_tx_queue) {
368                 void *txq_data;
369                 int size = sizeof(struct txq_info) +
370                            ALIGN(hw->txq_data_size, sizeof(void *));
371 
372                 txq_data = kcalloc(ARRAY_SIZE(sta->sta.txq), size, gfp);
373                 if (!txq_data)
374                         goto free;
375 
376                 for (i = 0; i < ARRAY_SIZE(sta->sta.txq); i++) {
377                         struct txq_info *txq = txq_data + i * size;
378 
379                         /* might not do anything for the bufferable MMPDU TXQ */
380                         ieee80211_txq_init(sdata, sta, txq, i);
381                 }
382         }
383 
384         if (sta_prepare_rate_control(local, sta, gfp))
385                 goto free_txq;
386 
387         sta->airtime_weight = IEEE80211_DEFAULT_AIRTIME_WEIGHT;
388 
389         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
390                 skb_queue_head_init(&sta->ps_tx_buf[i]);
391                 skb_queue_head_init(&sta->tx_filtered[i]);
392                 sta->airtime[i].deficit = sta->airtime_weight;
393         }
394 
395         for (i = 0; i < IEEE80211_NUM_TIDS; i++)
396                 sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX);
397 
398         sta->sta.smps_mode = IEEE80211_SMPS_OFF;
399         if (sdata->vif.type == NL80211_IFTYPE_AP ||
400             sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
401                 struct ieee80211_supported_band *sband;
402                 u8 smps;
403 
404                 sband = ieee80211_get_sband(sdata);
405                 if (!sband)
406                         goto free_txq;
407 
408                 smps = (sband->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >>
409                         IEEE80211_HT_CAP_SM_PS_SHIFT;
410                 /*
411                  * Assume that hostapd advertises our caps in the beacon and
412                  * this is the known_smps_mode for a station that just assciated
413                  */
414                 switch (smps) {
415                 case WLAN_HT_SMPS_CONTROL_DISABLED:
416                         sta->known_smps_mode = IEEE80211_SMPS_OFF;
417                         break;
418                 case WLAN_HT_SMPS_CONTROL_STATIC:
419                         sta->known_smps_mode = IEEE80211_SMPS_STATIC;
420                         break;
421                 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
422                         sta->known_smps_mode = IEEE80211_SMPS_DYNAMIC;
423                         break;
424                 default:
425                         WARN_ON(1);
426                 }
427         }
428 
429         sta->sta.max_rc_amsdu_len = IEEE80211_MAX_MPDU_LEN_HT_BA;
430 
431         sta->cparams.ce_threshold = CODEL_DISABLED_THRESHOLD;
432         sta->cparams.target = MS2TIME(20);
433         sta->cparams.interval = MS2TIME(100);
434         sta->cparams.ecn = true;
435 
436         sta_dbg(sdata, "Allocated STA %pM\n", sta->sta.addr);
437 
438         return sta;
439 
440 free_txq:
441         if (sta->sta.txq[0])
442                 kfree(to_txq_info(sta->sta.txq[0]));
443 free:
444         free_percpu(sta->pcpu_rx_stats);
445 #ifdef CONFIG_MAC80211_MESH
446         kfree(sta->mesh);
447 #endif
448         kfree(sta);
449         return NULL;
450 }
451 
452 static int sta_info_insert_check(struct sta_info *sta)
453 {
454         struct ieee80211_sub_if_data *sdata = sta->sdata;
455 
456         /*
457          * Can't be a WARN_ON because it can be triggered through a race:
458          * something inserts a STA (on one CPU) without holding the RTNL
459          * and another CPU turns off the net device.
460          */
461         if (unlikely(!ieee80211_sdata_running(sdata)))
462                 return -ENETDOWN;
463 
464         if (WARN_ON(ether_addr_equal(sta->sta.addr, sdata->vif.addr) ||
465                     is_multicast_ether_addr(sta->sta.addr)))
466                 return -EINVAL;
467 
468         /* The RCU read lock is required by rhashtable due to
469          * asynchronous resize/rehash.  We also require the mutex
470          * for correctness.
471          */
472         rcu_read_lock();
473         lockdep_assert_held(&sdata->local->sta_mtx);
474         if (ieee80211_hw_check(&sdata->local->hw, NEEDS_UNIQUE_STA_ADDR) &&
475             ieee80211_find_sta_by_ifaddr(&sdata->local->hw, sta->addr, NULL)) {
476                 rcu_read_unlock();
477                 return -ENOTUNIQ;
478         }
479         rcu_read_unlock();
480 
481         return 0;
482 }
483 
484 static int sta_info_insert_drv_state(struct ieee80211_local *local,
485                                      struct ieee80211_sub_if_data *sdata,
486                                      struct sta_info *sta)
487 {
488         enum ieee80211_sta_state state;
489         int err = 0;
490 
491         for (state = IEEE80211_STA_NOTEXIST; state < sta->sta_state; state++) {
492                 err = drv_sta_state(local, sdata, sta, state, state + 1);
493                 if (err)
494                         break;
495         }
496 
497         if (!err) {
498                 /*
499                  * Drivers using legacy sta_add/sta_remove callbacks only
500                  * get uploaded set to true after sta_add is called.
501                  */
502                 if (!local->ops->sta_add)
503                         sta->uploaded = true;
504                 return 0;
505         }
506 
507         if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
508                 sdata_info(sdata,
509                            "failed to move IBSS STA %pM to state %d (%d) - keeping it anyway\n",
510                            sta->sta.addr, state + 1, err);
511                 err = 0;
512         }
513 
514         /* unwind on error */
515         for (; state > IEEE80211_STA_NOTEXIST; state--)
516                 WARN_ON(drv_sta_state(local, sdata, sta, state, state - 1));
517 
518         return err;
519 }
520 
521 static void
522 ieee80211_recalc_p2p_go_ps_allowed(struct ieee80211_sub_if_data *sdata)
523 {
524         struct ieee80211_local *local = sdata->local;
525         bool allow_p2p_go_ps = sdata->vif.p2p;
526         struct sta_info *sta;
527 
528         rcu_read_lock();
529         list_for_each_entry_rcu(sta, &local->sta_list, list) {
530                 if (sdata != sta->sdata ||
531                     !test_sta_flag(sta, WLAN_STA_ASSOC))
532                         continue;
533                 if (!sta->sta.support_p2p_ps) {
534                         allow_p2p_go_ps = false;
535                         break;
536                 }
537         }
538         rcu_read_unlock();
539 
540         if (allow_p2p_go_ps != sdata->vif.bss_conf.allow_p2p_go_ps) {
541                 sdata->vif.bss_conf.allow_p2p_go_ps = allow_p2p_go_ps;
542                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_P2P_PS);
543         }
544 }
545 
546 /*
547  * should be called with sta_mtx locked
548  * this function replaces the mutex lock
549  * with a RCU lock
550  */
551 static int sta_info_insert_finish(struct sta_info *sta) __acquires(RCU)
552 {
553         struct ieee80211_local *local = sta->local;
554         struct ieee80211_sub_if_data *sdata = sta->sdata;
555         struct station_info *sinfo = NULL;
556         int err = 0;
557 
558         lockdep_assert_held(&local->sta_mtx);
559 
560         /* check if STA exists already */
561         if (sta_info_get_bss(sdata, sta->sta.addr)) {
562                 err = -EEXIST;
563                 goto out_err;
564         }
565 
566         sinfo = kzalloc(sizeof(struct station_info), GFP_KERNEL);
567         if (!sinfo) {
568                 err = -ENOMEM;
569                 goto out_err;
570         }
571 
572         local->num_sta++;
573         local->sta_generation++;
574         smp_mb();
575 
576         /* simplify things and don't accept BA sessions yet */
577         set_sta_flag(sta, WLAN_STA_BLOCK_BA);
578 
579         /* make the station visible */
580         err = sta_info_hash_add(local, sta);
581         if (err)
582                 goto out_drop_sta;
583 
584         list_add_tail_rcu(&sta->list, &local->sta_list);
585 
586         /* notify driver */
587         err = sta_info_insert_drv_state(local, sdata, sta);
588         if (err)
589                 goto out_remove;
590 
591         set_sta_flag(sta, WLAN_STA_INSERTED);
592 
593         if (sta->sta_state >= IEEE80211_STA_ASSOC) {
594                 ieee80211_recalc_min_chandef(sta->sdata);
595                 if (!sta->sta.support_p2p_ps)
596                         ieee80211_recalc_p2p_go_ps_allowed(sta->sdata);
597         }
598 
599         /* accept BA sessions now */
600         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
601 
602         ieee80211_sta_debugfs_add(sta);
603         rate_control_add_sta_debugfs(sta);
604 
605         sinfo->generation = local->sta_generation;
606         cfg80211_new_sta(sdata->dev, sta->sta.addr, sinfo, GFP_KERNEL);
607         kfree(sinfo);
608 
609         sta_dbg(sdata, "Inserted STA %pM\n", sta->sta.addr);
610 
611         /* move reference to rcu-protected */
612         rcu_read_lock();
613         mutex_unlock(&local->sta_mtx);
614 
615         if (ieee80211_vif_is_mesh(&sdata->vif))
616                 mesh_accept_plinks_update(sdata);
617 
618         return 0;
619  out_remove:
620         sta_info_hash_del(local, sta);
621         list_del_rcu(&sta->list);
622  out_drop_sta:
623         local->num_sta--;
624         synchronize_net();
625         __cleanup_single_sta(sta);
626  out_err:
627         mutex_unlock(&local->sta_mtx);
628         kfree(sinfo);
629         rcu_read_lock();
630         return err;
631 }
632 
633 int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU)
634 {
635         struct ieee80211_local *local = sta->local;
636         int err;
637 
638         might_sleep();
639 
640         mutex_lock(&local->sta_mtx);
641 
642         err = sta_info_insert_check(sta);
643         if (err) {
644                 mutex_unlock(&local->sta_mtx);
645                 rcu_read_lock();
646                 goto out_free;
647         }
648 
649         err = sta_info_insert_finish(sta);
650         if (err)
651                 goto out_free;
652 
653         return 0;
654  out_free:
655         sta_info_free(local, sta);
656         return err;
657 }
658 
659 int sta_info_insert(struct sta_info *sta)
660 {
661         int err = sta_info_insert_rcu(sta);
662 
663         rcu_read_unlock();
664 
665         return err;
666 }
667 
668 static inline void __bss_tim_set(u8 *tim, u16 id)
669 {
670         /*
671          * This format has been mandated by the IEEE specifications,
672          * so this line may not be changed to use the __set_bit() format.
673          */
674         tim[id / 8] |= (1 << (id % 8));
675 }
676 
677 static inline void __bss_tim_clear(u8 *tim, u16 id)
678 {
679         /*
680          * This format has been mandated by the IEEE specifications,
681          * so this line may not be changed to use the __clear_bit() format.
682          */
683         tim[id / 8] &= ~(1 << (id % 8));
684 }
685 
686 static inline bool __bss_tim_get(u8 *tim, u16 id)
687 {
688         /*
689          * This format has been mandated by the IEEE specifications,
690          * so this line may not be changed to use the test_bit() format.
691          */
692         return tim[id / 8] & (1 << (id % 8));
693 }
694 
695 static unsigned long ieee80211_tids_for_ac(int ac)
696 {
697         /* If we ever support TIDs > 7, this obviously needs to be adjusted */
698         switch (ac) {
699         case IEEE80211_AC_VO:
700                 return BIT(6) | BIT(7);
701         case IEEE80211_AC_VI:
702                 return BIT(4) | BIT(5);
703         case IEEE80211_AC_BE:
704                 return BIT(0) | BIT(3);
705         case IEEE80211_AC_BK:
706                 return BIT(1) | BIT(2);
707         default:
708                 WARN_ON(1);
709                 return 0;
710         }
711 }
712 
713 static void __sta_info_recalc_tim(struct sta_info *sta, bool ignore_pending)
714 {
715         struct ieee80211_local *local = sta->local;
716         struct ps_data *ps;
717         bool indicate_tim = false;
718         u8 ignore_for_tim = sta->sta.uapsd_queues;
719         int ac;
720         u16 id = sta->sta.aid;
721 
722         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
723             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
724                 if (WARN_ON_ONCE(!sta->sdata->bss))
725                         return;
726 
727                 ps = &sta->sdata->bss->ps;
728 #ifdef CONFIG_MAC80211_MESH
729         } else if (ieee80211_vif_is_mesh(&sta->sdata->vif)) {
730                 ps = &sta->sdata->u.mesh.ps;
731 #endif
732         } else {
733                 return;
734         }
735 
736         /* No need to do anything if the driver does all */
737         if (ieee80211_hw_check(&local->hw, AP_LINK_PS) && !local->ops->set_tim)
738                 return;
739 
740         if (sta->dead)
741                 goto done;
742 
743         /*
744          * If all ACs are delivery-enabled then we should build
745          * the TIM bit for all ACs anyway; if only some are then
746          * we ignore those and build the TIM bit using only the
747          * non-enabled ones.
748          */
749         if (ignore_for_tim == BIT(IEEE80211_NUM_ACS) - 1)
750                 ignore_for_tim = 0;
751 
752         if (ignore_pending)
753                 ignore_for_tim = BIT(IEEE80211_NUM_ACS) - 1;
754 
755         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
756                 unsigned long tids;
757 
758                 if (ignore_for_tim & ieee80211_ac_to_qos_mask[ac])
759                         continue;
760 
761                 indicate_tim |= !skb_queue_empty(&sta->tx_filtered[ac]) ||
762                                 !skb_queue_empty(&sta->ps_tx_buf[ac]);
763                 if (indicate_tim)
764                         break;
765 
766                 tids = ieee80211_tids_for_ac(ac);
767 
768                 indicate_tim |=
769                         sta->driver_buffered_tids & tids;
770                 indicate_tim |=
771                         sta->txq_buffered_tids & tids;
772         }
773 
774  done:
775         spin_lock_bh(&local->tim_lock);
776 
777         if (indicate_tim == __bss_tim_get(ps->tim, id))
778                 goto out_unlock;
779 
780         if (indicate_tim)
781                 __bss_tim_set(ps->tim, id);
782         else
783                 __bss_tim_clear(ps->tim, id);
784 
785         if (local->ops->set_tim && !WARN_ON(sta->dead)) {
786                 local->tim_in_locked_section = true;
787                 drv_set_tim(local, &sta->sta, indicate_tim);
788                 local->tim_in_locked_section = false;
789         }
790 
791 out_unlock:
792         spin_unlock_bh(&local->tim_lock);
793 }
794 
795 void sta_info_recalc_tim(struct sta_info *sta)
796 {
797         __sta_info_recalc_tim(sta, false);
798 }
799 
800 static bool sta_info_buffer_expired(struct sta_info *sta, struct sk_buff *skb)
801 {
802         struct ieee80211_tx_info *info;
803         int timeout;
804 
805         if (!skb)
806                 return false;
807 
808         info = IEEE80211_SKB_CB(skb);
809 
810         /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
811         timeout = (sta->listen_interval *
812                    sta->sdata->vif.bss_conf.beacon_int *
813                    32 / 15625) * HZ;
814         if (timeout < STA_TX_BUFFER_EXPIRE)
815                 timeout = STA_TX_BUFFER_EXPIRE;
816         return time_after(jiffies, info->control.jiffies + timeout);
817 }
818 
819 
820 static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local *local,
821                                                 struct sta_info *sta, int ac)
822 {
823         unsigned long flags;
824         struct sk_buff *skb;
825 
826         /*
827          * First check for frames that should expire on the filtered
828          * queue. Frames here were rejected by the driver and are on
829          * a separate queue to avoid reordering with normal PS-buffered
830          * frames. They also aren't accounted for right now in the
831          * total_ps_buffered counter.
832          */
833         for (;;) {
834                 spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
835                 skb = skb_peek(&sta->tx_filtered[ac]);
836                 if (sta_info_buffer_expired(sta, skb))
837                         skb = __skb_dequeue(&sta->tx_filtered[ac]);
838                 else
839                         skb = NULL;
840                 spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
841 
842                 /*
843                  * Frames are queued in order, so if this one
844                  * hasn't expired yet we can stop testing. If
845                  * we actually reached the end of the queue we
846                  * also need to stop, of course.
847                  */
848                 if (!skb)
849                         break;
850                 ieee80211_free_txskb(&local->hw, skb);
851         }
852 
853         /*
854          * Now also check the normal PS-buffered queue, this will
855          * only find something if the filtered queue was emptied
856          * since the filtered frames are all before the normal PS
857          * buffered frames.
858          */
859         for (;;) {
860                 spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
861                 skb = skb_peek(&sta->ps_tx_buf[ac]);
862                 if (sta_info_buffer_expired(sta, skb))
863                         skb = __skb_dequeue(&sta->ps_tx_buf[ac]);
864                 else
865                         skb = NULL;
866                 spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
867 
868                 /*
869                  * frames are queued in order, so if this one
870                  * hasn't expired yet (or we reached the end of
871                  * the queue) we can stop testing
872                  */
873                 if (!skb)
874                         break;
875 
876                 local->total_ps_buffered--;
877                 ps_dbg(sta->sdata, "Buffered frame expired (STA %pM)\n",
878                        sta->sta.addr);
879                 ieee80211_free_txskb(&local->hw, skb);
880         }
881 
882         /*
883          * Finally, recalculate the TIM bit for this station -- it might
884          * now be clear because the station was too slow to retrieve its
885          * frames.
886          */
887         sta_info_recalc_tim(sta);
888 
889         /*
890          * Return whether there are any frames still buffered, this is
891          * used to check whether the cleanup timer still needs to run,
892          * if there are no frames we don't need to rearm the timer.
893          */
894         return !(skb_queue_empty(&sta->ps_tx_buf[ac]) &&
895                  skb_queue_empty(&sta->tx_filtered[ac]));
896 }
897 
898 static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
899                                              struct sta_info *sta)
900 {
901         bool have_buffered = false;
902         int ac;
903 
904         /* This is only necessary for stations on BSS/MBSS interfaces */
905         if (!sta->sdata->bss &&
906             !ieee80211_vif_is_mesh(&sta->sdata->vif))
907                 return false;
908 
909         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
910                 have_buffered |=
911                         sta_info_cleanup_expire_buffered_ac(local, sta, ac);
912 
913         return have_buffered;
914 }
915 
916 static int __must_check __sta_info_destroy_part1(struct sta_info *sta)
917 {
918         struct ieee80211_local *local;
919         struct ieee80211_sub_if_data *sdata;
920         int ret;
921 
922         might_sleep();
923 
924         if (!sta)
925                 return -ENOENT;
926 
927         local = sta->local;
928         sdata = sta->sdata;
929 
930         lockdep_assert_held(&local->sta_mtx);
931 
932         /*
933          * Before removing the station from the driver and
934          * rate control, it might still start new aggregation
935          * sessions -- block that to make sure the tear-down
936          * will be sufficient.
937          */
938         set_sta_flag(sta, WLAN_STA_BLOCK_BA);
939         ieee80211_sta_tear_down_BA_sessions(sta, AGG_STOP_DESTROY_STA);
940 
941         /*
942          * Before removing the station from the driver there might be pending
943          * rx frames on RSS queues sent prior to the disassociation - wait for
944          * all such frames to be processed.
945          */
946         drv_sync_rx_queues(local, sta);
947 
948         ret = sta_info_hash_del(local, sta);
949         if (WARN_ON(ret))
950                 return ret;
951 
952         /*
953          * for TDLS peers, make sure to return to the base channel before
954          * removal.
955          */
956         if (test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) {
957                 drv_tdls_cancel_channel_switch(local, sdata, &sta->sta);
958                 clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
959         }
960 
961         list_del_rcu(&sta->list);
962         sta->removed = true;
963 
964         drv_sta_pre_rcu_remove(local, sta->sdata, sta);
965 
966         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
967             rcu_access_pointer(sdata->u.vlan.sta) == sta)
968                 RCU_INIT_POINTER(sdata->u.vlan.sta, NULL);
969 
970         return 0;
971 }
972 
973 static void __sta_info_destroy_part2(struct sta_info *sta)
974 {
975         struct ieee80211_local *local = sta->local;
976         struct ieee80211_sub_if_data *sdata = sta->sdata;
977         struct station_info *sinfo;
978         int ret;
979 
980         /*
981          * NOTE: This assumes at least synchronize_net() was done
982          *       after _part1 and before _part2!
983          */
984 
985         might_sleep();
986         lockdep_assert_held(&local->sta_mtx);
987 
988         /* now keys can no longer be reached */
989         ieee80211_free_sta_keys(local, sta);
990 
991         /* disable TIM bit - last chance to tell driver */
992         __sta_info_recalc_tim(sta, true);
993 
994         sta->dead = true;
995 
996         local->num_sta--;
997         local->sta_generation++;
998 
999         while (sta->sta_state > IEEE80211_STA_NONE) {
1000                 ret = sta_info_move_state(sta, sta->sta_state - 1);
1001                 if (ret) {
1002                         WARN_ON_ONCE(1);
1003                         break;
1004                 }
1005         }
1006 
1007         if (sta->uploaded) {
1008                 ret = drv_sta_state(local, sdata, sta, IEEE80211_STA_NONE,
1009                                     IEEE80211_STA_NOTEXIST);
1010                 WARN_ON_ONCE(ret != 0);
1011         }
1012 
1013         sta_dbg(sdata, "Removed STA %pM\n", sta->sta.addr);
1014 
1015         sinfo = kzalloc(sizeof(*sinfo), GFP_KERNEL);
1016         if (sinfo)
1017                 sta_set_sinfo(sta, sinfo, true);
1018         cfg80211_del_sta_sinfo(sdata->dev, sta->sta.addr, sinfo, GFP_KERNEL);
1019         kfree(sinfo);
1020 
1021         rate_control_remove_sta_debugfs(sta);
1022         ieee80211_sta_debugfs_remove(sta);
1023 
1024         cleanup_single_sta(sta);
1025 }
1026 
1027 int __must_check __sta_info_destroy(struct sta_info *sta)
1028 {
1029         int err = __sta_info_destroy_part1(sta);
1030 
1031         if (err)
1032                 return err;
1033 
1034         synchronize_net();
1035 
1036         __sta_info_destroy_part2(sta);
1037 
1038         return 0;
1039 }
1040 
1041 int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr)
1042 {
1043         struct sta_info *sta;
1044         int ret;
1045 
1046         mutex_lock(&sdata->local->sta_mtx);
1047         sta = sta_info_get(sdata, addr);
1048         ret = __sta_info_destroy(sta);
1049         mutex_unlock(&sdata->local->sta_mtx);
1050 
1051         return ret;
1052 }
1053 
1054 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
1055                               const u8 *addr)
1056 {
1057         struct sta_info *sta;
1058         int ret;
1059 
1060         mutex_lock(&sdata->local->sta_mtx);
1061         sta = sta_info_get_bss(sdata, addr);
1062         ret = __sta_info_destroy(sta);
1063         mutex_unlock(&sdata->local->sta_mtx);
1064 
1065         return ret;
1066 }
1067 
1068 static void sta_info_cleanup(struct timer_list *t)
1069 {
1070         struct ieee80211_local *local = from_timer(local, t, sta_cleanup);
1071         struct sta_info *sta;
1072         bool timer_needed = false;
1073 
1074         rcu_read_lock();
1075         list_for_each_entry_rcu(sta, &local->sta_list, list)
1076                 if (sta_info_cleanup_expire_buffered(local, sta))
1077                         timer_needed = true;
1078         rcu_read_unlock();
1079 
1080         if (local->quiescing)
1081                 return;
1082 
1083         if (!timer_needed)
1084                 return;
1085 
1086         mod_timer(&local->sta_cleanup,
1087                   round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL));
1088 }
1089 
1090 int sta_info_init(struct ieee80211_local *local)
1091 {
1092         int err;
1093 
1094         err = rhltable_init(&local->sta_hash, &sta_rht_params);
1095         if (err)
1096                 return err;
1097 
1098         spin_lock_init(&local->tim_lock);
1099         mutex_init(&local->sta_mtx);
1100         INIT_LIST_HEAD(&local->sta_list);
1101 
1102         timer_setup(&local->sta_cleanup, sta_info_cleanup, 0);
1103         return 0;
1104 }
1105 
1106 void sta_info_stop(struct ieee80211_local *local)
1107 {
1108         del_timer_sync(&local->sta_cleanup);
1109         rhltable_destroy(&local->sta_hash);
1110 }
1111 
1112 
1113 int __sta_info_flush(struct ieee80211_sub_if_data *sdata, bool vlans)
1114 {
1115         struct ieee80211_local *local = sdata->local;
1116         struct sta_info *sta, *tmp;
1117         LIST_HEAD(free_list);
1118         int ret = 0;
1119 
1120         might_sleep();
1121 
1122         WARN_ON(vlans && sdata->vif.type != NL80211_IFTYPE_AP);
1123         WARN_ON(vlans && !sdata->bss);
1124 
1125         mutex_lock(&local->sta_mtx);
1126         list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1127                 if (sdata == sta->sdata ||
1128                     (vlans && sdata->bss == sta->sdata->bss)) {
1129                         if (!WARN_ON(__sta_info_destroy_part1(sta)))
1130                                 list_add(&sta->free_list, &free_list);
1131                         ret++;
1132                 }
1133         }
1134 
1135         if (!list_empty(&free_list)) {
1136                 synchronize_net();
1137                 list_for_each_entry_safe(sta, tmp, &free_list, free_list)
1138                         __sta_info_destroy_part2(sta);
1139         }
1140         mutex_unlock(&local->sta_mtx);
1141 
1142         return ret;
1143 }
1144 
1145 void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
1146                           unsigned long exp_time)
1147 {
1148         struct ieee80211_local *local = sdata->local;
1149         struct sta_info *sta, *tmp;
1150 
1151         mutex_lock(&local->sta_mtx);
1152 
1153         list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1154                 unsigned long last_active = ieee80211_sta_last_active(sta);
1155 
1156                 if (sdata != sta->sdata)
1157                         continue;
1158 
1159                 if (time_is_before_jiffies(last_active + exp_time)) {
1160                         sta_dbg(sta->sdata, "expiring inactive STA %pM\n",
1161                                 sta->sta.addr);
1162 
1163                         if (ieee80211_vif_is_mesh(&sdata->vif) &&
1164                             test_sta_flag(sta, WLAN_STA_PS_STA))
1165                                 atomic_dec(&sdata->u.mesh.ps.num_sta_ps);
1166 
1167                         WARN_ON(__sta_info_destroy(sta));
1168                 }
1169         }
1170 
1171         mutex_unlock(&local->sta_mtx);
1172 }
1173 
1174 struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw,
1175                                                    const u8 *addr,
1176                                                    const u8 *localaddr)
1177 {
1178         struct ieee80211_local *local = hw_to_local(hw);
1179         struct rhlist_head *tmp;
1180         struct sta_info *sta;
1181 
1182         /*
1183          * Just return a random station if localaddr is NULL
1184          * ... first in list.
1185          */
1186         for_each_sta_info(local, addr, sta, tmp) {
1187                 if (localaddr &&
1188                     !ether_addr_equal(sta->sdata->vif.addr, localaddr))
1189                         continue;
1190                 if (!sta->uploaded)
1191                         return NULL;
1192                 return &sta->sta;
1193         }
1194 
1195         return NULL;
1196 }
1197 EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr);
1198 
1199 struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif,
1200                                          const u8 *addr)
1201 {
1202         struct sta_info *sta;
1203 
1204         if (!vif)
1205                 return NULL;
1206 
1207         sta = sta_info_get_bss(vif_to_sdata(vif), addr);
1208         if (!sta)
1209                 return NULL;
1210 
1211         if (!sta->uploaded)
1212                 return NULL;
1213 
1214         return &sta->sta;
1215 }
1216 EXPORT_SYMBOL(ieee80211_find_sta);
1217 
1218 /* powersave support code */
1219 void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta)
1220 {
1221         struct ieee80211_sub_if_data *sdata = sta->sdata;
1222         struct ieee80211_local *local = sdata->local;
1223         struct sk_buff_head pending;
1224         int filtered = 0, buffered = 0, ac, i;
1225         unsigned long flags;
1226         struct ps_data *ps;
1227 
1228         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1229                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
1230                                      u.ap);
1231 
1232         if (sdata->vif.type == NL80211_IFTYPE_AP)
1233                 ps = &sdata->bss->ps;
1234         else if (ieee80211_vif_is_mesh(&sdata->vif))
1235                 ps = &sdata->u.mesh.ps;
1236         else
1237                 return;
1238 
1239         clear_sta_flag(sta, WLAN_STA_SP);
1240 
1241         BUILD_BUG_ON(BITS_TO_LONGS(IEEE80211_NUM_TIDS) > 1);
1242         sta->driver_buffered_tids = 0;
1243         sta->txq_buffered_tids = 0;
1244 
1245         if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1246                 drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta);
1247 
1248         for (i = 0; i < ARRAY_SIZE(sta->sta.txq); i++) {
1249                 if (!sta->sta.txq[i] || !txq_has_queue(sta->sta.txq[i]))
1250                         continue;
1251 
1252                 schedule_and_wake_txq(local, to_txq_info(sta->sta.txq[i]));
1253         }
1254 
1255         skb_queue_head_init(&pending);
1256 
1257         /* sync with ieee80211_tx_h_unicast_ps_buf */
1258         spin_lock(&sta->ps_lock);
1259         /* Send all buffered frames to the station */
1260         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1261                 int count = skb_queue_len(&pending), tmp;
1262 
1263                 spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
1264                 skb_queue_splice_tail_init(&sta->tx_filtered[ac], &pending);
1265                 spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
1266                 tmp = skb_queue_len(&pending);
1267                 filtered += tmp - count;
1268                 count = tmp;
1269 
1270                 spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
1271                 skb_queue_splice_tail_init(&sta->ps_tx_buf[ac], &pending);
1272                 spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
1273                 tmp = skb_queue_len(&pending);
1274                 buffered += tmp - count;
1275         }
1276 
1277         ieee80211_add_pending_skbs(local, &pending);
1278 
1279         /* now we're no longer in the deliver code */
1280         clear_sta_flag(sta, WLAN_STA_PS_DELIVER);
1281 
1282         /* The station might have polled and then woken up before we responded,
1283          * so clear these flags now to avoid them sticking around.
1284          */
1285         clear_sta_flag(sta, WLAN_STA_PSPOLL);
1286         clear_sta_flag(sta, WLAN_STA_UAPSD);
1287         spin_unlock(&sta->ps_lock);
1288 
1289         atomic_dec(&ps->num_sta_ps);
1290 
1291         /* This station just woke up and isn't aware of our SMPS state */
1292         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
1293             !ieee80211_smps_is_restrictive(sta->known_smps_mode,
1294                                            sdata->smps_mode) &&
1295             sta->known_smps_mode != sdata->bss->req_smps &&
1296             sta_info_tx_streams(sta) != 1) {
1297                 ht_dbg(sdata,
1298                        "%pM just woke up and MIMO capable - update SMPS\n",
1299                        sta->sta.addr);
1300                 ieee80211_send_smps_action(sdata, sdata->bss->req_smps,
1301                                            sta->sta.addr,
1302                                            sdata->vif.bss_conf.bssid);
1303         }
1304 
1305         local->total_ps_buffered -= buffered;
1306 
1307         sta_info_recalc_tim(sta);
1308 
1309         ps_dbg(sdata,
1310                "STA %pM aid %d sending %d filtered/%d PS frames since STA woke up\n",
1311                sta->sta.addr, sta->sta.aid, filtered, buffered);
1312 
1313         ieee80211_check_fast_xmit(sta);
1314 }
1315 
1316 static void ieee80211_send_null_response(struct sta_info *sta, int tid,
1317                                          enum ieee80211_frame_release_type reason,
1318                                          bool call_driver, bool more_data)
1319 {
1320         struct ieee80211_sub_if_data *sdata = sta->sdata;
1321         struct ieee80211_local *local = sdata->local;
1322         struct ieee80211_qos_hdr *nullfunc;
1323         struct sk_buff *skb;
1324         int size = sizeof(*nullfunc);
1325         __le16 fc;
1326         bool qos = sta->sta.wme;
1327         struct ieee80211_tx_info *info;
1328         struct ieee80211_chanctx_conf *chanctx_conf;
1329 
1330         /* Don't send NDPs when STA is connected HE */
1331         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1332             !(sdata->u.mgd.flags & IEEE80211_STA_DISABLE_HE))
1333                 return;
1334 
1335         if (qos) {
1336                 fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1337                                  IEEE80211_STYPE_QOS_NULLFUNC |
1338                                  IEEE80211_FCTL_FROMDS);
1339         } else {
1340                 size -= 2;
1341                 fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1342                                  IEEE80211_STYPE_NULLFUNC |
1343                                  IEEE80211_FCTL_FROMDS);
1344         }
1345 
1346         skb = dev_alloc_skb(local->hw.extra_tx_headroom + size);
1347         if (!skb)
1348                 return;
1349 
1350         skb_reserve(skb, local->hw.extra_tx_headroom);
1351 
1352         nullfunc = skb_put(skb, size);
1353         nullfunc->frame_control = fc;
1354         nullfunc->duration_id = 0;
1355         memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN);
1356         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
1357         memcpy(nullfunc->addr3, sdata->vif.addr, ETH_ALEN);
1358         nullfunc->seq_ctrl = 0;
1359 
1360         skb->priority = tid;
1361         skb_set_queue_mapping(skb, ieee802_1d_to_ac[tid]);
1362         if (qos) {
1363                 nullfunc->qos_ctrl = cpu_to_le16(tid);
1364 
1365                 if (reason == IEEE80211_FRAME_RELEASE_UAPSD) {
1366                         nullfunc->qos_ctrl |=
1367                                 cpu_to_le16(IEEE80211_QOS_CTL_EOSP);
1368                         if (more_data)
1369                                 nullfunc->frame_control |=
1370                                         cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1371                 }
1372         }
1373 
1374         info = IEEE80211_SKB_CB(skb);
1375 
1376         /*
1377          * Tell TX path to send this frame even though the
1378          * STA may still remain is PS mode after this frame
1379          * exchange. Also set EOSP to indicate this packet
1380          * ends the poll/service period.
1381          */
1382         info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER |
1383                        IEEE80211_TX_STATUS_EOSP |
1384                        IEEE80211_TX_CTL_REQ_TX_STATUS;
1385 
1386         info->control.flags |= IEEE80211_TX_CTRL_PS_RESPONSE;
1387 
1388         if (call_driver)
1389                 drv_allow_buffered_frames(local, sta, BIT(tid), 1,
1390                                           reason, false);
1391 
1392         skb->dev = sdata->dev;
1393 
1394         rcu_read_lock();
1395         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1396         if (WARN_ON(!chanctx_conf)) {
1397                 rcu_read_unlock();
1398                 kfree_skb(skb);
1399                 return;
1400         }
1401 
1402         info->band = chanctx_conf->def.chan->band;
1403         ieee80211_xmit(sdata, sta, skb, 0);
1404         rcu_read_unlock();
1405 }
1406 
1407 static int find_highest_prio_tid(unsigned long tids)
1408 {
1409         /* lower 3 TIDs aren't ordered perfectly */
1410         if (tids & 0xF8)
1411                 return fls(tids) - 1;
1412         /* TID 0 is BE just like TID 3 */
1413         if (tids & BIT(0))
1414                 return 0;
1415         return fls(tids) - 1;
1416 }
1417 
1418 /* Indicates if the MORE_DATA bit should be set in the last
1419  * frame obtained by ieee80211_sta_ps_get_frames.
1420  * Note that driver_release_tids is relevant only if
1421  * reason = IEEE80211_FRAME_RELEASE_PSPOLL
1422  */
1423 static bool
1424 ieee80211_sta_ps_more_data(struct sta_info *sta, u8 ignored_acs,
1425                            enum ieee80211_frame_release_type reason,
1426                            unsigned long driver_release_tids)
1427 {
1428         int ac;
1429 
1430         /* If the driver has data on more than one TID then
1431          * certainly there's more data if we release just a
1432          * single frame now (from a single TID). This will
1433          * only happen for PS-Poll.
1434          */
1435         if (reason == IEEE80211_FRAME_RELEASE_PSPOLL &&
1436             hweight16(driver_release_tids) > 1)
1437                 return true;
1438 
1439         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1440                 if (ignored_acs & ieee80211_ac_to_qos_mask[ac])
1441                         continue;
1442 
1443                 if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
1444                     !skb_queue_empty(&sta->ps_tx_buf[ac]))
1445                         return true;
1446         }
1447 
1448         return false;
1449 }
1450 
1451 static void
1452 ieee80211_sta_ps_get_frames(struct sta_info *sta, int n_frames, u8 ignored_acs,
1453                             enum ieee80211_frame_release_type reason,
1454                             struct sk_buff_head *frames,
1455                             unsigned long *driver_release_tids)
1456 {
1457         struct ieee80211_sub_if_data *sdata = sta->sdata;
1458         struct ieee80211_local *local = sdata->local;
1459         int ac;
1460 
1461         /* Get response frame(s) and more data bit for the last one. */
1462         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1463                 unsigned long tids;
1464 
1465                 if (ignored_acs & ieee80211_ac_to_qos_mask[ac])
1466                         continue;
1467 
1468                 tids = ieee80211_tids_for_ac(ac);
1469 
1470                 /* if we already have frames from software, then we can't also
1471                  * release from hardware queues
1472                  */
1473                 if (skb_queue_empty(frames)) {
1474                         *driver_release_tids |=
1475                                 sta->driver_buffered_tids & tids;
1476                         *driver_release_tids |= sta->txq_buffered_tids & tids;
1477                 }
1478 
1479                 if (!*driver_release_tids) {
1480                         struct sk_buff *skb;
1481 
1482                         while (n_frames > 0) {
1483                                 skb = skb_dequeue(&sta->tx_filtered[ac]);
1484                                 if (!skb) {
1485                                         skb = skb_dequeue(
1486                                                 &sta->ps_tx_buf[ac]);
1487                                         if (skb)
1488                                                 local->total_ps_buffered--;
1489                                 }
1490                                 if (!skb)
1491                                         break;
1492                                 n_frames--;
1493                                 __skb_queue_tail(frames, skb);
1494                         }
1495                 }
1496 
1497                 /* If we have more frames buffered on this AC, then abort the
1498                  * loop since we can't send more data from other ACs before
1499                  * the buffered frames from this.
1500                  */
1501                 if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
1502                     !skb_queue_empty(&sta->ps_tx_buf[ac]))
1503                         break;
1504         }
1505 }
1506 
1507 static void
1508 ieee80211_sta_ps_deliver_response(struct sta_info *sta,
1509                                   int n_frames, u8 ignored_acs,
1510                                   enum ieee80211_frame_release_type reason)
1511 {
1512         struct ieee80211_sub_if_data *sdata = sta->sdata;
1513         struct ieee80211_local *local = sdata->local;
1514         unsigned long driver_release_tids = 0;
1515         struct sk_buff_head frames;
1516         bool more_data;
1517 
1518         /* Service or PS-Poll period starts */
1519         set_sta_flag(sta, WLAN_STA_SP);
1520 
1521         __skb_queue_head_init(&frames);
1522 
1523         ieee80211_sta_ps_get_frames(sta, n_frames, ignored_acs, reason,
1524                                     &frames, &driver_release_tids);
1525 
1526         more_data = ieee80211_sta_ps_more_data(sta, ignored_acs, reason, driver_release_tids);
1527 
1528         if (driver_release_tids && reason == IEEE80211_FRAME_RELEASE_PSPOLL)
1529                 driver_release_tids =
1530                         BIT(find_highest_prio_tid(driver_release_tids));
1531 
1532         if (skb_queue_empty(&frames) && !driver_release_tids) {
1533                 int tid, ac;
1534 
1535                 /*
1536                  * For PS-Poll, this can only happen due to a race condition
1537                  * when we set the TIM bit and the station notices it, but
1538                  * before it can poll for the frame we expire it.
1539                  *
1540                  * For uAPSD, this is said in the standard (11.2.1.5 h):
1541                  *      At each unscheduled SP for a non-AP STA, the AP shall
1542                  *      attempt to transmit at least one MSDU or MMPDU, but no
1543                  *      more than the value specified in the Max SP Length field
1544                  *      in the QoS Capability element from delivery-enabled ACs,
1545                  *      that are destined for the non-AP STA.
1546                  *
1547                  * Since we have no other MSDU/MMPDU, transmit a QoS null frame.
1548                  */
1549 
1550                 /* This will evaluate to 1, 3, 5 or 7. */
1551                 for (ac = IEEE80211_AC_VO; ac < IEEE80211_NUM_ACS; ac++)
1552                         if (!(ignored_acs & ieee80211_ac_to_qos_mask[ac]))
1553                                 break;
1554                 tid = 7 - 2 * ac;
1555 
1556                 ieee80211_send_null_response(sta, tid, reason, true, false);
1557         } else if (!driver_release_tids) {
1558                 struct sk_buff_head pending;
1559                 struct sk_buff *skb;
1560                 int num = 0;
1561                 u16 tids = 0;
1562                 bool need_null = false;
1563 
1564                 skb_queue_head_init(&pending);
1565 
1566                 while ((skb = __skb_dequeue(&frames))) {
1567                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1568                         struct ieee80211_hdr *hdr = (void *) skb->data;
1569                         u8 *qoshdr = NULL;
1570 
1571                         num++;
1572 
1573                         /*
1574                          * Tell TX path to send this frame even though the
1575                          * STA may still remain is PS mode after this frame
1576                          * exchange.
1577                          */
1578                         info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
1579                         info->control.flags |= IEEE80211_TX_CTRL_PS_RESPONSE;
1580 
1581                         /*
1582                          * Use MoreData flag to indicate whether there are
1583                          * more buffered frames for this STA
1584                          */
1585                         if (more_data || !skb_queue_empty(&frames))
1586                                 hdr->frame_control |=
1587                                         cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1588                         else
1589                                 hdr->frame_control &=
1590                                         cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
1591 
1592                         if (ieee80211_is_data_qos(hdr->frame_control) ||
1593                             ieee80211_is_qos_nullfunc(hdr->frame_control))
1594                                 qoshdr = ieee80211_get_qos_ctl(hdr);
1595 
1596                         tids |= BIT(skb->priority);
1597 
1598                         __skb_queue_tail(&pending, skb);
1599 
1600                         /* end service period after last frame or add one */
1601                         if (!skb_queue_empty(&frames))
1602                                 continue;
1603 
1604                         if (reason != IEEE80211_FRAME_RELEASE_UAPSD) {
1605                                 /* for PS-Poll, there's only one frame */
1606                                 info->flags |= IEEE80211_TX_STATUS_EOSP |
1607                                                IEEE80211_TX_CTL_REQ_TX_STATUS;
1608                                 break;
1609                         }
1610 
1611                         /* For uAPSD, things are a bit more complicated. If the
1612                          * last frame has a QoS header (i.e. is a QoS-data or
1613                          * QoS-nulldata frame) then just set the EOSP bit there
1614                          * and be done.
1615                          * If the frame doesn't have a QoS header (which means
1616                          * it should be a bufferable MMPDU) then we can't set
1617                          * the EOSP bit in the QoS header; add a QoS-nulldata
1618                          * frame to the list to send it after the MMPDU.
1619                          *
1620                          * Note that this code is only in the mac80211-release
1621                          * code path, we assume that the driver will not buffer
1622                          * anything but QoS-data frames, or if it does, will
1623                          * create the QoS-nulldata frame by itself if needed.
1624                          *
1625                          * Cf. 802.11-2012 10.2.1.10 (c).
1626                          */
1627                         if (qoshdr) {
1628                                 *qoshdr |= IEEE80211_QOS_CTL_EOSP;
1629 
1630                                 info->flags |= IEEE80211_TX_STATUS_EOSP |
1631                                                IEEE80211_TX_CTL_REQ_TX_STATUS;
1632                         } else {
1633                                 /* The standard isn't completely clear on this
1634                                  * as it says the more-data bit should be set
1635                                  * if there are more BUs. The QoS-Null frame
1636                                  * we're about to send isn't buffered yet, we
1637                                  * only create it below, but let's pretend it
1638                                  * was buffered just in case some clients only
1639                                  * expect more-data=0 when eosp=1.
1640                                  */
1641                                 hdr->frame_control |=
1642                                         cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1643                                 need_null = true;
1644                                 num++;
1645                         }
1646                         break;
1647                 }
1648 
1649                 drv_allow_buffered_frames(local, sta, tids, num,
1650                                           reason, more_data);
1651 
1652                 ieee80211_add_pending_skbs(local, &pending);
1653 
1654                 if (need_null)
1655                         ieee80211_send_null_response(
1656                                 sta, find_highest_prio_tid(tids),
1657                                 reason, false, false);
1658 
1659                 sta_info_recalc_tim(sta);
1660         } else {
1661                 int tid;
1662 
1663                 /*
1664                  * We need to release a frame that is buffered somewhere in the
1665                  * driver ... it'll have to handle that.
1666                  * Note that the driver also has to check the number of frames
1667                  * on the TIDs we're releasing from - if there are more than
1668                  * n_frames it has to set the more-data bit (if we didn't ask
1669                  * it to set it anyway due to other buffered frames); if there
1670                  * are fewer than n_frames it has to make sure to adjust that
1671                  * to allow the service period to end properly.
1672                  */
1673                 drv_release_buffered_frames(local, sta, driver_release_tids,
1674                                             n_frames, reason, more_data);
1675 
1676                 /*
1677                  * Note that we don't recalculate the TIM bit here as it would
1678                  * most likely have no effect at all unless the driver told us
1679                  * that the TID(s) became empty before returning here from the
1680                  * release function.
1681                  * Either way, however, when the driver tells us that the TID(s)
1682                  * became empty or we find that a txq became empty, we'll do the
1683                  * TIM recalculation.
1684                  */
1685 
1686                 if (!sta->sta.txq[0])
1687                         return;
1688 
1689                 for (tid = 0; tid < ARRAY_SIZE(sta->sta.txq); tid++) {
1690                         if (!sta->sta.txq[tid] ||
1691                             !(driver_release_tids & BIT(tid)) ||
1692                             txq_has_queue(sta->sta.txq[tid]))
1693                                 continue;
1694 
1695                         sta_info_recalc_tim(sta);
1696                         break;
1697                 }
1698         }
1699 }
1700 
1701 void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta)
1702 {
1703         u8 ignore_for_response = sta->sta.uapsd_queues;
1704 
1705         /*
1706          * If all ACs are delivery-enabled then we should reply
1707          * from any of them, if only some are enabled we reply
1708          * only from the non-enabled ones.
1709          */
1710         if (ignore_for_response == BIT(IEEE80211_NUM_ACS) - 1)
1711                 ignore_for_response = 0;
1712 
1713         ieee80211_sta_ps_deliver_response(sta, 1, ignore_for_response,
1714                                           IEEE80211_FRAME_RELEASE_PSPOLL);
1715 }
1716 
1717 void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta)
1718 {
1719         int n_frames = sta->sta.max_sp;
1720         u8 delivery_enabled = sta->sta.uapsd_queues;
1721 
1722         /*
1723          * If we ever grow support for TSPEC this might happen if
1724          * the TSPEC update from hostapd comes in between a trigger
1725          * frame setting WLAN_STA_UAPSD in the RX path and this
1726          * actually getting called.
1727          */
1728         if (!delivery_enabled)
1729                 return;
1730 
1731         switch (sta->sta.max_sp) {
1732         case 1:
1733                 n_frames = 2;
1734                 break;
1735         case 2:
1736                 n_frames = 4;
1737                 break;
1738         case 3:
1739                 n_frames = 6;
1740                 break;
1741         case 0:
1742                 /* XXX: what is a good value? */
1743                 n_frames = 128;
1744                 break;
1745         }
1746 
1747         ieee80211_sta_ps_deliver_response(sta, n_frames, ~delivery_enabled,
1748                                           IEEE80211_FRAME_RELEASE_UAPSD);
1749 }
1750 
1751 void ieee80211_sta_block_awake(struct ieee80211_hw *hw,
1752                                struct ieee80211_sta *pubsta, bool block)
1753 {
1754         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1755 
1756         trace_api_sta_block_awake(sta->local, pubsta, block);
1757 
1758         if (block) {
1759                 set_sta_flag(sta, WLAN_STA_PS_DRIVER);
1760                 ieee80211_clear_fast_xmit(sta);
1761                 return;
1762         }
1763 
1764         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1765                 return;
1766 
1767         if (!test_sta_flag(sta, WLAN_STA_PS_STA)) {
1768                 set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1769                 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
1770                 ieee80211_queue_work(hw, &sta->drv_deliver_wk);
1771         } else if (test_sta_flag(sta, WLAN_STA_PSPOLL) ||
1772                    test_sta_flag(sta, WLAN_STA_UAPSD)) {
1773                 /* must be asleep in this case */
1774                 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
1775                 ieee80211_queue_work(hw, &sta->drv_deliver_wk);
1776         } else {
1777                 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
1778                 ieee80211_check_fast_xmit(sta);
1779         }
1780 }
1781 EXPORT_SYMBOL(ieee80211_sta_block_awake);
1782 
1783 void ieee80211_sta_eosp(struct ieee80211_sta *pubsta)
1784 {
1785         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1786         struct ieee80211_local *local = sta->local;
1787 
1788         trace_api_eosp(local, pubsta);
1789 
1790         clear_sta_flag(sta, WLAN_STA_SP);
1791 }
1792 EXPORT_SYMBOL(ieee80211_sta_eosp);
1793 
1794 void ieee80211_send_eosp_nullfunc(struct ieee80211_sta *pubsta, int tid)
1795 {
1796         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1797         enum ieee80211_frame_release_type reason;
1798         bool more_data;
1799 
1800         trace_api_send_eosp_nullfunc(sta->local, pubsta, tid);
1801 
1802         reason = IEEE80211_FRAME_RELEASE_UAPSD;
1803         more_data = ieee80211_sta_ps_more_data(sta, ~sta->sta.uapsd_queues,
1804                                                reason, 0);
1805 
1806         ieee80211_send_null_response(sta, tid, reason, false, more_data);
1807 }
1808 EXPORT_SYMBOL(ieee80211_send_eosp_nullfunc);
1809 
1810 void ieee80211_sta_set_buffered(struct ieee80211_sta *pubsta,
1811                                 u8 tid, bool buffered)
1812 {
1813         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1814 
1815         if (WARN_ON(tid >= IEEE80211_NUM_TIDS))
1816                 return;
1817 
1818         trace_api_sta_set_buffered(sta->local, pubsta, tid, buffered);
1819 
1820         if (buffered)
1821                 set_bit(tid, &sta->driver_buffered_tids);
1822         else
1823                 clear_bit(tid, &sta->driver_buffered_tids);
1824 
1825         sta_info_recalc_tim(sta);
1826 }
1827 EXPORT_SYMBOL(ieee80211_sta_set_buffered);
1828 
1829 void ieee80211_sta_register_airtime(struct ieee80211_sta *pubsta, u8 tid,
1830                                     u32 tx_airtime, u32 rx_airtime)
1831 {
1832         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1833         struct ieee80211_local *local = sta->sdata->local;
1834         u8 ac = ieee80211_ac_from_tid(tid);
1835         u32 airtime = 0;
1836 
1837         if (sta->local->airtime_flags & AIRTIME_USE_TX)
1838                 airtime += tx_airtime;
1839         if (sta->local->airtime_flags & AIRTIME_USE_RX)
1840                 airtime += rx_airtime;
1841 
1842         spin_lock_bh(&local->active_txq_lock[ac]);
1843         sta->airtime[ac].tx_airtime += tx_airtime;
1844         sta->airtime[ac].rx_airtime += rx_airtime;
1845         sta->airtime[ac].deficit -= airtime;
1846         spin_unlock_bh(&local->active_txq_lock[ac]);
1847 }
1848 EXPORT_SYMBOL(ieee80211_sta_register_airtime);
1849 
1850 int sta_info_move_state(struct sta_info *sta,
1851                         enum ieee80211_sta_state new_state)
1852 {
1853         might_sleep();
1854 
1855         if (sta->sta_state == new_state)
1856                 return 0;
1857 
1858         /* check allowed transitions first */
1859 
1860         switch (new_state) {
1861         case IEEE80211_STA_NONE:
1862                 if (sta->sta_state != IEEE80211_STA_AUTH)
1863                         return -EINVAL;
1864                 break;
1865         case IEEE80211_STA_AUTH:
1866                 if (sta->sta_state != IEEE80211_STA_NONE &&
1867                     sta->sta_state != IEEE80211_STA_ASSOC)
1868                         return -EINVAL;
1869                 break;
1870         case IEEE80211_STA_ASSOC:
1871                 if (sta->sta_state != IEEE80211_STA_AUTH &&
1872                     sta->sta_state != IEEE80211_STA_AUTHORIZED)
1873                         return -EINVAL;
1874                 break;
1875         case IEEE80211_STA_AUTHORIZED:
1876                 if (sta->sta_state != IEEE80211_STA_ASSOC)
1877                         return -EINVAL;
1878                 break;
1879         default:
1880                 WARN(1, "invalid state %d", new_state);
1881                 return -EINVAL;
1882         }
1883 
1884         sta_dbg(sta->sdata, "moving STA %pM to state %d\n",
1885                 sta->sta.addr, new_state);
1886 
1887         /*
1888          * notify the driver before the actual changes so it can
1889          * fail the transition
1890          */
1891         if (test_sta_flag(sta, WLAN_STA_INSERTED)) {
1892                 int err = drv_sta_state(sta->local, sta->sdata, sta,
1893                                         sta->sta_state, new_state);
1894                 if (err)
1895                         return err;
1896         }
1897 
1898         /* reflect the change in all state variables */
1899 
1900         switch (new_state) {
1901         case IEEE80211_STA_NONE:
1902                 if (sta->sta_state == IEEE80211_STA_AUTH)
1903                         clear_bit(WLAN_STA_AUTH, &sta->_flags);
1904                 break;
1905         case IEEE80211_STA_AUTH:
1906                 if (sta->sta_state == IEEE80211_STA_NONE) {
1907                         set_bit(WLAN_STA_AUTH, &sta->_flags);
1908                 } else if (sta->sta_state == IEEE80211_STA_ASSOC) {
1909                         clear_bit(WLAN_STA_ASSOC, &sta->_flags);
1910                         ieee80211_recalc_min_chandef(sta->sdata);
1911                         if (!sta->sta.support_p2p_ps)
1912                                 ieee80211_recalc_p2p_go_ps_allowed(sta->sdata);
1913                 }
1914                 break;
1915         case IEEE80211_STA_ASSOC:
1916                 if (sta->sta_state == IEEE80211_STA_AUTH) {
1917                         set_bit(WLAN_STA_ASSOC, &sta->_flags);
1918                         ieee80211_recalc_min_chandef(sta->sdata);
1919                         if (!sta->sta.support_p2p_ps)
1920                                 ieee80211_recalc_p2p_go_ps_allowed(sta->sdata);
1921                 } else if (sta->sta_state == IEEE80211_STA_AUTHORIZED) {
1922                         ieee80211_vif_dec_num_mcast(sta->sdata);
1923                         clear_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1924                         ieee80211_clear_fast_xmit(sta);
1925                         ieee80211_clear_fast_rx(sta);
1926                 }
1927                 break;
1928         case IEEE80211_STA_AUTHORIZED:
1929                 if (sta->sta_state == IEEE80211_STA_ASSOC) {
1930                         ieee80211_vif_inc_num_mcast(sta->sdata);
1931                         set_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1932                         ieee80211_check_fast_xmit(sta);
1933                         ieee80211_check_fast_rx(sta);
1934                 }
1935                 break;
1936         default:
1937                 break;
1938         }
1939 
1940         sta->sta_state = new_state;
1941 
1942         return 0;
1943 }
1944 
1945 u8 sta_info_tx_streams(struct sta_info *sta)
1946 {
1947         struct ieee80211_sta_ht_cap *ht_cap = &sta->sta.ht_cap;
1948         u8 rx_streams;
1949 
1950         if (!sta->sta.ht_cap.ht_supported)
1951                 return 1;
1952 
1953         if (sta->sta.vht_cap.vht_supported) {
1954                 int i;
1955                 u16 tx_mcs_map =
1956                         le16_to_cpu(sta->sta.vht_cap.vht_mcs.tx_mcs_map);
1957 
1958                 for (i = 7; i >= 0; i--)
1959                         if ((tx_mcs_map & (0x3 << (i * 2))) !=
1960                             IEEE80211_VHT_MCS_NOT_SUPPORTED)
1961                                 return i + 1;
1962         }
1963 
1964         if (ht_cap->mcs.rx_mask[3])
1965                 rx_streams = 4;
1966         else if (ht_cap->mcs.rx_mask[2])
1967                 rx_streams = 3;
1968         else if (ht_cap->mcs.rx_mask[1])
1969                 rx_streams = 2;
1970         else
1971                 rx_streams = 1;
1972 
1973         if (!(ht_cap->mcs.tx_params & IEEE80211_HT_MCS_TX_RX_DIFF))
1974                 return rx_streams;
1975 
1976         return ((ht_cap->mcs.tx_params & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
1977                         >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1;
1978 }
1979 
1980 static struct ieee80211_sta_rx_stats *
1981 sta_get_last_rx_stats(struct sta_info *sta)
1982 {
1983         struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;
1984         struct ieee80211_local *local = sta->local;
1985         int cpu;
1986 
1987         if (!ieee80211_hw_check(&local->hw, USES_RSS))
1988                 return stats;
1989 
1990         for_each_possible_cpu(cpu) {
1991                 struct ieee80211_sta_rx_stats *cpustats;
1992 
1993                 cpustats = per_cpu_ptr(sta->pcpu_rx_stats, cpu);
1994 
1995                 if (time_after(cpustats->last_rx, stats->last_rx))
1996                         stats = cpustats;
1997         }
1998 
1999         return stats;
2000 }
2001 
2002 static void sta_stats_decode_rate(struct ieee80211_local *local, u32 rate,
2003                                   struct rate_info *rinfo)
2004 {
2005         rinfo->bw = STA_STATS_GET(BW, rate);
2006 
2007         switch (STA_STATS_GET(TYPE, rate)) {
2008         case STA_STATS_RATE_TYPE_VHT:
2009                 rinfo->flags = RATE_INFO_FLAGS_VHT_MCS;
2010                 rinfo->mcs = STA_STATS_GET(VHT_MCS, rate);
2011                 rinfo->nss = STA_STATS_GET(VHT_NSS, rate);
2012                 if (STA_STATS_GET(SGI, rate))
2013                         rinfo->flags |= RATE_INFO_FLAGS_SHORT_GI;
2014                 break;
2015         case STA_STATS_RATE_TYPE_HT:
2016                 rinfo->flags = RATE_INFO_FLAGS_MCS;
2017                 rinfo->mcs = STA_STATS_GET(HT_MCS, rate);
2018                 if (STA_STATS_GET(SGI, rate))
2019                         rinfo->flags |= RATE_INFO_FLAGS_SHORT_GI;
2020                 break;
2021         case STA_STATS_RATE_TYPE_LEGACY: {
2022                 struct ieee80211_supported_band *sband;
2023                 u16 brate;
2024                 unsigned int shift;
2025                 int band = STA_STATS_GET(LEGACY_BAND, rate);
2026                 int rate_idx = STA_STATS_GET(LEGACY_IDX, rate);
2027 
2028                 sband = local->hw.wiphy->bands[band];
2029                 brate = sband->bitrates[rate_idx].bitrate;
2030                 if (rinfo->bw == RATE_INFO_BW_5)
2031                         shift = 2;
2032                 else if (rinfo->bw == RATE_INFO_BW_10)
2033                         shift = 1;
2034                 else
2035                         shift = 0;
2036                 rinfo->legacy = DIV_ROUND_UP(brate, 1 << shift);
2037                 break;
2038                 }
2039         case STA_STATS_RATE_TYPE_HE:
2040                 rinfo->flags = RATE_INFO_FLAGS_HE_MCS;
2041                 rinfo->mcs = STA_STATS_GET(HE_MCS, rate);
2042                 rinfo->nss = STA_STATS_GET(HE_NSS, rate);
2043                 rinfo->he_gi = STA_STATS_GET(HE_GI, rate);
2044                 rinfo->he_ru_alloc = STA_STATS_GET(HE_RU, rate);
2045                 rinfo->he_dcm = STA_STATS_GET(HE_DCM, rate);
2046                 break;
2047         }
2048 }
2049 
2050 static int sta_set_rate_info_rx(struct sta_info *sta, struct rate_info *rinfo)
2051 {
2052         u16 rate = READ_ONCE(sta_get_last_rx_stats(sta)->last_rate);
2053 
2054         if (rate == STA_STATS_RATE_INVALID)
2055                 return -EINVAL;
2056 
2057         sta_stats_decode_rate(sta->local, rate, rinfo);
2058         return 0;
2059 }
2060 
2061 static void sta_set_tidstats(struct sta_info *sta,
2062                              struct cfg80211_tid_stats *tidstats,
2063                              int tid)
2064 {
2065         struct ieee80211_local *local = sta->local;
2066 
2067         if (!(tidstats->filled & BIT(NL80211_TID_STATS_RX_MSDU))) {
2068                 unsigned int start;
2069 
2070                 do {
2071                         start = u64_stats_fetch_begin(&sta->rx_stats.syncp);
2072                         tidstats->rx_msdu = sta->rx_stats.msdu[tid];
2073                 } while (u64_stats_fetch_retry(&sta->rx_stats.syncp, start));
2074 
2075                 tidstats->filled |= BIT(NL80211_TID_STATS_RX_MSDU);
2076         }
2077 
2078         if (!(tidstats->filled & BIT(NL80211_TID_STATS_TX_MSDU))) {
2079                 tidstats->filled |= BIT(NL80211_TID_STATS_TX_MSDU);
2080                 tidstats->tx_msdu = sta->tx_stats.msdu[tid];
2081         }
2082 
2083         if (!(tidstats->filled & BIT(NL80211_TID_STATS_TX_MSDU_RETRIES)) &&
2084             ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
2085                 tidstats->filled |= BIT(NL80211_TID_STATS_TX_MSDU_RETRIES);
2086                 tidstats->tx_msdu_retries = sta->status_stats.msdu_retries[tid];
2087         }
2088 
2089         if (!(tidstats->filled & BIT(NL80211_TID_STATS_TX_MSDU_FAILED)) &&
2090             ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
2091                 tidstats->filled |= BIT(NL80211_TID_STATS_TX_MSDU_FAILED);
2092                 tidstats->tx_msdu_failed = sta->status_stats.msdu_failed[tid];
2093         }
2094 
2095         if (local->ops->wake_tx_queue && tid < IEEE80211_NUM_TIDS) {
2096                 spin_lock_bh(&local->fq.lock);
2097                 rcu_read_lock();
2098 
2099                 tidstats->filled |= BIT(NL80211_TID_STATS_TXQ_STATS);
2100                 ieee80211_fill_txq_stats(&tidstats->txq_stats,
2101                                          to_txq_info(sta->sta.txq[tid]));
2102 
2103                 rcu_read_unlock();
2104                 spin_unlock_bh(&local->fq.lock);
2105         }
2106 }
2107 
2108 static inline u64 sta_get_stats_bytes(struct ieee80211_sta_rx_stats *rxstats)
2109 {
2110         unsigned int start;
2111         u64 value;
2112 
2113         do {
2114                 start = u64_stats_fetch_begin(&rxstats->syncp);
2115                 value = rxstats->bytes;
2116         } while (u64_stats_fetch_retry(&rxstats->syncp, start));
2117 
2118         return value;
2119 }
2120 
2121 void sta_set_sinfo(struct sta_info *sta, struct station_info *sinfo,
2122                    bool tidstats)
2123 {
2124         struct ieee80211_sub_if_data *sdata = sta->sdata;
2125         struct ieee80211_local *local = sdata->local;
2126         u32 thr = 0;
2127         int i, ac, cpu;
2128         struct ieee80211_sta_rx_stats *last_rxstats;
2129 
2130         last_rxstats = sta_get_last_rx_stats(sta);
2131 
2132         sinfo->generation = sdata->local->sta_generation;
2133 
2134         /* do before driver, so beacon filtering drivers have a
2135          * chance to e.g. just add the number of filtered beacons
2136          * (or just modify the value entirely, of course)
2137          */
2138         if (sdata->vif.type == NL80211_IFTYPE_STATION)
2139                 sinfo->rx_beacon = sdata->u.mgd.count_beacon_signal;
2140 
2141         drv_sta_statistics(local, sdata, &sta->sta, sinfo);
2142 
2143         sinfo->filled |= BIT_ULL(NL80211_STA_INFO_INACTIVE_TIME) |
2144                          BIT_ULL(NL80211_STA_INFO_STA_FLAGS) |
2145                          BIT_ULL(NL80211_STA_INFO_BSS_PARAM) |
2146                          BIT_ULL(NL80211_STA_INFO_CONNECTED_TIME) |
2147                          BIT_ULL(NL80211_STA_INFO_RX_DROP_MISC);
2148 
2149         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2150                 sinfo->beacon_loss_count = sdata->u.mgd.beacon_loss_count;
2151                 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_BEACON_LOSS);
2152         }
2153 
2154         sinfo->connected_time = ktime_get_seconds() - sta->last_connected;
2155         sinfo->inactive_time =
2156                 jiffies_to_msecs(jiffies - ieee80211_sta_last_active(sta));
2157 
2158         if (!(sinfo->filled & (BIT_ULL(NL80211_STA_INFO_TX_BYTES64) |
2159                                BIT_ULL(NL80211_STA_INFO_TX_BYTES)))) {
2160                 sinfo->tx_bytes = 0;
2161                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
2162                         sinfo->tx_bytes += sta->tx_stats.bytes[ac];
2163                 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_TX_BYTES64);
2164         }
2165 
2166         if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_TX_PACKETS))) {
2167                 sinfo->tx_packets = 0;
2168                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
2169                         sinfo->tx_packets += sta->tx_stats.packets[ac];
2170                 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_TX_PACKETS);
2171         }
2172 
2173         if (!(sinfo->filled & (BIT_ULL(NL80211_STA_INFO_RX_BYTES64) |
2174                                BIT_ULL(NL80211_STA_INFO_RX_BYTES)))) {
2175                 sinfo->rx_bytes += sta_get_stats_bytes(&sta->rx_stats);
2176 
2177                 if (sta->pcpu_rx_stats) {
2178                         for_each_possible_cpu(cpu) {
2179                                 struct ieee80211_sta_rx_stats *cpurxs;
2180 
2181                                 cpurxs = per_cpu_ptr(sta->pcpu_rx_stats, cpu);
2182                                 sinfo->rx_bytes += sta_get_stats_bytes(cpurxs);
2183                         }
2184                 }
2185 
2186                 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_RX_BYTES64);
2187         }
2188 
2189         if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_RX_PACKETS))) {
2190                 sinfo->rx_packets = sta->rx_stats.packets;
2191                 if (sta->pcpu_rx_stats) {
2192                         for_each_possible_cpu(cpu) {
2193                                 struct ieee80211_sta_rx_stats *cpurxs;
2194 
2195                                 cpurxs = per_cpu_ptr(sta->pcpu_rx_stats, cpu);
2196                                 sinfo->rx_packets += cpurxs->packets;
2197                         }
2198                 }
2199                 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_RX_PACKETS);
2200         }
2201 
2202         if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_TX_RETRIES))) {
2203                 sinfo->tx_retries = sta->status_stats.retry_count;
2204                 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_TX_RETRIES);
2205         }
2206 
2207         if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_TX_FAILED))) {
2208                 sinfo->tx_failed = sta->status_stats.retry_failed;
2209                 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_TX_FAILED);
2210         }
2211 
2212         if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_RX_DURATION))) {
2213                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
2214                         sinfo->rx_duration += sta->airtime[ac].rx_airtime;
2215                 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_RX_DURATION);
2216         }
2217 
2218         if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_TX_DURATION))) {
2219                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
2220                         sinfo->tx_duration += sta->airtime[ac].tx_airtime;
2221                 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_TX_DURATION);
2222         }
2223 
2224         if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_AIRTIME_WEIGHT))) {
2225                 sinfo->airtime_weight = sta->airtime_weight;
2226                 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_AIRTIME_WEIGHT);
2227         }
2228 
2229         sinfo->rx_dropped_misc = sta->rx_stats.dropped;
2230         if (sta->pcpu_rx_stats) {
2231                 for_each_possible_cpu(cpu) {
2232                         struct ieee80211_sta_rx_stats *cpurxs;
2233 
2234                         cpurxs = per_cpu_ptr(sta->pcpu_rx_stats, cpu);
2235                         sinfo->rx_dropped_misc += cpurxs->dropped;
2236                 }
2237         }
2238 
2239         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2240             !(sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)) {
2241                 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_BEACON_RX) |
2242                                  BIT_ULL(NL80211_STA_INFO_BEACON_SIGNAL_AVG);
2243                 sinfo->rx_beacon_signal_avg = ieee80211_ave_rssi(&sdata->vif);
2244         }
2245 
2246         if (ieee80211_hw_check(&sta->local->hw, SIGNAL_DBM) ||
2247             ieee80211_hw_check(&sta->local->hw, SIGNAL_UNSPEC)) {
2248                 if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_SIGNAL))) {
2249                         sinfo->signal = (s8)last_rxstats->last_signal;
2250                         sinfo->filled |= BIT_ULL(NL80211_STA_INFO_SIGNAL);
2251                 }
2252 
2253                 if (!sta->pcpu_rx_stats &&
2254                     !(sinfo->filled & BIT_ULL(NL80211_STA_INFO_SIGNAL_AVG))) {
2255                         sinfo->signal_avg =
2256                                 -ewma_signal_read(&sta->rx_stats_avg.signal);
2257                         sinfo->filled |= BIT_ULL(NL80211_STA_INFO_SIGNAL_AVG);
2258                 }
2259         }
2260 
2261         /* for the average - if pcpu_rx_stats isn't set - rxstats must point to
2262          * the sta->rx_stats struct, so the check here is fine with and without
2263          * pcpu statistics
2264          */
2265         if (last_rxstats->chains &&
2266             !(sinfo->filled & (BIT_ULL(NL80211_STA_INFO_CHAIN_SIGNAL) |
2267                                BIT_ULL(NL80211_STA_INFO_CHAIN_SIGNAL_AVG)))) {
2268                 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_CHAIN_SIGNAL);
2269                 if (!sta->pcpu_rx_stats)
2270                         sinfo->filled |= BIT_ULL(NL80211_STA_INFO_CHAIN_SIGNAL_AVG);
2271 
2272                 sinfo->chains = last_rxstats->chains;
2273 
2274                 for (i = 0; i < ARRAY_SIZE(sinfo->chain_signal); i++) {
2275                         sinfo->chain_signal[i] =
2276                                 last_rxstats->chain_signal_last[i];
2277                         sinfo->chain_signal_avg[i] =
2278                                 -ewma_signal_read(&sta->rx_stats_avg.chain_signal[i]);
2279                 }
2280         }
2281 
2282         if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_TX_BITRATE))) {
2283                 sta_set_rate_info_tx(sta, &sta->tx_stats.last_rate,
2284                                      &sinfo->txrate);
2285                 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_TX_BITRATE);
2286         }
2287 
2288         if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_RX_BITRATE))) {
2289                 if (sta_set_rate_info_rx(sta, &sinfo->rxrate) == 0)
2290                         sinfo->filled |= BIT_ULL(NL80211_STA_INFO_RX_BITRATE);
2291         }
2292 
2293         if (tidstats && !cfg80211_sinfo_alloc_tid_stats(sinfo, GFP_KERNEL)) {
2294                 for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++)
2295                         sta_set_tidstats(sta, &sinfo->pertid[i], i);
2296         }
2297 
2298         if (ieee80211_vif_is_mesh(&sdata->vif)) {
2299 #ifdef CONFIG_MAC80211_MESH
2300                 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_LLID) |
2301                                  BIT_ULL(NL80211_STA_INFO_PLID) |
2302                                  BIT_ULL(NL80211_STA_INFO_PLINK_STATE) |
2303                                  BIT_ULL(NL80211_STA_INFO_LOCAL_PM) |
2304                                  BIT_ULL(NL80211_STA_INFO_PEER_PM) |
2305                                  BIT_ULL(NL80211_STA_INFO_NONPEER_PM) |
2306                                  BIT_ULL(NL80211_STA_INFO_CONNECTED_TO_GATE);
2307 
2308                 sinfo->llid = sta->mesh->llid;
2309                 sinfo->plid = sta->mesh->plid;
2310                 sinfo->plink_state = sta->mesh->plink_state;
2311                 if (test_sta_flag(sta, WLAN_STA_TOFFSET_KNOWN)) {
2312                         sinfo->filled |= BIT_ULL(NL80211_STA_INFO_T_OFFSET);
2313                         sinfo->t_offset = sta->mesh->t_offset;
2314                 }
2315                 sinfo->local_pm = sta->mesh->local_pm;
2316                 sinfo->peer_pm = sta->mesh->peer_pm;
2317                 sinfo->nonpeer_pm = sta->mesh->nonpeer_pm;
2318                 sinfo->connected_to_gate = sta->mesh->connected_to_gate;
2319 #endif
2320         }
2321 
2322         sinfo->bss_param.flags = 0;
2323         if (sdata->vif.bss_conf.use_cts_prot)
2324                 sinfo->bss_param.flags |= BSS_PARAM_FLAGS_CTS_PROT;
2325         if (sdata->vif.bss_conf.use_short_preamble)
2326                 sinfo->bss_param.flags |= BSS_PARAM_FLAGS_SHORT_PREAMBLE;
2327         if (sdata->vif.bss_conf.use_short_slot)
2328                 sinfo->bss_param.flags |= BSS_PARAM_FLAGS_SHORT_SLOT_TIME;
2329         sinfo->bss_param.dtim_period = sdata->vif.bss_conf.dtim_period;
2330         sinfo->bss_param.beacon_interval = sdata->vif.bss_conf.beacon_int;
2331 
2332         sinfo->sta_flags.set = 0;
2333         sinfo->sta_flags.mask = BIT(NL80211_STA_FLAG_AUTHORIZED) |
2334                                 BIT(NL80211_STA_FLAG_SHORT_PREAMBLE) |
2335                                 BIT(NL80211_STA_FLAG_WME) |
2336                                 BIT(NL80211_STA_FLAG_MFP) |
2337                                 BIT(NL80211_STA_FLAG_AUTHENTICATED) |
2338                                 BIT(NL80211_STA_FLAG_ASSOCIATED) |
2339                                 BIT(NL80211_STA_FLAG_TDLS_PEER);
2340         if (test_sta_flag(sta, WLAN_STA_AUTHORIZED))
2341                 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_AUTHORIZED);
2342         if (test_sta_flag(sta, WLAN_STA_SHORT_PREAMBLE))
2343                 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_SHORT_PREAMBLE);
2344         if (sta->sta.wme)
2345                 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_WME);
2346         if (test_sta_flag(sta, WLAN_STA_MFP))
2347                 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_MFP);
2348         if (test_sta_flag(sta, WLAN_STA_AUTH))
2349                 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_AUTHENTICATED);
2350         if (test_sta_flag(sta, WLAN_STA_ASSOC))
2351                 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_ASSOCIATED);
2352         if (test_sta_flag(sta, WLAN_STA_TDLS_PEER))
2353                 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_TDLS_PEER);
2354 
2355         thr = sta_get_expected_throughput(sta);
2356 
2357         if (thr != 0) {
2358                 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_EXPECTED_THROUGHPUT);
2359                 sinfo->expected_throughput = thr;
2360         }
2361 
2362         if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_ACK_SIGNAL)) &&
2363             sta->status_stats.ack_signal_filled) {
2364                 sinfo->ack_signal = sta->status_stats.last_ack_signal;
2365                 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_ACK_SIGNAL);
2366         }
2367 
2368         if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_ACK_SIGNAL_AVG)) &&
2369             sta->status_stats.ack_signal_filled) {
2370                 sinfo->avg_ack_signal =
2371                         -(s8)ewma_avg_signal_read(
2372                                 &sta->status_stats.avg_ack_signal);
2373                 sinfo->filled |=
2374                         BIT_ULL(NL80211_STA_INFO_ACK_SIGNAL_AVG);
2375         }
2376 }
2377 
2378 u32 sta_get_expected_throughput(struct sta_info *sta)
2379 {
2380         struct ieee80211_sub_if_data *sdata = sta->sdata;
2381         struct ieee80211_local *local = sdata->local;
2382         struct rate_control_ref *ref = NULL;
2383         u32 thr = 0;
2384 
2385         if (test_sta_flag(sta, WLAN_STA_RATE_CONTROL))
2386                 ref = local->rate_ctrl;
2387 
2388         /* check if the driver has a SW RC implementation */
2389         if (ref && ref->ops->get_expected_throughput)
2390                 thr = ref->ops->get_expected_throughput(sta->rate_ctrl_priv);
2391         else
2392                 thr = drv_get_expected_throughput(local, sta);
2393 
2394         return thr;
2395 }
2396 
2397 unsigned long ieee80211_sta_last_active(struct sta_info *sta)
2398 {
2399         struct ieee80211_sta_rx_stats *stats = sta_get_last_rx_stats(sta);
2400 
2401         if (time_after(stats->last_rx, sta->status_stats.last_ack))
2402                 return stats->last_rx;
2403         return sta->status_stats.last_ack;
2404 }
2405 
2406 static void sta_update_codel_params(struct sta_info *sta, u32 thr)
2407 {
2408         if (!sta->sdata->local->ops->wake_tx_queue)
2409                 return;
2410 
2411         if (thr && thr < STA_SLOW_THRESHOLD * sta->local->num_sta) {
2412                 sta->cparams.target = MS2TIME(50);
2413                 sta->cparams.interval = MS2TIME(300);
2414                 sta->cparams.ecn = false;
2415         } else {
2416                 sta->cparams.target = MS2TIME(20);
2417                 sta->cparams.interval = MS2TIME(100);
2418                 sta->cparams.ecn = true;
2419         }
2420 }
2421 
2422 void ieee80211_sta_set_expected_throughput(struct ieee80211_sta *pubsta,
2423                                            u32 thr)
2424 {
2425         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
2426 
2427         sta_update_codel_params(sta, thr);
2428 }
2429 

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