xref: /linux/net/mac80211/sta_info.c (revision 36ec807b627b4c0a0a382f0ae48eac7187d14b2b)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright 2002-2005, Instant802 Networks, Inc.
4  * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
5  * Copyright 2013-2014  Intel Mobile Communications GmbH
6  * Copyright (C) 2015 - 2017 Intel Deutschland GmbH
7  * Copyright (C) 2018-2023 Intel Corporation
8  */
9 
10 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/etherdevice.h>
13 #include <linux/netdevice.h>
14 #include <linux/types.h>
15 #include <linux/slab.h>
16 #include <linux/skbuff.h>
17 #include <linux/if_arp.h>
18 #include <linux/timer.h>
19 #include <linux/rtnetlink.h>
20 
21 #include <net/codel.h>
22 #include <net/mac80211.h>
23 #include "ieee80211_i.h"
24 #include "driver-ops.h"
25 #include "rate.h"
26 #include "sta_info.h"
27 #include "debugfs_sta.h"
28 #include "mesh.h"
29 #include "wme.h"
30 
31 /**
32  * DOC: STA information lifetime rules
33  *
34  * STA info structures (&struct sta_info) are managed in a hash table
35  * for faster lookup and a list for iteration. They are managed using
36  * RCU, i.e. access to the list and hash table is protected by RCU.
37  *
38  * Upon allocating a STA info structure with sta_info_alloc(), the caller
39  * owns that structure. It must then insert it into the hash table using
40  * either sta_info_insert() or sta_info_insert_rcu(); only in the latter
41  * case (which acquires an rcu read section but must not be called from
42  * within one) will the pointer still be valid after the call. Note that
43  * the caller may not do much with the STA info before inserting it; in
44  * particular, it may not start any mesh peer link management or add
45  * encryption keys.
46  *
47  * When the insertion fails (sta_info_insert()) returns non-zero), the
48  * structure will have been freed by sta_info_insert()!
49  *
50  * Station entries are added by mac80211 when you establish a link with a
51  * peer. This means different things for the different type of interfaces
52  * we support. For a regular station this mean we add the AP sta when we
53  * receive an association response from the AP. For IBSS this occurs when
54  * get to know about a peer on the same IBSS. For WDS we add the sta for
55  * the peer immediately upon device open. When using AP mode we add stations
56  * for each respective station upon request from userspace through nl80211.
57  *
58  * In order to remove a STA info structure, various sta_info_destroy_*()
59  * calls are available.
60  *
61  * There is no concept of ownership on a STA entry; each structure is
62  * owned by the global hash table/list until it is removed. All users of
63  * the structure need to be RCU protected so that the structure won't be
64  * freed before they are done using it.
65  */
66 
67 struct sta_link_alloc {
68 	struct link_sta_info info;
69 	struct ieee80211_link_sta sta;
70 	struct rcu_head rcu_head;
71 };
72 
73 static const struct rhashtable_params sta_rht_params = {
74 	.nelem_hint = 3, /* start small */
75 	.automatic_shrinking = true,
76 	.head_offset = offsetof(struct sta_info, hash_node),
77 	.key_offset = offsetof(struct sta_info, addr),
78 	.key_len = ETH_ALEN,
79 	.max_size = CONFIG_MAC80211_STA_HASH_MAX_SIZE,
80 };
81 
82 static const struct rhashtable_params link_sta_rht_params = {
83 	.nelem_hint = 3, /* start small */
84 	.automatic_shrinking = true,
85 	.head_offset = offsetof(struct link_sta_info, link_hash_node),
86 	.key_offset = offsetof(struct link_sta_info, addr),
87 	.key_len = ETH_ALEN,
88 	.max_size = CONFIG_MAC80211_STA_HASH_MAX_SIZE,
89 };
90 
91 static int sta_info_hash_del(struct ieee80211_local *local,
92 			     struct sta_info *sta)
93 {
94 	return rhltable_remove(&local->sta_hash, &sta->hash_node,
95 			       sta_rht_params);
96 }
97 
98 static int link_sta_info_hash_add(struct ieee80211_local *local,
99 				  struct link_sta_info *link_sta)
100 {
101 	lockdep_assert_wiphy(local->hw.wiphy);
102 
103 	return rhltable_insert(&local->link_sta_hash,
104 			       &link_sta->link_hash_node, link_sta_rht_params);
105 }
106 
107 static int link_sta_info_hash_del(struct ieee80211_local *local,
108 				  struct link_sta_info *link_sta)
109 {
110 	lockdep_assert_wiphy(local->hw.wiphy);
111 
112 	return rhltable_remove(&local->link_sta_hash,
113 			       &link_sta->link_hash_node, link_sta_rht_params);
114 }
115 
116 void ieee80211_purge_sta_txqs(struct sta_info *sta)
117 {
118 	struct ieee80211_local *local = sta->sdata->local;
119 	int i;
120 
121 	for (i = 0; i < ARRAY_SIZE(sta->sta.txq); i++) {
122 		struct txq_info *txqi;
123 
124 		if (!sta->sta.txq[i])
125 			continue;
126 
127 		txqi = to_txq_info(sta->sta.txq[i]);
128 
129 		ieee80211_txq_purge(local, txqi);
130 	}
131 }
132 
133 static void __cleanup_single_sta(struct sta_info *sta)
134 {
135 	int ac, i;
136 	struct tid_ampdu_tx *tid_tx;
137 	struct ieee80211_sub_if_data *sdata = sta->sdata;
138 	struct ieee80211_local *local = sdata->local;
139 	struct ps_data *ps;
140 
141 	if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
142 	    test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
143 	    test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
144 		if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
145 		    sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
146 			ps = &sdata->bss->ps;
147 		else if (ieee80211_vif_is_mesh(&sdata->vif))
148 			ps = &sdata->u.mesh.ps;
149 		else
150 			return;
151 
152 		clear_sta_flag(sta, WLAN_STA_PS_STA);
153 		clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
154 		clear_sta_flag(sta, WLAN_STA_PS_DELIVER);
155 
156 		atomic_dec(&ps->num_sta_ps);
157 	}
158 
159 	ieee80211_purge_sta_txqs(sta);
160 
161 	for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
162 		local->total_ps_buffered -= skb_queue_len(&sta->ps_tx_buf[ac]);
163 		ieee80211_purge_tx_queue(&local->hw, &sta->ps_tx_buf[ac]);
164 		ieee80211_purge_tx_queue(&local->hw, &sta->tx_filtered[ac]);
165 	}
166 
167 	if (ieee80211_vif_is_mesh(&sdata->vif))
168 		mesh_sta_cleanup(sta);
169 
170 	cancel_work_sync(&sta->drv_deliver_wk);
171 
172 	/*
173 	 * Destroy aggregation state here. It would be nice to wait for the
174 	 * driver to finish aggregation stop and then clean up, but for now
175 	 * drivers have to handle aggregation stop being requested, followed
176 	 * directly by station destruction.
177 	 */
178 	for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
179 		kfree(sta->ampdu_mlme.tid_start_tx[i]);
180 		tid_tx = rcu_dereference_raw(sta->ampdu_mlme.tid_tx[i]);
181 		if (!tid_tx)
182 			continue;
183 		ieee80211_purge_tx_queue(&local->hw, &tid_tx->pending);
184 		kfree(tid_tx);
185 	}
186 }
187 
188 static void cleanup_single_sta(struct sta_info *sta)
189 {
190 	struct ieee80211_sub_if_data *sdata = sta->sdata;
191 	struct ieee80211_local *local = sdata->local;
192 
193 	__cleanup_single_sta(sta);
194 	sta_info_free(local, sta);
195 }
196 
197 struct rhlist_head *sta_info_hash_lookup(struct ieee80211_local *local,
198 					 const u8 *addr)
199 {
200 	return rhltable_lookup(&local->sta_hash, addr, sta_rht_params);
201 }
202 
203 /* protected by RCU */
204 struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
205 			      const u8 *addr)
206 {
207 	struct ieee80211_local *local = sdata->local;
208 	struct rhlist_head *tmp;
209 	struct sta_info *sta;
210 
211 	rcu_read_lock();
212 	for_each_sta_info(local, addr, sta, tmp) {
213 		if (sta->sdata == sdata) {
214 			rcu_read_unlock();
215 			/* this is safe as the caller must already hold
216 			 * another rcu read section or the mutex
217 			 */
218 			return sta;
219 		}
220 	}
221 	rcu_read_unlock();
222 	return NULL;
223 }
224 
225 /*
226  * Get sta info either from the specified interface
227  * or from one of its vlans
228  */
229 struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
230 				  const u8 *addr)
231 {
232 	struct ieee80211_local *local = sdata->local;
233 	struct rhlist_head *tmp;
234 	struct sta_info *sta;
235 
236 	rcu_read_lock();
237 	for_each_sta_info(local, addr, sta, tmp) {
238 		if (sta->sdata == sdata ||
239 		    (sta->sdata->bss && sta->sdata->bss == sdata->bss)) {
240 			rcu_read_unlock();
241 			/* this is safe as the caller must already hold
242 			 * another rcu read section or the mutex
243 			 */
244 			return sta;
245 		}
246 	}
247 	rcu_read_unlock();
248 	return NULL;
249 }
250 
251 struct rhlist_head *link_sta_info_hash_lookup(struct ieee80211_local *local,
252 					      const u8 *addr)
253 {
254 	return rhltable_lookup(&local->link_sta_hash, addr,
255 			       link_sta_rht_params);
256 }
257 
258 struct link_sta_info *
259 link_sta_info_get_bss(struct ieee80211_sub_if_data *sdata, const u8 *addr)
260 {
261 	struct ieee80211_local *local = sdata->local;
262 	struct rhlist_head *tmp;
263 	struct link_sta_info *link_sta;
264 
265 	rcu_read_lock();
266 	for_each_link_sta_info(local, addr, link_sta, tmp) {
267 		struct sta_info *sta = link_sta->sta;
268 
269 		if (sta->sdata == sdata ||
270 		    (sta->sdata->bss && sta->sdata->bss == sdata->bss)) {
271 			rcu_read_unlock();
272 			/* this is safe as the caller must already hold
273 			 * another rcu read section or the mutex
274 			 */
275 			return link_sta;
276 		}
277 	}
278 	rcu_read_unlock();
279 	return NULL;
280 }
281 
282 struct ieee80211_sta *
283 ieee80211_find_sta_by_link_addrs(struct ieee80211_hw *hw,
284 				 const u8 *addr,
285 				 const u8 *localaddr,
286 				 unsigned int *link_id)
287 {
288 	struct ieee80211_local *local = hw_to_local(hw);
289 	struct link_sta_info *link_sta;
290 	struct rhlist_head *tmp;
291 
292 	for_each_link_sta_info(local, addr, link_sta, tmp) {
293 		struct sta_info *sta = link_sta->sta;
294 		struct ieee80211_link_data *link;
295 		u8 _link_id = link_sta->link_id;
296 
297 		if (!localaddr) {
298 			if (link_id)
299 				*link_id = _link_id;
300 			return &sta->sta;
301 		}
302 
303 		link = rcu_dereference(sta->sdata->link[_link_id]);
304 		if (!link)
305 			continue;
306 
307 		if (memcmp(link->conf->addr, localaddr, ETH_ALEN))
308 			continue;
309 
310 		if (link_id)
311 			*link_id = _link_id;
312 		return &sta->sta;
313 	}
314 
315 	return NULL;
316 }
317 EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_link_addrs);
318 
319 struct sta_info *sta_info_get_by_addrs(struct ieee80211_local *local,
320 				       const u8 *sta_addr, const u8 *vif_addr)
321 {
322 	struct rhlist_head *tmp;
323 	struct sta_info *sta;
324 
325 	for_each_sta_info(local, sta_addr, sta, tmp) {
326 		if (ether_addr_equal(vif_addr, sta->sdata->vif.addr))
327 			return sta;
328 	}
329 
330 	return NULL;
331 }
332 
333 struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
334 				     int idx)
335 {
336 	struct ieee80211_local *local = sdata->local;
337 	struct sta_info *sta;
338 	int i = 0;
339 
340 	list_for_each_entry_rcu(sta, &local->sta_list, list,
341 				lockdep_is_held(&local->hw.wiphy->mtx)) {
342 		if (sdata != sta->sdata)
343 			continue;
344 		if (i < idx) {
345 			++i;
346 			continue;
347 		}
348 		return sta;
349 	}
350 
351 	return NULL;
352 }
353 
354 static void sta_info_free_link(struct link_sta_info *link_sta)
355 {
356 	free_percpu(link_sta->pcpu_rx_stats);
357 }
358 
359 static void sta_remove_link(struct sta_info *sta, unsigned int link_id,
360 			    bool unhash)
361 {
362 	struct sta_link_alloc *alloc = NULL;
363 	struct link_sta_info *link_sta;
364 
365 	lockdep_assert_wiphy(sta->local->hw.wiphy);
366 
367 	link_sta = rcu_access_pointer(sta->link[link_id]);
368 	if (WARN_ON(!link_sta))
369 		return;
370 
371 	if (unhash)
372 		link_sta_info_hash_del(sta->local, link_sta);
373 
374 	if (test_sta_flag(sta, WLAN_STA_INSERTED))
375 		ieee80211_link_sta_debugfs_remove(link_sta);
376 
377 	if (link_sta != &sta->deflink)
378 		alloc = container_of(link_sta, typeof(*alloc), info);
379 
380 	sta->sta.valid_links &= ~BIT(link_id);
381 	RCU_INIT_POINTER(sta->link[link_id], NULL);
382 	RCU_INIT_POINTER(sta->sta.link[link_id], NULL);
383 	if (alloc) {
384 		sta_info_free_link(&alloc->info);
385 		kfree_rcu(alloc, rcu_head);
386 	}
387 
388 	ieee80211_sta_recalc_aggregates(&sta->sta);
389 }
390 
391 /**
392  * sta_info_free - free STA
393  *
394  * @local: pointer to the global information
395  * @sta: STA info to free
396  *
397  * This function must undo everything done by sta_info_alloc()
398  * that may happen before sta_info_insert(). It may only be
399  * called when sta_info_insert() has not been attempted (and
400  * if that fails, the station is freed anyway.)
401  */
402 void sta_info_free(struct ieee80211_local *local, struct sta_info *sta)
403 {
404 	int i;
405 
406 	for (i = 0; i < ARRAY_SIZE(sta->link); i++) {
407 		struct link_sta_info *link_sta;
408 
409 		link_sta = rcu_access_pointer(sta->link[i]);
410 		if (!link_sta)
411 			continue;
412 
413 		sta_remove_link(sta, i, false);
414 	}
415 
416 	/*
417 	 * If we had used sta_info_pre_move_state() then we might not
418 	 * have gone through the state transitions down again, so do
419 	 * it here now (and warn if it's inserted).
420 	 *
421 	 * This will clear state such as fast TX/RX that may have been
422 	 * allocated during state transitions.
423 	 */
424 	while (sta->sta_state > IEEE80211_STA_NONE) {
425 		int ret;
426 
427 		WARN_ON_ONCE(test_sta_flag(sta, WLAN_STA_INSERTED));
428 
429 		ret = sta_info_move_state(sta, sta->sta_state - 1);
430 		if (WARN_ONCE(ret, "sta_info_move_state() returned %d\n", ret))
431 			break;
432 	}
433 
434 	if (sta->rate_ctrl)
435 		rate_control_free_sta(sta);
436 
437 	sta_dbg(sta->sdata, "Destroyed STA %pM\n", sta->sta.addr);
438 
439 	kfree(to_txq_info(sta->sta.txq[0]));
440 	kfree(rcu_dereference_raw(sta->sta.rates));
441 #ifdef CONFIG_MAC80211_MESH
442 	kfree(sta->mesh);
443 #endif
444 
445 	sta_info_free_link(&sta->deflink);
446 	kfree(sta);
447 }
448 
449 static int sta_info_hash_add(struct ieee80211_local *local,
450 			     struct sta_info *sta)
451 {
452 	return rhltable_insert(&local->sta_hash, &sta->hash_node,
453 			       sta_rht_params);
454 }
455 
456 static void sta_deliver_ps_frames(struct work_struct *wk)
457 {
458 	struct sta_info *sta;
459 
460 	sta = container_of(wk, struct sta_info, drv_deliver_wk);
461 
462 	if (sta->dead)
463 		return;
464 
465 	local_bh_disable();
466 	if (!test_sta_flag(sta, WLAN_STA_PS_STA))
467 		ieee80211_sta_ps_deliver_wakeup(sta);
468 	else if (test_and_clear_sta_flag(sta, WLAN_STA_PSPOLL))
469 		ieee80211_sta_ps_deliver_poll_response(sta);
470 	else if (test_and_clear_sta_flag(sta, WLAN_STA_UAPSD))
471 		ieee80211_sta_ps_deliver_uapsd(sta);
472 	local_bh_enable();
473 }
474 
475 static int sta_prepare_rate_control(struct ieee80211_local *local,
476 				    struct sta_info *sta, gfp_t gfp)
477 {
478 	if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL))
479 		return 0;
480 
481 	sta->rate_ctrl = local->rate_ctrl;
482 	sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl,
483 						     sta, gfp);
484 	if (!sta->rate_ctrl_priv)
485 		return -ENOMEM;
486 
487 	return 0;
488 }
489 
490 static int sta_info_alloc_link(struct ieee80211_local *local,
491 			       struct link_sta_info *link_info,
492 			       gfp_t gfp)
493 {
494 	struct ieee80211_hw *hw = &local->hw;
495 	int i;
496 
497 	if (ieee80211_hw_check(hw, USES_RSS)) {
498 		link_info->pcpu_rx_stats =
499 			alloc_percpu_gfp(struct ieee80211_sta_rx_stats, gfp);
500 		if (!link_info->pcpu_rx_stats)
501 			return -ENOMEM;
502 	}
503 
504 	link_info->rx_stats.last_rx = jiffies;
505 	u64_stats_init(&link_info->rx_stats.syncp);
506 
507 	ewma_signal_init(&link_info->rx_stats_avg.signal);
508 	ewma_avg_signal_init(&link_info->status_stats.avg_ack_signal);
509 	for (i = 0; i < ARRAY_SIZE(link_info->rx_stats_avg.chain_signal); i++)
510 		ewma_signal_init(&link_info->rx_stats_avg.chain_signal[i]);
511 
512 	return 0;
513 }
514 
515 static void sta_info_add_link(struct sta_info *sta,
516 			      unsigned int link_id,
517 			      struct link_sta_info *link_info,
518 			      struct ieee80211_link_sta *link_sta)
519 {
520 	link_info->sta = sta;
521 	link_info->link_id = link_id;
522 	link_info->pub = link_sta;
523 	link_info->pub->sta = &sta->sta;
524 	link_sta->link_id = link_id;
525 	rcu_assign_pointer(sta->link[link_id], link_info);
526 	rcu_assign_pointer(sta->sta.link[link_id], link_sta);
527 
528 	link_sta->smps_mode = IEEE80211_SMPS_OFF;
529 	link_sta->agg.max_rc_amsdu_len = IEEE80211_MAX_MPDU_LEN_HT_BA;
530 }
531 
532 static struct sta_info *
533 __sta_info_alloc(struct ieee80211_sub_if_data *sdata,
534 		 const u8 *addr, int link_id, const u8 *link_addr,
535 		 gfp_t gfp)
536 {
537 	struct ieee80211_local *local = sdata->local;
538 	struct ieee80211_hw *hw = &local->hw;
539 	struct sta_info *sta;
540 	void *txq_data;
541 	int size;
542 	int i;
543 
544 	sta = kzalloc(sizeof(*sta) + hw->sta_data_size, gfp);
545 	if (!sta)
546 		return NULL;
547 
548 	sta->local = local;
549 	sta->sdata = sdata;
550 
551 	if (sta_info_alloc_link(local, &sta->deflink, gfp))
552 		goto free;
553 
554 	if (link_id >= 0) {
555 		sta_info_add_link(sta, link_id, &sta->deflink,
556 				  &sta->sta.deflink);
557 		sta->sta.valid_links = BIT(link_id);
558 	} else {
559 		sta_info_add_link(sta, 0, &sta->deflink, &sta->sta.deflink);
560 	}
561 
562 	sta->sta.cur = &sta->sta.deflink.agg;
563 
564 	spin_lock_init(&sta->lock);
565 	spin_lock_init(&sta->ps_lock);
566 	INIT_WORK(&sta->drv_deliver_wk, sta_deliver_ps_frames);
567 	wiphy_work_init(&sta->ampdu_mlme.work, ieee80211_ba_session_work);
568 #ifdef CONFIG_MAC80211_MESH
569 	if (ieee80211_vif_is_mesh(&sdata->vif)) {
570 		sta->mesh = kzalloc(sizeof(*sta->mesh), gfp);
571 		if (!sta->mesh)
572 			goto free;
573 		sta->mesh->plink_sta = sta;
574 		spin_lock_init(&sta->mesh->plink_lock);
575 		if (!sdata->u.mesh.user_mpm)
576 			timer_setup(&sta->mesh->plink_timer, mesh_plink_timer,
577 				    0);
578 		sta->mesh->nonpeer_pm = NL80211_MESH_POWER_ACTIVE;
579 	}
580 #endif
581 
582 	memcpy(sta->addr, addr, ETH_ALEN);
583 	memcpy(sta->sta.addr, addr, ETH_ALEN);
584 	memcpy(sta->deflink.addr, link_addr, ETH_ALEN);
585 	memcpy(sta->sta.deflink.addr, link_addr, ETH_ALEN);
586 	sta->sta.max_rx_aggregation_subframes =
587 		local->hw.max_rx_aggregation_subframes;
588 
589 	/* TODO link specific alloc and assignments for MLO Link STA */
590 
591 	/* Extended Key ID needs to install keys for keyid 0 and 1 Rx-only.
592 	 * The Tx path starts to use a key as soon as the key slot ptk_idx
593 	 * references to is not NULL. To not use the initial Rx-only key
594 	 * prematurely for Tx initialize ptk_idx to an impossible PTK keyid
595 	 * which always will refer to a NULL key.
596 	 */
597 	BUILD_BUG_ON(ARRAY_SIZE(sta->ptk) <= INVALID_PTK_KEYIDX);
598 	sta->ptk_idx = INVALID_PTK_KEYIDX;
599 
600 
601 	ieee80211_init_frag_cache(&sta->frags);
602 
603 	sta->sta_state = IEEE80211_STA_NONE;
604 
605 	if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
606 		sta->amsdu_mesh_control = -1;
607 
608 	/* Mark TID as unreserved */
609 	sta->reserved_tid = IEEE80211_TID_UNRESERVED;
610 
611 	sta->last_connected = ktime_get_seconds();
612 
613 	size = sizeof(struct txq_info) +
614 	       ALIGN(hw->txq_data_size, sizeof(void *));
615 
616 	txq_data = kcalloc(ARRAY_SIZE(sta->sta.txq), size, gfp);
617 	if (!txq_data)
618 		goto free;
619 
620 	for (i = 0; i < ARRAY_SIZE(sta->sta.txq); i++) {
621 		struct txq_info *txq = txq_data + i * size;
622 
623 		/* might not do anything for the (bufferable) MMPDU TXQ */
624 		ieee80211_txq_init(sdata, sta, txq, i);
625 	}
626 
627 	if (sta_prepare_rate_control(local, sta, gfp))
628 		goto free_txq;
629 
630 	sta->airtime_weight = IEEE80211_DEFAULT_AIRTIME_WEIGHT;
631 
632 	for (i = 0; i < IEEE80211_NUM_ACS; i++) {
633 		skb_queue_head_init(&sta->ps_tx_buf[i]);
634 		skb_queue_head_init(&sta->tx_filtered[i]);
635 		sta->airtime[i].deficit = sta->airtime_weight;
636 		atomic_set(&sta->airtime[i].aql_tx_pending, 0);
637 		sta->airtime[i].aql_limit_low = local->aql_txq_limit_low[i];
638 		sta->airtime[i].aql_limit_high = local->aql_txq_limit_high[i];
639 	}
640 
641 	for (i = 0; i < IEEE80211_NUM_TIDS; i++)
642 		sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX);
643 
644 	for (i = 0; i < NUM_NL80211_BANDS; i++) {
645 		u32 mandatory = 0;
646 		int r;
647 
648 		if (!hw->wiphy->bands[i])
649 			continue;
650 
651 		switch (i) {
652 		case NL80211_BAND_2GHZ:
653 		case NL80211_BAND_LC:
654 			/*
655 			 * We use both here, even if we cannot really know for
656 			 * sure the station will support both, but the only use
657 			 * for this is when we don't know anything yet and send
658 			 * management frames, and then we'll pick the lowest
659 			 * possible rate anyway.
660 			 * If we don't include _G here, we cannot find a rate
661 			 * in P2P, and thus trigger the WARN_ONCE() in rate.c
662 			 */
663 			mandatory = IEEE80211_RATE_MANDATORY_B |
664 				    IEEE80211_RATE_MANDATORY_G;
665 			break;
666 		case NL80211_BAND_5GHZ:
667 			mandatory = IEEE80211_RATE_MANDATORY_A;
668 			break;
669 		case NL80211_BAND_60GHZ:
670 			WARN_ON(1);
671 			mandatory = 0;
672 			break;
673 		}
674 
675 		for (r = 0; r < hw->wiphy->bands[i]->n_bitrates; r++) {
676 			struct ieee80211_rate *rate;
677 
678 			rate = &hw->wiphy->bands[i]->bitrates[r];
679 
680 			if (!(rate->flags & mandatory))
681 				continue;
682 			sta->sta.deflink.supp_rates[i] |= BIT(r);
683 		}
684 	}
685 
686 	sta->cparams.ce_threshold = CODEL_DISABLED_THRESHOLD;
687 	sta->cparams.target = MS2TIME(20);
688 	sta->cparams.interval = MS2TIME(100);
689 	sta->cparams.ecn = true;
690 	sta->cparams.ce_threshold_selector = 0;
691 	sta->cparams.ce_threshold_mask = 0;
692 
693 	sta_dbg(sdata, "Allocated STA %pM\n", sta->sta.addr);
694 
695 	return sta;
696 
697 free_txq:
698 	kfree(to_txq_info(sta->sta.txq[0]));
699 free:
700 	sta_info_free_link(&sta->deflink);
701 #ifdef CONFIG_MAC80211_MESH
702 	kfree(sta->mesh);
703 #endif
704 	kfree(sta);
705 	return NULL;
706 }
707 
708 struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
709 				const u8 *addr, gfp_t gfp)
710 {
711 	return __sta_info_alloc(sdata, addr, -1, addr, gfp);
712 }
713 
714 struct sta_info *sta_info_alloc_with_link(struct ieee80211_sub_if_data *sdata,
715 					  const u8 *mld_addr,
716 					  unsigned int link_id,
717 					  const u8 *link_addr,
718 					  gfp_t gfp)
719 {
720 	return __sta_info_alloc(sdata, mld_addr, link_id, link_addr, gfp);
721 }
722 
723 static int sta_info_insert_check(struct sta_info *sta)
724 {
725 	struct ieee80211_sub_if_data *sdata = sta->sdata;
726 
727 	lockdep_assert_wiphy(sdata->local->hw.wiphy);
728 
729 	/*
730 	 * Can't be a WARN_ON because it can be triggered through a race:
731 	 * something inserts a STA (on one CPU) without holding the RTNL
732 	 * and another CPU turns off the net device.
733 	 */
734 	if (unlikely(!ieee80211_sdata_running(sdata)))
735 		return -ENETDOWN;
736 
737 	if (WARN_ON(ether_addr_equal(sta->sta.addr, sdata->vif.addr) ||
738 		    !is_valid_ether_addr(sta->sta.addr)))
739 		return -EINVAL;
740 
741 	/* The RCU read lock is required by rhashtable due to
742 	 * asynchronous resize/rehash.  We also require the mutex
743 	 * for correctness.
744 	 */
745 	rcu_read_lock();
746 	if (ieee80211_hw_check(&sdata->local->hw, NEEDS_UNIQUE_STA_ADDR) &&
747 	    ieee80211_find_sta_by_ifaddr(&sdata->local->hw, sta->addr, NULL)) {
748 		rcu_read_unlock();
749 		return -ENOTUNIQ;
750 	}
751 	rcu_read_unlock();
752 
753 	return 0;
754 }
755 
756 static int sta_info_insert_drv_state(struct ieee80211_local *local,
757 				     struct ieee80211_sub_if_data *sdata,
758 				     struct sta_info *sta)
759 {
760 	enum ieee80211_sta_state state;
761 	int err = 0;
762 
763 	for (state = IEEE80211_STA_NOTEXIST; state < sta->sta_state; state++) {
764 		err = drv_sta_state(local, sdata, sta, state, state + 1);
765 		if (err)
766 			break;
767 	}
768 
769 	if (!err) {
770 		/*
771 		 * Drivers using legacy sta_add/sta_remove callbacks only
772 		 * get uploaded set to true after sta_add is called.
773 		 */
774 		if (!local->ops->sta_add)
775 			sta->uploaded = true;
776 		return 0;
777 	}
778 
779 	if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
780 		sdata_info(sdata,
781 			   "failed to move IBSS STA %pM to state %d (%d) - keeping it anyway\n",
782 			   sta->sta.addr, state + 1, err);
783 		err = 0;
784 	}
785 
786 	/* unwind on error */
787 	for (; state > IEEE80211_STA_NOTEXIST; state--)
788 		WARN_ON(drv_sta_state(local, sdata, sta, state, state - 1));
789 
790 	return err;
791 }
792 
793 static void
794 ieee80211_recalc_p2p_go_ps_allowed(struct ieee80211_sub_if_data *sdata)
795 {
796 	struct ieee80211_local *local = sdata->local;
797 	bool allow_p2p_go_ps = sdata->vif.p2p;
798 	struct sta_info *sta;
799 
800 	rcu_read_lock();
801 	list_for_each_entry_rcu(sta, &local->sta_list, list) {
802 		if (sdata != sta->sdata ||
803 		    !test_sta_flag(sta, WLAN_STA_ASSOC))
804 			continue;
805 		if (!sta->sta.support_p2p_ps) {
806 			allow_p2p_go_ps = false;
807 			break;
808 		}
809 	}
810 	rcu_read_unlock();
811 
812 	if (allow_p2p_go_ps != sdata->vif.bss_conf.allow_p2p_go_ps) {
813 		sdata->vif.bss_conf.allow_p2p_go_ps = allow_p2p_go_ps;
814 		ieee80211_link_info_change_notify(sdata, &sdata->deflink,
815 						  BSS_CHANGED_P2P_PS);
816 	}
817 }
818 
819 static int sta_info_insert_finish(struct sta_info *sta) __acquires(RCU)
820 {
821 	struct ieee80211_local *local = sta->local;
822 	struct ieee80211_sub_if_data *sdata = sta->sdata;
823 	struct station_info *sinfo = NULL;
824 	int err = 0;
825 
826 	lockdep_assert_wiphy(local->hw.wiphy);
827 
828 	/* check if STA exists already */
829 	if (sta_info_get_bss(sdata, sta->sta.addr)) {
830 		err = -EEXIST;
831 		goto out_cleanup;
832 	}
833 
834 	sinfo = kzalloc(sizeof(struct station_info), GFP_KERNEL);
835 	if (!sinfo) {
836 		err = -ENOMEM;
837 		goto out_cleanup;
838 	}
839 
840 	local->num_sta++;
841 	local->sta_generation++;
842 	smp_mb();
843 
844 	/* simplify things and don't accept BA sessions yet */
845 	set_sta_flag(sta, WLAN_STA_BLOCK_BA);
846 
847 	/* make the station visible */
848 	err = sta_info_hash_add(local, sta);
849 	if (err)
850 		goto out_drop_sta;
851 
852 	if (sta->sta.valid_links) {
853 		err = link_sta_info_hash_add(local, &sta->deflink);
854 		if (err) {
855 			sta_info_hash_del(local, sta);
856 			goto out_drop_sta;
857 		}
858 	}
859 
860 	list_add_tail_rcu(&sta->list, &local->sta_list);
861 
862 	/* update channel context before notifying the driver about state
863 	 * change, this enables driver using the updated channel context right away.
864 	 */
865 	if (sta->sta_state >= IEEE80211_STA_ASSOC) {
866 		ieee80211_recalc_min_chandef(sta->sdata, -1);
867 		if (!sta->sta.support_p2p_ps)
868 			ieee80211_recalc_p2p_go_ps_allowed(sta->sdata);
869 	}
870 
871 	/* notify driver */
872 	err = sta_info_insert_drv_state(local, sdata, sta);
873 	if (err)
874 		goto out_remove;
875 
876 	set_sta_flag(sta, WLAN_STA_INSERTED);
877 
878 	/* accept BA sessions now */
879 	clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
880 
881 	ieee80211_sta_debugfs_add(sta);
882 	rate_control_add_sta_debugfs(sta);
883 	if (sta->sta.valid_links) {
884 		int i;
885 
886 		for (i = 0; i < ARRAY_SIZE(sta->link); i++) {
887 			struct link_sta_info *link_sta;
888 
889 			link_sta = rcu_dereference_protected(sta->link[i],
890 							     lockdep_is_held(&local->hw.wiphy->mtx));
891 
892 			if (!link_sta)
893 				continue;
894 
895 			ieee80211_link_sta_debugfs_add(link_sta);
896 			if (sdata->vif.active_links & BIT(i))
897 				ieee80211_link_sta_debugfs_drv_add(link_sta);
898 		}
899 	} else {
900 		ieee80211_link_sta_debugfs_add(&sta->deflink);
901 		ieee80211_link_sta_debugfs_drv_add(&sta->deflink);
902 	}
903 
904 	sinfo->generation = local->sta_generation;
905 	cfg80211_new_sta(sdata->dev, sta->sta.addr, sinfo, GFP_KERNEL);
906 	kfree(sinfo);
907 
908 	sta_dbg(sdata, "Inserted STA %pM\n", sta->sta.addr);
909 
910 	/* move reference to rcu-protected */
911 	rcu_read_lock();
912 
913 	if (ieee80211_vif_is_mesh(&sdata->vif))
914 		mesh_accept_plinks_update(sdata);
915 
916 	ieee80211_check_fast_xmit(sta);
917 
918 	return 0;
919  out_remove:
920 	if (sta->sta.valid_links)
921 		link_sta_info_hash_del(local, &sta->deflink);
922 	sta_info_hash_del(local, sta);
923 	list_del_rcu(&sta->list);
924  out_drop_sta:
925 	local->num_sta--;
926 	synchronize_net();
927  out_cleanup:
928 	cleanup_single_sta(sta);
929 	kfree(sinfo);
930 	rcu_read_lock();
931 	return err;
932 }
933 
934 int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU)
935 {
936 	struct ieee80211_local *local = sta->local;
937 	int err;
938 
939 	might_sleep();
940 	lockdep_assert_wiphy(local->hw.wiphy);
941 
942 	err = sta_info_insert_check(sta);
943 	if (err) {
944 		sta_info_free(local, sta);
945 		rcu_read_lock();
946 		return err;
947 	}
948 
949 	return sta_info_insert_finish(sta);
950 }
951 
952 int sta_info_insert(struct sta_info *sta)
953 {
954 	int err = sta_info_insert_rcu(sta);
955 
956 	rcu_read_unlock();
957 
958 	return err;
959 }
960 
961 static inline void __bss_tim_set(u8 *tim, u16 id)
962 {
963 	/*
964 	 * This format has been mandated by the IEEE specifications,
965 	 * so this line may not be changed to use the __set_bit() format.
966 	 */
967 	tim[id / 8] |= (1 << (id % 8));
968 }
969 
970 static inline void __bss_tim_clear(u8 *tim, u16 id)
971 {
972 	/*
973 	 * This format has been mandated by the IEEE specifications,
974 	 * so this line may not be changed to use the __clear_bit() format.
975 	 */
976 	tim[id / 8] &= ~(1 << (id % 8));
977 }
978 
979 static inline bool __bss_tim_get(u8 *tim, u16 id)
980 {
981 	/*
982 	 * This format has been mandated by the IEEE specifications,
983 	 * so this line may not be changed to use the test_bit() format.
984 	 */
985 	return tim[id / 8] & (1 << (id % 8));
986 }
987 
988 static unsigned long ieee80211_tids_for_ac(int ac)
989 {
990 	/* If we ever support TIDs > 7, this obviously needs to be adjusted */
991 	switch (ac) {
992 	case IEEE80211_AC_VO:
993 		return BIT(6) | BIT(7);
994 	case IEEE80211_AC_VI:
995 		return BIT(4) | BIT(5);
996 	case IEEE80211_AC_BE:
997 		return BIT(0) | BIT(3);
998 	case IEEE80211_AC_BK:
999 		return BIT(1) | BIT(2);
1000 	default:
1001 		WARN_ON(1);
1002 		return 0;
1003 	}
1004 }
1005 
1006 static void __sta_info_recalc_tim(struct sta_info *sta, bool ignore_pending)
1007 {
1008 	struct ieee80211_local *local = sta->local;
1009 	struct ps_data *ps;
1010 	bool indicate_tim = false;
1011 	u8 ignore_for_tim = sta->sta.uapsd_queues;
1012 	int ac;
1013 	u16 id = sta->sta.aid;
1014 
1015 	if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1016 	    sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1017 		if (WARN_ON_ONCE(!sta->sdata->bss))
1018 			return;
1019 
1020 		ps = &sta->sdata->bss->ps;
1021 #ifdef CONFIG_MAC80211_MESH
1022 	} else if (ieee80211_vif_is_mesh(&sta->sdata->vif)) {
1023 		ps = &sta->sdata->u.mesh.ps;
1024 #endif
1025 	} else {
1026 		return;
1027 	}
1028 
1029 	/* No need to do anything if the driver does all */
1030 	if (ieee80211_hw_check(&local->hw, AP_LINK_PS) && !local->ops->set_tim)
1031 		return;
1032 
1033 	if (sta->dead)
1034 		goto done;
1035 
1036 	/*
1037 	 * If all ACs are delivery-enabled then we should build
1038 	 * the TIM bit for all ACs anyway; if only some are then
1039 	 * we ignore those and build the TIM bit using only the
1040 	 * non-enabled ones.
1041 	 */
1042 	if (ignore_for_tim == BIT(IEEE80211_NUM_ACS) - 1)
1043 		ignore_for_tim = 0;
1044 
1045 	if (ignore_pending)
1046 		ignore_for_tim = BIT(IEEE80211_NUM_ACS) - 1;
1047 
1048 	for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1049 		unsigned long tids;
1050 
1051 		if (ignore_for_tim & ieee80211_ac_to_qos_mask[ac])
1052 			continue;
1053 
1054 		indicate_tim |= !skb_queue_empty(&sta->tx_filtered[ac]) ||
1055 				!skb_queue_empty(&sta->ps_tx_buf[ac]);
1056 		if (indicate_tim)
1057 			break;
1058 
1059 		tids = ieee80211_tids_for_ac(ac);
1060 
1061 		indicate_tim |=
1062 			sta->driver_buffered_tids & tids;
1063 		indicate_tim |=
1064 			sta->txq_buffered_tids & tids;
1065 	}
1066 
1067  done:
1068 	spin_lock_bh(&local->tim_lock);
1069 
1070 	if (indicate_tim == __bss_tim_get(ps->tim, id))
1071 		goto out_unlock;
1072 
1073 	if (indicate_tim)
1074 		__bss_tim_set(ps->tim, id);
1075 	else
1076 		__bss_tim_clear(ps->tim, id);
1077 
1078 	if (local->ops->set_tim && !WARN_ON(sta->dead)) {
1079 		local->tim_in_locked_section = true;
1080 		drv_set_tim(local, &sta->sta, indicate_tim);
1081 		local->tim_in_locked_section = false;
1082 	}
1083 
1084 out_unlock:
1085 	spin_unlock_bh(&local->tim_lock);
1086 }
1087 
1088 void sta_info_recalc_tim(struct sta_info *sta)
1089 {
1090 	__sta_info_recalc_tim(sta, false);
1091 }
1092 
1093 static bool sta_info_buffer_expired(struct sta_info *sta, struct sk_buff *skb)
1094 {
1095 	struct ieee80211_tx_info *info;
1096 	int timeout;
1097 
1098 	if (!skb)
1099 		return false;
1100 
1101 	info = IEEE80211_SKB_CB(skb);
1102 
1103 	/* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
1104 	timeout = (sta->listen_interval *
1105 		   sta->sdata->vif.bss_conf.beacon_int *
1106 		   32 / 15625) * HZ;
1107 	if (timeout < STA_TX_BUFFER_EXPIRE)
1108 		timeout = STA_TX_BUFFER_EXPIRE;
1109 	return time_after(jiffies, info->control.jiffies + timeout);
1110 }
1111 
1112 
1113 static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local *local,
1114 						struct sta_info *sta, int ac)
1115 {
1116 	unsigned long flags;
1117 	struct sk_buff *skb;
1118 
1119 	/*
1120 	 * First check for frames that should expire on the filtered
1121 	 * queue. Frames here were rejected by the driver and are on
1122 	 * a separate queue to avoid reordering with normal PS-buffered
1123 	 * frames. They also aren't accounted for right now in the
1124 	 * total_ps_buffered counter.
1125 	 */
1126 	for (;;) {
1127 		spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
1128 		skb = skb_peek(&sta->tx_filtered[ac]);
1129 		if (sta_info_buffer_expired(sta, skb))
1130 			skb = __skb_dequeue(&sta->tx_filtered[ac]);
1131 		else
1132 			skb = NULL;
1133 		spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
1134 
1135 		/*
1136 		 * Frames are queued in order, so if this one
1137 		 * hasn't expired yet we can stop testing. If
1138 		 * we actually reached the end of the queue we
1139 		 * also need to stop, of course.
1140 		 */
1141 		if (!skb)
1142 			break;
1143 		ieee80211_free_txskb(&local->hw, skb);
1144 	}
1145 
1146 	/*
1147 	 * Now also check the normal PS-buffered queue, this will
1148 	 * only find something if the filtered queue was emptied
1149 	 * since the filtered frames are all before the normal PS
1150 	 * buffered frames.
1151 	 */
1152 	for (;;) {
1153 		spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
1154 		skb = skb_peek(&sta->ps_tx_buf[ac]);
1155 		if (sta_info_buffer_expired(sta, skb))
1156 			skb = __skb_dequeue(&sta->ps_tx_buf[ac]);
1157 		else
1158 			skb = NULL;
1159 		spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
1160 
1161 		/*
1162 		 * frames are queued in order, so if this one
1163 		 * hasn't expired yet (or we reached the end of
1164 		 * the queue) we can stop testing
1165 		 */
1166 		if (!skb)
1167 			break;
1168 
1169 		local->total_ps_buffered--;
1170 		ps_dbg(sta->sdata, "Buffered frame expired (STA %pM)\n",
1171 		       sta->sta.addr);
1172 		ieee80211_free_txskb(&local->hw, skb);
1173 	}
1174 
1175 	/*
1176 	 * Finally, recalculate the TIM bit for this station -- it might
1177 	 * now be clear because the station was too slow to retrieve its
1178 	 * frames.
1179 	 */
1180 	sta_info_recalc_tim(sta);
1181 
1182 	/*
1183 	 * Return whether there are any frames still buffered, this is
1184 	 * used to check whether the cleanup timer still needs to run,
1185 	 * if there are no frames we don't need to rearm the timer.
1186 	 */
1187 	return !(skb_queue_empty(&sta->ps_tx_buf[ac]) &&
1188 		 skb_queue_empty(&sta->tx_filtered[ac]));
1189 }
1190 
1191 static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
1192 					     struct sta_info *sta)
1193 {
1194 	bool have_buffered = false;
1195 	int ac;
1196 
1197 	/* This is only necessary for stations on BSS/MBSS interfaces */
1198 	if (!sta->sdata->bss &&
1199 	    !ieee80211_vif_is_mesh(&sta->sdata->vif))
1200 		return false;
1201 
1202 	for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
1203 		have_buffered |=
1204 			sta_info_cleanup_expire_buffered_ac(local, sta, ac);
1205 
1206 	return have_buffered;
1207 }
1208 
1209 static int __must_check __sta_info_destroy_part1(struct sta_info *sta)
1210 {
1211 	struct ieee80211_local *local;
1212 	struct ieee80211_sub_if_data *sdata;
1213 	int ret, i;
1214 
1215 	might_sleep();
1216 
1217 	if (!sta)
1218 		return -ENOENT;
1219 
1220 	local = sta->local;
1221 	sdata = sta->sdata;
1222 
1223 	lockdep_assert_wiphy(local->hw.wiphy);
1224 
1225 	/*
1226 	 * Before removing the station from the driver and
1227 	 * rate control, it might still start new aggregation
1228 	 * sessions -- block that to make sure the tear-down
1229 	 * will be sufficient.
1230 	 */
1231 	set_sta_flag(sta, WLAN_STA_BLOCK_BA);
1232 	ieee80211_sta_tear_down_BA_sessions(sta, AGG_STOP_DESTROY_STA);
1233 
1234 	/*
1235 	 * Before removing the station from the driver there might be pending
1236 	 * rx frames on RSS queues sent prior to the disassociation - wait for
1237 	 * all such frames to be processed.
1238 	 */
1239 	drv_sync_rx_queues(local, sta);
1240 
1241 	for (i = 0; i < ARRAY_SIZE(sta->link); i++) {
1242 		struct link_sta_info *link_sta;
1243 
1244 		if (!(sta->sta.valid_links & BIT(i)))
1245 			continue;
1246 
1247 		link_sta = rcu_dereference_protected(sta->link[i],
1248 						     lockdep_is_held(&local->hw.wiphy->mtx));
1249 
1250 		link_sta_info_hash_del(local, link_sta);
1251 	}
1252 
1253 	ret = sta_info_hash_del(local, sta);
1254 	if (WARN_ON(ret))
1255 		return ret;
1256 
1257 	/*
1258 	 * for TDLS peers, make sure to return to the base channel before
1259 	 * removal.
1260 	 */
1261 	if (test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) {
1262 		drv_tdls_cancel_channel_switch(local, sdata, &sta->sta);
1263 		clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1264 	}
1265 
1266 	list_del_rcu(&sta->list);
1267 	sta->removed = true;
1268 
1269 	if (sta->uploaded)
1270 		drv_sta_pre_rcu_remove(local, sta->sdata, sta);
1271 
1272 	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1273 	    rcu_access_pointer(sdata->u.vlan.sta) == sta)
1274 		RCU_INIT_POINTER(sdata->u.vlan.sta, NULL);
1275 
1276 	return 0;
1277 }
1278 
1279 static int _sta_info_move_state(struct sta_info *sta,
1280 				enum ieee80211_sta_state new_state,
1281 				bool recalc)
1282 {
1283 	struct ieee80211_local *local = sta->local;
1284 
1285 	might_sleep();
1286 
1287 	if (sta->sta_state == new_state)
1288 		return 0;
1289 
1290 	/* check allowed transitions first */
1291 
1292 	switch (new_state) {
1293 	case IEEE80211_STA_NONE:
1294 		if (sta->sta_state != IEEE80211_STA_AUTH)
1295 			return -EINVAL;
1296 		break;
1297 	case IEEE80211_STA_AUTH:
1298 		if (sta->sta_state != IEEE80211_STA_NONE &&
1299 		    sta->sta_state != IEEE80211_STA_ASSOC)
1300 			return -EINVAL;
1301 		break;
1302 	case IEEE80211_STA_ASSOC:
1303 		if (sta->sta_state != IEEE80211_STA_AUTH &&
1304 		    sta->sta_state != IEEE80211_STA_AUTHORIZED)
1305 			return -EINVAL;
1306 		break;
1307 	case IEEE80211_STA_AUTHORIZED:
1308 		if (sta->sta_state != IEEE80211_STA_ASSOC)
1309 			return -EINVAL;
1310 		break;
1311 	default:
1312 		WARN(1, "invalid state %d", new_state);
1313 		return -EINVAL;
1314 	}
1315 
1316 	sta_dbg(sta->sdata, "moving STA %pM to state %d\n",
1317 		sta->sta.addr, new_state);
1318 
1319 	/* notify the driver before the actual changes so it can
1320 	 * fail the transition
1321 	 */
1322 	if (test_sta_flag(sta, WLAN_STA_INSERTED)) {
1323 		int err = drv_sta_state(sta->local, sta->sdata, sta,
1324 					sta->sta_state, new_state);
1325 		if (err)
1326 			return err;
1327 	}
1328 
1329 	/* reflect the change in all state variables */
1330 
1331 	switch (new_state) {
1332 	case IEEE80211_STA_NONE:
1333 		if (sta->sta_state == IEEE80211_STA_AUTH)
1334 			clear_bit(WLAN_STA_AUTH, &sta->_flags);
1335 		break;
1336 	case IEEE80211_STA_AUTH:
1337 		if (sta->sta_state == IEEE80211_STA_NONE) {
1338 			set_bit(WLAN_STA_AUTH, &sta->_flags);
1339 		} else if (sta->sta_state == IEEE80211_STA_ASSOC) {
1340 			clear_bit(WLAN_STA_ASSOC, &sta->_flags);
1341 			if (recalc) {
1342 				ieee80211_recalc_min_chandef(sta->sdata, -1);
1343 				if (!sta->sta.support_p2p_ps)
1344 					ieee80211_recalc_p2p_go_ps_allowed(sta->sdata);
1345 			}
1346 		}
1347 		break;
1348 	case IEEE80211_STA_ASSOC:
1349 		if (sta->sta_state == IEEE80211_STA_AUTH) {
1350 			set_bit(WLAN_STA_ASSOC, &sta->_flags);
1351 			sta->assoc_at = ktime_get_boottime_ns();
1352 			if (recalc) {
1353 				ieee80211_recalc_min_chandef(sta->sdata, -1);
1354 				if (!sta->sta.support_p2p_ps)
1355 					ieee80211_recalc_p2p_go_ps_allowed(sta->sdata);
1356 			}
1357 		} else if (sta->sta_state == IEEE80211_STA_AUTHORIZED) {
1358 			ieee80211_vif_dec_num_mcast(sta->sdata);
1359 			clear_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1360 
1361 			/*
1362 			 * If we have encryption offload, flush (station) queues
1363 			 * (after ensuring concurrent TX completed) so we won't
1364 			 * transmit anything later unencrypted if/when keys are
1365 			 * also removed, which might otherwise happen depending
1366 			 * on how the hardware offload works.
1367 			 */
1368 			if (local->ops->set_key) {
1369 				synchronize_net();
1370 				if (local->ops->flush_sta)
1371 					drv_flush_sta(local, sta->sdata, sta);
1372 				else
1373 					ieee80211_flush_queues(local,
1374 							       sta->sdata,
1375 							       false);
1376 			}
1377 
1378 			ieee80211_clear_fast_xmit(sta);
1379 			ieee80211_clear_fast_rx(sta);
1380 		}
1381 		break;
1382 	case IEEE80211_STA_AUTHORIZED:
1383 		if (sta->sta_state == IEEE80211_STA_ASSOC) {
1384 			ieee80211_vif_inc_num_mcast(sta->sdata);
1385 			set_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1386 			ieee80211_check_fast_xmit(sta);
1387 			ieee80211_check_fast_rx(sta);
1388 		}
1389 		if (sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1390 		    sta->sdata->vif.type == NL80211_IFTYPE_AP)
1391 			cfg80211_send_layer2_update(sta->sdata->dev,
1392 						    sta->sta.addr);
1393 		break;
1394 	default:
1395 		break;
1396 	}
1397 
1398 	sta->sta_state = new_state;
1399 
1400 	return 0;
1401 }
1402 
1403 int sta_info_move_state(struct sta_info *sta,
1404 			enum ieee80211_sta_state new_state)
1405 {
1406 	return _sta_info_move_state(sta, new_state, true);
1407 }
1408 
1409 static void __sta_info_destroy_part2(struct sta_info *sta, bool recalc)
1410 {
1411 	struct ieee80211_local *local = sta->local;
1412 	struct ieee80211_sub_if_data *sdata = sta->sdata;
1413 	struct station_info *sinfo;
1414 	int ret;
1415 
1416 	/*
1417 	 * NOTE: This assumes at least synchronize_net() was done
1418 	 *	 after _part1 and before _part2!
1419 	 */
1420 
1421 	/*
1422 	 * There's a potential race in _part1 where we set WLAN_STA_BLOCK_BA
1423 	 * but someone might have just gotten past a check, and not yet into
1424 	 * queuing the work/creating the data/etc.
1425 	 *
1426 	 * Do another round of destruction so that the worker is certainly
1427 	 * canceled before we later free the station.
1428 	 *
1429 	 * Since this is after synchronize_rcu()/synchronize_net() we're now
1430 	 * certain that nobody can actually hold a reference to the STA and
1431 	 * be calling e.g. ieee80211_start_tx_ba_session().
1432 	 */
1433 	ieee80211_sta_tear_down_BA_sessions(sta, AGG_STOP_DESTROY_STA);
1434 
1435 	might_sleep();
1436 	lockdep_assert_wiphy(local->hw.wiphy);
1437 
1438 	if (sta->sta_state == IEEE80211_STA_AUTHORIZED) {
1439 		ret = _sta_info_move_state(sta, IEEE80211_STA_ASSOC, recalc);
1440 		WARN_ON_ONCE(ret);
1441 	}
1442 
1443 	/* now keys can no longer be reached */
1444 	ieee80211_free_sta_keys(local, sta);
1445 
1446 	/* disable TIM bit - last chance to tell driver */
1447 	__sta_info_recalc_tim(sta, true);
1448 
1449 	sta->dead = true;
1450 
1451 	local->num_sta--;
1452 	local->sta_generation++;
1453 
1454 	while (sta->sta_state > IEEE80211_STA_NONE) {
1455 		ret = _sta_info_move_state(sta, sta->sta_state - 1, recalc);
1456 		if (ret) {
1457 			WARN_ON_ONCE(1);
1458 			break;
1459 		}
1460 	}
1461 
1462 	if (sta->uploaded) {
1463 		ret = drv_sta_state(local, sdata, sta, IEEE80211_STA_NONE,
1464 				    IEEE80211_STA_NOTEXIST);
1465 		WARN_ON_ONCE(ret != 0);
1466 	}
1467 
1468 	sta_dbg(sdata, "Removed STA %pM\n", sta->sta.addr);
1469 
1470 	sinfo = kzalloc(sizeof(*sinfo), GFP_KERNEL);
1471 	if (sinfo)
1472 		sta_set_sinfo(sta, sinfo, true);
1473 	cfg80211_del_sta_sinfo(sdata->dev, sta->sta.addr, sinfo, GFP_KERNEL);
1474 	kfree(sinfo);
1475 
1476 	ieee80211_sta_debugfs_remove(sta);
1477 
1478 	ieee80211_destroy_frag_cache(&sta->frags);
1479 
1480 	cleanup_single_sta(sta);
1481 }
1482 
1483 int __must_check __sta_info_destroy(struct sta_info *sta)
1484 {
1485 	int err = __sta_info_destroy_part1(sta);
1486 
1487 	if (err)
1488 		return err;
1489 
1490 	synchronize_net();
1491 
1492 	__sta_info_destroy_part2(sta, true);
1493 
1494 	return 0;
1495 }
1496 
1497 int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr)
1498 {
1499 	struct sta_info *sta;
1500 
1501 	lockdep_assert_wiphy(sdata->local->hw.wiphy);
1502 
1503 	sta = sta_info_get(sdata, addr);
1504 	return __sta_info_destroy(sta);
1505 }
1506 
1507 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
1508 			      const u8 *addr)
1509 {
1510 	struct sta_info *sta;
1511 
1512 	lockdep_assert_wiphy(sdata->local->hw.wiphy);
1513 
1514 	sta = sta_info_get_bss(sdata, addr);
1515 	return __sta_info_destroy(sta);
1516 }
1517 
1518 static void sta_info_cleanup(struct timer_list *t)
1519 {
1520 	struct ieee80211_local *local = from_timer(local, t, sta_cleanup);
1521 	struct sta_info *sta;
1522 	bool timer_needed = false;
1523 
1524 	rcu_read_lock();
1525 	list_for_each_entry_rcu(sta, &local->sta_list, list)
1526 		if (sta_info_cleanup_expire_buffered(local, sta))
1527 			timer_needed = true;
1528 	rcu_read_unlock();
1529 
1530 	if (local->quiescing)
1531 		return;
1532 
1533 	if (!timer_needed)
1534 		return;
1535 
1536 	mod_timer(&local->sta_cleanup,
1537 		  round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL));
1538 }
1539 
1540 int sta_info_init(struct ieee80211_local *local)
1541 {
1542 	int err;
1543 
1544 	err = rhltable_init(&local->sta_hash, &sta_rht_params);
1545 	if (err)
1546 		return err;
1547 
1548 	err = rhltable_init(&local->link_sta_hash, &link_sta_rht_params);
1549 	if (err) {
1550 		rhltable_destroy(&local->sta_hash);
1551 		return err;
1552 	}
1553 
1554 	spin_lock_init(&local->tim_lock);
1555 	INIT_LIST_HEAD(&local->sta_list);
1556 
1557 	timer_setup(&local->sta_cleanup, sta_info_cleanup, 0);
1558 	return 0;
1559 }
1560 
1561 void sta_info_stop(struct ieee80211_local *local)
1562 {
1563 	del_timer_sync(&local->sta_cleanup);
1564 	rhltable_destroy(&local->sta_hash);
1565 	rhltable_destroy(&local->link_sta_hash);
1566 }
1567 
1568 
1569 int __sta_info_flush(struct ieee80211_sub_if_data *sdata, bool vlans,
1570 		     int link_id)
1571 {
1572 	struct ieee80211_local *local = sdata->local;
1573 	struct sta_info *sta, *tmp;
1574 	LIST_HEAD(free_list);
1575 	int ret = 0;
1576 
1577 	might_sleep();
1578 	lockdep_assert_wiphy(local->hw.wiphy);
1579 
1580 	WARN_ON(vlans && sdata->vif.type != NL80211_IFTYPE_AP);
1581 	WARN_ON(vlans && !sdata->bss);
1582 
1583 	list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1584 		if (sdata != sta->sdata &&
1585 		    (!vlans || sdata->bss != sta->sdata->bss))
1586 			continue;
1587 
1588 		if (link_id >= 0 && sta->sta.valid_links &&
1589 		    !(sta->sta.valid_links & BIT(link_id)))
1590 			continue;
1591 
1592 		if (!WARN_ON(__sta_info_destroy_part1(sta)))
1593 			list_add(&sta->free_list, &free_list);
1594 
1595 		ret++;
1596 	}
1597 
1598 	if (!list_empty(&free_list)) {
1599 		bool support_p2p_ps = true;
1600 
1601 		synchronize_net();
1602 		list_for_each_entry_safe(sta, tmp, &free_list, free_list) {
1603 			if (!sta->sta.support_p2p_ps)
1604 				support_p2p_ps = false;
1605 			__sta_info_destroy_part2(sta, false);
1606 		}
1607 
1608 		ieee80211_recalc_min_chandef(sdata, -1);
1609 		if (!support_p2p_ps)
1610 			ieee80211_recalc_p2p_go_ps_allowed(sdata);
1611 	}
1612 
1613 	return ret;
1614 }
1615 
1616 void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
1617 			  unsigned long exp_time)
1618 {
1619 	struct ieee80211_local *local = sdata->local;
1620 	struct sta_info *sta, *tmp;
1621 
1622 	lockdep_assert_wiphy(local->hw.wiphy);
1623 
1624 	list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1625 		unsigned long last_active = ieee80211_sta_last_active(sta);
1626 
1627 		if (sdata != sta->sdata)
1628 			continue;
1629 
1630 		if (time_is_before_jiffies(last_active + exp_time)) {
1631 			sta_dbg(sta->sdata, "expiring inactive STA %pM\n",
1632 				sta->sta.addr);
1633 
1634 			if (ieee80211_vif_is_mesh(&sdata->vif) &&
1635 			    test_sta_flag(sta, WLAN_STA_PS_STA))
1636 				atomic_dec(&sdata->u.mesh.ps.num_sta_ps);
1637 
1638 			WARN_ON(__sta_info_destroy(sta));
1639 		}
1640 	}
1641 }
1642 
1643 struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw,
1644 						   const u8 *addr,
1645 						   const u8 *localaddr)
1646 {
1647 	struct ieee80211_local *local = hw_to_local(hw);
1648 	struct rhlist_head *tmp;
1649 	struct sta_info *sta;
1650 
1651 	/*
1652 	 * Just return a random station if localaddr is NULL
1653 	 * ... first in list.
1654 	 */
1655 	for_each_sta_info(local, addr, sta, tmp) {
1656 		if (localaddr &&
1657 		    !ether_addr_equal(sta->sdata->vif.addr, localaddr))
1658 			continue;
1659 		if (!sta->uploaded)
1660 			return NULL;
1661 		return &sta->sta;
1662 	}
1663 
1664 	return NULL;
1665 }
1666 EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr);
1667 
1668 struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif,
1669 					 const u8 *addr)
1670 {
1671 	struct sta_info *sta;
1672 
1673 	if (!vif)
1674 		return NULL;
1675 
1676 	sta = sta_info_get_bss(vif_to_sdata(vif), addr);
1677 	if (!sta)
1678 		return NULL;
1679 
1680 	if (!sta->uploaded)
1681 		return NULL;
1682 
1683 	return &sta->sta;
1684 }
1685 EXPORT_SYMBOL(ieee80211_find_sta);
1686 
1687 /* powersave support code */
1688 void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta)
1689 {
1690 	struct ieee80211_sub_if_data *sdata = sta->sdata;
1691 	struct ieee80211_local *local = sdata->local;
1692 	struct sk_buff_head pending;
1693 	int filtered = 0, buffered = 0, ac, i;
1694 	unsigned long flags;
1695 	struct ps_data *ps;
1696 
1697 	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1698 		sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
1699 				     u.ap);
1700 
1701 	if (sdata->vif.type == NL80211_IFTYPE_AP)
1702 		ps = &sdata->bss->ps;
1703 	else if (ieee80211_vif_is_mesh(&sdata->vif))
1704 		ps = &sdata->u.mesh.ps;
1705 	else
1706 		return;
1707 
1708 	clear_sta_flag(sta, WLAN_STA_SP);
1709 
1710 	BUILD_BUG_ON(BITS_TO_LONGS(IEEE80211_NUM_TIDS) > 1);
1711 	sta->driver_buffered_tids = 0;
1712 	sta->txq_buffered_tids = 0;
1713 
1714 	if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1715 		drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta);
1716 
1717 	for (i = 0; i < ARRAY_SIZE(sta->sta.txq); i++) {
1718 		if (!sta->sta.txq[i] || !txq_has_queue(sta->sta.txq[i]))
1719 			continue;
1720 
1721 		schedule_and_wake_txq(local, to_txq_info(sta->sta.txq[i]));
1722 	}
1723 
1724 	skb_queue_head_init(&pending);
1725 
1726 	/* sync with ieee80211_tx_h_unicast_ps_buf */
1727 	spin_lock_bh(&sta->ps_lock);
1728 	/* Send all buffered frames to the station */
1729 	for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1730 		int count = skb_queue_len(&pending), tmp;
1731 
1732 		spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
1733 		skb_queue_splice_tail_init(&sta->tx_filtered[ac], &pending);
1734 		spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
1735 		tmp = skb_queue_len(&pending);
1736 		filtered += tmp - count;
1737 		count = tmp;
1738 
1739 		spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
1740 		skb_queue_splice_tail_init(&sta->ps_tx_buf[ac], &pending);
1741 		spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
1742 		tmp = skb_queue_len(&pending);
1743 		buffered += tmp - count;
1744 	}
1745 
1746 	ieee80211_add_pending_skbs(local, &pending);
1747 
1748 	/* now we're no longer in the deliver code */
1749 	clear_sta_flag(sta, WLAN_STA_PS_DELIVER);
1750 
1751 	/* The station might have polled and then woken up before we responded,
1752 	 * so clear these flags now to avoid them sticking around.
1753 	 */
1754 	clear_sta_flag(sta, WLAN_STA_PSPOLL);
1755 	clear_sta_flag(sta, WLAN_STA_UAPSD);
1756 	spin_unlock_bh(&sta->ps_lock);
1757 
1758 	atomic_dec(&ps->num_sta_ps);
1759 
1760 	local->total_ps_buffered -= buffered;
1761 
1762 	sta_info_recalc_tim(sta);
1763 
1764 	ps_dbg(sdata,
1765 	       "STA %pM aid %d sending %d filtered/%d PS frames since STA woke up\n",
1766 	       sta->sta.addr, sta->sta.aid, filtered, buffered);
1767 
1768 	ieee80211_check_fast_xmit(sta);
1769 }
1770 
1771 static void ieee80211_send_null_response(struct sta_info *sta, int tid,
1772 					 enum ieee80211_frame_release_type reason,
1773 					 bool call_driver, bool more_data)
1774 {
1775 	struct ieee80211_sub_if_data *sdata = sta->sdata;
1776 	struct ieee80211_local *local = sdata->local;
1777 	struct ieee80211_qos_hdr *nullfunc;
1778 	struct sk_buff *skb;
1779 	int size = sizeof(*nullfunc);
1780 	__le16 fc;
1781 	bool qos = sta->sta.wme;
1782 	struct ieee80211_tx_info *info;
1783 	struct ieee80211_chanctx_conf *chanctx_conf;
1784 
1785 	if (qos) {
1786 		fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1787 				 IEEE80211_STYPE_QOS_NULLFUNC |
1788 				 IEEE80211_FCTL_FROMDS);
1789 	} else {
1790 		size -= 2;
1791 		fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1792 				 IEEE80211_STYPE_NULLFUNC |
1793 				 IEEE80211_FCTL_FROMDS);
1794 	}
1795 
1796 	skb = dev_alloc_skb(local->hw.extra_tx_headroom + size);
1797 	if (!skb)
1798 		return;
1799 
1800 	skb_reserve(skb, local->hw.extra_tx_headroom);
1801 
1802 	nullfunc = skb_put(skb, size);
1803 	nullfunc->frame_control = fc;
1804 	nullfunc->duration_id = 0;
1805 	memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN);
1806 	memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
1807 	memcpy(nullfunc->addr3, sdata->vif.addr, ETH_ALEN);
1808 	nullfunc->seq_ctrl = 0;
1809 
1810 	skb->priority = tid;
1811 	skb_set_queue_mapping(skb, ieee802_1d_to_ac[tid]);
1812 	if (qos) {
1813 		nullfunc->qos_ctrl = cpu_to_le16(tid);
1814 
1815 		if (reason == IEEE80211_FRAME_RELEASE_UAPSD) {
1816 			nullfunc->qos_ctrl |=
1817 				cpu_to_le16(IEEE80211_QOS_CTL_EOSP);
1818 			if (more_data)
1819 				nullfunc->frame_control |=
1820 					cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1821 		}
1822 	}
1823 
1824 	info = IEEE80211_SKB_CB(skb);
1825 
1826 	/*
1827 	 * Tell TX path to send this frame even though the
1828 	 * STA may still remain is PS mode after this frame
1829 	 * exchange. Also set EOSP to indicate this packet
1830 	 * ends the poll/service period.
1831 	 */
1832 	info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER |
1833 		       IEEE80211_TX_STATUS_EOSP |
1834 		       IEEE80211_TX_CTL_REQ_TX_STATUS;
1835 
1836 	info->control.flags |= IEEE80211_TX_CTRL_PS_RESPONSE;
1837 
1838 	if (call_driver)
1839 		drv_allow_buffered_frames(local, sta, BIT(tid), 1,
1840 					  reason, false);
1841 
1842 	skb->dev = sdata->dev;
1843 
1844 	rcu_read_lock();
1845 	chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
1846 	if (WARN_ON(!chanctx_conf)) {
1847 		rcu_read_unlock();
1848 		kfree_skb(skb);
1849 		return;
1850 	}
1851 
1852 	info->band = chanctx_conf->def.chan->band;
1853 	ieee80211_xmit(sdata, sta, skb);
1854 	rcu_read_unlock();
1855 }
1856 
1857 static int find_highest_prio_tid(unsigned long tids)
1858 {
1859 	/* lower 3 TIDs aren't ordered perfectly */
1860 	if (tids & 0xF8)
1861 		return fls(tids) - 1;
1862 	/* TID 0 is BE just like TID 3 */
1863 	if (tids & BIT(0))
1864 		return 0;
1865 	return fls(tids) - 1;
1866 }
1867 
1868 /* Indicates if the MORE_DATA bit should be set in the last
1869  * frame obtained by ieee80211_sta_ps_get_frames.
1870  * Note that driver_release_tids is relevant only if
1871  * reason = IEEE80211_FRAME_RELEASE_PSPOLL
1872  */
1873 static bool
1874 ieee80211_sta_ps_more_data(struct sta_info *sta, u8 ignored_acs,
1875 			   enum ieee80211_frame_release_type reason,
1876 			   unsigned long driver_release_tids)
1877 {
1878 	int ac;
1879 
1880 	/* If the driver has data on more than one TID then
1881 	 * certainly there's more data if we release just a
1882 	 * single frame now (from a single TID). This will
1883 	 * only happen for PS-Poll.
1884 	 */
1885 	if (reason == IEEE80211_FRAME_RELEASE_PSPOLL &&
1886 	    hweight16(driver_release_tids) > 1)
1887 		return true;
1888 
1889 	for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1890 		if (ignored_acs & ieee80211_ac_to_qos_mask[ac])
1891 			continue;
1892 
1893 		if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
1894 		    !skb_queue_empty(&sta->ps_tx_buf[ac]))
1895 			return true;
1896 	}
1897 
1898 	return false;
1899 }
1900 
1901 static void
1902 ieee80211_sta_ps_get_frames(struct sta_info *sta, int n_frames, u8 ignored_acs,
1903 			    enum ieee80211_frame_release_type reason,
1904 			    struct sk_buff_head *frames,
1905 			    unsigned long *driver_release_tids)
1906 {
1907 	struct ieee80211_sub_if_data *sdata = sta->sdata;
1908 	struct ieee80211_local *local = sdata->local;
1909 	int ac;
1910 
1911 	/* Get response frame(s) and more data bit for the last one. */
1912 	for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1913 		unsigned long tids;
1914 
1915 		if (ignored_acs & ieee80211_ac_to_qos_mask[ac])
1916 			continue;
1917 
1918 		tids = ieee80211_tids_for_ac(ac);
1919 
1920 		/* if we already have frames from software, then we can't also
1921 		 * release from hardware queues
1922 		 */
1923 		if (skb_queue_empty(frames)) {
1924 			*driver_release_tids |=
1925 				sta->driver_buffered_tids & tids;
1926 			*driver_release_tids |= sta->txq_buffered_tids & tids;
1927 		}
1928 
1929 		if (!*driver_release_tids) {
1930 			struct sk_buff *skb;
1931 
1932 			while (n_frames > 0) {
1933 				skb = skb_dequeue(&sta->tx_filtered[ac]);
1934 				if (!skb) {
1935 					skb = skb_dequeue(
1936 						&sta->ps_tx_buf[ac]);
1937 					if (skb)
1938 						local->total_ps_buffered--;
1939 				}
1940 				if (!skb)
1941 					break;
1942 				n_frames--;
1943 				__skb_queue_tail(frames, skb);
1944 			}
1945 		}
1946 
1947 		/* If we have more frames buffered on this AC, then abort the
1948 		 * loop since we can't send more data from other ACs before
1949 		 * the buffered frames from this.
1950 		 */
1951 		if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
1952 		    !skb_queue_empty(&sta->ps_tx_buf[ac]))
1953 			break;
1954 	}
1955 }
1956 
1957 static void
1958 ieee80211_sta_ps_deliver_response(struct sta_info *sta,
1959 				  int n_frames, u8 ignored_acs,
1960 				  enum ieee80211_frame_release_type reason)
1961 {
1962 	struct ieee80211_sub_if_data *sdata = sta->sdata;
1963 	struct ieee80211_local *local = sdata->local;
1964 	unsigned long driver_release_tids = 0;
1965 	struct sk_buff_head frames;
1966 	bool more_data;
1967 
1968 	/* Service or PS-Poll period starts */
1969 	set_sta_flag(sta, WLAN_STA_SP);
1970 
1971 	__skb_queue_head_init(&frames);
1972 
1973 	ieee80211_sta_ps_get_frames(sta, n_frames, ignored_acs, reason,
1974 				    &frames, &driver_release_tids);
1975 
1976 	more_data = ieee80211_sta_ps_more_data(sta, ignored_acs, reason, driver_release_tids);
1977 
1978 	if (driver_release_tids && reason == IEEE80211_FRAME_RELEASE_PSPOLL)
1979 		driver_release_tids =
1980 			BIT(find_highest_prio_tid(driver_release_tids));
1981 
1982 	if (skb_queue_empty(&frames) && !driver_release_tids) {
1983 		int tid, ac;
1984 
1985 		/*
1986 		 * For PS-Poll, this can only happen due to a race condition
1987 		 * when we set the TIM bit and the station notices it, but
1988 		 * before it can poll for the frame we expire it.
1989 		 *
1990 		 * For uAPSD, this is said in the standard (11.2.1.5 h):
1991 		 *	At each unscheduled SP for a non-AP STA, the AP shall
1992 		 *	attempt to transmit at least one MSDU or MMPDU, but no
1993 		 *	more than the value specified in the Max SP Length field
1994 		 *	in the QoS Capability element from delivery-enabled ACs,
1995 		 *	that are destined for the non-AP STA.
1996 		 *
1997 		 * Since we have no other MSDU/MMPDU, transmit a QoS null frame.
1998 		 */
1999 
2000 		/* This will evaluate to 1, 3, 5 or 7. */
2001 		for (ac = IEEE80211_AC_VO; ac < IEEE80211_NUM_ACS; ac++)
2002 			if (!(ignored_acs & ieee80211_ac_to_qos_mask[ac]))
2003 				break;
2004 		tid = 7 - 2 * ac;
2005 
2006 		ieee80211_send_null_response(sta, tid, reason, true, false);
2007 	} else if (!driver_release_tids) {
2008 		struct sk_buff_head pending;
2009 		struct sk_buff *skb;
2010 		int num = 0;
2011 		u16 tids = 0;
2012 		bool need_null = false;
2013 
2014 		skb_queue_head_init(&pending);
2015 
2016 		while ((skb = __skb_dequeue(&frames))) {
2017 			struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2018 			struct ieee80211_hdr *hdr = (void *) skb->data;
2019 			u8 *qoshdr = NULL;
2020 
2021 			num++;
2022 
2023 			/*
2024 			 * Tell TX path to send this frame even though the
2025 			 * STA may still remain is PS mode after this frame
2026 			 * exchange.
2027 			 */
2028 			info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
2029 			info->control.flags |= IEEE80211_TX_CTRL_PS_RESPONSE;
2030 
2031 			/*
2032 			 * Use MoreData flag to indicate whether there are
2033 			 * more buffered frames for this STA
2034 			 */
2035 			if (more_data || !skb_queue_empty(&frames))
2036 				hdr->frame_control |=
2037 					cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2038 			else
2039 				hdr->frame_control &=
2040 					cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
2041 
2042 			if (ieee80211_is_data_qos(hdr->frame_control) ||
2043 			    ieee80211_is_qos_nullfunc(hdr->frame_control))
2044 				qoshdr = ieee80211_get_qos_ctl(hdr);
2045 
2046 			tids |= BIT(skb->priority);
2047 
2048 			__skb_queue_tail(&pending, skb);
2049 
2050 			/* end service period after last frame or add one */
2051 			if (!skb_queue_empty(&frames))
2052 				continue;
2053 
2054 			if (reason != IEEE80211_FRAME_RELEASE_UAPSD) {
2055 				/* for PS-Poll, there's only one frame */
2056 				info->flags |= IEEE80211_TX_STATUS_EOSP |
2057 					       IEEE80211_TX_CTL_REQ_TX_STATUS;
2058 				break;
2059 			}
2060 
2061 			/* For uAPSD, things are a bit more complicated. If the
2062 			 * last frame has a QoS header (i.e. is a QoS-data or
2063 			 * QoS-nulldata frame) then just set the EOSP bit there
2064 			 * and be done.
2065 			 * If the frame doesn't have a QoS header (which means
2066 			 * it should be a bufferable MMPDU) then we can't set
2067 			 * the EOSP bit in the QoS header; add a QoS-nulldata
2068 			 * frame to the list to send it after the MMPDU.
2069 			 *
2070 			 * Note that this code is only in the mac80211-release
2071 			 * code path, we assume that the driver will not buffer
2072 			 * anything but QoS-data frames, or if it does, will
2073 			 * create the QoS-nulldata frame by itself if needed.
2074 			 *
2075 			 * Cf. 802.11-2012 10.2.1.10 (c).
2076 			 */
2077 			if (qoshdr) {
2078 				*qoshdr |= IEEE80211_QOS_CTL_EOSP;
2079 
2080 				info->flags |= IEEE80211_TX_STATUS_EOSP |
2081 					       IEEE80211_TX_CTL_REQ_TX_STATUS;
2082 			} else {
2083 				/* The standard isn't completely clear on this
2084 				 * as it says the more-data bit should be set
2085 				 * if there are more BUs. The QoS-Null frame
2086 				 * we're about to send isn't buffered yet, we
2087 				 * only create it below, but let's pretend it
2088 				 * was buffered just in case some clients only
2089 				 * expect more-data=0 when eosp=1.
2090 				 */
2091 				hdr->frame_control |=
2092 					cpu_to_le16(IEEE80211_FCTL_MOREDATA);
2093 				need_null = true;
2094 				num++;
2095 			}
2096 			break;
2097 		}
2098 
2099 		drv_allow_buffered_frames(local, sta, tids, num,
2100 					  reason, more_data);
2101 
2102 		ieee80211_add_pending_skbs(local, &pending);
2103 
2104 		if (need_null)
2105 			ieee80211_send_null_response(
2106 				sta, find_highest_prio_tid(tids),
2107 				reason, false, false);
2108 
2109 		sta_info_recalc_tim(sta);
2110 	} else {
2111 		int tid;
2112 
2113 		/*
2114 		 * We need to release a frame that is buffered somewhere in the
2115 		 * driver ... it'll have to handle that.
2116 		 * Note that the driver also has to check the number of frames
2117 		 * on the TIDs we're releasing from - if there are more than
2118 		 * n_frames it has to set the more-data bit (if we didn't ask
2119 		 * it to set it anyway due to other buffered frames); if there
2120 		 * are fewer than n_frames it has to make sure to adjust that
2121 		 * to allow the service period to end properly.
2122 		 */
2123 		drv_release_buffered_frames(local, sta, driver_release_tids,
2124 					    n_frames, reason, more_data);
2125 
2126 		/*
2127 		 * Note that we don't recalculate the TIM bit here as it would
2128 		 * most likely have no effect at all unless the driver told us
2129 		 * that the TID(s) became empty before returning here from the
2130 		 * release function.
2131 		 * Either way, however, when the driver tells us that the TID(s)
2132 		 * became empty or we find that a txq became empty, we'll do the
2133 		 * TIM recalculation.
2134 		 */
2135 
2136 		for (tid = 0; tid < ARRAY_SIZE(sta->sta.txq); tid++) {
2137 			if (!sta->sta.txq[tid] ||
2138 			    !(driver_release_tids & BIT(tid)) ||
2139 			    txq_has_queue(sta->sta.txq[tid]))
2140 				continue;
2141 
2142 			sta_info_recalc_tim(sta);
2143 			break;
2144 		}
2145 	}
2146 }
2147 
2148 void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta)
2149 {
2150 	u8 ignore_for_response = sta->sta.uapsd_queues;
2151 
2152 	/*
2153 	 * If all ACs are delivery-enabled then we should reply
2154 	 * from any of them, if only some are enabled we reply
2155 	 * only from the non-enabled ones.
2156 	 */
2157 	if (ignore_for_response == BIT(IEEE80211_NUM_ACS) - 1)
2158 		ignore_for_response = 0;
2159 
2160 	ieee80211_sta_ps_deliver_response(sta, 1, ignore_for_response,
2161 					  IEEE80211_FRAME_RELEASE_PSPOLL);
2162 }
2163 
2164 void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta)
2165 {
2166 	int n_frames = sta->sta.max_sp;
2167 	u8 delivery_enabled = sta->sta.uapsd_queues;
2168 
2169 	/*
2170 	 * If we ever grow support for TSPEC this might happen if
2171 	 * the TSPEC update from hostapd comes in between a trigger
2172 	 * frame setting WLAN_STA_UAPSD in the RX path and this
2173 	 * actually getting called.
2174 	 */
2175 	if (!delivery_enabled)
2176 		return;
2177 
2178 	switch (sta->sta.max_sp) {
2179 	case 1:
2180 		n_frames = 2;
2181 		break;
2182 	case 2:
2183 		n_frames = 4;
2184 		break;
2185 	case 3:
2186 		n_frames = 6;
2187 		break;
2188 	case 0:
2189 		/* XXX: what is a good value? */
2190 		n_frames = 128;
2191 		break;
2192 	}
2193 
2194 	ieee80211_sta_ps_deliver_response(sta, n_frames, ~delivery_enabled,
2195 					  IEEE80211_FRAME_RELEASE_UAPSD);
2196 }
2197 
2198 void ieee80211_sta_block_awake(struct ieee80211_hw *hw,
2199 			       struct ieee80211_sta *pubsta, bool block)
2200 {
2201 	struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
2202 
2203 	trace_api_sta_block_awake(sta->local, pubsta, block);
2204 
2205 	if (block) {
2206 		set_sta_flag(sta, WLAN_STA_PS_DRIVER);
2207 		ieee80211_clear_fast_xmit(sta);
2208 		return;
2209 	}
2210 
2211 	if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
2212 		return;
2213 
2214 	if (!test_sta_flag(sta, WLAN_STA_PS_STA)) {
2215 		set_sta_flag(sta, WLAN_STA_PS_DELIVER);
2216 		clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
2217 		ieee80211_queue_work(hw, &sta->drv_deliver_wk);
2218 	} else if (test_sta_flag(sta, WLAN_STA_PSPOLL) ||
2219 		   test_sta_flag(sta, WLAN_STA_UAPSD)) {
2220 		/* must be asleep in this case */
2221 		clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
2222 		ieee80211_queue_work(hw, &sta->drv_deliver_wk);
2223 	} else {
2224 		clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
2225 		ieee80211_check_fast_xmit(sta);
2226 	}
2227 }
2228 EXPORT_SYMBOL(ieee80211_sta_block_awake);
2229 
2230 void ieee80211_sta_eosp(struct ieee80211_sta *pubsta)
2231 {
2232 	struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
2233 	struct ieee80211_local *local = sta->local;
2234 
2235 	trace_api_eosp(local, pubsta);
2236 
2237 	clear_sta_flag(sta, WLAN_STA_SP);
2238 }
2239 EXPORT_SYMBOL(ieee80211_sta_eosp);
2240 
2241 void ieee80211_send_eosp_nullfunc(struct ieee80211_sta *pubsta, int tid)
2242 {
2243 	struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
2244 	enum ieee80211_frame_release_type reason;
2245 	bool more_data;
2246 
2247 	trace_api_send_eosp_nullfunc(sta->local, pubsta, tid);
2248 
2249 	reason = IEEE80211_FRAME_RELEASE_UAPSD;
2250 	more_data = ieee80211_sta_ps_more_data(sta, ~sta->sta.uapsd_queues,
2251 					       reason, 0);
2252 
2253 	ieee80211_send_null_response(sta, tid, reason, false, more_data);
2254 }
2255 EXPORT_SYMBOL(ieee80211_send_eosp_nullfunc);
2256 
2257 void ieee80211_sta_set_buffered(struct ieee80211_sta *pubsta,
2258 				u8 tid, bool buffered)
2259 {
2260 	struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
2261 
2262 	if (WARN_ON(tid >= IEEE80211_NUM_TIDS))
2263 		return;
2264 
2265 	trace_api_sta_set_buffered(sta->local, pubsta, tid, buffered);
2266 
2267 	if (buffered)
2268 		set_bit(tid, &sta->driver_buffered_tids);
2269 	else
2270 		clear_bit(tid, &sta->driver_buffered_tids);
2271 
2272 	sta_info_recalc_tim(sta);
2273 }
2274 EXPORT_SYMBOL(ieee80211_sta_set_buffered);
2275 
2276 void ieee80211_sta_register_airtime(struct ieee80211_sta *pubsta, u8 tid,
2277 				    u32 tx_airtime, u32 rx_airtime)
2278 {
2279 	struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
2280 	struct ieee80211_local *local = sta->sdata->local;
2281 	u8 ac = ieee80211_ac_from_tid(tid);
2282 	u32 airtime = 0;
2283 
2284 	if (sta->local->airtime_flags & AIRTIME_USE_TX)
2285 		airtime += tx_airtime;
2286 	if (sta->local->airtime_flags & AIRTIME_USE_RX)
2287 		airtime += rx_airtime;
2288 
2289 	spin_lock_bh(&local->active_txq_lock[ac]);
2290 	sta->airtime[ac].tx_airtime += tx_airtime;
2291 	sta->airtime[ac].rx_airtime += rx_airtime;
2292 
2293 	if (ieee80211_sta_keep_active(sta, ac))
2294 		sta->airtime[ac].deficit -= airtime;
2295 
2296 	spin_unlock_bh(&local->active_txq_lock[ac]);
2297 }
2298 EXPORT_SYMBOL(ieee80211_sta_register_airtime);
2299 
2300 void __ieee80211_sta_recalc_aggregates(struct sta_info *sta, u16 active_links)
2301 {
2302 	bool first = true;
2303 	int link_id;
2304 
2305 	if (!sta->sta.valid_links || !sta->sta.mlo) {
2306 		sta->sta.cur = &sta->sta.deflink.agg;
2307 		return;
2308 	}
2309 
2310 	rcu_read_lock();
2311 	for (link_id = 0; link_id < ARRAY_SIZE((sta)->link); link_id++) {
2312 		struct ieee80211_link_sta *link_sta;
2313 		int i;
2314 
2315 		if (!(active_links & BIT(link_id)))
2316 			continue;
2317 
2318 		link_sta = rcu_dereference(sta->sta.link[link_id]);
2319 		if (!link_sta)
2320 			continue;
2321 
2322 		if (first) {
2323 			sta->cur = sta->sta.deflink.agg;
2324 			first = false;
2325 			continue;
2326 		}
2327 
2328 		sta->cur.max_amsdu_len =
2329 			min(sta->cur.max_amsdu_len,
2330 			    link_sta->agg.max_amsdu_len);
2331 		sta->cur.max_rc_amsdu_len =
2332 			min(sta->cur.max_rc_amsdu_len,
2333 			    link_sta->agg.max_rc_amsdu_len);
2334 
2335 		for (i = 0; i < ARRAY_SIZE(sta->cur.max_tid_amsdu_len); i++)
2336 			sta->cur.max_tid_amsdu_len[i] =
2337 				min(sta->cur.max_tid_amsdu_len[i],
2338 				    link_sta->agg.max_tid_amsdu_len[i]);
2339 	}
2340 	rcu_read_unlock();
2341 
2342 	sta->sta.cur = &sta->cur;
2343 }
2344 
2345 void ieee80211_sta_recalc_aggregates(struct ieee80211_sta *pubsta)
2346 {
2347 	struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
2348 
2349 	__ieee80211_sta_recalc_aggregates(sta, sta->sdata->vif.active_links);
2350 }
2351 EXPORT_SYMBOL(ieee80211_sta_recalc_aggregates);
2352 
2353 void ieee80211_sta_update_pending_airtime(struct ieee80211_local *local,
2354 					  struct sta_info *sta, u8 ac,
2355 					  u16 tx_airtime, bool tx_completed)
2356 {
2357 	int tx_pending;
2358 
2359 	if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL))
2360 		return;
2361 
2362 	if (!tx_completed) {
2363 		if (sta)
2364 			atomic_add(tx_airtime,
2365 				   &sta->airtime[ac].aql_tx_pending);
2366 
2367 		atomic_add(tx_airtime, &local->aql_total_pending_airtime);
2368 		atomic_add(tx_airtime, &local->aql_ac_pending_airtime[ac]);
2369 		return;
2370 	}
2371 
2372 	if (sta) {
2373 		tx_pending = atomic_sub_return(tx_airtime,
2374 					       &sta->airtime[ac].aql_tx_pending);
2375 		if (tx_pending < 0)
2376 			atomic_cmpxchg(&sta->airtime[ac].aql_tx_pending,
2377 				       tx_pending, 0);
2378 	}
2379 
2380 	atomic_sub(tx_airtime, &local->aql_total_pending_airtime);
2381 	tx_pending = atomic_sub_return(tx_airtime,
2382 				       &local->aql_ac_pending_airtime[ac]);
2383 	if (WARN_ONCE(tx_pending < 0,
2384 		      "Device %s AC %d pending airtime underflow: %u, %u",
2385 		      wiphy_name(local->hw.wiphy), ac, tx_pending,
2386 		      tx_airtime)) {
2387 		atomic_cmpxchg(&local->aql_ac_pending_airtime[ac],
2388 			       tx_pending, 0);
2389 		atomic_sub(tx_pending, &local->aql_total_pending_airtime);
2390 	}
2391 }
2392 
2393 static struct ieee80211_sta_rx_stats *
2394 sta_get_last_rx_stats(struct sta_info *sta)
2395 {
2396 	struct ieee80211_sta_rx_stats *stats = &sta->deflink.rx_stats;
2397 	int cpu;
2398 
2399 	if (!sta->deflink.pcpu_rx_stats)
2400 		return stats;
2401 
2402 	for_each_possible_cpu(cpu) {
2403 		struct ieee80211_sta_rx_stats *cpustats;
2404 
2405 		cpustats = per_cpu_ptr(sta->deflink.pcpu_rx_stats, cpu);
2406 
2407 		if (time_after(cpustats->last_rx, stats->last_rx))
2408 			stats = cpustats;
2409 	}
2410 
2411 	return stats;
2412 }
2413 
2414 static void sta_stats_decode_rate(struct ieee80211_local *local, u32 rate,
2415 				  struct rate_info *rinfo)
2416 {
2417 	rinfo->bw = STA_STATS_GET(BW, rate);
2418 
2419 	switch (STA_STATS_GET(TYPE, rate)) {
2420 	case STA_STATS_RATE_TYPE_VHT:
2421 		rinfo->flags = RATE_INFO_FLAGS_VHT_MCS;
2422 		rinfo->mcs = STA_STATS_GET(VHT_MCS, rate);
2423 		rinfo->nss = STA_STATS_GET(VHT_NSS, rate);
2424 		if (STA_STATS_GET(SGI, rate))
2425 			rinfo->flags |= RATE_INFO_FLAGS_SHORT_GI;
2426 		break;
2427 	case STA_STATS_RATE_TYPE_HT:
2428 		rinfo->flags = RATE_INFO_FLAGS_MCS;
2429 		rinfo->mcs = STA_STATS_GET(HT_MCS, rate);
2430 		if (STA_STATS_GET(SGI, rate))
2431 			rinfo->flags |= RATE_INFO_FLAGS_SHORT_GI;
2432 		break;
2433 	case STA_STATS_RATE_TYPE_LEGACY: {
2434 		struct ieee80211_supported_band *sband;
2435 		u16 brate;
2436 		unsigned int shift;
2437 		int band = STA_STATS_GET(LEGACY_BAND, rate);
2438 		int rate_idx = STA_STATS_GET(LEGACY_IDX, rate);
2439 
2440 		sband = local->hw.wiphy->bands[band];
2441 
2442 		if (WARN_ON_ONCE(!sband->bitrates))
2443 			break;
2444 
2445 		brate = sband->bitrates[rate_idx].bitrate;
2446 		if (rinfo->bw == RATE_INFO_BW_5)
2447 			shift = 2;
2448 		else if (rinfo->bw == RATE_INFO_BW_10)
2449 			shift = 1;
2450 		else
2451 			shift = 0;
2452 		rinfo->legacy = DIV_ROUND_UP(brate, 1 << shift);
2453 		break;
2454 		}
2455 	case STA_STATS_RATE_TYPE_HE:
2456 		rinfo->flags = RATE_INFO_FLAGS_HE_MCS;
2457 		rinfo->mcs = STA_STATS_GET(HE_MCS, rate);
2458 		rinfo->nss = STA_STATS_GET(HE_NSS, rate);
2459 		rinfo->he_gi = STA_STATS_GET(HE_GI, rate);
2460 		rinfo->he_ru_alloc = STA_STATS_GET(HE_RU, rate);
2461 		rinfo->he_dcm = STA_STATS_GET(HE_DCM, rate);
2462 		break;
2463 	case STA_STATS_RATE_TYPE_EHT:
2464 		rinfo->flags = RATE_INFO_FLAGS_EHT_MCS;
2465 		rinfo->mcs = STA_STATS_GET(EHT_MCS, rate);
2466 		rinfo->nss = STA_STATS_GET(EHT_NSS, rate);
2467 		rinfo->eht_gi = STA_STATS_GET(EHT_GI, rate);
2468 		rinfo->eht_ru_alloc = STA_STATS_GET(EHT_RU, rate);
2469 		break;
2470 	}
2471 }
2472 
2473 static int sta_set_rate_info_rx(struct sta_info *sta, struct rate_info *rinfo)
2474 {
2475 	u32 rate = READ_ONCE(sta_get_last_rx_stats(sta)->last_rate);
2476 
2477 	if (rate == STA_STATS_RATE_INVALID)
2478 		return -EINVAL;
2479 
2480 	sta_stats_decode_rate(sta->local, rate, rinfo);
2481 	return 0;
2482 }
2483 
2484 static inline u64 sta_get_tidstats_msdu(struct ieee80211_sta_rx_stats *rxstats,
2485 					int tid)
2486 {
2487 	unsigned int start;
2488 	u64 value;
2489 
2490 	do {
2491 		start = u64_stats_fetch_begin(&rxstats->syncp);
2492 		value = rxstats->msdu[tid];
2493 	} while (u64_stats_fetch_retry(&rxstats->syncp, start));
2494 
2495 	return value;
2496 }
2497 
2498 static void sta_set_tidstats(struct sta_info *sta,
2499 			     struct cfg80211_tid_stats *tidstats,
2500 			     int tid)
2501 {
2502 	struct ieee80211_local *local = sta->local;
2503 	int cpu;
2504 
2505 	if (!(tidstats->filled & BIT(NL80211_TID_STATS_RX_MSDU))) {
2506 		tidstats->rx_msdu += sta_get_tidstats_msdu(&sta->deflink.rx_stats,
2507 							   tid);
2508 
2509 		if (sta->deflink.pcpu_rx_stats) {
2510 			for_each_possible_cpu(cpu) {
2511 				struct ieee80211_sta_rx_stats *cpurxs;
2512 
2513 				cpurxs = per_cpu_ptr(sta->deflink.pcpu_rx_stats,
2514 						     cpu);
2515 				tidstats->rx_msdu +=
2516 					sta_get_tidstats_msdu(cpurxs, tid);
2517 			}
2518 		}
2519 
2520 		tidstats->filled |= BIT(NL80211_TID_STATS_RX_MSDU);
2521 	}
2522 
2523 	if (!(tidstats->filled & BIT(NL80211_TID_STATS_TX_MSDU))) {
2524 		tidstats->filled |= BIT(NL80211_TID_STATS_TX_MSDU);
2525 		tidstats->tx_msdu = sta->deflink.tx_stats.msdu[tid];
2526 	}
2527 
2528 	if (!(tidstats->filled & BIT(NL80211_TID_STATS_TX_MSDU_RETRIES)) &&
2529 	    ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
2530 		tidstats->filled |= BIT(NL80211_TID_STATS_TX_MSDU_RETRIES);
2531 		tidstats->tx_msdu_retries = sta->deflink.status_stats.msdu_retries[tid];
2532 	}
2533 
2534 	if (!(tidstats->filled & BIT(NL80211_TID_STATS_TX_MSDU_FAILED)) &&
2535 	    ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
2536 		tidstats->filled |= BIT(NL80211_TID_STATS_TX_MSDU_FAILED);
2537 		tidstats->tx_msdu_failed = sta->deflink.status_stats.msdu_failed[tid];
2538 	}
2539 
2540 	if (tid < IEEE80211_NUM_TIDS) {
2541 		spin_lock_bh(&local->fq.lock);
2542 		rcu_read_lock();
2543 
2544 		tidstats->filled |= BIT(NL80211_TID_STATS_TXQ_STATS);
2545 		ieee80211_fill_txq_stats(&tidstats->txq_stats,
2546 					 to_txq_info(sta->sta.txq[tid]));
2547 
2548 		rcu_read_unlock();
2549 		spin_unlock_bh(&local->fq.lock);
2550 	}
2551 }
2552 
2553 static inline u64 sta_get_stats_bytes(struct ieee80211_sta_rx_stats *rxstats)
2554 {
2555 	unsigned int start;
2556 	u64 value;
2557 
2558 	do {
2559 		start = u64_stats_fetch_begin(&rxstats->syncp);
2560 		value = rxstats->bytes;
2561 	} while (u64_stats_fetch_retry(&rxstats->syncp, start));
2562 
2563 	return value;
2564 }
2565 
2566 void sta_set_sinfo(struct sta_info *sta, struct station_info *sinfo,
2567 		   bool tidstats)
2568 {
2569 	struct ieee80211_sub_if_data *sdata = sta->sdata;
2570 	struct ieee80211_local *local = sdata->local;
2571 	u32 thr = 0;
2572 	int i, ac, cpu;
2573 	struct ieee80211_sta_rx_stats *last_rxstats;
2574 
2575 	last_rxstats = sta_get_last_rx_stats(sta);
2576 
2577 	sinfo->generation = sdata->local->sta_generation;
2578 
2579 	/* do before driver, so beacon filtering drivers have a
2580 	 * chance to e.g. just add the number of filtered beacons
2581 	 * (or just modify the value entirely, of course)
2582 	 */
2583 	if (sdata->vif.type == NL80211_IFTYPE_STATION)
2584 		sinfo->rx_beacon = sdata->deflink.u.mgd.count_beacon_signal;
2585 
2586 	drv_sta_statistics(local, sdata, &sta->sta, sinfo);
2587 	sinfo->filled |= BIT_ULL(NL80211_STA_INFO_INACTIVE_TIME) |
2588 			 BIT_ULL(NL80211_STA_INFO_STA_FLAGS) |
2589 			 BIT_ULL(NL80211_STA_INFO_BSS_PARAM) |
2590 			 BIT_ULL(NL80211_STA_INFO_CONNECTED_TIME) |
2591 			 BIT_ULL(NL80211_STA_INFO_ASSOC_AT_BOOTTIME) |
2592 			 BIT_ULL(NL80211_STA_INFO_RX_DROP_MISC);
2593 
2594 	if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2595 		sinfo->beacon_loss_count =
2596 			sdata->deflink.u.mgd.beacon_loss_count;
2597 		sinfo->filled |= BIT_ULL(NL80211_STA_INFO_BEACON_LOSS);
2598 	}
2599 
2600 	sinfo->connected_time = ktime_get_seconds() - sta->last_connected;
2601 	sinfo->assoc_at = sta->assoc_at;
2602 	sinfo->inactive_time =
2603 		jiffies_to_msecs(jiffies - ieee80211_sta_last_active(sta));
2604 
2605 	if (!(sinfo->filled & (BIT_ULL(NL80211_STA_INFO_TX_BYTES64) |
2606 			       BIT_ULL(NL80211_STA_INFO_TX_BYTES)))) {
2607 		sinfo->tx_bytes = 0;
2608 		for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
2609 			sinfo->tx_bytes += sta->deflink.tx_stats.bytes[ac];
2610 		sinfo->filled |= BIT_ULL(NL80211_STA_INFO_TX_BYTES64);
2611 	}
2612 
2613 	if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_TX_PACKETS))) {
2614 		sinfo->tx_packets = 0;
2615 		for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
2616 			sinfo->tx_packets += sta->deflink.tx_stats.packets[ac];
2617 		sinfo->filled |= BIT_ULL(NL80211_STA_INFO_TX_PACKETS);
2618 	}
2619 
2620 	if (!(sinfo->filled & (BIT_ULL(NL80211_STA_INFO_RX_BYTES64) |
2621 			       BIT_ULL(NL80211_STA_INFO_RX_BYTES)))) {
2622 		sinfo->rx_bytes += sta_get_stats_bytes(&sta->deflink.rx_stats);
2623 
2624 		if (sta->deflink.pcpu_rx_stats) {
2625 			for_each_possible_cpu(cpu) {
2626 				struct ieee80211_sta_rx_stats *cpurxs;
2627 
2628 				cpurxs = per_cpu_ptr(sta->deflink.pcpu_rx_stats,
2629 						     cpu);
2630 				sinfo->rx_bytes += sta_get_stats_bytes(cpurxs);
2631 			}
2632 		}
2633 
2634 		sinfo->filled |= BIT_ULL(NL80211_STA_INFO_RX_BYTES64);
2635 	}
2636 
2637 	if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_RX_PACKETS))) {
2638 		sinfo->rx_packets = sta->deflink.rx_stats.packets;
2639 		if (sta->deflink.pcpu_rx_stats) {
2640 			for_each_possible_cpu(cpu) {
2641 				struct ieee80211_sta_rx_stats *cpurxs;
2642 
2643 				cpurxs = per_cpu_ptr(sta->deflink.pcpu_rx_stats,
2644 						     cpu);
2645 				sinfo->rx_packets += cpurxs->packets;
2646 			}
2647 		}
2648 		sinfo->filled |= BIT_ULL(NL80211_STA_INFO_RX_PACKETS);
2649 	}
2650 
2651 	if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_TX_RETRIES))) {
2652 		sinfo->tx_retries = sta->deflink.status_stats.retry_count;
2653 		sinfo->filled |= BIT_ULL(NL80211_STA_INFO_TX_RETRIES);
2654 	}
2655 
2656 	if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_TX_FAILED))) {
2657 		sinfo->tx_failed = sta->deflink.status_stats.retry_failed;
2658 		sinfo->filled |= BIT_ULL(NL80211_STA_INFO_TX_FAILED);
2659 	}
2660 
2661 	if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_RX_DURATION))) {
2662 		for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
2663 			sinfo->rx_duration += sta->airtime[ac].rx_airtime;
2664 		sinfo->filled |= BIT_ULL(NL80211_STA_INFO_RX_DURATION);
2665 	}
2666 
2667 	if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_TX_DURATION))) {
2668 		for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
2669 			sinfo->tx_duration += sta->airtime[ac].tx_airtime;
2670 		sinfo->filled |= BIT_ULL(NL80211_STA_INFO_TX_DURATION);
2671 	}
2672 
2673 	if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_AIRTIME_WEIGHT))) {
2674 		sinfo->airtime_weight = sta->airtime_weight;
2675 		sinfo->filled |= BIT_ULL(NL80211_STA_INFO_AIRTIME_WEIGHT);
2676 	}
2677 
2678 	sinfo->rx_dropped_misc = sta->deflink.rx_stats.dropped;
2679 	if (sta->deflink.pcpu_rx_stats) {
2680 		for_each_possible_cpu(cpu) {
2681 			struct ieee80211_sta_rx_stats *cpurxs;
2682 
2683 			cpurxs = per_cpu_ptr(sta->deflink.pcpu_rx_stats, cpu);
2684 			sinfo->rx_dropped_misc += cpurxs->dropped;
2685 		}
2686 	}
2687 
2688 	if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2689 	    !(sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)) {
2690 		sinfo->filled |= BIT_ULL(NL80211_STA_INFO_BEACON_RX) |
2691 				 BIT_ULL(NL80211_STA_INFO_BEACON_SIGNAL_AVG);
2692 		sinfo->rx_beacon_signal_avg = ieee80211_ave_rssi(&sdata->vif);
2693 	}
2694 
2695 	if (ieee80211_hw_check(&sta->local->hw, SIGNAL_DBM) ||
2696 	    ieee80211_hw_check(&sta->local->hw, SIGNAL_UNSPEC)) {
2697 		if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_SIGNAL))) {
2698 			sinfo->signal = (s8)last_rxstats->last_signal;
2699 			sinfo->filled |= BIT_ULL(NL80211_STA_INFO_SIGNAL);
2700 		}
2701 
2702 		if (!sta->deflink.pcpu_rx_stats &&
2703 		    !(sinfo->filled & BIT_ULL(NL80211_STA_INFO_SIGNAL_AVG))) {
2704 			sinfo->signal_avg =
2705 				-ewma_signal_read(&sta->deflink.rx_stats_avg.signal);
2706 			sinfo->filled |= BIT_ULL(NL80211_STA_INFO_SIGNAL_AVG);
2707 		}
2708 	}
2709 
2710 	/* for the average - if pcpu_rx_stats isn't set - rxstats must point to
2711 	 * the sta->rx_stats struct, so the check here is fine with and without
2712 	 * pcpu statistics
2713 	 */
2714 	if (last_rxstats->chains &&
2715 	    !(sinfo->filled & (BIT_ULL(NL80211_STA_INFO_CHAIN_SIGNAL) |
2716 			       BIT_ULL(NL80211_STA_INFO_CHAIN_SIGNAL_AVG)))) {
2717 		sinfo->filled |= BIT_ULL(NL80211_STA_INFO_CHAIN_SIGNAL);
2718 		if (!sta->deflink.pcpu_rx_stats)
2719 			sinfo->filled |= BIT_ULL(NL80211_STA_INFO_CHAIN_SIGNAL_AVG);
2720 
2721 		sinfo->chains = last_rxstats->chains;
2722 
2723 		for (i = 0; i < ARRAY_SIZE(sinfo->chain_signal); i++) {
2724 			sinfo->chain_signal[i] =
2725 				last_rxstats->chain_signal_last[i];
2726 			sinfo->chain_signal_avg[i] =
2727 				-ewma_signal_read(&sta->deflink.rx_stats_avg.chain_signal[i]);
2728 		}
2729 	}
2730 
2731 	if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_TX_BITRATE)) &&
2732 	    !sta->sta.valid_links &&
2733 	    ieee80211_rate_valid(&sta->deflink.tx_stats.last_rate)) {
2734 		sta_set_rate_info_tx(sta, &sta->deflink.tx_stats.last_rate,
2735 				     &sinfo->txrate);
2736 		sinfo->filled |= BIT_ULL(NL80211_STA_INFO_TX_BITRATE);
2737 	}
2738 
2739 	if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_RX_BITRATE)) &&
2740 	    !sta->sta.valid_links) {
2741 		if (sta_set_rate_info_rx(sta, &sinfo->rxrate) == 0)
2742 			sinfo->filled |= BIT_ULL(NL80211_STA_INFO_RX_BITRATE);
2743 	}
2744 
2745 	if (tidstats && !cfg80211_sinfo_alloc_tid_stats(sinfo, GFP_KERNEL)) {
2746 		for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++)
2747 			sta_set_tidstats(sta, &sinfo->pertid[i], i);
2748 	}
2749 
2750 	if (ieee80211_vif_is_mesh(&sdata->vif)) {
2751 #ifdef CONFIG_MAC80211_MESH
2752 		sinfo->filled |= BIT_ULL(NL80211_STA_INFO_LLID) |
2753 				 BIT_ULL(NL80211_STA_INFO_PLID) |
2754 				 BIT_ULL(NL80211_STA_INFO_PLINK_STATE) |
2755 				 BIT_ULL(NL80211_STA_INFO_LOCAL_PM) |
2756 				 BIT_ULL(NL80211_STA_INFO_PEER_PM) |
2757 				 BIT_ULL(NL80211_STA_INFO_NONPEER_PM) |
2758 				 BIT_ULL(NL80211_STA_INFO_CONNECTED_TO_GATE) |
2759 				 BIT_ULL(NL80211_STA_INFO_CONNECTED_TO_AS);
2760 
2761 		sinfo->llid = sta->mesh->llid;
2762 		sinfo->plid = sta->mesh->plid;
2763 		sinfo->plink_state = sta->mesh->plink_state;
2764 		if (test_sta_flag(sta, WLAN_STA_TOFFSET_KNOWN)) {
2765 			sinfo->filled |= BIT_ULL(NL80211_STA_INFO_T_OFFSET);
2766 			sinfo->t_offset = sta->mesh->t_offset;
2767 		}
2768 		sinfo->local_pm = sta->mesh->local_pm;
2769 		sinfo->peer_pm = sta->mesh->peer_pm;
2770 		sinfo->nonpeer_pm = sta->mesh->nonpeer_pm;
2771 		sinfo->connected_to_gate = sta->mesh->connected_to_gate;
2772 		sinfo->connected_to_as = sta->mesh->connected_to_as;
2773 #endif
2774 	}
2775 
2776 	sinfo->bss_param.flags = 0;
2777 	if (sdata->vif.bss_conf.use_cts_prot)
2778 		sinfo->bss_param.flags |= BSS_PARAM_FLAGS_CTS_PROT;
2779 	if (sdata->vif.bss_conf.use_short_preamble)
2780 		sinfo->bss_param.flags |= BSS_PARAM_FLAGS_SHORT_PREAMBLE;
2781 	if (sdata->vif.bss_conf.use_short_slot)
2782 		sinfo->bss_param.flags |= BSS_PARAM_FLAGS_SHORT_SLOT_TIME;
2783 	sinfo->bss_param.dtim_period = sdata->vif.bss_conf.dtim_period;
2784 	sinfo->bss_param.beacon_interval = sdata->vif.bss_conf.beacon_int;
2785 
2786 	sinfo->sta_flags.set = 0;
2787 	sinfo->sta_flags.mask = BIT(NL80211_STA_FLAG_AUTHORIZED) |
2788 				BIT(NL80211_STA_FLAG_SHORT_PREAMBLE) |
2789 				BIT(NL80211_STA_FLAG_WME) |
2790 				BIT(NL80211_STA_FLAG_MFP) |
2791 				BIT(NL80211_STA_FLAG_AUTHENTICATED) |
2792 				BIT(NL80211_STA_FLAG_ASSOCIATED) |
2793 				BIT(NL80211_STA_FLAG_TDLS_PEER);
2794 	if (test_sta_flag(sta, WLAN_STA_AUTHORIZED))
2795 		sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_AUTHORIZED);
2796 	if (test_sta_flag(sta, WLAN_STA_SHORT_PREAMBLE))
2797 		sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_SHORT_PREAMBLE);
2798 	if (sta->sta.wme)
2799 		sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_WME);
2800 	if (test_sta_flag(sta, WLAN_STA_MFP))
2801 		sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_MFP);
2802 	if (test_sta_flag(sta, WLAN_STA_AUTH))
2803 		sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_AUTHENTICATED);
2804 	if (test_sta_flag(sta, WLAN_STA_ASSOC))
2805 		sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_ASSOCIATED);
2806 	if (test_sta_flag(sta, WLAN_STA_TDLS_PEER))
2807 		sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_TDLS_PEER);
2808 
2809 	thr = sta_get_expected_throughput(sta);
2810 
2811 	if (thr != 0) {
2812 		sinfo->filled |= BIT_ULL(NL80211_STA_INFO_EXPECTED_THROUGHPUT);
2813 		sinfo->expected_throughput = thr;
2814 	}
2815 
2816 	if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_ACK_SIGNAL)) &&
2817 	    sta->deflink.status_stats.ack_signal_filled) {
2818 		sinfo->ack_signal = sta->deflink.status_stats.last_ack_signal;
2819 		sinfo->filled |= BIT_ULL(NL80211_STA_INFO_ACK_SIGNAL);
2820 	}
2821 
2822 	if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_ACK_SIGNAL_AVG)) &&
2823 	    sta->deflink.status_stats.ack_signal_filled) {
2824 		sinfo->avg_ack_signal =
2825 			-(s8)ewma_avg_signal_read(
2826 				&sta->deflink.status_stats.avg_ack_signal);
2827 		sinfo->filled |=
2828 			BIT_ULL(NL80211_STA_INFO_ACK_SIGNAL_AVG);
2829 	}
2830 
2831 	if (ieee80211_vif_is_mesh(&sdata->vif)) {
2832 		sinfo->filled |= BIT_ULL(NL80211_STA_INFO_AIRTIME_LINK_METRIC);
2833 		sinfo->airtime_link_metric =
2834 			airtime_link_metric_get(local, sta);
2835 	}
2836 }
2837 
2838 u32 sta_get_expected_throughput(struct sta_info *sta)
2839 {
2840 	struct ieee80211_sub_if_data *sdata = sta->sdata;
2841 	struct ieee80211_local *local = sdata->local;
2842 	struct rate_control_ref *ref = NULL;
2843 	u32 thr = 0;
2844 
2845 	if (test_sta_flag(sta, WLAN_STA_RATE_CONTROL))
2846 		ref = local->rate_ctrl;
2847 
2848 	/* check if the driver has a SW RC implementation */
2849 	if (ref && ref->ops->get_expected_throughput)
2850 		thr = ref->ops->get_expected_throughput(sta->rate_ctrl_priv);
2851 	else
2852 		thr = drv_get_expected_throughput(local, sta);
2853 
2854 	return thr;
2855 }
2856 
2857 unsigned long ieee80211_sta_last_active(struct sta_info *sta)
2858 {
2859 	struct ieee80211_sta_rx_stats *stats = sta_get_last_rx_stats(sta);
2860 
2861 	if (!sta->deflink.status_stats.last_ack ||
2862 	    time_after(stats->last_rx, sta->deflink.status_stats.last_ack))
2863 		return stats->last_rx;
2864 	return sta->deflink.status_stats.last_ack;
2865 }
2866 
2867 static void sta_update_codel_params(struct sta_info *sta, u32 thr)
2868 {
2869 	if (thr && thr < STA_SLOW_THRESHOLD * sta->local->num_sta) {
2870 		sta->cparams.target = MS2TIME(50);
2871 		sta->cparams.interval = MS2TIME(300);
2872 		sta->cparams.ecn = false;
2873 	} else {
2874 		sta->cparams.target = MS2TIME(20);
2875 		sta->cparams.interval = MS2TIME(100);
2876 		sta->cparams.ecn = true;
2877 	}
2878 }
2879 
2880 void ieee80211_sta_set_expected_throughput(struct ieee80211_sta *pubsta,
2881 					   u32 thr)
2882 {
2883 	struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
2884 
2885 	sta_update_codel_params(sta, thr);
2886 }
2887 
2888 int ieee80211_sta_allocate_link(struct sta_info *sta, unsigned int link_id)
2889 {
2890 	struct ieee80211_sub_if_data *sdata = sta->sdata;
2891 	struct sta_link_alloc *alloc;
2892 	int ret;
2893 
2894 	lockdep_assert_wiphy(sdata->local->hw.wiphy);
2895 
2896 	WARN_ON(!test_sta_flag(sta, WLAN_STA_INSERTED));
2897 
2898 	/* must represent an MLD from the start */
2899 	if (WARN_ON(!sta->sta.valid_links))
2900 		return -EINVAL;
2901 
2902 	if (WARN_ON(sta->sta.valid_links & BIT(link_id) ||
2903 		    sta->link[link_id]))
2904 		return -EBUSY;
2905 
2906 	alloc = kzalloc(sizeof(*alloc), GFP_KERNEL);
2907 	if (!alloc)
2908 		return -ENOMEM;
2909 
2910 	ret = sta_info_alloc_link(sdata->local, &alloc->info, GFP_KERNEL);
2911 	if (ret) {
2912 		kfree(alloc);
2913 		return ret;
2914 	}
2915 
2916 	sta_info_add_link(sta, link_id, &alloc->info, &alloc->sta);
2917 
2918 	ieee80211_link_sta_debugfs_add(&alloc->info);
2919 
2920 	return 0;
2921 }
2922 
2923 void ieee80211_sta_free_link(struct sta_info *sta, unsigned int link_id)
2924 {
2925 	lockdep_assert_wiphy(sta->sdata->local->hw.wiphy);
2926 
2927 	WARN_ON(!test_sta_flag(sta, WLAN_STA_INSERTED));
2928 
2929 	sta_remove_link(sta, link_id, false);
2930 }
2931 
2932 int ieee80211_sta_activate_link(struct sta_info *sta, unsigned int link_id)
2933 {
2934 	struct ieee80211_sub_if_data *sdata = sta->sdata;
2935 	struct link_sta_info *link_sta;
2936 	u16 old_links = sta->sta.valid_links;
2937 	u16 new_links = old_links | BIT(link_id);
2938 	int ret;
2939 
2940 	link_sta = rcu_dereference_protected(sta->link[link_id],
2941 					     lockdep_is_held(&sdata->local->hw.wiphy->mtx));
2942 
2943 	if (WARN_ON(old_links == new_links || !link_sta))
2944 		return -EINVAL;
2945 
2946 	rcu_read_lock();
2947 	if (link_sta_info_hash_lookup(sdata->local, link_sta->addr)) {
2948 		rcu_read_unlock();
2949 		return -EALREADY;
2950 	}
2951 	/* we only modify under the mutex so this is fine */
2952 	rcu_read_unlock();
2953 
2954 	sta->sta.valid_links = new_links;
2955 
2956 	if (WARN_ON(!test_sta_flag(sta, WLAN_STA_INSERTED)))
2957 		goto hash;
2958 
2959 	ieee80211_recalc_min_chandef(sdata, link_id);
2960 
2961 	/* Ensure the values are updated for the driver,
2962 	 * redone by sta_remove_link on failure.
2963 	 */
2964 	ieee80211_sta_recalc_aggregates(&sta->sta);
2965 
2966 	ret = drv_change_sta_links(sdata->local, sdata, &sta->sta,
2967 				   old_links, new_links);
2968 	if (ret) {
2969 		sta->sta.valid_links = old_links;
2970 		sta_remove_link(sta, link_id, false);
2971 		return ret;
2972 	}
2973 
2974 hash:
2975 	ret = link_sta_info_hash_add(sdata->local, link_sta);
2976 	WARN_ON(ret);
2977 	return 0;
2978 }
2979 
2980 void ieee80211_sta_remove_link(struct sta_info *sta, unsigned int link_id)
2981 {
2982 	struct ieee80211_sub_if_data *sdata = sta->sdata;
2983 	u16 old_links = sta->sta.valid_links;
2984 
2985 	lockdep_assert_wiphy(sdata->local->hw.wiphy);
2986 
2987 	sta->sta.valid_links &= ~BIT(link_id);
2988 
2989 	if (!WARN_ON(!test_sta_flag(sta, WLAN_STA_INSERTED)))
2990 		drv_change_sta_links(sdata->local, sdata, &sta->sta,
2991 				     old_links, sta->sta.valid_links);
2992 
2993 	sta_remove_link(sta, link_id, true);
2994 }
2995 
2996 void ieee80211_sta_set_max_amsdu_subframes(struct sta_info *sta,
2997 					   const u8 *ext_capab,
2998 					   unsigned int ext_capab_len)
2999 {
3000 	u8 val;
3001 
3002 	sta->sta.max_amsdu_subframes = 0;
3003 
3004 	if (ext_capab_len < 8)
3005 		return;
3006 
3007 	/* The sender might not have sent the last bit, consider it to be 0 */
3008 	val = u8_get_bits(ext_capab[7], WLAN_EXT_CAPA8_MAX_MSDU_IN_AMSDU_LSB);
3009 
3010 	/* we did get all the bits, take the MSB as well */
3011 	if (ext_capab_len >= 9)
3012 		val |= u8_get_bits(ext_capab[8],
3013 				   WLAN_EXT_CAPA9_MAX_MSDU_IN_AMSDU_MSB) << 1;
3014 
3015 	if (val)
3016 		sta->sta.max_amsdu_subframes = 4 << (4 - val);
3017 }
3018 
3019 #ifdef CONFIG_LOCKDEP
3020 bool lockdep_sta_mutex_held(struct ieee80211_sta *pubsta)
3021 {
3022 	struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
3023 
3024 	return lockdep_is_held(&sta->local->hw.wiphy->mtx);
3025 }
3026 EXPORT_SYMBOL(lockdep_sta_mutex_held);
3027 #endif
3028