1 /******************************************************************************
2  *
3  * This file is provided under a dual BSD/GPLv2 license.  When using or
4  * redistributing this file, you may do so under either license.
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6  * GPL LICENSE SUMMARY
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8  * Copyright(c) 2012 - 2015 Intel Corporation. All rights reserved.
9  * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
10  * Copyright(c) 2016 Intel Deutschland GmbH
11  *
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35  * Copyright(c) 2012 - 2015 Intel Corporation. All rights reserved.
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67 #include <net/mac80211.h>
68 
69 #include "mvm.h"
70 #include "sta.h"
71 #include "rs.h"
72 
73 /*
74  * New version of ADD_STA_sta command added new fields at the end of the
75  * structure, so sending the size of the relevant API's structure is enough to
76  * support both API versions.
77  */
78 static inline int iwl_mvm_add_sta_cmd_size(struct iwl_mvm *mvm)
79 {
80 	return iwl_mvm_has_new_rx_api(mvm) ?
81 		sizeof(struct iwl_mvm_add_sta_cmd) :
82 		sizeof(struct iwl_mvm_add_sta_cmd_v7);
83 }
84 
85 static int iwl_mvm_find_free_sta_id(struct iwl_mvm *mvm,
86 				    enum nl80211_iftype iftype)
87 {
88 	int sta_id;
89 	u32 reserved_ids = 0;
90 
91 	BUILD_BUG_ON(IWL_MVM_STATION_COUNT > 32);
92 	WARN_ON_ONCE(test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status));
93 
94 	lockdep_assert_held(&mvm->mutex);
95 
96 	/* d0i3/d3 assumes the AP's sta_id (of sta vif) is 0. reserve it. */
97 	if (iftype != NL80211_IFTYPE_STATION)
98 		reserved_ids = BIT(0);
99 
100 	/* Don't take rcu_read_lock() since we are protected by mvm->mutex */
101 	for (sta_id = 0; sta_id < IWL_MVM_STATION_COUNT; sta_id++) {
102 		if (BIT(sta_id) & reserved_ids)
103 			continue;
104 
105 		if (!rcu_dereference_protected(mvm->fw_id_to_mac_id[sta_id],
106 					       lockdep_is_held(&mvm->mutex)))
107 			return sta_id;
108 	}
109 	return IWL_MVM_STATION_COUNT;
110 }
111 
112 /* send station add/update command to firmware */
113 int iwl_mvm_sta_send_to_fw(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
114 			   bool update, unsigned int flags)
115 {
116 	struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
117 	struct iwl_mvm_add_sta_cmd add_sta_cmd = {
118 		.sta_id = mvm_sta->sta_id,
119 		.mac_id_n_color = cpu_to_le32(mvm_sta->mac_id_n_color),
120 		.add_modify = update ? 1 : 0,
121 		.station_flags_msk = cpu_to_le32(STA_FLG_FAT_EN_MSK |
122 						 STA_FLG_MIMO_EN_MSK),
123 		.tid_disable_tx = cpu_to_le16(mvm_sta->tid_disable_agg),
124 	};
125 	int ret;
126 	u32 status;
127 	u32 agg_size = 0, mpdu_dens = 0;
128 
129 	if (!update || (flags & STA_MODIFY_QUEUES)) {
130 		add_sta_cmd.tfd_queue_msk = cpu_to_le32(mvm_sta->tfd_queue_msk);
131 		memcpy(&add_sta_cmd.addr, sta->addr, ETH_ALEN);
132 
133 		if (flags & STA_MODIFY_QUEUES)
134 			add_sta_cmd.modify_mask |= STA_MODIFY_QUEUES;
135 	}
136 
137 	switch (sta->bandwidth) {
138 	case IEEE80211_STA_RX_BW_160:
139 		add_sta_cmd.station_flags |= cpu_to_le32(STA_FLG_FAT_EN_160MHZ);
140 		/* fall through */
141 	case IEEE80211_STA_RX_BW_80:
142 		add_sta_cmd.station_flags |= cpu_to_le32(STA_FLG_FAT_EN_80MHZ);
143 		/* fall through */
144 	case IEEE80211_STA_RX_BW_40:
145 		add_sta_cmd.station_flags |= cpu_to_le32(STA_FLG_FAT_EN_40MHZ);
146 		/* fall through */
147 	case IEEE80211_STA_RX_BW_20:
148 		if (sta->ht_cap.ht_supported)
149 			add_sta_cmd.station_flags |=
150 				cpu_to_le32(STA_FLG_FAT_EN_20MHZ);
151 		break;
152 	}
153 
154 	switch (sta->rx_nss) {
155 	case 1:
156 		add_sta_cmd.station_flags |= cpu_to_le32(STA_FLG_MIMO_EN_SISO);
157 		break;
158 	case 2:
159 		add_sta_cmd.station_flags |= cpu_to_le32(STA_FLG_MIMO_EN_MIMO2);
160 		break;
161 	case 3 ... 8:
162 		add_sta_cmd.station_flags |= cpu_to_le32(STA_FLG_MIMO_EN_MIMO3);
163 		break;
164 	}
165 
166 	switch (sta->smps_mode) {
167 	case IEEE80211_SMPS_AUTOMATIC:
168 	case IEEE80211_SMPS_NUM_MODES:
169 		WARN_ON(1);
170 		break;
171 	case IEEE80211_SMPS_STATIC:
172 		/* override NSS */
173 		add_sta_cmd.station_flags &= ~cpu_to_le32(STA_FLG_MIMO_EN_MSK);
174 		add_sta_cmd.station_flags |= cpu_to_le32(STA_FLG_MIMO_EN_SISO);
175 		break;
176 	case IEEE80211_SMPS_DYNAMIC:
177 		add_sta_cmd.station_flags |= cpu_to_le32(STA_FLG_RTS_MIMO_PROT);
178 		break;
179 	case IEEE80211_SMPS_OFF:
180 		/* nothing */
181 		break;
182 	}
183 
184 	if (sta->ht_cap.ht_supported) {
185 		add_sta_cmd.station_flags_msk |=
186 			cpu_to_le32(STA_FLG_MAX_AGG_SIZE_MSK |
187 				    STA_FLG_AGG_MPDU_DENS_MSK);
188 
189 		mpdu_dens = sta->ht_cap.ampdu_density;
190 	}
191 
192 	if (sta->vht_cap.vht_supported) {
193 		agg_size = sta->vht_cap.cap &
194 			IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK;
195 		agg_size >>=
196 			IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_SHIFT;
197 	} else if (sta->ht_cap.ht_supported) {
198 		agg_size = sta->ht_cap.ampdu_factor;
199 	}
200 
201 	add_sta_cmd.station_flags |=
202 		cpu_to_le32(agg_size << STA_FLG_MAX_AGG_SIZE_SHIFT);
203 	add_sta_cmd.station_flags |=
204 		cpu_to_le32(mpdu_dens << STA_FLG_AGG_MPDU_DENS_SHIFT);
205 
206 	status = ADD_STA_SUCCESS;
207 	ret = iwl_mvm_send_cmd_pdu_status(mvm, ADD_STA,
208 					  iwl_mvm_add_sta_cmd_size(mvm),
209 					  &add_sta_cmd, &status);
210 	if (ret)
211 		return ret;
212 
213 	switch (status & IWL_ADD_STA_STATUS_MASK) {
214 	case ADD_STA_SUCCESS:
215 		IWL_DEBUG_ASSOC(mvm, "ADD_STA PASSED\n");
216 		break;
217 	default:
218 		ret = -EIO;
219 		IWL_ERR(mvm, "ADD_STA failed\n");
220 		break;
221 	}
222 
223 	return ret;
224 }
225 
226 static void iwl_mvm_rx_agg_session_expired(unsigned long data)
227 {
228 	struct iwl_mvm_baid_data __rcu **rcu_ptr = (void *)data;
229 	struct iwl_mvm_baid_data *ba_data;
230 	struct ieee80211_sta *sta;
231 	struct iwl_mvm_sta *mvm_sta;
232 	unsigned long timeout;
233 
234 	rcu_read_lock();
235 
236 	ba_data = rcu_dereference(*rcu_ptr);
237 
238 	if (WARN_ON(!ba_data))
239 		goto unlock;
240 
241 	if (!ba_data->timeout)
242 		goto unlock;
243 
244 	timeout = ba_data->last_rx + TU_TO_JIFFIES(ba_data->timeout * 2);
245 	if (time_is_after_jiffies(timeout)) {
246 		mod_timer(&ba_data->session_timer, timeout);
247 		goto unlock;
248 	}
249 
250 	/* Timer expired */
251 	sta = rcu_dereference(ba_data->mvm->fw_id_to_mac_id[ba_data->sta_id]);
252 	mvm_sta = iwl_mvm_sta_from_mac80211(sta);
253 	ieee80211_stop_rx_ba_session_offl(mvm_sta->vif,
254 					  sta->addr, ba_data->tid);
255 unlock:
256 	rcu_read_unlock();
257 }
258 
259 static int iwl_mvm_tdls_sta_init(struct iwl_mvm *mvm,
260 				 struct ieee80211_sta *sta)
261 {
262 	unsigned long used_hw_queues;
263 	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
264 	unsigned int wdg_timeout =
265 		iwl_mvm_get_wd_timeout(mvm, NULL, true, false);
266 	u32 ac;
267 
268 	lockdep_assert_held(&mvm->mutex);
269 
270 	used_hw_queues = iwl_mvm_get_used_hw_queues(mvm, NULL);
271 
272 	/* Find available queues, and allocate them to the ACs */
273 	for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
274 		u8 queue = find_first_zero_bit(&used_hw_queues,
275 					       mvm->first_agg_queue);
276 
277 		if (queue >= mvm->first_agg_queue) {
278 			IWL_ERR(mvm, "Failed to allocate STA queue\n");
279 			return -EBUSY;
280 		}
281 
282 		__set_bit(queue, &used_hw_queues);
283 		mvmsta->hw_queue[ac] = queue;
284 	}
285 
286 	/* Found a place for all queues - enable them */
287 	for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
288 		iwl_mvm_enable_ac_txq(mvm, mvmsta->hw_queue[ac],
289 				      mvmsta->hw_queue[ac],
290 				      iwl_mvm_ac_to_tx_fifo[ac], 0,
291 				      wdg_timeout);
292 		mvmsta->tfd_queue_msk |= BIT(mvmsta->hw_queue[ac]);
293 	}
294 
295 	return 0;
296 }
297 
298 static void iwl_mvm_tdls_sta_deinit(struct iwl_mvm *mvm,
299 				    struct ieee80211_sta *sta)
300 {
301 	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
302 	unsigned long sta_msk;
303 	int i;
304 
305 	lockdep_assert_held(&mvm->mutex);
306 
307 	/* disable the TDLS STA-specific queues */
308 	sta_msk = mvmsta->tfd_queue_msk;
309 	for_each_set_bit(i, &sta_msk, sizeof(sta_msk) * BITS_PER_BYTE)
310 		iwl_mvm_disable_txq(mvm, i, i, IWL_MAX_TID_COUNT, 0);
311 }
312 
313 static int iwl_mvm_sta_alloc_queue(struct iwl_mvm *mvm,
314 				   struct ieee80211_sta *sta, u8 ac, int tid,
315 				   struct ieee80211_hdr *hdr)
316 {
317 	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
318 	struct iwl_trans_txq_scd_cfg cfg = {
319 		.fifo = iwl_mvm_ac_to_tx_fifo[ac],
320 		.sta_id = mvmsta->sta_id,
321 		.tid = tid,
322 		.frame_limit = IWL_FRAME_LIMIT,
323 	};
324 	unsigned int wdg_timeout =
325 		iwl_mvm_get_wd_timeout(mvm, mvmsta->vif, false, false);
326 	u8 mac_queue = mvmsta->vif->hw_queue[ac];
327 	int queue = -1;
328 	int ssn;
329 	int ret;
330 
331 	lockdep_assert_held(&mvm->mutex);
332 
333 	spin_lock_bh(&mvm->queue_info_lock);
334 
335 	/*
336 	 * Non-QoS, QoS NDP and MGMT frames should go to a MGMT queue, if one
337 	 * exists
338 	 */
339 	if (!ieee80211_is_data_qos(hdr->frame_control) ||
340 	    ieee80211_is_qos_nullfunc(hdr->frame_control)) {
341 		queue = iwl_mvm_find_free_queue(mvm, IWL_MVM_DQA_MIN_MGMT_QUEUE,
342 						IWL_MVM_DQA_MAX_MGMT_QUEUE);
343 		if (queue >= IWL_MVM_DQA_MIN_MGMT_QUEUE)
344 			IWL_DEBUG_TX_QUEUES(mvm, "Found free MGMT queue #%d\n",
345 					    queue);
346 
347 		/* If no such queue is found, we'll use a DATA queue instead */
348 	}
349 
350 	if (queue < 0 && mvmsta->reserved_queue != IEEE80211_INVAL_HW_QUEUE) {
351 		queue = mvmsta->reserved_queue;
352 		IWL_DEBUG_TX_QUEUES(mvm, "Using reserved queue #%d\n", queue);
353 	}
354 
355 	if (queue < 0)
356 		queue = iwl_mvm_find_free_queue(mvm, IWL_MVM_DQA_MIN_DATA_QUEUE,
357 						IWL_MVM_DQA_MAX_DATA_QUEUE);
358 
359 	/*
360 	 * Mark TXQ as ready, even though it hasn't been fully configured yet,
361 	 * to make sure no one else takes it.
362 	 * This will allow avoiding re-acquiring the lock at the end of the
363 	 * configuration. On error we'll mark it back as free.
364 	 */
365 	if (queue >= 0)
366 		mvm->queue_info[queue].status = IWL_MVM_QUEUE_READY;
367 
368 	spin_unlock_bh(&mvm->queue_info_lock);
369 
370 	/* TODO: support shared queues for same RA */
371 	if (queue < 0)
372 		return -ENOSPC;
373 
374 	/*
375 	 * Actual en/disablement of aggregations is through the ADD_STA HCMD,
376 	 * but for configuring the SCD to send A-MPDUs we need to mark the queue
377 	 * as aggregatable.
378 	 * Mark all DATA queues as allowing to be aggregated at some point
379 	 */
380 	cfg.aggregate = (queue >= IWL_MVM_DQA_MIN_DATA_QUEUE ||
381 			 queue == IWL_MVM_DQA_BSS_CLIENT_QUEUE);
382 
383 	IWL_DEBUG_TX_QUEUES(mvm, "Allocating queue #%d to sta %d on tid %d\n",
384 			    queue, mvmsta->sta_id, tid);
385 
386 	ssn = IEEE80211_SEQ_TO_SN(le16_to_cpu(hdr->seq_ctrl));
387 	iwl_mvm_enable_txq(mvm, queue, mac_queue, ssn, &cfg,
388 			   wdg_timeout);
389 
390 	spin_lock_bh(&mvmsta->lock);
391 	mvmsta->tid_data[tid].txq_id = queue;
392 	mvmsta->tfd_queue_msk |= BIT(queue);
393 
394 	if (mvmsta->reserved_queue == queue)
395 		mvmsta->reserved_queue = IEEE80211_INVAL_HW_QUEUE;
396 	spin_unlock_bh(&mvmsta->lock);
397 
398 	ret = iwl_mvm_sta_send_to_fw(mvm, sta, true, STA_MODIFY_QUEUES);
399 	if (ret)
400 		goto out_err;
401 
402 	return 0;
403 
404 out_err:
405 	iwl_mvm_disable_txq(mvm, queue, mac_queue, tid, 0);
406 
407 	return ret;
408 }
409 
410 static inline u8 iwl_mvm_tid_to_ac_queue(int tid)
411 {
412 	if (tid == IWL_MAX_TID_COUNT)
413 		return IEEE80211_AC_VO; /* MGMT */
414 
415 	return tid_to_mac80211_ac[tid];
416 }
417 
418 static void iwl_mvm_tx_deferred_stream(struct iwl_mvm *mvm,
419 				       struct ieee80211_sta *sta, int tid)
420 {
421 	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
422 	struct iwl_mvm_tid_data *tid_data = &mvmsta->tid_data[tid];
423 	struct sk_buff *skb;
424 	struct ieee80211_hdr *hdr;
425 	struct sk_buff_head deferred_tx;
426 	u8 mac_queue;
427 	bool no_queue = false; /* Marks if there is a problem with the queue */
428 	u8 ac;
429 
430 	lockdep_assert_held(&mvm->mutex);
431 
432 	skb = skb_peek(&tid_data->deferred_tx_frames);
433 	if (!skb)
434 		return;
435 	hdr = (void *)skb->data;
436 
437 	ac = iwl_mvm_tid_to_ac_queue(tid);
438 	mac_queue = IEEE80211_SKB_CB(skb)->hw_queue;
439 
440 	if (tid_data->txq_id == IEEE80211_INVAL_HW_QUEUE &&
441 	    iwl_mvm_sta_alloc_queue(mvm, sta, ac, tid, hdr)) {
442 		IWL_ERR(mvm,
443 			"Can't alloc TXQ for sta %d tid %d - dropping frame\n",
444 			mvmsta->sta_id, tid);
445 
446 		/*
447 		 * Mark queue as problematic so later the deferred traffic is
448 		 * freed, as we can do nothing with it
449 		 */
450 		no_queue = true;
451 	}
452 
453 	__skb_queue_head_init(&deferred_tx);
454 
455 	/* Disable bottom-halves when entering TX path */
456 	local_bh_disable();
457 	spin_lock(&mvmsta->lock);
458 	skb_queue_splice_init(&tid_data->deferred_tx_frames, &deferred_tx);
459 	spin_unlock(&mvmsta->lock);
460 
461 	while ((skb = __skb_dequeue(&deferred_tx)))
462 		if (no_queue || iwl_mvm_tx_skb(mvm, skb, sta))
463 			ieee80211_free_txskb(mvm->hw, skb);
464 	local_bh_enable();
465 
466 	/* Wake queue */
467 	iwl_mvm_start_mac_queues(mvm, BIT(mac_queue));
468 }
469 
470 void iwl_mvm_add_new_dqa_stream_wk(struct work_struct *wk)
471 {
472 	struct iwl_mvm *mvm = container_of(wk, struct iwl_mvm,
473 					   add_stream_wk);
474 	struct ieee80211_sta *sta;
475 	struct iwl_mvm_sta *mvmsta;
476 	unsigned long deferred_tid_traffic;
477 	int sta_id, tid;
478 
479 	mutex_lock(&mvm->mutex);
480 
481 	/* Go over all stations with deferred traffic */
482 	for_each_set_bit(sta_id, mvm->sta_deferred_frames,
483 			 IWL_MVM_STATION_COUNT) {
484 		clear_bit(sta_id, mvm->sta_deferred_frames);
485 		sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[sta_id],
486 						lockdep_is_held(&mvm->mutex));
487 		if (IS_ERR_OR_NULL(sta))
488 			continue;
489 
490 		mvmsta = iwl_mvm_sta_from_mac80211(sta);
491 		deferred_tid_traffic = mvmsta->deferred_traffic_tid_map;
492 
493 		for_each_set_bit(tid, &deferred_tid_traffic,
494 				 IWL_MAX_TID_COUNT + 1)
495 			iwl_mvm_tx_deferred_stream(mvm, sta, tid);
496 	}
497 
498 	mutex_unlock(&mvm->mutex);
499 }
500 
501 static int iwl_mvm_reserve_sta_stream(struct iwl_mvm *mvm,
502 				      struct ieee80211_sta *sta,
503 				      enum nl80211_iftype vif_type)
504 {
505 	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
506 	int queue;
507 
508 	spin_lock_bh(&mvm->queue_info_lock);
509 
510 	/* Make sure we have free resources for this STA */
511 	if (vif_type == NL80211_IFTYPE_STATION && !sta->tdls &&
512 	    !mvm->queue_info[IWL_MVM_DQA_BSS_CLIENT_QUEUE].hw_queue_refcount &&
513 	    (mvm->queue_info[IWL_MVM_DQA_BSS_CLIENT_QUEUE].status ==
514 	     IWL_MVM_QUEUE_FREE))
515 		queue = IWL_MVM_DQA_BSS_CLIENT_QUEUE;
516 	else
517 		queue = iwl_mvm_find_free_queue(mvm, IWL_MVM_DQA_MIN_DATA_QUEUE,
518 						IWL_MVM_DQA_MAX_DATA_QUEUE);
519 	if (queue < 0) {
520 		spin_unlock_bh(&mvm->queue_info_lock);
521 		IWL_ERR(mvm, "No available queues for new station\n");
522 		return -ENOSPC;
523 	}
524 	mvm->queue_info[queue].status = IWL_MVM_QUEUE_RESERVED;
525 
526 	spin_unlock_bh(&mvm->queue_info_lock);
527 
528 	mvmsta->reserved_queue = queue;
529 
530 	IWL_DEBUG_TX_QUEUES(mvm, "Reserving data queue #%d for sta_id %d\n",
531 			    queue, mvmsta->sta_id);
532 
533 	return 0;
534 }
535 
536 int iwl_mvm_add_sta(struct iwl_mvm *mvm,
537 		    struct ieee80211_vif *vif,
538 		    struct ieee80211_sta *sta)
539 {
540 	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
541 	struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
542 	struct iwl_mvm_rxq_dup_data *dup_data;
543 	int i, ret, sta_id;
544 
545 	lockdep_assert_held(&mvm->mutex);
546 
547 	if (!test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status))
548 		sta_id = iwl_mvm_find_free_sta_id(mvm,
549 						  ieee80211_vif_type_p2p(vif));
550 	else
551 		sta_id = mvm_sta->sta_id;
552 
553 	if (sta_id == IWL_MVM_STATION_COUNT)
554 		return -ENOSPC;
555 
556 	spin_lock_init(&mvm_sta->lock);
557 
558 	mvm_sta->sta_id = sta_id;
559 	mvm_sta->mac_id_n_color = FW_CMD_ID_AND_COLOR(mvmvif->id,
560 						      mvmvif->color);
561 	mvm_sta->vif = vif;
562 	mvm_sta->max_agg_bufsize = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
563 	mvm_sta->tx_protection = 0;
564 	mvm_sta->tt_tx_protection = false;
565 
566 	/* HW restart, don't assume the memory has been zeroed */
567 	atomic_set(&mvm->pending_frames[sta_id], 0);
568 	mvm_sta->tid_disable_agg = 0xffff; /* No aggs at first */
569 	mvm_sta->tfd_queue_msk = 0;
570 
571 	/* allocate new queues for a TDLS station */
572 	if (sta->tdls) {
573 		ret = iwl_mvm_tdls_sta_init(mvm, sta);
574 		if (ret)
575 			return ret;
576 	} else if (!iwl_mvm_is_dqa_supported(mvm)) {
577 		for (i = 0; i < IEEE80211_NUM_ACS; i++)
578 			if (vif->hw_queue[i] != IEEE80211_INVAL_HW_QUEUE)
579 				mvm_sta->tfd_queue_msk |= BIT(vif->hw_queue[i]);
580 	}
581 
582 	/* for HW restart - reset everything but the sequence number */
583 	for (i = 0; i <= IWL_MAX_TID_COUNT; i++) {
584 		u16 seq = mvm_sta->tid_data[i].seq_number;
585 		memset(&mvm_sta->tid_data[i], 0, sizeof(mvm_sta->tid_data[i]));
586 		mvm_sta->tid_data[i].seq_number = seq;
587 
588 		if (!iwl_mvm_is_dqa_supported(mvm))
589 			continue;
590 
591 		/*
592 		 * Mark all queues for this STA as unallocated and defer TX
593 		 * frames until the queue is allocated
594 		 */
595 		mvm_sta->tid_data[i].txq_id = IEEE80211_INVAL_HW_QUEUE;
596 		skb_queue_head_init(&mvm_sta->tid_data[i].deferred_tx_frames);
597 	}
598 	mvm_sta->deferred_traffic_tid_map = 0;
599 	mvm_sta->agg_tids = 0;
600 
601 	if (iwl_mvm_has_new_rx_api(mvm) &&
602 	    !test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status)) {
603 		dup_data = kcalloc(mvm->trans->num_rx_queues,
604 				   sizeof(*dup_data),
605 				   GFP_KERNEL);
606 		if (!dup_data)
607 			return -ENOMEM;
608 		mvm_sta->dup_data = dup_data;
609 	}
610 
611 	if (iwl_mvm_is_dqa_supported(mvm)) {
612 		ret = iwl_mvm_reserve_sta_stream(mvm, sta,
613 						 ieee80211_vif_type_p2p(vif));
614 		if (ret)
615 			goto err;
616 	}
617 
618 	ret = iwl_mvm_sta_send_to_fw(mvm, sta, false, 0);
619 	if (ret)
620 		goto err;
621 
622 	if (vif->type == NL80211_IFTYPE_STATION) {
623 		if (!sta->tdls) {
624 			WARN_ON(mvmvif->ap_sta_id != IWL_MVM_STATION_COUNT);
625 			mvmvif->ap_sta_id = sta_id;
626 		} else {
627 			WARN_ON(mvmvif->ap_sta_id == IWL_MVM_STATION_COUNT);
628 		}
629 	}
630 
631 	rcu_assign_pointer(mvm->fw_id_to_mac_id[sta_id], sta);
632 
633 	return 0;
634 
635 err:
636 	iwl_mvm_tdls_sta_deinit(mvm, sta);
637 	return ret;
638 }
639 
640 int iwl_mvm_update_sta(struct iwl_mvm *mvm,
641 		       struct ieee80211_vif *vif,
642 		       struct ieee80211_sta *sta)
643 {
644 	return iwl_mvm_sta_send_to_fw(mvm, sta, true, 0);
645 }
646 
647 int iwl_mvm_drain_sta(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
648 		      bool drain)
649 {
650 	struct iwl_mvm_add_sta_cmd cmd = {};
651 	int ret;
652 	u32 status;
653 
654 	lockdep_assert_held(&mvm->mutex);
655 
656 	cmd.mac_id_n_color = cpu_to_le32(mvmsta->mac_id_n_color);
657 	cmd.sta_id = mvmsta->sta_id;
658 	cmd.add_modify = STA_MODE_MODIFY;
659 	cmd.station_flags = drain ? cpu_to_le32(STA_FLG_DRAIN_FLOW) : 0;
660 	cmd.station_flags_msk = cpu_to_le32(STA_FLG_DRAIN_FLOW);
661 
662 	status = ADD_STA_SUCCESS;
663 	ret = iwl_mvm_send_cmd_pdu_status(mvm, ADD_STA,
664 					  iwl_mvm_add_sta_cmd_size(mvm),
665 					  &cmd, &status);
666 	if (ret)
667 		return ret;
668 
669 	switch (status & IWL_ADD_STA_STATUS_MASK) {
670 	case ADD_STA_SUCCESS:
671 		IWL_DEBUG_INFO(mvm, "Frames for staid %d will drained in fw\n",
672 			       mvmsta->sta_id);
673 		break;
674 	default:
675 		ret = -EIO;
676 		IWL_ERR(mvm, "Couldn't drain frames for staid %d\n",
677 			mvmsta->sta_id);
678 		break;
679 	}
680 
681 	return ret;
682 }
683 
684 /*
685  * Remove a station from the FW table. Before sending the command to remove
686  * the station validate that the station is indeed known to the driver (sanity
687  * only).
688  */
689 static int iwl_mvm_rm_sta_common(struct iwl_mvm *mvm, u8 sta_id)
690 {
691 	struct ieee80211_sta *sta;
692 	struct iwl_mvm_rm_sta_cmd rm_sta_cmd = {
693 		.sta_id = sta_id,
694 	};
695 	int ret;
696 
697 	sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[sta_id],
698 					lockdep_is_held(&mvm->mutex));
699 
700 	/* Note: internal stations are marked as error values */
701 	if (!sta) {
702 		IWL_ERR(mvm, "Invalid station id\n");
703 		return -EINVAL;
704 	}
705 
706 	ret = iwl_mvm_send_cmd_pdu(mvm, REMOVE_STA, 0,
707 				   sizeof(rm_sta_cmd), &rm_sta_cmd);
708 	if (ret) {
709 		IWL_ERR(mvm, "Failed to remove station. Id=%d\n", sta_id);
710 		return ret;
711 	}
712 
713 	return 0;
714 }
715 
716 void iwl_mvm_sta_drained_wk(struct work_struct *wk)
717 {
718 	struct iwl_mvm *mvm = container_of(wk, struct iwl_mvm, sta_drained_wk);
719 	u8 sta_id;
720 
721 	/*
722 	 * The mutex is needed because of the SYNC cmd, but not only: if the
723 	 * work would run concurrently with iwl_mvm_rm_sta, it would run before
724 	 * iwl_mvm_rm_sta sets the station as busy, and exit. Then
725 	 * iwl_mvm_rm_sta would set the station as busy, and nobody will clean
726 	 * that later.
727 	 */
728 	mutex_lock(&mvm->mutex);
729 
730 	for_each_set_bit(sta_id, mvm->sta_drained, IWL_MVM_STATION_COUNT) {
731 		int ret;
732 		struct ieee80211_sta *sta =
733 			rcu_dereference_protected(mvm->fw_id_to_mac_id[sta_id],
734 						  lockdep_is_held(&mvm->mutex));
735 
736 		/*
737 		 * This station is in use or RCU-removed; the latter happens in
738 		 * managed mode, where mac80211 removes the station before we
739 		 * can remove it from firmware (we can only do that after the
740 		 * MAC is marked unassociated), and possibly while the deauth
741 		 * frame to disconnect from the AP is still queued. Then, the
742 		 * station pointer is -ENOENT when the last skb is reclaimed.
743 		 */
744 		if (!IS_ERR(sta) || PTR_ERR(sta) == -ENOENT)
745 			continue;
746 
747 		if (PTR_ERR(sta) == -EINVAL) {
748 			IWL_ERR(mvm, "Drained sta %d, but it is internal?\n",
749 				sta_id);
750 			continue;
751 		}
752 
753 		if (!sta) {
754 			IWL_ERR(mvm, "Drained sta %d, but it was NULL?\n",
755 				sta_id);
756 			continue;
757 		}
758 
759 		WARN_ON(PTR_ERR(sta) != -EBUSY);
760 		/* This station was removed and we waited until it got drained,
761 		 * we can now proceed and remove it.
762 		 */
763 		ret = iwl_mvm_rm_sta_common(mvm, sta_id);
764 		if (ret) {
765 			IWL_ERR(mvm,
766 				"Couldn't remove sta %d after it was drained\n",
767 				sta_id);
768 			continue;
769 		}
770 		RCU_INIT_POINTER(mvm->fw_id_to_mac_id[sta_id], NULL);
771 		clear_bit(sta_id, mvm->sta_drained);
772 
773 		if (mvm->tfd_drained[sta_id]) {
774 			unsigned long i, msk = mvm->tfd_drained[sta_id];
775 
776 			for_each_set_bit(i, &msk, sizeof(msk) * BITS_PER_BYTE)
777 				iwl_mvm_disable_txq(mvm, i, i,
778 						    IWL_MAX_TID_COUNT, 0);
779 
780 			mvm->tfd_drained[sta_id] = 0;
781 			IWL_DEBUG_TDLS(mvm, "Drained sta %d, with queues %ld\n",
782 				       sta_id, msk);
783 		}
784 	}
785 
786 	mutex_unlock(&mvm->mutex);
787 }
788 
789 static void iwl_mvm_disable_sta_queues(struct iwl_mvm *mvm,
790 				       struct ieee80211_vif *vif,
791 				       struct iwl_mvm_sta *mvm_sta)
792 {
793 	int ac;
794 	int i;
795 
796 	lockdep_assert_held(&mvm->mutex);
797 
798 	for (i = 0; i < ARRAY_SIZE(mvm_sta->tid_data); i++) {
799 		if (mvm_sta->tid_data[i].txq_id == IEEE80211_INVAL_HW_QUEUE)
800 			continue;
801 
802 		ac = iwl_mvm_tid_to_ac_queue(i);
803 		iwl_mvm_disable_txq(mvm, mvm_sta->tid_data[i].txq_id,
804 				    vif->hw_queue[ac], i, 0);
805 		mvm_sta->tid_data[i].txq_id = IEEE80211_INVAL_HW_QUEUE;
806 	}
807 }
808 
809 int iwl_mvm_rm_sta(struct iwl_mvm *mvm,
810 		   struct ieee80211_vif *vif,
811 		   struct ieee80211_sta *sta)
812 {
813 	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
814 	struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
815 	int ret;
816 
817 	lockdep_assert_held(&mvm->mutex);
818 
819 	if (iwl_mvm_has_new_rx_api(mvm))
820 		kfree(mvm_sta->dup_data);
821 
822 	if (vif->type == NL80211_IFTYPE_STATION &&
823 	    mvmvif->ap_sta_id == mvm_sta->sta_id) {
824 		ret = iwl_mvm_drain_sta(mvm, mvm_sta, true);
825 		if (ret)
826 			return ret;
827 		/* flush its queues here since we are freeing mvm_sta */
828 		ret = iwl_mvm_flush_tx_path(mvm, mvm_sta->tfd_queue_msk, 0);
829 		if (ret)
830 			return ret;
831 		ret = iwl_trans_wait_tx_queue_empty(mvm->trans,
832 						    mvm_sta->tfd_queue_msk);
833 		if (ret)
834 			return ret;
835 		ret = iwl_mvm_drain_sta(mvm, mvm_sta, false);
836 
837 		/* If DQA is supported - the queues can be disabled now */
838 		if (iwl_mvm_is_dqa_supported(mvm))
839 			iwl_mvm_disable_sta_queues(mvm, vif, mvm_sta);
840 
841 		/* if we are associated - we can't remove the AP STA now */
842 		if (vif->bss_conf.assoc)
843 			return ret;
844 
845 		/* unassoc - go ahead - remove the AP STA now */
846 		mvmvif->ap_sta_id = IWL_MVM_STATION_COUNT;
847 
848 		/* clear d0i3_ap_sta_id if no longer relevant */
849 		if (mvm->d0i3_ap_sta_id == mvm_sta->sta_id)
850 			mvm->d0i3_ap_sta_id = IWL_MVM_STATION_COUNT;
851 	}
852 
853 	/*
854 	 * This shouldn't happen - the TDLS channel switch should be canceled
855 	 * before the STA is removed.
856 	 */
857 	if (WARN_ON_ONCE(mvm->tdls_cs.peer.sta_id == mvm_sta->sta_id)) {
858 		mvm->tdls_cs.peer.sta_id = IWL_MVM_STATION_COUNT;
859 		cancel_delayed_work(&mvm->tdls_cs.dwork);
860 	}
861 
862 	/*
863 	 * Make sure that the tx response code sees the station as -EBUSY and
864 	 * calls the drain worker.
865 	 */
866 	spin_lock_bh(&mvm_sta->lock);
867 	/*
868 	 * There are frames pending on the AC queues for this station.
869 	 * We need to wait until all the frames are drained...
870 	 */
871 	if (atomic_read(&mvm->pending_frames[mvm_sta->sta_id])) {
872 		rcu_assign_pointer(mvm->fw_id_to_mac_id[mvm_sta->sta_id],
873 				   ERR_PTR(-EBUSY));
874 		spin_unlock_bh(&mvm_sta->lock);
875 
876 		/* disable TDLS sta queues on drain complete */
877 		if (sta->tdls) {
878 			mvm->tfd_drained[mvm_sta->sta_id] =
879 							mvm_sta->tfd_queue_msk;
880 			IWL_DEBUG_TDLS(mvm, "Draining TDLS sta %d\n",
881 				       mvm_sta->sta_id);
882 		}
883 
884 		ret = iwl_mvm_drain_sta(mvm, mvm_sta, true);
885 	} else {
886 		spin_unlock_bh(&mvm_sta->lock);
887 
888 		if (sta->tdls)
889 			iwl_mvm_tdls_sta_deinit(mvm, sta);
890 
891 		ret = iwl_mvm_rm_sta_common(mvm, mvm_sta->sta_id);
892 		RCU_INIT_POINTER(mvm->fw_id_to_mac_id[mvm_sta->sta_id], NULL);
893 	}
894 
895 	return ret;
896 }
897 
898 int iwl_mvm_rm_sta_id(struct iwl_mvm *mvm,
899 		      struct ieee80211_vif *vif,
900 		      u8 sta_id)
901 {
902 	int ret = iwl_mvm_rm_sta_common(mvm, sta_id);
903 
904 	lockdep_assert_held(&mvm->mutex);
905 
906 	RCU_INIT_POINTER(mvm->fw_id_to_mac_id[sta_id], NULL);
907 	return ret;
908 }
909 
910 int iwl_mvm_allocate_int_sta(struct iwl_mvm *mvm,
911 			     struct iwl_mvm_int_sta *sta,
912 			     u32 qmask, enum nl80211_iftype iftype)
913 {
914 	if (!test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status)) {
915 		sta->sta_id = iwl_mvm_find_free_sta_id(mvm, iftype);
916 		if (WARN_ON_ONCE(sta->sta_id == IWL_MVM_STATION_COUNT))
917 			return -ENOSPC;
918 	}
919 
920 	sta->tfd_queue_msk = qmask;
921 
922 	/* put a non-NULL value so iterating over the stations won't stop */
923 	rcu_assign_pointer(mvm->fw_id_to_mac_id[sta->sta_id], ERR_PTR(-EINVAL));
924 	return 0;
925 }
926 
927 static void iwl_mvm_dealloc_int_sta(struct iwl_mvm *mvm,
928 				    struct iwl_mvm_int_sta *sta)
929 {
930 	RCU_INIT_POINTER(mvm->fw_id_to_mac_id[sta->sta_id], NULL);
931 	memset(sta, 0, sizeof(struct iwl_mvm_int_sta));
932 	sta->sta_id = IWL_MVM_STATION_COUNT;
933 }
934 
935 static int iwl_mvm_add_int_sta_common(struct iwl_mvm *mvm,
936 				      struct iwl_mvm_int_sta *sta,
937 				      const u8 *addr,
938 				      u16 mac_id, u16 color)
939 {
940 	struct iwl_mvm_add_sta_cmd cmd;
941 	int ret;
942 	u32 status;
943 
944 	lockdep_assert_held(&mvm->mutex);
945 
946 	memset(&cmd, 0, sizeof(cmd));
947 	cmd.sta_id = sta->sta_id;
948 	cmd.mac_id_n_color = cpu_to_le32(FW_CMD_ID_AND_COLOR(mac_id,
949 							     color));
950 
951 	cmd.tfd_queue_msk = cpu_to_le32(sta->tfd_queue_msk);
952 	cmd.tid_disable_tx = cpu_to_le16(0xffff);
953 
954 	if (addr)
955 		memcpy(cmd.addr, addr, ETH_ALEN);
956 
957 	ret = iwl_mvm_send_cmd_pdu_status(mvm, ADD_STA,
958 					  iwl_mvm_add_sta_cmd_size(mvm),
959 					  &cmd, &status);
960 	if (ret)
961 		return ret;
962 
963 	switch (status & IWL_ADD_STA_STATUS_MASK) {
964 	case ADD_STA_SUCCESS:
965 		IWL_DEBUG_INFO(mvm, "Internal station added.\n");
966 		return 0;
967 	default:
968 		ret = -EIO;
969 		IWL_ERR(mvm, "Add internal station failed, status=0x%x\n",
970 			status);
971 		break;
972 	}
973 	return ret;
974 }
975 
976 int iwl_mvm_add_aux_sta(struct iwl_mvm *mvm)
977 {
978 	unsigned int wdg_timeout = iwlmvm_mod_params.tfd_q_hang_detect ?
979 					mvm->cfg->base_params->wd_timeout :
980 					IWL_WATCHDOG_DISABLED;
981 	int ret;
982 
983 	lockdep_assert_held(&mvm->mutex);
984 
985 	/* Map Aux queue to fifo - needs to happen before adding Aux station */
986 	iwl_mvm_enable_ac_txq(mvm, mvm->aux_queue, mvm->aux_queue,
987 			      IWL_MVM_TX_FIFO_MCAST, 0, wdg_timeout);
988 
989 	/* Allocate aux station and assign to it the aux queue */
990 	ret = iwl_mvm_allocate_int_sta(mvm, &mvm->aux_sta, BIT(mvm->aux_queue),
991 				       NL80211_IFTYPE_UNSPECIFIED);
992 	if (ret)
993 		return ret;
994 
995 	ret = iwl_mvm_add_int_sta_common(mvm, &mvm->aux_sta, NULL,
996 					 MAC_INDEX_AUX, 0);
997 
998 	if (ret)
999 		iwl_mvm_dealloc_int_sta(mvm, &mvm->aux_sta);
1000 	return ret;
1001 }
1002 
1003 int iwl_mvm_add_snif_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
1004 {
1005 	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
1006 
1007 	lockdep_assert_held(&mvm->mutex);
1008 	return iwl_mvm_add_int_sta_common(mvm, &mvm->snif_sta, vif->addr,
1009 					 mvmvif->id, 0);
1010 }
1011 
1012 int iwl_mvm_rm_snif_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
1013 {
1014 	int ret;
1015 
1016 	lockdep_assert_held(&mvm->mutex);
1017 
1018 	ret = iwl_mvm_rm_sta_common(mvm, mvm->snif_sta.sta_id);
1019 	if (ret)
1020 		IWL_WARN(mvm, "Failed sending remove station\n");
1021 
1022 	return ret;
1023 }
1024 
1025 void iwl_mvm_dealloc_snif_sta(struct iwl_mvm *mvm)
1026 {
1027 	iwl_mvm_dealloc_int_sta(mvm, &mvm->snif_sta);
1028 }
1029 
1030 void iwl_mvm_del_aux_sta(struct iwl_mvm *mvm)
1031 {
1032 	lockdep_assert_held(&mvm->mutex);
1033 
1034 	iwl_mvm_dealloc_int_sta(mvm, &mvm->aux_sta);
1035 }
1036 
1037 /*
1038  * Send the add station command for the vif's broadcast station.
1039  * Assumes that the station was already allocated.
1040  *
1041  * @mvm: the mvm component
1042  * @vif: the interface to which the broadcast station is added
1043  * @bsta: the broadcast station to add.
1044  */
1045 int iwl_mvm_send_add_bcast_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
1046 {
1047 	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
1048 	struct iwl_mvm_int_sta *bsta = &mvmvif->bcast_sta;
1049 	static const u8 _baddr[] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
1050 	const u8 *baddr = _baddr;
1051 
1052 	lockdep_assert_held(&mvm->mutex);
1053 
1054 	if (iwl_mvm_is_dqa_supported(mvm)) {
1055 		struct iwl_trans_txq_scd_cfg cfg = {
1056 			.fifo = IWL_MVM_TX_FIFO_VO,
1057 			.sta_id = mvmvif->bcast_sta.sta_id,
1058 			.tid = IWL_MAX_TID_COUNT,
1059 			.aggregate = false,
1060 			.frame_limit = IWL_FRAME_LIMIT,
1061 		};
1062 		unsigned int wdg_timeout =
1063 			iwl_mvm_get_wd_timeout(mvm, vif, false, false);
1064 		int queue;
1065 
1066 		if ((vif->type == NL80211_IFTYPE_AP) &&
1067 		    (mvmvif->bcast_sta.tfd_queue_msk &
1068 		     BIT(IWL_MVM_DQA_AP_PROBE_RESP_QUEUE)))
1069 			queue = IWL_MVM_DQA_AP_PROBE_RESP_QUEUE;
1070 		else if ((vif->type == NL80211_IFTYPE_P2P_DEVICE) &&
1071 			 (mvmvif->bcast_sta.tfd_queue_msk &
1072 			  BIT(IWL_MVM_DQA_P2P_DEVICE_QUEUE)))
1073 			queue = IWL_MVM_DQA_P2P_DEVICE_QUEUE;
1074 		else if (WARN(1, "Missed required TXQ for adding bcast STA\n"))
1075 			return -EINVAL;
1076 
1077 		iwl_mvm_enable_txq(mvm, queue, vif->hw_queue[0], 0, &cfg,
1078 				   wdg_timeout);
1079 	}
1080 
1081 	if (vif->type == NL80211_IFTYPE_ADHOC)
1082 		baddr = vif->bss_conf.bssid;
1083 
1084 	if (WARN_ON_ONCE(bsta->sta_id == IWL_MVM_STATION_COUNT))
1085 		return -ENOSPC;
1086 
1087 	return iwl_mvm_add_int_sta_common(mvm, bsta, baddr,
1088 					  mvmvif->id, mvmvif->color);
1089 }
1090 
1091 /* Send the FW a request to remove the station from it's internal data
1092  * structures, but DO NOT remove the entry from the local data structures. */
1093 int iwl_mvm_send_rm_bcast_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
1094 {
1095 	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
1096 	int ret;
1097 
1098 	lockdep_assert_held(&mvm->mutex);
1099 
1100 	ret = iwl_mvm_rm_sta_common(mvm, mvmvif->bcast_sta.sta_id);
1101 	if (ret)
1102 		IWL_WARN(mvm, "Failed sending remove station\n");
1103 	return ret;
1104 }
1105 
1106 int iwl_mvm_alloc_bcast_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
1107 {
1108 	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
1109 	u32 qmask = 0;
1110 
1111 	lockdep_assert_held(&mvm->mutex);
1112 
1113 	if (!iwl_mvm_is_dqa_supported(mvm))
1114 		qmask = iwl_mvm_mac_get_queues_mask(vif);
1115 
1116 	if (vif->type == NL80211_IFTYPE_AP) {
1117 		/*
1118 		 * The firmware defines the TFD queue mask to only be relevant
1119 		 * for *unicast* queues, so the multicast (CAB) queue shouldn't
1120 		 * be included.
1121 		 */
1122 		qmask &= ~BIT(vif->cab_queue);
1123 
1124 		if (iwl_mvm_is_dqa_supported(mvm))
1125 			qmask |= BIT(IWL_MVM_DQA_AP_PROBE_RESP_QUEUE);
1126 	} else if (iwl_mvm_is_dqa_supported(mvm) &&
1127 		   vif->type == NL80211_IFTYPE_P2P_DEVICE) {
1128 		qmask |= BIT(IWL_MVM_DQA_P2P_DEVICE_QUEUE);
1129 	}
1130 
1131 	return iwl_mvm_allocate_int_sta(mvm, &mvmvif->bcast_sta, qmask,
1132 					ieee80211_vif_type_p2p(vif));
1133 }
1134 
1135 /* Allocate a new station entry for the broadcast station to the given vif,
1136  * and send it to the FW.
1137  * Note that each P2P mac should have its own broadcast station.
1138  *
1139  * @mvm: the mvm component
1140  * @vif: the interface to which the broadcast station is added
1141  * @bsta: the broadcast station to add. */
1142 int iwl_mvm_add_bcast_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
1143 {
1144 	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
1145 	struct iwl_mvm_int_sta *bsta = &mvmvif->bcast_sta;
1146 	int ret;
1147 
1148 	lockdep_assert_held(&mvm->mutex);
1149 
1150 	ret = iwl_mvm_alloc_bcast_sta(mvm, vif);
1151 	if (ret)
1152 		return ret;
1153 
1154 	ret = iwl_mvm_send_add_bcast_sta(mvm, vif);
1155 
1156 	if (ret)
1157 		iwl_mvm_dealloc_int_sta(mvm, bsta);
1158 
1159 	return ret;
1160 }
1161 
1162 void iwl_mvm_dealloc_bcast_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
1163 {
1164 	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
1165 
1166 	iwl_mvm_dealloc_int_sta(mvm, &mvmvif->bcast_sta);
1167 }
1168 
1169 /*
1170  * Send the FW a request to remove the station from it's internal data
1171  * structures, and in addition remove it from the local data structure.
1172  */
1173 int iwl_mvm_rm_bcast_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
1174 {
1175 	int ret;
1176 
1177 	lockdep_assert_held(&mvm->mutex);
1178 
1179 	ret = iwl_mvm_send_rm_bcast_sta(mvm, vif);
1180 
1181 	iwl_mvm_dealloc_bcast_sta(mvm, vif);
1182 
1183 	return ret;
1184 }
1185 
1186 #define IWL_MAX_RX_BA_SESSIONS 16
1187 
1188 static void iwl_mvm_sync_rxq_del_ba(struct iwl_mvm *mvm, u8 baid)
1189 {
1190 	struct iwl_mvm_delba_notif notif = {
1191 		.metadata.type = IWL_MVM_RXQ_NOTIF_DEL_BA,
1192 		.metadata.sync = 1,
1193 		.delba.baid = baid,
1194 	};
1195 	iwl_mvm_sync_rx_queues_internal(mvm, (void *)&notif, sizeof(notif));
1196 };
1197 
1198 static void iwl_mvm_free_reorder(struct iwl_mvm *mvm,
1199 				 struct iwl_mvm_baid_data *data)
1200 {
1201 	int i;
1202 
1203 	iwl_mvm_sync_rxq_del_ba(mvm, data->baid);
1204 
1205 	for (i = 0; i < mvm->trans->num_rx_queues; i++) {
1206 		int j;
1207 		struct iwl_mvm_reorder_buffer *reorder_buf =
1208 			&data->reorder_buf[i];
1209 
1210 		spin_lock_bh(&reorder_buf->lock);
1211 		if (likely(!reorder_buf->num_stored)) {
1212 			spin_unlock_bh(&reorder_buf->lock);
1213 			continue;
1214 		}
1215 
1216 		/*
1217 		 * This shouldn't happen in regular DELBA since the internal
1218 		 * delBA notification should trigger a release of all frames in
1219 		 * the reorder buffer.
1220 		 */
1221 		WARN_ON(1);
1222 
1223 		for (j = 0; j < reorder_buf->buf_size; j++)
1224 			__skb_queue_purge(&reorder_buf->entries[j]);
1225 		/*
1226 		 * Prevent timer re-arm. This prevents a very far fetched case
1227 		 * where we timed out on the notification. There may be prior
1228 		 * RX frames pending in the RX queue before the notification
1229 		 * that might get processed between now and the actual deletion
1230 		 * and we would re-arm the timer although we are deleting the
1231 		 * reorder buffer.
1232 		 */
1233 		reorder_buf->removed = true;
1234 		spin_unlock_bh(&reorder_buf->lock);
1235 		del_timer_sync(&reorder_buf->reorder_timer);
1236 	}
1237 }
1238 
1239 static void iwl_mvm_init_reorder_buffer(struct iwl_mvm *mvm,
1240 					u32 sta_id,
1241 					struct iwl_mvm_baid_data *data,
1242 					u16 ssn, u8 buf_size)
1243 {
1244 	int i;
1245 
1246 	for (i = 0; i < mvm->trans->num_rx_queues; i++) {
1247 		struct iwl_mvm_reorder_buffer *reorder_buf =
1248 			&data->reorder_buf[i];
1249 		int j;
1250 
1251 		reorder_buf->num_stored = 0;
1252 		reorder_buf->head_sn = ssn;
1253 		reorder_buf->buf_size = buf_size;
1254 		/* rx reorder timer */
1255 		reorder_buf->reorder_timer.function =
1256 			iwl_mvm_reorder_timer_expired;
1257 		reorder_buf->reorder_timer.data = (unsigned long)reorder_buf;
1258 		init_timer(&reorder_buf->reorder_timer);
1259 		spin_lock_init(&reorder_buf->lock);
1260 		reorder_buf->mvm = mvm;
1261 		reorder_buf->queue = i;
1262 		reorder_buf->sta_id = sta_id;
1263 		for (j = 0; j < reorder_buf->buf_size; j++)
1264 			__skb_queue_head_init(&reorder_buf->entries[j]);
1265 	}
1266 }
1267 
1268 int iwl_mvm_sta_rx_agg(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1269 		       int tid, u16 ssn, bool start, u8 buf_size, u16 timeout)
1270 {
1271 	struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
1272 	struct iwl_mvm_add_sta_cmd cmd = {};
1273 	struct iwl_mvm_baid_data *baid_data = NULL;
1274 	int ret;
1275 	u32 status;
1276 
1277 	lockdep_assert_held(&mvm->mutex);
1278 
1279 	if (start && mvm->rx_ba_sessions >= IWL_MAX_RX_BA_SESSIONS) {
1280 		IWL_WARN(mvm, "Not enough RX BA SESSIONS\n");
1281 		return -ENOSPC;
1282 	}
1283 
1284 	if (iwl_mvm_has_new_rx_api(mvm) && start) {
1285 		/*
1286 		 * Allocate here so if allocation fails we can bail out early
1287 		 * before starting the BA session in the firmware
1288 		 */
1289 		baid_data = kzalloc(sizeof(*baid_data) +
1290 				    mvm->trans->num_rx_queues *
1291 				    sizeof(baid_data->reorder_buf[0]),
1292 				    GFP_KERNEL);
1293 		if (!baid_data)
1294 			return -ENOMEM;
1295 	}
1296 
1297 	cmd.mac_id_n_color = cpu_to_le32(mvm_sta->mac_id_n_color);
1298 	cmd.sta_id = mvm_sta->sta_id;
1299 	cmd.add_modify = STA_MODE_MODIFY;
1300 	if (start) {
1301 		cmd.add_immediate_ba_tid = (u8) tid;
1302 		cmd.add_immediate_ba_ssn = cpu_to_le16(ssn);
1303 		cmd.rx_ba_window = cpu_to_le16((u16)buf_size);
1304 	} else {
1305 		cmd.remove_immediate_ba_tid = (u8) tid;
1306 	}
1307 	cmd.modify_mask = start ? STA_MODIFY_ADD_BA_TID :
1308 				  STA_MODIFY_REMOVE_BA_TID;
1309 
1310 	status = ADD_STA_SUCCESS;
1311 	ret = iwl_mvm_send_cmd_pdu_status(mvm, ADD_STA,
1312 					  iwl_mvm_add_sta_cmd_size(mvm),
1313 					  &cmd, &status);
1314 	if (ret)
1315 		goto out_free;
1316 
1317 	switch (status & IWL_ADD_STA_STATUS_MASK) {
1318 	case ADD_STA_SUCCESS:
1319 		IWL_DEBUG_INFO(mvm, "RX BA Session %sed in fw\n",
1320 			       start ? "start" : "stopp");
1321 		break;
1322 	case ADD_STA_IMMEDIATE_BA_FAILURE:
1323 		IWL_WARN(mvm, "RX BA Session refused by fw\n");
1324 		ret = -ENOSPC;
1325 		break;
1326 	default:
1327 		ret = -EIO;
1328 		IWL_ERR(mvm, "RX BA Session failed %sing, status 0x%x\n",
1329 			start ? "start" : "stopp", status);
1330 		break;
1331 	}
1332 
1333 	if (ret)
1334 		goto out_free;
1335 
1336 	if (start) {
1337 		u8 baid;
1338 
1339 		mvm->rx_ba_sessions++;
1340 
1341 		if (!iwl_mvm_has_new_rx_api(mvm))
1342 			return 0;
1343 
1344 		if (WARN_ON(!(status & IWL_ADD_STA_BAID_VALID_MASK))) {
1345 			ret = -EINVAL;
1346 			goto out_free;
1347 		}
1348 		baid = (u8)((status & IWL_ADD_STA_BAID_MASK) >>
1349 			    IWL_ADD_STA_BAID_SHIFT);
1350 		baid_data->baid = baid;
1351 		baid_data->timeout = timeout;
1352 		baid_data->last_rx = jiffies;
1353 		init_timer(&baid_data->session_timer);
1354 		baid_data->session_timer.function =
1355 			iwl_mvm_rx_agg_session_expired;
1356 		baid_data->session_timer.data =
1357 			(unsigned long)&mvm->baid_map[baid];
1358 		baid_data->mvm = mvm;
1359 		baid_data->tid = tid;
1360 		baid_data->sta_id = mvm_sta->sta_id;
1361 
1362 		mvm_sta->tid_to_baid[tid] = baid;
1363 		if (timeout)
1364 			mod_timer(&baid_data->session_timer,
1365 				  TU_TO_EXP_TIME(timeout * 2));
1366 
1367 		iwl_mvm_init_reorder_buffer(mvm, mvm_sta->sta_id,
1368 					    baid_data, ssn, buf_size);
1369 		/*
1370 		 * protect the BA data with RCU to cover a case where our
1371 		 * internal RX sync mechanism will timeout (not that it's
1372 		 * supposed to happen) and we will free the session data while
1373 		 * RX is being processed in parallel
1374 		 */
1375 		WARN_ON(rcu_access_pointer(mvm->baid_map[baid]));
1376 		rcu_assign_pointer(mvm->baid_map[baid], baid_data);
1377 	} else if (mvm->rx_ba_sessions > 0) {
1378 		u8 baid = mvm_sta->tid_to_baid[tid];
1379 
1380 		/* check that restart flow didn't zero the counter */
1381 		mvm->rx_ba_sessions--;
1382 		if (!iwl_mvm_has_new_rx_api(mvm))
1383 			return 0;
1384 
1385 		if (WARN_ON(baid == IWL_RX_REORDER_DATA_INVALID_BAID))
1386 			return -EINVAL;
1387 
1388 		baid_data = rcu_access_pointer(mvm->baid_map[baid]);
1389 		if (WARN_ON(!baid_data))
1390 			return -EINVAL;
1391 
1392 		/* synchronize all rx queues so we can safely delete */
1393 		iwl_mvm_free_reorder(mvm, baid_data);
1394 		del_timer_sync(&baid_data->session_timer);
1395 		RCU_INIT_POINTER(mvm->baid_map[baid], NULL);
1396 		kfree_rcu(baid_data, rcu_head);
1397 	}
1398 	return 0;
1399 
1400 out_free:
1401 	kfree(baid_data);
1402 	return ret;
1403 }
1404 
1405 static int iwl_mvm_sta_tx_agg(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1406 			      int tid, u8 queue, bool start)
1407 {
1408 	struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
1409 	struct iwl_mvm_add_sta_cmd cmd = {};
1410 	int ret;
1411 	u32 status;
1412 
1413 	lockdep_assert_held(&mvm->mutex);
1414 
1415 	if (start) {
1416 		mvm_sta->tfd_queue_msk |= BIT(queue);
1417 		mvm_sta->tid_disable_agg &= ~BIT(tid);
1418 	} else {
1419 		/* In DQA-mode the queue isn't removed on agg termination */
1420 		if (!iwl_mvm_is_dqa_supported(mvm))
1421 			mvm_sta->tfd_queue_msk &= ~BIT(queue);
1422 		mvm_sta->tid_disable_agg |= BIT(tid);
1423 	}
1424 
1425 	cmd.mac_id_n_color = cpu_to_le32(mvm_sta->mac_id_n_color);
1426 	cmd.sta_id = mvm_sta->sta_id;
1427 	cmd.add_modify = STA_MODE_MODIFY;
1428 	cmd.modify_mask = STA_MODIFY_QUEUES | STA_MODIFY_TID_DISABLE_TX;
1429 	cmd.tfd_queue_msk = cpu_to_le32(mvm_sta->tfd_queue_msk);
1430 	cmd.tid_disable_tx = cpu_to_le16(mvm_sta->tid_disable_agg);
1431 
1432 	status = ADD_STA_SUCCESS;
1433 	ret = iwl_mvm_send_cmd_pdu_status(mvm, ADD_STA,
1434 					  iwl_mvm_add_sta_cmd_size(mvm),
1435 					  &cmd, &status);
1436 	if (ret)
1437 		return ret;
1438 
1439 	switch (status & IWL_ADD_STA_STATUS_MASK) {
1440 	case ADD_STA_SUCCESS:
1441 		break;
1442 	default:
1443 		ret = -EIO;
1444 		IWL_ERR(mvm, "TX BA Session failed %sing, status 0x%x\n",
1445 			start ? "start" : "stopp", status);
1446 		break;
1447 	}
1448 
1449 	return ret;
1450 }
1451 
1452 const u8 tid_to_mac80211_ac[] = {
1453 	IEEE80211_AC_BE,
1454 	IEEE80211_AC_BK,
1455 	IEEE80211_AC_BK,
1456 	IEEE80211_AC_BE,
1457 	IEEE80211_AC_VI,
1458 	IEEE80211_AC_VI,
1459 	IEEE80211_AC_VO,
1460 	IEEE80211_AC_VO,
1461 };
1462 
1463 static const u8 tid_to_ucode_ac[] = {
1464 	AC_BE,
1465 	AC_BK,
1466 	AC_BK,
1467 	AC_BE,
1468 	AC_VI,
1469 	AC_VI,
1470 	AC_VO,
1471 	AC_VO,
1472 };
1473 
1474 int iwl_mvm_sta_tx_agg_start(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1475 			     struct ieee80211_sta *sta, u16 tid, u16 *ssn)
1476 {
1477 	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1478 	struct iwl_mvm_tid_data *tid_data;
1479 	int txq_id;
1480 	int ret;
1481 
1482 	if (WARN_ON_ONCE(tid >= IWL_MAX_TID_COUNT))
1483 		return -EINVAL;
1484 
1485 	if (mvmsta->tid_data[tid].state != IWL_AGG_OFF) {
1486 		IWL_ERR(mvm, "Start AGG when state is not IWL_AGG_OFF %d!\n",
1487 			mvmsta->tid_data[tid].state);
1488 		return -ENXIO;
1489 	}
1490 
1491 	lockdep_assert_held(&mvm->mutex);
1492 
1493 	spin_lock_bh(&mvmsta->lock);
1494 
1495 	/* possible race condition - we entered D0i3 while starting agg */
1496 	if (test_bit(IWL_MVM_STATUS_IN_D0I3, &mvm->status)) {
1497 		spin_unlock_bh(&mvmsta->lock);
1498 		IWL_ERR(mvm, "Entered D0i3 while starting Tx agg\n");
1499 		return -EIO;
1500 	}
1501 
1502 	spin_lock_bh(&mvm->queue_info_lock);
1503 
1504 	/*
1505 	 * Note the possible cases:
1506 	 *  1. In DQA mode with an enabled TXQ - TXQ needs to become agg'ed
1507 	 *  2. Non-DQA mode: the TXQ hasn't yet been enabled, so find a free
1508 	 *	one and mark it as reserved
1509 	 *  3. In DQA mode, but no traffic yet on this TID: same treatment as in
1510 	 *	non-DQA mode, since the TXQ hasn't yet been allocated
1511 	 */
1512 	txq_id = mvmsta->tid_data[tid].txq_id;
1513 	if (!iwl_mvm_is_dqa_supported(mvm) ||
1514 	    mvm->queue_info[txq_id].status != IWL_MVM_QUEUE_READY) {
1515 		txq_id = iwl_mvm_find_free_queue(mvm, mvm->first_agg_queue,
1516 						 mvm->last_agg_queue);
1517 		if (txq_id < 0) {
1518 			ret = txq_id;
1519 			spin_unlock_bh(&mvm->queue_info_lock);
1520 			IWL_ERR(mvm, "Failed to allocate agg queue\n");
1521 			goto release_locks;
1522 		}
1523 
1524 		/* TXQ hasn't yet been enabled, so mark it only as reserved */
1525 		mvm->queue_info[txq_id].status = IWL_MVM_QUEUE_RESERVED;
1526 	}
1527 	spin_unlock_bh(&mvm->queue_info_lock);
1528 
1529 	IWL_DEBUG_TX_QUEUES(mvm,
1530 			    "AGG for tid %d will be on queue #%d\n",
1531 			    tid, txq_id);
1532 
1533 	tid_data = &mvmsta->tid_data[tid];
1534 	tid_data->ssn = IEEE80211_SEQ_TO_SN(tid_data->seq_number);
1535 	tid_data->txq_id = txq_id;
1536 	*ssn = tid_data->ssn;
1537 
1538 	IWL_DEBUG_TX_QUEUES(mvm,
1539 			    "Start AGG: sta %d tid %d queue %d - ssn = %d, next_recl = %d\n",
1540 			    mvmsta->sta_id, tid, txq_id, tid_data->ssn,
1541 			    tid_data->next_reclaimed);
1542 
1543 	if (tid_data->ssn == tid_data->next_reclaimed) {
1544 		tid_data->state = IWL_AGG_STARTING;
1545 		ieee80211_start_tx_ba_cb_irqsafe(vif, sta->addr, tid);
1546 	} else {
1547 		tid_data->state = IWL_EMPTYING_HW_QUEUE_ADDBA;
1548 	}
1549 
1550 	ret = 0;
1551 
1552 release_locks:
1553 	spin_unlock_bh(&mvmsta->lock);
1554 
1555 	return ret;
1556 }
1557 
1558 int iwl_mvm_sta_tx_agg_oper(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1559 			    struct ieee80211_sta *sta, u16 tid, u8 buf_size,
1560 			    bool amsdu)
1561 {
1562 	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1563 	struct iwl_mvm_tid_data *tid_data = &mvmsta->tid_data[tid];
1564 	unsigned int wdg_timeout =
1565 		iwl_mvm_get_wd_timeout(mvm, vif, sta->tdls, false);
1566 	int queue, ret;
1567 	bool alloc_queue = true;
1568 	u16 ssn;
1569 
1570 	struct iwl_trans_txq_scd_cfg cfg = {
1571 		.sta_id = mvmsta->sta_id,
1572 		.tid = tid,
1573 		.frame_limit = buf_size,
1574 		.aggregate = true,
1575 	};
1576 
1577 	BUILD_BUG_ON((sizeof(mvmsta->agg_tids) * BITS_PER_BYTE)
1578 		     != IWL_MAX_TID_COUNT);
1579 
1580 	buf_size = min_t(int, buf_size, LINK_QUAL_AGG_FRAME_LIMIT_DEF);
1581 
1582 	spin_lock_bh(&mvmsta->lock);
1583 	ssn = tid_data->ssn;
1584 	queue = tid_data->txq_id;
1585 	tid_data->state = IWL_AGG_ON;
1586 	mvmsta->agg_tids |= BIT(tid);
1587 	tid_data->ssn = 0xffff;
1588 	tid_data->amsdu_in_ampdu_allowed = amsdu;
1589 	spin_unlock_bh(&mvmsta->lock);
1590 
1591 	cfg.fifo = iwl_mvm_ac_to_tx_fifo[tid_to_mac80211_ac[tid]];
1592 
1593 	/* In DQA mode, the existing queue might need to be reconfigured */
1594 	if (iwl_mvm_is_dqa_supported(mvm)) {
1595 		spin_lock_bh(&mvm->queue_info_lock);
1596 		/* Maybe there is no need to even alloc a queue... */
1597 		if (mvm->queue_info[queue].status == IWL_MVM_QUEUE_READY)
1598 			alloc_queue = false;
1599 		spin_unlock_bh(&mvm->queue_info_lock);
1600 
1601 		/*
1602 		 * Only reconfig the SCD for the queue if the window size has
1603 		 * changed from current (become smaller)
1604 		 */
1605 		if (!alloc_queue && buf_size < mvmsta->max_agg_bufsize) {
1606 			/*
1607 			 * If reconfiguring an existing queue, it first must be
1608 			 * drained
1609 			 */
1610 			ret = iwl_trans_wait_tx_queue_empty(mvm->trans,
1611 							    BIT(queue));
1612 			if (ret) {
1613 				IWL_ERR(mvm,
1614 					"Error draining queue before reconfig\n");
1615 				return ret;
1616 			}
1617 
1618 			ret = iwl_mvm_reconfig_scd(mvm, queue, cfg.fifo,
1619 						   mvmsta->sta_id, tid,
1620 						   buf_size, ssn);
1621 			if (ret) {
1622 				IWL_ERR(mvm,
1623 					"Error reconfiguring TXQ #%d\n", queue);
1624 				return ret;
1625 			}
1626 		}
1627 	}
1628 
1629 	if (alloc_queue)
1630 		iwl_mvm_enable_txq(mvm, queue,
1631 				   vif->hw_queue[tid_to_mac80211_ac[tid]], ssn,
1632 				   &cfg, wdg_timeout);
1633 
1634 	ret = iwl_mvm_sta_tx_agg(mvm, sta, tid, queue, true);
1635 	if (ret)
1636 		return -EIO;
1637 
1638 	/* No need to mark as reserved */
1639 	spin_lock_bh(&mvm->queue_info_lock);
1640 	mvm->queue_info[queue].status = IWL_MVM_QUEUE_READY;
1641 	spin_unlock_bh(&mvm->queue_info_lock);
1642 
1643 	/*
1644 	 * Even though in theory the peer could have different
1645 	 * aggregation reorder buffer sizes for different sessions,
1646 	 * our ucode doesn't allow for that and has a global limit
1647 	 * for each station. Therefore, use the minimum of all the
1648 	 * aggregation sessions and our default value.
1649 	 */
1650 	mvmsta->max_agg_bufsize =
1651 		min(mvmsta->max_agg_bufsize, buf_size);
1652 	mvmsta->lq_sta.lq.agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
1653 
1654 	IWL_DEBUG_HT(mvm, "Tx aggregation enabled on ra = %pM tid = %d\n",
1655 		     sta->addr, tid);
1656 
1657 	return iwl_mvm_send_lq_cmd(mvm, &mvmsta->lq_sta.lq, false);
1658 }
1659 
1660 int iwl_mvm_sta_tx_agg_stop(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1661 			    struct ieee80211_sta *sta, u16 tid)
1662 {
1663 	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1664 	struct iwl_mvm_tid_data *tid_data = &mvmsta->tid_data[tid];
1665 	u16 txq_id;
1666 	int err;
1667 
1668 
1669 	/*
1670 	 * If mac80211 is cleaning its state, then say that we finished since
1671 	 * our state has been cleared anyway.
1672 	 */
1673 	if (test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status)) {
1674 		ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid);
1675 		return 0;
1676 	}
1677 
1678 	spin_lock_bh(&mvmsta->lock);
1679 
1680 	txq_id = tid_data->txq_id;
1681 
1682 	IWL_DEBUG_TX_QUEUES(mvm, "Stop AGG: sta %d tid %d q %d state %d\n",
1683 			    mvmsta->sta_id, tid, txq_id, tid_data->state);
1684 
1685 	mvmsta->agg_tids &= ~BIT(tid);
1686 
1687 	spin_lock_bh(&mvm->queue_info_lock);
1688 	/*
1689 	 * The TXQ is marked as reserved only if no traffic came through yet
1690 	 * This means no traffic has been sent on this TID (agg'd or not), so
1691 	 * we no longer have use for the queue. Since it hasn't even been
1692 	 * allocated through iwl_mvm_enable_txq, so we can just mark it back as
1693 	 * free.
1694 	 */
1695 	if (mvm->queue_info[txq_id].status == IWL_MVM_QUEUE_RESERVED)
1696 		mvm->queue_info[txq_id].status = IWL_MVM_QUEUE_FREE;
1697 	spin_unlock_bh(&mvm->queue_info_lock);
1698 
1699 	switch (tid_data->state) {
1700 	case IWL_AGG_ON:
1701 		tid_data->ssn = IEEE80211_SEQ_TO_SN(tid_data->seq_number);
1702 
1703 		IWL_DEBUG_TX_QUEUES(mvm,
1704 				    "ssn = %d, next_recl = %d\n",
1705 				    tid_data->ssn, tid_data->next_reclaimed);
1706 
1707 		/* There are still packets for this RA / TID in the HW */
1708 		if (tid_data->ssn != tid_data->next_reclaimed) {
1709 			tid_data->state = IWL_EMPTYING_HW_QUEUE_DELBA;
1710 			err = 0;
1711 			break;
1712 		}
1713 
1714 		tid_data->ssn = 0xffff;
1715 		tid_data->state = IWL_AGG_OFF;
1716 		spin_unlock_bh(&mvmsta->lock);
1717 
1718 		ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid);
1719 
1720 		iwl_mvm_sta_tx_agg(mvm, sta, tid, txq_id, false);
1721 
1722 		if (!iwl_mvm_is_dqa_supported(mvm)) {
1723 			int mac_queue = vif->hw_queue[tid_to_mac80211_ac[tid]];
1724 
1725 			iwl_mvm_disable_txq(mvm, txq_id, mac_queue, tid, 0);
1726 		}
1727 		return 0;
1728 	case IWL_AGG_STARTING:
1729 	case IWL_EMPTYING_HW_QUEUE_ADDBA:
1730 		/*
1731 		 * The agg session has been stopped before it was set up. This
1732 		 * can happen when the AddBA timer times out for example.
1733 		 */
1734 
1735 		/* No barriers since we are under mutex */
1736 		lockdep_assert_held(&mvm->mutex);
1737 
1738 		ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid);
1739 		tid_data->state = IWL_AGG_OFF;
1740 		err = 0;
1741 		break;
1742 	default:
1743 		IWL_ERR(mvm,
1744 			"Stopping AGG while state not ON or starting for %d on %d (%d)\n",
1745 			mvmsta->sta_id, tid, tid_data->state);
1746 		IWL_ERR(mvm,
1747 			"\ttid_data->txq_id = %d\n", tid_data->txq_id);
1748 		err = -EINVAL;
1749 	}
1750 
1751 	spin_unlock_bh(&mvmsta->lock);
1752 
1753 	return err;
1754 }
1755 
1756 int iwl_mvm_sta_tx_agg_flush(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1757 			    struct ieee80211_sta *sta, u16 tid)
1758 {
1759 	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1760 	struct iwl_mvm_tid_data *tid_data = &mvmsta->tid_data[tid];
1761 	u16 txq_id;
1762 	enum iwl_mvm_agg_state old_state;
1763 
1764 	/*
1765 	 * First set the agg state to OFF to avoid calling
1766 	 * ieee80211_stop_tx_ba_cb in iwl_mvm_check_ratid_empty.
1767 	 */
1768 	spin_lock_bh(&mvmsta->lock);
1769 	txq_id = tid_data->txq_id;
1770 	IWL_DEBUG_TX_QUEUES(mvm, "Flush AGG: sta %d tid %d q %d state %d\n",
1771 			    mvmsta->sta_id, tid, txq_id, tid_data->state);
1772 	old_state = tid_data->state;
1773 	tid_data->state = IWL_AGG_OFF;
1774 	mvmsta->agg_tids &= ~BIT(tid);
1775 	spin_unlock_bh(&mvmsta->lock);
1776 
1777 	spin_lock_bh(&mvm->queue_info_lock);
1778 	/*
1779 	 * The TXQ is marked as reserved only if no traffic came through yet
1780 	 * This means no traffic has been sent on this TID (agg'd or not), so
1781 	 * we no longer have use for the queue. Since it hasn't even been
1782 	 * allocated through iwl_mvm_enable_txq, so we can just mark it back as
1783 	 * free.
1784 	 */
1785 	if (mvm->queue_info[txq_id].status == IWL_MVM_QUEUE_RESERVED)
1786 		mvm->queue_info[txq_id].status = IWL_MVM_QUEUE_FREE;
1787 	spin_unlock_bh(&mvm->queue_info_lock);
1788 
1789 	if (old_state >= IWL_AGG_ON) {
1790 		iwl_mvm_drain_sta(mvm, mvmsta, true);
1791 		if (iwl_mvm_flush_tx_path(mvm, BIT(txq_id), 0))
1792 			IWL_ERR(mvm, "Couldn't flush the AGG queue\n");
1793 		iwl_trans_wait_tx_queue_empty(mvm->trans,
1794 					      mvmsta->tfd_queue_msk);
1795 		iwl_mvm_drain_sta(mvm, mvmsta, false);
1796 
1797 		iwl_mvm_sta_tx_agg(mvm, sta, tid, txq_id, false);
1798 
1799 		if (!iwl_mvm_is_dqa_supported(mvm)) {
1800 			int mac_queue = vif->hw_queue[tid_to_mac80211_ac[tid]];
1801 
1802 			iwl_mvm_disable_txq(mvm, tid_data->txq_id, mac_queue,
1803 					    tid, 0);
1804 		}
1805 	}
1806 
1807 	return 0;
1808 }
1809 
1810 static int iwl_mvm_set_fw_key_idx(struct iwl_mvm *mvm)
1811 {
1812 	int i, max = -1, max_offs = -1;
1813 
1814 	lockdep_assert_held(&mvm->mutex);
1815 
1816 	/* Pick the unused key offset with the highest 'deleted'
1817 	 * counter. Every time a key is deleted, all the counters
1818 	 * are incremented and the one that was just deleted is
1819 	 * reset to zero. Thus, the highest counter is the one
1820 	 * that was deleted longest ago. Pick that one.
1821 	 */
1822 	for (i = 0; i < STA_KEY_MAX_NUM; i++) {
1823 		if (test_bit(i, mvm->fw_key_table))
1824 			continue;
1825 		if (mvm->fw_key_deleted[i] > max) {
1826 			max = mvm->fw_key_deleted[i];
1827 			max_offs = i;
1828 		}
1829 	}
1830 
1831 	if (max_offs < 0)
1832 		return STA_KEY_IDX_INVALID;
1833 
1834 	return max_offs;
1835 }
1836 
1837 static struct iwl_mvm_sta *iwl_mvm_get_key_sta(struct iwl_mvm *mvm,
1838 					       struct ieee80211_vif *vif,
1839 					       struct ieee80211_sta *sta)
1840 {
1841 	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
1842 
1843 	if (sta)
1844 		return iwl_mvm_sta_from_mac80211(sta);
1845 
1846 	/*
1847 	 * The device expects GTKs for station interfaces to be
1848 	 * installed as GTKs for the AP station. If we have no
1849 	 * station ID, then use AP's station ID.
1850 	 */
1851 	if (vif->type == NL80211_IFTYPE_STATION &&
1852 	    mvmvif->ap_sta_id != IWL_MVM_STATION_COUNT) {
1853 		u8 sta_id = mvmvif->ap_sta_id;
1854 
1855 		sta = rcu_dereference_check(mvm->fw_id_to_mac_id[sta_id],
1856 					    lockdep_is_held(&mvm->mutex));
1857 
1858 		/*
1859 		 * It is possible that the 'sta' parameter is NULL,
1860 		 * for example when a GTK is removed - the sta_id will then
1861 		 * be the AP ID, and no station was passed by mac80211.
1862 		 */
1863 		if (IS_ERR_OR_NULL(sta))
1864 			return NULL;
1865 
1866 		return iwl_mvm_sta_from_mac80211(sta);
1867 	}
1868 
1869 	return NULL;
1870 }
1871 
1872 static int iwl_mvm_send_sta_key(struct iwl_mvm *mvm,
1873 				struct iwl_mvm_sta *mvm_sta,
1874 				struct ieee80211_key_conf *keyconf, bool mcast,
1875 				u32 tkip_iv32, u16 *tkip_p1k, u32 cmd_flags,
1876 				u8 key_offset)
1877 {
1878 	struct iwl_mvm_add_sta_key_cmd cmd = {};
1879 	__le16 key_flags;
1880 	int ret;
1881 	u32 status;
1882 	u16 keyidx;
1883 	int i;
1884 	u8 sta_id = mvm_sta->sta_id;
1885 
1886 	keyidx = (keyconf->keyidx << STA_KEY_FLG_KEYID_POS) &
1887 		 STA_KEY_FLG_KEYID_MSK;
1888 	key_flags = cpu_to_le16(keyidx);
1889 	key_flags |= cpu_to_le16(STA_KEY_FLG_WEP_KEY_MAP);
1890 
1891 	switch (keyconf->cipher) {
1892 	case WLAN_CIPHER_SUITE_TKIP:
1893 		key_flags |= cpu_to_le16(STA_KEY_FLG_TKIP);
1894 		cmd.tkip_rx_tsc_byte2 = tkip_iv32;
1895 		for (i = 0; i < 5; i++)
1896 			cmd.tkip_rx_ttak[i] = cpu_to_le16(tkip_p1k[i]);
1897 		memcpy(cmd.key, keyconf->key, keyconf->keylen);
1898 		break;
1899 	case WLAN_CIPHER_SUITE_CCMP:
1900 		key_flags |= cpu_to_le16(STA_KEY_FLG_CCM);
1901 		memcpy(cmd.key, keyconf->key, keyconf->keylen);
1902 		break;
1903 	case WLAN_CIPHER_SUITE_WEP104:
1904 		key_flags |= cpu_to_le16(STA_KEY_FLG_WEP_13BYTES);
1905 		/* fall through */
1906 	case WLAN_CIPHER_SUITE_WEP40:
1907 		key_flags |= cpu_to_le16(STA_KEY_FLG_WEP);
1908 		memcpy(cmd.key + 3, keyconf->key, keyconf->keylen);
1909 		break;
1910 	default:
1911 		key_flags |= cpu_to_le16(STA_KEY_FLG_EXT);
1912 		memcpy(cmd.key, keyconf->key, keyconf->keylen);
1913 	}
1914 
1915 	if (mcast)
1916 		key_flags |= cpu_to_le16(STA_KEY_MULTICAST);
1917 
1918 	cmd.key_offset = key_offset;
1919 	cmd.key_flags = key_flags;
1920 	cmd.sta_id = sta_id;
1921 
1922 	status = ADD_STA_SUCCESS;
1923 	if (cmd_flags & CMD_ASYNC)
1924 		ret =  iwl_mvm_send_cmd_pdu(mvm, ADD_STA_KEY, CMD_ASYNC,
1925 					    sizeof(cmd), &cmd);
1926 	else
1927 		ret = iwl_mvm_send_cmd_pdu_status(mvm, ADD_STA_KEY, sizeof(cmd),
1928 						  &cmd, &status);
1929 
1930 	switch (status) {
1931 	case ADD_STA_SUCCESS:
1932 		IWL_DEBUG_WEP(mvm, "MODIFY_STA: set dynamic key passed\n");
1933 		break;
1934 	default:
1935 		ret = -EIO;
1936 		IWL_ERR(mvm, "MODIFY_STA: set dynamic key failed\n");
1937 		break;
1938 	}
1939 
1940 	return ret;
1941 }
1942 
1943 static int iwl_mvm_send_sta_igtk(struct iwl_mvm *mvm,
1944 				 struct ieee80211_key_conf *keyconf,
1945 				 u8 sta_id, bool remove_key)
1946 {
1947 	struct iwl_mvm_mgmt_mcast_key_cmd igtk_cmd = {};
1948 
1949 	/* verify the key details match the required command's expectations */
1950 	if (WARN_ON((keyconf->cipher != WLAN_CIPHER_SUITE_AES_CMAC) ||
1951 		    (keyconf->flags & IEEE80211_KEY_FLAG_PAIRWISE) ||
1952 		    (keyconf->keyidx != 4 && keyconf->keyidx != 5)))
1953 		return -EINVAL;
1954 
1955 	igtk_cmd.key_id = cpu_to_le32(keyconf->keyidx);
1956 	igtk_cmd.sta_id = cpu_to_le32(sta_id);
1957 
1958 	if (remove_key) {
1959 		igtk_cmd.ctrl_flags |= cpu_to_le32(STA_KEY_NOT_VALID);
1960 	} else {
1961 		struct ieee80211_key_seq seq;
1962 		const u8 *pn;
1963 
1964 		switch (keyconf->cipher) {
1965 		case WLAN_CIPHER_SUITE_AES_CMAC:
1966 			igtk_cmd.ctrl_flags |= cpu_to_le32(STA_KEY_FLG_CCM);
1967 			break;
1968 		default:
1969 			return -EINVAL;
1970 		}
1971 
1972 		memcpy(igtk_cmd.IGTK, keyconf->key, keyconf->keylen);
1973 		ieee80211_get_key_rx_seq(keyconf, 0, &seq);
1974 		pn = seq.aes_cmac.pn;
1975 		igtk_cmd.receive_seq_cnt = cpu_to_le64(((u64) pn[5] << 0) |
1976 						       ((u64) pn[4] << 8) |
1977 						       ((u64) pn[3] << 16) |
1978 						       ((u64) pn[2] << 24) |
1979 						       ((u64) pn[1] << 32) |
1980 						       ((u64) pn[0] << 40));
1981 	}
1982 
1983 	IWL_DEBUG_INFO(mvm, "%s igtk for sta %u\n",
1984 		       remove_key ? "removing" : "installing",
1985 		       igtk_cmd.sta_id);
1986 
1987 	return iwl_mvm_send_cmd_pdu(mvm, MGMT_MCAST_KEY, 0,
1988 				    sizeof(igtk_cmd), &igtk_cmd);
1989 }
1990 
1991 
1992 static inline u8 *iwl_mvm_get_mac_addr(struct iwl_mvm *mvm,
1993 				       struct ieee80211_vif *vif,
1994 				       struct ieee80211_sta *sta)
1995 {
1996 	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
1997 
1998 	if (sta)
1999 		return sta->addr;
2000 
2001 	if (vif->type == NL80211_IFTYPE_STATION &&
2002 	    mvmvif->ap_sta_id != IWL_MVM_STATION_COUNT) {
2003 		u8 sta_id = mvmvif->ap_sta_id;
2004 		sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[sta_id],
2005 						lockdep_is_held(&mvm->mutex));
2006 		return sta->addr;
2007 	}
2008 
2009 
2010 	return NULL;
2011 }
2012 
2013 static int __iwl_mvm_set_sta_key(struct iwl_mvm *mvm,
2014 				 struct ieee80211_vif *vif,
2015 				 struct ieee80211_sta *sta,
2016 				 struct ieee80211_key_conf *keyconf,
2017 				 u8 key_offset,
2018 				 bool mcast)
2019 {
2020 	struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
2021 	int ret;
2022 	const u8 *addr;
2023 	struct ieee80211_key_seq seq;
2024 	u16 p1k[5];
2025 
2026 	switch (keyconf->cipher) {
2027 	case WLAN_CIPHER_SUITE_TKIP:
2028 		addr = iwl_mvm_get_mac_addr(mvm, vif, sta);
2029 		/* get phase 1 key from mac80211 */
2030 		ieee80211_get_key_rx_seq(keyconf, 0, &seq);
2031 		ieee80211_get_tkip_rx_p1k(keyconf, addr, seq.tkip.iv32, p1k);
2032 		ret = iwl_mvm_send_sta_key(mvm, mvm_sta, keyconf, mcast,
2033 					   seq.tkip.iv32, p1k, 0, key_offset);
2034 		break;
2035 	case WLAN_CIPHER_SUITE_CCMP:
2036 	case WLAN_CIPHER_SUITE_WEP40:
2037 	case WLAN_CIPHER_SUITE_WEP104:
2038 		ret = iwl_mvm_send_sta_key(mvm, mvm_sta, keyconf, mcast,
2039 					   0, NULL, 0, key_offset);
2040 		break;
2041 	default:
2042 		ret = iwl_mvm_send_sta_key(mvm, mvm_sta, keyconf, mcast,
2043 					   0, NULL, 0, key_offset);
2044 	}
2045 
2046 	return ret;
2047 }
2048 
2049 static int __iwl_mvm_remove_sta_key(struct iwl_mvm *mvm, u8 sta_id,
2050 				    struct ieee80211_key_conf *keyconf,
2051 				    bool mcast)
2052 {
2053 	struct iwl_mvm_add_sta_key_cmd cmd = {};
2054 	__le16 key_flags;
2055 	int ret;
2056 	u32 status;
2057 
2058 	key_flags = cpu_to_le16((keyconf->keyidx << STA_KEY_FLG_KEYID_POS) &
2059 				 STA_KEY_FLG_KEYID_MSK);
2060 	key_flags |= cpu_to_le16(STA_KEY_FLG_NO_ENC | STA_KEY_FLG_WEP_KEY_MAP);
2061 	key_flags |= cpu_to_le16(STA_KEY_NOT_VALID);
2062 
2063 	if (mcast)
2064 		key_flags |= cpu_to_le16(STA_KEY_MULTICAST);
2065 
2066 	cmd.key_flags = key_flags;
2067 	cmd.key_offset = keyconf->hw_key_idx;
2068 	cmd.sta_id = sta_id;
2069 
2070 	status = ADD_STA_SUCCESS;
2071 	ret = iwl_mvm_send_cmd_pdu_status(mvm, ADD_STA_KEY, sizeof(cmd),
2072 					  &cmd, &status);
2073 
2074 	switch (status) {
2075 	case ADD_STA_SUCCESS:
2076 		IWL_DEBUG_WEP(mvm, "MODIFY_STA: remove sta key passed\n");
2077 		break;
2078 	default:
2079 		ret = -EIO;
2080 		IWL_ERR(mvm, "MODIFY_STA: remove sta key failed\n");
2081 		break;
2082 	}
2083 
2084 	return ret;
2085 }
2086 
2087 int iwl_mvm_set_sta_key(struct iwl_mvm *mvm,
2088 			struct ieee80211_vif *vif,
2089 			struct ieee80211_sta *sta,
2090 			struct ieee80211_key_conf *keyconf,
2091 			u8 key_offset)
2092 {
2093 	bool mcast = !(keyconf->flags & IEEE80211_KEY_FLAG_PAIRWISE);
2094 	struct iwl_mvm_sta *mvm_sta;
2095 	u8 sta_id;
2096 	int ret;
2097 	static const u8 __maybe_unused zero_addr[ETH_ALEN] = {0};
2098 
2099 	lockdep_assert_held(&mvm->mutex);
2100 
2101 	/* Get the station id from the mvm local station table */
2102 	mvm_sta = iwl_mvm_get_key_sta(mvm, vif, sta);
2103 	if (!mvm_sta) {
2104 		IWL_ERR(mvm, "Failed to find station\n");
2105 		return -EINVAL;
2106 	}
2107 	sta_id = mvm_sta->sta_id;
2108 
2109 	if (keyconf->cipher == WLAN_CIPHER_SUITE_AES_CMAC) {
2110 		ret = iwl_mvm_send_sta_igtk(mvm, keyconf, sta_id, false);
2111 		goto end;
2112 	}
2113 
2114 	/*
2115 	 * It is possible that the 'sta' parameter is NULL, and thus
2116 	 * there is a need to retrieve  the sta from the local station table.
2117 	 */
2118 	if (!sta) {
2119 		sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[sta_id],
2120 						lockdep_is_held(&mvm->mutex));
2121 		if (IS_ERR_OR_NULL(sta)) {
2122 			IWL_ERR(mvm, "Invalid station id\n");
2123 			return -EINVAL;
2124 		}
2125 	}
2126 
2127 	if (WARN_ON_ONCE(iwl_mvm_sta_from_mac80211(sta)->vif != vif))
2128 		return -EINVAL;
2129 
2130 	/* If the key_offset is not pre-assigned, we need to find a
2131 	 * new offset to use.  In normal cases, the offset is not
2132 	 * pre-assigned, but during HW_RESTART we want to reuse the
2133 	 * same indices, so we pass them when this function is called.
2134 	 *
2135 	 * In D3 entry, we need to hardcoded the indices (because the
2136 	 * firmware hardcodes the PTK offset to 0).  In this case, we
2137 	 * need to make sure we don't overwrite the hw_key_idx in the
2138 	 * keyconf structure, because otherwise we cannot configure
2139 	 * the original ones back when resuming.
2140 	 */
2141 	if (key_offset == STA_KEY_IDX_INVALID) {
2142 		key_offset  = iwl_mvm_set_fw_key_idx(mvm);
2143 		if (key_offset == STA_KEY_IDX_INVALID)
2144 			return -ENOSPC;
2145 		keyconf->hw_key_idx = key_offset;
2146 	}
2147 
2148 	ret = __iwl_mvm_set_sta_key(mvm, vif, sta, keyconf, key_offset, mcast);
2149 	if (ret)
2150 		goto end;
2151 
2152 	/*
2153 	 * For WEP, the same key is used for multicast and unicast. Upload it
2154 	 * again, using the same key offset, and now pointing the other one
2155 	 * to the same key slot (offset).
2156 	 * If this fails, remove the original as well.
2157 	 */
2158 	if (keyconf->cipher == WLAN_CIPHER_SUITE_WEP40 ||
2159 	    keyconf->cipher == WLAN_CIPHER_SUITE_WEP104) {
2160 		ret = __iwl_mvm_set_sta_key(mvm, vif, sta, keyconf,
2161 					    key_offset, !mcast);
2162 		if (ret) {
2163 			__iwl_mvm_remove_sta_key(mvm, sta_id, keyconf, mcast);
2164 			goto end;
2165 		}
2166 	}
2167 
2168 	__set_bit(key_offset, mvm->fw_key_table);
2169 
2170 end:
2171 	IWL_DEBUG_WEP(mvm, "key: cipher=%x len=%d idx=%d sta=%pM ret=%d\n",
2172 		      keyconf->cipher, keyconf->keylen, keyconf->keyidx,
2173 		      sta ? sta->addr : zero_addr, ret);
2174 	return ret;
2175 }
2176 
2177 int iwl_mvm_remove_sta_key(struct iwl_mvm *mvm,
2178 			   struct ieee80211_vif *vif,
2179 			   struct ieee80211_sta *sta,
2180 			   struct ieee80211_key_conf *keyconf)
2181 {
2182 	bool mcast = !(keyconf->flags & IEEE80211_KEY_FLAG_PAIRWISE);
2183 	struct iwl_mvm_sta *mvm_sta;
2184 	u8 sta_id = IWL_MVM_STATION_COUNT;
2185 	int ret, i;
2186 
2187 	lockdep_assert_held(&mvm->mutex);
2188 
2189 	/* Get the station from the mvm local station table */
2190 	mvm_sta = iwl_mvm_get_key_sta(mvm, vif, sta);
2191 
2192 	IWL_DEBUG_WEP(mvm, "mvm remove dynamic key: idx=%d sta=%d\n",
2193 		      keyconf->keyidx, sta_id);
2194 
2195 	if (keyconf->cipher == WLAN_CIPHER_SUITE_AES_CMAC)
2196 		return iwl_mvm_send_sta_igtk(mvm, keyconf, sta_id, true);
2197 
2198 	if (!__test_and_clear_bit(keyconf->hw_key_idx, mvm->fw_key_table)) {
2199 		IWL_ERR(mvm, "offset %d not used in fw key table.\n",
2200 			keyconf->hw_key_idx);
2201 		return -ENOENT;
2202 	}
2203 
2204 	/* track which key was deleted last */
2205 	for (i = 0; i < STA_KEY_MAX_NUM; i++) {
2206 		if (mvm->fw_key_deleted[i] < U8_MAX)
2207 			mvm->fw_key_deleted[i]++;
2208 	}
2209 	mvm->fw_key_deleted[keyconf->hw_key_idx] = 0;
2210 
2211 	if (!mvm_sta) {
2212 		IWL_DEBUG_WEP(mvm, "station non-existent, early return.\n");
2213 		return 0;
2214 	}
2215 
2216 	sta_id = mvm_sta->sta_id;
2217 
2218 	ret = __iwl_mvm_remove_sta_key(mvm, sta_id, keyconf, mcast);
2219 	if (ret)
2220 		return ret;
2221 
2222 	/* delete WEP key twice to get rid of (now useless) offset */
2223 	if (keyconf->cipher == WLAN_CIPHER_SUITE_WEP40 ||
2224 	    keyconf->cipher == WLAN_CIPHER_SUITE_WEP104)
2225 		ret = __iwl_mvm_remove_sta_key(mvm, sta_id, keyconf, !mcast);
2226 
2227 	return ret;
2228 }
2229 
2230 void iwl_mvm_update_tkip_key(struct iwl_mvm *mvm,
2231 			     struct ieee80211_vif *vif,
2232 			     struct ieee80211_key_conf *keyconf,
2233 			     struct ieee80211_sta *sta, u32 iv32,
2234 			     u16 *phase1key)
2235 {
2236 	struct iwl_mvm_sta *mvm_sta;
2237 	bool mcast = !(keyconf->flags & IEEE80211_KEY_FLAG_PAIRWISE);
2238 
2239 	rcu_read_lock();
2240 
2241 	mvm_sta = iwl_mvm_get_key_sta(mvm, vif, sta);
2242 	if (WARN_ON_ONCE(!mvm_sta))
2243 		goto unlock;
2244 	iwl_mvm_send_sta_key(mvm, mvm_sta, keyconf, mcast,
2245 			     iv32, phase1key, CMD_ASYNC, keyconf->hw_key_idx);
2246 
2247  unlock:
2248 	rcu_read_unlock();
2249 }
2250 
2251 void iwl_mvm_sta_modify_ps_wake(struct iwl_mvm *mvm,
2252 				struct ieee80211_sta *sta)
2253 {
2254 	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2255 	struct iwl_mvm_add_sta_cmd cmd = {
2256 		.add_modify = STA_MODE_MODIFY,
2257 		.sta_id = mvmsta->sta_id,
2258 		.station_flags_msk = cpu_to_le32(STA_FLG_PS),
2259 		.mac_id_n_color = cpu_to_le32(mvmsta->mac_id_n_color),
2260 	};
2261 	int ret;
2262 
2263 	ret = iwl_mvm_send_cmd_pdu(mvm, ADD_STA, CMD_ASYNC,
2264 				   iwl_mvm_add_sta_cmd_size(mvm), &cmd);
2265 	if (ret)
2266 		IWL_ERR(mvm, "Failed to send ADD_STA command (%d)\n", ret);
2267 }
2268 
2269 void iwl_mvm_sta_modify_sleep_tx_count(struct iwl_mvm *mvm,
2270 				       struct ieee80211_sta *sta,
2271 				       enum ieee80211_frame_release_type reason,
2272 				       u16 cnt, u16 tids, bool more_data,
2273 				       bool agg)
2274 {
2275 	struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2276 	struct iwl_mvm_add_sta_cmd cmd = {
2277 		.add_modify = STA_MODE_MODIFY,
2278 		.sta_id = mvmsta->sta_id,
2279 		.modify_mask = STA_MODIFY_SLEEPING_STA_TX_COUNT,
2280 		.sleep_tx_count = cpu_to_le16(cnt),
2281 		.mac_id_n_color = cpu_to_le32(mvmsta->mac_id_n_color),
2282 	};
2283 	int tid, ret;
2284 	unsigned long _tids = tids;
2285 
2286 	/* convert TIDs to ACs - we don't support TSPEC so that's OK
2287 	 * Note that this field is reserved and unused by firmware not
2288 	 * supporting GO uAPSD, so it's safe to always do this.
2289 	 */
2290 	for_each_set_bit(tid, &_tids, IWL_MAX_TID_COUNT)
2291 		cmd.awake_acs |= BIT(tid_to_ucode_ac[tid]);
2292 
2293 	/* If we're releasing frames from aggregation queues then check if the
2294 	 * all queues combined that we're releasing frames from have
2295 	 *  - more frames than the service period, in which case more_data
2296 	 *    needs to be set
2297 	 *  - fewer than 'cnt' frames, in which case we need to adjust the
2298 	 *    firmware command (but do that unconditionally)
2299 	 */
2300 	if (agg) {
2301 		int remaining = cnt;
2302 		int sleep_tx_count;
2303 
2304 		spin_lock_bh(&mvmsta->lock);
2305 		for_each_set_bit(tid, &_tids, IWL_MAX_TID_COUNT) {
2306 			struct iwl_mvm_tid_data *tid_data;
2307 			u16 n_queued;
2308 
2309 			tid_data = &mvmsta->tid_data[tid];
2310 			if (WARN(tid_data->state != IWL_AGG_ON &&
2311 				 tid_data->state != IWL_EMPTYING_HW_QUEUE_DELBA,
2312 				 "TID %d state is %d\n",
2313 				 tid, tid_data->state)) {
2314 				spin_unlock_bh(&mvmsta->lock);
2315 				ieee80211_sta_eosp(sta);
2316 				return;
2317 			}
2318 
2319 			n_queued = iwl_mvm_tid_queued(tid_data);
2320 			if (n_queued > remaining) {
2321 				more_data = true;
2322 				remaining = 0;
2323 				break;
2324 			}
2325 			remaining -= n_queued;
2326 		}
2327 		sleep_tx_count = cnt - remaining;
2328 		if (reason == IEEE80211_FRAME_RELEASE_UAPSD)
2329 			mvmsta->sleep_tx_count = sleep_tx_count;
2330 		spin_unlock_bh(&mvmsta->lock);
2331 
2332 		cmd.sleep_tx_count = cpu_to_le16(sleep_tx_count);
2333 		if (WARN_ON(cnt - remaining == 0)) {
2334 			ieee80211_sta_eosp(sta);
2335 			return;
2336 		}
2337 	}
2338 
2339 	/* Note: this is ignored by firmware not supporting GO uAPSD */
2340 	if (more_data)
2341 		cmd.sleep_state_flags |= cpu_to_le16(STA_SLEEP_STATE_MOREDATA);
2342 
2343 	if (reason == IEEE80211_FRAME_RELEASE_PSPOLL) {
2344 		mvmsta->next_status_eosp = true;
2345 		cmd.sleep_state_flags |= cpu_to_le16(STA_SLEEP_STATE_PS_POLL);
2346 	} else {
2347 		cmd.sleep_state_flags |= cpu_to_le16(STA_SLEEP_STATE_UAPSD);
2348 	}
2349 
2350 	/* block the Tx queues until the FW updated the sleep Tx count */
2351 	iwl_trans_block_txq_ptrs(mvm->trans, true);
2352 
2353 	ret = iwl_mvm_send_cmd_pdu(mvm, ADD_STA,
2354 				   CMD_ASYNC | CMD_WANT_ASYNC_CALLBACK,
2355 				   iwl_mvm_add_sta_cmd_size(mvm), &cmd);
2356 	if (ret)
2357 		IWL_ERR(mvm, "Failed to send ADD_STA command (%d)\n", ret);
2358 }
2359 
2360 void iwl_mvm_rx_eosp_notif(struct iwl_mvm *mvm,
2361 			   struct iwl_rx_cmd_buffer *rxb)
2362 {
2363 	struct iwl_rx_packet *pkt = rxb_addr(rxb);
2364 	struct iwl_mvm_eosp_notification *notif = (void *)pkt->data;
2365 	struct ieee80211_sta *sta;
2366 	u32 sta_id = le32_to_cpu(notif->sta_id);
2367 
2368 	if (WARN_ON_ONCE(sta_id >= IWL_MVM_STATION_COUNT))
2369 		return;
2370 
2371 	rcu_read_lock();
2372 	sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);
2373 	if (!IS_ERR_OR_NULL(sta))
2374 		ieee80211_sta_eosp(sta);
2375 	rcu_read_unlock();
2376 }
2377 
2378 void iwl_mvm_sta_modify_disable_tx(struct iwl_mvm *mvm,
2379 				   struct iwl_mvm_sta *mvmsta, bool disable)
2380 {
2381 	struct iwl_mvm_add_sta_cmd cmd = {
2382 		.add_modify = STA_MODE_MODIFY,
2383 		.sta_id = mvmsta->sta_id,
2384 		.station_flags = disable ? cpu_to_le32(STA_FLG_DISABLE_TX) : 0,
2385 		.station_flags_msk = cpu_to_le32(STA_FLG_DISABLE_TX),
2386 		.mac_id_n_color = cpu_to_le32(mvmsta->mac_id_n_color),
2387 	};
2388 	int ret;
2389 
2390 	ret = iwl_mvm_send_cmd_pdu(mvm, ADD_STA, CMD_ASYNC,
2391 				   iwl_mvm_add_sta_cmd_size(mvm), &cmd);
2392 	if (ret)
2393 		IWL_ERR(mvm, "Failed to send ADD_STA command (%d)\n", ret);
2394 }
2395 
2396 void iwl_mvm_sta_modify_disable_tx_ap(struct iwl_mvm *mvm,
2397 				      struct ieee80211_sta *sta,
2398 				      bool disable)
2399 {
2400 	struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
2401 
2402 	spin_lock_bh(&mvm_sta->lock);
2403 
2404 	if (mvm_sta->disable_tx == disable) {
2405 		spin_unlock_bh(&mvm_sta->lock);
2406 		return;
2407 	}
2408 
2409 	mvm_sta->disable_tx = disable;
2410 
2411 	/*
2412 	 * Tell mac80211 to start/stop queuing tx for this station,
2413 	 * but don't stop queuing if there are still pending frames
2414 	 * for this station.
2415 	 */
2416 	if (disable || !atomic_read(&mvm->pending_frames[mvm_sta->sta_id]))
2417 		ieee80211_sta_block_awake(mvm->hw, sta, disable);
2418 
2419 	iwl_mvm_sta_modify_disable_tx(mvm, mvm_sta, disable);
2420 
2421 	spin_unlock_bh(&mvm_sta->lock);
2422 }
2423 
2424 void iwl_mvm_modify_all_sta_disable_tx(struct iwl_mvm *mvm,
2425 				       struct iwl_mvm_vif *mvmvif,
2426 				       bool disable)
2427 {
2428 	struct ieee80211_sta *sta;
2429 	struct iwl_mvm_sta *mvm_sta;
2430 	int i;
2431 
2432 	lockdep_assert_held(&mvm->mutex);
2433 
2434 	/* Block/unblock all the stations of the given mvmvif */
2435 	for (i = 0; i < IWL_MVM_STATION_COUNT; i++) {
2436 		sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[i],
2437 						lockdep_is_held(&mvm->mutex));
2438 		if (IS_ERR_OR_NULL(sta))
2439 			continue;
2440 
2441 		mvm_sta = iwl_mvm_sta_from_mac80211(sta);
2442 		if (mvm_sta->mac_id_n_color !=
2443 		    FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color))
2444 			continue;
2445 
2446 		iwl_mvm_sta_modify_disable_tx_ap(mvm, sta, disable);
2447 	}
2448 }
2449 
2450 void iwl_mvm_csa_client_absent(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
2451 {
2452 	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
2453 	struct iwl_mvm_sta *mvmsta;
2454 
2455 	rcu_read_lock();
2456 
2457 	mvmsta = iwl_mvm_sta_from_staid_rcu(mvm, mvmvif->ap_sta_id);
2458 
2459 	if (!WARN_ON(!mvmsta))
2460 		iwl_mvm_sta_modify_disable_tx(mvm, mvmsta, true);
2461 
2462 	rcu_read_unlock();
2463 }
2464