aboutsummaryrefslogtreecommitdiff
path: root/drivers/net/wireless/iwlwifi/mvm/tx.c
blob: f212f16502ff43c3b446d3f99e136fbf5c4b795a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
/******************************************************************************
 *
 * This file is provided under a dual BSD/GPLv2 license.  When using or
 * redistributing this file, you may do so under either license.
 *
 * GPL LICENSE SUMMARY
 *
 * Copyright(c) 2012 - 2013 Intel Corporation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
 * USA
 *
 * The full GNU General Public License is included in this distribution
 * in the file called COPYING.
 *
 * Contact Information:
 *  Intel Linux Wireless <ilw@linux.intel.com>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 * BSD LICENSE
 *
 * Copyright(c) 2012 - 2013 Intel Corporation. All rights reserved.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *  * Neither the name Intel Corporation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *****************************************************************************/
#include <linux/ieee80211.h>
#include <linux/etherdevice.h>

#include "iwl-trans.h"
#include "iwl-eeprom-parse.h"
#include "mvm.h"
#include "sta.h"

/*
 * Sets most of the Tx cmd's fields
 */
static void iwl_mvm_set_tx_cmd(struct iwl_mvm *mvm, struct sk_buff *skb,
			       struct iwl_tx_cmd *tx_cmd,
			       struct ieee80211_tx_info *info, u8 sta_id)
{
	struct ieee80211_hdr *hdr = (void *)skb->data;
	__le16 fc = hdr->frame_control;
	u32 tx_flags = le32_to_cpu(tx_cmd->tx_flags);
	u32 len = skb->len + FCS_LEN;

	if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
		tx_flags |= TX_CMD_FLG_ACK;
	else
		tx_flags &= ~TX_CMD_FLG_ACK;

	if (ieee80211_is_probe_resp(fc))
		tx_flags |= TX_CMD_FLG_TSF;
	else if (ieee80211_is_back_req(fc))
		tx_flags |= TX_CMD_FLG_ACK | TX_CMD_FLG_BAR;

	/* High prio packet (wrt. BT coex) if it is EAPOL, MCAST or MGMT */
	if (info->band == IEEE80211_BAND_2GHZ        &&
	    (skb->protocol == cpu_to_be16(ETH_P_PAE)  ||
	     is_multicast_ether_addr(hdr->addr1)      ||
	     ieee80211_is_back_req(fc)                ||
	     ieee80211_is_mgmt(fc)))
		tx_flags |= TX_CMD_FLG_BT_DIS;

	if (ieee80211_has_morefrags(fc))
		tx_flags |= TX_CMD_FLG_MORE_FRAG;

	if (ieee80211_is_data_qos(fc)) {
		u8 *qc = ieee80211_get_qos_ctl(hdr);
		tx_cmd->tid_tspec = qc[0] & 0xf;
		tx_flags &= ~TX_CMD_FLG_SEQ_CTL;
	} else {
		tx_cmd->tid_tspec = IWL_TID_NON_QOS;
		if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ)
			tx_flags |= TX_CMD_FLG_SEQ_CTL;
		else
			tx_flags &= ~TX_CMD_FLG_SEQ_CTL;
	}

	if (ieee80211_is_mgmt(fc)) {
		if (ieee80211_is_assoc_req(fc) || ieee80211_is_reassoc_req(fc))
			tx_cmd->pm_frame_timeout = cpu_to_le16(3);
		else
			tx_cmd->pm_frame_timeout = cpu_to_le16(2);

		/* The spec allows Action frames in A-MPDU, we don't support
		 * it
		 */
		WARN_ON_ONCE(info->flags & IEEE80211_TX_CTL_AMPDU);
	} else {
		tx_cmd->pm_frame_timeout = 0;
	}

	if (info->flags & IEEE80211_TX_CTL_AMPDU)
		tx_flags |= TX_CMD_FLG_PROT_REQUIRE;

	if (ieee80211_is_data(fc) && len > mvm->rts_threshold &&
	    !is_multicast_ether_addr(ieee80211_get_DA(hdr)))
		tx_flags |= TX_CMD_FLG_PROT_REQUIRE;

	tx_cmd->driver_txop = 0;
	tx_cmd->tx_flags = cpu_to_le32(tx_flags);
	/* Total # bytes to be transmitted */
	tx_cmd->len = cpu_to_le16((u16)skb->len);
	tx_cmd->next_frame_len = 0;
	tx_cmd->life_time = cpu_to_le32(TX_CMD_LIFE_TIME_INFINITE);
	tx_cmd->sta_id = sta_id;
}

/*
 * Sets the fields in the Tx cmd that are rate related
 */
static void iwl_mvm_set_tx_cmd_rate(struct iwl_mvm *mvm,
				    struct iwl_tx_cmd *tx_cmd,
				    struct ieee80211_tx_info *info,
				    struct ieee80211_sta *sta,
				    __le16 fc)
{
	u32 rate_flags;
	int rate_idx;
	u8 rate_plcp;

	/* Set retry limit on RTS packets */
	tx_cmd->rts_retry_limit = IWL_RTS_DFAULT_RETRY_LIMIT;

	/* Set retry limit on DATA packets and Probe Responses*/
	if (ieee80211_is_probe_resp(fc)) {
		tx_cmd->data_retry_limit = IWL_MGMT_DFAULT_RETRY_LIMIT;
		tx_cmd->rts_retry_limit =
			min(tx_cmd->data_retry_limit, tx_cmd->rts_retry_limit);
	} else if (ieee80211_is_back_req(fc)) {
		tx_cmd->data_retry_limit = IWL_BAR_DFAULT_RETRY_LIMIT;
	} else {
		tx_cmd->data_retry_limit = IWL_DEFAULT_TX_RETRY;
	}

	/*
	 * for data packets, rate info comes from the table inside he fw. This
	 * table is controlled by LINK_QUALITY commands
	 */

	if (ieee80211_is_data(fc)) {
		tx_cmd->initial_rate_index = 0;
		tx_cmd->tx_flags |= cpu_to_le32(TX_CMD_FLG_STA_RATE);
		return;
	} else if (ieee80211_is_back_req(fc)) {
		tx_cmd->tx_flags |= cpu_to_le32(TX_CMD_FLG_STA_RATE);
	}

	/* HT rate doesn't make sense for a non data frame */
	WARN_ONCE(info->control.rates[0].flags & IEEE80211_TX_RC_MCS,
		  "Got an HT rate for a non data frame 0x%x\n",
		  info->control.rates[0].flags);

	rate_idx = info->control.rates[0].idx;
	/* if the rate isn't a well known legacy rate, take the lowest one */
	if (rate_idx < 0 || rate_idx > IWL_RATE_COUNT_LEGACY)
		rate_idx = rate_lowest_index(
				&mvm->nvm_data->bands[info->band], sta);

	/* For 5 GHZ band, remap mac80211 rate indices into driver indices */
	if (info->band == IEEE80211_BAND_5GHZ)
		rate_idx += IWL_FIRST_OFDM_RATE;

	/* For 2.4 GHZ band, check that there is no need to remap */
	BUILD_BUG_ON(IWL_FIRST_CCK_RATE != 0);

	/* Get PLCP rate for tx_cmd->rate_n_flags */
	rate_plcp = iwl_mvm_mac80211_idx_to_hwrate(rate_idx);

	mvm->mgmt_last_antenna_idx =
		iwl_mvm_next_antenna(mvm, iwl_fw_valid_tx_ant(mvm->fw),
				     mvm->mgmt_last_antenna_idx);
	rate_flags = BIT(mvm->mgmt_last_antenna_idx) << RATE_MCS_ANT_POS;

	/* Set CCK flag as needed */
	if ((rate_idx >= IWL_FIRST_CCK_RATE) && (rate_idx <= IWL_LAST_CCK_RATE))
		rate_flags |= RATE_MCS_CCK_MSK;

	/* Set the rate in the TX cmd */
	tx_cmd->rate_n_flags = cpu_to_le32((u32)rate_plcp | rate_flags);
}

/*
 * Sets the fields in the Tx cmd that are crypto related
 */
static void iwl_mvm_set_tx_cmd_crypto(struct iwl_mvm *mvm,
				      struct ieee80211_tx_info *info,
				      struct iwl_tx_cmd *tx_cmd,
				      struct sk_buff *skb_frag)
{
	struct ieee80211_key_conf *keyconf = info->control.hw_key;

	switch (keyconf->cipher) {
	case WLAN_CIPHER_SUITE_CCMP:
		tx_cmd->sec_ctl = TX_CMD_SEC_CCM;
		memcpy(tx_cmd->key, keyconf->key, keyconf->keylen);
		if (info->flags & IEEE80211_TX_CTL_AMPDU)
			tx_cmd->tx_flags |= cpu_to_le32(TX_CMD_FLG_CCMP_AGG);
		break;

	case WLAN_CIPHER_SUITE_TKIP:
		tx_cmd->sec_ctl = TX_CMD_SEC_TKIP;
		ieee80211_get_tkip_p2k(keyconf, skb_frag, tx_cmd->key);
		break;

	case WLAN_CIPHER_SUITE_WEP104:
		tx_cmd->sec_ctl |= TX_CMD_SEC_KEY128;
		/* fall through */
	case WLAN_CIPHER_SUITE_WEP40:
		tx_cmd->sec_ctl |= TX_CMD_SEC_WEP |
			((keyconf->keyidx << TX_CMD_SEC_WEP_KEY_IDX_POS) &
			  TX_CMD_SEC_WEP_KEY_IDX_MSK);

		memcpy(&tx_cmd->key[3], keyconf->key, keyconf->keylen);
		break;
	default:
		IWL_ERR(mvm, "Unknown encode cipher %x\n", keyconf->cipher);
		break;
	}
}

/*
 * Allocates and sets the Tx cmd the driver data pointers in the skb
 */
static struct iwl_device_cmd *
iwl_mvm_set_tx_params(struct iwl_mvm *mvm, struct sk_buff *skb,
		      struct ieee80211_sta *sta, u8 sta_id)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	struct iwl_device_cmd *dev_cmd;
	struct iwl_tx_cmd *tx_cmd;

	dev_cmd = iwl_trans_alloc_tx_cmd(mvm->trans);

	if (unlikely(!dev_cmd))
		return NULL;

	memset(dev_cmd, 0, sizeof(*dev_cmd));
	tx_cmd = (struct iwl_tx_cmd *)dev_cmd->payload;

	if (info->control.hw_key)
		iwl_mvm_set_tx_cmd_crypto(mvm, info, tx_cmd, skb);

	iwl_mvm_set_tx_cmd(mvm, skb, tx_cmd, info, sta_id);

	iwl_mvm_set_tx_cmd_rate(mvm, tx_cmd, info, sta, hdr->frame_control);

	memset(&info->status, 0, sizeof(info->status));

	info->driver_data[0] = NULL;
	info->driver_data[1] = dev_cmd;

	return dev_cmd;
}

int iwl_mvm_tx_skb_non_sta(struct iwl_mvm *mvm, struct sk_buff *skb)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	struct iwl_device_cmd *dev_cmd;
	struct iwl_tx_cmd *tx_cmd;
	u8 sta_id;

	if (WARN_ON_ONCE(info->flags & IEEE80211_TX_CTL_AMPDU))
		return -1;

	if (WARN_ON_ONCE(info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM &&
			 (!info->control.vif ||
			  info->hw_queue != info->control.vif->cab_queue)))
		return -1;

	/*
	 * If the interface on which frame is sent is the P2P_DEVICE
	 * or an AP/GO interface use the broadcast station associated
	 * with it; otherwise use the AUX station.
	 */
	if (info->control.vif &&
	    (info->control.vif->type == NL80211_IFTYPE_P2P_DEVICE ||
	     info->control.vif->type == NL80211_IFTYPE_AP)) {
		struct iwl_mvm_vif *mvmvif =
			iwl_mvm_vif_from_mac80211(info->control.vif);
		sta_id = mvmvif->bcast_sta.sta_id;
	} else {
		sta_id = mvm->aux_sta.sta_id;
	}

	IWL_DEBUG_TX(mvm, "station Id %d, queue=%d\n", sta_id, info->hw_queue);

	dev_cmd = iwl_mvm_set_tx_params(mvm, skb, NULL, sta_id);
	if (!dev_cmd)
		return -1;

	/* From now on, we cannot access info->control */
	tx_cmd = (struct iwl_tx_cmd *)dev_cmd->payload;

	/* Copy MAC header from skb into command buffer */
	memcpy(tx_cmd->hdr, hdr, ieee80211_hdrlen(hdr->frame_control));

	if (iwl_trans_tx(mvm->trans, skb, dev_cmd, info->hw_queue)) {
		iwl_trans_free_tx_cmd(mvm->trans, dev_cmd);
		return -1;
	}

	return 0;
}

/*
 * Sets the fields in the Tx cmd that are crypto related
 */
int iwl_mvm_tx_skb(struct iwl_mvm *mvm, struct sk_buff *skb,
		   struct ieee80211_sta *sta)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	struct iwl_mvm_sta *mvmsta;
	struct iwl_device_cmd *dev_cmd;
	struct iwl_tx_cmd *tx_cmd;
	__le16 fc;
	u16 seq_number = 0;
	u8 tid = IWL_MAX_TID_COUNT;
	u8 txq_id = info->hw_queue;
	bool is_data_qos = false, is_ampdu = false;

	mvmsta = (void *)sta->drv_priv;
	fc = hdr->frame_control;

	if (WARN_ON_ONCE(!mvmsta))
		return -1;

	if (WARN_ON_ONCE(mvmsta->sta_id == IWL_MVM_STATION_COUNT))
		return -1;

	dev_cmd = iwl_mvm_set_tx_params(mvm, skb, sta, mvmsta->sta_id);
	if (!dev_cmd)
		goto drop;

	tx_cmd = (struct iwl_tx_cmd *)dev_cmd->payload;
	/* From now on, we cannot access info->control */

	spin_lock(&mvmsta->lock);

	if (ieee80211_is_data_qos(fc) && !ieee80211_is_qos_nullfunc(fc)) {
		u8 *qc = NULL;
		qc = ieee80211_get_qos_ctl(hdr);
		tid = qc[0] & IEEE80211_QOS_CTL_TID_MASK;
		if (WARN_ON_ONCE(tid >= IWL_MAX_TID_COUNT))
			goto drop_unlock_sta;

		seq_number = mvmsta->tid_data[tid].seq_number;
		seq_number &= IEEE80211_SCTL_SEQ;
		hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
		hdr->seq_ctrl |= cpu_to_le16(seq_number);
		seq_number += 0x10;
		is_data_qos = true;
		is_ampdu = info->flags & IEEE80211_TX_CTL_AMPDU;
	}

	/* Copy MAC header from skb into command buffer */
	memcpy(tx_cmd->hdr, hdr, ieee80211_hdrlen(fc));

	WARN_ON_ONCE(info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM);

	if (is_ampdu) {
		if (WARN_ON_ONCE(mvmsta->tid_data[tid].state != IWL_AGG_ON))
			goto drop_unlock_sta;
		txq_id = mvmsta->tid_data[tid].txq_id;
	}

	IWL_DEBUG_TX(mvm, "TX to [%d|%d] Q:%d - seq: 0x%x\n", mvmsta->sta_id,
		     tid, txq_id, seq_number);

	/* NOTE: aggregation will need changes here (for txq id) */
	if (iwl_trans_tx(mvm->trans, skb, dev_cmd, txq_id))
		goto drop_unlock_sta;

	if (is_data_qos && !ieee80211_has_morefrags(fc))
		mvmsta->tid_data[tid].seq_number = seq_number;

	spin_unlock(&mvmsta->lock);

	if (txq_id < IWL_MVM_FIRST_AGG_QUEUE)
		atomic_inc(&mvm->pending_frames[mvmsta->sta_id]);

	return 0;

drop_unlock_sta:
	iwl_trans_free_tx_cmd(mvm->trans, dev_cmd);
	spin_unlock(&mvmsta->lock);
drop:
	return -1;
}

static void iwl_mvm_check_ratid_empty(struct iwl_mvm *mvm,
				      struct ieee80211_sta *sta, u8 tid)
{
	struct iwl_mvm_sta *mvmsta = (void *)sta->drv_priv;
	struct iwl_mvm_tid_data *tid_data = &mvmsta->tid_data[tid];
	struct ieee80211_vif *vif = mvmsta->vif;

	lockdep_assert_held(&mvmsta->lock);

	if (tid_data->ssn != tid_data->next_reclaimed)
		return;

	switch (tid_data->state) {
	case IWL_EMPTYING_HW_QUEUE_ADDBA:
		IWL_DEBUG_TX_QUEUES(mvm,
				    "Can continue addBA flow ssn = next_recl = %d\n",
				    tid_data->next_reclaimed);
		tid_data->state = IWL_AGG_STARTING;
		ieee80211_start_tx_ba_cb_irqsafe(vif, sta->addr, tid);
		break;

	case IWL_EMPTYING_HW_QUEUE_DELBA:
		IWL_DEBUG_TX_QUEUES(mvm,
				    "Can continue DELBA flow ssn = next_recl = %d\n",
				    tid_data->next_reclaimed);
		iwl_trans_txq_disable(mvm->trans, tid_data->txq_id);
		tid_data->state = IWL_AGG_OFF;
		/*
		 * we can't hold the mutex - but since we are after a sequence
		 * point (call to iwl_trans_txq_disable), so we don't even need
		 * a memory barrier.
		 */
		mvm->queue_to_mac80211[tid_data->txq_id] =
					IWL_INVALID_MAC80211_QUEUE;
		ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid);
		break;

	default:
		break;
	}
}

#ifdef CONFIG_IWLWIFI_DEBUG
const char *iwl_mvm_get_tx_fail_reason(u32 status)
{
#define TX_STATUS_FAIL(x) case TX_STATUS_FAIL_ ## x: return #x
#define TX_STATUS_POSTPONE(x) case TX_STATUS_POSTPONE_ ## x: return #x

	switch (status & TX_STATUS_MSK) {
	case TX_STATUS_SUCCESS:
		return "SUCCESS";
	TX_STATUS_POSTPONE(DELAY);
	TX_STATUS_POSTPONE(FEW_BYTES);
	TX_STATUS_POSTPONE(BT_PRIO);
	TX_STATUS_POSTPONE(QUIET_PERIOD);
	TX_STATUS_POSTPONE(CALC_TTAK);
	TX_STATUS_FAIL(INTERNAL_CROSSED_RETRY);
	TX_STATUS_FAIL(SHORT_LIMIT);
	TX_STATUS_FAIL(LONG_LIMIT);
	TX_STATUS_FAIL(UNDERRUN);
	TX_STATUS_FAIL(DRAIN_FLOW);
	TX_STATUS_FAIL(RFKILL_FLUSH);
	TX_STATUS_FAIL(LIFE_EXPIRE);
	TX_STATUS_FAIL(DEST_PS);
	TX_STATUS_FAIL(HOST_ABORTED);
	TX_STATUS_FAIL(BT_RETRY);
	TX_STATUS_FAIL(STA_INVALID);
	TX_STATUS_FAIL(FRAG_DROPPED);
	TX_STATUS_FAIL(TID_DISABLE);
	TX_STATUS_FAIL(FIFO_FLUSHED);
	TX_STATUS_FAIL(SMALL_CF_POLL);
	TX_STATUS_FAIL(FW_DROP);
	TX_STATUS_FAIL(STA_COLOR_MISMATCH);
	}

	return "UNKNOWN";

#undef TX_STATUS_FAIL
#undef TX_STATUS_POSTPONE
}
#endif /* CONFIG_IWLWIFI_DEBUG */

/**
 * translate ucode response to mac80211 tx status control values
 */
static void iwl_mvm_hwrate_to_tx_control(u32 rate_n_flags,
					 struct ieee80211_tx_info *info)
{
	struct ieee80211_tx_rate *r = &info->status.rates[0];

	info->status.antenna =
		((rate_n_flags & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS);
	if (rate_n_flags & RATE_HT_MCS_GF_MSK)
		r->flags |= IEEE80211_TX_RC_GREEN_FIELD;
	switch (rate_n_flags & RATE_MCS_CHAN_WIDTH_MSK) {
	case RATE_MCS_CHAN_WIDTH_20:
		break;
	case RATE_MCS_CHAN_WIDTH_40:
		r->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
		break;
	case RATE_MCS_CHAN_WIDTH_80:
		r->flags |= IEEE80211_TX_RC_80_MHZ_WIDTH;
		break;
	case RATE_MCS_CHAN_WIDTH_160:
		r->flags |= IEEE80211_TX_RC_160_MHZ_WIDTH;
		break;
	}
	if (rate_n_flags & RATE_MCS_SGI_MSK)
		r->flags |= IEEE80211_TX_RC_SHORT_GI;
	if (rate_n_flags & RATE_MCS_HT_MSK) {
		r->flags |= IEEE80211_TX_RC_MCS;
		r->idx = rate_n_flags & RATE_HT_MCS_INDEX_MSK;
	} else if (rate_n_flags & RATE_MCS_VHT_MSK) {
		ieee80211_rate_set_vht(
			r, rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK,
			((rate_n_flags & RATE_VHT_MCS_NSS_MSK) >>
						RATE_VHT_MCS_NSS_POS) + 1);
		r->flags |= IEEE80211_TX_RC_VHT_MCS;
	} else {
		r->idx = iwl_mvm_legacy_rate_to_mac80211_idx(rate_n_flags,
							     info->band);
	}
}

static void iwl_mvm_rx_tx_cmd_single(struct iwl_mvm *mvm,
				     struct iwl_rx_packet *pkt)
{
	struct ieee80211_sta *sta;
	u16 sequence = le16_to_cpu(pkt->hdr.sequence);
	int txq_id = SEQ_TO_QUEUE(sequence);
	struct iwl_mvm_tx_resp *tx_resp = (void *)pkt->data;
	int sta_id = IWL_MVM_TX_RES_GET_RA(tx_resp->ra_tid);
	int tid = IWL_MVM_TX_RES_GET_TID(tx_resp->ra_tid);
	u32 status = le16_to_cpu(tx_resp->status.status);
	u16 ssn = iwl_mvm_get_scd_ssn(tx_resp);
	struct iwl_mvm_sta *mvmsta;
	struct sk_buff_head skbs;
	u8 skb_freed = 0;
	u16 next_reclaimed, seq_ctl;

	__skb_queue_head_init(&skbs);

	seq_ctl = le16_to_cpu(tx_resp->seq_ctl);

	/* we can free until ssn % q.n_bd not inclusive */
	iwl_trans_reclaim(mvm->trans, txq_id, ssn, &skbs);

	while (!skb_queue_empty(&skbs)) {
		struct sk_buff *skb = __skb_dequeue(&skbs);
		struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);

		skb_freed++;

		iwl_trans_free_tx_cmd(mvm->trans, info->driver_data[1]);

		memset(&info->status, 0, sizeof(info->status));

		info->flags &= ~IEEE80211_TX_CTL_AMPDU;

		/* inform mac80211 about what happened with the frame */
		switch (status & TX_STATUS_MSK) {
		case TX_STATUS_SUCCESS:
		case TX_STATUS_DIRECT_DONE:
			info->flags |= IEEE80211_TX_STAT_ACK;
			break;
		case TX_STATUS_FAIL_DEST_PS:
			info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
			break;
		default:
			break;
		}

		info->status.rates[0].count = tx_resp->failure_frame + 1;
		iwl_mvm_hwrate_to_tx_control(le32_to_cpu(tx_resp->initial_rate),
					     info);

		/* Single frame failure in an AMPDU queue => send BAR */
		if (txq_id >= IWL_MVM_FIRST_AGG_QUEUE &&
		    !(info->flags & IEEE80211_TX_STAT_ACK))
			info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;

		/* W/A FW bug: seq_ctl is wrong when the queue is flushed */
		if (status == TX_STATUS_FAIL_FIFO_FLUSHED) {
			struct ieee80211_hdr *hdr = (void *)skb->data;
			seq_ctl = le16_to_cpu(hdr->seq_ctrl);
		}

		ieee80211_tx_status_ni(mvm->hw, skb);
	}

	if (txq_id >= IWL_MVM_FIRST_AGG_QUEUE) {
		/* If this is an aggregation queue, we use the ssn since:
		 * ssn = wifi seq_num % 256.
		 * The seq_ctl is the sequence control of the packet to which
		 * this Tx response relates. But if there is a hole in the
		 * bitmap of the BA we received, this Tx response may allow to
		 * reclaim the hole and all the subsequent packets that were
		 * already acked. In that case, seq_ctl != ssn, and the next
		 * packet to be reclaimed will be ssn and not seq_ctl. In that
		 * case, several packets will be reclaimed even if
		 * frame_count = 1.
		 *
		 * The ssn is the index (% 256) of the latest packet that has
		 * treated (acked / dropped) + 1.
		 */
		next_reclaimed = ssn;
	} else {
		/* The next packet to be reclaimed is the one after this one */
		next_reclaimed = IEEE80211_SEQ_TO_SN(seq_ctl + 0x10);
	}

	IWL_DEBUG_TX_REPLY(mvm,
			   "TXQ %d status %s (0x%08x)\n",
			   txq_id, iwl_mvm_get_tx_fail_reason(status), status);

	IWL_DEBUG_TX_REPLY(mvm,
			   "\t\t\t\tinitial_rate 0x%x retries %d, idx=%d ssn=%d next_reclaimed=0x%x seq_ctl=0x%x\n",
			   le32_to_cpu(tx_resp->initial_rate),
			   tx_resp->failure_frame, SEQ_TO_INDEX(sequence),
			   ssn, next_reclaimed, seq_ctl);

	rcu_read_lock();

	sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);

	if (!IS_ERR_OR_NULL(sta)) {
		mvmsta = (void *)sta->drv_priv;

		if (tid != IWL_TID_NON_QOS) {
			struct iwl_mvm_tid_data *tid_data =
				&mvmsta->tid_data[tid];

			spin_lock_bh(&mvmsta->lock);
			tid_data->next_reclaimed = next_reclaimed;
			IWL_DEBUG_TX_REPLY(mvm, "Next reclaimed packet:%d\n",
					   next_reclaimed);
			iwl_mvm_check_ratid_empty(mvm, sta, tid);
			spin_unlock_bh(&mvmsta->lock);
		}

#ifdef CONFIG_PM_SLEEP
		mvmsta->last_seq_ctl = seq_ctl;
#endif
	} else {
		sta = NULL;
		mvmsta = NULL;
	}

	/*
	 * If the txq is not an AMPDU queue, there is no chance we freed
	 * several skbs. Check that out...
	 */
	if (txq_id < IWL_MVM_FIRST_AGG_QUEUE && !WARN_ON(skb_freed > 1) &&
	    atomic_sub_and_test(skb_freed, &mvm->pending_frames[sta_id])) {
		if (mvmsta) {
			/*
			 * If there are no pending frames for this STA, notify
			 * mac80211 that this station can go to sleep in its
			 * STA table.
			 */
			if (mvmsta->vif->type == NL80211_IFTYPE_AP)
				ieee80211_sta_block_awake(mvm->hw, sta, false);
			/*
			 * We might very well have taken mvmsta pointer while
			 * the station was being removed. The remove flow might
			 * have seen a pending_frame (because we didn't take
			 * the lock) even if now the queues are drained. So make
			 * really sure now that this the station is not being
			 * removed. If it is, run the drain worker to remove it.
			 */
			spin_lock_bh(&mvmsta->lock);
			sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);
			if (IS_ERR_OR_NULL(sta)) {
				/*
				 * Station disappeared in the meantime:
				 * so we are draining.
				 */
				set_bit(sta_id, mvm->sta_drained);
				schedule_work(&mvm->sta_drained_wk);
			}
			spin_unlock_bh(&mvmsta->lock);
		} else if (!mvmsta) {
			/* Tx response without STA, so we are draining */
			set_bit(sta_id, mvm->sta_drained);
			schedule_work(&mvm->sta_drained_wk);
		}
	}

	rcu_read_unlock();
}

#ifdef CONFIG_IWLWIFI_DEBUG
#define AGG_TX_STATE_(x) case AGG_TX_STATE_ ## x: return #x
static const char *iwl_get_agg_tx_status(u16 status)
{
	switch (status & AGG_TX_STATE_STATUS_MSK) {
	AGG_TX_STATE_(TRANSMITTED);
	AGG_TX_STATE_(UNDERRUN);
	AGG_TX_STATE_(BT_PRIO);
	AGG_TX_STATE_(FEW_BYTES);
	AGG_TX_STATE_(ABORT);
	AGG_TX_STATE_(LAST_SENT_TTL);
	AGG_TX_STATE_(LAST_SENT_TRY_CNT);
	AGG_TX_STATE_(LAST_SENT_BT_KILL);
	AGG_TX_STATE_(SCD_QUERY);
	AGG_TX_STATE_(TEST_BAD_CRC32);
	AGG_TX_STATE_(RESPONSE);
	AGG_TX_STATE_(DUMP_TX);
	AGG_TX_STATE_(DELAY_TX);
	}

	return "UNKNOWN";
}

static void iwl_mvm_rx_tx_cmd_agg_dbg(struct iwl_mvm *mvm,
				      struct iwl_rx_packet *pkt)
{
	struct iwl_mvm_tx_resp *tx_resp = (void *)pkt->data;
	struct agg_tx_status *frame_status = &tx_resp->status;
	int i;

	for (i = 0; i < tx_resp->frame_count; i++) {
		u16 fstatus = le16_to_cpu(frame_status[i].status);

		IWL_DEBUG_TX_REPLY(mvm,
				   "status %s (0x%04x), try-count (%d) seq (0x%x)\n",
				   iwl_get_agg_tx_status(fstatus),
				   fstatus & AGG_TX_STATE_STATUS_MSK,
				   (fstatus & AGG_TX_STATE_TRY_CNT_MSK) >>
					AGG_TX_STATE_TRY_CNT_POS,
				   le16_to_cpu(frame_status[i].sequence));
	}
}
#else
static void iwl_mvm_rx_tx_cmd_agg_dbg(struct iwl_mvm *mvm,
				      struct iwl_rx_packet *pkt)
{}
#endif /* CONFIG_IWLWIFI_DEBUG */

static void iwl_mvm_rx_tx_cmd_agg(struct iwl_mvm *mvm,
				  struct iwl_rx_packet *pkt)
{
	struct iwl_mvm_tx_resp *tx_resp = (void *)pkt->data;
	int sta_id = IWL_MVM_TX_RES_GET_RA(tx_resp->ra_tid);
	int tid = IWL_MVM_TX_RES_GET_TID(tx_resp->ra_tid);
	u16 sequence = le16_to_cpu(pkt->hdr.sequence);
	struct ieee80211_sta *sta;

	if (WARN_ON_ONCE(SEQ_TO_QUEUE(sequence) < IWL_MVM_FIRST_AGG_QUEUE))
		return;

	if (WARN_ON_ONCE(tid == IWL_TID_NON_QOS))
		return;

	iwl_mvm_rx_tx_cmd_agg_dbg(mvm, pkt);

	rcu_read_lock();

	sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);

	if (!WARN_ON_ONCE(IS_ERR_OR_NULL(sta))) {
		struct iwl_mvm_sta *mvmsta = (void *)sta->drv_priv;
		mvmsta->tid_data[tid].rate_n_flags =
			le32_to_cpu(tx_resp->initial_rate);
	}

	rcu_read_unlock();
}

int iwl_mvm_rx_tx_cmd(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
		      struct iwl_device_cmd *cmd)
{
	struct iwl_rx_packet *pkt = rxb_addr(rxb);
	struct iwl_mvm_tx_resp *tx_resp = (void *)pkt->data;

	if (tx_resp->frame_count == 1)
		iwl_mvm_rx_tx_cmd_single(mvm, pkt);
	else
		iwl_mvm_rx_tx_cmd_agg(mvm, pkt);

	return 0;
}

int iwl_mvm_rx_ba_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
			struct iwl_device_cmd *cmd)
{
	struct iwl_rx_packet *pkt = rxb_addr(rxb);
	struct iwl_mvm_ba_notif *ba_notif = (void *)pkt->data;
	struct sk_buff_head reclaimed_skbs;
	struct iwl_mvm_tid_data *tid_data;
	struct ieee80211_tx_info *info;
	struct ieee80211_sta *sta;
	struct iwl_mvm_sta *mvmsta;
	struct ieee80211_hdr *hdr;
	struct sk_buff *skb;
	int sta_id, tid, freed;

	/* "flow" corresponds to Tx queue */
	u16 scd_flow = le16_to_cpu(ba_notif->scd_flow);

	/* "ssn" is start of block-ack Tx window, corresponds to index
	 * (in Tx queue's circular buffer) of first TFD/frame in window */
	u16 ba_resp_scd_ssn = le16_to_cpu(ba_notif->scd_ssn);

	sta_id = ba_notif->sta_id;
	tid = ba_notif->tid;

	rcu_read_lock();

	sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);

	/* Reclaiming frames for a station that has been deleted ? */
	if (WARN_ON_ONCE(IS_ERR_OR_NULL(sta))) {
		rcu_read_unlock();
		return 0;
	}

	mvmsta = (void *)sta->drv_priv;
	tid_data = &mvmsta->tid_data[tid];

	if (WARN_ONCE(tid_data->txq_id != scd_flow, "Q %d, tid %d, flow %d",
		      tid_data->txq_id, tid, scd_flow)) {
		rcu_read_unlock();
		return 0;
	}

	spin_lock_bh(&mvmsta->lock);

	__skb_queue_head_init(&reclaimed_skbs);

	/*
	 * Release all TFDs before the SSN, i.e. all TFDs in front of
	 * block-ack window (we assume that they've been successfully
	 * transmitted ... if not, it's too late anyway).
	 */
	iwl_trans_reclaim(mvm->trans, scd_flow, ba_resp_scd_ssn,
			  &reclaimed_skbs);

	IWL_DEBUG_TX_REPLY(mvm,
			   "BA_NOTIFICATION Received from %pM, sta_id = %d\n",
			   (u8 *)&ba_notif->sta_addr_lo32,
			   ba_notif->sta_id);
	IWL_DEBUG_TX_REPLY(mvm,
			   "TID = %d, SeqCtl = %d, bitmap = 0x%llx, scd_flow = %d, scd_ssn = %d sent:%d, acked:%d\n",
			   ba_notif->tid, le16_to_cpu(ba_notif->seq_ctl),
			   (unsigned long long)le64_to_cpu(ba_notif->bitmap),
			   scd_flow, ba_resp_scd_ssn, ba_notif->txed,
			   ba_notif->txed_2_done);

	tid_data->next_reclaimed = ba_resp_scd_ssn;

	iwl_mvm_check_ratid_empty(mvm, sta, tid);

	freed = 0;

	skb_queue_walk(&reclaimed_skbs, skb) {
		hdr = (struct ieee80211_hdr *)skb->data;

		if (ieee80211_is_data_qos(hdr->frame_control))
			freed++;
		else
			WARN_ON_ONCE(1);

		info = IEEE80211_SKB_CB(skb);
		iwl_trans_free_tx_cmd(mvm->trans, info->driver_data[1]);

		if (freed == 1) {
			/* this is the first skb we deliver in this batch */
			/* put the rate scaling data there */
			info = IEEE80211_SKB_CB(skb);
			memset(&info->status, 0, sizeof(info->status));
			info->flags |= IEEE80211_TX_STAT_ACK;
			info->flags |= IEEE80211_TX_STAT_AMPDU;
			info->status.ampdu_ack_len = ba_notif->txed_2_done;
			info->status.ampdu_len = ba_notif->txed;
			iwl_mvm_hwrate_to_tx_control(tid_data->rate_n_flags,
						     info);
		}
	}

	spin_unlock_bh(&mvmsta->lock);

	rcu_read_unlock();

	while (!skb_queue_empty(&reclaimed_skbs)) {
		skb = __skb_dequeue(&reclaimed_skbs);
		ieee80211_tx_status_ni(mvm->hw, skb);
	}

	return 0;
}

int iwl_mvm_flush_tx_path(struct iwl_mvm *mvm, u32 tfd_msk, bool sync)
{
	int ret;
	struct iwl_tx_path_flush_cmd flush_cmd = {
		.queues_ctl = cpu_to_le32(tfd_msk),
		.flush_ctl = cpu_to_le16(DUMP_TX_FIFO_FLUSH),
	};

	u32 flags = sync ? CMD_SYNC : CMD_ASYNC;

	ret = iwl_mvm_send_cmd_pdu(mvm, TXPATH_FLUSH, flags,
				   sizeof(flush_cmd), &flush_cmd);
	if (ret)
		IWL_ERR(mvm, "Failed to send flush command (%d)\n", ret);
	return ret;
}