aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/net/wireless/iwlwifi/mvm/sta.c
blob: 5c664ed54400ed65c5232c9092c62dceaeadfdcd (plain) (blame)
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
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
/******************************************************************************
 *
 * 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 <net/mac80211.h>

#include "mvm.h"
#include "sta.h"

static int iwl_mvm_find_free_sta_id(struct iwl_mvm *mvm)
{
	int sta_id;

	WARN_ON_ONCE(test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status));

	lockdep_assert_held(&mvm->mutex);

	/* Don't take rcu_read_lock() since we are protected by mvm->mutex */
	for (sta_id = 0; sta_id < IWL_MVM_STATION_COUNT; sta_id++)
		if (!rcu_dereference_protected(mvm->fw_id_to_mac_id[sta_id],
					       lockdep_is_held(&mvm->mutex)))
			return sta_id;
	return IWL_MVM_STATION_COUNT;
}

/* send station add/update command to firmware */
int iwl_mvm_sta_send_to_fw(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
			   bool update)
{
	struct iwl_mvm_sta *mvm_sta = (void *)sta->drv_priv;
	struct iwl_mvm_add_sta_cmd add_sta_cmd;
	int ret;
	u32 status;
	u32 agg_size = 0, mpdu_dens = 0;

	memset(&add_sta_cmd, 0, sizeof(add_sta_cmd));

	add_sta_cmd.sta_id = mvm_sta->sta_id;
	add_sta_cmd.mac_id_n_color = cpu_to_le32(mvm_sta->mac_id_n_color);
	if (!update) {
		add_sta_cmd.tfd_queue_msk = cpu_to_le32(mvm_sta->tfd_queue_msk);
		memcpy(&add_sta_cmd.addr, sta->addr, ETH_ALEN);
	}
	add_sta_cmd.add_modify = update ? 1 : 0;

	add_sta_cmd.station_flags_msk |= cpu_to_le32(STA_FLG_FAT_EN_MSK |
						     STA_FLG_MIMO_EN_MSK);

	switch (sta->bandwidth) {
	case IEEE80211_STA_RX_BW_160:
		add_sta_cmd.station_flags |= cpu_to_le32(STA_FLG_FAT_EN_160MHZ);
		/* fall through */
	case IEEE80211_STA_RX_BW_80:
		add_sta_cmd.station_flags |= cpu_to_le32(STA_FLG_FAT_EN_80MHZ);
		/* fall through */
	case IEEE80211_STA_RX_BW_40:
		add_sta_cmd.station_flags |= cpu_to_le32(STA_FLG_FAT_EN_40MHZ);
		/* fall through */
	case IEEE80211_STA_RX_BW_20:
		if (sta->ht_cap.ht_supported)
			add_sta_cmd.station_flags |=
				cpu_to_le32(STA_FLG_FAT_EN_20MHZ);
		break;
	}

	switch (sta->rx_nss) {
	case 1:
		add_sta_cmd.station_flags |= cpu_to_le32(STA_FLG_MIMO_EN_SISO);
		break;
	case 2:
		add_sta_cmd.station_flags |= cpu_to_le32(STA_FLG_MIMO_EN_MIMO2);
		break;
	case 3 ... 8:
		add_sta_cmd.station_flags |= cpu_to_le32(STA_FLG_MIMO_EN_MIMO3);
		break;
	}

	switch (sta->smps_mode) {
	case IEEE80211_SMPS_AUTOMATIC:
	case IEEE80211_SMPS_NUM_MODES:
		WARN_ON(1);
		break;
	case IEEE80211_SMPS_STATIC:
		/* override NSS */
		add_sta_cmd.station_flags &= ~cpu_to_le32(STA_FLG_MIMO_EN_MSK);
		add_sta_cmd.station_flags |= cpu_to_le32(STA_FLG_MIMO_EN_SISO);
		break;
	case IEEE80211_SMPS_DYNAMIC:
		add_sta_cmd.station_flags |= cpu_to_le32(STA_FLG_RTS_MIMO_PROT);
		break;
	case IEEE80211_SMPS_OFF:
		/* nothing */
		break;
	}

	if (sta->ht_cap.ht_supported) {
		add_sta_cmd.station_flags_msk |=
			cpu_to_le32(STA_FLG_MAX_AGG_SIZE_MSK |
				    STA_FLG_AGG_MPDU_DENS_MSK);

		mpdu_dens = sta->ht_cap.ampdu_density;
	}

	if (sta->vht_cap.vht_supported) {
		agg_size = sta->vht_cap.cap &
			IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK;
		agg_size >>=
			IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_SHIFT;
	} else if (sta->ht_cap.ht_supported) {
		agg_size = sta->ht_cap.ampdu_factor;
	}

	add_sta_cmd.station_flags |=
		cpu_to_le32(agg_size << STA_FLG_MAX_AGG_SIZE_SHIFT);
	add_sta_cmd.station_flags |=
		cpu_to_le32(mpdu_dens << STA_FLG_AGG_MPDU_DENS_SHIFT);

	status = ADD_STA_SUCCESS;
	ret = iwl_mvm_send_cmd_pdu_status(mvm, ADD_STA, sizeof(add_sta_cmd),
					  &add_sta_cmd, &status);
	if (ret)
		return ret;

	switch (status) {
	case ADD_STA_SUCCESS:
		IWL_DEBUG_ASSOC(mvm, "ADD_STA PASSED\n");
		break;
	default:
		ret = -EIO;
		IWL_ERR(mvm, "ADD_STA failed\n");
		break;
	}

	return ret;
}

int iwl_mvm_add_sta(struct iwl_mvm *mvm,
		    struct ieee80211_vif *vif,
		    struct ieee80211_sta *sta)
{
	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
	struct iwl_mvm_sta *mvm_sta = (void *)sta->drv_priv;
	int i, ret, sta_id;

	lockdep_assert_held(&mvm->mutex);

	if (!test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status))
		sta_id = iwl_mvm_find_free_sta_id(mvm);
	else
		sta_id = mvm_sta->sta_id;

	if (WARN_ON_ONCE(sta_id == IWL_MVM_STATION_COUNT))
		return -ENOSPC;

	spin_lock_init(&mvm_sta->lock);

	mvm_sta->sta_id = sta_id;
	mvm_sta->mac_id_n_color = FW_CMD_ID_AND_COLOR(mvmvif->id,
						      mvmvif->color);
	mvm_sta->vif = vif;
	mvm_sta->max_agg_bufsize = LINK_QUAL_AGG_FRAME_LIMIT_DEF;

	/* HW restart, don't assume the memory has been zeroed */
	atomic_set(&mvm->pending_frames[sta_id], 0);
	mvm_sta->tid_disable_agg = 0;
	mvm_sta->tfd_queue_msk = 0;
	for (i = 0; i < IEEE80211_NUM_ACS; i++)
		if (vif->hw_queue[i] != IEEE80211_INVAL_HW_QUEUE)
			mvm_sta->tfd_queue_msk |= BIT(vif->hw_queue[i]);

	if (vif->cab_queue != IEEE80211_INVAL_HW_QUEUE)
		mvm_sta->tfd_queue_msk |= BIT(vif->cab_queue);

	/* for HW restart - need to reset the seq_number etc... */
	memset(mvm_sta->tid_data, 0, sizeof(mvm_sta->tid_data));

	ret = iwl_mvm_sta_send_to_fw(mvm, sta, false);
	if (ret)
		return ret;

	/* The first station added is the AP, the others are TDLS STAs */
	if (vif->type == NL80211_IFTYPE_STATION &&
	    mvmvif->ap_sta_id == IWL_MVM_STATION_COUNT)
		mvmvif->ap_sta_id = sta_id;

	rcu_assign_pointer(mvm->fw_id_to_mac_id[sta_id], sta);

	return 0;
}

int iwl_mvm_update_sta(struct iwl_mvm *mvm,
		       struct ieee80211_vif *vif,
		       struct ieee80211_sta *sta)
{
	return iwl_mvm_sta_send_to_fw(mvm, sta, true);
}

int iwl_mvm_drain_sta(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
		      bool drain)
{
	struct iwl_mvm_add_sta_cmd cmd = {};
	int ret;
	u32 status;

	lockdep_assert_held(&mvm->mutex);

	cmd.mac_id_n_color = cpu_to_le32(mvmsta->mac_id_n_color);
	cmd.sta_id = mvmsta->sta_id;
	cmd.add_modify = STA_MODE_MODIFY;
	cmd.station_flags = drain ? cpu_to_le32(STA_FLG_DRAIN_FLOW) : 0;
	cmd.station_flags_msk = cpu_to_le32(STA_FLG_DRAIN_FLOW);

	status = ADD_STA_SUCCESS;
	ret = iwl_mvm_send_cmd_pdu_status(mvm, ADD_STA, sizeof(cmd),
					  &cmd, &status);
	if (ret)
		return ret;

	switch (status) {
	case ADD_STA_SUCCESS:
		IWL_DEBUG_INFO(mvm, "Frames for staid %d will drained in fw\n",
			       mvmsta->sta_id);
		break;
	default:
		ret = -EIO;
		IWL_ERR(mvm, "Couldn't drain frames for staid %d\n",
			mvmsta->sta_id);
		break;
	}

	return ret;
}

/*
 * Remove a station from the FW table. Before sending the command to remove
 * the station validate that the station is indeed known to the driver (sanity
 * only).
 */
static int iwl_mvm_rm_sta_common(struct iwl_mvm *mvm, u8 sta_id)
{
	struct ieee80211_sta *sta;
	struct iwl_mvm_rm_sta_cmd rm_sta_cmd = {
		.sta_id = sta_id,
	};
	int ret;

	sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[sta_id],
					lockdep_is_held(&mvm->mutex));

	/* Note: internal stations are marked as error values */
	if (!sta) {
		IWL_ERR(mvm, "Invalid station id\n");
		return -EINVAL;
	}

	ret = iwl_mvm_send_cmd_pdu(mvm, REMOVE_STA, CMD_SYNC,
				   sizeof(rm_sta_cmd), &rm_sta_cmd);
	if (ret) {
		IWL_ERR(mvm, "Failed to remove station. Id=%d\n", sta_id);
		return ret;
	}

	return 0;
}

void iwl_mvm_sta_drained_wk(struct work_struct *wk)
{
	struct iwl_mvm *mvm = container_of(wk, struct iwl_mvm, sta_drained_wk);
	u8 sta_id;

	/*
	 * The mutex is needed because of the SYNC cmd, but not only: if the
	 * work would run concurrently with iwl_mvm_rm_sta, it would run before
	 * iwl_mvm_rm_sta sets the station as busy, and exit. Then
	 * iwl_mvm_rm_sta would set the station as busy, and nobody will clean
	 * that later.
	 */
	mutex_lock(&mvm->mutex);

	for_each_set_bit(sta_id, mvm->sta_drained, IWL_MVM_STATION_COUNT) {
		int ret;
		struct ieee80211_sta *sta =
			rcu_dereference_protected(mvm->fw_id_to_mac_id[sta_id],
						  lockdep_is_held(&mvm->mutex));

		/* This station is in use */
		if (!IS_ERR(sta))
			continue;

		if (PTR_ERR(sta) == -EINVAL) {
			IWL_ERR(mvm, "Drained sta %d, but it is internal?\n",
				sta_id);
			continue;
		}

		if (!sta) {
			IWL_ERR(mvm, "Drained sta %d, but it was NULL?\n",
				sta_id);
			continue;
		}

		WARN_ON(PTR_ERR(sta) != -EBUSY);
		/* This station was removed and we waited until it got drained,
		 * we can now proceed and remove it.
		 */
		ret = iwl_mvm_rm_sta_common(mvm, sta_id);
		if (ret) {
			IWL_ERR(mvm,
				"Couldn't remove sta %d after it was drained\n",
				sta_id);
			continue;
		}
		rcu_assign_pointer(mvm->fw_id_to_mac_id[sta_id], NULL);
		clear_bit(sta_id, mvm->sta_drained);
	}

	mutex_unlock(&mvm->mutex);
}

int iwl_mvm_rm_sta(struct iwl_mvm *mvm,
		   struct ieee80211_vif *vif,
		   struct ieee80211_sta *sta)
{
	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
	struct iwl_mvm_sta *mvm_sta = (void *)sta->drv_priv;
	int ret;

	lockdep_assert_held(&mvm->mutex);

	if (vif->type == NL80211_IFTYPE_STATION &&
	    mvmvif->ap_sta_id == mvm_sta->sta_id) {
		/* flush its queues here since we are freeing mvm_sta */
		ret = iwl_mvm_flush_tx_path(mvm, mvm_sta->tfd_queue_msk, true);

		/*
		 * Put a non-NULL since the fw station isn't removed.
		 * It will be removed after the MAC will be set as
		 * unassoc.
		 */
		rcu_assign_pointer(mvm->fw_id_to_mac_id[mvm_sta->sta_id],
				   ERR_PTR(-EINVAL));

		/* if we are associated - we can't remove the AP STA now */
		if (vif->bss_conf.assoc)
			return ret;

		/* unassoc - go ahead - remove the AP STA now */
		mvmvif->ap_sta_id = IWL_MVM_STATION_COUNT;
	}

	/*
	 * Make sure that the tx response code sees the station as -EBUSY and
	 * calls the drain worker.
	 */
	spin_lock_bh(&mvm_sta->lock);
	/*
	 * There are frames pending on the AC queues for this station.
	 * We need to wait until all the frames are drained...
	 */
	if (atomic_read(&mvm->pending_frames[mvm_sta->sta_id])) {
		rcu_assign_pointer(mvm->fw_id_to_mac_id[mvm_sta->sta_id],
				   ERR_PTR(-EBUSY));
		spin_unlock_bh(&mvm_sta->lock);
		ret = iwl_mvm_drain_sta(mvm, mvm_sta, true);
	} else {
		spin_unlock_bh(&mvm_sta->lock);
		ret = iwl_mvm_rm_sta_common(mvm, mvm_sta->sta_id);
		rcu_assign_pointer(mvm->fw_id_to_mac_id[mvm_sta->sta_id], NULL);
	}

	return ret;
}

int iwl_mvm_rm_sta_id(struct iwl_mvm *mvm,
		      struct ieee80211_vif *vif,
		      u8 sta_id)
{
	int ret = iwl_mvm_rm_sta_common(mvm, sta_id);

	lockdep_assert_held(&mvm->mutex);

	rcu_assign_pointer(mvm->fw_id_to_mac_id[sta_id], NULL);
	return ret;
}

int iwl_mvm_allocate_int_sta(struct iwl_mvm *mvm, struct iwl_mvm_int_sta *sta,
			     u32 qmask)
{
	if (!test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status)) {
		sta->sta_id = iwl_mvm_find_free_sta_id(mvm);
		if (WARN_ON_ONCE(sta->sta_id == IWL_MVM_STATION_COUNT))
			return -ENOSPC;
	}

	sta->tfd_queue_msk = qmask;

	/* put a non-NULL value so iterating over the stations won't stop */
	rcu_assign_pointer(mvm->fw_id_to_mac_id[sta->sta_id], ERR_PTR(-EINVAL));
	return 0;
}

void iwl_mvm_dealloc_int_sta(struct iwl_mvm *mvm, struct iwl_mvm_int_sta *sta)
{
	rcu_assign_pointer(mvm->fw_id_to_mac_id[sta->sta_id], NULL);
	memset(sta, 0, sizeof(struct iwl_mvm_int_sta));
	sta->sta_id = IWL_MVM_STATION_COUNT;
}

static int iwl_mvm_add_int_sta_common(struct iwl_mvm *mvm,
				      struct iwl_mvm_int_sta *sta,
				      const u8 *addr,
				      u16 mac_id, u16 color)
{
	struct iwl_mvm_add_sta_cmd cmd;
	int ret;
	u32 status;

	lockdep_assert_held(&mvm->mutex);

	memset(&cmd, 0, sizeof(struct iwl_mvm_add_sta_cmd));
	cmd.sta_id = sta->sta_id;
	cmd.mac_id_n_color = cpu_to_le32(FW_CMD_ID_AND_COLOR(mac_id,
							     color));

	cmd.tfd_queue_msk = cpu_to_le32(sta->tfd_queue_msk);

	if (addr)
		memcpy(cmd.addr, addr, ETH_ALEN);

	ret = iwl_mvm_send_cmd_pdu_status(mvm, ADD_STA, sizeof(cmd),
					  &cmd, &status);
	if (ret)
		return ret;

	switch (status) {
	case ADD_STA_SUCCESS:
		IWL_DEBUG_INFO(mvm, "Internal station added.\n");
		return 0;
	default:
		ret = -EIO;
		IWL_ERR(mvm, "Add internal station failed, status=0x%x\n",
			status);
		break;
	}
	return ret;
}

int iwl_mvm_add_aux_sta(struct iwl_mvm *mvm)
{
	int ret;

	lockdep_assert_held(&mvm->mutex);

	/* Add the aux station, but without any queues */
	ret = iwl_mvm_allocate_int_sta(mvm, &mvm->aux_sta, 0);
	if (ret)
		return ret;

	ret = iwl_mvm_add_int_sta_common(mvm, &mvm->aux_sta, NULL,
					 MAC_INDEX_AUX, 0);

	if (ret)
		iwl_mvm_dealloc_int_sta(mvm, &mvm->aux_sta);
	return ret;
}

/*
 * Send the add station command for the vif's broadcast station.
 * Assumes that the station was already allocated.
 *
 * @mvm: the mvm component
 * @vif: the interface to which the broadcast station is added
 * @bsta: the broadcast station to add.
 */
int iwl_mvm_send_bcast_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
			   struct iwl_mvm_int_sta *bsta)
{
	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
	static const u8 baddr[] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};

	lockdep_assert_held(&mvm->mutex);

	if (WARN_ON_ONCE(bsta->sta_id == IWL_MVM_STATION_COUNT))
		return -ENOSPC;

	return iwl_mvm_add_int_sta_common(mvm, bsta, baddr,
					  mvmvif->id, mvmvif->color);
}

/* Send the FW a request to remove the station from it's internal data
 * structures, but DO NOT remove the entry from the local data structures. */
int iwl_mvm_send_rm_bcast_sta(struct iwl_mvm *mvm,
			      struct iwl_mvm_int_sta *bsta)
{
	int ret;

	lockdep_assert_held(&mvm->mutex);

	ret = iwl_mvm_rm_sta_common(mvm, bsta->sta_id);
	if (ret)
		IWL_WARN(mvm, "Failed sending remove station\n");
	return ret;
}

/* Allocate a new station entry for the broadcast station to the given vif,
 * and send it to the FW.
 * Note that each P2P mac should have its own broadcast station.
 *
 * @mvm: the mvm component
 * @vif: the interface to which the broadcast station is added
 * @bsta: the broadcast station to add. */
int iwl_mvm_add_bcast_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
			  struct iwl_mvm_int_sta *bsta)
{
	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
	static const u8 baddr[] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
	u32 qmask;
	int ret;

	lockdep_assert_held(&mvm->mutex);

	qmask = iwl_mvm_mac_get_queues_mask(mvm, vif);
	ret = iwl_mvm_allocate_int_sta(mvm, bsta, qmask);
	if (ret)
		return ret;

	ret = iwl_mvm_add_int_sta_common(mvm, bsta, baddr,
					 mvmvif->id, mvmvif->color);

	if (ret)
		iwl_mvm_dealloc_int_sta(mvm, bsta);
	return ret;
}

/*
 * Send the FW a request to remove the station from it's internal data
 * structures, and in addition remove it from the local data structure.
 */
int iwl_mvm_rm_bcast_sta(struct iwl_mvm *mvm, struct iwl_mvm_int_sta *bsta)
{
	int ret;

	lockdep_assert_held(&mvm->mutex);

	ret = iwl_mvm_rm_sta_common(mvm, bsta->sta_id);
	if (ret)
		return ret;

	iwl_mvm_dealloc_int_sta(mvm, bsta);
	return ret;
}

int iwl_mvm_sta_rx_agg(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
		       int tid, u16 ssn, bool start)
{
	struct iwl_mvm_sta *mvm_sta = (void *)sta->drv_priv;
	struct iwl_mvm_add_sta_cmd cmd = {};
	int ret;
	u32 status;

	lockdep_assert_held(&mvm->mutex);

	cmd.mac_id_n_color = cpu_to_le32(mvm_sta->mac_id_n_color);
	cmd.sta_id = mvm_sta->sta_id;
	cmd.add_modify = STA_MODE_MODIFY;
	cmd.add_immediate_ba_tid = (u8) tid;
	cmd.add_immediate_ba_ssn = cpu_to_le16(ssn);
	cmd.modify_mask = start ? STA_MODIFY_ADD_BA_TID :
				  STA_MODIFY_REMOVE_BA_TID;

	status = ADD_STA_SUCCESS;
	ret = iwl_mvm_send_cmd_pdu_status(mvm, ADD_STA, sizeof(cmd),
					  &cmd, &status);
	if (ret)
		return ret;

	switch (status) {
	case ADD_STA_SUCCESS:
		IWL_DEBUG_INFO(mvm, "RX BA Session %sed in fw\n",
			       start ? "start" : "stopp");
		break;
	case ADD_STA_IMMEDIATE_BA_FAILURE:
		IWL_WARN(mvm, "RX BA Session refused by fw\n");
		ret = -ENOSPC;
		break;
	default:
		ret = -EIO;
		IWL_ERR(mvm, "RX BA Session failed %sing, status 0x%x\n",
			start ? "start" : "stopp", status);
		break;
	}

	return ret;
}

static int iwl_mvm_sta_tx_agg(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
			      int tid, u8 queue, bool start)
{
	struct iwl_mvm_sta *mvm_sta = (void *)sta->drv_priv;
	struct iwl_mvm_add_sta_cmd cmd = {};
	int ret;
	u32 status;

	lockdep_assert_held(&mvm->mutex);

	if (start) {
		mvm_sta->tfd_queue_msk |= BIT(queue);
		mvm_sta->tid_disable_agg &= ~BIT(tid);
	} else {
		mvm_sta->tfd_queue_msk &= ~BIT(queue);
		mvm_sta->tid_disable_agg |= BIT(tid);
	}

	cmd.mac_id_n_color = cpu_to_le32(mvm_sta->mac_id_n_color);
	cmd.sta_id = mvm_sta->sta_id;
	cmd.add_modify = STA_MODE_MODIFY;
	cmd.modify_mask = STA_MODIFY_QUEUES | STA_MODIFY_TID_DISABLE_TX;
	cmd.tfd_queue_msk = cpu_to_le32(mvm_sta->tfd_queue_msk);
	cmd.tid_disable_tx = cpu_to_le16(mvm_sta->tid_disable_agg);

	status = ADD_STA_SUCCESS;
	ret = iwl_mvm_send_cmd_pdu_status(mvm, ADD_STA, sizeof(cmd),
					  &cmd, &status);
	if (ret)
		return ret;

	switch (status) {
	case ADD_STA_SUCCESS:
		break;
	default:
		ret = -EIO;
		IWL_ERR(mvm, "TX BA Session failed %sing, status 0x%x\n",
			start ? "start" : "stopp", status);
		break;
	}

	return ret;
}

static const u8 tid_to_ac[] = {
	IEEE80211_AC_BE,
	IEEE80211_AC_BK,
	IEEE80211_AC_BK,
	IEEE80211_AC_BE,
	IEEE80211_AC_VI,
	IEEE80211_AC_VI,
	IEEE80211_AC_VO,
	IEEE80211_AC_VO,
};

int iwl_mvm_sta_tx_agg_start(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
			     struct ieee80211_sta *sta, u16 tid, u16 *ssn)
{
	struct iwl_mvm_sta *mvmsta = (void *)sta->drv_priv;
	struct iwl_mvm_tid_data *tid_data;
	int txq_id;

	if (WARN_ON_ONCE(tid >= IWL_MAX_TID_COUNT))
		return -EINVAL;

	if (mvmsta->tid_data[tid].state != IWL_AGG_OFF) {
		IWL_ERR(mvm, "Start AGG when state is not IWL_AGG_OFF %d!\n",
			mvmsta->tid_data[tid].state);
		return -ENXIO;
	}

	lockdep_assert_held(&mvm->mutex);

	for (txq_id = IWL_MVM_FIRST_AGG_QUEUE;
	     txq_id <= IWL_MVM_LAST_AGG_QUEUE; txq_id++)
		if (mvm->queue_to_mac80211[txq_id] ==
		    IWL_INVALID_MAC80211_QUEUE)
			break;

	if (txq_id > IWL_MVM_LAST_AGG_QUEUE) {
		IWL_ERR(mvm, "Failed to allocate agg queue\n");
		return -EIO;
	}

	/* the new tx queue is still connected to the same mac80211 queue */
	mvm->queue_to_mac80211[txq_id] = vif->hw_queue[tid_to_ac[tid]];

	spin_lock_bh(&mvmsta->lock);
	tid_data = &mvmsta->tid_data[tid];
	tid_data->ssn = IEEE80211_SEQ_TO_SN(tid_data->seq_number);
	tid_data->txq_id = txq_id;
	*ssn = tid_data->ssn;

	IWL_DEBUG_TX_QUEUES(mvm,
			    "Start AGG: sta %d tid %d queue %d - ssn = %d, next_recl = %d\n",
			    mvmsta->sta_id, tid, txq_id, tid_data->ssn,
			    tid_data->next_reclaimed);

	if (tid_data->ssn == tid_data->next_reclaimed) {
		tid_data->state = IWL_AGG_STARTING;
		ieee80211_start_tx_ba_cb_irqsafe(vif, sta->addr, tid);
	} else {
		tid_data->state = IWL_EMPTYING_HW_QUEUE_ADDBA;
	}

	spin_unlock_bh(&mvmsta->lock);

	return 0;
}

int iwl_mvm_sta_tx_agg_oper(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
			    struct ieee80211_sta *sta, u16 tid, u8 buf_size)
{
	struct iwl_mvm_sta *mvmsta = (void *)sta->drv_priv;
	struct iwl_mvm_tid_data *tid_data = &mvmsta->tid_data[tid];
	int queue, fifo, ret;
	u16 ssn;

	buf_size = min_t(int, buf_size, LINK_QUAL_AGG_FRAME_LIMIT_DEF);

	spin_lock_bh(&mvmsta->lock);
	ssn = tid_data->ssn;
	queue = tid_data->txq_id;
	tid_data->state = IWL_AGG_ON;
	tid_data->ssn = 0xffff;
	spin_unlock_bh(&mvmsta->lock);

	fifo = iwl_mvm_ac_to_tx_fifo[tid_to_ac[tid]];

	ret = iwl_mvm_sta_tx_agg(mvm, sta, tid, queue, true);
	if (ret)
		return -EIO;

	iwl_trans_txq_enable(mvm->trans, queue, fifo, mvmsta->sta_id, tid,
			     buf_size, ssn);

	/*
	 * Even though in theory the peer could have different
	 * aggregation reorder buffer sizes for different sessions,
	 * our ucode doesn't allow for that and has a global limit
	 * for each station. Therefore, use the minimum of all the
	 * aggregation sessions and our default value.
	 */
	mvmsta->max_agg_bufsize =
		min(mvmsta->max_agg_bufsize, buf_size);
	mvmsta->lq_sta.lq.agg_frame_cnt_limit = mvmsta->max_agg_bufsize;

	if (mvm->cfg->ht_params->use_rts_for_aggregation) {
		/*
		 * switch to RTS/CTS if it is the prefer protection
		 * method for HT traffic
		 */
		mvmsta->lq_sta.lq.flags |= LQ_FLAG_SET_STA_TLC_RTS_MSK;
		/*
		 * TODO: remove the TLC_RTS flag when we tear down the last
		 * AGG session (agg_tids_count in DVM)
		 */
	}

	IWL_DEBUG_HT(mvm, "Tx aggregation enabled on ra = %pM tid = %d\n",
		     sta->addr, tid);

	return iwl_mvm_send_lq_cmd(mvm, &mvmsta->lq_sta.lq, CMD_ASYNC, false);
}

int iwl_mvm_sta_tx_agg_stop(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
			    struct ieee80211_sta *sta, u16 tid)
{
	struct iwl_mvm_sta *mvmsta = (void *)sta->drv_priv;
	struct iwl_mvm_tid_data *tid_data = &mvmsta->tid_data[tid];
	u16 txq_id;
	int err;


	/*
	 * If mac80211 is cleaning its state, then say that we finished since
	 * our state has been cleared anyway.
	 */
	if (test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status)) {
		ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid);
		return 0;
	}

	spin_lock_bh(&mvmsta->lock);

	txq_id = tid_data->txq_id;

	IWL_DEBUG_TX_QUEUES(mvm, "Stop AGG: sta %d tid %d q %d state %d\n",
			    mvmsta->sta_id, tid, txq_id, tid_data->state);

	switch (tid_data->state) {
	case IWL_AGG_ON:
		tid_data->ssn = IEEE80211_SEQ_TO_SN(tid_data->seq_number);

		IWL_DEBUG_TX_QUEUES(mvm,
				    "ssn = %d, next_recl = %d\n",
				    tid_data->ssn, tid_data->next_reclaimed);

		/* There are still packets for this RA / TID in the HW */
		if (tid_data->ssn != tid_data->next_reclaimed) {
			tid_data->state = IWL_EMPTYING_HW_QUEUE_DELBA;
			err = 0;
			break;
		}

		tid_data->ssn = 0xffff;
		iwl_trans_txq_disable(mvm->trans, txq_id);
		/* fall through */
	case IWL_AGG_STARTING:
	case IWL_EMPTYING_HW_QUEUE_ADDBA:
		/*
		 * The agg session has been stopped before it was set up. This
		 * can happen when the AddBA timer times out for example.
		 */

		/* No barriers since we are under mutex */
		lockdep_assert_held(&mvm->mutex);
		mvm->queue_to_mac80211[txq_id] = IWL_INVALID_MAC80211_QUEUE;

		ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid);
		tid_data->state = IWL_AGG_OFF;
		err = 0;
		break;
	default:
		IWL_ERR(mvm,
			"Stopping AGG while state not ON or starting for %d on %d (%d)\n",
			mvmsta->sta_id, tid, tid_data->state);
		IWL_ERR(mvm,
			"\ttid_data->txq_id = %d\n", tid_data->txq_id);
		err = -EINVAL;
	}

	spin_unlock_bh(&mvmsta->lock);

	return err;
}

int iwl_mvm_sta_tx_agg_flush(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
			    struct ieee80211_sta *sta, u16 tid)
{
	struct iwl_mvm_sta *mvmsta = (void *)sta->drv_priv;
	struct iwl_mvm_tid_data *tid_data = &mvmsta->tid_data[tid];
	u16 txq_id;

	/*
	 * First set the agg state to OFF to avoid calling
	 * ieee80211_stop_tx_ba_cb in iwl_mvm_check_ratid_empty.
	 */
	spin_lock_bh(&mvmsta->lock);
	txq_id = tid_data->txq_id;
	IWL_DEBUG_TX_QUEUES(mvm, "Flush AGG: sta %d tid %d q %d state %d\n",
			    mvmsta->sta_id, tid, txq_id, tid_data->state);
	tid_data->state = IWL_AGG_OFF;
	spin_unlock_bh(&mvmsta->lock);

	if (iwl_mvm_flush_tx_path(mvm, BIT(txq_id), true))
		IWL_ERR(mvm, "Couldn't flush the AGG queue\n");

	iwl_trans_txq_disable(mvm->trans, tid_data->txq_id);
	mvm->queue_to_mac80211[tid_data->txq_id] =
				IWL_INVALID_MAC80211_QUEUE;

	return 0;
}

static int iwl_mvm_set_fw_key_idx(struct iwl_mvm *mvm)
{
	int i;

	lockdep_assert_held(&mvm->mutex);

	i = find_first_zero_bit(mvm->fw_key_table, STA_KEY_MAX_NUM);

	if (i == STA_KEY_MAX_NUM)
		return STA_KEY_IDX_INVALID;

	__set_bit(i, mvm->fw_key_table);

	return i;
}

static u8 iwl_mvm_get_key_sta_id(struct ieee80211_vif *vif,
				 struct ieee80211_sta *sta)
{
	struct iwl_mvm_vif *mvmvif = (void *)vif->drv_priv;

	if (sta) {
		struct iwl_mvm_sta *mvm_sta = (void *)sta->drv_priv;

		return mvm_sta->sta_id;
	}

	/*
	 * The device expects GTKs for station interfaces to be
	 * installed as GTKs for the AP station. If we have no
	 * station ID, then use AP's station ID.
	 */
	if (vif->type == NL80211_IFTYPE_STATION &&
	    mvmvif->ap_sta_id != IWL_MVM_STATION_COUNT)
		return mvmvif->ap_sta_id;

	return IWL_MVM_STATION_COUNT;
}

static int iwl_mvm_send_sta_key(struct iwl_mvm *mvm,
				struct iwl_mvm_sta *mvm_sta,
				struct ieee80211_key_conf *keyconf,
				u8 sta_id, u32 tkip_iv32, u16 *tkip_p1k,
				u32 cmd_flags)
{
	__le16 key_flags;
	struct iwl_mvm_add_sta_cmd cmd = {};
	int ret, status;
	u16 keyidx;
	int i;

	keyidx = (keyconf->keyidx << STA_KEY_FLG_KEYID_POS) &
		 STA_KEY_FLG_KEYID_MSK;
	key_flags = cpu_to_le16(keyidx);
	key_flags |= cpu_to_le16(STA_KEY_FLG_WEP_KEY_MAP);

	switch (keyconf->cipher) {
	case WLAN_CIPHER_SUITE_TKIP:
		key_flags |= cpu_to_le16(STA_KEY_FLG_TKIP);
		cmd.key.tkip_rx_tsc_byte2 = tkip_iv32;
		for (i = 0; i < 5; i++)
			cmd.key.tkip_rx_ttak[i] = cpu_to_le16(tkip_p1k[i]);
		memcpy(cmd.key.key, keyconf->key, keyconf->keylen);
		break;
	case WLAN_CIPHER_SUITE_CCMP:
		key_flags |= cpu_to_le16(STA_KEY_FLG_CCM);
		memcpy(cmd.key.key, keyconf->key, keyconf->keylen);
		break;
	default:
		WARN_ON(1);
		return -EINVAL;
	}

	if (!(keyconf->flags & IEEE80211_KEY_FLAG_PAIRWISE))
		key_flags |= cpu_to_le16(STA_KEY_MULTICAST);

	cmd.mac_id_n_color = cpu_to_le32(mvm_sta->mac_id_n_color);
	cmd.key.key_offset = keyconf->hw_key_idx;
	cmd.key.key_flags = key_flags;
	cmd.add_modify = STA_MODE_MODIFY;
	cmd.modify_mask = STA_MODIFY_KEY;
	cmd.sta_id = sta_id;

	status = ADD_STA_SUCCESS;
	if (cmd_flags == CMD_SYNC)
		ret = iwl_mvm_send_cmd_pdu_status(mvm, ADD_STA, sizeof(cmd),
						  &cmd, &status);
	else
		ret = iwl_mvm_send_cmd_pdu(mvm, ADD_STA, CMD_ASYNC,
					   sizeof(cmd), &cmd);

	switch (status) {
	case ADD_STA_SUCCESS:
		IWL_DEBUG_WEP(mvm, "MODIFY_STA: set dynamic key passed\n");
		break;
	default:
		ret = -EIO;
		IWL_ERR(mvm, "MODIFY_STA: set dynamic key failed\n");
		break;
	}

	return ret;
}

static int iwl_mvm_send_sta_igtk(struct iwl_mvm *mvm,
				 struct ieee80211_key_conf *keyconf,
				 u8 sta_id, bool remove_key)
{
	struct iwl_mvm_mgmt_mcast_key_cmd igtk_cmd = {};

	/* verify the key details match the required command's expectations */
	if (WARN_ON((keyconf->cipher != WLAN_CIPHER_SUITE_AES_CMAC) ||
		    (keyconf->flags & IEEE80211_KEY_FLAG_PAIRWISE) ||
		    (keyconf->keyidx != 4 && keyconf->keyidx != 5)))
		return -EINVAL;

	igtk_cmd.key_id = cpu_to_le32(keyconf->keyidx);
	igtk_cmd.sta_id = cpu_to_le32(sta_id);

	if (remove_key) {
		igtk_cmd.ctrl_flags |= cpu_to_le32(STA_KEY_NOT_VALID);
	} else {
		struct ieee80211_key_seq seq;
		const u8 *pn;

		memcpy(igtk_cmd.IGTK, keyconf->key, keyconf->keylen);
		ieee80211_aes_cmac_calculate_k1_k2(keyconf,
						   igtk_cmd.K1, igtk_cmd.K2);
		ieee80211_get_key_rx_seq(keyconf, 0, &seq);
		pn = seq.aes_cmac.pn;
		igtk_cmd.receive_seq_cnt = cpu_to_le64(((u64) pn[5] << 0) |
						       ((u64) pn[4] << 8) |
						       ((u64) pn[3] << 16) |
						       ((u64) pn[2] << 24) |
						       ((u64) pn[1] << 32) |
						       ((u64) pn[0] << 40));
	}

	IWL_DEBUG_INFO(mvm, "%s igtk for sta %u\n",
		       remove_key ? "removing" : "installing",
		       igtk_cmd.sta_id);

	return iwl_mvm_send_cmd_pdu(mvm, MGMT_MCAST_KEY, CMD_SYNC,
				    sizeof(igtk_cmd), &igtk_cmd);
}


static inline u8 *iwl_mvm_get_mac_addr(struct iwl_mvm *mvm,
				       struct ieee80211_vif *vif,
				       struct ieee80211_sta *sta)
{
	struct iwl_mvm_vif *mvmvif = (void *)vif->drv_priv;

	if (sta)
		return sta->addr;

	if (vif->type == NL80211_IFTYPE_STATION &&
	    mvmvif->ap_sta_id != IWL_MVM_STATION_COUNT) {
		u8 sta_id = mvmvif->ap_sta_id;
		sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[sta_id],
						lockdep_is_held(&mvm->mutex));
		return sta->addr;
	}


	return NULL;
}

int iwl_mvm_set_sta_key(struct iwl_mvm *mvm,
			struct ieee80211_vif *vif,
			struct ieee80211_sta *sta,
			struct ieee80211_key_conf *keyconf,
			bool have_key_offset)
{
	struct iwl_mvm_sta *mvm_sta;
	int ret;
	u8 *addr, sta_id;
	struct ieee80211_key_seq seq;
	u16 p1k[5];

	lockdep_assert_held(&mvm->mutex);

	/* Get the station id from the mvm local station table */
	sta_id = iwl_mvm_get_key_sta_id(vif, sta);
	if (sta_id == IWL_MVM_STATION_COUNT) {
		IWL_ERR(mvm, "Failed to find station id\n");
		return -EINVAL;
	}

	if (keyconf->cipher == WLAN_CIPHER_SUITE_AES_CMAC) {
		ret = iwl_mvm_send_sta_igtk(mvm, keyconf, sta_id, false);
		goto end;
	}

	/*
	 * It is possible that the 'sta' parameter is NULL, and thus
	 * there is a need to retrieve  the sta from the local station table.
	 */
	if (!sta) {
		sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[sta_id],
						lockdep_is_held(&mvm->mutex));
		if (IS_ERR_OR_NULL(sta)) {
			IWL_ERR(mvm, "Invalid station id\n");
			return -EINVAL;
		}
	}

	mvm_sta = (struct iwl_mvm_sta *)sta->drv_priv;
	if (WARN_ON_ONCE(mvm_sta->vif != vif))
		return -EINVAL;

	if (!have_key_offset) {
		/*
		 * The D3 firmware hardcodes the PTK offset to 0, so we have to
		 * configure it there. As a result, this workaround exists to
		 * let the caller set the key offset (hw_key_idx), see d3.c.
		 */
		keyconf->hw_key_idx = iwl_mvm_set_fw_key_idx(mvm);
		if (keyconf->hw_key_idx == STA_KEY_IDX_INVALID)
			return -ENOSPC;
	}

	switch (keyconf->cipher) {
	case WLAN_CIPHER_SUITE_TKIP:
		addr = iwl_mvm_get_mac_addr(mvm, vif, sta);
		/* get phase 1 key from mac80211 */
		ieee80211_get_key_rx_seq(keyconf, 0, &seq);
		ieee80211_get_tkip_rx_p1k(keyconf, addr, seq.tkip.iv32, p1k);
		ret = iwl_mvm_send_sta_key(mvm, mvm_sta, keyconf, sta_id,
					   seq.tkip.iv32, p1k, CMD_SYNC);
		break;
	case WLAN_CIPHER_SUITE_CCMP:
		ret = iwl_mvm_send_sta_key(mvm, mvm_sta, keyconf, sta_id,
					   0, NULL, CMD_SYNC);
		break;
	default:
		IWL_ERR(mvm, "Unknown cipher %x\n", keyconf->cipher);
		ret = -EINVAL;
	}

	if (ret)
		__clear_bit(keyconf->hw_key_idx, mvm->fw_key_table);

end:
	IWL_DEBUG_WEP(mvm, "key: cipher=%x len=%d idx=%d sta=%pM ret=%d\n",
		      keyconf->cipher, keyconf->keylen, keyconf->keyidx,
		      sta->addr, ret);
	return ret;
}

int iwl_mvm_remove_sta_key(struct iwl_mvm *mvm,
			   struct ieee80211_vif *vif,
			   struct ieee80211_sta *sta,
			   struct ieee80211_key_conf *keyconf)
{
	struct iwl_mvm_sta *mvm_sta;
	struct iwl_mvm_add_sta_cmd cmd = {};
	__le16 key_flags;
	int ret, status;
	u8 sta_id;

	lockdep_assert_held(&mvm->mutex);

	/* Get the station id from the mvm local station table */
	sta_id = iwl_mvm_get_key_sta_id(vif, sta);

	IWL_DEBUG_WEP(mvm, "mvm remove dynamic key: idx=%d sta=%d\n",
		      keyconf->keyidx, sta_id);

	if (keyconf->cipher == WLAN_CIPHER_SUITE_AES_CMAC)
		return iwl_mvm_send_sta_igtk(mvm, keyconf, sta_id, true);

	ret = __test_and_clear_bit(keyconf->hw_key_idx, mvm->fw_key_table);
	if (!ret) {
		IWL_ERR(mvm, "offset %d not used in fw key table.\n",
			keyconf->hw_key_idx);
		return -ENOENT;
	}

	if (sta_id == IWL_MVM_STATION_COUNT) {
		IWL_DEBUG_WEP(mvm, "station non-existent, early return.\n");
		return 0;
	}

	/*
	 * It is possible that the 'sta' parameter is NULL, and thus
	 * there is a need to retrieve the sta from the local station table,
	 * for example when a GTK is removed (where the sta_id will then be
	 * the AP ID, and no station was passed by mac80211.)
	 */
	if (!sta) {
		sta = rcu_dereference_protected(mvm->fw_id_to_mac_id[sta_id],
						lockdep_is_held(&mvm->mutex));
		if (!sta) {
			IWL_ERR(mvm, "Invalid station id\n");
			return -EINVAL;
		}
	}

	mvm_sta = (struct iwl_mvm_sta *)sta->drv_priv;
	if (WARN_ON_ONCE(mvm_sta->vif != vif))
		return -EINVAL;

	key_flags = cpu_to_le16((keyconf->keyidx << STA_KEY_FLG_KEYID_POS) &
				 STA_KEY_FLG_KEYID_MSK);
	key_flags |= cpu_to_le16(STA_KEY_FLG_NO_ENC | STA_KEY_FLG_WEP_KEY_MAP);
	key_flags |= cpu_to_le16(STA_KEY_NOT_VALID);

	if (!(keyconf->flags & IEEE80211_KEY_FLAG_PAIRWISE))
		key_flags |= cpu_to_le16(STA_KEY_MULTICAST);

	cmd.mac_id_n_color = cpu_to_le32(mvm_sta->mac_id_n_color);
	cmd.key.key_flags = key_flags;
	cmd.key.key_offset = keyconf->hw_key_idx;
	cmd.sta_id = sta_id;

	cmd.modify_mask = STA_MODIFY_KEY;
	cmd.add_modify = STA_MODE_MODIFY;

	status = ADD_STA_SUCCESS;
	ret = iwl_mvm_send_cmd_pdu_status(mvm, ADD_STA, sizeof(cmd),
					  &cmd, &status);

	switch (status) {
	case ADD_STA_SUCCESS:
		IWL_DEBUG_WEP(mvm, "MODIFY_STA: remove sta key passed\n");
		break;
	default:
		ret = -EIO;
		IWL_ERR(mvm, "MODIFY_STA: remove sta key failed\n");
		break;
	}

	return ret;
}

void iwl_mvm_update_tkip_key(struct iwl_mvm *mvm,
			     struct ieee80211_vif *vif,
			     struct ieee80211_key_conf *keyconf,
			     struct ieee80211_sta *sta, u32 iv32,
			     u16 *phase1key)
{
	struct iwl_mvm_sta *mvm_sta;
	u8 sta_id = iwl_mvm_get_key_sta_id(vif, sta);

	if (WARN_ON_ONCE(sta_id == IWL_MVM_STATION_COUNT))
		return;

	rcu_read_lock();

	if (!sta) {
		sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);
		if (WARN_ON(IS_ERR_OR_NULL(sta))) {
			rcu_read_unlock();
			return;
		}
	}

	mvm_sta = (void *)sta->drv_priv;
	iwl_mvm_send_sta_key(mvm, mvm_sta, keyconf, sta_id,
			     iv32, phase1key, CMD_ASYNC);
	rcu_read_unlock();
}

void iwl_mvm_sta_modify_ps_wake(struct iwl_mvm *mvm,
				struct ieee80211_sta *sta)
{
	struct iwl_mvm_sta *mvmsta = (void *)sta->drv_priv;
	struct iwl_mvm_add_sta_cmd cmd = {
		.add_modify = STA_MODE_MODIFY,
		.sta_id = mvmsta->sta_id,
		.modify_mask = STA_MODIFY_SLEEPING_STA_TX_COUNT,
		.sleep_state_flags = cpu_to_le16(STA_SLEEP_STATE_AWAKE),
		.mac_id_n_color = cpu_to_le32(mvmsta->mac_id_n_color),
	};
	int ret;

	/*
	 * Same modify mask for sleep_tx_count and sleep_state_flags but this
	 * should be fine since if we set the STA as "awake", then
	 * sleep_tx_count is not relevant.
	 */
	ret = iwl_mvm_send_cmd_pdu(mvm, ADD_STA, CMD_ASYNC, sizeof(cmd), &cmd);
	if (ret)
		IWL_ERR(mvm, "Failed to send ADD_STA command (%d)\n", ret);
}

void iwl_mvm_sta_modify_sleep_tx_count(struct iwl_mvm *mvm,
				       struct ieee80211_sta *sta,
				       enum ieee80211_frame_release_type reason,
				       u16 cnt)
{
	u16 sleep_state_flags =
		(reason == IEEE80211_FRAME_RELEASE_UAPSD) ?
			STA_SLEEP_STATE_UAPSD : STA_SLEEP_STATE_PS_POLL;
	struct iwl_mvm_sta *mvmsta = (void *)sta->drv_priv;
	struct iwl_mvm_add_sta_cmd cmd = {
		.add_modify = STA_MODE_MODIFY,
		.sta_id = mvmsta->sta_id,
		.modify_mask = STA_MODIFY_SLEEPING_STA_TX_COUNT,
		.sleep_tx_count = cpu_to_le16(cnt),
		.mac_id_n_color = cpu_to_le32(mvmsta->mac_id_n_color),
		/*
		 * Same modify mask for sleep_tx_count and sleep_state_flags so
		 * we must set the sleep_state_flags too.
		 */
		.sleep_state_flags = cpu_to_le16(sleep_state_flags),
	};
	int ret;

	/* TODO: somehow the fw doesn't seem to take PS_POLL into account */
	ret = iwl_mvm_send_cmd_pdu(mvm, ADD_STA, CMD_ASYNC, sizeof(cmd), &cmd);
	if (ret)
		IWL_ERR(mvm, "Failed to send ADD_STA command (%d)\n", ret);
}