summaryrefslogtreecommitdiff
path: root/drivers/net/wireless/intel/iwlwifi/mvm/mld-sta.c
blob: b7a461dba41ee3fe87a09f3ca10d5a1cdded0360 (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
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
// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
/*
 * Copyright (C) 2022-2024 Intel Corporation
 */
#include "mvm.h"
#include "time-sync.h"
#include "sta.h"

u32 iwl_mvm_sta_fw_id_mask(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
			   int filter_link_id)
{
	struct ieee80211_link_sta *link_sta;
	struct iwl_mvm_sta *mvmsta;
	struct ieee80211_vif *vif;
	unsigned int link_id;
	u32 result = 0;

	if (!sta)
		return 0;

	mvmsta = iwl_mvm_sta_from_mac80211(sta);
	vif = mvmsta->vif;

	/* it's easy when the STA is not an MLD */
	if (!sta->valid_links)
		return BIT(mvmsta->deflink.sta_id);

	/* but if it is an MLD, get the mask of all the FW STAs it has ... */
	for_each_sta_active_link(vif, sta, link_sta, link_id) {
		struct iwl_mvm_link_sta *mvm_link_sta;

		/* unless we have a specific link in mind */
		if (filter_link_id >= 0 && link_id != filter_link_id)
			continue;

		mvm_link_sta =
			rcu_dereference_check(mvmsta->link[link_id],
					      lockdep_is_held(&mvm->mutex));
		if (!mvm_link_sta)
			continue;

		result |= BIT(mvm_link_sta->sta_id);
	}

	return result;
}

static int iwl_mvm_mld_send_sta_cmd(struct iwl_mvm *mvm,
				    struct iwl_mvm_sta_cfg_cmd *cmd)
{
	int ret = iwl_mvm_send_cmd_pdu(mvm,
				       WIDE_ID(MAC_CONF_GROUP, STA_CONFIG_CMD),
				       0, sizeof(*cmd), cmd);
	if (ret)
		IWL_ERR(mvm, "STA_CONFIG_CMD send failed, ret=0x%x\n", ret);
	return ret;
}

/*
 * Add an internal station to the FW table
 */
static int iwl_mvm_mld_add_int_sta_to_fw(struct iwl_mvm *mvm,
					 struct iwl_mvm_int_sta *sta,
					 const u8 *addr, int link_id)
{
	struct iwl_mvm_sta_cfg_cmd cmd;

	lockdep_assert_held(&mvm->mutex);

	memset(&cmd, 0, sizeof(cmd));
	cmd.sta_id = cpu_to_le32((u8)sta->sta_id);

	cmd.link_id = cpu_to_le32(link_id);

	cmd.station_type = cpu_to_le32(sta->type);

	if (fw_has_capa(&mvm->fw->ucode_capa,
			IWL_UCODE_TLV_CAPA_STA_EXP_MFP_SUPPORT) &&
	    sta->type == STATION_TYPE_BCAST_MGMT)
		cmd.mfp = cpu_to_le32(1);

	if (addr) {
		memcpy(cmd.peer_mld_address, addr, ETH_ALEN);
		memcpy(cmd.peer_link_address, addr, ETH_ALEN);
	}

	return iwl_mvm_mld_send_sta_cmd(mvm, &cmd);
}

/*
 * 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_mld_rm_sta_from_fw(struct iwl_mvm *mvm, u32 sta_id)
{
	struct iwl_mvm_remove_sta_cmd rm_sta_cmd = {
		.sta_id = cpu_to_le32(sta_id),
	};
	int ret;

	/* Note: internal stations are marked as error values */
	if (!rcu_access_pointer(mvm->fw_id_to_mac_id[sta_id])) {
		IWL_ERR(mvm, "Invalid station id %d\n", sta_id);
		return -EINVAL;
	}

	ret = iwl_mvm_send_cmd_pdu(mvm, WIDE_ID(MAC_CONF_GROUP, STA_REMOVE_CMD),
				   0, 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;
}

static int iwl_mvm_add_aux_sta_to_fw(struct iwl_mvm *mvm,
				     struct iwl_mvm_int_sta *sta,
				     u32 lmac_id)
{
	int ret;

	struct iwl_mvm_aux_sta_cmd cmd = {
		.sta_id = cpu_to_le32(sta->sta_id),
		.lmac_id = cpu_to_le32(lmac_id),
	};

	ret = iwl_mvm_send_cmd_pdu(mvm, WIDE_ID(MAC_CONF_GROUP, AUX_STA_CMD),
				   0, sizeof(cmd), &cmd);
	if (ret)
		IWL_ERR(mvm, "Failed to send AUX_STA_CMD\n");
	return ret;
}

/*
 * Adds an internal sta to the FW table with its queues
 */
int iwl_mvm_mld_add_int_sta_with_queue(struct iwl_mvm *mvm,
				       struct iwl_mvm_int_sta *sta,
				       const u8 *addr, int link_id,
				       u16 *queue, u8 tid,
				       unsigned int *_wdg_timeout)
{
	int ret, txq;
	unsigned int wdg_timeout = _wdg_timeout ? *_wdg_timeout :
		mvm->trans->trans_cfg->base_params->wd_timeout;

	if (WARN_ON_ONCE(sta->sta_id == IWL_MVM_INVALID_STA))
		return -ENOSPC;

	if (sta->type == STATION_TYPE_AUX)
		ret = iwl_mvm_add_aux_sta_to_fw(mvm, sta, link_id);
	else
		ret = iwl_mvm_mld_add_int_sta_to_fw(mvm, sta, addr, link_id);
	if (ret)
		return ret;

	/*
	 * For 22000 firmware and on we cannot add queue to a station unknown
	 * to firmware so enable queue here - after the station was added
	 */
	txq = iwl_mvm_tvqm_enable_txq(mvm, NULL, sta->sta_id, tid,
				      wdg_timeout);
	if (txq < 0) {
		iwl_mvm_mld_rm_sta_from_fw(mvm, sta->sta_id);
		return txq;
	}
	*queue = txq;

	return 0;
}

/*
 * Adds a new int sta: allocate it in the driver, add it to the FW table,
 * and add its queues.
 */
static int iwl_mvm_mld_add_int_sta(struct iwl_mvm *mvm,
				   struct iwl_mvm_int_sta *int_sta, u16 *queue,
				   enum nl80211_iftype iftype,
				   enum iwl_fw_sta_type sta_type,
				   int link_id, const u8 *addr, u8 tid,
				   unsigned int *wdg_timeout)
{
	int ret;

	lockdep_assert_held(&mvm->mutex);

	/* qmask argument is not used in the new tx api, send a don't care */
	ret = iwl_mvm_allocate_int_sta(mvm, int_sta, 0, iftype,
				       sta_type);
	if (ret)
		return ret;

	ret = iwl_mvm_mld_add_int_sta_with_queue(mvm, int_sta, addr, link_id,
						 queue, tid, wdg_timeout);
	if (ret) {
		iwl_mvm_dealloc_int_sta(mvm, int_sta);
		return ret;
	}

	return 0;
}

/* 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.
 */
int iwl_mvm_mld_add_bcast_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
			      struct ieee80211_bss_conf *link_conf)
{
	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
	struct iwl_mvm_vif_link_info *mvm_link =
		mvmvif->link[link_conf->link_id];
	struct iwl_mvm_int_sta *bsta = &mvm_link->bcast_sta;
	static const u8 _baddr[] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
	const u8 *baddr = _baddr;
	unsigned int wdg_timeout =
		iwl_mvm_get_wd_timeout(mvm, vif, false, false);
	u16 *queue;

	lockdep_assert_held(&mvm->mutex);

	if (vif->type == NL80211_IFTYPE_ADHOC)
		baddr = link_conf->bssid;

	if (vif->type == NL80211_IFTYPE_AP ||
	    vif->type == NL80211_IFTYPE_ADHOC) {
		queue = &mvm_link->mgmt_queue;
	} else if (vif->type == NL80211_IFTYPE_P2P_DEVICE) {
		queue = &mvm->p2p_dev_queue;
	} else {
		WARN(1, "Missing required TXQ for adding bcast STA\n");
		return -EINVAL;
	}

	return iwl_mvm_mld_add_int_sta(mvm, bsta, queue,
				       ieee80211_vif_type_p2p(vif),
				       STATION_TYPE_BCAST_MGMT,
				       mvm_link->fw_link_id, baddr,
				       IWL_MAX_TID_COUNT, &wdg_timeout);
}

/* Allocate a new station entry for the broadcast station to the given vif,
 * and send it to the FW.
 * Note that each AP/GO mac should have its own multicast station.
 */
int iwl_mvm_mld_add_mcast_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
			      struct ieee80211_bss_conf *link_conf)
{
	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
	struct iwl_mvm_vif_link_info *mvm_link =
		mvmvif->link[link_conf->link_id];
	struct iwl_mvm_int_sta *msta = &mvm_link->mcast_sta;
	static const u8 _maddr[] = {0x03, 0x00, 0x00, 0x00, 0x00, 0x00};
	const u8 *maddr = _maddr;
	unsigned int timeout = iwl_mvm_get_wd_timeout(mvm, vif, false, false);

	lockdep_assert_held(&mvm->mutex);

	if (WARN_ON(vif->type != NL80211_IFTYPE_AP &&
		    vif->type != NL80211_IFTYPE_ADHOC))
		return -EOPNOTSUPP;

	/* In IBSS, ieee80211_check_queues() sets the cab_queue to be
	 * invalid, so make sure we use the queue we want.
	 * Note that this is done here as we want to avoid making DQA
	 * changes in mac80211 layer.
	 */
	if (vif->type == NL80211_IFTYPE_ADHOC)
		mvm_link->cab_queue = IWL_MVM_DQA_GCAST_QUEUE;

	return iwl_mvm_mld_add_int_sta(mvm, msta, &mvm_link->cab_queue,
				       vif->type, STATION_TYPE_MCAST,
				       mvm_link->fw_link_id, maddr, 0,
				       &timeout);
}

/* Allocate a new station entry for the sniffer station to the given vif,
 * and send it to the FW.
 */
int iwl_mvm_mld_add_snif_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
			     struct ieee80211_bss_conf *link_conf)
{
	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
	struct iwl_mvm_vif_link_info *mvm_link =
		mvmvif->link[link_conf->link_id];

	lockdep_assert_held(&mvm->mutex);

	return iwl_mvm_mld_add_int_sta(mvm, &mvm->snif_sta, &mvm->snif_queue,
				       vif->type, STATION_TYPE_BCAST_MGMT,
				       mvm_link->fw_link_id, NULL,
				       IWL_MAX_TID_COUNT, NULL);
}

int iwl_mvm_mld_add_aux_sta(struct iwl_mvm *mvm, u32 lmac_id)
{
	lockdep_assert_held(&mvm->mutex);

	/* In CDB NICs we need to specify which lmac to use for aux activity;
	 * use the link_id argument place to send lmac_id to the function.
	 */
	return iwl_mvm_mld_add_int_sta(mvm, &mvm->aux_sta, &mvm->aux_queue,
				       NL80211_IFTYPE_UNSPECIFIED,
				       STATION_TYPE_AUX, lmac_id, NULL,
				       IWL_MAX_TID_COUNT, NULL);
}

static int iwl_mvm_mld_disable_txq(struct iwl_mvm *mvm, u32 sta_mask,
				   u16 *queueptr, u8 tid)
{
	int queue = *queueptr;
	int ret = 0;

	if (tid == IWL_MAX_TID_COUNT)
		tid = IWL_MGMT_TID;

	if (mvm->sta_remove_requires_queue_remove) {
		u32 cmd_id = WIDE_ID(DATA_PATH_GROUP,
				     SCD_QUEUE_CONFIG_CMD);
		struct iwl_scd_queue_cfg_cmd remove_cmd = {
			.operation = cpu_to_le32(IWL_SCD_QUEUE_REMOVE),
			.u.remove.tid = cpu_to_le32(tid),
			.u.remove.sta_mask = cpu_to_le32(sta_mask),
		};

		ret = iwl_mvm_send_cmd_pdu(mvm, cmd_id, 0,
					   sizeof(remove_cmd),
					   &remove_cmd);
	}

	iwl_trans_txq_free(mvm->trans, queue);
	*queueptr = IWL_MVM_INVALID_QUEUE;

	return ret;
}

/* Removes a sta from the FW table, disable its queues, and dealloc it
 */
static int iwl_mvm_mld_rm_int_sta(struct iwl_mvm *mvm,
				  struct iwl_mvm_int_sta *int_sta,
				  bool flush, u8 tid, u16 *queuptr)
{
	int ret;

	lockdep_assert_held(&mvm->mutex);

	if (WARN_ON_ONCE(int_sta->sta_id == IWL_MVM_INVALID_STA))
		return -EINVAL;

	if (flush)
		iwl_mvm_flush_sta(mvm, int_sta->sta_id, int_sta->tfd_queue_msk);

	iwl_mvm_mld_disable_txq(mvm, BIT(int_sta->sta_id), queuptr, tid);

	ret = iwl_mvm_mld_rm_sta_from_fw(mvm, int_sta->sta_id);
	if (ret)
		IWL_WARN(mvm, "Failed sending remove station\n");

	iwl_mvm_dealloc_int_sta(mvm, int_sta);

	return ret;
}

int iwl_mvm_mld_rm_bcast_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
			     struct ieee80211_bss_conf *link_conf)
{
	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
	struct iwl_mvm_vif_link_info *link = mvmvif->link[link_conf->link_id];
	u16 *queueptr;

	lockdep_assert_held(&mvm->mutex);

	if (WARN_ON(!link))
		return -EIO;

	switch (vif->type) {
	case NL80211_IFTYPE_AP:
	case NL80211_IFTYPE_ADHOC:
		queueptr = &link->mgmt_queue;
		break;
	case NL80211_IFTYPE_P2P_DEVICE:
		queueptr = &mvm->p2p_dev_queue;
		break;
	default:
		WARN(1, "Can't free bcast queue on vif type %d\n",
		     vif->type);
		return -EINVAL;
	}

	return iwl_mvm_mld_rm_int_sta(mvm, &link->bcast_sta,
				      true, IWL_MAX_TID_COUNT, queueptr);
}

/* 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_mld_rm_mcast_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
			     struct ieee80211_bss_conf *link_conf)
{
	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
	struct iwl_mvm_vif_link_info *link = mvmvif->link[link_conf->link_id];

	lockdep_assert_held(&mvm->mutex);

	if (WARN_ON(!link))
		return -EIO;

	return iwl_mvm_mld_rm_int_sta(mvm, &link->mcast_sta, true, 0,
				      &link->cab_queue);
}

int iwl_mvm_mld_rm_snif_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
{
	lockdep_assert_held(&mvm->mutex);

	return iwl_mvm_mld_rm_int_sta(mvm, &mvm->snif_sta, false,
				      IWL_MAX_TID_COUNT, &mvm->snif_queue);
}

int iwl_mvm_mld_rm_aux_sta(struct iwl_mvm *mvm)
{
	lockdep_assert_held(&mvm->mutex);

	return iwl_mvm_mld_rm_int_sta(mvm, &mvm->aux_sta, false,
				      IWL_MAX_TID_COUNT, &mvm->aux_queue);
}

/* send a cfg sta command to add/update a sta in firmware */
static int iwl_mvm_mld_cfg_sta(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
			       struct ieee80211_vif *vif,
			       struct ieee80211_link_sta *link_sta,
			       struct ieee80211_bss_conf *link_conf,
			       struct iwl_mvm_link_sta *mvm_link_sta)
{
	struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
	struct iwl_mvm_vif *mvm_vif = iwl_mvm_vif_from_mac80211(vif);
	struct iwl_mvm_vif_link_info *link_info =
					mvm_vif->link[link_conf->link_id];
	struct iwl_mvm_sta_cfg_cmd cmd = {
		.sta_id = cpu_to_le32(mvm_link_sta->sta_id),
		.station_type = cpu_to_le32(mvm_sta->sta_type),
	};
	u32 agg_size = 0, mpdu_dens = 0;

	/* when adding sta, link should exist in FW */
	if (WARN_ON(link_info->fw_link_id == IWL_MVM_FW_LINK_ID_INVALID))
		return -EINVAL;

	cmd.link_id = cpu_to_le32(link_info->fw_link_id);

	memcpy(&cmd.peer_mld_address, sta->addr, ETH_ALEN);
	memcpy(&cmd.peer_link_address, link_sta->addr, ETH_ALEN);

	if (mvm_sta->sta_state >= IEEE80211_STA_ASSOC)
		cmd.assoc_id = cpu_to_le32(sta->aid);

	if (fw_has_capa(&mvm->fw->ucode_capa,
			IWL_UCODE_TLV_CAPA_STA_EXP_MFP_SUPPORT) &&
	    (sta->mfp || mvm_sta->sta_state < IEEE80211_STA_AUTHORIZED))
		cmd.mfp = cpu_to_le32(1);

	switch (link_sta->rx_nss) {
	case 1:
		cmd.mimo = cpu_to_le32(0);
		break;
	case 2 ... 8:
		cmd.mimo = cpu_to_le32(1);
		break;
	}

	switch (sta->deflink.smps_mode) {
	case IEEE80211_SMPS_AUTOMATIC:
	case IEEE80211_SMPS_NUM_MODES:
		WARN_ON(1);
		break;
	case IEEE80211_SMPS_STATIC:
		/* override NSS */
		cmd.mimo = cpu_to_le32(0);
		break;
	case IEEE80211_SMPS_DYNAMIC:
		cmd.mimo_protection = cpu_to_le32(1);
		break;
	case IEEE80211_SMPS_OFF:
		/* nothing */
		break;
	}

	mpdu_dens = iwl_mvm_get_sta_ampdu_dens(link_sta, link_conf, &agg_size);
	cmd.tx_ampdu_spacing = cpu_to_le32(mpdu_dens);
	cmd.tx_ampdu_max_size = cpu_to_le32(agg_size);

	if (sta->wme) {
		cmd.sp_length =
			cpu_to_le32(sta->max_sp ? sta->max_sp * 2 : 128);
		cmd.uapsd_acs = cpu_to_le32(iwl_mvm_get_sta_uapsd_acs(sta));
	}

	if (link_sta->he_cap.has_he) {
		cmd.trig_rnd_alloc =
			cpu_to_le32(link_conf->uora_exists ? 1 : 0);

		/* PPE Thresholds */
		iwl_mvm_set_sta_pkt_ext(mvm, link_sta, &cmd.pkt_ext);

		/* HTC flags */
		cmd.htc_flags = iwl_mvm_get_sta_htc_flags(sta, link_sta);

		if (link_sta->he_cap.he_cap_elem.mac_cap_info[2] &
		    IEEE80211_HE_MAC_CAP2_ACK_EN)
			cmd.ack_enabled = cpu_to_le32(1);
	}

	return iwl_mvm_mld_send_sta_cmd(mvm, &cmd);
}

static void iwl_mvm_mld_free_sta_link(struct iwl_mvm *mvm,
				      struct iwl_mvm_sta *mvm_sta,
				      struct iwl_mvm_link_sta *mvm_sta_link,
				      unsigned int link_id,
				      bool is_in_fw)
{
	RCU_INIT_POINTER(mvm->fw_id_to_mac_id[mvm_sta_link->sta_id],
			 is_in_fw ? ERR_PTR(-EINVAL) : NULL);
	RCU_INIT_POINTER(mvm->fw_id_to_link_sta[mvm_sta_link->sta_id], NULL);
	RCU_INIT_POINTER(mvm_sta->link[link_id], NULL);

	if (mvm_sta_link != &mvm_sta->deflink)
		kfree_rcu(mvm_sta_link, rcu_head);
}

static void iwl_mvm_mld_sta_rm_all_sta_links(struct iwl_mvm *mvm,
					     struct iwl_mvm_sta *mvm_sta)
{
	unsigned int link_id;

	for (link_id = 0; link_id < ARRAY_SIZE(mvm_sta->link); link_id++) {
		struct iwl_mvm_link_sta *link =
			rcu_dereference_protected(mvm_sta->link[link_id],
						  lockdep_is_held(&mvm->mutex));

		if (!link)
			continue;

		iwl_mvm_mld_free_sta_link(mvm, mvm_sta, link, link_id, false);
	}
}

static int iwl_mvm_mld_alloc_sta_link(struct iwl_mvm *mvm,
				      struct ieee80211_vif *vif,
				      struct ieee80211_sta *sta,
				      unsigned int link_id)
{
	struct ieee80211_link_sta *link_sta =
		link_sta_dereference_protected(sta, link_id);
	struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
	struct iwl_mvm_link_sta *link;
	u32 sta_id = iwl_mvm_find_free_sta_id(mvm,
					  ieee80211_vif_type_p2p(vif));

	if (sta_id == IWL_MVM_INVALID_STA)
		return -ENOSPC;

	if (rcu_access_pointer(sta->link[link_id]) == &sta->deflink) {
		link = &mvm_sta->deflink;
	} else {
		link = kzalloc(sizeof(*link), GFP_KERNEL);
		if (!link)
			return -ENOMEM;
	}

	link->sta_id = sta_id;
	rcu_assign_pointer(mvm_sta->link[link_id], link);
	rcu_assign_pointer(mvm->fw_id_to_mac_id[link->sta_id], sta);
	rcu_assign_pointer(mvm->fw_id_to_link_sta[link->sta_id],
			   link_sta);

	return 0;
}

/* allocate all the links of a sta, called when the station is first added */
static int iwl_mvm_mld_alloc_sta_links(struct iwl_mvm *mvm,
				       struct ieee80211_vif *vif,
				       struct ieee80211_sta *sta)
{
	struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
	struct ieee80211_link_sta *link_sta;
	unsigned int link_id;
	int ret;

	lockdep_assert_held(&mvm->mutex);

	for_each_sta_active_link(vif, sta, link_sta, link_id) {
		if (WARN_ON(mvm_sta->link[link_id]))
			continue;

		ret = iwl_mvm_mld_alloc_sta_link(mvm, vif, sta, link_id);
		if (ret)
			goto err;
	}

	return 0;

err:
	iwl_mvm_mld_sta_rm_all_sta_links(mvm, mvm_sta);
	return ret;
}

static void iwl_mvm_mld_set_ap_sta_id(struct ieee80211_sta *sta,
				      struct iwl_mvm_vif_link_info *vif_link,
				      struct iwl_mvm_link_sta *sta_link)
{
	if (!sta->tdls) {
		WARN_ON(vif_link->ap_sta_id != IWL_MVM_INVALID_STA);
		vif_link->ap_sta_id = sta_link->sta_id;
	} else {
		WARN_ON(vif_link->ap_sta_id == IWL_MVM_INVALID_STA);
	}
}

static int iwl_mvm_alloc_sta_after_restart(struct iwl_mvm *mvm,
					   struct ieee80211_vif *vif,
					   struct ieee80211_sta *sta)
{
	struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
	struct ieee80211_link_sta *link_sta;
	unsigned int link_id;
	/* no active link found */
	int ret = -EINVAL;
	int sta_id;

	/* First add an empty station since allocating a queue requires
	 * a valid station. Since we need a link_id to allocate a station,
	 * pick up the first valid one.
	 */
	for_each_sta_active_link(vif, sta, link_sta, link_id) {
		struct iwl_mvm_vif_link_info *mvm_link;
		struct ieee80211_bss_conf *link_conf =
			link_conf_dereference_protected(vif, link_id);
		struct iwl_mvm_link_sta *mvm_link_sta =
			rcu_dereference_protected(mvm_sta->link[link_id],
						  lockdep_is_held(&mvm->mutex));

		if (!link_conf)
			continue;

		mvm_link = mvmvif->link[link_conf->link_id];

		if (!mvm_link || !mvm_link_sta)
			continue;

		sta_id = mvm_link_sta->sta_id;
		ret = iwl_mvm_mld_cfg_sta(mvm, sta, vif, link_sta,
					  link_conf, mvm_link_sta);
		if (ret)
			return ret;

		rcu_assign_pointer(mvm->fw_id_to_mac_id[sta_id], sta);
		rcu_assign_pointer(mvm->fw_id_to_link_sta[sta_id], link_sta);
		ret = 0;
	}

	iwl_mvm_realloc_queues_after_restart(mvm, sta);

	return ret;
}

int iwl_mvm_mld_add_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
			struct ieee80211_sta *sta)
{
	struct iwl_mvm_vif *mvm_vif = iwl_mvm_vif_from_mac80211(vif);
	struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
	unsigned long link_sta_added_to_fw = 0;
	struct ieee80211_link_sta *link_sta;
	int ret = 0;
	unsigned int link_id;

	lockdep_assert_held(&mvm->mutex);

	if (!test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status)) {
		ret = iwl_mvm_mld_alloc_sta_links(mvm, vif, sta);
		if (ret)
			return ret;

		spin_lock_init(&mvm_sta->lock);

		ret = iwl_mvm_sta_init(mvm, vif, sta, IWL_MVM_INVALID_STA,
				       STATION_TYPE_PEER);
	} else {
		ret = iwl_mvm_alloc_sta_after_restart(mvm, vif, sta);
	}

	if (ret)
		goto err;

	/* at this stage sta link pointers are already allocated */
	ret = iwl_mvm_mld_update_sta(mvm, vif, sta);
	if (ret)
		goto err;

	for_each_sta_active_link(vif, sta, link_sta, link_id) {
		struct ieee80211_bss_conf *link_conf =
			link_conf_dereference_protected(vif, link_id);
		struct iwl_mvm_link_sta *mvm_link_sta =
			rcu_dereference_protected(mvm_sta->link[link_id],
						  lockdep_is_held(&mvm->mutex));

		if (WARN_ON(!link_conf || !mvm_link_sta)) {
			ret = -EINVAL;
			goto err;
		}

		ret = iwl_mvm_mld_cfg_sta(mvm, sta, vif, link_sta, link_conf,
					  mvm_link_sta);
		if (ret)
			goto err;

		link_sta_added_to_fw |= BIT(link_id);

		if (vif->type == NL80211_IFTYPE_STATION)
			iwl_mvm_mld_set_ap_sta_id(sta, mvm_vif->link[link_id],
						  mvm_link_sta);
	}
	return 0;

err:
	/* remove all already allocated stations in FW */
	for_each_set_bit(link_id, &link_sta_added_to_fw,
			 IEEE80211_MLD_MAX_NUM_LINKS) {
		struct iwl_mvm_link_sta *mvm_link_sta =
			rcu_dereference_protected(mvm_sta->link[link_id],
						  lockdep_is_held(&mvm->mutex));

		iwl_mvm_mld_rm_sta_from_fw(mvm, mvm_link_sta->sta_id);
	}

	/* free all sta resources in the driver */
	iwl_mvm_mld_sta_rm_all_sta_links(mvm, mvm_sta);
	return ret;
}

int iwl_mvm_mld_update_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
			   struct ieee80211_sta *sta)
{
	struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
	struct ieee80211_link_sta *link_sta;
	unsigned int link_id;
	int ret = -EINVAL;

	lockdep_assert_held(&mvm->mutex);

	for_each_sta_active_link(vif, sta, link_sta, link_id) {
		struct ieee80211_bss_conf *link_conf =
			link_conf_dereference_protected(vif, link_id);
		struct iwl_mvm_link_sta *mvm_link_sta =
			rcu_dereference_protected(mvm_sta->link[link_id],
						  lockdep_is_held(&mvm->mutex));

		if (WARN_ON(!link_conf || !mvm_link_sta))
			return -EINVAL;

		ret = iwl_mvm_mld_cfg_sta(mvm, sta, vif, link_sta, link_conf,
					  mvm_link_sta);

		if (ret) {
			IWL_ERR(mvm, "Failed to update sta link %d\n", link_id);
			break;
		}
	}

	return ret;
}

static void iwl_mvm_mld_disable_sta_queues(struct iwl_mvm *mvm,
					   struct ieee80211_vif *vif,
					   struct ieee80211_sta *sta)
{
	struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
	u32 sta_mask = iwl_mvm_sta_fw_id_mask(mvm, sta, -1);
	int i;

	lockdep_assert_held(&mvm->mutex);

	for (i = 0; i < ARRAY_SIZE(mvm_sta->tid_data); i++) {
		if (mvm_sta->tid_data[i].txq_id == IWL_MVM_INVALID_QUEUE)
			continue;

		iwl_mvm_mld_disable_txq(mvm, sta_mask,
					&mvm_sta->tid_data[i].txq_id, i);
		mvm_sta->tid_data[i].txq_id = IWL_MVM_INVALID_QUEUE;
	}

	for (i = 0; i < ARRAY_SIZE(sta->txq); i++) {
		struct iwl_mvm_txq *mvmtxq =
			iwl_mvm_txq_from_mac80211(sta->txq[i]);

		mvmtxq->txq_id = IWL_MVM_INVALID_QUEUE;
	}
}

int iwl_mvm_mld_rm_sta(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
		       struct ieee80211_sta *sta)
{
	struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
	struct ieee80211_link_sta *link_sta;
	unsigned int link_id;
	int ret;

	lockdep_assert_held(&mvm->mutex);

	/* flush its queues here since we are freeing mvm_sta */
	for_each_sta_active_link(vif, sta, link_sta, link_id) {
		struct iwl_mvm_link_sta *mvm_link_sta =
			rcu_dereference_protected(mvm_sta->link[link_id],
						  lockdep_is_held(&mvm->mutex));

		if (WARN_ON(!mvm_link_sta))
			return -EINVAL;

		ret = iwl_mvm_flush_sta_tids(mvm, mvm_link_sta->sta_id,
					     0xffff);
		if (ret)
			return ret;
	}

	ret = iwl_mvm_wait_sta_queues_empty(mvm, mvm_sta);
	if (ret)
		return ret;

	iwl_mvm_mld_disable_sta_queues(mvm, vif, sta);

	for_each_sta_active_link(vif, sta, link_sta, link_id) {
		struct iwl_mvm_link_sta *mvm_link_sta =
			rcu_dereference_protected(mvm_sta->link[link_id],
						  lockdep_is_held(&mvm->mutex));
		bool stay_in_fw;

		stay_in_fw = iwl_mvm_sta_del(mvm, vif, sta, link_sta, &ret);
		if (ret)
			break;

		if (!stay_in_fw)
			ret = iwl_mvm_mld_rm_sta_from_fw(mvm,
							 mvm_link_sta->sta_id);

		iwl_mvm_mld_free_sta_link(mvm, mvm_sta, mvm_link_sta,
					  link_id, stay_in_fw);
	}
	kfree(mvm_sta->mpdu_counters);
	mvm_sta->mpdu_counters = NULL;

	return ret;
}

int iwl_mvm_mld_rm_sta_id(struct iwl_mvm *mvm, u8 sta_id)
{
	int ret;

	lockdep_assert_held(&mvm->mutex);

	if (WARN_ON(sta_id == IWL_MVM_INVALID_STA))
		return 0;

	ret = iwl_mvm_mld_rm_sta_from_fw(mvm, sta_id);

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

void iwl_mvm_mld_sta_modify_disable_tx(struct iwl_mvm *mvm,
				       struct iwl_mvm_sta *mvmsta,
				       bool disable)
{
	struct iwl_mvm_sta_disable_tx_cmd cmd;
	int ret;

	cmd.sta_id = cpu_to_le32(mvmsta->deflink.sta_id);
	cmd.disable = cpu_to_le32(disable);

	if (WARN_ON(iwl_mvm_has_no_host_disable_tx(mvm)))
		return;

	ret = iwl_mvm_send_cmd_pdu(mvm,
				   WIDE_ID(MAC_CONF_GROUP, STA_DISABLE_TX_CMD),
				   CMD_ASYNC, sizeof(cmd), &cmd);
	if (ret)
		IWL_ERR(mvm,
			"Failed to send STA_DISABLE_TX_CMD command (%d)\n",
			ret);
}

void iwl_mvm_mld_sta_modify_disable_tx_ap(struct iwl_mvm *mvm,
					  struct ieee80211_sta *sta,
					  bool disable)
{
	struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);

	spin_lock_bh(&mvm_sta->lock);

	if (mvm_sta->disable_tx == disable) {
		spin_unlock_bh(&mvm_sta->lock);
		return;
	}

	iwl_mvm_mld_sta_modify_disable_tx(mvm, mvm_sta, disable);

	spin_unlock_bh(&mvm_sta->lock);
}

void iwl_mvm_mld_modify_all_sta_disable_tx(struct iwl_mvm *mvm,
					   struct iwl_mvm_vif *mvmvif,
					   bool disable)
{
	struct ieee80211_sta *sta;
	struct iwl_mvm_sta *mvm_sta;
	int i;

	rcu_read_lock();

	/* Block/unblock all the stations of the given mvmvif */
	for (i = 0; i < mvm->fw->ucode_capa.num_stations; i++) {
		sta = rcu_dereference(mvm->fw_id_to_mac_id[i]);
		if (IS_ERR_OR_NULL(sta))
			continue;

		mvm_sta = iwl_mvm_sta_from_mac80211(sta);
		if (mvm_sta->mac_id_n_color !=
		    FW_CMD_ID_AND_COLOR(mvmvif->id, mvmvif->color))
			continue;

		iwl_mvm_mld_sta_modify_disable_tx(mvm, mvm_sta, disable);
	}

	rcu_read_unlock();
}

static int iwl_mvm_mld_update_sta_queues(struct iwl_mvm *mvm,
					 struct ieee80211_sta *sta,
					 u32 old_sta_mask,
					 u32 new_sta_mask)
{
	struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
	struct iwl_scd_queue_cfg_cmd cmd = {
		.operation = cpu_to_le32(IWL_SCD_QUEUE_MODIFY),
		.u.modify.old_sta_mask = cpu_to_le32(old_sta_mask),
		.u.modify.new_sta_mask = cpu_to_le32(new_sta_mask),
	};
	struct iwl_host_cmd hcmd = {
		.id = WIDE_ID(DATA_PATH_GROUP, SCD_QUEUE_CONFIG_CMD),
		.len[0] = sizeof(cmd),
		.data[0] = &cmd
	};
	int tid;
	int ret;

	lockdep_assert_held(&mvm->mutex);

	for (tid = 0; tid <= IWL_MAX_TID_COUNT; tid++) {
		struct iwl_mvm_tid_data *tid_data = &mvm_sta->tid_data[tid];
		int txq_id = tid_data->txq_id;

		if (txq_id == IWL_MVM_INVALID_QUEUE)
			continue;

		if (tid == IWL_MAX_TID_COUNT)
			cmd.u.modify.tid = cpu_to_le32(IWL_MGMT_TID);
		else
			cmd.u.modify.tid = cpu_to_le32(tid);

		ret = iwl_mvm_send_cmd(mvm, &hcmd);
		if (ret)
			return ret;
	}

	return 0;
}

static int iwl_mvm_mld_update_sta_baids(struct iwl_mvm *mvm,
					u32 old_sta_mask,
					u32 new_sta_mask)
{
	struct iwl_rx_baid_cfg_cmd cmd = {
		.action = cpu_to_le32(IWL_RX_BAID_ACTION_MODIFY),
		.modify.old_sta_id_mask = cpu_to_le32(old_sta_mask),
		.modify.new_sta_id_mask = cpu_to_le32(new_sta_mask),
	};
	u32 cmd_id = WIDE_ID(DATA_PATH_GROUP, RX_BAID_ALLOCATION_CONFIG_CMD);
	int baid;

	/* mac80211 will remove sessions later, but we ignore all that */
	if (test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status))
		return 0;

	BUILD_BUG_ON(sizeof(struct iwl_rx_baid_cfg_resp) != sizeof(baid));

	for (baid = 0; baid < ARRAY_SIZE(mvm->baid_map); baid++) {
		struct iwl_mvm_baid_data *data;
		int ret;

		data = rcu_dereference_protected(mvm->baid_map[baid],
						 lockdep_is_held(&mvm->mutex));
		if (!data)
			continue;

		if (!(data->sta_mask & old_sta_mask))
			continue;

		WARN_ONCE(data->sta_mask != old_sta_mask,
			  "BAID data for %d corrupted - expected 0x%x found 0x%x\n",
			  baid, old_sta_mask, data->sta_mask);

		cmd.modify.tid = cpu_to_le32(data->tid);

		ret = iwl_mvm_send_cmd_pdu(mvm, cmd_id, 0, sizeof(cmd), &cmd);
		data->sta_mask = new_sta_mask;
		if (ret)
			return ret;
	}

	return 0;
}

static int iwl_mvm_mld_update_sta_resources(struct iwl_mvm *mvm,
					    struct ieee80211_vif *vif,
					    struct ieee80211_sta *sta,
					    u32 old_sta_mask,
					    u32 new_sta_mask)
{
	int ret;

	ret = iwl_mvm_mld_update_sta_queues(mvm, sta,
					    old_sta_mask,
					    new_sta_mask);
	if (ret)
		return ret;

	ret = iwl_mvm_mld_update_sta_keys(mvm, vif, sta,
					  old_sta_mask,
					  new_sta_mask);
	if (ret)
		return ret;

	return iwl_mvm_mld_update_sta_baids(mvm, old_sta_mask, new_sta_mask);
}

int iwl_mvm_mld_update_sta_links(struct iwl_mvm *mvm,
				 struct ieee80211_vif *vif,
				 struct ieee80211_sta *sta,
				 u16 old_links, u16 new_links)
{
	struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
	struct iwl_mvm_vif *mvm_vif = iwl_mvm_vif_from_mac80211(vif);
	struct iwl_mvm_link_sta *mvm_sta_link;
	struct iwl_mvm_vif_link_info *mvm_vif_link;
	unsigned long links_to_add = ~old_links & new_links;
	unsigned long links_to_rem = old_links & ~new_links;
	unsigned long old_links_long = old_links;
	u32 current_sta_mask = 0, sta_mask_added = 0, sta_mask_to_rem = 0;
	unsigned long link_sta_added_to_fw = 0, link_sta_allocated = 0;
	unsigned int link_id;
	int ret;

	lockdep_assert_held(&mvm->mutex);

	for_each_set_bit(link_id, &old_links_long,
			 IEEE80211_MLD_MAX_NUM_LINKS) {
		mvm_sta_link =
			rcu_dereference_protected(mvm_sta->link[link_id],
						  lockdep_is_held(&mvm->mutex));

		if (WARN_ON(!mvm_sta_link)) {
			ret = -EINVAL;
			goto err;
		}

		current_sta_mask |= BIT(mvm_sta_link->sta_id);
		if (links_to_rem & BIT(link_id))
			sta_mask_to_rem |= BIT(mvm_sta_link->sta_id);
	}

	if (sta_mask_to_rem) {
		ret = iwl_mvm_mld_update_sta_resources(mvm, vif, sta,
						       current_sta_mask,
						       current_sta_mask &
							~sta_mask_to_rem);
		if (WARN_ON(ret))
			goto err;

		current_sta_mask &= ~sta_mask_to_rem;
	}

	for_each_set_bit(link_id, &links_to_rem, IEEE80211_MLD_MAX_NUM_LINKS) {
		mvm_sta_link =
			rcu_dereference_protected(mvm_sta->link[link_id],
						  lockdep_is_held(&mvm->mutex));
		mvm_vif_link = mvm_vif->link[link_id];

		if (WARN_ON(!mvm_sta_link || !mvm_vif_link)) {
			ret = -EINVAL;
			goto err;
		}

		ret = iwl_mvm_mld_rm_sta_from_fw(mvm, mvm_sta_link->sta_id);
		if (WARN_ON(ret))
			goto err;

		if (vif->type == NL80211_IFTYPE_STATION)
			mvm_vif_link->ap_sta_id = IWL_MVM_INVALID_STA;

		iwl_mvm_mld_free_sta_link(mvm, mvm_sta, mvm_sta_link, link_id,
					  false);
	}

	for_each_set_bit(link_id, &links_to_add, IEEE80211_MLD_MAX_NUM_LINKS) {
		struct ieee80211_bss_conf *link_conf =
			link_conf_dereference_protected(vif, link_id);
		struct ieee80211_link_sta *link_sta =
			link_sta_dereference_protected(sta, link_id);
		mvm_vif_link = mvm_vif->link[link_id];

		if (WARN_ON(!mvm_vif_link || !link_conf || !link_sta)) {
			ret = -EINVAL;
			goto err;
		}

		if (test_bit(IWL_MVM_STATUS_IN_HW_RESTART, &mvm->status)) {
			struct iwl_mvm_link_sta *mvm_link_sta =
				rcu_dereference_protected(mvm_sta->link[link_id],
							  lockdep_is_held(&mvm->mutex));
			u32 sta_id;

			if (WARN_ON(!mvm_link_sta)) {
				ret = -EINVAL;
				goto err;
			}

			sta_id = mvm_link_sta->sta_id;

			rcu_assign_pointer(mvm->fw_id_to_mac_id[sta_id], sta);
			rcu_assign_pointer(mvm->fw_id_to_link_sta[sta_id],
					   link_sta);
		} else {
			if (WARN_ON(mvm_sta->link[link_id])) {
				ret = -EINVAL;
				goto err;
			}
			ret = iwl_mvm_mld_alloc_sta_link(mvm, vif, sta,
							 link_id);
			if (WARN_ON(ret))
				goto err;
		}

		link_sta->agg.max_rc_amsdu_len = 1;
		ieee80211_sta_recalc_aggregates(sta);

		mvm_sta_link =
			rcu_dereference_protected(mvm_sta->link[link_id],
						  lockdep_is_held(&mvm->mutex));

		if (WARN_ON(!mvm_sta_link)) {
			ret = -EINVAL;
			goto err;
		}

		if (vif->type == NL80211_IFTYPE_STATION)
			iwl_mvm_mld_set_ap_sta_id(sta, mvm_vif_link,
						  mvm_sta_link);

		link_sta_allocated |= BIT(link_id);

		sta_mask_added |= BIT(mvm_sta_link->sta_id);

		ret = iwl_mvm_mld_cfg_sta(mvm, sta, vif, link_sta, link_conf,
					  mvm_sta_link);
		if (WARN_ON(ret))
			goto err;

		link_sta_added_to_fw |= BIT(link_id);

		iwl_mvm_rs_add_sta_link(mvm, mvm_sta_link);
	}

	if (sta_mask_added) {
		ret = iwl_mvm_mld_update_sta_resources(mvm, vif, sta,
						       current_sta_mask,
						       current_sta_mask |
							sta_mask_added);
		if (WARN_ON(ret))
			goto err;
	}

	return 0;

err:
	/* remove all already allocated stations in FW */
	for_each_set_bit(link_id, &link_sta_added_to_fw,
			 IEEE80211_MLD_MAX_NUM_LINKS) {
		mvm_sta_link =
			rcu_dereference_protected(mvm_sta->link[link_id],
						  lockdep_is_held(&mvm->mutex));

		iwl_mvm_mld_rm_sta_from_fw(mvm, mvm_sta_link->sta_id);
	}

	/* remove all already allocated station links in driver */
	for_each_set_bit(link_id, &link_sta_allocated,
			 IEEE80211_MLD_MAX_NUM_LINKS) {
		mvm_sta_link =
			rcu_dereference_protected(mvm_sta->link[link_id],
						  lockdep_is_held(&mvm->mutex));

		iwl_mvm_mld_free_sta_link(mvm, mvm_sta, mvm_sta_link, link_id,
					  false);
	}

	return ret;
}