summaryrefslogtreecommitdiffstats
path: root/drivers/net/wireless/iwlwifi/mvm/scan.c
blob: 7554f705383063fa3c7c3610595e9e39f0cc9af8 (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
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
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
/******************************************************************************
 *
 * 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 - 2014 Intel Corporation. All rights reserved.
 * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
 *
 * 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 - 2014 Intel Corporation. All rights reserved.
 * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
 * 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/etherdevice.h>
#include <net/mac80211.h>

#include "mvm.h"
#include "iwl-eeprom-parse.h"
#include "fw-api-scan.h"

#define IWL_PLCP_QUIET_THRESH 1
#define IWL_ACTIVE_QUIET_TIME 10

struct iwl_mvm_scan_params {
	u32 max_out_time;
	u32 suspend_time;
	bool passive_fragmented;
	struct _dwell {
		u16 passive;
		u16 active;
	} dwell[IEEE80211_NUM_BANDS];
};

static inline __le16 iwl_mvm_scan_rx_chain(struct iwl_mvm *mvm)
{
	u16 rx_chain;
	u8 rx_ant;

	if (mvm->scan_rx_ant != ANT_NONE)
		rx_ant = mvm->scan_rx_ant;
	else
		rx_ant = mvm->fw->valid_rx_ant;
	rx_chain = rx_ant << PHY_RX_CHAIN_VALID_POS;
	rx_chain |= rx_ant << PHY_RX_CHAIN_FORCE_MIMO_SEL_POS;
	rx_chain |= rx_ant << PHY_RX_CHAIN_FORCE_SEL_POS;
	rx_chain |= 0x1 << PHY_RX_CHAIN_DRIVER_FORCE_POS;
	return cpu_to_le16(rx_chain);
}

static __le32 iwl_mvm_scan_rxon_flags(enum ieee80211_band band)
{
	if (band == IEEE80211_BAND_2GHZ)
		return cpu_to_le32(PHY_BAND_24);
	else
		return cpu_to_le32(PHY_BAND_5);
}

static inline __le32
iwl_mvm_scan_rate_n_flags(struct iwl_mvm *mvm, enum ieee80211_band band,
			  bool no_cck)
{
	u32 tx_ant;

	mvm->scan_last_antenna_idx =
		iwl_mvm_next_antenna(mvm, mvm->fw->valid_tx_ant,
				     mvm->scan_last_antenna_idx);
	tx_ant = BIT(mvm->scan_last_antenna_idx) << RATE_MCS_ANT_POS;

	if (band == IEEE80211_BAND_2GHZ && !no_cck)
		return cpu_to_le32(IWL_RATE_1M_PLCP | RATE_MCS_CCK_MSK |
				   tx_ant);
	else
		return cpu_to_le32(IWL_RATE_6M_PLCP | tx_ant);
}

/*
 * We insert the SSIDs in an inverted order, because the FW will
 * invert it back. The most prioritized SSID, which is first in the
 * request list, is not copied here, but inserted directly to the probe
 * request.
 */
static void iwl_mvm_scan_fill_ssids(struct iwl_ssid_ie *cmd_ssid,
				    struct cfg80211_ssid *ssids,
				    int n_ssids, int first)
{
	int fw_idx, req_idx;

	for (req_idx = n_ssids - 1, fw_idx = 0; req_idx >= first;
	     req_idx--, fw_idx++) {
		cmd_ssid[fw_idx].id = WLAN_EID_SSID;
		cmd_ssid[fw_idx].len = ssids[req_idx].ssid_len;
		memcpy(cmd_ssid[fw_idx].ssid,
		       ssids[req_idx].ssid,
		       ssids[req_idx].ssid_len);
	}
}

/*
 * If req->n_ssids > 0, it means we should do an active scan.
 * In case of active scan w/o directed scan, we receive a zero-length SSID
 * just to notify that this scan is active and not passive.
 * In order to notify the FW of the number of SSIDs we wish to scan (including
 * the zero-length one), we need to set the corresponding bits in chan->type,
 * one for each SSID, and set the active bit (first). If the first SSID is
 * already included in the probe template, so we need to set only
 * req->n_ssids - 1 bits in addition to the first bit.
 */
static u16 iwl_mvm_get_active_dwell(enum ieee80211_band band, int n_ssids)
{
	if (band == IEEE80211_BAND_2GHZ)
		return 20  + 3 * (n_ssids + 1);
	return 10  + 2 * (n_ssids + 1);
}

static u16 iwl_mvm_get_passive_dwell(enum ieee80211_band band)
{
	return band == IEEE80211_BAND_2GHZ ? 100 + 20 : 100 + 10;
}

static void iwl_mvm_scan_fill_channels(struct iwl_scan_cmd *cmd,
				       struct cfg80211_scan_request *req,
				       bool basic_ssid,
				       struct iwl_mvm_scan_params *params)
{
	struct iwl_scan_channel *chan = (struct iwl_scan_channel *)
		(cmd->data + le16_to_cpu(cmd->tx_cmd.len));
	int i;
	int type = BIT(req->n_ssids) - 1;
	enum ieee80211_band band = req->channels[0]->band;

	if (!basic_ssid)
		type |= BIT(req->n_ssids);

	for (i = 0; i < cmd->channel_count; i++) {
		chan->channel = cpu_to_le16(req->channels[i]->hw_value);
		chan->type = cpu_to_le32(type);
		if (req->channels[i]->flags & IEEE80211_CHAN_NO_IR)
			chan->type &= cpu_to_le32(~SCAN_CHANNEL_TYPE_ACTIVE);
		chan->active_dwell = cpu_to_le16(params->dwell[band].active);
		chan->passive_dwell = cpu_to_le16(params->dwell[band].passive);
		chan->iteration_count = cpu_to_le16(1);
		chan++;
	}
}

/*
 * Fill in probe request with the following parameters:
 * TA is our vif HW address, which mac80211 ensures we have.
 * Packet is broadcasted, so this is both SA and DA.
 * The probe request IE is made out of two: first comes the most prioritized
 * SSID if a directed scan is requested. Second comes whatever extra
 * information was given to us as the scan request IE.
 */
static u16 iwl_mvm_fill_probe_req(struct ieee80211_mgmt *frame, const u8 *ta,
				  int n_ssids, const u8 *ssid, int ssid_len,
				  const u8 *band_ie, int band_ie_len,
				  const u8 *common_ie, int common_ie_len,
				  int left)
{
	int len = 0;
	u8 *pos = NULL;

	/* Make sure there is enough space for the probe request,
	 * two mandatory IEs and the data */
	left -= 24;
	if (left < 0)
		return 0;

	frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
	eth_broadcast_addr(frame->da);
	memcpy(frame->sa, ta, ETH_ALEN);
	eth_broadcast_addr(frame->bssid);
	frame->seq_ctrl = 0;

	len += 24;

	/* for passive scans, no need to fill anything */
	if (n_ssids == 0)
		return (u16)len;

	/* points to the payload of the request */
	pos = &frame->u.probe_req.variable[0];

	/* fill in our SSID IE */
	left -= ssid_len + 2;
	if (left < 0)
		return 0;
	*pos++ = WLAN_EID_SSID;
	*pos++ = ssid_len;
	if (ssid && ssid_len) { /* ssid_len may be == 0 even if ssid is valid */
		memcpy(pos, ssid, ssid_len);
		pos += ssid_len;
	}

	len += ssid_len + 2;

	if (WARN_ON(left < band_ie_len + common_ie_len))
		return len;

	if (band_ie && band_ie_len) {
		memcpy(pos, band_ie, band_ie_len);
		pos += band_ie_len;
		len += band_ie_len;
	}

	if (common_ie && common_ie_len) {
		memcpy(pos, common_ie, common_ie_len);
		pos += common_ie_len;
		len += common_ie_len;
	}

	return (u16)len;
}

static void iwl_mvm_scan_condition_iterator(void *data, u8 *mac,
					    struct ieee80211_vif *vif)
{
	struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
	bool *global_bound = data;

	if (mvmvif->phy_ctxt && mvmvif->phy_ctxt->id < MAX_PHYS)
		*global_bound = true;
}

static void iwl_mvm_scan_calc_params(struct iwl_mvm *mvm,
				     struct ieee80211_vif *vif,
				     int n_ssids, u32 flags,
				     struct iwl_mvm_scan_params *params)
{
	bool global_bound = false;
	enum ieee80211_band band;
	u8 frag_passive_dwell = 0;

	ieee80211_iterate_active_interfaces_atomic(mvm->hw,
					    IEEE80211_IFACE_ITER_NORMAL,
					    iwl_mvm_scan_condition_iterator,
					    &global_bound);

	if (!global_bound)
		goto not_bound;

	params->suspend_time = 30;
	params->max_out_time = 170;

	if (iwl_mvm_low_latency(mvm)) {
		if (mvm->fw->ucode_capa.api[0] &
		    IWL_UCODE_TLV_API_FRAGMENTED_SCAN) {
			params->suspend_time = 105;
			params->max_out_time = 70;
			frag_passive_dwell = 20;
		} else {
			params->suspend_time = 120;
			params->max_out_time = 120;
		}
	}

	if (frag_passive_dwell && (mvm->fw->ucode_capa.api[0] &
				   IWL_UCODE_TLV_API_FRAGMENTED_SCAN)) {
		/*
		 * P2P device scan should not be fragmented to avoid negative
		 * impact on P2P device discovery. Configure max_out_time to be
		 * equal to dwell time on passive channel. Take a longest
		 * possible value, one that corresponds to 2GHz band
		 */
		if (vif->type == NL80211_IFTYPE_P2P_DEVICE) {
			u32 passive_dwell =
				iwl_mvm_get_passive_dwell(IEEE80211_BAND_2GHZ);
			params->max_out_time = passive_dwell;
		} else {
			params->passive_fragmented = true;
		}
	}

	if (flags & NL80211_SCAN_FLAG_LOW_PRIORITY)
		params->max_out_time = 200;

not_bound:

	for (band = IEEE80211_BAND_2GHZ; band < IEEE80211_NUM_BANDS; band++) {
		if (params->passive_fragmented)
			params->dwell[band].passive = frag_passive_dwell;
		else
			params->dwell[band].passive =
				iwl_mvm_get_passive_dwell(band);
		params->dwell[band].active = iwl_mvm_get_active_dwell(band,
								      n_ssids);
	}
}

static inline bool iwl_mvm_rrm_scan_needed(struct iwl_mvm *mvm)
{
	/* require rrm scan whenever the fw supports it */
	return mvm->fw->ucode_capa.capa[0] &
	       IWL_UCODE_TLV_CAPA_DS_PARAM_SET_IE_SUPPORT;
}

static int iwl_mvm_max_scan_ie_fw_cmd_room(struct iwl_mvm *mvm,
					   bool is_sched_scan)
{
	int max_probe_len;

	if (mvm->fw->ucode_capa.api[0] & IWL_UCODE_TLV_API_LMAC_SCAN)
		max_probe_len = SCAN_OFFLOAD_PROBE_REQ_SIZE;
	else
		max_probe_len = mvm->fw->ucode_capa.max_probe_length;

	/* we create the 802.11 header and SSID element */
	max_probe_len -= 24 + 2;

	/* basic ssid is added only for hw_scan with and old api */
	if (!(mvm->fw->ucode_capa.flags & IWL_UCODE_TLV_FLAGS_NO_BASIC_SSID) &&
	    !(mvm->fw->ucode_capa.api[0] & IWL_UCODE_TLV_API_LMAC_SCAN) &&
	    !is_sched_scan)
		max_probe_len -= 32;

	return max_probe_len;
}

int iwl_mvm_max_scan_ie_len(struct iwl_mvm *mvm, bool is_sched_scan)
{
	int max_ie_len = iwl_mvm_max_scan_ie_fw_cmd_room(mvm, is_sched_scan);

	if (!(mvm->fw->ucode_capa.api[0] & IWL_UCODE_TLV_API_LMAC_SCAN))
		return max_ie_len;

	/* TODO: [BUG] This function should return the maximum allowed size of
	 * scan IEs, however the LMAC scan api contains both 2GHZ and 5GHZ IEs
	 * in the same command. So the correct implementation of this function
	 * is just iwl_mvm_max_scan_ie_fw_cmd_room() / 2. Currently the scan
	 * command has only 512 bytes and it would leave us with about 240
	 * bytes for scan IEs, which is clearly not enough. So meanwhile
	 * we will report an incorrect value. This may result in a failure to
	 * issue a scan in unified_scan_lmac and unified_sched_scan_lmac
	 * functions with -ENOBUFS, if a large enough probe will be provided.
	 */
	return max_ie_len;
}

int iwl_mvm_scan_request(struct iwl_mvm *mvm,
			 struct ieee80211_vif *vif,
			 struct cfg80211_scan_request *req)
{
	struct iwl_host_cmd hcmd = {
		.id = SCAN_REQUEST_CMD,
		.len = { 0, },
		.data = { mvm->scan_cmd, },
		.dataflags = { IWL_HCMD_DFL_NOCOPY, },
	};
	struct iwl_scan_cmd *cmd = mvm->scan_cmd;
	int ret;
	u32 status;
	int ssid_len = 0;
	u8 *ssid = NULL;
	bool basic_ssid = !(mvm->fw->ucode_capa.flags &
			   IWL_UCODE_TLV_FLAGS_NO_BASIC_SSID);
	struct iwl_mvm_scan_params params = {};

	lockdep_assert_held(&mvm->mutex);

	/* we should have failed registration if scan_cmd was NULL */
	if (WARN_ON(mvm->scan_cmd == NULL))
		return -ENOMEM;

	IWL_DEBUG_SCAN(mvm, "Handling mac80211 scan request\n");
	mvm->scan_status = IWL_MVM_SCAN_OS;
	memset(cmd, 0, ksize(cmd));

	cmd->channel_count = (u8)req->n_channels;
	cmd->quiet_time = cpu_to_le16(IWL_ACTIVE_QUIET_TIME);
	cmd->quiet_plcp_th = cpu_to_le16(IWL_PLCP_QUIET_THRESH);
	cmd->rxchain_sel_flags = iwl_mvm_scan_rx_chain(mvm);

	iwl_mvm_scan_calc_params(mvm, vif, req->n_ssids, req->flags, &params);
	cmd->max_out_time = cpu_to_le32(params.max_out_time);
	cmd->suspend_time = cpu_to_le32(params.suspend_time);
	if (params.passive_fragmented)
		cmd->scan_flags |= SCAN_FLAGS_FRAGMENTED_SCAN;

	cmd->rxon_flags = iwl_mvm_scan_rxon_flags(req->channels[0]->band);
	cmd->filter_flags = cpu_to_le32(MAC_FILTER_ACCEPT_GRP |
					MAC_FILTER_IN_BEACON);

	if (vif->type == NL80211_IFTYPE_P2P_DEVICE)
		cmd->type = cpu_to_le32(SCAN_TYPE_DISCOVERY_FORCED);
	else
		cmd->type = cpu_to_le32(SCAN_TYPE_FORCED);

	cmd->repeats = cpu_to_le32(1);

	/*
	 * If the user asked for passive scan, don't change to active scan if
	 * you see any activity on the channel - remain passive.
	 */
	if (req->n_ssids > 0) {
		cmd->passive2active = cpu_to_le16(1);
		cmd->scan_flags |= SCAN_FLAGS_PASSIVE2ACTIVE;
		if (basic_ssid) {
			ssid = req->ssids[0].ssid;
			ssid_len = req->ssids[0].ssid_len;
		}
	} else {
		cmd->passive2active = 0;
		cmd->scan_flags &= ~SCAN_FLAGS_PASSIVE2ACTIVE;
	}

	iwl_mvm_scan_fill_ssids(cmd->direct_scan, req->ssids, req->n_ssids,
				basic_ssid ? 1 : 0);

	cmd->tx_cmd.tx_flags = cpu_to_le32(TX_CMD_FLG_SEQ_CTL |
					   3 << TX_CMD_FLG_BT_PRIO_POS);

	cmd->tx_cmd.sta_id = mvm->aux_sta.sta_id;
	cmd->tx_cmd.life_time = cpu_to_le32(TX_CMD_LIFE_TIME_INFINITE);
	cmd->tx_cmd.rate_n_flags =
			iwl_mvm_scan_rate_n_flags(mvm, req->channels[0]->band,
						  req->no_cck);

	cmd->tx_cmd.len =
		cpu_to_le16(iwl_mvm_fill_probe_req(
			    (struct ieee80211_mgmt *)cmd->data,
			    vif->addr,
			    req->n_ssids, ssid, ssid_len,
			    req->ie, req->ie_len, NULL, 0,
			    mvm->fw->ucode_capa.max_probe_length));

	iwl_mvm_scan_fill_channels(cmd, req, basic_ssid, &params);

	cmd->len = cpu_to_le16(sizeof(struct iwl_scan_cmd) +
		le16_to_cpu(cmd->tx_cmd.len) +
		(cmd->channel_count * sizeof(struct iwl_scan_channel)));
	hcmd.len[0] = le16_to_cpu(cmd->len);

	status = SCAN_RESPONSE_OK;
	ret = iwl_mvm_send_cmd_status(mvm, &hcmd, &status);
	if (!ret && status == SCAN_RESPONSE_OK) {
		IWL_DEBUG_SCAN(mvm, "Scan request was sent successfully\n");
	} else {
		/*
		 * If the scan failed, it usually means that the FW was unable
		 * to allocate the time events. Warn on it, but maybe we
		 * should try to send the command again with different params.
		 */
		IWL_ERR(mvm, "Scan failed! status 0x%x ret %d\n",
			status, ret);
		mvm->scan_status = IWL_MVM_SCAN_NONE;
		ret = -EIO;
	}
	return ret;
}

int iwl_mvm_rx_scan_response(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_cmd_response *resp = (void *)pkt->data;

	IWL_DEBUG_SCAN(mvm, "Scan response received. status 0x%x\n",
		       le32_to_cpu(resp->status));
	return 0;
}

int iwl_mvm_rx_scan_complete(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_scan_complete_notif *notif = (void *)pkt->data;

	lockdep_assert_held(&mvm->mutex);

	IWL_DEBUG_SCAN(mvm, "Scan complete: status=0x%x scanned channels=%d\n",
		       notif->status, notif->scanned_channels);

	if (mvm->scan_status == IWL_MVM_SCAN_OS)
		mvm->scan_status = IWL_MVM_SCAN_NONE;
	ieee80211_scan_completed(mvm->hw, notif->status != SCAN_COMP_STATUS_OK);

	iwl_mvm_unref(mvm, IWL_MVM_REF_SCAN);

	return 0;
}

int iwl_mvm_rx_scan_offload_results(struct iwl_mvm *mvm,
				    struct iwl_rx_cmd_buffer *rxb,
				    struct iwl_device_cmd *cmd)
{
	struct iwl_rx_packet *pkt = rxb_addr(rxb);
	u8 client_bitmap = 0;

	if (!(mvm->fw->ucode_capa.api[0] & IWL_UCODE_TLV_API_LMAC_SCAN)) {
		struct iwl_sched_scan_results *notif = (void *)pkt->data;

		client_bitmap = notif->client_bitmap;
	}

	if (mvm->fw->ucode_capa.api[0] & IWL_UCODE_TLV_API_LMAC_SCAN ||
	    client_bitmap & SCAN_CLIENT_SCHED_SCAN) {
		if (mvm->scan_status == IWL_MVM_SCAN_SCHED) {
			IWL_DEBUG_SCAN(mvm, "Scheduled scan results\n");
			ieee80211_sched_scan_results(mvm->hw);
		} else {
			IWL_DEBUG_SCAN(mvm, "Scan results\n");
		}
	}

	return 0;
}

static bool iwl_mvm_scan_abort_notif(struct iwl_notif_wait_data *notif_wait,
				     struct iwl_rx_packet *pkt, void *data)
{
	struct iwl_mvm *mvm =
		container_of(notif_wait, struct iwl_mvm, notif_wait);
	struct iwl_scan_complete_notif *notif;
	u32 *resp;

	switch (pkt->hdr.cmd) {
	case SCAN_ABORT_CMD:
		resp = (void *)pkt->data;
		if (*resp == CAN_ABORT_STATUS) {
			IWL_DEBUG_SCAN(mvm,
				       "Scan can be aborted, wait until completion\n");
			return false;
		}

		/*
		 * If scan cannot be aborted, it means that we had a
		 * SCAN_COMPLETE_NOTIFICATION in the pipe and it called
		 * ieee80211_scan_completed already.
		 */
		IWL_DEBUG_SCAN(mvm, "Scan cannot be aborted, exit now: %d\n",
			       *resp);
		return true;

	case SCAN_COMPLETE_NOTIFICATION:
		notif = (void *)pkt->data;
		IWL_DEBUG_SCAN(mvm, "Scan aborted: status 0x%x\n",
			       notif->status);
		return true;

	default:
		WARN_ON(1);
		return false;
	};
}

static int iwl_mvm_cancel_regular_scan(struct iwl_mvm *mvm)
{
	struct iwl_notification_wait wait_scan_abort;
	static const u8 scan_abort_notif[] = { SCAN_ABORT_CMD,
					       SCAN_COMPLETE_NOTIFICATION };
	int ret;

	iwl_init_notification_wait(&mvm->notif_wait, &wait_scan_abort,
				   scan_abort_notif,
				   ARRAY_SIZE(scan_abort_notif),
				   iwl_mvm_scan_abort_notif, NULL);

	ret = iwl_mvm_send_cmd_pdu(mvm, SCAN_ABORT_CMD, 0, 0, NULL);
	if (ret) {
		IWL_ERR(mvm, "Couldn't send SCAN_ABORT_CMD: %d\n", ret);
		/* mac80211's state will be cleaned in the nic_restart flow */
		goto out_remove_notif;
	}

	return iwl_wait_notification(&mvm->notif_wait, &wait_scan_abort, HZ);

out_remove_notif:
	iwl_remove_notification(&mvm->notif_wait, &wait_scan_abort);
	return ret;
}

int iwl_mvm_rx_scan_offload_complete_notif(struct iwl_mvm *mvm,
					   struct iwl_rx_cmd_buffer *rxb,
					   struct iwl_device_cmd *cmd)
{
	struct iwl_rx_packet *pkt = rxb_addr(rxb);
	u8 status, ebs_status;

	if (mvm->fw->ucode_capa.api[0] & IWL_UCODE_TLV_API_LMAC_SCAN) {
		struct iwl_periodic_scan_complete *scan_notif;

		scan_notif = (void *)pkt->data;
		status = scan_notif->status;
		ebs_status = scan_notif->ebs_status;
	} else  {
		struct iwl_scan_offload_complete *scan_notif;

		scan_notif = (void *)pkt->data;
		status = scan_notif->status;
		ebs_status = scan_notif->ebs_status;
	}
	/* scan status must be locked for proper checking */
	lockdep_assert_held(&mvm->mutex);

	IWL_DEBUG_SCAN(mvm,
		       "%s completed, status %s, EBS status %s\n",
		       mvm->scan_status == IWL_MVM_SCAN_SCHED ?
				"Scheduled scan" : "Scan",
		       status == IWL_SCAN_OFFLOAD_COMPLETED ?
				"completed" : "aborted",
		       ebs_status == IWL_SCAN_EBS_SUCCESS ?
				"success" : "failed");


	/* only call mac80211 completion if the stop was initiated by FW */
	if (mvm->scan_status == IWL_MVM_SCAN_SCHED) {
		mvm->scan_status = IWL_MVM_SCAN_NONE;
		ieee80211_sched_scan_stopped(mvm->hw);
	} else if (mvm->scan_status == IWL_MVM_SCAN_OS) {
		mvm->scan_status = IWL_MVM_SCAN_NONE;
		ieee80211_scan_completed(mvm->hw,
					 status == IWL_SCAN_OFFLOAD_ABORTED);
	}

	mvm->last_ebs_successful = !ebs_status;

	return 0;
}

static void iwl_scan_offload_build_tx_cmd(struct iwl_mvm *mvm,
					  struct ieee80211_vif *vif,
					  struct ieee80211_scan_ies *ies,
					  enum ieee80211_band band,
					  struct iwl_tx_cmd *cmd,
					  u8 *data)
{
	u16 cmd_len;

	cmd->tx_flags = cpu_to_le32(TX_CMD_FLG_SEQ_CTL);
	cmd->life_time = cpu_to_le32(TX_CMD_LIFE_TIME_INFINITE);
	cmd->sta_id = mvm->aux_sta.sta_id;

	cmd->rate_n_flags = iwl_mvm_scan_rate_n_flags(mvm, band, false);

	cmd_len = iwl_mvm_fill_probe_req((struct ieee80211_mgmt *)data,
					 vif->addr,
					 1, NULL, 0,
					 ies->ies[band], ies->len[band],
					 ies->common_ies, ies->common_ie_len,
					 SCAN_OFFLOAD_PROBE_REQ_SIZE);
	cmd->len = cpu_to_le16(cmd_len);
}

static void iwl_build_scan_cmd(struct iwl_mvm *mvm,
			       struct ieee80211_vif *vif,
			       struct cfg80211_sched_scan_request *req,
			       struct iwl_scan_offload_cmd *scan,
			       struct iwl_mvm_scan_params *params)
{
	scan->channel_count = req->n_channels;
	scan->quiet_time = cpu_to_le16(IWL_ACTIVE_QUIET_TIME);
	scan->quiet_plcp_th = cpu_to_le16(IWL_PLCP_QUIET_THRESH);
	scan->good_CRC_th = IWL_GOOD_CRC_TH_DEFAULT;
	scan->rx_chain = iwl_mvm_scan_rx_chain(mvm);

	scan->max_out_time = cpu_to_le32(params->max_out_time);
	scan->suspend_time = cpu_to_le32(params->suspend_time);

	scan->filter_flags |= cpu_to_le32(MAC_FILTER_ACCEPT_GRP |
					  MAC_FILTER_IN_BEACON);
	scan->scan_type = cpu_to_le32(SCAN_TYPE_BACKGROUND);
	scan->rep_count = cpu_to_le32(1);

	if (params->passive_fragmented)
		scan->scan_flags |= SCAN_FLAGS_FRAGMENTED_SCAN;
}

static int iwl_ssid_exist(u8 *ssid, u8 ssid_len, struct iwl_ssid_ie *ssid_list)
{
	int i;

	for (i = 0; i < PROBE_OPTION_MAX; i++) {
		if (!ssid_list[i].len)
			break;
		if (ssid_list[i].len == ssid_len &&
		    !memcmp(ssid_list->ssid, ssid, ssid_len))
			return i;
	}
	return -1;
}

static void iwl_scan_offload_build_ssid(struct cfg80211_sched_scan_request *req,
					struct iwl_ssid_ie *direct_scan,
					u32 *ssid_bitmap, bool basic_ssid)
{
	int i, j;
	int index;

	/*
	 * copy SSIDs from match list.
	 * iwl_config_sched_scan_profiles() uses the order of these ssids to
	 * config match list.
	 */
	for (i = 0; i < req->n_match_sets && i < PROBE_OPTION_MAX; i++) {
		/* skip empty SSID matchsets */
		if (!req->match_sets[i].ssid.ssid_len)
			continue;
		direct_scan[i].id = WLAN_EID_SSID;
		direct_scan[i].len = req->match_sets[i].ssid.ssid_len;
		memcpy(direct_scan[i].ssid, req->match_sets[i].ssid.ssid,
		       direct_scan[i].len);
	}

	/* add SSIDs from scan SSID list */
	*ssid_bitmap = 0;
	for (j = 0; j < req->n_ssids && i < PROBE_OPTION_MAX; j++) {
		index = iwl_ssid_exist(req->ssids[j].ssid,
				       req->ssids[j].ssid_len,
				       direct_scan);
		if (index < 0) {
			if (!req->ssids[j].ssid_len && basic_ssid)
				continue;
			direct_scan[i].id = WLAN_EID_SSID;
			direct_scan[i].len = req->ssids[j].ssid_len;
			memcpy(direct_scan[i].ssid, req->ssids[j].ssid,
			       direct_scan[i].len);
			*ssid_bitmap |= BIT(i + 1);
			i++;
		} else {
			*ssid_bitmap |= BIT(index + 1);
		}
	}
}

static void iwl_build_channel_cfg(struct iwl_mvm *mvm,
				  struct cfg80211_sched_scan_request *req,
				  u8 *channels_buffer,
				  enum ieee80211_band band,
				  int *head,
				  u32 ssid_bitmap,
				  struct iwl_mvm_scan_params *params)
{
	u32 n_channels = mvm->fw->ucode_capa.n_scan_channels;
	__le32 *type = (__le32 *)channels_buffer;
	__le16 *channel_number = (__le16 *)(type + n_channels);
	__le16 *iter_count = channel_number + n_channels;
	__le32 *iter_interval = (__le32 *)(iter_count + n_channels);
	u8 *active_dwell = (u8 *)(iter_interval + n_channels);
	u8 *passive_dwell = active_dwell + n_channels;
	int i, index = 0;

	for (i = 0; i < req->n_channels; i++) {
		struct ieee80211_channel *chan = req->channels[i];

		if (chan->band != band)
			continue;

		index = *head;
		(*head)++;

		channel_number[index] = cpu_to_le16(chan->hw_value);
		active_dwell[index] = params->dwell[band].active;
		passive_dwell[index] = params->dwell[band].passive;

		iter_count[index] = cpu_to_le16(1);
		iter_interval[index] = 0;

		if (!(chan->flags & IEEE80211_CHAN_NO_IR))
			type[index] |=
				cpu_to_le32(IWL_SCAN_OFFLOAD_CHANNEL_ACTIVE);

		type[index] |= cpu_to_le32(IWL_SCAN_OFFLOAD_CHANNEL_FULL |
					   IWL_SCAN_OFFLOAD_CHANNEL_PARTIAL);

		if (chan->flags & IEEE80211_CHAN_NO_HT40)
			type[index] |=
				cpu_to_le32(IWL_SCAN_OFFLOAD_CHANNEL_NARROW);

		/* scan for all SSIDs from req->ssids */
		type[index] |= cpu_to_le32(ssid_bitmap);
	}
}

int iwl_mvm_config_sched_scan(struct iwl_mvm *mvm,
			      struct ieee80211_vif *vif,
			      struct cfg80211_sched_scan_request *req,
			      struct ieee80211_scan_ies *ies)
{
	int band_2ghz = mvm->nvm_data->bands[IEEE80211_BAND_2GHZ].n_channels;
	int band_5ghz = mvm->nvm_data->bands[IEEE80211_BAND_5GHZ].n_channels;
	int head = 0;
	u32 ssid_bitmap;
	int cmd_len;
	int ret;
	u8 *probes;
	bool basic_ssid = !(mvm->fw->ucode_capa.flags &
			    IWL_UCODE_TLV_FLAGS_NO_BASIC_SSID);

	struct iwl_scan_offload_cfg *scan_cfg;
	struct iwl_host_cmd cmd = {
		.id = SCAN_OFFLOAD_CONFIG_CMD,
	};
	struct iwl_mvm_scan_params params = {};

	lockdep_assert_held(&mvm->mutex);

	cmd_len = sizeof(struct iwl_scan_offload_cfg) +
		  mvm->fw->ucode_capa.n_scan_channels * IWL_SCAN_CHAN_SIZE +
		  2 * SCAN_OFFLOAD_PROBE_REQ_SIZE;

	scan_cfg = kzalloc(cmd_len, GFP_KERNEL);
	if (!scan_cfg)
		return -ENOMEM;

	probes = scan_cfg->data +
		mvm->fw->ucode_capa.n_scan_channels * IWL_SCAN_CHAN_SIZE;

	iwl_mvm_scan_calc_params(mvm, vif, req->n_ssids, 0, &params);
	iwl_build_scan_cmd(mvm, vif, req, &scan_cfg->scan_cmd, &params);
	scan_cfg->scan_cmd.len = cpu_to_le16(cmd_len);

	iwl_scan_offload_build_ssid(req, scan_cfg->scan_cmd.direct_scan,
				    &ssid_bitmap, basic_ssid);
	/* build tx frames for supported bands */
	if (band_2ghz) {
		iwl_scan_offload_build_tx_cmd(mvm, vif, ies,
					      IEEE80211_BAND_2GHZ,
					      &scan_cfg->scan_cmd.tx_cmd[0],
					      probes);
		iwl_build_channel_cfg(mvm, req, scan_cfg->data,
				      IEEE80211_BAND_2GHZ, &head,
				      ssid_bitmap, &params);
	}
	if (band_5ghz) {
		iwl_scan_offload_build_tx_cmd(mvm, vif, ies,
					      IEEE80211_BAND_5GHZ,
					      &scan_cfg->scan_cmd.tx_cmd[1],
					      probes +
						SCAN_OFFLOAD_PROBE_REQ_SIZE);
		iwl_build_channel_cfg(mvm, req, scan_cfg->data,
				      IEEE80211_BAND_5GHZ, &head,
				      ssid_bitmap, &params);
	}

	cmd.data[0] = scan_cfg;
	cmd.len[0] = cmd_len;
	cmd.dataflags[0] = IWL_HCMD_DFL_NOCOPY;

	IWL_DEBUG_SCAN(mvm, "Sending scheduled scan config\n");

	ret = iwl_mvm_send_cmd(mvm, &cmd);
	kfree(scan_cfg);
	return ret;
}

int iwl_mvm_config_sched_scan_profiles(struct iwl_mvm *mvm,
				       struct cfg80211_sched_scan_request *req)
{
	struct iwl_scan_offload_profile *profile;
	struct iwl_scan_offload_profile_cfg *profile_cfg;
	struct iwl_scan_offload_blacklist *blacklist;
	struct iwl_host_cmd cmd = {
		.id = SCAN_OFFLOAD_UPDATE_PROFILES_CMD,
		.len[1] = sizeof(*profile_cfg),
		.dataflags[0] = IWL_HCMD_DFL_NOCOPY,
		.dataflags[1] = IWL_HCMD_DFL_NOCOPY,
	};
	int blacklist_len;
	int i;
	int ret;

	if (WARN_ON(req->n_match_sets > IWL_SCAN_MAX_PROFILES))
			return -EIO;

	if (mvm->fw->ucode_capa.flags & IWL_UCODE_TLV_FLAGS_SHORT_BL)
		blacklist_len = IWL_SCAN_SHORT_BLACKLIST_LEN;
	else
		blacklist_len = IWL_SCAN_MAX_BLACKLIST_LEN;

	blacklist = kzalloc(sizeof(*blacklist) * blacklist_len, GFP_KERNEL);
	if (!blacklist)
		return -ENOMEM;

	profile_cfg = kzalloc(sizeof(*profile_cfg), GFP_KERNEL);
	if (!profile_cfg) {
		ret = -ENOMEM;
		goto free_blacklist;
	}

	cmd.data[0] = blacklist;
	cmd.len[0] = sizeof(*blacklist) * blacklist_len;
	cmd.data[1] = profile_cfg;

	/* No blacklist configuration */

	profile_cfg->num_profiles = req->n_match_sets;
	profile_cfg->active_clients = SCAN_CLIENT_SCHED_SCAN;
	profile_cfg->pass_match = SCAN_CLIENT_SCHED_SCAN;
	profile_cfg->match_notify = SCAN_CLIENT_SCHED_SCAN;
	if (!req->n_match_sets || !req->match_sets[0].ssid.ssid_len)
		profile_cfg->any_beacon_notify = SCAN_CLIENT_SCHED_SCAN;

	for (i = 0; i < req->n_match_sets; i++) {
		profile = &profile_cfg->profiles[i];
		profile->ssid_index = i;
		/* Support any cipher and auth algorithm */
		profile->unicast_cipher = 0xff;
		profile->auth_alg = 0xff;
		profile->network_type = IWL_NETWORK_TYPE_ANY;
		profile->band_selection = IWL_SCAN_OFFLOAD_SELECT_ANY;
		profile->client_bitmap = SCAN_CLIENT_SCHED_SCAN;
	}

	IWL_DEBUG_SCAN(mvm, "Sending scheduled scan profile config\n");

	ret = iwl_mvm_send_cmd(mvm, &cmd);
	kfree(profile_cfg);
free_blacklist:
	kfree(blacklist);

	return ret;
}

int iwl_mvm_sched_scan_start(struct iwl_mvm *mvm,
			     struct cfg80211_sched_scan_request *req)
{
	struct iwl_scan_offload_req scan_req = {
		.watchdog = IWL_SCHED_SCAN_WATCHDOG,

		.schedule_line[0].iterations = IWL_FAST_SCHED_SCAN_ITERATIONS,
		.schedule_line[0].delay = cpu_to_le16(req->interval / 1000),
		.schedule_line[0].full_scan_mul = 1,

		.schedule_line[1].iterations = 0xff,
		.schedule_line[1].delay = cpu_to_le16(req->interval / 1000),
		.schedule_line[1].full_scan_mul = IWL_FULL_SCAN_MULTIPLIER,
	};

	if (req->n_match_sets && req->match_sets[0].ssid.ssid_len) {
		IWL_DEBUG_SCAN(mvm,
			       "Sending scheduled scan with filtering, filter len %d\n",
			       req->n_match_sets);
	} else {
		IWL_DEBUG_SCAN(mvm,
			       "Sending Scheduled scan without filtering\n");
		scan_req.flags |= cpu_to_le16(IWL_SCAN_OFFLOAD_FLAG_PASS_ALL);
	}

	if (mvm->last_ebs_successful &&
	    mvm->fw->ucode_capa.flags & IWL_UCODE_TLV_FLAGS_EBS_SUPPORT)
		scan_req.flags |=
			cpu_to_le16(IWL_SCAN_OFFLOAD_FLAG_EBS_ACCURATE_MODE);

	return iwl_mvm_send_cmd_pdu(mvm, SCAN_OFFLOAD_REQUEST_CMD, 0,
				    sizeof(scan_req), &scan_req);
}

static int iwl_mvm_send_scan_offload_abort(struct iwl_mvm *mvm)
{
	int ret;
	struct iwl_host_cmd cmd = {
		.id = SCAN_OFFLOAD_ABORT_CMD,
	};
	u32 status;

	/* Exit instantly with error when device is not ready
	 * to receive scan abort command or it does not perform
	 * scheduled scan currently */
	if (mvm->scan_status != IWL_MVM_SCAN_SCHED &&
	    (!(mvm->fw->ucode_capa.api[0] & IWL_UCODE_TLV_API_LMAC_SCAN) ||
	     mvm->scan_status != IWL_MVM_SCAN_OS))
		return -EIO;

	ret = iwl_mvm_send_cmd_status(mvm, &cmd, &status);
	if (ret)
		return ret;

	if (status != CAN_ABORT_STATUS) {
		/*
		 * The scan abort will return 1 for success or
		 * 2 for "failure".  A failure condition can be
		 * due to simply not being in an active scan which
		 * can occur if we send the scan abort before the
		 * microcode has notified us that a scan is completed.
		 */
		IWL_DEBUG_SCAN(mvm, "SCAN OFFLOAD ABORT ret %d.\n", status);
		ret = -ENOENT;
	}

	return ret;
}

int iwl_mvm_scan_offload_stop(struct iwl_mvm *mvm, bool notify)
{
	int ret;
	struct iwl_notification_wait wait_scan_done;
	static const u8 scan_done_notif[] = { SCAN_OFFLOAD_COMPLETE, };
	bool sched = mvm->scan_status == IWL_MVM_SCAN_SCHED;

	lockdep_assert_held(&mvm->mutex);

	if (mvm->scan_status != IWL_MVM_SCAN_SCHED &&
	    (!(mvm->fw->ucode_capa.api[0] & IWL_UCODE_TLV_API_LMAC_SCAN) ||
	     mvm->scan_status != IWL_MVM_SCAN_OS)) {
		IWL_DEBUG_SCAN(mvm, "No scan to stop\n");
		return 0;
	}

	iwl_init_notification_wait(&mvm->notif_wait, &wait_scan_done,
				   scan_done_notif,
				   ARRAY_SIZE(scan_done_notif),
				   NULL, NULL);

	ret = iwl_mvm_send_scan_offload_abort(mvm);
	if (ret) {
		IWL_DEBUG_SCAN(mvm, "Send stop %sscan failed %d\n",
			       sched ? "offloaded " : "", ret);
		iwl_remove_notification(&mvm->notif_wait, &wait_scan_done);
		return ret;
	}

	IWL_DEBUG_SCAN(mvm, "Successfully sent stop %sscan\n",
		       sched ? "offloaded " : "");

	ret = iwl_wait_notification(&mvm->notif_wait, &wait_scan_done, 1 * HZ);
	if (ret)
		return ret;

	/*
	 * Clear the scan status so the next scan requests will succeed. This
	 * also ensures the Rx handler doesn't do anything, as the scan was
	 * stopped from above.
	 */
	mvm->scan_status = IWL_MVM_SCAN_NONE;

	if (notify) {
		if (sched)
			ieee80211_sched_scan_stopped(mvm->hw);
		else
			ieee80211_scan_completed(mvm->hw, true);
	}

	return 0;
}

static void iwl_mvm_unified_scan_fill_tx_cmd(struct iwl_mvm *mvm,
					     struct iwl_scan_req_tx_cmd *tx_cmd,
					     bool no_cck)
{
	tx_cmd[0].tx_flags = cpu_to_le32(TX_CMD_FLG_SEQ_CTL |
					 TX_CMD_FLG_BT_DIS);
	tx_cmd[0].rate_n_flags = iwl_mvm_scan_rate_n_flags(mvm,
							   IEEE80211_BAND_2GHZ,
							   no_cck);
	tx_cmd[0].sta_id = mvm->aux_sta.sta_id;

	tx_cmd[1].tx_flags = cpu_to_le32(TX_CMD_FLG_SEQ_CTL |
					 TX_CMD_FLG_BT_DIS);
	tx_cmd[1].rate_n_flags = iwl_mvm_scan_rate_n_flags(mvm,
							   IEEE80211_BAND_5GHZ,
							   no_cck);
	tx_cmd[1].sta_id = mvm->aux_sta.sta_id;
}

static void
iwl_mvm_lmac_scan_cfg_channels(struct iwl_mvm *mvm,
			       struct ieee80211_channel **channels,
			       int n_channels, u32 ssid_bitmap,
			       struct iwl_scan_req_unified_lmac *cmd)
{
	struct iwl_scan_channel_cfg_lmac *channel_cfg = (void *)&cmd->data;
	int i;

	for (i = 0; i < n_channels; i++) {
		channel_cfg[i].channel_num =
			cpu_to_le16(channels[i]->hw_value);
		channel_cfg[i].iter_count = cpu_to_le16(1);
		channel_cfg[i].iter_interval = 0;
		channel_cfg[i].flags =
			cpu_to_le32(IWL_UNIFIED_SCAN_CHANNEL_PARTIAL |
				    ssid_bitmap);
	}
}

static void
iwl_mvm_build_unified_scan_probe(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
				 struct ieee80211_scan_ies *ies,
				 struct iwl_scan_req_unified_lmac *cmd)
{
	struct iwl_scan_probe_req *preq = (void *)(cmd->data +
		sizeof(struct iwl_scan_channel_cfg_lmac) *
			mvm->fw->ucode_capa.n_scan_channels);
	struct ieee80211_mgmt *frame = (struct ieee80211_mgmt *)preq->buf;
	u8 *pos;

	frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
	eth_broadcast_addr(frame->da);
	memcpy(frame->sa, vif->addr, ETH_ALEN);
	eth_broadcast_addr(frame->bssid);
	frame->seq_ctrl = 0;

	pos = frame->u.probe_req.variable;
	*pos++ = WLAN_EID_SSID;
	*pos++ = 0;

	preq->mac_header.offset = 0;
	preq->mac_header.len = cpu_to_le16(24 + 2);

	memcpy(pos, ies->ies[IEEE80211_BAND_2GHZ],
	       ies->len[IEEE80211_BAND_2GHZ]);
	preq->band_data[0].offset = cpu_to_le16(pos - preq->buf);
	preq->band_data[0].len = cpu_to_le16(ies->len[IEEE80211_BAND_2GHZ]);
	pos += ies->len[IEEE80211_BAND_2GHZ];

	memcpy(pos, ies->ies[IEEE80211_BAND_5GHZ],
	       ies->len[IEEE80211_BAND_5GHZ]);
	preq->band_data[1].offset = cpu_to_le16(pos - preq->buf);
	preq->band_data[1].len = cpu_to_le16(ies->len[IEEE80211_BAND_5GHZ]);
	pos += ies->len[IEEE80211_BAND_5GHZ];

	memcpy(pos, ies->common_ies, ies->common_ie_len);
	preq->common_data.offset = cpu_to_le16(pos - preq->buf);
	preq->common_data.len = cpu_to_le16(ies->common_ie_len);
}

static void
iwl_mvm_build_generic_unified_scan_cmd(struct iwl_mvm *mvm,
				       struct iwl_scan_req_unified_lmac *cmd,
				       struct iwl_mvm_scan_params *params)
{
	memset(cmd, 0, ksize(cmd));
	cmd->active_dwell = params->dwell[IEEE80211_BAND_2GHZ].active;
	cmd->passive_dwell = params->dwell[IEEE80211_BAND_2GHZ].passive;
	if (params->passive_fragmented)
		cmd->fragmented_dwell =
				params->dwell[IEEE80211_BAND_2GHZ].passive;
	cmd->rx_chain_select = iwl_mvm_scan_rx_chain(mvm);
	cmd->max_out_time = cpu_to_le32(params->max_out_time);
	cmd->suspend_time = cpu_to_le32(params->suspend_time);
	cmd->scan_prio = cpu_to_le32(IWL_SCAN_PRIORITY_HIGH);
	cmd->iter_num = cpu_to_le32(1);

	if (mvm->fw->ucode_capa.flags & IWL_UCODE_TLV_FLAGS_EBS_SUPPORT &&
	    mvm->last_ebs_successful) {
		cmd->channel_opt[0].flags =
			cpu_to_le16(IWL_SCAN_CHANNEL_FLAG_EBS |
				    IWL_SCAN_CHANNEL_FLAG_EBS_ACCURATE |
				    IWL_SCAN_CHANNEL_FLAG_CACHE_ADD);
		cmd->channel_opt[1].flags =
			cpu_to_le16(IWL_SCAN_CHANNEL_FLAG_EBS |
				    IWL_SCAN_CHANNEL_FLAG_EBS_ACCURATE |
				    IWL_SCAN_CHANNEL_FLAG_CACHE_ADD);
	}

	if (iwl_mvm_rrm_scan_needed(mvm))
		cmd->scan_flags |=
			cpu_to_le32(IWL_MVM_LMAC_SCAN_FLAGS_RRM_ENABLED);
}

int iwl_mvm_unified_scan_lmac(struct iwl_mvm *mvm,
			      struct ieee80211_vif *vif,
			      struct ieee80211_scan_request *req)
{
	struct iwl_host_cmd hcmd = {
		.id = SCAN_OFFLOAD_REQUEST_CMD,
		.len = { sizeof(struct iwl_scan_req_unified_lmac) +
			 sizeof(struct iwl_scan_channel_cfg_lmac) *
				mvm->fw->ucode_capa.n_scan_channels +
			 sizeof(struct iwl_scan_probe_req), },
		.data = { mvm->scan_cmd, },
		.dataflags = { IWL_HCMD_DFL_NOCOPY, },
	};
	struct iwl_scan_req_unified_lmac *cmd = mvm->scan_cmd;
	struct iwl_mvm_scan_params params = {};
	u32 flags;
	int ssid_bitmap = 0;
	int ret, i;

	lockdep_assert_held(&mvm->mutex);

	/* we should have failed registration if scan_cmd was NULL */
	if (WARN_ON(mvm->scan_cmd == NULL))
		return -ENOMEM;

	if (req->req.n_ssids > PROBE_OPTION_MAX ||
	    req->ies.common_ie_len + req->ies.len[NL80211_BAND_2GHZ] +
	    req->ies.len[NL80211_BAND_5GHZ] >
		iwl_mvm_max_scan_ie_fw_cmd_room(mvm, false) ||
	    req->req.n_channels > mvm->fw->ucode_capa.n_scan_channels)
		return -ENOBUFS;

	mvm->scan_status = IWL_MVM_SCAN_OS;

	iwl_mvm_scan_calc_params(mvm, vif, req->req.n_ssids, req->req.flags,
				 &params);

	iwl_mvm_build_generic_unified_scan_cmd(mvm, cmd, &params);

	cmd->n_channels = (u8)req->req.n_channels;

	flags = IWL_MVM_LMAC_SCAN_FLAG_PASS_ALL;

	if (req->req.n_ssids == 1 && req->req.ssids[0].ssid_len != 0)
		flags |= IWL_MVM_LMAC_SCAN_FLAG_PRE_CONNECTION;

	if (params.passive_fragmented)
		flags |= IWL_MVM_LMAC_SCAN_FLAG_FRAGMENTED;

	if (req->req.n_ssids == 0)
		flags |= IWL_MVM_LMAC_SCAN_FLAG_PASSIVE;

	cmd->scan_flags |= cpu_to_le32(flags);

	cmd->flags = iwl_mvm_scan_rxon_flags(req->req.channels[0]->band);
	cmd->filter_flags = cpu_to_le32(MAC_FILTER_ACCEPT_GRP |
					MAC_FILTER_IN_BEACON);
	iwl_mvm_unified_scan_fill_tx_cmd(mvm, cmd->tx_cmd, req->req.no_cck);
	iwl_mvm_scan_fill_ssids(cmd->direct_scan, req->req.ssids,
				req->req.n_ssids, 0);

	cmd->schedule[0].delay = 0;
	cmd->schedule[0].iterations = 1;
	cmd->schedule[0].full_scan_mul = 0;
	cmd->schedule[1].delay = 0;
	cmd->schedule[1].iterations = 0;
	cmd->schedule[1].full_scan_mul = 0;

	for (i = 1; i <= req->req.n_ssids; i++)
		ssid_bitmap |= BIT(i);

	iwl_mvm_lmac_scan_cfg_channels(mvm, req->req.channels,
				       req->req.n_channels, ssid_bitmap,
				       cmd);

	iwl_mvm_build_unified_scan_probe(mvm, vif, &req->ies, cmd);

	ret = iwl_mvm_send_cmd(mvm, &hcmd);
	if (!ret) {
		IWL_DEBUG_SCAN(mvm, "Scan request was sent successfully\n");
	} else {
		/*
		 * If the scan failed, it usually means that the FW was unable
		 * to allocate the time events. Warn on it, but maybe we
		 * should try to send the command again with different params.
		 */
		IWL_ERR(mvm, "Scan failed! ret %d\n", ret);
		mvm->scan_status = IWL_MVM_SCAN_NONE;
		ret = -EIO;
	}
	return ret;
}

int iwl_mvm_unified_sched_scan_lmac(struct iwl_mvm *mvm,
				    struct ieee80211_vif *vif,
				    struct cfg80211_sched_scan_request *req,
				    struct ieee80211_scan_ies *ies)
{
	struct iwl_host_cmd hcmd = {
		.id = SCAN_OFFLOAD_REQUEST_CMD,
		.len = { sizeof(struct iwl_scan_req_unified_lmac) +
			 sizeof(struct iwl_scan_channel_cfg_lmac) *
				mvm->fw->ucode_capa.n_scan_channels +
			 sizeof(struct iwl_scan_probe_req), },
		.data = { mvm->scan_cmd, },
		.dataflags = { IWL_HCMD_DFL_NOCOPY, },
	};
	struct iwl_scan_req_unified_lmac *cmd = mvm->scan_cmd;
	struct iwl_mvm_scan_params params = {};
	int ret;
	u32 flags = 0, ssid_bitmap = 0;

	lockdep_assert_held(&mvm->mutex);

	/* we should have failed registration if scan_cmd was NULL */
	if (WARN_ON(mvm->scan_cmd == NULL))
		return -ENOMEM;

	if (req->n_ssids > PROBE_OPTION_MAX ||
	    ies->common_ie_len + ies->len[NL80211_BAND_2GHZ] +
	    ies->len[NL80211_BAND_5GHZ] >
		iwl_mvm_max_scan_ie_fw_cmd_room(mvm, true) ||
	    req->n_channels > mvm->fw->ucode_capa.n_scan_channels)
		return -ENOBUFS;

	iwl_mvm_scan_calc_params(mvm, vif, req->n_ssids, 0, &params);

	iwl_mvm_build_generic_unified_scan_cmd(mvm, cmd, &params);

	cmd->n_channels = (u8)req->n_channels;

	if (req->n_match_sets && req->match_sets[0].ssid.ssid_len) {
		IWL_DEBUG_SCAN(mvm,
			       "Sending scheduled scan with filtering, n_match_sets %d\n",
			       req->n_match_sets);
	} else {
		IWL_DEBUG_SCAN(mvm,
			       "Sending Scheduled scan without filtering\n");
		flags |= IWL_MVM_LMAC_SCAN_FLAG_PASS_ALL;
	}

	if (req->n_ssids == 1 && req->ssids[0].ssid_len != 0)
		flags |= IWL_MVM_LMAC_SCAN_FLAG_PRE_CONNECTION;

	if (params.passive_fragmented)
		flags |= IWL_MVM_LMAC_SCAN_FLAG_FRAGMENTED;

	if (req->n_ssids == 0)
		flags |= IWL_MVM_LMAC_SCAN_FLAG_PASSIVE;

	cmd->scan_flags |= cpu_to_le32(flags);

	cmd->flags = iwl_mvm_scan_rxon_flags(req->channels[0]->band);
	cmd->filter_flags = cpu_to_le32(MAC_FILTER_ACCEPT_GRP |
					MAC_FILTER_IN_BEACON);
	iwl_mvm_unified_scan_fill_tx_cmd(mvm, cmd->tx_cmd, false);
	iwl_scan_offload_build_ssid(req, cmd->direct_scan, &ssid_bitmap, false);

	cmd->schedule[0].delay = cpu_to_le16(req->interval / MSEC_PER_SEC);
	cmd->schedule[0].iterations = IWL_FAST_SCHED_SCAN_ITERATIONS;
	cmd->schedule[0].full_scan_mul = 1;

	cmd->schedule[1].delay = cpu_to_le16(req->interval / MSEC_PER_SEC);
	cmd->schedule[1].iterations = 0xff;
	cmd->schedule[1].full_scan_mul = IWL_FULL_SCAN_MULTIPLIER;

	iwl_mvm_lmac_scan_cfg_channels(mvm, req->channels, req->n_channels,
				       ssid_bitmap, cmd);

	iwl_mvm_build_unified_scan_probe(mvm, vif, ies, cmd);

	ret = iwl_mvm_send_cmd(mvm, &hcmd);
	if (!ret) {
		IWL_DEBUG_SCAN(mvm,
			       "Sched scan request was sent successfully\n");
	} else {
		/*
		 * If the scan failed, it usually means that the FW was unable
		 * to allocate the time events. Warn on it, but maybe we
		 * should try to send the command again with different params.
		 */
		IWL_ERR(mvm, "Sched scan failed! ret %d\n", ret);
		mvm->scan_status = IWL_MVM_SCAN_NONE;
		ret = -EIO;
	}
	return ret;
}


int iwl_mvm_cancel_scan(struct iwl_mvm *mvm)
{
	if (mvm->scan_status == IWL_MVM_SCAN_NONE)
		return 0;

	if (iwl_mvm_is_radio_killed(mvm)) {
		ieee80211_scan_completed(mvm->hw, true);
		iwl_mvm_unref(mvm, IWL_MVM_REF_SCAN);
		mvm->scan_status = IWL_MVM_SCAN_NONE;
		return 0;
	}

	if (mvm->fw->ucode_capa.api[0] & IWL_UCODE_TLV_API_LMAC_SCAN)
		return iwl_mvm_scan_offload_stop(mvm, true);
	return iwl_mvm_cancel_regular_scan(mvm);
}