summaryrefslogtreecommitdiffstats
path: root/drivers/net/wireless/iwlwifi/iwl-agn-rxon.c
blob: 1c66594166216ead48f032417f34e10ea6ebd2f3 (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
/******************************************************************************
 *
 * Copyright(c) 2003 - 2011 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 LICENSE.
 *
 * Contact Information:
 * Intel Linux Wireless <ilw@linux.intel.com>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 *****************************************************************************/

#include "iwl-dev.h"
#include "iwl-agn.h"
#include "iwl-core.h"
#include "iwl-agn-calib.h"
#include "iwl-trans.h"
#include "iwl-shared.h"

static int iwlagn_disable_bss(struct iwl_priv *priv,
			      struct iwl_rxon_context *ctx,
			      struct iwl_rxon_cmd *send)
{
	__le32 old_filter = send->filter_flags;
	int ret;

	send->filter_flags &= ~RXON_FILTER_ASSOC_MSK;
	ret = iwl_trans_send_cmd_pdu(trans(priv), ctx->rxon_cmd,
				CMD_SYNC, sizeof(*send), send);

	send->filter_flags = old_filter;

	if (ret)
		IWL_DEBUG_QUIET_RFKILL(priv,
			"Error clearing ASSOC_MSK on BSS (%d)\n", ret);

	return ret;
}

static int iwlagn_disable_pan(struct iwl_priv *priv,
			      struct iwl_rxon_context *ctx,
			      struct iwl_rxon_cmd *send)
{
	struct iwl_notification_wait disable_wait;
	__le32 old_filter = send->filter_flags;
	u8 old_dev_type = send->dev_type;
	int ret;

	iwl_init_notification_wait(priv->shrd, &disable_wait,
				      REPLY_WIPAN_DEACTIVATION_COMPLETE,
				      NULL, NULL);

	send->filter_flags &= ~RXON_FILTER_ASSOC_MSK;
	send->dev_type = RXON_DEV_TYPE_P2P;
	ret = iwl_trans_send_cmd_pdu(trans(priv), ctx->rxon_cmd,
				CMD_SYNC, sizeof(*send), send);

	send->filter_flags = old_filter;
	send->dev_type = old_dev_type;

	if (ret) {
		IWL_ERR(priv, "Error disabling PAN (%d)\n", ret);
		iwl_remove_notification(priv->shrd, &disable_wait);
	} else {
		ret = iwl_wait_notification(priv->shrd, &disable_wait, HZ);
		if (ret)
			IWL_ERR(priv, "Timed out waiting for PAN disable\n");
	}

	return ret;
}

static int iwlagn_disconn_pan(struct iwl_priv *priv,
			      struct iwl_rxon_context *ctx,
			      struct iwl_rxon_cmd *send)
{
	__le32 old_filter = send->filter_flags;
	int ret;

	send->filter_flags &= ~RXON_FILTER_ASSOC_MSK;
	ret = iwl_trans_send_cmd_pdu(trans(priv), ctx->rxon_cmd, CMD_SYNC,
				sizeof(*send), send);

	send->filter_flags = old_filter;

	return ret;
}

static void iwlagn_update_qos(struct iwl_priv *priv,
			      struct iwl_rxon_context *ctx)
{
	int ret;

	if (!ctx->is_active)
		return;

	ctx->qos_data.def_qos_parm.qos_flags = 0;

	if (ctx->qos_data.qos_active)
		ctx->qos_data.def_qos_parm.qos_flags |=
			QOS_PARAM_FLG_UPDATE_EDCA_MSK;

	if (ctx->ht.enabled)
		ctx->qos_data.def_qos_parm.qos_flags |= QOS_PARAM_FLG_TGN_MSK;

	IWL_DEBUG_INFO(priv, "send QoS cmd with Qos active=%d FLAGS=0x%X\n",
		      ctx->qos_data.qos_active,
		      ctx->qos_data.def_qos_parm.qos_flags);

	ret = iwl_trans_send_cmd_pdu(trans(priv), ctx->qos_cmd, CMD_SYNC,
			       sizeof(struct iwl_qosparam_cmd),
			       &ctx->qos_data.def_qos_parm);
	if (ret)
		IWL_DEBUG_QUIET_RFKILL(priv, "Failed to update QoS\n");
}

static int iwlagn_update_beacon(struct iwl_priv *priv,
				struct ieee80211_vif *vif)
{
	lockdep_assert_held(&priv->shrd->mutex);

	dev_kfree_skb(priv->beacon_skb);
	priv->beacon_skb = ieee80211_beacon_get(priv->hw, vif);
	if (!priv->beacon_skb)
		return -ENOMEM;
	return iwlagn_send_beacon_cmd(priv);
}

static int iwlagn_send_rxon_assoc(struct iwl_priv *priv,
			   struct iwl_rxon_context *ctx)
{
	int ret = 0;
	struct iwl_rxon_assoc_cmd rxon_assoc;
	const struct iwl_rxon_cmd *rxon1 = &ctx->staging;
	const struct iwl_rxon_cmd *rxon2 = &ctx->active;

	if ((rxon1->flags == rxon2->flags) &&
	    (rxon1->filter_flags == rxon2->filter_flags) &&
	    (rxon1->cck_basic_rates == rxon2->cck_basic_rates) &&
	    (rxon1->ofdm_ht_single_stream_basic_rates ==
	     rxon2->ofdm_ht_single_stream_basic_rates) &&
	    (rxon1->ofdm_ht_dual_stream_basic_rates ==
	     rxon2->ofdm_ht_dual_stream_basic_rates) &&
	    (rxon1->ofdm_ht_triple_stream_basic_rates ==
	     rxon2->ofdm_ht_triple_stream_basic_rates) &&
	    (rxon1->acquisition_data == rxon2->acquisition_data) &&
	    (rxon1->rx_chain == rxon2->rx_chain) &&
	    (rxon1->ofdm_basic_rates == rxon2->ofdm_basic_rates)) {
		IWL_DEBUG_INFO(priv, "Using current RXON_ASSOC.  Not resending.\n");
		return 0;
	}

	rxon_assoc.flags = ctx->staging.flags;
	rxon_assoc.filter_flags = ctx->staging.filter_flags;
	rxon_assoc.ofdm_basic_rates = ctx->staging.ofdm_basic_rates;
	rxon_assoc.cck_basic_rates = ctx->staging.cck_basic_rates;
	rxon_assoc.reserved1 = 0;
	rxon_assoc.reserved2 = 0;
	rxon_assoc.reserved3 = 0;
	rxon_assoc.ofdm_ht_single_stream_basic_rates =
	    ctx->staging.ofdm_ht_single_stream_basic_rates;
	rxon_assoc.ofdm_ht_dual_stream_basic_rates =
	    ctx->staging.ofdm_ht_dual_stream_basic_rates;
	rxon_assoc.rx_chain_select_flags = ctx->staging.rx_chain;
	rxon_assoc.ofdm_ht_triple_stream_basic_rates =
		 ctx->staging.ofdm_ht_triple_stream_basic_rates;
	rxon_assoc.acquisition_data = ctx->staging.acquisition_data;

	ret = iwl_trans_send_cmd_pdu(trans(priv), ctx->rxon_assoc_cmd,
				CMD_ASYNC, sizeof(rxon_assoc), &rxon_assoc);
	return ret;
}

static int iwlagn_rxon_disconn(struct iwl_priv *priv,
			       struct iwl_rxon_context *ctx)
{
	int ret;
	struct iwl_rxon_cmd *active = (void *)&ctx->active;

	if (ctx->ctxid == IWL_RXON_CTX_BSS) {
		ret = iwlagn_disable_bss(priv, ctx, &ctx->staging);
	} else {
		ret = iwlagn_disable_pan(priv, ctx, &ctx->staging);
		if (ret)
			return ret;
		if (ctx->vif) {
			ret = iwl_send_rxon_timing(priv, ctx);
			if (ret) {
				IWL_ERR(priv, "Failed to send timing (%d)!\n", ret);
				return ret;
			}
			ret = iwlagn_disconn_pan(priv, ctx, &ctx->staging);
		}
	}
	if (ret)
		return ret;

	/*
	 * Un-assoc RXON clears the station table and WEP
	 * keys, so we have to restore those afterwards.
	 */
	iwl_clear_ucode_stations(priv, ctx);
	/* update -- might need P2P now */
	iwl_update_bcast_station(priv, ctx);
	iwl_restore_stations(priv, ctx);
	ret = iwl_restore_default_wep_keys(priv, ctx);
	if (ret) {
		IWL_ERR(priv, "Failed to restore WEP keys (%d)\n", ret);
		return ret;
	}

	memcpy(active, &ctx->staging, sizeof(*active));
	return 0;
}

static int iwlagn_rxon_connect(struct iwl_priv *priv,
			       struct iwl_rxon_context *ctx)
{
	int ret;
	struct iwl_rxon_cmd *active = (void *)&ctx->active;

	/* RXON timing must be before associated RXON */
	if (ctx->ctxid == IWL_RXON_CTX_BSS) {
		ret = iwl_send_rxon_timing(priv, ctx);
		if (ret) {
			IWL_ERR(priv, "Failed to send timing (%d)!\n", ret);
			return ret;
		}
	}
	/* QoS info may be cleared by previous un-assoc RXON */
	iwlagn_update_qos(priv, ctx);

	/*
	 * We'll run into this code path when beaconing is
	 * enabled, but then we also need to send the beacon
	 * to the device.
	 */
	if (ctx->vif && (ctx->vif->type == NL80211_IFTYPE_AP)) {
		ret = iwlagn_update_beacon(priv, ctx->vif);
		if (ret) {
			IWL_ERR(priv,
				"Error sending required beacon (%d)!\n",
				ret);
			return ret;
		}
	}

	priv->start_calib = 0;
	/*
	 * Apply the new configuration.
	 *
	 * Associated RXON doesn't clear the station table in uCode,
	 * so we don't need to restore stations etc. after this.
	 */
	ret = iwl_trans_send_cmd_pdu(trans(priv), ctx->rxon_cmd, CMD_SYNC,
		      sizeof(struct iwl_rxon_cmd), &ctx->staging);
	if (ret) {
		IWL_ERR(priv, "Error setting new RXON (%d)\n", ret);
		return ret;
	}
	memcpy(active, &ctx->staging, sizeof(*active));

	iwl_reprogram_ap_sta(priv, ctx);

	/* IBSS beacon needs to be sent after setting assoc */
	if (ctx->vif && (ctx->vif->type == NL80211_IFTYPE_ADHOC))
		if (iwlagn_update_beacon(priv, ctx->vif))
			IWL_ERR(priv, "Error sending IBSS beacon\n");
	iwl_init_sensitivity(priv);

	/*
	 * If we issue a new RXON command which required a tune then
	 * we must send a new TXPOWER command or we won't be able to
	 * Tx any frames.
	 *
	 * It's expected we set power here if channel is changing.
	 */
	ret = iwl_set_tx_power(priv, priv->tx_power_next, true);
	if (ret) {
		IWL_ERR(priv, "Error sending TX power (%d)\n", ret);
		return ret;
	}

	if (ctx->vif && ctx->vif->type == NL80211_IFTYPE_STATION &&
	    cfg(priv)->ht_params && cfg(priv)->ht_params->smps_mode)
		ieee80211_request_smps(ctx->vif,
				       cfg(priv)->ht_params->smps_mode);

	return 0;
}

int iwlagn_set_pan_params(struct iwl_priv *priv)
{
	struct iwl_wipan_params_cmd cmd;
	struct iwl_rxon_context *ctx_bss, *ctx_pan;
	int slot0 = 300, slot1 = 0;
	int ret;

	if (priv->shrd->valid_contexts == BIT(IWL_RXON_CTX_BSS))
		return 0;

	BUILD_BUG_ON(NUM_IWL_RXON_CTX != 2);

	lockdep_assert_held(&priv->shrd->mutex);

	ctx_bss = &priv->contexts[IWL_RXON_CTX_BSS];
	ctx_pan = &priv->contexts[IWL_RXON_CTX_PAN];

	/*
	 * If the PAN context is inactive, then we don't need
	 * to update the PAN parameters, the last thing we'll
	 * have done before it goes inactive is making the PAN
	 * parameters be WLAN-only.
	 */
	if (!ctx_pan->is_active)
		return 0;

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

	/* only 2 slots are currently allowed */
	cmd.num_slots = 2;

	cmd.slots[0].type = 0; /* BSS */
	cmd.slots[1].type = 1; /* PAN */

	if (priv->hw_roc_setup) {
		/* both contexts must be used for this to happen */
		slot1 = IWL_MIN_SLOT_TIME;
		slot0 = 3000;
	} else if (ctx_bss->vif && ctx_pan->vif) {
		int bcnint = ctx_pan->beacon_int;
		int dtim = ctx_pan->vif->bss_conf.dtim_period ?: 1;

		/* should be set, but seems unused?? */
		cmd.flags |= cpu_to_le16(IWL_WIPAN_PARAMS_FLG_SLOTTED_MODE);

		if (ctx_pan->vif->type == NL80211_IFTYPE_AP &&
		    bcnint &&
		    bcnint != ctx_bss->beacon_int) {
			IWL_ERR(priv,
				"beacon intervals don't match (%d, %d)\n",
				ctx_bss->beacon_int, ctx_pan->beacon_int);
		} else
			bcnint = max_t(int, bcnint,
				       ctx_bss->beacon_int);
		if (!bcnint)
			bcnint = DEFAULT_BEACON_INTERVAL;
		slot0 = bcnint / 2;
		slot1 = bcnint - slot0;

		if (test_bit(STATUS_SCAN_HW, &priv->shrd->status) ||
		    (!ctx_bss->vif->bss_conf.idle &&
		     !ctx_bss->vif->bss_conf.assoc)) {
			slot0 = dtim * bcnint * 3 - IWL_MIN_SLOT_TIME;
			slot1 = IWL_MIN_SLOT_TIME;
		} else if (!ctx_pan->vif->bss_conf.idle &&
			   !ctx_pan->vif->bss_conf.assoc) {
			slot1 = dtim * bcnint * 3 - IWL_MIN_SLOT_TIME;
			slot0 = IWL_MIN_SLOT_TIME;
		}
	} else if (ctx_pan->vif) {
		slot0 = 0;
		slot1 = max_t(int, 1, ctx_pan->vif->bss_conf.dtim_period) *
					ctx_pan->beacon_int;
		slot1 = max_t(int, DEFAULT_BEACON_INTERVAL, slot1);

		if (test_bit(STATUS_SCAN_HW, &priv->shrd->status)) {
			slot0 = slot1 * 3 - IWL_MIN_SLOT_TIME;
			slot1 = IWL_MIN_SLOT_TIME;
		}
	}

	cmd.slots[0].width = cpu_to_le16(slot0);
	cmd.slots[1].width = cpu_to_le16(slot1);

	ret = iwl_trans_send_cmd_pdu(trans(priv), REPLY_WIPAN_PARAMS, CMD_SYNC,
			sizeof(cmd), &cmd);
	if (ret)
		IWL_ERR(priv, "Error setting PAN parameters (%d)\n", ret);

	return ret;
}

/**
 * iwlagn_commit_rxon - commit staging_rxon to hardware
 *
 * The RXON command in staging_rxon is committed to the hardware and
 * the active_rxon structure is updated with the new data.  This
 * function correctly transitions out of the RXON_ASSOC_MSK state if
 * a HW tune is required based on the RXON structure changes.
 *
 * The connect/disconnect flow should be as the following:
 *
 * 1. make sure send RXON command with association bit unset if not connect
 *	this should include the channel and the band for the candidate
 *	to be connected to
 * 2. Add Station before RXON association with the AP
 * 3. RXON_timing has to send before RXON for connection
 * 4. full RXON command - associated bit set
 * 5. use RXON_ASSOC command to update any flags changes
 */
int iwlagn_commit_rxon(struct iwl_priv *priv, struct iwl_rxon_context *ctx)
{
	/* cast away the const for active_rxon in this function */
	struct iwl_rxon_cmd *active = (void *)&ctx->active;
	bool new_assoc = !!(ctx->staging.filter_flags & RXON_FILTER_ASSOC_MSK);
	int ret;

	lockdep_assert_held(&priv->shrd->mutex);

	if (test_bit(STATUS_EXIT_PENDING, &priv->shrd->status))
		return -EINVAL;

	if (!iwl_is_alive(priv->shrd))
		return -EBUSY;

	/* This function hardcodes a bunch of dual-mode assumptions */
	BUILD_BUG_ON(NUM_IWL_RXON_CTX != 2);

	if (!ctx->is_active)
		return 0;

	/* override BSSID if necessary due to preauth */
	if (ctx->preauth_bssid)
		memcpy(ctx->staging.bssid_addr, ctx->bssid, ETH_ALEN);

	/* always get timestamp with Rx frame */
	ctx->staging.flags |= RXON_FLG_TSF2HOST_MSK;

	/*
	 * force CTS-to-self frames protection if RTS-CTS is not preferred
	 * one aggregation protection method
	 */
	if (!(cfg(priv)->ht_params &&
	      cfg(priv)->ht_params->use_rts_for_aggregation))
		ctx->staging.flags |= RXON_FLG_SELF_CTS_EN;

	if ((ctx->vif && ctx->vif->bss_conf.use_short_slot) ||
	    !(ctx->staging.flags & RXON_FLG_BAND_24G_MSK))
		ctx->staging.flags |= RXON_FLG_SHORT_SLOT_MSK;
	else
		ctx->staging.flags &= ~RXON_FLG_SHORT_SLOT_MSK;

	iwl_print_rx_config_cmd(priv, ctx->ctxid);
	ret = iwl_check_rxon_cmd(priv, ctx);
	if (ret) {
		IWL_ERR(priv, "Invalid RXON configuration. Not committing.\n");
		return -EINVAL;
	}

	/*
	 * receive commit_rxon request
	 * abort any previous channel switch if still in process
	 */
	if (test_bit(STATUS_CHANNEL_SWITCH_PENDING, &priv->shrd->status) &&
	    (priv->switch_channel != ctx->staging.channel)) {
		IWL_DEBUG_11H(priv, "abort channel switch on %d\n",
			      le16_to_cpu(priv->switch_channel));
		iwl_chswitch_done(priv, false);
	}

	/*
	 * If we don't need to send a full RXON, we can use
	 * iwl_rxon_assoc_cmd which is used to reconfigure filter
	 * and other flags for the current radio configuration.
	 */
	if (!iwl_full_rxon_required(priv, ctx)) {
		ret = iwlagn_send_rxon_assoc(priv, ctx);
		if (ret) {
			IWL_ERR(priv, "Error setting RXON_ASSOC (%d)\n", ret);
			return ret;
		}

		memcpy(active, &ctx->staging, sizeof(*active));
		/*
		 * We do not commit tx power settings while channel changing,
		 * do it now if after settings changed.
		 */
		iwl_set_tx_power(priv, priv->tx_power_next, false);

		/* make sure we are in the right PS state */
		iwl_power_update_mode(priv, true);

		return 0;
	}

	iwl_set_rxon_hwcrypto(priv, ctx, !iwlagn_mod_params.sw_crypto);

	IWL_DEBUG_INFO(priv,
		       "Going to commit RXON\n"
		       "  * with%s RXON_FILTER_ASSOC_MSK\n"
		       "  * channel = %d\n"
		       "  * bssid = %pM\n",
		       (new_assoc ? "" : "out"),
		       le16_to_cpu(ctx->staging.channel),
		       ctx->staging.bssid_addr);

	/*
	 * Always clear associated first, but with the correct config.
	 * This is required as for example station addition for the
	 * AP station must be done after the BSSID is set to correctly
	 * set up filters in the device.
	 */
	ret = iwlagn_rxon_disconn(priv, ctx);
	if (ret)
		return ret;

	ret = iwlagn_set_pan_params(priv);
	if (ret)
		return ret;

	if (new_assoc)
		return iwlagn_rxon_connect(priv, ctx);

	return 0;
}

void iwlagn_config_ht40(struct ieee80211_conf *conf,
	struct iwl_rxon_context *ctx)
{
	if (conf_is_ht40_minus(conf)) {
		ctx->ht.extension_chan_offset =
			IEEE80211_HT_PARAM_CHA_SEC_BELOW;
		ctx->ht.is_40mhz = true;
	} else if (conf_is_ht40_plus(conf)) {
		ctx->ht.extension_chan_offset =
			IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
		ctx->ht.is_40mhz = true;
	} else {
		ctx->ht.extension_chan_offset =
			IEEE80211_HT_PARAM_CHA_SEC_NONE;
		ctx->ht.is_40mhz = false;
	}
}

int iwlagn_mac_config(struct ieee80211_hw *hw, u32 changed)
{
	struct iwl_priv *priv = hw->priv;
	struct iwl_rxon_context *ctx;
	struct ieee80211_conf *conf = &hw->conf;
	struct ieee80211_channel *channel = conf->channel;
	const struct iwl_channel_info *ch_info;
	int ret = 0;

	IWL_DEBUG_MAC80211(priv, "enter: changed %#x", changed);

	mutex_lock(&priv->shrd->mutex);

	if (test_bit(STATUS_EXIT_PENDING, &priv->shrd->status))
		goto out;

	if (unlikely(test_bit(STATUS_SCANNING, &priv->shrd->status))) {
		IWL_DEBUG_MAC80211(priv, "leave - scanning\n");
		goto out;
	}

	if (!iwl_is_ready(priv->shrd)) {
		IWL_DEBUG_MAC80211(priv, "leave - not ready\n");
		goto out;
	}

	if (changed & (IEEE80211_CONF_CHANGE_SMPS |
		       IEEE80211_CONF_CHANGE_CHANNEL)) {
		/* mac80211 uses static for non-HT which is what we want */
		priv->current_ht_config.smps = conf->smps_mode;

		/*
		 * Recalculate chain counts.
		 *
		 * If monitor mode is enabled then mac80211 will
		 * set up the SM PS mode to OFF if an HT channel is
		 * configured.
		 */
		for_each_context(priv, ctx)
			iwlagn_set_rxon_chain(priv, ctx);
	}

	if (changed & IEEE80211_CONF_CHANGE_CHANNEL) {
		unsigned long flags;

		ch_info = iwl_get_channel_info(priv, channel->band,
					       channel->hw_value);
		if (!is_channel_valid(ch_info)) {
			IWL_DEBUG_MAC80211(priv, "leave - invalid channel\n");
			ret = -EINVAL;
			goto out;
		}

		spin_lock_irqsave(&priv->shrd->lock, flags);

		for_each_context(priv, ctx) {
			/* Configure HT40 channels */
			if (ctx->ht.enabled != conf_is_ht(conf))
				ctx->ht.enabled = conf_is_ht(conf);

			if (ctx->ht.enabled) {
				/* if HT40 is used, it should not change
				 * after associated except channel switch */
				if (!ctx->ht.is_40mhz ||
						!iwl_is_associated_ctx(ctx))
					iwlagn_config_ht40(conf, ctx);
			} else
				ctx->ht.is_40mhz = false;

			/*
			 * Default to no protection. Protection mode will
			 * later be set from BSS config in iwl_ht_conf
			 */
			ctx->ht.protection = IEEE80211_HT_OP_MODE_PROTECTION_NONE;

			/* if we are switching from ht to 2.4 clear flags
			 * from any ht related info since 2.4 does not
			 * support ht */
			if (le16_to_cpu(ctx->staging.channel) !=
			    channel->hw_value)
				ctx->staging.flags = 0;

			iwl_set_rxon_channel(priv, channel, ctx);
			iwl_set_rxon_ht(priv, &priv->current_ht_config);

			iwl_set_flags_for_band(priv, ctx, channel->band,
					       ctx->vif);
		}

		spin_unlock_irqrestore(&priv->shrd->lock, flags);

		iwl_update_bcast_stations(priv);

		/*
		 * The list of supported rates and rate mask can be different
		 * for each band; since the band may have changed, reset
		 * the rate mask to what mac80211 lists.
		 */
		iwl_set_rate(priv);
	}

	if (changed & (IEEE80211_CONF_CHANGE_PS |
			IEEE80211_CONF_CHANGE_IDLE)) {
		ret = iwl_power_update_mode(priv, false);
		if (ret)
			IWL_DEBUG_MAC80211(priv, "Error setting sleep level\n");
	}

	if (changed & IEEE80211_CONF_CHANGE_POWER) {
		IWL_DEBUG_MAC80211(priv, "TX Power old=%d new=%d\n",
			priv->tx_power_user_lmt, conf->power_level);

		iwl_set_tx_power(priv, conf->power_level, false);
	}

	for_each_context(priv, ctx) {
		if (!memcmp(&ctx->staging, &ctx->active, sizeof(ctx->staging)))
			continue;
		iwlagn_commit_rxon(priv, ctx);
	}
 out:
	mutex_unlock(&priv->shrd->mutex);
	IWL_DEBUG_MAC80211(priv, "leave\n");

	return ret;
}

static void iwlagn_check_needed_chains(struct iwl_priv *priv,
				       struct iwl_rxon_context *ctx,
				       struct ieee80211_bss_conf *bss_conf)
{
	struct ieee80211_vif *vif = ctx->vif;
	struct iwl_rxon_context *tmp;
	struct ieee80211_sta *sta;
	struct iwl_ht_config *ht_conf = &priv->current_ht_config;
	struct ieee80211_sta_ht_cap *ht_cap;
	bool need_multiple;

	lockdep_assert_held(&priv->shrd->mutex);

	switch (vif->type) {
	case NL80211_IFTYPE_STATION:
		rcu_read_lock();
		sta = ieee80211_find_sta(vif, bss_conf->bssid);
		if (!sta) {
			/*
			 * If at all, this can only happen through a race
			 * when the AP disconnects us while we're still
			 * setting up the connection, in that case mac80211
			 * will soon tell us about that.
			 */
			need_multiple = false;
			rcu_read_unlock();
			break;
		}

		ht_cap = &sta->ht_cap;

		need_multiple = true;

		/*
		 * If the peer advertises no support for receiving 2 and 3
		 * stream MCS rates, it can't be transmitting them either.
		 */
		if (ht_cap->mcs.rx_mask[1] == 0 &&
		    ht_cap->mcs.rx_mask[2] == 0) {
			need_multiple = false;
		} else if (!(ht_cap->mcs.tx_params &
						IEEE80211_HT_MCS_TX_DEFINED)) {
			/* If it can't TX MCS at all ... */
			need_multiple = false;
		} else if (ht_cap->mcs.tx_params &
						IEEE80211_HT_MCS_TX_RX_DIFF) {
			int maxstreams;

			/*
			 * But if it can receive them, it might still not
			 * be able to transmit them, which is what we need
			 * to check here -- so check the number of streams
			 * it advertises for TX (if different from RX).
			 */

			maxstreams = (ht_cap->mcs.tx_params &
				 IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK);
			maxstreams >>=
				IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT;
			maxstreams += 1;

			if (maxstreams <= 1)
				need_multiple = false;
		}

		rcu_read_unlock();
		break;
	case NL80211_IFTYPE_ADHOC:
		/* currently */
		need_multiple = false;
		break;
	default:
		/* only AP really */
		need_multiple = true;
		break;
	}

	ctx->ht_need_multiple_chains = need_multiple;

	if (!need_multiple) {
		/* check all contexts */
		for_each_context(priv, tmp) {
			if (!tmp->vif)
				continue;
			if (tmp->ht_need_multiple_chains) {
				need_multiple = true;
				break;
			}
		}
	}

	ht_conf->single_chain_sufficient = !need_multiple;
}

static void iwlagn_chain_noise_reset(struct iwl_priv *priv)
{
	struct iwl_chain_noise_data *data = &priv->chain_noise_data;
	int ret;

	if ((data->state == IWL_CHAIN_NOISE_ALIVE) &&
	    iwl_is_any_associated(priv)) {
		struct iwl_calib_chain_noise_reset_cmd cmd;

		/* clear data for chain noise calibration algorithm */
		data->chain_noise_a = 0;
		data->chain_noise_b = 0;
		data->chain_noise_c = 0;
		data->chain_signal_a = 0;
		data->chain_signal_b = 0;
		data->chain_signal_c = 0;
		data->beacon_count = 0;

		memset(&cmd, 0, sizeof(cmd));
		iwl_set_calib_hdr(&cmd.hdr,
			priv->phy_calib_chain_noise_reset_cmd);
		ret = iwl_trans_send_cmd_pdu(trans(priv),
					REPLY_PHY_CALIBRATION_CMD,
					CMD_SYNC, sizeof(cmd), &cmd);
		if (ret)
			IWL_ERR(priv,
				"Could not send REPLY_PHY_CALIBRATION_CMD\n");
		data->state = IWL_CHAIN_NOISE_ACCUMULATE;
		IWL_DEBUG_CALIB(priv, "Run chain_noise_calibrate\n");
	}
}

void iwlagn_bss_info_changed(struct ieee80211_hw *hw,
			     struct ieee80211_vif *vif,
			     struct ieee80211_bss_conf *bss_conf,
			     u32 changes)
{
	struct iwl_priv *priv = hw->priv;
	struct iwl_rxon_context *ctx = iwl_rxon_ctx_from_vif(vif);
	int ret;
	bool force = false;

	mutex_lock(&priv->shrd->mutex);

	if (unlikely(!iwl_is_ready(priv->shrd))) {
		IWL_DEBUG_MAC80211(priv, "leave - not ready\n");
		mutex_unlock(&priv->shrd->mutex);
		return;
        }

	if (unlikely(!ctx->vif)) {
		IWL_DEBUG_MAC80211(priv, "leave - vif is NULL\n");
		mutex_unlock(&priv->shrd->mutex);
		return;
	}

	if (changes & BSS_CHANGED_BEACON_INT)
		force = true;

	if (changes & BSS_CHANGED_QOS) {
		ctx->qos_data.qos_active = bss_conf->qos;
		iwlagn_update_qos(priv, ctx);
	}

	ctx->staging.assoc_id = cpu_to_le16(vif->bss_conf.aid);
	if (vif->bss_conf.use_short_preamble)
		ctx->staging.flags |= RXON_FLG_SHORT_PREAMBLE_MSK;
	else
		ctx->staging.flags &= ~RXON_FLG_SHORT_PREAMBLE_MSK;

	if (changes & BSS_CHANGED_ASSOC) {
		if (bss_conf->assoc) {
			priv->timestamp = bss_conf->timestamp;
			ctx->staging.filter_flags |= RXON_FILTER_ASSOC_MSK;
		} else {
			/*
			 * If we disassociate while there are pending
			 * frames, just wake up the queues and let the
			 * frames "escape" ... This shouldn't really
			 * be happening to start with, but we should
			 * not get stuck in this case either since it
			 * can happen if userspace gets confused.
			 */
			if (ctx->last_tx_rejected) {
				ctx->last_tx_rejected = false;
				iwl_trans_wake_any_queue(trans(priv),
							 ctx->ctxid,
							 "Disassoc: flush queue");
			}
			ctx->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;

			if (ctx->ctxid == IWL_RXON_CTX_BSS)
				priv->have_rekey_data = false;
		}

		iwlagn_bt_coex_rssi_monitor(priv);
	}

	if (ctx->ht.enabled) {
		ctx->ht.protection = bss_conf->ht_operation_mode &
					IEEE80211_HT_OP_MODE_PROTECTION;
		ctx->ht.non_gf_sta_present = !!(bss_conf->ht_operation_mode &
					IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT);
		iwlagn_check_needed_chains(priv, ctx, bss_conf);
		iwl_set_rxon_ht(priv, &priv->current_ht_config);
	}

	iwlagn_set_rxon_chain(priv, ctx);

	if (bss_conf->use_cts_prot && (priv->band != IEEE80211_BAND_5GHZ))
		ctx->staging.flags |= RXON_FLG_TGG_PROTECT_MSK;
	else
		ctx->staging.flags &= ~RXON_FLG_TGG_PROTECT_MSK;

	if (bss_conf->use_cts_prot)
		ctx->staging.flags |= RXON_FLG_SELF_CTS_EN;
	else
		ctx->staging.flags &= ~RXON_FLG_SELF_CTS_EN;

	memcpy(ctx->staging.bssid_addr, bss_conf->bssid, ETH_ALEN);

	if (vif->type == NL80211_IFTYPE_AP ||
	    vif->type == NL80211_IFTYPE_ADHOC) {
		if (vif->bss_conf.enable_beacon) {
			ctx->staging.filter_flags |= RXON_FILTER_ASSOC_MSK;
			priv->beacon_ctx = ctx;
		} else {
			ctx->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
			priv->beacon_ctx = NULL;
		}
	}

	if (force || memcmp(&ctx->staging, &ctx->active, sizeof(ctx->staging)))
		iwlagn_commit_rxon(priv, ctx);

	if (changes & BSS_CHANGED_ASSOC && bss_conf->assoc) {
		/*
		 * The chain noise calibration will enable PM upon
		 * completion. If calibration has already been run
		 * then we need to enable power management here.
		 */
		if (priv->chain_noise_data.state == IWL_CHAIN_NOISE_DONE)
			iwl_power_update_mode(priv, false);

		/* Enable RX differential gain and sensitivity calibrations */
		if (!priv->disable_chain_noise_cal)
			iwlagn_chain_noise_reset(priv);
		priv->start_calib = 1;
		WARN_ON(ctx->preauth_bssid);
	}

	if (changes & BSS_CHANGED_IBSS) {
		ret = iwlagn_manage_ibss_station(priv, vif,
						 bss_conf->ibss_joined);
		if (ret)
			IWL_ERR(priv, "failed to %s IBSS station %pM\n",
				bss_conf->ibss_joined ? "add" : "remove",
				bss_conf->bssid);
	}

	if (changes & BSS_CHANGED_BEACON && vif->type == NL80211_IFTYPE_ADHOC &&
	    priv->beacon_ctx) {
		if (iwlagn_update_beacon(priv, vif))
			IWL_ERR(priv, "Error sending IBSS beacon\n");
	}

	mutex_unlock(&priv->shrd->mutex);
}

void iwlagn_post_scan(struct iwl_priv *priv)
{
	struct iwl_rxon_context *ctx;

	/*
	 * We do not commit power settings while scan is pending,
	 * do it now if the settings changed.
	 */
	iwl_power_set_mode(priv, &priv->power_data.sleep_cmd_next, false);
	iwl_set_tx_power(priv, priv->tx_power_next, false);

	/*
	 * Since setting the RXON may have been deferred while
	 * performing the scan, fire one off if needed
	 */
	for_each_context(priv, ctx)
		if (memcmp(&ctx->staging, &ctx->active, sizeof(ctx->staging)))
			iwlagn_commit_rxon(priv, ctx);

	iwlagn_set_pan_params(priv);
}