aboutsummaryrefslogtreecommitdiff
path: root/drivers/net/wireless/iwlwifi/iwl-agn-rx.c
blob: 30bb5bbb0cd724055c4bb68748c06a83deba135b (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
/******************************************************************************
 *
 * Copyright(c) 2003 - 2012 Intel Corporation. All rights reserved.
 *
 * Portions of this file are derived from the ipw3945 project, as well
 * as portionhelp of the ieee80211 subsystem header files.
 *
 * 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 <linux/etherdevice.h>
#include <linux/slab.h>
#include <linux/sched.h>
#include <net/mac80211.h>
#include <asm/unaligned.h>
#include "iwl-eeprom.h"
#include "iwl-dev.h"
#include "iwl-core.h"
#include "iwl-io.h"
#include "iwl-agn-calib.h"
#include "iwl-agn.h"
#include "iwl-shared.h"

const char *get_cmd_string(u8 cmd)
{
	switch (cmd) {
		IWL_CMD(REPLY_ALIVE);
		IWL_CMD(REPLY_ERROR);
		IWL_CMD(REPLY_ECHO);
		IWL_CMD(REPLY_RXON);
		IWL_CMD(REPLY_RXON_ASSOC);
		IWL_CMD(REPLY_QOS_PARAM);
		IWL_CMD(REPLY_RXON_TIMING);
		IWL_CMD(REPLY_ADD_STA);
		IWL_CMD(REPLY_REMOVE_STA);
		IWL_CMD(REPLY_REMOVE_ALL_STA);
		IWL_CMD(REPLY_TXFIFO_FLUSH);
		IWL_CMD(REPLY_WEPKEY);
		IWL_CMD(REPLY_TX);
		IWL_CMD(REPLY_LEDS_CMD);
		IWL_CMD(REPLY_TX_LINK_QUALITY_CMD);
		IWL_CMD(COEX_PRIORITY_TABLE_CMD);
		IWL_CMD(COEX_MEDIUM_NOTIFICATION);
		IWL_CMD(COEX_EVENT_CMD);
		IWL_CMD(REPLY_QUIET_CMD);
		IWL_CMD(REPLY_CHANNEL_SWITCH);
		IWL_CMD(CHANNEL_SWITCH_NOTIFICATION);
		IWL_CMD(REPLY_SPECTRUM_MEASUREMENT_CMD);
		IWL_CMD(SPECTRUM_MEASURE_NOTIFICATION);
		IWL_CMD(POWER_TABLE_CMD);
		IWL_CMD(PM_SLEEP_NOTIFICATION);
		IWL_CMD(PM_DEBUG_STATISTIC_NOTIFIC);
		IWL_CMD(REPLY_SCAN_CMD);
		IWL_CMD(REPLY_SCAN_ABORT_CMD);
		IWL_CMD(SCAN_START_NOTIFICATION);
		IWL_CMD(SCAN_RESULTS_NOTIFICATION);
		IWL_CMD(SCAN_COMPLETE_NOTIFICATION);
		IWL_CMD(BEACON_NOTIFICATION);
		IWL_CMD(REPLY_TX_BEACON);
		IWL_CMD(WHO_IS_AWAKE_NOTIFICATION);
		IWL_CMD(QUIET_NOTIFICATION);
		IWL_CMD(REPLY_TX_PWR_TABLE_CMD);
		IWL_CMD(MEASURE_ABORT_NOTIFICATION);
		IWL_CMD(REPLY_BT_CONFIG);
		IWL_CMD(REPLY_STATISTICS_CMD);
		IWL_CMD(STATISTICS_NOTIFICATION);
		IWL_CMD(REPLY_CARD_STATE_CMD);
		IWL_CMD(CARD_STATE_NOTIFICATION);
		IWL_CMD(MISSED_BEACONS_NOTIFICATION);
		IWL_CMD(REPLY_CT_KILL_CONFIG_CMD);
		IWL_CMD(SENSITIVITY_CMD);
		IWL_CMD(REPLY_PHY_CALIBRATION_CMD);
		IWL_CMD(REPLY_RX_PHY_CMD);
		IWL_CMD(REPLY_RX_MPDU_CMD);
		IWL_CMD(REPLY_RX);
		IWL_CMD(REPLY_COMPRESSED_BA);
		IWL_CMD(CALIBRATION_CFG_CMD);
		IWL_CMD(CALIBRATION_RES_NOTIFICATION);
		IWL_CMD(CALIBRATION_COMPLETE_NOTIFICATION);
		IWL_CMD(REPLY_TX_POWER_DBM_CMD);
		IWL_CMD(TEMPERATURE_NOTIFICATION);
		IWL_CMD(TX_ANT_CONFIGURATION_CMD);
		IWL_CMD(REPLY_BT_COEX_PROFILE_NOTIF);
		IWL_CMD(REPLY_BT_COEX_PRIO_TABLE);
		IWL_CMD(REPLY_BT_COEX_PROT_ENV);
		IWL_CMD(REPLY_WIPAN_PARAMS);
		IWL_CMD(REPLY_WIPAN_RXON);
		IWL_CMD(REPLY_WIPAN_RXON_TIMING);
		IWL_CMD(REPLY_WIPAN_RXON_ASSOC);
		IWL_CMD(REPLY_WIPAN_QOS_PARAM);
		IWL_CMD(REPLY_WIPAN_WEPKEY);
		IWL_CMD(REPLY_WIPAN_P2P_CHANNEL_SWITCH);
		IWL_CMD(REPLY_WIPAN_NOA_NOTIFICATION);
		IWL_CMD(REPLY_WIPAN_DEACTIVATION_COMPLETE);
		IWL_CMD(REPLY_WOWLAN_PATTERNS);
		IWL_CMD(REPLY_WOWLAN_WAKEUP_FILTER);
		IWL_CMD(REPLY_WOWLAN_TSC_RSC_PARAMS);
		IWL_CMD(REPLY_WOWLAN_TKIP_PARAMS);
		IWL_CMD(REPLY_WOWLAN_KEK_KCK_MATERIAL);
		IWL_CMD(REPLY_WOWLAN_GET_STATUS);
		IWL_CMD(REPLY_D3_CONFIG);
	default:
		return "UNKNOWN";

	}
}

/******************************************************************************
 *
 * Generic RX handler implementations
 *
 ******************************************************************************/

static int iwlagn_rx_reply_error(struct iwl_priv *priv,
			       struct iwl_rx_mem_buffer *rxb,
			       struct iwl_device_cmd *cmd)
{
	struct iwl_rx_packet *pkt = rxb_addr(rxb);

	IWL_ERR(priv, "Error Reply type 0x%08X cmd %s (0x%02X) "
		"seq 0x%04X ser 0x%08X\n",
		le32_to_cpu(pkt->u.err_resp.error_type),
		get_cmd_string(pkt->u.err_resp.cmd_id),
		pkt->u.err_resp.cmd_id,
		le16_to_cpu(pkt->u.err_resp.bad_cmd_seq_num),
		le32_to_cpu(pkt->u.err_resp.error_info));
	return 0;
}

static int iwlagn_rx_csa(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb,
			       struct iwl_device_cmd *cmd)
{
	struct iwl_rx_packet *pkt = rxb_addr(rxb);
	struct iwl_csa_notification *csa = &(pkt->u.csa_notif);
	/*
	 * MULTI-FIXME
	 * See iwlagn_mac_channel_switch.
	 */
	struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
	struct iwl_rxon_cmd *rxon = (void *)&ctx->active;

	if (!test_bit(STATUS_CHANNEL_SWITCH_PENDING, &priv->shrd->status))
		return 0;

	if (!le32_to_cpu(csa->status) && csa->channel == priv->switch_channel) {
		rxon->channel = csa->channel;
		ctx->staging.channel = csa->channel;
		IWL_DEBUG_11H(priv, "CSA notif: channel %d\n",
			      le16_to_cpu(csa->channel));
		iwl_chswitch_done(priv, true);
	} else {
		IWL_ERR(priv, "CSA notif (fail) : channel %d\n",
			le16_to_cpu(csa->channel));
		iwl_chswitch_done(priv, false);
	}
	return 0;
}


static int iwlagn_rx_spectrum_measure_notif(struct iwl_priv *priv,
					  struct iwl_rx_mem_buffer *rxb,
					  struct iwl_device_cmd *cmd)
{
	struct iwl_rx_packet *pkt = rxb_addr(rxb);
	struct iwl_spectrum_notification *report = &(pkt->u.spectrum_notif);

	if (!report->state) {
		IWL_DEBUG_11H(priv,
			"Spectrum Measure Notification: Start\n");
		return 0;
	}

	memcpy(&priv->measure_report, report, sizeof(*report));
	priv->measurement_status |= MEASUREMENT_READY;
	return 0;
}

static int iwlagn_rx_pm_sleep_notif(struct iwl_priv *priv,
				  struct iwl_rx_mem_buffer *rxb,
				  struct iwl_device_cmd *cmd)
{
#ifdef CONFIG_IWLWIFI_DEBUG
	struct iwl_rx_packet *pkt = rxb_addr(rxb);
	struct iwl_sleep_notification *sleep = &(pkt->u.sleep_notif);
	IWL_DEBUG_RX(priv, "sleep mode: %d, src: %d\n",
		     sleep->pm_sleep_mode, sleep->pm_wakeup_src);
#endif
	return 0;
}

static int iwlagn_rx_pm_debug_statistics_notif(struct iwl_priv *priv,
					     struct iwl_rx_mem_buffer *rxb,
					     struct iwl_device_cmd *cmd)
{
	struct iwl_rx_packet *pkt = rxb_addr(rxb);
	u32 __maybe_unused len =
		le32_to_cpu(pkt->len_n_flags) & FH_RSCSR_FRAME_SIZE_MSK;
	IWL_DEBUG_RADIO(priv, "Dumping %d bytes of unhandled "
			"notification for %s:\n", len,
			get_cmd_string(pkt->hdr.cmd));
	iwl_print_hex_dump(priv, IWL_DL_RADIO, pkt->u.raw, len);
	return 0;
}

static int iwlagn_rx_beacon_notif(struct iwl_priv *priv,
				struct iwl_rx_mem_buffer *rxb,
				struct iwl_device_cmd *cmd)
{
	struct iwl_rx_packet *pkt = rxb_addr(rxb);
	struct iwlagn_beacon_notif *beacon = (void *)pkt->u.raw;
#ifdef CONFIG_IWLWIFI_DEBUG
	u16 status = le16_to_cpu(beacon->beacon_notify_hdr.status.status);
	u8 rate = iwl_hw_get_rate(beacon->beacon_notify_hdr.rate_n_flags);

	IWL_DEBUG_RX(priv, "beacon status %#x, retries:%d ibssmgr:%d "
		"tsf:0x%.8x%.8x rate:%d\n",
		status & TX_STATUS_MSK,
		beacon->beacon_notify_hdr.failure_frame,
		le32_to_cpu(beacon->ibss_mgr_status),
		le32_to_cpu(beacon->high_tsf),
		le32_to_cpu(beacon->low_tsf), rate);
#endif

	priv->ibss_manager = le32_to_cpu(beacon->ibss_mgr_status);

	return 0;
}

/* the threshold ratio of actual_ack_cnt to expected_ack_cnt in percent */
#define ACK_CNT_RATIO (50)
#define BA_TIMEOUT_CNT (5)
#define BA_TIMEOUT_MAX (16)

/**
 * iwl_good_ack_health - checks for ACK count ratios, BA timeout retries.
 *
 * When the ACK count ratio is low and aggregated BA timeout retries exceeding
 * the BA_TIMEOUT_MAX, reload firmware and bring system back to normal
 * operation state.
 */
static bool iwlagn_good_ack_health(struct iwl_priv *priv,
				struct statistics_tx *cur)
{
	int actual_delta, expected_delta, ba_timeout_delta;
	struct statistics_tx *old;

	if (priv->agg_tids_count)
		return true;

	old = &priv->statistics.tx;

	actual_delta = le32_to_cpu(cur->actual_ack_cnt) -
		       le32_to_cpu(old->actual_ack_cnt);
	expected_delta = le32_to_cpu(cur->expected_ack_cnt) -
			 le32_to_cpu(old->expected_ack_cnt);

	/* Values should not be negative, but we do not trust the firmware */
	if (actual_delta <= 0 || expected_delta <= 0)
		return true;

	ba_timeout_delta = le32_to_cpu(cur->agg.ba_timeout) -
			   le32_to_cpu(old->agg.ba_timeout);

	if ((actual_delta * 100 / expected_delta) < ACK_CNT_RATIO &&
	    ba_timeout_delta > BA_TIMEOUT_CNT) {
		IWL_DEBUG_RADIO(priv,
			"deltas: actual %d expected %d ba_timeout %d\n",
			actual_delta, expected_delta, ba_timeout_delta);

#ifdef CONFIG_IWLWIFI_DEBUGFS
		/*
		 * This is ifdef'ed on DEBUGFS because otherwise the
		 * statistics aren't available. If DEBUGFS is set but
		 * DEBUG is not, these will just compile out.
		 */
		IWL_DEBUG_RADIO(priv, "rx_detected_cnt delta %d\n",
				priv->delta_stats.tx.rx_detected_cnt);
		IWL_DEBUG_RADIO(priv,
				"ack_or_ba_timeout_collision delta %d\n",
				priv->delta_stats.tx.ack_or_ba_timeout_collision);
#endif

		if (ba_timeout_delta >= BA_TIMEOUT_MAX)
			return false;
	}

	return true;
}

/**
 * iwl_good_plcp_health - checks for plcp error.
 *
 * When the plcp error is exceeding the thresholds, reset the radio
 * to improve the throughput.
 */
static bool iwlagn_good_plcp_health(struct iwl_priv *priv,
				 struct statistics_rx_phy *cur_ofdm,
				 struct statistics_rx_ht_phy *cur_ofdm_ht,
				 unsigned int msecs)
{
	int delta;
	int threshold = cfg(priv)->base_params->plcp_delta_threshold;

	if (threshold == IWL_MAX_PLCP_ERR_THRESHOLD_DISABLE) {
		IWL_DEBUG_RADIO(priv, "plcp_err check disabled\n");
		return true;
	}

	delta = le32_to_cpu(cur_ofdm->plcp_err) -
		le32_to_cpu(priv->statistics.rx_ofdm.plcp_err) +
		le32_to_cpu(cur_ofdm_ht->plcp_err) -
		le32_to_cpu(priv->statistics.rx_ofdm_ht.plcp_err);

	/* Can be negative if firmware reset statistics */
	if (delta <= 0)
		return true;

	if ((delta * 100 / msecs) > threshold) {
		IWL_DEBUG_RADIO(priv,
				"plcp health threshold %u delta %d msecs %u\n",
				threshold, delta, msecs);
		return false;
	}

	return true;
}

static void iwlagn_recover_from_statistics(struct iwl_priv *priv,
				struct statistics_rx_phy *cur_ofdm,
				struct statistics_rx_ht_phy *cur_ofdm_ht,
				struct statistics_tx *tx,
				unsigned long stamp)
{
	unsigned int msecs;

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

	msecs = jiffies_to_msecs(stamp - priv->rx_statistics_jiffies);

	/* Only gather statistics and update time stamp when not associated */
	if (!iwl_is_any_associated(priv))
		return;

	/* Do not check/recover when do not have enough statistics data */
	if (msecs < 99)
		return;

	if (iwlagn_mod_params.ack_check && !iwlagn_good_ack_health(priv, tx)) {
		IWL_ERR(priv, "low ack count detected, restart firmware\n");
		if (!iwl_force_reset(priv, IWL_FW_RESET, false))
			return;
	}

	if (iwlagn_mod_params.plcp_check &&
	    !iwlagn_good_plcp_health(priv, cur_ofdm, cur_ofdm_ht, msecs))
		iwl_force_reset(priv, IWL_RF_RESET, false);
}

/* Calculate noise level, based on measurements during network silence just
 *   before arriving beacon.  This measurement can be done only if we know
 *   exactly when to expect beacons, therefore only when we're associated. */
static void iwlagn_rx_calc_noise(struct iwl_priv *priv)
{
	struct statistics_rx_non_phy *rx_info;
	int num_active_rx = 0;
	int total_silence = 0;
	int bcn_silence_a, bcn_silence_b, bcn_silence_c;
	int last_rx_noise;

	rx_info = &priv->statistics.rx_non_phy;

	bcn_silence_a =
		le32_to_cpu(rx_info->beacon_silence_rssi_a) & IN_BAND_FILTER;
	bcn_silence_b =
		le32_to_cpu(rx_info->beacon_silence_rssi_b) & IN_BAND_FILTER;
	bcn_silence_c =
		le32_to_cpu(rx_info->beacon_silence_rssi_c) & IN_BAND_FILTER;

	if (bcn_silence_a) {
		total_silence += bcn_silence_a;
		num_active_rx++;
	}
	if (bcn_silence_b) {
		total_silence += bcn_silence_b;
		num_active_rx++;
	}
	if (bcn_silence_c) {
		total_silence += bcn_silence_c;
		num_active_rx++;
	}

	/* Average among active antennas */
	if (num_active_rx)
		last_rx_noise = (total_silence / num_active_rx) - 107;
	else
		last_rx_noise = IWL_NOISE_MEAS_NOT_AVAILABLE;

	IWL_DEBUG_CALIB(priv, "inband silence a %u, b %u, c %u, dBm %d\n",
			bcn_silence_a, bcn_silence_b, bcn_silence_c,
			last_rx_noise);
}

#ifdef CONFIG_IWLWIFI_DEBUGFS
/*
 *  based on the assumption of all statistics counter are in DWORD
 *  FIXME: This function is for debugging, do not deal with
 *  the case of counters roll-over.
 */
static void accum_stats(__le32 *prev, __le32 *cur, __le32 *delta,
			__le32 *max_delta, __le32 *accum, int size)
{
	int i;

	for (i = 0;
	     i < size / sizeof(__le32);
	     i++, prev++, cur++, delta++, max_delta++, accum++) {
		if (le32_to_cpu(*cur) > le32_to_cpu(*prev)) {
			*delta = cpu_to_le32(
				le32_to_cpu(*cur) - le32_to_cpu(*prev));
			le32_add_cpu(accum, le32_to_cpu(*delta));
			if (le32_to_cpu(*delta) > le32_to_cpu(*max_delta))
				*max_delta = *delta;
		}
	}
}

static void
iwlagn_accumulative_statistics(struct iwl_priv *priv,
			    struct statistics_general_common *common,
			    struct statistics_rx_non_phy *rx_non_phy,
			    struct statistics_rx_phy *rx_ofdm,
			    struct statistics_rx_ht_phy *rx_ofdm_ht,
			    struct statistics_rx_phy *rx_cck,
			    struct statistics_tx *tx,
			    struct statistics_bt_activity *bt_activity)
{
#define ACCUM(_name)	\
	accum_stats((__le32 *)&priv->statistics._name,		\
		    (__le32 *)_name,				\
		    (__le32 *)&priv->delta_stats._name,		\
		    (__le32 *)&priv->max_delta_stats._name,	\
		    (__le32 *)&priv->accum_stats._name,		\
		    sizeof(*_name));

	ACCUM(common);
	ACCUM(rx_non_phy);
	ACCUM(rx_ofdm);
	ACCUM(rx_ofdm_ht);
	ACCUM(rx_cck);
	ACCUM(tx);
	if (bt_activity)
		ACCUM(bt_activity);
#undef ACCUM
}
#else
static inline void
iwlagn_accumulative_statistics(struct iwl_priv *priv,
			    struct statistics_general_common *common,
			    struct statistics_rx_non_phy *rx_non_phy,
			    struct statistics_rx_phy *rx_ofdm,
			    struct statistics_rx_ht_phy *rx_ofdm_ht,
			    struct statistics_rx_phy *rx_cck,
			    struct statistics_tx *tx,
			    struct statistics_bt_activity *bt_activity)
{
}
#endif

static int iwlagn_rx_statistics(struct iwl_priv *priv,
			      struct iwl_rx_mem_buffer *rxb,
			      struct iwl_device_cmd *cmd)
{
	unsigned long stamp = jiffies;
	const int reg_recalib_period = 60;
	int change;
	struct iwl_rx_packet *pkt = rxb_addr(rxb);
	u32 len = le32_to_cpu(pkt->len_n_flags) & FH_RSCSR_FRAME_SIZE_MSK;
	__le32 *flag;
	struct statistics_general_common *common;
	struct statistics_rx_non_phy *rx_non_phy;
	struct statistics_rx_phy *rx_ofdm;
	struct statistics_rx_ht_phy *rx_ofdm_ht;
	struct statistics_rx_phy *rx_cck;
	struct statistics_tx *tx;
	struct statistics_bt_activity *bt_activity;

	len -= sizeof(struct iwl_cmd_header); /* skip header */

	IWL_DEBUG_RX(priv, "Statistics notification received (%d bytes).\n",
		     len);

	if (len == sizeof(struct iwl_bt_notif_statistics)) {
		struct iwl_bt_notif_statistics *stats;
		stats = &pkt->u.stats_bt;
		flag = &stats->flag;
		common = &stats->general.common;
		rx_non_phy = &stats->rx.general.common;
		rx_ofdm = &stats->rx.ofdm;
		rx_ofdm_ht = &stats->rx.ofdm_ht;
		rx_cck = &stats->rx.cck;
		tx = &stats->tx;
		bt_activity = &stats->general.activity;

#ifdef CONFIG_IWLWIFI_DEBUGFS
		/* handle this exception directly */
		priv->statistics.num_bt_kills = stats->rx.general.num_bt_kills;
		le32_add_cpu(&priv->statistics.accum_num_bt_kills,
			     le32_to_cpu(stats->rx.general.num_bt_kills));
#endif
	} else if (len == sizeof(struct iwl_notif_statistics)) {
		struct iwl_notif_statistics *stats;
		stats = &pkt->u.stats;
		flag = &stats->flag;
		common = &stats->general.common;
		rx_non_phy = &stats->rx.general;
		rx_ofdm = &stats->rx.ofdm;
		rx_ofdm_ht = &stats->rx.ofdm_ht;
		rx_cck = &stats->rx.cck;
		tx = &stats->tx;
		bt_activity = NULL;
	} else {
		WARN_ONCE(1, "len %d doesn't match BT (%zu) or normal (%zu)\n",
			  len, sizeof(struct iwl_bt_notif_statistics),
			  sizeof(struct iwl_notif_statistics));
		return 0;
	}

	change = common->temperature != priv->statistics.common.temperature ||
		 (*flag & STATISTICS_REPLY_FLG_HT40_MODE_MSK) !=
		 (priv->statistics.flag & STATISTICS_REPLY_FLG_HT40_MODE_MSK);

	iwlagn_accumulative_statistics(priv, common, rx_non_phy, rx_ofdm,
				    rx_ofdm_ht, rx_cck, tx, bt_activity);

	iwlagn_recover_from_statistics(priv, rx_ofdm, rx_ofdm_ht, tx, stamp);

	priv->statistics.flag = *flag;
	memcpy(&priv->statistics.common, common, sizeof(*common));
	memcpy(&priv->statistics.rx_non_phy, rx_non_phy, sizeof(*rx_non_phy));
	memcpy(&priv->statistics.rx_ofdm, rx_ofdm, sizeof(*rx_ofdm));
	memcpy(&priv->statistics.rx_ofdm_ht, rx_ofdm_ht, sizeof(*rx_ofdm_ht));
	memcpy(&priv->statistics.rx_cck, rx_cck, sizeof(*rx_cck));
	memcpy(&priv->statistics.tx, tx, sizeof(*tx));
#ifdef CONFIG_IWLWIFI_DEBUGFS
	if (bt_activity)
		memcpy(&priv->statistics.bt_activity, bt_activity,
			sizeof(*bt_activity));
#endif

	priv->rx_statistics_jiffies = stamp;

	set_bit(STATUS_STATISTICS, &priv->shrd->status);

	/* Reschedule the statistics timer to occur in
	 * reg_recalib_period seconds to ensure we get a
	 * thermal update even if the uCode doesn't give
	 * us one */
	mod_timer(&priv->statistics_periodic, jiffies +
		  msecs_to_jiffies(reg_recalib_period * 1000));

	if (unlikely(!test_bit(STATUS_SCANNING, &priv->shrd->status)) &&
	    (pkt->hdr.cmd == STATISTICS_NOTIFICATION)) {
		iwlagn_rx_calc_noise(priv);
		queue_work(priv->workqueue, &priv->run_time_calib_work);
	}
	if (cfg(priv)->lib->temperature && change)
		cfg(priv)->lib->temperature(priv);
	return 0;
}

static int iwlagn_rx_reply_statistics(struct iwl_priv *priv,
				    struct iwl_rx_mem_buffer *rxb,
				    struct iwl_device_cmd *cmd)
{
	struct iwl_rx_packet *pkt = rxb_addr(rxb);

	if (le32_to_cpu(pkt->u.stats.flag) & UCODE_STATISTICS_CLEAR_MSK) {
#ifdef CONFIG_IWLWIFI_DEBUGFS
		memset(&priv->accum_stats, 0,
			sizeof(priv->accum_stats));
		memset(&priv->delta_stats, 0,
			sizeof(priv->delta_stats));
		memset(&priv->max_delta_stats, 0,
			sizeof(priv->max_delta_stats));
#endif
		IWL_DEBUG_RX(priv, "Statistics have been cleared\n");
	}
	iwlagn_rx_statistics(priv, rxb, cmd);
	return 0;
}

/* Handle notification from uCode that card's power state is changing
 * due to software, hardware, or critical temperature RFKILL */
static int iwlagn_rx_card_state_notif(struct iwl_priv *priv,
				    struct iwl_rx_mem_buffer *rxb,
				    struct iwl_device_cmd *cmd)
{
	struct iwl_rx_packet *pkt = rxb_addr(rxb);
	u32 flags = le32_to_cpu(pkt->u.card_state_notif.flags);
	unsigned long status = priv->shrd->status;

	IWL_DEBUG_RF_KILL(priv, "Card state received: HW:%s SW:%s CT:%s\n",
			  (flags & HW_CARD_DISABLED) ? "Kill" : "On",
			  (flags & SW_CARD_DISABLED) ? "Kill" : "On",
			  (flags & CT_CARD_DISABLED) ?
			  "Reached" : "Not reached");

	if (flags & (SW_CARD_DISABLED | HW_CARD_DISABLED |
		     CT_CARD_DISABLED)) {

		iwl_write32(trans(priv), CSR_UCODE_DRV_GP1_SET,
			    CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED);

		iwl_write_direct32(trans(priv), HBUS_TARG_MBX_C,
					HBUS_TARG_MBX_C_REG_BIT_CMD_BLOCKED);

		if (!(flags & RXON_CARD_DISABLED)) {
			iwl_write32(trans(priv), CSR_UCODE_DRV_GP1_CLR,
				    CSR_UCODE_DRV_GP1_BIT_CMD_BLOCKED);
			iwl_write_direct32(trans(priv), HBUS_TARG_MBX_C,
					HBUS_TARG_MBX_C_REG_BIT_CMD_BLOCKED);
		}
		if (flags & CT_CARD_DISABLED)
			iwl_tt_enter_ct_kill(priv);
	}
	if (!(flags & CT_CARD_DISABLED))
		iwl_tt_exit_ct_kill(priv);

	if (flags & HW_CARD_DISABLED)
		set_bit(STATUS_RF_KILL_HW, &priv->shrd->status);
	else
		clear_bit(STATUS_RF_KILL_HW, &priv->shrd->status);


	if (!(flags & RXON_CARD_DISABLED))
		iwl_scan_cancel(priv);

	if ((test_bit(STATUS_RF_KILL_HW, &status) !=
	     test_bit(STATUS_RF_KILL_HW, &priv->shrd->status)))
		wiphy_rfkill_set_hw_state(priv->hw->wiphy,
			test_bit(STATUS_RF_KILL_HW, &priv->shrd->status));
	else
		wake_up(&priv->shrd->wait_command_queue);
	return 0;
}

static int iwlagn_rx_missed_beacon_notif(struct iwl_priv *priv,
				       struct iwl_rx_mem_buffer *rxb,
				       struct iwl_device_cmd *cmd)

{
	struct iwl_rx_packet *pkt = rxb_addr(rxb);
	struct iwl_missed_beacon_notif *missed_beacon;

	missed_beacon = &pkt->u.missed_beacon;
	if (le32_to_cpu(missed_beacon->consecutive_missed_beacons) >
	    priv->missed_beacon_threshold) {
		IWL_DEBUG_CALIB(priv,
		    "missed bcn cnsq %d totl %d rcd %d expctd %d\n",
		    le32_to_cpu(missed_beacon->consecutive_missed_beacons),
		    le32_to_cpu(missed_beacon->total_missed_becons),
		    le32_to_cpu(missed_beacon->num_recvd_beacons),
		    le32_to_cpu(missed_beacon->num_expected_beacons));
		if (!test_bit(STATUS_SCANNING, &priv->shrd->status))
			iwl_init_sensitivity(priv);
	}
	return 0;
}

/* Cache phy data (Rx signal strength, etc) for HT frame (REPLY_RX_PHY_CMD).
 * This will be used later in iwl_rx_reply_rx() for REPLY_RX_MPDU_CMD. */
static int iwlagn_rx_reply_rx_phy(struct iwl_priv *priv,
				struct iwl_rx_mem_buffer *rxb,
				struct iwl_device_cmd *cmd)
{
	struct iwl_rx_packet *pkt = rxb_addr(rxb);

	priv->last_phy_res_valid = true;
	memcpy(&priv->last_phy_res, pkt->u.raw,
	       sizeof(struct iwl_rx_phy_res));
	return 0;
}

/*
 * returns non-zero if packet should be dropped
 */
static int iwlagn_set_decrypted_flag(struct iwl_priv *priv,
				  struct ieee80211_hdr *hdr,
				  u32 decrypt_res,
				  struct ieee80211_rx_status *stats)
{
	u16 fc = le16_to_cpu(hdr->frame_control);

	/*
	 * All contexts have the same setting here due to it being
	 * a module parameter, so OK to check any context.
	 */
	if (priv->contexts[IWL_RXON_CTX_BSS].active.filter_flags &
						RXON_FILTER_DIS_DECRYPT_MSK)
		return 0;

	if (!(fc & IEEE80211_FCTL_PROTECTED))
		return 0;

	IWL_DEBUG_RX(priv, "decrypt_res:0x%x\n", decrypt_res);
	switch (decrypt_res & RX_RES_STATUS_SEC_TYPE_MSK) {
	case RX_RES_STATUS_SEC_TYPE_TKIP:
		/* The uCode has got a bad phase 1 Key, pushes the packet.
		 * Decryption will be done in SW. */
		if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
		    RX_RES_STATUS_BAD_KEY_TTAK)
			break;

	case RX_RES_STATUS_SEC_TYPE_WEP:
		if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
		    RX_RES_STATUS_BAD_ICV_MIC) {
			/* bad ICV, the packet is destroyed since the
			 * decryption is inplace, drop it */
			IWL_DEBUG_RX(priv, "Packet destroyed\n");
			return -1;
		}
	case RX_RES_STATUS_SEC_TYPE_CCMP:
		if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
		    RX_RES_STATUS_DECRYPT_OK) {
			IWL_DEBUG_RX(priv, "hw decrypt successfully!!!\n");
			stats->flag |= RX_FLAG_DECRYPTED;
		}
		break;

	default:
		break;
	}
	return 0;
}

static void iwlagn_pass_packet_to_mac80211(struct iwl_priv *priv,
					struct ieee80211_hdr *hdr,
					u16 len,
					u32 ampdu_status,
					struct iwl_rx_mem_buffer *rxb,
					struct ieee80211_rx_status *stats)
{
	struct sk_buff *skb;
	__le16 fc = hdr->frame_control;
	struct iwl_rxon_context *ctx;

	/* We only process data packets if the interface is open */
	if (unlikely(!priv->is_open)) {
		IWL_DEBUG_DROP_LIMIT(priv,
		    "Dropping packet while interface is not open.\n");
		return;
	}

	/* In case of HW accelerated crypto and bad decryption, drop */
	if (!iwlagn_mod_params.sw_crypto &&
	    iwlagn_set_decrypted_flag(priv, hdr, ampdu_status, stats))
		return;

	skb = dev_alloc_skb(128);
	if (!skb) {
		IWL_ERR(priv, "dev_alloc_skb failed\n");
		return;
	}

	skb_add_rx_frag(skb, 0, rxb->page, (void *)hdr - rxb_addr(rxb), len);

	iwl_update_stats(priv, false, fc, len);

	/*
	* Wake any queues that were stopped due to a passive channel tx
	* failure. This can happen because the regulatory enforcement in
	* the device waits for a beacon before allowing transmission,
	* sometimes even after already having transmitted frames for the
	* association because the new RXON may reset the information.
	*/
	if (unlikely(ieee80211_is_beacon(fc))) {
		for_each_context(priv, ctx) {
			if (!ctx->last_tx_rejected)
				continue;
			if (compare_ether_addr(hdr->addr3,
					       ctx->active.bssid_addr))
				continue;
			ctx->last_tx_rejected = false;
			iwl_trans_wake_any_queue(trans(priv), ctx->ctxid,
				"channel got active");
		}
	}

	memcpy(IEEE80211_SKB_RXCB(skb), stats, sizeof(*stats));

	ieee80211_rx(priv->hw, skb);
	rxb->page = NULL;
}

static u32 iwlagn_translate_rx_status(struct iwl_priv *priv, u32 decrypt_in)
{
	u32 decrypt_out = 0;

	if ((decrypt_in & RX_RES_STATUS_STATION_FOUND) ==
					RX_RES_STATUS_STATION_FOUND)
		decrypt_out |= (RX_RES_STATUS_STATION_FOUND |
				RX_RES_STATUS_NO_STATION_INFO_MISMATCH);

	decrypt_out |= (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK);

	/* packet was not encrypted */
	if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
					RX_RES_STATUS_SEC_TYPE_NONE)
		return decrypt_out;

	/* packet was encrypted with unknown alg */
	if ((decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) ==
					RX_RES_STATUS_SEC_TYPE_ERR)
		return decrypt_out;

	/* decryption was not done in HW */
	if ((decrypt_in & RX_MPDU_RES_STATUS_DEC_DONE_MSK) !=
					RX_MPDU_RES_STATUS_DEC_DONE_MSK)
		return decrypt_out;

	switch (decrypt_in & RX_RES_STATUS_SEC_TYPE_MSK) {

	case RX_RES_STATUS_SEC_TYPE_CCMP:
		/* alg is CCM: check MIC only */
		if (!(decrypt_in & RX_MPDU_RES_STATUS_MIC_OK))
			/* Bad MIC */
			decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
		else
			decrypt_out |= RX_RES_STATUS_DECRYPT_OK;

		break;

	case RX_RES_STATUS_SEC_TYPE_TKIP:
		if (!(decrypt_in & RX_MPDU_RES_STATUS_TTAK_OK)) {
			/* Bad TTAK */
			decrypt_out |= RX_RES_STATUS_BAD_KEY_TTAK;
			break;
		}
		/* fall through if TTAK OK */
	default:
		if (!(decrypt_in & RX_MPDU_RES_STATUS_ICV_OK))
			decrypt_out |= RX_RES_STATUS_BAD_ICV_MIC;
		else
			decrypt_out |= RX_RES_STATUS_DECRYPT_OK;
		break;
	}

	IWL_DEBUG_RX(priv, "decrypt_in:0x%x  decrypt_out = 0x%x\n",
					decrypt_in, decrypt_out);

	return decrypt_out;
}

/* Calc max signal level (dBm) among 3 possible receivers */
static int iwlagn_calc_rssi(struct iwl_priv *priv,
			     struct iwl_rx_phy_res *rx_resp)
{
	/* data from PHY/DSP regarding signal strength, etc.,
	 *   contents are always there, not configurable by host
	 */
	struct iwlagn_non_cfg_phy *ncphy =
		(struct iwlagn_non_cfg_phy *)rx_resp->non_cfg_phy_buf;
	u32 val, rssi_a, rssi_b, rssi_c, max_rssi;
	u8 agc;

	val  = le32_to_cpu(ncphy->non_cfg_phy[IWLAGN_RX_RES_AGC_IDX]);
	agc = (val & IWLAGN_OFDM_AGC_MSK) >> IWLAGN_OFDM_AGC_BIT_POS;

	/* Find max rssi among 3 possible receivers.
	 * These values are measured by the digital signal processor (DSP).
	 * They should stay fairly constant even as the signal strength varies,
	 *   if the radio's automatic gain control (AGC) is working right.
	 * AGC value (see below) will provide the "interesting" info.
	 */
	val = le32_to_cpu(ncphy->non_cfg_phy[IWLAGN_RX_RES_RSSI_AB_IDX]);
	rssi_a = (val & IWLAGN_OFDM_RSSI_INBAND_A_BITMSK) >>
		IWLAGN_OFDM_RSSI_A_BIT_POS;
	rssi_b = (val & IWLAGN_OFDM_RSSI_INBAND_B_BITMSK) >>
		IWLAGN_OFDM_RSSI_B_BIT_POS;
	val = le32_to_cpu(ncphy->non_cfg_phy[IWLAGN_RX_RES_RSSI_C_IDX]);
	rssi_c = (val & IWLAGN_OFDM_RSSI_INBAND_C_BITMSK) >>
		IWLAGN_OFDM_RSSI_C_BIT_POS;

	max_rssi = max_t(u32, rssi_a, rssi_b);
	max_rssi = max_t(u32, max_rssi, rssi_c);

	IWL_DEBUG_STATS(priv, "Rssi In A %d B %d C %d Max %d AGC dB %d\n",
		rssi_a, rssi_b, rssi_c, max_rssi, agc);

	/* dBm = max_rssi dB - agc dB - constant.
	 * Higher AGC (higher radio gain) means lower signal. */
	return max_rssi - agc - IWLAGN_RSSI_OFFSET;
}

/* Called for REPLY_RX (legacy ABG frames), or
 * REPLY_RX_MPDU_CMD (HT high-throughput N frames). */
static int iwlagn_rx_reply_rx(struct iwl_priv *priv,
			    struct iwl_rx_mem_buffer *rxb,
			    struct iwl_device_cmd *cmd)
{
	struct ieee80211_hdr *header;
	struct ieee80211_rx_status rx_status;
	struct iwl_rx_packet *pkt = rxb_addr(rxb);
	struct iwl_rx_phy_res *phy_res;
	__le32 rx_pkt_status;
	struct iwl_rx_mpdu_res_start *amsdu;
	u32 len;
	u32 ampdu_status;
	u32 rate_n_flags;

	/**
	 * REPLY_RX and REPLY_RX_MPDU_CMD are handled differently.
	 *	REPLY_RX: physical layer info is in this buffer
	 *	REPLY_RX_MPDU_CMD: physical layer info was sent in separate
	 *		command and cached in priv->last_phy_res
	 *
	 * Here we set up local variables depending on which command is
	 * received.
	 */
	if (pkt->hdr.cmd == REPLY_RX) {
		phy_res = (struct iwl_rx_phy_res *)pkt->u.raw;
		header = (struct ieee80211_hdr *)(pkt->u.raw + sizeof(*phy_res)
				+ phy_res->cfg_phy_cnt);

		len = le16_to_cpu(phy_res->byte_count);
		rx_pkt_status = *(__le32 *)(pkt->u.raw + sizeof(*phy_res) +
				phy_res->cfg_phy_cnt + len);
		ampdu_status = le32_to_cpu(rx_pkt_status);
	} else {
		if (!priv->last_phy_res_valid) {
			IWL_ERR(priv, "MPDU frame without cached PHY data\n");
			return 0;
		}
		phy_res = &priv->last_phy_res;
		amsdu = (struct iwl_rx_mpdu_res_start *)pkt->u.raw;
		header = (struct ieee80211_hdr *)(pkt->u.raw + sizeof(*amsdu));
		len = le16_to_cpu(amsdu->byte_count);
		rx_pkt_status = *(__le32 *)(pkt->u.raw + sizeof(*amsdu) + len);
		ampdu_status = iwlagn_translate_rx_status(priv,
						le32_to_cpu(rx_pkt_status));
	}

	if ((unlikely(phy_res->cfg_phy_cnt > 20))) {
		IWL_DEBUG_DROP(priv, "dsp size out of range [0,20]: %d/n",
				phy_res->cfg_phy_cnt);
		return 0;
	}

	if (!(rx_pkt_status & RX_RES_STATUS_NO_CRC32_ERROR) ||
	    !(rx_pkt_status & RX_RES_STATUS_NO_RXE_OVERFLOW)) {
		IWL_DEBUG_RX(priv, "Bad CRC or FIFO: 0x%08X.\n",
				le32_to_cpu(rx_pkt_status));
		return 0;
	}

	/* This will be used in several places later */
	rate_n_flags = le32_to_cpu(phy_res->rate_n_flags);

	/* rx_status carries information about the packet to mac80211 */
	rx_status.mactime = le64_to_cpu(phy_res->timestamp);
	rx_status.band = (phy_res->phy_flags & RX_RES_PHY_FLAGS_BAND_24_MSK) ?
				IEEE80211_BAND_2GHZ : IEEE80211_BAND_5GHZ;
	rx_status.freq =
		ieee80211_channel_to_frequency(le16_to_cpu(phy_res->channel),
					       rx_status.band);
	rx_status.rate_idx =
		iwlagn_hwrate_to_mac80211_idx(rate_n_flags, rx_status.band);
	rx_status.flag = 0;

	/* TSF isn't reliable. In order to allow smooth user experience,
	 * this W/A doesn't propagate it to the mac80211 */
	/*rx_status.flag |= RX_FLAG_MACTIME_MPDU;*/

	priv->ucode_beacon_time = le32_to_cpu(phy_res->beacon_time_stamp);

	/* Find max signal strength (dBm) among 3 antenna/receiver chains */
	rx_status.signal = iwlagn_calc_rssi(priv, phy_res);

	iwl_dbg_log_rx_data_frame(priv, len, header);
	IWL_DEBUG_STATS_LIMIT(priv, "Rssi %d, TSF %llu\n",
		rx_status.signal, (unsigned long long)rx_status.mactime);

	/*
	 * "antenna number"
	 *
	 * It seems that the antenna field in the phy flags value
	 * is actually a bit field. This is undefined by radiotap,
	 * it wants an actual antenna number but I always get "7"
	 * for most legacy frames I receive indicating that the
	 * same frame was received on all three RX chains.
	 *
	 * I think this field should be removed in favor of a
	 * new 802.11n radiotap field "RX chains" that is defined
	 * as a bitmask.
	 */
	rx_status.antenna =
		(le16_to_cpu(phy_res->phy_flags) & RX_RES_PHY_FLAGS_ANTENNA_MSK)
		>> RX_RES_PHY_FLAGS_ANTENNA_POS;

	/* set the preamble flag if appropriate */
	if (phy_res->phy_flags & RX_RES_PHY_FLAGS_SHORT_PREAMBLE_MSK)
		rx_status.flag |= RX_FLAG_SHORTPRE;

	/* Set up the HT phy flags */
	if (rate_n_flags & RATE_MCS_HT_MSK)
		rx_status.flag |= RX_FLAG_HT;
	if (rate_n_flags & RATE_MCS_HT40_MSK)
		rx_status.flag |= RX_FLAG_40MHZ;
	if (rate_n_flags & RATE_MCS_SGI_MSK)
		rx_status.flag |= RX_FLAG_SHORT_GI;

	iwlagn_pass_packet_to_mac80211(priv, header, len, ampdu_status,
				    rxb, &rx_status);
	return 0;
}

static int iwlagn_rx_noa_notification(struct iwl_priv *priv,
				      struct iwl_rx_mem_buffer *rxb,
				      struct iwl_device_cmd *cmd)
{
	struct iwl_wipan_noa_data *new_data, *old_data;
	struct iwl_rx_packet *pkt = rxb_addr(rxb);
	struct iwl_wipan_noa_notification *noa_notif = (void *)pkt->u.raw;

	/* no condition -- we're in softirq */
	old_data = rcu_dereference_protected(priv->noa_data, true);

	if (noa_notif->noa_active) {
		u32 len = le16_to_cpu(noa_notif->noa_attribute.length);
		u32 copylen = len;

		/* EID, len, OUI, subtype */
		len += 1 + 1 + 3 + 1;
		/* P2P id, P2P length */
		len += 1 + 2;
		copylen += 1 + 2;

		new_data = kmalloc(sizeof(*new_data) + len, GFP_ATOMIC);
		if (new_data) {
			new_data->length = len;
			new_data->data[0] = WLAN_EID_VENDOR_SPECIFIC;
			new_data->data[1] = len - 2; /* not counting EID, len */
			new_data->data[2] = (WLAN_OUI_WFA >> 16) & 0xff;
			new_data->data[3] = (WLAN_OUI_WFA >> 8) & 0xff;
			new_data->data[4] = (WLAN_OUI_WFA >> 0) & 0xff;
			new_data->data[5] = WLAN_OUI_TYPE_WFA_P2P;
			memcpy(&new_data->data[6], &noa_notif->noa_attribute,
			       copylen);
		}
	} else
		new_data = NULL;

	rcu_assign_pointer(priv->noa_data, new_data);

	if (old_data)
		kfree_rcu(old_data, rcu_head);

	return 0;
}

/**
 * iwl_setup_rx_handlers - Initialize Rx handler callbacks
 *
 * Setup the RX handlers for each of the reply types sent from the uCode
 * to the host.
 */
void iwl_setup_rx_handlers(struct iwl_priv *priv)
{
	int (**handlers)(struct iwl_priv *priv, struct iwl_rx_mem_buffer *rxb,
			       struct iwl_device_cmd *cmd);

	handlers = priv->rx_handlers;

	handlers[REPLY_ERROR]			= iwlagn_rx_reply_error;
	handlers[CHANNEL_SWITCH_NOTIFICATION]	= iwlagn_rx_csa;
	handlers[SPECTRUM_MEASURE_NOTIFICATION]	=
		iwlagn_rx_spectrum_measure_notif;
	handlers[PM_SLEEP_NOTIFICATION]		= iwlagn_rx_pm_sleep_notif;
	handlers[PM_DEBUG_STATISTIC_NOTIFIC]	=
		iwlagn_rx_pm_debug_statistics_notif;
	handlers[BEACON_NOTIFICATION]		= iwlagn_rx_beacon_notif;
	handlers[REPLY_ADD_STA]			= iwl_add_sta_callback;

	handlers[REPLY_WIPAN_NOA_NOTIFICATION]	= iwlagn_rx_noa_notification;

	/*
	 * The same handler is used for both the REPLY to a discrete
	 * statistics request from the host as well as for the periodic
	 * statistics notifications (after received beacons) from the uCode.
	 */
	handlers[REPLY_STATISTICS_CMD]		= iwlagn_rx_reply_statistics;
	handlers[STATISTICS_NOTIFICATION]	= iwlagn_rx_statistics;

	iwl_setup_rx_scan_handlers(priv);

	handlers[CARD_STATE_NOTIFICATION]	= iwlagn_rx_card_state_notif;
	handlers[MISSED_BEACONS_NOTIFICATION]	=
		iwlagn_rx_missed_beacon_notif;

	/* Rx handlers */
	handlers[REPLY_RX_PHY_CMD]		= iwlagn_rx_reply_rx_phy;
	handlers[REPLY_RX_MPDU_CMD]		= iwlagn_rx_reply_rx;

	/* block ack */
	handlers[REPLY_COMPRESSED_BA]		=
		iwlagn_rx_reply_compressed_ba;

	/* init calibration handlers */
	priv->rx_handlers[CALIBRATION_RES_NOTIFICATION] =
					iwlagn_rx_calib_result;
	priv->rx_handlers[REPLY_TX] = iwlagn_rx_reply_tx;

	/* set up notification wait support */
	spin_lock_init(&priv->shrd->notif_wait_lock);
	INIT_LIST_HEAD(&priv->shrd->notif_waits);
	init_waitqueue_head(&priv->shrd->notif_waitq);

	/* Set up BT Rx handlers */
	if (cfg(priv)->lib->bt_rx_handler_setup)
		cfg(priv)->lib->bt_rx_handler_setup(priv);

}

int iwl_rx_dispatch(struct iwl_op_mode *op_mode, struct iwl_rx_mem_buffer *rxb,
		     struct iwl_device_cmd *cmd)
{
	struct iwl_rx_packet *pkt = rxb_addr(rxb);
	struct iwl_priv *priv = IWL_OP_MODE_GET_DVM(op_mode);
	int err = 0;

	/*
	 * Do the notification wait before RX handlers so
	 * even if the RX handler consumes the RXB we have
	 * access to it in the notification wait entry.
	 */
	if (!list_empty(&priv->shrd->notif_waits)) {
		struct iwl_notification_wait *w;

		spin_lock(&priv->shrd->notif_wait_lock);
		list_for_each_entry(w, &priv->shrd->notif_waits, list) {
			if (w->cmd != pkt->hdr.cmd)
				continue;
			IWL_DEBUG_RX(priv,
				"Notif: %s, 0x%02x - wake the callers up\n",
				get_cmd_string(pkt->hdr.cmd),
				pkt->hdr.cmd);
			w->triggered = true;
			if (w->fn)
				w->fn(trans(priv), pkt, w->fn_data);
		}
		spin_unlock(&priv->shrd->notif_wait_lock);

		wake_up_all(&priv->shrd->notif_waitq);
	}

	if (priv->pre_rx_handler &&
	    priv->shrd->ucode_owner == IWL_OWNERSHIP_TM)
		priv->pre_rx_handler(priv, rxb);
	else {
		/* Based on type of command response or notification,
		 *   handle those that need handling via function in
		 *   rx_handlers table.  See iwl_setup_rx_handlers() */
		if (priv->rx_handlers[pkt->hdr.cmd]) {
			priv->rx_handlers_stats[pkt->hdr.cmd]++;
			err = priv->rx_handlers[pkt->hdr.cmd] (priv, rxb, cmd);
		} else {
			/* No handling needed */
			IWL_DEBUG_RX(priv,
				"No handler needed for %s, 0x%02x\n",
				get_cmd_string(pkt->hdr.cmd), pkt->hdr.cmd);
		}
	}
	return err;
}