summaryrefslogtreecommitdiffstats
path: root/drivers/net/wireless/mwifiex/wmm.c
blob: ef717acec8b76f3fc45cd1b210cccd5b3948f7d7 (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
/*
 * Marvell Wireless LAN device driver: WMM
 *
 * Copyright (C) 2011-2014, Marvell International Ltd.
 *
 * This software file (the "File") is distributed by Marvell International
 * Ltd. under the terms of the GNU General Public License Version 2, June 1991
 * (the "License").  You may use, redistribute and/or modify this File in
 * accordance with the terms and conditions of the License, a copy of which
 * is available by writing to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
 * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
 *
 * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
 * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
 * this warranty disclaimer.
 */

#include "decl.h"
#include "ioctl.h"
#include "util.h"
#include "fw.h"
#include "main.h"
#include "wmm.h"
#include "11n.h"


/* Maximum value FW can accept for driver delay in packet transmission */
#define DRV_PKT_DELAY_TO_FW_MAX   512


#define WMM_QUEUED_PACKET_LOWER_LIMIT   180

#define WMM_QUEUED_PACKET_UPPER_LIMIT   200

/* Offset for TOS field in the IP header */
#define IPTOS_OFFSET 5

static bool disable_tx_amsdu;
module_param(disable_tx_amsdu, bool, 0644);

/* WMM information IE */
static const u8 wmm_info_ie[] = { WLAN_EID_VENDOR_SPECIFIC, 0x07,
	0x00, 0x50, 0xf2, 0x02,
	0x00, 0x01, 0x00
};

static const u8 wmm_aci_to_qidx_map[] = { WMM_AC_BE,
	WMM_AC_BK,
	WMM_AC_VI,
	WMM_AC_VO
};

static u8 tos_to_tid[] = {
	/* TID DSCP_P2 DSCP_P1 DSCP_P0 WMM_AC */
	0x01,			/* 0 1 0 AC_BK */
	0x02,			/* 0 0 0 AC_BK */
	0x00,			/* 0 0 1 AC_BE */
	0x03,			/* 0 1 1 AC_BE */
	0x04,			/* 1 0 0 AC_VI */
	0x05,			/* 1 0 1 AC_VI */
	0x06,			/* 1 1 0 AC_VO */
	0x07			/* 1 1 1 AC_VO */
};

static u8 ac_to_tid[4][2] = { {1, 2}, {0, 3}, {4, 5}, {6, 7} };

/*
 * This function debug prints the priority parameters for a WMM AC.
 */
static void
mwifiex_wmm_ac_debug_print(const struct ieee_types_wmm_ac_parameters *ac_param)
{
	const char *ac_str[] = { "BK", "BE", "VI", "VO" };

	pr_debug("info: WMM AC_%s: ACI=%d, ACM=%d, Aifsn=%d, "
		 "EcwMin=%d, EcwMax=%d, TxopLimit=%d\n",
		 ac_str[wmm_aci_to_qidx_map[(ac_param->aci_aifsn_bitmap
					     & MWIFIEX_ACI) >> 5]],
		 (ac_param->aci_aifsn_bitmap & MWIFIEX_ACI) >> 5,
		 (ac_param->aci_aifsn_bitmap & MWIFIEX_ACM) >> 4,
		 ac_param->aci_aifsn_bitmap & MWIFIEX_AIFSN,
		 ac_param->ecw_bitmap & MWIFIEX_ECW_MIN,
		 (ac_param->ecw_bitmap & MWIFIEX_ECW_MAX) >> 4,
		 le16_to_cpu(ac_param->tx_op_limit));
}

/*
 * This function allocates a route address list.
 *
 * The function also initializes the list with the provided RA.
 */
static struct mwifiex_ra_list_tbl *
mwifiex_wmm_allocate_ralist_node(struct mwifiex_adapter *adapter, const u8 *ra)
{
	struct mwifiex_ra_list_tbl *ra_list;

	ra_list = kzalloc(sizeof(struct mwifiex_ra_list_tbl), GFP_ATOMIC);
	if (!ra_list)
		return NULL;

	INIT_LIST_HEAD(&ra_list->list);
	skb_queue_head_init(&ra_list->skb_head);

	memcpy(ra_list->ra, ra, ETH_ALEN);

	ra_list->total_pkt_count = 0;

	dev_dbg(adapter->dev, "info: allocated ra_list %p\n", ra_list);

	return ra_list;
}

/* This function returns random no between 16 and 32 to be used as threshold
 * for no of packets after which BA setup is initiated.
 */
static u8 mwifiex_get_random_ba_threshold(void)
{
	u32 sec, usec;
	struct timeval ba_tstamp;
	u8 ba_threshold;

	/* setup ba_packet_threshold here random number between
	 * [BA_SETUP_PACKET_OFFSET,
	 * BA_SETUP_PACKET_OFFSET+BA_SETUP_MAX_PACKET_THRESHOLD-1]
	 */

	do_gettimeofday(&ba_tstamp);
	sec = (ba_tstamp.tv_sec & 0xFFFF) + (ba_tstamp.tv_sec >> 16);
	usec = (ba_tstamp.tv_usec & 0xFFFF) + (ba_tstamp.tv_usec >> 16);
	ba_threshold = (((sec << 16) + usec) % BA_SETUP_MAX_PACKET_THRESHOLD)
						      + BA_SETUP_PACKET_OFFSET;

	return ba_threshold;
}

/*
 * This function allocates and adds a RA list for all TIDs
 * with the given RA.
 */
void mwifiex_ralist_add(struct mwifiex_private *priv, const u8 *ra)
{
	int i;
	struct mwifiex_ra_list_tbl *ra_list;
	struct mwifiex_adapter *adapter = priv->adapter;
	struct mwifiex_sta_node *node;
	unsigned long flags;


	for (i = 0; i < MAX_NUM_TID; ++i) {
		ra_list = mwifiex_wmm_allocate_ralist_node(adapter, ra);
		dev_dbg(adapter->dev, "info: created ra_list %p\n", ra_list);

		if (!ra_list)
			break;

		ra_list->is_11n_enabled = 0;
		ra_list->tdls_link = false;
		if (!mwifiex_queuing_ra_based(priv)) {
			if (mwifiex_get_tdls_link_status(priv, ra) ==
			    TDLS_SETUP_COMPLETE) {
				ra_list->tdls_link = true;
				ra_list->is_11n_enabled =
					mwifiex_tdls_peer_11n_enabled(priv, ra);
			} else {
				ra_list->is_11n_enabled = IS_11N_ENABLED(priv);
			}
		} else {
			spin_lock_irqsave(&priv->sta_list_spinlock, flags);
			node = mwifiex_get_sta_entry(priv, ra);
			ra_list->is_11n_enabled =
				      mwifiex_is_sta_11n_enabled(priv, node);
			if (ra_list->is_11n_enabled)
				ra_list->max_amsdu = node->max_amsdu;
			spin_unlock_irqrestore(&priv->sta_list_spinlock, flags);
		}

		dev_dbg(adapter->dev, "data: ralist %p: is_11n_enabled=%d\n",
			ra_list, ra_list->is_11n_enabled);

		if (ra_list->is_11n_enabled) {
			ra_list->ba_pkt_count = 0;
			ra_list->ba_packet_thr =
					      mwifiex_get_random_ba_threshold();
		}
		list_add_tail(&ra_list->list,
			      &priv->wmm.tid_tbl_ptr[i].ra_list);
	}
}

/*
 * This function sets the WMM queue priorities to their default values.
 */
static void mwifiex_wmm_default_queue_priorities(struct mwifiex_private *priv)
{
	/* Default queue priorities: VO->VI->BE->BK */
	priv->wmm.queue_priority[0] = WMM_AC_VO;
	priv->wmm.queue_priority[1] = WMM_AC_VI;
	priv->wmm.queue_priority[2] = WMM_AC_BE;
	priv->wmm.queue_priority[3] = WMM_AC_BK;
}

/*
 * This function map ACs to TIDs.
 */
static void
mwifiex_wmm_queue_priorities_tid(struct mwifiex_private *priv)
{
	struct mwifiex_wmm_desc *wmm = &priv->wmm;
	u8 *queue_priority = wmm->queue_priority;
	int i;

	for (i = 0; i < 4; ++i) {
		tos_to_tid[7 - (i * 2)] = ac_to_tid[queue_priority[i]][1];
		tos_to_tid[6 - (i * 2)] = ac_to_tid[queue_priority[i]][0];
	}

	for (i = 0; i < MAX_NUM_TID; ++i)
		priv->tos_to_tid_inv[tos_to_tid[i]] = (u8)i;

	atomic_set(&wmm->highest_queued_prio, HIGH_PRIO_TID);
}

/*
 * This function initializes WMM priority queues.
 */
void
mwifiex_wmm_setup_queue_priorities(struct mwifiex_private *priv,
				   struct ieee_types_wmm_parameter *wmm_ie)
{
	u16 cw_min, avg_back_off, tmp[4];
	u32 i, j, num_ac;
	u8 ac_idx;

	if (!wmm_ie || !priv->wmm_enabled) {
		/* WMM is not enabled, just set the defaults and return */
		mwifiex_wmm_default_queue_priorities(priv);
		return;
	}

	dev_dbg(priv->adapter->dev, "info: WMM Parameter IE: version=%d, "
		"qos_info Parameter Set Count=%d, Reserved=%#x\n",
		wmm_ie->vend_hdr.version, wmm_ie->qos_info_bitmap &
		IEEE80211_WMM_IE_AP_QOSINFO_PARAM_SET_CNT_MASK,
		wmm_ie->reserved);

	for (num_ac = 0; num_ac < ARRAY_SIZE(wmm_ie->ac_params); num_ac++) {
		u8 ecw = wmm_ie->ac_params[num_ac].ecw_bitmap;
		u8 aci_aifsn = wmm_ie->ac_params[num_ac].aci_aifsn_bitmap;
		cw_min = (1 << (ecw & MWIFIEX_ECW_MIN)) - 1;
		avg_back_off = (cw_min >> 1) + (aci_aifsn & MWIFIEX_AIFSN);

		ac_idx = wmm_aci_to_qidx_map[(aci_aifsn & MWIFIEX_ACI) >> 5];
		priv->wmm.queue_priority[ac_idx] = ac_idx;
		tmp[ac_idx] = avg_back_off;

		dev_dbg(priv->adapter->dev,
			"info: WMM: CWmax=%d CWmin=%d Avg Back-off=%d\n",
			(1 << ((ecw & MWIFIEX_ECW_MAX) >> 4)) - 1,
			cw_min, avg_back_off);
		mwifiex_wmm_ac_debug_print(&wmm_ie->ac_params[num_ac]);
	}

	/* Bubble sort */
	for (i = 0; i < num_ac; i++) {
		for (j = 1; j < num_ac - i; j++) {
			if (tmp[j - 1] > tmp[j]) {
				swap(tmp[j - 1], tmp[j]);
				swap(priv->wmm.queue_priority[j - 1],
				     priv->wmm.queue_priority[j]);
			} else if (tmp[j - 1] == tmp[j]) {
				if (priv->wmm.queue_priority[j - 1]
				    < priv->wmm.queue_priority[j])
					swap(priv->wmm.queue_priority[j - 1],
					     priv->wmm.queue_priority[j]);
			}
		}
	}

	mwifiex_wmm_queue_priorities_tid(priv);
}

/*
 * This function evaluates whether or not an AC is to be downgraded.
 *
 * In case the AC is not enabled, the highest AC is returned that is
 * enabled and does not require admission control.
 */
static enum mwifiex_wmm_ac_e
mwifiex_wmm_eval_downgrade_ac(struct mwifiex_private *priv,
			      enum mwifiex_wmm_ac_e eval_ac)
{
	int down_ac;
	enum mwifiex_wmm_ac_e ret_ac;
	struct mwifiex_wmm_ac_status *ac_status;

	ac_status = &priv->wmm.ac_status[eval_ac];

	if (!ac_status->disabled)
		/* Okay to use this AC, its enabled */
		return eval_ac;

	/* Setup a default return value of the lowest priority */
	ret_ac = WMM_AC_BK;

	/*
	 *  Find the highest AC that is enabled and does not require
	 *  admission control. The spec disallows downgrading to an AC,
	 *  which is enabled due to a completed admission control.
	 *  Unadmitted traffic is not to be sent on an AC with admitted
	 *  traffic.
	 */
	for (down_ac = WMM_AC_BK; down_ac < eval_ac; down_ac++) {
		ac_status = &priv->wmm.ac_status[down_ac];

		if (!ac_status->disabled && !ac_status->flow_required)
			/* AC is enabled and does not require admission
			   control */
			ret_ac = (enum mwifiex_wmm_ac_e) down_ac;
	}

	return ret_ac;
}

/*
 * This function downgrades WMM priority queue.
 */
void
mwifiex_wmm_setup_ac_downgrade(struct mwifiex_private *priv)
{
	int ac_val;

	dev_dbg(priv->adapter->dev, "info: WMM: AC Priorities:"
			"BK(0), BE(1), VI(2), VO(3)\n");

	if (!priv->wmm_enabled) {
		/* WMM is not enabled, default priorities */
		for (ac_val = WMM_AC_BK; ac_val <= WMM_AC_VO; ac_val++)
			priv->wmm.ac_down_graded_vals[ac_val] =
						(enum mwifiex_wmm_ac_e) ac_val;
	} else {
		for (ac_val = WMM_AC_BK; ac_val <= WMM_AC_VO; ac_val++) {
			priv->wmm.ac_down_graded_vals[ac_val]
				= mwifiex_wmm_eval_downgrade_ac(priv,
						(enum mwifiex_wmm_ac_e) ac_val);
			dev_dbg(priv->adapter->dev,
				"info: WMM: AC PRIO %d maps to %d\n",
				ac_val, priv->wmm.ac_down_graded_vals[ac_val]);
		}
	}
}

/*
 * This function converts the IP TOS field to an WMM AC
 * Queue assignment.
 */
static enum mwifiex_wmm_ac_e
mwifiex_wmm_convert_tos_to_ac(struct mwifiex_adapter *adapter, u32 tos)
{
	/* Map of TOS UP values to WMM AC */
	const enum mwifiex_wmm_ac_e tos_to_ac[] = { WMM_AC_BE,
		WMM_AC_BK,
		WMM_AC_BK,
		WMM_AC_BE,
		WMM_AC_VI,
		WMM_AC_VI,
		WMM_AC_VO,
		WMM_AC_VO
	};

	if (tos >= ARRAY_SIZE(tos_to_ac))
		return WMM_AC_BE;

	return tos_to_ac[tos];
}

/*
 * This function evaluates a given TID and downgrades it to a lower
 * TID if the WMM Parameter IE received from the AP indicates that the
 * AP is disabled (due to call admission control (ACM bit). Mapping
 * of TID to AC is taken care of internally.
 */
u8 mwifiex_wmm_downgrade_tid(struct mwifiex_private *priv, u32 tid)
{
	enum mwifiex_wmm_ac_e ac, ac_down;
	u8 new_tid;

	ac = mwifiex_wmm_convert_tos_to_ac(priv->adapter, tid);
	ac_down = priv->wmm.ac_down_graded_vals[ac];

	/* Send the index to tid array, picking from the array will be
	 * taken care by dequeuing function
	 */
	new_tid = ac_to_tid[ac_down][tid % 2];

	return new_tid;
}

/*
 * This function initializes the WMM state information and the
 * WMM data path queues.
 */
void
mwifiex_wmm_init(struct mwifiex_adapter *adapter)
{
	int i, j;
	struct mwifiex_private *priv;

	for (j = 0; j < adapter->priv_num; ++j) {
		priv = adapter->priv[j];
		if (!priv)
			continue;

		for (i = 0; i < MAX_NUM_TID; ++i) {
			if (!disable_tx_amsdu &&
			    adapter->tx_buf_size > MWIFIEX_TX_DATA_BUF_SIZE_2K)
				priv->aggr_prio_tbl[i].amsdu =
							priv->tos_to_tid_inv[i];
			else
				priv->aggr_prio_tbl[i].amsdu =
							BA_STREAM_NOT_ALLOWED;
			priv->aggr_prio_tbl[i].ampdu_ap =
							priv->tos_to_tid_inv[i];
			priv->aggr_prio_tbl[i].ampdu_user =
							priv->tos_to_tid_inv[i];
		}

		mwifiex_set_ba_params(priv);
		mwifiex_reset_11n_rx_seq_num(priv);

		atomic_set(&priv->wmm.tx_pkts_queued, 0);
		atomic_set(&priv->wmm.highest_queued_prio, HIGH_PRIO_TID);
	}
}

/*
 * This function checks if WMM Tx queue is empty.
 */
int
mwifiex_wmm_lists_empty(struct mwifiex_adapter *adapter)
{
	int i;
	struct mwifiex_private *priv;

	for (i = 0; i < adapter->priv_num; ++i) {
		priv = adapter->priv[i];
		if (priv && atomic_read(&priv->wmm.tx_pkts_queued))
			return false;
	}

	return true;
}

/*
 * This function deletes all packets in an RA list node.
 *
 * The packet sent completion callback handler are called with
 * status failure, after they are dequeued to ensure proper
 * cleanup. The RA list node itself is freed at the end.
 */
static void
mwifiex_wmm_del_pkts_in_ralist_node(struct mwifiex_private *priv,
				    struct mwifiex_ra_list_tbl *ra_list)
{
	struct mwifiex_adapter *adapter = priv->adapter;
	struct sk_buff *skb, *tmp;

	skb_queue_walk_safe(&ra_list->skb_head, skb, tmp)
		mwifiex_write_data_complete(adapter, skb, 0, -1);
}

/*
 * This function deletes all packets in an RA list.
 *
 * Each nodes in the RA list are freed individually first, and then
 * the RA list itself is freed.
 */
static void
mwifiex_wmm_del_pkts_in_ralist(struct mwifiex_private *priv,
			       struct list_head *ra_list_head)
{
	struct mwifiex_ra_list_tbl *ra_list;

	list_for_each_entry(ra_list, ra_list_head, list)
		mwifiex_wmm_del_pkts_in_ralist_node(priv, ra_list);
}

/*
 * This function deletes all packets in all RA lists.
 */
static void mwifiex_wmm_cleanup_queues(struct mwifiex_private *priv)
{
	int i;

	for (i = 0; i < MAX_NUM_TID; i++)
		mwifiex_wmm_del_pkts_in_ralist(priv, &priv->wmm.tid_tbl_ptr[i].
								       ra_list);

	atomic_set(&priv->wmm.tx_pkts_queued, 0);
	atomic_set(&priv->wmm.highest_queued_prio, HIGH_PRIO_TID);
}

/*
 * This function deletes all route addresses from all RA lists.
 */
static void mwifiex_wmm_delete_all_ralist(struct mwifiex_private *priv)
{
	struct mwifiex_ra_list_tbl *ra_list, *tmp_node;
	int i;

	for (i = 0; i < MAX_NUM_TID; ++i) {
		dev_dbg(priv->adapter->dev,
			"info: ra_list: freeing buf for tid %d\n", i);
		list_for_each_entry_safe(ra_list, tmp_node,
					 &priv->wmm.tid_tbl_ptr[i].ra_list,
					 list) {
			list_del(&ra_list->list);
			kfree(ra_list);
		}

		INIT_LIST_HEAD(&priv->wmm.tid_tbl_ptr[i].ra_list);
	}
}

static int mwifiex_free_ack_frame(int id, void *p, void *data)
{
	pr_warn("Have pending ack frames!\n");
	kfree_skb(p);
	return 0;
}

/*
 * This function cleans up the Tx and Rx queues.
 *
 * Cleanup includes -
 *      - All packets in RA lists
 *      - All entries in Rx reorder table
 *      - All entries in Tx BA stream table
 *      - MPA buffer (if required)
 *      - All RA lists
 */
void
mwifiex_clean_txrx(struct mwifiex_private *priv)
{
	unsigned long flags;
	struct sk_buff *skb, *tmp;

	mwifiex_11n_cleanup_reorder_tbl(priv);
	spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);

	mwifiex_wmm_cleanup_queues(priv);
	mwifiex_11n_delete_all_tx_ba_stream_tbl(priv);

	if (priv->adapter->if_ops.cleanup_mpa_buf)
		priv->adapter->if_ops.cleanup_mpa_buf(priv->adapter);

	mwifiex_wmm_delete_all_ralist(priv);
	memcpy(tos_to_tid, ac_to_tid, sizeof(tos_to_tid));

	if (priv->adapter->if_ops.clean_pcie_ring &&
	    !priv->adapter->surprise_removed)
		priv->adapter->if_ops.clean_pcie_ring(priv->adapter);
	spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);

	skb_queue_walk_safe(&priv->tdls_txq, skb, tmp)
		mwifiex_write_data_complete(priv->adapter, skb, 0, -1);

	idr_for_each(&priv->ack_status_frames, mwifiex_free_ack_frame, NULL);
	idr_destroy(&priv->ack_status_frames);
}

/*
 * This function retrieves a particular RA list node, matching with the
 * given TID and RA address.
 */
static struct mwifiex_ra_list_tbl *
mwifiex_wmm_get_ralist_node(struct mwifiex_private *priv, u8 tid,
			    const u8 *ra_addr)
{
	struct mwifiex_ra_list_tbl *ra_list;

	list_for_each_entry(ra_list, &priv->wmm.tid_tbl_ptr[tid].ra_list,
			    list) {
		if (!memcmp(ra_list->ra, ra_addr, ETH_ALEN))
			return ra_list;
	}

	return NULL;
}

/*
 * This function retrieves an RA list node for a given TID and
 * RA address pair.
 *
 * If no such node is found, a new node is added first and then
 * retrieved.
 */
struct mwifiex_ra_list_tbl *
mwifiex_wmm_get_queue_raptr(struct mwifiex_private *priv, u8 tid,
			    const u8 *ra_addr)
{
	struct mwifiex_ra_list_tbl *ra_list;

	ra_list = mwifiex_wmm_get_ralist_node(priv, tid, ra_addr);
	if (ra_list)
		return ra_list;
	mwifiex_ralist_add(priv, ra_addr);

	return mwifiex_wmm_get_ralist_node(priv, tid, ra_addr);
}

/*
 * This function deletes RA list nodes for given mac for all TIDs.
 * Function also decrements TX pending count accordingly.
 */
void
mwifiex_wmm_del_peer_ra_list(struct mwifiex_private *priv, const u8 *ra_addr)
{
	struct mwifiex_ra_list_tbl *ra_list;
	unsigned long flags;
	int i;

	spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);

	for (i = 0; i < MAX_NUM_TID; ++i) {
		ra_list = mwifiex_wmm_get_ralist_node(priv, i, ra_addr);

		if (!ra_list)
			continue;
		mwifiex_wmm_del_pkts_in_ralist_node(priv, ra_list);
		atomic_sub(ra_list->total_pkt_count, &priv->wmm.tx_pkts_queued);
		list_del(&ra_list->list);
		kfree(ra_list);
	}
	spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
}

/*
 * This function checks if a particular RA list node exists in a given TID
 * table index.
 */
int
mwifiex_is_ralist_valid(struct mwifiex_private *priv,
			struct mwifiex_ra_list_tbl *ra_list, int ptr_index)
{
	struct mwifiex_ra_list_tbl *rlist;

	list_for_each_entry(rlist, &priv->wmm.tid_tbl_ptr[ptr_index].ra_list,
			    list) {
		if (rlist == ra_list)
			return true;
	}

	return false;
}

/*
 * This function adds a packet to WMM queue.
 *
 * In disconnected state the packet is immediately dropped and the
 * packet send completion callback is called with status failure.
 *
 * Otherwise, the correct RA list node is located and the packet
 * is queued at the list tail.
 */
void
mwifiex_wmm_add_buf_txqueue(struct mwifiex_private *priv,
			    struct sk_buff *skb)
{
	struct mwifiex_adapter *adapter = priv->adapter;
	u32 tid;
	struct mwifiex_ra_list_tbl *ra_list;
	u8 ra[ETH_ALEN], tid_down;
	unsigned long flags;
	struct list_head list_head;
	int tdls_status = TDLS_NOT_SETUP;
	struct ethhdr *eth_hdr = (struct ethhdr *)skb->data;
	struct mwifiex_txinfo *tx_info = MWIFIEX_SKB_TXCB(skb);

	memcpy(ra, eth_hdr->h_dest, ETH_ALEN);

	if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA &&
	    ISSUPP_TDLS_ENABLED(adapter->fw_cap_info)) {
		if (ntohs(eth_hdr->h_proto) == ETH_P_TDLS)
			dev_dbg(adapter->dev,
				"TDLS setup packet for %pM. Don't block\n", ra);
		else if (memcmp(priv->cfg_bssid, ra, ETH_ALEN))
			tdls_status = mwifiex_get_tdls_link_status(priv, ra);
	}

	if (!priv->media_connected && !mwifiex_is_skb_mgmt_frame(skb)) {
		dev_dbg(adapter->dev, "data: drop packet in disconnect\n");
		mwifiex_write_data_complete(adapter, skb, 0, -1);
		return;
	}

	tid = skb->priority;

	spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);

	tid_down = mwifiex_wmm_downgrade_tid(priv, tid);

	/* In case of infra as we have already created the list during
	   association we just don't have to call get_queue_raptr, we will
	   have only 1 raptr for a tid in case of infra */
	if (!mwifiex_queuing_ra_based(priv) &&
	    !mwifiex_is_skb_mgmt_frame(skb)) {
		switch (tdls_status) {
		case TDLS_SETUP_COMPLETE:
			ra_list = mwifiex_wmm_get_queue_raptr(priv, tid_down,
							      ra);
			tx_info->flags |= MWIFIEX_BUF_FLAG_TDLS_PKT;
			break;
		case TDLS_SETUP_INPROGRESS:
			skb_queue_tail(&priv->tdls_txq, skb);
			spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
					       flags);
			return;
		default:
			list_head = priv->wmm.tid_tbl_ptr[tid_down].ra_list;
			if (!list_empty(&list_head))
				ra_list = list_first_entry(
					&list_head, struct mwifiex_ra_list_tbl,
					list);
			else
				ra_list = NULL;
			break;
		}
	} else {
		memcpy(ra, skb->data, ETH_ALEN);
		if (ra[0] & 0x01 || mwifiex_is_skb_mgmt_frame(skb))
			memset(ra, 0xff, ETH_ALEN);
		ra_list = mwifiex_wmm_get_queue_raptr(priv, tid_down, ra);
	}

	if (!ra_list) {
		spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
		mwifiex_write_data_complete(adapter, skb, 0, -1);
		return;
	}

	skb_queue_tail(&ra_list->skb_head, skb);

	ra_list->ba_pkt_count++;
	ra_list->total_pkt_count++;

	if (atomic_read(&priv->wmm.highest_queued_prio) <
						priv->tos_to_tid_inv[tid_down])
		atomic_set(&priv->wmm.highest_queued_prio,
			   priv->tos_to_tid_inv[tid_down]);

	atomic_inc(&priv->wmm.tx_pkts_queued);

	spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
}

/*
 * This function processes the get WMM status command response from firmware.
 *
 * The response may contain multiple TLVs -
 *      - AC Queue status TLVs
 *      - Current WMM Parameter IE TLV
 *      - Admission Control action frame TLVs
 *
 * This function parses the TLVs and then calls further specific functions
 * to process any changes in the queue prioritize or state.
 */
int mwifiex_ret_wmm_get_status(struct mwifiex_private *priv,
			       const struct host_cmd_ds_command *resp)
{
	u8 *curr = (u8 *) &resp->params.get_wmm_status;
	uint16_t resp_len = le16_to_cpu(resp->size), tlv_len;
	bool valid = true;

	struct mwifiex_ie_types_data *tlv_hdr;
	struct mwifiex_ie_types_wmm_queue_status *tlv_wmm_qstatus;
	struct ieee_types_wmm_parameter *wmm_param_ie = NULL;
	struct mwifiex_wmm_ac_status *ac_status;

	dev_dbg(priv->adapter->dev, "info: WMM: WMM_GET_STATUS cmdresp received: %d\n",
		resp_len);

	while ((resp_len >= sizeof(tlv_hdr->header)) && valid) {
		tlv_hdr = (struct mwifiex_ie_types_data *) curr;
		tlv_len = le16_to_cpu(tlv_hdr->header.len);

		if (resp_len < tlv_len + sizeof(tlv_hdr->header))
			break;

		switch (le16_to_cpu(tlv_hdr->header.type)) {
		case TLV_TYPE_WMMQSTATUS:
			tlv_wmm_qstatus =
				(struct mwifiex_ie_types_wmm_queue_status *)
				tlv_hdr;
			dev_dbg(priv->adapter->dev,
				"info: CMD_RESP: WMM_GET_STATUS:"
				" QSTATUS TLV: %d, %d, %d\n",
				tlv_wmm_qstatus->queue_index,
				tlv_wmm_qstatus->flow_required,
				tlv_wmm_qstatus->disabled);

			ac_status = &priv->wmm.ac_status[tlv_wmm_qstatus->
							 queue_index];
			ac_status->disabled = tlv_wmm_qstatus->disabled;
			ac_status->flow_required =
						tlv_wmm_qstatus->flow_required;
			ac_status->flow_created = tlv_wmm_qstatus->flow_created;
			break;

		case WLAN_EID_VENDOR_SPECIFIC:
			/*
			 * Point the regular IEEE IE 2 bytes into the Marvell IE
			 *   and setup the IEEE IE type and length byte fields
			 */

			wmm_param_ie =
				(struct ieee_types_wmm_parameter *) (curr +
								    2);
			wmm_param_ie->vend_hdr.len = (u8) tlv_len;
			wmm_param_ie->vend_hdr.element_id =
						WLAN_EID_VENDOR_SPECIFIC;

			dev_dbg(priv->adapter->dev,
				"info: CMD_RESP: WMM_GET_STATUS:"
				" WMM Parameter Set Count: %d\n",
				wmm_param_ie->qos_info_bitmap &
				IEEE80211_WMM_IE_AP_QOSINFO_PARAM_SET_CNT_MASK);

			memcpy((u8 *) &priv->curr_bss_params.bss_descriptor.
			       wmm_ie, wmm_param_ie,
			       wmm_param_ie->vend_hdr.len + 2);

			break;

		default:
			valid = false;
			break;
		}

		curr += (tlv_len + sizeof(tlv_hdr->header));
		resp_len -= (tlv_len + sizeof(tlv_hdr->header));
	}

	mwifiex_wmm_setup_queue_priorities(priv, wmm_param_ie);
	mwifiex_wmm_setup_ac_downgrade(priv);

	return 0;
}

/*
 * Callback handler from the command module to allow insertion of a WMM TLV.
 *
 * If the BSS we are associating to supports WMM, this function adds the
 * required WMM Information IE to the association request command buffer in
 * the form of a Marvell extended IEEE IE.
 */
u32
mwifiex_wmm_process_association_req(struct mwifiex_private *priv,
				    u8 **assoc_buf,
				    struct ieee_types_wmm_parameter *wmm_ie,
				    struct ieee80211_ht_cap *ht_cap)
{
	struct mwifiex_ie_types_wmm_param_set *wmm_tlv;
	u32 ret_len = 0;

	/* Null checks */
	if (!assoc_buf)
		return 0;
	if (!(*assoc_buf))
		return 0;

	if (!wmm_ie)
		return 0;

	dev_dbg(priv->adapter->dev,
		"info: WMM: process assoc req: bss->wmm_ie=%#x\n",
		wmm_ie->vend_hdr.element_id);

	if ((priv->wmm_required ||
	     (ht_cap && (priv->adapter->config_bands & BAND_GN ||
	     priv->adapter->config_bands & BAND_AN))) &&
	    wmm_ie->vend_hdr.element_id == WLAN_EID_VENDOR_SPECIFIC) {
		wmm_tlv = (struct mwifiex_ie_types_wmm_param_set *) *assoc_buf;
		wmm_tlv->header.type = cpu_to_le16((u16) wmm_info_ie[0]);
		wmm_tlv->header.len = cpu_to_le16((u16) wmm_info_ie[1]);
		memcpy(wmm_tlv->wmm_ie, &wmm_info_ie[2],
		       le16_to_cpu(wmm_tlv->header.len));
		if (wmm_ie->qos_info_bitmap & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD)
			memcpy((u8 *) (wmm_tlv->wmm_ie
				       + le16_to_cpu(wmm_tlv->header.len)
				       - sizeof(priv->wmm_qosinfo)),
			       &priv->wmm_qosinfo, sizeof(priv->wmm_qosinfo));

		ret_len = sizeof(wmm_tlv->header)
			  + le16_to_cpu(wmm_tlv->header.len);

		*assoc_buf += ret_len;
	}

	return ret_len;
}

/*
 * This function computes the time delay in the driver queues for a
 * given packet.
 *
 * When the packet is received at the OS/Driver interface, the current
 * time is set in the packet structure. The difference between the present
 * time and that received time is computed in this function and limited
 * based on pre-compiled limits in the driver.
 */
u8
mwifiex_wmm_compute_drv_pkt_delay(struct mwifiex_private *priv,
				  const struct sk_buff *skb)
{
	u32 queue_delay = ktime_to_ms(net_timedelta(skb->tstamp));
	u8 ret_val;

	/*
	 * Queue delay is passed as a uint8 in units of 2ms (ms shifted
	 *  by 1). Min value (other than 0) is therefore 2ms, max is 510ms.
	 *
	 * Pass max value if queue_delay is beyond the uint8 range
	 */
	ret_val = (u8) (min(queue_delay, priv->wmm.drv_pkt_delay_max) >> 1);

	dev_dbg(priv->adapter->dev, "data: WMM: Pkt Delay: %d ms,"
				" %d ms sent to FW\n", queue_delay, ret_val);

	return ret_val;
}

/*
 * This function retrieves the highest priority RA list table pointer.
 */
static struct mwifiex_ra_list_tbl *
mwifiex_wmm_get_highest_priolist_ptr(struct mwifiex_adapter *adapter,
				     struct mwifiex_private **priv, int *tid)
{
	struct mwifiex_private *priv_tmp;
	struct mwifiex_ra_list_tbl *ptr;
	struct mwifiex_tid_tbl *tid_ptr;
	atomic_t *hqp;
	unsigned long flags_bss, flags_ra;
	int i, j;

	/* check the BSS with highest priority first */
	for (j = adapter->priv_num - 1; j >= 0; --j) {
		spin_lock_irqsave(&adapter->bss_prio_tbl[j].bss_prio_lock,
				  flags_bss);

		/* iterate over BSS with the equal priority */
		list_for_each_entry(adapter->bss_prio_tbl[j].bss_prio_cur,
				    &adapter->bss_prio_tbl[j].bss_prio_head,
				    list) {

			priv_tmp = adapter->bss_prio_tbl[j].bss_prio_cur->priv;

			if (atomic_read(&priv_tmp->wmm.tx_pkts_queued) == 0)
				continue;

			/* iterate over the WMM queues of the BSS */
			hqp = &priv_tmp->wmm.highest_queued_prio;
			for (i = atomic_read(hqp); i >= LOW_PRIO_TID; --i) {

				spin_lock_irqsave(&priv_tmp->wmm.
						  ra_list_spinlock, flags_ra);

				tid_ptr = &(priv_tmp)->wmm.
					tid_tbl_ptr[tos_to_tid[i]];

				/* iterate over receiver addresses */
				list_for_each_entry(ptr, &tid_ptr->ra_list,
						    list) {

					if (!skb_queue_empty(&ptr->skb_head))
						/* holds both locks */
						goto found;
				}

				spin_unlock_irqrestore(&priv_tmp->wmm.
						       ra_list_spinlock,
						       flags_ra);
			}
		}

		spin_unlock_irqrestore(&adapter->bss_prio_tbl[j].bss_prio_lock,
				       flags_bss);
	}

	return NULL;

found:
	/* holds bss_prio_lock / ra_list_spinlock */
	if (atomic_read(hqp) > i)
		atomic_set(hqp, i);
	spin_unlock_irqrestore(&priv_tmp->wmm.ra_list_spinlock, flags_ra);
	spin_unlock_irqrestore(&adapter->bss_prio_tbl[j].bss_prio_lock,
			       flags_bss);

	*priv = priv_tmp;
	*tid = tos_to_tid[i];

	return ptr;
}

/* This functions rotates ra and bss lists so packets are picked round robin.
 *
 * After a packet is successfully transmitted, rotate the ra list, so the ra
 * next to the one transmitted, will come first in the list. This way we pick
 * the ra' in a round robin fashion. Same applies to bss nodes of equal
 * priority.
 *
 * Function also increments wmm.packets_out counter.
 */
void mwifiex_rotate_priolists(struct mwifiex_private *priv,
				 struct mwifiex_ra_list_tbl *ra,
				 int tid)
{
	struct mwifiex_adapter *adapter = priv->adapter;
	struct mwifiex_bss_prio_tbl *tbl = adapter->bss_prio_tbl;
	struct mwifiex_tid_tbl *tid_ptr = &priv->wmm.tid_tbl_ptr[tid];
	unsigned long flags;

	spin_lock_irqsave(&tbl[priv->bss_priority].bss_prio_lock, flags);
	/*
	 * dirty trick: we remove 'head' temporarily and reinsert it after
	 * curr bss node. imagine list to stay fixed while head is moved
	 */
	list_move(&tbl[priv->bss_priority].bss_prio_head,
		  &tbl[priv->bss_priority].bss_prio_cur->list);
	spin_unlock_irqrestore(&tbl[priv->bss_priority].bss_prio_lock, flags);

	spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
	if (mwifiex_is_ralist_valid(priv, ra, tid)) {
		priv->wmm.packets_out[tid]++;
		/* same as above */
		list_move(&tid_ptr->ra_list, &ra->list);
	}
	spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
}

/*
 * This function checks if 11n aggregation is possible.
 */
static int
mwifiex_is_11n_aggragation_possible(struct mwifiex_private *priv,
				    struct mwifiex_ra_list_tbl *ptr,
				    int max_buf_size)
{
	int count = 0, total_size = 0;
	struct sk_buff *skb, *tmp;
	int max_amsdu_size;

	if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP && priv->ap_11n_enabled &&
	    ptr->is_11n_enabled)
		max_amsdu_size = min_t(int, ptr->max_amsdu, max_buf_size);
	else
		max_amsdu_size = max_buf_size;

	skb_queue_walk_safe(&ptr->skb_head, skb, tmp) {
		total_size += skb->len;
		if (total_size >= max_amsdu_size)
			break;
		if (++count >= MIN_NUM_AMSDU)
			return true;
	}

	return false;
}

/*
 * This function sends a single packet to firmware for transmission.
 */
static void
mwifiex_send_single_packet(struct mwifiex_private *priv,
			   struct mwifiex_ra_list_tbl *ptr, int ptr_index,
			   unsigned long ra_list_flags)
			   __releases(&priv->wmm.ra_list_spinlock)
{
	struct sk_buff *skb, *skb_next;
	struct mwifiex_tx_param tx_param;
	struct mwifiex_adapter *adapter = priv->adapter;
	struct mwifiex_txinfo *tx_info;

	if (skb_queue_empty(&ptr->skb_head)) {
		spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
				       ra_list_flags);
		dev_dbg(adapter->dev, "data: nothing to send\n");
		return;
	}

	skb = skb_dequeue(&ptr->skb_head);

	tx_info = MWIFIEX_SKB_TXCB(skb);
	dev_dbg(adapter->dev, "data: dequeuing the packet %p %p\n", ptr, skb);

	ptr->total_pkt_count--;

	if (!skb_queue_empty(&ptr->skb_head))
		skb_next = skb_peek(&ptr->skb_head);
	else
		skb_next = NULL;

	spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, ra_list_flags);

	tx_param.next_pkt_len = ((skb_next) ? skb_next->len +
				sizeof(struct txpd) : 0);

	if (mwifiex_process_tx(priv, skb, &tx_param) == -EBUSY) {
		/* Queue the packet back at the head */
		spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags);

		if (!mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
			spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
					       ra_list_flags);
			mwifiex_write_data_complete(adapter, skb, 0, -1);
			return;
		}

		skb_queue_tail(&ptr->skb_head, skb);

		ptr->total_pkt_count++;
		ptr->ba_pkt_count++;
		tx_info->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT;
		spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
				       ra_list_flags);
	} else {
		mwifiex_rotate_priolists(priv, ptr, ptr_index);
		atomic_dec(&priv->wmm.tx_pkts_queued);
	}
}

/*
 * This function checks if the first packet in the given RA list
 * is already processed or not.
 */
static int
mwifiex_is_ptr_processed(struct mwifiex_private *priv,
			 struct mwifiex_ra_list_tbl *ptr)
{
	struct sk_buff *skb;
	struct mwifiex_txinfo *tx_info;

	if (skb_queue_empty(&ptr->skb_head))
		return false;

	skb = skb_peek(&ptr->skb_head);

	tx_info = MWIFIEX_SKB_TXCB(skb);
	if (tx_info->flags & MWIFIEX_BUF_FLAG_REQUEUED_PKT)
		return true;

	return false;
}

/*
 * This function sends a single processed packet to firmware for
 * transmission.
 */
static void
mwifiex_send_processed_packet(struct mwifiex_private *priv,
			      struct mwifiex_ra_list_tbl *ptr, int ptr_index,
			      unsigned long ra_list_flags)
				__releases(&priv->wmm.ra_list_spinlock)
{
	struct mwifiex_tx_param tx_param;
	struct mwifiex_adapter *adapter = priv->adapter;
	int ret = -1;
	struct sk_buff *skb, *skb_next;
	struct mwifiex_txinfo *tx_info;

	if (skb_queue_empty(&ptr->skb_head)) {
		spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
				       ra_list_flags);
		return;
	}

	skb = skb_dequeue(&ptr->skb_head);

	if (!skb_queue_empty(&ptr->skb_head))
		skb_next = skb_peek(&ptr->skb_head);
	else
		skb_next = NULL;

	tx_info = MWIFIEX_SKB_TXCB(skb);

	spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, ra_list_flags);

	if (adapter->iface_type == MWIFIEX_USB) {
		adapter->data_sent = true;
		ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_USB_EP_DATA,
						   skb, NULL);
	} else {
		tx_param.next_pkt_len =
			((skb_next) ? skb_next->len +
			 sizeof(struct txpd) : 0);
		ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA,
						   skb, &tx_param);
	}

	switch (ret) {
	case -EBUSY:
		dev_dbg(adapter->dev, "data: -EBUSY is returned\n");
		spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags);

		if (!mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
			spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
					       ra_list_flags);
			mwifiex_write_data_complete(adapter, skb, 0, -1);
			return;
		}

		skb_queue_tail(&ptr->skb_head, skb);

		tx_info->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT;
		spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
				       ra_list_flags);
		break;
	case -1:
		if (adapter->iface_type != MWIFIEX_PCIE)
			adapter->data_sent = false;
		dev_err(adapter->dev, "host_to_card failed: %#x\n", ret);
		adapter->dbg.num_tx_host_to_card_failure++;
		mwifiex_write_data_complete(adapter, skb, 0, ret);
		break;
	case -EINPROGRESS:
		if (adapter->iface_type != MWIFIEX_PCIE)
			adapter->data_sent = false;
		break;
	case 0:
		mwifiex_write_data_complete(adapter, skb, 0, ret);
	default:
		break;
	}
	if (ret != -EBUSY) {
		mwifiex_rotate_priolists(priv, ptr, ptr_index);
		atomic_dec(&priv->wmm.tx_pkts_queued);
	}
}

/*
 * This function dequeues a packet from the highest priority list
 * and transmits it.
 */
static int
mwifiex_dequeue_tx_packet(struct mwifiex_adapter *adapter)
{
	struct mwifiex_ra_list_tbl *ptr;
	struct mwifiex_private *priv = NULL;
	int ptr_index = 0;
	u8 ra[ETH_ALEN];
	int tid_del = 0, tid = 0;
	unsigned long flags;

	ptr = mwifiex_wmm_get_highest_priolist_ptr(adapter, &priv, &ptr_index);
	if (!ptr)
		return -1;

	tid = mwifiex_get_tid(ptr);

	dev_dbg(adapter->dev, "data: tid=%d\n", tid);

	spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
	if (!mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
		spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
		return -1;
	}

	if (mwifiex_is_ptr_processed(priv, ptr)) {
		mwifiex_send_processed_packet(priv, ptr, ptr_index, flags);
		/* ra_list_spinlock has been freed in
		   mwifiex_send_processed_packet() */
		return 0;
	}

	if (!ptr->is_11n_enabled ||
	    mwifiex_is_ba_stream_setup(priv, ptr, tid) ||
	    priv->wps.session_enable) {
		if (ptr->is_11n_enabled &&
		    mwifiex_is_ba_stream_setup(priv, ptr, tid) &&
		    mwifiex_is_amsdu_in_ampdu_allowed(priv, ptr, tid) &&
		    mwifiex_is_amsdu_allowed(priv, tid) &&
		    mwifiex_is_11n_aggragation_possible(priv, ptr,
							adapter->tx_buf_size))
			mwifiex_11n_aggregate_pkt(priv, ptr, ptr_index, flags);
			/* ra_list_spinlock has been freed in
			 * mwifiex_11n_aggregate_pkt()
			 */
		else
			mwifiex_send_single_packet(priv, ptr, ptr_index, flags);
			/* ra_list_spinlock has been freed in
			 * mwifiex_send_single_packet()
			 */
	} else {
		if (mwifiex_is_ampdu_allowed(priv, ptr, tid) &&
		    ptr->ba_pkt_count > ptr->ba_packet_thr) {
			if (mwifiex_space_avail_for_new_ba_stream(adapter)) {
				mwifiex_create_ba_tbl(priv, ptr->ra, tid,
						      BA_SETUP_INPROGRESS);
				mwifiex_send_addba(priv, tid, ptr->ra);
			} else if (mwifiex_find_stream_to_delete
				   (priv, tid, &tid_del, ra)) {
				mwifiex_create_ba_tbl(priv, ptr->ra, tid,
						      BA_SETUP_INPROGRESS);
				mwifiex_send_delba(priv, tid_del, ra, 1);
			}
		}
		if (mwifiex_is_amsdu_allowed(priv, tid) &&
		    mwifiex_is_11n_aggragation_possible(priv, ptr,
							adapter->tx_buf_size))
			mwifiex_11n_aggregate_pkt(priv, ptr, ptr_index, flags);
			/* ra_list_spinlock has been freed in
			   mwifiex_11n_aggregate_pkt() */
		else
			mwifiex_send_single_packet(priv, ptr, ptr_index, flags);
			/* ra_list_spinlock has been freed in
			   mwifiex_send_single_packet() */
	}
	return 0;
}

/*
 * This function transmits the highest priority packet awaiting in the
 * WMM Queues.
 */
void
mwifiex_wmm_process_tx(struct mwifiex_adapter *adapter)
{
	do {
		/* Check if busy */
		if (adapter->data_sent || adapter->tx_lock_flag)
			break;

		if (mwifiex_dequeue_tx_packet(adapter))
			break;
	} while (!mwifiex_wmm_lists_empty(adapter));
}
OpenPOWER on IntegriCloud