summaryrefslogtreecommitdiffstats
path: root/drivers/net/wireless/mwifiex/11n_rxreorder.c
blob: 5ef5a0eeba50eb682d30e5879f565ac48ad217e4 (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
/*
 * Marvell Wireless LAN device driver: 802.11n RX Re-ordering
 *
 * 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"
#include "11n_rxreorder.h"

/* This function will dispatch amsdu packet and forward it to kernel/upper
 * layer.
 */
static int mwifiex_11n_dispatch_amsdu_pkt(struct mwifiex_private *priv,
					  struct sk_buff *skb)
{
	struct rxpd *local_rx_pd = (struct rxpd *)(skb->data);
	int ret;

	if (le16_to_cpu(local_rx_pd->rx_pkt_type) == PKT_TYPE_AMSDU) {
		struct sk_buff_head list;
		struct sk_buff *rx_skb;

		__skb_queue_head_init(&list);

		skb_pull(skb, le16_to_cpu(local_rx_pd->rx_pkt_offset));
		skb_trim(skb, le16_to_cpu(local_rx_pd->rx_pkt_length));

		ieee80211_amsdu_to_8023s(skb, &list, priv->curr_addr,
					 priv->wdev->iftype, 0, false);

		while (!skb_queue_empty(&list)) {
			rx_skb = __skb_dequeue(&list);
			ret = mwifiex_recv_packet(priv, rx_skb);
			if (ret == -1)
				dev_err(priv->adapter->dev,
					"Rx of A-MSDU failed");
		}
		return 0;
	}

	return -1;
}

/* This function will process the rx packet and forward it to kernel/upper
 * layer.
 */
static int mwifiex_11n_dispatch_pkt(struct mwifiex_private *priv, void *payload)
{
	int ret = mwifiex_11n_dispatch_amsdu_pkt(priv, payload);

	if (!ret)
		return 0;

	if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP)
		return mwifiex_handle_uap_rx_forward(priv, payload);

	return mwifiex_process_rx_packet(priv, payload);
}

/*
 * This function dispatches all packets in the Rx reorder table until the
 * start window.
 *
 * There could be holes in the buffer, which are skipped by the function.
 * Since the buffer is linear, the function uses rotation to simulate
 * circular buffer.
 */
static void
mwifiex_11n_dispatch_pkt_until_start_win(struct mwifiex_private *priv,
					 struct mwifiex_rx_reorder_tbl *tbl,
					 int start_win)
{
	int pkt_to_send, i;
	void *rx_tmp_ptr;
	unsigned long flags;

	pkt_to_send = (start_win > tbl->start_win) ?
		      min((start_win - tbl->start_win), tbl->win_size) :
		      tbl->win_size;

	for (i = 0; i < pkt_to_send; ++i) {
		spin_lock_irqsave(&priv->rx_pkt_lock, flags);
		rx_tmp_ptr = NULL;
		if (tbl->rx_reorder_ptr[i]) {
			rx_tmp_ptr = tbl->rx_reorder_ptr[i];
			tbl->rx_reorder_ptr[i] = NULL;
		}
		spin_unlock_irqrestore(&priv->rx_pkt_lock, flags);
		if (rx_tmp_ptr)
			mwifiex_11n_dispatch_pkt(priv, rx_tmp_ptr);
	}

	spin_lock_irqsave(&priv->rx_pkt_lock, flags);
	/*
	 * We don't have a circular buffer, hence use rotation to simulate
	 * circular buffer
	 */
	for (i = 0; i < tbl->win_size - pkt_to_send; ++i) {
		tbl->rx_reorder_ptr[i] = tbl->rx_reorder_ptr[pkt_to_send + i];
		tbl->rx_reorder_ptr[pkt_to_send + i] = NULL;
	}

	tbl->start_win = start_win;
	spin_unlock_irqrestore(&priv->rx_pkt_lock, flags);
}

/*
 * This function dispatches all packets in the Rx reorder table until
 * a hole is found.
 *
 * The start window is adjusted automatically when a hole is located.
 * Since the buffer is linear, the function uses rotation to simulate
 * circular buffer.
 */
static void
mwifiex_11n_scan_and_dispatch(struct mwifiex_private *priv,
			      struct mwifiex_rx_reorder_tbl *tbl)
{
	int i, j, xchg;
	void *rx_tmp_ptr;
	unsigned long flags;

	for (i = 0; i < tbl->win_size; ++i) {
		spin_lock_irqsave(&priv->rx_pkt_lock, flags);
		if (!tbl->rx_reorder_ptr[i]) {
			spin_unlock_irqrestore(&priv->rx_pkt_lock, flags);
			break;
		}
		rx_tmp_ptr = tbl->rx_reorder_ptr[i];
		tbl->rx_reorder_ptr[i] = NULL;
		spin_unlock_irqrestore(&priv->rx_pkt_lock, flags);
		mwifiex_11n_dispatch_pkt(priv, rx_tmp_ptr);
	}

	spin_lock_irqsave(&priv->rx_pkt_lock, flags);
	/*
	 * We don't have a circular buffer, hence use rotation to simulate
	 * circular buffer
	 */
	if (i > 0) {
		xchg = tbl->win_size - i;
		for (j = 0; j < xchg; ++j) {
			tbl->rx_reorder_ptr[j] = tbl->rx_reorder_ptr[i + j];
			tbl->rx_reorder_ptr[i + j] = NULL;
		}
	}
	tbl->start_win = (tbl->start_win + i) & (MAX_TID_VALUE - 1);
	spin_unlock_irqrestore(&priv->rx_pkt_lock, flags);
}

/*
 * This function deletes the Rx reorder table and frees the memory.
 *
 * The function stops the associated timer and dispatches all the
 * pending packets in the Rx reorder table before deletion.
 */
static void
mwifiex_del_rx_reorder_entry(struct mwifiex_private *priv,
			     struct mwifiex_rx_reorder_tbl *tbl)
{
	unsigned long flags;
	int start_win;

	if (!tbl)
		return;

	spin_lock_irqsave(&priv->adapter->rx_proc_lock, flags);
	priv->adapter->rx_locked = true;
	if (priv->adapter->rx_processing) {
		spin_unlock_irqrestore(&priv->adapter->rx_proc_lock, flags);
		flush_workqueue(priv->adapter->rx_workqueue);
	} else {
		spin_unlock_irqrestore(&priv->adapter->rx_proc_lock, flags);
	}

	start_win = (tbl->start_win + tbl->win_size) & (MAX_TID_VALUE - 1);
	mwifiex_11n_dispatch_pkt_until_start_win(priv, tbl, start_win);

	del_timer_sync(&tbl->timer_context.timer);
	tbl->timer_context.timer_is_set = false;

	spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
	list_del(&tbl->list);
	spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);

	kfree(tbl->rx_reorder_ptr);
	kfree(tbl);

	spin_lock_irqsave(&priv->adapter->rx_proc_lock, flags);
	priv->adapter->rx_locked = false;
	spin_unlock_irqrestore(&priv->adapter->rx_proc_lock, flags);

}

/*
 * This function returns the pointer to an entry in Rx reordering
 * table which matches the given TA/TID pair.
 */
struct mwifiex_rx_reorder_tbl *
mwifiex_11n_get_rx_reorder_tbl(struct mwifiex_private *priv, int tid, u8 *ta)
{
	struct mwifiex_rx_reorder_tbl *tbl;
	unsigned long flags;

	spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
	list_for_each_entry(tbl, &priv->rx_reorder_tbl_ptr, list) {
		if (!memcmp(tbl->ta, ta, ETH_ALEN) && tbl->tid == tid) {
			spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock,
					       flags);
			return tbl;
		}
	}
	spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);

	return NULL;
}

/* This function retrieves the pointer to an entry in Rx reordering
 * table which matches the given TA and deletes it.
 */
void mwifiex_11n_del_rx_reorder_tbl_by_ta(struct mwifiex_private *priv, u8 *ta)
{
	struct mwifiex_rx_reorder_tbl *tbl, *tmp;
	unsigned long flags;

	if (!ta)
		return;

	spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
	list_for_each_entry_safe(tbl, tmp, &priv->rx_reorder_tbl_ptr, list) {
		if (!memcmp(tbl->ta, ta, ETH_ALEN)) {
			spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock,
					       flags);
			mwifiex_del_rx_reorder_entry(priv, tbl);
			spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
		}
	}
	spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);

	return;
}

/*
 * This function finds the last sequence number used in the packets
 * buffered in Rx reordering table.
 */
static int
mwifiex_11n_find_last_seq_num(struct reorder_tmr_cnxt *ctx)
{
	struct mwifiex_rx_reorder_tbl *rx_reorder_tbl_ptr = ctx->ptr;
	struct mwifiex_private *priv = ctx->priv;
	unsigned long flags;
	int i;

	spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
	for (i = rx_reorder_tbl_ptr->win_size - 1; i >= 0; --i) {
		if (rx_reorder_tbl_ptr->rx_reorder_ptr[i]) {
			spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock,
					       flags);
			return i;
		}
	}
	spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);

	return -1;
}

/*
 * This function flushes all the packets in Rx reordering table.
 *
 * The function checks if any packets are currently buffered in the
 * table or not. In case there are packets available, it dispatches
 * them and then dumps the Rx reordering table.
 */
static void
mwifiex_flush_data(unsigned long context)
{
	struct reorder_tmr_cnxt *ctx =
		(struct reorder_tmr_cnxt *) context;
	int start_win, seq_num;

	ctx->timer_is_set = false;
	seq_num = mwifiex_11n_find_last_seq_num(ctx);

	if (seq_num < 0)
		return;

	dev_dbg(ctx->priv->adapter->dev, "info: flush data %d\n", seq_num);
	start_win = (ctx->ptr->start_win + seq_num + 1) & (MAX_TID_VALUE - 1);
	mwifiex_11n_dispatch_pkt_until_start_win(ctx->priv, ctx->ptr,
						 start_win);
}

/*
 * This function creates an entry in Rx reordering table for the
 * given TA/TID.
 *
 * The function also initializes the entry with sequence number, window
 * size as well as initializes the timer.
 *
 * If the received TA/TID pair is already present, all the packets are
 * dispatched and the window size is moved until the SSN.
 */
static void
mwifiex_11n_create_rx_reorder_tbl(struct mwifiex_private *priv, u8 *ta,
				  int tid, int win_size, int seq_num)
{
	int i;
	struct mwifiex_rx_reorder_tbl *tbl, *new_node;
	u16 last_seq = 0;
	unsigned long flags;
	struct mwifiex_sta_node *node;

	/*
	 * If we get a TID, ta pair which is already present dispatch all the
	 * the packets and move the window size until the ssn
	 */
	tbl = mwifiex_11n_get_rx_reorder_tbl(priv, tid, ta);
	if (tbl) {
		mwifiex_11n_dispatch_pkt_until_start_win(priv, tbl, seq_num);
		return;
	}
	/* if !tbl then create one */
	new_node = kzalloc(sizeof(struct mwifiex_rx_reorder_tbl), GFP_KERNEL);
	if (!new_node)
		return;

	INIT_LIST_HEAD(&new_node->list);
	new_node->tid = tid;
	memcpy(new_node->ta, ta, ETH_ALEN);
	new_node->start_win = seq_num;
	new_node->init_win = seq_num;
	new_node->flags = 0;

	if (mwifiex_queuing_ra_based(priv)) {
		dev_dbg(priv->adapter->dev,
			"info: AP/ADHOC:last_seq=%d start_win=%d\n",
			last_seq, new_node->start_win);
		if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP) {
			node = mwifiex_get_sta_entry(priv, ta);
			if (node)
				last_seq = node->rx_seq[tid];
		}
	} else {
		node = mwifiex_get_sta_entry(priv, ta);
		if (node)
			last_seq = node->rx_seq[tid];
		else
			last_seq = priv->rx_seq[tid];
	}

	if (last_seq != MWIFIEX_DEF_11N_RX_SEQ_NUM &&
	    last_seq >= new_node->start_win) {
		new_node->start_win = last_seq + 1;
		new_node->flags |= RXREOR_INIT_WINDOW_SHIFT;
	}

	new_node->win_size = win_size;

	new_node->rx_reorder_ptr = kzalloc(sizeof(void *) * win_size,
					GFP_KERNEL);
	if (!new_node->rx_reorder_ptr) {
		kfree((u8 *) new_node);
		dev_err(priv->adapter->dev,
			"%s: failed to alloc reorder_ptr\n", __func__);
		return;
	}

	new_node->timer_context.ptr = new_node;
	new_node->timer_context.priv = priv;
	new_node->timer_context.timer_is_set = false;

	init_timer(&new_node->timer_context.timer);
	new_node->timer_context.timer.function = mwifiex_flush_data;
	new_node->timer_context.timer.data =
			(unsigned long) &new_node->timer_context;

	for (i = 0; i < win_size; ++i)
		new_node->rx_reorder_ptr[i] = NULL;

	spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
	list_add_tail(&new_node->list, &priv->rx_reorder_tbl_ptr);
	spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
}

static void
mwifiex_11n_rxreorder_timer_restart(struct mwifiex_rx_reorder_tbl *tbl)
{
	u32 min_flush_time;

	if (tbl->win_size >= MWIFIEX_BA_WIN_SIZE_32)
		min_flush_time = MIN_FLUSH_TIMER_15_MS;
	else
		min_flush_time = MIN_FLUSH_TIMER_MS;

	mod_timer(&tbl->timer_context.timer,
		  jiffies + msecs_to_jiffies(min_flush_time * tbl->win_size));

	tbl->timer_context.timer_is_set = true;
}

/*
 * This function prepares command for adding a BA request.
 *
 * Preparation includes -
 *      - Setting command ID and proper size
 *      - Setting add BA request buffer
 *      - Ensuring correct endian-ness
 */
int mwifiex_cmd_11n_addba_req(struct host_cmd_ds_command *cmd, void *data_buf)
{
	struct host_cmd_ds_11n_addba_req *add_ba_req = &cmd->params.add_ba_req;

	cmd->command = cpu_to_le16(HostCmd_CMD_11N_ADDBA_REQ);
	cmd->size = cpu_to_le16(sizeof(*add_ba_req) + S_DS_GEN);
	memcpy(add_ba_req, data_buf, sizeof(*add_ba_req));

	return 0;
}

/*
 * This function prepares command for adding a BA response.
 *
 * Preparation includes -
 *      - Setting command ID and proper size
 *      - Setting add BA response buffer
 *      - Ensuring correct endian-ness
 */
int mwifiex_cmd_11n_addba_rsp_gen(struct mwifiex_private *priv,
				  struct host_cmd_ds_command *cmd,
				  struct host_cmd_ds_11n_addba_req
				  *cmd_addba_req)
{
	struct host_cmd_ds_11n_addba_rsp *add_ba_rsp = &cmd->params.add_ba_rsp;
	struct mwifiex_sta_node *sta_ptr;
	u32 rx_win_size = priv->add_ba_param.rx_win_size;
	u8 tid;
	int win_size;
	uint16_t block_ack_param_set;

	if ((GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA) &&
	    ISSUPP_TDLS_ENABLED(priv->adapter->fw_cap_info) &&
	    priv->adapter->is_hw_11ac_capable &&
	    memcmp(priv->cfg_bssid, cmd_addba_req->peer_mac_addr, ETH_ALEN)) {
		sta_ptr = mwifiex_get_sta_entry(priv,
						cmd_addba_req->peer_mac_addr);
		if (!sta_ptr) {
			dev_warn(priv->adapter->dev,
				 "BA setup with unknown TDLS peer %pM!\n",
				 cmd_addba_req->peer_mac_addr);
			return -1;
		}
		if (sta_ptr->is_11ac_enabled)
			rx_win_size = MWIFIEX_11AC_STA_AMPDU_DEF_RXWINSIZE;
	}

	cmd->command = cpu_to_le16(HostCmd_CMD_11N_ADDBA_RSP);
	cmd->size = cpu_to_le16(sizeof(*add_ba_rsp) + S_DS_GEN);

	memcpy(add_ba_rsp->peer_mac_addr, cmd_addba_req->peer_mac_addr,
	       ETH_ALEN);
	add_ba_rsp->dialog_token = cmd_addba_req->dialog_token;
	add_ba_rsp->block_ack_tmo = cmd_addba_req->block_ack_tmo;
	add_ba_rsp->ssn = cmd_addba_req->ssn;

	block_ack_param_set = le16_to_cpu(cmd_addba_req->block_ack_param_set);
	tid = (block_ack_param_set & IEEE80211_ADDBA_PARAM_TID_MASK)
		>> BLOCKACKPARAM_TID_POS;
	add_ba_rsp->status_code = cpu_to_le16(ADDBA_RSP_STATUS_ACCEPT);
	block_ack_param_set &= ~IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK;

	/* If we don't support AMSDU inside AMPDU, reset the bit */
	if (!priv->add_ba_param.rx_amsdu ||
	    (priv->aggr_prio_tbl[tid].amsdu == BA_STREAM_NOT_ALLOWED))
		block_ack_param_set &= ~BLOCKACKPARAM_AMSDU_SUPP_MASK;
	block_ack_param_set |= rx_win_size << BLOCKACKPARAM_WINSIZE_POS;
	add_ba_rsp->block_ack_param_set = cpu_to_le16(block_ack_param_set);
	win_size = (le16_to_cpu(add_ba_rsp->block_ack_param_set)
					& IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK)
					>> BLOCKACKPARAM_WINSIZE_POS;
	cmd_addba_req->block_ack_param_set = cpu_to_le16(block_ack_param_set);

	mwifiex_11n_create_rx_reorder_tbl(priv, cmd_addba_req->peer_mac_addr,
					  tid, win_size,
					  le16_to_cpu(cmd_addba_req->ssn));
	return 0;
}

/*
 * This function prepares command for deleting a BA request.
 *
 * Preparation includes -
 *      - Setting command ID and proper size
 *      - Setting del BA request buffer
 *      - Ensuring correct endian-ness
 */
int mwifiex_cmd_11n_delba(struct host_cmd_ds_command *cmd, void *data_buf)
{
	struct host_cmd_ds_11n_delba *del_ba = &cmd->params.del_ba;

	cmd->command = cpu_to_le16(HostCmd_CMD_11N_DELBA);
	cmd->size = cpu_to_le16(sizeof(*del_ba) + S_DS_GEN);
	memcpy(del_ba, data_buf, sizeof(*del_ba));

	return 0;
}

/*
 * This function identifies if Rx reordering is needed for a received packet.
 *
 * In case reordering is required, the function will do the reordering
 * before sending it to kernel.
 *
 * The Rx reorder table is checked first with the received TID/TA pair. If
 * not found, the received packet is dispatched immediately. But if found,
 * the packet is reordered and all the packets in the updated Rx reordering
 * table is dispatched until a hole is found.
 *
 * For sequence number less than the starting window, the packet is dropped.
 */
int mwifiex_11n_rx_reorder_pkt(struct mwifiex_private *priv,
				u16 seq_num, u16 tid,
				u8 *ta, u8 pkt_type, void *payload)
{
	struct mwifiex_rx_reorder_tbl *tbl;
	int prev_start_win, start_win, end_win, win_size;
	u16 pkt_index;
	bool init_window_shift = false;
	int ret = 0;

	tbl = mwifiex_11n_get_rx_reorder_tbl(priv, tid, ta);
	if (!tbl) {
		if (pkt_type != PKT_TYPE_BAR)
			mwifiex_11n_dispatch_pkt(priv, payload);
		return ret;
	}

	if ((pkt_type == PKT_TYPE_AMSDU) && !tbl->amsdu) {
		mwifiex_11n_dispatch_pkt(priv, payload);
		return ret;
	}

	start_win = tbl->start_win;
	prev_start_win = start_win;
	win_size = tbl->win_size;
	end_win = ((start_win + win_size) - 1) & (MAX_TID_VALUE - 1);
	if (tbl->flags & RXREOR_INIT_WINDOW_SHIFT) {
		init_window_shift = true;
		tbl->flags &= ~RXREOR_INIT_WINDOW_SHIFT;
	}

	if (tbl->flags & RXREOR_FORCE_NO_DROP) {
		dev_dbg(priv->adapter->dev,
			"RXREOR_FORCE_NO_DROP when HS is activated\n");
		tbl->flags &= ~RXREOR_FORCE_NO_DROP;
	} else if (init_window_shift && seq_num < start_win &&
		   seq_num >= tbl->init_win) {
		dev_dbg(priv->adapter->dev,
			"Sender TID sequence number reset %d->%d for SSN %d\n",
			start_win, seq_num, tbl->init_win);
		tbl->start_win = start_win = seq_num;
		end_win = ((start_win + win_size) - 1) & (MAX_TID_VALUE - 1);
	} else {
		/*
		 * If seq_num is less then starting win then ignore and drop
		 * the packet
		 */
		if ((start_win + TWOPOW11) > (MAX_TID_VALUE - 1)) {
			if (seq_num >= ((start_win + TWOPOW11) &
					(MAX_TID_VALUE - 1)) &&
			    seq_num < start_win) {
				ret = -1;
				goto done;
			}
		} else if ((seq_num < start_win) ||
			   (seq_num >= (start_win + TWOPOW11))) {
			ret = -1;
			goto done;
		}
	}

	/*
	 * If this packet is a BAR we adjust seq_num as
	 * WinStart = seq_num
	 */
	if (pkt_type == PKT_TYPE_BAR)
		seq_num = ((seq_num + win_size) - 1) & (MAX_TID_VALUE - 1);

	if (((end_win < start_win) &&
	     (seq_num < start_win) && (seq_num > end_win)) ||
	    ((end_win > start_win) && ((seq_num > end_win) ||
				       (seq_num < start_win)))) {
		end_win = seq_num;
		if (((seq_num - win_size) + 1) >= 0)
			start_win = (end_win - win_size) + 1;
		else
			start_win = (MAX_TID_VALUE - (win_size - seq_num)) + 1;
		mwifiex_11n_dispatch_pkt_until_start_win(priv, tbl, start_win);
	}

	if (pkt_type != PKT_TYPE_BAR) {
		if (seq_num >= start_win)
			pkt_index = seq_num - start_win;
		else
			pkt_index = (seq_num+MAX_TID_VALUE) - start_win;

		if (tbl->rx_reorder_ptr[pkt_index]) {
			ret = -1;
			goto done;
		}

		tbl->rx_reorder_ptr[pkt_index] = payload;
	}

	/*
	 * Dispatch all packets sequentially from start_win until a
	 * hole is found and adjust the start_win appropriately
	 */
	mwifiex_11n_scan_and_dispatch(priv, tbl);

done:
	if (!tbl->timer_context.timer_is_set ||
	    prev_start_win != tbl->start_win)
		mwifiex_11n_rxreorder_timer_restart(tbl);
	return ret;
}

/*
 * This function deletes an entry for a given TID/TA pair.
 *
 * The TID/TA are taken from del BA event body.
 */
void
mwifiex_del_ba_tbl(struct mwifiex_private *priv, int tid, u8 *peer_mac,
		   u8 type, int initiator)
{
	struct mwifiex_rx_reorder_tbl *tbl;
	struct mwifiex_tx_ba_stream_tbl *ptx_tbl;
	u8 cleanup_rx_reorder_tbl;
	unsigned long flags;

	if (type == TYPE_DELBA_RECEIVE)
		cleanup_rx_reorder_tbl = (initiator) ? true : false;
	else
		cleanup_rx_reorder_tbl = (initiator) ? false : true;

	dev_dbg(priv->adapter->dev, "event: DELBA: %pM tid=%d initiator=%d\n",
		peer_mac, tid, initiator);

	if (cleanup_rx_reorder_tbl) {
		tbl = mwifiex_11n_get_rx_reorder_tbl(priv, tid,
								 peer_mac);
		if (!tbl) {
			dev_dbg(priv->adapter->dev,
				"event: TID, TA not found in table\n");
			return;
		}
		mwifiex_del_rx_reorder_entry(priv, tbl);
	} else {
		ptx_tbl = mwifiex_get_ba_tbl(priv, tid, peer_mac);
		if (!ptx_tbl) {
			dev_dbg(priv->adapter->dev,
				"event: TID, RA not found in table\n");
			return;
		}

		spin_lock_irqsave(&priv->tx_ba_stream_tbl_lock, flags);
		mwifiex_11n_delete_tx_ba_stream_tbl_entry(priv, ptx_tbl);
		spin_unlock_irqrestore(&priv->tx_ba_stream_tbl_lock, flags);
	}
}

/*
 * This function handles the command response of an add BA response.
 *
 * Handling includes changing the header fields into CPU format and
 * creating the stream, provided the add BA is accepted.
 */
int mwifiex_ret_11n_addba_resp(struct mwifiex_private *priv,
			       struct host_cmd_ds_command *resp)
{
	struct host_cmd_ds_11n_addba_rsp *add_ba_rsp = &resp->params.add_ba_rsp;
	int tid, win_size;
	struct mwifiex_rx_reorder_tbl *tbl;
	uint16_t block_ack_param_set;

	block_ack_param_set = le16_to_cpu(add_ba_rsp->block_ack_param_set);

	tid = (block_ack_param_set & IEEE80211_ADDBA_PARAM_TID_MASK)
		>> BLOCKACKPARAM_TID_POS;
	/*
	 * Check if we had rejected the ADDBA, if yes then do not create
	 * the stream
	 */
	if (le16_to_cpu(add_ba_rsp->status_code) != BA_RESULT_SUCCESS) {
		dev_err(priv->adapter->dev, "ADDBA RSP: failed %pM tid=%d)\n",
			add_ba_rsp->peer_mac_addr, tid);

		tbl = mwifiex_11n_get_rx_reorder_tbl(priv, tid,
						     add_ba_rsp->peer_mac_addr);
		if (tbl)
			mwifiex_del_rx_reorder_entry(priv, tbl);

		return 0;
	}

	win_size = (block_ack_param_set & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK)
		    >> BLOCKACKPARAM_WINSIZE_POS;

	tbl = mwifiex_11n_get_rx_reorder_tbl(priv, tid,
					     add_ba_rsp->peer_mac_addr);
	if (tbl) {
		if ((block_ack_param_set & BLOCKACKPARAM_AMSDU_SUPP_MASK) &&
		    priv->add_ba_param.rx_amsdu &&
		    (priv->aggr_prio_tbl[tid].amsdu != BA_STREAM_NOT_ALLOWED))
			tbl->amsdu = true;
		else
			tbl->amsdu = false;
	}

	dev_dbg(priv->adapter->dev,
		"cmd: ADDBA RSP: %pM tid=%d ssn=%d win_size=%d\n",
		add_ba_rsp->peer_mac_addr, tid, add_ba_rsp->ssn, win_size);

	return 0;
}

/*
 * This function handles BA stream timeout event by preparing and sending
 * a command to the firmware.
 */
void mwifiex_11n_ba_stream_timeout(struct mwifiex_private *priv,
				   struct host_cmd_ds_11n_batimeout *event)
{
	struct host_cmd_ds_11n_delba delba;

	memset(&delba, 0, sizeof(struct host_cmd_ds_11n_delba));
	memcpy(delba.peer_mac_addr, event->peer_mac_addr, ETH_ALEN);

	delba.del_ba_param_set |=
		cpu_to_le16((u16) event->tid << DELBA_TID_POS);
	delba.del_ba_param_set |= cpu_to_le16(
		(u16) event->origninator << DELBA_INITIATOR_POS);
	delba.reason_code = cpu_to_le16(WLAN_REASON_QSTA_TIMEOUT);
	mwifiex_send_cmd(priv, HostCmd_CMD_11N_DELBA, 0, 0, &delba, false);
}

/*
 * This function cleans up the Rx reorder table by deleting all the entries
 * and re-initializing.
 */
void mwifiex_11n_cleanup_reorder_tbl(struct mwifiex_private *priv)
{
	struct mwifiex_rx_reorder_tbl *del_tbl_ptr, *tmp_node;
	unsigned long flags;

	spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
	list_for_each_entry_safe(del_tbl_ptr, tmp_node,
				 &priv->rx_reorder_tbl_ptr, list) {
		spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);
		mwifiex_del_rx_reorder_entry(priv, del_tbl_ptr);
		spin_lock_irqsave(&priv->rx_reorder_tbl_lock, flags);
	}
	INIT_LIST_HEAD(&priv->rx_reorder_tbl_ptr);
	spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, flags);

	mwifiex_reset_11n_rx_seq_num(priv);
}

/*
 * This function updates all rx_reorder_tbl's flags.
 */
void mwifiex_update_rxreor_flags(struct mwifiex_adapter *adapter, u8 flags)
{
	struct mwifiex_private *priv;
	struct mwifiex_rx_reorder_tbl *tbl;
	unsigned long lock_flags;
	int i;

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

		spin_lock_irqsave(&priv->rx_reorder_tbl_lock, lock_flags);
		if (list_empty(&priv->rx_reorder_tbl_ptr)) {
			spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock,
					       lock_flags);
			continue;
		}

		list_for_each_entry(tbl, &priv->rx_reorder_tbl_ptr, list)
			tbl->flags = flags;
		spin_unlock_irqrestore(&priv->rx_reorder_tbl_lock, lock_flags);
	}

	return;
}