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/drivers/net/wireless/mwifiex/wmm.c

http://github.com/mirrors/linux
C | 1268 lines | 820 code | 199 blank | 249 comment | 109 complexity | c2db267d86de3332b62db7325ee01d30 MD5 | raw file
   1/*
   2 * Marvell Wireless LAN device driver: WMM
   3 *
   4 * Copyright (C) 2011, Marvell International Ltd.
   5 *
   6 * This software file (the "File") is distributed by Marvell International
   7 * Ltd. under the terms of the GNU General Public License Version 2, June 1991
   8 * (the "License").  You may use, redistribute and/or modify this File in
   9 * accordance with the terms and conditions of the License, a copy of which
  10 * is available by writing to the Free Software Foundation, Inc.,
  11 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
  12 * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
  13 *
  14 * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
  15 * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
  16 * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
  17 * this warranty disclaimer.
  18 */
  19
  20#include "decl.h"
  21#include "ioctl.h"
  22#include "util.h"
  23#include "fw.h"
  24#include "main.h"
  25#include "wmm.h"
  26#include "11n.h"
  27
  28
  29/* Maximum value FW can accept for driver delay in packet transmission */
  30#define DRV_PKT_DELAY_TO_FW_MAX   512
  31
  32
  33#define WMM_QUEUED_PACKET_LOWER_LIMIT   180
  34
  35#define WMM_QUEUED_PACKET_UPPER_LIMIT   200
  36
  37/* Offset for TOS field in the IP header */
  38#define IPTOS_OFFSET 5
  39
  40static bool enable_tx_amsdu;
  41module_param(enable_tx_amsdu, bool, 0644);
  42
  43/* WMM information IE */
  44static const u8 wmm_info_ie[] = { WLAN_EID_VENDOR_SPECIFIC, 0x07,
  45	0x00, 0x50, 0xf2, 0x02,
  46	0x00, 0x01, 0x00
  47};
  48
  49static const u8 wmm_aci_to_qidx_map[] = { WMM_AC_BE,
  50	WMM_AC_BK,
  51	WMM_AC_VI,
  52	WMM_AC_VO
  53};
  54
  55static u8 tos_to_tid[] = {
  56	/* TID DSCP_P2 DSCP_P1 DSCP_P0 WMM_AC */
  57	0x01,			/* 0 1 0 AC_BK */
  58	0x02,			/* 0 0 0 AC_BK */
  59	0x00,			/* 0 0 1 AC_BE */
  60	0x03,			/* 0 1 1 AC_BE */
  61	0x04,			/* 1 0 0 AC_VI */
  62	0x05,			/* 1 0 1 AC_VI */
  63	0x06,			/* 1 1 0 AC_VO */
  64	0x07			/* 1 1 1 AC_VO */
  65};
  66
  67/*
  68 * This table inverses the tos_to_tid operation to get a priority
  69 * which is in sequential order, and can be compared.
  70 * Use this to compare the priority of two different TIDs.
  71 */
  72static u8 tos_to_tid_inv[] = {
  73	0x02,  /* from tos_to_tid[2] = 0 */
  74	0x00,  /* from tos_to_tid[0] = 1 */
  75	0x01,  /* from tos_to_tid[1] = 2 */
  76	0x03,
  77	0x04,
  78	0x05,
  79	0x06,
  80	0x07};
  81
  82static u8 ac_to_tid[4][2] = { {1, 2}, {0, 3}, {4, 5}, {6, 7} };
  83
  84/*
  85 * This function debug prints the priority parameters for a WMM AC.
  86 */
  87static void
  88mwifiex_wmm_ac_debug_print(const struct ieee_types_wmm_ac_parameters *ac_param)
  89{
  90	const char *ac_str[] = { "BK", "BE", "VI", "VO" };
  91
  92	pr_debug("info: WMM AC_%s: ACI=%d, ACM=%d, Aifsn=%d, "
  93		 "EcwMin=%d, EcwMax=%d, TxopLimit=%d\n",
  94		 ac_str[wmm_aci_to_qidx_map[(ac_param->aci_aifsn_bitmap
  95					     & MWIFIEX_ACI) >> 5]],
  96		 (ac_param->aci_aifsn_bitmap & MWIFIEX_ACI) >> 5,
  97		 (ac_param->aci_aifsn_bitmap & MWIFIEX_ACM) >> 4,
  98		 ac_param->aci_aifsn_bitmap & MWIFIEX_AIFSN,
  99		 ac_param->ecw_bitmap & MWIFIEX_ECW_MIN,
 100		 (ac_param->ecw_bitmap & MWIFIEX_ECW_MAX) >> 4,
 101		 le16_to_cpu(ac_param->tx_op_limit));
 102}
 103
 104/*
 105 * This function allocates a route address list.
 106 *
 107 * The function also initializes the list with the provided RA.
 108 */
 109static struct mwifiex_ra_list_tbl *
 110mwifiex_wmm_allocate_ralist_node(struct mwifiex_adapter *adapter, u8 *ra)
 111{
 112	struct mwifiex_ra_list_tbl *ra_list;
 113
 114	ra_list = kzalloc(sizeof(struct mwifiex_ra_list_tbl), GFP_ATOMIC);
 115	if (!ra_list)
 116		return NULL;
 117
 118	INIT_LIST_HEAD(&ra_list->list);
 119	skb_queue_head_init(&ra_list->skb_head);
 120
 121	memcpy(ra_list->ra, ra, ETH_ALEN);
 122
 123	ra_list->total_pkt_count = 0;
 124
 125	dev_dbg(adapter->dev, "info: allocated ra_list %p\n", ra_list);
 126
 127	return ra_list;
 128}
 129
 130/* This function returns random no between 16 and 32 to be used as threshold
 131 * for no of packets after which BA setup is initiated.
 132 */
 133static u8 mwifiex_get_random_ba_threshold(void)
 134{
 135	u32 sec, usec;
 136	struct timeval ba_tstamp;
 137	u8 ba_threshold;
 138
 139	/* setup ba_packet_threshold here random number between
 140	 * [BA_SETUP_PACKET_OFFSET,
 141	 * BA_SETUP_PACKET_OFFSET+BA_SETUP_MAX_PACKET_THRESHOLD-1]
 142	 */
 143
 144	do_gettimeofday(&ba_tstamp);
 145	sec = (ba_tstamp.tv_sec & 0xFFFF) + (ba_tstamp.tv_sec >> 16);
 146	usec = (ba_tstamp.tv_usec & 0xFFFF) + (ba_tstamp.tv_usec >> 16);
 147	ba_threshold = (((sec << 16) + usec) % BA_SETUP_MAX_PACKET_THRESHOLD)
 148						      + BA_SETUP_PACKET_OFFSET;
 149
 150	return ba_threshold;
 151}
 152
 153/*
 154 * This function allocates and adds a RA list for all TIDs
 155 * with the given RA.
 156 */
 157void
 158mwifiex_ralist_add(struct mwifiex_private *priv, u8 *ra)
 159{
 160	int i;
 161	struct mwifiex_ra_list_tbl *ra_list;
 162	struct mwifiex_adapter *adapter = priv->adapter;
 163	struct mwifiex_sta_node *node;
 164	unsigned long flags;
 165
 166	spin_lock_irqsave(&priv->sta_list_spinlock, flags);
 167	node = mwifiex_get_sta_entry(priv, ra);
 168	spin_unlock_irqrestore(&priv->sta_list_spinlock, flags);
 169
 170	for (i = 0; i < MAX_NUM_TID; ++i) {
 171		ra_list = mwifiex_wmm_allocate_ralist_node(adapter, ra);
 172		dev_dbg(adapter->dev, "info: created ra_list %p\n", ra_list);
 173
 174		if (!ra_list)
 175			break;
 176
 177		ra_list->is_11n_enabled = 0;
 178		if (!mwifiex_queuing_ra_based(priv)) {
 179			ra_list->is_11n_enabled = IS_11N_ENABLED(priv);
 180		} else {
 181			ra_list->is_11n_enabled =
 182				      mwifiex_is_sta_11n_enabled(priv, node);
 183			if (ra_list->is_11n_enabled)
 184				ra_list->max_amsdu = node->max_amsdu;
 185		}
 186
 187		dev_dbg(adapter->dev, "data: ralist %p: is_11n_enabled=%d\n",
 188			ra_list, ra_list->is_11n_enabled);
 189
 190		if (ra_list->is_11n_enabled) {
 191			ra_list->ba_pkt_count = 0;
 192			ra_list->ba_packet_thr =
 193					      mwifiex_get_random_ba_threshold();
 194		}
 195		list_add_tail(&ra_list->list,
 196			      &priv->wmm.tid_tbl_ptr[i].ra_list);
 197	}
 198}
 199
 200/*
 201 * This function sets the WMM queue priorities to their default values.
 202 */
 203static void mwifiex_wmm_default_queue_priorities(struct mwifiex_private *priv)
 204{
 205	/* Default queue priorities: VO->VI->BE->BK */
 206	priv->wmm.queue_priority[0] = WMM_AC_VO;
 207	priv->wmm.queue_priority[1] = WMM_AC_VI;
 208	priv->wmm.queue_priority[2] = WMM_AC_BE;
 209	priv->wmm.queue_priority[3] = WMM_AC_BK;
 210}
 211
 212/*
 213 * This function map ACs to TIDs.
 214 */
 215static void
 216mwifiex_wmm_queue_priorities_tid(struct mwifiex_wmm_desc *wmm)
 217{
 218	u8 *queue_priority = wmm->queue_priority;
 219	int i;
 220
 221	for (i = 0; i < 4; ++i) {
 222		tos_to_tid[7 - (i * 2)] = ac_to_tid[queue_priority[i]][1];
 223		tos_to_tid[6 - (i * 2)] = ac_to_tid[queue_priority[i]][0];
 224	}
 225
 226	for (i = 0; i < MAX_NUM_TID; ++i)
 227		tos_to_tid_inv[tos_to_tid[i]] = (u8)i;
 228
 229	atomic_set(&wmm->highest_queued_prio, HIGH_PRIO_TID);
 230}
 231
 232/*
 233 * This function initializes WMM priority queues.
 234 */
 235void
 236mwifiex_wmm_setup_queue_priorities(struct mwifiex_private *priv,
 237				   struct ieee_types_wmm_parameter *wmm_ie)
 238{
 239	u16 cw_min, avg_back_off, tmp[4];
 240	u32 i, j, num_ac;
 241	u8 ac_idx;
 242
 243	if (!wmm_ie || !priv->wmm_enabled) {
 244		/* WMM is not enabled, just set the defaults and return */
 245		mwifiex_wmm_default_queue_priorities(priv);
 246		return;
 247	}
 248
 249	dev_dbg(priv->adapter->dev, "info: WMM Parameter IE: version=%d, "
 250		"qos_info Parameter Set Count=%d, Reserved=%#x\n",
 251		wmm_ie->vend_hdr.version, wmm_ie->qos_info_bitmap &
 252		IEEE80211_WMM_IE_AP_QOSINFO_PARAM_SET_CNT_MASK,
 253		wmm_ie->reserved);
 254
 255	for (num_ac = 0; num_ac < ARRAY_SIZE(wmm_ie->ac_params); num_ac++) {
 256		u8 ecw = wmm_ie->ac_params[num_ac].ecw_bitmap;
 257		u8 aci_aifsn = wmm_ie->ac_params[num_ac].aci_aifsn_bitmap;
 258		cw_min = (1 << (ecw & MWIFIEX_ECW_MIN)) - 1;
 259		avg_back_off = (cw_min >> 1) + (aci_aifsn & MWIFIEX_AIFSN);
 260
 261		ac_idx = wmm_aci_to_qidx_map[(aci_aifsn & MWIFIEX_ACI) >> 5];
 262		priv->wmm.queue_priority[ac_idx] = ac_idx;
 263		tmp[ac_idx] = avg_back_off;
 264
 265		dev_dbg(priv->adapter->dev,
 266			"info: WMM: CWmax=%d CWmin=%d Avg Back-off=%d\n",
 267			(1 << ((ecw & MWIFIEX_ECW_MAX) >> 4)) - 1,
 268			cw_min, avg_back_off);
 269		mwifiex_wmm_ac_debug_print(&wmm_ie->ac_params[num_ac]);
 270	}
 271
 272	/* Bubble sort */
 273	for (i = 0; i < num_ac; i++) {
 274		for (j = 1; j < num_ac - i; j++) {
 275			if (tmp[j - 1] > tmp[j]) {
 276				swap(tmp[j - 1], tmp[j]);
 277				swap(priv->wmm.queue_priority[j - 1],
 278				     priv->wmm.queue_priority[j]);
 279			} else if (tmp[j - 1] == tmp[j]) {
 280				if (priv->wmm.queue_priority[j - 1]
 281				    < priv->wmm.queue_priority[j])
 282					swap(priv->wmm.queue_priority[j - 1],
 283					     priv->wmm.queue_priority[j]);
 284			}
 285		}
 286	}
 287
 288	mwifiex_wmm_queue_priorities_tid(&priv->wmm);
 289}
 290
 291/*
 292 * This function evaluates whether or not an AC is to be downgraded.
 293 *
 294 * In case the AC is not enabled, the highest AC is returned that is
 295 * enabled and does not require admission control.
 296 */
 297static enum mwifiex_wmm_ac_e
 298mwifiex_wmm_eval_downgrade_ac(struct mwifiex_private *priv,
 299			      enum mwifiex_wmm_ac_e eval_ac)
 300{
 301	int down_ac;
 302	enum mwifiex_wmm_ac_e ret_ac;
 303	struct mwifiex_wmm_ac_status *ac_status;
 304
 305	ac_status = &priv->wmm.ac_status[eval_ac];
 306
 307	if (!ac_status->disabled)
 308		/* Okay to use this AC, its enabled */
 309		return eval_ac;
 310
 311	/* Setup a default return value of the lowest priority */
 312	ret_ac = WMM_AC_BK;
 313
 314	/*
 315	 *  Find the highest AC that is enabled and does not require
 316	 *  admission control. The spec disallows downgrading to an AC,
 317	 *  which is enabled due to a completed admission control.
 318	 *  Unadmitted traffic is not to be sent on an AC with admitted
 319	 *  traffic.
 320	 */
 321	for (down_ac = WMM_AC_BK; down_ac < eval_ac; down_ac++) {
 322		ac_status = &priv->wmm.ac_status[down_ac];
 323
 324		if (!ac_status->disabled && !ac_status->flow_required)
 325			/* AC is enabled and does not require admission
 326			   control */
 327			ret_ac = (enum mwifiex_wmm_ac_e) down_ac;
 328	}
 329
 330	return ret_ac;
 331}
 332
 333/*
 334 * This function downgrades WMM priority queue.
 335 */
 336void
 337mwifiex_wmm_setup_ac_downgrade(struct mwifiex_private *priv)
 338{
 339	int ac_val;
 340
 341	dev_dbg(priv->adapter->dev, "info: WMM: AC Priorities:"
 342			"BK(0), BE(1), VI(2), VO(3)\n");
 343
 344	if (!priv->wmm_enabled) {
 345		/* WMM is not enabled, default priorities */
 346		for (ac_val = WMM_AC_BK; ac_val <= WMM_AC_VO; ac_val++)
 347			priv->wmm.ac_down_graded_vals[ac_val] =
 348						(enum mwifiex_wmm_ac_e) ac_val;
 349	} else {
 350		for (ac_val = WMM_AC_BK; ac_val <= WMM_AC_VO; ac_val++) {
 351			priv->wmm.ac_down_graded_vals[ac_val]
 352				= mwifiex_wmm_eval_downgrade_ac(priv,
 353						(enum mwifiex_wmm_ac_e) ac_val);
 354			dev_dbg(priv->adapter->dev,
 355				"info: WMM: AC PRIO %d maps to %d\n",
 356				ac_val, priv->wmm.ac_down_graded_vals[ac_val]);
 357		}
 358	}
 359}
 360
 361/*
 362 * This function converts the IP TOS field to an WMM AC
 363 * Queue assignment.
 364 */
 365static enum mwifiex_wmm_ac_e
 366mwifiex_wmm_convert_tos_to_ac(struct mwifiex_adapter *adapter, u32 tos)
 367{
 368	/* Map of TOS UP values to WMM AC */
 369	const enum mwifiex_wmm_ac_e tos_to_ac[] = { WMM_AC_BE,
 370		WMM_AC_BK,
 371		WMM_AC_BK,
 372		WMM_AC_BE,
 373		WMM_AC_VI,
 374		WMM_AC_VI,
 375		WMM_AC_VO,
 376		WMM_AC_VO
 377	};
 378
 379	if (tos >= ARRAY_SIZE(tos_to_ac))
 380		return WMM_AC_BE;
 381
 382	return tos_to_ac[tos];
 383}
 384
 385/*
 386 * This function evaluates a given TID and downgrades it to a lower
 387 * TID if the WMM Parameter IE received from the AP indicates that the
 388 * AP is disabled (due to call admission control (ACM bit). Mapping
 389 * of TID to AC is taken care of internally.
 390 */
 391static u8
 392mwifiex_wmm_downgrade_tid(struct mwifiex_private *priv, u32 tid)
 393{
 394	enum mwifiex_wmm_ac_e ac, ac_down;
 395	u8 new_tid;
 396
 397	ac = mwifiex_wmm_convert_tos_to_ac(priv->adapter, tid);
 398	ac_down = priv->wmm.ac_down_graded_vals[ac];
 399
 400	/* Send the index to tid array, picking from the array will be
 401	 * taken care by dequeuing function
 402	 */
 403	new_tid = ac_to_tid[ac_down][tid % 2];
 404
 405	return new_tid;
 406}
 407
 408/*
 409 * This function initializes the WMM state information and the
 410 * WMM data path queues.
 411 */
 412void
 413mwifiex_wmm_init(struct mwifiex_adapter *adapter)
 414{
 415	int i, j;
 416	struct mwifiex_private *priv;
 417
 418	for (j = 0; j < adapter->priv_num; ++j) {
 419		priv = adapter->priv[j];
 420		if (!priv)
 421			continue;
 422
 423		for (i = 0; i < MAX_NUM_TID; ++i) {
 424			priv->aggr_prio_tbl[i].amsdu = tos_to_tid_inv[i];
 425			priv->aggr_prio_tbl[i].ampdu_ap = tos_to_tid_inv[i];
 426			priv->aggr_prio_tbl[i].ampdu_user = tos_to_tid_inv[i];
 427		}
 428
 429		priv->aggr_prio_tbl[6].amsdu
 430					= priv->aggr_prio_tbl[6].ampdu_ap
 431					= priv->aggr_prio_tbl[6].ampdu_user
 432					= BA_STREAM_NOT_ALLOWED;
 433
 434		priv->aggr_prio_tbl[7].amsdu = priv->aggr_prio_tbl[7].ampdu_ap
 435					= priv->aggr_prio_tbl[7].ampdu_user
 436					= BA_STREAM_NOT_ALLOWED;
 437
 438		mwifiex_set_ba_params(priv);
 439		mwifiex_reset_11n_rx_seq_num(priv);
 440
 441		atomic_set(&priv->wmm.tx_pkts_queued, 0);
 442		atomic_set(&priv->wmm.highest_queued_prio, HIGH_PRIO_TID);
 443	}
 444}
 445
 446/*
 447 * This function checks if WMM Tx queue is empty.
 448 */
 449int
 450mwifiex_wmm_lists_empty(struct mwifiex_adapter *adapter)
 451{
 452	int i;
 453	struct mwifiex_private *priv;
 454
 455	for (i = 0; i < adapter->priv_num; ++i) {
 456		priv = adapter->priv[i];
 457		if (priv && atomic_read(&priv->wmm.tx_pkts_queued))
 458			return false;
 459	}
 460
 461	return true;
 462}
 463
 464/*
 465 * This function deletes all packets in an RA list node.
 466 *
 467 * The packet sent completion callback handler are called with
 468 * status failure, after they are dequeued to ensure proper
 469 * cleanup. The RA list node itself is freed at the end.
 470 */
 471static void
 472mwifiex_wmm_del_pkts_in_ralist_node(struct mwifiex_private *priv,
 473				    struct mwifiex_ra_list_tbl *ra_list)
 474{
 475	struct mwifiex_adapter *adapter = priv->adapter;
 476	struct sk_buff *skb, *tmp;
 477
 478	skb_queue_walk_safe(&ra_list->skb_head, skb, tmp)
 479		mwifiex_write_data_complete(adapter, skb, 0, -1);
 480}
 481
 482/*
 483 * This function deletes all packets in an RA list.
 484 *
 485 * Each nodes in the RA list are freed individually first, and then
 486 * the RA list itself is freed.
 487 */
 488static void
 489mwifiex_wmm_del_pkts_in_ralist(struct mwifiex_private *priv,
 490			       struct list_head *ra_list_head)
 491{
 492	struct mwifiex_ra_list_tbl *ra_list;
 493
 494	list_for_each_entry(ra_list, ra_list_head, list)
 495		mwifiex_wmm_del_pkts_in_ralist_node(priv, ra_list);
 496}
 497
 498/*
 499 * This function deletes all packets in all RA lists.
 500 */
 501static void mwifiex_wmm_cleanup_queues(struct mwifiex_private *priv)
 502{
 503	int i;
 504
 505	for (i = 0; i < MAX_NUM_TID; i++)
 506		mwifiex_wmm_del_pkts_in_ralist(priv, &priv->wmm.tid_tbl_ptr[i].
 507								       ra_list);
 508
 509	atomic_set(&priv->wmm.tx_pkts_queued, 0);
 510	atomic_set(&priv->wmm.highest_queued_prio, HIGH_PRIO_TID);
 511}
 512
 513/*
 514 * This function deletes all route addresses from all RA lists.
 515 */
 516static void mwifiex_wmm_delete_all_ralist(struct mwifiex_private *priv)
 517{
 518	struct mwifiex_ra_list_tbl *ra_list, *tmp_node;
 519	int i;
 520
 521	for (i = 0; i < MAX_NUM_TID; ++i) {
 522		dev_dbg(priv->adapter->dev,
 523			"info: ra_list: freeing buf for tid %d\n", i);
 524		list_for_each_entry_safe(ra_list, tmp_node,
 525					 &priv->wmm.tid_tbl_ptr[i].ra_list,
 526					 list) {
 527			list_del(&ra_list->list);
 528			kfree(ra_list);
 529		}
 530
 531		INIT_LIST_HEAD(&priv->wmm.tid_tbl_ptr[i].ra_list);
 532	}
 533}
 534
 535/*
 536 * This function cleans up the Tx and Rx queues.
 537 *
 538 * Cleanup includes -
 539 *      - All packets in RA lists
 540 *      - All entries in Rx reorder table
 541 *      - All entries in Tx BA stream table
 542 *      - MPA buffer (if required)
 543 *      - All RA lists
 544 */
 545void
 546mwifiex_clean_txrx(struct mwifiex_private *priv)
 547{
 548	unsigned long flags;
 549
 550	mwifiex_11n_cleanup_reorder_tbl(priv);
 551	spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
 552
 553	mwifiex_wmm_cleanup_queues(priv);
 554	mwifiex_11n_delete_all_tx_ba_stream_tbl(priv);
 555
 556	if (priv->adapter->if_ops.cleanup_mpa_buf)
 557		priv->adapter->if_ops.cleanup_mpa_buf(priv->adapter);
 558
 559	mwifiex_wmm_delete_all_ralist(priv);
 560	memcpy(tos_to_tid, ac_to_tid, sizeof(tos_to_tid));
 561
 562	if (priv->adapter->if_ops.clean_pcie_ring)
 563		priv->adapter->if_ops.clean_pcie_ring(priv->adapter);
 564	spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 565}
 566
 567/*
 568 * This function retrieves a particular RA list node, matching with the
 569 * given TID and RA address.
 570 */
 571static struct mwifiex_ra_list_tbl *
 572mwifiex_wmm_get_ralist_node(struct mwifiex_private *priv, u8 tid,
 573			    u8 *ra_addr)
 574{
 575	struct mwifiex_ra_list_tbl *ra_list;
 576
 577	list_for_each_entry(ra_list, &priv->wmm.tid_tbl_ptr[tid].ra_list,
 578			    list) {
 579		if (!memcmp(ra_list->ra, ra_addr, ETH_ALEN))
 580			return ra_list;
 581	}
 582
 583	return NULL;
 584}
 585
 586/*
 587 * This function retrieves an RA list node for a given TID and
 588 * RA address pair.
 589 *
 590 * If no such node is found, a new node is added first and then
 591 * retrieved.
 592 */
 593static struct mwifiex_ra_list_tbl *
 594mwifiex_wmm_get_queue_raptr(struct mwifiex_private *priv, u8 tid, u8 *ra_addr)
 595{
 596	struct mwifiex_ra_list_tbl *ra_list;
 597
 598	ra_list = mwifiex_wmm_get_ralist_node(priv, tid, ra_addr);
 599	if (ra_list)
 600		return ra_list;
 601	mwifiex_ralist_add(priv, ra_addr);
 602
 603	return mwifiex_wmm_get_ralist_node(priv, tid, ra_addr);
 604}
 605
 606/*
 607 * This function checks if a particular RA list node exists in a given TID
 608 * table index.
 609 */
 610int
 611mwifiex_is_ralist_valid(struct mwifiex_private *priv,
 612			struct mwifiex_ra_list_tbl *ra_list, int ptr_index)
 613{
 614	struct mwifiex_ra_list_tbl *rlist;
 615
 616	list_for_each_entry(rlist, &priv->wmm.tid_tbl_ptr[ptr_index].ra_list,
 617			    list) {
 618		if (rlist == ra_list)
 619			return true;
 620	}
 621
 622	return false;
 623}
 624
 625/*
 626 * This function adds a packet to WMM queue.
 627 *
 628 * In disconnected state the packet is immediately dropped and the
 629 * packet send completion callback is called with status failure.
 630 *
 631 * Otherwise, the correct RA list node is located and the packet
 632 * is queued at the list tail.
 633 */
 634void
 635mwifiex_wmm_add_buf_txqueue(struct mwifiex_private *priv,
 636			    struct sk_buff *skb)
 637{
 638	struct mwifiex_adapter *adapter = priv->adapter;
 639	u32 tid;
 640	struct mwifiex_ra_list_tbl *ra_list;
 641	u8 ra[ETH_ALEN], tid_down;
 642	unsigned long flags;
 643
 644	if (!priv->media_connected && !mwifiex_is_skb_mgmt_frame(skb)) {
 645		dev_dbg(adapter->dev, "data: drop packet in disconnect\n");
 646		mwifiex_write_data_complete(adapter, skb, 0, -1);
 647		return;
 648	}
 649
 650	tid = skb->priority;
 651
 652	spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
 653
 654	tid_down = mwifiex_wmm_downgrade_tid(priv, tid);
 655
 656	/* In case of infra as we have already created the list during
 657	   association we just don't have to call get_queue_raptr, we will
 658	   have only 1 raptr for a tid in case of infra */
 659	if (!mwifiex_queuing_ra_based(priv) &&
 660	    !mwifiex_is_skb_mgmt_frame(skb)) {
 661		if (!list_empty(&priv->wmm.tid_tbl_ptr[tid_down].ra_list))
 662			ra_list = list_first_entry(
 663				&priv->wmm.tid_tbl_ptr[tid_down].ra_list,
 664				struct mwifiex_ra_list_tbl, list);
 665		else
 666			ra_list = NULL;
 667	} else {
 668		memcpy(ra, skb->data, ETH_ALEN);
 669		if (ra[0] & 0x01 || mwifiex_is_skb_mgmt_frame(skb))
 670			memset(ra, 0xff, ETH_ALEN);
 671		ra_list = mwifiex_wmm_get_queue_raptr(priv, tid_down, ra);
 672	}
 673
 674	if (!ra_list) {
 675		spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 676		mwifiex_write_data_complete(adapter, skb, 0, -1);
 677		return;
 678	}
 679
 680	skb_queue_tail(&ra_list->skb_head, skb);
 681
 682	ra_list->ba_pkt_count++;
 683	ra_list->total_pkt_count++;
 684
 685	if (atomic_read(&priv->wmm.highest_queued_prio) <
 686						tos_to_tid_inv[tid_down])
 687		atomic_set(&priv->wmm.highest_queued_prio,
 688			   tos_to_tid_inv[tid_down]);
 689
 690	atomic_inc(&priv->wmm.tx_pkts_queued);
 691
 692	spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 693}
 694
 695/*
 696 * This function processes the get WMM status command response from firmware.
 697 *
 698 * The response may contain multiple TLVs -
 699 *      - AC Queue status TLVs
 700 *      - Current WMM Parameter IE TLV
 701 *      - Admission Control action frame TLVs
 702 *
 703 * This function parses the TLVs and then calls further specific functions
 704 * to process any changes in the queue prioritize or state.
 705 */
 706int mwifiex_ret_wmm_get_status(struct mwifiex_private *priv,
 707			       const struct host_cmd_ds_command *resp)
 708{
 709	u8 *curr = (u8 *) &resp->params.get_wmm_status;
 710	uint16_t resp_len = le16_to_cpu(resp->size), tlv_len;
 711	int valid = true;
 712
 713	struct mwifiex_ie_types_data *tlv_hdr;
 714	struct mwifiex_ie_types_wmm_queue_status *tlv_wmm_qstatus;
 715	struct ieee_types_wmm_parameter *wmm_param_ie = NULL;
 716	struct mwifiex_wmm_ac_status *ac_status;
 717
 718	dev_dbg(priv->adapter->dev, "info: WMM: WMM_GET_STATUS cmdresp received: %d\n",
 719		resp_len);
 720
 721	while ((resp_len >= sizeof(tlv_hdr->header)) && valid) {
 722		tlv_hdr = (struct mwifiex_ie_types_data *) curr;
 723		tlv_len = le16_to_cpu(tlv_hdr->header.len);
 724
 725		switch (le16_to_cpu(tlv_hdr->header.type)) {
 726		case TLV_TYPE_WMMQSTATUS:
 727			tlv_wmm_qstatus =
 728				(struct mwifiex_ie_types_wmm_queue_status *)
 729				tlv_hdr;
 730			dev_dbg(priv->adapter->dev,
 731				"info: CMD_RESP: WMM_GET_STATUS:"
 732				" QSTATUS TLV: %d, %d, %d\n",
 733				tlv_wmm_qstatus->queue_index,
 734				tlv_wmm_qstatus->flow_required,
 735				tlv_wmm_qstatus->disabled);
 736
 737			ac_status = &priv->wmm.ac_status[tlv_wmm_qstatus->
 738							 queue_index];
 739			ac_status->disabled = tlv_wmm_qstatus->disabled;
 740			ac_status->flow_required =
 741						tlv_wmm_qstatus->flow_required;
 742			ac_status->flow_created = tlv_wmm_qstatus->flow_created;
 743			break;
 744
 745		case WLAN_EID_VENDOR_SPECIFIC:
 746			/*
 747			 * Point the regular IEEE IE 2 bytes into the Marvell IE
 748			 *   and setup the IEEE IE type and length byte fields
 749			 */
 750
 751			wmm_param_ie =
 752				(struct ieee_types_wmm_parameter *) (curr +
 753								    2);
 754			wmm_param_ie->vend_hdr.len = (u8) tlv_len;
 755			wmm_param_ie->vend_hdr.element_id =
 756						WLAN_EID_VENDOR_SPECIFIC;
 757
 758			dev_dbg(priv->adapter->dev,
 759				"info: CMD_RESP: WMM_GET_STATUS:"
 760				" WMM Parameter Set Count: %d\n",
 761				wmm_param_ie->qos_info_bitmap &
 762				IEEE80211_WMM_IE_AP_QOSINFO_PARAM_SET_CNT_MASK);
 763
 764			memcpy((u8 *) &priv->curr_bss_params.bss_descriptor.
 765			       wmm_ie, wmm_param_ie,
 766			       wmm_param_ie->vend_hdr.len + 2);
 767
 768			break;
 769
 770		default:
 771			valid = false;
 772			break;
 773		}
 774
 775		curr += (tlv_len + sizeof(tlv_hdr->header));
 776		resp_len -= (tlv_len + sizeof(tlv_hdr->header));
 777	}
 778
 779	mwifiex_wmm_setup_queue_priorities(priv, wmm_param_ie);
 780	mwifiex_wmm_setup_ac_downgrade(priv);
 781
 782	return 0;
 783}
 784
 785/*
 786 * Callback handler from the command module to allow insertion of a WMM TLV.
 787 *
 788 * If the BSS we are associating to supports WMM, this function adds the
 789 * required WMM Information IE to the association request command buffer in
 790 * the form of a Marvell extended IEEE IE.
 791 */
 792u32
 793mwifiex_wmm_process_association_req(struct mwifiex_private *priv,
 794				    u8 **assoc_buf,
 795				    struct ieee_types_wmm_parameter *wmm_ie,
 796				    struct ieee80211_ht_cap *ht_cap)
 797{
 798	struct mwifiex_ie_types_wmm_param_set *wmm_tlv;
 799	u32 ret_len = 0;
 800
 801	/* Null checks */
 802	if (!assoc_buf)
 803		return 0;
 804	if (!(*assoc_buf))
 805		return 0;
 806
 807	if (!wmm_ie)
 808		return 0;
 809
 810	dev_dbg(priv->adapter->dev,
 811		"info: WMM: process assoc req: bss->wmm_ie=%#x\n",
 812		wmm_ie->vend_hdr.element_id);
 813
 814	if ((priv->wmm_required ||
 815	     (ht_cap && (priv->adapter->config_bands & BAND_GN ||
 816	     priv->adapter->config_bands & BAND_AN))) &&
 817	    wmm_ie->vend_hdr.element_id == WLAN_EID_VENDOR_SPECIFIC) {
 818		wmm_tlv = (struct mwifiex_ie_types_wmm_param_set *) *assoc_buf;
 819		wmm_tlv->header.type = cpu_to_le16((u16) wmm_info_ie[0]);
 820		wmm_tlv->header.len = cpu_to_le16((u16) wmm_info_ie[1]);
 821		memcpy(wmm_tlv->wmm_ie, &wmm_info_ie[2],
 822		       le16_to_cpu(wmm_tlv->header.len));
 823		if (wmm_ie->qos_info_bitmap & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD)
 824			memcpy((u8 *) (wmm_tlv->wmm_ie
 825				       + le16_to_cpu(wmm_tlv->header.len)
 826				       - sizeof(priv->wmm_qosinfo)),
 827			       &priv->wmm_qosinfo, sizeof(priv->wmm_qosinfo));
 828
 829		ret_len = sizeof(wmm_tlv->header)
 830			  + le16_to_cpu(wmm_tlv->header.len);
 831
 832		*assoc_buf += ret_len;
 833	}
 834
 835	return ret_len;
 836}
 837
 838/*
 839 * This function computes the time delay in the driver queues for a
 840 * given packet.
 841 *
 842 * When the packet is received at the OS/Driver interface, the current
 843 * time is set in the packet structure. The difference between the present
 844 * time and that received time is computed in this function and limited
 845 * based on pre-compiled limits in the driver.
 846 */
 847u8
 848mwifiex_wmm_compute_drv_pkt_delay(struct mwifiex_private *priv,
 849				  const struct sk_buff *skb)
 850{
 851	u8 ret_val;
 852	struct timeval out_tstamp, in_tstamp;
 853	u32 queue_delay;
 854
 855	do_gettimeofday(&out_tstamp);
 856	in_tstamp = ktime_to_timeval(skb->tstamp);
 857
 858	queue_delay = (out_tstamp.tv_sec - in_tstamp.tv_sec) * 1000;
 859	queue_delay += (out_tstamp.tv_usec - in_tstamp.tv_usec) / 1000;
 860
 861	/*
 862	 * Queue delay is passed as a uint8 in units of 2ms (ms shifted
 863	 *  by 1). Min value (other than 0) is therefore 2ms, max is 510ms.
 864	 *
 865	 * Pass max value if queue_delay is beyond the uint8 range
 866	 */
 867	ret_val = (u8) (min(queue_delay, priv->wmm.drv_pkt_delay_max) >> 1);
 868
 869	dev_dbg(priv->adapter->dev, "data: WMM: Pkt Delay: %d ms,"
 870				" %d ms sent to FW\n", queue_delay, ret_val);
 871
 872	return ret_val;
 873}
 874
 875/*
 876 * This function retrieves the highest priority RA list table pointer.
 877 */
 878static struct mwifiex_ra_list_tbl *
 879mwifiex_wmm_get_highest_priolist_ptr(struct mwifiex_adapter *adapter,
 880				     struct mwifiex_private **priv, int *tid)
 881{
 882	struct mwifiex_private *priv_tmp;
 883	struct mwifiex_ra_list_tbl *ptr;
 884	struct mwifiex_tid_tbl *tid_ptr;
 885	atomic_t *hqp;
 886	unsigned long flags_bss, flags_ra;
 887	int i, j;
 888
 889	/* check the BSS with highest priority first */
 890	for (j = adapter->priv_num - 1; j >= 0; --j) {
 891		spin_lock_irqsave(&adapter->bss_prio_tbl[j].bss_prio_lock,
 892				  flags_bss);
 893
 894		/* iterate over BSS with the equal priority */
 895		list_for_each_entry(adapter->bss_prio_tbl[j].bss_prio_cur,
 896				    &adapter->bss_prio_tbl[j].bss_prio_head,
 897				    list) {
 898
 899			priv_tmp = adapter->bss_prio_tbl[j].bss_prio_cur->priv;
 900
 901			if (atomic_read(&priv_tmp->wmm.tx_pkts_queued) == 0)
 902				continue;
 903
 904			/* iterate over the WMM queues of the BSS */
 905			hqp = &priv_tmp->wmm.highest_queued_prio;
 906			for (i = atomic_read(hqp); i >= LOW_PRIO_TID; --i) {
 907
 908				spin_lock_irqsave(&priv_tmp->wmm.
 909						  ra_list_spinlock, flags_ra);
 910
 911				tid_ptr = &(priv_tmp)->wmm.
 912					tid_tbl_ptr[tos_to_tid[i]];
 913
 914				/* iterate over receiver addresses */
 915				list_for_each_entry(ptr, &tid_ptr->ra_list,
 916						    list) {
 917
 918					if (!skb_queue_empty(&ptr->skb_head))
 919						/* holds both locks */
 920						goto found;
 921				}
 922
 923				spin_unlock_irqrestore(&priv_tmp->wmm.
 924						       ra_list_spinlock,
 925						       flags_ra);
 926			}
 927		}
 928
 929		spin_unlock_irqrestore(&adapter->bss_prio_tbl[j].bss_prio_lock,
 930				       flags_bss);
 931	}
 932
 933	return NULL;
 934
 935found:
 936	/* holds bss_prio_lock / ra_list_spinlock */
 937	if (atomic_read(hqp) > i)
 938		atomic_set(hqp, i);
 939	spin_unlock_irqrestore(&priv_tmp->wmm.ra_list_spinlock, flags_ra);
 940	spin_unlock_irqrestore(&adapter->bss_prio_tbl[j].bss_prio_lock,
 941			       flags_bss);
 942
 943	*priv = priv_tmp;
 944	*tid = tos_to_tid[i];
 945
 946	return ptr;
 947}
 948
 949/* This functions rotates ra and bss lists so packets are picked round robin.
 950 *
 951 * After a packet is successfully transmitted, rotate the ra list, so the ra
 952 * next to the one transmitted, will come first in the list. This way we pick
 953 * the ra' in a round robin fashion. Same applies to bss nodes of equal
 954 * priority.
 955 *
 956 * Function also increments wmm.packets_out counter.
 957 */
 958void mwifiex_rotate_priolists(struct mwifiex_private *priv,
 959				 struct mwifiex_ra_list_tbl *ra,
 960				 int tid)
 961{
 962	struct mwifiex_adapter *adapter = priv->adapter;
 963	struct mwifiex_bss_prio_tbl *tbl = adapter->bss_prio_tbl;
 964	struct mwifiex_tid_tbl *tid_ptr = &priv->wmm.tid_tbl_ptr[tid];
 965	unsigned long flags;
 966
 967	spin_lock_irqsave(&tbl[priv->bss_priority].bss_prio_lock, flags);
 968	/*
 969	 * dirty trick: we remove 'head' temporarily and reinsert it after
 970	 * curr bss node. imagine list to stay fixed while head is moved
 971	 */
 972	list_move(&tbl[priv->bss_priority].bss_prio_head,
 973		  &tbl[priv->bss_priority].bss_prio_cur->list);
 974	spin_unlock_irqrestore(&tbl[priv->bss_priority].bss_prio_lock, flags);
 975
 976	spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
 977	if (mwifiex_is_ralist_valid(priv, ra, tid)) {
 978		priv->wmm.packets_out[tid]++;
 979		/* same as above */
 980		list_move(&tid_ptr->ra_list, &ra->list);
 981	}
 982	spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
 983}
 984
 985/*
 986 * This function checks if 11n aggregation is possible.
 987 */
 988static int
 989mwifiex_is_11n_aggragation_possible(struct mwifiex_private *priv,
 990				    struct mwifiex_ra_list_tbl *ptr,
 991				    int max_buf_size)
 992{
 993	int count = 0, total_size = 0;
 994	struct sk_buff *skb, *tmp;
 995	int max_amsdu_size;
 996
 997	if (priv->bss_role == MWIFIEX_BSS_ROLE_UAP && priv->ap_11n_enabled &&
 998	    ptr->is_11n_enabled)
 999		max_amsdu_size = min_t(int, ptr->max_amsdu, max_buf_size);
1000	else
1001		max_amsdu_size = max_buf_size;
1002
1003	skb_queue_walk_safe(&ptr->skb_head, skb, tmp) {
1004		total_size += skb->len;
1005		if (total_size >= max_amsdu_size)
1006			break;
1007		if (++count >= MIN_NUM_AMSDU)
1008			return true;
1009	}
1010
1011	return false;
1012}
1013
1014/*
1015 * This function sends a single packet to firmware for transmission.
1016 */
1017static void
1018mwifiex_send_single_packet(struct mwifiex_private *priv,
1019			   struct mwifiex_ra_list_tbl *ptr, int ptr_index,
1020			   unsigned long ra_list_flags)
1021			   __releases(&priv->wmm.ra_list_spinlock)
1022{
1023	struct sk_buff *skb, *skb_next;
1024	struct mwifiex_tx_param tx_param;
1025	struct mwifiex_adapter *adapter = priv->adapter;
1026	struct mwifiex_txinfo *tx_info;
1027
1028	if (skb_queue_empty(&ptr->skb_head)) {
1029		spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1030				       ra_list_flags);
1031		dev_dbg(adapter->dev, "data: nothing to send\n");
1032		return;
1033	}
1034
1035	skb = skb_dequeue(&ptr->skb_head);
1036
1037	tx_info = MWIFIEX_SKB_TXCB(skb);
1038	dev_dbg(adapter->dev, "data: dequeuing the packet %p %p\n", ptr, skb);
1039
1040	ptr->total_pkt_count--;
1041
1042	if (!skb_queue_empty(&ptr->skb_head))
1043		skb_next = skb_peek(&ptr->skb_head);
1044	else
1045		skb_next = NULL;
1046
1047	spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, ra_list_flags);
1048
1049	tx_param.next_pkt_len = ((skb_next) ? skb_next->len +
1050				sizeof(struct txpd) : 0);
1051
1052	if (mwifiex_process_tx(priv, skb, &tx_param) == -EBUSY) {
1053		/* Queue the packet back at the head */
1054		spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags);
1055
1056		if (!mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
1057			spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1058					       ra_list_flags);
1059			mwifiex_write_data_complete(adapter, skb, 0, -1);
1060			return;
1061		}
1062
1063		skb_queue_tail(&ptr->skb_head, skb);
1064
1065		ptr->total_pkt_count++;
1066		ptr->ba_pkt_count++;
1067		tx_info->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT;
1068		spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1069				       ra_list_flags);
1070	} else {
1071		mwifiex_rotate_priolists(priv, ptr, ptr_index);
1072		atomic_dec(&priv->wmm.tx_pkts_queued);
1073	}
1074}
1075
1076/*
1077 * This function checks if the first packet in the given RA list
1078 * is already processed or not.
1079 */
1080static int
1081mwifiex_is_ptr_processed(struct mwifiex_private *priv,
1082			 struct mwifiex_ra_list_tbl *ptr)
1083{
1084	struct sk_buff *skb;
1085	struct mwifiex_txinfo *tx_info;
1086
1087	if (skb_queue_empty(&ptr->skb_head))
1088		return false;
1089
1090	skb = skb_peek(&ptr->skb_head);
1091
1092	tx_info = MWIFIEX_SKB_TXCB(skb);
1093	if (tx_info->flags & MWIFIEX_BUF_FLAG_REQUEUED_PKT)
1094		return true;
1095
1096	return false;
1097}
1098
1099/*
1100 * This function sends a single processed packet to firmware for
1101 * transmission.
1102 */
1103static void
1104mwifiex_send_processed_packet(struct mwifiex_private *priv,
1105			      struct mwifiex_ra_list_tbl *ptr, int ptr_index,
1106			      unsigned long ra_list_flags)
1107				__releases(&priv->wmm.ra_list_spinlock)
1108{
1109	struct mwifiex_tx_param tx_param;
1110	struct mwifiex_adapter *adapter = priv->adapter;
1111	int ret = -1;
1112	struct sk_buff *skb, *skb_next;
1113	struct mwifiex_txinfo *tx_info;
1114
1115	if (skb_queue_empty(&ptr->skb_head)) {
1116		spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1117				       ra_list_flags);
1118		return;
1119	}
1120
1121	skb = skb_dequeue(&ptr->skb_head);
1122
1123	if (!skb_queue_empty(&ptr->skb_head))
1124		skb_next = skb_peek(&ptr->skb_head);
1125	else
1126		skb_next = NULL;
1127
1128	tx_info = MWIFIEX_SKB_TXCB(skb);
1129
1130	spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, ra_list_flags);
1131
1132	if (adapter->iface_type == MWIFIEX_USB) {
1133		adapter->data_sent = true;
1134		ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_USB_EP_DATA,
1135						   skb, NULL);
1136	} else {
1137		tx_param.next_pkt_len =
1138			((skb_next) ? skb_next->len +
1139			 sizeof(struct txpd) : 0);
1140		ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA,
1141						   skb, &tx_param);
1142	}
1143
1144	switch (ret) {
1145	case -EBUSY:
1146		dev_dbg(adapter->dev, "data: -EBUSY is returned\n");
1147		spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags);
1148
1149		if (!mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
1150			spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1151					       ra_list_flags);
1152			mwifiex_write_data_complete(adapter, skb, 0, -1);
1153			return;
1154		}
1155
1156		skb_queue_tail(&ptr->skb_head, skb);
1157
1158		tx_info->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT;
1159		spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
1160				       ra_list_flags);
1161		break;
1162	case -1:
1163		if (adapter->iface_type != MWIFIEX_PCIE)
1164			adapter->data_sent = false;
1165		dev_err(adapter->dev, "host_to_card failed: %#x\n", ret);
1166		adapter->dbg.num_tx_host_to_card_failure++;
1167		mwifiex_write_data_complete(adapter, skb, 0, ret);
1168		break;
1169	case -EINPROGRESS:
1170		if (adapter->iface_type != MWIFIEX_PCIE)
1171			adapter->data_sent = false;
1172	default:
1173		break;
1174	}
1175	if (ret != -EBUSY) {
1176		mwifiex_rotate_priolists(priv, ptr, ptr_index);
1177		atomic_dec(&priv->wmm.tx_pkts_queued);
1178	}
1179}
1180
1181/*
1182 * This function dequeues a packet from the highest priority list
1183 * and transmits it.
1184 */
1185static int
1186mwifiex_dequeue_tx_packet(struct mwifiex_adapter *adapter)
1187{
1188	struct mwifiex_ra_list_tbl *ptr;
1189	struct mwifiex_private *priv = NULL;
1190	int ptr_index = 0;
1191	u8 ra[ETH_ALEN];
1192	int tid_del = 0, tid = 0;
1193	unsigned long flags;
1194
1195	ptr = mwifiex_wmm_get_highest_priolist_ptr(adapter, &priv, &ptr_index);
1196	if (!ptr)
1197		return -1;
1198
1199	tid = mwifiex_get_tid(ptr);
1200
1201	dev_dbg(adapter->dev, "data: tid=%d\n", tid);
1202
1203	spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
1204	if (!mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
1205		spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
1206		return -1;
1207	}
1208
1209	if (mwifiex_is_ptr_processed(priv, ptr)) {
1210		mwifiex_send_processed_packet(priv, ptr, ptr_index, flags);
1211		/* ra_list_spinlock has been freed in
1212		   mwifiex_send_processed_packet() */
1213		return 0;
1214	}
1215
1216	if (!ptr->is_11n_enabled ||
1217	    mwifiex_is_ba_stream_setup(priv, ptr, tid) ||
1218	    priv->wps.session_enable ||
1219	    ((priv->sec_info.wpa_enabled ||
1220	      priv->sec_info.wpa2_enabled) &&
1221	     !priv->wpa_is_gtk_set)) {
1222		mwifiex_send_single_packet(priv, ptr, ptr_index, flags);
1223		/* ra_list_spinlock has been freed in
1224		   mwifiex_send_single_packet() */
1225	} else {
1226		if (mwifiex_is_ampdu_allowed(priv, tid) &&
1227		    ptr->ba_pkt_count > ptr->ba_packet_thr) {
1228			if (mwifiex_space_avail_for_new_ba_stream(adapter)) {
1229				mwifiex_create_ba_tbl(priv, ptr->ra, tid,
1230						      BA_SETUP_INPROGRESS);
1231				mwifiex_send_addba(priv, tid, ptr->ra);
1232			} else if (mwifiex_find_stream_to_delete
1233				   (priv, tid, &tid_del, ra)) {
1234				mwifiex_create_ba_tbl(priv, ptr->ra, tid,
1235						      BA_SETUP_INPROGRESS);
1236				mwifiex_send_delba(priv, tid_del, ra, 1);
1237			}
1238		}
1239		if (enable_tx_amsdu && mwifiex_is_amsdu_allowed(priv, tid) &&
1240		    mwifiex_is_11n_aggragation_possible(priv, ptr,
1241							adapter->tx_buf_size))
1242			mwifiex_11n_aggregate_pkt(priv, ptr, ptr_index, flags);
1243			/* ra_list_spinlock has been freed in
1244			   mwifiex_11n_aggregate_pkt() */
1245		else
1246			mwifiex_send_single_packet(priv, ptr, ptr_index, flags);
1247			/* ra_list_spinlock has been freed in
1248			   mwifiex_send_single_packet() */
1249	}
1250	return 0;
1251}
1252
1253/*
1254 * This function transmits the highest priority packet awaiting in the
1255 * WMM Queues.
1256 */
1257void
1258mwifiex_wmm_process_tx(struct mwifiex_adapter *adapter)
1259{
1260	do {
1261		/* Check if busy */
1262		if (adapter->data_sent || adapter->tx_lock_flag)
1263			break;
1264
1265		if (mwifiex_dequeue_tx_packet(adapter))
1266			break;
1267	} while (!mwifiex_wmm_lists_empty(adapter));
1268}