wmm.c 35.8 KB
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/*
 * Marvell Wireless LAN device driver: WMM
 *
 * Copyright (C) 2011, 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

/* 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 */
};

/*
 * This table inverses the tos_to_tid operation to get a priority
 * which is in sequential order, and can be compared.
 * Use this to compare the priority of two different TIDs.
 */
static u8 tos_to_tid_inv[] = {
	0x02,  /* from tos_to_tid[2] = 0 */
	0x00,  /* from tos_to_tid[0] = 1 */
	0x01,  /* from tos_to_tid[1] = 2 */
	0x03,
	0x04,
	0x05,
	0x06,
	0x07};

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, "
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		 "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));
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}

/*
 * 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, u8 *ra)
{
	struct mwifiex_ra_list_tbl *ra_list;

	ra_list = kzalloc(sizeof(struct mwifiex_ra_list_tbl), GFP_ATOMIC);

	if (!ra_list) {
		dev_err(adapter->dev, "%s: failed to alloc ra_list\n",
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			__func__);
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		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_pkts_size = 0;

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

	return ra_list;
}

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/* 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;
}

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

	spin_lock_irqsave(&priv->sta_list_spinlock, flags);
	node = mwifiex_get_sta_entry(priv, ra);
	spin_unlock_irqrestore(&priv->sta_list_spinlock, flags);
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	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;

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		ra_list->is_11n_enabled = 0;
		if (!mwifiex_queuing_ra_based(priv)) {
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			ra_list->is_11n_enabled = IS_11N_ENABLED(priv);
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		} else {
			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;
		}
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		dev_dbg(adapter->dev, "data: ralist %p: is_11n_enabled=%d\n",
			ra_list, ra_list->is_11n_enabled);

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		if (ra_list->is_11n_enabled) {
			ra_list->pkt_count = 0;
			ra_list->ba_packet_thr =
					      mwifiex_get_random_ba_threshold();
		}
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		list_add_tail(&ra_list->list,
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			      &priv->wmm.tid_tbl_ptr[i].ra_list);
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		if (!priv->wmm.tid_tbl_ptr[i].ra_list_curr)
			priv->wmm.tid_tbl_ptr[i].ra_list_curr = 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
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mwifiex_wmm_queue_priorities_tid(struct mwifiex_wmm_desc *wmm)
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{
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	u8 *queue_priority = wmm->queue_priority;
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	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];
	}
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	for (i = 0; i < MAX_NUM_TID; ++i)
		tos_to_tid_inv[tos_to_tid[i]] = (u8)i;

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

/*
 * 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++) {
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		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];
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		priv->wmm.queue_priority[ac_idx] = ac_idx;
		tmp[ac_idx] = avg_back_off;

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		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);
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		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]);
			}
		}
	}

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	mwifiex_wmm_queue_priorities_tid(&priv->wmm);
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}

/*
 * 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] =
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						(enum mwifiex_wmm_ac_e) ac_val;
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	} 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);
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			dev_dbg(priv->adapter->dev,
				"info: WMM: AC PRIO %d maps to %d\n",
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				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.
 */
static 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) {
			priv->aggr_prio_tbl[i].amsdu = tos_to_tid_inv[i];
			priv->aggr_prio_tbl[i].ampdu_ap = tos_to_tid_inv[i];
			priv->aggr_prio_tbl[i].ampdu_user = tos_to_tid_inv[i];
			priv->wmm.tid_tbl_ptr[i].ra_list_curr = NULL;
		}

		priv->aggr_prio_tbl[6].amsdu
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					= priv->aggr_prio_tbl[6].ampdu_ap
					= priv->aggr_prio_tbl[6].ampdu_user
					= BA_STREAM_NOT_ALLOWED;
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		priv->aggr_prio_tbl[7].amsdu = priv->aggr_prio_tbl[7].ampdu_ap
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					= priv->aggr_prio_tbl[7].ampdu_user
					= BA_STREAM_NOT_ALLOWED;
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		priv->add_ba_param.timeout = MWIFIEX_DEFAULT_BLOCK_ACK_TIMEOUT;
		priv->add_ba_param.tx_win_size = MWIFIEX_AMPDU_DEF_TXWINSIZE;
		priv->add_ba_param.rx_win_size = MWIFIEX_AMPDU_DEF_RXWINSIZE;
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		mwifiex_reset_11n_rx_seq_num(priv);

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

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

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

	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)
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		mwifiex_write_data_complete(adapter, skb, 0, -1);
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}

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

/*
 * 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,
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			"info: ra_list: freeing buf for tid %d\n", i);
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		list_for_each_entry_safe(ra_list, tmp_node,
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					 &priv->wmm.tid_tbl_ptr[i].ra_list,
					 list) {
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			list_del(&ra_list->list);
			kfree(ra_list);
		}

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

		priv->wmm.tid_tbl_ptr[i].ra_list_curr = NULL;
	}
}

/*
 * 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;

	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));

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

/*
 * 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,
			    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.
 */
static struct mwifiex_ra_list_tbl *
mwifiex_wmm_get_queue_raptr(struct mwifiex_private *priv, u8 tid, 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 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
644
mwifiex_wmm_add_buf_txqueue(struct mwifiex_private *priv,
645 646
			    struct sk_buff *skb)
{
647
	struct mwifiex_adapter *adapter = priv->adapter;
648 649 650 651 652
	u32 tid;
	struct mwifiex_ra_list_tbl *ra_list;
	u8 ra[ETH_ALEN], tid_down;
	unsigned long flags;

653
	if (!priv->media_connected && !mwifiex_is_skb_mgmt_frame(skb)) {
654
		dev_dbg(adapter->dev, "data: drop packet in disconnect\n");
A
Avinash Patil 已提交
655
		mwifiex_write_data_complete(adapter, skb, 0, -1);
656 657 658 659 660 661 662 663 664 665 666 667
		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 */
668 669
	if (!mwifiex_queuing_ra_based(priv) &&
	    !mwifiex_is_skb_mgmt_frame(skb)) {
670 671 672 673 674 675 676 677
		if (!list_empty(&priv->wmm.tid_tbl_ptr[tid_down].ra_list))
			ra_list = list_first_entry(
				&priv->wmm.tid_tbl_ptr[tid_down].ra_list,
				struct mwifiex_ra_list_tbl, list);
		else
			ra_list = NULL;
	} else {
		memcpy(ra, skb->data, ETH_ALEN);
678
		if (ra[0] & 0x01 || mwifiex_is_skb_mgmt_frame(skb))
679
			memset(ra, 0xff, ETH_ALEN);
680 681 682 683 684
		ra_list = mwifiex_wmm_get_queue_raptr(priv, tid_down, ra);
	}

	if (!ra_list) {
		spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
A
Avinash Patil 已提交
685
		mwifiex_write_data_complete(adapter, skb, 0, -1);
686 687 688 689 690 691
		return;
	}

	skb_queue_tail(&ra_list->skb_head, skb);

	ra_list->total_pkts_size += skb->len;
692
	ra_list->pkt_count++;
693

694 695
	atomic_inc(&priv->wmm.tx_pkts_queued);

696 697 698
	if (atomic_read(&priv->wmm.highest_queued_prio) <
						tos_to_tid_inv[tid_down])
		atomic_set(&priv->wmm.highest_queued_prio,
699
			   tos_to_tid_inv[tid_down]);
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
	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;
	int 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",
728
		resp_len);
729 730 731 732 733 734 735 736 737 738 739 740 741

	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);

		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",
742 743 744
				tlv_wmm_qstatus->queue_index,
				tlv_wmm_qstatus->flow_required,
				tlv_wmm_qstatus->disabled);
745 746 747 748 749

			ac_status = &priv->wmm.ac_status[tlv_wmm_qstatus->
							 queue_index];
			ac_status->disabled = tlv_wmm_qstatus->disabled;
			ac_status->flow_required =
750
						tlv_wmm_qstatus->flow_required;
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
			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;

819 820 821
	dev_dbg(priv->adapter->dev,
		"info: WMM: process assoc req: bss->wmm_ie=%#x\n",
		wmm_ie->vend_hdr.element_id);
822

823 824 825 826
	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) {
827 828 829 830
		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],
831
		       le16_to_cpu(wmm_tlv->header.len));
832 833
		if (wmm_ie->qos_info_bitmap & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD)
			memcpy((u8 *) (wmm_tlv->wmm_ie
834 835 836
				       + le16_to_cpu(wmm_tlv->header.len)
				       - sizeof(priv->wmm_qosinfo)),
			       &priv->wmm_qosinfo, sizeof(priv->wmm_qosinfo));
837 838

		ret_len = sizeof(wmm_tlv->header)
839
			  + le16_to_cpu(wmm_tlv->header.len);
840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857

		*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,
858
				  const struct sk_buff *skb)
859
{
860
	u8 ret_val;
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
	struct timeval out_tstamp, in_tstamp;
	u32 queue_delay;

	do_gettimeofday(&out_tstamp);
	in_tstamp = ktime_to_timeval(skb->tstamp);

	queue_delay = (out_tstamp.tv_sec - in_tstamp.tv_sec) * 1000;
	queue_delay += (out_tstamp.tv_usec - in_tstamp.tv_usec) / 1000;

	/*
	 * 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, *head;
	struct mwifiex_bss_prio_node *bssprio_node, *bssprio_head;
	struct mwifiex_tid_tbl *tid_ptr;
895
	atomic_t *hqp;
896 897 898 899 900 901
	int is_list_empty;
	unsigned long flags;
	int i, j;

	for (j = adapter->priv_num - 1; j >= 0; --j) {
		spin_lock_irqsave(&adapter->bss_prio_tbl[j].bss_prio_lock,
902
				  flags);
903
		is_list_empty = list_empty(&adapter->bss_prio_tbl[j]
904
					   .bss_prio_head);
905
		spin_unlock_irqrestore(&adapter->bss_prio_tbl[j].bss_prio_lock,
906
				       flags);
907 908 909 910 911 912
		if (is_list_empty)
			continue;

		if (adapter->bss_prio_tbl[j].bss_prio_cur ==
		    (struct mwifiex_bss_prio_node *)
		    &adapter->bss_prio_tbl[j].bss_prio_head) {
913
			adapter->bss_prio_tbl[j].bss_prio_cur =
914 915 916 917 918 919
				list_first_entry(&adapter->bss_prio_tbl[j]
						 .bss_prio_head,
						 struct mwifiex_bss_prio_node,
						 list);
		}

920 921 922
		bssprio_node = adapter->bss_prio_tbl[j].bss_prio_cur;
		bssprio_head = bssprio_node;

923 924
		do {
			priv_tmp = bssprio_node->priv;
925
			hqp = &priv_tmp->wmm.highest_queued_prio;
926

927
			for (i = atomic_read(hqp); i >= LOW_PRIO_TID; --i) {
928 929 930 931

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

932 933 934 935
				/* For non-STA ra_list_curr may be NULL */
				if (!tid_ptr->ra_list_curr)
					continue;

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
				spin_lock_irqsave(&tid_ptr->tid_tbl_lock,
						  flags);
				is_list_empty =
					list_empty(&adapter->bss_prio_tbl[j]
						   .bss_prio_head);
				spin_unlock_irqrestore(&tid_ptr->tid_tbl_lock,
						       flags);
				if (is_list_empty)
					continue;

				/*
				 * Always choose the next ra we transmitted
				 * last time, this way we pick the ra's in
				 * round robin fashion.
				 */
				ptr = list_first_entry(
						&tid_ptr->ra_list_curr->list,
						struct mwifiex_ra_list_tbl,
						list);

				head = ptr;
				if (ptr == (struct mwifiex_ra_list_tbl *)
						&tid_ptr->ra_list) {
					/* Get next ra */
					ptr = list_first_entry(&ptr->list,
					    struct mwifiex_ra_list_tbl, list);
					head = ptr;
				}

				do {
					is_list_empty =
						skb_queue_empty(&ptr->skb_head);
968 969 970 971

					if (!is_list_empty)
						goto found;

972 973 974 975 976 977 978 979 980 981 982 983 984 985
					/* Get next ra */
					ptr = list_first_entry(&ptr->list,
						 struct mwifiex_ra_list_tbl,
						 list);
					if (ptr ==
					    (struct mwifiex_ra_list_tbl *)
					    &tid_ptr->ra_list)
						ptr = list_first_entry(
						    &ptr->list,
						    struct mwifiex_ra_list_tbl,
						    list);
				} while (ptr != head);
			}

986 987 988 989 990 991
			/* No packet at any TID for this priv. Mark as such
			 * to skip checking TIDs for this priv (until pkt is
			 * added).
			 */
			atomic_set(hqp, NO_PKT_PRIO_TID);

992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007
			/* Get next bss priority node */
			bssprio_node = list_first_entry(&bssprio_node->list,
						struct mwifiex_bss_prio_node,
						list);

			if (bssprio_node ==
			    (struct mwifiex_bss_prio_node *)
			    &adapter->bss_prio_tbl[j].bss_prio_head)
				/* Get next bss priority node */
				bssprio_node = list_first_entry(
						&bssprio_node->list,
						struct mwifiex_bss_prio_node,
						list);
		} while (bssprio_node != bssprio_head);
	}
	return NULL;
1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018

found:
	spin_lock_irqsave(&priv_tmp->wmm.ra_list_spinlock, flags);
	if (atomic_read(hqp) > i)
		atomic_set(hqp, i);
	spin_unlock_irqrestore(&priv_tmp->wmm.ra_list_spinlock, flags);

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

	return ptr;
1019 1020
}

1021 1022 1023 1024 1025 1026 1027 1028 1029 1030
/*
 * 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;
1031 1032 1033 1034 1035 1036 1037
	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;
1038 1039 1040

	skb_queue_walk_safe(&ptr->skb_head, skb, tmp) {
		total_size += skb->len;
1041
		if (total_size >= max_amsdu_size)
1042 1043 1044 1045 1046 1047 1048 1049
			break;
		if (++count >= MIN_NUM_AMSDU)
			return true;
	}

	return false;
}

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
/*
 * 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_pkts_size -= skb->len;

	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);

1088
	if (mwifiex_process_tx(priv, skb, &tx_param) == -EBUSY) {
1089 1090 1091 1092 1093 1094
		/* 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);
A
Avinash Patil 已提交
1095
			mwifiex_write_data_complete(adapter, skb, 0, -1);
1096 1097 1098 1099 1100 1101
			return;
		}

		skb_queue_tail(&ptr->skb_head, skb);

		ptr->total_pkts_size += skb->len;
1102
		ptr->pkt_count++;
1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117
		tx_info->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT;
		spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
				       ra_list_flags);
	} else {
		spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags);
		if (mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
			priv->wmm.packets_out[ptr_index]++;
			priv->wmm.tid_tbl_ptr[ptr_index].ra_list_curr = ptr;
		}
		adapter->bss_prio_tbl[priv->bss_priority].bss_prio_cur =
			list_first_entry(
				&adapter->bss_prio_tbl[priv->bss_priority]
				.bss_prio_cur->list,
				struct mwifiex_bss_prio_node,
				list);
1118
		atomic_dec(&priv->wmm.tx_pkts_queued);
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
		spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
				       ra_list_flags);
	}
}

/*
 * 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);
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	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);
	}

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	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);
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			mwifiex_write_data_complete(adapter, skb, 0, -1);
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			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:
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		if (adapter->iface_type != MWIFIEX_PCIE)
			adapter->data_sent = false;
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		dev_err(adapter->dev, "host_to_card failed: %#x\n", ret);
		adapter->dbg.num_tx_host_to_card_failure++;
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		mwifiex_write_data_complete(adapter, skb, 0, ret);
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		break;
	case -EINPROGRESS:
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		if (adapter->iface_type != MWIFIEX_PCIE)
			adapter->data_sent = false;
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	default:
		break;
	}
	if (ret != -EBUSY) {
		spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags);
		if (mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
			priv->wmm.packets_out[ptr_index]++;
			priv->wmm.tid_tbl_ptr[ptr_index].ra_list_curr = ptr;
		}
		adapter->bss_prio_tbl[priv->bss_priority].bss_prio_cur =
			list_first_entry(
				&adapter->bss_prio_tbl[priv->bss_priority]
				.bss_prio_cur->list,
				struct mwifiex_bss_prio_node,
				list);
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		atomic_dec(&priv->wmm.tx_pkts_queued);
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		spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
				       ra_list_flags);
	}
}

/*
 * 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;

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	tid = mwifiex_get_tid(ptr);
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	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;
	}

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	if (!ptr->is_11n_enabled ||
	    mwifiex_is_ba_stream_setup(priv, ptr, tid) ||
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	    priv->wps.session_enable ||
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	    ((priv->sec_info.wpa_enabled ||
	      priv->sec_info.wpa2_enabled) &&
	     !priv->wpa_is_gtk_set)) {
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		mwifiex_send_single_packet(priv, ptr, ptr_index, flags);
		/* ra_list_spinlock has been freed in
		   mwifiex_send_single_packet() */
	} else {
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		if (mwifiex_is_ampdu_allowed(priv, tid) &&
		    ptr->pkt_count > ptr->ba_packet_thr) {
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			if (mwifiex_space_avail_for_new_ba_stream(adapter)) {
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				mwifiex_create_ba_tbl(priv, ptr->ra, tid,
						      BA_SETUP_INPROGRESS);
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				mwifiex_send_addba(priv, tid, ptr->ra);
			} else if (mwifiex_find_stream_to_delete
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				   (priv, tid, &tid_del, ra)) {
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				mwifiex_create_ba_tbl(priv, ptr->ra, tid,
						      BA_SETUP_INPROGRESS);
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				mwifiex_send_delba(priv, tid_del, ra, 1);
			}
		}
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		if (mwifiex_is_amsdu_allowed(priv, tid) &&
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		    mwifiex_is_11n_aggragation_possible(priv, ptr,
							adapter->tx_buf_size))
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			mwifiex_11n_aggregate_pkt(priv, ptr, INTF_HEADER_LEN,
						  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;
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	} while (!mwifiex_wmm_lists_empty(adapter));
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}