wireless: mwifiex: initial commit for Marvell mwifiex driver

This driver adds WiFi support for Marvell 802.11n based chipsets
with SDIO interface. Currently only SD8787 is supported. More
chipsets will be supported later.

drivers/net/wireless/mwifiex/

Signed-off-by: Nishant Sarmukadam <nishants@marvell.com>
Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Kiran Divekar <dkiran@marvell.com>
Signed-off-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: Yogesh Ashok Powar <yogeshp@marvell.com>
Signed-off-by: Marc Yang <yangyang@marvell.com>
Signed-off-by: Ramesh Radhakrishnan <rramesh@marvell.com>
Signed-off-by: Frank Huang <frankh@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 1237 insertions, 0 deletions

diff --git a/drivers/net/wireless/mwifiex/wmm.c b/drivers/net/wireless/mwifiex/wmm.c
new file mode 100644
index 0000000..1cfbc6b
--- /dev/null
+++ b/drivers/net/wireless/mwifiex/wmm.c
@@ -0,0 +1,1237 @@
+/*
+ * 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, "
+	       "EcwMin=%d, EcwMax=%d, TxopLimit=%d\n",
+	       ac_str[wmm_aci_to_qidx_map[(ac_param->aci_aifsn_bitmap
+	       & MWIFIEX_ACI) >> 5]],
+	       (ac_param->aci_aifsn_bitmap & MWIFIEX_ACI) >> 5,
+	       (ac_param->aci_aifsn_bitmap & MWIFIEX_ACM) >> 4,
+	       ac_param->aci_aifsn_bitmap & MWIFIEX_AIFSN,
+	       ac_param->ecw_bitmap & MWIFIEX_ECW_MIN,
+	       (ac_param->ecw_bitmap & MWIFIEX_ECW_MAX) >> 4,
+	       le16_to_cpu(ac_param->tx_op_limit));
+}
+
+/*
+ * This function allocates a route address list.
+ *
+ * The function also initializes the list with the provided RA.
+ */
+static struct mwifiex_ra_list_tbl *
+mwifiex_wmm_allocate_ralist_node(struct mwifiex_adapter *adapter, 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",
+						__func__);
+		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;
+}
+
+/*
+ * 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;
+
+	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;
+
+		if (!mwifiex_queuing_ra_based(priv))
+			ra_list->is_11n_enabled = IS_11N_ENABLED(priv);
+		else
+			ra_list->is_11n_enabled = false;
+
+		dev_dbg(adapter->dev, "data: ralist %p: is_11n_enabled=%d\n",
+			ra_list, ra_list->is_11n_enabled);
+
+		list_add_tail(&ra_list->list,
+				&priv->wmm.tid_tbl_ptr[i].ra_list);
+
+		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
+mwifiex_wmm_queue_priorities_tid(struct mwifiex_private *priv,
+				 u8 queue_priority[])
+{
+	int i;
+
+	for (i = 0; i < 4; ++i) {
+		tos_to_tid[7 - (i * 2)] = ac_to_tid[queue_priority[i]][1];
+		tos_to_tid[6 - (i * 2)] = ac_to_tid[queue_priority[i]][0];
+	}
+}
+
+/*
+ * 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++) {
+		cw_min = (1 << (wmm_ie->ac_params[num_ac].ecw_bitmap &
+			MWIFIEX_ECW_MIN)) - 1;
+		avg_back_off = (cw_min >> 1) +
+			(wmm_ie->ac_params[num_ac].aci_aifsn_bitmap &
+			MWIFIEX_AIFSN);
+
+		ac_idx = wmm_aci_to_qidx_map[(wmm_ie->ac_params[num_ac].
+					     aci_aifsn_bitmap &
+					     MWIFIEX_ACI) >> 5];
+		priv->wmm.queue_priority[ac_idx] = ac_idx;
+		tmp[ac_idx] = avg_back_off;
+
+		dev_dbg(priv->adapter->dev, "info: WMM: CWmax=%d CWmin=%d Avg Back-off=%d\n",
+		       (1 << ((wmm_ie->ac_params[num_ac].ecw_bitmap &
+		       MWIFIEX_ECW_MAX) >> 4)) - 1,
+		       cw_min, avg_back_off);
+		mwifiex_wmm_ac_debug_print(&wmm_ie->ac_params[num_ac]);
+	}
+
+	/* Bubble sort */
+	for (i = 0; i < num_ac; i++) {
+		for (j = 1; j < num_ac - i; j++) {
+			if (tmp[j - 1] > tmp[j]) {
+				swap(tmp[j - 1], tmp[j]);
+				swap(priv->wmm.queue_priority[j - 1],
+				     priv->wmm.queue_priority[j]);
+			} else if (tmp[j - 1] == tmp[j]) {
+				if (priv->wmm.queue_priority[j - 1]
+				    < priv->wmm.queue_priority[j])
+					swap(priv->wmm.queue_priority[j - 1],
+					     priv->wmm.queue_priority[j]);
+			}
+		}
+	}
+
+	mwifiex_wmm_queue_priorities_tid(priv, priv->wmm.queue_priority);
+}
+
+/*
+ * This function evaluates whether or not an AC is to be downgraded.
+ *
+ * In case the AC is not enabled, the highest AC is returned that is
+ * enabled and does not require admission control.
+ */
+static enum mwifiex_wmm_ac_e
+mwifiex_wmm_eval_downgrade_ac(struct mwifiex_private *priv,
+			      enum mwifiex_wmm_ac_e eval_ac)
+{
+	int down_ac;
+	enum mwifiex_wmm_ac_e ret_ac;
+	struct mwifiex_wmm_ac_status *ac_status;
+
+	ac_status = &priv->wmm.ac_status[eval_ac];
+
+	if (!ac_status->disabled)
+		/* Okay to use this AC, its enabled */
+		return eval_ac;
+
+	/* Setup a default return value of the lowest priority */
+	ret_ac = WMM_AC_BK;
+
+	/*
+	 *  Find the highest AC that is enabled and does not require
+	 *  admission control. The spec disallows downgrading to an AC,
+	 *  which is enabled due to a completed admission control.
+	 *  Unadmitted traffic is not to be sent on an AC with admitted
+	 *  traffic.
+	 */
+	for (down_ac = WMM_AC_BK; down_ac < eval_ac; down_ac++) {
+		ac_status = &priv->wmm.ac_status[down_ac];
+
+		if (!ac_status->disabled && !ac_status->flow_required)
+			/* AC is enabled and does not require admission
+			   control */
+			ret_ac = (enum mwifiex_wmm_ac_e) down_ac;
+	}
+
+	return ret_ac;
+}
+
+/*
+ * This function downgrades WMM priority queue.
+ */
+void
+mwifiex_wmm_setup_ac_downgrade(struct mwifiex_private *priv)
+{
+	int ac_val;
+
+	dev_dbg(priv->adapter->dev, "info: WMM: AC Priorities:"
+			"BK(0), BE(1), VI(2), VO(3)\n");
+
+	if (!priv->wmm_enabled) {
+		/* WMM is not enabled, default priorities */
+		for (ac_val = WMM_AC_BK; ac_val <= WMM_AC_VO; ac_val++)
+			priv->wmm.ac_down_graded_vals[ac_val] =
+				(enum mwifiex_wmm_ac_e) ac_val;
+	} else {
+		for (ac_val = WMM_AC_BK; ac_val <= WMM_AC_VO; ac_val++) {
+			priv->wmm.ac_down_graded_vals[ac_val]
+				= mwifiex_wmm_eval_downgrade_ac(priv,
+						(enum mwifiex_wmm_ac_e) ac_val);
+			dev_dbg(priv->adapter->dev, "info: WMM: AC PRIO %d maps to %d\n",
+				ac_val, priv->wmm.ac_down_graded_vals[ac_val]);
+		}
+	}
+}
+
+/*
+ * This function converts the IP TOS field to an WMM AC
+ * Queue assignment.
+ */
+static enum mwifiex_wmm_ac_e
+mwifiex_wmm_convert_tos_to_ac(struct mwifiex_adapter *adapter, u32 tos)
+{
+	/* Map of TOS UP values to WMM AC */
+	const enum mwifiex_wmm_ac_e tos_to_ac[] = { WMM_AC_BE,
+		WMM_AC_BK,
+		WMM_AC_BK,
+		WMM_AC_BE,
+		WMM_AC_VI,
+		WMM_AC_VI,
+		WMM_AC_VO,
+		WMM_AC_VO
+	};
+
+	if (tos >= ARRAY_SIZE(tos_to_ac))
+		return WMM_AC_BE;
+
+	return tos_to_ac[tos];
+}
+
+/*
+ * This function evaluates a given TID and downgrades it to a lower
+ * TID if the WMM Parameter IE received from the AP indicates that the
+ * AP is disabled (due to call admission control (ACM bit). Mapping
+ * of TID to AC is taken care of internally.
+ */
+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
+			= priv->aggr_prio_tbl[6].ampdu_ap
+			= priv->aggr_prio_tbl[6].ampdu_user
+			= BA_STREAM_NOT_ALLOWED;
+
+		priv->aggr_prio_tbl[7].amsdu = priv->aggr_prio_tbl[7].ampdu_ap
+			= priv->aggr_prio_tbl[7].ampdu_user
+			= BA_STREAM_NOT_ALLOWED;
+
+		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;
+	}
+}
+
+/*
+ * This function checks if WMM Tx queue is empty.
+ */
+int
+mwifiex_wmm_lists_empty(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) {
+			for (i = 0; i < MAX_NUM_TID; i++)
+				if (!mwifiex_wmm_is_ra_list_empty(adapter,
+					     &priv->wmm.tid_tbl_ptr[i].ra_list))
+					return false;
+		}
+	}
+
+	return true;
+}
+
+/*
+ * This function deletes all packets in an RA list node.
+ *
+ * The packet sent completion callback handler are called with
+ * status failure, after they are dequeued to ensure proper
+ * cleanup. The RA list node itself is freed at the end.
+ */
+static void
+mwifiex_wmm_del_pkts_in_ralist_node(struct mwifiex_private *priv,
+				    struct mwifiex_ra_list_tbl *ra_list)
+{
+	struct mwifiex_adapter *adapter = priv->adapter;
+	struct sk_buff *skb, *tmp;
+
+	skb_queue_walk_safe(&ra_list->skb_head, skb, tmp)
+		mwifiex_write_data_complete(adapter, skb, -1);
+}
+
+/*
+ * This function deletes all packets in an RA list.
+ *
+ * Each nodes in the RA list are freed individually first, and then
+ * the RA list itself is freed.
+ */
+static void
+mwifiex_wmm_del_pkts_in_ralist(struct mwifiex_private *priv,
+			       struct list_head *ra_list_head)
+{
+	struct mwifiex_ra_list_tbl *ra_list;
+
+	list_for_each_entry(ra_list, ra_list_head, list)
+		mwifiex_wmm_del_pkts_in_ralist_node(priv, ra_list);
+}
+
+/*
+ * This function deletes all packets in all RA lists.
+ */
+static void mwifiex_wmm_cleanup_queues(struct mwifiex_private *priv)
+{
+	int i;
+
+	for (i = 0; i < MAX_NUM_TID; i++)
+		mwifiex_wmm_del_pkts_in_ralist(priv, &priv->wmm.tid_tbl_ptr[i].
+						     ra_list);
+}
+
+/*
+ * This function deletes all route addresses from all RA lists.
+ */
+static void mwifiex_wmm_delete_all_ralist(struct mwifiex_private *priv)
+{
+	struct mwifiex_ra_list_tbl *ra_list, *tmp_node;
+	int i;
+
+	for (i = 0; i < MAX_NUM_TID; ++i) {
+		dev_dbg(priv->adapter->dev,
+				"info: ra_list: freeing buf for tid %d\n", i);
+		list_for_each_entry_safe(ra_list, tmp_node,
+				&priv->wmm.tid_tbl_ptr[i].ra_list, list) {
+			list_del(&ra_list->list);
+			kfree(ra_list);
+		}
+
+		INIT_LIST_HEAD(&priv->wmm.tid_tbl_ptr[i].ra_list);
+
+		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));
+
+	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
+mwifiex_wmm_add_buf_txqueue(struct mwifiex_adapter *adapter,
+			    struct sk_buff *skb)
+{
+	struct mwifiex_txinfo *tx_info = MWIFIEX_SKB_TXCB(skb);
+	struct mwifiex_private *priv = adapter->priv[tx_info->bss_index];
+	u32 tid;
+	struct mwifiex_ra_list_tbl *ra_list;
+	u8 ra[ETH_ALEN], tid_down;
+	unsigned long flags;
+
+	if (!priv->media_connected) {
+		dev_dbg(adapter->dev, "data: drop packet in disconnect\n");
+		mwifiex_write_data_complete(adapter, skb, -1);
+		return;
+	}
+
+	tid = skb->priority;
+
+	spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
+
+	tid_down = mwifiex_wmm_downgrade_tid(priv, tid);
+
+	/* In case of infra as we have already created the list during
+	   association we just don't have to call get_queue_raptr, we will
+	   have only 1 raptr for a tid in case of infra */
+	if (!mwifiex_queuing_ra_based(priv)) {
+		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);
+		ra_list = mwifiex_wmm_get_queue_raptr(priv, tid_down, ra);
+	}
+
+	if (!ra_list) {
+		spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
+		mwifiex_write_data_complete(adapter, skb, -1);
+		return;
+	}
+
+	skb_queue_tail(&ra_list->skb_head, skb);
+
+	ra_list->total_pkts_size += skb->len;
+
+	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",
+			resp_len);
+
+	while ((resp_len >= sizeof(tlv_hdr->header)) && valid) {
+		tlv_hdr = (struct mwifiex_ie_types_data *) curr;
+		tlv_len = le16_to_cpu(tlv_hdr->header.len);
+
+		switch (le16_to_cpu(tlv_hdr->header.type)) {
+		case TLV_TYPE_WMMQSTATUS:
+			tlv_wmm_qstatus =
+				(struct mwifiex_ie_types_wmm_queue_status *)
+				tlv_hdr;
+			dev_dbg(priv->adapter->dev,
+				"info: CMD_RESP: WMM_GET_STATUS:"
+				" QSTATUS TLV: %d, %d, %d\n",
+			       tlv_wmm_qstatus->queue_index,
+			       tlv_wmm_qstatus->flow_required,
+			       tlv_wmm_qstatus->disabled);
+
+			ac_status = &priv->wmm.ac_status[tlv_wmm_qstatus->
+							 queue_index];
+			ac_status->disabled = tlv_wmm_qstatus->disabled;
+			ac_status->flow_required =
+				tlv_wmm_qstatus->flow_required;
+			ac_status->flow_created = tlv_wmm_qstatus->flow_created;
+			break;
+
+		case WLAN_EID_VENDOR_SPECIFIC:
+			/*
+			 * Point the regular IEEE IE 2 bytes into the Marvell IE
+			 *   and setup the IEEE IE type and length byte fields
+			 */
+
+			wmm_param_ie =
+				(struct ieee_types_wmm_parameter *) (curr +
+								    2);
+			wmm_param_ie->vend_hdr.len = (u8) tlv_len;
+			wmm_param_ie->vend_hdr.element_id =
+						WLAN_EID_VENDOR_SPECIFIC;
+
+			dev_dbg(priv->adapter->dev,
+				"info: CMD_RESP: WMM_GET_STATUS:"
+				" WMM Parameter Set Count: %d\n",
+				wmm_param_ie->qos_info_bitmap &
+				IEEE80211_WMM_IE_AP_QOSINFO_PARAM_SET_CNT_MASK);
+
+			memcpy((u8 *) &priv->curr_bss_params.bss_descriptor.
+			       wmm_ie, wmm_param_ie,
+			       wmm_param_ie->vend_hdr.len + 2);
+
+			break;
+
+		default:
+			valid = false;
+			break;
+		}
+
+		curr += (tlv_len + sizeof(tlv_hdr->header));
+		resp_len -= (tlv_len + sizeof(tlv_hdr->header));
+	}
+
+	mwifiex_wmm_setup_queue_priorities(priv, wmm_param_ie);
+	mwifiex_wmm_setup_ac_downgrade(priv);
+
+	return 0;
+}
+
+/*
+ * Callback handler from the command module to allow insertion of a WMM TLV.
+ *
+ * If the BSS we are associating to supports WMM, this function adds the
+ * required WMM Information IE to the association request command buffer in
+ * the form of a Marvell extended IEEE IE.
+ */
+u32
+mwifiex_wmm_process_association_req(struct mwifiex_private *priv,
+				    u8 **assoc_buf,
+				    struct ieee_types_wmm_parameter *wmm_ie,
+				    struct ieee80211_ht_cap *ht_cap)
+{
+	struct mwifiex_ie_types_wmm_param_set *wmm_tlv;
+	u32 ret_len = 0;
+
+	/* Null checks */
+	if (!assoc_buf)
+		return 0;
+	if (!(*assoc_buf))
+		return 0;
+
+	if (!wmm_ie)
+		return 0;
+
+	dev_dbg(priv->adapter->dev, "info: WMM: process assoc req:"
+			"bss->wmmIe=0x%x\n",
+			wmm_ie->vend_hdr.element_id);
+
+	if ((priv->wmm_required
+	     || (ht_cap && (priv->adapter->config_bands & BAND_GN
+		     || priv->adapter->config_bands & BAND_AN))
+	    )
+	    && wmm_ie->vend_hdr.element_id == WLAN_EID_VENDOR_SPECIFIC) {
+		wmm_tlv = (struct mwifiex_ie_types_wmm_param_set *) *assoc_buf;
+		wmm_tlv->header.type = cpu_to_le16((u16) wmm_info_ie[0]);
+		wmm_tlv->header.len = cpu_to_le16((u16) wmm_info_ie[1]);
+		memcpy(wmm_tlv->wmm_ie, &wmm_info_ie[2],
+			le16_to_cpu(wmm_tlv->header.len));
+		if (wmm_ie->qos_info_bitmap & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD)
+			memcpy((u8 *) (wmm_tlv->wmm_ie
+					+ le16_to_cpu(wmm_tlv->header.len)
+					 - sizeof(priv->wmm_qosinfo)),
+					&priv->wmm_qosinfo,
+					sizeof(priv->wmm_qosinfo));
+
+		ret_len = sizeof(wmm_tlv->header)
+			+ le16_to_cpu(wmm_tlv->header.len);
+
+		*assoc_buf += ret_len;
+	}
+
+	return ret_len;
+}
+
+/*
+ * This function computes the time delay in the driver queues for a
+ * given packet.
+ *
+ * When the packet is received at the OS/Driver interface, the current
+ * time is set in the packet structure. The difference between the present
+ * time and that received time is computed in this function and limited
+ * based on pre-compiled limits in the driver.
+ */
+u8
+mwifiex_wmm_compute_drv_pkt_delay(struct mwifiex_private *priv,
+					const struct sk_buff *skb)
+{
+	u8 ret_val = 0;
+	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;
+	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,
+				flags);
+		is_list_empty = list_empty(&adapter->bss_prio_tbl[j]
+				.bss_prio_head);
+		spin_unlock_irqrestore(&adapter->bss_prio_tbl[j].bss_prio_lock,
+				flags);
+		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) {
+			bssprio_node =
+				list_first_entry(&adapter->bss_prio_tbl[j]
+						 .bss_prio_head,
+						 struct mwifiex_bss_prio_node,
+						 list);
+			bssprio_head = bssprio_node;
+		} else {
+			bssprio_node = adapter->bss_prio_tbl[j].bss_prio_cur;
+			bssprio_head = bssprio_node;
+		}
+
+		do {
+			priv_tmp = bssprio_node->priv;
+
+			for (i = HIGH_PRIO_TID; i >= LOW_PRIO_TID; --i) {
+
+				tid_ptr = &(priv_tmp)->wmm.
+					tid_tbl_ptr[tos_to_tid[i]];
+
+				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);
+					if (!is_list_empty) {
+						*priv = priv_tmp;
+						*tid = tos_to_tid[i];
+						return ptr;
+					}
+					/* 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);
+			}
+
+			/* 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;
+}
+
+/*
+ * This function gets the number of packets in the Tx queue of a
+ * particular RA list.
+ */
+static int
+mwifiex_num_pkts_in_txq(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;
+
+	skb_queue_walk_safe(&ptr->skb_head, skb, tmp) {
+		total_size += skb->len;
+		if (total_size < max_buf_size)
+			++count;
+		else
+			break;
+	}
+
+	return count;
+}
+
+/*
+ * 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;
+	int status = 0;
+	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);
+
+	status = mwifiex_process_tx(priv, skb, &tx_param);
+
+	if (status == -EBUSY) {
+		/* Queue the packet back at the head */
+		spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags);
+
+		if (!mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
+			spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
+					       ra_list_flags);
+			mwifiex_write_data_complete(adapter, skb, -1);
+			return;
+		}
+
+		skb_queue_tail(&ptr->skb_head, skb);
+
+		ptr->total_pkts_size += skb->len;
+		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);
+		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);
+	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->data, skb->len, &tx_param);
+	switch (ret) {
+	case -EBUSY:
+		dev_dbg(adapter->dev, "data: -EBUSY is returned\n");
+		spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags);
+
+		if (!mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
+			spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
+					       ra_list_flags);
+			mwifiex_write_data_complete(adapter, skb, -1);
+			return;
+		}
+
+		skb_queue_tail(&ptr->skb_head, skb);
+
+		tx_info->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT;
+		spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
+				       ra_list_flags);
+		break;
+	case -1:
+		adapter->data_sent = false;
+		dev_err(adapter->dev, "host_to_card failed: %#x\n", ret);
+		adapter->dbg.num_tx_host_to_card_failure++;
+		mwifiex_write_data_complete(adapter, skb, ret);
+		break;
+	case -EINPROGRESS:
+		adapter->data_sent = false;
+	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);
+		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;
+
+	tid = mwifiex_get_tid(priv->adapter, ptr);
+
+	dev_dbg(adapter->dev, "data: tid=%d\n", tid);
+
+	spin_lock_irqsave(&priv->wmm.ra_list_spinlock, flags);
+	if (!mwifiex_is_ralist_valid(priv, ptr, ptr_index)) {
+		spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, flags);
+		return -1;
+	}
+
+	if (mwifiex_is_ptr_processed(priv, ptr)) {
+		mwifiex_send_processed_packet(priv, ptr, ptr_index, flags);
+		/* ra_list_spinlock has been freed in
+		   mwifiex_send_processed_packet() */
+		return 0;
+	}
+
+	if (!ptr->is_11n_enabled || mwifiex_is_ba_stream_setup(priv, ptr, tid)
+	    || ((priv->sec_info.wpa_enabled
+		  || priv->sec_info.wpa2_enabled) && !priv->wpa_is_gtk_set)
+		) {
+		mwifiex_send_single_packet(priv, ptr, ptr_index, flags);
+		/* ra_list_spinlock has been freed in
+		   mwifiex_send_single_packet() */
+	} else {
+		if (mwifiex_is_ampdu_allowed(priv, ptr, tid)) {
+			if (mwifiex_is_ba_stream_avail(priv)) {
+				mwifiex_11n_create_tx_ba_stream_tbl(priv,
+						ptr->ra, tid,
+						BA_STREAM_SETUP_INPROGRESS);
+				mwifiex_send_addba(priv, tid, ptr->ra);
+			} else if (mwifiex_find_stream_to_delete
+				   (priv, ptr, tid, &tid_del, ra)) {
+				mwifiex_11n_create_tx_ba_stream_tbl(priv,
+						ptr->ra, tid,
+						BA_STREAM_SETUP_INPROGRESS);
+				mwifiex_send_delba(priv, tid_del, ra, 1);
+			}
+		}
+/* Minimum number of AMSDU */
+#define MIN_NUM_AMSDU 2
+		if (mwifiex_is_amsdu_allowed(priv, ptr, tid) &&
+		    (mwifiex_num_pkts_in_txq(priv, ptr, adapter->tx_buf_size) >=
+		     MIN_NUM_AMSDU))
+			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;
+	} while (true);
+
+	return;
+}