diff mbox series

[v2,39/43] wifi: nxpwifi: add wmm.c

Message ID 20240809094533.1660-40-yu-hao.lin@nxp.com
State New
Headers show
Series wifi: nxpwifi: create nxpwifi to support iw61x | expand

Commit Message

David Lin Aug. 9, 2024, 9:45 a.m. UTC
---
 drivers/net/wireless/nxp/nxpwifi/wmm.c | 1379 ++++++++++++++++++++++++
 1 file changed, 1379 insertions(+)
 create mode 100644 drivers/net/wireless/nxp/nxpwifi/wmm.c
diff mbox series

Patch

diff --git a/drivers/net/wireless/nxp/nxpwifi/wmm.c b/drivers/net/wireless/nxp/nxpwifi/wmm.c
new file mode 100644
index 000000000000..d8ae54458096
--- /dev/null
+++ b/drivers/net/wireless/nxp/nxpwifi/wmm.c
@@ -0,0 +1,1379 @@ 
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * NXP Wireless LAN device driver: WMM
+ *
+ * Copyright 2011-2024 NXP
+ */
+
+#include "decl.h"
+#include "cfg.h"
+#include "util.h"
+#include "fw.h"
+#include "main.h"
+#include "wmm.h"
+#include "11n.h"
+
+/* Maximum value FW can accept for driver delay in packet transmission */
+#define DRV_PKT_DELAY_TO_FW_MAX   512
+
+#define WMM_QUEUED_PACKET_LOWER_LIMIT   180
+
+#define WMM_QUEUED_PACKET_UPPER_LIMIT   200
+
+/* Offset for TOS field in the IP header */
+#define IPTOS_OFFSET 5
+
+static bool disable_tx_amsdu;
+
+/* 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.
+ */
+const 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
+};
+
+/* WMM information IE */
+static const u8 wmm_info_ie[] = { WLAN_EID_VENDOR_SPECIFIC, 0x07,
+	0x00, 0x50, 0xf2, 0x02,
+	0x00, 0x01, 0x00
+};
+
+static const u8 wmm_aci_to_qidx_map[] = { WMM_AC_BE,
+	WMM_AC_BK,
+	WMM_AC_VI,
+	WMM_AC_VO
+};
+
+static u8 tos_to_tid[] = {
+	/* TID DSCP_P2 DSCP_P1 DSCP_P0 WMM_AC */
+	0x01,			/* 0 1 0 AC_BK */
+	0x02,			/* 0 0 0 AC_BK */
+	0x00,			/* 0 0 1 AC_BE */
+	0x03,			/* 0 1 1 AC_BE */
+	0x04,			/* 1 0 0 AC_VI */
+	0x05,			/* 1 0 1 AC_VI */
+	0x06,			/* 1 1 0 AC_VO */
+	0x07			/* 1 1 1 AC_VO */
+};
+
+static u8 ac_to_tid[4][2] = { {1, 2}, {0, 3}, {4, 5}, {6, 7} };
+
+/* This function debug prints the priority parameters for a WMM AC.
+ */
+static void
+nxpwifi_wmm_ac_debug_print(const struct ieee80211_wmm_ac_param *ac_param)
+{
+	static const char * const ac_str[] = { "BK", "BE", "VI", "VO" };
+
+	pr_debug("info: WMM AC_%s: ACI=%d, ACM=%d, Aifsn=%d, ",
+		 ac_str[wmm_aci_to_qidx_map[(ac_param->aci_aifsn
+					     & NXPWIFI_ACI) >> 5]],
+		 (ac_param->aci_aifsn & NXPWIFI_ACI) >> 5,
+		 (ac_param->aci_aifsn & NXPWIFI_ACM) >> 4,
+		 ac_param->aci_aifsn & NXPWIFI_AIFSN);
+	pr_debug("EcwMin=%d, EcwMax=%d, TxopLimit=%d\n",
+		 ac_param->cw & NXPWIFI_ECW_MIN,
+		 (ac_param->cw & NXPWIFI_ECW_MAX) >> 4,
+		 le16_to_cpu(ac_param->txop_limit));
+}
+
+/* This function allocates a route address list.
+ *
+ * The function also initializes the list with the provided RA.
+ */
+static struct nxpwifi_ra_list_tbl *
+nxpwifi_wmm_allocate_ralist_node(struct nxpwifi_adapter *adapter, const u8 *ra)
+{
+	struct nxpwifi_ra_list_tbl *ra_list;
+
+	ra_list = kzalloc(sizeof(*ra_list), GFP_ATOMIC);
+	if (!ra_list)
+		return NULL;
+
+	INIT_LIST_HEAD(&ra_list->list);
+	skb_queue_head_init(&ra_list->skb_head);
+
+	memcpy(ra_list->ra, ra, ETH_ALEN);
+
+	ra_list->total_pkt_count = 0;
+
+	nxpwifi_dbg(adapter, INFO, "info: allocated ra_list %p\n", ra_list);
+
+	return ra_list;
+}
+
+/* This function returns random no between 16 and 32 to be used as threshold
+ * for no of packets after which BA setup is initiated.
+ */
+static u8 nxpwifi_get_random_ba_threshold(void)
+{
+	u64 ns;
+	/* setup ba_packet_threshold here random number between
+	 * [BA_SETUP_PACKET_OFFSET,
+	 * BA_SETUP_PACKET_OFFSET+BA_SETUP_MAX_PACKET_THRESHOLD-1]
+	 */
+	ns = ktime_get_ns();
+	ns += (ns >> 32) + (ns >> 16);
+
+	return ((u8)ns % BA_SETUP_MAX_PACKET_THRESHOLD) + BA_SETUP_PACKET_OFFSET;
+}
+
+/* This function allocates and adds a RA list for all TIDs
+ * with the given RA.
+ */
+void nxpwifi_ralist_add(struct nxpwifi_private *priv, const u8 *ra)
+{
+	int i;
+	struct nxpwifi_ra_list_tbl *ra_list;
+	struct nxpwifi_adapter *adapter = priv->adapter;
+	struct nxpwifi_sta_node *node;
+
+	for (i = 0; i < MAX_NUM_TID; ++i) {
+		ra_list = nxpwifi_wmm_allocate_ralist_node(adapter, ra);
+		nxpwifi_dbg(adapter, INFO,
+			    "info: created ra_list %p\n", ra_list);
+
+		if (!ra_list)
+			break;
+
+		ra_list->is_11n_enabled = 0;
+		ra_list->ba_status = BA_SETUP_NONE;
+		ra_list->amsdu_in_ampdu = false;
+		if (!nxpwifi_queuing_ra_based(priv)) {
+			ra_list->is_11n_enabled = IS_11N_ENABLED(priv);
+		} else {
+			spin_lock_bh(&priv->sta_list_spinlock);
+			node = nxpwifi_get_sta_entry(priv, ra);
+			if (node)
+				ra_list->tx_paused = node->tx_pause;
+			ra_list->is_11n_enabled =
+				      nxpwifi_is_sta_11n_enabled(priv, node);
+			if (ra_list->is_11n_enabled)
+				ra_list->max_amsdu = node->max_amsdu;
+			spin_unlock_bh(&priv->sta_list_spinlock);
+		}
+
+		nxpwifi_dbg(adapter, DATA, "data: ralist %p: is_11n_enabled=%d\n",
+			    ra_list, ra_list->is_11n_enabled);
+
+		if (ra_list->is_11n_enabled) {
+			ra_list->ba_pkt_count = 0;
+			ra_list->ba_packet_thr =
+					      nxpwifi_get_random_ba_threshold();
+		}
+		list_add_tail(&ra_list->list,
+			      &priv->wmm.tid_tbl_ptr[i].ra_list);
+	}
+}
+
+/* This function sets the WMM queue priorities to their default values.
+ */
+static void nxpwifi_wmm_default_queue_priorities(struct nxpwifi_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
+nxpwifi_wmm_queue_priorities_tid(struct nxpwifi_private *priv)
+{
+	struct nxpwifi_wmm_desc *wmm = &priv->wmm;
+	u8 *queue_priority = wmm->queue_priority;
+	int i;
+
+	for (i = 0; i < 4; ++i) {
+		tos_to_tid[7 - (i * 2)] = ac_to_tid[queue_priority[i]][1];
+		tos_to_tid[6 - (i * 2)] = ac_to_tid[queue_priority[i]][0];
+	}
+
+	for (i = 0; i < MAX_NUM_TID; ++i)
+		priv->tos_to_tid_inv[tos_to_tid[i]] = (u8)i;
+
+	atomic_set(&wmm->highest_queued_prio, HIGH_PRIO_TID);
+}
+
+/* This function initializes WMM priority queues.
+ */
+void
+nxpwifi_wmm_setup_queue_priorities(struct nxpwifi_private *priv,
+				   struct ieee80211_wmm_param_ie *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 */
+		nxpwifi_wmm_default_queue_priorities(priv);
+		return;
+	}
+
+	nxpwifi_dbg(priv->adapter, INFO,
+		    "info: WMM Parameter IE: version=%d,\t"
+		    "qos_info Parameter Set Count=%d, Reserved=%#x\n",
+		    wmm_ie->version, wmm_ie->qos_info &
+		    IEEE80211_WMM_IE_AP_QOSINFO_PARAM_SET_CNT_MASK,
+		    wmm_ie->reserved);
+
+	for (num_ac = 0; num_ac < ARRAY_SIZE(wmm_ie->ac); num_ac++) {
+		u8 ecw = wmm_ie->ac[num_ac].cw;
+		u8 aci_aifsn = wmm_ie->ac[num_ac].aci_aifsn;
+
+		cw_min = (1 << (ecw & NXPWIFI_ECW_MIN)) - 1;
+		avg_back_off = (cw_min >> 1) + (aci_aifsn & NXPWIFI_AIFSN);
+
+		ac_idx = wmm_aci_to_qidx_map[(aci_aifsn & NXPWIFI_ACI) >> 5];
+		priv->wmm.queue_priority[ac_idx] = ac_idx;
+		tmp[ac_idx] = avg_back_off;
+
+		nxpwifi_dbg(priv->adapter, INFO,
+			    "info: WMM: CWmax=%d CWmin=%d Avg Back-off=%d\n",
+			    (1 << ((ecw & NXPWIFI_ECW_MAX) >> 4)) - 1,
+			    cw_min, avg_back_off);
+		nxpwifi_wmm_ac_debug_print(&wmm_ie->ac[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]);
+			}
+		}
+	}
+
+	nxpwifi_wmm_queue_priorities_tid(priv);
+}
+
+/* This function evaluates whether or not an AC is to be downgraded.
+ *
+ * In case the AC is not enabled, the highest AC is returned that is
+ * enabled and does not require admission control.
+ */
+static enum nxpwifi_wmm_ac_e
+nxpwifi_wmm_eval_downgrade_ac(struct nxpwifi_private *priv,
+			      enum nxpwifi_wmm_ac_e eval_ac)
+{
+	int down_ac;
+	enum nxpwifi_wmm_ac_e ret_ac;
+	struct nxpwifi_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 nxpwifi_wmm_ac_e)down_ac;
+	}
+
+	return ret_ac;
+}
+
+/* This function downgrades WMM priority queue.
+ */
+void
+nxpwifi_wmm_setup_ac_downgrade(struct nxpwifi_private *priv)
+{
+	int ac_val;
+
+	nxpwifi_dbg(priv->adapter, INFO, "info: WMM: AC Priorities:\t"
+		    "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 nxpwifi_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] =
+				nxpwifi_wmm_eval_downgrade_ac
+				(priv, (enum nxpwifi_wmm_ac_e)ac_val);
+			nxpwifi_dbg(priv->adapter, INFO,
+				    "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 nxpwifi_wmm_ac_e
+nxpwifi_wmm_convert_tos_to_ac(struct nxpwifi_adapter *adapter, u32 tos)
+{
+	/* Map of TOS UP values to WMM AC */
+	static const enum nxpwifi_wmm_ac_e tos_to_ac[] = {
+		WMM_AC_BE,
+		WMM_AC_BK,
+		WMM_AC_BK,
+		WMM_AC_BE,
+		WMM_AC_VI,
+		WMM_AC_VI,
+		WMM_AC_VO,
+		WMM_AC_VO
+	};
+
+	if (tos >= ARRAY_SIZE(tos_to_ac))
+		return WMM_AC_BE;
+
+	return tos_to_ac[tos];
+}
+
+/* This function evaluates a given TID and downgrades it to a lower
+ * TID if the WMM Parameter IE received from the AP indicates that the
+ * AP is disabled (due to call admission control (ACM bit). Mapping
+ * of TID to AC is taken care of internally.
+ */
+u8 nxpwifi_wmm_downgrade_tid(struct nxpwifi_private *priv, u32 tid)
+{
+	enum nxpwifi_wmm_ac_e ac, ac_down;
+	u8 new_tid;
+
+	ac = nxpwifi_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
+nxpwifi_wmm_init(struct nxpwifi_adapter *adapter)
+{
+	int i, j;
+	struct nxpwifi_private *priv;
+
+	for (j = 0; j < adapter->priv_num; ++j) {
+		priv = adapter->priv[j];
+		if (!priv)
+			continue;
+
+		for (i = 0; i < MAX_NUM_TID; ++i) {
+			if (!disable_tx_amsdu &&
+			    adapter->tx_buf_size > NXPWIFI_TX_DATA_BUF_SIZE_2K)
+				priv->aggr_prio_tbl[i].amsdu =
+							priv->tos_to_tid_inv[i];
+			else
+				priv->aggr_prio_tbl[i].amsdu =
+							BA_STREAM_NOT_ALLOWED;
+			priv->aggr_prio_tbl[i].ampdu_ap =
+							priv->tos_to_tid_inv[i];
+			priv->aggr_prio_tbl[i].ampdu_user =
+							priv->tos_to_tid_inv[i];
+		}
+
+		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;
+
+		nxpwifi_set_ba_params(priv);
+		nxpwifi_reset_11n_rx_seq_num(priv);
+
+		priv->wmm.drv_pkt_delay_max = NXPWIFI_WMM_DRV_DELAY_MAX;
+		atomic_set(&priv->wmm.tx_pkts_queued, 0);
+		atomic_set(&priv->wmm.highest_queued_prio, HIGH_PRIO_TID);
+	}
+}
+
+bool nxpwifi_bypass_txlist_empty(struct nxpwifi_adapter *adapter)
+{
+	struct nxpwifi_private *priv;
+	int i;
+
+	for (i = 0; i < adapter->priv_num; i++) {
+		priv = adapter->priv[i];
+		if (!priv)
+			continue;
+		if (!skb_queue_empty(&priv->bypass_txq))
+			return false;
+	}
+
+	return true;
+}
+
+/* This function checks if WMM Tx queue is empty.
+ */
+bool nxpwifi_wmm_lists_empty(struct nxpwifi_adapter *adapter)
+{
+	int i;
+	struct nxpwifi_private *priv;
+
+	for (i = 0; i < adapter->priv_num; ++i) {
+		priv = adapter->priv[i];
+		if (!priv)
+			continue;
+		if (!priv->port_open)
+			continue;
+		if (atomic_read(&priv->wmm.tx_pkts_queued))
+			return false;
+	}
+
+	return true;
+}
+
+/* This function deletes all packets in an RA list node.
+ *
+ * The packet sent completion callback handler are called with
+ * status failure, after they are dequeued to ensure proper
+ * cleanup. The RA list node itself is freed at the end.
+ */
+static void
+nxpwifi_wmm_del_pkts_in_ralist_node(struct nxpwifi_private *priv,
+				    struct nxpwifi_ra_list_tbl *ra_list)
+{
+	struct nxpwifi_adapter *adapter = priv->adapter;
+	struct sk_buff *skb, *tmp;
+
+	skb_queue_walk_safe(&ra_list->skb_head, skb, tmp) {
+		skb_unlink(skb, &ra_list->skb_head);
+		nxpwifi_write_data_complete(adapter, skb, 0, -1);
+	}
+}
+
+/* This function deletes all packets in an RA list.
+ *
+ * Each nodes in the RA list are freed individually first, and then
+ * the RA list itself is freed.
+ */
+static void
+nxpwifi_wmm_del_pkts_in_ralist(struct nxpwifi_private *priv,
+			       struct list_head *ra_list_head)
+{
+	struct nxpwifi_ra_list_tbl *ra_list;
+
+	list_for_each_entry(ra_list, ra_list_head, list)
+		nxpwifi_wmm_del_pkts_in_ralist_node(priv, ra_list);
+}
+
+/* This function deletes all packets in all RA lists.
+ */
+static void nxpwifi_wmm_cleanup_queues(struct nxpwifi_private *priv)
+{
+	int i;
+
+	for (i = 0; i < MAX_NUM_TID; i++)
+		nxpwifi_wmm_del_pkts_in_ralist
+		(priv, &priv->wmm.tid_tbl_ptr[i].ra_list);
+
+	atomic_set(&priv->wmm.tx_pkts_queued, 0);
+	atomic_set(&priv->wmm.highest_queued_prio, HIGH_PRIO_TID);
+}
+
+/* This function deletes all route addresses from all RA lists.
+ */
+static void nxpwifi_wmm_delete_all_ralist(struct nxpwifi_private *priv)
+{
+	struct nxpwifi_ra_list_tbl *ra_list, *tmp_node;
+	int i;
+
+	for (i = 0; i < MAX_NUM_TID; ++i) {
+		nxpwifi_dbg(priv->adapter, INFO,
+			    "info: ra_list: freeing buf for tid %d\n", i);
+		list_for_each_entry_safe(ra_list, tmp_node,
+					 &priv->wmm.tid_tbl_ptr[i].ra_list,
+					 list) {
+			list_del(&ra_list->list);
+			kfree(ra_list);
+		}
+
+		INIT_LIST_HEAD(&priv->wmm.tid_tbl_ptr[i].ra_list);
+	}
+}
+
+static int nxpwifi_free_ack_frame(int id, void *p, void *data)
+{
+	pr_warn("Have pending ack frames!\n");
+	kfree_skb(p);
+	return 0;
+}
+
+/* This function cleans up the Tx and Rx queues.
+ *
+ * Cleanup includes -
+ *      - All packets in RA lists
+ *      - All entries in Rx reorder table
+ *      - All entries in Tx BA stream table
+ *      - MPA buffer (if required)
+ *      - All RA lists
+ */
+void
+nxpwifi_clean_txrx(struct nxpwifi_private *priv)
+{
+	struct sk_buff *skb, *tmp;
+
+	nxpwifi_11n_cleanup_reorder_tbl(priv);
+	spin_lock_bh(&priv->wmm.ra_list_spinlock);
+
+	nxpwifi_wmm_cleanup_queues(priv);
+	nxpwifi_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);
+
+	nxpwifi_wmm_delete_all_ralist(priv);
+	memcpy(tos_to_tid, ac_to_tid, sizeof(tos_to_tid));
+
+	spin_unlock_bh(&priv->wmm.ra_list_spinlock);
+
+	skb_queue_walk_safe(&priv->bypass_txq, skb, tmp) {
+		skb_unlink(skb, &priv->bypass_txq);
+		nxpwifi_write_data_complete(priv->adapter, skb, 0, -1);
+	}
+	atomic_set(&priv->adapter->bypass_tx_pending, 0);
+
+	idr_for_each(&priv->ack_status_frames, nxpwifi_free_ack_frame, NULL);
+	idr_destroy(&priv->ack_status_frames);
+}
+
+/* This function retrieves a particular RA list node, matching with the
+ * given TID and RA address.
+ */
+struct nxpwifi_ra_list_tbl *
+nxpwifi_wmm_get_ralist_node(struct nxpwifi_private *priv, u8 tid,
+			    const u8 *ra_addr)
+{
+	struct nxpwifi_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;
+}
+
+void nxpwifi_update_ralist_tx_pause(struct nxpwifi_private *priv, u8 *mac,
+				    u8 tx_pause)
+{
+	struct nxpwifi_ra_list_tbl *ra_list;
+	u32 pkt_cnt = 0, tx_pkts_queued;
+	int i;
+
+	spin_lock_bh(&priv->wmm.ra_list_spinlock);
+
+	for (i = 0; i < MAX_NUM_TID; ++i) {
+		ra_list = nxpwifi_wmm_get_ralist_node(priv, i, mac);
+		if (ra_list && ra_list->tx_paused != tx_pause) {
+			pkt_cnt += ra_list->total_pkt_count;
+			ra_list->tx_paused = tx_pause;
+			if (tx_pause)
+				priv->wmm.pkts_paused[i] +=
+					ra_list->total_pkt_count;
+			else
+				priv->wmm.pkts_paused[i] -=
+					ra_list->total_pkt_count;
+		}
+	}
+
+	if (pkt_cnt) {
+		tx_pkts_queued = atomic_read(&priv->wmm.tx_pkts_queued);
+		if (tx_pause)
+			tx_pkts_queued -= pkt_cnt;
+		else
+			tx_pkts_queued += pkt_cnt;
+
+		atomic_set(&priv->wmm.tx_pkts_queued, tx_pkts_queued);
+		atomic_set(&priv->wmm.highest_queued_prio, HIGH_PRIO_TID);
+	}
+	spin_unlock_bh(&priv->wmm.ra_list_spinlock);
+}
+
+/* This function retrieves an RA list node for a given TID and
+ * RA address pair.
+ *
+ * If no such node is found, a new node is added first and then
+ * retrieved.
+ */
+struct nxpwifi_ra_list_tbl *
+nxpwifi_wmm_get_queue_raptr(struct nxpwifi_private *priv, u8 tid,
+			    const u8 *ra_addr)
+{
+	struct nxpwifi_ra_list_tbl *ra_list;
+
+	ra_list = nxpwifi_wmm_get_ralist_node(priv, tid, ra_addr);
+	if (ra_list)
+		return ra_list;
+	nxpwifi_ralist_add(priv, ra_addr);
+
+	return nxpwifi_wmm_get_ralist_node(priv, tid, ra_addr);
+}
+
+/* This function deletes RA list nodes for given mac for all TIDs.
+ * Function also decrements TX pending count accordingly.
+ */
+void
+nxpwifi_wmm_del_peer_ra_list(struct nxpwifi_private *priv, const u8 *ra_addr)
+{
+	struct nxpwifi_ra_list_tbl *ra_list;
+	int i;
+
+	spin_lock_bh(&priv->wmm.ra_list_spinlock);
+
+	for (i = 0; i < MAX_NUM_TID; ++i) {
+		ra_list = nxpwifi_wmm_get_ralist_node(priv, i, ra_addr);
+
+		if (!ra_list)
+			continue;
+		nxpwifi_wmm_del_pkts_in_ralist_node(priv, ra_list);
+		if (ra_list->tx_paused)
+			priv->wmm.pkts_paused[i] -= ra_list->total_pkt_count;
+		else
+			atomic_sub(ra_list->total_pkt_count,
+				   &priv->wmm.tx_pkts_queued);
+		list_del(&ra_list->list);
+		kfree(ra_list);
+	}
+	spin_unlock_bh(&priv->wmm.ra_list_spinlock);
+}
+
+/* This function checks if a particular RA list node exists in a given TID
+ * table index.
+ */
+bool nxpwifi_is_ralist_valid(struct nxpwifi_private *priv,
+			     struct nxpwifi_ra_list_tbl *ra_list, int ptr_index)
+{
+	struct nxpwifi_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 bypass TX queue.
+ * This is special TX queue for packets which can be sent even when port_open
+ * is false.
+ */
+void
+nxpwifi_wmm_add_buf_bypass_txqueue(struct nxpwifi_private *priv,
+				   struct sk_buff *skb)
+{
+	skb_queue_tail(&priv->bypass_txq, skb);
+}
+
+/* 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
+nxpwifi_wmm_add_buf_txqueue(struct nxpwifi_private *priv,
+			    struct sk_buff *skb)
+{
+	struct nxpwifi_adapter *adapter = priv->adapter;
+	u32 tid;
+	struct nxpwifi_ra_list_tbl *ra_list;
+	u8 ra[ETH_ALEN], tid_down;
+	struct ethhdr *eth_hdr = (struct ethhdr *)skb->data;
+
+	memcpy(ra, eth_hdr->h_dest, ETH_ALEN);
+
+	if (!priv->media_connected && !nxpwifi_is_skb_mgmt_frame(skb)) {
+		nxpwifi_dbg(adapter, DATA, "data: drop packet in disconnect\n");
+		nxpwifi_write_data_complete(adapter, skb, 0, -1);
+		return;
+	}
+
+	tid = skb->priority;
+
+	spin_lock_bh(&priv->wmm.ra_list_spinlock);
+
+	tid_down = nxpwifi_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
+	 */
+	memcpy(ra, skb->data, ETH_ALEN);
+	if (is_multicast_ether_addr(ra) || nxpwifi_is_skb_mgmt_frame(skb))
+		eth_broadcast_addr(ra);
+	ra_list = nxpwifi_wmm_get_queue_raptr(priv, tid_down, ra);
+
+	if (!ra_list) {
+		spin_unlock_bh(&priv->wmm.ra_list_spinlock);
+		nxpwifi_write_data_complete(adapter, skb, 0, -1);
+		return;
+	}
+
+	skb_queue_tail(&ra_list->skb_head, skb);
+
+	ra_list->ba_pkt_count++;
+	ra_list->total_pkt_count++;
+
+	if (atomic_read(&priv->wmm.highest_queued_prio) <
+						priv->tos_to_tid_inv[tid_down])
+		atomic_set(&priv->wmm.highest_queued_prio,
+			   priv->tos_to_tid_inv[tid_down]);
+
+	if (ra_list->tx_paused)
+		priv->wmm.pkts_paused[tid_down]++;
+	else
+		atomic_inc(&priv->wmm.tx_pkts_queued);
+
+	spin_unlock_bh(&priv->wmm.ra_list_spinlock);
+}
+
+/* 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 nxpwifi_ret_wmm_get_status(struct nxpwifi_private *priv,
+			       const struct host_cmd_ds_command *resp)
+{
+	u8 *curr = (u8 *)&resp->params.get_wmm_status;
+	u16 resp_len = le16_to_cpu(resp->size), tlv_len;
+	int mask = IEEE80211_WMM_IE_AP_QOSINFO_PARAM_SET_CNT_MASK;
+	bool valid = true;
+
+	struct nxpwifi_ie_types_data *tlv_hdr;
+	struct nxpwifi_ie_types_wmm_queue_status *wmm_qs;
+	struct ieee80211_wmm_param_ie *wmm_param_ie = NULL;
+	struct nxpwifi_wmm_ac_status *ac_status;
+
+	nxpwifi_dbg(priv->adapter, INFO,
+		    "info: WMM: WMM_GET_STATUS cmdresp received: %d\n",
+		    resp_len);
+
+	while ((resp_len >= sizeof(tlv_hdr->header)) && valid) {
+		tlv_hdr = (struct nxpwifi_ie_types_data *)curr;
+		tlv_len = le16_to_cpu(tlv_hdr->header.len);
+
+		if (resp_len < tlv_len + sizeof(tlv_hdr->header))
+			break;
+
+		switch (le16_to_cpu(tlv_hdr->header.type)) {
+		case TLV_TYPE_WMMQSTATUS:
+			wmm_qs = (struct nxpwifi_ie_types_wmm_queue_status *)
+				tlv_hdr;
+			nxpwifi_dbg(priv->adapter, CMD,
+				    "info: CMD_RESP: WMM_GET_STATUS:\t"
+				    "QSTATUS TLV: %d, %d, %d\n",
+				    wmm_qs->queue_index,
+				    wmm_qs->flow_required,
+				    wmm_qs->disabled);
+
+			ac_status = &priv->wmm.ac_status[wmm_qs->queue_index];
+			ac_status->disabled = wmm_qs->disabled;
+			ac_status->flow_required = wmm_qs->flow_required;
+			ac_status->flow_created = wmm_qs->flow_created;
+			break;
+
+		case WLAN_EID_VENDOR_SPECIFIC:
+			/* Point the regular IEEE IE 2 bytes into the NXP IE
+			 *   and setup the IEEE IE type and length byte fields
+			 */
+
+			wmm_param_ie =
+				(struct ieee80211_wmm_param_ie *)(curr + 2);
+			wmm_param_ie->len = (u8)tlv_len;
+			wmm_param_ie->element_id = WLAN_EID_VENDOR_SPECIFIC;
+
+			nxpwifi_dbg(priv->adapter, CMD,
+				    "info: CMD_RESP: WMM_GET_STATUS:\t"
+				    "WMM Parameter Set Count: %d\n",
+				    wmm_param_ie->qos_info & mask);
+
+			if (wmm_param_ie->len + 2 >
+				sizeof(struct ieee80211_wmm_param_ie))
+				break;
+
+			memcpy(&priv->curr_bss_params.bss_descriptor.wmm_ie,
+			       wmm_param_ie, wmm_param_ie->len + 2);
+
+			break;
+
+		default:
+			valid = false;
+			break;
+		}
+
+		curr += (tlv_len + sizeof(tlv_hdr->header));
+		resp_len -= (tlv_len + sizeof(tlv_hdr->header));
+	}
+
+	nxpwifi_wmm_setup_queue_priorities(priv, wmm_param_ie);
+	nxpwifi_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 NXP extended IEEE IE.
+ */
+u32
+nxpwifi_wmm_process_association_req(struct nxpwifi_private *priv,
+				    u8 **assoc_buf,
+				    struct ieee80211_wmm_param_ie *wmm_ie,
+				    struct ieee80211_ht_cap *ht_cap)
+{
+	struct nxpwifi_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;
+
+	nxpwifi_dbg(priv->adapter, INFO,
+		    "info: WMM: process assoc req: bss->wmm_ie=%#x\n",
+		    wmm_ie->element_id);
+
+	if ((priv->wmm_required ||
+	     (ht_cap && (priv->adapter->config_bands & BAND_GN ||
+	     priv->adapter->config_bands & BAND_AN))) &&
+	    wmm_ie->element_id == WLAN_EID_VENDOR_SPECIFIC) {
+		wmm_tlv = (struct nxpwifi_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 & 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
+nxpwifi_wmm_compute_drv_pkt_delay(struct nxpwifi_private *priv,
+				  const struct sk_buff *skb)
+{
+	u32 queue_delay = ktime_to_ms(net_timedelta(skb->tstamp));
+	u8 ret_val;
+
+	/* Queue delay is passed as a uint8 in units of 2ms (ms shifted
+	 *  by 1). Min value (other than 0) is therefore 2ms, max is 510ms.
+	 *
+	 * Pass max value if queue_delay is beyond the uint8 range
+	 */
+	ret_val = (u8)(min(queue_delay, priv->wmm.drv_pkt_delay_max) >> 1);
+
+	nxpwifi_dbg(priv->adapter, DATA, "data: WMM: Pkt Delay: %d ms,\t"
+		    "%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 nxpwifi_ra_list_tbl *
+nxpwifi_wmm_get_highest_priolist_ptr(struct nxpwifi_adapter *adapter,
+				     struct nxpwifi_private **priv, int *tid)
+{
+	struct nxpwifi_private *priv_tmp;
+	struct nxpwifi_ra_list_tbl *ptr;
+	struct nxpwifi_tid_tbl *tid_ptr;
+	atomic_t *hqp;
+	int i, j;
+	u8 to_tid;
+
+	/* check the BSS with highest priority first */
+	for (j = adapter->priv_num - 1; j >= 0; --j) {
+		/* iterate over BSS with the equal priority */
+		list_for_each_entry(adapter->bss_prio_tbl[j].bss_prio_cur,
+				    &adapter->bss_prio_tbl[j].bss_prio_head,
+				    list) {
+try_again:
+			priv_tmp = adapter->bss_prio_tbl[j].bss_prio_cur->priv;
+
+			if (!priv_tmp->port_open ||
+			    (atomic_read(&priv_tmp->wmm.tx_pkts_queued) == 0))
+				continue;
+
+			/* iterate over the WMM queues of the BSS */
+			hqp = &priv_tmp->wmm.highest_queued_prio;
+			for (i = atomic_read(hqp); i >= LOW_PRIO_TID; --i) {
+				spin_lock_bh(&priv_tmp->wmm.ra_list_spinlock);
+
+				to_tid = tos_to_tid[i];
+				tid_ptr = &(priv_tmp)->wmm.tid_tbl_ptr[to_tid];
+
+				/* iterate over receiver addresses */
+				list_for_each_entry(ptr, &tid_ptr->ra_list,
+						    list) {
+					if (!ptr->tx_paused &&
+					    !skb_queue_empty(&ptr->skb_head))
+						/* holds both locks */
+						goto found;
+				}
+
+				spin_unlock_bh(&priv_tmp->wmm.ra_list_spinlock);
+			}
+
+			if (atomic_read(&priv_tmp->wmm.tx_pkts_queued) != 0) {
+				atomic_set(&priv_tmp->wmm.highest_queued_prio,
+					   HIGH_PRIO_TID);
+				/* Iterate current private once more, since
+				 * there still exist packets in data queue
+				 */
+				goto try_again;
+			} else {
+				atomic_set(&priv_tmp->wmm.highest_queued_prio,
+					   NO_PKT_PRIO_TID);
+			}
+		}
+	}
+
+	return NULL;
+
+found:
+	/* holds ra_list_spinlock */
+	if (atomic_read(hqp) > i)
+		atomic_set(hqp, i);
+	spin_unlock_bh(&priv_tmp->wmm.ra_list_spinlock);
+
+	*priv = priv_tmp;
+	*tid = tos_to_tid[i];
+
+	return ptr;
+}
+
+/* This functions rotates ra and bss lists so packets are picked round robin.
+ *
+ * After a packet is successfully transmitted, rotate the ra list, so the ra
+ * next to the one transmitted, will come first in the list. This way we pick
+ * the ra' in a round robin fashion. Same applies to bss nodes of equal
+ * priority.
+ *
+ * Function also increments wmm.packets_out counter.
+ */
+void nxpwifi_rotate_priolists(struct nxpwifi_private *priv,
+			      struct nxpwifi_ra_list_tbl *ra,
+			      int tid)
+{
+	struct nxpwifi_adapter *adapter = priv->adapter;
+	struct nxpwifi_bss_prio_tbl *tbl = adapter->bss_prio_tbl;
+	struct nxpwifi_tid_tbl *tid_ptr = &priv->wmm.tid_tbl_ptr[tid];
+
+	spin_lock_bh(&tbl[priv->bss_priority].bss_prio_lock);
+	/* dirty trick: we remove 'head' temporarily and reinsert it after
+	 * curr bss node. imagine list to stay fixed while head is moved
+	 */
+	list_move(&tbl[priv->bss_priority].bss_prio_head,
+		  &tbl[priv->bss_priority].bss_prio_cur->list);
+	spin_unlock_bh(&tbl[priv->bss_priority].bss_prio_lock);
+
+	spin_lock_bh(&priv->wmm.ra_list_spinlock);
+	if (nxpwifi_is_ralist_valid(priv, ra, tid)) {
+		priv->wmm.packets_out[tid]++;
+		/* same as above */
+		list_move(&tid_ptr->ra_list, &ra->list);
+	}
+	spin_unlock_bh(&priv->wmm.ra_list_spinlock);
+}
+
+/* This function checks if 11n aggregation is possible.
+ */
+static bool
+nxpwifi_is_11n_aggragation_possible(struct nxpwifi_private *priv,
+				    struct nxpwifi_ra_list_tbl *ptr,
+				    int max_buf_size)
+{
+	int count = 0, total_size = 0;
+	struct sk_buff *skb, *tmp;
+	int max_amsdu_size;
+
+	if (priv->bss_role == NXPWIFI_BSS_ROLE_UAP && priv->ap_11n_enabled &&
+	    ptr->is_11n_enabled)
+		max_amsdu_size = min_t(int, ptr->max_amsdu, max_buf_size);
+	else
+		max_amsdu_size = max_buf_size;
+
+	skb_queue_walk_safe(&ptr->skb_head, skb, tmp) {
+		total_size += skb->len;
+		if (total_size >= max_amsdu_size)
+			break;
+		if (++count >= MIN_NUM_AMSDU)
+			return true;
+	}
+
+	return false;
+}
+
+/* This function sends a single packet to firmware for transmission.
+ */
+static void
+nxpwifi_send_single_packet(struct nxpwifi_private *priv,
+			   struct nxpwifi_ra_list_tbl *ptr, int ptr_index)
+__releases(&priv->wmm.ra_list_spinlock)
+{
+	struct sk_buff *skb, *skb_next;
+	struct nxpwifi_tx_param tx_param;
+	struct nxpwifi_adapter *adapter = priv->adapter;
+	struct nxpwifi_txinfo *tx_info;
+
+	if (skb_queue_empty(&ptr->skb_head)) {
+		spin_unlock_bh(&priv->wmm.ra_list_spinlock);
+		nxpwifi_dbg(adapter, DATA, "data: nothing to send\n");
+		return;
+	}
+
+	skb = skb_dequeue(&ptr->skb_head);
+
+	tx_info = NXPWIFI_SKB_TXCB(skb);
+	nxpwifi_dbg(adapter, DATA,
+		    "data: dequeuing the packet %p %p\n", ptr, skb);
+
+	ptr->total_pkt_count--;
+
+	if (!skb_queue_empty(&ptr->skb_head))
+		skb_next = skb_peek(&ptr->skb_head);
+	else
+		skb_next = NULL;
+
+	spin_unlock_bh(&priv->wmm.ra_list_spinlock);
+
+	tx_param.next_pkt_len = ((skb_next) ? skb_next->len +
+				sizeof(struct txpd) : 0);
+
+	if (nxpwifi_process_tx(priv, skb, &tx_param) == -EBUSY) {
+		/* Queue the packet back at the head */
+		spin_lock_bh(&priv->wmm.ra_list_spinlock);
+
+		if (!nxpwifi_is_ralist_valid(priv, ptr, ptr_index)) {
+			spin_unlock_bh(&priv->wmm.ra_list_spinlock);
+			nxpwifi_write_data_complete(adapter, skb, 0, -1);
+			return;
+		}
+
+		skb_queue_tail(&ptr->skb_head, skb);
+
+		ptr->total_pkt_count++;
+		ptr->ba_pkt_count++;
+		tx_info->flags |= NXPWIFI_BUF_FLAG_REQUEUED_PKT;
+		spin_unlock_bh(&priv->wmm.ra_list_spinlock);
+	} else {
+		nxpwifi_rotate_priolists(priv, ptr, ptr_index);
+		atomic_dec(&priv->wmm.tx_pkts_queued);
+	}
+}
+
+/* This function checks if the first packet in the given RA list
+ * is already processed or not.
+ */
+static bool
+nxpwifi_is_ptr_processed(struct nxpwifi_private *priv,
+			 struct nxpwifi_ra_list_tbl *ptr)
+{
+	struct sk_buff *skb;
+	struct nxpwifi_txinfo *tx_info;
+
+	if (skb_queue_empty(&ptr->skb_head))
+		return false;
+
+	skb = skb_peek(&ptr->skb_head);
+
+	tx_info = NXPWIFI_SKB_TXCB(skb);
+	if (tx_info->flags & NXPWIFI_BUF_FLAG_REQUEUED_PKT)
+		return true;
+
+	return false;
+}
+
+/* This function sends a single processed packet to firmware for
+ * transmission.
+ */
+static void
+nxpwifi_send_processed_packet(struct nxpwifi_private *priv,
+			      struct nxpwifi_ra_list_tbl *ptr, int ptr_index)
+				__releases(&priv->wmm.ra_list_spinlock)
+{
+	struct nxpwifi_tx_param tx_param;
+	struct nxpwifi_adapter *adapter = priv->adapter;
+	int ret;
+	struct sk_buff *skb, *skb_next;
+	struct nxpwifi_txinfo *tx_info;
+
+	if (skb_queue_empty(&ptr->skb_head)) {
+		spin_unlock_bh(&priv->wmm.ra_list_spinlock);
+		return;
+	}
+
+	skb = skb_dequeue(&ptr->skb_head);
+
+	if (adapter->data_sent || adapter->tx_lock_flag) {
+		ptr->total_pkt_count--;
+		spin_unlock_bh(&priv->wmm.ra_list_spinlock);
+		skb_queue_tail(&adapter->tx_data_q, skb);
+		atomic_dec(&priv->wmm.tx_pkts_queued);
+		atomic_inc(&adapter->tx_queued);
+		return;
+	}
+
+	if (!skb_queue_empty(&ptr->skb_head))
+		skb_next = skb_peek(&ptr->skb_head);
+	else
+		skb_next = NULL;
+
+	tx_info = NXPWIFI_SKB_TXCB(skb);
+
+	spin_unlock_bh(&priv->wmm.ra_list_spinlock);
+
+	tx_param.next_pkt_len =
+		((skb_next) ? skb_next->len +
+		 sizeof(struct txpd) : 0);
+
+	ret = adapter->if_ops.host_to_card(adapter, NXPWIFI_TYPE_DATA,
+					   skb, &tx_param);
+
+	switch (ret) {
+	case -EBUSY:
+		nxpwifi_dbg(adapter, ERROR, "data: -EBUSY is returned\n");
+		spin_lock_bh(&priv->wmm.ra_list_spinlock);
+
+		if (!nxpwifi_is_ralist_valid(priv, ptr, ptr_index)) {
+			spin_unlock_bh(&priv->wmm.ra_list_spinlock);
+			nxpwifi_write_data_complete(adapter, skb, 0, -1);
+			return;
+		}
+
+		skb_queue_tail(&ptr->skb_head, skb);
+
+		tx_info->flags |= NXPWIFI_BUF_FLAG_REQUEUED_PKT;
+		spin_unlock_bh(&priv->wmm.ra_list_spinlock);
+		break;
+	case -EINPROGRESS:
+		break;
+	case 0:
+		nxpwifi_write_data_complete(adapter, skb, 0, ret);
+		break;
+	default:
+		nxpwifi_dbg(adapter, ERROR, "host_to_card failed: %#x\n", ret);
+		adapter->dbg.num_tx_host_to_card_failure++;
+		nxpwifi_write_data_complete(adapter, skb, 0, ret);
+		break;
+	}
+
+	if (ret != -EBUSY) {
+		nxpwifi_rotate_priolists(priv, ptr, ptr_index);
+		atomic_dec(&priv->wmm.tx_pkts_queued);
+		spin_lock_bh(&priv->wmm.ra_list_spinlock);
+		ptr->total_pkt_count--;
+		spin_unlock_bh(&priv->wmm.ra_list_spinlock);
+	}
+}
+
+/* This function dequeues a packet from the highest priority list
+ * and transmits it.
+ */
+static int
+nxpwifi_dequeue_tx_packet(struct nxpwifi_adapter *adapter)
+{
+	struct nxpwifi_ra_list_tbl *ptr;
+	struct nxpwifi_private *priv = NULL;
+	int ptr_index = 0;
+	u8 ra[ETH_ALEN];
+	int tid_del = 0, tid = 0;
+
+	ptr = nxpwifi_wmm_get_highest_priolist_ptr(adapter, &priv, &ptr_index);
+	if (!ptr)
+		return -ENOENT;
+
+	tid = nxpwifi_get_tid(ptr);
+
+	nxpwifi_dbg(adapter, DATA, "data: tid=%d\n", tid);
+
+	spin_lock_bh(&priv->wmm.ra_list_spinlock);
+	if (!nxpwifi_is_ralist_valid(priv, ptr, ptr_index)) {
+		spin_unlock_bh(&priv->wmm.ra_list_spinlock);
+		return -EINVAL;
+	}
+
+	if (nxpwifi_is_ptr_processed(priv, ptr)) {
+		nxpwifi_send_processed_packet(priv, ptr, ptr_index);
+		/* ra_list_spinlock has been freed in
+		 * nxpwifi_send_processed_packet()
+		 */
+		return 0;
+	}
+
+	if (!ptr->is_11n_enabled ||
+	    ptr->ba_status ||
+	    priv->wps.session_enable) {
+		if (ptr->is_11n_enabled &&
+		    ptr->ba_status &&
+		    ptr->amsdu_in_ampdu &&
+		    nxpwifi_is_amsdu_allowed(priv, tid) &&
+		    nxpwifi_is_11n_aggragation_possible(priv, ptr,
+							adapter->tx_buf_size))
+			nxpwifi_11n_aggregate_pkt(priv, ptr, ptr_index);
+			/* ra_list_spinlock has been freed in
+			 * nxpwifi_11n_aggregate_pkt()
+			 */
+		else
+			nxpwifi_send_single_packet(priv, ptr, ptr_index);
+			/* ra_list_spinlock has been freed in
+			 * nxpwifi_send_single_packet()
+			 */
+	} else {
+		if (nxpwifi_is_ampdu_allowed(priv, ptr, tid) &&
+		    ptr->ba_pkt_count > ptr->ba_packet_thr) {
+			if (nxpwifi_space_avail_for_new_ba_stream(adapter)) {
+				nxpwifi_create_ba_tbl(priv, ptr->ra, tid,
+						      BA_SETUP_INPROGRESS);
+				nxpwifi_send_addba(priv, tid, ptr->ra);
+			} else if (nxpwifi_find_stream_to_delete
+				   (priv, tid, &tid_del, ra)) {
+				nxpwifi_create_ba_tbl(priv, ptr->ra, tid,
+						      BA_SETUP_INPROGRESS);
+				nxpwifi_send_delba(priv, tid_del, ra, 1);
+			}
+		}
+		if (nxpwifi_is_amsdu_allowed(priv, tid) &&
+		    nxpwifi_is_11n_aggragation_possible(priv, ptr,
+							adapter->tx_buf_size))
+			nxpwifi_11n_aggregate_pkt(priv, ptr, ptr_index);
+			/* ra_list_spinlock has been freed in
+			 * nxpwifi_11n_aggregate_pkt()
+			 */
+		else
+			nxpwifi_send_single_packet(priv, ptr, ptr_index);
+			/* ra_list_spinlock has been freed in
+			 * nxpwifi_send_single_packet()
+			 */
+	}
+	return 0;
+}
+
+void nxpwifi_process_bypass_tx(struct nxpwifi_adapter *adapter)
+{
+	struct nxpwifi_tx_param tx_param;
+	struct sk_buff *skb;
+	struct nxpwifi_txinfo *tx_info;
+	struct nxpwifi_private *priv;
+	int i;
+
+	if (adapter->data_sent || adapter->tx_lock_flag)
+		return;
+
+	for (i = 0; i < adapter->priv_num; ++i) {
+		priv = adapter->priv[i];
+
+		if (!priv)
+			continue;
+
+		if (skb_queue_empty(&priv->bypass_txq))
+			continue;
+
+		skb = skb_dequeue(&priv->bypass_txq);
+		tx_info = NXPWIFI_SKB_TXCB(skb);
+
+		/* no aggregation for bypass packets */
+		tx_param.next_pkt_len = 0;
+
+		if (nxpwifi_process_tx(priv, skb, &tx_param) == -EBUSY) {
+			skb_queue_head(&priv->bypass_txq, skb);
+			tx_info->flags |= NXPWIFI_BUF_FLAG_REQUEUED_PKT;
+		} else {
+			atomic_dec(&adapter->bypass_tx_pending);
+		}
+	}
+}
+
+/* This function transmits the highest priority packet awaiting in the
+ * WMM Queues.
+ */
+void
+nxpwifi_wmm_process_tx(struct nxpwifi_adapter *adapter)
+{
+	do {
+		if (nxpwifi_dequeue_tx_packet(adapter))
+			break;
+		if (adapter->iface_type != NXPWIFI_SDIO) {
+			if (adapter->data_sent ||
+			    adapter->tx_lock_flag)
+				break;
+		} else {
+			if (atomic_read(&adapter->tx_queued) >=
+			    NXPWIFI_MAX_PKTS_TXQ)
+				break;
+		}
+	} while (!nxpwifi_wmm_lists_empty(adapter));
+}