drivers/net/wireless/ath/wcn36xx/txrx.c - vendor/opensource/backports - Git at Google

 /*
  * Copyright (c) 2013 Eugene Krasnikov <k.eugene.e@gmail.com>
  *
  * Permission to use, copy, modify, and/or distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
  * copyright notice and this permission notice appear in all copies.
  *
  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
  * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */

 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

 #include "txrx.h"

 static inline int get_rssi0(struct wcn36xx_rx_bd *bd)
 {
 	return 100 - ((bd->phy_stat0 >> 24) & 0xff);
 }

 int wcn36xx_rx_skb(struct wcn36xx *wcn, struct sk_buff *skb)
 {
 	struct ieee80211_rx_status status;
 	struct ieee80211_hdr *hdr;
 	struct wcn36xx_rx_bd *bd;
 	u16 fc, sn;

 	/*
 	 * All fields must be 0, otherwise it can lead to
 	 * unexpected consequences.
 	 */
 	memset(&status, 0, sizeof(status));

 	bd = (struct wcn36xx_rx_bd *)skb->data;
 	buff_to_be((u32 *)bd, sizeof(*bd)/sizeof(u32));
 	wcn36xx_dbg_dump(WCN36XX_DBG_RX_DUMP,
 			 "BD   <<< ", (char *)bd,
 			 sizeof(struct wcn36xx_rx_bd));

 	skb_put(skb, bd->pdu.mpdu_header_off + bd->pdu.mpdu_len);
 	skb_pull(skb, bd->pdu.mpdu_header_off);

 	status.mactime = 10;
 	status.freq = WCN36XX_CENTER_FREQ(wcn);
 	status.band = WCN36XX_BAND(wcn);
 	status.signal = -get_rssi0(bd);
 	status.antenna = 1;
 	status.rate_idx = 1;
 	status.flag = 0;
 	status.rx_flags = 0;
 	status.flag |= RX_FLAG_IV_STRIPPED |
 		       RX_FLAG_MMIC_STRIPPED |
 		       RX_FLAG_DECRYPTED;

 	wcn36xx_dbg(WCN36XX_DBG_RX, "status.flags=%x\n", status.flag);

 	memcpy(IEEE80211_SKB_RXCB(skb), &status, sizeof(status));

 	hdr = (struct ieee80211_hdr *) skb->data;
 	fc = __le16_to_cpu(hdr->frame_control);
 	sn = IEEE80211_SEQ_TO_SN(__le16_to_cpu(hdr->seq_ctrl));

 	if (ieee80211_is_beacon(hdr->frame_control)) {
 		wcn36xx_dbg(WCN36XX_DBG_BEACON, "beacon skb %p len %d fc %04x sn %d\n",
 			    skb, skb->len, fc, sn);
 		wcn36xx_dbg_dump(WCN36XX_DBG_BEACON_DUMP, "SKB <<< ",
 				 (char *)skb->data, skb->len);
 	} else {
 		wcn36xx_dbg(WCN36XX_DBG_RX, "rx skb %p len %d fc %04x sn %d\n",
 			    skb, skb->len, fc, sn);
 		wcn36xx_dbg_dump(WCN36XX_DBG_RX_DUMP, "SKB <<< ",
 				 (char *)skb->data, skb->len);
 	}

 	ieee80211_rx_irqsafe(wcn->hw, skb);

 	return 0;
 }

 static void wcn36xx_set_tx_pdu(struct wcn36xx_tx_bd *bd,
 			       u32 mpdu_header_len,
 			       u32 len,
 			       u16 tid)
 {
 	bd->pdu.mpdu_header_len = mpdu_header_len;
 	bd->pdu.mpdu_header_off = sizeof(*bd);
 	bd->pdu.mpdu_data_off = bd->pdu.mpdu_header_len +
 		bd->pdu.mpdu_header_off;
 	bd->pdu.mpdu_len = len;
 	bd->pdu.tid = tid;
 	bd->pdu.bd_ssn = WCN36XX_TXBD_SSN_FILL_DPU_QOS;
 }

 static inline struct wcn36xx_vif *get_vif_by_addr(struct wcn36xx *wcn,
 						  u8 *addr)
 {
 	struct wcn36xx_vif *vif_priv = NULL;
 	struct ieee80211_vif *vif = NULL;
 	list_for_each_entry(vif_priv, &wcn->vif_list, list) {
 			vif = container_of((void *)vif_priv,
 				   struct ieee80211_vif,
 				   drv_priv);
 			if (memcmp(vif->addr, addr, ETH_ALEN) == 0)
 				return vif_priv;
 	}
 	wcn36xx_warn("vif %pM not found\n", addr);
 	return NULL;
 }

 static void wcn36xx_tx_start_ampdu(struct wcn36xx *wcn,
 				   struct wcn36xx_sta *sta_priv,
 				   struct sk_buff *skb)
 {
 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 	struct ieee80211_sta *sta;
 	u8 *qc, tid;

 	if (!conf_is_ht(&wcn->hw->conf))
 		return;

 	sta = wcn36xx_priv_to_sta(sta_priv);

 	if (WARN_ON(!ieee80211_is_data_qos(hdr->frame_control)))
 		return;

 	if (skb_get_queue_mapping(skb) == IEEE80211_AC_VO)
 		return;

 	qc = ieee80211_get_qos_ctl(hdr);
 	tid = qc[0] & IEEE80211_QOS_CTL_TID_MASK;

 	spin_lock(&sta_priv->ampdu_lock);
 	if (sta_priv->ampdu_state[tid] != WCN36XX_AMPDU_NONE)
 		goto out_unlock;

 	if (sta_priv->non_agg_frame_ct++ >= WCN36XX_AMPDU_START_THRESH) {
 		sta_priv->ampdu_state[tid] = WCN36XX_AMPDU_START;
 		sta_priv->non_agg_frame_ct = 0;
 		ieee80211_start_tx_ba_session(sta, tid, 0);
 	}
 out_unlock:
 	spin_unlock(&sta_priv->ampdu_lock);
 }

 static void wcn36xx_set_tx_data(struct wcn36xx_tx_bd *bd,
 				struct wcn36xx *wcn,
 				struct wcn36xx_vif **vif_priv,
 				struct wcn36xx_sta *sta_priv,
 				struct sk_buff *skb,
 				bool bcast)
 {
 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 	struct ieee80211_vif *vif = NULL;
 	struct wcn36xx_vif *__vif_priv = NULL;
 	bool is_data_qos;

 	bd->bd_rate = WCN36XX_BD_RATE_DATA;

 	/*
 	 * For not unicast frames mac80211 will not set sta pointer so use
 	 * self_sta_index instead.
 	 */
 	if (sta_priv) {
 		__vif_priv = sta_priv->vif;
 		vif = container_of((void *)__vif_priv,
 				   struct ieee80211_vif,
 				   drv_priv);

 		bd->dpu_sign = sta_priv->ucast_dpu_sign;
 		if (vif->type == NL80211_IFTYPE_STATION) {
 			bd->sta_index = sta_priv->bss_sta_index;
 			bd->dpu_desc_idx = sta_priv->bss_dpu_desc_index;
 		} else if (vif->type == NL80211_IFTYPE_AP ||
 			   vif->type == NL80211_IFTYPE_ADHOC ||
 			   vif->type == NL80211_IFTYPE_MESH_POINT) {
 			bd->sta_index = sta_priv->sta_index;
 			bd->dpu_desc_idx = sta_priv->dpu_desc_index;
 		}
 	} else {
 		__vif_priv = get_vif_by_addr(wcn, hdr->addr2);
 		bd->sta_index = __vif_priv->self_sta_index;
 		bd->dpu_desc_idx = __vif_priv->self_dpu_desc_index;
 		bd->dpu_sign = __vif_priv->self_ucast_dpu_sign;
 	}

 	if (ieee80211_is_nullfunc(hdr->frame_control) ||
 	   (sta_priv && !sta_priv->is_data_encrypted))
 		bd->dpu_ne = 1;

 	if (bcast) {
 		bd->ub = 1;
 		bd->ack_policy = 1;
 	}
 	*vif_priv = __vif_priv;

 	is_data_qos = ieee80211_is_data_qos(hdr->frame_control);

 	wcn36xx_set_tx_pdu(bd,
 			   is_data_qos ?
 			   sizeof(struct ieee80211_qos_hdr) :
 			   sizeof(struct ieee80211_hdr_3addr),
 			   skb->len, sta_priv ? sta_priv->tid : 0);

 	if (sta_priv && is_data_qos)
 		wcn36xx_tx_start_ampdu(wcn, sta_priv, skb);
 }

 static void wcn36xx_set_tx_mgmt(struct wcn36xx_tx_bd *bd,
 				struct wcn36xx *wcn,
 				struct wcn36xx_vif **vif_priv,
 				struct sk_buff *skb,
 				bool bcast)
 {
 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 	struct wcn36xx_vif *__vif_priv =
 		get_vif_by_addr(wcn, hdr->addr2);
 	bd->sta_index = __vif_priv->self_sta_index;
 	bd->dpu_desc_idx = __vif_priv->self_dpu_desc_index;
 	bd->dpu_ne = 1;

 	/* default rate for unicast */
 	if (ieee80211_is_mgmt(hdr->frame_control))
 		bd->bd_rate = (WCN36XX_BAND(wcn) == IEEE80211_BAND_5GHZ) ?
 			WCN36XX_BD_RATE_CTRL :
 			WCN36XX_BD_RATE_MGMT;
 	else if (ieee80211_is_ctl(hdr->frame_control))
 		bd->bd_rate = WCN36XX_BD_RATE_CTRL;
 	else
 		wcn36xx_warn("frame control type unknown\n");

 	/*
 	 * In joining state trick hardware that probe is sent as
 	 * unicast even if address is broadcast.
 	 */
 	if (__vif_priv->is_joining &&
 	    ieee80211_is_probe_req(hdr->frame_control))
 		bcast = false;

 	if (bcast) {
 		/* broadcast */
 		bd->ub = 1;
 		/* No ack needed not unicast */
 		bd->ack_policy = 1;
 		bd->queue_id = WCN36XX_TX_B_WQ_ID;
 	} else
 		bd->queue_id = WCN36XX_TX_U_WQ_ID;
 	*vif_priv = __vif_priv;

 	wcn36xx_set_tx_pdu(bd,
 			   ieee80211_is_data_qos(hdr->frame_control) ?
 			   sizeof(struct ieee80211_qos_hdr) :
 			   sizeof(struct ieee80211_hdr_3addr),
 			   skb->len, WCN36XX_TID);
 }

 int wcn36xx_start_tx(struct wcn36xx *wcn,
 		     struct wcn36xx_sta *sta_priv,
 		     struct sk_buff *skb)
 {
 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 	struct wcn36xx_vif *vif_priv = NULL;
 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 	unsigned long flags;
 	bool is_low = ieee80211_is_data(hdr->frame_control);
 	bool bcast = is_broadcast_ether_addr(hdr->addr1) ||
 		is_multicast_ether_addr(hdr->addr1);
 	struct wcn36xx_tx_bd *bd = wcn36xx_dxe_get_next_bd(wcn, is_low);

 	if (!bd) {
 		/*
 		 * TX DXE are used in pairs. One for the BD and one for the
 		 * actual frame. The BD DXE's has a preallocated buffer while
 		 * the skb ones does not. If this isn't true something is really
 		 * wierd. TODO: Recover from this situation
 		 */

 		wcn36xx_err("bd address may not be NULL for BD DXE\n");
 		return -EINVAL;
 	}

 	memset(bd, 0, sizeof(*bd));

 	wcn36xx_dbg(WCN36XX_DBG_TX,
 		    "tx skb %p len %d fc %04x sn %d %s %s\n",
 		    skb, skb->len, __le16_to_cpu(hdr->frame_control),
 		    IEEE80211_SEQ_TO_SN(__le16_to_cpu(hdr->seq_ctrl)),
 		    is_low ? "low" : "high", bcast ? "bcast" : "ucast");

 	wcn36xx_dbg_dump(WCN36XX_DBG_TX_DUMP, "", skb->data, skb->len);

 	bd->dpu_rf = WCN36XX_BMU_WQ_TX;

 	bd->tx_comp = !!(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS);
 	if (bd->tx_comp) {
 		wcn36xx_dbg(WCN36XX_DBG_DXE, "TX_ACK status requested\n");
 		spin_lock_irqsave(&wcn->dxe_lock, flags);
 		if (wcn->tx_ack_skb) {
 			spin_unlock_irqrestore(&wcn->dxe_lock, flags);
 			wcn36xx_warn("tx_ack_skb already set\n");
 			return -EINVAL;
 		}

 		wcn->tx_ack_skb = skb;
 		spin_unlock_irqrestore(&wcn->dxe_lock, flags);

 		/* Only one at a time is supported by fw. Stop the TX queues
 		 * until the ack status gets back.
 		 *
 		 * TODO: Add watchdog in case FW does not answer
 		 */
 		ieee80211_stop_queues(wcn->hw);
 	}

 	/* Data frames served first*/
 	if (is_low)
 		wcn36xx_set_tx_data(bd, wcn, &vif_priv, sta_priv, skb, bcast);
 	else
 		/* MGMT and CTRL frames are handeld here*/
 		wcn36xx_set_tx_mgmt(bd, wcn, &vif_priv, skb, bcast);

 	buff_to_be((u32 *)bd, sizeof(*bd)/sizeof(u32));
 	bd->tx_bd_sign = 0xbdbdbdbd;

 	return wcn36xx_dxe_tx_frame(wcn, vif_priv, skb, is_low);
 }
	/*
	* Copyright (c) 2013 Eugene Krasnikov <k.eugene.e@gmail.com>
	*
	* Permission to use, copy, modify, and/or distribute this software for any
	* purpose with or without fee is hereby granted, provided that the above
	* copyright notice and this permission notice appear in all copies.
	*
	* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
	* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
	* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
	* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
	* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
	* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
	* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
	*/

	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

	#include "txrx.h"

	static inline int get_rssi0(struct wcn36xx_rx_bd *bd)
	{
	return 100 - ((bd->phy_stat0 >> 24) & 0xff);
	}

	int wcn36xx_rx_skb(struct wcn36xx wcn, struct sk_buff skb)
	{
	struct ieee80211_rx_status status;
	struct ieee80211_hdr *hdr;
	struct wcn36xx_rx_bd *bd;
	u16 fc, sn;

	/*
	* All fields must be 0, otherwise it can lead to
	* unexpected consequences.
	*/
	memset(&status, 0, sizeof(status));

	bd = (struct wcn36xx_rx_bd *)skb->data;
	buff_to_be((u32 )bd, sizeof(bd)/sizeof(u32));
	wcn36xx_dbg_dump(WCN36XX_DBG_RX_DUMP,
	"BD <<< ", (char *)bd,
	sizeof(struct wcn36xx_rx_bd));

	skb_put(skb, bd->pdu.mpdu_header_off + bd->pdu.mpdu_len);
	skb_pull(skb, bd->pdu.mpdu_header_off);

	status.mactime = 10;
	status.freq = WCN36XX_CENTER_FREQ(wcn);
	status.band = WCN36XX_BAND(wcn);
	status.signal = -get_rssi0(bd);
	status.antenna = 1;
	status.rate_idx = 1;
	status.flag = 0;
	status.rx_flags = 0;
	status.flag \|= RX_FLAG_IV_STRIPPED \|
	RX_FLAG_MMIC_STRIPPED \|
	RX_FLAG_DECRYPTED;

	wcn36xx_dbg(WCN36XX_DBG_RX, "status.flags=%x\n", status.flag);

	memcpy(IEEE80211_SKB_RXCB(skb), &status, sizeof(status));

	hdr = (struct ieee80211_hdr *) skb->data;
	fc = __le16_to_cpu(hdr->frame_control);
	sn = IEEE80211_SEQ_TO_SN(__le16_to_cpu(hdr->seq_ctrl));

	if (ieee80211_is_beacon(hdr->frame_control)) {
	wcn36xx_dbg(WCN36XX_DBG_BEACON, "beacon skb %p len %d fc %04x sn %d\n",
	skb, skb->len, fc, sn);
	wcn36xx_dbg_dump(WCN36XX_DBG_BEACON_DUMP, "SKB <<< ",
	(char *)skb->data, skb->len);
	} else {
	wcn36xx_dbg(WCN36XX_DBG_RX, "rx skb %p len %d fc %04x sn %d\n",
	skb, skb->len, fc, sn);
	wcn36xx_dbg_dump(WCN36XX_DBG_RX_DUMP, "SKB <<< ",
	(char *)skb->data, skb->len);
	}

	ieee80211_rx_irqsafe(wcn->hw, skb);

	return 0;
	}

	static void wcn36xx_set_tx_pdu(struct wcn36xx_tx_bd *bd,
	u32 mpdu_header_len,
	u32 len,
	u16 tid)
	{
	bd->pdu.mpdu_header_len = mpdu_header_len;
	bd->pdu.mpdu_header_off = sizeof(*bd);
	bd->pdu.mpdu_data_off = bd->pdu.mpdu_header_len +
	bd->pdu.mpdu_header_off;
	bd->pdu.mpdu_len = len;
	bd->pdu.tid = tid;
	bd->pdu.bd_ssn = WCN36XX_TXBD_SSN_FILL_DPU_QOS;
	}

	static inline struct wcn36xx_vif get_vif_by_addr(struct wcn36xx wcn,
	u8 *addr)
	{
	struct wcn36xx_vif *vif_priv = NULL;
	struct ieee80211_vif *vif = NULL;
	list_for_each_entry(vif_priv, &wcn->vif_list, list) {
	vif = container_of((void *)vif_priv,
	struct ieee80211_vif,
	drv_priv);
	if (memcmp(vif->addr, addr, ETH_ALEN) == 0)
	return vif_priv;
	}
	wcn36xx_warn("vif %pM not found\n", addr);
	return NULL;
	}

	static void wcn36xx_tx_start_ampdu(struct wcn36xx *wcn,
	struct wcn36xx_sta *sta_priv,
	struct sk_buff *skb)
	{
	struct ieee80211_hdr hdr = (struct ieee80211_hdr )skb->data;
	struct ieee80211_sta *sta;
	u8 *qc, tid;

	if (!conf_is_ht(&wcn->hw->conf))
	return;

	sta = wcn36xx_priv_to_sta(sta_priv);

	if (WARN_ON(!ieee80211_is_data_qos(hdr->frame_control)))
	return;

	if (skb_get_queue_mapping(skb) == IEEE80211_AC_VO)
	return;

	qc = ieee80211_get_qos_ctl(hdr);
	tid = qc[0] & IEEE80211_QOS_CTL_TID_MASK;

	spin_lock(&sta_priv->ampdu_lock);
	if (sta_priv->ampdu_state[tid] != WCN36XX_AMPDU_NONE)
	goto out_unlock;

	if (sta_priv->non_agg_frame_ct++ >= WCN36XX_AMPDU_START_THRESH) {
	sta_priv->ampdu_state[tid] = WCN36XX_AMPDU_START;
	sta_priv->non_agg_frame_ct = 0;
	ieee80211_start_tx_ba_session(sta, tid, 0);
	}
	out_unlock:
	spin_unlock(&sta_priv->ampdu_lock);
	}

	static void wcn36xx_set_tx_data(struct wcn36xx_tx_bd *bd,
	struct wcn36xx *wcn,
	struct wcn36xx_vif **vif_priv,
	struct wcn36xx_sta *sta_priv,
	struct sk_buff *skb,
	bool bcast)
	{
	struct ieee80211_hdr hdr = (struct ieee80211_hdr )skb->data;
	struct ieee80211_vif *vif = NULL;
	struct wcn36xx_vif *__vif_priv = NULL;
	bool is_data_qos;

	bd->bd_rate = WCN36XX_BD_RATE_DATA;

	/*
	* For not unicast frames mac80211 will not set sta pointer so use
	* self_sta_index instead.
	*/
	if (sta_priv) {
	__vif_priv = sta_priv->vif;
	vif = container_of((void *)__vif_priv,
	struct ieee80211_vif,
	drv_priv);

	bd->dpu_sign = sta_priv->ucast_dpu_sign;
	if (vif->type == NL80211_IFTYPE_STATION) {
	bd->sta_index = sta_priv->bss_sta_index;
	bd->dpu_desc_idx = sta_priv->bss_dpu_desc_index;
	} else if (vif->type == NL80211_IFTYPE_AP \|\|
	vif->type == NL80211_IFTYPE_ADHOC \|\|
	vif->type == NL80211_IFTYPE_MESH_POINT) {
	bd->sta_index = sta_priv->sta_index;
	bd->dpu_desc_idx = sta_priv->dpu_desc_index;
	}
	} else {
	__vif_priv = get_vif_by_addr(wcn, hdr->addr2);
	bd->sta_index = __vif_priv->self_sta_index;
	bd->dpu_desc_idx = __vif_priv->self_dpu_desc_index;
	bd->dpu_sign = __vif_priv->self_ucast_dpu_sign;
	}

	if (ieee80211_is_nullfunc(hdr->frame_control) \|\|
	(sta_priv && !sta_priv->is_data_encrypted))
	bd->dpu_ne = 1;

	if (bcast) {
	bd->ub = 1;
	bd->ack_policy = 1;
	}
	*vif_priv = __vif_priv;

	is_data_qos = ieee80211_is_data_qos(hdr->frame_control);

	wcn36xx_set_tx_pdu(bd,
	is_data_qos ?
	sizeof(struct ieee80211_qos_hdr) :
	sizeof(struct ieee80211_hdr_3addr),
	skb->len, sta_priv ? sta_priv->tid : 0);

	if (sta_priv && is_data_qos)
	wcn36xx_tx_start_ampdu(wcn, sta_priv, skb);
	}

	static void wcn36xx_set_tx_mgmt(struct wcn36xx_tx_bd *bd,
	struct wcn36xx *wcn,
	struct wcn36xx_vif **vif_priv,
	struct sk_buff *skb,
	bool bcast)
	{
	struct ieee80211_hdr hdr = (struct ieee80211_hdr )skb->data;
	struct wcn36xx_vif *__vif_priv =
	get_vif_by_addr(wcn, hdr->addr2);
	bd->sta_index = __vif_priv->self_sta_index;
	bd->dpu_desc_idx = __vif_priv->self_dpu_desc_index;
	bd->dpu_ne = 1;

	/* default rate for unicast */
	if (ieee80211_is_mgmt(hdr->frame_control))
	bd->bd_rate = (WCN36XX_BAND(wcn) == IEEE80211_BAND_5GHZ) ?
	WCN36XX_BD_RATE_CTRL :
	WCN36XX_BD_RATE_MGMT;
	else if (ieee80211_is_ctl(hdr->frame_control))
	bd->bd_rate = WCN36XX_BD_RATE_CTRL;
	else
	wcn36xx_warn("frame control type unknown\n");

	/*
	* In joining state trick hardware that probe is sent as
	* unicast even if address is broadcast.
	*/
	if (__vif_priv->is_joining &&
	ieee80211_is_probe_req(hdr->frame_control))
	bcast = false;

	if (bcast) {
	/* broadcast */
	bd->ub = 1;
	/* No ack needed not unicast */
	bd->ack_policy = 1;
	bd->queue_id = WCN36XX_TX_B_WQ_ID;
	} else
	bd->queue_id = WCN36XX_TX_U_WQ_ID;
	*vif_priv = __vif_priv;

	wcn36xx_set_tx_pdu(bd,
	ieee80211_is_data_qos(hdr->frame_control) ?
	sizeof(struct ieee80211_qos_hdr) :
	sizeof(struct ieee80211_hdr_3addr),
	skb->len, WCN36XX_TID);
	}

	int wcn36xx_start_tx(struct wcn36xx *wcn,
	struct wcn36xx_sta *sta_priv,
	struct sk_buff *skb)
	{
	struct ieee80211_hdr hdr = (struct ieee80211_hdr )skb->data;
	struct wcn36xx_vif *vif_priv = NULL;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	unsigned long flags;
	bool is_low = ieee80211_is_data(hdr->frame_control);
	bool bcast = is_broadcast_ether_addr(hdr->addr1) \|\|
	is_multicast_ether_addr(hdr->addr1);
	struct wcn36xx_tx_bd *bd = wcn36xx_dxe_get_next_bd(wcn, is_low);

	if (!bd) {
	/*
	* TX DXE are used in pairs. One for the BD and one for the
	* actual frame. The BD DXE's has a preallocated buffer while
	* the skb ones does not. If this isn't true something is really
	* wierd. TODO: Recover from this situation
	*/

	wcn36xx_err("bd address may not be NULL for BD DXE\n");
	return -EINVAL;
	}

	memset(bd, 0, sizeof(*bd));

	wcn36xx_dbg(WCN36XX_DBG_TX,
	"tx skb %p len %d fc %04x sn %d %s %s\n",
	skb, skb->len, __le16_to_cpu(hdr->frame_control),
	IEEE80211_SEQ_TO_SN(__le16_to_cpu(hdr->seq_ctrl)),
	is_low ? "low" : "high", bcast ? "bcast" : "ucast");

	wcn36xx_dbg_dump(WCN36XX_DBG_TX_DUMP, "", skb->data, skb->len);

	bd->dpu_rf = WCN36XX_BMU_WQ_TX;

	bd->tx_comp = !!(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS);
	if (bd->tx_comp) {
	wcn36xx_dbg(WCN36XX_DBG_DXE, "TX_ACK status requested\n");
	spin_lock_irqsave(&wcn->dxe_lock, flags);
	if (wcn->tx_ack_skb) {
	spin_unlock_irqrestore(&wcn->dxe_lock, flags);
	wcn36xx_warn("tx_ack_skb already set\n");
	return -EINVAL;
	}

	wcn->tx_ack_skb = skb;
	spin_unlock_irqrestore(&wcn->dxe_lock, flags);

	/* Only one at a time is supported by fw. Stop the TX queues
	* until the ack status gets back.
	*
	* TODO: Add watchdog in case FW does not answer
	*/
	ieee80211_stop_queues(wcn->hw);
	}

	/* Data frames served first*/
	if (is_low)
	wcn36xx_set_tx_data(bd, wcn, &vif_priv, sta_priv, skb, bcast);
	else
	/* MGMT and CTRL frames are handeld here*/
	wcn36xx_set_tx_mgmt(bd, wcn, &vif_priv, skb, bcast);

	buff_to_be((u32 )bd, sizeof(bd)/sizeof(u32));
	bd->tx_bd_sign = 0xbdbdbdbd;

	return wcn36xx_dxe_tx_frame(wcn, vif_priv, skb, is_low);
	}