ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
		     struct ieee80211_tx_data *tx,
		     struct sk_buff *skb)
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_hdr *hdr;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	int tid;
	u8 *qc;

	memset(tx, 0, sizeof(*tx));
	tx->skb = skb;
	tx->local = local;
	tx->sdata = sdata;
	__skb_queue_head_init(&tx->skbs);

	/*
	 * If this flag is set to true anywhere, and we get here,
	 * we are doing the needed processing, so remove the flag
	 * now.
	 */
	info->flags &= ~IEEE80211_TX_INTFL_NEED_TXPROCESSING;

	hdr = (struct ieee80211_hdr *) skb->data;

	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
		tx->sta = rcu_dereference(sdata->u.vlan.sta);
		if (!tx->sta && sdata->dev->ieee80211_ptr->use_4addr)
			return TX_DROP;
	} else if (info->flags & (IEEE80211_TX_CTL_INJECTED |
				  IEEE80211_TX_INTFL_NL80211_FRAME_TX) ||
		   tx->sdata->control_port_protocol == tx->skb->protocol) {
		tx->sta = sta_info_get_bss(sdata, hdr->addr1);
	}
	if (!tx->sta)
		tx->sta = sta_info_get(sdata, hdr->addr1);

	if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
	    !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
	    (local->hw.flags & IEEE80211_HW_AMPDU_AGGREGATION) &&
	    !(local->hw.flags & IEEE80211_HW_TX_AMPDU_SETUP_IN_HW)) {
		struct tid_ampdu_tx *tid_tx;

		qc = ieee80211_get_qos_ctl(hdr);
		tid = *qc & IEEE80211_QOS_CTL_TID_MASK;

		tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
		if (tid_tx) {
			bool queued;

			queued = ieee80211_tx_prep_agg(tx, skb, info,
						       tid_tx, tid);

			if (unlikely(queued))
				return TX_QUEUED;
		}
	}

	if (is_multicast_ether_addr(hdr->addr1)) {
		tx->flags &= ~IEEE80211_TX_UNICAST;
		info->flags |= IEEE80211_TX_CTL_NO_ACK;
	} else
		tx->flags |= IEEE80211_TX_UNICAST;

	if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
		if (!(tx->flags & IEEE80211_TX_UNICAST) ||
		    skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
		    info->flags & IEEE80211_TX_CTL_AMPDU)
			info->flags |= IEEE80211_TX_CTL_DONTFRAG;
	}

	if (!tx->sta)
		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
	else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT))
		info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;

	info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;

	return TX_CONTINUE;
}

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