text: /******************************************************************************
   *
   * GPL LICENSE SUMMARY
   *
   * Copyright(c) 2008 - 2014 Intel Corporation. All rights reserved.
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of version 2 of the GNU General Public License as
   * published by the Free Software Foundation.
   *
   * This program is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
   * USA
   *
   * The full GNU General Public License is included in this distribution
   * in the file called COPYING.
   *
   * Contact Information:
   *  Intel Linux Wireless <ilw@linux.intel.com>
   * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
   *
   *****************************************************************************/
  
  #include <linux/kernel.h>
  #include <linux/module.h>
  #include <linux/sched.h>
  #include <linux/ieee80211.h>
  #include "iwl-io.h"
  #include "iwl-trans.h"
  #include "iwl-agn-hw.h"
  #include "dev.h"
  #include "agn.h"
  
  static const u8 tid_to_ac[] = {
  	IEEE80211_AC_BE,
  	IEEE80211_AC_BK,
  	IEEE80211_AC_BK,
  	IEEE80211_AC_BE,
  	IEEE80211_AC_VI,
  	IEEE80211_AC_VI,
  	IEEE80211_AC_VO,
  	IEEE80211_AC_VO,
  };
  
  static void iwlagn_tx_cmd_protection(struct iwl_priv *priv,
  				     struct ieee80211_tx_info *info,
  				     __le16 fc, __le32 *tx_flags)
  {
  	if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS ||
  	    info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT ||
  	    info->flags & IEEE80211_TX_CTL_AMPDU)
  		*tx_flags |= TX_CMD_FLG_PROT_REQUIRE_MSK;
  }
  
  /*
   * handle build REPLY_TX command notification.
   */
  static void iwlagn_tx_cmd_build_basic(struct iwl_priv *priv,
  				      struct sk_buff *skb,
  				      struct iwl_tx_cmd *tx_cmd,
  				      struct ieee80211_tx_info *info,
  				      struct ieee80211_hdr *hdr, u8 sta_id)
  {
  	__le16 fc = hdr->frame_control;
  	__le32 tx_flags = tx_cmd->tx_flags;
  
  	tx_cmd->stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
  
  	if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
  		tx_flags |= TX_CMD_FLG_ACK_MSK;
  	else
  		tx_flags &= ~TX_CMD_FLG_ACK_MSK;
  
  	if (ieee80211_is_probe_resp(fc))
  		tx_flags |= TX_CMD_FLG_TSF_MSK;
  	else if (ieee80211_is_back_req(fc))
  		tx_flags |= TX_CMD_FLG_ACK_MSK | TX_CMD_FLG_IMM_BA_RSP_MASK;
  	else if (info->band == IEEE80211_BAND_2GHZ &&
  		 priv->lib->bt_params &&
  		 priv->lib->bt_params->advanced_bt_coexist &&
  		 (ieee80211_is_auth(fc) || ieee80211_is_assoc_req(fc) ||
  		 ieee80211_is_reassoc_req(fc) ||
  		 info->control.flags & IEEE80211_TX_CTRL_PORT_CTRL_PROTO))
  		tx_flags |= TX_CMD_FLG_IGNORE_BT;
  
  
  	tx_cmd->sta_id = sta_id;
  	if (ieee80211_has_morefrags(fc))
  		tx_flags |= TX_CMD_FLG_MORE_FRAG_MSK;
  
  	if (ieee80211_is_data_qos(fc)) {
  		u8 *qc = ieee80211_get_qos_ctl(hdr);
  		tx_cmd->tid_tspec = qc[0] & 0xf;
  		tx_flags &= ~TX_CMD_FLG_SEQ_CTL_MSK;
  	} else {
  		tx_cmd->tid_tspec = IWL_TID_NON_QOS;
  		if (info->flags & IEEE80211_TX_CTL_ASSIGN_SEQ)
  			tx_flags |= TX_CMD_FLG_SEQ_CTL_MSK;
  		else
  			tx_flags &= ~TX_CMD_FLG_SEQ_CTL_MSK;
  	}
  
  	iwlagn_tx_cmd_protection(priv, info, fc, &tx_flags);
  
  	tx_flags &= ~(TX_CMD_FLG_ANT_SEL_MSK);
  	if (ieee80211_is_mgmt(fc)) {
  		if (ieee80211_is_assoc_req(fc) || ieee80211_is_reassoc_req(fc))
  			tx_cmd->timeout.pm_frame_timeout = cpu_to_le16(3);
  		else
  			tx_cmd->timeout.pm_frame_timeout = cpu_to_le16(2);
  	} else {
  		tx_cmd->timeout.pm_frame_timeout = 0;
  	}
  
  	tx_cmd->driver_txop = 0;
  	tx_cmd->tx_flags = tx_flags;
  	tx_cmd->next_frame_len = 0;
  }
  
  static void iwlagn_tx_cmd_build_rate(struct iwl_priv *priv,
  				     struct iwl_tx_cmd *tx_cmd,
  				     struct ieee80211_tx_info *info,
  				     struct ieee80211_sta *sta,
  				     __le16 fc)
  {
  	u32 rate_flags;
  	int rate_idx;
  	u8 rts_retry_limit;
  	u8 data_retry_limit;
  	u8 rate_plcp;
  
  	if (priv->wowlan) {
  		rts_retry_limit = IWLAGN_LOW_RETRY_LIMIT;
  		data_retry_limit = IWLAGN_LOW_RETRY_LIMIT;
  	} else {
  		/* Set retry limit on RTS packets */
  		rts_retry_limit = IWLAGN_RTS_DFAULT_RETRY_LIMIT;
  
  		/* Set retry limit on DATA packets and Probe Responses*/
  		if (ieee80211_is_probe_resp(fc)) {
  			data_retry_limit = IWLAGN_MGMT_DFAULT_RETRY_LIMIT;
  			rts_retry_limit =
  				min(data_retry_limit, rts_retry_limit);
  		} else if (ieee80211_is_back_req(fc))
  			data_retry_limit = IWLAGN_BAR_DFAULT_RETRY_LIMIT;
  		else
  			data_retry_limit = IWLAGN_DEFAULT_TX_RETRY;
  	}
  
  	tx_cmd->data_retry_limit = data_retry_limit;
  	tx_cmd->rts_retry_limit = rts_retry_limit;
  
  	/* DATA packets will use the uCode station table for rate/antenna
  	 * selection */
  	if (ieee80211_is_data(fc)) {
  		tx_cmd->initial_rate_index = 0;
  		tx_cmd->tx_flags |= TX_CMD_FLG_STA_RATE_MSK;
  		return;
  	} else if (ieee80211_is_back_req(fc))
  		tx_cmd->tx_flags |= TX_CMD_FLG_STA_RATE_MSK;
  
  	/**
  	 * If the current TX rate stored in mac80211 has the MCS bit set, it's
  	 * not really a TX rate.  Thus, we use the lowest supported rate for
  	 * this band.  Also use the lowest supported rate if the stored rate
  	 * index is invalid.
  	 */
  	rate_idx = info->control.rates[0].idx;
  	if (info->control.rates[0].flags & IEEE80211_TX_RC_MCS ||
  			(rate_idx < 0) || (rate_idx > IWL_RATE_COUNT_LEGACY))
  		rate_idx = rate_lowest_index(
  				&priv->nvm_data->bands[info->band], sta);
  	/* For 5 GHZ band, remap mac80211 rate indices into driver indices */
  	if (info->band == IEEE80211_BAND_5GHZ)
  		rate_idx += IWL_FIRST_OFDM_RATE;
  	/* Get PLCP rate for tx_cmd->rate_n_flags */
  	rate_plcp = iwl_rates[rate_idx].plcp;
  	/* Zero out flags for this packet */
  	rate_flags = 0;
  
  	/* Set CCK flag as needed */
  	if ((rate_idx >= IWL_FIRST_CCK_RATE) && (rate_idx <= IWL_LAST_CCK_RATE))
  		rate_flags |= RATE_MCS_CCK_MSK;
  
  	/* Set up antennas */
  	 if (priv->lib->bt_params &&
  	     priv->lib->bt_params->advanced_bt_coexist &&
  	     priv->bt_full_concurrent) {
  		/* operated as 1x1 in full concurrency mode */
  		priv->mgmt_tx_ant = iwl_toggle_tx_ant(priv, priv->mgmt_tx_ant,
  				first_antenna(priv->nvm_data->valid_tx_ant));
  	} else
  		priv->mgmt_tx_ant = iwl_toggle_tx_ant(
  					priv, priv->mgmt_tx_ant,
  					priv->nvm_data->valid_tx_ant);
  	rate_flags |= iwl_ant_idx_to_flags(priv->mgmt_tx_ant);
  
  	/* Set the rate in the TX cmd */
  	tx_cmd->rate_n_flags = iwl_hw_set_rate_n_flags(rate_plcp, rate_flags);
  }
  
  static void iwlagn_tx_cmd_build_hwcrypto(struct iwl_priv *priv,
  					 struct ieee80211_tx_info *info,
  					 struct iwl_tx_cmd *tx_cmd,
  					 struct sk_buff *skb_frag)
  {
  	struct ieee80211_key_conf *keyconf = info->control.hw_key;
  
  	switch (keyconf->cipher) {
  	case WLAN_CIPHER_SUITE_CCMP:
  		tx_cmd->sec_ctl = TX_CMD_SEC_CCM;
  		memcpy(tx_cmd->key, keyconf->key, keyconf->keylen);
  		if (info->flags & IEEE80211_TX_CTL_AMPDU)
  			tx_cmd->tx_flags |= TX_CMD_FLG_AGG_CCMP_MSK;
  		break;
  
  	case WLAN_CIPHER_SUITE_TKIP:
  		tx_cmd->sec_ctl = TX_CMD_SEC_TKIP;
  		ieee80211_get_tkip_p2k(keyconf, skb_frag, tx_cmd->key);
  		break;
  
  	case WLAN_CIPHER_SUITE_WEP104:
  		tx_cmd->sec_ctl |= TX_CMD_SEC_KEY128;
  		/* fall through */
  	case WLAN_CIPHER_SUITE_WEP40:
  		tx_cmd->sec_ctl |= (TX_CMD_SEC_WEP |
  			(keyconf->keyidx & TX_CMD_SEC_MSK) << TX_CMD_SEC_SHIFT);
  
  		memcpy(&tx_cmd->key[3], keyconf->key, keyconf->keylen);
  
  		IWL_DEBUG_TX(priv, "Configuring packet for WEP encryption "
  			     "with key %d\n", keyconf->keyidx);
  		break;
  
  	default:
  		IWL_ERR(priv, "Unknown encode cipher %x\n", keyconf->cipher);
  		break;
  	}
  }
  
  /**
   * iwl_sta_id_or_broadcast - return sta_id or broadcast sta
   * @context: the current context
   * @sta: mac80211 station
   *
   * In certain circumstances mac80211 passes a station pointer
   * that may be %NULL, for example during TX or key setup. In
   * that case, we need to use the broadcast station, so this
   * inline wraps that pattern.
   */
  static int iwl_sta_id_or_broadcast(struct iwl_rxon_context *context,
  				   struct ieee80211_sta *sta)
  {
  	int sta_id;
  
  	if (!sta)
  		return context->bcast_sta_id;
  
  	sta_id = iwl_sta_id(sta);
  
  	/*
  	 * mac80211 should not be passing a partially
  	 * initialised station!
  	 */
  	WARN_ON(sta_id == IWL_INVALID_STATION);
  
  	return sta_id;
  }
  
  /*
   * start REPLY_TX command process
   */
  int iwlagn_tx_skb(struct iwl_priv *priv,
  		  struct ieee80211_sta *sta,
  		  struct sk_buff *skb)
  {
  	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
  	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
  	struct iwl_station_priv *sta_priv = NULL;
  	struct iwl_rxon_context *ctx = &priv->contexts[IWL_RXON_CTX_BSS];
  	struct iwl_device_cmd *dev_cmd;
  	struct iwl_tx_cmd *tx_cmd;
  	__le16 fc;
  	u8 hdr_len;
  	u16 len, seq_number = 0;
  	u8 sta_id, tid = IWL_MAX_TID_COUNT;
  	bool is_agg = false, is_data_qos = false;
  	int txq_id;
  
  	if (info->control.vif)
  		ctx = iwl_rxon_ctx_from_vif(info->control.vif);
  
  	if (iwl_is_rfkill(priv)) {
  		IWL_DEBUG_DROP(priv, "Dropping - RF KILL\n");
  		goto drop_unlock_priv;
  	}
  
  	fc = hdr->frame_control;
  
  #ifdef CONFIG_IWLWIFI_DEBUG
  	if (ieee80211_is_auth(fc))
  		IWL_DEBUG_TX(priv, "Sending AUTH frame\n");
  	else if (ieee80211_is_assoc_req(fc))
  		IWL_DEBUG_TX(priv, "Sending ASSOC frame\n");
  	else if (ieee80211_is_reassoc_req(fc))
  		IWL_DEBUG_TX(priv, "Sending REASSOC frame\n");
  #endif
  
  	if (unlikely(ieee80211_is_probe_resp(fc))) {
  		struct iwl_wipan_noa_data *noa_data =
  			rcu_dereference(priv->noa_data);
  
  		if (noa_data &&
  		    pskb_expand_head(skb, 0, noa_data->length,
  				     GFP_ATOMIC) == 0) {
  			memcpy(skb_put(skb, noa_data->length),
  			       noa_data->data, noa_data->length);
  			hdr = (struct ieee80211_hdr *)skb->data;
  		}
  	}
  
  	hdr_len = ieee80211_hdrlen(fc);
  
  	/* For management frames use broadcast id to do not break aggregation */
  	if (!ieee80211_is_data(fc))
  		sta_id = ctx->bcast_sta_id;
  	else {
  		/* Find index into station table for destination station */
  		sta_id = iwl_sta_id_or_broadcast(ctx, sta);
  		if (sta_id == IWL_INVALID_STATION) {
  			IWL_DEBUG_DROP(priv, "Dropping - INVALID STATION: %pM\n",
  				       hdr->addr1);
  			goto drop_unlock_priv;
  		}
  	}
  
  	if (sta)
  		sta_priv = (void *)sta->drv_priv;
  
  	if (sta_priv && sta_priv->asleep &&
  	    (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER)) {
  		/*
  		 * This sends an asynchronous command to the device,
  		 * but we can rely on it being processed before the
  		 * next frame is processed -- and the next frame to
  		 * this station is the one that will consume this
  		 * counter.
  		 * For now set the counter to just 1 since we do not
  		 * support uAPSD yet.
  		 *
  		 * FIXME: If we get two non-bufferable frames one
  		 * after the other, we might only send out one of
  		 * them because this is racy.
  		 */
  		iwl_sta_modify_sleep_tx_count(priv, sta_id, 1);
  	}
  
  	dev_cmd = iwl_trans_alloc_tx_cmd(priv->trans);
  
  	if (unlikely(!dev_cmd))
  		goto drop_unlock_priv;
  
  	memset(dev_cmd, 0, sizeof(*dev_cmd));
  	dev_cmd->hdr.cmd = REPLY_TX;
  	tx_cmd = (struct iwl_tx_cmd *) dev_cmd->payload;
  
  	/* Total # bytes to be transmitted */
  	len = (u16)skb->len;
  	tx_cmd->len = cpu_to_le16(len);
  
  	if (info->control.hw_key)
  		iwlagn_tx_cmd_build_hwcrypto(priv, info, tx_cmd, skb);
  
  	/* TODO need this for burst mode later on */
  	iwlagn_tx_cmd_build_basic(priv, skb, tx_cmd, info, hdr, sta_id);
  
  	iwlagn_tx_cmd_build_rate(priv, tx_cmd, info, sta, fc);
  
  	memset(&info->status, 0, sizeof(info->status));
  
  	info->driver_data[0] = ctx;
  	info->driver_data[1] = dev_cmd;
  	/* From now on, we cannot access info->control */
  
  	spin_lock(&priv->sta_lock);
  
  	if (ieee80211_is_data_qos(fc) && !ieee80211_is_qos_nullfunc(fc)) {
  		u8 *qc = NULL;
  		struct iwl_tid_data *tid_data;
  		qc = ieee80211_get_qos_ctl(hdr);
  		tid = qc[0] & IEEE80211_QOS_CTL_TID_MASK;
  		if (WARN_ON_ONCE(tid >= IWL_MAX_TID_COUNT))
  			goto drop_unlock_sta;
  		tid_data = &priv->tid_data[sta_id][tid];
  
  		/* aggregation is on for this <sta,tid> */
  		if (info->flags & IEEE80211_TX_CTL_AMPDU &&
  		    tid_data->agg.state != IWL_AGG_ON) {
  			IWL_ERR(priv,
  				"TX_CTL_AMPDU while not in AGG: Tx flags = 0x%08x, agg.state = %d\n",
  				info->flags, tid_data->agg.state);
  			IWL_ERR(priv, "sta_id = %d, tid = %d seq_num = %d\n",
  				sta_id, tid,
  				IEEE80211_SEQ_TO_SN(tid_data->seq_number));
  			goto drop_unlock_sta;
  		}
  
  		/* We can receive packets from the stack in IWL_AGG_{ON,OFF}
  		 * only. Check this here.
  		 */
  		if (WARN_ONCE(tid_data->agg.state != IWL_AGG_ON &&
  			      tid_data->agg.state != IWL_AGG_OFF,
  			      "Tx while agg.state = %d\n", tid_data->agg.state))
  			goto drop_unlock_sta;
  
  		seq_number = tid_data->seq_number;
  		seq_number &= IEEE80211_SCTL_SEQ;
  		hdr->seq_ctrl &= cpu_to_le16(IEEE80211_SCTL_FRAG);
  		hdr->seq_ctrl |= cpu_to_le16(seq_number);
  		seq_number += 0x10;
  
  		if (info->flags & IEEE80211_TX_CTL_AMPDU)
  			is_agg = true;
  		is_data_qos = true;
  	}
  
  	/* Copy MAC header from skb into command buffer */
  	memcpy(tx_cmd->hdr, hdr, hdr_len);
  
  	txq_id = info->hw_queue;
  
  	if (is_agg)
  		txq_id = priv->tid_data[sta_id][tid].agg.txq_id;
  	else if (info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) {
  		/*
  		 * The microcode will clear the more data
  		 * bit in the last frame it transmits.
  		 */
  		hdr->frame_control |=
  			cpu_to_le16(IEEE80211_FCTL_MOREDATA);
  	}
  
  	WARN_ON_ONCE(is_agg &&
  		     priv->queue_to_mac80211[txq_id] != info->hw_queue);
  
  	IWL_DEBUG_TX(priv, "TX to [%d|%d] Q:%d - seq: 0x%x\n", sta_id, tid,
  		     txq_id, seq_number);
  
  	if (iwl_trans_tx(priv->trans, skb, dev_cmd, txq_id))
  		goto drop_unlock_sta;
  
  	if (is_data_qos && !ieee80211_has_morefrags(fc))
  		priv->tid_data[sta_id][tid].seq_number = seq_number;
  
  	spin_unlock(&priv->sta_lock);
  
  	/*
  	 * Avoid atomic ops if it isn't an associated client.
  	 * Also, if this is a packet for aggregation, don't
  	 * increase the counter because the ucode will stop
  	 * aggregation queues when their respective station
  	 * goes to sleep.
  	 */
  	if (sta_priv && sta_priv->client && !is_agg)
  		atomic_inc(&sta_priv->pending_frames);
  
  	return 0;
  
  drop_unlock_sta:
  	if (dev_cmd)
  		iwl_trans_free_tx_cmd(priv->trans, dev_cmd);
  	spin_unlock(&priv->sta_lock);
  drop_unlock_priv:
  	return -1;
  }
  
  static int iwlagn_alloc_agg_txq(struct iwl_priv *priv, int mq)
  {
  	int q;
  
  	for (q = IWLAGN_FIRST_AMPDU_QUEUE;
  	     q < priv->cfg->base_params->num_of_queues; q++) {
  		if (!test_and_set_bit(q, priv->agg_q_alloc)) {
  			priv->queue_to_mac80211[q] = mq;
  			return q;
  		}
  	}
  
  	return -ENOSPC;
  }
  
  static void iwlagn_dealloc_agg_txq(struct iwl_priv *priv, int q)
  {
  	clear_bit(q, priv->agg_q_alloc);
  	priv->queue_to_mac80211[q] = IWL_INVALID_MAC80211_QUEUE;
  }
  
  int iwlagn_tx_agg_stop(struct iwl_priv *priv, struct ieee80211_vif *vif,
  			struct ieee80211_sta *sta, u16 tid)
  {
  	struct iwl_tid_data *tid_data;
  	int sta_id, txq_id;
  	enum iwl_agg_state agg_state;
  
  	sta_id = iwl_sta_id(sta);
  
  	if (sta_id == IWL_INVALID_STATION) {
  		IWL_ERR(priv, "Invalid station for AGG tid %d\n", tid);
  		return -ENXIO;
  	}
  
  	spin_lock_bh(&priv->sta_lock);
  
  	tid_data = &priv->tid_data[sta_id][tid];
  	txq_id = tid_data->agg.txq_id;
  
  	switch (tid_data->agg.state) {
  	case IWL_EMPTYING_HW_QUEUE_ADDBA:
  		/*
  		* This can happen if the peer stops aggregation
  		* again before we've had a chance to drain the
  		* queue we selected previously, i.e. before the
  		* session was really started completely.
  		*/
  		IWL_DEBUG_HT(priv, "AGG stop before setup done\n");
  		goto turn_off;
  	case IWL_AGG_STARTING:
  		/*
  		 * This can happen when the session is stopped before
  		 * we receive ADDBA response
  		 */
  		IWL_DEBUG_HT(priv, "AGG stop before AGG became operational\n");
  		goto turn_off;
  	case IWL_AGG_ON:
  		break;
  	default:
  		IWL_WARN(priv,
  			 "Stopping AGG while state not ON or starting for %d on %d (%d)\n",
  			 sta_id, tid, tid_data->agg.state);
  		spin_unlock_bh(&priv->sta_lock);
  		return 0;
  	}
  
  	tid_data->agg.ssn = IEEE80211_SEQ_TO_SN(tid_data->seq_number);
  
  	/* There are still packets for this RA / TID in the HW */
  	if (!test_bit(txq_id, priv->agg_q_alloc)) {
  		IWL_DEBUG_TX_QUEUES(priv,
  			"stopping AGG on STA/TID %d/%d but hwq %d not used\n",
  			sta_id, tid, txq_id);
  	} else if (tid_data->agg.ssn != tid_data->next_reclaimed) {
  		IWL_DEBUG_TX_QUEUES(priv,
  				    "Can't proceed: ssn %d, next_recl = %d\n",
  				    tid_data->agg.ssn,
  				    tid_data->next_reclaimed);
  		tid_data->agg.state = IWL_EMPTYING_HW_QUEUE_DELBA;
  		spin_unlock_bh(&priv->sta_lock);
  		return 0;
  	}
  
  	IWL_DEBUG_TX_QUEUES(priv, "Can proceed: ssn = next_recl = %d\n",
  			    tid_data->agg.ssn);
  turn_off:
  	agg_state = tid_data->agg.state;
  	tid_data->agg.state = IWL_AGG_OFF;
  
  	spin_unlock_bh(&priv->sta_lock);
  
  	if (test_bit(txq_id, priv->agg_q_alloc)) {
  		/*
  		 * If the transport didn't know that we wanted to start
  		 * agreggation, don't tell it that we want to stop them.
  		 * This can happen when we don't get the addBA response on
  		 * time, or we hadn't time to drain the AC queues.
  		 */
  		if (agg_state == IWL_AGG_ON)
  			iwl_trans_txq_disable(priv->trans, txq_id, true);
  		else
  			IWL_DEBUG_TX_QUEUES(priv, "Don't disable tx agg: %d\n",
  					    agg_state);
  		iwlagn_dealloc_agg_txq(priv, txq_id);
  	}
  
  	ieee80211_stop_tx_ba_cb_irqsafe(vif, sta->addr, tid);
  
  	return 0;
  }
  
  int iwlagn_tx_agg_start(struct iwl_priv *priv, struct ieee80211_vif *vif,
  			struct ieee80211_sta *sta, u16 tid, u16 *ssn)
  {
  	struct iwl_rxon_context *ctx = iwl_rxon_ctx_from_vif(vif);
  	struct iwl_tid_data *tid_data;
  	int sta_id, txq_id, ret;
  
  	IWL_DEBUG_HT(priv, "TX AGG request on ra = %pM tid = %d\n",
  		     sta->addr, tid);
  
  	sta_id = iwl_sta_id(sta);
  	if (sta_id == IWL_INVALID_STATION) {
  		IWL_ERR(priv, "Start AGG on invalid station\n");
  		return -ENXIO;
  	}
  	if (unlikely(tid >= IWL_MAX_TID_COUNT))
  		return -EINVAL;
  
  	if (priv->tid_data[sta_id][tid].agg.state != IWL_AGG_OFF) {
  		IWL_ERR(priv, "Start AGG when state is not IWL_AGG_OFF !\n");
  		return -ENXIO;
  	}
  
  	txq_id = iwlagn_alloc_agg_txq(priv, ctx->ac_to_queue[tid_to_ac[tid]]);
  	if (txq_id < 0) {
  		IWL_DEBUG_TX_QUEUES(priv,
  			"No free aggregation queue for %pM/%d\n",
  			sta->addr, tid);
  		return txq_id;
  	}
  
  	ret = iwl_sta_tx_modify_enable_tid(priv, sta_id, tid);
  	if (ret)
  		return ret;
  
  	spin_lock_bh(&priv->sta_lock);
  	tid_data = &priv->tid_data[sta_id][tid];
  	tid_data->agg.ssn = IEEE80211_SEQ_TO_SN(tid_data->seq_number);
  	tid_data->agg.txq_id = txq_id;
  
  	*ssn = tid_data->agg.ssn;
  
  	if (*ssn == tid_data->next_reclaimed) {
  		IWL_DEBUG_TX_QUEUES(priv, "Can proceed: ssn = next_recl = %d\n",
  				    tid_data->agg.ssn);
  		tid_data->agg.state = IWL_AGG_STARTING;
  		ieee80211_start_tx_ba_cb_irqsafe(vif, sta->addr, tid);
  	} else {
  		IWL_DEBUG_TX_QUEUES(priv, "Can't proceed: ssn %d, "
  				    "next_reclaimed = %d\n",
  				    tid_data->agg.ssn,
  				    tid_data->next_reclaimed);
  		tid_data->agg.state = IWL_EMPTYING_HW_QUEUE_ADDBA;
  	}
  	spin_unlock_bh(&priv->sta_lock);
  
  	return ret;
  }
  
  int iwlagn_tx_agg_flush(struct iwl_priv *priv, struct ieee80211_vif *vif,
  			struct ieee80211_sta *sta, u16 tid)
  {
  	struct iwl_tid_data *tid_data;
  	enum iwl_agg_state agg_state;
  	int sta_id, txq_id;
  	sta_id = iwl_sta_id(sta);
  
  	/*
  	 * First set the agg state to OFF to avoid calling
  	 * ieee80211_stop_tx_ba_cb in iwlagn_check_ratid_empty.
  	 */
  	spin_lock_bh(&priv->sta_lock);
  
  	tid_data = &priv->tid_data[sta_id][tid];
  	txq_id = tid_data->agg.txq_id;
  	agg_state = tid_data->agg.state;
  	IWL_DEBUG_TX_QUEUES(priv, "Flush AGG: sta %d tid %d q %d state %d\n",
  			    sta_id, tid, txq_id, tid_data->agg.state);
  
  	tid_data->agg.state = IWL_AGG_OFF;
  
  	spin_unlock_bh(&priv->sta_lock);
  
  	if (iwlagn_txfifo_flush(priv, BIT(txq_id)))
  		IWL_ERR(priv, "Couldn't flush the AGG queue\n");
  
  	if (test_bit(txq_id, priv->agg_q_alloc)) {
  		/*
  		 * If the transport didn't know that we wanted to start
  		 * agreggation, don't tell it that we want to stop them.
  		 * This can happen when we don't get the addBA response on
  		 * time, or we hadn't time to drain the AC queues.
  		 */
  		if (agg_state == IWL_AGG_ON)
  			iwl_trans_txq_disable(priv->trans, txq_id, true);
  		else
  			IWL_DEBUG_TX_QUEUES(priv, "Don't disable tx agg: %d\n",
  					    agg_state);
  		iwlagn_dealloc_agg_txq(priv, txq_id);
  	}
  
  	return 0;
  }
  
  int iwlagn_tx_agg_oper(struct iwl_priv *priv, struct ieee80211_vif *vif,
  			struct ieee80211_sta *sta, u16 tid, u8 buf_size)
  {
  	struct iwl_station_priv *sta_priv = (void *) sta->drv_priv;
  	struct iwl_rxon_context *ctx = iwl_rxon_ctx_from_vif(vif);
  	int q, fifo;
  	u16 ssn;
  
  	buf_size = min_t(int, buf_size, LINK_QUAL_AGG_FRAME_LIMIT_DEF);
  
  	spin_lock_bh(&priv->sta_lock);
  	ssn = priv->tid_data[sta_priv->sta_id][tid].agg.ssn;
  	q = priv->tid_data[sta_priv->sta_id][tid].agg.txq_id;
  	priv->tid_data[sta_priv->sta_id][tid].agg.state = IWL_AGG_ON;
  	spin_unlock_bh(&priv->sta_lock);
  
  	fifo = ctx->ac_to_fifo[tid_to_ac[tid]];
  
  	iwl_trans_txq_enable(priv->trans, q, fifo, sta_priv->sta_id, tid,
  			     buf_size, ssn);
  
  	/*
  	 * If the limit is 0, then it wasn't initialised yet,
  	 * use the default. We can do that since we take the
  	 * minimum below, and we don't want to go above our
  	 * default due to hardware restrictions.
  	 */
  	if (sta_priv->max_agg_bufsize == 0)
  		sta_priv->max_agg_bufsize =
  			LINK_QUAL_AGG_FRAME_LIMIT_DEF;
  
  	/*
  	 * Even though in theory the peer could have different
  	 * aggregation reorder buffer sizes for different sessions,
  	 * our ucode doesn't allow for that and has a global limit
  	 * for each station. Therefore, use the minimum of all the
  	 * aggregation sessions and our default value.
  	 */
  	sta_priv->max_agg_bufsize =
  		min(sta_priv->max_agg_bufsize, buf_size);
  
  	if (priv->hw_params.use_rts_for_aggregation) {
  		/*
  		 * switch to RTS/CTS if it is the prefer protection
  		 * method for HT traffic
  		 */
  
  		sta_priv->lq_sta.lq.general_params.flags |=
  			LINK_QUAL_FLAGS_SET_STA_TLC_RTS_MSK;
  	}
  	priv->agg_tids_count++;
  	IWL_DEBUG_HT(priv, "priv->agg_tids_count = %u\n",
  		     priv->agg_tids_count);
  
  	sta_priv->lq_sta.lq.agg_params.agg_frame_cnt_limit =
  		sta_priv->max_agg_bufsize;
  
  	IWL_DEBUG_HT(priv, "Tx aggregation enabled on ra = %pM tid = %d\n",
  		 sta->addr, tid);
  
  	return iwl_send_lq_cmd(priv, ctx,
  			&sta_priv->lq_sta.lq, CMD_ASYNC, false);
  }
  
  static void iwlagn_check_ratid_empty(struct iwl_priv *priv, int sta_id, u8 tid)
  {
  	struct iwl_tid_data *tid_data = &priv->tid_data[sta_id][tid];
  	enum iwl_rxon_context_id ctx;
  	struct ieee80211_vif *vif;
  	u8 *addr;
  
  	lockdep_assert_held(&priv->sta_lock);
  
  	addr = priv->stations[sta_id].sta.sta.addr;
  	ctx = priv->stations[sta_id].ctxid;
  	vif = priv->contexts[ctx].vif;
  
  	switch (priv->tid_data[sta_id][tid].agg.state) {
  	case IWL_EMPTYING_HW_QUEUE_DELBA:
  		/* There are no packets for this RA / TID in the HW any more */
  		if (tid_data->agg.ssn == tid_data->next_reclaimed) {
  			IWL_DEBUG_TX_QUEUES(priv,
  				"Can continue DELBA flow ssn = next_recl = %d\n",
  				tid_data->next_reclaimed);
  			iwl_trans_txq_disable(priv->trans,
  					      tid_data->agg.txq_id, true);
  			iwlagn_dealloc_agg_txq(priv, tid_data->agg.txq_id);
  			tid_data->agg.state = IWL_AGG_OFF;
  			ieee80211_stop_tx_ba_cb_irqsafe(vif, addr, tid);
  		}
  		break;
  	case IWL_EMPTYING_HW_QUEUE_ADDBA:
  		/* There are no packets for this RA / TID in the HW any more */
  		if (tid_data->agg.ssn == tid_data->next_reclaimed) {
  			IWL_DEBUG_TX_QUEUES(priv,
  				"Can continue ADDBA flow ssn = next_recl = %d\n",
  				tid_data->next_reclaimed);
  			tid_data->agg.state = IWL_AGG_STARTING;
  			ieee80211_start_tx_ba_cb_irqsafe(vif, addr, tid);
  		}
  		break;
  	default:
  		break;
  	}
  }
  
  static void iwlagn_non_agg_tx_status(struct iwl_priv *priv,
  				     struct iwl_rxon_context *ctx,
  				     const u8 *addr1)
  {
  	struct ieee80211_sta *sta;
  	struct iwl_station_priv *sta_priv;
  
  	rcu_read_lock();
  	sta = ieee80211_find_sta(ctx->vif, addr1);
  	if (sta) {
  		sta_priv = (void *)sta->drv_priv;
  		/* avoid atomic ops if this isn't a client */
  		if (sta_priv->client &&
  		    atomic_dec_return(&sta_priv->pending_frames) == 0)
  			ieee80211_sta_block_awake(priv->hw, sta, false);
  	}
  	rcu_read_unlock();
  }
  
  /**
   * translate ucode response to mac80211 tx status control values
   */
  static void iwlagn_hwrate_to_tx_control(struct iwl_priv *priv, u32 rate_n_flags,
  				  struct ieee80211_tx_info *info)
  {
  	struct ieee80211_tx_rate *r = &info->status.rates[0];
  
  	info->status.antenna =
  		((rate_n_flags & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS);
  	if (rate_n_flags & RATE_MCS_HT_MSK)
  		r->flags |= IEEE80211_TX_RC_MCS;
  	if (rate_n_flags & RATE_MCS_GF_MSK)
  		r->flags |= IEEE80211_TX_RC_GREEN_FIELD;
  	if (rate_n_flags & RATE_MCS_HT40_MSK)
  		r->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
  	if (rate_n_flags & RATE_MCS_DUP_MSK)
  		r->flags |= IEEE80211_TX_RC_DUP_DATA;
  	if (rate_n_flags & RATE_MCS_SGI_MSK)
  		r->flags |= IEEE80211_TX_RC_SHORT_GI;
  	r->idx = iwlagn_hwrate_to_mac80211_idx(rate_n_flags, info->band);
  }
  
  #ifdef CONFIG_IWLWIFI_DEBUG
  const char *iwl_get_tx_fail_reason(u32 status)
  {
  #define TX_STATUS_FAIL(x) case TX_STATUS_FAIL_ ## x: return #x
  #define TX_STATUS_POSTPONE(x) case TX_STATUS_POSTPONE_ ## x: return #x
  
  	switch (status & TX_STATUS_MSK) {
  	case TX_STATUS_SUCCESS:
  		return "SUCCESS";
  	TX_STATUS_POSTPONE(DELAY);
  	TX_STATUS_POSTPONE(FEW_BYTES);
  	TX_STATUS_POSTPONE(BT_PRIO);
  	TX_STATUS_POSTPONE(QUIET_PERIOD);
  	TX_STATUS_POSTPONE(CALC_TTAK);
  	TX_STATUS_FAIL(INTERNAL_CROSSED_RETRY);
  	TX_STATUS_FAIL(SHORT_LIMIT);
  	TX_STATUS_FAIL(LONG_LIMIT);
  	TX_STATUS_FAIL(FIFO_UNDERRUN);
  	TX_STATUS_FAIL(DRAIN_FLOW);
  	TX_STATUS_FAIL(RFKILL_FLUSH);
  	TX_STATUS_FAIL(LIFE_EXPIRE);
  	TX_STATUS_FAIL(DEST_PS);
  	TX_STATUS_FAIL(HOST_ABORTED);
  	TX_STATUS_FAIL(BT_RETRY);
  	TX_STATUS_FAIL(STA_INVALID);
  	TX_STATUS_FAIL(FRAG_DROPPED);
  	TX_STATUS_FAIL(TID_DISABLE);
  	TX_STATUS_FAIL(FIFO_FLUSHED);
  	TX_STATUS_FAIL(INSUFFICIENT_CF_POLL);
  	TX_STATUS_FAIL(PASSIVE_NO_RX);
  	TX_STATUS_FAIL(NO_BEACON_ON_RADAR);
  	}
  
  	return "UNKNOWN";
  
  #undef TX_STATUS_FAIL
  #undef TX_STATUS_POSTPONE
  }
  #endif /* CONFIG_IWLWIFI_DEBUG */
  
  static void iwlagn_count_agg_tx_err_status(struct iwl_priv *priv, u16 status)
  {
  	status &= AGG_TX_STATUS_MSK;
  
  	switch (status) {
  	case AGG_TX_STATE_UNDERRUN_MSK:
  		priv->reply_agg_tx_stats.underrun++;
  		break;
  	case AGG_TX_STATE_BT_PRIO_MSK:
  		priv->reply_agg_tx_stats.bt_prio++;
  		break;
  	case AGG_TX_STATE_FEW_BYTES_MSK:
  		priv->reply_agg_tx_stats.few_bytes++;
  		break;
  	case AGG_TX_STATE_ABORT_MSK:
  		priv->reply_agg_tx_stats.abort++;
  		break;
  	case AGG_TX_STATE_LAST_SENT_TTL_MSK:
  		priv->reply_agg_tx_stats.last_sent_ttl++;
  		break;
  	case AGG_TX_STATE_LAST_SENT_TRY_CNT_MSK:
  		priv->reply_agg_tx_stats.last_sent_try++;
  		break;
  	case AGG_TX_STATE_LAST_SENT_BT_KILL_MSK:
  		priv->reply_agg_tx_stats.last_sent_bt_kill++;
  		break;
  	case AGG_TX_STATE_SCD_QUERY_MSK:
  		priv->reply_agg_tx_stats.scd_query++;
  		break;
  	case AGG_TX_STATE_TEST_BAD_CRC32_MSK:
  		priv->reply_agg_tx_stats.bad_crc32++;
  		break;
  	case AGG_TX_STATE_RESPONSE_MSK:
  		priv->reply_agg_tx_stats.response++;
  		break;
  	case AGG_TX_STATE_DUMP_TX_MSK:
  		priv->reply_agg_tx_stats.dump_tx++;
  		break;
  	case AGG_TX_STATE_DELAY_TX_MSK:
  		priv->reply_agg_tx_stats.delay_tx++;
  		break;
  	default:
  		priv->reply_agg_tx_stats.unknown++;
  		break;
  	}
  }
  
  static inline u32 iwlagn_get_scd_ssn(struct iwlagn_tx_resp *tx_resp)
  {
  	return le32_to_cpup((__le32 *)&tx_resp->status +
  			    tx_resp->frame_count) & IEEE80211_MAX_SN;
  }
  
  static void iwl_rx_reply_tx_agg(struct iwl_priv *priv,
  				struct iwlagn_tx_resp *tx_resp)
  {
  	struct agg_tx_status *frame_status = &tx_resp->status;
  	int tid = (tx_resp->ra_tid & IWLAGN_TX_RES_TID_MSK) >>
  		IWLAGN_TX_RES_TID_POS;
  	int sta_id = (tx_resp->ra_tid & IWLAGN_TX_RES_RA_MSK) >>
  		IWLAGN_TX_RES_RA_POS;
  	struct iwl_ht_agg *agg = &priv->tid_data[sta_id][tid].agg;
  	u32 status = le16_to_cpu(tx_resp->status.status);
  	int i;
  
  	WARN_ON(tid == IWL_TID_NON_QOS);
  
  	if (agg->wait_for_ba)
  		IWL_DEBUG_TX_REPLY(priv,
  			"got tx response w/o block-ack\n");
  
  	agg->rate_n_flags = le32_to_cpu(tx_resp->rate_n_flags);
  	agg->wait_for_ba = (tx_resp->frame_count > 1);
  
  	/*
  	 * If the BT kill count is non-zero, we'll get this
  	 * notification again.
  	 */
  	if (tx_resp->bt_kill_count && tx_resp->frame_count == 1 &&
  	    priv->lib->bt_params &&
  	    priv->lib->bt_params->advanced_bt_coexist) {
  		IWL_DEBUG_COEX(priv, "receive reply tx w/ bt_kill\n");
  	}
  
  	if (tx_resp->frame_count == 1)
  		return;
  
  	IWL_DEBUG_TX_REPLY(priv, "TXQ %d initial_rate 0x%x ssn %d frm_cnt %d\n",
  			   agg->txq_id,
  			   le32_to_cpu(tx_resp->rate_n_flags),
  			   iwlagn_get_scd_ssn(tx_resp), tx_resp->frame_count);
  
  	/* Construct bit-map of pending frames within Tx window */
  	for (i = 0; i < tx_resp->frame_count; i++) {
  		u16 fstatus = le16_to_cpu(frame_status[i].status);
  		u8 retry_cnt = (fstatus & AGG_TX_TRY_MSK) >> AGG_TX_TRY_POS;
  
  		if (status & AGG_TX_STATUS_MSK)
  			iwlagn_count_agg_tx_err_status(priv, fstatus);
  
  		if (status & (AGG_TX_STATE_FEW_BYTES_MSK |
  			      AGG_TX_STATE_ABORT_MSK))
  			continue;
  
  		if (status & AGG_TX_STATUS_MSK || retry_cnt > 1)
  			IWL_DEBUG_TX_REPLY(priv,
  					   "%d: status %s (0x%04x), try-count (0x%01x)\n",
  					   i,
  					   iwl_get_agg_tx_fail_reason(fstatus),
  					   fstatus & AGG_TX_STATUS_MSK,
  					   retry_cnt);
  	}
  }
  
  #ifdef CONFIG_IWLWIFI_DEBUG
  #define AGG_TX_STATE_FAIL(x) case AGG_TX_STATE_ ## x: return #x
  
  const char *iwl_get_agg_tx_fail_reason(u16 status)
  {
  	status &= AGG_TX_STATUS_MSK;
  	switch (status) {
  	case AGG_TX_STATE_TRANSMITTED:
  		return "SUCCESS";
  		AGG_TX_STATE_FAIL(UNDERRUN_MSK);
  		AGG_TX_STATE_FAIL(BT_PRIO_MSK);
  		AGG_TX_STATE_FAIL(FEW_BYTES_MSK);
  		AGG_TX_STATE_FAIL(ABORT_MSK);
  		AGG_TX_STATE_FAIL(LAST_SENT_TTL_MSK);
  		AGG_TX_STATE_FAIL(LAST_SENT_TRY_CNT_MSK);
  		AGG_TX_STATE_FAIL(LAST_SENT_BT_KILL_MSK);
  		AGG_TX_STATE_FAIL(SCD_QUERY_MSK);
  		AGG_TX_STATE_FAIL(TEST_BAD_CRC32_MSK);
  		AGG_TX_STATE_FAIL(RESPONSE_MSK);
  		AGG_TX_STATE_FAIL(DUMP_TX_MSK);
  		AGG_TX_STATE_FAIL(DELAY_TX_MSK);
  	}
  
  	return "UNKNOWN";
  }
  #endif /* CONFIG_IWLWIFI_DEBUG */
  
  static void iwlagn_count_tx_err_status(struct iwl_priv *priv, u16 status)
  {
  	status &= TX_STATUS_MSK;
  
  	switch (status) {
  	case TX_STATUS_POSTPONE_DELAY:
  		priv->reply_tx_stats.pp_delay++;
  		break;
  	case TX_STATUS_POSTPONE_FEW_BYTES:
  		priv->reply_tx_stats.pp_few_bytes++;
  		break;
  	case TX_STATUS_POSTPONE_BT_PRIO:
  		priv->reply_tx_stats.pp_bt_prio++;
  		break;
  	case TX_STATUS_POSTPONE_QUIET_PERIOD:
  		priv->reply_tx_stats.pp_quiet_period++;
  		break;
  	case TX_STATUS_POSTPONE_CALC_TTAK:
  		priv->reply_tx_stats.pp_calc_ttak++;
  		break;
  	case TX_STATUS_FAIL_INTERNAL_CROSSED_RETRY:
  		priv->reply_tx_stats.int_crossed_retry++;
  		break;
  	case TX_STATUS_FAIL_SHORT_LIMIT:
  		priv->reply_tx_stats.short_limit++;
  		break;
  	case TX_STATUS_FAIL_LONG_LIMIT:
  		priv->reply_tx_stats.long_limit++;
  		break;
  	case TX_STATUS_FAIL_FIFO_UNDERRUN:
  		priv->reply_tx_stats.fifo_underrun++;
  		break;
  	case TX_STATUS_FAIL_DRAIN_FLOW:
  		priv->reply_tx_stats.drain_flow++;
  		break;
  	case TX_STATUS_FAIL_RFKILL_FLUSH:
  		priv->reply_tx_stats.rfkill_flush++;
  		break;
  	case TX_STATUS_FAIL_LIFE_EXPIRE:
  		priv->reply_tx_stats.life_expire++;
  		break;
  	case TX_STATUS_FAIL_DEST_PS:
  		priv->reply_tx_stats.dest_ps++;
  		break;
  	case TX_STATUS_FAIL_HOST_ABORTED:
  		priv->reply_tx_stats.host_abort++;
  		break;
  	case TX_STATUS_FAIL_BT_RETRY:
  		priv->reply_tx_stats.bt_retry++;
  		break;
  	case TX_STATUS_FAIL_STA_INVALID:
  		priv->reply_tx_stats.sta_invalid++;
  		break;
  	case TX_STATUS_FAIL_FRAG_DROPPED:
  		priv->reply_tx_stats.frag_drop++;
  		break;
  	case TX_STATUS_FAIL_TID_DISABLE:
  		priv->reply_tx_stats.tid_disable++;
  		break;
  	case TX_STATUS_FAIL_FIFO_FLUSHED:
  		priv->reply_tx_stats.fifo_flush++;
  		break;
  	case TX_STATUS_FAIL_INSUFFICIENT_CF_POLL:
  		priv->reply_tx_stats.insuff_cf_poll++;
  		break;
  	case TX_STATUS_FAIL_PASSIVE_NO_RX:
  		priv->reply_tx_stats.fail_hw_drop++;
  		break;
  	case TX_STATUS_FAIL_NO_BEACON_ON_RADAR:
  		priv->reply_tx_stats.sta_color_mismatch++;
  		break;
  	default:
  		priv->reply_tx_stats.unknown++;
  		break;
  	}
  }
  
  static void iwlagn_set_tx_status(struct iwl_priv *priv,
  				 struct ieee80211_tx_info *info,
  				 struct iwlagn_tx_resp *tx_resp)
  {
  	u16 status = le16_to_cpu(tx_resp->status.status);
  
  	info->flags &= ~IEEE80211_TX_CTL_AMPDU;
  
  	info->status.rates[0].count = tx_resp->failure_frame + 1;
  	info->flags |= iwl_tx_status_to_mac80211(status);
  	iwlagn_hwrate_to_tx_control(priv, le32_to_cpu(tx_resp->rate_n_flags),
  				    info);
  	if (!iwl_is_tx_success(status))
  		iwlagn_count_tx_err_status(priv, status);
  }
  
  static void iwl_check_abort_status(struct iwl_priv *priv,
  			    u8 frame_count, u32 status)
  {
  	if (frame_count == 1 && status == TX_STATUS_FAIL_RFKILL_FLUSH) {
  		IWL_ERR(priv, "Tx flush command to flush out all frames\n");
  		if (!test_bit(STATUS_EXIT_PENDING, &priv->status))
  			queue_work(priv->workqueue, &priv->tx_flush);
  	}
  }
  
  int iwlagn_rx_reply_tx(struct iwl_priv *priv, struct iwl_rx_cmd_buffer *rxb,
  			       struct iwl_device_cmd *cmd)
  {
  	struct iwl_rx_packet *pkt = rxb_addr(rxb);
  	u16 sequence = le16_to_cpu(pkt->hdr.sequence);
  	int txq_id = SEQ_TO_QUEUE(sequence);
  	int cmd_index __maybe_unused = SEQ_TO_INDEX(sequence);
  	struct iwlagn_tx_resp *tx_resp = (void *)pkt->data;
  	struct ieee80211_hdr *hdr;
  	u32 status = le16_to_cpu(tx_resp->status.status);
  	u16 ssn = iwlagn_get_scd_ssn(tx_resp);
  	int tid;
  	int sta_id;
  	int freed;
  	struct ieee80211_tx_info *info;
  	struct sk_buff_head skbs;
  	struct sk_buff *skb;
  	struct iwl_rxon_context *ctx;
  	bool is_agg = (txq_id >= IWLAGN_FIRST_AMPDU_QUEUE);
  
  	tid = (tx_resp->ra_tid & IWLAGN_TX_RES_TID_MSK) >>
  		IWLAGN_TX_RES_TID_POS;
  	sta_id = (tx_resp->ra_tid & IWLAGN_TX_RES_RA_MSK) >>
  		IWLAGN_TX_RES_RA_POS;
  
  	spin_lock_bh(&priv->sta_lock);
  
  	if (is_agg) {
  		WARN_ON_ONCE(sta_id >= IWLAGN_STATION_COUNT ||
  			     tid >= IWL_MAX_TID_COUNT);
  		if (txq_id != priv->tid_data[sta_id][tid].agg.txq_id)
  			IWL_ERR(priv, "txq_id mismatch: %d %d\n", txq_id,
  				priv->tid_data[sta_id][tid].agg.txq_id);
  		iwl_rx_reply_tx_agg(priv, tx_resp);
  	}
  
  	__skb_queue_head_init(&skbs);
  
  	if (tx_resp->frame_count == 1) {
  		u16 next_reclaimed = le16_to_cpu(tx_resp->seq_ctl);
  		next_reclaimed = IEEE80211_SEQ_TO_SN(next_reclaimed + 0x10);
  
  		if (is_agg) {
  			/* If this is an aggregation queue, we can rely on the
  			 * ssn since the wifi sequence number corresponds to
  			 * the index in the TFD ring (%256).
  			 * The seq_ctl is the sequence control of the packet
  			 * to which this Tx response relates. But if there is a
  			 * hole in the bitmap of the BA we received, this Tx
  			 * response may allow to reclaim the hole and all the
  			 * subsequent packets that were already acked.
  			 * In that case, seq_ctl != ssn, and the next packet
  			 * to be reclaimed will be ssn and not seq_ctl.
  			 */
  			next_reclaimed = ssn;
  		}
  
  		if (tid != IWL_TID_NON_QOS) {
  			priv->tid_data[sta_id][tid].next_reclaimed =
  				next_reclaimed;
  			IWL_DEBUG_TX_REPLY(priv, "Next reclaimed packet:%d\n",
  						  next_reclaimed);
  		}
  
  		iwl_trans_reclaim(priv->trans, txq_id, ssn, &skbs);
  
  		iwlagn_check_ratid_empty(priv, sta_id, tid);
  		freed = 0;
  
  		/* process frames */
  		skb_queue_walk(&skbs, skb) {
  			hdr = (struct ieee80211_hdr *)skb->data;
  
  			if (!ieee80211_is_data_qos(hdr->frame_control))
  				priv->last_seq_ctl = tx_resp->seq_ctl;
  
  			info = IEEE80211_SKB_CB(skb);
  			ctx = info->driver_data[0];
  			iwl_trans_free_tx_cmd(priv->trans,
  					      info->driver_data[1]);
  
  			memset(&info->status, 0, sizeof(info->status));
  
  			if (status == TX_STATUS_FAIL_PASSIVE_NO_RX &&
  			    ctx->vif &&
  			    ctx->vif->type == NL80211_IFTYPE_STATION) {
  				/* block and stop all queues */
  				priv->passive_no_rx = true;
  				IWL_DEBUG_TX_QUEUES(priv,
  					"stop all queues: passive channel\n");
  				ieee80211_stop_queues(priv->hw);
  
  				IWL_DEBUG_TX_REPLY(priv,
  					   "TXQ %d status %s (0x%08x) "
  					   "rate_n_flags 0x%x retries %d\n",
  					   txq_id,
  					   iwl_get_tx_fail_reason(status),
  					   status,
  					   le32_to_cpu(tx_resp->rate_n_flags),
  					   tx_resp->failure_frame);
  
  				IWL_DEBUG_TX_REPLY(priv,
  					   "FrameCnt = %d, idx=%d\n",
  					   tx_resp->frame_count, cmd_index);
  			}
  
  			/* check if BAR is needed */
  			if (is_agg && !iwl_is_tx_success(status))
  				info->flags |= IEEE80211_TX_STAT_AMPDU_NO_BACK;
  			iwlagn_set_tx_status(priv, IEEE80211_SKB_CB(skb),
  				     tx_resp);
  			if (!is_agg)
  				iwlagn_non_agg_tx_status(priv, ctx, hdr->addr1);
  
  			freed++;
  		}
  
  		if (tid != IWL_TID_NON_QOS) {
  			priv->tid_data[sta_id][tid].next_reclaimed =
  				next_reclaimed;
  			IWL_DEBUG_TX_REPLY(priv, "Next reclaimed packet:%d\n",
  					   next_reclaimed);
  		}
  
  		if (!is_agg && freed != 1)
  			IWL_ERR(priv, "Q: %d, freed %d\n", txq_id, freed);
  
  		IWL_DEBUG_TX_REPLY(priv, "TXQ %d status %s (0x%08x)\n", txq_id,
  				   iwl_get_tx_fail_reason(status), status);
  
  		IWL_DEBUG_TX_REPLY(priv,
  				   "\t\t\t\tinitial_rate 0x%x retries %d, idx=%d ssn=%d seq_ctl=0x%x\n",
  				   le32_to_cpu(tx_resp->rate_n_flags),
  				   tx_resp->failure_frame,
  				   SEQ_TO_INDEX(sequence), ssn,
  				   le16_to_cpu(tx_resp->seq_ctl));
  	}
  
  	iwl_check_abort_status(priv, tx_resp->frame_count, status);
  	spin_unlock_bh(&priv->sta_lock);
  
  	while (!skb_queue_empty(&skbs)) {
  		skb = __skb_dequeue(&skbs);
  		ieee80211_tx_status(priv->hw, skb);
  	}
  
  	return 0;
  }
  
  /**
   * iwlagn_rx_reply_compressed_ba - Handler for REPLY_COMPRESSED_BA
   *
   * Handles block-acknowledge notification from device, which reports success
   * of frames sent via aggregation.
   */
  int iwlagn_rx_reply_compressed_ba(struct iwl_priv *priv,
  				   struct iwl_rx_cmd_buffer *rxb,
  				   struct iwl_device_cmd *cmd)
  {
  	struct iwl_rx_packet *pkt = rxb_addr(rxb);
  	struct iwl_compressed_ba_resp *ba_resp = (void *)pkt->data;
  	struct iwl_ht_agg *agg;
  	struct sk_buff_head reclaimed_skbs;
  	struct sk_buff *skb;
  	int sta_id;
  	int tid;
  	int freed;
  
  	/* "flow" corresponds to Tx queue */
  	u16 scd_flow = le16_to_cpu(ba_resp->scd_flow);
  
  	/* "ssn" is start of block-ack Tx window, corresponds to index
  	 * (in Tx queue's circular buffer) of first TFD/frame in window */
  	u16 ba_resp_scd_ssn = le16_to_cpu(ba_resp->scd_ssn);
  
  	if (scd_flow >= priv->cfg->base_params->num_of_queues) {
  		IWL_ERR(priv,
  			"BUG_ON scd_flow is bigger than number of queues\n");
  		return 0;
  	}
  
  	sta_id = ba_resp->sta_id;
  	tid = ba_resp->tid;
  	agg = &priv->tid_data[sta_id][tid].agg;
  
  	spin_lock_bh(&priv->sta_lock);
  
  	if (unlikely(!agg->wait_for_ba)) {
  		if (unlikely(ba_resp->bitmap))
  			IWL_ERR(priv, "Received BA when not expected\n");
  		spin_unlock_bh(&priv->sta_lock);
  		return 0;
  	}
  
  	if (unlikely(scd_flow != agg->txq_id)) {
  		/*
  		 * FIXME: this is a uCode bug which need to be addressed,
  		 * log the information and return for now.
  		 * Since it is can possibly happen very often and in order
  		 * not to fill the syslog, don't use IWL_ERR or IWL_WARN
  		 */
  		IWL_DEBUG_TX_QUEUES(priv,
  				    "Bad queue mapping txq_id=%d, agg_txq[sta:%d,tid:%d]=%d\n",
  				    scd_flow, sta_id, tid, agg->txq_id);
  		spin_unlock_bh(&priv->sta_lock);
  		return 0;
  	}
  
  	__skb_queue_head_init(&reclaimed_skbs);
  
  	/* Release all TFDs before the SSN, i.e. all TFDs in front of
  	 * block-ack window (we assume that they've been successfully
  	 * transmitted ... if not, it's too late anyway). */
  	iwl_trans_reclaim(priv->trans, scd_flow, ba_resp_scd_ssn,
  			  &reclaimed_skbs);
  
  	IWL_DEBUG_TX_REPLY(priv, "REPLY_COMPRESSED_BA [%d] Received from %pM, "
  			   "sta_id = %d\n",
  			   agg->wait_for_ba,
  			   (u8 *) &ba_resp->sta_addr_lo32,
  			   ba_resp->sta_id);
  	IWL_DEBUG_TX_REPLY(priv, "TID = %d, SeqCtl = %d, bitmap = 0x%llx, "
  			   "scd_flow = %d, scd_ssn = %d sent:%d, acked:%d\n",
  			   ba_resp->tid, le16_to_cpu(ba_resp->seq_ctl),
  			   (unsigned long long)le64_to_cpu(ba_resp->bitmap),
  			   scd_flow, ba_resp_scd_ssn, ba_resp->txed,
  			   ba_resp->txed_2_done);
  
  	/* Mark that the expected block-ack response arrived */
  	agg->wait_for_ba = false;
  
  	/* Sanity check values reported by uCode */
  	if (ba_resp->txed_2_done > ba_resp->txed) {
  		IWL_DEBUG_TX_REPLY(priv,
  			"bogus sent(%d) and ack(%d) count\n",
  			ba_resp->txed, ba_resp->txed_2_done);
  		/*
  		 * set txed_2_done = txed,
  		 * so it won't impact rate scale
  		 */
  		ba_resp->txed = ba_resp->txed_2_done;
  	}
  
  	priv->tid_data[sta_id][tid].next_reclaimed = ba_resp_scd_ssn;
  
  	iwlagn_check_ratid_empty(priv, sta_id, tid);
  	freed = 0;
  
  	skb_queue_walk(&reclaimed_skbs, skb) {
  		struct ieee80211_hdr *hdr = (void *)skb->data;
  		struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
  
  		if (ieee80211_is_data_qos(hdr->frame_control))
  			freed++;
  		else
  			WARN_ON_ONCE(1);
  
  		iwl_trans_free_tx_cmd(priv->trans, info->driver_data[1]);
  
  		memset(&info->status, 0, sizeof(info->status));
  		/* Packet was transmitted successfully, failures come as single
  		 * frames because before failing a frame the firmware transmits
  		 * it without aggregation at least once.
  		 */
  		info->flags |= IEEE80211_TX_STAT_ACK;
  
  		if (freed == 1) {
  			/* this is the first skb we deliver in this batch */
  			/* put the rate scaling data there */
  			info = IEEE80211_SKB_CB(skb);
  			memset(&info->status, 0, sizeof(info->status));
  			info->flags |= IEEE80211_TX_STAT_AMPDU;
  			info->status.ampdu_ack_len = ba_resp->txed_2_done;
  			info->status.ampdu_len = ba_resp->txed;
  			iwlagn_hwrate_to_tx_control(priv, agg->rate_n_flags,
  						    info);
  		}
  	}
  
  	spin_unlock_bh(&priv->sta_lock);
  
  	while (!skb_queue_empty(&reclaimed_skbs)) {
  		skb = __skb_dequeue(&reclaimed_skbs);
  		ieee80211_tx_status(priv->hw, skb);
  	}
  
  	return 0;
  }
  