drivers/net/wireless/ath/ath9k/htc_drv_txrx.c - arm/linux-arm64-legacy - Git at Google

 /*
  * Copyright (c) 2010 Atheros Communications Inc.
  *
  * 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.
  */

 #include "htc.h"

 /******/
 /* TX */
 /******/

 int get_hw_qnum(u16 queue, int *hwq_map)
 {
 	switch (queue) {
 	case 0:
 		return hwq_map[ATH9K_WME_AC_VO];
 	case 1:
 		return hwq_map[ATH9K_WME_AC_VI];
 	case 2:
 		return hwq_map[ATH9K_WME_AC_BE];
 	case 3:
 		return hwq_map[ATH9K_WME_AC_BK];
 	default:
 		return hwq_map[ATH9K_WME_AC_BE];
 	}
 }

 int ath_htc_txq_update(struct ath9k_htc_priv *priv, int qnum,
 		       struct ath9k_tx_queue_info *qinfo)
 {
 	struct ath_hw *ah = priv->ah;
 	int error = 0;
 	struct ath9k_tx_queue_info qi;

 	ath9k_hw_get_txq_props(ah, qnum, &qi);

 	qi.tqi_aifs = qinfo->tqi_aifs;
 	qi.tqi_cwmin = qinfo->tqi_cwmin / 2; /* XXX */
 	qi.tqi_cwmax = qinfo->tqi_cwmax;
 	qi.tqi_burstTime = qinfo->tqi_burstTime;
 	qi.tqi_readyTime = qinfo->tqi_readyTime;

 	if (!ath9k_hw_set_txq_props(ah, qnum, &qi)) {
 		ath_print(ath9k_hw_common(ah), ATH_DBG_FATAL,
 			  "Unable to update hardware queue %u!\n", qnum);
 		error = -EIO;
 	} else {
 		ath9k_hw_resettxqueue(ah, qnum);
 	}

 	return error;
 }

 int ath9k_htc_tx_start(struct ath9k_htc_priv *priv, struct sk_buff *skb)
 {
 	struct ieee80211_hdr *hdr;
 	struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
 	struct ieee80211_sta *sta = tx_info->control.sta;
 	struct ath9k_htc_sta *ista;
 	struct ath9k_htc_vif *avp;
 	struct ath9k_htc_tx_ctl tx_ctl;
 	enum htc_endpoint_id epid;
 	u16 qnum, hw_qnum;
 	__le16 fc;
 	u8 *tx_fhdr;
 	u8 sta_idx;

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

 	avp = (struct ath9k_htc_vif *) tx_info->control.vif->drv_priv;
 	if (sta) {
 		ista = (struct ath9k_htc_sta *) sta->drv_priv;
 		sta_idx = ista->index;
 	} else {
 		sta_idx = 0;
 	}

 	memset(&tx_ctl, 0, sizeof(struct ath9k_htc_tx_ctl));

 	if (ieee80211_is_data(fc)) {
 		struct tx_frame_hdr tx_hdr;
 		u8 *qc;

 		memset(&tx_hdr, 0, sizeof(struct tx_frame_hdr));

 		tx_hdr.node_idx = sta_idx;
 		tx_hdr.vif_idx = avp->index;

 		if (tx_info->flags & IEEE80211_TX_CTL_AMPDU) {
 			tx_ctl.type = ATH9K_HTC_AMPDU;
 			tx_hdr.data_type = ATH9K_HTC_AMPDU;
 		} else {
 			tx_ctl.type = ATH9K_HTC_NORMAL;
 			tx_hdr.data_type = ATH9K_HTC_NORMAL;
 		}

 		if (ieee80211_is_data(fc)) {
 			qc = ieee80211_get_qos_ctl(hdr);
 			tx_hdr.tidno = qc[0] & IEEE80211_QOS_CTL_TID_MASK;
 		}

 		/* Check for RTS protection */
 		if (priv->hw->wiphy->rts_threshold != (u32) -1)
 			if (skb->len > priv->hw->wiphy->rts_threshold)
 				tx_hdr.flags |= ATH9K_HTC_TX_RTSCTS;

 		/* CTS-to-self */
 		if (!(tx_hdr.flags & ATH9K_HTC_TX_RTSCTS) &&
 		    (priv->op_flags & OP_PROTECT_ENABLE))
 			tx_hdr.flags |= ATH9K_HTC_TX_CTSONLY;

 		tx_hdr.key_type = ath9k_cmn_get_hw_crypto_keytype(skb);
 		if (tx_hdr.key_type == ATH9K_KEY_TYPE_CLEAR)
 			tx_hdr.keyix = (u8) ATH9K_TXKEYIX_INVALID;
 		else
 			tx_hdr.keyix = tx_info->control.hw_key->hw_key_idx;

 		tx_fhdr = skb_push(skb, sizeof(tx_hdr));
 		memcpy(tx_fhdr, (u8 *) &tx_hdr, sizeof(tx_hdr));

 		qnum = skb_get_queue_mapping(skb);
 		hw_qnum = get_hw_qnum(qnum, priv->hwq_map);

 		switch (hw_qnum) {
 		case 0:
 			epid = priv->data_be_ep;
 			break;
 		case 2:
 			epid = priv->data_vi_ep;
 			break;
 		case 3:
 			epid = priv->data_vo_ep;
 			break;
 		case 1:
 		default:
 			epid = priv->data_bk_ep;
 			break;
 		}
 	} else {
 		struct tx_mgmt_hdr mgmt_hdr;

 		memset(&mgmt_hdr, 0, sizeof(struct tx_mgmt_hdr));

 		tx_ctl.type = ATH9K_HTC_NORMAL;

 		mgmt_hdr.node_idx = sta_idx;
 		mgmt_hdr.vif_idx = avp->index;
 		mgmt_hdr.tidno = 0;
 		mgmt_hdr.flags = 0;

 		mgmt_hdr.key_type = ath9k_cmn_get_hw_crypto_keytype(skb);
 		if (mgmt_hdr.key_type == ATH9K_KEY_TYPE_CLEAR)
 			mgmt_hdr.keyix = (u8) ATH9K_TXKEYIX_INVALID;
 		else
 			mgmt_hdr.keyix = tx_info->control.hw_key->hw_key_idx;

 		tx_fhdr = skb_push(skb, sizeof(mgmt_hdr));
 		memcpy(tx_fhdr, (u8 *) &mgmt_hdr, sizeof(mgmt_hdr));
 		epid = priv->mgmt_ep;
 	}

 	return htc_send(priv->htc, skb, epid, &tx_ctl);
 }

 void ath9k_tx_tasklet(unsigned long data)
 {
 	struct ath9k_htc_priv *priv = (struct ath9k_htc_priv *)data;
 	struct ieee80211_sta *sta;
 	struct ieee80211_hdr *hdr;
 	struct ieee80211_tx_info *tx_info;
 	struct sk_buff *skb = NULL;
 	__le16 fc;

 	while ((skb = skb_dequeue(&priv->tx_queue)) != NULL) {

 		hdr = (struct ieee80211_hdr *) skb->data;
 		fc = hdr->frame_control;
 		tx_info = IEEE80211_SKB_CB(skb);

 		memset(&tx_info->status, 0, sizeof(tx_info->status));

 		rcu_read_lock();

 		sta = ieee80211_find_sta(priv->vif, hdr->addr1);
 		if (!sta) {
 			rcu_read_unlock();
 			ieee80211_tx_status(priv->hw, skb);
 			continue;
 		}

 		/* Check if we need to start aggregation */

 		if (sta && conf_is_ht(&priv->hw->conf) &&
 		    (priv->op_flags & OP_TXAGGR)
 		    && !(skb->protocol == cpu_to_be16(ETH_P_PAE))) {
 			if (ieee80211_is_data_qos(fc)) {
 				u8 *qc, tid;
 				struct ath9k_htc_sta *ista;

 				qc = ieee80211_get_qos_ctl(hdr);
 				tid = qc[0] & 0xf;
 				ista = (struct ath9k_htc_sta *)sta->drv_priv;

 				if ((tid < ATH9K_HTC_MAX_TID) &&
 				    ista->tid_state[tid] == AGGR_STOP) {
 					ieee80211_start_tx_ba_session(sta, tid);
 					ista->tid_state[tid] = AGGR_PROGRESS;
 				}
 			}
 		}

 		rcu_read_unlock();

 		/* Send status to mac80211 */
 		ieee80211_tx_status(priv->hw, skb);
 	}

 	/* Wake TX queues if needed */
 	spin_lock_bh(&priv->tx_lock);
 	if (priv->tx_queues_stop) {
 		priv->tx_queues_stop = false;
 		spin_unlock_bh(&priv->tx_lock);
 		ath_print(ath9k_hw_common(priv->ah), ATH_DBG_XMIT,
 			  "Waking up TX queues\n");
 		ieee80211_wake_queues(priv->hw);
 		return;
 	}
 	spin_unlock_bh(&priv->tx_lock);
 }

 void ath9k_htc_txep(void *drv_priv, struct sk_buff *skb,
 		    enum htc_endpoint_id ep_id, bool txok)
 {
 	struct ath9k_htc_priv *priv = (struct ath9k_htc_priv *) drv_priv;
 	struct ath_common *common = ath9k_hw_common(priv->ah);
 	struct ieee80211_tx_info *tx_info;

 	if (!skb)
 		return;

 	if (ep_id == priv->mgmt_ep) {
 		skb_pull(skb, sizeof(struct tx_mgmt_hdr));
 	} else if ((ep_id == priv->data_bk_ep) ||
 		   (ep_id == priv->data_be_ep) ||
 		   (ep_id == priv->data_vi_ep) ||
 		   (ep_id == priv->data_vo_ep)) {
 		skb_pull(skb, sizeof(struct tx_frame_hdr));
 	} else {
 		ath_print(common, ATH_DBG_FATAL,
 			  "Unsupported TX EPID: %d\n", ep_id);
 		dev_kfree_skb_any(skb);
 		return;
 	}

 	tx_info = IEEE80211_SKB_CB(skb);

 	if (txok)
 		tx_info->flags |= IEEE80211_TX_STAT_ACK;

 	skb_queue_tail(&priv->tx_queue, skb);
 	tasklet_schedule(&priv->tx_tasklet);
 }

 int ath9k_tx_init(struct ath9k_htc_priv *priv)
 {
 	skb_queue_head_init(&priv->tx_queue);
 	return 0;
 }

 void ath9k_tx_cleanup(struct ath9k_htc_priv *priv)
 {

 }

 bool ath9k_htc_txq_setup(struct ath9k_htc_priv *priv,
 			 enum ath9k_tx_queue_subtype subtype)
 {
 	struct ath_hw *ah = priv->ah;
 	struct ath_common *common = ath9k_hw_common(ah);
 	struct ath9k_tx_queue_info qi;
 	int qnum;

 	memset(&qi, 0, sizeof(qi));

 	qi.tqi_subtype = subtype;
 	qi.tqi_aifs = ATH9K_TXQ_USEDEFAULT;
 	qi.tqi_cwmin = ATH9K_TXQ_USEDEFAULT;
 	qi.tqi_cwmax = ATH9K_TXQ_USEDEFAULT;
 	qi.tqi_physCompBuf = 0;
 	qi.tqi_qflags = TXQ_FLAG_TXEOLINT_ENABLE | TXQ_FLAG_TXDESCINT_ENABLE;

 	qnum = ath9k_hw_setuptxqueue(priv->ah, ATH9K_TX_QUEUE_DATA, &qi);
 	if (qnum == -1)
 		return false;

 	if (qnum >= ARRAY_SIZE(priv->hwq_map)) {
 		ath_print(common, ATH_DBG_FATAL,
 			  "qnum %u out of range, max %u!\n",
 			  qnum, (unsigned int)ARRAY_SIZE(priv->hwq_map));
 		ath9k_hw_releasetxqueue(ah, qnum);
 		return false;
 	}

 	priv->hwq_map[subtype] = qnum;
 	return true;
 }

 /******/
 /* RX */
 /******/

 /*
  * Calculate the RX filter to be set in the HW.
  */
 u32 ath9k_htc_calcrxfilter(struct ath9k_htc_priv *priv)
 {
 #define	RX_FILTER_PRESERVE (ATH9K_RX_FILTER_PHYERR | ATH9K_RX_FILTER_PHYRADAR)

 	struct ath_hw *ah = priv->ah;
 	u32 rfilt;

 	rfilt = (ath9k_hw_getrxfilter(ah) & RX_FILTER_PRESERVE)
 		| ATH9K_RX_FILTER_UCAST | ATH9K_RX_FILTER_BCAST
 		| ATH9K_RX_FILTER_MCAST;

 	/* If not a STA, enable processing of Probe Requests */
 	if (ah->opmode != NL80211_IFTYPE_STATION)
 		rfilt |= ATH9K_RX_FILTER_PROBEREQ;

 	/*
 	 * Set promiscuous mode when FIF_PROMISC_IN_BSS is enabled for station
 	 * mode interface or when in monitor mode. AP mode does not need this
 	 * since it receives all in-BSS frames anyway.
 	 */
 	if (((ah->opmode != NL80211_IFTYPE_AP) &&
 	     (priv->rxfilter & FIF_PROMISC_IN_BSS)) ||
 	    (ah->opmode == NL80211_IFTYPE_MONITOR))
 		rfilt |= ATH9K_RX_FILTER_PROM;

 	if (priv->rxfilter & FIF_CONTROL)
 		rfilt |= ATH9K_RX_FILTER_CONTROL;

 	if ((ah->opmode == NL80211_IFTYPE_STATION) &&
 	    !(priv->rxfilter & FIF_BCN_PRBRESP_PROMISC))
 		rfilt |= ATH9K_RX_FILTER_MYBEACON;
 	else
 		rfilt |= ATH9K_RX_FILTER_BEACON;

 	if (conf_is_ht(&priv->hw->conf))
 		rfilt |= ATH9K_RX_FILTER_COMP_BAR;

 	return rfilt;

 #undef RX_FILTER_PRESERVE
 }

 /*
  * Recv initialization for opmode change.
  */
 static void ath9k_htc_opmode_init(struct ath9k_htc_priv *priv)
 {
 	struct ath_hw *ah = priv->ah;
 	struct ath_common *common = ath9k_hw_common(ah);

 	u32 rfilt, mfilt[2];

 	/* configure rx filter */
 	rfilt = ath9k_htc_calcrxfilter(priv);
 	ath9k_hw_setrxfilter(ah, rfilt);

 	/* configure bssid mask */
 	if (ah->caps.hw_caps & ATH9K_HW_CAP_BSSIDMASK)
 		ath_hw_setbssidmask(common);

 	/* configure operational mode */
 	ath9k_hw_setopmode(ah);

 	/* Handle any link-level address change. */
 	ath9k_hw_setmac(ah, common->macaddr);

 	/* calculate and install multicast filter */
 	mfilt[0] = mfilt[1] = ~0;
 	ath9k_hw_setmcastfilter(ah, mfilt[0], mfilt[1]);
 }

 void ath9k_host_rx_init(struct ath9k_htc_priv *priv)
 {
 	ath9k_hw_rxena(priv->ah);
 	ath9k_htc_opmode_init(priv);
 	ath9k_hw_startpcureceive(priv->ah);
 	priv->rx.last_rssi = ATH_RSSI_DUMMY_MARKER;
 }

 static void ath9k_process_rate(struct ieee80211_hw *hw,
 			       struct ieee80211_rx_status *rxs,
 			       u8 rx_rate, u8 rs_flags)
 {
 	struct ieee80211_supported_band *sband;
 	enum ieee80211_band band;
 	unsigned int i = 0;

 	if (rx_rate & 0x80) {
 		/* HT rate */
 		rxs->flag |= RX_FLAG_HT;
 		if (rs_flags & ATH9K_RX_2040)
 			rxs->flag |= RX_FLAG_40MHZ;
 		if (rs_flags & ATH9K_RX_GI)
 			rxs->flag |= RX_FLAG_SHORT_GI;
 		rxs->rate_idx = rx_rate & 0x7f;
 		return;
 	}

 	band = hw->conf.channel->band;
 	sband = hw->wiphy->bands[band];

 	for (i = 0; i < sband->n_bitrates; i++) {
 		if (sband->bitrates[i].hw_value == rx_rate) {
 			rxs->rate_idx = i;
 			return;
 		}
 		if (sband->bitrates[i].hw_value_short == rx_rate) {
 			rxs->rate_idx = i;
 			rxs->flag |= RX_FLAG_SHORTPRE;
 			return;
 		}
 	}

 }

 static bool ath9k_rx_prepare(struct ath9k_htc_priv *priv,
 			     struct ath9k_htc_rxbuf *rxbuf,
 			     struct ieee80211_rx_status *rx_status)

 {
 	struct ieee80211_hdr *hdr;
 	struct ieee80211_hw *hw = priv->hw;
 	struct sk_buff *skb = rxbuf->skb;
 	struct ath_common *common = ath9k_hw_common(priv->ah);
 	struct ath_htc_rx_status *rxstatus;
 	int hdrlen, padpos, padsize;
 	int last_rssi = ATH_RSSI_DUMMY_MARKER;
 	__le16 fc;

 	if (skb->len <= HTC_RX_FRAME_HEADER_SIZE) {
 		ath_print(common, ATH_DBG_FATAL,
 			  "Corrupted RX frame, dropping\n");
 		goto rx_next;
 	}

 	rxstatus = (struct ath_htc_rx_status *)skb->data;

 	if (be16_to_cpu(rxstatus->rs_datalen) -
 	    (skb->len - HTC_RX_FRAME_HEADER_SIZE) != 0) {
 		ath_print(common, ATH_DBG_FATAL,
 			  "Corrupted RX data len, dropping "
 			  "(dlen: %d, skblen: %d)\n",
 			  rxstatus->rs_datalen, skb->len);
 		goto rx_next;
 	}

 	/* Get the RX status information */
 	memcpy(&rxbuf->rxstatus, rxstatus, HTC_RX_FRAME_HEADER_SIZE);
 	skb_pull(skb, HTC_RX_FRAME_HEADER_SIZE);

 	hdr = (struct ieee80211_hdr *)skb->data;
 	fc = hdr->frame_control;
 	hdrlen = ieee80211_get_hdrlen_from_skb(skb);

 	padpos = ath9k_cmn_padpos(fc);

 	padsize = padpos & 3;
 	if (padsize && skb->len >= padpos+padsize+FCS_LEN) {
 		memmove(skb->data + padsize, skb->data, padpos);
 		skb_pull(skb, padsize);
 	}

 	memset(rx_status, 0, sizeof(struct ieee80211_rx_status));

 	if (rxbuf->rxstatus.rs_status != 0) {
 		if (rxbuf->rxstatus.rs_status & ATH9K_RXERR_CRC)
 			rx_status->flag |= RX_FLAG_FAILED_FCS_CRC;
 		if (rxbuf->rxstatus.rs_status & ATH9K_RXERR_PHY)
 			goto rx_next;

 		if (rxbuf->rxstatus.rs_status & ATH9K_RXERR_DECRYPT) {
 			/* FIXME */
 		} else if (rxbuf->rxstatus.rs_status & ATH9K_RXERR_MIC) {
 			if (ieee80211_is_ctl(fc))
 				/*
 				 * Sometimes, we get invalid
 				 * MIC failures on valid control frames.
 				 * Remove these mic errors.
 				 */
 				rxbuf->rxstatus.rs_status &= ~ATH9K_RXERR_MIC;
 			else
 				rx_status->flag |= RX_FLAG_MMIC_ERROR;
 		}

 		/*
 		 * Reject error frames with the exception of
 		 * decryption and MIC failures. For monitor mode,
 		 * we also ignore the CRC error.
 		 */
 		if (priv->ah->opmode == NL80211_IFTYPE_MONITOR) {
 			if (rxbuf->rxstatus.rs_status &
 			    ~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC |
 			      ATH9K_RXERR_CRC))
 				goto rx_next;
 		} else {
 			if (rxbuf->rxstatus.rs_status &
 			    ~(ATH9K_RXERR_DECRYPT | ATH9K_RXERR_MIC)) {
 				goto rx_next;
 			}
 		}
 	}

 	if (!(rxbuf->rxstatus.rs_status & ATH9K_RXERR_DECRYPT)) {
 		u8 keyix;
 		keyix = rxbuf->rxstatus.rs_keyix;
 		if (keyix != ATH9K_RXKEYIX_INVALID) {
 			rx_status->flag |= RX_FLAG_DECRYPTED;
 		} else if (ieee80211_has_protected(fc) &&
 			   skb->len >= hdrlen + 4) {
 			keyix = skb->data[hdrlen + 3] >> 6;
 			if (test_bit(keyix, common->keymap))
 				rx_status->flag |= RX_FLAG_DECRYPTED;
 		}
 	}

 	ath9k_process_rate(hw, rx_status, rxbuf->rxstatus.rs_rate,
 			   rxbuf->rxstatus.rs_flags);

 	if (priv->op_flags & OP_ASSOCIATED) {
 		if (rxbuf->rxstatus.rs_rssi != ATH9K_RSSI_BAD &&
 		    !rxbuf->rxstatus.rs_moreaggr)
 			ATH_RSSI_LPF(priv->rx.last_rssi,
 				     rxbuf->rxstatus.rs_rssi);

 		last_rssi = priv->rx.last_rssi;

 		if (likely(last_rssi != ATH_RSSI_DUMMY_MARKER))
 			rxbuf->rxstatus.rs_rssi = ATH_EP_RND(last_rssi,
 							     ATH_RSSI_EP_MULTIPLIER);

 		if (rxbuf->rxstatus.rs_rssi < 0)
 			rxbuf->rxstatus.rs_rssi = 0;

 		if (ieee80211_is_beacon(fc))
 			priv->ah->stats.avgbrssi = rxbuf->rxstatus.rs_rssi;
 	}

 	rx_status->mactime = be64_to_cpu(rxbuf->rxstatus.rs_tstamp);
 	rx_status->band = hw->conf.channel->band;
 	rx_status->freq = hw->conf.channel->center_freq;
 	rx_status->signal =  rxbuf->rxstatus.rs_rssi + ATH_DEFAULT_NOISE_FLOOR;
 	rx_status->antenna = rxbuf->rxstatus.rs_antenna;
 	rx_status->flag |= RX_FLAG_TSFT;

 	return true;

 rx_next:
 	return false;
 }

 /*
  * FIXME: Handle FLUSH later on.
  */
 void ath9k_rx_tasklet(unsigned long data)
 {
 	struct ath9k_htc_priv *priv = (struct ath9k_htc_priv *)data;
 	struct ath9k_htc_rxbuf *rxbuf = NULL, *tmp_buf = NULL;
 	struct ieee80211_rx_status rx_status;
 	struct sk_buff *skb;
 	unsigned long flags;
 	struct ieee80211_hdr *hdr;

 	do {
 		spin_lock_irqsave(&priv->rx.rxbuflock, flags);
 		list_for_each_entry(tmp_buf, &priv->rx.rxbuf, list) {
 			if (tmp_buf->in_process) {
 				rxbuf = tmp_buf;
 				break;
 			}
 		}

 		if (rxbuf == NULL) {
 			spin_unlock_irqrestore(&priv->rx.rxbuflock, flags);
 			break;
 		}

 		if (!rxbuf->skb)
 			goto requeue;

 		if (!ath9k_rx_prepare(priv, rxbuf, &rx_status)) {
 			dev_kfree_skb_any(rxbuf->skb);
 			goto requeue;
 		}

 		memcpy(IEEE80211_SKB_RXCB(rxbuf->skb), &rx_status,
 		       sizeof(struct ieee80211_rx_status));
 		skb = rxbuf->skb;
 		hdr = (struct ieee80211_hdr *) skb->data;

 		if (ieee80211_is_beacon(hdr->frame_control) && priv->ps_enabled)
 				ieee80211_queue_work(priv->hw, &priv->ps_work);

 		spin_unlock_irqrestore(&priv->rx.rxbuflock, flags);

 		ieee80211_rx(priv->hw, skb);

 		spin_lock_irqsave(&priv->rx.rxbuflock, flags);
 requeue:
 		rxbuf->in_process = false;
 		rxbuf->skb = NULL;
 		list_move_tail(&rxbuf->list, &priv->rx.rxbuf);
 		rxbuf = NULL;
 		spin_unlock_irqrestore(&priv->rx.rxbuflock, flags);
 	} while (1);

 }

 void ath9k_htc_rxep(void *drv_priv, struct sk_buff *skb,
 		    enum htc_endpoint_id ep_id)
 {
 	struct ath9k_htc_priv *priv = (struct ath9k_htc_priv *)drv_priv;
 	struct ath_hw *ah = priv->ah;
 	struct ath_common *common = ath9k_hw_common(ah);
 	struct ath9k_htc_rxbuf *rxbuf = NULL, *tmp_buf = NULL;

 	spin_lock(&priv->rx.rxbuflock);
 	list_for_each_entry(tmp_buf, &priv->rx.rxbuf, list) {
 		if (!tmp_buf->in_process) {
 			rxbuf = tmp_buf;
 			break;
 		}
 	}
 	spin_unlock(&priv->rx.rxbuflock);

 	if (rxbuf == NULL) {
 		ath_print(common, ATH_DBG_ANY,
 			  "No free RX buffer\n");
 		goto err;
 	}

 	spin_lock(&priv->rx.rxbuflock);
 	rxbuf->skb = skb;
 	rxbuf->in_process = true;
 	spin_unlock(&priv->rx.rxbuflock);

 	tasklet_schedule(&priv->rx_tasklet);
 	return;
 err:
 	dev_kfree_skb_any(skb);
 }

 /* FIXME: Locking for cleanup/init */

 void ath9k_rx_cleanup(struct ath9k_htc_priv *priv)
 {
 	struct ath9k_htc_rxbuf *rxbuf, *tbuf;

 	list_for_each_entry_safe(rxbuf, tbuf, &priv->rx.rxbuf, list) {
 		list_del(&rxbuf->list);
 		if (rxbuf->skb)
 			dev_kfree_skb_any(rxbuf->skb);
 		kfree(rxbuf);
 	}
 }

 int ath9k_rx_init(struct ath9k_htc_priv *priv)
 {
 	struct ath_hw *ah = priv->ah;
 	struct ath_common *common = ath9k_hw_common(ah);
 	struct ath9k_htc_rxbuf *rxbuf;
 	int i = 0;

 	INIT_LIST_HEAD(&priv->rx.rxbuf);
 	spin_lock_init(&priv->rx.rxbuflock);

 	for (i = 0; i < ATH9K_HTC_RXBUF; i++) {
 		rxbuf = kzalloc(sizeof(struct ath9k_htc_rxbuf), GFP_KERNEL);
 		if (rxbuf == NULL) {
 			ath_print(common, ATH_DBG_FATAL,
 				  "Unable to allocate RX buffers\n");
 			goto err;
 		}
 		list_add_tail(&rxbuf->list, &priv->rx.rxbuf);
 	}

 	return 0;

 err:
 	ath9k_rx_cleanup(priv);
 	return -ENOMEM;
 }
	/*
	* Copyright (c) 2010 Atheros Communications Inc.
	*
	* 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.
	*/

	#include "htc.h"

	/******/
	/* TX */
	/******/

	int get_hw_qnum(u16 queue, int *hwq_map)
	{
	switch (queue) {
	case 0:
	return hwq_map[ATH9K_WME_AC_VO];
	case 1:
	return hwq_map[ATH9K_WME_AC_VI];
	case 2:
	return hwq_map[ATH9K_WME_AC_BE];
	case 3:
	return hwq_map[ATH9K_WME_AC_BK];
	default:
	return hwq_map[ATH9K_WME_AC_BE];
	}
	}

	int ath_htc_txq_update(struct ath9k_htc_priv *priv, int qnum,
	struct ath9k_tx_queue_info *qinfo)
	{
	struct ath_hw *ah = priv->ah;
	int error = 0;
	struct ath9k_tx_queue_info qi;

	ath9k_hw_get_txq_props(ah, qnum, &qi);

	qi.tqi_aifs = qinfo->tqi_aifs;
	qi.tqi_cwmin = qinfo->tqi_cwmin / 2; /* XXX */
	qi.tqi_cwmax = qinfo->tqi_cwmax;
	qi.tqi_burstTime = qinfo->tqi_burstTime;
	qi.tqi_readyTime = qinfo->tqi_readyTime;

	if (!ath9k_hw_set_txq_props(ah, qnum, &qi)) {
	ath_print(ath9k_hw_common(ah), ATH_DBG_FATAL,
	"Unable to update hardware queue %u!\n", qnum);
	error = -EIO;
	} else {
	ath9k_hw_resettxqueue(ah, qnum);
	}

	return error;
	}

	int ath9k_htc_tx_start(struct ath9k_htc_priv priv, struct sk_buff skb)
	{
	struct ieee80211_hdr *hdr;
	struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
	struct ieee80211_sta *sta = tx_info->control.sta;
	struct ath9k_htc_sta *ista;
	struct ath9k_htc_vif *avp;
	struct ath9k_htc_tx_ctl tx_ctl;
	enum htc_endpoint_id epid;
	u16 qnum, hw_qnum;
	__le16 fc;
	u8 *tx_fhdr;
	u8 sta_idx;

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

	avp = (struct ath9k_htc_vif *) tx_info->control.vif->drv_priv;
	if (sta) {
	ista = (struct ath9k_htc_sta *) sta->drv_priv;
	sta_idx = ista->index;
	} else {
	sta_idx = 0;
	}

	memset(&tx_ctl, 0, sizeof(struct ath9k_htc_tx_ctl));

	if (ieee80211_is_data(fc)) {
	struct tx_frame_hdr tx_hdr;
	u8 *qc;

	memset(&tx_hdr, 0, sizeof(struct tx_frame_hdr));

	tx_hdr.node_idx = sta_idx;
	tx_hdr.vif_idx = avp->index;

	if (tx_info->flags & IEEE80211_TX_CTL_AMPDU) {
	tx_ctl.type = ATH9K_HTC_AMPDU;
	tx_hdr.data_type = ATH9K_HTC_AMPDU;
	} else {
	tx_ctl.type = ATH9K_HTC_NORMAL;
	tx_hdr.data_type = ATH9K_HTC_NORMAL;
	}

	if (ieee80211_is_data(fc)) {
	qc = ieee80211_get_qos_ctl(hdr);
	tx_hdr.tidno = qc[0] & IEEE80211_QOS_CTL_TID_MASK;
	}

	/* Check for RTS protection */
	if (priv->hw->wiphy->rts_threshold != (u32) -1)
	if (skb->len > priv->hw->wiphy->rts_threshold)
	tx_hdr.flags \|= ATH9K_HTC_TX_RTSCTS;

	/* CTS-to-self */
	if (!(tx_hdr.flags & ATH9K_HTC_TX_RTSCTS) &&
	(priv->op_flags & OP_PROTECT_ENABLE))
	tx_hdr.flags \|= ATH9K_HTC_TX_CTSONLY;

	tx_hdr.key_type = ath9k_cmn_get_hw_crypto_keytype(skb);
	if (tx_hdr.key_type == ATH9K_KEY_TYPE_CLEAR)
	tx_hdr.keyix = (u8) ATH9K_TXKEYIX_INVALID;
	else
	tx_hdr.keyix = tx_info->control.hw_key->hw_key_idx;

	tx_fhdr = skb_push(skb, sizeof(tx_hdr));
	memcpy(tx_fhdr, (u8 *) &tx_hdr, sizeof(tx_hdr));

	qnum = skb_get_queue_mapping(skb);
	hw_qnum = get_hw_qnum(qnum, priv->hwq_map);

	switch (hw_qnum) {
	case 0:
	epid = priv->data_be_ep;
	break;
	case 2:
	epid = priv->data_vi_ep;
	break;
	case 3:
	epid = priv->data_vo_ep;
	break;
	case 1:
	default:
	epid = priv->data_bk_ep;
	break;
	}
	} else {
	struct tx_mgmt_hdr mgmt_hdr;

	memset(&mgmt_hdr, 0, sizeof(struct tx_mgmt_hdr));

	tx_ctl.type = ATH9K_HTC_NORMAL;

	mgmt_hdr.node_idx = sta_idx;
	mgmt_hdr.vif_idx = avp->index;
	mgmt_hdr.tidno = 0;
	mgmt_hdr.flags = 0;

	mgmt_hdr.key_type = ath9k_cmn_get_hw_crypto_keytype(skb);
	if (mgmt_hdr.key_type == ATH9K_KEY_TYPE_CLEAR)
	mgmt_hdr.keyix = (u8) ATH9K_TXKEYIX_INVALID;
	else
	mgmt_hdr.keyix = tx_info->control.hw_key->hw_key_idx;

	tx_fhdr = skb_push(skb, sizeof(mgmt_hdr));
	memcpy(tx_fhdr, (u8 *) &mgmt_hdr, sizeof(mgmt_hdr));
	epid = priv->mgmt_ep;
	}

	return htc_send(priv->htc, skb, epid, &tx_ctl);
	}

	void ath9k_tx_tasklet(unsigned long data)
	{
	struct ath9k_htc_priv priv = (struct ath9k_htc_priv )data;
	struct ieee80211_sta *sta;
	struct ieee80211_hdr *hdr;
	struct ieee80211_tx_info *tx_info;
	struct sk_buff *skb = NULL;
	__le16 fc;

	while ((skb = skb_dequeue(&priv->tx_queue)) != NULL) {

	hdr = (struct ieee80211_hdr *) skb->data;
	fc = hdr->frame_control;
	tx_info = IEEE80211_SKB_CB(skb);

	memset(&tx_info->status, 0, sizeof(tx_info->status));

	rcu_read_lock();

	sta = ieee80211_find_sta(priv->vif, hdr->addr1);
	if (!sta) {
	rcu_read_unlock();
	ieee80211_tx_status(priv->hw, skb);
	continue;
	}

	/* Check if we need to start aggregation */

	if (sta && conf_is_ht(&priv->hw->conf) &&
	(priv->op_flags & OP_TXAGGR)
	&& !(skb->protocol == cpu_to_be16(ETH_P_PAE))) {
	if (ieee80211_is_data_qos(fc)) {
	u8 *qc, tid;
	struct ath9k_htc_sta *ista;

	qc = ieee80211_get_qos_ctl(hdr);
	tid = qc[0] & 0xf;
	ista = (struct ath9k_htc_sta *)sta->drv_priv;

	if ((tid < ATH9K_HTC_MAX_TID) &&
	ista->tid_state[tid] == AGGR_STOP) {
	ieee80211_start_tx_ba_session(sta, tid);
	ista->tid_state[tid] = AGGR_PROGRESS;
	}
	}
	}

	rcu_read_unlock();

	/* Send status to mac80211 */
	ieee80211_tx_status(priv->hw, skb);
	}

	/* Wake TX queues if needed */
	spin_lock_bh(&priv->tx_lock);
	if (priv->tx_queues_stop) {
	priv->tx_queues_stop = false;
	spin_unlock_bh(&priv->tx_lock);
	ath_print(ath9k_hw_common(priv->ah), ATH_DBG_XMIT,
	"Waking up TX queues\n");
	ieee80211_wake_queues(priv->hw);
	return;
	}
	spin_unlock_bh(&priv->tx_lock);
	}

	void ath9k_htc_txep(void drv_priv, struct sk_buff skb,
	enum htc_endpoint_id ep_id, bool txok)
	{
	struct ath9k_htc_priv priv = (struct ath9k_htc_priv ) drv_priv;
	struct ath_common *common = ath9k_hw_common(priv->ah);
	struct ieee80211_tx_info *tx_info;

	if (!skb)
	return;

	if (ep_id == priv->mgmt_ep) {
	skb_pull(skb, sizeof(struct tx_mgmt_hdr));
	} else if ((ep_id == priv->data_bk_ep) \|\|
	(ep_id == priv->data_be_ep) \|\|
	(ep_id == priv->data_vi_ep) \|\|
	(ep_id == priv->data_vo_ep)) {
	skb_pull(skb, sizeof(struct tx_frame_hdr));
	} else {
	ath_print(common, ATH_DBG_FATAL,
	"Unsupported TX EPID: %d\n", ep_id);
	dev_kfree_skb_any(skb);
	return;
	}

	tx_info = IEEE80211_SKB_CB(skb);

	if (txok)
	tx_info->flags \|= IEEE80211_TX_STAT_ACK;

	skb_queue_tail(&priv->tx_queue, skb);
	tasklet_schedule(&priv->tx_tasklet);
	}

	int ath9k_tx_init(struct ath9k_htc_priv *priv)
	{
	skb_queue_head_init(&priv->tx_queue);
	return 0;
	}

	void ath9k_tx_cleanup(struct ath9k_htc_priv *priv)
	{

	}

	bool ath9k_htc_txq_setup(struct ath9k_htc_priv *priv,
	enum ath9k_tx_queue_subtype subtype)
	{
	struct ath_hw *ah = priv->ah;
	struct ath_common *common = ath9k_hw_common(ah);
	struct ath9k_tx_queue_info qi;
	int qnum;

	memset(&qi, 0, sizeof(qi));

	qi.tqi_subtype = subtype;
	qi.tqi_aifs = ATH9K_TXQ_USEDEFAULT;
	qi.tqi_cwmin = ATH9K_TXQ_USEDEFAULT;
	qi.tqi_cwmax = ATH9K_TXQ_USEDEFAULT;
	qi.tqi_physCompBuf = 0;
	qi.tqi_qflags = TXQ_FLAG_TXEOLINT_ENABLE \| TXQ_FLAG_TXDESCINT_ENABLE;

	qnum = ath9k_hw_setuptxqueue(priv->ah, ATH9K_TX_QUEUE_DATA, &qi);
	if (qnum == -1)
	return false;

	if (qnum >= ARRAY_SIZE(priv->hwq_map)) {
	ath_print(common, ATH_DBG_FATAL,
	"qnum %u out of range, max %u!\n",
	qnum, (unsigned int)ARRAY_SIZE(priv->hwq_map));
	ath9k_hw_releasetxqueue(ah, qnum);
	return false;
	}

	priv->hwq_map[subtype] = qnum;
	return true;
	}

	/******/
	/* RX */
	/******/

	/*
	* Calculate the RX filter to be set in the HW.
	*/
	u32 ath9k_htc_calcrxfilter(struct ath9k_htc_priv *priv)
	{
	#define RX_FILTER_PRESERVE (ATH9K_RX_FILTER_PHYERR \| ATH9K_RX_FILTER_PHYRADAR)

	struct ath_hw *ah = priv->ah;
	u32 rfilt;

	rfilt = (ath9k_hw_getrxfilter(ah) & RX_FILTER_PRESERVE)
	\| ATH9K_RX_FILTER_UCAST \| ATH9K_RX_FILTER_BCAST
	\| ATH9K_RX_FILTER_MCAST;

	/* If not a STA, enable processing of Probe Requests */
	if (ah->opmode != NL80211_IFTYPE_STATION)
	rfilt \|= ATH9K_RX_FILTER_PROBEREQ;

	/*
	* Set promiscuous mode when FIF_PROMISC_IN_BSS is enabled for station
	* mode interface or when in monitor mode. AP mode does not need this
	* since it receives all in-BSS frames anyway.
	*/
	if (((ah->opmode != NL80211_IFTYPE_AP) &&
	(priv->rxfilter & FIF_PROMISC_IN_BSS)) \|\|
	(ah->opmode == NL80211_IFTYPE_MONITOR))
	rfilt \|= ATH9K_RX_FILTER_PROM;

	if (priv->rxfilter & FIF_CONTROL)
	rfilt \|= ATH9K_RX_FILTER_CONTROL;

	if ((ah->opmode == NL80211_IFTYPE_STATION) &&
	!(priv->rxfilter & FIF_BCN_PRBRESP_PROMISC))
	rfilt \|= ATH9K_RX_FILTER_MYBEACON;
	else
	rfilt \|= ATH9K_RX_FILTER_BEACON;

	if (conf_is_ht(&priv->hw->conf))
	rfilt \|= ATH9K_RX_FILTER_COMP_BAR;

	return rfilt;

	#undef RX_FILTER_PRESERVE
	}

	/*
	* Recv initialization for opmode change.
	*/
	static void ath9k_htc_opmode_init(struct ath9k_htc_priv *priv)
	{
	struct ath_hw *ah = priv->ah;
	struct ath_common *common = ath9k_hw_common(ah);

	u32 rfilt, mfilt[2];

	/* configure rx filter */
	rfilt = ath9k_htc_calcrxfilter(priv);
	ath9k_hw_setrxfilter(ah, rfilt);

	/* configure bssid mask */
	if (ah->caps.hw_caps & ATH9K_HW_CAP_BSSIDMASK)
	ath_hw_setbssidmask(common);

	/* configure operational mode */
	ath9k_hw_setopmode(ah);

	/* Handle any link-level address change. */
	ath9k_hw_setmac(ah, common->macaddr);

	/* calculate and install multicast filter */
	mfilt[0] = mfilt[1] = ~0;
	ath9k_hw_setmcastfilter(ah, mfilt[0], mfilt[1]);
	}

	void ath9k_host_rx_init(struct ath9k_htc_priv *priv)
	{
	ath9k_hw_rxena(priv->ah);
	ath9k_htc_opmode_init(priv);
	ath9k_hw_startpcureceive(priv->ah);
	priv->rx.last_rssi = ATH_RSSI_DUMMY_MARKER;
	}

	static void ath9k_process_rate(struct ieee80211_hw *hw,
	struct ieee80211_rx_status *rxs,
	u8 rx_rate, u8 rs_flags)
	{
	struct ieee80211_supported_band *sband;
	enum ieee80211_band band;
	unsigned int i = 0;

	if (rx_rate & 0x80) {
	/* HT rate */
	rxs->flag \|= RX_FLAG_HT;
	if (rs_flags & ATH9K_RX_2040)
	rxs->flag \|= RX_FLAG_40MHZ;
	if (rs_flags & ATH9K_RX_GI)
	rxs->flag \|= RX_FLAG_SHORT_GI;
	rxs->rate_idx = rx_rate & 0x7f;
	return;
	}

	band = hw->conf.channel->band;
	sband = hw->wiphy->bands[band];

	for (i = 0; i < sband->n_bitrates; i++) {
	if (sband->bitrates[i].hw_value == rx_rate) {
	rxs->rate_idx = i;
	return;
	}
	if (sband->bitrates[i].hw_value_short == rx_rate) {
	rxs->rate_idx = i;
	rxs->flag \|= RX_FLAG_SHORTPRE;
	return;
	}
	}

	}

	static bool ath9k_rx_prepare(struct ath9k_htc_priv *priv,
	struct ath9k_htc_rxbuf *rxbuf,
	struct ieee80211_rx_status *rx_status)

	{
	struct ieee80211_hdr *hdr;
	struct ieee80211_hw *hw = priv->hw;
	struct sk_buff *skb = rxbuf->skb;
	struct ath_common *common = ath9k_hw_common(priv->ah);
	struct ath_htc_rx_status *rxstatus;
	int hdrlen, padpos, padsize;
	int last_rssi = ATH_RSSI_DUMMY_MARKER;
	__le16 fc;

	if (skb->len <= HTC_RX_FRAME_HEADER_SIZE) {
	ath_print(common, ATH_DBG_FATAL,
	"Corrupted RX frame, dropping\n");
	goto rx_next;
	}

	rxstatus = (struct ath_htc_rx_status *)skb->data;

	if (be16_to_cpu(rxstatus->rs_datalen) -
	(skb->len - HTC_RX_FRAME_HEADER_SIZE) != 0) {
	ath_print(common, ATH_DBG_FATAL,
	"Corrupted RX data len, dropping "
	"(dlen: %d, skblen: %d)\n",
	rxstatus->rs_datalen, skb->len);
	goto rx_next;
	}

	/* Get the RX status information */
	memcpy(&rxbuf->rxstatus, rxstatus, HTC_RX_FRAME_HEADER_SIZE);
	skb_pull(skb, HTC_RX_FRAME_HEADER_SIZE);

	hdr = (struct ieee80211_hdr *)skb->data;
	fc = hdr->frame_control;
	hdrlen = ieee80211_get_hdrlen_from_skb(skb);

	padpos = ath9k_cmn_padpos(fc);

	padsize = padpos & 3;
	if (padsize && skb->len >= padpos+padsize+FCS_LEN) {
	memmove(skb->data + padsize, skb->data, padpos);
	skb_pull(skb, padsize);
	}

	memset(rx_status, 0, sizeof(struct ieee80211_rx_status));

	if (rxbuf->rxstatus.rs_status != 0) {
	if (rxbuf->rxstatus.rs_status & ATH9K_RXERR_CRC)
	rx_status->flag \|= RX_FLAG_FAILED_FCS_CRC;
	if (rxbuf->rxstatus.rs_status & ATH9K_RXERR_PHY)
	goto rx_next;

	if (rxbuf->rxstatus.rs_status & ATH9K_RXERR_DECRYPT) {
	/* FIXME */
	} else if (rxbuf->rxstatus.rs_status & ATH9K_RXERR_MIC) {
	if (ieee80211_is_ctl(fc))
	/*
	* Sometimes, we get invalid
	* MIC failures on valid control frames.
	* Remove these mic errors.
	*/
	rxbuf->rxstatus.rs_status &= ~ATH9K_RXERR_MIC;
	else
	rx_status->flag \|= RX_FLAG_MMIC_ERROR;
	}

	/*
	* Reject error frames with the exception of
	* decryption and MIC failures. For monitor mode,
	* we also ignore the CRC error.
	*/
	if (priv->ah->opmode == NL80211_IFTYPE_MONITOR) {
	if (rxbuf->rxstatus.rs_status &
	~(ATH9K_RXERR_DECRYPT \| ATH9K_RXERR_MIC \|
	ATH9K_RXERR_CRC))
	goto rx_next;
	} else {
	if (rxbuf->rxstatus.rs_status &
	~(ATH9K_RXERR_DECRYPT \| ATH9K_RXERR_MIC)) {
	goto rx_next;
	}
	}
	}

	if (!(rxbuf->rxstatus.rs_status & ATH9K_RXERR_DECRYPT)) {
	u8 keyix;
	keyix = rxbuf->rxstatus.rs_keyix;
	if (keyix != ATH9K_RXKEYIX_INVALID) {
	rx_status->flag \|= RX_FLAG_DECRYPTED;
	} else if (ieee80211_has_protected(fc) &&
	skb->len >= hdrlen + 4) {
	keyix = skb->data[hdrlen + 3] >> 6;
	if (test_bit(keyix, common->keymap))
	rx_status->flag \|= RX_FLAG_DECRYPTED;
	}
	}

	ath9k_process_rate(hw, rx_status, rxbuf->rxstatus.rs_rate,
	rxbuf->rxstatus.rs_flags);

	if (priv->op_flags & OP_ASSOCIATED) {
	if (rxbuf->rxstatus.rs_rssi != ATH9K_RSSI_BAD &&
	!rxbuf->rxstatus.rs_moreaggr)
	ATH_RSSI_LPF(priv->rx.last_rssi,
	rxbuf->rxstatus.rs_rssi);

	last_rssi = priv->rx.last_rssi;

	if (likely(last_rssi != ATH_RSSI_DUMMY_MARKER))
	rxbuf->rxstatus.rs_rssi = ATH_EP_RND(last_rssi,
	ATH_RSSI_EP_MULTIPLIER);

	if (rxbuf->rxstatus.rs_rssi < 0)
	rxbuf->rxstatus.rs_rssi = 0;

	if (ieee80211_is_beacon(fc))
	priv->ah->stats.avgbrssi = rxbuf->rxstatus.rs_rssi;
	}

	rx_status->mactime = be64_to_cpu(rxbuf->rxstatus.rs_tstamp);
	rx_status->band = hw->conf.channel->band;
	rx_status->freq = hw->conf.channel->center_freq;
	rx_status->signal = rxbuf->rxstatus.rs_rssi + ATH_DEFAULT_NOISE_FLOOR;
	rx_status->antenna = rxbuf->rxstatus.rs_antenna;
	rx_status->flag \|= RX_FLAG_TSFT;

	return true;

	rx_next:
	return false;
	}

	/*
	* FIXME: Handle FLUSH later on.
	*/
	void ath9k_rx_tasklet(unsigned long data)
	{
	struct ath9k_htc_priv priv = (struct ath9k_htc_priv )data;
	struct ath9k_htc_rxbuf rxbuf = NULL, tmp_buf = NULL;
	struct ieee80211_rx_status rx_status;
	struct sk_buff *skb;
	unsigned long flags;
	struct ieee80211_hdr *hdr;

	do {
	spin_lock_irqsave(&priv->rx.rxbuflock, flags);
	list_for_each_entry(tmp_buf, &priv->rx.rxbuf, list) {
	if (tmp_buf->in_process) {
	rxbuf = tmp_buf;
	break;
	}
	}

	if (rxbuf == NULL) {
	spin_unlock_irqrestore(&priv->rx.rxbuflock, flags);
	break;
	}

	if (!rxbuf->skb)
	goto requeue;

	if (!ath9k_rx_prepare(priv, rxbuf, &rx_status)) {
	dev_kfree_skb_any(rxbuf->skb);
	goto requeue;
	}

	memcpy(IEEE80211_SKB_RXCB(rxbuf->skb), &rx_status,
	sizeof(struct ieee80211_rx_status));
	skb = rxbuf->skb;
	hdr = (struct ieee80211_hdr *) skb->data;

	if (ieee80211_is_beacon(hdr->frame_control) && priv->ps_enabled)
	ieee80211_queue_work(priv->hw, &priv->ps_work);

	spin_unlock_irqrestore(&priv->rx.rxbuflock, flags);

	ieee80211_rx(priv->hw, skb);

	spin_lock_irqsave(&priv->rx.rxbuflock, flags);
	requeue:
	rxbuf->in_process = false;
	rxbuf->skb = NULL;
	list_move_tail(&rxbuf->list, &priv->rx.rxbuf);
	rxbuf = NULL;
	spin_unlock_irqrestore(&priv->rx.rxbuflock, flags);
	} while (1);

	}

	void ath9k_htc_rxep(void drv_priv, struct sk_buff skb,
	enum htc_endpoint_id ep_id)
	{
	struct ath9k_htc_priv priv = (struct ath9k_htc_priv )drv_priv;
	struct ath_hw *ah = priv->ah;
	struct ath_common *common = ath9k_hw_common(ah);
	struct ath9k_htc_rxbuf rxbuf = NULL, tmp_buf = NULL;

	spin_lock(&priv->rx.rxbuflock);
	list_for_each_entry(tmp_buf, &priv->rx.rxbuf, list) {
	if (!tmp_buf->in_process) {
	rxbuf = tmp_buf;
	break;
	}
	}
	spin_unlock(&priv->rx.rxbuflock);

	if (rxbuf == NULL) {
	ath_print(common, ATH_DBG_ANY,
	"No free RX buffer\n");
	goto err;
	}

	spin_lock(&priv->rx.rxbuflock);
	rxbuf->skb = skb;
	rxbuf->in_process = true;
	spin_unlock(&priv->rx.rxbuflock);

	tasklet_schedule(&priv->rx_tasklet);
	return;
	err:
	dev_kfree_skb_any(skb);
	}

	/* FIXME: Locking for cleanup/init */

	void ath9k_rx_cleanup(struct ath9k_htc_priv *priv)
	{
	struct ath9k_htc_rxbuf rxbuf, tbuf;

	list_for_each_entry_safe(rxbuf, tbuf, &priv->rx.rxbuf, list) {
	list_del(&rxbuf->list);
	if (rxbuf->skb)
	dev_kfree_skb_any(rxbuf->skb);
	kfree(rxbuf);
	}
	}

	int ath9k_rx_init(struct ath9k_htc_priv *priv)
	{
	struct ath_hw *ah = priv->ah;
	struct ath_common *common = ath9k_hw_common(ah);
	struct ath9k_htc_rxbuf *rxbuf;
	int i = 0;

	INIT_LIST_HEAD(&priv->rx.rxbuf);
	spin_lock_init(&priv->rx.rxbuflock);

	for (i = 0; i < ATH9K_HTC_RXBUF; i++) {
	rxbuf = kzalloc(sizeof(struct ath9k_htc_rxbuf), GFP_KERNEL);
	if (rxbuf == NULL) {
	ath_print(common, ATH_DBG_FATAL,
	"Unable to allocate RX buffers\n");
	goto err;
	}
	list_add_tail(&rxbuf->list, &priv->rx.rxbuf);
	}

	return 0;

	err:
	ath9k_rx_cleanup(priv);
	return -ENOMEM;
	}