[net-next-2.6.git] / drivers / net / wireless / ath / ath9k / htc_drv_txrx.c

/*
 * 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;
}
Commit	Line	Data
fb9987d0 S	1	/*
	2	* Copyright (c) 2010 Atheros Communications Inc.
	3	*
	4	* Permission to use, copy, modify, and/or distribute this software for any
	5	* purpose with or without fee is hereby granted, provided that the above
	6	* copyright notice and this permission notice appear in all copies.
	7	*
	8	* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
	9	* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
	10	* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
	11	* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
	12	* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
	13	* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
	14	* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
	15	*/
	16
	17	#include "htc.h"
	18
	19	/******/
	20	/* TX */
	21	/******/
	22
	23	int get_hw_qnum(u16 queue, int *hwq_map)
	24	{
	25	switch (queue) {
	26	case 0:
	27	return hwq_map[ATH9K_WME_AC_VO];
	28	case 1:
	29	return hwq_map[ATH9K_WME_AC_VI];
	30	case 2:
	31	return hwq_map[ATH9K_WME_AC_BE];
	32	case 3:
	33	return hwq_map[ATH9K_WME_AC_BK];
	34	default:
	35	return hwq_map[ATH9K_WME_AC_BE];
	36	}
	37	}
	38
e1572c5e S	39	int ath_htc_txq_update(struct ath9k_htc_priv *priv, int qnum,
e1572c5e S	40	struct ath9k_tx_queue_info *qinfo)
fb9987d0 S	41	{
	42	struct ath_hw *ah = priv->ah;
	43	int error = 0;
	44	struct ath9k_tx_queue_info qi;
	45
	46	ath9k_hw_get_txq_props(ah, qnum, &qi);
	47
	48	qi.tqi_aifs = qinfo->tqi_aifs;
	49	qi.tqi_cwmin = qinfo->tqi_cwmin / 2; /* XXX */
	50	qi.tqi_cwmax = qinfo->tqi_cwmax;
	51	qi.tqi_burstTime = qinfo->tqi_burstTime;
	52	qi.tqi_readyTime = qinfo->tqi_readyTime;
	53
	54	if (!ath9k_hw_set_txq_props(ah, qnum, &qi)) {
	55	ath_print(ath9k_hw_common(ah), ATH_DBG_FATAL,
	56	"Unable to update hardware queue %u!\n", qnum);
	57	error = -EIO;
	58	} else {
	59	ath9k_hw_resettxqueue(ah, qnum);
	60	}
	61
	62	return error;
	63	}
	64
	65	int ath9k_htc_tx_start(struct ath9k_htc_priv priv, struct sk_buff skb)
	66	{
	67	struct ieee80211_hdr *hdr;
	68	struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
	69	struct ieee80211_sta *sta = tx_info->control.sta;
	70	struct ath9k_htc_sta *ista;
	71	struct ath9k_htc_vif *avp;
	72	struct ath9k_htc_tx_ctl tx_ctl;
	73	enum htc_endpoint_id epid;
	74	u16 qnum, hw_qnum;
	75	__le16 fc;
	76	u8 *tx_fhdr;
	77	u8 sta_idx;
	78
	79	hdr = (struct ieee80211_hdr *) skb->data;
	80	fc = hdr->frame_control;
	81
	82	avp = (struct ath9k_htc_vif *) tx_info->control.vif->drv_priv;
	83	if (sta) {
	84	ista = (struct ath9k_htc_sta *) sta->drv_priv;
	85	sta_idx = ista->index;
	86	} else {
	87	sta_idx = 0;
	88	}
	89
	90	memset(&tx_ctl, 0, sizeof(struct ath9k_htc_tx_ctl));
	91
	92	if (ieee80211_is_data(fc)) {
	93	struct tx_frame_hdr tx_hdr;
	94	u8 *qc;
	95
	96	memset(&tx_hdr, 0, sizeof(struct tx_frame_hdr));
	97
	98	tx_hdr.node_idx = sta_idx;
	99	tx_hdr.vif_idx = avp->index;
	100
	101	if (tx_info->flags & IEEE80211_TX_CTL_AMPDU) {
	102	tx_ctl.type = ATH9K_HTC_AMPDU;
	103	tx_hdr.data_type = ATH9K_HTC_AMPDU;
	104	} else {
105	tx_ctl.type = ATH9K_HTC_NORMAL;
106	tx_hdr.data_type = ATH9K_HTC_NORMAL;
107	}
108
109	if (ieee80211_is_data(fc)) {
110	qc = ieee80211_get_qos_ctl(hdr);
111	tx_hdr.tidno = qc[0] & IEEE80211_QOS_CTL_TID_MASK;
112	}
113
114	/* Check for RTS protection */
115	if (priv->hw->wiphy->rts_threshold != (u32) -1)
116	if (skb->len > priv->hw->wiphy->rts_threshold)
117	tx_hdr.flags \|= ATH9K_HTC_TX_RTSCTS;
118
119	/* CTS-to-self */
120	if (!(tx_hdr.flags & ATH9K_HTC_TX_RTSCTS) &&
121	(priv->op_flags & OP_PROTECT_ENABLE))
122	tx_hdr.flags \|= ATH9K_HTC_TX_CTSONLY;
123
124	tx_hdr.key_type = ath9k_cmn_get_hw_crypto_keytype(skb);
125	if (tx_hdr.key_type == ATH9K_KEY_TYPE_CLEAR)
126	tx_hdr.keyix = (u8) ATH9K_TXKEYIX_INVALID;
127	else
128	tx_hdr.keyix = tx_info->control.hw_key->hw_key_idx;
129
130	tx_fhdr = skb_push(skb, sizeof(tx_hdr));
131	memcpy(tx_fhdr, (u8 *) &tx_hdr, sizeof(tx_hdr));
132
133	qnum = skb_get_queue_mapping(skb);
134	hw_qnum = get_hw_qnum(qnum, priv->hwq_map);
135
136	switch (hw_qnum) {
137	case 0:
138	epid = priv->data_be_ep;
139	break;
140	case 2:
141	epid = priv->data_vi_ep;
142	break;
143	case 3:
144	epid = priv->data_vo_ep;
145	break;
146	case 1:
147	default:
148	epid = priv->data_bk_ep;
149	break;
150	}
151	} else {
152	struct tx_mgmt_hdr mgmt_hdr;
153
154	memset(&mgmt_hdr, 0, sizeof(struct tx_mgmt_hdr));
155
156	tx_ctl.type = ATH9K_HTC_NORMAL;
157
158	mgmt_hdr.node_idx = sta_idx;
159	mgmt_hdr.vif_idx = avp->index;
160	mgmt_hdr.tidno = 0;
161	mgmt_hdr.flags = 0;
162
163	mgmt_hdr.key_type = ath9k_cmn_get_hw_crypto_keytype(skb);
164	if (mgmt_hdr.key_type == ATH9K_KEY_TYPE_CLEAR)
165	mgmt_hdr.keyix = (u8) ATH9K_TXKEYIX_INVALID;
166	else
167	mgmt_hdr.keyix = tx_info->control.hw_key->hw_key_idx;
168
169	tx_fhdr = skb_push(skb, sizeof(mgmt_hdr));
170	memcpy(tx_fhdr, (u8 *) &mgmt_hdr, sizeof(mgmt_hdr));
171	epid = priv->mgmt_ep;
172	}
173
174	return htc_send(priv->htc, skb, epid, &tx_ctl);
175	}
176
177	void ath9k_tx_tasklet(unsigned long data)
178	{
179	struct ath9k_htc_priv priv = (struct ath9k_htc_priv )data;
180	struct ieee80211_sta *sta;
181	struct ieee80211_hdr *hdr;
182	struct ieee80211_tx_info *tx_info;
183	struct sk_buff *skb = NULL;
184	__le16 fc;
185
186	while ((skb = skb_dequeue(&priv->tx_queue)) != NULL) {
187
188	hdr = (struct ieee80211_hdr *) skb->data;
189	fc = hdr->frame_control;
190	tx_info = IEEE80211_SKB_CB(skb);
ef98c3cd S	191
ef98c3cd S	192	memset(&tx_info->status, 0, sizeof(tx_info->status));
fb9987d0 S	193
	194	rcu_read_lock();
	195
ef98c3cd S	196	sta = ieee80211_find_sta(priv->vif, hdr->addr1);
	197	if (!sta) {
	198	rcu_read_unlock();
	199	ieee80211_tx_status(priv->hw, skb);
	200	continue;
	201	}
	202
	203	/* Check if we need to start aggregation */
	204
fb9987d0 S	205	if (sta && conf_is_ht(&priv->hw->conf) &&
	206	(priv->op_flags & OP_TXAGGR)
	207	&& !(skb->protocol == cpu_to_be16(ETH_P_PAE))) {
	208	if (ieee80211_is_data_qos(fc)) {
	209	u8 *qc, tid;
	210	struct ath9k_htc_sta *ista;
	211
	212	qc = ieee80211_get_qos_ctl(hdr);
	213	tid = qc[0] & 0xf;
	214	ista = (struct ath9k_htc_sta *)sta->drv_priv;
	215
	216	if ((tid < ATH9K_HTC_MAX_TID) &&
	217	ista->tid_state[tid] == AGGR_STOP) {
	218	ieee80211_start_tx_ba_session(sta, tid);
	219	ista->tid_state[tid] = AGGR_PROGRESS;
	220	}
	221	}
	222	}
	223
	224	rcu_read_unlock();
	225
ef98c3cd	226	/* Send status to mac80211 */
fb9987d0 S	227	ieee80211_tx_status(priv->hw, skb);
fb9987d0 S	228	}
7757dfed S	229
	230	/* Wake TX queues if needed */
	231	spin_lock_bh(&priv->tx_lock);
	232	if (priv->tx_queues_stop) {
	233	priv->tx_queues_stop = false;
	234	spin_unlock_bh(&priv->tx_lock);
	235	ath_print(ath9k_hw_common(priv->ah), ATH_DBG_XMIT,
	236	"Waking up TX queues\n");
	237	ieee80211_wake_queues(priv->hw);
	238	return;
	239	}
	240	spin_unlock_bh(&priv->tx_lock);
fb9987d0 S	241	}
	242
	243	void ath9k_htc_txep(void drv_priv, struct sk_buff skb,
	244	enum htc_endpoint_id ep_id, bool txok)
	245	{
	246	struct ath9k_htc_priv priv = (struct ath9k_htc_priv ) drv_priv;
d439260e	247	struct ath_common *common = ath9k_hw_common(priv->ah);
fb9987d0 S	248	struct ieee80211_tx_info *tx_info;
	249
	250	if (!skb)
	251	return;
	252
d439260e	253	if (ep_id == priv->mgmt_ep) {
fb9987d0	254	skb_pull(skb, sizeof(struct tx_mgmt_hdr));
d439260e S	255	} else if ((ep_id == priv->data_bk_ep) \|\|
	256	(ep_id == priv->data_be_ep) \|\|
	257	(ep_id == priv->data_vi_ep) \|\|
	258	(ep_id == priv->data_vo_ep)) {
fb9987d0	259	skb_pull(skb, sizeof(struct tx_frame_hdr));
d439260e S	260	} else {
	261	ath_print(common, ATH_DBG_FATAL,
	262	"Unsupported TX EPID: %d\n", ep_id);
	263	dev_kfree_skb_any(skb);
	264	return;
	265	}
fb9987d0 S	266
	267	tx_info = IEEE80211_SKB_CB(skb);
	268
	269	if (txok)
	270	tx_info->flags \|= IEEE80211_TX_STAT_ACK;
	271
	272	skb_queue_tail(&priv->tx_queue, skb);
	273	tasklet_schedule(&priv->tx_tasklet);
	274	}
	275
	276	int ath9k_tx_init(struct ath9k_htc_priv *priv)
	277	{
	278	skb_queue_head_init(&priv->tx_queue);
	279	return 0;
	280	}
	281
	282	void ath9k_tx_cleanup(struct ath9k_htc_priv *priv)
	283	{
	284
	285	}
	286
	287	bool ath9k_htc_txq_setup(struct ath9k_htc_priv *priv,
	288	enum ath9k_tx_queue_subtype subtype)
	289	{
	290	struct ath_hw *ah = priv->ah;
	291	struct ath_common *common = ath9k_hw_common(ah);
	292	struct ath9k_tx_queue_info qi;
	293	int qnum;
	294
	295	memset(&qi, 0, sizeof(qi));
	296
	297	qi.tqi_subtype = subtype;
	298	qi.tqi_aifs = ATH9K_TXQ_USEDEFAULT;
	299	qi.tqi_cwmin = ATH9K_TXQ_USEDEFAULT;
	300	qi.tqi_cwmax = ATH9K_TXQ_USEDEFAULT;
	301	qi.tqi_physCompBuf = 0;
	302	qi.tqi_qflags = TXQ_FLAG_TXEOLINT_ENABLE \| TXQ_FLAG_TXDESCINT_ENABLE;
	303
	304	qnum = ath9k_hw_setuptxqueue(priv->ah, ATH9K_TX_QUEUE_DATA, &qi);
	305	if (qnum == -1)
	306	return false;
	307
	308	if (qnum >= ARRAY_SIZE(priv->hwq_map)) {
	309	ath_print(common, ATH_DBG_FATAL,
	310	"qnum %u out of range, max %u!\n",
	311	qnum, (unsigned int)ARRAY_SIZE(priv->hwq_map));
	312	ath9k_hw_releasetxqueue(ah, qnum);
	313	return false;
	314	}
	315
	316	priv->hwq_map[subtype] = qnum;
	317	return true;
	318	}
	319
	320	/******/
	321	/* RX */
	322	/******/
	323
0995d110 S	324	/*
	325	* Calculate the RX filter to be set in the HW.
	326	*/
	327	u32 ath9k_htc_calcrxfilter(struct ath9k_htc_priv *priv)
	328	{
	329	#define RX_FILTER_PRESERVE (ATH9K_RX_FILTER_PHYERR \| ATH9K_RX_FILTER_PHYRADAR)
	330
	331	struct ath_hw *ah = priv->ah;
	332	u32 rfilt;
	333
	334	rfilt = (ath9k_hw_getrxfilter(ah) & RX_FILTER_PRESERVE)
	335	\| ATH9K_RX_FILTER_UCAST \| ATH9K_RX_FILTER_BCAST
	336	\| ATH9K_RX_FILTER_MCAST;
	337
	338	/* If not a STA, enable processing of Probe Requests */
	339	if (ah->opmode != NL80211_IFTYPE_STATION)
	340	rfilt \|= ATH9K_RX_FILTER_PROBEREQ;
	341
	342	/*
	343	* Set promiscuous mode when FIF_PROMISC_IN_BSS is enabled for station
	344	* mode interface or when in monitor mode. AP mode does not need this
	345	* since it receives all in-BSS frames anyway.
	346	*/
	347	if (((ah->opmode != NL80211_IFTYPE_AP) &&
	348	(priv->rxfilter & FIF_PROMISC_IN_BSS)) \|\|
	349	(ah->opmode == NL80211_IFTYPE_MONITOR))
	350	rfilt \|= ATH9K_RX_FILTER_PROM;
	351
	352	if (priv->rxfilter & FIF_CONTROL)
	353	rfilt \|= ATH9K_RX_FILTER_CONTROL;
	354
	355	if ((ah->opmode == NL80211_IFTYPE_STATION) &&
	356	!(priv->rxfilter & FIF_BCN_PRBRESP_PROMISC))
	357	rfilt \|= ATH9K_RX_FILTER_MYBEACON;
	358	else
	359	rfilt \|= ATH9K_RX_FILTER_BEACON;
	360
	361	if (conf_is_ht(&priv->hw->conf))
	362	rfilt \|= ATH9K_RX_FILTER_COMP_BAR;
	363
	364	return rfilt;
	365
	366	#undef RX_FILTER_PRESERVE
	367	}
	368
	369	/*
	370	* Recv initialization for opmode change.
	371	*/
	372	static void ath9k_htc_opmode_init(struct ath9k_htc_priv *priv)
	373	{
	374	struct ath_hw *ah = priv->ah;
	375	struct ath_common *common = ath9k_hw_common(ah);
	376
	377	u32 rfilt, mfilt[2];
	378
	379	/* configure rx filter */
	380	rfilt = ath9k_htc_calcrxfilter(priv);
	381	ath9k_hw_setrxfilter(ah, rfilt);
	382
	383	/* configure bssid mask */
	384	if (ah->caps.hw_caps & ATH9K_HW_CAP_BSSIDMASK)
	385	ath_hw_setbssidmask(common);
	386
	387	/* configure operational mode */
388	ath9k_hw_setopmode(ah);
389
390	/* Handle any link-level address change. */
391	ath9k_hw_setmac(ah, common->macaddr);
392
393	/* calculate and install multicast filter */
394	mfilt[0] = mfilt[1] = ~0;
395	ath9k_hw_setmcastfilter(ah, mfilt[0], mfilt[1]);
396	}
397
fb9987d0 S	398	void ath9k_host_rx_init(struct ath9k_htc_priv *priv)
	399	{
	400	ath9k_hw_rxena(priv->ah);
0995d110	401	ath9k_htc_opmode_init(priv);
fb9987d0 S	402	ath9k_hw_startpcureceive(priv->ah);
	403	priv->rx.last_rssi = ATH_RSSI_DUMMY_MARKER;
	404	}
	405
	406	static void ath9k_process_rate(struct ieee80211_hw *hw,
	407	struct ieee80211_rx_status *rxs,
	408	u8 rx_rate, u8 rs_flags)
	409	{
	410	struct ieee80211_supported_band *sband;
	411	enum ieee80211_band band;
	412	unsigned int i = 0;
	413
	414	if (rx_rate & 0x80) {
	415	/* HT rate */
	416	rxs->flag \|= RX_FLAG_HT;
	417	if (rs_flags & ATH9K_RX_2040)
	418	rxs->flag \|= RX_FLAG_40MHZ;
	419	if (rs_flags & ATH9K_RX_GI)
	420	rxs->flag \|= RX_FLAG_SHORT_GI;
	421	rxs->rate_idx = rx_rate & 0x7f;
	422	return;
	423	}
	424
	425	band = hw->conf.channel->band;
	426	sband = hw->wiphy->bands[band];
	427
	428	for (i = 0; i < sband->n_bitrates; i++) {
	429	if (sband->bitrates[i].hw_value == rx_rate) {
	430	rxs->rate_idx = i;
	431	return;
	432	}
	433	if (sband->bitrates[i].hw_value_short == rx_rate) {
	434	rxs->rate_idx = i;
	435	rxs->flag \|= RX_FLAG_SHORTPRE;
	436	return;
	437	}
	438	}
	439
	440	}
	441
	442	static bool ath9k_rx_prepare(struct ath9k_htc_priv *priv,
	443	struct ath9k_htc_rxbuf *rxbuf,
	444	struct ieee80211_rx_status *rx_status)
	445
	446	{
	447	struct ieee80211_hdr *hdr;
	448	struct ieee80211_hw *hw = priv->hw;
	449	struct sk_buff *skb = rxbuf->skb;
	450	struct ath_common *common = ath9k_hw_common(priv->ah);
4f824719	451	struct ath_htc_rx_status *rxstatus;
fb9987d0 S	452	int hdrlen, padpos, padsize;
	453	int last_rssi = ATH_RSSI_DUMMY_MARKER;
	454	__le16 fc;
	455
4f824719 S	456	if (skb->len <= HTC_RX_FRAME_HEADER_SIZE) {
	457	ath_print(common, ATH_DBG_FATAL,
	458	"Corrupted RX frame, dropping\n");
	459	goto rx_next;
	460	}
	461
	462	rxstatus = (struct ath_htc_rx_status *)skb->data;
	463
	464	if (be16_to_cpu(rxstatus->rs_datalen) -
	465	(skb->len - HTC_RX_FRAME_HEADER_SIZE) != 0) {
	466	ath_print(common, ATH_DBG_FATAL,
	467	"Corrupted RX data len, dropping "
	468	"(dlen: %d, skblen: %d)\n",
	469	rxstatus->rs_datalen, skb->len);
	470	goto rx_next;
	471	}
	472
	473	/* Get the RX status information */
	474	memcpy(&rxbuf->rxstatus, rxstatus, HTC_RX_FRAME_HEADER_SIZE);
	475	skb_pull(skb, HTC_RX_FRAME_HEADER_SIZE);
	476
fb9987d0 S	477	hdr = (struct ieee80211_hdr *)skb->data;
	478	fc = hdr->frame_control;
	479	hdrlen = ieee80211_get_hdrlen_from_skb(skb);
	480
	481	padpos = ath9k_cmn_padpos(fc);
	482
	483	padsize = padpos & 3;
32fbccaf	484	if (padsize && skb->len >= padpos+padsize+FCS_LEN) {
fb9987d0 S	485	memmove(skb->data + padsize, skb->data, padpos);
	486	skb_pull(skb, padsize);
	487	}
	488
	489	memset(rx_status, 0, sizeof(struct ieee80211_rx_status));
	490
	491	if (rxbuf->rxstatus.rs_status != 0) {
	492	if (rxbuf->rxstatus.rs_status & ATH9K_RXERR_CRC)
	493	rx_status->flag \|= RX_FLAG_FAILED_FCS_CRC;
	494	if (rxbuf->rxstatus.rs_status & ATH9K_RXERR_PHY)
	495	goto rx_next;
	496
	497	if (rxbuf->rxstatus.rs_status & ATH9K_RXERR_DECRYPT) {
	498	/* FIXME */
	499	} else if (rxbuf->rxstatus.rs_status & ATH9K_RXERR_MIC) {
	500	if (ieee80211_is_ctl(fc))
	501	/*
	502	* Sometimes, we get invalid
	503	* MIC failures on valid control frames.
	504	* Remove these mic errors.
	505	*/
	506	rxbuf->rxstatus.rs_status &= ~ATH9K_RXERR_MIC;
	507	else
	508	rx_status->flag \|= RX_FLAG_MMIC_ERROR;
	509	}
	510
	511	/*
	512	* Reject error frames with the exception of
	513	* decryption and MIC failures. For monitor mode,
	514	* we also ignore the CRC error.
	515	*/
	516	if (priv->ah->opmode == NL80211_IFTYPE_MONITOR) {
	517	if (rxbuf->rxstatus.rs_status &
	518	~(ATH9K_RXERR_DECRYPT \| ATH9K_RXERR_MIC \|
	519	ATH9K_RXERR_CRC))
	520	goto rx_next;
	521	} else {
	522	if (rxbuf->rxstatus.rs_status &
	523	~(ATH9K_RXERR_DECRYPT \| ATH9K_RXERR_MIC)) {
	524	goto rx_next;
	525	}
	526	}
	527	}
	528
	529	if (!(rxbuf->rxstatus.rs_status & ATH9K_RXERR_DECRYPT)) {
	530	u8 keyix;
	531	keyix = rxbuf->rxstatus.rs_keyix;
	532	if (keyix != ATH9K_RXKEYIX_INVALID) {
	533	rx_status->flag \|= RX_FLAG_DECRYPTED;
	534	} else if (ieee80211_has_protected(fc) &&
	535	skb->len >= hdrlen + 4) {
	536	keyix = skb->data[hdrlen + 3] >> 6;
	537	if (test_bit(keyix, common->keymap))
	538	rx_status->flag \|= RX_FLAG_DECRYPTED;
	539	}
	540	}
	541
	542	ath9k_process_rate(hw, rx_status, rxbuf->rxstatus.rs_rate,
	543	rxbuf->rxstatus.rs_flags);
	544
	545	if (priv->op_flags & OP_ASSOCIATED) {
	546	if (rxbuf->rxstatus.rs_rssi != ATH9K_RSSI_BAD &&
	547	!rxbuf->rxstatus.rs_moreaggr)
	548	ATH_RSSI_LPF(priv->rx.last_rssi,
549	rxbuf->rxstatus.rs_rssi);
550
551	last_rssi = priv->rx.last_rssi;
552
553	if (likely(last_rssi != ATH_RSSI_DUMMY_MARKER))
554	rxbuf->rxstatus.rs_rssi = ATH_EP_RND(last_rssi,
555	ATH_RSSI_EP_MULTIPLIER);
556
557	if (rxbuf->rxstatus.rs_rssi < 0)
558	rxbuf->rxstatus.rs_rssi = 0;
559
560	if (ieee80211_is_beacon(fc))
561	priv->ah->stats.avgbrssi = rxbuf->rxstatus.rs_rssi;
562	}
563
7f1f5a00	564	rx_status->mactime = be64_to_cpu(rxbuf->rxstatus.rs_tstamp);
fb9987d0 S	565	rx_status->band = hw->conf.channel->band;
	566	rx_status->freq = hw->conf.channel->center_freq;
	567	rx_status->signal = rxbuf->rxstatus.rs_rssi + ATH_DEFAULT_NOISE_FLOOR;
	568	rx_status->antenna = rxbuf->rxstatus.rs_antenna;
	569	rx_status->flag \|= RX_FLAG_TSFT;
	570
	571	return true;
	572
	573	rx_next:
	574	return false;
	575	}
	576
	577	/*
	578	* FIXME: Handle FLUSH later on.
	579	*/
	580	void ath9k_rx_tasklet(unsigned long data)
	581	{
	582	struct ath9k_htc_priv priv = (struct ath9k_htc_priv )data;
	583	struct ath9k_htc_rxbuf rxbuf = NULL, tmp_buf = NULL;
	584	struct ieee80211_rx_status rx_status;
	585	struct sk_buff *skb;
	586	unsigned long flags;
bde748a4	587	struct ieee80211_hdr *hdr;
fb9987d0 S	588
	589	do {
	590	spin_lock_irqsave(&priv->rx.rxbuflock, flags);
	591	list_for_each_entry(tmp_buf, &priv->rx.rxbuf, list) {
	592	if (tmp_buf->in_process) {
	593	rxbuf = tmp_buf;
	594	break;
	595	}
	596	}
	597
	598	if (rxbuf == NULL) {
	599	spin_unlock_irqrestore(&priv->rx.rxbuflock, flags);
	600	break;
	601	}
	602
	603	if (!rxbuf->skb)
	604	goto requeue;
	605
	606	if (!ath9k_rx_prepare(priv, rxbuf, &rx_status)) {
	607	dev_kfree_skb_any(rxbuf->skb);
	608	goto requeue;
	609	}
	610
	611	memcpy(IEEE80211_SKB_RXCB(rxbuf->skb), &rx_status,
	612	sizeof(struct ieee80211_rx_status));
	613	skb = rxbuf->skb;
bde748a4 VN	614	hdr = (struct ieee80211_hdr *) skb->data;
	615
	616	if (ieee80211_is_beacon(hdr->frame_control) && priv->ps_enabled)
	617	ieee80211_queue_work(priv->hw, &priv->ps_work);
	618
fb9987d0 S	619	spin_unlock_irqrestore(&priv->rx.rxbuflock, flags);
	620
	621	ieee80211_rx(priv->hw, skb);
	622
	623	spin_lock_irqsave(&priv->rx.rxbuflock, flags);
	624	requeue:
	625	rxbuf->in_process = false;
	626	rxbuf->skb = NULL;
	627	list_move_tail(&rxbuf->list, &priv->rx.rxbuf);
	628	rxbuf = NULL;
	629	spin_unlock_irqrestore(&priv->rx.rxbuflock, flags);
	630	} while (1);
	631
	632	}
	633
	634	void ath9k_htc_rxep(void drv_priv, struct sk_buff skb,
	635	enum htc_endpoint_id ep_id)
	636	{
	637	struct ath9k_htc_priv priv = (struct ath9k_htc_priv )drv_priv;
	638	struct ath_hw *ah = priv->ah;
	639	struct ath_common *common = ath9k_hw_common(ah);
	640	struct ath9k_htc_rxbuf rxbuf = NULL, tmp_buf = NULL;
fb9987d0 S	641
	642	spin_lock(&priv->rx.rxbuflock);
	643	list_for_each_entry(tmp_buf, &priv->rx.rxbuf, list) {
	644	if (!tmp_buf->in_process) {
	645	rxbuf = tmp_buf;
	646	break;
	647	}
	648	}
	649	spin_unlock(&priv->rx.rxbuflock);
	650
	651	if (rxbuf == NULL) {
	652	ath_print(common, ATH_DBG_ANY,
	653	"No free RX buffer\n");
	654	goto err;
	655	}
	656
fb9987d0	657	spin_lock(&priv->rx.rxbuflock);
fb9987d0 S	658	rxbuf->skb = skb;
	659	rxbuf->in_process = true;
	660	spin_unlock(&priv->rx.rxbuflock);
	661
	662	tasklet_schedule(&priv->rx_tasklet);
	663	return;
	664	err:
	665	dev_kfree_skb_any(skb);
fb9987d0 S	666	}
	667
	668	/* FIXME: Locking for cleanup/init */
	669
	670	void ath9k_rx_cleanup(struct ath9k_htc_priv *priv)
	671	{
	672	struct ath9k_htc_rxbuf rxbuf, tbuf;
	673
	674	list_for_each_entry_safe(rxbuf, tbuf, &priv->rx.rxbuf, list) {
	675	list_del(&rxbuf->list);
	676	if (rxbuf->skb)
	677	dev_kfree_skb_any(rxbuf->skb);
	678	kfree(rxbuf);
	679	}
	680	}
	681
	682	int ath9k_rx_init(struct ath9k_htc_priv *priv)
	683	{
	684	struct ath_hw *ah = priv->ah;
	685	struct ath_common *common = ath9k_hw_common(ah);
	686	struct ath9k_htc_rxbuf *rxbuf;
	687	int i = 0;
	688
	689	INIT_LIST_HEAD(&priv->rx.rxbuf);
	690	spin_lock_init(&priv->rx.rxbuflock);
	691
	692	for (i = 0; i < ATH9K_HTC_RXBUF; i++) {
	693	rxbuf = kzalloc(sizeof(struct ath9k_htc_rxbuf), GFP_KERNEL);
	694	if (rxbuf == NULL) {
	695	ath_print(common, ATH_DBG_FATAL,
	696	"Unable to allocate RX buffers\n");
	697	goto err;
	698	}
	699	list_add_tail(&rxbuf->list, &priv->rx.rxbuf);
	700	}
	701
	702	return 0;
	703
	704	err:
	705	ath9k_rx_cleanup(priv);
	706	return -ENOMEM;
	707	}