drivers/net/wireless/ath9k/main.c



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/*
 * Copyright (c) 2008 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.
 */

/* mac80211 and PCI callbacks */

#include <linux/nl80211.h>
#include "core.h"

#define ATH_PCI_VERSION "0.1"

#define IEEE80211_HTCAP_MAXRXAMPDU_FACTOR	13
#define IEEE80211_ACTION_CAT_HT			7
#define IEEE80211_ACTION_HT_TXCHWIDTH		0

static char *dev_info = "ath9k";

MODULE_AUTHOR("Atheros Communications");
MODULE_DESCRIPTION("Support for Atheros 802.11n wireless LAN cards.");
MODULE_SUPPORTED_DEVICE("Atheros 802.11n WLAN cards");
MODULE_LICENSE("Dual BSD/GPL");

static struct pci_device_id ath_pci_id_table[] __devinitdata = {
	{ PCI_VDEVICE(ATHEROS, 0x0023) }, /* PCI   */
	{ PCI_VDEVICE(ATHEROS, 0x0024) }, /* PCI-E */
	{ PCI_VDEVICE(ATHEROS, 0x0027) }, /* PCI   */
	{ PCI_VDEVICE(ATHEROS, 0x0029) }, /* PCI   */
	{ PCI_VDEVICE(ATHEROS, 0x002A) }, /* PCI-E */
	{ 0 }
};

static int ath_get_channel(struct ath_softc *sc,
			   struct ieee80211_channel *chan)
{
	int i;

	for (i = 0; i < sc->sc_ah->ah_nchan; i++) {
		if (sc->sc_ah->ah_channels[i].channel == chan->center_freq)
			return i;
	}

	return -1;
}

static u32 ath_get_extchanmode(struct ath_softc *sc,
				     struct ieee80211_channel *chan)
{
	u32 chanmode = 0;
	u8 ext_chan_offset = sc->sc_ht_info.ext_chan_offset;
	enum ath9k_ht_macmode tx_chan_width = sc->sc_ht_info.tx_chan_width;

	switch (chan->band) {
	case IEEE80211_BAND_2GHZ:
		if ((ext_chan_offset == IEEE80211_HT_IE_CHA_SEC_NONE) &&
		    (tx_chan_width == ATH9K_HT_MACMODE_20))
			chanmode = CHANNEL_G_HT20;
		if ((ext_chan_offset == IEEE80211_HT_IE_CHA_SEC_ABOVE) &&
		    (tx_chan_width == ATH9K_HT_MACMODE_2040))
			chanmode = CHANNEL_G_HT40PLUS;
		if ((ext_chan_offset == IEEE80211_HT_IE_CHA_SEC_BELOW) &&
		    (tx_chan_width == ATH9K_HT_MACMODE_2040))
			chanmode = CHANNEL_G_HT40MINUS;
		break;
	case IEEE80211_BAND_5GHZ:
		if ((ext_chan_offset == IEEE80211_HT_IE_CHA_SEC_NONE) &&
		    (tx_chan_width == ATH9K_HT_MACMODE_20))
			chanmode = CHANNEL_A_HT20;
		if ((ext_chan_offset == IEEE80211_HT_IE_CHA_SEC_ABOVE) &&
		    (tx_chan_width == ATH9K_HT_MACMODE_2040))
			chanmode = CHANNEL_A_HT40PLUS;
		if ((ext_chan_offset == IEEE80211_HT_IE_CHA_SEC_BELOW) &&
		    (tx_chan_width == ATH9K_HT_MACMODE_2040))
			chanmode = CHANNEL_A_HT40MINUS;
		break;
	default:
		break;
	}

	return chanmode;
}


static int ath_setkey_tkip(struct ath_softc *sc,
			   struct ieee80211_key_conf *key,
			   struct ath9k_keyval *hk,
			   const u8 *addr)
{
	u8 *key_rxmic = NULL;
	u8 *key_txmic = NULL;

	key_txmic = key->key + NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY;
	key_rxmic = key->key + NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY;

	if (addr == NULL) {
		/* Group key installation */
		memcpy(hk->kv_mic,  key_rxmic, sizeof(hk->kv_mic));
		return ath_keyset(sc, key->keyidx, hk, addr);
	}
	if (!sc->sc_splitmic) {
		/*
		 * data key goes at first index,
		 * the hal handles the MIC keys at index+64.
		 */
		memcpy(hk->kv_mic, key_rxmic, sizeof(hk->kv_mic));
		memcpy(hk->kv_txmic, key_txmic, sizeof(hk->kv_txmic));
		return ath_keyset(sc, key->keyidx, hk, addr);
	}
	/*
	 * TX key goes at first index, RX key at +32.
	 * The hal handles the MIC keys at index+64.
	 */
	memcpy(hk->kv_mic, key_txmic, sizeof(hk->kv_mic));
	if (!ath_keyset(sc, key->keyidx, hk, NULL)) {
		/* Txmic entry failed. No need to proceed further */
		DPRINTF(sc, ATH_DBG_KEYCACHE,
			"%s Setting TX MIC Key Failed\n", __func__);
		return 0;
	}

	memcpy(hk->kv_mic, key_rxmic, sizeof(hk->kv_mic));
	/* XXX delete tx key on failure? */
	return ath_keyset(sc, key->keyidx+32, hk, addr);
}

static int ath_key_config(struct ath_softc *sc,
			  const u8 *addr,
			  struct ieee80211_key_conf *key)
{
	struct ieee80211_vif *vif;
	struct ath9k_keyval hk;
	const u8 *mac = NULL;
	int ret = 0;
	enum ieee80211_if_types opmode;

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

	switch (key->alg) {
	case ALG_WEP:
		hk.kv_type = ATH9K_CIPHER_WEP;
		break;
	case ALG_TKIP:
		hk.kv_type = ATH9K_CIPHER_TKIP;
		break;
	case ALG_CCMP:
		hk.kv_type = ATH9K_CIPHER_AES_CCM;
		break;
	default:
		return -EINVAL;
	}

	hk.kv_len  = key->keylen;
	memcpy(hk.kv_val, key->key, key->keylen);

	if (!sc->sc_vaps[0])
		return -EIO;

	vif = sc->sc_vaps[0]->av_if_data;
	opmode = vif->type;

	/*
	 *  Strategy:
	 *   For _M_STA mc tx, we will not setup a key at all since we never
	 *   tx mc.
	 *   _M_STA mc rx, we will use the keyID.
	 *   for _M_IBSS mc tx, we will use the keyID, and no macaddr.
	 *   for _M_IBSS mc rx, we will alloc a slot and plumb the mac of the
	 *   peer node. BUT we will plumb a cleartext key so that we can do
	 *   perSta default key table lookup in software.
	 */
	if (is_broadcast_ether_addr(addr)) {
		switch (opmode) {
		case IEEE80211_IF_TYPE_STA:
			/* default key:  could be group WPA key
			 * or could be static WEP key */
			mac = NULL;
			break;
		case IEEE80211_IF_TYPE_IBSS:
			break;
		case IEEE80211_IF_TYPE_AP:
			break;
		default:
			ASSERT(0);
			break;
		}
	} else {
		mac = addr;
	}

	if (key->alg == ALG_TKIP)
		ret = ath_setkey_tkip(sc, key, &hk, mac);
	else
		ret = ath_keyset(sc, key->keyidx, &hk, mac);

	if (!ret)
		return -EIO;

	sc->sc_keytype = hk.kv_type;
	return 0;
}

static void ath_key_delete(struct ath_softc *sc, struct ieee80211_key_conf *key)
{
#define ATH_MAX_NUM_KEYS 4
	int freeslot;

	freeslot = (key->keyidx >= ATH_MAX_NUM_KEYS) ? 1 : 0;
	ath_key_reset(sc, key->keyidx, freeslot);
#undef ATH_MAX_NUM_KEYS
}

static void setup_ht_cap(struct ieee80211_ht_info *ht_info)
{
/* Until mac80211 includes these fields */

#define IEEE80211_HT_CAP_DSSSCCK40 0x1000
#define	IEEE80211_HT_CAP_MAXRXAMPDU_65536 0x3   /* 2 ^ 16 */
#define	IEEE80211_HT_CAP_MPDUDENSITY_8 0x6     	/* 8 usec */

	ht_info->ht_supported = 1;
	ht_info->cap = (u16)IEEE80211_HT_CAP_SUP_WIDTH
			|(u16)IEEE80211_HT_CAP_MIMO_PS
			|(u16)IEEE80211_HT_CAP_SGI_40
			|(u16)IEEE80211_HT_CAP_DSSSCCK40;

	ht_info->ampdu_factor = IEEE80211_HT_CAP_MAXRXAMPDU_65536;
	ht_info->ampdu_density = IEEE80211_HT_CAP_MPDUDENSITY_8;
	/* setup supported mcs set */
	memset(ht_info->supp_mcs_set, 0, 16);
	ht_info->supp_mcs_set[0] = 0xff;
	ht_info->supp_mcs_set[1] = 0xff;
	ht_info->supp_mcs_set[12] = IEEE80211_HT_CAP_MCS_TX_DEFINED;
}

static int ath_rate2idx(struct ath_softc *sc, int rate)
{
	int i = 0, cur_band, n_rates;
	struct ieee80211_hw *hw = sc->hw;

	cur_band = hw->conf.channel->band;
	n_rates = sc->sbands[cur_band].n_bitrates;

	for (i = 0; i < n_rates; i++) {
		if (sc->sbands[cur_band].bitrates[i].bitrate == rate)
			break;
	}

	/*
	 * NB:mac80211 validates rx rate index against the supported legacy rate
	 * index only (should be done against ht rates also), return the highest
	 * legacy rate index for rx rate which does not match any one of the
	 * supported basic and extended rates to make mac80211 happy.
	 * The following hack will be cleaned up once the issue with
	 * the rx rate index validation in mac80211 is fixed.
	 */
	if (i == n_rates)
		return n_rates - 1;
	return i;
}

static void ath9k_rx_prepare(struct ath_softc *sc,
			     struct sk_buff *skb,
			     struct ath_recv_status *status,
			     struct ieee80211_rx_status *rx_status)
{
	struct ieee80211_hw *hw = sc->hw;
	struct ieee80211_channel *curchan = hw->conf.channel;

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

	rx_status->mactime = status->tsf;
	rx_status->band = curchan->band;
	rx_status->freq =  curchan->center_freq;
	rx_status->noise = ATH_DEFAULT_NOISE_FLOOR;
	rx_status->signal = rx_status->noise + status->rssi;
	rx_status->rate_idx = ath_rate2idx(sc, (status->rateKbps / 100));
	rx_status->antenna = status->antenna;
	rx_status->qual = status->rssi * 100 / 64;

	if (status->flags & ATH_RX_MIC_ERROR)
		rx_status->flag |= RX_FLAG_MMIC_ERROR;
	if (status->flags & ATH_RX_FCS_ERROR)
		rx_status->flag |= RX_FLAG_FAILED_FCS_CRC;

	rx_status->flag |= RX_FLAG_TSFT;
}

static u8 parse_mpdudensity(u8 mpdudensity)
{
	/*
	 * 802.11n D2.0 defined values for "Minimum MPDU Start Spacing":
	 *   0 for no restriction
	 *   1 for 1/4 us
	 *   2 for 1/2 us
	 *   3 for 1 us
	 *   4 for 2 us
	 *   5 for 4 us
	 *   6 for 8 us
	 *   7 for 16 us
	 */
	switch (mpdudensity) {
	case 0:
		return 0;
	case 1:
	case 2:
	case 3:
		/* Our lower layer calculations limit our precision to
		   1 microsecond */
		return 1;
	case 4:
		return 2;
	case 5:
		return 4;
	case 6:
		return 8;
	case 7:
		return 16;
	default:
		return 0;
	}
}

static int ath9k_start(struct ieee80211_hw *hw)
{
	struct ath_softc *sc = hw->priv;
	struct ieee80211_channel *curchan = hw->conf.channel;
	int error = 0, pos;

	DPRINTF(sc, ATH_DBG_CONFIG, "%s: Starting driver with "
		"initial channel: %d MHz\n", __func__, curchan->center_freq);

	/* setup initial channel */

	pos = ath_get_channel(sc, curchan);
	if (pos == -1) {
		DPRINTF(sc, ATH_DBG_FATAL, "%s: Invalid channel\n", __func__);
		return -EINVAL;
	}

	sc->sc_ah->ah_channels[pos].chanmode =
		(curchan->band == IEEE80211_BAND_2GHZ) ? CHANNEL_G : CHANNEL_A;

	/* open ath_dev */
	error = ath_open(sc, &sc->sc_ah->ah_channels[pos]);
	if (error) {
		DPRINTF(sc, ATH_DBG_FATAL,
			"%s: Unable to complete ath_open\n", __func__);
		return error;
	}

	ieee80211_wake_queues(hw);
	return 0;
}

static int ath9k_tx(struct ieee80211_hw *hw,
		    struct sk_buff *skb)
{
	struct ath_softc *sc = hw->priv;
	int hdrlen, padsize;

	/* Add the padding after the header if this is not already done */
	hdrlen = ieee80211_get_hdrlen_from_skb(skb);
	if (hdrlen & 3) {
		padsize = hdrlen % 4;
		if (skb_headroom(skb) < padsize)
			return -1;
		skb_push(skb, padsize);
		memmove(skb->data, skb->data + padsize, hdrlen);
	}

	DPRINTF(sc, ATH_DBG_XMIT, "%s: transmitting packet, skb: %p\n",
		__func__,
		skb);

	if (ath_tx_start(sc, skb) != 0) {
		DPRINTF(sc, ATH_DBG_XMIT, "%s: TX failed\n", __func__);
		dev_kfree_skb_any(skb);
		/* FIXME: Check for proper return value from ATH_DEV */
		return 0;
	}

	return 0;
}

static void ath9k_stop(struct ieee80211_hw *hw)
{
	struct ath_softc *sc = hw->priv;
	int error;

	DPRINTF(sc, ATH_DBG_CONFIG, "%s: Driver halt\n", __func__);

	error = ath_suspend(sc);
	if (error)
		DPRINTF(sc, ATH_DBG_CONFIG,
			"%s: Device is no longer present\n", __func__);

	ieee80211_stop_queues(hw);
}

static int ath9k_add_interface(struct ieee80211_hw *hw,
			       struct ieee80211_if_init_conf *conf)
{
	struct ath_softc *sc = hw->priv;
	int error, ic_opmode = 0;

	/* Support only vap for now */

	if (sc->sc_nvaps)
		return -ENOBUFS;

	switch (conf->type) {
	case IEEE80211_IF_TYPE_STA:
		ic_opmode = ATH9K_M_STA;
		break;
	case IEEE80211_IF_TYPE_IBSS:
		ic_opmode = ATH9K_M_IBSS;
		break;
	default:
		DPRINTF(sc, ATH_DBG_FATAL,
			"%s: Only STA and IBSS are supported currently\n",
			__func__);
		return -EOPNOTSUPP;
	}

	DPRINTF(sc, ATH_DBG_CONFIG, "%s: Attach a VAP of type: %d\n",
		__func__,
		ic_opmode);

	error = ath_vap_attach(sc, 0, conf->vif, ic_opmode);
	if (error) {
		DPRINTF(sc, ATH_DBG_FATAL,
			"%s: Unable to attach vap, error: %d\n",
			__func__, error);
		return error;
	}

	return 0;
}

static void ath9k_remove_interface(struct ieee80211_hw *hw,
				   struct ieee80211_if_init_conf *conf)
{
	struct ath_softc *sc = hw->priv;
	struct ath_vap *avp;
	int error;

	DPRINTF(sc, ATH_DBG_CONFIG, "%s: Detach VAP\n", __func__);

	avp = sc->sc_vaps[0];
	if (avp == NULL) {
		DPRINTF(sc, ATH_DBG_FATAL, "%s: Invalid interface\n",
			__func__);
		return;
	}

#ifdef CONFIG_SLOW_ANT_DIV
	ath_slow_ant_div_stop(&sc->sc_antdiv);
#endif

	/* Update ratectrl */
	ath_rate_newstate(sc, avp);

	/* Reclaim beacon resources */
	if (sc->sc_opmode == ATH9K_M_HOSTAP || sc->sc_opmode == ATH9K_M_IBSS) {
		ath9k_hw_stoptxdma(sc->sc_ah, sc->sc_bhalq);
		ath_beacon_return(sc, avp);
	}

	/* Set interrupt mask */
	sc->sc_imask &= ~(ATH9K_INT_SWBA | ATH9K_INT_BMISS);
	ath9k_hw_set_interrupts(sc->sc_ah, sc->sc_imask & ~ATH9K_INT_GLOBAL);
	sc->sc_beacons = 0;

	error = ath_vap_detach(sc, 0);
	if (error)
		DPRINTF(sc, ATH_DBG_FATAL,
			"%s: Unable to detach vap, error: %d\n",
			__func__, error);
}

static int ath9k_config(struct ieee80211_hw *hw,
			struct ieee80211_conf *conf)
{
	struct ath_softc *sc = hw->priv;
	struct ieee80211_channel *curchan = hw->conf.channel;
	int pos;

	DPRINTF(sc, ATH_DBG_CONFIG, "%s: Set channel: %d MHz\n",
		__func__,
		curchan->center_freq);

	pos = ath_get_channel(sc, curchan);
	if (pos == -1) {
		DPRINTF(sc, ATH_DBG_FATAL, "%s: Invalid channel\n", __func__);
		return -EINVAL;
	}

	sc->sc_ah->ah_channels[pos].chanmode =
		(curchan->band == IEEE80211_BAND_2GHZ) ?
		CHANNEL_G : CHANNEL_A;

	if (sc->sc_curaid && hw->conf.ht_conf.ht_supported)
		sc->sc_ah->ah_channels[pos].chanmode =
			ath_get_extchanmode(sc, curchan);

	sc->sc_config.txpowlimit = 2 * conf->power_level;

	/* set h/w channel */
	if (ath_set_channel(sc, &sc->sc_ah->ah_channels[pos]) < 0)
		DPRINTF(sc, ATH_DBG_FATAL, "%s: Unable to set channel\n",
			__func__);

	return 0;
}

static int ath9k_config_interface(struct ieee80211_hw *hw,
				  struct ieee80211_vif *vif,
				  struct ieee80211_if_conf *conf)
{
	struct ath_softc *sc = hw->priv;
	struct ath_vap *avp;
	u32 rfilt = 0;
	int error, i;
	DECLARE_MAC_BUF(mac);

	avp = sc->sc_vaps[0];
	if (avp == NULL) {
		DPRINTF(sc, ATH_DBG_FATAL, "%s: Invalid interface\n",
			__func__);
		return -EINVAL;
	}

	if ((conf->changed & IEEE80211_IFCC_BSSID) &&
	    !is_zero_ether_addr(conf->bssid)) {
		switch (vif->type) {
		case IEEE80211_IF_TYPE_STA:
		case IEEE80211_IF_TYPE_IBSS:
			/* Update ratectrl about the new state */
			ath_rate_newstate(sc, avp);

			/* Set rx filter */
			rfilt = ath_calcrxfilter(sc);
			ath9k_hw_setrxfilter(sc->sc_ah, rfilt);

			/* Set BSSID */
			memcpy(sc->sc_curbssid, conf->bssid, ETH_ALEN);
			sc->sc_curaid = 0;
			ath9k_hw_write_associd(sc->sc_ah, sc->sc_curbssid,
					       sc->sc_curaid);

			/* Set aggregation protection mode parameters */
			sc->sc_config.ath_aggr_prot = 0;

			/*
			 * Reset our TSF so that its value is lower than the
			 * beacon that we are trying to catch.
			 * Only then hw will update its TSF register with the
			 * new beacon. Reset the TSF before setting the BSSID
			 * to avoid allowing in any frames that would update
			 * our TSF only to have us clear it
			 * immediately thereafter.
			 */
			ath9k_hw_reset_tsf(sc->sc_ah);

			/* Disable BMISS interrupt when we're not associated */
			ath9k_hw_set_interrupts(sc->sc_ah,
					sc->sc_imask &
					~(ATH9K_INT_SWBA | ATH9K_INT_BMISS));
			sc->sc_imask &= ~(ATH9K_INT_SWBA | ATH9K_INT_BMISS);

			DPRINTF(sc, ATH_DBG_CONFIG,
				"%s: RX filter 0x%x bssid %s aid 0x%x\n",
				__func__, rfilt,
				print_mac(mac, sc->sc_curbssid), sc->sc_curaid);

			/* need to reconfigure the beacon */
			sc->sc_beacons = 0;

			break;
		default:
			break;
		}
	}

	if ((conf->changed & IEEE80211_IFCC_BEACON) &&
	    (vif->type == IEEE80211_IF_TYPE_IBSS)) {
		/*
		 * Allocate and setup the beacon frame.
		 *
		 * Stop any previous beacon DMA.  This may be
		 * necessary, for example, when an ibss merge
		 * causes reconfiguration; we may be called
		 * with beacon transmission active.
		 */
		ath9k_hw_stoptxdma(sc->sc_ah, sc->sc_bhalq);

		error = ath_beacon_alloc(sc, 0);
		if (error != 0)
			return error;

		ath_beacon_sync(sc, 0);
	}

	/* Check for WLAN_CAPABILITY_PRIVACY ? */
	if ((avp->av_opmode != IEEE80211_IF_TYPE_STA)) {
		for (i = 0; i < IEEE80211_WEP_NKID; i++)
			if (ath9k_hw_keyisvalid(sc->sc_ah, (u16)i))
				ath9k_hw_keysetmac(sc->sc_ah,
						   (u16)i,
						   sc->sc_curbssid);
	}

	/* Only legacy IBSS for now */
	if (vif->type == IEEE80211_IF_TYPE_IBSS)
		ath_update_chainmask(sc, 0);

	return 0;
}

#define SUPPORTED_FILTERS			\
	(FIF_PROMISC_IN_BSS |			\
	FIF_ALLMULTI |				\
	FIF_CONTROL |				\
	FIF_OTHER_BSS |				\
	FIF_BCN_PRBRESP_PROMISC |		\
	FIF_FCSFAIL)

/* Accept unicast, bcast and mcast frames */

static void ath9k_configure_filter(struct ieee80211_hw *hw,
				   unsigned int changed_flags,
				   unsigned int *total_flags,
				   int mc_count,
				   struct dev_mc_list *mclist)
{
	struct ath_softc *sc = hw->priv;

	changed_flags &= SUPPORTED_FILTERS;
	*total_flags &= SUPPORTED_FILTERS;

	if (changed_flags & FIF_BCN_PRBRESP_PROMISC) {
		if (*total_flags & FIF_BCN_PRBRESP_PROMISC)
			ath_scan_start(sc);
		else
			ath_scan_end(sc);
	}
}

static void ath9k_sta_notify(struct ieee80211_hw *hw,
			     struct ieee80211_vif *vif,
			     enum sta_notify_cmd cmd,
			     const u8 *addr)
{
	struct ath_softc *sc = hw->priv;
	struct ath_node *an;
	unsigned long flags;
	DECLARE_MAC_BUF(mac);

	spin_lock_irqsave(&sc->node_lock, flags);
	an = ath_node_find(sc, (u8 *) addr);
	spin_unlock_irqrestore(&sc->node_lock, flags);

	switch (cmd) {
	case STA_NOTIFY_ADD:
		spin_lock_irqsave(&sc->node_lock, flags);
		if (!an) {
			ath_node_attach(sc, (u8 *)addr, 0);
			DPRINTF(sc, ATH_DBG_CONFIG, "%s: Attach a node: %s\n",
				__func__,
				print_mac(mac, addr));
		} else {
			ath_node_get(sc, (u8 *)addr);
		}
		spin_unlock_irqrestore(&sc->node_lock, flags);
		break;
	case STA_NOTIFY_REMOVE:
		if (!an)
			DPRINTF(sc, ATH_DBG_FATAL,
				"%s: Removal of a non-existent node\n",
				__func__);
		else {
			ath_node_put(sc, an, ATH9K_BH_STATUS_INTACT);
			DPRINTF(sc, ATH_DBG_CONFIG, "%s: Put a node: %s\n",
				__func__,
				print_mac(mac, addr));
		}
		break;
	default:
		break;
	}
}

static int ath9k_conf_tx(struct ieee80211_hw *hw,
			 u16 queue,
			 const struct ieee80211_tx_queue_params *params)
{
	struct ath_softc *sc = hw->priv;
	struct ath9k_tx_queue_info qi;
	int ret = 0, qnum;

	if (queue >= WME_NUM_AC)
		return 0;

	qi.tqi_aifs = params->aifs;
	qi.tqi_cwmin = params->cw_min;
	qi.tqi_cwmax = params->cw_max;
	qi.tqi_burstTime = params->txop;
	qnum = ath_get_hal_qnum(queue, sc);

	DPRINTF(sc, ATH_DBG_CONFIG,
		"%s: Configure tx [queue/halq] [%d/%d],  "
		"aifs: %d, cw_min: %d, cw_max: %d, txop: %d\n",
		__func__,
		queue,
		qnum,
		params->aifs,
		params->cw_min,