drivers/net/wireless/rt2x00/rt2x00mac.c - kernel/msm-4.9 - Gitiles

 /*
 	Copyright (C) 2004 - 2009 Ivo van Doorn <IvDoorn@gmail.com>
 	<http://rt2x00.serialmonkey.com>

 	This program is free software; you can redistribute it and/or modify
 	it under the terms of the GNU General Public License as published by
 	the Free Software Foundation; either version 2 of the License, or
 	(at your option) any later version.

 	This program is distributed in the hope that it will be useful,
 	but WITHOUT ANY WARRANTY; without even the implied warranty of
 	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 	GNU General Public License for more details.

 	You should have received a copy of the GNU General Public License
 	along with this program; if not, write to the
 	Free Software Foundation, Inc.,
 	59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  */

 /*
 	Module: rt2x00mac
 	Abstract: rt2x00 generic mac80211 routines.
  */

 #include <linux/kernel.h>
 #include <linux/module.h>

 #include "rt2x00.h"
 #include "rt2x00lib.h"

 static int rt2x00mac_tx_rts_cts(struct rt2x00_dev *rt2x00dev,
 				struct data_queue *queue,
 				struct sk_buff *frag_skb)
 {
 	struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(frag_skb);
 	struct ieee80211_tx_info *rts_info;
 	struct sk_buff *skb;
 	unsigned int data_length;
 	int retval = 0;

 	if (tx_info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
 		data_length = sizeof(struct ieee80211_cts);
 	else
 		data_length = sizeof(struct ieee80211_rts);

 	skb = dev_alloc_skb(data_length + rt2x00dev->hw->extra_tx_headroom);
 	if (unlikely(!skb)) {
 		WARNING(rt2x00dev, "Failed to create RTS/CTS frame.\n");
 		return -ENOMEM;
 	}

 	skb_reserve(skb, rt2x00dev->hw->extra_tx_headroom);
 	skb_put(skb, data_length);

 	/*
 	 * Copy TX information over from original frame to
 	 * RTS/CTS frame. Note that we set the no encryption flag
 	 * since we don't want this frame to be encrypted.
 	 * RTS frames should be acked, while CTS-to-self frames
 	 * should not. The ready for TX flag is cleared to prevent
 	 * it being automatically send when the descriptor is
 	 * written to the hardware.
 	 */
 	memcpy(skb->cb, frag_skb->cb, sizeof(skb->cb));
 	rts_info = IEEE80211_SKB_CB(skb);
 	rts_info->control.rates[0].flags &= ~IEEE80211_TX_RC_USE_RTS_CTS;
 	rts_info->control.rates[0].flags &= ~IEEE80211_TX_RC_USE_CTS_PROTECT;

 	if (tx_info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
 		rts_info->flags |= IEEE80211_TX_CTL_NO_ACK;
 	else
 		rts_info->flags &= ~IEEE80211_TX_CTL_NO_ACK;

 	/* Disable hardware encryption */
 	rts_info->control.hw_key = NULL;

 	/*
 	 * RTS/CTS frame should use the length of the frame plus any
 	 * encryption overhead that will be added by the hardware.
 	 */
 	data_length += rt2x00crypto_tx_overhead(rt2x00dev, skb);

 	if (tx_info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
 		ieee80211_ctstoself_get(rt2x00dev->hw, tx_info->control.vif,
 					frag_skb->data, data_length, tx_info,
 					(struct ieee80211_cts *)(skb->data));
 	else
 		ieee80211_rts_get(rt2x00dev->hw, tx_info->control.vif,
 				  frag_skb->data, data_length, tx_info,
 				  (struct ieee80211_rts *)(skb->data));

 	retval = rt2x00queue_write_tx_frame(queue, skb, true);
 	if (retval) {
 		dev_kfree_skb_any(skb);
 		WARNING(rt2x00dev, "Failed to send RTS/CTS frame.\n");
 	}

 	return retval;
 }

 int rt2x00mac_tx(struct ieee80211_hw *hw, struct sk_buff *skb)
 {
 	struct rt2x00_dev *rt2x00dev = hw->priv;
 	struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
 	enum data_queue_qid qid = skb_get_queue_mapping(skb);
 	struct data_queue *queue;

 	/*
 	 * Mac80211 might be calling this function while we are trying
 	 * to remove the device or perhaps suspending it.
 	 * Note that we can only stop the TX queues inside the TX path
 	 * due to possible race conditions in mac80211.
 	 */
 	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 		goto exit_fail;

 	/*
 	 * Determine which queue to put packet on.
 	 */
 	if (tx_info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM &&
 	    test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags))
 		queue = rt2x00queue_get_queue(rt2x00dev, QID_ATIM);
 	else
 		queue = rt2x00queue_get_queue(rt2x00dev, qid);
 	if (unlikely(!queue)) {
 		ERROR(rt2x00dev,
 		      "Attempt to send packet over invalid queue %d.\n"
 		      "Please file bug report to %s.\n", qid, DRV_PROJECT);
 		goto exit_fail;
 	}

 	/*
 	 * If CTS/RTS is required. create and queue that frame first.
 	 * Make sure we have at least enough entries available to send
 	 * this CTS/RTS frame as well as the data frame.
 	 * Note that when the driver has set the set_rts_threshold()
 	 * callback function it doesn't need software generation of
 	 * either RTS or CTS-to-self frame and handles everything
 	 * inside the hardware.
 	 */
 	if ((tx_info->control.rates[0].flags & (IEEE80211_TX_RC_USE_RTS_CTS |
 						IEEE80211_TX_RC_USE_CTS_PROTECT)) &&
 	    !rt2x00dev->ops->hw->set_rts_threshold) {
 		if (rt2x00queue_available(queue) <= 1)
 			goto exit_fail;

 		if (rt2x00mac_tx_rts_cts(rt2x00dev, queue, skb))
 			goto exit_fail;
 	}

 	if (rt2x00queue_write_tx_frame(queue, skb, false))
 		goto exit_fail;

 	if (rt2x00queue_threshold(queue))
 		ieee80211_stop_queue(rt2x00dev->hw, qid);

 	return NETDEV_TX_OK;

  exit_fail:
 	ieee80211_stop_queue(rt2x00dev->hw, qid);
 	dev_kfree_skb_any(skb);
 	return NETDEV_TX_OK;
 }
 EXPORT_SYMBOL_GPL(rt2x00mac_tx);

 int rt2x00mac_start(struct ieee80211_hw *hw)
 {
 	struct rt2x00_dev *rt2x00dev = hw->priv;

 	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 		return 0;

 	return rt2x00lib_start(rt2x00dev);
 }
 EXPORT_SYMBOL_GPL(rt2x00mac_start);

 void rt2x00mac_stop(struct ieee80211_hw *hw)
 {
 	struct rt2x00_dev *rt2x00dev = hw->priv;

 	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 		return;

 	rt2x00lib_stop(rt2x00dev);
 }
 EXPORT_SYMBOL_GPL(rt2x00mac_stop);

 int rt2x00mac_add_interface(struct ieee80211_hw *hw,
 			    struct ieee80211_vif *vif)
 {
 	struct rt2x00_dev *rt2x00dev = hw->priv;
 	struct rt2x00_intf *intf = vif_to_intf(vif);
 	struct data_queue *queue = rt2x00queue_get_queue(rt2x00dev, QID_BEACON);
 	struct queue_entry *entry = NULL;
 	unsigned int i;

 	/*
 	 * Don't allow interfaces to be added
 	 * the device has disappeared.
 	 */
 	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
 	    !test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
 		return -ENODEV;

 	switch (vif->type) {
 	case NL80211_IFTYPE_AP:
 		/*
 		 * We don't support mixed combinations of
 		 * sta and ap interfaces.
 		 */
 		if (rt2x00dev->intf_sta_count)
 			return -ENOBUFS;

 		/*
 		 * Check if we exceeded the maximum amount
 		 * of supported interfaces.
 		 */
 		if (rt2x00dev->intf_ap_count >= rt2x00dev->ops->max_ap_intf)
 			return -ENOBUFS;

 		break;
 	case NL80211_IFTYPE_STATION:
 	case NL80211_IFTYPE_ADHOC:
 	case NL80211_IFTYPE_MESH_POINT:
 	case NL80211_IFTYPE_WDS:
 		/*
 		 * We don't support mixed combinations of
 		 * sta and ap interfaces.
 		 */
 		if (rt2x00dev->intf_ap_count)
 			return -ENOBUFS;

 		/*
 		 * Check if we exceeded the maximum amount
 		 * of supported interfaces.
 		 */
 		if (rt2x00dev->intf_sta_count >= rt2x00dev->ops->max_sta_intf)
 			return -ENOBUFS;

 		break;
 	default:
 		return -EINVAL;
 	}

 	/*
 	 * Loop through all beacon queues to find a free
 	 * entry. Since there are as much beacon entries
 	 * as the maximum interfaces, this search shouldn't
 	 * fail.
 	 */
 	for (i = 0; i < queue->limit; i++) {
 		entry = &queue->entries[i];
 		if (!test_and_set_bit(ENTRY_BCN_ASSIGNED, &entry->flags))
 			break;
 	}

 	if (unlikely(i == queue->limit))
 		return -ENOBUFS;

 	/*
 	 * We are now absolutely sure the interface can be created,
 	 * increase interface count and start initialization.
 	 */

 	if (vif->type == NL80211_IFTYPE_AP)
 		rt2x00dev->intf_ap_count++;
 	else
 		rt2x00dev->intf_sta_count++;

 	spin_lock_init(&intf->lock);
 	spin_lock_init(&intf->seqlock);
 	mutex_init(&intf->beacon_skb_mutex);
 	intf->beacon = entry;

 	/*
 	 * The MAC adddress must be configured after the device
 	 * has been initialized. Otherwise the device can reset
 	 * the MAC registers.
 	 * The BSSID address must only be configured in AP mode,
 	 * however we should not send an empty BSSID address for
 	 * STA interfaces at this time, since this can cause
 	 * invalid behavior in the device.
 	 */
 	memcpy(&intf->mac, vif->addr, ETH_ALEN);
 	if (vif->type == NL80211_IFTYPE_AP) {
 		memcpy(&intf->bssid, vif->addr, ETH_ALEN);
 		rt2x00lib_config_intf(rt2x00dev, intf, vif->type,
 				      intf->mac, intf->bssid);
 	} else {
 		rt2x00lib_config_intf(rt2x00dev, intf, vif->type,
 				      intf->mac, NULL);
 	}

 	/*
 	 * Some filters depend on the current working mode. We can force
 	 * an update during the next configure_filter() run by mac80211 by
 	 * resetting the current packet_filter state.
 	 */
 	rt2x00dev->packet_filter = 0;

 	return 0;
 }
 EXPORT_SYMBOL_GPL(rt2x00mac_add_interface);

 void rt2x00mac_remove_interface(struct ieee80211_hw *hw,
 				struct ieee80211_vif *vif)
 {
 	struct rt2x00_dev *rt2x00dev = hw->priv;
 	struct rt2x00_intf *intf = vif_to_intf(vif);

 	/*
 	 * Don't allow interfaces to be remove while
 	 * either the device has disappeared or when
 	 * no interface is present.
 	 */
 	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) ||
 	    (vif->type == NL80211_IFTYPE_AP && !rt2x00dev->intf_ap_count) ||
 	    (vif->type != NL80211_IFTYPE_AP && !rt2x00dev->intf_sta_count))
 		return;

 	if (vif->type == NL80211_IFTYPE_AP)
 		rt2x00dev->intf_ap_count--;
 	else
 		rt2x00dev->intf_sta_count--;

 	/*
 	 * Release beacon entry so it is available for
 	 * new interfaces again.
 	 */
 	clear_bit(ENTRY_BCN_ASSIGNED, &intf->beacon->flags);

 	/*
 	 * Make sure the bssid and mac address registers
 	 * are cleared to prevent false ACKing of frames.
 	 */
 	rt2x00lib_config_intf(rt2x00dev, intf,
 			      NL80211_IFTYPE_UNSPECIFIED, NULL, NULL);
 }
 EXPORT_SYMBOL_GPL(rt2x00mac_remove_interface);

 int rt2x00mac_config(struct ieee80211_hw *hw, u32 changed)
 {
 	struct rt2x00_dev *rt2x00dev = hw->priv;
 	struct ieee80211_conf *conf = &hw->conf;

 	/*
 	 * mac80211 might be calling this function while we are trying
 	 * to remove the device or perhaps suspending it.
 	 */
 	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 		return 0;

 	/*
 	 * Some configuration parameters (e.g. channel and antenna values) can
 	 * only be set when the radio is enabled, but do require the RX to
 	 * be off. During this period we should keep link tuning enabled,
 	 * if for any reason the link tuner must be reset, this will be
 	 * handled by rt2x00lib_config().
 	 */
 	rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF_LINK);

 	/*
 	 * When we've just turned on the radio, we want to reprogram
 	 * everything to ensure a consistent state
 	 */
 	rt2x00lib_config(rt2x00dev, conf, changed);

 	/*
 	 * After the radio has been enabled we need to configure
 	 * the antenna to the default settings. rt2x00lib_config_antenna()
 	 * should determine if any action should be taken based on
 	 * checking if diversity has been enabled or no antenna changes
 	 * have been made since the last configuration change.
 	 */
 	rt2x00lib_config_antenna(rt2x00dev, rt2x00dev->default_ant);

 	/* Turn RX back on */
 	rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON_LINK);

 	return 0;
 }
 EXPORT_SYMBOL_GPL(rt2x00mac_config);

 void rt2x00mac_configure_filter(struct ieee80211_hw *hw,
 				unsigned int changed_flags,
 				unsigned int *total_flags,
 				u64 multicast)
 {
 	struct rt2x00_dev *rt2x00dev = hw->priv;

 	/*
 	 * Mask off any flags we are going to ignore
 	 * from the total_flags field.
 	 */
 	*total_flags &=
 	    FIF_ALLMULTI |
 	    FIF_FCSFAIL |
 	    FIF_PLCPFAIL |
 	    FIF_CONTROL |
 	    FIF_PSPOLL |
 	    FIF_OTHER_BSS |
 	    FIF_PROMISC_IN_BSS;

 	/*
 	 * Apply some rules to the filters:
 	 * - Some filters imply different filters to be set.
 	 * - Some things we can't filter out at all.
 	 * - Multicast filter seems to kill broadcast traffic so never use it.
 	 */
 	*total_flags |= FIF_ALLMULTI;
 	if (*total_flags & FIF_OTHER_BSS ||
 	    *total_flags & FIF_PROMISC_IN_BSS)
 		*total_flags |= FIF_PROMISC_IN_BSS | FIF_OTHER_BSS;

 	/*
 	 * If the device has a single filter for all control frames,
 	 * FIF_CONTROL and FIF_PSPOLL flags imply each other.
 	 * And if the device has more than one filter for control frames
 	 * of different types, but has no a separate filter for PS Poll frames,
 	 * FIF_CONTROL flag implies FIF_PSPOLL.
 	 */
 	if (!test_bit(DRIVER_SUPPORT_CONTROL_FILTERS, &rt2x00dev->flags)) {
 		if (*total_flags & FIF_CONTROL || *total_flags & FIF_PSPOLL)
 			*total_flags |= FIF_CONTROL | FIF_PSPOLL;
 	}
 	if (!test_bit(DRIVER_SUPPORT_CONTROL_FILTER_PSPOLL, &rt2x00dev->flags)) {
 		if (*total_flags & FIF_CONTROL)
 			*total_flags |= FIF_PSPOLL;
 	}

 	/*
 	 * Check if there is any work left for us.
 	 */
 	if (rt2x00dev->packet_filter == *total_flags)
 		return;
 	rt2x00dev->packet_filter = *total_flags;

 	rt2x00dev->ops->lib->config_filter(rt2x00dev, *total_flags);
 }
 EXPORT_SYMBOL_GPL(rt2x00mac_configure_filter);

 static void rt2x00mac_set_tim_iter(void *data, u8 *mac,
 				   struct ieee80211_vif *vif)
 {
 	struct rt2x00_intf *intf = vif_to_intf(vif);

 	if (vif->type != NL80211_IFTYPE_AP &&
 	    vif->type != NL80211_IFTYPE_ADHOC &&
 	    vif->type != NL80211_IFTYPE_MESH_POINT &&
 	    vif->type != NL80211_IFTYPE_WDS)
 		return;

 	spin_lock(&intf->lock);
 	intf->delayed_flags |= DELAYED_UPDATE_BEACON;
 	spin_unlock(&intf->lock);
 }

 int rt2x00mac_set_tim(struct ieee80211_hw *hw, struct ieee80211_sta *sta,
 		      bool set)
 {
 	struct rt2x00_dev *rt2x00dev = hw->priv;

 	if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
 		return 0;

 	ieee80211_iterate_active_interfaces_atomic(rt2x00dev->hw,
 						   rt2x00mac_set_tim_iter,
 						   rt2x00dev);

 	/* queue work to upodate the beacon template */
 	ieee80211_queue_work(rt2x00dev->hw, &rt2x00dev->intf_work);
 	return 0;
 }
 EXPORT_SYMBOL_GPL(rt2x00mac_set_tim);

 #ifdef CONFIG_RT2X00_LIB_CRYPTO
 static void memcpy_tkip(struct rt2x00lib_crypto *crypto, u8 *key, u8 key_len)
 {
 	if (key_len > NL80211_TKIP_DATA_OFFSET_ENCR_KEY)
 		memcpy(&crypto->key,
 		       &key[NL80211_TKIP_DATA_OFFSET_ENCR_KEY],
 		       sizeof(crypto->key));

 	if (key_len > NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY)
 		memcpy(&crypto->tx_mic,
 		       &key[NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY],
 		       sizeof(crypto->tx_mic));

 	if (key_len > NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY)
 		memcpy(&crypto->rx_mic,
 		       &key[NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY],
 		       sizeof(crypto->rx_mic));
 }

 int rt2x00mac_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
 		      struct ieee80211_vif *vif, struct ieee80211_sta *sta,
 		      struct ieee80211_key_conf *key)
 {
 	struct rt2x00_dev *rt2x00dev = hw->priv;
 	struct rt2x00_intf *intf = vif_to_intf(vif);
 	int (*set_key) (struct rt2x00_dev *rt2x00dev,
 			struct rt2x00lib_crypto *crypto,
 			struct ieee80211_key_conf *key);
 	struct rt2x00lib_crypto crypto;
 	static const u8 bcast_addr[ETH_ALEN] =
 		{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, };

 	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 		return 0;
 	else if (!test_bit(CONFIG_SUPPORT_HW_CRYPTO, &rt2x00dev->flags))
 		return -EOPNOTSUPP;
 	else if (key->keylen > 32)
 		return -ENOSPC;

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

 	/*
 	 * When in STA mode, bssidx is always 0 otherwise local_address[5]
 	 * contains the bss number, see BSS_ID_MASK comments for details.
 	 */
 	if (rt2x00dev->intf_sta_count)
 		crypto.bssidx = 0;
 	else
 		crypto.bssidx = intf->mac[5] & (rt2x00dev->ops->max_ap_intf - 1);

 	crypto.cipher = rt2x00crypto_key_to_cipher(key);
 	if (crypto.cipher == CIPHER_NONE)
 		return -EOPNOTSUPP;

 	crypto.cmd = cmd;

 	if (sta) {
 		/* some drivers need the AID */
 		crypto.aid = sta->aid;
 		crypto.address = sta->addr;
 	} else
 		crypto.address = bcast_addr;

 	if (crypto.cipher == CIPHER_TKIP)
 		memcpy_tkip(&crypto, &key->key[0], key->keylen);
 	else
 		memcpy(&crypto.key, &key->key[0], key->keylen);
 	/*
 	 * Each BSS has a maximum of 4 shared keys.
 	 * Shared key index values:
 	 *	0) BSS0 key0
 	 *	1) BSS0 key1
 	 *	...
 	 *	4) BSS1 key0
 	 *	...
 	 *	8) BSS2 key0
 	 *	...
 	 * Both pairwise as shared key indeces are determined by
 	 * driver. This is required because the hardware requires
 	 * keys to be assigned in correct order (When key 1 is
 	 * provided but key 0 is not, then the key is not found
 	 * by the hardware during RX).
 	 */
 	if (cmd == SET_KEY)
 		key->hw_key_idx = 0;

 	if (key->flags & IEEE80211_KEY_FLAG_PAIRWISE)
 		set_key = rt2x00dev->ops->lib->config_pairwise_key;
 	else
 		set_key = rt2x00dev->ops->lib->config_shared_key;

 	if (!set_key)
 		return -EOPNOTSUPP;

 	return set_key(rt2x00dev, &crypto, key);
 }
 EXPORT_SYMBOL_GPL(rt2x00mac_set_key);
 #endif /* CONFIG_RT2X00_LIB_CRYPTO */

 void rt2x00mac_sw_scan_start(struct ieee80211_hw *hw)
 {
 	struct rt2x00_dev *rt2x00dev = hw->priv;
 	__set_bit(DEVICE_STATE_SCANNING, &rt2x00dev->flags);
 	rt2x00link_stop_tuner(rt2x00dev);
 }
 EXPORT_SYMBOL_GPL(rt2x00mac_sw_scan_start);

 void rt2x00mac_sw_scan_complete(struct ieee80211_hw *hw)
 {
 	struct rt2x00_dev *rt2x00dev = hw->priv;
 	__clear_bit(DEVICE_STATE_SCANNING, &rt2x00dev->flags);
 	rt2x00link_start_tuner(rt2x00dev);
 }
 EXPORT_SYMBOL_GPL(rt2x00mac_sw_scan_complete);

 int rt2x00mac_get_stats(struct ieee80211_hw *hw,
 			struct ieee80211_low_level_stats *stats)
 {
 	struct rt2x00_dev *rt2x00dev = hw->priv;

 	/*
 	 * The dot11ACKFailureCount, dot11RTSFailureCount and
 	 * dot11RTSSuccessCount are updated in interrupt time.
 	 * dot11FCSErrorCount is updated in the link tuner.
 	 */
 	memcpy(stats, &rt2x00dev->low_level_stats, sizeof(*stats));

 	return 0;
 }
 EXPORT_SYMBOL_GPL(rt2x00mac_get_stats);

 void rt2x00mac_bss_info_changed(struct ieee80211_hw *hw,
 				struct ieee80211_vif *vif,
 				struct ieee80211_bss_conf *bss_conf,
 				u32 changes)
 {
 	struct rt2x00_dev *rt2x00dev = hw->priv;
 	struct rt2x00_intf *intf = vif_to_intf(vif);

 	/*
 	 * mac80211 might be calling this function while we are trying
 	 * to remove the device or perhaps suspending it.
 	 */
 	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
 		return;

 	spin_lock(&intf->lock);

 	/*
 	 * conf->bssid can be NULL if coming from the internal
 	 * beacon update routine.
 	 */
 	if (changes & BSS_CHANGED_BSSID)
 		memcpy(&intf->bssid, bss_conf->bssid, ETH_ALEN);

 	spin_unlock(&intf->lock);

 	/*
 	 * Call rt2x00_config_intf() outside of the spinlock context since
 	 * the call will sleep for USB drivers. By using the ieee80211_if_conf
 	 * values as arguments we make keep access to rt2x00_intf thread safe
 	 * even without the lock.
 	 */
 	if (changes & BSS_CHANGED_BSSID)
 		rt2x00lib_config_intf(rt2x00dev, intf, vif->type, NULL,
 				      bss_conf->bssid);

 	/*
 	 * Update the beacon.
 	 */
 	if (changes & (BSS_CHANGED_BEACON | BSS_CHANGED_BEACON_ENABLED))
 		rt2x00queue_update_beacon(rt2x00dev, vif,
 					  bss_conf->enable_beacon);

 	/*
 	 * When the association status has changed we must reset the link
 	 * tuner counter. This is because some drivers determine if they
 	 * should perform link tuning based on the number of seconds
 	 * while associated or not associated.
 	 */
 	if (changes & BSS_CHANGED_ASSOC) {
 		rt2x00dev->link.count = 0;

 		if (bss_conf->assoc)
 			rt2x00dev->intf_associated++;
 		else
 			rt2x00dev->intf_associated--;

 		rt2x00leds_led_assoc(rt2x00dev, !!rt2x00dev->intf_associated);
 	}

 	/*
 	 * When the erp information has changed, we should perform
 	 * additional configuration steps. For all other changes we are done.
 	 */
 	if (changes & ~(BSS_CHANGED_ASSOC | BSS_CHANGED_HT))
 		rt2x00lib_config_erp(rt2x00dev, intf, bss_conf);
 }
 EXPORT_SYMBOL_GPL(rt2x00mac_bss_info_changed);

 int rt2x00mac_conf_tx(struct ieee80211_hw *hw, u16 queue_idx,
 		      const struct ieee80211_tx_queue_params *params)
 {
 	struct rt2x00_dev *rt2x00dev = hw->priv;
 	struct data_queue *queue;

 	queue = rt2x00queue_get_queue(rt2x00dev, queue_idx);
 	if (unlikely(!queue))
 		return -EINVAL;

 	/*
 	 * The passed variables are stored as real value ((2^n)-1).
 	 * Ralink registers require to know the bit number 'n'.
 	 */
 	if (params->cw_min > 0)
 		queue->cw_min = fls(params->cw_min);
 	else
 		queue->cw_min = 5; /* cw_min: 2^5 = 32. */

 	if (params->cw_max > 0)
 		queue->cw_max = fls(params->cw_max);
 	else
 		queue->cw_max = 10; /* cw_min: 2^10 = 1024. */

 	queue->aifs = params->aifs;
 	queue->txop = params->txop;

 	INFO(rt2x00dev,
 	     "Configured TX queue %d - CWmin: %d, CWmax: %d, Aifs: %d, TXop: %d.\n",
 	     queue_idx, queue->cw_min, queue->cw_max, queue->aifs, queue->txop);

 	return 0;
 }
 EXPORT_SYMBOL_GPL(rt2x00mac_conf_tx);

 void rt2x00mac_rfkill_poll(struct ieee80211_hw *hw)
 {
 	struct rt2x00_dev *rt2x00dev = hw->priv;
 	bool active = !!rt2x00dev->ops->lib->rfkill_poll(rt2x00dev);

 	wiphy_rfkill_set_hw_state(hw->wiphy, !active);
 }
 EXPORT_SYMBOL_GPL(rt2x00mac_rfkill_poll);
	/*
	Copyright (C) 2004 - 2009 Ivo van Doorn <IvDoorn@gmail.com>
	<http://rt2x00.serialmonkey.com>

	This program is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2 of the License, or
	(at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program; if not, write to the
	Free Software Foundation, Inc.,
	59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	*/

	/*
	Module: rt2x00mac
	Abstract: rt2x00 generic mac80211 routines.
	*/

	#include <linux/kernel.h>
	#include <linux/module.h>

	#include "rt2x00.h"
	#include "rt2x00lib.h"

	static int rt2x00mac_tx_rts_cts(struct rt2x00_dev *rt2x00dev,
	struct data_queue *queue,
	struct sk_buff *frag_skb)
	{
	struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(frag_skb);
	struct ieee80211_tx_info *rts_info;
	struct sk_buff *skb;
	unsigned int data_length;
	int retval = 0;

	if (tx_info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
	data_length = sizeof(struct ieee80211_cts);
	else
	data_length = sizeof(struct ieee80211_rts);

	skb = dev_alloc_skb(data_length + rt2x00dev->hw->extra_tx_headroom);
	if (unlikely(!skb)) {
	WARNING(rt2x00dev, "Failed to create RTS/CTS frame.\n");
	return -ENOMEM;
	}

	skb_reserve(skb, rt2x00dev->hw->extra_tx_headroom);
	skb_put(skb, data_length);

	/*
	* Copy TX information over from original frame to
	* RTS/CTS frame. Note that we set the no encryption flag
	* since we don't want this frame to be encrypted.
	* RTS frames should be acked, while CTS-to-self frames
	* should not. The ready for TX flag is cleared to prevent
	* it being automatically send when the descriptor is
	* written to the hardware.
	*/
	memcpy(skb->cb, frag_skb->cb, sizeof(skb->cb));
	rts_info = IEEE80211_SKB_CB(skb);
	rts_info->control.rates[0].flags &= ~IEEE80211_TX_RC_USE_RTS_CTS;
	rts_info->control.rates[0].flags &= ~IEEE80211_TX_RC_USE_CTS_PROTECT;

	if (tx_info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
	rts_info->flags \|= IEEE80211_TX_CTL_NO_ACK;
	else
	rts_info->flags &= ~IEEE80211_TX_CTL_NO_ACK;

	/* Disable hardware encryption */
	rts_info->control.hw_key = NULL;

	/*
	* RTS/CTS frame should use the length of the frame plus any
	* encryption overhead that will be added by the hardware.
	*/
	data_length += rt2x00crypto_tx_overhead(rt2x00dev, skb);

	if (tx_info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
	ieee80211_ctstoself_get(rt2x00dev->hw, tx_info->control.vif,
	frag_skb->data, data_length, tx_info,
	(struct ieee80211_cts *)(skb->data));
	else
	ieee80211_rts_get(rt2x00dev->hw, tx_info->control.vif,
	frag_skb->data, data_length, tx_info,
	(struct ieee80211_rts *)(skb->data));

	retval = rt2x00queue_write_tx_frame(queue, skb, true);
	if (retval) {
	dev_kfree_skb_any(skb);
	WARNING(rt2x00dev, "Failed to send RTS/CTS frame.\n");
	}

	return retval;
	}

	int rt2x00mac_tx(struct ieee80211_hw hw, struct sk_buff skb)
	{
	struct rt2x00_dev *rt2x00dev = hw->priv;
	struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
	enum data_queue_qid qid = skb_get_queue_mapping(skb);
	struct data_queue *queue;

	/*
	* Mac80211 might be calling this function while we are trying
	* to remove the device or perhaps suspending it.
	* Note that we can only stop the TX queues inside the TX path
	* due to possible race conditions in mac80211.
	*/
	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
	goto exit_fail;

	/*
	* Determine which queue to put packet on.
	*/
	if (tx_info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM &&
	test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags))
	queue = rt2x00queue_get_queue(rt2x00dev, QID_ATIM);
	else
	queue = rt2x00queue_get_queue(rt2x00dev, qid);
	if (unlikely(!queue)) {
	ERROR(rt2x00dev,
	"Attempt to send packet over invalid queue %d.\n"
	"Please file bug report to %s.\n", qid, DRV_PROJECT);
	goto exit_fail;
	}

	/*
	* If CTS/RTS is required. create and queue that frame first.
	* Make sure we have at least enough entries available to send
	* this CTS/RTS frame as well as the data frame.
	* Note that when the driver has set the set_rts_threshold()
	* callback function it doesn't need software generation of
	* either RTS or CTS-to-self frame and handles everything
	* inside the hardware.
	*/
	if ((tx_info->control.rates[0].flags & (IEEE80211_TX_RC_USE_RTS_CTS \|
	IEEE80211_TX_RC_USE_CTS_PROTECT)) &&
	!rt2x00dev->ops->hw->set_rts_threshold) {
	if (rt2x00queue_available(queue) <= 1)
	goto exit_fail;

	if (rt2x00mac_tx_rts_cts(rt2x00dev, queue, skb))
	goto exit_fail;
	}

	if (rt2x00queue_write_tx_frame(queue, skb, false))
	goto exit_fail;

	if (rt2x00queue_threshold(queue))
	ieee80211_stop_queue(rt2x00dev->hw, qid);

	return NETDEV_TX_OK;

	exit_fail:
	ieee80211_stop_queue(rt2x00dev->hw, qid);
	dev_kfree_skb_any(skb);
	return NETDEV_TX_OK;
	}
	EXPORT_SYMBOL_GPL(rt2x00mac_tx);

	int rt2x00mac_start(struct ieee80211_hw *hw)
	{
	struct rt2x00_dev *rt2x00dev = hw->priv;

	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
	return 0;

	return rt2x00lib_start(rt2x00dev);
	}
	EXPORT_SYMBOL_GPL(rt2x00mac_start);

	void rt2x00mac_stop(struct ieee80211_hw *hw)
	{
	struct rt2x00_dev *rt2x00dev = hw->priv;

	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
	return;

	rt2x00lib_stop(rt2x00dev);
	}
	EXPORT_SYMBOL_GPL(rt2x00mac_stop);

	int rt2x00mac_add_interface(struct ieee80211_hw *hw,
	struct ieee80211_vif *vif)
	{
	struct rt2x00_dev *rt2x00dev = hw->priv;
	struct rt2x00_intf *intf = vif_to_intf(vif);
	struct data_queue *queue = rt2x00queue_get_queue(rt2x00dev, QID_BEACON);
	struct queue_entry *entry = NULL;
	unsigned int i;

	/*
	* Don't allow interfaces to be added
	* the device has disappeared.
	*/
	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) \|\|
	!test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
	return -ENODEV;

	switch (vif->type) {
	case NL80211_IFTYPE_AP:
	/*
	* We don't support mixed combinations of
	* sta and ap interfaces.
	*/
	if (rt2x00dev->intf_sta_count)
	return -ENOBUFS;

	/*
	* Check if we exceeded the maximum amount
	* of supported interfaces.
	*/
	if (rt2x00dev->intf_ap_count >= rt2x00dev->ops->max_ap_intf)
	return -ENOBUFS;

	break;
	case NL80211_IFTYPE_STATION:
	case NL80211_IFTYPE_ADHOC:
	case NL80211_IFTYPE_MESH_POINT:
	case NL80211_IFTYPE_WDS:
	/*
	* We don't support mixed combinations of
	* sta and ap interfaces.
	*/
	if (rt2x00dev->intf_ap_count)
	return -ENOBUFS;

	/*
	* Check if we exceeded the maximum amount
	* of supported interfaces.
	*/
	if (rt2x00dev->intf_sta_count >= rt2x00dev->ops->max_sta_intf)
	return -ENOBUFS;

	break;
	default:
	return -EINVAL;
	}

	/*
	* Loop through all beacon queues to find a free
	* entry. Since there are as much beacon entries
	* as the maximum interfaces, this search shouldn't
	* fail.
	*/
	for (i = 0; i < queue->limit; i++) {
	entry = &queue->entries[i];
	if (!test_and_set_bit(ENTRY_BCN_ASSIGNED, &entry->flags))
	break;
	}

	if (unlikely(i == queue->limit))
	return -ENOBUFS;

	/*
	* We are now absolutely sure the interface can be created,
	* increase interface count and start initialization.
	*/

	if (vif->type == NL80211_IFTYPE_AP)
	rt2x00dev->intf_ap_count++;
	else
	rt2x00dev->intf_sta_count++;

	spin_lock_init(&intf->lock);
	spin_lock_init(&intf->seqlock);
	mutex_init(&intf->beacon_skb_mutex);
	intf->beacon = entry;

	/*
	* The MAC adddress must be configured after the device
	* has been initialized. Otherwise the device can reset
	* the MAC registers.
	* The BSSID address must only be configured in AP mode,
	* however we should not send an empty BSSID address for
	* STA interfaces at this time, since this can cause
	* invalid behavior in the device.
	*/
	memcpy(&intf->mac, vif->addr, ETH_ALEN);
	if (vif->type == NL80211_IFTYPE_AP) {
	memcpy(&intf->bssid, vif->addr, ETH_ALEN);
	rt2x00lib_config_intf(rt2x00dev, intf, vif->type,
	intf->mac, intf->bssid);
	} else {
	rt2x00lib_config_intf(rt2x00dev, intf, vif->type,
	intf->mac, NULL);
	}

	/*
	* Some filters depend on the current working mode. We can force
	* an update during the next configure_filter() run by mac80211 by
	* resetting the current packet_filter state.
	*/
	rt2x00dev->packet_filter = 0;

	return 0;
	}
	EXPORT_SYMBOL_GPL(rt2x00mac_add_interface);

	void rt2x00mac_remove_interface(struct ieee80211_hw *hw,
	struct ieee80211_vif *vif)
	{
	struct rt2x00_dev *rt2x00dev = hw->priv;
	struct rt2x00_intf *intf = vif_to_intf(vif);

	/*
	* Don't allow interfaces to be remove while
	* either the device has disappeared or when
	* no interface is present.
	*/
	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags) \|\|
	(vif->type == NL80211_IFTYPE_AP && !rt2x00dev->intf_ap_count) \|\|
	(vif->type != NL80211_IFTYPE_AP && !rt2x00dev->intf_sta_count))
	return;

	if (vif->type == NL80211_IFTYPE_AP)
	rt2x00dev->intf_ap_count--;
	else
	rt2x00dev->intf_sta_count--;

	/*
	* Release beacon entry so it is available for
	* new interfaces again.
	*/
	clear_bit(ENTRY_BCN_ASSIGNED, &intf->beacon->flags);

	/*
	* Make sure the bssid and mac address registers
	* are cleared to prevent false ACKing of frames.
	*/
	rt2x00lib_config_intf(rt2x00dev, intf,
	NL80211_IFTYPE_UNSPECIFIED, NULL, NULL);
	}
	EXPORT_SYMBOL_GPL(rt2x00mac_remove_interface);

	int rt2x00mac_config(struct ieee80211_hw *hw, u32 changed)
	{
	struct rt2x00_dev *rt2x00dev = hw->priv;
	struct ieee80211_conf *conf = &hw->conf;

	/*
	* mac80211 might be calling this function while we are trying
	* to remove the device or perhaps suspending it.
	*/
	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
	return 0;

	/*
	* Some configuration parameters (e.g. channel and antenna values) can
	* only be set when the radio is enabled, but do require the RX to
	* be off. During this period we should keep link tuning enabled,
	* if for any reason the link tuner must be reset, this will be
	* handled by rt2x00lib_config().
	*/
	rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF_LINK);

	/*
	* When we've just turned on the radio, we want to reprogram
	* everything to ensure a consistent state
	*/
	rt2x00lib_config(rt2x00dev, conf, changed);

	/*
	* After the radio has been enabled we need to configure
	* the antenna to the default settings. rt2x00lib_config_antenna()
	* should determine if any action should be taken based on
	* checking if diversity has been enabled or no antenna changes
	* have been made since the last configuration change.
	*/
	rt2x00lib_config_antenna(rt2x00dev, rt2x00dev->default_ant);

	/* Turn RX back on */
	rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON_LINK);

	return 0;
	}
	EXPORT_SYMBOL_GPL(rt2x00mac_config);

	void rt2x00mac_configure_filter(struct ieee80211_hw *hw,
	unsigned int changed_flags,
	unsigned int *total_flags,
	u64 multicast)
	{
	struct rt2x00_dev *rt2x00dev = hw->priv;

	/*
	* Mask off any flags we are going to ignore
	* from the total_flags field.
	*/
	*total_flags &=
	FIF_ALLMULTI \|
	FIF_FCSFAIL \|
	FIF_PLCPFAIL \|
	FIF_CONTROL \|
	FIF_PSPOLL \|
	FIF_OTHER_BSS \|
	FIF_PROMISC_IN_BSS;

	/*
	* Apply some rules to the filters:
	* - Some filters imply different filters to be set.
	* - Some things we can't filter out at all.
	* - Multicast filter seems to kill broadcast traffic so never use it.
	*/
	*total_flags \|= FIF_ALLMULTI;
	if (*total_flags & FIF_OTHER_BSS \|\|
	*total_flags & FIF_PROMISC_IN_BSS)
	*total_flags \|= FIF_PROMISC_IN_BSS \| FIF_OTHER_BSS;

	/*
	* If the device has a single filter for all control frames,
	* FIF_CONTROL and FIF_PSPOLL flags imply each other.
	* And if the device has more than one filter for control frames
	* of different types, but has no a separate filter for PS Poll frames,
	* FIF_CONTROL flag implies FIF_PSPOLL.
	*/
	if (!test_bit(DRIVER_SUPPORT_CONTROL_FILTERS, &rt2x00dev->flags)) {
	if (total_flags & FIF_CONTROL \|\| total_flags & FIF_PSPOLL)
	*total_flags \|= FIF_CONTROL \| FIF_PSPOLL;
	}
	if (!test_bit(DRIVER_SUPPORT_CONTROL_FILTER_PSPOLL, &rt2x00dev->flags)) {
	if (*total_flags & FIF_CONTROL)
	*total_flags \|= FIF_PSPOLL;
	}

	/*
	* Check if there is any work left for us.
	*/
	if (rt2x00dev->packet_filter == *total_flags)
	return;
	rt2x00dev->packet_filter = *total_flags;

	rt2x00dev->ops->lib->config_filter(rt2x00dev, *total_flags);
	}
	EXPORT_SYMBOL_GPL(rt2x00mac_configure_filter);

	static void rt2x00mac_set_tim_iter(void data, u8 mac,
	struct ieee80211_vif *vif)
	{
	struct rt2x00_intf *intf = vif_to_intf(vif);

	if (vif->type != NL80211_IFTYPE_AP &&
	vif->type != NL80211_IFTYPE_ADHOC &&
	vif->type != NL80211_IFTYPE_MESH_POINT &&
	vif->type != NL80211_IFTYPE_WDS)
	return;

	spin_lock(&intf->lock);
	intf->delayed_flags \|= DELAYED_UPDATE_BEACON;
	spin_unlock(&intf->lock);
	}

	int rt2x00mac_set_tim(struct ieee80211_hw hw, struct ieee80211_sta sta,
	bool set)
	{
	struct rt2x00_dev *rt2x00dev = hw->priv;

	if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
	return 0;

	ieee80211_iterate_active_interfaces_atomic(rt2x00dev->hw,
	rt2x00mac_set_tim_iter,
	rt2x00dev);

	/* queue work to upodate the beacon template */
	ieee80211_queue_work(rt2x00dev->hw, &rt2x00dev->intf_work);
	return 0;
	}
	EXPORT_SYMBOL_GPL(rt2x00mac_set_tim);

	#ifdef CONFIG_RT2X00_LIB_CRYPTO
	static void memcpy_tkip(struct rt2x00lib_crypto crypto, u8 key, u8 key_len)
	{
	if (key_len > NL80211_TKIP_DATA_OFFSET_ENCR_KEY)
	memcpy(&crypto->key,
	&key[NL80211_TKIP_DATA_OFFSET_ENCR_KEY],
	sizeof(crypto->key));

	if (key_len > NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY)
	memcpy(&crypto->tx_mic,
	&key[NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY],
	sizeof(crypto->tx_mic));

	if (key_len > NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY)
	memcpy(&crypto->rx_mic,
	&key[NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY],
	sizeof(crypto->rx_mic));
	}

	int rt2x00mac_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
	struct ieee80211_vif vif, struct ieee80211_sta sta,
	struct ieee80211_key_conf *key)
	{
	struct rt2x00_dev *rt2x00dev = hw->priv;
	struct rt2x00_intf *intf = vif_to_intf(vif);
	int (set_key) (struct rt2x00_dev rt2x00dev,
	struct rt2x00lib_crypto *crypto,
	struct ieee80211_key_conf *key);
	struct rt2x00lib_crypto crypto;
	static const u8 bcast_addr[ETH_ALEN] =
	{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, };

	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
	return 0;
	else if (!test_bit(CONFIG_SUPPORT_HW_CRYPTO, &rt2x00dev->flags))
	return -EOPNOTSUPP;
	else if (key->keylen > 32)
	return -ENOSPC;

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

	/*
	* When in STA mode, bssidx is always 0 otherwise local_address[5]
	* contains the bss number, see BSS_ID_MASK comments for details.
	*/
	if (rt2x00dev->intf_sta_count)
	crypto.bssidx = 0;
	else
	crypto.bssidx = intf->mac[5] & (rt2x00dev->ops->max_ap_intf - 1);

	crypto.cipher = rt2x00crypto_key_to_cipher(key);
	if (crypto.cipher == CIPHER_NONE)
	return -EOPNOTSUPP;

	crypto.cmd = cmd;

	if (sta) {
	/* some drivers need the AID */
	crypto.aid = sta->aid;
	crypto.address = sta->addr;
	} else
	crypto.address = bcast_addr;

	if (crypto.cipher == CIPHER_TKIP)
	memcpy_tkip(&crypto, &key->key[0], key->keylen);
	else
	memcpy(&crypto.key, &key->key[0], key->keylen);
	/*
	* Each BSS has a maximum of 4 shared keys.
	* Shared key index values:
	* 0) BSS0 key0
	* 1) BSS0 key1
	* ...
	* 4) BSS1 key0
	* ...
	* 8) BSS2 key0
	* ...
	* Both pairwise as shared key indeces are determined by
	* driver. This is required because the hardware requires
	* keys to be assigned in correct order (When key 1 is
	* provided but key 0 is not, then the key is not found
	* by the hardware during RX).
	*/
	if (cmd == SET_KEY)
	key->hw_key_idx = 0;

	if (key->flags & IEEE80211_KEY_FLAG_PAIRWISE)
	set_key = rt2x00dev->ops->lib->config_pairwise_key;
	else
	set_key = rt2x00dev->ops->lib->config_shared_key;

	if (!set_key)
	return -EOPNOTSUPP;

	return set_key(rt2x00dev, &crypto, key);
	}
	EXPORT_SYMBOL_GPL(rt2x00mac_set_key);
	#endif /* CONFIG_RT2X00_LIB_CRYPTO */

	void rt2x00mac_sw_scan_start(struct ieee80211_hw *hw)
	{
	struct rt2x00_dev *rt2x00dev = hw->priv;
	__set_bit(DEVICE_STATE_SCANNING, &rt2x00dev->flags);
	rt2x00link_stop_tuner(rt2x00dev);
	}
	EXPORT_SYMBOL_GPL(rt2x00mac_sw_scan_start);

	void rt2x00mac_sw_scan_complete(struct ieee80211_hw *hw)
	{
	struct rt2x00_dev *rt2x00dev = hw->priv;
	__clear_bit(DEVICE_STATE_SCANNING, &rt2x00dev->flags);
	rt2x00link_start_tuner(rt2x00dev);
	}
	EXPORT_SYMBOL_GPL(rt2x00mac_sw_scan_complete);

	int rt2x00mac_get_stats(struct ieee80211_hw *hw,
	struct ieee80211_low_level_stats *stats)
	{
	struct rt2x00_dev *rt2x00dev = hw->priv;

	/*
	* The dot11ACKFailureCount, dot11RTSFailureCount and
	* dot11RTSSuccessCount are updated in interrupt time.
	* dot11FCSErrorCount is updated in the link tuner.
	*/
	memcpy(stats, &rt2x00dev->low_level_stats, sizeof(*stats));

	return 0;
	}
	EXPORT_SYMBOL_GPL(rt2x00mac_get_stats);

	void rt2x00mac_bss_info_changed(struct ieee80211_hw *hw,
	struct ieee80211_vif *vif,
	struct ieee80211_bss_conf *bss_conf,
	u32 changes)
	{
	struct rt2x00_dev *rt2x00dev = hw->priv;
	struct rt2x00_intf *intf = vif_to_intf(vif);

	/*
	* mac80211 might be calling this function while we are trying
	* to remove the device or perhaps suspending it.
	*/
	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
	return;

	spin_lock(&intf->lock);

	/*
	* conf->bssid can be NULL if coming from the internal
	* beacon update routine.
	*/
	if (changes & BSS_CHANGED_BSSID)
	memcpy(&intf->bssid, bss_conf->bssid, ETH_ALEN);

	spin_unlock(&intf->lock);

	/*
	* Call rt2x00_config_intf() outside of the spinlock context since
	* the call will sleep for USB drivers. By using the ieee80211_if_conf
	* values as arguments we make keep access to rt2x00_intf thread safe
	* even without the lock.
	*/
	if (changes & BSS_CHANGED_BSSID)
	rt2x00lib_config_intf(rt2x00dev, intf, vif->type, NULL,
	bss_conf->bssid);

	/*
	* Update the beacon.
	*/
	if (changes & (BSS_CHANGED_BEACON \| BSS_CHANGED_BEACON_ENABLED))
	rt2x00queue_update_beacon(rt2x00dev, vif,
	bss_conf->enable_beacon);

	/*
	* When the association status has changed we must reset the link
	* tuner counter. This is because some drivers determine if they
	* should perform link tuning based on the number of seconds
	* while associated or not associated.
	*/
	if (changes & BSS_CHANGED_ASSOC) {
	rt2x00dev->link.count = 0;

	if (bss_conf->assoc)
	rt2x00dev->intf_associated++;
	else
	rt2x00dev->intf_associated--;

	rt2x00leds_led_assoc(rt2x00dev, !!rt2x00dev->intf_associated);
	}

	/*
	* When the erp information has changed, we should perform
	* additional configuration steps. For all other changes we are done.
	*/
	if (changes & ~(BSS_CHANGED_ASSOC \| BSS_CHANGED_HT))
	rt2x00lib_config_erp(rt2x00dev, intf, bss_conf);
	}
	EXPORT_SYMBOL_GPL(rt2x00mac_bss_info_changed);

	int rt2x00mac_conf_tx(struct ieee80211_hw *hw, u16 queue_idx,
	const struct ieee80211_tx_queue_params *params)
	{
	struct rt2x00_dev *rt2x00dev = hw->priv;
	struct data_queue *queue;

	queue = rt2x00queue_get_queue(rt2x00dev, queue_idx);
	if (unlikely(!queue))
	return -EINVAL;

	/*
	* The passed variables are stored as real value ((2^n)-1).
	* Ralink registers require to know the bit number 'n'.
	*/
	if (params->cw_min > 0)
	queue->cw_min = fls(params->cw_min);
	else
	queue->cw_min = 5; /* cw_min: 2^5 = 32. */

	if (params->cw_max > 0)
	queue->cw_max = fls(params->cw_max);
	else
	queue->cw_max = 10; /* cw_min: 2^10 = 1024. */

	queue->aifs = params->aifs;
	queue->txop = params->txop;

	INFO(rt2x00dev,
	"Configured TX queue %d - CWmin: %d, CWmax: %d, Aifs: %d, TXop: %d.\n",
	queue_idx, queue->cw_min, queue->cw_max, queue->aifs, queue->txop);

	return 0;
	}
	EXPORT_SYMBOL_GPL(rt2x00mac_conf_tx);

	void rt2x00mac_rfkill_poll(struct ieee80211_hw *hw)
	{
	struct rt2x00_dev *rt2x00dev = hw->priv;
	bool active = !!rt2x00dev->ops->lib->rfkill_poll(rt2x00dev);

	wiphy_rfkill_set_hw_state(hw->wiphy, !active);
	}
	EXPORT_SYMBOL_GPL(rt2x00mac_rfkill_poll);