drivers/net/wireless/rt2x00/rt2x00mac.c - kernel/msm-5.4 - Gitiles

 /*
 	Copyright (C) 2004 - 2007 rt2x00 SourceForge Project
 	<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_ring *ring,
 				struct sk_buff *frag_skb,
 				struct ieee80211_tx_control *control)
 {
 	struct sk_buff *skb;
 	int size;

 	if (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
 		size = sizeof(struct ieee80211_cts);
 	else
 		size = sizeof(struct ieee80211_rts);

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

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

 	if (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
 		ieee80211_ctstoself_get(rt2x00dev->hw, rt2x00dev->interface.id,
 					frag_skb->data, frag_skb->len, control,
 					(struct ieee80211_cts *)(skb->data));
 	else
 		ieee80211_rts_get(rt2x00dev->hw, rt2x00dev->interface.id,
 				  frag_skb->data, frag_skb->len, control,
 				  (struct ieee80211_rts *)(skb->data));

 	if (rt2x00dev->ops->lib->write_tx_data(rt2x00dev, ring, skb, control)) {
 		WARNING(rt2x00dev, "Failed to send RTS/CTS frame.\n");
 		return NETDEV_TX_BUSY;
 	}

 	return NETDEV_TX_OK;
 }

 int rt2x00mac_tx(struct ieee80211_hw *hw, struct sk_buff *skb,
 		 struct ieee80211_tx_control *control)
 {
 	struct rt2x00_dev *rt2x00dev = hw->priv;
 	struct ieee80211_hdr *ieee80211hdr = (struct ieee80211_hdr *)skb->data;
 	struct data_ring *ring;
 	u16 frame_control;

 	/*
 	 * 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_PRESENT, &rt2x00dev->flags)) {
 		ieee80211_stop_queues(hw);
 		return 0;
 	}

 	/*
 	 * Determine which ring to put packet on.
 	 */
 	ring = rt2x00lib_get_ring(rt2x00dev, control->queue);
 	if (unlikely(!ring)) {
 		ERROR(rt2x00dev,
 		      "Attempt to send packet over invalid queue %d.\n"
 		      "Please file bug report to %s.\n",
 		      control->queue, DRV_PROJECT);
 		dev_kfree_skb_any(skb);
 		return NETDEV_TX_OK;
 	}

 	/*
 	 * If CTS/RTS is required. and this frame is not CTS or RTS,
 	 * create and queue that frame first. But make sure we have
 	 * at least enough entries available to send this CTS/RTS
 	 * frame as well as the data frame.
 	 */
 	frame_control = le16_to_cpu(ieee80211hdr->frame_control);
 	if (!is_rts_frame(frame_control) && !is_cts_frame(frame_control) &&
 	    (control->flags & (IEEE80211_TXCTL_USE_RTS_CTS |
 			       IEEE80211_TXCTL_USE_CTS_PROTECT))) {
 		if (rt2x00_ring_free(ring) <= 1)
 			return NETDEV_TX_BUSY;

 		if (rt2x00mac_tx_rts_cts(rt2x00dev, ring, skb, control))
 			return NETDEV_TX_BUSY;
 	}

 	if (rt2x00dev->ops->lib->write_tx_data(rt2x00dev, ring, skb, control))
 		return NETDEV_TX_BUSY;

 	if (rt2x00dev->ops->lib->kick_tx_queue)
 		rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, control->queue);

 	return NETDEV_TX_OK;
 }
 EXPORT_SYMBOL_GPL(rt2x00mac_tx);

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

 	if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags) ||
 	    test_bit(DEVICE_STARTED, &rt2x00dev->flags))
 		return 0;

 	/*
 	 * If this is the first interface which is added,
 	 * we should load the firmware now.
 	 */
 	if (test_bit(DRIVER_REQUIRE_FIRMWARE, &rt2x00dev->flags)) {
 		status = rt2x00lib_load_firmware(rt2x00dev);
 		if (status)
 			return status;
 	}

 	/*
 	 * Initialize the device.
 	 */
 	status = rt2x00lib_initialize(rt2x00dev);
 	if (status)
 		return status;

 	/*
 	 * Enable radio.
 	 */
 	status = rt2x00lib_enable_radio(rt2x00dev);
 	if (status) {
 		rt2x00lib_uninitialize(rt2x00dev);
 		return status;
 	}

 	__set_bit(DEVICE_STARTED, &rt2x00dev->flags);

 	return 0;
 }
 EXPORT_SYMBOL_GPL(rt2x00mac_start);

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

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

 	/*
 	 * Perhaps we can add something smarter here,
 	 * but for now just disabling the radio should do.
 	 */
 	rt2x00lib_disable_radio(rt2x00dev);

 	__clear_bit(DEVICE_STARTED, &rt2x00dev->flags);
 }
 EXPORT_SYMBOL_GPL(rt2x00mac_stop);

 int rt2x00mac_add_interface(struct ieee80211_hw *hw,
 			    struct ieee80211_if_init_conf *conf)
 {
 	struct rt2x00_dev *rt2x00dev = hw->priv;
 	struct interface *intf = &rt2x00dev->interface;

 	/* FIXME: Beaconing is broken in rt2x00. */
 	if (conf->type == IEEE80211_IF_TYPE_IBSS ||
 	    conf->type == IEEE80211_IF_TYPE_AP) {
 		ERROR(rt2x00dev,
 		      "rt2x00 does not support Adhoc or Master mode");
 		return -EOPNOTSUPP;
 	}

 	/*
 	 * Don't allow interfaces to be added while
 	 * either the device has disappeared or when
 	 * another interface is already present.
 	 */
 	if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags) ||
 	    is_interface_present(intf))
 		return -ENOBUFS;

 	intf->id = conf->if_id;
 	intf->type = conf->type;
 	if (conf->type == IEEE80211_IF_TYPE_AP)
 		memcpy(&intf->bssid, conf->mac_addr, ETH_ALEN);
 	memcpy(&intf->mac, conf->mac_addr, ETH_ALEN);

 	/*
 	 * The MAC adddress must be configured after the device
 	 * has been initialized. Otherwise the device can reset
 	 * the MAC registers.
 	 */
 	rt2x00lib_config_mac_addr(rt2x00dev, intf->mac);
 	rt2x00lib_config_type(rt2x00dev, conf->type);

 	return 0;
 }
 EXPORT_SYMBOL_GPL(rt2x00mac_add_interface);

 void rt2x00mac_remove_interface(struct ieee80211_hw *hw,
 				struct ieee80211_if_init_conf *conf)
 {
 	struct rt2x00_dev *rt2x00dev = hw->priv;
 	struct interface *intf = &rt2x00dev->interface;

 	/*
 	 * Don't allow interfaces to be remove while
 	 * either the device has disappeared or when
 	 * no interface is present.
 	 */
 	if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags) ||
 	    !is_interface_present(intf))
 		return;

 	intf->id = 0;
 	intf->type = INVALID_INTERFACE;
 	memset(&intf->bssid, 0x00, ETH_ALEN);
 	memset(&intf->mac, 0x00, ETH_ALEN);

 	/*
 	 * Make sure the bssid and mac address registers
 	 * are cleared to prevent false ACKing of frames.
 	 */
 	rt2x00lib_config_mac_addr(rt2x00dev, intf->mac);
 	rt2x00lib_config_bssid(rt2x00dev, intf->bssid);
 	rt2x00lib_config_type(rt2x00dev, intf->type);
 }
 EXPORT_SYMBOL_GPL(rt2x00mac_remove_interface);

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

 	/*
 	 * Mac80211 might be calling this function while we are trying
 	 * to remove the device or perhaps suspending it.
 	 */
 	if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
 		return 0;

 	/*
 	 * Check if we need to disable the radio,
 	 * if this is not the case, at least the RX must be disabled.
 	 */
 	if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags)) {
 		if (!conf->radio_enabled)
 			rt2x00lib_disable_radio(rt2x00dev);
 		else
 			rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF);
 	}

 	rt2x00lib_config(rt2x00dev, conf, 0);

 	/*
 	 * Reenable RX only if the radio should be on.
 	 */
 	if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
 		rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON);
 	else if (conf->radio_enabled)
 		return rt2x00lib_enable_radio(rt2x00dev);

 	return 0;
 }
 EXPORT_SYMBOL_GPL(rt2x00mac_config);

 int rt2x00mac_config_interface(struct ieee80211_hw *hw, int if_id,
 			       struct ieee80211_if_conf *conf)
 {
 	struct rt2x00_dev *rt2x00dev = hw->priv;
 	struct interface *intf = &rt2x00dev->interface;
 	int status;

 	/*
 	 * Mac80211 might be calling this function while we are trying
 	 * to remove the device or perhaps suspending it.
 	 */
 	if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
 		return 0;

 	/*
 	 * If the given type does not match the configured type,
 	 * there has been a problem.
 	 */
 	if (conf->type != intf->type)
 		return -EINVAL;

 	/*
 	 * If the interface does not work in master mode,
 	 * then the bssid value in the interface structure
 	 * should now be set.
 	 */
 	if (conf->type != IEEE80211_IF_TYPE_AP)
 		memcpy(&intf->bssid, conf->bssid, ETH_ALEN);
 	rt2x00lib_config_bssid(rt2x00dev, intf->bssid);

 	/*
 	 * We only need to initialize the beacon when master mode is enabled.
 	 */
 	if (conf->type != IEEE80211_IF_TYPE_AP || !conf->beacon)
 		return 0;

 	status = rt2x00dev->ops->hw->beacon_update(rt2x00dev->hw,
 						   conf->beacon,
 						   conf->beacon_control);
 	if (status)
 		dev_kfree_skb(conf->beacon);

 	return status;
 }
 EXPORT_SYMBOL_GPL(rt2x00mac_config_interface);

 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);

 int rt2x00mac_get_tx_stats(struct ieee80211_hw *hw,
 			   struct ieee80211_tx_queue_stats *stats)
 {
 	struct rt2x00_dev *rt2x00dev = hw->priv;
 	unsigned int i;

 	for (i = 0; i < hw->queues; i++)
 		memcpy(&stats->data[i], &rt2x00dev->tx[i].stats,
 		       sizeof(rt2x00dev->tx[i].stats));

 	return 0;
 }
 EXPORT_SYMBOL_GPL(rt2x00mac_get_tx_stats);

 void rt2x00mac_erp_ie_changed(struct ieee80211_hw *hw, u8 changes,
 			      int cts_protection, int preamble)
 {
 	struct rt2x00_dev *rt2x00dev = hw->priv;
 	int short_preamble;
 	int ack_timeout;
 	int ack_consume_time;
 	int difs;

 	/*
 	 * We only support changing preamble mode.
 	 */
 	if (!(changes & IEEE80211_ERP_CHANGE_PREAMBLE))
 		return;

 	short_preamble = !preamble;
 	preamble = !!(preamble) ? PREAMBLE : SHORT_PREAMBLE;

 	difs = (hw->conf.flags & IEEE80211_CONF_SHORT_SLOT_TIME) ?
 		SHORT_DIFS : DIFS;
 	ack_timeout = difs + PLCP + preamble + get_duration(ACK_SIZE, 10);

 	ack_consume_time = SIFS + PLCP + preamble + get_duration(ACK_SIZE, 10);

 	if (short_preamble)
 		__set_bit(CONFIG_SHORT_PREAMBLE, &rt2x00dev->flags);
 	else
 		__clear_bit(CONFIG_SHORT_PREAMBLE, &rt2x00dev->flags);

 	rt2x00dev->ops->lib->config_preamble(rt2x00dev, short_preamble,
 					     ack_timeout, ack_consume_time);
 }
 EXPORT_SYMBOL_GPL(rt2x00mac_erp_ie_changed);

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

 	ring = rt2x00lib_get_ring(rt2x00dev, queue);
 	if (unlikely(!ring))
 		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)
 		ring->tx_params.cw_min = fls(params->cw_min);
 	else
 		ring->tx_params.cw_min = 5; /* cw_min: 2^5 = 32. */

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

 	if (params->aifs)
 		ring->tx_params.aifs = params->aifs;
 	else
 		ring->tx_params.aifs = 2;

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

 	return 0;
 }
 EXPORT_SYMBOL_GPL(rt2x00mac_conf_tx);
	/*
	Copyright (C) 2004 - 2007 rt2x00 SourceForge Project
	<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_ring *ring,
	struct sk_buff *frag_skb,
	struct ieee80211_tx_control *control)
	{
	struct sk_buff *skb;
	int size;

	if (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
	size = sizeof(struct ieee80211_cts);
	else
	size = sizeof(struct ieee80211_rts);

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

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

	if (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
	ieee80211_ctstoself_get(rt2x00dev->hw, rt2x00dev->interface.id,
	frag_skb->data, frag_skb->len, control,
	(struct ieee80211_cts *)(skb->data));
	else
	ieee80211_rts_get(rt2x00dev->hw, rt2x00dev->interface.id,
	frag_skb->data, frag_skb->len, control,
	(struct ieee80211_rts *)(skb->data));

	if (rt2x00dev->ops->lib->write_tx_data(rt2x00dev, ring, skb, control)) {
	WARNING(rt2x00dev, "Failed to send RTS/CTS frame.\n");
	return NETDEV_TX_BUSY;
	}

	return NETDEV_TX_OK;
	}

	int rt2x00mac_tx(struct ieee80211_hw hw, struct sk_buff skb,
	struct ieee80211_tx_control *control)
	{
	struct rt2x00_dev *rt2x00dev = hw->priv;
	struct ieee80211_hdr ieee80211hdr = (struct ieee80211_hdr )skb->data;
	struct data_ring *ring;
	u16 frame_control;

	/*
	* 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_PRESENT, &rt2x00dev->flags)) {
	ieee80211_stop_queues(hw);
	return 0;
	}

	/*
	* Determine which ring to put packet on.
	*/
	ring = rt2x00lib_get_ring(rt2x00dev, control->queue);
	if (unlikely(!ring)) {
	ERROR(rt2x00dev,
	"Attempt to send packet over invalid queue %d.\n"
	"Please file bug report to %s.\n",
	control->queue, DRV_PROJECT);
	dev_kfree_skb_any(skb);
	return NETDEV_TX_OK;
	}

	/*
	* If CTS/RTS is required. and this frame is not CTS or RTS,
	* create and queue that frame first. But make sure we have
	* at least enough entries available to send this CTS/RTS
	* frame as well as the data frame.
	*/
	frame_control = le16_to_cpu(ieee80211hdr->frame_control);
	if (!is_rts_frame(frame_control) && !is_cts_frame(frame_control) &&
	(control->flags & (IEEE80211_TXCTL_USE_RTS_CTS \|
	IEEE80211_TXCTL_USE_CTS_PROTECT))) {
	if (rt2x00_ring_free(ring) <= 1)
	return NETDEV_TX_BUSY;

	if (rt2x00mac_tx_rts_cts(rt2x00dev, ring, skb, control))
	return NETDEV_TX_BUSY;
	}

	if (rt2x00dev->ops->lib->write_tx_data(rt2x00dev, ring, skb, control))
	return NETDEV_TX_BUSY;

	if (rt2x00dev->ops->lib->kick_tx_queue)
	rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, control->queue);

	return NETDEV_TX_OK;
	}
	EXPORT_SYMBOL_GPL(rt2x00mac_tx);

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

	if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags) \|\|
	test_bit(DEVICE_STARTED, &rt2x00dev->flags))
	return 0;

	/*
	* If this is the first interface which is added,
	* we should load the firmware now.
	*/
	if (test_bit(DRIVER_REQUIRE_FIRMWARE, &rt2x00dev->flags)) {
	status = rt2x00lib_load_firmware(rt2x00dev);
	if (status)
	return status;
	}

	/*
	* Initialize the device.
	*/
	status = rt2x00lib_initialize(rt2x00dev);
	if (status)
	return status;

	/*
	* Enable radio.
	*/
	status = rt2x00lib_enable_radio(rt2x00dev);
	if (status) {
	rt2x00lib_uninitialize(rt2x00dev);
	return status;
	}

	__set_bit(DEVICE_STARTED, &rt2x00dev->flags);

	return 0;
	}
	EXPORT_SYMBOL_GPL(rt2x00mac_start);

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

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

	/*
	* Perhaps we can add something smarter here,
	* but for now just disabling the radio should do.
	*/
	rt2x00lib_disable_radio(rt2x00dev);

	__clear_bit(DEVICE_STARTED, &rt2x00dev->flags);
	}
	EXPORT_SYMBOL_GPL(rt2x00mac_stop);

	int rt2x00mac_add_interface(struct ieee80211_hw *hw,
	struct ieee80211_if_init_conf *conf)
	{
	struct rt2x00_dev *rt2x00dev = hw->priv;
	struct interface *intf = &rt2x00dev->interface;

	/* FIXME: Beaconing is broken in rt2x00. */
	if (conf->type == IEEE80211_IF_TYPE_IBSS \|\|
	conf->type == IEEE80211_IF_TYPE_AP) {
	ERROR(rt2x00dev,
	"rt2x00 does not support Adhoc or Master mode");
	return -EOPNOTSUPP;
	}

	/*
	* Don't allow interfaces to be added while
	* either the device has disappeared or when
	* another interface is already present.
	*/
	if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags) \|\|
	is_interface_present(intf))
	return -ENOBUFS;

	intf->id = conf->if_id;
	intf->type = conf->type;
	if (conf->type == IEEE80211_IF_TYPE_AP)
	memcpy(&intf->bssid, conf->mac_addr, ETH_ALEN);
	memcpy(&intf->mac, conf->mac_addr, ETH_ALEN);

	/*
	* The MAC adddress must be configured after the device
	* has been initialized. Otherwise the device can reset
	* the MAC registers.
	*/
	rt2x00lib_config_mac_addr(rt2x00dev, intf->mac);
	rt2x00lib_config_type(rt2x00dev, conf->type);

	return 0;
	}
	EXPORT_SYMBOL_GPL(rt2x00mac_add_interface);

	void rt2x00mac_remove_interface(struct ieee80211_hw *hw,
	struct ieee80211_if_init_conf *conf)
	{
	struct rt2x00_dev *rt2x00dev = hw->priv;
	struct interface *intf = &rt2x00dev->interface;

	/*
	* Don't allow interfaces to be remove while
	* either the device has disappeared or when
	* no interface is present.
	*/
	if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags) \|\|
	!is_interface_present(intf))
	return;

	intf->id = 0;
	intf->type = INVALID_INTERFACE;
	memset(&intf->bssid, 0x00, ETH_ALEN);
	memset(&intf->mac, 0x00, ETH_ALEN);

	/*
	* Make sure the bssid and mac address registers
	* are cleared to prevent false ACKing of frames.
	*/
	rt2x00lib_config_mac_addr(rt2x00dev, intf->mac);
	rt2x00lib_config_bssid(rt2x00dev, intf->bssid);
	rt2x00lib_config_type(rt2x00dev, intf->type);
	}
	EXPORT_SYMBOL_GPL(rt2x00mac_remove_interface);

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

	/*
	* Mac80211 might be calling this function while we are trying
	* to remove the device or perhaps suspending it.
	*/
	if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
	return 0;

	/*
	* Check if we need to disable the radio,
	* if this is not the case, at least the RX must be disabled.
	*/
	if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags)) {
	if (!conf->radio_enabled)
	rt2x00lib_disable_radio(rt2x00dev);
	else
	rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF);
	}

	rt2x00lib_config(rt2x00dev, conf, 0);

	/*
	* Reenable RX only if the radio should be on.
	*/
	if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
	rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON);
	else if (conf->radio_enabled)
	return rt2x00lib_enable_radio(rt2x00dev);

	return 0;
	}
	EXPORT_SYMBOL_GPL(rt2x00mac_config);

	int rt2x00mac_config_interface(struct ieee80211_hw *hw, int if_id,
	struct ieee80211_if_conf *conf)
	{
	struct rt2x00_dev *rt2x00dev = hw->priv;
	struct interface *intf = &rt2x00dev->interface;
	int status;

	/*
	* Mac80211 might be calling this function while we are trying
	* to remove the device or perhaps suspending it.
	*/
	if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
	return 0;

	/*
	* If the given type does not match the configured type,
	* there has been a problem.
	*/
	if (conf->type != intf->type)
	return -EINVAL;

	/*
	* If the interface does not work in master mode,
	* then the bssid value in the interface structure
	* should now be set.
	*/
	if (conf->type != IEEE80211_IF_TYPE_AP)
	memcpy(&intf->bssid, conf->bssid, ETH_ALEN);
	rt2x00lib_config_bssid(rt2x00dev, intf->bssid);

	/*
	* We only need to initialize the beacon when master mode is enabled.
	*/
	if (conf->type != IEEE80211_IF_TYPE_AP \|\| !conf->beacon)
	return 0;

	status = rt2x00dev->ops->hw->beacon_update(rt2x00dev->hw,
	conf->beacon,
	conf->beacon_control);
	if (status)
	dev_kfree_skb(conf->beacon);

	return status;
	}
	EXPORT_SYMBOL_GPL(rt2x00mac_config_interface);

	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);

	int rt2x00mac_get_tx_stats(struct ieee80211_hw *hw,
	struct ieee80211_tx_queue_stats *stats)
	{
	struct rt2x00_dev *rt2x00dev = hw->priv;
	unsigned int i;

	for (i = 0; i < hw->queues; i++)
	memcpy(&stats->data[i], &rt2x00dev->tx[i].stats,
	sizeof(rt2x00dev->tx[i].stats));

	return 0;
	}
	EXPORT_SYMBOL_GPL(rt2x00mac_get_tx_stats);

	void rt2x00mac_erp_ie_changed(struct ieee80211_hw *hw, u8 changes,
	int cts_protection, int preamble)
	{
	struct rt2x00_dev *rt2x00dev = hw->priv;
	int short_preamble;
	int ack_timeout;
	int ack_consume_time;
	int difs;

	/*
	* We only support changing preamble mode.
	*/
	if (!(changes & IEEE80211_ERP_CHANGE_PREAMBLE))
	return;

	short_preamble = !preamble;
	preamble = !!(preamble) ? PREAMBLE : SHORT_PREAMBLE;

	difs = (hw->conf.flags & IEEE80211_CONF_SHORT_SLOT_TIME) ?
	SHORT_DIFS : DIFS;
	ack_timeout = difs + PLCP + preamble + get_duration(ACK_SIZE, 10);

	ack_consume_time = SIFS + PLCP + preamble + get_duration(ACK_SIZE, 10);

	if (short_preamble)
	__set_bit(CONFIG_SHORT_PREAMBLE, &rt2x00dev->flags);
	else
	__clear_bit(CONFIG_SHORT_PREAMBLE, &rt2x00dev->flags);

	rt2x00dev->ops->lib->config_preamble(rt2x00dev, short_preamble,
	ack_timeout, ack_consume_time);
	}
	EXPORT_SYMBOL_GPL(rt2x00mac_erp_ie_changed);

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

	ring = rt2x00lib_get_ring(rt2x00dev, queue);
	if (unlikely(!ring))
	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)
	ring->tx_params.cw_min = fls(params->cw_min);
	else
	ring->tx_params.cw_min = 5; /* cw_min: 2^5 = 32. */

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

	if (params->aifs)
	ring->tx_params.aifs = params->aifs;
	else
	ring->tx_params.aifs = 2;

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

	return 0;
	}
	EXPORT_SYMBOL_GPL(rt2x00mac_conf_tx);