[mirror_ubuntu-zesty-kernel.git] / drivers / net / wireless / rt2x00 / rt2x00mac.c

/*
	Copyright (C) 2004 - 2008 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_queue *queue,
				struct sk_buff *frag_skb,
				struct ieee80211_tx_control *control)
{
	struct skb_frame_desc *skbdesc;
	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, control->vif,
					frag_skb->data, frag_skb->len, control,
					(struct ieee80211_cts *)(skb->data));
	else
		ieee80211_rts_get(rt2x00dev->hw, control->vif,
				  frag_skb->data, frag_skb->len, control,
				  (struct ieee80211_rts *)(skb->data));

	/*
	 * Initialize skb descriptor
	 */
	skbdesc = get_skb_frame_desc(skb);
	memset(skbdesc, 0, sizeof(*skbdesc));
	skbdesc->flags |= FRAME_DESC_DRIVER_GENERATED;

	if (rt2x00dev->ops->lib->write_tx_data(rt2x00dev, queue, 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_queue *queue;
	struct skb_frame_desc *skbdesc;
	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 NETDEV_TX_OK;
	}

	/*
	 * Determine which queue to put packet on.
	 */
	if (control->flags & IEEE80211_TXCTL_SEND_AFTER_DTIM &&
	    test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags))
		queue = rt2x00queue_get_queue(rt2x00dev, RT2X00_BCN_QUEUE_ATIM);
	else
		queue = rt2x00queue_get_queue(rt2x00dev, control->queue);
	if (unlikely(!queue)) {
		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 (rt2x00queue_available(queue) <= 1) {
			ieee80211_stop_queue(rt2x00dev->hw, control->queue);
			return NETDEV_TX_BUSY;
		}

		if (rt2x00mac_tx_rts_cts(rt2x00dev, queue, skb, control)) {
			ieee80211_stop_queue(rt2x00dev->hw, control->queue);
			return NETDEV_TX_BUSY;
		}
	}

	/*
	 * Initialize skb descriptor
	 */
	skbdesc = get_skb_frame_desc(skb);
	memset(skbdesc, 0, sizeof(*skbdesc));

	if (rt2x00dev->ops->lib->write_tx_data(rt2x00dev, queue, skb, control)) {
		ieee80211_stop_queue(rt2x00dev->hw, control->queue);
		return NETDEV_TX_BUSY;
	}

	if (rt2x00queue_full(queue))
		ieee80211_stop_queue(rt2x00dev->hw, control->queue);

	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;

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

	rt2x00lib_stop(rt2x00dev);
}
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 rt2x00_intf *intf = vif_to_intf(conf->vif);
	struct data_queue *queue =
	    rt2x00queue_get_queue(rt2x00dev, RT2X00_BCN_QUEUE_BEACON);
	struct queue_entry *entry = NULL;
	unsigned int i;

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

	/*
	 * When we don't support mixed interfaces (a combination
	 * of sta and ap virtual interfaces) then we can only
	 * add this interface when the rival interface count is 0.
	 */
	if (!test_bit(DRIVER_SUPPORT_MIXED_INTERFACES, &rt2x00dev->flags) &&
	    ((conf->type == IEEE80211_IF_TYPE_AP && rt2x00dev->intf_sta_count) ||
	     (conf->type != IEEE80211_IF_TYPE_AP && rt2x00dev->intf_ap_count)))
		return -ENOBUFS;

	/*
	 * Check if we exceeded the maximum amount of supported interfaces.
	 */
	if ((conf->type == IEEE80211_IF_TYPE_AP &&
	     rt2x00dev->intf_ap_count >= rt2x00dev->ops->max_ap_intf) ||
	    (conf->type != IEEE80211_IF_TYPE_AP &&
	     rt2x00dev->intf_sta_count >= rt2x00dev->ops->max_sta_intf))
		return -ENOBUFS;

	/*
	 * 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 (conf->type == IEEE80211_IF_TYPE_AP)
		rt2x00dev->intf_ap_count++;
	else
		rt2x00dev->intf_sta_count++;

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

	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_intf(rt2x00dev, intf, conf->type, intf->mac, NULL);

	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 rt2x00_intf *intf = vif_to_intf(conf->vif);

	/*
	 * 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) ||
	    (conf->type == IEEE80211_IF_TYPE_AP && !rt2x00dev->intf_ap_count) ||
	    (conf->type != IEEE80211_IF_TYPE_AP && !rt2x00dev->intf_sta_count))
		return;

	if (conf->type == IEEE80211_IF_TYPE_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,
			      IEEE80211_IF_TYPE_INVALID, NULL, NULL);
}
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,
			       struct ieee80211_vif *vif,
			       struct ieee80211_if_conf *conf)
{
	struct rt2x00_dev *rt2x00dev = hw->priv;
	struct rt2x00_intf *intf = vif_to_intf(vif);
	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;

	spin_lock(&intf->lock);

	/*
	 * 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);

	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.
	 */
	rt2x00lib_config_intf(rt2x00dev, intf, conf->type, NULL, conf->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++) {
		stats->data[i].len = rt2x00dev->tx[i].length;
		stats->data[i].limit = rt2x00dev->tx[i].limit;
		stats->data[i].count = rt2x00dev->tx[i].count;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(rt2x00mac_get_tx_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);

	/*
	 * 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--;
	}

	/*
	 * When the erp information has changed, we should perform
	 * additional configuration steps. For all other changes we are done.
	 */
	if (changes & BSS_CHANGED_ERP_PREAMBLE)
		rt2x00lib_config_erp(rt2x00dev, intf, bss_conf);

	spin_lock(&intf->lock);
	memcpy(&intf->conf, bss_conf, sizeof(*bss_conf));
	spin_unlock(&intf->lock);
}
EXPORT_SYMBOL_GPL(rt2x00mac_bss_info_changed);

int rt2x00mac_conf_tx(struct ieee80211_hw *hw, int 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. */

	if (params->aifs >= 0)
		queue->aifs = params->aifs;
	else
		queue->aifs = 2;

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

	return 0;
}
EXPORT_SYMBOL_GPL(rt2x00mac_conf_tx);
Commit	Line	Data
95ea3627	1	/*
811aa9ca	2	Copyright (C) 2004 - 2008 rt2x00 SourceForge Project
95ea3627 ID	3	<http://rt2x00.serialmonkey.com>
	4
	5	This program is free software; you can redistribute it and/or modify
	6	it under the terms of the GNU General Public License as published by
	7	the Free Software Foundation; either version 2 of the License, or
	8	(at your option) any later version.
	9
	10	This program is distributed in the hope that it will be useful,
	11	but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	GNU General Public License for more details.
	14
	15	You should have received a copy of the GNU General Public License
	16	along with this program; if not, write to the
	17	Free Software Foundation, Inc.,
	18	59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	19	*/
	20
	21	/*
	22	Module: rt2x00mac
	23	Abstract: rt2x00 generic mac80211 routines.
	24	*/
	25
95ea3627 ID	26	#include <linux/kernel.h>
	27	#include <linux/module.h>
	28
	29	#include "rt2x00.h"
	30	#include "rt2x00lib.h"
	31
	32	static int rt2x00mac_tx_rts_cts(struct rt2x00_dev *rt2x00dev,
181d6902	33	struct data_queue *queue,
95ea3627 ID	34	struct sk_buff *frag_skb,
	35	struct ieee80211_tx_control *control)
	36	{
baf26a7e	37	struct skb_frame_desc *skbdesc;
95ea3627 ID	38	struct sk_buff *skb;
	39	int size;
	40
	41	if (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
	42	size = sizeof(struct ieee80211_cts);
	43	else
	44	size = sizeof(struct ieee80211_rts);
	45
	46	skb = dev_alloc_skb(size + rt2x00dev->hw->extra_tx_headroom);
	47	if (!skb) {
	48	WARNING(rt2x00dev, "Failed to create RTS/CTS frame.\n");
	49	return NETDEV_TX_BUSY;
	50	}
	51
	52	skb_reserve(skb, rt2x00dev->hw->extra_tx_headroom);
	53	skb_put(skb, size);
	54
	55	if (control->flags & IEEE80211_TXCTL_USE_CTS_PROTECT)
6bb40dd1	56	ieee80211_ctstoself_get(rt2x00dev->hw, control->vif,
95ea3627 ID	57	frag_skb->data, frag_skb->len, control,
	58	(struct ieee80211_cts *)(skb->data));
	59	else
6bb40dd1	60	ieee80211_rts_get(rt2x00dev->hw, control->vif,
95ea3627 ID	61	frag_skb->data, frag_skb->len, control,
	62	(struct ieee80211_rts *)(skb->data));
	63
baf26a7e ID	64	/*
	65	* Initialize skb descriptor
	66	*/
	67	skbdesc = get_skb_frame_desc(skb);
	68	memset(skbdesc, 0, sizeof(*skbdesc));
	69	skbdesc->flags \|= FRAME_DESC_DRIVER_GENERATED;
	70
181d6902	71	if (rt2x00dev->ops->lib->write_tx_data(rt2x00dev, queue, skb, control)) {
95ea3627 ID	72	WARNING(rt2x00dev, "Failed to send RTS/CTS frame.\n");
	73	return NETDEV_TX_BUSY;
	74	}
	75
	76	return NETDEV_TX_OK;
	77	}
	78
	79	int rt2x00mac_tx(struct ieee80211_hw hw, struct sk_buff skb,
	80	struct ieee80211_tx_control *control)
	81	{
	82	struct rt2x00_dev *rt2x00dev = hw->priv;
	83	struct ieee80211_hdr ieee80211hdr = (struct ieee80211_hdr )skb->data;
181d6902	84	struct data_queue *queue;
baf26a7e	85	struct skb_frame_desc *skbdesc;
95ea3627 ID	86	u16 frame_control;
95ea3627 ID	87
066cb637 ID	88	/*
	89	* Mac80211 might be calling this function while we are trying
	90	* to remove the device or perhaps suspending it.
	91	* Note that we can only stop the TX queues inside the TX path
	92	* due to possible race conditions in mac80211.
	93	*/
	94	if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags)) {
	95	ieee80211_stop_queues(hw);
1230cb83	96	return NETDEV_TX_OK;
066cb637 ID	97	}
066cb637 ID	98
95ea3627	99	/*
181d6902	100	* Determine which queue to put packet on.
95ea3627	101	*/
e4030a2f ID	102	if (control->flags & IEEE80211_TXCTL_SEND_AFTER_DTIM &&
	103	test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags))
	104	queue = rt2x00queue_get_queue(rt2x00dev, RT2X00_BCN_QUEUE_ATIM);
	105	else
	106	queue = rt2x00queue_get_queue(rt2x00dev, control->queue);
181d6902	107	if (unlikely(!queue)) {
95ea3627 ID	108	ERROR(rt2x00dev,
	109	"Attempt to send packet over invalid queue %d.\n"
	110	"Please file bug report to %s.\n",
	111	control->queue, DRV_PROJECT);
	112	dev_kfree_skb_any(skb);
	113	return NETDEV_TX_OK;
	114	}
	115
	116	/*
	117	* If CTS/RTS is required. and this frame is not CTS or RTS,
	118	* create and queue that frame first. But make sure we have
	119	* at least enough entries available to send this CTS/RTS
	120	* frame as well as the data frame.
	121	*/
	122	frame_control = le16_to_cpu(ieee80211hdr->frame_control);
	123	if (!is_rts_frame(frame_control) && !is_cts_frame(frame_control) &&
	124	(control->flags & (IEEE80211_TXCTL_USE_RTS_CTS \|
	125	IEEE80211_TXCTL_USE_CTS_PROTECT))) {
181d6902	126	if (rt2x00queue_available(queue) <= 1) {
1230cb83	127	ieee80211_stop_queue(rt2x00dev->hw, control->queue);
95ea3627	128	return NETDEV_TX_BUSY;
1230cb83	129	}
95ea3627	130
181d6902	131	if (rt2x00mac_tx_rts_cts(rt2x00dev, queue, skb, control)) {
1230cb83	132	ieee80211_stop_queue(rt2x00dev->hw, control->queue);
95ea3627	133	return NETDEV_TX_BUSY;
1230cb83	134	}
95ea3627 ID	135	}
95ea3627 ID	136
baf26a7e ID	137	/*
	138	* Initialize skb descriptor
	139	*/
	140	skbdesc = get_skb_frame_desc(skb);
	141	memset(skbdesc, 0, sizeof(*skbdesc));
	142
181d6902	143	if (rt2x00dev->ops->lib->write_tx_data(rt2x00dev, queue, skb, control)) {
1230cb83	144	ieee80211_stop_queue(rt2x00dev->hw, control->queue);
95ea3627	145	return NETDEV_TX_BUSY;
1230cb83 ID	146	}
1230cb83 ID	147
181d6902	148	if (rt2x00queue_full(queue))
1230cb83	149	ieee80211_stop_queue(rt2x00dev->hw, control->queue);
95ea3627 ID	150
	151	if (rt2x00dev->ops->lib->kick_tx_queue)
	152	rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, control->queue);
	153
	154	return NETDEV_TX_OK;
	155	}
	156	EXPORT_SYMBOL_GPL(rt2x00mac_tx);
	157
	158	int rt2x00mac_start(struct ieee80211_hw *hw)
	159	{
	160	struct rt2x00_dev *rt2x00dev = hw->priv;
95ea3627	161
e37ea213	162	if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
95ea3627 ID	163	return 0;
95ea3627 ID	164
e37ea213	165	return rt2x00lib_start(rt2x00dev);
95ea3627 ID	166	}
	167	EXPORT_SYMBOL_GPL(rt2x00mac_start);
	168
	169	void rt2x00mac_stop(struct ieee80211_hw *hw)
	170	{
	171	struct rt2x00_dev *rt2x00dev = hw->priv;
	172
066cb637 ID	173	if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
	174	return;
	175
e37ea213	176	rt2x00lib_stop(rt2x00dev);
95ea3627 ID	177	}
	178	EXPORT_SYMBOL_GPL(rt2x00mac_stop);
	179
	180	int rt2x00mac_add_interface(struct ieee80211_hw *hw,
	181	struct ieee80211_if_init_conf *conf)
	182	{
	183	struct rt2x00_dev *rt2x00dev = hw->priv;
6bb40dd1 ID	184	struct rt2x00_intf *intf = vif_to_intf(conf->vif);
6bb40dd1 ID	185	struct data_queue *queue =
5957da4c	186	rt2x00queue_get_queue(rt2x00dev, RT2X00_BCN_QUEUE_BEACON);
6bb40dd1 ID	187	struct queue_entry *entry = NULL;
6bb40dd1 ID	188	unsigned int i;
95ea3627 ID	189
95ea3627 ID	190	/*
6bb40dd1 ID	191	* Don't allow interfaces to be added
6bb40dd1 ID	192	* the device has disappeared.
95ea3627	193	*/
066cb637	194	if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags) \|\|
6bb40dd1 ID	195	!test_bit(DEVICE_STARTED, &rt2x00dev->flags))
	196	return -ENODEV;
	197
	198	/*
	199	* When we don't support mixed interfaces (a combination
	200	* of sta and ap virtual interfaces) then we can only
	201	* add this interface when the rival interface count is 0.
	202	*/
	203	if (!test_bit(DRIVER_SUPPORT_MIXED_INTERFACES, &rt2x00dev->flags) &&
	204	((conf->type == IEEE80211_IF_TYPE_AP && rt2x00dev->intf_sta_count) \|\|
	205	(conf->type != IEEE80211_IF_TYPE_AP && rt2x00dev->intf_ap_count)))
	206	return -ENOBUFS;
	207
	208	/*
	209	* Check if we exceeded the maximum amount of supported interfaces.
	210	*/
	211	if ((conf->type == IEEE80211_IF_TYPE_AP &&
	212	rt2x00dev->intf_ap_count >= rt2x00dev->ops->max_ap_intf) \|\|
	213	(conf->type != IEEE80211_IF_TYPE_AP &&
	214	rt2x00dev->intf_sta_count >= rt2x00dev->ops->max_sta_intf))
	215	return -ENOBUFS;
	216
	217	/*
	218	* Loop through all beacon queues to find a free
	219	* entry. Since there are as much beacon entries
	220	* as the maximum interfaces, this search shouldn't
	221	* fail.
	222	*/
	223	for (i = 0; i < queue->limit; i++) {
	224	entry = &queue->entries[i];
	225	if (!__test_and_set_bit(ENTRY_BCN_ASSIGNED, &entry->flags))
	226	break;
	227	}
	228
	229	if (unlikely(i == queue->limit))
95ea3627 ID	230	return -ENOBUFS;
95ea3627 ID	231
6bb40dd1 ID	232	/*
	233	* We are now absolutely sure the interface can be created,
	234	* increase interface count and start initialization.
	235	*/
	236
	237	if (conf->type == IEEE80211_IF_TYPE_AP)
	238	rt2x00dev->intf_ap_count++;
	239	else
	240	rt2x00dev->intf_sta_count++;
	241
	242	spin_lock_init(&intf->lock);
	243	intf->beacon = entry;
	244
4150c572 JB	245	if (conf->type == IEEE80211_IF_TYPE_AP)
	246	memcpy(&intf->bssid, conf->mac_addr, ETH_ALEN);
	247	memcpy(&intf->mac, conf->mac_addr, ETH_ALEN);
95ea3627 ID	248
95ea3627 ID	249	/*
95ea3627	250	* The MAC adddress must be configured after the device
4150c572 JB	251	* has been initialized. Otherwise the device can reset
4150c572 JB	252	* the MAC registers.
95ea3627	253	*/
6bb40dd1	254	rt2x00lib_config_intf(rt2x00dev, intf, conf->type, intf->mac, NULL);
95ea3627 ID	255
	256	return 0;
	257	}
	258	EXPORT_SYMBOL_GPL(rt2x00mac_add_interface);
	259
	260	void rt2x00mac_remove_interface(struct ieee80211_hw *hw,
	261	struct ieee80211_if_init_conf *conf)
	262	{
	263	struct rt2x00_dev *rt2x00dev = hw->priv;
6bb40dd1	264	struct rt2x00_intf *intf = vif_to_intf(conf->vif);
95ea3627 ID	265
95ea3627 ID	266	/*
066cb637 ID	267	* Don't allow interfaces to be remove while
	268	* either the device has disappeared or when
	269	* no interface is present.
95ea3627	270	*/
066cb637	271	if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags) \|\|
6bb40dd1 ID	272	(conf->type == IEEE80211_IF_TYPE_AP && !rt2x00dev->intf_ap_count) \|\|
6bb40dd1 ID	273	(conf->type != IEEE80211_IF_TYPE_AP && !rt2x00dev->intf_sta_count))
95ea3627 ID	274	return;
95ea3627 ID	275
6bb40dd1 ID	276	if (conf->type == IEEE80211_IF_TYPE_AP)
	277	rt2x00dev->intf_ap_count--;
	278	else
	279	rt2x00dev->intf_sta_count--;
	280
	281	/*
	282	* Release beacon entry so it is available for
	283	* new interfaces again.
	284	*/
	285	__clear_bit(ENTRY_BCN_ASSIGNED, &intf->beacon->flags);
95ea3627 ID	286
	287	/*
	288	* Make sure the bssid and mac address registers
	289	* are cleared to prevent false ACKing of frames.
	290	*/
6bb40dd1 ID	291	rt2x00lib_config_intf(rt2x00dev, intf,
6bb40dd1 ID	292	IEEE80211_IF_TYPE_INVALID, NULL, NULL);
95ea3627 ID	293	}
	294	EXPORT_SYMBOL_GPL(rt2x00mac_remove_interface);
	295
	296	int rt2x00mac_config(struct ieee80211_hw hw, struct ieee80211_conf conf)
	297	{
	298	struct rt2x00_dev *rt2x00dev = hw->priv;
	299
	300	/*
066cb637 ID	301	* Mac80211 might be calling this function while we are trying
066cb637 ID	302	* to remove the device or perhaps suspending it.
95ea3627	303	*/
066cb637	304	if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
95ea3627 ID	305	return 0;
	306
	307	/*
	308	* Check if we need to disable the radio,
	309	* if this is not the case, at least the RX must be disabled.
	310	*/
	311	if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags)) {
	312	if (!conf->radio_enabled)
	313	rt2x00lib_disable_radio(rt2x00dev);
	314	else
5cbf830e	315	rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF);
95ea3627 ID	316	}
95ea3627 ID	317
066cb637	318	rt2x00lib_config(rt2x00dev, conf, 0);
95ea3627	319
95ea3627 ID	320	/*
	321	* Reenable RX only if the radio should be on.
	322	*/
	323	if (test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
5cbf830e	324	rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON);
95ea3627 ID	325	else if (conf->radio_enabled)
	326	return rt2x00lib_enable_radio(rt2x00dev);
	327
	328	return 0;
	329	}
	330	EXPORT_SYMBOL_GPL(rt2x00mac_config);
	331
32bfd35d JB	332	int rt2x00mac_config_interface(struct ieee80211_hw *hw,
32bfd35d JB	333	struct ieee80211_vif *vif,
95ea3627 ID	334	struct ieee80211_if_conf *conf)
	335	{
	336	struct rt2x00_dev *rt2x00dev = hw->priv;
6bb40dd1	337	struct rt2x00_intf *intf = vif_to_intf(vif);
95ea3627 ID	338	int status;
	339
	340	/*
066cb637 ID	341	* Mac80211 might be calling this function while we are trying
066cb637 ID	342	* to remove the device or perhaps suspending it.
95ea3627	343	*/
066cb637	344	if (!test_bit(DEVICE_PRESENT, &rt2x00dev->flags))
95ea3627 ID	345	return 0;
95ea3627 ID	346
6bb40dd1	347	spin_lock(&intf->lock);
95ea3627 ID	348
	349	/*
	350	* If the interface does not work in master mode,
	351	* then the bssid value in the interface structure
	352	* should now be set.
	353	*/
	354	if (conf->type != IEEE80211_IF_TYPE_AP)
	355	memcpy(&intf->bssid, conf->bssid, ETH_ALEN);
6bb40dd1 ID	356
6bb40dd1 ID	357	spin_unlock(&intf->lock);
95ea3627	358
e44df929 ID	359	/*
	360	* Call rt2x00_config_intf() outside of the spinlock context since
	361	* the call will sleep for USB drivers. By using the ieee80211_if_conf
	362	* values as arguments we make keep access to rt2x00_intf thread safe
	363	* even without the lock.
	364	*/
	365	rt2x00lib_config_intf(rt2x00dev, intf, conf->type, NULL, conf->bssid);
	366
95ea3627 ID	367	/*
	368	* We only need to initialize the beacon when master mode is enabled.
	369	*/
	370	if (conf->type != IEEE80211_IF_TYPE_AP \|\| !conf->beacon)
	371	return 0;
	372
	373	status = rt2x00dev->ops->hw->beacon_update(rt2x00dev->hw,
	374	conf->beacon,
	375	conf->beacon_control);
	376	if (status)
	377	dev_kfree_skb(conf->beacon);
	378
	379	return status;
	380	}
	381	EXPORT_SYMBOL_GPL(rt2x00mac_config_interface);
	382
95ea3627 ID	383	int rt2x00mac_get_stats(struct ieee80211_hw *hw,
	384	struct ieee80211_low_level_stats *stats)
	385	{
	386	struct rt2x00_dev *rt2x00dev = hw->priv;
	387
	388	/*
	389	* The dot11ACKFailureCount, dot11RTSFailureCount and
	390	* dot11RTSSuccessCount are updated in interrupt time.
	391	* dot11FCSErrorCount is updated in the link tuner.
	392	*/
	393	memcpy(stats, &rt2x00dev->low_level_stats, sizeof(*stats));
	394
	395	return 0;
	396	}
	397	EXPORT_SYMBOL_GPL(rt2x00mac_get_stats);
	398
	399	int rt2x00mac_get_tx_stats(struct ieee80211_hw *hw,
	400	struct ieee80211_tx_queue_stats *stats)
	401	{
	402	struct rt2x00_dev *rt2x00dev = hw->priv;
	403	unsigned int i;
	404
181d6902 ID	405	for (i = 0; i < hw->queues; i++) {
	406	stats->data[i].len = rt2x00dev->tx[i].length;
	407	stats->data[i].limit = rt2x00dev->tx[i].limit;
	408	stats->data[i].count = rt2x00dev->tx[i].count;
	409	}
95ea3627 ID	410
	411	return 0;
	412	}
	413	EXPORT_SYMBOL_GPL(rt2x00mac_get_tx_stats);
	414
471b3efd JB	415	void rt2x00mac_bss_info_changed(struct ieee80211_hw *hw,
	416	struct ieee80211_vif *vif,
	417	struct ieee80211_bss_conf *bss_conf,
	418	u32 changes)
5c58ee51 ID	419	{
5c58ee51 ID	420	struct rt2x00_dev *rt2x00dev = hw->priv;
6bb40dd1	421	struct rt2x00_intf *intf = vif_to_intf(vif);
5c58ee51 ID	422
5c58ee51 ID	423	/*
6bb40dd1 ID	424	* When the association status has changed we must reset the link
	425	* tuner counter. This is because some drivers determine if they
	426	* should perform link tuning based on the number of seconds
	427	* while associated or not associated.
5c58ee51	428	*/
6bb40dd1 ID	429	if (changes & BSS_CHANGED_ASSOC) {
6bb40dd1 ID	430	rt2x00dev->link.count = 0;
5c58ee51	431
6bb40dd1 ID	432	if (bss_conf->assoc)
	433	rt2x00dev->intf_associated++;
	434	else
	435	rt2x00dev->intf_associated--;
	436	}
5c58ee51	437
6bb40dd1	438	/*
72810379 ID	439	* When the erp information has changed, we should perform
72810379 ID	440	* additional configuration steps. For all other changes we are done.
6bb40dd1	441	*/
72810379 ID	442	if (changes & BSS_CHANGED_ERP_PREAMBLE)
72810379 ID	443	rt2x00lib_config_erp(rt2x00dev, intf, bss_conf);
5c58ee51	444
72810379 ID	445	spin_lock(&intf->lock);
	446	memcpy(&intf->conf, bss_conf, sizeof(*bss_conf));
	447	spin_unlock(&intf->lock);
5c58ee51	448	}
471b3efd	449	EXPORT_SYMBOL_GPL(rt2x00mac_bss_info_changed);
5c58ee51	450
181d6902	451	int rt2x00mac_conf_tx(struct ieee80211_hw *hw, int queue_idx,
95ea3627 ID	452	const struct ieee80211_tx_queue_params *params)
	453	{
	454	struct rt2x00_dev *rt2x00dev = hw->priv;
181d6902	455	struct data_queue *queue;
95ea3627	456
181d6902 ID	457	queue = rt2x00queue_get_queue(rt2x00dev, queue_idx);
181d6902 ID	458	if (unlikely(!queue))
95ea3627 ID	459	return -EINVAL;
	460
	461	/*
	462	* The passed variables are stored as real value ((2^n)-1).
	463	* Ralink registers require to know the bit number 'n'.
	464	*/
3b3618ad	465	if (params->cw_min > 0)
181d6902	466	queue->cw_min = fls(params->cw_min);
95ea3627	467	else
181d6902	468	queue->cw_min = 5; /* cw_min: 2^5 = 32. */
95ea3627	469
3b3618ad	470	if (params->cw_max > 0)
181d6902	471	queue->cw_max = fls(params->cw_max);
95ea3627	472	else
181d6902	473	queue->cw_max = 10; /* cw_min: 2^10 = 1024. */
95ea3627	474
3b3618ad	475	if (params->aifs >= 0)
181d6902	476	queue->aifs = params->aifs;
95ea3627	477	else
181d6902	478	queue->aifs = 2;
95ea3627 ID	479
95ea3627 ID	480	INFO(rt2x00dev,
181d6902 ID	481	"Configured TX queue %d - CWmin: %d, CWmax: %d, Aifs: %d.\n",
181d6902 ID	482	queue_idx, queue->cw_min, queue->cw_max, queue->aifs);
95ea3627 ID	483
	484	return 0;
	485	}
	486	EXPORT_SYMBOL_GPL(rt2x00mac_conf_tx);