Initial import

1 files changed, 864 insertions, 0 deletions

diff --git a/drivers/net/wireless/rt2x00/rt2x00mac.c b/drivers/net/wireless/rt2x00/rt2x00mac.c
new file mode 100644
index 000000000..300876df0
--- /dev/null
+++ b/drivers/net/wireless/rt2x00/rt2x00mac.c
@@ -0,0 +1,864 @@
+/*
+	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, see <http://www.gnu.org/licenses/>.
+ */
+
+/*
+	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)) {
+		rt2x00_warn(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, NULL, true);
+	if (retval) {
+		dev_kfree_skb_any(skb);
+		rt2x00_warn(rt2x00dev, "Failed to send RTS/CTS frame\n");
+	}
+
+	return retval;
+}
+
+void rt2x00mac_tx(struct ieee80211_hw *hw,
+		  struct ieee80211_tx_control *control,
+		  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 = NULL;
+
+	/*
+	 * 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_free_skb;
+
+	/*
+	 * Use the ATIM queue if appropriate and present.
+	 */
+	if (tx_info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM &&
+	    rt2x00_has_cap_flag(rt2x00dev, REQUIRE_ATIM_QUEUE))
+		qid = QID_ATIM;
+
+	queue = rt2x00queue_get_tx_queue(rt2x00dev, qid);
+	if (unlikely(!queue)) {
+		rt2x00_err(rt2x00dev,
+			   "Attempt to send packet over invalid queue %d\n"
+			   "Please file bug report to %s\n", qid, DRV_PROJECT);
+		goto exit_free_skb;
+	}
+
+	/*
+	 * 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 (!rt2x00dev->ops->hw->set_rts_threshold &&
+	    (tx_info->control.rates[0].flags & (IEEE80211_TX_RC_USE_RTS_CTS |
+						IEEE80211_TX_RC_USE_CTS_PROTECT))) {
+		if (rt2x00queue_available(queue) <= 1)
+			goto exit_fail;
+
+		if (rt2x00mac_tx_rts_cts(rt2x00dev, queue, skb))
+			goto exit_fail;
+	}
+
+	if (unlikely(rt2x00queue_write_tx_frame(queue, skb, control->sta, false)))
+		goto exit_fail;
+
+	/*
+	 * Pausing queue has to be serialized with rt2x00lib_txdone(). Note
+	 * we should not use spin_lock_bh variant as bottom halve was already
+	 * disabled before ieee80211_xmit() call.
+	 */
+	spin_lock(&queue->tx_lock);
+	if (rt2x00queue_threshold(queue))
+		rt2x00queue_pause_queue(queue);
+	spin_unlock(&queue->tx_lock);
+
+	return;
+
+ exit_fail:
+	spin_lock(&queue->tx_lock);
+	rt2x00queue_pause_queue(queue);
+	spin_unlock(&queue->tx_lock);
+ exit_free_skb:
+	ieee80211_free_txskb(hw, skb);
+}
+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 = rt2x00dev->bcn;
+	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;
+
+	/*
+	 * 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++;
+
+	mutex_init(&intf->beacon_skb_mutex);
+	intf->beacon = entry;
+
+	/*
+	 * The MAC address 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.
+	 */
+	rt2x00lib_config_intf(rt2x00dev, intf, vif->type,
+			      vif->addr, 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().
+	 */
+	rt2x00queue_stop_queue(rt2x00dev->rx);
+
+	/*
+	 * 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 */
+	rt2x00queue_start_queue(rt2x00dev->rx);
+
+	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 (!rt2x00_has_cap_control_filters(rt2x00dev)) {
+		if (*total_flags & FIF_CONTROL || *total_flags & FIF_PSPOLL)
+			*total_flags |= FIF_CONTROL | FIF_PSPOLL;
+	}
+	if (!rt2x00_has_cap_control_filter_pspoll(rt2x00dev)) {
+		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;
+
+	set_bit(DELAYED_UPDATE_BEACON, &intf->delayed_flags);
+}
+
+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, IEEE80211_IFACE_ITER_RESUME_ALL,
+		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;
+	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, };
+	struct rt2x00_sta *sta_priv = NULL;
+
+	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
+		return 0;
+
+	if (!rt2x00_has_cap_hw_crypto(rt2x00dev))
+		return -EOPNOTSUPP;
+
+	/*
+	 * To support IBSS RSN, don't program group keys in IBSS, the
+	 * hardware will then not attempt to decrypt the frames.
+	 */
+	if (vif->type == NL80211_IFTYPE_ADHOC &&
+	    !(key->flags & IEEE80211_KEY_FLAG_PAIRWISE))
+		return -EOPNOTSUPP;
+
+	if (key->keylen > 32)
+		return -ENOSPC;
+
+	memset(&crypto, 0, sizeof(crypto));
+
+	crypto.bssidx = rt2x00lib_get_bssidx(rt2x00dev, vif);
+	crypto.cipher = rt2x00crypto_key_to_cipher(key);
+	if (crypto.cipher == CIPHER_NONE)
+		return -EOPNOTSUPP;
+	if (crypto.cipher == CIPHER_TKIP && rt2x00_is_usb(rt2x00dev))
+		return -EOPNOTSUPP;
+
+	crypto.cmd = cmd;
+
+	if (sta) {
+		crypto.address = sta->addr;
+		sta_priv = sta_to_rt2x00_sta(sta);
+		crypto.wcid = sta_priv->wcid;
+	} 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 */
+
+int rt2x00mac_sta_add(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
+		      struct ieee80211_sta *sta)
+{
+	struct rt2x00_dev *rt2x00dev = hw->priv;
+	struct rt2x00_sta *sta_priv = sta_to_rt2x00_sta(sta);
+
+	/*
+	 * If there's no space left in the device table store
+	 * -1 as wcid but tell mac80211 everything went ok.
+	 */
+	if (rt2x00dev->ops->lib->sta_add(rt2x00dev, vif, sta))
+		sta_priv->wcid = -1;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(rt2x00mac_sta_add);
+
+int rt2x00mac_sta_remove(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
+			 struct ieee80211_sta *sta)
+{
+	struct rt2x00_dev *rt2x00dev = hw->priv;
+	struct rt2x00_sta *sta_priv = sta_to_rt2x00_sta(sta);
+
+	/*
+	 * If we never sent the STA to the device no need to clean it up.
+	 */
+	if (sta_priv->wcid < 0)
+		return 0;
+
+	return rt2x00dev->ops->lib->sta_remove(rt2x00dev, sta_priv->wcid);
+}
+EXPORT_SYMBOL_GPL(rt2x00mac_sta_remove);
+
+void rt2x00mac_sw_scan_start(struct ieee80211_hw *hw,
+			     struct ieee80211_vif *vif,
+			     const u8 *mac_addr)
+{
+	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 ieee80211_vif *vif)
+{
+	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;
+
+	/*
+	 * Update the BSSID.
+	 */
+	if (changes & BSS_CHANGED_BSSID)
+		rt2x00lib_config_intf(rt2x00dev, intf, vif->type, NULL,
+				      bss_conf->bssid);
+
+	/*
+	 * Start/stop beaconing.
+	 */
+	if (changes & BSS_CHANGED_BEACON_ENABLED) {
+		mutex_lock(&intf->beacon_skb_mutex);
+		if (!bss_conf->enable_beacon && intf->enable_beacon) {
+			rt2x00dev->intf_beaconing--;
+			intf->enable_beacon = false;
+
+			if (rt2x00dev->intf_beaconing == 0) {
+				/*
+				 * Last beaconing interface disabled
+				 * -> stop beacon queue.
+				 */
+				rt2x00queue_stop_queue(rt2x00dev->bcn);
+			}
+			/*
+			 * Clear beacon in the H/W for this vif. This is needed
+			 * to disable beaconing on this particular interface
+			 * and keep it running on other interfaces.
+			 */
+			rt2x00queue_clear_beacon(rt2x00dev, vif);
+		} else if (bss_conf->enable_beacon && !intf->enable_beacon) {
+			rt2x00dev->intf_beaconing++;
+			intf->enable_beacon = true;
+			/*
+			 * Upload beacon to the H/W. This is only required on
+			 * USB devices. PCI devices fetch beacons periodically.
+			 */
+			if (rt2x00_is_usb(rt2x00dev))
+				rt2x00queue_update_beacon(rt2x00dev, vif);
+
+			if (rt2x00dev->intf_beaconing == 1) {
+				/*
+				 * First beaconing interface enabled
+				 * -> start beacon queue.
+				 */
+				rt2x00queue_start_queue(rt2x00dev->bcn);
+			}
+		}
+		mutex_unlock(&intf->beacon_skb_mutex);
+	}
+
+	/*
+	 * 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);
+
+		clear_bit(CONFIG_QOS_DISABLED, &rt2x00dev->flags);
+	}
+
+	/*
+	 * Check for access point which do not support 802.11e . We have to
+	 * generate data frames sequence number in S/W for such AP, because
+	 * of H/W bug.
+	 */
+	if (changes & BSS_CHANGED_QOS && !bss_conf->qos)
+		set_bit(CONFIG_QOS_DISABLED, &rt2x00dev->flags);
+
+	/*
+	 * When the erp information has changed, we should perform
+	 * additional configuration steps. For all other changes we are done.
+	 */
+	if (changes & (BSS_CHANGED_ERP_CTS_PROT | BSS_CHANGED_ERP_PREAMBLE |
+		       BSS_CHANGED_ERP_SLOT | BSS_CHANGED_BASIC_RATES |
+		       BSS_CHANGED_BEACON_INT | BSS_CHANGED_HT))
+		rt2x00lib_config_erp(rt2x00dev, intf, bss_conf, changes);
+}
+EXPORT_SYMBOL_GPL(rt2x00mac_bss_info_changed);
+
+int rt2x00mac_conf_tx(struct ieee80211_hw *hw,
+		      struct ieee80211_vif *vif, u16 queue_idx,
+		      const struct ieee80211_tx_queue_params *params)
+{
+	struct rt2x00_dev *rt2x00dev = hw->priv;
+	struct data_queue *queue;
+
+	queue = rt2x00queue_get_tx_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;
+
+	rt2x00_dbg(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);
+
+void rt2x00mac_flush(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
+		     u32 queues, bool drop)
+{
+	struct rt2x00_dev *rt2x00dev = hw->priv;
+	struct data_queue *queue;
+
+	if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
+		return;
+
+	tx_queue_for_each(rt2x00dev, queue)
+		rt2x00queue_flush_queue(queue, drop);
+}
+EXPORT_SYMBOL_GPL(rt2x00mac_flush);
+
+int rt2x00mac_set_antenna(struct ieee80211_hw *hw, u32 tx_ant, u32 rx_ant)
+{
+	struct rt2x00_dev *rt2x00dev = hw->priv;
+	struct link_ant *ant = &rt2x00dev->link.ant;
+	struct antenna_setup *def = &rt2x00dev->default_ant;
+	struct antenna_setup setup;
+
+	// The antenna value is not supposed to be 0,
+	// or exceed the maximum number of antenna's.
+	if (!tx_ant || (tx_ant & ~3) || !rx_ant || (rx_ant & ~3))
+		return -EINVAL;
+
+	// When the client tried to configure the antenna to or from
+	// diversity mode, we must reset the default antenna as well
+	// as that controls the diversity switch.
+	if (ant->flags & ANTENNA_TX_DIVERSITY && tx_ant != 3)
+		ant->flags &= ~ANTENNA_TX_DIVERSITY;
+	if (ant->flags & ANTENNA_RX_DIVERSITY && rx_ant != 3)
+		ant->flags &= ~ANTENNA_RX_DIVERSITY;
+
+	// If diversity is being enabled, check if we need hardware
+	// or software diversity. In the latter case, reset the value,
+	// and make sure we update the antenna flags to have the
+	// link tuner pick up the diversity tuning.
+	if (tx_ant == 3 && def->tx == ANTENNA_SW_DIVERSITY) {
+		tx_ant = ANTENNA_SW_DIVERSITY;
+		ant->flags |= ANTENNA_TX_DIVERSITY;
+	}
+
+	if (rx_ant == 3 && def->rx == ANTENNA_SW_DIVERSITY) {
+		rx_ant = ANTENNA_SW_DIVERSITY;
+		ant->flags |= ANTENNA_RX_DIVERSITY;
+	}
+
+	setup.tx = tx_ant;
+	setup.rx = rx_ant;
+	setup.rx_chain_num = 0;
+	setup.tx_chain_num = 0;
+
+	rt2x00lib_config_antenna(rt2x00dev, setup);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(rt2x00mac_set_antenna);
+
+int rt2x00mac_get_antenna(struct ieee80211_hw *hw, u32 *tx_ant, u32 *rx_ant)
+{
+	struct rt2x00_dev *rt2x00dev = hw->priv;
+	struct link_ant *ant = &rt2x00dev->link.ant;
+	struct antenna_setup *active = &rt2x00dev->link.ant.active;
+
+	// When software diversity is active, we must report this to the
+	// client and not the current active antenna state.
+	if (ant->flags & ANTENNA_TX_DIVERSITY)
+		*tx_ant = ANTENNA_HW_DIVERSITY;
+	else
+		*tx_ant = active->tx;
+
+	if (ant->flags & ANTENNA_RX_DIVERSITY)
+		*rx_ant = ANTENNA_HW_DIVERSITY;
+	else
+		*rx_ant = active->rx;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(rt2x00mac_get_antenna);
+
+void rt2x00mac_get_ringparam(struct ieee80211_hw *hw,
+			     u32 *tx, u32 *tx_max, u32 *rx, u32 *rx_max)
+{
+	struct rt2x00_dev *rt2x00dev = hw->priv;
+	struct data_queue *queue;
+
+	tx_queue_for_each(rt2x00dev, queue) {
+		*tx += queue->length;
+		*tx_max += queue->limit;
+	}
+
+	*rx = rt2x00dev->rx->length;
+	*rx_max = rt2x00dev->rx->limit;
+}
+EXPORT_SYMBOL_GPL(rt2x00mac_get_ringparam);
+
+bool rt2x00mac_tx_frames_pending(struct ieee80211_hw *hw)
+{
+	struct rt2x00_dev *rt2x00dev = hw->priv;
+	struct data_queue *queue;
+
+	tx_queue_for_each(rt2x00dev, queue) {
+		if (!rt2x00queue_empty(queue))
+			return true;
+	}
+
+	return false;
+}
+EXPORT_SYMBOL_GPL(rt2x00mac_tx_frames_pending);