drivers/net/wireless/iwlwifi/iwl-agn-sta.c

/******************************************************************************
 *
 * Copyright(c) 2003 - 2011 Intel Corporation. All rights reserved.
 *
 * Portions of this file are derived from the ipw3945 project, as well
 * as portions of the ieee80211 subsystem header files.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * 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.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
 *
 * The full GNU General Public License is included in this distribution in the
 * file called LICENSE.
 *
 * Contact Information:
 *  Intel Linux Wireless <ilw@linux.intel.com>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 *****************************************************************************/

#include <net/mac80211.h>

#include "iwl-dev.h"
#include "iwl-core.h"
#include "iwl-sta.h"
#include "iwl-agn.h"
#include "iwl-trans.h"

void iwl_sta_fill_lq(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
		     u8 sta_id, struct iwl_link_quality_cmd *link_cmd)
{
	int i, r;
	u32 rate_flags = 0;
	__le32 rate_n_flags;

	lockdep_assert_held(&priv->shrd->mutex);

	memset(link_cmd, 0, sizeof(*link_cmd));

	/* Set up the rate scaling to start at selected rate, fall back
	 * all the way down to 1M in IEEE order, and then spin on 1M */
	if (priv->band == IEEE80211_BAND_5GHZ)
		r = IWL_RATE_6M_INDEX;
	else if (ctx && ctx->vif && ctx->vif->p2p)
		r = IWL_RATE_6M_INDEX;
	else
		r = IWL_RATE_1M_INDEX;

	if (r >= IWL_FIRST_CCK_RATE && r <= IWL_LAST_CCK_RATE)
		rate_flags |= RATE_MCS_CCK_MSK;

	rate_flags |= first_antenna(hw_params(priv).valid_tx_ant) <<
				RATE_MCS_ANT_POS;
	rate_n_flags = iwl_hw_set_rate_n_flags(iwl_rates[r].plcp, rate_flags);
	for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
		link_cmd->rs_table[i].rate_n_flags = rate_n_flags;

	link_cmd->general_params.single_stream_ant_msk =
			first_antenna(hw_params(priv).valid_tx_ant);

	link_cmd->general_params.dual_stream_ant_msk =
		hw_params(priv).valid_tx_ant &
		~first_antenna(hw_params(priv).valid_tx_ant);
	if (!link_cmd->general_params.dual_stream_ant_msk) {
		link_cmd->general_params.dual_stream_ant_msk = ANT_AB;
	} else if (num_of_ant(hw_params(priv).valid_tx_ant) == 2) {
		link_cmd->general_params.dual_stream_ant_msk =
			hw_params(priv).valid_tx_ant;
	}

	link_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
	link_cmd->agg_params.agg_time_limit =
		cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);

	link_cmd->sta_id = sta_id;
}

static struct iwl_link_quality_cmd *
iwl_sta_alloc_lq(struct iwl_priv *priv, struct iwl_rxon_context *ctx, u8 sta_id)
{
	struct iwl_link_quality_cmd *link_cmd;

	link_cmd = kzalloc(sizeof(struct iwl_link_quality_cmd), GFP_KERNEL);
	if (!link_cmd) {
		IWL_ERR(priv, "Unable to allocate memory for LQ cmd.\n");
		return NULL;
	}

	iwl_sta_fill_lq(priv, ctx, sta_id, link_cmd);

	return link_cmd;
}

/*
 * iwlagn_add_bssid_station - Add the special IBSS BSSID station
 *
 * Function sleeps.
 */
int iwlagn_add_bssid_station(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
			     const u8 *addr, u8 *sta_id_r)
{
	int ret;
	u8 sta_id;
	struct iwl_link_quality_cmd *link_cmd;
	unsigned long flags;

	if (sta_id_r)
		*sta_id_r = IWL_INVALID_STATION;

	ret = iwl_add_station_common(priv, ctx, addr, 0, NULL, &sta_id);
	if (ret) {
		IWL_ERR(priv, "Unable to add station %pM\n", addr);
		return ret;
	}

	if (sta_id_r)
		*sta_id_r = sta_id;

	spin_lock_irqsave(&priv->shrd->sta_lock, flags);
	priv->stations[sta_id].used |= IWL_STA_LOCAL;
	spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);

	/* Set up default rate scaling table in device's station table */
	link_cmd = iwl_sta_alloc_lq(priv, ctx, sta_id);
	if (!link_cmd) {
		IWL_ERR(priv, "Unable to initialize rate scaling for station %pM.\n",
			addr);
		return -ENOMEM;
	}

	ret = iwl_send_lq_cmd(priv, ctx, link_cmd, CMD_SYNC, true);
	if (ret)
		IWL_ERR(priv, "Link quality command failed (%d)\n", ret);

	spin_lock_irqsave(&priv->shrd->sta_lock, flags);
	priv->stations[sta_id].lq = link_cmd;
	spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);

	return 0;
}

/*
 * static WEP keys
 *
 * For each context, the device has a table of 4 static WEP keys
 * (one for each key index) that is updated with the following
 * commands.
 */

static int iwl_send_static_wepkey_cmd(struct iwl_priv *priv,
				      struct iwl_rxon_context *ctx,
				      bool send_if_empty)
{
	int i, not_empty = 0;
	u8 buff[sizeof(struct iwl_wep_cmd) +
		sizeof(struct iwl_wep_key) * WEP_KEYS_MAX];
	struct iwl_wep_cmd *wep_cmd = (struct iwl_wep_cmd *)buff;
	size_t cmd_size  = sizeof(struct iwl_wep_cmd);
	struct iwl_host_cmd cmd = {
		.id = ctx->wep_key_cmd,
		.data = { wep_cmd, },
		.flags = CMD_SYNC,
	};

	might_sleep();

	memset(wep_cmd, 0, cmd_size +
			(sizeof(struct iwl_wep_key) * WEP_KEYS_MAX));

	for (i = 0; i < WEP_KEYS_MAX ; i++) {
		wep_cmd->key[i].key_index = i;
		if (ctx->wep_keys[i].key_size) {
			wep_cmd->key[i].key_offset = i;
			not_empty = 1;
		} else {
			wep_cmd->key[i].key_offset = WEP_INVALID_OFFSET;
		}

		wep_cmd->key[i].key_size = ctx->wep_keys[i].key_size;
		memcpy(&wep_cmd->key[i].key[3], ctx->wep_keys[i].key,
				ctx->wep_keys[i].key_size);
	}

	wep_cmd->global_key_type = WEP_KEY_WEP_TYPE;
	wep_cmd->num_keys = WEP_KEYS_MAX;

	cmd_size += sizeof(struct iwl_wep_key) * WEP_KEYS_MAX;

	cmd.len[0] = cmd_size;

	if (not_empty || send_if_empty)
		return iwl_trans_send_cmd(trans(priv), &cmd);
	else
		return 0;
}

int iwl_restore_default_wep_keys(struct iwl_priv *priv,
				 struct iwl_rxon_context *ctx)
{
	lockdep_assert_held(&priv->shrd->mutex);

	return iwl_send_static_wepkey_cmd(priv, ctx, false);
}

int iwl_remove_default_wep_key(struct iwl_priv *priv,
			       struct iwl_rxon_context *ctx,
			       struct ieee80211_key_conf *keyconf)
{
	int ret;

	lockdep_assert_held(&priv->shrd->mutex);

	IWL_DEBUG_WEP(priv, "Removing default WEP key: idx=%d\n",
		      keyconf->keyidx);

	memset(&ctx->wep_keys[keyconf->keyidx], 0, sizeof(ctx->wep_keys[0]));
	if (iwl_is_rfkill(priv->shrd)) {
		IWL_DEBUG_WEP(priv, "Not sending REPLY_WEPKEY command due to RFKILL.\n");
		/* but keys in device are clear anyway so return success */
		return 0;
	}
	ret = iwl_send_static_wepkey_cmd(priv, ctx, 1);
	IWL_DEBUG_WEP(priv, "Remove default WEP key: idx=%d ret=%d\n",
		      keyconf->keyidx, ret);

	return ret;
}

int iwl_set_default_wep_key(struct iwl_priv *priv,
			    struct iwl_rxon_context *ctx,
			    struct ieee80211_key_conf *keyconf)
{
	int ret;

	lockdep_assert_held(&priv->shrd->mutex);

	if (keyconf->keylen != WEP_KEY_LEN_128 &&
	    keyconf->keylen != WEP_KEY_LEN_64) {
		IWL_DEBUG_WEP(priv, "Bad WEP key length %d\n", keyconf->keylen);
		return -EINVAL;
	}

	keyconf->hw_key_idx = IWLAGN_HW_KEY_DEFAULT;

	ctx->wep_keys[keyconf->keyidx].key_size = keyconf->keylen;
	memcpy(&ctx->wep_keys[keyconf->keyidx].key, &keyconf->key,
							keyconf->keylen);

	ret = iwl_send_static_wepkey_cmd(priv, ctx, false);
	IWL_DEBUG_WEP(priv, "Set default WEP key: len=%d idx=%d ret=%d\n",
		keyconf->keylen, keyconf->keyidx, ret);

	return ret;
}

/*
 * dynamic (per-station) keys
 *
 * The dynamic keys are a little more complicated. The device has
 * a key cache of up to STA_KEY_MAX_NUM/STA_KEY_MAX_NUM_PAN keys.
 * These are linked to stations by a table that contains an index
 * into the key table for each station/key index/{mcast,unicast},
 * i.e. it's basically an array of pointers like this:
 *	key_offset_t key_mapping[NUM_STATIONS][4][2];
 * (it really works differently, but you can think of it as such)
 *
 * The key uploading and linking happens in the same command, the
 * add station command with STA_MODIFY_KEY_MASK.
 */

static u8 iwlagn_key_sta_id(struct iwl_priv *priv,
			    struct ieee80211_vif *vif,
			    struct ieee80211_sta *sta)
{
	struct iwl_vif_priv *vif_priv = (void *)vif->drv_priv;
	u8 sta_id = IWL_INVALID_STATION;

	if (sta)
		sta_id = iwl_sta_id(sta);

	/*
	 * The device expects GTKs for station interfaces to be
	 * installed as GTKs for the AP station. If we have no
	 * station ID, then use the ap_sta_id in that case.
	 */
	if (!sta && vif && vif_priv->ctx) {
		switch (vif->type) {
		case NL80211_IFTYPE_STATION:
			sta_id = vif_priv->ctx->ap_sta_id;
			break;
		default:
			/*
			 * In all other cases, the key will be
			 * used either for TX only or is bound
			 * to a station already.
			 */
			break;
		}
	}

	return sta_id;
}

static int iwlagn_send_sta_key(struct iwl_priv *priv,
			       struct ieee80211_key_conf *keyconf,
			       u8 sta_id, u32 tkip_iv32, u16 *tkip_p1k,
			       u32 cmd_flags)
{
	unsigned long flags;
	__le16 key_flags;
	struct iwl_addsta_cmd sta_cmd;
	int i;

	spin_lock_irqsave(&priv->shrd->sta_lock, flags);
	memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(sta_cmd));
	spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);

	key_flags = cpu_to_le16(keyconf->keyidx << STA_KEY_FLG_KEYID_POS);
	key_flags |= STA_KEY_FLG_MAP_KEY_MSK;

	switch (keyconf->cipher) {
	case WLAN_CIPHER_SUITE_CCMP:
		key_flags |= STA_KEY_FLG_CCMP;
		memcpy(sta_cmd.key.key, keyconf->key, keyconf->keylen);
		break;
	case WLAN_CIPHER_SUITE_TKIP:
		key_flags |= STA_KEY_FLG_TKIP;
		sta_cmd.key.tkip_rx_tsc_byte2 = tkip_iv32;
		for (i = 0; i < 5; i++)
			sta_cmd.key.tkip_rx_ttak[i] = cpu_to_le16(tkip_p1k[i]);
		memcpy(sta_cmd.key.key, keyconf->key, keyconf->keylen);
		break;
	case WLAN_CIPHER_SUITE_WEP104:
		key_flags |= STA_KEY_FLG_KEY_SIZE_MSK;
		/* fall through */
	case WLAN_CIPHER_SUITE_WEP40:
		key_flags |= STA_KEY_FLG_WEP;
		memcpy(&sta_cmd.key.key[3], keyconf->key, keyconf->keylen);
		break;
	default:
		WARN_ON(1);
		return -EINVAL;
	}

	if (!(keyconf->flags & IEEE80211_KEY_FLAG_PAIRWISE))
		key_flags |= STA_KEY_MULTICAST_MSK;

	/* key pointer (offset) */
	sta_cmd.key.key_offset = keyconf->hw_key_idx;

	sta_cmd.key.key_flags = key_flags;
	sta_cmd.mode = STA_CONTROL_MODIFY_MSK;
	sta_cmd.sta.modify_mask = STA_MODIFY_KEY_MASK;

	return iwl_send_add_sta(priv, &sta_cmd, cmd_flags);
}

void iwl_update_tkip_key(struct iwl_priv *priv,
			 struct ieee80211_vif *vif,
			 struct ieee80211_key_conf *keyconf,
			 struct ieee80211_sta *sta, u32 iv32, u16 *phase1key)
{
	u8 sta_id = iwlagn_key_sta_id(priv, vif, sta);

	if (sta_id == IWL_INVALID_STATION)
		return;

	if (iwl_scan_cancel(priv)) {
		/* cancel scan failed, just live w/ bad key and rely
		   briefly on SW decryption */
		return;
	}

	iwlagn_send_sta_key(priv, keyconf, sta_id,
			    iv32, phase1key, CMD_ASYNC);
}

int iwl_remove_dynamic_key(struct iwl_priv *priv,
			   struct iwl_rxon_context *ctx,
			   struct ieee80211_key_conf *keyconf,
			   struct ieee80211_sta *sta)
{
	unsigned long flags;
	struct iwl_addsta_cmd sta_cmd;
	u8 sta_id = iwlagn_key_sta_id(priv, ctx->vif, sta);

	/* if station isn't there, neither is the key */
	if (sta_id == IWL_INVALID_STATION)
		return -ENOENT;

	spin_lock_irqsave(&priv->shrd->sta_lock, flags);
	memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(sta_cmd));
	if (!(priv->stations[sta_id].used & IWL_STA_UCODE_ACTIVE))
		sta_id = IWL_INVALID_STATION;
	spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);

	if (sta_id == IWL_INVALID_STATION)
		return 0;

	lockdep_assert_held(&priv->shrd->mutex);

	ctx->key_mapping_keys--;

	IWL_DEBUG_WEP(priv, "Remove dynamic key: idx=%d sta=%d\n",
		      keyconf->keyidx, sta_id);

	if (!test_and_clear_bit(keyconf->hw_key_idx, &priv->ucode_key_table))
		IWL_ERR(priv, "offset %d not used in uCode key table.\n",
			keyconf->hw_key_idx);

	sta_cmd.key.key_flags = STA_KEY_FLG_NO_ENC | STA_KEY_FLG_INVALID;
	sta_cmd.key.key_offset = WEP_INVALID_OFFSET;
	sta_cmd.sta.modify_mask = STA_MODIFY_KEY_MASK;
	sta_cmd.mode = STA_CONTROL_MODIFY_MSK;

	return iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
}

int iwl_set_dynamic_key(struct iwl_priv *priv,
			struct iwl_rxon_context *ctx,
			struct ieee80211_key_conf *keyconf,
			struct ieee80211_sta *sta)
{
	struct ieee80211_key_seq seq;
	u16 p1k[5];
	int ret;
	u8 sta_id = iwlagn_key_sta_id(priv, ctx->vif, sta);
	const u8 *addr;

	if (sta_id == IWL_INVALID_STATION)
		return -EINVAL;

	lockdep_assert_held(&priv->shrd->mutex);

	keyconf->hw_key_idx = iwl_get_free_ucode_key_offset(priv);
	if (keyconf->hw_key_idx == WEP_INVALID_OFFSET)
		return -ENOSPC;

	ctx->key_mapping_keys++;

	switch (keyconf->cipher) {
	case WLAN_CIPHER_SUITE_TKIP:
		keyconf->flags |= IEEE80211_KEY_FLAG_GENERATE_MMIC;
		keyconf->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;

		if (sta)
			addr = sta->addr;
		else /* station mode case only */
			addr = ctx->active.bssid_addr;

		/* pre-fill phase 1 key into device cache */
		ieee80211_get_key_rx_seq(keyconf, 0, &seq);
		ieee80211_get_tkip_rx_p1k(keyconf, addr, seq.tkip.iv32, p1k);
		ret = iwlagn_send_sta_key(priv, keyconf, sta_id,
					  seq.tkip.iv32, p1k, CMD_SYNC);
		break;
	case WLAN_CIPHER_SUITE_CCMP:
		keyconf->flags |= IEEE80211_KEY_FLAG_GENERATE_IV;
		/* fall through */
	case WLAN_CIPHER_SUITE_WEP40:
	case WLAN_CIPHER_SUITE_WEP104:
		ret = iwlagn_send_sta_key(priv, keyconf, sta_id,
					  0, NULL, CMD_SYNC);
		break;
	default:
		IWL_ERR(priv, "Unknown cipher %x\n", keyconf->cipher);
		ret = -EINVAL;
	}

	if (ret) {
		ctx->key_mapping_keys--;
		clear_bit(keyconf->hw_key_idx, &priv->ucode_key_table);
	}

	IWL_DEBUG_WEP(priv, "Set dynamic key: cipher=%x len=%d idx=%d sta=%pM ret=%d\n",
		      keyconf->cipher, keyconf->keylen, keyconf->keyidx,
		      sta ? sta->addr : NULL, ret);

	return ret;
}

/**
 * iwlagn_alloc_bcast_station - add broadcast station into driver's station table.
 *
 * This adds the broadcast station into the driver's station table
 * and marks it driver active, so that it will be restored to the
 * device at the next best time.
 */
int iwlagn_alloc_bcast_station(struct iwl_priv *priv,
			       struct iwl_rxon_context *ctx)
{
	struct iwl_link_quality_cmd *link_cmd;
	unsigned long flags;
	u8 sta_id;

	spin_lock_irqsave(&priv->shrd->sta_lock, flags);
	sta_id = iwl_prep_station(priv, ctx, iwl_bcast_addr, false, NULL);
	if (sta_id == IWL_INVALID_STATION) {
		IWL_ERR(priv, "Unable to prepare broadcast station\n");
		spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);

		return -EINVAL;
	}

	priv->stations[sta_id].used |= IWL_STA_DRIVER_ACTIVE;
	priv->stations[sta_id].used |= IWL_STA_BCAST;
	spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);

	link_cmd = iwl_sta_alloc_lq(priv, ctx, sta_id);
	if (!link_cmd) {
		IWL_ERR(priv,
			"Unable to initialize rate scaling for bcast station.\n");
		return -ENOMEM;
	}

	spin_lock_irqsave(&priv->shrd->sta_lock, flags);
	priv->stations[sta_id].lq = link_cmd;
	spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);

	return 0;
}

/**
 * iwl_update_bcast_station - update broadcast station's LQ command
 *
 * Only used by iwlagn. Placed here to have all bcast station management
 * code together.
 */
int iwl_update_bcast_station(struct iwl_priv *priv,
			     struct iwl_rxon_context *ctx)
{
	unsigned long flags;
	struct iwl_link_quality_cmd *link_cmd;
	u8 sta_id = ctx->bcast_sta_id;

	link_cmd = iwl_sta_alloc_lq(priv, ctx, sta_id);
	if (!link_cmd) {
		IWL_ERR(priv, "Unable to initialize rate scaling for bcast station.\n");
		return -ENOMEM;
	}

	spin_lock_irqsave(&priv->shrd->sta_lock, flags);
	if (priv->stations[sta_id].lq)
		kfree(priv->stations[sta_id].lq);
	else
		IWL_DEBUG_INFO(priv, "Bcast station rate scaling has not been initialized yet.\n");
	priv->stations[sta_id].lq = link_cmd;
	spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);

	return 0;
}

int iwl_update_bcast_stations(struct iwl_priv *priv)
{
	struct iwl_rxon_context *ctx;
	int ret = 0;

	for_each_context(priv, ctx) {
		ret = iwl_update_bcast_station(priv, ctx);
		if (ret)
			break;
	}

	return ret;
}

/**
 * iwl_sta_tx_modify_enable_tid - Enable Tx for this TID in station table
 */
int iwl_sta_tx_modify_enable_tid(struct iwl_priv *priv, int sta_id, int tid)
{
	unsigned long flags;
	struct iwl_addsta_cmd sta_cmd;

	lockdep_assert_held(&priv->shrd->mutex);

	/* Remove "disable" flag, to enable Tx for this TID */
	spin_lock_irqsave(&priv->shrd->sta_lock, flags);
	priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_TID_DISABLE_TX;
	priv->stations[sta_id].sta.tid_disable_tx &= cpu_to_le16(~(1 << tid));
	priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
	memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(struct iwl_addsta_cmd));
	spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);

	return iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
}

int iwl_sta_rx_agg_start(struct iwl_priv *priv, struct ieee80211_sta *sta,
			 int tid, u16 ssn)
{
	unsigned long flags;
	int sta_id;
	struct iwl_addsta_cmd sta_cmd;

	lockdep_assert_held(&priv->shrd->mutex);

	sta_id = iwl_sta_id(sta);
	if (sta_id == IWL_INVALID_STATION)
		return -ENXIO;

	spin_lock_irqsave(&priv->shrd->sta_lock, flags);
	priv->stations[sta_id].sta.station_flags_msk = 0;
	priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_ADDBA_TID_MSK;
	priv->stations[sta_id].sta.add_immediate_ba_tid = (u8)tid;
	priv->stations[sta_id].sta.add_immediate_ba_ssn = cpu_to_le16(ssn);
	priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
	memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(struct iwl_addsta_cmd));
	spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);

	return iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
}

int iwl_sta_rx_agg_stop(struct iwl_priv *priv, struct ieee80211_sta *sta,
			int tid)
{
	unsigned long flags;
	int sta_id;
	struct iwl_addsta_cmd sta_cmd;

	lockdep_assert_held(&priv->shrd->mutex);

	sta_id = iwl_sta_id(sta);
	if (sta_id == IWL_INVALID_STATION) {
		IWL_ERR(priv, "Invalid station for AGG tid %d\n", tid);
		return -ENXIO;
	}

	spin_lock_irqsave(&priv->shrd->sta_lock, flags);
	priv->stations[sta_id].sta.station_flags_msk = 0;
	priv->stations[sta_id].sta.sta.modify_mask = STA_MODIFY_DELBA_TID_MSK;
	priv->stations[sta_id].sta.remove_immediate_ba_tid = (u8)tid;
	priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
	memcpy(&sta_cmd, &priv->stations[sta_id].sta, sizeof(struct iwl_addsta_cmd));
	spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);

	return iwl_send_add_sta(priv, &sta_cmd, CMD_SYNC);
}

static void iwl_sta_modify_ps_wake(struct iwl_priv *priv, int sta_id)
{
	unsigned long flags;

	spin_lock_irqsave(&priv->shrd->sta_lock, flags);
	priv->stations[sta_id].sta.station_flags &= ~STA_FLG_PWR_SAVE_MSK;
	priv->stations[sta_id].sta.station_flags_msk = STA_FLG_PWR_SAVE_MSK;
	priv->stations[sta_id].sta.sta.modify_mask = 0;
	priv->stations[sta_id].sta.sleep_tx_count = 0;
	priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
	iwl_send_add_sta(priv, &priv->stations[sta_id].sta, CMD_ASYNC);
	spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);

}

void iwl_sta_modify_sleep_tx_count(struct iwl_priv *priv, int sta_id, int cnt)
{
	unsigned long flags;

	spin_lock_irqsave(&priv->shrd->sta_lock, flags);
	priv->stations[sta_id].sta.station_flags |= STA_FLG_PWR_SAVE_MSK;
	priv->stations[sta_id].sta.station_flags_msk = STA_FLG_PWR_SAVE_MSK;
	priv->stations[sta_id].sta.sta.modify_mask =
					STA_MODIFY_SLEEP_TX_COUNT_MSK;
	priv->stations[sta_id].sta.sleep_tx_count = cpu_to_le16(cnt);
	priv->stations[sta_id].sta.mode = STA_CONTROL_MODIFY_MSK;
	iwl_send_add_sta(priv, &priv->stations[sta_id].sta, CMD_ASYNC);
	spin_unlock_irqrestore(&priv->shrd->sta_lock, flags);

}

void iwlagn_mac_sta_notify(struct ieee80211_hw *hw,
			   struct ieee80211_vif *vif,
			   enum sta_notify_cmd cmd,
			   struct ieee80211_sta *sta)
{
	struct iwl_priv *priv = hw->priv;
	struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
	int sta_id;

	IWL_DEBUG_MAC80211(priv, "enter\n");

	switch (cmd) {
	case STA_NOTIFY_SLEEP:
		WARN_ON(!sta_priv->client);
		sta_priv->asleep = true;
		if (atomic_read(&sta_priv->pending_frames) > 0)
			ieee80211_sta_block_awake(hw, sta, true);
		break;
	case STA_NOTIFY_AWAKE:
		WARN_ON(!sta_priv->client);
		if (!sta_priv->asleep)
			break;
		sta_priv->asleep = false;
		sta_id = iwl_sta_id(sta);
		if (sta_id != IWL_INVALID_STATION)
			iwl_sta_modify_ps_wake(priv, sta_id);
		break;
	default:
		break;
	}
	IWL_DEBUG_MAC80211(priv, "leave\n");
}