[IWLWIFI]: add iwlwifi wireless drivers

This patch adds the mac80211 based wireless drivers for the Intel
PRO/Wireless 3945ABG/BG Network Connection and Intel Wireless WiFi
Link AGN (4965) adapters.

[ Move driver into it's own directory -DaveM ]

Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2118 insertions, 0 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-4965-rs.c b/drivers/net/wireless/iwlwifi/iwl-4965-rs.c
new file mode 100644
index 000000000000..f3638607d641
--- /dev/null
+++ b/drivers/net/wireless/iwlwifi/iwl-4965-rs.c
@@ -0,0 +1,2118 @@
+/******************************************************************************
+ *
+ * Copyright(c) 2005 - 2007 Intel Corporation. All rights reserved.
+ *
+ * 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:
+ * James P. Ketrenos <ipw2100-admin@linux.intel.com>
+ * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
+ *
+ *****************************************************************************/
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/skbuff.h>
+#include <linux/wireless.h>
+#include <net/mac80211.h>
+#include <net/ieee80211.h>
+
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/delay.h>
+
+#include <linux/workqueue.h>
+
+#include <net/mac80211.h>
+#include <linux/wireless.h>
+
+#include "../net/mac80211/ieee80211_rate.h"
+
+#include "iwlwifi.h"
+#include "iwl-helpers.h"
+
+#define RS_NAME "iwl-4965-rs"
+
+#define NUM_TRY_BEFORE_ANTENNA_TOGGLE 1
+#define IWL_NUMBER_TRY      1
+#define IWL_HT_NUMBER_TRY   3
+
+#define IWL_RATE_MAX_WINDOW		62
+#define IWL_RATE_HIGH_TH		10880
+#define IWL_RATE_MIN_FAILURE_TH		6
+#define IWL_RATE_MIN_SUCCESS_TH		8
+#define IWL_RATE_DECREASE_TH		1920
+#define IWL_RATE_INCREASE_TH            8960
+#define IWL_RATE_SCALE_FLUSH_INTVL   (2*HZ)        /*2 seconds */
+
+static u8 rs_ht_to_legacy[] = {
+	IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
+	IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
+	IWL_RATE_6M_INDEX,
+	IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
+	IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
+	IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
+	IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
+};
+
+struct iwl_rate {
+	u32 rate_n_flags;
+} __attribute__ ((packed));
+
+struct iwl_rate_scale_data {
+	u64 data;
+	s32 success_counter;
+	s32 success_ratio;
+	s32 counter;
+	s32 average_tpt;
+	unsigned long stamp;
+};
+
+struct iwl_scale_tbl_info {
+	enum iwl_table_type lq_type;
+	enum iwl_antenna_type antenna_type;
+	u8 is_SGI;
+	u8 is_fat;
+	u8 is_dup;
+	u8 action;
+	s32 *expected_tpt;
+	struct iwl_rate current_rate;
+	struct iwl_rate_scale_data win[IWL_RATE_COUNT];
+};
+
+struct iwl_rate_scale_priv {
+	u8 active_tbl;
+	u8 enable_counter;
+	u8 stay_in_tbl;
+	u8 search_better_tbl;
+	s32 last_tpt;
+	u32 table_count_limit;
+	u32 max_failure_limit;
+	u32 max_success_limit;
+	u32 table_count;
+	u32 total_failed;
+	u32 total_success;
+	u32 flush_timer;
+	u8 action_counter;
+	u8 antenna;
+	u8 valid_antenna;
+	u8 is_green;
+	u8 is_dup;
+	u8 phymode;
+	u8 ibss_sta_added;
+	u16 active_rate;
+	u16 active_siso_rate;
+	u16 active_mimo_rate;
+	u16 active_rate_basic;
+	struct iwl_link_quality_cmd lq;
+	struct iwl_scale_tbl_info lq_info[LQ_SIZE];
+};
+
+static void rs_rate_scale_perform(struct iwl_priv *priv,
+				   struct net_device *dev,
+				   struct ieee80211_hdr *hdr,
+				   struct sta_info *sta);
+static int rs_fill_link_cmd(struct iwl_rate_scale_priv *lq_data,
+			     struct iwl_rate *tx_mcs,
+			     struct iwl_link_quality_cmd *tbl,
+			     struct sta_info *sta);
+
+
+static s32 expected_tpt_A[IWL_RATE_COUNT] = {
+	0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186
+};
+
+static s32 expected_tpt_G[IWL_RATE_COUNT] = {
+	7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 186
+};
+
+static s32 expected_tpt_siso20MHz[IWL_RATE_COUNT] = {
+	0, 0, 0, 0, 42, 42, 76, 102, 124, 159, 183, 193, 202
+};
+
+static s32 expected_tpt_siso20MHzSGI[IWL_RATE_COUNT] = {
+	0, 0, 0, 0, 46, 46, 82, 110, 132, 168, 192, 202, 211
+};
+
+static s32 expected_tpt_mimo20MHz[IWL_RATE_COUNT] = {
+	0, 0, 0, 0, 74, 74, 123, 155, 179, 214, 236, 244, 251
+};
+
+static s32 expected_tpt_mimo20MHzSGI[IWL_RATE_COUNT] = {
+	0, 0, 0, 0, 81, 81, 131, 164, 188, 222, 243, 251, 257
+};
+
+static s32 expected_tpt_siso40MHz[IWL_RATE_COUNT] = {
+	0, 0, 0, 0, 77, 77, 127, 160, 184, 220, 242, 250, 257
+};
+
+static s32 expected_tpt_siso40MHzSGI[IWL_RATE_COUNT] = {
+	0, 0, 0, 0, 83, 83, 135, 169, 193, 229, 250, 257, 264
+};
+
+static s32 expected_tpt_mimo40MHz[IWL_RATE_COUNT] = {
+	0, 0, 0, 0, 123, 123, 182, 214, 235, 264, 279, 285, 289
+};
+
+static s32 expected_tpt_mimo40MHzSGI[IWL_RATE_COUNT] = {
+	0, 0, 0, 0, 131, 131, 191, 222, 242, 270, 284, 289, 293
+};
+
+static int iwl_lq_sync_callback(struct iwl_priv *priv,
+				struct iwl_cmd *cmd, struct sk_buff *skb)
+{
+	/*We didn't cache the SKB; let the caller free it */
+	return 1;
+}
+
+static inline u8 iwl_rate_get_rate(u32 rate_n_flags)
+{
+	return (u8)(rate_n_flags & 0xFF);
+}
+
+static int rs_send_lq_cmd(struct iwl_priv *priv,
+			  struct iwl_link_quality_cmd *lq, u8 flags)
+{
+#ifdef CONFIG_IWLWIFI_DEBUG
+	int i;
+#endif
+	int rc = -1;
+
+	struct iwl_host_cmd cmd = {
+		.id = REPLY_TX_LINK_QUALITY_CMD,
+		.len = sizeof(struct iwl_link_quality_cmd),
+		.meta.flags = flags,
+		.data = lq,
+	};
+
+	if ((lq->sta_id == 0xFF) &&
+	    (priv->iw_mode == IEEE80211_IF_TYPE_IBSS))
+		return rc;
+
+	if (lq->sta_id == 0xFF)
+		lq->sta_id = IWL_AP_ID;
+
+	IWL_DEBUG_RATE("lq station id 0x%x\n", lq->sta_id);
+	IWL_DEBUG_RATE("lq dta 0x%X 0x%X\n",
+		       lq->general_params.single_stream_ant_msk,
+		       lq->general_params.dual_stream_ant_msk);
+#ifdef CONFIG_IWLWIFI_DEBUG
+	for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
+		IWL_DEBUG_RATE("lq index %d 0x%X\n",
+				i, lq->rs_table[i].rate_n_flags);
+#endif
+
+	if (flags & CMD_ASYNC)
+		cmd.meta.u.callback = iwl_lq_sync_callback;
+
+	if (iwl_is_associated(priv) && priv->assoc_station_added &&
+	    priv->lq_mngr.lq_ready)
+		rc = iwl_send_cmd(priv, &cmd);
+
+	return rc;
+}
+
+static int rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
+{
+	window->data = 0;
+	window->success_counter = 0;
+	window->success_ratio = IWL_INVALID_VALUE;
+	window->counter = 0;
+	window->average_tpt = IWL_INVALID_VALUE;
+	window->stamp = 0;
+
+	return 0;
+}
+
+static int rs_collect_tx_data(struct iwl_rate_scale_data *windows,
+			      int scale_index, s32 tpt, u32 status)
+{
+	int rc = 0;
+	struct iwl_rate_scale_data *window = NULL;
+	u64 mask;
+	u8 win_size = IWL_RATE_MAX_WINDOW;
+	s32 fail_count;
+
+	if (scale_index < 0)
+		return -1;
+
+	if (scale_index >= IWL_RATE_COUNT)
+		return -1;
+
+	window = &(windows[scale_index]);
+
+	if (window->counter >= win_size) {
+
+		window->counter = win_size - 1;
+		mask = 1;
+		mask = (mask << (win_size - 1));
+		if ((window->data & mask)) {
+			window->data &= ~mask;
+			window->success_counter = window->success_counter - 1;
+		}
+	}
+
+	window->counter = window->counter + 1;
+	mask = window->data;
+	window->data = (mask << 1);
+	if (status != 0) {
+		window->success_counter = window->success_counter + 1;
+		window->data |= 0x1;
+	}
+
+	if (window->counter > 0)
+		window->success_ratio = 128 * (100 * window->success_counter)
+					/ window->counter;
+	else
+		window->success_ratio = IWL_INVALID_VALUE;
+
+	fail_count = window->counter - window->success_counter;
+
+	if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
+	    (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
+		window->average_tpt = (window->success_ratio * tpt + 64) / 128;
+	else
+		window->average_tpt = IWL_INVALID_VALUE;
+
+	window->stamp = jiffies;
+
+	return rc;
+}
+
+int static rs_mcs_from_tbl(struct iwl_rate *mcs_rate,
+			   struct iwl_scale_tbl_info *tbl,
+			   int index, u8 use_green)
+{
+	int rc = 0;
+
+	if (is_legacy(tbl->lq_type)) {
+		mcs_rate->rate_n_flags = iwl_rates[index].plcp;
+		if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
+			mcs_rate->rate_n_flags |= RATE_MCS_CCK_MSK;
+
+	} else if (is_siso(tbl->lq_type)) {
+		if (index > IWL_LAST_OFDM_RATE)
+			index = IWL_LAST_OFDM_RATE;
+		 mcs_rate->rate_n_flags = iwl_rates[index].plcp_siso |
+					  RATE_MCS_HT_MSK;
+	} else {
+		if (index > IWL_LAST_OFDM_RATE)
+			index = IWL_LAST_OFDM_RATE;
+		mcs_rate->rate_n_flags = iwl_rates[index].plcp_mimo |
+					 RATE_MCS_HT_MSK;
+	}
+
+	switch (tbl->antenna_type) {
+	case ANT_BOTH:
+		mcs_rate->rate_n_flags |= RATE_MCS_ANT_AB_MSK;
+		break;
+	case ANT_MAIN:
+		mcs_rate->rate_n_flags |= RATE_MCS_ANT_A_MSK;
+		break;
+	case ANT_AUX:
+		mcs_rate->rate_n_flags |= RATE_MCS_ANT_B_MSK;
+		break;
+	case ANT_NONE:
+		break;
+	}
+
+	if (is_legacy(tbl->lq_type))
+		return rc;
+
+	if (tbl->is_fat) {
+		if (tbl->is_dup)
+			mcs_rate->rate_n_flags |= RATE_MCS_DUP_MSK;
+		else
+			mcs_rate->rate_n_flags |= RATE_MCS_FAT_MSK;
+	}
+	if (tbl->is_SGI)
+		mcs_rate->rate_n_flags |= RATE_MCS_SGI_MSK;
+
+	if (use_green) {
+		mcs_rate->rate_n_flags |= RATE_MCS_GF_MSK;
+		if (is_siso(tbl->lq_type))
+			mcs_rate->rate_n_flags &= ~RATE_MCS_SGI_MSK;
+	}
+	return rc;
+}
+
+static int rs_get_tbl_info_from_mcs(const struct iwl_rate *mcs_rate,
+				    int phymode, struct iwl_scale_tbl_info *tbl,
+				    int *rate_idx)
+{
+	int index;
+	u32 ant_msk;
+
+	index = iwl_rate_index_from_plcp(mcs_rate->rate_n_flags);
+
+	if (index  == IWL_RATE_INVALID) {
+		*rate_idx = -1;
+		return -1;
+	}
+	tbl->is_SGI = 0;
+	tbl->is_fat = 0;
+	tbl->is_dup = 0;
+	tbl->antenna_type = ANT_BOTH;
+
+	if (!(mcs_rate->rate_n_flags & RATE_MCS_HT_MSK)) {
+		ant_msk = (mcs_rate->rate_n_flags & RATE_MCS_ANT_AB_MSK);
+
+		if (ant_msk == RATE_MCS_ANT_AB_MSK)
+			tbl->lq_type = LQ_NONE;
+		else {
+
+			if (phymode == MODE_IEEE80211A)
+				tbl->lq_type = LQ_A;
+			else
+				tbl->lq_type = LQ_G;
+
+			if (mcs_rate->rate_n_flags & RATE_MCS_ANT_A_MSK)
+				tbl->antenna_type = ANT_MAIN;
+			else
+				tbl->antenna_type = ANT_AUX;
+		}
+		*rate_idx = index;
+
+	} else if (iwl_rate_get_rate(mcs_rate->rate_n_flags)
+					<= IWL_RATE_SISO_60M_PLCP) {
+		tbl->lq_type = LQ_SISO;
+
+		ant_msk = (mcs_rate->rate_n_flags & RATE_MCS_ANT_AB_MSK);
+		if (ant_msk == RATE_MCS_ANT_AB_MSK)
+			tbl->lq_type = LQ_NONE;
+		else {
+			if (mcs_rate->rate_n_flags & RATE_MCS_ANT_A_MSK)
+				tbl->antenna_type = ANT_MAIN;
+			else
+				tbl->antenna_type = ANT_AUX;
+		}
+		if (mcs_rate->rate_n_flags & RATE_MCS_SGI_MSK)
+			tbl->is_SGI = 1;
+
+		if ((mcs_rate->rate_n_flags & RATE_MCS_FAT_MSK) ||
+		    (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK))
+			tbl->is_fat = 1;
+
+		if (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK)
+			tbl->is_dup = 1;
+
+		*rate_idx = index;
+	} else {
+		tbl->lq_type = LQ_MIMO;
+		if (mcs_rate->rate_n_flags & RATE_MCS_SGI_MSK)
+			tbl->is_SGI = 1;
+
+		if ((mcs_rate->rate_n_flags & RATE_MCS_FAT_MSK) ||
+		    (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK))
+			tbl->is_fat = 1;
+
+		if (mcs_rate->rate_n_flags & RATE_MCS_DUP_MSK)
+			tbl->is_dup = 1;
+		*rate_idx = index;
+	}
+	return 0;
+}
+
+static inline void rs_toggle_antenna(struct iwl_rate *new_rate,
+				     struct iwl_scale_tbl_info *tbl)
+{
+	if (tbl->antenna_type == ANT_AUX) {
+		tbl->antenna_type = ANT_MAIN;
+		new_rate->rate_n_flags &= ~RATE_MCS_ANT_B_MSK;
+		new_rate->rate_n_flags |= RATE_MCS_ANT_A_MSK;
+	} else {
+		tbl->antenna_type = ANT_AUX;
+		new_rate->rate_n_flags &= ~RATE_MCS_ANT_A_MSK;
+		new_rate->rate_n_flags |= RATE_MCS_ANT_B_MSK;
+	}
+}
+
+static inline s8 rs_use_green(struct iwl_priv *priv)
+{
+	s8 rc = 0;
+#ifdef CONFIG_IWLWIFI_HT
+	if (!priv->is_ht_enabled || !priv->current_assoc_ht.is_ht)
+		return 0;
+
+	if ((priv->current_assoc_ht.is_green_field) &&
+	    !(priv->current_assoc_ht.operating_mode & 0x4))
+		rc = 1;
+#endif	/*CONFIG_IWLWIFI_HT */
+	return rc;
+}
+
+/**
+ * rs_get_supported_rates - get the available rates
+ *
+ * if management frame or broadcast frame only return
+ * basic available rates.
+ *
+ */
+static void rs_get_supported_rates(struct iwl_rate_scale_priv *lq_data,
+				   struct ieee80211_hdr *hdr,
+				   enum iwl_table_type rate_type,
+				   u16 *data_rate)
+{
+	if (is_legacy(rate_type))
+		*data_rate = lq_data->active_rate;
+	else {
+		if (is_siso(rate_type))
+			*data_rate = lq_data->active_siso_rate;
+		else
+			*data_rate = lq_data->active_mimo_rate;
+	}
+
+	if (hdr && is_multicast_ether_addr(hdr->addr1) &&
+	    lq_data->active_rate_basic)
+		*data_rate = lq_data->active_rate_basic;
+}
+
+static u16 rs_get_adjacent_rate(u8 index, u16 rate_mask, int rate_type)
+{
+	u8 high = IWL_RATE_INVALID;
+	u8 low = IWL_RATE_INVALID;
+
+	/* 802.11A or ht walks to the next literal adjascent rate in
+	 * the rate table */
+	if (is_a_band(rate_type) || !is_legacy(rate_type)) {
+		int i;
+		u32 mask;
+
+		/* Find the previous rate that is in the rate mask */
+		i = index - 1;
+		for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
+			if (rate_mask & mask) {
+				low = i;
+				break;
+			}
+		}
+
+		/* Find the next rate that is in the rate mask */
+		i = index + 1;
+		for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
+			if (rate_mask & mask) {
+				high = i;
+				break;
+			}
+		}
+
+		return (high << 8) | low;
+	}
+
+	low = index;
+	while (low != IWL_RATE_INVALID) {
+		low = iwl_rates[low].prev_rs;
+		if (low == IWL_RATE_INVALID)
+			break;
+		if (rate_mask & (1 << low))
+			break;
+		IWL_DEBUG_RATE("Skipping masked lower rate: %d\n", low);
+	}
+
+	high = index;
+	while (high != IWL_RATE_INVALID) {
+		high = iwl_rates[high].next_rs;
+		if (high == IWL_RATE_INVALID)
+			break;
+		if (rate_mask & (1 << high))
+			break;
+		IWL_DEBUG_RATE("Skipping masked higher rate: %d\n", high);
+	}
+
+	return (high << 8) | low;
+}
+
+static int rs_get_lower_rate(struct iwl_rate_scale_priv *lq_data,
+			     struct iwl_scale_tbl_info *tbl, u8 scale_index,
+			     u8 ht_possible, struct iwl_rate *mcs_rate,
+			     struct sta_info *sta)
+{
+	u8 is_green = lq_data->is_green;
+	s32 low;
+	u16 rate_mask;
+	u16 high_low;
+	u8 switch_to_legacy = 0;
+
+	/* check if we need to switch from HT to legacy rates.
+	 * assumption is that mandatory rates (1Mbps or 6Mbps)
+	 * are always supported (spec demand) */
+	if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
+		switch_to_legacy = 1;
+		scale_index = rs_ht_to_legacy[scale_index];
+		if (lq_data->phymode == MODE_IEEE80211A)
+			tbl->lq_type = LQ_A;
+		else
+			tbl->lq_type = LQ_G;
+
+		if ((tbl->antenna_type == ANT_BOTH) ||
+		    (tbl->antenna_type == ANT_NONE))
+			tbl->antenna_type = ANT_MAIN;
+
+		tbl->is_fat = 0;
+		tbl->is_SGI = 0;
+	}
+
+	rs_get_supported_rates(lq_data, NULL, tbl->lq_type, &rate_mask);
+
+	/* mask with station rate restriction */
+	if (is_legacy(tbl->lq_type)) {
+		if (lq_data->phymode == (u8) MODE_IEEE80211A)
+			rate_mask  = (u16)(rate_mask &
+			   (sta->supp_rates << IWL_FIRST_OFDM_RATE));
+		else
+			rate_mask = (u16)(rate_mask & sta->supp_rates);
+	}
+
+	/* if we did switched from HT to legacy check current rate */
+	if ((switch_to_legacy) &&
+	    (rate_mask & (1 << scale_index))) {
+		rs_mcs_from_tbl(mcs_rate, tbl, scale_index, is_green);
+		return 0;
+	}
+
+	high_low = rs_get_adjacent_rate(scale_index, rate_mask, tbl->lq_type);
+	low = high_low & 0xff;
+
+	if (low != IWL_RATE_INVALID)
+		rs_mcs_from_tbl(mcs_rate, tbl, low, is_green);
+	else
+		rs_mcs_from_tbl(mcs_rate, tbl, scale_index, is_green);
+
+	return 0;
+}
+
+static void rs_tx_status(void *priv_rate,
+			 struct net_device *dev,
+			 struct sk_buff *skb,
+			 struct ieee80211_tx_status *tx_resp)
+{
+	int status;
+	u8 retries;
+	int rs_index, index = 0;
+	struct iwl_rate_scale_priv *lq;
+	struct iwl_link_quality_cmd *table;
+	struct sta_info *sta;
+	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
+	struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
+	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
+	struct iwl_rate_scale_data *window = NULL;
+	struct iwl_rate_scale_data *search_win = NULL;
+	struct iwl_rate tx_mcs;
+	struct iwl_scale_tbl_info tbl_type;
+	struct iwl_scale_tbl_info *curr_tbl, *search_tbl;
+	u8 active_index = 0;
+	u16 fc = le16_to_cpu(hdr->frame_control);
+	s32 tpt = 0;
+
+	IWL_DEBUG_RATE("get frame ack response, update rate scale window\n");
+
+	if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1))
+		return;
+
+	retries = tx_resp->retry_count;
+
+	if (retries > 15)
+		retries = 15;
+
+
+	sta = sta_info_get(local, hdr->addr1);
+
+	if (!sta || !sta->rate_ctrl_priv) {
+		if (sta)
+			sta_info_put(sta);
+		return;
+	}
+
+	lq = (struct iwl_rate_scale_priv *)sta->rate_ctrl_priv;
+
+	if (!priv->lq_mngr.lq_ready)
+		return;
+
+	if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) && !lq->ibss_sta_added)
+		return;
+
+	table = &lq->lq;
+	active_index = lq->active_tbl;
+
+	lq->antenna = (lq->valid_antenna & local->hw.conf.antenna_sel_tx);
+	if (!lq->antenna)
+		lq->antenna = lq->valid_antenna;
+
+	lq->antenna = lq->valid_antenna;
+	curr_tbl = &(lq->lq_info[active_index]);
+	search_tbl = &(lq->lq_info[(1 - active_index)]);
+	window = (struct iwl_rate_scale_data *)
+	    &(curr_tbl->win[0]);
+	search_win = (struct iwl_rate_scale_data *)
+	    &(search_tbl->win[0]);
+
+	tx_mcs.rate_n_flags = tx_resp->control.tx_rate;
+
+	rs_get_tbl_info_from_mcs(&tx_mcs, priv->phymode,
+				  &tbl_type, &rs_index);
+	if ((rs_index < 0) || (rs_index >= IWL_RATE_COUNT)) {
+		IWL_DEBUG_RATE("bad rate index at: %d rate 0x%X\n",
+			     rs_index, tx_mcs.rate_n_flags);
+		sta_info_put(sta);
+		return;
+	}
+
+	if (retries &&
+	    (tx_mcs.rate_n_flags !=
+				le32_to_cpu(table->rs_table[0].rate_n_flags))) {
+		IWL_DEBUG_RATE("initial rate does not match 0x%x 0x%x\n",
+				tx_mcs.rate_n_flags,
+				le32_to_cpu(table->rs_table[0].rate_n_flags));
+		sta_info_put(sta);
+		return;
+	}
+
+	while (retries) {
+		tx_mcs.rate_n_flags =
+		    le32_to_cpu(table->rs_table[index].rate_n_flags);
+		rs_get_tbl_info_from_mcs(&tx_mcs, priv->phymode,
+					  &tbl_type, &rs_index);
+
+		if ((tbl_type.lq_type == search_tbl->lq_type) &&
+		    (tbl_type.antenna_type == search_tbl->antenna_type) &&
+		    (tbl_type.is_SGI == search_tbl->is_SGI)) {
+			if (search_tbl->expected_tpt)
+				tpt = search_tbl->expected_tpt[rs_index];
+			else
+				tpt = 0;
+			rs_collect_tx_data(search_win,
+					    rs_index, tpt, 0);
+		} else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
+			   (tbl_type.antenna_type == curr_tbl->antenna_type) &&
+			   (tbl_type.is_SGI == curr_tbl->is_SGI)) {
+			if (curr_tbl->expected_tpt)
+				tpt = curr_tbl->expected_tpt[rs_index];
+			else
+				tpt = 0;
+			rs_collect_tx_data(window, rs_index, tpt, 0);
+		}
+		if (lq->stay_in_tbl)
+			lq->total_failed++;
+		--retries;
+		index++;
+
+	}
+
+	if (!tx_resp->retry_count)
+		tx_mcs.rate_n_flags = tx_resp->control.tx_rate;
+	else
+		tx_mcs.rate_n_flags =
+			le32_to_cpu(table->rs_table[index].rate_n_flags);
+
+	rs_get_tbl_info_from_mcs(&tx_mcs, priv->phymode,
+				  &tbl_type, &rs_index);
+
+	if (tx_resp->flags & IEEE80211_TX_STATUS_ACK)
+		status = 1;
+	else
+		status = 0;
+
+	if ((tbl_type.lq_type == search_tbl->lq_type) &&
+	    (tbl_type.antenna_type == search_tbl->antenna_type) &&
+	    (tbl_type.is_SGI == search_tbl->is_SGI)) {
+		if (search_tbl->expected_tpt)
+			tpt = search_tbl->expected_tpt[rs_index];
+		else
+			tpt = 0;
+		rs_collect_tx_data(search_win,
+				    rs_index, tpt, status);
+	} else if ((tbl_type.lq_type == curr_tbl->lq_type) &&
+		   (tbl_type.antenna_type == curr_tbl->antenna_type) &&
+		   (tbl_type.is_SGI == curr_tbl->is_SGI)) {
+		if (curr_tbl->expected_tpt)
+			tpt = curr_tbl->expected_tpt[rs_index];
+		else
+			tpt = 0;
+		rs_collect_tx_data(window, rs_index, tpt, status);
+	}
+
+	if (lq->stay_in_tbl) {
+		if (status)
+			lq->total_success++;
+		else
+			lq->total_failed++;
+	}
+
+	rs_rate_scale_perform(priv, dev, hdr, sta);
+	sta_info_put(sta);
+	return;
+}
+
+static u8 rs_is_ant_connected(u8 valid_antenna,
+			      enum iwl_antenna_type antenna_type)
+{
+	if (antenna_type == ANT_AUX)
+		return ((valid_antenna & 0x2) ? 1:0);
+	else if (antenna_type == ANT_MAIN)
+		return ((valid_antenna & 0x1) ? 1:0);
+	else if (antenna_type == ANT_BOTH) {
+		if ((valid_antenna & 0x3) == 0x3)
+			return 1;
+		else
+			return 0;
+	}
+
+	return 1;
+}
+
+static u8 rs_is_other_ant_connected(u8 valid_antenna,
+				    enum iwl_antenna_type antenna_type)
+{
+	if (antenna_type == ANT_AUX)
+		return (rs_is_ant_connected(valid_antenna, ANT_MAIN));
+	else
+		return (rs_is_ant_connected(valid_antenna, ANT_AUX));
+
+	return 0;
+}
+
+static void rs_set_stay_in_table(u8 is_legacy,
+				 struct iwl_rate_scale_priv *lq_data)
+{
+	IWL_DEBUG_HT("we are staying in the same table\n");
+	lq_data->stay_in_tbl = 1;
+	if (is_legacy) {
+		lq_data->table_count_limit = IWL_LEGACY_TABLE_COUNT;
+		lq_data->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
+		lq_data->max_success_limit = IWL_LEGACY_TABLE_COUNT;
+	} else {
+		lq_data->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
+		lq_data->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
+		lq_data->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
+	}
+	lq_data->table_count = 0;
+	lq_data->total_failed = 0;
+	lq_data->total_success = 0;
+}
+
+static void rs_get_expected_tpt_table(struct iwl_rate_scale_priv *lq_data,
+				      struct iwl_scale_tbl_info *tbl)
+{
+	if (is_legacy(tbl->lq_type)) {
+		if (!is_a_band(tbl->lq_type))
+			tbl->expected_tpt = expected_tpt_G;
+		else
+			tbl->expected_tpt = expected_tpt_A;
+	} else if (is_siso(tbl->lq_type)) {
+		if (tbl->is_fat && !lq_data->is_dup)
+			if (tbl->is_SGI)
+				tbl->expected_tpt = expected_tpt_siso40MHzSGI;
+			else
+				tbl->expected_tpt = expected_tpt_siso40MHz;
+		else if (tbl->is_SGI)
+			tbl->expected_tpt = expected_tpt_siso20MHzSGI;
+		else
+			tbl->expected_tpt = expected_tpt_siso20MHz;
+
+	} else if (is_mimo(tbl->lq_type)) {
+		if (tbl->is_fat && !lq_data->is_dup)
+			if (tbl->is_SGI)
+				tbl->expected_tpt = expected_tpt_mimo40MHzSGI;
+			else
+				tbl->expected_tpt = expected_tpt_mimo40MHz;
+		else if (tbl->is_SGI)
+			tbl->expected_tpt = expected_tpt_mimo20MHzSGI;
+		else
+			tbl->expected_tpt = expected_tpt_mimo20MHz;
+	} else
+		tbl->expected_tpt = expected_tpt_G;
+}
+
+#ifdef CONFIG_IWLWIFI_HT
+static s32 rs_get_best_rate(struct iwl_priv *priv,
+			    struct iwl_rate_scale_priv *lq_data,
+			    struct iwl_scale_tbl_info *tbl,
+			    u16 rate_mask, s8 index, s8 rate)
+{
+	struct iwl_scale_tbl_info *active_tbl =
+	    &(lq_data->lq_info[lq_data->active_tbl]);
+	s32 new_rate, high, low, start_hi;
+	s32 active_sr = active_tbl->win[index].success_ratio;
+	s32 *tpt_tbl = tbl->expected_tpt;
+	s32 active_tpt = active_tbl->expected_tpt[index];
+	u16 high_low;
+
+	new_rate = high = low = start_hi = IWL_RATE_INVALID;
+
+	for (; ;) {
+		high_low = rs_get_adjacent_rate(rate, rate_mask, tbl->lq_type);
+
+		low = high_low & 0xff;
+		high = (high_low >> 8) & 0xff;
+
+		if ((((100 * tpt_tbl[rate]) > lq_data->last_tpt) &&
+		     ((active_sr > IWL_RATE_DECREASE_TH) &&
+		      (active_sr <= IWL_RATE_HIGH_TH) &&
+		      (tpt_tbl[rate] <= active_tpt))) ||
+		    ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
+		     (tpt_tbl[rate] > active_tpt))) {
+
+			if (start_hi != IWL_RATE_INVALID) {
+				new_rate = start_hi;
+				break;
+			}
+			new_rate = rate;
+			if (low != IWL_RATE_INVALID)
+				rate = low;
+			else
+				break;
+		} else {
+			if (new_rate != IWL_RATE_INVALID)
+				break;
+			else if (high != IWL_RATE_INVALID) {
+				start_hi = high;
+				rate = high;
+			} else {
+				new_rate = rate;
+				break;
+			}
+		}
+	}
+
+	return new_rate;
+}
+#endif				/* CONFIG_IWLWIFI_HT */
+
+static inline u8 rs_is_both_ant_supp(u8 valid_antenna)
+{
+	return (rs_is_ant_connected(valid_antenna, ANT_BOTH));
+}
+
+static int rs_switch_to_mimo(struct iwl_priv *priv,
+			     struct iwl_rate_scale_priv *lq_data,
+			     struct iwl_scale_tbl_info *tbl, int index)
+{
+	int rc = -1;
+#ifdef CONFIG_IWLWIFI_HT
+	u16 rate_mask;
+	s32 rate;
+	s8 is_green = lq_data->is_green;
+
+	if (!priv->is_ht_enabled || !priv->current_assoc_ht.is_ht)
+		return -1;
+
+	IWL_DEBUG_HT("LQ: try to switch to MIMO\n");
+	tbl->lq_type = LQ_MIMO;
+	rs_get_supported_rates(lq_data, NULL, tbl->lq_type,
+				&rate_mask);
+
+	if (priv->current_assoc_ht.tx_mimo_ps_mode == IWL_MIMO_PS_STATIC)
+		return -1;
+
+	if (!rs_is_both_ant_supp(lq_data->antenna))
+		return -1;
+
+	rc = 0;
+	tbl->is_dup = lq_data->is_dup;
+	tbl->action = 0;
+	if (priv->current_channel_width == IWL_CHANNEL_WIDTH_40MHZ)
+		tbl->is_fat = 1;
+	else
+		tbl->is_fat = 0;
+
+	if (tbl->is_fat) {
+		if (priv->current_assoc_ht.sgf & HT_SHORT_GI_40MHZ_ONLY)
+			tbl->is_SGI = 1;
+		else
+			tbl->is_SGI = 0;
+	} else if (priv->current_assoc_ht.sgf & HT_SHORT_GI_20MHZ_ONLY)
+		tbl->is_SGI = 1;
+	else
+		tbl->is_SGI = 0;
+
+	rs_get_expected_tpt_table(lq_data, tbl);
+
+	rate = rs_get_best_rate(priv, lq_data, tbl, rate_mask, index, index);
+
+	IWL_DEBUG_HT("LQ: MIMO best rate %d mask %X\n", rate, rate_mask);
+	if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask))
+		return -1;
+	rs_mcs_from_tbl(&tbl->current_rate, tbl, rate, is_green);
+
+	IWL_DEBUG_HT("LQ: Switch to new mcs %X index is green %X\n",
+		     tbl->current_rate.rate_n_flags, is_green);
+
+#endif				/*CONFIG_IWLWIFI_HT */
+	return rc;
+}
+
+static int rs_switch_to_siso(struct iwl_priv *priv,
+			     struct iwl_rate_scale_priv *lq_data,
+			     struct iwl_scale_tbl_info *tbl, int index)
+{
+	int rc = -1;
+#ifdef CONFIG_IWLWIFI_HT
+	u16 rate_mask;
+	u8 is_green = lq_data->is_green;
+	s32 rate;
+
+	IWL_DEBUG_HT("LQ: try to switch to SISO\n");
+	if (!priv->is_ht_enabled || !priv->current_assoc_ht.is_ht)
+		return -1;
+
+	rc = 0;
+	tbl->is_dup = lq_data->is_dup;
+	tbl->lq_type = LQ_SISO;
+	tbl->action = 0;
+	rs_get_supported_rates(lq_data, NULL, tbl->lq_type,
+				&rate_mask);
+
+	if (priv->current_channel_width == IWL_CHANNEL_WIDTH_40MHZ)
+		tbl->is_fat = 1;
+	else
+		tbl->is_fat = 0;
+
+	if (tbl->is_fat) {
+		if (priv->current_assoc_ht.sgf & HT_SHORT_GI_40MHZ_ONLY)
+			tbl->is_SGI = 1;
+		else
+			tbl->is_SGI = 0;
+	} else if (priv->current_assoc_ht.sgf & HT_SHORT_GI_20MHZ_ONLY)
+		tbl->is_SGI = 1;
+	else
+		tbl->is_SGI = 0;
+
+	if (is_green)
+		tbl->is_SGI = 0;
+
+	rs_get_expected_tpt_table(lq_data, tbl);
+	rate = rs_get_best_rate(priv, lq_data, tbl, rate_mask, index, index);
+
+	IWL_DEBUG_HT("LQ: get best rate %d mask %X\n", rate, rate_mask);
+	if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
+		IWL_DEBUG_HT("can not switch with index %d rate mask %x\n",
+			     rate, rate_mask);
+		return -1;
+	}
+	rs_mcs_from_tbl(&tbl->current_rate, tbl, rate, is_green);
+	IWL_DEBUG_HT("LQ: Switch to new mcs %X index is green %X\n",
+		     tbl->current_rate.rate_n_flags, is_green);
+
+#endif				/*CONFIG_IWLWIFI_HT */
+	return rc;
+}
+
+static int rs_move_legacy_other(struct iwl_priv *priv,
+				struct iwl_rate_scale_priv *lq_data,
+				int index)
+{
+	int rc = 0;
+	struct iwl_scale_tbl_info *tbl =
+	    &(lq_data->lq_info[lq_data->active_tbl]);
+	struct iwl_scale_tbl_info *search_tbl =
+	    &(lq_data->lq_info[(1 - lq_data->active_tbl)]);
+	struct iwl_rate_scale_data *window = &(tbl->win[index]);
+	u32 sz = (sizeof(struct iwl_scale_tbl_info) -
+		  (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
+	u8 start_action = tbl->action;
+
+	for (; ;) {
+		switch (tbl->action) {
+		case IWL_LEGACY_SWITCH_ANTENNA:
+			IWL_DEBUG_HT("LQ Legacy switch Antenna\n");
+
+			search_tbl->lq_type = LQ_NONE;
+			lq_data->action_counter++;
+			if (window->success_ratio >= IWL_RS_GOOD_RATIO)
+				break;
+			if (!rs_is_other_ant_connected(lq_data->antenna,
+							tbl->antenna_type))
+				break;
+
+			memcpy(search_tbl, tbl, sz);
+
+			rs_toggle_antenna(&(search_tbl->current_rate),
+					   search_tbl);
+			rs_get_expected_tpt_table(lq_data, search_tbl);
+			lq_data->search_better_tbl = 1;
+			goto out;
+
+		case IWL_LEGACY_SWITCH_SISO:
+			IWL_DEBUG_HT("LQ: Legacy switch to SISO\n");
+			memcpy(search_tbl, tbl, sz);
+			search_tbl->lq_type = LQ_SISO;
+			search_tbl->is_SGI = 0;
+			search_tbl->is_fat = 0;
+			rc = rs_switch_to_siso(priv, lq_data, search_tbl,
+					       index);
+			if (!rc) {
+				lq_data->search_better_tbl = 1;
+				lq_data->action_counter = 0;
+			}
+			if (!rc)
+				goto out;
+
+			break;
+		case IWL_LEGACY_SWITCH_MIMO:
+			IWL_DEBUG_HT("LQ: Legacy switch MIMO\n");
+			memcpy(search_tbl, tbl, sz);
+			search_tbl->lq_type = LQ_MIMO;
+			search_tbl->is_SGI = 0;
+			search_tbl->is_fat = 0;
+			search_tbl->antenna_type = ANT_BOTH;
+			rc = rs_switch_to_mimo(priv, lq_data, search_tbl,
+					       index);
+			if (!rc) {
+				lq_data->search_better_tbl = 1;
+				lq_data->action_counter = 0;
+			}
+			if (!rc)
+				goto out;
+			break;
+		}
+		tbl->action++;
+		if (tbl->action > IWL_LEGACY_SWITCH_MIMO)
+			tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
+
+		if (tbl->action == start_action)
+			break;
+
+	}
+	return 0;
+
+ out:
+	tbl->action++;
+	if (tbl->action > IWL_LEGACY_SWITCH_MIMO)
+		tbl->action = IWL_LEGACY_SWITCH_ANTENNA;
+	return 0;
+
+}
+
+static int rs_move_siso_to_other(struct iwl_priv *priv,
+				 struct iwl_rate_scale_priv *lq_data,
+				 int index)
+{
+	int rc = -1;
+	u8 is_green = lq_data->is_green;
+	struct iwl_scale_tbl_info *tbl =
+	    &(lq_data->lq_info[lq_data->active_tbl]);
+	struct iwl_scale_tbl_info *search_tbl =
+	    &(lq_data->lq_info[(1 - lq_data->active_tbl)]);
+	struct iwl_rate_scale_data *window = &(tbl->win[index]);
+	u32 sz = (sizeof(struct iwl_scale_tbl_info) -
+		  (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
+	u8 start_action = tbl->action;
+
+	for (;;) {
+		lq_data->action_counter++;
+		switch (tbl->action) {
+		case IWL_SISO_SWITCH_ANTENNA:
+			IWL_DEBUG_HT("LQ: SISO SWITCH ANTENNA SISO\n");
+			search_tbl->lq_type = LQ_NONE;
+			if (window->success_ratio >= IWL_RS_GOOD_RATIO)
+				break;
+			if (!rs_is_other_ant_connected(lq_data->antenna,
+						       tbl->antenna_type))
+				break;
+
+			memcpy(search_tbl, tbl, sz);
+			search_tbl->action = IWL_SISO_SWITCH_MIMO;
+			rs_toggle_antenna(&(search_tbl->current_rate),
+					   search_tbl);
+			lq_data->search_better_tbl = 1;
+
+			goto out;
+
+		case IWL_SISO_SWITCH_MIMO:
+			IWL_DEBUG_HT("LQ: SISO SWITCH TO MIMO FROM SISO\n");
+			memcpy(search_tbl, tbl, sz);
+			search_tbl->lq_type = LQ_MIMO;
+			search_tbl->is_SGI = 0;
+			search_tbl->is_fat = 0;
+			search_tbl->antenna_type = ANT_BOTH;
+			rc = rs_switch_to_mimo(priv, lq_data, search_tbl,
+					       index);
+			if (!rc)
+				lq_data->search_better_tbl = 1;
+
+			if (!rc)
+				goto out;
+			break;
+		case IWL_SISO_SWITCH_GI:
+			IWL_DEBUG_HT("LQ: SISO SWITCH TO GI\n");
+			memcpy(search_tbl, tbl, sz);
+			search_tbl->action = 0;
+			if (search_tbl->is_SGI)
+				search_tbl->is_SGI = 0;
+			else if (!is_green)
+				search_tbl->is_SGI = 1;
+			else
+				break;
+			lq_data->search_better_tbl = 1;
+			if ((tbl->lq_type == LQ_SISO) &&
+			    (tbl->is_SGI)) {
+				s32 tpt = lq_data->last_tpt / 100;
+				if (((!tbl->is_fat) &&
+				     (tpt >= expected_tpt_siso20MHz[index])) ||
+				    ((tbl->is_fat) &&
+				     (tpt >= expected_tpt_siso40MHz[index])))
+					lq_data->search_better_tbl = 0;
+			}
+			rs_get_expected_tpt_table(lq_data, search_tbl);
+			rs_mcs_from_tbl(&search_tbl->current_rate,
+					     search_tbl, index, is_green);
+			goto out;
+		}
+		tbl->action++;
+		if (tbl->action > IWL_SISO_SWITCH_GI)
+			tbl->action = IWL_SISO_SWITCH_ANTENNA;
+
+		if (tbl->action == start_action)
+			break;
+	}
+	return 0;
+
+ out:
+	tbl->action++;
+	if (tbl->action > IWL_SISO_SWITCH_GI)
+		tbl->action = IWL_SISO_SWITCH_ANTENNA;
+	return 0;
+}
+
+static int rs_move_mimo_to_other(struct iwl_priv *priv,
+				 struct iwl_rate_scale_priv *lq_data,
+				 int index)
+{
+	int rc = -1;
+	s8 is_green = lq_data->is_green;
+	struct iwl_scale_tbl_info *tbl =
+	    &(lq_data->lq_info[lq_data->active_tbl]);
+	struct iwl_scale_tbl_info *search_tbl =
+	    &(lq_data->lq_info[(1 - lq_data->active_tbl)]);
+	u32 sz = (sizeof(struct iwl_scale_tbl_info) -
+		  (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
+	u8 start_action = tbl->action;
+
+	for (;;) {
+		lq_data->action_counter++;
+		switch (tbl->action) {
+		case IWL_MIMO_SWITCH_ANTENNA_A:
+		case IWL_MIMO_SWITCH_ANTENNA_B:
+			IWL_DEBUG_HT("LQ: MIMO SWITCH TO SISO\n");
+			memcpy(search_tbl, tbl, sz);
+			search_tbl->lq_type = LQ_SISO;
+			search_tbl->is_SGI = 0;
+			search_tbl->is_fat = 0;
+			if (tbl->action == IWL_MIMO_SWITCH_ANTENNA_A)
+				search_tbl->antenna_type = ANT_MAIN;
+			else
+				search_tbl->antenna_type = ANT_AUX;
+
+			rc = rs_switch_to_siso(priv, lq_data, search_tbl,
+					       index);
+			if (!rc) {
+				lq_data->search_better_tbl = 1;
+				goto out;
+			}
+			break;
+
+		case IWL_MIMO_SWITCH_GI:
+			IWL_DEBUG_HT("LQ: MIMO SWITCH TO GI\n");
+			memcpy(search_tbl, tbl, sz);
+			search_tbl->lq_type = LQ_MIMO;
+			search_tbl->antenna_type = ANT_BOTH;
+			search_tbl->action = 0;
+			if (search_tbl->is_SGI)
+				search_tbl->is_SGI = 0;
+			else
+				search_tbl->is_SGI = 1;
+			lq_data->search_better_tbl = 1;
+			if ((tbl->lq_type == LQ_MIMO) &&
+			    (tbl->is_SGI)) {
+				s32 tpt = lq_data->last_tpt / 100;
+				if (((!tbl->is_fat) &&
+				     (tpt >= expected_tpt_mimo20MHz[index])) ||
+				    ((tbl->is_fat) &&
+				     (tpt >= expected_tpt_mimo40MHz[index])))
+					lq_data->search_better_tbl = 0;
+			}
+			rs_get_expected_tpt_table(lq_data, search_tbl);
+			rs_mcs_from_tbl(&search_tbl->current_rate,
+					     search_tbl, index, is_green);
+			goto out;
+
+		}
+		tbl->action++;
+		if (tbl->action > IWL_MIMO_SWITCH_GI)
+			tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
+
+		if (tbl->action == start_action)
+			break;
+	}
+
+	return 0;
+ out:
+	tbl->action++;
+	if (tbl->action > IWL_MIMO_SWITCH_GI)
+		tbl->action = IWL_MIMO_SWITCH_ANTENNA_A;
+	return 0;
+
+}
+
+static void rs_stay_in_table(struct iwl_rate_scale_priv *lq_data)
+{
+	struct iwl_scale_tbl_info *tbl;
+	int i;
+	int active_tbl;
+	int flush_interval_passed = 0;
+
+	active_tbl = lq_data->active_tbl;
+
+	tbl = &(lq_data->lq_info[active_tbl]);
+
+	if (lq_data->stay_in_tbl) {
+
+		if (lq_data->flush_timer)
+			flush_interval_passed =
+			    time_after(jiffies,
+				       (unsigned long)(lq_data->flush_timer +
+					IWL_RATE_SCALE_FLUSH_INTVL));
+
+		flush_interval_passed = 0;
+		if ((lq_data->total_failed > lq_data->max_failure_limit) ||
+		    (lq_data->total_success > lq_data->max_success_limit) ||
+		    ((!lq_data->search_better_tbl) && (lq_data->flush_timer)
+		     && (flush_interval_passed))) {
+			IWL_DEBUG_HT("LQ: stay is expired %d %d %d\n:",
+				     lq_data->total_failed,
+				     lq_data->total_success,
+				     flush_interval_passed);
+			lq_data->stay_in_tbl = 0;
+			lq_data->total_failed = 0;
+			lq_data->total_success = 0;
+			lq_data->flush_timer = 0;
+		} else if (lq_data->table_count > 0) {
+			lq_data->table_count++;
+			if (lq_data->table_count >=
+			    lq_data->table_count_limit) {
+				lq_data->table_count = 0;
+
+				IWL_DEBUG_HT("LQ: stay in table clear win\n");
+				for (i = 0; i < IWL_RATE_COUNT; i++)
+					rs_rate_scale_clear_window(
+						&(tbl->win[i]));
+			}
+		}
+
+		if (!lq_data->stay_in_tbl) {
+			for (i = 0; i < IWL_RATE_COUNT; i++)
+				rs_rate_scale_clear_window(&(tbl->win[i]));
+		}
+	}
+}
+
+static void rs_rate_scale_perform(struct iwl_priv *priv,
+				  struct net_device *dev,
+				  struct ieee80211_hdr *hdr,
+				  struct sta_info *sta)
+{
+	int low = IWL_RATE_INVALID;
+	int high = IWL_RATE_INVALID;
+	int index;
+	int i;
+	struct iwl_rate_scale_data *window = NULL;
+	int current_tpt = IWL_INVALID_VALUE;
+	int low_tpt = IWL_INVALID_VALUE;
+	int high_tpt = IWL_INVALID_VALUE;
+	u32 fail_count;
+	s8 scale_action = 0;
+	u16 fc, rate_mask;
+	u8 update_lq = 0;
+	struct iwl_rate_scale_priv *lq_data;
+	struct iwl_scale_tbl_info *tbl, *tbl1;
+	u16 rate_scale_index_msk = 0;
+	struct iwl_rate mcs_rate;
+	u8 is_green = 0;
+	u8 active_tbl = 0;
+	u8 done_search = 0;
+	u16 high_low;
+
+	IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
+
+	fc = le16_to_cpu(hdr->frame_control);
+	if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) {
+		/* Send management frames and broadcast/multicast data using
+		 * lowest rate. */
+		/* TODO: this could probably be improved.. */
+		return;
+	}
+
+	if (!sta || !sta->rate_ctrl_priv)
+		return;
+
+	if (!priv->lq_mngr.lq_ready) {
+		IWL_DEBUG_RATE("still rate scaling not ready\n");
+		return;
+	}
+	lq_data = (struct iwl_rate_scale_priv *)sta->rate_ctrl_priv;
+
+	if (!lq_data->search_better_tbl)
+		active_tbl = lq_data->active_tbl;
+	else
+		active_tbl = 1 - lq_data->active_tbl;
+
+	tbl = &(lq_data->lq_info[active_tbl]);
+	is_green = lq_data->is_green;
+
+	index = sta->last_txrate;
+
+	IWL_DEBUG_RATE("Rate scale index %d for type %d\n", index,
+		       tbl->lq_type);
+
+	rs_get_supported_rates(lq_data, hdr, tbl->lq_type,
+				&rate_mask);
+
+	IWL_DEBUG_RATE("mask 0x%04X \n", rate_mask);
+
+	/* mask with station rate restriction */
+	if (is_legacy(tbl->lq_type)) {
+		if (lq_data->phymode == (u8) MODE_IEEE80211A)
+			rate_scale_index_msk = (u16) (rate_mask &
+				(sta->supp_rates << IWL_FIRST_OFDM_RATE));
+		else
+			rate_scale_index_msk = (u16) (rate_mask &
+						      sta->supp_rates);
+
+	} else
+		rate_scale_index_msk = rate_mask;
+
+	if (!rate_scale_index_msk)
+		rate_scale_index_msk = rate_mask;
+
+	if (index < 0 || !((1 << index) & rate_scale_index_msk)) {
+		index = IWL_INVALID_VALUE;
+		update_lq = 1;
+
+		/* get the lowest availabe rate */
+		for (i = 0; i <= IWL_RATE_COUNT; i++) {
+			if ((1 << i) & rate_scale_index_msk)
+				index = i;
+		}
+
+		if (index == IWL_INVALID_VALUE) {
+			IWL_WARNING("Can not find a suitable rate\n");
+			return;
+		}
+	}
+
+	if (!tbl->expected_tpt)
+		rs_get_expected_tpt_table(lq_data, tbl);
+
+	window = &(tbl->win[index]);
+
+	fail_count = window->counter - window->success_counter;
+	if (((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
+	     (window->success_counter < IWL_RATE_MIN_SUCCESS_TH))
+	    || (tbl->expected_tpt == NULL)) {
+		IWL_DEBUG_RATE("LQ: still below TH succ %d total %d "
+			       "for index %d\n",
+			       window->success_counter, window->counter, index);
+		window->average_tpt = IWL_INVALID_VALUE;
+		rs_stay_in_table(lq_data);
+		if (update_lq) {
+			rs_mcs_from_tbl(&mcs_rate, tbl, index, is_green);
+			rs_fill_link_cmd(lq_data, &mcs_rate, &lq_data->lq, sta);
+			rs_send_lq_cmd(priv, &lq_data->lq, CMD_ASYNC);
+		}
+		goto out;
+
+	} else
+		window->average_tpt = ((window->success_ratio *
+					tbl->expected_tpt[index] + 64) / 128);
+
+	if (lq_data->search_better_tbl) {
+		int success_limit = IWL_RATE_SCALE_SWITCH;
+
+		if ((window->success_ratio > success_limit) ||
+		    (window->average_tpt > lq_data->last_tpt)) {
+			if (!is_legacy(tbl->lq_type)) {
+				IWL_DEBUG_HT("LQ: we are switching to HT"
+					     " rate suc %d current tpt %d"
+					     " old tpt %d\n",
+					     window->success_ratio,
+					     window->average_tpt,
+					     lq_data->last_tpt);
+				lq_data->enable_counter = 1;
+			}
+			lq_data->active_tbl = active_tbl;
+			current_tpt = window->average_tpt;
+		} else {
+			tbl->lq_type = LQ_NONE;
+			active_tbl = lq_data->active_tbl;
+			tbl = &(lq_data->lq_info[active_tbl]);
+
+			index = iwl_rate_index_from_plcp(
+				tbl->current_rate.rate_n_flags);
+
+			update_lq = 1;
+			current_tpt = lq_data->last_tpt;
+			IWL_DEBUG_HT("XXY GO BACK TO OLD TABLE\n");
+		}
+		lq_data->search_better_tbl = 0;
+		done_search = 1;
+		goto lq_update;
+	}
+
+	high_low = rs_get_adjacent_rate(index, rate_scale_index_msk,
+					tbl->lq_type);
+	low = high_low & 0xff;
+	high = (high_low >> 8) & 0xff;
+
+	current_tpt = window->average_tpt;
+
+	if (low != IWL_RATE_INVALID)
+		low_tpt = tbl->win[low].average_tpt;
+
+	if (high != IWL_RATE_INVALID)
+		high_tpt = tbl->win[high].average_tpt;
+
+
+	scale_action = 1;
+
+	if ((window->success_ratio <= IWL_RATE_DECREASE_TH) ||
+	    (current_tpt == 0)) {
+		IWL_DEBUG_RATE("decrease rate because of low success_ratio\n");
+		scale_action = -1;
+	} else if ((low_tpt == IWL_INVALID_VALUE) &&
+		   (high_tpt == IWL_INVALID_VALUE))
+		scale_action = 1;
+	else if ((low_tpt != IWL_INVALID_VALUE) &&
+		 (high_tpt != IWL_INVALID_VALUE) &&
+		 (low_tpt < current_tpt) &&
+		 (high_tpt < current_tpt))
+		scale_action = 0;
+	else {
+		if (high_tpt != IWL_INVALID_VALUE) {
+			if (high_tpt > current_tpt)
+				scale_action = 1;
+			else {
+				IWL_DEBUG_RATE
+				    ("decrease rate because of high tpt\n");
+				scale_action = -1;
+			}
+		} else if (low_tpt != IWL_INVALID_VALUE) {
+			if (low_tpt > current_tpt) {
+				IWL_DEBUG_RATE
+				    ("decrease rate because of low tpt\n");
+				scale_action = -1;
+			} else
+				scale_action = 1;
+		}
+	}
+
+	if (scale_action == -1) {
+		if ((low != IWL_RATE_INVALID) &&
+		    ((window->success_ratio > IWL_RATE_HIGH_TH) ||
+		     (current_tpt > (100 * tbl->expected_tpt[low]))))
+			scale_action = 0;
+	} else if ((scale_action == 1) &&
+		   (window->success_ratio < IWL_RATE_INCREASE_TH))
+		scale_action = 0;
+
+	switch (scale_action) {
+	case -1:
+		if (low != IWL_RATE_INVALID) {
+			update_lq = 1;
+			index = low;
+		}
+		break;
+	case 1:
+		if (high != IWL_RATE_INVALID) {
+			update_lq = 1;
+			index = high;
+		}
+
+		break;
+	case 0:
+	default:
+		break;
+	}
+
+	IWL_DEBUG_HT("choose rate scale index %d action %d low %d "
+		    "high %d type %d\n",
+		     index, scale_action, low, high, tbl->lq_type);
+
+ lq_update:
+	if (update_lq) {
+		rs_mcs_from_tbl(&mcs_rate, tbl, index, is_green);
+		rs_fill_link_cmd(lq_data, &mcs_rate, &lq_data->lq, sta);
+		rs_send_lq_cmd(priv, &lq_data->lq, CMD_ASYNC);
+	}
+	rs_stay_in_table(lq_data);
+
+	if (!update_lq && !done_search && !lq_data->stay_in_tbl) {
+		lq_data->last_tpt = current_tpt;
+
+		if (is_legacy(tbl->lq_type))
+			rs_move_legacy_other(priv, lq_data, index);
+		else if (is_siso(tbl->lq_type))
+			rs_move_siso_to_other(priv, lq_data, index);
+		else
+			rs_move_mimo_to_other(priv, lq_data, index);
+
+		if (lq_data->search_better_tbl) {
+			tbl = &(lq_data->lq_info[(1 - lq_data->active_tbl)]);
+			for (i = 0; i < IWL_RATE_COUNT; i++)
+				rs_rate_scale_clear_window(&(tbl->win[i]));
+
+			index = iwl_rate_index_from_plcp(
+					tbl->current_rate.rate_n_flags);
+
+			IWL_DEBUG_HT("Switch current  mcs: %X index: %d\n",
+				     tbl->current_rate.rate_n_flags, index);
+			rs_fill_link_cmd(lq_data, &tbl->current_rate,
+					 &(lq_data->lq), sta);
+			rs_send_lq_cmd(priv, &lq_data->lq, CMD_ASYNC);
+		}
+		tbl1 = &(lq_data->lq_info[lq_data->active_tbl]);
+
+		if (is_legacy(tbl1->lq_type) &&
+#ifdef CONFIG_IWLWIFI_HT
+		    !priv->current_assoc_ht.is_ht &&
+#endif
+		    (lq_data->action_counter >= 1)) {
+			lq_data->action_counter = 0;
+			IWL_DEBUG_HT("LQ: STAY in legacy table\n");
+			rs_set_stay_in_table(1, lq_data);
+		}
+
+		if (lq_data->enable_counter &&
+		    (lq_data->action_counter >= IWL_ACTION_LIMIT)) {
+#ifdef CONFIG_IWLWIFI_HT_AGG
+			if ((lq_data->last_tpt > TID_AGG_TPT_THREHOLD) &&
+			    (priv->lq_mngr.agg_ctrl.auto_agg)) {
+				priv->lq_mngr.agg_ctrl.tid_retry =
+				    TID_ALL_SPECIFIED;
+				schedule_work(&priv->agg_work);
+			}
+#endif /*CONFIG_IWLWIFI_HT_AGG */
+			lq_data->action_counter = 0;
+			rs_set_stay_in_table(0, lq_data);
+		}
+	} else {
+		if ((!update_lq) && (!done_search) && (!lq_data->flush_timer))
+			lq_data->flush_timer = jiffies;
+	}
+
+out:
+	rs_mcs_from_tbl(&tbl->current_rate, tbl, index, is_green);
+	i = index;
+	sta->last_txrate = i;
+
+	/* sta->txrate is an index to A mode rates which start
+	 * at IWL_FIRST_OFDM_RATE
+	 */
+	if (lq_data->phymode == (u8) MODE_IEEE80211A)
+		sta->txrate = i - IWL_FIRST_OFDM_RATE;
+	else
+		sta->txrate = i;
+
+	return;
+}
+
+
+static void rs_initialize_lq(struct iwl_priv *priv,
+			     struct sta_info *sta)
+{
+	int i;
+	struct iwl_rate_scale_priv *lq;
+	struct iwl_scale_tbl_info *tbl;
+	u8 active_tbl = 0;
+	int rate_idx;
+	u8 use_green = rs_use_green(priv);
+	struct iwl_rate mcs_rate;
+
+	if (!sta || !sta->rate_ctrl_priv)
+		goto out;
+
+	lq = (struct iwl_rate_scale_priv *)sta->rate_ctrl_priv;
+	i = sta->last_txrate;
+
+	if ((lq->lq.sta_id == 0xff) &&
+	    (priv->iw_mode == IEEE80211_IF_TYPE_IBSS))
+		goto out;
+
+	if (!lq->search_better_tbl)
+		active_tbl = lq->active_tbl;
+	else
+		active_tbl = 1 - lq->active_tbl;
+
+	tbl = &(lq->lq_info[active_tbl]);
+
+	if ((i < 0) || (i >= IWL_RATE_COUNT))
+		i = 0;
+
+	mcs_rate.rate_n_flags = iwl_rates[i].plcp ;
+	mcs_rate.rate_n_flags |= RATE_MCS_ANT_B_MSK;
+	mcs_rate.rate_n_flags &= ~RATE_MCS_ANT_A_MSK;
+
+	if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
+		mcs_rate.rate_n_flags |= RATE_MCS_CCK_MSK;
+
+	tbl->antenna_type = ANT_AUX;
+	rs_get_tbl_info_from_mcs(&mcs_rate, priv->phymode, tbl, &rate_idx);
+	if (!rs_is_ant_connected(priv->valid_antenna, tbl->antenna_type))
+	    rs_toggle_antenna(&mcs_rate, tbl),
+
+	rs_mcs_from_tbl(&mcs_rate, tbl, rate_idx, use_green);
+	tbl->current_rate.rate_n_flags = mcs_rate.rate_n_flags;
+	rs_get_expected_tpt_table(lq, tbl);
+	rs_fill_link_cmd(lq, &mcs_rate, &(lq->lq), sta);
+	rs_send_lq_cmd(priv, &lq->lq, CMD_ASYNC);
+ out:
+	return;
+}
+
+static struct ieee80211_rate *rs_get_lowest_rate(struct ieee80211_local
+						 *local)
+{
+	struct ieee80211_hw_mode *mode = local->oper_hw_mode;
+	int i;
+
+	for (i = 0; i < mode->num_rates; i++) {
+		struct ieee80211_rate *rate = &mode->rates[i];
+
+		if (rate->flags & IEEE80211_RATE_SUPPORTED)
+			return rate;
+	}
+
+	return &mode->rates[0];
+}
+
+static struct ieee80211_rate *rs_get_rate(void *priv_rate,
+					       struct net_device *dev,
+					       struct sk_buff *skb,
+					       struct rate_control_extra
+					       *extra)
+{
+
+	int i;
+	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
+	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
+	struct sta_info *sta;
+	u16 fc;
+	struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
+	struct iwl_rate_scale_priv *lq;
+
+	IWL_DEBUG_RATE("rate scale calculate new rate for skb\n");
+
+	memset(extra, 0, sizeof(*extra));
+
+	fc = le16_to_cpu(hdr->frame_control);
+	if (!ieee80211_is_data(fc) || is_multicast_ether_addr(hdr->addr1)) {
+		/* Send management frames and broadcast/multicast data using
+		 * lowest rate. */
+		/* TODO: this could probably be improved.. */
+		return rs_get_lowest_rate(local);
+	}
+
+	sta = sta_info_get(local, hdr->addr1);
+
+	if (!sta || !sta->rate_ctrl_priv) {
+		if (sta)
+			sta_info_put(sta);
+		return rs_get_lowest_rate(local);
+	}
+
+	lq = (struct iwl_rate_scale_priv *)sta->rate_ctrl_priv;
+	i = sta->last_txrate;
+
+	if ((priv->iw_mode == IEEE80211_IF_TYPE_IBSS) && !lq->ibss_sta_added) {
+		u8 sta_id = iwl_hw_find_station(priv, hdr->addr1);
+
+		if (sta_id == IWL_INVALID_STATION) {
+			IWL_DEBUG_RATE("LQ: ADD station " MAC_FMT "\n",
+					MAC_ARG(hdr->addr1));
+			sta_id = iwl_add_station(priv,
+						 hdr->addr1, 0, CMD_ASYNC);
+		}
+		if ((sta_id != IWL_INVALID_STATION)) {
+			lq->lq.sta_id = sta_id;
+			lq->lq.rs_table[0].rate_n_flags = 0;
+			lq->ibss_sta_added = 1;
+			rs_initialize_lq(priv, sta);
+		}
+		if (!lq->ibss_sta_added)
+			goto done;
+	}
+
+ done:
+	sta_info_put(sta);
+	if ((i < 0) || (i > IWL_RATE_COUNT))
+		return rs_get_lowest_rate(local);
+
+	return &priv->ieee_rates[i];
+}
+
+static void *rs_alloc_sta(void *priv, gfp_t gfp)
+{
+	struct iwl_rate_scale_priv *crl;
+	int i, j;
+
+	IWL_DEBUG_RATE("create station rate scale window\n");
+
+	crl = kzalloc(sizeof(struct iwl_rate_scale_priv), gfp);
+
+	if (crl == NULL)
+		return NULL;
+
+	memset(crl, 0, sizeof(struct iwl_rate_scale_priv));
+	crl->lq.sta_id = 0xff;
+
+	for (j = 0; j < LQ_SIZE; j++)
+		for (i = 0; i < IWL_RATE_COUNT; i++)
+			rs_rate_scale_clear_window(&(crl->lq_info[j].win[i]));
+
+	return crl;
+}
+
+static void rs_rate_init(void *priv_rate, void *priv_sta,
+			 struct ieee80211_local *local,
+			 struct sta_info *sta)
+{
+	int i, j;
+	struct ieee80211_hw_mode *mode = local->oper_hw_mode;
+	struct iwl_priv *priv = (struct iwl_priv *)priv_rate;
+	struct iwl_rate_scale_priv *crl = priv_sta;
+
+	memset(crl, 0, sizeof(struct iwl_rate_scale_priv));
+
+	crl->lq.sta_id = 0xff;
+	crl->flush_timer = 0;
+	sta->txrate = 3;
+	for (j = 0; j < LQ_SIZE; j++)
+		for (i = 0; i < IWL_RATE_COUNT; i++)
+			rs_rate_scale_clear_window(&(crl->lq_info[j].win[i]));
+
+	IWL_DEBUG_RATE("rate scale global init\n");
+	/* TODO: what is a good starting rate for STA? About middle? Maybe not
+	 * the lowest or the highest rate.. Could consider using RSSI from
+	 * previous packets? Need to have IEEE 802.1X auth succeed immediately
+	 * after assoc.. */
+
+	crl->ibss_sta_added = 0;
+	if (priv->iw_mode == IEEE80211_IF_TYPE_AP) {
+		u8 sta_id = iwl_hw_find_station(priv, sta->addr);
+		/* for IBSS the call are from tasklet */
+		IWL_DEBUG_HT("LQ: ADD station " MAC_FMT " \n",
+			     MAC_ARG(sta->addr));
+
+		if (sta_id == IWL_INVALID_STATION) {
+			IWL_DEBUG_RATE("LQ: ADD station " MAC_FMT "\n",
+					MAC_ARG(sta->addr));
+					sta_id = iwl_add_station(priv,
+						 sta->addr, 0, CMD_ASYNC);
+		}
+		if ((sta_id != IWL_INVALID_STATION)) {
+			crl->lq.sta_id = sta_id;
+			crl->lq.rs_table[0].rate_n_flags = 0;
+		}
+		/* FIXME: this is w/a remove it later */
+		priv->assoc_station_added = 1;
+	}
+
+	for (i = 0; i < mode->num_rates; i++) {
+		if ((sta->supp_rates & BIT(i)) &&
+		    (mode->rates[i].flags & IEEE80211_RATE_SUPPORTED))
+			sta->txrate = i;
+	}
+	sta->last_txrate = sta->txrate;
+	/* For MODE_IEEE80211A mode cck rate are at end
+	 * rate table
+	 */
+	if (local->hw.conf.phymode == MODE_IEEE80211A)
+		sta->last_txrate += IWL_FIRST_OFDM_RATE;
+
+	crl->is_dup = priv->is_dup;
+	crl->valid_antenna = priv->valid_antenna;
+	crl->antenna = priv->antenna;
+	crl->is_green = rs_use_green(priv);
+	crl->active_rate = priv->active_rate;
+	crl->active_rate &= ~(0x1000);
+	crl->active_rate_basic = priv->active_rate_basic;
+	crl->phymode = priv->phymode;
+#ifdef CONFIG_IWLWIFI_HT
+	crl->active_siso_rate = (priv->current_assoc_ht.supp_rates[0] << 1);
+	crl->active_siso_rate |= (priv->current_assoc_ht.supp_rates[0] & 0x1);
+	crl->active_siso_rate &= ~((u16)0x2);
+	crl->active_siso_rate = crl->active_siso_rate << IWL_FIRST_OFDM_RATE;
+
+	crl->active_mimo_rate = (priv->current_assoc_ht.supp_rates[1] << 1);
+	crl->active_mimo_rate |= (priv->current_assoc_ht.supp_rates[1] & 0x1);
+	crl->active_mimo_rate &= ~((u16)0x2);
+	crl->active_mimo_rate = crl->active_mimo_rate << IWL_FIRST_OFDM_RATE;
+	IWL_DEBUG_HT("MIMO RATE 0x%X SISO MASK 0x%X\n", crl->active_siso_rate,
+		     crl->active_mimo_rate);
+#endif /*CONFIG_IWLWIFI_HT*/
+
+	if (priv->assoc_station_added)
+		priv->lq_mngr.lq_ready = 1;
+
+	rs_initialize_lq(priv, sta);
+}
+
+static int rs_fill_link_cmd(struct iwl_rate_scale_priv *lq_data,
+			    struct iwl_rate *tx_mcs,
+			    struct iwl_link_quality_cmd *lq_cmd,
+			    struct sta_info *sta)
+{
+	int index = 0;
+	int rc = 0;
+	int rate_idx;
+	u8 ant_toggle_count = 0;
+	u8 use_ht_possible = 1;
+	u8 repeat_cur_rate = 0;
+	struct iwl_rate new_rate;
+	struct iwl_scale_tbl_info tbl_type = { 0 };
+
+	rs_get_tbl_info_from_mcs(tx_mcs, lq_data->phymode,
+				  &tbl_type, &rate_idx);
+
+	if (is_legacy(tbl_type.lq_type)) {
+		ant_toggle_count = 1;
+		repeat_cur_rate = IWL_NUMBER_TRY;
+	} else
+		repeat_cur_rate = IWL_HT_NUMBER_TRY;
+
+	lq_cmd->general_params.mimo_delimiter =
+			is_mimo(tbl_type.lq_type) ? 1 : 0;
+	lq_cmd->rs_table[index].rate_n_flags =
+			cpu_to_le32(tx_mcs->rate_n_flags);
+	new_rate.rate_n_flags = tx_mcs->rate_n_flags;
+
+	if (is_mimo(tbl_type.lq_type) || (tbl_type.antenna_type == ANT_MAIN))
+		lq_cmd->general_params.single_stream_ant_msk = 1;
+	else
+		lq_cmd->general_params.single_stream_ant_msk = 2;
+
+	index++;
+	repeat_cur_rate--;
+
+	while (index < LINK_QUAL_MAX_RETRY_NUM) {
+		while (repeat_cur_rate && (index < LINK_QUAL_MAX_RETRY_NUM)) {
+			if (is_legacy(tbl_type.lq_type)) {
+				if (ant_toggle_count <
+				    NUM_TRY_BEFORE_ANTENNA_TOGGLE)
+					ant_toggle_count++;
+				else {
+					rs_toggle_antenna(&new_rate, &tbl_type);
+					ant_toggle_count = 1;
+				}
+			}
+			lq_cmd->rs_table[index].rate_n_flags =
+					cpu_to_le32(new_rate.rate_n_flags);
+			repeat_cur_rate--;
+			index++;
+		}
+
+		rs_get_tbl_info_from_mcs(&new_rate, lq_data->phymode, &tbl_type,
+						&rate_idx);
+
+		if (is_mimo(tbl_type.lq_type))
+			lq_cmd->general_params.mimo_delimiter = index;
+
+		rs_get_lower_rate(lq_data, &tbl_type, rate_idx,
+				  use_ht_possible, &new_rate, sta);
+
+		if (is_legacy(tbl_type.lq_type)) {
+			if (ant_toggle_count < NUM_TRY_BEFORE_ANTENNA_TOGGLE)
+				ant_toggle_count++;
+			else {
+				rs_toggle_antenna(&new_rate, &tbl_type);
+				ant_toggle_count = 1;
+			}
+			repeat_cur_rate = IWL_NUMBER_TRY;
+		} else
+			repeat_cur_rate = IWL_HT_NUMBER_TRY;
+
+		use_ht_possible = 0;
+
+		lq_cmd->rs_table[index].rate_n_flags =
+				cpu_to_le32(new_rate.rate_n_flags);
+		/* lq_cmd->rs_table[index].rate_n_flags = 0x800d; */
+
+		index++;
+		repeat_cur_rate--;
+	}
+
+	/* lq_cmd->rs_table[0].rate_n_flags = 0x800d; */
+
+	lq_cmd->general_params.dual_stream_ant_msk = 3;
+	lq_cmd->agg_params.agg_dis_start_th = 3;
+	lq_cmd->agg_params.agg_time_limit = cpu_to_le16(4000);
+	return rc;
+}
+
+static void *rs_alloc(struct ieee80211_local *local)
+{
+	return local->hw.priv;
+}
+/* rate scale requires free function to be implemented */
+static void rs_free(void *priv_rate)
+{
+	return;
+}
+
+static void rs_clear(void *priv_rate)
+{
+	struct iwl_priv *priv = (struct iwl_priv *) priv_rate;
+
+	IWL_DEBUG_RATE("enter\n");
+
+	priv->lq_mngr.lq_ready = 0;
+#ifdef CONFIG_IWLWIFI_HT
+#ifdef CONFIG_IWLWIFI_HT_AGG
+	if (priv->lq_mngr.agg_ctrl.granted_ba)
+		iwl4965_turn_off_agg(priv, TID_ALL_SPECIFIED);
+#endif /*CONFIG_IWLWIFI_HT_AGG */
+#endif /* CONFIG_IWLWIFI_HT */
+
+	IWL_DEBUG_RATE("leave\n");
+}
+
+static void rs_free_sta(void *priv, void *priv_sta)
+{
+	struct iwl_rate_scale_priv *rs_priv = priv_sta;
+
+	IWL_DEBUG_RATE("enter\n");
+	kfree(rs_priv);
+	IWL_DEBUG_RATE("leave\n");
+}
+
+
+static struct rate_control_ops rs_ops = {
+	.module = NULL,
+	.name = RS_NAME,
+	.tx_status = rs_tx_status,
+	.get_rate = rs_get_rate,
+	.rate_init = rs_rate_init,
+	.clear = rs_clear,
+	.alloc = rs_alloc,
+	.free = rs_free,
+	.alloc_sta = rs_alloc_sta,
+	.free_sta = rs_free_sta,
+};
+
+int iwl_fill_rs_info(struct ieee80211_hw *hw, char *buf, u8 sta_id)
+{
+	struct ieee80211_local *local = hw_to_local(hw);
+	struct iwl_priv *priv = hw->priv;
+	struct iwl_rate_scale_priv *rs_priv;
+	struct sta_info *sta;
+	int count = 0, i;
+	u32 samples = 0, success = 0, good = 0;
+	unsigned long now = jiffies;
+	u32 max_time = 0;
+	u8 lq_type, antenna;
+
+	sta = sta_info_get(local, priv->stations[sta_id].sta.sta.addr);
+	if (!sta || !sta->rate_ctrl_priv) {
+		if (sta) {
+			sta_info_put(sta);
+			IWL_DEBUG_RATE("leave - no private rate data!\n");
+		} else
+			IWL_DEBUG_RATE("leave - no station!\n");
+		return sprintf(buf, "station %d not found\n", sta_id);
+	}
+
+	rs_priv = (void *)sta->rate_ctrl_priv;
+
+	lq_type = rs_priv->lq_info[rs_priv->active_tbl].lq_type;
+	antenna = rs_priv->lq_info[rs_priv->active_tbl].antenna_type;
+
+	if (is_legacy(lq_type))
+		i = IWL_RATE_54M_INDEX;
+	else
+		i = IWL_RATE_60M_INDEX;
+	while (1) {
+		u64 mask;
+		int j;
+		int active = rs_priv->active_tbl;
+
+		count +=
+		    sprintf(&buf[count], " %2dMbs: ", iwl_rates[i].ieee / 2);
+
+		mask = (1ULL << (IWL_RATE_MAX_WINDOW - 1));
+		for (j = 0; j < IWL_RATE_MAX_WINDOW; j++, mask >>= 1)
+			buf[count++] =
+				(rs_priv->lq_info[active].win[i].data & mask)
+				? '1' : '0';
+
+		samples += rs_priv->lq_info[active].win[i].counter;
+		good += rs_priv->lq_info[active].win[i].success_counter;
+		success += rs_priv->lq_info[active].win[i].success_counter *
+			   iwl_rates[i].ieee;
+
+		if (rs_priv->lq_info[active].win[i].stamp) {
+			int delta =
+				   jiffies_to_msecs(now -
+				   rs_priv->lq_info[active].win[i].stamp);
+
+			if (delta > max_time)
+				max_time = delta;
+
+			count += sprintf(&buf[count], "%5dms\n", delta);
+		} else
+			buf[count++] = '\n';
+
+		j = iwl_get_prev_ieee_rate(i);
+		if (j == i)
+			break;
+		i = j;
+	}
+
+	/* Display the average rate of all samples taken.
+	 *
+	 * NOTE:  We multiple # of samples by 2 since the IEEE measurement
+	 * added from iwl_rates is actually 2X the rate */
+	if (samples)
+		count += sprintf(&buf[count],
+			 "\nAverage rate is %3d.%02dMbs over last %4dms\n"
+			 "%3d%% success (%d good packets over %d tries)\n",
+			 success / (2 * samples), (success * 5 / samples) % 10,
+			 max_time, good * 100 / samples, good, samples);
+	else
+		count += sprintf(&buf[count], "\nAverage rate: 0Mbs\n");
+	count += sprintf(&buf[count], "\nrate scale type %d anntena %d "
+			 "active_search %d rate index %d\n", lq_type, antenna,
+			 rs_priv->search_better_tbl, sta->last_txrate);
+
+	sta_info_put(sta);
+	return count;
+}
+
+void iwl_rate_scale_init(struct ieee80211_hw *hw, s32 sta_id)
+{
+	struct iwl_priv *priv = hw->priv;
+
+	priv->lq_mngr.lq_ready = 1;
+}
+
+void iwl_rate_control_register(struct ieee80211_hw *hw)
+{
+	ieee80211_rate_control_register(&rs_ops);
+}
+
+void iwl_rate_control_unregister(struct ieee80211_hw *hw)
+{
+	ieee80211_rate_control_unregister(&rs_ops);
+}
+