Logo Search packages:      
Sourcecode: linux version File versions  Download package

iwl-4965-rs.c

/******************************************************************************
 *
 * 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>

#define IWL 4965

#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;
      u32 supp_rates;
      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];
#ifdef CONFIG_MAC80211_DEBUGFS
      struct dentry *rs_sta_dbgfs_scale_table_file;
      struct dentry *rs_sta_dbgfs_stats_table_file;
      struct iwl_rate dbg_fixed;
      struct iwl_priv *drv;
#endif
};

static void rs_rate_scale_perform(struct iwl_priv *priv,
                           struct net_device *dev,
                           struct ieee80211_hdr *hdr,
                           struct sta_info *sta);
static void rs_fill_link_cmd(struct iwl_rate_scale_priv *lq_data,
                       struct iwl_rate *tx_mcs,
                       struct iwl_link_quality_cmd *tbl);


#ifdef CONFIG_MAC80211_DEBUGFS
static void rs_dbgfs_set_mcs(struct iwl_rate_scale_priv *rs_priv,
                        struct iwl_rate *mcs, int index);
#else
static void rs_dbgfs_set_mcs(struct iwl_rate_scale_priv *rs_priv,
                        struct iwl_rate *mcs, int index)
{}
#endif
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)
{
      s32 low;
      u16 rate_mask;
      u16 high_low;
      u8 switch_to_legacy = 0;
      u8 is_green = lq_data->is_green;

      /* 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 &
                     (lq_data->supp_rates << IWL_FIRST_OFDM_RATE));
            else
                  rate_mask = (u16)(rate_mask & lq_data->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_LIMIT("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 &
                        (lq_data->supp_rates << IWL_FIRST_OFDM_RATE));
            else
                  rate_scale_index_msk = (u16) (rate_mask &
                                          lq_data->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);
                  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);
            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);
                  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);
      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_LIMIT("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);
            DECLARE_MAC_BUF(mac);

            if (sta_id == IWL_INVALID_STATION) {
                  IWL_DEBUG_RATE("LQ: ADD station %s\n",
                               print_mac(mac, 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;
      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;

      crl->flush_timer = 0;
      crl->supp_rates = sta->supp_rates;
      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);
            DECLARE_MAC_BUF(mac);

            /* for IBSS the call are from tasklet */
            IWL_DEBUG_HT("LQ: ADD station %s\n",
                       print_mac(mac, sta->addr));

            if (sta_id == IWL_INVALID_STATION) {
                  IWL_DEBUG_RATE("LQ: ADD station %s\n",
                               print_mac(mac, 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*/
#ifdef CONFIG_MAC80211_DEBUGFS
      crl->drv = priv;
#endif

      if (priv->assoc_station_added)
            priv->lq_mngr.lq_ready = 1;

      rs_initialize_lq(priv, sta);
}

static void rs_fill_link_cmd(struct iwl_rate_scale_priv *lq_data,
                      struct iwl_rate *tx_mcs,
                      struct iwl_link_quality_cmd *lq_cmd)
{
      int index = 0;
      int rate_idx;
      int repeat_rate = 0;
      u8 ant_toggle_count = 0;
      u8 use_ht_possible = 1;
      struct iwl_rate new_rate;
      struct iwl_scale_tbl_info tbl_type = { 0 };

      rs_dbgfs_set_mcs(lq_data, tx_mcs, index);

      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_rate = IWL_NUMBER_TRY;
      } else
            repeat_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_rate--;

      while (index < LINK_QUAL_MAX_RETRY_NUM) {
            while (repeat_rate > 0 && (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;
                        }
                  }

                  rs_dbgfs_set_mcs(lq_data, &new_rate, index);
                  lq_cmd->rs_table[index].rate_n_flags =
                              cpu_to_le32(new_rate.rate_n_flags);
                  repeat_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);

            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_rate = IWL_NUMBER_TRY;
            } else
                  repeat_rate = IWL_HT_NUMBER_TRY;

            use_ht_possible = 0;

            rs_dbgfs_set_mcs(lq_data, &new_rate, index);
            lq_cmd->rs_table[index].rate_n_flags =
                        cpu_to_le32(new_rate.rate_n_flags);

            index++;
            repeat_rate--;
      }

      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);
}

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");
}


#ifdef CONFIG_MAC80211_DEBUGFS
static int open_file_generic(struct inode *inode, struct file *file)
{
      file->private_data = inode->i_private;
      return 0;
}
static void rs_dbgfs_set_mcs(struct iwl_rate_scale_priv *rs_priv,
                        struct iwl_rate *mcs, int index)
{
      u32 base_rate;

      if (rs_priv->phymode == (u8) MODE_IEEE80211A)
            base_rate = 0x800D;
      else
            base_rate = 0x820A;

      if (rs_priv->dbg_fixed.rate_n_flags) {
            if (index < 12)
                  mcs->rate_n_flags = rs_priv->dbg_fixed.rate_n_flags;
            else
                  mcs->rate_n_flags = base_rate;
            IWL_DEBUG_RATE("Fixed rate ON\n");
            return;
      }

      IWL_DEBUG_RATE("Fixed rate OFF\n");
}

static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
                  const char __user *user_buf, size_t count, loff_t *ppos)
{
      struct iwl_rate_scale_priv *rs_priv = file->private_data;
      char buf[64];
      int buf_size;
      u32 parsed_rate;

      memset(buf, 0, sizeof(buf));
      buf_size = min(count, sizeof(buf) -  1);
      if (copy_from_user(buf, user_buf, buf_size))
            return -EFAULT;

      if (sscanf(buf, "%x", &parsed_rate) == 1)
            rs_priv->dbg_fixed.rate_n_flags = parsed_rate;
      else
            rs_priv->dbg_fixed.rate_n_flags = 0;

      rs_priv->active_rate = 0x0FFF;
      rs_priv->active_siso_rate = 0x1FD0;
      rs_priv->active_mimo_rate = 0x1FD0;

      IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",
            rs_priv->lq.sta_id, rs_priv->dbg_fixed.rate_n_flags);

      if (rs_priv->dbg_fixed.rate_n_flags) {
            rs_fill_link_cmd(rs_priv, &rs_priv->dbg_fixed, &rs_priv->lq);
            rs_send_lq_cmd(rs_priv->drv, &rs_priv->lq, CMD_ASYNC);
      }

      return count;
}

static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
                  char __user *user_buf, size_t count, loff_t *ppos)
{
      char buff[1024];
      int desc = 0;
      int i = 0;

      struct iwl_rate_scale_priv *rs_priv = file->private_data;

      desc += sprintf(buff+desc, "sta_id %d\n", rs_priv->lq.sta_id);
      desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
                  rs_priv->total_failed, rs_priv->total_success,
                  rs_priv->active_rate);
      desc += sprintf(buff+desc, "fixed rate 0x%X\n",
                  rs_priv->dbg_fixed.rate_n_flags);
      desc += sprintf(buff+desc, "general:"
            "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
            rs_priv->lq.general_params.flags,
            rs_priv->lq.general_params.mimo_delimiter,
            rs_priv->lq.general_params.single_stream_ant_msk,
            rs_priv->lq.general_params.dual_stream_ant_msk);

      desc += sprintf(buff+desc, "agg:"
                  "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
                  le16_to_cpu(rs_priv->lq.agg_params.agg_time_limit),
                  rs_priv->lq.agg_params.agg_dis_start_th,
                  rs_priv->lq.agg_params.agg_frame_cnt_limit);

      desc += sprintf(buff+desc,
                  "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
                  rs_priv->lq.general_params.start_rate_index[0],
                  rs_priv->lq.general_params.start_rate_index[1],
                  rs_priv->lq.general_params.start_rate_index[2],
                  rs_priv->lq.general_params.start_rate_index[3]);


      for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
            desc += sprintf(buff+desc, " rate[%d] 0x%X\n",
                  i, le32_to_cpu(rs_priv->lq.rs_table[i].rate_n_flags));

      return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
}

static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
      .write = rs_sta_dbgfs_scale_table_write,
      .read = rs_sta_dbgfs_scale_table_read,
      .open = open_file_generic,
};
static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
                  char __user *user_buf, size_t count, loff_t *ppos)
{
      char buff[1024];
      int desc = 0;
      int i, j;

      struct iwl_rate_scale_priv *rs_priv = file->private_data;
      for (i = 0; i < LQ_SIZE; i++) {
            desc += sprintf(buff+desc, "%s type=%d SGI=%d FAT=%d DUP=%d\n"
                        "rate=0x%X\n",
                        rs_priv->active_tbl == i?"*":"x",
                        rs_priv->lq_info[i].lq_type,
                        rs_priv->lq_info[i].is_SGI,
                        rs_priv->lq_info[i].is_fat,
                        rs_priv->lq_info[i].is_dup,
                        rs_priv->lq_info[i].current_rate.rate_n_flags);
            for (j = 0; j < IWL_RATE_COUNT; j++) {
                  desc += sprintf(buff+desc,
                              "counter=%d success=%d %%=%d\n",
                              rs_priv->lq_info[i].win[j].counter,
                              rs_priv->lq_info[i].win[j].success_counter,
                              rs_priv->lq_info[i].win[j].success_ratio);
            }
      }
      return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
}

static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
      .read = rs_sta_dbgfs_stats_table_read,
      .open = open_file_generic,
};

static void rs_add_debugfs(void *priv, void *priv_sta,
                              struct dentry *dir)
{
      struct iwl_rate_scale_priv *rs_priv = priv_sta;
      rs_priv->rs_sta_dbgfs_scale_table_file =
            debugfs_create_file("rate_scale_table", 0600, dir,
                        rs_priv, &rs_sta_dbgfs_scale_table_ops);
      rs_priv->rs_sta_dbgfs_stats_table_file =
            debugfs_create_file("rate_stats_table", 0600, dir,
                  rs_priv, &rs_sta_dbgfs_stats_table_ops);
}

static void rs_remove_debugfs(void *priv, void *priv_sta)
{
      struct iwl_rate_scale_priv *rs_priv = priv_sta;
      debugfs_remove(rs_priv->rs_sta_dbgfs_scale_table_file);
      debugfs_remove(rs_priv->rs_sta_dbgfs_stats_table_file);
}
#endif

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,
#ifdef CONFIG_MAC80211_DEBUGFS
      .add_sta_debugfs = rs_add_debugfs,
      .remove_sta_debugfs = rs_remove_debugfs,
#endif
};

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);
}


Generated by  Doxygen 1.6.0   Back to index