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	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // SPDX-License-Identifier: GPL-2.0-only
 /******************************************************************************
  *
  * Copyright(c) 2005 - 2011 Intel Corporation. All rights reserved.
  *
  * Contact Information:
  *  Intel Linux Wireless <ilw@linux.intel.com>
  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  *
  *****************************************************************************/
 #include <linux/kernel.h>
 #include <linux/skbuff.h>
 #include <linux/slab.h>
 #include <net/mac80211.h>
 
 #include <linux/netdevice.h>
 #include <linux/etherdevice.h>
 #include <linux/delay.h>
 
 #include <linux/workqueue.h>
 
 #include "common.h"
 #include "4965.h"
 
 #define IL4965_RS_NAME "iwl-4965-rs"
 
 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
 #define IL_NUMBER_TRY      1
 #define IL_HT_NUMBER_TRY   3
 
 #define RATE_MAX_WINDOW     62  /* # tx in history win */
 #define RATE_MIN_FAILURE_TH     6   /* min failures to calc tpt */
 #define RATE_MIN_SUCCESS_TH     8   /* min successes to calc tpt */
 
 /* max allowed rate miss before sync LQ cmd */
 #define IL_MISSED_RATE_MAX      15
 /* max time to accum history 2 seconds */
 #define RATE_SCALE_FLUSH_INTVL   (3*HZ)
 
 static u8 rs_ht_to_legacy[] = {
     RATE_6M_IDX, RATE_6M_IDX,
     RATE_6M_IDX, RATE_6M_IDX,
     RATE_6M_IDX,
     RATE_6M_IDX, RATE_9M_IDX,
     RATE_12M_IDX, RATE_18M_IDX,
     RATE_24M_IDX, RATE_36M_IDX,
     RATE_48M_IDX, RATE_54M_IDX
 };
 
 static const u8 ant_toggle_lookup[] = {
     /*ANT_NONE -> */ ANT_NONE,
     /*ANT_A    -> */ ANT_B,
     /*ANT_B    -> */ ANT_C,
     /*ANT_AB   -> */ ANT_BC,
     /*ANT_C    -> */ ANT_A,
     /*ANT_AC   -> */ ANT_AB,
     /*ANT_BC   -> */ ANT_AC,
     /*ANT_ABC  -> */ ANT_ABC,
 };
 
 #define IL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np)    \
     [RATE_##r##M_IDX] = { RATE_##r##M_PLCP,      \
                     RATE_SISO_##s##M_PLCP, \
                     RATE_MIMO2_##s##M_PLCP,\
                     RATE_##r##M_IEEE,      \
                     RATE_##ip##M_IDX,    \
                     RATE_##in##M_IDX,    \
                     RATE_##rp##M_IDX,    \
                     RATE_##rn##M_IDX,    \
                     RATE_##pp##M_IDX,    \
                     RATE_##np##M_IDX }
 
 /*
  * Parameter order:
  *   rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate
  *
  * If there isn't a valid next or previous rate then INV is used which
  * maps to RATE_INVALID
  *
  */
 const struct il_rate_info il_rates[RATE_COUNT] = {
     IL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2),   /*  1mbps */
     IL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5),     /*  2mbps */
     IL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11),   /*5.5mbps */
     IL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18), /* 11mbps */
     IL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11),     /*  6mbps */
     IL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11),    /*  9mbps */
     IL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18),   /* 12mbps */
     IL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24),   /* 18mbps */
     IL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36),   /* 24mbps */
     IL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48),   /* 36mbps */
     IL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54),   /* 48mbps */
     IL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */
     IL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */
 };
 
 static int
 il4965_hwrate_to_plcp_idx(u32 rate_n_flags)
 {
     int idx = 0;
 
     /* HT rate format */
     if (rate_n_flags & RATE_MCS_HT_MSK) {
         idx = (rate_n_flags & 0xff);
 
         if (idx >= RATE_MIMO2_6M_PLCP)
             idx = idx - RATE_MIMO2_6M_PLCP;
 
         idx += IL_FIRST_OFDM_RATE;
         /* skip 9M not supported in ht */
         if (idx >= RATE_9M_IDX)
             idx += 1;
         if (idx >= IL_FIRST_OFDM_RATE && idx <= IL_LAST_OFDM_RATE)
             return idx;
 
         /* legacy rate format, search for match in table */
     } else {
         for (idx = 0; idx < ARRAY_SIZE(il_rates); idx++)
             if (il_rates[idx].plcp == (rate_n_flags & 0xFF))
                 return idx;
     }
 
     return -1;
 }
 
 static void il4965_rs_rate_scale_perform(struct il_priv *il,
                      struct sk_buff *skb,
                      struct ieee80211_sta *sta,
                      struct il_lq_sta *lq_sta);
 static void il4965_rs_fill_link_cmd(struct il_priv *il,
                     struct il_lq_sta *lq_sta, u32 rate_n_flags);
 static void il4965_rs_stay_in_table(struct il_lq_sta *lq_sta,
                     bool force_search);
 
 #ifdef CONFIG_MAC80211_DEBUGFS
 static void il4965_rs_dbgfs_set_mcs(struct il_lq_sta *lq_sta,
                     u32 *rate_n_flags, int idx);
 #else
 static void
 il4965_rs_dbgfs_set_mcs(struct il_lq_sta *lq_sta, u32 * rate_n_flags, int idx)
 {
 }
 #endif
 
 /*
  * The following tables contain the expected throughput metrics for all rates
  *
  *  1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
  *
  * where invalid entries are zeros.
  *
  * CCK rates are only valid in legacy table and will only be used in G
  * (2.4 GHz) band.
  */
 
 static s32 expected_tpt_legacy[RATE_COUNT] = {
     7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
 };
 
 static s32 expected_tpt_siso20MHz[4][RATE_COUNT] = {
     {0, 0, 0, 0, 42, 0, 76, 102, 124, 158, 183, 193, 202},  /* Norm */
     {0, 0, 0, 0, 46, 0, 82, 110, 132, 167, 192, 202, 210},  /* SGI */
     {0, 0, 0, 0, 48, 0, 93, 135, 176, 251, 319, 351, 381},  /* AGG */
     {0, 0, 0, 0, 53, 0, 102, 149, 193, 275, 348, 381, 413}, /* AGG+SGI */
 };
 
 static s32 expected_tpt_siso40MHz[4][RATE_COUNT] = {
     {0, 0, 0, 0, 77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */
     {0, 0, 0, 0, 83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */
     {0, 0, 0, 0, 96, 0, 182, 259, 328, 451, 553, 598, 640}, /* AGG */
     {0, 0, 0, 0, 106, 0, 199, 282, 357, 487, 593, 640, 683},    /* AGG+SGI */
 };
 
 static s32 expected_tpt_mimo2_20MHz[4][RATE_COUNT] = {
     {0, 0, 0, 0, 74, 0, 123, 155, 179, 213, 235, 243, 250}, /* Norm */
     {0, 0, 0, 0, 81, 0, 131, 164, 187, 221, 242, 250, 256}, /* SGI */
     {0, 0, 0, 0, 92, 0, 175, 250, 317, 436, 534, 578, 619}, /* AGG */
     {0, 0, 0, 0, 102, 0, 192, 273, 344, 470, 573, 619, 660},    /* AGG+SGI */
 };
 
 static s32 expected_tpt_mimo2_40MHz[4][RATE_COUNT] = {
     {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289},    /* Norm */
     {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293},    /* SGI */
     {0, 0, 0, 0, 180, 0, 327, 446, 545, 708, 828, 878, 922},    /* AGG */
     {0, 0, 0, 0, 197, 0, 355, 481, 584, 752, 872, 922, 966},    /* AGG+SGI */
 };
 
 /* mbps, mcs */
 static const struct il_rate_mcs_info il_rate_mcs[RATE_COUNT] = {
     {"1", "BPSK DSSS"},
     {"2", "QPSK DSSS"},
     {"5.5", "BPSK CCK"},
     {"11", "QPSK CCK"},
     {"6", "BPSK 1/2"},
     {"9", "BPSK 1/2"},
     {"12", "QPSK 1/2"},
     {"18", "QPSK 3/4"},
     {"24", "16QAM 1/2"},
     {"36", "16QAM 3/4"},
     {"48", "64QAM 2/3"},
     {"54", "64QAM 3/4"},
     {"60", "64QAM 5/6"},
 };
 
 #define MCS_IDX_PER_STREAM  (8)
 
 static inline u8
 il4965_rs_extract_rate(u32 rate_n_flags)
 {
     return (u8) (rate_n_flags & 0xFF);
 }
 
 static void
 il4965_rs_rate_scale_clear_win(struct il_rate_scale_data *win)
 {
     win->data = 0;
     win->success_counter = 0;
     win->success_ratio = IL_INVALID_VALUE;
     win->counter = 0;
     win->average_tpt = IL_INVALID_VALUE;
     win->stamp = 0;
 }
 
 static inline u8
 il4965_rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 {
     return (ant_type & valid_antenna) == ant_type;
 }
 
 /*
  *  removes the old data from the stats. All data that is older than
  *  TID_MAX_TIME_DIFF, will be deleted.
  */
 static void
 il4965_rs_tl_rm_old_stats(struct il_traffic_load *tl, u32 curr_time)
 {
     /* The oldest age we want to keep */
     u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
 
     while (tl->queue_count && tl->time_stamp < oldest_time) {
         tl->total -= tl->packet_count[tl->head];
         tl->packet_count[tl->head] = 0;
         tl->time_stamp += TID_QUEUE_CELL_SPACING;
         tl->queue_count--;
         tl->head++;
         if (tl->head >= TID_QUEUE_MAX_SIZE)
             tl->head = 0;
     }
 }
 
 /*
  *  increment traffic load value for tid and also remove
  *  any old values if passed the certain time period
  */
 static u8
 il4965_rs_tl_add_packet(struct il_lq_sta *lq_data, struct ieee80211_hdr *hdr)
 {
     u32 curr_time = jiffies_to_msecs(jiffies);
     u32 time_diff;
     s32 idx;
     struct il_traffic_load *tl = NULL;
     u8 tid;
 
     if (ieee80211_is_data_qos(hdr->frame_control)) {
         u8 *qc = ieee80211_get_qos_ctl(hdr);
         tid = qc[0] & 0xf;
     } else
         return MAX_TID_COUNT;
 
     if (unlikely(tid >= TID_MAX_LOAD_COUNT))
         return MAX_TID_COUNT;
 
     tl = &lq_data->load[tid];
 
     curr_time -= curr_time % TID_ROUND_VALUE;
 
     /* Happens only for the first packet. Initialize the data */
     if (!(tl->queue_count)) {
         tl->total = 1;
         tl->time_stamp = curr_time;
         tl->queue_count = 1;
         tl->head = 0;
         tl->packet_count[0] = 1;
         return MAX_TID_COUNT;
     }
 
     time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
     idx = time_diff / TID_QUEUE_CELL_SPACING;
 
     /* The history is too long: remove data that is older than */
     /* TID_MAX_TIME_DIFF */
     if (idx >= TID_QUEUE_MAX_SIZE)
         il4965_rs_tl_rm_old_stats(tl, curr_time);
 
     idx = (tl->head + idx) % TID_QUEUE_MAX_SIZE;
     tl->packet_count[idx] = tl->packet_count[idx] + 1;
     tl->total = tl->total + 1;
 
     if ((idx + 1) > tl->queue_count)
         tl->queue_count = idx + 1;
 
     return tid;
 }
 
 /*
     get the traffic load value for tid
 */
 static u32
 il4965_rs_tl_get_load(struct il_lq_sta *lq_data, u8 tid)
 {
     u32 curr_time = jiffies_to_msecs(jiffies);
     u32 time_diff;
     s32 idx;
     struct il_traffic_load *tl = NULL;
 
     if (tid >= TID_MAX_LOAD_COUNT)
         return 0;
 
     tl = &(lq_data->load[tid]);
 
     curr_time -= curr_time % TID_ROUND_VALUE;
 
     if (!(tl->queue_count))
         return 0;
 
     time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
     idx = time_diff / TID_QUEUE_CELL_SPACING;
 
     /* The history is too long: remove data that is older than */
     /* TID_MAX_TIME_DIFF */
     if (idx >= TID_QUEUE_MAX_SIZE)
         il4965_rs_tl_rm_old_stats(tl, curr_time);
 
     return tl->total;
 }
 
 static int
 il4965_rs_tl_turn_on_agg_for_tid(struct il_priv *il, struct il_lq_sta *lq_data,
                  u8 tid, struct ieee80211_sta *sta)
 {
     int ret = -EAGAIN;
     u32 load;
 
     load = il4965_rs_tl_get_load(lq_data, tid);
 
     if (load > IL_AGG_LOAD_THRESHOLD) {
         D_HT("Starting Tx agg: STA: %pM tid: %d\n", sta->addr, tid);
         ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
         if (ret == -EAGAIN) {
             /*
              * driver and mac80211 is out of sync
              * this might be cause by reloading firmware
              * stop the tx ba session here
              */
             IL_ERR("Fail start Tx agg on tid: %d\n", tid);
             ieee80211_stop_tx_ba_session(sta, tid);
         }
     } else
         D_HT("Aggregation not enabled for tid %d because load = %u\n",
              tid, load);
 
     return ret;
 }
 
 static void
 il4965_rs_tl_turn_on_agg(struct il_priv *il, u8 tid, struct il_lq_sta *lq_data,
              struct ieee80211_sta *sta)
 {
     if (tid < TID_MAX_LOAD_COUNT)
         il4965_rs_tl_turn_on_agg_for_tid(il, lq_data, tid, sta);
     else
         IL_ERR("tid exceeds max load count: %d/%d\n", tid,
                TID_MAX_LOAD_COUNT);
 }
 
 static inline int
 il4965_get_il4965_num_of_ant_from_rate(u32 rate_n_flags)
 {
     return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
         !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
         !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
 }
 
 /*
  * Static function to get the expected throughput from an il_scale_tbl_info
  * that wraps a NULL pointer check
  */
 static s32
 il4965_get_expected_tpt(struct il_scale_tbl_info *tbl, int rs_idx)
 {
     if (tbl->expected_tpt)
         return tbl->expected_tpt[rs_idx];
     return 0;
 }
 
 /*
  * il4965_rs_collect_tx_data - Update the success/failure sliding win
  *
  * We keep a sliding win of the last 62 packets transmitted
  * at this rate.  win->data contains the bitmask of successful
  * packets.
  */
 static int
 il4965_rs_collect_tx_data(struct il_scale_tbl_info *tbl, int scale_idx,
               int attempts, int successes)
 {
     struct il_rate_scale_data *win = NULL;
     static const u64 mask = (((u64) 1) << (RATE_MAX_WINDOW - 1));
     s32 fail_count, tpt;
 
     if (scale_idx < 0 || scale_idx >= RATE_COUNT)
         return -EINVAL;
 
     /* Select win for current tx bit rate */
     win = &(tbl->win[scale_idx]);
 
     /* Get expected throughput */
     tpt = il4965_get_expected_tpt(tbl, scale_idx);
 
     /*
      * Keep track of only the latest 62 tx frame attempts in this rate's
      * history win; anything older isn't really relevant any more.
      * If we have filled up the sliding win, drop the oldest attempt;
      * if the oldest attempt (highest bit in bitmap) shows "success",
      * subtract "1" from the success counter (this is the main reason
      * we keep these bitmaps!).
      */
     while (attempts > 0) {
         if (win->counter >= RATE_MAX_WINDOW) {
 
             /* remove earliest */
             win->counter = RATE_MAX_WINDOW - 1;
 
             if (win->data & mask) {
                 win->data &= ~mask;
                 win->success_counter--;
             }
         }
 
         /* Increment frames-attempted counter */
         win->counter++;
 
         /* Shift bitmap by one frame to throw away oldest history */
         win->data <<= 1;
 
         /* Mark the most recent #successes attempts as successful */
         if (successes > 0) {
             win->success_counter++;
             win->data |= 0x1;
             successes--;
         }
 
         attempts--;
     }
 
     /* Calculate current success ratio, avoid divide-by-0! */
     if (win->counter > 0)
         win->success_ratio =
             128 * (100 * win->success_counter) / win->counter;
     else
         win->success_ratio = IL_INVALID_VALUE;
 
     fail_count = win->counter - win->success_counter;
 
     /* Calculate average throughput, if we have enough history. */
     if (fail_count >= RATE_MIN_FAILURE_TH ||
         win->success_counter >= RATE_MIN_SUCCESS_TH)
         win->average_tpt = (win->success_ratio * tpt + 64) / 128;
     else
         win->average_tpt = IL_INVALID_VALUE;
 
     /* Tag this win as having been updated */
     win->stamp = jiffies;
 
     return 0;
 }
 
 /*
  * Fill uCode API rate_n_flags field, based on "search" or "active" table.
  */
 static u32
 il4965_rate_n_flags_from_tbl(struct il_priv *il, struct il_scale_tbl_info *tbl,
                  int idx, u8 use_green)
 {
     u32 rate_n_flags = 0;
 
     if (is_legacy(tbl->lq_type)) {
         rate_n_flags = il_rates[idx].plcp;
         if (idx >= IL_FIRST_CCK_RATE && idx <= IL_LAST_CCK_RATE)
             rate_n_flags |= RATE_MCS_CCK_MSK;
 
     } else if (is_Ht(tbl->lq_type)) {
         if (idx > IL_LAST_OFDM_RATE) {
             IL_ERR("Invalid HT rate idx %d\n", idx);
             idx = IL_LAST_OFDM_RATE;
         }
         rate_n_flags = RATE_MCS_HT_MSK;
 
         if (is_siso(tbl->lq_type))
             rate_n_flags |= il_rates[idx].plcp_siso;
         else
             rate_n_flags |= il_rates[idx].plcp_mimo2;
     } else {
         IL_ERR("Invalid tbl->lq_type %d\n", tbl->lq_type);
     }
 
     rate_n_flags |=
         ((tbl->ant_type << RATE_MCS_ANT_POS) & RATE_MCS_ANT_ABC_MSK);
 
     if (is_Ht(tbl->lq_type)) {
         if (tbl->is_ht40) {
             if (tbl->is_dup)
                 rate_n_flags |= RATE_MCS_DUP_MSK;
             else
                 rate_n_flags |= RATE_MCS_HT40_MSK;
         }
         if (tbl->is_SGI)
             rate_n_flags |= RATE_MCS_SGI_MSK;
 
         if (use_green) {
             rate_n_flags |= RATE_MCS_GF_MSK;
             if (is_siso(tbl->lq_type) && tbl->is_SGI) {
                 rate_n_flags &= ~RATE_MCS_SGI_MSK;
                 IL_ERR("GF was set with SGI:SISO\n");
             }
         }
     }
     return rate_n_flags;
 }
 
 /*
  * Interpret uCode API's rate_n_flags format,
  * fill "search" or "active" tx mode table.
  */
 static int
 il4965_rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
                 enum nl80211_band band,
                 struct il_scale_tbl_info *tbl, int *rate_idx)
 {
     u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
     u8 il4965_num_of_ant =
         il4965_get_il4965_num_of_ant_from_rate(rate_n_flags);
     u8 mcs;
 
     memset(tbl, 0, sizeof(struct il_scale_tbl_info));
     *rate_idx = il4965_hwrate_to_plcp_idx(rate_n_flags);
 
     if (*rate_idx == RATE_INVALID) {
         *rate_idx = -1;
         return -EINVAL;
     }
     tbl->is_SGI = 0;    /* default legacy setup */
     tbl->is_ht40 = 0;
     tbl->is_dup = 0;
     tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
     tbl->lq_type = LQ_NONE;
     tbl->max_search = IL_MAX_SEARCH;
 
     /* legacy rate format */
     if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
         if (il4965_num_of_ant == 1) {
             if (band == NL80211_BAND_5GHZ)
                 tbl->lq_type = LQ_A;
             else
                 tbl->lq_type = LQ_G;
         }
         /* HT rate format */
     } else {
         if (rate_n_flags & RATE_MCS_SGI_MSK)
             tbl->is_SGI = 1;
 
         if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
             (rate_n_flags & RATE_MCS_DUP_MSK))
             tbl->is_ht40 = 1;
 
         if (rate_n_flags & RATE_MCS_DUP_MSK)
             tbl->is_dup = 1;
 
         mcs = il4965_rs_extract_rate(rate_n_flags);
 
         /* SISO */
         if (mcs <= RATE_SISO_60M_PLCP) {
             if (il4965_num_of_ant == 1)
                 tbl->lq_type = LQ_SISO; /*else NONE */
             /* MIMO2 */
         } else {
             if (il4965_num_of_ant == 2)
                 tbl->lq_type = LQ_MIMO2;
         }
     }
     return 0;
 }
 
 /* switch to another antenna/antennas and return 1 */
 /* if no other valid antenna found, return 0 */
 static int
 il4965_rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
              struct il_scale_tbl_info *tbl)
 {
     u8 new_ant_type;
 
     if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
         return 0;
 
     if (!il4965_rs_is_valid_ant(valid_ant, tbl->ant_type))
         return 0;
 
     new_ant_type = ant_toggle_lookup[tbl->ant_type];
 
     while (new_ant_type != tbl->ant_type &&
            !il4965_rs_is_valid_ant(valid_ant, new_ant_type))
         new_ant_type = ant_toggle_lookup[new_ant_type];
 
     if (new_ant_type == tbl->ant_type)
         return 0;
 
     tbl->ant_type = new_ant_type;
     *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
     *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
     return 1;
 }
 
 /*
  * Green-field mode is valid if the station supports it and
  * there are no non-GF stations present in the BSS.
  */
 static bool
 il4965_rs_use_green(struct il_priv *il, struct ieee80211_sta *sta)
 {
     return (sta->deflink.ht_cap.cap & IEEE80211_HT_CAP_GRN_FLD) &&
            !il->ht.non_gf_sta_present;
 }
 
 /*
  * il4965_rs_get_supported_rates - get the available rates
  *
  * if management frame or broadcast frame only return
  * basic available rates.
  *
  */
 static u16
 il4965_rs_get_supported_rates(struct il_lq_sta *lq_sta,
                   struct ieee80211_hdr *hdr,
                   enum il_table_type rate_type)
 {
     if (is_legacy(rate_type)) {
         return lq_sta->active_legacy_rate;
     } else {
         if (is_siso(rate_type))
             return lq_sta->active_siso_rate;
         else
             return lq_sta->active_mimo2_rate;
     }
 }
 
 static u16
 il4965_rs_get_adjacent_rate(struct il_priv *il, u8 idx, u16 rate_mask,
                 int rate_type)
 {
     u8 high = RATE_INVALID;
     u8 low = RATE_INVALID;
 
     /* 802.11A or ht walks to the next literal adjacent 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 = idx - 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 = idx + 1;
         for (mask = (1 << i); i < RATE_COUNT; i++, mask <<= 1) {
             if (rate_mask & mask) {
                 high = i;
                 break;
             }
         }
 
         return (high << 8) | low;
     }
 
     low = idx;
     while (low != RATE_INVALID) {
         low = il_rates[low].prev_rs;
         if (low == RATE_INVALID)
             break;
         if (rate_mask & (1 << low))
             break;
         D_RATE("Skipping masked lower rate: %d\n", low);
     }
 
     high = idx;
     while (high != RATE_INVALID) {
         high = il_rates[high].next_rs;
         if (high == RATE_INVALID)
             break;
         if (rate_mask & (1 << high))
             break;
         D_RATE("Skipping masked higher rate: %d\n", high);
     }
 
     return (high << 8) | low;
 }
 
 static u32
 il4965_rs_get_lower_rate(struct il_lq_sta *lq_sta,
              struct il_scale_tbl_info *tbl, u8 scale_idx,
              u8 ht_possible)
 {
     s32 low;
     u16 rate_mask;
     u16 high_low;
     u8 switch_to_legacy = 0;
     u8 is_green = lq_sta->is_green;
     struct il_priv *il = lq_sta->drv;
 
     /* 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_idx)) {
         switch_to_legacy = 1;
         scale_idx = rs_ht_to_legacy[scale_idx];
         if (lq_sta->band == NL80211_BAND_5GHZ)
             tbl->lq_type = LQ_A;
         else
             tbl->lq_type = LQ_G;
 
         if (il4965_num_of_ant(tbl->ant_type) > 1)
             tbl->ant_type =
                 il4965_first_antenna(il->hw_params.valid_tx_ant);
 
         tbl->is_ht40 = 0;
         tbl->is_SGI = 0;
         tbl->max_search = IL_MAX_SEARCH;
     }
 
     rate_mask = il4965_rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
 
     /* Mask with station rate restriction */
     if (is_legacy(tbl->lq_type)) {
         /* supp_rates has no CCK bits in A mode */
         if (lq_sta->band == NL80211_BAND_5GHZ)
             rate_mask =
                 (u16) (rate_mask &
                    (lq_sta->supp_rates << IL_FIRST_OFDM_RATE));
         else
             rate_mask = (u16) (rate_mask & lq_sta->supp_rates);
     }
 
     /* If we switched from HT to legacy, check current rate */
     if (switch_to_legacy && (rate_mask & (1 << scale_idx))) {
         low = scale_idx;
         goto out;
     }
 
     high_low =
         il4965_rs_get_adjacent_rate(lq_sta->drv, scale_idx, rate_mask,
                     tbl->lq_type);
     low = high_low & 0xff;
 
     if (low == RATE_INVALID)
         low = scale_idx;
 
 out:
     return il4965_rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
 }
 
 /*
  * Simple function to compare two rate scale table types
  */
 static bool
 il4965_table_type_matches(struct il_scale_tbl_info *a,
               struct il_scale_tbl_info *b)
 {
     return (a->lq_type == b->lq_type && a->ant_type == b->ant_type &&
         a->is_SGI == b->is_SGI);
 }
 
 /*
  * mac80211 sends us Tx status
  */
 static void
 il4965_rs_tx_status(void *il_r, struct ieee80211_supported_band *sband,
             struct ieee80211_sta *sta, void *il_sta,
             struct sk_buff *skb)
 {
     int legacy_success;
     int retries;
     int rs_idx, mac_idx, i;
     struct il_lq_sta *lq_sta = il_sta;
     struct il_link_quality_cmd *table;
     struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
     struct il_priv *il = (struct il_priv *)il_r;
     struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
     enum mac80211_rate_control_flags mac_flags;
     u32 tx_rate;
     struct il_scale_tbl_info tbl_type;
     struct il_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
 
     D_RATE("get frame ack response, update rate scale win\n");
 
     /* Treat uninitialized rate scaling data same as non-existing. */
     if (!lq_sta) {
         D_RATE("Station rate scaling not created yet.\n");
         return;
     } else if (!lq_sta->drv) {
         D_RATE("Rate scaling not initialized yet.\n");
         return;
     }
 
     if (!ieee80211_is_data(hdr->frame_control) ||
         (info->flags & IEEE80211_TX_CTL_NO_ACK))
         return;
 
     /* This packet was aggregated but doesn't carry status info */
     if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
         !(info->flags & IEEE80211_TX_STAT_AMPDU))
         return;
 
     /*
      * Ignore this Tx frame response if its initial rate doesn't match
      * that of latest Link Quality command.  There may be stragglers
      * from a previous Link Quality command, but we're no longer interested
      * in those; they're either from the "active" mode while we're trying
      * to check "search" mode, or a prior "search" mode after we've moved
      * to a new "search" mode (which might become the new "active" mode).
      */
     table = &lq_sta->lq;
     tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
     il4965_rs_get_tbl_info_from_mcs(tx_rate, il->band, &tbl_type, &rs_idx);
     if (il->band == NL80211_BAND_5GHZ)
         rs_idx -= IL_FIRST_OFDM_RATE;
     mac_flags = info->status.rates[0].flags;
     mac_idx = info->status.rates[0].idx;
     /* For HT packets, map MCS to PLCP */
     if (mac_flags & IEEE80211_TX_RC_MCS) {
         mac_idx &= RATE_MCS_CODE_MSK;   /* Remove # of streams */
         if (mac_idx >= (RATE_9M_IDX - IL_FIRST_OFDM_RATE))
             mac_idx++;
         /*
          * mac80211 HT idx is always zero-idxed; we need to move
          * HT OFDM rates after CCK rates in 2.4 GHz band
          */
         if (il->band == NL80211_BAND_2GHZ)
             mac_idx += IL_FIRST_OFDM_RATE;
     }
     /* Here we actually compare this rate to the latest LQ command */
     if (mac_idx < 0 ||
         tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI) ||
         tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH) ||
         tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA) ||
         tbl_type.ant_type != info->status.antenna ||
         !!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)
         || !!(tx_rate & RATE_MCS_GF_MSK) !=
         !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD) || rs_idx != mac_idx) {
         D_RATE("initial rate %d does not match %d (0x%x)\n", mac_idx,
                rs_idx, tx_rate);
         /*
          * Since rates mis-match, the last LQ command may have failed.
          * After IL_MISSED_RATE_MAX mis-matches, resync the uCode with
          * ... driver.
          */
         lq_sta->missed_rate_counter++;
         if (lq_sta->missed_rate_counter > IL_MISSED_RATE_MAX) {
             lq_sta->missed_rate_counter = 0;
             il_send_lq_cmd(il, &lq_sta->lq, CMD_ASYNC, false);
         }
         /* Regardless, ignore this status info for outdated rate */
         return;
     } else
         /* Rate did match, so reset the missed_rate_counter */
         lq_sta->missed_rate_counter = 0;
 
     /* Figure out if rate scale algorithm is in active or search table */
     if (il4965_table_type_matches
         (&tbl_type, &(lq_sta->lq_info[lq_sta->active_tbl]))) {
         curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
         other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
     } else
         if (il4965_table_type_matches
         (&tbl_type, &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
         curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
         other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
     } else {
         D_RATE("Neither active nor search matches tx rate\n");
         tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
         D_RATE("active- lq:%x, ant:%x, SGI:%d\n", tmp_tbl->lq_type,
                tmp_tbl->ant_type, tmp_tbl->is_SGI);
         tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
         D_RATE("search- lq:%x, ant:%x, SGI:%d\n", tmp_tbl->lq_type,
                tmp_tbl->ant_type, tmp_tbl->is_SGI);
         D_RATE("actual- lq:%x, ant:%x, SGI:%d\n", tbl_type.lq_type,
                tbl_type.ant_type, tbl_type.is_SGI);
         /*
          * no matching table found, let's by-pass the data collection
          * and continue to perform rate scale to find the rate table
          */
         il4965_rs_stay_in_table(lq_sta, true);
         goto done;
     }
 
     /*
      * Updating the frame history depends on whether packets were
      * aggregated.
      *
      * For aggregation, all packets were transmitted at the same rate, the
      * first idx into rate scale table.
      */
     if (info->flags & IEEE80211_TX_STAT_AMPDU) {
         tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
         il4965_rs_get_tbl_info_from_mcs(tx_rate, il->band, &tbl_type,
                         &rs_idx);
         il4965_rs_collect_tx_data(curr_tbl, rs_idx,
                       info->status.ampdu_len,
                       info->status.ampdu_ack_len);
 
         /* Update success/fail counts if not searching for new mode */
         if (lq_sta->stay_in_tbl) {
             lq_sta->total_success += info->status.ampdu_ack_len;
             lq_sta->total_failed +=
                 (info->status.ampdu_len -
                  info->status.ampdu_ack_len);
         }
     } else {
         /*
          * For legacy, update frame history with for each Tx retry.
          */
         retries = info->status.rates[0].count - 1;
         /* HW doesn't send more than 15 retries */
         retries = min(retries, 15);
 
         /* The last transmission may have been successful */
         legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
         /* Collect data for each rate used during failed TX attempts */
         for (i = 0; i <= retries; ++i) {
             tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags);
             il4965_rs_get_tbl_info_from_mcs(tx_rate, il->band,
                             &tbl_type, &rs_idx);
             /*
              * Only collect stats if retried rate is in the same RS
              * table as active/search.
              */
             if (il4965_table_type_matches(&tbl_type, curr_tbl))
                 tmp_tbl = curr_tbl;
             else if (il4965_table_type_matches
                  (&tbl_type, other_tbl))
                 tmp_tbl = other_tbl;
             else
                 continue;
             il4965_rs_collect_tx_data(tmp_tbl, rs_idx, 1,
                           i <
                           retries ? 0 : legacy_success);
         }
 
         /* Update success/fail counts if not searching for new mode */
         if (lq_sta->stay_in_tbl) {
             lq_sta->total_success += legacy_success;
             lq_sta->total_failed += retries + (1 - legacy_success);
         }
     }
     /* The last TX rate is cached in lq_sta; it's set in if/else above */
     lq_sta->last_rate_n_flags = tx_rate;
 done:
     /* See if there's a better rate or modulation mode to try. */
     if (sta->deflink.supp_rates[sband->band])
         il4965_rs_rate_scale_perform(il, skb, sta, lq_sta);
 }
 
 /*
  * Begin a period of staying with a selected modulation mode.
  * Set "stay_in_tbl" flag to prevent any mode switches.
  * Set frame tx success limits according to legacy vs. high-throughput,
  * and reset overall (spanning all rates) tx success history stats.
  * These control how long we stay using same modulation mode before
  * searching for a new mode.
  */
 static void
 il4965_rs_set_stay_in_table(struct il_priv *il, u8 is_legacy,
                 struct il_lq_sta *lq_sta)
 {
     D_RATE("we are staying in the same table\n");
     lq_sta->stay_in_tbl = 1;    /* only place this gets set */
     if (is_legacy) {
         lq_sta->table_count_limit = IL_LEGACY_TBL_COUNT;
         lq_sta->max_failure_limit = IL_LEGACY_FAILURE_LIMIT;
         lq_sta->max_success_limit = IL_LEGACY_SUCCESS_LIMIT;
     } else {
         lq_sta->table_count_limit = IL_NONE_LEGACY_TBL_COUNT;
         lq_sta->max_failure_limit = IL_NONE_LEGACY_FAILURE_LIMIT;
         lq_sta->max_success_limit = IL_NONE_LEGACY_SUCCESS_LIMIT;
     }
     lq_sta->table_count = 0;
     lq_sta->total_failed = 0;
     lq_sta->total_success = 0;
     lq_sta->flush_timer = jiffies;
     lq_sta->action_counter = 0;
 }
 
 /*
  * Find correct throughput table for given mode of modulation
  */
 static void
 il4965_rs_set_expected_tpt_table(struct il_lq_sta *lq_sta,
                  struct il_scale_tbl_info *tbl)
 {
     /* Used to choose among HT tables */
     s32(*ht_tbl_pointer)[RATE_COUNT];
 
     /* Check for invalid LQ type */
     if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
         tbl->expected_tpt = expected_tpt_legacy;
         return;
     }
 
     /* Legacy rates have only one table */
     if (is_legacy(tbl->lq_type)) {
         tbl->expected_tpt = expected_tpt_legacy;
         return;
     }
 
     /* Choose among many HT tables depending on number of streams
      * (SISO/MIMO2), channel width (20/40), SGI, and aggregation
      * status */
     if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
         ht_tbl_pointer = expected_tpt_siso20MHz;
     else if (is_siso(tbl->lq_type))
         ht_tbl_pointer = expected_tpt_siso40MHz;
     else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
     else            /* if (is_mimo2(tbl->lq_type)) <-- must be true */
         ht_tbl_pointer = expected_tpt_mimo2_40MHz;
 
     if (!tbl->is_SGI && !lq_sta->is_agg)    /* Normal */
         tbl->expected_tpt = ht_tbl_pointer[0];
     else if (tbl->is_SGI && !lq_sta->is_agg)    /* SGI */
         tbl->expected_tpt = ht_tbl_pointer[1];
     else if (!tbl->is_SGI && lq_sta->is_agg)    /* AGG */
         tbl->expected_tpt = ht_tbl_pointer[2];
     else            /* AGG+SGI */
         tbl->expected_tpt = ht_tbl_pointer[3];
 }
 
 /*
  * Find starting rate for new "search" high-throughput mode of modulation.
  * Goal is to find lowest expected rate (under perfect conditions) that is
  * above the current measured throughput of "active" mode, to give new mode
  * a fair chance to prove itself without too many challenges.
  *
  * This gets called when transitioning to more aggressive modulation
  * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
  * (i.e. MIMO to SISO).  When moving to MIMO, bit rate will typically need
  * to decrease to match "active" throughput.  When moving from MIMO to SISO,
  * bit rate will typically need to increase, but not if performance was bad.
  */
 static s32
 il4965_rs_get_best_rate(struct il_priv *il, struct il_lq_sta *lq_sta,
             struct il_scale_tbl_info *tbl,  /* "search" */
             u16 rate_mask, s8 idx)
 {
     /* "active" values */
     struct il_scale_tbl_info *active_tbl =
         &(lq_sta->lq_info[lq_sta->active_tbl]);
     s32 active_sr = active_tbl->win[idx].success_ratio;
     s32 active_tpt = active_tbl->expected_tpt[idx];
 
     /* expected "search" throughput */
     s32 *tpt_tbl = tbl->expected_tpt;
 
     s32 new_rate, high, low, start_hi;
     u16 high_low;
     s8 rate = idx;
 
     new_rate = high = low = start_hi = RATE_INVALID;
 
     for (;;) {
         high_low =
             il4965_rs_get_adjacent_rate(il, rate, rate_mask,
                         tbl->lq_type);
 
         low = high_low & 0xff;
         high = (high_low >> 8) & 0xff;
 
         /*
          * Lower the "search" bit rate, to give new "search" mode
          * approximately the same throughput as "active" if:
          *
          * 1) "Active" mode has been working modestly well (but not
          *    great), and expected "search" throughput (under perfect
          *    conditions) at candidate rate is above the actual
          *    measured "active" throughput (but less than expected
          *    "active" throughput under perfect conditions).
          * OR
          * 2) "Active" mode has been working perfectly or very well
          *    and expected "search" throughput (under perfect
          *    conditions) at candidate rate is above expected
          *    "active" throughput (under perfect conditions).
          */
         if ((100 * tpt_tbl[rate] > lq_sta->last_tpt &&
              (active_sr > RATE_DECREASE_TH && active_sr <= RATE_HIGH_TH
               && tpt_tbl[rate] <= active_tpt)) ||
             (active_sr >= RATE_SCALE_SWITCH &&
              tpt_tbl[rate] > active_tpt)) {
 
             /* (2nd or later pass)
              * If we've already tried to raise the rate, and are
              * now trying to lower it, use the higher rate. */
             if (start_hi != RATE_INVALID) {
                 new_rate = start_hi;
                 break;
             }
 
             new_rate = rate;
 
             /* Loop again with lower rate */
             if (low != RATE_INVALID)
                 rate = low;
 
             /* Lower rate not available, use the original */
             else
                 break;
 
             /* Else try to raise the "search" rate to match "active" */
         } else {
             /* (2nd or later pass)
              * If we've already tried to lower the rate, and are
              * now trying to raise it, use the lower rate. */
             if (new_rate != RATE_INVALID)
                 break;
 
             /* Loop again with higher rate */
             else if (high != RATE_INVALID) {
                 start_hi = high;
                 rate = high;
 
                 /* Higher rate not available, use the original */
             } else {
                 new_rate = rate;
                 break;
             }
         }
     }
 
     return new_rate;
 }
 
 /*
  * Set up search table for MIMO2
  */
 static int
 il4965_rs_switch_to_mimo2(struct il_priv *il, struct il_lq_sta *lq_sta,
               struct ieee80211_conf *conf,
               struct ieee80211_sta *sta,
               struct il_scale_tbl_info *tbl, int idx)
 {
     u16 rate_mask;
     s32 rate;
     s8 is_green = lq_sta->is_green;
 
     if (!conf_is_ht(conf) || !sta->deflink.ht_cap.ht_supported)
         return -1;
 
     if (sta->smps_mode == IEEE80211_SMPS_STATIC)
         return -1;
 
     /* Need both Tx chains/antennas to support MIMO */
     if (il->hw_params.tx_chains_num < 2)
         return -1;
 
     D_RATE("LQ: try to switch to MIMO2\n");
 
     tbl->lq_type = LQ_MIMO2;
     tbl->is_dup = lq_sta->is_dup;
     tbl->action = 0;
     tbl->max_search = IL_MAX_SEARCH;
     rate_mask = lq_sta->active_mimo2_rate;
 
     if (il_is_ht40_tx_allowed(il, &sta->deflink.ht_cap))
         tbl->is_ht40 = 1;
     else
         tbl->is_ht40 = 0;
 
     il4965_rs_set_expected_tpt_table(lq_sta, tbl);
 
     rate = il4965_rs_get_best_rate(il, lq_sta, tbl, rate_mask, idx);
 
     D_RATE("LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
     if (rate == RATE_INVALID || !((1 << rate) & rate_mask)) {
         D_RATE("Can't switch with idx %d rate mask %x\n", rate,
                rate_mask);
         return -1;
     }
     tbl->current_rate =
         il4965_rate_n_flags_from_tbl(il, tbl, rate, is_green);
 
     D_RATE("LQ: Switch to new mcs %X idx is green %X\n", tbl->current_rate,
            is_green);
     return 0;
 }
 
 /*
  * Set up search table for SISO
  */
 static int
 il4965_rs_switch_to_siso(struct il_priv *il, struct il_lq_sta *lq_sta,
              struct ieee80211_conf *conf, struct ieee80211_sta *sta,
              struct il_scale_tbl_info *tbl, int idx)
 {
     u16 rate_mask;
     u8 is_green = lq_sta->is_green;
     s32 rate;
 
     if (!conf_is_ht(conf) || !sta->deflink.ht_cap.ht_supported)
         return -1;
 
     D_RATE("LQ: try to switch to SISO\n");
 
     tbl->is_dup = lq_sta->is_dup;
     tbl->lq_type = LQ_SISO;
     tbl->action = 0;
     tbl->max_search = IL_MAX_SEARCH;
     rate_mask = lq_sta->active_siso_rate;
 
     if (il_is_ht40_tx_allowed(il, &sta->deflink.ht_cap))
         tbl->is_ht40 = 1;
     else
         tbl->is_ht40 = 0;
 
     if (is_green)
         tbl->is_SGI = 0;    /*11n spec: no SGI in SISO+Greenfield */
 
     il4965_rs_set_expected_tpt_table(lq_sta, tbl);
     rate = il4965_rs_get_best_rate(il, lq_sta, tbl, rate_mask, idx);
 
     D_RATE("LQ: get best rate %d mask %X\n", rate, rate_mask);
     if (rate == RATE_INVALID || !((1 << rate) & rate_mask)) {
         D_RATE("can not switch with idx %d rate mask %x\n", rate,
                rate_mask);
         return -1;
     }
     tbl->current_rate =
         il4965_rate_n_flags_from_tbl(il, tbl, rate, is_green);
     D_RATE("LQ: Switch to new mcs %X idx is green %X\n", tbl->current_rate,
            is_green);
     return 0;
 }
 
 /*
  * Try to switch to new modulation mode from legacy
  */
 static int
 il4965_rs_move_legacy_other(struct il_priv *il, struct il_lq_sta *lq_sta,
                 struct ieee80211_conf *conf,
                 struct ieee80211_sta *sta, int idx)
 {
     struct il_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
     struct il_scale_tbl_info *search_tbl =
         &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
     struct il_rate_scale_data *win = &(tbl->win[idx]);
     u32 sz =
         (sizeof(struct il_scale_tbl_info) -
          (sizeof(struct il_rate_scale_data) * RATE_COUNT));
     u8 start_action;
     u8 valid_tx_ant = il->hw_params.valid_tx_ant;
     u8 tx_chains_num = il->hw_params.tx_chains_num;
     int ret = 0;
     u8 update_search_tbl_counter = 0;
 
     tbl->action = IL_LEGACY_SWITCH_SISO;
 
     start_action = tbl->action;
     for (;;) {
         lq_sta->action_counter++;
         switch (tbl->action) {
         case IL_LEGACY_SWITCH_ANTENNA1:
         case IL_LEGACY_SWITCH_ANTENNA2:
             D_RATE("LQ: Legacy toggle Antenna\n");
 
             if ((tbl->action == IL_LEGACY_SWITCH_ANTENNA1 &&
                  tx_chains_num <= 1) ||
                 (tbl->action == IL_LEGACY_SWITCH_ANTENNA2 &&
                  tx_chains_num <= 2))
                 break;
 
             /* Don't change antenna if success has been great */
             if (win->success_ratio >= IL_RS_GOOD_RATIO)
                 break;
 
             /* Set up search table to try other antenna */
             memcpy(search_tbl, tbl, sz);
 
             if (il4965_rs_toggle_antenna
                 (valid_tx_ant, &search_tbl->current_rate,
                  search_tbl)) {
                 update_search_tbl_counter = 1;
                 il4965_rs_set_expected_tpt_table(lq_sta,
                                  search_tbl);
                 goto out;
             }
             break;
         case IL_LEGACY_SWITCH_SISO:
             D_RATE("LQ: Legacy switch to SISO\n");
 
             /* Set up search table to try SISO */
             memcpy(search_tbl, tbl, sz);
             search_tbl->is_SGI = 0;
             ret =
                 il4965_rs_switch_to_siso(il, lq_sta, conf, sta,
                              search_tbl, idx);
             if (!ret) {
                 lq_sta->action_counter = 0;
                 goto out;
             }
 
             break;
         case IL_LEGACY_SWITCH_MIMO2_AB:
         case IL_LEGACY_SWITCH_MIMO2_AC:
         case IL_LEGACY_SWITCH_MIMO2_BC:
             D_RATE("LQ: Legacy switch to MIMO2\n");
 
             /* Set up search table to try MIMO */
             memcpy(search_tbl, tbl, sz);
             search_tbl->is_SGI = 0;
 
             if (tbl->action == IL_LEGACY_SWITCH_MIMO2_AB)
                 search_tbl->ant_type = ANT_AB;
             else if (tbl->action == IL_LEGACY_SWITCH_MIMO2_AC)
                 search_tbl->ant_type = ANT_AC;
             else
                 search_tbl->ant_type = ANT_BC;
 
             if (!il4965_rs_is_valid_ant
                 (valid_tx_ant, search_tbl->ant_type))
                 break;
 
             ret =
                 il4965_rs_switch_to_mimo2(il, lq_sta, conf, sta,
                               search_tbl, idx);
             if (!ret) {
                 lq_sta->action_counter = 0;
                 goto out;
             }
             break;
         }
         tbl->action++;
         if (tbl->action > IL_LEGACY_SWITCH_MIMO2_BC)
             tbl->action = IL_LEGACY_SWITCH_ANTENNA1;
 
         if (tbl->action == start_action)
             break;
 
     }
     search_tbl->lq_type = LQ_NONE;
     return 0;
 
 out:
     lq_sta->search_better_tbl = 1;
     tbl->action++;
     if (tbl->action > IL_LEGACY_SWITCH_MIMO2_BC)
         tbl->action = IL_LEGACY_SWITCH_ANTENNA1;
     if (update_search_tbl_counter)
         search_tbl->action = tbl->action;
     return 0;
 
 }
 
 /*
  * Try to switch to new modulation mode from SISO
  */
 static int
 il4965_rs_move_siso_to_other(struct il_priv *il, struct il_lq_sta *lq_sta,
                  struct ieee80211_conf *conf,
                  struct ieee80211_sta *sta, int idx)
 {
     u8 is_green = lq_sta->is_green;
     struct il_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
     struct il_scale_tbl_info *search_tbl =
         &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
     struct il_rate_scale_data *win = &(tbl->win[idx]);
     struct ieee80211_sta_ht_cap *ht_cap = &sta->deflink.ht_cap;
     u32 sz =
         (sizeof(struct il_scale_tbl_info) -
          (sizeof(struct il_rate_scale_data) * RATE_COUNT));
     u8 start_action;
     u8 valid_tx_ant = il->hw_params.valid_tx_ant;
     u8 tx_chains_num = il->hw_params.tx_chains_num;
     u8 update_search_tbl_counter = 0;
     int ret;
 
     start_action = tbl->action;
 
     for (;;) {
         lq_sta->action_counter++;
         switch (tbl->action) {
         case IL_SISO_SWITCH_ANTENNA1:
         case IL_SISO_SWITCH_ANTENNA2:
             D_RATE("LQ: SISO toggle Antenna\n");
             if ((tbl->action == IL_SISO_SWITCH_ANTENNA1 &&
                  tx_chains_num <= 1) ||
                 (tbl->action == IL_SISO_SWITCH_ANTENNA2 &&
                  tx_chains_num <= 2))
                 break;
 
             if (win->success_ratio >= IL_RS_GOOD_RATIO)
                 break;
 
             memcpy(search_tbl, tbl, sz);
             if (il4965_rs_toggle_antenna
                 (valid_tx_ant, &search_tbl->current_rate,
                  search_tbl)) {
                 update_search_tbl_counter = 1;
                 goto out;
             }
             break;
         case IL_SISO_SWITCH_MIMO2_AB:
         case IL_SISO_SWITCH_MIMO2_AC:
         case IL_SISO_SWITCH_MIMO2_BC:
             D_RATE("LQ: SISO switch to MIMO2\n");
             memcpy(search_tbl, tbl, sz);
             search_tbl->is_SGI = 0;
 
             if (tbl->action == IL_SISO_SWITCH_MIMO2_AB)
                 search_tbl->ant_type = ANT_AB;
             else if (tbl->action == IL_SISO_SWITCH_MIMO2_AC)
                 search_tbl->ant_type = ANT_AC;
             else
                 search_tbl->ant_type = ANT_BC;
 
             if (!il4965_rs_is_valid_ant
                 (valid_tx_ant, search_tbl->ant_type))
                 break;
 
             ret =
                 il4965_rs_switch_to_mimo2(il, lq_sta, conf, sta,
                               search_tbl, idx);
             if (!ret)
                 goto out;
             break;
         case IL_SISO_SWITCH_GI:
             if (!tbl->is_ht40 &&
                 !(ht_cap->cap & IEEE80211_HT_CAP_SGI_20))
                 break;
             if (tbl->is_ht40 &&
                 !(ht_cap->cap & IEEE80211_HT_CAP_SGI_40))
                 break;
 
             D_RATE("LQ: SISO toggle SGI/NGI\n");
 
             memcpy(search_tbl, tbl, sz);
             if (is_green) {
                 if (!tbl->is_SGI)
                     break;
                 else
                     IL_ERR("SGI was set in GF+SISO\n");
             }
             search_tbl->is_SGI = !tbl->is_SGI;
             il4965_rs_set_expected_tpt_table(lq_sta, search_tbl);
             if (tbl->is_SGI) {
                 s32 tpt = lq_sta->last_tpt / 100;
                 if (tpt >= search_tbl->expected_tpt[idx])
                     break;
             }
             search_tbl->current_rate =
                 il4965_rate_n_flags_from_tbl(il, search_tbl, idx,
                              is_green);
             update_search_tbl_counter = 1;
             goto out;
         }
         tbl->action++;
         if (tbl->action > IL_SISO_SWITCH_GI)
             tbl->action = IL_SISO_SWITCH_ANTENNA1;
 
         if (tbl->action == start_action)
             break;
     }
     search_tbl->lq_type = LQ_NONE;
     return 0;
 
 out:
     lq_sta->search_better_tbl = 1;
     tbl->action++;
     if (tbl->action > IL_SISO_SWITCH_GI)
         tbl->action = IL_SISO_SWITCH_ANTENNA1;
     if (update_search_tbl_counter)
         search_tbl->action = tbl->action;
 
     return 0;
 }
 
 /*
  * Try to switch to new modulation mode from MIMO2
  */
 static int
 il4965_rs_move_mimo2_to_other(struct il_priv *il, struct il_lq_sta *lq_sta,
                   struct ieee80211_conf *conf,
                   struct ieee80211_sta *sta, int idx)
 {
     s8 is_green = lq_sta->is_green;
     struct il_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
     struct il_scale_tbl_info *search_tbl =
         &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
     struct il_rate_scale_data *win = &(tbl->win[idx]);
     struct ieee80211_sta_ht_cap *ht_cap = &sta->deflink.ht_cap;
     u32 sz =
         (sizeof(struct il_scale_tbl_info) -
          (sizeof(struct il_rate_scale_data) * RATE_COUNT));
     u8 start_action;
     u8 valid_tx_ant = il->hw_params.valid_tx_ant;
     u8 tx_chains_num = il->hw_params.tx_chains_num;
     u8 update_search_tbl_counter = 0;
     int ret;
 
     start_action = tbl->action;
     for (;;) {
         lq_sta->action_counter++;
         switch (tbl->action) {
         case IL_MIMO2_SWITCH_ANTENNA1:
         case IL_MIMO2_SWITCH_ANTENNA2:
             D_RATE("LQ: MIMO2 toggle Antennas\n");
 
             if (tx_chains_num <= 2)
                 break;
 
             if (win->success_ratio >= IL_RS_GOOD_RATIO)
                 break;
 
             memcpy(search_tbl, tbl, sz);
             if (il4965_rs_toggle_antenna
                 (valid_tx_ant, &search_tbl->current_rate,
                  search_tbl)) {
                 update_search_tbl_counter = 1;
                 goto out;
             }
             break;
         case IL_MIMO2_SWITCH_SISO_A:
         case IL_MIMO2_SWITCH_SISO_B:
         case IL_MIMO2_SWITCH_SISO_C:
             D_RATE("LQ: MIMO2 switch to SISO\n");
 
             /* Set up new search table for SISO */
             memcpy(search_tbl, tbl, sz);
 
             if (tbl->action == IL_MIMO2_SWITCH_SISO_A)
                 search_tbl->ant_type = ANT_A;
             else if (tbl->action == IL_MIMO2_SWITCH_SISO_B)
                 search_tbl->ant_type = ANT_B;
             else
                 search_tbl->ant_type = ANT_C;
 
             if (!il4965_rs_is_valid_ant
                 (valid_tx_ant, search_tbl->ant_type))
                 break;
 
             ret =
                 il4965_rs_switch_to_siso(il, lq_sta, conf, sta,
                              search_tbl, idx);
             if (!ret)
                 goto out;
 
             break;
 
         case IL_MIMO2_SWITCH_GI:
             if (!tbl->is_ht40 &&
                 !(ht_cap->cap & IEEE80211_HT_CAP_SGI_20))
                 break;
             if (tbl->is_ht40 &&
                 !(ht_cap->cap & IEEE80211_HT_CAP_SGI_40))
                 break;
 
             D_RATE("LQ: MIMO2 toggle SGI/NGI\n");
 
             /* Set up new search table for MIMO2 */
             memcpy(search_tbl, tbl, sz);
             search_tbl->is_SGI = !tbl->is_SGI;
             il4965_rs_set_expected_tpt_table(lq_sta, search_tbl);
             /*
              * If active table already uses the fastest possible
              * modulation (dual stream with short guard interval),
              * and it's working well, there's no need to look
              * for a better type of modulation!
              */
             if (tbl->is_SGI) {
                 s32 tpt = lq_sta->last_tpt / 100;
                 if (tpt >= search_tbl->expected_tpt[idx])
                     break;
             }
             search_tbl->current_rate =
                 il4965_rate_n_flags_from_tbl(il, search_tbl, idx,
                              is_green);
             update_search_tbl_counter = 1;
             goto out;
 
         }
         tbl->action++;
         if (tbl->action > IL_MIMO2_SWITCH_GI)
             tbl->action = IL_MIMO2_SWITCH_ANTENNA1;
 
         if (tbl->action == start_action)
             break;
     }
     search_tbl->lq_type = LQ_NONE;
     return 0;
 out:
     lq_sta->search_better_tbl = 1;
     tbl->action++;
     if (tbl->action > IL_MIMO2_SWITCH_GI)
         tbl->action = IL_MIMO2_SWITCH_ANTENNA1;
     if (update_search_tbl_counter)
         search_tbl->action = tbl->action;
 
     return 0;
 
 }
 
 /*
  * Check whether we should continue using same modulation mode, or
  * begin search for a new mode, based on:
  * 1) # tx successes or failures while using this mode
  * 2) # times calling this function
  * 3) elapsed time in this mode (not used, for now)
  */
 static void
 il4965_rs_stay_in_table(struct il_lq_sta *lq_sta, bool force_search)
 {
     struct il_scale_tbl_info *tbl;
     int i;
     int active_tbl;
     int flush_interval_passed = 0;
     struct il_priv *il;
 
     il = lq_sta->drv;
     active_tbl = lq_sta->active_tbl;
 
     tbl = &(lq_sta->lq_info[active_tbl]);
 
     /* If we've been disallowing search, see if we should now allow it */
     if (lq_sta->stay_in_tbl) {
 
         /* Elapsed time using current modulation mode */
         if (lq_sta->flush_timer)
             flush_interval_passed =
                 time_after(jiffies,
                        (unsigned long)(lq_sta->flush_timer +
                                RATE_SCALE_FLUSH_INTVL));
 
         /*
          * Check if we should allow search for new modulation mode.
          * If many frames have failed or succeeded, or we've used
          * this same modulation for a long time, allow search, and
          * reset history stats that keep track of whether we should
          * allow a new search.  Also (below) reset all bitmaps and
          * stats in active history.
          */
         if (force_search ||
             lq_sta->total_failed > lq_sta->max_failure_limit ||
             lq_sta->total_success > lq_sta->max_success_limit ||
             (!lq_sta->search_better_tbl && lq_sta->flush_timer &&
              flush_interval_passed)) {
             D_RATE("LQ: stay is expired %d %d %d\n",
                    lq_sta->total_failed, lq_sta->total_success,
                    flush_interval_passed);
 
             /* Allow search for new mode */
             lq_sta->stay_in_tbl = 0;    /* only place reset */
             lq_sta->total_failed = 0;
             lq_sta->total_success = 0;
             lq_sta->flush_timer = 0;
 
             /*
              * Else if we've used this modulation mode enough repetitions
              * (regardless of elapsed time or success/failure), reset
              * history bitmaps and rate-specific stats for all rates in
              * active table.
              */
         } else {
             lq_sta->table_count++;
             if (lq_sta->table_count >= lq_sta->table_count_limit) {
                 lq_sta->table_count = 0;
 
                 D_RATE("LQ: stay in table clear win\n");
                 for (i = 0; i < RATE_COUNT; i++)
                     il4965_rs_rate_scale_clear_win(&
                                        (tbl->
                                     win
                                     [i]));
             }
         }
 
         /* If transitioning to allow "search", reset all history
          * bitmaps and stats in active table (this will become the new
          * "search" table). */
         if (!lq_sta->stay_in_tbl) {
             for (i = 0; i < RATE_COUNT; i++)
                 il4965_rs_rate_scale_clear_win(&(tbl->win[i]));
         }
     }
 }
 
 /*
  * setup rate table in uCode
  */
 static void
 il4965_rs_update_rate_tbl(struct il_priv *il, struct il_lq_sta *lq_sta,
               struct il_scale_tbl_info *tbl, int idx, u8 is_green)
 {
     u32 rate;
 
     /* Update uCode's rate table. */
     rate = il4965_rate_n_flags_from_tbl(il, tbl, idx, is_green);
     il4965_rs_fill_link_cmd(il, lq_sta, rate);
     il_send_lq_cmd(il, &lq_sta->lq, CMD_ASYNC, false);
 }
 
 /*
  * Do rate scaling and search for new modulation mode.
  */
 static void
 il4965_rs_rate_scale_perform(struct il_priv *il, struct sk_buff *skb,
                  struct ieee80211_sta *sta,
                  struct il_lq_sta *lq_sta)
 {
     struct ieee80211_hw *hw = il->hw;
     struct ieee80211_conf *conf = &hw->conf;
     struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
     struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
     int low = RATE_INVALID;
     int high = RATE_INVALID;
     int idx;
     int i;
     struct il_rate_scale_data *win = NULL;
     int current_tpt = IL_INVALID_VALUE;
     int low_tpt = IL_INVALID_VALUE;
     int high_tpt = IL_INVALID_VALUE;
     u32 fail_count;
     s8 scale_action = 0;
     u16 rate_mask;
     u8 update_lq = 0;
     struct il_scale_tbl_info *tbl, *tbl1;
     u16 rate_scale_idx_msk = 0;
     u8 is_green = 0;
     u8 active_tbl = 0;
     u8 done_search = 0;
     u16 high_low;
     s32 sr;
     u8 tid;
     struct il_tid_data *tid_data;
 
     D_RATE("rate scale calculate new rate for skb\n");
 
     /* Send management frames and NO_ACK data using lowest rate. */
     /* TODO: this could probably be improved.. */
     if (!ieee80211_is_data(hdr->frame_control) ||
         (info->flags & IEEE80211_TX_CTL_NO_ACK))
         return;
 
     lq_sta->supp_rates = sta->deflink.supp_rates[lq_sta->band];
 
     tid = il4965_rs_tl_add_packet(lq_sta, hdr);
     if (tid != MAX_TID_COUNT && (lq_sta->tx_agg_tid_en & (1 << tid))) {
         tid_data = &il->stations[lq_sta->lq.sta_id].tid[tid];
         if (tid_data->agg.state == IL_AGG_OFF)
             lq_sta->is_agg = 0;
         else
             lq_sta->is_agg = 1;
     } else
         lq_sta->is_agg = 0;
 
     /*
      * Select rate-scale / modulation-mode table to work with in
      * the rest of this function:  "search" if searching for better
      * modulation mode, or "active" if doing rate scaling within a mode.
      */
     if (!lq_sta->search_better_tbl)
         active_tbl = lq_sta->active_tbl;
     else
         active_tbl = 1 - lq_sta->active_tbl;
 
     tbl = &(lq_sta->lq_info[active_tbl]);
     if (is_legacy(tbl->lq_type))
         lq_sta->is_green = 0;
     else
         lq_sta->is_green = il4965_rs_use_green(il, sta);
     is_green = lq_sta->is_green;
 
     /* current tx rate */
     idx = lq_sta->last_txrate_idx;
 
     D_RATE("Rate scale idx %d for type %d\n", idx, tbl->lq_type);
 
     /* rates available for this association, and for modulation mode */
     rate_mask = il4965_rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
 
     D_RATE("mask 0x%04X\n", rate_mask);
 
     /* mask with station rate restriction */
     if (is_legacy(tbl->lq_type)) {
         if (lq_sta->band == NL80211_BAND_5GHZ)
             /* supp_rates has no CCK bits in A mode */
             rate_scale_idx_msk =
                 (u16) (rate_mask &
                    (lq_sta->supp_rates << IL_FIRST_OFDM_RATE));
         else
             rate_scale_idx_msk =
                 (u16) (rate_mask & lq_sta->supp_rates);
 
     } else
         rate_scale_idx_msk = rate_mask;
 
     if (!rate_scale_idx_msk)
         rate_scale_idx_msk = rate_mask;
 
     if (!((1 << idx) & rate_scale_idx_msk)) {
         IL_ERR("Current Rate is not valid\n");
         if (lq_sta->search_better_tbl) {
             /* revert to active table if search table is not valid */
             tbl->lq_type = LQ_NONE;
             lq_sta->search_better_tbl = 0;
             tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
             /* get "active" rate info */
             idx = il4965_hwrate_to_plcp_idx(tbl->current_rate);
             il4965_rs_update_rate_tbl(il, lq_sta, tbl, idx,
                               is_green);
         }
         return;
     }
 
     /* Get expected throughput table and history win for current rate */
     if (!tbl->expected_tpt) {
         IL_ERR("tbl->expected_tpt is NULL\n");
         return;
     }
 
     /* force user max rate if set by user */
     if (lq_sta->max_rate_idx != -1 && lq_sta->max_rate_idx < idx) {
         idx = lq_sta->max_rate_idx;
         update_lq = 1;
         win = &(tbl->win[idx]);
         goto lq_update;
     }
 
     win = &(tbl->win[idx]);
 
     /*
      * If there is not enough history to calculate actual average
      * throughput, keep analyzing results of more tx frames, without
      * changing rate or mode (bypass most of the rest of this function).
      * Set up new rate table in uCode only if old rate is not supported
      * in current association (use new rate found above).
      */
     fail_count = win->counter - win->success_counter;
     if (fail_count < RATE_MIN_FAILURE_TH &&
         win->success_counter < RATE_MIN_SUCCESS_TH) {
         D_RATE("LQ: still below TH. succ=%d total=%d " "for idx %d\n",
                win->success_counter, win->counter, idx);
 
         /* Can't calculate this yet; not enough history */
         win->average_tpt = IL_INVALID_VALUE;
 
         /* Should we stay with this modulation mode,
          * or search for a new one? */
         il4965_rs_stay_in_table(lq_sta, false);
 
         goto out;
     }
     /* Else we have enough samples; calculate estimate of
      * actual average throughput */
     if (win->average_tpt !=
         ((win->success_ratio * tbl->expected_tpt[idx] + 64) / 128)) {
         IL_ERR("expected_tpt should have been calculated by now\n");
         win->average_tpt =
             ((win->success_ratio * tbl->expected_tpt[idx] + 64) / 128);
     }
 
     /* If we are searching for better modulation mode, check success. */
     if (lq_sta->search_better_tbl) {
         /* If good success, continue using the "search" mode;
          * no need to send new link quality command, since we're
          * continuing to use the setup that we've been trying. */
         if (win->average_tpt > lq_sta->last_tpt) {
 
             D_RATE("LQ: SWITCHING TO NEW TBL "
                    "suc=%d cur-tpt=%d old-tpt=%d\n",
                    win->success_ratio, win->average_tpt,
                    lq_sta->last_tpt);
 
             if (!is_legacy(tbl->lq_type))
                 lq_sta->enable_counter = 1;
 
             /* Swap tables; "search" becomes "active" */
             lq_sta->active_tbl = active_tbl;
             current_tpt = win->average_tpt;
 
             /* Else poor success; go back to mode in "active" table */
         } else {
 
             D_RATE("LQ: GOING BACK TO THE OLD TBL "
                    "suc=%d cur-tpt=%d old-tpt=%d\n",
                    win->success_ratio, win->average_tpt,
                    lq_sta->last_tpt);
 
             /* Nullify "search" table */
             tbl->lq_type = LQ_NONE;
 
             /* Revert to "active" table */
             active_tbl = lq_sta->active_tbl;
             tbl = &(lq_sta->lq_info[active_tbl]);
 
             /* Revert to "active" rate and throughput info */
             idx = il4965_hwrate_to_plcp_idx(tbl->current_rate);
             current_tpt = lq_sta->last_tpt;
 
             /* Need to set up a new rate table in uCode */
             update_lq = 1;
         }
 
         /* Either way, we've made a decision; modulation mode
          * search is done, allow rate adjustment next time. */
         lq_sta->search_better_tbl = 0;
         done_search = 1;    /* Don't switch modes below! */
         goto lq_update;
     }
 
     /* (Else) not in search of better modulation mode, try for better
      * starting rate, while staying in this mode. */
     high_low =
         il4965_rs_get_adjacent_rate(il, idx, rate_scale_idx_msk,
                     tbl->lq_type);
     low = high_low & 0xff;
     high = (high_low >> 8) & 0xff;
 
     /* If user set max rate, dont allow higher than user constrain */
     if (lq_sta->max_rate_idx != -1 && lq_sta->max_rate_idx < high)
         high = RATE_INVALID;
 
     sr = win->success_ratio;
 
     /* Collect measured throughputs for current and adjacent rates */
     current_tpt = win->average_tpt;
     if (low != RATE_INVALID)
         low_tpt = tbl->win[low].average_tpt;
     if (high != RATE_INVALID)
         high_tpt = tbl->win[high].average_tpt;
 
     scale_action = 0;
 
     /* Too many failures, decrease rate */
     if (sr <= RATE_DECREASE_TH || current_tpt == 0) {
         D_RATE("decrease rate because of low success_ratio\n");
         scale_action = -1;
 
         /* No throughput measured yet for adjacent rates; try increase. */
     } else if (low_tpt == IL_INVALID_VALUE && high_tpt == IL_INVALID_VALUE) {
 
         if (high != RATE_INVALID && sr >= RATE_INCREASE_TH)
             scale_action = 1;
         else if (low != RATE_INVALID)
             scale_action = 0;
     }
 
     /* Both adjacent throughputs are measured, but neither one has better
      * throughput; we're using the best rate, don't change it! */
     else if (low_tpt != IL_INVALID_VALUE && high_tpt != IL_INVALID_VALUE &&
          low_tpt < current_tpt && high_tpt < current_tpt)
         scale_action = 0;
 
     /* At least one adjacent rate's throughput is measured,
      * and may have better performance. */
     else {
         /* Higher adjacent rate's throughput is measured */
         if (high_tpt != IL_INVALID_VALUE) {
             /* Higher rate has better throughput */
             if (high_tpt > current_tpt && sr >= RATE_INCREASE_TH)
                 scale_action = 1;
             else
                 scale_action = 0;
 
             /* Lower adjacent rate's throughput is measured */
         } else if (low_tpt != IL_INVALID_VALUE) {
             /* Lower rate has better throughput */
             if (low_tpt > current_tpt) {
                 D_RATE("decrease rate because of low tpt\n");
                 scale_action = -1;
             } else if (sr >= RATE_INCREASE_TH) {
                 scale_action = 1;
             }
         }
     }
 
     /* Sanity check; asked for decrease, but success rate or throughput
      * has been good at old rate.  Don't change it. */
     if (scale_action == -1 && low != RATE_INVALID &&
         (sr > RATE_HIGH_TH || current_tpt > 100 * tbl->expected_tpt[low]))
         scale_action = 0;
 
     switch (scale_action) {
     case -1:
         /* Decrease starting rate, update uCode's rate table */
         if (low != RATE_INVALID) {
             update_lq = 1;
             idx = low;
         }
 
         break;
     case 1:
         /* Increase starting rate, update uCode's rate table */
         if (high != RATE_INVALID) {
             update_lq = 1;
             idx = high;
         }
 
         break;
     case 0:
         /* No change */
     default:
         break;
     }
 
     D_RATE("choose rate scale idx %d action %d low %d " "high %d type %d\n",
            idx, scale_action, low, high, tbl->lq_type);
 
 lq_update:
     /* Replace uCode's rate table for the destination station. */
     if (update_lq)
         il4965_rs_update_rate_tbl(il, lq_sta, tbl, idx, is_green);
 
     /* Should we stay with this modulation mode,
      * or search for a new one? */
     il4965_rs_stay_in_table(lq_sta, false);
 
     /*
      * Search for new modulation mode if we're:
      * 1)  Not changing rates right now
      * 2)  Not just finishing up a search
      * 3)  Allowing a new search
      */
     if (!update_lq && !done_search && !lq_sta->stay_in_tbl && win->counter) {
         /* Save current throughput to compare with "search" throughput */
         lq_sta->last_tpt = current_tpt;
 
         /* Select a new "search" modulation mode to try.
          * If one is found, set up the new "search" table. */
         if (is_legacy(tbl->lq_type))
             il4965_rs_move_legacy_other(il, lq_sta, conf, sta, idx);
         else if (is_siso(tbl->lq_type))
             il4965_rs_move_siso_to_other(il, lq_sta, conf, sta,
                              idx);
         else        /* (is_mimo2(tbl->lq_type)) */
             il4965_rs_move_mimo2_to_other(il, lq_sta, conf, sta,
                               idx);
 
         /* If new "search" mode was selected, set up in uCode table */
         if (lq_sta->search_better_tbl) {
             /* Access the "search" table, clear its history. */
             tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
             for (i = 0; i < RATE_COUNT; i++)
                 il4965_rs_rate_scale_clear_win(&(tbl->win[i]));
 
             /* Use new "search" start rate */
             idx = il4965_hwrate_to_plcp_idx(tbl->current_rate);
 
             D_RATE("Switch current  mcs: %X idx: %d\n",
                    tbl->current_rate, idx);
             il4965_rs_fill_link_cmd(il, lq_sta, tbl->current_rate);
             il_send_lq_cmd(il, &lq_sta->lq, CMD_ASYNC, false);
         } else
             done_search = 1;
     }
 
     if (done_search && !lq_sta->stay_in_tbl) {
         /* If the "active" (non-search) mode was legacy,
          * and we've tried switching antennas,
          * but we haven't been able to try HT modes (not available),
          * stay with best antenna legacy modulation for a while
          * before next round of mode comparisons. */
         tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
         if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
             lq_sta->action_counter > tbl1->max_search) {
             D_RATE("LQ: STAY in legacy table\n");
             il4965_rs_set_stay_in_table(il, 1, lq_sta);
         }
 
         /* If we're in an HT mode, and all 3 mode switch actions
          * have been tried and compared, stay in this best modulation
          * mode for a while before next round of mode comparisons. */
         if (lq_sta->enable_counter &&
             lq_sta->action_counter >= tbl1->max_search) {
             if (lq_sta->last_tpt > IL_AGG_TPT_THREHOLD &&
                 (lq_sta->tx_agg_tid_en & (1 << tid)) &&
                 tid != MAX_TID_COUNT) {
                 tid_data =
                     &il->stations[lq_sta->lq.sta_id].tid[tid];
                 if (tid_data->agg.state == IL_AGG_OFF) {
                     D_RATE("try to aggregate tid %d\n",
                            tid);
                     il4965_rs_tl_turn_on_agg(il, tid,
                                  lq_sta, sta);
                 }
             }
             il4965_rs_set_stay_in_table(il, 0, lq_sta);
         }
     }
 
 out:
     tbl->current_rate =
         il4965_rate_n_flags_from_tbl(il, tbl, idx, is_green);
     i = idx;
     lq_sta->last_txrate_idx = i;
 }
 
 /*
  * il4965_rs_initialize_lq - Initialize a station's hardware rate table
  *
  * The uCode's station table contains a table of fallback rates
  * for automatic fallback during transmission.
  *
  * NOTE: This sets up a default set of values.  These will be replaced later
  *       if the driver's iwl-4965-rs rate scaling algorithm is used, instead of
  *       rc80211_simple.
  *
  * NOTE: Run C_ADD_STA command to set up station table entry, before
  *       calling this function (which runs C_TX_LINK_QUALITY_CMD,
  *       which requires station table entry to exist).
  */
 static void
 il4965_rs_initialize_lq(struct il_priv *il, struct ieee80211_conf *conf,
             struct ieee80211_sta *sta, struct il_lq_sta *lq_sta)
 {
     struct il_scale_tbl_info *tbl;
     int rate_idx;
     int i;
     u32 rate;
     u8 use_green;
     u8 active_tbl = 0;
     u8 valid_tx_ant;
 
     if (!sta || !lq_sta)
         return;
 
     use_green = il4965_rs_use_green(il, sta);
 
     i = lq_sta->last_txrate_idx;
 
     valid_tx_ant = il->hw_params.valid_tx_ant;
 
     if (!lq_sta->search_better_tbl)
         active_tbl = lq_sta->active_tbl;
     else
         active_tbl = 1 - lq_sta->active_tbl;
 
     tbl = &(lq_sta->lq_info[active_tbl]);
 
     if (i < 0 || i >= RATE_COUNT)
         i = 0;
 
     rate = il_rates[i].plcp;
     tbl->ant_type = il4965_first_antenna(valid_tx_ant);
     rate |= tbl->ant_type << RATE_MCS_ANT_POS;
 
     if (i >= IL_FIRST_CCK_RATE && i <= IL_LAST_CCK_RATE)
         rate |= RATE_MCS_CCK_MSK;
 
     il4965_rs_get_tbl_info_from_mcs(rate, il->band, tbl, &rate_idx);
     if (!il4965_rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
         il4965_rs_toggle_antenna(valid_tx_ant, &rate, tbl);
 
     rate = il4965_rate_n_flags_from_tbl(il, tbl, rate_idx, use_green);
     tbl->current_rate = rate;
     il4965_rs_set_expected_tpt_table(lq_sta, tbl);
     il4965_rs_fill_link_cmd(NULL, lq_sta, rate);
     il->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq;
     il_send_lq_cmd(il, &lq_sta->lq, CMD_SYNC, true);
 }
 
 static void
 il4965_rs_get_rate(void *il_r, struct ieee80211_sta *sta, void *il_sta,
            struct ieee80211_tx_rate_control *txrc)
 {
 
     struct sk_buff *skb = txrc->skb;
     struct ieee80211_supported_band *sband = txrc->sband;
     struct il_priv *il __maybe_unused = (struct il_priv *)il_r;
     struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
     struct il_lq_sta *lq_sta = il_sta;
     int rate_idx;
 
     D_RATE("rate scale calculate new rate for skb\n");
 
     /* Get max rate if user set max rate */
     if (lq_sta) {
         lq_sta->max_rate_idx = fls(txrc->rate_idx_mask) - 1;
         if (sband->band == NL80211_BAND_5GHZ &&
             lq_sta->max_rate_idx != -1)
             lq_sta->max_rate_idx += IL_FIRST_OFDM_RATE;
         if (lq_sta->max_rate_idx < 0 ||
             lq_sta->max_rate_idx >= RATE_COUNT)
             lq_sta->max_rate_idx = -1;
     }
 
     /* Treat uninitialized rate scaling data same as non-existing. */
     if (lq_sta && !lq_sta->drv) {
         D_RATE("Rate scaling not initialized yet.\n");
         il_sta = NULL;
     }
 
     if (!lq_sta)
         return;
 
     rate_idx = lq_sta->last_txrate_idx;
 
     if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
         rate_idx -= IL_FIRST_OFDM_RATE;
         /* 6M and 9M shared same MCS idx */
         rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
         if (il4965_rs_extract_rate(lq_sta->last_rate_n_flags) >=
             RATE_MIMO2_6M_PLCP)
             rate_idx = rate_idx + MCS_IDX_PER_STREAM;
         info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
         if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
             info->control.rates[0].flags |=
                 IEEE80211_TX_RC_SHORT_GI;
         if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
             info->control.rates[0].flags |=
                 IEEE80211_TX_RC_DUP_DATA;
         if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
             info->control.rates[0].flags |=
                 IEEE80211_TX_RC_40_MHZ_WIDTH;
         if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
             info->control.rates[0].flags |=
                 IEEE80211_TX_RC_GREEN_FIELD;
     } else {
         /* Check for invalid rates */
         if (rate_idx < 0 || rate_idx >= RATE_COUNT_LEGACY ||
             (sband->band == NL80211_BAND_5GHZ &&
              rate_idx < IL_FIRST_OFDM_RATE))
             rate_idx = rate_lowest_index(sband, sta);
         /* On valid 5 GHz rate, adjust idx */
         else if (sband->band == NL80211_BAND_5GHZ)
             rate_idx -= IL_FIRST_OFDM_RATE;
         info->control.rates[0].flags = 0;
     }
     info->control.rates[0].idx = rate_idx;
     info->control.rates[0].count = 1;
 }
 
 static void *
 il4965_rs_alloc_sta(void *il_rate, struct ieee80211_sta *sta, gfp_t gfp)
 {
     struct il_station_priv *sta_priv =
         (struct il_station_priv *)sta->drv_priv;
     struct il_priv *il;
 
     il = (struct il_priv *)il_rate;
     D_RATE("create station rate scale win\n");
 
     return &sta_priv->lq_sta;
 }
 
 /*
  * Called after adding a new station to initialize rate scaling
  */
 void
 il4965_rs_rate_init(struct il_priv *il, struct ieee80211_sta *sta, u8 sta_id)
 {
     int i, j;
     struct ieee80211_hw *hw = il->hw;
     struct ieee80211_conf *conf = &il->hw->conf;
     struct ieee80211_sta_ht_cap *ht_cap = &sta->deflink.ht_cap;
     struct il_station_priv *sta_priv;
     struct il_lq_sta *lq_sta;
     struct ieee80211_supported_band *sband;
 
     sta_priv = (struct il_station_priv *)sta->drv_priv;
     lq_sta = &sta_priv->lq_sta;
     sband = hw->wiphy->bands[conf->chandef.chan->band];
 
     lq_sta->lq.sta_id = sta_id;
 
     for (j = 0; j < LQ_SIZE; j++)
         for (i = 0; i < RATE_COUNT; i++)
             il4965_rs_rate_scale_clear_win(&lq_sta->lq_info[j].
                                win[i]);
 
     lq_sta->flush_timer = 0;
     lq_sta->supp_rates = sta->deflink.supp_rates[sband->band];
     for (j = 0; j < LQ_SIZE; j++)
         for (i = 0; i < RATE_COUNT; i++)
             il4965_rs_rate_scale_clear_win(&lq_sta->lq_info[j].
                                win[i]);
 
     D_RATE("LQ:" "*** rate scale station global init for station %d ***\n",
            sta_id);
     /* 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.. */
 
     lq_sta->is_dup = 0;
     lq_sta->max_rate_idx = -1;
     lq_sta->missed_rate_counter = IL_MISSED_RATE_MAX;
     lq_sta->is_green = il4965_rs_use_green(il, sta);
     lq_sta->active_legacy_rate = il->active_rate & ~(0x1000);
     lq_sta->band = il->band;
     /*
      * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
      * supp_rates[] does not; shift to convert format, force 9 MBits off.
      */
     lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
     lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
     lq_sta->active_siso_rate &= ~((u16) 0x2);
     lq_sta->active_siso_rate <<= IL_FIRST_OFDM_RATE;
 
     /* Same here */
     lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
     lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
     lq_sta->active_mimo2_rate &= ~((u16) 0x2);
     lq_sta->active_mimo2_rate <<= IL_FIRST_OFDM_RATE;
 
     /* These values will be overridden later */
     lq_sta->lq.general_params.single_stream_ant_msk =
         il4965_first_antenna(il->hw_params.valid_tx_ant);
     lq_sta->lq.general_params.dual_stream_ant_msk =
         il->hw_params.valid_tx_ant & ~il4965_first_antenna(il->hw_params.
                                    valid_tx_ant);
     if (!lq_sta->lq.general_params.dual_stream_ant_msk) {
         lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
     } else if (il4965_num_of_ant(il->hw_params.valid_tx_ant) == 2) {
         lq_sta->lq.general_params.dual_stream_ant_msk =
             il->hw_params.valid_tx_ant;
     }
 
     /* as default allow aggregation for all tids */
     lq_sta->tx_agg_tid_en = IL_AGG_ALL_TID;
     lq_sta->drv = il;
 
     /* Set last_txrate_idx to lowest rate */
     lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
     if (sband->band == NL80211_BAND_5GHZ)
         lq_sta->last_txrate_idx += IL_FIRST_OFDM_RATE;
     lq_sta->is_agg = 0;
 
 #ifdef CONFIG_MAC80211_DEBUGFS
     lq_sta->dbg_fixed_rate = 0;
 #endif
 
     il4965_rs_initialize_lq(il, conf, sta, lq_sta);
 }
 
 static void
 il4965_rs_fill_link_cmd(struct il_priv *il, struct il_lq_sta *lq_sta,
             u32 new_rate)
 {
     struct il_scale_tbl_info tbl_type;
     int idx = 0;
     int rate_idx;
     int repeat_rate = 0;
     u8 ant_toggle_cnt = 0;
     u8 use_ht_possible = 1;
     u8 valid_tx_ant = 0;
     struct il_link_quality_cmd *lq_cmd = &lq_sta->lq;
 
     /* Override starting rate (idx 0) if needed for debug purposes */
     il4965_rs_dbgfs_set_mcs(lq_sta, &new_rate, idx);
 
     /* Interpret new_rate (rate_n_flags) */
     il4965_rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
                     &rate_idx);
 
     /* How many times should we repeat the initial rate? */
     if (is_legacy(tbl_type.lq_type)) {
         ant_toggle_cnt = 1;
         repeat_rate = IL_NUMBER_TRY;
     } else {
         repeat_rate = IL_HT_NUMBER_TRY;
     }
 
     lq_cmd->general_params.mimo_delimiter =
         is_mimo(tbl_type.lq_type) ? 1 : 0;
 
     /* Fill 1st table entry (idx 0) */
     lq_cmd->rs_table[idx].rate_n_flags = cpu_to_le32(new_rate);
 
     if (il4965_num_of_ant(tbl_type.ant_type) == 1) {
         lq_cmd->general_params.single_stream_ant_msk =
             tbl_type.ant_type;
     } else if (il4965_num_of_ant(tbl_type.ant_type) == 2) {
         lq_cmd->general_params.dual_stream_ant_msk = tbl_type.ant_type;
     }
     /* otherwise we don't modify the existing value */
     idx++;
     repeat_rate--;
     if (il)
         valid_tx_ant = il->hw_params.valid_tx_ant;
 
     /* Fill rest of rate table */
     while (idx < LINK_QUAL_MAX_RETRY_NUM) {
         /* Repeat initial/next rate.
          * For legacy IL_NUMBER_TRY == 1, this loop will not execute.
          * For HT IL_HT_NUMBER_TRY == 3, this executes twice. */
         while (repeat_rate > 0 && idx < (LINK_QUAL_MAX_RETRY_NUM - 1)) {
             if (is_legacy(tbl_type.lq_type)) {
                 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
                     ant_toggle_cnt++;
                 else if (il &&
                      il4965_rs_toggle_antenna(valid_tx_ant,
                                   &new_rate,
                                   &tbl_type))
                     ant_toggle_cnt = 1;
             }
 
             /* Override next rate if needed for debug purposes */
             il4965_rs_dbgfs_set_mcs(lq_sta, &new_rate, idx);
 
             /* Fill next table entry */
             lq_cmd->rs_table[idx].rate_n_flags =
                 cpu_to_le32(new_rate);
             repeat_rate--;
             idx++;
         }
 
         il4965_rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
                         &tbl_type, &rate_idx);
 
         /* Indicate to uCode which entries might be MIMO.
          * If initial rate was MIMO, this will finally end up
          * as (IL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
         if (is_mimo(tbl_type.lq_type))
             lq_cmd->general_params.mimo_delimiter = idx;
 
         /* Get next rate */
         new_rate =
             il4965_rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
                          use_ht_possible);
 
         /* How many times should we repeat the next rate? */
         if (is_legacy(tbl_type.lq_type)) {
             if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
                 ant_toggle_cnt++;
             else if (il &&
                  il4965_rs_toggle_antenna(valid_tx_ant,
                               &new_rate, &tbl_type))
                 ant_toggle_cnt = 1;
 
             repeat_rate = IL_NUMBER_TRY;
         } else {
             repeat_rate = IL_HT_NUMBER_TRY;
         }
 
         /* Don't allow HT rates after next pass.
          * il4965_rs_get_lower_rate() will change type to LQ_A or LQ_G. */
         use_ht_possible = 0;
 
         /* Override next rate if needed for debug purposes */
         il4965_rs_dbgfs_set_mcs(lq_sta, &new_rate, idx);
 
         /* Fill next table entry */
         lq_cmd->rs_table[idx].rate_n_flags = cpu_to_le32(new_rate);
 
         idx++;
         repeat_rate--;
     }
 
     lq_cmd->agg_params.agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
     lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
 
     lq_cmd->agg_params.agg_time_limit =
         cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
 }
 
 static void *
 il4965_rs_alloc(struct ieee80211_hw *hw)
 {
     return hw->priv;
 }
 
 /* rate scale requires free function to be implemented */
 static void
 il4965_rs_free(void *il_rate)
 {
     return;
 }
 
 static void
 il4965_rs_free_sta(void *il_r, struct ieee80211_sta *sta, void *il_sta)
 {
     struct il_priv *il __maybe_unused = il_r;
 
     D_RATE("enter\n");
     D_RATE("leave\n");
 }
 
 #ifdef CONFIG_MAC80211_DEBUGFS
 
 static void
 il4965_rs_dbgfs_set_mcs(struct il_lq_sta *lq_sta, u32 * rate_n_flags, int idx)
 {
     struct il_priv *il;
     u8 valid_tx_ant;
     u8 ant_sel_tx;
 
     il = lq_sta->drv;
     valid_tx_ant = il->hw_params.valid_tx_ant;
     if (lq_sta->dbg_fixed_rate) {
         ant_sel_tx =
             ((lq_sta->
               dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK) >>
              RATE_MCS_ANT_POS);
         if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
             *rate_n_flags = lq_sta->dbg_fixed_rate;
             D_RATE("Fixed rate ON\n");
         } else {
             lq_sta->dbg_fixed_rate = 0;
             IL_ERR
                 ("Invalid antenna selection 0x%X, Valid is 0x%X\n",
                  ant_sel_tx, valid_tx_ant);
             D_RATE("Fixed rate OFF\n");
         }
     } else {
         D_RATE("Fixed rate OFF\n");
     }
 }
 
 static ssize_t
 il4965_rs_sta_dbgfs_scale_table_write(struct file *file,
                       const char __user *user_buf,
                       size_t count, loff_t *ppos)
 {
     struct il_lq_sta *lq_sta = file->private_data;
     struct il_priv *il;
     char buf[64];
     size_t buf_size;
     u32 parsed_rate;
 
     il = lq_sta->drv;
     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)
         lq_sta->dbg_fixed_rate = parsed_rate;
     else
         lq_sta->dbg_fixed_rate = 0;
 
     lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
     lq_sta->active_siso_rate = 0x1FD0;  /* 6 - 60 MBits, no 9, no CCK */
     lq_sta->active_mimo2_rate = 0x1FD0; /* 6 - 60 MBits, no 9, no CCK */
 
     D_RATE("sta_id %d rate 0x%X\n", lq_sta->lq.sta_id,
            lq_sta->dbg_fixed_rate);
 
     if (lq_sta->dbg_fixed_rate) {
         il4965_rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
         il_send_lq_cmd(lq_sta->drv, &lq_sta->lq, CMD_ASYNC, false);
     }
 
     return count;
 }
 
 static ssize_t
 il4965_rs_sta_dbgfs_scale_table_read(struct file *file, char __user *user_buf,
                      size_t count, loff_t *ppos)
 {
     char *buff;
     int desc = 0;
     int i = 0;
     int idx = 0;
     ssize_t ret;
 
     struct il_lq_sta *lq_sta = file->private_data;
     struct il_priv *il;
     struct il_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 
     il = lq_sta->drv;
     buff = kmalloc(1024, GFP_KERNEL);
     if (!buff)
         return -ENOMEM;
 
     desc += sprintf(buff + desc, "sta_id %d\n", lq_sta->lq.sta_id);
     desc +=
         sprintf(buff + desc, "failed=%d success=%d rate=0%X\n",
             lq_sta->total_failed, lq_sta->total_success,
             lq_sta->active_legacy_rate);
     desc +=
         sprintf(buff + desc, "fixed rate 0x%X\n", lq_sta->dbg_fixed_rate);
     desc +=
         sprintf(buff + desc, "valid_tx_ant %s%s%s\n",
             (il->hw_params.valid_tx_ant & ANT_A) ? "ANT_A," : "",
             (il->hw_params.valid_tx_ant & ANT_B) ? "ANT_B," : "",
             (il->hw_params.valid_tx_ant & ANT_C) ? "ANT_C" : "");
     desc +=
         sprintf(buff + desc, "lq type %s\n",
             (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
     if (is_Ht(tbl->lq_type)) {
         desc +=
             sprintf(buff + desc, " %s",
                 (is_siso(tbl->lq_type)) ? "SISO" : "MIMO2");
         desc +=
             sprintf(buff + desc, " %s",
                 (tbl->is_ht40) ? "40MHz" : "20MHz");
         desc +=
             sprintf(buff + desc, " %s %s %s\n",
                 (tbl->is_SGI) ? "SGI" : "",
                 (lq_sta->is_green) ? "GF enabled" : "",
                 (lq_sta->is_agg) ? "AGG on" : "");
     }
     desc +=
         sprintf(buff + desc, "last tx rate=0x%X\n",
             lq_sta->last_rate_n_flags);
     desc +=
         sprintf(buff + desc,
             "general:" "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
             lq_sta->lq.general_params.flags,
             lq_sta->lq.general_params.mimo_delimiter,
             lq_sta->lq.general_params.single_stream_ant_msk,
             lq_sta->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(lq_sta->lq.agg_params.agg_time_limit),
             lq_sta->lq.agg_params.agg_dis_start_th,
             lq_sta->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",
             lq_sta->lq.general_params.start_rate_idx[0],
             lq_sta->lq.general_params.start_rate_idx[1],
             lq_sta->lq.general_params.start_rate_idx[2],
             lq_sta->lq.general_params.start_rate_idx[3]);
 
     for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
         idx =
             il4965_hwrate_to_plcp_idx(le32_to_cpu
                           (lq_sta->lq.rs_table[i].
                            rate_n_flags));
         if (is_legacy(tbl->lq_type)) {
             desc +=
                 sprintf(buff + desc, " rate[%d] 0x%X %smbps\n", i,
                     le32_to_cpu(lq_sta->lq.rs_table[i].
                         rate_n_flags),
                     il_rate_mcs[idx].mbps);
         } else {
             desc +=
                 sprintf(buff + desc, " rate[%d] 0x%X %smbps (%s)\n",
                     i,
                     le32_to_cpu(lq_sta->lq.rs_table[i].
                         rate_n_flags),
                     il_rate_mcs[idx].mbps,
                     il_rate_mcs[idx].mcs);
         }
     }
 
     ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
     kfree(buff);
     return ret;
 }
 
 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
     .write = il4965_rs_sta_dbgfs_scale_table_write,
     .read = il4965_rs_sta_dbgfs_scale_table_read,
     .open = simple_open,
     .llseek = default_llseek,
 };
 
 static ssize_t
 il4965_rs_sta_dbgfs_stats_table_read(struct file *file, char __user *user_buf,
                      size_t count, loff_t *ppos)
 {
     char *buff;
     int desc = 0;
     int i, j;
     ssize_t ret;
 
     struct il_lq_sta *lq_sta = file->private_data;
 
     buff = kmalloc(1024, GFP_KERNEL);
     if (!buff)
         return -ENOMEM;
 
     for (i = 0; i < LQ_SIZE; i++) {
         desc +=
             sprintf(buff + desc,
                 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
                 "rate=0x%X\n", lq_sta->active_tbl == i ? "*" : "x",
                 lq_sta->lq_info[i].lq_type,
                 lq_sta->lq_info[i].is_SGI,
                 lq_sta->lq_info[i].is_ht40,
                 lq_sta->lq_info[i].is_dup, lq_sta->is_green,
                 lq_sta->lq_info[i].current_rate);
         for (j = 0; j < RATE_COUNT; j++) {
             desc +=
                 sprintf(buff + desc,
                     "counter=%d success=%d %%=%d\n",
                     lq_sta->lq_info[i].win[j].counter,
                     lq_sta->lq_info[i].win[j].success_counter,
                     lq_sta->lq_info[i].win[j].success_ratio);
         }
     }
     ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
     kfree(buff);
     return ret;
 }
 
 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
     .read = il4965_rs_sta_dbgfs_stats_table_read,
     .open = simple_open,
     .llseek = default_llseek,
 };
 
 static ssize_t
 il4965_rs_sta_dbgfs_rate_scale_data_read(struct file *file,
                      char __user *user_buf, size_t count,
                      loff_t *ppos)
 {
     char buff[120];
     int desc = 0;
     struct il_lq_sta *lq_sta = file->private_data;
     struct il_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
 
     if (is_Ht(tbl->lq_type))
         desc +=
             sprintf(buff + desc, "Bit Rate= %d Mb/s\n",
                 tbl->expected_tpt[lq_sta->last_txrate_idx]);
     else
         desc +=
             sprintf(buff + desc, "Bit Rate= %d Mb/s\n",
                 il_rates[lq_sta->last_txrate_idx].ieee >> 1);
 
     return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
 }
 
 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
     .read = il4965_rs_sta_dbgfs_rate_scale_data_read,
     .open = simple_open,
     .llseek = default_llseek,
 };
 
 static void
 il4965_rs_add_debugfs(void *il, void *il_sta, struct dentry *dir)
 {
     struct il_lq_sta *lq_sta = il_sta;
 
     debugfs_create_file("rate_scale_table", 0600, dir, lq_sta,
                 &rs_sta_dbgfs_scale_table_ops);
     debugfs_create_file("rate_stats_table", 0400, dir, lq_sta,
                 &rs_sta_dbgfs_stats_table_ops);
     debugfs_create_file("rate_scale_data", 0400, dir, lq_sta,
                 &rs_sta_dbgfs_rate_scale_data_ops);
     debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
               &lq_sta->tx_agg_tid_en);
 }
 #endif
 
 /*
  * Initialization of rate scaling information is done by driver after
  * the station is added. Since mac80211 calls this function before a
  * station is added we ignore it.
  */
 static void
 il4965_rs_rate_init_stub(void *il_r, struct ieee80211_supported_band *sband,
              struct cfg80211_chan_def *chandef,
              struct ieee80211_sta *sta, void *il_sta)
 {
 }
 
 static const struct rate_control_ops rs_4965_ops = {
     .name = IL4965_RS_NAME,
     .tx_status = il4965_rs_tx_status,
     .get_rate = il4965_rs_get_rate,
     .rate_init = il4965_rs_rate_init_stub,
     .alloc = il4965_rs_alloc,
     .free = il4965_rs_free,
     .alloc_sta = il4965_rs_alloc_sta,
     .free_sta = il4965_rs_free_sta,
 #ifdef CONFIG_MAC80211_DEBUGFS
     .add_sta_debugfs = il4965_rs_add_debugfs,
 #endif
 };
 
 int
 il4965_rate_control_register(void)
 {
     return ieee80211_rate_control_register(&rs_4965_ops);
 }
 
 void
 il4965_rate_control_unregister(void)
 {
     ieee80211_rate_control_unregister(&rs_4965_ops);
 }