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

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2005 - 2011 Intel Corporation. All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of version 2 of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  17  *
  18  * The full GNU General Public License is included in this distribution in the
  19  * file called LICENSE.
  20  *
  21  * Contact Information:
  22  *  Intel Linux Wireless <ilw@linux.intel.com>
  23  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  24  *
  25  *****************************************************************************/
  26 #include <linux/kernel.h>
  27 #include <linux/init.h>
  28 #include <linux/skbuff.h>
  29 #include <linux/slab.h>
  30 #include <linux/wireless.h>
  31 #include <net/mac80211.h>
  32
  33 #include <linux/netdevice.h>
  34 #include <linux/etherdevice.h>
  35 #include <linux/delay.h>
  36
  37 #include <linux/workqueue.h>
  38
  39 #include "iwl-dev.h"
  40 #include "iwl-sta.h"
  41 #include "iwl-core.h"
  42 #include "iwl-agn.h"
  43
  44 #define RS_NAME "iwl-agn-rs"
  45
  46 #define NUM_TRY_BEFORE_ANT_TOGGLE 1
  47 #define IWL_NUMBER_TRY      1
  48 #define IWL_HT_NUMBER_TRY   3
  49
  50 #define IWL_RATE_MAX_WINDOW             62      /* # tx in history window */
  51 #define IWL_RATE_MIN_FAILURE_TH         6       /* min failures to calc tpt */
  52 #define IWL_RATE_MIN_SUCCESS_TH         8       /* min successes to calc tpt */
  53
  54 /* max allowed rate miss before sync LQ cmd */
  55 #define IWL_MISSED_RATE_MAX             15
  56 /* max time to accum history 2 seconds */
  57 #define IWL_RATE_SCALE_FLUSH_INTVL   (3*HZ)
  58
  59 static u8 rs_ht_to_legacy[] = {
  60         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
  61         IWL_RATE_6M_INDEX, IWL_RATE_6M_INDEX,
  62         IWL_RATE_6M_INDEX,
  63         IWL_RATE_6M_INDEX, IWL_RATE_9M_INDEX,
  64         IWL_RATE_12M_INDEX, IWL_RATE_18M_INDEX,
  65         IWL_RATE_24M_INDEX, IWL_RATE_36M_INDEX,
  66         IWL_RATE_48M_INDEX, IWL_RATE_54M_INDEX
  67 };
  68
  69 static const u8 ant_toggle_lookup[] = {
  70         /*ANT_NONE -> */ ANT_NONE,
  71         /*ANT_A    -> */ ANT_B,
  72         /*ANT_B    -> */ ANT_C,
  73         /*ANT_AB   -> */ ANT_BC,
  74         /*ANT_C    -> */ ANT_A,
  75         /*ANT_AC   -> */ ANT_AB,
  76         /*ANT_BC   -> */ ANT_AC,
  77         /*ANT_ABC  -> */ ANT_ABC,
  78 };
  79
  80 #define IWL_DECLARE_RATE_INFO(r, s, ip, in, rp, rn, pp, np)    \
  81         [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP,      \
  82                                     IWL_RATE_SISO_##s##M_PLCP, \
  83                                     IWL_RATE_MIMO2_##s##M_PLCP,\
  84                                     IWL_RATE_MIMO3_##s##M_PLCP,\
  85                                     IWL_RATE_##r##M_IEEE,      \
  86                                     IWL_RATE_##ip##M_INDEX,    \
  87                                     IWL_RATE_##in##M_INDEX,    \
  88                                     IWL_RATE_##rp##M_INDEX,    \
  89                                     IWL_RATE_##rn##M_INDEX,    \
  90                                     IWL_RATE_##pp##M_INDEX,    \
  91                                     IWL_RATE_##np##M_INDEX }
  92
  93 /*
  94  * Parameter order:
  95  *   rate, ht rate, prev rate, next rate, prev tgg rate, next tgg rate
  96  *
  97  * If there isn't a valid next or previous rate then INV is used which
  98  * maps to IWL_RATE_INVALID
  99  *
 100  */
 101 const struct iwl_rate_info iwl_rates[IWL_RATE_COUNT] = {
 102         IWL_DECLARE_RATE_INFO(1, INV, INV, 2, INV, 2, INV, 2),    /*  1mbps */
 103         IWL_DECLARE_RATE_INFO(2, INV, 1, 5, 1, 5, 1, 5),          /*  2mbps */
 104         IWL_DECLARE_RATE_INFO(5, INV, 2, 6, 2, 11, 2, 11),        /*5.5mbps */
 105         IWL_DECLARE_RATE_INFO(11, INV, 9, 12, 9, 12, 5, 18),      /* 11mbps */
 106         IWL_DECLARE_RATE_INFO(6, 6, 5, 9, 5, 11, 5, 11),        /*  6mbps */
 107         IWL_DECLARE_RATE_INFO(9, 6, 6, 11, 6, 11, 5, 11),       /*  9mbps */
 108         IWL_DECLARE_RATE_INFO(12, 12, 11, 18, 11, 18, 11, 18),   /* 12mbps */
 109         IWL_DECLARE_RATE_INFO(18, 18, 12, 24, 12, 24, 11, 24),   /* 18mbps */
 110         IWL_DECLARE_RATE_INFO(24, 24, 18, 36, 18, 36, 18, 36),   /* 24mbps */
 111         IWL_DECLARE_RATE_INFO(36, 36, 24, 48, 24, 48, 24, 48),   /* 36mbps */
 112         IWL_DECLARE_RATE_INFO(48, 48, 36, 54, 36, 54, 36, 54),   /* 48mbps */
 113         IWL_DECLARE_RATE_INFO(54, 54, 48, INV, 48, INV, 48, INV),/* 54mbps */
 114         IWL_DECLARE_RATE_INFO(60, 60, 48, INV, 48, INV, 48, INV),/* 60mbps */
 115         /* FIXME:RS:          ^^    should be INV (legacy) */
 116 };
 117
 118 static inline u8 rs_extract_rate(u32 rate_n_flags)
 119 {
 120         return (u8)(rate_n_flags & RATE_MCS_RATE_MSK);
 121 }
 122
 123 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
 124 {
 125         int idx = 0;
 126
 127         /* HT rate format */
 128         if (rate_n_flags & RATE_MCS_HT_MSK) {
 129                 idx = rs_extract_rate(rate_n_flags);
 130
 131                 if (idx >= IWL_RATE_MIMO3_6M_PLCP)
 132                         idx = idx - IWL_RATE_MIMO3_6M_PLCP;
 133                 else if (idx >= IWL_RATE_MIMO2_6M_PLCP)
 134                         idx = idx - IWL_RATE_MIMO2_6M_PLCP;
 135
 136                 idx += IWL_FIRST_OFDM_RATE;
 137                 /* skip 9M not supported in ht*/
 138                 if (idx >= IWL_RATE_9M_INDEX)
 139                         idx += 1;
 140                 if ((idx >= IWL_FIRST_OFDM_RATE) && (idx <= IWL_LAST_OFDM_RATE))
 141                         return idx;
 142
 143         /* legacy rate format, search for match in table */
 144         } else {
 145                 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
 146                         if (iwl_rates[idx].plcp ==
 147                                         rs_extract_rate(rate_n_flags))
 148                                 return idx;
 149         }
 150
 151         return -1;
 152 }
 153
 154 static void rs_rate_scale_perform(struct iwl_priv *priv,
 155                                    struct sk_buff *skb,
 156                                    struct ieee80211_sta *sta,
 157                                    struct iwl_lq_sta *lq_sta);
 158 static void rs_fill_link_cmd(struct iwl_priv *priv,
 159                              struct iwl_lq_sta *lq_sta, u32 rate_n_flags);
 160 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
 161
 162
 163 #ifdef CONFIG_MAC80211_DEBUGFS
 164 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
 165                              u32 *rate_n_flags, int index);
 166 #else
 167 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
 168                              u32 *rate_n_flags, int index)
 169 {}
 170 #endif
 171
 172 /**
 173  * The following tables contain the expected throughput metrics for all rates
 174  *
 175  *      1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 176  *
 177  * where invalid entries are zeros.
 178  *
 179  * CCK rates are only valid in legacy table and will only be used in G
 180  * (2.4 GHz) band.
 181  */
 182
 183 static s32 expected_tpt_legacy[IWL_RATE_COUNT] = {
 184         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0
 185 };
 186
 187 static s32 expected_tpt_siso20MHz[4][IWL_RATE_COUNT] = {
 188         {0, 0, 0, 0, 42, 0,  76, 102, 124, 159, 183, 193, 202}, /* Norm */
 189         {0, 0, 0, 0, 46, 0,  82, 110, 132, 168, 192, 202, 210}, /* SGI */
 190         {0, 0, 0, 0, 47, 0,  91, 133, 171, 242, 305, 334, 362}, /* AGG */
 191         {0, 0, 0, 0, 52, 0, 101, 145, 187, 264, 330, 361, 390}, /* AGG+SGI */
 192 };
 193
 194 static s32 expected_tpt_siso40MHz[4][IWL_RATE_COUNT] = {
 195         {0, 0, 0, 0,  77, 0, 127, 160, 184, 220, 242, 250, 257}, /* Norm */
 196         {0, 0, 0, 0,  83, 0, 135, 169, 193, 229, 250, 257, 264}, /* SGI */
 197         {0, 0, 0, 0,  94, 0, 177, 249, 313, 423, 512, 550, 586}, /* AGG */
 198         {0, 0, 0, 0, 104, 0, 193, 270, 338, 454, 545, 584, 620}, /* AGG+SGI */
 199 };
 200
 201 static s32 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
 202         {0, 0, 0, 0,  74, 0, 123, 155, 179, 214, 236, 244, 251}, /* Norm */
 203         {0, 0, 0, 0,  81, 0, 131, 164, 188, 223, 243, 251, 257}, /* SGI */
 204         {0, 0, 0, 0,  89, 0, 167, 235, 296, 402, 488, 526, 560}, /* AGG */
 205         {0, 0, 0, 0,  97, 0, 182, 255, 320, 431, 520, 558, 593}, /* AGG+SGI*/
 206 };
 207
 208 static s32 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
 209         {0, 0, 0, 0, 123, 0, 182, 214, 235, 264, 279, 285, 289}, /* Norm */
 210         {0, 0, 0, 0, 131, 0, 191, 222, 242, 270, 284, 289, 293}, /* SGI */
 211         {0, 0, 0, 0, 171, 0, 305, 410, 496, 634, 731, 771, 805}, /* AGG */
 212         {0, 0, 0, 0, 186, 0, 329, 439, 527, 667, 764, 803, 838}, /* AGG+SGI */
 213 };
 214
 215 static s32 expected_tpt_mimo3_20MHz[4][IWL_RATE_COUNT] = {
 216         {0, 0, 0, 0,  99, 0, 153, 186, 208, 239, 256, 263, 268}, /* Norm */
 217         {0, 0, 0, 0, 106, 0, 162, 194, 215, 246, 262, 268, 273}, /* SGI */
 218         {0, 0, 0, 0, 134, 0, 249, 346, 431, 574, 685, 732, 775}, /* AGG */
 219         {0, 0, 0, 0, 148, 0, 272, 376, 465, 614, 727, 775, 818}, /* AGG+SGI */
 220 };
 221
 222 static s32 expected_tpt_mimo3_40MHz[4][IWL_RATE_COUNT] = {
 223         {0, 0, 0, 0, 152, 0, 211, 239, 255, 279,  290,  294,  297}, /* Norm */
 224         {0, 0, 0, 0, 160, 0, 219, 245, 261, 284,  294,  297,  300}, /* SGI */
 225         {0, 0, 0, 0, 254, 0, 443, 584, 695, 868,  984, 1030, 1070}, /* AGG */
 226         {0, 0, 0, 0, 277, 0, 478, 624, 737, 911, 1026, 1070, 1109}, /* AGG+SGI */
 227 };
 228
 229 /* mbps, mcs */
 230 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
 231         {  "1", "BPSK DSSS"},
 232         {  "2", "QPSK DSSS"},
 233         {"5.5", "BPSK CCK"},
 234         { "11", "QPSK CCK"},
 235         {  "6", "BPSK 1/2"},
 236         {  "9", "BPSK 1/2"},
 237         { "12", "QPSK 1/2"},
 238         { "18", "QPSK 3/4"},
 239         { "24", "16QAM 1/2"},
 240         { "36", "16QAM 3/4"},
 241         { "48", "64QAM 2/3"},
 242         { "54", "64QAM 3/4"},
 243         { "60", "64QAM 5/6"},
 244 };
 245
 246 #define MCS_INDEX_PER_STREAM    (8)
 247
 248 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
 249 {
 250         window->data = 0;
 251         window->success_counter = 0;
 252         window->success_ratio = IWL_INVALID_VALUE;
 253         window->counter = 0;
 254         window->average_tpt = IWL_INVALID_VALUE;
 255         window->stamp = 0;
 256 }
 257
 258 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 259 {
 260         return (ant_type & valid_antenna) == ant_type;
 261 }
 262
 263 /*
 264  *      removes the old data from the statistics. All data that is older than
 265  *      TID_MAX_TIME_DIFF, will be deleted.
 266  */
 267 static void rs_tl_rm_old_stats(struct iwl_traffic_load *tl, u32 curr_time)
 268 {
 269         /* The oldest age we want to keep */
 270         u32 oldest_time = curr_time - TID_MAX_TIME_DIFF;
 271
 272         while (tl->queue_count &&
 273                (tl->time_stamp < oldest_time)) {
 274                 tl->total -= tl->packet_count[tl->head];
 275                 tl->packet_count[tl->head] = 0;
 276                 tl->time_stamp += TID_QUEUE_CELL_SPACING;
 277                 tl->queue_count--;
 278                 tl->head++;
 279                 if (tl->head >= TID_QUEUE_MAX_SIZE)
 280                         tl->head = 0;
 281         }
 282 }
 283
 284 /*
 285  *      increment traffic load value for tid and also remove
 286  *      any old values if passed the certain time period
 287  */
 288 static u8 rs_tl_add_packet(struct iwl_lq_sta *lq_data,
 289                            struct ieee80211_hdr *hdr)
 290 {
 291         u32 curr_time = jiffies_to_msecs(jiffies);
 292         u32 time_diff;
 293         s32 index;
 294         struct iwl_traffic_load *tl = NULL;
 295         u8 tid;
 296
 297         if (ieee80211_is_data_qos(hdr->frame_control)) {
 298                 u8 *qc = ieee80211_get_qos_ctl(hdr);
 299                 tid = qc[0] & 0xf;
 300         } else
 301                 return MAX_TID_COUNT;
 302
 303         if (unlikely(tid >= TID_MAX_LOAD_COUNT))
 304                 return MAX_TID_COUNT;
 305
 306         tl = &lq_data->load[tid];
 307
 308         curr_time -= curr_time % TID_ROUND_VALUE;
 309
 310         /* Happens only for the first packet. Initialize the data */
 311         if (!(tl->queue_count)) {
 312                 tl->total = 1;
 313                 tl->time_stamp = curr_time;
 314                 tl->queue_count = 1;
 315                 tl->head = 0;
 316                 tl->packet_count[0] = 1;
 317                 return MAX_TID_COUNT;
 318         }
 319
 320         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 321         index = time_diff / TID_QUEUE_CELL_SPACING;
 322
 323         /* The history is too long: remove data that is older than */
 324         /* TID_MAX_TIME_DIFF */
 325         if (index >= TID_QUEUE_MAX_SIZE)
 326                 rs_tl_rm_old_stats(tl, curr_time);
 327
 328         index = (tl->head + index) % TID_QUEUE_MAX_SIZE;
 329         tl->packet_count[index] = tl->packet_count[index] + 1;
 330         tl->total = tl->total + 1;
 331
 332         if ((index + 1) > tl->queue_count)
 333                 tl->queue_count = index + 1;
 334
 335         return tid;
 336 }
 337
 338 #ifdef CONFIG_MAC80211_DEBUGFS
 339 /**
 340  * Program the device to use fixed rate for frame transmit
 341  * This is for debugging/testing only
 342  * once the device start use fixed rate, we need to reload the module
 343  * to being back the normal operation.
 344  */
 345 static void rs_program_fix_rate(struct iwl_priv *priv,
 346                                 struct iwl_lq_sta *lq_sta)
 347 {
 348         struct iwl_station_priv *sta_priv =
 349                 container_of(lq_sta, struct iwl_station_priv, lq_sta);
 350         struct iwl_rxon_context *ctx = sta_priv->common.ctx;
 351
 352         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
 353         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
 354         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
 355         lq_sta->active_mimo3_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
 356
 357 #ifdef CONFIG_IWLWIFI_DEVICE_SVTOOL
 358         /* testmode has higher priority to overwirte the fixed rate */
 359         if (priv->tm_fixed_rate)
 360                 lq_sta->dbg_fixed_rate = priv->tm_fixed_rate;
 361 #endif
 362
 363         IWL_DEBUG_RATE(priv, "sta_id %d rate 0x%X\n",
 364                 lq_sta->lq.sta_id, lq_sta->dbg_fixed_rate);
 365
 366         if (lq_sta->dbg_fixed_rate) {
 367                 rs_fill_link_cmd(NULL, lq_sta, lq_sta->dbg_fixed_rate);
 368                 iwl_send_lq_cmd(lq_sta->drv, ctx, &lq_sta->lq, CMD_ASYNC,
 369                                 false);
 370         }
 371 }
 372 #endif
 373
 374 /*
 375         get the traffic load value for tid
 376 */
 377 static u32 rs_tl_get_load(struct iwl_lq_sta *lq_data, u8 tid)
 378 {
 379         u32 curr_time = jiffies_to_msecs(jiffies);
 380         u32 time_diff;
 381         s32 index;
 382         struct iwl_traffic_load *tl = NULL;
 383
 384         if (tid >= TID_MAX_LOAD_COUNT)
 385                 return 0;
 386
 387         tl = &(lq_data->load[tid]);
 388
 389         curr_time -= curr_time % TID_ROUND_VALUE;
 390
 391         if (!(tl->queue_count))
 392                 return 0;
 393
 394         time_diff = TIME_WRAP_AROUND(tl->time_stamp, curr_time);
 395         index = time_diff / TID_QUEUE_CELL_SPACING;
 396
 397         /* The history is too long: remove data that is older than */
 398         /* TID_MAX_TIME_DIFF */
 399         if (index >= TID_QUEUE_MAX_SIZE)
 400                 rs_tl_rm_old_stats(tl, curr_time);
 401
 402         return tl->total;
 403 }
 404
 405 static int rs_tl_turn_on_agg_for_tid(struct iwl_priv *priv,
 406                                       struct iwl_lq_sta *lq_data, u8 tid,
 407                                       struct ieee80211_sta *sta)
 408 {
 409         int ret = -EAGAIN;
 410         u32 load;
 411
 412         /*
 413          * Don't create TX aggregation sessions when in high
 414          * BT traffic, as they would just be disrupted by BT.
 415          */
 416         if (priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) {
 417                 IWL_ERR(priv, "BT traffic (%d), no aggregation allowed\n",
 418                         priv->bt_traffic_load);
 419                 return ret;
 420         }
 421
 422         load = rs_tl_get_load(lq_data, tid);
 423
 424         if (load > IWL_AGG_LOAD_THRESHOLD) {
 425                 IWL_DEBUG_HT(priv, "Starting Tx agg: STA: %pM tid: %d\n",
 426                                 sta->addr, tid);
 427                 ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
 428                 if (ret == -EAGAIN) {
 429                         /*
 430                          * driver and mac80211 is out of sync
 431                          * this might be cause by reloading firmware
 432                          * stop the tx ba session here
 433                          */
 434                         IWL_ERR(priv, "Fail start Tx agg on tid: %d\n",
 435                                 tid);
 436                         ieee80211_stop_tx_ba_session(sta, tid);
 437                 }
 438         } else {
 439                 IWL_DEBUG_HT(priv, "Aggregation not enabled for tid %d "
 440                         "because load = %u\n", tid, load);
 441         }
 442         return ret;
 443 }
 444
 445 static void rs_tl_turn_on_agg(struct iwl_priv *priv, u8 tid,
 446                               struct iwl_lq_sta *lq_data,
 447                               struct ieee80211_sta *sta)
 448 {
 449         if (tid < TID_MAX_LOAD_COUNT)
 450                 rs_tl_turn_on_agg_for_tid(priv, lq_data, tid, sta);
 451         else
 452                 IWL_ERR(priv, "tid exceeds max load count: %d/%d\n",
 453                         tid, TID_MAX_LOAD_COUNT);
 454 }
 455
 456 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
 457 {
 458         return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 459                !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 460                !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
 461 }
 462
 463 /*
 464  * Static function to get the expected throughput from an iwl_scale_tbl_info
 465  * that wraps a NULL pointer check
 466  */
 467 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
 468 {
 469         if (tbl->expected_tpt)
 470                 return tbl->expected_tpt[rs_index];
 471         return 0;
 472 }
 473
 474 /**
 475  * rs_collect_tx_data - Update the success/failure sliding window
 476  *
 477  * We keep a sliding window of the last 62 packets transmitted
 478  * at this rate.  window->data contains the bitmask of successful
 479  * packets.
 480  */
 481 static int rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
 482                               int scale_index, int attempts, int successes)
 483 {
 484         struct iwl_rate_scale_data *window = NULL;
 485         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
 486         s32 fail_count, tpt;
 487
 488         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 489                 return -EINVAL;
 490
 491         /* Select window for current tx bit rate */
 492         window = &(tbl->win[scale_index]);
 493
 494         /* Get expected throughput */
 495         tpt = get_expected_tpt(tbl, scale_index);
 496
 497         /*
 498          * Keep track of only the latest 62 tx frame attempts in this rate's
 499          * history window; anything older isn't really relevant any more.
 500          * If we have filled up the sliding window, drop the oldest attempt;
 501          * if the oldest attempt (highest bit in bitmap) shows "success",
 502          * subtract "1" from the success counter (this is the main reason
 503          * we keep these bitmaps!).
 504          */
 505         while (attempts > 0) {
 506                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
 507
 508                         /* remove earliest */
 509                         window->counter = IWL_RATE_MAX_WINDOW - 1;
 510
 511                         if (window->data & mask) {
 512                                 window->data &= ~mask;
 513                                 window->success_counter--;
 514                         }
 515                 }
 516
 517                 /* Increment frames-attempted counter */
 518                 window->counter++;
 519
 520                 /* Shift bitmap by one frame to throw away oldest history */
 521                 window->data <<= 1;
 522
 523                 /* Mark the most recent #successes attempts as successful */
 524                 if (successes > 0) {
 525                         window->success_counter++;
 526                         window->data |= 0x1;
 527                         successes--;
 528                 }
 529
 530                 attempts--;
 531         }
 532
 533         /* Calculate current success ratio, avoid divide-by-0! */
 534         if (window->counter > 0)
 535                 window->success_ratio = 128 * (100 * window->success_counter)
 536                                         / window->counter;
 537         else
 538                 window->success_ratio = IWL_INVALID_VALUE;
 539
 540         fail_count = window->counter - window->success_counter;
 541
 542         /* Calculate average throughput, if we have enough history. */
 543         if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
 544             (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
 545                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 546         else
 547                 window->average_tpt = IWL_INVALID_VALUE;
 548
 549         /* Tag this window as having been updated */
 550         window->stamp = jiffies;
 551
 552         return 0;
 553 }
 554
 555 /*
 556  * Fill uCode API rate_n_flags field, based on "search" or "active" table.
 557  */
 558 /* FIXME:RS:remove this function and put the flags statically in the table */
 559 static u32 rate_n_flags_from_tbl(struct iwl_priv *priv,
 560                                  struct iwl_scale_tbl_info *tbl,
 561                                  int index, u8 use_green)
 562 {
 563         u32 rate_n_flags = 0;
 564
 565         if (is_legacy(tbl->lq_type)) {
 566                 rate_n_flags = iwl_rates[index].plcp;
 567                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 568                         rate_n_flags |= RATE_MCS_CCK_MSK;
 569
 570         } else if (is_Ht(tbl->lq_type)) {
 571                 if (index > IWL_LAST_OFDM_RATE) {
 572                         IWL_ERR(priv, "Invalid HT rate index %d\n", index);
 573                         index = IWL_LAST_OFDM_RATE;
 574                 }
 575                 rate_n_flags = RATE_MCS_HT_MSK;
 576
 577                 if (is_siso(tbl->lq_type))
 578                         rate_n_flags |= iwl_rates[index].plcp_siso;
 579                 else if (is_mimo2(tbl->lq_type))
 580                         rate_n_flags |= iwl_rates[index].plcp_mimo2;
 581                 else
 582                         rate_n_flags |= iwl_rates[index].plcp_mimo3;
 583         } else {
 584                 IWL_ERR(priv, "Invalid tbl->lq_type %d\n", tbl->lq_type);
 585         }
 586
 587         rate_n_flags |= ((tbl->ant_type << RATE_MCS_ANT_POS) &
 588                                                      RATE_MCS_ANT_ABC_MSK);
 589
 590         if (is_Ht(tbl->lq_type)) {
 591                 if (tbl->is_ht40) {
 592                         if (tbl->is_dup)
 593                                 rate_n_flags |= RATE_MCS_DUP_MSK;
 594                         else
 595                                 rate_n_flags |= RATE_MCS_HT40_MSK;
 596                 }
 597                 if (tbl->is_SGI)
 598                         rate_n_flags |= RATE_MCS_SGI_MSK;
 599
 600                 if (use_green) {
 601                         rate_n_flags |= RATE_MCS_GF_MSK;
 602                         if (is_siso(tbl->lq_type) && tbl->is_SGI) {
 603                                 rate_n_flags &= ~RATE_MCS_SGI_MSK;
 604                                 IWL_ERR(priv, "GF was set with SGI:SISO\n");
 605                         }
 606                 }
 607         }
 608         return rate_n_flags;
 609 }
 610
 611 /*
 612  * Interpret uCode API's rate_n_flags format,
 613  * fill "search" or "active" tx mode table.
 614  */
 615 static int rs_get_tbl_info_from_mcs(const u32 rate_n_flags,
 616                                     enum ieee80211_band band,
 617                                     struct iwl_scale_tbl_info *tbl,
 618                                     int *rate_idx)
 619 {
 620         u32 ant_msk = (rate_n_flags & RATE_MCS_ANT_ABC_MSK);
 621         u8 num_of_ant = get_num_of_ant_from_rate(rate_n_flags);
 622         u8 mcs;
 623
 624         memset(tbl, 0, sizeof(struct iwl_scale_tbl_info));
 625         *rate_idx = iwl_hwrate_to_plcp_idx(rate_n_flags);
 626
 627         if (*rate_idx  == IWL_RATE_INVALID) {
 628                 *rate_idx = -1;
 629                 return -EINVAL;
 630         }
 631         tbl->is_SGI = 0;        /* default legacy setup */
 632         tbl->is_ht40 = 0;
 633         tbl->is_dup = 0;
 634         tbl->ant_type = (ant_msk >> RATE_MCS_ANT_POS);
 635         tbl->lq_type = LQ_NONE;
 636         tbl->max_search = IWL_MAX_SEARCH;
 637
 638         /* legacy rate format */
 639         if (!(rate_n_flags & RATE_MCS_HT_MSK)) {
 640                 if (num_of_ant == 1) {
 641                         if (band == IEEE80211_BAND_5GHZ)
 642                                 tbl->lq_type = LQ_A;
 643                         else
 644                                 tbl->lq_type = LQ_G;
 645                 }
 646         /* HT rate format */
 647         } else {
 648                 if (rate_n_flags & RATE_MCS_SGI_MSK)
 649                         tbl->is_SGI = 1;
 650
 651                 if ((rate_n_flags & RATE_MCS_HT40_MSK) ||
 652                     (rate_n_flags & RATE_MCS_DUP_MSK))
 653                         tbl->is_ht40 = 1;
 654
 655                 if (rate_n_flags & RATE_MCS_DUP_MSK)
 656                         tbl->is_dup = 1;
 657
 658                 mcs = rs_extract_rate(rate_n_flags);
 659
 660                 /* SISO */
 661                 if (mcs <= IWL_RATE_SISO_60M_PLCP) {
 662                         if (num_of_ant == 1)
 663                                 tbl->lq_type = LQ_SISO; /*else NONE*/
 664                 /* MIMO2 */
 665                 } else if (mcs <= IWL_RATE_MIMO2_60M_PLCP) {
 666                         if (num_of_ant == 2)
 667                                 tbl->lq_type = LQ_MIMO2;
 668                 /* MIMO3 */
 669                 } else {
 670                         if (num_of_ant == 3) {
 671                                 tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
 672                                 tbl->lq_type = LQ_MIMO3;
 673                         }
 674                 }
 675         }
 676         return 0;
 677 }
 678
 679 /* switch to another antenna/antennas and return 1 */
 680 /* if no other valid antenna found, return 0 */
 681 static int rs_toggle_antenna(u32 valid_ant, u32 *rate_n_flags,
 682                              struct iwl_scale_tbl_info *tbl)
 683 {
 684         u8 new_ant_type;
 685
 686         if (!tbl->ant_type || tbl->ant_type > ANT_ABC)
 687                 return 0;
 688
 689         if (!rs_is_valid_ant(valid_ant, tbl->ant_type))
 690                 return 0;
 691
 692         new_ant_type = ant_toggle_lookup[tbl->ant_type];
 693
 694         while ((new_ant_type != tbl->ant_type) &&
 695                !rs_is_valid_ant(valid_ant, new_ant_type))
 696                 new_ant_type = ant_toggle_lookup[new_ant_type];
 697
 698         if (new_ant_type == tbl->ant_type)
 699                 return 0;
 700
 701         tbl->ant_type = new_ant_type;
 702         *rate_n_flags &= ~RATE_MCS_ANT_ABC_MSK;
 703         *rate_n_flags |= new_ant_type << RATE_MCS_ANT_POS;
 704         return 1;
 705 }
 706
 707 /**
 708  * Green-field mode is valid if the station supports it and
 709  * there are no non-GF stations present in the BSS.
 710  */
 711 static bool rs_use_green(struct ieee80211_sta *sta)
 712 {
 713         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
 714         struct iwl_rxon_context *ctx = sta_priv->common.ctx;
 715
 716         return (sta->ht_cap.cap & IEEE80211_HT_CAP_GRN_FLD) &&
 717                 !(ctx->ht.non_gf_sta_present);
 718 }
 719
 720 /**
 721  * rs_get_supported_rates - get the available rates
 722  *
 723  * if management frame or broadcast frame only return
 724  * basic available rates.
 725  *
 726  */
 727 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
 728                                   struct ieee80211_hdr *hdr,
 729                                   enum iwl_table_type rate_type)
 730 {
 731         if (is_legacy(rate_type)) {
 732                 return lq_sta->active_legacy_rate;
 733         } else {
 734                 if (is_siso(rate_type))
 735                         return lq_sta->active_siso_rate;
 736                 else if (is_mimo2(rate_type))
 737                         return lq_sta->active_mimo2_rate;
 738                 else
 739                         return lq_sta->active_mimo3_rate;
 740         }
 741 }
 742
 743 static u16 rs_get_adjacent_rate(struct iwl_priv *priv, u8 index, u16 rate_mask,
 744                                 int rate_type)
 745 {
 746         u8 high = IWL_RATE_INVALID;
 747         u8 low = IWL_RATE_INVALID;
 748
 749         /* 802.11A or ht walks to the next literal adjacent rate in
 750          * the rate table */
 751         if (is_a_band(rate_type) || !is_legacy(rate_type)) {
 752                 int i;
 753                 u32 mask;
 754
 755                 /* Find the previous rate that is in the rate mask */
 756                 i = index - 1;
 757                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 758                         if (rate_mask & mask) {
 759                                 low = i;
 760                                 break;
 761                         }
 762                 }
 763
 764                 /* Find the next rate that is in the rate mask */
 765                 i = index + 1;
 766                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 767                         if (rate_mask & mask) {
 768                                 high = i;
 769                                 break;
 770                         }
 771                 }
 772
 773                 return (high << 8) | low;
 774         }
 775
 776         low = index;
 777         while (low != IWL_RATE_INVALID) {
 778                 low = iwl_rates[low].prev_rs;
 779                 if (low == IWL_RATE_INVALID)
 780                         break;
 781                 if (rate_mask & (1 << low))
 782                         break;
 783                 IWL_DEBUG_RATE(priv, "Skipping masked lower rate: %d\n", low);
 784         }
 785
 786         high = index;
 787         while (high != IWL_RATE_INVALID) {
 788                 high = iwl_rates[high].next_rs;
 789                 if (high == IWL_RATE_INVALID)
 790                         break;
 791                 if (rate_mask & (1 << high))
 792                         break;
 793                 IWL_DEBUG_RATE(priv, "Skipping masked higher rate: %d\n", high);
 794         }
 795
 796         return (high << 8) | low;
 797 }
 798
 799 static u32 rs_get_lower_rate(struct iwl_lq_sta *lq_sta,
 800                              struct iwl_scale_tbl_info *tbl,
 801                              u8 scale_index, u8 ht_possible)
 802 {
 803         s32 low;
 804         u16 rate_mask;
 805         u16 high_low;
 806         u8 switch_to_legacy = 0;
 807         u8 is_green = lq_sta->is_green;
 808         struct iwl_priv *priv = lq_sta->drv;
 809
 810         /* check if we need to switch from HT to legacy rates.
 811          * assumption is that mandatory rates (1Mbps or 6Mbps)
 812          * are always supported (spec demand) */
 813         if (!is_legacy(tbl->lq_type) && (!ht_possible || !scale_index)) {
 814                 switch_to_legacy = 1;
 815                 scale_index = rs_ht_to_legacy[scale_index];
 816                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 817                         tbl->lq_type = LQ_A;
 818                 else
 819                         tbl->lq_type = LQ_G;
 820
 821                 if (num_of_ant(tbl->ant_type) > 1)
 822                         tbl->ant_type =
 823                                 first_antenna(priv->hw_params.valid_tx_ant);
 824
 825                 tbl->is_ht40 = 0;
 826                 tbl->is_SGI = 0;
 827                 tbl->max_search = IWL_MAX_SEARCH;
 828         }
 829
 830         rate_mask = rs_get_supported_rates(lq_sta, NULL, tbl->lq_type);
 831
 832         /* Mask with station rate restriction */
 833         if (is_legacy(tbl->lq_type)) {
 834                 /* supp_rates has no CCK bits in A mode */
 835                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 836                         rate_mask  = (u16)(rate_mask &
 837                            (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
 838                 else
 839                         rate_mask = (u16)(rate_mask & lq_sta->supp_rates);
 840         }
 841
 842         /* If we switched from HT to legacy, check current rate */
 843         if (switch_to_legacy && (rate_mask & (1 << scale_index))) {
 844                 low = scale_index;
 845                 goto out;
 846         }
 847
 848         high_low = rs_get_adjacent_rate(lq_sta->drv, scale_index, rate_mask,
 849                                         tbl->lq_type);
 850         low = high_low & 0xff;
 851
 852         if (low == IWL_RATE_INVALID)
 853                 low = scale_index;
 854
 855 out:
 856         return rate_n_flags_from_tbl(lq_sta->drv, tbl, low, is_green);
 857 }
 858
 859 /*
 860  * Simple function to compare two rate scale table types
 861  */
 862 static bool table_type_matches(struct iwl_scale_tbl_info *a,
 863                                struct iwl_scale_tbl_info *b)
 864 {
 865         return (a->lq_type == b->lq_type) && (a->ant_type == b->ant_type) &&
 866                 (a->is_SGI == b->is_SGI);
 867 }
 868
 869 static void rs_bt_update_lq(struct iwl_priv *priv, struct iwl_rxon_context *ctx,
 870                             struct iwl_lq_sta *lq_sta)
 871 {
 872         struct iwl_scale_tbl_info *tbl;
 873         bool full_concurrent = priv->bt_full_concurrent;
 874         unsigned long flags;
 875
 876         if (priv->bt_ant_couple_ok) {
 877                 /*
 878                  * Is there a need to switch between
 879                  * full concurrency and 3-wire?
 880                  */
 881                 spin_lock_irqsave(&priv->lock, flags);
 882                 if (priv->bt_ci_compliance && priv->bt_ant_couple_ok)
 883                         full_concurrent = true;
 884                 else
 885                         full_concurrent = false;
 886                 spin_unlock_irqrestore(&priv->lock, flags);
 887         }
 888         if ((priv->bt_traffic_load != priv->last_bt_traffic_load) ||
 889             (priv->bt_full_concurrent != full_concurrent)) {
 890                 priv->bt_full_concurrent = full_concurrent;
 891
 892                 /* Update uCode's rate table. */
 893                 tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
 894                 rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
 895                 iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
 896
 897                 queue_work(priv->workqueue, &priv->bt_full_concurrency);
 898         }
 899 }
 900
 901 /*
 902  * mac80211 sends us Tx status
 903  */
 904 static void rs_tx_status(void *priv_r, struct ieee80211_supported_band *sband,
 905                          struct ieee80211_sta *sta, void *priv_sta,
 906                          struct sk_buff *skb)
 907 {
 908         int legacy_success;
 909         int retries;
 910         int rs_index, mac_index, i;
 911         struct iwl_lq_sta *lq_sta = priv_sta;
 912         struct iwl_link_quality_cmd *table;
 913         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 914         struct iwl_priv *priv = (struct iwl_priv *)priv_r;
 915         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 916         enum mac80211_rate_control_flags mac_flags;
 917         u32 tx_rate;
 918         struct iwl_scale_tbl_info tbl_type;
 919         struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
 920         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
 921         struct iwl_rxon_context *ctx = sta_priv->common.ctx;
 922
 923         IWL_DEBUG_RATE_LIMIT(priv, "get frame ack response, update rate scale window\n");
 924
 925         /* Treat uninitialized rate scaling data same as non-existing. */
 926         if (!lq_sta) {
 927                 IWL_DEBUG_RATE(priv, "Station rate scaling not created yet.\n");
 928                 return;
 929         } else if (!lq_sta->drv) {
 930                 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
 931                 return;
 932         }
 933
 934         if (!ieee80211_is_data(hdr->frame_control) ||
 935             info->flags & IEEE80211_TX_CTL_NO_ACK)
 936                 return;
 937
 938         /* This packet was aggregated but doesn't carry status info */
 939         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
 940             !(info->flags & IEEE80211_TX_STAT_AMPDU))
 941                 return;
 942
 943         /*
 944          * Ignore this Tx frame response if its initial rate doesn't match
 945          * that of latest Link Quality command.  There may be stragglers
 946          * from a previous Link Quality command, but we're no longer interested
 947          * in those; they're either from the "active" mode while we're trying
 948          * to check "search" mode, or a prior "search" mode after we've moved
 949          * to a new "search" mode (which might become the new "active" mode).
 950          */
 951         table = &lq_sta->lq;
 952         tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
 953         rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type, &rs_index);
 954         if (priv->band == IEEE80211_BAND_5GHZ)
 955                 rs_index -= IWL_FIRST_OFDM_RATE;
 956         mac_flags = info->status.rates[0].flags;
 957         mac_index = info->status.rates[0].idx;
 958         /* For HT packets, map MCS to PLCP */
 959         if (mac_flags & IEEE80211_TX_RC_MCS) {
 960                 mac_index &= RATE_MCS_CODE_MSK; /* Remove # of streams */
 961                 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
 962                         mac_index++;
 963                 /*
 964                  * mac80211 HT index is always zero-indexed; we need to move
 965                  * HT OFDM rates after CCK rates in 2.4 GHz band
 966                  */
 967                 if (priv->band == IEEE80211_BAND_2GHZ)
 968                         mac_index += IWL_FIRST_OFDM_RATE;
 969         }
 970         /* Here we actually compare this rate to the latest LQ command */
 971         if ((mac_index < 0) ||
 972             (tbl_type.is_SGI != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
 973             (tbl_type.is_ht40 != !!(mac_flags & IEEE80211_TX_RC_40_MHZ_WIDTH)) ||
 974             (tbl_type.is_dup != !!(mac_flags & IEEE80211_TX_RC_DUP_DATA)) ||
 975             (tbl_type.ant_type != info->antenna_sel_tx) ||
 976             (!!(tx_rate & RATE_MCS_HT_MSK) != !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
 977             (!!(tx_rate & RATE_MCS_GF_MSK) != !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
 978             (rs_index != mac_index)) {
 979                 IWL_DEBUG_RATE(priv, "initial rate %d does not match %d (0x%x)\n", mac_index, rs_index, tx_rate);
 980                 /*
 981                  * Since rates mis-match, the last LQ command may have failed.
 982                  * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
 983                  * ... driver.
 984                  */
 985                 lq_sta->missed_rate_counter++;
 986                 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
 987                         lq_sta->missed_rate_counter = 0;
 988                         iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
 989                 }
 990                 /* Regardless, ignore this status info for outdated rate */
 991                 return;
 992         } else
 993                 /* Rate did match, so reset the missed_rate_counter */
 994                 lq_sta->missed_rate_counter = 0;
 995
 996         /* Figure out if rate scale algorithm is in active or search table */
 997         if (table_type_matches(&tbl_type,
 998                                 &(lq_sta->lq_info[lq_sta->active_tbl]))) {
 999                 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1000                 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1001         } else if (table_type_matches(&tbl_type,
1002                                 &lq_sta->lq_info[1 - lq_sta->active_tbl])) {
1003                 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1004                 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1005         } else {
1006                 IWL_DEBUG_RATE(priv, "Neither active nor search matches tx rate\n");
1007                 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1008                 IWL_DEBUG_RATE(priv, "active- lq:%x, ant:%x, SGI:%d\n",
1009                         tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
1010                 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1011                 IWL_DEBUG_RATE(priv, "search- lq:%x, ant:%x, SGI:%d\n",
1012                         tmp_tbl->lq_type, tmp_tbl->ant_type, tmp_tbl->is_SGI);
1013                 IWL_DEBUG_RATE(priv, "actual- lq:%x, ant:%x, SGI:%d\n",
1014                         tbl_type.lq_type, tbl_type.ant_type, tbl_type.is_SGI);
1015                 /*
1016                  * no matching table found, let's by-pass the data collection
1017                  * and continue to perform rate scale to find the rate table
1018                  */
1019                 rs_stay_in_table(lq_sta, true);
1020                 goto done;
1021         }
1022
1023         /*
1024          * Updating the frame history depends on whether packets were
1025          * aggregated.
1026          *
1027          * For aggregation, all packets were transmitted at the same rate, the
1028          * first index into rate scale table.
1029          */
1030         if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1031                 tx_rate = le32_to_cpu(table->rs_table[0].rate_n_flags);
1032                 rs_get_tbl_info_from_mcs(tx_rate, priv->band, &tbl_type,
1033                                 &rs_index);
1034                 rs_collect_tx_data(curr_tbl, rs_index,
1035                                    info->status.ampdu_len,
1036                                    info->status.ampdu_ack_len);
1037
1038                 /* Update success/fail counts if not searching for new mode */
1039                 if (lq_sta->stay_in_tbl) {
1040                         lq_sta->total_success += info->status.ampdu_ack_len;
1041                         lq_sta->total_failed += (info->status.ampdu_len -
1042                                         info->status.ampdu_ack_len);
1043                 }
1044         } else {
1045         /*
1046          * For legacy, update frame history with for each Tx retry.
1047          */
1048                 retries = info->status.rates[0].count - 1;
1049                 /* HW doesn't send more than 15 retries */
1050                 retries = min(retries, 15);
1051
1052                 /* The last transmission may have been successful */
1053                 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1054                 /* Collect data for each rate used during failed TX attempts */
1055                 for (i = 0; i <= retries; ++i) {
1056                         tx_rate = le32_to_cpu(table->rs_table[i].rate_n_flags);
1057                         rs_get_tbl_info_from_mcs(tx_rate, priv->band,
1058                                         &tbl_type, &rs_index);
1059                         /*
1060                          * Only collect stats if retried rate is in the same RS
1061                          * table as active/search.
1062                          */
1063                         if (table_type_matches(&tbl_type, curr_tbl))
1064                                 tmp_tbl = curr_tbl;
1065                         else if (table_type_matches(&tbl_type, other_tbl))
1066                                 tmp_tbl = other_tbl;
1067                         else
1068                                 continue;
1069                         rs_collect_tx_data(tmp_tbl, rs_index, 1,
1070                                            i < retries ? 0 : legacy_success);
1071                 }
1072
1073                 /* Update success/fail counts if not searching for new mode */
1074                 if (lq_sta->stay_in_tbl) {
1075                         lq_sta->total_success += legacy_success;
1076                         lq_sta->total_failed += retries + (1 - legacy_success);
1077                 }
1078         }
1079         /* The last TX rate is cached in lq_sta; it's set in if/else above */
1080         lq_sta->last_rate_n_flags = tx_rate;
1081 done:
1082         /* See if there's a better rate or modulation mode to try. */
1083         if (sta && sta->supp_rates[sband->band])
1084                 rs_rate_scale_perform(priv, skb, sta, lq_sta);
1085
1086 #if defined(CONFIG_MAC80211_DEBUGFS) && defined(CONFIG_IWLWIFI_DEVICE_SVTOOL)
1087         if ((priv->tm_fixed_rate) &&
1088             (priv->tm_fixed_rate != lq_sta->dbg_fixed_rate))
1089                 rs_program_fix_rate(priv, lq_sta);
1090 #endif
1091         if (priv->cfg->bt_params && priv->cfg->bt_params->advanced_bt_coexist)
1092                 rs_bt_update_lq(priv, ctx, lq_sta);
1093 }
1094
1095 /*
1096  * Begin a period of staying with a selected modulation mode.
1097  * Set "stay_in_tbl" flag to prevent any mode switches.
1098  * Set frame tx success limits according to legacy vs. high-throughput,
1099  * and reset overall (spanning all rates) tx success history statistics.
1100  * These control how long we stay using same modulation mode before
1101  * searching for a new mode.
1102  */
1103 static void rs_set_stay_in_table(struct iwl_priv *priv, u8 is_legacy,
1104                                  struct iwl_lq_sta *lq_sta)
1105 {
1106         IWL_DEBUG_RATE(priv, "we are staying in the same table\n");
1107         lq_sta->stay_in_tbl = 1;        /* only place this gets set */
1108         if (is_legacy) {
1109                 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1110                 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1111                 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1112         } else {
1113                 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1114                 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1115                 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1116         }
1117         lq_sta->table_count = 0;
1118         lq_sta->total_failed = 0;
1119         lq_sta->total_success = 0;
1120         lq_sta->flush_timer = jiffies;
1121         lq_sta->action_counter = 0;
1122 }
1123
1124 /*
1125  * Find correct throughput table for given mode of modulation
1126  */
1127 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1128                                       struct iwl_scale_tbl_info *tbl)
1129 {
1130         /* Used to choose among HT tables */
1131         s32 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1132
1133         /* Check for invalid LQ type */
1134         if (WARN_ON_ONCE(!is_legacy(tbl->lq_type) && !is_Ht(tbl->lq_type))) {
1135                 tbl->expected_tpt = expected_tpt_legacy;
1136                 return;
1137         }
1138
1139         /* Legacy rates have only one table */
1140         if (is_legacy(tbl->lq_type)) {
1141                 tbl->expected_tpt = expected_tpt_legacy;
1142                 return;
1143         }
1144
1145         /* Choose among many HT tables depending on number of streams
1146          * (SISO/MIMO2/MIMO3), channel width (20/40), SGI, and aggregation
1147          * status */
1148         if (is_siso(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1149                 ht_tbl_pointer = expected_tpt_siso20MHz;
1150         else if (is_siso(tbl->lq_type))
1151                 ht_tbl_pointer = expected_tpt_siso40MHz;
1152         else if (is_mimo2(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1153                 ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1154         else if (is_mimo2(tbl->lq_type))
1155                 ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1156         else if (is_mimo3(tbl->lq_type) && (!tbl->is_ht40 || lq_sta->is_dup))
1157                 ht_tbl_pointer = expected_tpt_mimo3_20MHz;
1158         else /* if (is_mimo3(tbl->lq_type)) <-- must be true */
1159                 ht_tbl_pointer = expected_tpt_mimo3_40MHz;
1160
1161         if (!tbl->is_SGI && !lq_sta->is_agg)            /* Normal */
1162                 tbl->expected_tpt = ht_tbl_pointer[0];
1163         else if (tbl->is_SGI && !lq_sta->is_agg)        /* SGI */
1164                 tbl->expected_tpt = ht_tbl_pointer[1];
1165         else if (!tbl->is_SGI && lq_sta->is_agg)        /* AGG */
1166                 tbl->expected_tpt = ht_tbl_pointer[2];
1167         else                                            /* AGG+SGI */
1168                 tbl->expected_tpt = ht_tbl_pointer[3];
1169 }
1170
1171 /*
1172  * Find starting rate for new "search" high-throughput mode of modulation.
1173  * Goal is to find lowest expected rate (under perfect conditions) that is
1174  * above the current measured throughput of "active" mode, to give new mode
1175  * a fair chance to prove itself without too many challenges.
1176  *
1177  * This gets called when transitioning to more aggressive modulation
1178  * (i.e. legacy to SISO or MIMO, or SISO to MIMO), as well as less aggressive
1179  * (i.e. MIMO to SISO).  When moving to MIMO, bit rate will typically need
1180  * to decrease to match "active" throughput.  When moving from MIMO to SISO,
1181  * bit rate will typically need to increase, but not if performance was bad.
1182  */
1183 static s32 rs_get_best_rate(struct iwl_priv *priv,
1184                             struct iwl_lq_sta *lq_sta,
1185                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1186                             u16 rate_mask, s8 index)
1187 {
1188         /* "active" values */
1189         struct iwl_scale_tbl_info *active_tbl =
1190             &(lq_sta->lq_info[lq_sta->active_tbl]);
1191         s32 active_sr = active_tbl->win[index].success_ratio;
1192         s32 active_tpt = active_tbl->expected_tpt[index];
1193
1194         /* expected "search" throughput */
1195         s32 *tpt_tbl = tbl->expected_tpt;
1196
1197         s32 new_rate, high, low, start_hi;
1198         u16 high_low;
1199         s8 rate = index;
1200
1201         new_rate = high = low = start_hi = IWL_RATE_INVALID;
1202
1203         for (; ;) {
1204                 high_low = rs_get_adjacent_rate(priv, rate, rate_mask,
1205                                                 tbl->lq_type);
1206
1207                 low = high_low & 0xff;
1208                 high = (high_low >> 8) & 0xff;
1209
1210                 /*
1211                  * Lower the "search" bit rate, to give new "search" mode
1212                  * approximately the same throughput as "active" if:
1213                  *
1214                  * 1) "Active" mode has been working modestly well (but not
1215                  *    great), and expected "search" throughput (under perfect
1216                  *    conditions) at candidate rate is above the actual
1217                  *    measured "active" throughput (but less than expected
1218                  *    "active" throughput under perfect conditions).
1219                  * OR
1220                  * 2) "Active" mode has been working perfectly or very well
1221                  *    and expected "search" throughput (under perfect
1222                  *    conditions) at candidate rate is above expected
1223                  *    "active" throughput (under perfect conditions).
1224                  */
1225                 if ((((100 * tpt_tbl[rate]) > lq_sta->last_tpt) &&
1226                      ((active_sr > IWL_RATE_DECREASE_TH) &&
1227                       (active_sr <= IWL_RATE_HIGH_TH) &&
1228                       (tpt_tbl[rate] <= active_tpt))) ||
1229                     ((active_sr >= IWL_RATE_SCALE_SWITCH) &&
1230                      (tpt_tbl[rate] > active_tpt))) {
1231
1232                         /* (2nd or later pass)
1233                          * If we've already tried to raise the rate, and are
1234                          * now trying to lower it, use the higher rate. */
1235                         if (start_hi != IWL_RATE_INVALID) {
1236                                 new_rate = start_hi;
1237                                 break;
1238                         }
1239
1240                         new_rate = rate;
1241
1242                         /* Loop again with lower rate */
1243                         if (low != IWL_RATE_INVALID)
1244                                 rate = low;
1245
1246                         /* Lower rate not available, use the original */
1247                         else
1248                                 break;
1249
1250                 /* Else try to raise the "search" rate to match "active" */
1251                 } else {
1252                         /* (2nd or later pass)
1253                          * If we've already tried to lower the rate, and are
1254                          * now trying to raise it, use the lower rate. */
1255                         if (new_rate != IWL_RATE_INVALID)
1256                                 break;
1257
1258                         /* Loop again with higher rate */
1259                         else if (high != IWL_RATE_INVALID) {
1260                                 start_hi = high;
1261                                 rate = high;
1262
1263                         /* Higher rate not available, use the original */
1264                         } else {
1265                                 new_rate = rate;
1266                                 break;
1267                         }
1268                 }
1269         }
1270
1271         return new_rate;
1272 }
1273
1274 /*
1275  * Set up search table for MIMO2
1276  */
1277 static int rs_switch_to_mimo2(struct iwl_priv *priv,
1278                              struct iwl_lq_sta *lq_sta,
1279                              struct ieee80211_conf *conf,
1280                              struct ieee80211_sta *sta,
1281                              struct iwl_scale_tbl_info *tbl, int index)
1282 {
1283         u16 rate_mask;
1284         s32 rate;
1285         s8 is_green = lq_sta->is_green;
1286         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1287         struct iwl_rxon_context *ctx = sta_priv->common.ctx;
1288
1289         if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1290                 return -1;
1291
1292         if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1293                                                 == WLAN_HT_CAP_SM_PS_STATIC)
1294                 return -1;
1295
1296         /* Need both Tx chains/antennas to support MIMO */
1297         if (priv->hw_params.tx_chains_num < 2)
1298                 return -1;
1299
1300         IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO2\n");
1301
1302         tbl->lq_type = LQ_MIMO2;
1303         tbl->is_dup = lq_sta->is_dup;
1304         tbl->action = 0;
1305         tbl->max_search = IWL_MAX_SEARCH;
1306         rate_mask = lq_sta->active_mimo2_rate;
1307
1308         if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1309                 tbl->is_ht40 = 1;
1310         else
1311                 tbl->is_ht40 = 0;
1312
1313         rs_set_expected_tpt_table(lq_sta, tbl);
1314
1315         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1316
1317         IWL_DEBUG_RATE(priv, "LQ: MIMO2 best rate %d mask %X\n", rate, rate_mask);
1318         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1319                 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1320                                                 rate, rate_mask);
1321                 return -1;
1322         }
1323         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1324
1325         IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1326                      tbl->current_rate, is_green);
1327         return 0;
1328 }
1329
1330 /*
1331  * Set up search table for MIMO3
1332  */
1333 static int rs_switch_to_mimo3(struct iwl_priv *priv,
1334                              struct iwl_lq_sta *lq_sta,
1335                              struct ieee80211_conf *conf,
1336                              struct ieee80211_sta *sta,
1337                              struct iwl_scale_tbl_info *tbl, int index)
1338 {
1339         u16 rate_mask;
1340         s32 rate;
1341         s8 is_green = lq_sta->is_green;
1342         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1343         struct iwl_rxon_context *ctx = sta_priv->common.ctx;
1344
1345         if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1346                 return -1;
1347
1348         if (((sta->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >> 2)
1349                                                 == WLAN_HT_CAP_SM_PS_STATIC)
1350                 return -1;
1351
1352         /* Need both Tx chains/antennas to support MIMO */
1353         if (priv->hw_params.tx_chains_num < 3)
1354                 return -1;
1355
1356         IWL_DEBUG_RATE(priv, "LQ: try to switch to MIMO3\n");
1357
1358         tbl->lq_type = LQ_MIMO3;
1359         tbl->is_dup = lq_sta->is_dup;
1360         tbl->action = 0;
1361         tbl->max_search = IWL_MAX_11N_MIMO3_SEARCH;
1362         rate_mask = lq_sta->active_mimo3_rate;
1363
1364         if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1365                 tbl->is_ht40 = 1;
1366         else
1367                 tbl->is_ht40 = 0;
1368
1369         rs_set_expected_tpt_table(lq_sta, tbl);
1370
1371         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1372
1373         IWL_DEBUG_RATE(priv, "LQ: MIMO3 best rate %d mask %X\n",
1374                 rate, rate_mask);
1375         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1376                 IWL_DEBUG_RATE(priv, "Can't switch with index %d rate mask %x\n",
1377                                                 rate, rate_mask);
1378                 return -1;
1379         }
1380         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1381
1382         IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1383                      tbl->current_rate, is_green);
1384         return 0;
1385 }
1386
1387 /*
1388  * Set up search table for SISO
1389  */
1390 static int rs_switch_to_siso(struct iwl_priv *priv,
1391                              struct iwl_lq_sta *lq_sta,
1392                              struct ieee80211_conf *conf,
1393                              struct ieee80211_sta *sta,
1394                              struct iwl_scale_tbl_info *tbl, int index)
1395 {
1396         u16 rate_mask;
1397         u8 is_green = lq_sta->is_green;
1398         s32 rate;
1399         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
1400         struct iwl_rxon_context *ctx = sta_priv->common.ctx;
1401
1402         if (!conf_is_ht(conf) || !sta->ht_cap.ht_supported)
1403                 return -1;
1404
1405         IWL_DEBUG_RATE(priv, "LQ: try to switch to SISO\n");
1406
1407         tbl->is_dup = lq_sta->is_dup;
1408         tbl->lq_type = LQ_SISO;
1409         tbl->action = 0;
1410         tbl->max_search = IWL_MAX_SEARCH;
1411         rate_mask = lq_sta->active_siso_rate;
1412
1413         if (iwl_is_ht40_tx_allowed(priv, ctx, &sta->ht_cap))
1414                 tbl->is_ht40 = 1;
1415         else
1416                 tbl->is_ht40 = 0;
1417
1418         if (is_green)
1419                 tbl->is_SGI = 0; /*11n spec: no SGI in SISO+Greenfield*/
1420
1421         rs_set_expected_tpt_table(lq_sta, tbl);
1422         rate = rs_get_best_rate(priv, lq_sta, tbl, rate_mask, index);
1423
1424         IWL_DEBUG_RATE(priv, "LQ: get best rate %d mask %X\n", rate, rate_mask);
1425         if ((rate == IWL_RATE_INVALID) || !((1 << rate) & rate_mask)) {
1426                 IWL_DEBUG_RATE(priv, "can not switch with index %d rate mask %x\n",
1427                              rate, rate_mask);
1428                 return -1;
1429         }
1430         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, rate, is_green);
1431         IWL_DEBUG_RATE(priv, "LQ: Switch to new mcs %X index is green %X\n",
1432                      tbl->current_rate, is_green);
1433         return 0;
1434 }
1435
1436 /*
1437  * Try to switch to new modulation mode from legacy
1438  */
1439 static int rs_move_legacy_other(struct iwl_priv *priv,
1440                                 struct iwl_lq_sta *lq_sta,
1441                                 struct ieee80211_conf *conf,
1442                                 struct ieee80211_sta *sta,
1443                                 int index)
1444 {
1445         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1446         struct iwl_scale_tbl_info *search_tbl =
1447                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1448         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1449         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1450                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1451         u8 start_action;
1452         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1453         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1454         int ret = 0;
1455         u8 update_search_tbl_counter = 0;
1456
1457         switch (priv->bt_traffic_load) {
1458         case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1459                 /* nothing */
1460                 break;
1461         case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1462                 /* avoid antenna B unless MIMO */
1463                 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1464                 if (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2)
1465                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1466                 break;
1467         case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1468         case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1469                 /* avoid antenna B and MIMO */
1470                 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1471                 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2 &&
1472                     tbl->action != IWL_LEGACY_SWITCH_SISO)
1473                         tbl->action = IWL_LEGACY_SWITCH_SISO;
1474                 break;
1475         default:
1476                 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1477                 break;
1478         }
1479
1480         if (!iwl_ht_enabled(priv))
1481                 /* stay in Legacy */
1482                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1483         else if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1484                    tbl->action > IWL_LEGACY_SWITCH_SISO)
1485                 tbl->action = IWL_LEGACY_SWITCH_SISO;
1486
1487         /* configure as 1x1 if bt full concurrency */
1488         if (priv->bt_full_concurrent) {
1489                 if (!iwl_ht_enabled(priv))
1490                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1491                 else if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1492                         tbl->action = IWL_LEGACY_SWITCH_SISO;
1493                 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1494         }
1495
1496         start_action = tbl->action;
1497         for (; ;) {
1498                 lq_sta->action_counter++;
1499                 switch (tbl->action) {
1500                 case IWL_LEGACY_SWITCH_ANTENNA1:
1501                 case IWL_LEGACY_SWITCH_ANTENNA2:
1502                         IWL_DEBUG_RATE(priv, "LQ: Legacy toggle Antenna\n");
1503
1504                         if ((tbl->action == IWL_LEGACY_SWITCH_ANTENNA1 &&
1505                                                         tx_chains_num <= 1) ||
1506                             (tbl->action == IWL_LEGACY_SWITCH_ANTENNA2 &&
1507                                                         tx_chains_num <= 2))
1508                                 break;
1509
1510                         /* Don't change antenna if success has been great */
1511                         if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1512                             !priv->bt_full_concurrent &&
1513                             priv->bt_traffic_load ==
1514                                         IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1515                                 break;
1516
1517                         /* Set up search table to try other antenna */
1518                         memcpy(search_tbl, tbl, sz);
1519
1520                         if (rs_toggle_antenna(valid_tx_ant,
1521                                 &search_tbl->current_rate, search_tbl)) {
1522                                 update_search_tbl_counter = 1;
1523                                 rs_set_expected_tpt_table(lq_sta, search_tbl);
1524                                 goto out;
1525                         }
1526                         break;
1527                 case IWL_LEGACY_SWITCH_SISO:
1528                         IWL_DEBUG_RATE(priv, "LQ: Legacy switch to SISO\n");
1529
1530                         /* Set up search table to try SISO */
1531                         memcpy(search_tbl, tbl, sz);
1532                         search_tbl->is_SGI = 0;
1533                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1534                                                  search_tbl, index);
1535                         if (!ret) {
1536                                 lq_sta->action_counter = 0;
1537                                 goto out;
1538                         }
1539
1540                         break;
1541                 case IWL_LEGACY_SWITCH_MIMO2_AB:
1542                 case IWL_LEGACY_SWITCH_MIMO2_AC:
1543                 case IWL_LEGACY_SWITCH_MIMO2_BC:
1544                         IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO2\n");
1545
1546                         /* Set up search table to try MIMO */
1547                         memcpy(search_tbl, tbl, sz);
1548                         search_tbl->is_SGI = 0;
1549
1550                         if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AB)
1551                                 search_tbl->ant_type = ANT_AB;
1552                         else if (tbl->action == IWL_LEGACY_SWITCH_MIMO2_AC)
1553                                 search_tbl->ant_type = ANT_AC;
1554                         else
1555                                 search_tbl->ant_type = ANT_BC;
1556
1557                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1558                                 break;
1559
1560                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1561                                                  search_tbl, index);
1562                         if (!ret) {
1563                                 lq_sta->action_counter = 0;
1564                                 goto out;
1565                         }
1566                         break;
1567
1568                 case IWL_LEGACY_SWITCH_MIMO3_ABC:
1569                         IWL_DEBUG_RATE(priv, "LQ: Legacy switch to MIMO3\n");
1570
1571                         /* Set up search table to try MIMO3 */
1572                         memcpy(search_tbl, tbl, sz);
1573                         search_tbl->is_SGI = 0;
1574
1575                         search_tbl->ant_type = ANT_ABC;
1576
1577                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1578                                 break;
1579
1580                         ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1581                                                  search_tbl, index);
1582                         if (!ret) {
1583                                 lq_sta->action_counter = 0;
1584                                 goto out;
1585                         }
1586                         break;
1587                 }
1588                 tbl->action++;
1589                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1590                         tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1591
1592                 if (tbl->action == start_action)
1593                         break;
1594
1595         }
1596         search_tbl->lq_type = LQ_NONE;
1597         return 0;
1598
1599 out:
1600         lq_sta->search_better_tbl = 1;
1601         tbl->action++;
1602         if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1603                 tbl->action = IWL_LEGACY_SWITCH_ANTENNA1;
1604         if (update_search_tbl_counter)
1605                 search_tbl->action = tbl->action;
1606         return 0;
1607
1608 }
1609
1610 /*
1611  * Try to switch to new modulation mode from SISO
1612  */
1613 static int rs_move_siso_to_other(struct iwl_priv *priv,
1614                                  struct iwl_lq_sta *lq_sta,
1615                                  struct ieee80211_conf *conf,
1616                                  struct ieee80211_sta *sta, int index)
1617 {
1618         u8 is_green = lq_sta->is_green;
1619         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1620         struct iwl_scale_tbl_info *search_tbl =
1621                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1622         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1623         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1624         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1625                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1626         u8 start_action;
1627         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1628         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1629         u8 update_search_tbl_counter = 0;
1630         int ret;
1631
1632         switch (priv->bt_traffic_load) {
1633         case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1634                 /* nothing */
1635                 break;
1636         case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1637                 /* avoid antenna B unless MIMO */
1638                 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1639                 if (tbl->action == IWL_SISO_SWITCH_ANTENNA2)
1640                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1641                 break;
1642         case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1643         case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1644                 /* avoid antenna B and MIMO */
1645                 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1646                 if (tbl->action != IWL_SISO_SWITCH_ANTENNA1)
1647                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1648                 break;
1649         default:
1650                 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1651                 break;
1652         }
1653
1654         if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE &&
1655             tbl->action > IWL_SISO_SWITCH_ANTENNA2) {
1656                 /* stay in SISO */
1657                 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1658         }
1659
1660         /* configure as 1x1 if bt full concurrency */
1661         if (priv->bt_full_concurrent) {
1662                 valid_tx_ant = first_antenna(priv->hw_params.valid_tx_ant);
1663                 if (tbl->action >= IWL_LEGACY_SWITCH_ANTENNA2)
1664                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1665         }
1666
1667         start_action = tbl->action;
1668         for (;;) {
1669                 lq_sta->action_counter++;
1670                 switch (tbl->action) {
1671                 case IWL_SISO_SWITCH_ANTENNA1:
1672                 case IWL_SISO_SWITCH_ANTENNA2:
1673                         IWL_DEBUG_RATE(priv, "LQ: SISO toggle Antenna\n");
1674                         if ((tbl->action == IWL_SISO_SWITCH_ANTENNA1 &&
1675                                                 tx_chains_num <= 1) ||
1676                             (tbl->action == IWL_SISO_SWITCH_ANTENNA2 &&
1677                                                 tx_chains_num <= 2))
1678                                 break;
1679
1680                         if (window->success_ratio >= IWL_RS_GOOD_RATIO &&
1681                             !priv->bt_full_concurrent &&
1682                             priv->bt_traffic_load ==
1683                                         IWL_BT_COEX_TRAFFIC_LOAD_NONE)
1684                                 break;
1685
1686                         memcpy(search_tbl, tbl, sz);
1687                         if (rs_toggle_antenna(valid_tx_ant,
1688                                        &search_tbl->current_rate, search_tbl)) {
1689                                 update_search_tbl_counter = 1;
1690                                 goto out;
1691                         }
1692                         break;
1693                 case IWL_SISO_SWITCH_MIMO2_AB:
1694                 case IWL_SISO_SWITCH_MIMO2_AC:
1695                 case IWL_SISO_SWITCH_MIMO2_BC:
1696                         IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO2\n");
1697                         memcpy(search_tbl, tbl, sz);
1698                         search_tbl->is_SGI = 0;
1699
1700                         if (tbl->action == IWL_SISO_SWITCH_MIMO2_AB)
1701                                 search_tbl->ant_type = ANT_AB;
1702                         else if (tbl->action == IWL_SISO_SWITCH_MIMO2_AC)
1703                                 search_tbl->ant_type = ANT_AC;
1704                         else
1705                                 search_tbl->ant_type = ANT_BC;
1706
1707                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1708                                 break;
1709
1710                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
1711                                                  search_tbl, index);
1712                         if (!ret)
1713                                 goto out;
1714                         break;
1715                 case IWL_SISO_SWITCH_GI:
1716                         if (!tbl->is_ht40 && !(ht_cap->cap &
1717                                                 IEEE80211_HT_CAP_SGI_20))
1718                                 break;
1719                         if (tbl->is_ht40 && !(ht_cap->cap &
1720                                                 IEEE80211_HT_CAP_SGI_40))
1721                                 break;
1722
1723                         IWL_DEBUG_RATE(priv, "LQ: SISO toggle SGI/NGI\n");
1724
1725                         memcpy(search_tbl, tbl, sz);
1726                         if (is_green) {
1727                                 if (!tbl->is_SGI)
1728                                         break;
1729                                 else
1730                                         IWL_ERR(priv,
1731                                                 "SGI was set in GF+SISO\n");
1732                         }
1733                         search_tbl->is_SGI = !tbl->is_SGI;
1734                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1735                         if (tbl->is_SGI) {
1736                                 s32 tpt = lq_sta->last_tpt / 100;
1737                                 if (tpt >= search_tbl->expected_tpt[index])
1738                                         break;
1739                         }
1740                         search_tbl->current_rate =
1741                                 rate_n_flags_from_tbl(priv, search_tbl,
1742                                                       index, is_green);
1743                         update_search_tbl_counter = 1;
1744                         goto out;
1745                 case IWL_SISO_SWITCH_MIMO3_ABC:
1746                         IWL_DEBUG_RATE(priv, "LQ: SISO switch to MIMO3\n");
1747                         memcpy(search_tbl, tbl, sz);
1748                         search_tbl->is_SGI = 0;
1749                         search_tbl->ant_type = ANT_ABC;
1750
1751                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1752                                 break;
1753
1754                         ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1755                                                  search_tbl, index);
1756                         if (!ret)
1757                                 goto out;
1758                         break;
1759                 }
1760                 tbl->action++;
1761                 if (tbl->action > IWL_LEGACY_SWITCH_MIMO3_ABC)
1762                         tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1763
1764                 if (tbl->action == start_action)
1765                         break;
1766         }
1767         search_tbl->lq_type = LQ_NONE;
1768         return 0;
1769
1770  out:
1771         lq_sta->search_better_tbl = 1;
1772         tbl->action++;
1773         if (tbl->action > IWL_SISO_SWITCH_MIMO3_ABC)
1774                 tbl->action = IWL_SISO_SWITCH_ANTENNA1;
1775         if (update_search_tbl_counter)
1776                 search_tbl->action = tbl->action;
1777
1778         return 0;
1779 }
1780
1781 /*
1782  * Try to switch to new modulation mode from MIMO2
1783  */
1784 static int rs_move_mimo2_to_other(struct iwl_priv *priv,
1785                                  struct iwl_lq_sta *lq_sta,
1786                                  struct ieee80211_conf *conf,
1787                                  struct ieee80211_sta *sta, int index)
1788 {
1789         s8 is_green = lq_sta->is_green;
1790         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1791         struct iwl_scale_tbl_info *search_tbl =
1792                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1793         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1794         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1795         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1796                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1797         u8 start_action;
1798         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1799         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1800         u8 update_search_tbl_counter = 0;
1801         int ret;
1802
1803         switch (priv->bt_traffic_load) {
1804         case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1805                 /* nothing */
1806                 break;
1807         case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1808         case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1809                 /* avoid antenna B and MIMO */
1810                 if (tbl->action != IWL_MIMO2_SWITCH_SISO_A)
1811                         tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1812                 break;
1813         case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1814                 /* avoid antenna B unless MIMO */
1815                 if (tbl->action == IWL_MIMO2_SWITCH_SISO_B ||
1816                     tbl->action == IWL_MIMO2_SWITCH_SISO_C)
1817                         tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1818                 break;
1819         default:
1820                 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1821                 break;
1822         }
1823
1824         if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1825             (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1826              tbl->action > IWL_MIMO2_SWITCH_SISO_C)) {
1827                 /* switch in SISO */
1828                 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1829         }
1830
1831         /* configure as 1x1 if bt full concurrency */
1832         if (priv->bt_full_concurrent &&
1833             (tbl->action < IWL_MIMO2_SWITCH_SISO_A ||
1834              tbl->action > IWL_MIMO2_SWITCH_SISO_C))
1835                 tbl->action = IWL_MIMO2_SWITCH_SISO_A;
1836
1837         start_action = tbl->action;
1838         for (;;) {
1839                 lq_sta->action_counter++;
1840                 switch (tbl->action) {
1841                 case IWL_MIMO2_SWITCH_ANTENNA1:
1842                 case IWL_MIMO2_SWITCH_ANTENNA2:
1843                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle Antennas\n");
1844
1845                         if (tx_chains_num <= 2)
1846                                 break;
1847
1848                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
1849                                 break;
1850
1851                         memcpy(search_tbl, tbl, sz);
1852                         if (rs_toggle_antenna(valid_tx_ant,
1853                                        &search_tbl->current_rate, search_tbl)) {
1854                                 update_search_tbl_counter = 1;
1855                                 goto out;
1856                         }
1857                         break;
1858                 case IWL_MIMO2_SWITCH_SISO_A:
1859                 case IWL_MIMO2_SWITCH_SISO_B:
1860                 case IWL_MIMO2_SWITCH_SISO_C:
1861                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to SISO\n");
1862
1863                         /* Set up new search table for SISO */
1864                         memcpy(search_tbl, tbl, sz);
1865
1866                         if (tbl->action == IWL_MIMO2_SWITCH_SISO_A)
1867                                 search_tbl->ant_type = ANT_A;
1868                         else if (tbl->action == IWL_MIMO2_SWITCH_SISO_B)
1869                                 search_tbl->ant_type = ANT_B;
1870                         else
1871                                 search_tbl->ant_type = ANT_C;
1872
1873                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1874                                 break;
1875
1876                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
1877                                                  search_tbl, index);
1878                         if (!ret)
1879                                 goto out;
1880
1881                         break;
1882
1883                 case IWL_MIMO2_SWITCH_GI:
1884                         if (!tbl->is_ht40 && !(ht_cap->cap &
1885                                                 IEEE80211_HT_CAP_SGI_20))
1886                                 break;
1887                         if (tbl->is_ht40 && !(ht_cap->cap &
1888                                                 IEEE80211_HT_CAP_SGI_40))
1889                                 break;
1890
1891                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 toggle SGI/NGI\n");
1892
1893                         /* Set up new search table for MIMO2 */
1894                         memcpy(search_tbl, tbl, sz);
1895                         search_tbl->is_SGI = !tbl->is_SGI;
1896                         rs_set_expected_tpt_table(lq_sta, search_tbl);
1897                         /*
1898                          * If active table already uses the fastest possible
1899                          * modulation (dual stream with short guard interval),
1900                          * and it's working well, there's no need to look
1901                          * for a better type of modulation!
1902                          */
1903                         if (tbl->is_SGI) {
1904                                 s32 tpt = lq_sta->last_tpt / 100;
1905                                 if (tpt >= search_tbl->expected_tpt[index])
1906                                         break;
1907                         }
1908                         search_tbl->current_rate =
1909                                 rate_n_flags_from_tbl(priv, search_tbl,
1910                                                       index, is_green);
1911                         update_search_tbl_counter = 1;
1912                         goto out;
1913
1914                 case IWL_MIMO2_SWITCH_MIMO3_ABC:
1915                         IWL_DEBUG_RATE(priv, "LQ: MIMO2 switch to MIMO3\n");
1916                         memcpy(search_tbl, tbl, sz);
1917                         search_tbl->is_SGI = 0;
1918                         search_tbl->ant_type = ANT_ABC;
1919
1920                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
1921                                 break;
1922
1923                         ret = rs_switch_to_mimo3(priv, lq_sta, conf, sta,
1924                                                  search_tbl, index);
1925                         if (!ret)
1926                                 goto out;
1927
1928                         break;
1929                 }
1930                 tbl->action++;
1931                 if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1932                         tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1933
1934                 if (tbl->action == start_action)
1935                         break;
1936         }
1937         search_tbl->lq_type = LQ_NONE;
1938         return 0;
1939  out:
1940         lq_sta->search_better_tbl = 1;
1941         tbl->action++;
1942         if (tbl->action > IWL_MIMO2_SWITCH_MIMO3_ABC)
1943                 tbl->action = IWL_MIMO2_SWITCH_ANTENNA1;
1944         if (update_search_tbl_counter)
1945                 search_tbl->action = tbl->action;
1946
1947         return 0;
1948
1949 }
1950
1951 /*
1952  * Try to switch to new modulation mode from MIMO3
1953  */
1954 static int rs_move_mimo3_to_other(struct iwl_priv *priv,
1955                                  struct iwl_lq_sta *lq_sta,
1956                                  struct ieee80211_conf *conf,
1957                                  struct ieee80211_sta *sta, int index)
1958 {
1959         s8 is_green = lq_sta->is_green;
1960         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1961         struct iwl_scale_tbl_info *search_tbl =
1962                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1963         struct iwl_rate_scale_data *window = &(tbl->win[index]);
1964         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
1965         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1966                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1967         u8 start_action;
1968         u8 valid_tx_ant = priv->hw_params.valid_tx_ant;
1969         u8 tx_chains_num = priv->hw_params.tx_chains_num;
1970         int ret;
1971         u8 update_search_tbl_counter = 0;
1972
1973         switch (priv->bt_traffic_load) {
1974         case IWL_BT_COEX_TRAFFIC_LOAD_NONE:
1975                 /* nothing */
1976                 break;
1977         case IWL_BT_COEX_TRAFFIC_LOAD_HIGH:
1978         case IWL_BT_COEX_TRAFFIC_LOAD_CONTINUOUS:
1979                 /* avoid antenna B and MIMO */
1980                 if (tbl->action != IWL_MIMO3_SWITCH_SISO_A)
1981                         tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1982                 break;
1983         case IWL_BT_COEX_TRAFFIC_LOAD_LOW:
1984                 /* avoid antenna B unless MIMO */
1985                 if (tbl->action == IWL_MIMO3_SWITCH_SISO_B ||
1986                     tbl->action == IWL_MIMO3_SWITCH_SISO_C)
1987                         tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1988                 break;
1989         default:
1990                 IWL_ERR(priv, "Invalid BT load %d", priv->bt_traffic_load);
1991                 break;
1992         }
1993
1994         if ((iwl_tx_ant_restriction(priv) == IWL_ANT_OK_SINGLE) &&
1995             (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
1996              tbl->action > IWL_MIMO3_SWITCH_SISO_C)) {
1997                 /* switch in SISO */
1998                 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
1999         }
2000
2001         /* configure as 1x1 if bt full concurrency */
2002         if (priv->bt_full_concurrent &&
2003             (tbl->action < IWL_MIMO3_SWITCH_SISO_A ||
2004              tbl->action > IWL_MIMO3_SWITCH_SISO_C))
2005                 tbl->action = IWL_MIMO3_SWITCH_SISO_A;
2006
2007         start_action = tbl->action;
2008         for (;;) {
2009                 lq_sta->action_counter++;
2010                 switch (tbl->action) {
2011                 case IWL_MIMO3_SWITCH_ANTENNA1:
2012                 case IWL_MIMO3_SWITCH_ANTENNA2:
2013                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle Antennas\n");
2014
2015                         if (tx_chains_num <= 3)
2016                                 break;
2017
2018                         if (window->success_ratio >= IWL_RS_GOOD_RATIO)
2019                                 break;
2020
2021                         memcpy(search_tbl, tbl, sz);
2022                         if (rs_toggle_antenna(valid_tx_ant,
2023                                        &search_tbl->current_rate, search_tbl))
2024                                 goto out;
2025                         break;
2026                 case IWL_MIMO3_SWITCH_SISO_A:
2027                 case IWL_MIMO3_SWITCH_SISO_B:
2028                 case IWL_MIMO3_SWITCH_SISO_C:
2029                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to SISO\n");
2030
2031                         /* Set up new search table for SISO */
2032                         memcpy(search_tbl, tbl, sz);
2033
2034                         if (tbl->action == IWL_MIMO3_SWITCH_SISO_A)
2035                                 search_tbl->ant_type = ANT_A;
2036                         else if (tbl->action == IWL_MIMO3_SWITCH_SISO_B)
2037                                 search_tbl->ant_type = ANT_B;
2038                         else
2039                                 search_tbl->ant_type = ANT_C;
2040
2041                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
2042                                 break;
2043
2044                         ret = rs_switch_to_siso(priv, lq_sta, conf, sta,
2045                                                  search_tbl, index);
2046                         if (!ret)
2047                                 goto out;
2048
2049                         break;
2050
2051                 case IWL_MIMO3_SWITCH_MIMO2_AB:
2052                 case IWL_MIMO3_SWITCH_MIMO2_AC:
2053                 case IWL_MIMO3_SWITCH_MIMO2_BC:
2054                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 switch to MIMO2\n");
2055
2056                         memcpy(search_tbl, tbl, sz);
2057                         search_tbl->is_SGI = 0;
2058                         if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AB)
2059                                 search_tbl->ant_type = ANT_AB;
2060                         else if (tbl->action == IWL_MIMO3_SWITCH_MIMO2_AC)
2061                                 search_tbl->ant_type = ANT_AC;
2062                         else
2063                                 search_tbl->ant_type = ANT_BC;
2064
2065                         if (!rs_is_valid_ant(valid_tx_ant, search_tbl->ant_type))
2066                                 break;
2067
2068                         ret = rs_switch_to_mimo2(priv, lq_sta, conf, sta,
2069                                                  search_tbl, index);
2070                         if (!ret)
2071                                 goto out;
2072
2073                         break;
2074
2075                 case IWL_MIMO3_SWITCH_GI:
2076                         if (!tbl->is_ht40 && !(ht_cap->cap &
2077                                                 IEEE80211_HT_CAP_SGI_20))
2078                                 break;
2079                         if (tbl->is_ht40 && !(ht_cap->cap &
2080                                                 IEEE80211_HT_CAP_SGI_40))
2081                                 break;
2082
2083                         IWL_DEBUG_RATE(priv, "LQ: MIMO3 toggle SGI/NGI\n");
2084
2085                         /* Set up new search table for MIMO */
2086                         memcpy(search_tbl, tbl, sz);
2087                         search_tbl->is_SGI = !tbl->is_SGI;
2088                         rs_set_expected_tpt_table(lq_sta, search_tbl);
2089                         /*
2090                          * If active table already uses the fastest possible
2091                          * modulation (dual stream with short guard interval),
2092                          * and it's working well, there's no need to look
2093                          * for a better type of modulation!
2094                          */
2095                         if (tbl->is_SGI) {
2096                                 s32 tpt = lq_sta->last_tpt / 100;
2097                                 if (tpt >= search_tbl->expected_tpt[index])
2098                                         break;
2099                         }
2100                         search_tbl->current_rate =
2101                                 rate_n_flags_from_tbl(priv, search_tbl,
2102                                                       index, is_green);
2103                         update_search_tbl_counter = 1;
2104                         goto out;
2105                 }
2106                 tbl->action++;
2107                 if (tbl->action > IWL_MIMO3_SWITCH_GI)
2108                         tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2109
2110                 if (tbl->action == start_action)
2111                         break;
2112         }
2113         search_tbl->lq_type = LQ_NONE;
2114         return 0;
2115  out:
2116         lq_sta->search_better_tbl = 1;
2117         tbl->action++;
2118         if (tbl->action > IWL_MIMO3_SWITCH_GI)
2119                 tbl->action = IWL_MIMO3_SWITCH_ANTENNA1;
2120         if (update_search_tbl_counter)
2121                 search_tbl->action = tbl->action;
2122
2123         return 0;
2124
2125 }
2126
2127 /*
2128  * Check whether we should continue using same modulation mode, or
2129  * begin search for a new mode, based on:
2130  * 1) # tx successes or failures while using this mode
2131  * 2) # times calling this function
2132  * 3) elapsed time in this mode (not used, for now)
2133  */
2134 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
2135 {
2136         struct iwl_scale_tbl_info *tbl;
2137         int i;
2138         int active_tbl;
2139         int flush_interval_passed = 0;
2140         struct iwl_priv *priv;
2141
2142         priv = lq_sta->drv;
2143         active_tbl = lq_sta->active_tbl;
2144
2145         tbl = &(lq_sta->lq_info[active_tbl]);
2146
2147         /* If we've been disallowing search, see if we should now allow it */
2148         if (lq_sta->stay_in_tbl) {
2149
2150                 /* Elapsed time using current modulation mode */
2151                 if (lq_sta->flush_timer)
2152                         flush_interval_passed =
2153                         time_after(jiffies,
2154                                         (unsigned long)(lq_sta->flush_timer +
2155                                         IWL_RATE_SCALE_FLUSH_INTVL));
2156
2157                 /*
2158                  * Check if we should allow search for new modulation mode.
2159                  * If many frames have failed or succeeded, or we've used
2160                  * this same modulation for a long time, allow search, and
2161                  * reset history stats that keep track of whether we should
2162                  * allow a new search.  Also (below) reset all bitmaps and
2163                  * stats in active history.
2164                  */
2165                 if (force_search ||
2166                     (lq_sta->total_failed > lq_sta->max_failure_limit) ||
2167                     (lq_sta->total_success > lq_sta->max_success_limit) ||
2168                     ((!lq_sta->search_better_tbl) && (lq_sta->flush_timer)
2169                      && (flush_interval_passed))) {
2170                         IWL_DEBUG_RATE(priv, "LQ: stay is expired %d %d %d\n:",
2171                                      lq_sta->total_failed,
2172                                      lq_sta->total_success,
2173                                      flush_interval_passed);
2174
2175                         /* Allow search for new mode */
2176                         lq_sta->stay_in_tbl = 0;        /* only place reset */
2177                         lq_sta->total_failed = 0;
2178                         lq_sta->total_success = 0;
2179                         lq_sta->flush_timer = 0;
2180
2181                 /*
2182                  * Else if we've used this modulation mode enough repetitions
2183                  * (regardless of elapsed time or success/failure), reset
2184                  * history bitmaps and rate-specific stats for all rates in
2185                  * active table.
2186                  */
2187                 } else {
2188                         lq_sta->table_count++;
2189                         if (lq_sta->table_count >=
2190                             lq_sta->table_count_limit) {
2191                                 lq_sta->table_count = 0;
2192
2193                                 IWL_DEBUG_RATE(priv, "LQ: stay in table clear win\n");
2194                                 for (i = 0; i < IWL_RATE_COUNT; i++)
2195                                         rs_rate_scale_clear_window(
2196                                                 &(tbl->win[i]));
2197                         }
2198                 }
2199
2200                 /* If transitioning to allow "search", reset all history
2201                  * bitmaps and stats in active table (this will become the new
2202                  * "search" table). */
2203                 if (!lq_sta->stay_in_tbl) {
2204                         for (i = 0; i < IWL_RATE_COUNT; i++)
2205                                 rs_rate_scale_clear_window(&(tbl->win[i]));
2206                 }
2207         }
2208 }
2209
2210 /*
2211  * setup rate table in uCode
2212  * return rate_n_flags as used in the table
2213  */
2214 static void rs_update_rate_tbl(struct iwl_priv *priv,
2215                                struct iwl_rxon_context *ctx,
2216                                struct iwl_lq_sta *lq_sta,
2217                                struct iwl_scale_tbl_info *tbl,
2218                                int index, u8 is_green)
2219 {
2220         u32 rate;
2221
2222         /* Update uCode's rate table. */
2223         rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2224         rs_fill_link_cmd(priv, lq_sta, rate);
2225         iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2226 }
2227
2228 /*
2229  * Do rate scaling and search for new modulation mode.
2230  */
2231 static void rs_rate_scale_perform(struct iwl_priv *priv,
2232                                   struct sk_buff *skb,
2233                                   struct ieee80211_sta *sta,
2234                                   struct iwl_lq_sta *lq_sta)
2235 {
2236         struct ieee80211_hw *hw = priv->hw;
2237         struct ieee80211_conf *conf = &hw->conf;
2238         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2239         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
2240         int low = IWL_RATE_INVALID;
2241         int high = IWL_RATE_INVALID;
2242         int index;
2243         int i;
2244         struct iwl_rate_scale_data *window = NULL;
2245         int current_tpt = IWL_INVALID_VALUE;
2246         int low_tpt = IWL_INVALID_VALUE;
2247         int high_tpt = IWL_INVALID_VALUE;
2248         u32 fail_count;
2249         s8 scale_action = 0;
2250         u16 rate_mask;
2251         u8 update_lq = 0;
2252         struct iwl_scale_tbl_info *tbl, *tbl1;
2253         u16 rate_scale_index_msk = 0;
2254         u8 is_green = 0;
2255         u8 active_tbl = 0;
2256         u8 done_search = 0;
2257         u16 high_low;
2258         s32 sr;
2259         u8 tid = MAX_TID_COUNT;
2260         struct iwl_tid_data *tid_data;
2261         struct iwl_station_priv *sta_priv = (void *)sta->drv_priv;
2262         struct iwl_rxon_context *ctx = sta_priv->common.ctx;
2263
2264         IWL_DEBUG_RATE(priv, "rate scale calculate new rate for skb\n");
2265
2266         /* Send management frames and NO_ACK data using lowest rate. */
2267         /* TODO: this could probably be improved.. */
2268         if (!ieee80211_is_data(hdr->frame_control) ||
2269             info->flags & IEEE80211_TX_CTL_NO_ACK)
2270                 return;
2271
2272         if (!sta || !lq_sta)
2273                 return;
2274
2275         lq_sta->supp_rates = sta->supp_rates[lq_sta->band];
2276
2277         tid = rs_tl_add_packet(lq_sta, hdr);
2278         if ((tid != MAX_TID_COUNT) && (lq_sta->tx_agg_tid_en & (1 << tid))) {
2279                 tid_data = &priv->stations[lq_sta->lq.sta_id].tid[tid];
2280                 if (tid_data->agg.state == IWL_AGG_OFF)
2281                         lq_sta->is_agg = 0;
2282                 else
2283                         lq_sta->is_agg = 1;
2284         } else
2285                 lq_sta->is_agg = 0;
2286
2287         /*
2288          * Select rate-scale / modulation-mode table to work with in
2289          * the rest of this function:  "search" if searching for better
2290          * modulation mode, or "active" if doing rate scaling within a mode.
2291          */
2292         if (!lq_sta->search_better_tbl)
2293                 active_tbl = lq_sta->active_tbl;
2294         else
2295                 active_tbl = 1 - lq_sta->active_tbl;
2296
2297         tbl = &(lq_sta->lq_info[active_tbl]);
2298         if (is_legacy(tbl->lq_type))
2299                 lq_sta->is_green = 0;
2300         else
2301                 lq_sta->is_green = rs_use_green(sta);
2302         is_green = lq_sta->is_green;
2303
2304         /* current tx rate */
2305         index = lq_sta->last_txrate_idx;
2306
2307         IWL_DEBUG_RATE(priv, "Rate scale index %d for type %d\n", index,
2308                        tbl->lq_type);
2309
2310         /* rates available for this association, and for modulation mode */
2311         rate_mask = rs_get_supported_rates(lq_sta, hdr, tbl->lq_type);
2312
2313         IWL_DEBUG_RATE(priv, "mask 0x%04X\n", rate_mask);
2314
2315         /* mask with station rate restriction */
2316         if (is_legacy(tbl->lq_type)) {
2317                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
2318                         /* supp_rates has no CCK bits in A mode */
2319                         rate_scale_index_msk = (u16) (rate_mask &
2320                                 (lq_sta->supp_rates << IWL_FIRST_OFDM_RATE));
2321                 else
2322                         rate_scale_index_msk = (u16) (rate_mask &
2323                                                       lq_sta->supp_rates);
2324
2325         } else
2326                 rate_scale_index_msk = rate_mask;
2327
2328         if (!rate_scale_index_msk)
2329                 rate_scale_index_msk = rate_mask;
2330
2331         if (!((1 << index) & rate_scale_index_msk)) {
2332                 IWL_ERR(priv, "Current Rate is not valid\n");
2333                 if (lq_sta->search_better_tbl) {
2334                         /* revert to active table if search table is not valid*/
2335                         tbl->lq_type = LQ_NONE;
2336                         lq_sta->search_better_tbl = 0;
2337                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2338                         /* get "active" rate info */
2339                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2340                         rs_update_rate_tbl(priv, ctx, lq_sta, tbl,
2341                                            index, is_green);
2342                 }
2343                 return;
2344         }
2345
2346         /* Get expected throughput table and history window for current rate */
2347         if (!tbl->expected_tpt) {
2348                 IWL_ERR(priv, "tbl->expected_tpt is NULL\n");
2349                 return;
2350         }
2351
2352         /* force user max rate if set by user */
2353         if ((lq_sta->max_rate_idx != -1) &&
2354             (lq_sta->max_rate_idx < index)) {
2355                 index = lq_sta->max_rate_idx;
2356                 update_lq = 1;
2357                 window = &(tbl->win[index]);
2358                 goto lq_update;
2359         }
2360
2361         window = &(tbl->win[index]);
2362
2363         /*
2364          * If there is not enough history to calculate actual average
2365          * throughput, keep analyzing results of more tx frames, without
2366          * changing rate or mode (bypass most of the rest of this function).
2367          * Set up new rate table in uCode only if old rate is not supported
2368          * in current association (use new rate found above).
2369          */
2370         fail_count = window->counter - window->success_counter;
2371         if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2372                         (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2373                 IWL_DEBUG_RATE(priv, "LQ: still below TH. succ=%d total=%d "
2374                                "for index %d\n",
2375                                window->success_counter, window->counter, index);
2376
2377                 /* Can't calculate this yet; not enough history */
2378                 window->average_tpt = IWL_INVALID_VALUE;
2379
2380                 /* Should we stay with this modulation mode,
2381                  * or search for a new one? */
2382                 rs_stay_in_table(lq_sta, false);
2383
2384                 goto out;
2385         }
2386         /* Else we have enough samples; calculate estimate of
2387          * actual average throughput */
2388         if (window->average_tpt != ((window->success_ratio *
2389                         tbl->expected_tpt[index] + 64) / 128)) {
2390                 IWL_ERR(priv, "expected_tpt should have been calculated by now\n");
2391                 window->average_tpt = ((window->success_ratio *
2392                                         tbl->expected_tpt[index] + 64) / 128);
2393         }
2394
2395         /* If we are searching for better modulation mode, check success. */
2396         if (lq_sta->search_better_tbl &&
2397             (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI)) {
2398                 /* If good success, continue using the "search" mode;
2399                  * no need to send new link quality command, since we're
2400                  * continuing to use the setup that we've been trying. */
2401                 if (window->average_tpt > lq_sta->last_tpt) {
2402
2403                         IWL_DEBUG_RATE(priv, "LQ: SWITCHING TO NEW TABLE "
2404                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
2405                                         window->success_ratio,
2406                                         window->average_tpt,
2407                                         lq_sta->last_tpt);
2408
2409                         if (!is_legacy(tbl->lq_type))
2410                                 lq_sta->enable_counter = 1;
2411
2412                         /* Swap tables; "search" becomes "active" */
2413                         lq_sta->active_tbl = active_tbl;
2414                         current_tpt = window->average_tpt;
2415
2416                 /* Else poor success; go back to mode in "active" table */
2417                 } else {
2418
2419                         IWL_DEBUG_RATE(priv, "LQ: GOING BACK TO THE OLD TABLE "
2420                                         "suc=%d cur-tpt=%d old-tpt=%d\n",
2421                                         window->success_ratio,
2422                                         window->average_tpt,
2423                                         lq_sta->last_tpt);
2424
2425                         /* Nullify "search" table */
2426                         tbl->lq_type = LQ_NONE;
2427
2428                         /* Revert to "active" table */
2429                         active_tbl = lq_sta->active_tbl;
2430                         tbl = &(lq_sta->lq_info[active_tbl]);
2431
2432                         /* Revert to "active" rate and throughput info */
2433                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2434                         current_tpt = lq_sta->last_tpt;
2435
2436                         /* Need to set up a new rate table in uCode */
2437                         update_lq = 1;
2438                 }
2439
2440                 /* Either way, we've made a decision; modulation mode
2441                  * search is done, allow rate adjustment next time. */
2442                 lq_sta->search_better_tbl = 0;
2443                 done_search = 1;        /* Don't switch modes below! */
2444                 goto lq_update;
2445         }
2446
2447         /* (Else) not in search of better modulation mode, try for better
2448          * starting rate, while staying in this mode. */
2449         high_low = rs_get_adjacent_rate(priv, index, rate_scale_index_msk,
2450                                         tbl->lq_type);
2451         low = high_low & 0xff;
2452         high = (high_low >> 8) & 0xff;
2453
2454         /* If user set max rate, dont allow higher than user constrain */
2455         if ((lq_sta->max_rate_idx != -1) &&
2456             (lq_sta->max_rate_idx < high))
2457                 high = IWL_RATE_INVALID;
2458
2459         sr = window->success_ratio;
2460
2461         /* Collect measured throughputs for current and adjacent rates */
2462         current_tpt = window->average_tpt;
2463         if (low != IWL_RATE_INVALID)
2464                 low_tpt = tbl->win[low].average_tpt;
2465         if (high != IWL_RATE_INVALID)
2466                 high_tpt = tbl->win[high].average_tpt;
2467
2468         scale_action = 0;
2469
2470         /* Too many failures, decrease rate */
2471         if ((sr <= IWL_RATE_DECREASE_TH) || (current_tpt == 0)) {
2472                 IWL_DEBUG_RATE(priv, "decrease rate because of low success_ratio\n");
2473                 scale_action = -1;
2474
2475         /* No throughput measured yet for adjacent rates; try increase. */
2476         } else if ((low_tpt == IWL_INVALID_VALUE) &&
2477                    (high_tpt == IWL_INVALID_VALUE)) {
2478
2479                 if (high != IWL_RATE_INVALID && sr >= IWL_RATE_INCREASE_TH)
2480                         scale_action = 1;
2481                 else if (low != IWL_RATE_INVALID)
2482                         scale_action = 0;
2483         }
2484
2485         /* Both adjacent throughputs are measured, but neither one has better
2486          * throughput; we're using the best rate, don't change it! */
2487         else if ((low_tpt != IWL_INVALID_VALUE) &&
2488                  (high_tpt != IWL_INVALID_VALUE) &&
2489                  (low_tpt < current_tpt) &&
2490                  (high_tpt < current_tpt))
2491                 scale_action = 0;
2492
2493         /* At least one adjacent rate's throughput is measured,
2494          * and may have better performance. */
2495         else {
2496                 /* Higher adjacent rate's throughput is measured */
2497                 if (high_tpt != IWL_INVALID_VALUE) {
2498                         /* Higher rate has better throughput */
2499                         if (high_tpt > current_tpt &&
2500                                         sr >= IWL_RATE_INCREASE_TH) {
2501                                 scale_action = 1;
2502                         } else {
2503                                 scale_action = 0;
2504                         }
2505
2506                 /* Lower adjacent rate's throughput is measured */
2507                 } else if (low_tpt != IWL_INVALID_VALUE) {
2508                         /* Lower rate has better throughput */
2509                         if (low_tpt > current_tpt) {
2510                                 IWL_DEBUG_RATE(priv,
2511                                     "decrease rate because of low tpt\n");
2512                                 scale_action = -1;
2513                         } else if (sr >= IWL_RATE_INCREASE_TH) {
2514                                 scale_action = 1;
2515                         }
2516                 }
2517         }
2518
2519         /* Sanity check; asked for decrease, but success rate or throughput
2520          * has been good at old rate.  Don't change it. */
2521         if ((scale_action == -1) && (low != IWL_RATE_INVALID) &&
2522                     ((sr > IWL_RATE_HIGH_TH) ||
2523                      (current_tpt > (100 * tbl->expected_tpt[low]))))
2524                 scale_action = 0;
2525         if (!iwl_ht_enabled(priv) && !is_legacy(tbl->lq_type))
2526                 scale_action = -1;
2527         if (iwl_tx_ant_restriction(priv) != IWL_ANT_OK_MULTI &&
2528                 (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type)))
2529                 scale_action = -1;
2530
2531         if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2532              (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2533                 if (lq_sta->last_bt_traffic > priv->bt_traffic_load) {
2534                         /*
2535                          * don't set scale_action, don't want to scale up if
2536                          * the rate scale doesn't otherwise think that is a
2537                          * good idea.
2538                          */
2539                 } else if (lq_sta->last_bt_traffic <= priv->bt_traffic_load) {
2540                         scale_action = -1;
2541                 }
2542         }
2543         lq_sta->last_bt_traffic = priv->bt_traffic_load;
2544
2545         if ((priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH) &&
2546              (is_mimo2(tbl->lq_type) || is_mimo3(tbl->lq_type))) {
2547                 /* search for a new modulation */
2548                 rs_stay_in_table(lq_sta, true);
2549                 goto lq_update;
2550         }
2551
2552         switch (scale_action) {
2553         case -1:
2554                 /* Decrease starting rate, update uCode's rate table */
2555                 if (low != IWL_RATE_INVALID) {
2556                         update_lq = 1;
2557                         index = low;
2558                 }
2559
2560                 break;
2561         case 1:
2562                 /* Increase starting rate, update uCode's rate table */
2563                 if (high != IWL_RATE_INVALID) {
2564                         update_lq = 1;
2565                         index = high;
2566                 }
2567
2568                 break;
2569         case 0:
2570                 /* No change */
2571         default:
2572                 break;
2573         }
2574
2575         IWL_DEBUG_RATE(priv, "choose rate scale index %d action %d low %d "
2576                     "high %d type %d\n",
2577                      index, scale_action, low, high, tbl->lq_type);
2578
2579 lq_update:
2580         /* Replace uCode's rate table for the destination station. */
2581         if (update_lq)
2582                 rs_update_rate_tbl(priv, ctx, lq_sta, tbl, index, is_green);
2583
2584         if (iwl_tx_ant_restriction(priv) == IWL_ANT_OK_MULTI) {
2585                 /* Should we stay with this modulation mode,
2586                  * or search for a new one? */
2587           rs_stay_in_table(lq_sta, false);
2588         }
2589         /*
2590          * Search for new modulation mode if we're:
2591          * 1)  Not changing rates right now
2592          * 2)  Not just finishing up a search
2593          * 3)  Allowing a new search
2594          */
2595         if (!update_lq && !done_search && !lq_sta->stay_in_tbl && window->counter) {
2596                 /* Save current throughput to compare with "search" throughput*/
2597                 lq_sta->last_tpt = current_tpt;
2598
2599                 /* Select a new "search" modulation mode to try.
2600                  * If one is found, set up the new "search" table. */
2601                 if (is_legacy(tbl->lq_type))
2602                         rs_move_legacy_other(priv, lq_sta, conf, sta, index);
2603                 else if (is_siso(tbl->lq_type))
2604                         rs_move_siso_to_other(priv, lq_sta, conf, sta, index);
2605                 else if (is_mimo2(tbl->lq_type))
2606                         rs_move_mimo2_to_other(priv, lq_sta, conf, sta, index);
2607                 else
2608                         rs_move_mimo3_to_other(priv, lq_sta, conf, sta, index);
2609
2610                 /* If new "search" mode was selected, set up in uCode table */
2611                 if (lq_sta->search_better_tbl) {
2612                         /* Access the "search" table, clear its history. */
2613                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2614                         for (i = 0; i < IWL_RATE_COUNT; i++)
2615                                 rs_rate_scale_clear_window(&(tbl->win[i]));
2616
2617                         /* Use new "search" start rate */
2618                         index = iwl_hwrate_to_plcp_idx(tbl->current_rate);
2619
2620                         IWL_DEBUG_RATE(priv, "Switch current  mcs: %X index: %d\n",
2621                                      tbl->current_rate, index);
2622                         rs_fill_link_cmd(priv, lq_sta, tbl->current_rate);
2623                         iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_ASYNC, false);
2624                 } else
2625                         done_search = 1;
2626         }
2627
2628         if (done_search && !lq_sta->stay_in_tbl) {
2629                 /* If the "active" (non-search) mode was legacy,
2630                  * and we've tried switching antennas,
2631                  * but we haven't been able to try HT modes (not available),
2632                  * stay with best antenna legacy modulation for a while
2633                  * before next round of mode comparisons. */
2634                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2635                 if (is_legacy(tbl1->lq_type) && !conf_is_ht(conf) &&
2636                     lq_sta->action_counter > tbl1->max_search) {
2637                         IWL_DEBUG_RATE(priv, "LQ: STAY in legacy table\n");
2638                         rs_set_stay_in_table(priv, 1, lq_sta);
2639                 }
2640
2641                 /* If we're in an HT mode, and all 3 mode switch actions
2642                  * have been tried and compared, stay in this best modulation
2643                  * mode for a while before next round of mode comparisons. */
2644                 if (lq_sta->enable_counter &&
2645                     (lq_sta->action_counter >= tbl1->max_search) &&
2646                     iwl_ht_enabled(priv)) {
2647                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2648                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2649                             (tid != MAX_TID_COUNT)) {
2650                                 tid_data =
2651                                    &priv->stations[lq_sta->lq.sta_id].tid[tid];
2652                                 if (tid_data->agg.state == IWL_AGG_OFF) {
2653                                         IWL_DEBUG_RATE(priv,
2654                                                        "try to aggregate tid %d\n",
2655                                                        tid);
2656                                         rs_tl_turn_on_agg(priv, tid,
2657                                                           lq_sta, sta);
2658                                 }
2659                         }
2660                         rs_set_stay_in_table(priv, 0, lq_sta);
2661                 }
2662         }
2663
2664 out:
2665         tbl->current_rate = rate_n_flags_from_tbl(priv, tbl, index, is_green);
2666         i = index;
2667         lq_sta->last_txrate_idx = i;
2668 }
2669
2670 /**
2671  * rs_initialize_lq - Initialize a station's hardware rate table
2672  *
2673  * The uCode's station table contains a table of fallback rates
2674  * for automatic fallback during transmission.
2675  *
2676  * NOTE: This sets up a default set of values.  These will be replaced later
2677  *       if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2678  *       rc80211_simple.
2679  *
2680  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2681  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2682  *       which requires station table entry to exist).
2683  */
2684 static void rs_initialize_lq(struct iwl_priv *priv,
2685                              struct ieee80211_conf *conf,
2686                              struct ieee80211_sta *sta,
2687                              struct iwl_lq_sta *lq_sta)
2688 {
2689         struct iwl_scale_tbl_info *tbl;
2690         int rate_idx;
2691         int i;
2692         u32 rate;
2693         u8 use_green = rs_use_green(sta);
2694         u8 active_tbl = 0;
2695         u8 valid_tx_ant;
2696         struct iwl_station_priv *sta_priv;
2697         struct iwl_rxon_context *ctx;
2698
2699         if (!sta || !lq_sta)
2700                 return;
2701
2702         sta_priv = (void *)sta->drv_priv;
2703         ctx = sta_priv->common.ctx;
2704
2705         i = lq_sta->last_txrate_idx;
2706
2707         valid_tx_ant = priv->hw_params.valid_tx_ant;
2708
2709         if (!lq_sta->search_better_tbl)
2710                 active_tbl = lq_sta->active_tbl;
2711         else
2712                 active_tbl = 1 - lq_sta->active_tbl;
2713
2714         tbl = &(lq_sta->lq_info[active_tbl]);
2715
2716         if ((i < 0) || (i >= IWL_RATE_COUNT))
2717                 i = 0;
2718
2719         rate = iwl_rates[i].plcp;
2720         tbl->ant_type = first_antenna(valid_tx_ant);
2721         rate |= tbl->ant_type << RATE_MCS_ANT_POS;
2722
2723         if (i >= IWL_FIRST_CCK_RATE && i <= IWL_LAST_CCK_RATE)
2724                 rate |= RATE_MCS_CCK_MSK;
2725
2726         rs_get_tbl_info_from_mcs(rate, priv->band, tbl, &rate_idx);
2727         if (!rs_is_valid_ant(valid_tx_ant, tbl->ant_type))
2728             rs_toggle_antenna(valid_tx_ant, &rate, tbl);
2729
2730         rate = rate_n_flags_from_tbl(priv, tbl, rate_idx, use_green);
2731         tbl->current_rate = rate;
2732         rs_set_expected_tpt_table(lq_sta, tbl);
2733         rs_fill_link_cmd(NULL, lq_sta, rate);
2734         priv->stations[lq_sta->lq.sta_id].lq = &lq_sta->lq;
2735         iwl_send_lq_cmd(priv, ctx, &lq_sta->lq, CMD_SYNC, true);
2736 }
2737
2738 static void rs_get_rate(void *priv_r, struct ieee80211_sta *sta, void *priv_sta,
2739                         struct ieee80211_tx_rate_control *txrc)
2740 {
2741
2742         struct sk_buff *skb = txrc->skb;
2743         struct ieee80211_supported_band *sband = txrc->sband;
2744         struct iwl_priv *priv __maybe_unused = (struct iwl_priv *)priv_r;
2745         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2746         struct iwl_lq_sta *lq_sta = priv_sta;
2747         int rate_idx;
2748
2749         IWL_DEBUG_RATE_LIMIT(priv, "rate scale calculate new rate for skb\n");
2750
2751         /* Get max rate if user set max rate */
2752         if (lq_sta) {
2753                 lq_sta->max_rate_idx = txrc->max_rate_idx;
2754                 if ((sband->band == IEEE80211_BAND_5GHZ) &&
2755                     (lq_sta->max_rate_idx != -1))
2756                         lq_sta->max_rate_idx += IWL_FIRST_OFDM_RATE;
2757                 if ((lq_sta->max_rate_idx < 0) ||
2758                     (lq_sta->max_rate_idx >= IWL_RATE_COUNT))
2759                         lq_sta->max_rate_idx = -1;
2760         }
2761
2762         /* Treat uninitialized rate scaling data same as non-existing. */
2763         if (lq_sta && !lq_sta->drv) {
2764                 IWL_DEBUG_RATE(priv, "Rate scaling not initialized yet.\n");
2765                 priv_sta = NULL;
2766         }
2767
2768         /* Send management frames and NO_ACK data using lowest rate. */
2769         if (rate_control_send_low(sta, priv_sta, txrc))
2770                 return;
2771
2772         rate_idx  = lq_sta->last_txrate_idx;
2773
2774         if (lq_sta->last_rate_n_flags & RATE_MCS_HT_MSK) {
2775                 rate_idx -= IWL_FIRST_OFDM_RATE;
2776                 /* 6M and 9M shared same MCS index */
2777                 rate_idx = (rate_idx > 0) ? (rate_idx - 1) : 0;
2778                 if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2779                     IWL_RATE_MIMO3_6M_PLCP)
2780                         rate_idx = rate_idx + (2 * MCS_INDEX_PER_STREAM);
2781                 else if (rs_extract_rate(lq_sta->last_rate_n_flags) >=
2782                          IWL_RATE_MIMO2_6M_PLCP)
2783                         rate_idx = rate_idx + MCS_INDEX_PER_STREAM;
2784                 info->control.rates[0].flags = IEEE80211_TX_RC_MCS;
2785                 if (lq_sta->last_rate_n_flags & RATE_MCS_SGI_MSK)
2786                         info->control.rates[0].flags |= IEEE80211_TX_RC_SHORT_GI;
2787                 if (lq_sta->last_rate_n_flags & RATE_MCS_DUP_MSK)
2788                         info->control.rates[0].flags |= IEEE80211_TX_RC_DUP_DATA;
2789                 if (lq_sta->last_rate_n_flags & RATE_MCS_HT40_MSK)
2790                         info->control.rates[0].flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
2791                 if (lq_sta->last_rate_n_flags & RATE_MCS_GF_MSK)
2792                         info->control.rates[0].flags |= IEEE80211_TX_RC_GREEN_FIELD;
2793         } else {
2794                 /* Check for invalid rates */
2795                 if ((rate_idx < 0) || (rate_idx >= IWL_RATE_COUNT_LEGACY) ||
2796                                 ((sband->band == IEEE80211_BAND_5GHZ) &&
2797                                  (rate_idx < IWL_FIRST_OFDM_RATE)))
2798                         rate_idx = rate_lowest_index(sband, sta);
2799                 /* On valid 5 GHz rate, adjust index */
2800                 else if (sband->band == IEEE80211_BAND_5GHZ)
2801                         rate_idx -= IWL_FIRST_OFDM_RATE;
2802                 info->control.rates[0].flags = 0;
2803         }
2804         info->control.rates[0].idx = rate_idx;
2805
2806 }
2807
2808 static void *rs_alloc_sta(void *priv_rate, struct ieee80211_sta *sta,
2809                           gfp_t gfp)
2810 {
2811         struct iwl_station_priv *sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2812         struct iwl_priv *priv;
2813
2814         priv = (struct iwl_priv *)priv_rate;
2815         IWL_DEBUG_RATE(priv, "create station rate scale window\n");
2816
2817         return &sta_priv->lq_sta;
2818 }
2819
2820 /*
2821  * Called after adding a new station to initialize rate scaling
2822  */
2823 void iwl_rs_rate_init(struct iwl_priv *priv, struct ieee80211_sta *sta, u8 sta_id)
2824 {
2825         int i, j;
2826         struct ieee80211_hw *hw = priv->hw;
2827         struct ieee80211_conf *conf = &priv->hw->conf;
2828         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2829         struct iwl_station_priv *sta_priv;
2830         struct iwl_lq_sta *lq_sta;
2831         struct ieee80211_supported_band *sband;
2832
2833         sta_priv = (struct iwl_station_priv *) sta->drv_priv;
2834         lq_sta = &sta_priv->lq_sta;
2835         sband = hw->wiphy->bands[conf->channel->band];
2836
2837
2838         lq_sta->lq.sta_id = sta_id;
2839
2840         for (j = 0; j < LQ_SIZE; j++)
2841                 for (i = 0; i < IWL_RATE_COUNT; i++)
2842                         rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2843
2844         lq_sta->flush_timer = 0;
2845         lq_sta->supp_rates = sta->supp_rates[sband->band];
2846         for (j = 0; j < LQ_SIZE; j++)
2847                 for (i = 0; i < IWL_RATE_COUNT; i++)
2848                         rs_rate_scale_clear_window(&lq_sta->lq_info[j].win[i]);
2849
2850         IWL_DEBUG_RATE(priv, "LQ: *** rate scale station global init for station %d ***\n",
2851                        sta_id);
2852         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2853          * the lowest or the highest rate.. Could consider using RSSI from
2854          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2855          * after assoc.. */
2856
2857         lq_sta->is_dup = 0;
2858         lq_sta->max_rate_idx = -1;
2859         lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2860         lq_sta->is_green = rs_use_green(sta);
2861         lq_sta->active_legacy_rate = priv->active_rate & ~(0x1000);
2862         lq_sta->band = priv->band;
2863         /*
2864          * active_siso_rate mask includes 9 MBits (bit 5), and CCK (bits 0-3),
2865          * supp_rates[] does not; shift to convert format, force 9 MBits off.
2866          */
2867         lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2868         lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2869         lq_sta->active_siso_rate &= ~((u16)0x2);
2870         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2871
2872         /* Same here */
2873         lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2874         lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2875         lq_sta->active_mimo2_rate &= ~((u16)0x2);
2876         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2877
2878         lq_sta->active_mimo3_rate = ht_cap->mcs.rx_mask[2] << 1;
2879         lq_sta->active_mimo3_rate |= ht_cap->mcs.rx_mask[2] & 0x1;
2880         lq_sta->active_mimo3_rate &= ~((u16)0x2);
2881         lq_sta->active_mimo3_rate <<= IWL_FIRST_OFDM_RATE;
2882
2883         IWL_DEBUG_RATE(priv, "SISO-RATE=%X MIMO2-RATE=%X MIMO3-RATE=%X\n",
2884                      lq_sta->active_siso_rate,
2885                      lq_sta->active_mimo2_rate,
2886                      lq_sta->active_mimo3_rate);
2887
2888         /* These values will be overridden later */
2889         lq_sta->lq.general_params.single_stream_ant_msk =
2890                 first_antenna(priv->hw_params.valid_tx_ant);
2891         lq_sta->lq.general_params.dual_stream_ant_msk =
2892                 priv->hw_params.valid_tx_ant &
2893                 ~first_antenna(priv->hw_params.valid_tx_ant);
2894         if (!lq_sta->lq.general_params.dual_stream_ant_msk) {
2895                 lq_sta->lq.general_params.dual_stream_ant_msk = ANT_AB;
2896         } else if (num_of_ant(priv->hw_params.valid_tx_ant) == 2) {
2897                 lq_sta->lq.general_params.dual_stream_ant_msk =
2898                         priv->hw_params.valid_tx_ant;
2899         }
2900
2901         /* as default allow aggregation for all tids */
2902         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2903         lq_sta->drv = priv;
2904
2905         /* Set last_txrate_idx to lowest rate */
2906         lq_sta->last_txrate_idx = rate_lowest_index(sband, sta);
2907         if (sband->band == IEEE80211_BAND_5GHZ)
2908                 lq_sta->last_txrate_idx += IWL_FIRST_OFDM_RATE;
2909         lq_sta->is_agg = 0;
2910 #ifdef CONFIG_IWLWIFI_DEVICE_SVTOOL
2911         priv->tm_fixed_rate = 0;
2912 #endif
2913 #ifdef CONFIG_MAC80211_DEBUGFS
2914         lq_sta->dbg_fixed_rate = 0;
2915 #endif
2916
2917         rs_initialize_lq(priv, conf, sta, lq_sta);
2918 }
2919
2920 static void rs_fill_link_cmd(struct iwl_priv *priv,
2921                              struct iwl_lq_sta *lq_sta, u32 new_rate)
2922 {
2923         struct iwl_scale_tbl_info tbl_type;
2924         int index = 0;
2925         int rate_idx;
2926         int repeat_rate = 0;
2927         u8 ant_toggle_cnt = 0;
2928         u8 use_ht_possible = 1;
2929         u8 valid_tx_ant = 0;
2930         struct iwl_station_priv *sta_priv =
2931                 container_of(lq_sta, struct iwl_station_priv, lq_sta);
2932         struct iwl_link_quality_cmd *lq_cmd = &lq_sta->lq;
2933
2934         /* Override starting rate (index 0) if needed for debug purposes */
2935         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2936
2937         /* Interpret new_rate (rate_n_flags) */
2938         rs_get_tbl_info_from_mcs(new_rate, lq_sta->band,
2939                                   &tbl_type, &rate_idx);
2940
2941         if (priv && priv->bt_full_concurrent) {
2942                 /* 1x1 only */
2943                 tbl_type.ant_type =
2944                         first_antenna(priv->hw_params.valid_tx_ant);
2945         }
2946
2947         /* How many times should we repeat the initial rate? */
2948         if (is_legacy(tbl_type.lq_type)) {
2949                 ant_toggle_cnt = 1;
2950                 repeat_rate = IWL_NUMBER_TRY;
2951         } else {
2952                 repeat_rate = min(IWL_HT_NUMBER_TRY,
2953                                   LINK_QUAL_AGG_DISABLE_START_DEF - 1);
2954         }
2955
2956         lq_cmd->general_params.mimo_delimiter =
2957                         is_mimo(tbl_type.lq_type) ? 1 : 0;
2958
2959         /* Fill 1st table entry (index 0) */
2960         lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
2961
2962         if (num_of_ant(tbl_type.ant_type) == 1) {
2963                 lq_cmd->general_params.single_stream_ant_msk =
2964                                                 tbl_type.ant_type;
2965         } else if (num_of_ant(tbl_type.ant_type) == 2) {
2966                 lq_cmd->general_params.dual_stream_ant_msk =
2967                                                 tbl_type.ant_type;
2968         } /* otherwise we don't modify the existing value */
2969
2970         index++;
2971         repeat_rate--;
2972         if (priv) {
2973                 if (priv->bt_full_concurrent)
2974                         valid_tx_ant = ANT_A;
2975                 else
2976                         valid_tx_ant = priv->hw_params.valid_tx_ant;
2977         }
2978
2979         /* Fill rest of rate table */
2980         while (index < LINK_QUAL_MAX_RETRY_NUM) {
2981                 /* Repeat initial/next rate.
2982                  * For legacy IWL_NUMBER_TRY == 1, this loop will not execute.
2983                  * For HT IWL_HT_NUMBER_TRY == 3, this executes twice. */
2984                 while (repeat_rate > 0 && (index < LINK_QUAL_MAX_RETRY_NUM)) {
2985                         if (is_legacy(tbl_type.lq_type)) {
2986                                 if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
2987                                         ant_toggle_cnt++;
2988                                 else if (priv &&
2989                                          rs_toggle_antenna(valid_tx_ant,
2990                                                         &new_rate, &tbl_type))
2991                                         ant_toggle_cnt = 1;
2992                         }
2993
2994                         /* Override next rate if needed for debug purposes */
2995                         rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
2996
2997                         /* Fill next table entry */
2998                         lq_cmd->rs_table[index].rate_n_flags =
2999                                         cpu_to_le32(new_rate);
3000                         repeat_rate--;
3001                         index++;
3002                 }
3003
3004                 rs_get_tbl_info_from_mcs(new_rate, lq_sta->band, &tbl_type,
3005                                                 &rate_idx);
3006
3007                 if (priv && priv->bt_full_concurrent) {
3008                         /* 1x1 only */
3009                         tbl_type.ant_type =
3010                                 first_antenna(priv->hw_params.valid_tx_ant);
3011                 }
3012
3013                 /* Indicate to uCode which entries might be MIMO.
3014                  * If initial rate was MIMO, this will finally end up
3015                  * as (IWL_HT_NUMBER_TRY * 2), after 2nd pass, otherwise 0. */
3016                 if (is_mimo(tbl_type.lq_type))
3017                         lq_cmd->general_params.mimo_delimiter = index;
3018
3019                 /* Get next rate */
3020                 new_rate = rs_get_lower_rate(lq_sta, &tbl_type, rate_idx,
3021                                              use_ht_possible);
3022
3023                 /* How many times should we repeat the next rate? */
3024                 if (is_legacy(tbl_type.lq_type)) {
3025                         if (ant_toggle_cnt < NUM_TRY_BEFORE_ANT_TOGGLE)
3026                                 ant_toggle_cnt++;
3027                         else if (priv &&
3028                                  rs_toggle_antenna(valid_tx_ant,
3029                                                    &new_rate, &tbl_type))
3030                                 ant_toggle_cnt = 1;
3031
3032                         repeat_rate = IWL_NUMBER_TRY;
3033                 } else {
3034                         repeat_rate = IWL_HT_NUMBER_TRY;
3035                 }
3036
3037                 /* Don't allow HT rates after next pass.
3038                  * rs_get_lower_rate() will change type to LQ_A or LQ_G. */
3039                 use_ht_possible = 0;
3040
3041                 /* Override next rate if needed for debug purposes */
3042                 rs_dbgfs_set_mcs(lq_sta, &new_rate, index);
3043
3044                 /* Fill next table entry */
3045                 lq_cmd->rs_table[index].rate_n_flags = cpu_to_le32(new_rate);
3046
3047                 index++;
3048                 repeat_rate--;
3049         }
3050
3051         lq_cmd->agg_params.agg_frame_cnt_limit =
3052                 sta_priv->max_agg_bufsize ?: LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3053         lq_cmd->agg_params.agg_dis_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
3054
3055         lq_cmd->agg_params.agg_time_limit =
3056                 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
3057         /*
3058          * overwrite if needed, pass aggregation time limit
3059          * to uCode in uSec
3060          */
3061         if (priv && priv->cfg->bt_params &&
3062             priv->cfg->bt_params->agg_time_limit &&
3063             priv->bt_traffic_load >= IWL_BT_COEX_TRAFFIC_LOAD_HIGH)
3064                 lq_cmd->agg_params.agg_time_limit =
3065                         cpu_to_le16(priv->cfg->bt_params->agg_time_limit);
3066 }
3067
3068 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3069 {
3070         return hw->priv;
3071 }
3072 /* rate scale requires free function to be implemented */
3073 static void rs_free(void *priv_rate)
3074 {
3075         return;
3076 }
3077
3078 static void rs_free_sta(void *priv_r, struct ieee80211_sta *sta,
3079                         void *priv_sta)
3080 {
3081         struct iwl_priv *priv __maybe_unused = priv_r;
3082
3083         IWL_DEBUG_RATE(priv, "enter\n");
3084         IWL_DEBUG_RATE(priv, "leave\n");
3085 }
3086
3087 #ifdef CONFIG_MAC80211_DEBUGFS
3088 static int open_file_generic(struct inode *inode, struct file *file)
3089 {
3090         file->private_data = inode->i_private;
3091         return 0;
3092 }
3093 static void rs_dbgfs_set_mcs(struct iwl_lq_sta *lq_sta,
3094                              u32 *rate_n_flags, int index)
3095 {
3096         struct iwl_priv *priv;
3097         u8 valid_tx_ant;
3098         u8 ant_sel_tx;
3099
3100         priv = lq_sta->drv;
3101         valid_tx_ant = priv->hw_params.valid_tx_ant;
3102         if (lq_sta->dbg_fixed_rate) {
3103                 ant_sel_tx =
3104                   ((lq_sta->dbg_fixed_rate & RATE_MCS_ANT_ABC_MSK)
3105                   >> RATE_MCS_ANT_POS);
3106                 if ((valid_tx_ant & ant_sel_tx) == ant_sel_tx) {
3107                         *rate_n_flags = lq_sta->dbg_fixed_rate;
3108                         IWL_DEBUG_RATE(priv, "Fixed rate ON\n");
3109                 } else {
3110                         lq_sta->dbg_fixed_rate = 0;
3111                         IWL_ERR(priv,
3112                             "Invalid antenna selection 0x%X, Valid is 0x%X\n",
3113                             ant_sel_tx, valid_tx_ant);
3114                         IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3115                 }
3116         } else {
3117                 IWL_DEBUG_RATE(priv, "Fixed rate OFF\n");
3118         }
3119 }
3120
3121 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3122                         const char __user *user_buf, size_t count, loff_t *ppos)
3123 {
3124         struct iwl_lq_sta *lq_sta = file->private_data;
3125         struct iwl_priv *priv;
3126         char buf[64];
3127         size_t buf_size;
3128         u32 parsed_rate;
3129
3130
3131         priv = lq_sta->drv;
3132         memset(buf, 0, sizeof(buf));
3133         buf_size = min(count, sizeof(buf) -  1);
3134         if (copy_from_user(buf, user_buf, buf_size))
3135                 return -EFAULT;
3136
3137         if (sscanf(buf, "%x", &parsed_rate) == 1)
3138                 lq_sta->dbg_fixed_rate = parsed_rate;
3139         else
3140                 lq_sta->dbg_fixed_rate = 0;
3141
3142         rs_program_fix_rate(priv, lq_sta);
3143
3144         return count;
3145 }
3146
3147 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3148                         char __user *user_buf, size_t count, loff_t *ppos)
3149 {
3150         char *buff;
3151         int desc = 0;
3152         int i = 0;
3153         int index = 0;
3154         ssize_t ret;
3155
3156         struct iwl_lq_sta *lq_sta = file->private_data;
3157         struct iwl_priv *priv;
3158         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3159
3160         priv = lq_sta->drv;
3161         buff = kmalloc(1024, GFP_KERNEL);
3162         if (!buff)
3163                 return -ENOMEM;
3164
3165         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3166         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",
3167                         lq_sta->total_failed, lq_sta->total_success,
3168                         lq_sta->active_legacy_rate);
3169         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3170                         lq_sta->dbg_fixed_rate);
3171         desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3172             (priv->hw_params.valid_tx_ant & ANT_A) ? "ANT_A," : "",
3173             (priv->hw_params.valid_tx_ant & ANT_B) ? "ANT_B," : "",
3174             (priv->hw_params.valid_tx_ant & ANT_C) ? "ANT_C" : "");
3175         desc += sprintf(buff+desc, "lq type %s\n",
3176            (is_legacy(tbl->lq_type)) ? "legacy" : "HT");
3177         if (is_Ht(tbl->lq_type)) {
3178                 desc += sprintf(buff+desc, " %s",
3179                    (is_siso(tbl->lq_type)) ? "SISO" :
3180                    ((is_mimo2(tbl->lq_type)) ? "MIMO2" : "MIMO3"));
3181                    desc += sprintf(buff+desc, " %s",
3182                    (tbl->is_ht40) ? "40MHz" : "20MHz");
3183                    desc += sprintf(buff+desc, " %s %s %s\n", (tbl->is_SGI) ? "SGI" : "",
3184                    (lq_sta->is_green) ? "GF enabled" : "",
3185                    (lq_sta->is_agg) ? "AGG on" : "");
3186         }
3187         desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3188                 lq_sta->last_rate_n_flags);
3189         desc += sprintf(buff+desc, "general:"
3190                 "flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",
3191                 lq_sta->lq.general_params.flags,
3192                 lq_sta->lq.general_params.mimo_delimiter,
3193                 lq_sta->lq.general_params.single_stream_ant_msk,
3194                 lq_sta->lq.general_params.dual_stream_ant_msk);
3195
3196         desc += sprintf(buff+desc, "agg:"
3197                         "time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3198                         le16_to_cpu(lq_sta->lq.agg_params.agg_time_limit),
3199                         lq_sta->lq.agg_params.agg_dis_start_th,
3200                         lq_sta->lq.agg_params.agg_frame_cnt_limit);
3201
3202         desc += sprintf(buff+desc,
3203                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3204                         lq_sta->lq.general_params.start_rate_index[0],
3205                         lq_sta->lq.general_params.start_rate_index[1],
3206                         lq_sta->lq.general_params.start_rate_index[2],
3207                         lq_sta->lq.general_params.start_rate_index[3]);
3208
3209         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3210                 index = iwl_hwrate_to_plcp_idx(
3211                         le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags));
3212                 if (is_legacy(tbl->lq_type)) {
3213                         desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps\n",
3214                                 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3215                                 iwl_rate_mcs[index].mbps);
3216                 } else {
3217                         desc += sprintf(buff+desc, " rate[%d] 0x%X %smbps (%s)\n",
3218                                 i, le32_to_cpu(lq_sta->lq.rs_table[i].rate_n_flags),
3219                                 iwl_rate_mcs[index].mbps, iwl_rate_mcs[index].mcs);
3220                 }
3221         }
3222
3223         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3224         kfree(buff);
3225         return ret;
3226 }
3227
3228 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3229         .write = rs_sta_dbgfs_scale_table_write,
3230         .read = rs_sta_dbgfs_scale_table_read,
3231         .open = open_file_generic,
3232         .llseek = default_llseek,
3233 };
3234 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3235                         char __user *user_buf, size_t count, loff_t *ppos)
3236 {
3237         char *buff;
3238         int desc = 0;
3239         int i, j;
3240         ssize_t ret;
3241
3242         struct iwl_lq_sta *lq_sta = file->private_data;
3243
3244         buff = kmalloc(1024, GFP_KERNEL);
3245         if (!buff)
3246                 return -ENOMEM;
3247
3248         for (i = 0; i < LQ_SIZE; i++) {
3249                 desc += sprintf(buff+desc,
3250                                 "%s type=%d SGI=%d HT40=%d DUP=%d GF=%d\n"
3251                                 "rate=0x%X\n",
3252                                 lq_sta->active_tbl == i ? "*" : "x",
3253                                 lq_sta->lq_info[i].lq_type,
3254                                 lq_sta->lq_info[i].is_SGI,
3255                                 lq_sta->lq_info[i].is_ht40,
3256                                 lq_sta->lq_info[i].is_dup,
3257                                 lq_sta->is_green,
3258                                 lq_sta->lq_info[i].current_rate);
3259                 for (j = 0; j < IWL_RATE_COUNT; j++) {
3260                         desc += sprintf(buff+desc,
3261                                 "counter=%d success=%d %%=%d\n",
3262                                 lq_sta->lq_info[i].win[j].counter,
3263                                 lq_sta->lq_info[i].win[j].success_counter,
3264                                 lq_sta->lq_info[i].win[j].success_ratio);
3265                 }
3266         }
3267         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3268         kfree(buff);
3269         return ret;
3270 }
3271
3272 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3273         .read = rs_sta_dbgfs_stats_table_read,
3274         .open = open_file_generic,
3275         .llseek = default_llseek,
3276 };
3277
3278 static ssize_t rs_sta_dbgfs_rate_scale_data_read(struct file *file,
3279                         char __user *user_buf, size_t count, loff_t *ppos)
3280 {
3281         struct iwl_lq_sta *lq_sta = file->private_data;
3282         struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3283         char buff[120];
3284         int desc = 0;
3285
3286         if (is_Ht(tbl->lq_type))
3287                 desc += sprintf(buff+desc,
3288                                 "Bit Rate= %d Mb/s\n",
3289                                 tbl->expected_tpt[lq_sta->last_txrate_idx]);
3290         else
3291                 desc += sprintf(buff+desc,
3292                                 "Bit Rate= %d Mb/s\n",
3293                                 iwl_rates[lq_sta->last_txrate_idx].ieee >> 1);
3294
3295         return simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3296 }
3297
3298 static const struct file_operations rs_sta_dbgfs_rate_scale_data_ops = {
3299         .read = rs_sta_dbgfs_rate_scale_data_read,
3300         .open = open_file_generic,
3301         .llseek = default_llseek,
3302 };
3303
3304 static void rs_add_debugfs(void *priv, void *priv_sta,
3305                                         struct dentry *dir)
3306 {
3307         struct iwl_lq_sta *lq_sta = priv_sta;
3308         lq_sta->rs_sta_dbgfs_scale_table_file =
3309                 debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3310                                 lq_sta, &rs_sta_dbgfs_scale_table_ops);
3311         lq_sta->rs_sta_dbgfs_stats_table_file =
3312                 debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3313                         lq_sta, &rs_sta_dbgfs_stats_table_ops);
3314         lq_sta->rs_sta_dbgfs_rate_scale_data_file =
3315                 debugfs_create_file("rate_scale_data", S_IRUSR, dir,
3316                         lq_sta, &rs_sta_dbgfs_rate_scale_data_ops);
3317         lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file =
3318                 debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3319                 &lq_sta->tx_agg_tid_en);
3320
3321 }
3322
3323 static void rs_remove_debugfs(void *priv, void *priv_sta)
3324 {
3325         struct iwl_lq_sta *lq_sta = priv_sta;
3326         debugfs_remove(lq_sta->rs_sta_dbgfs_scale_table_file);
3327         debugfs_remove(lq_sta->rs_sta_dbgfs_stats_table_file);
3328         debugfs_remove(lq_sta->rs_sta_dbgfs_rate_scale_data_file);
3329         debugfs_remove(lq_sta->rs_sta_dbgfs_tx_agg_tid_en_file);
3330 }
3331 #endif
3332
3333 /*
3334  * Initialization of rate scaling information is done by driver after
3335  * the station is added. Since mac80211 calls this function before a
3336  * station is added we ignore it.
3337  */
3338 static void rs_rate_init_stub(void *priv_r, struct ieee80211_supported_band *sband,
3339                          struct ieee80211_sta *sta, void *priv_sta)
3340 {
3341 }
3342 static struct rate_control_ops rs_ops = {
3343         .module = NULL,
3344         .name = RS_NAME,
3345         .tx_status = rs_tx_status,
3346         .get_rate = rs_get_rate,
3347         .rate_init = rs_rate_init_stub,
3348         .alloc = rs_alloc,
3349         .free = rs_free,
3350         .alloc_sta = rs_alloc_sta,
3351         .free_sta = rs_free_sta,
3352 #ifdef CONFIG_MAC80211_DEBUGFS
3353         .add_sta_debugfs = rs_add_debugfs,
3354         .remove_sta_debugfs = rs_remove_debugfs,
3355 #endif
3356 };
3357
3358 int iwlagn_rate_control_register(void)
3359 {
3360         return ieee80211_rate_control_register(&rs_ops);
3361 }
3362
3363 void iwlagn_rate_control_unregister(void)
3364 {
3365         ieee80211_rate_control_unregister(&rs_ops);
3366 }
3367