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

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