drivers/net/wireless/intel/iwlwifi/mvm/rs.c

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
   4  * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
   5  * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
   6  * Copyright(c) 2018 Intel Corporation
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of version 2 of the GNU General Public License as
  10  * published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but WITHOUT
  13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  15  * more details.
  16  *
  17  * The full GNU General Public License is included in this distribution in the
  18  * file called LICENSE.
  19  *
  20  * Contact Information:
  21  *  Intel Linux Wireless <linuxwifi@intel.com>
  22  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  23  *
  24  *****************************************************************************/
  25 #include <linux/kernel.h>
  26 #include <linux/skbuff.h>
  27 #include <linux/slab.h>
  28 #include <net/mac80211.h>
  29
  30 #include <linux/netdevice.h>
  31 #include <linux/etherdevice.h>
  32 #include <linux/delay.h>
  33
  34 #include <linux/workqueue.h>
  35 #include "rs.h"
  36 #include "fw-api.h"
  37 #include "sta.h"
  38 #include "iwl-op-mode.h"
  39 #include "mvm.h"
  40 #include "debugfs.h"
  41
  42 #define IWL_RATE_MAX_WINDOW             62      /* # tx in history window */
  43
  44 /* Calculations of success ratio are done in fixed point where 12800 is 100%.
  45  * Use this macro when dealing with thresholds consts set as a percentage
  46  */
  47 #define RS_PERCENT(x) (128 * x)
  48
  49 static u8 rs_ht_to_legacy[] = {
  50         [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX,
  51         [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX,
  52         [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX,
  53         [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX,
  54         [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX,
  55         [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX,
  56         [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX,
  57         [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX,
  58         [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX,
  59         [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX,
  60 };
  61
  62 static const u8 ant_toggle_lookup[] = {
  63         [ANT_NONE] = ANT_NONE,
  64         [ANT_A] = ANT_B,
  65         [ANT_B] = ANT_A,
  66         [ANT_AB] = ANT_AB,
  67 };
  68
  69 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn)                           \
  70         [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP,             \
  71                                     IWL_RATE_HT_SISO_MCS_##s##_PLCP,  \
  72                                     IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
  73                                     IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
  74                                     IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\
  75                                     IWL_RATE_##rp##M_INDEX,           \
  76                                     IWL_RATE_##rn##M_INDEX }
  77
  78 #define IWL_DECLARE_MCS_RATE(s)                                           \
  79         [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP,                \
  80                                        IWL_RATE_HT_SISO_MCS_##s##_PLCP,   \
  81                                        IWL_RATE_HT_MIMO2_MCS_##s##_PLCP,  \
  82                                        IWL_RATE_VHT_SISO_MCS_##s##_PLCP,  \
  83                                        IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \
  84                                        IWL_RATE_INVM_INDEX,               \
  85                                        IWL_RATE_INVM_INDEX }
  86
  87 /*
  88  * Parameter order:
  89  *   rate, ht rate, prev rate, next rate
  90  *
  91  * If there isn't a valid next or previous rate then INV is used which
  92  * maps to IWL_RATE_INVALID
  93  *
  94  */
  95 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
  96         IWL_DECLARE_RATE_INFO(1, INV, INV, 2),   /*  1mbps */
  97         IWL_DECLARE_RATE_INFO(2, INV, 1, 5),     /*  2mbps */
  98         IWL_DECLARE_RATE_INFO(5, INV, 2, 11),    /*5.5mbps */
  99         IWL_DECLARE_RATE_INFO(11, INV, 9, 12),   /* 11mbps */
 100         IWL_DECLARE_RATE_INFO(6, 0, 5, 11),      /*  6mbps ; MCS 0 */
 101         IWL_DECLARE_RATE_INFO(9, INV, 6, 11),    /*  9mbps */
 102         IWL_DECLARE_RATE_INFO(12, 1, 11, 18),    /* 12mbps ; MCS 1 */
 103         IWL_DECLARE_RATE_INFO(18, 2, 12, 24),    /* 18mbps ; MCS 2 */
 104         IWL_DECLARE_RATE_INFO(24, 3, 18, 36),    /* 24mbps ; MCS 3 */
 105         IWL_DECLARE_RATE_INFO(36, 4, 24, 48),    /* 36mbps ; MCS 4 */
 106         IWL_DECLARE_RATE_INFO(48, 5, 36, 54),    /* 48mbps ; MCS 5 */
 107         IWL_DECLARE_RATE_INFO(54, 6, 48, INV),   /* 54mbps ; MCS 6 */
 108         IWL_DECLARE_MCS_RATE(7),                 /* MCS 7 */
 109         IWL_DECLARE_MCS_RATE(8),                 /* MCS 8 */
 110         IWL_DECLARE_MCS_RATE(9),                 /* MCS 9 */
 111 };
 112
 113 enum rs_action {
 114         RS_ACTION_STAY = 0,
 115         RS_ACTION_DOWNSCALE = -1,
 116         RS_ACTION_UPSCALE = 1,
 117 };
 118
 119 enum rs_column_mode {
 120         RS_INVALID = 0,
 121         RS_LEGACY,
 122         RS_SISO,
 123         RS_MIMO2,
 124 };
 125
 126 #define MAX_NEXT_COLUMNS 7
 127 #define MAX_COLUMN_CHECKS 3
 128
 129 struct rs_tx_column;
 130
 131 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm,
 132                                      struct ieee80211_sta *sta,
 133                                      struct rs_rate *rate,
 134                                      const struct rs_tx_column *next_col);
 135
 136 struct rs_tx_column {
 137         enum rs_column_mode mode;
 138         u8 ant;
 139         bool sgi;
 140         enum rs_column next_columns[MAX_NEXT_COLUMNS];
 141         allow_column_func_t checks[MAX_COLUMN_CHECKS];
 142 };
 143
 144 static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 145                          struct rs_rate *rate,
 146                          const struct rs_tx_column *next_col)
 147 {
 148         return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant);
 149 }
 150
 151 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 152                           struct rs_rate *rate,
 153                           const struct rs_tx_column *next_col)
 154 {
 155         if (!sta->ht_cap.ht_supported)
 156                 return false;
 157
 158         if (sta->smps_mode == IEEE80211_SMPS_STATIC)
 159                 return false;
 160
 161         if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2)
 162                 return false;
 163
 164         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
 165                 return false;
 166
 167         if (mvm->nvm_data->sku_cap_mimo_disabled)
 168                 return false;
 169
 170         return true;
 171 }
 172
 173 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 174                           struct rs_rate *rate,
 175                           const struct rs_tx_column *next_col)
 176 {
 177         if (!sta->ht_cap.ht_supported)
 178                 return false;
 179
 180         return true;
 181 }
 182
 183 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 184                          struct rs_rate *rate,
 185                          const struct rs_tx_column *next_col)
 186 {
 187         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
 188         struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
 189
 190         if (is_ht20(rate) && (ht_cap->cap &
 191                              IEEE80211_HT_CAP_SGI_20))
 192                 return true;
 193         if (is_ht40(rate) && (ht_cap->cap &
 194                              IEEE80211_HT_CAP_SGI_40))
 195                 return true;
 196         if (is_ht80(rate) && (vht_cap->cap &
 197                              IEEE80211_VHT_CAP_SHORT_GI_80))
 198                 return true;
 199         if (is_ht160(rate) && (vht_cap->cap &
 200                              IEEE80211_VHT_CAP_SHORT_GI_160))
 201                 return true;
 202
 203         return false;
 204 }
 205
 206 static const struct rs_tx_column rs_tx_columns[] = {
 207         [RS_COLUMN_LEGACY_ANT_A] = {
 208                 .mode = RS_LEGACY,
 209                 .ant = ANT_A,
 210                 .next_columns = {
 211                         RS_COLUMN_LEGACY_ANT_B,
 212                         RS_COLUMN_SISO_ANT_A,
 213                         RS_COLUMN_MIMO2,
 214                         RS_COLUMN_INVALID,
 215                         RS_COLUMN_INVALID,
 216                         RS_COLUMN_INVALID,
 217                         RS_COLUMN_INVALID,
 218                 },
 219                 .checks = {
 220                         rs_ant_allow,
 221                 },
 222         },
 223         [RS_COLUMN_LEGACY_ANT_B] = {
 224                 .mode = RS_LEGACY,
 225                 .ant = ANT_B,
 226                 .next_columns = {
 227                         RS_COLUMN_LEGACY_ANT_A,
 228                         RS_COLUMN_SISO_ANT_B,
 229                         RS_COLUMN_MIMO2,
 230                         RS_COLUMN_INVALID,
 231                         RS_COLUMN_INVALID,
 232                         RS_COLUMN_INVALID,
 233                         RS_COLUMN_INVALID,
 234                 },
 235                 .checks = {
 236                         rs_ant_allow,
 237                 },
 238         },
 239         [RS_COLUMN_SISO_ANT_A] = {
 240                 .mode = RS_SISO,
 241                 .ant = ANT_A,
 242                 .next_columns = {
 243                         RS_COLUMN_SISO_ANT_B,
 244                         RS_COLUMN_MIMO2,
 245                         RS_COLUMN_SISO_ANT_A_SGI,
 246                         RS_COLUMN_LEGACY_ANT_A,
 247                         RS_COLUMN_LEGACY_ANT_B,
 248                         RS_COLUMN_INVALID,
 249                         RS_COLUMN_INVALID,
 250                 },
 251                 .checks = {
 252                         rs_siso_allow,
 253                         rs_ant_allow,
 254                 },
 255         },
 256         [RS_COLUMN_SISO_ANT_B] = {
 257                 .mode = RS_SISO,
 258                 .ant = ANT_B,
 259                 .next_columns = {
 260                         RS_COLUMN_SISO_ANT_A,
 261                         RS_COLUMN_MIMO2,
 262                         RS_COLUMN_SISO_ANT_B_SGI,
 263                         RS_COLUMN_LEGACY_ANT_A,
 264                         RS_COLUMN_LEGACY_ANT_B,
 265                         RS_COLUMN_INVALID,
 266                         RS_COLUMN_INVALID,
 267                 },
 268                 .checks = {
 269                         rs_siso_allow,
 270                         rs_ant_allow,
 271                 },
 272         },
 273         [RS_COLUMN_SISO_ANT_A_SGI] = {
 274                 .mode = RS_SISO,
 275                 .ant = ANT_A,
 276                 .sgi = true,
 277                 .next_columns = {
 278                         RS_COLUMN_SISO_ANT_B_SGI,
 279                         RS_COLUMN_MIMO2_SGI,
 280                         RS_COLUMN_SISO_ANT_A,
 281                         RS_COLUMN_LEGACY_ANT_A,
 282                         RS_COLUMN_LEGACY_ANT_B,
 283                         RS_COLUMN_INVALID,
 284                         RS_COLUMN_INVALID,
 285                 },
 286                 .checks = {
 287                         rs_siso_allow,
 288                         rs_ant_allow,
 289                         rs_sgi_allow,
 290                 },
 291         },
 292         [RS_COLUMN_SISO_ANT_B_SGI] = {
 293                 .mode = RS_SISO,
 294                 .ant = ANT_B,
 295                 .sgi = true,
 296                 .next_columns = {
 297                         RS_COLUMN_SISO_ANT_A_SGI,
 298                         RS_COLUMN_MIMO2_SGI,
 299                         RS_COLUMN_SISO_ANT_B,
 300                         RS_COLUMN_LEGACY_ANT_A,
 301                         RS_COLUMN_LEGACY_ANT_B,
 302                         RS_COLUMN_INVALID,
 303                         RS_COLUMN_INVALID,
 304                 },
 305                 .checks = {
 306                         rs_siso_allow,
 307                         rs_ant_allow,
 308                         rs_sgi_allow,
 309                 },
 310         },
 311         [RS_COLUMN_MIMO2] = {
 312                 .mode = RS_MIMO2,
 313                 .ant = ANT_AB,
 314                 .next_columns = {
 315                         RS_COLUMN_SISO_ANT_A,
 316                         RS_COLUMN_MIMO2_SGI,
 317                         RS_COLUMN_LEGACY_ANT_A,
 318                         RS_COLUMN_LEGACY_ANT_B,
 319                         RS_COLUMN_INVALID,
 320                         RS_COLUMN_INVALID,
 321                         RS_COLUMN_INVALID,
 322                 },
 323                 .checks = {
 324                         rs_mimo_allow,
 325                 },
 326         },
 327         [RS_COLUMN_MIMO2_SGI] = {
 328                 .mode = RS_MIMO2,
 329                 .ant = ANT_AB,
 330                 .sgi = true,
 331                 .next_columns = {
 332                         RS_COLUMN_SISO_ANT_A_SGI,
 333                         RS_COLUMN_MIMO2,
 334                         RS_COLUMN_LEGACY_ANT_A,
 335                         RS_COLUMN_LEGACY_ANT_B,
 336                         RS_COLUMN_INVALID,
 337                         RS_COLUMN_INVALID,
 338                         RS_COLUMN_INVALID,
 339                 },
 340                 .checks = {
 341                         rs_mimo_allow,
 342                         rs_sgi_allow,
 343                 },
 344         },
 345 };
 346
 347 static inline u8 rs_extract_rate(u32 rate_n_flags)
 348 {
 349         /* also works for HT because bits 7:6 are zero there */
 350         return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
 351 }
 352
 353 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
 354 {
 355         int idx = 0;
 356
 357         if (rate_n_flags & RATE_MCS_HT_MSK) {
 358                 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
 359                 idx += IWL_RATE_MCS_0_INDEX;
 360
 361                 /* skip 9M not supported in HT*/
 362                 if (idx >= IWL_RATE_9M_INDEX)
 363                         idx += 1;
 364                 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
 365                         return idx;
 366         } else if (rate_n_flags & RATE_MCS_VHT_MSK ||
 367                    rate_n_flags & RATE_MCS_HE_MSK) {
 368                 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
 369                 idx += IWL_RATE_MCS_0_INDEX;
 370
 371                 /* skip 9M not supported in VHT*/
 372                 if (idx >= IWL_RATE_9M_INDEX)
 373                         idx++;
 374                 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
 375                         return idx;
 376                 if ((rate_n_flags & RATE_MCS_HE_MSK) &&
 377                     (idx <= IWL_LAST_HE_RATE))
 378                         return idx;
 379         } else {
 380                 /* legacy rate format, search for match in table */
 381
 382                 u8 legacy_rate = rs_extract_rate(rate_n_flags);
 383                 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
 384                         if (iwl_rates[idx].plcp == legacy_rate)
 385                                 return idx;
 386         }
 387
 388         return IWL_RATE_INVALID;
 389 }
 390
 391 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
 392                                   struct ieee80211_sta *sta,
 393                                   struct iwl_lq_sta *lq_sta,
 394                                   int tid, bool ndp);
 395 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
 396                            struct ieee80211_sta *sta,
 397                            struct iwl_lq_sta *lq_sta,
 398                            const struct rs_rate *initial_rate);
 399 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
 400
 401 /**
 402  * The following tables contain the expected throughput metrics for all rates
 403  *
 404  *      1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 405  *
 406  * where invalid entries are zeros.
 407  *
 408  * CCK rates are only valid in legacy table and will only be used in G
 409  * (2.4 GHz) band.
 410  */
 411
 412 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
 413         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
 414 };
 415
 416 /* Expected TpT tables. 4 indexes:
 417  * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
 418  */
 419 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
 420         {0, 0, 0, 0, 42, 0,  76, 102, 124, 159, 183, 193, 202, 216, 0},
 421         {0, 0, 0, 0, 46, 0,  82, 110, 132, 168, 192, 202, 210, 225, 0},
 422         {0, 0, 0, 0, 49, 0,  97, 145, 192, 285, 375, 420, 464, 551, 0},
 423         {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
 424 };
 425
 426 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
 427         {0, 0, 0, 0,  77, 0, 127, 160, 184, 220, 242, 250,  257,  269,  275},
 428         {0, 0, 0, 0,  83, 0, 135, 169, 193, 229, 250, 257,  264,  275,  280},
 429         {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828,  911, 1070, 1173},
 430         {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
 431 };
 432
 433 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
 434         {0, 0, 0, 0, 130, 0, 191, 223, 244,  273,  288,  294,  298,  305,  308},
 435         {0, 0, 0, 0, 138, 0, 200, 231, 251,  279,  293,  298,  302,  308,  312},
 436         {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
 437         {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
 438 };
 439
 440 static const u16 expected_tpt_siso_160MHz[4][IWL_RATE_COUNT] = {
 441         {0, 0, 0, 0, 191, 0, 244, 288,  298,  308,  313,  318,  323,  328,  330},
 442         {0, 0, 0, 0, 200, 0, 251, 293,  302,  312,  317,  322,  327,  332,  334},
 443         {0, 0, 0, 0, 439, 0, 875, 1307, 1736, 2584, 3419, 3831, 4240, 5049, 5581},
 444         {0, 0, 0, 0, 488, 0, 972, 1451, 1925, 2864, 3785, 4240, 4691, 5581, 6165},
 445 };
 446
 447 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
 448         {0, 0, 0, 0,  74, 0, 123, 155, 179, 213, 235, 243, 250,  261, 0},
 449         {0, 0, 0, 0,  81, 0, 131, 164, 187, 221, 242, 250, 256,  267, 0},
 450         {0, 0, 0, 0,  98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
 451         {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
 452 };
 453
 454 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
 455         {0, 0, 0, 0, 123, 0, 182, 214, 235,  264,  279,  285,  289,  296,  300},
 456         {0, 0, 0, 0, 131, 0, 191, 222, 242,  270,  284,  289,  293,  300,  303},
 457         {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
 458         {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
 459 };
 460
 461 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
 462         {0, 0, 0, 0, 182, 0, 240,  264,  278,  299,  308,  311,  313,  317,  319},
 463         {0, 0, 0, 0, 190, 0, 247,  269,  282,  302,  310,  313,  315,  319,  320},
 464         {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
 465         {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
 466 };
 467
 468 static const u16 expected_tpt_mimo2_160MHz[4][IWL_RATE_COUNT] = {
 469         {0, 0, 0, 0, 240, 0, 278,  308,  313,  319,  322,  324,  328,  330,   334},
 470         {0, 0, 0, 0, 247, 0, 282,  310,  315,  320,  323,  325,  329,  332,   338},
 471         {0, 0, 0, 0, 875, 0, 1735, 2582, 3414, 5043, 6619, 7389, 8147, 9629,  10592},
 472         {0, 0, 0, 0, 971, 0, 1925, 2861, 3779, 5574, 7304, 8147, 8976, 10592, 11640},
 473 };
 474
 475 /* mbps, mcs */
 476 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
 477         {  "1", "BPSK DSSS"},
 478         {  "2", "QPSK DSSS"},
 479         {"5.5", "BPSK CCK"},
 480         { "11", "QPSK CCK"},
 481         {  "6", "BPSK 1/2"},
 482         {  "9", "BPSK 1/2"},
 483         { "12", "QPSK 1/2"},
 484         { "18", "QPSK 3/4"},
 485         { "24", "16QAM 1/2"},
 486         { "36", "16QAM 3/4"},
 487         { "48", "64QAM 2/3"},
 488         { "54", "64QAM 3/4"},
 489         { "60", "64QAM 5/6"},
 490 };
 491
 492 #define MCS_INDEX_PER_STREAM    (8)
 493
 494 static const char *rs_pretty_ant(u8 ant)
 495 {
 496         static const char * const ant_name[] = {
 497                 [ANT_NONE] = "None",
 498                 [ANT_A]    = "A",
 499                 [ANT_B]    = "B",
 500                 [ANT_AB]   = "AB",
 501                 [ANT_C]    = "C",
 502                 [ANT_AC]   = "AC",
 503                 [ANT_BC]   = "BC",
 504                 [ANT_ABC]  = "ABC",
 505         };
 506
 507         if (ant > ANT_ABC)
 508                 return "UNKNOWN";
 509
 510         return ant_name[ant];
 511 }
 512
 513 static const char *rs_pretty_lq_type(enum iwl_table_type type)
 514 {
 515         static const char * const lq_types[] = {
 516                 [LQ_NONE] = "NONE",
 517                 [LQ_LEGACY_A] = "LEGACY_A",
 518                 [LQ_LEGACY_G] = "LEGACY_G",
 519                 [LQ_HT_SISO] = "HT SISO",
 520                 [LQ_HT_MIMO2] = "HT MIMO",
 521                 [LQ_VHT_SISO] = "VHT SISO",
 522                 [LQ_VHT_MIMO2] = "VHT MIMO",
 523                 [LQ_HE_SISO] = "HE SISO",
 524                 [LQ_HE_MIMO2] = "HE MIMO",
 525         };
 526
 527         if (type < LQ_NONE || type >= LQ_MAX)
 528                 return "UNKNOWN";
 529
 530         return lq_types[type];
 531 }
 532
 533 static char *rs_pretty_rate(const struct rs_rate *rate)
 534 {
 535         static char buf[40];
 536         static const char * const legacy_rates[] = {
 537                 [IWL_RATE_1M_INDEX] = "1M",
 538                 [IWL_RATE_2M_INDEX] = "2M",
 539                 [IWL_RATE_5M_INDEX] = "5.5M",
 540                 [IWL_RATE_11M_INDEX] = "11M",
 541                 [IWL_RATE_6M_INDEX] = "6M",
 542                 [IWL_RATE_9M_INDEX] = "9M",
 543                 [IWL_RATE_12M_INDEX] = "12M",
 544                 [IWL_RATE_18M_INDEX] = "18M",
 545                 [IWL_RATE_24M_INDEX] = "24M",
 546                 [IWL_RATE_36M_INDEX] = "36M",
 547                 [IWL_RATE_48M_INDEX] = "48M",
 548                 [IWL_RATE_54M_INDEX] = "54M",
 549         };
 550         static const char *const ht_vht_rates[] = {
 551                 [IWL_RATE_MCS_0_INDEX] = "MCS0",
 552                 [IWL_RATE_MCS_1_INDEX] = "MCS1",
 553                 [IWL_RATE_MCS_2_INDEX] = "MCS2",
 554                 [IWL_RATE_MCS_3_INDEX] = "MCS3",
 555                 [IWL_RATE_MCS_4_INDEX] = "MCS4",
 556                 [IWL_RATE_MCS_5_INDEX] = "MCS5",
 557                 [IWL_RATE_MCS_6_INDEX] = "MCS6",
 558                 [IWL_RATE_MCS_7_INDEX] = "MCS7",
 559                 [IWL_RATE_MCS_8_INDEX] = "MCS8",
 560                 [IWL_RATE_MCS_9_INDEX] = "MCS9",
 561         };
 562         const char *rate_str;
 563
 564         if (is_type_legacy(rate->type) && (rate->index <= IWL_RATE_54M_INDEX))
 565                 rate_str = legacy_rates[rate->index];
 566         else if ((is_type_ht(rate->type) || is_type_vht(rate->type)) &&
 567                  (rate->index >= IWL_RATE_MCS_0_INDEX) &&
 568                  (rate->index <= IWL_RATE_MCS_9_INDEX))
 569                 rate_str = ht_vht_rates[rate->index];
 570         else
 571                 rate_str = "BAD_RATE";
 572
 573         sprintf(buf, "(%s|%s|%s)", rs_pretty_lq_type(rate->type),
 574                 rs_pretty_ant(rate->ant), rate_str);
 575         return buf;
 576 }
 577
 578 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
 579                                 const char *prefix)
 580 {
 581         IWL_DEBUG_RATE(mvm,
 582                        "%s: %s BW: %d SGI: %d LDPC: %d STBC: %d\n",
 583                        prefix, rs_pretty_rate(rate), rate->bw,
 584                        rate->sgi, rate->ldpc, rate->stbc);
 585 }
 586
 587 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
 588 {
 589         window->data = 0;
 590         window->success_counter = 0;
 591         window->success_ratio = IWL_INVALID_VALUE;
 592         window->counter = 0;
 593         window->average_tpt = IWL_INVALID_VALUE;
 594 }
 595
 596 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
 597                                             struct iwl_scale_tbl_info *tbl)
 598 {
 599         int i;
 600
 601         IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
 602         for (i = 0; i < IWL_RATE_COUNT; i++)
 603                 rs_rate_scale_clear_window(&tbl->win[i]);
 604
 605         for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
 606                 rs_rate_scale_clear_window(&tbl->tpc_win[i]);
 607 }
 608
 609 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 610 {
 611         return (ant_type & valid_antenna) == ant_type;
 612 }
 613
 614 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
 615                                      struct iwl_lq_sta *lq_data, u8 tid,
 616                                      struct ieee80211_sta *sta)
 617 {
 618         int ret = -EAGAIN;
 619
 620         IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
 621                      sta->addr, tid);
 622
 623         /* start BA session until the peer sends del BA */
 624         ret = ieee80211_start_tx_ba_session(sta, tid, 0);
 625         if (ret == -EAGAIN) {
 626                 /*
 627                  * driver and mac80211 is out of sync
 628                  * this might be cause by reloading firmware
 629                  * stop the tx ba session here
 630                  */
 631                 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
 632                         tid);
 633                 ieee80211_stop_tx_ba_session(sta, tid);
 634         }
 635         return ret;
 636 }
 637
 638 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
 639                               u8 tid, struct iwl_lq_sta *lq_sta,
 640                               struct ieee80211_sta *sta)
 641 {
 642         struct iwl_mvm_tid_data *tid_data;
 643
 644         /*
 645          * In AP mode, tid can be equal to IWL_MAX_TID_COUNT
 646          * when the frame is not QoS
 647          */
 648         if (WARN_ON_ONCE(tid > IWL_MAX_TID_COUNT)) {
 649                 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
 650                         tid, IWL_MAX_TID_COUNT);
 651                 return;
 652         } else if (tid == IWL_MAX_TID_COUNT) {
 653                 return;
 654         }
 655
 656         tid_data = &mvmsta->tid_data[tid];
 657         if (mvmsta->sta_state >= IEEE80211_STA_AUTHORIZED &&
 658             tid_data->state == IWL_AGG_OFF &&
 659             (lq_sta->tx_agg_tid_en & BIT(tid)) &&
 660             tid_data->tx_count_last >= IWL_MVM_RS_AGG_START_THRESHOLD) {
 661                 IWL_DEBUG_RATE(mvm, "try to aggregate tid %d\n", tid);
 662                 if (rs_tl_turn_on_agg_for_tid(mvm, lq_sta, tid, sta) == 0)
 663                         tid_data->state = IWL_AGG_QUEUED;
 664         }
 665 }
 666
 667 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
 668 {
 669         return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 670                !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 671                !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
 672 }
 673
 674 /*
 675  * Static function to get the expected throughput from an iwl_scale_tbl_info
 676  * that wraps a NULL pointer check
 677  */
 678 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
 679 {
 680         if (tbl->expected_tpt)
 681                 return tbl->expected_tpt[rs_index];
 682         return 0;
 683 }
 684
 685 /**
 686  * rs_collect_tx_data - Update the success/failure sliding window
 687  *
 688  * We keep a sliding window of the last 62 packets transmitted
 689  * at this rate.  window->data contains the bitmask of successful
 690  * packets.
 691  */
 692 static int _rs_collect_tx_data(struct iwl_mvm *mvm,
 693                                struct iwl_scale_tbl_info *tbl,
 694                                int scale_index, int attempts, int successes,
 695                                struct iwl_rate_scale_data *window)
 696 {
 697         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
 698         s32 fail_count, tpt;
 699
 700         /* Get expected throughput */
 701         tpt = get_expected_tpt(tbl, scale_index);
 702
 703         /*
 704          * Keep track of only the latest 62 tx frame attempts in this rate's
 705          * history window; anything older isn't really relevant any more.
 706          * If we have filled up the sliding window, drop the oldest attempt;
 707          * if the oldest attempt (highest bit in bitmap) shows "success",
 708          * subtract "1" from the success counter (this is the main reason
 709          * we keep these bitmaps!).
 710          */
 711         while (attempts > 0) {
 712                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
 713                         /* remove earliest */
 714                         window->counter = IWL_RATE_MAX_WINDOW - 1;
 715
 716                         if (window->data & mask) {
 717                                 window->data &= ~mask;
 718                                 window->success_counter--;
 719                         }
 720                 }
 721
 722                 /* Increment frames-attempted counter */
 723                 window->counter++;
 724
 725                 /* Shift bitmap by one frame to throw away oldest history */
 726                 window->data <<= 1;
 727
 728                 /* Mark the most recent #successes attempts as successful */
 729                 if (successes > 0) {
 730                         window->success_counter++;
 731                         window->data |= 0x1;
 732                         successes--;
 733                 }
 734
 735                 attempts--;
 736         }
 737
 738         /* Calculate current success ratio, avoid divide-by-0! */
 739         if (window->counter > 0)
 740                 window->success_ratio = 128 * (100 * window->success_counter)
 741                                         / window->counter;
 742         else
 743                 window->success_ratio = IWL_INVALID_VALUE;
 744
 745         fail_count = window->counter - window->success_counter;
 746
 747         /* Calculate average throughput, if we have enough history. */
 748         if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) ||
 749             (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH))
 750                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 751         else
 752                 window->average_tpt = IWL_INVALID_VALUE;
 753
 754         return 0;
 755 }
 756
 757 static int rs_collect_tpc_data(struct iwl_mvm *mvm,
 758                                struct iwl_lq_sta *lq_sta,
 759                                struct iwl_scale_tbl_info *tbl,
 760                                int scale_index, int attempts, int successes,
 761                                u8 reduced_txp)
 762 {
 763         struct iwl_rate_scale_data *window = NULL;
 764
 765         if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
 766                 return -EINVAL;
 767
 768         window = &tbl->tpc_win[reduced_txp];
 769         return  _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
 770                                     window);
 771 }
 772
 773 static void rs_update_tid_tpt_stats(struct iwl_mvm *mvm,
 774                                     struct iwl_mvm_sta *mvmsta,
 775                                     u8 tid, int successes)
 776 {
 777         struct iwl_mvm_tid_data *tid_data;
 778
 779         if (tid >= IWL_MAX_TID_COUNT)
 780                 return;
 781
 782         tid_data = &mvmsta->tid_data[tid];
 783
 784         /*
 785          * Measure if there're enough successful transmits per second.
 786          * These statistics are used only to decide if we can start a
 787          * BA session, so it should be updated only when A-MPDU is
 788          * off.
 789          */
 790         if (tid_data->state != IWL_AGG_OFF)
 791                 return;
 792
 793         if (time_is_before_jiffies(tid_data->tpt_meas_start + HZ) ||
 794             (tid_data->tx_count >= IWL_MVM_RS_AGG_START_THRESHOLD)) {
 795                 tid_data->tx_count_last = tid_data->tx_count;
 796                 tid_data->tx_count = 0;
 797                 tid_data->tpt_meas_start = jiffies;
 798         } else {
 799                 tid_data->tx_count += successes;
 800         }
 801 }
 802
 803 static int rs_collect_tlc_data(struct iwl_mvm *mvm,
 804                                struct iwl_mvm_sta *mvmsta, u8 tid,
 805                                struct iwl_scale_tbl_info *tbl,
 806                                int scale_index, int attempts, int successes)
 807 {
 808         struct iwl_rate_scale_data *window = NULL;
 809
 810         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 811                 return -EINVAL;
 812
 813         if (tbl->column != RS_COLUMN_INVALID) {
 814                 struct lq_sta_pers *pers = &mvmsta->lq_sta.rs_drv.pers;
 815
 816                 pers->tx_stats[tbl->column][scale_index].total += attempts;
 817                 pers->tx_stats[tbl->column][scale_index].success += successes;
 818         }
 819
 820         rs_update_tid_tpt_stats(mvm, mvmsta, tid, successes);
 821
 822         /* Select window for current tx bit rate */
 823         window = &(tbl->win[scale_index]);
 824         return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
 825                                    window);
 826 }
 827
 828 /* Convert rs_rate object into ucode rate bitmask */
 829 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
 830                                   struct rs_rate *rate)
 831 {
 832         u32 ucode_rate = 0;
 833         int index = rate->index;
 834
 835         ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
 836                          RATE_MCS_ANT_ABC_MSK);
 837
 838         if (is_legacy(rate)) {
 839                 ucode_rate |= iwl_rates[index].plcp;
 840                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 841                         ucode_rate |= RATE_MCS_CCK_MSK;
 842                 return ucode_rate;
 843         }
 844
 845         if (is_ht(rate)) {
 846                 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
 847                         IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
 848                         index = IWL_LAST_HT_RATE;
 849                 }
 850                 ucode_rate |= RATE_MCS_HT_MSK;
 851
 852                 if (is_ht_siso(rate))
 853                         ucode_rate |= iwl_rates[index].plcp_ht_siso;
 854                 else if (is_ht_mimo2(rate))
 855                         ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
 856                 else
 857                         WARN_ON_ONCE(1);
 858         } else if (is_vht(rate)) {
 859                 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
 860                         IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
 861                         index = IWL_LAST_VHT_RATE;
 862                 }
 863                 ucode_rate |= RATE_MCS_VHT_MSK;
 864                 if (is_vht_siso(rate))
 865                         ucode_rate |= iwl_rates[index].plcp_vht_siso;
 866                 else if (is_vht_mimo2(rate))
 867                         ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
 868                 else
 869                         WARN_ON_ONCE(1);
 870
 871         } else {
 872                 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
 873         }
 874
 875         if (is_siso(rate) && rate->stbc) {
 876                 /* To enable STBC we need to set both a flag and ANT_AB */
 877                 ucode_rate |= RATE_MCS_ANT_AB_MSK;
 878                 ucode_rate |= RATE_MCS_STBC_MSK;
 879         }
 880
 881         ucode_rate |= rate->bw;
 882         if (rate->sgi)
 883                 ucode_rate |= RATE_MCS_SGI_MSK;
 884         if (rate->ldpc)
 885                 ucode_rate |= RATE_MCS_LDPC_MSK;
 886
 887         return ucode_rate;
 888 }
 889
 890 /* Convert a ucode rate into an rs_rate object */
 891 static int rs_rate_from_ucode_rate(const u32 ucode_rate,
 892                                    enum nl80211_band band,
 893                                    struct rs_rate *rate)
 894 {
 895         u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
 896         u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
 897         u8 nss;
 898
 899         memset(rate, 0, sizeof(*rate));
 900         rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
 901
 902         if (rate->index == IWL_RATE_INVALID)
 903                 return -EINVAL;
 904
 905         rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
 906
 907         /* Legacy */
 908         if (!(ucode_rate & RATE_MCS_HT_MSK) &&
 909             !(ucode_rate & RATE_MCS_VHT_MSK) &&
 910             !(ucode_rate & RATE_MCS_HE_MSK)) {
 911                 if (num_of_ant == 1) {
 912                         if (band == NL80211_BAND_5GHZ)
 913                                 rate->type = LQ_LEGACY_A;
 914                         else
 915                                 rate->type = LQ_LEGACY_G;
 916                 }
 917
 918                 return 0;
 919         }
 920
 921         /* HT, VHT or HE */
 922         if (ucode_rate & RATE_MCS_SGI_MSK)
 923                 rate->sgi = true;
 924         if (ucode_rate & RATE_MCS_LDPC_MSK)
 925                 rate->ldpc = true;
 926         if (ucode_rate & RATE_MCS_STBC_MSK)
 927                 rate->stbc = true;
 928         if (ucode_rate & RATE_MCS_BF_MSK)
 929                 rate->bfer = true;
 930
 931         rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
 932
 933         if (ucode_rate & RATE_MCS_HT_MSK) {
 934                 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
 935                        RATE_HT_MCS_NSS_POS) + 1;
 936
 937                 if (nss == 1) {
 938                         rate->type = LQ_HT_SISO;
 939                         WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
 940                                   "stbc %d bfer %d",
 941                                   rate->stbc, rate->bfer);
 942                 } else if (nss == 2) {
 943                         rate->type = LQ_HT_MIMO2;
 944                         WARN_ON_ONCE(num_of_ant != 2);
 945                 } else {
 946                         WARN_ON_ONCE(1);
 947                 }
 948         } else if (ucode_rate & RATE_MCS_VHT_MSK) {
 949                 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
 950                        RATE_VHT_MCS_NSS_POS) + 1;
 951
 952                 if (nss == 1) {
 953                         rate->type = LQ_VHT_SISO;
 954                         WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
 955                                   "stbc %d bfer %d",
 956                                   rate->stbc, rate->bfer);
 957                 } else if (nss == 2) {
 958                         rate->type = LQ_VHT_MIMO2;
 959                         WARN_ON_ONCE(num_of_ant != 2);
 960                 } else {
 961                         WARN_ON_ONCE(1);
 962                 }
 963         } else if (ucode_rate & RATE_MCS_HE_MSK) {
 964                 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
 965                       RATE_VHT_MCS_NSS_POS) + 1;
 966
 967                 if (nss == 1) {
 968                         rate->type = LQ_HE_SISO;
 969                         WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
 970                                   "stbc %d bfer %d", rate->stbc, rate->bfer);
 971                 } else if (nss == 2) {
 972                         rate->type = LQ_HE_MIMO2;
 973                         WARN_ON_ONCE(num_of_ant != 2);
 974                 } else {
 975                         WARN_ON_ONCE(1);
 976                 }
 977         }
 978
 979         WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
 980                      !is_he(rate) && !is_vht(rate));
 981
 982         return 0;
 983 }
 984
 985 /* switch to another antenna/antennas and return 1 */
 986 /* if no other valid antenna found, return 0 */
 987 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
 988 {
 989         u8 new_ant_type;
 990
 991         if (!rate->ant || WARN_ON_ONCE(rate->ant & ANT_C))
 992                 return 0;
 993
 994         if (!rs_is_valid_ant(valid_ant, rate->ant))
 995                 return 0;
 996
 997         new_ant_type = ant_toggle_lookup[rate->ant];
 998
 999         while ((new_ant_type != rate->ant) &&
1000                !rs_is_valid_ant(valid_ant, new_ant_type))
1001                 new_ant_type = ant_toggle_lookup[new_ant_type];
1002
1003         if (new_ant_type == rate->ant)
1004                 return 0;
1005
1006         rate->ant = new_ant_type;
1007
1008         return 1;
1009 }
1010
1011 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
1012                                   struct rs_rate *rate)
1013 {
1014         if (is_legacy(rate))
1015                 return lq_sta->active_legacy_rate;
1016         else if (is_siso(rate))
1017                 return lq_sta->active_siso_rate;
1018         else if (is_mimo2(rate))
1019                 return lq_sta->active_mimo2_rate;
1020
1021         WARN_ON_ONCE(1);
1022         return 0;
1023 }
1024
1025 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
1026                                 int rate_type)
1027 {
1028         u8 high = IWL_RATE_INVALID;
1029         u8 low = IWL_RATE_INVALID;
1030
1031         /* 802.11A or ht walks to the next literal adjacent rate in
1032          * the rate table */
1033         if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
1034                 int i;
1035                 u32 mask;
1036
1037                 /* Find the previous rate that is in the rate mask */
1038                 i = index - 1;
1039                 if (i >= 0)
1040                         mask = BIT(i);
1041                 for (; i >= 0; i--, mask >>= 1) {
1042                         if (rate_mask & mask) {
1043                                 low = i;
1044                                 break;
1045                         }
1046                 }
1047
1048                 /* Find the next rate that is in the rate mask */
1049                 i = index + 1;
1050                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
1051                         if (rate_mask & mask) {
1052                                 high = i;
1053                                 break;
1054                         }
1055                 }
1056
1057                 return (high << 8) | low;
1058         }
1059
1060         low = index;
1061         while (low != IWL_RATE_INVALID) {
1062                 low = iwl_rates[low].prev_rs;
1063                 if (low == IWL_RATE_INVALID)
1064                         break;
1065                 if (rate_mask & (1 << low))
1066                         break;
1067         }
1068
1069         high = index;
1070         while (high != IWL_RATE_INVALID) {
1071                 high = iwl_rates[high].next_rs;
1072                 if (high == IWL_RATE_INVALID)
1073                         break;
1074                 if (rate_mask & (1 << high))
1075                         break;
1076         }
1077
1078         return (high << 8) | low;
1079 }
1080
1081 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
1082                                      struct rs_rate *rate)
1083 {
1084         return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
1085 }
1086
1087 /* Get the next supported lower rate in the current column.
1088  * Return true if bottom rate in the current column was reached
1089  */
1090 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
1091                                         struct rs_rate *rate)
1092 {
1093         u8 low;
1094         u16 high_low;
1095         u16 rate_mask;
1096         struct iwl_mvm *mvm = lq_sta->pers.drv;
1097
1098         rate_mask = rs_get_supported_rates(lq_sta, rate);
1099         high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
1100                                         rate->type);
1101         low = high_low & 0xff;
1102
1103         /* Bottom rate of column reached */
1104         if (low == IWL_RATE_INVALID)
1105                 return true;
1106
1107         rate->index = low;
1108         return false;
1109 }
1110
1111 /* Get the next rate to use following a column downgrade */
1112 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
1113                                           struct rs_rate *rate)
1114 {
1115         struct iwl_mvm *mvm = lq_sta->pers.drv;
1116
1117         if (is_legacy(rate)) {
1118                 /* No column to downgrade from Legacy */
1119                 return;
1120         } else if (is_siso(rate)) {
1121                 /* Downgrade to Legacy if we were in SISO */
1122                 if (lq_sta->band == NL80211_BAND_5GHZ)
1123                         rate->type = LQ_LEGACY_A;
1124                 else
1125                         rate->type = LQ_LEGACY_G;
1126
1127                 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1128
1129                 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
1130                              rate->index > IWL_RATE_MCS_9_INDEX);
1131
1132                 rate->index = rs_ht_to_legacy[rate->index];
1133                 rate->ldpc = false;
1134         } else {
1135                 /* Downgrade to SISO with same MCS if in MIMO  */
1136                 rate->type = is_vht_mimo2(rate) ?
1137                         LQ_VHT_SISO : LQ_HT_SISO;
1138         }
1139
1140         if (num_of_ant(rate->ant) > 1)
1141                 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
1142
1143         /* Relevant in both switching to SISO or Legacy */
1144         rate->sgi = false;
1145
1146         if (!rs_rate_supported(lq_sta, rate))
1147                 rs_get_lower_rate_in_column(lq_sta, rate);
1148 }
1149
1150 /* Check if both rates share the same column */
1151 static inline bool rs_rate_column_match(struct rs_rate *a,
1152                                         struct rs_rate *b)
1153 {
1154         bool ant_match;
1155
1156         if (a->stbc || a->bfer)
1157                 ant_match = (b->ant == ANT_A || b->ant == ANT_B);
1158         else
1159                 ant_match = (a->ant == b->ant);
1160
1161         return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi)
1162                 && ant_match;
1163 }
1164
1165 static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate)
1166 {
1167         if (is_legacy(rate)) {
1168                 if (rate->ant == ANT_A)
1169                         return RS_COLUMN_LEGACY_ANT_A;
1170
1171                 if (rate->ant == ANT_B)
1172                         return RS_COLUMN_LEGACY_ANT_B;
1173
1174                 goto err;
1175         }
1176
1177         if (is_siso(rate)) {
1178                 if (rate->ant == ANT_A || rate->stbc || rate->bfer)
1179                         return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI :
1180                                 RS_COLUMN_SISO_ANT_A;
1181
1182                 if (rate->ant == ANT_B)
1183                         return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI :
1184                                 RS_COLUMN_SISO_ANT_B;
1185
1186                 goto err;
1187         }
1188
1189         if (is_mimo(rate))
1190                 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2;
1191
1192 err:
1193         return RS_COLUMN_INVALID;
1194 }
1195
1196 static u8 rs_get_tid(struct ieee80211_hdr *hdr)
1197 {
1198         u8 tid = IWL_MAX_TID_COUNT;
1199
1200         if (ieee80211_is_data_qos(hdr->frame_control)) {
1201                 u8 *qc = ieee80211_get_qos_ctl(hdr);
1202                 tid = qc[0] & 0xf;
1203         }
1204
1205         if (unlikely(tid > IWL_MAX_TID_COUNT))
1206                 tid = IWL_MAX_TID_COUNT;
1207
1208         return tid;
1209 }
1210
1211 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1212                           int tid, struct ieee80211_tx_info *info, bool ndp)
1213 {
1214         int legacy_success;
1215         int retries;
1216         int i;
1217         struct iwl_lq_cmd *table;
1218         u32 lq_hwrate;
1219         struct rs_rate lq_rate, tx_resp_rate;
1220         struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
1221         u32 tlc_info = (uintptr_t)info->status.status_driver_data[0];
1222         u8 reduced_txp = tlc_info & RS_DRV_DATA_TXP_MSK;
1223         u8 lq_color = RS_DRV_DATA_LQ_COLOR_GET(tlc_info);
1224         u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1];
1225         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1226         struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
1227
1228         /* Treat uninitialized rate scaling data same as non-existing. */
1229         if (!lq_sta) {
1230                 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
1231                 return;
1232         } else if (!lq_sta->pers.drv) {
1233                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
1234                 return;
1235         }
1236
1237         /* This packet was aggregated but doesn't carry status info */
1238         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
1239             !(info->flags & IEEE80211_TX_STAT_AMPDU))
1240                 return;
1241
1242         if (rs_rate_from_ucode_rate(tx_resp_hwrate, info->band,
1243                                     &tx_resp_rate)) {
1244                 WARN_ON_ONCE(1);
1245                 return;
1246         }
1247
1248 #ifdef CONFIG_MAC80211_DEBUGFS
1249         /* Disable last tx check if we are debugging with fixed rate but
1250          * update tx stats */
1251         if (lq_sta->pers.dbg_fixed_rate) {
1252                 int index = tx_resp_rate.index;
1253                 enum rs_column column;
1254                 int attempts, success;
1255
1256                 column = rs_get_column_from_rate(&tx_resp_rate);
1257                 if (WARN_ONCE(column == RS_COLUMN_INVALID,
1258                               "Can't map rate 0x%x to column",
1259                               tx_resp_hwrate))
1260                         return;
1261
1262                 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1263                         attempts = info->status.ampdu_len;
1264                         success = info->status.ampdu_ack_len;
1265                 } else {
1266                         attempts = info->status.rates[0].count;
1267                         success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1268                 }
1269
1270                 lq_sta->pers.tx_stats[column][index].total += attempts;
1271                 lq_sta->pers.tx_stats[column][index].success += success;
1272
1273                 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n",
1274                                tx_resp_hwrate, success, attempts);
1275                 return;
1276         }
1277 #endif
1278
1279         if (time_after(jiffies,
1280                        (unsigned long)(lq_sta->last_tx +
1281                                        (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
1282                 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
1283                 iwl_mvm_rs_rate_init(mvm, sta, info->band, true);
1284                 return;
1285         }
1286         lq_sta->last_tx = jiffies;
1287
1288         /* Ignore this Tx frame response if its initial rate doesn't match
1289          * that of latest Link Quality command.  There may be stragglers
1290          * from a previous Link Quality command, but we're no longer interested
1291          * in those; they're either from the "active" mode while we're trying
1292          * to check "search" mode, or a prior "search" mode after we've moved
1293          * to a new "search" mode (which might become the new "active" mode).
1294          */
1295         table = &lq_sta->lq;
1296         lq_hwrate = le32_to_cpu(table->rs_table[0]);
1297         if (rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate)) {
1298                 WARN_ON_ONCE(1);
1299                 return;
1300         }
1301
1302         /* Here we actually compare this rate to the latest LQ command */
1303         if (lq_color != LQ_FLAG_COLOR_GET(table->flags)) {
1304                 IWL_DEBUG_RATE(mvm,
1305                                "tx resp color 0x%x does not match 0x%x\n",
1306                                lq_color, LQ_FLAG_COLOR_GET(table->flags));
1307
1308                 /*
1309                  * Since rates mis-match, the last LQ command may have failed.
1310                  * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1311                  * ... driver.
1312                  */
1313                 lq_sta->missed_rate_counter++;
1314                 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
1315                         lq_sta->missed_rate_counter = 0;
1316                         IWL_DEBUG_RATE(mvm,
1317                                        "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1318                                        lq_sta->rs_state);
1319                         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1320                 }
1321                 /* Regardless, ignore this status info for outdated rate */
1322                 return;
1323         } else
1324                 /* Rate did match, so reset the missed_rate_counter */
1325                 lq_sta->missed_rate_counter = 0;
1326
1327         if (!lq_sta->search_better_tbl) {
1328                 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1329                 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1330         } else {
1331                 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1332                 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1333         }
1334
1335         if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) {
1336                 IWL_DEBUG_RATE(mvm,
1337                                "Neither active nor search matches tx rate\n");
1338                 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1339                 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
1340                 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1341                 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
1342                 rs_dump_rate(mvm, &lq_rate, "ACTUAL");
1343
1344                 /*
1345                  * no matching table found, let's by-pass the data collection
1346                  * and continue to perform rate scale to find the rate table
1347                  */
1348                 rs_stay_in_table(lq_sta, true);
1349                 goto done;
1350         }
1351
1352         /*
1353          * Updating the frame history depends on whether packets were
1354          * aggregated.
1355          *
1356          * For aggregation, all packets were transmitted at the same rate, the
1357          * first index into rate scale table.
1358          */
1359         if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1360                 rs_collect_tpc_data(mvm, lq_sta, curr_tbl, tx_resp_rate.index,
1361                                     info->status.ampdu_len,
1362                                     info->status.ampdu_ack_len,
1363                                     reduced_txp);
1364
1365                 /* ampdu_ack_len = 0 marks no BA was received. For TLC, treat
1366                  * it as a single frame loss as we don't want the success ratio
1367                  * to dip too quickly because a BA wasn't received.
1368                  * For TPC, there's no need for this optimisation since we want
1369                  * to recover very quickly from a bad power reduction and,
1370                  * therefore we'd like the success ratio to get an immediate hit
1371                  * when failing to get a BA, so we'd switch back to a lower or
1372                  * zero power reduction. When FW transmits agg with a rate
1373                  * different from the initial rate, it will not use reduced txp
1374                  * and will send BA notification twice (one empty with reduced
1375                  * txp equal to the value from LQ and one with reduced txp 0).
1376                  * We need to update counters for each txp level accordingly.
1377                  */
1378                 if (info->status.ampdu_ack_len == 0)
1379                         info->status.ampdu_len = 1;
1380
1381                 rs_collect_tlc_data(mvm, mvmsta, tid, curr_tbl, tx_resp_rate.index,
1382                                     info->status.ampdu_len,
1383                                     info->status.ampdu_ack_len);
1384
1385                 /* Update success/fail counts if not searching for new mode */
1386                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1387                         lq_sta->total_success += info->status.ampdu_ack_len;
1388                         lq_sta->total_failed += (info->status.ampdu_len -
1389                                         info->status.ampdu_ack_len);
1390                 }
1391         } else {
1392                 /* For legacy, update frame history with for each Tx retry. */
1393                 retries = info->status.rates[0].count - 1;
1394                 /* HW doesn't send more than 15 retries */
1395                 retries = min(retries, 15);
1396
1397                 /* The last transmission may have been successful */
1398                 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1399                 /* Collect data for each rate used during failed TX attempts */
1400                 for (i = 0; i <= retries; ++i) {
1401                         lq_hwrate = le32_to_cpu(table->rs_table[i]);
1402                         if (rs_rate_from_ucode_rate(lq_hwrate, info->band,
1403                                                     &lq_rate)) {
1404                                 WARN_ON_ONCE(1);
1405                                 return;
1406                         }
1407
1408                         /*
1409                          * Only collect stats if retried rate is in the same RS
1410                          * table as active/search.
1411                          */
1412                         if (rs_rate_column_match(&lq_rate, &curr_tbl->rate))
1413                                 tmp_tbl = curr_tbl;
1414                         else if (rs_rate_column_match(&lq_rate,
1415                                                       &other_tbl->rate))
1416                                 tmp_tbl = other_tbl;
1417                         else
1418                                 continue;
1419
1420                         rs_collect_tpc_data(mvm, lq_sta, tmp_tbl,
1421                                             tx_resp_rate.index, 1,
1422                                             i < retries ? 0 : legacy_success,
1423                                             reduced_txp);
1424                         rs_collect_tlc_data(mvm, mvmsta, tid, tmp_tbl,
1425                                             tx_resp_rate.index, 1,
1426                                             i < retries ? 0 : legacy_success);
1427                 }
1428
1429                 /* Update success/fail counts if not searching for new mode */
1430                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1431                         lq_sta->total_success += legacy_success;
1432                         lq_sta->total_failed += retries + (1 - legacy_success);
1433                 }
1434         }
1435         /* The last TX rate is cached in lq_sta; it's set in if/else above */
1436         lq_sta->last_rate_n_flags = lq_hwrate;
1437         IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
1438 done:
1439         /* See if there's a better rate or modulation mode to try. */
1440         if (sta->supp_rates[info->band])
1441                 rs_rate_scale_perform(mvm, sta, lq_sta, tid, ndp);
1442 }
1443
1444 /*
1445  * mac80211 sends us Tx status
1446  */
1447 static void rs_drv_mac80211_tx_status(void *mvm_r,
1448                                       struct ieee80211_supported_band *sband,
1449                                       struct ieee80211_sta *sta, void *priv_sta,
1450                                       struct sk_buff *skb)
1451 {
1452         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1453         struct iwl_op_mode *op_mode = mvm_r;
1454         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1455         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1456
1457         if (!iwl_mvm_sta_from_mac80211(sta)->vif)
1458                 return;
1459
1460         if (!ieee80211_is_data(hdr->frame_control) ||
1461             info->flags & IEEE80211_TX_CTL_NO_ACK)
1462                 return;
1463
1464         iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info,
1465                              ieee80211_is_qos_nullfunc(hdr->frame_control));
1466 }
1467
1468 /*
1469  * Begin a period of staying with a selected modulation mode.
1470  * Set "stay_in_tbl" flag to prevent any mode switches.
1471  * Set frame tx success limits according to legacy vs. high-throughput,
1472  * and reset overall (spanning all rates) tx success history statistics.
1473  * These control how long we stay using same modulation mode before
1474  * searching for a new mode.
1475  */
1476 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1477                                  struct iwl_lq_sta *lq_sta)
1478 {
1479         IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1480         lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1481         if (is_legacy) {
1482                 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT;
1483                 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT;
1484                 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT;
1485         } else {
1486                 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT;
1487                 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT;
1488                 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT;
1489         }
1490         lq_sta->table_count = 0;
1491         lq_sta->total_failed = 0;
1492         lq_sta->total_success = 0;
1493         lq_sta->flush_timer = jiffies;
1494         lq_sta->visited_columns = 0;
1495 }
1496
1497 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask)
1498 {
1499         if (rate_mask)
1500                 return find_last_bit(&rate_mask, BITS_PER_LONG);
1501         return IWL_RATE_INVALID;
1502 }
1503
1504 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1505                                    const struct rs_tx_column *column)
1506 {
1507         switch (column->mode) {
1508         case RS_LEGACY:
1509                 return lq_sta->max_legacy_rate_idx;
1510         case RS_SISO:
1511                 return lq_sta->max_siso_rate_idx;
1512         case RS_MIMO2:
1513                 return lq_sta->max_mimo2_rate_idx;
1514         default:
1515                 WARN_ON_ONCE(1);
1516         }
1517
1518         return lq_sta->max_legacy_rate_idx;
1519 }
1520
1521 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1522                                             const struct rs_tx_column *column,
1523                                             u32 bw)
1524 {
1525         /* Used to choose among HT tables */
1526         const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1527
1528         if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1529                          column->mode != RS_SISO &&
1530                          column->mode != RS_MIMO2))
1531                 return expected_tpt_legacy;
1532
1533         /* Legacy rates have only one table */
1534         if (column->mode == RS_LEGACY)
1535                 return expected_tpt_legacy;
1536
1537         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1538         /* Choose among many HT tables depending on number of streams
1539          * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1540          * status */
1541         if (column->mode == RS_SISO) {
1542                 switch (bw) {
1543                 case RATE_MCS_CHAN_WIDTH_20:
1544                         ht_tbl_pointer = expected_tpt_siso_20MHz;
1545                         break;
1546                 case RATE_MCS_CHAN_WIDTH_40:
1547                         ht_tbl_pointer = expected_tpt_siso_40MHz;
1548                         break;
1549                 case RATE_MCS_CHAN_WIDTH_80:
1550                         ht_tbl_pointer = expected_tpt_siso_80MHz;
1551                         break;
1552                 case RATE_MCS_CHAN_WIDTH_160:
1553                         ht_tbl_pointer = expected_tpt_siso_160MHz;
1554                         break;
1555                 default:
1556                         WARN_ON_ONCE(1);
1557                 }
1558         } else if (column->mode == RS_MIMO2) {
1559                 switch (bw) {
1560                 case RATE_MCS_CHAN_WIDTH_20:
1561                         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1562                         break;
1563                 case RATE_MCS_CHAN_WIDTH_40:
1564                         ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1565                         break;
1566                 case RATE_MCS_CHAN_WIDTH_80:
1567                         ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1568                         break;
1569                 case RATE_MCS_CHAN_WIDTH_160:
1570                         ht_tbl_pointer = expected_tpt_mimo2_160MHz;
1571                         break;
1572                 default:
1573                         WARN_ON_ONCE(1);
1574                 }
1575         } else {
1576                 WARN_ON_ONCE(1);
1577         }
1578
1579         if (!column->sgi && !lq_sta->is_agg)            /* Normal */
1580                 return ht_tbl_pointer[0];
1581         else if (column->sgi && !lq_sta->is_agg)        /* SGI */
1582                 return ht_tbl_pointer[1];
1583         else if (!column->sgi && lq_sta->is_agg)        /* AGG */
1584                 return ht_tbl_pointer[2];
1585         else                                            /* AGG+SGI */
1586                 return ht_tbl_pointer[3];
1587 }
1588
1589 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1590                                       struct iwl_scale_tbl_info *tbl)
1591 {
1592         struct rs_rate *rate = &tbl->rate;
1593         const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1594
1595         tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1596 }
1597
1598 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1599                             struct iwl_lq_sta *lq_sta,
1600                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1601                             unsigned long rate_mask, s8 index)
1602 {
1603         struct iwl_scale_tbl_info *active_tbl =
1604             &(lq_sta->lq_info[lq_sta->active_tbl]);
1605         s32 success_ratio = active_tbl->win[index].success_ratio;
1606         u16 expected_current_tpt = active_tbl->expected_tpt[index];
1607         const u16 *tpt_tbl = tbl->expected_tpt;
1608         u16 high_low;
1609         u32 target_tpt;
1610         int rate_idx;
1611
1612         if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1613                 target_tpt = 100 * expected_current_tpt;
1614                 IWL_DEBUG_RATE(mvm,
1615                                "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1616                                success_ratio, target_tpt);
1617         } else {
1618                 target_tpt = lq_sta->last_tpt;
1619                 IWL_DEBUG_RATE(mvm,
1620                                "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n",
1621                                success_ratio, target_tpt);
1622         }
1623
1624         rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
1625
1626         while (rate_idx != IWL_RATE_INVALID) {
1627                 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1628                         break;
1629
1630                 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1631                                                 tbl->rate.type);
1632
1633                 rate_idx = (high_low >> 8) & 0xff;
1634         }
1635
1636         IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1637                        rate_idx, target_tpt,
1638                        rate_idx != IWL_RATE_INVALID ?
1639                        100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1640
1641         return rate_idx;
1642 }
1643
1644 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1645 {
1646         switch (sta->bandwidth) {
1647         case IEEE80211_STA_RX_BW_160:
1648                 return RATE_MCS_CHAN_WIDTH_160;
1649         case IEEE80211_STA_RX_BW_80:
1650                 return RATE_MCS_CHAN_WIDTH_80;
1651         case IEEE80211_STA_RX_BW_40:
1652                 return RATE_MCS_CHAN_WIDTH_40;
1653         case IEEE80211_STA_RX_BW_20:
1654         default:
1655                 return RATE_MCS_CHAN_WIDTH_20;
1656         }
1657 }
1658
1659 /*
1660  * Check whether we should continue using same modulation mode, or
1661  * begin search for a new mode, based on:
1662  * 1) # tx successes or failures while using this mode
1663  * 2) # times calling this function
1664  * 3) elapsed time in this mode (not used, for now)
1665  */
1666 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1667 {
1668         struct iwl_scale_tbl_info *tbl;
1669         int active_tbl;
1670         int flush_interval_passed = 0;
1671         struct iwl_mvm *mvm;
1672
1673         mvm = lq_sta->pers.drv;
1674         active_tbl = lq_sta->active_tbl;
1675
1676         tbl = &(lq_sta->lq_info[active_tbl]);
1677
1678         /* If we've been disallowing search, see if we should now allow it */
1679         if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1680                 /* Elapsed time using current modulation mode */
1681                 if (lq_sta->flush_timer)
1682                         flush_interval_passed =
1683                                 time_after(jiffies,
1684                                            (unsigned long)(lq_sta->flush_timer +
1685                                                            (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
1686
1687                 /*
1688                  * Check if we should allow search for new modulation mode.
1689                  * If many frames have failed or succeeded, or we've used
1690                  * this same modulation for a long time, allow search, and
1691                  * reset history stats that keep track of whether we should
1692                  * allow a new search.  Also (below) reset all bitmaps and
1693                  * stats in active history.
1694                  */
1695                 if (force_search ||
1696                     (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1697                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1698                     ((!lq_sta->search_better_tbl) &&
1699                      (lq_sta->flush_timer) && (flush_interval_passed))) {
1700                         IWL_DEBUG_RATE(mvm,
1701                                        "LQ: stay is expired %d %d %d\n",
1702                                      lq_sta->total_failed,
1703                                      lq_sta->total_success,
1704                                      flush_interval_passed);
1705
1706                         /* Allow search for new mode */
1707                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1708                         IWL_DEBUG_RATE(mvm,
1709                                        "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1710                         lq_sta->total_failed = 0;
1711                         lq_sta->total_success = 0;
1712                         lq_sta->flush_timer = 0;
1713                         /* mark the current column as visited */
1714                         lq_sta->visited_columns = BIT(tbl->column);
1715                 /*
1716                  * Else if we've used this modulation mode enough repetitions
1717                  * (regardless of elapsed time or success/failure), reset
1718                  * history bitmaps and rate-specific stats for all rates in
1719                  * active table.
1720                  */
1721                 } else {
1722                         lq_sta->table_count++;
1723                         if (lq_sta->table_count >=
1724                             lq_sta->table_count_limit) {
1725                                 lq_sta->table_count = 0;
1726
1727                                 IWL_DEBUG_RATE(mvm,
1728                                                "LQ: stay in table clear win\n");
1729                                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1730                         }
1731                 }
1732
1733                 /* If transitioning to allow "search", reset all history
1734                  * bitmaps and stats in active table (this will become the new
1735                  * "search" table). */
1736                 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1737                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
1738                 }
1739         }
1740 }
1741
1742 static void rs_set_amsdu_len(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1743                              struct iwl_scale_tbl_info *tbl,
1744                              enum rs_action scale_action)
1745 {
1746         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1747
1748         /*
1749          * In case TLC offload is not active amsdu_enabled is either 0xFFFF
1750          * or 0, since there is no per-TID alg.
1751          */
1752         if ((!is_vht(&tbl->rate) && !is_ht(&tbl->rate)) ||
1753             tbl->rate.index < IWL_RATE_MCS_5_INDEX ||
1754             scale_action == RS_ACTION_DOWNSCALE)
1755                 mvmsta->amsdu_enabled = 0;
1756         else
1757                 mvmsta->amsdu_enabled = 0xFFFF;
1758
1759         mvmsta->max_amsdu_len = sta->max_amsdu_len;
1760 }
1761
1762 /*
1763  * setup rate table in uCode
1764  */
1765 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1766                                struct ieee80211_sta *sta,
1767                                struct iwl_lq_sta *lq_sta,
1768                                struct iwl_scale_tbl_info *tbl)
1769 {
1770         rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
1771         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1772 }
1773
1774 static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm,
1775                               struct ieee80211_sta *sta,
1776                               struct iwl_lq_sta *lq_sta,
1777                               struct iwl_scale_tbl_info *tbl,
1778                               enum rs_action scale_action)
1779 {
1780         if (sta->bandwidth != IEEE80211_STA_RX_BW_80)
1781                 return false;
1782
1783         if (!is_vht_siso(&tbl->rate))
1784                 return false;
1785
1786         if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) &&
1787             (tbl->rate.index == IWL_RATE_MCS_0_INDEX) &&
1788             (scale_action == RS_ACTION_DOWNSCALE)) {
1789                 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20;
1790                 tbl->rate.index = IWL_RATE_MCS_4_INDEX;
1791                 IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n");
1792                 goto tweaked;
1793         }
1794
1795         /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is
1796          * sustainable, i.e. we're past the test window. We can't go back
1797          * if MCS5 is just tested as this will happen always after switching
1798          * to 20Mhz MCS4 because the rate stats are cleared.
1799          */
1800         if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) &&
1801             (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) &&
1802              (scale_action == RS_ACTION_STAY)) ||
1803              ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) &&
1804               (scale_action == RS_ACTION_UPSCALE)))) {
1805                 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80;
1806                 tbl->rate.index = IWL_RATE_MCS_1_INDEX;
1807                 IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n");
1808                 goto tweaked;
1809         }
1810
1811         return false;
1812
1813 tweaked:
1814         rs_set_expected_tpt_table(lq_sta, tbl);
1815         rs_rate_scale_clear_tbl_windows(mvm, tbl);
1816         return true;
1817 }
1818
1819 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1820                                          struct iwl_lq_sta *lq_sta,
1821                                          struct ieee80211_sta *sta,
1822                                          struct iwl_scale_tbl_info *tbl)
1823 {
1824         int i, j, max_rate;
1825         enum rs_column next_col_id;
1826         const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1827         const struct rs_tx_column *next_col;
1828         allow_column_func_t allow_func;
1829         u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
1830         const u16 *expected_tpt_tbl;
1831         u16 tpt, max_expected_tpt;
1832
1833         for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1834                 next_col_id = curr_col->next_columns[i];
1835
1836                 if (next_col_id == RS_COLUMN_INVALID)
1837                         continue;
1838
1839                 if (lq_sta->visited_columns & BIT(next_col_id)) {
1840                         IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1841                                        next_col_id);
1842                         continue;
1843                 }
1844
1845                 next_col = &rs_tx_columns[next_col_id];
1846
1847                 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1848                         IWL_DEBUG_RATE(mvm,
1849                                        "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1850                                        next_col_id, valid_ants, next_col->ant);
1851                         continue;
1852                 }
1853
1854                 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1855                         allow_func = next_col->checks[j];
1856                         if (allow_func && !allow_func(mvm, sta, &tbl->rate,
1857                                                       next_col))
1858                                 break;
1859                 }
1860
1861                 if (j != MAX_COLUMN_CHECKS) {
1862                         IWL_DEBUG_RATE(mvm,
1863                                        "Skip column %d: not allowed (check %d failed)\n",
1864                                        next_col_id, j);
1865
1866                         continue;
1867                 }
1868
1869                 tpt = lq_sta->last_tpt / 100;
1870                 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1871                                                      rs_bw_from_sta_bw(sta));
1872                 if (WARN_ON_ONCE(!expected_tpt_tbl))
1873                         continue;
1874
1875                 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1876                 if (max_rate == IWL_RATE_INVALID) {
1877                         IWL_DEBUG_RATE(mvm,
1878                                        "Skip column %d: no rate is allowed in this column\n",
1879                                        next_col_id);
1880                         continue;
1881                 }
1882
1883                 max_expected_tpt = expected_tpt_tbl[max_rate];
1884                 if (tpt >= max_expected_tpt) {
1885                         IWL_DEBUG_RATE(mvm,
1886                                        "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1887                                        next_col_id, max_expected_tpt, tpt);
1888                         continue;
1889                 }
1890
1891                 IWL_DEBUG_RATE(mvm,
1892                                "Found potential column %d. Max expected %d current %d\n",
1893                                next_col_id, max_expected_tpt, tpt);
1894                 break;
1895         }
1896
1897         if (i == MAX_NEXT_COLUMNS)
1898                 return RS_COLUMN_INVALID;
1899
1900         return next_col_id;
1901 }
1902
1903 static int rs_switch_to_column(struct iwl_mvm *mvm,
1904                                struct iwl_lq_sta *lq_sta,
1905                                struct ieee80211_sta *sta,
1906                                enum rs_column col_id)
1907 {
1908         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1909         struct iwl_scale_tbl_info *search_tbl =
1910                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1911         struct rs_rate *rate = &search_tbl->rate;
1912         const struct rs_tx_column *column = &rs_tx_columns[col_id];
1913         const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1914         unsigned long rate_mask = 0;
1915         u32 rate_idx = 0;
1916
1917         memcpy(search_tbl, tbl, offsetof(struct iwl_scale_tbl_info, win));
1918
1919         rate->sgi = column->sgi;
1920         rate->ant = column->ant;
1921
1922         if (column->mode == RS_LEGACY) {
1923                 if (lq_sta->band == NL80211_BAND_5GHZ)
1924                         rate->type = LQ_LEGACY_A;
1925                 else
1926                         rate->type = LQ_LEGACY_G;
1927
1928                 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1929                 rate->ldpc = false;
1930                 rate_mask = lq_sta->active_legacy_rate;
1931         } else if (column->mode == RS_SISO) {
1932                 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1933                 rate_mask = lq_sta->active_siso_rate;
1934         } else if (column->mode == RS_MIMO2) {
1935                 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1936                 rate_mask = lq_sta->active_mimo2_rate;
1937         } else {
1938                 WARN_ONCE(1, "Bad column mode");
1939         }
1940
1941         if (column->mode != RS_LEGACY) {
1942                 rate->bw = rs_bw_from_sta_bw(sta);
1943                 rate->ldpc = lq_sta->ldpc;
1944         }
1945
1946         search_tbl->column = col_id;
1947         rs_set_expected_tpt_table(lq_sta, search_tbl);
1948
1949         lq_sta->visited_columns |= BIT(col_id);
1950
1951         /* Get the best matching rate if we're changing modes. e.g.
1952          * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1953          */
1954         if (curr_column->mode != column->mode) {
1955                 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1956                                             rate_mask, rate->index);
1957
1958                 if ((rate_idx == IWL_RATE_INVALID) ||
1959                     !(BIT(rate_idx) & rate_mask)) {
1960                         IWL_DEBUG_RATE(mvm,
1961                                        "can not switch with index %d"
1962                                        " rate mask %lx\n",
1963                                        rate_idx, rate_mask);
1964
1965                         goto err;
1966                 }
1967
1968                 rate->index = rate_idx;
1969         }
1970
1971         IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1972                        col_id, rate->index);
1973
1974         return 0;
1975
1976 err:
1977         rate->type = LQ_NONE;
1978         return -1;
1979 }
1980
1981 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1982                                          struct iwl_scale_tbl_info *tbl,
1983                                          s32 sr, int low, int high,
1984                                          int current_tpt,
1985                                          int low_tpt, int high_tpt)
1986 {
1987         enum rs_action action = RS_ACTION_STAY;
1988
1989         if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
1990             (current_tpt == 0)) {
1991                 IWL_DEBUG_RATE(mvm,
1992                                "Decrease rate because of low SR\n");
1993                 return RS_ACTION_DOWNSCALE;
1994         }
1995
1996         if ((low_tpt == IWL_INVALID_VALUE) &&
1997             (high_tpt == IWL_INVALID_VALUE) &&
1998             (high != IWL_RATE_INVALID)) {
1999                 IWL_DEBUG_RATE(mvm,
2000                                "No data about high/low rates. Increase rate\n");
2001                 return RS_ACTION_UPSCALE;
2002         }
2003
2004         if ((high_tpt == IWL_INVALID_VALUE) &&
2005             (high != IWL_RATE_INVALID) &&
2006             (low_tpt != IWL_INVALID_VALUE) &&
2007             (low_tpt < current_tpt)) {
2008                 IWL_DEBUG_RATE(mvm,
2009                                "No data about high rate and low rate is worse. Increase rate\n");
2010                 return RS_ACTION_UPSCALE;
2011         }
2012
2013         if ((high_tpt != IWL_INVALID_VALUE) &&
2014             (high_tpt > current_tpt)) {
2015                 IWL_DEBUG_RATE(mvm,
2016                                "Higher rate is better. Increate rate\n");
2017                 return RS_ACTION_UPSCALE;
2018         }
2019
2020         if ((low_tpt != IWL_INVALID_VALUE) &&
2021             (high_tpt != IWL_INVALID_VALUE) &&
2022             (low_tpt < current_tpt) &&
2023             (high_tpt < current_tpt)) {
2024                 IWL_DEBUG_RATE(mvm,
2025                                "Both high and low are worse. Maintain rate\n");
2026                 return RS_ACTION_STAY;
2027         }
2028
2029         if ((low_tpt != IWL_INVALID_VALUE) &&
2030             (low_tpt > current_tpt)) {
2031                 IWL_DEBUG_RATE(mvm,
2032                                "Lower rate is better\n");
2033                 action = RS_ACTION_DOWNSCALE;
2034                 goto out;
2035         }
2036
2037         if ((low_tpt == IWL_INVALID_VALUE) &&
2038             (low != IWL_RATE_INVALID)) {
2039                 IWL_DEBUG_RATE(mvm,
2040                                "No data about lower rate\n");
2041                 action = RS_ACTION_DOWNSCALE;
2042                 goto out;
2043         }
2044
2045         IWL_DEBUG_RATE(mvm, "Maintain rate\n");
2046
2047 out:
2048         if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
2049                 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
2050                         IWL_DEBUG_RATE(mvm,
2051                                        "SR is above NO DECREASE. Avoid downscale\n");
2052                         action = RS_ACTION_STAY;
2053                 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
2054                         IWL_DEBUG_RATE(mvm,
2055                                        "Current TPT is higher than max expected in low rate. Avoid downscale\n");
2056                         action = RS_ACTION_STAY;
2057                 } else {
2058                         IWL_DEBUG_RATE(mvm, "Decrease rate\n");
2059                 }
2060         }
2061
2062         return action;
2063 }
2064
2065 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2066                           struct iwl_lq_sta *lq_sta)
2067 {
2068         /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
2069          * supports STBC of at least 1*SS
2070          */
2071         if (!lq_sta->stbc_capable)
2072                 return false;
2073
2074         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
2075                 return false;
2076
2077         return true;
2078 }
2079
2080 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
2081                                 int *weaker, int *stronger)
2082 {
2083         *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
2084         if (*weaker > TPC_MAX_REDUCTION)
2085                 *weaker = TPC_INVALID;
2086
2087         *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
2088         if (*stronger < 0)
2089                 *stronger = TPC_INVALID;
2090 }
2091
2092 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
2093                            struct rs_rate *rate, enum nl80211_band band)
2094 {
2095         int index = rate->index;
2096         bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
2097         bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
2098                                 !vif->bss_conf.ps);
2099
2100         IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
2101                        cam, sta_ps_disabled);
2102         /*
2103          * allow tpc only if power management is enabled, or bt coex
2104          * activity grade allows it and we are on 2.4Ghz.
2105          */
2106         if ((cam || sta_ps_disabled) &&
2107             !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
2108                 return false;
2109
2110         IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
2111         if (is_legacy(rate))
2112                 return index == IWL_RATE_54M_INDEX;
2113         if (is_ht(rate))
2114                 return index == IWL_RATE_MCS_7_INDEX;
2115         if (is_vht(rate))
2116                 return index == IWL_RATE_MCS_7_INDEX ||
2117                        index == IWL_RATE_MCS_8_INDEX ||
2118                        index == IWL_RATE_MCS_9_INDEX;
2119
2120         WARN_ON_ONCE(1);
2121         return false;
2122 }
2123
2124 enum tpc_action {
2125         TPC_ACTION_STAY,
2126         TPC_ACTION_DECREASE,
2127         TPC_ACTION_INCREASE,
2128         TPC_ACTION_NO_RESTIRCTION,
2129 };
2130
2131 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
2132                                          s32 sr, int weak, int strong,
2133                                          int current_tpt,
2134                                          int weak_tpt, int strong_tpt)
2135 {
2136         /* stay until we have valid tpt */
2137         if (current_tpt == IWL_INVALID_VALUE) {
2138                 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
2139                 return TPC_ACTION_STAY;
2140         }
2141
2142         /* Too many failures, increase txp */
2143         if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
2144             current_tpt == 0) {
2145                 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
2146                 return TPC_ACTION_NO_RESTIRCTION;
2147         }
2148
2149         /* try decreasing first if applicable */
2150         if (sr >= RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
2151             weak != TPC_INVALID) {
2152                 if (weak_tpt == IWL_INVALID_VALUE &&
2153                     (strong_tpt == IWL_INVALID_VALUE ||
2154                      current_tpt >= strong_tpt)) {
2155                         IWL_DEBUG_RATE(mvm,
2156                                        "no weak txp measurement. decrease txp\n");
2157                         return TPC_ACTION_DECREASE;
2158                 }
2159
2160                 if (weak_tpt > current_tpt) {
2161                         IWL_DEBUG_RATE(mvm,
2162                                        "lower txp has better tpt. decrease txp\n");
2163                         return TPC_ACTION_DECREASE;
2164                 }
2165         }
2166
2167         /* next, increase if needed */
2168         if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
2169             strong != TPC_INVALID) {
2170                 if (weak_tpt == IWL_INVALID_VALUE &&
2171                     strong_tpt != IWL_INVALID_VALUE &&
2172                     current_tpt < strong_tpt) {
2173                         IWL_DEBUG_RATE(mvm,
2174                                        "higher txp has better tpt. increase txp\n");
2175                         return TPC_ACTION_INCREASE;
2176                 }
2177
2178                 if (weak_tpt < current_tpt &&
2179                     (strong_tpt == IWL_INVALID_VALUE ||
2180                      strong_tpt > current_tpt)) {
2181                         IWL_DEBUG_RATE(mvm,
2182                                        "lower txp has worse tpt. increase txp\n");
2183                         return TPC_ACTION_INCREASE;
2184                 }
2185         }
2186
2187         IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
2188         return TPC_ACTION_STAY;
2189 }
2190
2191 static bool rs_tpc_perform(struct iwl_mvm *mvm,
2192                            struct ieee80211_sta *sta,
2193                            struct iwl_lq_sta *lq_sta,
2194                            struct iwl_scale_tbl_info *tbl)
2195 {
2196         struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
2197         struct ieee80211_vif *vif = mvm_sta->vif;
2198         struct ieee80211_chanctx_conf *chanctx_conf;
2199         enum nl80211_band band;
2200         struct iwl_rate_scale_data *window;
2201         struct rs_rate *rate = &tbl->rate;
2202         enum tpc_action action;
2203         s32 sr;
2204         u8 cur = lq_sta->lq.reduced_tpc;
2205         int current_tpt;
2206         int weak, strong;
2207         int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
2208
2209 #ifdef CONFIG_MAC80211_DEBUGFS
2210         if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
2211                 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
2212                                lq_sta->pers.dbg_fixed_txp_reduction);
2213                 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
2214                 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
2215         }
2216 #endif
2217
2218         rcu_read_lock();
2219         chanctx_conf = rcu_dereference(vif->chanctx_conf);
2220         if (WARN_ON(!chanctx_conf))
2221                 band = NUM_NL80211_BANDS;
2222         else
2223                 band = chanctx_conf->def.chan->band;
2224         rcu_read_unlock();
2225
2226         if (!rs_tpc_allowed(mvm, vif, rate, band)) {
2227                 IWL_DEBUG_RATE(mvm,
2228                                "tpc is not allowed. remove txp restrictions\n");
2229                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2230                 return cur != TPC_NO_REDUCTION;
2231         }
2232
2233         rs_get_adjacent_txp(mvm, cur, &weak, &strong);
2234
2235         /* Collect measured throughputs for current and adjacent rates */
2236         window = tbl->tpc_win;
2237         sr = window[cur].success_ratio;
2238         current_tpt = window[cur].average_tpt;
2239         if (weak != TPC_INVALID)
2240                 weak_tpt = window[weak].average_tpt;
2241         if (strong != TPC_INVALID)
2242                 strong_tpt = window[strong].average_tpt;
2243
2244         IWL_DEBUG_RATE(mvm,
2245                        "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
2246                        cur, current_tpt, sr, weak, strong,
2247                        weak_tpt, strong_tpt);
2248
2249         action = rs_get_tpc_action(mvm, sr, weak, strong,
2250                                    current_tpt, weak_tpt, strong_tpt);
2251
2252         /* override actions if we are on the edge */
2253         if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
2254                 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
2255                 action = TPC_ACTION_STAY;
2256         } else if (strong == TPC_INVALID &&
2257                    (action == TPC_ACTION_INCREASE ||
2258                     action == TPC_ACTION_NO_RESTIRCTION)) {
2259                 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2260                 action = TPC_ACTION_STAY;
2261         }
2262
2263         switch (action) {
2264         case TPC_ACTION_DECREASE:
2265                 lq_sta->lq.reduced_tpc = weak;
2266                 return true;
2267         case TPC_ACTION_INCREASE:
2268                 lq_sta->lq.reduced_tpc = strong;
2269                 return true;
2270         case TPC_ACTION_NO_RESTIRCTION:
2271                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2272                 return true;
2273         case TPC_ACTION_STAY:
2274                 /* do nothing */
2275                 break;
2276         }
2277         return false;
2278 }
2279
2280 /*
2281  * Do rate scaling and search for new modulation mode.
2282  */
2283 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2284                                   struct ieee80211_sta *sta,
2285                                   struct iwl_lq_sta *lq_sta,
2286                                   int tid, bool ndp)
2287 {
2288         int low = IWL_RATE_INVALID;
2289         int high = IWL_RATE_INVALID;
2290         int index;
2291         struct iwl_rate_scale_data *window = NULL;
2292         int current_tpt = IWL_INVALID_VALUE;
2293         int low_tpt = IWL_INVALID_VALUE;
2294         int high_tpt = IWL_INVALID_VALUE;
2295         u32 fail_count;
2296         enum rs_action scale_action = RS_ACTION_STAY;
2297         u16 rate_mask;
2298         u8 update_lq = 0;
2299         struct iwl_scale_tbl_info *tbl, *tbl1;
2300         u8 active_tbl = 0;
2301         u8 done_search = 0;
2302         u16 high_low;
2303         s32 sr;
2304         u8 prev_agg = lq_sta->is_agg;
2305         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2306         struct rs_rate *rate;
2307
2308         lq_sta->is_agg = !!mvmsta->agg_tids;
2309
2310         /*
2311          * Select rate-scale / modulation-mode table to work with in
2312          * the rest of this function:  "search" if searching for better
2313          * modulation mode, or "active" if doing rate scaling within a mode.
2314          */
2315         if (!lq_sta->search_better_tbl)
2316                 active_tbl = lq_sta->active_tbl;
2317         else
2318                 active_tbl = 1 - lq_sta->active_tbl;
2319
2320         tbl = &(lq_sta->lq_info[active_tbl]);
2321         rate = &tbl->rate;
2322
2323         if (prev_agg != lq_sta->is_agg) {
2324                 IWL_DEBUG_RATE(mvm,
2325                                "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2326                                prev_agg, lq_sta->is_agg);
2327                 rs_set_expected_tpt_table(lq_sta, tbl);
2328                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2329         }
2330
2331         /* current tx rate */
2332         index = rate->index;
2333
2334         /* rates available for this association, and for modulation mode */
2335         rate_mask = rs_get_supported_rates(lq_sta, rate);
2336
2337         if (!(BIT(index) & rate_mask)) {
2338                 IWL_ERR(mvm, "Current Rate is not valid\n");
2339                 if (lq_sta->search_better_tbl) {
2340                         /* revert to active table if search table is not valid*/
2341                         rate->type = LQ_NONE;
2342                         lq_sta->search_better_tbl = 0;
2343                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2344                         rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2345                 }
2346                 return;
2347         }
2348
2349         /* Get expected throughput table and history window for current rate */
2350         if (!tbl->expected_tpt) {
2351                 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2352                 return;
2353         }
2354
2355         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2356         window = &(tbl->win[index]);
2357
2358         /*
2359          * If there is not enough history to calculate actual average
2360          * throughput, keep analyzing results of more tx frames, without
2361          * changing rate or mode (bypass most of the rest of this function).
2362          * Set up new rate table in uCode only if old rate is not supported
2363          * in current association (use new rate found above).
2364          */
2365         fail_count = window->counter - window->success_counter;
2366         if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2367             (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
2368                 IWL_DEBUG_RATE(mvm,
2369                                "%s: Test Window: succ %d total %d\n",
2370                                rs_pretty_rate(rate),
2371                                window->success_counter, window->counter);
2372
2373                 /* Can't calculate this yet; not enough history */
2374                 window->average_tpt = IWL_INVALID_VALUE;
2375
2376                 /* Should we stay with this modulation mode,
2377                  * or search for a new one? */
2378                 rs_stay_in_table(lq_sta, false);
2379
2380                 return;
2381         }
2382
2383         /* If we are searching for better modulation mode, check success. */
2384         if (lq_sta->search_better_tbl) {
2385                 /* If good success, continue using the "search" mode;
2386                  * no need to send new link quality command, since we're
2387                  * continuing to use the setup that we've been trying. */
2388                 if (window->average_tpt > lq_sta->last_tpt) {
2389                         IWL_DEBUG_RATE(mvm,
2390                                        "SWITCHING TO NEW TABLE SR: %d "
2391                                        "cur-tpt %d old-tpt %d\n",
2392                                        window->success_ratio,
2393                                        window->average_tpt,
2394                                        lq_sta->last_tpt);
2395
2396                         /* Swap tables; "search" becomes "active" */
2397                         lq_sta->active_tbl = active_tbl;
2398                         current_tpt = window->average_tpt;
2399                 /* Else poor success; go back to mode in "active" table */
2400                 } else {
2401                         IWL_DEBUG_RATE(mvm,
2402                                        "GOING BACK TO THE OLD TABLE: SR %d "
2403                                        "cur-tpt %d old-tpt %d\n",
2404                                        window->success_ratio,
2405                                        window->average_tpt,
2406                                        lq_sta->last_tpt);
2407
2408                         /* Nullify "search" table */
2409                         rate->type = LQ_NONE;
2410
2411                         /* Revert to "active" table */
2412                         active_tbl = lq_sta->active_tbl;
2413                         tbl = &(lq_sta->lq_info[active_tbl]);
2414
2415                         /* Revert to "active" rate and throughput info */
2416                         index = tbl->rate.index;
2417                         current_tpt = lq_sta->last_tpt;
2418
2419                         /* Need to set up a new rate table in uCode */
2420                         update_lq = 1;
2421                 }
2422
2423                 /* Either way, we've made a decision; modulation mode
2424                  * search is done, allow rate adjustment next time. */
2425                 lq_sta->search_better_tbl = 0;
2426                 done_search = 1;        /* Don't switch modes below! */
2427                 goto lq_update;
2428         }
2429
2430         /* (Else) not in search of better modulation mode, try for better
2431          * starting rate, while staying in this mode. */
2432         high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2433         low = high_low & 0xff;
2434         high = (high_low >> 8) & 0xff;
2435
2436         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2437
2438         sr = window->success_ratio;
2439
2440         /* Collect measured throughputs for current and adjacent rates */
2441         current_tpt = window->average_tpt;
2442         if (low != IWL_RATE_INVALID)
2443                 low_tpt = tbl->win[low].average_tpt;
2444         if (high != IWL_RATE_INVALID)
2445                 high_tpt = tbl->win[high].average_tpt;
2446
2447         IWL_DEBUG_RATE(mvm,
2448                        "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2449                        rs_pretty_rate(rate), current_tpt, sr,
2450                        low, high, low_tpt, high_tpt);
2451
2452         scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2453                                           current_tpt, low_tpt, high_tpt);
2454
2455         /* Force a search in case BT doesn't like us being in MIMO */
2456         if (is_mimo(rate) &&
2457             !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2458                 IWL_DEBUG_RATE(mvm,
2459                                "BT Coex forbids MIMO. Search for new config\n");
2460                 rs_stay_in_table(lq_sta, true);
2461                 goto lq_update;
2462         }
2463
2464         switch (scale_action) {
2465         case RS_ACTION_DOWNSCALE:
2466                 /* Decrease starting rate, update uCode's rate table */
2467                 if (low != IWL_RATE_INVALID) {
2468                         update_lq = 1;
2469                         index = low;
2470                 } else {
2471                         IWL_DEBUG_RATE(mvm,
2472                                        "At the bottom rate. Can't decrease\n");
2473                 }
2474
2475                 break;
2476         case RS_ACTION_UPSCALE:
2477                 /* Increase starting rate, update uCode's rate table */
2478                 if (high != IWL_RATE_INVALID) {
2479                         update_lq = 1;
2480                         index = high;
2481                 } else {
2482                         IWL_DEBUG_RATE(mvm,
2483                                        "At the top rate. Can't increase\n");
2484                 }
2485
2486                 break;
2487         case RS_ACTION_STAY:
2488                 /* No change */
2489                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2490                         update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2491                 break;
2492         default:
2493                 break;
2494         }
2495
2496 lq_update:
2497         /* Replace uCode's rate table for the destination station. */
2498         if (update_lq) {
2499                 tbl->rate.index = index;
2500                 if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK)
2501                         rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action);
2502                 rs_set_amsdu_len(mvm, sta, tbl, scale_action);
2503                 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2504         }
2505
2506         rs_stay_in_table(lq_sta, false);
2507
2508         /*
2509          * Search for new modulation mode if we're:
2510          * 1)  Not changing rates right now
2511          * 2)  Not just finishing up a search
2512          * 3)  Allowing a new search
2513          */
2514         if (!update_lq && !done_search &&
2515             lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2516             && window->counter) {
2517                 enum rs_column next_column;
2518
2519                 /* Save current throughput to compare with "search" throughput*/
2520                 lq_sta->last_tpt = current_tpt;
2521
2522                 IWL_DEBUG_RATE(mvm,
2523                                "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2524                                update_lq, done_search, lq_sta->rs_state,
2525                                window->counter);
2526
2527                 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2528                 if (next_column != RS_COLUMN_INVALID) {
2529                         int ret = rs_switch_to_column(mvm, lq_sta, sta,
2530                                                       next_column);
2531                         if (!ret)
2532                                 lq_sta->search_better_tbl = 1;
2533                 } else {
2534                         IWL_DEBUG_RATE(mvm,
2535                                        "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2536                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2537                 }
2538
2539                 /* If new "search" mode was selected, set up in uCode table */
2540                 if (lq_sta->search_better_tbl) {
2541                         /* Access the "search" table, clear its history. */
2542                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2543                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
2544
2545                         /* Use new "search" start rate */
2546                         index = tbl->rate.index;
2547
2548                         rs_dump_rate(mvm, &tbl->rate,
2549                                      "Switch to SEARCH TABLE:");
2550                         rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2551                 } else {
2552                         done_search = 1;
2553                 }
2554         }
2555
2556         if (!ndp)
2557                 rs_tl_turn_on_agg(mvm, mvmsta, tid, lq_sta, sta);
2558
2559         if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2560                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2561                 rs_set_stay_in_table(mvm, is_legacy(&tbl1->rate), lq_sta);
2562         }
2563 }
2564
2565 struct rs_init_rate_info {
2566         s8 rssi;
2567         u8 rate_idx;
2568 };
2569
2570 static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = {
2571         { -60, IWL_RATE_54M_INDEX },
2572         { -64, IWL_RATE_48M_INDEX },
2573         { -68, IWL_RATE_36M_INDEX },
2574         { -80, IWL_RATE_24M_INDEX },
2575         { -84, IWL_RATE_18M_INDEX },
2576         { -85, IWL_RATE_12M_INDEX },
2577         { -86, IWL_RATE_11M_INDEX },
2578         { -88, IWL_RATE_5M_INDEX  },
2579         { -90, IWL_RATE_2M_INDEX  },
2580         { S8_MIN, IWL_RATE_1M_INDEX },
2581 };
2582
2583 static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = {
2584         { -60, IWL_RATE_54M_INDEX },
2585         { -64, IWL_RATE_48M_INDEX },
2586         { -72, IWL_RATE_36M_INDEX },
2587         { -80, IWL_RATE_24M_INDEX },
2588         { -84, IWL_RATE_18M_INDEX },
2589         { -85, IWL_RATE_12M_INDEX },
2590         { -87, IWL_RATE_9M_INDEX  },
2591         { S8_MIN, IWL_RATE_6M_INDEX },
2592 };
2593
2594 static const struct rs_init_rate_info rs_optimal_rates_ht[] = {
2595         { -60, IWL_RATE_MCS_7_INDEX },
2596         { -64, IWL_RATE_MCS_6_INDEX },
2597         { -68, IWL_RATE_MCS_5_INDEX },
2598         { -72, IWL_RATE_MCS_4_INDEX },
2599         { -80, IWL_RATE_MCS_3_INDEX },
2600         { -84, IWL_RATE_MCS_2_INDEX },
2601         { -85, IWL_RATE_MCS_1_INDEX },
2602         { S8_MIN, IWL_RATE_MCS_0_INDEX},
2603 };
2604
2605 /* MCS index 9 is not valid for 20MHz VHT channel width,
2606  * but is ok for 40, 80 and 160MHz channels.
2607  */
2608 static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = {
2609         { -60, IWL_RATE_MCS_8_INDEX },
2610         { -64, IWL_RATE_MCS_7_INDEX },
2611         { -68, IWL_RATE_MCS_6_INDEX },
2612         { -72, IWL_RATE_MCS_5_INDEX },
2613         { -80, IWL_RATE_MCS_4_INDEX },
2614         { -84, IWL_RATE_MCS_3_INDEX },
2615         { -85, IWL_RATE_MCS_2_INDEX },
2616         { -87, IWL_RATE_MCS_1_INDEX },
2617         { S8_MIN, IWL_RATE_MCS_0_INDEX},
2618 };
2619
2620 static const struct rs_init_rate_info rs_optimal_rates_vht[] = {
2621         { -60, IWL_RATE_MCS_9_INDEX },
2622         { -64, IWL_RATE_MCS_8_INDEX },
2623         { -68, IWL_RATE_MCS_7_INDEX },
2624         { -72, IWL_RATE_MCS_6_INDEX },
2625         { -80, IWL_RATE_MCS_5_INDEX },
2626         { -84, IWL_RATE_MCS_4_INDEX },
2627         { -85, IWL_RATE_MCS_3_INDEX },
2628         { -87, IWL_RATE_MCS_2_INDEX },
2629         { -88, IWL_RATE_MCS_1_INDEX },
2630         { S8_MIN, IWL_RATE_MCS_0_INDEX },
2631 };
2632
2633 #define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */
2634
2635 /* Init the optimal rate based on STA caps
2636  * This combined with rssi is used to report the last tx rate
2637  * to userspace when we haven't transmitted enough frames.
2638  */
2639 static void rs_init_optimal_rate(struct iwl_mvm *mvm,
2640                                  struct ieee80211_sta *sta,
2641                                  struct iwl_lq_sta *lq_sta)
2642 {
2643         struct rs_rate *rate = &lq_sta->optimal_rate;
2644
2645         if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID)
2646                 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
2647         else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID)
2648                 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
2649         else if (lq_sta->band == NL80211_BAND_5GHZ)
2650                 rate->type = LQ_LEGACY_A;
2651         else
2652                 rate->type = LQ_LEGACY_G;
2653
2654         rate->bw = rs_bw_from_sta_bw(sta);
2655         rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL);
2656
2657         /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */
2658
2659         if (is_mimo(rate)) {
2660                 lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate;
2661         } else if (is_siso(rate)) {
2662                 lq_sta->optimal_rate_mask = lq_sta->active_siso_rate;
2663         } else {
2664                 lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate;
2665
2666                 if (lq_sta->band == NL80211_BAND_5GHZ) {
2667                         lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy;
2668                         lq_sta->optimal_nentries =
2669                                 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2670                 } else {
2671                         lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy;
2672                         lq_sta->optimal_nentries =
2673                                 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2674                 }
2675         }
2676
2677         if (is_vht(rate)) {
2678                 if (rate->bw == RATE_MCS_CHAN_WIDTH_20) {
2679                         lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz;
2680                         lq_sta->optimal_nentries =
2681                                 ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2682                 } else {
2683                         lq_sta->optimal_rates = rs_optimal_rates_vht;
2684                         lq_sta->optimal_nentries =
2685                                 ARRAY_SIZE(rs_optimal_rates_vht);
2686                 }
2687         } else if (is_ht(rate)) {
2688                 lq_sta->optimal_rates = rs_optimal_rates_ht;
2689                 lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2690         }
2691 }
2692
2693 /* Compute the optimal rate index based on RSSI */
2694 static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm,
2695                                            struct iwl_lq_sta *lq_sta)
2696 {
2697         struct rs_rate *rate = &lq_sta->optimal_rate;
2698         int i;
2699
2700         rate->index = find_first_bit(&lq_sta->optimal_rate_mask,
2701                                      BITS_PER_LONG);
2702
2703         for (i = 0; i < lq_sta->optimal_nentries; i++) {
2704                 int rate_idx = lq_sta->optimal_rates[i].rate_idx;
2705
2706                 if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) &&
2707                     (BIT(rate_idx) & lq_sta->optimal_rate_mask)) {
2708                         rate->index = rate_idx;
2709                         break;
2710                 }
2711         }
2712
2713         return rate;
2714 }
2715
2716 /* Choose an initial legacy rate and antenna to use based on the RSSI
2717  * of last Rx
2718  */
2719 static void rs_get_initial_rate(struct iwl_mvm *mvm,
2720                                 struct ieee80211_sta *sta,
2721                                 struct iwl_lq_sta *lq_sta,
2722                                 enum nl80211_band band,
2723                                 struct rs_rate *rate)
2724 {
2725         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2726         int i, nentries;
2727         unsigned long active_rate;
2728         s8 best_rssi = S8_MIN;
2729         u8 best_ant = ANT_NONE;
2730         u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2731         const struct rs_init_rate_info *initial_rates;
2732
2733         for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2734                 if (!(lq_sta->pers.chains & BIT(i)))
2735                         continue;
2736
2737                 if (lq_sta->pers.chain_signal[i] > best_rssi) {
2738                         best_rssi = lq_sta->pers.chain_signal[i];
2739                         best_ant = BIT(i);
2740                 }
2741         }
2742
2743         IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2744                        rs_pretty_ant(best_ant), best_rssi);
2745
2746         if (best_ant != ANT_A && best_ant != ANT_B)
2747                 rate->ant = first_antenna(valid_tx_ant);
2748         else
2749                 rate->ant = best_ant;
2750
2751         rate->sgi = false;
2752         rate->ldpc = false;
2753         rate->bw = RATE_MCS_CHAN_WIDTH_20;
2754
2755         rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2756                                      BITS_PER_LONG);
2757
2758         if (band == NL80211_BAND_5GHZ) {
2759                 rate->type = LQ_LEGACY_A;
2760                 initial_rates = rs_optimal_rates_5ghz_legacy;
2761                 nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2762         } else {
2763                 rate->type = LQ_LEGACY_G;
2764                 initial_rates = rs_optimal_rates_24ghz_legacy;
2765                 nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2766         }
2767
2768         if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE)
2769                 goto out;
2770
2771         /* Start from a higher rate if the corresponding debug capability
2772          * is enabled. The rate is chosen according to AP capabilities.
2773          * In case of VHT/HT when the rssi is low fallback to the case of
2774          * legacy rates.
2775          */
2776         if (sta->vht_cap.vht_supported &&
2777             best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2778                 /*
2779                  * In AP mode, when a new station associates, rs is initialized
2780                  * immediately upon association completion, before the phy
2781                  * context is updated with the association parameters, so the
2782                  * sta bandwidth might be wider than the phy context allows.
2783                  * To avoid this issue, always initialize rs with 20mhz
2784                  * bandwidth rate, and after authorization, when the phy context
2785                  * is already up-to-date, re-init rs with the correct bw.
2786                  */
2787                 u32 bw = mvmsta->sta_state < IEEE80211_STA_AUTHORIZED ?
2788                                 RATE_MCS_CHAN_WIDTH_20 : rs_bw_from_sta_bw(sta);
2789
2790                 switch (bw) {
2791                 case RATE_MCS_CHAN_WIDTH_40:
2792                 case RATE_MCS_CHAN_WIDTH_80:
2793                 case RATE_MCS_CHAN_WIDTH_160:
2794                         initial_rates = rs_optimal_rates_vht;
2795                         nentries = ARRAY_SIZE(rs_optimal_rates_vht);
2796                         break;
2797                 case RATE_MCS_CHAN_WIDTH_20:
2798                         initial_rates = rs_optimal_rates_vht_20mhz;
2799                         nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2800                         break;
2801                 default:
2802                         IWL_ERR(mvm, "Invalid BW %d\n", sta->bandwidth);
2803                         goto out;
2804                 }
2805
2806                 active_rate = lq_sta->active_siso_rate;
2807                 rate->type = LQ_VHT_SISO;
2808                 rate->bw = bw;
2809         } else if (sta->ht_cap.ht_supported &&
2810                    best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2811                 initial_rates = rs_optimal_rates_ht;
2812                 nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2813                 active_rate = lq_sta->active_siso_rate;
2814                 rate->type = LQ_HT_SISO;
2815         } else {
2816                 active_rate = lq_sta->active_legacy_rate;
2817         }
2818
2819         for (i = 0; i < nentries; i++) {
2820                 int rate_idx = initial_rates[i].rate_idx;
2821
2822                 if ((best_rssi >= initial_rates[i].rssi) &&
2823                     (BIT(rate_idx) & active_rate)) {
2824                         rate->index = rate_idx;
2825                         break;
2826                 }
2827         }
2828
2829 out:
2830         rs_dump_rate(mvm, rate, "INITIAL");
2831 }
2832
2833 /* Save info about RSSI of last Rx */
2834 void rs_update_last_rssi(struct iwl_mvm *mvm,
2835                          struct iwl_mvm_sta *mvmsta,
2836                          struct ieee80211_rx_status *rx_status)
2837 {
2838         struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
2839         int i;
2840
2841         lq_sta->pers.chains = rx_status->chains;
2842         lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2843         lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2844         lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2];
2845         lq_sta->pers.last_rssi = S8_MIN;
2846
2847         for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2848                 if (!(lq_sta->pers.chains & BIT(i)))
2849                         continue;
2850
2851                 if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi)
2852                         lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i];
2853         }
2854 }
2855
2856 /**
2857  * rs_initialize_lq - Initialize a station's hardware rate table
2858  *
2859  * The uCode's station table contains a table of fallback rates
2860  * for automatic fallback during transmission.
2861  *
2862  * NOTE: This sets up a default set of values.  These will be replaced later
2863  *       if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2864  *       rc80211_simple.
2865  *
2866  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2867  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2868  *       which requires station table entry to exist).
2869  */
2870 static void rs_initialize_lq(struct iwl_mvm *mvm,
2871                              struct ieee80211_sta *sta,
2872                              struct iwl_lq_sta *lq_sta,
2873                              enum nl80211_band band, bool update)
2874 {
2875         struct iwl_scale_tbl_info *tbl;
2876         struct rs_rate *rate;
2877         u8 active_tbl = 0;
2878
2879         if (!sta || !lq_sta)
2880                 return;
2881
2882         if (!lq_sta->search_better_tbl)
2883                 active_tbl = lq_sta->active_tbl;
2884         else
2885                 active_tbl = 1 - lq_sta->active_tbl;
2886
2887         tbl = &(lq_sta->lq_info[active_tbl]);
2888         rate = &tbl->rate;
2889
2890         rs_get_initial_rate(mvm, sta, lq_sta, band, rate);
2891         rs_init_optimal_rate(mvm, sta, lq_sta);
2892
2893         WARN_ONCE(rate->ant != ANT_A && rate->ant != ANT_B,
2894                   "ant: 0x%x, chains 0x%x, fw tx ant: 0x%x, nvm tx ant: 0x%x\n",
2895                   rate->ant, lq_sta->pers.chains, mvm->fw->valid_tx_ant,
2896                   mvm->nvm_data ? mvm->nvm_data->valid_tx_ant : ANT_INVALID);
2897
2898         tbl->column = rs_get_column_from_rate(rate);
2899
2900         rs_set_expected_tpt_table(lq_sta, tbl);
2901         rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2902         /* TODO restore station should remember the lq cmd */
2903         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, !update);
2904 }
2905
2906 static void rs_drv_get_rate(void *mvm_r, struct ieee80211_sta *sta,
2907                             void *mvm_sta,
2908                             struct ieee80211_tx_rate_control *txrc)
2909 {
2910         struct iwl_op_mode *op_mode = mvm_r;
2911         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2912         struct sk_buff *skb = txrc->skb;
2913         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2914         struct iwl_lq_sta *lq_sta;
2915         struct rs_rate *optimal_rate;
2916         u32 last_ucode_rate;
2917
2918         if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) {
2919                 /* if vif isn't initialized mvm doesn't know about
2920                  * this station, so don't do anything with the it
2921                  */
2922                 sta = NULL;
2923                 mvm_sta = NULL;
2924         }
2925
2926         /* Send management frames and NO_ACK data using lowest rate. */
2927         if (rate_control_send_low(sta, mvm_sta, txrc))
2928                 return;
2929
2930         if (!mvm_sta)
2931                 return;
2932
2933         lq_sta = mvm_sta;
2934         iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2935                                   info->band, &info->control.rates[0]);
2936         info->control.rates[0].count = 1;
2937
2938         /* Report the optimal rate based on rssi and STA caps if we haven't
2939          * converged yet (too little traffic) or exploring other modulations
2940          */
2941         if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) {
2942                 optimal_rate = rs_get_optimal_rate(mvm, lq_sta);
2943                 last_ucode_rate = ucode_rate_from_rs_rate(mvm,
2944                                                           optimal_rate);
2945                 iwl_mvm_hwrate_to_tx_rate(last_ucode_rate, info->band,
2946                                           &txrc->reported_rate);
2947         }
2948 }
2949
2950 static void *rs_drv_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2951                               gfp_t gfp)
2952 {
2953         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2954         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2955         struct iwl_mvm *mvm  = IWL_OP_MODE_GET_MVM(op_mode);
2956         struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
2957
2958         IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2959
2960         lq_sta->pers.drv = mvm;
2961 #ifdef CONFIG_MAC80211_DEBUGFS
2962         lq_sta->pers.dbg_fixed_rate = 0;
2963         lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2964         lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
2965 #endif
2966         lq_sta->pers.chains = 0;
2967         memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
2968         lq_sta->pers.last_rssi = S8_MIN;
2969
2970         return lq_sta;
2971 }
2972
2973 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2974                                        int nss)
2975 {
2976         u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2977                 (0x3 << (2 * (nss - 1)));
2978         rx_mcs >>= (2 * (nss - 1));
2979
2980         if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2981                 return IWL_RATE_MCS_7_INDEX;
2982         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2983                 return IWL_RATE_MCS_8_INDEX;
2984         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2985                 return IWL_RATE_MCS_9_INDEX;
2986
2987         WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2988         return -1;
2989 }
2990
2991 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2992                                      struct ieee80211_sta_vht_cap *vht_cap,
2993                                      struct iwl_lq_sta *lq_sta)
2994 {
2995         int i;
2996         int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2997
2998         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2999                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
3000                         if (i == IWL_RATE_9M_INDEX)
3001                                 continue;
3002
3003                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
3004                         if (i == IWL_RATE_MCS_9_INDEX &&
3005                             sta->bandwidth == IEEE80211_STA_RX_BW_20)
3006                                 continue;
3007
3008                         lq_sta->active_siso_rate |= BIT(i);
3009                 }
3010         }
3011
3012         if (sta->rx_nss < 2)
3013                 return;
3014
3015         highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
3016         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
3017                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
3018                         if (i == IWL_RATE_9M_INDEX)
3019                                 continue;
3020
3021                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
3022                         if (i == IWL_RATE_MCS_9_INDEX &&
3023                             sta->bandwidth == IEEE80211_STA_RX_BW_20)
3024                                 continue;
3025
3026                         lq_sta->active_mimo2_rate |= BIT(i);
3027                 }
3028         }
3029 }
3030
3031 static void rs_ht_init(struct iwl_mvm *mvm,
3032                        struct ieee80211_sta *sta,
3033                        struct iwl_lq_sta *lq_sta,
3034                        struct ieee80211_sta_ht_cap *ht_cap)
3035 {
3036         /* active_siso_rate mask includes 9 MBits (bit 5),
3037          * and CCK (bits 0-3), supp_rates[] does not;
3038          * shift to convert format, force 9 MBits off.
3039          */
3040         lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
3041         lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
3042         lq_sta->active_siso_rate &= ~((u16)0x2);
3043         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
3044
3045         lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
3046         lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
3047         lq_sta->active_mimo2_rate &= ~((u16)0x2);
3048         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
3049
3050         if (mvm->cfg->ht_params->ldpc &&
3051             (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
3052                 lq_sta->ldpc = true;
3053
3054         if (mvm->cfg->ht_params->stbc &&
3055             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3056             (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC))
3057                 lq_sta->stbc_capable = true;
3058
3059         lq_sta->is_vht = false;
3060 }
3061
3062 static void rs_vht_init(struct iwl_mvm *mvm,
3063                         struct ieee80211_sta *sta,
3064                         struct iwl_lq_sta *lq_sta,
3065                         struct ieee80211_sta_vht_cap *vht_cap)
3066 {
3067         rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
3068
3069         if (mvm->cfg->ht_params->ldpc &&
3070             (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
3071                 lq_sta->ldpc = true;
3072
3073         if (mvm->cfg->ht_params->stbc &&
3074             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3075             (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))
3076                 lq_sta->stbc_capable = true;
3077
3078         if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) &&
3079             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
3080             (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE))
3081                 lq_sta->bfer_capable = true;
3082
3083         lq_sta->is_vht = true;
3084 }
3085
3086 #ifdef CONFIG_IWLWIFI_DEBUGFS
3087 void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm)
3088 {
3089         spin_lock_bh(&mvm->drv_stats_lock);
3090         memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats));
3091         spin_unlock_bh(&mvm->drv_stats_lock);
3092 }
3093
3094 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg)
3095 {
3096         u8 nss = 0;
3097
3098         spin_lock(&mvm->drv_stats_lock);
3099
3100         if (agg)
3101                 mvm->drv_rx_stats.agg_frames++;
3102
3103         mvm->drv_rx_stats.success_frames++;
3104
3105         switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3106         case RATE_MCS_CHAN_WIDTH_20:
3107                 mvm->drv_rx_stats.bw_20_frames++;
3108                 break;
3109         case RATE_MCS_CHAN_WIDTH_40:
3110                 mvm->drv_rx_stats.bw_40_frames++;
3111                 break;
3112         case RATE_MCS_CHAN_WIDTH_80:
3113                 mvm->drv_rx_stats.bw_80_frames++;
3114                 break;
3115         case RATE_MCS_CHAN_WIDTH_160:
3116                 mvm->drv_rx_stats.bw_160_frames++;
3117                 break;
3118         default:
3119                 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
3120         }
3121
3122         if (rate & RATE_MCS_HT_MSK) {
3123                 mvm->drv_rx_stats.ht_frames++;
3124                 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
3125         } else if (rate & RATE_MCS_VHT_MSK) {
3126                 mvm->drv_rx_stats.vht_frames++;
3127                 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
3128                        RATE_VHT_MCS_NSS_POS) + 1;
3129         } else {
3130                 mvm->drv_rx_stats.legacy_frames++;
3131         }
3132
3133         if (nss == 1)
3134                 mvm->drv_rx_stats.siso_frames++;
3135         else if (nss == 2)
3136                 mvm->drv_rx_stats.mimo2_frames++;
3137
3138         if (rate & RATE_MCS_SGI_MSK)
3139                 mvm->drv_rx_stats.sgi_frames++;
3140         else
3141                 mvm->drv_rx_stats.ngi_frames++;
3142
3143         mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate;
3144         mvm->drv_rx_stats.last_frame_idx =
3145                 (mvm->drv_rx_stats.last_frame_idx + 1) %
3146                         ARRAY_SIZE(mvm->drv_rx_stats.last_rates);
3147
3148         spin_unlock(&mvm->drv_stats_lock);
3149 }
3150 #endif
3151
3152 /*
3153  * Called after adding a new station to initialize rate scaling
3154  */
3155 static void rs_drv_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
3156                              enum nl80211_band band, bool update)
3157 {
3158         int i, j;
3159         struct ieee80211_hw *hw = mvm->hw;
3160         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
3161         struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
3162         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3163         struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta.rs_drv;
3164         struct ieee80211_supported_band *sband;
3165         unsigned long supp; /* must be unsigned long for for_each_set_bit */
3166
3167         /* clear all non-persistent lq data */
3168         memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
3169
3170         sband = hw->wiphy->bands[band];
3171
3172         lq_sta->lq.sta_id = mvmsta->sta_id;
3173         mvmsta->amsdu_enabled = 0;
3174         mvmsta->max_amsdu_len = sta->max_amsdu_len;
3175
3176         for (j = 0; j < LQ_SIZE; j++)
3177                 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
3178
3179         lq_sta->flush_timer = 0;
3180         lq_sta->last_tx = jiffies;
3181
3182         IWL_DEBUG_RATE(mvm,
3183                        "LQ: *** rate scale station global init for station %d ***\n",
3184                        mvmsta->sta_id);
3185         /* TODO: what is a good starting rate for STA? About middle? Maybe not
3186          * the lowest or the highest rate.. Could consider using RSSI from
3187          * previous packets? Need to have IEEE 802.1X auth succeed immediately
3188          * after assoc.. */
3189
3190         lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
3191         lq_sta->band = sband->band;
3192         /*
3193          * active legacy rates as per supported rates bitmap
3194          */
3195         supp = sta->supp_rates[sband->band];
3196         lq_sta->active_legacy_rate = 0;
3197         for_each_set_bit(i, &supp, BITS_PER_LONG)
3198                 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
3199
3200         /* TODO: should probably account for rx_highest for both HT/VHT */
3201         if (!vht_cap || !vht_cap->vht_supported)
3202                 rs_ht_init(mvm, sta, lq_sta, ht_cap);
3203         else
3204                 rs_vht_init(mvm, sta, lq_sta, vht_cap);
3205
3206         lq_sta->max_legacy_rate_idx =
3207                 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate);
3208         lq_sta->max_siso_rate_idx =
3209                 rs_get_max_rate_from_mask(lq_sta->active_siso_rate);
3210         lq_sta->max_mimo2_rate_idx =
3211                 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate);
3212
3213         IWL_DEBUG_RATE(mvm,
3214                        "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n",
3215                        lq_sta->active_legacy_rate,
3216                        lq_sta->active_siso_rate,
3217                        lq_sta->active_mimo2_rate,
3218                        lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable,
3219                        lq_sta->bfer_capable);
3220         IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
3221                        lq_sta->max_legacy_rate_idx,
3222                        lq_sta->max_siso_rate_idx,
3223                        lq_sta->max_mimo2_rate_idx);
3224
3225         /* These values will be overridden later */
3226         lq_sta->lq.single_stream_ant_msk =
3227                 first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
3228         lq_sta->lq.dual_stream_ant_msk = ANT_AB;
3229
3230         /* as default allow aggregation for all tids */
3231         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
3232         lq_sta->is_agg = 0;
3233 #ifdef CONFIG_IWLWIFI_DEBUGFS
3234         iwl_mvm_reset_frame_stats(mvm);
3235 #endif
3236         rs_initialize_lq(mvm, sta, lq_sta, band, update);
3237 }
3238
3239 static void rs_drv_rate_update(void *mvm_r,
3240                                struct ieee80211_supported_band *sband,
3241                                struct cfg80211_chan_def *chandef,
3242                                struct ieee80211_sta *sta,
3243                                void *priv_sta, u32 changed)
3244 {
3245         struct iwl_op_mode *op_mode = mvm_r;
3246         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3247         u8 tid;
3248
3249         if (!iwl_mvm_sta_from_mac80211(sta)->vif)
3250                 return;
3251
3252         /* Stop any ongoing aggregations as rs starts off assuming no agg */
3253         for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
3254                 ieee80211_stop_tx_ba_session(sta, tid);
3255
3256         iwl_mvm_rs_rate_init(mvm, sta, sband->band, true);
3257 }
3258
3259 #ifdef CONFIG_MAC80211_DEBUGFS
3260 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
3261                                             struct iwl_lq_cmd *lq_cmd,
3262                                             enum nl80211_band band,
3263                                             u32 ucode_rate)
3264 {
3265         struct rs_rate rate;
3266         int i;
3267         int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
3268         __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
3269         u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3270
3271         for (i = 0; i < num_rates; i++)
3272                 lq_cmd->rs_table[i] = ucode_rate_le32;
3273
3274         if (rs_rate_from_ucode_rate(ucode_rate, band, &rate)) {
3275                 WARN_ON_ONCE(1);
3276                 return;
3277         }
3278
3279         if (is_mimo(&rate))
3280                 lq_cmd->mimo_delim = num_rates - 1;
3281         else
3282                 lq_cmd->mimo_delim = 0;
3283
3284         lq_cmd->reduced_tpc = 0;
3285
3286         if (num_of_ant(ant) == 1)
3287                 lq_cmd->single_stream_ant_msk = ant;
3288
3289         if (!mvm->trans->cfg->gen2)
3290                 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3291         else
3292                 lq_cmd->agg_frame_cnt_limit =
3293                         LINK_QUAL_AGG_FRAME_LIMIT_GEN2_DEF;
3294 }
3295 #endif /* CONFIG_MAC80211_DEBUGFS */
3296
3297 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
3298                                      struct iwl_lq_sta *lq_sta,
3299                                      struct rs_rate *rate,
3300                                      __le32 *rs_table, int *rs_table_index,
3301                                      int num_rates, int num_retries,
3302                                      u8 valid_tx_ant, bool toggle_ant)
3303 {
3304         int i, j;
3305         __le32 ucode_rate;
3306         bool bottom_reached = false;
3307         int prev_rate_idx = rate->index;
3308         int end = LINK_QUAL_MAX_RETRY_NUM;
3309         int index = *rs_table_index;
3310
3311         for (i = 0; i < num_rates && index < end; i++) {
3312                 for (j = 0; j < num_retries && index < end; j++, index++) {
3313                         ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
3314                                                                          rate));
3315                         rs_table[index] = ucode_rate;
3316                         if (toggle_ant)
3317                                 rs_toggle_antenna(valid_tx_ant, rate);
3318                 }
3319
3320                 prev_rate_idx = rate->index;
3321                 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
3322                 if (bottom_reached && !is_legacy(rate))
3323                         break;
3324         }
3325
3326         if (!bottom_reached && !is_legacy(rate))
3327                 rate->index = prev_rate_idx;
3328
3329         *rs_table_index = index;
3330 }
3331
3332 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
3333  * column the rate table should look like this:
3334  *
3335  * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3336  * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3337  * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3338  * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3339  * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3340  * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3341  * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
3342  * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
3343  * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
3344  * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
3345  * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
3346  * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
3347  * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
3348  * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
3349  * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
3350  * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
3351  */
3352 static void rs_build_rates_table(struct iwl_mvm *mvm,
3353                                  struct ieee80211_sta *sta,
3354                                  struct iwl_lq_sta *lq_sta,
3355                                  const struct rs_rate *initial_rate)
3356 {
3357         struct rs_rate rate;
3358         int num_rates, num_retries, index = 0;
3359         u8 valid_tx_ant = 0;
3360         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3361         bool toggle_ant = false;
3362         u32 color;
3363
3364         memcpy(&rate, initial_rate, sizeof(rate));
3365
3366         valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
3367
3368         /* TODO: remove old API when min FW API hits 14 */
3369         if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) &&
3370             rs_stbc_allow(mvm, sta, lq_sta))
3371                 rate.stbc = true;
3372
3373         if (is_siso(&rate)) {
3374                 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
3375                 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3376         } else if (is_mimo(&rate)) {
3377                 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
3378                 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3379         } else {
3380                 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
3381                 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
3382                 toggle_ant = true;
3383         }
3384
3385         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3386                                  num_rates, num_retries, valid_tx_ant,
3387                                  toggle_ant);
3388
3389         rs_get_lower_rate_down_column(lq_sta, &rate);
3390
3391         if (is_siso(&rate)) {
3392                 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
3393                 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
3394                 lq_cmd->mimo_delim = index;
3395         } else if (is_legacy(&rate)) {
3396                 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3397                 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3398         } else {
3399                 WARN_ON_ONCE(1);
3400         }
3401
3402         toggle_ant = true;
3403
3404         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3405                                  num_rates, num_retries, valid_tx_ant,
3406                                  toggle_ant);
3407
3408         rs_get_lower_rate_down_column(lq_sta, &rate);
3409
3410         num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3411         num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3412
3413         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3414                                  num_rates, num_retries, valid_tx_ant,
3415                                  toggle_ant);
3416
3417         /* update the color of the LQ command (as a counter at bits 1-3) */
3418         color = LQ_FLAGS_COLOR_INC(LQ_FLAG_COLOR_GET(lq_cmd->flags));
3419         lq_cmd->flags = LQ_FLAG_COLOR_SET(lq_cmd->flags, color);
3420 }
3421
3422 struct rs_bfer_active_iter_data {
3423         struct ieee80211_sta *exclude_sta;
3424         struct iwl_mvm_sta *bfer_mvmsta;
3425 };
3426
3427 static void rs_bfer_active_iter(void *_data,
3428                                 struct ieee80211_sta *sta)
3429 {
3430         struct rs_bfer_active_iter_data *data = _data;
3431         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3432         struct iwl_lq_cmd *lq_cmd = &mvmsta->lq_sta.rs_drv.lq;
3433         u32 ss_params = le32_to_cpu(lq_cmd->ss_params);
3434
3435         if (sta == data->exclude_sta)
3436                 return;
3437
3438         /* The current sta has BFER allowed */
3439         if (ss_params & LQ_SS_BFER_ALLOWED) {
3440                 WARN_ON_ONCE(data->bfer_mvmsta != NULL);
3441
3442                 data->bfer_mvmsta = mvmsta;
3443         }
3444 }
3445
3446 static int rs_bfer_priority(struct iwl_mvm_sta *sta)
3447 {
3448         int prio = -1;
3449         enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif);
3450
3451         switch (viftype) {
3452         case NL80211_IFTYPE_AP:
3453         case NL80211_IFTYPE_P2P_GO:
3454                 prio = 3;
3455                 break;
3456         case NL80211_IFTYPE_P2P_CLIENT:
3457                 prio = 2;
3458                 break;
3459         case NL80211_IFTYPE_STATION:
3460                 prio = 1;
3461                 break;
3462         default:
3463                 WARN_ONCE(true, "viftype %d sta_id %d", viftype, sta->sta_id);
3464                 prio = -1;
3465         }
3466
3467         return prio;
3468 }
3469
3470 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */
3471 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1,
3472                                 struct iwl_mvm_sta *sta2)
3473 {
3474         int prio1 = rs_bfer_priority(sta1);
3475         int prio2 = rs_bfer_priority(sta2);
3476
3477         if (prio1 > prio2)
3478                 return 1;
3479         if (prio1 < prio2)
3480                 return -1;
3481         return 0;
3482 }
3483
3484 static void rs_set_lq_ss_params(struct iwl_mvm *mvm,
3485                                 struct ieee80211_sta *sta,
3486                                 struct iwl_lq_sta *lq_sta,
3487                                 const struct rs_rate *initial_rate)
3488 {
3489         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3490         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3491         struct rs_bfer_active_iter_data data = {
3492                 .exclude_sta = sta,
3493                 .bfer_mvmsta = NULL,
3494         };
3495         struct iwl_mvm_sta *bfer_mvmsta = NULL;
3496         u32 ss_params = LQ_SS_PARAMS_VALID;
3497
3498         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
3499                 goto out;
3500
3501 #ifdef CONFIG_MAC80211_DEBUGFS
3502         /* Check if forcing the decision is configured.
3503          * Note that SISO is forced by not allowing STBC or BFER
3504          */
3505         if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC)
3506                 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE);
3507         else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER)
3508                 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE);
3509
3510         if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) {
3511                 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n",
3512                                lq_sta->pers.ss_force);
3513                 goto out;
3514         }
3515 #endif
3516
3517         if (lq_sta->stbc_capable)
3518                 ss_params |= LQ_SS_STBC_1SS_ALLOWED;
3519
3520         if (!lq_sta->bfer_capable)
3521                 goto out;
3522
3523         ieee80211_iterate_stations_atomic(mvm->hw,
3524                                           rs_bfer_active_iter,
3525                                           &data);
3526         bfer_mvmsta = data.bfer_mvmsta;
3527
3528         /* This code is safe as it doesn't run concurrently for different
3529          * stations. This is guaranteed by the fact that calls to
3530          * ieee80211_tx_status wouldn't run concurrently for a single HW.
3531          */
3532         if (!bfer_mvmsta) {
3533                 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n");
3534
3535                 ss_params |= LQ_SS_BFER_ALLOWED;
3536                 goto out;
3537         }
3538
3539         IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n",
3540                        bfer_mvmsta->sta_id);
3541
3542         /* Disallow BFER on another STA if active and we're a higher priority */
3543         if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) {
3544                 struct iwl_lq_cmd *bfersta_lq_cmd =
3545                         &bfer_mvmsta->lq_sta.rs_drv.lq;
3546                 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params);
3547
3548                 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED;
3549                 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params);
3550                 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd, false);
3551
3552                 ss_params |= LQ_SS_BFER_ALLOWED;
3553                 IWL_DEBUG_RATE(mvm,
3554                                "Lower priority BFER sta found (%d). Switch BFER\n",
3555                                bfer_mvmsta->sta_id);
3556         }
3557 out:
3558         lq_cmd->ss_params = cpu_to_le32(ss_params);
3559 }
3560
3561 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
3562                            struct ieee80211_sta *sta,
3563                            struct iwl_lq_sta *lq_sta,
3564                            const struct rs_rate *initial_rate)
3565 {
3566         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3567         struct iwl_mvm_sta *mvmsta;
3568         struct iwl_mvm_vif *mvmvif;
3569
3570         lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
3571         lq_cmd->agg_time_limit =
3572                 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
3573
3574 #ifdef CONFIG_MAC80211_DEBUGFS
3575         if (lq_sta->pers.dbg_fixed_rate) {
3576                 rs_build_rates_table_from_fixed(mvm, lq_cmd,
3577                                                 lq_sta->band,
3578                                                 lq_sta->pers.dbg_fixed_rate);
3579                 return;
3580         }
3581 #endif
3582         if (WARN_ON_ONCE(!sta || !initial_rate))
3583                 return;
3584
3585         rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
3586
3587         if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS))
3588                 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate);
3589
3590         mvmsta = iwl_mvm_sta_from_mac80211(sta);
3591         mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
3592
3593         if (num_of_ant(initial_rate->ant) == 1)
3594                 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3595
3596         lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
3597
3598         /*
3599          * In case of low latency, tell the firmware to leave a frame in the
3600          * Tx Fifo so that it can start a transaction in the same TxOP. This
3601          * basically allows the firmware to send bursts.
3602          */
3603         if (iwl_mvm_vif_low_latency(mvmvif))
3604                 lq_cmd->agg_frame_cnt_limit--;
3605
3606         if (mvmsta->vif->p2p)
3607                 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
3608
3609         lq_cmd->agg_time_limit =
3610                         cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
3611 }
3612
3613 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3614 {
3615         return hw->priv;
3616 }
3617
3618 /* rate scale requires free function to be implemented */
3619 static void rs_free(void *mvm_rate)
3620 {
3621         return;
3622 }
3623
3624 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta)
3625 {
3626         struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
3627         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3628
3629         IWL_DEBUG_RATE(mvm, "enter\n");
3630         IWL_DEBUG_RATE(mvm, "leave\n");
3631 }
3632
3633 #ifdef CONFIG_MAC80211_DEBUGFS
3634 int rs_pretty_print_rate(char *buf, int bufsz, const u32 rate)
3635 {
3636
3637         char *type, *bw;
3638         u8 mcs = 0, nss = 0;
3639         u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3640
3641         if (!(rate & RATE_MCS_HT_MSK) &&
3642             !(rate & RATE_MCS_VHT_MSK) &&
3643             !(rate & RATE_MCS_HE_MSK)) {
3644                 int index = iwl_hwrate_to_plcp_idx(rate);
3645
3646                 return scnprintf(buf, bufsz, "Legacy | ANT: %s Rate: %s Mbps\n",
3647                                  rs_pretty_ant(ant),
3648                                  index == IWL_RATE_INVALID ? "BAD" :
3649                                  iwl_rate_mcs[index].mbps);
3650         }
3651
3652         if (rate & RATE_MCS_VHT_MSK) {
3653                 type = "VHT";
3654                 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3655                 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3656                        >> RATE_VHT_MCS_NSS_POS) + 1;
3657         } else if (rate & RATE_MCS_HT_MSK) {
3658                 type = "HT";
3659                 mcs = rate & RATE_HT_MCS_INDEX_MSK;
3660                 nss = ((rate & RATE_HT_MCS_NSS_MSK)
3661                        >> RATE_HT_MCS_NSS_POS) + 1;
3662         } else if (rate & RATE_MCS_HE_MSK) {
3663                 type = "HE";
3664                 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3665                 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3666                        >> RATE_VHT_MCS_NSS_POS) + 1;
3667         } else {
3668                 type = "Unknown"; /* shouldn't happen */
3669         }
3670
3671         switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3672         case RATE_MCS_CHAN_WIDTH_20:
3673                 bw = "20Mhz";
3674                 break;
3675         case RATE_MCS_CHAN_WIDTH_40:
3676                 bw = "40Mhz";
3677                 break;
3678         case RATE_MCS_CHAN_WIDTH_80:
3679                 bw = "80Mhz";
3680                 break;
3681         case RATE_MCS_CHAN_WIDTH_160:
3682                 bw = "160Mhz";
3683                 break;
3684         default:
3685                 bw = "BAD BW";
3686         }
3687
3688         return scnprintf(buf, bufsz,
3689                          "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s\n",
3690                          type, rs_pretty_ant(ant), bw, mcs, nss,
3691                          (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
3692                          (rate & RATE_MCS_STBC_MSK) ? "STBC " : "",
3693                          (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
3694                          (rate & RATE_MCS_BF_MSK) ? "BF " : "");
3695 }
3696
3697 /**
3698  * Program the device to use fixed rate for frame transmit
3699  * This is for debugging/testing only
3700  * once the device start use fixed rate, we need to reload the module
3701  * to being back the normal operation.
3702  */
3703 static void rs_program_fix_rate(struct iwl_mvm *mvm,
3704                                 struct iwl_lq_sta *lq_sta)
3705 {
3706         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
3707         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
3708         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
3709
3710         IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
3711                        lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
3712
3713         if (lq_sta->pers.dbg_fixed_rate) {
3714                 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
3715                 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false);
3716         }
3717 }
3718
3719 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3720                         const char __user *user_buf, size_t count, loff_t *ppos)
3721 {
3722         struct iwl_lq_sta *lq_sta = file->private_data;
3723         struct iwl_mvm *mvm;
3724         char buf[64];
3725         size_t buf_size;
3726         u32 parsed_rate;
3727
3728         mvm = lq_sta->pers.drv;
3729         memset(buf, 0, sizeof(buf));
3730         buf_size = min(count, sizeof(buf) -  1);
3731         if (copy_from_user(buf, user_buf, buf_size))
3732                 return -EFAULT;
3733
3734         if (sscanf(buf, "%x", &parsed_rate) == 1)
3735                 lq_sta->pers.dbg_fixed_rate = parsed_rate;
3736         else
3737                 lq_sta->pers.dbg_fixed_rate = 0;
3738
3739         rs_program_fix_rate(mvm, lq_sta);
3740
3741         return count;
3742 }
3743
3744 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3745                         char __user *user_buf, size_t count, loff_t *ppos)
3746 {
3747         char *buff;
3748         int desc = 0;
3749         int i = 0;
3750         ssize_t ret;
3751         static const size_t bufsz = 2048;
3752
3753         struct iwl_lq_sta *lq_sta = file->private_data;
3754         struct iwl_mvm_sta *mvmsta =
3755                 container_of(lq_sta, struct iwl_mvm_sta, lq_sta.rs_drv);
3756         struct iwl_mvm *mvm;
3757         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3758         struct rs_rate *rate = &tbl->rate;
3759         u32 ss_params;
3760
3761         mvm = lq_sta->pers.drv;
3762         buff = kmalloc(bufsz, GFP_KERNEL);
3763         if (!buff)
3764                 return -ENOMEM;
3765
3766         desc += scnprintf(buff + desc, bufsz - desc,
3767                           "sta_id %d\n", lq_sta->lq.sta_id);
3768         desc += scnprintf(buff + desc, bufsz - desc,
3769                           "failed=%d success=%d rate=0%lX\n",
3770                           lq_sta->total_failed, lq_sta->total_success,
3771                           lq_sta->active_legacy_rate);
3772         desc += scnprintf(buff + desc, bufsz - desc, "fixed rate 0x%X\n",
3773                           lq_sta->pers.dbg_fixed_rate);
3774         desc += scnprintf(buff + desc, bufsz - desc, "valid_tx_ant %s%s%s\n",
3775             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
3776             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "",
3777             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_C) ? "ANT_C" : "");
3778         desc += scnprintf(buff + desc, bufsz - desc, "lq type %s\n",
3779                           (is_legacy(rate)) ? "legacy" :
3780                           is_vht(rate) ? "VHT" : "HT");
3781         if (!is_legacy(rate)) {
3782                 desc += scnprintf(buff + desc, bufsz - desc, " %s",
3783                    (is_siso(rate)) ? "SISO" : "MIMO2");
3784                 desc += scnprintf(buff + desc, bufsz - desc, " %s",
3785                                 (is_ht20(rate)) ? "20MHz" :
3786                                 (is_ht40(rate)) ? "40MHz" :
3787                                 (is_ht80(rate)) ? "80MHz" :
3788                                 (is_ht160(rate)) ? "160MHz" : "BAD BW");
3789                 desc += scnprintf(buff + desc, bufsz - desc, " %s %s %s %s\n",
3790                                 (rate->sgi) ? "SGI" : "NGI",
3791                                 (rate->ldpc) ? "LDPC" : "BCC",
3792                                 (lq_sta->is_agg) ? "AGG on" : "",
3793                                 (mvmsta->amsdu_enabled) ? "AMSDU on" : "");
3794         }
3795         desc += scnprintf(buff + desc, bufsz - desc, "last tx rate=0x%X\n",
3796                         lq_sta->last_rate_n_flags);
3797         desc += scnprintf(buff + desc, bufsz - desc,
3798                         "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3799                         lq_sta->lq.flags,
3800                         lq_sta->lq.mimo_delim,
3801                         lq_sta->lq.single_stream_ant_msk,
3802                         lq_sta->lq.dual_stream_ant_msk);
3803
3804         desc += scnprintf(buff + desc, bufsz - desc,
3805                         "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3806                         le16_to_cpu(lq_sta->lq.agg_time_limit),
3807                         lq_sta->lq.agg_disable_start_th,
3808                         lq_sta->lq.agg_frame_cnt_limit);
3809
3810         desc += scnprintf(buff + desc, bufsz - desc, "reduced tpc=%d\n",
3811                           lq_sta->lq.reduced_tpc);
3812         ss_params = le32_to_cpu(lq_sta->lq.ss_params);
3813         desc += scnprintf(buff + desc, bufsz - desc,
3814                         "single stream params: %s%s%s%s\n",
3815                         (ss_params & LQ_SS_PARAMS_VALID) ?
3816                         "VALID" : "INVALID",
3817                         (ss_params & LQ_SS_BFER_ALLOWED) ?
3818                         ", BFER" : "",
3819                         (ss_params & LQ_SS_STBC_1SS_ALLOWED) ?
3820                         ", STBC" : "",
3821                         (ss_params & LQ_SS_FORCE) ?
3822                         ", FORCE" : "");
3823         desc += scnprintf(buff + desc, bufsz - desc,
3824                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3825                         lq_sta->lq.initial_rate_index[0],
3826                         lq_sta->lq.initial_rate_index[1],
3827                         lq_sta->lq.initial_rate_index[2],
3828                         lq_sta->lq.initial_rate_index[3]);
3829
3830         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3831                 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3832
3833                 desc += scnprintf(buff + desc, bufsz - desc,
3834                                   " rate[%d] 0x%X ", i, r);
3835                 desc += rs_pretty_print_rate(buff + desc, bufsz - desc, r);
3836         }
3837
3838         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3839         kfree(buff);
3840         return ret;
3841 }
3842
3843 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3844         .write = rs_sta_dbgfs_scale_table_write,
3845         .read = rs_sta_dbgfs_scale_table_read,
3846         .open = simple_open,
3847         .llseek = default_llseek,
3848 };
3849 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3850                         char __user *user_buf, size_t count, loff_t *ppos)
3851 {
3852         char *buff;
3853         int desc = 0;
3854         int i, j;
3855         ssize_t ret;
3856         struct iwl_scale_tbl_info *tbl;
3857         struct rs_rate *rate;
3858         struct iwl_lq_sta *lq_sta = file->private_data;
3859
3860         buff = kmalloc(1024, GFP_KERNEL);
3861         if (!buff)
3862                 return -ENOMEM;
3863
3864         for (i = 0; i < LQ_SIZE; i++) {
3865                 tbl = &(lq_sta->lq_info[i]);
3866                 rate = &tbl->rate;
3867                 desc += sprintf(buff+desc,
3868                                 "%s type=%d SGI=%d BW=%s DUP=0\n"
3869                                 "index=%d\n",
3870                                 lq_sta->active_tbl == i ? "*" : "x",
3871                                 rate->type,
3872                                 rate->sgi,
3873                                 is_ht20(rate) ? "20MHz" :
3874                                 is_ht40(rate) ? "40MHz" :
3875                                 is_ht80(rate) ? "80MHz" :
3876                                 is_ht160(rate) ? "160MHz" : "ERR",
3877                                 rate->index);
3878                 for (j = 0; j < IWL_RATE_COUNT; j++) {
3879                         desc += sprintf(buff+desc,
3880                                 "counter=%d success=%d %%=%d\n",
3881                                 tbl->win[j].counter,
3882                                 tbl->win[j].success_counter,
3883                                 tbl->win[j].success_ratio);
3884                 }
3885         }
3886         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3887         kfree(buff);
3888         return ret;
3889 }
3890
3891 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3892         .read = rs_sta_dbgfs_stats_table_read,
3893         .open = simple_open,
3894         .llseek = default_llseek,
3895 };
3896
3897 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3898                                               char __user *user_buf,
3899                                               size_t count, loff_t *ppos)
3900 {
3901         static const char * const column_name[] = {
3902                 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3903                 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3904                 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3905                 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3906                 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3907                 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3908                 [RS_COLUMN_MIMO2] = "MIMO2",
3909                 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3910         };
3911
3912         static const char * const rate_name[] = {
3913                 [IWL_RATE_1M_INDEX] = "1M",
3914                 [IWL_RATE_2M_INDEX] = "2M",
3915                 [IWL_RATE_5M_INDEX] = "5.5M",
3916                 [IWL_RATE_11M_INDEX] = "11M",
3917                 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3918                 [IWL_RATE_9M_INDEX] = "9M",
3919                 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3920                 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3921                 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3922                 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3923                 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3924                 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3925                 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3926                 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3927                 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3928                 [IWL_RATE_MCS_10_INDEX] = "MCS10",
3929                 [IWL_RATE_MCS_11_INDEX] = "MCS11",
3930         };
3931
3932         char *buff, *pos, *endpos;
3933         int col, rate;
3934         ssize_t ret;
3935         struct iwl_lq_sta *lq_sta = file->private_data;
3936         struct rs_rate_stats *stats;
3937         static const size_t bufsz = 1024;
3938
3939         buff = kmalloc(bufsz, GFP_KERNEL);
3940         if (!buff)
3941                 return -ENOMEM;
3942
3943         pos = buff;
3944         endpos = pos + bufsz;
3945
3946         pos += scnprintf(pos, endpos - pos, "COLUMN,");
3947         for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3948                 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3949         pos += scnprintf(pos, endpos - pos, "\n");
3950
3951         for (col = 0; col < RS_COLUMN_COUNT; col++) {
3952                 pos += scnprintf(pos, endpos - pos,
3953                                  "%s,", column_name[col]);
3954
3955                 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
3956                         stats = &(lq_sta->pers.tx_stats[col][rate]);
3957                         pos += scnprintf(pos, endpos - pos,
3958                                          "%llu/%llu,",
3959                                          stats->success,
3960                                          stats->total);
3961                 }
3962                 pos += scnprintf(pos, endpos - pos, "\n");
3963         }
3964
3965         ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3966         kfree(buff);
3967         return ret;
3968 }
3969
3970 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3971                                                const char __user *user_buf,
3972                                                size_t count, loff_t *ppos)
3973 {
3974         struct iwl_lq_sta *lq_sta = file->private_data;
3975         memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
3976
3977         return count;
3978 }
3979
3980 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
3981         .read = rs_sta_dbgfs_drv_tx_stats_read,
3982         .write = rs_sta_dbgfs_drv_tx_stats_write,
3983         .open = simple_open,
3984         .llseek = default_llseek,
3985 };
3986
3987 static ssize_t iwl_dbgfs_ss_force_read(struct file *file,
3988                                        char __user *user_buf,
3989                                        size_t count, loff_t *ppos)
3990 {
3991         struct iwl_lq_sta *lq_sta = file->private_data;
3992         char buf[12];
3993         int bufsz = sizeof(buf);
3994         int pos = 0;
3995         static const char * const ss_force_name[] = {
3996                 [RS_SS_FORCE_NONE] = "none",
3997                 [RS_SS_FORCE_STBC] = "stbc",
3998                 [RS_SS_FORCE_BFER] = "bfer",
3999                 [RS_SS_FORCE_SISO] = "siso",
4000         };
4001
4002         pos += scnprintf(buf+pos, bufsz-pos, "%s\n",
4003                          ss_force_name[lq_sta->pers.ss_force]);
4004         return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
4005 }
4006
4007 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf,
4008                                         size_t count, loff_t *ppos)
4009 {
4010         struct iwl_mvm *mvm = lq_sta->pers.drv;
4011         int ret = 0;
4012
4013         if (!strncmp("none", buf, 4)) {
4014                 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
4015         } else if (!strncmp("siso", buf, 4)) {
4016                 lq_sta->pers.ss_force = RS_SS_FORCE_SISO;
4017         } else if (!strncmp("stbc", buf, 4)) {
4018                 if (lq_sta->stbc_capable) {
4019                         lq_sta->pers.ss_force = RS_SS_FORCE_STBC;
4020                 } else {
4021                         IWL_ERR(mvm,
4022                                 "can't force STBC. peer doesn't support\n");
4023                         ret = -EINVAL;
4024                 }
4025         } else if (!strncmp("bfer", buf, 4)) {
4026                 if (lq_sta->bfer_capable) {
4027                         lq_sta->pers.ss_force = RS_SS_FORCE_BFER;
4028                 } else {
4029                         IWL_ERR(mvm,
4030                                 "can't force BFER. peer doesn't support\n");
4031                         ret = -EINVAL;
4032                 }
4033         } else {
4034                 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n");
4035                 ret = -EINVAL;
4036         }
4037         return ret ?: count;
4038 }
4039
4040 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
4041         _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta)
4042 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do {                \
4043                 if (!debugfs_create_file(#name, mode, parent, lq_sta,   \
4044                                          &iwl_dbgfs_##name##_ops))      \
4045                         goto err;                                       \
4046         } while (0)
4047
4048 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32);
4049
4050 static void rs_drv_add_sta_debugfs(void *mvm, void *priv_sta,
4051                                    struct dentry *dir)
4052 {
4053         struct iwl_lq_sta *lq_sta = priv_sta;
4054         struct iwl_mvm_sta *mvmsta;
4055
4056         mvmsta = container_of(lq_sta, struct iwl_mvm_sta, lq_sta.rs_drv);
4057
4058         if (!mvmsta->vif)
4059                 return;
4060
4061         debugfs_create_file("rate_scale_table", 0600, dir,
4062                             lq_sta, &rs_sta_dbgfs_scale_table_ops);
4063         debugfs_create_file("rate_stats_table", 0400, dir,
4064                             lq_sta, &rs_sta_dbgfs_stats_table_ops);
4065         debugfs_create_file("drv_tx_stats", 0600, dir,
4066                             lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
4067         debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
4068                           &lq_sta->tx_agg_tid_en);
4069         debugfs_create_u8("reduced_tpc", 0600, dir,
4070                           &lq_sta->pers.dbg_fixed_txp_reduction);
4071
4072         MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, 0600);
4073         return;
4074 err:
4075         IWL_ERR((struct iwl_mvm *)mvm, "Can't create debugfs entity\n");
4076 }
4077
4078 void rs_remove_sta_debugfs(void *mvm, void *mvm_sta)
4079 {
4080 }
4081 #endif
4082
4083 /*
4084  * Initialization of rate scaling information is done by driver after
4085  * the station is added. Since mac80211 calls this function before a
4086  * station is added we ignore it.
4087  */
4088 static void rs_rate_init_ops(void *mvm_r,
4089                              struct ieee80211_supported_band *sband,
4090                              struct cfg80211_chan_def *chandef,
4091                              struct ieee80211_sta *sta, void *mvm_sta)
4092 {
4093 }
4094
4095 /* ops for rate scaling implemented in the driver */
4096 static const struct rate_control_ops rs_mvm_ops_drv = {
4097         .name = RS_NAME,
4098         .tx_status = rs_drv_mac80211_tx_status,
4099         .get_rate = rs_drv_get_rate,
4100         .rate_init = rs_rate_init_ops,
4101         .alloc = rs_alloc,
4102         .free = rs_free,
4103         .alloc_sta = rs_drv_alloc_sta,
4104         .free_sta = rs_free_sta,
4105         .rate_update = rs_drv_rate_update,
4106 #ifdef CONFIG_MAC80211_DEBUGFS
4107         .add_sta_debugfs = rs_drv_add_sta_debugfs,
4108         .remove_sta_debugfs = rs_remove_sta_debugfs,
4109 #endif
4110 };
4111
4112 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
4113                           enum nl80211_band band, bool update)
4114 {
4115         if (iwl_mvm_has_tlc_offload(mvm))
4116                 rs_fw_rate_init(mvm, sta, band, update);
4117         else
4118                 rs_drv_rate_init(mvm, sta, band, update);
4119 }
4120
4121 int iwl_mvm_rate_control_register(void)
4122 {
4123         return ieee80211_rate_control_register(&rs_mvm_ops_drv);
4124 }
4125
4126 void iwl_mvm_rate_control_unregister(void)
4127 {
4128         ieee80211_rate_control_unregister(&rs_mvm_ops_drv);
4129 }
4130
4131 static int rs_drv_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
4132                                 bool enable)
4133 {
4134         struct iwl_lq_cmd *lq = &mvmsta->lq_sta.rs_drv.lq;
4135
4136         lockdep_assert_held(&mvm->mutex);
4137
4138         if (enable) {
4139                 if (mvmsta->tx_protection == 0)
4140                         lq->flags |= LQ_FLAG_USE_RTS_MSK;
4141                 mvmsta->tx_protection++;
4142         } else {
4143                 mvmsta->tx_protection--;
4144                 if (mvmsta->tx_protection == 0)
4145                         lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
4146         }
4147
4148         return iwl_mvm_send_lq_cmd(mvm, lq, false);
4149 }
4150
4151 /**
4152  * iwl_mvm_tx_protection - ask FW to enable RTS/CTS protection
4153  * @mvmsta: The station
4154  * @enable: Enable Tx protection?
4155  */
4156 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
4157                           bool enable)
4158 {
4159         if (iwl_mvm_has_tlc_offload(mvm))
4160                 return rs_fw_tx_protection(mvm, mvmsta, enable);
4161         else
4162                 return rs_drv_tx_protection(mvm, mvmsta, enable);
4163 }