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

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /******************************************************************************
   3  *
   4  * Copyright(c) 2005 - 2014, 2018 - 2022 Intel Corporation. All rights reserved.
   5  * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
   6  * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
   7  *****************************************************************************/
   8 #include <linux/kernel.h>
   9 #include <linux/skbuff.h>
  10 #include <linux/slab.h>
  11 #include <net/mac80211.h>
  12
  13 #include <linux/netdevice.h>
  14 #include <linux/etherdevice.h>
  15 #include <linux/delay.h>
  16
  17 #include <linux/workqueue.h>
  18 #include "rs.h"
  19 #include "fw-api.h"
  20 #include "sta.h"
  21 #include "iwl-op-mode.h"
  22 #include "mvm.h"
  23 #include "debugfs.h"
  24
  25 #define IWL_RATE_MAX_WINDOW             62      /* # tx in history window */
  26
  27 /* Calculations of success ratio are done in fixed point where 12800 is 100%.
  28  * Use this macro when dealing with thresholds consts set as a percentage
  29  */
  30 #define RS_PERCENT(x) (128 * x)
  31
  32 static u8 rs_ht_to_legacy[] = {
  33         [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX,
  34         [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX,
  35         [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX,
  36         [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX,
  37         [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX,
  38         [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX,
  39         [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX,
  40         [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX,
  41         [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX,
  42         [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX,
  43 };
  44
  45 static const u8 ant_toggle_lookup[] = {
  46         [ANT_NONE] = ANT_NONE,
  47         [ANT_A] = ANT_B,
  48         [ANT_B] = ANT_A,
  49         [ANT_AB] = ANT_AB,
  50 };
  51
  52 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn)                           \
  53         [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP,             \
  54                                     IWL_RATE_HT_SISO_MCS_##s##_PLCP,  \
  55                                     IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
  56                                     IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
  57                                     IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\
  58                                     IWL_RATE_##rp##M_INDEX,           \
  59                                     IWL_RATE_##rn##M_INDEX }
  60
  61 #define IWL_DECLARE_MCS_RATE(s)                                           \
  62         [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP,                \
  63                                        IWL_RATE_HT_SISO_MCS_##s##_PLCP,   \
  64                                        IWL_RATE_HT_MIMO2_MCS_##s##_PLCP,  \
  65                                        IWL_RATE_VHT_SISO_MCS_##s##_PLCP,  \
  66                                        IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \
  67                                        IWL_RATE_INVM_INDEX,               \
  68                                        IWL_RATE_INVM_INDEX }
  69
  70 /*
  71  * Parameter order:
  72  *   rate, ht rate, prev rate, next rate
  73  *
  74  * If there isn't a valid next or previous rate then INV is used which
  75  * maps to IWL_RATE_INVALID
  76  *
  77  */
  78 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
  79         IWL_DECLARE_RATE_INFO(1, INV, INV, 2),   /*  1mbps */
  80         IWL_DECLARE_RATE_INFO(2, INV, 1, 5),     /*  2mbps */
  81         IWL_DECLARE_RATE_INFO(5, INV, 2, 11),    /*5.5mbps */
  82         IWL_DECLARE_RATE_INFO(11, INV, 9, 12),   /* 11mbps */
  83         IWL_DECLARE_RATE_INFO(6, 0, 5, 11),      /*  6mbps ; MCS 0 */
  84         IWL_DECLARE_RATE_INFO(9, INV, 6, 11),    /*  9mbps */
  85         IWL_DECLARE_RATE_INFO(12, 1, 11, 18),    /* 12mbps ; MCS 1 */
  86         IWL_DECLARE_RATE_INFO(18, 2, 12, 24),    /* 18mbps ; MCS 2 */
  87         IWL_DECLARE_RATE_INFO(24, 3, 18, 36),    /* 24mbps ; MCS 3 */
  88         IWL_DECLARE_RATE_INFO(36, 4, 24, 48),    /* 36mbps ; MCS 4 */
  89         IWL_DECLARE_RATE_INFO(48, 5, 36, 54),    /* 48mbps ; MCS 5 */
  90         IWL_DECLARE_RATE_INFO(54, 6, 48, INV),   /* 54mbps ; MCS 6 */
  91         IWL_DECLARE_MCS_RATE(7),                 /* MCS 7 */
  92         IWL_DECLARE_MCS_RATE(8),                 /* MCS 8 */
  93         IWL_DECLARE_MCS_RATE(9),                 /* MCS 9 */
  94 };
  95
  96 enum rs_action {
  97         RS_ACTION_STAY = 0,
  98         RS_ACTION_DOWNSCALE = -1,
  99         RS_ACTION_UPSCALE = 1,
 100 };
 101
 102 enum rs_column_mode {
 103         RS_INVALID = 0,
 104         RS_LEGACY,
 105         RS_SISO,
 106         RS_MIMO2,
 107 };
 108
 109 #define MAX_NEXT_COLUMNS 7
 110 #define MAX_COLUMN_CHECKS 3
 111
 112 struct rs_tx_column;
 113
 114 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm,
 115                                      struct ieee80211_sta *sta,
 116                                      struct rs_rate *rate,
 117                                      const struct rs_tx_column *next_col);
 118
 119 struct rs_tx_column {
 120         enum rs_column_mode mode;
 121         u8 ant;
 122         bool sgi;
 123         enum rs_column next_columns[MAX_NEXT_COLUMNS];
 124         allow_column_func_t checks[MAX_COLUMN_CHECKS];
 125 };
 126
 127 static bool rs_ant_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 128                          struct rs_rate *rate,
 129                          const struct rs_tx_column *next_col)
 130 {
 131         return iwl_mvm_bt_coex_is_ant_avail(mvm, next_col->ant);
 132 }
 133
 134 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 135                           struct rs_rate *rate,
 136                           const struct rs_tx_column *next_col)
 137 {
 138         if (!sta->deflink.ht_cap.ht_supported)
 139                 return false;
 140
 141         if (sta->deflink.smps_mode == IEEE80211_SMPS_STATIC)
 142                 return false;
 143
 144         if (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) < 2)
 145                 return false;
 146
 147         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
 148                 return false;
 149
 150         if (mvm->nvm_data->sku_cap_mimo_disabled)
 151                 return false;
 152
 153         return true;
 154 }
 155
 156 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 157                           struct rs_rate *rate,
 158                           const struct rs_tx_column *next_col)
 159 {
 160         if (!sta->deflink.ht_cap.ht_supported)
 161                 return false;
 162
 163         return true;
 164 }
 165
 166 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 167                          struct rs_rate *rate,
 168                          const struct rs_tx_column *next_col)
 169 {
 170         struct ieee80211_sta_ht_cap *ht_cap = &sta->deflink.ht_cap;
 171         struct ieee80211_sta_vht_cap *vht_cap = &sta->deflink.vht_cap;
 172
 173         if (is_ht20(rate) && (ht_cap->cap &
 174                              IEEE80211_HT_CAP_SGI_20))
 175                 return true;
 176         if (is_ht40(rate) && (ht_cap->cap &
 177                              IEEE80211_HT_CAP_SGI_40))
 178                 return true;
 179         if (is_ht80(rate) && (vht_cap->cap &
 180                              IEEE80211_VHT_CAP_SHORT_GI_80))
 181                 return true;
 182         if (is_ht160(rate) && (vht_cap->cap &
 183                              IEEE80211_VHT_CAP_SHORT_GI_160))
 184                 return true;
 185
 186         return false;
 187 }
 188
 189 static const struct rs_tx_column rs_tx_columns[] = {
 190         [RS_COLUMN_LEGACY_ANT_A] = {
 191                 .mode = RS_LEGACY,
 192                 .ant = ANT_A,
 193                 .next_columns = {
 194                         RS_COLUMN_LEGACY_ANT_B,
 195                         RS_COLUMN_SISO_ANT_A,
 196                         RS_COLUMN_MIMO2,
 197                         RS_COLUMN_INVALID,
 198                         RS_COLUMN_INVALID,
 199                         RS_COLUMN_INVALID,
 200                         RS_COLUMN_INVALID,
 201                 },
 202                 .checks = {
 203                         rs_ant_allow,
 204                 },
 205         },
 206         [RS_COLUMN_LEGACY_ANT_B] = {
 207                 .mode = RS_LEGACY,
 208                 .ant = ANT_B,
 209                 .next_columns = {
 210                         RS_COLUMN_LEGACY_ANT_A,
 211                         RS_COLUMN_SISO_ANT_B,
 212                         RS_COLUMN_MIMO2,
 213                         RS_COLUMN_INVALID,
 214                         RS_COLUMN_INVALID,
 215                         RS_COLUMN_INVALID,
 216                         RS_COLUMN_INVALID,
 217                 },
 218                 .checks = {
 219                         rs_ant_allow,
 220                 },
 221         },
 222         [RS_COLUMN_SISO_ANT_A] = {
 223                 .mode = RS_SISO,
 224                 .ant = ANT_A,
 225                 .next_columns = {
 226                         RS_COLUMN_SISO_ANT_B,
 227                         RS_COLUMN_MIMO2,
 228                         RS_COLUMN_SISO_ANT_A_SGI,
 229                         RS_COLUMN_LEGACY_ANT_A,
 230                         RS_COLUMN_LEGACY_ANT_B,
 231                         RS_COLUMN_INVALID,
 232                         RS_COLUMN_INVALID,
 233                 },
 234                 .checks = {
 235                         rs_siso_allow,
 236                         rs_ant_allow,
 237                 },
 238         },
 239         [RS_COLUMN_SISO_ANT_B] = {
 240                 .mode = RS_SISO,
 241                 .ant = ANT_B,
 242                 .next_columns = {
 243                         RS_COLUMN_SISO_ANT_A,
 244                         RS_COLUMN_MIMO2,
 245                         RS_COLUMN_SISO_ANT_B_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_A_SGI] = {
 257                 .mode = RS_SISO,
 258                 .ant = ANT_A,
 259                 .sgi = true,
 260                 .next_columns = {
 261                         RS_COLUMN_SISO_ANT_B_SGI,
 262                         RS_COLUMN_MIMO2_SGI,
 263                         RS_COLUMN_SISO_ANT_A,
 264                         RS_COLUMN_LEGACY_ANT_A,
 265                         RS_COLUMN_LEGACY_ANT_B,
 266                         RS_COLUMN_INVALID,
 267                         RS_COLUMN_INVALID,
 268                 },
 269                 .checks = {
 270                         rs_siso_allow,
 271                         rs_ant_allow,
 272                         rs_sgi_allow,
 273                 },
 274         },
 275         [RS_COLUMN_SISO_ANT_B_SGI] = {
 276                 .mode = RS_SISO,
 277                 .ant = ANT_B,
 278                 .sgi = true,
 279                 .next_columns = {
 280                         RS_COLUMN_SISO_ANT_A_SGI,
 281                         RS_COLUMN_MIMO2_SGI,
 282                         RS_COLUMN_SISO_ANT_B,
 283                         RS_COLUMN_LEGACY_ANT_A,
 284                         RS_COLUMN_LEGACY_ANT_B,
 285                         RS_COLUMN_INVALID,
 286                         RS_COLUMN_INVALID,
 287                 },
 288                 .checks = {
 289                         rs_siso_allow,
 290                         rs_ant_allow,
 291                         rs_sgi_allow,
 292                 },
 293         },
 294         [RS_COLUMN_MIMO2] = {
 295                 .mode = RS_MIMO2,
 296                 .ant = ANT_AB,
 297                 .next_columns = {
 298                         RS_COLUMN_SISO_ANT_A,
 299                         RS_COLUMN_MIMO2_SGI,
 300                         RS_COLUMN_LEGACY_ANT_A,
 301                         RS_COLUMN_LEGACY_ANT_B,
 302                         RS_COLUMN_INVALID,
 303                         RS_COLUMN_INVALID,
 304                         RS_COLUMN_INVALID,
 305                 },
 306                 .checks = {
 307                         rs_mimo_allow,
 308                 },
 309         },
 310         [RS_COLUMN_MIMO2_SGI] = {
 311                 .mode = RS_MIMO2,
 312                 .ant = ANT_AB,
 313                 .sgi = true,
 314                 .next_columns = {
 315                         RS_COLUMN_SISO_ANT_A_SGI,
 316                         RS_COLUMN_MIMO2,
 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                         rs_sgi_allow,
 326                 },
 327         },
 328 };
 329
 330 static inline u8 rs_extract_rate(u32 rate_n_flags)
 331 {
 332         /* also works for HT because bits 7:6 are zero there */
 333         return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK_V1);
 334 }
 335
 336 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
 337 {
 338         int idx = 0;
 339
 340         if (rate_n_flags & RATE_MCS_HT_MSK_V1) {
 341                 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK_V1;
 342                 idx += IWL_RATE_MCS_0_INDEX;
 343
 344                 /* skip 9M not supported in HT*/
 345                 if (idx >= IWL_RATE_9M_INDEX)
 346                         idx += 1;
 347                 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
 348                         return idx;
 349         } else if (rate_n_flags & RATE_MCS_VHT_MSK_V1 ||
 350                    rate_n_flags & RATE_MCS_HE_MSK_V1) {
 351                 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
 352                 idx += IWL_RATE_MCS_0_INDEX;
 353
 354                 /* skip 9M not supported in VHT*/
 355                 if (idx >= IWL_RATE_9M_INDEX)
 356                         idx++;
 357                 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
 358                         return idx;
 359                 if ((rate_n_flags & RATE_MCS_HE_MSK_V1) &&
 360                     idx <= IWL_LAST_HE_RATE)
 361                         return idx;
 362         } else {
 363                 /* legacy rate format, search for match in table */
 364
 365                 u8 legacy_rate = rs_extract_rate(rate_n_flags);
 366                 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
 367                         if (iwl_rates[idx].plcp == legacy_rate)
 368                                 return idx;
 369         }
 370
 371         return IWL_RATE_INVALID;
 372 }
 373
 374 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
 375                                   struct ieee80211_sta *sta,
 376                                   struct iwl_lq_sta *lq_sta,
 377                                   int tid, bool ndp);
 378 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
 379                            struct ieee80211_sta *sta,
 380                            struct iwl_lq_sta *lq_sta,
 381                            const struct rs_rate *initial_rate);
 382 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
 383
 384 /*
 385  * The following tables contain the expected throughput metrics for all rates
 386  *
 387  *      1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 388  *
 389  * where invalid entries are zeros.
 390  *
 391  * CCK rates are only valid in legacy table and will only be used in G
 392  * (2.4 GHz) band.
 393  */
 394 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
 395         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
 396 };
 397
 398 /* Expected TpT tables. 4 indexes:
 399  * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
 400  */
 401 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
 402         {0, 0, 0, 0, 42, 0,  76, 102, 124, 159, 183, 193, 202, 216, 0},
 403         {0, 0, 0, 0, 46, 0,  82, 110, 132, 168, 192, 202, 210, 225, 0},
 404         {0, 0, 0, 0, 49, 0,  97, 145, 192, 285, 375, 420, 464, 551, 0},
 405         {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
 406 };
 407
 408 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
 409         {0, 0, 0, 0,  77, 0, 127, 160, 184, 220, 242, 250,  257,  269,  275},
 410         {0, 0, 0, 0,  83, 0, 135, 169, 193, 229, 250, 257,  264,  275,  280},
 411         {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828,  911, 1070, 1173},
 412         {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
 413 };
 414
 415 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
 416         {0, 0, 0, 0, 130, 0, 191, 223, 244,  273,  288,  294,  298,  305,  308},
 417         {0, 0, 0, 0, 138, 0, 200, 231, 251,  279,  293,  298,  302,  308,  312},
 418         {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
 419         {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
 420 };
 421
 422 static const u16 expected_tpt_siso_160MHz[4][IWL_RATE_COUNT] = {
 423         {0, 0, 0, 0, 191, 0, 244, 288,  298,  308,  313,  318,  323,  328,  330},
 424         {0, 0, 0, 0, 200, 0, 251, 293,  302,  312,  317,  322,  327,  332,  334},
 425         {0, 0, 0, 0, 439, 0, 875, 1307, 1736, 2584, 3419, 3831, 4240, 5049, 5581},
 426         {0, 0, 0, 0, 488, 0, 972, 1451, 1925, 2864, 3785, 4240, 4691, 5581, 6165},
 427 };
 428
 429 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
 430         {0, 0, 0, 0,  74, 0, 123, 155, 179, 213, 235, 243, 250,  261, 0},
 431         {0, 0, 0, 0,  81, 0, 131, 164, 187, 221, 242, 250, 256,  267, 0},
 432         {0, 0, 0, 0,  98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
 433         {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
 434 };
 435
 436 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
 437         {0, 0, 0, 0, 123, 0, 182, 214, 235,  264,  279,  285,  289,  296,  300},
 438         {0, 0, 0, 0, 131, 0, 191, 222, 242,  270,  284,  289,  293,  300,  303},
 439         {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
 440         {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
 441 };
 442
 443 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
 444         {0, 0, 0, 0, 182, 0, 240,  264,  278,  299,  308,  311,  313,  317,  319},
 445         {0, 0, 0, 0, 190, 0, 247,  269,  282,  302,  310,  313,  315,  319,  320},
 446         {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
 447         {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
 448 };
 449
 450 static const u16 expected_tpt_mimo2_160MHz[4][IWL_RATE_COUNT] = {
 451         {0, 0, 0, 0, 240, 0, 278,  308,  313,  319,  322,  324,  328,  330,   334},
 452         {0, 0, 0, 0, 247, 0, 282,  310,  315,  320,  323,  325,  329,  332,   338},
 453         {0, 0, 0, 0, 875, 0, 1735, 2582, 3414, 5043, 6619, 7389, 8147, 9629,  10592},
 454         {0, 0, 0, 0, 971, 0, 1925, 2861, 3779, 5574, 7304, 8147, 8976, 10592, 11640},
 455 };
 456
 457 static const char *rs_pretty_lq_type(enum iwl_table_type type)
 458 {
 459         static const char * const lq_types[] = {
 460                 [LQ_NONE] = "NONE",
 461                 [LQ_LEGACY_A] = "LEGACY_A",
 462                 [LQ_LEGACY_G] = "LEGACY_G",
 463                 [LQ_HT_SISO] = "HT SISO",
 464                 [LQ_HT_MIMO2] = "HT MIMO",
 465                 [LQ_VHT_SISO] = "VHT SISO",
 466                 [LQ_VHT_MIMO2] = "VHT MIMO",
 467                 [LQ_HE_SISO] = "HE SISO",
 468                 [LQ_HE_MIMO2] = "HE MIMO",
 469         };
 470
 471         if (type < LQ_NONE || type >= LQ_MAX)
 472                 return "UNKNOWN";
 473
 474         return lq_types[type];
 475 }
 476
 477 static char *rs_pretty_rate(const struct rs_rate *rate)
 478 {
 479         static char buf[40];
 480         static const char * const legacy_rates[] = {
 481                 [IWL_RATE_1M_INDEX] = "1M",
 482                 [IWL_RATE_2M_INDEX] = "2M",
 483                 [IWL_RATE_5M_INDEX] = "5.5M",
 484                 [IWL_RATE_11M_INDEX] = "11M",
 485                 [IWL_RATE_6M_INDEX] = "6M",
 486                 [IWL_RATE_9M_INDEX] = "9M",
 487                 [IWL_RATE_12M_INDEX] = "12M",
 488                 [IWL_RATE_18M_INDEX] = "18M",
 489                 [IWL_RATE_24M_INDEX] = "24M",
 490                 [IWL_RATE_36M_INDEX] = "36M",
 491                 [IWL_RATE_48M_INDEX] = "48M",
 492                 [IWL_RATE_54M_INDEX] = "54M",
 493         };
 494         static const char *const ht_vht_rates[] = {
 495                 [IWL_RATE_MCS_0_INDEX] = "MCS0",
 496                 [IWL_RATE_MCS_1_INDEX] = "MCS1",
 497                 [IWL_RATE_MCS_2_INDEX] = "MCS2",
 498                 [IWL_RATE_MCS_3_INDEX] = "MCS3",
 499                 [IWL_RATE_MCS_4_INDEX] = "MCS4",
 500                 [IWL_RATE_MCS_5_INDEX] = "MCS5",
 501                 [IWL_RATE_MCS_6_INDEX] = "MCS6",
 502                 [IWL_RATE_MCS_7_INDEX] = "MCS7",
 503                 [IWL_RATE_MCS_8_INDEX] = "MCS8",
 504                 [IWL_RATE_MCS_9_INDEX] = "MCS9",
 505         };
 506         const char *rate_str;
 507
 508         if (is_type_legacy(rate->type) && (rate->index <= IWL_RATE_54M_INDEX))
 509                 rate_str = legacy_rates[rate->index];
 510         else if ((is_type_ht(rate->type) || is_type_vht(rate->type)) &&
 511                  (rate->index >= IWL_RATE_MCS_0_INDEX) &&
 512                  (rate->index <= IWL_RATE_MCS_9_INDEX))
 513                 rate_str = ht_vht_rates[rate->index];
 514         else
 515                 rate_str = NULL;
 516
 517         sprintf(buf, "(%s|%s|%s)", rs_pretty_lq_type(rate->type),
 518                 iwl_rs_pretty_ant(rate->ant), rate_str ?: "BAD_RATE");
 519         return buf;
 520 }
 521
 522 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
 523                                 const char *prefix)
 524 {
 525         IWL_DEBUG_RATE(mvm,
 526                        "%s: %s BW: %d SGI: %d LDPC: %d STBC: %d\n",
 527                        prefix, rs_pretty_rate(rate), rate->bw,
 528                        rate->sgi, rate->ldpc, rate->stbc);
 529 }
 530
 531 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
 532 {
 533         window->data = 0;
 534         window->success_counter = 0;
 535         window->success_ratio = IWL_INVALID_VALUE;
 536         window->counter = 0;
 537         window->average_tpt = IWL_INVALID_VALUE;
 538 }
 539
 540 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
 541                                             struct iwl_scale_tbl_info *tbl)
 542 {
 543         int i;
 544
 545         IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
 546         for (i = 0; i < IWL_RATE_COUNT; i++)
 547                 rs_rate_scale_clear_window(&tbl->win[i]);
 548
 549         for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
 550                 rs_rate_scale_clear_window(&tbl->tpc_win[i]);
 551 }
 552
 553 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 554 {
 555         return (ant_type & valid_antenna) == ant_type;
 556 }
 557
 558 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
 559                                      struct iwl_lq_sta *lq_data, u8 tid,
 560                                      struct ieee80211_sta *sta)
 561 {
 562         int ret;
 563
 564         IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
 565                      sta->addr, tid);
 566
 567         /* start BA session until the peer sends del BA */
 568         ret = ieee80211_start_tx_ba_session(sta, tid, 0);
 569         if (ret == -EAGAIN) {
 570                 /*
 571                  * driver and mac80211 is out of sync
 572                  * this might be cause by reloading firmware
 573                  * stop the tx ba session here
 574                  */
 575                 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
 576                         tid);
 577                 ieee80211_stop_tx_ba_session(sta, tid);
 578         }
 579         return ret;
 580 }
 581
 582 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
 583                               u8 tid, struct iwl_lq_sta *lq_sta,
 584                               struct ieee80211_sta *sta)
 585 {
 586         struct iwl_mvm_tid_data *tid_data;
 587
 588         /*
 589          * In AP mode, tid can be equal to IWL_MAX_TID_COUNT
 590          * when the frame is not QoS
 591          */
 592         if (WARN_ON_ONCE(tid > IWL_MAX_TID_COUNT)) {
 593                 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
 594                         tid, IWL_MAX_TID_COUNT);
 595                 return;
 596         } else if (tid == IWL_MAX_TID_COUNT) {
 597                 return;
 598         }
 599
 600         tid_data = &mvmsta->tid_data[tid];
 601         if (mvmsta->sta_state >= IEEE80211_STA_AUTHORIZED &&
 602             tid_data->state == IWL_AGG_OFF &&
 603             (lq_sta->tx_agg_tid_en & BIT(tid)) &&
 604             tid_data->tx_count_last >= IWL_MVM_RS_AGG_START_THRESHOLD) {
 605                 IWL_DEBUG_RATE(mvm, "try to aggregate tid %d\n", tid);
 606                 if (rs_tl_turn_on_agg_for_tid(mvm, lq_sta, tid, sta) == 0)
 607                         tid_data->state = IWL_AGG_QUEUED;
 608         }
 609 }
 610
 611 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
 612 {
 613         return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 614                !!(rate_n_flags & RATE_MCS_ANT_B_MSK);
 615 }
 616
 617 /*
 618  * Static function to get the expected throughput from an iwl_scale_tbl_info
 619  * that wraps a NULL pointer check
 620  */
 621 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
 622 {
 623         if (tbl->expected_tpt)
 624                 return tbl->expected_tpt[rs_index];
 625         return 0;
 626 }
 627
 628 /*
 629  * rs_collect_tx_data - Update the success/failure sliding window
 630  *
 631  * We keep a sliding window of the last 62 packets transmitted
 632  * at this rate.  window->data contains the bitmask of successful
 633  * packets.
 634  */
 635 static int _rs_collect_tx_data(struct iwl_mvm *mvm,
 636                                struct iwl_scale_tbl_info *tbl,
 637                                int scale_index, int attempts, int successes,
 638                                struct iwl_rate_scale_data *window)
 639 {
 640         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
 641         s32 fail_count, tpt;
 642
 643         /* Get expected throughput */
 644         tpt = get_expected_tpt(tbl, scale_index);
 645
 646         /*
 647          * Keep track of only the latest 62 tx frame attempts in this rate's
 648          * history window; anything older isn't really relevant any more.
 649          * If we have filled up the sliding window, drop the oldest attempt;
 650          * if the oldest attempt (highest bit in bitmap) shows "success",
 651          * subtract "1" from the success counter (this is the main reason
 652          * we keep these bitmaps!).
 653          */
 654         while (attempts > 0) {
 655                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
 656                         /* remove earliest */
 657                         window->counter = IWL_RATE_MAX_WINDOW - 1;
 658
 659                         if (window->data & mask) {
 660                                 window->data &= ~mask;
 661                                 window->success_counter--;
 662                         }
 663                 }
 664
 665                 /* Increment frames-attempted counter */
 666                 window->counter++;
 667
 668                 /* Shift bitmap by one frame to throw away oldest history */
 669                 window->data <<= 1;
 670
 671                 /* Mark the most recent #successes attempts as successful */
 672                 if (successes > 0) {
 673                         window->success_counter++;
 674                         window->data |= 0x1;
 675                         successes--;
 676                 }
 677
 678                 attempts--;
 679         }
 680
 681         /* Calculate current success ratio, avoid divide-by-0! */
 682         if (window->counter > 0)
 683                 window->success_ratio = 128 * (100 * window->success_counter)
 684                                         / window->counter;
 685         else
 686                 window->success_ratio = IWL_INVALID_VALUE;
 687
 688         fail_count = window->counter - window->success_counter;
 689
 690         /* Calculate average throughput, if we have enough history. */
 691         if ((fail_count >= IWL_MVM_RS_RATE_MIN_FAILURE_TH) ||
 692             (window->success_counter >= IWL_MVM_RS_RATE_MIN_SUCCESS_TH))
 693                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 694         else
 695                 window->average_tpt = IWL_INVALID_VALUE;
 696
 697         return 0;
 698 }
 699
 700 static int rs_collect_tpc_data(struct iwl_mvm *mvm,
 701                                struct iwl_lq_sta *lq_sta,
 702                                struct iwl_scale_tbl_info *tbl,
 703                                int scale_index, int attempts, int successes,
 704                                u8 reduced_txp)
 705 {
 706         struct iwl_rate_scale_data *window = NULL;
 707
 708         if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
 709                 return -EINVAL;
 710
 711         window = &tbl->tpc_win[reduced_txp];
 712         return  _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
 713                                     window);
 714 }
 715
 716 static void rs_update_tid_tpt_stats(struct iwl_mvm *mvm,
 717                                     struct iwl_mvm_sta *mvmsta,
 718                                     u8 tid, int successes)
 719 {
 720         struct iwl_mvm_tid_data *tid_data;
 721
 722         if (tid >= IWL_MAX_TID_COUNT)
 723                 return;
 724
 725         tid_data = &mvmsta->tid_data[tid];
 726
 727         /*
 728          * Measure if there're enough successful transmits per second.
 729          * These statistics are used only to decide if we can start a
 730          * BA session, so it should be updated only when A-MPDU is
 731          * off.
 732          */
 733         if (tid_data->state != IWL_AGG_OFF)
 734                 return;
 735
 736         if (time_is_before_jiffies(tid_data->tpt_meas_start + HZ) ||
 737             (tid_data->tx_count >= IWL_MVM_RS_AGG_START_THRESHOLD)) {
 738                 tid_data->tx_count_last = tid_data->tx_count;
 739                 tid_data->tx_count = 0;
 740                 tid_data->tpt_meas_start = jiffies;
 741         } else {
 742                 tid_data->tx_count += successes;
 743         }
 744 }
 745
 746 static int rs_collect_tlc_data(struct iwl_mvm *mvm,
 747                                struct iwl_mvm_sta *mvmsta, u8 tid,
 748                                struct iwl_scale_tbl_info *tbl,
 749                                int scale_index, int attempts, int successes)
 750 {
 751         struct iwl_rate_scale_data *window = NULL;
 752
 753         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 754                 return -EINVAL;
 755
 756         if (tbl->column != RS_COLUMN_INVALID) {
 757                 struct lq_sta_pers *pers = &mvmsta->deflink.lq_sta.rs_drv.pers;
 758
 759                 pers->tx_stats[tbl->column][scale_index].total += attempts;
 760                 pers->tx_stats[tbl->column][scale_index].success += successes;
 761         }
 762
 763         rs_update_tid_tpt_stats(mvm, mvmsta, tid, successes);
 764
 765         /* Select window for current tx bit rate */
 766         window = &(tbl->win[scale_index]);
 767         return _rs_collect_tx_data(mvm, tbl, scale_index, attempts, successes,
 768                                    window);
 769 }
 770
 771 /* Convert rs_rate object into ucode rate bitmask */
 772 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
 773                                   struct rs_rate *rate)
 774 {
 775         u32 ucode_rate = 0;
 776         int index = rate->index;
 777
 778         ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
 779                          RATE_MCS_ANT_AB_MSK);
 780
 781         if (is_legacy(rate)) {
 782                 ucode_rate |= iwl_rates[index].plcp;
 783                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 784                         ucode_rate |= RATE_MCS_CCK_MSK_V1;
 785                 return ucode_rate;
 786         }
 787
 788         /* set RTS protection for all non legacy rates
 789          * This helps with congested environments reducing the conflict cost to
 790          * RTS retries only, instead of the entire BA packet.
 791          */
 792         ucode_rate |= RATE_MCS_RTS_REQUIRED_MSK;
 793
 794         if (is_ht(rate)) {
 795                 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
 796                         IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
 797                         index = IWL_LAST_HT_RATE;
 798                 }
 799                 ucode_rate |= RATE_MCS_HT_MSK_V1;
 800
 801                 if (is_ht_siso(rate))
 802                         ucode_rate |= iwl_rates[index].plcp_ht_siso;
 803                 else if (is_ht_mimo2(rate))
 804                         ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
 805                 else
 806                         WARN_ON_ONCE(1);
 807         } else if (is_vht(rate)) {
 808                 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
 809                         IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
 810                         index = IWL_LAST_VHT_RATE;
 811                 }
 812                 ucode_rate |= RATE_MCS_VHT_MSK_V1;
 813                 if (is_vht_siso(rate))
 814                         ucode_rate |= iwl_rates[index].plcp_vht_siso;
 815                 else if (is_vht_mimo2(rate))
 816                         ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
 817                 else
 818                         WARN_ON_ONCE(1);
 819
 820         } else {
 821                 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
 822         }
 823
 824         if (is_siso(rate) && rate->stbc) {
 825                 /* To enable STBC we need to set both a flag and ANT_AB */
 826                 ucode_rate |= RATE_MCS_ANT_AB_MSK;
 827                 ucode_rate |= RATE_MCS_STBC_MSK;
 828         }
 829
 830         ucode_rate |= rate->bw;
 831         if (rate->sgi)
 832                 ucode_rate |= RATE_MCS_SGI_MSK_V1;
 833         if (rate->ldpc)
 834                 ucode_rate |= RATE_MCS_LDPC_MSK_V1;
 835
 836         return ucode_rate;
 837 }
 838
 839 /* Convert a ucode rate into an rs_rate object */
 840 static int rs_rate_from_ucode_rate(const u32 ucode_rate,
 841                                    enum nl80211_band band,
 842                                    struct rs_rate *rate)
 843 {
 844         u32 ant_msk = ucode_rate & RATE_MCS_ANT_AB_MSK;
 845         u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
 846         u8 nss;
 847
 848         memset(rate, 0, sizeof(*rate));
 849         rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
 850
 851         if (rate->index == IWL_RATE_INVALID)
 852                 return -EINVAL;
 853
 854         rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
 855
 856         /* Legacy */
 857         if (!(ucode_rate & RATE_MCS_HT_MSK_V1) &&
 858             !(ucode_rate & RATE_MCS_VHT_MSK_V1) &&
 859             !(ucode_rate & RATE_MCS_HE_MSK_V1)) {
 860                 if (num_of_ant == 1) {
 861                         if (band == NL80211_BAND_5GHZ)
 862                                 rate->type = LQ_LEGACY_A;
 863                         else
 864                                 rate->type = LQ_LEGACY_G;
 865                 }
 866
 867                 return 0;
 868         }
 869
 870         /* HT, VHT or HE */
 871         if (ucode_rate & RATE_MCS_SGI_MSK_V1)
 872                 rate->sgi = true;
 873         if (ucode_rate & RATE_MCS_LDPC_MSK_V1)
 874                 rate->ldpc = true;
 875         if (ucode_rate & RATE_MCS_STBC_MSK)
 876                 rate->stbc = true;
 877         if (ucode_rate & RATE_MCS_BF_MSK)
 878                 rate->bfer = true;
 879
 880         rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK_V1;
 881
 882         if (ucode_rate & RATE_MCS_HT_MSK_V1) {
 883                 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK_V1) >>
 884                        RATE_HT_MCS_NSS_POS_V1) + 1;
 885
 886                 if (nss == 1) {
 887                         rate->type = LQ_HT_SISO;
 888                         WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
 889                                   "stbc %d bfer %d",
 890                                   rate->stbc, rate->bfer);
 891                 } else if (nss == 2) {
 892                         rate->type = LQ_HT_MIMO2;
 893                         WARN_ON_ONCE(num_of_ant != 2);
 894                 } else {
 895                         WARN_ON_ONCE(1);
 896                 }
 897         } else if (ucode_rate & RATE_MCS_VHT_MSK_V1) {
 898                 nss = FIELD_GET(RATE_MCS_NSS_MSK, ucode_rate) + 1;
 899
 900                 if (nss == 1) {
 901                         rate->type = LQ_VHT_SISO;
 902                         WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
 903                                   "stbc %d bfer %d",
 904                                   rate->stbc, rate->bfer);
 905                 } else if (nss == 2) {
 906                         rate->type = LQ_VHT_MIMO2;
 907                         WARN_ON_ONCE(num_of_ant != 2);
 908                 } else {
 909                         WARN_ON_ONCE(1);
 910                 }
 911         } else if (ucode_rate & RATE_MCS_HE_MSK_V1) {
 912                 nss = FIELD_GET(RATE_MCS_NSS_MSK, ucode_rate) + 1;
 913
 914                 if (nss == 1) {
 915                         rate->type = LQ_HE_SISO;
 916                         WARN_ONCE(!rate->stbc && !rate->bfer && num_of_ant != 1,
 917                                   "stbc %d bfer %d", rate->stbc, rate->bfer);
 918                 } else if (nss == 2) {
 919                         rate->type = LQ_HE_MIMO2;
 920                         WARN_ON_ONCE(num_of_ant != 2);
 921                 } else {
 922                         WARN_ON_ONCE(1);
 923                 }
 924         }
 925
 926         WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
 927                      !is_he(rate) && !is_vht(rate));
 928
 929         return 0;
 930 }
 931
 932 /* switch to another antenna/antennas and return 1 */
 933 /* if no other valid antenna found, return 0 */
 934 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
 935 {
 936         u8 new_ant_type;
 937
 938         if (!rs_is_valid_ant(valid_ant, rate->ant))
 939                 return 0;
 940
 941         new_ant_type = ant_toggle_lookup[rate->ant];
 942
 943         while ((new_ant_type != rate->ant) &&
 944                !rs_is_valid_ant(valid_ant, new_ant_type))
 945                 new_ant_type = ant_toggle_lookup[new_ant_type];
 946
 947         if (new_ant_type == rate->ant)
 948                 return 0;
 949
 950         rate->ant = new_ant_type;
 951
 952         return 1;
 953 }
 954
 955 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
 956                                   struct rs_rate *rate)
 957 {
 958         if (is_legacy(rate))
 959                 return lq_sta->active_legacy_rate;
 960         else if (is_siso(rate))
 961                 return lq_sta->active_siso_rate;
 962         else if (is_mimo2(rate))
 963                 return lq_sta->active_mimo2_rate;
 964
 965         WARN_ON_ONCE(1);
 966         return 0;
 967 }
 968
 969 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
 970                                 int rate_type)
 971 {
 972         u8 high = IWL_RATE_INVALID;
 973         u8 low = IWL_RATE_INVALID;
 974
 975         /* 802.11A or ht walks to the next literal adjacent rate in
 976          * the rate table */
 977         if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
 978                 int i;
 979                 u32 mask;
 980
 981                 /* Find the previous rate that is in the rate mask */
 982                 i = index - 1;
 983                 if (i >= 0)
 984                         mask = BIT(i);
 985                 for (; i >= 0; i--, mask >>= 1) {
 986                         if (rate_mask & mask) {
 987                                 low = i;
 988                                 break;
 989                         }
 990                 }
 991
 992                 /* Find the next rate that is in the rate mask */
 993                 i = index + 1;
 994                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 995                         if (rate_mask & mask) {
 996                                 high = i;
 997                                 break;
 998                         }
 999                 }
1000
1001                 return (high << 8) | low;
1002         }
1003
1004         low = index;
1005         while (low != IWL_RATE_INVALID) {
1006                 low = iwl_rates[low].prev_rs;
1007                 if (low == IWL_RATE_INVALID)
1008                         break;
1009                 if (rate_mask & (1 << low))
1010                         break;
1011         }
1012
1013         high = index;
1014         while (high != IWL_RATE_INVALID) {
1015                 high = iwl_rates[high].next_rs;
1016                 if (high == IWL_RATE_INVALID)
1017                         break;
1018                 if (rate_mask & (1 << high))
1019                         break;
1020         }
1021
1022         return (high << 8) | low;
1023 }
1024
1025 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
1026                                      struct rs_rate *rate)
1027 {
1028         return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
1029 }
1030
1031 /* Get the next supported lower rate in the current column.
1032  * Return true if bottom rate in the current column was reached
1033  */
1034 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
1035                                         struct rs_rate *rate)
1036 {
1037         u8 low;
1038         u16 high_low;
1039         u16 rate_mask;
1040         struct iwl_mvm *mvm = lq_sta->pers.drv;
1041
1042         rate_mask = rs_get_supported_rates(lq_sta, rate);
1043         high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
1044                                         rate->type);
1045         low = high_low & 0xff;
1046
1047         /* Bottom rate of column reached */
1048         if (low == IWL_RATE_INVALID)
1049                 return true;
1050
1051         rate->index = low;
1052         return false;
1053 }
1054
1055 /* Get the next rate to use following a column downgrade */
1056 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
1057                                           struct rs_rate *rate)
1058 {
1059         struct iwl_mvm *mvm = lq_sta->pers.drv;
1060
1061         if (is_legacy(rate)) {
1062                 /* No column to downgrade from Legacy */
1063                 return;
1064         } else if (is_siso(rate)) {
1065                 /* Downgrade to Legacy if we were in SISO */
1066                 if (lq_sta->band == NL80211_BAND_5GHZ)
1067                         rate->type = LQ_LEGACY_A;
1068                 else
1069                         rate->type = LQ_LEGACY_G;
1070
1071                 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1072
1073                 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
1074                              rate->index > IWL_RATE_MCS_9_INDEX);
1075
1076                 rate->index = rs_ht_to_legacy[rate->index];
1077                 rate->ldpc = false;
1078         } else {
1079                 /* Downgrade to SISO with same MCS if in MIMO  */
1080                 rate->type = is_vht_mimo2(rate) ?
1081                         LQ_VHT_SISO : LQ_HT_SISO;
1082         }
1083
1084         if (num_of_ant(rate->ant) > 1)
1085                 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
1086
1087         /* Relevant in both switching to SISO or Legacy */
1088         rate->sgi = false;
1089
1090         if (!rs_rate_supported(lq_sta, rate))
1091                 rs_get_lower_rate_in_column(lq_sta, rate);
1092 }
1093
1094 /* Check if both rates share the same column */
1095 static inline bool rs_rate_column_match(struct rs_rate *a,
1096                                         struct rs_rate *b)
1097 {
1098         bool ant_match;
1099
1100         if (a->stbc || a->bfer)
1101                 ant_match = (b->ant == ANT_A || b->ant == ANT_B);
1102         else
1103                 ant_match = (a->ant == b->ant);
1104
1105         return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi)
1106                 && ant_match;
1107 }
1108
1109 static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate)
1110 {
1111         if (is_legacy(rate)) {
1112                 if (rate->ant == ANT_A)
1113                         return RS_COLUMN_LEGACY_ANT_A;
1114
1115                 if (rate->ant == ANT_B)
1116                         return RS_COLUMN_LEGACY_ANT_B;
1117
1118                 goto err;
1119         }
1120
1121         if (is_siso(rate)) {
1122                 if (rate->ant == ANT_A || rate->stbc || rate->bfer)
1123                         return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI :
1124                                 RS_COLUMN_SISO_ANT_A;
1125
1126                 if (rate->ant == ANT_B)
1127                         return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI :
1128                                 RS_COLUMN_SISO_ANT_B;
1129
1130                 goto err;
1131         }
1132
1133         if (is_mimo(rate))
1134                 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2;
1135
1136 err:
1137         return RS_COLUMN_INVALID;
1138 }
1139
1140 static u8 rs_get_tid(struct ieee80211_hdr *hdr)
1141 {
1142         u8 tid = IWL_MAX_TID_COUNT;
1143
1144         if (ieee80211_is_data_qos(hdr->frame_control)) {
1145                 u8 *qc = ieee80211_get_qos_ctl(hdr);
1146                 tid = qc[0] & 0xf;
1147         }
1148
1149         if (unlikely(tid > IWL_MAX_TID_COUNT))
1150                 tid = IWL_MAX_TID_COUNT;
1151
1152         return tid;
1153 }
1154
1155 /*
1156  * mac80211 sends us Tx status
1157  */
1158 static void rs_drv_mac80211_tx_status(void *mvm_r,
1159                                       struct ieee80211_supported_band *sband,
1160                                       struct ieee80211_sta *sta, void *priv_sta,
1161                                       struct sk_buff *skb)
1162 {
1163         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1164         struct iwl_op_mode *op_mode = mvm_r;
1165         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1166         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1167         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1168
1169         if (!mvmsta->vif)
1170                 return;
1171
1172         if (!ieee80211_is_data(hdr->frame_control) ||
1173             info->flags & IEEE80211_TX_CTL_NO_ACK)
1174                 return;
1175
1176         iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info,
1177                              ieee80211_is_qos_nullfunc(hdr->frame_control));
1178 }
1179
1180 /*
1181  * Begin a period of staying with a selected modulation mode.
1182  * Set "stay_in_tbl" flag to prevent any mode switches.
1183  * Set frame tx success limits according to legacy vs. high-throughput,
1184  * and reset overall (spanning all rates) tx success history statistics.
1185  * These control how long we stay using same modulation mode before
1186  * searching for a new mode.
1187  */
1188 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1189                                  struct iwl_lq_sta *lq_sta)
1190 {
1191         IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1192         lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1193         if (is_legacy) {
1194                 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT;
1195                 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT;
1196                 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT;
1197         } else {
1198                 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT;
1199                 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT;
1200                 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT;
1201         }
1202         lq_sta->table_count = 0;
1203         lq_sta->total_failed = 0;
1204         lq_sta->total_success = 0;
1205         lq_sta->flush_timer = jiffies;
1206         lq_sta->visited_columns = 0;
1207 }
1208
1209 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask)
1210 {
1211         if (rate_mask)
1212                 return find_last_bit(&rate_mask, BITS_PER_LONG);
1213         return IWL_RATE_INVALID;
1214 }
1215
1216 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1217                                    const struct rs_tx_column *column)
1218 {
1219         switch (column->mode) {
1220         case RS_LEGACY:
1221                 return lq_sta->max_legacy_rate_idx;
1222         case RS_SISO:
1223                 return lq_sta->max_siso_rate_idx;
1224         case RS_MIMO2:
1225                 return lq_sta->max_mimo2_rate_idx;
1226         default:
1227                 WARN_ON_ONCE(1);
1228         }
1229
1230         return lq_sta->max_legacy_rate_idx;
1231 }
1232
1233 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1234                                             const struct rs_tx_column *column,
1235                                             u32 bw)
1236 {
1237         /* Used to choose among HT tables */
1238         const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1239
1240         if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1241                          column->mode != RS_SISO &&
1242                          column->mode != RS_MIMO2))
1243                 return expected_tpt_legacy;
1244
1245         /* Legacy rates have only one table */
1246         if (column->mode == RS_LEGACY)
1247                 return expected_tpt_legacy;
1248
1249         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1250         /* Choose among many HT tables depending on number of streams
1251          * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1252          * status */
1253         if (column->mode == RS_SISO) {
1254                 switch (bw) {
1255                 case RATE_MCS_CHAN_WIDTH_20:
1256                         ht_tbl_pointer = expected_tpt_siso_20MHz;
1257                         break;
1258                 case RATE_MCS_CHAN_WIDTH_40:
1259                         ht_tbl_pointer = expected_tpt_siso_40MHz;
1260                         break;
1261                 case RATE_MCS_CHAN_WIDTH_80:
1262                         ht_tbl_pointer = expected_tpt_siso_80MHz;
1263                         break;
1264                 case RATE_MCS_CHAN_WIDTH_160:
1265                         ht_tbl_pointer = expected_tpt_siso_160MHz;
1266                         break;
1267                 default:
1268                         WARN_ON_ONCE(1);
1269                 }
1270         } else if (column->mode == RS_MIMO2) {
1271                 switch (bw) {
1272                 case RATE_MCS_CHAN_WIDTH_20:
1273                         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1274                         break;
1275                 case RATE_MCS_CHAN_WIDTH_40:
1276                         ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1277                         break;
1278                 case RATE_MCS_CHAN_WIDTH_80:
1279                         ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1280                         break;
1281                 case RATE_MCS_CHAN_WIDTH_160:
1282                         ht_tbl_pointer = expected_tpt_mimo2_160MHz;
1283                         break;
1284                 default:
1285                         WARN_ON_ONCE(1);
1286                 }
1287         } else {
1288                 WARN_ON_ONCE(1);
1289         }
1290
1291         if (!column->sgi && !lq_sta->is_agg)            /* Normal */
1292                 return ht_tbl_pointer[0];
1293         else if (column->sgi && !lq_sta->is_agg)        /* SGI */
1294                 return ht_tbl_pointer[1];
1295         else if (!column->sgi && lq_sta->is_agg)        /* AGG */
1296                 return ht_tbl_pointer[2];
1297         else                                            /* AGG+SGI */
1298                 return ht_tbl_pointer[3];
1299 }
1300
1301 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1302                                       struct iwl_scale_tbl_info *tbl)
1303 {
1304         struct rs_rate *rate = &tbl->rate;
1305         const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1306
1307         tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1308 }
1309
1310 /* rs uses two tables, one is active and the second is for searching better
1311  * configuration. This function, according to the index of the currently
1312  * active table returns the search table, which is located at the
1313  * index complementary to 1 according to the active table (active = 1,
1314  * search = 0 or active = 0, search = 1).
1315  * Since lq_info is an arary of size 2, make sure index cannot be out of bounds.
1316  */
1317 static inline u8 rs_search_tbl(u8 active_tbl)
1318 {
1319         return (active_tbl ^ 1) & 1;
1320 }
1321
1322 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1323                             struct iwl_lq_sta *lq_sta,
1324                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1325                             unsigned long rate_mask, s8 index)
1326 {
1327         struct iwl_scale_tbl_info *active_tbl =
1328             &(lq_sta->lq_info[lq_sta->active_tbl]);
1329         s32 success_ratio = active_tbl->win[index].success_ratio;
1330         u16 expected_current_tpt = active_tbl->expected_tpt[index];
1331         const u16 *tpt_tbl = tbl->expected_tpt;
1332         u16 high_low;
1333         u32 target_tpt;
1334         int rate_idx;
1335
1336         if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1337                 target_tpt = 100 * expected_current_tpt;
1338                 IWL_DEBUG_RATE(mvm,
1339                                "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1340                                success_ratio, target_tpt);
1341         } else {
1342                 target_tpt = lq_sta->last_tpt;
1343                 IWL_DEBUG_RATE(mvm,
1344                                "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n",
1345                                success_ratio, target_tpt);
1346         }
1347
1348         rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
1349
1350         while (rate_idx != IWL_RATE_INVALID) {
1351                 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1352                         break;
1353
1354                 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1355                                                 tbl->rate.type);
1356
1357                 rate_idx = (high_low >> 8) & 0xff;
1358         }
1359
1360         IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1361                        rate_idx, target_tpt,
1362                        rate_idx != IWL_RATE_INVALID ?
1363                        100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1364
1365         return rate_idx;
1366 }
1367
1368 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1369 {
1370         struct ieee80211_sta_vht_cap *sta_vht_cap = &sta->deflink.vht_cap;
1371         struct ieee80211_vht_cap vht_cap = {
1372                 .vht_cap_info = cpu_to_le32(sta_vht_cap->cap),
1373                 .supp_mcs = sta_vht_cap->vht_mcs,
1374         };
1375
1376         switch (sta->deflink.bandwidth) {
1377         case IEEE80211_STA_RX_BW_160:
1378                 /*
1379                  * Don't use 160 MHz if VHT extended NSS support
1380                  * says we cannot use 2 streams, we don't want to
1381                  * deal with this.
1382                  * We only check MCS 0 - they will support that if
1383                  * we got here at all and we don't care which MCS,
1384                  * we want to determine a more global state.
1385                  */
1386                 if (ieee80211_get_vht_max_nss(&vht_cap,
1387                                               IEEE80211_VHT_CHANWIDTH_160MHZ,
1388                                               0, true,
1389                                               sta->deflink.rx_nss) < sta->deflink.rx_nss)
1390                         return RATE_MCS_CHAN_WIDTH_80;
1391                 return RATE_MCS_CHAN_WIDTH_160;
1392         case IEEE80211_STA_RX_BW_80:
1393                 return RATE_MCS_CHAN_WIDTH_80;
1394         case IEEE80211_STA_RX_BW_40:
1395                 return RATE_MCS_CHAN_WIDTH_40;
1396         case IEEE80211_STA_RX_BW_20:
1397         default:
1398                 return RATE_MCS_CHAN_WIDTH_20;
1399         }
1400 }
1401
1402 /*
1403  * Check whether we should continue using same modulation mode, or
1404  * begin search for a new mode, based on:
1405  * 1) # tx successes or failures while using this mode
1406  * 2) # times calling this function
1407  * 3) elapsed time in this mode (not used, for now)
1408  */
1409 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1410 {
1411         struct iwl_scale_tbl_info *tbl;
1412         int active_tbl;
1413         int flush_interval_passed = 0;
1414         struct iwl_mvm *mvm;
1415
1416         mvm = lq_sta->pers.drv;
1417         active_tbl = lq_sta->active_tbl;
1418
1419         tbl = &(lq_sta->lq_info[active_tbl]);
1420
1421         /* If we've been disallowing search, see if we should now allow it */
1422         if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1423                 /* Elapsed time using current modulation mode */
1424                 if (lq_sta->flush_timer)
1425                         flush_interval_passed =
1426                                 time_after(jiffies,
1427                                            (unsigned long)(lq_sta->flush_timer +
1428                                                            (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
1429
1430                 /*
1431                  * Check if we should allow search for new modulation mode.
1432                  * If many frames have failed or succeeded, or we've used
1433                  * this same modulation for a long time, allow search, and
1434                  * reset history stats that keep track of whether we should
1435                  * allow a new search.  Also (below) reset all bitmaps and
1436                  * stats in active history.
1437                  */
1438                 if (force_search ||
1439                     (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1440                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1441                     ((!lq_sta->search_better_tbl) &&
1442                      (lq_sta->flush_timer) && (flush_interval_passed))) {
1443                         IWL_DEBUG_RATE(mvm,
1444                                        "LQ: stay is expired %d %d %d\n",
1445                                      lq_sta->total_failed,
1446                                      lq_sta->total_success,
1447                                      flush_interval_passed);
1448
1449                         /* Allow search for new mode */
1450                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1451                         IWL_DEBUG_RATE(mvm,
1452                                        "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1453                         lq_sta->total_failed = 0;
1454                         lq_sta->total_success = 0;
1455                         lq_sta->flush_timer = 0;
1456                         /* mark the current column as visited */
1457                         lq_sta->visited_columns = BIT(tbl->column);
1458                 /*
1459                  * Else if we've used this modulation mode enough repetitions
1460                  * (regardless of elapsed time or success/failure), reset
1461                  * history bitmaps and rate-specific stats for all rates in
1462                  * active table.
1463                  */
1464                 } else {
1465                         lq_sta->table_count++;
1466                         if (lq_sta->table_count >=
1467                             lq_sta->table_count_limit) {
1468                                 lq_sta->table_count = 0;
1469
1470                                 IWL_DEBUG_RATE(mvm,
1471                                                "LQ: stay in table clear win\n");
1472                                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1473                         }
1474                 }
1475
1476                 /* If transitioning to allow "search", reset all history
1477                  * bitmaps and stats in active table (this will become the new
1478                  * "search" table). */
1479                 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1480                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
1481                 }
1482         }
1483 }
1484
1485 static void rs_set_amsdu_len(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1486                              struct iwl_scale_tbl_info *tbl,
1487                              enum rs_action scale_action)
1488 {
1489         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1490         struct ieee80211_bss_conf *bss_conf = &mvmsta->vif->bss_conf;
1491         int i;
1492
1493         sta->deflink.agg.max_amsdu_len =
1494                 rs_fw_get_max_amsdu_len(sta, bss_conf, &sta->deflink);
1495
1496         /*
1497          * In case TLC offload is not active amsdu_enabled is either 0xFFFF
1498          * or 0, since there is no per-TID alg.
1499          */
1500         if ((!is_vht(&tbl->rate) && !is_ht(&tbl->rate)) ||
1501             tbl->rate.index < IWL_RATE_MCS_5_INDEX ||
1502             scale_action == RS_ACTION_DOWNSCALE)
1503                 mvmsta->amsdu_enabled = 0;
1504         else
1505                 mvmsta->amsdu_enabled = 0xFFFF;
1506
1507         if (bss_conf->he_support &&
1508             !iwlwifi_mod_params.disable_11ax)
1509                 mvmsta->max_amsdu_len = sta->deflink.agg.max_amsdu_len;
1510         else
1511                 mvmsta->max_amsdu_len =
1512                         min_t(int, sta->deflink.agg.max_amsdu_len, 8500);
1513
1514         sta->deflink.agg.max_rc_amsdu_len = mvmsta->max_amsdu_len;
1515
1516         for (i = 0; i < IWL_MAX_TID_COUNT; i++) {
1517                 if (mvmsta->amsdu_enabled)
1518                         sta->deflink.agg.max_tid_amsdu_len[i] =
1519                                 iwl_mvm_max_amsdu_size(mvm, sta, i);
1520                 else
1521                         /*
1522                          * Not so elegant, but this will effectively
1523                          * prevent AMSDU on this TID
1524                          */
1525                         sta->deflink.agg.max_tid_amsdu_len[i] = 1;
1526         }
1527 }
1528
1529 /*
1530  * setup rate table in uCode
1531  */
1532 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1533                                struct ieee80211_sta *sta,
1534                                struct iwl_lq_sta *lq_sta,
1535                                struct iwl_scale_tbl_info *tbl)
1536 {
1537         rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
1538         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq);
1539 }
1540
1541 static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm,
1542                               struct ieee80211_sta *sta,
1543                               struct iwl_lq_sta *lq_sta,
1544                               struct iwl_scale_tbl_info *tbl,
1545                               enum rs_action scale_action)
1546 {
1547         if (rs_bw_from_sta_bw(sta) != RATE_MCS_CHAN_WIDTH_80)
1548                 return false;
1549
1550         if (!is_vht_siso(&tbl->rate))
1551                 return false;
1552
1553         if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) &&
1554             (tbl->rate.index == IWL_RATE_MCS_0_INDEX) &&
1555             (scale_action == RS_ACTION_DOWNSCALE)) {
1556                 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20;
1557                 tbl->rate.index = IWL_RATE_MCS_4_INDEX;
1558                 IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n");
1559                 goto tweaked;
1560         }
1561
1562         /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is
1563          * sustainable, i.e. we're past the test window. We can't go back
1564          * if MCS5 is just tested as this will happen always after switching
1565          * to 20Mhz MCS4 because the rate stats are cleared.
1566          */
1567         if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) &&
1568             (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) &&
1569              (scale_action == RS_ACTION_STAY)) ||
1570              ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) &&
1571               (scale_action == RS_ACTION_UPSCALE)))) {
1572                 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80;
1573                 tbl->rate.index = IWL_RATE_MCS_1_INDEX;
1574                 IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n");
1575                 goto tweaked;
1576         }
1577
1578         return false;
1579
1580 tweaked:
1581         rs_set_expected_tpt_table(lq_sta, tbl);
1582         rs_rate_scale_clear_tbl_windows(mvm, tbl);
1583         return true;
1584 }
1585
1586 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1587                                          struct iwl_lq_sta *lq_sta,
1588                                          struct ieee80211_sta *sta,
1589                                          struct iwl_scale_tbl_info *tbl)
1590 {
1591         int i, j, max_rate;
1592         enum rs_column next_col_id;
1593         const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1594         const struct rs_tx_column *next_col;
1595         allow_column_func_t allow_func;
1596         u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
1597         const u16 *expected_tpt_tbl;
1598         u16 tpt, max_expected_tpt;
1599
1600         for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1601                 next_col_id = curr_col->next_columns[i];
1602
1603                 if (next_col_id == RS_COLUMN_INVALID)
1604                         continue;
1605
1606                 if (lq_sta->visited_columns & BIT(next_col_id)) {
1607                         IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1608                                        next_col_id);
1609                         continue;
1610                 }
1611
1612                 next_col = &rs_tx_columns[next_col_id];
1613
1614                 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1615                         IWL_DEBUG_RATE(mvm,
1616                                        "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1617                                        next_col_id, valid_ants, next_col->ant);
1618                         continue;
1619                 }
1620
1621                 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1622                         allow_func = next_col->checks[j];
1623                         if (allow_func && !allow_func(mvm, sta, &tbl->rate,
1624                                                       next_col))
1625                                 break;
1626                 }
1627
1628                 if (j != MAX_COLUMN_CHECKS) {
1629                         IWL_DEBUG_RATE(mvm,
1630                                        "Skip column %d: not allowed (check %d failed)\n",
1631                                        next_col_id, j);
1632
1633                         continue;
1634                 }
1635
1636                 tpt = lq_sta->last_tpt / 100;
1637                 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1638                                                      rs_bw_from_sta_bw(sta));
1639                 if (WARN_ON_ONCE(!expected_tpt_tbl))
1640                         continue;
1641
1642                 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1643                 if (max_rate == IWL_RATE_INVALID) {
1644                         IWL_DEBUG_RATE(mvm,
1645                                        "Skip column %d: no rate is allowed in this column\n",
1646                                        next_col_id);
1647                         continue;
1648                 }
1649
1650                 max_expected_tpt = expected_tpt_tbl[max_rate];
1651                 if (tpt >= max_expected_tpt) {
1652                         IWL_DEBUG_RATE(mvm,
1653                                        "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1654                                        next_col_id, max_expected_tpt, tpt);
1655                         continue;
1656                 }
1657
1658                 IWL_DEBUG_RATE(mvm,
1659                                "Found potential column %d. Max expected %d current %d\n",
1660                                next_col_id, max_expected_tpt, tpt);
1661                 break;
1662         }
1663
1664         if (i == MAX_NEXT_COLUMNS)
1665                 return RS_COLUMN_INVALID;
1666
1667         return next_col_id;
1668 }
1669
1670 static int rs_switch_to_column(struct iwl_mvm *mvm,
1671                                struct iwl_lq_sta *lq_sta,
1672                                struct ieee80211_sta *sta,
1673                                enum rs_column col_id)
1674 {
1675         struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
1676         struct iwl_scale_tbl_info *search_tbl =
1677                 &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
1678         struct rs_rate *rate = &search_tbl->rate;
1679         const struct rs_tx_column *column = &rs_tx_columns[col_id];
1680         const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1681         unsigned long rate_mask = 0;
1682         u32 rate_idx = 0;
1683
1684         memcpy(search_tbl, tbl, offsetof(struct iwl_scale_tbl_info, win));
1685
1686         rate->sgi = column->sgi;
1687         rate->ant = column->ant;
1688
1689         if (column->mode == RS_LEGACY) {
1690                 if (lq_sta->band == NL80211_BAND_5GHZ)
1691                         rate->type = LQ_LEGACY_A;
1692                 else
1693                         rate->type = LQ_LEGACY_G;
1694
1695                 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1696                 rate->ldpc = false;
1697                 rate_mask = lq_sta->active_legacy_rate;
1698         } else if (column->mode == RS_SISO) {
1699                 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1700                 rate_mask = lq_sta->active_siso_rate;
1701         } else if (column->mode == RS_MIMO2) {
1702                 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1703                 rate_mask = lq_sta->active_mimo2_rate;
1704         } else {
1705                 WARN_ONCE(1, "Bad column mode");
1706         }
1707
1708         if (column->mode != RS_LEGACY) {
1709                 rate->bw = rs_bw_from_sta_bw(sta);
1710                 rate->ldpc = lq_sta->ldpc;
1711         }
1712
1713         search_tbl->column = col_id;
1714         rs_set_expected_tpt_table(lq_sta, search_tbl);
1715
1716         lq_sta->visited_columns |= BIT(col_id);
1717
1718         /* Get the best matching rate if we're changing modes. e.g.
1719          * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1720          */
1721         if (curr_column->mode != column->mode) {
1722                 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1723                                             rate_mask, rate->index);
1724
1725                 if ((rate_idx == IWL_RATE_INVALID) ||
1726                     !(BIT(rate_idx) & rate_mask)) {
1727                         IWL_DEBUG_RATE(mvm,
1728                                        "can not switch with index %d"
1729                                        " rate mask %lx\n",
1730                                        rate_idx, rate_mask);
1731
1732                         goto err;
1733                 }
1734
1735                 rate->index = rate_idx;
1736         }
1737
1738         IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1739                        col_id, rate->index);
1740
1741         return 0;
1742
1743 err:
1744         rate->type = LQ_NONE;
1745         return -1;
1746 }
1747
1748 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1749                                          struct iwl_scale_tbl_info *tbl,
1750                                          s32 sr, int low, int high,
1751                                          int current_tpt,
1752                                          int low_tpt, int high_tpt)
1753 {
1754         enum rs_action action = RS_ACTION_STAY;
1755
1756         if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
1757             (current_tpt == 0)) {
1758                 IWL_DEBUG_RATE(mvm,
1759                                "Decrease rate because of low SR\n");
1760                 return RS_ACTION_DOWNSCALE;
1761         }
1762
1763         if ((low_tpt == IWL_INVALID_VALUE) &&
1764             (high_tpt == IWL_INVALID_VALUE) &&
1765             (high != IWL_RATE_INVALID)) {
1766                 IWL_DEBUG_RATE(mvm,
1767                                "No data about high/low rates. Increase rate\n");
1768                 return RS_ACTION_UPSCALE;
1769         }
1770
1771         if ((high_tpt == IWL_INVALID_VALUE) &&
1772             (high != IWL_RATE_INVALID) &&
1773             (low_tpt != IWL_INVALID_VALUE) &&
1774             (low_tpt < current_tpt)) {
1775                 IWL_DEBUG_RATE(mvm,
1776                                "No data about high rate and low rate is worse. Increase rate\n");
1777                 return RS_ACTION_UPSCALE;
1778         }
1779
1780         if ((high_tpt != IWL_INVALID_VALUE) &&
1781             (high_tpt > current_tpt)) {
1782                 IWL_DEBUG_RATE(mvm,
1783                                "Higher rate is better. Increate rate\n");
1784                 return RS_ACTION_UPSCALE;
1785         }
1786
1787         if ((low_tpt != IWL_INVALID_VALUE) &&
1788             (high_tpt != IWL_INVALID_VALUE) &&
1789             (low_tpt < current_tpt) &&
1790             (high_tpt < current_tpt)) {
1791                 IWL_DEBUG_RATE(mvm,
1792                                "Both high and low are worse. Maintain rate\n");
1793                 return RS_ACTION_STAY;
1794         }
1795
1796         if ((low_tpt != IWL_INVALID_VALUE) &&
1797             (low_tpt > current_tpt)) {
1798                 IWL_DEBUG_RATE(mvm,
1799                                "Lower rate is better\n");
1800                 action = RS_ACTION_DOWNSCALE;
1801                 goto out;
1802         }
1803
1804         if ((low_tpt == IWL_INVALID_VALUE) &&
1805             (low != IWL_RATE_INVALID)) {
1806                 IWL_DEBUG_RATE(mvm,
1807                                "No data about lower rate\n");
1808                 action = RS_ACTION_DOWNSCALE;
1809                 goto out;
1810         }
1811
1812         IWL_DEBUG_RATE(mvm, "Maintain rate\n");
1813
1814 out:
1815         if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
1816                 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1817                         IWL_DEBUG_RATE(mvm,
1818                                        "SR is above NO DECREASE. Avoid downscale\n");
1819                         action = RS_ACTION_STAY;
1820                 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
1821                         IWL_DEBUG_RATE(mvm,
1822                                        "Current TPT is higher than max expected in low rate. Avoid downscale\n");
1823                         action = RS_ACTION_STAY;
1824                 } else {
1825                         IWL_DEBUG_RATE(mvm, "Decrease rate\n");
1826                 }
1827         }
1828
1829         return action;
1830 }
1831
1832 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1833                           struct iwl_lq_sta *lq_sta)
1834 {
1835         /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
1836          * supports STBC of at least 1*SS
1837          */
1838         if (!lq_sta->stbc_capable)
1839                 return false;
1840
1841         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
1842                 return false;
1843
1844         return true;
1845 }
1846
1847 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
1848                                 int *weaker, int *stronger)
1849 {
1850         *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
1851         if (*weaker > TPC_MAX_REDUCTION)
1852                 *weaker = TPC_INVALID;
1853
1854         *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
1855         if (*stronger < 0)
1856                 *stronger = TPC_INVALID;
1857 }
1858
1859 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1860                            struct rs_rate *rate, enum nl80211_band band)
1861 {
1862         int index = rate->index;
1863         bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
1864         bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
1865                                 !vif->cfg.ps);
1866
1867         IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
1868                        cam, sta_ps_disabled);
1869         /*
1870          * allow tpc only if power management is enabled, or bt coex
1871          * activity grade allows it and we are on 2.4Ghz.
1872          */
1873         if ((cam || sta_ps_disabled) &&
1874             !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
1875                 return false;
1876
1877         IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
1878         if (is_legacy(rate))
1879                 return index == IWL_RATE_54M_INDEX;
1880         if (is_ht(rate))
1881                 return index == IWL_RATE_MCS_7_INDEX;
1882         if (is_vht(rate))
1883                 return index == IWL_RATE_MCS_9_INDEX;
1884
1885         WARN_ON_ONCE(1);
1886         return false;
1887 }
1888
1889 enum tpc_action {
1890         TPC_ACTION_STAY,
1891         TPC_ACTION_DECREASE,
1892         TPC_ACTION_INCREASE,
1893         TPC_ACTION_NO_RESTIRCTION,
1894 };
1895
1896 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
1897                                          s32 sr, int weak, int strong,
1898                                          int current_tpt,
1899                                          int weak_tpt, int strong_tpt)
1900 {
1901         /* stay until we have valid tpt */
1902         if (current_tpt == IWL_INVALID_VALUE) {
1903                 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
1904                 return TPC_ACTION_STAY;
1905         }
1906
1907         /* Too many failures, increase txp */
1908         if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
1909             current_tpt == 0) {
1910                 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
1911                 return TPC_ACTION_NO_RESTIRCTION;
1912         }
1913
1914         /* try decreasing first if applicable */
1915         if (sr >= RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
1916             weak != TPC_INVALID) {
1917                 if (weak_tpt == IWL_INVALID_VALUE &&
1918                     (strong_tpt == IWL_INVALID_VALUE ||
1919                      current_tpt >= strong_tpt)) {
1920                         IWL_DEBUG_RATE(mvm,
1921                                        "no weak txp measurement. decrease txp\n");
1922                         return TPC_ACTION_DECREASE;
1923                 }
1924
1925                 if (weak_tpt > current_tpt) {
1926                         IWL_DEBUG_RATE(mvm,
1927                                        "lower txp has better tpt. decrease txp\n");
1928                         return TPC_ACTION_DECREASE;
1929                 }
1930         }
1931
1932         /* next, increase if needed */
1933         if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
1934             strong != TPC_INVALID) {
1935                 if (weak_tpt == IWL_INVALID_VALUE &&
1936                     strong_tpt != IWL_INVALID_VALUE &&
1937                     current_tpt < strong_tpt) {
1938                         IWL_DEBUG_RATE(mvm,
1939                                        "higher txp has better tpt. increase txp\n");
1940                         return TPC_ACTION_INCREASE;
1941                 }
1942
1943                 if (weak_tpt < current_tpt &&
1944                     (strong_tpt == IWL_INVALID_VALUE ||
1945                      strong_tpt > current_tpt)) {
1946                         IWL_DEBUG_RATE(mvm,
1947                                        "lower txp has worse tpt. increase txp\n");
1948                         return TPC_ACTION_INCREASE;
1949                 }
1950         }
1951
1952         IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
1953         return TPC_ACTION_STAY;
1954 }
1955
1956 static bool rs_tpc_perform(struct iwl_mvm *mvm,
1957                            struct ieee80211_sta *sta,
1958                            struct iwl_lq_sta *lq_sta,
1959                            struct iwl_scale_tbl_info *tbl)
1960 {
1961         struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
1962         struct ieee80211_vif *vif = mvm_sta->vif;
1963         struct ieee80211_chanctx_conf *chanctx_conf;
1964         enum nl80211_band band;
1965         struct iwl_rate_scale_data *window;
1966         struct rs_rate *rate = &tbl->rate;
1967         enum tpc_action action;
1968         s32 sr;
1969         u8 cur = lq_sta->lq.reduced_tpc;
1970         int current_tpt;
1971         int weak, strong;
1972         int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
1973
1974 #ifdef CONFIG_MAC80211_DEBUGFS
1975         if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
1976                 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
1977                                lq_sta->pers.dbg_fixed_txp_reduction);
1978                 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
1979                 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
1980         }
1981 #endif
1982
1983         rcu_read_lock();
1984         chanctx_conf = rcu_dereference(vif->bss_conf.chanctx_conf);
1985         if (WARN_ON(!chanctx_conf))
1986                 band = NUM_NL80211_BANDS;
1987         else
1988                 band = chanctx_conf->def.chan->band;
1989         rcu_read_unlock();
1990
1991         if (!rs_tpc_allowed(mvm, vif, rate, band)) {
1992                 IWL_DEBUG_RATE(mvm,
1993                                "tpc is not allowed. remove txp restrictions\n");
1994                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
1995                 return cur != TPC_NO_REDUCTION;
1996         }
1997
1998         rs_get_adjacent_txp(mvm, cur, &weak, &strong);
1999
2000         /* Collect measured throughputs for current and adjacent rates */
2001         window = tbl->tpc_win;
2002         sr = window[cur].success_ratio;
2003         current_tpt = window[cur].average_tpt;
2004         if (weak != TPC_INVALID)
2005                 weak_tpt = window[weak].average_tpt;
2006         if (strong != TPC_INVALID)
2007                 strong_tpt = window[strong].average_tpt;
2008
2009         IWL_DEBUG_RATE(mvm,
2010                        "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
2011                        cur, current_tpt, sr, weak, strong,
2012                        weak_tpt, strong_tpt);
2013
2014         action = rs_get_tpc_action(mvm, sr, weak, strong,
2015                                    current_tpt, weak_tpt, strong_tpt);
2016
2017         /* override actions if we are on the edge */
2018         if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
2019                 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
2020                 action = TPC_ACTION_STAY;
2021         } else if (strong == TPC_INVALID &&
2022                    (action == TPC_ACTION_INCREASE ||
2023                     action == TPC_ACTION_NO_RESTIRCTION)) {
2024                 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2025                 action = TPC_ACTION_STAY;
2026         }
2027
2028         switch (action) {
2029         case TPC_ACTION_DECREASE:
2030                 lq_sta->lq.reduced_tpc = weak;
2031                 return true;
2032         case TPC_ACTION_INCREASE:
2033                 lq_sta->lq.reduced_tpc = strong;
2034                 return true;
2035         case TPC_ACTION_NO_RESTIRCTION:
2036                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2037                 return true;
2038         case TPC_ACTION_STAY:
2039                 /* do nothing */
2040                 break;
2041         }
2042         return false;
2043 }
2044
2045 /*
2046  * Do rate scaling and search for new modulation mode.
2047  */
2048 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2049                                   struct ieee80211_sta *sta,
2050                                   struct iwl_lq_sta *lq_sta,
2051                                   int tid, bool ndp)
2052 {
2053         int low = IWL_RATE_INVALID;
2054         int high = IWL_RATE_INVALID;
2055         int index;
2056         struct iwl_rate_scale_data *window = NULL;
2057         int current_tpt = IWL_INVALID_VALUE;
2058         int low_tpt = IWL_INVALID_VALUE;
2059         int high_tpt = IWL_INVALID_VALUE;
2060         u32 fail_count;
2061         enum rs_action scale_action = RS_ACTION_STAY;
2062         u16 rate_mask;
2063         u8 update_lq = 0;
2064         struct iwl_scale_tbl_info *tbl, *tbl1;
2065         u8 active_tbl = 0;
2066         u8 done_search = 0;
2067         u16 high_low;
2068         s32 sr;
2069         u8 prev_agg = lq_sta->is_agg;
2070         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2071         struct rs_rate *rate;
2072
2073         lq_sta->is_agg = !!mvmsta->agg_tids;
2074
2075         /*
2076          * Select rate-scale / modulation-mode table to work with in
2077          * the rest of this function:  "search" if searching for better
2078          * modulation mode, or "active" if doing rate scaling within a mode.
2079          */
2080         if (!lq_sta->search_better_tbl)
2081                 active_tbl = lq_sta->active_tbl;
2082         else
2083                 active_tbl = rs_search_tbl(lq_sta->active_tbl);
2084
2085         tbl = &(lq_sta->lq_info[active_tbl]);
2086         rate = &tbl->rate;
2087
2088         if (prev_agg != lq_sta->is_agg) {
2089                 IWL_DEBUG_RATE(mvm,
2090                                "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2091                                prev_agg, lq_sta->is_agg);
2092                 rs_set_expected_tpt_table(lq_sta, tbl);
2093                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2094         }
2095
2096         /* current tx rate */
2097         index = rate->index;
2098
2099         /* rates available for this association, and for modulation mode */
2100         rate_mask = rs_get_supported_rates(lq_sta, rate);
2101
2102         if (!(BIT(index) & rate_mask)) {
2103                 IWL_ERR(mvm, "Current Rate is not valid\n");
2104                 if (lq_sta->search_better_tbl) {
2105                         /* revert to active table if search table is not valid*/
2106                         rate->type = LQ_NONE;
2107                         lq_sta->search_better_tbl = 0;
2108                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2109                         rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2110                 }
2111                 return;
2112         }
2113
2114         /* Get expected throughput table and history window for current rate */
2115         if (!tbl->expected_tpt) {
2116                 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2117                 return;
2118         }
2119
2120         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2121         window = &(tbl->win[index]);
2122
2123         /*
2124          * If there is not enough history to calculate actual average
2125          * throughput, keep analyzing results of more tx frames, without
2126          * changing rate or mode (bypass most of the rest of this function).
2127          * Set up new rate table in uCode only if old rate is not supported
2128          * in current association (use new rate found above).
2129          */
2130         fail_count = window->counter - window->success_counter;
2131         if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2132             (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
2133                 IWL_DEBUG_RATE(mvm,
2134                                "%s: Test Window: succ %d total %d\n",
2135                                rs_pretty_rate(rate),
2136                                window->success_counter, window->counter);
2137
2138                 /* Can't calculate this yet; not enough history */
2139                 window->average_tpt = IWL_INVALID_VALUE;
2140
2141                 /* Should we stay with this modulation mode,
2142                  * or search for a new one? */
2143                 rs_stay_in_table(lq_sta, false);
2144
2145                 return;
2146         }
2147
2148         /* If we are searching for better modulation mode, check success. */
2149         if (lq_sta->search_better_tbl) {
2150                 /* If good success, continue using the "search" mode;
2151                  * no need to send new link quality command, since we're
2152                  * continuing to use the setup that we've been trying. */
2153                 if (window->average_tpt > lq_sta->last_tpt) {
2154                         IWL_DEBUG_RATE(mvm,
2155                                        "SWITCHING TO NEW TABLE SR: %d "
2156                                        "cur-tpt %d old-tpt %d\n",
2157                                        window->success_ratio,
2158                                        window->average_tpt,
2159                                        lq_sta->last_tpt);
2160
2161                         /* Swap tables; "search" becomes "active" */
2162                         lq_sta->active_tbl = active_tbl;
2163                         current_tpt = window->average_tpt;
2164                 /* Else poor success; go back to mode in "active" table */
2165                 } else {
2166                         IWL_DEBUG_RATE(mvm,
2167                                        "GOING BACK TO THE OLD TABLE: SR %d "
2168                                        "cur-tpt %d old-tpt %d\n",
2169                                        window->success_ratio,
2170                                        window->average_tpt,
2171                                        lq_sta->last_tpt);
2172
2173                         /* Nullify "search" table */
2174                         rate->type = LQ_NONE;
2175
2176                         /* Revert to "active" table */
2177                         active_tbl = lq_sta->active_tbl;
2178                         tbl = &(lq_sta->lq_info[active_tbl]);
2179
2180                         /* Revert to "active" rate and throughput info */
2181                         index = tbl->rate.index;
2182                         current_tpt = lq_sta->last_tpt;
2183
2184                         /* Need to set up a new rate table in uCode */
2185                         update_lq = 1;
2186                 }
2187
2188                 /* Either way, we've made a decision; modulation mode
2189                  * search is done, allow rate adjustment next time. */
2190                 lq_sta->search_better_tbl = 0;
2191                 done_search = 1;        /* Don't switch modes below! */
2192                 goto lq_update;
2193         }
2194
2195         /* (Else) not in search of better modulation mode, try for better
2196          * starting rate, while staying in this mode. */
2197         high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2198         low = high_low & 0xff;
2199         high = (high_low >> 8) & 0xff;
2200
2201         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2202
2203         sr = window->success_ratio;
2204
2205         /* Collect measured throughputs for current and adjacent rates */
2206         current_tpt = window->average_tpt;
2207         if (low != IWL_RATE_INVALID)
2208                 low_tpt = tbl->win[low].average_tpt;
2209         if (high != IWL_RATE_INVALID)
2210                 high_tpt = tbl->win[high].average_tpt;
2211
2212         IWL_DEBUG_RATE(mvm,
2213                        "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2214                        rs_pretty_rate(rate), current_tpt, sr,
2215                        low, high, low_tpt, high_tpt);
2216
2217         scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2218                                           current_tpt, low_tpt, high_tpt);
2219
2220         /* Force a search in case BT doesn't like us being in MIMO */
2221         if (is_mimo(rate) &&
2222             !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2223                 IWL_DEBUG_RATE(mvm,
2224                                "BT Coex forbids MIMO. Search for new config\n");
2225                 rs_stay_in_table(lq_sta, true);
2226                 goto lq_update;
2227         }
2228
2229         switch (scale_action) {
2230         case RS_ACTION_DOWNSCALE:
2231                 /* Decrease starting rate, update uCode's rate table */
2232                 if (low != IWL_RATE_INVALID) {
2233                         update_lq = 1;
2234                         index = low;
2235                 } else {
2236                         IWL_DEBUG_RATE(mvm,
2237                                        "At the bottom rate. Can't decrease\n");
2238                 }
2239
2240                 break;
2241         case RS_ACTION_UPSCALE:
2242                 /* Increase starting rate, update uCode's rate table */
2243                 if (high != IWL_RATE_INVALID) {
2244                         update_lq = 1;
2245                         index = high;
2246                 } else {
2247                         IWL_DEBUG_RATE(mvm,
2248                                        "At the top rate. Can't increase\n");
2249                 }
2250
2251                 break;
2252         case RS_ACTION_STAY:
2253                 /* No change */
2254                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2255                         update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2256                 break;
2257         default:
2258                 break;
2259         }
2260
2261 lq_update:
2262         /* Replace uCode's rate table for the destination station. */
2263         if (update_lq) {
2264                 tbl->rate.index = index;
2265                 if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK)
2266                         rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action);
2267                 rs_set_amsdu_len(mvm, sta, tbl, scale_action);
2268                 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2269         }
2270
2271         rs_stay_in_table(lq_sta, false);
2272
2273         /*
2274          * Search for new modulation mode if we're:
2275          * 1)  Not changing rates right now
2276          * 2)  Not just finishing up a search
2277          * 3)  Allowing a new search
2278          */
2279         if (!update_lq && !done_search &&
2280             lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2281             && window->counter) {
2282                 enum rs_column next_column;
2283
2284                 /* Save current throughput to compare with "search" throughput*/
2285                 lq_sta->last_tpt = current_tpt;
2286
2287                 IWL_DEBUG_RATE(mvm,
2288                                "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2289                                update_lq, done_search, lq_sta->rs_state,
2290                                window->counter);
2291
2292                 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2293                 if (next_column != RS_COLUMN_INVALID) {
2294                         int ret = rs_switch_to_column(mvm, lq_sta, sta,
2295                                                       next_column);
2296                         if (!ret)
2297                                 lq_sta->search_better_tbl = 1;
2298                 } else {
2299                         IWL_DEBUG_RATE(mvm,
2300                                        "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2301                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2302                 }
2303
2304                 /* If new "search" mode was selected, set up in uCode table */
2305                 if (lq_sta->search_better_tbl) {
2306                         /* Access the "search" table, clear its history. */
2307                         tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
2308                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
2309
2310                         /* Use new "search" start rate */
2311                         index = tbl->rate.index;
2312
2313                         rs_dump_rate(mvm, &tbl->rate,
2314                                      "Switch to SEARCH TABLE:");
2315                         rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2316                 } else {
2317                         done_search = 1;
2318                 }
2319         }
2320
2321         if (!ndp)
2322                 rs_tl_turn_on_agg(mvm, mvmsta, tid, lq_sta, sta);
2323
2324         if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2325                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2326                 rs_set_stay_in_table(mvm, is_legacy(&tbl1->rate), lq_sta);
2327         }
2328 }
2329
2330 struct rs_init_rate_info {
2331         s8 rssi;
2332         u8 rate_idx;
2333 };
2334
2335 static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = {
2336         { -60, IWL_RATE_54M_INDEX },
2337         { -64, IWL_RATE_48M_INDEX },
2338         { -68, IWL_RATE_36M_INDEX },
2339         { -80, IWL_RATE_24M_INDEX },
2340         { -84, IWL_RATE_18M_INDEX },
2341         { -85, IWL_RATE_12M_INDEX },
2342         { -86, IWL_RATE_11M_INDEX },
2343         { -88, IWL_RATE_5M_INDEX  },
2344         { -90, IWL_RATE_2M_INDEX  },
2345         { S8_MIN, IWL_RATE_1M_INDEX },
2346 };
2347
2348 static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = {
2349         { -60, IWL_RATE_54M_INDEX },
2350         { -64, IWL_RATE_48M_INDEX },
2351         { -72, IWL_RATE_36M_INDEX },
2352         { -80, IWL_RATE_24M_INDEX },
2353         { -84, IWL_RATE_18M_INDEX },
2354         { -85, IWL_RATE_12M_INDEX },
2355         { -87, IWL_RATE_9M_INDEX  },
2356         { S8_MIN, IWL_RATE_6M_INDEX },
2357 };
2358
2359 static const struct rs_init_rate_info rs_optimal_rates_ht[] = {
2360         { -60, IWL_RATE_MCS_7_INDEX },
2361         { -64, IWL_RATE_MCS_6_INDEX },
2362         { -68, IWL_RATE_MCS_5_INDEX },
2363         { -72, IWL_RATE_MCS_4_INDEX },
2364         { -80, IWL_RATE_MCS_3_INDEX },
2365         { -84, IWL_RATE_MCS_2_INDEX },
2366         { -85, IWL_RATE_MCS_1_INDEX },
2367         { S8_MIN, IWL_RATE_MCS_0_INDEX},
2368 };
2369
2370 /* MCS index 9 is not valid for 20MHz VHT channel width,
2371  * but is ok for 40, 80 and 160MHz channels.
2372  */
2373 static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = {
2374         { -60, IWL_RATE_MCS_8_INDEX },
2375         { -64, IWL_RATE_MCS_7_INDEX },
2376         { -68, IWL_RATE_MCS_6_INDEX },
2377         { -72, IWL_RATE_MCS_5_INDEX },
2378         { -80, IWL_RATE_MCS_4_INDEX },
2379         { -84, IWL_RATE_MCS_3_INDEX },
2380         { -85, IWL_RATE_MCS_2_INDEX },
2381         { -87, IWL_RATE_MCS_1_INDEX },
2382         { S8_MIN, IWL_RATE_MCS_0_INDEX},
2383 };
2384
2385 static const struct rs_init_rate_info rs_optimal_rates_vht[] = {
2386         { -60, IWL_RATE_MCS_9_INDEX },
2387         { -64, IWL_RATE_MCS_8_INDEX },
2388         { -68, IWL_RATE_MCS_7_INDEX },
2389         { -72, IWL_RATE_MCS_6_INDEX },
2390         { -80, IWL_RATE_MCS_5_INDEX },
2391         { -84, IWL_RATE_MCS_4_INDEX },
2392         { -85, IWL_RATE_MCS_3_INDEX },
2393         { -87, IWL_RATE_MCS_2_INDEX },
2394         { -88, IWL_RATE_MCS_1_INDEX },
2395         { S8_MIN, IWL_RATE_MCS_0_INDEX },
2396 };
2397
2398 #define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */
2399
2400 /* Init the optimal rate based on STA caps
2401  * This combined with rssi is used to report the last tx rate
2402  * to userspace when we haven't transmitted enough frames.
2403  */
2404 static void rs_init_optimal_rate(struct iwl_mvm *mvm,
2405                                  struct ieee80211_sta *sta,
2406                                  struct iwl_lq_sta *lq_sta)
2407 {
2408         struct rs_rate *rate = &lq_sta->optimal_rate;
2409
2410         if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID)
2411                 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
2412         else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID)
2413                 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
2414         else if (lq_sta->band == NL80211_BAND_5GHZ)
2415                 rate->type = LQ_LEGACY_A;
2416         else
2417                 rate->type = LQ_LEGACY_G;
2418
2419         rate->bw = rs_bw_from_sta_bw(sta);
2420         rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL);
2421
2422         /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */
2423
2424         if (is_mimo(rate)) {
2425                 lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate;
2426         } else if (is_siso(rate)) {
2427                 lq_sta->optimal_rate_mask = lq_sta->active_siso_rate;
2428         } else {
2429                 lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate;
2430
2431                 if (lq_sta->band == NL80211_BAND_5GHZ) {
2432                         lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy;
2433                         lq_sta->optimal_nentries =
2434                                 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2435                 } else {
2436                         lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy;
2437                         lq_sta->optimal_nentries =
2438                                 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2439                 }
2440         }
2441
2442         if (is_vht(rate)) {
2443                 if (rate->bw == RATE_MCS_CHAN_WIDTH_20) {
2444                         lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz;
2445                         lq_sta->optimal_nentries =
2446                                 ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2447                 } else {
2448                         lq_sta->optimal_rates = rs_optimal_rates_vht;
2449                         lq_sta->optimal_nentries =
2450                                 ARRAY_SIZE(rs_optimal_rates_vht);
2451                 }
2452         } else if (is_ht(rate)) {
2453                 lq_sta->optimal_rates = rs_optimal_rates_ht;
2454                 lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2455         }
2456 }
2457
2458 /* Compute the optimal rate index based on RSSI */
2459 static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm,
2460                                            struct iwl_lq_sta *lq_sta)
2461 {
2462         struct rs_rate *rate = &lq_sta->optimal_rate;
2463         int i;
2464
2465         rate->index = find_first_bit(&lq_sta->optimal_rate_mask,
2466                                      BITS_PER_LONG);
2467
2468         for (i = 0; i < lq_sta->optimal_nentries; i++) {
2469                 int rate_idx = lq_sta->optimal_rates[i].rate_idx;
2470
2471                 if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) &&
2472                     (BIT(rate_idx) & lq_sta->optimal_rate_mask)) {
2473                         rate->index = rate_idx;
2474                         break;
2475                 }
2476         }
2477
2478         return rate;
2479 }
2480
2481 /* Choose an initial legacy rate and antenna to use based on the RSSI
2482  * of last Rx
2483  */
2484 static void rs_get_initial_rate(struct iwl_mvm *mvm,
2485                                 struct ieee80211_sta *sta,
2486                                 struct iwl_lq_sta *lq_sta,
2487                                 enum nl80211_band band,
2488                                 struct rs_rate *rate)
2489 {
2490         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2491         int i, nentries;
2492         unsigned long active_rate;
2493         s8 best_rssi = S8_MIN;
2494         u8 best_ant = ANT_NONE;
2495         u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2496         const struct rs_init_rate_info *initial_rates;
2497
2498         for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2499                 if (!(lq_sta->pers.chains & BIT(i)))
2500                         continue;
2501
2502                 if (lq_sta->pers.chain_signal[i] > best_rssi) {
2503                         best_rssi = lq_sta->pers.chain_signal[i];
2504                         best_ant = BIT(i);
2505                 }
2506         }
2507
2508         IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2509                        iwl_rs_pretty_ant(best_ant), best_rssi);
2510
2511         if (best_ant != ANT_A && best_ant != ANT_B)
2512                 rate->ant = first_antenna(valid_tx_ant);
2513         else
2514                 rate->ant = best_ant;
2515
2516         rate->sgi = false;
2517         rate->ldpc = false;
2518         rate->bw = RATE_MCS_CHAN_WIDTH_20;
2519
2520         rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2521                                      BITS_PER_LONG);
2522
2523         if (band == NL80211_BAND_5GHZ) {
2524                 rate->type = LQ_LEGACY_A;
2525                 initial_rates = rs_optimal_rates_5ghz_legacy;
2526                 nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2527         } else {
2528                 rate->type = LQ_LEGACY_G;
2529                 initial_rates = rs_optimal_rates_24ghz_legacy;
2530                 nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2531         }
2532
2533         if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE)
2534                 goto out;
2535
2536         /* Start from a higher rate if the corresponding debug capability
2537          * is enabled. The rate is chosen according to AP capabilities.
2538          * In case of VHT/HT when the rssi is low fallback to the case of
2539          * legacy rates.
2540          */
2541         if (sta->deflink.vht_cap.vht_supported &&
2542             best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2543                 /*
2544                  * In AP mode, when a new station associates, rs is initialized
2545                  * immediately upon association completion, before the phy
2546                  * context is updated with the association parameters, so the
2547                  * sta bandwidth might be wider than the phy context allows.
2548                  * To avoid this issue, always initialize rs with 20mhz
2549                  * bandwidth rate, and after authorization, when the phy context
2550                  * is already up-to-date, re-init rs with the correct bw.
2551                  */
2552                 u32 bw = mvmsta->sta_state < IEEE80211_STA_AUTHORIZED ?
2553                                 RATE_MCS_CHAN_WIDTH_20 : rs_bw_from_sta_bw(sta);
2554
2555                 switch (bw) {
2556                 case RATE_MCS_CHAN_WIDTH_40:
2557                 case RATE_MCS_CHAN_WIDTH_80:
2558                 case RATE_MCS_CHAN_WIDTH_160:
2559                         initial_rates = rs_optimal_rates_vht;
2560                         nentries = ARRAY_SIZE(rs_optimal_rates_vht);
2561                         break;
2562                 case RATE_MCS_CHAN_WIDTH_20:
2563                         initial_rates = rs_optimal_rates_vht_20mhz;
2564                         nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2565                         break;
2566                 default:
2567                         IWL_ERR(mvm, "Invalid BW %d\n",
2568                                 sta->deflink.bandwidth);
2569                         goto out;
2570                 }
2571
2572                 active_rate = lq_sta->active_siso_rate;
2573                 rate->type = LQ_VHT_SISO;
2574                 rate->bw = bw;
2575         } else if (sta->deflink.ht_cap.ht_supported &&
2576                    best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2577                 initial_rates = rs_optimal_rates_ht;
2578                 nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2579                 active_rate = lq_sta->active_siso_rate;
2580                 rate->type = LQ_HT_SISO;
2581         } else {
2582                 active_rate = lq_sta->active_legacy_rate;
2583         }
2584
2585         for (i = 0; i < nentries; i++) {
2586                 int rate_idx = initial_rates[i].rate_idx;
2587
2588                 if ((best_rssi >= initial_rates[i].rssi) &&
2589                     (BIT(rate_idx) & active_rate)) {
2590                         rate->index = rate_idx;
2591                         break;
2592                 }
2593         }
2594
2595 out:
2596         rs_dump_rate(mvm, rate, "INITIAL");
2597 }
2598
2599 /* Save info about RSSI of last Rx */
2600 void rs_update_last_rssi(struct iwl_mvm *mvm,
2601                          struct iwl_mvm_sta *mvmsta,
2602                          struct ieee80211_rx_status *rx_status)
2603 {
2604         struct iwl_lq_sta *lq_sta = &mvmsta->deflink.lq_sta.rs_drv;
2605         int i;
2606
2607         lq_sta->pers.chains = rx_status->chains;
2608         lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2609         lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2610         lq_sta->pers.last_rssi = S8_MIN;
2611
2612         for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2613                 if (!(lq_sta->pers.chains & BIT(i)))
2614                         continue;
2615
2616                 if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi)
2617                         lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i];
2618         }
2619 }
2620
2621 /*
2622  * rs_initialize_lq - Initialize a station's hardware rate table
2623  *
2624  * The uCode's station table contains a table of fallback rates
2625  * for automatic fallback during transmission.
2626  *
2627  * NOTE: This sets up a default set of values.  These will be replaced later
2628  *       if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2629  *       rc80211_simple.
2630  *
2631  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2632  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2633  *       which requires station table entry to exist).
2634  */
2635 static void rs_initialize_lq(struct iwl_mvm *mvm,
2636                              struct ieee80211_sta *sta,
2637                              struct iwl_lq_sta *lq_sta,
2638                              enum nl80211_band band)
2639 {
2640         struct iwl_scale_tbl_info *tbl;
2641         struct rs_rate *rate;
2642         u8 active_tbl = 0;
2643
2644         if (!sta || !lq_sta)
2645                 return;
2646
2647         if (!lq_sta->search_better_tbl)
2648                 active_tbl = lq_sta->active_tbl;
2649         else
2650                 active_tbl = rs_search_tbl(lq_sta->active_tbl);
2651
2652         tbl = &(lq_sta->lq_info[active_tbl]);
2653         rate = &tbl->rate;
2654
2655         rs_get_initial_rate(mvm, sta, lq_sta, band, rate);
2656         rs_init_optimal_rate(mvm, sta, lq_sta);
2657
2658         WARN_ONCE(rate->ant != ANT_A && rate->ant != ANT_B,
2659                   "ant: 0x%x, chains 0x%x, fw tx ant: 0x%x, nvm tx ant: 0x%x\n",
2660                   rate->ant, lq_sta->pers.chains, mvm->fw->valid_tx_ant,
2661                   mvm->nvm_data ? mvm->nvm_data->valid_tx_ant : ANT_INVALID);
2662
2663         tbl->column = rs_get_column_from_rate(rate);
2664
2665         rs_set_expected_tpt_table(lq_sta, tbl);
2666         rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2667         /* TODO restore station should remember the lq cmd */
2668         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq);
2669 }
2670
2671 static void rs_drv_get_rate(void *mvm_r, struct ieee80211_sta *sta,
2672                             void *mvm_sta,
2673                             struct ieee80211_tx_rate_control *txrc)
2674 {
2675         struct iwl_op_mode *op_mode = mvm_r;
2676         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2677         struct sk_buff *skb = txrc->skb;
2678         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2679         struct iwl_lq_sta *lq_sta;
2680         struct rs_rate *optimal_rate;
2681         u32 last_ucode_rate;
2682
2683         if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) {
2684                 /* if vif isn't initialized mvm doesn't know about
2685                  * this station, so don't do anything with the it
2686                  */
2687                 mvm_sta = NULL;
2688         }
2689
2690         if (!mvm_sta)
2691                 return;
2692
2693         lq_sta = mvm_sta;
2694         iwl_mvm_hwrate_to_tx_rate_v1(lq_sta->last_rate_n_flags,
2695                                      info->band, &info->control.rates[0]);
2696         info->control.rates[0].count = 1;
2697
2698         /* Report the optimal rate based on rssi and STA caps if we haven't
2699          * converged yet (too little traffic) or exploring other modulations
2700          */
2701         if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) {
2702                 optimal_rate = rs_get_optimal_rate(mvm, lq_sta);
2703                 last_ucode_rate = ucode_rate_from_rs_rate(mvm,
2704                                                           optimal_rate);
2705                 iwl_mvm_hwrate_to_tx_rate_v1(last_ucode_rate, info->band,
2706                                              &txrc->reported_rate);
2707         }
2708 }
2709
2710 static void *rs_drv_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2711                               gfp_t gfp)
2712 {
2713         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2714         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2715         struct iwl_mvm *mvm  = IWL_OP_MODE_GET_MVM(op_mode);
2716         struct iwl_lq_sta *lq_sta = &mvmsta->deflink.lq_sta.rs_drv;
2717
2718         IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2719
2720         lq_sta->pers.drv = mvm;
2721 #ifdef CONFIG_MAC80211_DEBUGFS
2722         lq_sta->pers.dbg_fixed_rate = 0;
2723         lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2724         lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
2725 #endif
2726         lq_sta->pers.chains = 0;
2727         memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
2728         lq_sta->pers.last_rssi = S8_MIN;
2729
2730         return lq_sta;
2731 }
2732
2733 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2734                                        int nss)
2735 {
2736         u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2737                 (0x3 << (2 * (nss - 1)));
2738         rx_mcs >>= (2 * (nss - 1));
2739
2740         if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2741                 return IWL_RATE_MCS_7_INDEX;
2742         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2743                 return IWL_RATE_MCS_8_INDEX;
2744         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2745                 return IWL_RATE_MCS_9_INDEX;
2746
2747         WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2748         return -1;
2749 }
2750
2751 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2752                                      struct ieee80211_sta_vht_cap *vht_cap,
2753                                      struct iwl_lq_sta *lq_sta)
2754 {
2755         int i;
2756         int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2757
2758         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2759                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2760                         if (i == IWL_RATE_9M_INDEX)
2761                                 continue;
2762
2763                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2764                         if (i == IWL_RATE_MCS_9_INDEX &&
2765                             sta->deflink.bandwidth == IEEE80211_STA_RX_BW_20)
2766                                 continue;
2767
2768                         lq_sta->active_siso_rate |= BIT(i);
2769                 }
2770         }
2771
2772         if (sta->deflink.rx_nss < 2)
2773                 return;
2774
2775         highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2776         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2777                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2778                         if (i == IWL_RATE_9M_INDEX)
2779                                 continue;
2780
2781                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2782                         if (i == IWL_RATE_MCS_9_INDEX &&
2783                             sta->deflink.bandwidth == IEEE80211_STA_RX_BW_20)
2784                                 continue;
2785
2786                         lq_sta->active_mimo2_rate |= BIT(i);
2787                 }
2788         }
2789 }
2790
2791 static void rs_ht_init(struct iwl_mvm *mvm,
2792                        struct ieee80211_sta *sta,
2793                        struct iwl_lq_sta *lq_sta,
2794                        struct ieee80211_sta_ht_cap *ht_cap)
2795 {
2796         /* active_siso_rate mask includes 9 MBits (bit 5),
2797          * and CCK (bits 0-3), supp_rates[] does not;
2798          * shift to convert format, force 9 MBits off.
2799          */
2800         lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2801         lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2802         lq_sta->active_siso_rate &= ~((u16)0x2);
2803         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2804
2805         lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2806         lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2807         lq_sta->active_mimo2_rate &= ~((u16)0x2);
2808         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2809
2810         if (mvm->cfg->ht_params->ldpc &&
2811             (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
2812                 lq_sta->ldpc = true;
2813
2814         if (mvm->cfg->ht_params->stbc &&
2815             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2816             (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC))
2817                 lq_sta->stbc_capable = true;
2818
2819         lq_sta->is_vht = false;
2820 }
2821
2822 static void rs_vht_init(struct iwl_mvm *mvm,
2823                         struct ieee80211_sta *sta,
2824                         struct iwl_lq_sta *lq_sta,
2825                         struct ieee80211_sta_vht_cap *vht_cap)
2826 {
2827         rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
2828
2829         if (mvm->cfg->ht_params->ldpc &&
2830             (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
2831                 lq_sta->ldpc = true;
2832
2833         if (mvm->cfg->ht_params->stbc &&
2834             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2835             (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))
2836                 lq_sta->stbc_capable = true;
2837
2838         if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) &&
2839             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2840             (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE))
2841                 lq_sta->bfer_capable = true;
2842
2843         lq_sta->is_vht = true;
2844 }
2845
2846 #ifdef CONFIG_IWLWIFI_DEBUGFS
2847 void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm)
2848 {
2849         spin_lock_bh(&mvm->drv_stats_lock);
2850         memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats));
2851         spin_unlock_bh(&mvm->drv_stats_lock);
2852 }
2853
2854 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg)
2855 {
2856         u8 nss = 0;
2857
2858         spin_lock(&mvm->drv_stats_lock);
2859
2860         if (agg)
2861                 mvm->drv_rx_stats.agg_frames++;
2862
2863         mvm->drv_rx_stats.success_frames++;
2864
2865         switch (rate & RATE_MCS_CHAN_WIDTH_MSK_V1) {
2866         case RATE_MCS_CHAN_WIDTH_20:
2867                 mvm->drv_rx_stats.bw_20_frames++;
2868                 break;
2869         case RATE_MCS_CHAN_WIDTH_40:
2870                 mvm->drv_rx_stats.bw_40_frames++;
2871                 break;
2872         case RATE_MCS_CHAN_WIDTH_80:
2873                 mvm->drv_rx_stats.bw_80_frames++;
2874                 break;
2875         case RATE_MCS_CHAN_WIDTH_160:
2876                 mvm->drv_rx_stats.bw_160_frames++;
2877                 break;
2878         default:
2879                 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
2880         }
2881
2882         if (rate & RATE_MCS_HT_MSK_V1) {
2883                 mvm->drv_rx_stats.ht_frames++;
2884                 nss = ((rate & RATE_HT_MCS_NSS_MSK_V1) >> RATE_HT_MCS_NSS_POS_V1) + 1;
2885         } else if (rate & RATE_MCS_VHT_MSK_V1) {
2886                 mvm->drv_rx_stats.vht_frames++;
2887                 nss = FIELD_GET(RATE_MCS_NSS_MSK, rate) + 1;
2888         } else {
2889                 mvm->drv_rx_stats.legacy_frames++;
2890         }
2891
2892         if (nss == 1)
2893                 mvm->drv_rx_stats.siso_frames++;
2894         else if (nss == 2)
2895                 mvm->drv_rx_stats.mimo2_frames++;
2896
2897         if (rate & RATE_MCS_SGI_MSK_V1)
2898                 mvm->drv_rx_stats.sgi_frames++;
2899         else
2900                 mvm->drv_rx_stats.ngi_frames++;
2901
2902         mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate;
2903         mvm->drv_rx_stats.last_frame_idx =
2904                 (mvm->drv_rx_stats.last_frame_idx + 1) %
2905                         ARRAY_SIZE(mvm->drv_rx_stats.last_rates);
2906
2907         spin_unlock(&mvm->drv_stats_lock);
2908 }
2909 #endif
2910
2911 /*
2912  * Called after adding a new station to initialize rate scaling
2913  */
2914 static void rs_drv_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2915                              enum nl80211_band band)
2916 {
2917         int i, j;
2918         struct ieee80211_hw *hw = mvm->hw;
2919         struct ieee80211_sta_ht_cap *ht_cap = &sta->deflink.ht_cap;
2920         struct ieee80211_sta_vht_cap *vht_cap = &sta->deflink.vht_cap;
2921         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2922         struct iwl_lq_sta *lq_sta = &mvmsta->deflink.lq_sta.rs_drv;
2923         struct ieee80211_supported_band *sband;
2924         unsigned long supp; /* must be unsigned long for for_each_set_bit */
2925
2926         lockdep_assert_held(&mvmsta->deflink.lq_sta.rs_drv.pers.lock);
2927
2928         /* clear all non-persistent lq data */
2929         memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
2930
2931         sband = hw->wiphy->bands[band];
2932
2933         lq_sta->lq.sta_id = mvmsta->deflink.sta_id;
2934         mvmsta->amsdu_enabled = 0;
2935         mvmsta->max_amsdu_len = sta->cur->max_amsdu_len;
2936
2937         for (j = 0; j < LQ_SIZE; j++)
2938                 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
2939
2940         lq_sta->flush_timer = 0;
2941         lq_sta->last_tx = jiffies;
2942
2943         IWL_DEBUG_RATE(mvm,
2944                        "LQ: *** rate scale station global init for station %d ***\n",
2945                        mvmsta->deflink.sta_id);
2946         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2947          * the lowest or the highest rate.. Could consider using RSSI from
2948          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2949          * after assoc.. */
2950
2951         lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
2952         lq_sta->band = sband->band;
2953         /*
2954          * active legacy rates as per supported rates bitmap
2955          */
2956         supp = sta->deflink.supp_rates[sband->band];
2957         lq_sta->active_legacy_rate = 0;
2958         for_each_set_bit(i, &supp, BITS_PER_LONG)
2959                 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2960
2961         /* TODO: should probably account for rx_highest for both HT/VHT */
2962         if (!vht_cap || !vht_cap->vht_supported)
2963                 rs_ht_init(mvm, sta, lq_sta, ht_cap);
2964         else
2965                 rs_vht_init(mvm, sta, lq_sta, vht_cap);
2966
2967         lq_sta->max_legacy_rate_idx =
2968                 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate);
2969         lq_sta->max_siso_rate_idx =
2970                 rs_get_max_rate_from_mask(lq_sta->active_siso_rate);
2971         lq_sta->max_mimo2_rate_idx =
2972                 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate);
2973
2974         IWL_DEBUG_RATE(mvm,
2975                        "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n",
2976                        lq_sta->active_legacy_rate,
2977                        lq_sta->active_siso_rate,
2978                        lq_sta->active_mimo2_rate,
2979                        lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable,
2980                        lq_sta->bfer_capable);
2981         IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
2982                        lq_sta->max_legacy_rate_idx,
2983                        lq_sta->max_siso_rate_idx,
2984                        lq_sta->max_mimo2_rate_idx);
2985
2986         /* These values will be overridden later */
2987         lq_sta->lq.single_stream_ant_msk =
2988                 iwl_mvm_bt_coex_get_single_ant_msk(mvm, iwl_mvm_get_valid_tx_ant(mvm));
2989         lq_sta->lq.dual_stream_ant_msk = ANT_AB;
2990
2991         /* as default allow aggregation for all tids */
2992         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2993         lq_sta->is_agg = 0;
2994 #ifdef CONFIG_IWLWIFI_DEBUGFS
2995         iwl_mvm_reset_frame_stats(mvm);
2996 #endif
2997         rs_initialize_lq(mvm, sta, lq_sta, band);
2998 }
2999
3000 static void rs_drv_rate_update(void *mvm_r,
3001                                struct ieee80211_supported_band *sband,
3002                                struct cfg80211_chan_def *chandef,
3003                                struct ieee80211_sta *sta,
3004                                void *priv_sta, u32 changed)
3005 {
3006         struct iwl_op_mode *op_mode = mvm_r;
3007         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3008         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3009         u8 tid;
3010
3011         if (!mvmsta->vif)
3012                 return;
3013
3014         /* Stop any ongoing aggregations as rs starts off assuming no agg */
3015         for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
3016                 ieee80211_stop_tx_ba_session(sta, tid);
3017
3018         iwl_mvm_rs_rate_init(mvm, mvmsta->vif, sta,
3019                              &mvmsta->vif->bss_conf, &sta->deflink,
3020                              sband->band);
3021 }
3022
3023 static void __iwl_mvm_rs_tx_status(struct iwl_mvm *mvm,
3024                                    struct ieee80211_sta *sta,
3025                                    int tid, struct ieee80211_tx_info *info,
3026                                    bool ndp)
3027 {
3028         int legacy_success;
3029         int retries;
3030         int i;
3031         struct iwl_lq_cmd *table;
3032         u32 lq_hwrate;
3033         struct rs_rate lq_rate, tx_resp_rate;
3034         struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
3035         u32 tlc_info = (uintptr_t)info->status.status_driver_data[0];
3036         u8 reduced_txp = tlc_info & RS_DRV_DATA_TXP_MSK;
3037         u8 lq_color = RS_DRV_DATA_LQ_COLOR_GET(tlc_info);
3038         u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1];
3039         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3040         struct iwl_lq_sta *lq_sta = &mvmsta->deflink.lq_sta.rs_drv;
3041
3042         if (!lq_sta->pers.drv) {
3043                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
3044                 return;
3045         }
3046
3047         /* This packet was aggregated but doesn't carry status info */
3048         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
3049             !(info->flags & IEEE80211_TX_STAT_AMPDU))
3050                 return;
3051
3052         if (rs_rate_from_ucode_rate(tx_resp_hwrate, info->band,
3053                                     &tx_resp_rate)) {
3054                 WARN_ON_ONCE(1);
3055                 return;
3056         }
3057
3058 #ifdef CONFIG_MAC80211_DEBUGFS
3059         /* Disable last tx check if we are debugging with fixed rate but
3060          * update tx stats
3061          */
3062         if (lq_sta->pers.dbg_fixed_rate) {
3063                 int index = tx_resp_rate.index;
3064                 enum rs_column column;
3065                 int attempts, success;
3066
3067                 column = rs_get_column_from_rate(&tx_resp_rate);
3068                 if (WARN_ONCE(column == RS_COLUMN_INVALID,
3069                               "Can't map rate 0x%x to column",
3070                               tx_resp_hwrate))
3071                         return;
3072
3073                 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
3074                         attempts = info->status.ampdu_len;
3075                         success = info->status.ampdu_ack_len;
3076                 } else {
3077                         attempts = info->status.rates[0].count;
3078                         success = !!(info->flags & IEEE80211_TX_STAT_ACK);
3079                 }
3080
3081                 lq_sta->pers.tx_stats[column][index].total += attempts;
3082                 lq_sta->pers.tx_stats[column][index].success += success;
3083
3084                 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n",
3085                                tx_resp_hwrate, success, attempts);
3086                 return;
3087         }
3088 #endif
3089
3090         if (time_after(jiffies,
3091                        (unsigned long)(lq_sta->last_tx +
3092                                        (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
3093                 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
3094                 /* reach here only in case of driver RS, call directly
3095                  * the unlocked version
3096                  */
3097                 rs_drv_rate_init(mvm, sta, info->band);
3098                 return;
3099         }
3100         lq_sta->last_tx = jiffies;
3101
3102         /* Ignore this Tx frame response if its initial rate doesn't match
3103          * that of latest Link Quality command.  There may be stragglers
3104          * from a previous Link Quality command, but we're no longer interested
3105          * in those; they're either from the "active" mode while we're trying
3106          * to check "search" mode, or a prior "search" mode after we've moved
3107          * to a new "search" mode (which might become the new "active" mode).
3108          */
3109         table = &lq_sta->lq;
3110         lq_hwrate = le32_to_cpu(table->rs_table[0]);
3111         if (rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate)) {
3112                 WARN_ON_ONCE(1);
3113                 return;
3114         }
3115
3116         /* Here we actually compare this rate to the latest LQ command */
3117         if (lq_color != LQ_FLAG_COLOR_GET(table->flags)) {
3118                 IWL_DEBUG_RATE(mvm,
3119                                "tx resp color 0x%x does not match 0x%x\n",
3120                                lq_color, LQ_FLAG_COLOR_GET(table->flags));
3121
3122                 /* Since rates mis-match, the last LQ command may have failed.
3123                  * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
3124                  * ... driver.
3125                  */
3126                 lq_sta->missed_rate_counter++;
3127                 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
3128                         lq_sta->missed_rate_counter = 0;
3129                         IWL_DEBUG_RATE(mvm,
3130                                        "Too many rates mismatch. Send sync LQ. rs_state %d\n",
3131                                        lq_sta->rs_state);
3132                         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq);
3133                 }
3134                 /* Regardless, ignore this status info for outdated rate */
3135                 return;
3136         }
3137
3138         /* Rate did match, so reset the missed_rate_counter */
3139         lq_sta->missed_rate_counter = 0;
3140
3141         if (!lq_sta->search_better_tbl) {
3142                 curr_tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3143                 other_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
3144         } else {
3145                 curr_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
3146                 other_tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3147         }
3148
3149         if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) {
3150                 IWL_DEBUG_RATE(mvm,
3151                                "Neither active nor search matches tx rate\n");
3152                 tmp_tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3153                 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
3154                 tmp_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
3155                 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
3156                 rs_dump_rate(mvm, &lq_rate, "ACTUAL");
3157
3158                 /* no matching table found, let's by-pass the data collection
3159                  * and continue to perform rate scale to find the rate table
3160                  */
3161                 rs_stay_in_table(lq_sta, true);
3162                 goto done;
3163         }
3164
3165         /* Updating the frame history depends on whether packets were
3166          * aggregated.
3167          *
3168          * For aggregation, all packets were transmitted at the same rate, the
3169          * first index into rate scale table.
3170          */
3171         if (info->flags & IEEE80211_TX_STAT_AMPDU) {
3172                 rs_collect_tpc_data(mvm, lq_sta, curr_tbl, tx_resp_rate.index,
3173                                     info->status.ampdu_len,
3174                                     info->status.ampdu_ack_len,
3175                                     reduced_txp);
3176
3177                 /* ampdu_ack_len = 0 marks no BA was received. For TLC, treat
3178                  * it as a single frame loss as we don't want the success ratio
3179                  * to dip too quickly because a BA wasn't received.
3180                  * For TPC, there's no need for this optimisation since we want
3181                  * to recover very quickly from a bad power reduction and,
3182                  * therefore we'd like the success ratio to get an immediate hit
3183                  * when failing to get a BA, so we'd switch back to a lower or
3184                  * zero power reduction. When FW transmits agg with a rate
3185                  * different from the initial rate, it will not use reduced txp
3186                  * and will send BA notification twice (one empty with reduced
3187                  * txp equal to the value from LQ and one with reduced txp 0).
3188                  * We need to update counters for each txp level accordingly.
3189                  */
3190                 if (info->status.ampdu_ack_len == 0)
3191                         info->status.ampdu_len = 1;
3192
3193                 rs_collect_tlc_data(mvm, mvmsta, tid, curr_tbl,
3194                                     tx_resp_rate.index,
3195                                     info->status.ampdu_len,
3196                                     info->status.ampdu_ack_len);
3197
3198                 /* Update success/fail counts if not searching for new mode */
3199                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
3200                         lq_sta->total_success += info->status.ampdu_ack_len;
3201                         lq_sta->total_failed += (info->status.ampdu_len -
3202                                         info->status.ampdu_ack_len);
3203                 }
3204         } else {
3205                 /* For legacy, update frame history with for each Tx retry. */
3206                 retries = info->status.rates[0].count - 1;
3207                 /* HW doesn't send more than 15 retries */
3208                 retries = min(retries, 15);
3209
3210                 /* The last transmission may have been successful */
3211                 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
3212                 /* Collect data for each rate used during failed TX attempts */
3213                 for (i = 0; i <= retries; ++i) {
3214                         lq_hwrate = le32_to_cpu(table->rs_table[i]);
3215                         if (rs_rate_from_ucode_rate(lq_hwrate, info->band,
3216                                                     &lq_rate)) {
3217                                 WARN_ON_ONCE(1);
3218                                 return;
3219                         }
3220
3221                         /* Only collect stats if retried rate is in the same RS
3222                          * table as active/search.
3223                          */
3224                         if (rs_rate_column_match(&lq_rate, &curr_tbl->rate))
3225                                 tmp_tbl = curr_tbl;
3226                         else if (rs_rate_column_match(&lq_rate,
3227                                                       &other_tbl->rate))
3228                                 tmp_tbl = other_tbl;
3229                         else
3230                                 continue;
3231
3232                         rs_collect_tpc_data(mvm, lq_sta, tmp_tbl,
3233                                             tx_resp_rate.index, 1,
3234                                             i < retries ? 0 : legacy_success,
3235                                             reduced_txp);
3236                         rs_collect_tlc_data(mvm, mvmsta, tid, tmp_tbl,
3237                                             tx_resp_rate.index, 1,
3238                                             i < retries ? 0 : legacy_success);
3239                 }
3240
3241                 /* Update success/fail counts if not searching for new mode */
3242                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
3243                         lq_sta->total_success += legacy_success;
3244                         lq_sta->total_failed += retries + (1 - legacy_success);
3245                 }
3246         }
3247         /* The last TX rate is cached in lq_sta; it's set in if/else above */
3248         lq_sta->last_rate_n_flags = lq_hwrate;
3249         IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
3250 done:
3251         /* See if there's a better rate or modulation mode to try. */
3252         if (sta->deflink.supp_rates[info->band])
3253                 rs_rate_scale_perform(mvm, sta, lq_sta, tid, ndp);
3254 }
3255
3256 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
3257                           int tid, struct ieee80211_tx_info *info, bool ndp)
3258 {
3259         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3260
3261         /* If it's locked we are in middle of init flow
3262          * just wait for next tx status to update the lq_sta data
3263          */
3264         if (!spin_trylock(&mvmsta->deflink.lq_sta.rs_drv.pers.lock))
3265                 return;
3266
3267         __iwl_mvm_rs_tx_status(mvm, sta, tid, info, ndp);
3268         spin_unlock(&mvmsta->deflink.lq_sta.rs_drv.pers.lock);
3269 }
3270
3271 #ifdef CONFIG_MAC80211_DEBUGFS
3272 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
3273                                             struct iwl_lq_cmd *lq_cmd,
3274                                             enum nl80211_band band,
3275                                             u32 ucode_rate)
3276 {
3277         struct rs_rate rate;
3278         int i;
3279         int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
3280         __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
3281         u8 ant = (ucode_rate & RATE_MCS_ANT_AB_MSK) >> RATE_MCS_ANT_POS;
3282
3283         for (i = 0; i < num_rates; i++)
3284                 lq_cmd->rs_table[i] = ucode_rate_le32;
3285
3286         if (rs_rate_from_ucode_rate(ucode_rate, band, &rate)) {
3287                 WARN_ON_ONCE(1);
3288                 return;
3289         }
3290
3291         if (is_mimo(&rate))
3292                 lq_cmd->mimo_delim = num_rates - 1;
3293         else
3294                 lq_cmd->mimo_delim = 0;
3295
3296         lq_cmd->reduced_tpc = 0;
3297
3298         if (num_of_ant(ant) == 1)
3299                 lq_cmd->single_stream_ant_msk = ant;
3300
3301         if (!mvm->trans->trans_cfg->gen2)
3302                 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3303         else
3304                 lq_cmd->agg_frame_cnt_limit =
3305                         LINK_QUAL_AGG_FRAME_LIMIT_GEN2_DEF;
3306 }
3307 #endif /* CONFIG_MAC80211_DEBUGFS */
3308
3309 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
3310                                      struct iwl_lq_sta *lq_sta,
3311                                      struct rs_rate *rate,
3312                                      __le32 *rs_table, int *rs_table_index,
3313                                      int num_rates, int num_retries,
3314                                      u8 valid_tx_ant, bool toggle_ant)
3315 {
3316         int i, j;
3317         __le32 ucode_rate;
3318         bool bottom_reached = false;
3319         int prev_rate_idx = rate->index;
3320         int end = LINK_QUAL_MAX_RETRY_NUM;
3321         int index = *rs_table_index;
3322
3323         for (i = 0; i < num_rates && index < end; i++) {
3324                 for (j = 0; j < num_retries && index < end; j++, index++) {
3325                         ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
3326                                                                          rate));
3327                         rs_table[index] = ucode_rate;
3328                         if (toggle_ant)
3329                                 rs_toggle_antenna(valid_tx_ant, rate);
3330                 }
3331
3332                 prev_rate_idx = rate->index;
3333                 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
3334                 if (bottom_reached && !is_legacy(rate))
3335                         break;
3336         }
3337
3338         if (!bottom_reached && !is_legacy(rate))
3339                 rate->index = prev_rate_idx;
3340
3341         *rs_table_index = index;
3342 }
3343
3344 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
3345  * column the rate table should look like this:
3346  *
3347  * rate[0] 0x400F019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3348  * rate[1] 0x400F019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3349  * rate[2] 0x400F018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3350  * rate[3] 0x400F018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3351  * rate[4] 0x400F017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3352  * rate[5] 0x400F017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3353  * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
3354  * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
3355  * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
3356  * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
3357  * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
3358  * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
3359  * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
3360  * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
3361  * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
3362  * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
3363  */
3364 static void rs_build_rates_table(struct iwl_mvm *mvm,
3365                                  struct ieee80211_sta *sta,
3366                                  struct iwl_lq_sta *lq_sta,
3367                                  const struct rs_rate *initial_rate)
3368 {
3369         struct rs_rate rate;
3370         int num_rates, num_retries, index = 0;
3371         u8 valid_tx_ant = 0;
3372         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3373         bool toggle_ant = false;
3374         u32 color;
3375
3376         memcpy(&rate, initial_rate, sizeof(rate));
3377
3378         valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
3379
3380         /* TODO: remove old API when min FW API hits 14 */
3381         if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) &&
3382             rs_stbc_allow(mvm, sta, lq_sta))
3383                 rate.stbc = true;
3384
3385         if (is_siso(&rate)) {
3386                 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
3387                 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3388         } else if (is_mimo(&rate)) {
3389                 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
3390                 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3391         } else {
3392                 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
3393                 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
3394                 toggle_ant = true;
3395         }
3396
3397         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3398                                  num_rates, num_retries, valid_tx_ant,
3399                                  toggle_ant);
3400
3401         rs_get_lower_rate_down_column(lq_sta, &rate);
3402
3403         if (is_siso(&rate)) {
3404                 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
3405                 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
3406                 lq_cmd->mimo_delim = index;
3407         } else if (is_legacy(&rate)) {
3408                 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3409                 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3410         } else {
3411                 WARN_ON_ONCE(1);
3412         }
3413
3414         toggle_ant = true;
3415
3416         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3417                                  num_rates, num_retries, valid_tx_ant,
3418                                  toggle_ant);
3419
3420         rs_get_lower_rate_down_column(lq_sta, &rate);
3421
3422         num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3423         num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3424
3425         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3426                                  num_rates, num_retries, valid_tx_ant,
3427                                  toggle_ant);
3428
3429         /* update the color of the LQ command (as a counter at bits 1-3) */
3430         color = LQ_FLAGS_COLOR_INC(LQ_FLAG_COLOR_GET(lq_cmd->flags));
3431         lq_cmd->flags = LQ_FLAG_COLOR_SET(lq_cmd->flags, color);
3432 }
3433
3434 struct rs_bfer_active_iter_data {
3435         struct ieee80211_sta *exclude_sta;
3436         struct iwl_mvm_sta *bfer_mvmsta;
3437 };
3438
3439 static void rs_bfer_active_iter(void *_data,
3440                                 struct ieee80211_sta *sta)
3441 {
3442         struct rs_bfer_active_iter_data *data = _data;
3443         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3444         struct iwl_lq_cmd *lq_cmd = &mvmsta->deflink.lq_sta.rs_drv.lq;
3445         u32 ss_params = le32_to_cpu(lq_cmd->ss_params);
3446
3447         if (sta == data->exclude_sta)
3448                 return;
3449
3450         /* The current sta has BFER allowed */
3451         if (ss_params & LQ_SS_BFER_ALLOWED) {
3452                 WARN_ON_ONCE(data->bfer_mvmsta != NULL);
3453
3454                 data->bfer_mvmsta = mvmsta;
3455         }
3456 }
3457
3458 static int rs_bfer_priority(struct iwl_mvm_sta *sta)
3459 {
3460         int prio = -1;
3461         enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif);
3462
3463         switch (viftype) {
3464         case NL80211_IFTYPE_AP:
3465         case NL80211_IFTYPE_P2P_GO:
3466                 prio = 3;
3467                 break;
3468         case NL80211_IFTYPE_P2P_CLIENT:
3469                 prio = 2;
3470                 break;
3471         case NL80211_IFTYPE_STATION:
3472                 prio = 1;
3473                 break;
3474         default:
3475                 WARN_ONCE(true, "viftype %d sta_id %d", viftype,
3476                           sta->deflink.sta_id);
3477                 prio = -1;
3478         }
3479
3480         return prio;
3481 }
3482
3483 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */
3484 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1,
3485                                 struct iwl_mvm_sta *sta2)
3486 {
3487         int prio1 = rs_bfer_priority(sta1);
3488         int prio2 = rs_bfer_priority(sta2);
3489
3490         if (prio1 > prio2)
3491                 return 1;
3492         if (prio1 < prio2)
3493                 return -1;
3494         return 0;
3495 }
3496
3497 static void rs_set_lq_ss_params(struct iwl_mvm *mvm,
3498                                 struct ieee80211_sta *sta,
3499                                 struct iwl_lq_sta *lq_sta,
3500                                 const struct rs_rate *initial_rate)
3501 {
3502         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3503         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3504         struct rs_bfer_active_iter_data data = {
3505                 .exclude_sta = sta,
3506                 .bfer_mvmsta = NULL,
3507         };
3508         struct iwl_mvm_sta *bfer_mvmsta = NULL;
3509         u32 ss_params = LQ_SS_PARAMS_VALID;
3510
3511         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
3512                 goto out;
3513
3514 #ifdef CONFIG_MAC80211_DEBUGFS
3515         /* Check if forcing the decision is configured.
3516          * Note that SISO is forced by not allowing STBC or BFER
3517          */
3518         if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC)
3519                 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE);
3520         else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER)
3521                 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE);
3522
3523         if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) {
3524                 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n",
3525                                lq_sta->pers.ss_force);
3526                 goto out;
3527         }
3528 #endif
3529
3530         if (lq_sta->stbc_capable)
3531                 ss_params |= LQ_SS_STBC_1SS_ALLOWED;
3532
3533         if (!lq_sta->bfer_capable)
3534                 goto out;
3535
3536         ieee80211_iterate_stations_atomic(mvm->hw,
3537                                           rs_bfer_active_iter,
3538                                           &data);
3539         bfer_mvmsta = data.bfer_mvmsta;
3540
3541         /* This code is safe as it doesn't run concurrently for different
3542          * stations. This is guaranteed by the fact that calls to
3543          * ieee80211_tx_status wouldn't run concurrently for a single HW.
3544          */
3545         if (!bfer_mvmsta) {
3546                 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n");
3547
3548                 ss_params |= LQ_SS_BFER_ALLOWED;
3549                 goto out;
3550         }
3551
3552         IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n",
3553                        bfer_mvmsta->deflink.sta_id);
3554
3555         /* Disallow BFER on another STA if active and we're a higher priority */
3556         if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) {
3557                 struct iwl_lq_cmd *bfersta_lq_cmd =
3558                         &bfer_mvmsta->deflink.lq_sta.rs_drv.lq;
3559                 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params);
3560
3561                 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED;
3562                 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params);
3563                 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd);
3564
3565                 ss_params |= LQ_SS_BFER_ALLOWED;
3566                 IWL_DEBUG_RATE(mvm,
3567                                "Lower priority BFER sta found (%d). Switch BFER\n",
3568                                bfer_mvmsta->deflink.sta_id);
3569         }
3570 out:
3571         lq_cmd->ss_params = cpu_to_le32(ss_params);
3572 }
3573
3574 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
3575                            struct ieee80211_sta *sta,
3576                            struct iwl_lq_sta *lq_sta,
3577                            const struct rs_rate *initial_rate)
3578 {
3579         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3580         struct iwl_mvm_sta *mvmsta;
3581         struct iwl_mvm_vif *mvmvif;
3582
3583         lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
3584         lq_cmd->agg_time_limit =
3585                 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
3586
3587 #ifdef CONFIG_MAC80211_DEBUGFS
3588         if (lq_sta->pers.dbg_fixed_rate) {
3589                 rs_build_rates_table_from_fixed(mvm, lq_cmd,
3590                                                 lq_sta->band,
3591                                                 lq_sta->pers.dbg_fixed_rate);
3592                 return;
3593         }
3594 #endif
3595         if (WARN_ON_ONCE(!sta || !initial_rate))
3596                 return;
3597
3598         rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
3599
3600         if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS))
3601                 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate);
3602
3603         mvmsta = iwl_mvm_sta_from_mac80211(sta);
3604         mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
3605
3606         if (!fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_COEX_SCHEMA_2) &&
3607             num_of_ant(initial_rate->ant) == 1)
3608                 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3609
3610         lq_cmd->agg_frame_cnt_limit = lq_sta->pers.max_agg_bufsize;
3611
3612         /*
3613          * In case of low latency, tell the firmware to leave a frame in the
3614          * Tx Fifo so that it can start a transaction in the same TxOP. This
3615          * basically allows the firmware to send bursts.
3616          */
3617         if (iwl_mvm_vif_low_latency(mvmvif))
3618                 lq_cmd->agg_frame_cnt_limit--;
3619
3620         if (mvmsta->vif->p2p)
3621                 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
3622
3623         lq_cmd->agg_time_limit =
3624                         cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
3625 }
3626
3627 static void *rs_alloc(struct ieee80211_hw *hw)
3628 {
3629         return hw->priv;
3630 }
3631
3632 /* rate scale requires free function to be implemented */
3633 static void rs_free(void *mvm_rate)
3634 {
3635         return;
3636 }
3637
3638 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta)
3639 {
3640         struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
3641         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3642
3643         IWL_DEBUG_RATE(mvm, "enter\n");
3644         IWL_DEBUG_RATE(mvm, "leave\n");
3645 }
3646
3647 int rs_pretty_print_rate_v1(char *buf, int bufsz, const u32 rate)
3648 {
3649
3650         char *type;
3651         u8 mcs = 0, nss = 0;
3652         u8 ant = (rate & RATE_MCS_ANT_AB_MSK) >> RATE_MCS_ANT_POS;
3653         u32 bw = (rate & RATE_MCS_CHAN_WIDTH_MSK_V1) >>
3654                 RATE_MCS_CHAN_WIDTH_POS;
3655
3656         if (!(rate & RATE_MCS_HT_MSK_V1) &&
3657             !(rate & RATE_MCS_VHT_MSK_V1) &&
3658             !(rate & RATE_MCS_HE_MSK_V1)) {
3659                 int index = iwl_hwrate_to_plcp_idx(rate);
3660
3661                 return scnprintf(buf, bufsz, "Legacy | ANT: %s Rate: %s Mbps",
3662                                  iwl_rs_pretty_ant(ant),
3663                                  index == IWL_RATE_INVALID ? "BAD" :
3664                                  iwl_rate_mcs(index)->mbps);
3665         }
3666
3667         if (rate & RATE_MCS_VHT_MSK_V1) {
3668                 type = "VHT";
3669                 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3670                 nss = FIELD_GET(RATE_MCS_NSS_MSK, rate) + 1;
3671         } else if (rate & RATE_MCS_HT_MSK_V1) {
3672                 type = "HT";
3673                 mcs = rate & RATE_HT_MCS_INDEX_MSK_V1;
3674                 nss = ((rate & RATE_HT_MCS_NSS_MSK_V1)
3675                        >> RATE_HT_MCS_NSS_POS_V1) + 1;
3676         } else if (rate & RATE_MCS_HE_MSK_V1) {
3677                 type = "HE";
3678                 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3679                 nss = FIELD_GET(RATE_MCS_NSS_MSK, rate) + 1;
3680         } else {
3681                 type = "Unknown"; /* shouldn't happen */
3682         }
3683
3684         return scnprintf(buf, bufsz,
3685                          "0x%x: %s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s",
3686                          rate, type, iwl_rs_pretty_ant(ant), iwl_rs_pretty_bw(bw), mcs, nss,
3687                          (rate & RATE_MCS_SGI_MSK_V1) ? "SGI " : "NGI ",
3688                          (rate & RATE_MCS_STBC_MSK) ? "STBC " : "",
3689                          (rate & RATE_MCS_LDPC_MSK_V1) ? "LDPC " : "",
3690                          (rate & RATE_HE_DUAL_CARRIER_MODE_MSK) ? "DCM " : "",
3691                          (rate & RATE_MCS_BF_MSK) ? "BF " : "");
3692 }
3693
3694 #ifdef CONFIG_MAC80211_DEBUGFS
3695 /*
3696  * Program the device to use fixed rate for frame transmit
3697  * This is for debugging/testing only
3698  * once the device start use fixed rate, we need to reload the module
3699  * to being back the normal operation.
3700  */
3701 static void rs_program_fix_rate(struct iwl_mvm *mvm,
3702                                 struct iwl_lq_sta *lq_sta)
3703 {
3704         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
3705         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
3706         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
3707
3708         IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
3709                        lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
3710
3711         if (lq_sta->pers.dbg_fixed_rate) {
3712                 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
3713                 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq);
3714         }
3715 }
3716
3717 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3718                         const char __user *user_buf, size_t count, loff_t *ppos)
3719 {
3720         struct iwl_lq_sta *lq_sta = file->private_data;
3721         struct iwl_mvm *mvm;
3722         char buf[64];
3723         size_t buf_size;
3724         u32 parsed_rate;
3725
3726         mvm = lq_sta->pers.drv;
3727         memset(buf, 0, sizeof(buf));
3728         buf_size = min(count, sizeof(buf) -  1);
3729         if (copy_from_user(buf, user_buf, buf_size))
3730                 return -EFAULT;
3731
3732         if (sscanf(buf, "%x", &parsed_rate) == 1)
3733                 lq_sta->pers.dbg_fixed_rate = parsed_rate;
3734         else
3735                 lq_sta->pers.dbg_fixed_rate = 0;
3736
3737         rs_program_fix_rate(mvm, lq_sta);
3738
3739         return count;
3740 }
3741
3742 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3743                         char __user *user_buf, size_t count, loff_t *ppos)
3744 {
3745         char *buff;
3746         int desc = 0;
3747         int i = 0;
3748         ssize_t ret;
3749         static const size_t bufsz = 2048;
3750
3751         struct iwl_lq_sta *lq_sta = file->private_data;
3752         struct iwl_mvm_sta *mvmsta =
3753                 container_of(lq_sta, struct iwl_mvm_sta, deflink.lq_sta.rs_drv);
3754         struct iwl_mvm *mvm;
3755         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3756         struct rs_rate *rate = &tbl->rate;
3757         u32 ss_params;
3758
3759         mvm = lq_sta->pers.drv;
3760         buff = kmalloc(bufsz, GFP_KERNEL);
3761         if (!buff)
3762                 return -ENOMEM;
3763
3764         desc += scnprintf(buff + desc, bufsz - desc,
3765                           "sta_id %d\n", lq_sta->lq.sta_id);
3766         desc += scnprintf(buff + desc, bufsz - desc,
3767                           "failed=%d success=%d rate=0%lX\n",
3768                           lq_sta->total_failed, lq_sta->total_success,
3769                           lq_sta->active_legacy_rate);
3770         desc += scnprintf(buff + desc, bufsz - desc, "fixed rate 0x%X\n",
3771                           lq_sta->pers.dbg_fixed_rate);
3772         desc += scnprintf(buff + desc, bufsz - desc, "valid_tx_ant %s%s\n",
3773             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
3774             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "");
3775         desc += scnprintf(buff + desc, bufsz - desc, "lq type %s\n",
3776                           (is_legacy(rate)) ? "legacy" :
3777                           is_vht(rate) ? "VHT" : "HT");
3778         if (!is_legacy(rate)) {
3779                 desc += scnprintf(buff + desc, bufsz - desc, " %s",
3780                    (is_siso(rate)) ? "SISO" : "MIMO2");
3781                 desc += scnprintf(buff + desc, bufsz - desc, " %s",
3782                                 (is_ht20(rate)) ? "20MHz" :
3783                                 (is_ht40(rate)) ? "40MHz" :
3784                                 (is_ht80(rate)) ? "80MHz" :
3785                                 (is_ht160(rate)) ? "160MHz" : "BAD BW");
3786                 desc += scnprintf(buff + desc, bufsz - desc, " %s %s %s %s\n",
3787                                 (rate->sgi) ? "SGI" : "NGI",
3788                                 (rate->ldpc) ? "LDPC" : "BCC",
3789                                 (lq_sta->is_agg) ? "AGG on" : "",
3790                                 (mvmsta->amsdu_enabled) ? "AMSDU on" : "");
3791         }
3792         desc += scnprintf(buff + desc, bufsz - desc, "last tx rate=0x%X\n",
3793                         lq_sta->last_rate_n_flags);
3794         desc += scnprintf(buff + desc, bufsz - desc,
3795                         "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3796                         lq_sta->lq.flags,
3797                         lq_sta->lq.mimo_delim,
3798                         lq_sta->lq.single_stream_ant_msk,
3799                         lq_sta->lq.dual_stream_ant_msk);
3800
3801         desc += scnprintf(buff + desc, bufsz - desc,
3802                         "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3803                         le16_to_cpu(lq_sta->lq.agg_time_limit),
3804                         lq_sta->lq.agg_disable_start_th,
3805                         lq_sta->lq.agg_frame_cnt_limit);
3806
3807         desc += scnprintf(buff + desc, bufsz - desc, "reduced tpc=%d\n",
3808                           lq_sta->lq.reduced_tpc);
3809         ss_params = le32_to_cpu(lq_sta->lq.ss_params);
3810         desc += scnprintf(buff + desc, bufsz - desc,
3811                         "single stream params: %s%s%s%s\n",
3812                         (ss_params & LQ_SS_PARAMS_VALID) ?
3813                         "VALID" : "INVALID",
3814                         (ss_params & LQ_SS_BFER_ALLOWED) ?
3815                         ", BFER" : "",
3816                         (ss_params & LQ_SS_STBC_1SS_ALLOWED) ?
3817                         ", STBC" : "",
3818                         (ss_params & LQ_SS_FORCE) ?
3819                         ", FORCE" : "");
3820         desc += scnprintf(buff + desc, bufsz - desc,
3821                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3822                         lq_sta->lq.initial_rate_index[0],
3823                         lq_sta->lq.initial_rate_index[1],
3824                         lq_sta->lq.initial_rate_index[2],
3825                         lq_sta->lq.initial_rate_index[3]);
3826
3827         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3828                 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3829
3830                 desc += scnprintf(buff + desc, bufsz - desc,
3831                                   " rate[%d] 0x%X ", i, r);
3832                 desc += rs_pretty_print_rate_v1(buff + desc, bufsz - desc, r);
3833                 if (desc < bufsz - 1)
3834                         buff[desc++] = '\n';
3835         }
3836
3837         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3838         kfree(buff);
3839         return ret;
3840 }
3841
3842 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3843         .write = rs_sta_dbgfs_scale_table_write,
3844         .read = rs_sta_dbgfs_scale_table_read,
3845         .open = simple_open,
3846         .llseek = default_llseek,
3847 };
3848 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3849                         char __user *user_buf, size_t count, loff_t *ppos)
3850 {
3851         char *buff;
3852         int desc = 0;
3853         int i, j;
3854         ssize_t ret;
3855         struct iwl_scale_tbl_info *tbl;
3856         struct rs_rate *rate;
3857         struct iwl_lq_sta *lq_sta = file->private_data;
3858
3859         buff = kmalloc(1024, GFP_KERNEL);
3860         if (!buff)
3861                 return -ENOMEM;
3862
3863         for (i = 0; i < LQ_SIZE; i++) {
3864                 tbl = &(lq_sta->lq_info[i]);
3865                 rate = &tbl->rate;
3866                 desc += sprintf(buff+desc,
3867                                 "%s type=%d SGI=%d BW=%s DUP=0\n"
3868                                 "index=%d\n",
3869                                 lq_sta->active_tbl == i ? "*" : "x",
3870                                 rate->type,
3871                                 rate->sgi,
3872                                 is_ht20(rate) ? "20MHz" :
3873                                 is_ht40(rate) ? "40MHz" :
3874                                 is_ht80(rate) ? "80MHz" :
3875                                 is_ht160(rate) ? "160MHz" : "ERR",
3876                                 rate->index);
3877                 for (j = 0; j < IWL_RATE_COUNT; j++) {
3878                         desc += sprintf(buff+desc,
3879                                 "counter=%d success=%d %%=%d\n",
3880                                 tbl->win[j].counter,
3881                                 tbl->win[j].success_counter,
3882                                 tbl->win[j].success_ratio);
3883                 }
3884         }
3885         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3886         kfree(buff);
3887         return ret;
3888 }
3889
3890 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3891         .read = rs_sta_dbgfs_stats_table_read,
3892         .open = simple_open,
3893         .llseek = default_llseek,
3894 };
3895
3896 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3897                                               char __user *user_buf,
3898                                               size_t count, loff_t *ppos)
3899 {
3900         static const char * const column_name[] = {
3901                 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3902                 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3903                 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3904                 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3905                 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3906                 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3907                 [RS_COLUMN_MIMO2] = "MIMO2",
3908                 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3909         };
3910
3911         static const char * const rate_name[] = {
3912                 [IWL_RATE_1M_INDEX] = "1M",
3913                 [IWL_RATE_2M_INDEX] = "2M",
3914                 [IWL_RATE_5M_INDEX] = "5.5M",
3915                 [IWL_RATE_11M_INDEX] = "11M",
3916                 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3917                 [IWL_RATE_9M_INDEX] = "9M",
3918                 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3919                 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3920                 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3921                 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3922                 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3923                 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3924                 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3925                 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3926                 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3927                 [IWL_RATE_MCS_10_INDEX] = "MCS10",
3928                 [IWL_RATE_MCS_11_INDEX] = "MCS11",
3929         };
3930
3931         char *buff, *pos, *endpos;
3932         int col, rate;
3933         ssize_t ret;
3934         struct iwl_lq_sta *lq_sta = file->private_data;
3935         struct rs_rate_stats *stats;
3936         static const size_t bufsz = 1024;
3937
3938         buff = kmalloc(bufsz, GFP_KERNEL);
3939         if (!buff)
3940                 return -ENOMEM;
3941
3942         pos = buff;
3943         endpos = pos + bufsz;
3944
3945         pos += scnprintf(pos, endpos - pos, "COLUMN,");
3946         for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3947                 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3948         pos += scnprintf(pos, endpos - pos, "\n");
3949
3950         for (col = 0; col < RS_COLUMN_COUNT; col++) {
3951                 pos += scnprintf(pos, endpos - pos,
3952                                  "%s,", column_name[col]);
3953
3954                 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
3955                         stats = &(lq_sta->pers.tx_stats[col][rate]);
3956                         pos += scnprintf(pos, endpos - pos,
3957                                          "%llu/%llu,",
3958                                          stats->success,
3959                                          stats->total);
3960                 }
3961                 pos += scnprintf(pos, endpos - pos, "\n");
3962         }
3963
3964         ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3965         kfree(buff);
3966         return ret;
3967 }
3968
3969 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3970                                                const char __user *user_buf,
3971                                                size_t count, loff_t *ppos)
3972 {
3973         struct iwl_lq_sta *lq_sta = file->private_data;
3974         memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
3975
3976         return count;
3977 }
3978
3979 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
3980         .read = rs_sta_dbgfs_drv_tx_stats_read,
3981         .write = rs_sta_dbgfs_drv_tx_stats_write,
3982         .open = simple_open,
3983         .llseek = default_llseek,
3984 };
3985
3986 static ssize_t iwl_dbgfs_ss_force_read(struct file *file,
3987                                        char __user *user_buf,
3988                                        size_t count, loff_t *ppos)
3989 {
3990         struct iwl_lq_sta *lq_sta = file->private_data;
3991         char buf[12];
3992         int bufsz = sizeof(buf);
3993         int pos = 0;
3994         static const char * const ss_force_name[] = {
3995                 [RS_SS_FORCE_NONE] = "none",
3996                 [RS_SS_FORCE_STBC] = "stbc",
3997                 [RS_SS_FORCE_BFER] = "bfer",
3998                 [RS_SS_FORCE_SISO] = "siso",
3999         };
4000
4001         pos += scnprintf(buf+pos, bufsz-pos, "%s\n",
4002                          ss_force_name[lq_sta->pers.ss_force]);
4003         return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
4004 }
4005
4006 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf,
4007                                         size_t count, loff_t *ppos)
4008 {
4009         struct iwl_mvm *mvm = lq_sta->pers.drv;
4010         int ret = 0;
4011
4012         if (!strncmp("none", buf, 4)) {
4013                 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
4014         } else if (!strncmp("siso", buf, 4)) {
4015                 lq_sta->pers.ss_force = RS_SS_FORCE_SISO;
4016         } else if (!strncmp("stbc", buf, 4)) {
4017                 if (lq_sta->stbc_capable) {
4018                         lq_sta->pers.ss_force = RS_SS_FORCE_STBC;
4019                 } else {
4020                         IWL_ERR(mvm,
4021                                 "can't force STBC. peer doesn't support\n");
4022                         ret = -EINVAL;
4023                 }
4024         } else if (!strncmp("bfer", buf, 4)) {
4025                 if (lq_sta->bfer_capable) {
4026                         lq_sta->pers.ss_force = RS_SS_FORCE_BFER;
4027                 } else {
4028                         IWL_ERR(mvm,
4029                                 "can't force BFER. peer doesn't support\n");
4030                         ret = -EINVAL;
4031                 }
4032         } else {
4033                 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n");
4034                 ret = -EINVAL;
4035         }
4036         return ret ?: count;
4037 }
4038
4039 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
4040         _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta)
4041 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do {                \
4042                 debugfs_create_file(#name, mode, parent, lq_sta,        \
4043                                     &iwl_dbgfs_##name##_ops);           \
4044         } while (0)
4045
4046 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32);
4047
4048 static void rs_drv_add_sta_debugfs(void *mvm, void *priv_sta,
4049                                    struct dentry *dir)
4050 {
4051         struct iwl_lq_sta *lq_sta = priv_sta;
4052         struct iwl_mvm_sta *mvmsta;
4053
4054         mvmsta = container_of(lq_sta, struct iwl_mvm_sta,
4055                               deflink.lq_sta.rs_drv);
4056
4057         if (!mvmsta->vif)
4058                 return;
4059
4060         debugfs_create_file("rate_scale_table", 0600, dir,
4061                             lq_sta, &rs_sta_dbgfs_scale_table_ops);
4062         debugfs_create_file("rate_stats_table", 0400, dir,
4063                             lq_sta, &rs_sta_dbgfs_stats_table_ops);
4064         debugfs_create_file("drv_tx_stats", 0600, dir,
4065                             lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
4066         debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
4067                           &lq_sta->tx_agg_tid_en);
4068         debugfs_create_u8("reduced_tpc", 0600, dir,
4069                           &lq_sta->pers.dbg_fixed_txp_reduction);
4070
4071         MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, 0600);
4072 }
4073 #endif
4074
4075 /*
4076  * Initialization of rate scaling information is done by driver after
4077  * the station is added. Since mac80211 calls this function before a
4078  * station is added we ignore it.
4079  */
4080 static void rs_rate_init_ops(void *mvm_r,
4081                              struct ieee80211_supported_band *sband,
4082                              struct cfg80211_chan_def *chandef,
4083                              struct ieee80211_sta *sta, void *mvm_sta)
4084 {
4085 }
4086
4087 /* ops for rate scaling implemented in the driver */
4088 static const struct rate_control_ops rs_mvm_ops_drv = {
4089         .name = RS_NAME,
4090         .tx_status = rs_drv_mac80211_tx_status,
4091         .get_rate = rs_drv_get_rate,
4092         .rate_init = rs_rate_init_ops,
4093         .alloc = rs_alloc,
4094         .free = rs_free,
4095         .alloc_sta = rs_drv_alloc_sta,
4096         .free_sta = rs_free_sta,
4097         .rate_update = rs_drv_rate_update,
4098 #ifdef CONFIG_MAC80211_DEBUGFS
4099         .add_sta_debugfs = rs_drv_add_sta_debugfs,
4100 #endif
4101         .capa = RATE_CTRL_CAPA_VHT_EXT_NSS_BW,
4102 };
4103
4104 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm,
4105                           struct ieee80211_vif *vif,
4106                           struct ieee80211_sta *sta,
4107                           struct ieee80211_bss_conf *link_conf,
4108                           struct ieee80211_link_sta *link_sta,
4109                           enum nl80211_band band)
4110 {
4111         if (iwl_mvm_has_tlc_offload(mvm)) {
4112                 iwl_mvm_rs_fw_rate_init(mvm, vif, sta, link_conf,
4113                                         link_sta, band);
4114         } else {
4115                 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
4116
4117                 spin_lock(&mvmsta->deflink.lq_sta.rs_drv.pers.lock);
4118                 rs_drv_rate_init(mvm, sta, band);
4119                 spin_unlock(&mvmsta->deflink.lq_sta.rs_drv.pers.lock);
4120         }
4121 }
4122
4123 int iwl_mvm_rate_control_register(void)
4124 {
4125         return ieee80211_rate_control_register(&rs_mvm_ops_drv);
4126 }
4127
4128 void iwl_mvm_rate_control_unregister(void)
4129 {
4130         ieee80211_rate_control_unregister(&rs_mvm_ops_drv);
4131 }
4132
4133 static int rs_drv_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
4134                                 bool enable)
4135 {
4136         struct iwl_lq_cmd *lq = &mvmsta->deflink.lq_sta.rs_drv.lq;
4137
4138         lockdep_assert_held(&mvm->mutex);
4139
4140         if (enable) {
4141                 if (mvmsta->tx_protection == 0)
4142                         lq->flags |= LQ_FLAG_USE_RTS_MSK;
4143                 mvmsta->tx_protection++;
4144         } else {
4145                 mvmsta->tx_protection--;
4146                 if (mvmsta->tx_protection == 0)
4147                         lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
4148         }
4149
4150         return iwl_mvm_send_lq_cmd(mvm, lq);
4151 }
4152
4153 /**
4154  * iwl_mvm_tx_protection - ask FW to enable RTS/CTS protection
4155  * @mvm: The mvm component
4156  * @mvmsta: The station
4157  * @enable: Enable Tx protection?
4158  */
4159 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
4160                           bool enable)
4161 {
4162         if (iwl_mvm_has_tlc_offload(mvm))
4163                 return rs_fw_tx_protection(mvm, mvmsta, enable);
4164         else
4165                 return rs_drv_tx_protection(mvm, mvmsta, enable);
4166 }