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

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /******************************************************************************
   3  *
   4  * Copyright(c) 2005 - 2014, 2018 - 2023 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                 if (WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX))
1074                         rate->index = rs_ht_to_legacy[IWL_RATE_MCS_0_INDEX];
1075                 else if (WARN_ON_ONCE(rate->index > IWL_RATE_MCS_9_INDEX))
1076                         rate->index = rs_ht_to_legacy[IWL_RATE_MCS_9_INDEX];
1077                 else
1078                         rate->index = rs_ht_to_legacy[rate->index];
1079
1080                 rate->ldpc = false;
1081         } else {
1082                 /* Downgrade to SISO with same MCS if in MIMO  */
1083                 rate->type = is_vht_mimo2(rate) ?
1084                         LQ_VHT_SISO : LQ_HT_SISO;
1085         }
1086
1087         if (num_of_ant(rate->ant) > 1)
1088                 rate->ant = first_antenna(iwl_mvm_get_valid_tx_ant(mvm));
1089
1090         /* Relevant in both switching to SISO or Legacy */
1091         rate->sgi = false;
1092
1093         if (!rs_rate_supported(lq_sta, rate))
1094                 rs_get_lower_rate_in_column(lq_sta, rate);
1095 }
1096
1097 /* Check if both rates share the same column */
1098 static inline bool rs_rate_column_match(struct rs_rate *a,
1099                                         struct rs_rate *b)
1100 {
1101         bool ant_match;
1102
1103         if (a->stbc || a->bfer)
1104                 ant_match = (b->ant == ANT_A || b->ant == ANT_B);
1105         else
1106                 ant_match = (a->ant == b->ant);
1107
1108         return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi)
1109                 && ant_match;
1110 }
1111
1112 static inline enum rs_column rs_get_column_from_rate(struct rs_rate *rate)
1113 {
1114         if (is_legacy(rate)) {
1115                 if (rate->ant == ANT_A)
1116                         return RS_COLUMN_LEGACY_ANT_A;
1117
1118                 if (rate->ant == ANT_B)
1119                         return RS_COLUMN_LEGACY_ANT_B;
1120
1121                 goto err;
1122         }
1123
1124         if (is_siso(rate)) {
1125                 if (rate->ant == ANT_A || rate->stbc || rate->bfer)
1126                         return rate->sgi ? RS_COLUMN_SISO_ANT_A_SGI :
1127                                 RS_COLUMN_SISO_ANT_A;
1128
1129                 if (rate->ant == ANT_B)
1130                         return rate->sgi ? RS_COLUMN_SISO_ANT_B_SGI :
1131                                 RS_COLUMN_SISO_ANT_B;
1132
1133                 goto err;
1134         }
1135
1136         if (is_mimo(rate))
1137                 return rate->sgi ? RS_COLUMN_MIMO2_SGI : RS_COLUMN_MIMO2;
1138
1139 err:
1140         return RS_COLUMN_INVALID;
1141 }
1142
1143 static u8 rs_get_tid(struct ieee80211_hdr *hdr)
1144 {
1145         u8 tid = IWL_MAX_TID_COUNT;
1146
1147         if (ieee80211_is_data_qos(hdr->frame_control)) {
1148                 u8 *qc = ieee80211_get_qos_ctl(hdr);
1149                 tid = qc[0] & 0xf;
1150         }
1151
1152         if (unlikely(tid > IWL_MAX_TID_COUNT))
1153                 tid = IWL_MAX_TID_COUNT;
1154
1155         return tid;
1156 }
1157
1158 /*
1159  * mac80211 sends us Tx status
1160  */
1161 static void rs_drv_mac80211_tx_status(void *mvm_r,
1162                                       struct ieee80211_supported_band *sband,
1163                                       struct ieee80211_sta *sta, void *priv_sta,
1164                                       struct sk_buff *skb)
1165 {
1166         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1167         struct iwl_op_mode *op_mode = mvm_r;
1168         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1169         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1170         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1171
1172         if (!mvmsta->vif)
1173                 return;
1174
1175         if (!ieee80211_is_data(hdr->frame_control) ||
1176             info->flags & IEEE80211_TX_CTL_NO_ACK)
1177                 return;
1178
1179         iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info,
1180                              ieee80211_is_qos_nullfunc(hdr->frame_control));
1181 }
1182
1183 /*
1184  * Begin a period of staying with a selected modulation mode.
1185  * Set "stay_in_tbl" flag to prevent any mode switches.
1186  * Set frame tx success limits according to legacy vs. high-throughput,
1187  * and reset overall (spanning all rates) tx success history statistics.
1188  * These control how long we stay using same modulation mode before
1189  * searching for a new mode.
1190  */
1191 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1192                                  struct iwl_lq_sta *lq_sta)
1193 {
1194         IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1195         lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1196         if (is_legacy) {
1197                 lq_sta->table_count_limit = IWL_MVM_RS_LEGACY_TABLE_COUNT;
1198                 lq_sta->max_failure_limit = IWL_MVM_RS_LEGACY_FAILURE_LIMIT;
1199                 lq_sta->max_success_limit = IWL_MVM_RS_LEGACY_SUCCESS_LIMIT;
1200         } else {
1201                 lq_sta->table_count_limit = IWL_MVM_RS_NON_LEGACY_TABLE_COUNT;
1202                 lq_sta->max_failure_limit = IWL_MVM_RS_NON_LEGACY_FAILURE_LIMIT;
1203                 lq_sta->max_success_limit = IWL_MVM_RS_NON_LEGACY_SUCCESS_LIMIT;
1204         }
1205         lq_sta->table_count = 0;
1206         lq_sta->total_failed = 0;
1207         lq_sta->total_success = 0;
1208         lq_sta->flush_timer = jiffies;
1209         lq_sta->visited_columns = 0;
1210 }
1211
1212 static inline int rs_get_max_rate_from_mask(unsigned long rate_mask)
1213 {
1214         if (rate_mask)
1215                 return find_last_bit(&rate_mask, BITS_PER_LONG);
1216         return IWL_RATE_INVALID;
1217 }
1218
1219 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1220                                    const struct rs_tx_column *column)
1221 {
1222         switch (column->mode) {
1223         case RS_LEGACY:
1224                 return lq_sta->max_legacy_rate_idx;
1225         case RS_SISO:
1226                 return lq_sta->max_siso_rate_idx;
1227         case RS_MIMO2:
1228                 return lq_sta->max_mimo2_rate_idx;
1229         default:
1230                 WARN_ON_ONCE(1);
1231         }
1232
1233         return lq_sta->max_legacy_rate_idx;
1234 }
1235
1236 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1237                                             const struct rs_tx_column *column,
1238                                             u32 bw)
1239 {
1240         /* Used to choose among HT tables */
1241         const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1242
1243         if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1244                          column->mode != RS_SISO &&
1245                          column->mode != RS_MIMO2))
1246                 return expected_tpt_legacy;
1247
1248         /* Legacy rates have only one table */
1249         if (column->mode == RS_LEGACY)
1250                 return expected_tpt_legacy;
1251
1252         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1253         /* Choose among many HT tables depending on number of streams
1254          * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1255          * status */
1256         if (column->mode == RS_SISO) {
1257                 switch (bw) {
1258                 case RATE_MCS_CHAN_WIDTH_20:
1259                         ht_tbl_pointer = expected_tpt_siso_20MHz;
1260                         break;
1261                 case RATE_MCS_CHAN_WIDTH_40:
1262                         ht_tbl_pointer = expected_tpt_siso_40MHz;
1263                         break;
1264                 case RATE_MCS_CHAN_WIDTH_80:
1265                         ht_tbl_pointer = expected_tpt_siso_80MHz;
1266                         break;
1267                 case RATE_MCS_CHAN_WIDTH_160:
1268                         ht_tbl_pointer = expected_tpt_siso_160MHz;
1269                         break;
1270                 default:
1271                         WARN_ON_ONCE(1);
1272                 }
1273         } else if (column->mode == RS_MIMO2) {
1274                 switch (bw) {
1275                 case RATE_MCS_CHAN_WIDTH_20:
1276                         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1277                         break;
1278                 case RATE_MCS_CHAN_WIDTH_40:
1279                         ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1280                         break;
1281                 case RATE_MCS_CHAN_WIDTH_80:
1282                         ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1283                         break;
1284                 case RATE_MCS_CHAN_WIDTH_160:
1285                         ht_tbl_pointer = expected_tpt_mimo2_160MHz;
1286                         break;
1287                 default:
1288                         WARN_ON_ONCE(1);
1289                 }
1290         } else {
1291                 WARN_ON_ONCE(1);
1292         }
1293
1294         if (!column->sgi && !lq_sta->is_agg)            /* Normal */
1295                 return ht_tbl_pointer[0];
1296         else if (column->sgi && !lq_sta->is_agg)        /* SGI */
1297                 return ht_tbl_pointer[1];
1298         else if (!column->sgi && lq_sta->is_agg)        /* AGG */
1299                 return ht_tbl_pointer[2];
1300         else                                            /* AGG+SGI */
1301                 return ht_tbl_pointer[3];
1302 }
1303
1304 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1305                                       struct iwl_scale_tbl_info *tbl)
1306 {
1307         struct rs_rate *rate = &tbl->rate;
1308         const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1309
1310         tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1311 }
1312
1313 /* rs uses two tables, one is active and the second is for searching better
1314  * configuration. This function, according to the index of the currently
1315  * active table returns the search table, which is located at the
1316  * index complementary to 1 according to the active table (active = 1,
1317  * search = 0 or active = 0, search = 1).
1318  * Since lq_info is an arary of size 2, make sure index cannot be out of bounds.
1319  */
1320 static inline u8 rs_search_tbl(u8 active_tbl)
1321 {
1322         return (active_tbl ^ 1) & 1;
1323 }
1324
1325 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1326                             struct iwl_lq_sta *lq_sta,
1327                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1328                             unsigned long rate_mask, s8 index)
1329 {
1330         struct iwl_scale_tbl_info *active_tbl =
1331             &(lq_sta->lq_info[lq_sta->active_tbl]);
1332         s32 success_ratio = active_tbl->win[index].success_ratio;
1333         u16 expected_current_tpt = active_tbl->expected_tpt[index];
1334         const u16 *tpt_tbl = tbl->expected_tpt;
1335         u16 high_low;
1336         u32 target_tpt;
1337         int rate_idx;
1338
1339         if (success_ratio >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1340                 target_tpt = 100 * expected_current_tpt;
1341                 IWL_DEBUG_RATE(mvm,
1342                                "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1343                                success_ratio, target_tpt);
1344         } else {
1345                 target_tpt = lq_sta->last_tpt;
1346                 IWL_DEBUG_RATE(mvm,
1347                                "SR %d not that good. Find rate exceeding ACTUAL_TPT %d\n",
1348                                success_ratio, target_tpt);
1349         }
1350
1351         rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
1352
1353         while (rate_idx != IWL_RATE_INVALID) {
1354                 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1355                         break;
1356
1357                 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1358                                                 tbl->rate.type);
1359
1360                 rate_idx = (high_low >> 8) & 0xff;
1361         }
1362
1363         IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1364                        rate_idx, target_tpt,
1365                        rate_idx != IWL_RATE_INVALID ?
1366                        100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1367
1368         return rate_idx;
1369 }
1370
1371 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1372 {
1373         struct ieee80211_sta_vht_cap *sta_vht_cap = &sta->deflink.vht_cap;
1374         struct ieee80211_vht_cap vht_cap = {
1375                 .vht_cap_info = cpu_to_le32(sta_vht_cap->cap),
1376                 .supp_mcs = sta_vht_cap->vht_mcs,
1377         };
1378
1379         switch (sta->deflink.bandwidth) {
1380         case IEEE80211_STA_RX_BW_160:
1381                 /*
1382                  * Don't use 160 MHz if VHT extended NSS support
1383                  * says we cannot use 2 streams, we don't want to
1384                  * deal with this.
1385                  * We only check MCS 0 - they will support that if
1386                  * we got here at all and we don't care which MCS,
1387                  * we want to determine a more global state.
1388                  */
1389                 if (ieee80211_get_vht_max_nss(&vht_cap,
1390                                               IEEE80211_VHT_CHANWIDTH_160MHZ,
1391                                               0, true,
1392                                               sta->deflink.rx_nss) < sta->deflink.rx_nss)
1393                         return RATE_MCS_CHAN_WIDTH_80;
1394                 return RATE_MCS_CHAN_WIDTH_160;
1395         case IEEE80211_STA_RX_BW_80:
1396                 return RATE_MCS_CHAN_WIDTH_80;
1397         case IEEE80211_STA_RX_BW_40:
1398                 return RATE_MCS_CHAN_WIDTH_40;
1399         case IEEE80211_STA_RX_BW_20:
1400         default:
1401                 return RATE_MCS_CHAN_WIDTH_20;
1402         }
1403 }
1404
1405 /*
1406  * Check whether we should continue using same modulation mode, or
1407  * begin search for a new mode, based on:
1408  * 1) # tx successes or failures while using this mode
1409  * 2) # times calling this function
1410  * 3) elapsed time in this mode (not used, for now)
1411  */
1412 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1413 {
1414         struct iwl_scale_tbl_info *tbl;
1415         int active_tbl;
1416         int flush_interval_passed = 0;
1417         struct iwl_mvm *mvm;
1418
1419         mvm = lq_sta->pers.drv;
1420         active_tbl = lq_sta->active_tbl;
1421
1422         tbl = &(lq_sta->lq_info[active_tbl]);
1423
1424         /* If we've been disallowing search, see if we should now allow it */
1425         if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1426                 /* Elapsed time using current modulation mode */
1427                 if (lq_sta->flush_timer)
1428                         flush_interval_passed =
1429                                 time_after(jiffies,
1430                                            (unsigned long)(lq_sta->flush_timer +
1431                                                            (IWL_MVM_RS_STAY_IN_COLUMN_TIMEOUT * HZ)));
1432
1433                 /*
1434                  * Check if we should allow search for new modulation mode.
1435                  * If many frames have failed or succeeded, or we've used
1436                  * this same modulation for a long time, allow search, and
1437                  * reset history stats that keep track of whether we should
1438                  * allow a new search.  Also (below) reset all bitmaps and
1439                  * stats in active history.
1440                  */
1441                 if (force_search ||
1442                     (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1443                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1444                     ((!lq_sta->search_better_tbl) &&
1445                      (lq_sta->flush_timer) && (flush_interval_passed))) {
1446                         IWL_DEBUG_RATE(mvm,
1447                                        "LQ: stay is expired %d %d %d\n",
1448                                      lq_sta->total_failed,
1449                                      lq_sta->total_success,
1450                                      flush_interval_passed);
1451
1452                         /* Allow search for new mode */
1453                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1454                         IWL_DEBUG_RATE(mvm,
1455                                        "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1456                         lq_sta->total_failed = 0;
1457                         lq_sta->total_success = 0;
1458                         lq_sta->flush_timer = 0;
1459                         /* mark the current column as visited */
1460                         lq_sta->visited_columns = BIT(tbl->column);
1461                 /*
1462                  * Else if we've used this modulation mode enough repetitions
1463                  * (regardless of elapsed time or success/failure), reset
1464                  * history bitmaps and rate-specific stats for all rates in
1465                  * active table.
1466                  */
1467                 } else {
1468                         lq_sta->table_count++;
1469                         if (lq_sta->table_count >=
1470                             lq_sta->table_count_limit) {
1471                                 lq_sta->table_count = 0;
1472
1473                                 IWL_DEBUG_RATE(mvm,
1474                                                "LQ: stay in table clear win\n");
1475                                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1476                         }
1477                 }
1478
1479                 /* If transitioning to allow "search", reset all history
1480                  * bitmaps and stats in active table (this will become the new
1481                  * "search" table). */
1482                 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1483                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
1484                 }
1485         }
1486 }
1487
1488 static void rs_set_amsdu_len(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1489                              struct iwl_scale_tbl_info *tbl,
1490                              enum rs_action scale_action)
1491 {
1492         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1493         struct ieee80211_bss_conf *bss_conf = &mvmsta->vif->bss_conf;
1494         int i;
1495
1496         sta->deflink.agg.max_amsdu_len =
1497                 rs_fw_get_max_amsdu_len(sta, bss_conf, &sta->deflink);
1498
1499         /*
1500          * In case TLC offload is not active amsdu_enabled is either 0xFFFF
1501          * or 0, since there is no per-TID alg.
1502          */
1503         if ((!is_vht(&tbl->rate) && !is_ht(&tbl->rate)) ||
1504             tbl->rate.index < IWL_RATE_MCS_5_INDEX ||
1505             scale_action == RS_ACTION_DOWNSCALE)
1506                 mvmsta->amsdu_enabled = 0;
1507         else
1508                 mvmsta->amsdu_enabled = 0xFFFF;
1509
1510         if (bss_conf->he_support &&
1511             !iwlwifi_mod_params.disable_11ax)
1512                 mvmsta->max_amsdu_len = sta->deflink.agg.max_amsdu_len;
1513         else
1514                 mvmsta->max_amsdu_len =
1515                         min_t(int, sta->deflink.agg.max_amsdu_len, 8500);
1516
1517         sta->deflink.agg.max_rc_amsdu_len = mvmsta->max_amsdu_len;
1518
1519         for (i = 0; i < IWL_MAX_TID_COUNT; i++) {
1520                 if (mvmsta->amsdu_enabled)
1521                         sta->deflink.agg.max_tid_amsdu_len[i] =
1522                                 iwl_mvm_max_amsdu_size(mvm, sta, i);
1523                 else
1524                         /*
1525                          * Not so elegant, but this will effectively
1526                          * prevent AMSDU on this TID
1527                          */
1528                         sta->deflink.agg.max_tid_amsdu_len[i] = 1;
1529         }
1530 }
1531
1532 /*
1533  * setup rate table in uCode
1534  */
1535 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1536                                struct ieee80211_sta *sta,
1537                                struct iwl_lq_sta *lq_sta,
1538                                struct iwl_scale_tbl_info *tbl)
1539 {
1540         rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
1541         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq);
1542 }
1543
1544 static bool rs_tweak_rate_tbl(struct iwl_mvm *mvm,
1545                               struct ieee80211_sta *sta,
1546                               struct iwl_lq_sta *lq_sta,
1547                               struct iwl_scale_tbl_info *tbl,
1548                               enum rs_action scale_action)
1549 {
1550         if (rs_bw_from_sta_bw(sta) != RATE_MCS_CHAN_WIDTH_80)
1551                 return false;
1552
1553         if (!is_vht_siso(&tbl->rate))
1554                 return false;
1555
1556         if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_80) &&
1557             (tbl->rate.index == IWL_RATE_MCS_0_INDEX) &&
1558             (scale_action == RS_ACTION_DOWNSCALE)) {
1559                 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_20;
1560                 tbl->rate.index = IWL_RATE_MCS_4_INDEX;
1561                 IWL_DEBUG_RATE(mvm, "Switch 80Mhz SISO MCS0 -> 20Mhz MCS4\n");
1562                 goto tweaked;
1563         }
1564
1565         /* Go back to 80Mhz MCS1 only if we've established that 20Mhz MCS5 is
1566          * sustainable, i.e. we're past the test window. We can't go back
1567          * if MCS5 is just tested as this will happen always after switching
1568          * to 20Mhz MCS4 because the rate stats are cleared.
1569          */
1570         if ((tbl->rate.bw == RATE_MCS_CHAN_WIDTH_20) &&
1571             (((tbl->rate.index == IWL_RATE_MCS_5_INDEX) &&
1572              (scale_action == RS_ACTION_STAY)) ||
1573              ((tbl->rate.index > IWL_RATE_MCS_5_INDEX) &&
1574               (scale_action == RS_ACTION_UPSCALE)))) {
1575                 tbl->rate.bw = RATE_MCS_CHAN_WIDTH_80;
1576                 tbl->rate.index = IWL_RATE_MCS_1_INDEX;
1577                 IWL_DEBUG_RATE(mvm, "Switch 20Mhz SISO MCS5 -> 80Mhz MCS1\n");
1578                 goto tweaked;
1579         }
1580
1581         return false;
1582
1583 tweaked:
1584         rs_set_expected_tpt_table(lq_sta, tbl);
1585         rs_rate_scale_clear_tbl_windows(mvm, tbl);
1586         return true;
1587 }
1588
1589 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1590                                          struct iwl_lq_sta *lq_sta,
1591                                          struct ieee80211_sta *sta,
1592                                          struct iwl_scale_tbl_info *tbl)
1593 {
1594         int i, j, max_rate;
1595         enum rs_column next_col_id;
1596         const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1597         const struct rs_tx_column *next_col;
1598         allow_column_func_t allow_func;
1599         u8 valid_ants = iwl_mvm_get_valid_tx_ant(mvm);
1600         const u16 *expected_tpt_tbl;
1601         u16 tpt, max_expected_tpt;
1602
1603         for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1604                 next_col_id = curr_col->next_columns[i];
1605
1606                 if (next_col_id == RS_COLUMN_INVALID)
1607                         continue;
1608
1609                 if (lq_sta->visited_columns & BIT(next_col_id)) {
1610                         IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1611                                        next_col_id);
1612                         continue;
1613                 }
1614
1615                 next_col = &rs_tx_columns[next_col_id];
1616
1617                 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1618                         IWL_DEBUG_RATE(mvm,
1619                                        "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1620                                        next_col_id, valid_ants, next_col->ant);
1621                         continue;
1622                 }
1623
1624                 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1625                         allow_func = next_col->checks[j];
1626                         if (allow_func && !allow_func(mvm, sta, &tbl->rate,
1627                                                       next_col))
1628                                 break;
1629                 }
1630
1631                 if (j != MAX_COLUMN_CHECKS) {
1632                         IWL_DEBUG_RATE(mvm,
1633                                        "Skip column %d: not allowed (check %d failed)\n",
1634                                        next_col_id, j);
1635
1636                         continue;
1637                 }
1638
1639                 tpt = lq_sta->last_tpt / 100;
1640                 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1641                                                      rs_bw_from_sta_bw(sta));
1642                 if (WARN_ON_ONCE(!expected_tpt_tbl))
1643                         continue;
1644
1645                 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1646                 if (max_rate == IWL_RATE_INVALID) {
1647                         IWL_DEBUG_RATE(mvm,
1648                                        "Skip column %d: no rate is allowed in this column\n",
1649                                        next_col_id);
1650                         continue;
1651                 }
1652
1653                 max_expected_tpt = expected_tpt_tbl[max_rate];
1654                 if (tpt >= max_expected_tpt) {
1655                         IWL_DEBUG_RATE(mvm,
1656                                        "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1657                                        next_col_id, max_expected_tpt, tpt);
1658                         continue;
1659                 }
1660
1661                 IWL_DEBUG_RATE(mvm,
1662                                "Found potential column %d. Max expected %d current %d\n",
1663                                next_col_id, max_expected_tpt, tpt);
1664                 break;
1665         }
1666
1667         if (i == MAX_NEXT_COLUMNS)
1668                 return RS_COLUMN_INVALID;
1669
1670         return next_col_id;
1671 }
1672
1673 static int rs_switch_to_column(struct iwl_mvm *mvm,
1674                                struct iwl_lq_sta *lq_sta,
1675                                struct ieee80211_sta *sta,
1676                                enum rs_column col_id)
1677 {
1678         struct iwl_scale_tbl_info *tbl = &lq_sta->lq_info[lq_sta->active_tbl];
1679         struct iwl_scale_tbl_info *search_tbl =
1680                 &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
1681         struct rs_rate *rate = &search_tbl->rate;
1682         const struct rs_tx_column *column = &rs_tx_columns[col_id];
1683         const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1684         unsigned long rate_mask = 0;
1685         u32 rate_idx = 0;
1686
1687         memcpy(search_tbl, tbl, offsetof(struct iwl_scale_tbl_info, win));
1688
1689         rate->sgi = column->sgi;
1690         rate->ant = column->ant;
1691
1692         if (column->mode == RS_LEGACY) {
1693                 if (lq_sta->band == NL80211_BAND_5GHZ)
1694                         rate->type = LQ_LEGACY_A;
1695                 else
1696                         rate->type = LQ_LEGACY_G;
1697
1698                 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1699                 rate->ldpc = false;
1700                 rate_mask = lq_sta->active_legacy_rate;
1701         } else if (column->mode == RS_SISO) {
1702                 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1703                 rate_mask = lq_sta->active_siso_rate;
1704         } else if (column->mode == RS_MIMO2) {
1705                 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1706                 rate_mask = lq_sta->active_mimo2_rate;
1707         } else {
1708                 WARN_ONCE(1, "Bad column mode");
1709         }
1710
1711         if (column->mode != RS_LEGACY) {
1712                 rate->bw = rs_bw_from_sta_bw(sta);
1713                 rate->ldpc = lq_sta->ldpc;
1714         }
1715
1716         search_tbl->column = col_id;
1717         rs_set_expected_tpt_table(lq_sta, search_tbl);
1718
1719         lq_sta->visited_columns |= BIT(col_id);
1720
1721         /* Get the best matching rate if we're changing modes. e.g.
1722          * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1723          */
1724         if (curr_column->mode != column->mode) {
1725                 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1726                                             rate_mask, rate->index);
1727
1728                 if ((rate_idx == IWL_RATE_INVALID) ||
1729                     !(BIT(rate_idx) & rate_mask)) {
1730                         IWL_DEBUG_RATE(mvm,
1731                                        "can not switch with index %d"
1732                                        " rate mask %lx\n",
1733                                        rate_idx, rate_mask);
1734
1735                         goto err;
1736                 }
1737
1738                 rate->index = rate_idx;
1739         }
1740
1741         IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1742                        col_id, rate->index);
1743
1744         return 0;
1745
1746 err:
1747         rate->type = LQ_NONE;
1748         return -1;
1749 }
1750
1751 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1752                                          struct iwl_scale_tbl_info *tbl,
1753                                          s32 sr, int low, int high,
1754                                          int current_tpt,
1755                                          int low_tpt, int high_tpt)
1756 {
1757         enum rs_action action = RS_ACTION_STAY;
1758
1759         if ((sr <= RS_PERCENT(IWL_MVM_RS_SR_FORCE_DECREASE)) ||
1760             (current_tpt == 0)) {
1761                 IWL_DEBUG_RATE(mvm,
1762                                "Decrease rate because of low SR\n");
1763                 return RS_ACTION_DOWNSCALE;
1764         }
1765
1766         if ((low_tpt == IWL_INVALID_VALUE) &&
1767             (high_tpt == IWL_INVALID_VALUE) &&
1768             (high != IWL_RATE_INVALID)) {
1769                 IWL_DEBUG_RATE(mvm,
1770                                "No data about high/low rates. Increase rate\n");
1771                 return RS_ACTION_UPSCALE;
1772         }
1773
1774         if ((high_tpt == IWL_INVALID_VALUE) &&
1775             (high != IWL_RATE_INVALID) &&
1776             (low_tpt != IWL_INVALID_VALUE) &&
1777             (low_tpt < current_tpt)) {
1778                 IWL_DEBUG_RATE(mvm,
1779                                "No data about high rate and low rate is worse. Increase rate\n");
1780                 return RS_ACTION_UPSCALE;
1781         }
1782
1783         if ((high_tpt != IWL_INVALID_VALUE) &&
1784             (high_tpt > current_tpt)) {
1785                 IWL_DEBUG_RATE(mvm,
1786                                "Higher rate is better. Increate rate\n");
1787                 return RS_ACTION_UPSCALE;
1788         }
1789
1790         if ((low_tpt != IWL_INVALID_VALUE) &&
1791             (high_tpt != IWL_INVALID_VALUE) &&
1792             (low_tpt < current_tpt) &&
1793             (high_tpt < current_tpt)) {
1794                 IWL_DEBUG_RATE(mvm,
1795                                "Both high and low are worse. Maintain rate\n");
1796                 return RS_ACTION_STAY;
1797         }
1798
1799         if ((low_tpt != IWL_INVALID_VALUE) &&
1800             (low_tpt > current_tpt)) {
1801                 IWL_DEBUG_RATE(mvm,
1802                                "Lower rate is better\n");
1803                 action = RS_ACTION_DOWNSCALE;
1804                 goto out;
1805         }
1806
1807         if ((low_tpt == IWL_INVALID_VALUE) &&
1808             (low != IWL_RATE_INVALID)) {
1809                 IWL_DEBUG_RATE(mvm,
1810                                "No data about lower rate\n");
1811                 action = RS_ACTION_DOWNSCALE;
1812                 goto out;
1813         }
1814
1815         IWL_DEBUG_RATE(mvm, "Maintain rate\n");
1816
1817 out:
1818         if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
1819                 if (sr >= RS_PERCENT(IWL_MVM_RS_SR_NO_DECREASE)) {
1820                         IWL_DEBUG_RATE(mvm,
1821                                        "SR is above NO DECREASE. Avoid downscale\n");
1822                         action = RS_ACTION_STAY;
1823                 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
1824                         IWL_DEBUG_RATE(mvm,
1825                                        "Current TPT is higher than max expected in low rate. Avoid downscale\n");
1826                         action = RS_ACTION_STAY;
1827                 } else {
1828                         IWL_DEBUG_RATE(mvm, "Decrease rate\n");
1829                 }
1830         }
1831
1832         return action;
1833 }
1834
1835 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1836                           struct iwl_lq_sta *lq_sta)
1837 {
1838         /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
1839          * supports STBC of at least 1*SS
1840          */
1841         if (!lq_sta->stbc_capable)
1842                 return false;
1843
1844         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
1845                 return false;
1846
1847         return true;
1848 }
1849
1850 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
1851                                 int *weaker, int *stronger)
1852 {
1853         *weaker = index + IWL_MVM_RS_TPC_TX_POWER_STEP;
1854         if (*weaker > TPC_MAX_REDUCTION)
1855                 *weaker = TPC_INVALID;
1856
1857         *stronger = index - IWL_MVM_RS_TPC_TX_POWER_STEP;
1858         if (*stronger < 0)
1859                 *stronger = TPC_INVALID;
1860 }
1861
1862 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1863                            struct rs_rate *rate, enum nl80211_band band)
1864 {
1865         int index = rate->index;
1866         bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
1867         bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
1868                                 !vif->cfg.ps);
1869
1870         IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
1871                        cam, sta_ps_disabled);
1872         /*
1873          * allow tpc only if power management is enabled, or bt coex
1874          * activity grade allows it and we are on 2.4Ghz.
1875          */
1876         if ((cam || sta_ps_disabled) &&
1877             !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
1878                 return false;
1879
1880         IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
1881         if (is_legacy(rate))
1882                 return index == IWL_RATE_54M_INDEX;
1883         if (is_ht(rate))
1884                 return index == IWL_RATE_MCS_7_INDEX;
1885         if (is_vht(rate))
1886                 return index == IWL_RATE_MCS_9_INDEX;
1887
1888         WARN_ON_ONCE(1);
1889         return false;
1890 }
1891
1892 enum tpc_action {
1893         TPC_ACTION_STAY,
1894         TPC_ACTION_DECREASE,
1895         TPC_ACTION_INCREASE,
1896         TPC_ACTION_NO_RESTIRCTION,
1897 };
1898
1899 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
1900                                          s32 sr, int weak, int strong,
1901                                          int current_tpt,
1902                                          int weak_tpt, int strong_tpt)
1903 {
1904         /* stay until we have valid tpt */
1905         if (current_tpt == IWL_INVALID_VALUE) {
1906                 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
1907                 return TPC_ACTION_STAY;
1908         }
1909
1910         /* Too many failures, increase txp */
1911         if (sr <= RS_PERCENT(IWL_MVM_RS_TPC_SR_FORCE_INCREASE) ||
1912             current_tpt == 0) {
1913                 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
1914                 return TPC_ACTION_NO_RESTIRCTION;
1915         }
1916
1917         /* try decreasing first if applicable */
1918         if (sr >= RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
1919             weak != TPC_INVALID) {
1920                 if (weak_tpt == IWL_INVALID_VALUE &&
1921                     (strong_tpt == IWL_INVALID_VALUE ||
1922                      current_tpt >= strong_tpt)) {
1923                         IWL_DEBUG_RATE(mvm,
1924                                        "no weak txp measurement. decrease txp\n");
1925                         return TPC_ACTION_DECREASE;
1926                 }
1927
1928                 if (weak_tpt > current_tpt) {
1929                         IWL_DEBUG_RATE(mvm,
1930                                        "lower txp has better tpt. decrease txp\n");
1931                         return TPC_ACTION_DECREASE;
1932                 }
1933         }
1934
1935         /* next, increase if needed */
1936         if (sr < RS_PERCENT(IWL_MVM_RS_TPC_SR_NO_INCREASE) &&
1937             strong != TPC_INVALID) {
1938                 if (weak_tpt == IWL_INVALID_VALUE &&
1939                     strong_tpt != IWL_INVALID_VALUE &&
1940                     current_tpt < strong_tpt) {
1941                         IWL_DEBUG_RATE(mvm,
1942                                        "higher txp has better tpt. increase txp\n");
1943                         return TPC_ACTION_INCREASE;
1944                 }
1945
1946                 if (weak_tpt < current_tpt &&
1947                     (strong_tpt == IWL_INVALID_VALUE ||
1948                      strong_tpt > current_tpt)) {
1949                         IWL_DEBUG_RATE(mvm,
1950                                        "lower txp has worse tpt. increase txp\n");
1951                         return TPC_ACTION_INCREASE;
1952                 }
1953         }
1954
1955         IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
1956         return TPC_ACTION_STAY;
1957 }
1958
1959 static bool rs_tpc_perform(struct iwl_mvm *mvm,
1960                            struct ieee80211_sta *sta,
1961                            struct iwl_lq_sta *lq_sta,
1962                            struct iwl_scale_tbl_info *tbl)
1963 {
1964         struct iwl_mvm_sta *mvm_sta = iwl_mvm_sta_from_mac80211(sta);
1965         struct ieee80211_vif *vif = mvm_sta->vif;
1966         struct ieee80211_chanctx_conf *chanctx_conf;
1967         enum nl80211_band band;
1968         struct iwl_rate_scale_data *window;
1969         struct rs_rate *rate = &tbl->rate;
1970         enum tpc_action action;
1971         s32 sr;
1972         u8 cur = lq_sta->lq.reduced_tpc;
1973         int current_tpt;
1974         int weak, strong;
1975         int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
1976
1977 #ifdef CONFIG_MAC80211_DEBUGFS
1978         if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
1979                 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
1980                                lq_sta->pers.dbg_fixed_txp_reduction);
1981                 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
1982                 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
1983         }
1984 #endif
1985
1986         rcu_read_lock();
1987         chanctx_conf = rcu_dereference(vif->bss_conf.chanctx_conf);
1988         if (WARN_ON(!chanctx_conf))
1989                 band = NUM_NL80211_BANDS;
1990         else
1991                 band = chanctx_conf->def.chan->band;
1992         rcu_read_unlock();
1993
1994         if (!rs_tpc_allowed(mvm, vif, rate, band)) {
1995                 IWL_DEBUG_RATE(mvm,
1996                                "tpc is not allowed. remove txp restrictions\n");
1997                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
1998                 return cur != TPC_NO_REDUCTION;
1999         }
2000
2001         rs_get_adjacent_txp(mvm, cur, &weak, &strong);
2002
2003         /* Collect measured throughputs for current and adjacent rates */
2004         window = tbl->tpc_win;
2005         sr = window[cur].success_ratio;
2006         current_tpt = window[cur].average_tpt;
2007         if (weak != TPC_INVALID)
2008                 weak_tpt = window[weak].average_tpt;
2009         if (strong != TPC_INVALID)
2010                 strong_tpt = window[strong].average_tpt;
2011
2012         IWL_DEBUG_RATE(mvm,
2013                        "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
2014                        cur, current_tpt, sr, weak, strong,
2015                        weak_tpt, strong_tpt);
2016
2017         action = rs_get_tpc_action(mvm, sr, weak, strong,
2018                                    current_tpt, weak_tpt, strong_tpt);
2019
2020         /* override actions if we are on the edge */
2021         if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
2022                 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
2023                 action = TPC_ACTION_STAY;
2024         } else if (strong == TPC_INVALID &&
2025                    (action == TPC_ACTION_INCREASE ||
2026                     action == TPC_ACTION_NO_RESTIRCTION)) {
2027                 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
2028                 action = TPC_ACTION_STAY;
2029         }
2030
2031         switch (action) {
2032         case TPC_ACTION_DECREASE:
2033                 lq_sta->lq.reduced_tpc = weak;
2034                 return true;
2035         case TPC_ACTION_INCREASE:
2036                 lq_sta->lq.reduced_tpc = strong;
2037                 return true;
2038         case TPC_ACTION_NO_RESTIRCTION:
2039                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
2040                 return true;
2041         case TPC_ACTION_STAY:
2042                 /* do nothing */
2043                 break;
2044         }
2045         return false;
2046 }
2047
2048 /*
2049  * Do rate scaling and search for new modulation mode.
2050  */
2051 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2052                                   struct ieee80211_sta *sta,
2053                                   struct iwl_lq_sta *lq_sta,
2054                                   int tid, bool ndp)
2055 {
2056         int low = IWL_RATE_INVALID;
2057         int high = IWL_RATE_INVALID;
2058         int index;
2059         struct iwl_rate_scale_data *window = NULL;
2060         int current_tpt = IWL_INVALID_VALUE;
2061         int low_tpt = IWL_INVALID_VALUE;
2062         int high_tpt = IWL_INVALID_VALUE;
2063         u32 fail_count;
2064         enum rs_action scale_action = RS_ACTION_STAY;
2065         u16 rate_mask;
2066         u8 update_lq = 0;
2067         struct iwl_scale_tbl_info *tbl, *tbl1;
2068         u8 active_tbl = 0;
2069         u8 done_search = 0;
2070         u16 high_low;
2071         s32 sr;
2072         u8 prev_agg = lq_sta->is_agg;
2073         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2074         struct rs_rate *rate;
2075
2076         lq_sta->is_agg = !!mvmsta->agg_tids;
2077
2078         /*
2079          * Select rate-scale / modulation-mode table to work with in
2080          * the rest of this function:  "search" if searching for better
2081          * modulation mode, or "active" if doing rate scaling within a mode.
2082          */
2083         if (!lq_sta->search_better_tbl)
2084                 active_tbl = lq_sta->active_tbl;
2085         else
2086                 active_tbl = rs_search_tbl(lq_sta->active_tbl);
2087
2088         tbl = &(lq_sta->lq_info[active_tbl]);
2089         rate = &tbl->rate;
2090
2091         if (prev_agg != lq_sta->is_agg) {
2092                 IWL_DEBUG_RATE(mvm,
2093                                "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2094                                prev_agg, lq_sta->is_agg);
2095                 rs_set_expected_tpt_table(lq_sta, tbl);
2096                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2097         }
2098
2099         /* current tx rate */
2100         index = rate->index;
2101
2102         /* rates available for this association, and for modulation mode */
2103         rate_mask = rs_get_supported_rates(lq_sta, rate);
2104
2105         if (!(BIT(index) & rate_mask)) {
2106                 IWL_ERR(mvm, "Current Rate is not valid\n");
2107                 if (lq_sta->search_better_tbl) {
2108                         /* revert to active table if search table is not valid*/
2109                         rate->type = LQ_NONE;
2110                         lq_sta->search_better_tbl = 0;
2111                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2112                         rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2113                 }
2114                 return;
2115         }
2116
2117         /* Get expected throughput table and history window for current rate */
2118         if (!tbl->expected_tpt) {
2119                 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2120                 return;
2121         }
2122
2123         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2124         window = &(tbl->win[index]);
2125
2126         /*
2127          * If there is not enough history to calculate actual average
2128          * throughput, keep analyzing results of more tx frames, without
2129          * changing rate or mode (bypass most of the rest of this function).
2130          * Set up new rate table in uCode only if old rate is not supported
2131          * in current association (use new rate found above).
2132          */
2133         fail_count = window->counter - window->success_counter;
2134         if ((fail_count < IWL_MVM_RS_RATE_MIN_FAILURE_TH) &&
2135             (window->success_counter < IWL_MVM_RS_RATE_MIN_SUCCESS_TH)) {
2136                 IWL_DEBUG_RATE(mvm,
2137                                "%s: Test Window: succ %d total %d\n",
2138                                rs_pretty_rate(rate),
2139                                window->success_counter, window->counter);
2140
2141                 /* Can't calculate this yet; not enough history */
2142                 window->average_tpt = IWL_INVALID_VALUE;
2143
2144                 /* Should we stay with this modulation mode,
2145                  * or search for a new one? */
2146                 rs_stay_in_table(lq_sta, false);
2147
2148                 return;
2149         }
2150
2151         /* If we are searching for better modulation mode, check success. */
2152         if (lq_sta->search_better_tbl) {
2153                 /* If good success, continue using the "search" mode;
2154                  * no need to send new link quality command, since we're
2155                  * continuing to use the setup that we've been trying. */
2156                 if (window->average_tpt > lq_sta->last_tpt) {
2157                         IWL_DEBUG_RATE(mvm,
2158                                        "SWITCHING TO NEW TABLE SR: %d "
2159                                        "cur-tpt %d old-tpt %d\n",
2160                                        window->success_ratio,
2161                                        window->average_tpt,
2162                                        lq_sta->last_tpt);
2163
2164                         /* Swap tables; "search" becomes "active" */
2165                         lq_sta->active_tbl = active_tbl;
2166                         current_tpt = window->average_tpt;
2167                 /* Else poor success; go back to mode in "active" table */
2168                 } else {
2169                         IWL_DEBUG_RATE(mvm,
2170                                        "GOING BACK TO THE OLD TABLE: SR %d "
2171                                        "cur-tpt %d old-tpt %d\n",
2172                                        window->success_ratio,
2173                                        window->average_tpt,
2174                                        lq_sta->last_tpt);
2175
2176                         /* Nullify "search" table */
2177                         rate->type = LQ_NONE;
2178
2179                         /* Revert to "active" table */
2180                         active_tbl = lq_sta->active_tbl;
2181                         tbl = &(lq_sta->lq_info[active_tbl]);
2182
2183                         /* Revert to "active" rate and throughput info */
2184                         index = tbl->rate.index;
2185                         current_tpt = lq_sta->last_tpt;
2186
2187                         /* Need to set up a new rate table in uCode */
2188                         update_lq = 1;
2189                 }
2190
2191                 /* Either way, we've made a decision; modulation mode
2192                  * search is done, allow rate adjustment next time. */
2193                 lq_sta->search_better_tbl = 0;
2194                 done_search = 1;        /* Don't switch modes below! */
2195                 goto lq_update;
2196         }
2197
2198         /* (Else) not in search of better modulation mode, try for better
2199          * starting rate, while staying in this mode. */
2200         high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2201         low = high_low & 0xff;
2202         high = (high_low >> 8) & 0xff;
2203
2204         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2205
2206         sr = window->success_ratio;
2207
2208         /* Collect measured throughputs for current and adjacent rates */
2209         current_tpt = window->average_tpt;
2210         if (low != IWL_RATE_INVALID)
2211                 low_tpt = tbl->win[low].average_tpt;
2212         if (high != IWL_RATE_INVALID)
2213                 high_tpt = tbl->win[high].average_tpt;
2214
2215         IWL_DEBUG_RATE(mvm,
2216                        "%s: cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2217                        rs_pretty_rate(rate), current_tpt, sr,
2218                        low, high, low_tpt, high_tpt);
2219
2220         scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2221                                           current_tpt, low_tpt, high_tpt);
2222
2223         /* Force a search in case BT doesn't like us being in MIMO */
2224         if (is_mimo(rate) &&
2225             !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2226                 IWL_DEBUG_RATE(mvm,
2227                                "BT Coex forbids MIMO. Search for new config\n");
2228                 rs_stay_in_table(lq_sta, true);
2229                 goto lq_update;
2230         }
2231
2232         switch (scale_action) {
2233         case RS_ACTION_DOWNSCALE:
2234                 /* Decrease starting rate, update uCode's rate table */
2235                 if (low != IWL_RATE_INVALID) {
2236                         update_lq = 1;
2237                         index = low;
2238                 } else {
2239                         IWL_DEBUG_RATE(mvm,
2240                                        "At the bottom rate. Can't decrease\n");
2241                 }
2242
2243                 break;
2244         case RS_ACTION_UPSCALE:
2245                 /* Increase starting rate, update uCode's rate table */
2246                 if (high != IWL_RATE_INVALID) {
2247                         update_lq = 1;
2248                         index = high;
2249                 } else {
2250                         IWL_DEBUG_RATE(mvm,
2251                                        "At the top rate. Can't increase\n");
2252                 }
2253
2254                 break;
2255         case RS_ACTION_STAY:
2256                 /* No change */
2257                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2258                         update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2259                 break;
2260         default:
2261                 break;
2262         }
2263
2264 lq_update:
2265         /* Replace uCode's rate table for the destination station. */
2266         if (update_lq) {
2267                 tbl->rate.index = index;
2268                 if (IWL_MVM_RS_80_20_FAR_RANGE_TWEAK)
2269                         rs_tweak_rate_tbl(mvm, sta, lq_sta, tbl, scale_action);
2270                 rs_set_amsdu_len(mvm, sta, tbl, scale_action);
2271                 rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2272         }
2273
2274         rs_stay_in_table(lq_sta, false);
2275
2276         /*
2277          * Search for new modulation mode if we're:
2278          * 1)  Not changing rates right now
2279          * 2)  Not just finishing up a search
2280          * 3)  Allowing a new search
2281          */
2282         if (!update_lq && !done_search &&
2283             lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2284             && window->counter) {
2285                 enum rs_column next_column;
2286
2287                 /* Save current throughput to compare with "search" throughput*/
2288                 lq_sta->last_tpt = current_tpt;
2289
2290                 IWL_DEBUG_RATE(mvm,
2291                                "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2292                                update_lq, done_search, lq_sta->rs_state,
2293                                window->counter);
2294
2295                 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2296                 if (next_column != RS_COLUMN_INVALID) {
2297                         int ret = rs_switch_to_column(mvm, lq_sta, sta,
2298                                                       next_column);
2299                         if (!ret)
2300                                 lq_sta->search_better_tbl = 1;
2301                 } else {
2302                         IWL_DEBUG_RATE(mvm,
2303                                        "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2304                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2305                 }
2306
2307                 /* If new "search" mode was selected, set up in uCode table */
2308                 if (lq_sta->search_better_tbl) {
2309                         /* Access the "search" table, clear its history. */
2310                         tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
2311                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
2312
2313                         /* Use new "search" start rate */
2314                         index = tbl->rate.index;
2315
2316                         rs_dump_rate(mvm, &tbl->rate,
2317                                      "Switch to SEARCH TABLE:");
2318                         rs_update_rate_tbl(mvm, sta, lq_sta, tbl);
2319                 } else {
2320                         done_search = 1;
2321                 }
2322         }
2323
2324         if (!ndp)
2325                 rs_tl_turn_on_agg(mvm, mvmsta, tid, lq_sta, sta);
2326
2327         if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2328                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2329                 rs_set_stay_in_table(mvm, is_legacy(&tbl1->rate), lq_sta);
2330         }
2331 }
2332
2333 struct rs_init_rate_info {
2334         s8 rssi;
2335         u8 rate_idx;
2336 };
2337
2338 static const struct rs_init_rate_info rs_optimal_rates_24ghz_legacy[] = {
2339         { -60, IWL_RATE_54M_INDEX },
2340         { -64, IWL_RATE_48M_INDEX },
2341         { -68, IWL_RATE_36M_INDEX },
2342         { -80, IWL_RATE_24M_INDEX },
2343         { -84, IWL_RATE_18M_INDEX },
2344         { -85, IWL_RATE_12M_INDEX },
2345         { -86, IWL_RATE_11M_INDEX },
2346         { -88, IWL_RATE_5M_INDEX  },
2347         { -90, IWL_RATE_2M_INDEX  },
2348         { S8_MIN, IWL_RATE_1M_INDEX },
2349 };
2350
2351 static const struct rs_init_rate_info rs_optimal_rates_5ghz_legacy[] = {
2352         { -60, IWL_RATE_54M_INDEX },
2353         { -64, IWL_RATE_48M_INDEX },
2354         { -72, IWL_RATE_36M_INDEX },
2355         { -80, IWL_RATE_24M_INDEX },
2356         { -84, IWL_RATE_18M_INDEX },
2357         { -85, IWL_RATE_12M_INDEX },
2358         { -87, IWL_RATE_9M_INDEX  },
2359         { S8_MIN, IWL_RATE_6M_INDEX },
2360 };
2361
2362 static const struct rs_init_rate_info rs_optimal_rates_ht[] = {
2363         { -60, IWL_RATE_MCS_7_INDEX },
2364         { -64, IWL_RATE_MCS_6_INDEX },
2365         { -68, IWL_RATE_MCS_5_INDEX },
2366         { -72, IWL_RATE_MCS_4_INDEX },
2367         { -80, IWL_RATE_MCS_3_INDEX },
2368         { -84, IWL_RATE_MCS_2_INDEX },
2369         { -85, IWL_RATE_MCS_1_INDEX },
2370         { S8_MIN, IWL_RATE_MCS_0_INDEX},
2371 };
2372
2373 /* MCS index 9 is not valid for 20MHz VHT channel width,
2374  * but is ok for 40, 80 and 160MHz channels.
2375  */
2376 static const struct rs_init_rate_info rs_optimal_rates_vht_20mhz[] = {
2377         { -60, IWL_RATE_MCS_8_INDEX },
2378         { -64, IWL_RATE_MCS_7_INDEX },
2379         { -68, IWL_RATE_MCS_6_INDEX },
2380         { -72, IWL_RATE_MCS_5_INDEX },
2381         { -80, IWL_RATE_MCS_4_INDEX },
2382         { -84, IWL_RATE_MCS_3_INDEX },
2383         { -85, IWL_RATE_MCS_2_INDEX },
2384         { -87, IWL_RATE_MCS_1_INDEX },
2385         { S8_MIN, IWL_RATE_MCS_0_INDEX},
2386 };
2387
2388 static const struct rs_init_rate_info rs_optimal_rates_vht[] = {
2389         { -60, IWL_RATE_MCS_9_INDEX },
2390         { -64, IWL_RATE_MCS_8_INDEX },
2391         { -68, IWL_RATE_MCS_7_INDEX },
2392         { -72, IWL_RATE_MCS_6_INDEX },
2393         { -80, IWL_RATE_MCS_5_INDEX },
2394         { -84, IWL_RATE_MCS_4_INDEX },
2395         { -85, IWL_RATE_MCS_3_INDEX },
2396         { -87, IWL_RATE_MCS_2_INDEX },
2397         { -88, IWL_RATE_MCS_1_INDEX },
2398         { S8_MIN, IWL_RATE_MCS_0_INDEX },
2399 };
2400
2401 #define IWL_RS_LOW_RSSI_THRESHOLD (-76) /* dBm */
2402
2403 /* Init the optimal rate based on STA caps
2404  * This combined with rssi is used to report the last tx rate
2405  * to userspace when we haven't transmitted enough frames.
2406  */
2407 static void rs_init_optimal_rate(struct iwl_mvm *mvm,
2408                                  struct ieee80211_sta *sta,
2409                                  struct iwl_lq_sta *lq_sta)
2410 {
2411         struct rs_rate *rate = &lq_sta->optimal_rate;
2412
2413         if (lq_sta->max_mimo2_rate_idx != IWL_RATE_INVALID)
2414                 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
2415         else if (lq_sta->max_siso_rate_idx != IWL_RATE_INVALID)
2416                 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
2417         else if (lq_sta->band == NL80211_BAND_5GHZ)
2418                 rate->type = LQ_LEGACY_A;
2419         else
2420                 rate->type = LQ_LEGACY_G;
2421
2422         rate->bw = rs_bw_from_sta_bw(sta);
2423         rate->sgi = rs_sgi_allow(mvm, sta, rate, NULL);
2424
2425         /* ANT/LDPC/STBC aren't relevant for the rate reported to userspace */
2426
2427         if (is_mimo(rate)) {
2428                 lq_sta->optimal_rate_mask = lq_sta->active_mimo2_rate;
2429         } else if (is_siso(rate)) {
2430                 lq_sta->optimal_rate_mask = lq_sta->active_siso_rate;
2431         } else {
2432                 lq_sta->optimal_rate_mask = lq_sta->active_legacy_rate;
2433
2434                 if (lq_sta->band == NL80211_BAND_5GHZ) {
2435                         lq_sta->optimal_rates = rs_optimal_rates_5ghz_legacy;
2436                         lq_sta->optimal_nentries =
2437                                 ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2438                 } else {
2439                         lq_sta->optimal_rates = rs_optimal_rates_24ghz_legacy;
2440                         lq_sta->optimal_nentries =
2441                                 ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2442                 }
2443         }
2444
2445         if (is_vht(rate)) {
2446                 if (rate->bw == RATE_MCS_CHAN_WIDTH_20) {
2447                         lq_sta->optimal_rates = rs_optimal_rates_vht_20mhz;
2448                         lq_sta->optimal_nentries =
2449                                 ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2450                 } else {
2451                         lq_sta->optimal_rates = rs_optimal_rates_vht;
2452                         lq_sta->optimal_nentries =
2453                                 ARRAY_SIZE(rs_optimal_rates_vht);
2454                 }
2455         } else if (is_ht(rate)) {
2456                 lq_sta->optimal_rates = rs_optimal_rates_ht;
2457                 lq_sta->optimal_nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2458         }
2459 }
2460
2461 /* Compute the optimal rate index based on RSSI */
2462 static struct rs_rate *rs_get_optimal_rate(struct iwl_mvm *mvm,
2463                                            struct iwl_lq_sta *lq_sta)
2464 {
2465         struct rs_rate *rate = &lq_sta->optimal_rate;
2466         int i;
2467
2468         rate->index = find_first_bit(&lq_sta->optimal_rate_mask,
2469                                      BITS_PER_LONG);
2470
2471         for (i = 0; i < lq_sta->optimal_nentries; i++) {
2472                 int rate_idx = lq_sta->optimal_rates[i].rate_idx;
2473
2474                 if ((lq_sta->pers.last_rssi >= lq_sta->optimal_rates[i].rssi) &&
2475                     (BIT(rate_idx) & lq_sta->optimal_rate_mask)) {
2476                         rate->index = rate_idx;
2477                         break;
2478                 }
2479         }
2480
2481         return rate;
2482 }
2483
2484 /* Choose an initial legacy rate and antenna to use based on the RSSI
2485  * of last Rx
2486  */
2487 static void rs_get_initial_rate(struct iwl_mvm *mvm,
2488                                 struct ieee80211_sta *sta,
2489                                 struct iwl_lq_sta *lq_sta,
2490                                 enum nl80211_band band,
2491                                 struct rs_rate *rate)
2492 {
2493         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2494         int i, nentries;
2495         unsigned long active_rate;
2496         s8 best_rssi = S8_MIN;
2497         u8 best_ant = ANT_NONE;
2498         u8 valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
2499         const struct rs_init_rate_info *initial_rates;
2500
2501         for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2502                 if (!(lq_sta->pers.chains & BIT(i)))
2503                         continue;
2504
2505                 if (lq_sta->pers.chain_signal[i] > best_rssi) {
2506                         best_rssi = lq_sta->pers.chain_signal[i];
2507                         best_ant = BIT(i);
2508                 }
2509         }
2510
2511         IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2512                        iwl_rs_pretty_ant(best_ant), best_rssi);
2513
2514         if (best_ant != ANT_A && best_ant != ANT_B)
2515                 rate->ant = first_antenna(valid_tx_ant);
2516         else
2517                 rate->ant = best_ant;
2518
2519         rate->sgi = false;
2520         rate->ldpc = false;
2521         rate->bw = RATE_MCS_CHAN_WIDTH_20;
2522
2523         rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2524                                      BITS_PER_LONG);
2525
2526         if (band == NL80211_BAND_5GHZ) {
2527                 rate->type = LQ_LEGACY_A;
2528                 initial_rates = rs_optimal_rates_5ghz_legacy;
2529                 nentries = ARRAY_SIZE(rs_optimal_rates_5ghz_legacy);
2530         } else {
2531                 rate->type = LQ_LEGACY_G;
2532                 initial_rates = rs_optimal_rates_24ghz_legacy;
2533                 nentries = ARRAY_SIZE(rs_optimal_rates_24ghz_legacy);
2534         }
2535
2536         if (!IWL_MVM_RS_RSSI_BASED_INIT_RATE)
2537                 goto out;
2538
2539         /* Start from a higher rate if the corresponding debug capability
2540          * is enabled. The rate is chosen according to AP capabilities.
2541          * In case of VHT/HT when the rssi is low fallback to the case of
2542          * legacy rates.
2543          */
2544         if (sta->deflink.vht_cap.vht_supported &&
2545             best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2546                 /*
2547                  * In AP mode, when a new station associates, rs is initialized
2548                  * immediately upon association completion, before the phy
2549                  * context is updated with the association parameters, so the
2550                  * sta bandwidth might be wider than the phy context allows.
2551                  * To avoid this issue, always initialize rs with 20mhz
2552                  * bandwidth rate, and after authorization, when the phy context
2553                  * is already up-to-date, re-init rs with the correct bw.
2554                  */
2555                 u32 bw = mvmsta->sta_state < IEEE80211_STA_AUTHORIZED ?
2556                                 RATE_MCS_CHAN_WIDTH_20 : rs_bw_from_sta_bw(sta);
2557
2558                 switch (bw) {
2559                 case RATE_MCS_CHAN_WIDTH_40:
2560                 case RATE_MCS_CHAN_WIDTH_80:
2561                 case RATE_MCS_CHAN_WIDTH_160:
2562                         initial_rates = rs_optimal_rates_vht;
2563                         nentries = ARRAY_SIZE(rs_optimal_rates_vht);
2564                         break;
2565                 case RATE_MCS_CHAN_WIDTH_20:
2566                         initial_rates = rs_optimal_rates_vht_20mhz;
2567                         nentries = ARRAY_SIZE(rs_optimal_rates_vht_20mhz);
2568                         break;
2569                 default:
2570                         IWL_ERR(mvm, "Invalid BW %d\n",
2571                                 sta->deflink.bandwidth);
2572                         goto out;
2573                 }
2574
2575                 active_rate = lq_sta->active_siso_rate;
2576                 rate->type = LQ_VHT_SISO;
2577                 rate->bw = bw;
2578         } else if (sta->deflink.ht_cap.ht_supported &&
2579                    best_rssi > IWL_RS_LOW_RSSI_THRESHOLD) {
2580                 initial_rates = rs_optimal_rates_ht;
2581                 nentries = ARRAY_SIZE(rs_optimal_rates_ht);
2582                 active_rate = lq_sta->active_siso_rate;
2583                 rate->type = LQ_HT_SISO;
2584         } else {
2585                 active_rate = lq_sta->active_legacy_rate;
2586         }
2587
2588         for (i = 0; i < nentries; i++) {
2589                 int rate_idx = initial_rates[i].rate_idx;
2590
2591                 if ((best_rssi >= initial_rates[i].rssi) &&
2592                     (BIT(rate_idx) & active_rate)) {
2593                         rate->index = rate_idx;
2594                         break;
2595                 }
2596         }
2597
2598 out:
2599         rs_dump_rate(mvm, rate, "INITIAL");
2600 }
2601
2602 /* Save info about RSSI of last Rx */
2603 void rs_update_last_rssi(struct iwl_mvm *mvm,
2604                          struct iwl_mvm_sta *mvmsta,
2605                          struct ieee80211_rx_status *rx_status)
2606 {
2607         struct iwl_lq_sta *lq_sta = &mvmsta->deflink.lq_sta.rs_drv;
2608         int i;
2609
2610         lq_sta->pers.chains = rx_status->chains;
2611         lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2612         lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2613         lq_sta->pers.last_rssi = S8_MIN;
2614
2615         for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2616                 if (!(lq_sta->pers.chains & BIT(i)))
2617                         continue;
2618
2619                 if (lq_sta->pers.chain_signal[i] > lq_sta->pers.last_rssi)
2620                         lq_sta->pers.last_rssi = lq_sta->pers.chain_signal[i];
2621         }
2622 }
2623
2624 /*
2625  * rs_initialize_lq - Initialize a station's hardware rate table
2626  *
2627  * The uCode's station table contains a table of fallback rates
2628  * for automatic fallback during transmission.
2629  *
2630  * NOTE: This sets up a default set of values.  These will be replaced later
2631  *       if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2632  *       rc80211_simple.
2633  *
2634  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2635  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2636  *       which requires station table entry to exist).
2637  */
2638 static void rs_initialize_lq(struct iwl_mvm *mvm,
2639                              struct ieee80211_sta *sta,
2640                              struct iwl_lq_sta *lq_sta,
2641                              enum nl80211_band band)
2642 {
2643         struct iwl_scale_tbl_info *tbl;
2644         struct rs_rate *rate;
2645         u8 active_tbl = 0;
2646
2647         if (!sta || !lq_sta)
2648                 return;
2649
2650         if (!lq_sta->search_better_tbl)
2651                 active_tbl = lq_sta->active_tbl;
2652         else
2653                 active_tbl = rs_search_tbl(lq_sta->active_tbl);
2654
2655         tbl = &(lq_sta->lq_info[active_tbl]);
2656         rate = &tbl->rate;
2657
2658         rs_get_initial_rate(mvm, sta, lq_sta, band, rate);
2659         rs_init_optimal_rate(mvm, sta, lq_sta);
2660
2661         WARN_ONCE(rate->ant != ANT_A && rate->ant != ANT_B,
2662                   "ant: 0x%x, chains 0x%x, fw tx ant: 0x%x, nvm tx ant: 0x%x\n",
2663                   rate->ant, lq_sta->pers.chains, mvm->fw->valid_tx_ant,
2664                   mvm->nvm_data ? mvm->nvm_data->valid_tx_ant : ANT_INVALID);
2665
2666         tbl->column = rs_get_column_from_rate(rate);
2667
2668         rs_set_expected_tpt_table(lq_sta, tbl);
2669         rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2670         /* TODO restore station should remember the lq cmd */
2671         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq);
2672 }
2673
2674 static void rs_drv_get_rate(void *mvm_r, struct ieee80211_sta *sta,
2675                             void *mvm_sta,
2676                             struct ieee80211_tx_rate_control *txrc)
2677 {
2678         struct iwl_op_mode *op_mode = mvm_r;
2679         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2680         struct sk_buff *skb = txrc->skb;
2681         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2682         struct iwl_lq_sta *lq_sta;
2683         struct rs_rate *optimal_rate;
2684         u32 last_ucode_rate;
2685
2686         if (sta && !iwl_mvm_sta_from_mac80211(sta)->vif) {
2687                 /* if vif isn't initialized mvm doesn't know about
2688                  * this station, so don't do anything with the it
2689                  */
2690                 mvm_sta = NULL;
2691         }
2692
2693         if (!mvm_sta)
2694                 return;
2695
2696         lq_sta = mvm_sta;
2697
2698         spin_lock_bh(&lq_sta->pers.lock);
2699         iwl_mvm_hwrate_to_tx_rate_v1(lq_sta->last_rate_n_flags,
2700                                      info->band, &info->control.rates[0]);
2701         info->control.rates[0].count = 1;
2702
2703         /* Report the optimal rate based on rssi and STA caps if we haven't
2704          * converged yet (too little traffic) or exploring other modulations
2705          */
2706         if (lq_sta->rs_state != RS_STATE_STAY_IN_COLUMN) {
2707                 optimal_rate = rs_get_optimal_rate(mvm, lq_sta);
2708                 last_ucode_rate = ucode_rate_from_rs_rate(mvm,
2709                                                           optimal_rate);
2710                 iwl_mvm_hwrate_to_tx_rate_v1(last_ucode_rate, info->band,
2711                                              &txrc->reported_rate);
2712         }
2713         spin_unlock_bh(&lq_sta->pers.lock);
2714 }
2715
2716 static void *rs_drv_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2717                               gfp_t gfp)
2718 {
2719         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2720         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2721         struct iwl_mvm *mvm  = IWL_OP_MODE_GET_MVM(op_mode);
2722         struct iwl_lq_sta *lq_sta = &mvmsta->deflink.lq_sta.rs_drv;
2723
2724         IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2725
2726         lq_sta->pers.drv = mvm;
2727 #ifdef CONFIG_MAC80211_DEBUGFS
2728         lq_sta->pers.dbg_fixed_rate = 0;
2729         lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2730         lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
2731 #endif
2732         lq_sta->pers.chains = 0;
2733         memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
2734         lq_sta->pers.last_rssi = S8_MIN;
2735
2736         return lq_sta;
2737 }
2738
2739 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2740                                        int nss)
2741 {
2742         u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2743                 (0x3 << (2 * (nss - 1)));
2744         rx_mcs >>= (2 * (nss - 1));
2745
2746         if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2747                 return IWL_RATE_MCS_7_INDEX;
2748         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2749                 return IWL_RATE_MCS_8_INDEX;
2750         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2751                 return IWL_RATE_MCS_9_INDEX;
2752
2753         WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2754         return -1;
2755 }
2756
2757 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2758                                      struct ieee80211_sta_vht_cap *vht_cap,
2759                                      struct iwl_lq_sta *lq_sta)
2760 {
2761         int i;
2762         int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2763
2764         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2765                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2766                         if (i == IWL_RATE_9M_INDEX)
2767                                 continue;
2768
2769                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2770                         if (i == IWL_RATE_MCS_9_INDEX &&
2771                             sta->deflink.bandwidth == IEEE80211_STA_RX_BW_20)
2772                                 continue;
2773
2774                         lq_sta->active_siso_rate |= BIT(i);
2775                 }
2776         }
2777
2778         if (sta->deflink.rx_nss < 2)
2779                 return;
2780
2781         highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2782         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2783                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2784                         if (i == IWL_RATE_9M_INDEX)
2785                                 continue;
2786
2787                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2788                         if (i == IWL_RATE_MCS_9_INDEX &&
2789                             sta->deflink.bandwidth == IEEE80211_STA_RX_BW_20)
2790                                 continue;
2791
2792                         lq_sta->active_mimo2_rate |= BIT(i);
2793                 }
2794         }
2795 }
2796
2797 static void rs_ht_init(struct iwl_mvm *mvm,
2798                        struct ieee80211_sta *sta,
2799                        struct iwl_lq_sta *lq_sta,
2800                        struct ieee80211_sta_ht_cap *ht_cap)
2801 {
2802         /* active_siso_rate mask includes 9 MBits (bit 5),
2803          * and CCK (bits 0-3), supp_rates[] does not;
2804          * shift to convert format, force 9 MBits off.
2805          */
2806         lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2807         lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2808         lq_sta->active_siso_rate &= ~((u16)0x2);
2809         lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2810
2811         lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2812         lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2813         lq_sta->active_mimo2_rate &= ~((u16)0x2);
2814         lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2815
2816         if (mvm->cfg->ht_params->ldpc &&
2817             (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
2818                 lq_sta->ldpc = true;
2819
2820         if (mvm->cfg->ht_params->stbc &&
2821             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2822             (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC))
2823                 lq_sta->stbc_capable = true;
2824
2825         lq_sta->is_vht = false;
2826 }
2827
2828 static void rs_vht_init(struct iwl_mvm *mvm,
2829                         struct ieee80211_sta *sta,
2830                         struct iwl_lq_sta *lq_sta,
2831                         struct ieee80211_sta_vht_cap *vht_cap)
2832 {
2833         rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
2834
2835         if (mvm->cfg->ht_params->ldpc &&
2836             (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
2837                 lq_sta->ldpc = true;
2838
2839         if (mvm->cfg->ht_params->stbc &&
2840             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2841             (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))
2842                 lq_sta->stbc_capable = true;
2843
2844         if (fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_BEAMFORMER) &&
2845             (num_of_ant(iwl_mvm_get_valid_tx_ant(mvm)) > 1) &&
2846             (vht_cap->cap & IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE))
2847                 lq_sta->bfer_capable = true;
2848
2849         lq_sta->is_vht = true;
2850 }
2851
2852 #ifdef CONFIG_IWLWIFI_DEBUGFS
2853 void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm)
2854 {
2855         spin_lock_bh(&mvm->drv_stats_lock);
2856         memset(&mvm->drv_rx_stats, 0, sizeof(mvm->drv_rx_stats));
2857         spin_unlock_bh(&mvm->drv_stats_lock);
2858 }
2859
2860 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm, u32 rate, bool agg)
2861 {
2862         u8 nss = 0;
2863
2864         spin_lock(&mvm->drv_stats_lock);
2865
2866         if (agg)
2867                 mvm->drv_rx_stats.agg_frames++;
2868
2869         mvm->drv_rx_stats.success_frames++;
2870
2871         switch (rate & RATE_MCS_CHAN_WIDTH_MSK_V1) {
2872         case RATE_MCS_CHAN_WIDTH_20:
2873                 mvm->drv_rx_stats.bw_20_frames++;
2874                 break;
2875         case RATE_MCS_CHAN_WIDTH_40:
2876                 mvm->drv_rx_stats.bw_40_frames++;
2877                 break;
2878         case RATE_MCS_CHAN_WIDTH_80:
2879                 mvm->drv_rx_stats.bw_80_frames++;
2880                 break;
2881         case RATE_MCS_CHAN_WIDTH_160:
2882                 mvm->drv_rx_stats.bw_160_frames++;
2883                 break;
2884         default:
2885                 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
2886         }
2887
2888         if (rate & RATE_MCS_HT_MSK_V1) {
2889                 mvm->drv_rx_stats.ht_frames++;
2890                 nss = ((rate & RATE_HT_MCS_NSS_MSK_V1) >> RATE_HT_MCS_NSS_POS_V1) + 1;
2891         } else if (rate & RATE_MCS_VHT_MSK_V1) {
2892                 mvm->drv_rx_stats.vht_frames++;
2893                 nss = FIELD_GET(RATE_MCS_NSS_MSK, rate) + 1;
2894         } else {
2895                 mvm->drv_rx_stats.legacy_frames++;
2896         }
2897
2898         if (nss == 1)
2899                 mvm->drv_rx_stats.siso_frames++;
2900         else if (nss == 2)
2901                 mvm->drv_rx_stats.mimo2_frames++;
2902
2903         if (rate & RATE_MCS_SGI_MSK_V1)
2904                 mvm->drv_rx_stats.sgi_frames++;
2905         else
2906                 mvm->drv_rx_stats.ngi_frames++;
2907
2908         mvm->drv_rx_stats.last_rates[mvm->drv_rx_stats.last_frame_idx] = rate;
2909         mvm->drv_rx_stats.last_frame_idx =
2910                 (mvm->drv_rx_stats.last_frame_idx + 1) %
2911                         ARRAY_SIZE(mvm->drv_rx_stats.last_rates);
2912
2913         spin_unlock(&mvm->drv_stats_lock);
2914 }
2915 #endif
2916
2917 /*
2918  * Called after adding a new station to initialize rate scaling
2919  */
2920 static void rs_drv_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2921                              enum nl80211_band band)
2922 {
2923         int i, j;
2924         struct ieee80211_hw *hw = mvm->hw;
2925         struct ieee80211_sta_ht_cap *ht_cap = &sta->deflink.ht_cap;
2926         struct ieee80211_sta_vht_cap *vht_cap = &sta->deflink.vht_cap;
2927         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
2928         struct iwl_lq_sta *lq_sta = &mvmsta->deflink.lq_sta.rs_drv;
2929         struct ieee80211_supported_band *sband;
2930         unsigned long supp; /* must be unsigned long for for_each_set_bit */
2931
2932         lockdep_assert_held(&mvmsta->deflink.lq_sta.rs_drv.pers.lock);
2933
2934         /* clear all non-persistent lq data */
2935         memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
2936
2937         sband = hw->wiphy->bands[band];
2938
2939         lq_sta->lq.sta_id = mvmsta->deflink.sta_id;
2940         mvmsta->amsdu_enabled = 0;
2941         mvmsta->max_amsdu_len = sta->cur->max_amsdu_len;
2942
2943         for (j = 0; j < LQ_SIZE; j++)
2944                 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
2945
2946         lq_sta->flush_timer = 0;
2947         lq_sta->last_tx = jiffies;
2948
2949         IWL_DEBUG_RATE(mvm,
2950                        "LQ: *** rate scale station global init for station %d ***\n",
2951                        mvmsta->deflink.sta_id);
2952         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2953          * the lowest or the highest rate.. Could consider using RSSI from
2954          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2955          * after assoc.. */
2956
2957         lq_sta->missed_rate_counter = IWL_MVM_RS_MISSED_RATE_MAX;
2958         lq_sta->band = sband->band;
2959         /*
2960          * active legacy rates as per supported rates bitmap
2961          */
2962         supp = sta->deflink.supp_rates[sband->band];
2963         lq_sta->active_legacy_rate = 0;
2964         for_each_set_bit(i, &supp, BITS_PER_LONG)
2965                 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2966
2967         /* TODO: should probably account for rx_highest for both HT/VHT */
2968         if (!vht_cap || !vht_cap->vht_supported)
2969                 rs_ht_init(mvm, sta, lq_sta, ht_cap);
2970         else
2971                 rs_vht_init(mvm, sta, lq_sta, vht_cap);
2972
2973         lq_sta->max_legacy_rate_idx =
2974                 rs_get_max_rate_from_mask(lq_sta->active_legacy_rate);
2975         lq_sta->max_siso_rate_idx =
2976                 rs_get_max_rate_from_mask(lq_sta->active_siso_rate);
2977         lq_sta->max_mimo2_rate_idx =
2978                 rs_get_max_rate_from_mask(lq_sta->active_mimo2_rate);
2979
2980         IWL_DEBUG_RATE(mvm,
2981                        "LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC=%d BFER=%d\n",
2982                        lq_sta->active_legacy_rate,
2983                        lq_sta->active_siso_rate,
2984                        lq_sta->active_mimo2_rate,
2985                        lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc_capable,
2986                        lq_sta->bfer_capable);
2987         IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
2988                        lq_sta->max_legacy_rate_idx,
2989                        lq_sta->max_siso_rate_idx,
2990                        lq_sta->max_mimo2_rate_idx);
2991
2992         /* These values will be overridden later */
2993         lq_sta->lq.single_stream_ant_msk =
2994                 iwl_mvm_bt_coex_get_single_ant_msk(mvm, iwl_mvm_get_valid_tx_ant(mvm));
2995         lq_sta->lq.dual_stream_ant_msk = ANT_AB;
2996
2997         /* as default allow aggregation for all tids */
2998         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2999         lq_sta->is_agg = 0;
3000 #ifdef CONFIG_IWLWIFI_DEBUGFS
3001         iwl_mvm_reset_frame_stats(mvm);
3002 #endif
3003         rs_initialize_lq(mvm, sta, lq_sta, band);
3004 }
3005
3006 static void rs_drv_rate_update(void *mvm_r,
3007                                struct ieee80211_supported_band *sband,
3008                                struct cfg80211_chan_def *chandef,
3009                                struct ieee80211_sta *sta,
3010                                void *priv_sta, u32 changed)
3011 {
3012         struct iwl_op_mode *op_mode = mvm_r;
3013         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3014         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3015         u8 tid;
3016
3017         if (!mvmsta->vif)
3018                 return;
3019
3020         /* Stop any ongoing aggregations as rs starts off assuming no agg */
3021         for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
3022                 ieee80211_stop_tx_ba_session(sta, tid);
3023
3024         iwl_mvm_rs_rate_init(mvm, mvmsta->vif, sta,
3025                              &mvmsta->vif->bss_conf, &sta->deflink,
3026                              sband->band);
3027 }
3028
3029 static void __iwl_mvm_rs_tx_status(struct iwl_mvm *mvm,
3030                                    struct ieee80211_sta *sta,
3031                                    int tid, struct ieee80211_tx_info *info,
3032                                    bool ndp)
3033 {
3034         int legacy_success;
3035         int retries;
3036         int i;
3037         struct iwl_lq_cmd *table;
3038         u32 lq_hwrate;
3039         struct rs_rate lq_rate, tx_resp_rate;
3040         struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
3041         u32 tlc_info = (uintptr_t)info->status.status_driver_data[0];
3042         u8 reduced_txp = tlc_info & RS_DRV_DATA_TXP_MSK;
3043         u8 lq_color = RS_DRV_DATA_LQ_COLOR_GET(tlc_info);
3044         u32 tx_resp_hwrate = (uintptr_t)info->status.status_driver_data[1];
3045         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3046         struct iwl_lq_sta *lq_sta = &mvmsta->deflink.lq_sta.rs_drv;
3047
3048         if (!lq_sta->pers.drv) {
3049                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
3050                 return;
3051         }
3052
3053         /* This packet was aggregated but doesn't carry status info */
3054         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
3055             !(info->flags & IEEE80211_TX_STAT_AMPDU))
3056                 return;
3057
3058         if (rs_rate_from_ucode_rate(tx_resp_hwrate, info->band,
3059                                     &tx_resp_rate)) {
3060                 WARN_ON_ONCE(1);
3061                 return;
3062         }
3063
3064 #ifdef CONFIG_MAC80211_DEBUGFS
3065         /* Disable last tx check if we are debugging with fixed rate but
3066          * update tx stats
3067          */
3068         if (lq_sta->pers.dbg_fixed_rate) {
3069                 int index = tx_resp_rate.index;
3070                 enum rs_column column;
3071                 int attempts, success;
3072
3073                 column = rs_get_column_from_rate(&tx_resp_rate);
3074                 if (WARN_ONCE(column == RS_COLUMN_INVALID,
3075                               "Can't map rate 0x%x to column",
3076                               tx_resp_hwrate))
3077                         return;
3078
3079                 if (info->flags & IEEE80211_TX_STAT_AMPDU) {
3080                         attempts = info->status.ampdu_len;
3081                         success = info->status.ampdu_ack_len;
3082                 } else {
3083                         attempts = info->status.rates[0].count;
3084                         success = !!(info->flags & IEEE80211_TX_STAT_ACK);
3085                 }
3086
3087                 lq_sta->pers.tx_stats[column][index].total += attempts;
3088                 lq_sta->pers.tx_stats[column][index].success += success;
3089
3090                 IWL_DEBUG_RATE(mvm, "Fixed rate 0x%x success %d attempts %d\n",
3091                                tx_resp_hwrate, success, attempts);
3092                 return;
3093         }
3094 #endif
3095
3096         if (time_after(jiffies,
3097                        (unsigned long)(lq_sta->last_tx +
3098                                        (IWL_MVM_RS_IDLE_TIMEOUT * HZ)))) {
3099                 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
3100                 /* reach here only in case of driver RS, call directly
3101                  * the unlocked version
3102                  */
3103                 rs_drv_rate_init(mvm, sta, info->band);
3104                 return;
3105         }
3106         lq_sta->last_tx = jiffies;
3107
3108         /* Ignore this Tx frame response if its initial rate doesn't match
3109          * that of latest Link Quality command.  There may be stragglers
3110          * from a previous Link Quality command, but we're no longer interested
3111          * in those; they're either from the "active" mode while we're trying
3112          * to check "search" mode, or a prior "search" mode after we've moved
3113          * to a new "search" mode (which might become the new "active" mode).
3114          */
3115         table = &lq_sta->lq;
3116         lq_hwrate = le32_to_cpu(table->rs_table[0]);
3117         if (rs_rate_from_ucode_rate(lq_hwrate, info->band, &lq_rate)) {
3118                 WARN_ON_ONCE(1);
3119                 return;
3120         }
3121
3122         /* Here we actually compare this rate to the latest LQ command */
3123         if (lq_color != LQ_FLAG_COLOR_GET(table->flags)) {
3124                 IWL_DEBUG_RATE(mvm,
3125                                "tx resp color 0x%x does not match 0x%x\n",
3126                                lq_color, LQ_FLAG_COLOR_GET(table->flags));
3127
3128                 /* Since rates mis-match, the last LQ command may have failed.
3129                  * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
3130                  * ... driver.
3131                  */
3132                 lq_sta->missed_rate_counter++;
3133                 if (lq_sta->missed_rate_counter > IWL_MVM_RS_MISSED_RATE_MAX) {
3134                         lq_sta->missed_rate_counter = 0;
3135                         IWL_DEBUG_RATE(mvm,
3136                                        "Too many rates mismatch. Send sync LQ. rs_state %d\n",
3137                                        lq_sta->rs_state);
3138                         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq);
3139                 }
3140                 /* Regardless, ignore this status info for outdated rate */
3141                 return;
3142         }
3143
3144         /* Rate did match, so reset the missed_rate_counter */
3145         lq_sta->missed_rate_counter = 0;
3146
3147         if (!lq_sta->search_better_tbl) {
3148                 curr_tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3149                 other_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
3150         } else {
3151                 curr_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
3152                 other_tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3153         }
3154
3155         if (WARN_ON_ONCE(!rs_rate_column_match(&lq_rate, &curr_tbl->rate))) {
3156                 IWL_DEBUG_RATE(mvm,
3157                                "Neither active nor search matches tx rate\n");
3158                 tmp_tbl = &lq_sta->lq_info[lq_sta->active_tbl];
3159                 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
3160                 tmp_tbl = &lq_sta->lq_info[rs_search_tbl(lq_sta->active_tbl)];
3161                 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
3162                 rs_dump_rate(mvm, &lq_rate, "ACTUAL");
3163
3164                 /* no matching table found, let's by-pass the data collection
3165                  * and continue to perform rate scale to find the rate table
3166                  */
3167                 rs_stay_in_table(lq_sta, true);
3168                 goto done;
3169         }
3170
3171         /* Updating the frame history depends on whether packets were
3172          * aggregated.
3173          *
3174          * For aggregation, all packets were transmitted at the same rate, the
3175          * first index into rate scale table.
3176          */
3177         if (info->flags & IEEE80211_TX_STAT_AMPDU) {
3178                 rs_collect_tpc_data(mvm, lq_sta, curr_tbl, tx_resp_rate.index,
3179                                     info->status.ampdu_len,
3180                                     info->status.ampdu_ack_len,
3181                                     reduced_txp);
3182
3183                 /* ampdu_ack_len = 0 marks no BA was received. For TLC, treat
3184                  * it as a single frame loss as we don't want the success ratio
3185                  * to dip too quickly because a BA wasn't received.
3186                  * For TPC, there's no need for this optimisation since we want
3187                  * to recover very quickly from a bad power reduction and,
3188                  * therefore we'd like the success ratio to get an immediate hit
3189                  * when failing to get a BA, so we'd switch back to a lower or
3190                  * zero power reduction. When FW transmits agg with a rate
3191                  * different from the initial rate, it will not use reduced txp
3192                  * and will send BA notification twice (one empty with reduced
3193                  * txp equal to the value from LQ and one with reduced txp 0).
3194                  * We need to update counters for each txp level accordingly.
3195                  */
3196                 if (info->status.ampdu_ack_len == 0)
3197                         info->status.ampdu_len = 1;
3198
3199                 rs_collect_tlc_data(mvm, mvmsta, tid, curr_tbl,
3200                                     tx_resp_rate.index,
3201                                     info->status.ampdu_len,
3202                                     info->status.ampdu_ack_len);
3203
3204                 /* Update success/fail counts if not searching for new mode */
3205                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
3206                         lq_sta->total_success += info->status.ampdu_ack_len;
3207                         lq_sta->total_failed += (info->status.ampdu_len -
3208                                         info->status.ampdu_ack_len);
3209                 }
3210         } else {
3211                 /* For legacy, update frame history with for each Tx retry. */
3212                 retries = info->status.rates[0].count - 1;
3213                 /* HW doesn't send more than 15 retries */
3214                 retries = min(retries, 15);
3215
3216                 /* The last transmission may have been successful */
3217                 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
3218                 /* Collect data for each rate used during failed TX attempts */
3219                 for (i = 0; i <= retries; ++i) {
3220                         lq_hwrate = le32_to_cpu(table->rs_table[i]);
3221                         if (rs_rate_from_ucode_rate(lq_hwrate, info->band,
3222                                                     &lq_rate)) {
3223                                 WARN_ON_ONCE(1);
3224                                 return;
3225                         }
3226
3227                         /* Only collect stats if retried rate is in the same RS
3228                          * table as active/search.
3229                          */
3230                         if (rs_rate_column_match(&lq_rate, &curr_tbl->rate))
3231                                 tmp_tbl = curr_tbl;
3232                         else if (rs_rate_column_match(&lq_rate,
3233                                                       &other_tbl->rate))
3234                                 tmp_tbl = other_tbl;
3235                         else
3236                                 continue;
3237
3238                         rs_collect_tpc_data(mvm, lq_sta, tmp_tbl,
3239                                             tx_resp_rate.index, 1,
3240                                             i < retries ? 0 : legacy_success,
3241                                             reduced_txp);
3242                         rs_collect_tlc_data(mvm, mvmsta, tid, tmp_tbl,
3243                                             tx_resp_rate.index, 1,
3244                                             i < retries ? 0 : legacy_success);
3245                 }
3246
3247                 /* Update success/fail counts if not searching for new mode */
3248                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
3249                         lq_sta->total_success += legacy_success;
3250                         lq_sta->total_failed += retries + (1 - legacy_success);
3251                 }
3252         }
3253         /* The last TX rate is cached in lq_sta; it's set in if/else above */
3254         lq_sta->last_rate_n_flags = lq_hwrate;
3255         IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
3256 done:
3257         /* See if there's a better rate or modulation mode to try. */
3258         if (sta->deflink.supp_rates[info->band])
3259                 rs_rate_scale_perform(mvm, sta, lq_sta, tid, ndp);
3260 }
3261
3262 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
3263                           int tid, struct ieee80211_tx_info *info, bool ndp)
3264 {
3265         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3266
3267         /* If it's locked we are in middle of init flow
3268          * just wait for next tx status to update the lq_sta data
3269          */
3270         if (!spin_trylock_bh(&mvmsta->deflink.lq_sta.rs_drv.pers.lock))
3271                 return;
3272
3273         __iwl_mvm_rs_tx_status(mvm, sta, tid, info, ndp);
3274         spin_unlock_bh(&mvmsta->deflink.lq_sta.rs_drv.pers.lock);
3275 }
3276
3277 #ifdef CONFIG_MAC80211_DEBUGFS
3278 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
3279                                             struct iwl_lq_cmd *lq_cmd,
3280                                             enum nl80211_band band,
3281                                             u32 ucode_rate)
3282 {
3283         struct rs_rate rate;
3284         int i;
3285         int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
3286         __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
3287         u8 ant = (ucode_rate & RATE_MCS_ANT_AB_MSK) >> RATE_MCS_ANT_POS;
3288
3289         for (i = 0; i < num_rates; i++)
3290                 lq_cmd->rs_table[i] = ucode_rate_le32;
3291
3292         if (rs_rate_from_ucode_rate(ucode_rate, band, &rate)) {
3293                 WARN_ON_ONCE(1);
3294                 return;
3295         }
3296
3297         if (is_mimo(&rate))
3298                 lq_cmd->mimo_delim = num_rates - 1;
3299         else
3300                 lq_cmd->mimo_delim = 0;
3301
3302         lq_cmd->reduced_tpc = 0;
3303
3304         if (num_of_ant(ant) == 1)
3305                 lq_cmd->single_stream_ant_msk = ant;
3306
3307         if (!mvm->trans->trans_cfg->gen2)
3308                 lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
3309         else
3310                 lq_cmd->agg_frame_cnt_limit =
3311                         LINK_QUAL_AGG_FRAME_LIMIT_GEN2_DEF;
3312 }
3313 #endif /* CONFIG_MAC80211_DEBUGFS */
3314
3315 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
3316                                      struct iwl_lq_sta *lq_sta,
3317                                      struct rs_rate *rate,
3318                                      __le32 *rs_table, int *rs_table_index,
3319                                      int num_rates, int num_retries,
3320                                      u8 valid_tx_ant, bool toggle_ant)
3321 {
3322         int i, j;
3323         __le32 ucode_rate;
3324         bool bottom_reached = false;
3325         int prev_rate_idx = rate->index;
3326         int end = LINK_QUAL_MAX_RETRY_NUM;
3327         int index = *rs_table_index;
3328
3329         for (i = 0; i < num_rates && index < end; i++) {
3330                 for (j = 0; j < num_retries && index < end; j++, index++) {
3331                         ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm,
3332                                                                          rate));
3333                         rs_table[index] = ucode_rate;
3334                         if (toggle_ant)
3335                                 rs_toggle_antenna(valid_tx_ant, rate);
3336                 }
3337
3338                 prev_rate_idx = rate->index;
3339                 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
3340                 if (bottom_reached && !is_legacy(rate))
3341                         break;
3342         }
3343
3344         if (!bottom_reached && !is_legacy(rate))
3345                 rate->index = prev_rate_idx;
3346
3347         *rs_table_index = index;
3348 }
3349
3350 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
3351  * column the rate table should look like this:
3352  *
3353  * rate[0] 0x400F019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3354  * rate[1] 0x400F019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
3355  * rate[2] 0x400F018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3356  * rate[3] 0x400F018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
3357  * rate[4] 0x400F017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3358  * rate[5] 0x400F017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
3359  * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
3360  * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
3361  * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
3362  * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
3363  * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
3364  * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
3365  * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
3366  * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
3367  * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
3368  * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
3369  */
3370 static void rs_build_rates_table(struct iwl_mvm *mvm,
3371                                  struct ieee80211_sta *sta,
3372                                  struct iwl_lq_sta *lq_sta,
3373                                  const struct rs_rate *initial_rate)
3374 {
3375         struct rs_rate rate;
3376         int num_rates, num_retries, index = 0;
3377         u8 valid_tx_ant = 0;
3378         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3379         bool toggle_ant = false;
3380         u32 color;
3381
3382         memcpy(&rate, initial_rate, sizeof(rate));
3383
3384         valid_tx_ant = iwl_mvm_get_valid_tx_ant(mvm);
3385
3386         /* TODO: remove old API when min FW API hits 14 */
3387         if (!fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS) &&
3388             rs_stbc_allow(mvm, sta, lq_sta))
3389                 rate.stbc = true;
3390
3391         if (is_siso(&rate)) {
3392                 num_rates = IWL_MVM_RS_INITIAL_SISO_NUM_RATES;
3393                 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3394         } else if (is_mimo(&rate)) {
3395                 num_rates = IWL_MVM_RS_INITIAL_MIMO_NUM_RATES;
3396                 num_retries = IWL_MVM_RS_HT_VHT_RETRIES_PER_RATE;
3397         } else {
3398                 num_rates = IWL_MVM_RS_INITIAL_LEGACY_NUM_RATES;
3399                 num_retries = IWL_MVM_RS_INITIAL_LEGACY_RETRIES;
3400                 toggle_ant = true;
3401         }
3402
3403         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3404                                  num_rates, num_retries, valid_tx_ant,
3405                                  toggle_ant);
3406
3407         rs_get_lower_rate_down_column(lq_sta, &rate);
3408
3409         if (is_siso(&rate)) {
3410                 num_rates = IWL_MVM_RS_SECONDARY_SISO_NUM_RATES;
3411                 num_retries = IWL_MVM_RS_SECONDARY_SISO_RETRIES;
3412                 lq_cmd->mimo_delim = index;
3413         } else if (is_legacy(&rate)) {
3414                 num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3415                 num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3416         } else {
3417                 WARN_ON_ONCE(1);
3418         }
3419
3420         toggle_ant = true;
3421
3422         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3423                                  num_rates, num_retries, valid_tx_ant,
3424                                  toggle_ant);
3425
3426         rs_get_lower_rate_down_column(lq_sta, &rate);
3427
3428         num_rates = IWL_MVM_RS_SECONDARY_LEGACY_NUM_RATES;
3429         num_retries = IWL_MVM_RS_SECONDARY_LEGACY_RETRIES;
3430
3431         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
3432                                  num_rates, num_retries, valid_tx_ant,
3433                                  toggle_ant);
3434
3435         /* update the color of the LQ command (as a counter at bits 1-3) */
3436         color = LQ_FLAGS_COLOR_INC(LQ_FLAG_COLOR_GET(lq_cmd->flags));
3437         lq_cmd->flags = LQ_FLAG_COLOR_SET(lq_cmd->flags, color);
3438 }
3439
3440 struct rs_bfer_active_iter_data {
3441         struct ieee80211_sta *exclude_sta;
3442         struct iwl_mvm_sta *bfer_mvmsta;
3443 };
3444
3445 static void rs_bfer_active_iter(void *_data,
3446                                 struct ieee80211_sta *sta)
3447 {
3448         struct rs_bfer_active_iter_data *data = _data;
3449         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3450         struct iwl_lq_cmd *lq_cmd = &mvmsta->deflink.lq_sta.rs_drv.lq;
3451         u32 ss_params = le32_to_cpu(lq_cmd->ss_params);
3452
3453         if (sta == data->exclude_sta)
3454                 return;
3455
3456         /* The current sta has BFER allowed */
3457         if (ss_params & LQ_SS_BFER_ALLOWED) {
3458                 WARN_ON_ONCE(data->bfer_mvmsta != NULL);
3459
3460                 data->bfer_mvmsta = mvmsta;
3461         }
3462 }
3463
3464 static int rs_bfer_priority(struct iwl_mvm_sta *sta)
3465 {
3466         int prio = -1;
3467         enum nl80211_iftype viftype = ieee80211_vif_type_p2p(sta->vif);
3468
3469         switch (viftype) {
3470         case NL80211_IFTYPE_AP:
3471         case NL80211_IFTYPE_P2P_GO:
3472                 prio = 3;
3473                 break;
3474         case NL80211_IFTYPE_P2P_CLIENT:
3475                 prio = 2;
3476                 break;
3477         case NL80211_IFTYPE_STATION:
3478                 prio = 1;
3479                 break;
3480         default:
3481                 WARN_ONCE(true, "viftype %d sta_id %d", viftype,
3482                           sta->deflink.sta_id);
3483                 prio = -1;
3484         }
3485
3486         return prio;
3487 }
3488
3489 /* Returns >0 if sta1 has a higher BFER priority compared to sta2 */
3490 static int rs_bfer_priority_cmp(struct iwl_mvm_sta *sta1,
3491                                 struct iwl_mvm_sta *sta2)
3492 {
3493         int prio1 = rs_bfer_priority(sta1);
3494         int prio2 = rs_bfer_priority(sta2);
3495
3496         if (prio1 > prio2)
3497                 return 1;
3498         if (prio1 < prio2)
3499                 return -1;
3500         return 0;
3501 }
3502
3503 static void rs_set_lq_ss_params(struct iwl_mvm *mvm,
3504                                 struct ieee80211_sta *sta,
3505                                 struct iwl_lq_sta *lq_sta,
3506                                 const struct rs_rate *initial_rate)
3507 {
3508         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3509         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
3510         struct rs_bfer_active_iter_data data = {
3511                 .exclude_sta = sta,
3512                 .bfer_mvmsta = NULL,
3513         };
3514         struct iwl_mvm_sta *bfer_mvmsta = NULL;
3515         u32 ss_params = LQ_SS_PARAMS_VALID;
3516
3517         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
3518                 goto out;
3519
3520 #ifdef CONFIG_MAC80211_DEBUGFS
3521         /* Check if forcing the decision is configured.
3522          * Note that SISO is forced by not allowing STBC or BFER
3523          */
3524         if (lq_sta->pers.ss_force == RS_SS_FORCE_STBC)
3525                 ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE);
3526         else if (lq_sta->pers.ss_force == RS_SS_FORCE_BFER)
3527                 ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE);
3528
3529         if (lq_sta->pers.ss_force != RS_SS_FORCE_NONE) {
3530                 IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n",
3531                                lq_sta->pers.ss_force);
3532                 goto out;
3533         }
3534 #endif
3535
3536         if (lq_sta->stbc_capable)
3537                 ss_params |= LQ_SS_STBC_1SS_ALLOWED;
3538
3539         if (!lq_sta->bfer_capable)
3540                 goto out;
3541
3542         ieee80211_iterate_stations_atomic(mvm->hw,
3543                                           rs_bfer_active_iter,
3544                                           &data);
3545         bfer_mvmsta = data.bfer_mvmsta;
3546
3547         /* This code is safe as it doesn't run concurrently for different
3548          * stations. This is guaranteed by the fact that calls to
3549          * ieee80211_tx_status wouldn't run concurrently for a single HW.
3550          */
3551         if (!bfer_mvmsta) {
3552                 IWL_DEBUG_RATE(mvm, "No sta with BFER allowed found. Allow\n");
3553
3554                 ss_params |= LQ_SS_BFER_ALLOWED;
3555                 goto out;
3556         }
3557
3558         IWL_DEBUG_RATE(mvm, "Found existing sta %d with BFER activated\n",
3559                        bfer_mvmsta->deflink.sta_id);
3560
3561         /* Disallow BFER on another STA if active and we're a higher priority */
3562         if (rs_bfer_priority_cmp(mvmsta, bfer_mvmsta) > 0) {
3563                 struct iwl_lq_cmd *bfersta_lq_cmd =
3564                         &bfer_mvmsta->deflink.lq_sta.rs_drv.lq;
3565                 u32 bfersta_ss_params = le32_to_cpu(bfersta_lq_cmd->ss_params);
3566
3567                 bfersta_ss_params &= ~LQ_SS_BFER_ALLOWED;
3568                 bfersta_lq_cmd->ss_params = cpu_to_le32(bfersta_ss_params);
3569                 iwl_mvm_send_lq_cmd(mvm, bfersta_lq_cmd);
3570
3571                 ss_params |= LQ_SS_BFER_ALLOWED;
3572                 IWL_DEBUG_RATE(mvm,
3573                                "Lower priority BFER sta found (%d). Switch BFER\n",
3574                                bfer_mvmsta->deflink.sta_id);
3575         }
3576 out:
3577         lq_cmd->ss_params = cpu_to_le32(ss_params);
3578 }
3579
3580 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
3581                            struct ieee80211_sta *sta,
3582                            struct iwl_lq_sta *lq_sta,
3583                            const struct rs_rate *initial_rate)
3584 {
3585         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
3586         struct iwl_mvm_sta *mvmsta;
3587         struct iwl_mvm_vif *mvmvif;
3588
3589         lq_cmd->agg_disable_start_th = IWL_MVM_RS_AGG_DISABLE_START;
3590         lq_cmd->agg_time_limit =
3591                 cpu_to_le16(IWL_MVM_RS_AGG_TIME_LIMIT);
3592
3593 #ifdef CONFIG_MAC80211_DEBUGFS
3594         if (lq_sta->pers.dbg_fixed_rate) {
3595                 rs_build_rates_table_from_fixed(mvm, lq_cmd,
3596                                                 lq_sta->band,
3597                                                 lq_sta->pers.dbg_fixed_rate);
3598                 return;
3599         }
3600 #endif
3601         if (WARN_ON_ONCE(!sta || !initial_rate))
3602                 return;
3603
3604         rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
3605
3606         if (fw_has_api(&mvm->fw->ucode_capa, IWL_UCODE_TLV_API_LQ_SS_PARAMS))
3607                 rs_set_lq_ss_params(mvm, sta, lq_sta, initial_rate);
3608
3609         mvmsta = iwl_mvm_sta_from_mac80211(sta);
3610         mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
3611
3612         if (!fw_has_capa(&mvm->fw->ucode_capa, IWL_UCODE_TLV_CAPA_COEX_SCHEMA_2) &&
3613             num_of_ant(initial_rate->ant) == 1)
3614                 lq_cmd->single_stream_ant_msk = initial_rate->ant;
3615
3616         lq_cmd->agg_frame_cnt_limit = lq_sta->pers.max_agg_bufsize;
3617
3618         /*
3619          * In case of low latency, tell the firmware to leave a frame in the
3620          * Tx Fifo so that it can start a transaction in the same TxOP. This
3621          * basically allows the firmware to send bursts.
3622          */
3623         if (iwl_mvm_vif_low_latency(mvmvif))
3624                 lq_cmd->agg_frame_cnt_limit--;
3625
3626         if (mvmsta->vif->p2p)
3627                 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
3628
3629         lq_cmd->agg_time_limit =
3630                         cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
3631 }
3632
3633 static void *rs_alloc(struct ieee80211_hw *hw)
3634 {
3635         return hw->priv;
3636 }
3637
3638 /* rate scale requires free function to be implemented */
3639 static void rs_free(void *mvm_rate)
3640 {
3641         return;
3642 }
3643
3644 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta)
3645 {
3646         struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
3647         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3648
3649         IWL_DEBUG_RATE(mvm, "enter\n");
3650         IWL_DEBUG_RATE(mvm, "leave\n");
3651 }
3652
3653 int rs_pretty_print_rate_v1(char *buf, int bufsz, const u32 rate)
3654 {
3655
3656         char *type;
3657         u8 mcs = 0, nss = 0;
3658         u8 ant = (rate & RATE_MCS_ANT_AB_MSK) >> RATE_MCS_ANT_POS;
3659         u32 bw = (rate & RATE_MCS_CHAN_WIDTH_MSK_V1) >>
3660                 RATE_MCS_CHAN_WIDTH_POS;
3661
3662         if (!(rate & RATE_MCS_HT_MSK_V1) &&
3663             !(rate & RATE_MCS_VHT_MSK_V1) &&
3664             !(rate & RATE_MCS_HE_MSK_V1)) {
3665                 int index = iwl_hwrate_to_plcp_idx(rate);
3666
3667                 return scnprintf(buf, bufsz, "Legacy | ANT: %s Rate: %s Mbps",
3668                                  iwl_rs_pretty_ant(ant),
3669                                  index == IWL_RATE_INVALID ? "BAD" :
3670                                  iwl_rate_mcs(index)->mbps);
3671         }
3672
3673         if (rate & RATE_MCS_VHT_MSK_V1) {
3674                 type = "VHT";
3675                 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3676                 nss = FIELD_GET(RATE_MCS_NSS_MSK, rate) + 1;
3677         } else if (rate & RATE_MCS_HT_MSK_V1) {
3678                 type = "HT";
3679                 mcs = rate & RATE_HT_MCS_INDEX_MSK_V1;
3680                 nss = ((rate & RATE_HT_MCS_NSS_MSK_V1)
3681                        >> RATE_HT_MCS_NSS_POS_V1) + 1;
3682         } else if (rate & RATE_MCS_HE_MSK_V1) {
3683                 type = "HE";
3684                 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3685                 nss = FIELD_GET(RATE_MCS_NSS_MSK, rate) + 1;
3686         } else {
3687                 type = "Unknown"; /* shouldn't happen */
3688         }
3689
3690         return scnprintf(buf, bufsz,
3691                          "0x%x: %s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s",
3692                          rate, type, iwl_rs_pretty_ant(ant), iwl_rs_pretty_bw(bw), mcs, nss,
3693                          (rate & RATE_MCS_SGI_MSK_V1) ? "SGI " : "NGI ",
3694                          (rate & RATE_MCS_STBC_MSK) ? "STBC " : "",
3695                          (rate & RATE_MCS_LDPC_MSK_V1) ? "LDPC " : "",
3696                          (rate & RATE_HE_DUAL_CARRIER_MODE_MSK) ? "DCM " : "",
3697                          (rate & RATE_MCS_BF_MSK) ? "BF " : "");
3698 }
3699
3700 #ifdef CONFIG_MAC80211_DEBUGFS
3701 /*
3702  * Program the device to use fixed rate for frame transmit
3703  * This is for debugging/testing only
3704  * once the device start use fixed rate, we need to reload the module
3705  * to being back the normal operation.
3706  */
3707 static void rs_program_fix_rate(struct iwl_mvm *mvm,
3708                                 struct iwl_lq_sta *lq_sta)
3709 {
3710         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
3711         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
3712         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
3713
3714         IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
3715                        lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
3716
3717         if (lq_sta->pers.dbg_fixed_rate) {
3718                 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
3719                 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq);
3720         }
3721 }
3722
3723 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3724                         const char __user *user_buf, size_t count, loff_t *ppos)
3725 {
3726         struct iwl_lq_sta *lq_sta = file->private_data;
3727         struct iwl_mvm *mvm;
3728         char buf[64];
3729         size_t buf_size;
3730         u32 parsed_rate;
3731
3732         mvm = lq_sta->pers.drv;
3733         memset(buf, 0, sizeof(buf));
3734         buf_size = min(count, sizeof(buf) -  1);
3735         if (copy_from_user(buf, user_buf, buf_size))
3736                 return -EFAULT;
3737
3738         if (sscanf(buf, "%x", &parsed_rate) == 1)
3739                 lq_sta->pers.dbg_fixed_rate = parsed_rate;
3740         else
3741                 lq_sta->pers.dbg_fixed_rate = 0;
3742
3743         rs_program_fix_rate(mvm, lq_sta);
3744
3745         return count;
3746 }
3747
3748 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3749                         char __user *user_buf, size_t count, loff_t *ppos)
3750 {
3751         char *buff;
3752         int desc = 0;
3753         int i = 0;
3754         ssize_t ret;
3755         static const size_t bufsz = 2048;
3756
3757         struct iwl_lq_sta *lq_sta = file->private_data;
3758         struct iwl_mvm_sta *mvmsta =
3759                 container_of(lq_sta, struct iwl_mvm_sta, deflink.lq_sta.rs_drv);
3760         struct iwl_mvm *mvm;
3761         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3762         struct rs_rate *rate = &tbl->rate;
3763         u32 ss_params;
3764
3765         mvm = lq_sta->pers.drv;
3766         buff = kmalloc(bufsz, GFP_KERNEL);
3767         if (!buff)
3768                 return -ENOMEM;
3769
3770         desc += scnprintf(buff + desc, bufsz - desc,
3771                           "sta_id %d\n", lq_sta->lq.sta_id);
3772         desc += scnprintf(buff + desc, bufsz - desc,
3773                           "failed=%d success=%d rate=0%lX\n",
3774                           lq_sta->total_failed, lq_sta->total_success,
3775                           lq_sta->active_legacy_rate);
3776         desc += scnprintf(buff + desc, bufsz - desc, "fixed rate 0x%X\n",
3777                           lq_sta->pers.dbg_fixed_rate);
3778         desc += scnprintf(buff + desc, bufsz - desc, "valid_tx_ant %s%s\n",
3779             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_A) ? "ANT_A," : "",
3780             (iwl_mvm_get_valid_tx_ant(mvm) & ANT_B) ? "ANT_B," : "");
3781         desc += scnprintf(buff + desc, bufsz - desc, "lq type %s\n",
3782                           (is_legacy(rate)) ? "legacy" :
3783                           is_vht(rate) ? "VHT" : "HT");
3784         if (!is_legacy(rate)) {
3785                 desc += scnprintf(buff + desc, bufsz - desc, " %s",
3786                    (is_siso(rate)) ? "SISO" : "MIMO2");
3787                 desc += scnprintf(buff + desc, bufsz - desc, " %s",
3788                                 (is_ht20(rate)) ? "20MHz" :
3789                                 (is_ht40(rate)) ? "40MHz" :
3790                                 (is_ht80(rate)) ? "80MHz" :
3791                                 (is_ht160(rate)) ? "160MHz" : "BAD BW");
3792                 desc += scnprintf(buff + desc, bufsz - desc, " %s %s %s %s\n",
3793                                 (rate->sgi) ? "SGI" : "NGI",
3794                                 (rate->ldpc) ? "LDPC" : "BCC",
3795                                 (lq_sta->is_agg) ? "AGG on" : "",
3796                                 (mvmsta->amsdu_enabled) ? "AMSDU on" : "");
3797         }
3798         desc += scnprintf(buff + desc, bufsz - desc, "last tx rate=0x%X\n",
3799                         lq_sta->last_rate_n_flags);
3800         desc += scnprintf(buff + desc, bufsz - desc,
3801                         "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3802                         lq_sta->lq.flags,
3803                         lq_sta->lq.mimo_delim,
3804                         lq_sta->lq.single_stream_ant_msk,
3805                         lq_sta->lq.dual_stream_ant_msk);
3806
3807         desc += scnprintf(buff + desc, bufsz - desc,
3808                         "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3809                         le16_to_cpu(lq_sta->lq.agg_time_limit),
3810                         lq_sta->lq.agg_disable_start_th,
3811                         lq_sta->lq.agg_frame_cnt_limit);
3812
3813         desc += scnprintf(buff + desc, bufsz - desc, "reduced tpc=%d\n",
3814                           lq_sta->lq.reduced_tpc);
3815         ss_params = le32_to_cpu(lq_sta->lq.ss_params);
3816         desc += scnprintf(buff + desc, bufsz - desc,
3817                         "single stream params: %s%s%s%s\n",
3818                         (ss_params & LQ_SS_PARAMS_VALID) ?
3819                         "VALID" : "INVALID",
3820                         (ss_params & LQ_SS_BFER_ALLOWED) ?
3821                         ", BFER" : "",
3822                         (ss_params & LQ_SS_STBC_1SS_ALLOWED) ?
3823                         ", STBC" : "",
3824                         (ss_params & LQ_SS_FORCE) ?
3825                         ", FORCE" : "");
3826         desc += scnprintf(buff + desc, bufsz - desc,
3827                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3828                         lq_sta->lq.initial_rate_index[0],
3829                         lq_sta->lq.initial_rate_index[1],
3830                         lq_sta->lq.initial_rate_index[2],
3831                         lq_sta->lq.initial_rate_index[3]);
3832
3833         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3834                 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3835
3836                 desc += scnprintf(buff + desc, bufsz - desc,
3837                                   " rate[%d] 0x%X ", i, r);
3838                 desc += rs_pretty_print_rate_v1(buff + desc, bufsz - desc, r);
3839                 if (desc < bufsz - 1)
3840                         buff[desc++] = '\n';
3841         }
3842
3843         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3844         kfree(buff);
3845         return ret;
3846 }
3847
3848 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3849         .write = rs_sta_dbgfs_scale_table_write,
3850         .read = rs_sta_dbgfs_scale_table_read,
3851         .open = simple_open,
3852         .llseek = default_llseek,
3853 };
3854 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3855                         char __user *user_buf, size_t count, loff_t *ppos)
3856 {
3857         char *buff;
3858         int desc = 0;
3859         int i, j;
3860         ssize_t ret;
3861         struct iwl_scale_tbl_info *tbl;
3862         struct rs_rate *rate;
3863         struct iwl_lq_sta *lq_sta = file->private_data;
3864
3865         buff = kmalloc(1024, GFP_KERNEL);
3866         if (!buff)
3867                 return -ENOMEM;
3868
3869         for (i = 0; i < LQ_SIZE; i++) {
3870                 tbl = &(lq_sta->lq_info[i]);
3871                 rate = &tbl->rate;
3872                 desc += sprintf(buff+desc,
3873                                 "%s type=%d SGI=%d BW=%s DUP=0\n"
3874                                 "index=%d\n",
3875                                 lq_sta->active_tbl == i ? "*" : "x",
3876                                 rate->type,
3877                                 rate->sgi,
3878                                 is_ht20(rate) ? "20MHz" :
3879                                 is_ht40(rate) ? "40MHz" :
3880                                 is_ht80(rate) ? "80MHz" :
3881                                 is_ht160(rate) ? "160MHz" : "ERR",
3882                                 rate->index);
3883                 for (j = 0; j < IWL_RATE_COUNT; j++) {
3884                         desc += sprintf(buff+desc,
3885                                 "counter=%d success=%d %%=%d\n",
3886                                 tbl->win[j].counter,
3887                                 tbl->win[j].success_counter,
3888                                 tbl->win[j].success_ratio);
3889                 }
3890         }
3891         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3892         kfree(buff);
3893         return ret;
3894 }
3895
3896 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3897         .read = rs_sta_dbgfs_stats_table_read,
3898         .open = simple_open,
3899         .llseek = default_llseek,
3900 };
3901
3902 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3903                                               char __user *user_buf,
3904                                               size_t count, loff_t *ppos)
3905 {
3906         static const char * const column_name[] = {
3907                 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3908                 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3909                 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3910                 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3911                 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3912                 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3913                 [RS_COLUMN_MIMO2] = "MIMO2",
3914                 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3915         };
3916
3917         static const char * const rate_name[] = {
3918                 [IWL_RATE_1M_INDEX] = "1M",
3919                 [IWL_RATE_2M_INDEX] = "2M",
3920                 [IWL_RATE_5M_INDEX] = "5.5M",
3921                 [IWL_RATE_11M_INDEX] = "11M",
3922                 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3923                 [IWL_RATE_9M_INDEX] = "9M",
3924                 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3925                 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3926                 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3927                 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3928                 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3929                 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3930                 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3931                 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3932                 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3933                 [IWL_RATE_MCS_10_INDEX] = "MCS10",
3934                 [IWL_RATE_MCS_11_INDEX] = "MCS11",
3935         };
3936
3937         char *buff, *pos, *endpos;
3938         int col, rate;
3939         ssize_t ret;
3940         struct iwl_lq_sta *lq_sta = file->private_data;
3941         struct rs_rate_stats *stats;
3942         static const size_t bufsz = 1024;
3943
3944         buff = kmalloc(bufsz, GFP_KERNEL);
3945         if (!buff)
3946                 return -ENOMEM;
3947
3948         pos = buff;
3949         endpos = pos + bufsz;
3950
3951         pos += scnprintf(pos, endpos - pos, "COLUMN,");
3952         for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3953                 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3954         pos += scnprintf(pos, endpos - pos, "\n");
3955
3956         for (col = 0; col < RS_COLUMN_COUNT; col++) {
3957                 pos += scnprintf(pos, endpos - pos,
3958                                  "%s,", column_name[col]);
3959
3960                 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
3961                         stats = &(lq_sta->pers.tx_stats[col][rate]);
3962                         pos += scnprintf(pos, endpos - pos,
3963                                          "%llu/%llu,",
3964                                          stats->success,
3965                                          stats->total);
3966                 }
3967                 pos += scnprintf(pos, endpos - pos, "\n");
3968         }
3969
3970         ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3971         kfree(buff);
3972         return ret;
3973 }
3974
3975 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3976                                                const char __user *user_buf,
3977                                                size_t count, loff_t *ppos)
3978 {
3979         struct iwl_lq_sta *lq_sta = file->private_data;
3980         memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
3981
3982         return count;
3983 }
3984
3985 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
3986         .read = rs_sta_dbgfs_drv_tx_stats_read,
3987         .write = rs_sta_dbgfs_drv_tx_stats_write,
3988         .open = simple_open,
3989         .llseek = default_llseek,
3990 };
3991
3992 static ssize_t iwl_dbgfs_ss_force_read(struct file *file,
3993                                        char __user *user_buf,
3994                                        size_t count, loff_t *ppos)
3995 {
3996         struct iwl_lq_sta *lq_sta = file->private_data;
3997         char buf[12];
3998         int bufsz = sizeof(buf);
3999         int pos = 0;
4000         static const char * const ss_force_name[] = {
4001                 [RS_SS_FORCE_NONE] = "none",
4002                 [RS_SS_FORCE_STBC] = "stbc",
4003                 [RS_SS_FORCE_BFER] = "bfer",
4004                 [RS_SS_FORCE_SISO] = "siso",
4005         };
4006
4007         pos += scnprintf(buf+pos, bufsz-pos, "%s\n",
4008                          ss_force_name[lq_sta->pers.ss_force]);
4009         return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
4010 }
4011
4012 static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf,
4013                                         size_t count, loff_t *ppos)
4014 {
4015         struct iwl_mvm *mvm = lq_sta->pers.drv;
4016         int ret = 0;
4017
4018         if (!strncmp("none", buf, 4)) {
4019                 lq_sta->pers.ss_force = RS_SS_FORCE_NONE;
4020         } else if (!strncmp("siso", buf, 4)) {
4021                 lq_sta->pers.ss_force = RS_SS_FORCE_SISO;
4022         } else if (!strncmp("stbc", buf, 4)) {
4023                 if (lq_sta->stbc_capable) {
4024                         lq_sta->pers.ss_force = RS_SS_FORCE_STBC;
4025                 } else {
4026                         IWL_ERR(mvm,
4027                                 "can't force STBC. peer doesn't support\n");
4028                         ret = -EINVAL;
4029                 }
4030         } else if (!strncmp("bfer", buf, 4)) {
4031                 if (lq_sta->bfer_capable) {
4032                         lq_sta->pers.ss_force = RS_SS_FORCE_BFER;
4033                 } else {
4034                         IWL_ERR(mvm,
4035                                 "can't force BFER. peer doesn't support\n");
4036                         ret = -EINVAL;
4037                 }
4038         } else {
4039                 IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n");
4040                 ret = -EINVAL;
4041         }
4042         return ret ?: count;
4043 }
4044
4045 #define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
4046         _MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta)
4047 #define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do {                \
4048                 debugfs_create_file(#name, mode, parent, lq_sta,        \
4049                                     &iwl_dbgfs_##name##_ops);           \
4050         } while (0)
4051
4052 MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32);
4053
4054 static void rs_drv_add_sta_debugfs(void *mvm, void *priv_sta,
4055                                    struct dentry *dir)
4056 {
4057         struct iwl_lq_sta *lq_sta = priv_sta;
4058         struct iwl_mvm_sta *mvmsta;
4059
4060         mvmsta = container_of(lq_sta, struct iwl_mvm_sta,
4061                               deflink.lq_sta.rs_drv);
4062
4063         if (!mvmsta->vif)
4064                 return;
4065
4066         debugfs_create_file("rate_scale_table", 0600, dir,
4067                             lq_sta, &rs_sta_dbgfs_scale_table_ops);
4068         debugfs_create_file("rate_stats_table", 0400, dir,
4069                             lq_sta, &rs_sta_dbgfs_stats_table_ops);
4070         debugfs_create_file("drv_tx_stats", 0600, dir,
4071                             lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
4072         debugfs_create_u8("tx_agg_tid_enable", 0600, dir,
4073                           &lq_sta->tx_agg_tid_en);
4074         debugfs_create_u8("reduced_tpc", 0600, dir,
4075                           &lq_sta->pers.dbg_fixed_txp_reduction);
4076
4077         MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, 0600);
4078 }
4079 #endif
4080
4081 /*
4082  * Initialization of rate scaling information is done by driver after
4083  * the station is added. Since mac80211 calls this function before a
4084  * station is added we ignore it.
4085  */
4086 static void rs_rate_init_ops(void *mvm_r,
4087                              struct ieee80211_supported_band *sband,
4088                              struct cfg80211_chan_def *chandef,
4089                              struct ieee80211_sta *sta, void *mvm_sta)
4090 {
4091 }
4092
4093 /* ops for rate scaling implemented in the driver */
4094 static const struct rate_control_ops rs_mvm_ops_drv = {
4095         .name = RS_NAME,
4096         .tx_status = rs_drv_mac80211_tx_status,
4097         .get_rate = rs_drv_get_rate,
4098         .rate_init = rs_rate_init_ops,
4099         .alloc = rs_alloc,
4100         .free = rs_free,
4101         .alloc_sta = rs_drv_alloc_sta,
4102         .free_sta = rs_free_sta,
4103         .rate_update = rs_drv_rate_update,
4104 #ifdef CONFIG_MAC80211_DEBUGFS
4105         .add_sta_debugfs = rs_drv_add_sta_debugfs,
4106 #endif
4107         .capa = RATE_CTRL_CAPA_VHT_EXT_NSS_BW,
4108 };
4109
4110 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm,
4111                           struct ieee80211_vif *vif,
4112                           struct ieee80211_sta *sta,
4113                           struct ieee80211_bss_conf *link_conf,
4114                           struct ieee80211_link_sta *link_sta,
4115                           enum nl80211_band band)
4116 {
4117         if (iwl_mvm_has_tlc_offload(mvm)) {
4118                 iwl_mvm_rs_fw_rate_init(mvm, vif, sta, link_conf,
4119                                         link_sta, band);
4120         } else {
4121                 struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
4122
4123                 spin_lock_bh(&mvmsta->deflink.lq_sta.rs_drv.pers.lock);
4124                 rs_drv_rate_init(mvm, sta, band);
4125                 spin_unlock_bh(&mvmsta->deflink.lq_sta.rs_drv.pers.lock);
4126         }
4127 }
4128
4129 int iwl_mvm_rate_control_register(void)
4130 {
4131         return ieee80211_rate_control_register(&rs_mvm_ops_drv);
4132 }
4133
4134 void iwl_mvm_rate_control_unregister(void)
4135 {
4136         ieee80211_rate_control_unregister(&rs_mvm_ops_drv);
4137 }
4138
4139 static int rs_drv_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
4140                                 bool enable)
4141 {
4142         struct iwl_lq_cmd *lq = &mvmsta->deflink.lq_sta.rs_drv.lq;
4143
4144         lockdep_assert_held(&mvm->mutex);
4145
4146         if (enable) {
4147                 if (mvmsta->tx_protection == 0)
4148                         lq->flags |= LQ_FLAG_USE_RTS_MSK;
4149                 mvmsta->tx_protection++;
4150         } else {
4151                 mvmsta->tx_protection--;
4152                 if (mvmsta->tx_protection == 0)
4153                         lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
4154         }
4155
4156         return iwl_mvm_send_lq_cmd(mvm, lq);
4157 }
4158
4159 /**
4160  * iwl_mvm_tx_protection - ask FW to enable RTS/CTS protection
4161  * @mvm: The mvm component
4162  * @mvmsta: The station
4163  * @enable: Enable Tx protection?
4164  *
4165  * Returns: an error code
4166  */
4167 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
4168                           bool enable)
4169 {
4170         if (iwl_mvm_has_tlc_offload(mvm))
4171                 return rs_fw_tx_protection(mvm, mvmsta, enable);
4172         else
4173                 return rs_drv_tx_protection(mvm, mvmsta, enable);
4174 }